summaryrefslogtreecommitdiff
path: root/gdb/cp-support.c
blob: bf42636539fb98580b04509cb195f5e90c04b2fa (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
/* Helper routines for C++ support in GDB.
   Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009
   Free Software Foundation, Inc.

   Contributed by MontaVista Software.

   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/>.  */

#include "defs.h"
#include "cp-support.h"
#include "gdb_string.h"
#include "demangle.h"
#include "gdb_assert.h"
#include "gdbcmd.h"
#include "dictionary.h"
#include "objfiles.h"
#include "frame.h"
#include "symtab.h"
#include "block.h"
#include "complaints.h"
#include "gdbtypes.h"

#include "safe-ctype.h"

#define d_left(dc) (dc)->u.s_binary.left
#define d_right(dc) (dc)->u.s_binary.right

/* Functions related to demangled name parsing.  */

static unsigned int cp_find_first_component_aux (const char *name,
						 int permissive);

static void demangled_name_complaint (const char *name);

/* Functions/variables related to overload resolution.  */

static int sym_return_val_size;
static int sym_return_val_index;
static struct symbol **sym_return_val;

static void overload_list_add_symbol (struct symbol *sym,
				      const char *oload_name);

static void make_symbol_overload_list_using (const char *func_name,
					     const char *namespace);

static void make_symbol_overload_list_qualified (const char *func_name);

static void read_in_psymtabs (const char *oload_name);

/* The list of "maint cplus" commands.  */

struct cmd_list_element *maint_cplus_cmd_list = NULL;

/* The actual commands.  */

static void maint_cplus_command (char *arg, int from_tty);
static void first_component_command (char *arg, int from_tty);

/* Return 1 if STRING is clearly already in canonical form.  This
   function is conservative; things which it does not recognize are
   assumed to be non-canonical, and the parser will sort them out
   afterwards.  This speeds up the critical path for alphanumeric
   identifiers.  */

static int
cp_already_canonical (const char *string)
{
  /* Identifier start character [a-zA-Z_].  */
  if (!ISIDST (string[0]))
    return 0;

  /* These are the only two identifiers which canonicalize to other
     than themselves or an error: unsigned -> unsigned int and
     signed -> int.  */
  if (string[0] == 'u' && strcmp (&string[1], "nsigned") == 0)
    return 0;
  else if (string[0] == 's' && strcmp (&string[1], "igned") == 0)
    return 0;

  /* Identifier character [a-zA-Z0-9_].  */
  while (ISIDNUM (string[1]))
    string++;

  if (string[1] == '\0')
    return 1;
  else
    return 0;
}

/* Parse STRING and convert it to canonical form.  If parsing fails,
   or if STRING is already canonical, return NULL.  Otherwise return
   the canonical form.  The return value is allocated via xmalloc.  */

char *
cp_canonicalize_string (const char *string)
{
  struct demangle_component *ret_comp;
  unsigned int estimated_len;
  char *ret;

  if (cp_already_canonical (string))
    return NULL;

  ret_comp = cp_demangled_name_to_comp (string, NULL);
  if (ret_comp == NULL)
    return NULL;

  estimated_len = strlen (string) * 2;
  ret = cp_comp_to_string (ret_comp, estimated_len);

  if (strcmp (string, ret) == 0)
    {
      xfree (ret);
      return NULL;
    }

  return ret;
}

/* Convert a mangled name to a demangle_component tree.  *MEMORY is set to the
   block of used memory that should be freed when finished with the tree. 
   DEMANGLED_P is set to the char * that should be freed when finished with
   the tree, or NULL if none was needed.  OPTIONS will be passed to the
   demangler.  */

static struct demangle_component *
mangled_name_to_comp (const char *mangled_name, int options,
		      void **memory, char **demangled_p)
{
  struct demangle_component *ret;
  char *demangled_name;
  int len;

