Commit | Line | Data |
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a8a69e63 FF |
1 | /* Support for printing C++ values for GDB, the GNU debugger. |
2 | Copyright 1986, 1988, 1989, 1991 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "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" | |
5e81259d | 28 | #include "demangle.h" |
a8a69e63 FF |
29 | |
30 | int vtblprint; /* Controls printing of vtbl's */ | |
31 | int objectprint; /* Controls looking up an object's derived type | |
32 | using what we find in its vtables. */ | |
33 | struct obstack dont_print_obstack; | |
34 | ||
35 | static void | |
199b2450 | 36 | cplus_print_value PARAMS ((struct type *, char *, GDB_FILE *, int, int, |
a8a69e63 FF |
37 | enum val_prettyprint, struct type **)); |
38 | ||
39 | /* BEGIN-FIXME: Hooks into typeprint.c, find a better home for prototypes. */ | |
40 | ||
41 | extern void | |
199b2450 | 42 | c_type_print_base PARAMS ((struct type *, GDB_FILE *, int, int)); |
a8a69e63 FF |
43 | |
44 | extern void | |
199b2450 | 45 | c_type_print_varspec_prefix PARAMS ((struct type *, GDB_FILE *, int, int)); |
a8a69e63 FF |
46 | |
47 | extern void | |
48 | cp_type_print_method_args PARAMS ((struct type **, char *, char *, int, | |
199b2450 | 49 | GDB_FILE *)); |
a8a69e63 FF |
50 | |
51 | extern struct obstack dont_print_obstack; | |
52 | ||
53 | /* END-FIXME */ | |
54 | ||
c7da3ed3 FF |
55 | void |
56 | cp_print_class_method (valaddr, type, stream) | |
57 | char *valaddr; | |
58 | struct type *type; | |
199b2450 | 59 | GDB_FILE *stream; |
c7da3ed3 FF |
60 | { |
61 | struct type *domain; | |
72cd0384 RP |
62 | struct fn_field *f = NULL; |
63 | int j = 0; | |
c7da3ed3 FF |
64 | int len2; |
65 | int offset; | |
66 | char *kind = ""; | |
67 | CORE_ADDR addr; | |
68 | struct symbol *sym; | |
69 | unsigned len; | |
70 | unsigned int i; | |
71 | ||
30d20d15 | 72 | check_stub_type (TYPE_TARGET_TYPE (type)); |
c7da3ed3 | 73 | domain = TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)); |
30d20d15 PS |
74 | if (domain == (struct type *)NULL) |
75 | { | |
76 | fprintf_filtered (stream, "<unknown>"); | |
77 | return; | |
78 | } | |
c7da3ed3 FF |
79 | addr = unpack_pointer (lookup_pointer_type (builtin_type_void), valaddr); |
80 | if (METHOD_PTR_IS_VIRTUAL (addr)) | |
81 | { | |
82 | offset = METHOD_PTR_TO_VOFFSET (addr); | |
83 | len = TYPE_NFN_FIELDS (domain); | |
84 | for (i = 0; i < len; i++) | |
85 | { | |
86 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
87 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
88 | ||
89 | for (j = 0; j < len2; j++) | |
90 | { | |
91 | QUIT; | |
92 | if (TYPE_FN_FIELD_VOFFSET (f, j) == offset) | |
93 | { | |
94 | kind = "virtual "; | |
95 | goto common; | |
96 | } | |
97 | } | |
98 | } | |
99 | } | |
100 | else | |
101 | { | |
102 | sym = find_pc_function (addr); | |
103 | if (sym == 0) | |
104 | { | |
105 | error ("invalid pointer to member function"); | |
106 | } | |
107 | len = TYPE_NFN_FIELDS (domain); | |
108 | for (i = 0; i < len; i++) | |
109 | { | |
110 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
111 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
112 | ||
113 | for (j = 0; j < len2; j++) | |
114 | { | |
115 | QUIT; | |
39cb3d04 PS |
116 | if (TYPE_FN_FIELD_STUB (f, j)) |
117 | check_stub_method (domain, i, j); | |
c7da3ed3 FF |
118 | if (STREQ (SYMBOL_NAME (sym), TYPE_FN_FIELD_PHYSNAME (f, j))) |
119 | { | |
120 | goto common; | |
121 | } | |
122 | } | |
123 | } | |
124 | } | |
