summaryrefslogtreecommitdiffstats
path: root/gcc/ada/sinput.adb
blob: 6eabba27599ee6867e04a1227a698df248b60f87 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                               S I N P U T                                --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2005 Free Software Foundation, Inc.          --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
-- MA 02111-1307, USA.                                                      --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable  to  be --
-- covered  by the  GNU  General  Public  License.  This exception does not --
-- however invalidate  any other reasons why  the executable file  might be --
-- covered by the  GNU Public License.                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

pragma Style_Checks (All_Checks);
--  Subprograms not all in alpha order

with Debug;    use Debug;
with Namet;    use Namet;
with Opt;      use Opt;
with Output;   use Output;
with Tree_IO;  use Tree_IO;
with System;   use System;
with Widechar; use Widechar;

with System.Memory;

with Unchecked_Conversion;
with Unchecked_Deallocation;

package body Sinput is

   use ASCII;
   --  Make control characters visible

   First_Time_Around : Boolean := True;

   --  Routines to support conversion between types Lines_Table_Ptr,
   --  Logical_Lines_Table_Ptr and System.Address.

   pragma Warnings (Off);
   --  These unchecked conversions are aliasing safe, since they are never
   --  used to construct improperly aliased pointer values.

   function To_Address is
     new Unchecked_Conversion (Lines_Table_Ptr, Address);

   function To_Address is
     new Unchecked_Conversion (Logical_Lines_Table_Ptr, Address);

   function To_Pointer is
     new Unchecked_Conversion (Address, Lines_Table_Ptr);

   function To_Pointer is
     new Unchecked_Conversion (Address, Logical_Lines_Table_Ptr);

   pragma Warnings (On);

   ---------------------------
   -- Add_Line_Tables_Entry --
   ---------------------------

   procedure Add_Line_Tables_Entry
     (S : in out Source_File_Record;
      P : Source_Ptr)
   is
      LL : Physical_Line_Number;

   begin
      --  Reallocate the lines tables if necessary.

      --  Note: the reason we do not use the normal Table package
      --  mechanism is that we have several of these tables. We could
      --  use the new GNAT.Dynamic_Tables package and that would probably
      --  be a good idea ???

      if S.Last_Source_Line = S.Lines_Table_Max then
         Alloc_Line_Tables
           (S,
            Int (S.Last_Source_Line) *
              ((100 + Alloc.Lines_Increment) / 100));

         if Debug_Flag_D then
            Write_Str ("--> Reallocating lines table, size = ");
            Write_Int (Int (S.Lines_Table_Max));
            Write_Eol;
         end if;
      end if;

      S.Last_Source_Line := S.Last_Source_Line + 1;
      LL := S.Last_Source_Line;

      S.Lines_Table (LL) := P;

      --  Deal with setting new entry in logical lines table if one is
      --  present. Note that there is always space (because the call to
      --  Alloc_Line_Tables makes sure both tables are the same length),

      if S.Logical_Lines_Table /= null then

         --  We can always set the entry from the previous one, because
         --  the processing for a Source_Reference pragma ensures that
         --  at least one entry following the pragma is set up correctly.

         S.Logical_Lines_Table (LL) := S.Logical_Lines_Table (LL - 1) + 1;
      end if;
   end Add_Line_Tables_Entry;

   -----------------------
   -- Alloc_Line_Tables --
   -----------------------

   procedure Alloc_Line_Tables
     (S       : in out Source_File_Record;
      New_Max : Nat)
   is
      subtype size_t is Memory.size_t;

      New_Table : Lines_Table_Ptr;

      New_Logical_Table : Logical_Lines_Table_Ptr;