  /* If it looks like a v3 mangled name, then try to go directly
     to trees.  */
  if (mangled_name[0] == '_' && mangled_name[1] == 'Z')
    {
      ret = cplus_demangle_v3_components (mangled_name, options, memory);
      if (ret)
	{
	  *demangled_p = NULL;
	  return ret;
	}
    }

  /* If it doesn't, or if that failed, then try to demangle the name.  */
  demangled_name = cplus_demangle (mangled_name, options);
  if (demangled_name == NULL)
   return NULL;
  
  /* If we could demangle the name, parse it to build the component tree.  */
  ret = cp_demangled_name_to_comp (demangled_name, NULL);

  if (ret == NULL)
    {
      xfree (demangled_name);
      return NULL;
    }

  *demangled_p = demangled_name;
  return ret;
}

/* Return the name of the class containing method PHYSNAME.  */

char *
cp_class_name_from_physname (const char *physname)
{
  void *storage = NULL;
  char *demangled_name = NULL, *ret;
  struct demangle_component *ret_comp, *prev_comp, *cur_comp;
  int done;

  ret_comp = mangled_name_to_comp (physname, DMGL_ANSI, &storage,
				   &demangled_name);
  if (ret_comp == NULL)
    return NULL;

  done = 0;

  /* First strip off any qualifiers, if we have a function or method.  */
  while (!done)
    switch (ret_comp->type)
      {
      case DEMANGLE_COMPONENT_CONST:
      case DEMANGLE_COMPONENT_RESTRICT:
      case DEMANGLE_COMPONENT_VOLATILE:
      case DEMANGLE_COMPONENT_CONST_THIS:
      case DEMANGLE_COMPONENT_RESTRICT_THIS:
      case DEMANGLE_COMPONENT_VOLATILE_THIS:
      case DEMANGLE_COMPONENT_VENDOR_TYPE_QUAL:
        ret_comp = d_left (ret_comp);
        break;
      default:
	done = 1;
	break;
      }

  /* If what we have now is a function, discard the argument list.  */
  if (ret_comp->type == DEMANGLE_COMPONENT_TYPED_NAME)
    ret_comp = d_left (ret_comp);

  /* If what we have now is a template, strip off the template
     arguments.  The left subtree may be a qualified name.  */
  if (ret_comp->type == DEMANGLE_COMPONENT_TEMPLATE)
    ret_comp = d_left (ret_comp);

  /* What we have now should be a name, possibly qualified.  Additional
     qualifiers could live in the left subtree or the right subtree.  Find
     the last piece.  */
  done = 0;
  prev_comp = NULL;
  cur_comp = ret_comp;
  while (!done)
    switch (cur_comp->type)
      {
      case DEMANGLE_COMPONENT_QUAL_NAME:
      case DEMANGLE_COMPONENT_LOCAL_NAME:
	prev_comp = cur_comp;
        cur_comp = d_right (cur_comp);
        break;
      case DEMANGLE_COMPONENT_TEMPLATE:
      case DEMANGLE_COMPONENT_NAME:
      case DEMANGLE_COMPONENT_CTOR:
      case DEMANGLE_COMPONENT_DTOR:
      case DEMANGLE_COMPONENT_OPERATOR:
      case DEMANGLE_COMPONENT_EXTENDED_OPERATOR:
	done = 1;
	break;
      default:
	done = 1;
	cur_comp = NULL;
	break;
      }

  ret = NULL;
  if (cur_comp != NULL && prev_comp != NULL)
    {
      /* We want to discard the rightmost child of PREV_COMP.  */
      *prev_comp = *d_left (prev_comp);
      /* The ten is completely arbitrary; we don't have a good estimate.  */
      ret = cp_comp_to_string (ret_comp, 10);
    }

  xfree (storage);
  if (demangled_name)
    xfree (demangled_name);
  return ret;
}

