1 /* Support for printing C++ values for GDB, the GNU debugger.
2
3 Copyright (C) 1986-2013 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include "defs.h"
21 #include "gdb_obstack.h"
22 #include "symtab.h"
23 #include "gdbtypes.h"
24 #include "expression.h"
25 #include "value.h"
26 #include "command.h"
27 #include "gdbcmd.h"
28 #include "demangle.h"
29 #include "annotate.h"
30 #include "gdb_string.h"
31 #include "c-lang.h"
32 #include "target.h"
33 #include "cp-abi.h"
34 #include "valprint.h"
35 #include "cp-support.h"
36 #include "language.h"
37 #include "python/python.h"
38 #include "exceptions.h"
39 #include "typeprint.h"
40
41 /* Controls printing of vtbl's. */
42 static void
show_vtblprint(struct ui_file * file,int from_tty,struct cmd_list_element * c,const char * value)43 show_vtblprint (struct ui_file *file, int from_tty,
44 struct cmd_list_element *c, const char *value)
45 {
46 fprintf_filtered (file, _("\
47 Printing of C++ virtual function tables is %s.\n"),
48 value);
49 }
50
51 /* Controls looking up an object's derived type using what we find in
52 its vtables. */
53 static void
show_objectprint(struct ui_file * file,int from_tty,struct cmd_list_element * c,const char * value)54 show_objectprint (struct ui_file *file, int from_tty,
55 struct cmd_list_element *c,
56 const char *value)
57 {
58 fprintf_filtered (file, _("\
59 Printing of object's derived type based on vtable info is %s.\n"),
60 value);
61 }
62
63 static void
show_static_field_print(struct ui_file * file,int from_tty,struct cmd_list_element * c,const char * value)64 show_static_field_print (struct ui_file *file, int from_tty,
65 struct cmd_list_element *c,
66 const char *value)
67 {
68 fprintf_filtered (file,
69 _("Printing of C++ static members is %s.\n"),
70 value);
71 }
72
73
74 static struct obstack dont_print_vb_obstack;
75 static struct obstack dont_print_statmem_obstack;
76 static struct obstack dont_print_stat_array_obstack;
77
78 extern void _initialize_cp_valprint (void);
79
80 static void cp_print_static_field (struct type *, struct value *,
81 struct ui_file *, int,
82 const struct value_print_options *);
83
84 static void cp_print_value (struct type *, struct type *,
85 const gdb_byte *, int,
86 CORE_ADDR, struct ui_file *,
87 int, const struct value *,
88 const struct value_print_options *,
89 struct type **);
90
91
92 /* GCC versions after 2.4.5 use this. */
93 const char vtbl_ptr_name[] = "__vtbl_ptr_type";
94
95 /* Return truth value for assertion that TYPE is of the type
96 "pointer to virtual function". */
97
98 int
cp_is_vtbl_ptr_type(struct type * type)99 cp_is_vtbl_ptr_type (struct type *type)
100 {
101 const char *typename = type_name_no_tag (type);
102
103 return (typename != NULL && !strcmp (typename, vtbl_ptr_name));
104 }
105
106 /* Return truth value for the assertion that TYPE is of the type
107 "pointer to virtual function table". */
108
109 int
cp_is_vtbl_member(struct type * type)110 cp_is_vtbl_member (struct type *type)
111 {
112 /* With older versions of g++, the vtbl field pointed to an array of
113 structures. Nowadays it points directly to the structure. */
114 if (TYPE_CODE (type) == TYPE_CODE_PTR)
115 {
116 type = TYPE_TARGET_TYPE (type);
117 if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
118 {
119 type = TYPE_TARGET_TYPE (type);
120 if (TYPE_CODE (type) == TYPE_CODE_STRUCT /* if not using thunks */
121 || TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
122 {
123 /* Virtual functions tables are full of pointers
124 to virtual functions. */
125 return cp_is_vtbl_ptr_type (type);
126 }
127 }
128 else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) /* if not using thunks */
129 {
130 return cp_is_vtbl_ptr_type (type);
131 }
132 else if (TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
133 {
134 /* The type name of the thunk pointer is NULL when using
135 dwarf2. We could test for a pointer to a function, but
136 there is no type info for the virtual table either, so it
137 wont help. */
138 return cp_is_vtbl_ptr_type (type);
139 }
140 }
141 return 0;
142 }
143
144 /* Mutually recursive subroutines of cp_print_value and c_val_print to
145 print out a structure's fields: cp_print_value_fields and
146 cp_print_value.
