aboutsummaryrefslogtreecommitdiff
path: root/gdb/language.c
blob: ee0101db74af2cb108b4e053dbdbc699d847639a (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
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
/* Multiple source language support for GDB.

   Copyright (C) 1991-2017 Free Software Foundation, Inc.

   Contributed by the Department of Computer Science at the State University
   of New York at Buffalo.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT 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
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This file contains functions that return things that are specific
   to languages.  Each function should examine current_language if necessary,
   and return the appropriate result.  */

/* FIXME:  Most of these would be better organized as macros which
   return data out of a "language-specific" struct pointer that is set
   whenever the working language changes.  That would be a lot faster.  */

#include "defs.h"
#include <ctype.h>
#include "symtab.h"
#include "gdbtypes.h"
#include "value.h"
#include "gdbcmd.h"
#include "expression.h"
#include "language.h"
#include "varobj.h"
#include "target.h"
#include "parser-defs.h"
#include "demangle.h"
#include "symfile.h"
#include "cp-support.h"
#include "frame.h"

extern void _initialize_language (void);

static void unk_lang_error (const char *);

static int unk_lang_parser (struct parser_state *);

static void show_check (char *, int);

static void set_check (char *, int);

static void set_range_case (void);

static void unk_lang_emit_char (int c, struct type *type,
				struct ui_file *stream, int quoter);

static void unk_lang_printchar (int c, struct type *type,
				struct ui_file *stream);

static void unk_lang_value_print (struct value *, struct ui_file *,
				  const struct value_print_options *);

static CORE_ADDR unk_lang_trampoline (struct frame_info *, CORE_ADDR pc);

/* Forward declaration */
extern const struct language_defn unknown_language_defn;

/* The current (default at startup) state of type and range checking.
   (If the modes are set to "auto", though, these are changed based
   on the default language at startup, and then again based on the
   language of the first source file.  */

enum range_mode range_mode = range_mode_auto;
enum range_check range_check = range_check_off;
enum case_mode case_mode = case_mode_auto;
enum case_sensitivity case_sensitivity = case_sensitive_on;

/* The current language and language_mode (see language.h).  */

const struct language_defn *current_language = &unknown_language_defn;
enum language_mode language_mode = language_mode_auto;

/* The language that the user expects to be typing in (the language
   of main(), or the last language we notified them about, or C).  */

const struct language_defn *expected_language;

/* The list of supported languages.  The list itself is malloc'd.  */

static const struct language_defn **languages;
static unsigned languages_size;
static unsigned languages_allocsize;
#define	DEFAULT_ALLOCSIZE 4

/* The current values of the "set language/type/range" enum
   commands.  */
static const char *language;
static const char *type;
static const char *range;
static const char *case_sensitive;

/* Warning issued when current_language and the language of the current
   frame do not match.  */
char lang_frame_mismatch_warn[] =
"Warning: the current language does not match this frame.";

/* This page contains the functions corresponding to GDB commands
   and their helpers.  */

/* Show command.  Display a warning if the language set
   does not match the frame.  */
static void
show_language_command (struct ui_file *file, int from_tty,
		       struct cmd_list_element *c, const char *value)
{
  enum language flang;		/* The language of the frame.  */

  if (language_mode == language_mode_auto)
    fprintf_filtered (gdb_stdout,
		      _("The current source language is "
			"\"auto; currently %s\".\n"),
		      current_language->la_name);
  else
    fprintf_filtered (gdb_stdout,
		      _("The current source language is \"%s\".\n"),
		      current_language->la_name);

  if (has_stack_frames ())
    {
      struct frame_info *frame;

      frame = get_selected_frame (NULL);
      flang = get_frame_language (frame);
      if (flang != language_unknown
	  && language_mode == language_mode_manual
	  && current_language->la_language != flang)
	printf_filtered ("%s\n", lang_frame_mismatch_warn);
    }
}

/* Set command.  Change the current working language.  */
static void
set_language_command (char *ignore, int from_tty, struct cmd_list_element *c)
{
  int i;
  enum language flang = language_unknown;