/* Return the child of COMP which is the basename of a method, variable,
   et cetera.  All scope qualifiers are discarded, but template arguments
   will be included.  The component tree may be modified.  */

static struct demangle_component *
unqualified_name_from_comp (struct demangle_component *comp)
{
  struct demangle_component *ret_comp = comp, *last_template;
  int done;

  done = 0;
  last_template = NULL;
  while (!done)
    switch (ret_comp->type)
      {
      case DEMANGLE_COMPONENT_QUAL_NAME:
      case DEMANGLE_COMPONENT_LOCAL_NAME:
        ret_comp = d_right (ret_comp);
        break;
      case DEMANGLE_COMPONENT_TYPED_NAME:
        ret_comp = d_left (ret_comp);
        break;
      case DEMANGLE_COMPONENT_TEMPLATE:
	gdb_assert (last_template == NULL);
	last_template = ret_comp;
	ret_comp = d_left (ret_comp);
	break;
      case DEMANGLE_COMPONENT_CONST:
      case DEMANGLE_COMPONENT_RESTRICT:
      case DEMANGLE_COMPONENT_VOLATILE:
      case DEMANGLE_COMPONENT_CONST_THIS:
      case DEMANGLE_COMPONENT_RESTRICT_THIS:
      case DEMANGLE_COMPONENT_VOLATILE_THIS:
      case DEMANGLE_COMPONENT_VENDOR_TYPE_QUAL:
        ret_comp = d_left (ret_comp);
        break;
      case DEMANGLE_COMPONENT_NAME:
      case DEMANGLE_COMPONENT_CTOR:
      case DEMANGLE_COMPONENT_DTOR:
      case DEMANGLE_COMPONENT_OPERATOR:
      case DEMANGLE_COMPONENT_EXTENDED_OPERATOR:
	done = 1;
	break;
      default:
	return NULL;
	break;
      }

  if (last_template)
    {
      d_left (last_template) = ret_comp;
      return last_template;
    }

  return ret_comp;
}

/* Return the name of the method whose linkage name is PHYSNAME.  */

char *
method_name_from_physname (const char *physname)
{
  void *storage = NULL;
  char *demangled_name = NULL, *ret;
  struct demangle_component *ret_comp;
  int done;

  ret_comp = mangled_name_to_comp (physname, DMGL_ANSI, &storage,
				   &demangled_name);
  if (ret_comp == NULL)
    return NULL;

  ret_comp = unqualified_name_from_comp (ret_comp);

  ret = NULL;
  if (ret_comp != NULL)
    /* The ten is completely arbitrary; we don't have a good estimate.  */
    ret = cp_comp_to_string (ret_comp, 10);

  xfree (storage);
  if (demangled_name)
    xfree (demangled_name);
  return ret;
}

/* If FULL_NAME is the demangled name of a C++ function (including an
   arg list, possibly including namespace/class qualifications),
   return a new string containing only the function name (without the
   arg list/class qualifications).  Otherwise, return NULL.  The
   caller is responsible for freeing the memory in question.  */

char *
cp_func_name (const char *full_name)
{
  char *ret;
  struct demangle_component *ret_comp;
  int done;

  ret_comp = cp_demangled_name_to_comp (full_name, NULL);
  if (!ret_comp)
    return NULL;

  ret_comp = unqualified_name_from_comp (ret_comp);

  ret = NULL;
  if (ret_comp != NULL)
    ret = cp_comp_to_string (ret_comp, 10);

  return ret;
}

/* DEMANGLED_NAME is the name of a function, including parameters and
   (optionally) a return type.  Return the name of the function without
   parameters or return type, or NULL if we can not parse the name.  */

char *
cp_remove_params (const char *demangled_name)
{
  int done = 0;
  struct demangle_component *ret_comp;
  char *ret = NULL;

  if (demangled_name == NULL)
    return NULL;

  ret_comp = cp_demangled_name_to_comp (demangled_name, NULL);
  if (ret_comp == NULL)
    return NULL;