      New_Size : constant size_t :=
                   size_t (New_Max * Lines_Table_Type'Component_Size /
                                                             Storage_Unit);

   begin
      if S.Lines_Table = null then
         New_Table := To_Pointer (Memory.Alloc (New_Size));

      else
         New_Table :=
           To_Pointer (Memory.Realloc (To_Address (S.Lines_Table), New_Size));
      end if;

      if New_Table = null then
         raise Storage_Error;
      else
         S.Lines_Table     := New_Table;
         S.Lines_Table_Max := Physical_Line_Number (New_Max);
      end if;

      if S.Num_SRef_Pragmas /= 0 then
         if S.Logical_Lines_Table = null then
            New_Logical_Table := To_Pointer (Memory.Alloc (New_Size));
         else
            New_Logical_Table := To_Pointer
              (Memory.Realloc (To_Address (S.Logical_Lines_Table), New_Size));
         end if;

         if New_Logical_Table = null then
            raise Storage_Error;
         else
            S.Logical_Lines_Table := New_Logical_Table;
         end if;
      end if;
   end Alloc_Line_Tables;

   -----------------
   -- Backup_Line --
   -----------------

   procedure Backup_Line (P : in out Source_Ptr) is
      Sindex : constant Source_File_Index := Get_Source_File_Index (P);
      Src    : constant Source_Buffer_Ptr :=
                 Source_File.Table (Sindex).Source_Text;
      Sfirst : constant Source_Ptr :=
                 Source_File.Table (Sindex).Source_First;

   begin
      P := P - 1;

      if P = Sfirst then
         return;
      end if;

      if Src (P) = CR then
         if Src (P - 1) = LF then
            P := P - 1;
         end if;

      else -- Src (P) = LF
         if Src (P - 1) = CR then
            P := P - 1;
         end if;
      end if;

      --  Now find first character of the previous line

      while P > Sfirst
        and then Src (P - 1) /= LF
        and then Src (P - 1) /= CR
      loop
         P := P - 1;
      end loop;
   end Backup_Line;

   ---------------------------
   -- Build_Location_String --
   ---------------------------

   procedure Build_Location_String (Loc : Source_Ptr) is
      Ptr : Source_Ptr;

   begin
      Name_Len := 0;

      --  Loop through instantiations

      Ptr := Loc;
      loop
         Get_Name_String_And_Append
           (Reference_Name (Get_Source_File_Index (Ptr)));
         Add_Char_To_Name_Buffer (':');
         Add_Nat_To_Name_Buffer
           (Nat (Get_Logical_Line_Number (Ptr)));

         Ptr := Instantiation_Location (Ptr);
         exit when Ptr = No_Location;
         Add_Str_To_Name_Buffer (" instantiated at ");
      end loop;

      Name_Buffer (Name_Len + 1) := NUL;
      return;
   end Build_Location_String;

   -----------------------
   -- Get_Column_Number --
   -----------------------

   function Get_Column_Number (P : Source_Ptr) return Column_Number is
      S      : Source_Ptr;
      C      : Column_Number;
      Sindex : Source_File_Index;
      Src    : Source_Buffer_Ptr;

   begin
      --  If the input source pointer is not a meaningful value then return
      --  at once with column number 1. This can happen for a file not found
      --  condition for a file loaded indirectly by RTE, and also perhaps on
      --  some unknown internal error conditions. In either case we certainly
      --  don't want to blow up.

      if P < 1 then
         return 1;

      else
         Sindex := Get_Source_File_Index (P);
         Src := Source_File.Table (Sindex).Source_Text;
         S := Line_Start (P);
         C := 1;

         while S < P loop
            if Src (S) = HT then
               C := (C - 1) / 8 * 8 + (8 + 1);
            else
               C := C + 1;
            end if;

            S := S + 1;
         end loop;

         return C;
      end if;
   end Get_Column_Number;

   -----------------------------
   -- Get_Logical_Line_Number --
   -----------------------------

   function Get_Logical_Line_Number
     (P    : Source_Ptr)
      return Logical_Line_Number
   is
      SFR : Source_File_Record
              renames Source_File.Table (Get_Source_File_Index (P));

      L : constant Physical_Line_Number := Get_Physical_Line_Number (P);

   begin
      if SFR.Num_SRef_Pragmas = 0 then
         return Logical_Line_Number (L);
      else
         return SFR.Logical_Lines_Table (L);
      end if;
   end Get_Logical_Line_Number;