  /* Search the list of languages for a match.  */
  for (i = 0; i < languages_size; i++)
    {
      if (strcmp (languages[i]->la_name, language) == 0)
	{
	  /* Found it!  Go into manual mode, and use this language.  */
	  if (languages[i]->la_language == language_auto)
	    {
	      /* Enter auto mode.  Set to the current frame's language, if
                 known, or fallback to the initial language.  */
	      language_mode = language_mode_auto;
	      TRY
		{
		  struct frame_info *frame;

		  frame = get_selected_frame (NULL);
		  flang = get_frame_language (frame);
		}
	      CATCH (ex, RETURN_MASK_ERROR)
		{
		  flang = language_unknown;
		}
	      END_CATCH

	      if (flang != language_unknown)
		set_language (flang);
	      else
		set_initial_language ();
	      expected_language = current_language;
	      return;
	    }
	  else
	    {
	      /* Enter manual mode.  Set the specified language.  */
	      language_mode = language_mode_manual;
	      current_language = languages[i];
	      set_range_case ();
	      expected_language = current_language;
	      return;
	    }
	}
    }

  internal_error (__FILE__, __LINE__,
		  "Couldn't find language `%s' in known languages list.",
		  language);
}

/* Show command.  Display a warning if the range setting does
   not match the current language.  */
static void
show_range_command (struct ui_file *file, int from_tty,
		    struct cmd_list_element *c, const char *value)
{
  if (range_mode == range_mode_auto)
    {
      const char *tmp;

      switch (range_check)
	{
	case range_check_on:
	  tmp = "on";
	  break;
	case range_check_off:
	  tmp = "off";
	  break;
	case range_check_warn:
	  tmp = "warn";
	  break;
	default:
	  internal_error (__FILE__, __LINE__,
			  "Unrecognized range check setting.");
	}

      fprintf_filtered (gdb_stdout,
			_("Range checking is \"auto; currently %s\".\n"),
			tmp);
    }
  else
    fprintf_filtered (gdb_stdout, _("Range checking is \"%s\".\n"),
		      value);

  if (range_check != current_language->la_range_check)
    warning (_("the current range check setting "
	       "does not match the language.\n"));
}

/* Set command.  Change the setting for range checking.  */
static void
set_range_command (char *ignore, int from_tty, struct cmd_list_element *c)
{
  if (strcmp (range, "on") == 0)
    {
      range_check = range_check_on;
      range_mode = range_mode_manual;
    }
  else if (strcmp (range, "warn") == 0)
    {
      range_check = range_check_warn;
      range_mode = range_mode_manual;
    }
  else if (strcmp (range, "off") == 0)
    {
      range_check = range_check_off;
      range_mode = range_mode_manual;
    }
  else if (strcmp (range, "auto") == 0)
    {
      range_mode = range_mode_auto;
      set_range_case ();
      return;
    }
  else
    {
      internal_error (__FILE__, __LINE__,
		      _("Unrecognized range check setting: \"%s\""), range);
    }
  if (range_check != current_language->la_range_check)
    warning (_("the current range check setting "
	       "does not match the language.\n"));
}

/* Show command.  Display a warning if the case sensitivity setting does
   not match the current language.  */
static void
show_case_command (struct ui_file *file, int from_tty,
		   struct cmd_list_element *c, const char *value)
{
  if (case_mode == case_mode_auto)
    {
      const char *tmp = NULL;

      switch (case_sensitivity)
	{
	case case_sensitive_on:
	  tmp = "on";
	  break;
	case case_sensitive_off:
	  tmp = "off";
	  break;
	default:
	  internal_error (__FILE__, __LINE__,
			  "Unrecognized case-sensitive setting.");
	}

      fprintf_filtered (gdb_stdout,
			_("Case sensitivity in "
			  "name search is \"auto; currently %s\".\n"),
			tmp);
    }
  else
    fprintf_filtered (gdb_stdout,
		      _("Case sensitivity in name search is \"%s\".\n"),
		      value);

  if (case_sensitivity != current_language->la_case_sensitivity)
    warning (_("the current case sensitivity setting does not match "
	       "the language.\n"));
}

