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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [prepcomp.adb] - Blame information for rev 717

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1 706 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                         GNAT COMPILER COMPONENTS                         --
4
--                                                                          --
5
--                             P R E P C O M P                              --
6
--                                                                          --
7
--                                 B o d y                                  --
8
--                                                                          --
9
--          Copyright (C) 2003-2010, 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 Errout;   use Errout;
27
with Lib.Writ; use Lib.Writ;
28
with Opt;      use Opt;
29
with Osint;    use Osint;
30
with Prep;     use Prep;
31
with Scans;    use Scans;
32
with Scn;      use Scn;
33
with Sinput.L; use Sinput.L;
34
with Stringt;  use Stringt;
35
with Table;
36
with Types;    use Types;
37
 
38
package body Prepcomp is
39
 
40
   No_Preprocessing : Boolean := True;
41
   --  Set to False if there is at least one source that needs to be
42
   --  preprocessed.
43
 
44
   Source_Index_Of_Preproc_Data_File : Source_File_Index := No_Source_File;
45
 
46
   --  The following variable should be a constant, but this is not possible
47
   --  because its type GNAT.Dynamic_Tables.Instance has a component P of
48
   --  uninitialized private type GNAT.Dynamic_Tables.Table_Private and there
49
   --  are no exported values for this private type. Warnings are Off because
50
   --  it is never assigned a value.
51
 
52
   pragma Warnings (Off);
53
   No_Mapping : Prep.Symbol_Table.Instance;
54
   pragma Warnings (On);
55
 
56
   type Preproc_Data is record
57
      Mapping      : Symbol_Table.Instance;
58
      File_Name    : File_Name_Type := No_File;
59
      Deffile      : String_Id      := No_String;
60
      Undef_False  : Boolean        := False;
61
      Always_Blank : Boolean        := False;
62
      Comments     : Boolean        := False;
63
      List_Symbols : Boolean        := False;
64
      Processed    : Boolean        := False;
65
   end record;
66
   --  Structure to keep the preprocessing data for a file name or for the
67
   --  default (when Name_Id = No_Name).
68
 
69
   No_Preproc_Data : constant Preproc_Data :=
70
     (Mapping      => No_Mapping,
71
      File_Name    => No_File,
72
      Deffile      => No_String,
73
      Undef_False  => False,
74
      Always_Blank => False,
75
      Comments     => False,
76
      List_Symbols => False,
77
      Processed    => False);
78
 
79
   Default_Data : Preproc_Data := No_Preproc_Data;
80
   --  The preprocessing data to be used when no specific preprocessing data
81
   --  is specified for a source.
82
 
83
   Default_Data_Defined : Boolean := False;
84
   --  True if source for which no specific preprocessing is specified need to
85
   --  be preprocess with the Default_Data.
86
 
87
   Current_Data : Preproc_Data := No_Preproc_Data;
88
 
89
   package Preproc_Data_Table is new Table.Table
90
     (Table_Component_Type => Preproc_Data,
91
      Table_Index_Type     => Int,
92
      Table_Low_Bound      => 1,
93
      Table_Initial        => 5,
94
      Table_Increment      => 100,
95
      Table_Name           => "Prepcomp.Preproc_Data_Table");
96
   --  Table to store the specific preprocessing data
97
 
98
   Command_Line_Symbols : Symbol_Table.Instance;
99
   --  A table to store symbol definitions specified on the command line with
100
   --  -gnateD switches.
101
 
102
   package Dependencies is new Table.Table
103
     (Table_Component_Type => Source_File_Index,
104
      Table_Index_Type     => Int,
105
      Table_Low_Bound      => 1,
106
      Table_Initial        => 10,
107
      Table_Increment      => 100,
108
      Table_Name           => "Prepcomp.Dependencies");
109
   --  Table to store the dependencies on preprocessing files
110
 
111
   procedure Add_Command_Line_Symbols;
112
   --  Add the command line symbol definitions, if any, to Prep.Mapping table
113
 
114
   procedure Skip_To_End_Of_Line;
115
   --  Ignore errors and scan up to the next end of line or the end of file
116
 
117
   ------------------------------
118
   -- Add_Command_Line_Symbols --
119
   ------------------------------
120
 
121
   procedure Add_Command_Line_Symbols is
122
      Symbol_Id : Prep.Symbol_Id;
123
 
