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7d9884b9 JG |
1 | /* Low level packing and unpacking of values for GDB, the GNU Debugger. |
2 | Copyright 1986, 1987, 1989, 1991 Free Software Foundation, Inc. | |
dd3b648e RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
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 | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e RP |
19 | |
20 | #include <stdio.h> | |
21 | #include <string.h> | |
22 | #include "defs.h" | |
dd3b648e RP |
23 | #include "symtab.h" |
24 | #include "value.h" | |
25 | #include "gdbcore.h" | |
26 | #include "frame.h" | |
27 | #include "command.h" | |
f266e564 | 28 | #include "gdbcmd.h" |
dd3b648e | 29 | |
71b16efa | 30 | extern char *cplus_demangle (); |
71b16efa | 31 | |
dd3b648e RP |
32 | /* The value-history records all the values printed |
33 | by print commands during this session. Each chunk | |
34 | records 60 consecutive values. The first chunk on | |
35 | the chain records the most recent values. | |
36 | The total number of values is in value_history_count. */ | |
37 | ||
38 | #define VALUE_HISTORY_CHUNK 60 | |
39 | ||
40 | struct value_history_chunk | |
41 | { | |
42 | struct value_history_chunk *next; | |
43 | value values[VALUE_HISTORY_CHUNK]; | |
44 | }; | |
45 | ||
46 | /* Chain of chunks now in use. */ | |
47 | ||
48 | static struct value_history_chunk *value_history_chain; | |
49 | ||
50 | static int value_history_count; /* Abs number of last entry stored */ | |
dd3b648e RP |
51 | \f |
52 | /* List of all value objects currently allocated | |
53 | (except for those released by calls to release_value) | |
54 | This is so they can be freed after each command. */ | |
55 | ||
56 | static value all_values; | |
57 | ||
58 | /* Allocate a value that has the correct length for type TYPE. */ | |
59 | ||
60 | value | |
61 | allocate_value (type) | |
62 | struct type *type; | |
63 | { | |
64 | register value val; | |
65 | ||
66 | check_stub_type (type); | |
67 | ||
68 | val = (value) xmalloc (sizeof (struct value) + TYPE_LENGTH (type)); | |
69 | VALUE_NEXT (val) = all_values; | |
70 | all_values = val; | |
71 | VALUE_TYPE (val) = type; | |
72 | VALUE_LVAL (val) = not_lval; | |
73 | VALUE_ADDRESS (val) = 0; | |
74 | VALUE_FRAME (val) = 0; | |
75 | VALUE_OFFSET (val) = 0; | |
76 | VALUE_BITPOS (val) = 0; | |
77 | VALUE_BITSIZE (val) = 0; | |
78 | VALUE_REPEATED (val) = 0; | |
79 | VALUE_REPETITIONS (val) = 0; | |
80 | VALUE_REGNO (val) = -1; | |
81 | VALUE_LAZY (val) = 0; | |
82 | VALUE_OPTIMIZED_OUT (val) = 0; | |
83 | return val; | |
84 | } | |
85 | ||
86 | /* Allocate a value that has the correct length | |
87 | for COUNT repetitions type TYPE. */ | |
88 | ||
89 | value | |
90 | allocate_repeat_value (type, count) | |
91 | struct type *type; | |
92 | int count; | |
93 | { | |
94 | register value val; | |
95 | ||
96 | val = (value) xmalloc (sizeof (struct value) + TYPE_LENGTH (type) * count); | |
97 | VALUE_NEXT (val) = all_values; | |
98 | all_values = val; | |
99 | VALUE_TYPE (val) = type; | |
100 | VALUE_LVAL (val) = not_lval; | |
101 | VALUE_ADDRESS (val) = 0; | |
102 | VALUE_FRAME (val) = 0; | |
103 | VALUE_OFFSET (val) = 0; | |
104 | VALUE_BITPOS (val) = 0; | |
105 | VALUE_BITSIZE (val) = 0; | |
106 | VALUE_REPEATED (val) = 1; | |
107 | VALUE_REPETITIONS (val) = count; | |
108 | VALUE_REGNO (val) = -1; | |
109 | VALUE_LAZY (val) = 0; | |
110 | VALUE_OPTIMIZED_OUT (val) = 0; | |
111 | return val; | |
112 | } | |
113 | ||
fcb887ff JK |
114 | /* Return a mark in the value chain. All values allocated after the |
115 | mark is obtained (except for those released) are subject to being freed | |
116 | if a subsequent value_free_to_mark is passed the mark. */ | |
117 | value | |
118 | value_mark () | |
119 | { | |
120 | return all_values; | |
121 | } | |
122 | ||
123 | /* Free all values allocated since MARK was obtained by value_mark | |
124 | (except for those released). */ | |
125 | void | |
126 | value_free_to_mark (mark) | |
127 | value mark; | |
128 | { | |
129 | value val, next; | |
130 | ||
131 | for (val = all_values; val && val != mark; val = next) | |
132 | { | |
133 | next = VALUE_NEXT (val); | |
134 | value_free (val); | |
135 | } | |
136 | all_values = val; | |
137 | } | |
138 | ||
dd3b648e RP |
139 | /* Free all the values that have been allocated (except for those released). |
140 | Called after each command, successful or not. */ | |
141 | ||
142 | void | |
143 | free_all_values () | |
144 | { | |
145 | register value val, next; | |
146 | ||
147 | for (val = all_values; val; val = next) | |
148 | { | |
149 | next = VALUE_NEXT (val); | |
150 | value_free (val); | |
151 | } | |
152 | ||
153 | all_values = 0; | |
154 | } | |
155 | ||
156 | /* Remove VAL from the chain all_values | |
157 | so it will not be freed automatically. */ | |
158 | ||
159 | void | |
160 | release_value (val) | |
161 | register value val; | |
162 | { | |
163 | register value v; | |
164 | ||
165 | if (all_values == val) | |
166 | { | |
167 | all_values = val->next; | |
168 | return; | |
169 | } | |
170 | ||
171 | for (v = all_values; v; v = v->next) | |
172 | { | |
173 | if (v->next == val) | |
174 | { | |
175 | v->next = val->next; | |
176 | break; | |
177 | } | |
178 | } | |
179 | } | |
180 | ||
181 | /* Return a copy of the value ARG. | |
182 | It contains the same contents, for same memory address, | |
183 | but it's a different block of storage. */ | |
184 | ||
185 | static value | |
186 | value_copy (arg) | |
187 | value arg; | |
188 | { | |
189 | register value val; | |
190 | register struct type *type = VALUE_TYPE (arg); | |
191 | if (VALUE_REPEATED (arg)) | |
192 | val = allocate_repeat_value (type, VALUE_REPETITIONS (arg)); | |
193 | else | |
194 | val = allocate_value (type); | |
195 | VALUE_LVAL (val) = VALUE_LVAL (arg); | |
196 | VALUE_ADDRESS (val) = VALUE_ADDRESS (arg); | |
197 | VALUE_OFFSET (val) = VALUE_OFFSET (arg); | |
198 | VALUE_BITPOS (val) = VALUE_BITPOS (arg); | |
199 | VALUE_BITSIZE (val) = VALUE_BITSIZE (arg); | |
200 | VALUE_REGNO (val) = VALUE_REGNO (arg); | |
201 | VALUE_LAZY (val) = VALUE_LAZY (arg); | |
202 | if (!VALUE_LAZY (val)) | |
203 | { | |
204 | bcopy (VALUE_CONTENTS_RAW (arg), VALUE_CONTENTS_RAW (val), | |
205 | TYPE_LENGTH (VALUE_TYPE (arg)) | |
206 | * (VALUE_REPEATED (arg) ? VALUE_REPETITIONS (arg) : 1)); | |
207 | } | |
208 | return val; | |
209 | } | |
210 | \f | |
211 | /* Access to the value history. */ | |
212 | ||
213 | /* Record a new value in the value history. | |
214 | Returns the absolute history index of the entry. | |
215 | Result of -1 indicates the value was not saved; otherwise it is the | |
216 | value history index of this new item. */ | |
217 | ||
218 | int | |
219 | record_latest_value (val) | |
220 | value val; | |
221 | { | |
222 | int i; | |
223 | ||
224 | /* Check error now if about to store an invalid float. We return -1 | |