/* Set command.  Change the setting for case sensitivity.  */

static void
set_case_command (char *ignore, int from_tty, struct cmd_list_element *c)
{
   if (strcmp (case_sensitive, "on") == 0)
     {
       case_sensitivity = case_sensitive_on;
       case_mode = case_mode_manual;
     }
   else if (strcmp (case_sensitive, "off") == 0)
     {
       case_sensitivity = case_sensitive_off;
       case_mode = case_mode_manual;
     }
   else if (strcmp (case_sensitive, "auto") == 0)
     {
       case_mode = case_mode_auto;
       set_range_case ();
       return;
     }
   else
     {
       internal_error (__FILE__, __LINE__,
		       "Unrecognized case-sensitive setting: \"%s\"",
		       case_sensitive);
     }

   if (case_sensitivity != current_language->la_case_sensitivity)
     warning (_("the current case sensitivity setting does not match "
		"the language.\n"));
}

/* Set the status of range and type checking and case sensitivity based on
   the current modes and the current language.
   If SHOW is non-zero, then print out the current language,
   type and range checking status.  */
static void
set_range_case (void)
{
  if (range_mode == range_mode_auto)
    range_check = current_language->la_range_check;

  if (case_mode == case_mode_auto)
    case_sensitivity = current_language->la_case_sensitivity;
}

/* Set current language to (enum language) LANG.  Returns previous
   language.  */

enum language
set_language (enum language lang)
{
  int i;
  enum language prev_language;

  prev_language = current_language->la_language;

  for (i = 0; i < languages_size; i++)
    {
      if (languages[i]->la_language == lang)
	{
	  current_language = languages[i];
	  set_range_case ();
	  break;
	}
    }

  return prev_language;
}


/* Print out the current language settings: language, range and
   type checking.  If QUIETLY, print only what has changed.  */

void
language_info (int quietly)
{
  if (quietly && expected_language == current_language)
    return;

  expected_language = current_language;
  printf_unfiltered (_("Current language:  %s\n"), language);
  show_language_command (NULL, 1, NULL, NULL);

  if (!quietly)
    {
      printf_unfiltered (_("Range checking:    %s\n"), range);
      show_range_command (NULL, 1, NULL, NULL);
      printf_unfiltered (_("Case sensitivity:  %s\n"), case_sensitive);
      show_case_command (NULL, 1, NULL, NULL);
    }
}


/* Returns non-zero if the value is a pointer type.  */
int
pointer_type (struct type *type)
{
  return TYPE_CODE (type) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (type);
}


/* This page contains functions that return info about
   (struct value) values used in GDB.  */

/* Returns non-zero if the value VAL represents a true value.  */
int
value_true (struct value *val)
{
  /* It is possible that we should have some sort of error if a non-boolean
     value is used in this context.  Possibly dependent on some kind of
     "boolean-checking" option like range checking.  But it should probably
     not depend on the language except insofar as is necessary to identify
     a "boolean" value (i.e. in C using a float, pointer, etc., as a boolean
     should be an error, probably).  */
  return !value_logical_not (val);
}

/* This page contains functions for the printing out of
   error messages that occur during type- and range-
   checking.  */

/* This is called when a language fails a range-check.  The
   first argument should be a printf()-style format string, and the
   rest of the arguments should be its arguments.  If range_check is
   range_check_on, an error is printed;  if range_check_warn, a warning;
   otherwise just the message.  */

void
range_error (const char *string,...)
{
  va_list args;

  va_start (args, string);
  switch (range_check)
    {
    case range_check_warn:
      vwarning (string, args);
      break;
    case range_check_on:
      verror (string, args);
      break;
    case range_check_off:
      /* FIXME: cagney/2002-01-30: Should this function print anything
         when range error is off?  */
      vfprintf_filtered (gdb_stderr, string, args);
      fprintf_filtered (gdb_stderr, "\n");
      break;
    default:
      internal_error (__FILE__, __LINE__, _("bad switch"));
    }
  va_end (args);
}


/* This page contains miscellaneous functions.  */

/* Return the language enum for a given language string.  */

enum language
language_enum (char *str)
{
  int i;

  for (i = 0; i < languages_size; i++)
    if (strcmp (languages[i]->la_name, str) == 0)
      return languages[i]->la_language;

  return language_unknown;
}

/* Return the language struct for a given language enum.  */

const struct language_defn *
language_def (enum language lang)
{
  int i;

  for (i = 0; i < languages_size; i++)
    {
      if (languages[i]->la_language == lang)
	{
	  return languages[i];
	}
    }
  return NULL;
}

