Commit | Line | Data |
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c906108c | 1 | /* Low level packing and unpacking of values for GDB, the GNU Debugger. |
b6ba6518 KB |
2 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
3 | 1996, 1997, 1998, 1999, 2000 | |
c906108c SS |
4 | Free Software Foundation, Inc. |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "gdb_string.h" | |
25 | #include "symtab.h" | |
26 | #include "gdbtypes.h" | |
27 | #include "value.h" | |
28 | #include "gdbcore.h" | |
29 | #include "frame.h" | |
30 | #include "command.h" | |
31 | #include "gdbcmd.h" | |
32 | #include "target.h" | |
33 | #include "language.h" | |
34 | #include "scm-lang.h" | |
35 | #include "demangle.h" | |
36 | ||
37 | /* Prototypes for exported functions. */ | |
38 | ||
a14ed312 | 39 | void _initialize_values (void); |
c906108c SS |
40 | |
41 | /* Prototypes for local functions. */ | |
42 | ||
a14ed312 | 43 | static value_ptr value_headof (value_ptr, struct type *, struct type *); |
c906108c | 44 | |
a14ed312 | 45 | static void show_values (char *, int); |
c906108c | 46 | |
a14ed312 | 47 | static void show_convenience (char *, int); |
c906108c | 48 | |
a14ed312 | 49 | static int vb_match (struct type *, int, struct type *); |
c906108c SS |
50 | |
51 | /* The value-history records all the values printed | |
52 | by print commands during this session. Each chunk | |
53 | records 60 consecutive values. The first chunk on | |
54 | the chain records the most recent values. | |
55 | The total number of values is in value_history_count. */ | |
56 | ||
57 | #define VALUE_HISTORY_CHUNK 60 | |
58 | ||
59 | struct value_history_chunk | |
c5aa993b JM |
60 | { |
61 | struct value_history_chunk *next; | |
62 | value_ptr values[VALUE_HISTORY_CHUNK]; | |
63 | }; | |
c906108c SS |
64 | |
65 | /* Chain of chunks now in use. */ | |
66 | ||
67 | static struct value_history_chunk *value_history_chain; | |
68 | ||
69 | static int value_history_count; /* Abs number of last entry stored */ | |
70 | \f | |
71 | /* List of all value objects currently allocated | |
72 | (except for those released by calls to release_value) | |
73 | This is so they can be freed after each command. */ | |
74 | ||
75 | static value_ptr all_values; | |
76 | ||
77 | /* Allocate a value that has the correct length for type TYPE. */ | |
78 | ||
79 | value_ptr | |
fba45db2 | 80 | allocate_value (struct type *type) |
c906108c SS |
81 | { |
82 | register value_ptr val; | |
83 | struct type *atype = check_typedef (type); | |
84 | ||
85 | val = (struct value *) xmalloc (sizeof (struct value) + TYPE_LENGTH (atype)); | |
86 | VALUE_NEXT (val) = all_values; | |
87 | all_values = val; | |
88 | VALUE_TYPE (val) = type; | |
89 | VALUE_ENCLOSING_TYPE (val) = type; | |
90 | VALUE_LVAL (val) = not_lval; | |
91 | VALUE_ADDRESS (val) = 0; | |
92 | VALUE_FRAME (val) = 0; | |
93 | VALUE_OFFSET (val) = 0; | |
94 | VALUE_BITPOS (val) = 0; | |
95 | VALUE_BITSIZE (val) = 0; | |
96 | VALUE_REGNO (val) = -1; | |
97 | VALUE_LAZY (val) = 0; | |
98 | VALUE_OPTIMIZED_OUT (val) = 0; | |
99 | VALUE_BFD_SECTION (val) = NULL; | |
100 | VALUE_EMBEDDED_OFFSET (val) = 0; | |
101 | VALUE_POINTED_TO_OFFSET (val) = 0; | |
102 | val->modifiable = 1; | |
103 | return val; | |
104 | } | |
105 | ||
106 | /* Allocate a value that has the correct length | |
107 | for COUNT repetitions type TYPE. */ | |
108 | ||
109 | value_ptr | |
fba45db2 | 110 | allocate_repeat_value (struct type *type, int count) |
c906108c | 111 | { |
c5aa993b | 112 | int low_bound = current_language->string_lower_bound; /* ??? */ |
c906108c SS |
113 | /* FIXME-type-allocation: need a way to free this type when we are |
114 | done with it. */ | |
115 | struct type *range_type | |
c5aa993b JM |
116 | = create_range_type ((struct type *) NULL, builtin_type_int, |
117 | low_bound, count + low_bound - 1); | |
c906108c SS |
118 | /* FIXME-type-allocation: need a way to free this type when we are |
119 | done with it. */ | |
120 | return allocate_value (create_array_type ((struct type *) NULL, | |
121 | type, range_type)); | |
122 | } | |
123 | ||
124 | /* Return a mark in the value chain. All values allocated after the | |
125 | mark is obtained (except for those released) are subject to being freed | |
126 | if a subsequent value_free_to_mark is passed the mark. */ | |
127 | value_ptr | |
fba45db2 | 128 | value_mark (void) |
c906108c SS |
129 | { |
130 | return all_values; | |
131 | } | |
132 | ||
133 | /* Free all values allocated since MARK was obtained by value_mark | |
134 | (except for those released). */ | |
135 | void | |
fba45db2 | 136 | value_free_to_mark (value_ptr mark) |
c906108c SS |
137 | { |
138 | value_ptr val, next; | |
139 | ||
140 | for (val = all_values; val && val != mark; val = next) | |
141 | { | |
142 | next = VALUE_NEXT (val); | |
143 | value_free (val); | |
144 | } | |
145 | all_values = val; | |
146 | } | |
147 | ||
148 | /* Free all the values that have been allocated (except for those released). | |
149 | Called after each command, successful or not. */ | |
150 | ||
151 | void | |
fba45db2 | 152 | free_all_values (void) |
c906108c SS |
153 | { |
154 | register value_ptr val, next; | |
155 | ||
156 | for (val = all_values; val; val = next) | |
157 | { | |
158 | next = VALUE_NEXT (val); | |
159 | value_free (val); | |
160 | } | |
161 | ||
162 | all_values = 0; | |
163 | } | |
164 | ||
165 | /* Remove VAL from the chain all_values | |
166 | so it will not be freed automatically. */ | |
167 | ||
168 | void | |
fba45db2 | 169 | release_value (register value_ptr val) |
c906108c SS |
170 | { |
171 | register value_ptr v; | |
172 | ||
173 | if (all_values == val) | |
174 | { | |
175 | all_values = val->next; | |
176 | return; | |
177 | } | |
178 | ||
179 | for (v = all_values; v; v = v->next) | |
180 | { | |
181 | if (v->next == val) | |
182 | { | |
183 | v->next = val->next; | |
184 | break; | |
185 | } | |
186 | } | |
187 | } | |
188 | ||
189 | /* Release all values up to mark */ | |
190 | value_ptr | |
fba45db2 | 191 | value_release_to_mark (value_ptr mark) |
c906108c SS |
192 | { |
193 | value_ptr val, next; | |
194 | ||
195 | for (val = next = all_values; next; next = VALUE_NEXT (next)) | |
196 | if (VALUE_NEXT (next) == mark) | |
197 | { | |
198 | all_values = VALUE_NEXT (next); | |
199 | VALUE_NEXT (next) = 0; | |
200 | return val; | |
201 | } | |
202 | all_values = 0; | |
203 | return val; | |
204 | } | |
205 | ||
206 | /* Return a copy of the value ARG. | |
207 | It contains the same contents, for same memory address, | |
208 | but it's a different block of storage. */ | |
209 | ||
210 | value_ptr | |
fba45db2 | 211 | value_copy (value_ptr arg) |
c906108c SS |
212 | { |
213 | register struct type *encl_type = VALUE_ENCLOSING_TYPE (arg); | |
214 | register value_ptr val = allocate_value (encl_type); | |
215 | VALUE_TYPE (val) = VALUE_TYPE (arg); | |
216 | VALUE_LVAL (val) = VALUE_LVAL (arg); | |
217 | VALUE_ADDRESS (val) = VALUE_ADDRESS (arg); | |
218 | VALUE_OFFSET (val) = VALUE_OFFSET (arg); | |
219 | VALUE_BITPOS (val) = VALUE_BITPOS (arg); | |
220 | VALUE_BITSIZE (val) = VALUE_BITSIZE (arg); | |
221 | VALUE_FRAME (val) = VALUE_FRAME (arg); | |
222 | VALUE_REGNO (val) = VALUE_REGNO (arg); | |
223 | VALUE_LAZY (val) = VALUE_LAZY (arg); | |
224 | VALUE_OPTIMIZED_OUT (val) = VALUE_OPTIMIZED_OUT (arg); | |
225 | VALUE_EMBEDDED_OFFSET (val) = VALUE_EMBEDDED_OFFSET (arg); | |
226 | VALUE_POINTED_TO_OFFSET (val) = VALUE_POINTED_TO_OFFSET (arg); | |
227 | VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (arg); | |
228 | val->modifiable = arg->modifiable; | |
229 | if (!VALUE_LAZY (val)) | |
230 | { | |
231 | memcpy (VALUE_CONTENTS_ALL_RAW (val), VALUE_CONTENTS_ALL_RAW (arg), | |
232 | TYPE_LENGTH (VALUE_ENCLOSING_TYPE (arg))); | |
233 | ||
234 | } | |
235 | return val; | |
236 | } | |
237 | \f | |
238 | /* Access to the value history. */ | |
239 | ||
240 | /* Record a new value in the value history. | |