225 | to the caller, but allow them to continue, e.g. to print it as "Nan". */ | |
226 | if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FLT) { | |
227 | (void) unpack_double (VALUE_TYPE (val), VALUE_CONTENTS (val), &i); | |
228 | if (i) return -1; /* Indicate value not saved in history */ | |
229 | } | |
230 | ||
231 | /* Here we treat value_history_count as origin-zero | |
232 | and applying to the value being stored now. */ | |
233 | ||
234 | i = value_history_count % VALUE_HISTORY_CHUNK; | |
235 | if (i == 0) | |
236 | { | |
237 | register struct value_history_chunk *new | |
238 | = (struct value_history_chunk *) | |
239 | xmalloc (sizeof (struct value_history_chunk)); | |
240 | bzero (new->values, sizeof new->values); | |
241 | new->next = value_history_chain; | |
242 | value_history_chain = new; | |
243 | } | |
244 | ||
245 | value_history_chain->values[i] = val; | |
246 | release_value (val); | |
247 | ||
248 | /* Now we regard value_history_count as origin-one | |
249 | and applying to the value just stored. */ | |
250 | ||
251 | return ++value_history_count; | |
252 | } | |
253 | ||
254 | /* Return a copy of the value in the history with sequence number NUM. */ | |
255 | ||
256 | value | |
257 | access_value_history (num) | |
258 | int num; | |
259 | { | |
260 | register struct value_history_chunk *chunk; | |
261 | register int i; | |
262 | register int absnum = num; | |
263 | ||
264 | if (absnum <= 0) | |
265 | absnum += value_history_count; | |
266 | ||
267 | if (absnum <= 0) | |
268 | { | |
269 | if (num == 0) | |
270 | error ("The history is empty."); | |
271 | else if (num == 1) | |
272 | error ("There is only one value in the history."); | |
273 | else | |
274 | error ("History does not go back to $$%d.", -num); | |
275 | } | |
276 | if (absnum > value_history_count) | |
277 | error ("History has not yet reached $%d.", absnum); | |
278 | ||
279 | absnum--; | |
280 | ||
281 | /* Now absnum is always absolute and origin zero. */ | |
282 | ||
283 | chunk = value_history_chain; | |
284 | for (i = (value_history_count - 1) / VALUE_HISTORY_CHUNK - absnum / VALUE_HISTORY_CHUNK; | |
285 | i > 0; i--) | |
286 | chunk = chunk->next; | |
287 | ||
288 | return value_copy (chunk->values[absnum % VALUE_HISTORY_CHUNK]); | |
289 | } | |
290 | ||
291 | /* Clear the value history entirely. | |
292 | Must be done when new symbol tables are loaded, | |
293 | because the type pointers become invalid. */ | |
294 | ||
295 | void | |
296 | clear_value_history () | |
297 | { | |
298 | register struct value_history_chunk *next; | |
299 | register int i; | |
300 | register value val; | |
301 | ||
302 | while (value_history_chain) | |
303 | { | |
304 | for (i = 0; i < VALUE_HISTORY_CHUNK; i++) | |
305 | if (val = value_history_chain->values[i]) | |
306 | free (val); | |
307 | next = value_history_chain->next; | |
308 | free (value_history_chain); | |
309 | value_history_chain = next; | |
310 | } | |
311 | value_history_count = 0; | |
312 | } | |
313 | ||
314 | static void | |
f266e564 | 315 | show_values (num_exp, from_tty) |
dd3b648e RP |
316 | char *num_exp; |
317 | int from_tty; | |
318 | { | |
319 | register int i; | |
320 | register value val; | |
321 | static int num = 1; | |
322 | ||
323 | if (num_exp) | |
324 | { | |
325 | if (num_exp[0] == '+' && num_exp[1] == '\0') | |
326 | /* "info history +" should print from the stored position. */ | |
327 | ; | |
328 | else | |
329 | /* "info history <exp>" should print around value number <exp>. */ | |
330 | num = parse_and_eval_address (num_exp) - 5; | |
331 | } | |
332 | else | |
333 | { | |
334 | /* "info history" means print the last 10 values. */ | |
335 | num = value_history_count - 9; | |
336 | } | |
337 | ||
338 | if (num <= 0) | |
339 | num = 1; | |
340 | ||
341 | for (i = num; i < num + 10 && i <= value_history_count; i++) | |
342 | { | |
343 | val = access_value_history (i); | |
344 | printf_filtered ("$%d = ", i); | |
345 | value_print (val, stdout, 0, Val_pretty_default); | |
346 | printf_filtered ("\n"); | |
347 | } | |
348 | ||
349 | /* The next "info history +" should start after what we just printed. */ | |
350 | num += 10; | |
351 | ||
352 | /* Hitting just return after this command should do the same thing as | |
353 | "info history +". If num_exp is null, this is unnecessary, since | |
354 | "info history +" is not useful after "info history". */ | |
355 | if (from_tty && num_exp) | |
356 | { | |
357 | num_exp[0] = '+'; | |
358 | num_exp[1] = '\0'; | |
359 | } | |
360 | } | |
361 | \f | |
362 | /* Internal variables. These are variables within the debugger | |
363 | that hold values assigned by debugger commands. | |
364 | The user refers to them with a '$' prefix | |
365 | that does not appear in the variable names stored internally. */ | |
366 | ||
367 | static struct internalvar *internalvars; | |
368 | ||
369 | /* Look up an internal variable with name NAME. NAME should not | |
370 | normally include a dollar sign. | |
371 | ||
372 | If the specified internal variable does not exist, | |
373 | one is created, with a void value. */ | |
374 | ||
375 | struct internalvar * | |
376 | lookup_internalvar (name) | |
377 | char *name; | |
378 | { | |
379 | register struct internalvar *var; | |
380 | ||
381 | for (var = internalvars; var; var = var->next) | |
382 | if (!strcmp (var->name, name)) | |
383 | return var; | |
384 | ||
385 | var = (struct internalvar *) xmalloc (sizeof (struct internalvar)); | |
58ae87f6 | 386 | var->name = concat (name, NULL); |
dd3b648e RP |
387 | var->value = allocate_value (builtin_type_void); |
388 | release_value (var->value); | |
389 | var->next = internalvars; | |
390 | internalvars = var; | |
391 | return var; | |
392 | } | |
393 | ||
394 | value | |
395 | value_of_internalvar (var) | |
396 | struct internalvar *var; | |
397 | { | |
398 | register value val; | |
399 | ||
400 | #ifdef IS_TRAPPED_INTERNALVAR | |
401 | if (IS_TRAPPED_INTERNALVAR (var->name)) | |
402 | return VALUE_OF_TRAPPED_INTERNALVAR (var); | |
403 | #endif | |
404 | ||
405 | val = value_copy (var->value); | |
406 | if (VALUE_LAZY (val)) | |
407 | value_fetch_lazy (val); | |
408 | VALUE_LVAL (val) = lval_internalvar; | |
409 | VALUE_INTERNALVAR (val) = var; | |
410 | return val; | |
411 | } | |
412 | ||
413 | void | |
414 | set_internalvar_component (var, offset, bitpos, bitsize, newval) | |
415 | struct internalvar *var; | |
416 | int offset, bitpos, bitsize; | |
417 | value newval; | |
418 | { | |
419 | register char *addr = VALUE_CONTENTS (var->value) + offset; | |
420 | ||
421 | #ifdef IS_TRAPPED_INTERNALVAR | |
422 | if (IS_TRAPPED_INTERNALVAR (var->name)) | |
423 | SET_TRAPPED_INTERNALVAR (var, newval, bitpos, bitsize, offset); | |
424 | #endif | |
425 | ||
426 | if (bitsize) | |
427 | modify_field (addr, (int) value_as_long (newval), | |
428 | bitpos, bitsize); | |
429 | else | |
430 | bcopy (VALUE_CONTENTS (newval), addr, | |
