Commit | Line | Data |
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c906108c | 1 | /* Low level packing and unpacking of values for GDB, the GNU Debugger. |
1bac305b | 2 | |
6aba47ca DJ |
3 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
4 | 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007 | |
4f2aea11 | 5 | Free Software Foundation, Inc. |
c906108c | 6 | |
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "gdb_string.h" | |
24 | #include "symtab.h" | |
25 | #include "gdbtypes.h" | |
26 | #include "value.h" | |
27 | #include "gdbcore.h" | |
c906108c SS |
28 | #include "command.h" |
29 | #include "gdbcmd.h" | |
30 | #include "target.h" | |
31 | #include "language.h" | |
c906108c | 32 | #include "demangle.h" |
d16aafd8 | 33 | #include "doublest.h" |
5ae326fa | 34 | #include "gdb_assert.h" |
36160dc4 | 35 | #include "regcache.h" |
fe898f56 | 36 | #include "block.h" |
c906108c SS |
37 | |
38 | /* Prototypes for exported functions. */ | |
39 | ||
a14ed312 | 40 | void _initialize_values (void); |
c906108c | 41 | |
91294c83 AC |
42 | struct value |
43 | { | |
44 | /* Type of value; either not an lval, or one of the various | |
45 | different possible kinds of lval. */ | |
46 | enum lval_type lval; | |
47 | ||
48 | /* Is it modifiable? Only relevant if lval != not_lval. */ | |
49 | int modifiable; | |
50 | ||
51 | /* Location of value (if lval). */ | |
52 | union | |
53 | { | |
54 | /* If lval == lval_memory, this is the address in the inferior. | |
55 | If lval == lval_register, this is the byte offset into the | |
56 | registers structure. */ | |
57 | CORE_ADDR address; | |
58 | ||
59 | /* Pointer to internal variable. */ | |
60 | struct internalvar *internalvar; | |
61 | } location; | |
62 | ||
63 | /* Describes offset of a value within lval of a structure in bytes. | |
64 | If lval == lval_memory, this is an offset to the address. If | |
65 | lval == lval_register, this is a further offset from | |
66 | location.address within the registers structure. Note also the | |
67 | member embedded_offset below. */ | |
68 | int offset; | |
69 | ||
70 | /* Only used for bitfields; number of bits contained in them. */ | |
71 | int bitsize; | |
72 | ||
73 | /* Only used for bitfields; position of start of field. For | |
74 | BITS_BIG_ENDIAN=0 targets, it is the position of the LSB. For | |
75 | BITS_BIG_ENDIAN=1 targets, it is the position of the MSB. */ | |
76 | int bitpos; | |
77 | ||
78 | /* Frame register value is relative to. This will be described in | |
79 | the lval enum above as "lval_register". */ | |
80 | struct frame_id frame_id; | |
81 | ||
82 | /* Type of the value. */ | |
83 | struct type *type; | |
84 | ||
85 | /* If a value represents a C++ object, then the `type' field gives | |
86 | the object's compile-time type. If the object actually belongs | |
87 | to some class derived from `type', perhaps with other base | |
88 | classes and additional members, then `type' is just a subobject | |
89 | of the real thing, and the full object is probably larger than | |
90 | `type' would suggest. | |
91 | ||
92 | If `type' is a dynamic class (i.e. one with a vtable), then GDB | |
93 | can actually determine the object's run-time type by looking at | |
94 | the run-time type information in the vtable. When this | |
95 | information is available, we may elect to read in the entire | |
96 | object, for several reasons: | |
97 | ||
98 | - When printing the value, the user would probably rather see the | |
99 | full object, not just the limited portion apparent from the | |
100 | compile-time type. | |
101 | ||
102 | - If `type' has virtual base classes, then even printing `type' | |
103 | alone may require reaching outside the `type' portion of the | |
104 | object to wherever the virtual base class has been stored. | |
105 | ||
106 | When we store the entire object, `enclosing_type' is the run-time | |
107 | type -- the complete object -- and `embedded_offset' is the | |
108 | offset of `type' within that larger type, in bytes. The | |
109 | value_contents() macro takes `embedded_offset' into account, so | |
110 | most GDB code continues to see the `type' portion of the value, | |
111 | just as the inferior would. | |
112 | ||
113 | If `type' is a pointer to an object, then `enclosing_type' is a | |
114 | pointer to the object's run-time type, and `pointed_to_offset' is | |
115 | the offset in bytes from the full object to the pointed-to object | |
116 | -- that is, the value `embedded_offset' would have if we followed | |
117 | the pointer and fetched the complete object. (I don't really see | |
118 | the point. Why not just determine the run-time type when you | |
119 | indirect, and avoid the special case? The contents don't matter | |
120 | until you indirect anyway.) | |
121 | ||
122 | If we're not doing anything fancy, `enclosing_type' is equal to | |
123 | `type', and `embedded_offset' is zero, so everything works | |
124 | normally. */ | |
125 | struct type *enclosing_type; | |
126 | int embedded_offset; | |
127 | int pointed_to_offset; | |
128 | ||
129 | /* Values are stored in a chain, so that they can be deleted easily | |
130 | over calls to the inferior. Values assigned to internal | |
131 | variables or put into the value history are taken off this | |
132 | list. */ | |
133 | struct value *next; | |
134 | ||
135 | /* Register number if the value is from a register. */ | |
136 | short regnum; | |
137 | ||
138 | /* If zero, contents of this value are in the contents field. If | |
139 | nonzero, contents are in inferior memory at address in the | |
140 | location.address field plus the offset field (and the lval field | |
141 | should be lval_memory). | |
142 | ||
143 | WARNING: This field is used by the code which handles watchpoints | |
144 | (see breakpoint.c) to decide whether a particular value can be | |
145 | watched by hardware watchpoints. If the lazy flag is set for | |
146 | some member of a value chain, it is assumed that this member of | |
147 | the chain doesn't need to be watched as part of watching the | |
148 | value itself. This is how GDB avoids watching the entire struct | |
149 | or array when the user wants to watch a single struct member or | |
150 | array element. If you ever change the way lazy flag is set and | |
151 | reset, be sure to consider this use as well! */ | |
152 | char lazy; | |
153 | ||
154 | /* If nonzero, this is the value of a variable which does not | |
155 | actually exist in the program. */ | |
156 | char optimized_out; | |
157 | ||
42be36b3 CT |
158 | /* If value is a variable, is it initialized or not. */ |
159 | int initialized; | |
160 | ||
91294c83 AC |
161 | /* Actual contents of the value. For use of this value; setting it |
162 | uses the stuff above. Not valid if lazy is nonzero. Target | |
163 | byte-order. We force it to be aligned properly for any possible | |
164 | value. Note that a value therefore extends beyond what is | |
165 | declared here. */ | |
166 | union | |
167 | { | |
fc1a4b47 | 168 | gdb_byte contents[1]; |
91294c83 AC |
169 | DOUBLEST force_doublest_align; |
170 | LONGEST force_longest_align; | |
171 | CORE_ADDR force_core_addr_align; | |
172 | void *force_pointer_align; | |
173 | } aligner; | |
174 | /* Do not add any new members here -- contents above will trash | |
175 | them. */ | |
176 | }; | |
177 | ||
c906108c SS |
178 | /* Prototypes for local functions. */ |
179 | ||
a14ed312 | 180 | static void show_values (char *, int); |
c906108c | 181 | |
a14ed312 | 182 | static void show_convenience (char *, int); |
c906108c | 183 | |
c906108c SS |
184 | |
185 | /* The value-history records all the values printed | |
186 | by print commands during this session. Each chunk | |
187 | records 60 consecutive values. The first chunk on | |
188 | the chain records the most recent values. | |
189 | The total number of values is in value_history_count. */ | |
190 | ||
191 | #define VALUE_HISTORY_CHUNK 60 | |
192 | ||
193 | struct value_history_chunk | |
c5aa993b JM |
194 | { |
195 | struct value_history_chunk *next; | |
f23631e4 | 196 | struct value *values[VALUE_HISTORY_CHUNK]; |
c5aa993b | 197 | }; |
c906108c SS |
198 | |
199 | /* Chain of chunks now in use. */ | |
200 | ||
201 | static struct value_history_chunk *value_history_chain; | |
202 | ||
203 | static int value_history_count; /* Abs number of last entry stored */ | |
204 | \f | |
205 | /* List of all value objects currently allocated | |
206 | (except for those released by calls to release_value) | |
207 | This is so they can be freed after each command. */ | |
208 | ||
f23631e4 | 209 | static struct value *all_values; |
c906108c SS |
210 | |
211 | /* Allocate a value that has the correct length for type TYPE. */ | |
212 | ||
f23631e4 | 213 | struct value * |
fba45db2 | 214 | allocate_value (struct type *type) |
c906108c | 215 | { |
