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 | ||
55 | ||
56 | /* BEGIN-FIXME: Hooks into c-valprint.c */ | |
57 | ||
58 | extern int | |
199b2450 | 59 | c_val_print PARAMS ((struct type *, char *, CORE_ADDR, GDB_FILE *, int, int, int, |
a8a69e63 FF |
60 | enum val_prettyprint)); |
61 | /* END-FIXME */ | |
62 | ||
63 | ||
c7da3ed3 FF |
64 | void |
65 | cp_print_class_method (valaddr, type, stream) | |
66 | char *valaddr; | |
67 | struct type *type; | |
199b2450 | 68 | GDB_FILE *stream; |
c7da3ed3 FF |
69 | { |
70 | struct type *domain; | |
72cd0384 RP |
71 | struct fn_field *f = NULL; |
72 | int j = 0; | |
c7da3ed3 FF |
73 | int len2; |
74 | int offset; | |
75 | char *kind = ""; | |
76 | CORE_ADDR addr; | |
77 | struct symbol *sym; | |
78 | unsigned len; | |
79 | unsigned int i; | |
80 | ||
30d20d15 | 81 | check_stub_type (TYPE_TARGET_TYPE (type)); |
c7da3ed3 | 82 | domain = TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)); |
30d20d15 PS |
83 | if (domain == (struct type *)NULL) |
84 | { | |
85 | fprintf_filtered (stream, "<unknown>"); | |
86 | return; | |
87 | } | |
c7da3ed3 FF |
88 | addr = unpack_pointer (lookup_pointer_type (builtin_type_void), valaddr); |
89 | if (METHOD_PTR_IS_VIRTUAL (addr)) | |
90 | { | |
91 | offset = METHOD_PTR_TO_VOFFSET (addr); | |
92 | len = TYPE_NFN_FIELDS (domain); | |
93 | for (i = 0; i < len; i++) | |
94 | { | |
95 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
96 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
97 | ||
98 | for (j = 0; j < len2; j++) | |
99 | { | |
100 | QUIT; | |
101 | if (TYPE_FN_FIELD_VOFFSET (f, j) == offset) | |
102 | { | |
103 | kind = "virtual "; | |
104 | goto common; | |
105 | } | |
106 | } | |
107 | } | |
108 | } | |
109 | else | |
110 | { | |
111 | sym = find_pc_function (addr); | |
112 | if (sym == 0) | |
113 | { | |
114 | error ("invalid pointer to member function"); | |
115 | } | |
116 | len = TYPE_NFN_FIELDS (domain); | |
117 | for (i = 0; i < len; i++) | |
118 | { | |
119 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
120 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
121 | ||
122 | for (j = 0; j < len2; j++) | |
123 | { | |
124 | QUIT; | |
39cb3d04 PS |
125 | if (TYPE_FN_FIELD_STUB (f, j)) |
126 | check_stub_method (domain, i, j); | |
c7da3ed3 FF |
127 | if (STREQ (SYMBOL_NAME (sym), TYPE_FN_FIELD_PHYSNAME (f, j))) |
128 | { | |
129 | goto common; | |
130 | } | |
131 | } | |
132 | } | |
133 | } | |
134 | common: | |
135 | if (i < len) | |
136 | { | |
137 | fprintf_filtered (stream, "&"); | |
138 | c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f, j), stream, 0, 0); | |
199b2450 | 139 | fprintf_unfiltered (stream, kind); |
c7da3ed3 FF |
140 | if (TYPE_FN_FIELD_PHYSNAME (f, j)[0] == '_' |
141 | && TYPE_FN_FIELD_PHYSNAME (f, j)[1] == CPLUS_MARKER) | |
142 | { | |
143 | cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j) + 1, "~", | |
144 | TYPE_FN_FIELDLIST_NAME (domain, i), | |
145 | 0, stream); | |
146 | } | |
147 | else | |
148 | { | |
149 | cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j), "", | |
150 | TYPE_FN_FIELDLIST_NAME (domain, i), | |
151 | 0, stream); | |
152 | } | |
153 | } | |
154 | else | |
155 | { | |
156 | fprintf_filtered (stream, "("); | |
157 | type_print (type, "", stream, -1); | |
158 | fprintf_filtered (stream, ") %d", (int) addr >> 3); | |
159 | } | |
160 | } | |
161 | ||
a8a69e63 FF |
162 | /* Return truth value for assertion that TYPE is of the type |
163 | "pointer to virtual function". */ | |
164 | ||
165 | int | |
166 | cp_is_vtbl_ptr_type(type) | |
167 | struct type *type; | |
168 | { | |
169 | char *typename = type_name_no_tag (type); | |
8f341c15 JK |
170 | /* This was what it was for gcc 2.4.5 and earlier. */ |
