OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [lib-xref.ads] - Blame information for rev 706

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 706 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                         GNAT COMPILER COMPONENTS                         --
4
--                                                                          --
5
--                             L I B . X R E F                              --
6
--                                                                          --
7
--                                 S p e c                                  --
8
--                                                                          --
9
--          Copyright (C) 1998-2011, 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 package contains for collecting and outputting cross-reference
27
--  information.
28
 
29
with Einfo;    use Einfo;
30
with Lib.Util; use Lib.Util;
31
with Put_Alfa;
32
 
33
package Lib.Xref is
34
 
35
   -------------------------------------------------------
36
   -- Format of Cross-Reference Information in ALI File --
37
   -------------------------------------------------------
38
 
39
   --  Cross-reference sections follow the dependency section (D lines) in
40
   --  an ALI file, so that they need not be read by gnatbind, gnatmake etc.
41
 
42
   --  A cross reference section has a header of the form
43
 
44
   --     X  dependency-number  filename
45
 
46
   --        This header precedes xref information (entities/references from
47
   --        the unit), identified by dependency number and file name. The
48
   --        dependency number is the index into the generated D lines and
49
   --        is ones origin (e.g. 2 = reference to second generated D line).
50
 
51
   --        Note that the filename here will reflect the original name if
52
   --        a Source_Reference pragma was encountered (since all line number
53
   --        references will be with respect to the original file).
54
 
55
   --  The lines following the header look like
56
 
57
   --  line type col level entity renameref instref typeref overref ref ref
58
 
59
   --        line is the line number of the referenced entity. The name of
60
   --        the entity starts in column col. Columns are numbered from one,
61
   --        and if horizontal tab characters are present, the column number
62
   --        is computed assuming standard 1,9,17,.. tab stops. For example,
63
   --        if the entity is the first token on the line, and is preceded
64
   --        by space-HT-space, then the column would be column 10.
65
 
66
   --        type is a single letter identifying the type of the entity. See
67
   --        next section (Cross-Reference Entity Identifiers) for a full list
68
   --        of the characters used).
69
 
70
   --        col is the column number of the referenced entity
71
 
72
   --        level is a single character that separates the col and entity
73
   --        fields. It is an asterisk (*) for a top level library entity that
74
   --        is publicly visible, as well for an entity declared in the visible
75
   --        part of a generic package, the plus sign (+) for a C/C++ static
76
   --        entity, and space otherwise.
77
 
78
   --        entity is the name of the referenced entity, with casing in
79
   --        the canonical casing for the source file where it is defined.
80
 
81
   --        renameref provides information on renaming. If the entity is
82
   --        a package, object or overloadable entity which is declared by
83
   --        a renaming declaration, and the renaming refers to an entity
84
   --        with a simple identifier or expanded name, then renameref has
85
   --        the form:
86
 
87
   --            =line:col
88
 
89
   --        Here line:col give the reference to the identifier that appears
90
   --        in the renaming declaration. Note that we never need a file entry,
91
   --        since this identifier is always in the current file in which the
92
   --        entity is declared. Currently, renameref appears only for the
93
   --        simple renaming case. If the renaming reference is a complex
94
   --        expressions, then renameref is omitted. Here line/col give
95
   --        line/column as defined above.
96
 
97
   --        instref is only present for package and subprogram instances. The
98
   --        information in instref is the location of the point of declaration
99
   --        of the generic parent unit. This part has the form:
100
 
101
   --            [file|line]
102
 
103
   --        without column information, on the reasonable assumption that
104
   --        there is only one unit per line (the same assumption is made in
105
   --        references to entities declared within instances, see below).
106
 
107
   --        typeref is the reference for a related type. This part is
108
   --        optional. It is present for the following cases:
109
 
110
   --          derived types (points to the parent type)   LR=<>
111
   --          access types (points to designated type)    LR=()
112
   --          array types (points to component type)      LR=()
113
   --          subtypes (points to ancestor type)          LR={}
114
   --          functions (points to result type)           LR={}
115
   --          enumeration literals (points to enum type)  LR={}
116
   --          objects and components (points to type)     LR={}
117
 
118
   --          For a type that implements multiple interfaces, there is an
119
   --          entry of the form  LR=<> for each of the interfaces appearing
120
   --          in the type declaration. In the data structures of ali.ads,
121
   --          the type that the entity extends (or the first interface if
122
   --          there is no such type) is stored in Xref_Entity_Record.Tref*,
123
   --          additional interfaces are stored in the list of references
124
   --          with a special type of Interface_Reference.
125
 