/* Return the language as a string.  */
const char *
language_str (enum language lang)
{
  int i;

  for (i = 0; i < languages_size; i++)
    {
      if (languages[i]->la_language == lang)
	{
	  return languages[i]->la_name;
	}
    }
  return "Unknown";
}

static void
set_check (char *ignore, int from_tty)
{
  printf_unfiltered (
     "\"set check\" must be followed by the name of a check subcommand.\n");
  help_list (setchecklist, "set check ", all_commands, gdb_stdout);
}

static void
show_check (char *ignore, int from_tty)
{
  cmd_show_list (showchecklist, from_tty, "");
}

/* Add a language to the set of known languages.  */

void
add_language (const struct language_defn *lang)
{
  /* For the "set language" command.  */
  static const char **language_names = NULL;
  /* For the "help set language" command.  */

  if (lang->la_magic != LANG_MAGIC)
    {
      fprintf_unfiltered (gdb_stderr,
			  "Magic number of %s language struct wrong\n",
			  lang->la_name);
      internal_error (__FILE__, __LINE__,
		      _("failed internal consistency check"));
    }

  if (!languages)
    {
      languages_allocsize = DEFAULT_ALLOCSIZE;
      languages = XNEWVEC (const struct language_defn *, languages_allocsize);
    }
  if (languages_size >= languages_allocsize)
    {
      languages_allocsize *= 2;
      languages = (const struct language_defn **) xrealloc ((char *) languages,
				 languages_allocsize * sizeof (*languages));
    }
  languages[languages_size++] = lang;

  /* Build the language names array, to be used as enumeration in the
     set language" enum command.  */
  language_names = XRESIZEVEC (const char *, language_names,
			       languages_size + 1);

  for (int i = 0; i < languages_size; ++i)
    language_names[i] = languages[i]->la_name;
  language_names[languages_size] = NULL;

  /* Add the filename extensions.  */
  if (lang->la_filename_extensions != NULL)
    {
      int i;

      for (i = 0; lang->la_filename_extensions[i] != NULL; ++i)
	add_filename_language (lang->la_filename_extensions[i],
			       lang->la_language);
    }

  /* Build the "help set language" docs.  */
  string_file doc;

  doc.printf (_("Set the current source language.\n"
		"The currently understood settings are:\n\nlocal or "
		"auto    Automatic setting based on source file\n"));

  for (int i = 0; i < languages_size; ++i)
    {
      /* Already dealt with these above.  */
      if (languages[i]->la_language == language_unknown
	  || languages[i]->la_language == language_auto)
	continue;

      /* FIXME: i18n: for now assume that the human-readable name is
	 just a capitalization of the internal name.  */
      doc.printf ("%-16s Use the %c%s language\n",
		  languages[i]->la_name,
		  /* Capitalize first letter of language name.  */
		  toupper (languages[i]->la_name[0]),
		  languages[i]->la_name + 1);
    }

  add_setshow_enum_cmd ("language", class_support,
			(const char **) language_names,
			&language,
			doc.c_str (),
			_("Show the current source language."),
			NULL, set_language_command,
			show_language_command,
			&setlist, &showlist);
}

/* Iterate through all registered languages looking for and calling
   any non-NULL struct language_defn.skip_trampoline() functions.
   Return the result from the first that returns non-zero, or 0 if all
   `fail'.  */
CORE_ADDR 
skip_language_trampoline (struct frame_info *frame, CORE_ADDR pc)
{
  int i;

  for (i = 0; i < languages_size; i++)
    {
      if (languages[i]->skip_trampoline)
	{
	  CORE_ADDR real_pc = (languages[i]->skip_trampoline) (frame, pc);

	  if (real_pc)
	    return real_pc;
	}
    }

  return 0;
}

/* Return demangled language symbol, or NULL.
   FIXME: Options are only useful for certain languages and ignored
   by others, so it would be better to remove them here and have a
   more flexible demangler for the languages that need it.
   FIXME: Sometimes the demangler is invoked when we don't know the
   language, so we can't use this everywhere.  */
char *
language_demangle (const struct language_defn *current_language, 
				const char *mangled, int options)
{
  if (current_language != NULL && current_language->la_demangle)
    return current_language->la_demangle (mangled, options);
  return NULL;
}