171 | static const char vtbl_ptr_name_old[] = | |
a8a69e63 | 172 | { CPLUS_MARKER,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 }; |
8f341c15 | 173 | /* It was changed to this after 2.4.5. */ |
b0dd16a5 KH |
174 | static const char vtbl_ptr_name[] = |
175 | { '_','_','v','t','b','l','_','p','t','r','_','t','y','p','e', 0 }; | |
a8a69e63 | 176 | |
8f341c15 JK |
177 | return (typename != NULL |
178 | && (STREQ (typename, vtbl_ptr_name) | |
179 | || STREQ (typename, vtbl_ptr_name_old))); | |
a8a69e63 FF |
180 | } |
181 | ||
182 | /* Return truth value for the assertion that TYPE is of the type | |
183 | "pointer to virtual function table". */ | |
184 | ||
185 | int | |
186 | cp_is_vtbl_member(type) | |
187 | struct type *type; | |
188 | { | |
189 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
190 | type = TYPE_TARGET_TYPE (type); | |
191 | else | |
192 | return 0; | |
193 | ||
194 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY | |
195 | && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT) | |
196 | /* Virtual functions tables are full of pointers to virtual functions. */ | |
197 | return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type)); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | /* Mutually recursive subroutines of cplus_print_value and c_val_print to | |
202 | print out a structure's fields: cp_print_value_fields and cplus_print_value. | |
203 | ||
204 | TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the | |
205 | same meanings as in cplus_print_value and c_val_print. | |
206 | ||
207 | DONT_PRINT is an array of baseclass types that we | |
208 | should not print, or zero if called from top level. */ | |
209 | ||
210 | void | |
211 | cp_print_value_fields (type, valaddr, stream, format, recurse, pretty, | |
212 | dont_print) | |
213 | struct type *type; | |
214 | char *valaddr; | |
199b2450 | 215 | GDB_FILE *stream; |
a8a69e63 FF |
216 | int format; |
217 | int recurse; | |
218 | enum val_prettyprint pretty; | |
219 | struct type **dont_print; | |
220 | { | |
221 | int i, len, n_baseclasses; | |
222 | ||
223 | check_stub_type (type); | |
224 | ||
225 | fprintf_filtered (stream, "{"); | |
226 | len = TYPE_NFIELDS (type); | |
227 | n_baseclasses = TYPE_N_BASECLASSES (type); | |
228 | ||
229 | /* Print out baseclasses such that we don't print | |
230 | duplicates of virtual baseclasses. */ | |
231 | if (n_baseclasses > 0) | |
232 | cplus_print_value (type, valaddr, stream, format, recurse+1, pretty, | |
233 | dont_print); | |
234 | ||
235 | if (!len && n_baseclasses == 1) | |
236 | fprintf_filtered (stream, "<No data fields>"); | |
237 | else | |
238 | { | |
239 | extern int inspect_it; | |
240 | int fields_seen = 0; | |
241 | ||
242 | for (i = n_baseclasses; i < len; i++) | |
243 | { | |
244 | /* Check if static field */ | |
245 | if (TYPE_FIELD_STATIC (type, i)) | |
246 | continue; | |
247 | if (fields_seen) | |
248 | fprintf_filtered (stream, ", "); | |
249 | else if (n_baseclasses > 0) | |
250 | { | |
251 | if (pretty) | |
252 | { | |
253 | fprintf_filtered (stream, "\n"); | |
254 | print_spaces_filtered (2 + 2 * recurse, stream); | |
255 | fputs_filtered ("members of ", stream); | |
256 | fputs_filtered (type_name_no_tag (type), stream); | |
257 | fputs_filtered (": ", stream); | |
258 | } | |
259 | } | |
260 | fields_seen = 1; | |
261 | ||
262 | if (pretty) | |
263 | { | |
264 | fprintf_filtered (stream, "\n"); | |
265 | print_spaces_filtered (2 + 2 * recurse, stream); | |
266 | } | |
267 | else | |
268 | { | |
269 | wrap_here (n_spaces (2 + 2 * recurse)); | |
270 | } | |
271 | if (inspect_it) | |
272 | { | |
273 | if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR) | |