   ------------------------------
   -- Get_Physical_Line_Number --
   ------------------------------

   function Get_Physical_Line_Number
     (P    : Source_Ptr)
      return Physical_Line_Number
   is
      Sfile : Source_File_Index;
      Table : Lines_Table_Ptr;
      Lo    : Physical_Line_Number;
      Hi    : Physical_Line_Number;
      Mid   : Physical_Line_Number;
      Loc   : Source_Ptr;

   begin
      --  If the input source pointer is not a meaningful value then return
      --  at once with line number 1. This can happen for a file not found
      --  condition for a file loaded indirectly by RTE, and also perhaps on
      --  some unknown internal error conditions. In either case we certainly
      --  don't want to blow up.

      if P < 1 then
         return 1;

      --  Otherwise we can do the binary search

      else
         Sfile := Get_Source_File_Index (P);
         Loc   := P + Source_File.Table (Sfile).Sloc_Adjust;
         Table := Source_File.Table (Sfile).Lines_Table;
         Lo    := 1;
         Hi    := Source_File.Table (Sfile).Last_Source_Line;

         loop
            Mid := (Lo + Hi) / 2;

            if Loc < Table (Mid) then
               Hi := Mid - 1;

            else -- Loc >= Table (Mid)

               if Mid = Hi or else
                  Loc < Table (Mid + 1)
               then
                  return Mid;
               else
                  Lo := Mid + 1;
               end if;

            end if;

         end loop;
      end if;
   end Get_Physical_Line_Number;

   ---------------------------
   -- Get_Source_File_Index --
   ---------------------------

   Source_Cache_First : Source_Ptr := 1;
   Source_Cache_Last  : Source_Ptr := 0;
   --  Records the First and Last subscript values for the most recently
   --  referenced entry in the source table, to optimize the common case
   --  of repeated references to the same entry. The initial values force
   --  an initial search to set the cache value.

   Source_Cache_Index : Source_File_Index := No_Source_File;
   --  Contains the index of the entry corresponding to Source_Cache

   function Get_Source_File_Index
     (S    : Source_Ptr)
      return Source_File_Index
   is
   begin
      if S in Source_Cache_First .. Source_Cache_Last then
         return Source_Cache_Index;

      else
         for J in Source_File_Index_Table (Int (S) / Chunk_Size)
                                                    .. Source_File.Last
         loop
            if S in Source_File.Table (J).Source_First ..
                    Source_File.Table (J).Source_Last
            then
               Source_Cache_Index := J;
               Source_Cache_First :=
                 Source_File.Table (Source_Cache_Index).Source_First;
               Source_Cache_Last :=
                 Source_File.Table (Source_Cache_Index).Source_Last;
               return Source_Cache_Index;
            end if;
         end loop;
      end if;

      --  We must find a matching entry in the above loop!

      raise Program_Error;
   end Get_Source_File_Index;

   ----------------
   -- Initialize --
   ----------------

   procedure Initialize is
   begin
      Source_Cache_First := 1;
      Source_Cache_Last  := 0;
      Source_Cache_Index := No_Source_File;
      Source_gnat_adc    := No_Source_File;
      First_Time_Around  := True;

      Source_File.Init;
   end Initialize;

   -------------------------
   -- Instantiation_Depth --
   -------------------------

   function Instantiation_Depth (S : Source_Ptr) return Nat is
      Sind  : Source_File_Index;
      Sval  : Source_Ptr;
      Depth : Nat;

   begin
      Sval := S;
      Depth := 0;

      loop
         Sind := Get_Source_File_Index (Sval);
         Sval := Instantiation (Sind);
         exit when Sval = No_Location;
         Depth := Depth + 1;
      end loop;

      return Depth;
   end Instantiation_Depth;

   ----------------------------
   -- Instantiation_Location --
   ----------------------------

   function Instantiation_Location (S : Source_Ptr) return Source_Ptr is
   begin
      return Instantiation (Get_Source_File_Index (S));
   end Instantiation_Location;

   ----------------------
   -- Last_Source_File --
   ----------------------

   function Last_Source_File return Source_File_Index is
   begin
      return Source_File.Last;
   end Last_Source_File;