/* See langauge.h.  */

int
language_sniff_from_mangled_name (const struct language_defn *lang,
				  const char *mangled, char **demangled)
{
  gdb_assert (lang != NULL);

  if (lang->la_sniff_from_mangled_name == NULL)
    {
      *demangled = NULL;
      return 0;
    }

  return lang->la_sniff_from_mangled_name (mangled, demangled);
}

/* Return class name from physname or NULL.  */
char *
language_class_name_from_physname (const struct language_defn *lang,
				   const char *physname)
{
  if (lang != NULL && lang->la_class_name_from_physname)
    return lang->la_class_name_from_physname (physname);
  return NULL;
}

/* Return non-zero if TYPE should be passed (and returned) by
   reference at the language level.  */
int
language_pass_by_reference (struct type *type)
{
  return current_language->la_pass_by_reference (type);
}

/* Return zero; by default, types are passed by value at the language
   level.  The target ABI may pass or return some structs by reference
   independent of this.  */
int
default_pass_by_reference (struct type *type)
{
  return 0;
}

/* Return the default string containing the list of characters
   delimiting words.  This is a reasonable default value that
   most languages should be able to use.  */

const char *
default_word_break_characters (void)
{
  return " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-";
}

/* Print the index of array elements using the C99 syntax.  */

void
default_print_array_index (struct value *index_value, struct ui_file *stream,
			   const struct value_print_options *options)
{
  fprintf_filtered (stream, "[");
  LA_VALUE_PRINT (index_value, stream, options);
  fprintf_filtered (stream, "] = ");
}

void
default_get_string (struct value *value, gdb_byte **buffer, int *length,
		    struct type **char_type, const char **charset)
{
  error (_("Getting a string is unsupported in this language."));
}

/* Define the language that is no language.  */

static int
unk_lang_parser (struct parser_state *ps)
{
  return 1;
}

static void
unk_lang_error (const char *msg)
{
  error (_("Attempted to parse an expression with unknown language"));
}

static void
unk_lang_emit_char (int c, struct type *type, struct ui_file *stream,
		    int quoter)
{
  error (_("internal error - unimplemented "
	   "function unk_lang_emit_char called."));
}

static void
unk_lang_printchar (int c, struct type *type, struct ui_file *stream)
{
  error (_("internal error - unimplemented "
	   "function unk_lang_printchar called."));
}

static void
unk_lang_printstr (struct ui_file *stream, struct type *type,
		   const gdb_byte *string, unsigned int length,
		   const char *encoding, int force_ellipses,
		   const struct value_print_options *options)
{
  error (_("internal error - unimplemented "
	   "function unk_lang_printstr called."));
}

static void
unk_lang_print_type (struct type *type, const char *varstring,
		     struct ui_file *stream, int show, int level,
		     const struct type_print_options *flags)
{
  error (_("internal error - unimplemented "
	   "function unk_lang_print_type called."));
}

static void
unk_lang_val_print (struct type *type,
		    int embedded_offset, CORE_ADDR address,
		    struct ui_file *stream, int recurse,
		    struct value *val,
		    const struct value_print_options *options)
{
  error (_("internal error - unimplemented "
	   "function unk_lang_val_print called."));
}

static void
unk_lang_value_print (struct value *val, struct ui_file *stream,
		      const struct value_print_options *options)
{
  error (_("internal error - unimplemented "
	   "function unk_lang_value_print called."));
}

static CORE_ADDR unk_lang_trampoline (struct frame_info *frame, CORE_ADDR pc)
{
  return 0;
}

/* Unknown languages just use the cplus demangler.  */
static char *unk_lang_demangle (const char *mangled, int options)
{
  return gdb_demangle (mangled, options);
}

static char *unk_lang_class_name (const char *mangled)
{
  return NULL;
}

static const struct op_print unk_op_print_tab[] =
{
  {NULL, OP_NULL, PREC_NULL, 0}
};

static void
unknown_language_arch_info (struct gdbarch *gdbarch,
			    struct language_arch_info *lai)
{
  lai->string_char_type = builtin_type (gdbarch)->builtin_char;
  lai->bool_type_default = builtin_type (gdbarch)->builtin_int;
  lai->primitive_type_vector = GDBARCH_OBSTACK_CALLOC (gdbarch, 1,
						       struct type *);
}