125 | common: | |
126 | if (i < len) | |
127 | { | |
128 | fprintf_filtered (stream, "&"); | |
129 | c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f, j), stream, 0, 0); | |
199b2450 | 130 | fprintf_unfiltered (stream, kind); |
c7da3ed3 FF |
131 | if (TYPE_FN_FIELD_PHYSNAME (f, j)[0] == '_' |
132 | && TYPE_FN_FIELD_PHYSNAME (f, j)[1] == CPLUS_MARKER) | |
133 | { | |
134 | cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j) + 1, "~", | |
135 | TYPE_FN_FIELDLIST_NAME (domain, i), | |
136 | 0, stream); | |
137 | } | |
138 | else | |
139 | { | |
140 | cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j), "", | |
141 | TYPE_FN_FIELDLIST_NAME (domain, i), | |
142 | 0, stream); | |
143 | } | |
144 | } | |
145 | else | |
146 | { | |
147 | fprintf_filtered (stream, "("); | |
148 | type_print (type, "", stream, -1); | |
149 | fprintf_filtered (stream, ") %d", (int) addr >> 3); | |
150 | } | |
151 | } | |
152 | ||
36a2283d PB |
153 | /* This was what it was for gcc 2.4.5 and earlier. */ |
154 | static const char vtbl_ptr_name_old[] = | |
155 | { CPLUS_MARKER,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 }; | |
156 | /* It was changed to this after 2.4.5. */ | |
157 | const char vtbl_ptr_name[] = | |
158 | { '_','_','v','t','b','l','_','p','t','r','_','t','y','p','e', 0 }; | |
159 | ||
a8a69e63 FF |
160 | /* Return truth value for assertion that TYPE is of the type |
161 | "pointer to virtual function". */ | |
162 | ||
163 | int | |
164 | cp_is_vtbl_ptr_type(type) | |
165 | struct type *type; | |
166 | { | |
167 | char *typename = type_name_no_tag (type); | |
a8a69e63 | 168 | |
8f341c15 JK |
169 | return (typename != NULL |
170 | && (STREQ (typename, vtbl_ptr_name) | |
171 | || STREQ (typename, vtbl_ptr_name_old))); | |
a8a69e63 FF |
172 | } |
173 | ||
174 | /* Return truth value for the assertion that TYPE is of the type | |
175 | "pointer to virtual function table". */ | |
176 | ||
177 | int | |
178 | cp_is_vtbl_member(type) | |
179 | struct type *type; | |
180 | { | |
181 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
36a2283d PB |
182 | { |
183 | type = TYPE_TARGET_TYPE (type); | |
184 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY) | |
185 | { | |
186 | type = TYPE_TARGET_TYPE (type); | |
187 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT /* if not using thunks */ | |
188 | || TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */ | |
189 | { | |
190 | /* Virtual functions tables are full of pointers | |
191 | to virtual functions. */ | |
192 | return cp_is_vtbl_ptr_type (type); | |
193 | } | |
194 | } | |
195 | } | |
a8a69e63 FF |
196 | return 0; |
197 | } | |
198 | ||
199 | /* Mutually recursive subroutines of cplus_print_value and c_val_print to | |
200 | print out a structure's fields: cp_print_value_fields and cplus_print_value. | |
201 | ||
202 | TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the | |
203 | same meanings as in cplus_print_value and c_val_print. | |
204 | ||
205 | DONT_PRINT is an array of baseclass types that we | |
206 | should not print, or zero if called from top level. */ | |
207 | ||
208 | void | |
209 | cp_print_value_fields (type, valaddr, stream, format, recurse, pretty, | |
210 | dont_print) | |
211 | struct type *type; | |
212 | char *valaddr; | |
199b2450 | 213 | GDB_FILE *stream; |
a8a69e63 FF |
214 | int format; |
215 | int recurse; | |
216 | enum val_prettyprint pretty; | |
217 | struct type **dont_print; | |
218 | { | |
219 | int i, len, n_baseclasses; | |