124
   begin
125
      for J in 1 .. Symbol_Table.Last (Command_Line_Symbols) loop
126
         Symbol_Id := Prep.Index_Of (Command_Line_Symbols.Table (J).Symbol);
127
 
128
         if Symbol_Id = No_Symbol then
129
            Symbol_Table.Increment_Last (Prep.Mapping);
130
            Symbol_Id := Symbol_Table.Last (Prep.Mapping);
131
         end if;
132
 
133
         Prep.Mapping.Table (Symbol_Id) := Command_Line_Symbols.Table (J);
134
      end loop;
135
   end Add_Command_Line_Symbols;
136
 
137
   ----------------------
138
   -- Add_Dependencies --
139
   ----------------------
140
 
141
   procedure Add_Dependencies is
142
   begin
143
      for Index in 1 .. Dependencies.Last loop
144
         Add_Preprocessing_Dependency (Dependencies.Table (Index));
145
      end loop;
146
   end Add_Dependencies;
147
 
148
   -------------------
149
   -- Check_Symbols --
150
   -------------------
151
 
152
   procedure Check_Symbols is
153
   begin
154
      --  If there is at least one switch -gnateD specified
155
 
156
      if Symbol_Table.Last (Command_Line_Symbols) >= 1 then
157
         Current_Data := No_Preproc_Data;
158
         No_Preprocessing := False;
159
         Current_Data.Processed := True;
160
 
161
         --  Start with an empty, initialized mapping table; use Prep.Mapping,
162
         --  because Prep.Index_Of uses Prep.Mapping.
163
 
164
         Prep.Mapping := No_Mapping;
165
         Symbol_Table.Init (Prep.Mapping);
166
 
167
         --  Add the command line symbols
168
 
169
         Add_Command_Line_Symbols;
170
 
171
         --  Put the resulting Prep.Mapping in Current_Data, and immediately
172
         --  set Prep.Mapping to nil.
173
 
174
         Current_Data.Mapping := Prep.Mapping;
175
         Prep.Mapping := No_Mapping;
176
 
177
         --  Set the default data
178
 
179
         Default_Data := Current_Data;
180
         Default_Data_Defined := True;
181
      end if;
182
   end Check_Symbols;
183
 
184
   ------------------------------
185
   -- Parse_Preprocessing_Data --
186
   ------------------------------
187
 
188
   procedure Parse_Preprocessing_Data_File (N : File_Name_Type) is
189
      OK            : Boolean := False;
190
      Dash_Location : Source_Ptr;
191
      Symbol_Data   : Prep.Symbol_Data;
192
      Symbol_Id     : Prep.Symbol_Id;
193
      T             : constant Nat := Total_Errors_Detected;
194
 
195
   begin
196
      --  Load the preprocessing data file
197
 
198
      Source_Index_Of_Preproc_Data_File := Load_Preprocessing_Data_File (N);
199
 
200
      --  Fail if preprocessing data file cannot be found
201
 
202
      if Source_Index_Of_Preproc_Data_File = No_Source_File then
203
         Get_Name_String (N);
204
         Fail ("preprocessing data file """
205
               & Name_Buffer (1 .. Name_Len)
206
               & """ not found");
207
      end if;
208
 
209
      --  Initialize scanner and set its behavior for processing a data file
210
 
211
      Scn.Scanner.Initialize_Scanner (Source_Index_Of_Preproc_Data_File);
212
      Scn.Scanner.Set_End_Of_Line_As_Token (True);
213
      Scn.Scanner.Reset_Special_Characters;
214
 
215
      For_Each_Line : loop
216
         <<Scan_Line>>
217
         Scan;
218
 
219
         exit For_Each_Line when Token = Tok_EOF;
220
 
221
         if Token = Tok_End_Of_Line then
222
            goto Scan_Line;
223
         end if;
224
 
225
         --  Line is not empty
226
 
227
         OK := False;
228
         No_Preprocessing := False;
229
         Current_Data := No_Preproc_Data;
230
 
231
         case Token is
232
            when Tok_Asterisk =>
233
 
234
               --  Default data
235
 
236
               if Default_Data_Defined then
237
                  Error_Msg
238
                    ("multiple default preprocessing data", Token_Ptr);
239
 