  /* First strip off any qualifiers, if we have a function or method.  */
  while (!done)
    switch (ret_comp->type)
      {
      case DEMANGLE_COMPONENT_CONST:
      case DEMANGLE_COMPONENT_RESTRICT:
      case DEMANGLE_COMPONENT_VOLATILE:
      case DEMANGLE_COMPONENT_CONST_THIS:
      case DEMANGLE_COMPONENT_RESTRICT_THIS:
      case DEMANGLE_COMPONENT_VOLATILE_THIS:
      case DEMANGLE_COMPONENT_VENDOR_TYPE_QUAL:
        ret_comp = d_left (ret_comp);
        break;
      default:
	done = 1;
	break;
      }

  /* What we have now should be a function.  Return its name.  */
  if (ret_comp->type == DEMANGLE_COMPONENT_TYPED_NAME)
    ret = cp_comp_to_string (d_left (ret_comp), 10);

  return ret;
}

/* Here are some random pieces of trivia to keep in mind while trying
   to take apart demangled names:

   - Names can contain function arguments or templates, so the process
     has to be, to some extent recursive: maybe keep track of your
     depth based on encountering <> and ().

   - Parentheses don't just have to happen at the end of a name: they
     can occur even if the name in question isn't a function, because
     a template argument might be a type that's a function.

   - Conversely, even if you're trying to deal with a function, its
     demangled name might not end with ')': it could be a const or
     volatile class method, in which case it ends with "const" or
     "volatile".

   - Parentheses are also used in anonymous namespaces: a variable
     'foo' in an anonymous namespace gets demangled as "(anonymous
     namespace)::foo".

   - And operator names can contain parentheses or angle brackets.  */

/* FIXME: carlton/2003-03-13: We have several functions here with
   overlapping functionality; can we combine them?  Also, do they
   handle all the above considerations correctly?  */


/* This returns the length of first component of NAME, which should be
   the demangled name of a C++ variable/function/method/etc.
   Specifically, it returns the index of the first colon forming the
   boundary of the first component: so, given 'A::foo' or 'A::B::foo'
   it returns the 1, and given 'foo', it returns 0.  */

/* The character in NAME indexed by the return value is guaranteed to
   always be either ':' or '\0'.  */

/* NOTE: carlton/2003-03-13: This function is currently only intended
   for internal use: it's probably not entirely safe when called on
   user-generated input, because some of the 'index += 2' lines in
   cp_find_first_component_aux might go past the end of malformed
   input.  */

unsigned int
cp_find_first_component (const char *name)
{
  return cp_find_first_component_aux (name, 0);
}

/* Helper function for cp_find_first_component.  Like that function,
   it returns the length of the first component of NAME, but to make
   the recursion easier, it also stops if it reaches an unexpected ')'
   or '>' if the value of PERMISSIVE is nonzero.  */

/* Let's optimize away calls to strlen("operator").  */

#define LENGTH_OF_OPERATOR 8

static unsigned int
cp_find_first_component_aux (const char *name, int permissive)
{
  unsigned int index = 0;
  /* Operator names can show up in unexpected places.  Since these can
     contain parentheses or angle brackets, they can screw up the
     recursion.  But not every string 'operator' is part of an
     operater name: e.g. you could have a variable 'cooperator'.  So
     this variable tells us whether or not we should treat the string
     'operator' as starting an operator.  */
  int operator_possible = 1;