147
148 TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the same
149 meanings as in cp_print_value and c_val_print.
150
151 2nd argument REAL_TYPE is used to carry over the type of the
152 derived class across the recursion to base classes.
153
154 DONT_PRINT is an array of baseclass types that we should not print,
155 or zero if called from top level. */
156
157 void
cp_print_value_fields(struct type * type,struct type * real_type,const gdb_byte * valaddr,int offset,CORE_ADDR address,struct ui_file * stream,int recurse,const struct value * val,const struct value_print_options * options,struct type ** dont_print_vb,int dont_print_statmem)158 cp_print_value_fields (struct type *type, struct type *real_type,
159 const gdb_byte *valaddr, int offset,
160 CORE_ADDR address, struct ui_file *stream,
161 int recurse, const struct value *val,
162 const struct value_print_options *options,
163 struct type **dont_print_vb,
164 int dont_print_statmem)
165 {
166 int i, len, n_baseclasses;
167 int fields_seen = 0;
168 static int last_set_recurse = -1;
169
170 CHECK_TYPEDEF (type);
171
172 if (recurse == 0)
173 {
174 /* Any object can be left on obstacks only during an unexpected
175 error. */
176
177 if (obstack_object_size (&dont_print_statmem_obstack) > 0)
178 {
179 obstack_free (&dont_print_statmem_obstack, NULL);
180 obstack_begin (&dont_print_statmem_obstack,
181 32 * sizeof (CORE_ADDR));
182 }
183 if (obstack_object_size (&dont_print_stat_array_obstack) > 0)
184 {
185 obstack_free (&dont_print_stat_array_obstack, NULL);
186 obstack_begin (&dont_print_stat_array_obstack,
187 32 * sizeof (struct type *));
188 }
189 }
190
191 fprintf_filtered (stream, "{");
192 len = TYPE_NFIELDS (type);
193 n_baseclasses = TYPE_N_BASECLASSES (type);
194
195 /* First, print out baseclasses such that we don't print
196 duplicates of virtual baseclasses. */
197
198 if (n_baseclasses > 0)
199 cp_print_value (type, real_type, valaddr,
200 offset, address, stream,
201 recurse + 1, val, options,
202 dont_print_vb);
203
204 /* Second, print out data fields */
205
206 /* If there are no data fields, skip this part */
207 if (len == n_baseclasses || !len)
208 fprintf_filtered (stream, "<No data fields>");
209 else
210 {
211 int statmem_obstack_initial_size = 0;
212 int stat_array_obstack_initial_size = 0;
213 struct type *vptr_basetype = NULL;
214 int vptr_fieldno;
215
216 if (dont_print_statmem == 0)
217 {
218 statmem_obstack_initial_size =
219 obstack_object_size (&dont_print_statmem_obstack);
220
221 if (last_set_recurse != recurse)
222 {
223 stat_array_obstack_initial_size =
224 obstack_object_size (&dont_print_stat_array_obstack);
225
226 last_set_recurse = recurse;
227 }
228 }
229
230 vptr_fieldno = get_vptr_fieldno (type, &vptr_basetype);
231 for (i = n_baseclasses; i < len; i++)
232 {
233 /* If requested, skip printing of static fields. */
234 if (!options->static_field_print
235 && field_is_static (&TYPE_FIELD (type, i)))
236 continue;
237
238 if (fields_seen)
239 fprintf_filtered (stream, ", ");
240 else if (n_baseclasses > 0)
241 {
242 if (options->pretty)
243 {
244 fprintf_filtered (stream, "\n");
245 print_spaces_filtered (2 + 2 * recurse, stream);
246 fputs_filtered ("members of ", stream);
247 fputs_filtered (type_name_no_tag (type), stream);
248 fputs_filtered (": ", stream);
249 }
250 }
251 fields_seen = 1;
252
253 if (options->pretty)
254 {
255 fprintf_filtered (stream, "\n");
256 print_spaces_filtered (2 + 2 * recurse, stream);
257 }
258 else
259 {
260 wrap_here (n_spaces (2 + 2 * recurse));
261 }
262