126
   --          For an array type, there is an entry of the form LR=<> for each
127
   --          of the index types appearing in the type declaration. The index
128
   --          types follow the entry for the component type. In the data
129
   --          structures of ali.ads, however, the list of index types are
130
   --          output in the list of references with a special Rtype set to
131
   --          Array_Index_Reference.
132
 
133
   --          In the above list LR shows the brackets used in the output which
134
   --          has one of the two following forms:
135
 
136
   --            L file | line type col R      user entity
137
   --            L name-in-lower-case R        standard entity
138
 
139
   --          For the form for a user entity, file is the dependency number
140
   --          of the file containing the declaration of the related type.
141
   --          This number and the following vertical bar are omitted if the
142
   --          relevant type is defined in the same file as the current entity.
143
   --          The line, type, col are defined as previously described, and
144
   --          specify the location of the relevant type declaration in the
145
   --          referenced file. For the standard entity form, the name between
146
   --          the brackets is the normal name of the entity in lower case.
147
 
148
   --        overref is present for overriding operations (procedures and
149
   --        functions), and provides information on the operation that it
150
   --        overrides. This information has the format:
151
 
152
   --        '<' file | line 'o' col '>'
153
 
154
   --           file is the dependency number of the file containing the
155
   --           declaration of the overridden operation. It and the following
156
   --           vertical bar are omitted if the file is the same as that of
157
   --           the overriding operation.
158
 
159
   --     There may be zero or more ref entries on each line
160
 
161
   --        file | line type col [...]
162
 
163
   --           file is the dependency number of the file with the reference.
164
   --           It and the following vertical bar are omitted if the file is
165
   --           the same as the previous ref, and the refs for the current
166
   --           file are first (and do not need a bar).
167
 
168
   --           line is the line number of the reference
169
 
170
   --           col is the column number of the reference, as defined above
171
 
172
   --           type is one of
173
   --              b = body entity
174
   --              c = completion of private or incomplete type
175
   --              d = discriminant of type
176
   --              D = object definition
177
   --              e = end of spec
178
   --              H = abstract type
179
   --              i = implicit reference
180
   --              k = implicit reference to parent unit in child unit
181
   --              l = label on END line
182
   --              m = modification
183
   --              o = own variable reference (SPARK only)
184
   --              p = primitive operation
185
   --              P = overriding primitive operation
186
   --              r = reference
187
   --              R = subprogram reference in dispatching call
188
   --              s = subprogram reference in a static call
189
   --              t = end of body
190
   --              w = WITH line
191
   --              x = type extension
192
   --              z = generic formal parameter
193
   --              > = subprogram IN parameter
194
   --              = = subprogram IN OUT parameter
195
   --              < = subprogram OUT parameter
196
   --              ^ = subprogram ACCESS parameter
197
 
198
   --           b is used for spec entities that are repeated in a body,
199
   --           including the unit (subprogram, package, task, protected body,
200
   --           protected entry) name itself, and in the case of a subprogram,
201
   --           the formals. This letter is also used for the occurrence of
202
   --           entry names in accept statements. Such entities are not
203
   --           considered to be definitions for cross-referencing purposes,
204
   --           but rather are considered to be references to the corresponding
205
   --           spec entities, marked with this special type.
206
 
207
   --           c is similar to b but is used to mark the completion of a
208
   --           private or incomplete type. As with b, the completion is not
209
   --           regarded as a separate definition, but rather a reference to
210
   --           the initial declaration, marked with this special type.
211
 
212
   --           d is used to identify a discriminant of a type. If this is
213
   --           an incomplete or private type with discriminants, the entry
214
   --           denotes the occurrence of the discriminant in the partial view
215
   --           which is also the point of definition of the discriminant. The
216
   --           occurrence of the same discriminant in the full view is a
217
   --           regular reference to it.
218
 
219
   --           e is used to identify the end of a construct in the following
220
   --           cases:
221
 
222
   --             Block Statement        end [block_IDENTIFIER];
223
   --             Loop Statement         end loop [loop_IDENTIFIER];
224
   --             Package Specification  end [[PARENT_UNIT_NAME .] IDENTIFIER];
225
   --             Task Definition        end [task_IDENTIFIER];
226
   --             Protected Definition   end [protected_IDENTIFIER];
227
   --             Record Definition      end record;
228
   --             Enumeration Definition );
229
 