f23631e4 | 216 | struct value *val; |
c906108c SS |
217 | struct type *atype = check_typedef (type); |
218 | ||
5b90c7b5 | 219 | val = (struct value *) xzalloc (sizeof (struct value) + TYPE_LENGTH (atype)); |
df407dfe | 220 | val->next = all_values; |
c906108c | 221 | all_values = val; |
df407dfe | 222 | val->type = type; |
4754a64e | 223 | val->enclosing_type = type; |
c906108c SS |
224 | VALUE_LVAL (val) = not_lval; |
225 | VALUE_ADDRESS (val) = 0; | |
1df6926e | 226 | VALUE_FRAME_ID (val) = null_frame_id; |
df407dfe AC |
227 | val->offset = 0; |
228 | val->bitpos = 0; | |
229 | val->bitsize = 0; | |
9ee8fc9d | 230 | VALUE_REGNUM (val) = -1; |
d69fe07e | 231 | val->lazy = 0; |
feb13ab0 | 232 | val->optimized_out = 0; |
13c3b5f5 | 233 | val->embedded_offset = 0; |
b44d461b | 234 | val->pointed_to_offset = 0; |
c906108c | 235 | val->modifiable = 1; |
42be36b3 | 236 | val->initialized = 1; /* Default to initialized. */ |
c906108c SS |
237 | return val; |
238 | } | |
239 | ||
240 | /* Allocate a value that has the correct length | |
241 | for COUNT repetitions type TYPE. */ | |
242 | ||
f23631e4 | 243 | struct value * |
fba45db2 | 244 | allocate_repeat_value (struct type *type, int count) |
c906108c | 245 | { |
c5aa993b | 246 | int low_bound = current_language->string_lower_bound; /* ??? */ |
c906108c SS |
247 | /* FIXME-type-allocation: need a way to free this type when we are |
248 | done with it. */ | |
249 | struct type *range_type | |
c5aa993b JM |
250 | = create_range_type ((struct type *) NULL, builtin_type_int, |
251 | low_bound, count + low_bound - 1); | |
c906108c SS |
252 | /* FIXME-type-allocation: need a way to free this type when we are |
253 | done with it. */ | |
254 | return allocate_value (create_array_type ((struct type *) NULL, | |
255 | type, range_type)); | |
256 | } | |
257 | ||
df407dfe AC |
258 | /* Accessor methods. */ |
259 | ||
17cf0ecd AC |
260 | struct value * |
261 | value_next (struct value *value) | |
262 | { | |
263 | return value->next; | |
264 | } | |
265 | ||
df407dfe AC |
266 | struct type * |
267 | value_type (struct value *value) | |
268 | { | |
269 | return value->type; | |
270 | } | |
04624583 AC |
271 | void |
272 | deprecated_set_value_type (struct value *value, struct type *type) | |
273 | { | |
274 | value->type = type; | |
275 | } | |
df407dfe AC |
276 | |
277 | int | |
278 | value_offset (struct value *value) | |
279 | { | |
280 | return value->offset; | |
281 | } | |
f5cf64a7 AC |
282 | void |
283 | set_value_offset (struct value *value, int offset) | |
284 | { | |
285 | value->offset = offset; | |
286 | } | |
df407dfe AC |
287 | |
288 | int | |
289 | value_bitpos (struct value *value) | |
290 | { | |
291 | return value->bitpos; | |
292 | } | |
9bbda503 AC |
293 | void |
294 | set_value_bitpos (struct value *value, int bit) | |
295 | { | |
296 | value->bitpos = bit; | |
297 | } | |
df407dfe AC |
298 | |
299 | int | |
300 | value_bitsize (struct value *value) | |
301 | { | |
302 | return value->bitsize; | |
303 | } | |
9bbda503 AC |
304 | void |
305 | set_value_bitsize (struct value *value, int bit) | |
306 | { | |
307 | value->bitsize = bit; | |
308 | } | |
df407dfe | 309 | |
fc1a4b47 | 310 | gdb_byte * |
990a07ab AC |
311 | value_contents_raw (struct value *value) |
312 | { | |
313 | return value->aligner.contents + value->embedded_offset; | |
314 | } | |
315 | ||
fc1a4b47 | 316 | gdb_byte * |
990a07ab AC |
317 | value_contents_all_raw (struct value *value) |
318 | { | |
319 | return value->aligner.contents; | |
320 | } | |
321 | ||
4754a64e AC |
322 | struct type * |
323 | value_enclosing_type (struct value *value) | |
324 | { | |
325 | return value->enclosing_type; | |
326 | } | |
327 | ||
fc1a4b47 | 328 | const gdb_byte * |
46615f07 AC |
329 | value_contents_all (struct value *value) |
330 | { | |
331 | if (value->lazy) | |
332 | value_fetch_lazy (value); | |
333 | return value->aligner.contents; | |
334 | } | |
335 | ||
d69fe07e AC |
336 | int |
337 | value_lazy (struct value *value) | |
338 | { | |
339 | return value->lazy; | |
340 | } | |
341 | ||
dfa52d88 AC |
342 | void |
343 | set_value_lazy (struct value *value, int val) | |
344 | { | |
345 | value->lazy = val; | |
346 | } | |
347 | ||
fc1a4b47 | 348 | const gdb_byte * |
0fd88904 AC |
349 | value_contents (struct value *value) |
350 | { | |
351 | return value_contents_writeable (value); | |
352 | } | |
353 | ||
fc1a4b47 | 354 | gdb_byte * |
0fd88904 AC |
355 | value_contents_writeable (struct value *value) |
356 | { | |
357 | if (value->lazy) | |
358 | value_fetch_lazy (value); | |
fc0c53a0 | 359 | return value_contents_raw (value); |
0fd88904 AC |
360 | } |
361 | ||
a6c442d8 MK |
362 | /* Return non-zero if VAL1 and VAL2 have the same contents. Note that |
363 | this function is different from value_equal; in C the operator == | |
364 | can return 0 even if the two values being compared are equal. */ | |
365 | ||
366 | int | |
367 | value_contents_equal (struct value *val1, struct value *val2) | |
368 | { | |
369 | struct type *type1; | |
370 | struct type *type2; | |
371 | int len; | |
372 | ||
373 | type1 = check_typedef (value_type (val1)); | |
374 | type2 = check_typedef (value_type (val2)); | |
375 | len = TYPE_LENGTH (type1); | |
376 | if (len != TYPE_LENGTH (type2)) | |
377 | return 0; | |
378 | ||
379 | return (memcmp (value_contents (val1), value_contents (val2), len) == 0); | |
380 | } | |
381 | ||
feb13ab0 AC |
382 | int |
383 | value_optimized_out (struct value *value) | |
384 | { | |
385 | return value->optimized_out; | |
386 | } | |
387 | ||
388 | void | |
389 | set_value_optimized_out (struct value *value, int val) | |
390 | { | |
391 | value->optimized_out = val; | |
392 | } | |
13c3b5f5 AC |
393 | |
394 | int | |
395 | value_embedded_offset (struct value *value) | |
396 | { | |
397 | return value->embedded_offset; | |
398 | } | |
399 | ||
400 | void | |
401 | set_value_embedded_offset (struct value *value, int val) | |
402 | { | |
403 | value->embedded_offset = val; | |
404 | } | |
b44d461b AC |
405 | |
406 | int | |
407 | value_pointed_to_offset (struct value *value) | |
408 | { | |
409 | return value->pointed_to_offset; | |
410 | } | |
411 | ||
412 | void | |
413 | set_value_pointed_to_offset (struct value *value, int val) | |
414 | { | |
415 | value->pointed_to_offset = val; | |
416 | } | |
13bb5560 AC |
417 | |
418 | enum lval_type * | |
419 | deprecated_value_lval_hack (struct value *value) | |
420 | { | |
421 | return &value->lval; | |
422 | } | |
423 | ||
424 | CORE_ADDR * | |
425 | deprecated_value_address_hack (struct value *value) | |
426 | { | |
427 | return &value->location.address; | |
428 | } | |
429 | ||
430 | struct internalvar ** | |
431 | deprecated_value_internalvar_hack (struct value *value) | |
432 | { | |
433 | return &value->location.internalvar; | |
434 | } | |
435 | ||
436 | struct frame_id * | |
437 | deprecated_value_frame_id_hack (struct value *value) | |
438 | { | |
439 | return &value->frame_id; | |
440 | } | |
441 | ||
442 | short * | |
443 | deprecated_value_regnum_hack (struct value *value) | |
444 | { | |
445 | return &value->regnum; | |
446 | } | |
88e3b34b AC |
447 | |
448 | int | |
449 | deprecated_value_modifiable (struct value *value) | |
450 | { | |
451 | return value->modifiable; | |
452 | } | |
453 | void | |
454 | deprecated_set_value_modifiable (struct value *value, int modifiable) | |
455 | { | |
456 | value->modifiable = modifiable; | |
457 | } | |
990a07ab | 458 | \f |
c906108c SS |
459 | /* Return a mark in the value chain. All values allocated after the |
460 | mark is obtained (except for those released) are subject to being freed | |
461 | if a subsequent value_free_to_mark is passed the mark. */ | |
f23631e4 | 462 | struct value * |
fba45db2 | 463 | value_mark (void) |
c906108c SS |
464 | { |
465 | return all_values; | |
466 | } | |
467 | ||
468 | /* Free all values allocated since MARK was obtained by value_mark | |
469 | (except for those released). */ | |
470 | void | |
f23631e4 | 471 | value_free_to_mark (struct value *mark) |
c906108c | 472 | { |
f23631e4 AC |
473 | struct value *val; |
474 | struct value *next; | |
c906108c SS |
475 | |
476 | for (val = all_values; val && val != mark; val = next) | |
477 | { | |
df407dfe | 478 | next = val->next; |
c906108c SS |
479 | value_free (val); |
480 | } | |
481 | all_values = val; | |
482 | } | |
483 | ||
484 | /* Free all the values that have been allocated (except for those released). | |
485 | Called after each command, successful or not. */ | |
486 | ||
487 | void | |
fba45db2 | 488 | free_all_values (void) |
c906108c | 489 | { |
f23631e4 AC |
490 | struct value *val; |
491 | struct value *next; | |
c906108c SS |
492 | |
493 | for (val = all_values; val; val = next) | |
494 | { | |
df407dfe | 495 | next = val->next; |
c906108c SS |
496 | value_free (val); |
497 | } | |
498 | ||