263 annotate_field_begin (TYPE_FIELD_TYPE (type, i));
264
265 if (field_is_static (&TYPE_FIELD (type, i)))
266 fputs_filtered ("static ", stream);
267 fprintf_symbol_filtered (stream,
268 TYPE_FIELD_NAME (type, i),
269 current_language->la_language,
270 DMGL_PARAMS | DMGL_ANSI);
271 annotate_field_name_end ();
272 /* Do not print leading '=' in case of anonymous
273 unions. */
274 if (strcmp (TYPE_FIELD_NAME (type, i), ""))
275 fputs_filtered (" = ", stream);
276 annotate_field_value ();
277
278 if (!field_is_static (&TYPE_FIELD (type, i))
279 && TYPE_FIELD_PACKED (type, i))
280 {
281 struct value *v;
282
283 /* Bitfields require special handling, especially due to
284 byte order problems. */
285 if (TYPE_FIELD_IGNORE (type, i))
286 {
287 fputs_filtered ("<optimized out or zero length>", stream);
288 }
289 else if (value_bits_synthetic_pointer (val,
290 TYPE_FIELD_BITPOS (type,
291 i),
292 TYPE_FIELD_BITSIZE (type,
293 i)))
294 {
295 fputs_filtered (_("<synthetic pointer>"), stream);
296 }
297 else if (!value_bits_valid (val,
298 TYPE_FIELD_BITPOS (type, i),
299 TYPE_FIELD_BITSIZE (type, i)))
300 {
301 val_print_optimized_out (stream);
302 }
303 else
304 {
305 struct value_print_options opts = *options;
306
307 opts.deref_ref = 0;
308
309 v = value_field_bitfield (type, i, valaddr, offset, val);
310
311 common_val_print (v, stream, recurse + 1, &opts,
312 current_language);
313 }
314 }
315 else
316 {
317 if (TYPE_FIELD_IGNORE (type, i))
318 {
319 fputs_filtered ("<optimized out or zero length>",
320 stream);
321 }
322 else if (field_is_static (&TYPE_FIELD (type, i)))
323 {
324 volatile struct gdb_exception ex;
325 struct value *v = NULL;
326
327 TRY_CATCH (ex, RETURN_MASK_ERROR)
328 {
329 v = value_static_field (type, i);
330 }
331
332 if (ex.reason < 0)
333 fprintf_filtered (stream,
334 _("<error reading variable: %s>"),
335 ex.message);
336 else if (v == NULL)
337 val_print_optimized_out (stream);
338 else
339 cp_print_static_field (TYPE_FIELD_TYPE (type, i),
340 v, stream, recurse + 1,
341 options);
342 }
343 else if (i == vptr_fieldno && type == vptr_basetype)
344 {
345 int i_offset = offset + TYPE_FIELD_BITPOS (type, i) / 8;
346 struct type *i_type = TYPE_FIELD_TYPE (type, i);
347
348 if (valprint_check_validity (stream, i_type, i_offset, val))
349 {
350 CORE_ADDR addr;
351
352 addr = extract_typed_address (valaddr + i_offset, i_type);
353 print_function_pointer_address (options,
354 get_type_arch (type),
355 addr, stream);
356 }
357 }
358 else
359 {
360 struct value_print_options opts = *options;
361
362 opts.deref_ref = 0;
363 val_print (TYPE_FIELD_TYPE (type, i),
364 valaddr,
365 offset + TYPE_FIELD_BITPOS (type, i) / 8,
366 address,
367 stream, recurse + 1, val, &opts,
368 current_language);
369 }
370 }
371 annotate_field_end ();
372 }
373
374 if (dont_print_statmem == 0)
375 {
376 int obstack_final_size =
377 obstack_object_size (&dont_print_statmem_obstack);
378
379 if (obstack_final_size > statmem_obstack_initial_size)
380 {
381 /* In effect, a pop of the printed-statics stack. */
382
383 void *free_to_ptr =
384 obstack_next_free (&dont_print_statmem_obstack) -
385 (obstack_final_size - statmem_obstack_initial_size);
386
387 obstack_free (&dont_print_statmem_obstack,
388 free_to_ptr);
389 }
390
391 if (last_set_recurse != recurse)
392 {
393 int obstack_final_size =
394 obstack_object_size (&dont_print_stat_array_obstack);
395
396 if (obstack_final_size > stat_array_obstack_initial_size)
397 {
398 void *free_to_ptr =
399 obstack_next_free (&dont_print_stat_array_obstack)