230
   --           Note that 'e' entries are special in that they appear even
231
   --           in referencing units (normally xref entries appear only for
232
   --           references in the extended main source unit (see Lib) to which
233
   --           the ali applies. But 'e' entries are really structural and
234
   --           simply indicate where packages end. This information can be
235
   --           used to reconstruct scope information for any entities
236
   --           referenced from within the package. The line/column values
237
   --           for these entries point to the semicolon ending the construct.
238
 
239
   --           i is used to identify a reference to the entity in a generic
240
   --           actual or in a default in a call. The node that denotes the
241
   --           entity does not come from source, but it has the Sloc of the
242
   --           source node that generates the implicit reference, and it is
243
   --           useful to record this one.
244
 
245
   --           k is another non-standard reference type, used to record a
246
   --           reference from a child unit to its parent. For various cross-
247
   --           referencing tools, we need a pointer from the xref entries for
248
   --           the child to the parent. This is the opposite way round from
249
   --           normal xref entries, since the reference is *from* the child
250
   --           unit *to* the parent unit, yet appears in the xref entries for
251
   --           the child. Consider this example:
252
   --
253
   --             package q is
254
   --             end;
255
   --             package q.r is
256
   --             end q.r;
257
   --
258
   --           The ali file for q-r.ads has these entries
259
   --
260
   --             D q.ads
261
   --             D q-r.ads
262
   --             D system.ads
263
   --             X 1 q.ads
264
   --             1K9*q 2e4 2|1r9 2r5
265
   --             X 2 q-r.ads
266
   --             1K11*r 1|1k9 2|2l7 2e8
267
   --
268
   --           Here the 2|1r9 entry appearing in the section for the parent
269
   --           is the normal reference from the child to the parent. The 1k9
270
   --           entry in the section for the child duplicates this information
271
   --           but appears in the child rather than the parent.
272
 
273
   --           l is used to identify the occurrence in the source of the name
274
   --           on an end line. This is just a syntactic reference which can be
275
   --           ignored for semantic purposes (e.g. a call graph construction).
276
   --           Again, in the case of an accept there can be multiple l lines.
277
 
278
   --           o is used for variables referenced from a SPARK 'own'
279
   --           definition. In the SPARK language, it is allowed to use a
280
   --           variable before its actual declaration.
281
 
282
   --           p is used to mark a primitive operation of the given entity.
283
   --           For example, if we have a type Tx, and a primitive operation
284
   --           Pq of this type, then an entry in the list of references to
285
   --           Tx will point to the declaration of Pq. Note that this entry
286
   --           type is unusual because it an implicit rather than explicit,
287
   --           and the name of the reference does not match the name of the
288
   --           entity for which a reference is generated. These entries are
289
   --           generated only for entities declared in the extended main
290
   --           source unit (main unit itself, its separate spec (if any).
291
   --           and all subunits (considered recursively).
292
 
293
   --           If the primitive operation overrides an inherited primitive
294
   --           operation of the parent type, the letter 'P' is used in the
295
   --           corresponding entry.
296
 
297
   --           R is used to mark a dispatching call. The reference is to
298
   --           the specification of the primitive operation of the root
299
   --           type when the call has a controlling argument in its class.
300
 
301
   --           s is used to mark a static subprogram call. The reference is
302
   --           to the specification of the subprogram being called.
303
 
304
   --           t is similar to e. It identifies the end of a corresponding
305
   --           body (such a reference always links up with a b reference)
306
 
307
   --             Subprogram Body        end [DESIGNATOR];
308
   --             Package Body           end [[PARENT_UNIT_NAME .] IDENTIFIER];
309
   --             Task Body              end [task_IDENTIFIER];
310
   --             Entry Body             end [entry_IDENTIFIER];
311
   --             Protected Body         end [protected_IDENTIFIER]
312
   --             Accept Statement       end [entry_IDENTIFIER]];
313
 
314
   --           Note that in the case of accept statements, there can
315
   --           be multiple b and t entries for the same entity.
316
 
317
   --           x is used to identify the reference as the entity from which a
318
   --           tagged type is extended. This allows immediate access to the
319
   --           parent of a tagged type.
320
 