499 | all_values = 0; | |
500 | } | |
501 | ||
502 | /* Remove VAL from the chain all_values | |
503 | so it will not be freed automatically. */ | |
504 | ||
505 | void | |
f23631e4 | 506 | release_value (struct value *val) |
c906108c | 507 | { |
f23631e4 | 508 | struct value *v; |
c906108c SS |
509 | |
510 | if (all_values == val) | |
511 | { | |
512 | all_values = val->next; | |
513 | return; | |
514 | } | |
515 | ||
516 | for (v = all_values; v; v = v->next) | |
517 | { | |
518 | if (v->next == val) | |
519 | { | |
520 | v->next = val->next; | |
521 | break; | |
522 | } | |
523 | } | |
524 | } | |
525 | ||
526 | /* Release all values up to mark */ | |
f23631e4 AC |
527 | struct value * |
528 | value_release_to_mark (struct value *mark) | |
c906108c | 529 | { |
f23631e4 AC |
530 | struct value *val; |
531 | struct value *next; | |
c906108c | 532 | |
df407dfe AC |
533 | for (val = next = all_values; next; next = next->next) |
534 | if (next->next == mark) | |
c906108c | 535 | { |
df407dfe AC |
536 | all_values = next->next; |
537 | next->next = NULL; | |
c906108c SS |
538 | return val; |
539 | } | |
540 | all_values = 0; | |
541 | return val; | |
542 | } | |
543 | ||
544 | /* Return a copy of the value ARG. | |
545 | It contains the same contents, for same memory address, | |
546 | but it's a different block of storage. */ | |
547 | ||
f23631e4 AC |
548 | struct value * |
549 | value_copy (struct value *arg) | |
c906108c | 550 | { |
4754a64e | 551 | struct type *encl_type = value_enclosing_type (arg); |
f23631e4 | 552 | struct value *val = allocate_value (encl_type); |
df407dfe | 553 | val->type = arg->type; |
c906108c | 554 | VALUE_LVAL (val) = VALUE_LVAL (arg); |
6f7c8fc2 | 555 | val->location = arg->location; |
df407dfe AC |
556 | val->offset = arg->offset; |
557 | val->bitpos = arg->bitpos; | |
558 | val->bitsize = arg->bitsize; | |
1df6926e | 559 | VALUE_FRAME_ID (val) = VALUE_FRAME_ID (arg); |
9ee8fc9d | 560 | VALUE_REGNUM (val) = VALUE_REGNUM (arg); |
d69fe07e | 561 | val->lazy = arg->lazy; |
feb13ab0 | 562 | val->optimized_out = arg->optimized_out; |
13c3b5f5 | 563 | val->embedded_offset = value_embedded_offset (arg); |
b44d461b | 564 | val->pointed_to_offset = arg->pointed_to_offset; |
c906108c | 565 | val->modifiable = arg->modifiable; |
d69fe07e | 566 | if (!value_lazy (val)) |
c906108c | 567 | { |
990a07ab | 568 | memcpy (value_contents_all_raw (val), value_contents_all_raw (arg), |
4754a64e | 569 | TYPE_LENGTH (value_enclosing_type (arg))); |
c906108c SS |
570 | |
571 | } | |
572 | return val; | |
573 | } | |
574 | \f | |
575 | /* Access to the value history. */ | |
576 | ||
577 | /* Record a new value in the value history. | |
578 | Returns the absolute history index of the entry. | |
579 | Result of -1 indicates the value was not saved; otherwise it is the | |
580 | value history index of this new item. */ | |
581 | ||
582 | int | |
f23631e4 | 583 | record_latest_value (struct value *val) |
c906108c SS |
584 | { |
585 | int i; | |
586 | ||
587 | /* We don't want this value to have anything to do with the inferior anymore. | |
588 | In particular, "set $1 = 50" should not affect the variable from which | |
589 | the value was taken, and fast watchpoints should be able to assume that | |
590 | a value on the value history never changes. */ | |
d69fe07e | 591 | if (value_lazy (val)) |
c906108c SS |
592 | value_fetch_lazy (val); |
593 | /* We preserve VALUE_LVAL so that the user can find out where it was fetched | |
594 | from. This is a bit dubious, because then *&$1 does not just return $1 | |
595 | but the current contents of that location. c'est la vie... */ | |
596 | val->modifiable = 0; | |
597 | release_value (val); | |
598 | ||
599 | /* Here we treat value_history_count as origin-zero | |
600 | and applying to the value being stored now. */ | |
601 | ||
602 | i = value_history_count % VALUE_HISTORY_CHUNK; | |
603 | if (i == 0) | |
604 | { | |
f23631e4 | 605 | struct value_history_chunk *new |
c5aa993b JM |
606 | = (struct value_history_chunk *) |
607 | xmalloc (sizeof (struct value_history_chunk)); | |
c906108c SS |
608 | memset (new->values, 0, sizeof new->values); |
609 | new->next = value_history_chain; | |
610 | value_history_chain = new; | |
611 | } | |
612 | ||
613 | value_history_chain->values[i] = val; | |
614 | ||
615 | /* Now we regard value_history_count as origin-one | |
616 | and applying to the value just stored. */ | |
617 | ||
618 | return ++value_history_count; | |
619 | } | |
620 | ||
621 | /* Return a copy of the value in the history with sequence number NUM. */ | |
622 | ||
f23631e4 | 623 | struct value * |
fba45db2 | 624 | access_value_history (int num) |
c906108c | 625 | { |
f23631e4 | 626 | struct value_history_chunk *chunk; |
52f0bd74 AC |
627 | int i; |
628 | int absnum = num; | |
c906108c SS |
629 | |
630 | if (absnum <= 0) | |
631 | absnum += value_history_count; | |
632 | ||
633 | if (absnum <= 0) | |
634 | { | |
635 | if (num == 0) | |
8a3fe4f8 | 636 | error (_("The history is empty.")); |
c906108c | 637 | else if (num == 1) |
8a3fe4f8 | 638 | error (_("There is only one value in the history.")); |
c906108c | 639 | else |
8a3fe4f8 | 640 | error (_("History does not go back to $$%d."), -num); |
c906108c SS |
641 | } |
642 | if (absnum > value_history_count) | |
8a3fe4f8 | 643 | error (_("History has not yet reached $%d."), absnum); |
c906108c SS |
644 | |
645 | absnum--; | |
646 | ||
647 | /* Now absnum is always absolute and origin zero. */ | |
648 | ||
649 | chunk = value_history_chain; | |
650 | for (i = (value_history_count - 1) / VALUE_HISTORY_CHUNK - absnum / VALUE_HISTORY_CHUNK; | |
651 | i > 0; i--) | |
652 | chunk = chunk->next; | |
653 | ||
654 | return value_copy (chunk->values[absnum % VALUE_HISTORY_CHUNK]); | |
655 | } | |
656 | ||
c906108c | 657 | static void |
fba45db2 | 658 | show_values (char *num_exp, int from_tty) |
c906108c | 659 | { |
52f0bd74 | 660 | int i; |
f23631e4 | 661 | struct value *val; |
c906108c SS |
662 | static int num = 1; |
663 | ||
664 | if (num_exp) | |
665 | { | |
c5aa993b JM |
666 | /* "info history +" should print from the stored position. |
667 | "info history <exp>" should print around value number <exp>. */ | |
c906108c | 668 | if (num_exp[0] != '+' || num_exp[1] != '\0') |
bb518678 | 669 | num = parse_and_eval_long (num_exp) - 5; |
c906108c SS |
670 | } |
671 | else | |
672 | { | |
673 | /* "info history" means print the last 10 values. */ | |
674 | num = value_history_count - 9; | |
675 | } | |
676 | ||
677 | if (num <= 0) | |
678 | num = 1; | |
679 | ||
680 | for (i = num; i < num + 10 && i <= value_history_count; i++) | |
681 | { | |
682 | val = access_value_history (i); | |
a3f17187 | 683 | printf_filtered (("$%d = "), i); |
c906108c | 684 | value_print (val, gdb_stdout, 0, Val_pretty_default); |
a3f17187 | 685 | printf_filtered (("\n")); |
c906108c SS |
686 | } |
687 | ||
688 | /* The next "info history +" should start after what we just printed. */ | |
689 | num += 10; | |
690 | ||
691 | /* Hitting just return after this command should do the same thing as | |
692 | "info history +". If num_exp is null, this is unnecessary, since | |
693 | "info history +" is not useful after "info history". */ | |
694 | if (from_tty && num_exp) | |
695 | { | |
696 | num_exp[0] = '+'; | |
697 | num_exp[1] = '\0'; | |
698 | } | |
699 | } | |
700 | \f | |
701 | /* Internal variables. These are variables within the debugger | |
702 | that hold values assigned by debugger commands. | |
703 | The user refers to them with a '$' prefix | |
704 | that does not appear in the variable names stored internally. */ | |
705 | ||
706 | static struct internalvar *internalvars; | |
707 | ||
53e5f3cf AS |
708 | /* If the variable does not already exist create it and give it the value given. |
709 | If no value is given then the default is zero. */ | |
710 | static void | |
711 | init_if_undefined_command (char* args, int from_tty) | |
712 | { | |
713 | struct internalvar* intvar; | |
714 | ||
715 | /* Parse the expression - this is taken from set_command(). */ | |
716 | struct expression *expr = parse_expression (args); | |
717 | register struct cleanup *old_chain = | |
718 | make_cleanup (free_current_contents, &expr); | |
719 | ||
720 | /* Validate the expression. | |
721 | Was the expression an assignment? | |
722 | Or even an expression at all? */ | |
723 | if (expr->nelts == 0 || expr->elts[0].opcode != BINOP_ASSIGN) | |
724 | error (_("Init-if-undefined requires an assignment expression.")); | |
725 | ||
726 | /* Extract the variable from the parsed expression. | |
727 | In the case of an assign the lvalue will be in elts[1] and elts[2]. */ | |
728 | if (expr->elts[1].opcode != OP_INTERNALVAR) | |
729 | error (_("The first parameter to init-if-undefined should be a GDB variable.")); | |
730 | intvar = expr->elts[2].internalvar; | |