220 | ||
221 | check_stub_type (type); | |
222 | ||
223 | fprintf_filtered (stream, "{"); | |
224 | len = TYPE_NFIELDS (type); | |
225 | n_baseclasses = TYPE_N_BASECLASSES (type); | |
226 | ||
227 | /* Print out baseclasses such that we don't print | |
228 | duplicates of virtual baseclasses. */ | |
229 | if (n_baseclasses > 0) | |
230 | cplus_print_value (type, valaddr, stream, format, recurse+1, pretty, | |
231 | dont_print); | |
232 | ||
233 | if (!len && n_baseclasses == 1) | |
234 | fprintf_filtered (stream, "<No data fields>"); | |
235 | else | |
236 | { | |
237 | extern int inspect_it; | |
238 | int fields_seen = 0; | |
239 | ||
240 | for (i = n_baseclasses; i < len; i++) | |
241 | { | |
242 | /* Check if static field */ | |
243 | if (TYPE_FIELD_STATIC (type, i)) | |
244 | continue; | |
245 | if (fields_seen) | |
246 | fprintf_filtered (stream, ", "); | |
247 | else if (n_baseclasses > 0) | |
248 | { | |
249 | if (pretty) | |
250 | { | |
251 | fprintf_filtered (stream, "\n"); | |
252 | print_spaces_filtered (2 + 2 * recurse, stream); | |
253 | fputs_filtered ("members of ", stream); | |
254 | fputs_filtered (type_name_no_tag (type), stream); | |
255 | fputs_filtered (": ", stream); | |
256 | } | |
257 | } | |
258 | fields_seen = 1; | |
259 | ||
260 | if (pretty) | |
261 | { | |
262 | fprintf_filtered (stream, "\n"); | |
263 | print_spaces_filtered (2 + 2 * recurse, stream); | |
264 | } | |
265 | else | |
266 | { | |
267 | wrap_here (n_spaces (2 + 2 * recurse)); | |
268 | } | |
269 | if (inspect_it) | |
270 | { | |
271 | if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR) | |
272 | fputs_filtered ("\"( ptr \"", stream); | |
273 | else | |
274 | fputs_filtered ("\"( nodef \"", stream); | |
5e81259d FF |
275 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
276 | language_cplus, | |
277 | DMGL_PARAMS | DMGL_ANSI); | |
a8a69e63 | 278 | fputs_filtered ("\" \"", stream); |
5e81259d FF |
279 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
280 | language_cplus, | |
281 | DMGL_PARAMS | DMGL_ANSI); | |
a8a69e63 FF |
282 | fputs_filtered ("\") \"", stream); |
283 | } | |
284 | else | |
285 | { | |
96f7edbd | 286 | if (annotation_level > 1) |
da988c20 JK |
287 | { |
288 | printf_filtered ("\n\032\032field-begin "); | |
289 | print_value_flags (TYPE_FIELD_TYPE (type, i)); | |
290 | printf_filtered ("\n"); | |
291 | } | |
292 | ||
5e81259d FF |
293 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
294 | language_cplus, | |
295 | DMGL_PARAMS | DMGL_ANSI); | |
96f7edbd JK |
296 | if (annotation_level > 1) |
297 | printf_filtered ("\n\032\032field-name-end\n"); | |
a8a69e63 | 298 | fputs_filtered (" = ", stream); |
da988c20 JK |
299 | if (annotation_level > 1) |
300 | printf_filtered ("\n\032\032field-value\n"); | |
96f7edbd JK |
301 | } |
302 | ||
a8a69e63 FF |
303 | if (TYPE_FIELD_PACKED (type, i)) |
304 | { | |
82a2edfb | 305 | value_ptr v; |
a8a69e63 FF |
306 | |
307 | /* Bitfields require special handling, especially due to byte | |
308 | order problems. */ | |
024f65b1 KH |
309 | if (TYPE_FIELD_IGNORE (type, i)) |
310 | { | |
aa074e84 | 311 | fputs_filtered ("<optimized out or zero length>", stream); |
024f65b1 KH |
312 | } |
313 | else | |
314 | { | |
315 | v = value_from_longest (TYPE_FIELD_TYPE (type, i), | |
a8a69e63 FF |
316 | unpack_field_as_long (type, valaddr, i)); |
317 | ||
dda398c3 JK |
318 | val_print (TYPE_FIELD_TYPE(type, i), VALUE_CONTENTS (v), 0, |
319 | stream, format, 0, recurse + 1, pretty); | |