321
   --           z is used on the cross-reference line for a generic unit,
322
   --           to mark the definition of a generic formal of the unit. This
323
   --           entry type is similar to 'k' and 'p' in that it is an implicit
324
   --           reference for an entity with a different name.
325
 
326
   --           The characters >, <. =, and ^ are used on the cross-reference
327
   --           line for a subprogram, to denote formal parameters and their
328
   --           modes. As with the 'z' and 'p' entries, each such entry is
329
   --           an implicit reference to an entity with a different name.
330
 
331
   --           [..] is used for generic instantiation references. These
332
   --           references are present only if the entity in question is
333
   --           a generic entity, and in that case the [..] contains the
334
   --           reference for the instantiation. In the case of nested
335
   --           instantiations, this can be nested [...[...[...]]] etc. The
336
   --           reference is of the form [file|line] no column is present since
337
   --           it is assumed that only one instantiation appears on a single
338
   --           source line. Note that the appearance of file numbers in such
339
   --           references follows the normal rules (present only if needed,
340
   --           and resets the current file for subsequent references).
341
 
342
   --     Examples:
343
 
344
   --        44B5*Flag_Type{boolean} 5r23 6m45 3|9r35 11r56
345
 
346
   --           This line gives references for the publicly visible Boolean
347
   --           type Flag_Type declared on line 44, column 5. There are four
348
   --           references
349
 
350
   --              a reference on line 5, column 23 of the current file
351
 
352
   --              a modification on line 6, column 45 of the current file
353
 
354
   --              a reference on line 9, column 35 of unit number 3
355
 
356
   --              a reference on line 11, column 56 of unit number 3
357
 
358
   --        2U13 p3=2:35 5b13 8r4 12r13 12t15
359
 
360
   --           This line gives references for the non-publicly visible
361
   --           procedure p3 declared on line 2, column 13. This procedure
362
   --           renames the procedure whose identifier reference is at
363
   --           line 2 column 35. There are four references:
364
 
365
   --              the corresponding body entity at line 5, column 13,
366
   --              of the current file.
367
 
368
   --              a reference (e.g. a call) at line 8 column 4 of the
369
   --              of the current file.
370
 
371
   --              the END line of the body has an explicit reference to
372
   --              the name of the procedure at line 12, column 13.
373
 
374
   --              the body ends at line 12, column 15, just past this label
375
 
376
   --        16I9*My_Type<2|4I9> 18r8
377
 
378
   --           This line gives references for the publicly visible Integer
379
   --           derived type My_Type declared on line 16, column 9. It also
380
   --           gives references to the parent type declared in the unit
381
   --           number 2 on line 4, column 9. There is one reference:
382
 
383
   --              a reference (e.g. a variable declaration) at line 18 column
384
   --              4 of the current file.
385
 
386
   --        10I3*Genv{integer} 3|4I10[6|12]
387
 
388
   --           This line gives a reference for the entity Genv in a generic
389
   --           package. The reference in file 3, line 4, col 10, refers to an
390
   --           instance of the generic where the instantiation can be found in
391
   --           file 6 at line 12.
392
 
393
   --  Continuation lines are used if the reference list gets too long,
394
   --  a continuation line starts with a period, and then has references
395
   --  continuing from the previous line. The references are sorted first
396
   --  by unit, then by position in the source.
397
 
398
   --  Note on handling of generic entities. The cross-reference is oriented
399
   --  towards source references, so the entities in a generic instantiation
400
   --  are not considered distinct from the entities in the template. All
401
   --  definitions and references from generic instantiations are suppressed,
402
   --  since they will be generated from the template. Any references to
403
   --  entities in a generic instantiation from outside the instantiation
404
   --  are considered to be references to the original template entity.
405
 
406
   ----------------------------------------
407
   -- Cross-Reference Entity Identifiers --
408
   ----------------------------------------
409
 
410
   --  In the cross-reference section of the ali file, entity types are
411
   --  identified by a single letter, indicating the entity type. The following
412
   --  table indicates the letter. A space for an entry is used for entities
413
   --  that do not appear in the cross-reference table.
414
 
415
   --  For objects, the character * appears in this table. In the xref listing,
416
   --  this character is replaced by the lower case letter that corresponds to
417
   --  the type of the object. For example, if a variable is of a Float type,
418
   --  then, since the type is represented by an upper case F, the object would
419
   --  be represented by a lower case f.
420
 
