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1 706 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                         GNAT COMPILER COMPONENTS                         --
4
--                                                                          --
5
--                             F R O N T E N D                              --
6
--                                                                          --
7
--                                 B o d y                                  --
8
--                                                                          --
9
--          Copyright (C) 1992-2011, 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
with System.Strings; use System.Strings;
27
 
28
with Atree;    use Atree;
29
with Checks;
30
with CStand;
31
with Debug;    use Debug;
32
with Elists;
33
with Exp_Dbug;
34
with Fmap;
35
with Fname.UF;
36
with Inline;   use Inline;
37
with Lib;      use Lib;
38
with Lib.Load; use Lib.Load;
39
with Live;     use Live;
40
with Namet;    use Namet;
41
with Nlists;   use Nlists;
42
with Opt;      use Opt;
43
with Osint;
44
with Par;
45
with Prep;
46
with Prepcomp;
47
with Restrict; use Restrict;
48
with Rident;   use Rident;
49
with Rtsfind;  use Rtsfind;
50
with Snames;   use Snames;
51
with Sprint;
52
with Scn;      use Scn;
53
with Sem;      use Sem;
54
with Sem_Aux;
55
with Sem_Ch8;  use Sem_Ch8;
56
with Sem_SCIL;
57
with Sem_Elab; use Sem_Elab;
58
with Sem_Prag; use Sem_Prag;
59
with Sem_Warn; use Sem_Warn;
60
with Sinfo;    use Sinfo;
61
with Sinput;   use Sinput;
62
with Sinput.L; use Sinput.L;
63
with SCIL_LL;  use SCIL_LL;
64
with Targparm; use Targparm;
65
with Tbuild;   use Tbuild;
66
with Types;    use Types;
67
 
68
procedure Frontend is
69
   Config_Pragmas : List_Id;
70
   --  Gather configuration pragmas
71
 
72
begin
73
   --  Carry out package initializations. These are initializations which might
74
   --  logically be performed at elaboration time, were it not for the fact
75
   --  that we may be doing things more than once in the big loop over files.
76
   --  Like elaboration, the order in which these calls are made is in some
77
   --  cases important. For example, Lib cannot be initialized before Namet,
78
   --  since it uses names table entries.
79
 
80
   Rtsfind.Initialize;
81
   Atree.Initialize;
82
   Nlists.Initialize;
83
   Elists.Initialize;
84
   Lib.Load.Initialize;
85
   Sem_Aux.Initialize;
86
   Sem_Ch8.Initialize;
87
   Sem_Prag.Initialize;
88
   Fname.UF.Initialize;
89
   Checks.Initialize;
90
   Sem_Warn.Initialize;
91
   Prep.Initialize;
92
 
93
   if Generate_SCIL then
94
      SCIL_LL.Initialize;
95
   end if;
96
 
97
   --  Create package Standard
98
 
99
   CStand.Create_Standard;
100
 
101
   --  If the -gnatd.H flag is present, we are only interested in the Standard
102
   --  package, so the frontend has done its job here.
103
 
104
   if Debug_Flag_Dot_HH then
105
      return;
106
   end if;
107
 
108
   --  Check possible symbol definitions specified by -gnateD switches
109
 
110
   Prepcomp.Process_Command_Line_Symbol_Definitions;
111
 
112
   --  If -gnatep= was specified, parse the preprocessing data file
113
 
114
   if Preprocessing_Data_File /= null then
115
      Name_Len := Preprocessing_Data_File'Length;
116
      Name_Buffer (1 .. Name_Len) := Preprocessing_Data_File.all;
117
      Prepcomp.Parse_Preprocessing_Data_File (Name_Find);
118
 
119
   --  Otherwise, check if there were preprocessing symbols on the command
120
   --  line and set preprocessing if there are.
121
 