274 | fputs_filtered ("\"( ptr \"", stream); | |
275 | else | |
276 | fputs_filtered ("\"( nodef \"", stream); | |
5e81259d FF |
277 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
278 | language_cplus, | |
279 | DMGL_PARAMS | DMGL_ANSI); | |
a8a69e63 | 280 | fputs_filtered ("\" \"", stream); |
5e81259d FF |
281 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
282 | language_cplus, | |
283 | DMGL_PARAMS | DMGL_ANSI); | |
a8a69e63 FF |
284 | fputs_filtered ("\") \"", stream); |
285 | } | |
286 | else | |
287 | { | |
5e81259d FF |
288 | fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i), |
289 | language_cplus, | |
290 | DMGL_PARAMS | DMGL_ANSI); | |
a8a69e63 FF |
291 | fputs_filtered (" = ", stream); |
292 | } | |
293 | if (TYPE_FIELD_PACKED (type, i)) | |
294 | { | |
295 | value v; | |
296 | ||
297 | /* Bitfields require special handling, especially due to byte | |
298 | order problems. */ | |
299 | v = value_from_longest (TYPE_FIELD_TYPE (type, i), | |
300 | unpack_field_as_long (type, valaddr, i)); | |
301 | ||
302 | c_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0, | |
303 | stream, format, 0, recurse + 1, pretty); | |
304 | } | |
305 | else | |
306 | { | |
307 | c_val_print (TYPE_FIELD_TYPE (type, i), | |
308 | valaddr + TYPE_FIELD_BITPOS (type, i) / 8, | |
309 | 0, stream, format, 0, recurse + 1, pretty); | |
310 | } | |
311 | } | |
312 | if (pretty) | |
313 | { | |
314 | fprintf_filtered (stream, "\n"); | |
315 | print_spaces_filtered (2 * recurse, stream); | |
316 | } | |
317 | } | |
318 | fprintf_filtered (stream, "}"); | |
319 | } | |
320 | ||
321 | /* Special val_print routine to avoid printing multiple copies of virtual | |
322 | baseclasses. */ | |
323 | ||
324 | static void | |
325 | cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print) | |
326 | struct type *type; | |
327 | char *valaddr; | |
199b2450 | 328 | GDB_FILE *stream; |
a8a69e63 FF |
329 | int format; |
330 | int recurse; | |
331 | enum val_prettyprint pretty; | |
332 | struct type **dont_print; | |
333 | { | |
334 | struct obstack tmp_obstack; | |
335 | struct type **last_dont_print | |
336 | = (struct type **)obstack_next_free (&dont_print_obstack); | |
337 | int i, n_baseclasses = TYPE_N_BASECLASSES (type); | |
338 | ||
339 | if (dont_print == 0) | |
340 | { | |
341 | /* If we're at top level, carve out a completely fresh | |
342 | chunk of the obstack and use that until this particular | |
343 | invocation returns. */ | |
344 | tmp_obstack = dont_print_obstack; | |
345 | /* Bump up the high-water mark. Now alpha is omega. */ | |
346 | obstack_finish (&dont_print_obstack); | |
347 | } | |
348 | ||
349 | for (i = 0; i < n_baseclasses; i++) | |
350 | { | |
351 | char *baddr; | |
352 | int err; | |
1410f5f1 | 353 | char *basename = TYPE_NAME (TYPE_BASECLASS (type, i)); |
a8a69e63 FF |
354 | |
355 | if (BASETYPE_VIA_VIRTUAL (type, i)) | |
356 | { | |
357 | struct type **first_dont_print | |
358 | = (struct type **)obstack_base (&dont_print_obstack); | |
359 | ||
360 | int j = (struct type **)obstack_next_free (&dont_print_obstack) | |
361 | - first_dont_print; | |
362 | ||
363 | while (--j >= 0) | |
364 | if (TYPE_BASECLASS (type, i) == first_dont_print[j]) | |
365 | goto flush_it; | |
366 | ||
367 | obstack_ptr_grow (&dont_print_obstack, TYPE_BASECLASS (type, i)); | |
368 | } | |
369 | ||
370 | /* Fix to use baseclass_offset instead. FIXME */ | |
371 | baddr = baseclass_addr (type, i, valaddr, 0, &err); | |
372 | if (err == 0 && baddr == 0) | |
1410f5f1 JK |
373 | error ("could not find virtual baseclass %s\n", |
374 | basename ? basename : ""); | |
a8a69e63 FF |
375 | |
376 | if (pretty) | |
377 | { | |