   ----------------
   -- Line_Start --
   ----------------

   function Line_Start (P : Source_Ptr) return Source_Ptr is
      Sindex : constant Source_File_Index := Get_Source_File_Index (P);
      Src    : constant Source_Buffer_Ptr :=
                 Source_File.Table (Sindex).Source_Text;
      Sfirst : constant Source_Ptr :=
                 Source_File.Table (Sindex).Source_First;
      S      : Source_Ptr;

   begin
      S := P;

      while S > Sfirst
        and then Src (S - 1) /= CR
        and then Src (S - 1) /= LF
      loop
         S := S - 1;
      end loop;

      return S;
   end Line_Start;

   function Line_Start
     (L    : Physical_Line_Number;
      S    : Source_File_Index)
      return Source_Ptr
   is
   begin
      return Source_File.Table (S).Lines_Table (L);
   end Line_Start;

   ----------
   -- Lock --
   ----------

   procedure Lock is
   begin
      Source_File.Locked := True;
      Source_File.Release;
   end Lock;

   ----------------------
   -- Num_Source_Files --
   ----------------------

   function Num_Source_Files return Nat is
   begin
      return Int (Source_File.Last) - Int (Source_File.First) + 1;
   end Num_Source_Files;

   ----------------------
   -- Num_Source_Lines --
   ----------------------

   function Num_Source_Lines (S : Source_File_Index) return Nat is
   begin
      return Nat (Source_File.Table (S).Last_Source_Line);
   end Num_Source_Lines;

   -----------------------
   -- Original_Location --
   -----------------------

   function Original_Location (S : Source_Ptr) return Source_Ptr is
      Sindex : Source_File_Index;
      Tindex : Source_File_Index;

   begin
      if S <= No_Location then
         return S;

      else
         Sindex := Get_Source_File_Index (S);

         if Instantiation (Sindex) = No_Location then
            return S;

         else
            Tindex := Template (Sindex);
            while Instantiation (Tindex) /= No_Location loop
               Tindex := Template (Tindex);
            end loop;

            return S - Source_First (Sindex) + Source_First (Tindex);
         end if;
      end if;
   end Original_Location;

   -------------------------
   -- Physical_To_Logical --
   -------------------------

   function Physical_To_Logical
     (Line : Physical_Line_Number;
      S    : Source_File_Index)
      return Logical_Line_Number
   is
      SFR : Source_File_Record renames Source_File.Table (S);

   begin
      if SFR.Num_SRef_Pragmas = 0 then
         return Logical_Line_Number (Line);
      else
         return SFR.Logical_Lines_Table (Line);
      end if;
   end Physical_To_Logical;

   --------------------------------
   -- Register_Source_Ref_Pragma --
   --------------------------------

   procedure Register_Source_Ref_Pragma
     (File_Name          : Name_Id;
      Stripped_File_Name : Name_Id;
      Mapped_Line        : Nat;
      Line_After_Pragma  : Physical_Line_Number)
   is
      subtype size_t is Memory.size_t;

      SFR : Source_File_Record renames Source_File.Table (Current_Source_File);

      ML : Logical_Line_Number;

   begin
      if File_Name /= No_Name then
         SFR.Reference_Name := Stripped_File_Name;
         SFR.Full_Ref_Name  := File_Name;

         if not Debug_Generated_Code then
            SFR.Debug_Source_Name := Stripped_File_Name;
            SFR.Full_Debug_Name   := File_Name;
         end if;

         SFR.Num_SRef_Pragmas := SFR.Num_SRef_Pragmas + 1;
      end if;

      if SFR.Num_SRef_Pragmas = 1 then
         SFR.First_Mapped_Line := Logical_Line_Number (Mapped_Line);
      end if;

      if SFR.Logical_Lines_Table = null then
         SFR.Logical_Lines_Table := To_Pointer
           (Memory.Alloc
             (size_t (SFR.Lines_Table_Max *
                        Logical_Lines_Table_Type'Component_Size /
                                                        Storage_Unit)));
      end if;

      SFR.Logical_Lines_Table (Line_After_Pragma - 1) := No_Line_Number;

      ML := Logical_Line_Number (Mapped_Line);
      for J in Line_After_Pragma .. SFR.Last_Source_Line loop
         SFR.Logical_Lines_Table (J) := ML;
         ML := ML + 1;
      end loop;
   end Register_Source_Ref_Pragma;