240
               else
241
                  OK := True;
242
                  Default_Data_Defined := True;
243
               end if;
244
 
245
            when Tok_String_Literal =>
246
 
247
               --  Specific data
248
 
249
               String_To_Name_Buffer (String_Literal_Id);
250
               Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
251
               Current_Data.File_Name := Name_Find;
252
               OK := True;
253
 
254
               for Index in 1 .. Preproc_Data_Table.Last loop
255
                  if Current_Data.File_Name =
256
                       Preproc_Data_Table.Table (Index).File_Name
257
                  then
258
                     Error_Msg_File_1 := Current_Data.File_Name;
259
                     Error_Msg
260
                       ("multiple preprocessing data for{", Token_Ptr);
261
                     OK := False;
262
                     exit;
263
                  end if;
264
               end loop;
265
 
266
            when others =>
267
               Error_Msg ("`'*` or literal string expected", Token_Ptr);
268
         end case;
269
 
270
         --  If there is a problem, skip the line
271
 
272
         if not OK then
273
            Skip_To_End_Of_Line;
274
            goto Scan_Line;
275
         end if;
276
 
277
         --  Scan past the * or the literal string
278
 
279
         Scan;
280
 
281
         --  A literal string in second position is a definition file
282
 
283
         if Token = Tok_String_Literal then
284
            Current_Data.Deffile := String_Literal_Id;
285
            Current_Data.Processed := False;
286
            Scan;
287
 
288
         else
289
            --  If there is no definition file, set Processed to True now
290
 
291
            Current_Data.Processed := True;
292
         end if;
293
 
294
         --  Start with an empty, initialized mapping table; use Prep.Mapping,
295
         --  because Prep.Index_Of uses Prep.Mapping.
296
 
297
         Prep.Mapping := No_Mapping;
298
         Symbol_Table.Init (Prep.Mapping);
299
 
300
         --  Check the switches that may follow
301
 
302
         while Token /= Tok_End_Of_Line and then Token /= Tok_EOF loop
303
            if Token /= Tok_Minus then
304
               Error_Msg -- CODEFIX
305
                 ("`'-` expected", Token_Ptr);
306
               Skip_To_End_Of_Line;
307
               goto Scan_Line;
308
            end if;
309
 
310
            --  Keep the location of the '-' for possible error reporting
311
 
312
            Dash_Location := Token_Ptr;
313
 
314
            --  Scan past the '-'
315
 
316
            Scan;
317
            OK := False;
318
            Change_Reserved_Keyword_To_Symbol;
319
 
320
            --  An identifier (or a reserved word converted to an
321
            --  identifier) is expected and there must be no blank space
322
            --  between the '-' and the identifier.
323
 
324
            if Token = Tok_Identifier
325
              and then Token_Ptr = Dash_Location + 1
326
            then
327
               Get_Name_String (Token_Name);
328
 
329
               --  Check the character in the source, because the case is
330
               --  significant.
331
 
332
               case Sinput.Source (Token_Ptr) is
333
                  when 'u' =>
334
 
335
                     --  Undefined symbol are False
336
 
337
                     if Name_Len = 1 then
338
                        Current_Data.Undef_False := True;
339
                        OK := True;
340
                     end if;
341
 
342
                  when 'b' =>
343
 
344
                     --  Blank lines
345
 
346
                     if Name_Len = 1 then
347
                        Current_Data.Always_Blank := True;
348
                        OK := True;
349
                     end if;
350
 
351
                  when 'c' =>
352
 
353
                     --  Comment removed lines
354
 
355
                     if Name_Len = 1 then
356
                        Current_Data.Comments := True;
357
                        OK := True;
358
                     end if;
359
 
360
                  when 's' =>
361
 
362
                     --  List symbols
363
 
364
                     if Name_Len = 1 then
365
                        Current_Data.List_Symbols := True;
366
                        OK := True;
367
                     end if;
368
 
369
                  when 'D' =>
370
 
371
                     --  Symbol definition
372
 
373
                     OK := Name_Len > 1;
374
 
375
                     if OK then
376
 
377
                        --  A symbol must be an Ada identifier; it cannot start
378
                        --  with an underline or a digit.
379
 
380
                        if Name_Buffer (2) = '_'
381
                          or else Name_Buffer (2) in '0' .. '9'
382
                        then
383
                           Error_Msg ("symbol expected", Token_Ptr + 1);
384
                           Skip_To_End_Of_Line;
385
                           goto Scan_Line;
386
                        end if;
387
 