241 | Returns the absolute history index of the entry. | |
242 | Result of -1 indicates the value was not saved; otherwise it is the | |
243 | value history index of this new item. */ | |
244 | ||
245 | int | |
fba45db2 | 246 | record_latest_value (value_ptr val) |
c906108c SS |
247 | { |
248 | int i; | |
249 | ||
250 | /* We don't want this value to have anything to do with the inferior anymore. | |
251 | In particular, "set $1 = 50" should not affect the variable from which | |
252 | the value was taken, and fast watchpoints should be able to assume that | |
253 | a value on the value history never changes. */ | |
254 | if (VALUE_LAZY (val)) | |
255 | value_fetch_lazy (val); | |
256 | /* We preserve VALUE_LVAL so that the user can find out where it was fetched | |
257 | from. This is a bit dubious, because then *&$1 does not just return $1 | |
258 | but the current contents of that location. c'est la vie... */ | |
259 | val->modifiable = 0; | |
260 | release_value (val); | |
261 | ||
262 | /* Here we treat value_history_count as origin-zero | |
263 | and applying to the value being stored now. */ | |
264 | ||
265 | i = value_history_count % VALUE_HISTORY_CHUNK; | |
266 | if (i == 0) | |
267 | { | |
268 | register struct value_history_chunk *new | |
c5aa993b JM |
269 | = (struct value_history_chunk *) |
270 | xmalloc (sizeof (struct value_history_chunk)); | |
c906108c SS |
271 | memset (new->values, 0, sizeof new->values); |
272 | new->next = value_history_chain; | |
273 | value_history_chain = new; | |
274 | } | |
275 | ||
276 | value_history_chain->values[i] = val; | |
277 | ||
278 | /* Now we regard value_history_count as origin-one | |
279 | and applying to the value just stored. */ | |
280 | ||
281 | return ++value_history_count; | |
282 | } | |
283 | ||
284 | /* Return a copy of the value in the history with sequence number NUM. */ | |
285 | ||
286 | value_ptr | |
fba45db2 | 287 | access_value_history (int num) |
c906108c SS |
288 | { |
289 | register struct value_history_chunk *chunk; | |
290 | register int i; | |
291 | register int absnum = num; | |
292 | ||
293 | if (absnum <= 0) | |
294 | absnum += value_history_count; | |
295 | ||
296 | if (absnum <= 0) | |
297 | { | |
298 | if (num == 0) | |
299 | error ("The history is empty."); | |
300 | else if (num == 1) | |
301 | error ("There is only one value in the history."); | |
302 | else | |
303 | error ("History does not go back to $$%d.", -num); | |
304 | } | |
305 | if (absnum > value_history_count) | |
306 | error ("History has not yet reached $%d.", absnum); | |
307 | ||
308 | absnum--; | |
309 | ||
310 | /* Now absnum is always absolute and origin zero. */ | |
311 | ||
312 | chunk = value_history_chain; | |
313 | for (i = (value_history_count - 1) / VALUE_HISTORY_CHUNK - absnum / VALUE_HISTORY_CHUNK; | |
314 | i > 0; i--) | |
315 | chunk = chunk->next; | |
316 | ||
317 | return value_copy (chunk->values[absnum % VALUE_HISTORY_CHUNK]); | |
318 | } | |
319 | ||
320 | /* Clear the value history entirely. | |
321 | Must be done when new symbol tables are loaded, | |
322 | because the type pointers become invalid. */ | |
323 | ||
324 | void | |
fba45db2 | 325 | clear_value_history (void) |
c906108c SS |
326 | { |
327 | register struct value_history_chunk *next; | |
328 | register int i; | |
329 | register value_ptr val; | |
330 | ||
331 | while (value_history_chain) | |
332 | { | |
333 | for (i = 0; i < VALUE_HISTORY_CHUNK; i++) | |
334 | if ((val = value_history_chain->values[i]) != NULL) | |
b8c9b27d | 335 | xfree (val); |
c906108c | 336 | next = value_history_chain->next; |
b8c9b27d | 337 | xfree (value_history_chain); |
c906108c SS |
338 | value_history_chain = next; |
339 | } | |
340 | value_history_count = 0; | |
341 | } | |
342 | ||
343 | static void | |
fba45db2 | 344 | show_values (char *num_exp, int from_tty) |
c906108c SS |
345 | { |
346 | register int i; | |
347 | register value_ptr val; | |
348 | static int num = 1; | |
349 | ||
350 | if (num_exp) | |
351 | { | |
c5aa993b JM |
352 | /* "info history +" should print from the stored position. |
353 | "info history <exp>" should print around value number <exp>. */ | |
c906108c | 354 | if (num_exp[0] != '+' || num_exp[1] != '\0') |
bb518678 | 355 | num = parse_and_eval_long (num_exp) - 5; |
c906108c SS |
356 | } |
357 | else | |
358 | { | |
359 | /* "info history" means print the last 10 values. */ | |
360 | num = value_history_count - 9; | |
361 | } | |
362 | ||
363 | if (num <= 0) | |
364 | num = 1; | |
365 | ||
366 | for (i = num; i < num + 10 && i <= value_history_count; i++) | |
367 | { | |
368 | val = access_value_history (i); | |
369 | printf_filtered ("$%d = ", i); | |
370 | value_print (val, gdb_stdout, 0, Val_pretty_default); | |
371 | printf_filtered ("\n"); | |
372 | } | |
373 | ||
374 | /* The next "info history +" should start after what we just printed. */ | |
375 | num += 10; | |
376 | ||
377 | /* Hitting just return after this command should do the same thing as | |
378 | "info history +". If num_exp is null, this is unnecessary, since | |
379 | "info history +" is not useful after "info history". */ | |
380 | if (from_tty && num_exp) | |
381 | { | |
382 | num_exp[0] = '+'; | |
383 | num_exp[1] = '\0'; | |
384 | } | |
385 | } | |
386 | \f | |
387 | /* Internal variables. These are variables within the debugger | |
388 | that hold values assigned by debugger commands. | |
389 | The user refers to them with a '$' prefix | |
390 | that does not appear in the variable names stored internally. */ | |
391 | ||
392 | static struct internalvar *internalvars; | |
393 | ||
394 | /* Look up an internal variable with name NAME. NAME should not | |
395 | normally include a dollar sign. | |
396 | ||
397 | If the specified internal variable does not exist, | |
398 | one is created, with a void value. */ | |
399 | ||
400 | struct internalvar * | |
fba45db2 | 401 | lookup_internalvar (char *name) |
c906108c SS |
402 | { |
403 | register struct internalvar *var; | |
404 | ||
405 | for (var = internalvars; var; var = var->next) | |
406 | if (STREQ (var->name, name)) | |
407 | return var; | |
408 | ||
409 | var = (struct internalvar *) xmalloc (sizeof (struct internalvar)); | |
410 | var->name = concat (name, NULL); | |
411 | var->value = allocate_value (builtin_type_void); | |
412 | release_value (var->value); | |
413 | var->next = internalvars; | |
414 | internalvars = var; | |
415 | return var; | |
416 | } | |
417 | ||
418 | value_ptr | |
fba45db2 | 419 | value_of_internalvar (struct internalvar *var) |
c906108c SS |
420 | { |
421 | register value_ptr val; | |
422 | ||
423 | #ifdef IS_TRAPPED_INTERNALVAR | |
424 | if (IS_TRAPPED_INTERNALVAR (var->name)) | |
425 | return VALUE_OF_TRAPPED_INTERNALVAR (var); | |
c5aa993b | 426 | #endif |
c906108c SS |
427 | |
428 | val = value_copy (var->value); | |
429 | if (VALUE_LAZY (val)) | |
430 | value_fetch_lazy (val); | |
431 | VALUE_LVAL (val) = lval_internalvar; | |
432 | VALUE_INTERNALVAR (val) = var; | |
433 | return val; | |
434 | } | |
435 | ||
436 | void | |
fba45db2 KB |
437 | set_internalvar_component (struct internalvar *var, int offset, int bitpos, |
438 | int bitsize, value_ptr newval) | |
c906108c SS |
439 | { |
440 | register char *addr = VALUE_CONTENTS (var->value) + offset; | |
441 | ||
442 | #ifdef IS_TRAPPED_INTERNALVAR | |
443 | if (IS_TRAPPED_INTERNALVAR (var->name)) | |
444 | SET_TRAPPED_INTERNALVAR (var, newval, bitpos, bitsize, offset); | |
445 | #endif | |
446 | ||
447 | if (bitsize) | |
448 | modify_field (addr, value_as_long (newval), | |
449 | bitpos, bitsize); | |
450 | else | |
451 | memcpy (addr, VALUE_CONTENTS (newval), TYPE_LENGTH (VALUE_TYPE (newval))); | |
452 | } | |
453 | ||
454 | void | |
fba45db2 | 455 | set_internalvar (struct internalvar *var, value_ptr val) |
c906108c SS |
456 | { |
457 | value_ptr newval; | |
458 | ||
459 | #ifdef IS_TRAPPED_INTERNALVAR | |
460 | if (IS_TRAPPED_INTERNALVAR (var->name)) | |
461 | SET_TRAPPED_INTERNALVAR (var, val, 0, 0, 0); | |
462 | #endif | |