421
   --  A special exception is the case of booleans, whose entities are normal
422
   --  E_Enumeration_Type or E_Enumeration_Subtype entities, but which appear
423
   --  as B/b in the xref lines, rather than E/e.
424
 
425
   --  For private types, the character + appears in the table. In this case
426
   --  the kind of the underlying type is used, if available, to determine the
427
   --  character to use in the xref listing. The listing will still include a
428
   --  '+' for a generic private type, for example, but will retain the '*' for
429
   --  an object or formal parameter of such a type.
430
 
431
   --  For subprograms, the characters 'U' and 'V' appear in the table,
432
   --  indicating procedures and functions. If the operation is abstract,
433
   --  these letters are replaced in the xref by 'x' and 'y' respectively.
434
 
435
   Xref_Entity_Letters : array (Entity_Kind) of Character :=
436
     (E_Void                                       => ' ',
437
      E_Variable                                   => '*',
438
      E_Component                                  => '*',
439
      E_Constant                                   => '*',
440
      E_Discriminant                               => '*',
441
 
442
      E_Loop_Parameter                             => '*',
443
      E_In_Parameter                               => '*',
444
      E_Out_Parameter                              => '*',
445
      E_In_Out_Parameter                           => '*',
446
      E_Generic_In_Out_Parameter                   => '*',
447
 
448
      E_Generic_In_Parameter                       => '*',
449
      E_Named_Integer                              => 'N',
450
      E_Named_Real                                 => 'N',
451
      E_Enumeration_Type                           => 'E',  -- B for boolean
452
      E_Enumeration_Subtype                        => 'E',  -- B for boolean
453
 
454
      E_Signed_Integer_Type                        => 'I',
455
      E_Signed_Integer_Subtype                     => 'I',
456
      E_Modular_Integer_Type                       => 'M',
457
      E_Modular_Integer_Subtype                    => 'M',
458
      E_Ordinary_Fixed_Point_Type                  => 'O',
459
 
460
      E_Ordinary_Fixed_Point_Subtype               => 'O',
461
      E_Decimal_Fixed_Point_Type                   => 'D',
462
      E_Decimal_Fixed_Point_Subtype                => 'D',
463
      E_Floating_Point_Type                        => 'F',
464
      E_Floating_Point_Subtype                     => 'F',
465
 
466
      E_Access_Type                                => 'P',
467
      E_Access_Subtype                             => 'P',
468
      E_Access_Attribute_Type                      => 'P',
469
      E_Allocator_Type                             => ' ',
470
      E_General_Access_Type                        => 'P',
471
 
472
      E_Access_Subprogram_Type                     => 'P',
473
      E_Access_Protected_Subprogram_Type           => 'P',
474
      E_Anonymous_Access_Subprogram_Type           => ' ',
475
      E_Anonymous_Access_Protected_Subprogram_Type => ' ',
476
      E_Anonymous_Access_Type                      => ' ',
477
 
478
      E_Array_Type                                 => 'A',
479
      E_Array_Subtype                              => 'A',
480
      E_String_Type                                => 'S',
481
      E_String_Subtype                             => 'S',
482
      E_String_Literal_Subtype                     => ' ',
483
 
484
      E_Class_Wide_Type                            => 'C',
485
      E_Class_Wide_Subtype                         => 'C',
486
      E_Record_Type                                => 'R',
487
      E_Record_Subtype                             => 'R',
488
      E_Record_Type_With_Private                   => 'R',
489
 
490
      E_Record_Subtype_With_Private                => 'R',
491
      E_Private_Type                               => '+',
492
      E_Private_Subtype                            => '+',
493
      E_Limited_Private_Type                       => '+',
494
      E_Limited_Private_Subtype                    => '+',
495
 
496
      E_Incomplete_Type                            => '+',
497
      E_Incomplete_Subtype                         => '+',
498
      E_Task_Type                                  => 'T',
499
      E_Task_Subtype                               => 'T',
500
      E_Protected_Type                             => 'W',
501
 
502
      E_Protected_Subtype                          => 'W',
503
      E_Exception_Type                             => ' ',
504
      E_Subprogram_Type                            => ' ',
505
      E_Enumeration_Literal                        => 'n',
506
      E_Function                                   => 'V',
507
 
