Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Find a variable's value in memory, for GDB, the GNU debugger. |
1bac305b AC |
2 | |
3 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
4 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003 Free Software | |
5 | 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 | |
11 | the Free Software Foundation; either version 2 of the License, or | |
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 JM |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
23 | |
24 | #include "defs.h" | |
25 | #include "symtab.h" | |
26 | #include "gdbtypes.h" | |
27 | #include "frame.h" | |
28 | #include "value.h" | |
29 | #include "gdbcore.h" | |
30 | #include "inferior.h" | |
31 | #include "target.h" | |
32 | #include "gdb_string.h" | |
14e534aa | 33 | #include "gdb_assert.h" |
c906108c | 34 | #include "floatformat.h" |
c5aa993b | 35 | #include "symfile.h" /* for overlay functions */ |
4e052eda | 36 | #include "regcache.h" |
0406ec40 | 37 | #include "builtin-regs.h" |
fe898f56 | 38 | #include "block.h" |
c906108c | 39 | |
c906108c SS |
40 | /* Basic byte-swapping routines. GDB has needed these for a long time... |
41 | All extract a target-format integer at ADDR which is LEN bytes long. */ | |
42 | ||
43 | #if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8 | |
44 | /* 8 bit characters are a pretty safe assumption these days, so we | |
45 | assume it throughout all these swapping routines. If we had to deal with | |
46 | 9 bit characters, we would need to make len be in bits and would have | |
47 | to re-write these routines... */ | |
c5aa993b | 48 | you lose |
c906108c SS |
49 | #endif |
50 | ||
a9ac8f51 | 51 | LONGEST |
37611a2b | 52 | extract_signed_integer (const void *addr, int len) |
c906108c SS |
53 | { |
54 | LONGEST retval; | |
37611a2b AC |
55 | const unsigned char *p; |
56 | const unsigned char *startaddr = addr; | |
57 | const unsigned char *endaddr = startaddr + len; | |
c906108c SS |
58 | |
59 | if (len > (int) sizeof (LONGEST)) | |
60 | error ("\ | |
61 | That operation is not available on integers of more than %d bytes.", | |
baa6f10b | 62 | (int) sizeof (LONGEST)); |
c906108c SS |
63 | |
64 | /* Start at the most significant end of the integer, and work towards | |
65 | the least significant. */ | |
d7449b42 | 66 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
c906108c SS |
67 | { |
68 | p = startaddr; | |
69 | /* Do the sign extension once at the start. */ | |
c5aa993b | 70 | retval = ((LONGEST) * p ^ 0x80) - 0x80; |
c906108c SS |
71 | for (++p; p < endaddr; ++p) |
72 | retval = (retval << 8) | *p; | |
73 | } | |
74 | else | |
75 | { | |
76 | p = endaddr - 1; | |
77 | /* Do the sign extension once at the start. */ | |
c5aa993b | 78 | retval = ((LONGEST) * p ^ 0x80) - 0x80; |
c906108c SS |
79 | for (--p; p >= startaddr; --p) |
80 | retval = (retval << 8) | *p; | |
81 | } | |
82 | return retval; | |
83 | } | |
84 | ||
85 | ULONGEST | |
37611a2b | 86 | extract_unsigned_integer (const void *addr, int len) |
c906108c SS |
87 | { |
88 | ULONGEST retval; | |
37611a2b AC |
89 | const unsigned char *p; |
90 | const unsigned char *startaddr = addr; | |
91 | const unsigned char *endaddr = startaddr + len; | |
c906108c SS |
92 | |
93 | if (len > (int) sizeof (ULONGEST)) | |
94 | error ("\ | |
95 | That operation is not available on integers of more than %d bytes.", | |
baa6f10b | 96 | (int) sizeof (ULONGEST)); |
c906108c SS |
97 | |
98 | /* Start at the most significant end of the integer, and work towards | |
99 | the least significant. */ | |
100 | retval = 0; | |
d7449b42 | 101 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
c906108c SS |
102 | { |
103 | for (p = startaddr; p < endaddr; ++p) | |
104 | retval = (retval << 8) | *p; | |
105 | } | |
106 | else | |
107 | { | |
108 | for (p = endaddr - 1; p >= startaddr; --p) | |
109 | retval = (retval << 8) | *p; | |
110 | } | |
111 | return retval; | |
112 | } | |
113 | ||
114 | /* Sometimes a long long unsigned integer can be extracted as a | |
115 | LONGEST value. This is done so that we can print these values | |
116 | better. If this integer can be converted to a LONGEST, this | |
117 | function returns 1 and sets *PVAL. Otherwise it returns 0. */ | |
118 | ||
119 | int | |
66140c26 | 120 | extract_long_unsigned_integer (const void *addr, int orig_len, LONGEST *pval) |
c906108c SS |
121 | { |
122 | char *p, *first_addr; | |
123 | int len; | |
124 | ||
125 | len = orig_len; | |
d7449b42 | 126 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