431 | TYPE_LENGTH (VALUE_TYPE (newval))); | |
432 | } | |
433 | ||
434 | void | |
435 | set_internalvar (var, val) | |
436 | struct internalvar *var; | |
437 | value val; | |
438 | { | |
439 | #ifdef IS_TRAPPED_INTERNALVAR | |
440 | if (IS_TRAPPED_INTERNALVAR (var->name)) | |
441 | SET_TRAPPED_INTERNALVAR (var, val, 0, 0, 0); | |
442 | #endif | |
443 | ||
444 | free (var->value); | |
445 | var->value = value_copy (val); | |
446 | release_value (var->value); | |
447 | } | |
448 | ||
449 | char * | |
450 | internalvar_name (var) | |
451 | struct internalvar *var; | |
452 | { | |
453 | return var->name; | |
454 | } | |
455 | ||
456 | /* Free all internalvars. Done when new symtabs are loaded, | |
457 | because that makes the values invalid. */ | |
458 | ||
459 | void | |
460 | clear_internalvars () | |
461 | { | |
462 | register struct internalvar *var; | |
463 | ||
464 | while (internalvars) | |
465 | { | |
466 | var = internalvars; | |
467 | internalvars = var->next; | |
468 | free (var->name); | |
469 | free (var->value); | |
470 | free (var); | |
471 | } | |
472 | } | |
473 | ||
474 | static void | |
f266e564 | 475 | show_convenience () |
dd3b648e RP |
476 | { |
477 | register struct internalvar *var; | |
478 | int varseen = 0; | |
479 | ||
480 | for (var = internalvars; var; var = var->next) | |
481 | { | |
482 | #ifdef IS_TRAPPED_INTERNALVAR | |
483 | if (IS_TRAPPED_INTERNALVAR (var->name)) | |
484 | continue; | |
485 | #endif | |
486 | if (!varseen) | |
487 | { | |
488 | #if 0 | |
489 | /* Useless noise. */ | |
490 | printf ("Debugger convenience variables:\n\n"); | |
491 | #endif | |
492 | varseen = 1; | |
493 | } | |
afe4ca15 | 494 | printf_filtered ("$%s = ", var->name); |
dd3b648e | 495 | value_print (var->value, stdout, 0, Val_pretty_default); |
afe4ca15 | 496 | printf_filtered ("\n"); |
dd3b648e RP |
497 | } |
498 | if (!varseen) | |
499 | printf ("No debugger convenience variables now defined.\n\ | |
500 | Convenience variables have names starting with \"$\";\n\ | |
501 | use \"set\" as in \"set $foo = 5\" to define them.\n"); | |
502 | } | |
503 | \f | |
504 | /* Extract a value as a C number (either long or double). | |
505 | Knows how to convert fixed values to double, or | |
506 | floating values to long. | |
507 | Does not deallocate the value. */ | |
508 | ||
509 | LONGEST | |
510 | value_as_long (val) | |
511 | register value val; | |
512 | { | |
513 | /* This coerces arrays and functions, which is necessary (e.g. | |
514 | in disassemble_command). It also dereferences references, which | |
515 | I suspect is the most logical thing to do. */ | |
516 | if (TYPE_CODE (VALUE_TYPE (val)) != TYPE_CODE_ENUM) | |
517 | COERCE_ARRAY (val); | |
518 | return unpack_long (VALUE_TYPE (val), VALUE_CONTENTS (val)); | |
519 | } | |
520 | ||
521 | double | |
522 | value_as_double (val) | |
523 | register value val; | |
524 | { | |
525 | double foo; | |
526 | int inv; | |
527 | ||
528 | foo = unpack_double (VALUE_TYPE (val), VALUE_CONTENTS (val), &inv); | |
529 | if (inv) | |
530 | error ("Invalid floating value found in program."); | |
531 | return foo; | |
532 | } | |
e1ce8aa5 JK |
533 | /* Extract a value as a C pointer. |
534 | Does not deallocate the value. */ | |
535 | CORE_ADDR | |
536 | value_as_pointer (val) | |
537 | value val; | |
538 | { | |
2bff8e38 JK |
539 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure |
540 | whether we want this to be true eventually. */ | |
541 | return value_as_long (val); | |
e1ce8aa5 | 542 | } |
dd3b648e RP |
543 | \f |
544 | /* Unpack raw data (copied from debugee, target byte order) at VALADDR | |
545 | as a long, or as a double, assuming the raw data is described | |
546 | by type TYPE. Knows how to convert different sizes of values | |
547 | and can convert between fixed and floating point. We don't assume | |
548 | any alignment for the raw data. Return value is in host byte order. | |
549 | ||
550 | If you want functions and arrays to be coerced to pointers, and | |
551 | references to be dereferenced, call value_as_long() instead. | |
552 | ||
553 | C++: It is assumed that the front-end has taken care of | |
554 | all matters concerning pointers to members. A pointer | |
555 | to member which reaches here is considered to be equivalent | |
556 | to an INT (or some size). After all, it is only an offset. */ | |
557 | ||
35505d07 JG |
558 | /* FIXME: This should be rewritten as a switch statement for speed and |
559 | ease of comprehension. */ | |
560 | ||
dd3b648e RP |
561 | LONGEST |
562 | unpack_long (type, valaddr) | |
563 | struct type *type; | |
564 | char *valaddr; | |
565 | { | |
566 | register enum type_code code = TYPE_CODE (type); | |
567 | register int len = TYPE_LENGTH (type); | |
568 | register int nosign = TYPE_UNSIGNED (type); | |
569 | ||
35505d07 | 570 | if (code == TYPE_CODE_ENUM || code == TYPE_CODE_BOOL) |
dd3b648e RP |
571 | code = TYPE_CODE_INT; |
572 | if (code == TYPE_CODE_FLT) | |
573 | { | |
574 | if (len == sizeof (float)) | |
575 | { | |
576 | float retval; | |
577 | bcopy (valaddr, &retval, sizeof (retval)); | |
578 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
579 | return retval; | |
580 | } | |
581 | ||
582 | if (len == sizeof (double)) | |
583 | { | |
584 | double retval; | |
585 | bcopy (valaddr, &retval, sizeof (retval)); | |
586 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
587 | return retval; | |
588 | } | |
589 | else | |
590 | { | |
591 | error ("Unexpected type of floating point number."); | |
592 | } | |
593 | } | |
594 | else if (code == TYPE_CODE_INT && nosign) | |
595 | { | |
596 | if (len == sizeof (char)) | |
597 | { | |
598 | unsigned char retval = * (unsigned char *) valaddr; | |
599 | /* SWAP_TARGET_AND_HOST (&retval, sizeof (unsigned char)); */ | |
600 | return retval; | |
601 | } | |
602 | ||
603 | if (len == sizeof (short)) | |
604 | { | |
605 | unsigned short retval; | |
606 | bcopy (valaddr, &retval, sizeof (retval)); | |
607 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
608 | return retval; | |
609 | } | |
610 | ||
611 | if (len == sizeof (int)) | |
612 | { | |
613 | unsigned int retval; | |
614 | bcopy (valaddr, &retval, sizeof (retval)); | |
615 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
616 | return retval; | |
617 | } | |
618 | ||
619 | if (len == sizeof (long)) | |
620 | { | |
621 | unsigned long retval; | |
622 | bcopy (valaddr, &retval, sizeof (retval)); | |
623 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
624 | return retval; | |
625 | } | |
626 | #ifdef LONG_LONG | |
627 | if (len == sizeof (long long)) | |
628 | { | |
629 | unsigned long long retval; | |
630 | bcopy (valaddr, &retval, sizeof (retval)); | |
631 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
632 | return retval; | |
633 | } | |
634 | #endif | |
635 | else | |
636 | { | |
637 | error ("That operation is not possible on an integer of that size."); | |