731 | ||
732 | /* Only evaluate the expression if the lvalue is void. | |
733 | This may still fail if the expresssion is invalid. */ | |
734 | if (TYPE_CODE (value_type (intvar->value)) == TYPE_CODE_VOID) | |
735 | evaluate_expression (expr); | |
736 | ||
737 | do_cleanups (old_chain); | |
738 | } | |
739 | ||
740 | ||
c906108c SS |
741 | /* Look up an internal variable with name NAME. NAME should not |
742 | normally include a dollar sign. | |
743 | ||
744 | If the specified internal variable does not exist, | |
745 | one is created, with a void value. */ | |
746 | ||
747 | struct internalvar * | |
fba45db2 | 748 | lookup_internalvar (char *name) |
c906108c | 749 | { |
52f0bd74 | 750 | struct internalvar *var; |
c906108c SS |
751 | |
752 | for (var = internalvars; var; var = var->next) | |
5cb316ef | 753 | if (strcmp (var->name, name) == 0) |
c906108c SS |
754 | return var; |
755 | ||
756 | var = (struct internalvar *) xmalloc (sizeof (struct internalvar)); | |
1754f103 | 757 | var->name = concat (name, (char *)NULL); |
c906108c | 758 | var->value = allocate_value (builtin_type_void); |
0d20ae72 | 759 | var->endian = gdbarch_byte_order (current_gdbarch); |
c906108c SS |
760 | release_value (var->value); |
761 | var->next = internalvars; | |
762 | internalvars = var; | |
763 | return var; | |
764 | } | |
765 | ||
f23631e4 | 766 | struct value * |
fba45db2 | 767 | value_of_internalvar (struct internalvar *var) |
c906108c | 768 | { |
f23631e4 | 769 | struct value *val; |
d3c139e9 AS |
770 | int i, j; |
771 | gdb_byte temp; | |
c906108c | 772 | |
c906108c | 773 | val = value_copy (var->value); |
d69fe07e | 774 | if (value_lazy (val)) |
c906108c SS |
775 | value_fetch_lazy (val); |
776 | VALUE_LVAL (val) = lval_internalvar; | |
777 | VALUE_INTERNALVAR (val) = var; | |
d3c139e9 AS |
778 | |
779 | /* Values are always stored in the target's byte order. When connected to a | |
780 | target this will most likely always be correct, so there's normally no | |
781 | need to worry about it. | |
782 | ||
783 | However, internal variables can be set up before the target endian is | |
784 | known and so may become out of date. Fix it up before anybody sees. | |
785 | ||
786 | Internal variables usually hold simple scalar values, and we can | |
787 | correct those. More complex values (e.g. structures and floating | |
788 | point types) are left alone, because they would be too complicated | |
789 | to correct. */ | |
790 | ||
0d20ae72 | 791 | if (var->endian != gdbarch_byte_order (current_gdbarch)) |
d3c139e9 AS |
792 | { |
793 | gdb_byte *array = value_contents_raw (val); | |
794 | struct type *type = check_typedef (value_enclosing_type (val)); | |
795 | switch (TYPE_CODE (type)) | |
796 | { | |
797 | case TYPE_CODE_INT: | |
798 | case TYPE_CODE_PTR: | |
799 | /* Reverse the bytes. */ | |
800 | for (i = 0, j = TYPE_LENGTH (type) - 1; i < j; i++, j--) | |
801 | { | |
802 | temp = array[j]; | |
803 | array[j] = array[i]; | |
804 | array[i] = temp; | |
805 | } | |
806 | break; | |
807 | } | |
808 | } | |
809 | ||
c906108c SS |
810 | return val; |
811 | } | |
812 | ||
813 | void | |
fba45db2 | 814 | set_internalvar_component (struct internalvar *var, int offset, int bitpos, |
f23631e4 | 815 | int bitsize, struct value *newval) |
c906108c | 816 | { |
fc1a4b47 | 817 | gdb_byte *addr = value_contents_writeable (var->value) + offset; |
c906108c | 818 | |
c906108c SS |
819 | if (bitsize) |
820 | modify_field (addr, value_as_long (newval), | |
821 | bitpos, bitsize); | |
822 | else | |
0fd88904 | 823 | memcpy (addr, value_contents (newval), TYPE_LENGTH (value_type (newval))); |
c906108c SS |
824 | } |
825 | ||
826 | void | |
f23631e4 | 827 | set_internalvar (struct internalvar *var, struct value *val) |
c906108c | 828 | { |
f23631e4 | 829 | struct value *newval; |
c906108c | 830 | |
c906108c SS |
831 | newval = value_copy (val); |
832 | newval->modifiable = 1; | |
833 | ||
834 | /* Force the value to be fetched from the target now, to avoid problems | |
835 | later when this internalvar is referenced and the target is gone or | |
836 | has changed. */ | |
d69fe07e | 837 | if (value_lazy (newval)) |
c906108c SS |
838 | value_fetch_lazy (newval); |
839 | ||
840 | /* Begin code which must not call error(). If var->value points to | |
841 | something free'd, an error() obviously leaves a dangling pointer. | |
842 | But we also get a danling pointer if var->value points to | |
843 | something in the value chain (i.e., before release_value is | |
844 | called), because after the error free_all_values will get called before | |
845 | long. */ | |
b8c9b27d | 846 | xfree (var->value); |
c906108c | 847 | var->value = newval; |
0d20ae72 | 848 | var->endian = gdbarch_byte_order (current_gdbarch); |
c906108c SS |
849 | release_value (newval); |
850 | /* End code which must not call error(). */ | |
851 | } | |
852 | ||
853 | char * | |
fba45db2 | 854 | internalvar_name (struct internalvar *var) |
c906108c SS |
855 | { |
856 | return var->name; | |
857 | } | |
858 | ||
ae5a43e0 DJ |
859 | /* Update VALUE before discarding OBJFILE. COPIED_TYPES is used to |
860 | prevent cycles / duplicates. */ | |
861 | ||
862 | static void | |
863 | preserve_one_value (struct value *value, struct objfile *objfile, | |
864 | htab_t copied_types) | |
865 | { | |
866 | if (TYPE_OBJFILE (value->type) == objfile) | |
867 | value->type = copy_type_recursive (objfile, value->type, copied_types); | |
868 | ||
869 | if (TYPE_OBJFILE (value->enclosing_type) == objfile) | |
870 | value->enclosing_type = copy_type_recursive (objfile, | |
871 | value->enclosing_type, | |
872 | copied_types); | |
873 | } | |
874 | ||
875 | /* Update the internal variables and value history when OBJFILE is | |
876 | discarded; we must copy the types out of the objfile. New global types | |
877 | will be created for every convenience variable which currently points to | |
878 | this objfile's types, and the convenience variables will be adjusted to | |
879 | use the new global types. */ | |
c906108c SS |
880 | |
881 | void | |
ae5a43e0 | 882 | preserve_values (struct objfile *objfile) |
c906108c | 883 | { |
ae5a43e0 DJ |
884 | htab_t copied_types; |
885 | struct value_history_chunk *cur; | |
52f0bd74 | 886 | struct internalvar *var; |
ae5a43e0 | 887 | int i; |
c906108c | 888 | |
ae5a43e0 DJ |
889 | /* Create the hash table. We allocate on the objfile's obstack, since |
890 | it is soon to be deleted. */ | |
891 | copied_types = create_copied_types_hash (objfile); | |
892 | ||
893 | for (cur = value_history_chain; cur; cur = cur->next) | |
894 | for (i = 0; i < VALUE_HISTORY_CHUNK; i++) | |
895 | if (cur->values[i]) | |
896 | preserve_one_value (cur->values[i], objfile, copied_types); | |
897 | ||
898 | for (var = internalvars; var; var = var->next) | |
899 | preserve_one_value (var->value, objfile, copied_types); | |
900 | ||
901 | htab_delete (copied_types); | |
c906108c SS |
902 | } |
903 | ||
904 | static void | |
fba45db2 | 905 | show_convenience (char *ignore, int from_tty) |
c906108c | 906 | { |
52f0bd74 | 907 | struct internalvar *var; |
c906108c SS |
908 | int varseen = 0; |
909 | ||
910 | for (var = internalvars; var; var = var->next) | |
911 | { | |
c906108c SS |
912 | if (!varseen) |
913 | { | |
914 | varseen = 1; | |
915 | } | |
a3f17187 | 916 | printf_filtered (("$%s = "), var->name); |
d3c139e9 AS |
917 | value_print (value_of_internalvar (var), gdb_stdout, |
918 | 0, Val_pretty_default); | |
a3f17187 | 919 | printf_filtered (("\n")); |
c906108c SS |
920 | } |
921 | if (!varseen) | |
a3f17187 AC |
922 | printf_unfiltered (_("\ |
923 | No debugger convenience variables now defined.\n\ | |
c906108c | 924 | Convenience variables have names starting with \"$\";\n\ |
a3f17187 | 925 | use \"set\" as in \"set $foo = 5\" to define them.\n")); |
c906108c SS |
926 | } |
927 | \f | |
928 | /* Extract a value as a C number (either long or double). | |
929 | Knows how to convert fixed values to double, or | |
930 | floating values to long. | |
931 | Does not deallocate the value. */ | |
932 | ||
933 | LONGEST | |
f23631e4 | 934 | value_as_long (struct value *val) |
c906108c SS |
935 | { |
936 | /* This coerces arrays and functions, which is necessary (e.g. | |
937 | in disassemble_command). It also dereferences references, which | |
938 | I suspect is the most logical thing to do. */ | |
994b9211 | 939 | val = coerce_array (val); |
0fd88904 | 940 | return unpack_long (value_type (val), value_contents (val)); |
c906108c SS |
941 | } |
942 | ||
943 | DOUBLEST | |
f23631e4 | 944 | value_as_double (struct value *val) |
c906108c SS |
945 | { |
946 | DOUBLEST foo; | |
947 | int inv; | |
c5aa993b | 948 | |
0fd88904 | 949 | foo = unpack_double (value_type (val), value_contents (val), &inv); |
c906108c | 950 | if (inv) |
8a3fe4f8 | 951 | error (_("Invalid floating value found in program.")); |