463 | ||
464 | newval = value_copy (val); | |
465 | newval->modifiable = 1; | |
466 | ||
467 | /* Force the value to be fetched from the target now, to avoid problems | |
468 | later when this internalvar is referenced and the target is gone or | |
469 | has changed. */ | |
470 | if (VALUE_LAZY (newval)) | |
471 | value_fetch_lazy (newval); | |
472 | ||
473 | /* Begin code which must not call error(). If var->value points to | |
474 | something free'd, an error() obviously leaves a dangling pointer. | |
475 | But we also get a danling pointer if var->value points to | |
476 | something in the value chain (i.e., before release_value is | |
477 | called), because after the error free_all_values will get called before | |
478 | long. */ | |
b8c9b27d | 479 | xfree (var->value); |
c906108c SS |
480 | var->value = newval; |
481 | release_value (newval); | |
482 | /* End code which must not call error(). */ | |
483 | } | |
484 | ||
485 | char * | |
fba45db2 | 486 | internalvar_name (struct internalvar *var) |
c906108c SS |
487 | { |
488 | return var->name; | |
489 | } | |
490 | ||
491 | /* Free all internalvars. Done when new symtabs are loaded, | |
492 | because that makes the values invalid. */ | |
493 | ||
494 | void | |
fba45db2 | 495 | clear_internalvars (void) |
c906108c SS |
496 | { |
497 | register struct internalvar *var; | |
498 | ||
499 | while (internalvars) | |
500 | { | |
501 | var = internalvars; | |
502 | internalvars = var->next; | |
b8c9b27d KB |
503 | xfree (var->name); |
504 | xfree (var->value); | |
505 | xfree (var); | |
c906108c SS |
506 | } |
507 | } | |
508 | ||
509 | static void | |
fba45db2 | 510 | show_convenience (char *ignore, int from_tty) |
c906108c SS |
511 | { |
512 | register struct internalvar *var; | |
513 | int varseen = 0; | |
514 | ||
515 | for (var = internalvars; var; var = var->next) | |
516 | { | |
517 | #ifdef IS_TRAPPED_INTERNALVAR | |
518 | if (IS_TRAPPED_INTERNALVAR (var->name)) | |
519 | continue; | |
520 | #endif | |
521 | if (!varseen) | |
522 | { | |
523 | varseen = 1; | |
524 | } | |
525 | printf_filtered ("$%s = ", var->name); | |
526 | value_print (var->value, gdb_stdout, 0, Val_pretty_default); | |
527 | printf_filtered ("\n"); | |
528 | } | |
529 | if (!varseen) | |
530 | printf_unfiltered ("No debugger convenience variables now defined.\n\ | |
531 | Convenience variables have names starting with \"$\";\n\ | |
532 | use \"set\" as in \"set $foo = 5\" to define them.\n"); | |
533 | } | |
534 | \f | |
535 | /* Extract a value as a C number (either long or double). | |
536 | Knows how to convert fixed values to double, or | |
537 | floating values to long. | |
538 | Does not deallocate the value. */ | |
539 | ||
540 | LONGEST | |
fba45db2 | 541 | value_as_long (register value_ptr val) |
c906108c SS |
542 | { |
543 | /* This coerces arrays and functions, which is necessary (e.g. | |
544 | in disassemble_command). It also dereferences references, which | |
545 | I suspect is the most logical thing to do. */ | |
546 | COERCE_ARRAY (val); | |
547 | return unpack_long (VALUE_TYPE (val), VALUE_CONTENTS (val)); | |
548 | } | |
549 | ||
550 | DOUBLEST | |
fba45db2 | 551 | value_as_double (register value_ptr val) |
c906108c SS |
552 | { |
553 | DOUBLEST foo; | |
554 | int inv; | |
c5aa993b | 555 | |
c906108c SS |
556 | foo = unpack_double (VALUE_TYPE (val), VALUE_CONTENTS (val), &inv); |
557 | if (inv) | |
558 | error ("Invalid floating value found in program."); | |
559 | return foo; | |
560 | } | |
4478b372 JB |
561 | /* Extract a value as a C pointer. Does not deallocate the value. |
562 | Note that val's type may not actually be a pointer; value_as_long | |
563 | handles all the cases. */ | |
c906108c | 564 | CORE_ADDR |
fba45db2 | 565 | value_as_pointer (value_ptr val) |
c906108c SS |
566 | { |
567 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
568 | whether we want this to be true eventually. */ | |
569 | #if 0 | |
570 | /* ADDR_BITS_REMOVE is wrong if we are being called for a | |
571 | non-address (e.g. argument to "signal", "info break", etc.), or | |
572 | for pointers to char, in which the low bits *are* significant. */ | |
c5aa993b | 573 | return ADDR_BITS_REMOVE (value_as_long (val)); |
c906108c | 574 | #else |
67b2adb2 AC |
575 | COERCE_ARRAY (val); |
576 | /* In converting VAL to an address (CORE_ADDR), any small integers | |
577 | are first cast to a generic pointer. The function unpack_long | |
578 | will then correctly convert that pointer into a canonical address | |
579 | (using POINTER_TO_ADDRESS). | |
580 | ||
581 | Without the cast, the MIPS gets: 0xa0000000 -> (unsigned int) | |
582 | 0xa0000000 -> (LONGEST) 0x00000000a0000000 | |
583 | ||
584 | With the cast, the MIPS gets: 0xa0000000 -> (unsigned int) | |
585 | 0xa0000000 -> (void*) 0xa0000000 -> (LONGEST) 0xffffffffa0000000. | |
586 | ||
587 | If the user specifies an integer that is larger than the target | |
588 | pointer type, it is assumed that it was intentional and the value | |
589 | is converted directly into an ADDRESS. This ensures that no | |
590 | information is discarded. | |
591 | ||
592 | NOTE: The cast operation may eventualy be converted into a TARGET | |
593 | method (see POINTER_TO_ADDRESS() and ADDRESS_TO_POINTER()) so | |
594 | that the TARGET ISA/ABI can apply an arbitrary conversion. | |
595 | ||
596 | NOTE: In pure harvard architectures function and data pointers | |
597 | can be different and may require different integer to pointer | |
598 | conversions. */ | |
599 | if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_INT | |
600 | && TYPE_LENGTH (VALUE_TYPE (val)) <= TYPE_LENGTH (builtin_type_ptr)) | |
601 | { | |
602 | val = value_cast (builtin_type_ptr, val); | |
603 | } | |
604 | return unpack_long (VALUE_TYPE (val), VALUE_CONTENTS (val)); | |
c906108c SS |
605 | #endif |
606 | } | |
607 | \f | |
608 | /* Unpack raw data (copied from debugee, target byte order) at VALADDR | |
609 | as a long, or as a double, assuming the raw data is described | |
610 | by type TYPE. Knows how to convert different sizes of values | |
611 | and can convert between fixed and floating point. We don't assume | |
612 | any alignment for the raw data. Return value is in host byte order. | |
613 | ||
614 | If you want functions and arrays to be coerced to pointers, and | |
615 | references to be dereferenced, call value_as_long() instead. | |
616 | ||
617 | C++: It is assumed that the front-end has taken care of | |
618 | all matters concerning pointers to members. A pointer | |
619 | to member which reaches here is considered to be equivalent | |
620 | to an INT (or some size). After all, it is only an offset. */ | |
621 | ||
622 | LONGEST | |
fba45db2 | 623 | unpack_long (struct type *type, char *valaddr) |
c906108c SS |
624 | { |
625 | register enum type_code code = TYPE_CODE (type); | |
626 | register int len = TYPE_LENGTH (type); | |
627 | register int nosign = TYPE_UNSIGNED (type); | |
628 | ||
629 | if (current_language->la_language == language_scm | |
630 | && is_scmvalue_type (type)) | |
631 | return scm_unpack (type, valaddr, TYPE_CODE_INT); | |
632 | ||
633 | switch (code) | |
634 | { | |
635 | case TYPE_CODE_TYPEDEF: | |
636 | return unpack_long (check_typedef (type), valaddr); | |
637 | case TYPE_CODE_ENUM: | |
638 | case TYPE_CODE_BOOL: | |
639 | case TYPE_CODE_INT: | |
640 | case TYPE_CODE_CHAR: | |
641 | case TYPE_CODE_RANGE: | |
642 | if (nosign) | |
643 | return extract_unsigned_integer (valaddr, len); | |
644 | else | |
645 | return extract_signed_integer (valaddr, len); | |
646 | ||
647 | case TYPE_CODE_FLT: | |
648 | return extract_floating (valaddr, len); | |
649 | ||
650 | case TYPE_CODE_PTR: | |
651 | case TYPE_CODE_REF: | |
652 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
c5aa993b | 653 | whether we want this to be true eventually. */ |
7a292a7a SS |
654 | if (GDB_TARGET_IS_D10V |
655 | && len == 2) | |
c5aa993b | 656 | return D10V_MAKE_DADDR (extract_address (valaddr, len)); |
