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1 281 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                         GNAT COMPILER COMPONENTS                         --
4
--                                                                          --
5
--                             S E M _ P R A G                              --
6
--                                                                          --
7
--                                 B o d y                                  --
8
--                                                                          --
9
--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
10
--                                                                          --
11
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12
-- terms of the  GNU General Public License as published  by the Free Soft- --
13
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
17
-- for  more details.  You should have  received  a copy of the GNU General --
18
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
19
-- http://www.gnu.org/licenses for a complete copy of the license.          --
20
--                                                                          --
21
-- GNAT was originally developed  by the GNAT team at  New York University. --
22
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
23
--                                                                          --
24
------------------------------------------------------------------------------
25
 
26
--  This unit contains the semantic processing for all pragmas, both language
27
--  and implementation defined. For most pragmas, the parser only does the
28
--  most basic job of checking the syntax, so Sem_Prag also contains the code
29
--  to complete the syntax checks. Certain pragmas are handled partially or
30
--  completely by the parser (see Par.Prag for further details).
31
 
32
with Atree;    use Atree;
33
with Casing;   use Casing;
34
with Checks;   use Checks;
35
with Csets;    use Csets;
36
with Debug;    use Debug;
37
with Einfo;    use Einfo;
38
with Elists;   use Elists;
39
with Errout;   use Errout;
40
with Exp_Dist; use Exp_Dist;
41
with Lib;      use Lib;
42
with Lib.Writ; use Lib.Writ;
43
with Lib.Xref; use Lib.Xref;
44
with Namet.Sp; use Namet.Sp;
45
with Nlists;   use Nlists;
46
with Nmake;    use Nmake;
47
with Opt;      use Opt;
48
with Output;   use Output;
49
with Restrict; use Restrict;
50
with Rident;   use Rident;
51
with Rtsfind;  use Rtsfind;
52
with Sem;      use Sem;
53
with Sem_Aux;  use Sem_Aux;
54
with Sem_Ch3;  use Sem_Ch3;
55
with Sem_Ch6;  use Sem_Ch6;
56
with Sem_Ch8;  use Sem_Ch8;
57
with Sem_Ch12; use Sem_Ch12;
58
with Sem_Ch13; use Sem_Ch13;
59
with Sem_Dist; use Sem_Dist;
60
with Sem_Elim; use Sem_Elim;
61
with Sem_Eval; use Sem_Eval;
62
with Sem_Intr; use Sem_Intr;
63
with Sem_Mech; use Sem_Mech;
64
with Sem_Res;  use Sem_Res;
65
with Sem_Type; use Sem_Type;
66
with Sem_Util; use Sem_Util;
67
with Sem_VFpt; use Sem_VFpt;
68
with Sem_Warn; use Sem_Warn;
69
with Stand;    use Stand;
70
with Sinfo;    use Sinfo;
71
with Sinfo.CN; use Sinfo.CN;
72
with Sinput;   use Sinput;
73
with Snames;   use Snames;
74
with Stringt;  use Stringt;
75
with Stylesw;  use Stylesw;
76
with Table;
77
with Targparm; use Targparm;
78
with Tbuild;   use Tbuild;
79
with Ttypes;
80
with Uintp;    use Uintp;
81
with Uname;    use Uname;
82
with Urealp;   use Urealp;
83
with Validsw;  use Validsw;
84
 
85
package body Sem_Prag is
86
 
87
   ----------------------------------------------
88
   -- Common Handling of Import-Export Pragmas --
89
   ----------------------------------------------
90
 
91
   --  In the following section, a number of Import_xxx and Export_xxx
92
   --  pragmas are defined by GNAT. These are compatible with the DEC
93
   --  pragmas of the same name, and all have the following common
94
   --  form and processing:
95
 
96
   --  pragma Export_xxx
97
   --        [Internal                 =>] LOCAL_NAME
98
   --     [, [External                 =>] EXTERNAL_SYMBOL]
99
   --     [, other optional parameters   ]);
100
 
101
   --  pragma Import_xxx
102
   --        [Internal                 =>] LOCAL_NAME
103
   --     [, [External                 =>] EXTERNAL_SYMBOL]
104
   --     [, other optional parameters   ]);
105
 
106
   --   EXTERNAL_SYMBOL ::=
107
   --     IDENTIFIER
108
   --   | static_string_EXPRESSION
109
 
110
   --  The internal LOCAL_NAME designates the entity that is imported or
111
   --  exported, and must refer to an entity in the current declarative
112
   --  part (as required by the rules for LOCAL_NAME).
113
 
114
   --  The external linker name is designated by the External parameter if
115
   --  given, or the Internal parameter if not (if there is no External
116
   --  parameter, the External parameter is a copy of the Internal name).
117
 
118
   --  If the External parameter is given as a string, then this string is
119
   --  treated as an external name (exactly as though it had been given as an
120
   --  External_Name parameter for a normal Import pragma).
121
 
122
   --  If the External parameter is given as an identifier (or there is no
123
   --  External parameter, so that the Internal identifier is used), then
124
   --  the external name is the characters of the identifier, translated
125
   --  to all upper case letters for OpenVMS versions of GNAT, and to all
126
   --  lower case letters for all other versions
127
 
128
   --  Note: the external name specified or implied by any of these special
129
   --  Import_xxx or Export_xxx pragmas override an external or link name
130
   --  specified in a previous Import or Export pragma.
131
 
132
   --  Note: these and all other DEC-compatible GNAT pragmas allow full use of
133
   --  named notation, following the standard rules for subprogram calls, i.e.
134
   --  parameters can be given in any order if named notation is used, and
135
   --  positional and named notation can be mixed, subject to the rule that all
136
   --  positional parameters must appear first.
137
 
138
   --  Note: All these pragmas are implemented exactly following the DEC design
139
   --  and implementation and are intended to be fully compatible with the use
140
   --  of these pragmas in the DEC Ada compiler.
141
 
142
   --------------------------------------------
143
   -- Checking for Duplicated External Names --
144
   --------------------------------------------
145
 
146
   --  It is suspicious if two separate Export pragmas use the same external
147
   --  name. The following table is used to diagnose this situation so that
148
   --  an appropriate warning can be issued.
149
 
150
   --  The Node_Id stored is for the N_String_Literal node created to hold
151
   --  the value of the external name. The Sloc of this node is used to
152
   --  cross-reference the location of the duplication.
153
 
154
   package Externals is new Table.Table (
155
     Table_Component_Type => Node_Id,
156
     Table_Index_Type     => Int,
157
     Table_Low_Bound      => 0,
158
     Table_Initial        => 100,
159
     Table_Increment      => 100,
160
     Table_Name           => "Name_Externals");
161
 
162
   -------------------------------------
163
   -- Local Subprograms and Variables --
164
   -------------------------------------
165
 
166
   function Adjust_External_Name_Case (N : Node_Id) return Node_Id;
167
   --  This routine is used for possible casing adjustment of an explicit
168
   --  external name supplied as a string literal (the node N), according to
169
   --  the casing requirement of Opt.External_Name_Casing. If this is set to
170
   --  As_Is, then the string literal is returned unchanged, but if it is set
171
   --  to Uppercase or Lowercase, then a new string literal with appropriate
172
   --  casing is constructed.
173
 
174
   function Get_Base_Subprogram (Def_Id : Entity_Id) return Entity_Id;
175
   --  If Def_Id refers to a renamed subprogram, then the base subprogram (the
176
   --  original one, following the renaming chain) is returned. Otherwise the
177
   --  entity is returned unchanged. Should be in Einfo???
178
 
179
   function Get_Pragma_Arg (Arg : Node_Id) return Node_Id;
180
   --  All the routines that check pragma arguments take either a pragma
181
   --  argument association (in which case the expression of the argument
182
   --  association is checked), or the expression directly. The function
183
   --  Get_Pragma_Arg is a utility used to deal with these two cases. If Arg
184
   --  is a pragma argument association node, then its expression is returned,
185
   --  otherwise Arg is returned unchanged.
186
 
187
   procedure rv;
188
   --  This is a dummy function called by the processing for pragma Reviewable.
189
   --  It is there for assisting front end debugging. By placing a Reviewable
190
   --  pragma in the source program, a breakpoint on rv catches this place in
191
   --  the source, allowing convenient stepping to the point of interest.
192
 
193
   procedure Set_Unit_Name (N : Node_Id; With_Item : Node_Id);
194
   --  Place semantic information on the argument of an Elaborate/Elaborate_All
195
   --  pragma. Entity name for unit and its parents is taken from item in
196
   --  previous with_clause that mentions the unit.
197
 
198
   -------------------------------
199
   -- Adjust_External_Name_Case --
200
   -------------------------------
201
 
202
   function Adjust_External_Name_Case (N : Node_Id) return Node_Id is
203
      CC : Char_Code;
204
 
205
   begin
206
      --  Adjust case of literal if required
207
 
208
      if Opt.External_Name_Exp_Casing = As_Is then
209
         return N;
210
 
211
      else
212
         --  Copy existing string
213
 
214
         Start_String;
215
 
216
         --  Set proper casing
217
 
218
         for J in 1 .. String_Length (Strval (N)) loop
219
            CC := Get_String_Char (Strval (N), J);
220
 
221
            if Opt.External_Name_Exp_Casing = Uppercase
222
              and then CC >= Get_Char_Code ('a')
223
              and then CC <= Get_Char_Code ('z')
224
            then
225
               Store_String_Char (CC - 32);
226
 
227
            elsif Opt.External_Name_Exp_Casing = Lowercase
228
              and then CC >= Get_Char_Code ('A')
229
              and then CC <= Get_Char_Code ('Z')
230
            then
231
               Store_String_Char (CC + 32);
232
 
233
            else
234
               Store_String_Char (CC);
235
            end if;
236
         end loop;
237
 
238
         return
239
           Make_String_Literal (Sloc (N),
240
             Strval => End_String);
241
      end if;
242
   end Adjust_External_Name_Case;
243
 
244
   ------------------------------
245
   -- Analyze_PPC_In_Decl_Part --
246
   ------------------------------
247
 
248
   procedure Analyze_PPC_In_Decl_Part (N : Node_Id; S : Entity_Id) is
249
      Arg1 : constant Node_Id :=
250
               First (Pragma_Argument_Associations (N));
251
      Arg2 : constant Node_Id := Next (Arg1);
252
 
253
   begin
254
      --  Install formals and push subprogram spec onto scope stack so that we
255
      --  can see the formals from the pragma.
256
 
257
      Install_Formals (S);
258
      Push_Scope (S);
259
 
260
      --  Preanalyze the boolean expression, we treat this as a spec expression
261
      --  (i.e. similar to a default expression).
262
 
263
      Preanalyze_Spec_Expression
264
        (Get_Pragma_Arg (Arg1), Standard_Boolean);
265
 
266
      --  If there is a message argument, analyze it the same way
267
 
268
      if Present (Arg2) then
269
         Preanalyze_Spec_Expression
270
           (Get_Pragma_Arg (Arg2), Standard_String);
271
      end if;
272
 
273
      --  Remove the subprogram from the scope stack now that the pre-analysis
274
      --  of the precondition/postcondition is done.
275
 
276
      End_Scope;
277
   end Analyze_PPC_In_Decl_Part;
278
 
279
   --------------------
280
   -- Analyze_Pragma --
281
   --------------------
282
 
283
   procedure Analyze_Pragma (N : Node_Id) is
284
      Loc     : constant Source_Ptr := Sloc (N);
285
      Pname   : constant Name_Id    := Pragma_Name (N);
286
      Prag_Id : Pragma_Id;
287
 
288
      Pragma_Exit : exception;
289
      --  This exception is used to exit pragma processing completely. It is
290
      --  used when an error is detected, and no further processing is
291
      --  required. It is also used if an earlier error has left the tree in
292
      --  a state where the pragma should not be processed.
293
 
294
      Arg_Count : Nat;
295
      --  Number of pragma argument associations
296
 
297
      Arg1 : Node_Id;
298
      Arg2 : Node_Id;
299
      Arg3 : Node_Id;
300
      Arg4 : Node_Id;
301
      --  First four pragma arguments (pragma argument association nodes, or
302
      --  Empty if the corresponding argument does not exist).
303
 
304
      type Name_List is array (Natural range <>) of Name_Id;
305
      type Args_List is array (Natural range <>) of Node_Id;
306
      --  Types used for arguments to Check_Arg_Order and Gather_Associations
307
 
308
      procedure Ada_2005_Pragma;
309
      --  Called for pragmas defined in Ada 2005, that are not in Ada 95. In
310
      --  Ada 95 mode, these are implementation defined pragmas, so should be
311
      --  caught by the No_Implementation_Pragmas restriction
312
 
313
      procedure Check_Ada_83_Warning;
314
      --  Issues a warning message for the current pragma if operating in Ada
315
      --  83 mode (used for language pragmas that are not a standard part of
316
      --  Ada 83). This procedure does not raise Error_Pragma. Also notes use
317
      --  of 95 pragma.
318
 
319
      procedure Check_Arg_Count (Required : Nat);
320
      --  Check argument count for pragma is equal to given parameter. If not,
321
      --  then issue an error message and raise Pragma_Exit.
322
 
323
      --  Note: all routines whose name is Check_Arg_Is_xxx take an argument
324
      --  Arg which can either be a pragma argument association, in which case
325
      --  the check is applied to the expression of the association or an
326
      --  expression directly.
327
 
328
      procedure Check_Arg_Is_External_Name (Arg : Node_Id);
329
      --  Check that an argument has the right form for an EXTERNAL_NAME
330
      --  parameter of an extended import/export pragma. The rule is that the
331
      --  name must be an identifier or string literal (in Ada 83 mode) or a
332
      --  static string expression (in Ada 95 mode).
333
 
334
      procedure Check_Arg_Is_Identifier (Arg : Node_Id);
335
      --  Check the specified argument Arg to make sure that it is an
336
      --  identifier. If not give error and raise Pragma_Exit.
337
 
338
      procedure Check_Arg_Is_Integer_Literal (Arg : Node_Id);
339
      --  Check the specified argument Arg to make sure that it is an integer
340
      --  literal. If not give error and raise Pragma_Exit.
341
 
342
      procedure Check_Arg_Is_Library_Level_Local_Name (Arg : Node_Id);
343
      --  Check the specified argument Arg to make sure that it has the proper
344
      --  syntactic form for a local name and meets the semantic requirements
345
      --  for a local name. The local name is analyzed as part of the
346
      --  processing for this call. In addition, the local name is required
347
      --  to represent an entity at the library level.
348
 
349
      procedure Check_Arg_Is_Local_Name (Arg : Node_Id);
350
      --  Check the specified argument Arg to make sure that it has the proper
351
      --  syntactic form for a local name and meets the semantic requirements
352
      --  for a local name. The local name is analyzed as part of the
353
      --  processing for this call.
354
 
355
      procedure Check_Arg_Is_Locking_Policy (Arg : Node_Id);
356
      --  Check the specified argument Arg to make sure that it is a valid
357
      --  locking policy name. If not give error and raise Pragma_Exit.
358
 
359
      procedure Check_Arg_Is_One_Of (Arg : Node_Id; N1, N2 : Name_Id);
360
      procedure Check_Arg_Is_One_Of (Arg : Node_Id; N1, N2, N3 : Name_Id);
361
      procedure Check_Arg_Is_One_Of (Arg : Node_Id; N1, N2, N3, N4 : Name_Id);
362
      --  Check the specified argument Arg to make sure that it is an
363
      --  identifier whose name matches either N1 or N2 (or N3 if present).
364
      --  If not then give error and raise Pragma_Exit.
365
 
366
      procedure Check_Arg_Is_Queuing_Policy (Arg : Node_Id);
367
      --  Check the specified argument Arg to make sure that it is a valid
368
      --  queuing policy name. If not give error and raise Pragma_Exit.
369
 
370
      procedure Check_Arg_Is_Static_Expression
371
        (Arg : Node_Id;
372
         Typ : Entity_Id := Empty);
373
      --  Check the specified argument Arg to make sure that it is a static
374
      --  expression of the given type (i.e. it will be analyzed and resolved
375
      --  using this type, which can be any valid argument to Resolve, e.g.
376
      --  Any_Integer is OK). If not, given error and raise Pragma_Exit. If
377
      --  Typ is left Empty, then any static expression is allowed.
378
 
379
      procedure Check_Arg_Is_String_Literal (Arg : Node_Id);
380
      --  Check the specified argument Arg to make sure that it is a string
381
      --  literal. If not give error and raise Pragma_Exit
382
 
383
      procedure Check_Arg_Is_Task_Dispatching_Policy (Arg : Node_Id);
384
      --  Check the specified argument Arg to make sure that it is a valid task
385
      --  dispatching policy name. If not give error and raise Pragma_Exit.
386
 
387
      procedure Check_Arg_Order (Names : Name_List);
388
      --  Checks for an instance of two arguments with identifiers for the
389
      --  current pragma which are not in the sequence indicated by Names,
390
      --  and if so, generates a fatal message about bad order of arguments.
391
 
392
      procedure Check_At_Least_N_Arguments (N : Nat);
393
      --  Check there are at least N arguments present
394
 
395
      procedure Check_At_Most_N_Arguments (N : Nat);
396
      --  Check there are no more than N arguments present
397
 
398
      procedure Check_Component (Comp : Node_Id);
399
      --  Examine Unchecked_Union component for correct use of per-object
400
      --  constrained subtypes, and for restrictions on finalizable components.
401
 
402
      procedure Check_Duplicated_Export_Name (Nam : Node_Id);
403
      --  Nam is an N_String_Literal node containing the external name set by
404
      --  an Import or Export pragma (or extended Import or Export pragma).
405
      --  This procedure checks for possible duplications if this is the export
406
      --  case, and if found, issues an appropriate error message.
407
 
408
      procedure Check_First_Subtype (Arg : Node_Id);
409
      --  Checks that Arg, whose expression is an entity name referencing a
410
      --  subtype, does not reference a type that is not a first subtype.
411
 
412
      procedure Check_In_Main_Program;
413
      --  Common checks for pragmas that appear within a main program
414
      --  (Priority, Main_Storage, Time_Slice, Relative_Deadline).
415
 
416
      procedure Check_Interrupt_Or_Attach_Handler;
417
      --  Common processing for first argument of pragma Interrupt_Handler or
418
      --  pragma Attach_Handler.
419
 
420
      procedure Check_Is_In_Decl_Part_Or_Package_Spec;
421
      --  Check that pragma appears in a declarative part, or in a package
422
      --  specification, i.e. that it does not occur in a statement sequence
423
      --  in a body.
424
 
425
      procedure Check_No_Identifier (Arg : Node_Id);
426
      --  Checks that the given argument does not have an identifier. If
427
      --  an identifier is present, then an error message is issued, and
428
      --  Pragma_Exit is raised.
429
 
430
      procedure Check_No_Identifiers;
431
      --  Checks that none of the arguments to the pragma has an identifier.
432
      --  If any argument has an identifier, then an error message is issued,
433
      --  and Pragma_Exit is raised.
434
 
435
      procedure Check_Optional_Identifier (Arg : Node_Id; Id : Name_Id);
436
      --  Checks if the given argument has an identifier, and if so, requires
437
      --  it to match the given identifier name. If there is a non-matching
438
      --  identifier, then an error message is given and Error_Pragmas raised.
439
 
440
      procedure Check_Optional_Identifier (Arg : Node_Id; Id : String);
441
      --  Checks if the given argument has an identifier, and if so, requires
442
      --  it to match the given identifier name. If there is a non-matching
443
      --  identifier, then an error message is given and Error_Pragmas raised.
444
      --  In this version of the procedure, the identifier name is given as
445
      --  a string with lower case letters.
446
 
447
      procedure Check_Precondition_Postcondition (In_Body : out Boolean);
448
      --  Called to process a precondition or postcondition pragma. There are
449
      --  three cases:
450
      --
451
      --    The pragma appears after a subprogram spec
452
      --
453
      --      If the corresponding check is not enabled, the pragma is analyzed
454
      --      but otherwise ignored and control returns with In_Body set False.
455
      --
456
      --      If the check is enabled, then the first step is to analyze the
457
      --      pragma, but this is skipped if the subprogram spec appears within
458
      --      a package specification (because this is the case where we delay
459
      --      analysis till the end of the spec). Then (whether or not it was
460
      --      analyzed), the pragma is chained to the subprogram in question
461
      --      (using Spec_PPC_List and Next_Pragma) and control returns to the
462
      --      caller with In_Body set False.
463
      --
464
      --    The pragma appears at the start of subprogram body declarations
465
      --
466
      --      In this case an immediate return to the caller is made with
467
      --      In_Body set True, and the pragma is NOT analyzed.
468
      --
469
      --    In all other cases, an error message for bad placement is given
470
 
471
      procedure Check_Static_Constraint (Constr : Node_Id);
472
      --  Constr is a constraint from an N_Subtype_Indication node from a
473
      --  component constraint in an Unchecked_Union type. This routine checks
474
      --  that the constraint is static as required by the restrictions for
475
      --  Unchecked_Union.
476
 
477
      procedure Check_Valid_Configuration_Pragma;
478
      --  Legality checks for placement of a configuration pragma
479
 
480
      procedure Check_Valid_Library_Unit_Pragma;
481
      --  Legality checks for library unit pragmas. A special case arises for
482
      --  pragmas in generic instances that come from copies of the original
483
      --  library unit pragmas in the generic templates. In the case of other
484
      --  than library level instantiations these can appear in contexts which
485
      --  would normally be invalid (they only apply to the original template
486
      --  and to library level instantiations), and they are simply ignored,
487
      --  which is implemented by rewriting them as null statements.
488
 
489
      procedure Check_Variant (Variant : Node_Id);
490
      --  Check Unchecked_Union variant for lack of nested variants and
491
      --  presence of at least one component.
492
 
493
      procedure Error_Pragma (Msg : String);
494
      pragma No_Return (Error_Pragma);
495
      --  Outputs error message for current pragma. The message contains a %
496
      --  that will be replaced with the pragma name, and the flag is placed
497
      --  on the pragma itself. Pragma_Exit is then raised.
498
 
499
      procedure Error_Pragma_Arg (Msg : String; Arg : Node_Id);
500
      pragma No_Return (Error_Pragma_Arg);
501
      --  Outputs error message for current pragma. The message may contain
502
      --  a % that will be replaced with the pragma name. The parameter Arg
503
      --  may either be a pragma argument association, in which case the flag
504
      --  is placed on the expression of this association, or an expression,
505
      --  in which case the flag is placed directly on the expression. The
506
      --  message is placed using Error_Msg_N, so the message may also contain
507
      --  an & insertion character which will reference the given Arg value.
508
      --  After placing the message, Pragma_Exit is raised.
509
 
510
      procedure Error_Pragma_Arg (Msg1, Msg2 : String; Arg : Node_Id);
511
      pragma No_Return (Error_Pragma_Arg);
512
      --  Similar to above form of Error_Pragma_Arg except that two messages
513
      --  are provided, the second is a continuation comment starting with \.
514
 
515
      procedure Error_Pragma_Arg_Ident (Msg : String; Arg : Node_Id);
516
      pragma No_Return (Error_Pragma_Arg_Ident);
517
      --  Outputs error message for current pragma. The message may contain
518
      --  a % that will be replaced with the pragma name. The parameter Arg
519
      --  must be a pragma argument association with a non-empty identifier
520
      --  (i.e. its Chars field must be set), and the error message is placed
521
      --  on the identifier. The message is placed using Error_Msg_N so
522
      --  the message may also contain an & insertion character which will
523
      --  reference the identifier. After placing the message, Pragma_Exit
524
      --  is raised.
525
 
526
      procedure Error_Pragma_Ref (Msg : String; Ref : Entity_Id);
527
      pragma No_Return (Error_Pragma_Ref);
528
      --  Outputs error message for current pragma. The message may contain
529
      --  a % that will be replaced with the pragma name. The parameter Ref
530
      --  must be an entity whose name can be referenced by & and sloc by #.
531
      --  After placing the message, Pragma_Exit is raised.
532
 
533
      function Find_Lib_Unit_Name return Entity_Id;
534
      --  Used for a library unit pragma to find the entity to which the
535
      --  library unit pragma applies, returns the entity found.
536
 
537
      procedure Find_Program_Unit_Name (Id : Node_Id);
538
      --  If the pragma is a compilation unit pragma, the id must denote the
539
      --  compilation unit in the same compilation, and the pragma must appear
540
      --  in the list of preceding or trailing pragmas. If it is a program
541
      --  unit pragma that is not a compilation unit pragma, then the
542
      --  identifier must be visible.
543
 
544
      function Find_Unique_Parameterless_Procedure
545
        (Name : Entity_Id;
546
         Arg  : Node_Id) return Entity_Id;
547
      --  Used for a procedure pragma to find the unique parameterless
548
      --  procedure identified by Name, returns it if it exists, otherwise
549
      --  errors out and uses Arg as the pragma argument for the message.
550
 
551
      procedure Gather_Associations
552
        (Names : Name_List;
553
         Args  : out Args_List);
554
      --  This procedure is used to gather the arguments for a pragma that
555
      --  permits arbitrary ordering of parameters using the normal rules
556
      --  for named and positional parameters. The Names argument is a list
557
      --  of Name_Id values that corresponds to the allowed pragma argument
558
      --  association identifiers in order. The result returned in Args is
559
      --  a list of corresponding expressions that are the pragma arguments.
560
      --  Note that this is a list of expressions, not of pragma argument
561
      --  associations (Gather_Associations has completely checked all the
562
      --  optional identifiers when it returns). An entry in Args is Empty
563
      --  on return if the corresponding argument is not present.
564
 
565
      procedure GNAT_Pragma;
566
      --  Called for all GNAT defined pragmas to check the relevant restriction
567
      --  (No_Implementation_Pragmas).
568
 
569
      function Is_Before_First_Decl
570
        (Pragma_Node : Node_Id;
571
         Decls       : List_Id) return Boolean;
572
      --  Return True if Pragma_Node is before the first declarative item in
573
      --  Decls where Decls is the list of declarative items.
574
 
575
      function Is_Configuration_Pragma return Boolean;
576
      --  Determines if the placement of the current pragma is appropriate
577
      --  for a configuration pragma.
578
 
579
      function Is_In_Context_Clause return Boolean;
580
      --  Returns True if pragma appears within the context clause of a unit,
581
      --  and False for any other placement (does not generate any messages).
582
 
583
      function Is_Static_String_Expression (Arg : Node_Id) return Boolean;
584
      --  Analyzes the argument, and determines if it is a static string
585
      --  expression, returns True if so, False if non-static or not String.
586
 
587
      procedure Pragma_Misplaced;
588
      pragma No_Return (Pragma_Misplaced);
589
      --  Issue fatal error message for misplaced pragma
590
 
591
      procedure Process_Atomic_Shared_Volatile;
592
      --  Common processing for pragmas Atomic, Shared, Volatile. Note that
593
      --  Shared is an obsolete Ada 83 pragma, treated as being identical
594
      --  in effect to pragma Atomic.
595
 
596
      procedure Process_Compile_Time_Warning_Or_Error;
597
      --  Common processing for Compile_Time_Error and Compile_Time_Warning
598
 
599
      procedure Process_Convention
600
        (C   : out Convention_Id;
601
         Ent : out Entity_Id);
602
      --  Common processing for Convention, Interface, Import and Export.
603
      --  Checks first two arguments of pragma, and sets the appropriate
604
      --  convention value in the specified entity or entities. On return
605
      --  C is the convention, Ent is the referenced entity.
606
 
607
      procedure Process_Extended_Import_Export_Exception_Pragma
608
        (Arg_Internal : Node_Id;
609
         Arg_External : Node_Id;
610
         Arg_Form     : Node_Id;
611
         Arg_Code     : Node_Id);
612
      --  Common processing for the pragmas Import/Export_Exception. The three
613
      --  arguments correspond to the three named parameters of the pragma. An
614
      --  argument is empty if the corresponding parameter is not present in
615
      --  the pragma.
616
 
617
      procedure Process_Extended_Import_Export_Object_Pragma
618
        (Arg_Internal : Node_Id;
619
         Arg_External : Node_Id;
620
         Arg_Size     : Node_Id);
621
      --  Common processing for the pragmas Import/Export_Object. The three
622
      --  arguments correspond to the three named parameters of the pragmas. An
623
      --  argument is empty if the corresponding parameter is not present in
624
      --  the pragma.
625
 
626
      procedure Process_Extended_Import_Export_Internal_Arg
627
        (Arg_Internal : Node_Id := Empty);
628
      --  Common processing for all extended Import and Export pragmas. The
629
      --  argument is the pragma parameter for the Internal argument. If
630
      --  Arg_Internal is empty or inappropriate, an error message is posted.
631
      --  Otherwise, on normal return, the Entity_Field of Arg_Internal is
632
      --  set to identify the referenced entity.
633
 
634
      procedure Process_Extended_Import_Export_Subprogram_Pragma
635
        (Arg_Internal                 : Node_Id;
636
         Arg_External                 : Node_Id;
637
         Arg_Parameter_Types          : Node_Id;
638
         Arg_Result_Type              : Node_Id := Empty;
639
         Arg_Mechanism                : Node_Id;
640
         Arg_Result_Mechanism         : Node_Id := Empty;
641
         Arg_First_Optional_Parameter : Node_Id := Empty);
642
      --  Common processing for all extended Import and Export pragmas applying
643
      --  to subprograms. The caller omits any arguments that do not apply to
644
      --  the pragma in question (for example, Arg_Result_Type can be non-Empty
645
      --  only in the Import_Function and Export_Function cases). The argument
646
      --  names correspond to the allowed pragma association identifiers.
647
 
648
      procedure Process_Generic_List;
649
      --  Common processing for Share_Generic and Inline_Generic
650
 
651
      procedure Process_Import_Or_Interface;
652
      --  Common processing for Import of Interface
653
 
654
      procedure Process_Inline (Active : Boolean);
655
      --  Common processing for Inline and Inline_Always. The parameter
656
      --  indicates if the inline pragma is active, i.e. if it should actually
657
      --  cause inlining to occur.
658
 
659
      procedure Process_Interface_Name
660
        (Subprogram_Def : Entity_Id;
661
         Ext_Arg        : Node_Id;
662
         Link_Arg       : Node_Id);
663
      --  Given the last two arguments of pragma Import, pragma Export, or
664
      --  pragma Interface_Name, performs validity checks and sets the
665
      --  Interface_Name field of the given subprogram entity to the
666
      --  appropriate external or link name, depending on the arguments given.
667
      --  Ext_Arg is always present, but Link_Arg may be missing. Note that
668
      --  Ext_Arg may represent the Link_Name if Link_Arg is missing, and
669
      --  appropriate named notation is used for Ext_Arg. If neither Ext_Arg
670
      --  nor Link_Arg is present, the interface name is set to the default
671
      --  from the subprogram name.
672
 
673
      procedure Process_Interrupt_Or_Attach_Handler;
674
      --  Common processing for Interrupt and Attach_Handler pragmas
675
 
676
      procedure Process_Restrictions_Or_Restriction_Warnings (Warn : Boolean);
677
      --  Common processing for Restrictions and Restriction_Warnings pragmas.
678
      --  Warn is True for Restriction_Warnings, or for Restrictions if the
679
      --  flag Treat_Restrictions_As_Warnings is set, and False if this flag
680
      --  is not set in the Restrictions case.
681
 
682
      procedure Process_Suppress_Unsuppress (Suppress_Case : Boolean);
683
      --  Common processing for Suppress and Unsuppress. The boolean parameter
684
      --  Suppress_Case is True for the Suppress case, and False for the
685
      --  Unsuppress case.
686
 
687
      procedure Set_Exported (E : Entity_Id; Arg : Node_Id);
688
      --  This procedure sets the Is_Exported flag for the given entity,
689
      --  checking that the entity was not previously imported. Arg is
690
      --  the argument that specified the entity. A check is also made
691
      --  for exporting inappropriate entities.
692
 
693
      procedure Set_Extended_Import_Export_External_Name
694
        (Internal_Ent : Entity_Id;
695
         Arg_External : Node_Id);
696
      --  Common processing for all extended import export pragmas. The first
697
      --  argument, Internal_Ent, is the internal entity, which has already
698
      --  been checked for validity by the caller. Arg_External is from the
699
      --  Import or Export pragma, and may be null if no External parameter
700
      --  was present. If Arg_External is present and is a non-null string
701
      --  (a null string is treated as the default), then the Interface_Name
702
      --  field of Internal_Ent is set appropriately.
703
 
704
      procedure Set_Imported (E : Entity_Id);
705
      --  This procedure sets the Is_Imported flag for the given entity,
706
      --  checking that it is not previously exported or imported.
707
 
708
      procedure Set_Mechanism_Value (Ent : Entity_Id; Mech_Name : Node_Id);
709
      --  Mech is a parameter passing mechanism (see Import_Function syntax
710
      --  for MECHANISM_NAME). This routine checks that the mechanism argument
711
      --  has the right form, and if not issues an error message. If the
712
      --  argument has the right form then the Mechanism field of Ent is
713
      --  set appropriately.
714
 
715
      procedure Set_Ravenscar_Profile (N : Node_Id);
716
      --  Activate the set of configuration pragmas and restrictions that make
717
      --  up the Ravenscar Profile. N is the corresponding pragma node, which
718
      --  is used for error messages on any constructs that violate the
719
      --  profile.
720
 
721
      ---------------------
722
      -- Ada_2005_Pragma --
723
      ---------------------
724
 
725
      procedure Ada_2005_Pragma is
726
      begin
727
         if Ada_Version <= Ada_95 then
728
            Check_Restriction (No_Implementation_Pragmas, N);
729
         end if;
730
      end Ada_2005_Pragma;
731
 
732
      --------------------------
733
      -- Check_Ada_83_Warning --
734
      --------------------------
735
 
736
      procedure Check_Ada_83_Warning is
737
      begin
738
         if Ada_Version = Ada_83 and then Comes_From_Source (N) then
739
            Error_Msg_N ("(Ada 83) pragma& is non-standard?", N);
740
         end if;
741
      end Check_Ada_83_Warning;
742
 
743
      ---------------------
744
      -- Check_Arg_Count --
745
      ---------------------
746
 
747
      procedure Check_Arg_Count (Required : Nat) is
748
      begin
749
         if Arg_Count /= Required then
750
            Error_Pragma ("wrong number of arguments for pragma%");
751
         end if;
752
      end Check_Arg_Count;
753
 
754
      --------------------------------
755
      -- Check_Arg_Is_External_Name --
756
      --------------------------------
757
 
758
      procedure Check_Arg_Is_External_Name (Arg : Node_Id) is
759
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
760
 
761
      begin
762
         if Nkind (Argx) = N_Identifier then
763
            return;
764
 
765
         else
766
            Analyze_And_Resolve (Argx, Standard_String);
767
 
768
            if Is_OK_Static_Expression (Argx) then
769
               return;
770
 
771
            elsif Etype (Argx) = Any_Type then
772
               raise Pragma_Exit;
773
 
774
            --  An interesting special case, if we have a string literal and
775
            --  we are in Ada 83 mode, then we allow it even though it will
776
            --  not be flagged as static. This allows expected Ada 83 mode
777
            --  use of external names which are string literals, even though
778
            --  technically these are not static in Ada 83.
779
 
780
            elsif Ada_Version = Ada_83
781
              and then Nkind (Argx) = N_String_Literal
782
            then
783
               return;
784
 
785
            --  Static expression that raises Constraint_Error. This has
786
            --  already been flagged, so just exit from pragma processing.
787
 
788
            elsif Is_Static_Expression (Argx) then
789
               raise Pragma_Exit;
790
 
791
            --  Here we have a real error (non-static expression)
792
 
793
            else
794
               Error_Msg_Name_1 := Pname;
795
               Flag_Non_Static_Expr
796
                 ("argument for pragma% must be a identifier or " &
797
                  "static string expression!", Argx);
798
               raise Pragma_Exit;
799
            end if;
800
         end if;
801
      end Check_Arg_Is_External_Name;
802
 
803
      -----------------------------
804
      -- Check_Arg_Is_Identifier --
805
      -----------------------------
806
 
807
      procedure Check_Arg_Is_Identifier (Arg : Node_Id) is
808
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
809
      begin
810
         if Nkind (Argx) /= N_Identifier then
811
            Error_Pragma_Arg
812
              ("argument for pragma% must be identifier", Argx);
813
         end if;
814
      end Check_Arg_Is_Identifier;
815
 
816
      ----------------------------------
817
      -- Check_Arg_Is_Integer_Literal --
818
      ----------------------------------
819
 
820
      procedure Check_Arg_Is_Integer_Literal (Arg : Node_Id) is
821
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
822
      begin
823
         if Nkind (Argx) /= N_Integer_Literal then
824
            Error_Pragma_Arg
825
              ("argument for pragma% must be integer literal", Argx);
826
         end if;
827
      end Check_Arg_Is_Integer_Literal;
828
 
829
      -------------------------------------------
830
      -- Check_Arg_Is_Library_Level_Local_Name --
831
      -------------------------------------------
832
 
833
      --  LOCAL_NAME ::=
834
      --    DIRECT_NAME
835
      --  | DIRECT_NAME'ATTRIBUTE_DESIGNATOR
836
      --  | library_unit_NAME
837
 
838
      procedure Check_Arg_Is_Library_Level_Local_Name (Arg : Node_Id) is
839
      begin
840
         Check_Arg_Is_Local_Name (Arg);
841
 
842
         if not Is_Library_Level_Entity (Entity (Expression (Arg)))
843
           and then Comes_From_Source (N)
844
         then
845
            Error_Pragma_Arg
846
              ("argument for pragma% must be library level entity", Arg);
847
         end if;
848
      end Check_Arg_Is_Library_Level_Local_Name;
849
 
850
      -----------------------------
851
      -- Check_Arg_Is_Local_Name --
852
      -----------------------------
853
 
854
      --  LOCAL_NAME ::=
855
      --    DIRECT_NAME
856
      --  | DIRECT_NAME'ATTRIBUTE_DESIGNATOR
857
      --  | library_unit_NAME
858
 
859
      procedure Check_Arg_Is_Local_Name (Arg : Node_Id) is
860
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
861
 
862
      begin
863
         Analyze (Argx);
864
 
865
         if Nkind (Argx) not in N_Direct_Name
866
           and then (Nkind (Argx) /= N_Attribute_Reference
867
                      or else Present (Expressions (Argx))
868
                      or else Nkind (Prefix (Argx)) /= N_Identifier)
869
           and then (not Is_Entity_Name (Argx)
870
                      or else not Is_Compilation_Unit (Entity (Argx)))
871
         then
872
            Error_Pragma_Arg ("argument for pragma% must be local name", Argx);
873
         end if;
874
 
875
         if Is_Entity_Name (Argx)
876
           and then Scope (Entity (Argx)) /= Current_Scope
877
         then
878
            Error_Pragma_Arg
879
              ("pragma% argument must be in same declarative part", Arg);
880
         end if;
881
      end Check_Arg_Is_Local_Name;
882
 
883
      ---------------------------------
884
      -- Check_Arg_Is_Locking_Policy --
885
      ---------------------------------
886
 
887
      procedure Check_Arg_Is_Locking_Policy (Arg : Node_Id) is
888
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
889
 
890
      begin
891
         Check_Arg_Is_Identifier (Argx);
892
 
893
         if not Is_Locking_Policy_Name (Chars (Argx)) then
894
            Error_Pragma_Arg
895
              ("& is not a valid locking policy name", Argx);
896
         end if;
897
      end Check_Arg_Is_Locking_Policy;
898
 
899
      -------------------------
900
      -- Check_Arg_Is_One_Of --
901
      -------------------------
902
 
903
      procedure Check_Arg_Is_One_Of (Arg : Node_Id; N1, N2 : Name_Id) is
904
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
905
 
906
      begin
907
         Check_Arg_Is_Identifier (Argx);
908
 
909
         if Chars (Argx) /= N1 and then Chars (Argx) /= N2 then
910
            Error_Msg_Name_2 := N1;
911
            Error_Msg_Name_3 := N2;
912
            Error_Pragma_Arg ("argument for pragma% must be% or%", Argx);
913
         end if;
914
      end Check_Arg_Is_One_Of;
915
 
916
      procedure Check_Arg_Is_One_Of
917
        (Arg        : Node_Id;
918
         N1, N2, N3 : Name_Id)
919
      is
920
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
921
 
922
      begin
923
         Check_Arg_Is_Identifier (Argx);
924
 
925
         if Chars (Argx) /= N1
926
           and then Chars (Argx) /= N2
927
           and then Chars (Argx) /= N3
928
         then
929
            Error_Pragma_Arg ("invalid argument for pragma%", Argx);
930
         end if;
931
      end Check_Arg_Is_One_Of;
932
 
933
      procedure Check_Arg_Is_One_Of
934
        (Arg            : Node_Id;
935
         N1, N2, N3, N4 : Name_Id)
936
      is
937
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
938
 
939
      begin
940
         Check_Arg_Is_Identifier (Argx);
941
 
942
         if Chars (Argx) /= N1
943
           and then Chars (Argx) /= N2
944
           and then Chars (Argx) /= N3
945
           and then Chars (Argx) /= N4
946
         then
947
            Error_Pragma_Arg ("invalid argument for pragma%", Argx);
948
         end if;
949
      end Check_Arg_Is_One_Of;
950
 
951
      ---------------------------------
952
      -- Check_Arg_Is_Queuing_Policy --
953
      ---------------------------------
954
 
955
      procedure Check_Arg_Is_Queuing_Policy (Arg : Node_Id) is
956
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
957
 
958
      begin
959
         Check_Arg_Is_Identifier (Argx);
960
 
961
         if not Is_Queuing_Policy_Name (Chars (Argx)) then
962
            Error_Pragma_Arg
963
              ("& is not a valid queuing policy name", Argx);
964
         end if;
965
      end Check_Arg_Is_Queuing_Policy;
966
 
967
      ------------------------------------
968
      -- Check_Arg_Is_Static_Expression --
969
      ------------------------------------
970
 
971
      procedure Check_Arg_Is_Static_Expression
972
        (Arg : Node_Id;
973
         Typ : Entity_Id := Empty)
974
      is
975
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
976
 
977
      begin
978
         if Present (Typ) then
979
            Analyze_And_Resolve (Argx, Typ);
980
         else
981
            Analyze_And_Resolve (Argx);
982
         end if;
983
 
984
         if Is_OK_Static_Expression (Argx) then
985
            return;
986
 
987
         elsif Etype (Argx) = Any_Type then
988
            raise Pragma_Exit;
989
 
990
         --  An interesting special case, if we have a string literal and we
991
         --  are in Ada 83 mode, then we allow it even though it will not be
992
         --  flagged as static. This allows the use of Ada 95 pragmas like
993
         --  Import in Ada 83 mode. They will of course be flagged with
994
         --  warnings as usual, but will not cause errors.
995
 
996
         elsif Ada_Version = Ada_83
997
           and then Nkind (Argx) = N_String_Literal
998
         then
999
            return;
1000
 
1001
         --  Static expression that raises Constraint_Error. This has already
1002
         --  been flagged, so just exit from pragma processing.
1003
 
1004
         elsif Is_Static_Expression (Argx) then
1005
            raise Pragma_Exit;
1006
 
1007
         --  Finally, we have a real error
1008
 
1009
         else
1010
            Error_Msg_Name_1 := Pname;
1011
            Flag_Non_Static_Expr
1012
              ("argument for pragma% must be a static expression!", Argx);
1013
            raise Pragma_Exit;
1014
         end if;
1015
      end Check_Arg_Is_Static_Expression;
1016
 
1017
      ---------------------------------
1018
      -- Check_Arg_Is_String_Literal --
1019
      ---------------------------------
1020
 
1021
      procedure Check_Arg_Is_String_Literal (Arg : Node_Id) is
1022
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
1023
      begin
1024
         if Nkind (Argx) /= N_String_Literal then
1025
            Error_Pragma_Arg
1026
              ("argument for pragma% must be string literal", Argx);
1027
         end if;
1028
      end Check_Arg_Is_String_Literal;
1029
 
1030
      ------------------------------------------
1031
      -- Check_Arg_Is_Task_Dispatching_Policy --
1032
      ------------------------------------------
1033
 
1034
      procedure Check_Arg_Is_Task_Dispatching_Policy (Arg : Node_Id) is
1035
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
1036
 
1037
      begin
1038
         Check_Arg_Is_Identifier (Argx);
1039
 
1040
         if not Is_Task_Dispatching_Policy_Name (Chars (Argx)) then
1041
            Error_Pragma_Arg
1042
              ("& is not a valid task dispatching policy name", Argx);
1043
         end if;
1044
      end Check_Arg_Is_Task_Dispatching_Policy;
1045
 
1046
      ---------------------
1047
      -- Check_Arg_Order --
1048
      ---------------------
1049
 
1050
      procedure Check_Arg_Order (Names : Name_List) is
1051
         Arg : Node_Id;
1052
 
1053
         Highest_So_Far : Natural := 0;
1054
         --  Highest index in Names seen do far
1055
 
1056
      begin
1057
         Arg := Arg1;
1058
         for J in 1 .. Arg_Count loop
1059
            if Chars (Arg) /= No_Name then
1060
               for K in Names'Range loop
1061
                  if Chars (Arg) = Names (K) then
1062
                     if K < Highest_So_Far then
1063
                        Error_Msg_Name_1 := Pname;
1064
                        Error_Msg_N
1065
                          ("parameters out of order for pragma%", Arg);
1066
                        Error_Msg_Name_1 := Names (K);
1067
                        Error_Msg_Name_2 := Names (Highest_So_Far);
1068
                        Error_Msg_N ("\% must appear before %", Arg);
1069
                        raise Pragma_Exit;
1070
 
1071
                     else
1072
                        Highest_So_Far := K;
1073
                     end if;
1074
                  end if;
1075
               end loop;
1076
            end if;
1077
 
1078
            Arg := Next (Arg);
1079
         end loop;
1080
      end Check_Arg_Order;
1081
 
1082
      --------------------------------
1083
      -- Check_At_Least_N_Arguments --
1084
      --------------------------------
1085
 
1086
      procedure Check_At_Least_N_Arguments (N : Nat) is
1087
      begin
1088
         if Arg_Count < N then
1089
            Error_Pragma ("too few arguments for pragma%");
1090
         end if;
1091
      end Check_At_Least_N_Arguments;
1092
 
1093
      -------------------------------
1094
      -- Check_At_Most_N_Arguments --
1095
      -------------------------------
1096
 
1097
      procedure Check_At_Most_N_Arguments (N : Nat) is
1098
         Arg : Node_Id;
1099
      begin
1100
         if Arg_Count > N then
1101
            Arg := Arg1;
1102
            for J in 1 .. N loop
1103
               Next (Arg);
1104
               Error_Pragma_Arg ("too many arguments for pragma%", Arg);
1105
            end loop;
1106
         end if;
1107
      end Check_At_Most_N_Arguments;
1108
 
1109
      ---------------------
1110
      -- Check_Component --
1111
      ---------------------
1112
 
1113
      procedure Check_Component (Comp : Node_Id) is
1114
      begin
1115
         if Nkind (Comp) = N_Component_Declaration then
1116
            declare
1117
               Sindic : constant Node_Id :=
1118
                          Subtype_Indication (Component_Definition (Comp));
1119
               Typ    : constant Entity_Id :=
1120
                          Etype (Defining_Identifier (Comp));
1121
            begin
1122
               if Nkind (Sindic) = N_Subtype_Indication then
1123
 
1124
                  --  Ada 2005 (AI-216): If a component subtype is subject to
1125
                  --  a per-object constraint, then the component type shall
1126
                  --  be an Unchecked_Union.
1127
 
1128
                  if Has_Per_Object_Constraint (Defining_Identifier (Comp))
1129
                    and then
1130
                      not Is_Unchecked_Union (Etype (Subtype_Mark (Sindic)))
1131
                  then
1132
                     Error_Msg_N ("component subtype subject to per-object" &
1133
                       " constraint must be an Unchecked_Union", Comp);
1134
                  end if;
1135
               end if;
1136
 
1137
               if Is_Controlled (Typ) then
1138
                  Error_Msg_N
1139
                   ("component of unchecked union cannot be controlled", Comp);
1140
 
1141
               elsif Has_Task (Typ) then
1142
                  Error_Msg_N
1143
                   ("component of unchecked union cannot have tasks", Comp);
1144
               end if;
1145
            end;
1146
         end if;
1147
      end Check_Component;
1148
 
1149
      ----------------------------------
1150
      -- Check_Duplicated_Export_Name --
1151
      ----------------------------------
1152
 
1153
      procedure Check_Duplicated_Export_Name (Nam : Node_Id) is
1154
         String_Val : constant String_Id := Strval (Nam);
1155
 
1156
      begin
1157
         --  We allow duplicated export names in CIL, as they are always
1158
         --  enclosed in a namespace that differentiates them, and overloaded
1159
         --  entities are supported by the VM.
1160
 
1161
         if VM_Target = CLI_Target then
1162
            return;
1163
         end if;
1164
 
1165
         --  We are only interested in the export case, and in the case of
1166
         --  generics, it is the instance, not the template, that is the
1167
         --  problem (the template will generate a warning in any case).
1168
 
1169
         if not Inside_A_Generic
1170
           and then (Prag_Id = Pragma_Export
1171
                       or else
1172
                     Prag_Id = Pragma_Export_Procedure
1173
                       or else
1174
                     Prag_Id = Pragma_Export_Valued_Procedure
1175
                       or else
1176
                     Prag_Id = Pragma_Export_Function)
1177
         then
1178
            for J in Externals.First .. Externals.Last loop
1179
               if String_Equal (String_Val, Strval (Externals.Table (J))) then
1180
                  Error_Msg_Sloc := Sloc (Externals.Table (J));
1181
                  Error_Msg_N ("external name duplicates name given#", Nam);
1182
                  exit;
1183
               end if;
1184
            end loop;
1185
 
1186
            Externals.Append (Nam);
1187
         end if;
1188
      end Check_Duplicated_Export_Name;
1189
 
1190
      -------------------------
1191
      -- Check_First_Subtype --
1192
      -------------------------
1193
 
1194
      procedure Check_First_Subtype (Arg : Node_Id) is
1195
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
1196
      begin
1197
         if not Is_First_Subtype (Entity (Argx)) then
1198
            Error_Pragma_Arg
1199
              ("pragma% cannot apply to subtype", Argx);
1200
         end if;
1201
      end Check_First_Subtype;
1202
 
1203
      ---------------------------
1204
      -- Check_In_Main_Program --
1205
      ---------------------------
1206
 
1207
      procedure Check_In_Main_Program is
1208
         P : constant Node_Id := Parent (N);
1209
 
1210
      begin
1211
         --  Must be at in subprogram body
1212
 
1213
         if Nkind (P) /= N_Subprogram_Body then
1214
            Error_Pragma ("% pragma allowed only in subprogram");
1215
 
1216
         --  Otherwise warn if obviously not main program
1217
 
1218
         elsif Present (Parameter_Specifications (Specification (P)))
1219
           or else not Is_Compilation_Unit (Defining_Entity (P))
1220
         then
1221
            Error_Msg_Name_1 := Pname;
1222
            Error_Msg_N
1223
              ("?pragma% is only effective in main program", N);
1224
         end if;
1225
      end Check_In_Main_Program;
1226
 
1227
      ---------------------------------------
1228
      -- Check_Interrupt_Or_Attach_Handler --
1229
      ---------------------------------------
1230
 
1231
      procedure Check_Interrupt_Or_Attach_Handler is
1232
         Arg1_X : constant Node_Id := Expression (Arg1);
1233
         Handler_Proc, Proc_Scope : Entity_Id;
1234
 
1235
      begin
1236
         Analyze (Arg1_X);
1237
 
1238
         if Prag_Id = Pragma_Interrupt_Handler then
1239
            Check_Restriction (No_Dynamic_Attachment, N);
1240
         end if;
1241
 
1242
         Handler_Proc := Find_Unique_Parameterless_Procedure (Arg1_X, Arg1);
1243
         Proc_Scope := Scope (Handler_Proc);
1244
 
1245
         --  On AAMP only, a pragma Interrupt_Handler is supported for
1246
         --  nonprotected parameterless procedures.
1247
 
1248
         if not AAMP_On_Target
1249
           or else Prag_Id = Pragma_Attach_Handler
1250
         then
1251
            if Ekind (Proc_Scope) /= E_Protected_Type then
1252
               Error_Pragma_Arg
1253
                 ("argument of pragma% must be protected procedure", Arg1);
1254
            end if;
1255
 
1256
            if Parent (N) /= Protected_Definition (Parent (Proc_Scope)) then
1257
               Error_Pragma ("pragma% must be in protected definition");
1258
            end if;
1259
         end if;
1260
 
1261
         if not Is_Library_Level_Entity (Proc_Scope)
1262
           or else (AAMP_On_Target
1263
                     and then not Is_Library_Level_Entity (Handler_Proc))
1264
         then
1265
            Error_Pragma_Arg
1266
              ("argument for pragma% must be library level entity", Arg1);
1267
         end if;
1268
      end Check_Interrupt_Or_Attach_Handler;
1269
 
1270
      -------------------------------------------
1271
      -- Check_Is_In_Decl_Part_Or_Package_Spec --
1272
      -------------------------------------------
1273
 
1274
      procedure Check_Is_In_Decl_Part_Or_Package_Spec is
1275
         P : Node_Id;
1276
 
1277
      begin
1278
         P := Parent (N);
1279
         loop
1280
            if No (P) then
1281
               exit;
1282
 
1283
            elsif Nkind (P) = N_Handled_Sequence_Of_Statements then
1284
               exit;
1285
 
1286
            elsif Nkind_In (P, N_Package_Specification,
1287
                               N_Block_Statement)
1288
            then
1289
               return;
1290
 
1291
            --  Note: the following tests seem a little peculiar, because
1292
            --  they test for bodies, but if we were in the statement part
1293
            --  of the body, we would already have hit the handled statement
1294
            --  sequence, so the only way we get here is by being in the
1295
            --  declarative part of the body.
1296
 
1297
            elsif Nkind_In (P, N_Subprogram_Body,
1298
                               N_Package_Body,
1299
                               N_Task_Body,
1300
                               N_Entry_Body)
1301
            then
1302
               return;
1303
            end if;
1304
 
1305
            P := Parent (P);
1306
         end loop;
1307
 
1308
         Error_Pragma ("pragma% is not in declarative part or package spec");
1309
      end Check_Is_In_Decl_Part_Or_Package_Spec;
1310
 
1311
      -------------------------
1312
      -- Check_No_Identifier --
1313
      -------------------------
1314
 
1315
      procedure Check_No_Identifier (Arg : Node_Id) is
1316
      begin
1317
         if Chars (Arg) /= No_Name then
1318
            Error_Pragma_Arg_Ident
1319
              ("pragma% does not permit identifier& here", Arg);
1320
         end if;
1321
      end Check_No_Identifier;
1322
 
1323
      --------------------------
1324
      -- Check_No_Identifiers --
1325
      --------------------------
1326
 
1327
      procedure Check_No_Identifiers is
1328
         Arg_Node : Node_Id;
1329
      begin
1330
         if Arg_Count > 0 then
1331
            Arg_Node := Arg1;
1332
            while Present (Arg_Node) loop
1333
               Check_No_Identifier (Arg_Node);
1334
               Next (Arg_Node);
1335
            end loop;
1336
         end if;
1337
      end Check_No_Identifiers;
1338
 
1339
      -------------------------------
1340
      -- Check_Optional_Identifier --
1341
      -------------------------------
1342
 
1343
      procedure Check_Optional_Identifier (Arg : Node_Id; Id : Name_Id) is
1344
      begin
1345
         if Present (Arg) and then Chars (Arg) /= No_Name then
1346
            if Chars (Arg) /= Id then
1347
               Error_Msg_Name_1 := Pname;
1348
               Error_Msg_Name_2 := Id;
1349
               Error_Msg_N ("pragma% argument expects identifier%", Arg);
1350
               raise Pragma_Exit;
1351
            end if;
1352
         end if;
1353
      end Check_Optional_Identifier;
1354
 
1355
      procedure Check_Optional_Identifier (Arg : Node_Id; Id : String) is
1356
      begin
1357
         Name_Buffer (1 .. Id'Length) := Id;
1358
         Name_Len := Id'Length;
1359
         Check_Optional_Identifier (Arg, Name_Find);
1360
      end Check_Optional_Identifier;
1361
 
1362
      --------------------------------------
1363
      -- Check_Precondition_Postcondition --
1364
      --------------------------------------
1365
 
1366
      procedure Check_Precondition_Postcondition (In_Body : out Boolean) is
1367
         P  : Node_Id;
1368
         PO : Node_Id;
1369
 
1370
         procedure Chain_PPC (PO : Node_Id);
1371
         --  If PO is a subprogram declaration node (or a generic subprogram
1372
         --  declaration node), then the precondition/postcondition applies
1373
         --  to this subprogram and the processing for the pragma is completed.
1374
         --  Otherwise the pragma is misplaced.
1375
 
1376
         ---------------
1377
         -- Chain_PPC --
1378
         ---------------
1379
 
1380
         procedure Chain_PPC (PO : Node_Id) is
1381
            S : Node_Id;
1382
 
1383
         begin
1384
            if not Nkind_In (PO, N_Subprogram_Declaration,
1385
                                 N_Generic_Subprogram_Declaration)
1386
            then
1387
               Pragma_Misplaced;
1388
            end if;
1389
 
1390
            --  Here if we have subprogram or generic subprogram declaration
1391
 
1392
            S := Defining_Unit_Name (Specification (PO));
1393
 
1394
            --  Analyze the pragma unless it appears within a package spec,
1395
            --  which is the case where we delay the analysis of the PPC until
1396
            --  the end of the package declarations (for details, see
1397
            --  Analyze_Package_Specification.Analyze_PPCs).
1398
 
1399
            if not Is_Package_Or_Generic_Package (Scope (S)) then
1400
               Analyze_PPC_In_Decl_Part (N, S);
1401
            end if;
1402
 
1403
            --  Chain spec PPC pragma to list for subprogram
1404
 
1405
            Set_Next_Pragma (N, Spec_PPC_List (S));
1406
            Set_Spec_PPC_List (S, N);
1407
 
1408
            --  Return indicating spec case
1409
 
1410
            In_Body := False;
1411
            return;
1412
         end Chain_PPC;
1413
 
1414
         --  Start of processing for Check_Precondition_Postcondition
1415
 
1416
      begin
1417
         if not Is_List_Member (N) then
1418
            Pragma_Misplaced;
1419
         end if;
1420
 
1421
         --  Record whether pragma is enabled
1422
 
1423
         Set_Pragma_Enabled (N, Check_Enabled (Pname));
1424
 
1425
         --  If we are within an inlined body, the legality of the pragma
1426
         --  has been checked already.
1427
 
1428
         if In_Inlined_Body then
1429
            In_Body := True;
1430
            return;
1431
         end if;
1432
 
1433
         --  Search prior declarations
1434
 
1435
         P := N;
1436
         while Present (Prev (P)) loop
1437
            P := Prev (P);
1438
 
1439
            --  If the previous node is a generic subprogram, do not go to to
1440
            --  the original node, which is the unanalyzed tree: we need to
1441
            --  attach the pre/postconditions to the analyzed version at this
1442
            --  point. They get propagated to the original tree when analyzing
1443
            --  the corresponding body.
1444
 
1445
            if Nkind (P) not in N_Generic_Declaration then
1446
               PO := Original_Node (P);
1447
            else
1448
               PO := P;
1449
            end if;
1450
 
1451
            --  Skip past prior pragma
1452
 
1453
            if Nkind (PO) = N_Pragma then
1454
               null;
1455
 
1456
            --  Skip stuff not coming from source
1457
 
1458
            elsif not Comes_From_Source (PO) then
1459
               null;
1460
 
1461
            --  Only remaining possibility is subprogram declaration
1462
 
1463
            else
1464
               Chain_PPC (PO);
1465
               return;
1466
            end if;
1467
         end loop;
1468
 
1469
         --  If we fall through loop, pragma is at start of list, so see if it
1470
         --  is at the start of declarations of a subprogram body.
1471
 
1472
         if Nkind (Parent (N)) = N_Subprogram_Body
1473
           and then List_Containing (N) = Declarations (Parent (N))
1474
         then
1475
            if Operating_Mode /= Generate_Code
1476
              or else Inside_A_Generic
1477
            then
1478
 
1479
               --  Analyze expression in pragma, for correctness
1480
               --  and for ASIS use.
1481
 
1482
               Preanalyze_Spec_Expression
1483
                 (Get_Pragma_Arg (Arg1), Standard_Boolean);
1484
            end if;
1485
 
1486
            In_Body := True;
1487
            return;
1488
 
1489
         --  See if it is in the pragmas after a library level subprogram
1490
 
1491
         elsif Nkind (Parent (N)) = N_Compilation_Unit_Aux then
1492
            Chain_PPC (Unit (Parent (Parent (N))));
1493
            return;
1494
         end if;
1495
 