c906108c SS |
952 | return foo; |
953 | } | |
4478b372 JB |
954 | /* Extract a value as a C pointer. Does not deallocate the value. |
955 | Note that val's type may not actually be a pointer; value_as_long | |
956 | handles all the cases. */ | |
c906108c | 957 | CORE_ADDR |
f23631e4 | 958 | value_as_address (struct value *val) |
c906108c SS |
959 | { |
960 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
961 | whether we want this to be true eventually. */ | |
962 | #if 0 | |
bf6ae464 | 963 | /* gdbarch_addr_bits_remove is wrong if we are being called for a |
c906108c SS |
964 | non-address (e.g. argument to "signal", "info break", etc.), or |
965 | for pointers to char, in which the low bits *are* significant. */ | |
bf6ae464 | 966 | return gdbarch_addr_bits_remove (current_gdbarch, value_as_long (val)); |
c906108c | 967 | #else |
f312f057 JB |
968 | |
969 | /* There are several targets (IA-64, PowerPC, and others) which | |
970 | don't represent pointers to functions as simply the address of | |
971 | the function's entry point. For example, on the IA-64, a | |
972 | function pointer points to a two-word descriptor, generated by | |
973 | the linker, which contains the function's entry point, and the | |
974 | value the IA-64 "global pointer" register should have --- to | |
975 | support position-independent code. The linker generates | |
976 | descriptors only for those functions whose addresses are taken. | |
977 | ||
978 | On such targets, it's difficult for GDB to convert an arbitrary | |
979 | function address into a function pointer; it has to either find | |
980 | an existing descriptor for that function, or call malloc and | |
981 | build its own. On some targets, it is impossible for GDB to | |
982 | build a descriptor at all: the descriptor must contain a jump | |
983 | instruction; data memory cannot be executed; and code memory | |
984 | cannot be modified. | |
985 | ||
986 | Upon entry to this function, if VAL is a value of type `function' | |
987 | (that is, TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FUNC), then | |
988 | VALUE_ADDRESS (val) is the address of the function. This is what | |
989 | you'll get if you evaluate an expression like `main'. The call | |
990 | to COERCE_ARRAY below actually does all the usual unary | |
991 | conversions, which includes converting values of type `function' | |
992 | to `pointer to function'. This is the challenging conversion | |
993 | discussed above. Then, `unpack_long' will convert that pointer | |
994 | back into an address. | |
995 | ||
996 | So, suppose the user types `disassemble foo' on an architecture | |
997 | with a strange function pointer representation, on which GDB | |
998 | cannot build its own descriptors, and suppose further that `foo' | |
999 | has no linker-built descriptor. The address->pointer conversion | |
1000 | will signal an error and prevent the command from running, even | |
1001 | though the next step would have been to convert the pointer | |
1002 | directly back into the same address. | |
1003 | ||
1004 | The following shortcut avoids this whole mess. If VAL is a | |
1005 | function, just return its address directly. */ | |
df407dfe AC |
1006 | if (TYPE_CODE (value_type (val)) == TYPE_CODE_FUNC |
1007 | || TYPE_CODE (value_type (val)) == TYPE_CODE_METHOD) | |
f312f057 JB |
1008 | return VALUE_ADDRESS (val); |
1009 | ||
994b9211 | 1010 | val = coerce_array (val); |
fc0c74b1 AC |
1011 | |
1012 | /* Some architectures (e.g. Harvard), map instruction and data | |
1013 | addresses onto a single large unified address space. For | |
1014 | instance: An architecture may consider a large integer in the | |
1015 | range 0x10000000 .. 0x1000ffff to already represent a data | |
1016 | addresses (hence not need a pointer to address conversion) while | |
1017 | a small integer would still need to be converted integer to | |
1018 | pointer to address. Just assume such architectures handle all | |
1019 | integer conversions in a single function. */ | |
1020 | ||
1021 | /* JimB writes: | |
1022 | ||
1023 | I think INTEGER_TO_ADDRESS is a good idea as proposed --- but we | |
1024 | must admonish GDB hackers to make sure its behavior matches the | |
1025 | compiler's, whenever possible. | |
1026 | ||
1027 | In general, I think GDB should evaluate expressions the same way | |
1028 | the compiler does. When the user copies an expression out of | |
1029 | their source code and hands it to a `print' command, they should | |
1030 | get the same value the compiler would have computed. Any | |
1031 | deviation from this rule can cause major confusion and annoyance, | |
1032 | and needs to be justified carefully. In other words, GDB doesn't | |
1033 | really have the freedom to do these conversions in clever and | |
1034 | useful ways. | |
1035 | ||
1036 | AndrewC pointed out that users aren't complaining about how GDB | |
1037 | casts integers to pointers; they are complaining that they can't | |
1038 | take an address from a disassembly listing and give it to `x/i'. | |
1039 | This is certainly important. | |
1040 | ||
79dd2d24 | 1041 | Adding an architecture method like integer_to_address() certainly |
fc0c74b1 AC |
1042 | makes it possible for GDB to "get it right" in all circumstances |
1043 | --- the target has complete control over how things get done, so | |
1044 | people can Do The Right Thing for their target without breaking | |
1045 | anyone else. The standard doesn't specify how integers get | |
1046 | converted to pointers; usually, the ABI doesn't either, but | |
1047 | ABI-specific code is a more reasonable place to handle it. */ | |
1048 | ||
df407dfe AC |
1049 | if (TYPE_CODE (value_type (val)) != TYPE_CODE_PTR |
1050 | && TYPE_CODE (value_type (val)) != TYPE_CODE_REF | |
79dd2d24 AC |
1051 | && gdbarch_integer_to_address_p (current_gdbarch)) |
1052 | return gdbarch_integer_to_address (current_gdbarch, value_type (val), | |
0fd88904 | 1053 | value_contents (val)); |
fc0c74b1 | 1054 | |
0fd88904 | 1055 | return unpack_long (value_type (val), value_contents (val)); |
c906108c SS |
1056 | #endif |
1057 | } | |
1058 | \f | |
1059 | /* Unpack raw data (copied from debugee, target byte order) at VALADDR | |
1060 | as a long, or as a double, assuming the raw data is described | |
1061 | by type TYPE. Knows how to convert different sizes of values | |
1062 | and can convert between fixed and floating point. We don't assume | |
1063 | any alignment for the raw data. Return value is in host byte order. | |
1064 | ||
1065 | If you want functions and arrays to be coerced to pointers, and | |
1066 | references to be dereferenced, call value_as_long() instead. | |
1067 | ||
1068 | C++: It is assumed that the front-end has taken care of | |
1069 | all matters concerning pointers to members. A pointer | |
1070 | to member which reaches here is considered to be equivalent | |
1071 | to an INT (or some size). After all, it is only an offset. */ | |
1072 | ||
1073 | LONGEST | |
fc1a4b47 | 1074 | unpack_long (struct type *type, const gdb_byte *valaddr) |
c906108c | 1075 | { |
52f0bd74 AC |
1076 | enum type_code code = TYPE_CODE (type); |
1077 | int len = TYPE_LENGTH (type); | |
1078 | int nosign = TYPE_UNSIGNED (type); | |
c906108c | 1079 | |
c906108c SS |
1080 | switch (code) |
1081 | { | |
1082 | case TYPE_CODE_TYPEDEF: | |
1083 | return unpack_long (check_typedef (type), valaddr); | |
1084 | case TYPE_CODE_ENUM: | |
4f2aea11 | 1085 | case TYPE_CODE_FLAGS: |
c906108c SS |
1086 | case TYPE_CODE_BOOL: |
1087 | case TYPE_CODE_INT: | |
1088 | case TYPE_CODE_CHAR: | |
1089 | case TYPE_CODE_RANGE: | |
0d5de010 | 1090 | case TYPE_CODE_MEMBERPTR: |
c906108c SS |
1091 | if (nosign) |
1092 | return extract_unsigned_integer (valaddr, len); | |
1093 | else | |
1094 | return extract_signed_integer (valaddr, len); | |
1095 | ||
1096 | case TYPE_CODE_FLT: | |
96d2f608 | 1097 | return extract_typed_floating (valaddr, type); |
c906108c SS |
1098 | |
1099 | case TYPE_CODE_PTR: | |
1100 | case TYPE_CODE_REF: | |
1101 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
c5aa993b | 1102 | whether we want this to be true eventually. */ |
4478b372 | 1103 | return extract_typed_address (valaddr, type); |
c906108c | 1104 | |
c906108c | 1105 | default: |
8a3fe4f8 | 1106 | error (_("Value can't be converted to integer.")); |
c906108c | 1107 | } |
c5aa993b | 1108 | return 0; /* Placate lint. */ |
c906108c SS |
1109 | } |
1110 | ||
1111 | /* Return a double value from the specified type and address. | |
1112 | INVP points to an int which is set to 0 for valid value, | |
1113 | 1 for invalid value (bad float format). In either case, | |
1114 | the returned double is OK to use. Argument is in target | |
1115 | format, result is in host format. */ | |
1116 | ||
1117 | DOUBLEST | |
fc1a4b47 | 1118 | unpack_double (struct type *type, const gdb_byte *valaddr, int *invp) |