4478b372 | 657 | return extract_typed_address (valaddr, type); |
c906108c SS |
658 | |
659 | case TYPE_CODE_MEMBER: | |
660 | error ("not implemented: member types in unpack_long"); | |
661 | ||
662 | default: | |
663 | error ("Value can't be converted to integer."); | |
664 | } | |
c5aa993b | 665 | return 0; /* Placate lint. */ |
c906108c SS |
666 | } |
667 | ||
668 | /* Return a double value from the specified type and address. | |
669 | INVP points to an int which is set to 0 for valid value, | |
670 | 1 for invalid value (bad float format). In either case, | |
671 | the returned double is OK to use. Argument is in target | |
672 | format, result is in host format. */ | |
673 | ||
674 | DOUBLEST | |
fba45db2 | 675 | unpack_double (struct type *type, char *valaddr, int *invp) |
c906108c SS |
676 | { |
677 | enum type_code code; | |
678 | int len; | |
679 | int nosign; | |
680 | ||
681 | *invp = 0; /* Assume valid. */ | |
682 | CHECK_TYPEDEF (type); | |
683 | code = TYPE_CODE (type); | |
684 | len = TYPE_LENGTH (type); | |
685 | nosign = TYPE_UNSIGNED (type); | |
686 | if (code == TYPE_CODE_FLT) | |
687 | { | |
688 | #ifdef INVALID_FLOAT | |
689 | if (INVALID_FLOAT (valaddr, len)) | |
690 | { | |
691 | *invp = 1; | |
692 | return 1.234567891011121314; | |
693 | } | |
694 | #endif | |
695 | return extract_floating (valaddr, len); | |
696 | } | |
697 | else if (nosign) | |
698 | { | |
699 | /* Unsigned -- be sure we compensate for signed LONGEST. */ | |
700 | #if !defined (_MSC_VER) || (_MSC_VER > 900) | |
701 | return (ULONGEST) unpack_long (type, valaddr); | |
702 | #else | |
703 | /* FIXME!!! msvc22 doesn't support unsigned __int64 -> double */ | |
704 | return (LONGEST) unpack_long (type, valaddr); | |
705 | #endif /* _MSC_VER */ | |
706 | } | |
707 | else | |
708 | { | |
709 | /* Signed -- we are OK with unpack_long. */ | |
710 | return unpack_long (type, valaddr); | |
711 | } | |
712 | } | |
713 | ||
714 | /* Unpack raw data (copied from debugee, target byte order) at VALADDR | |
715 | as a CORE_ADDR, assuming the raw data is described by type TYPE. | |
716 | We don't assume any alignment for the raw data. Return value is in | |
717 | host byte order. | |
718 | ||
719 | If you want functions and arrays to be coerced to pointers, and | |
720 | references to be dereferenced, call value_as_pointer() instead. | |
721 | ||
722 | C++: It is assumed that the front-end has taken care of | |
723 | all matters concerning pointers to members. A pointer | |
724 | to member which reaches here is considered to be equivalent | |
725 | to an INT (or some size). After all, it is only an offset. */ | |
726 | ||
727 | CORE_ADDR | |
fba45db2 | 728 | unpack_pointer (struct type *type, char *valaddr) |
c906108c SS |
729 | { |
730 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
731 | whether we want this to be true eventually. */ | |
732 | return unpack_long (type, valaddr); | |
733 | } | |
4478b372 | 734 | |
c906108c SS |
735 | \f |
736 | /* Get the value of the FIELDN'th field (which must be static) of TYPE. */ | |
737 | ||
738 | value_ptr | |
fba45db2 | 739 | value_static_field (struct type *type, int fieldno) |
c906108c SS |
740 | { |
741 | CORE_ADDR addr; | |
742 | asection *sect; | |
743 | if (TYPE_FIELD_STATIC_HAS_ADDR (type, fieldno)) | |
744 | { | |
745 | addr = TYPE_FIELD_STATIC_PHYSADDR (type, fieldno); | |
746 | sect = NULL; | |
747 | } | |
748 | else | |
749 | { | |
750 | char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno); | |
751 | struct symbol *sym = lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL); | |
752 | if (sym == NULL) | |
753 | { | |
754 | /* With some compilers, e.g. HP aCC, static data members are reported | |
c5aa993b JM |
755 | as non-debuggable symbols */ |
756 | struct minimal_symbol *msym = lookup_minimal_symbol (phys_name, NULL, NULL); | |
c906108c SS |
757 | if (!msym) |
758 | return NULL; | |
759 | else | |
c5aa993b | 760 | { |
c906108c SS |
761 | addr = SYMBOL_VALUE_ADDRESS (msym); |
762 | sect = SYMBOL_BFD_SECTION (msym); | |
763 | } | |
764 | } | |
765 | else | |
766 | { | |
767 | addr = SYMBOL_VALUE_ADDRESS (sym); | |
768 | sect = SYMBOL_BFD_SECTION (sym); | |
769 | } | |
770 | SET_FIELD_PHYSADDR (TYPE_FIELD (type, fieldno), addr); | |
771 | } | |
772 | return value_at (TYPE_FIELD_TYPE (type, fieldno), addr, sect); | |
773 | } | |
774 | ||
775 | /* Given a value ARG1 (offset by OFFSET bytes) | |
776 | of a struct or union type ARG_TYPE, | |
777 | extract and return the value of one of its (non-static) fields. | |
778 | FIELDNO says which field. */ | |
779 | ||
780 | value_ptr | |
fba45db2 KB |
781 | value_primitive_field (register value_ptr arg1, int offset, |
782 | register int fieldno, register struct type *arg_type) | |
c906108c SS |
783 | { |
784 | register value_ptr v; | |
785 | register struct type *type; | |
786 | ||
787 | CHECK_TYPEDEF (arg_type); | |
788 | type = TYPE_FIELD_TYPE (arg_type, fieldno); | |
789 | ||
790 | /* Handle packed fields */ | |
791 | ||
792 | if (TYPE_FIELD_BITSIZE (arg_type, fieldno)) | |
793 | { | |
794 | v = value_from_longest (type, | |
795 | unpack_field_as_long (arg_type, | |
796 | VALUE_CONTENTS (arg1) | |
c5aa993b | 797 | + offset, |
c906108c SS |
798 | fieldno)); |
799 | VALUE_BITPOS (v) = TYPE_FIELD_BITPOS (arg_type, fieldno) % 8; | |
800 | VALUE_BITSIZE (v) = TYPE_FIELD_BITSIZE (arg_type, fieldno); | |
2e70b7b9 MS |
801 | VALUE_OFFSET (v) = VALUE_OFFSET (arg1) + offset |
802 | + TYPE_FIELD_BITPOS (arg_type, fieldno) / 8; | |
c906108c SS |
803 | } |
804 | else if (fieldno < TYPE_N_BASECLASSES (arg_type)) | |
805 | { | |
806 | /* This field is actually a base subobject, so preserve the | |
807 | entire object's contents for later references to virtual | |
808 | bases, etc. */ | |
809 | v = allocate_value (VALUE_ENCLOSING_TYPE (arg1)); | |
810 | VALUE_TYPE (v) = arg_type; | |
811 | if (VALUE_LAZY (arg1)) | |
812 | VALUE_LAZY (v) = 1; | |
813 | else | |
814 | memcpy (VALUE_CONTENTS_ALL_RAW (v), VALUE_CONTENTS_ALL_RAW (arg1), | |
815 | TYPE_LENGTH (VALUE_ENCLOSING_TYPE (arg1))); | |
816 | VALUE_OFFSET (v) = VALUE_OFFSET (arg1); | |
817 | VALUE_EMBEDDED_OFFSET (v) | |
c5aa993b JM |
818 | = offset + |
819 | VALUE_EMBEDDED_OFFSET (arg1) + | |
820 | TYPE_FIELD_BITPOS (arg_type, fieldno) / 8; | |
c906108c SS |
821 | } |
822 | else | |
823 | { | |
824 | /* Plain old data member */ | |
825 | offset += TYPE_FIELD_BITPOS (arg_type, fieldno) / 8; | |
826 | v = allocate_value (type); | |
827 | if (VALUE_LAZY (arg1)) | |
828 | VALUE_LAZY (v) = 1; | |
829 | else | |
830 | memcpy (VALUE_CONTENTS_RAW (v), | |
831 | VALUE_CONTENTS_RAW (arg1) + offset, | |
832 | TYPE_LENGTH (type)); | |
833 | VALUE_OFFSET (v) = VALUE_OFFSET (arg1) + offset; | |
834 | } | |
835 | VALUE_LVAL (v) = VALUE_LVAL (arg1); | |
836 | if (VALUE_LVAL (arg1) == lval_internalvar) | |
837 | VALUE_LVAL (v) = lval_internalvar_component; | |
838 | VALUE_ADDRESS (v) = VALUE_ADDRESS (arg1); | |
a88c1392 | 839 | VALUE_REGNO (v) = VALUE_REGNO (arg1); |
c906108c | 840 | /* VALUE_OFFSET (v) = VALUE_OFFSET (arg1) + offset |
c5aa993b | 841 | + TYPE_FIELD_BITPOS (arg_type, fieldno) / 8; */ |
c906108c SS |
842 | return v; |
843 | } | |
844 | ||
845 | /* Given a value ARG1 of a struct or union type, | |
846 | extract and return the value of one of its (non-static) fields. | |
847 | FIELDNO says which field. */ | |
848 | ||
849 | value_ptr | |
fba45db2 | 850 | value_field (register value_ptr arg1, register int fieldno) |
c906108c SS |
851 | { |
852 | return value_primitive_field (arg1, 0, fieldno, VALUE_TYPE (arg1)); | |
853 | } | |
854 | ||
855 | /* Return a non-virtual function as a value. | |
856 | F is the list of member functions which contains the desired method. | |
857 | J is an index into F which provides the desired method. */ | |
858 | ||
859 | value_ptr | |
fba45db2 KB |
860 | value_fn_field (value_ptr *arg1p, struct fn_field *f, int j, struct type *type, |
861 | int offset) | |
c906108c SS |
862 | { |