1496
         --  If we fall through, pragma was misplaced
1497
 
1498
         Pragma_Misplaced;
1499
      end Check_Precondition_Postcondition;
1500
 
1501
      -----------------------------
1502
      -- Check_Static_Constraint --
1503
      -----------------------------
1504
 
1505
      --  Note: for convenience in writing this procedure, in addition to
1506
      --  the officially (i.e. by spec) allowed argument which is always a
1507
      --  constraint, it also allows ranges and discriminant associations.
1508
      --  Above is not clear ???
1509
 
1510
      procedure Check_Static_Constraint (Constr : Node_Id) is
1511
 
1512
         procedure Require_Static (E : Node_Id);
1513
         --  Require given expression to be static expression
1514
 
1515
         --------------------
1516
         -- Require_Static --
1517
         --------------------
1518
 
1519
         procedure Require_Static (E : Node_Id) is
1520
         begin
1521
            if not Is_OK_Static_Expression (E) then
1522
               Flag_Non_Static_Expr
1523
                 ("non-static constraint not allowed in Unchecked_Union!", E);
1524
               raise Pragma_Exit;
1525
            end if;
1526
         end Require_Static;
1527
 
1528
      --  Start of processing for Check_Static_Constraint
1529
 
1530
      begin
1531
         case Nkind (Constr) is
1532
            when N_Discriminant_Association =>
1533
               Require_Static (Expression (Constr));
1534
 
1535
            when N_Range =>
1536
               Require_Static (Low_Bound (Constr));
1537
               Require_Static (High_Bound (Constr));
1538
 
1539
            when N_Attribute_Reference =>
1540
               Require_Static (Type_Low_Bound  (Etype (Prefix (Constr))));
1541
               Require_Static (Type_High_Bound (Etype (Prefix (Constr))));
1542
 
1543
            when N_Range_Constraint =>
1544
               Check_Static_Constraint (Range_Expression (Constr));
1545
 
1546
            when N_Index_Or_Discriminant_Constraint =>
1547
               declare
1548
                  IDC : Entity_Id;
1549
               begin
1550
                  IDC := First (Constraints (Constr));
1551
                  while Present (IDC) loop
1552
                     Check_Static_Constraint (IDC);
1553
                     Next (IDC);
1554
                  end loop;
1555
               end;
1556
 
1557
            when others =>
1558
               null;
1559
         end case;
1560
      end Check_Static_Constraint;
1561
 
1562
      --------------------------------------
1563
      -- Check_Valid_Configuration_Pragma --
1564
      --------------------------------------
1565
 
1566
      --  A configuration pragma must appear in the context clause of a
1567
      --  compilation unit, and only other pragmas may precede it. Note that
1568
      --  the test also allows use in a configuration pragma file.
1569
 
1570
      procedure Check_Valid_Configuration_Pragma is
1571
      begin
1572
         if not Is_Configuration_Pragma then
1573
            Error_Pragma ("incorrect placement for configuration pragma%");
1574
         end if;
1575
      end Check_Valid_Configuration_Pragma;
1576
 
1577
      -------------------------------------
1578
      -- Check_Valid_Library_Unit_Pragma --
1579
      -------------------------------------
1580
 
1581
      procedure Check_Valid_Library_Unit_Pragma is
1582
         Plist       : List_Id;
1583
         Parent_Node : Node_Id;
1584
         Unit_Name   : Entity_Id;
1585
         Unit_Kind   : Node_Kind;
1586
         Unit_Node   : Node_Id;
1587
         Sindex      : Source_File_Index;
1588
 
1589
      begin
1590
         if not Is_List_Member (N) then
1591
            Pragma_Misplaced;
1592
 
1593
         else
1594
            Plist := List_Containing (N);
1595
            Parent_Node := Parent (Plist);
1596
 
1597
            if Parent_Node = Empty then
1598
               Pragma_Misplaced;
1599
 
1600
            --  Case of pragma appearing after a compilation unit. In this case
1601
            --  it must have an argument with the corresponding name and must
1602
            --  be part of the following pragmas of its parent.
1603
 
1604
            elsif Nkind (Parent_Node) = N_Compilation_Unit_Aux then
1605
               if Plist /= Pragmas_After (Parent_Node) then
1606
                  Pragma_Misplaced;
1607
 
1608
               elsif Arg_Count = 0 then
1609
                  Error_Pragma
1610
                    ("argument required if outside compilation unit");
1611
 
1612
               else
1613
                  Check_No_Identifiers;
1614
                  Check_Arg_Count (1);
1615
                  Unit_Node := Unit (Parent (Parent_Node));
1616
                  Unit_Kind := Nkind (Unit_Node);
1617
 
1618
                  Analyze (Expression (Arg1));
1619
 
1620
                  if Unit_Kind = N_Generic_Subprogram_Declaration
1621
                    or else Unit_Kind = N_Subprogram_Declaration
1622
                  then
1623
                     Unit_Name := Defining_Entity (Unit_Node);
1624
 
1625
                  elsif Unit_Kind in N_Generic_Instantiation then
1626
                     Unit_Name := Defining_Entity (Unit_Node);
1627
 
1628
                  else
1629
                     Unit_Name := Cunit_Entity (Current_Sem_Unit);
1630
                  end if;
1631
 
1632
                  if Chars (Unit_Name) /=
1633
                     Chars (Entity (Expression (Arg1)))
1634
                  then
1635
                     Error_Pragma_Arg
1636
                       ("pragma% argument is not current unit name", Arg1);
1637
                  end if;
1638
 
1639
                  if Ekind (Unit_Name) = E_Package
1640
                    and then Present (Renamed_Entity (Unit_Name))
1641
                  then
1642
                     Error_Pragma ("pragma% not allowed for renamed package");
1643
                  end if;
1644
               end if;
1645
 
1646
            --  Pragma appears other than after a compilation unit
1647
 
1648
            else
1649
               --  Here we check for the generic instantiation case and also
1650
               --  for the case of processing a generic formal package. We
1651
               --  detect these cases by noting that the Sloc on the node
1652
               --  does not belong to the current compilation unit.
1653
 
1654
               Sindex := Source_Index (Current_Sem_Unit);
1655
 
1656
               if Loc not in Source_First (Sindex) .. Source_Last (Sindex) then
1657
                  Rewrite (N, Make_Null_Statement (Loc));
1658
                  return;
1659
 
1660
               --  If before first declaration, the pragma applies to the
1661
               --  enclosing unit, and the name if present must be this name.
1662
 
1663
               elsif Is_Before_First_Decl (N, Plist) then
1664
                  Unit_Node := Unit_Declaration_Node (Current_Scope);
1665
                  Unit_Kind := Nkind (Unit_Node);
1666
 
1667
                  if Nkind (Parent (Unit_Node)) /= N_Compilation_Unit then
1668
                     Pragma_Misplaced;
1669
 
1670
                  elsif Unit_Kind = N_Subprogram_Body
1671
                    and then not Acts_As_Spec (Unit_Node)
1672
                  then
1673
                     Pragma_Misplaced;
1674
 
1675
                  elsif Nkind (Parent_Node) = N_Package_Body then
1676
                     Pragma_Misplaced;
1677
 
1678
                  elsif Nkind (Parent_Node) = N_Package_Specification
1679
                    and then Plist = Private_Declarations (Parent_Node)
1680
                  then
1681
                     Pragma_Misplaced;
1682
 
1683
                  elsif (Nkind (Parent_Node) = N_Generic_Package_Declaration
1684
                           or else Nkind (Parent_Node) =
1685
                                             N_Generic_Subprogram_Declaration)
1686
                    and then Plist = Generic_Formal_Declarations (Parent_Node)
1687
                  then
1688
                     Pragma_Misplaced;
1689
 
1690
                  elsif Arg_Count > 0 then
1691
                     Analyze (Expression (Arg1));
1692
 
1693
                     if Entity (Expression (Arg1)) /= Current_Scope then
1694
                        Error_Pragma_Arg
1695
                          ("name in pragma% must be enclosing unit", Arg1);
1696
                     end if;
1697
 
1698
                  --  It is legal to have no argument in this context
1699
 
1700
                  else
1701
                     return;
1702
                  end if;
1703
 
1704
               --  Error if not before first declaration. This is because a
1705
               --  library unit pragma argument must be the name of a library
1706
               --  unit (RM 10.1.5(7)), but the only names permitted in this
1707
               --  context are (RM 10.1.5(6)) names of subprogram declarations,
1708
               --  generic subprogram declarations or generic instantiations.
1709
 
1710
               else
1711
                  Error_Pragma
1712
                    ("pragma% misplaced, must be before first declaration");
1713
               end if;
1714
            end if;
1715
         end if;
1716
      end Check_Valid_Library_Unit_Pragma;
1717
 
1718
      -------------------
1719
      -- Check_Variant --
1720
      -------------------
1721
 
1722
      procedure Check_Variant (Variant : Node_Id) is
1723
         Clist : constant Node_Id := Component_List (Variant);
1724
         Comp  : Node_Id;
1725
 
1726
      begin
1727
         if not Is_Non_Empty_List (Component_Items (Clist)) then
1728
            Error_Msg_N
1729
              ("Unchecked_Union may not have empty component list",
1730
               Variant);
1731
            return;
1732
         end if;
1733
 
1734
         Comp := First (Component_Items (Clist));
1735
         while Present (Comp) loop
1736
            Check_Component (Comp);
1737
            Next (Comp);
1738
         end loop;
1739
      end Check_Variant;
1740
 
1741
      ------------------
1742
      -- Error_Pragma --
1743
      ------------------
1744
 
1745
      procedure Error_Pragma (Msg : String) is
1746
      begin
1747
         Error_Msg_Name_1 := Pname;
1748
         Error_Msg_N (Msg, N);
1749
         raise Pragma_Exit;
1750
      end Error_Pragma;
1751
 
1752
      ----------------------
1753
      -- Error_Pragma_Arg --
1754
      ----------------------
1755
 
1756
      procedure Error_Pragma_Arg (Msg : String; Arg : Node_Id) is
1757
      begin
1758
         Error_Msg_Name_1 := Pname;
1759
         Error_Msg_N (Msg, Get_Pragma_Arg (Arg));
1760
         raise Pragma_Exit;
1761
      end Error_Pragma_Arg;
1762
 
1763
      procedure Error_Pragma_Arg (Msg1, Msg2 : String; Arg : Node_Id) is
1764
      begin
1765
         Error_Msg_Name_1 := Pname;
1766
         Error_Msg_N (Msg1, Get_Pragma_Arg (Arg));
1767
         Error_Pragma_Arg (Msg2, Arg);
1768
      end Error_Pragma_Arg;
1769
 
1770
      ----------------------------
1771
      -- Error_Pragma_Arg_Ident --
1772
      ----------------------------
1773
 
1774
      procedure Error_Pragma_Arg_Ident (Msg : String; Arg : Node_Id) is
1775
      begin
1776
         Error_Msg_Name_1 := Pname;
1777
         Error_Msg_N (Msg, Arg);
1778
         raise Pragma_Exit;
1779
      end Error_Pragma_Arg_Ident;
1780
 
1781
      ----------------------
1782
      -- Error_Pragma_Ref --
1783
      ----------------------
1784
 
1785
      procedure Error_Pragma_Ref (Msg : String; Ref : Entity_Id) is
1786
      begin
1787
         Error_Msg_Name_1 := Pname;
1788
         Error_Msg_Sloc   := Sloc (Ref);
1789
         Error_Msg_NE (Msg, N, Ref);
1790
         raise Pragma_Exit;
1791
      end Error_Pragma_Ref;
1792
 
1793
      ------------------------
1794
      -- Find_Lib_Unit_Name --
1795
      ------------------------
1796
 
1797
      function Find_Lib_Unit_Name return Entity_Id is
1798
      begin
1799
         --  Return inner compilation unit entity, for case of nested
1800
         --  categorization pragmas. This happens in generic unit.
1801
 
1802
         if Nkind (Parent (N)) = N_Package_Specification
1803
           and then Defining_Entity (Parent (N)) /= Current_Scope
1804
         then
1805
            return Defining_Entity (Parent (N));
1806
         else
1807
            return Current_Scope;
1808
         end if;
1809
      end Find_Lib_Unit_Name;
1810
 
1811
      ----------------------------
1812
      -- Find_Program_Unit_Name --
1813
      ----------------------------
1814
 
1815
      procedure Find_Program_Unit_Name (Id : Node_Id) is
1816
         Unit_Name : Entity_Id;
1817
         Unit_Kind : Node_Kind;
1818
         P         : constant Node_Id := Parent (N);
1819
 
1820
      begin
1821
         if Nkind (P) = N_Compilation_Unit then
1822
            Unit_Kind := Nkind (Unit (P));
1823
 
1824
            if Unit_Kind = N_Subprogram_Declaration
1825
              or else Unit_Kind = N_Package_Declaration
1826
              or else Unit_Kind in N_Generic_Declaration
1827
            then
1828
               Unit_Name := Defining_Entity (Unit (P));
1829
 
1830
               if Chars (Id) = Chars (Unit_Name) then
1831
                  Set_Entity (Id, Unit_Name);
1832
                  Set_Etype (Id, Etype (Unit_Name));
1833
               else
1834
                  Set_Etype (Id, Any_Type);
1835
                  Error_Pragma
1836
                    ("cannot find program unit referenced by pragma%");
1837
               end if;
1838
 
1839
            else
1840
               Set_Etype (Id, Any_Type);
1841
               Error_Pragma ("pragma% inapplicable to this unit");
1842
            end if;
1843
 
1844
         else
1845
            Analyze (Id);
1846
         end if;
1847
      end Find_Program_Unit_Name;
1848
 
1849
      -----------------------------------------
1850
      -- Find_Unique_Parameterless_Procedure --
1851
      -----------------------------------------
1852
 
1853
      function Find_Unique_Parameterless_Procedure
1854
        (Name : Entity_Id;
1855
         Arg  : Node_Id) return Entity_Id
1856
      is
1857
         Proc : Entity_Id := Empty;
1858
 
1859
      begin
1860
         --  The body of this procedure needs some comments ???
1861
 
1862
         if not Is_Entity_Name (Name) then
1863
            Error_Pragma_Arg
1864
              ("argument of pragma% must be entity name", Arg);
1865
 
1866
         elsif not Is_Overloaded (Name) then
1867
            Proc := Entity (Name);
1868
 
1869
            if Ekind (Proc) /= E_Procedure
1870
                 or else Present (First_Formal (Proc)) then
1871
               Error_Pragma_Arg
1872
                 ("argument of pragma% must be parameterless procedure", Arg);
1873
            end if;
1874
 
1875
         else
1876
            declare
1877
               Found : Boolean := False;
1878
               It    : Interp;
1879
               Index : Interp_Index;
1880
 
1881
            begin
1882
               Get_First_Interp (Name, Index, It);
1883
               while Present (It.Nam) loop
1884
                  Proc := It.Nam;
1885
 
1886
                  if Ekind (Proc) = E_Procedure
1887
                    and then No (First_Formal (Proc))
1888
                  then
1889
                     if not Found then
1890
                        Found := True;
1891
                        Set_Entity (Name, Proc);
1892
                        Set_Is_Overloaded (Name, False);
1893
                     else
1894
                        Error_Pragma_Arg
1895
                          ("ambiguous handler name for pragma% ", Arg);
1896
                     end if;
1897
                  end if;
1898
 
1899
                  Get_Next_Interp (Index, It);
1900
               end loop;
1901
 
1902
               if not Found then
1903
                  Error_Pragma_Arg
1904
                    ("argument of pragma% must be parameterless procedure",
1905
                     Arg);
1906
               else
1907
                  Proc := Entity (Name);
1908
               end if;
1909
            end;
1910
         end if;
1911
 
1912
         return Proc;
1913
      end Find_Unique_Parameterless_Procedure;
1914
 
1915
      -------------------------
1916
      -- Gather_Associations --
1917
      -------------------------
1918
 
1919
      procedure Gather_Associations
1920
        (Names : Name_List;
1921
         Args  : out Args_List)
1922
      is
1923
         Arg : Node_Id;
1924
 
1925
      begin
1926
         --  Initialize all parameters to Empty
1927
 
1928
         for J in Args'Range loop
1929
            Args (J) := Empty;
1930
         end loop;
1931
 
1932
         --  That's all we have to do if there are no argument associations
1933
 
1934
         if No (Pragma_Argument_Associations (N)) then
1935
            return;
1936
         end if;
1937
 
1938
         --  Otherwise first deal with any positional parameters present
1939
 
1940
         Arg := First (Pragma_Argument_Associations (N));
1941
         for Index in Args'Range loop
1942
            exit when No (Arg) or else Chars (Arg) /= No_Name;
1943
            Args (Index) := Expression (Arg);
1944
            Next (Arg);
1945
         end loop;
1946
 
1947
         --  Positional parameters all processed, if any left, then we
1948
         --  have too many positional parameters.
1949
 
1950
         if Present (Arg) and then Chars (Arg) = No_Name then
1951
            Error_Pragma_Arg
1952
              ("too many positional associations for pragma%", Arg);
1953
         end if;
1954
 
1955
         --  Process named parameters if any are present
1956
 
1957
         while Present (Arg) loop
1958
            if Chars (Arg) = No_Name then
1959
               Error_Pragma_Arg
1960
                 ("positional association cannot follow named association",
1961
                  Arg);
1962
 
1963
            else
1964
               for Index in Names'Range loop
1965
                  if Names (Index) = Chars (Arg) then
1966
                     if Present (Args (Index)) then
1967
                        Error_Pragma_Arg
1968
                          ("duplicate argument association for pragma%", Arg);
1969
                     else
1970
                        Args (Index) := Expression (Arg);
1971
                        exit;
1972
                     end if;
1973
                  end if;
1974
 
1975
                  if Index = Names'Last then
1976
                     Error_Msg_Name_1 := Pname;
1977
                     Error_Msg_N ("pragma% does not allow & argument", Arg);
1978
 
1979
                     --  Check for possible misspelling
1980
 
1981
                     for Index1 in Names'Range loop
1982
                        if Is_Bad_Spelling_Of
1983
                             (Chars (Arg), Names (Index1))
1984
                        then
1985
                           Error_Msg_Name_1 := Names (Index1);
1986
                           Error_Msg_N -- CODEFIX
1987
                             ("\possible misspelling of%", Arg);
1988
                           exit;
1989
                        end if;
1990
                     end loop;
1991
 
1992
                     raise Pragma_Exit;
1993
                  end if;
1994
               end loop;
1995
            end if;
1996
 
1997
            Next (Arg);
1998
         end loop;
1999
      end Gather_Associations;
2000
 
2001
      -----------------
2002
      -- GNAT_Pragma --
2003
      -----------------
2004
 
2005
      procedure GNAT_Pragma is
2006
      begin
2007
         Check_Restriction (No_Implementation_Pragmas, N);
2008
      end GNAT_Pragma;
2009
 
2010
      --------------------------
2011
      -- Is_Before_First_Decl --
2012
      --------------------------
2013
 
2014
      function Is_Before_First_Decl
2015
        (Pragma_Node : Node_Id;
2016
         Decls       : List_Id) return Boolean
2017
      is
2018
         Item : Node_Id := First (Decls);
2019
 
2020
      begin
2021
         --  Only other pragmas can come before this pragma
2022
 
2023
         loop
2024
            if No (Item) or else Nkind (Item) /= N_Pragma then
2025
               return False;
2026
 
2027
            elsif Item = Pragma_Node then
2028
               return True;
2029
            end if;
2030
 
2031
            Next (Item);
2032
         end loop;
2033
      end Is_Before_First_Decl;
2034
 
2035
      -----------------------------
2036
      -- Is_Configuration_Pragma --
2037
      -----------------------------
2038
 
2039
      --  A configuration pragma must appear in the context clause of a
2040
      --  compilation unit, and only other pragmas may precede it. Note that
2041
      --  the test below also permits use in a configuration pragma file.
2042
 
2043
      function Is_Configuration_Pragma return Boolean is
2044
         Lis : constant List_Id := List_Containing (N);
2045
         Par : constant Node_Id := Parent (N);
2046
         Prg : Node_Id;
2047
 
2048
      begin
2049
         --  If no parent, then we are in the configuration pragma file,
2050
         --  so the placement is definitely appropriate.
2051
 
2052
         if No (Par) then
2053
            return True;
2054
 
2055
         --  Otherwise we must be in the context clause of a compilation unit
2056
         --  and the only thing allowed before us in the context list is more
2057
         --  configuration pragmas.
2058
 
2059
         elsif Nkind (Par) = N_Compilation_Unit
2060
           and then Context_Items (Par) = Lis
2061
         then
2062
            Prg := First (Lis);
2063
 
2064
            loop
2065
               if Prg = N then
2066
                  return True;
2067
               elsif Nkind (Prg) /= N_Pragma then
2068
                  return False;
2069
               end if;
2070
 
2071
               Next (Prg);
2072
            end loop;
2073
 
2074
         else
2075
            return False;
2076
         end if;
2077
      end Is_Configuration_Pragma;
2078
 
2079
      --------------------------
2080
      -- Is_In_Context_Clause --
2081
      --------------------------
2082
 
2083
      function Is_In_Context_Clause return Boolean is
2084
         Plist       : List_Id;
2085
         Parent_Node : Node_Id;
2086
 
2087
      begin
2088
         if not Is_List_Member (N) then
2089
            return False;
2090
 
2091
         else
2092
            Plist := List_Containing (N);
2093
            Parent_Node := Parent (Plist);
2094
 
2095
            if Parent_Node = Empty
2096
              or else Nkind (Parent_Node) /= N_Compilation_Unit
2097
              or else Context_Items (Parent_Node) /= Plist
2098
            then
2099
               return False;
2100
            end if;
2101
         end if;
2102
 
2103
         return True;
2104
      end Is_In_Context_Clause;
2105
 
2106
      ---------------------------------
2107
      -- Is_Static_String_Expression --
2108
      ---------------------------------
2109
 
2110
      function Is_Static_String_Expression (Arg : Node_Id) return Boolean is
2111
         Argx : constant Node_Id := Get_Pragma_Arg (Arg);
2112
 
2113
      begin
2114
         Analyze_And_Resolve (Argx);
2115
         return Is_OK_Static_Expression (Argx)
2116
           and then Nkind (Argx) = N_String_Literal;
2117
      end Is_Static_String_Expression;
2118
 
2119
      ----------------------
2120
      -- Pragma_Misplaced --
2121
      ----------------------
2122
 
2123
      procedure Pragma_Misplaced is
2124
      begin
2125
         Error_Pragma ("incorrect placement of pragma%");
2126
      end Pragma_Misplaced;
2127
 
2128
      ------------------------------------
2129
      -- Process Atomic_Shared_Volatile --
2130
      ------------------------------------
2131
 
2132
      procedure Process_Atomic_Shared_Volatile is
2133
         E_Id : Node_Id;
2134
         E    : Entity_Id;
2135
         D    : Node_Id;
2136
         K    : Node_Kind;
2137
         Utyp : Entity_Id;
2138
 
2139
         procedure Set_Atomic (E : Entity_Id);
2140
         --  Set given type as atomic, and if no explicit alignment was given,
2141
         --  set alignment to unknown, since back end knows what the alignment
2142
         --  requirements are for atomic arrays. Note: this step is necessary
2143
         --  for derived types.
2144
 
2145
         ----------------
2146
         -- Set_Atomic --
2147
         ----------------
2148
 
2149
         procedure Set_Atomic (E : Entity_Id) is
2150
         begin
2151
            Set_Is_Atomic (E);
2152
 
2153
            if not Has_Alignment_Clause (E) then
2154
               Set_Alignment (E, Uint_0);
2155
            end if;
2156
         end Set_Atomic;
2157
 
2158
      --  Start of processing for Process_Atomic_Shared_Volatile
2159
 
2160
      begin
2161
         Check_Ada_83_Warning;
2162
         Check_No_Identifiers;
2163
         Check_Arg_Count (1);
2164
         Check_Arg_Is_Local_Name (Arg1);
2165
         E_Id := Expression (Arg1);
2166
 
2167
         if Etype (E_Id) = Any_Type then
2168
            return;
2169
         end if;
2170
 
2171
         E := Entity (E_Id);
2172
         D := Declaration_Node (E);
2173
         K := Nkind (D);
2174
 
2175
         if Is_Type (E) then
2176
            if Rep_Item_Too_Early (E, N)
2177
                 or else
2178
               Rep_Item_Too_Late (E, N)
2179
            then
2180
               return;
2181
            else
2182
               Check_First_Subtype (Arg1);
2183
            end if;
2184
 
2185
            if Prag_Id /= Pragma_Volatile then
2186
               Set_Atomic (E);
2187
               Set_Atomic (Underlying_Type (E));
2188
               Set_Atomic (Base_Type (E));
2189
            end if;
2190
 
2191
            --  Attribute belongs on the base type. If the view of the type is
2192
            --  currently private, it also belongs on the underlying type.
2193
 
2194
            Set_Is_Volatile (Base_Type (E));
2195
            Set_Is_Volatile (Underlying_Type (E));
2196
 
2197
            Set_Treat_As_Volatile (E);
2198
            Set_Treat_As_Volatile (Underlying_Type (E));
2199
 
2200
         elsif K = N_Object_Declaration
2201
           or else (K = N_Component_Declaration
2202
                     and then Original_Record_Component (E) = E)
2203
         then
2204
            if Rep_Item_Too_Late (E, N) then
2205
               return;
2206
            end if;
2207
 
2208
            if Prag_Id /= Pragma_Volatile then
2209
               Set_Is_Atomic (E);
2210
 
2211
               --  If the object declaration has an explicit initialization, a
2212
               --  temporary may have to be created to hold the expression, to
2213
               --  ensure that access to the object remain atomic.
2214
 
2215
               if Nkind (Parent (E)) = N_Object_Declaration
2216
                 and then Present (Expression (Parent (E)))
2217
               then
2218
                  Set_Has_Delayed_Freeze (E);
2219
               end if;
2220
 
2221
               --  An interesting improvement here. If an object of type X is
2222
               --  declared atomic, and the type X is not atomic, that's a
2223
               --  pity, since it may not have appropriate alignment etc. We
2224
               --  can rescue this in the special case where the object and
2225
               --  type are in the same unit by just setting the type as
2226
               --  atomic, so that the back end will process it as atomic.
2227
 
2228
               Utyp := Underlying_Type (Etype (E));
2229
 
2230
               if Present (Utyp)
2231
                 and then Sloc (E) > No_Location
2232
                 and then Sloc (Utyp) > No_Location
2233
                 and then
2234
                   Get_Source_File_Index (Sloc (E)) =
2235
                   Get_Source_File_Index (Sloc (Underlying_Type (Etype (E))))
2236
               then
2237
                  Set_Is_Atomic (Underlying_Type (Etype (E)));
2238
               end if;
2239
            end if;
2240
 
2241
            Set_Is_Volatile (E);
2242
            Set_Treat_As_Volatile (E);
2243
 
2244
         else
2245
            Error_Pragma_Arg
2246
              ("inappropriate entity for pragma%", Arg1);
2247
         end if;
2248
      end Process_Atomic_Shared_Volatile;
2249
 
2250
      -------------------------------------------
2251
      -- Process_Compile_Time_Warning_Or_Error --
2252
      -------------------------------------------
2253
 
2254
      procedure Process_Compile_Time_Warning_Or_Error is
2255
         Arg1x : constant Node_Id := Get_Pragma_Arg (Arg1);
2256
 
2257
      begin
2258
         Check_Arg_Count (2);
2259
         Check_No_Identifiers;
2260
         Check_Arg_Is_Static_Expression (Arg2, Standard_String);
2261
         Analyze_And_Resolve (Arg1x, Standard_Boolean);
2262
 
2263
         if Compile_Time_Known_Value (Arg1x) then
2264
            if Is_True (Expr_Value (Get_Pragma_Arg (Arg1))) then
2265
               declare
2266
                  Str   : constant String_Id :=
2267
                            Strval (Get_Pragma_Arg (Arg2));
2268
                  Len   : constant Int := String_Length (Str);
2269
                  Cont  : Boolean;
2270
                  Ptr   : Nat;
2271
                  CC    : Char_Code;
2272
                  C     : Character;
2273
                  Cent  : constant Entity_Id :=
2274
                            Cunit_Entity (Current_Sem_Unit);
2275
 
2276
                  Force : constant Boolean :=
2277
                            Prag_Id = Pragma_Compile_Time_Warning
2278
                              and then
2279
                                Is_Spec_Name (Unit_Name (Current_Sem_Unit))
2280
                              and then (Ekind (Cent) /= E_Package
2281
                                          or else not In_Private_Part (Cent));
2282
                  --  Set True if this is the warning case, and we are in the
2283
                  --  visible part of a package spec, or in a subprogram spec,
2284
                  --  in which case we want to force the client to see the
2285
                  --  warning, even though it is not in the main unit.
2286
 
2287
               begin
2288
                  --  Loop through segments of message separated by line feeds.
2289
                  --  We output these segments as separate messages with
2290
                  --  continuation marks for all but the first.
2291
 
2292
                  Cont := False;
2293
                  Ptr := 1;
2294
                  loop
2295
                     Error_Msg_Strlen := 0;
2296
 
2297
                     --  Loop to copy characters from argument to error message
2298
                     --  string buffer.
2299
 
2300
                     loop
2301
                        exit when Ptr > Len;
2302
                        CC := Get_String_Char (Str, Ptr);
2303
                        Ptr := Ptr + 1;
2304
 
2305
                        --  Ignore wide chars ??? else store character
2306
 
2307
                        if In_Character_Range (CC) then
2308
                           C := Get_Character (CC);
2309
                           exit when C = ASCII.LF;
2310
                           Error_Msg_Strlen := Error_Msg_Strlen + 1;
2311
                           Error_Msg_String (Error_Msg_Strlen) := C;
2312
                        end if;
2313
                     end loop;
2314
 
2315
                     --  Here with one line ready to go
2316
 
2317
                     Error_Msg_Warn := Prag_Id = Pragma_Compile_Time_Warning;
2318
 
2319
                     --  If this is a warning in a spec, then we want clients
2320
                     --  to see the warning, so mark the message with the
2321
                     --  special sequence !! to force the warning. In the case
2322
                     --  of a package spec, we do not force this if we are in
2323
                     --  the private part of the spec.
2324
 
2325
                     if Force then
2326
                        if Cont = False then
2327
                           Error_Msg_N ("<~!!", Arg1);
2328
                           Cont := True;
2329
                        else
2330
                           Error_Msg_N ("\<~!!", Arg1);
2331
                        end if;
2332
 
2333
                     --  Error, rather than warning, or in a body, so we do not
2334
                     --  need to force visibility for client (error will be
2335
                     --  output in any case, and this is the situation in which
2336
                     --  we do not want a client to get a warning, since the
2337
                     --  warning is in the body or the spec private part.
2338
 
2339
                     else
2340
                        if Cont = False then
2341
                           Error_Msg_N ("<~", Arg1);
2342
                           Cont := True;
2343
                        else
2344
                           Error_Msg_N ("\<~", Arg1);
2345
                        end if;
2346
                     end if;
2347
 
2348
                     exit when Ptr > Len;
2349
                  end loop;
2350
               end;
2351
            end if;
2352
         end if;
2353
      end Process_Compile_Time_Warning_Or_Error;
2354
 
2355
      ------------------------
2356
      -- Process_Convention --
2357
      ------------------------
2358
 
2359
      procedure Process_Convention
2360
        (C   : out Convention_Id;
2361
         Ent : out Entity_Id)
2362
      is
2363
         Id        : Node_Id;
2364
         E         : Entity_Id;
2365
         E1        : Entity_Id;
2366
         Cname     : Name_Id;
2367
         Comp_Unit : Unit_Number_Type;
2368
 
2369
         procedure Set_Convention_From_Pragma (E : Entity_Id);
2370
         --  Set convention in entity E, and also flag that the entity has a
2371
         --  convention pragma. If entity is for a private or incomplete type,
2372
         --  also set convention and flag on underlying type. This procedure
2373
         --  also deals with the special case of C_Pass_By_Copy convention.
2374
 
2375
         --------------------------------
2376
         -- Set_Convention_From_Pragma --
2377
         --------------------------------
2378
 
2379
         procedure Set_Convention_From_Pragma (E : Entity_Id) is
2380
         begin
2381
            --  Ada 2005 (AI-430): Check invalid attempt to change convention
2382
            --  for an overridden dispatching operation. Technically this is
2383
            --  an amendment and should only be done in Ada 2005 mode. However,
2384
            --  this is clearly a mistake, since the problem that is addressed
2385
            --  by this AI is that there is a clear gap in the RM!
2386
 
2387
            if Is_Dispatching_Operation (E)
2388
              and then Present (Overridden_Operation (E))
2389
              and then C /= Convention (Overridden_Operation (E))
2390
            then
2391
               Error_Pragma_Arg
2392
                 ("cannot change convention for " &
2393
                  "overridden dispatching operation",
2394
                  Arg1);
2395
            end if;
2396
 
2397
            --  Set the convention
2398
 
2399
            Set_Convention (E, C);
2400
            Set_Has_Convention_Pragma (E);
2401
 
2402
            if Is_Incomplete_Or_Private_Type (E) then
2403
               Set_Convention            (Underlying_Type (E), C);
2404
               Set_Has_Convention_Pragma (Underlying_Type (E), True);
2405
            end if;
2406
 
2407
            --  A class-wide type should inherit the convention of the specific
2408
            --  root type (although this isn't specified clearly by the RM).
2409
 
2410
            if Is_Type (E) and then Present (Class_Wide_Type (E)) then
2411
               Set_Convention (Class_Wide_Type (E), C);
2412
            end if;
2413
 
2414
            --  If the entity is a record type, then check for special case of
2415
            --  C_Pass_By_Copy, which is treated the same as C except that the
2416
            --  special record flag is set. This convention is only permitted
2417
            --  on record types (see AI95-00131).
2418
 
2419
            if Cname = Name_C_Pass_By_Copy then
2420
               if Is_Record_Type (E) then
2421
                  Set_C_Pass_By_Copy (Base_Type (E));
2422
               elsif Is_Incomplete_Or_Private_Type (E)
2423
                 and then Is_Record_Type (Underlying_Type (E))
2424
               then
2425
                  Set_C_Pass_By_Copy (Base_Type (Underlying_Type (E)));
2426
               else
2427
                  Error_Pragma_Arg
2428
                    ("C_Pass_By_Copy convention allowed only for record type",
2429
                     Arg2);
2430
               end if;
2431
            end if;
2432
 
2433
            --  If the entity is a derived boolean type, check for the special
2434
            --  case of convention C, C++, or Fortran, where we consider any
2435
            --  nonzero value to represent true.
2436
 
2437
            if Is_Discrete_Type (E)
2438
              and then Root_Type (Etype (E)) = Standard_Boolean
2439
              and then
2440
                (C = Convention_C
2441
                   or else
2442
                 C = Convention_CPP
2443
                   or else
2444
                 C = Convention_Fortran)
2445
            then
2446
               Set_Nonzero_Is_True (Base_Type (E));
2447
            end if;
2448
         end Set_Convention_From_Pragma;
2449
 
2450
      --  Start of processing for Process_Convention
2451
 
2452
      begin
2453
         Check_At_Least_N_Arguments (2);
2454
         Check_Optional_Identifier (Arg1, Name_Convention);
2455
         Check_Arg_Is_Identifier (Arg1);
2456
         Cname := Chars (Expression (Arg1));
2457
 
2458
         --  C_Pass_By_Copy is treated as a synonym for convention C (this is
2459
         --  tested again below to set the critical flag).
2460
         if Cname = Name_C_Pass_By_Copy then
2461
            C := Convention_C;
2462
 
2463
         --  Otherwise we must have something in the standard convention list
2464
 
2465
         elsif Is_Convention_Name (Cname) then
2466
            C := Get_Convention_Id (Chars (Expression (Arg1)));
2467
 
2468
         --  In DEC VMS, it seems that there is an undocumented feature that
2469
         --  any unrecognized convention is treated as the default, which for
2470
         --  us is convention C. It does not seem so terrible to do this
2471
         --  unconditionally, silently in the VMS case, and with a warning
2472
         --  in the non-VMS case.
2473
 
2474
         else
2475
            if Warn_On_Export_Import and not OpenVMS_On_Target then
2476
               Error_Msg_N
2477
                 ("?unrecognized convention name, C assumed",
2478
                  Expression (Arg1));
2479
            end if;
2480
 
2481
            C := Convention_C;
2482
         end if;
2483
 
2484
         Check_Optional_Identifier (Arg2, Name_Entity);
2485
         Check_Arg_Is_Local_Name (Arg2);
2486
 
2487
         Id := Expression (Arg2);
2488
         Analyze (Id);
2489
 
2490
         if not Is_Entity_Name (Id) then
2491
            Error_Pragma_Arg ("entity name required", Arg2);
2492
         end if;
2493
 
2494
         E := Entity (Id);
2495
 
2496
         --  Set entity to return
2497
 
2498
         Ent := E;
2499
 
2500
         --  Go to renamed subprogram if present, since convention applies to
2501
         --  the actual renamed entity, not to the renaming entity. If the
2502
         --  subprogram is inherited, go to parent subprogram.
2503
 
2504
         if Is_Subprogram (E)
2505
           and then Present (Alias (E))
2506
         then
2507
            if Nkind (Parent (Declaration_Node (E))) =
2508
                                       N_Subprogram_Renaming_Declaration
2509
            then
2510
               if Scope (E) /= Scope (Alias (E)) then
2511
                  Error_Pragma_Ref
2512
                    ("cannot apply pragma% to non-local entity&#", E);
2513
               end if;
2514
 
2515
               E := Alias (E);
2516
 
2517
            elsif Nkind_In (Parent (E), N_Full_Type_Declaration,
2518
                                        N_Private_Extension_Declaration)
2519
              and then Scope (E) = Scope (Alias (E))
2520
            then
2521
               E := Alias (E);
2522
 
2523
               --  Return the parent subprogram the entity was inherited from
2524
 
2525
               Ent := E;
2526
            end if;
2527
         end if;
2528
 
2529
         --  Check that we are not applying this to a specless body
2530
 
2531
         if Is_Subprogram (E)
2532
           and then Nkind (Parent (Declaration_Node (E))) = N_Subprogram_Body
2533
         then
2534
            Error_Pragma
2535
              ("pragma% requires separate spec and must come before body");
2536
         end if;
2537
 
2538
         --  Check that we are not applying this to a named constant
2539
 
2540
         if Ekind (E) = E_Named_Integer
2541
              or else
2542
            Ekind (E) = E_Named_Real
2543
         then
2544
            Error_Msg_Name_1 := Pname;
2545
            Error_Msg_N
2546
              ("cannot apply pragma% to named constant!",
2547
               Get_Pragma_Arg (Arg2));
2548
            Error_Pragma_Arg
2549
              ("\supply appropriate type for&!", Arg2);
2550
         end if;
2551
 
2552
         if Ekind (E) = E_Enumeration_Literal then
2553
            Error_Pragma ("enumeration literal not allowed for pragma%");
2554
         end if;
2555
 
2556
         --  Check for rep item appearing too early or too late
2557
 
2558
         if Etype (E) = Any_Type
2559
           or else Rep_Item_Too_Early (E, N)
2560
         then
2561
            raise Pragma_Exit;
2562
         else
2563
            E := Underlying_Type (E);
2564
         end if;
2565
 
2566
         if Rep_Item_Too_Late (E, N) then
2567
            raise Pragma_Exit;
2568
         end if;
2569
 
2570
         if Has_Convention_Pragma (E) then
2571
            Error_Pragma_Arg
2572
              ("at most one Convention/Export/Import pragma is allowed", Arg2);
2573
 
2574
         elsif Convention (E) = Convention_Protected
2575
           or else Ekind (Scope (E)) = E_Protected_Type
2576
         then
2577
            Error_Pragma_Arg
2578
              ("a protected operation cannot be given a different convention",
2579
                Arg2);
2580
         end if;
2581
 
2582
         --  For Intrinsic, a subprogram is required
2583
 
2584
         if C = Convention_Intrinsic
2585
           and then not Is_Subprogram (E)
2586
           and then not Is_Generic_Subprogram (E)
2587
         then
2588
            Error_Pragma_Arg
2589
              ("second argument of pragma% must be a subprogram", Arg2);
2590
         end if;
2591
 
2592
         --  For Stdcall, a subprogram, variable or subprogram type is required
2593
 
2594
         if C = Convention_Stdcall
2595
           and then not Is_Subprogram (E)
2596
           and then not Is_Generic_Subprogram (E)
2597
           and then Ekind (E) /= E_Variable
2598
           and then not
2599
             (Is_Access_Type (E)
2600
                and then Ekind (Designated_Type (E)) = E_Subprogram_Type)
2601
         then
2602
            Error_Pragma_Arg
2603
              ("second argument of pragma% must be subprogram (type)",
2604
               Arg2);
2605
         end if;
2606
 
2607
         if not Is_Subprogram (E)
2608
           and then not Is_Generic_Subprogram (E)
2609
         then
2610
            Set_Convention_From_Pragma (E);
2611
 
2612
            if Is_Type (E) then
2613
 
2614
               Check_First_Subtype (Arg2);
2615
               Set_Convention_From_Pragma (Base_Type (E));
2616
 
2617
               --  For subprograms, we must set the convention on the
2618
               --  internally generated directly designated type as well.
2619
 
2620
               if Ekind (E) = E_Access_Subprogram_Type then
2621
                  Set_Convention_From_Pragma (Directly_Designated_Type (E));
2622
               end if;
2623
            end if;
2624
 
2625
         --  For the subprogram case, set proper convention for all homonyms
2626
         --  in same scope and the same declarative part, i.e. the same
2627
         --  compilation unit.
2628
 
2629
         else
2630
            Comp_Unit := Get_Source_Unit (E);
2631
            Set_Convention_From_Pragma (E);
2632
 
2633
            --  Treat a pragma Import as an implicit body, for GPS use
2634
 
2635
            if Prag_Id = Pragma_Import then
2636
               Generate_Reference (E, Id, 'b');
2637
            end if;
2638
 
2639
            --  Loop through the homonyms of the pragma argument's entity
2640
 
2641
            E1 := Ent;
2642
            loop
2643
               E1 := Homonym (E1);
2644
               exit when No (E1) or else Scope (E1) /= Current_Scope;
2645
 
2646
               --  Do not set the pragma on inherited operations or on formal
2647
               --  subprograms.
2648
 
2649
               if Comes_From_Source (E1)
2650
                 and then Comp_Unit = Get_Source_Unit (E1)
2651
                 and then not Is_Formal_Subprogram (E1)
2652
                 and then Nkind (Original_Node (Parent (E1))) /=
2653
                                                    N_Full_Type_Declaration
2654
               then
2655
                  if Present (Alias (E1))
2656
                    and then Scope (E1) /= Scope (Alias (E1))
2657
                  then
2658
                     Error_Pragma_Ref
2659
                       ("cannot apply pragma% to non-local entity& declared#",
2660
                        E1);
2661
                  end if;
2662
 
2663
                  Set_Convention_From_Pragma (E1);
2664
 
2665
                  if Prag_Id = Pragma_Import then
2666
                     Generate_Reference (E1, Id, 'b');
2667
                  end if;
2668
               end if;
2669
            end loop;
2670
         end if;
2671
      end Process_Convention;
2672
 
2673
      -----------------------------------------------------
2674
      -- Process_Extended_Import_Export_Exception_Pragma --
2675
      -----------------------------------------------------
2676
 
2677
      procedure Process_Extended_Import_Export_Exception_Pragma
2678
        (Arg_Internal : Node_Id;
2679
         Arg_External : Node_Id;
2680
         Arg_Form     : Node_Id;
2681
         Arg_Code     : Node_Id)
2682
      is
2683
         Def_Id   : Entity_Id;
2684
         Code_Val : Uint;
2685
 
2686
      begin
2687
         if not OpenVMS_On_Target then
2688
            Error_Pragma
2689
              ("?pragma% ignored (applies only to Open'V'M'S)");
2690
         end if;
2691
 
2692
         Process_Extended_Import_Export_Internal_Arg (Arg_Internal);
2693
         Def_Id := Entity (Arg_Internal);
2694
 
2695
         if Ekind (Def_Id) /= E_Exception then
2696
            Error_Pragma_Arg
2697
              ("pragma% must refer to declared exception", Arg_Internal);
2698
         end if;
2699
 
2700
         Set_Extended_Import_Export_External_Name (Def_Id, Arg_External);
2701
 
2702
         if Present (Arg_Form) then
2703
            Check_Arg_Is_One_Of (Arg_Form, Name_Ada, Name_VMS);
2704
         end if;
2705
 
2706
         if Present (Arg_Form)
2707
           and then Chars (Arg_Form) = Name_Ada
2708
         then
2709
            null;
2710
         else
2711
            Set_Is_VMS_Exception (Def_Id);
2712
            Set_Exception_Code (Def_Id, No_Uint);
2713
         end if;
2714
 
2715
         if Present (Arg_Code) then
2716
            if not Is_VMS_Exception (Def_Id) then
2717
               Error_Pragma_Arg
2718
                 ("Code option for pragma% not allowed for Ada case",
2719
                  Arg_Code);
2720
            end if;
2721
 
2722
            Check_Arg_Is_Static_Expression (Arg_Code, Any_Integer);
2723
            Code_Val := Expr_Value (Arg_Code);
2724
 
2725
            if not UI_Is_In_Int_Range (Code_Val) then
2726
               Error_Pragma_Arg
2727
                 ("Code option for pragma% must be in 32-bit range",
2728
                  Arg_Code);
2729
 
2730
            else
2731
               Set_Exception_Code (Def_Id, Code_Val);
2732
            end if;
2733
         end if;
2734
      end Process_Extended_Import_Export_Exception_Pragma;
2735
 
2736
      -------------------------------------------------
2737
      -- Process_Extended_Import_Export_Internal_Arg --
2738
      -------------------------------------------------
2739
 
2740
      procedure Process_Extended_Import_Export_Internal_Arg
2741
        (Arg_Internal : Node_Id := Empty)
2742
      is
2743
      begin
2744
         if No (Arg_Internal) then
2745
            Error_Pragma ("Internal parameter required for pragma%");
2746
         end if;
2747
 
2748
         if Nkind (Arg_Internal) = N_Identifier then
2749
            null;
2750
 
2751
         elsif Nkind (Arg_Internal) = N_Operator_Symbol
2752
           and then (Prag_Id = Pragma_Import_Function
2753
                       or else
2754
                     Prag_Id = Pragma_Export_Function)
2755
         then
2756
            null;
2757
 
2758
         else
2759
            Error_Pragma_Arg
2760
              ("wrong form for Internal parameter for pragma%", Arg_Internal);
2761
         end if;
2762
 
2763
         Check_Arg_Is_Local_Name (Arg_Internal);
2764
      end Process_Extended_Import_Export_Internal_Arg;
2765
 
2766
      --------------------------------------------------
2767
      -- Process_Extended_Import_Export_Object_Pragma --
2768
      --------------------------------------------------
2769
 
2770
      procedure Process_Extended_Import_Export_Object_Pragma
2771
        (Arg_Internal : Node_Id;
2772
         Arg_External : Node_Id;
2773
         Arg_Size     : Node_Id)
2774
      is
2775
         Def_Id : Entity_Id;
2776
 
2777
      begin
2778
         Process_Extended_Import_Export_Internal_Arg (Arg_Internal);
2779
         Def_Id := Entity (Arg_Internal);
2780
 
2781
         if Ekind (Def_Id) /= E_Constant
2782
           and then Ekind (Def_Id) /= E_Variable
2783
         then
2784
            Error_Pragma_Arg
2785
              ("pragma% must designate an object", Arg_Internal);
2786
         end if;
2787
 
2788
         if Has_Rep_Pragma (Def_Id, Name_Common_Object)
2789
              or else
2790
            Has_Rep_Pragma (Def_Id, Name_Psect_Object)
2791
         then
2792
            Error_Pragma_Arg
2793
              ("previous Common/Psect_Object applies, pragma % not permitted",
2794
               Arg_Internal);
2795
         end if;
2796
 
2797
         if Rep_Item_Too_Late (Def_Id, N) then
2798
            raise Pragma_Exit;
2799
         end if;
2800
 
2801
         Set_Extended_Import_Export_External_Name (Def_Id, Arg_External);
2802
 
2803
         if Present (Arg_Size) then
2804
            Check_Arg_Is_External_Name (Arg_Size);
2805
         end if;
2806
 
2807
         --  Export_Object case
2808
 
2809
         if Prag_Id = Pragma_Export_Object then
2810
            if not Is_Library_Level_Entity (Def_Id) then
2811
               Error_Pragma_Arg
2812
                 ("argument for pragma% must be library level entity",
2813
                  Arg_Internal);
2814
            end if;
2815
 
2816
            if Ekind (Current_Scope) = E_Generic_Package then
2817
               Error_Pragma ("pragma& cannot appear in a generic unit");
2818
            end if;
2819
 
2820
            if not Size_Known_At_Compile_Time (Etype (Def_Id)) then
2821
               Error_Pragma_Arg
2822
                 ("exported object must have compile time known size",
2823
                  Arg_Internal);
2824
            end if;
2825
 
2826
            if Warn_On_Export_Import and then Is_Exported (Def_Id) then
2827
               Error_Msg_N ("?duplicate Export_Object pragma", N);
2828
            else
2829
               Set_Exported (Def_Id, Arg_Internal);
2830
            end if;
2831
 
2832
         --  Import_Object case
2833
 
2834
         else
2835
            if Is_Concurrent_Type (Etype (Def_Id)) then
2836
               Error_Pragma_Arg
2837
                 ("cannot use pragma% for task/protected object",
2838
                  Arg_Internal);
2839
            end if;
2840
 
2841
            if Ekind (Def_Id) = E_Constant then
2842
               Error_Pragma_Arg
2843
                 ("cannot import a constant", Arg_Internal);
2844
            end if;
2845
 
2846
            if Warn_On_Export_Import
2847
              and then Has_Discriminants (Etype (Def_Id))
2848
            then
2849
               Error_Msg_N
2850
                 ("imported value must be initialized?", Arg_Internal);
2851
            end if;
2852
 
2853
            if Warn_On_Export_Import
2854
              and then Is_Access_Type (Etype (Def_Id))
2855
            then
2856
               Error_Pragma_Arg
2857
                 ("cannot import object of an access type?", Arg_Internal);
2858
            end if;
2859
 
2860
            if Warn_On_Export_Import
2861
              and then Is_Imported (Def_Id)
2862
            then
2863
               Error_Msg_N
2864
                 ("?duplicate Import_Object pragma", N);
2865
 
2866
            --  Check for explicit initialization present. Note that an
2867
            --  initialization generated by the code generator, e.g. for an
2868
            --  access type, does not count here.
2869
 
2870
            elsif Present (Expression (Parent (Def_Id)))
2871
               and then
2872
                 Comes_From_Source
2873
                   (Original_Node (Expression (Parent (Def_Id))))
2874
            then
2875
               Error_Msg_Sloc := Sloc (Def_Id);
2876
               Error_Pragma_Arg
2877
                 ("imported entities cannot be initialized (RM B.1(24))",
2878
                  "\no initialization allowed for & declared#", Arg1);
2879
            else
2880
               Set_Imported (Def_Id);
2881
               Note_Possible_Modification (Arg_Internal, Sure => False);
2882
            end if;
2883
         end if;
2884
      end Process_Extended_Import_Export_Object_Pragma;
2885
 
2886
      ------------------------------------------------------
2887
      -- Process_Extended_Import_Export_Subprogram_Pragma --
2888
      ------------------------------------------------------
2889
 
2890
      procedure Process_Extended_Import_Export_Subprogram_Pragma
2891
        (Arg_Internal                 : Node_Id;
2892
         Arg_External                 : Node_Id;
2893
         Arg_Parameter_Types          : Node_Id;
2894
         Arg_Result_Type              : Node_Id := Empty;
2895
         Arg_Mechanism                : Node_Id;
2896
         Arg_Result_Mechanism         : Node_Id := Empty;
2897
         Arg_First_Optional_Parameter : Node_Id := Empty)
2898
      is
2899
         Ent       : Entity_Id;
2900
         Def_Id    : Entity_Id;
2901
         Hom_Id    : Entity_Id;
2902
         Formal    : Entity_Id;
2903
         Ambiguous : Boolean;
2904
         Match     : Boolean;
2905
         Dval      : Node_Id;
2906
 
2907
         function Same_Base_Type
2908
          (Ptype  : Node_Id;
2909
           Formal : Entity_Id) return Boolean;
2910
         --  Determines if Ptype references the type of Formal. Note that only
2911
         --  the base types need to match according to the spec. Ptype here is
2912
         --  the argument from the pragma, which is either a type name, or an
2913
         --  access attribute.
2914
 
2915
         --------------------
2916
         -- Same_Base_Type --
2917
         --------------------
2918
 
2919
         function Same_Base_Type
2920
           (Ptype  : Node_Id;
2921
            Formal : Entity_Id) return Boolean
2922
         is
2923
            Ftyp : constant Entity_Id := Base_Type (Etype (Formal));
2924
            Pref : Node_Id;
2925
 
2926
         begin
2927
            --  Case where pragma argument is typ'Access
2928
 
2929
            if Nkind (Ptype) = N_Attribute_Reference
2930
              and then Attribute_Name (Ptype) = Name_Access
2931
            then
2932
               Pref := Prefix (Ptype);
2933
               Find_Type (Pref);
2934
 
2935
               if not Is_Entity_Name (Pref)
2936
                 or else Entity (Pref) = Any_Type
2937
               then
2938
                  raise Pragma_Exit;
2939
               end if;
2940
 
2941
               --  We have a match if the corresponding argument is of an
2942
               --  anonymous access type, and its designated type matches the
2943
               --  type of the prefix of the access attribute
2944
 
2945
               return Ekind (Ftyp) = E_Anonymous_Access_Type
2946
                 and then Base_Type (Entity (Pref)) =
2947
                            Base_Type (Etype (Designated_Type (Ftyp)));
2948
 
2949
            --  Case where pragma argument is a type name
2950
 
2951
            else
2952
               Find_Type (Ptype);
2953
 
2954
               if not Is_Entity_Name (Ptype)
2955
                 or else Entity (Ptype) = Any_Type
2956
               then
2957
                  raise Pragma_Exit;
2958
               end if;
2959
 
2960
               --  We have a match if the corresponding argument is of the type
2961
               --  given in the pragma (comparing base types)
2962
 
2963
               return Base_Type (Entity (Ptype)) = Ftyp;
2964
            end if;
2965
         end Same_Base_Type;
2966
 
2967
      --  Start of processing for
2968
      --  Process_Extended_Import_Export_Subprogram_Pragma
2969
 
2970
      begin
2971
         Process_Extended_Import_Export_Internal_Arg (Arg_Internal);
2972
         Ent := Empty;
2973
         Ambiguous := False;
2974
 
2975
         --  Loop through homonyms (overloadings) of the entity
2976
 
2977
         Hom_Id := Entity (Arg_Internal);
2978
         while Present (Hom_Id) loop
2979
            Def_Id := Get_Base_Subprogram (Hom_Id);
2980
 
2981
            --  We need a subprogram in the current scope
2982
 
2983
            if not Is_Subprogram (Def_Id)
2984
              or else Scope (Def_Id) /= Current_Scope
2985
            then
2986
               null;
2987
 
2988
            else
2989
               Match := True;
2990
 
2991
               --  Pragma cannot apply to subprogram body
2992
 
2993
               if Is_Subprogram (Def_Id)
2994
                 and then Nkind (Parent (Declaration_Node (Def_Id))) =
2995
                                                             N_Subprogram_Body
2996
               then
2997
                  Error_Pragma
2998
                    ("pragma% requires separate spec"
2999
                      & " and must come before body");
3000
               end if;
3001
 
3002
               --  Test result type if given, note that the result type
3003
               --  parameter can only be present for the function cases.
3004
 
3005
               if Present (Arg_Result_Type)
3006
                 and then not Same_Base_Type (Arg_Result_Type, Def_Id)
3007
               then
3008
                  Match := False;
3009
 
3010
               elsif Etype (Def_Id) /= Standard_Void_Type
3011
                 and then
3012
                   (Pname = Name_Export_Procedure
3013
                      or else
3014
                    Pname = Name_Import_Procedure)
3015
               then
3016
                  Match := False;
3017
 
3018
               --  Test parameter types if given. Note that this parameter
3019
               --  has not been analyzed (and must not be, since it is
3020
               --  semantic nonsense), so we get it as the parser left it.
3021
 
3022
               elsif Present (Arg_Parameter_Types) then
3023
                  Check_Matching_Types : declare
3024
                     Formal : Entity_Id;
3025
                     Ptype  : Node_Id;
3026
 
3027
                  begin
3028
                     Formal := First_Formal (Def_Id);
3029
 
3030
                     if Nkind (Arg_Parameter_Types) = N_Null then
3031
                        if Present (Formal) then
3032
                           Match := False;
3033
                        end if;
3034
 
3035
                     --  A list of one type, e.g. (List) is parsed as
3036
                     --  a parenthesized expression.
3037
 
3038
                     elsif Nkind (Arg_Parameter_Types) /= N_Aggregate
3039
                       and then Paren_Count (Arg_Parameter_Types) = 1
3040
                     then
3041
                        if No (Formal)
3042
                          or else Present (Next_Formal (Formal))
3043
                        then
3044
                           Match := False;
3045
                        else
3046
                           Match :=
3047
                             Same_Base_Type (Arg_Parameter_Types, Formal);
3048
                        end if;
3049
 
3050
                     --  A list of more than one type is parsed as a aggregate
3051
 
3052
                     elsif Nkind (Arg_Parameter_Types) = N_Aggregate
3053
                       and then Paren_Count (Arg_Parameter_Types) = 0
3054
                     then
3055
                        Ptype := First (Expressions (Arg_Parameter_Types));
3056
                        while Present (Ptype) or else Present (Formal) loop
3057
                           if No (Ptype)
3058
                             or else No (Formal)
3059
                             or else not Same_Base_Type (Ptype, Formal)
3060
                           then
3061
                              Match := False;
3062
                              exit;
3063
                           else
3064
                              Next_Formal (Formal);
3065
                              Next (Ptype);
3066
                           end if;
3067
                        end loop;
3068
 
3069
                     --  Anything else is of the wrong form
3070
 
3071
                     else
3072
                        Error_Pragma_Arg
3073
                          ("wrong form for Parameter_Types parameter",
3074
                           Arg_Parameter_Types);
3075
                     end if;
3076
                  end Check_Matching_Types;
3077
               end if;
3078
 
3079
               --  Match is now False if the entry we found did not match
3080
               --  either a supplied Parameter_Types or Result_Types argument
3081
 
3082
               if Match then
3083
                  if No (Ent) then
3084
                     Ent := Def_Id;
3085
 
3086
                  --  Ambiguous case, the flag Ambiguous shows if we already
3087
                  --  detected this and output the initial messages.
3088
 
3089
                  else
3090
                     if not Ambiguous then
3091
                        Ambiguous := True;
3092
                        Error_Msg_Name_1 := Pname;
3093
                        Error_Msg_N
3094
                          ("pragma% does not uniquely identify subprogram!",
3095
                           N);
3096
                        Error_Msg_Sloc := Sloc (Ent);
3097
                        Error_Msg_N ("matching subprogram #!", N);
3098
                        Ent := Empty;
3099
                     end if;
3100
 
3101
                     Error_Msg_Sloc := Sloc (Def_Id);
3102
                     Error_Msg_N ("matching subprogram #!", N);
3103
                  end if;
3104
               end if;
3105
            end if;
3106
 
3107
            Hom_Id := Homonym (Hom_Id);
3108
         end loop;
3109
 
3110
         --  See if we found an entry
3111
 
3112
         if No (Ent) then
3113
            if not Ambiguous then
3114
               if Is_Generic_Subprogram (Entity (Arg_Internal)) then
3115
                  Error_Pragma
3116
                    ("pragma% cannot be given for generic subprogram");
3117
               else
3118
                  Error_Pragma
3119
                    ("pragma% does not identify local subprogram");
3120
               end if;
3121
            end if;
3122
 
3123
            return;
3124
         end if;
3125
 
3126
         --  Import pragmas must be for imported entities
3127
 
3128
         if Prag_Id = Pragma_Import_Function
3129
              or else
3130
            Prag_Id = Pragma_Import_Procedure
3131
              or else
3132
            Prag_Id = Pragma_Import_Valued_Procedure
3133
         then
3134
            if not Is_Imported (Ent) then
3135
               Error_Pragma -- CODEFIX???
3136
                 ("pragma Import or Interface must precede pragma%");
3137
            end if;
3138
 
3139
         --  Here we have the Export case which can set the entity as exported
3140
 
3141
         --  But does not do so if the specified external name is null, since
3142
         --  that is taken as a signal in DEC Ada 83 (with which we want to be
3143
         --  compatible) to request no external name.
3144
 
3145
         elsif Nkind (Arg_External) = N_String_Literal
3146
           and then String_Length (Strval (Arg_External)) = 0
3147
         then
3148
            null;
3149
 
3150
         --  In all other cases, set entity as exported
3151
 
3152
         else
3153
            Set_Exported (Ent, Arg_Internal);
3154
         end if;
3155
 