638 | } | |
639 | } | |
640 | else if (code == TYPE_CODE_INT) | |
641 | { | |
642 | if (len == sizeof (char)) | |
643 | { | |
644 | char retval; | |
645 | bcopy (valaddr, &retval, sizeof (retval)); | |
646 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
647 | return retval; | |
648 | } | |
649 | ||
650 | if (len == sizeof (short)) | |
651 | { | |
652 | short retval; | |
653 | bcopy (valaddr, &retval, sizeof (retval)); | |
654 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
655 | return retval; | |
656 | } | |
657 | ||
658 | if (len == sizeof (int)) | |
659 | { | |
660 | int retval; | |
661 | bcopy (valaddr, &retval, sizeof (retval)); | |
662 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
663 | return retval; | |
664 | } | |
665 | ||
666 | if (len == sizeof (long)) | |
667 | { | |
668 | long retval; | |
669 | bcopy (valaddr, &retval, sizeof (retval)); | |
670 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
671 | return retval; | |
672 | } | |
673 | ||
674 | #ifdef LONG_LONG | |
675 | if (len == sizeof (long long)) | |
676 | { | |
677 | long long retval; | |
678 | bcopy (valaddr, &retval, sizeof (retval)); | |
679 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
680 | return retval; | |
681 | } | |
682 | #endif | |
683 | else | |
684 | { | |
685 | error ("That operation is not possible on an integer of that size."); | |
686 | } | |
687 | } | |
2bff8e38 JK |
688 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure |
689 | whether we want this to be true eventually. */ | |
dd3b648e RP |
690 | else if (code == TYPE_CODE_PTR |
691 | || code == TYPE_CODE_REF) | |
692 | { | |
e1ce8aa5 | 693 | if (len == sizeof (CORE_ADDR)) |
dd3b648e RP |
694 | { |
695 | CORE_ADDR retval; | |
696 | bcopy (valaddr, &retval, sizeof (retval)); | |
697 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
698 | return retval; | |
699 | } | |
700 | } | |
701 | else if (code == TYPE_CODE_MEMBER) | |
702 | error ("not implemented: member types in unpack_long"); | |
35505d07 JG |
703 | else if (code == TYPE_CODE_CHAR) |
704 | return *(unsigned char *)valaddr; | |
dd3b648e RP |
705 | |
706 | error ("Value not integer or pointer."); | |
707 | return 0; /* For lint -- never reached */ | |
708 | } | |
709 | ||
710 | /* Return a double value from the specified type and address. | |
711 | INVP points to an int which is set to 0 for valid value, | |
712 | 1 for invalid value (bad float format). In either case, | |
713 | the returned double is OK to use. Argument is in target | |
714 | format, result is in host format. */ | |
715 | ||
716 | double | |
717 | unpack_double (type, valaddr, invp) | |
718 | struct type *type; | |
719 | char *valaddr; | |
720 | int *invp; | |
721 | { | |
722 | register enum type_code code = TYPE_CODE (type); | |
723 | register int len = TYPE_LENGTH (type); | |
724 | register int nosign = TYPE_UNSIGNED (type); | |
725 | ||
726 | *invp = 0; /* Assume valid. */ | |
727 | if (code == TYPE_CODE_FLT) | |
728 | { | |
729 | if (INVALID_FLOAT (valaddr, len)) | |
730 | { | |
731 | *invp = 1; | |
732 | return 1.234567891011121314; | |
733 | } | |
734 | ||
735 | if (len == sizeof (float)) | |
736 | { | |
737 | float retval; | |
738 | bcopy (valaddr, &retval, sizeof (retval)); | |
739 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
740 | return retval; | |
741 | } | |
742 | ||
743 | if (len == sizeof (double)) | |
744 | { | |
745 | double retval; | |
746 | bcopy (valaddr, &retval, sizeof (retval)); | |
747 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
748 | return retval; | |
749 | } | |
750 | else | |
751 | { | |
752 | error ("Unexpected type of floating point number."); | |
e1ce8aa5 | 753 | return 0; /* Placate lint. */ |
dd3b648e RP |
754 | } |
755 | } | |
756 | else if (nosign) { | |
757 | /* Unsigned -- be sure we compensate for signed LONGEST. */ | |
758 | #ifdef LONG_LONG | |
759 | return (unsigned long long) unpack_long (type, valaddr); | |
760 | #else | |
761 | return (unsigned long ) unpack_long (type, valaddr); | |
762 | #endif | |
763 | } else { | |
764 | /* Signed -- we are OK with unpack_long. */ | |
765 | return unpack_long (type, valaddr); | |
766 | } | |
767 | } | |
e1ce8aa5 JK |
768 | |
769 | /* Unpack raw data (copied from debugee, target byte order) at VALADDR | |
770 | as a CORE_ADDR, assuming the raw data is described by type TYPE. | |
771 | We don't assume any alignment for the raw data. Return value is in | |
772 | host byte order. | |
773 | ||
774 | If you want functions and arrays to be coerced to pointers, and | |
775 | references to be dereferenced, call value_as_pointer() instead. | |
776 | ||
777 | C++: It is assumed that the front-end has taken care of | |
778 | all matters concerning pointers to members. A pointer | |
779 | to member which reaches here is considered to be equivalent | |
780 | to an INT (or some size). After all, it is only an offset. */ | |
781 | ||
782 | CORE_ADDR | |
783 | unpack_pointer (type, valaddr) | |
784 | struct type *type; | |
785 | char *valaddr; | |
786 | { | |
2bff8e38 JK |
787 | #if 0 |
788 | /* The user should be able to use an int (e.g. 0x7892) in contexts | |
789 | where a pointer is expected. So this doesn't do enough. */ | |
e1ce8aa5 JK |
790 | register enum type_code code = TYPE_CODE (type); |
791 | register int len = TYPE_LENGTH (type); | |
792 | ||
793 | if (code == TYPE_CODE_PTR | |
794 | || code == TYPE_CODE_REF) | |
795 | { | |
796 | if (len == sizeof (CORE_ADDR)) | |
797 | { | |
798 | CORE_ADDR retval; | |
799 | bcopy (valaddr, &retval, sizeof (retval)); | |
800 | SWAP_TARGET_AND_HOST (&retval, sizeof (retval)); | |
801 | return retval; | |
802 | } | |
803 | error ("Unrecognized pointer size."); | |
804 | } | |
805 | else if (code == TYPE_CODE_MEMBER) | |
806 | error ("not implemented: member types in unpack_pointer"); | |
807 | ||
808 | error ("Value is not a pointer."); | |
809 | return 0; /* For lint -- never reached */ | |
2bff8e38 JK |
810 | #else |
811 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
812 | whether we want this to be true eventually. */ | |
813 | return unpack_long (type, valaddr); | |
814 | #endif | |
e1ce8aa5 | 815 | } |
dd3b648e RP |
816 | \f |
817 | /* Given a value ARG1 (offset by OFFSET bytes) | |
818 | of a struct or union type ARG_TYPE, | |
819 | extract and return the value of one of its fields. | |
820 | FIELDNO says which field. | |
821 | ||
822 | For C++, must also be able to return values from static fields */ | |
823 | ||
824 | value | |
825 | value_primitive_field (arg1, offset, fieldno, arg_type) | |
826 | register value arg1; | |
827 | int offset; | |
828 | register int fieldno; | |
829 | register struct type *arg_type; | |
830 | { | |
831 | register value v; | |
832 | register struct type *type; | |
833 | ||
834 | check_stub_type (arg_type); | |
835 | type = TYPE_FIELD_TYPE (arg_type, fieldno); | |
836 | ||