863 | register value_ptr v; | |
864 | register struct type *ftype = TYPE_FN_FIELD_TYPE (f, j); | |
865 | struct symbol *sym; | |
866 | ||
867 | sym = lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j), | |
868 | 0, VAR_NAMESPACE, 0, NULL); | |
c5aa993b JM |
869 | if (!sym) |
870 | return NULL; | |
c906108c | 871 | /* |
c5aa993b JM |
872 | error ("Internal error: could not find physical method named %s", |
873 | TYPE_FN_FIELD_PHYSNAME (f, j)); | |
874 | */ | |
875 | ||
c906108c SS |
876 | v = allocate_value (ftype); |
877 | VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); | |
878 | VALUE_TYPE (v) = ftype; | |
879 | ||
880 | if (arg1p) | |
c5aa993b JM |
881 | { |
882 | if (type != VALUE_TYPE (*arg1p)) | |
883 | *arg1p = value_ind (value_cast (lookup_pointer_type (type), | |
884 | value_addr (*arg1p))); | |
885 | ||
070ad9f0 | 886 | /* Move the `this' pointer according to the offset. |
c5aa993b JM |
887 | VALUE_OFFSET (*arg1p) += offset; |
888 | */ | |
c906108c SS |
889 | } |
890 | ||
891 | return v; | |
892 | } | |
893 | ||
894 | /* Return a virtual function as a value. | |
895 | ARG1 is the object which provides the virtual function | |
896 | table pointer. *ARG1P is side-effected in calling this function. | |
897 | F is the list of member functions which contains the desired virtual | |
898 | function. | |
899 | J is an index into F which provides the desired virtual function. | |
900 | ||
901 | TYPE is the type in which F is located. */ | |
902 | value_ptr | |
fba45db2 KB |
903 | value_virtual_fn_field (value_ptr *arg1p, struct fn_field *f, int j, |
904 | struct type *type, int offset) | |
c906108c SS |
905 | { |
906 | value_ptr arg1 = *arg1p; | |
907 | struct type *type1 = check_typedef (VALUE_TYPE (arg1)); | |
908 | ||
909 | if (TYPE_HAS_VTABLE (type)) | |
910 | { | |
911 | /* Deal with HP/Taligent runtime model for virtual functions */ | |
912 | value_ptr vp; | |
c5aa993b | 913 | value_ptr argp; /* arg1 cast to base */ |
c5aa993b JM |
914 | CORE_ADDR coreptr; /* pointer to target address */ |
915 | int class_index; /* which class segment pointer to use */ | |
916 | struct type *ftype = TYPE_FN_FIELD_TYPE (f, j); /* method type */ | |
c906108c SS |
917 | |
918 | argp = value_cast (type, *arg1p); | |
919 | ||
920 | if (VALUE_ADDRESS (argp) == 0) | |
c5aa993b JM |
921 | error ("Address of object is null; object may not have been created."); |
922 | ||
c906108c SS |
923 | /* pai: FIXME -- 32x64 possible problem? */ |
924 | /* First word (4 bytes) in object layout is the vtable pointer */ | |
c5aa993b JM |
925 | coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (argp)); /* pai: (temp) */ |
926 | /* + offset + VALUE_EMBEDDED_OFFSET (argp)); */ | |
c906108c SS |
927 | |
928 | if (!coreptr) | |
c5aa993b JM |
929 | error ("Virtual table pointer is null for object; object may not have been created."); |
930 | ||
c906108c SS |
931 | /* pai/1997-05-09 |
932 | * FIXME: The code here currently handles only | |
933 | * the non-RRBC case of the Taligent/HP runtime spec; when RRBC | |
934 | * is introduced, the condition for the "if" below will have to | |
935 | * be changed to be a test for the RRBC case. */ | |
c5aa993b | 936 | |
c906108c | 937 | if (1) |
c5aa993b JM |
938 | { |
939 | /* Non-RRBC case; the virtual function pointers are stored at fixed | |
940 | * offsets in the virtual table. */ | |
941 | ||
942 | /* Retrieve the offset in the virtual table from the debug | |
943 | * info. The offset of the vfunc's entry is in words from | |
944 | * the beginning of the vtable; but first we have to adjust | |
945 | * by HP_ACC_VFUNC_START to account for other entries */ | |
946 | ||
947 | /* pai: FIXME: 32x64 problem here, a word may be 8 bytes in | |
948 | * which case the multiplier should be 8 and values should be long */ | |
949 | vp = value_at (builtin_type_int, | |
950 | coreptr + 4 * (TYPE_FN_FIELD_VOFFSET (f, j) + HP_ACC_VFUNC_START), NULL); | |
951 | ||
952 | coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp)); | |
953 | /* coreptr now contains the address of the virtual function */ | |
954 | /* (Actually, it contains the pointer to the plabel for the function. */ | |
955 | } | |
c906108c | 956 | else |
c5aa993b JM |
957 | { |
958 | /* RRBC case; the virtual function pointers are found by double | |
959 | * indirection through the class segment tables. */ | |
960 | ||
961 | /* Choose class segment depending on type we were passed */ | |
962 | class_index = class_index_in_primary_list (type); | |
963 | ||
964 | /* Find class segment pointer. These are in the vtable slots after | |
965 | * some other entries, so adjust by HP_ACC_VFUNC_START for that. */ | |
966 | /* pai: FIXME 32x64 problem here, if words are 8 bytes long | |
967 | * the multiplier below has to be 8 and value should be long. */ | |
968 | vp = value_at (builtin_type_int, | |
969 | coreptr + 4 * (HP_ACC_VFUNC_START + class_index), NULL); | |
970 | /* Indirect once more, offset by function index */ | |
971 | /* pai: FIXME 32x64 problem here, again multiplier could be 8 and value long */ | |
972 | coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp) + 4 * TYPE_FN_FIELD_VOFFSET (f, j)); | |
973 | vp = value_at (builtin_type_int, coreptr, NULL); | |
974 | coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp)); | |
975 | ||
976 | /* coreptr now contains the address of the virtual function */ | |
977 | /* (Actually, it contains the pointer to the plabel for the function.) */ | |
978 | ||
979 | } | |
c906108c SS |
980 | |
981 | if (!coreptr) | |
c5aa993b | 982 | error ("Address of virtual function is null; error in virtual table?"); |
c906108c | 983 | |
c5aa993b | 984 | /* Wrap this addr in a value and return pointer */ |
c906108c SS |
985 | vp = allocate_value (ftype); |
986 | VALUE_TYPE (vp) = ftype; | |
987 | VALUE_ADDRESS (vp) = coreptr; | |
c5aa993b | 988 | |
c906108c SS |
989 | /* pai: (temp) do we need the value_ind stuff in value_fn_field? */ |
990 | return vp; | |
991 | } | |
c5aa993b JM |
992 | else |
993 | { /* Not using HP/Taligent runtime conventions; so try to | |
994 | * use g++ conventions for virtual table */ | |
995 | ||
c906108c SS |
996 | struct type *entry_type; |
997 | /* First, get the virtual function table pointer. That comes | |
998 | with a strange type, so cast it to type `pointer to long' (which | |
999 | should serve just fine as a function type). Then, index into | |
1000 | the table, and convert final value to appropriate function type. */ | |
1001 | value_ptr entry, vfn, vtbl; | |
c5aa993b JM |
1002 | value_ptr vi = value_from_longest (builtin_type_int, |
1003 | (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j)); | |
c906108c SS |
1004 | struct type *fcontext = TYPE_FN_FIELD_FCONTEXT (f, j); |
1005 | struct type *context; | |
1006 | if (fcontext == NULL) | |
c5aa993b JM |
1007 | /* We don't have an fcontext (e.g. the program was compiled with |
1008 | g++ version 1). Try to get the vtbl from the TYPE_VPTR_BASETYPE. | |
1009 | This won't work right for multiple inheritance, but at least we | |
1010 | should do as well as GDB 3.x did. */ | |
1011 | fcontext = TYPE_VPTR_BASETYPE (type); | |
c906108c SS |
1012 | context = lookup_pointer_type (fcontext); |
1013 | /* Now context is a pointer to the basetype containing the vtbl. */ | |
1014 | if (TYPE_TARGET_TYPE (context) != type1) | |
c5aa993b | 1015 | { |
c906108c SS |
1016 | value_ptr tmp = value_cast (context, value_addr (arg1)); |
1017 | VALUE_POINTED_TO_OFFSET (tmp) = 0; | |
c5aa993b JM |
1018 | arg1 = value_ind (tmp); |
1019 | type1 = check_typedef (VALUE_TYPE (arg1)); | |
1020 | } | |
c906108c SS |
1021 | |
1022 | context = type1; | |
1023 | /* Now context is the basetype containing the vtbl. */ | |
1024 | ||
1025 | /* This type may have been defined before its virtual function table | |
1026 | was. If so, fill in the virtual function table entry for the | |
1027 | type now. */ | |
1028 | if (TYPE_VPTR_FIELDNO (context) < 0) | |
c5aa993b | 1029 | fill_in_vptr_fieldno (context); |