c906108c SS |
1119 | { |
1120 | enum type_code code; | |
1121 | int len; | |
1122 | int nosign; | |
1123 | ||
1124 | *invp = 0; /* Assume valid. */ | |
1125 | CHECK_TYPEDEF (type); | |
1126 | code = TYPE_CODE (type); | |
1127 | len = TYPE_LENGTH (type); | |
1128 | nosign = TYPE_UNSIGNED (type); | |
1129 | if (code == TYPE_CODE_FLT) | |
1130 | { | |
75bc7ddf AC |
1131 | /* NOTE: cagney/2002-02-19: There was a test here to see if the |
1132 | floating-point value was valid (using the macro | |
1133 | INVALID_FLOAT). That test/macro have been removed. | |
1134 | ||
1135 | It turns out that only the VAX defined this macro and then | |
1136 | only in a non-portable way. Fixing the portability problem | |
1137 | wouldn't help since the VAX floating-point code is also badly | |
1138 | bit-rotten. The target needs to add definitions for the | |
ea06eb3d | 1139 | methods gdbarch_float_format and gdbarch_double_format - these |
75bc7ddf AC |
1140 | exactly describe the target floating-point format. The |
1141 | problem here is that the corresponding floatformat_vax_f and | |
1142 | floatformat_vax_d values these methods should be set to are | |
1143 | also not defined either. Oops! | |
1144 | ||
1145 | Hopefully someone will add both the missing floatformat | |
ac79b88b DJ |
1146 | definitions and the new cases for floatformat_is_valid (). */ |
1147 | ||
1148 | if (!floatformat_is_valid (floatformat_from_type (type), valaddr)) | |
1149 | { | |
1150 | *invp = 1; | |
1151 | return 0.0; | |
1152 | } | |
1153 | ||
96d2f608 | 1154 | return extract_typed_floating (valaddr, type); |
c906108c SS |
1155 | } |
1156 | else if (nosign) | |
1157 | { | |
1158 | /* Unsigned -- be sure we compensate for signed LONGEST. */ | |
c906108c | 1159 | return (ULONGEST) unpack_long (type, valaddr); |
c906108c SS |
1160 | } |
1161 | else | |
1162 | { | |
1163 | /* Signed -- we are OK with unpack_long. */ | |
1164 | return unpack_long (type, valaddr); | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | /* Unpack raw data (copied from debugee, target byte order) at VALADDR | |
1169 | as a CORE_ADDR, assuming the raw data is described by type TYPE. | |
1170 | We don't assume any alignment for the raw data. Return value is in | |
1171 | host byte order. | |
1172 | ||
1173 | If you want functions and arrays to be coerced to pointers, and | |
1aa20aa8 | 1174 | references to be dereferenced, call value_as_address() instead. |
c906108c SS |
1175 | |
1176 | C++: It is assumed that the front-end has taken care of | |
1177 | all matters concerning pointers to members. A pointer | |
1178 | to member which reaches here is considered to be equivalent | |
1179 | to an INT (or some size). After all, it is only an offset. */ | |
1180 | ||
1181 | CORE_ADDR | |
fc1a4b47 | 1182 | unpack_pointer (struct type *type, const gdb_byte *valaddr) |
c906108c SS |
1183 | { |
1184 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
1185 | whether we want this to be true eventually. */ | |
1186 | return unpack_long (type, valaddr); | |
1187 | } | |
4478b372 | 1188 | |
c906108c | 1189 | \f |
2c2738a0 DC |
1190 | /* Get the value of the FIELDN'th field (which must be static) of |
1191 | TYPE. Return NULL if the field doesn't exist or has been | |
1192 | optimized out. */ | |
c906108c | 1193 | |
f23631e4 | 1194 | struct value * |
fba45db2 | 1195 | value_static_field (struct type *type, int fieldno) |
c906108c | 1196 | { |
948e66d9 DJ |
1197 | struct value *retval; |
1198 | ||
c906108c SS |
1199 | if (TYPE_FIELD_STATIC_HAS_ADDR (type, fieldno)) |
1200 | { | |
948e66d9 | 1201 | retval = value_at (TYPE_FIELD_TYPE (type, fieldno), |
00a4c844 | 1202 | TYPE_FIELD_STATIC_PHYSADDR (type, fieldno)); |
c906108c SS |
1203 | } |
1204 | else | |
1205 | { | |
1206 | char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno); | |
176620f1 | 1207 | struct symbol *sym = lookup_symbol (phys_name, 0, VAR_DOMAIN, 0, NULL); |
948e66d9 | 1208 | if (sym == NULL) |
c906108c SS |
1209 | { |
1210 | /* With some compilers, e.g. HP aCC, static data members are reported | |
c5aa993b JM |
1211 | as non-debuggable symbols */ |
1212 | struct minimal_symbol *msym = lookup_minimal_symbol (phys_name, NULL, NULL); | |
c906108c SS |
1213 | if (!msym) |
1214 | return NULL; | |
1215 | else | |
c5aa993b | 1216 | { |
948e66d9 | 1217 | retval = value_at (TYPE_FIELD_TYPE (type, fieldno), |
00a4c844 | 1218 | SYMBOL_VALUE_ADDRESS (msym)); |
c906108c SS |
1219 | } |
1220 | } | |
1221 | else | |
1222 | { | |
948e66d9 DJ |
1223 | /* SYM should never have a SYMBOL_CLASS which will require |
1224 | read_var_value to use the FRAME parameter. */ | |
1225 | if (symbol_read_needs_frame (sym)) | |
8a3fe4f8 AC |
1226 | warning (_("static field's value depends on the current " |
1227 | "frame - bad debug info?")); | |
948e66d9 | 1228 | retval = read_var_value (sym, NULL); |
2b127877 | 1229 | } |
948e66d9 DJ |
1230 | if (retval && VALUE_LVAL (retval) == lval_memory) |
1231 | SET_FIELD_PHYSADDR (TYPE_FIELD (type, fieldno), | |
1232 | VALUE_ADDRESS (retval)); | |
c906108c | 1233 | } |
948e66d9 | 1234 | return retval; |
c906108c SS |
1235 | } |
1236 | ||
2b127877 DB |
1237 | /* Change the enclosing type of a value object VAL to NEW_ENCL_TYPE. |
1238 | You have to be careful here, since the size of the data area for the value | |
1239 | is set by the length of the enclosing type. So if NEW_ENCL_TYPE is bigger | |
1240 | than the old enclosing type, you have to allocate more space for the data. | |
1241 | The return value is a pointer to the new version of this value structure. */ | |
1242 | ||
f23631e4 AC |
1243 | struct value * |
1244 | value_change_enclosing_type (struct value *val, struct type *new_encl_type) | |
2b127877 | 1245 | { |
4754a64e | 1246 | if (TYPE_LENGTH (new_encl_type) <= TYPE_LENGTH (value_enclosing_type (val))) |
2b127877 | 1247 | { |
4754a64e | 1248 | val->enclosing_type = new_encl_type; |
2b127877 DB |
1249 | return val; |
1250 | } | |
1251 | else | |
1252 | { | |
f23631e4 AC |
1253 | struct value *new_val; |
1254 | struct value *prev; | |
2b127877 | 1255 | |
f23631e4 | 1256 | new_val = (struct value *) xrealloc (val, sizeof (struct value) + TYPE_LENGTH (new_encl_type)); |
cc303028 | 1257 | |
4754a64e | 1258 | new_val->enclosing_type = new_encl_type; |
cc303028 | 1259 | |
2b127877 DB |
1260 | /* We have to make sure this ends up in the same place in the value |
1261 | chain as the original copy, so it's clean-up behavior is the same. | |
1262 | If the value has been released, this is a waste of time, but there | |
1263 | is no way to tell that in advance, so... */ | |
1264 | ||
1265 | if (val != all_values) | |
1266 | { | |
1267 | for (prev = all_values; prev != NULL; prev = prev->next) | |
1268 | { | |
1269 | if (prev->next == val) | |
1270 | { | |
1271 | prev->next = new_val; | |
1272 | break; | |
1273 | } | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | return new_val; | |
1278 | } | |
1279 | } | |
1280 | ||
c906108c SS |
1281 | /* Given a value ARG1 (offset by OFFSET bytes) |
1282 | of a struct or union type ARG_TYPE, | |
1283 | extract and return the value of one of its (non-static) fields. | |
1284 | FIELDNO says which field. */ | |
1285 | ||
f23631e4 AC |
1286 | struct value * |
1287 | value_primitive_field (struct value *arg1, int offset, | |
aa1ee363 | 1288 | int fieldno, struct type *arg_type) |
c906108c | 1289 | { |
f23631e4 | 1290 | struct value *v; |
52f0bd74 | 1291 | struct type *type; |
c906108c SS |
1292 | |
1293 | CHECK_TYPEDEF (arg_type); | |
1294 | type = TYPE_FIELD_TYPE (arg_type, fieldno); | |
1295 | ||
1296 | /* Handle packed fields */ | |
1297 | ||
1298 | if (TYPE_FIELD_BITSIZE (arg_type, fieldno)) | |
1299 | { | |
1300 | v = value_from_longest (type, | |
1301 | unpack_field_as_long (arg_type, | |
0fd88904 | 1302 | value_contents (arg1) |
c5aa993b | 1303 | + offset, |
c906108c | 1304 | fieldno)); |
df407dfe AC |
1305 | v->bitpos = TYPE_FIELD_BITPOS (arg_type, fieldno) % 8; |
1306 | v->bitsize = TYPE_FIELD_BITSIZE (arg_type, fieldno); | |
1307 | v->offset = value_offset (arg1) + offset | |
2e70b7b9 | 1308 | + TYPE_FIELD_BITPOS (arg_type, fieldno) / 8; |
c906108c SS |
1309 | } |
1310 | else if (fieldno < TYPE_N_BASECLASSES (arg_type)) | |
1311 | { | |
1312 | /* This field is actually a base subobject, so preserve the | |
1313 | entire object's contents for later references to virtual | |
1314 | bases, etc. */ | |
4754a64e | 1315 | v = allocate_value (value_enclosing_type (arg1)); |
df407dfe | 1316 | v->type = type; |
d69fe07e | 1317 | if (value_lazy (arg1)) |
dfa52d88 | 1318 | set_value_lazy (v, 1); |
c906108c | 1319 | else |
990a07ab | 1320 | memcpy (value_contents_all_raw (v), value_contents_all_raw (arg1), |
4754a64e | 1321 | TYPE_LENGTH (value_enclosing_type (arg1))); |
df407dfe | 1322 | v->offset = value_offset (arg1); |