   ---------------------------------
   -- Set_Source_File_Index_Table --
   ---------------------------------

   procedure Set_Source_File_Index_Table (Xnew : Source_File_Index) is
      Ind : Int;
      SP  : Source_Ptr;
      SL  : constant Source_Ptr := Source_File.Table (Xnew).Source_Last;

   begin
      SP  := (Source_File.Table (Xnew).Source_First + Chunk_Size - 1)
                                                    / Chunk_Size * Chunk_Size;
      Ind := Int (SP) / Chunk_Size;

      while SP <= SL loop
         Source_File_Index_Table (Ind) := Xnew;
         SP := SP + Chunk_Size;
         Ind := Ind + 1;
      end loop;
   end Set_Source_File_Index_Table;

   ---------------------------
   -- Skip_Line_Terminators --
   ---------------------------

   procedure Skip_Line_Terminators
     (P        : in out Source_Ptr;
      Physical : out Boolean)
   is
      Chr : constant Character := Source (P);

   begin
      if  Chr = CR then
         if Source (P + 1) = LF then
            P := P + 2;
         else
            P := P + 1;
         end if;

      elsif Chr = LF then
         if Source (P) = CR then
            P := P + 2;
         else
            P := P + 1;
         end if;

      elsif Chr = FF or else Chr = VT then
         P := P + 1;
         Physical := False;
         return;

         --  Otherwise we have a wide character

      else
         Skip_Wide (Source, P);
      end if;

      --  Fall through in the physical line terminator case. First deal with
      --  making a possible entry into the lines table if one is needed.

      --  Note: we are dealing with a real source file here, this cannot be
      --  the instantiation case, so we need not worry about Sloc adjustment.

      declare
         S : Source_File_Record
               renames Source_File.Table (Current_Source_File);

      begin
         Physical := True;

         --  Make entry in lines table if not already made (in some scan backup
         --  cases, we will be rescanning previously scanned source, so the
         --  entry may have already been made on the previous forward scan).

         if Source (P) /= EOF
           and then P > S.Lines_Table (S.Last_Source_Line)
         then
            Add_Line_Tables_Entry (S, P);
         end if;
      end;
   end Skip_Line_Terminators;

   -------------------
   -- Source_Offset --
   -------------------

   function Source_Offset (S : Source_Ptr) return Nat is
      Sindex : constant Source_File_Index := Get_Source_File_Index (S);
      Sfirst : constant Source_Ptr :=
                 Source_File.Table (Sindex).Source_First;

   begin
      return Nat (S - Sfirst);
   end Source_Offset;

   ------------------------
   -- Top_Level_Location --
   ------------------------

   function Top_Level_Location (S : Source_Ptr) return Source_Ptr is
      Oldloc : Source_Ptr;
      Newloc : Source_Ptr;

   begin
      Newloc := S;
      loop
         Oldloc := Newloc;
         Newloc := Instantiation_Location (Oldloc);
         exit when Newloc = No_Location;
      end loop;

      return Oldloc;
   end Top_Level_Location;

   ---------------
   -- Tree_Read --
   ---------------

   procedure Tree_Read is
   begin
      --  First we must free any old source buffer pointers

      if not First_Time_Around then
         for J in Source_File.First .. Source_File.Last loop
            declare
               S : Source_File_Record renames Source_File.Table (J);

               procedure Free_Ptr is new Unchecked_Deallocation
                 (Big_Source_Buffer, Source_Buffer_Ptr);

               pragma Warnings (Off);
               --  This unchecked conversion is aliasing safe, since it is not
               --  used to create improperly aliased pointer values.

               function To_Source_Buffer_Ptr is new
                 Unchecked_Conversion (Address, Source_Buffer_Ptr);

               pragma Warnings (On);

               Tmp1 : Source_Buffer_Ptr;

            begin
               if S.Instantiation /= No_Location then
                  null;

               else
                  --  We have to recreate a proper pointer to the actual array
                  --  from the zero origin pointer stored in the source table.