c906108c SS |
1030 | |
1031 | /* The virtual function table is now an array of structures | |
1032 | which have the form { int16 offset, delta; void *pfn; }. */ | |
1033 | vtbl = value_primitive_field (arg1, 0, TYPE_VPTR_FIELDNO (context), | |
1034 | TYPE_VPTR_BASETYPE (context)); | |
c5aa993b | 1035 | |
c906108c | 1036 | /* With older versions of g++, the vtbl field pointed to an array |
c5aa993b | 1037 | of structures. Nowadays it points directly to the structure. */ |
c906108c | 1038 | if (TYPE_CODE (VALUE_TYPE (vtbl)) == TYPE_CODE_PTR |
c5aa993b | 1039 | && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (vtbl))) == TYPE_CODE_ARRAY) |
c906108c SS |
1040 | { |
1041 | /* Handle the case where the vtbl field points to an | |
1042 | array of structures. */ | |
1043 | vtbl = value_ind (vtbl); | |
1044 | ||
1045 | /* Index into the virtual function table. This is hard-coded because | |
1046 | looking up a field is not cheap, and it may be important to save | |
1047 | time, e.g. if the user has set a conditional breakpoint calling | |
1048 | a virtual function. */ | |
1049 | entry = value_subscript (vtbl, vi); | |
1050 | } | |
1051 | else | |
1052 | { | |
1053 | /* Handle the case where the vtbl field points directly to a structure. */ | |
1054 | vtbl = value_add (vtbl, vi); | |
1055 | entry = value_ind (vtbl); | |
1056 | } | |
1057 | ||
1058 | entry_type = check_typedef (VALUE_TYPE (entry)); | |
1059 | ||
1060 | if (TYPE_CODE (entry_type) == TYPE_CODE_STRUCT) | |
c5aa993b JM |
1061 | { |
1062 | /* Move the `this' pointer according to the virtual function table. */ | |
1063 | VALUE_OFFSET (arg1) += value_as_long (value_field (entry, 0)); | |
1064 | ||
1065 | if (!VALUE_LAZY (arg1)) | |
1066 | { | |
1067 | VALUE_LAZY (arg1) = 1; | |
1068 | value_fetch_lazy (arg1); | |
1069 | } | |
1070 | ||
1071 | vfn = value_field (entry, 2); | |
1072 | } | |
c906108c | 1073 | else if (TYPE_CODE (entry_type) == TYPE_CODE_PTR) |
c5aa993b | 1074 | vfn = entry; |
c906108c | 1075 | else |
c5aa993b | 1076 | error ("I'm confused: virtual function table has bad type"); |
c906108c SS |
1077 | /* Reinstantiate the function pointer with the correct type. */ |
1078 | VALUE_TYPE (vfn) = lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j)); | |
1079 | ||
1080 | *arg1p = arg1; | |
1081 | return vfn; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | /* ARG is a pointer to an object we know to be at least | |
1086 | a DTYPE. BTYPE is the most derived basetype that has | |
1087 | already been searched (and need not be searched again). | |
1088 | After looking at the vtables between BTYPE and DTYPE, | |
1089 | return the most derived type we find. The caller must | |
1090 | be satisfied when the return value == DTYPE. | |
1091 | ||
070ad9f0 DB |
1092 | FIXME-tiemann: should work with dossier entries as well. |
1093 | NOTICE - djb: I see no good reason at all to keep this function now that | |
1094 | we have RTTI support. It's used in literally one place, and it's | |
1095 | hard to keep this function up to date when it's purpose is served | |
1096 | by value_rtti_type efficiently. | |
1097 | Consider it gone for 5.1. */ | |
c906108c SS |
1098 | |
1099 | static value_ptr | |
fba45db2 | 1100 | value_headof (value_ptr in_arg, struct type *btype, struct type *dtype) |
c906108c SS |
1101 | { |
1102 | /* First collect the vtables we must look at for this object. */ | |
070ad9f0 | 1103 | value_ptr arg, vtbl; |
c906108c | 1104 | struct symbol *sym; |
c906108c SS |
1105 | char *demangled_name; |
1106 | struct minimal_symbol *msymbol; | |
1107 | ||
1108 | btype = TYPE_VPTR_BASETYPE (dtype); | |
1109 | CHECK_TYPEDEF (btype); | |
1110 | arg = in_arg; | |
1111 | if (btype != dtype) | |
070ad9f0 DB |
1112 | arg = value_cast (lookup_pointer_type (btype), arg); |
1113 | if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF) | |
1114 | { | |
1115 | /* | |
1116 | * Copy the value, but change the type from (T&) to (T*). | |
1117 | * We keep the same location information, which is efficient, | |
1118 | * and allows &(&X) to get the location containing the reference. | |
1119 | */ | |
1120 | arg = value_copy (arg); | |
1121 | VALUE_TYPE (arg) = lookup_pointer_type (TYPE_TARGET_TYPE (VALUE_TYPE (arg))); | |
1122 | } | |
1123 | if (VALUE_ADDRESS(value_field (value_ind(arg), TYPE_VPTR_FIELDNO (btype)))==0) | |
1124 | return arg; | |
1125 | ||
c906108c | 1126 | vtbl = value_ind (value_field (value_ind (arg), TYPE_VPTR_FIELDNO (btype))); |
070ad9f0 DB |
1127 | /* Turn vtable into typeinfo function */ |
1128 | VALUE_OFFSET(vtbl)+=4; | |
c906108c | 1129 | |
070ad9f0 | 1130 | msymbol = lookup_minimal_symbol_by_pc ( value_as_pointer(value_ind(vtbl)) ); |
c906108c | 1131 | if (msymbol == NULL |
070ad9f0 DB |
1132 | || (demangled_name = SYMBOL_NAME (msymbol)) == NULL) |
1133 | { | |
1134 | /* If we expected to find a vtable, but did not, let the user | |
1135 | know that we aren't happy, but don't throw an error. | |
1136 | FIXME: there has to be a better way to do this. */ | |
1137 | struct type *error_type = (struct type *) xmalloc (sizeof (struct type)); | |
1138 | memcpy (error_type, VALUE_TYPE (in_arg), sizeof (struct type)); | |
1139 | TYPE_NAME (error_type) = savestring ("suspicious *", sizeof ("suspicious *")); | |
1140 | VALUE_TYPE (in_arg) = error_type; | |
1141 | return in_arg; | |
1142 | } | |
1143 | demangled_name = cplus_demangle(demangled_name,DMGL_ANSI); | |
1144 | *(strchr (demangled_name, ' ')) = '\0'; | |
c906108c | 1145 | |
c906108c SS |
1146 | sym = lookup_symbol (demangled_name, 0, VAR_NAMESPACE, 0, 0); |
1147 | if (sym == NULL) | |
070ad9f0 DB |
1148 | error ("could not find type declaration for `%s'", demangled_name); |
1149 | ||
1150 | arg = in_arg; | |
c906108c SS |
1151 | VALUE_TYPE (arg) = lookup_pointer_type (SYMBOL_TYPE (sym)); |
1152 | return arg; | |
1153 | } | |
1154 | ||
1155 | /* ARG is a pointer object of type TYPE. If TYPE has virtual | |
1156 | function tables, probe ARG's tables (including the vtables | |
1157 | of its baseclasses) to figure out the most derived type that ARG | |
1158 | could actually be a pointer to. */ | |
1159 | ||
1160 | value_ptr | |
fba45db2 | 1161 | value_from_vtable_info (value_ptr arg, struct type *type) |
c906108c SS |
1162 | { |
1163 | /* Take care of preliminaries. */ | |
1164 | if (TYPE_VPTR_FIELDNO (type) < 0) | |
1165 | fill_in_vptr_fieldno (type); | |
1166 | if (TYPE_VPTR_FIELDNO (type) < 0) | |
1167 | return 0; | |
1168 | ||
1169 | return value_headof (arg, 0, type); | |
1170 | } | |
1171 | ||
1172 | /* Return true if the INDEXth field of TYPE is a virtual baseclass | |
1173 | pointer which is for the base class whose type is BASECLASS. */ | |
1174 | ||
1175 | static int | |
fba45db2 | 1176 | vb_match (struct type *type, int index, struct type *basetype) |
c906108c SS |
1177 | { |
1178 | struct type *fieldtype; | |
1179 | char *name = TYPE_FIELD_NAME (type, index); | |
1180 | char *field_class_name = NULL; | |
1181 | ||
1182 | if (*name != '_') | |
1183 | return 0; | |
1184 | /* gcc 2.4 uses _vb$. */ | |
1185 | if (name[1] == 'v' && name[2] == 'b' && is_cplus_marker (name[3])) | |
1186 | field_class_name = name + 4; | |
1187 | /* gcc 2.5 will use __vb_. */ | |
1188 | if (name[1] == '_' && name[2] == 'v' && name[3] == 'b' && name[4] == '_') | |
1189 | field_class_name = name + 5; | |
1190 | ||
1191 | if (field_class_name == NULL) | |
1192 | /* This field is not a virtual base class pointer. */ | |
1193 | return 0; | |
1194 | ||
1195 | /* It's a virtual baseclass pointer, now we just need to find out whether | |
1196 | it is for this baseclass. */ | |
1197 | fieldtype = TYPE_FIELD_TYPE (type, index); | |
1198 | if (fieldtype == NULL | |
1199 | || TYPE_CODE (fieldtype) != TYPE_CODE_PTR) | |
1200 | /* "Can't happen". */ | |
1201 | return 0; | |
1202 | ||
1203 | /* What we check for is that either the types are equal (needed for | |
1204 | nameless types) or have the same name. This is ugly, and a more | |