3156
         --  Special processing for Valued_Procedure cases
3157
 
3158
         if Prag_Id = Pragma_Import_Valued_Procedure
3159
           or else
3160
            Prag_Id = Pragma_Export_Valued_Procedure
3161
         then
3162
            Formal := First_Formal (Ent);
3163
 
3164
            if No (Formal) then
3165
               Error_Pragma ("at least one parameter required for pragma%");
3166
 
3167
            elsif Ekind (Formal) /= E_Out_Parameter then
3168
               Error_Pragma ("first parameter must have mode out for pragma%");
3169
 
3170
            else
3171
               Set_Is_Valued_Procedure (Ent);
3172
            end if;
3173
         end if;
3174
 
3175
         Set_Extended_Import_Export_External_Name (Ent, Arg_External);
3176
 
3177
         --  Process Result_Mechanism argument if present. We have already
3178
         --  checked that this is only allowed for the function case.
3179
 
3180
         if Present (Arg_Result_Mechanism) then
3181
            Set_Mechanism_Value (Ent, Arg_Result_Mechanism);
3182
         end if;
3183
 
3184
         --  Process Mechanism parameter if present. Note that this parameter
3185
         --  is not analyzed, and must not be analyzed since it is semantic
3186
         --  nonsense, so we get it in exactly as the parser left it.
3187
 
3188
         if Present (Arg_Mechanism) then
3189
            declare
3190
               Formal : Entity_Id;
3191
               Massoc : Node_Id;
3192
               Mname  : Node_Id;
3193
               Choice : Node_Id;
3194
 
3195
            begin
3196
               --  A single mechanism association without a formal parameter
3197
               --  name is parsed as a parenthesized expression. All other
3198
               --  cases are parsed as aggregates, so we rewrite the single
3199
               --  parameter case as an aggregate for consistency.
3200
 
3201
               if Nkind (Arg_Mechanism) /= N_Aggregate
3202
                 and then Paren_Count (Arg_Mechanism) = 1
3203
               then
3204
                  Rewrite (Arg_Mechanism,
3205
                    Make_Aggregate (Sloc (Arg_Mechanism),
3206
                      Expressions => New_List (
3207
                        Relocate_Node (Arg_Mechanism))));
3208
               end if;
3209
 
3210
               --  Case of only mechanism name given, applies to all formals
3211
 
3212
               if Nkind (Arg_Mechanism) /= N_Aggregate then
3213
                  Formal := First_Formal (Ent);
3214
                  while Present (Formal) loop
3215
                     Set_Mechanism_Value (Formal, Arg_Mechanism);
3216
                     Next_Formal (Formal);
3217
                  end loop;
3218
 
3219
               --  Case of list of mechanism associations given
3220
 
3221
               else
3222
                  if Null_Record_Present (Arg_Mechanism) then
3223
                     Error_Pragma_Arg
3224
                       ("inappropriate form for Mechanism parameter",
3225
                        Arg_Mechanism);
3226
                  end if;
3227
 
3228
                  --  Deal with positional ones first
3229
 
3230
                  Formal := First_Formal (Ent);
3231
 
3232
                  if Present (Expressions (Arg_Mechanism)) then
3233
                     Mname := First (Expressions (Arg_Mechanism));
3234
                     while Present (Mname) loop
3235
                        if No (Formal) then
3236
                           Error_Pragma_Arg
3237
                             ("too many mechanism associations", Mname);
3238
                        end if;
3239
 
3240
                        Set_Mechanism_Value (Formal, Mname);
3241
                        Next_Formal (Formal);
3242
                        Next (Mname);
3243
                     end loop;
3244
                  end if;
3245
 
3246
                  --  Deal with named entries
3247
 
3248
                  if Present (Component_Associations (Arg_Mechanism)) then
3249
                     Massoc := First (Component_Associations (Arg_Mechanism));
3250
                     while Present (Massoc) loop
3251
                        Choice := First (Choices (Massoc));
3252
 
3253
                        if Nkind (Choice) /= N_Identifier
3254
                          or else Present (Next (Choice))
3255
                        then
3256
                           Error_Pragma_Arg
3257
                             ("incorrect form for mechanism association",
3258
                              Massoc);
3259
                        end if;
3260
 
3261
                        Formal := First_Formal (Ent);
3262
                        loop
3263
                           if No (Formal) then
3264
                              Error_Pragma_Arg
3265
                                ("parameter name & not present", Choice);
3266
                           end if;
3267
 
3268
                           if Chars (Choice) = Chars (Formal) then
3269
                              Set_Mechanism_Value
3270
                                (Formal, Expression (Massoc));
3271
 
3272
                              --  Set entity on identifier for ASIS
3273
 
3274
                              Set_Entity (Choice, Formal);
3275
 
3276
                              exit;
3277
                           end if;
3278
 
3279
                           Next_Formal (Formal);
3280
                        end loop;
3281
 
3282
                        Next (Massoc);
3283
                     end loop;
3284
                  end if;
3285
               end if;
3286
            end;
3287
         end if;
3288
 
3289
         --  Process First_Optional_Parameter argument if present. We have
3290
         --  already checked that this is only allowed for the Import case.
3291
 
3292
         if Present (Arg_First_Optional_Parameter) then
3293
            if Nkind (Arg_First_Optional_Parameter) /= N_Identifier then
3294
               Error_Pragma_Arg
3295
                 ("first optional parameter must be formal parameter name",
3296
                  Arg_First_Optional_Parameter);
3297
            end if;
3298
 
3299
            Formal := First_Formal (Ent);
3300
            loop
3301
               if No (Formal) then
3302
                  Error_Pragma_Arg
3303
                    ("specified formal parameter& not found",
3304
                     Arg_First_Optional_Parameter);
3305
               end if;
3306
 
3307
               exit when Chars (Formal) =
3308
                         Chars (Arg_First_Optional_Parameter);
3309
 
3310
               Next_Formal (Formal);
3311
            end loop;
3312
 
3313
            Set_First_Optional_Parameter (Ent, Formal);
3314
 
3315
            --  Check specified and all remaining formals have right form
3316
 
3317
            while Present (Formal) loop
3318
               if Ekind (Formal) /= E_In_Parameter then
3319
                  Error_Msg_NE
3320
                    ("optional formal& is not of mode in!",
3321
                     Arg_First_Optional_Parameter, Formal);
3322
 
3323
               else
3324
                  Dval := Default_Value (Formal);
3325
 
3326
                  if No (Dval) then
3327
                     Error_Msg_NE
3328
                       ("optional formal& does not have default value!",
3329
                        Arg_First_Optional_Parameter, Formal);
3330
 
3331
                  elsif Compile_Time_Known_Value_Or_Aggr (Dval) then
3332
                     null;
3333
 
3334
                  else
3335
                     Error_Msg_FE
3336
                       ("default value for optional formal& is non-static!",
3337
                        Arg_First_Optional_Parameter, Formal);
3338
                  end if;
3339
               end if;
3340
 
3341
               Set_Is_Optional_Parameter (Formal);
3342
               Next_Formal (Formal);
3343
            end loop;
3344
         end if;
3345
      end Process_Extended_Import_Export_Subprogram_Pragma;
3346
 
3347
      --------------------------
3348
      -- Process_Generic_List --
3349
      --------------------------
3350
 
3351
      procedure Process_Generic_List is
3352
         Arg : Node_Id;
3353
         Exp : Node_Id;
3354
 
3355
      begin
3356
         Check_No_Identifiers;
3357
         Check_At_Least_N_Arguments (1);
3358
 
3359
         Arg := Arg1;
3360
         while Present (Arg) loop
3361
            Exp := Expression (Arg);
3362
            Analyze (Exp);
3363
 
3364
            if not Is_Entity_Name (Exp)
3365
              or else
3366
                (not Is_Generic_Instance (Entity (Exp))
3367
                  and then
3368
                 not Is_Generic_Unit (Entity (Exp)))
3369
            then
3370
               Error_Pragma_Arg
3371
                 ("pragma% argument must be name of generic unit/instance",
3372
                  Arg);
3373
            end if;
3374
 
3375
            Next (Arg);
3376
         end loop;
3377
      end Process_Generic_List;
3378
 
3379
      ---------------------------------
3380
      -- Process_Import_Or_Interface --
3381
      ---------------------------------
3382
 
3383
      procedure Process_Import_Or_Interface is
3384
         C      : Convention_Id;
3385
         Def_Id : Entity_Id;
3386
         Hom_Id : Entity_Id;
3387
 
3388
      begin
3389
         Process_Convention (C, Def_Id);
3390
         Kill_Size_Check_Code (Def_Id);
3391
         Note_Possible_Modification (Expression (Arg2), Sure => False);
3392
 
3393
         if Ekind (Def_Id) = E_Variable
3394
              or else
3395
            Ekind (Def_Id) = E_Constant
3396
         then
3397
            --  We do not permit Import to apply to a renaming declaration
3398
 
3399
            if Present (Renamed_Object (Def_Id)) then
3400
               Error_Pragma_Arg
3401
                 ("pragma% not allowed for object renaming", Arg2);
3402
 
3403
            --  User initialization is not allowed for imported object, but
3404
            --  the object declaration may contain a default initialization,
3405
            --  that will be discarded. Note that an explicit initialization
3406
            --  only counts if it comes from source, otherwise it is simply
3407
            --  the code generator making an implicit initialization explicit.
3408
 
3409
            elsif Present (Expression (Parent (Def_Id)))
3410
              and then Comes_From_Source (Expression (Parent (Def_Id)))
3411
            then
3412
               Error_Msg_Sloc := Sloc (Def_Id);
3413
               Error_Pragma_Arg
3414
                 ("no initialization allowed for declaration of& #",
3415
                  "\imported entities cannot be initialized (RM B.1(24))",
3416
                  Arg2);
3417
 
3418
            else
3419
               Set_Imported (Def_Id);
3420
               Process_Interface_Name (Def_Id, Arg3, Arg4);
3421
 
3422
               --  Note that we do not set Is_Public here. That's because we
3423
               --  only want to set it if there is no address clause, and we
3424
               --  don't know that yet, so we delay that processing till
3425
               --  freeze time.
3426
 
3427
               --  pragma Import completes deferred constants
3428
 
3429
               if Ekind (Def_Id) = E_Constant then
3430
                  Set_Has_Completion (Def_Id);
3431
               end if;
3432
 
3433
               --  It is not possible to import a constant of an unconstrained
3434
               --  array type (e.g. string) because there is no simple way to
3435
               --  write a meaningful subtype for it.
3436
 
3437
               if Is_Array_Type (Etype (Def_Id))
3438
                 and then not Is_Constrained (Etype (Def_Id))
3439
               then
3440
                  Error_Msg_NE
3441
                    ("imported constant& must have a constrained subtype",
3442
                      N, Def_Id);
3443
               end if;
3444
            end if;
3445
 
3446
         elsif Is_Subprogram (Def_Id)
3447
           or else Is_Generic_Subprogram (Def_Id)
3448
         then
3449
            --  If the name is overloaded, pragma applies to all of the
3450
            --  denoted entities in the same declarative part.
3451
 
3452
            Hom_Id := Def_Id;
3453
            while Present (Hom_Id) loop
3454
               Def_Id := Get_Base_Subprogram (Hom_Id);
3455
 
3456
               --  Ignore inherited subprograms because the pragma will
3457
               --  apply to the parent operation, which is the one called.
3458
 
3459
               if Is_Overloadable (Def_Id)
3460
                 and then Present (Alias (Def_Id))
3461
               then
3462
                  null;
3463
 
3464
               --  If it is not a subprogram, it must be in an outer scope and
3465
               --  pragma does not apply.
3466
 
3467
               elsif not Is_Subprogram (Def_Id)
3468
                 and then not Is_Generic_Subprogram (Def_Id)
3469
               then
3470
                  null;
3471
 
3472
               --  Verify that the homonym is in the same declarative part (not
3473
               --  just the same scope).
3474
 
3475
               elsif Parent (Unit_Declaration_Node (Def_Id)) /= Parent (N)
3476
                 and then Nkind (Parent (N)) /= N_Compilation_Unit_Aux
3477
               then
3478
                  exit;
3479
 
3480
               else
3481
                  Set_Imported (Def_Id);
3482
 
3483
                  --  Reject an Import applied to an abstract subprogram
3484
 
3485
                  if Is_Subprogram (Def_Id)
3486
                    and then Is_Abstract_Subprogram (Def_Id)
3487
                  then
3488
                     Error_Msg_Sloc := Sloc (Def_Id);
3489
                     Error_Msg_NE
3490
                       ("cannot import abstract subprogram& declared#",
3491
                        Arg2, Def_Id);
3492
                  end if;
3493
 
3494
                  --  Special processing for Convention_Intrinsic
3495
 
3496
                  if C = Convention_Intrinsic then
3497
 
3498
                     --  Link_Name argument not allowed for intrinsic
3499
 
3500
                     if Present (Arg3)
3501
                       and then Chars (Arg3) = Name_Link_Name
3502
                     then
3503
                        Arg4 := Arg3;
3504
                     end if;
3505
 
3506
                     if Present (Arg4) then
3507
                        Error_Pragma_Arg
3508
                          ("Link_Name argument not allowed for " &
3509
                           "Import Intrinsic",
3510
                           Arg4);
3511
                     end if;
3512
 
3513
                     Set_Is_Intrinsic_Subprogram (Def_Id);
3514
 
3515
                     --  If no external name is present, then check that this
3516
                     --  is a valid intrinsic subprogram. If an external name
3517
                     --  is present, then this is handled by the back end.
3518
 
3519
                     if No (Arg3) then
3520
                        Check_Intrinsic_Subprogram (Def_Id, Expression (Arg2));
3521
                     end if;
3522
                  end if;
3523
 
3524
                  --  All interfaced procedures need an external symbol created
3525
                  --  for them since they are always referenced from another
3526
                  --  object file.
3527
 
3528
                  Set_Is_Public (Def_Id);
3529
 
3530
                  --  Verify that the subprogram does not have a completion
3531
                  --  through a renaming declaration. For other completions the
3532
                  --  pragma appears as a too late representation.
3533
 
3534
                  declare
3535
                     Decl : constant Node_Id := Unit_Declaration_Node (Def_Id);
3536
 
3537
                  begin
3538
                     if Present (Decl)
3539
                       and then Nkind (Decl) = N_Subprogram_Declaration
3540
                       and then Present (Corresponding_Body (Decl))
3541
                       and then Nkind (Unit_Declaration_Node
3542
                                        (Corresponding_Body (Decl))) =
3543
                                             N_Subprogram_Renaming_Declaration
3544
                     then
3545
                        Error_Msg_Sloc := Sloc (Def_Id);
3546
                        Error_Msg_NE
3547
                          ("cannot import&, renaming already provided for " &
3548
                           "declaration #", N, Def_Id);
3549
                     end if;
3550
                  end;
3551
 
3552
                  Set_Has_Completion (Def_Id);
3553
                  Process_Interface_Name (Def_Id, Arg3, Arg4);
3554
               end if;
3555
 
3556
               if Is_Compilation_Unit (Hom_Id) then
3557
 
3558
                  --  Its possible homonyms are not affected by the pragma.
3559
                  --  Such homonyms might be present in the context of other
3560
                  --  units being compiled.
3561
 
3562
                  exit;
3563
 
3564
               else
3565
                  Hom_Id := Homonym (Hom_Id);
3566
               end if;
3567
            end loop;
3568
 
3569
         --  When the convention is Java or CIL, we also allow Import to be
3570
         --  given for packages, generic packages, exceptions, record
3571
         --  components, and access to subprograms.
3572
 
3573
         elsif (C = Convention_Java or else C = Convention_CIL)
3574
           and then
3575
             (Is_Package_Or_Generic_Package (Def_Id)
3576
               or else Ekind (Def_Id) = E_Exception
3577
               or else Ekind (Def_Id) = E_Access_Subprogram_Type
3578
               or else Nkind (Parent (Def_Id)) = N_Component_Declaration)
3579
         then
3580
            Set_Imported (Def_Id);
3581
            Set_Is_Public (Def_Id);
3582
            Process_Interface_Name (Def_Id, Arg3, Arg4);
3583
 
3584
         --  Import a CPP class
3585
 
3586
         elsif Is_Record_Type (Def_Id)
3587
           and then C = Convention_CPP
3588
         then
3589
            --  Types treated as CPP classes are treated as limited, but we
3590
            --  don't require them to be declared this way. A warning is
3591
            --  issued to encourage the user to declare them as limited.
3592
            --  This is not an error, for compatibility reasons, because
3593
            --  these types have been supported this way for some time.
3594
 
3595
            if not Is_Limited_Type (Def_Id) then
3596
               Error_Msg_N
3597
                 ("imported 'C'P'P type should be " &
3598
                    "explicitly declared limited?",
3599
                  Get_Pragma_Arg (Arg2));
3600
               Error_Msg_N
3601
                 ("\type will be considered limited",
3602
                  Get_Pragma_Arg (Arg2));
3603
            end if;
3604
 
3605
            Set_Is_CPP_Class (Def_Id);
3606
            Set_Is_Limited_Record (Def_Id);
3607
 
3608
            --  Imported CPP types must not have discriminants (because C++
3609
            --  classes do not have discriminants).
3610
 
3611
            if Has_Discriminants (Def_Id) then
3612
               Error_Msg_N
3613
                 ("imported 'C'P'P type cannot have discriminants",
3614
                  First (Discriminant_Specifications
3615
                          (Declaration_Node (Def_Id))));
3616
            end if;
3617
 
3618
            --  Components of imported CPP types must not have default
3619
            --  expressions because the constructor (if any) is on the
3620
            --  C++ side.
3621
 
3622
            declare
3623
               Tdef  : constant Node_Id :=
3624
                         Type_Definition (Declaration_Node (Def_Id));
3625
               Clist : Node_Id;
3626
               Comp  : Node_Id;
3627
 
3628
            begin
3629
               if Nkind (Tdef) = N_Record_Definition then
3630
                  Clist := Component_List (Tdef);
3631
 
3632
               else
3633
                  pragma Assert (Nkind (Tdef) = N_Derived_Type_Definition);
3634
                  Clist := Component_List (Record_Extension_Part (Tdef));
3635
               end if;
3636
 
3637
               if Present (Clist) then
3638
                  Comp := First (Component_Items (Clist));
3639
                  while Present (Comp) loop
3640
                     if Present (Expression (Comp)) then
3641
                        Error_Msg_N
3642
                          ("component of imported 'C'P'P type cannot have" &
3643
                           " default expression", Expression (Comp));
3644
                     end if;
3645
 
3646
                     Next (Comp);
3647
                  end loop;
3648
               end if;
3649
            end;
3650
 
3651
         else
3652
            Error_Pragma_Arg
3653
              ("second argument of pragma% must be object or subprogram",
3654
               Arg2);
3655
         end if;
3656
 
3657
         --  If this pragma applies to a compilation unit, then the unit, which
3658
         --  is a subprogram, does not require (or allow) a body. We also do
3659
         --  not need to elaborate imported procedures.
3660
 
3661
         if Nkind (Parent (N)) = N_Compilation_Unit_Aux then
3662
            declare
3663
               Cunit : constant Node_Id := Parent (Parent (N));
3664
            begin
3665
               Set_Body_Required (Cunit, False);
3666
            end;
3667
         end if;
3668
      end Process_Import_Or_Interface;
3669
 
3670
      --------------------
3671
      -- Process_Inline --
3672
      --------------------
3673
 
3674
      procedure Process_Inline (Active : Boolean) is
3675
         Assoc     : Node_Id;
3676
         Decl      : Node_Id;
3677
         Subp_Id   : Node_Id;
3678
         Subp      : Entity_Id;
3679
         Applies   : Boolean;
3680
         Effective : Boolean := False;
3681
 
3682
         procedure Make_Inline (Subp : Entity_Id);
3683
         --  Subp is the defining unit name of the subprogram declaration. Set
3684
         --  the flag, as well as the flag in the corresponding body, if there
3685
         --  is one present.
3686
 
3687
         procedure Set_Inline_Flags (Subp : Entity_Id);
3688
         --  Sets Is_Inlined and Has_Pragma_Inline flags for Subp and also
3689
         --  Has_Pragma_Inline_Always for the Inline_Always case.
3690
 
3691
         function Inlining_Not_Possible (Subp : Entity_Id) return Boolean;
3692
         --  Returns True if it can be determined at this stage that inlining
3693
         --  is not possible, for example if the body is available and contains
3694
         --  exception handlers, we prevent inlining, since otherwise we can
3695
         --  get undefined symbols at link time. This function also emits a
3696
         --  warning if front-end inlining is enabled and the pragma appears
3697
         --  too late.
3698
         --
3699
         --  ??? is business with link symbols still valid, or does it relate
3700
         --  to front end ZCX which is being phased out ???
3701
 
3702
         ---------------------------
3703
         -- Inlining_Not_Possible --
3704
         ---------------------------
3705
 
3706
         function Inlining_Not_Possible (Subp : Entity_Id) return Boolean is
3707
            Decl  : constant Node_Id := Unit_Declaration_Node (Subp);
3708
            Stats : Node_Id;
3709
 
3710
         begin
3711
            if Nkind (Decl) = N_Subprogram_Body then
3712
               Stats := Handled_Statement_Sequence (Decl);
3713
               return Present (Exception_Handlers (Stats))
3714
                 or else Present (At_End_Proc (Stats));
3715
 
3716
            elsif Nkind (Decl) = N_Subprogram_Declaration
3717
              and then Present (Corresponding_Body (Decl))
3718
            then
3719
               if Front_End_Inlining
3720
                 and then Analyzed (Corresponding_Body (Decl))
3721
               then
3722
                  Error_Msg_N ("pragma appears too late, ignored?", N);
3723
                  return True;
3724
 
3725
               --  If the subprogram is a renaming as body, the body is just a
3726
               --  call to the renamed subprogram, and inlining is trivially
3727
               --  possible.
3728
 
3729
               elsif
3730
                 Nkind (Unit_Declaration_Node (Corresponding_Body (Decl))) =
3731
                                             N_Subprogram_Renaming_Declaration
3732
               then
3733
                  return False;
3734
 
3735
               else
3736
                  Stats :=
3737
                    Handled_Statement_Sequence
3738
                        (Unit_Declaration_Node (Corresponding_Body (Decl)));
3739
 
3740
                  return
3741
                    Present (Exception_Handlers (Stats))
3742
                      or else Present (At_End_Proc (Stats));
3743
               end if;
3744
 
3745
            else
3746
               --  If body is not available, assume the best, the check is
3747
               --  performed again when compiling enclosing package bodies.
3748
 
3749
               return False;
3750
            end if;
3751
         end Inlining_Not_Possible;
3752
 
3753
         -----------------
3754
         -- Make_Inline --
3755
         -----------------
3756
 
3757
         procedure Make_Inline (Subp : Entity_Id) is
3758
            Kind       : constant Entity_Kind := Ekind (Subp);
3759
            Inner_Subp : Entity_Id   := Subp;
3760
 
3761
         begin
3762
            --  Ignore if bad type, avoid cascaded error
3763
 
3764
            if Etype (Subp) = Any_Type then
3765
               Applies := True;
3766
               return;
3767
 
3768
            --  Ignore if all inlining is suppressed
3769
 
3770
            elsif Suppress_All_Inlining then
3771
               Applies := True;
3772
               return;
3773
 
3774
            --  If inlining is not possible, for now do not treat as an error
3775
 
3776
            elsif Inlining_Not_Possible (Subp) then
3777
               Applies := True;
3778
               return;
3779
 
3780
            --  Here we have a candidate for inlining, but we must exclude
3781
            --  derived operations. Otherwise we would end up trying to inline
3782
            --  a phantom declaration, and the result would be to drag in a
3783
            --  body which has no direct inlining associated with it. That
3784
            --  would not only be inefficient but would also result in the
3785
            --  backend doing cross-unit inlining in cases where it was
3786
            --  definitely inappropriate to do so.
3787
 
3788
            --  However, a simple Comes_From_Source test is insufficient, since
3789
            --  we do want to allow inlining of generic instances which also do
3790
            --  not come from source. We also need to recognize specs generated
3791
            --  by the front-end for bodies that carry the pragma. Finally,
3792
            --  predefined operators do not come from source but are not
3793
            --  inlineable either.
3794
 
3795
            elsif Is_Generic_Instance (Subp)
3796
              or else Nkind (Parent (Parent (Subp))) = N_Subprogram_Declaration
3797
            then
3798
               null;
3799
 
3800
            elsif not Comes_From_Source (Subp)
3801
              and then Scope (Subp) /= Standard_Standard
3802
            then
3803
               Applies := True;
3804
               return;
3805
            end if;
3806
 
3807
            --  The referenced entity must either be the enclosing entity, or
3808
            --  an entity declared within the current open scope.
3809
 
3810
            if Present (Scope (Subp))
3811
              and then Scope (Subp) /= Current_Scope
3812
              and then Subp /= Current_Scope
3813
            then
3814
               Error_Pragma_Arg
3815
                 ("argument of% must be entity in current scope", Assoc);
3816
               return;
3817
            end if;
3818
 
3819
            --  Processing for procedure, operator or function. If subprogram
3820
            --  is aliased (as for an instance) indicate that the renamed
3821
            --  entity (if declared in the same unit) is inlined.
3822
 
3823
            if Is_Subprogram (Subp) then
3824
               while Present (Alias (Inner_Subp)) loop
3825
                  Inner_Subp := Alias (Inner_Subp);
3826
               end loop;
3827
 
3828
               if In_Same_Source_Unit (Subp, Inner_Subp) then
3829
                  Set_Inline_Flags (Inner_Subp);
3830
 
3831
                  Decl := Parent (Parent (Inner_Subp));
3832
 
3833
                  if Nkind (Decl) = N_Subprogram_Declaration
3834
                    and then Present (Corresponding_Body (Decl))
3835
                  then
3836
                     Set_Inline_Flags (Corresponding_Body (Decl));
3837
 
3838
                  elsif Is_Generic_Instance (Subp) then
3839
 
3840
                     --  Indicate that the body needs to be created for
3841
                     --  inlining subsequent calls. The instantiation node
3842
                     --  follows the declaration of the wrapper package
3843
                     --  created for it.
3844
 
3845
                     if Scope (Subp) /= Standard_Standard
3846
                       and then
3847
                         Need_Subprogram_Instance_Body
3848
                          (Next (Unit_Declaration_Node (Scope (Alias (Subp)))),
3849
                              Subp)
3850
                     then
3851
                        null;
3852
                     end if;
3853
                  end if;
3854
               end if;
3855
 
3856
               Applies := True;
3857
 
3858
            --  For a generic subprogram set flag as well, for use at the point
3859
            --  of instantiation, to determine whether the body should be
3860
            --  generated.
3861
 
3862
            elsif Is_Generic_Subprogram (Subp) then
3863
               Set_Inline_Flags (Subp);
3864
               Applies := True;
3865
 
3866
            --  Literals are by definition inlined
3867
 
3868
            elsif Kind = E_Enumeration_Literal then
3869
               null;
3870
 
3871
            --  Anything else is an error
3872
 
3873
            else
3874
               Error_Pragma_Arg
3875
                 ("expect subprogram name for pragma%", Assoc);
3876
            end if;
3877
         end Make_Inline;
3878
 
3879
         ----------------------
3880
         -- Set_Inline_Flags --
3881
         ----------------------
3882
 
3883
         procedure Set_Inline_Flags (Subp : Entity_Id) is
3884
         begin
3885
            if Active then
3886
               Set_Is_Inlined (Subp, True);
3887
            end if;
3888
 
3889
            if not Has_Pragma_Inline (Subp) then
3890
               Set_Has_Pragma_Inline (Subp);
3891
               Effective := True;
3892
            end if;
3893
 
3894
            if Prag_Id = Pragma_Inline_Always then
3895
               Set_Has_Pragma_Inline_Always (Subp);
3896
            end if;
3897
         end Set_Inline_Flags;
3898
 
3899
      --  Start of processing for Process_Inline
3900
 
3901
      begin
3902
         Check_No_Identifiers;
3903
         Check_At_Least_N_Arguments (1);
3904
 
3905
         if Active then
3906
            Inline_Processing_Required := True;
3907
         end if;
3908
 
3909
         Assoc := Arg1;
3910
         while Present (Assoc) loop
3911
            Subp_Id := Expression (Assoc);
3912
            Analyze (Subp_Id);
3913
            Applies := False;
3914
 
3915
            if Is_Entity_Name (Subp_Id) then
3916
               Subp := Entity (Subp_Id);
3917
 
3918
               if Subp = Any_Id then
3919
 
3920
                  --  If previous error, avoid cascaded errors
3921
 
3922
                  Applies := True;
3923
                  Effective := True;
3924
 
3925
               else
3926
                  Make_Inline (Subp);
3927
 
3928
                  while Present (Homonym (Subp))
3929
                    and then Scope (Homonym (Subp)) = Current_Scope
3930
                  loop
3931
                     Make_Inline (Homonym (Subp));
3932
                     Subp := Homonym (Subp);
3933
                  end loop;
3934
               end if;
3935
            end if;
3936
 
3937
            if not Applies then
3938
               Error_Pragma_Arg
3939
                 ("inappropriate argument for pragma%", Assoc);
3940
 
3941
            elsif not Effective
3942
              and then Warn_On_Redundant_Constructs
3943
              and then not Suppress_All_Inlining
3944
            then
3945
               if Inlining_Not_Possible (Subp) then
3946
                  Error_Msg_NE
3947
                    ("pragma Inline for& is ignored?", N, Entity (Subp_Id));
3948
               else
3949
                  Error_Msg_NE
3950
                    ("pragma Inline for& is redundant?", N, Entity (Subp_Id));
3951
               end if;
3952
            end if;
3953
 
3954
            Next (Assoc);
3955
         end loop;
3956
      end Process_Inline;
3957
 
3958
      ----------------------------
3959
      -- Process_Interface_Name --
3960
      ----------------------------
3961
 
3962
      procedure Process_Interface_Name
3963
        (Subprogram_Def : Entity_Id;
3964
         Ext_Arg        : Node_Id;
3965
         Link_Arg       : Node_Id)
3966
      is
3967
         Ext_Nam    : Node_Id;
3968
         Link_Nam   : Node_Id;
3969
         String_Val : String_Id;
3970
 
3971
         procedure Check_Form_Of_Interface_Name
3972
           (SN            : Node_Id;
3973
            Ext_Name_Case : Boolean);
3974
         --  SN is a string literal node for an interface name. This routine
3975
         --  performs some minimal checks that the name is reasonable. In
3976
         --  particular that no spaces or other obviously incorrect characters
3977
         --  appear. This is only a warning, since any characters are allowed.
3978
         --  Ext_Name_Case is True for an External_Name, False for a Link_Name.
3979
 
3980
         ----------------------------------
3981
         -- Check_Form_Of_Interface_Name --
3982
         ----------------------------------
3983
 
3984
         procedure Check_Form_Of_Interface_Name
3985
           (SN            : Node_Id;
3986
            Ext_Name_Case : Boolean)
3987
         is
3988
            S  : constant String_Id := Strval (Expr_Value_S (SN));
3989
            SL : constant Nat       := String_Length (S);
3990
            C  : Char_Code;
3991
 
3992
         begin
3993
            if SL = 0 then
3994
               Error_Msg_N ("interface name cannot be null string", SN);
3995
            end if;
3996
 
3997
            for J in 1 .. SL loop
3998
               C := Get_String_Char (S, J);
3999
 
4000
               --  Look for dubious character and issue unconditional warning.
4001
               --  Definitely dubious if not in character range.
4002
 
4003
               if not In_Character_Range (C)
4004
 
4005
                  --  For all cases except CLI target,
4006
                  --  commas, spaces and slashes are dubious (in CLI, we use
4007
                  --  commas and backslashes in external names to specify
4008
                  --  assembly version and public key, while slashes and spaces
4009
                  --  can be used in names to mark nested classes and
4010
                  --  valuetypes).
4011
 
4012
                  or else ((not Ext_Name_Case or else VM_Target /= CLI_Target)
4013
                             and then (Get_Character (C) = ','
4014
                                         or else
4015
                                       Get_Character (C) = '\'))
4016
                 or else (VM_Target /= CLI_Target
4017
                            and then (Get_Character (C) = ' '
4018
                                        or else
4019
                                      Get_Character (C) = '/'))
4020
               then
4021
                  Error_Msg
4022
                    ("?interface name contains illegal character",
4023
                     Sloc (SN) + Source_Ptr (J));
4024
               end if;
4025
            end loop;
4026
         end Check_Form_Of_Interface_Name;
4027
 
4028
      --  Start of processing for Process_Interface_Name
4029
 
4030
      begin
4031
         if No (Link_Arg) then
4032
            if No (Ext_Arg) then
4033
               if VM_Target = CLI_Target
4034
                 and then Ekind (Subprogram_Def) = E_Package
4035
                 and then Nkind (Parent (Subprogram_Def)) =
4036
                                                 N_Package_Specification
4037
                 and then Present (Generic_Parent (Parent (Subprogram_Def)))
4038
               then
4039
                  Set_Interface_Name
4040
                     (Subprogram_Def,
4041
                      Interface_Name
4042
                        (Generic_Parent (Parent (Subprogram_Def))));
4043
               end if;
4044
 
4045
               return;
4046
 
4047
            elsif Chars (Ext_Arg) = Name_Link_Name then
4048
               Ext_Nam  := Empty;
4049
               Link_Nam := Expression (Ext_Arg);
4050
 
4051
            else
4052
               Check_Optional_Identifier (Ext_Arg, Name_External_Name);
4053
               Ext_Nam  := Expression (Ext_Arg);
4054
               Link_Nam := Empty;
4055
            end if;
4056
 
4057
         else
4058
            Check_Optional_Identifier (Ext_Arg,  Name_External_Name);
4059
            Check_Optional_Identifier (Link_Arg, Name_Link_Name);
4060
            Ext_Nam  := Expression (Ext_Arg);
4061
            Link_Nam := Expression (Link_Arg);
4062
         end if;
4063
 
4064
         --  Check expressions for external name and link name are static
4065
 
4066
         if Present (Ext_Nam) then
4067
            Check_Arg_Is_Static_Expression (Ext_Nam, Standard_String);
4068
            Check_Form_Of_Interface_Name (Ext_Nam, Ext_Name_Case => True);
4069
 
4070
            --  Verify that external name is not the name of a local entity,
4071
            --  which would hide the imported one and could lead to run-time
4072
            --  surprises. The problem can only arise for entities declared in
4073
            --  a package body (otherwise the external name is fully qualified
4074
            --  and will not conflict).
4075
 
4076
            declare
4077
               Nam : Name_Id;
4078
               E   : Entity_Id;
4079
               Par : Node_Id;
4080
 
4081
            begin
4082
               if Prag_Id = Pragma_Import then
4083
                  String_To_Name_Buffer (Strval (Expr_Value_S (Ext_Nam)));
4084
                  Nam := Name_Find;
4085
                  E   := Entity_Id (Get_Name_Table_Info (Nam));
4086
 
4087
                  if Nam /= Chars (Subprogram_Def)
4088
                    and then Present (E)
4089
                    and then not Is_Overloadable (E)
4090
                    and then Is_Immediately_Visible (E)
4091
                    and then not Is_Imported (E)
4092
                    and then Ekind (Scope (E)) = E_Package
4093
                  then
4094
                     Par := Parent (E);
4095
                     while Present (Par) loop
4096
                        if Nkind (Par) = N_Package_Body then
4097
                           Error_Msg_Sloc := Sloc (E);
4098
                           Error_Msg_NE
4099
                             ("imported entity is hidden by & declared#",
4100
                              Ext_Arg, E);
4101
                           exit;
4102
                        end if;
4103
 
4104
                        Par := Parent (Par);
4105
                     end loop;
4106
                  end if;
4107
               end if;
4108
            end;
4109
         end if;
4110
 
4111
         if Present (Link_Nam) then
4112
            Check_Arg_Is_Static_Expression (Link_Nam, Standard_String);
4113
            Check_Form_Of_Interface_Name (Link_Nam, Ext_Name_Case => False);
4114
         end if;
4115
 
4116
         --  If there is no link name, just set the external name
4117
 
4118
         if No (Link_Nam) then
4119
            Link_Nam := Adjust_External_Name_Case (Expr_Value_S (Ext_Nam));
4120
 
4121
         --  For the Link_Name case, the given literal is preceded by an
4122
         --  asterisk, which indicates to GCC that the given name should be
4123
         --  taken literally, and in particular that no prepending of
4124
         --  underlines should occur, even in systems where this is the
4125
         --  normal default.
4126
 
4127
         else
4128
            Start_String;
4129
 
4130
            if VM_Target = No_VM then
4131
               Store_String_Char (Get_Char_Code ('*'));
4132
            end if;
4133
 
4134
            String_Val := Strval (Expr_Value_S (Link_Nam));
4135
            Store_String_Chars (String_Val);
4136
            Link_Nam :=
4137
              Make_String_Literal (Sloc (Link_Nam),
4138
                Strval => End_String);
4139
         end if;
4140
 
4141
         Set_Encoded_Interface_Name
4142
           (Get_Base_Subprogram (Subprogram_Def), Link_Nam);
4143
         Check_Duplicated_Export_Name (Link_Nam);
4144
      end Process_Interface_Name;
4145
 
4146
      -----------------------------------------
4147
      -- Process_Interrupt_Or_Attach_Handler --
4148
      -----------------------------------------
4149
 
4150
      procedure Process_Interrupt_Or_Attach_Handler is
4151
         Arg1_X       : constant Node_Id   := Expression (Arg1);
4152
         Handler_Proc : constant Entity_Id := Entity (Arg1_X);
4153
         Proc_Scope   : constant Entity_Id := Scope (Handler_Proc);
4154
 
4155
      begin
4156
         Set_Is_Interrupt_Handler (Handler_Proc);
4157
 
4158
         --  If the pragma is not associated with a handler procedure within a
4159
         --  protected type, then it must be for a nonprotected procedure for
4160
         --  the AAMP target, in which case we don't associate a representation
4161
         --  item with the procedure's scope.
4162
 
4163
         if Ekind (Proc_Scope) = E_Protected_Type then
4164
            if Prag_Id = Pragma_Interrupt_Handler
4165
                 or else
4166
               Prag_Id = Pragma_Attach_Handler
4167
            then
4168
               Record_Rep_Item (Proc_Scope, N);
4169
            end if;
4170
         end if;
4171
      end Process_Interrupt_Or_Attach_Handler;
4172
 
4173
      --------------------------------------------------
4174
      -- Process_Restrictions_Or_Restriction_Warnings --
4175
      --------------------------------------------------
4176
 
4177
      --  Note: some of the simple identifier cases were handled in par-prag,
4178
      --  but it is harmless (and more straightforward) to simply handle all
4179
      --  cases here, even if it means we repeat a bit of work in some cases.
4180
 
4181
      procedure Process_Restrictions_Or_Restriction_Warnings
4182
        (Warn : Boolean)
4183
      is
4184
         Arg   : Node_Id;
4185
         R_Id  : Restriction_Id;
4186
         Id    : Name_Id;
4187
         Expr  : Node_Id;
4188
         Val   : Uint;
4189
 
4190
         procedure Check_Unit_Name (N : Node_Id);
4191
         --  Checks unit name parameter for No_Dependence. Returns if it has
4192
         --  an appropriate form, otherwise raises pragma argument error.
4193
 
4194
         ---------------------
4195
         -- Check_Unit_Name --
4196
         ---------------------
4197
 
4198
         procedure Check_Unit_Name (N : Node_Id) is
4199
         begin
4200
            if Nkind (N) = N_Selected_Component then
4201
               Check_Unit_Name (Prefix (N));
4202
               Check_Unit_Name (Selector_Name (N));
4203
 
4204
            elsif Nkind (N) = N_Identifier then
4205
               return;
4206
 
4207
            else
4208
               Error_Pragma_Arg
4209
                 ("wrong form for unit name for No_Dependence", N);
4210
            end if;
4211
         end Check_Unit_Name;
4212
 
4213
      --  Start of processing for Process_Restrictions_Or_Restriction_Warnings
4214
 
4215
      begin
4216
         Check_Ada_83_Warning;
4217
         Check_At_Least_N_Arguments (1);
4218
         Check_Valid_Configuration_Pragma;
4219
 
4220
         Arg := Arg1;
4221
         while Present (Arg) loop
4222
            Id := Chars (Arg);
4223
            Expr := Expression (Arg);
4224
 
4225
            --  Case of no restriction identifier present
4226
 
4227
            if Id = No_Name then
4228
               if Nkind (Expr) /= N_Identifier then
4229
                  Error_Pragma_Arg
4230
                    ("invalid form for restriction", Arg);
4231
               end if;
4232
 
4233
               R_Id :=
4234
                 Get_Restriction_Id
4235
                   (Process_Restriction_Synonyms (Expr));
4236
 
4237
               if R_Id not in All_Boolean_Restrictions then
4238
                  Error_Msg_Name_1 := Pname;
4239
                  Error_Msg_N
4240
                    ("invalid restriction identifier&", Get_Pragma_Arg (Arg));
4241
 
4242
                  --  Check for possible misspelling
4243
 
4244
                  for J in Restriction_Id loop
4245
                     declare
4246
                        Rnm : constant String := Restriction_Id'Image (J);
4247
 
4248
                     begin
4249
                        Name_Buffer (1 .. Rnm'Length) := Rnm;
4250
                        Name_Len := Rnm'Length;
4251
                        Set_Casing (All_Lower_Case);
4252
 
4253
                        if Is_Bad_Spelling_Of (Chars (Expr), Name_Enter) then
4254
                           Set_Casing
4255
                             (Identifier_Casing (Current_Source_File));
4256
                           Error_Msg_String (1 .. Rnm'Length) :=
4257
                             Name_Buffer (1 .. Name_Len);
4258
                           Error_Msg_Strlen := Rnm'Length;
4259
                           Error_Msg_N -- CODEFIX
4260
                             ("\possible misspelling of ""~""",
4261
                              Get_Pragma_Arg (Arg));
4262
                           exit;
4263
                        end if;
4264
                     end;
4265
                  end loop;
4266
 
4267
                  raise Pragma_Exit;
4268
               end if;
4269
 
4270
               if Implementation_Restriction (R_Id) then
4271
                  Check_Restriction (No_Implementation_Restrictions, Arg);
4272
               end if;
4273
 
4274
               --  If this is a warning, then set the warning unless we already
4275
               --  have a real restriction active (we never want a warning to
4276
               --  override a real restriction).
4277
 
4278
               if Warn then
4279
                  if not Restriction_Active (R_Id) then
4280
                     Set_Restriction (R_Id, N);
4281
                     Restriction_Warnings (R_Id) := True;
4282
                  end if;
4283
 
4284
               --  If real restriction case, then set it and make sure that the
4285
               --  restriction warning flag is off, since a real restriction
4286
               --  always overrides a warning.
4287
 
4288
               else
4289
                  Set_Restriction (R_Id, N);
4290
                  Restriction_Warnings (R_Id) := False;
4291
               end if;
4292
 
4293
               --  A very special case that must be processed here: pragma
4294
               --  Restrictions (No_Exceptions) turns off all run-time
4295
               --  checking. This is a bit dubious in terms of the formal
4296
               --  language definition, but it is what is intended by RM
4297
               --  H.4(12). Restriction_Warnings never affects generated code
4298
               --  so this is done only in the real restriction case.
4299
 
4300
               if R_Id = No_Exceptions and then not Warn then
4301
                  Scope_Suppress := (others => True);
4302
               end if;
4303
 
4304
            --  Case of No_Dependence => unit-name. Note that the parser
4305
            --  already made the necessary entry in the No_Dependence table.
4306
 
4307
            elsif Id = Name_No_Dependence then
4308
               Check_Unit_Name (Expr);
4309
 
4310
            --  All other cases of restriction identifier present
4311
 
4312
            else
4313
               R_Id := Get_Restriction_Id (Process_Restriction_Synonyms (Arg));
4314
               Analyze_And_Resolve (Expr, Any_Integer);
4315
 
4316
               if R_Id not in All_Parameter_Restrictions then
4317
                  Error_Pragma_Arg
4318
                    ("invalid restriction parameter identifier", Arg);
4319
 
4320
               elsif not Is_OK_Static_Expression (Expr) then
4321
                  Flag_Non_Static_Expr
4322
                    ("value must be static expression!", Expr);
4323
                  raise Pragma_Exit;
4324
 
4325
               elsif not Is_Integer_Type (Etype (Expr))
4326
                 or else Expr_Value (Expr) < 0
4327
               then
4328
                  Error_Pragma_Arg
4329
                    ("value must be non-negative integer", Arg);
4330
               end if;
4331
 
4332
               --  Restriction pragma is active
4333
 
4334
               Val := Expr_Value (Expr);
4335
 
4336
               if not UI_Is_In_Int_Range (Val) then
4337
                  Error_Pragma_Arg
4338
                    ("pragma ignored, value too large?", Arg);
4339
               end if;
4340
 
4341
               --  Warning case. If the real restriction is active, then we
4342
               --  ignore the request, since warning never overrides a real
4343
               --  restriction. Otherwise we set the proper warning. Note that
4344
               --  this circuit sets the warning again if it is already set,
4345
               --  which is what we want, since the constant may have changed.
4346
 
4347
               if Warn then
4348
                  if not Restriction_Active (R_Id) then
4349
                     Set_Restriction
4350
                       (R_Id, N, Integer (UI_To_Int (Val)));
4351
                     Restriction_Warnings (R_Id) := True;
4352
                  end if;
4353
 
4354
               --  Real restriction case, set restriction and make sure warning
4355
               --  flag is off since real restriction always overrides warning.
4356
 
4357
               else
4358
                  Set_Restriction (R_Id, N, Integer (UI_To_Int (Val)));
4359
                  Restriction_Warnings (R_Id) := False;
4360
               end if;
4361
            end if;
4362
 
4363
            Next (Arg);
4364
         end loop;
4365
      end Process_Restrictions_Or_Restriction_Warnings;
4366
 
4367
      ---------------------------------
4368
      -- Process_Suppress_Unsuppress --
4369
      ---------------------------------
4370
 
4371
      --  Note: this procedure makes entries in the check suppress data
4372
      --  structures managed by Sem. See spec of package Sem for full
4373
      --  details on how we handle recording of check suppression.
4374
 
4375
      procedure Process_Suppress_Unsuppress (Suppress_Case : Boolean) is
4376
         C    : Check_Id;
4377
         E_Id : Node_Id;
4378
         E    : Entity_Id;
4379
 
4380
         In_Package_Spec : constant Boolean :=
4381
                             Is_Package_Or_Generic_Package (Current_Scope)
4382
                               and then not In_Package_Body (Current_Scope);
4383
 
4384
         procedure Suppress_Unsuppress_Echeck (E : Entity_Id; C : Check_Id);
4385
         --  Used to suppress a single check on the given entity
4386
 
4387
         --------------------------------
4388
         -- Suppress_Unsuppress_Echeck --
4389
         --------------------------------
4390
 
4391
         procedure Suppress_Unsuppress_Echeck (E : Entity_Id; C : Check_Id) is
4392
         begin
4393
            Set_Checks_May_Be_Suppressed (E);
4394
 
4395
            if In_Package_Spec then
4396
               Push_Global_Suppress_Stack_Entry
4397
                 (Entity   => E,
4398
                  Check    => C,
4399
                  Suppress => Suppress_Case);
4400
 
4401
            else
4402
               Push_Local_Suppress_Stack_Entry
4403
                 (Entity   => E,
4404
                  Check    => C,
4405
                  Suppress => Suppress_Case);
4406
            end if;
4407
 
4408
            --  If this is a first subtype, and the base type is distinct,
4409
            --  then also set the suppress flags on the base type.
4410
 
4411
            if Is_First_Subtype (E)
4412
              and then Etype (E) /= E
4413
            then
4414
               Suppress_Unsuppress_Echeck (Etype (E), C);
4415
            end if;
4416
         end Suppress_Unsuppress_Echeck;
4417
 
4418
      --  Start of processing for Process_Suppress_Unsuppress
4419
 
4420
      begin
4421
         --  Suppress/Unsuppress can appear as a configuration pragma, or in a
4422
         --  declarative part or a package spec (RM 11.5(5)).
4423
 
4424
         if not Is_Configuration_Pragma then
4425
            Check_Is_In_Decl_Part_Or_Package_Spec;
4426
         end if;
4427
 
4428
         Check_At_Least_N_Arguments (1);
4429
         Check_At_Most_N_Arguments (2);
4430
         Check_No_Identifier (Arg1);
4431
         Check_Arg_Is_Identifier (Arg1);
4432
 
4433
         C := Get_Check_Id (Chars (Expression (Arg1)));
4434
 
4435
         if C = No_Check_Id then
4436
            Error_Pragma_Arg
4437
              ("argument of pragma% is not valid check name", Arg1);
4438
         end if;
4439
 
4440
         if not Suppress_Case
4441
           and then (C = All_Checks or else C = Overflow_Check)
4442
         then
4443
            Opt.Overflow_Checks_Unsuppressed := True;
4444
         end if;
4445
 
4446
         if Arg_Count = 1 then
4447
 
4448
            --  Make an entry in the local scope suppress table. This is the
4449
            --  table that directly shows the current value of the scope
4450
            --  suppress check for any check id value.
4451
 
4452
            if C = All_Checks then
4453
 
4454
               --  For All_Checks, we set all specific predefined checks with
4455
               --  the exception of Elaboration_Check, which is handled
4456
               --  specially because of not wanting All_Checks to have the
4457
               --  effect of deactivating static elaboration order processing.
4458
 
4459
               for J in Scope_Suppress'Range loop
4460
                  if J /= Elaboration_Check then
4461
                     Scope_Suppress (J) := Suppress_Case;
4462
                  end if;
4463
               end loop;
4464
 
4465
            --  If not All_Checks, and predefined check, then set appropriate
4466
            --  scope entry. Note that we will set Elaboration_Check if this
4467
            --  is explicitly specified.
4468
 
4469
            elsif C in Predefined_Check_Id then
4470
               Scope_Suppress (C) := Suppress_Case;
4471
            end if;
4472
 
4473
            --  Also make an entry in the Local_Entity_Suppress table
4474
 
4475
            Push_Local_Suppress_Stack_Entry
4476
              (Entity   => Empty,
4477
               Check    => C,
4478
               Suppress => Suppress_Case);
4479
 
4480
         --  Case of two arguments present, where the check is suppressed for
4481
         --  a specified entity (given as the second argument of the pragma)
4482
 
4483
         else
4484
            Check_Optional_Identifier (Arg2, Name_On);
4485
            E_Id := Expression (Arg2);
4486
            Analyze (E_Id);
4487
 
4488
            if not Is_Entity_Name (E_Id) then
4489
               Error_Pragma_Arg
4490
                 ("second argument of pragma% must be entity name", Arg2);
4491
            end if;
4492
 
4493
            E := Entity (E_Id);
4494
 
4495
            if E = Any_Id then
4496
               return;
4497
            end if;
4498
 
4499
            --  Enforce RM 11.5(7) which requires that for a pragma that
4500
            --  appears within a package spec, the named entity must be
4501
            --  within the package spec. We allow the package name itself
4502
            --  to be mentioned since that makes sense, although it is not
4503
            --  strictly allowed by 11.5(7).
4504
 
4505
            if In_Package_Spec
4506
              and then E /= Current_Scope
4507
              and then Scope (E) /= Current_Scope
4508
            then
4509
               Error_Pragma_Arg
4510
                 ("entity in pragma% is not in package spec (RM 11.5(7))",
4511
                  Arg2);
4512
            end if;
4513
 
4514
            --  Loop through homonyms. As noted below, in the case of a package
4515
            --  spec, only homonyms within the package spec are considered.
4516
 
4517
            loop
4518
               Suppress_Unsuppress_Echeck (E, C);
4519
 
4520
               if Is_Generic_Instance (E)
4521
                 and then Is_Subprogram (E)
4522
                 and then Present (Alias (E))
4523
               then
4524
                  Suppress_Unsuppress_Echeck (Alias (E), C);
4525
               end if;
4526
 
4527
               --  Move to next homonym
4528
 
4529
               E := Homonym (E);
4530
               exit when No (E);
4531
 
4532
               --  If we are within a package specification, the pragma only
4533
               --  applies to homonyms in the same scope.
4534
 
4535
               exit when In_Package_Spec
4536
                 and then Scope (E) /= Current_Scope;
4537
            end loop;
4538
         end if;
4539
      end Process_Suppress_Unsuppress;
4540
 
4541
      ------------------
4542
      -- Set_Exported --
4543
      ------------------
4544
 
4545
      procedure Set_Exported (E : Entity_Id; Arg : Node_Id) is
4546
      begin
4547
         if Is_Imported (E) then
4548
            Error_Pragma_Arg
4549
              ("cannot export entity& that was previously imported", Arg);
4550
 
4551
         elsif Present (Address_Clause (E)) then
4552
            Error_Pragma_Arg
4553
              ("cannot export entity& that has an address clause", Arg);
4554
         end if;
4555
 
4556
         Set_Is_Exported (E);
4557
 
4558
         --  Generate a reference for entity explicitly, because the
4559
         --  identifier may be overloaded and name resolution will not
4560
         --  generate one.
4561
 
4562
         Generate_Reference (E, Arg);
4563
 
4564
         --  Deal with exporting non-library level entity
4565
 
4566
         if not Is_Library_Level_Entity (E) then
4567
 
4568
            --  Not allowed at all for subprograms
4569
 
4570
            if Is_Subprogram (E) then
4571
               Error_Pragma_Arg ("local subprogram& cannot be exported", Arg);
4572
 
4573
            --  Otherwise set public and statically allocated
4574
 
4575
            else
4576
               Set_Is_Public (E);
4577
               Set_Is_Statically_Allocated (E);
4578
 
4579
               --  Warn if the corresponding W flag is set and the pragma comes
4580
               --  from source. The latter may not be true e.g. on VMS where we
4581
               --  expand export pragmas for exception codes associated with
4582
               --  imported or exported exceptions. We do not want to generate
4583
               --  a warning for something that the user did not write.
4584
 
4585
               if Warn_On_Export_Import
4586
                 and then Comes_From_Source (Arg)
4587
               then
4588
                  Error_Msg_NE
4589
                    ("?& has been made static as a result of Export", Arg, E);
4590
                  Error_Msg_N
4591
                    ("\this usage is non-standard and non-portable", Arg);
4592
               end if;
4593
            end if;
4594
         end if;
4595
 
4596
         if Warn_On_Export_Import and then Is_Type (E) then
4597
            Error_Msg_NE
4598
              ("exporting a type has no effect?", Arg, E);
4599
         end if;
4600
 
4601
         if Warn_On_Export_Import and Inside_A_Generic then
4602
            Error_Msg_NE
4603
              ("all instances of& will have the same external name?", Arg, E);
4604
         end if;
4605
      end Set_Exported;
4606
 
4607
      ----------------------------------------------
4608
      -- Set_Extended_Import_Export_External_Name --
4609
      ----------------------------------------------
4610
 
4611
      procedure Set_Extended_Import_Export_External_Name
4612
        (Internal_Ent : Entity_Id;
4613
         Arg_External : Node_Id)
4614
      is
4615
         Old_Name : constant Node_Id := Interface_Name (Internal_Ent);
4616
         New_Name : Node_Id;
4617
 
4618
      begin
4619
         if No (Arg_External) then
4620
            return;
4621
         end if;
4622
 
4623
         Check_Arg_Is_External_Name (Arg_External);
4624
 
4625
         if Nkind (Arg_External) = N_String_Literal then
4626
            if String_Length (Strval (Arg_External)) = 0 then
4627
               return;
4628
            else
4629
               New_Name := Adjust_External_Name_Case (Arg_External);
4630
            end if;
4631
 
4632
         elsif Nkind (Arg_External) = N_Identifier then
4633
            New_Name := Get_Default_External_Name (Arg_External);
4634
 
4635
         --  Check_Arg_Is_External_Name should let through only identifiers and
4636
         --  string literals or static string expressions (which are folded to
4637
         --  string literals).
4638
 
4639
         else
4640
            raise Program_Error;
4641
         end if;
4642
 
4643
         --  If we already have an external name set (by a prior normal Import
4644
         --  or Export pragma), then the external names must match
4645
 
4646
         if Present (Interface_Name (Internal_Ent)) then
4647
            Check_Matching_Internal_Names : declare
4648
               S1 : constant String_Id := Strval (Old_Name);
4649
               S2 : constant String_Id := Strval (New_Name);
4650
 
4651
               procedure Mismatch;
4652
               --  Called if names do not match
4653
 
4654
               --------------
4655
               -- Mismatch --
4656
               --------------
4657
 
4658
               procedure Mismatch is
4659
               begin
4660
                  Error_Msg_Sloc := Sloc (Old_Name);
4661
                  Error_Pragma_Arg
4662
                    ("external name does not match that given #",
4663
                     Arg_External);
4664
               end Mismatch;
4665
 
4666
            --  Start of processing for Check_Matching_Internal_Names
4667
 
4668
            begin
4669
               if String_Length (S1) /= String_Length (S2) then
4670
                  Mismatch;
4671
 
4672
               else
4673
                  for J in 1 .. String_Length (S1) loop
4674
                     if Get_String_Char (S1, J) /= Get_String_Char (S2, J) then
4675
                        Mismatch;
4676
                     end if;
4677
                  end loop;
4678
               end if;
4679
            end Check_Matching_Internal_Names;
4680
 
4681
         --  Otherwise set the given name
4682
 
4683
         else
4684
            Set_Encoded_Interface_Name (Internal_Ent, New_Name);
4685
            Check_Duplicated_Export_Name (New_Name);
4686
         end if;
4687
      end Set_Extended_Import_Export_External_Name;
4688
 
4689
      ------------------
4690
      -- Set_Imported --
4691
      ------------------
4692
 
4693
      procedure Set_Imported (E : Entity_Id) is
4694
      begin
4695
         --  Error message if already imported or exported
4696
 
4697
         if Is_Exported (E) or else Is_Imported (E) then
4698
            if Is_Exported (E) then
4699
               Error_Msg_NE ("entity& was previously exported", N, E);
4700
            else
4701
               Error_Msg_NE ("entity& was previously imported", N, E);
4702
            end if;
4703
 
4704
            Error_Msg_Name_1 := Pname;
4705
            Error_Msg_N
4706
              ("\(pragma% applies to all previous entities)", N);
4707
 
4708
            Error_Msg_Sloc  := Sloc (E);
4709
            Error_Msg_NE ("\import not allowed for& declared#", N, E);
4710
 
4711
         --  Here if not previously imported or exported, OK to import
4712
 
4713
         else
4714
            Set_Is_Imported (E);
4715
 
4716
            --  If the entity is an object that is not at the library level,
4717
            --  then it is statically allocated. We do not worry about objects
4718
            --  with address clauses in this context since they are not really
4719
            --  imported in the linker sense.
4720
 
4721
            if Is_Object (E)
4722
              and then not Is_Library_Level_Entity (E)
4723
              and then No (Address_Clause (E))
4724
            then
4725
               Set_Is_Statically_Allocated (E);
4726
            end if;
4727
         end if;
4728
      end Set_Imported;
4729
 
4730
      -------------------------
4731
      -- Set_Mechanism_Value --
4732
      -------------------------
4733
 
4734
      --  Note: the mechanism name has not been analyzed (and cannot indeed be
4735
      --  analyzed, since it is semantic nonsense), so we get it in the exact
4736
      --  form created by the parser.
4737
 
4738
      procedure Set_Mechanism_Value (Ent : Entity_Id; Mech_Name : Node_Id) is
4739
         Class : Node_Id;
4740
         Param : Node_Id;
4741
         Mech_Name_Id : Name_Id;
4742
 
4743
         procedure Bad_Class;
4744
         --  Signal bad descriptor class name
4745
 
4746
         procedure Bad_Mechanism;
4747
         --  Signal bad mechanism name
4748
 
4749
         ---------------
4750
         -- Bad_Class --
4751
         ---------------
4752
 
4753
         procedure Bad_Class is
4754
         begin
4755
            Error_Pragma_Arg ("unrecognized descriptor class name", Class);
4756
         end Bad_Class;
4757
 
4758
         -------------------------
4759
         -- Bad_Mechanism_Value --
4760
         -------------------------
4761
 
4762
         procedure Bad_Mechanism is
4763
         begin
4764
            Error_Pragma_Arg ("unrecognized mechanism name", Mech_Name);
4765
         end Bad_Mechanism;
4766
 
4767
      --  Start of processing for Set_Mechanism_Value
4768
 
4769
      begin
4770
         if Mechanism (Ent) /= Default_Mechanism then
4771
            Error_Msg_NE
4772
              ("mechanism for & has already been set", Mech_Name, Ent);
4773
         end if;
4774
 
4775
         --  MECHANISM_NAME ::= value | reference | descriptor |
4776
         --                     short_descriptor
4777
 
4778
         if Nkind (Mech_Name) = N_Identifier then
4779
            if Chars (Mech_Name) = Name_Value then
4780
               Set_Mechanism (Ent, By_Copy);
4781
               return;
4782
 