388
                        --  Get the name id of the symbol
389
 
390
                        Symbol_Data.On_The_Command_Line := True;
391
                        Name_Buffer (1 .. Name_Len - 1) :=
392
                          Name_Buffer (2 .. Name_Len);
393
                        Name_Len := Name_Len - 1;
394
                        Symbol_Data.Symbol := Name_Find;
395
 
396
                        if Name_Buffer (1 .. Name_Len) = "if"
397
                          or else Name_Buffer (1 .. Name_Len) = "else"
398
                          or else Name_Buffer (1 .. Name_Len) = "elsif"
399
                          or else Name_Buffer (1 .. Name_Len) = "end"
400
                          or else Name_Buffer (1 .. Name_Len) = "not"
401
                          or else Name_Buffer (1 .. Name_Len) = "and"
402
                          or else Name_Buffer (1 .. Name_Len) = "then"
403
                        then
404
                           Error_Msg ("symbol expected", Token_Ptr + 1);
405
                           Skip_To_End_Of_Line;
406
                           goto Scan_Line;
407
                        end if;
408
 
409
                        --  Get the name id of the original symbol, with
410
                        --  possibly capital letters.
411
 
412
                        Name_Len := Integer (Scan_Ptr - Token_Ptr - 1);
413
 
414
                        for J in 1 .. Name_Len loop
415
                           Name_Buffer (J) :=
416
                             Sinput.Source (Token_Ptr + Text_Ptr (J));
417
                        end loop;
418
 
419
                        Symbol_Data.Original := Name_Find;
420
 
421
                        --  Scan past D<symbol>
422
 
423
                        Scan;
424
 
425
                        if Token /= Tok_Equal then
426
                           Error_Msg -- CODEFIX
427
                             ("`=` expected", Token_Ptr);
428
                           Skip_To_End_Of_Line;
429
                           goto Scan_Line;
430
                        end if;
431
 
432
                        --  Scan past '='
433
 
434
                        Scan;
435
 
436
                        --  Here any reserved word is OK
437
 
438
                        Change_Reserved_Keyword_To_Symbol
439
                          (All_Keywords => True);
440
 
441
                        --  Value can be an identifier (or a reserved word)
442
                        --  or a literal string.
443
 
444
                        case Token is
445
                           when Tok_String_Literal =>
446
                              Symbol_Data.Is_A_String := True;
447
                              Symbol_Data.Value := String_Literal_Id;
448
 
449
                           when Tok_Identifier =>
450
                              Symbol_Data.Is_A_String := False;
451
                              Start_String;
452
 
453
                              for J in Token_Ptr .. Scan_Ptr - 1 loop
454
                                 Store_String_Char (Sinput.Source (J));
455
                              end loop;
456
 
457
                              Symbol_Data.Value := End_String;
458
 
459
                           when others =>
460
                              Error_Msg
461
                                ("literal string or identifier expected",
462
                                 Token_Ptr);
463
                              Skip_To_End_Of_Line;
464
                              goto Scan_Line;
465
                        end case;
466
 
467
                        --  If symbol already exists, replace old definition
468
                        --  by new one.
469
 
470
                        Symbol_Id := Prep.Index_Of (Symbol_Data.Symbol);
471
 
472
                        --  Otherwise, add a new entry in the table
473
 
474
                        if Symbol_Id = No_Symbol then
475
                           Symbol_Table.Increment_Last (Prep.Mapping);
476
                           Symbol_Id := Symbol_Table.Last (Mapping);
477
                        end if;
478
 
479
                        Prep.Mapping.Table (Symbol_Id) := Symbol_Data;
480
                     end if;
481
 
482
                  when others =>
483
                     null;
484
               end case;
485
 
486
               Scan;
487
            end if;
488
 
489
            if not OK then
490
               Error_Msg ("invalid switch", Dash_Location);
491
               Skip_To_End_Of_Line;
492
               goto Scan_Line;
493
            end if;
494
         end loop;
495
 
496
         --  Add the command line symbols, if any, possibly replacing symbols
497
         --  just defined.
498
 