837 | /* Handle packed fields */ | |
838 | ||
839 | offset += TYPE_FIELD_BITPOS (arg_type, fieldno) / 8; | |
840 | if (TYPE_FIELD_BITSIZE (arg_type, fieldno)) | |
841 | { | |
96b2f51c | 842 | v = value_from_longest (type, |
dd3b648e RP |
843 | unpack_field_as_long (arg_type, |
844 | VALUE_CONTENTS (arg1), | |
845 | fieldno)); | |
846 | VALUE_BITPOS (v) = TYPE_FIELD_BITPOS (arg_type, fieldno) % 8; | |
847 | VALUE_BITSIZE (v) = TYPE_FIELD_BITSIZE (arg_type, fieldno); | |
848 | } | |
849 | else | |
850 | { | |
851 | v = allocate_value (type); | |
852 | if (VALUE_LAZY (arg1)) | |
853 | VALUE_LAZY (v) = 1; | |
854 | else | |
855 | bcopy (VALUE_CONTENTS_RAW (arg1) + offset, | |
856 | VALUE_CONTENTS_RAW (v), | |
857 | TYPE_LENGTH (type)); | |
858 | } | |
859 | VALUE_LVAL (v) = VALUE_LVAL (arg1); | |
860 | if (VALUE_LVAL (arg1) == lval_internalvar) | |
861 | VALUE_LVAL (v) = lval_internalvar_component; | |
862 | VALUE_ADDRESS (v) = VALUE_ADDRESS (arg1); | |
863 | VALUE_OFFSET (v) = offset + VALUE_OFFSET (arg1); | |
864 | return v; | |
865 | } | |
866 | ||
867 | /* Given a value ARG1 of a struct or union type, | |
868 | extract and return the value of one of its fields. | |
869 | FIELDNO says which field. | |
870 | ||
871 | For C++, must also be able to return values from static fields */ | |
872 | ||
873 | value | |
874 | value_field (arg1, fieldno) | |
875 | register value arg1; | |
876 | register int fieldno; | |
877 | { | |
878 | return value_primitive_field (arg1, 0, fieldno, VALUE_TYPE (arg1)); | |
879 | } | |
880 | ||
545af6ce PB |
881 | /* Return a non-virtual function as a value. |
882 | F is the list of member functions which contains the desired method. | |
883 | J is an index into F which provides the desired method. */ | |
884 | ||
dd3b648e | 885 | value |
545af6ce PB |
886 | value_fn_field (f, j) |
887 | struct fn_field *f; | |
888 | int j; | |
dd3b648e RP |
889 | { |
890 | register value v; | |
545af6ce | 891 | register struct type *type = TYPE_FN_FIELD_TYPE (f, j); |
dd3b648e RP |
892 | struct symbol *sym; |
893 | ||
545af6ce | 894 | sym = lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j), |
dd3b648e RP |
895 | 0, VAR_NAMESPACE, 0, NULL); |
896 | if (! sym) error ("Internal error: could not find physical method named %s", | |
545af6ce | 897 | TYPE_FN_FIELD_PHYSNAME (f, j)); |
dd3b648e RP |
898 | |
899 | v = allocate_value (type); | |
900 | VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); | |
901 | VALUE_TYPE (v) = type; | |
902 | return v; | |
903 | } | |
904 | ||
905 | /* Return a virtual function as a value. | |
906 | ARG1 is the object which provides the virtual function | |
907 | table pointer. ARG1 is side-effected in calling this function. | |
908 | F is the list of member functions which contains the desired virtual | |
909 | function. | |
e532974c JK |
910 | J is an index into F which provides the desired virtual function. |
911 | ||
912 | TYPE is the type in which F is located. */ | |
dd3b648e | 913 | value |
e532974c | 914 | value_virtual_fn_field (arg1, f, j, type) |
dd3b648e RP |
915 | value arg1; |
916 | struct fn_field *f; | |
917 | int j; | |
e532974c | 918 | struct type *type; |
dd3b648e RP |
919 | { |
920 | /* First, get the virtual function table pointer. That comes | |
921 | with a strange type, so cast it to type `pointer to long' (which | |
922 | should serve just fine as a function type). Then, index into | |
923 | the table, and convert final value to appropriate function type. */ | |
924 | value entry, vfn, vtbl; | |
96b2f51c | 925 | value vi = value_from_longest (builtin_type_int, |
dd3b648e | 926 | (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j)); |
e532974c JK |
927 | struct type *fcontext = TYPE_FN_FIELD_FCONTEXT (f, j); |
928 | struct type *context; | |
929 | if (fcontext == NULL) | |
930 | /* We don't have an fcontext (e.g. the program was compiled with | |
931 | g++ version 1). Try to get the vtbl from the TYPE_VPTR_BASETYPE. | |
932 | This won't work right for multiple inheritance, but at least we | |
933 | should do as well as GDB 3.x did. */ | |
934 | fcontext = TYPE_VPTR_BASETYPE (type); | |
935 | context = lookup_pointer_type (fcontext); | |
936 | /* Now context is a pointer to the basetype containing the vtbl. */ | |
dd3b648e RP |
937 | if (TYPE_TARGET_TYPE (context) != VALUE_TYPE (arg1)) |
938 | arg1 = value_ind (value_cast (context, value_addr (arg1))); | |
939 | ||
940 | context = VALUE_TYPE (arg1); | |
e532974c | 941 | /* Now context is the basetype containing the vtbl. */ |
dd3b648e RP |
942 | |
943 | /* This type may have been defined before its virtual function table | |
944 | was. If so, fill in the virtual function table entry for the | |
945 | type now. */ | |
946 | if (TYPE_VPTR_FIELDNO (context) < 0) | |
71b16efa | 947 | fill_in_vptr_fieldno (context); |
dd3b648e RP |
948 | |
949 | /* The virtual function table is now an array of structures | |
950 | which have the form { int16 offset, delta; void *pfn; }. */ | |
951 | vtbl = value_ind (value_field (arg1, TYPE_VPTR_FIELDNO (context))); | |
952 | ||
953 | /* Index into the virtual function table. This is hard-coded because | |
954 | looking up a field is not cheap, and it may be important to save | |
955 | time, e.g. if the user has set a conditional breakpoint calling | |
956 | a virtual function. */ | |
957 | entry = value_subscript (vtbl, vi); | |
958 | ||
959 | /* Move the `this' pointer according to the virtual function table. */ | |
960 | VALUE_OFFSET (arg1) += value_as_long (value_field (entry, 0)); | |
961 | if (! VALUE_LAZY (arg1)) | |
962 | { | |
963 | VALUE_LAZY (arg1) = 1; | |
964 | value_fetch_lazy (arg1); | |
965 | } | |
966 | ||
967 | vfn = value_field (entry, 2); | |
968 | /* Reinstantiate the function pointer with the correct type. */ | |
969 | VALUE_TYPE (vfn) = lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j)); | |
970 | ||
971 | return vfn; | |
972 | } | |
973 | ||
71b16efa JK |
974 | /* ARG is a pointer to an object we know to be at least |
975 | a DTYPE. BTYPE is the most derived basetype that has | |
976 | already been searched (and need not be searched again). | |
977 | After looking at the vtables between BTYPE and DTYPE, | |
978 | return the most derived type we find. The caller must | |
979 | be satisfied when the return value == DTYPE. | |
980 | ||
981 | FIXME-tiemann: should work with dossier entries as well. */ | |
982 | ||
983 | static value | |
984 | value_headof (arg, btype, dtype) | |
985 | value arg; | |
986 | struct type *btype, *dtype; | |
987 | { | |
988 | /* First collect the vtables we must look at for this object. */ | |
989 | /* FIXME-tiemann: right now, just look at top-most vtable. */ | |
990 | value vtbl, entry, best_entry = 0; | |
e1ce8aa5 | 991 | /* FIXME: entry_type is never used. */ |
71b16efa JK |
992 | struct type *entry_type; |
993 | int i, nelems; | |
994 | int offset, best_offset = 0; | |