508
      E_Operator                                   => 'V',
509
      E_Procedure                                  => 'U',
510
      E_Entry                                      => 'Y',
511
      E_Entry_Family                               => 'Y',
512
      E_Block                                      => 'q',
513
 
514
      E_Entry_Index_Parameter                      => '*',
515
      E_Exception                                  => 'X',
516
      E_Generic_Function                           => 'v',
517
      E_Generic_Package                            => 'k',
518
      E_Generic_Procedure                          => 'u',
519
 
520
      E_Label                                      => 'L',
521
      E_Loop                                       => 'l',
522
      E_Return_Statement                           => ' ',
523
      E_Package                                    => 'K',
524
 
525
      --  The following entities are not ones to which we gather the cross-
526
      --  references, since it does not make sense to do so (e.g. references to
527
      --  a package are to the spec, not the body) Indeed the occurrence of the
528
      --  body entity is considered to be a reference to the spec entity.
529
 
530
      E_Package_Body                               => ' ',
531
      E_Protected_Object                           => ' ',
532
      E_Protected_Body                             => ' ',
533
      E_Task_Body                                  => ' ',
534
      E_Subprogram_Body                            => ' ');
535
 
536
   --  The following table is for information purposes. It shows the use of
537
   --  each character appearing as an entity type.
538
 
539
   --  letter  lower case usage                UPPER CASE USAGE
540
 
541
   --    a     array object (except string)    array type (except string)
542
   --    b     Boolean object                  Boolean type
543
   --    c     class-wide object               class-wide type
544
   --    d     decimal fixed-point object      decimal fixed-point type
545
   --    e     non-Boolean enumeration object  non_Boolean enumeration type
546
   --    f     floating-point object           floating-point type
547
   --    g     C/C++ macro                     C/C++ fun-like macro
548
   --    h     Interface (Ada 2005)            Abstract type
549
   --    i     signed integer object           signed integer type
550
   --    j     C++ class object                C++ class
551
   --    k     generic package                 package
552
   --    l     label on loop                   label on statement
553
   --    m     modular integer object          modular integer type
554
   --    n     enumeration literal             named number
555
   --    o     ordinary fixed-point object     ordinary fixed-point type
556
   --    p     access object                   access type
557
   --    q     label on block                  C/C++ include file
558
   --    r     record object                   record type
559
   --    s     string object                   string type
560
   --    t     task object                     task type
561
   --    u     generic procedure               procedure
562
   --    v     generic function or operator    function or operator
563
   --    w     protected object                protected type
564
   --    x     abstract procedure              exception
565
   --    y     abstract function               entry or entry family
566
   --    z     generic formal parameter        (unused)
567
 
568
   --------------------------------------
569
   -- Handling of Imported Subprograms --
570
   --------------------------------------
571
 
572
   --  If a pragma Import or Interface applies to a subprogram, the pragma is
573
   --  the completion of the subprogram. This is noted in the ALI file by
574
   --  making the occurrence of the subprogram in the pragma into a body
575
   --  reference ('b') and by including the external name of the subprogram and
576
   --  its language, bracketed by '<' and '>' in that reference. For example:
577
   --
578
   --     3U13*elsewhere 4b<c,there>21
579
   --
580
   --  indicates that procedure elsewhere, declared at line 3, has a pragma
581
   --  Import at line 4, that its body is in C, and that the link name as given
582
   --  in the pragma is "there".
583
 
584
   ----------------------
585
   -- Alfa Information --
586
   ----------------------
587
 
588
   --  This package defines procedures for collecting Alfa information and
589
   --  printing in ALI files.
590
 
591
   package Alfa is
592
 
593
      function Enclosing_Subprogram_Or_Package (N : Node_Id) return Entity_Id;
594
      --  Return the closest enclosing subprogram of package
595
 
596
      procedure Generate_Dereference
597
        (N   : Node_Id;
598
         Typ : Character := 'r');
599
      --  This procedure is called to record a dereference. N is the location
600
      --  of the dereference.
601
 
602
      type Node_Processing is access procedure (N : Node_Id);
603
 
604
      procedure Traverse_Compilation_Unit
605
        (CU           : Node_Id;
606
         Process      : Node_Processing;
607
         Inside_Stubs : Boolean);
608
      --  This procedure is undocumented ???
609
 
610
      procedure Traverse_All_Compilation_Units (Process : Node_Processing);
611
      --  Call Process on all declarations through all compilation units
612
 