499
         Add_Command_Line_Symbols;
500
 
501
         --  Put the resulting Prep.Mapping in Current_Data, and immediately
502
         --  set Prep.Mapping to nil.
503
 
504
         Current_Data.Mapping := Prep.Mapping;
505
         Prep.Mapping := No_Mapping;
506
 
507
         --  Record Current_Data
508
 
509
         if Current_Data.File_Name = No_File then
510
            Default_Data := Current_Data;
511
 
512
         else
513
            Preproc_Data_Table.Increment_Last;
514
            Preproc_Data_Table.Table (Preproc_Data_Table.Last) := Current_Data;
515
         end if;
516
 
517
         Current_Data := No_Preproc_Data;
518
      end loop For_Each_Line;
519
 
520
      Scn.Scanner.Set_End_Of_Line_As_Token (False);
521
 
522
      --  Fail if there were errors in the preprocessing data file
523
 
524
      if Total_Errors_Detected > T then
525
         Errout.Finalize (Last_Call => True);
526
         Errout.Output_Messages;
527
         Fail ("errors found in preprocessing data file """
528
               & Get_Name_String (N) & """");
529
      end if;
530
 
531
      --  Record the dependency on the preprocessor data file
532
 
533
      Dependencies.Increment_Last;
534
      Dependencies.Table (Dependencies.Last) :=
535
        Source_Index_Of_Preproc_Data_File;
536
   end Parse_Preprocessing_Data_File;
537
 
538
   ---------------------------
539
   -- Prepare_To_Preprocess --
540
   ---------------------------
541
 
542
   procedure Prepare_To_Preprocess
543
     (Source               : File_Name_Type;
544
      Preprocessing_Needed : out Boolean)
545
   is
546
      Default : Boolean := False;
547
      Index   : Int := 0;
548
 
549
   begin
550
      --  By default, preprocessing is not needed
551
 
552
      Preprocessing_Needed := False;
553
 
554
      if No_Preprocessing then
555
         return;
556
      end if;
557
 
558
      --  First, look for preprocessing data specific to the current source
559
 
560
      for J in 1 .. Preproc_Data_Table.Last loop
561
         if Preproc_Data_Table.Table (J).File_Name = Source then
562
            Index := J;
563
            Current_Data := Preproc_Data_Table.Table (J);
564
            exit;
565
         end if;
566
      end loop;
567
 
568
      --  If no specific preprocessing data, then take the default
569
 
570
      if Index = 0 then
571
         if Default_Data_Defined then
572
            Current_Data := Default_Data;
573
            Default := True;
574
 
575
         else
576
            --  If no default, then nothing to do
577
 
578
            return;
579
         end if;
580
      end if;
581
 
582
      --  Set the preprocessing flags according to the preprocessing data
583
 
584
      if Current_Data.Comments and then not Current_Data.Always_Blank then
585
         Comment_Deleted_Lines := True;
586
         Blank_Deleted_Lines   := False;
587
 
588
      else
589
         Comment_Deleted_Lines := False;
590
         Blank_Deleted_Lines   := True;
591
      end if;
592
 
593
      Undefined_Symbols_Are_False := Current_Data.Undef_False;
594
      List_Preprocessing_Symbols  := Current_Data.List_Symbols;
595
 
596
      --  If not already done it, process the definition file
597
 
598
      if Current_Data.Processed then
599
 
600
         --  Set Prep.Mapping
601
 
602
         Prep.Mapping := Current_Data.Mapping;
603
 
604
      else
605
         --  First put the mapping in Prep.Mapping, because Prep.Parse_Def_File
606
         --  works on Prep.Mapping.
607
 
608
         Prep.Mapping := Current_Data.Mapping;
609
 
610
         String_To_Name_Buffer (Current_Data.Deffile);
611
 
612
         declare
613
            N           : constant File_Name_Type    := Name_Find;
614
            Deffile     : constant Source_File_Index :=
615
                            Load_Definition_File (N);
616
            Add_Deffile : Boolean                    := True;
617
            T           : constant Nat               := Total_Errors_Detected;
618
 
619
         begin
620
            if Deffile = No_Source_File then
621
               Fail ("definition file """
622
                     & Get_Name_String (N)
623
                     & """ not found");
624
            end if;
625
 
626
            --  Initialize the preprocessor and set the characteristics of the
627
            --  scanner for a definition file.
628
 