995 | struct symbol *sym; | |
996 | CORE_ADDR pc_for_sym; | |
997 | char *demangled_name; | |
aec4cb91 MT |
998 | btype = TYPE_VPTR_BASETYPE (dtype); |
999 | check_stub_type (btype); | |
1000 | if (btype != dtype) | |
1001 | vtbl = value_cast (lookup_pointer_type (btype), arg); | |
1002 | else | |
1003 | vtbl = arg; | |
1004 | vtbl = value_ind (value_field (value_ind (vtbl), TYPE_VPTR_FIELDNO (btype))); | |
71b16efa JK |
1005 | |
1006 | /* Check that VTBL looks like it points to a virtual function table. */ | |
1007 | i = find_pc_misc_function (VALUE_ADDRESS (vtbl)); | |
bcccec8c | 1008 | if (i < 0 || ! VTBL_PREFIX_P (demangled_name = misc_function_vector[i].name)) |
71b16efa JK |
1009 | { |
1010 | /* If we expected to find a vtable, but did not, let the user | |
1011 | know that we aren't happy, but don't throw an error. | |
1012 | FIXME: there has to be a better way to do this. */ | |
1013 | struct type *error_type = (struct type *)xmalloc (sizeof (struct type)); | |
1014 | bcopy (VALUE_TYPE (arg), error_type, sizeof (struct type)); | |
1015 | TYPE_NAME (error_type) = savestring ("suspicious *", sizeof ("suspicious *")); | |
1016 | VALUE_TYPE (arg) = error_type; | |
1017 | return arg; | |
1018 | } | |
1019 | ||
1020 | /* Now search through the virtual function table. */ | |
1021 | entry = value_ind (vtbl); | |
e1ce8aa5 | 1022 | nelems = longest_to_int (value_as_long (value_field (entry, 2))); |
71b16efa JK |
1023 | for (i = 1; i <= nelems; i++) |
1024 | { | |
96b2f51c JG |
1025 | entry = value_subscript (vtbl, value_from_longest (builtin_type_int, |
1026 | (LONGEST) i)); | |
e1ce8aa5 | 1027 | offset = longest_to_int (value_as_long (value_field (entry, 0))); |
bcccec8c PB |
1028 | /* If we use '<=' we can handle single inheritance |
1029 | * where all offsets are zero - just use the first entry found. */ | |
1030 | if (offset <= best_offset) | |
71b16efa JK |
1031 | { |
1032 | best_offset = offset; | |
1033 | best_entry = entry; | |
1034 | } | |
1035 | } | |
71b16efa JK |
1036 | /* Move the pointer according to BEST_ENTRY's offset, and figure |
1037 | out what type we should return as the new pointer. */ | |
bcccec8c PB |
1038 | if (best_entry == 0) |
1039 | { | |
1040 | /* An alternative method (which should no longer be necessary). | |
1041 | * But we leave it in for future use, when we will hopefully | |
1042 | * have optimizes the vtable to use thunks instead of offsets. */ | |
1043 | /* Use the name of vtable itself to extract a base type. */ | |
1044 | demangled_name += 4; /* Skip _vt$ prefix. */ | |
1045 | } | |
1046 | else | |
1047 | { | |
1048 | pc_for_sym = value_as_pointer (value_field (best_entry, 2)); | |
1049 | sym = find_pc_function (pc_for_sym); | |
1050 | demangled_name = cplus_demangle (SYMBOL_NAME (sym), -1); | |
1051 | *(strchr (demangled_name, ':')) = '\0'; | |
1052 | } | |
71b16efa JK |
1053 | sym = lookup_symbol (demangled_name, 0, VAR_NAMESPACE, 0, 0); |
1054 | if (sym == 0) | |
1055 | error ("could not find type declaration for `%s'", SYMBOL_NAME (sym)); | |
bcccec8c PB |
1056 | if (best_entry) |
1057 | { | |
1058 | free (demangled_name); | |
1059 | arg = value_add (value_cast (builtin_type_int, arg), | |
1060 | value_field (best_entry, 0)); | |
1061 | } | |
71b16efa JK |
1062 | VALUE_TYPE (arg) = lookup_pointer_type (SYMBOL_TYPE (sym)); |
1063 | return arg; | |
1064 | } | |
1065 | ||
1066 | /* ARG is a pointer object of type TYPE. If TYPE has virtual | |
1067 | function tables, probe ARG's tables (including the vtables | |
1068 | of its baseclasses) to figure out the most derived type that ARG | |
1069 | could actually be a pointer to. */ | |
1070 | ||
1071 | value | |
1072 | value_from_vtable_info (arg, type) | |
1073 | value arg; | |
1074 | struct type *type; | |
1075 | { | |
1076 | /* Take care of preliminaries. */ | |
1077 | if (TYPE_VPTR_FIELDNO (type) < 0) | |
1078 | fill_in_vptr_fieldno (type); | |
1079 | if (TYPE_VPTR_FIELDNO (type) < 0 || VALUE_REPEATED (arg)) | |
1080 | return 0; | |
1081 | ||
1082 | return value_headof (arg, 0, type); | |
1083 | } | |
1084 | ||
dd3b648e RP |
1085 | /* The value of a static class member does not depend |
1086 | on its instance, only on its type. If FIELDNO >= 0, | |
1087 | then fieldno is a valid field number and is used directly. | |
1088 | Otherwise, FIELDNAME is the name of the field we are | |
1089 | searching for. If it is not a static field name, an | |
1090 | error is signaled. TYPE is the type in which we look for the | |
71b16efa JK |
1091 | static field member. |
1092 | ||
1093 | Return zero if we couldn't find anything; the caller may signal | |
1094 | an error in that case. */ | |
1095 | ||
dd3b648e RP |
1096 | value |
1097 | value_static_field (type, fieldname, fieldno) | |
1098 | register struct type *type; | |
1099 | char *fieldname; | |
1100 | register int fieldno; | |
1101 | { | |
1102 | register value v; | |
1103 | struct symbol *sym; | |
1104 | char *phys_name; | |
1105 | ||
1106 | if (fieldno < 0) | |
1107 | { | |
dd3b648e | 1108 | /* Look for static field. */ |
71b16efa JK |
1109 | int i; |
1110 | for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--) | |
1111 | if (! strcmp (TYPE_FIELD_NAME (type, i), fieldname)) | |
1112 | { | |
1113 | if (TYPE_FIELD_STATIC (type, i)) | |
dd3b648e | 1114 | { |
71b16efa JK |
1115 | fieldno = i; |
1116 | goto found; | |
dd3b648e | 1117 | } |
71b16efa JK |
1118 | else |
1119 | error ("field `%s' is not static", fieldname); | |
1120 | } | |
1121 | for (; i > 0; i--) | |
1122 | { | |
1123 | v = value_static_field (TYPE_BASECLASS (type, i), fieldname, -1); | |
1124 | if (v != 0) | |
1125 | return v; | |
dd3b648e RP |
1126 | } |
1127 | ||
71b16efa | 1128 | if (destructor_name_p (fieldname, type)) |
dd3b648e RP |
1129 | error ("Cannot get value of destructor"); |
1130 | ||
71b16efa | 1131 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--) |
dd3b648e | 1132 | { |
71b16efa JK |
1133 | if (! strcmp (TYPE_FN_FIELDLIST_NAME (type, i), fieldname)) |
1134 | error ("Cannot get value of method \"%s\"", fieldname); | |
dd3b648e RP |
1135 | } |
1136 | error("there is no field named %s", fieldname); | |
1137 | } | |
1138 | ||
1139 | found: | |
1140 | phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno); | |
1141 | sym = lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL); | |
1142 | if (! sym) error ("Internal error: could not find physical static variable named %s", phys_name); | |
1143 | ||
1144 | type = TYPE_FIELD_TYPE (type, fieldno); | |
1145 | v = value_at (type, (CORE_ADDR)SYMBOL_BLOCK_VALUE (sym)); | |
1146 | return v; | |
1147 | } | |
1148 | ||
1149 | /* Compute the address of the baseclass which is | |
f1d77e90 | 1150 | the INDEXth baseclass of class TYPE. The TYPE base |
71b16efa JK |
1151 | of the object is at VALADDR. |
1152 | ||
1153 | If ERRP is non-NULL, set *ERRP to be the errno code of any error, | |
1154 | or 0 if no error. In that case the return value is not the address | |