                  Tmp1 :=
                    To_Source_Buffer_Ptr
                      (S.Source_Text (S.Source_First)'Address);
                  Free_Ptr (Tmp1);

                  --  Note: we are using free here, because we used malloc
                  --  or realloc directly to allocate the tables. That is
                  --  because we were playing the big array trick.

                  if S.Lines_Table /= null then
                     Memory.Free (To_Address (S.Lines_Table));
                     S.Lines_Table := null;
                  end if;

                  if S.Logical_Lines_Table /= null then
                     Memory.Free (To_Address (S.Logical_Lines_Table));
                     S.Logical_Lines_Table := null;
                  end if;
               end if;
            end;
         end loop;
      end if;

      --  Reset source cache pointers to force new read

      Source_Cache_First := 1;
      Source_Cache_Last  := 0;

      --  Read in source file table

      Source_File.Tree_Read;

      --  The pointers we read in there for the source buffer and lines
      --  table pointers are junk. We now read in the actual data that
      --  is referenced by these two fields.

      for J in Source_File.First .. Source_File.Last loop
         declare
            S : Source_File_Record renames Source_File.Table (J);

         begin
            --  For the instantiation case, we do not read in any data. Instead
            --  we share the data for the generic template entry. Since the
            --  template always occurs first, we can safetly refer to its data.

            if S.Instantiation /= No_Location then
               declare
                  ST : Source_File_Record renames
                         Source_File.Table (S.Template);

               begin
                  --  The lines tables are copied from the template entry

                  S.Lines_Table :=
                    Source_File.Table (S.Template).Lines_Table;
                  S.Logical_Lines_Table :=
                    Source_File.Table (S.Template).Logical_Lines_Table;

                  --  In the case of the source table pointer, we share the
                  --  same data as the generic template, but the virtual origin
                  --  is adjusted. For example, if the first subscript of the
                  --  template is 100, and that of the instantiation is 200,
                  --  then the instantiation pointer is obtained by subtracting
                  --  100 from the template pointer.

                  declare
                     pragma Suppress (All_Checks);

                     pragma Warnings (Off);
                     --  This unchecked conversion is aliasing safe since it
                     --  not used to create improperly aliased pointer values.

                     function To_Source_Buffer_Ptr is new
                       Unchecked_Conversion (Address, Source_Buffer_Ptr);

                     pragma Warnings (On);

                  begin
                     S.Source_Text :=
                       To_Source_Buffer_Ptr
                          (ST.Source_Text
                            (ST.Source_First - S.Source_First)'Address);
                  end;
               end;

            --  Normal case (non-instantiation)

            else
               First_Time_Around := False;
               S.Lines_Table := null;
               S.Logical_Lines_Table := null;
               Alloc_Line_Tables (S, Int (S.Last_Source_Line));

               for J in 1 .. S.Last_Source_Line loop
                  Tree_Read_Int (Int (S.Lines_Table (J)));
               end loop;

               if S.Num_SRef_Pragmas /= 0 then
                  for J in 1 .. S.Last_Source_Line loop
                     Tree_Read_Int (Int (S.Logical_Lines_Table (J)));
                  end loop;
               end if;

               --  Allocate source buffer and read in the data and then set the
               --  virtual origin to point to the logical zero'th element. This
               --  address must be computed with subscript checks turned off.

               declare
                  subtype B is Text_Buffer (S.Source_First .. S.Source_Last);
                  type Text_Buffer_Ptr is access B;
                  T : Text_Buffer_Ptr;

                  pragma Suppress (All_Checks);

                  pragma Warnings (Off);
                  --  This unchecked conversion is aliasing safe, since it is
                  --  never used to create improperly aliased pointer values.

                  function To_Source_Buffer_Ptr is new
                    Unchecked_Conversion (Address, Source_Buffer_Ptr);

                  pragma Warnings (On);

               begin
                  T := new B;

                  Tree_Read_Data (T (S.Source_First)'Address,
                     Int (S.Source_Last) - Int (S.Source_First) + 1);

                  S.Source_Text := To_Source_Buffer_Ptr (T (0)'Address);
               end;
            end if;
         end;