400 - (obstack_final_size
401 - stat_array_obstack_initial_size);
402
403 obstack_free (&dont_print_stat_array_obstack,
404 free_to_ptr);
405 }
406 last_set_recurse = -1;
407 }
408 }
409
410 if (options->pretty)
411 {
412 fprintf_filtered (stream, "\n");
413 print_spaces_filtered (2 * recurse, stream);
414 }
415 } /* if there are data fields */
416
417 fprintf_filtered (stream, "}");
418 }
419
420 /* Like cp_print_value_fields, but find the runtime type of the object
421 and pass it as the `real_type' argument to cp_print_value_fields.
422 This function is a hack to work around the fact that
423 common_val_print passes the embedded offset to val_print, but not
424 the enclosing type. */
425
426 void
cp_print_value_fields_rtti(struct type * type,const gdb_byte * valaddr,int offset,CORE_ADDR address,struct ui_file * stream,int recurse,const struct value * val,const struct value_print_options * options,struct type ** dont_print_vb,int dont_print_statmem)427 cp_print_value_fields_rtti (struct type *type,
428 const gdb_byte *valaddr, int offset,
429 CORE_ADDR address,
430 struct ui_file *stream, int recurse,
431 const struct value *val,
432 const struct value_print_options *options,
433 struct type **dont_print_vb,
434 int dont_print_statmem)
435 {
436 struct type *real_type = NULL;
437
438 /* We require all bits to be valid in order to attempt a
439 conversion. */
440 if (value_bits_valid (val, TARGET_CHAR_BIT * offset,
441 TARGET_CHAR_BIT * TYPE_LENGTH (type)))
442 {
443 struct value *value;
444 int full, top, using_enc;
445
446 /* Ugh, we have to convert back to a value here. */
447 value = value_from_contents_and_address (type, valaddr + offset,
448 address + offset);
449 /* We don't actually care about most of the result here -- just
450 the type. We already have the correct offset, due to how
451 val_print was initially called. */
452 real_type = value_rtti_type (value, &full, &top, &using_enc);
453 }
454
455 if (!real_type)
456 real_type = type;
457
458 cp_print_value_fields (type, real_type, valaddr, offset,
459 address, stream, recurse, val, options,
460 dont_print_vb, dont_print_statmem);
461 }
462
463 /* Special val_print routine to avoid printing multiple copies of
464 virtual baseclasses. */
465
466 static void
cp_print_value(struct type * type,struct type * real_type,const gdb_byte * valaddr,int offset,CORE_ADDR address,struct ui_file * stream,int recurse,const struct value * val,const struct value_print_options * options,struct type ** dont_print_vb)467 cp_print_value (struct type *type, struct type *real_type,
468 const gdb_byte *valaddr, int offset,
469 CORE_ADDR address, struct ui_file *stream,
470 int recurse, const struct value *val,
471 const struct value_print_options *options,
472 struct type **dont_print_vb)
473 {
474 struct type **last_dont_print
475 = (struct type **) obstack_next_free (&dont_print_vb_obstack);
476 struct obstack tmp_obstack = dont_print_vb_obstack;
477 int i, n_baseclasses = TYPE_N_BASECLASSES (type);
478 int thisoffset;
479 struct type *thistype;
480
481 if (dont_print_vb == 0)
482 {
483 /* If we're at top level, carve out a completely fresh chunk of
484 the obstack and use that until this particular invocation
485 returns. */
486 /* Bump up the high-water mark. Now alpha is omega. */
487 obstack_finish (&dont_print_vb_obstack);
488 }
489
490 for (i = 0; i < n_baseclasses; i++)
491 {
492 int boffset = 0;
493 int skip;
494 struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
495 const char *basename = TYPE_NAME (baseclass);
496 const gdb_byte *base_valaddr = NULL;