122
   else
123
      Prepcomp.Check_Symbols;
124
   end if;
125
 
126
   --  We set Parsing_Main_Extended_Source true here to cover processing of all
127
   --  the configuration pragma files, as well as the main source unit itself.
128
 
129
   Parsing_Main_Extended_Source := True;
130
 
131
   --  Now that the preprocessing situation is established, we are able to
132
   --  load the main source (this is no longer done by Lib.Load.Initialize).
133
 
134
   Lib.Load.Load_Main_Source;
135
 
136
   --  Return immediately if the main source could not be found
137
 
138
   if Sinput.Main_Source_File = No_Source_File then
139
      return;
140
   end if;
141
 
142
   --  Read and process configuration pragma files if present
143
 
144
   declare
145
      Save_Style_Check : constant Boolean := Opt.Style_Check;
146
      --  Save style check mode so it can be restored later
147
 
148
      Source_Config_File : Source_File_Index;
149
      --  Source reference for -gnatec configuration file
150
 
151
      Prag : Node_Id;
152
 
153
   begin
154
      --  We always analyze config files with style checks off, since
155
      --  we don't want a miscellaneous gnat.adc that is around to
156
      --  discombobulate intended -gnatg or -gnaty compilations. We
157
      --  also disconnect checking for maximum line length.
158
 
159
      Opt.Style_Check := False;
160
      Style_Check := False;
161
 
162
      --  Capture current suppress options, which may get modified
163
 
164
      Scope_Suppress := Opt.Suppress_Options;
165
 
166
      --  First deal with gnat.adc file
167
 
168
      if Opt.Config_File then
169
         Name_Buffer (1 .. 8) := "gnat.adc";
170
         Name_Len := 8;
171
         Source_gnat_adc := Load_Config_File (Name_Enter);
172
 
173
         if Source_gnat_adc /= No_Source_File then
174
            Initialize_Scanner (No_Unit, Source_gnat_adc);
175
            Config_Pragmas := Par (Configuration_Pragmas => True);
176
         else
177
            Config_Pragmas := Empty_List;
178
         end if;
179
 
180
      else
181
         Config_Pragmas := Empty_List;
182
      end if;
183
 
184
      --  Now deal with specified config pragmas files if there are any
185
 
186
      if Opt.Config_File_Names /= null then
187
         for Index in Opt.Config_File_Names'Range loop
188
            Name_Len := Config_File_Names (Index)'Length;
189
            Name_Buffer (1 .. Name_Len) := Config_File_Names (Index).all;
190
            Source_Config_File := Load_Config_File (Name_Enter);
191
 
192
            if Source_Config_File = No_Source_File then
193
               Osint.Fail
194
                 ("cannot find configuration pragmas file "
195
                  & Config_File_Names (Index).all);
196
            end if;
197
 
198
            Initialize_Scanner (No_Unit, Source_Config_File);
199
            Append_List_To
200
              (Config_Pragmas, Par (Configuration_Pragmas => True));
201
         end loop;
202
      end if;
203
 
204
      --  Now analyze all pragmas except those whose analysis must be
205
      --  deferred till after the main unit is analyzed.
206
 
207
      if Config_Pragmas /= Error_List
208
        and then Operating_Mode /= Check_Syntax
209
      then
210
         Prag := First (Config_Pragmas);
211
         while Present (Prag) loop
212
            if not Delay_Config_Pragma_Analyze (Prag) then
213
               Analyze_Pragma (Prag);
214
            end if;
215
 
216
            Next (Prag);
217
         end loop;
218
      end if;
219
 
220
      --  Restore style check, but if config file turned on checks, leave on!
221
 
222
      Opt.Style_Check := Save_Style_Check or Style_Check;
223
 
224
      --  Capture any modifications to suppress options from config pragmas
225
 
226
      Opt.Suppress_Options := Scope_Suppress;
227
   end;
228
 
229
   --  This is where we can capture the value of the compilation unit specific
230
   --  restrictions that have been set by the config pragma files (or from
231
   --  Targparm), for later restoration when processing e.g. subunits.
232
 