         Set_Source_File_Index_Table (J);
      end loop;
   end Tree_Read;

   ----------------
   -- Tree_Write --
   ----------------

   procedure Tree_Write is
   begin
      Source_File.Tree_Write;

      --  The pointers we wrote out there for the source buffer and lines
      --  table pointers are junk, we now write out the actual data that
      --  is referenced by these two fields.

      for J in Source_File.First .. Source_File.Last loop
         declare
            S : Source_File_Record renames Source_File.Table (J);

         begin
            --  For instantiations, there is nothing to do, since the data is
            --  shared with the generic template. When the tree is read, the
            --  pointers must be set, but no extra data needs to be written.

            if S.Instantiation /= No_Location then
               null;

            --  For the normal case, write out the data of the tables

            else
               --  Lines table

               for J in 1 .. S.Last_Source_Line loop
                  Tree_Write_Int (Int (S.Lines_Table (J)));
               end loop;

               --  Logical lines table if present

               if S.Num_SRef_Pragmas /= 0 then
                  for J in 1 .. S.Last_Source_Line loop
                     Tree_Write_Int (Int (S.Logical_Lines_Table (J)));
                  end loop;
               end if;

               --  Source buffer

               Tree_Write_Data
                 (S.Source_Text (S.Source_First)'Address,
                   Int (S.Source_Last) - Int (S.Source_First) + 1);
            end if;
         end;
      end loop;
   end Tree_Write;

   --------------------
   -- Write_Location --
   --------------------

   procedure Write_Location (P : Source_Ptr) is
   begin
      if P = No_Location then
         Write_Str ("<no location>");

      elsif P <= Standard_Location then
         Write_Str ("<standard location>");

      else
         declare
            SI : constant Source_File_Index := Get_Source_File_Index (P);

         begin
            Write_Name (Debug_Source_Name (SI));
            Write_Char (':');
            Write_Int (Int (Get_Logical_Line_Number (P)));
            Write_Char (':');
            Write_Int (Int (Get_Column_Number (P)));

            if Instantiation (SI) /= No_Location then
               Write_Str (" [");
               Write_Location (Instantiation (SI));
               Write_Char (']');
            end if;
         end;
      end if;
   end Write_Location;

   ----------------------
   -- Write_Time_Stamp --
   ----------------------

   procedure Write_Time_Stamp (S : Source_File_Index) is
      T : constant Time_Stamp_Type := Time_Stamp (S);
      P : Natural;

   begin
      if T (1) = '9' then
         Write_Str ("19");
         P := 0;
      else
         Write_Char (T (1));
         Write_Char (T (2));
         P := 2;
      end if;

      Write_Char (T (P + 1));
      Write_Char (T (P + 2));
      Write_Char ('-');

      Write_Char (T (P + 3));
      Write_Char (T (P + 4));
      Write_Char ('-');

      Write_Char (T (P + 5));
      Write_Char (T (P + 6));
      Write_Char (' ');

      Write_Char (T (P + 7));
      Write_Char (T (P + 8));
      Write_Char (':');

      Write_Char (T (P + 9));
      Write_Char (T (P + 10));
      Write_Char (':');

      Write_Char (T (P + 11));
      Write_Char (T (P + 12));
   end Write_Time_Stamp;

   ----------------------------------------------
   -- Access Subprograms for Source File Table --
   ----------------------------------------------

   function Debug_Source_Name (S : SFI) return File_Name_Type is
   begin
      return Source_File.Table (S).Debug_Source_Name;
   end Debug_Source_Name;

   function File_Name (S : SFI) return File_Name_Type is
   begin
      return Source_File.Table (S).File_Name;
   end File_Name;

   function File_Type (S : SFI) return Type_Of_File is
   begin
      return Source_File.Table (S).File_Type;
   end File_Type;

   function First_Mapped_Line (S : SFI) return Logical_Line_Number is
   begin
      return Source_File.Table (S).First_Mapped_Line;
   end First_Mapped_Line;

   function Full_Debug_Name (S : SFI) return File_Name_Type is
   begin
      return Source_File.Table (S).Full_Debug_Name;
   end Full_Debug_Name;