497 const struct value *base_val = NULL;
498 volatile struct gdb_exception ex;
499
500 if (BASETYPE_VIA_VIRTUAL (type, i))
501 {
502 struct type **first_dont_print
503 = (struct type **) obstack_base (&dont_print_vb_obstack);
504
505 int j = (struct type **)
506 obstack_next_free (&dont_print_vb_obstack) - first_dont_print;
507
508 while (--j >= 0)
509 if (baseclass == first_dont_print[j])
510 goto flush_it;
511
512 obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
513 }
514
515 thisoffset = offset;
516 thistype = real_type;
517
518 TRY_CATCH (ex, RETURN_MASK_ERROR)
519 {
520 boffset = baseclass_offset (type, i, valaddr, offset, address, val);
521 }
522 if (ex.reason < 0 && ex.error == NOT_AVAILABLE_ERROR)
523 skip = -1;
524 else if (ex.reason < 0)
525 skip = 1;
526 else
527 {
528 skip = 0;
529
530 if (BASETYPE_VIA_VIRTUAL (type, i))
531 {
532 /* The virtual base class pointer might have been
533 clobbered by the user program. Make sure that it
534 still points to a valid memory location. */
535
536 if ((boffset + offset) < 0
537 || (boffset + offset) >= TYPE_LENGTH (real_type))
538 {
539 gdb_byte *buf;
540 struct cleanup *back_to;
541
542 buf = xmalloc (TYPE_LENGTH (baseclass));
543 back_to = make_cleanup (xfree, buf);
544
545 if (target_read_memory (address + boffset, buf,
546 TYPE_LENGTH (baseclass)) != 0)
547 skip = 1;
548 base_val = value_from_contents_and_address (baseclass,
549 buf,
550 address + boffset);
551 thisoffset = 0;
552 boffset = 0;
553 thistype = baseclass;
554 base_valaddr = value_contents_for_printing_const (base_val);
555 do_cleanups (back_to);
556 }
557 else
558 {
559 base_valaddr = valaddr;
560 base_val = val;
561 }
562 }
563 else
564 {
565 base_valaddr = valaddr;
566 base_val = val;
567 }
568 }
569
570 /* Now do the printing. */
571 if (options->pretty)
572 {
573 fprintf_filtered (stream, "\n");
574 print_spaces_filtered (2 * recurse, stream);
575 }
576 fputs_filtered ("<", stream);
577 /* Not sure what the best notation is in the case where there is
578 no baseclass name. */
579 fputs_filtered (basename ? basename : "", stream);
580 fputs_filtered ("> = ", stream);
581
582 if (skip < 0)
583 val_print_unavailable (stream);
584 else if (skip > 0)
585 val_print_invalid_address (stream);
586 else
587 {
588 int result = 0;
589
590 /* Attempt to run the Python pretty-printers on the
591 baseclass if possible. */
592 if (!options->raw)
593 result = apply_val_pretty_printer (baseclass, base_valaddr,
594 thisoffset + boffset,
595 value_address (base_val),
596 stream, recurse, base_val,
597 options, current_language);
598
599
600
601 if (!result)
602 cp_print_value_fields (baseclass, thistype, base_valaddr,
603 thisoffset + boffset,
604 value_address (base_val),
605 stream, recurse, base_val, options,
606 ((struct type **)
607 obstack_base (&dont_print_vb_obstack)),
608 0);
609 }
610 fputs_filtered (", ", stream);
611
612 flush_it:
613 ;
614 }
615
616 if (dont_print_vb == 0)
617 {
618 /* Free the space used to deal with the printing
619 of this type from top level. */
620 obstack_free (&dont_print_vb_obstack, last_dont_print);
621 /* Reset watermark so that we can continue protecting
622 ourselves from whatever we were protecting ourselves. */
623 dont_print_vb_obstack = tmp_obstack;
624 }
625 }
626
627 /* Print value of a static member. To avoid infinite recursion when
628 printing a class that contains a static instance of the class, we
629 keep the addresses of all printed static member classes in an
630 obstack and refuse to print them more than once.