233
   Save_Config_Cunit_Boolean_Restrictions;
234
 
235
   --  If there was a -gnatem switch, initialize the mappings of unit names to
236
   --  file names and of file names to path names from the mapping file.
237
 
238
   if Mapping_File_Name /= null then
239
      Fmap.Initialize (Mapping_File_Name.all);
240
   end if;
241
 
242
   --  Adjust Optimize_Alignment mode from debug switches if necessary
243
 
244
   if Debug_Flag_Dot_SS then
245
      Optimize_Alignment := 'S';
246
   elsif Debug_Flag_Dot_TT then
247
      Optimize_Alignment := 'T';
248
   end if;
249
 
250
   --  We have now processed the command line switches, and the configuration
251
   --  pragma files, so this is the point at which we want to capture the
252
   --  values of the configuration switches (see Opt for further details).
253
 
254
   Opt.Register_Opt_Config_Switches;
255
 
256
   --  Check for file which contains No_Body pragma
257
 
258
   if Source_File_Is_No_Body (Source_Index (Main_Unit)) then
259
      Change_Main_Unit_To_Spec;
260
   end if;
261
 
262
   --  Initialize the scanner. Note that we do this after the call to
263
   --  Create_Standard, which uses the scanner in its processing of
264
   --  floating-point bounds.
265
 
266
   Initialize_Scanner (Main_Unit, Source_Index (Main_Unit));
267
 
268
   --  Here we call the parser to parse the compilation unit (or units in
269
   --  the check syntax mode, but in that case we won't go on to the
270
   --  semantics in any case).
271
 
272
   Discard_List (Par (Configuration_Pragmas => False));
273
   Parsing_Main_Extended_Source := False;
274
 
275
   --  The main unit is now loaded, and subunits of it can be loaded,
276
   --  without reporting spurious loading circularities.
277
 
278
   Set_Loading (Main_Unit, False);
279
 
280
   --  Now that the main unit is installed, we can complete the analysis
281
   --  of the pragmas in gnat.adc and the configuration file, that require
282
   --  a context for their semantic processing.
283
 
284
   if Config_Pragmas /= Error_List
285
     and then Operating_Mode /= Check_Syntax
286
   then
287
      --  Pragmas that require some semantic activity, such as
288
      --  Interrupt_State, cannot be processed until the main unit
289
      --  is installed, because they require a compilation unit on
290
      --  which to attach with_clauses, etc. So analyze them now.
291
 
292
      declare
293
         Prag : Node_Id;
294
 
295
      begin
296
         Prag := First (Config_Pragmas);
297
         while Present (Prag) loop
298
            if Delay_Config_Pragma_Analyze (Prag) then
299
               Analyze_Pragma (Prag);
300
            end if;
301
 
302
            Next (Prag);
303
         end loop;
304
      end;
305
   end if;
306
 
307
   --  If we have restriction No_Exception_Propagation, and we did not have an
308
   --  explicit switch turning off Warn_On_Non_Local_Exception, then turn on
309
   --  this warning by default if we have encountered an exception handler.
310
 
311
   if Restriction_Check_Required (No_Exception_Propagation)
312
     and then not No_Warn_On_Non_Local_Exception
313
     and then Exception_Handler_Encountered
314
   then
315
      Warn_On_Non_Local_Exception := True;
316
   end if;
317
 
318
   --  Now on to the semantics. Skip if in syntax only mode
319
 
320
   if Operating_Mode /= Check_Syntax then
321
 
322
      --  Install the configuration pragmas in the tree
323
 
324
      Set_Config_Pragmas (Aux_Decls_Node (Cunit (Main_Unit)), Config_Pragmas);
325
 
326
      --  Following steps are skipped if we had a fatal error during parsing
327
 