024f65b1 | 320 | } |
a8a69e63 FF |
321 | } |
322 | else | |
323 | { | |
024f65b1 KH |
324 | if (TYPE_FIELD_IGNORE (type, i)) |
325 | { | |
aa074e84 | 326 | fputs_filtered ("<optimized out or zero length>", stream); |
024f65b1 KH |
327 | } |
328 | else | |
329 | { | |
dda398c3 JK |
330 | val_print (TYPE_FIELD_TYPE (type, i), |
331 | valaddr + TYPE_FIELD_BITPOS (type, i) / 8, | |
332 | 0, stream, format, 0, recurse + 1, pretty); | |
024f65b1 | 333 | } |
a8a69e63 | 334 | } |
96f7edbd JK |
335 | if (annotation_level > 1) |
336 | printf_filtered ("\n\032\032field-end\n"); | |
a8a69e63 | 337 | } |
96f7edbd | 338 | |
a8a69e63 FF |
339 | if (pretty) |
340 | { | |
341 | fprintf_filtered (stream, "\n"); | |
342 | print_spaces_filtered (2 * recurse, stream); | |
343 | } | |
344 | } | |
345 | fprintf_filtered (stream, "}"); | |
346 | } | |
347 | ||
348 | /* Special val_print routine to avoid printing multiple copies of virtual | |
349 | baseclasses. */ | |
350 | ||
351 | static void | |
352 | cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print) | |
353 | struct type *type; | |
354 | char *valaddr; | |
199b2450 | 355 | GDB_FILE *stream; |
a8a69e63 FF |
356 | int format; |
357 | int recurse; | |
358 | enum val_prettyprint pretty; | |
359 | struct type **dont_print; | |
360 | { | |
361 | struct obstack tmp_obstack; | |
362 | struct type **last_dont_print | |
363 | = (struct type **)obstack_next_free (&dont_print_obstack); | |
364 | int i, n_baseclasses = TYPE_N_BASECLASSES (type); | |
365 | ||
366 | if (dont_print == 0) | |
367 | { | |
368 | /* If we're at top level, carve out a completely fresh | |
369 | chunk of the obstack and use that until this particular | |
370 | invocation returns. */ | |
371 | tmp_obstack = dont_print_obstack; | |
372 | /* Bump up the high-water mark. Now alpha is omega. */ | |
373 | obstack_finish (&dont_print_obstack); | |
374 | } | |
375 | ||
376 | for (i = 0; i < n_baseclasses; i++) | |
377 | { | |
5e678752 JK |
378 | /* FIXME-32x64--assumes that a target pointer can fit in a char *. |
379 | Fix it by nuking baseclass_addr. */ | |
a8a69e63 FF |
380 | char *baddr; |
381 | int err; | |
2d2fc7e4 JK |
382 | char *basename; |
383 | ||
384 | check_stub_type (TYPE_BASECLASS (type, i)); | |
385 | basename = TYPE_NAME (TYPE_BASECLASS (type, i)); | |
a8a69e63 FF |
386 | |
387 | if (BASETYPE_VIA_VIRTUAL (type, i)) | |
388 | { | |
389 | struct type **first_dont_print | |
390 | = (struct type **)obstack_base (&dont_print_obstack); | |
391 | ||
392 | int j = (struct type **)obstack_next_free (&dont_print_obstack) | |
393 | - first_dont_print; | |
394 | ||
395 | while (--j >= 0) | |
396 | if (TYPE_BASECLASS (type, i) == first_dont_print[j]) | |
397 | goto flush_it; | |
398 | ||
399 | obstack_ptr_grow (&dont_print_obstack, TYPE_BASECLASS (type, i)); | |
400 | } | |
401 | ||
402 | /* Fix to use baseclass_offset instead. FIXME */ | |
403 | baddr = baseclass_addr (type, i, valaddr, 0, &err); | |
404 | if (err == 0 && baddr == 0) | |
1410f5f1 JK |
405 | error ("could not find virtual baseclass %s\n", |
406 | basename ? basename : ""); | |
a8a69e63 FF |
407 | |
408 | if (pretty) | |
409 | { | |
410 | fprintf_filtered (stream, "\n"); | |
411 | print_spaces_filtered (2 * recurse, stream); | |
412 | } | |
413 | fputs_filtered ("<", stream); | |
1410f5f1 JK |
414 | /* Not sure what the best notation is in the case where there is no |
415 | baseclass name. */ | |
416 | fputs_filtered (basename ? basename : "", stream); | |
a8a69e63 FF |