4783
            elsif Chars (Mech_Name) = Name_Reference then
4784
               Set_Mechanism (Ent, By_Reference);
4785
               return;
4786
 
4787
            elsif Chars (Mech_Name) = Name_Descriptor then
4788
               Check_VMS (Mech_Name);
4789
               Set_Mechanism (Ent, By_Descriptor);
4790
               return;
4791
 
4792
            elsif Chars (Mech_Name) = Name_Short_Descriptor then
4793
               Check_VMS (Mech_Name);
4794
               Set_Mechanism (Ent, By_Short_Descriptor);
4795
               return;
4796
 
4797
            elsif Chars (Mech_Name) = Name_Copy then
4798
               Error_Pragma_Arg
4799
                 ("bad mechanism name, Value assumed", Mech_Name);
4800
 
4801
            else
4802
               Bad_Mechanism;
4803
            end if;
4804
 
4805
         --  MECHANISM_NAME ::= descriptor (CLASS_NAME) |
4806
         --                     short_descriptor (CLASS_NAME)
4807
         --  CLASS_NAME     ::= ubs | ubsb | uba | s | sb | a | nca
4808
 
4809
         --  Note: this form is parsed as an indexed component
4810
 
4811
         elsif Nkind (Mech_Name) = N_Indexed_Component then
4812
 
4813
            Class := First (Expressions (Mech_Name));
4814
 
4815
            if Nkind (Prefix (Mech_Name)) /= N_Identifier
4816
             or else not (Chars (Prefix (Mech_Name)) = Name_Descriptor or else
4817
                          Chars (Prefix (Mech_Name)) = Name_Short_Descriptor)
4818
             or else Present (Next (Class))
4819
            then
4820
               Bad_Mechanism;
4821
            else
4822
               Mech_Name_Id := Chars (Prefix (Mech_Name));
4823
            end if;
4824
 
4825
         --  MECHANISM_NAME ::= descriptor (Class => CLASS_NAME) |
4826
         --                     short_descriptor (Class => CLASS_NAME)
4827
         --  CLASS_NAME     ::= ubs | ubsb | uba | s | sb | a | nca
4828
 
4829
         --  Note: this form is parsed as a function call
4830
 
4831
         elsif Nkind (Mech_Name) = N_Function_Call then
4832
 
4833
            Param := First (Parameter_Associations (Mech_Name));
4834
 
4835
            if Nkind (Name (Mech_Name)) /= N_Identifier
4836
              or else not (Chars (Name (Mech_Name)) = Name_Descriptor or else
4837
                           Chars (Name (Mech_Name)) = Name_Short_Descriptor)
4838
              or else Present (Next (Param))
4839
              or else No (Selector_Name (Param))
4840
              or else Chars (Selector_Name (Param)) /= Name_Class
4841
            then
4842
               Bad_Mechanism;
4843
            else
4844
               Class := Explicit_Actual_Parameter (Param);
4845
               Mech_Name_Id := Chars (Name (Mech_Name));
4846
            end if;
4847
 
4848
         else
4849
            Bad_Mechanism;
4850
         end if;
4851
 
4852
         --  Fall through here with Class set to descriptor class name
4853
 
4854
         Check_VMS (Mech_Name);
4855
 
4856
         if Nkind (Class) /= N_Identifier then
4857
            Bad_Class;
4858
 
4859
         elsif Mech_Name_Id = Name_Descriptor
4860
               and then Chars (Class) = Name_UBS
4861
         then
4862
            Set_Mechanism (Ent, By_Descriptor_UBS);
4863
 
4864
         elsif Mech_Name_Id = Name_Descriptor
4865
               and then Chars (Class) = Name_UBSB
4866
         then
4867
            Set_Mechanism (Ent, By_Descriptor_UBSB);
4868
 
4869
         elsif Mech_Name_Id = Name_Descriptor
4870
               and then Chars (Class) = Name_UBA
4871
         then
4872
            Set_Mechanism (Ent, By_Descriptor_UBA);
4873
 
4874
         elsif Mech_Name_Id = Name_Descriptor
4875
               and then Chars (Class) = Name_S
4876
         then
4877
            Set_Mechanism (Ent, By_Descriptor_S);
4878
 
4879
         elsif Mech_Name_Id = Name_Descriptor
4880
               and then Chars (Class) = Name_SB
4881
         then
4882
            Set_Mechanism (Ent, By_Descriptor_SB);
4883
 
4884
         elsif Mech_Name_Id = Name_Descriptor
4885
               and then Chars (Class) = Name_A
4886
         then
4887
            Set_Mechanism (Ent, By_Descriptor_A);
4888
 
4889
         elsif Mech_Name_Id = Name_Descriptor
4890
               and then Chars (Class) = Name_NCA
4891
         then
4892
            Set_Mechanism (Ent, By_Descriptor_NCA);
4893
 
4894
         elsif Mech_Name_Id = Name_Short_Descriptor
4895
               and then Chars (Class) = Name_UBS
4896
         then
4897
            Set_Mechanism (Ent, By_Short_Descriptor_UBS);
4898
 
4899
         elsif Mech_Name_Id = Name_Short_Descriptor
4900
               and then Chars (Class) = Name_UBSB
4901
         then
4902
            Set_Mechanism (Ent, By_Short_Descriptor_UBSB);
4903
 
4904
         elsif Mech_Name_Id = Name_Short_Descriptor
4905
               and then Chars (Class) = Name_UBA
4906
         then
4907
            Set_Mechanism (Ent, By_Short_Descriptor_UBA);
4908
 
4909
         elsif Mech_Name_Id = Name_Short_Descriptor
4910
               and then Chars (Class) = Name_S
4911
         then
4912
            Set_Mechanism (Ent, By_Short_Descriptor_S);
4913
 
4914
         elsif Mech_Name_Id = Name_Short_Descriptor
4915
               and then Chars (Class) = Name_SB
4916
         then
4917
            Set_Mechanism (Ent, By_Short_Descriptor_SB);
4918
 
4919
         elsif Mech_Name_Id = Name_Short_Descriptor
4920
               and then Chars (Class) = Name_A
4921
         then
4922
            Set_Mechanism (Ent, By_Short_Descriptor_A);
4923
 
4924
         elsif Mech_Name_Id = Name_Short_Descriptor
4925
               and then Chars (Class) = Name_NCA
4926
         then
4927
            Set_Mechanism (Ent, By_Short_Descriptor_NCA);
4928
 
4929
         else
4930
            Bad_Class;
4931
         end if;
4932
      end Set_Mechanism_Value;
4933
 
4934
      ---------------------------
4935
      -- Set_Ravenscar_Profile --
4936
      ---------------------------
4937
 
4938
      --  The tasks to be done here are
4939
 
4940
      --    Set required policies
4941
 
4942
      --      pragma Task_Dispatching_Policy (FIFO_Within_Priorities)
4943
      --      pragma Locking_Policy (Ceiling_Locking)
4944
 
4945
      --    Set Detect_Blocking mode
4946
 
4947
      --    Set required restrictions (see System.Rident for detailed list)
4948
 
4949
      procedure Set_Ravenscar_Profile (N : Node_Id) is
4950
      begin
4951
         --  pragma Task_Dispatching_Policy (FIFO_Within_Priorities)
4952
 
4953
         if Task_Dispatching_Policy /= ' '
4954
           and then Task_Dispatching_Policy /= 'F'
4955
         then
4956
            Error_Msg_Sloc := Task_Dispatching_Policy_Sloc;
4957
            Error_Pragma ("Profile (Ravenscar) incompatible with policy#");
4958
 
4959
         --  Set the FIFO_Within_Priorities policy, but always preserve
4960
         --  System_Location since we like the error message with the run time
4961
         --  name.
4962
 
4963
         else
4964
            Task_Dispatching_Policy := 'F';
4965
 
4966
            if Task_Dispatching_Policy_Sloc /= System_Location then
4967
               Task_Dispatching_Policy_Sloc := Loc;
4968
            end if;
4969
         end if;
4970
 
4971
         --  pragma Locking_Policy (Ceiling_Locking)
4972
 
4973
         if Locking_Policy /= ' '
4974
           and then Locking_Policy /= 'C'
4975
         then
4976
            Error_Msg_Sloc := Locking_Policy_Sloc;
4977
            Error_Pragma ("Profile (Ravenscar) incompatible with policy#");
4978
 
4979
         --  Set the Ceiling_Locking policy, but preserve System_Location since
4980
         --  we like the error message with the run time name.
4981
 
4982
         else
4983
            Locking_Policy := 'C';
4984
 
4985
            if Locking_Policy_Sloc /= System_Location then
4986
               Locking_Policy_Sloc := Loc;
4987
            end if;
4988
         end if;
4989
 
4990
         --  pragma Detect_Blocking
4991
 
4992
         Detect_Blocking := True;
4993
 
4994
         --  Set the corresponding restrictions
4995
 
4996
         Set_Profile_Restrictions
4997
           (Ravenscar, N, Warn => Treat_Restrictions_As_Warnings);
4998
      end Set_Ravenscar_Profile;
4999
 
5000
   --  Start of processing for Analyze_Pragma
5001
 
5002
   begin
5003
      --  Deal with unrecognized pragma
5004
 
5005
      if not Is_Pragma_Name (Pname) then
5006
         if Warn_On_Unrecognized_Pragma then
5007
            Error_Msg_Name_1 := Pname;
5008
            Error_Msg_N ("?unrecognized pragma%!", Pragma_Identifier (N));
5009
 
5010
            for PN in First_Pragma_Name .. Last_Pragma_Name loop
5011
               if Is_Bad_Spelling_Of (Pname, PN) then
5012
                  Error_Msg_Name_1 := PN;
5013
                  Error_Msg_N -- CODEFIX
5014
                    ("\?possible misspelling of %!", Pragma_Identifier (N));
5015
                  exit;
5016
               end if;
5017
            end loop;
5018
         end if;
5019
 
5020
         return;
5021
      end if;
5022
 
5023
      --  Here to start processing for recognized pragma
5024
 
5025
      Prag_Id := Get_Pragma_Id (Pname);
5026
 
5027
      --  Preset arguments
5028
 
5029
      Arg1 := Empty;
5030
      Arg2 := Empty;
5031
      Arg3 := Empty;
5032
      Arg4 := Empty;
5033
 
5034
      if Present (Pragma_Argument_Associations (N)) then
5035
         Arg1 := First (Pragma_Argument_Associations (N));
5036
 
5037
         if Present (Arg1) then
5038
            Arg2 := Next (Arg1);
5039
 
5040
            if Present (Arg2) then
5041
               Arg3 := Next (Arg2);
5042
 
5043
               if Present (Arg3) then
5044
                  Arg4 := Next (Arg3);
5045
               end if;
5046
            end if;
5047
         end if;
5048
      end if;
5049
 
5050
      --  Count number of arguments
5051
 
5052
      declare
5053
         Arg_Node : Node_Id;
5054
      begin
5055
         Arg_Count := 0;
5056
         Arg_Node := Arg1;
5057
         while Present (Arg_Node) loop
5058
            Arg_Count := Arg_Count + 1;
5059
            Next (Arg_Node);
5060
         end loop;
5061
      end;
5062
 
5063
      --  An enumeration type defines the pragmas that are supported by the
5064
      --  implementation. Get_Pragma_Id (in package Prag) transforms a name
5065
      --  into the corresponding enumeration value for the following case.
5066
 
5067
      case Prag_Id is
5068
 
5069
         -----------------
5070
         -- Abort_Defer --
5071
         -----------------
5072
 
5073
         --  pragma Abort_Defer;
5074
 
5075
         when Pragma_Abort_Defer =>
5076
            GNAT_Pragma;
5077
            Check_Arg_Count (0);
5078
 
5079
            --  The only required semantic processing is to check the
5080
            --  placement. This pragma must appear at the start of the
5081
            --  statement sequence of a handled sequence of statements.
5082
 
5083
            if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements
5084
              or else N /= First (Statements (Parent (N)))
5085
            then
5086
               Pragma_Misplaced;
5087
            end if;
5088
 
5089
         ------------
5090
         -- Ada_83 --
5091
         ------------
5092
 
5093
         --  pragma Ada_83;
5094
 
5095
         --  Note: this pragma also has some specific processing in Par.Prag
5096
         --  because we want to set the Ada version mode during parsing.
5097
 
5098
         when Pragma_Ada_83 =>
5099
            GNAT_Pragma;
5100
            Check_Arg_Count (0);
5101
 
5102
            --  We really should check unconditionally for proper configuration
5103
            --  pragma placement, since we really don't want mixed Ada modes
5104
            --  within a single unit, and the GNAT reference manual has always
5105
            --  said this was a configuration pragma, but we did not check and
5106
            --  are hesitant to add the check now.
5107
 
5108
            --  However, we really cannot tolerate mixing Ada 2005 with Ada 83
5109
            --  or Ada 95, so we must check if we are in Ada 2005 mode.
5110
 
5111
            if Ada_Version >= Ada_05 then
5112
               Check_Valid_Configuration_Pragma;
5113
            end if;
5114
 
5115
            --  Now set Ada 83 mode
5116
 
5117
            Ada_Version := Ada_83;
5118
            Ada_Version_Explicit := Ada_Version;
5119
 
5120
         ------------
5121
         -- Ada_95 --
5122
         ------------
5123
 
5124
         --  pragma Ada_95;
5125
 
5126
         --  Note: this pragma also has some specific processing in Par.Prag
5127
         --  because we want to set the Ada 83 version mode during parsing.
5128
 
5129
         when Pragma_Ada_95 =>
5130
            GNAT_Pragma;
5131
            Check_Arg_Count (0);
5132
 
5133
            --  We really should check unconditionally for proper configuration
5134
            --  pragma placement, since we really don't want mixed Ada modes
5135
            --  within a single unit, and the GNAT reference manual has always
5136
            --  said this was a configuration pragma, but we did not check and
5137
            --  are hesitant to add the check now.
5138
 
5139
            --  However, we really cannot tolerate mixing Ada 2005 with Ada 83
5140
            --  or Ada 95, so we must check if we are in Ada 2005 mode.
5141
 
5142
            if Ada_Version >= Ada_05 then
5143
               Check_Valid_Configuration_Pragma;
5144
            end if;
5145
 
5146
            --  Now set Ada 95 mode
5147
 
5148
            Ada_Version := Ada_95;
5149
            Ada_Version_Explicit := Ada_Version;
5150
 
5151
         ---------------------
5152
         -- Ada_05/Ada_2005 --
5153
         ---------------------
5154
 
5155
         --  pragma Ada_05;
5156
         --  pragma Ada_05 (LOCAL_NAME);
5157
 
5158
         --  pragma Ada_2005;
5159
         --  pragma Ada_2005 (LOCAL_NAME):
5160
 
5161
         --  Note: these pragma also have some specific processing in Par.Prag
5162
         --  because we want to set the Ada 2005 version mode during parsing.
5163
 
5164
         when Pragma_Ada_05 | Pragma_Ada_2005 => declare
5165
            E_Id : Node_Id;
5166
 
5167
         begin
5168
            GNAT_Pragma;
5169
 
5170
            if Arg_Count = 1 then
5171
               Check_Arg_Is_Local_Name (Arg1);
5172
               E_Id := Expression (Arg1);
5173
 
5174
               if Etype (E_Id) = Any_Type then
5175
                  return;
5176
               end if;
5177
 
5178
               Set_Is_Ada_2005_Only (Entity (E_Id));
5179
 
5180
            else
5181
               Check_Arg_Count (0);
5182
 
5183
               --  For Ada_2005 we unconditionally enforce the documented
5184
               --  configuration pragma placement, since we do not want to
5185
               --  tolerate mixed modes in a unit involving Ada 2005. That
5186
               --  would cause real difficulties for those cases where there
5187
               --  are incompatibilities between Ada 95 and Ada 2005.
5188
 
5189
               Check_Valid_Configuration_Pragma;
5190
 
5191
               --  Now set Ada 2005 mode
5192
 
5193
               Ada_Version := Ada_05;
5194
               Ada_Version_Explicit := Ada_05;
5195
            end if;
5196
         end;
5197
 
5198
         ----------------------
5199
         -- All_Calls_Remote --
5200
         ----------------------
5201
 
5202
         --  pragma All_Calls_Remote [(library_package_NAME)];
5203
 
5204
         when Pragma_All_Calls_Remote => All_Calls_Remote : declare
5205
            Lib_Entity : Entity_Id;
5206
 
5207
         begin
5208
            Check_Ada_83_Warning;
5209
            Check_Valid_Library_Unit_Pragma;
5210
 
5211
            if Nkind (N) = N_Null_Statement then
5212
               return;
5213
            end if;
5214
 
5215
            Lib_Entity := Find_Lib_Unit_Name;
5216
 
5217
            --  This pragma should only apply to a RCI unit (RM E.2.3(23))
5218
 
5219
            if Present (Lib_Entity)
5220
              and then not Debug_Flag_U
5221
            then
5222
               if not Is_Remote_Call_Interface (Lib_Entity) then
5223
                  Error_Pragma ("pragma% only apply to rci unit");
5224
 
5225
               --  Set flag for entity of the library unit
5226
 
5227
               else
5228
                  Set_Has_All_Calls_Remote (Lib_Entity);
5229
               end if;
5230
 
5231
            end if;
5232
         end All_Calls_Remote;
5233
 
5234
         --------------
5235
         -- Annotate --
5236
         --------------
5237
 
5238
         --  pragma Annotate (IDENTIFIER [, IDENTIFIER {, ARG}]);
5239
         --  ARG ::= NAME | EXPRESSION
5240
 
5241
         --  The first two arguments are by convention intended to refer to an
5242
         --  external tool and a tool-specific function. These arguments are
5243
         --  not analyzed.
5244
 
5245
         when Pragma_Annotate => Annotate : begin
5246
            GNAT_Pragma;
5247
            Check_At_Least_N_Arguments (1);
5248
            Check_Arg_Is_Identifier (Arg1);
5249
 
5250
            declare
5251
               Arg : Node_Id;
5252
               Exp : Node_Id;
5253
 
5254
            begin
5255
               --  Second unanalyzed parameter is optional
5256
 
5257
               if No (Arg2) then
5258
                  null;
5259
               else
5260
                  Arg := Next (Arg2);
5261
                  while Present (Arg) loop
5262
                     Exp := Expression (Arg);
5263
                     Analyze (Exp);
5264
 
5265
                     if Is_Entity_Name (Exp) then
5266
                        null;
5267
 
5268
                     --  For string literals, we assume Standard_String as the
5269
                     --  type, unless the string contains wide or wide_wide
5270
                     --  characters.
5271
 
5272
                     elsif Nkind (Exp) = N_String_Literal then
5273
                        if Has_Wide_Wide_Character (Exp) then
5274
                           Resolve (Exp, Standard_Wide_Wide_String);
5275
                        elsif Has_Wide_Character (Exp) then
5276
                           Resolve (Exp, Standard_Wide_String);
5277
                        else
5278
                           Resolve (Exp, Standard_String);
5279
                        end if;
5280
 
5281
                     elsif Is_Overloaded (Exp) then
5282
                           Error_Pragma_Arg
5283
                             ("ambiguous argument for pragma%", Exp);
5284
 
5285
                     else
5286
                        Resolve (Exp);
5287
                     end if;
5288
 
5289
                     Next (Arg);
5290
                  end loop;
5291
               end if;
5292
            end;
5293
         end Annotate;
5294
 
5295
         ------------
5296
         -- Assert --
5297
         ------------
5298
 
5299
         --  pragma Assert ([Check =>] Boolean_EXPRESSION
5300
         --                 [, [Message =>] Static_String_EXPRESSION]);
5301
 
5302
         when Pragma_Assert => Assert : declare
5303
            Expr : Node_Id;
5304
            Newa : List_Id;
5305
 
5306
         begin
5307
            Ada_2005_Pragma;
5308
            Check_At_Least_N_Arguments (1);
5309
            Check_At_Most_N_Arguments (2);
5310
            Check_Arg_Order ((Name_Check, Name_Message));
5311
            Check_Optional_Identifier (Arg1, Name_Check);
5312
 
5313
            --  We treat pragma Assert as equivalent to:
5314
 
5315
            --    pragma Check (Assertion, condition [, msg]);
5316
 
5317
            --  So rewrite pragma in this manner, and analyze the result
5318
 
5319
            Expr := Get_Pragma_Arg (Arg1);
5320
            Newa := New_List (
5321
              Make_Pragma_Argument_Association (Loc,
5322
                Expression =>
5323
                  Make_Identifier (Loc,
5324
                    Chars => Name_Assertion)),
5325
 
5326
              Make_Pragma_Argument_Association (Sloc (Expr),
5327
                Expression => Expr));
5328
 
5329
            if Arg_Count > 1 then
5330
               Check_Optional_Identifier (Arg2, Name_Message);
5331
               Analyze_And_Resolve (Get_Pragma_Arg (Arg2), Standard_String);
5332
               Append_To (Newa, Relocate_Node (Arg2));
5333
            end if;
5334
 
5335
            Rewrite (N,
5336
              Make_Pragma (Loc,
5337
                Chars => Name_Check,
5338
                Pragma_Argument_Associations => Newa));
5339
            Analyze (N);
5340
         end Assert;
5341
 
5342
         ----------------------
5343
         -- Assertion_Policy --
5344
         ----------------------
5345
 
5346
         --  pragma Assertion_Policy (Check | Ignore)
5347
 
5348
         when Pragma_Assertion_Policy => Assertion_Policy : declare
5349
            Policy : Node_Id;
5350
 
5351
         begin
5352
            Ada_2005_Pragma;
5353
            Check_Valid_Configuration_Pragma;
5354
            Check_Arg_Count (1);
5355
            Check_No_Identifiers;
5356
            Check_Arg_Is_One_Of (Arg1, Name_Check, Name_Ignore);
5357
 
5358
            --  We treat pragma Assertion_Policy as equivalent to:
5359
 
5360
            --    pragma Check_Policy (Assertion, policy)
5361
 
5362
            --  So rewrite the pragma in that manner and link on to the chain
5363
            --  of Check_Policy pragmas, marking the pragma as analyzed.
5364
 
5365
            Policy := Get_Pragma_Arg (Arg1);
5366
 
5367
            Rewrite (N,
5368
              Make_Pragma (Loc,
5369
                Chars => Name_Check_Policy,
5370
 
5371
                Pragma_Argument_Associations => New_List (
5372
                  Make_Pragma_Argument_Association (Loc,
5373
                    Expression =>
5374
                      Make_Identifier (Loc,
5375
                        Chars => Name_Assertion)),
5376
 
5377
                  Make_Pragma_Argument_Association (Loc,
5378
                    Expression =>
5379
                      Make_Identifier (Sloc (Policy),
5380
                        Chars => Chars (Policy))))));
5381
 
5382
            Set_Analyzed (N);
5383
            Set_Next_Pragma (N, Opt.Check_Policy_List);
5384
            Opt.Check_Policy_List := N;
5385
         end Assertion_Policy;
5386
 
5387
         ------------------------------
5388
         -- Assume_No_Invalid_Values --
5389
         ------------------------------
5390
 
5391
         --  pragma Assume_No_Invalid_Values (On | Off);
5392
 
5393
         when Pragma_Assume_No_Invalid_Values =>
5394
            GNAT_Pragma;
5395
            Check_Valid_Configuration_Pragma;
5396
            Check_Arg_Count (1);
5397
            Check_No_Identifiers;
5398
            Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
5399
 
5400
            if Chars (Expression (Arg1)) = Name_On then
5401
               Assume_No_Invalid_Values := True;
5402
            else
5403
               Assume_No_Invalid_Values := False;
5404
            end if;
5405
 
5406
         ---------------
5407
         -- AST_Entry --
5408
         ---------------
5409
 
5410
         --  pragma AST_Entry (entry_IDENTIFIER);
5411
 
5412
         when Pragma_AST_Entry => AST_Entry : declare
5413
            Ent : Node_Id;
5414
 
5415
         begin
5416
            GNAT_Pragma;
5417
            Check_VMS (N);
5418
            Check_Arg_Count (1);
5419
            Check_No_Identifiers;
5420
            Check_Arg_Is_Local_Name (Arg1);
5421
            Ent := Entity (Expression (Arg1));
5422
 
5423
            --  Note: the implementation of the AST_Entry pragma could handle
5424
            --  the entry family case fine, but for now we are consistent with
5425
            --  the DEC rules, and do not allow the pragma, which of course
5426
            --  has the effect of also forbidding the attribute.
5427
 
5428
            if Ekind (Ent) /= E_Entry then
5429
               Error_Pragma_Arg
5430
                 ("pragma% argument must be simple entry name", Arg1);
5431
 
5432
            elsif Is_AST_Entry (Ent) then
5433
               Error_Pragma_Arg
5434
                 ("duplicate % pragma for entry", Arg1);
5435
 
5436
            elsif Has_Homonym (Ent) then
5437
               Error_Pragma_Arg
5438
                 ("pragma% argument cannot specify overloaded entry", Arg1);
5439
 
5440
            else
5441
               declare
5442
                  FF : constant Entity_Id := First_Formal (Ent);
5443
 
5444
               begin
5445
                  if Present (FF) then
5446
                     if Present (Next_Formal (FF)) then
5447
                        Error_Pragma_Arg
5448
                          ("entry for pragma% can have only one argument",
5449
                           Arg1);
5450
 
5451
                     elsif Parameter_Mode (FF) /= E_In_Parameter then
5452
                        Error_Pragma_Arg
5453
                          ("entry parameter for pragma% must have mode IN",
5454
                           Arg1);
5455
                     end if;
5456
                  end if;
5457
               end;
5458
 
5459
               Set_Is_AST_Entry (Ent);
5460
            end if;
5461
         end AST_Entry;
5462
 
5463
         ------------------
5464
         -- Asynchronous --
5465
         ------------------
5466
 
5467
         --  pragma Asynchronous (LOCAL_NAME);
5468
 
5469
         when Pragma_Asynchronous => Asynchronous : declare
5470
            Nm     : Entity_Id;
5471
            C_Ent  : Entity_Id;
5472
            L      : List_Id;
5473
            S      : Node_Id;
5474
            N      : Node_Id;
5475
            Formal : Entity_Id;
5476
 
5477
            procedure Process_Async_Pragma;
5478
            --  Common processing for procedure and access-to-procedure case
5479
 
5480
            --------------------------
5481
            -- Process_Async_Pragma --
5482
            --------------------------
5483
 
5484
            procedure Process_Async_Pragma is
5485
            begin
5486
               if No (L) then
5487
                  Set_Is_Asynchronous (Nm);
5488
                  return;
5489
               end if;
5490
 
5491
               --  The formals should be of mode IN (RM E.4.1(6))
5492
 
5493
               S := First (L);
5494
               while Present (S) loop
5495
                  Formal := Defining_Identifier (S);
5496
 
5497
                  if Nkind (Formal) = N_Defining_Identifier
5498
                    and then Ekind (Formal) /= E_In_Parameter
5499
                  then
5500
                     Error_Pragma_Arg
5501
                       ("pragma% procedure can only have IN parameter",
5502
                        Arg1);
5503
                  end if;
5504
 
5505
                  Next (S);
5506
               end loop;
5507
 
5508
               Set_Is_Asynchronous (Nm);
5509
            end Process_Async_Pragma;
5510
 
5511
         --  Start of processing for pragma Asynchronous
5512
 
5513
         begin
5514
            Check_Ada_83_Warning;
5515
            Check_No_Identifiers;
5516
            Check_Arg_Count (1);
5517
            Check_Arg_Is_Local_Name (Arg1);
5518
 
5519
            if Debug_Flag_U then
5520
               return;
5521
            end if;
5522
 
5523
            C_Ent := Cunit_Entity (Current_Sem_Unit);
5524
            Analyze (Expression (Arg1));
5525
            Nm := Entity (Expression (Arg1));
5526
 
5527
            if not Is_Remote_Call_Interface (C_Ent)
5528
              and then not Is_Remote_Types (C_Ent)
5529
            then
5530
               --  This pragma should only appear in an RCI or Remote Types
5531
               --  unit (RM E.4.1(4)).
5532
 
5533
               Error_Pragma
5534
                 ("pragma% not in Remote_Call_Interface or " &
5535
                  "Remote_Types unit");
5536
            end if;
5537
 
5538
            if Ekind (Nm) = E_Procedure
5539
              and then Nkind (Parent (Nm)) = N_Procedure_Specification
5540
            then
5541
               if not Is_Remote_Call_Interface (Nm) then
5542
                  Error_Pragma_Arg
5543
                    ("pragma% cannot be applied on non-remote procedure",
5544
                     Arg1);
5545
               end if;
5546
 
5547
               L := Parameter_Specifications (Parent (Nm));
5548
               Process_Async_Pragma;
5549
               return;
5550
 
5551
            elsif Ekind (Nm) = E_Function then
5552
               Error_Pragma_Arg
5553
                 ("pragma% cannot be applied to function", Arg1);
5554
 
5555
            elsif Is_Remote_Access_To_Subprogram_Type (Nm) then
5556
 
5557
                  if Is_Record_Type (Nm) then
5558
 
5559
                  --  A record type that is the Equivalent_Type for a remote
5560
                  --  access-to-subprogram type.
5561
 
5562
                     N := Declaration_Node (Corresponding_Remote_Type (Nm));
5563
 
5564
                  else
5565
                     --  A non-expanded RAS type (distribution is not enabled)
5566
 
5567
                     N := Declaration_Node (Nm);
5568
                  end if;
5569
 
5570
               if Nkind (N) = N_Full_Type_Declaration
5571
                 and then Nkind (Type_Definition (N)) =
5572
                                     N_Access_Procedure_Definition
5573
               then
5574
                  L := Parameter_Specifications (Type_Definition (N));
5575
                  Process_Async_Pragma;
5576
 
5577
                  if Is_Asynchronous (Nm)
5578
                    and then Expander_Active
5579
                    and then Get_PCS_Name /= Name_No_DSA
5580
                  then
5581
                     RACW_Type_Is_Asynchronous (Underlying_RACW_Type (Nm));
5582
                  end if;
5583
 
5584
               else
5585
                  Error_Pragma_Arg
5586
                    ("pragma% cannot reference access-to-function type",
5587
                    Arg1);
5588
               end if;
5589
 
5590
            --  Only other possibility is Access-to-class-wide type
5591
 
5592
            elsif Is_Access_Type (Nm)
5593
              and then Is_Class_Wide_Type (Designated_Type (Nm))
5594
            then
5595
               Check_First_Subtype (Arg1);
5596
               Set_Is_Asynchronous (Nm);
5597
               if Expander_Active then
5598
                  RACW_Type_Is_Asynchronous (Nm);
5599
               end if;
5600
 
5601
            else
5602
               Error_Pragma_Arg ("inappropriate argument for pragma%", Arg1);
5603
            end if;
5604
         end Asynchronous;
5605
 
5606
         ------------
5607
         -- Atomic --
5608
         ------------
5609
 
5610
         --  pragma Atomic (LOCAL_NAME);
5611
 
5612
         when Pragma_Atomic =>
5613
            Process_Atomic_Shared_Volatile;
5614
 
5615
         -----------------------
5616
         -- Atomic_Components --
5617
         -----------------------
5618
 
5619
         --  pragma Atomic_Components (array_LOCAL_NAME);
5620
 
5621
         --  This processing is shared by Volatile_Components
5622
 
5623
         when Pragma_Atomic_Components   |
5624
              Pragma_Volatile_Components =>
5625
 
5626
         Atomic_Components : declare
5627
            E_Id : Node_Id;
5628
            E    : Entity_Id;
5629
            D    : Node_Id;
5630
            K    : Node_Kind;
5631
 
5632
         begin
5633
            Check_Ada_83_Warning;
5634
            Check_No_Identifiers;
5635
            Check_Arg_Count (1);
5636
            Check_Arg_Is_Local_Name (Arg1);
5637
            E_Id := Expression (Arg1);
5638
 
5639
            if Etype (E_Id) = Any_Type then
5640
               return;
5641
            end if;
5642
 
5643
            E := Entity (E_Id);
5644
 
5645
            if Rep_Item_Too_Early (E, N)
5646
                 or else
5647
               Rep_Item_Too_Late (E, N)
5648
            then
5649
               return;
5650
            end if;
5651
 
5652
            D := Declaration_Node (E);
5653
            K := Nkind (D);
5654
 
5655
            if (K = N_Full_Type_Declaration and then Is_Array_Type (E))
5656
              or else
5657
                ((Ekind (E) = E_Constant or else Ekind (E) = E_Variable)
5658
                   and then Nkind (D) = N_Object_Declaration
5659
                   and then Nkind (Object_Definition (D)) =
5660
                                       N_Constrained_Array_Definition)
5661
            then
5662
               --  The flag is set on the object, or on the base type
5663
 
5664
               if Nkind (D) /= N_Object_Declaration then
5665
                  E := Base_Type (E);
5666
               end if;
5667
 
5668
               Set_Has_Volatile_Components (E);
5669
 
5670
               if Prag_Id = Pragma_Atomic_Components then
5671
                  Set_Has_Atomic_Components (E);
5672
 
5673
                  if Is_Packed (E) then
5674
                     Set_Is_Packed (E, False);
5675
 
5676
                     Error_Pragma_Arg
5677
                       ("?Pack canceled, cannot pack atomic components",
5678
                        Arg1);
5679
                  end if;
5680
               end if;
5681
 
5682
            else
5683
               Error_Pragma_Arg ("inappropriate entity for pragma%", Arg1);
5684
            end if;
5685
         end Atomic_Components;
5686
 
5687
         --------------------
5688
         -- Attach_Handler --
5689
         --------------------
5690
 
5691
         --  pragma Attach_Handler (handler_NAME, EXPRESSION);
5692
 
5693
         when Pragma_Attach_Handler =>
5694
            Check_Ada_83_Warning;
5695
            Check_No_Identifiers;
5696
            Check_Arg_Count (2);
5697
 
5698
            if No_Run_Time_Mode then
5699
               Error_Msg_CRT ("Attach_Handler pragma", N);
5700
            else
5701
               Check_Interrupt_Or_Attach_Handler;
5702
 
5703
               --  The expression that designates the attribute may
5704
               --  depend on a discriminant, and is therefore a per-
5705
               --  object expression, to be expanded in the init proc.
5706
               --  If expansion is enabled, perform semantic checks
5707
               --  on a copy only.
5708
 
5709
               if Expander_Active then
5710
                  declare
5711
                     Temp : constant Node_Id :=
5712
                              New_Copy_Tree (Expression (Arg2));
5713
                  begin
5714
                     Set_Parent (Temp, N);
5715
                     Preanalyze_And_Resolve (Temp, RTE (RE_Interrupt_ID));
5716
                  end;
5717
 
5718
               else
5719
                  Analyze (Expression (Arg2));
5720
                  Resolve (Expression (Arg2), RTE (RE_Interrupt_ID));
5721
               end if;
5722
 
5723
               Process_Interrupt_Or_Attach_Handler;
5724
            end if;
5725
 
5726
         --------------------
5727
         -- C_Pass_By_Copy --
5728
         --------------------
5729
 
5730
         --  pragma C_Pass_By_Copy ([Max_Size =>] static_integer_EXPRESSION);
5731
 
5732
         when Pragma_C_Pass_By_Copy => C_Pass_By_Copy : declare
5733
            Arg : Node_Id;
5734
            Val : Uint;
5735
 
5736
         begin
5737
            GNAT_Pragma;
5738
            Check_Valid_Configuration_Pragma;
5739
            Check_Arg_Count (1);
5740
            Check_Optional_Identifier (Arg1, "max_size");
5741
 
5742
            Arg := Expression (Arg1);
5743
            Check_Arg_Is_Static_Expression (Arg, Any_Integer);
5744
 
5745
            Val := Expr_Value (Arg);
5746
 
5747
            if Val <= 0 then
5748
               Error_Pragma_Arg
5749
                 ("maximum size for pragma% must be positive", Arg1);
5750
 
5751
            elsif UI_Is_In_Int_Range (Val) then
5752
               Default_C_Record_Mechanism := UI_To_Int (Val);
5753
 
5754
            --  If a giant value is given, Int'Last will do well enough.
5755
            --  If sometime someone complains that a record larger than
5756
            --  two gigabytes is not copied, we will worry about it then!
5757
 
5758
            else
5759
               Default_C_Record_Mechanism := Mechanism_Type'Last;
5760
            end if;
5761
         end C_Pass_By_Copy;
5762
 
5763
         -----------
5764
         -- Check --
5765
         -----------
5766
 
5767
         --  pragma Check ([Name    =>] Identifier,
5768
         --                [Check   =>] Boolean_Expression
5769
         --              [,[Message =>] String_Expression]);
5770
 
5771
         when Pragma_Check => Check : declare
5772
            Expr : Node_Id;
5773
            Eloc : Source_Ptr;
5774
 
5775
            Check_On : Boolean;
5776
            --  Set True if category of assertions referenced by Name enabled
5777
 
5778
         begin
5779
            GNAT_Pragma;
5780
            Check_At_Least_N_Arguments (2);
5781
            Check_At_Most_N_Arguments (3);
5782
            Check_Optional_Identifier (Arg1, Name_Name);
5783
            Check_Optional_Identifier (Arg2, Name_Check);
5784
 
5785
            if Arg_Count = 3 then
5786
               Check_Optional_Identifier (Arg3, Name_Message);
5787
               Analyze_And_Resolve (Get_Pragma_Arg (Arg3), Standard_String);
5788
            end if;
5789
 
5790
            Check_Arg_Is_Identifier (Arg1);
5791
            Check_On := Check_Enabled (Chars (Get_Pragma_Arg (Arg1)));
5792
            Set_Pragma_Enabled (N, Check_On);
5793
 
5794
            --  If expansion is active and the check is not enabled then we
5795
            --  rewrite the Check as:
5796
 
5797
            --    if False and then condition then
5798
            --       null;
5799
            --    end if;
5800
 
5801
            --  The reason we do this rewriting during semantic analysis rather
5802
            --  than as part of normal expansion is that we cannot analyze and
5803
            --  expand the code for the boolean expression directly, or it may
5804
            --  cause insertion of actions that would escape the attempt to
5805
            --  suppress the check code.
5806
 
5807
            --  Note that the Sloc for the if statement corresponds to the
5808
            --  argument condition, not the pragma itself. The reason for this
5809
            --  is that we may generate a warning if the condition is False at
5810
            --  compile time, and we do not want to delete this warning when we
5811
            --  delete the if statement.
5812
 
5813
            Expr := Expression (Arg2);
5814
 
5815
            if Expander_Active and then not Check_On then
5816
               Eloc := Sloc (Expr);
5817
 
5818
               Rewrite (N,
5819
                 Make_If_Statement (Eloc,
5820
                   Condition =>
5821
                     Make_And_Then (Eloc,
5822
                       Left_Opnd  => New_Occurrence_Of (Standard_False, Eloc),
5823
                       Right_Opnd => Expr),
5824
                   Then_Statements => New_List (
5825
                     Make_Null_Statement (Eloc))));
5826
 
5827
               Analyze (N);
5828
 
5829
            --  Check is active
5830
 
5831
            else
5832
               Analyze_And_Resolve (Expr, Any_Boolean);
5833
            end if;
5834
         end Check;
5835
 
5836
         ----------------
5837
         -- Check_Name --
5838
         ----------------
5839
 
5840
         --  pragma Check_Name (check_IDENTIFIER);
5841
 
5842
         when Pragma_Check_Name =>
5843
            Check_No_Identifiers;
5844
            GNAT_Pragma;
5845
            Check_Valid_Configuration_Pragma;
5846
            Check_Arg_Count (1);
5847
            Check_Arg_Is_Identifier (Arg1);
5848
 
5849
            declare
5850
               Nam : constant Name_Id := Chars (Expression (Arg1));
5851
 
5852
            begin
5853
               for J in Check_Names.First .. Check_Names.Last loop
5854
                  if Check_Names.Table (J) = Nam then
5855
                     return;
5856
                  end if;
5857
               end loop;
5858
 
5859
               Check_Names.Append (Nam);
5860
            end;
5861
 
5862
         ------------------
5863
         -- Check_Policy --
5864
         ------------------
5865
 
5866
         --  pragma Check_Policy (
5867
         --    [Name   =>] IDENTIFIER,
5868
         --    [Policy =>] POLICY_IDENTIFIER);
5869
 
5870
         --  POLICY_IDENTIFIER ::= ON | OFF | CHECK | IGNORE
5871
 
5872
         --  Note: this is a configuration pragma, but it is allowed to appear
5873
         --  anywhere else.
5874
 
5875
         when Pragma_Check_Policy =>
5876
            GNAT_Pragma;
5877
            Check_Arg_Count (2);
5878
            Check_Optional_Identifier (Arg1, Name_Name);
5879
            Check_Optional_Identifier (Arg2, Name_Policy);
5880
            Check_Arg_Is_One_Of
5881
              (Arg2, Name_On, Name_Off, Name_Check, Name_Ignore);
5882
 
5883
            --  A Check_Policy pragma can appear either as a configuration
5884
            --  pragma, or in a declarative part or a package spec (see RM
5885
            --  11.5(5) for rules for Suppress/Unsuppress which are also
5886
            --  followed for Check_Policy).
5887
 
5888
            if not Is_Configuration_Pragma then
5889
               Check_Is_In_Decl_Part_Or_Package_Spec;
5890
            end if;
5891
 
5892
            Set_Next_Pragma (N, Opt.Check_Policy_List);
5893
            Opt.Check_Policy_List := N;
5894
 
5895
         ---------------------
5896
         -- CIL_Constructor --
5897
         ---------------------
5898
 
5899
         --  pragma CIL_Constructor ([Entity =>] LOCAL_NAME);
5900
 
5901
         --  Processing for this pragma is shared with Java_Constructor
5902
 
5903
         -------------
5904
         -- Comment --
5905
         -------------
5906
 
5907
         --  pragma Comment (static_string_EXPRESSION)
5908
 
5909
         --  Processing for pragma Comment shares the circuitry for pragma
5910
         --  Ident. The only differences are that Ident enforces a limit of 31
5911
         --  characters on its argument, and also enforces limitations on
5912
         --  placement for DEC compatibility. Pragma Comment shares neither of
5913
         --  these restrictions.
5914
 
5915
         -------------------
5916
         -- Common_Object --
5917
         -------------------
5918
 
5919
         --  pragma Common_Object (
5920
         --        [Internal =>] LOCAL_NAME
5921
         --     [, [External =>] EXTERNAL_SYMBOL]
5922
         --     [, [Size     =>] EXTERNAL_SYMBOL]);
5923
 
5924
         --  Processing for this pragma is shared with Psect_Object
5925
 
5926
         ------------------------
5927
         -- Compile_Time_Error --
5928
         ------------------------
5929
 
5930
         --  pragma Compile_Time_Error
5931
         --    (boolean_EXPRESSION, static_string_EXPRESSION);
5932
 
5933
         when Pragma_Compile_Time_Error =>
5934
            GNAT_Pragma;
5935
            Process_Compile_Time_Warning_Or_Error;
5936
 
5937
         --------------------------
5938
         -- Compile_Time_Warning --
5939
         --------------------------
5940
 
5941
         --  pragma Compile_Time_Warning
5942
         --    (boolean_EXPRESSION, static_string_EXPRESSION);
5943
 
5944
         when Pragma_Compile_Time_Warning =>
5945
            GNAT_Pragma;
5946
            Process_Compile_Time_Warning_Or_Error;
5947
 
5948
         -------------------
5949
         -- Compiler_Unit --
5950
         -------------------
5951
 
5952
         when Pragma_Compiler_Unit =>
5953
            GNAT_Pragma;
5954
            Check_Arg_Count (0);
5955
            Set_Is_Compiler_Unit (Get_Source_Unit (N));
5956
 
5957
         -----------------------------
5958
         -- Complete_Representation --
5959
         -----------------------------
5960
 
5961
         --  pragma Complete_Representation;
5962
 
5963
         when Pragma_Complete_Representation =>
5964
            GNAT_Pragma;
5965
            Check_Arg_Count (0);
5966
 
5967
            if Nkind (Parent (N)) /= N_Record_Representation_Clause then
5968
               Error_Pragma
5969
                 ("pragma & must appear within record representation clause");
5970
            end if;
5971
 
5972
         ----------------------------
5973
         -- Complex_Representation --
5974
         ----------------------------
5975
 
5976
         --  pragma Complex_Representation ([Entity =>] LOCAL_NAME);
5977
 
5978
         when Pragma_Complex_Representation => Complex_Representation : declare
5979
            E_Id : Entity_Id;
5980
            E    : Entity_Id;
5981
            Ent  : Entity_Id;
5982
 
5983
         begin
5984
            GNAT_Pragma;
5985
            Check_Arg_Count (1);
5986
            Check_Optional_Identifier (Arg1, Name_Entity);
5987
            Check_Arg_Is_Local_Name (Arg1);
5988
            E_Id := Expression (Arg1);
5989
 
5990
            if Etype (E_Id) = Any_Type then
5991
               return;
5992
            end if;
5993
 
5994
            E := Entity (E_Id);
5995
 
5996
            if not Is_Record_Type (E) then
5997
               Error_Pragma_Arg
5998
                 ("argument for pragma% must be record type", Arg1);
5999
            end if;
6000
 
6001
            Ent := First_Entity (E);
6002
 
6003
            if No (Ent)
6004
              or else No (Next_Entity (Ent))
6005
              or else Present (Next_Entity (Next_Entity (Ent)))
6006
              or else not Is_Floating_Point_Type (Etype (Ent))
6007
              or else Etype (Ent) /= Etype (Next_Entity (Ent))
6008
            then
6009
               Error_Pragma_Arg
6010
                 ("record for pragma% must have two fields of the same "
6011
                  & "floating-point type", Arg1);
6012
 
6013
            else
6014
               Set_Has_Complex_Representation (Base_Type (E));
6015
 
6016
               --  We need to treat the type has having a non-standard
6017
               --  representation, for back-end purposes, even though in
6018
               --  general a complex will have the default representation
6019
               --  of a record with two real components.
6020
 
6021
               Set_Has_Non_Standard_Rep (Base_Type (E));
6022
            end if;
6023
         end Complex_Representation;
6024
 
6025
         -------------------------
6026
         -- Component_Alignment --
6027
         -------------------------
6028
 
6029
         --  pragma Component_Alignment (
6030
         --        [Form =>] ALIGNMENT_CHOICE
6031
         --     [, [Name =>] type_LOCAL_NAME]);
6032
         --
6033
         --   ALIGNMENT_CHOICE ::=
6034
         --     Component_Size
6035
         --   | Component_Size_4
6036
         --   | Storage_Unit
6037
         --   | Default
6038
 
6039
         when Pragma_Component_Alignment => Component_AlignmentP : declare
6040
            Args  : Args_List (1 .. 2);
6041
            Names : constant Name_List (1 .. 2) := (
6042
                      Name_Form,
6043
                      Name_Name);
6044
 
6045
            Form  : Node_Id renames Args (1);
6046
            Name  : Node_Id renames Args (2);
6047
 
6048
            Atype : Component_Alignment_Kind;
6049
            Typ   : Entity_Id;
6050
 
6051
         begin
6052
            GNAT_Pragma;
6053
            Gather_Associations (Names, Args);
6054
 
6055
            if No (Form) then
6056
               Error_Pragma ("missing Form argument for pragma%");
6057
            end if;
6058
 
6059
            Check_Arg_Is_Identifier (Form);
6060
 
6061
            --  Get proper alignment, note that Default = Component_Size on all
6062
            --  machines we have so far, and we want to set this value rather
6063
            --  than the default value to indicate that it has been explicitly
6064
            --  set (and thus will not get overridden by the default component
6065
            --  alignment for the current scope)
6066
 
6067
            if Chars (Form) = Name_Component_Size then
6068
               Atype := Calign_Component_Size;
6069
 
6070
            elsif Chars (Form) = Name_Component_Size_4 then
6071
               Atype := Calign_Component_Size_4;
6072
 
6073
            elsif Chars (Form) = Name_Default then
6074
               Atype := Calign_Component_Size;
6075
 
6076
            elsif Chars (Form) = Name_Storage_Unit then
6077
               Atype := Calign_Storage_Unit;
6078
 
6079
            else
6080
               Error_Pragma_Arg
6081
                 ("invalid Form parameter for pragma%", Form);
6082
            end if;
6083
 
6084
            --  Case with no name, supplied, affects scope table entry
6085
 
6086
            if No (Name) then
6087
               Scope_Stack.Table
6088
                 (Scope_Stack.Last).Component_Alignment_Default := Atype;
6089
 
6090
            --  Case of name supplied
6091
 
6092
            else
6093
               Check_Arg_Is_Local_Name (Name);
6094
               Find_Type (Name);
6095
               Typ := Entity (Name);
6096
 
6097
               if Typ = Any_Type
6098
                 or else Rep_Item_Too_Early (Typ, N)
6099
               then
6100
                  return;
6101
               else
6102
                  Typ := Underlying_Type (Typ);
6103
               end if;
6104
 
6105
               if not Is_Record_Type (Typ)
6106
                 and then not Is_Array_Type (Typ)
6107
               then
6108
                  Error_Pragma_Arg
6109
                    ("Name parameter of pragma% must identify record or " &
6110
                     "array type", Name);
6111
               end if;
6112
 
6113
               --  An explicit Component_Alignment pragma overrides an
6114
               --  implicit pragma Pack, but not an explicit one.
6115
 
6116
               if not Has_Pragma_Pack (Base_Type (Typ)) then
6117
                  Set_Is_Packed (Base_Type (Typ), False);
6118
                  Set_Component_Alignment (Base_Type (Typ), Atype);
6119
               end if;
6120
            end if;
6121
         end Component_AlignmentP;
6122
 
6123
         ----------------
6124
         -- Controlled --
6125
         ----------------
6126
 
6127
         --  pragma Controlled (first_subtype_LOCAL_NAME);
6128
 
6129
         when Pragma_Controlled => Controlled : declare
6130
            Arg : Node_Id;
6131
 
6132
         begin
6133
            Check_No_Identifiers;
6134
            Check_Arg_Count (1);
6135
            Check_Arg_Is_Local_Name (Arg1);
6136
            Arg := Expression (Arg1);
6137
 
6138
            if not Is_Entity_Name (Arg)
6139
              or else not Is_Access_Type (Entity (Arg))
6140
            then
6141
               Error_Pragma_Arg ("pragma% requires access type", Arg1);
6142
            else
6143
               Set_Has_Pragma_Controlled (Base_Type (Entity (Arg)));
6144
            end if;
6145
         end Controlled;
6146
 
6147
         ----------------
6148
         -- Convention --
6149
         ----------------
6150
 
6151
         --  pragma Convention ([Convention =>] convention_IDENTIFIER,
6152
         --    [Entity =>] LOCAL_NAME);
6153
 
6154
         when Pragma_Convention => Convention : declare
6155
            C : Convention_Id;
6156
            E : Entity_Id;
6157
            pragma Warnings (Off, C);
6158
            pragma Warnings (Off, E);
6159
         begin
6160
            Check_Arg_Order ((Name_Convention, Name_Entity));
6161
            Check_Ada_83_Warning;
6162
            Check_Arg_Count (2);
6163
            Process_Convention (C, E);
6164
         end Convention;
6165
 
6166
         ---------------------------
6167
         -- Convention_Identifier --
6168
         ---------------------------
6169
 
6170
         --  pragma Convention_Identifier ([Name =>] IDENTIFIER,
6171
         --    [Convention =>] convention_IDENTIFIER);
6172
 
6173
         when Pragma_Convention_Identifier => Convention_Identifier : declare
6174
            Idnam : Name_Id;
6175
            Cname : Name_Id;
6176
 
6177
         begin
6178
            GNAT_Pragma;
6179
            Check_Arg_Order ((Name_Name, Name_Convention));
6180
            Check_Arg_Count (2);
6181
            Check_Optional_Identifier (Arg1, Name_Name);
6182
            Check_Optional_Identifier (Arg2, Name_Convention);
6183
            Check_Arg_Is_Identifier (Arg1);
6184
            Check_Arg_Is_Identifier (Arg2);
6185
            Idnam := Chars (Expression (Arg1));
6186
            Cname := Chars (Expression (Arg2));
6187
 
6188
            if Is_Convention_Name (Cname) then
6189
               Record_Convention_Identifier
6190
                 (Idnam, Get_Convention_Id (Cname));
6191
            else
6192
               Error_Pragma_Arg
6193
                 ("second arg for % pragma must be convention", Arg2);
6194
            end if;
6195
         end Convention_Identifier;
6196
 
6197
         ---------------
6198
         -- CPP_Class --
6199
         ---------------
6200
 
6201
         --  pragma CPP_Class ([Entity =>] local_NAME)
6202
 
6203
         when Pragma_CPP_Class => CPP_Class : declare
6204
            Arg : Node_Id;
6205
            Typ : Entity_Id;
6206
 
6207
         begin
6208
            if Warn_On_Obsolescent_Feature then
6209
               Error_Msg_N
6210
                 ("'G'N'A'T pragma cpp'_class is now obsolete; replace it" &
6211
                  " by pragma import?", N);
6212
            end if;
6213
 
6214
            GNAT_Pragma;
6215
            Check_Arg_Count (1);
6216
            Check_Optional_Identifier (Arg1, Name_Entity);
6217
            Check_Arg_Is_Local_Name (Arg1);
6218
 
6219
            Arg := Expression (Arg1);
6220
            Analyze (Arg);
6221
 
6222
            if Etype (Arg) = Any_Type then
6223
               return;
6224
            end if;
6225
 
6226
            if not Is_Entity_Name (Arg)
6227
              or else not Is_Type (Entity (Arg))
6228
            then
6229
               Error_Pragma_Arg ("pragma% requires a type mark", Arg1);
6230
            end if;
6231
 
6232
            Typ := Entity (Arg);
6233
 
6234
            if not Is_Tagged_Type (Typ) then
6235
               Error_Pragma_Arg ("pragma% applicable to tagged types ", Arg1);
6236
            end if;
6237
 
6238
            --  Types treated as CPP classes are treated as limited, but we
6239
            --  don't require them to be declared this way. A warning is issued
6240
            --  to encourage the user to declare them as limited. This is not
6241
            --  an error, for compatibility reasons, because these types have
6242
            --  been supported this way for some time.
6243
 
6244
            if not Is_Limited_Type (Typ) then
6245
               Error_Msg_N
6246
                 ("imported 'C'P'P type should be " &
6247
                    "explicitly declared limited?",
6248
                  Get_Pragma_Arg (Arg1));
6249
               Error_Msg_N
6250
                 ("\type will be considered limited",
6251
                  Get_Pragma_Arg (Arg1));
6252
            end if;
6253
 
6254
            Set_Is_CPP_Class      (Typ);
6255
            Set_Is_Limited_Record (Typ);
6256
            Set_Convention        (Typ, Convention_CPP);
6257
 
6258
            --  Imported CPP types must not have discriminants (because C++
6259
            --  classes do not have discriminants).
6260
 
6261
            if Has_Discriminants (Typ) then
6262
               Error_Msg_N
6263
                 ("imported 'C'P'P type cannot have discriminants",
6264
                  First (Discriminant_Specifications
6265
                          (Declaration_Node (Typ))));
6266
            end if;
6267
 
6268
            --  Components of imported CPP types must not have default
6269
            --  expressions because the constructor (if any) is in the
6270
            --  C++ side.
6271
 
6272
            if Is_Incomplete_Or_Private_Type (Typ)
6273
              and then No (Underlying_Type (Typ))
6274
            then
6275
               --  It should be an error to apply pragma CPP to a private
6276
               --  type if the underlying type is not visible (as it is
6277
               --  for any representation item). For now, for backward
6278
               --  compatibility we do nothing but we cannot check components
6279
               --  because they are not available at this stage. All this code
6280
               --  will be removed when we cleanup this obsolete GNAT pragma???
6281
 
6282
               null;
6283
 
6284
            else
6285
               declare
6286
                  Tdef  : constant Node_Id :=
6287
                            Type_Definition (Declaration_Node (Typ));
6288
                  Clist : Node_Id;
6289
                  Comp  : Node_Id;
6290
 
6291
               begin
6292
                  if Nkind (Tdef) = N_Record_Definition then
6293
                     Clist := Component_List (Tdef);
6294
                  else
6295
                     pragma Assert (Nkind (Tdef) = N_Derived_Type_Definition);
6296
                     Clist := Component_List (Record_Extension_Part (Tdef));
6297
                  end if;
6298
 
6299
                  if Present (Clist) then
6300
                     Comp := First (Component_Items (Clist));
6301
                     while Present (Comp) loop
6302
                        if Present (Expression (Comp)) then
6303
                           Error_Msg_N
6304
                             ("component of imported 'C'P'P type cannot have" &
6305
                              " default expression", Expression (Comp));
6306
                        end if;
6307
 
6308
                        Next (Comp);
6309
                     end loop;
6310
                  end if;
6311
               end;
6312
            end if;
6313
         end CPP_Class;
6314
 
6315
         ---------------------
6316
         -- CPP_Constructor --
6317
         ---------------------
6318
 
6319
         --  pragma CPP_Constructor ([Entity =>] LOCAL_NAME
6320
         --    [, [External_Name =>] static_string_EXPRESSION ]
6321
         --    [, [Link_Name     =>] static_string_EXPRESSION ]);
6322
 
6323
         when Pragma_CPP_Constructor => CPP_Constructor : declare
6324
            Elmt    : Elmt_Id;
6325
            Id      : Entity_Id;
6326
            Def_Id  : Entity_Id;
6327
            Tag_Typ : Entity_Id;
6328
 
6329
         begin
6330
            GNAT_Pragma;
6331
            Check_At_Least_N_Arguments (1);
6332
            Check_At_Most_N_Arguments (3);
6333
            Check_Optional_Identifier (Arg1, Name_Entity);
6334
            Check_Arg_Is_Local_Name (Arg1);
6335
 
6336
            Id := Expression (Arg1);
6337
            Find_Program_Unit_Name (Id);
6338
 
6339
            --  If we did not find the name, we are done
6340
 
6341
            if Etype (Id) = Any_Type then
6342
               return;
6343
            end if;
6344
 
6345
            Def_Id := Entity (Id);
6346
 
6347
            if Ekind (Def_Id) = E_Function
6348
              and then (Is_CPP_Class (Etype (Def_Id))
6349
                         or else (Is_Class_Wide_Type (Etype (Def_Id))
6350
                                   and then
6351
                                  Is_CPP_Class (Root_Type (Etype (Def_Id)))))
6352
            then
6353
               if Arg_Count >= 2 then
6354
                  Set_Imported (Def_Id);
6355
                  Set_Is_Public (Def_Id);
6356
                  Process_Interface_Name (Def_Id, Arg2, Arg3);
6357
               end if;
6358
 
6359
               Set_Has_Completion (Def_Id);
6360
               Set_Is_Constructor (Def_Id);
6361
 
6362
               --  Imported C++ constructors are not dispatching primitives
6363
               --  because in C++ they don't have a dispatch table slot.
6364
               --  However, in Ada the constructor has the profile of a
6365
               --  function that returns a tagged type and therefore it has
6366
               --  been treated as a primitive operation during semantic
6367
               --  analysis. We now remove it from the list of primitive
6368
               --  operations of the type.
6369
 
6370
               if Is_Tagged_Type (Etype (Def_Id))
6371
                 and then not Is_Class_Wide_Type (Etype (Def_Id))
6372
               then
6373
                  pragma Assert (Is_Dispatching_Operation (Def_Id));
6374
                  Tag_Typ := Etype (Def_Id);
6375
 
6376
                  Elmt := First_Elmt (Primitive_Operations (Tag_Typ));
6377
                  while Present (Elmt) and then Node (Elmt) /= Def_Id loop
6378
                     Next_Elmt (Elmt);
6379
                  end loop;
6380
 
6381
                  Remove_Elmt (Primitive_Operations (Tag_Typ), Elmt);
6382
                  Set_Is_Dispatching_Operation (Def_Id, False);
6383
               end if;
6384
 
6385
               --  For backward compatibility, if the constructor returns a
6386
               --  class wide type, and we internally change the return type to
6387
               --  the corresponding root type.
6388
 
6389
               if Is_Class_Wide_Type (Etype (Def_Id)) then
6390
                  Set_Etype (Def_Id, Root_Type (Etype (Def_Id)));
6391
               end if;
6392
            else
6393
               Error_Pragma_Arg
6394
                 ("pragma% requires function returning a 'C'P'P_Class type",
6395
                   Arg1);
6396
            end if;
6397
         end CPP_Constructor;
6398
 
6399
         -----------------
6400
         -- CPP_Virtual --
6401
         -----------------
6402
 
6403
         when Pragma_CPP_Virtual => CPP_Virtual : declare
6404
         begin
6405
            GNAT_Pragma;
6406
 
6407
            if Warn_On_Obsolescent_Feature then
6408
               Error_Msg_N
6409
                 ("'G'N'A'T pragma cpp'_virtual is now obsolete and has " &
6410
                  "no effect?", N);
6411
            end if;
6412
         end CPP_Virtual;
6413
 