13c3b5f5 AC |
1323 | v->embedded_offset = (offset + value_embedded_offset (arg1) |
1324 | + TYPE_FIELD_BITPOS (arg_type, fieldno) / 8); | |
c906108c SS |
1325 | } |
1326 | else | |
1327 | { | |
1328 | /* Plain old data member */ | |
1329 | offset += TYPE_FIELD_BITPOS (arg_type, fieldno) / 8; | |
1330 | v = allocate_value (type); | |
d69fe07e | 1331 | if (value_lazy (arg1)) |
dfa52d88 | 1332 | set_value_lazy (v, 1); |
c906108c | 1333 | else |
990a07ab AC |
1334 | memcpy (value_contents_raw (v), |
1335 | value_contents_raw (arg1) + offset, | |
c906108c | 1336 | TYPE_LENGTH (type)); |
df407dfe | 1337 | v->offset = (value_offset (arg1) + offset |
13c3b5f5 | 1338 | + value_embedded_offset (arg1)); |
c906108c SS |
1339 | } |
1340 | VALUE_LVAL (v) = VALUE_LVAL (arg1); | |
1341 | if (VALUE_LVAL (arg1) == lval_internalvar) | |
1342 | VALUE_LVAL (v) = lval_internalvar_component; | |
7d85ee02 | 1343 | v->location = arg1->location; |
9ee8fc9d | 1344 | VALUE_REGNUM (v) = VALUE_REGNUM (arg1); |
0c16dd26 | 1345 | VALUE_FRAME_ID (v) = VALUE_FRAME_ID (arg1); |
c906108c SS |
1346 | return v; |
1347 | } | |
1348 | ||
1349 | /* Given a value ARG1 of a struct or union type, | |
1350 | extract and return the value of one of its (non-static) fields. | |
1351 | FIELDNO says which field. */ | |
1352 | ||
f23631e4 | 1353 | struct value * |
aa1ee363 | 1354 | value_field (struct value *arg1, int fieldno) |
c906108c | 1355 | { |
df407dfe | 1356 | return value_primitive_field (arg1, 0, fieldno, value_type (arg1)); |
c906108c SS |
1357 | } |
1358 | ||
1359 | /* Return a non-virtual function as a value. | |
1360 | F is the list of member functions which contains the desired method. | |
0478d61c FF |
1361 | J is an index into F which provides the desired method. |
1362 | ||
1363 | We only use the symbol for its address, so be happy with either a | |
1364 | full symbol or a minimal symbol. | |
1365 | */ | |
c906108c | 1366 | |
f23631e4 AC |
1367 | struct value * |
1368 | value_fn_field (struct value **arg1p, struct fn_field *f, int j, struct type *type, | |
fba45db2 | 1369 | int offset) |
c906108c | 1370 | { |
f23631e4 | 1371 | struct value *v; |
52f0bd74 | 1372 | struct type *ftype = TYPE_FN_FIELD_TYPE (f, j); |
0478d61c | 1373 | char *physname = TYPE_FN_FIELD_PHYSNAME (f, j); |
c906108c | 1374 | struct symbol *sym; |
0478d61c | 1375 | struct minimal_symbol *msym; |
c906108c | 1376 | |
176620f1 | 1377 | sym = lookup_symbol (physname, 0, VAR_DOMAIN, 0, NULL); |
5ae326fa | 1378 | if (sym != NULL) |
0478d61c | 1379 | { |
5ae326fa AC |
1380 | msym = NULL; |
1381 | } | |
1382 | else | |
1383 | { | |
1384 | gdb_assert (sym == NULL); | |
0478d61c | 1385 | msym = lookup_minimal_symbol (physname, NULL, NULL); |
5ae326fa AC |
1386 | if (msym == NULL) |
1387 | return NULL; | |
0478d61c FF |
1388 | } |
1389 | ||
c906108c | 1390 | v = allocate_value (ftype); |
0478d61c FF |
1391 | if (sym) |
1392 | { | |
1393 | VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); | |
1394 | } | |
1395 | else | |
1396 | { | |
1397 | VALUE_ADDRESS (v) = SYMBOL_VALUE_ADDRESS (msym); | |
1398 | } | |
c906108c SS |
1399 | |
1400 | if (arg1p) | |
c5aa993b | 1401 | { |
df407dfe | 1402 | if (type != value_type (*arg1p)) |
c5aa993b JM |
1403 | *arg1p = value_ind (value_cast (lookup_pointer_type (type), |
1404 | value_addr (*arg1p))); | |
1405 | ||
070ad9f0 | 1406 | /* Move the `this' pointer according to the offset. |
c5aa993b JM |
1407 | VALUE_OFFSET (*arg1p) += offset; |
1408 | */ | |
c906108c SS |
1409 | } |
1410 | ||
1411 | return v; | |
1412 | } | |
1413 | ||
c906108c SS |
1414 | \f |
1415 | /* Unpack a field FIELDNO of the specified TYPE, from the anonymous object at | |
1416 | VALADDR. | |
1417 | ||
1418 | Extracting bits depends on endianness of the machine. Compute the | |
1419 | number of least significant bits to discard. For big endian machines, | |
1420 | we compute the total number of bits in the anonymous object, subtract | |
1421 | off the bit count from the MSB of the object to the MSB of the | |
1422 | bitfield, then the size of the bitfield, which leaves the LSB discard | |
1423 | count. For little endian machines, the discard count is simply the | |
1424 | number of bits from the LSB of the anonymous object to the LSB of the | |
1425 | bitfield. | |
1426 | ||
1427 | If the field is signed, we also do sign extension. */ | |
1428 | ||
1429 | LONGEST | |
fc1a4b47 | 1430 | unpack_field_as_long (struct type *type, const gdb_byte *valaddr, int fieldno) |
c906108c SS |
1431 | { |
1432 | ULONGEST val; | |
1433 | ULONGEST valmask; | |
1434 | int bitpos = TYPE_FIELD_BITPOS (type, fieldno); | |
1435 | int bitsize = TYPE_FIELD_BITSIZE (type, fieldno); | |
1436 | int lsbcount; | |
1437 | struct type *field_type; | |
1438 | ||
1439 | val = extract_unsigned_integer (valaddr + bitpos / 8, sizeof (val)); | |
1440 | field_type = TYPE_FIELD_TYPE (type, fieldno); | |
1441 | CHECK_TYPEDEF (field_type); | |
1442 | ||
1443 | /* Extract bits. See comment above. */ | |
1444 | ||
1445 | if (BITS_BIG_ENDIAN) | |
1446 | lsbcount = (sizeof val * 8 - bitpos % 8 - bitsize); | |
1447 | else | |
1448 | lsbcount = (bitpos % 8); | |
1449 | val >>= lsbcount; | |
1450 | ||
1451 | /* If the field does not entirely fill a LONGEST, then zero the sign bits. | |
1452 | If the field is signed, and is negative, then sign extend. */ | |
1453 | ||
1454 | if ((bitsize > 0) && (bitsize < 8 * (int) sizeof (val))) | |
1455 | { | |
1456 | valmask = (((ULONGEST) 1) << bitsize) - 1; | |
1457 | val &= valmask; | |
1458 | if (!TYPE_UNSIGNED (field_type)) | |
1459 | { | |
1460 | if (val & (valmask ^ (valmask >> 1))) | |
1461 | { | |
1462 | val |= ~valmask; | |
1463 | } | |
1464 | } | |
1465 | } | |
1466 | return (val); | |
1467 | } | |
1468 | ||
1469 | /* Modify the value of a bitfield. ADDR points to a block of memory in | |
1470 | target byte order; the bitfield starts in the byte pointed to. FIELDVAL | |
1471 | is the desired value of the field, in host byte order. BITPOS and BITSIZE | |
f4e88c8e PH |
1472 | indicate which bits (in target bit order) comprise the bitfield. |
1473 | Requires 0 < BITSIZE <= lbits, 0 <= BITPOS+BITSIZE <= lbits, and | |
1474 | 0 <= BITPOS, where lbits is the size of a LONGEST in bits. */ | |
c906108c SS |
1475 | |
1476 | void | |
fc1a4b47 | 1477 | modify_field (gdb_byte *addr, LONGEST fieldval, int bitpos, int bitsize) |
c906108c | 1478 | { |
f4e88c8e PH |
1479 | ULONGEST oword; |
1480 | ULONGEST mask = (ULONGEST) -1 >> (8 * sizeof (ULONGEST) - bitsize); | |
c906108c SS |
1481 | |
1482 | /* If a negative fieldval fits in the field in question, chop | |
1483 | off the sign extension bits. */ | |
f4e88c8e PH |
1484 | if ((~fieldval & ~(mask >> 1)) == 0) |
1485 | fieldval &= mask; | |
c906108c SS |
1486 | |
1487 | /* Warn if value is too big to fit in the field in question. */ | |
f4e88c8e | 1488 | if (0 != (fieldval & ~mask)) |
c906108c SS |
1489 | { |
1490 | /* FIXME: would like to include fieldval in the message, but | |
c5aa993b | 1491 | we don't have a sprintf_longest. */ |
8a3fe4f8 | 1492 | warning (_("Value does not fit in %d bits."), bitsize); |
c906108c SS |
1493 | |
1494 | /* Truncate it, otherwise adjoining fields may be corrupted. */ | |
f4e88c8e | 1495 | fieldval &= mask; |
c906108c SS |
1496 | } |
1497 | ||
f4e88c8e | 1498 | oword = extract_unsigned_integer (addr, sizeof oword); |
c906108c SS |
1499 | |
1500 | /* Shifting for bit field depends on endianness of the target machine. */ | |
1501 | if (BITS_BIG_ENDIAN) | |
1502 | bitpos = sizeof (oword) * 8 - bitpos - bitsize; | |
1503 | ||
f4e88c8e | 1504 | oword &= ~(mask << bitpos); |
c906108c SS |
1505 | oword |= fieldval << bitpos; |
1506 | ||
f4e88c8e | 1507 | store_unsigned_integer (addr, sizeof oword, oword); |
c906108c SS |
1508 | } |
1509 | \f | |
14d06750 | 1510 | /* Pack NUM into BUF using a target format of TYPE. */ |
c906108c | 1511 | |
14d06750 DJ |
1512 | void |
1513 | pack_long (gdb_byte *buf, struct type *type, LONGEST num) | |
c906108c | 1514 | { |
52f0bd74 | 1515 | int len; |
14d06750 DJ |
1516 | |
1517 | type = check_typedef (type); | |
c906108c SS |
1518 | len = TYPE_LENGTH (type); |
1519 | ||
14d06750 | 1520 | switch (TYPE_CODE (type)) |
c906108c | 1521 | { |
c906108c SS |
1522 | case TYPE_CODE_INT: |
1523 | case TYPE_CODE_CHAR: | |
1524 | case TYPE_CODE_ENUM: | |
4f2aea11 | 1525 | case TYPE_CODE_FLAGS: |
c906108c SS |
1526 | case TYPE_CODE_BOOL: |
1527 | case TYPE_CODE_RANGE: | |
0d5de010 | 1528 | case TYPE_CODE_MEMBERPTR: |
14d06750 | 1529 | store_signed_integer (buf, len, num); |
c906108c | 1530 | break; |
c5aa993b | 1531 | |
c906108c SS |
1532 | case TYPE_CODE_REF: |
1533 | case TYPE_CODE_PTR: | |
14d06750 | 1534 | store_typed_address (buf, type, (CORE_ADDR) num); |
c906108c | 1535 | break; |
c5aa993b | 1536 | |
c906108c | 1537 | default: |
14d06750 DJ |