  for (;; ++index)
    {
      switch (name[index])
	{
	case '<':
	  /* Template; eat it up.  The calls to cp_first_component
	     should only return (I hope!) when they reach the '>'
	     terminating the component or a '::' between two
	     components.  (Hence the '+ 2'.)  */
	  index += 1;
	  for (index += cp_find_first_component_aux (name + index, 1);
	       name[index] != '>';
	       index += cp_find_first_component_aux (name + index, 1))
	    {
	      if (name[index] != ':')
		{
		  demangled_name_complaint (name);
		  return strlen (name);
		}
	      index += 2;
	    }
	  operator_possible = 1;
	  break;
	case '(':
	  /* Similar comment as to '<'.  */
	  index += 1;
	  for (index += cp_find_first_component_aux (name + index, 1);
	       name[index] != ')';
	       index += cp_find_first_component_aux (name + index, 1))
	    {
	      if (name[index] != ':')
		{
		  demangled_name_complaint (name);
		  return strlen (name);
		}
	      index += 2;
	    }
	  operator_possible = 1;
	  break;
	case '>':
	case ')':
	  if (permissive)
	    return index;
	  else
	    {
	      demangled_name_complaint (name);
	      return strlen (name);
	    }
	case '\0':
	case ':':
	  return index;
	case 'o':
	  /* Operator names can screw up the recursion.  */
	  if (operator_possible
	      && strncmp (name + index, "operator", LENGTH_OF_OPERATOR) == 0)
	    {
	      index += LENGTH_OF_OPERATOR;
	      while (ISSPACE(name[index]))
		++index;
	      switch (name[index])
		{
		  /* Skip over one less than the appropriate number of
		     characters: the for loop will skip over the last
		     one.  */
		case '<':
		  if (name[index + 1] == '<')
		    index += 1;
		  else
		    index += 0;
		  break;
		case '>':
		case '-':
		  if (name[index + 1] == '>')
		    index += 1;
		  else
		    index += 0;
		  break;
		case '(':
		  index += 1;
		  break;
		default:
		  index += 0;
		  break;
		}
	    }
	  operator_possible = 0;
	  break;
	case ' ':
	case ',':
	case '.':
	case '&':
	case '*':
	  /* NOTE: carlton/2003-04-18: I'm not sure what the precise
	     set of relevant characters are here: it's necessary to
	     include any character that can show up before 'operator'
	     in a demangled name, and it's safe to include any
	     character that can't be part of an identifier's name.  */
	  operator_possible = 1;
	  break;
	default:
	  operator_possible = 0;
	  break;
	}
    }
}

/* Complain about a demangled name that we don't know how to parse.
   NAME is the demangled name in question.  */

static void
demangled_name_complaint (const char *name)
{
  complaint (&symfile_complaints,
	     "unexpected demangled name '%s'", name);
}

/* If NAME is the fully-qualified name of a C++
   function/variable/method/etc., this returns the length of its
   entire prefix: all of the namespaces and classes that make up its
   name.  Given 'A::foo', it returns 1, given 'A::B::foo', it returns
   4, given 'foo', it returns 0.  */

unsigned int
cp_entire_prefix_len (const char *name)
{
  unsigned int current_len = cp_find_first_component (name);
  unsigned int previous_len = 0;

  while (name[current_len] != '\0')
    {
      gdb_assert (name[current_len] == ':');
      previous_len = current_len;
      /* Skip the '::'.  */
      current_len += 2;
      current_len += cp_find_first_component (name + current_len);
    }

  return previous_len;
}

/* Overload resolution functions.  */

/* Test to see if SYM is a symbol that we haven't seen corresponding
   to a function named OLOAD_NAME.  If so, add it to the current
   completion list. */

static void
overload_list_add_symbol (struct symbol *sym, const char *oload_name)
{
  int newsize;
  int i;
  char *sym_name;

  /* If there is no type information, we can't do anything, so skip */
  if (SYMBOL_TYPE (sym) == NULL)
    return;

  /* skip any symbols that we've already considered. */
  for (i = 0; i < sym_return_val_index; ++i)
    if (strcmp (SYMBOL_LINKAGE_NAME (sym),
		SYMBOL_LINKAGE_NAME (sym_return_val[i])) == 0)
      return;

  /* Get the demangled name without parameters */
  sym_name = cp_remove_params (SYMBOL_NATURAL_NAME (sym));
  if (!sym_name)
    return;

  /* skip symbols that cannot match */
  if (strcmp (sym_name, oload_name) != 0)
    {
      xfree (sym_name);
      return;
    }

  xfree (sym_name);