378 | fprintf_filtered (stream, "\n"); | |
379 | print_spaces_filtered (2 * recurse, stream); | |
380 | } | |
381 | fputs_filtered ("<", stream); | |
1410f5f1 JK |
382 | /* Not sure what the best notation is in the case where there is no |
383 | baseclass name. */ | |
384 | fputs_filtered (basename ? basename : "", stream); | |
a8a69e63 FF |
385 | fputs_filtered ("> = ", stream); |
386 | if (err != 0) | |
5573d7d4 JK |
387 | fprintf_filtered (stream, |
388 | "<invalid address 0x%lx>", (unsigned long) baddr); | |
a8a69e63 FF |
389 | else |
390 | cp_print_value_fields (TYPE_BASECLASS (type, i), baddr, stream, format, | |
391 | recurse, pretty, | |
392 | (struct type **) obstack_base (&dont_print_obstack)); | |
393 | fputs_filtered (", ", stream); | |
394 | ||
395 | flush_it: | |
396 | ; | |
397 | } | |
398 | ||
399 | if (dont_print == 0) | |
400 | { | |
401 | /* Free the space used to deal with the printing | |
402 | of this type from top level. */ | |
403 | obstack_free (&dont_print_obstack, last_dont_print); | |
404 | /* Reset watermark so that we can continue protecting | |
405 | ourselves from whatever we were protecting ourselves. */ | |
406 | dont_print_obstack = tmp_obstack; | |
407 | } | |
408 | } | |
409 | ||
410 | void | |
411 | cp_print_class_member (valaddr, domain, stream, prefix) | |
412 | char *valaddr; | |
413 | struct type *domain; | |
199b2450 | 414 | GDB_FILE *stream; |
a8a69e63 FF |
415 | char *prefix; |
416 | { | |
417 | ||
418 | /* VAL is a byte offset into the structure type DOMAIN. | |
419 | Find the name of the field for that offset and | |
420 | print it. */ | |
421 | int extra = 0; | |
422 | int bits = 0; | |
423 | register unsigned int i; | |
424 | unsigned len = TYPE_NFIELDS (domain); | |
425 | /* @@ Make VAL into bit offset */ | |
426 | LONGEST val = unpack_long (builtin_type_int, valaddr) << 3; | |
427 | for (i = TYPE_N_BASECLASSES (domain); i < len; i++) | |
428 | { | |
429 | int bitpos = TYPE_FIELD_BITPOS (domain, i); | |
430 | QUIT; | |
431 | if (val == bitpos) | |
432 | break; | |
433 | if (val < bitpos && i != 0) | |
434 | { | |
435 | /* Somehow pointing into a field. */ | |
436 | i -= 1; | |
437 | extra = (val - TYPE_FIELD_BITPOS (domain, i)); | |
438 | if (extra & 0x7) | |
439 | bits = 1; | |
440 | else | |
441 | extra >>= 3; | |
442 | break; | |
443 | } | |
444 | } | |
445 | if (i < len) | |
446 | { | |
447 | char *name; | |
448 | fprintf_filtered (stream, prefix); | |
449 | name = type_name_no_tag (domain); | |
450 | if (name) | |
451 | fputs_filtered (name, stream); | |
452 | else | |
453 | c_type_print_base (domain, stream, 0, 0); | |
454 | fprintf_filtered (stream, "::"); | |
455 | fputs_filtered (TYPE_FIELD_NAME (domain, i), stream); | |
456 | if (extra) | |
457 | fprintf_filtered (stream, " + %d bytes", extra); | |
458 | if (bits) | |
459 | fprintf_filtered (stream, " (offset in bits)"); | |
460 | } | |
461 | else | |
462 | fprintf_filtered (stream, "%d", val >> 3); | |
463 | } | |
464 | ||
465 | void | |
466 | _initialize_cp_valprint () | |
467 | { | |
468 | add_show_from_set | |
469 | (add_set_cmd ("vtbl", class_support, var_boolean, (char *)&vtblprint, | |
470 | "Set printing of C++ virtual function tables.", | |
471 | &setprintlist), | |
472 | &showprintlist); | |
473 | ||
474 | add_show_from_set | |
475 | (add_set_cmd ("object", class_support, var_boolean, (char *)&objectprint, | |
476 | "Set printing of object's derived type based on vtable info.", | |
477 | &setprintlist), | |
478 | &showprintlist); | |
479 | ||
480 | /* Give people the defaults which they are used to. */ | |
481 | objectprint = 0; | |
482 | vtblprint = 0; | |
483 | obstack_begin (&dont_print_obstack, 32 * sizeof (struct type *)); | |
484 | } |