613
      procedure Collect_Alfa (Sdep_Table : Unit_Ref_Table; Num_Sdep : Nat);
614
      --  Collect Alfa information from library units (for files and scopes)
615
      --  and from cross-references. Fill in the tables in library package
616
      --  called Alfa.
617
 
618
      procedure Output_Alfa is new Put_Alfa;
619
      --  Output Alfa information to the ALI files, based on the information
620
      --  collected in the tables in library package called Alfa, and using
621
      --  routines in Lib.Util.
622
 
623
   end Alfa;
624
 
625
   -----------------
626
   -- Subprograms --
627
   -----------------
628
 
629
   procedure Generate_Definition (E : Entity_Id);
630
   --  Records the definition of an entity
631
 
632
   procedure Generate_Operator_Reference
633
     (N : Node_Id;
634
      T : Entity_Id);
635
   --  Node N is an operator node, whose entity has been set. If this entity
636
   --  is a user defined operator (i.e. an operator not defined in package
637
   --  Standard), then a reference to the operator is recorded at node N.
638
   --  T is the operand type of the operator. A reference to the operator is an
639
   --  implicit reference to the type, and that needs to be recorded to avoid
640
   --  spurious warnings on unused entities, when the operator is a renaming of
641
   --  a predefined operator.
642
 
643
   procedure Generate_Reference
644
     (E       : Entity_Id;
645
      N       : Node_Id;
646
      Typ     : Character := 'r';
647
      Set_Ref : Boolean   := True;
648
      Force   : Boolean   := False);
649
   --  This procedure is called to record a reference. N is the location of the
650
   --  reference and E is the referenced entity. Typ is one of:
651
   --
652
   --    a character already described in the description of ref entries above
653
   --    ' ' for dummy reference (see below)
654
   --
655
   --  Note: all references to incomplete or private types are to the original
656
   --  (incomplete or private type) declaration. The full declaration is
657
   --  treated as a reference with type 'c'.
658
   --
659
   --  Note: all references to packages or subprograms are to the entity for
660
   --  the spec. The entity in the body is treated as a reference with type
661
   --  'b'. Similar handling for references to subprogram formals.
662
   --
663
   --  The call has no effect if N is not in the extended main source unit
664
   --  This check is omitted for type 'e' references (where it is useful to
665
   --  have structural scoping information for other than the main source),
666
   --  and for 'p' (since we want to pick up inherited primitive operations
667
   --  that are defined in other packages).
668
   --
669
   --  The call also has no effect if any of the following conditions hold:
670
   --
671
   --    cross-reference collection is disabled
672
   --    entity does not come from source (and Force is False)
673
   --    reference does not come from source (and Force is False)
674
   --    the entity is not one for which xrefs are appropriate
675
   --    the type letter is blank
676
   --    the node N is not an identifier, defining identifier, or expanded name
677
   --    the type is 'p' and the entity is not in the extended main source
678
   --
679
   --  If all these conditions are met, then the Is_Referenced flag of E is set
680
   --  (unless Set_Ref is False) and a cross-reference entry is recorded for
681
   --  later output when Output_References is called.
682
   --
683
   --  Note: the dummy space entry is for the convenience of some callers,
684
   --  who find it easier to pass a space to suppress the entry than to do
685
   --  a specific test. The call has no effect if the type is a space.
686
   --
687
   --  The parameter Set_Ref is normally True, and indicates that in addition
688
   --  to generating a cross-reference, the Referenced flag of the specified
689
   --  entity should be set. If this parameter is False, then setting of the
690
   --  Referenced flag is inhibited.
691
   --
692
   --  The parameter Force is set to True to force a reference to be generated
693
   --  even if Comes_From_Source is false. This is used for certain implicit
694
   --  references, and also for end label references.
695
 
696
   procedure Generate_Reference_To_Formals (E : Entity_Id);
697
   --  Add a reference to the definition of each formal on the line for
698
   --  a subprogram.
699
 
700
   procedure Generate_Reference_To_Generic_Formals (E : Entity_Id);
701
   --  Add a reference to the definition of each generic formal on the line
702
   --  for a generic unit.
703
 
704
   procedure Output_References;
705
   --  Output references to the current ali file
706
 
707
   procedure Initialize;
708
   --  Initialize internal tables
709
 
710
end Lib.Xref;

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.