  /* We have a match for an overload instance, so add SYM to the current list
   * of overload instances */
  if (sym_return_val_index + 3 > sym_return_val_size)
    {
      newsize = (sym_return_val_size *= 2) * sizeof (struct symbol *);
      sym_return_val = (struct symbol **) xrealloc ((char *) sym_return_val, newsize);
    }
  sym_return_val[sym_return_val_index++] = sym;
  sym_return_val[sym_return_val_index] = NULL;
}

/* Return a null-terminated list of pointers to function symbols that
   are named FUNC_NAME and are visible within NAMESPACE.  */

struct symbol **
make_symbol_overload_list (const char *func_name,
			   const char *namespace)
{
  struct cleanup *old_cleanups;

  sym_return_val_size = 100;
  sym_return_val_index = 0;
  sym_return_val = xmalloc ((sym_return_val_size + 1) *
			    sizeof (struct symbol *));
  sym_return_val[0] = NULL;

  old_cleanups = make_cleanup (xfree, sym_return_val);

  make_symbol_overload_list_using (func_name, namespace);

  discard_cleanups (old_cleanups);

  return sym_return_val;
}

/* This applies the using directives to add namespaces to search in,
   and then searches for overloads in all of those namespaces.  It
   adds the symbols found to sym_return_val.  Arguments are as in
   make_symbol_overload_list.  */

static void
make_symbol_overload_list_using (const char *func_name,
				 const char *namespace)
{
  const struct using_direct *current;

  /* First, go through the using directives.  If any of them apply,
     look in the appropriate namespaces for new functions to match
     on.  */

  for (current = block_using (get_selected_block (0));
       current != NULL;
       current = current->next)
    {
      if (strcmp (namespace, current->outer) == 0)
	{
	  make_symbol_overload_list_using (func_name,
					   current->inner);
	}
    }

  /* Now, add names for this namespace.  */
  
  if (namespace[0] == '\0')
    {
      make_symbol_overload_list_qualified (func_name);
    }
  else
    {
      char *concatenated_name
	= alloca (strlen (namespace) + 2 + strlen (func_name) + 1);
      strcpy (concatenated_name, namespace);
      strcat (concatenated_name, "::");
      strcat (concatenated_name, func_name);
      make_symbol_overload_list_qualified (concatenated_name);
    }
}

/* This does the bulk of the work of finding overloaded symbols.
   FUNC_NAME is the name of the overloaded function we're looking for
   (possibly including namespace info).  */

static void
make_symbol_overload_list_qualified (const char *func_name)
{
  struct symbol *sym;
  struct symtab *s;
  struct objfile *objfile;
  const struct block *b, *surrounding_static_block = 0;
  struct dict_iterator iter;
  const struct dictionary *dict;

  /* Look through the partial symtabs for all symbols which begin
     by matching FUNC_NAME.  Make sure we read that symbol table in. */

  read_in_psymtabs (func_name);

  /* Search upwards from currently selected frame (so that we can
     complete on local vars.  */

  for (b = get_selected_block (0); b != NULL; b = BLOCK_SUPERBLOCK (b))
    {
      dict = BLOCK_DICT (b);

      for (sym = dict_iter_name_first (dict, func_name, &iter);
	   sym;
	   sym = dict_iter_name_next (func_name, &iter))
	{
	  overload_list_add_symbol (sym, func_name);
	}
    }

  surrounding_static_block = block_static_block (get_selected_block (0));

  /* Go through the symtabs and check the externs and statics for
     symbols which match.  */

  ALL_PRIMARY_SYMTABS (objfile, s)
  {
    QUIT;
    b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), GLOBAL_BLOCK);
    dict = BLOCK_DICT (b);

    for (sym = dict_iter_name_first (dict, func_name, &iter);
	 sym;
	 sym = dict_iter_name_next (func_name, &iter))
    {
      overload_list_add_symbol (sym, func_name);
    }
  }