6414
         ----------------
6415
         -- CPP_Vtable --
6416
         ----------------
6417
 
6418
         when Pragma_CPP_Vtable => CPP_Vtable : declare
6419
         begin
6420
            GNAT_Pragma;
6421
 
6422
            if Warn_On_Obsolescent_Feature then
6423
               Error_Msg_N
6424
                 ("'G'N'A'T pragma cpp'_vtable is now obsolete and has " &
6425
                  "no effect?", N);
6426
            end if;
6427
         end CPP_Vtable;
6428
 
6429
         -----------
6430
         -- Debug --
6431
         -----------
6432
 
6433
         --  pragma Debug ([boolean_EXPRESSION,] PROCEDURE_CALL_STATEMENT);
6434
 
6435
         when Pragma_Debug => Debug : declare
6436
               Cond : Node_Id;
6437
 
6438
         begin
6439
            GNAT_Pragma;
6440
 
6441
            Cond :=
6442
              New_Occurrence_Of
6443
                (Boolean_Literals (Debug_Pragmas_Enabled and Expander_Active),
6444
                 Loc);
6445
 
6446
            if Arg_Count = 2 then
6447
               Cond :=
6448
                 Make_And_Then (Loc,
6449
                   Left_Opnd   => Relocate_Node (Cond),
6450
                   Right_Opnd  => Expression (Arg1));
6451
            end if;
6452
 
6453
            --  Rewrite into a conditional with an appropriate condition. We
6454
            --  wrap the procedure call in a block so that overhead from e.g.
6455
            --  use of the secondary stack does not generate execution overhead
6456
            --  for suppressed conditions.
6457
 
6458
            Rewrite (N, Make_Implicit_If_Statement (N,
6459
              Condition => Cond,
6460
                 Then_Statements => New_List (
6461
                   Make_Block_Statement (Loc,
6462
                     Handled_Statement_Sequence =>
6463
                       Make_Handled_Sequence_Of_Statements (Loc,
6464
                         Statements => New_List (
6465
                           Relocate_Node (Debug_Statement (N))))))));
6466
            Analyze (N);
6467
         end Debug;
6468
 
6469
         ------------------
6470
         -- Debug_Policy --
6471
         ------------------
6472
 
6473
         --  pragma Debug_Policy (Check | Ignore)
6474
 
6475
         when Pragma_Debug_Policy =>
6476
            GNAT_Pragma;
6477
            Check_Arg_Count (1);
6478
            Check_Arg_Is_One_Of (Arg1, Name_Check, Name_Ignore);
6479
            Debug_Pragmas_Enabled := Chars (Expression (Arg1)) = Name_Check;
6480
 
6481
         ---------------------
6482
         -- Detect_Blocking --
6483
         ---------------------
6484
 
6485
         --  pragma Detect_Blocking;
6486
 
6487
         when Pragma_Detect_Blocking =>
6488
            Ada_2005_Pragma;
6489
            Check_Arg_Count (0);
6490
            Check_Valid_Configuration_Pragma;
6491
            Detect_Blocking := True;
6492
 
6493
         ---------------
6494
         -- Dimension --
6495
         ---------------
6496
 
6497
         when Pragma_Dimension =>
6498
            GNAT_Pragma;
6499
            Check_Arg_Count (4);
6500
            Check_No_Identifiers;
6501
            Check_Arg_Is_Local_Name (Arg1);
6502
 
6503
            if not Is_Type (Arg1) then
6504
               Error_Pragma ("first argument for pragma% must be subtype");
6505
            end if;
6506
 
6507
            Check_Arg_Is_Static_Expression (Arg2, Standard_Integer);
6508
            Check_Arg_Is_Static_Expression (Arg3, Standard_Integer);
6509
            Check_Arg_Is_Static_Expression (Arg4, Standard_Integer);
6510
 
6511
         -------------------
6512
         -- Discard_Names --
6513
         -------------------
6514
 
6515
         --  pragma Discard_Names [([On =>] LOCAL_NAME)];
6516
 
6517
         when Pragma_Discard_Names => Discard_Names : declare
6518
            E    : Entity_Id;
6519
            E_Id : Entity_Id;
6520
 
6521
         begin
6522
            Check_Ada_83_Warning;
6523
 
6524
            --  Deal with configuration pragma case
6525
 
6526
            if Arg_Count = 0 and then Is_Configuration_Pragma then
6527
               Global_Discard_Names := True;
6528
               return;
6529
 
6530
            --  Otherwise, check correct appropriate context
6531
 
6532
            else
6533
               Check_Is_In_Decl_Part_Or_Package_Spec;
6534
 
6535
               if Arg_Count = 0 then
6536
 
6537
                  --  If there is no parameter, then from now on this pragma
6538
                  --  applies to any enumeration, exception or tagged type
6539
                  --  defined in the current declarative part, and recursively
6540
                  --  to any nested scope.
6541
 
6542
                  Set_Discard_Names (Current_Scope);
6543
                  return;
6544
 
6545
               else
6546
                  Check_Arg_Count (1);
6547
                  Check_Optional_Identifier (Arg1, Name_On);
6548
                  Check_Arg_Is_Local_Name (Arg1);
6549
 
6550
                  E_Id := Expression (Arg1);
6551
 
6552
                  if Etype (E_Id) = Any_Type then
6553
                     return;
6554
                  else
6555
                     E := Entity (E_Id);
6556
                  end if;
6557
 
6558
                  if (Is_First_Subtype (E)
6559
                      and then
6560
                        (Is_Enumeration_Type (E) or else Is_Tagged_Type (E)))
6561
                    or else Ekind (E) = E_Exception
6562
                  then
6563
                     Set_Discard_Names (E);
6564
                  else
6565
                     Error_Pragma_Arg
6566
                       ("inappropriate entity for pragma%", Arg1);
6567
                  end if;
6568
 
6569
               end if;
6570
            end if;
6571
         end Discard_Names;
6572
 
6573
         ---------------
6574
         -- Elaborate --
6575
         ---------------
6576
 
6577
         --  pragma Elaborate (library_unit_NAME {, library_unit_NAME});
6578
 
6579
         when Pragma_Elaborate => Elaborate : declare
6580
            Arg   : Node_Id;
6581
            Citem : Node_Id;
6582
 
6583
         begin
6584
            --  Pragma must be in context items list of a compilation unit
6585
 
6586
            if not Is_In_Context_Clause then
6587
               Pragma_Misplaced;
6588
            end if;
6589
 
6590
            --  Must be at least one argument
6591
 
6592
            if Arg_Count = 0 then
6593
               Error_Pragma ("pragma% requires at least one argument");
6594
            end if;
6595
 
6596
            --  In Ada 83 mode, there can be no items following it in the
6597
            --  context list except other pragmas and implicit with clauses
6598
            --  (e.g. those added by use of Rtsfind). In Ada 95 mode, this
6599
            --  placement rule does not apply.
6600
 
6601
            if Ada_Version = Ada_83 and then Comes_From_Source (N) then
6602
               Citem := Next (N);
6603
               while Present (Citem) loop
6604
                  if Nkind (Citem) = N_Pragma
6605
                    or else (Nkind (Citem) = N_With_Clause
6606
                              and then Implicit_With (Citem))
6607
                  then
6608
                     null;
6609
                  else
6610
                     Error_Pragma
6611
                       ("(Ada 83) pragma% must be at end of context clause");
6612
                  end if;
6613
 
6614
                  Next (Citem);
6615
               end loop;
6616
            end if;
6617
 
6618
            --  Finally, the arguments must all be units mentioned in a with
6619
            --  clause in the same context clause. Note we already checked (in
6620
            --  Par.Prag) that the arguments are all identifiers or selected
6621
            --  components.
6622
 
6623
            Arg := Arg1;
6624
            Outer : while Present (Arg) loop
6625
               Citem := First (List_Containing (N));
6626
               Inner : while Citem /= N loop
6627
                  if Nkind (Citem) = N_With_Clause
6628
                    and then Same_Name (Name (Citem), Expression (Arg))
6629
                  then
6630
                     Set_Elaborate_Present (Citem, True);
6631
                     Set_Unit_Name (Expression (Arg), Name (Citem));
6632
 
6633
                     --  With the pragma present, elaboration calls on
6634
                     --  subprograms from the named unit need no further
6635
                     --  checks, as long as the pragma appears in the current
6636
                     --  compilation unit. If the pragma appears in some unit
6637
                     --  in the context, there might still be a need for an
6638
                     --  Elaborate_All_Desirable from the current compilation
6639
                     --  to the named unit, so we keep the check enabled.
6640
 
6641
                     if In_Extended_Main_Source_Unit (N) then
6642
                        Set_Suppress_Elaboration_Warnings
6643
                          (Entity (Name (Citem)));
6644
                     end if;
6645
 
6646
                     exit Inner;
6647
                  end if;
6648
 
6649
                  Next (Citem);
6650
               end loop Inner;
6651
 
6652
               if Citem = N then
6653
                  Error_Pragma_Arg
6654
                    ("argument of pragma% is not with'ed unit", Arg);
6655
               end if;
6656
 
6657
               Next (Arg);
6658
            end loop Outer;
6659
 
6660
            --  Give a warning if operating in static mode with -gnatwl
6661
            --  (elaboration warnings enabled) switch set.
6662
 
6663
            if Elab_Warnings and not Dynamic_Elaboration_Checks then
6664
               Error_Msg_N
6665
                 ("?use of pragma Elaborate may not be safe", N);
6666
               Error_Msg_N
6667
                 ("?use pragma Elaborate_All instead if possible", N);
6668
            end if;
6669
         end Elaborate;
6670
 
6671
         -------------------
6672
         -- Elaborate_All --
6673
         -------------------
6674
 
6675
         --  pragma Elaborate_All (library_unit_NAME {, library_unit_NAME});
6676
 
6677
         when Pragma_Elaborate_All => Elaborate_All : declare
6678
            Arg   : Node_Id;
6679
            Citem : Node_Id;
6680
 
6681
         begin
6682
            Check_Ada_83_Warning;
6683
 
6684
            --  Pragma must be in context items list of a compilation unit
6685
 
6686
            if not Is_In_Context_Clause then
6687
               Pragma_Misplaced;
6688
            end if;
6689
 
6690
            --  Must be at least one argument
6691
 
6692
            if Arg_Count = 0 then
6693
               Error_Pragma ("pragma% requires at least one argument");
6694
            end if;
6695
 
6696
            --  Note: unlike pragma Elaborate, pragma Elaborate_All does not
6697
            --  have to appear at the end of the context clause, but may
6698
            --  appear mixed in with other items, even in Ada 83 mode.
6699
 
6700
            --  Final check: the arguments must all be units mentioned in
6701
            --  a with clause in the same context clause. Note that we
6702
            --  already checked (in Par.Prag) that all the arguments are
6703
            --  either identifiers or selected components.
6704
 
6705
            Arg := Arg1;
6706
            Outr : while Present (Arg) loop
6707
               Citem := First (List_Containing (N));
6708
               Innr : while Citem /= N loop
6709
                  if Nkind (Citem) = N_With_Clause
6710
                    and then Same_Name (Name (Citem), Expression (Arg))
6711
                  then
6712
                     Set_Elaborate_All_Present (Citem, True);
6713
                     Set_Unit_Name (Expression (Arg), Name (Citem));
6714
 
6715
                     --  Suppress warnings and elaboration checks on the named
6716
                     --  unit if the pragma is in the current compilation, as
6717
                     --  for pragma Elaborate.
6718
 
6719
                     if In_Extended_Main_Source_Unit (N) then
6720
                        Set_Suppress_Elaboration_Warnings
6721
                          (Entity (Name (Citem)));
6722
                     end if;
6723
                     exit Innr;
6724
                  end if;
6725
 
6726
                  Next (Citem);
6727
               end loop Innr;
6728
 
6729
               if Citem = N then
6730
                  Set_Error_Posted (N);
6731
                  Error_Pragma_Arg
6732
                    ("argument of pragma% is not with'ed unit", Arg);
6733
               end if;
6734
 
6735
               Next (Arg);
6736
            end loop Outr;
6737
         end Elaborate_All;
6738
 
6739
         --------------------
6740
         -- Elaborate_Body --
6741
         --------------------
6742
 
6743
         --  pragma Elaborate_Body [( library_unit_NAME )];
6744
 
6745
         when Pragma_Elaborate_Body => Elaborate_Body : declare
6746
            Cunit_Node : Node_Id;
6747
            Cunit_Ent  : Entity_Id;
6748
 
6749
         begin
6750
            Check_Ada_83_Warning;
6751
            Check_Valid_Library_Unit_Pragma;
6752
 
6753
            if Nkind (N) = N_Null_Statement then
6754
               return;
6755
            end if;
6756
 
6757
            Cunit_Node := Cunit (Current_Sem_Unit);
6758
            Cunit_Ent  := Cunit_Entity (Current_Sem_Unit);
6759
 
6760
            if Nkind_In (Unit (Cunit_Node), N_Package_Body,
6761
                                            N_Subprogram_Body)
6762
            then
6763
               Error_Pragma ("pragma% must refer to a spec, not a body");
6764
            else
6765
               Set_Body_Required (Cunit_Node, True);
6766
               Set_Has_Pragma_Elaborate_Body (Cunit_Ent);
6767
 
6768
               --  If we are in dynamic elaboration mode, then we suppress
6769
               --  elaboration warnings for the unit, since it is definitely
6770
               --  fine NOT to do dynamic checks at the first level (and such
6771
               --  checks will be suppressed because no elaboration boolean
6772
               --  is created for Elaborate_Body packages).
6773
 
6774
               --  But in the static model of elaboration, Elaborate_Body is
6775
               --  definitely NOT good enough to ensure elaboration safety on
6776
               --  its own, since the body may WITH other units that are not
6777
               --  safe from an elaboration point of view, so a client must
6778
               --  still do an Elaborate_All on such units.
6779
 
6780
               --  Debug flag -gnatdD restores the old behavior of 3.13, where
6781
               --  Elaborate_Body always suppressed elab warnings.
6782
 
6783
               if Dynamic_Elaboration_Checks or Debug_Flag_DD then
6784
                  Set_Suppress_Elaboration_Warnings (Cunit_Ent);
6785
               end if;
6786
            end if;
6787
         end Elaborate_Body;
6788
 
6789
         ------------------------
6790
         -- Elaboration_Checks --
6791
         ------------------------
6792
 
6793
         --  pragma Elaboration_Checks (Static | Dynamic);
6794
 
6795
         when Pragma_Elaboration_Checks =>
6796
            GNAT_Pragma;
6797
            Check_Arg_Count (1);
6798
            Check_Arg_Is_One_Of (Arg1, Name_Static, Name_Dynamic);
6799
            Dynamic_Elaboration_Checks :=
6800
              (Chars (Get_Pragma_Arg (Arg1)) = Name_Dynamic);
6801
 
6802
         ---------------
6803
         -- Eliminate --
6804
         ---------------
6805
 
6806
         --  pragma Eliminate (
6807
         --      [Unit_Name  =>] IDENTIFIER | SELECTED_COMPONENT,
6808
         --    [,[Entity     =>] IDENTIFIER |
6809
         --                      SELECTED_COMPONENT |
6810
         --                      STRING_LITERAL]
6811
         --    [,                OVERLOADING_RESOLUTION]);
6812
 
6813
         --  OVERLOADING_RESOLUTION ::= PARAMETER_AND_RESULT_TYPE_PROFILE |
6814
         --                             SOURCE_LOCATION
6815
 
6816
         --  PARAMETER_AND_RESULT_TYPE_PROFILE ::= PROCEDURE_PROFILE |
6817
         --                                        FUNCTION_PROFILE
6818
 
6819
         --  PROCEDURE_PROFILE ::= Parameter_Types => PARAMETER_TYPES
6820
 
6821
         --  FUNCTION_PROFILE ::= [Parameter_Types => PARAMETER_TYPES,]
6822
         --                       Result_Type => result_SUBTYPE_NAME]
6823
 
6824
         --  PARAMETER_TYPES ::= (SUBTYPE_NAME {, SUBTYPE_NAME})
6825
         --  SUBTYPE_NAME    ::= STRING_LITERAL
6826
 
6827
         --  SOURCE_LOCATION ::= Source_Location => SOURCE_TRACE
6828
         --  SOURCE_TRACE    ::= STRING_LITERAL
6829
 
6830
         when Pragma_Eliminate => Eliminate : declare
6831
            Args  : Args_List (1 .. 5);
6832
            Names : constant Name_List (1 .. 5) := (
6833
                      Name_Unit_Name,
6834
                      Name_Entity,
6835
                      Name_Parameter_Types,
6836
                      Name_Result_Type,
6837
                      Name_Source_Location);
6838
 
6839
            Unit_Name       : Node_Id renames Args (1);
6840
            Entity          : Node_Id renames Args (2);
6841
            Parameter_Types : Node_Id renames Args (3);
6842
            Result_Type     : Node_Id renames Args (4);
6843
            Source_Location : Node_Id renames Args (5);
6844
 
6845
         begin
6846
            GNAT_Pragma;
6847
            Check_Valid_Configuration_Pragma;
6848
            Gather_Associations (Names, Args);
6849
 
6850
            if No (Unit_Name) then
6851
               Error_Pragma ("missing Unit_Name argument for pragma%");
6852
            end if;
6853
 
6854
            if No (Entity)
6855
              and then (Present (Parameter_Types)
6856
                          or else
6857
                        Present (Result_Type)
6858
                          or else
6859
                        Present (Source_Location))
6860
            then
6861
               Error_Pragma ("missing Entity argument for pragma%");
6862
            end if;
6863
 
6864
            if (Present (Parameter_Types)
6865
                       or else
6866
                Present (Result_Type))
6867
              and then
6868
                Present (Source_Location)
6869
            then
6870
               Error_Pragma
6871
                 ("parameter profile and source location cannot " &
6872
                  "be used together in pragma%");
6873
            end if;
6874
 
6875
            Process_Eliminate_Pragma
6876
              (N,
6877
               Unit_Name,
6878
               Entity,
6879
               Parameter_Types,
6880
               Result_Type,
6881
               Source_Location);
6882
         end Eliminate;
6883
 
6884
         ------------
6885
         -- Export --
6886
         ------------
6887
 
6888
         --  pragma Export (
6889
         --    [   Convention    =>] convention_IDENTIFIER,
6890
         --    [   Entity        =>] local_NAME
6891
         --    [, [External_Name =>] static_string_EXPRESSION ]
6892
         --    [, [Link_Name     =>] static_string_EXPRESSION ]);
6893
 
6894
         when Pragma_Export => Export : declare
6895
            C      : Convention_Id;
6896
            Def_Id : Entity_Id;
6897
 
6898
            pragma Warnings (Off, C);
6899
 
6900
         begin
6901
            Check_Ada_83_Warning;
6902
            Check_Arg_Order
6903
              ((Name_Convention,
6904
                Name_Entity,
6905
                Name_External_Name,
6906
                Name_Link_Name));
6907
            Check_At_Least_N_Arguments (2);
6908
            Check_At_Most_N_Arguments  (4);
6909
            Process_Convention (C, Def_Id);
6910
 
6911
            if Ekind (Def_Id) /= E_Constant then
6912
               Note_Possible_Modification (Expression (Arg2), Sure => False);
6913
            end if;
6914
 
6915
            Process_Interface_Name (Def_Id, Arg3, Arg4);
6916
            Set_Exported (Def_Id, Arg2);
6917
 
6918
            --  If the entity is a deferred constant, propagate the information
6919
            --  to the full view, because gigi elaborates the full view only.
6920
 
6921
            if Ekind (Def_Id) = E_Constant
6922
              and then Present (Full_View (Def_Id))
6923
            then
6924
               declare
6925
                  Id2 : constant Entity_Id := Full_View (Def_Id);
6926
               begin
6927
                  Set_Is_Exported    (Id2, Is_Exported          (Def_Id));
6928
                  Set_First_Rep_Item (Id2, First_Rep_Item       (Def_Id));
6929
                  Set_Interface_Name (Id2, Einfo.Interface_Name (Def_Id));
6930
               end;
6931
            end if;
6932
         end Export;
6933
 
6934
         ----------------------
6935
         -- Export_Exception --
6936
         ----------------------
6937
 
6938
         --  pragma Export_Exception (
6939
         --        [Internal         =>] LOCAL_NAME
6940
         --     [, [External         =>] EXTERNAL_SYMBOL]
6941
         --     [, [Form     =>] Ada | VMS]
6942
         --     [, [Code     =>] static_integer_EXPRESSION]);
6943
 
6944
         when Pragma_Export_Exception => Export_Exception : declare
6945
            Args  : Args_List (1 .. 4);
6946
            Names : constant Name_List (1 .. 4) := (
6947
                      Name_Internal,
6948
                      Name_External,
6949
                      Name_Form,
6950
                      Name_Code);
6951
 
6952
            Internal : Node_Id renames Args (1);
6953
            External : Node_Id renames Args (2);
6954
            Form     : Node_Id renames Args (3);
6955
            Code     : Node_Id renames Args (4);
6956
 
6957
         begin
6958
            GNAT_Pragma;
6959
 
6960
            if Inside_A_Generic then
6961
               Error_Pragma ("pragma% cannot be used for generic entities");
6962
            end if;
6963
 
6964
            Gather_Associations (Names, Args);
6965
            Process_Extended_Import_Export_Exception_Pragma (
6966
              Arg_Internal => Internal,
6967
              Arg_External => External,
6968
              Arg_Form     => Form,
6969
              Arg_Code     => Code);
6970
 
6971
            if not Is_VMS_Exception (Entity (Internal)) then
6972
               Set_Exported (Entity (Internal), Internal);
6973
            end if;
6974
         end Export_Exception;
6975
 
6976
         ---------------------
6977
         -- Export_Function --
6978
         ---------------------
6979
 
6980
         --  pragma Export_Function (
6981
         --        [Internal         =>] LOCAL_NAME
6982
         --     [, [External         =>] EXTERNAL_SYMBOL]
6983
         --     [, [Parameter_Types  =>] (PARAMETER_TYPES)]
6984
         --     [, [Result_Type      =>] TYPE_DESIGNATOR]
6985
         --     [, [Mechanism        =>] MECHANISM]
6986
         --     [, [Result_Mechanism =>] MECHANISM_NAME]);
6987
 
6988
         --  EXTERNAL_SYMBOL ::=
6989
         --    IDENTIFIER
6990
         --  | static_string_EXPRESSION
6991
 
6992
         --  PARAMETER_TYPES ::=
6993
         --    null
6994
         --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
6995
 
6996
         --  TYPE_DESIGNATOR ::=
6997
         --    subtype_NAME
6998
         --  | subtype_Name ' Access
6999
 
7000
         --  MECHANISM ::=
7001
         --    MECHANISM_NAME
7002
         --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7003
 
7004
         --  MECHANISM_ASSOCIATION ::=
7005
         --    [formal_parameter_NAME =>] MECHANISM_NAME
7006
 
7007
         --  MECHANISM_NAME ::=
7008
         --    Value
7009
         --  | Reference
7010
         --  | Descriptor [([Class =>] CLASS_NAME)]
7011
 
7012
         --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7013
 
7014
         when Pragma_Export_Function => Export_Function : declare
7015
            Args  : Args_List (1 .. 6);
7016
            Names : constant Name_List (1 .. 6) := (
7017
                      Name_Internal,
7018
                      Name_External,
7019
                      Name_Parameter_Types,
7020
                      Name_Result_Type,
7021
                      Name_Mechanism,
7022
                      Name_Result_Mechanism);
7023
 
7024
            Internal         : Node_Id renames Args (1);
7025
            External         : Node_Id renames Args (2);
7026
            Parameter_Types  : Node_Id renames Args (3);
7027
            Result_Type      : Node_Id renames Args (4);
7028
            Mechanism        : Node_Id renames Args (5);
7029
            Result_Mechanism : Node_Id renames Args (6);
7030
 
7031
         begin
7032
            GNAT_Pragma;
7033
            Gather_Associations (Names, Args);
7034
            Process_Extended_Import_Export_Subprogram_Pragma (
7035
              Arg_Internal         => Internal,
7036
              Arg_External         => External,
7037
              Arg_Parameter_Types  => Parameter_Types,
7038
              Arg_Result_Type      => Result_Type,
7039
              Arg_Mechanism        => Mechanism,
7040
              Arg_Result_Mechanism => Result_Mechanism);
7041
         end Export_Function;
7042
 
7043
         -------------------
7044
         -- Export_Object --
7045
         -------------------
7046
 
7047
         --  pragma Export_Object (
7048
         --        [Internal =>] LOCAL_NAME
7049
         --     [, [External =>] EXTERNAL_SYMBOL]
7050
         --     [, [Size     =>] EXTERNAL_SYMBOL]);
7051
 
7052
         --  EXTERNAL_SYMBOL ::=
7053
         --    IDENTIFIER
7054
         --  | static_string_EXPRESSION
7055
 
7056
         --  PARAMETER_TYPES ::=
7057
         --    null
7058
         --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7059
 
7060
         --  TYPE_DESIGNATOR ::=
7061
         --    subtype_NAME
7062
         --  | subtype_Name ' Access
7063
 
7064
         --  MECHANISM ::=
7065
         --    MECHANISM_NAME
7066
         --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7067
 
7068
         --  MECHANISM_ASSOCIATION ::=
7069
         --    [formal_parameter_NAME =>] MECHANISM_NAME
7070
 
7071
         --  MECHANISM_NAME ::=
7072
         --    Value
7073
         --  | Reference
7074
         --  | Descriptor [([Class =>] CLASS_NAME)]
7075
 
7076
         --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7077
 
7078
         when Pragma_Export_Object => Export_Object : declare
7079
            Args  : Args_List (1 .. 3);
7080
            Names : constant Name_List (1 .. 3) := (
7081
                      Name_Internal,
7082
                      Name_External,
7083
                      Name_Size);
7084
 
7085
            Internal : Node_Id renames Args (1);
7086
            External : Node_Id renames Args (2);
7087
            Size     : Node_Id renames Args (3);
7088
 
7089
         begin
7090
            GNAT_Pragma;
7091
            Gather_Associations (Names, Args);
7092
            Process_Extended_Import_Export_Object_Pragma (
7093
              Arg_Internal => Internal,
7094
              Arg_External => External,
7095
              Arg_Size     => Size);
7096
         end Export_Object;
7097
 
7098
         ----------------------
7099
         -- Export_Procedure --
7100
         ----------------------
7101
 
7102
         --  pragma Export_Procedure (
7103
         --        [Internal         =>] LOCAL_NAME
7104
         --     [, [External         =>] EXTERNAL_SYMBOL]
7105
         --     [, [Parameter_Types  =>] (PARAMETER_TYPES)]
7106
         --     [, [Mechanism        =>] MECHANISM]);
7107
 
7108
         --  EXTERNAL_SYMBOL ::=
7109
         --    IDENTIFIER
7110
         --  | static_string_EXPRESSION
7111
 
7112
         --  PARAMETER_TYPES ::=
7113
         --    null
7114
         --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7115
 
7116
         --  TYPE_DESIGNATOR ::=
7117
         --    subtype_NAME
7118
         --  | subtype_Name ' Access
7119
 
7120
         --  MECHANISM ::=
7121
         --    MECHANISM_NAME
7122
         --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7123
 
7124
         --  MECHANISM_ASSOCIATION ::=
7125
         --    [formal_parameter_NAME =>] MECHANISM_NAME
7126
 
7127
         --  MECHANISM_NAME ::=
7128
         --    Value
7129
         --  | Reference
7130
         --  | Descriptor [([Class =>] CLASS_NAME)]
7131
 
7132
         --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7133
 
7134
         when Pragma_Export_Procedure => Export_Procedure : declare
7135
            Args  : Args_List (1 .. 4);
7136
            Names : constant Name_List (1 .. 4) := (
7137
                      Name_Internal,
7138
                      Name_External,
7139
                      Name_Parameter_Types,
7140
                      Name_Mechanism);
7141
 
7142
            Internal        : Node_Id renames Args (1);
7143
            External        : Node_Id renames Args (2);
7144
            Parameter_Types : Node_Id renames Args (3);
7145
            Mechanism       : Node_Id renames Args (4);
7146
 
7147
         begin
7148
            GNAT_Pragma;
7149
            Gather_Associations (Names, Args);
7150
            Process_Extended_Import_Export_Subprogram_Pragma (
7151
              Arg_Internal        => Internal,
7152
              Arg_External        => External,
7153
              Arg_Parameter_Types => Parameter_Types,
7154
              Arg_Mechanism       => Mechanism);
7155
         end Export_Procedure;
7156
 
7157
         ------------------
7158
         -- Export_Value --
7159
         ------------------
7160
 
7161
         --  pragma Export_Value (
7162
         --     [Value     =>] static_integer_EXPRESSION,
7163
         --     [Link_Name =>] static_string_EXPRESSION);
7164
 
7165
         when Pragma_Export_Value =>
7166
            GNAT_Pragma;
7167
            Check_Arg_Order ((Name_Value, Name_Link_Name));
7168
            Check_Arg_Count (2);
7169
 
7170
            Check_Optional_Identifier (Arg1, Name_Value);
7171
            Check_Arg_Is_Static_Expression (Arg1, Any_Integer);
7172
 
7173
            Check_Optional_Identifier (Arg2, Name_Link_Name);
7174
            Check_Arg_Is_Static_Expression (Arg2, Standard_String);
7175
 
7176
         -----------------------------
7177
         -- Export_Valued_Procedure --
7178
         -----------------------------
7179
 
7180
         --  pragma Export_Valued_Procedure (
7181
         --        [Internal         =>] LOCAL_NAME
7182
         --     [, [External         =>] EXTERNAL_SYMBOL,]
7183
         --     [, [Parameter_Types  =>] (PARAMETER_TYPES)]
7184
         --     [, [Mechanism        =>] MECHANISM]);
7185
 
7186
         --  EXTERNAL_SYMBOL ::=
7187
         --    IDENTIFIER
7188
         --  | static_string_EXPRESSION
7189
 
7190
         --  PARAMETER_TYPES ::=
7191
         --    null
7192
         --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7193
 
7194
         --  TYPE_DESIGNATOR ::=
7195
         --    subtype_NAME
7196
         --  | subtype_Name ' Access
7197
 
7198
         --  MECHANISM ::=
7199
         --    MECHANISM_NAME
7200
         --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7201
 
7202
         --  MECHANISM_ASSOCIATION ::=
7203
         --    [formal_parameter_NAME =>] MECHANISM_NAME
7204
 
7205
         --  MECHANISM_NAME ::=
7206
         --    Value
7207
         --  | Reference
7208
         --  | Descriptor [([Class =>] CLASS_NAME)]
7209
 
7210
         --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7211
 
7212
         when Pragma_Export_Valued_Procedure =>
7213
         Export_Valued_Procedure : declare
7214
            Args  : Args_List (1 .. 4);
7215
            Names : constant Name_List (1 .. 4) := (
7216
                      Name_Internal,
7217
                      Name_External,
7218
                      Name_Parameter_Types,
7219
                      Name_Mechanism);
7220
 
7221
            Internal        : Node_Id renames Args (1);
7222
            External        : Node_Id renames Args (2);
7223
            Parameter_Types : Node_Id renames Args (3);
7224
            Mechanism       : Node_Id renames Args (4);
7225
 
7226
         begin
7227
            GNAT_Pragma;
7228
            Gather_Associations (Names, Args);
7229
            Process_Extended_Import_Export_Subprogram_Pragma (
7230
              Arg_Internal        => Internal,
7231
              Arg_External        => External,
7232
              Arg_Parameter_Types => Parameter_Types,
7233
              Arg_Mechanism       => Mechanism);
7234
         end Export_Valued_Procedure;
7235
 
7236
         -------------------
7237
         -- Extend_System --
7238
         -------------------
7239
 
7240
         --  pragma Extend_System ([Name =>] Identifier);
7241
 
7242
         when Pragma_Extend_System => Extend_System : declare
7243
         begin
7244
            GNAT_Pragma;
7245
            Check_Valid_Configuration_Pragma;
7246
            Check_Arg_Count (1);
7247
            Check_Optional_Identifier (Arg1, Name_Name);
7248
            Check_Arg_Is_Identifier (Arg1);
7249
 
7250
            Get_Name_String (Chars (Expression (Arg1)));
7251
 
7252
            if Name_Len > 4
7253
              and then Name_Buffer (1 .. 4) = "aux_"
7254
            then
7255
               if Present (System_Extend_Pragma_Arg) then
7256
                  if Chars (Expression (Arg1)) =
7257
                     Chars (Expression (System_Extend_Pragma_Arg))
7258
                  then
7259
                     null;
7260
                  else
7261
                     Error_Msg_Sloc := Sloc (System_Extend_Pragma_Arg);
7262
                     Error_Pragma ("pragma% conflicts with that #");
7263
                  end if;
7264
 
7265
               else
7266
                  System_Extend_Pragma_Arg := Arg1;
7267
 
7268
                  if not GNAT_Mode then
7269
                     System_Extend_Unit := Arg1;
7270
                  end if;
7271
               end if;
7272
            else
7273
               Error_Pragma ("incorrect name for pragma%, must be Aux_xxx");
7274
            end if;
7275
         end Extend_System;
7276
 
7277
         ------------------------
7278
         -- Extensions_Allowed --
7279
         ------------------------
7280
 
7281
         --  pragma Extensions_Allowed (ON | OFF);
7282
 
7283
         when Pragma_Extensions_Allowed =>
7284
            GNAT_Pragma;
7285
            Check_Arg_Count (1);
7286
            Check_No_Identifiers;
7287
            Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
7288
 
7289
            if Chars (Expression (Arg1)) = Name_On then
7290
               Extensions_Allowed := True;
7291
            else
7292
               Extensions_Allowed := False;
7293
            end if;
7294
 
7295
         --------------
7296
         -- External --
7297
         --------------
7298
 
7299
         --  pragma External (
7300
         --    [   Convention    =>] convention_IDENTIFIER,
7301
         --    [   Entity        =>] local_NAME
7302
         --    [, [External_Name =>] static_string_EXPRESSION ]
7303
         --    [, [Link_Name     =>] static_string_EXPRESSION ]);
7304
 
7305
         when Pragma_External => External : declare
7306
               Def_Id : Entity_Id;
7307
 
7308
               C : Convention_Id;
7309
               pragma Warnings (Off, C);
7310
 
7311
         begin
7312
            GNAT_Pragma;
7313
            Check_Arg_Order
7314
              ((Name_Convention,
7315
                Name_Entity,
7316
                Name_External_Name,
7317
                Name_Link_Name));
7318
            Check_At_Least_N_Arguments (2);
7319
            Check_At_Most_N_Arguments  (4);
7320
            Process_Convention (C, Def_Id);
7321
            Note_Possible_Modification (Expression (Arg2), Sure => False);
7322
            Process_Interface_Name (Def_Id, Arg3, Arg4);
7323
            Set_Exported (Def_Id, Arg2);
7324
         end External;
7325
 
7326
         --------------------------
7327
         -- External_Name_Casing --
7328
         --------------------------
7329
 
7330
         --  pragma External_Name_Casing (
7331
         --    UPPERCASE | LOWERCASE
7332
         --    [, AS_IS | UPPERCASE | LOWERCASE]);
7333
 
7334
         when Pragma_External_Name_Casing => External_Name_Casing : declare
7335
         begin
7336
            GNAT_Pragma;
7337
            Check_No_Identifiers;
7338
 
7339
            if Arg_Count = 2 then
7340
               Check_Arg_Is_One_Of
7341
                 (Arg2, Name_As_Is, Name_Uppercase, Name_Lowercase);
7342
 
7343
               case Chars (Get_Pragma_Arg (Arg2)) is
7344
                  when Name_As_Is     =>
7345
                     Opt.External_Name_Exp_Casing := As_Is;
7346
 
7347
                  when Name_Uppercase =>
7348
                     Opt.External_Name_Exp_Casing := Uppercase;
7349
 
7350
                  when Name_Lowercase =>
7351
                     Opt.External_Name_Exp_Casing := Lowercase;
7352
 
7353
                  when others =>
7354
                     null;
7355
               end case;
7356
 
7357
            else
7358
               Check_Arg_Count (1);
7359
            end if;
7360
 
7361
            Check_Arg_Is_One_Of (Arg1, Name_Uppercase, Name_Lowercase);
7362
 
7363
            case Chars (Get_Pragma_Arg (Arg1)) is
7364
               when Name_Uppercase =>
7365
                  Opt.External_Name_Imp_Casing := Uppercase;
7366
 
7367
               when Name_Lowercase =>
7368
                  Opt.External_Name_Imp_Casing := Lowercase;
7369
 
7370
               when others =>
7371
                  null;
7372
            end case;
7373
         end External_Name_Casing;
7374
 
7375
         --------------------------
7376
         -- Favor_Top_Level --
7377
         --------------------------
7378
 
7379
         --  pragma Favor_Top_Level (type_NAME);
7380
 
7381
         when Pragma_Favor_Top_Level => Favor_Top_Level : declare
7382
               Named_Entity : Entity_Id;
7383
 
7384
         begin
7385
            GNAT_Pragma;
7386
            Check_No_Identifiers;
7387
            Check_Arg_Count (1);
7388
            Check_Arg_Is_Local_Name (Arg1);
7389
            Named_Entity := Entity (Expression (Arg1));
7390
 
7391
            --  If it's an access-to-subprogram type (in particular, not a
7392
            --  subtype), set the flag on that type.
7393
 
7394
            if Is_Access_Subprogram_Type (Named_Entity) then
7395
               Set_Can_Use_Internal_Rep (Named_Entity, False);
7396
 
7397
            --  Otherwise it's an error (name denotes the wrong sort of entity)
7398
 
7399
            else
7400
               Error_Pragma_Arg
7401
                 ("access-to-subprogram type expected", Expression (Arg1));
7402
            end if;
7403
         end Favor_Top_Level;
7404
 
7405
         ---------------
7406
         -- Fast_Math --
7407
         ---------------
7408
 
7409
         --  pragma Fast_Math;
7410
 
7411
         when Pragma_Fast_Math =>
7412
            GNAT_Pragma;
7413
            Check_No_Identifiers;
7414
            Check_Valid_Configuration_Pragma;
7415
            Fast_Math := True;
7416
 
7417
         ---------------------------
7418
         -- Finalize_Storage_Only --
7419
         ---------------------------
7420
 
7421
         --  pragma Finalize_Storage_Only (first_subtype_LOCAL_NAME);
7422
 
7423
         when Pragma_Finalize_Storage_Only => Finalize_Storage : declare
7424
            Assoc   : constant Node_Id := Arg1;
7425
            Type_Id : constant Node_Id := Expression (Assoc);
7426
            Typ     : Entity_Id;
7427
 
7428
         begin
7429
            GNAT_Pragma;
7430
            Check_No_Identifiers;
7431
            Check_Arg_Count (1);
7432
            Check_Arg_Is_Local_Name (Arg1);
7433
 
7434
            Find_Type (Type_Id);
7435
            Typ := Entity (Type_Id);
7436
 
7437
            if Typ = Any_Type
7438
              or else Rep_Item_Too_Early (Typ, N)
7439
            then
7440
               return;
7441
            else
7442
               Typ := Underlying_Type (Typ);
7443
            end if;
7444
 
7445
            if not Is_Controlled (Typ) then
7446
               Error_Pragma ("pragma% must specify controlled type");
7447
            end if;
7448
 
7449
            Check_First_Subtype (Arg1);
7450
 
7451
            if Finalize_Storage_Only (Typ) then
7452
               Error_Pragma ("duplicate pragma%, only one allowed");
7453
 
7454
            elsif not Rep_Item_Too_Late (Typ, N) then
7455
               Set_Finalize_Storage_Only (Base_Type (Typ), True);
7456
            end if;
7457
         end Finalize_Storage;
7458
 
7459
         --------------------------
7460
         -- Float_Representation --
7461
         --------------------------
7462
 
7463
         --  pragma Float_Representation (FLOAT_REP[, float_type_LOCAL_NAME]);
7464
 
7465
         --  FLOAT_REP ::= VAX_Float | IEEE_Float
7466
 
7467
         when Pragma_Float_Representation => Float_Representation : declare
7468
            Argx : Node_Id;
7469
            Digs : Nat;
7470
            Ent  : Entity_Id;
7471
 
7472
         begin
7473
            GNAT_Pragma;
7474
 
7475
            if Arg_Count = 1 then
7476
               Check_Valid_Configuration_Pragma;
7477
            else
7478
               Check_Arg_Count (2);
7479
               Check_Optional_Identifier (Arg2, Name_Entity);
7480
               Check_Arg_Is_Local_Name (Arg2);
7481
            end if;
7482
 
7483
            Check_No_Identifier (Arg1);
7484
            Check_Arg_Is_One_Of (Arg1, Name_VAX_Float, Name_IEEE_Float);
7485
 
7486
            if not OpenVMS_On_Target then
7487
               if Chars (Expression (Arg1)) = Name_VAX_Float then
7488
                  Error_Pragma
7489
                    ("?pragma% ignored (applies only to Open'V'M'S)");
7490
               end if;
7491
 
7492
               return;
7493
            end if;
7494
 
7495
            --  One argument case
7496
 
7497
            if Arg_Count = 1 then
7498
               if Chars (Expression (Arg1)) = Name_VAX_Float then
7499
                  if Opt.Float_Format = 'I' then
7500
                     Error_Pragma ("'I'E'E'E format previously specified");
7501
                  end if;
7502
 
7503
                  Opt.Float_Format := 'V';
7504
 
7505
               else
7506
                  if Opt.Float_Format = 'V' then
7507
                     Error_Pragma ("'V'A'X format previously specified");
7508
                  end if;
7509
 
7510
                  Opt.Float_Format := 'I';
7511
               end if;
7512
 
7513
               Set_Standard_Fpt_Formats;
7514
 
7515
            --  Two argument case
7516
 
7517
            else
7518
               Argx := Get_Pragma_Arg (Arg2);
7519
 
7520
               if not Is_Entity_Name (Argx)
7521
                 or else not Is_Floating_Point_Type (Entity (Argx))
7522
               then
7523
                  Error_Pragma_Arg
7524
                    ("second argument of% pragma must be floating-point type",
7525
                     Arg2);
7526
               end if;
7527
 
7528
               Ent  := Entity (Argx);
7529
               Digs := UI_To_Int (Digits_Value (Ent));
7530
 
7531
               --  Two arguments, VAX_Float case
7532
 
7533
               if Chars (Expression (Arg1)) = Name_VAX_Float then
7534
                  case Digs is
7535
                     when  6 => Set_F_Float (Ent);
7536
                     when  9 => Set_D_Float (Ent);
7537
                     when 15 => Set_G_Float (Ent);
7538
 
7539
                     when others =>
7540
                        Error_Pragma_Arg
7541
                          ("wrong digits value, must be 6,9 or 15", Arg2);
7542
                  end case;
7543
 
7544
               --  Two arguments, IEEE_Float case
7545
 
7546
               else
7547
                  case Digs is
7548
                     when  6 => Set_IEEE_Short (Ent);
7549
                     when 15 => Set_IEEE_Long  (Ent);
7550
 
7551
                     when others =>
7552
                        Error_Pragma_Arg
7553
                          ("wrong digits value, must be 6 or 15", Arg2);
7554
                  end case;
7555
               end if;
7556
            end if;
7557
         end Float_Representation;
7558
 
7559
         -----------
7560
         -- Ident --
7561
         -----------
7562
 
7563
         --  pragma Ident (static_string_EXPRESSION)
7564
 
7565
         --  Note: pragma Comment shares this processing. Pragma Comment is
7566
         --  identical to Ident, except that the restriction of the argument to
7567
         --  31 characters and the placement restrictions are not enforced for
7568
         --  pragma Comment.
7569
 
7570
         when Pragma_Ident | Pragma_Comment => Ident : declare
7571
            Str : Node_Id;
7572
 
7573
         begin
7574
            GNAT_Pragma;
7575
            Check_Arg_Count (1);
7576
            Check_No_Identifiers;
7577
            Check_Arg_Is_Static_Expression (Arg1, Standard_String);
7578
 
7579
            --  For pragma Ident, preserve DEC compatibility by requiring the
7580
            --  pragma to appear in a declarative part or package spec.
7581
 
7582
            if Prag_Id = Pragma_Ident then
7583
               Check_Is_In_Decl_Part_Or_Package_Spec;
7584
            end if;
7585
 
7586
            Str := Expr_Value_S (Expression (Arg1));
7587
 
7588
            declare
7589
               CS : Node_Id;
7590
               GP : Node_Id;
7591
 
7592
            begin
7593
               GP := Parent (Parent (N));
7594
 
7595
               if Nkind_In (GP, N_Package_Declaration,
7596
                                N_Generic_Package_Declaration)
7597
               then
7598
                  GP := Parent (GP);
7599
               end if;
7600
 
7601
               --  If we have a compilation unit, then record the ident value,
7602
               --  checking for improper duplication.
7603
 
7604
               if Nkind (GP) = N_Compilation_Unit then
7605
                  CS := Ident_String (Current_Sem_Unit);
7606
 
7607
                  if Present (CS) then
7608
 
7609
                     --  For Ident, we do not permit multiple instances
7610
 
7611
                     if Prag_Id = Pragma_Ident then
7612
                        Error_Pragma ("duplicate% pragma not permitted");
7613
 
7614
                     --  For Comment, we concatenate the string, unless we want
7615
                     --  to preserve the tree structure for ASIS.
7616
 
7617
                     elsif not ASIS_Mode then
7618
                        Start_String (Strval (CS));
7619
                        Store_String_Char (' ');
7620
                        Store_String_Chars (Strval (Str));
7621
                        Set_Strval (CS, End_String);
7622
                     end if;
7623
 
7624
                  else
7625
                     --  In VMS, the effect of IDENT is achieved by passing
7626
                     --  IDENTIFICATION=name as a --for-linker switch.
7627
 
7628
                     if OpenVMS_On_Target then
7629
                        Start_String;
7630
                        Store_String_Chars
7631
                          ("--for-linker=IDENTIFICATION=");
7632
                        String_To_Name_Buffer (Strval (Str));
7633
                        Store_String_Chars (Name_Buffer (1 .. Name_Len));
7634
 
7635
                        --  Only the last processed IDENT is saved. The main
7636
                        --  purpose is so an IDENT associated with a main
7637
                        --  procedure will be used in preference to an IDENT
7638
                        --  associated with a with'd package.
7639
 
7640
                        Replace_Linker_Option_String
7641
                          (End_String, "--for-linker=IDENTIFICATION=");
7642
                     end if;
7643
 
7644
                     Set_Ident_String (Current_Sem_Unit, Str);
7645
                  end if;
7646
 
7647
               --  For subunits, we just ignore the Ident, since in GNAT these
7648
               --  are not separate object files, and hence not separate units
7649
               --  in the unit table.
7650
 
7651
               elsif Nkind (GP) = N_Subunit then
7652
                  null;
7653
 
7654
               --  Otherwise we have a misplaced pragma Ident, but we ignore
7655
               --  this if we are in an instantiation, since it comes from
7656
               --  a generic, and has no relevance to the instantiation.
7657
 
7658
               elsif Prag_Id = Pragma_Ident then
7659
                  if Instantiation_Location (Loc) = No_Location then
7660
                     Error_Pragma ("pragma% only allowed at outer level");
7661
                  end if;
7662
               end if;
7663
            end;
7664
         end Ident;
7665
 
7666
         --------------------------
7667
         -- Implemented_By_Entry --
7668
         --------------------------
7669
 
7670
         --  pragma Implemented_By_Entry (DIRECT_NAME);
7671
 
7672
         when Pragma_Implemented_By_Entry => Implemented_By_Entry : declare
7673
            Ent : Entity_Id;
7674
 
7675
         begin
7676
            Ada_2005_Pragma;
7677
            Check_Arg_Count (1);
7678
            Check_No_Identifiers;
7679
            Check_Arg_Is_Identifier (Arg1);
7680
            Check_Arg_Is_Local_Name (Arg1);
7681
            Ent := Entity (Expression (Arg1));
7682
 
7683
            --  Pragma Implemented_By_Entry must be applied only to protected
7684
            --  synchronized or task interface primitives.
7685
 
7686
            if (Ekind (Ent) /= E_Function
7687
                  and then Ekind (Ent) /= E_Procedure)
7688
               or else not Present (First_Formal (Ent))
7689
               or else not Is_Concurrent_Interface (Etype (First_Formal (Ent)))
7690
            then
7691
               Error_Pragma_Arg
7692
                 ("pragma % must be applied to a concurrent interface " &
7693
                  "primitive", Arg1);
7694
 
7695
            else
7696
               if Einfo.Implemented_By_Entry (Ent)
7697
                 and then Warn_On_Redundant_Constructs
7698
               then
7699
                  Error_Pragma ("?duplicate pragma%!");
7700
               else
7701
                  Set_Implemented_By_Entry (Ent);
7702
               end if;
7703
            end if;
7704
         end Implemented_By_Entry;
7705
 
7706
         -----------------------
7707
         -- Implicit_Packing --
7708
         -----------------------
7709
 
7710
         --  pragma Implicit_Packing;
7711
 
7712
         when Pragma_Implicit_Packing =>
7713
            GNAT_Pragma;
7714
            Check_Arg_Count (0);
7715
            Implicit_Packing := True;
7716
 
7717
         ------------
7718
         -- Import --
7719
         ------------
7720
 
7721
         --  pragma Import (
7722
         --       [Convention    =>] convention_IDENTIFIER,
7723
         --       [Entity        =>] local_NAME
7724
         --    [, [External_Name =>] static_string_EXPRESSION ]
7725
         --    [, [Link_Name     =>] static_string_EXPRESSION ]);
7726
 
7727
         when Pragma_Import =>
7728
            Check_Ada_83_Warning;
7729
            Check_Arg_Order
7730
              ((Name_Convention,
7731
                Name_Entity,
7732
                Name_External_Name,
7733
                Name_Link_Name));
7734
            Check_At_Least_N_Arguments (2);
7735
            Check_At_Most_N_Arguments  (4);
7736
            Process_Import_Or_Interface;
7737
 
7738
         ----------------------
7739
         -- Import_Exception --
7740
         ----------------------
7741
 
7742
         --  pragma Import_Exception (
7743
         --        [Internal         =>] LOCAL_NAME
7744
         --     [, [External         =>] EXTERNAL_SYMBOL]
7745
         --     [, [Form     =>] Ada | VMS]
7746
         --     [, [Code     =>] static_integer_EXPRESSION]);
7747
 
7748
         when Pragma_Import_Exception => Import_Exception : declare
7749
            Args  : Args_List (1 .. 4);
7750
            Names : constant Name_List (1 .. 4) := (
7751
                      Name_Internal,
7752
                      Name_External,
7753
                      Name_Form,
7754
                      Name_Code);
7755
 
7756
            Internal : Node_Id renames Args (1);
7757
            External : Node_Id renames Args (2);
7758
            Form     : Node_Id renames Args (3);
7759
            Code     : Node_Id renames Args (4);
7760
 
7761
         begin
7762
            GNAT_Pragma;
7763
            Gather_Associations (Names, Args);
7764
 
7765
            if Present (External) and then Present (Code) then
7766
               Error_Pragma
7767
                 ("cannot give both External and Code options for pragma%");
7768
            end if;
7769
 
7770
            Process_Extended_Import_Export_Exception_Pragma (
7771
              Arg_Internal => Internal,
7772
              Arg_External => External,
7773
              Arg_Form     => Form,
7774
              Arg_Code     => Code);
7775
 
7776
            if not Is_VMS_Exception (Entity (Internal)) then
7777
               Set_Imported (Entity (Internal));
7778
            end if;
7779
         end Import_Exception;
7780
 
7781
         ---------------------
7782
         -- Import_Function --
7783
         ---------------------
7784
 
7785
         --  pragma Import_Function (
7786
         --        [Internal                 =>] LOCAL_NAME,
7787
         --     [, [External                 =>] EXTERNAL_SYMBOL]
7788
         --     [, [Parameter_Types          =>] (PARAMETER_TYPES)]
7789
         --     [, [Result_Type              =>] SUBTYPE_MARK]
7790
         --     [, [Mechanism                =>] MECHANISM]
7791
         --     [, [Result_Mechanism         =>] MECHANISM_NAME]
7792
         --     [, [First_Optional_Parameter =>] IDENTIFIER]);
7793
 
7794
         --  EXTERNAL_SYMBOL ::=
7795
         --    IDENTIFIER
7796
         --  | static_string_EXPRESSION
7797
 
7798
         --  PARAMETER_TYPES ::=
7799
         --    null
7800
         --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7801
 
7802
         --  TYPE_DESIGNATOR ::=
7803
         --    subtype_NAME
7804
         --  | subtype_Name ' Access
7805
 
7806
         --  MECHANISM ::=
7807
         --    MECHANISM_NAME
7808
         --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7809
 
7810
         --  MECHANISM_ASSOCIATION ::=
7811
         --    [formal_parameter_NAME =>] MECHANISM_NAME
7812
 
7813
         --  MECHANISM_NAME ::=
7814
         --    Value
7815
         --  | Reference
7816
         --  | Descriptor [([Class =>] CLASS_NAME)]
7817
 
7818
         --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7819
 
7820
         when Pragma_Import_Function => Import_Function : declare
7821
            Args  : Args_List (1 .. 7);
7822
            Names : constant Name_List (1 .. 7) := (
7823
                      Name_Internal,
7824
                      Name_External,
7825
                      Name_Parameter_Types,
7826
                      Name_Result_Type,
7827
                      Name_Mechanism,
7828
                      Name_Result_Mechanism,
7829
                      Name_First_Optional_Parameter);
7830
 
7831
            Internal                 : Node_Id renames Args (1);
7832
            External                 : Node_Id renames Args (2);
7833
            Parameter_Types          : Node_Id renames Args (3);
7834
            Result_Type              : Node_Id renames Args (4);
7835
            Mechanism                : Node_Id renames Args (5);
7836
            Result_Mechanism         : Node_Id renames Args (6);
7837
            First_Optional_Parameter : Node_Id renames Args (7);
7838
 
7839
         begin
7840
            GNAT_Pragma;
7841
            Gather_Associations (Names, Args);
7842
            Process_Extended_Import_Export_Subprogram_Pragma (
7843
              Arg_Internal                 => Internal,
7844
              Arg_External                 => External,
7845
              Arg_Parameter_Types          => Parameter_Types,
7846
              Arg_Result_Type              => Result_Type,
7847
              Arg_Mechanism                => Mechanism,
7848
              Arg_Result_Mechanism         => Result_Mechanism,
7849
              Arg_First_Optional_Parameter => First_Optional_Parameter);
7850
         end Import_Function;
7851
 
7852
         -------------------
7853
         -- Import_Object --
7854
         -------------------
7855
 
7856
         --  pragma Import_Object (
7857
         --        [Internal =>] LOCAL_NAME
7858
         --     [, [External =>] EXTERNAL_SYMBOL]
7859
         --     [, [Size     =>] EXTERNAL_SYMBOL]);
7860
 
7861
         --  EXTERNAL_SYMBOL ::=
7862
         --    IDENTIFIER
7863
         --  | static_string_EXPRESSION
7864
 
7865
         when Pragma_Import_Object => Import_Object : declare
7866
            Args  : Args_List (1 .. 3);
7867
            Names : constant Name_List (1 .. 3) := (
7868
                      Name_Internal,
7869
                      Name_External,
7870
                      Name_Size);
7871
 
7872
            Internal : Node_Id renames Args (1);
7873
            External : Node_Id renames Args (2);
7874
            Size     : Node_Id renames Args (3);
7875
 
7876
         begin
7877
            GNAT_Pragma;
7878
            Gather_Associations (Names, Args);
7879
            Process_Extended_Import_Export_Object_Pragma (
7880
              Arg_Internal => Internal,
7881
              Arg_External => External,
7882
              Arg_Size     => Size);
7883
         end Import_Object;
7884
 
7885
         ----------------------
7886
         -- Import_Procedure --
7887
         ----------------------
7888
 
7889
         --  pragma Import_Procedure (
7890
         --        [Internal                 =>] LOCAL_NAME
7891
         --     [, [External                 =>] EXTERNAL_SYMBOL]
7892
         --     [, [Parameter_Types          =>] (PARAMETER_TYPES)]
7893
         --     [, [Mechanism                =>] MECHANISM]
7894
         --     [, [First_Optional_Parameter =>] IDENTIFIER]);
7895
 
7896
         --  EXTERNAL_SYMBOL ::=
7897
         --    IDENTIFIER
7898
         --  | static_string_EXPRESSION
7899
 
7900
         --  PARAMETER_TYPES ::=
7901
         --    null
7902
         --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7903
 
7904
         --  TYPE_DESIGNATOR ::=
7905
         --    subtype_NAME
7906
         --  | subtype_Name ' Access
7907
 
7908
         --  MECHANISM ::=
7909
         --    MECHANISM_NAME
7910
         --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7911
 
7912
         --  MECHANISM_ASSOCIATION ::=
7913
         --    [formal_parameter_NAME =>] MECHANISM_NAME
7914
 
7915
         --  MECHANISM_NAME ::=
7916
         --    Value
7917
         --  | Reference
7918
         --  | Descriptor [([Class =>] CLASS_NAME)]
7919
 
7920
         --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7921
 
7922
         when Pragma_Import_Procedure => Import_Procedure : declare
7923
            Args  : Args_List (1 .. 5);
7924
            Names : constant Name_List (1 .. 5) := (
7925
                      Name_Internal,
7926
                      Name_External,
7927
                      Name_Parameter_Types,
7928
                      Name_Mechanism,
7929
                      Name_First_Optional_Parameter);
7930
 
7931
            Internal                 : Node_Id renames Args (1);
7932
            External                 : Node_Id renames Args (2);
7933
            Parameter_Types          : Node_Id renames Args (3);
7934
            Mechanism                : Node_Id renames Args (4);
7935
            First_Optional_Parameter : Node_Id renames Args (5);
7936
 
7937
         begin
7938
            GNAT_Pragma;
7939
            Gather_Associations (Names, Args);
7940
            Process_Extended_Import_Export_Subprogram_Pragma (
7941
              Arg_Internal                 => Internal,
7942
              Arg_External                 => External,
7943
              Arg_Parameter_Types          => Parameter_Types,
7944
              Arg_Mechanism                => Mechanism,
7945
              Arg_First_Optional_Parameter => First_Optional_Parameter);
7946
         end Import_Procedure;
7947
 
7948
         -----------------------------
7949
         -- Import_Valued_Procedure --
7950
         -----------------------------
7951
 
7952
         --  pragma Import_Valued_Procedure (
7953
         --        [Internal                 =>] LOCAL_NAME
7954
         --     [, [External                 =>] EXTERNAL_SYMBOL]
7955
         --     [, [Parameter_Types          =>] (PARAMETER_TYPES)]
7956
         --     [, [Mechanism                =>] MECHANISM]
7957
         --     [, [First_Optional_Parameter =>] IDENTIFIER]);
7958
 
7959
         --  EXTERNAL_SYMBOL ::=
7960
         --    IDENTIFIER
7961
         --  | static_string_EXPRESSION
7962
 
7963
         --  PARAMETER_TYPES ::=
7964
         --    null
7965
         --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7966
 
7967
         --  TYPE_DESIGNATOR ::=
7968
         --    subtype_NAME
7969
         --  | subtype_Name ' Access
7970
 
7971
         --  MECHANISM ::=
7972
         --    MECHANISM_NAME
7973
         --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7974
 
7975
         --  MECHANISM_ASSOCIATION ::=
7976
         --    [formal_parameter_NAME =>] MECHANISM_NAME
7977
 
7978
         --  MECHANISM_NAME ::=
7979
         --    Value
7980
         --  | Reference
7981
         --  | Descriptor [([Class =>] CLASS_NAME)]
7982
 
7983
         --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7984
 
7985
         when Pragma_Import_Valued_Procedure =>
7986
         Import_Valued_Procedure : declare
7987
            Args  : Args_List (1 .. 5);
7988
            Names : constant Name_List (1 .. 5) := (
7989
                      Name_Internal,
7990
                      Name_External,
7991
                      Name_Parameter_Types,
7992
                      Name_Mechanism,
7993
                      Name_First_Optional_Parameter);
7994
 
7995
            Internal                 : Node_Id renames Args (1);
7996
            External                 : Node_Id renames Args (2);
7997
            Parameter_Types          : Node_Id renames Args (3);
7998
            Mechanism                : Node_Id renames Args (4);
7999
            First_Optional_Parameter : Node_Id renames Args (5);
8000
 
8001
         begin
8002
            GNAT_Pragma;
8003
            Gather_Associations (Names, Args);
8004
            Process_Extended_Import_Export_Subprogram_Pragma (
8005
              Arg_Internal                 => Internal,
8006
              Arg_External                 => External,
8007
              Arg_Parameter_Types          => Parameter_Types,
8008
              Arg_Mechanism                => Mechanism,
8009
              Arg_First_Optional_Parameter => First_Optional_Parameter);
8010
         end Import_Valued_Procedure;
8011
 