const struct language_defn unknown_language_defn =
{
  "unknown",
  "Unknown",
  language_unknown,
  range_check_off,
  case_sensitive_on,
  array_row_major,
  macro_expansion_no,
  NULL,
  &exp_descriptor_standard,
  unk_lang_parser,
  unk_lang_error,
  null_post_parser,
  unk_lang_printchar,		/* Print character constant */
  unk_lang_printstr,
  unk_lang_emit_char,
  unk_lang_print_type,		/* Print a type using appropriate syntax */
  default_print_typedef,	/* Print a typedef using appropriate syntax */
  unk_lang_val_print,		/* Print a value using appropriate syntax */
  unk_lang_value_print,		/* Print a top-level value */
  default_read_var_value,	/* la_read_var_value */
  unk_lang_trampoline,		/* Language specific skip_trampoline */
  "this",        	    	/* name_of_this */
  basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
  basic_lookup_transparent_type,/* lookup_transparent_type */
  unk_lang_demangle,		/* Language specific symbol demangler */
  NULL,
  unk_lang_class_name,		/* Language specific
				   class_name_from_physname */
  unk_op_print_tab,		/* expression operators for printing */
  1,				/* c-style arrays */
  0,				/* String lower bound */
  default_word_break_characters,
  default_make_symbol_completion_list,
  unknown_language_arch_info,	/* la_language_arch_info.  */
  default_print_array_index,
  default_pass_by_reference,
  default_get_string,
  NULL,				/* la_get_symbol_name_cmp */
  iterate_over_symbols,
  &default_varobj_ops,
  NULL,
  NULL,
  LANG_MAGIC
};

/* These two structs define fake entries for the "local" and "auto"
   options.  */
const struct language_defn auto_language_defn =
{
  "auto",
  "Auto",
  language_auto,
  range_check_off,
  case_sensitive_on,
  array_row_major,
  macro_expansion_no,
  NULL,
  &exp_descriptor_standard,
  unk_lang_parser,
  unk_lang_error,
  null_post_parser,
  unk_lang_printchar,		/* Print character constant */
  unk_lang_printstr,
  unk_lang_emit_char,
  unk_lang_print_type,		/* Print a type using appropriate syntax */
  default_print_typedef,	/* Print a typedef using appropriate syntax */
  unk_lang_val_print,		/* Print a value using appropriate syntax */
  unk_lang_value_print,		/* Print a top-level value */
  default_read_var_value,	/* la_read_var_value */
  unk_lang_trampoline,		/* Language specific skip_trampoline */
  "this",		        /* name_of_this */
  basic_lookup_symbol_nonlocal,	/* lookup_symbol_nonlocal */
  basic_lookup_transparent_type,/* lookup_transparent_type */
  unk_lang_demangle,		/* Language specific symbol demangler */
  NULL,
  unk_lang_class_name,		/* Language specific
				   class_name_from_physname */
  unk_op_print_tab,		/* expression operators for printing */
  1,				/* c-style arrays */
  0,				/* String lower bound */
  default_word_break_characters,
  default_make_symbol_completion_list,
  unknown_language_arch_info,	/* la_language_arch_info.  */
  default_print_array_index,
  default_pass_by_reference,
  default_get_string,
  NULL,				/* la_get_symbol_name_cmp */
  iterate_over_symbols,
  &default_varobj_ops,
  NULL,
  NULL,
  LANG_MAGIC
};

const struct language_defn local_language_defn =
{
  "local",
  "Local",
  language_auto,
  range_check_off,
  case_sensitive_on,
  array_row_major,
  macro_expansion_no,
  NULL,
  &exp_descriptor_standard,
  unk_lang_parser,
  unk_lang_error,
  null_post_parser,
  unk_lang_printchar,		/* Print character constant */
  unk_lang_printstr,
  unk_lang_emit_char,
  unk_lang_print_type,		/* Print a type using appropriate syntax */
  default_print_typedef,	/* Print a typedef using appropriate syntax */
  unk_lang_val_print,		/* Print a value using appropriate syntax */
  unk_lang_value_print,		/* Print a top-level value */
  default_read_var_value,	/* la_read_var_value */
  unk_lang_trampoline,		/* Language specific skip_trampoline */
  "this", 		        /* name_of_this */
  basic_lookup_symbol_nonlocal,	/* lookup_symbol_nonlocal */
  basic_lookup_transparent_type,/* lookup_transparent_type */
  unk_lang_demangle,		/* Language specific symbol demangler */
  NULL,
  unk_lang_class_name,		/* Language specific
				   class_name_from_physname */
  unk_op_print_tab,		/* expression operators for printing */
  1,				/* c-style arrays */
  0,				/* String lower bound */
  default_word_break_characters,
  default_make_symbol_completion_list,
  unknown_language_arch_info,	/* la_language_arch_info.  */
  default_print_array_index,
  default_pass_by_reference,
  default_get_string,
  NULL,				/* la_get_symbol_name_cmp */
  iterate_over_symbols,
  &default_varobj_ops,
  NULL,
  NULL,
  LANG_MAGIC
};