  ALL_PRIMARY_SYMTABS (objfile, s)
  {
    QUIT;
    b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), STATIC_BLOCK);
    /* Don't do this block twice.  */
    if (b == surrounding_static_block)
      continue;
    dict = BLOCK_DICT (b);

    for (sym = dict_iter_name_first (dict, func_name, &iter);
	 sym;
	 sym = dict_iter_name_next (func_name, &iter))
    {
      overload_list_add_symbol (sym, func_name);
    }
  }
}

/* Look through the partial symtabs for all symbols which begin
   by matching FUNC_NAME.  Make sure we read that symbol table in. */

static void
read_in_psymtabs (const char *func_name)
{
  struct partial_symtab *ps;
  struct objfile *objfile;

  ALL_PSYMTABS (objfile, ps)
  {
    if (ps->readin)
      continue;

    if ((lookup_partial_symbol (ps, func_name, NULL, 1, VAR_DOMAIN)
	 != NULL)
	|| (lookup_partial_symbol (ps, func_name, NULL, 0, VAR_DOMAIN)
	    != NULL))
      psymtab_to_symtab (ps);
  }
}

/* Lookup the rtti type for a class name. */

struct type *
cp_lookup_rtti_type (const char *name, struct block *block)
{
  struct symbol * rtti_sym;
  struct type * rtti_type;

  rtti_sym = lookup_symbol (name, block, STRUCT_DOMAIN, NULL);

  if (rtti_sym == NULL)
    {
      warning (_("RTTI symbol not found for class '%s'"), name);
      return NULL;
    }

  if (SYMBOL_CLASS (rtti_sym) != LOC_TYPEDEF)
    {
      warning (_("RTTI symbol for class '%s' is not a type"), name);
      return NULL;
    }

  rtti_type = SYMBOL_TYPE (rtti_sym);

  switch (TYPE_CODE (rtti_type))
    {
    case TYPE_CODE_CLASS:
      break;
    case TYPE_CODE_NAMESPACE:
      /* chastain/2003-11-26: the symbol tables often contain fake
	 symbols for namespaces with the same name as the struct.
	 This warning is an indication of a bug in the lookup order
	 or a bug in the way that the symbol tables are populated.  */
      warning (_("RTTI symbol for class '%s' is a namespace"), name);
      return NULL;
    default:
      warning (_("RTTI symbol for class '%s' has bad type"), name);
      return NULL;
    }

  return rtti_type;
}

/* Don't allow just "maintenance cplus".  */

static  void
maint_cplus_command (char *arg, int from_tty)
{
  printf_unfiltered (_("\"maintenance cplus\" must be followed by the name of a command.\n"));
  help_list (maint_cplus_cmd_list, "maintenance cplus ", -1, gdb_stdout);
}

/* This is a front end for cp_find_first_component, for unit testing.
   Be careful when using it: see the NOTE above
   cp_find_first_component.  */

static void
first_component_command (char *arg, int from_tty)
{
  int len;  
  char *prefix; 

  if (!arg)
    return;

  len = cp_find_first_component (arg);
  prefix = alloca (len + 1);

  memcpy (prefix, arg, len);
  prefix[len] = '\0';

  printf_unfiltered ("%s\n", prefix);
}

extern initialize_file_ftype _initialize_cp_support; /* -Wmissing-prototypes */

void
_initialize_cp_support (void)
{
  add_prefix_cmd ("cplus", class_maintenance, maint_cplus_command,
		  _("C++ maintenance commands."), &maint_cplus_cmd_list,
		  "maintenance cplus ", 0, &maintenancelist);
  add_alias_cmd ("cp", "cplus", class_maintenance, 1, &maintenancelist);

  add_cmd ("first_component", class_maintenance, first_component_command,
	   _("Print the first class/namespace component of NAME."),
	   &maint_cplus_cmd_list);
}