1538 | error (_("Unexpected type (%d) encountered for integer constant."), |
1539 | TYPE_CODE (type)); | |
c906108c | 1540 | } |
14d06750 DJ |
1541 | } |
1542 | ||
1543 | ||
1544 | /* Convert C numbers into newly allocated values. */ | |
1545 | ||
1546 | struct value * | |
1547 | value_from_longest (struct type *type, LONGEST num) | |
1548 | { | |
1549 | struct value *val = allocate_value (type); | |
1550 | ||
1551 | pack_long (value_contents_raw (val), type, num); | |
1552 | ||
c906108c SS |
1553 | return val; |
1554 | } | |
1555 | ||
4478b372 JB |
1556 | |
1557 | /* Create a value representing a pointer of type TYPE to the address | |
1558 | ADDR. */ | |
f23631e4 | 1559 | struct value * |
4478b372 JB |
1560 | value_from_pointer (struct type *type, CORE_ADDR addr) |
1561 | { | |
f23631e4 | 1562 | struct value *val = allocate_value (type); |
990a07ab | 1563 | store_typed_address (value_contents_raw (val), type, addr); |
4478b372 JB |
1564 | return val; |
1565 | } | |
1566 | ||
1567 | ||
0f71a2f6 | 1568 | /* Create a value for a string constant to be stored locally |
070ad9f0 | 1569 | (not in the inferior's memory space, but in GDB memory). |
0f71a2f6 JM |
1570 | This is analogous to value_from_longest, which also does not |
1571 | use inferior memory. String shall NOT contain embedded nulls. */ | |
1572 | ||
f23631e4 | 1573 | struct value * |
fba45db2 | 1574 | value_from_string (char *ptr) |
0f71a2f6 | 1575 | { |
f23631e4 | 1576 | struct value *val; |
c5aa993b | 1577 | int len = strlen (ptr); |
0f71a2f6 | 1578 | int lowbound = current_language->string_lower_bound; |
f290d38e AC |
1579 | struct type *string_char_type; |
1580 | struct type *rangetype; | |
1581 | struct type *stringtype; | |
1582 | ||
1583 | rangetype = create_range_type ((struct type *) NULL, | |
1584 | builtin_type_int, | |
1585 | lowbound, len + lowbound - 1); | |
1586 | string_char_type = language_string_char_type (current_language, | |
1587 | current_gdbarch); | |
1588 | stringtype = create_array_type ((struct type *) NULL, | |
1589 | string_char_type, | |
1590 | rangetype); | |
0f71a2f6 | 1591 | val = allocate_value (stringtype); |
990a07ab | 1592 | memcpy (value_contents_raw (val), ptr, len); |
0f71a2f6 JM |
1593 | return val; |
1594 | } | |
1595 | ||
f23631e4 | 1596 | struct value * |
fba45db2 | 1597 | value_from_double (struct type *type, DOUBLEST num) |
c906108c | 1598 | { |
f23631e4 | 1599 | struct value *val = allocate_value (type); |
c906108c | 1600 | struct type *base_type = check_typedef (type); |
52f0bd74 AC |
1601 | enum type_code code = TYPE_CODE (base_type); |
1602 | int len = TYPE_LENGTH (base_type); | |
c906108c SS |
1603 | |
1604 | if (code == TYPE_CODE_FLT) | |
1605 | { | |
990a07ab | 1606 | store_typed_floating (value_contents_raw (val), base_type, num); |
c906108c SS |
1607 | } |
1608 | else | |
8a3fe4f8 | 1609 | error (_("Unexpected type encountered for floating constant.")); |
c906108c SS |
1610 | |
1611 | return val; | |
1612 | } | |
994b9211 AC |
1613 | |
1614 | struct value * | |
1615 | coerce_ref (struct value *arg) | |
1616 | { | |
df407dfe | 1617 | struct type *value_type_arg_tmp = check_typedef (value_type (arg)); |
994b9211 AC |
1618 | if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF) |
1619 | arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp), | |
df407dfe | 1620 | unpack_pointer (value_type (arg), |
0fd88904 | 1621 | value_contents (arg))); |
994b9211 AC |
1622 | return arg; |
1623 | } | |
1624 | ||
1625 | struct value * | |
1626 | coerce_array (struct value *arg) | |
1627 | { | |
1628 | arg = coerce_ref (arg); | |
1629 | if (current_language->c_style_arrays | |
df407dfe | 1630 | && TYPE_CODE (value_type (arg)) == TYPE_CODE_ARRAY) |
994b9211 | 1631 | arg = value_coerce_array (arg); |
df407dfe | 1632 | if (TYPE_CODE (value_type (arg)) == TYPE_CODE_FUNC) |
994b9211 AC |
1633 | arg = value_coerce_function (arg); |
1634 | return arg; | |
1635 | } | |
1636 | ||
1637 | struct value * | |
1638 | coerce_number (struct value *arg) | |
1639 | { | |
1640 | arg = coerce_array (arg); | |
1641 | arg = coerce_enum (arg); | |
1642 | return arg; | |
1643 | } | |
1644 | ||
1645 | struct value * | |
1646 | coerce_enum (struct value *arg) | |
1647 | { | |
df407dfe | 1648 | if (TYPE_CODE (check_typedef (value_type (arg))) == TYPE_CODE_ENUM) |
994b9211 AC |
1649 | arg = value_cast (builtin_type_unsigned_int, arg); |
1650 | return arg; | |
1651 | } | |
c906108c | 1652 | \f |
c906108c | 1653 | |
74055713 | 1654 | /* Should we use DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS instead of |
82d1552e | 1655 | gdbarch_extract_return_value? GCC_P is true if compiled with gcc and TYPE |
74055713 | 1656 | is the type (which is known to be struct, union or array). |
c906108c SS |
1657 | |
1658 | On most machines, the struct convention is used unless we are | |
1659 | using gcc and the type is of a special size. */ | |
1660 | /* As of about 31 Mar 93, GCC was changed to be compatible with the | |
1661 | native compiler. GCC 2.3.3 was the last release that did it the | |
1662 | old way. Since gcc2_compiled was not changed, we have no | |
1663 | way to correctly win in all cases, so we just do the right thing | |
1664 | for gcc1 and for gcc2 after this change. Thus it loses for gcc | |
1665 | 2.0-2.3.3. This is somewhat unfortunate, but changing gcc2_compiled | |
1666 | would cause more chaos than dealing with some struct returns being | |
1667 | handled wrong. */ | |
bc87dfa0 AC |
1668 | /* NOTE: cagney/2004-06-13: Deleted check for "gcc_p". GCC 1.x is |
1669 | dead. */ | |
c906108c SS |
1670 | |
1671 | int | |
fba45db2 | 1672 | generic_use_struct_convention (int gcc_p, struct type *value_type) |
c5aa993b | 1673 | { |
bc87dfa0 AC |
1674 | return !(TYPE_LENGTH (value_type) == 1 |
1675 | || TYPE_LENGTH (value_type) == 2 | |
1676 | || TYPE_LENGTH (value_type) == 4 | |
1677 | || TYPE_LENGTH (value_type) == 8); | |
c906108c SS |
1678 | } |
1679 | ||
48436ce6 AC |
1680 | /* Return true if the function returning the specified type is using |
1681 | the convention of returning structures in memory (passing in the | |
1682 | address as a hidden first parameter). GCC_P is nonzero if compiled | |
c906108c SS |
1683 | with GCC. */ |
1684 | ||
1685 | int | |
48436ce6 | 1686 | using_struct_return (struct type *value_type, int gcc_p) |
c906108c | 1687 | { |
52f0bd74 | 1688 | enum type_code code = TYPE_CODE (value_type); |
c906108c SS |
1689 | |
1690 | if (code == TYPE_CODE_ERROR) | |
8a3fe4f8 | 1691 | error (_("Function return type unknown.")); |
c906108c | 1692 | |
667e784f AC |
1693 | if (code == TYPE_CODE_VOID) |
1694 | /* A void return value is never in memory. See also corresponding | |
44e5158b | 1695 | code in "print_return_value". */ |
667e784f AC |
1696 | return 0; |
1697 | ||
92ad9cd9 AC |
1698 | /* Probe the architecture for the return-value convention. */ |
1699 | return (gdbarch_return_value (current_gdbarch, value_type, | |
1700 | NULL, NULL, NULL) | |
31db7b6c | 1701 | != RETURN_VALUE_REGISTER_CONVENTION); |
c906108c SS |
1702 | } |
1703 | ||
42be36b3 CT |
1704 | /* Set the initialized field in a value struct. */ |
1705 | ||
1706 | void | |
1707 | set_value_initialized (struct value *val, int status) | |
1708 | { | |
1709 | val->initialized = status; | |
1710 | } | |
1711 | ||
1712 | /* Return the initialized field in a value struct. */ | |
1713 | ||
1714 | int | |
1715 | value_initialized (struct value *val) | |
1716 | { | |
1717 | return val->initialized; | |
1718 | } | |
1719 | ||
c906108c | 1720 | void |
fba45db2 | 1721 | _initialize_values (void) |
c906108c | 1722 | { |
1a966eab AC |
1723 | add_cmd ("convenience", no_class, show_convenience, _("\ |
1724 | Debugger convenience (\"$foo\") variables.\n\ | |
c906108c | 1725 | These variables are created when you assign them values;\n\ |
1a966eab AC |
1726 | thus, \"print $foo=1\" gives \"$foo\" the value 1. Values may be any type.\n\ |
1727 | \n\ | |
c906108c SS |
1728 | A few convenience variables are given values automatically:\n\ |
1729 | \"$_\"holds the last address examined with \"x\" or \"info lines\",\n\ | |
1a966eab | 1730 | \"$__\" holds the contents of the last address examined with \"x\"."), |
c906108c SS |
1731 | &showlist); |
1732 | ||
1733 | add_cmd ("values", no_class, show_values, | |
1a966eab | 1734 | _("Elements of value history around item number IDX (or last ten)."), |
c906108c | 1735 | &showlist); |
53e5f3cf AS |
1736 | |
1737 | add_com ("init-if-undefined", class_vars, init_if_undefined_command, _("\ | |
1738 | Initialize a convenience variable if necessary.\n\ | |
1739 | init-if-undefined VARIABLE = EXPRESSION\n\ | |
1740 | Set an internal VARIABLE to the result of the EXPRESSION if it does not\n\ | |
1741 | exist or does not contain a value. The EXPRESSION is not evaluated if the\n\ | |
1742 | VARIABLE is already initialized.")); | |
c906108c | 1743 | } |