629
            Prep.Setup_Hooks
630
              (Error_Msg         => Errout.Error_Msg'Access,
631
               Scan              => Scn.Scanner.Scan'Access,
632
               Set_Ignore_Errors => Errout.Set_Ignore_Errors'Access,
633
               Put_Char          => null,
634
               New_EOL           => null);
635
 
636
            Scn.Scanner.Set_End_Of_Line_As_Token (True);
637
            Scn.Scanner.Reset_Special_Characters;
638
 
639
            --  Initialize the scanner and process the definition file
640
 
641
            Scn.Scanner.Initialize_Scanner (Deffile);
642
            Prep.Parse_Def_File;
643
 
644
            --  Reset the behaviour of the scanner to the default
645
 
646
            Scn.Scanner.Set_End_Of_Line_As_Token (False);
647
 
648
            --  Fail if errors were found while processing the definition file
649
 
650
            if T /= Total_Errors_Detected then
651
               Errout.Finalize (Last_Call => True);
652
               Errout.Output_Messages;
653
               Fail ("errors found in definition file """
654
                     & Get_Name_String (N)
655
                     & """");
656
            end if;
657
 
658
            for Index in 1 .. Dependencies.Last loop
659
               if Dependencies.Table (Index) = Deffile then
660
                  Add_Deffile := False;
661
                  exit;
662
               end if;
663
            end loop;
664
 
665
            if Add_Deffile then
666
               Dependencies.Increment_Last;
667
               Dependencies.Table (Dependencies.Last) := Deffile;
668
            end if;
669
         end;
670
 
671
         --  Get back the mapping, indicate that the definition file is
672
         --  processed and store back the preprocessing data.
673
 
674
         Current_Data.Mapping := Prep.Mapping;
675
         Current_Data.Processed := True;
676
 
677
         if Default then
678
            Default_Data := Current_Data;
679
 
680
         else
681
            Preproc_Data_Table.Table (Index) := Current_Data;
682
         end if;
683
      end if;
684
 
685
      Preprocessing_Needed := True;
686
   end Prepare_To_Preprocess;
687
 
688
   ---------------------------------------------
689
   -- Process_Command_Line_Symbol_Definitions --
690
   ---------------------------------------------
691
 
692
   procedure Process_Command_Line_Symbol_Definitions is
693
      Symbol_Data : Prep.Symbol_Data;
694
      Found : Boolean := False;
695
 
696
   begin
697
      Symbol_Table.Init (Command_Line_Symbols);
698
 
699
      --  The command line definitions have been stored temporarily in
700
      --  array Symbol_Definitions.
701
 
702
      for Index in 1 .. Preprocessing_Symbol_Last loop
703
         --  Check each symbol definition, fail immediately if syntax is not
704
         --  correct.
705
 
706
         Check_Command_Line_Symbol_Definition
707
           (Definition => Preprocessing_Symbol_Defs (Index).all,
708
            Data       => Symbol_Data);
709
         Found := False;
710
 
711
         --  If there is already a definition for this symbol, replace the old
712
         --  definition by this one.
713
 
714
         for J in 1 .. Symbol_Table.Last (Command_Line_Symbols) loop
715
            if Command_Line_Symbols.Table (J).Symbol = Symbol_Data.Symbol then
716
               Command_Line_Symbols.Table (J) := Symbol_Data;
717
               Found := True;
718
               exit;
719
            end if;
720
         end loop;
721
 
722
         --  Otherwise, create a new entry in the table
723
 
724
         if not Found then
725
            Symbol_Table.Increment_Last (Command_Line_Symbols);
726
            Command_Line_Symbols.Table
727
              (Symbol_Table.Last (Command_Line_Symbols)) := Symbol_Data;
728
         end if;
729
      end loop;
730
   end Process_Command_Line_Symbol_Definitions;
731
 
732
   -------------------------
733
   -- Skip_To_End_Of_Line --
734
   -------------------------
735
 
736
   procedure Skip_To_End_Of_Line is
737
   begin
738
      Set_Ignore_Errors (To => True);
739
 
740
      while Token /= Tok_End_Of_Line and then Token /= Tok_EOF loop
741
         Scan;
742
      end loop;
743
 
744
      Set_Ignore_Errors (To => False);
745
   end Skip_To_End_Of_Line;
746
 
747
end Prepcomp;

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