328
      if not Fatal_Error (Main_Unit) then
329
 
330
         --  Reset Operating_Mode to Check_Semantics for subunits. We cannot
331
         --  actually generate code for subunits, so we suppress expansion.
332
         --  This also corrects certain problems that occur if we try to
333
         --  incorporate subunits at a lower level.
334
 
335
         if Operating_Mode = Generate_Code
336
           and then Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
337
         then
338
            Operating_Mode := Check_Semantics;
339
         end if;
340
 
341
         --  Analyze (and possibly expand) main unit
342
 
343
         Scope_Suppress := Suppress_Options;
344
         Semantics (Cunit (Main_Unit));
345
 
346
         --  Cleanup processing after completing main analysis
347
 
348
         if Operating_Mode = Generate_Code
349
           or else (Operating_Mode = Check_Semantics
350
                     and then ASIS_Mode)
351
         then
352
            Instantiate_Bodies;
353
         end if;
354
 
355
         if Operating_Mode = Generate_Code then
356
            if Inline_Processing_Required then
357
               Analyze_Inlined_Bodies;
358
            end if;
359
 
360
            --  Remove entities from program that do not have any
361
            --  execution time references.
362
 
363
            if Debug_Flag_UU then
364
               Collect_Garbage_Entities;
365
            end if;
366
 
367
            Check_Elab_Calls;
368
         end if;
369
 
370
         --  List library units if requested
371
 
372
         if List_Units then
373
            Lib.List;
374
         end if;
375
 
376
         --  Output waiting warning messages
377
 
378
         Sem_Warn.Output_Non_Modified_In_Out_Warnings;
379
         Sem_Warn.Output_Unreferenced_Messages;
380
         Sem_Warn.Check_Unused_Withs;
381
         Sem_Warn.Output_Unused_Warnings_Off_Warnings;
382
      end if;
383
   end if;
384
 
385
   --  Qualify all entity names in inner packages, package bodies, etc.,
386
   --  except when compiling for the VM back-ends, which depend on having
387
   --  unqualified names in certain cases and handles the generation of
388
   --  qualified names when needed.
389
 
390
   if VM_Target = No_VM then
391
      Exp_Dbug.Qualify_All_Entity_Names;
392
   end if;
393
 
394
   --  SCIL backend requirement. Check that SCIL nodes associated with
395
   --  dispatching calls reference subprogram calls.
396
 
397
   if Generate_SCIL then
398
      pragma Debug (Sem_SCIL.Check_SCIL_Nodes (Cunit (Main_Unit)));
399
      null;
400
   end if;
401
 
402
   --  Dump the source now. Note that we do this as soon as the analysis
403
   --  of the tree is complete, because it is not just a dump in the case
404
   --  of -gnatD, where it rewrites all source locations in the tree.
405
 
406
   Sprint.Source_Dump;
407
 
408
   --  Check again for configuration pragmas that appear in the context of
409
   --  the main unit. These pragmas only affect the main unit, and the
410
   --  corresponding flag is reset after each call to Semantics, but they
411
   --  may affect the generated ali for the unit, and therefore the flag
412
   --  must be set properly after compilation. Currently we only check for
413
   --  Initialize_Scalars, but others should be checked: as well???
414
 
415
   declare
416
      Item  : Node_Id;
417
 
418
   begin
419
      Item := First (Context_Items (Cunit (Main_Unit)));
420
      while Present (Item) loop
421
         if Nkind (Item) = N_Pragma
422
           and then Pragma_Name (Item) = Name_Initialize_Scalars
423
         then
424
            Initialize_Scalars := True;
425
         end if;
426
 
427
         Next (Item);
428
      end loop;
429
   end;
430
 
431
   --  If a mapping file has been specified by a -gnatem switch, update
432
   --  it if there has been some sources that were not in the mappings.
433
 
434
   if Mapping_File_Name /= null then
435
      Fmap.Update_Mapping_File (Mapping_File_Name.all);
436
   end if;
437
 
438
   return;
439
end Frontend;

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