631
632 VAL contains the value to print, TYPE, STREAM, RECURSE, and OPTIONS
633 have the same meanings as in c_val_print. */
634
635 static void
cp_print_static_field(struct type * type,struct value * val,struct ui_file * stream,int recurse,const struct value_print_options * options)636 cp_print_static_field (struct type *type,
637 struct value *val,
638 struct ui_file *stream,
639 int recurse,
640 const struct value_print_options *options)
641 {
642 struct value_print_options opts;
643
644 if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
645 {
646 CORE_ADDR *first_dont_print;
647 CORE_ADDR addr;
648 int i;
649
650 first_dont_print
651 = (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
652 i = obstack_object_size (&dont_print_statmem_obstack)
653 / sizeof (CORE_ADDR);
654
655 while (--i >= 0)
656 {
657 if (value_address (val) == first_dont_print[i])
658 {
659 fputs_filtered ("<same as static member of an already"
660 " seen type>",
661 stream);
662 return;
663 }
664 }
665
666 addr = value_address (val);
667 obstack_grow (&dont_print_statmem_obstack, (char *) &addr,
668 sizeof (CORE_ADDR));
669 CHECK_TYPEDEF (type);
670 cp_print_value_fields (type, value_enclosing_type (val),
671 value_contents_for_printing (val),
672 value_embedded_offset (val), addr,
673 stream, recurse, val,
674 options, NULL, 1);
675 return;
676 }
677
678 if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
679 {
680 struct type **first_dont_print;
681 int i;
682 struct type *target_type = TYPE_TARGET_TYPE (type);
683
684 first_dont_print
685 = (struct type **) obstack_base (&dont_print_stat_array_obstack);
686 i = obstack_object_size (&dont_print_stat_array_obstack)
687 / sizeof (struct type *);
688
689 while (--i >= 0)
690 {
691 if (target_type == first_dont_print[i])
692 {
693 fputs_filtered ("<same as static member of an already"
694 " seen type>",
695 stream);
696 return;
697 }
698 }
699
700 obstack_grow (&dont_print_stat_array_obstack,
701 (char *) &target_type,
702 sizeof (struct type *));
703 }
704
705 opts = *options;
706 opts.deref_ref = 0;
707 val_print (type, value_contents_for_printing (val),
708 value_embedded_offset (val),
709 value_address (val),
710 stream, recurse, val,
711 &opts, current_language);
712 }
713
714
715 /* Find the field in *DOMAIN, or its non-virtual base classes, with
716 bit offset OFFSET. Set *DOMAIN to the containing type and *FIELDNO
717 to the containing field number. If OFFSET is not exactly at the
718 start of some field, set *DOMAIN to NULL. */
719
720 static void
cp_find_class_member(struct type ** domain_p,int * fieldno,LONGEST offset)721 cp_find_class_member (struct type **domain_p, int *fieldno,
722 LONGEST offset)
723 {
724 struct type *domain;
725 unsigned int i;
726 unsigned len;
727
728 *domain_p = check_typedef (*domain_p);
729 domain = *domain_p;
730 len = TYPE_NFIELDS (domain);
731
732 for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
733 {
734 LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i);
735
736 QUIT;
737 if (offset == bitpos)
738 {
739 *fieldno = i;
740 return;
741 }
742 }
743
744 for (i = 0; i < TYPE_N_BASECLASSES (domain); i++)
745 {
746 LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i);
747 LONGEST bitsize = 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (domain, i));
748
749 if (offset >= bitpos && offset < bitpos + bitsize)
750 {
751 *domain_p = TYPE_FIELD_TYPE (domain, i);
752 cp_find_class_member (domain_p, fieldno, offset - bitpos);
753 return;
754 }
755 }
756
757 *domain_p = NULL;
758 }
759
760 void
cp_print_class_member(const gdb_byte * valaddr,struct type * type,struct ui_file * stream,char * prefix)761 cp_print_class_member (const gdb_byte *valaddr, struct type *type,
762 struct ui_file *stream, char *prefix)
763 {
764 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
765
766 /* VAL is a byte offset into the structure type DOMAIN.