8012
         ------------------------
8013
         -- Initialize_Scalars --
8014
         ------------------------
8015
 
8016
         --  pragma Initialize_Scalars;
8017
 
8018
         when Pragma_Initialize_Scalars =>
8019
            GNAT_Pragma;
8020
            Check_Arg_Count (0);
8021
            Check_Valid_Configuration_Pragma;
8022
            Check_Restriction (No_Initialize_Scalars, N);
8023
 
8024
            --  Initialize_Scalars creates false positives in CodePeer,
8025
            --  so ignore this pragma in this mode.
8026
 
8027
            if not Restriction_Active (No_Initialize_Scalars)
8028
              and then not CodePeer_Mode
8029
            then
8030
               Init_Or_Norm_Scalars := True;
8031
               Initialize_Scalars := True;
8032
            end if;
8033
 
8034
         ------------
8035
         -- Inline --
8036
         ------------
8037
 
8038
         --  pragma Inline ( NAME {, NAME} );
8039
 
8040
         when Pragma_Inline =>
8041
 
8042
            --  Pragma is active if inlining option is active
8043
 
8044
            Process_Inline (Inline_Active);
8045
 
8046
         -------------------
8047
         -- Inline_Always --
8048
         -------------------
8049
 
8050
         --  pragma Inline_Always ( NAME {, NAME} );
8051
 
8052
         when Pragma_Inline_Always =>
8053
            GNAT_Pragma;
8054
            Process_Inline (True);
8055
 
8056
         --------------------
8057
         -- Inline_Generic --
8058
         --------------------
8059
 
8060
         --  pragma Inline_Generic (NAME {, NAME});
8061
 
8062
         when Pragma_Inline_Generic =>
8063
            GNAT_Pragma;
8064
            Process_Generic_List;
8065
 
8066
         ----------------------
8067
         -- Inspection_Point --
8068
         ----------------------
8069
 
8070
         --  pragma Inspection_Point [(object_NAME {, object_NAME})];
8071
 
8072
         when Pragma_Inspection_Point => Inspection_Point : declare
8073
            Arg : Node_Id;
8074
            Exp : Node_Id;
8075
 
8076
         begin
8077
            if Arg_Count > 0 then
8078
               Arg := Arg1;
8079
               loop
8080
                  Exp := Expression (Arg);
8081
                  Analyze (Exp);
8082
 
8083
                  if not Is_Entity_Name (Exp)
8084
                    or else not Is_Object (Entity (Exp))
8085
                  then
8086
                     Error_Pragma_Arg ("object name required", Arg);
8087
                  end if;
8088
 
8089
                  Next (Arg);
8090
                  exit when No (Arg);
8091
               end loop;
8092
            end if;
8093
         end Inspection_Point;
8094
 
8095
         ---------------
8096
         -- Interface --
8097
         ---------------
8098
 
8099
         --  pragma Interface (
8100
         --    [   Convention    =>] convention_IDENTIFIER,
8101
         --    [   Entity        =>] local_NAME
8102
         --    [, [External_Name =>] static_string_EXPRESSION ]
8103
         --    [, [Link_Name     =>] static_string_EXPRESSION ]);
8104
 
8105
         when Pragma_Interface =>
8106
            GNAT_Pragma;
8107
            Check_Arg_Order
8108
              ((Name_Convention,
8109
                Name_Entity,
8110
                Name_External_Name,
8111
                Name_Link_Name));
8112
            Check_At_Least_N_Arguments (2);
8113
            Check_At_Most_N_Arguments  (4);
8114
            Process_Import_Or_Interface;
8115
 
8116
         --------------------
8117
         -- Interface_Name --
8118
         --------------------
8119
 
8120
         --  pragma Interface_Name (
8121
         --    [  Entity        =>] local_NAME
8122
         --    [,[External_Name =>] static_string_EXPRESSION ]
8123
         --    [,[Link_Name     =>] static_string_EXPRESSION ]);
8124
 
8125
         when Pragma_Interface_Name => Interface_Name : declare
8126
            Id     : Node_Id;
8127
            Def_Id : Entity_Id;
8128
            Hom_Id : Entity_Id;
8129
            Found  : Boolean;
8130
 
8131
         begin
8132
            GNAT_Pragma;
8133
            Check_Arg_Order
8134
              ((Name_Entity, Name_External_Name, Name_Link_Name));
8135
            Check_At_Least_N_Arguments (2);
8136
            Check_At_Most_N_Arguments  (3);
8137
            Id := Expression (Arg1);
8138
            Analyze (Id);
8139
 
8140
            if not Is_Entity_Name (Id) then
8141
               Error_Pragma_Arg
8142
                 ("first argument for pragma% must be entity name", Arg1);
8143
            elsif Etype (Id) = Any_Type then
8144
               return;
8145
            else
8146
               Def_Id := Entity (Id);
8147
            end if;
8148
 
8149
            --  Special DEC-compatible processing for the object case, forces
8150
            --  object to be imported.
8151
 
8152
            if Ekind (Def_Id) = E_Variable then
8153
               Kill_Size_Check_Code (Def_Id);
8154
               Note_Possible_Modification (Id, Sure => False);
8155
 
8156
               --  Initialization is not allowed for imported variable
8157
 
8158
               if Present (Expression (Parent (Def_Id)))
8159
                 and then Comes_From_Source (Expression (Parent (Def_Id)))
8160
               then
8161
                  Error_Msg_Sloc := Sloc (Def_Id);
8162
                  Error_Pragma_Arg
8163
                    ("no initialization allowed for declaration of& #",
8164
                     Arg2);
8165
 
8166
               else
8167
                  --  For compatibility, support VADS usage of providing both
8168
                  --  pragmas Interface and Interface_Name to obtain the effect
8169
                  --  of a single Import pragma.
8170
 
8171
                  if Is_Imported (Def_Id)
8172
                    and then Present (First_Rep_Item (Def_Id))
8173
                    and then Nkind (First_Rep_Item (Def_Id)) = N_Pragma
8174
                    and then
8175
                      Pragma_Name (First_Rep_Item (Def_Id)) = Name_Interface
8176
                  then
8177
                     null;
8178
                  else
8179
                     Set_Imported (Def_Id);
8180
                  end if;
8181
 
8182
                  Set_Is_Public (Def_Id);
8183
                  Process_Interface_Name (Def_Id, Arg2, Arg3);
8184
               end if;
8185
 
8186
            --  Otherwise must be subprogram
8187
 
8188
            elsif not Is_Subprogram (Def_Id) then
8189
               Error_Pragma_Arg
8190
                 ("argument of pragma% is not subprogram", Arg1);
8191
 
8192
            else
8193
               Check_At_Most_N_Arguments (3);
8194
               Hom_Id := Def_Id;
8195
               Found := False;
8196
 
8197
               --  Loop through homonyms
8198
 
8199
               loop
8200
                  Def_Id := Get_Base_Subprogram (Hom_Id);
8201
 
8202
                  if Is_Imported (Def_Id) then
8203
                     Process_Interface_Name (Def_Id, Arg2, Arg3);
8204
                     Found := True;
8205
                  end if;
8206
 
8207
                  Hom_Id := Homonym (Hom_Id);
8208
 
8209
                  exit when No (Hom_Id)
8210
                    or else Scope (Hom_Id) /= Current_Scope;
8211
               end loop;
8212
 
8213
               if not Found then
8214
                  Error_Pragma_Arg
8215
                    ("argument of pragma% is not imported subprogram",
8216
                     Arg1);
8217
               end if;
8218
            end if;
8219
         end Interface_Name;
8220
 
8221
         -----------------------
8222
         -- Interrupt_Handler --
8223
         -----------------------
8224
 
8225
         --  pragma Interrupt_Handler (handler_NAME);
8226
 
8227
         when Pragma_Interrupt_Handler =>
8228
            Check_Ada_83_Warning;
8229
            Check_Arg_Count (1);
8230
            Check_No_Identifiers;
8231
 
8232
            if No_Run_Time_Mode then
8233
               Error_Msg_CRT ("Interrupt_Handler pragma", N);
8234
            else
8235
               Check_Interrupt_Or_Attach_Handler;
8236
               Process_Interrupt_Or_Attach_Handler;
8237
            end if;
8238
 
8239
         ------------------------
8240
         -- Interrupt_Priority --
8241
         ------------------------
8242
 
8243
         --  pragma Interrupt_Priority [(EXPRESSION)];
8244
 
8245
         when Pragma_Interrupt_Priority => Interrupt_Priority : declare
8246
            P   : constant Node_Id := Parent (N);
8247
            Arg : Node_Id;
8248
 
8249
         begin
8250
            Check_Ada_83_Warning;
8251
 
8252
            if Arg_Count /= 0 then
8253
               Arg := Expression (Arg1);
8254
               Check_Arg_Count (1);
8255
               Check_No_Identifiers;
8256
 
8257
               --  The expression must be analyzed in the special manner
8258
               --  described in "Handling of Default and Per-Object
8259
               --  Expressions" in sem.ads.
8260
 
8261
               Preanalyze_Spec_Expression (Arg, RTE (RE_Interrupt_Priority));
8262
            end if;
8263
 
8264
            if not Nkind_In (P, N_Task_Definition, N_Protected_Definition) then
8265
               Pragma_Misplaced;
8266
               return;
8267
 
8268
            elsif Has_Priority_Pragma (P) then
8269
               Error_Pragma ("duplicate pragma% not allowed");
8270
 
8271
            else
8272
               Set_Has_Priority_Pragma (P, True);
8273
               Record_Rep_Item (Defining_Identifier (Parent (P)), N);
8274
            end if;
8275
         end Interrupt_Priority;
8276
 
8277
         ---------------------
8278
         -- Interrupt_State --
8279
         ---------------------
8280
 
8281
         --  pragma Interrupt_State (
8282
         --    [Name  =>] INTERRUPT_ID,
8283
         --    [State =>] INTERRUPT_STATE);
8284
 
8285
         --  INTERRUPT_ID => IDENTIFIER | static_integer_EXPRESSION
8286
         --  INTERRUPT_STATE => System | Runtime | User
8287
 
8288
         --  Note: if the interrupt id is given as an identifier, then it must
8289
         --  be one of the identifiers in Ada.Interrupts.Names. Otherwise it is
8290
         --  given as a static integer expression which must be in the range of
8291
         --  Ada.Interrupts.Interrupt_ID.
8292
 
8293
         when Pragma_Interrupt_State => Interrupt_State : declare
8294
 
8295
            Int_Id : constant Entity_Id := RTE (RE_Interrupt_ID);
8296
            --  This is the entity Ada.Interrupts.Interrupt_ID;
8297
 
8298
            State_Type : Character;
8299
            --  Set to 's'/'r'/'u' for System/Runtime/User
8300
 
8301
            IST_Num : Pos;
8302
            --  Index to entry in Interrupt_States table
8303
 
8304
            Int_Val : Uint;
8305
            --  Value of interrupt
8306
 
8307
            Arg1X : constant Node_Id := Get_Pragma_Arg (Arg1);
8308
            --  The first argument to the pragma
8309
 
8310
            Int_Ent : Entity_Id;
8311
            --  Interrupt entity in Ada.Interrupts.Names
8312
 
8313
         begin
8314
            GNAT_Pragma;
8315
            Check_Arg_Order ((Name_Name, Name_State));
8316
            Check_Arg_Count (2);
8317
 
8318
            Check_Optional_Identifier (Arg1, Name_Name);
8319
            Check_Optional_Identifier (Arg2, Name_State);
8320
            Check_Arg_Is_Identifier (Arg2);
8321
 
8322
            --  First argument is identifier
8323
 
8324
            if Nkind (Arg1X) = N_Identifier then
8325
 
8326
               --  Search list of names in Ada.Interrupts.Names
8327
 
8328
               Int_Ent := First_Entity (RTE (RE_Names));
8329
               loop
8330
                  if No (Int_Ent) then
8331
                     Error_Pragma_Arg ("invalid interrupt name", Arg1);
8332
 
8333
                  elsif Chars (Int_Ent) = Chars (Arg1X) then
8334
                     Int_Val := Expr_Value (Constant_Value (Int_Ent));
8335
                     exit;
8336
                  end if;
8337
 
8338
                  Next_Entity (Int_Ent);
8339
               end loop;
8340
 
8341
            --  First argument is not an identifier, so it must be a static
8342
            --  expression of type Ada.Interrupts.Interrupt_ID.
8343
 
8344
            else
8345
               Check_Arg_Is_Static_Expression (Arg1, Any_Integer);
8346
               Int_Val := Expr_Value (Arg1X);
8347
 
8348
               if Int_Val < Expr_Value (Type_Low_Bound (Int_Id))
8349
                    or else
8350
                  Int_Val > Expr_Value (Type_High_Bound (Int_Id))
8351
               then
8352
                  Error_Pragma_Arg
8353
                    ("value not in range of type " &
8354
                     """Ada.Interrupts.Interrupt_'I'D""", Arg1);
8355
               end if;
8356
            end if;
8357
 
8358
            --  Check OK state
8359
 
8360
            case Chars (Get_Pragma_Arg (Arg2)) is
8361
               when Name_Runtime => State_Type := 'r';
8362
               when Name_System  => State_Type := 's';
8363
               when Name_User    => State_Type := 'u';
8364
 
8365
               when others =>
8366
                  Error_Pragma_Arg ("invalid interrupt state", Arg2);
8367
            end case;
8368
 
8369
            --  Check if entry is already stored
8370
 
8371
            IST_Num := Interrupt_States.First;
8372
            loop
8373
               --  If entry not found, add it
8374
 
8375
               if IST_Num > Interrupt_States.Last then
8376
                  Interrupt_States.Append
8377
                    ((Interrupt_Number => UI_To_Int (Int_Val),
8378
                      Interrupt_State  => State_Type,
8379
                      Pragma_Loc       => Loc));
8380
                  exit;
8381
 
8382
               --  Case of entry for the same entry
8383
 
8384
               elsif Int_Val = Interrupt_States.Table (IST_Num).
8385
                                                           Interrupt_Number
8386
               then
8387
                  --  If state matches, done, no need to make redundant entry
8388
 
8389
                  exit when
8390
                    State_Type = Interrupt_States.Table (IST_Num).
8391
                                                           Interrupt_State;
8392
 
8393
                  --  Otherwise if state does not match, error
8394
 
8395
                  Error_Msg_Sloc :=
8396
                    Interrupt_States.Table (IST_Num).Pragma_Loc;
8397
                  Error_Pragma_Arg
8398
                    ("state conflicts with that given #", Arg2);
8399
                  exit;
8400
               end if;
8401
 
8402
               IST_Num := IST_Num + 1;
8403
            end loop;
8404
         end Interrupt_State;
8405
 
8406
         ----------------------
8407
         -- Java_Constructor --
8408
         ----------------------
8409
 
8410
         --  pragma Java_Constructor ([Entity =>] LOCAL_NAME);
8411
 
8412
         --  Also handles pragma CIL_Constructor
8413
 
8414
         when Pragma_CIL_Constructor | Pragma_Java_Constructor =>
8415
         Java_Constructor : declare
8416
            Id         : Entity_Id;
8417
            Def_Id     : Entity_Id;
8418
            Hom_Id     : Entity_Id;
8419
            Convention : Convention_Id;
8420
 
8421
         begin
8422
            GNAT_Pragma;
8423
            Check_Arg_Count (1);
8424
            Check_Optional_Identifier (Arg1, Name_Entity);
8425
            Check_Arg_Is_Local_Name (Arg1);
8426
 
8427
            Id := Expression (Arg1);
8428
            Find_Program_Unit_Name (Id);
8429
 
8430
            --  If we did not find the name, we are done
8431
 
8432
            if Etype (Id) = Any_Type then
8433
               return;
8434
            end if;
8435
 
8436
            case Prag_Id is
8437
               when Pragma_CIL_Constructor  => Convention := Convention_CIL;
8438
               when Pragma_Java_Constructor => Convention := Convention_Java;
8439
               when others                  => null;
8440
            end case;
8441
 
8442
            Hom_Id := Entity (Id);
8443
 
8444
            --  Loop through homonyms
8445
 
8446
            loop
8447
               Def_Id := Get_Base_Subprogram (Hom_Id);
8448
 
8449
               --  The constructor is required to be a function returning an
8450
               --  access type whose designated type has convention Java/CIL.
8451
 
8452
               if Ekind (Def_Id) = E_Function
8453
                 and then
8454
                   (Is_Value_Type (Etype (Def_Id))
8455
                     or else
8456
                       (Ekind (Etype (Def_Id)) = E_Access_Subprogram_Type
8457
                         and then
8458
                          Atree.Convention (Etype (Def_Id)) = Convention)
8459
                     or else
8460
                       (Ekind (Etype (Def_Id)) in Access_Kind
8461
                         and then
8462
                          (Atree.Convention
8463
                             (Designated_Type (Etype (Def_Id))) = Convention
8464
                            or else
8465
                              Atree.Convention
8466
                               (Root_Type (Designated_Type (Etype (Def_Id)))) =
8467
                                                                 Convention)))
8468
               then
8469
                  Set_Is_Constructor (Def_Id);
8470
                  Set_Convention     (Def_Id, Convention);
8471
                  Set_Is_Imported    (Def_Id);
8472
 
8473
               else
8474
                  if Convention = Convention_Java then
8475
                     Error_Pragma_Arg
8476
                       ("pragma% requires function returning a " &
8477
                        "'Java access type", Arg1);
8478
                  else
8479
                     pragma Assert (Convention = Convention_CIL);
8480
                     Error_Pragma_Arg
8481
                       ("pragma% requires function returning a " &
8482
                        "'C'I'L access type", Arg1);
8483
                  end if;
8484
               end if;
8485
 
8486
               Hom_Id := Homonym (Hom_Id);
8487
 
8488
               exit when No (Hom_Id) or else Scope (Hom_Id) /= Current_Scope;
8489
            end loop;
8490
         end Java_Constructor;
8491
 
8492
         ----------------------
8493
         -- Java_Interface --
8494
         ----------------------
8495
 
8496
         --  pragma Java_Interface ([Entity =>] LOCAL_NAME);
8497
 
8498
         when Pragma_Java_Interface => Java_Interface : declare
8499
            Arg : Node_Id;
8500
            Typ : Entity_Id;
8501
 
8502
         begin
8503
            GNAT_Pragma;
8504
            Check_Arg_Count (1);
8505
            Check_Optional_Identifier (Arg1, Name_Entity);
8506
            Check_Arg_Is_Local_Name (Arg1);
8507
 
8508
            Arg := Expression (Arg1);
8509
            Analyze (Arg);
8510
 
8511
            if Etype (Arg) = Any_Type then
8512
               return;
8513
            end if;
8514
 
8515
            if not Is_Entity_Name (Arg)
8516
              or else not Is_Type (Entity (Arg))
8517
            then
8518
               Error_Pragma_Arg ("pragma% requires a type mark", Arg1);
8519
            end if;
8520
 
8521
            Typ := Underlying_Type (Entity (Arg));
8522
 
8523
            --  For now simply check some of the semantic constraints on the
8524
            --  type. This currently leaves out some restrictions on interface
8525
            --  types, namely that the parent type must be java.lang.Object.Typ
8526
            --  and that all primitives of the type should be declared
8527
            --  abstract. ???
8528
 
8529
            if not Is_Tagged_Type (Typ) or else not Is_Abstract_Type (Typ) then
8530
               Error_Pragma_Arg ("pragma% requires an abstract "
8531
                 & "tagged type", Arg1);
8532
 
8533
            elsif not Has_Discriminants (Typ)
8534
              or else Ekind (Etype (First_Discriminant (Typ)))
8535
                        /= E_Anonymous_Access_Type
8536
              or else
8537
                not Is_Class_Wide_Type
8538
                      (Designated_Type (Etype (First_Discriminant (Typ))))
8539
            then
8540
               Error_Pragma_Arg
8541
                 ("type must have a class-wide access discriminant", Arg1);
8542
            end if;
8543
         end Java_Interface;
8544
 
8545
         ----------------
8546
         -- Keep_Names --
8547
         ----------------
8548
 
8549
         --  pragma Keep_Names ([On => ] local_NAME);
8550
 
8551
         when Pragma_Keep_Names => Keep_Names : declare
8552
            Arg : Node_Id;
8553
 
8554
         begin
8555
            GNAT_Pragma;
8556
            Check_Arg_Count (1);
8557
            Check_Optional_Identifier (Arg1, Name_On);
8558
            Check_Arg_Is_Local_Name (Arg1);
8559
 
8560
            Arg := Expression (Arg1);
8561
            Analyze (Arg);
8562
 
8563
            if Etype (Arg) = Any_Type then
8564
               return;
8565
            end if;
8566
 
8567
            if not Is_Entity_Name (Arg)
8568
              or else Ekind (Entity (Arg)) /= E_Enumeration_Type
8569
            then
8570
               Error_Pragma_Arg
8571
                 ("pragma% requires a local enumeration type", Arg1);
8572
            end if;
8573
 
8574
            Set_Discard_Names (Entity (Arg), False);
8575
         end Keep_Names;
8576
 
8577
         -------------
8578
         -- License --
8579
         -------------
8580
 
8581
         --  pragma License (RESTRICTED | UNRESTRICTED | GPL | MODIFIED_GPL);
8582
 
8583
         when Pragma_License =>
8584
            GNAT_Pragma;
8585
            Check_Arg_Count (1);
8586
            Check_No_Identifiers;
8587
            Check_Valid_Configuration_Pragma;
8588
            Check_Arg_Is_Identifier (Arg1);
8589
 
8590
            declare
8591
               Sind : constant Source_File_Index :=
8592
                        Source_Index (Current_Sem_Unit);
8593
 
8594
            begin
8595
               case Chars (Get_Pragma_Arg (Arg1)) is
8596
                  when Name_GPL =>
8597
                     Set_License (Sind, GPL);
8598
 
8599
                  when Name_Modified_GPL =>
8600
                     Set_License (Sind, Modified_GPL);
8601
 
8602
                  when Name_Restricted =>
8603
                     Set_License (Sind, Restricted);
8604
 
8605
                  when Name_Unrestricted =>
8606
                     Set_License (Sind, Unrestricted);
8607
 
8608
                  when others =>
8609
                     Error_Pragma_Arg ("invalid license name", Arg1);
8610
               end case;
8611
            end;
8612
 
8613
         ---------------
8614
         -- Link_With --
8615
         ---------------
8616
 
8617
         --  pragma Link_With (string_EXPRESSION {, string_EXPRESSION});
8618
 
8619
         when Pragma_Link_With => Link_With : declare
8620
            Arg : Node_Id;
8621
 
8622
         begin
8623
            GNAT_Pragma;
8624
 
8625
            if Operating_Mode = Generate_Code
8626
              and then In_Extended_Main_Source_Unit (N)
8627
            then
8628
               Check_At_Least_N_Arguments (1);
8629
               Check_No_Identifiers;
8630
               Check_Is_In_Decl_Part_Or_Package_Spec;
8631
               Check_Arg_Is_Static_Expression (Arg1, Standard_String);
8632
               Start_String;
8633
 
8634
               Arg := Arg1;
8635
               while Present (Arg) loop
8636
                  Check_Arg_Is_Static_Expression (Arg, Standard_String);
8637
 
8638
                  --  Store argument, converting sequences of spaces to a
8639
                  --  single null character (this is one of the differences
8640
                  --  in processing between Link_With and Linker_Options).
8641
 
8642
                  Arg_Store : declare
8643
                     C : constant Char_Code := Get_Char_Code (' ');
8644
                     S : constant String_Id :=
8645
                           Strval (Expr_Value_S (Expression (Arg)));
8646
                     L : constant Nat := String_Length (S);
8647
                     F : Nat := 1;
8648
 
8649
                     procedure Skip_Spaces;
8650
                     --  Advance F past any spaces
8651
 
8652
                     -----------------
8653
                     -- Skip_Spaces --
8654
                     -----------------
8655
 
8656
                     procedure Skip_Spaces is
8657
                     begin
8658
                        while F <= L and then Get_String_Char (S, F) = C loop
8659
                           F := F + 1;
8660
                        end loop;
8661
                     end Skip_Spaces;
8662
 
8663
                  --  Start of processing for Arg_Store
8664
 
8665
                  begin
8666
                     Skip_Spaces; -- skip leading spaces
8667
 
8668
                     --  Loop through characters, changing any embedded
8669
                     --  sequence of spaces to a single null character (this
8670
                     --  is how Link_With/Linker_Options differ)
8671
 
8672
                     while F <= L loop
8673
                        if Get_String_Char (S, F) = C then
8674
                           Skip_Spaces;
8675
                           exit when F > L;
8676
                           Store_String_Char (ASCII.NUL);
8677
 
8678
                        else
8679
                           Store_String_Char (Get_String_Char (S, F));
8680
                           F := F + 1;
8681
                        end if;
8682
                     end loop;
8683
                  end Arg_Store;
8684
 
8685
                  Arg := Next (Arg);
8686
 
8687
                  if Present (Arg) then
8688
                     Store_String_Char (ASCII.NUL);
8689
                  end if;
8690
               end loop;
8691
 
8692
               Store_Linker_Option_String (End_String);
8693
            end if;
8694
         end Link_With;
8695
 
8696
         ------------------
8697
         -- Linker_Alias --
8698
         ------------------
8699
 
8700
         --  pragma Linker_Alias (
8701
         --      [Entity =>]  LOCAL_NAME
8702
         --      [Target =>]  static_string_EXPRESSION);
8703
 
8704
         when Pragma_Linker_Alias =>
8705
            GNAT_Pragma;
8706
            Check_Arg_Order ((Name_Entity, Name_Target));
8707
            Check_Arg_Count (2);
8708
            Check_Optional_Identifier (Arg1, Name_Entity);
8709
            Check_Optional_Identifier (Arg2, Name_Target);
8710
            Check_Arg_Is_Library_Level_Local_Name (Arg1);
8711
            Check_Arg_Is_Static_Expression (Arg2, Standard_String);
8712
 
8713
            --  The only processing required is to link this item on to the
8714
            --  list of rep items for the given entity. This is accomplished
8715
            --  by the call to Rep_Item_Too_Late (when no error is detected
8716
            --  and False is returned).
8717
 
8718
            if Rep_Item_Too_Late (Entity (Expression (Arg1)), N) then
8719
               return;
8720
            else
8721
               Set_Has_Gigi_Rep_Item (Entity (Expression (Arg1)));
8722
            end if;
8723
 
8724
         ------------------------
8725
         -- Linker_Constructor --
8726
         ------------------------
8727
 
8728
         --  pragma Linker_Constructor (procedure_LOCAL_NAME);
8729
 
8730
         --  Code is shared with Linker_Destructor
8731
 
8732
         -----------------------
8733
         -- Linker_Destructor --
8734
         -----------------------
8735
 
8736
         --  pragma Linker_Destructor (procedure_LOCAL_NAME);
8737
 
8738
         when Pragma_Linker_Constructor |
8739
              Pragma_Linker_Destructor =>
8740
         Linker_Constructor : declare
8741
            Arg1_X : Node_Id;
8742
            Proc   : Entity_Id;
8743
 
8744
         begin
8745
            GNAT_Pragma;
8746
            Check_Arg_Count (1);
8747
            Check_No_Identifiers;
8748
            Check_Arg_Is_Local_Name (Arg1);
8749
            Arg1_X := Expression (Arg1);
8750
            Analyze (Arg1_X);
8751
            Proc := Find_Unique_Parameterless_Procedure (Arg1_X, Arg1);
8752
 
8753
            if not Is_Library_Level_Entity (Proc) then
8754
               Error_Pragma_Arg
8755
                ("argument for pragma% must be library level entity", Arg1);
8756
            end if;
8757
 
8758
            --  The only processing required is to link this item on to the
8759
            --  list of rep items for the given entity. This is accomplished
8760
            --  by the call to Rep_Item_Too_Late (when no error is detected
8761
            --  and False is returned).
8762
 
8763
            if Rep_Item_Too_Late (Proc, N) then
8764
               return;
8765
            else
8766
               Set_Has_Gigi_Rep_Item (Proc);
8767
            end if;
8768
         end Linker_Constructor;
8769
 
8770
         --------------------
8771
         -- Linker_Options --
8772
         --------------------
8773
 
8774
         --  pragma Linker_Options (string_EXPRESSION {, string_EXPRESSION});
8775
 
8776
         when Pragma_Linker_Options => Linker_Options : declare
8777
            Arg : Node_Id;
8778
 
8779
         begin
8780
            Check_Ada_83_Warning;
8781
            Check_No_Identifiers;
8782
            Check_Arg_Count (1);
8783
            Check_Is_In_Decl_Part_Or_Package_Spec;
8784
            Check_Arg_Is_Static_Expression (Arg1, Standard_String);
8785
            Start_String (Strval (Expr_Value_S (Expression (Arg1))));
8786
 
8787
            Arg := Arg2;
8788
            while Present (Arg) loop
8789
               Check_Arg_Is_Static_Expression (Arg, Standard_String);
8790
               Store_String_Char (ASCII.NUL);
8791
               Store_String_Chars (Strval (Expr_Value_S (Expression (Arg))));
8792
               Arg := Next (Arg);
8793
            end loop;
8794
 
8795
            if Operating_Mode = Generate_Code
8796
              and then In_Extended_Main_Source_Unit (N)
8797
            then
8798
               Store_Linker_Option_String (End_String);
8799
            end if;
8800
         end Linker_Options;
8801
 
8802
         --------------------
8803
         -- Linker_Section --
8804
         --------------------
8805
 
8806
         --  pragma Linker_Section (
8807
         --      [Entity  =>]  LOCAL_NAME
8808
         --      [Section =>]  static_string_EXPRESSION);
8809
 
8810
         when Pragma_Linker_Section =>
8811
            GNAT_Pragma;
8812
            Check_Arg_Order ((Name_Entity, Name_Section));
8813
            Check_Arg_Count (2);
8814
            Check_Optional_Identifier (Arg1, Name_Entity);
8815
            Check_Optional_Identifier (Arg2, Name_Section);
8816
            Check_Arg_Is_Library_Level_Local_Name (Arg1);
8817
            Check_Arg_Is_Static_Expression (Arg2, Standard_String);
8818
 
8819
            --  This pragma applies only to objects
8820
 
8821
            if not Is_Object (Entity (Expression (Arg1))) then
8822
               Error_Pragma_Arg ("pragma% applies only to objects", Arg1);
8823
            end if;
8824
 
8825
            --  The only processing required is to link this item on to the
8826
            --  list of rep items for the given entity. This is accomplished
8827
            --  by the call to Rep_Item_Too_Late (when no error is detected
8828
            --  and False is returned).
8829
 
8830
            if Rep_Item_Too_Late (Entity (Expression (Arg1)), N) then
8831
               return;
8832
            else
8833
               Set_Has_Gigi_Rep_Item (Entity (Expression (Arg1)));
8834
            end if;
8835
 
8836
         ----------
8837
         -- List --
8838
         ----------
8839
 
8840
         --  pragma List (On | Off)
8841
 
8842
         --  There is nothing to do here, since we did all the processing for
8843
         --  this pragma in Par.Prag (so that it works properly even in syntax
8844
         --  only mode).
8845
 
8846
         when Pragma_List =>
8847
            null;
8848
 
8849
         --------------------
8850
         -- Locking_Policy --
8851
         --------------------
8852
 
8853
         --  pragma Locking_Policy (policy_IDENTIFIER);
8854
 
8855
         when Pragma_Locking_Policy => declare
8856
            LP : Character;
8857
 
8858
         begin
8859
            Check_Ada_83_Warning;
8860
            Check_Arg_Count (1);
8861
            Check_No_Identifiers;
8862
            Check_Arg_Is_Locking_Policy (Arg1);
8863
            Check_Valid_Configuration_Pragma;
8864
            Get_Name_String (Chars (Expression (Arg1)));
8865
            LP := Fold_Upper (Name_Buffer (1));
8866
 
8867
            if Locking_Policy /= ' '
8868
              and then Locking_Policy /= LP
8869
            then
8870
               Error_Msg_Sloc := Locking_Policy_Sloc;
8871
               Error_Pragma ("locking policy incompatible with policy#");
8872
 
8873
            --  Set new policy, but always preserve System_Location since we
8874
            --  like the error message with the run time name.
8875
 
8876
            else
8877
               Locking_Policy := LP;
8878
 
8879
               if Locking_Policy_Sloc /= System_Location then
8880
                  Locking_Policy_Sloc := Loc;
8881
               end if;
8882
            end if;
8883
         end;
8884
 
8885
         ----------------
8886
         -- Long_Float --
8887
         ----------------
8888
 
8889
         --  pragma Long_Float (D_Float | G_Float);
8890
 
8891
         when Pragma_Long_Float =>
8892
            GNAT_Pragma;
8893
            Check_Valid_Configuration_Pragma;
8894
            Check_Arg_Count (1);
8895
            Check_No_Identifier (Arg1);
8896
            Check_Arg_Is_One_Of (Arg1, Name_D_Float, Name_G_Float);
8897
 
8898
            if not OpenVMS_On_Target then
8899
               Error_Pragma ("?pragma% ignored (applies only to Open'V'M'S)");
8900
            end if;
8901
 
8902
            --  D_Float case
8903
 
8904
            if Chars (Expression (Arg1)) = Name_D_Float then
8905
               if Opt.Float_Format_Long = 'G' then
8906
                  Error_Pragma ("G_Float previously specified");
8907
               end if;
8908
 
8909
               Opt.Float_Format_Long := 'D';
8910
 
8911
            --  G_Float case (this is the default, does not need overriding)
8912
 
8913
            else
8914
               if Opt.Float_Format_Long = 'D' then
8915
                  Error_Pragma ("D_Float previously specified");
8916
               end if;
8917
 
8918
               Opt.Float_Format_Long := 'G';
8919
            end if;
8920
 
8921
            Set_Standard_Fpt_Formats;
8922
 
8923
         -----------------------
8924
         -- Machine_Attribute --
8925
         -----------------------
8926
 
8927
         --  pragma Machine_Attribute (
8928
         --       [Entity         =>] LOCAL_NAME,
8929
         --       [Attribute_Name =>] static_string_EXPRESSION
8930
         --    [, [Info           =>] static_EXPRESSION] );
8931
 
8932
         when Pragma_Machine_Attribute => Machine_Attribute : declare
8933
            Def_Id : Entity_Id;
8934
 
8935
         begin
8936
            GNAT_Pragma;
8937
            Check_Arg_Order ((Name_Entity, Name_Attribute_Name, Name_Info));
8938
 
8939
            if Arg_Count = 3 then
8940
               Check_Optional_Identifier (Arg3, Name_Info);
8941
               Check_Arg_Is_Static_Expression (Arg3);
8942
            else
8943
               Check_Arg_Count (2);
8944
            end if;
8945
 
8946
            Check_Optional_Identifier (Arg1, Name_Entity);
8947
            Check_Optional_Identifier (Arg2, Name_Attribute_Name);
8948
            Check_Arg_Is_Local_Name (Arg1);
8949
            Check_Arg_Is_Static_Expression (Arg2, Standard_String);
8950
            Def_Id := Entity (Expression (Arg1));
8951
 
8952
            if Is_Access_Type (Def_Id) then
8953
               Def_Id := Designated_Type (Def_Id);
8954
            end if;
8955
 
8956
            if Rep_Item_Too_Early (Def_Id, N) then
8957
               return;
8958
            end if;
8959
 
8960
            Def_Id := Underlying_Type (Def_Id);
8961
 
8962
            --  The only processing required is to link this item on to the
8963
            --  list of rep items for the given entity. This is accomplished
8964
            --  by the call to Rep_Item_Too_Late (when no error is detected
8965
            --  and False is returned).
8966
 
8967
            if Rep_Item_Too_Late (Def_Id, N) then
8968
               return;
8969
            else
8970
               Set_Has_Gigi_Rep_Item (Entity (Expression (Arg1)));
8971
            end if;
8972
         end Machine_Attribute;
8973
 
8974
         ----------
8975
         -- Main --
8976
         ----------
8977
 
8978
         --  pragma Main
8979
         --   (MAIN_OPTION [, MAIN_OPTION]);
8980
 
8981
         --  MAIN_OPTION ::=
8982
         --    [STACK_SIZE              =>] static_integer_EXPRESSION
8983
         --  | [TASK_STACK_SIZE_DEFAULT =>] static_integer_EXPRESSION
8984
         --  | [TIME_SLICING_ENABLED    =>] static_boolean_EXPRESSION
8985
 
8986
         when Pragma_Main => Main : declare
8987
            Args  : Args_List (1 .. 3);
8988
            Names : constant Name_List (1 .. 3) := (
8989
                      Name_Stack_Size,
8990
                      Name_Task_Stack_Size_Default,
8991
                      Name_Time_Slicing_Enabled);
8992
 
8993
            Nod : Node_Id;
8994
 
8995
         begin
8996
            GNAT_Pragma;
8997
            Gather_Associations (Names, Args);
8998
 
8999
            for J in 1 .. 2 loop
9000
               if Present (Args (J)) then
9001
                  Check_Arg_Is_Static_Expression (Args (J), Any_Integer);
9002
               end if;
9003
            end loop;
9004
 
9005
            if Present (Args (3)) then
9006
               Check_Arg_Is_Static_Expression (Args (3), Standard_Boolean);
9007
            end if;
9008
 
9009
            Nod := Next (N);
9010
            while Present (Nod) loop
9011
               if Nkind (Nod) = N_Pragma
9012
                 and then Pragma_Name (Nod) = Name_Main
9013
               then
9014
                  Error_Msg_Name_1 := Pname;
9015
                  Error_Msg_N ("duplicate pragma% not permitted", Nod);
9016
               end if;
9017
 
9018
               Next (Nod);
9019
            end loop;
9020
         end Main;
9021
 
9022
         ------------------
9023
         -- Main_Storage --
9024
         ------------------
9025
 
9026
         --  pragma Main_Storage
9027
         --   (MAIN_STORAGE_OPTION [, MAIN_STORAGE_OPTION]);
9028
 
9029
         --  MAIN_STORAGE_OPTION ::=
9030
         --    [WORKING_STORAGE =>] static_SIMPLE_EXPRESSION
9031
         --  | [TOP_GUARD =>] static_SIMPLE_EXPRESSION
9032
 
9033
         when Pragma_Main_Storage => Main_Storage : declare
9034
            Args  : Args_List (1 .. 2);
9035
            Names : constant Name_List (1 .. 2) := (
9036
                      Name_Working_Storage,
9037
                      Name_Top_Guard);
9038
 
9039
            Nod : Node_Id;
9040
 
9041
         begin
9042
            GNAT_Pragma;
9043
            Gather_Associations (Names, Args);
9044
 
9045
            for J in 1 .. 2 loop
9046
               if Present (Args (J)) then
9047
                  Check_Arg_Is_Static_Expression (Args (J), Any_Integer);
9048
               end if;
9049
            end loop;
9050
 
9051
            Check_In_Main_Program;
9052
 
9053
            Nod := Next (N);
9054
            while Present (Nod) loop
9055
               if Nkind (Nod) = N_Pragma
9056
                 and then Pragma_Name (Nod) = Name_Main_Storage
9057
               then
9058
                  Error_Msg_Name_1 := Pname;
9059
                  Error_Msg_N ("duplicate pragma% not permitted", Nod);
9060
               end if;
9061
 
9062
               Next (Nod);
9063
            end loop;
9064
         end Main_Storage;
9065
 
9066
         -----------------
9067
         -- Memory_Size --
9068
         -----------------
9069
 
9070
         --  pragma Memory_Size (NUMERIC_LITERAL)
9071
 
9072
         when Pragma_Memory_Size =>
9073
            GNAT_Pragma;
9074
 
9075
            --  Memory size is simply ignored
9076
 
9077
            Check_No_Identifiers;
9078
            Check_Arg_Count (1);
9079
            Check_Arg_Is_Integer_Literal (Arg1);
9080
 
9081
         -------------
9082
         -- No_Body --
9083
         -------------
9084
 
9085
         --  pragma No_Body;
9086
 
9087
         --  The only correct use of this pragma is on its own in a file, in
9088
         --  which case it is specially processed (see Gnat1drv.Check_Bad_Body
9089
         --  and Frontend, which use Sinput.L.Source_File_Is_Pragma_No_Body to
9090
         --  check for a file containing nothing but a No_Body pragma). If we
9091
         --  attempt to process it during normal semantics processing, it means
9092
         --  it was misplaced.
9093
 
9094
         when Pragma_No_Body =>
9095
            GNAT_Pragma;
9096
            Pragma_Misplaced;
9097
 
9098
         ---------------
9099
         -- No_Return --
9100
         ---------------
9101
 
9102
         --  pragma No_Return (procedure_LOCAL_NAME {, procedure_Local_Name});
9103
 
9104
         when Pragma_No_Return => No_Return : declare
9105
            Id    : Node_Id;
9106
            E     : Entity_Id;
9107
            Found : Boolean;
9108
            Arg   : Node_Id;
9109
 
9110
         begin
9111
            Ada_2005_Pragma;
9112
            Check_At_Least_N_Arguments (1);
9113
 
9114
            --  Loop through arguments of pragma
9115
 
9116
            Arg := Arg1;
9117
            while Present (Arg) loop
9118
               Check_Arg_Is_Local_Name (Arg);
9119
               Id := Expression (Arg);
9120
               Analyze (Id);
9121
 
9122
               if not Is_Entity_Name (Id) then
9123
                  Error_Pragma_Arg ("entity name required", Arg);
9124
               end if;
9125
 
9126
               if Etype (Id) = Any_Type then
9127
                  raise Pragma_Exit;
9128
               end if;
9129
 
9130
               --  Loop to find matching procedures
9131
 
9132
               E := Entity (Id);
9133
               Found := False;
9134
               while Present (E)
9135
                 and then Scope (E) = Current_Scope
9136
               loop
9137
                  if Ekind (E) = E_Procedure
9138
                    or else Ekind (E) = E_Generic_Procedure
9139
                  then
9140
                     Set_No_Return (E);
9141
 
9142
                     --  Set flag on any alias as well
9143
 
9144
                     if Is_Overloadable (E) and then Present (Alias (E)) then
9145
                        Set_No_Return (Alias (E));
9146
                     end if;
9147
 
9148
                     Found := True;
9149
                  end if;
9150
 
9151
                  E := Homonym (E);
9152
               end loop;
9153
 
9154
               if not Found then
9155
                  Error_Pragma_Arg ("no procedure & found for pragma%", Arg);
9156
               end if;
9157
 
9158
               Next (Arg);
9159
            end loop;
9160
         end No_Return;
9161
 
9162
         -----------------
9163
         -- No_Run_Time --
9164
         -----------------
9165
 
9166
         --  pragma No_Run_Time;
9167
 
9168
         --  Note: this pragma is retained for backwards compatibility. See
9169
         --  body of Rtsfind for full details on its handling.
9170
 
9171
         when Pragma_No_Run_Time =>
9172
            GNAT_Pragma;
9173
            Check_Valid_Configuration_Pragma;
9174
            Check_Arg_Count (0);
9175
 
9176
            No_Run_Time_Mode           := True;
9177
            Configurable_Run_Time_Mode := True;
9178
 
9179
            --  Set Duration to 32 bits if word size is 32
9180
 
9181
            if Ttypes.System_Word_Size = 32 then
9182
               Duration_32_Bits_On_Target := True;
9183
            end if;
9184
 
9185
            --  Set appropriate restrictions
9186
 
9187
            Set_Restriction (No_Finalization, N);
9188
            Set_Restriction (No_Exception_Handlers, N);
9189
            Set_Restriction (Max_Tasks, N, 0);
9190
            Set_Restriction (No_Tasking, N);
9191
 
9192
         ------------------------
9193
         -- No_Strict_Aliasing --
9194
         ------------------------
9195
 
9196
         --  pragma No_Strict_Aliasing [([Entity =>] type_LOCAL_NAME)];
9197
 
9198
         when Pragma_No_Strict_Aliasing => No_Strict_Aliasing : declare
9199
            E_Id : Entity_Id;
9200
 
9201
         begin
9202
            GNAT_Pragma;
9203
            Check_At_Most_N_Arguments (1);
9204
 
9205
            if Arg_Count = 0 then
9206
               Check_Valid_Configuration_Pragma;
9207
               Opt.No_Strict_Aliasing := True;
9208
 
9209
            else
9210
               Check_Optional_Identifier (Arg2, Name_Entity);
9211
               Check_Arg_Is_Local_Name (Arg1);
9212
               E_Id := Entity (Expression (Arg1));
9213
 
9214
               if E_Id = Any_Type then
9215
                  return;
9216
               elsif No (E_Id) or else not Is_Access_Type (E_Id) then
9217
                  Error_Pragma_Arg ("pragma% requires access type", Arg1);
9218
               end if;
9219
 
9220
               Set_No_Strict_Aliasing (Implementation_Base_Type (E_Id));
9221
            end if;
9222
         end No_Strict_Aliasing;
9223
 
9224
         -----------------------
9225
         -- Normalize_Scalars --
9226
         -----------------------
9227
 
9228
         --  pragma Normalize_Scalars;
9229
 
9230
         when Pragma_Normalize_Scalars =>
9231
            Check_Ada_83_Warning;
9232
            Check_Arg_Count (0);
9233
            Check_Valid_Configuration_Pragma;
9234
 
9235
            --  Normalize_Scalars creates false positives in CodePeer, so
9236
            --  ignore this pragma in this mode.
9237
 
9238
            if not CodePeer_Mode then
9239
               Normalize_Scalars := True;
9240
               Init_Or_Norm_Scalars := True;
9241
            end if;
9242
 
9243
         -----------------
9244
         -- Obsolescent --
9245
         -----------------
9246
 
9247
         --  pragma Obsolescent;
9248
 
9249
         --  pragma Obsolescent (
9250
         --    [Message =>] static_string_EXPRESSION
9251
         --  [,[Version =>] Ada_05]]);
9252
 
9253
         --  pragma Obsolescent (
9254
         --    [Entity  =>] NAME
9255
         --  [,[Message =>] static_string_EXPRESSION
9256
         --  [,[Version =>] Ada_05]] );
9257
 
9258
         when Pragma_Obsolescent => Obsolescent : declare
9259
            Ename : Node_Id;
9260
            Decl  : Node_Id;
9261
 
9262
            procedure Set_Obsolescent (E : Entity_Id);
9263
            --  Given an entity Ent, mark it as obsolescent if appropriate
9264
 
9265
            ---------------------
9266
            -- Set_Obsolescent --
9267
            ---------------------
9268
 
9269
            procedure Set_Obsolescent (E : Entity_Id) is
9270
               Active : Boolean;
9271
               Ent    : Entity_Id;
9272
               S      : String_Id;
9273
 
9274
            begin
9275
               Active := True;
9276
               Ent    := E;
9277
 
9278
               --  Entity name was given
9279
 
9280
               if Present (Ename) then
9281
 
9282
                  --  If entity name matches, we are fine. Save entity in
9283
                  --  pragma argument, for ASIS use.
9284
 
9285
                  if Chars (Ename) = Chars (Ent) then
9286
                     Set_Entity (Ename, Ent);
9287
                     Generate_Reference (Ent, Ename);
9288
 
9289
                  --  If entity name does not match, only possibility is an
9290
                  --  enumeration literal from an enumeration type declaration.
9291
 
9292
                  elsif Ekind (Ent) /= E_Enumeration_Type then
9293
                     Error_Pragma
9294
                       ("pragma % entity name does not match declaration");
9295
 
9296
                  else
9297
                     Ent := First_Literal (E);
9298
                     loop
9299
                        if No (Ent) then
9300
                           Error_Pragma
9301
                             ("pragma % entity name does not match any " &
9302
                              "enumeration literal");
9303
 
9304
                        elsif Chars (Ent) = Chars (Ename) then
9305
                           Set_Entity (Ename, Ent);
9306
                           Generate_Reference (Ent, Ename);
9307
                           exit;
9308
 
9309
                        else
9310
                           Ent := Next_Literal (Ent);
9311
                        end if;
9312
                     end loop;
9313
                  end if;
9314
               end if;
9315
 
9316
               --  Ent points to entity to be marked
9317
 
9318
               if Arg_Count >= 1 then
9319
 
9320
                  --  Deal with static string argument
9321
 
9322
                  Check_Arg_Is_Static_Expression (Arg1, Standard_String);
9323
                  S := Strval (Expression (Arg1));
9324
 
9325
                  for J in 1 .. String_Length (S) loop
9326
                     if not In_Character_Range (Get_String_Char (S, J)) then
9327
                        Error_Pragma_Arg
9328
                          ("pragma% argument does not allow wide characters",
9329
                           Arg1);
9330
                     end if;
9331
                  end loop;
9332
 
9333
                  Obsolescent_Warnings.Append
9334
                    ((Ent => Ent, Msg => Strval (Expression (Arg1))));
9335
 
9336
                  --  Check for Ada_05 parameter
9337
 
9338
                  if Arg_Count /= 1 then
9339
                     Check_Arg_Count (2);
9340
 
9341
                     declare
9342
                        Argx : constant Node_Id := Get_Pragma_Arg (Arg2);
9343
 
9344
                     begin
9345
                        Check_Arg_Is_Identifier (Argx);
9346
 
9347
                        if Chars (Argx) /= Name_Ada_05 then
9348
                           Error_Msg_Name_2 := Name_Ada_05;
9349
                           Error_Pragma_Arg
9350
                             ("only allowed argument for pragma% is %", Argx);
9351
                        end if;
9352
 
9353
                        if Ada_Version_Explicit < Ada_05
9354
                          or else not Warn_On_Ada_2005_Compatibility
9355
                        then
9356
                           Active := False;
9357
                        end if;
9358
                     end;
9359
                  end if;
9360
               end if;
9361
 
9362
               --  Set flag if pragma active
9363
 
9364
               if Active then
9365
                  Set_Is_Obsolescent (Ent);
9366
               end if;
9367
 
9368
               return;
9369
            end Set_Obsolescent;
9370
 
9371
         --  Start of processing for pragma Obsolescent
9372
 
9373
         begin
9374
            GNAT_Pragma;
9375
 
9376
            Check_At_Most_N_Arguments (3);
9377
 
9378
            --  See if first argument specifies an entity name
9379
 
9380
            if Arg_Count >= 1
9381
              and then
9382
                (Chars (Arg1) = Name_Entity
9383
                   or else
9384
                     Nkind_In (Get_Pragma_Arg (Arg1), N_Character_Literal,
9385
                                                      N_Identifier,
9386
                                                      N_Operator_Symbol))
9387
            then
9388
               Ename := Get_Pragma_Arg (Arg1);
9389
 
9390
               --  Eliminate first argument, so we can share processing
9391
 
9392
               Arg1 := Arg2;
9393
               Arg2 := Arg3;
9394
               Arg_Count := Arg_Count - 1;
9395
 
9396
            --  No Entity name argument given
9397
 
9398
            else
9399
               Ename := Empty;
9400
            end if;
9401
 
9402
            if Arg_Count >= 1 then
9403
               Check_Optional_Identifier (Arg1, Name_Message);
9404
 
9405
               if Arg_Count = 2 then
9406
                  Check_Optional_Identifier (Arg2, Name_Version);
9407
               end if;
9408
            end if;
9409
 
9410
            --  Get immediately preceding declaration
9411
 
9412
            Decl := Prev (N);
9413
            while Present (Decl) and then Nkind (Decl) = N_Pragma loop
9414
               Prev (Decl);
9415
            end loop;
9416
 
9417
            --  Cases where we do not follow anything other than another pragma
9418
 
9419
            if No (Decl) then
9420
 
9421
               --  First case: library level compilation unit declaration with
9422
               --  the pragma immediately following the declaration.
9423
 
9424
               if Nkind (Parent (N)) = N_Compilation_Unit_Aux then
9425
                  Set_Obsolescent
9426
                    (Defining_Entity (Unit (Parent (Parent (N)))));
9427
                  return;
9428
 
9429
               --  Case 2: library unit placement for package
9430
 
9431
               else
9432
                  declare
9433
                     Ent : constant Entity_Id := Find_Lib_Unit_Name;
9434
                  begin
9435
                     if Is_Package_Or_Generic_Package (Ent) then
9436
                        Set_Obsolescent (Ent);
9437
                        return;
9438
                     end if;
9439
                  end;
9440
               end if;
9441
 
9442
            --  Cases where we must follow a declaration
9443
 
9444
            else
9445
               if         Nkind (Decl) not in N_Declaration
9446
                 and then Nkind (Decl) not in N_Later_Decl_Item
9447
                 and then Nkind (Decl) not in N_Generic_Declaration
9448
                 and then Nkind (Decl) not in N_Renaming_Declaration
9449
               then
9450
                  Error_Pragma
9451
                    ("pragma% misplaced, "
9452
                     & "must immediately follow a declaration");
9453
 
9454
               else
9455
                  Set_Obsolescent (Defining_Entity (Decl));
9456
                  return;
9457
               end if;
9458
            end if;
9459
         end Obsolescent;
9460
 
9461
         --------------
9462
         -- Optimize --
9463
         --------------
9464
 
9465
         --  pragma Optimize (Time | Space | Off);
9466
 
9467
         --  The actual check for optimize is done in Gigi. Note that this
9468
         --  pragma does not actually change the optimization setting, it
9469
         --  simply checks that it is consistent with the pragma.
9470
 
9471
         when Pragma_Optimize =>
9472
            Check_No_Identifiers;
9473
            Check_Arg_Count (1);
9474
            Check_Arg_Is_One_Of (Arg1, Name_Time, Name_Space, Name_Off);
9475
 
9476
         ------------------------
9477
         -- Optimize_Alignment --
9478
         ------------------------
9479
 
9480
         --  pragma Optimize_Alignment (Time | Space | Off);
9481
 
9482
         when Pragma_Optimize_Alignment =>
9483
            GNAT_Pragma;
9484
            Check_No_Identifiers;
9485
            Check_Arg_Count (1);
9486
            Check_Valid_Configuration_Pragma;
9487
 
9488
            declare
9489
               Nam : constant Name_Id := Chars (Get_Pragma_Arg (Arg1));
9490
            begin
9491
               case Nam is
9492
                  when Name_Time =>
9493
                     Opt.Optimize_Alignment := 'T';
9494
                  when Name_Space =>
9495
                     Opt.Optimize_Alignment := 'S';
9496
                  when Name_Off =>
9497
                     Opt.Optimize_Alignment := 'O';
9498
                  when others =>
9499
                     Error_Pragma_Arg ("invalid argument for pragma%", Arg1);
9500
               end case;
9501
            end;
9502
 
9503
            --  Set indication that mode is set locally. If we are in fact in a
9504
            --  configuration pragma file, this setting is harmless since the
9505
            --  switch will get reset anyway at the start of each unit.
9506
 
9507
            Optimize_Alignment_Local := True;
9508
 
9509
         ----------
9510
         -- Pack --
9511
         ----------
9512
 
9513
         --  pragma Pack (first_subtype_LOCAL_NAME);
9514
 
9515
         when Pragma_Pack => Pack : declare
9516
            Assoc   : constant Node_Id := Arg1;
9517
            Type_Id : Node_Id;
9518
            Typ     : Entity_Id;
9519
 
9520
         begin
9521
            Check_No_Identifiers;
9522
            Check_Arg_Count (1);
9523
            Check_Arg_Is_Local_Name (Arg1);
9524
 
9525
            Type_Id := Expression (Assoc);
9526
            Find_Type (Type_Id);
9527
            Typ := Entity (Type_Id);
9528
 
9529
            if Typ = Any_Type
9530
              or else Rep_Item_Too_Early (Typ, N)
9531
            then
9532
               return;
9533
            else
9534
               Typ := Underlying_Type (Typ);
9535
            end if;
9536
 
9537
            if not Is_Array_Type (Typ) and then not Is_Record_Type (Typ) then
9538
               Error_Pragma ("pragma% must specify array or record type");
9539
            end if;
9540
 
9541
            Check_First_Subtype (Arg1);
9542
 
9543
            if Has_Pragma_Pack (Typ) then
9544
               Error_Pragma ("duplicate pragma%, only one allowed");
9545
 
9546
            --  Array type
9547
 
9548
            elsif Is_Array_Type (Typ) then
9549
 
9550
               --  Pack not allowed for aliased or atomic components
9551
 
9552
               if Has_Aliased_Components (Base_Type (Typ)) then
9553
                  Error_Pragma
9554
                    ("pragma% ignored, cannot pack aliased components?");
9555
 
9556
               elsif Has_Atomic_Components (Typ)
9557
                 or else Is_Atomic (Component_Type (Typ))
9558
               then
9559
                  Error_Pragma
9560
                    ("?pragma% ignored, cannot pack atomic components");
9561
               end if;
9562
 
9563
               --  If we had an explicit component size given, then we do not
9564
               --  let Pack override this given size. We also give a warning
9565
               --  that Pack is being ignored unless we can tell for sure that
9566
               --  the Pack would not have had any effect anyway.
9567
 
9568
               if Has_Component_Size_Clause (Typ) then
9569
                  if Known_Static_RM_Size (Component_Type (Typ))
9570
                    and then
9571
                      RM_Size (Component_Type (Typ)) = Component_Size (Typ)
9572
                  then
9573
                     null;
9574
                  else
9575
                     Error_Pragma
9576
                       ("?pragma% ignored, explicit component size given");
9577
                  end if;
9578
 
9579
               --  If no prior array component size given, Pack is effective
9580
 
9581
               else
9582
                  if not Rep_Item_Too_Late (Typ, N) then
9583
 
9584
                     --  In the context of static code analysis, we do not need
9585
                     --  complex front-end expansions related to pragma Pack,
9586
                     --  so disable handling of pragma Pack in this case.
9587
 
9588
                     if CodePeer_Mode then
9589
                        null;
9590
 
9591
                     --  For normal non-VM target, do the packing
9592
 
9593
                     elsif VM_Target = No_VM then
9594
                        Set_Is_Packed            (Base_Type (Typ));
9595
                        Set_Has_Pragma_Pack      (Base_Type (Typ));
9596
                           Set_Has_Non_Standard_Rep (Base_Type (Typ));
9597
 
9598
                     --  If we ignore the pack, then warn about this, except
9599
                     --  that we suppress the warning in GNAT mode.
9600
 
9601
                     elsif not GNAT_Mode then
9602
                        Error_Pragma
9603
                          ("?pragma% ignored in this configuration");
9604
                     end if;
9605
                  end if;
9606
               end if;
9607
 
9608
            --  For record types, the pack is always effective
9609
 
9610
            else pragma Assert (Is_Record_Type (Typ));
9611
               if not Rep_Item_Too_Late (Typ, N) then
9612
                  if VM_Target = No_VM then
9613
                     Set_Is_Packed            (Base_Type (Typ));
9614
                     Set_Has_Pragma_Pack      (Base_Type (Typ));
9615
                     Set_Has_Non_Standard_Rep (Base_Type (Typ));
9616
 
9617
                  elsif not GNAT_Mode then
9618
                     Error_Pragma ("?pragma% ignored in this configuration");
9619
                  end if;
9620
               end if;
9621
            end if;
9622
         end Pack;
9623
 
9624
         ----------
9625
         -- Page --
9626
         ----------
9627
 
9628
         --  pragma Page;
9629
 
9630
         --  There is nothing to do here, since we did all the processing for
9631
         --  this pragma in Par.Prag (so that it works properly even in syntax
9632
         --  only mode).
9633
 
9634
         when Pragma_Page =>
9635
            null;
9636
 
9637
         -------------
9638
         -- Passive --
9639
         -------------
9640
 
9641
         --  pragma Passive [(PASSIVE_FORM)];
9642
 
9643
         --   PASSIVE_FORM ::= Semaphore | No
9644
 
9645
         when Pragma_Passive =>
9646
            GNAT_Pragma;
9647
 
9648
            if Nkind (Parent (N)) /= N_Task_Definition then
9649
               Error_Pragma ("pragma% must be within task definition");
9650
            end if;
9651
 
9652
            if Arg_Count /= 0 then
9653
               Check_Arg_Count (1);
9654
               Check_Arg_Is_One_Of (Arg1, Name_Semaphore, Name_No);
9655
            end if;
9656
 
9657
         ----------------------------------
9658
         -- Preelaborable_Initialization --
9659
         ----------------------------------
9660
 
9661
         --  pragma Preelaborable_Initialization (DIRECT_NAME);
9662
 
9663
         when Pragma_Preelaborable_Initialization => Preelab_Init : declare
9664
            Ent : Entity_Id;
9665
 
9666
         begin
9667
            Ada_2005_Pragma;
9668
            Check_Arg_Count (1);
9669
            Check_No_Identifiers;
9670
            Check_Arg_Is_Identifier (Arg1);
9671
            Check_Arg_Is_Local_Name (Arg1);
9672
            Check_First_Subtype (Arg1);
9673
            Ent := Entity (Expression (Arg1));
9674
 
9675
            if not Is_Private_Type (Ent)
9676
              and then not Is_Protected_Type (Ent)
9677
            then
9678
               Error_Pragma_Arg
9679
                 ("pragma % can only be applied to private or protected type",
9680
                  Arg1);
9681
            end if;
9682
 