/* Per-architecture language information.  */

static struct gdbarch_data *language_gdbarch_data;

struct language_gdbarch
{
  /* A vector of per-language per-architecture info.  Indexed by "enum
     language".  */
  struct language_arch_info arch_info[nr_languages];
};

static void *
language_gdbarch_post_init (struct gdbarch *gdbarch)
{
  struct language_gdbarch *l;
  int i;

  l = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct language_gdbarch);
  for (i = 0; i < languages_size; i++)
    {
      if (languages[i] != NULL
	  && languages[i]->la_language_arch_info != NULL)
	languages[i]->la_language_arch_info
	  (gdbarch, l->arch_info + languages[i]->la_language);
    }
  return l;
}

struct type *
language_string_char_type (const struct language_defn *la,
			   struct gdbarch *gdbarch)
{
  struct language_gdbarch *ld
    = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);

  return ld->arch_info[la->la_language].string_char_type;
}

struct type *
language_bool_type (const struct language_defn *la,
		    struct gdbarch *gdbarch)
{
  struct language_gdbarch *ld
    = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);

  if (ld->arch_info[la->la_language].bool_type_symbol)
    {
      struct symbol *sym;

      sym = lookup_symbol (ld->arch_info[la->la_language].bool_type_symbol,
			   NULL, VAR_DOMAIN, NULL).symbol;
      if (sym)
	{
	  struct type *type = SYMBOL_TYPE (sym);

	  if (type && TYPE_CODE (type) == TYPE_CODE_BOOL)
	    return type;
	}
    }

  return ld->arch_info[la->la_language].bool_type_default;
}

/* Helper function for primitive type lookup.  */

static struct type **
language_lookup_primitive_type_1 (const struct language_arch_info *lai,
				  const char *name)
{
  struct type **p;

  for (p = lai->primitive_type_vector; (*p) != NULL; p++)
    {
      if (strcmp (TYPE_NAME (*p), name) == 0)
	return p;
    }
  return NULL;
}

/* See language.h.  */

struct type *
language_lookup_primitive_type (const struct language_defn *la,
				struct gdbarch *gdbarch,
				const char *name)
{
  struct language_gdbarch *ld =
    (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
  struct type **typep;

  typep = language_lookup_primitive_type_1 (&ld->arch_info[la->la_language],
					    name);
  if (typep == NULL)
    return NULL;
  return *typep;
}

/* Helper function for type lookup as a symbol.
   Create the symbol corresponding to type TYPE in language LANG.  */

static struct symbol *
language_alloc_type_symbol (enum language lang, struct type *type)
{
  struct symbol *symbol;
  struct gdbarch *gdbarch;

  gdb_assert (!TYPE_OBJFILE_OWNED (type));

  gdbarch = TYPE_OWNER (type).gdbarch;
  symbol = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct symbol);

  symbol->ginfo.name = TYPE_NAME (type);
  symbol->ginfo.language = lang;
  symbol->owner.arch = gdbarch;
  SYMBOL_OBJFILE_OWNED (symbol) = 0;
  SYMBOL_TYPE (symbol) = type;
  SYMBOL_DOMAIN (symbol) = VAR_DOMAIN;
  SYMBOL_ACLASS_INDEX (symbol) = LOC_TYPEDEF;

  return symbol;
}

/* Initialize the primitive type symbols of language LD.
   The primitive type vector must have already been initialized.  */

static void
language_init_primitive_type_symbols (struct language_arch_info *lai,
				      const struct language_defn *la,
				      struct gdbarch *gdbarch)
{
  int n;

  gdb_assert (lai->primitive_type_vector != NULL);

  for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
    continue;

  lai->primitive_type_symbols
    = GDBARCH_OBSTACK_CALLOC (gdbarch, n + 1, struct symbol *);

  for (n = 0; lai->primitive_type_vector[n] != NULL; ++n)
    {
      lai->primitive_type_symbols[n]
	= language_alloc_type_symbol (la->la_language,
				      lai->primitive_type_vector[n]);
    }