   function Full_File_Name (S : SFI) return File_Name_Type is
   begin
      return Source_File.Table (S).Full_File_Name;
   end Full_File_Name;

   function Full_Ref_Name (S : SFI) return File_Name_Type is
   begin
      return Source_File.Table (S).Full_Ref_Name;
   end Full_Ref_Name;

   function Identifier_Casing (S : SFI) return Casing_Type is
   begin
      return Source_File.Table (S).Identifier_Casing;
   end Identifier_Casing;

   function Inlined_Body (S : SFI) return Boolean is
   begin
      return Source_File.Table (S).Inlined_Body;
   end Inlined_Body;

   function Instantiation (S : SFI) return Source_Ptr is
   begin
      return Source_File.Table (S).Instantiation;
   end Instantiation;

   function Keyword_Casing (S : SFI) return Casing_Type is
   begin
      return Source_File.Table (S).Keyword_Casing;
   end Keyword_Casing;

   function Last_Source_Line (S : SFI) return Physical_Line_Number is
   begin
      return Source_File.Table (S).Last_Source_Line;
   end Last_Source_Line;

   function License (S : SFI) return License_Type is
   begin
      return Source_File.Table (S).License;
   end License;

   function Num_SRef_Pragmas (S : SFI) return Nat is
   begin
      return Source_File.Table (S).Num_SRef_Pragmas;
   end Num_SRef_Pragmas;

   function Reference_Name (S : SFI) return File_Name_Type is
   begin
      return Source_File.Table (S).Reference_Name;
   end Reference_Name;

   function Source_Checksum (S : SFI) return Word is
   begin
      return Source_File.Table (S).Source_Checksum;
   end Source_Checksum;

   function Source_First (S : SFI) return Source_Ptr is
   begin
      if S = Internal_Source_File then
         return Internal_Source'First;
      else
         return Source_File.Table (S).Source_First;
      end if;
   end Source_First;

   function Source_Last (S : SFI) return Source_Ptr is
   begin
      if S = Internal_Source_File then
         return Internal_Source'Last;
      else
         return Source_File.Table (S).Source_Last;
      end if;

   end Source_Last;

   function Source_Text (S : SFI) return Source_Buffer_Ptr is
   begin
      if S = Internal_Source_File then
         return Internal_Source_Ptr;
      else
         return Source_File.Table (S).Source_Text;
      end if;

   end Source_Text;

   function Template (S : SFI) return SFI is
   begin
      return Source_File.Table (S).Template;
   end Template;

   function Time_Stamp (S : SFI) return Time_Stamp_Type is
   begin
      return Source_File.Table (S).Time_Stamp;
   end Time_Stamp;

   ------------------------------------------
   -- Set Procedures for Source File Table --
   ------------------------------------------

   procedure Set_Identifier_Casing (S : SFI; C : Casing_Type) is
   begin
      Source_File.Table (S).Identifier_Casing := C;
   end Set_Identifier_Casing;

   procedure Set_Keyword_Casing (S : SFI; C : Casing_Type) is
   begin
      Source_File.Table (S).Keyword_Casing := C;
   end Set_Keyword_Casing;

   procedure Set_License (S : SFI; L : License_Type) is
   begin
      Source_File.Table (S).License := L;
   end Set_License;

   ----------------------
   -- Trim_Lines_Table --
   ----------------------

   procedure Trim_Lines_Table (S : Source_File_Index) is
      Max : constant Nat := Nat (Source_File.Table (S).Last_Source_Line);

   begin
      --  Release allocated storage that is no longer needed

      Source_File.Table (S).Lines_Table := To_Pointer
        (Memory.Realloc
          (To_Address (Source_File.Table (S).Lines_Table),
           Memory.size_t
            (Max * (Lines_Table_Type'Component_Size / System.Storage_Unit))));
      Source_File.Table (S).Lines_Table_Max := Physical_Line_Number (Max);
   end Trim_Lines_Table;

   --------
   -- wl --
   --------

   procedure wl (P : Source_Ptr) is
   begin
      Write_Location (P);
      Write_Eol;
   end wl;

end Sinput;
OpenPOWER on IntegriCloud