417 | fputs_filtered ("> = ", stream); |
418 | if (err != 0) | |
833e0d94 JK |
419 | { |
420 | fprintf_filtered (stream, "<invalid address "); | |
d24c0599 | 421 | print_address_numeric ((CORE_ADDR) baddr, 1, stream); |
833e0d94 JK |
422 | fprintf_filtered (stream, ">"); |
423 | } | |
a8a69e63 FF |
424 | else |
425 | cp_print_value_fields (TYPE_BASECLASS (type, i), baddr, stream, format, | |
426 | recurse, pretty, | |
427 | (struct type **) obstack_base (&dont_print_obstack)); | |
428 | fputs_filtered (", ", stream); | |
429 | ||
430 | flush_it: | |
431 | ; | |
432 | } | |
433 | ||
434 | if (dont_print == 0) | |
435 | { | |
436 | /* Free the space used to deal with the printing | |
437 | of this type from top level. */ | |
438 | obstack_free (&dont_print_obstack, last_dont_print); | |
439 | /* Reset watermark so that we can continue protecting | |
440 | ourselves from whatever we were protecting ourselves. */ | |
441 | dont_print_obstack = tmp_obstack; | |
442 | } | |
443 | } | |
444 | ||
445 | void | |
446 | cp_print_class_member (valaddr, domain, stream, prefix) | |
447 | char *valaddr; | |
448 | struct type *domain; | |
199b2450 | 449 | GDB_FILE *stream; |
a8a69e63 FF |
450 | char *prefix; |
451 | { | |
452 | ||
453 | /* VAL is a byte offset into the structure type DOMAIN. | |
454 | Find the name of the field for that offset and | |
455 | print it. */ | |
456 | int extra = 0; | |
457 | int bits = 0; | |
458 | register unsigned int i; | |
459 | unsigned len = TYPE_NFIELDS (domain); | |
460 | /* @@ Make VAL into bit offset */ | |
461 | LONGEST val = unpack_long (builtin_type_int, valaddr) << 3; | |
462 | for (i = TYPE_N_BASECLASSES (domain); i < len; i++) | |
463 | { | |
464 | int bitpos = TYPE_FIELD_BITPOS (domain, i); | |
465 | QUIT; | |
466 | if (val == bitpos) | |
467 | break; | |
468 | if (val < bitpos && i != 0) | |
469 | { | |
470 | /* Somehow pointing into a field. */ | |
471 | i -= 1; | |
472 | extra = (val - TYPE_FIELD_BITPOS (domain, i)); | |
473 | if (extra & 0x7) | |
474 | bits = 1; | |
475 | else | |
476 | extra >>= 3; | |
477 | break; | |
478 | } | |
479 | } | |
480 | if (i < len) | |
481 | { | |
482 | char *name; | |
483 | fprintf_filtered (stream, prefix); | |
484 | name = type_name_no_tag (domain); | |
485 | if (name) | |
486 | fputs_filtered (name, stream); | |
487 | else | |
488 | c_type_print_base (domain, stream, 0, 0); | |
489 | fprintf_filtered (stream, "::"); | |
490 | fputs_filtered (TYPE_FIELD_NAME (domain, i), stream); | |
491 | if (extra) | |
492 | fprintf_filtered (stream, " + %d bytes", extra); | |
493 | if (bits) | |
494 | fprintf_filtered (stream, " (offset in bits)"); | |
495 | } | |
496 | else | |
497 | fprintf_filtered (stream, "%d", val >> 3); | |
498 | } | |
499 | ||
500 | void | |
501 | _initialize_cp_valprint () | |
502 | { | |
503 | add_show_from_set | |
504 | (add_set_cmd ("vtbl", class_support, var_boolean, (char *)&vtblprint, | |
505 | "Set printing of C++ virtual function tables.", | |
506 | &setprintlist), | |
507 | &showprintlist); | |
508 | ||
509 | add_show_from_set | |
510 | (add_set_cmd ("object", class_support, var_boolean, (char *)&objectprint, | |
511 | "Set printing of object's derived type based on vtable info.", | |
512 | &setprintlist), | |
513 | &showprintlist); | |
514 | ||
515 | /* Give people the defaults which they are used to. */ | |
516 | objectprint = 0; | |
517 | vtblprint = 0; | |
518 | obstack_begin (&dont_print_obstack, 32 * sizeof (struct type *)); | |
519 | } |