  /* Note: The result of symbol lookup is normally a symbol *and* the block
     it was found in.  Builtin types don't live in blocks.  We *could* give
     them one, but there is no current need so to keep things simple symbol
     lookup is extended to allow for BLOCK_FOUND to be NULL.  */
}

/* See language.h.  */

struct symbol *
language_lookup_primitive_type_as_symbol (const struct language_defn *la,
					  struct gdbarch *gdbarch,
					  const char *name)
{
  struct language_gdbarch *ld
    = (struct language_gdbarch *) gdbarch_data (gdbarch, language_gdbarch_data);
  struct language_arch_info *lai = &ld->arch_info[la->la_language];
  struct type **typep;
  struct symbol *sym;

  if (symbol_lookup_debug)
    {
      fprintf_unfiltered (gdb_stdlog,
			  "language_lookup_primitive_type_as_symbol"
			  " (%s, %s, %s)",
			  la->la_name, host_address_to_string (gdbarch), name);
    }

  typep = language_lookup_primitive_type_1 (lai, name);
  if (typep == NULL)
    {
      if (symbol_lookup_debug)
	fprintf_unfiltered (gdb_stdlog, " = NULL\n");
      return NULL;
    }

  /* The set of symbols is lazily initialized.  */
  if (lai->primitive_type_symbols == NULL)
    language_init_primitive_type_symbols (lai, la, gdbarch);

  sym = lai->primitive_type_symbols[typep - lai->primitive_type_vector];

  if (symbol_lookup_debug)
    fprintf_unfiltered (gdb_stdlog, " = %s\n", host_address_to_string (sym));
  return sym;
}

/* Initialize the language routines.  */

void
_initialize_language (void)
{
  static const char *const type_or_range_names[]
    = { "on", "off", "warn", "auto", NULL };

  static const char *const case_sensitive_names[]
    = { "on", "off", "auto", NULL };

  language_gdbarch_data
    = gdbarch_data_register_post_init (language_gdbarch_post_init);

  /* GDB commands for language specific stuff.  */

  add_prefix_cmd ("check", no_class, set_check,
		  _("Set the status of the type/range checker."),
		  &setchecklist, "set check ", 0, &setlist);
  add_alias_cmd ("c", "check", no_class, 1, &setlist);
  add_alias_cmd ("ch", "check", no_class, 1, &setlist);

  add_prefix_cmd ("check", no_class, show_check,
		  _("Show the status of the type/range checker."),
		  &showchecklist, "show check ", 0, &showlist);
  add_alias_cmd ("c", "check", no_class, 1, &showlist);
  add_alias_cmd ("ch", "check", no_class, 1, &showlist);

  add_setshow_enum_cmd ("range", class_support, type_or_range_names,
			&range,
			_("Set range checking.  (on/warn/off/auto)"),
			_("Show range checking.  (on/warn/off/auto)"),
			NULL, set_range_command,
			show_range_command,
			&setchecklist, &showchecklist);

  add_setshow_enum_cmd ("case-sensitive", class_support, case_sensitive_names,
			&case_sensitive, _("\
Set case sensitivity in name search.  (on/off/auto)"), _("\
Show case sensitivity in name search.  (on/off/auto)"), _("\
For Fortran the default is off; for other languages the default is on."),
			set_case_command,
			show_case_command,
			&setlist, &showlist);

  add_language (&auto_language_defn);
  add_language (&local_language_defn);
  add_language (&unknown_language_defn);

  language = xstrdup ("auto");
  type = xstrdup ("auto");
  range = xstrdup ("auto");
  case_sensitive = xstrdup ("auto");

  /* Have the above take effect.  */
  set_language (language_auto);
}