1155 | of the baseclasss, but the address which could not be read | |
1156 | successfully. */ | |
dd3b648e RP |
1157 | |
1158 | char * | |
71b16efa | 1159 | baseclass_addr (type, index, valaddr, valuep, errp) |
dd3b648e RP |
1160 | struct type *type; |
1161 | int index; | |
1162 | char *valaddr; | |
1163 | value *valuep; | |
71b16efa | 1164 | int *errp; |
dd3b648e RP |
1165 | { |
1166 | struct type *basetype = TYPE_BASECLASS (type, index); | |
1167 | ||
71b16efa JK |
1168 | if (errp) |
1169 | *errp = 0; | |
aec4cb91 | 1170 | |
dd3b648e RP |
1171 | if (BASETYPE_VIA_VIRTUAL (type, index)) |
1172 | { | |
1173 | /* Must hunt for the pointer to this virtual baseclass. */ | |
1174 | register int i, len = TYPE_NFIELDS (type); | |
1175 | register int n_baseclasses = TYPE_N_BASECLASSES (type); | |
1176 | char *vbase_name, *type_name = type_name_no_tag (basetype); | |
1177 | ||
dd3b648e RP |
1178 | vbase_name = (char *)alloca (strlen (type_name) + 8); |
1179 | sprintf (vbase_name, "_vb$%s", type_name); | |
1180 | /* First look for the virtual baseclass pointer | |
1181 | in the fields. */ | |
1182 | for (i = n_baseclasses; i < len; i++) | |
1183 | { | |
1184 | if (! strcmp (vbase_name, TYPE_FIELD_NAME (type, i))) | |
1185 | { | |
71b16efa JK |
1186 | value val = allocate_value (basetype); |
1187 | CORE_ADDR addr; | |
1188 | int status; | |
1189 | ||
e1ce8aa5 JK |
1190 | addr |
1191 | = unpack_pointer (TYPE_FIELD_TYPE (type, i), | |
71b16efa JK |
1192 | valaddr + (TYPE_FIELD_BITPOS (type, i) / 8)); |
1193 | ||
1194 | status = target_read_memory (addr, | |
1195 | VALUE_CONTENTS_RAW (val), | |
4f6f12f9 | 1196 | TYPE_LENGTH (basetype)); |
71b16efa JK |
1197 | VALUE_LVAL (val) = lval_memory; |
1198 | VALUE_ADDRESS (val) = addr; | |
1199 | ||
1200 | if (status != 0) | |
1201 | { | |
1202 | if (valuep) | |
1203 | *valuep = NULL; | |
1204 | release_value (val); | |
1205 | value_free (val); | |
1206 | if (errp) | |
1207 | *errp = status; | |
1208 | return (char *)addr; | |
1209 | } | |
1210 | else | |
1211 | { | |
1212 | if (valuep) | |
1213 | *valuep = val; | |
1214 | return (char *) VALUE_CONTENTS (val); | |
1215 | } | |
dd3b648e RP |
1216 | } |
1217 | } | |
1218 | /* Not in the fields, so try looking through the baseclasses. */ | |
1219 | for (i = index+1; i < n_baseclasses; i++) | |
1220 | { | |
1221 | char *baddr; | |
1222 | ||
e1ce8aa5 | 1223 | baddr = baseclass_addr (type, i, valaddr, valuep, errp); |
dd3b648e RP |
1224 | if (baddr) |
1225 | return baddr; | |
1226 | } | |
1227 | /* Not found. */ | |
1228 | if (valuep) | |
1229 | *valuep = 0; | |
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | /* Baseclass is easily computed. */ | |
1234 | if (valuep) | |
1235 | *valuep = 0; | |
1236 | return valaddr + TYPE_BASECLASS_BITPOS (type, index) / 8; | |
1237 | } | |
dd3b648e RP |
1238 | \f |
1239 | long | |
1240 | unpack_field_as_long (type, valaddr, fieldno) | |
1241 | struct type *type; | |
1242 | char *valaddr; | |
1243 | int fieldno; | |
1244 | { | |
1245 | long val; | |
1246 | int bitpos = TYPE_FIELD_BITPOS (type, fieldno); | |
1247 | int bitsize = TYPE_FIELD_BITSIZE (type, fieldno); | |
1248 | ||
1249 | bcopy (valaddr + bitpos / 8, &val, sizeof val); | |
1250 | SWAP_TARGET_AND_HOST (&val, sizeof val); | |
1251 | ||
1252 | /* Extracting bits depends on endianness of the machine. */ | |
122ad9ab | 1253 | #if BITS_BIG_ENDIAN |
dd3b648e RP |
1254 | val = val >> (sizeof val * 8 - bitpos % 8 - bitsize); |
1255 | #else | |
1256 | val = val >> (bitpos % 8); | |
1257 | #endif | |
1258 | ||
c3a21801 JG |
1259 | if (bitsize < 8 * sizeof (val)) |
1260 | val &= (((unsigned long)1) << bitsize) - 1; | |
dd3b648e RP |
1261 | return val; |
1262 | } | |
1263 | ||
3f2e006b JG |
1264 | /* Modify the value of a bitfield. ADDR points to a block of memory in |
1265 | target byte order; the bitfield starts in the byte pointed to. FIELDVAL | |
1266 | is the desired value of the field, in host byte order. BITPOS and BITSIZE | |
1267 | indicate which bits (in target bit order) comprise the bitfield. */ | |
1268 | ||
dd3b648e RP |
1269 | void |
1270 | modify_field (addr, fieldval, bitpos, bitsize) | |
1271 | char *addr; | |
1272 | int fieldval; | |
1273 | int bitpos, bitsize; | |
1274 | { | |
1275 | long oword; | |
1276 | ||
c3a21801 JG |
1277 | /* Reject values too big to fit in the field in question, |
1278 | otherwise adjoining fields may be corrupted. */ | |
61a7292f SG |
1279 | if (bitsize < (8 * sizeof (fieldval)) |
1280 | && 0 != (fieldval & ~((1<<bitsize)-1))) | |
dd3b648e RP |
1281 | error ("Value %d does not fit in %d bits.", fieldval, bitsize); |
1282 | ||
1283 | bcopy (addr, &oword, sizeof oword); | |
3f2e006b | 1284 | SWAP_TARGET_AND_HOST (&oword, sizeof oword); /* To host format */ |
dd3b648e | 1285 | |
3f2e006b | 1286 | /* Shifting for bit field depends on endianness of the target machine. */ |
122ad9ab | 1287 | #if BITS_BIG_ENDIAN |
dd3b648e RP |
1288 | bitpos = sizeof (oword) * 8 - bitpos - bitsize; |
1289 | #endif | |
1290 | ||
c3a21801 JG |
1291 | /* Mask out old value, while avoiding shifts >= longword size */ |
1292 | if (bitsize < 8 * sizeof (oword)) | |
1293 | oword &= ~(((((unsigned long)1) << bitsize) - 1) << bitpos); | |
1294 | else | |
1295 | oword &= ~((-1) << bitpos); | |
dd3b648e | 1296 | oword |= fieldval << bitpos; |
3f2e006b JG |
1297 | |
1298 | SWAP_TARGET_AND_HOST (&oword, sizeof oword); /* To target format */ | |
dd3b648e RP |
1299 | bcopy (&oword, addr, sizeof oword); |
1300 | } | |
1301 | \f | |
1302 | /* Convert C numbers into newly allocated values */ | |
1303 | ||
1304 | value | |
96b2f51c | 1305 | value_from_longest (type, num) |
dd3b648e RP |
1306 | struct type *type; |
1307 | register LONGEST num; | |
1308 | { | |
1309 | register value val = allocate_value (type); | |
1310 | register enum type_code code = TYPE_CODE (type); | |
1311 | register int len = TYPE_LENGTH (type); | |
1312 | ||
96b2f51c JG |
1313 | /* FIXME, we assume that pointers have the same form and byte order as |
1314 | integers, and that all pointers have the same form. */ | |
35505d07 JG |
1315 | if (code == TYPE_CODE_INT || code == TYPE_CODE_ENUM || |
1316 | code == TYPE_CODE_CHAR || code == TYPE_CODE_PTR) | |
dd3b648e RP |
1317 | { |
1318 | if (len == sizeof (char)) | |
1319 | * (char *) VALUE_CONTENTS_RAW (val) = num; | |
1320 | else if (len == sizeof (short)) | |
1321 | * (short *) VALUE_CONTENTS_RAW (val) = num; | |
1322 | else if (len == sizeof (int)) | |
1323 | * (int *) VALUE_CONTENTS_RAW (val) = num; | |
1324 | else if (len == sizeof (long)) | |
1325 | * (long *) VALUE_CONTENTS_RAW (val) = num; | |
1326 | #ifdef LONG_LONG | |
1327 | else if (len == sizeof (long long)) | |
1328 | * (long long *) VALUE_CONTENTS_RAW (val) = num; | |
1329 | #endif | |
1330 | else | |
1331 | error ("Integer type encountered with unexpected data length."); | |
1332 | } | |