767 Find the name of the field for that offset and
768 print it. */
769 struct type *domain = TYPE_DOMAIN_TYPE (type);
770 LONGEST val;
771 unsigned int fieldno;
772
773 val = extract_signed_integer (valaddr,
774 TYPE_LENGTH (type),
775 byte_order);
776
777 /* Pointers to data members are usually byte offsets into an object.
778 Because a data member can have offset zero, and a NULL pointer to
779 member must be distinct from any valid non-NULL pointer to
780 member, either the value is biased or the NULL value has a
781 special representation; both are permitted by ISO C++. HP aCC
782 used a bias of 0x20000000; HP cfront used a bias of 1; g++ 3.x
783 and other compilers which use the Itanium ABI use -1 as the NULL
784 value. GDB only supports that last form; to add support for
785 another form, make this into a cp-abi hook. */
786
787 if (val == -1)
788 {
789 fprintf_filtered (stream, "NULL");
790 return;
791 }
792
793 cp_find_class_member (&domain, &fieldno, val << 3);
794
795 if (domain != NULL)
796 {
797 const char *name;
798
799 fputs_filtered (prefix, stream);
800 name = type_name_no_tag (domain);
801 if (name)
802 fputs_filtered (name, stream);
803 else
804 c_type_print_base (domain, stream, 0, 0, &type_print_raw_options);
805 fprintf_filtered (stream, "::");
806 fputs_filtered (TYPE_FIELD_NAME (domain, fieldno), stream);
807 }
808 else
809 fprintf_filtered (stream, "%ld", (long) val);
810 }
811
812
813 void
_initialize_cp_valprint(void)814 _initialize_cp_valprint (void)
815 {
816 add_setshow_boolean_cmd ("static-members", class_support,
817 &user_print_options.static_field_print, _("\
818 Set printing of C++ static members."), _("\
819 Show printing of C++ static members."), NULL,
820 NULL,
821 show_static_field_print,
822 &setprintlist, &showprintlist);
823
824 add_setshow_boolean_cmd ("vtbl", class_support,
825 &user_print_options.vtblprint, _("\
826 Set printing of C++ virtual function tables."), _("\
827 Show printing of C++ virtual function tables."), NULL,
828 NULL,
829 show_vtblprint,
830 &setprintlist, &showprintlist);
831
832 add_setshow_boolean_cmd ("object", class_support,
833 &user_print_options.objectprint, _("\
834 Set printing of object's derived type based on vtable info."), _("\
835 Show printing of object's derived type based on vtable info."), NULL,
836 NULL,
837 show_objectprint,
838 &setprintlist, &showprintlist);
839
840 obstack_begin (&dont_print_stat_array_obstack,
841 32 * sizeof (struct type *));
842 obstack_begin (&dont_print_statmem_obstack,
843 32 * sizeof (CORE_ADDR));
844 obstack_begin (&dont_print_vb_obstack,
845 32 * sizeof (struct type *));
846 }
847