9683
            --  Give an error if the pragma is applied to a protected type that
9684
            --  does not qualify (due to having entries, or due to components
9685
            --  that do not qualify).
9686
 
9687
            if Is_Protected_Type (Ent)
9688
              and then not Has_Preelaborable_Initialization (Ent)
9689
            then
9690
               Error_Msg_N
9691
                 ("protected type & does not have preelaborable " &
9692
                  "initialization", Ent);
9693
 
9694
            --  Otherwise mark the type as definitely having preelaborable
9695
            --  initialization.
9696
 
9697
            else
9698
               Set_Known_To_Have_Preelab_Init (Ent);
9699
            end if;
9700
 
9701
            if Has_Pragma_Preelab_Init (Ent)
9702
              and then Warn_On_Redundant_Constructs
9703
            then
9704
               Error_Pragma ("?duplicate pragma%!");
9705
            else
9706
               Set_Has_Pragma_Preelab_Init (Ent);
9707
            end if;
9708
         end Preelab_Init;
9709
 
9710
         --------------------
9711
         -- Persistent_BSS --
9712
         --------------------
9713
 
9714
         when Pragma_Persistent_BSS => Persistent_BSS :  declare
9715
            Decl : Node_Id;
9716
            Ent  : Entity_Id;
9717
            Prag : Node_Id;
9718
 
9719
         begin
9720
            GNAT_Pragma;
9721
            Check_At_Most_N_Arguments (1);
9722
 
9723
            --  Case of application to specific object (one argument)
9724
 
9725
            if Arg_Count = 1 then
9726
               Check_Arg_Is_Library_Level_Local_Name (Arg1);
9727
 
9728
               if not Is_Entity_Name (Expression (Arg1))
9729
                 or else
9730
                  (Ekind (Entity (Expression (Arg1))) /= E_Variable
9731
                    and then Ekind (Entity (Expression (Arg1))) /= E_Constant)
9732
               then
9733
                  Error_Pragma_Arg ("pragma% only applies to objects", Arg1);
9734
               end if;
9735
 
9736
               Ent := Entity (Expression (Arg1));
9737
               Decl := Parent (Ent);
9738
 
9739
               if Rep_Item_Too_Late (Ent, N) then
9740
                  return;
9741
               end if;
9742
 
9743
               if Present (Expression (Decl)) then
9744
                  Error_Pragma_Arg
9745
                    ("object for pragma% cannot have initialization", Arg1);
9746
               end if;
9747
 
9748
               if not Is_Potentially_Persistent_Type (Etype (Ent)) then
9749
                  Error_Pragma_Arg
9750
                    ("object type for pragma% is not potentially persistent",
9751
                     Arg1);
9752
               end if;
9753
 
9754
               Prag :=
9755
                 Make_Linker_Section_Pragma
9756
                   (Ent, Sloc (N), ".persistent.bss");
9757
               Insert_After (N, Prag);
9758
               Analyze (Prag);
9759
 
9760
            --  Case of use as configuration pragma with no arguments
9761
 
9762
            else
9763
               Check_Valid_Configuration_Pragma;
9764
               Persistent_BSS_Mode := True;
9765
            end if;
9766
         end Persistent_BSS;
9767
 
9768
         -------------
9769
         -- Polling --
9770
         -------------
9771
 
9772
         --  pragma Polling (ON | OFF);
9773
 
9774
         when Pragma_Polling =>
9775
            GNAT_Pragma;
9776
            Check_Arg_Count (1);
9777
            Check_No_Identifiers;
9778
            Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
9779
            Polling_Required := (Chars (Expression (Arg1)) = Name_On);
9780
 
9781
         -------------------
9782
         -- Postcondition --
9783
         -------------------
9784
 
9785
         --  pragma Postcondition ([Check   =>] Boolean_Expression
9786
         --                      [,[Message =>] String_Expression]);
9787
 
9788
         when Pragma_Postcondition => Postcondition : declare
9789
            In_Body : Boolean;
9790
            pragma Warnings (Off, In_Body);
9791
 
9792
         begin
9793
            GNAT_Pragma;
9794
            Check_At_Least_N_Arguments (1);
9795
            Check_At_Most_N_Arguments (2);
9796
            Check_Optional_Identifier (Arg1, Name_Check);
9797
 
9798
            --  All we need to do here is call the common check procedure,
9799
            --  the remainder of the processing is found in Sem_Ch6/Sem_Ch7.
9800
 
9801
            Check_Precondition_Postcondition (In_Body);
9802
         end Postcondition;
9803
 
9804
         ------------------
9805
         -- Precondition --
9806
         ------------------
9807
 
9808
         --  pragma Precondition ([Check   =>] Boolean_Expression
9809
         --                     [,[Message =>] String_Expression]);
9810
 
9811
         when Pragma_Precondition => Precondition : declare
9812
            In_Body : Boolean;
9813
 
9814
         begin
9815
            GNAT_Pragma;
9816
            Check_At_Least_N_Arguments (1);
9817
            Check_At_Most_N_Arguments (2);
9818
            Check_Optional_Identifier (Arg1, Name_Check);
9819
 
9820
            Check_Precondition_Postcondition (In_Body);
9821
 
9822
            --  If in spec, nothing more to do. If in body, then we convert the
9823
            --  pragma to pragma Check (Precondition, cond [, msg]). Note we do
9824
            --  this whether or not precondition checks are enabled. That works
9825
            --  fine since pragma Check will do this check, and will also
9826
            --  analyze the condition itself in the proper context.
9827
 
9828
            if In_Body then
9829
               if Arg_Count = 2 then
9830
                  Check_Optional_Identifier (Arg3, Name_Message);
9831
                  Analyze_And_Resolve (Get_Pragma_Arg (Arg2), Standard_String);
9832
               end if;
9833
 
9834
               Rewrite (N,
9835
                 Make_Pragma (Loc,
9836
                   Chars => Name_Check,
9837
                   Pragma_Argument_Associations => New_List (
9838
                     Make_Pragma_Argument_Association (Loc,
9839
                       Expression =>
9840
                         Make_Identifier (Loc,
9841
                           Chars => Name_Precondition)),
9842
 
9843
                     Make_Pragma_Argument_Association (Sloc (Arg1),
9844
                       Expression => Relocate_Node (Get_Pragma_Arg (Arg1))))));
9845
 
9846
               if Arg_Count = 2 then
9847
                  Append_To (Pragma_Argument_Associations (N),
9848
                    Make_Pragma_Argument_Association (Sloc (Arg2),
9849
                      Expression => Relocate_Node (Get_Pragma_Arg (Arg2))));
9850
               end if;
9851
 
9852
               Analyze (N);
9853
            end if;
9854
         end Precondition;
9855
 
9856
         ------------------
9857
         -- Preelaborate --
9858
         ------------------
9859
 
9860
         --  pragma Preelaborate [(library_unit_NAME)];
9861
 
9862
         --  Set the flag Is_Preelaborated of program unit name entity
9863
 
9864
         when Pragma_Preelaborate => Preelaborate : declare
9865
            Pa  : constant Node_Id   := Parent (N);
9866
            Pk  : constant Node_Kind := Nkind (Pa);
9867
            Ent : Entity_Id;
9868
 
9869
         begin
9870
            Check_Ada_83_Warning;
9871
            Check_Valid_Library_Unit_Pragma;
9872
 
9873
            if Nkind (N) = N_Null_Statement then
9874
               return;
9875
            end if;
9876
 
9877
            Ent := Find_Lib_Unit_Name;
9878
 
9879
            --  This filters out pragmas inside generic parent then
9880
            --  show up inside instantiation
9881
 
9882
            if Present (Ent)
9883
              and then not (Pk = N_Package_Specification
9884
                              and then Present (Generic_Parent (Pa)))
9885
            then
9886
               if not Debug_Flag_U then
9887
                  Set_Is_Preelaborated (Ent);
9888
                  Set_Suppress_Elaboration_Warnings (Ent);
9889
               end if;
9890
            end if;
9891
         end Preelaborate;
9892
 
9893
         ---------------------
9894
         -- Preelaborate_05 --
9895
         ---------------------
9896
 
9897
         --  pragma Preelaborate_05 [(library_unit_NAME)];
9898
 
9899
         --  This pragma is useable only in GNAT_Mode, where it is used like
9900
         --  pragma Preelaborate but it is only effective in Ada 2005 mode
9901
         --  (otherwise it is ignored). This is used to implement AI-362 which
9902
         --  recategorizes some run-time packages in Ada 2005 mode.
9903
 
9904
         when Pragma_Preelaborate_05 => Preelaborate_05 : declare
9905
            Ent : Entity_Id;
9906
 
9907
         begin
9908
            GNAT_Pragma;
9909
            Check_Valid_Library_Unit_Pragma;
9910
 
9911
            if not GNAT_Mode then
9912
               Error_Pragma ("pragma% only available in GNAT mode");
9913
            end if;
9914
 
9915
            if Nkind (N) = N_Null_Statement then
9916
               return;
9917
            end if;
9918
 
9919
            --  This is one of the few cases where we need to test the value of
9920
            --  Ada_Version_Explicit rather than Ada_Version (which is always
9921
            --  set to Ada_05 in a predefined unit), we need to know the
9922
            --  explicit version set to know if this pragma is active.
9923
 
9924
            if Ada_Version_Explicit >= Ada_05 then
9925
               Ent := Find_Lib_Unit_Name;
9926
               Set_Is_Preelaborated (Ent);
9927
               Set_Suppress_Elaboration_Warnings (Ent);
9928
            end if;
9929
         end Preelaborate_05;
9930
 
9931
         --------------
9932
         -- Priority --
9933
         --------------
9934
 
9935
         --  pragma Priority (EXPRESSION);
9936
 
9937
         when Pragma_Priority => Priority : declare
9938
            P   : constant Node_Id := Parent (N);
9939
            Arg : Node_Id;
9940
 
9941
         begin
9942
            Check_No_Identifiers;
9943
            Check_Arg_Count (1);
9944
 
9945
            --  Subprogram case
9946
 
9947
            if Nkind (P) = N_Subprogram_Body then
9948
               Check_In_Main_Program;
9949
 
9950
               Arg := Expression (Arg1);
9951
               Analyze_And_Resolve (Arg, Standard_Integer);
9952
 
9953
               --  Must be static
9954
 
9955
               if not Is_Static_Expression (Arg) then
9956
                  Flag_Non_Static_Expr
9957
                    ("main subprogram priority is not static!", Arg);
9958
                  raise Pragma_Exit;
9959
 
9960
               --  If constraint error, then we already signalled an error
9961
 
9962
               elsif Raises_Constraint_Error (Arg) then
9963
                  null;
9964
 
9965
               --  Otherwise check in range
9966
 
9967
               else
9968
                  declare
9969
                     Val : constant Uint := Expr_Value (Arg);
9970
 
9971
                  begin
9972
                     if Val < 0
9973
                       or else Val > Expr_Value (Expression
9974
                                       (Parent (RTE (RE_Max_Priority))))
9975
                     then
9976
                        Error_Pragma_Arg
9977
                          ("main subprogram priority is out of range", Arg1);
9978
                     end if;
9979
                  end;
9980
               end if;
9981
 
9982
               Set_Main_Priority
9983
                    (Current_Sem_Unit, UI_To_Int (Expr_Value (Arg)));
9984
 
9985
               --  Load an arbitrary entity from System.Tasking to make sure
9986
               --  this package is implicitly with'ed, since we need to have
9987
               --  the tasking run-time active for the pragma Priority to have
9988
               --  any effect.
9989
 
9990
               declare
9991
                  Discard : Entity_Id;
9992
                  pragma Warnings (Off, Discard);
9993
               begin
9994
                  Discard := RTE (RE_Task_List);
9995
               end;
9996
 
9997
            --  Task or Protected, must be of type Integer
9998
 
9999
            elsif Nkind_In (P, N_Protected_Definition, N_Task_Definition) then
10000
               Arg := Expression (Arg1);
10001
 
10002
               --  The expression must be analyzed in the special manner
10003
               --  described in "Handling of Default and Per-Object
10004
               --  Expressions" in sem.ads.
10005
 
10006
               Preanalyze_Spec_Expression (Arg, Standard_Integer);
10007
 
10008
               if not Is_Static_Expression (Arg) then
10009
                  Check_Restriction (Static_Priorities, Arg);
10010
               end if;
10011
 
10012
            --  Anything else is incorrect
10013
 
10014
            else
10015
               Pragma_Misplaced;
10016
            end if;
10017
 
10018
            if Has_Priority_Pragma (P) then
10019
               Error_Pragma ("duplicate pragma% not allowed");
10020
            else
10021
               Set_Has_Priority_Pragma (P, True);
10022
 
10023
               if Nkind_In (P, N_Protected_Definition, N_Task_Definition) then
10024
                  Record_Rep_Item (Defining_Identifier (Parent (P)), N);
10025
                  --  exp_ch9 should use this ???
10026
               end if;
10027
            end if;
10028
         end Priority;
10029
 
10030
         -----------------------------------
10031
         -- Priority_Specific_Dispatching --
10032
         -----------------------------------
10033
 
10034
         --  pragma Priority_Specific_Dispatching (
10035
         --    policy_IDENTIFIER,
10036
         --    first_priority_EXPRESSION,
10037
         --    last_priority_EXPRESSION);
10038
 
10039
         when Pragma_Priority_Specific_Dispatching =>
10040
         Priority_Specific_Dispatching : declare
10041
            Prio_Id : constant Entity_Id := RTE (RE_Any_Priority);
10042
            --  This is the entity System.Any_Priority;
10043
 
10044
            DP          : Character;
10045
            Lower_Bound : Node_Id;
10046
            Upper_Bound : Node_Id;
10047
            Lower_Val   : Uint;
10048
            Upper_Val   : Uint;
10049
 
10050
         begin
10051
            Ada_2005_Pragma;
10052
            Check_Arg_Count (3);
10053
            Check_No_Identifiers;
10054
            Check_Arg_Is_Task_Dispatching_Policy (Arg1);
10055
            Check_Valid_Configuration_Pragma;
10056
            Get_Name_String (Chars (Expression (Arg1)));
10057
            DP := Fold_Upper (Name_Buffer (1));
10058
 
10059
            Lower_Bound := Expression (Arg2);
10060
            Check_Arg_Is_Static_Expression (Lower_Bound, Standard_Integer);
10061
            Lower_Val := Expr_Value (Lower_Bound);
10062
 
10063
            Upper_Bound := Expression (Arg3);
10064
            Check_Arg_Is_Static_Expression (Upper_Bound, Standard_Integer);
10065
            Upper_Val := Expr_Value (Upper_Bound);
10066
 
10067
            --  It is not allowed to use Task_Dispatching_Policy and
10068
            --  Priority_Specific_Dispatching in the same partition.
10069
 
10070
            if Task_Dispatching_Policy /= ' ' then
10071
               Error_Msg_Sloc := Task_Dispatching_Policy_Sloc;
10072
               Error_Pragma
10073
                 ("pragma% incompatible with Task_Dispatching_Policy#");
10074
 
10075
            --  Check lower bound in range
10076
 
10077
            elsif Lower_Val < Expr_Value (Type_Low_Bound (Prio_Id))
10078
                    or else
10079
                  Lower_Val > Expr_Value (Type_High_Bound (Prio_Id))
10080
            then
10081
               Error_Pragma_Arg
10082
                 ("first_priority is out of range", Arg2);
10083
 
10084
            --  Check upper bound in range
10085
 
10086
            elsif Upper_Val < Expr_Value (Type_Low_Bound (Prio_Id))
10087
                    or else
10088
                  Upper_Val > Expr_Value (Type_High_Bound (Prio_Id))
10089
            then
10090
               Error_Pragma_Arg
10091
                 ("last_priority is out of range", Arg3);
10092
 
10093
            --  Check that the priority range is valid
10094
 
10095
            elsif Lower_Val > Upper_Val then
10096
               Error_Pragma
10097
                 ("last_priority_expression must be greater than" &
10098
                  " or equal to first_priority_expression");
10099
 
10100
            --  Store the new policy, but always preserve System_Location since
10101
            --  we like the error message with the run-time name.
10102
 
10103
            else
10104
               --  Check overlapping in the priority ranges specified in other
10105
               --  Priority_Specific_Dispatching pragmas within the same
10106
               --  partition. We can only check those we know about!
10107
 
10108
               for J in
10109
                  Specific_Dispatching.First .. Specific_Dispatching.Last
10110
               loop
10111
                  if Specific_Dispatching.Table (J).First_Priority in
10112
                    UI_To_Int (Lower_Val) .. UI_To_Int (Upper_Val)
10113
                  or else Specific_Dispatching.Table (J).Last_Priority in
10114
                    UI_To_Int (Lower_Val) .. UI_To_Int (Upper_Val)
10115
                  then
10116
                     Error_Msg_Sloc :=
10117
                       Specific_Dispatching.Table (J).Pragma_Loc;
10118
                        Error_Pragma
10119
                          ("priority range overlaps with "
10120
                           & "Priority_Specific_Dispatching#");
10121
                  end if;
10122
               end loop;
10123
 
10124
               --  The use of Priority_Specific_Dispatching is incompatible
10125
               --  with Task_Dispatching_Policy.
10126
 
10127
               if Task_Dispatching_Policy /= ' ' then
10128
                  Error_Msg_Sloc := Task_Dispatching_Policy_Sloc;
10129
                     Error_Pragma
10130
                       ("Priority_Specific_Dispatching incompatible "
10131
                        & "with Task_Dispatching_Policy#");
10132
               end if;
10133
 
10134
               --  The use of Priority_Specific_Dispatching forces ceiling
10135
               --  locking policy.
10136
 
10137
               if Locking_Policy /= ' ' and then Locking_Policy /= 'C' then
10138
                  Error_Msg_Sloc := Locking_Policy_Sloc;
10139
                     Error_Pragma
10140
                       ("Priority_Specific_Dispatching incompatible "
10141
                        & "with Locking_Policy#");
10142
 
10143
               --  Set the Ceiling_Locking policy, but preserve System_Location
10144
               --  since we like the error message with the run time name.
10145
 
10146
               else
10147
                  Locking_Policy := 'C';
10148
 
10149
                  if Locking_Policy_Sloc /= System_Location then
10150
                     Locking_Policy_Sloc := Loc;
10151
                  end if;
10152
               end if;
10153
 
10154
               --  Add entry in the table
10155
 
10156
               Specific_Dispatching.Append
10157
                    ((Dispatching_Policy => DP,
10158
                      First_Priority     => UI_To_Int (Lower_Val),
10159
                      Last_Priority      => UI_To_Int (Upper_Val),
10160
                      Pragma_Loc         => Loc));
10161
            end if;
10162
         end Priority_Specific_Dispatching;
10163
 
10164
         -------------
10165
         -- Profile --
10166
         -------------
10167
 
10168
         --  pragma Profile (profile_IDENTIFIER);
10169
 
10170
         --  profile_IDENTIFIER => Restricted | Ravenscar
10171
 
10172
         when Pragma_Profile =>
10173
            Ada_2005_Pragma;
10174
            Check_Arg_Count (1);
10175
            Check_Valid_Configuration_Pragma;
10176
            Check_No_Identifiers;
10177
 
10178
            declare
10179
               Argx : constant Node_Id := Get_Pragma_Arg (Arg1);
10180
            begin
10181
               if Chars (Argx) = Name_Ravenscar then
10182
                  Set_Ravenscar_Profile (N);
10183
               elsif Chars (Argx) = Name_Restricted then
10184
                  Set_Profile_Restrictions
10185
                    (Restricted, N, Warn => Treat_Restrictions_As_Warnings);
10186
               else
10187
                  Error_Pragma_Arg ("& is not a valid profile", Argx);
10188
               end if;
10189
            end;
10190
 
10191
         ----------------------
10192
         -- Profile_Warnings --
10193
         ----------------------
10194
 
10195
         --  pragma Profile_Warnings (profile_IDENTIFIER);
10196
 
10197
         --  profile_IDENTIFIER => Restricted | Ravenscar
10198
 
10199
         when Pragma_Profile_Warnings =>
10200
            GNAT_Pragma;
10201
            Check_Arg_Count (1);
10202
            Check_Valid_Configuration_Pragma;
10203
            Check_No_Identifiers;
10204
 
10205
            declare
10206
               Argx : constant Node_Id := Get_Pragma_Arg (Arg1);
10207
            begin
10208
               if Chars (Argx) = Name_Ravenscar then
10209
                  Set_Profile_Restrictions (Ravenscar, N, Warn => True);
10210
               elsif Chars (Argx) = Name_Restricted then
10211
                  Set_Profile_Restrictions (Restricted, N, Warn => True);
10212
               else
10213
                  Error_Pragma_Arg ("& is not a valid profile", Argx);
10214
               end if;
10215
            end;
10216
 
10217
         --------------------------
10218
         -- Propagate_Exceptions --
10219
         --------------------------
10220
 
10221
         --  pragma Propagate_Exceptions;
10222
 
10223
         --  Note: this pragma is obsolete and has no effect
10224
 
10225
         when Pragma_Propagate_Exceptions =>
10226
            GNAT_Pragma;
10227
            Check_Arg_Count (0);
10228
 
10229
            if In_Extended_Main_Source_Unit (N) then
10230
               Propagate_Exceptions := True;
10231
            end if;
10232
 
10233
         ------------------
10234
         -- Psect_Object --
10235
         ------------------
10236
 
10237
         --  pragma Psect_Object (
10238
         --        [Internal =>] LOCAL_NAME,
10239
         --     [, [External =>] EXTERNAL_SYMBOL]
10240
         --     [, [Size     =>] EXTERNAL_SYMBOL]);
10241
 
10242
         when Pragma_Psect_Object | Pragma_Common_Object =>
10243
         Psect_Object : declare
10244
            Args  : Args_List (1 .. 3);
10245
            Names : constant Name_List (1 .. 3) := (
10246
                      Name_Internal,
10247
                      Name_External,
10248
                      Name_Size);
10249
 
10250
            Internal : Node_Id renames Args (1);
10251
            External : Node_Id renames Args (2);
10252
            Size     : Node_Id renames Args (3);
10253
 
10254
            Def_Id : Entity_Id;
10255
 
10256
            procedure Check_Too_Long (Arg : Node_Id);
10257
            --  Posts message if the argument is an identifier with more
10258
            --  than 31 characters, or a string literal with more than
10259
            --  31 characters, and we are operating under VMS
10260
 
10261
            --------------------
10262
            -- Check_Too_Long --
10263
            --------------------
10264
 
10265
            procedure Check_Too_Long (Arg : Node_Id) is
10266
               X : constant Node_Id := Original_Node (Arg);
10267
 
10268
            begin
10269
               if not Nkind_In (X, N_String_Literal, N_Identifier) then
10270
                  Error_Pragma_Arg
10271
                    ("inappropriate argument for pragma %", Arg);
10272
               end if;
10273
 
10274
               if OpenVMS_On_Target then
10275
                  if (Nkind (X) = N_String_Literal
10276
                       and then String_Length (Strval (X)) > 31)
10277
                    or else
10278
                     (Nkind (X) = N_Identifier
10279
                       and then Length_Of_Name (Chars (X)) > 31)
10280
                  then
10281
                     Error_Pragma_Arg
10282
                       ("argument for pragma % is longer than 31 characters",
10283
                        Arg);
10284
                  end if;
10285
               end if;
10286
            end Check_Too_Long;
10287
 
10288
         --  Start of processing for Common_Object/Psect_Object
10289
 
10290
         begin
10291
            GNAT_Pragma;
10292
            Gather_Associations (Names, Args);
10293
            Process_Extended_Import_Export_Internal_Arg (Internal);
10294
 
10295
            Def_Id := Entity (Internal);
10296
 
10297
            if Ekind (Def_Id) /= E_Constant
10298
              and then Ekind (Def_Id) /= E_Variable
10299
            then
10300
               Error_Pragma_Arg
10301
                 ("pragma% must designate an object", Internal);
10302
            end if;
10303
 
10304
            Check_Too_Long (Internal);
10305
 
10306
            if Is_Imported (Def_Id) or else Is_Exported (Def_Id) then
10307
               Error_Pragma_Arg
10308
                 ("cannot use pragma% for imported/exported object",
10309
                  Internal);
10310
            end if;
10311
 
10312
            if Is_Concurrent_Type (Etype (Internal)) then
10313
               Error_Pragma_Arg
10314
                 ("cannot specify pragma % for task/protected object",
10315
                  Internal);
10316
            end if;
10317
 
10318
            if Has_Rep_Pragma (Def_Id, Name_Common_Object)
10319
                 or else
10320
               Has_Rep_Pragma (Def_Id, Name_Psect_Object)
10321
            then
10322
               Error_Msg_N ("?duplicate Common/Psect_Object pragma", N);
10323
            end if;
10324
 
10325
            if Ekind (Def_Id) = E_Constant then
10326
               Error_Pragma_Arg
10327
                 ("cannot specify pragma % for a constant", Internal);
10328
            end if;
10329
 
10330
            if Is_Record_Type (Etype (Internal)) then
10331
               declare
10332
                  Ent  : Entity_Id;
10333
                  Decl : Entity_Id;
10334
 
10335
               begin
10336
                  Ent := First_Entity (Etype (Internal));
10337
                  while Present (Ent) loop
10338
                     Decl := Declaration_Node (Ent);
10339
 
10340
                     if Ekind (Ent) = E_Component
10341
                       and then Nkind (Decl) = N_Component_Declaration
10342
                       and then Present (Expression (Decl))
10343
                       and then Warn_On_Export_Import
10344
                     then
10345
                        Error_Msg_N
10346
                          ("?object for pragma % has defaults", Internal);
10347
                        exit;
10348
 
10349
                     else
10350
                        Next_Entity (Ent);
10351
                     end if;
10352
                  end loop;
10353
               end;
10354
            end if;
10355
 
10356
            if Present (Size) then
10357
               Check_Too_Long (Size);
10358
            end if;
10359
 
10360
            if Present (External) then
10361
               Check_Arg_Is_External_Name (External);
10362
               Check_Too_Long (External);
10363
            end if;
10364
 
10365
            --  If all error tests pass, link pragma on to the rep item chain
10366
 
10367
            Record_Rep_Item (Def_Id, N);
10368
         end Psect_Object;
10369
 
10370
         ----------
10371
         -- Pure --
10372
         ----------
10373
 
10374
         --  pragma Pure [(library_unit_NAME)];
10375
 
10376
         when Pragma_Pure => Pure : declare
10377
            Ent : Entity_Id;
10378
 
10379
         begin
10380
            Check_Ada_83_Warning;
10381
            Check_Valid_Library_Unit_Pragma;
10382
 
10383
            if Nkind (N) = N_Null_Statement then
10384
               return;
10385
            end if;
10386
 
10387
            Ent := Find_Lib_Unit_Name;
10388
            Set_Is_Pure (Ent);
10389
            Set_Has_Pragma_Pure (Ent);
10390
            Set_Suppress_Elaboration_Warnings (Ent);
10391
         end Pure;
10392
 
10393
         -------------
10394
         -- Pure_05 --
10395
         -------------
10396
 
10397
         --  pragma Pure_05 [(library_unit_NAME)];
10398
 
10399
         --  This pragma is useable only in GNAT_Mode, where it is used like
10400
         --  pragma Pure but it is only effective in Ada 2005 mode (otherwise
10401
         --  it is ignored). It may be used after a pragma Preelaborate, in
10402
         --  which case it overrides the effect of the pragma Preelaborate.
10403
         --  This is used to implement AI-362 which recategorizes some run-time
10404
         --  packages in Ada 2005 mode.
10405
 
10406
         when Pragma_Pure_05 => Pure_05 : declare
10407
            Ent : Entity_Id;
10408
 
10409
         begin
10410
            GNAT_Pragma;
10411
            Check_Valid_Library_Unit_Pragma;
10412
 
10413
            if not GNAT_Mode then
10414
               Error_Pragma ("pragma% only available in GNAT mode");
10415
            end if;
10416
 
10417
            if Nkind (N) = N_Null_Statement then
10418
               return;
10419
            end if;
10420
 
10421
            --  This is one of the few cases where we need to test the value of
10422
            --  Ada_Version_Explicit rather than Ada_Version (which is always
10423
            --  set to Ada_05 in a predefined unit), we need to know the
10424
            --  explicit version set to know if this pragma is active.
10425
 
10426
            if Ada_Version_Explicit >= Ada_05 then
10427
               Ent := Find_Lib_Unit_Name;
10428
               Set_Is_Preelaborated (Ent, False);
10429
               Set_Is_Pure (Ent);
10430
               Set_Suppress_Elaboration_Warnings (Ent);
10431
            end if;
10432
         end Pure_05;
10433
 
10434
         -------------------
10435
         -- Pure_Function --
10436
         -------------------
10437
 
10438
         --  pragma Pure_Function ([Entity =>] function_LOCAL_NAME);
10439
 
10440
         when Pragma_Pure_Function => Pure_Function : declare
10441
            E_Id      : Node_Id;
10442
            E         : Entity_Id;
10443
            Def_Id    : Entity_Id;
10444
            Effective : Boolean := False;
10445
 
10446
         begin
10447
            GNAT_Pragma;
10448
            Check_Arg_Count (1);
10449
            Check_Optional_Identifier (Arg1, Name_Entity);
10450
            Check_Arg_Is_Local_Name (Arg1);
10451
            E_Id := Expression (Arg1);
10452
 
10453
            if Error_Posted (E_Id) then
10454
               return;
10455
            end if;
10456
 
10457
            --  Loop through homonyms (overloadings) of referenced entity
10458
 
10459
            E := Entity (E_Id);
10460
 
10461
            if Present (E) then
10462
               loop
10463
                  Def_Id := Get_Base_Subprogram (E);
10464
 
10465
                  if Ekind (Def_Id) /= E_Function
10466
                    and then Ekind (Def_Id) /= E_Generic_Function
10467
                    and then Ekind (Def_Id) /= E_Operator
10468
                  then
10469
                     Error_Pragma_Arg
10470
                       ("pragma% requires a function name", Arg1);
10471
                  end if;
10472
 
10473
                  Set_Is_Pure (Def_Id);
10474
 
10475
                  if not Has_Pragma_Pure_Function (Def_Id) then
10476
                     Set_Has_Pragma_Pure_Function (Def_Id);
10477
                     Effective := True;
10478
                  end if;
10479
 
10480
                  E := Homonym (E);
10481
                  exit when No (E) or else Scope (E) /= Current_Scope;
10482
               end loop;
10483
 
10484
               if not Effective
10485
                 and then Warn_On_Redundant_Constructs
10486
               then
10487
                  Error_Msg_NE ("pragma Pure_Function on& is redundant?",
10488
                    N, Entity (E_Id));
10489
               end if;
10490
            end if;
10491
         end Pure_Function;
10492
 
10493
         --------------------
10494
         -- Queuing_Policy --
10495
         --------------------
10496
 
10497
         --  pragma Queuing_Policy (policy_IDENTIFIER);
10498
 
10499
         when Pragma_Queuing_Policy => declare
10500
            QP : Character;
10501
 
10502
         begin
10503
            Check_Ada_83_Warning;
10504
            Check_Arg_Count (1);
10505
            Check_No_Identifiers;
10506
            Check_Arg_Is_Queuing_Policy (Arg1);
10507
            Check_Valid_Configuration_Pragma;
10508
            Get_Name_String (Chars (Expression (Arg1)));
10509
            QP := Fold_Upper (Name_Buffer (1));
10510
 
10511
            if Queuing_Policy /= ' '
10512
              and then Queuing_Policy /= QP
10513
            then
10514
               Error_Msg_Sloc := Queuing_Policy_Sloc;
10515
               Error_Pragma ("queuing policy incompatible with policy#");
10516
 
10517
            --  Set new policy, but always preserve System_Location since we
10518
            --  like the error message with the run time name.
10519
 
10520
            else
10521
               Queuing_Policy := QP;
10522
 
10523
               if Queuing_Policy_Sloc /= System_Location then
10524
                  Queuing_Policy_Sloc := Loc;
10525
               end if;
10526
            end if;
10527
         end;
10528
 
10529
         -----------------------
10530
         -- Relative_Deadline --
10531
         -----------------------
10532
 
10533
         --  pragma Relative_Deadline (time_span_EXPRESSION);
10534
 
10535
         when Pragma_Relative_Deadline => Relative_Deadline : declare
10536
            P   : constant Node_Id := Parent (N);
10537
            Arg : Node_Id;
10538
 
10539
         begin
10540
            Ada_2005_Pragma;
10541
            Check_No_Identifiers;
10542
            Check_Arg_Count (1);
10543
 
10544
            Arg := Expression (Arg1);
10545
 
10546
            --  The expression must be analyzed in the special manner described
10547
            --  in "Handling of Default and Per-Object Expressions" in sem.ads.
10548
 
10549
            Preanalyze_Spec_Expression (Arg, RTE (RE_Time_Span));
10550
 
10551
            --  Subprogram case
10552
 
10553
            if Nkind (P) = N_Subprogram_Body then
10554
               Check_In_Main_Program;
10555
 
10556
            --  Tasks
10557
 
10558
            elsif Nkind (P) = N_Task_Definition then
10559
               null;
10560
 
10561
            --  Anything else is incorrect
10562
 
10563
            else
10564
               Pragma_Misplaced;
10565
            end if;
10566
 
10567
            if Has_Relative_Deadline_Pragma (P) then
10568
               Error_Pragma ("duplicate pragma% not allowed");
10569
            else
10570
               Set_Has_Relative_Deadline_Pragma (P, True);
10571
 
10572
               if Nkind (P) = N_Task_Definition then
10573
                  Record_Rep_Item (Defining_Identifier (Parent (P)), N);
10574
               end if;
10575
            end if;
10576
         end Relative_Deadline;
10577
 
10578
         ---------------------------
10579
         -- Remote_Call_Interface --
10580
         ---------------------------
10581
 
10582
         --  pragma Remote_Call_Interface [(library_unit_NAME)];
10583
 
10584
         when Pragma_Remote_Call_Interface => Remote_Call_Interface : declare
10585
            Cunit_Node : Node_Id;
10586
            Cunit_Ent  : Entity_Id;
10587
            K          : Node_Kind;
10588
 
10589
         begin
10590
            Check_Ada_83_Warning;
10591
            Check_Valid_Library_Unit_Pragma;
10592
 
10593
            if Nkind (N) = N_Null_Statement then
10594
               return;
10595
            end if;
10596
 
10597
            Cunit_Node := Cunit (Current_Sem_Unit);
10598
            K          := Nkind (Unit (Cunit_Node));
10599
            Cunit_Ent  := Cunit_Entity (Current_Sem_Unit);
10600
 
10601
            if K = N_Package_Declaration
10602
              or else K = N_Generic_Package_Declaration
10603
              or else K = N_Subprogram_Declaration
10604
              or else K = N_Generic_Subprogram_Declaration
10605
              or else (K = N_Subprogram_Body
10606
                         and then Acts_As_Spec (Unit (Cunit_Node)))
10607
            then
10608
               null;
10609
            else
10610
               Error_Pragma (
10611
                 "pragma% must apply to package or subprogram declaration");
10612
            end if;
10613
 
10614
            Set_Is_Remote_Call_Interface (Cunit_Ent);
10615
         end Remote_Call_Interface;
10616
 
10617
         ------------------
10618
         -- Remote_Types --
10619
         ------------------
10620
 
10621
         --  pragma Remote_Types [(library_unit_NAME)];
10622
 
10623
         when Pragma_Remote_Types => Remote_Types : declare
10624
            Cunit_Node : Node_Id;
10625
            Cunit_Ent  : Entity_Id;
10626
 
10627
         begin
10628
            Check_Ada_83_Warning;
10629
            Check_Valid_Library_Unit_Pragma;
10630
 
10631
            if Nkind (N) = N_Null_Statement then
10632
               return;
10633
            end if;
10634
 
10635
            Cunit_Node := Cunit (Current_Sem_Unit);
10636
            Cunit_Ent  := Cunit_Entity (Current_Sem_Unit);
10637
 
10638
            if not Nkind_In (Unit (Cunit_Node), N_Package_Declaration,
10639
                                                N_Generic_Package_Declaration)
10640
            then
10641
               Error_Pragma
10642
                 ("pragma% can only apply to a package declaration");
10643
            end if;
10644
 
10645
            Set_Is_Remote_Types (Cunit_Ent);
10646
         end Remote_Types;
10647
 
10648
         ---------------
10649
         -- Ravenscar --
10650
         ---------------
10651
 
10652
         --  pragma Ravenscar;
10653
 
10654
         when Pragma_Ravenscar =>
10655
            GNAT_Pragma;
10656
            Check_Arg_Count (0);
10657
            Check_Valid_Configuration_Pragma;
10658
            Set_Ravenscar_Profile (N);
10659
 
10660
            if Warn_On_Obsolescent_Feature then
10661
               Error_Msg_N
10662
                 ("pragma Ravenscar is an obsolescent feature?", N);
10663
               Error_Msg_N
10664
                 ("|use pragma Profile (Ravenscar) instead", N);
10665
            end if;
10666
 
10667
         -------------------------
10668
         -- Restricted_Run_Time --
10669
         -------------------------
10670
 
10671
         --  pragma Restricted_Run_Time;
10672
 
10673
         when Pragma_Restricted_Run_Time =>
10674
            GNAT_Pragma;
10675
            Check_Arg_Count (0);
10676
            Check_Valid_Configuration_Pragma;
10677
            Set_Profile_Restrictions
10678
              (Restricted, N, Warn => Treat_Restrictions_As_Warnings);
10679
 
10680
            if Warn_On_Obsolescent_Feature then
10681
               Error_Msg_N
10682
                 ("pragma Restricted_Run_Time is an obsolescent feature?", N);
10683
               Error_Msg_N
10684
                 ("|use pragma Profile (Restricted) instead", N);
10685
            end if;
10686
 
10687
         ------------------
10688
         -- Restrictions --
10689
         ------------------
10690
 
10691
         --  pragma Restrictions (RESTRICTION {, RESTRICTION});
10692
 
10693
         --  RESTRICTION ::=
10694
         --    restriction_IDENTIFIER
10695
         --  | restriction_parameter_IDENTIFIER => EXPRESSION
10696
 
10697
         when Pragma_Restrictions =>
10698
            Process_Restrictions_Or_Restriction_Warnings
10699
              (Warn => Treat_Restrictions_As_Warnings);
10700
 
10701
         --------------------------
10702
         -- Restriction_Warnings --
10703
         --------------------------
10704
 
10705
         --  pragma Restriction_Warnings (RESTRICTION {, RESTRICTION});
10706
 
10707
         --  RESTRICTION ::=
10708
         --    restriction_IDENTIFIER
10709
         --  | restriction_parameter_IDENTIFIER => EXPRESSION
10710
 
10711
         when Pragma_Restriction_Warnings =>
10712
            GNAT_Pragma;
10713
            Process_Restrictions_Or_Restriction_Warnings (Warn => True);
10714
 
10715
         ----------------
10716
         -- Reviewable --
10717
         ----------------
10718
 
10719
         --  pragma Reviewable;
10720
 
10721
         when Pragma_Reviewable =>
10722
            Check_Ada_83_Warning;
10723
            Check_Arg_Count (0);
10724
 
10725
            --  Call dummy debugging function rv. This is done to assist front
10726
            --  end debugging. By placing a Reviewable pragma in the source
10727
            --  program, a breakpoint on rv catches this place in the source,
10728
            --  allowing convenient stepping to the point of interest.
10729
 
10730
            rv;
10731
 
10732
         --------------------------
10733
         -- Short_Circuit_And_Or --
10734
         --------------------------
10735
 
10736
         when Pragma_Short_Circuit_And_Or =>
10737
            GNAT_Pragma;
10738
            Check_Arg_Count (0);
10739
            Check_Valid_Configuration_Pragma;
10740
            Short_Circuit_And_Or := True;
10741
 
10742
         -------------------
10743
         -- Share_Generic --
10744
         -------------------
10745
 
10746
         --  pragma Share_Generic (NAME {, NAME});
10747
 
10748
         when Pragma_Share_Generic =>
10749
            GNAT_Pragma;
10750
            Process_Generic_List;
10751
 
10752
         ------------
10753
         -- Shared --
10754
         ------------
10755
 
10756
         --  pragma Shared (LOCAL_NAME);
10757
 
10758
         when Pragma_Shared =>
10759
            GNAT_Pragma;
10760
            Process_Atomic_Shared_Volatile;
10761
 
10762
         --------------------
10763
         -- Shared_Passive --
10764
         --------------------
10765
 
10766
         --  pragma Shared_Passive [(library_unit_NAME)];
10767
 
10768
         --  Set the flag Is_Shared_Passive of program unit name entity
10769
 
10770
         when Pragma_Shared_Passive => Shared_Passive : declare
10771
            Cunit_Node : Node_Id;
10772
            Cunit_Ent  : Entity_Id;
10773
 
10774
         begin
10775
            Check_Ada_83_Warning;
10776
            Check_Valid_Library_Unit_Pragma;
10777
 
10778
            if Nkind (N) = N_Null_Statement then
10779
               return;
10780
            end if;
10781
 
10782
            Cunit_Node := Cunit (Current_Sem_Unit);
10783
            Cunit_Ent  := Cunit_Entity (Current_Sem_Unit);
10784
 
10785
            if not Nkind_In (Unit (Cunit_Node), N_Package_Declaration,
10786
                                                N_Generic_Package_Declaration)
10787
            then
10788
               Error_Pragma
10789
                 ("pragma% can only apply to a package declaration");
10790
            end if;
10791
 
10792
            Set_Is_Shared_Passive (Cunit_Ent);
10793
         end Shared_Passive;
10794
 
10795
         ----------------------
10796
         -- Source_File_Name --
10797
         ----------------------
10798
 
10799
         --  There are five forms for this pragma:
10800
 
10801
         --  pragma Source_File_Name (
10802
         --    [UNIT_NAME      =>] unit_NAME,
10803
         --     BODY_FILE_NAME =>  STRING_LITERAL
10804
         --    [, [INDEX =>] INTEGER_LITERAL]);
10805
 
10806
         --  pragma Source_File_Name (
10807
         --    [UNIT_NAME      =>] unit_NAME,
10808
         --     SPEC_FILE_NAME =>  STRING_LITERAL
10809
         --    [, [INDEX =>] INTEGER_LITERAL]);
10810
 
10811
         --  pragma Source_File_Name (
10812
         --     BODY_FILE_NAME  => STRING_LITERAL
10813
         --  [, DOT_REPLACEMENT => STRING_LITERAL]
10814
         --  [, CASING          => CASING_SPEC]);
10815
 
10816
         --  pragma Source_File_Name (
10817
         --     SPEC_FILE_NAME  => STRING_LITERAL
10818
         --  [, DOT_REPLACEMENT => STRING_LITERAL]
10819
         --  [, CASING          => CASING_SPEC]);
10820
 
10821
         --  pragma Source_File_Name (
10822
         --     SUBUNIT_FILE_NAME  => STRING_LITERAL
10823
         --  [, DOT_REPLACEMENT    => STRING_LITERAL]
10824
         --  [, CASING             => CASING_SPEC]);
10825
 
10826
         --  CASING_SPEC ::= Uppercase | Lowercase | Mixedcase
10827
 
10828
         --  Pragma Source_File_Name_Project (SFNP) is equivalent to pragma
10829
         --  Source_File_Name (SFN), however their usage is exclusive: SFN can
10830
         --  only be used when no project file is used, while SFNP can only be
10831
         --  used when a project file is used.
10832
 
10833
         --  No processing here. Processing was completed during parsing, since
10834
         --  we need to have file names set as early as possible. Units are
10835
         --  loaded well before semantic processing starts.
10836
 
10837
         --  The only processing we defer to this point is the check for
10838
         --  correct placement.
10839
 
10840
         when Pragma_Source_File_Name =>
10841
            GNAT_Pragma;
10842
            Check_Valid_Configuration_Pragma;
10843
 
10844
         ------------------------------
10845
         -- Source_File_Name_Project --
10846
         ------------------------------
10847
 
10848
         --  See Source_File_Name for syntax
10849
 
10850
         --  No processing here. Processing was completed during parsing, since
10851
         --  we need to have file names set as early as possible. Units are
10852
         --  loaded well before semantic processing starts.
10853
 
10854
         --  The only processing we defer to this point is the check for
10855
         --  correct placement.
10856
 
10857
         when Pragma_Source_File_Name_Project =>
10858
            GNAT_Pragma;
10859
            Check_Valid_Configuration_Pragma;
10860
 
10861
            --  Check that a pragma Source_File_Name_Project is used only in a
10862
            --  configuration pragmas file.
10863
 
10864
            --  Pragmas Source_File_Name_Project should only be generated by
10865
            --  the Project Manager in configuration pragmas files.
10866
 
10867
            --  This is really an ugly test. It seems to depend on some
10868
            --  accidental and undocumented property. At the very least it
10869
            --  needs to be documented, but it would be better to have a
10870
            --  clean way of testing if we are in a configuration file???
10871
 
10872
            if Present (Parent (N)) then
10873
               Error_Pragma
10874
                 ("pragma% can only appear in a configuration pragmas file");
10875
            end if;
10876
 
10877
         ----------------------
10878
         -- Source_Reference --
10879
         ----------------------
10880
 
10881
         --  pragma Source_Reference (INTEGER_LITERAL [, STRING_LITERAL]);
10882
 
10883
         --  Nothing to do, all processing completed in Par.Prag, since we need
10884
         --  the information for possible parser messages that are output.
10885
 
10886
         when Pragma_Source_Reference =>
10887
            GNAT_Pragma;
10888
 
10889
         --------------------------------
10890
         -- Static_Elaboration_Desired --
10891
         --------------------------------
10892
 
10893
         --  pragma Static_Elaboration_Desired (DIRECT_NAME);
10894
 
10895
         when Pragma_Static_Elaboration_Desired =>
10896
            GNAT_Pragma;
10897
            Check_At_Most_N_Arguments (1);
10898
 
10899
            if Is_Compilation_Unit (Current_Scope)
10900
              and then Ekind (Current_Scope) = E_Package
10901
            then
10902
               Set_Static_Elaboration_Desired (Current_Scope, True);
10903
            else
10904
               Error_Pragma ("pragma% must apply to a library-level package");
10905
            end if;
10906
 
10907
         ------------------
10908
         -- Storage_Size --
10909
         ------------------
10910
 
10911
         --  pragma Storage_Size (EXPRESSION);
10912
 
10913
         when Pragma_Storage_Size => Storage_Size : declare
10914
            P   : constant Node_Id := Parent (N);
10915
            Arg : Node_Id;
10916
 
10917
         begin
10918
            Check_No_Identifiers;
10919
            Check_Arg_Count (1);
10920
 
10921
            --  The expression must be analyzed in the special manner described
10922
            --  in "Handling of Default Expressions" in sem.ads.
10923
 
10924
            Arg := Expression (Arg1);
10925
            Preanalyze_Spec_Expression (Arg, Any_Integer);
10926
 
10927
            if not Is_Static_Expression (Arg) then
10928
               Check_Restriction (Static_Storage_Size, Arg);
10929
            end if;
10930
 
10931
            if Nkind (P) /= N_Task_Definition then
10932
               Pragma_Misplaced;
10933
               return;
10934
 
10935
            else
10936
               if Has_Storage_Size_Pragma (P) then
10937
                  Error_Pragma ("duplicate pragma% not allowed");
10938
               else
10939
                  Set_Has_Storage_Size_Pragma (P, True);
10940
               end if;
10941
 
10942
               Record_Rep_Item (Defining_Identifier (Parent (P)), N);
10943
               --  ???  exp_ch9 should use this!
10944
            end if;
10945
         end Storage_Size;
10946
 
10947
         ------------------
10948
         -- Storage_Unit --
10949
         ------------------
10950
 
10951
         --  pragma Storage_Unit (NUMERIC_LITERAL);
10952
 
10953
         --  Only permitted argument is System'Storage_Unit value
10954
 
10955
         when Pragma_Storage_Unit =>
10956
            Check_No_Identifiers;
10957
            Check_Arg_Count (1);
10958
            Check_Arg_Is_Integer_Literal (Arg1);
10959
 
10960
            if Intval (Expression (Arg1)) /=
10961
              UI_From_Int (Ttypes.System_Storage_Unit)
10962
            then
10963
               Error_Msg_Uint_1 := UI_From_Int (Ttypes.System_Storage_Unit);
10964
               Error_Pragma_Arg
10965
                 ("the only allowed argument for pragma% is ^", Arg1);
10966
            end if;
10967
 
10968
         --------------------
10969
         -- Stream_Convert --
10970
         --------------------
10971
 
10972
         --  pragma Stream_Convert (
10973
         --    [Entity =>] type_LOCAL_NAME,
10974
         --    [Read   =>] function_NAME,
10975
         --    [Write  =>] function NAME);
10976
 
10977
         when Pragma_Stream_Convert => Stream_Convert : declare
10978
 
10979
            procedure Check_OK_Stream_Convert_Function (Arg : Node_Id);
10980
            --  Check that the given argument is the name of a local function
10981
            --  of one argument that is not overloaded earlier in the current
10982
            --  local scope. A check is also made that the argument is a
10983
            --  function with one parameter.
10984
 
10985
            --------------------------------------
10986
            -- Check_OK_Stream_Convert_Function --
10987
            --------------------------------------
10988
 
10989
            procedure Check_OK_Stream_Convert_Function (Arg : Node_Id) is
10990
               Ent : Entity_Id;
10991
 
10992
            begin
10993
               Check_Arg_Is_Local_Name (Arg);
10994
               Ent := Entity (Expression (Arg));
10995
 
10996
               if Has_Homonym (Ent) then
10997
                  Error_Pragma_Arg
10998
                    ("argument for pragma% may not be overloaded", Arg);
10999
               end if;
11000
 
11001
               if Ekind (Ent) /= E_Function
11002
                 or else No (First_Formal (Ent))
11003
                 or else Present (Next_Formal (First_Formal (Ent)))
11004
               then
11005
                  Error_Pragma_Arg
11006
                    ("argument for pragma% must be" &
11007
                     " function of one argument", Arg);
11008
               end if;
11009
            end Check_OK_Stream_Convert_Function;
11010
 
11011
         --  Start of processing for Stream_Convert
11012
 
11013
         begin
11014
            GNAT_Pragma;
11015
            Check_Arg_Order ((Name_Entity, Name_Read, Name_Write));
11016
            Check_Arg_Count (3);
11017
            Check_Optional_Identifier (Arg1, Name_Entity);
11018
            Check_Optional_Identifier (Arg2, Name_Read);
11019
            Check_Optional_Identifier (Arg3, Name_Write);
11020
            Check_Arg_Is_Local_Name (Arg1);
11021
            Check_OK_Stream_Convert_Function (Arg2);
11022
            Check_OK_Stream_Convert_Function (Arg3);
11023
 
11024
            declare
11025
               Typ   : constant Entity_Id :=
11026
                         Underlying_Type (Entity (Expression (Arg1)));
11027
               Read  : constant Entity_Id := Entity (Expression (Arg2));
11028
               Write : constant Entity_Id := Entity (Expression (Arg3));
11029
 
11030
            begin
11031
               Check_First_Subtype (Arg1);
11032
 
11033
               --  Check for too early or too late. Note that we don't enforce
11034
               --  the rule about primitive operations in this case, since, as
11035
               --  is the case for explicit stream attributes themselves, these
11036
               --  restrictions are not appropriate. Note that the chaining of
11037
               --  the pragma by Rep_Item_Too_Late is actually the critical
11038
               --  processing done for this pragma.
11039
 
11040
               if Rep_Item_Too_Early (Typ, N)
11041
                    or else
11042
                  Rep_Item_Too_Late (Typ, N, FOnly => True)
11043
               then
11044
                  return;
11045
               end if;
11046
 
11047
               --  Return if previous error
11048
 
11049
               if Etype (Typ) = Any_Type
11050
                    or else
11051
                  Etype (Read) = Any_Type
11052
                    or else
11053
                  Etype (Write) = Any_Type
11054
               then
11055
                  return;
11056
               end if;
11057
 
11058
               --  Error checks
11059
 
11060
               if Underlying_Type (Etype (Read)) /= Typ then
11061
                  Error_Pragma_Arg
11062
                    ("incorrect return type for function&", Arg2);
11063
               end if;
11064
 
11065
               if Underlying_Type (Etype (First_Formal (Write))) /= Typ then
11066
                  Error_Pragma_Arg
11067
                    ("incorrect parameter type for function&", Arg3);
11068
               end if;
11069
 
11070
               if Underlying_Type (Etype (First_Formal (Read))) /=
11071
                  Underlying_Type (Etype (Write))
11072
               then
11073
                  Error_Pragma_Arg
11074
                    ("result type of & does not match Read parameter type",
11075
                     Arg3);
11076
               end if;
11077
            end;
11078
         end Stream_Convert;
11079
 
11080
         -------------------------
11081
         -- Style_Checks (GNAT) --
11082
         -------------------------
11083
 
11084
         --  pragma Style_Checks (On | Off | ALL_CHECKS | STRING_LITERAL);
11085
 
11086
         --  This is processed by the parser since some of the style checks
11087
         --  take place during source scanning and parsing. This means that
11088
         --  we don't need to issue error messages here.
11089
 
11090
         when Pragma_Style_Checks => Style_Checks : declare
11091
            A  : constant Node_Id   := Expression (Arg1);
11092
            S  : String_Id;
11093
            C  : Char_Code;
11094
 
11095
         begin
11096
            GNAT_Pragma;
11097
            Check_No_Identifiers;
11098
 
11099
            --  Two argument form
11100
 
11101
            if Arg_Count = 2 then
11102
               Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
11103
 
11104
               declare
11105
                  E_Id : Node_Id;
11106
                  E    : Entity_Id;
11107
 
11108
               begin
11109
                  E_Id := Expression (Arg2);
11110
                  Analyze (E_Id);
11111
 
11112
                  if not Is_Entity_Name (E_Id) then
11113
                     Error_Pragma_Arg
11114
                       ("second argument of pragma% must be entity name",
11115
                        Arg2);
11116
                  end if;
11117
 
11118
                  E := Entity (E_Id);
11119
 
11120
                  if E = Any_Id then
11121
                     return;
11122
                  else
11123
                     loop
11124
                        Set_Suppress_Style_Checks (E,
11125
                          (Chars (Expression (Arg1)) = Name_Off));
11126
                        exit when No (Homonym (E));
11127
                        E := Homonym (E);
11128
                     end loop;
11129
                  end if;
11130
               end;
11131
 
11132
            --  One argument form
11133
 
11134
            else
11135
               Check_Arg_Count (1);
11136
 
11137
               if Nkind (A) = N_String_Literal then
11138
                  S   := Strval (A);
11139
 
11140
                  declare
11141
                     Slen    : constant Natural := Natural (String_Length (S));
11142
                     Options : String (1 .. Slen);
11143
                     J       : Natural;
11144
 
11145
                  begin
11146
                     J := 1;
11147
                     loop
11148
                        C := Get_String_Char (S, Int (J));
11149
                        exit when not In_Character_Range (C);
11150
                        Options (J) := Get_Character (C);
11151
 
11152
                        --  If at end of string, set options. As per discussion
11153
                        --  above, no need to check for errors, since we issued
11154
                        --  them in the parser.
11155
 
11156
                        if J = Slen then
11157
                           Set_Style_Check_Options (Options);
11158
                           exit;
11159
                        end if;
11160
 
11161
                        J := J + 1;
11162
                     end loop;
11163
                  end;
11164
 
11165
               elsif Nkind (A) = N_Identifier then
11166
                  if Chars (A) = Name_All_Checks then
11167
                     Set_Default_Style_Check_Options;
11168
 
11169
                  elsif Chars (A) = Name_On then
11170
                     Style_Check := True;
11171
 
11172
                  elsif Chars (A) = Name_Off then
11173
                     Style_Check := False;
11174
                  end if;
11175
               end if;
11176
            end if;
11177
         end Style_Checks;
11178
 
11179
         --------------
11180
         -- Subtitle --
11181
         --------------
11182
 
11183
         --  pragma Subtitle ([Subtitle =>] STRING_LITERAL);
11184
 
11185
         when Pragma_Subtitle =>
11186
            GNAT_Pragma;
11187
            Check_Arg_Count (1);
11188
            Check_Optional_Identifier (Arg1, Name_Subtitle);
11189
            Check_Arg_Is_String_Literal (Arg1);
11190
 
11191
         --------------
11192
         -- Suppress --
11193
         --------------
11194
 
11195
         --  pragma Suppress (IDENTIFIER [, [On =>] NAME]);
11196
 
11197
         when Pragma_Suppress =>
11198
            Process_Suppress_Unsuppress (True);
11199
 
11200
         ------------------
11201
         -- Suppress_All --
11202
         ------------------
11203
 
11204
         --  pragma Suppress_All;
11205
 
11206
         --  The only check made here is that the pragma appears in the proper
11207
         --  place, i.e. following a compilation unit. If indeed it appears in
11208
         --  this context, then the parser has already inserted an equivalent
11209
         --  pragma Suppress (All_Checks) to get the required effect.
11210
 
11211
         when Pragma_Suppress_All =>
11212
            GNAT_Pragma;
11213
            Check_Arg_Count (0);
11214
 
11215
            if Nkind (Parent (N)) /= N_Compilation_Unit_Aux
11216
              or else not Is_List_Member (N)
11217
              or else List_Containing (N) /= Pragmas_After (Parent (N))
11218
            then
11219
               Error_Pragma
11220
                 ("misplaced pragma%, must follow compilation unit");
11221
            end if;
11222
 
11223
         -------------------------
11224
         -- Suppress_Debug_Info --
11225
         -------------------------
11226
 
11227
         --  pragma Suppress_Debug_Info ([Entity =>] LOCAL_NAME);
11228
 
11229
         when Pragma_Suppress_Debug_Info =>
11230
            GNAT_Pragma;
11231
            Check_Arg_Count (1);
11232
            Check_Optional_Identifier (Arg1, Name_Entity);
11233
            Check_Arg_Is_Local_Name (Arg1);
11234
            Set_Debug_Info_Off (Entity (Get_Pragma_Arg (Arg1)));
11235
 
11236
         ----------------------------------
11237
         -- Suppress_Exception_Locations --
11238
         ----------------------------------
11239
 
11240
         --  pragma Suppress_Exception_Locations;
11241
 
11242
         when Pragma_Suppress_Exception_Locations =>
11243
            GNAT_Pragma;
11244
            Check_Arg_Count (0);
11245
            Check_Valid_Configuration_Pragma;
11246
            Exception_Locations_Suppressed := True;
11247
 
11248
         -----------------------------
11249
         -- Suppress_Initialization --
11250
         -----------------------------
11251
 
11252
         --  pragma Suppress_Initialization ([Entity =>] type_Name);
11253
 
11254
         when Pragma_Suppress_Initialization => Suppress_Init : declare
11255
            E_Id : Node_Id;
11256
            E    : Entity_Id;
11257
 
11258
         begin
11259
            GNAT_Pragma;
11260
            Check_Arg_Count (1);
11261
            Check_Optional_Identifier (Arg1, Name_Entity);
11262
            Check_Arg_Is_Local_Name (Arg1);
11263
 
11264
            E_Id := Expression (Arg1);
11265
 
11266
            if Etype (E_Id) = Any_Type then
11267
               return;
11268
            end if;
11269
 
11270
            E := Entity (E_Id);
11271
 
11272
            if Is_Type (E) then
11273
               if Is_Incomplete_Or_Private_Type (E) then
11274
                  if No (Full_View (Base_Type (E))) then
11275
                     Error_Pragma_Arg
11276
                       ("argument of pragma% cannot be an incomplete type",
11277
                         Arg1);
11278
                  else
11279
                     Set_Suppress_Init_Proc (Full_View (Base_Type (E)));
11280
                  end if;
11281
               else
11282
                  Set_Suppress_Init_Proc (Base_Type (E));
11283
               end if;
11284
 
11285
            else
11286
               Error_Pragma_Arg
11287
                 ("pragma% requires argument that is a type name", Arg1);
11288
            end if;
11289
         end Suppress_Init;
11290
 
11291
         -----------------
11292
         -- System_Name --
11293
         -----------------
11294
 
11295
         --  pragma System_Name (DIRECT_NAME);
11296
 
11297
         --  Syntax check: one argument, which must be the identifier GNAT or
11298
         --  the identifier GCC, no other identifiers are acceptable.
11299
 
11300
         when Pragma_System_Name =>
11301
            GNAT_Pragma;
11302
            Check_No_Identifiers;
11303
            Check_Arg_Count (1);
11304
            Check_Arg_Is_One_Of (Arg1, Name_Gcc, Name_Gnat);
11305
 
11306
         -----------------------------
11307
         -- Task_Dispatching_Policy --
11308
         -----------------------------
11309
 
11310
         --  pragma Task_Dispatching_Policy (policy_IDENTIFIER);
11311
 
11312
         when Pragma_Task_Dispatching_Policy => declare
11313
            DP : Character;
11314
 