1205 | elegant solution should be devised (which would probably just push | |
1206 | the ugliness into symbol reading unless we change the stabs format). */ | |
1207 | if (TYPE_TARGET_TYPE (fieldtype) == basetype) | |
1208 | return 1; | |
1209 | ||
1210 | if (TYPE_NAME (basetype) != NULL | |
1211 | && TYPE_NAME (TYPE_TARGET_TYPE (fieldtype)) != NULL | |
1212 | && STREQ (TYPE_NAME (basetype), | |
1213 | TYPE_NAME (TYPE_TARGET_TYPE (fieldtype)))) | |
1214 | return 1; | |
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | /* Compute the offset of the baseclass which is | |
1219 | the INDEXth baseclass of class TYPE, | |
1220 | for value at VALADDR (in host) at ADDRESS (in target). | |
1221 | The result is the offset of the baseclass value relative | |
1222 | to (the address of)(ARG) + OFFSET. | |
1223 | ||
1224 | -1 is returned on error. */ | |
1225 | ||
1226 | int | |
fba45db2 KB |
1227 | baseclass_offset (struct type *type, int index, char *valaddr, |
1228 | CORE_ADDR address) | |
c906108c SS |
1229 | { |
1230 | struct type *basetype = TYPE_BASECLASS (type, index); | |
1231 | ||
1232 | if (BASETYPE_VIA_VIRTUAL (type, index)) | |
1233 | { | |
1234 | /* Must hunt for the pointer to this virtual baseclass. */ | |
1235 | register int i, len = TYPE_NFIELDS (type); | |
1236 | register int n_baseclasses = TYPE_N_BASECLASSES (type); | |
1237 | ||
1238 | /* First look for the virtual baseclass pointer | |
c5aa993b | 1239 | in the fields. */ |
c906108c SS |
1240 | for (i = n_baseclasses; i < len; i++) |
1241 | { | |
1242 | if (vb_match (type, i, basetype)) | |
1243 | { | |
1244 | CORE_ADDR addr | |
c5aa993b JM |
1245 | = unpack_pointer (TYPE_FIELD_TYPE (type, i), |
1246 | valaddr + (TYPE_FIELD_BITPOS (type, i) / 8)); | |
c906108c SS |
1247 | |
1248 | return addr - (LONGEST) address; | |
1249 | } | |
1250 | } | |
1251 | /* Not in the fields, so try looking through the baseclasses. */ | |
c5aa993b | 1252 | for (i = index + 1; i < n_baseclasses; i++) |
c906108c SS |
1253 | { |
1254 | int boffset = | |
c5aa993b | 1255 | baseclass_offset (type, i, valaddr, address); |
c906108c SS |
1256 | if (boffset) |
1257 | return boffset; | |
1258 | } | |
1259 | /* Not found. */ | |
1260 | return -1; | |
1261 | } | |
1262 | ||
1263 | /* Baseclass is easily computed. */ | |
1264 | return TYPE_BASECLASS_BITPOS (type, index) / 8; | |
1265 | } | |
1266 | \f | |
1267 | /* Unpack a field FIELDNO of the specified TYPE, from the anonymous object at | |
1268 | VALADDR. | |
1269 | ||
1270 | Extracting bits depends on endianness of the machine. Compute the | |
1271 | number of least significant bits to discard. For big endian machines, | |
1272 | we compute the total number of bits in the anonymous object, subtract | |
1273 | off the bit count from the MSB of the object to the MSB of the | |
1274 | bitfield, then the size of the bitfield, which leaves the LSB discard | |
1275 | count. For little endian machines, the discard count is simply the | |
1276 | number of bits from the LSB of the anonymous object to the LSB of the | |
1277 | bitfield. | |
1278 | ||
1279 | If the field is signed, we also do sign extension. */ | |
1280 | ||
1281 | LONGEST | |
fba45db2 | 1282 | unpack_field_as_long (struct type *type, char *valaddr, int fieldno) |
c906108c SS |
1283 | { |
1284 | ULONGEST val; | |
1285 | ULONGEST valmask; | |
1286 | int bitpos = TYPE_FIELD_BITPOS (type, fieldno); | |
1287 | int bitsize = TYPE_FIELD_BITSIZE (type, fieldno); | |
1288 | int lsbcount; | |
1289 | struct type *field_type; | |
1290 | ||
1291 | val = extract_unsigned_integer (valaddr + bitpos / 8, sizeof (val)); | |
1292 | field_type = TYPE_FIELD_TYPE (type, fieldno); | |
1293 | CHECK_TYPEDEF (field_type); | |
1294 | ||
1295 | /* Extract bits. See comment above. */ | |
1296 | ||
1297 | if (BITS_BIG_ENDIAN) | |
1298 | lsbcount = (sizeof val * 8 - bitpos % 8 - bitsize); | |
1299 | else | |
1300 | lsbcount = (bitpos % 8); | |
1301 | val >>= lsbcount; | |
1302 | ||
1303 | /* If the field does not entirely fill a LONGEST, then zero the sign bits. | |
1304 | If the field is signed, and is negative, then sign extend. */ | |
1305 | ||
1306 | if ((bitsize > 0) && (bitsize < 8 * (int) sizeof (val))) | |
1307 | { | |
1308 | valmask = (((ULONGEST) 1) << bitsize) - 1; | |
1309 | val &= valmask; | |
1310 | if (!TYPE_UNSIGNED (field_type)) | |
1311 | { | |
1312 | if (val & (valmask ^ (valmask >> 1))) | |
1313 | { | |
1314 | val |= ~valmask; | |
1315 | } | |
1316 | } | |
1317 | } | |
1318 | return (val); | |
1319 | } | |
1320 | ||
1321 | /* Modify the value of a bitfield. ADDR points to a block of memory in | |
1322 | target byte order; the bitfield starts in the byte pointed to. FIELDVAL | |
1323 | is the desired value of the field, in host byte order. BITPOS and BITSIZE | |
1324 | indicate which bits (in target bit order) comprise the bitfield. */ | |
1325 | ||
1326 | void | |
fba45db2 | 1327 | modify_field (char *addr, LONGEST fieldval, int bitpos, int bitsize) |
c906108c SS |
1328 | { |
1329 | LONGEST oword; | |
1330 | ||
1331 | /* If a negative fieldval fits in the field in question, chop | |
1332 | off the sign extension bits. */ | |
1333 | if (bitsize < (8 * (int) sizeof (fieldval)) | |
1334 | && (~fieldval & ~((1 << (bitsize - 1)) - 1)) == 0) | |
1335 | fieldval = fieldval & ((1 << bitsize) - 1); | |
1336 | ||
1337 | /* Warn if value is too big to fit in the field in question. */ | |
1338 | if (bitsize < (8 * (int) sizeof (fieldval)) | |
c5aa993b | 1339 | && 0 != (fieldval & ~((1 << bitsize) - 1))) |
c906108c SS |
1340 | { |
1341 | /* FIXME: would like to include fieldval in the message, but | |
c5aa993b | 1342 | we don't have a sprintf_longest. */ |
c906108c SS |
1343 | warning ("Value does not fit in %d bits.", bitsize); |
1344 | ||
1345 | /* Truncate it, otherwise adjoining fields may be corrupted. */ | |
1346 | fieldval = fieldval & ((1 << bitsize) - 1); | |
1347 | } | |
1348 | ||
1349 | oword = extract_signed_integer (addr, sizeof oword); | |
1350 | ||
1351 | /* Shifting for bit field depends on endianness of the target machine. */ | |
1352 | if (BITS_BIG_ENDIAN) | |
1353 | bitpos = sizeof (oword) * 8 - bitpos - bitsize; | |
1354 | ||
1355 | /* Mask out old value, while avoiding shifts >= size of oword */ | |
1356 | if (bitsize < 8 * (int) sizeof (oword)) | |
c5aa993b | 1357 | oword &= ~(((((ULONGEST) 1) << bitsize) - 1) << bitpos); |
c906108c | 1358 | else |
c5aa993b | 1359 | oword &= ~((~(ULONGEST) 0) << bitpos); |
c906108c SS |
1360 | oword |= fieldval << bitpos; |
1361 | ||
1362 | store_signed_integer (addr, sizeof oword, oword); | |
1363 | } | |
1364 | \f | |
1365 | /* Convert C numbers into newly allocated values */ | |
1366 | ||
1367 | value_ptr | |
fba45db2 | 1368 | value_from_longest (struct type *type, register LONGEST num) |
c906108c SS |
1369 | { |
1370 | register value_ptr val = allocate_value (type); | |
1371 | register enum type_code code; | |
1372 | register int len; | |
c5aa993b | 1373 | retry: |
c906108c SS |
1374 | code = TYPE_CODE (type); |
1375 | len = TYPE_LENGTH (type); | |
1376 | ||
1377 | switch (code) | |
1378 | { | |
1379 | case TYPE_CODE_TYPEDEF: | |
1380 | type = check_typedef (type); | |
1381 | goto retry; | |
1382 | case TYPE_CODE_INT: | |
1383 | case TYPE_CODE_CHAR: | |
1384 | case TYPE_CODE_ENUM: | |
1385 | case TYPE_CODE_BOOL: | |
1386 | case TYPE_CODE_RANGE: | |
1387 | store_signed_integer (VALUE_CONTENTS_RAW (val), len, num); | |
1388 | break; | |
c5aa993b | 1389 | |
c906108c SS |
1390 | case TYPE_CODE_REF: |
1391 | case TYPE_CODE_PTR: | |
4478b372 | 1392 | store_typed_address (VALUE_CONTENTS_RAW (val), type, (CORE_ADDR) num); |
c906108c | 1393 | break; |
c5aa993b | 1394 | |
c906108c SS |
1395 | default: |
1396 | error ("Unexpected type (%d) encountered for integer constant.", code); | |
1397 | } | |
1398 | return val; | |
1399 | } | |
1400 | ||
4478b372 JB |
1401 | |
1402 | /* Create a value representing a pointer of type TYPE to the address | |
1403 | ADDR. */ | |
1404 | value_ptr | |