1333 | else | |
1334 | error ("Unexpected type encountered for integer constant."); | |
1335 | ||
1336 | /* num was in host byte order. So now put the value's contents | |
1337 | into target byte order. */ | |
1338 | SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (val), len); | |
1339 | ||
1340 | return val; | |
1341 | } | |
1342 | ||
1343 | value | |
1344 | value_from_double (type, num) | |
1345 | struct type *type; | |
1346 | double num; | |
1347 | { | |
1348 | register value val = allocate_value (type); | |
1349 | register enum type_code code = TYPE_CODE (type); | |
1350 | register int len = TYPE_LENGTH (type); | |
1351 | ||
1352 | if (code == TYPE_CODE_FLT) | |
1353 | { | |
1354 | if (len == sizeof (float)) | |
1355 | * (float *) VALUE_CONTENTS_RAW (val) = num; | |
1356 | else if (len == sizeof (double)) | |
1357 | * (double *) VALUE_CONTENTS_RAW (val) = num; | |
1358 | else | |
1359 | error ("Floating type encountered with unexpected data length."); | |
1360 | } | |
1361 | else | |
1362 | error ("Unexpected type encountered for floating constant."); | |
1363 | ||
1364 | /* num was in host byte order. So now put the value's contents | |
1365 | into target byte order. */ | |
1366 | SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (val), len); | |
1367 | ||
1368 | return val; | |
1369 | } | |
1370 | \f | |
1371 | /* Deal with the value that is "about to be returned". */ | |
1372 | ||
1373 | /* Return the value that a function returning now | |
1374 | would be returning to its caller, assuming its type is VALTYPE. | |
1375 | RETBUF is where we look for what ought to be the contents | |
1376 | of the registers (in raw form). This is because it is often | |
1377 | desirable to restore old values to those registers | |
1378 | after saving the contents of interest, and then call | |
1379 | this function using the saved values. | |
1380 | struct_return is non-zero when the function in question is | |
1381 | using the structure return conventions on the machine in question; | |
1382 | 0 when it is using the value returning conventions (this often | |
1383 | means returning pointer to where structure is vs. returning value). */ | |
1384 | ||
1385 | value | |
1386 | value_being_returned (valtype, retbuf, struct_return) | |
1387 | register struct type *valtype; | |
1388 | char retbuf[REGISTER_BYTES]; | |
1389 | int struct_return; | |
1390 | /*ARGSUSED*/ | |
1391 | { | |
1392 | register value val; | |
1393 | CORE_ADDR addr; | |
1394 | ||
1395 | #if defined (EXTRACT_STRUCT_VALUE_ADDRESS) | |
1396 | /* If this is not defined, just use EXTRACT_RETURN_VALUE instead. */ | |
1397 | if (struct_return) { | |
1398 | addr = EXTRACT_STRUCT_VALUE_ADDRESS (retbuf); | |
1399 | if (!addr) | |
1400 | error ("Function return value unknown"); | |
1401 | return value_at (valtype, addr); | |
1402 | } | |
1403 | #endif | |
1404 | ||
1405 | val = allocate_value (valtype); | |
1406 | EXTRACT_RETURN_VALUE (valtype, retbuf, VALUE_CONTENTS_RAW (val)); | |
1407 | ||
1408 | return val; | |
1409 | } | |
1410 | ||
1411 | /* Should we use EXTRACT_STRUCT_VALUE_ADDRESS instead of | |
1412 | EXTRACT_RETURN_VALUE? GCC_P is true if compiled with gcc | |
1413 | and TYPE is the type (which is known to be struct, union or array). | |
1414 | ||
1415 | On most machines, the struct convention is used unless we are | |
1416 | using gcc and the type is of a special size. */ | |
1417 | #if !defined (USE_STRUCT_CONVENTION) | |
1418 | #define USE_STRUCT_CONVENTION(gcc_p, type)\ | |
1419 | (!((gcc_p) && (TYPE_LENGTH (value_type) == 1 \ | |
1420 | || TYPE_LENGTH (value_type) == 2 \ | |
1421 | || TYPE_LENGTH (value_type) == 4 \ | |
1422 | || TYPE_LENGTH (value_type) == 8 \ | |
1423 | ) \ | |
1424 | )) | |
1425 | #endif | |
1426 | ||
1427 | /* Return true if the function specified is using the structure returning | |
1428 | convention on this machine to return arguments, or 0 if it is using | |
1429 | the value returning convention. FUNCTION is the value representing | |
1430 | the function, FUNCADDR is the address of the function, and VALUE_TYPE | |
1431 | is the type returned by the function. GCC_P is nonzero if compiled | |
1432 | with GCC. */ | |
1433 | ||
1434 | int | |
1435 | using_struct_return (function, funcaddr, value_type, gcc_p) | |
1436 | value function; | |
1437 | CORE_ADDR funcaddr; | |
1438 | struct type *value_type; | |
1439 | int gcc_p; | |
1440 | /*ARGSUSED*/ | |
1441 | { | |
1442 | register enum type_code code = TYPE_CODE (value_type); | |
1443 | ||
1444 | if (code == TYPE_CODE_ERROR) | |
1445 | error ("Function return type unknown."); | |
1446 | ||
1447 | if (code == TYPE_CODE_STRUCT || | |
1448 | code == TYPE_CODE_UNION || | |
1449 | code == TYPE_CODE_ARRAY) | |
1450 | return USE_STRUCT_CONVENTION (gcc_p, value_type); | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | /* Store VAL so it will be returned if a function returns now. | |
1456 | Does not verify that VAL's type matches what the current | |
1457 | function wants to return. */ | |
1458 | ||
1459 | void | |
1460 | set_return_value (val) | |
1461 | value val; | |
1462 | { | |
1463 | register enum type_code code = TYPE_CODE (VALUE_TYPE (val)); | |
1464 | double dbuf; | |
1465 | LONGEST lbuf; | |
1466 | ||
1467 | if (code == TYPE_CODE_ERROR) | |
1468 | error ("Function return type unknown."); | |
1469 | ||
f1d77e90 JG |
1470 | if ( code == TYPE_CODE_STRUCT |
1471 | || code == TYPE_CODE_UNION) /* FIXME, implement struct return. */ | |
1472 | error ("GDB does not support specifying a struct or union return value."); | |
dd3b648e RP |
1473 | |
1474 | /* FIXME, this is bogus. We don't know what the return conventions | |
1475 | are, or how values should be promoted.... */ | |
1476 | if (code == TYPE_CODE_FLT) | |
1477 | { | |
1478 | dbuf = value_as_double (val); | |
1479 | ||
1480 | STORE_RETURN_VALUE (VALUE_TYPE (val), (char *)&dbuf); | |
1481 | } | |
1482 | else | |
1483 | { | |
1484 | lbuf = value_as_long (val); | |
1485 | STORE_RETURN_VALUE (VALUE_TYPE (val), (char *)&lbuf); | |
1486 | } | |
1487 | } | |
1488 | \f | |
1489 | void | |
1490 | _initialize_values () | |
1491 | { | |
f266e564 | 1492 | add_cmd ("convenience", no_class, show_convenience, |
dd3b648e RP |
1493 | "Debugger convenience (\"$foo\") variables.\n\ |
1494 | These variables are created when you assign them values;\n\ | |
1495 | thus, \"print $foo=1\" gives \"$foo\" the value 1. Values may be any type.\n\n\ | |
1496 | A few convenience variables are given values automatically:\n\ | |
1497 | \"$_\"holds the last address examined with \"x\" or \"info lines\",\n\ | |
f266e564 JK |
1498 | \"$__\" holds the contents of the last address examined with \"x\".", |
1499 | &showlist); | |
dd3b648e | 1500 | |
f266e564 JK |
1501 | add_cmd ("values", no_class, show_values, |
1502 | "Elements of value history around item number IDX (or last ten).", | |
1503 | &showlist); | |
dd3b648e | 1504 | } |