11315
         begin
11316
            Check_Ada_83_Warning;
11317
            Check_Arg_Count (1);
11318
            Check_No_Identifiers;
11319
            Check_Arg_Is_Task_Dispatching_Policy (Arg1);
11320
            Check_Valid_Configuration_Pragma;
11321
            Get_Name_String (Chars (Expression (Arg1)));
11322
            DP := Fold_Upper (Name_Buffer (1));
11323
 
11324
            if Task_Dispatching_Policy /= ' '
11325
              and then Task_Dispatching_Policy /= DP
11326
            then
11327
               Error_Msg_Sloc := Task_Dispatching_Policy_Sloc;
11328
               Error_Pragma
11329
                 ("task dispatching policy incompatible with policy#");
11330
 
11331
            --  Set new policy, but always preserve System_Location since we
11332
            --  like the error message with the run time name.
11333
 
11334
            else
11335
               Task_Dispatching_Policy := DP;
11336
 
11337
               if Task_Dispatching_Policy_Sloc /= System_Location then
11338
                  Task_Dispatching_Policy_Sloc := Loc;
11339
               end if;
11340
            end if;
11341
         end;
11342
 
11343
         --------------
11344
         -- Task_Info --
11345
         --------------
11346
 
11347
         --  pragma Task_Info (EXPRESSION);
11348
 
11349
         when Pragma_Task_Info => Task_Info : declare
11350
            P : constant Node_Id := Parent (N);
11351
 
11352
         begin
11353
            GNAT_Pragma;
11354
 
11355
            if Nkind (P) /= N_Task_Definition then
11356
               Error_Pragma ("pragma% must appear in task definition");
11357
            end if;
11358
 
11359
            Check_No_Identifiers;
11360
            Check_Arg_Count (1);
11361
 
11362
            Analyze_And_Resolve (Expression (Arg1), RTE (RE_Task_Info_Type));
11363
 
11364
            if Etype (Expression (Arg1)) = Any_Type then
11365
               return;
11366
            end if;
11367
 
11368
            if Has_Task_Info_Pragma (P) then
11369
               Error_Pragma ("duplicate pragma% not allowed");
11370
            else
11371
               Set_Has_Task_Info_Pragma (P, True);
11372
            end if;
11373
         end Task_Info;
11374
 
11375
         ---------------
11376
         -- Task_Name --
11377
         ---------------
11378
 
11379
         --  pragma Task_Name (string_EXPRESSION);
11380
 
11381
         when Pragma_Task_Name => Task_Name : declare
11382
            P   : constant Node_Id := Parent (N);
11383
            Arg : Node_Id;
11384
 
11385
         begin
11386
            Check_No_Identifiers;
11387
            Check_Arg_Count (1);
11388
 
11389
            Arg := Expression (Arg1);
11390
 
11391
            --  The expression is used in the call to Create_Task, and must be
11392
            --  expanded there, not in the context of the current spec. It must
11393
            --  however be analyzed to capture global references, in case it
11394
            --  appears in a generic context.
11395
 
11396
            Preanalyze_And_Resolve (Arg, Standard_String);
11397
 
11398
            if Nkind (P) /= N_Task_Definition then
11399
               Pragma_Misplaced;
11400
            end if;
11401
 
11402
            if Has_Task_Name_Pragma (P) then
11403
               Error_Pragma ("duplicate pragma% not allowed");
11404
            else
11405
               Set_Has_Task_Name_Pragma (P, True);
11406
               Record_Rep_Item (Defining_Identifier (Parent (P)), N);
11407
            end if;
11408
         end Task_Name;
11409
 
11410
         ------------------
11411
         -- Task_Storage --
11412
         ------------------
11413
 
11414
         --  pragma Task_Storage (
11415
         --     [Task_Type =>] LOCAL_NAME,
11416
         --     [Top_Guard =>] static_integer_EXPRESSION);
11417
 
11418
         when Pragma_Task_Storage => Task_Storage : declare
11419
            Args  : Args_List (1 .. 2);
11420
            Names : constant Name_List (1 .. 2) := (
11421
                      Name_Task_Type,
11422
                      Name_Top_Guard);
11423
 
11424
            Task_Type : Node_Id renames Args (1);
11425
            Top_Guard : Node_Id renames Args (2);
11426
 
11427
            Ent : Entity_Id;
11428
 
11429
         begin
11430
            GNAT_Pragma;
11431
            Gather_Associations (Names, Args);
11432
 
11433
            if No (Task_Type) then
11434
               Error_Pragma
11435
                 ("missing task_type argument for pragma%");
11436
            end if;
11437
 
11438
            Check_Arg_Is_Local_Name (Task_Type);
11439
 
11440
            Ent := Entity (Task_Type);
11441
 
11442
            if not Is_Task_Type (Ent) then
11443
               Error_Pragma_Arg
11444
                 ("argument for pragma% must be task type", Task_Type);
11445
            end if;
11446
 
11447
            if No (Top_Guard) then
11448
               Error_Pragma_Arg
11449
                 ("pragma% takes two arguments", Task_Type);
11450
            else
11451
               Check_Arg_Is_Static_Expression (Top_Guard, Any_Integer);
11452
            end if;
11453
 
11454
            Check_First_Subtype (Task_Type);
11455
 
11456
            if Rep_Item_Too_Late (Ent, N) then
11457
               raise Pragma_Exit;
11458
            end if;
11459
         end Task_Storage;
11460
 
11461
         --------------------------
11462
         -- Thread_Local_Storage --
11463
         --------------------------
11464
 
11465
         --  pragma Thread_Local_Storage ([Entity =>] LOCAL_NAME);
11466
 
11467
         when Pragma_Thread_Local_Storage => Thread_Local_Storage : declare
11468
            Id : Node_Id;
11469
            E  : Entity_Id;
11470
 
11471
         begin
11472
            GNAT_Pragma;
11473
            Check_Arg_Count (1);
11474
            Check_Optional_Identifier (Arg1, Name_Entity);
11475
            Check_Arg_Is_Library_Level_Local_Name (Arg1);
11476
 
11477
            Id := Expression (Arg1);
11478
            Analyze (Id);
11479
 
11480
            if not Is_Entity_Name (Id)
11481
              or else Ekind (Entity (Id)) /= E_Variable
11482
            then
11483
               Error_Pragma_Arg ("local variable name required", Arg1);
11484
            end if;
11485
 
11486
            E := Entity (Id);
11487
 
11488
            if Rep_Item_Too_Early (E, N)
11489
              or else Rep_Item_Too_Late (E, N)
11490
            then
11491
               raise Pragma_Exit;
11492
            end if;
11493
 
11494
            Set_Has_Pragma_Thread_Local_Storage (E);
11495
            Set_Has_Gigi_Rep_Item (E);
11496
         end Thread_Local_Storage;
11497
 
11498
         ----------------
11499
         -- Time_Slice --
11500
         ----------------
11501
 
11502
         --  pragma Time_Slice (static_duration_EXPRESSION);
11503
 
11504
         when Pragma_Time_Slice => Time_Slice : declare
11505
            Val : Ureal;
11506
            Nod : Node_Id;
11507
 
11508
         begin
11509
            GNAT_Pragma;
11510
            Check_Arg_Count (1);
11511
            Check_No_Identifiers;
11512
            Check_In_Main_Program;
11513
            Check_Arg_Is_Static_Expression (Arg1, Standard_Duration);
11514
 
11515
            if not Error_Posted (Arg1) then
11516
               Nod := Next (N);
11517
               while Present (Nod) loop
11518
                  if Nkind (Nod) = N_Pragma
11519
                    and then Pragma_Name (Nod) = Name_Time_Slice
11520
                  then
11521
                     Error_Msg_Name_1 := Pname;
11522
                     Error_Msg_N ("duplicate pragma% not permitted", Nod);
11523
                  end if;
11524
 
11525
                  Next (Nod);
11526
               end loop;
11527
            end if;
11528
 
11529
            --  Process only if in main unit
11530
 
11531
            if Get_Source_Unit (Loc) = Main_Unit then
11532
               Opt.Time_Slice_Set := True;
11533
               Val := Expr_Value_R (Expression (Arg1));
11534
 
11535
               if Val <= Ureal_0 then
11536
                  Opt.Time_Slice_Value := 0;
11537
 
11538
               elsif Val > UR_From_Uint (UI_From_Int (1000)) then
11539
                  Opt.Time_Slice_Value := 1_000_000_000;
11540
 
11541
               else
11542
                  Opt.Time_Slice_Value :=
11543
                    UI_To_Int (UR_To_Uint (Val * UI_From_Int (1_000_000)));
11544
               end if;
11545
            end if;
11546
         end Time_Slice;
11547
 
11548
         -----------
11549
         -- Title --
11550
         -----------
11551
 
11552
         --  pragma Title (TITLING_OPTION [, TITLING OPTION]);
11553
 
11554
         --   TITLING_OPTION ::=
11555
         --     [Title =>] STRING_LITERAL
11556
         --   | [Subtitle =>] STRING_LITERAL
11557
 
11558
         when Pragma_Title => Title : declare
11559
            Args  : Args_List (1 .. 2);
11560
            Names : constant Name_List (1 .. 2) := (
11561
                      Name_Title,
11562
                      Name_Subtitle);
11563
 
11564
         begin
11565
            GNAT_Pragma;
11566
            Gather_Associations (Names, Args);
11567
 
11568
            for J in 1 .. 2 loop
11569
               if Present (Args (J)) then
11570
                  Check_Arg_Is_String_Literal (Args (J));
11571
               end if;
11572
            end loop;
11573
         end Title;
11574
 
11575
         ---------------------
11576
         -- Unchecked_Union --
11577
         ---------------------
11578
 
11579
         --  pragma Unchecked_Union (first_subtype_LOCAL_NAME)
11580
 
11581
         when Pragma_Unchecked_Union => Unchecked_Union : declare
11582
            Assoc   : constant Node_Id := Arg1;
11583
            Type_Id : constant Node_Id := Expression (Assoc);
11584
            Typ     : Entity_Id;
11585
            Discr   : Entity_Id;
11586
            Tdef    : Node_Id;
11587
            Clist   : Node_Id;
11588
            Vpart   : Node_Id;
11589
            Comp    : Node_Id;
11590
            Variant : Node_Id;
11591
 
11592
         begin
11593
            Ada_2005_Pragma;
11594
            Check_No_Identifiers;
11595
            Check_Arg_Count (1);
11596
            Check_Arg_Is_Local_Name (Arg1);
11597
 
11598
            Find_Type (Type_Id);
11599
            Typ := Entity (Type_Id);
11600
 
11601
            if Typ = Any_Type
11602
              or else Rep_Item_Too_Early (Typ, N)
11603
            then
11604
               return;
11605
            else
11606
               Typ := Underlying_Type (Typ);
11607
            end if;
11608
 
11609
            if Rep_Item_Too_Late (Typ, N) then
11610
               return;
11611
            end if;
11612
 
11613
            Check_First_Subtype (Arg1);
11614
 
11615
            --  Note remaining cases are references to a type in the current
11616
            --  declarative part. If we find an error, we post the error on
11617
            --  the relevant type declaration at an appropriate point.
11618
 
11619
            if not Is_Record_Type (Typ) then
11620
               Error_Msg_N ("Unchecked_Union must be record type", Typ);
11621
               return;
11622
 
11623
            elsif Is_Tagged_Type (Typ) then
11624
               Error_Msg_N ("Unchecked_Union must not be tagged", Typ);
11625
               return;
11626
 
11627
            elsif Is_Limited_Type (Typ) then
11628
               Error_Msg_N
11629
                 ("Unchecked_Union must not be limited record type", Typ);
11630
               Explain_Limited_Type (Typ, Typ);
11631
               return;
11632
 
11633
            else
11634
               if not Has_Discriminants (Typ) then
11635
                  Error_Msg_N
11636
                    ("Unchecked_Union must have one discriminant", Typ);
11637
                  return;
11638
               end if;
11639
 
11640
               Discr := First_Discriminant (Typ);
11641
               while Present (Discr) loop
11642
                  if No (Discriminant_Default_Value (Discr)) then
11643
                     Error_Msg_N
11644
                       ("Unchecked_Union discriminant must have default value",
11645
                        Discr);
11646
                  end if;
11647
                  Next_Discriminant (Discr);
11648
               end loop;
11649
 
11650
               Tdef  := Type_Definition (Declaration_Node (Typ));
11651
               Clist := Component_List (Tdef);
11652
 
11653
               Comp := First (Component_Items (Clist));
11654
               while Present (Comp) loop
11655
                  Check_Component (Comp);
11656
                  Next (Comp);
11657
               end loop;
11658
 
11659
               if No (Clist) or else No (Variant_Part (Clist)) then
11660
                  Error_Msg_N
11661
                    ("Unchecked_Union must have variant part",
11662
                     Tdef);
11663
                  return;
11664
               end if;
11665
 
11666
               Vpart := Variant_Part (Clist);
11667
 
11668
               Variant := First (Variants (Vpart));
11669
               while Present (Variant) loop
11670
                  Check_Variant (Variant);
11671
                  Next (Variant);
11672
               end loop;
11673
            end if;
11674
 
11675
            Set_Is_Unchecked_Union  (Typ, True);
11676
            Set_Convention          (Typ, Convention_C);
11677
 
11678
            Set_Has_Unchecked_Union (Base_Type (Typ), True);
11679
            Set_Is_Unchecked_Union  (Base_Type (Typ), True);
11680
         end Unchecked_Union;
11681
 
11682
         ------------------------
11683
         -- Unimplemented_Unit --
11684
         ------------------------
11685
 
11686
         --  pragma Unimplemented_Unit;
11687
 
11688
         --  Note: this only gives an error if we are generating code, or if
11689
         --  we are in a generic library unit (where the pragma appears in the
11690
         --  body, not in the spec).
11691
 
11692
         when Pragma_Unimplemented_Unit => Unimplemented_Unit : declare
11693
            Cunitent : constant Entity_Id :=
11694
                         Cunit_Entity (Get_Source_Unit (Loc));
11695
            Ent_Kind : constant Entity_Kind :=
11696
                         Ekind (Cunitent);
11697
 
11698
         begin
11699
            GNAT_Pragma;
11700
            Check_Arg_Count (0);
11701
 
11702
            if Operating_Mode = Generate_Code
11703
              or else Ent_Kind = E_Generic_Function
11704
              or else Ent_Kind = E_Generic_Procedure
11705
              or else Ent_Kind = E_Generic_Package
11706
            then
11707
               Get_Name_String (Chars (Cunitent));
11708
               Set_Casing (Mixed_Case);
11709
               Write_Str (Name_Buffer (1 .. Name_Len));
11710
               Write_Str (" is not supported in this configuration");
11711
               Write_Eol;
11712
               raise Unrecoverable_Error;
11713
            end if;
11714
         end Unimplemented_Unit;
11715
 
11716
         ------------------------
11717
         -- Universal_Aliasing --
11718
         ------------------------
11719
 
11720
         --  pragma Universal_Aliasing [([Entity =>] type_LOCAL_NAME)];
11721
 
11722
         when Pragma_Universal_Aliasing => Universal_Alias : declare
11723
            E_Id : Entity_Id;
11724
 
11725
         begin
11726
            GNAT_Pragma;
11727
            Check_Arg_Count (1);
11728
            Check_Optional_Identifier (Arg2, Name_Entity);
11729
            Check_Arg_Is_Local_Name (Arg1);
11730
            E_Id := Entity (Expression (Arg1));
11731
 
11732
            if E_Id = Any_Type then
11733
               return;
11734
            elsif No (E_Id) or else not Is_Type (E_Id) then
11735
               Error_Pragma_Arg ("pragma% requires type", Arg1);
11736
            end if;
11737
 
11738
            Set_Universal_Aliasing (Implementation_Base_Type (E_Id));
11739
         end Universal_Alias;
11740
 
11741
         --------------------
11742
         -- Universal_Data --
11743
         --------------------
11744
 
11745
         --  pragma Universal_Data [(library_unit_NAME)];
11746
 
11747
         when Pragma_Universal_Data =>
11748
            GNAT_Pragma;
11749
 
11750
            --  If this is a configuration pragma, then set the universal
11751
            --  addressing option, otherwise confirm that the pragma satisfies
11752
            --  the requirements of library unit pragma placement and leave it
11753
            --  to the GNAAMP back end to detect the pragma (avoids transitive
11754
            --  setting of the option due to withed units).
11755
 
11756
            if Is_Configuration_Pragma then
11757
               Universal_Addressing_On_AAMP := True;
11758
            else
11759
               Check_Valid_Library_Unit_Pragma;
11760
            end if;
11761
 
11762
            if not AAMP_On_Target then
11763
               Error_Pragma ("?pragma% ignored (applies only to AAMP)");
11764
            end if;
11765
 
11766
         ----------------
11767
         -- Unmodified --
11768
         ----------------
11769
 
11770
         --  pragma Unmodified (local_Name {, local_Name});
11771
 
11772
         when Pragma_Unmodified => Unmodified : declare
11773
            Arg_Node : Node_Id;
11774
            Arg_Expr : Node_Id;
11775
            Arg_Ent  : Entity_Id;
11776
 
11777
         begin
11778
            GNAT_Pragma;
11779
            Check_At_Least_N_Arguments (1);
11780
 
11781
            --  Loop through arguments
11782
 
11783
            Arg_Node := Arg1;
11784
            while Present (Arg_Node) loop
11785
               Check_No_Identifier (Arg_Node);
11786
 
11787
               --  Note: the analyze call done by Check_Arg_Is_Local_Name will
11788
               --  in fact generate reference, so that the entity will have a
11789
               --  reference, which will inhibit any warnings about it not
11790
               --  being referenced, and also properly show up in the ali file
11791
               --  as a reference. But this reference is recorded before the
11792
               --  Has_Pragma_Unreferenced flag is set, so that no warning is
11793
               --  generated for this reference.
11794
 
11795
               Check_Arg_Is_Local_Name (Arg_Node);
11796
               Arg_Expr := Get_Pragma_Arg (Arg_Node);
11797
 
11798
               if Is_Entity_Name (Arg_Expr) then
11799
                  Arg_Ent := Entity (Arg_Expr);
11800
 
11801
                  if not Is_Assignable (Arg_Ent) then
11802
                     Error_Pragma_Arg
11803
                       ("pragma% can only be applied to a variable",
11804
                        Arg_Expr);
11805
                  else
11806
                     Set_Has_Pragma_Unmodified (Arg_Ent);
11807
                  end if;
11808
               end if;
11809
 
11810
               Next (Arg_Node);
11811
            end loop;
11812
         end Unmodified;
11813
 
11814
         ------------------
11815
         -- Unreferenced --
11816
         ------------------
11817
 
11818
         --  pragma Unreferenced (local_Name {, local_Name});
11819
 
11820
         --    or when used in a context clause:
11821
 
11822
         --  pragma Unreferenced (library_unit_NAME {, library_unit_NAME}
11823
 
11824
         when Pragma_Unreferenced => Unreferenced : declare
11825
            Arg_Node : Node_Id;
11826
            Arg_Expr : Node_Id;
11827
            Arg_Ent  : Entity_Id;
11828
            Citem    : Node_Id;
11829
 
11830
         begin
11831
            GNAT_Pragma;
11832
            Check_At_Least_N_Arguments (1);
11833
 
11834
            --  Check case of appearing within context clause
11835
 
11836
            if Is_In_Context_Clause then
11837
 
11838
               --  The arguments must all be units mentioned in a with clause
11839
               --  in the same context clause. Note we already checked (in
11840
               --  Par.Prag) that the arguments are either identifiers or
11841
               --  selected components.
11842
 
11843
               Arg_Node := Arg1;
11844
               while Present (Arg_Node) loop
11845
                  Citem := First (List_Containing (N));
11846
                  while Citem /= N loop
11847
                     if Nkind (Citem) = N_With_Clause
11848
                       and then Same_Name (Name (Citem), Expression (Arg_Node))
11849
                     then
11850
                        Set_Has_Pragma_Unreferenced
11851
                          (Cunit_Entity
11852
                             (Get_Source_Unit
11853
                                (Library_Unit (Citem))));
11854
                        Set_Unit_Name (Expression (Arg_Node), Name (Citem));
11855
                        exit;
11856
                     end if;
11857
 
11858
                     Next (Citem);
11859
                  end loop;
11860
 
11861
                  if Citem = N then
11862
                     Error_Pragma_Arg
11863
                       ("argument of pragma% is not with'ed unit", Arg_Node);
11864
                  end if;
11865
 
11866
                  Next (Arg_Node);
11867
               end loop;
11868
 
11869
            --  Case of not in list of context items
11870
 
11871
            else
11872
               Arg_Node := Arg1;
11873
               while Present (Arg_Node) loop
11874
                  Check_No_Identifier (Arg_Node);
11875
 
11876
                  --  Note: the analyze call done by Check_Arg_Is_Local_Name
11877
                  --  will in fact generate reference, so that the entity will
11878
                  --  have a reference, which will inhibit any warnings about
11879
                  --  it not being referenced, and also properly show up in the
11880
                  --  ali file as a reference. But this reference is recorded
11881
                  --  before the Has_Pragma_Unreferenced flag is set, so that
11882
                  --  no warning is generated for this reference.
11883
 
11884
                  Check_Arg_Is_Local_Name (Arg_Node);
11885
                  Arg_Expr := Get_Pragma_Arg (Arg_Node);
11886
 
11887
                  if Is_Entity_Name (Arg_Expr) then
11888
                     Arg_Ent := Entity (Arg_Expr);
11889
 
11890
                     --  If the entity is overloaded, the pragma applies to the
11891
                     --  most recent overloading, as documented. In this case,
11892
                     --  name resolution does not generate a reference, so it
11893
                     --  must be done here explicitly.
11894
 
11895
                     if Is_Overloaded (Arg_Expr) then
11896
                        Generate_Reference (Arg_Ent, N);
11897
                     end if;
11898
 
11899
                     Set_Has_Pragma_Unreferenced (Arg_Ent);
11900
                  end if;
11901
 
11902
                  Next (Arg_Node);
11903
               end loop;
11904
            end if;
11905
         end Unreferenced;
11906
 
11907
         --------------------------
11908
         -- Unreferenced_Objects --
11909
         --------------------------
11910
 
11911
         --  pragma Unreferenced_Objects (local_Name {, local_Name});
11912
 
11913
         when Pragma_Unreferenced_Objects => Unreferenced_Objects : declare
11914
            Arg_Node : Node_Id;
11915
            Arg_Expr : Node_Id;
11916
 
11917
         begin
11918
            GNAT_Pragma;
11919
            Check_At_Least_N_Arguments (1);
11920
 
11921
            Arg_Node := Arg1;
11922
            while Present (Arg_Node) loop
11923
               Check_No_Identifier (Arg_Node);
11924
               Check_Arg_Is_Local_Name (Arg_Node);
11925
               Arg_Expr := Get_Pragma_Arg (Arg_Node);
11926
 
11927
               if not Is_Entity_Name (Arg_Expr)
11928
                 or else not Is_Type (Entity (Arg_Expr))
11929
               then
11930
                  Error_Pragma_Arg
11931
                    ("argument for pragma% must be type or subtype", Arg_Node);
11932
               end if;
11933
 
11934
               Set_Has_Pragma_Unreferenced_Objects (Entity (Arg_Expr));
11935
               Next (Arg_Node);
11936
            end loop;
11937
         end Unreferenced_Objects;
11938
 
11939
         ------------------------------
11940
         -- Unreserve_All_Interrupts --
11941
         ------------------------------
11942
 
11943
         --  pragma Unreserve_All_Interrupts;
11944
 
11945
         when Pragma_Unreserve_All_Interrupts =>
11946
            GNAT_Pragma;
11947
            Check_Arg_Count (0);
11948
 
11949
            if In_Extended_Main_Code_Unit (Main_Unit_Entity) then
11950
               Unreserve_All_Interrupts := True;
11951
            end if;
11952
 
11953
         ----------------
11954
         -- Unsuppress --
11955
         ----------------
11956
 
11957
         --  pragma Unsuppress (IDENTIFIER [, [On =>] NAME]);
11958
 
11959
         when Pragma_Unsuppress =>
11960
            Ada_2005_Pragma;
11961
            Process_Suppress_Unsuppress (False);
11962
 
11963
         -------------------
11964
         -- Use_VADS_Size --
11965
         -------------------
11966
 
11967
         --  pragma Use_VADS_Size;
11968
 
11969
         when Pragma_Use_VADS_Size =>
11970
            GNAT_Pragma;
11971
            Check_Arg_Count (0);
11972
            Check_Valid_Configuration_Pragma;
11973
            Use_VADS_Size := True;
11974
 
11975
         ---------------------
11976
         -- Validity_Checks --
11977
         ---------------------
11978
 
11979
         --  pragma Validity_Checks (On | Off | ALL_CHECKS | STRING_LITERAL);
11980
 
11981
         when Pragma_Validity_Checks => Validity_Checks : declare
11982
            A  : constant Node_Id   := Expression (Arg1);
11983
            S  : String_Id;
11984
            C  : Char_Code;
11985
 
11986
         begin
11987
            GNAT_Pragma;
11988
            Check_Arg_Count (1);
11989
            Check_No_Identifiers;
11990
 
11991
            if Nkind (A) = N_String_Literal then
11992
               S   := Strval (A);
11993
 
11994
               declare
11995
                  Slen    : constant Natural := Natural (String_Length (S));
11996
                  Options : String (1 .. Slen);
11997
                  J       : Natural;
11998
 
11999
               begin
12000
                  J := 1;
12001
                  loop
12002
                     C := Get_String_Char (S, Int (J));
12003
                     exit when not In_Character_Range (C);
12004
                     Options (J) := Get_Character (C);
12005
 
12006
                     if J = Slen then
12007
                        Set_Validity_Check_Options (Options);
12008
                        exit;
12009
                     else
12010
                        J := J + 1;
12011
                     end if;
12012
                  end loop;
12013
               end;
12014
 
12015
            elsif Nkind (A) = N_Identifier then
12016
 
12017
               if Chars (A) = Name_All_Checks then
12018
                  Set_Validity_Check_Options ("a");
12019
 
12020
               elsif Chars (A) = Name_On then
12021
                  Validity_Checks_On := True;
12022
 
12023
               elsif Chars (A) = Name_Off then
12024
                  Validity_Checks_On := False;
12025
 
12026
               end if;
12027
            end if;
12028
         end Validity_Checks;
12029
 
12030
         --------------
12031
         -- Volatile --
12032
         --------------
12033
 
12034
         --  pragma Volatile (LOCAL_NAME);
12035
 
12036
         when Pragma_Volatile =>
12037
            Process_Atomic_Shared_Volatile;
12038
 
12039
         -------------------------
12040
         -- Volatile_Components --
12041
         -------------------------
12042
 
12043
         --  pragma Volatile_Components (array_LOCAL_NAME);
12044
 
12045
         --  Volatile is handled by the same circuit as Atomic_Components
12046
 
12047
         --------------
12048
         -- Warnings --
12049
         --------------
12050
 
12051
         --  pragma Warnings (On | Off);
12052
         --  pragma Warnings (On | Off, LOCAL_NAME);
12053
         --  pragma Warnings (static_string_EXPRESSION);
12054
         --  pragma Warnings (On | Off, STRING_LITERAL);
12055
 
12056
         when Pragma_Warnings => Warnings : begin
12057
            GNAT_Pragma;
12058
            Check_At_Least_N_Arguments (1);
12059
            Check_No_Identifiers;
12060
 
12061
            --  If debug flag -gnatd.i is set, pragma is ignored
12062
 
12063
            if Debug_Flag_Dot_I then
12064
               return;
12065
            end if;
12066
 
12067
            --  Process various forms of the pragma
12068
 
12069
            declare
12070
               Argx : constant Node_Id := Get_Pragma_Arg (Arg1);
12071
 
12072
            begin
12073
               --  One argument case
12074
 
12075
               if Arg_Count = 1 then
12076
 
12077
                  --  On/Off one argument case was processed by parser
12078
 
12079
                  if Nkind (Argx) = N_Identifier
12080
                    and then
12081
                      (Chars (Argx) = Name_On
12082
                         or else
12083
                       Chars (Argx) = Name_Off)
12084
                  then
12085
                     null;
12086
 
12087
                  --  One argument case must be ON/OFF or static string expr
12088
 
12089
                  elsif not Is_Static_String_Expression (Arg1) then
12090
                     Error_Pragma_Arg
12091
                       ("argument of pragma% must be On/Off or " &
12092
                        "static string expression", Arg2);
12093
 
12094
                  --  One argument string expression case
12095
 
12096
                  else
12097
                     declare
12098
                        Lit : constant Node_Id   := Expr_Value_S (Argx);
12099
                        Str : constant String_Id := Strval (Lit);
12100
                        Len : constant Nat       := String_Length (Str);
12101
                        C   : Char_Code;
12102
                        J   : Nat;
12103
                        OK  : Boolean;
12104
                        Chr : Character;
12105
 
12106
                     begin
12107
                        J := 1;
12108
                        while J <= Len loop
12109
                           C := Get_String_Char (Str, J);
12110
                           OK := In_Character_Range (C);
12111
 
12112
                           if OK then
12113
                              Chr := Get_Character (C);
12114
 
12115
                              --  Dot case
12116
 
12117
                              if J < Len and then Chr = '.' then
12118
                                 J := J + 1;
12119
                                 C := Get_String_Char (Str, J);
12120
                                 Chr := Get_Character (C);
12121
 
12122
                                 if not Set_Dot_Warning_Switch (Chr) then
12123
                                    Error_Pragma_Arg
12124
                                      ("invalid warning switch character " &
12125
                                       '.' & Chr, Arg1);
12126
                                 end if;
12127
 
12128
                              --  Non-Dot case
12129
 
12130
                              else
12131
                                 OK := Set_Warning_Switch (Chr);
12132
                              end if;
12133
                           end if;
12134
 
12135
                           if not OK then
12136
                              Error_Pragma_Arg
12137
                                ("invalid warning switch character " & Chr,
12138
                                 Arg1);
12139
                           end if;
12140
 
12141
                           J := J + 1;
12142
                        end loop;
12143
                     end;
12144
                  end if;
12145
 
12146
                  --  Two or more arguments (must be two)
12147
 
12148
               else
12149
                  Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
12150
                  Check_At_Most_N_Arguments (2);
12151
 
12152
                  declare
12153
                     E_Id : Node_Id;
12154
                     E    : Entity_Id;
12155
                     Err  : Boolean;
12156
 
12157
                  begin
12158
                     E_Id := Expression (Arg2);
12159
                     Analyze (E_Id);
12160
 
12161
                     --  In the expansion of an inlined body, a reference to
12162
                     --  the formal may be wrapped in a conversion if the
12163
                     --  actual is a conversion. Retrieve the real entity name.
12164
 
12165
                     if (In_Instance_Body
12166
                         or else In_Inlined_Body)
12167
                       and then Nkind (E_Id) = N_Unchecked_Type_Conversion
12168
                     then
12169
                        E_Id := Expression (E_Id);
12170
                     end if;
12171
 
12172
                     --  Entity name case
12173
 
12174
                     if Is_Entity_Name (E_Id) then
12175
                        E := Entity (E_Id);
12176
 
12177
                        if E = Any_Id then
12178
                           return;
12179
                        else
12180
                           loop
12181
                              Set_Warnings_Off
12182
                                (E, (Chars (Expression (Arg1)) = Name_Off));
12183
 
12184
                              if Chars (Expression (Arg1)) = Name_Off
12185
                                and then Warn_On_Warnings_Off
12186
                              then
12187
                                 Warnings_Off_Pragmas.Append ((N, E));
12188
                              end if;
12189
 
12190
                              if Is_Enumeration_Type (E) then
12191
                                 declare
12192
                                    Lit : Entity_Id;
12193
                                 begin
12194
                                    Lit := First_Literal (E);
12195
                                    while Present (Lit) loop
12196
                                       Set_Warnings_Off (Lit);
12197
                                       Next_Literal (Lit);
12198
                                    end loop;
12199
                                 end;
12200
                              end if;
12201
 
12202
                              exit when No (Homonym (E));
12203
                              E := Homonym (E);
12204
                           end loop;
12205
                        end if;
12206
 
12207
                     --  Error if not entity or static string literal case
12208
 
12209
                     elsif not Is_Static_String_Expression (Arg2) then
12210
                        Error_Pragma_Arg
12211
                          ("second argument of pragma% must be entity " &
12212
                           "name or static string expression", Arg2);
12213
 
12214
                     --  String literal case
12215
 
12216
                     else
12217
                        String_To_Name_Buffer
12218
                          (Strval (Expr_Value_S (Expression (Arg2))));
12219
 
12220
                        --  Note on configuration pragma case: If this is a
12221
                        --  configuration pragma, then for an OFF pragma, we
12222
                        --  just set Config True in the call, which is all
12223
                        --  that needs to be done. For the case of ON, this
12224
                        --  is normally an error, unless it is canceling the
12225
                        --  effect of a previous OFF pragma in the same file.
12226
                        --  In any other case, an error will be signalled (ON
12227
                        --  with no matching OFF).
12228
 
12229
                        if Chars (Argx) = Name_Off then
12230
                           Set_Specific_Warning_Off
12231
                             (Loc, Name_Buffer (1 .. Name_Len),
12232
                              Config => Is_Configuration_Pragma);
12233
 
12234
                        elsif Chars (Argx) = Name_On then
12235
                           Set_Specific_Warning_On
12236
                             (Loc, Name_Buffer (1 .. Name_Len), Err);
12237
 
12238
                           if Err then
12239
                              Error_Msg
12240
                                ("?pragma Warnings On with no " &
12241
                                 "matching Warnings Off",
12242
                                 Loc);
12243
                           end if;
12244
                        end if;
12245
                     end if;
12246
                  end;
12247
               end if;
12248
            end;
12249
         end Warnings;
12250
 
12251
         -------------------
12252
         -- Weak_External --
12253
         -------------------
12254
 
12255
         --  pragma Weak_External ([Entity =>] LOCAL_NAME);
12256
 
12257
         when Pragma_Weak_External => Weak_External : declare
12258
            Ent : Entity_Id;
12259
 
12260
         begin
12261
            GNAT_Pragma;
12262
            Check_Arg_Count (1);
12263
            Check_Optional_Identifier (Arg1, Name_Entity);
12264
            Check_Arg_Is_Library_Level_Local_Name (Arg1);
12265
            Ent := Entity (Expression (Arg1));
12266
 
12267
            if Rep_Item_Too_Early (Ent, N) then
12268
               return;
12269
            else
12270
               Ent := Underlying_Type (Ent);
12271
            end if;
12272
 
12273
            --  The only processing required is to link this item on to the
12274
            --  list of rep items for the given entity. This is accomplished
12275
            --  by the call to Rep_Item_Too_Late (when no error is detected
12276
            --  and False is returned).
12277
 
12278
            if Rep_Item_Too_Late (Ent, N) then
12279
               return;
12280
            else
12281
               Set_Has_Gigi_Rep_Item (Ent);
12282
            end if;
12283
         end Weak_External;
12284
 
12285
         -----------------------------
12286
         -- Wide_Character_Encoding --
12287
         -----------------------------
12288
 
12289
         --  pragma Wide_Character_Encoding (IDENTIFIER);
12290
 
12291
         when Pragma_Wide_Character_Encoding =>
12292
            GNAT_Pragma;
12293
 
12294
            --  Nothing to do, handled in parser. Note that we do not enforce
12295
            --  configuration pragma placement, this pragma can appear at any
12296
            --  place in the source, allowing mixed encodings within a single
12297
            --  source program.
12298
 
12299
            null;
12300
 
12301
         --------------------
12302
         -- Unknown_Pragma --
12303
         --------------------
12304
 
12305
         --  Should be impossible, since the case of an unknown pragma is
12306
         --  separately processed before the case statement is entered.
12307
 
12308
         when Unknown_Pragma =>
12309
            raise Program_Error;
12310
      end case;
12311
 
12312
   exception
12313
      when Pragma_Exit => null;
12314
   end Analyze_Pragma;
12315
 
12316
   -------------------
12317
   -- Check_Enabled --
12318
   -------------------
12319
 
12320
   function Check_Enabled (Nam : Name_Id) return Boolean is
12321
      PP : Node_Id;
12322
 
12323
   begin
12324
      PP := Opt.Check_Policy_List;
12325
      loop
12326
         if No (PP) then
12327
            return Assertions_Enabled;
12328
 
12329
         elsif
12330
           Nam = Chars (Expression (First (Pragma_Argument_Associations (PP))))
12331
         then
12332
            case
12333
              Chars (Expression (Last (Pragma_Argument_Associations (PP))))
12334
            is
12335
            when Name_On | Name_Check =>
12336
               return True;
12337
            when Name_Off | Name_Ignore =>
12338
               return False;
12339
            when others =>
12340
               raise Program_Error;
12341
            end case;
12342
 
12343
         else
12344
            PP := Next_Pragma (PP);
12345
         end if;
12346
      end loop;
12347
   end Check_Enabled;
12348
 
12349
   ---------------------------------
12350
   -- Delay_Config_Pragma_Analyze --
12351
   ---------------------------------
12352
 
12353
   function Delay_Config_Pragma_Analyze (N : Node_Id) return Boolean is
12354
   begin
12355
      return Pragma_Name (N) = Name_Interrupt_State
12356
               or else
12357
             Pragma_Name (N) = Name_Priority_Specific_Dispatching;
12358
   end Delay_Config_Pragma_Analyze;
12359
 
12360
   -------------------------
12361
   -- Get_Base_Subprogram --
12362
   -------------------------
12363
 
12364
   function Get_Base_Subprogram (Def_Id : Entity_Id) return Entity_Id is
12365
      Result : Entity_Id;
12366
 
12367
   begin
12368
      --  Follow subprogram renaming chain
12369
 
12370
      Result := Def_Id;
12371
      while Is_Subprogram (Result)
12372
        and then
12373
          (Is_Generic_Instance (Result)
12374
            or else Nkind (Parent (Declaration_Node (Result))) =
12375
                                         N_Subprogram_Renaming_Declaration)
12376
        and then Present (Alias (Result))
12377
      loop
12378
         Result := Alias (Result);
12379
      end loop;
12380
 
12381
      return Result;
12382
   end Get_Base_Subprogram;
12383
 
12384
   --------------------
12385
   -- Get_Pragma_Arg --
12386
   --------------------
12387
 
12388
   function Get_Pragma_Arg (Arg : Node_Id) return Node_Id is
12389
   begin
12390
      if Nkind (Arg) = N_Pragma_Argument_Association then
12391
         return Expression (Arg);
12392
      else
12393
         return Arg;
12394
      end if;
12395
   end Get_Pragma_Arg;
12396
 
12397
   ----------------
12398
   -- Initialize --
12399
   ----------------
12400
 
12401
   procedure Initialize is
12402
   begin
12403
      Externals.Init;
12404
   end Initialize;
12405
 
12406
   -----------------------------
12407
   -- Is_Config_Static_String --
12408
   -----------------------------
12409
 
12410
   function Is_Config_Static_String (Arg : Node_Id) return Boolean is
12411
 
12412
      function Add_Config_Static_String (Arg : Node_Id) return Boolean;
12413
      --  This is an internal recursive function that is just like the outer
12414
      --  function except that it adds the string to the name buffer rather
12415
      --  than placing the string in the name buffer.
12416
 
12417
      ------------------------------
12418
      -- Add_Config_Static_String --
12419
      ------------------------------
12420
 
12421
      function Add_Config_Static_String (Arg : Node_Id) return Boolean is
12422
         N : Node_Id;
12423
         C : Char_Code;
12424
 
12425
      begin
12426
         N := Arg;
12427
 
12428
         if Nkind (N) = N_Op_Concat then
12429
            if Add_Config_Static_String (Left_Opnd (N)) then
12430
               N := Right_Opnd (N);
12431
            else
12432
               return False;
12433
            end if;
12434
         end if;
12435
 
12436
         if Nkind (N) /= N_String_Literal then
12437
            Error_Msg_N ("string literal expected for pragma argument", N);
12438
            return False;
12439
 
12440
         else
12441
            for J in 1 .. String_Length (Strval (N)) loop
12442
               C := Get_String_Char (Strval (N), J);
12443
 
12444
               if not In_Character_Range (C) then
12445
                  Error_Msg
12446
                    ("string literal contains invalid wide character",
12447
                     Sloc (N) + 1 + Source_Ptr (J));
12448
                  return False;
12449
               end if;
12450
 
12451
               Add_Char_To_Name_Buffer (Get_Character (C));
12452
            end loop;
12453
         end if;
12454
 
12455
         return True;
12456
      end Add_Config_Static_String;
12457
 
12458
   --  Start of processing for Is_Config_Static_String
12459
 
12460
   begin
12461
 
12462
      Name_Len := 0;
12463
      return Add_Config_Static_String (Arg);
12464
   end Is_Config_Static_String;
12465
 
12466
   -----------------------------------------
12467
   -- Is_Non_Significant_Pragma_Reference --
12468
   -----------------------------------------
12469
 
12470
   --  This function makes use of the following static table which indicates
12471
   --  whether a given pragma is significant.
12472
 
12473
   --  -1  indicates that references in any argument position are significant
12474
   --  0   indicates that appearence in any argument is not significant
12475
   --  +n  indicates that appearence as argument n is significant, but all
12476
   --      other arguments are not significant
12477
   --  99  special processing required (e.g. for pragma Check)
12478
 
12479
   Sig_Flags : constant array (Pragma_Id) of Int :=
12480
     (Pragma_AST_Entry                     => -1,
12481
      Pragma_Abort_Defer                   => -1,
12482
      Pragma_Ada_83                        => -1,
12483
      Pragma_Ada_95                        => -1,
12484
      Pragma_Ada_05                        => -1,
12485
      Pragma_Ada_2005                      => -1,
12486
      Pragma_All_Calls_Remote              => -1,
12487
      Pragma_Annotate                      => -1,
12488
      Pragma_Assert                        => -1,
12489
      Pragma_Assertion_Policy              =>  0,
12490
      Pragma_Assume_No_Invalid_Values      =>  0,
12491
      Pragma_Asynchronous                  => -1,
12492
      Pragma_Atomic                        =>  0,
12493
      Pragma_Atomic_Components             =>  0,
12494
      Pragma_Attach_Handler                => -1,
12495
      Pragma_Check                         => 99,
12496
      Pragma_Check_Name                    =>  0,
12497
      Pragma_Check_Policy                  =>  0,
12498
      Pragma_CIL_Constructor               => -1,
12499
      Pragma_CPP_Class                     =>  0,
12500
      Pragma_CPP_Constructor               =>  0,
12501
      Pragma_CPP_Virtual                   =>  0,
12502
      Pragma_CPP_Vtable                    =>  0,
12503
      Pragma_C_Pass_By_Copy                =>  0,
12504
      Pragma_Comment                       =>  0,
12505
      Pragma_Common_Object                 => -1,
12506
      Pragma_Compile_Time_Error            => -1,
12507
      Pragma_Compile_Time_Warning          => -1,
12508
      Pragma_Compiler_Unit                 =>  0,
12509
      Pragma_Complete_Representation       =>  0,
12510
      Pragma_Complex_Representation        =>  0,
12511
      Pragma_Component_Alignment           => -1,
12512
      Pragma_Controlled                    =>  0,
12513
      Pragma_Convention                    =>  0,
12514
      Pragma_Convention_Identifier         =>  0,
12515
      Pragma_Debug                         => -1,
12516
      Pragma_Debug_Policy                  =>  0,
12517
      Pragma_Detect_Blocking               => -1,
12518
      Pragma_Dimension                     => -1,
12519
      Pragma_Discard_Names                 =>  0,
12520
      Pragma_Elaborate                     => -1,
12521
      Pragma_Elaborate_All                 => -1,
12522
      Pragma_Elaborate_Body                => -1,
12523
      Pragma_Elaboration_Checks            => -1,
12524
      Pragma_Eliminate                     => -1,
12525
      Pragma_Export                        => -1,
12526
      Pragma_Export_Exception              => -1,
12527
      Pragma_Export_Function               => -1,
12528
      Pragma_Export_Object                 => -1,
12529
      Pragma_Export_Procedure              => -1,
12530
      Pragma_Export_Value                  => -1,
12531
      Pragma_Export_Valued_Procedure       => -1,
12532
      Pragma_Extend_System                 => -1,
12533
      Pragma_Extensions_Allowed            => -1,
12534
      Pragma_External                      => -1,
12535
      Pragma_Favor_Top_Level               => -1,
12536
      Pragma_External_Name_Casing          => -1,
12537
      Pragma_Fast_Math                     => -1,
12538
      Pragma_Finalize_Storage_Only         =>  0,
12539
      Pragma_Float_Representation          =>  0,
12540
      Pragma_Ident                         => -1,
12541
      Pragma_Implemented_By_Entry          => -1,
12542
      Pragma_Implicit_Packing              =>  0,
12543
      Pragma_Import                        => +2,
12544
      Pragma_Import_Exception              =>  0,
12545
      Pragma_Import_Function               =>  0,
12546
      Pragma_Import_Object                 =>  0,
12547
      Pragma_Import_Procedure              =>  0,
12548
      Pragma_Import_Valued_Procedure       =>  0,
12549
      Pragma_Initialize_Scalars            => -1,
12550
      Pragma_Inline                        =>  0,
12551
      Pragma_Inline_Always                 =>  0,
12552
      Pragma_Inline_Generic                =>  0,
12553
      Pragma_Inspection_Point              => -1,
12554
      Pragma_Interface                     => +2,
12555
      Pragma_Interface_Name                => +2,
12556
      Pragma_Interrupt_Handler             => -1,
12557
      Pragma_Interrupt_Priority            => -1,
12558
      Pragma_Interrupt_State               => -1,
12559
      Pragma_Java_Constructor              => -1,
12560
      Pragma_Java_Interface                => -1,
12561
      Pragma_Keep_Names                    =>  0,
12562
      Pragma_License                       => -1,
12563
      Pragma_Link_With                     => -1,
12564
      Pragma_Linker_Alias                  => -1,
12565
      Pragma_Linker_Constructor            => -1,
12566
      Pragma_Linker_Destructor             => -1,
12567
      Pragma_Linker_Options                => -1,
12568
      Pragma_Linker_Section                => -1,
12569
      Pragma_List                          => -1,
12570
      Pragma_Locking_Policy                => -1,
12571
      Pragma_Long_Float                    => -1,
12572
      Pragma_Machine_Attribute             => -1,
12573
      Pragma_Main                          => -1,
12574
      Pragma_Main_Storage                  => -1,
12575
      Pragma_Memory_Size                   => -1,
12576
      Pragma_No_Return                     =>  0,
12577
      Pragma_No_Body                       =>  0,
12578
      Pragma_No_Run_Time                   => -1,
12579
      Pragma_No_Strict_Aliasing            => -1,
12580
      Pragma_Normalize_Scalars             => -1,
12581
      Pragma_Obsolescent                   =>  0,
12582
      Pragma_Optimize                      => -1,
12583
      Pragma_Optimize_Alignment            => -1,
12584
      Pragma_Pack                          =>  0,
12585
      Pragma_Page                          => -1,
12586
      Pragma_Passive                       => -1,
12587
      Pragma_Preelaborable_Initialization  => -1,
12588
      Pragma_Polling                       => -1,
12589
      Pragma_Persistent_BSS                =>  0,
12590
      Pragma_Postcondition                 => -1,
12591
      Pragma_Precondition                  => -1,
12592
      Pragma_Preelaborate                  => -1,
12593
      Pragma_Preelaborate_05               => -1,
12594
      Pragma_Priority                      => -1,
12595
      Pragma_Priority_Specific_Dispatching => -1,
12596
      Pragma_Profile                       =>  0,
12597
      Pragma_Profile_Warnings              =>  0,
12598
      Pragma_Propagate_Exceptions          => -1,
12599
      Pragma_Psect_Object                  => -1,
12600
      Pragma_Pure                          => -1,
12601
      Pragma_Pure_05                       => -1,
12602
      Pragma_Pure_Function                 => -1,
12603
      Pragma_Queuing_Policy                => -1,
12604
      Pragma_Ravenscar                     => -1,
12605
      Pragma_Relative_Deadline             => -1,
12606
      Pragma_Remote_Call_Interface         => -1,
12607
      Pragma_Remote_Types                  => -1,
12608
      Pragma_Restricted_Run_Time           => -1,
12609
      Pragma_Restriction_Warnings          => -1,
12610
      Pragma_Restrictions                  => -1,
12611
      Pragma_Reviewable                    => -1,
12612
      Pragma_Short_Circuit_And_Or          => -1,
12613
      Pragma_Share_Generic                 => -1,
12614
      Pragma_Shared                        => -1,
12615
      Pragma_Shared_Passive                => -1,
12616
      Pragma_Source_File_Name              => -1,
12617
      Pragma_Source_File_Name_Project      => -1,
12618
      Pragma_Source_Reference              => -1,
12619
      Pragma_Storage_Size                  => -1,
12620
      Pragma_Storage_Unit                  => -1,
12621
      Pragma_Static_Elaboration_Desired    => -1,
12622
      Pragma_Stream_Convert                => -1,
12623
      Pragma_Style_Checks                  => -1,
12624
      Pragma_Subtitle                      => -1,
12625
      Pragma_Suppress                      =>  0,
12626
      Pragma_Suppress_Exception_Locations  =>  0,
12627
      Pragma_Suppress_All                  => -1,
12628
      Pragma_Suppress_Debug_Info           =>  0,
12629
      Pragma_Suppress_Initialization       =>  0,
12630
      Pragma_System_Name                   => -1,
12631
      Pragma_Task_Dispatching_Policy       => -1,
12632
      Pragma_Task_Info                     => -1,
12633
      Pragma_Task_Name                     => -1,
12634
      Pragma_Task_Storage                  =>  0,
12635
      Pragma_Thread_Local_Storage          =>  0,
12636
      Pragma_Time_Slice                    => -1,
12637
      Pragma_Title                         => -1,
12638
      Pragma_Unchecked_Union               =>  0,
12639
      Pragma_Unimplemented_Unit            => -1,
12640
      Pragma_Universal_Aliasing            => -1,
12641
      Pragma_Universal_Data                => -1,
12642
      Pragma_Unmodified                    => -1,
12643
      Pragma_Unreferenced                  => -1,
12644
      Pragma_Unreferenced_Objects          => -1,
12645
      Pragma_Unreserve_All_Interrupts      => -1,
12646
      Pragma_Unsuppress                    =>  0,
12647
      Pragma_Use_VADS_Size                 => -1,
12648
      Pragma_Validity_Checks               => -1,
12649
      Pragma_Volatile                      =>  0,
12650
      Pragma_Volatile_Components           =>  0,
12651
      Pragma_Warnings                      => -1,
12652
      Pragma_Weak_External                 => -1,
12653
      Pragma_Wide_Character_Encoding       =>  0,
12654
      Unknown_Pragma                       =>  0);
12655
 
12656
   function Is_Non_Significant_Pragma_Reference (N : Node_Id) return Boolean is
12657
      Id : Pragma_Id;
12658
      P  : Node_Id;
12659
      C  : Int;
12660
      A  : Node_Id;
12661
 
12662
   begin
12663
      P := Parent (N);
12664
 
12665
      if Nkind (P) /= N_Pragma_Argument_Association then
12666
         return False;
12667
 
12668
      else
12669
         Id := Get_Pragma_Id (Parent (P));
12670
         C := Sig_Flags (Id);
12671
 
12672
         case C is
12673
            when -1 =>
12674
               return False;
12675
 
12676
            when 0 =>
12677
               return True;
12678
 
12679
            when 99 =>
12680
               case Id is
12681
 
12682
                  --  For pragma Check, the first argument is not significant,
12683
                  --  the second and the third (if present) arguments are
12684
                  --  significant.
12685
 
12686
                  when Pragma_Check =>
12687
                     return
12688
                       P = First (Pragma_Argument_Associations (Parent (P)));
12689
 
12690
                  when others =>
12691
                     raise Program_Error;
12692
               end case;
12693
 
12694
            when others =>
12695
               A := First (Pragma_Argument_Associations (Parent (P)));
12696
               for J in 1 .. C - 1 loop
12697
                  if No (A) then
12698
                     return False;
12699
                  end if;
12700
 
12701
                  Next (A);
12702
               end loop;
12703
 
12704
               return A = P; -- is this wrong way round ???
12705
         end case;
12706
      end if;
12707
   end Is_Non_Significant_Pragma_Reference;
12708
 
12709
   ------------------------------
12710
   -- Is_Pragma_String_Literal --
12711
   ------------------------------
12712
 
12713
   --  This function returns true if the corresponding pragma argument is a
12714
   --  static string expression. These are the only cases in which string
12715
   --  literals can appear as pragma arguments. We also allow a string literal
12716
   --  as the first argument to pragma Assert (although it will of course
12717
   --  always generate a type error).
12718
 
12719
   function Is_Pragma_String_Literal (Par : Node_Id) return Boolean is
12720
      Pragn : constant Node_Id := Parent (Par);
12721
      Assoc : constant List_Id := Pragma_Argument_Associations (Pragn);
12722
      Pname : constant Name_Id := Pragma_Name (Pragn);
12723
      Argn  : Natural;
12724
      N     : Node_Id;
12725
 
12726
   begin
12727
      Argn := 1;
12728
      N := First (Assoc);
12729
      loop
12730
         exit when N = Par;
12731
         Argn := Argn + 1;
12732
         Next (N);
12733
      end loop;
12734
 
12735
      if Pname = Name_Assert then
12736
         return True;
12737
 
12738
      elsif Pname = Name_Export then
12739
         return Argn > 2;
12740
 
12741
      elsif Pname = Name_Ident then
12742
         return Argn = 1;
12743
 
12744
      elsif Pname = Name_Import then
12745
         return Argn > 2;
12746
 
12747
      elsif Pname = Name_Interface_Name then
12748
         return Argn > 1;
12749
 
12750
      elsif Pname = Name_Linker_Alias then
12751
         return Argn = 2;
12752
 
12753
      elsif Pname = Name_Linker_Section then
12754
         return Argn = 2;
12755
 
12756
      elsif Pname = Name_Machine_Attribute then
12757
         return Argn = 2;
12758
 
12759
      elsif Pname = Name_Source_File_Name then
12760
         return True;
12761
 
12762
      elsif Pname = Name_Source_Reference then
12763
         return Argn = 2;
12764
 
12765
      elsif Pname = Name_Title then
12766
         return True;
12767
 
12768
      elsif Pname = Name_Subtitle then
12769
         return True;
12770
 
12771
      else
12772
         return False;
12773
      end if;
12774
   end Is_Pragma_String_Literal;
12775
 
12776
   --------------------------------------
12777
   -- Process_Compilation_Unit_Pragmas --
12778
   --------------------------------------
12779
 
12780
   procedure Process_Compilation_Unit_Pragmas (N : Node_Id) is
12781
   begin
12782
      --  A special check for pragma Suppress_All, a very strange DEC pragma,
12783
      --  strange because it comes at the end of the unit. If we have a pragma
12784
      --  Suppress_All in the Pragmas_After of the current unit, then we insert
12785
      --  a pragma Suppress (All_Checks) at the start of the context clause to
12786
      --  ensure the correct processing.
12787
 
12788
      declare
12789
         PA : constant List_Id := Pragmas_After (Aux_Decls_Node (N));
12790
         P  : Node_Id;
12791
 
12792
      begin
12793
         if Present (PA) then
12794
            P := First (PA);
12795
            while Present (P) loop
12796
               if Pragma_Name (P) = Name_Suppress_All then
12797
                  Prepend_To (Context_Items (N),
12798
                    Make_Pragma (Sloc (P),
12799
                      Chars => Name_Suppress,
12800
                      Pragma_Argument_Associations => New_List (
12801
                        Make_Pragma_Argument_Association (Sloc (P),
12802
                          Expression =>
12803
                            Make_Identifier (Sloc (P),
12804
                              Chars => Name_All_Checks)))));
12805
                  exit;
12806
               end if;
12807
 
12808
               Next (P);
12809
            end loop;
12810
         end if;
12811
      end;
12812
   end Process_Compilation_Unit_Pragmas;
12813
 
12814
   --------
12815
   -- rv --
12816
   --------
12817
 
12818
   procedure rv is
12819
   begin
12820
      null;
12821
   end rv;
12822
 
12823
   --------------------------------
12824
   -- Set_Encoded_Interface_Name --
12825
   --------------------------------
12826
 
12827
   procedure Set_Encoded_Interface_Name (E : Entity_Id; S : Node_Id) is
12828
      Str : constant String_Id := Strval (S);
12829
      Len : constant Int       := String_Length (Str);
12830
      CC  : Char_Code;
12831
      C   : Character;
12832
      J   : Int;
12833
 
12834
      Hex : constant array (0 .. 15) of Character := "0123456789abcdef";
12835
 
12836
      procedure Encode;
12837
      --  Stores encoded value of character code CC. The encoding we use an
12838
      --  underscore followed by four lower case hex digits.
12839
 
12840
      ------------
12841
      -- Encode --
12842
      ------------
12843
 
12844
      procedure Encode is
12845
      begin
12846
         Store_String_Char (Get_Char_Code ('_'));
12847
         Store_String_Char
12848
           (Get_Char_Code (Hex (Integer (CC / 2 ** 12))));
12849
         Store_String_Char
12850
           (Get_Char_Code (Hex (Integer (CC / 2 ** 8 and 16#0F#))));
12851
         Store_String_Char
12852
           (Get_Char_Code (Hex (Integer (CC / 2 ** 4 and 16#0F#))));
12853
         Store_String_Char
12854
           (Get_Char_Code (Hex (Integer (CC and 16#0F#))));
12855
      end Encode;
12856
 
12857
   --  Start of processing for Set_Encoded_Interface_Name
12858
 
12859
   begin
12860
      --  If first character is asterisk, this is a link name, and we leave it
12861
      --  completely unmodified. We also ignore null strings (the latter case
12862
      --  happens only in error cases) and no encoding should occur for Java or
12863
      --  AAMP interface names.
12864
 
12865
      if Len = 0
12866
        or else Get_String_Char (Str, 1) = Get_Char_Code ('*')
12867
        or else VM_Target /= No_VM
12868
        or else AAMP_On_Target
12869
      then
12870
         Set_Interface_Name (E, S);
12871
 
12872
      else
12873
         J := 1;
12874
         loop
12875
            CC := Get_String_Char (Str, J);
12876
 
12877
            exit when not In_Character_Range (CC);
12878
 
12879
            C := Get_Character (CC);
12880
 
12881
            exit when C /= '_' and then C /= '$'
12882
              and then C not in '0' .. '9'
12883
              and then C not in 'a' .. 'z'
12884
              and then C not in 'A' .. 'Z';
12885
 
12886
            if J = Len then
12887
               Set_Interface_Name (E, S);
12888
               return;
12889
 
12890
            else
12891
               J := J + 1;
12892
            end if;
12893
         end loop;
12894
 
12895
         --  Here we need to encode. The encoding we use as follows:
12896
         --     three underscores  + four hex digits (lower case)
12897
 
12898
         Start_String;
12899
 
12900
         for J in 1 .. String_Length (Str) loop
12901
            CC := Get_String_Char (Str, J);
12902
 
12903
            if not In_Character_Range (CC) then
12904
               Encode;
12905
            else
12906
               C := Get_Character (CC);
12907
 
12908
               if C = '_' or else C = '$'
12909
                 or else C in '0' .. '9'
12910
                 or else C in 'a' .. 'z'
12911
                 or else C in 'A' .. 'Z'
12912
               then
12913
                  Store_String_Char (CC);
12914
               else
12915
                  Encode;
12916
               end if;
12917
            end if;
12918
         end loop;
12919
 
12920
         Set_Interface_Name (E,
12921
           Make_String_Literal (Sloc (S),
12922
             Strval => End_String));
12923
      end if;
12924
   end Set_Encoded_Interface_Name;
12925
 
12926
   -------------------
12927
   -- Set_Unit_Name --
12928
   -------------------
12929
 
12930
   procedure Set_Unit_Name (N : Node_Id; With_Item : Node_Id) is
12931
      Pref : Node_Id;
12932
      Scop : Entity_Id;
12933
 
12934
   begin
12935
      if Nkind (N) = N_Identifier
12936
        and then Nkind (With_Item) = N_Identifier
12937
      then
12938
         Set_Entity (N, Entity (With_Item));
12939
 
12940
      elsif Nkind (N) = N_Selected_Component then
12941
         Change_Selected_Component_To_Expanded_Name (N);
12942
         Set_Entity (N, Entity (With_Item));
12943
         Set_Entity (Selector_Name (N), Entity (N));
12944
 
12945
         Pref := Prefix (N);
12946
         Scop := Scope (Entity (N));
12947
         while Nkind (Pref) = N_Selected_Component loop
12948
            Change_Selected_Component_To_Expanded_Name (Pref);
12949
            Set_Entity (Selector_Name (Pref), Scop);
12950
            Set_Entity (Pref, Scop);
12951
            Pref := Prefix (Pref);
12952
            Scop := Scope (Scop);
12953
         end loop;
12954
 
12955
         Set_Entity (Pref, Scop);
12956
      end if;
12957
   end Set_Unit_Name;
12958
 
12959
end Sem_Prag;

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