1405 | value_from_pointer (struct type *type, CORE_ADDR addr) | |
1406 | { | |
1407 | value_ptr val = allocate_value (type); | |
1408 | store_typed_address (VALUE_CONTENTS_RAW (val), type, addr); | |
1409 | return val; | |
1410 | } | |
1411 | ||
1412 | ||
0f71a2f6 | 1413 | /* Create a value for a string constant to be stored locally |
070ad9f0 | 1414 | (not in the inferior's memory space, but in GDB memory). |
0f71a2f6 JM |
1415 | This is analogous to value_from_longest, which also does not |
1416 | use inferior memory. String shall NOT contain embedded nulls. */ | |
1417 | ||
1418 | value_ptr | |
fba45db2 | 1419 | value_from_string (char *ptr) |
0f71a2f6 JM |
1420 | { |
1421 | value_ptr val; | |
c5aa993b | 1422 | int len = strlen (ptr); |
0f71a2f6 | 1423 | int lowbound = current_language->string_lower_bound; |
c5aa993b JM |
1424 | struct type *rangetype = |
1425 | create_range_type ((struct type *) NULL, | |
1426 | builtin_type_int, | |
1427 | lowbound, len + lowbound - 1); | |
1428 | struct type *stringtype = | |
1429 | create_array_type ((struct type *) NULL, | |
1430 | *current_language->string_char_type, | |
1431 | rangetype); | |
0f71a2f6 JM |
1432 | |
1433 | val = allocate_value (stringtype); | |
1434 | memcpy (VALUE_CONTENTS_RAW (val), ptr, len); | |
1435 | return val; | |
1436 | } | |
1437 | ||
c906108c | 1438 | value_ptr |
fba45db2 | 1439 | value_from_double (struct type *type, DOUBLEST num) |
c906108c SS |
1440 | { |
1441 | register value_ptr val = allocate_value (type); | |
1442 | struct type *base_type = check_typedef (type); | |
1443 | register enum type_code code = TYPE_CODE (base_type); | |
1444 | register int len = TYPE_LENGTH (base_type); | |
1445 | ||
1446 | if (code == TYPE_CODE_FLT) | |
1447 | { | |
1448 | store_floating (VALUE_CONTENTS_RAW (val), len, num); | |
1449 | } | |
1450 | else | |
1451 | error ("Unexpected type encountered for floating constant."); | |
1452 | ||
1453 | return val; | |
1454 | } | |
1455 | \f | |
1456 | /* Deal with the value that is "about to be returned". */ | |
1457 | ||
1458 | /* Return the value that a function returning now | |
1459 | would be returning to its caller, assuming its type is VALTYPE. | |
1460 | RETBUF is where we look for what ought to be the contents | |
1461 | of the registers (in raw form). This is because it is often | |
1462 | desirable to restore old values to those registers | |
1463 | after saving the contents of interest, and then call | |
1464 | this function using the saved values. | |
1465 | struct_return is non-zero when the function in question is | |
1466 | using the structure return conventions on the machine in question; | |
1467 | 0 when it is using the value returning conventions (this often | |
1468 | means returning pointer to where structure is vs. returning value). */ | |
1469 | ||
1669605f | 1470 | /* ARGSUSED */ |
c906108c | 1471 | value_ptr |
1669605f | 1472 | value_being_returned (struct type *valtype, char *retbuf, int struct_return) |
c906108c SS |
1473 | { |
1474 | register value_ptr val; | |
1475 | CORE_ADDR addr; | |
1476 | ||
c906108c | 1477 | /* If this is not defined, just use EXTRACT_RETURN_VALUE instead. */ |
ac9a91a7 JM |
1478 | if (EXTRACT_STRUCT_VALUE_ADDRESS_P) |
1479 | if (struct_return) | |
1480 | { | |
1481 | addr = EXTRACT_STRUCT_VALUE_ADDRESS (retbuf); | |
1482 | if (!addr) | |
1483 | error ("Function return value unknown"); | |
1484 | return value_at (valtype, addr, NULL); | |
1485 | } | |
c906108c SS |
1486 | |
1487 | val = allocate_value (valtype); | |
1488 | CHECK_TYPEDEF (valtype); | |
1489 | EXTRACT_RETURN_VALUE (valtype, retbuf, VALUE_CONTENTS_RAW (val)); | |
1490 | ||
1491 | return val; | |
1492 | } | |
1493 | ||
1494 | /* Should we use EXTRACT_STRUCT_VALUE_ADDRESS instead of | |
1495 | EXTRACT_RETURN_VALUE? GCC_P is true if compiled with gcc | |
1496 | and TYPE is the type (which is known to be struct, union or array). | |
1497 | ||
1498 | On most machines, the struct convention is used unless we are | |
1499 | using gcc and the type is of a special size. */ | |
1500 | /* As of about 31 Mar 93, GCC was changed to be compatible with the | |
1501 | native compiler. GCC 2.3.3 was the last release that did it the | |
1502 | old way. Since gcc2_compiled was not changed, we have no | |
1503 | way to correctly win in all cases, so we just do the right thing | |
1504 | for gcc1 and for gcc2 after this change. Thus it loses for gcc | |
1505 | 2.0-2.3.3. This is somewhat unfortunate, but changing gcc2_compiled | |
1506 | would cause more chaos than dealing with some struct returns being | |
1507 | handled wrong. */ | |
1508 | ||
1509 | int | |
fba45db2 | 1510 | generic_use_struct_convention (int gcc_p, struct type *value_type) |
c5aa993b | 1511 | { |
c906108c | 1512 | return !((gcc_p == 1) |
c5aa993b JM |
1513 | && (TYPE_LENGTH (value_type) == 1 |
1514 | || TYPE_LENGTH (value_type) == 2 | |
1515 | || TYPE_LENGTH (value_type) == 4 | |
1516 | || TYPE_LENGTH (value_type) == 8)); | |
c906108c SS |
1517 | } |
1518 | ||
1519 | #ifndef USE_STRUCT_CONVENTION | |
1520 | #define USE_STRUCT_CONVENTION(gcc_p,type) generic_use_struct_convention (gcc_p, type) | |
1521 | #endif | |
1522 | ||
c906108c SS |
1523 | |
1524 | /* Return true if the function specified is using the structure returning | |
1525 | convention on this machine to return arguments, or 0 if it is using | |
1526 | the value returning convention. FUNCTION is the value representing | |
1527 | the function, FUNCADDR is the address of the function, and VALUE_TYPE | |
1528 | is the type returned by the function. GCC_P is nonzero if compiled | |
1529 | with GCC. */ | |
1530 | ||
1669605f | 1531 | /* ARGSUSED */ |
c906108c | 1532 | int |
1669605f KB |
1533 | using_struct_return (value_ptr function, CORE_ADDR funcaddr, |
1534 | struct type *value_type, int gcc_p) | |
c906108c SS |
1535 | { |
1536 | register enum type_code code = TYPE_CODE (value_type); | |
1537 | ||
1538 | if (code == TYPE_CODE_ERROR) | |
1539 | error ("Function return type unknown."); | |
1540 | ||
1541 | if (code == TYPE_CODE_STRUCT | |
1542 | || code == TYPE_CODE_UNION | |
1543 | || code == TYPE_CODE_ARRAY | |
1544 | || RETURN_VALUE_ON_STACK (value_type)) | |
1545 | return USE_STRUCT_CONVENTION (gcc_p, value_type); | |
1546 | ||
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | /* Store VAL so it will be returned if a function returns now. | |
1551 | Does not verify that VAL's type matches what the current | |
1552 | function wants to return. */ | |
1553 | ||
1554 | void | |
fba45db2 | 1555 | set_return_value (value_ptr val) |
c906108c SS |
1556 | { |
1557 | struct type *type = check_typedef (VALUE_TYPE (val)); | |
1558 | register enum type_code code = TYPE_CODE (type); | |
1559 | ||
1560 | if (code == TYPE_CODE_ERROR) | |
1561 | error ("Function return type unknown."); | |
1562 | ||
c5aa993b | 1563 | if (code == TYPE_CODE_STRUCT |
c906108c SS |
1564 | || code == TYPE_CODE_UNION) /* FIXME, implement struct return. */ |
1565 | error ("GDB does not support specifying a struct or union return value."); | |
1566 | ||
1567 | STORE_RETURN_VALUE (type, VALUE_CONTENTS (val)); | |
1568 | } | |
1569 | \f | |
1570 | void | |
fba45db2 | 1571 | _initialize_values (void) |
c906108c SS |
1572 | { |
1573 | add_cmd ("convenience", no_class, show_convenience, | |
c5aa993b | 1574 | "Debugger convenience (\"$foo\") variables.\n\ |
c906108c SS |
1575 | These variables are created when you assign them values;\n\ |
1576 | thus, \"print $foo=1\" gives \"$foo\" the value 1. Values may be any type.\n\n\ | |
1577 | A few convenience variables are given values automatically:\n\ | |
1578 | \"$_\"holds the last address examined with \"x\" or \"info lines\",\n\ | |
1579 | \"$__\" holds the contents of the last address examined with \"x\".", | |
1580 | &showlist); | |
1581 | ||
1582 | add_cmd ("values", no_class, show_values, | |
1583 | "Elements of value history around item number IDX (or last ten).", | |
1584 | &showlist); | |
1585 | } |