c906108c SS |
127 | { |
128 | for (p = (char *) addr; | |
129 | len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len; | |
130 | p++) | |
131 | { | |
132 | if (*p == 0) | |
133 | len--; | |
134 | else | |
135 | break; | |
136 | } | |
137 | first_addr = p; | |
138 | } | |
139 | else | |
140 | { | |
141 | first_addr = (char *) addr; | |
142 | for (p = (char *) addr + orig_len - 1; | |
143 | len > (int) sizeof (LONGEST) && p >= (char *) addr; | |
144 | p--) | |
145 | { | |
146 | if (*p == 0) | |
147 | len--; | |
148 | else | |
149 | break; | |
150 | } | |
151 | } | |
152 | ||
153 | if (len <= (int) sizeof (LONGEST)) | |
154 | { | |
155 | *pval = (LONGEST) extract_unsigned_integer (first_addr, | |
156 | sizeof (LONGEST)); | |
157 | return 1; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
4478b372 | 163 | |
4478b372 JB |
164 | /* Treat the bytes at BUF as a pointer of type TYPE, and return the |
165 | address it represents. */ | |
166 | CORE_ADDR | |
66140c26 | 167 | extract_typed_address (const void *buf, struct type *type) |
4478b372 JB |
168 | { |
169 | if (TYPE_CODE (type) != TYPE_CODE_PTR | |
170 | && TYPE_CODE (type) != TYPE_CODE_REF) | |
8e65ff28 AC |
171 | internal_error (__FILE__, __LINE__, |
172 | "extract_typed_address: " | |
4478b372 JB |
173 | "type is not a pointer or reference"); |
174 | ||
175 | return POINTER_TO_ADDRESS (type, buf); | |
176 | } | |
177 | ||
178 | ||
c906108c | 179 | void |
a9ac8f51 | 180 | store_signed_integer (void *addr, int len, LONGEST val) |
c906108c SS |
181 | { |
182 | unsigned char *p; | |
c5aa993b | 183 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
184 | unsigned char *endaddr = startaddr + len; |
185 | ||
186 | /* Start at the least significant end of the integer, and work towards | |
187 | the most significant. */ | |
d7449b42 | 188 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
c906108c SS |
189 | { |
190 | for (p = endaddr - 1; p >= startaddr; --p) | |
191 | { | |
192 | *p = val & 0xff; | |
193 | val >>= 8; | |
194 | } | |
195 | } | |
196 | else | |
197 | { | |
198 | for (p = startaddr; p < endaddr; ++p) | |
199 | { | |
200 | *p = val & 0xff; | |
201 | val >>= 8; | |
202 | } | |
203 | } | |
204 | } | |
205 | ||
206 | void | |
a9ac8f51 | 207 | store_unsigned_integer (void *addr, int len, ULONGEST val) |
c906108c SS |
208 | { |
209 | unsigned char *p; | |
c5aa993b | 210 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
211 | unsigned char *endaddr = startaddr + len; |
212 | ||
213 | /* Start at the least significant end of the integer, and work towards | |
214 | the most significant. */ | |
d7449b42 | 215 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
c906108c SS |
216 | { |
217 | for (p = endaddr - 1; p >= startaddr; --p) | |
218 | { | |
219 | *p = val & 0xff; | |
220 | val >>= 8; | |
221 | } | |
222 | } | |
223 | else | |
224 | { | |
225 | for (p = startaddr; p < endaddr; ++p) | |
226 | { | |
227 | *p = val & 0xff; | |
228 | val >>= 8; | |
229 | } | |
230 | } | |
231 | } | |
232 | ||
4478b372 JB |
233 | /* Store the address ADDR as a pointer of type TYPE at BUF, in target |
234 | form. */ | |
235 | void | |
236 | store_typed_address (void *buf, struct type *type, CORE_ADDR addr) | |
237 | { | |
238 | if (TYPE_CODE (type) != TYPE_CODE_PTR | |
239 | && TYPE_CODE (type) != TYPE_CODE_REF) | |
8e65ff28 AC |
240 | internal_error (__FILE__, __LINE__, |
241 | "store_typed_address: " | |
4478b372 JB |
242 | "type is not a pointer or reference"); |
243 | ||
244 | ADDRESS_TO_POINTER (type, buf, addr); | |
245 | } | |
246 | ||
247 | ||
248 | ||
376c9600 AC |
249 | /* Return a `value' with the contents of (virtual or cooked) register |
250 | REGNUM as found in the specified FRAME. The register's type is | |
7b83296f | 251 | determined by register_type(). |
c906108c | 252 | |
376c9600 AC |
253 | NOTE: returns NULL if register value is not available. Caller will |
254 | check return value or die! */ | |
c906108c | 255 | |
3d6d86c6 | 256 | struct value * |
376c9600 | 257 | value_of_register (int regnum, struct frame_info *frame) |
c906108c SS |
258 | { |
259 | CORE_ADDR addr; | |
260 | int optim; | |
3d6d86c6 | 261 | struct value *reg_val; |
ac2adee5 | 262 | int realnum; |
d9d9c31f | 263 | char raw_buffer[MAX_REGISTER_SIZE]; |
c906108c SS |
264 | enum lval_type lval; |
265 | ||
0406ec40 AC |
266 | /* Builtin registers lie completly outside of the range of normal |
267 | registers. Catch them early so that the target never sees them. */ | |
268 | if (regnum >= NUM_REGS + NUM_PSEUDO_REGS) | |
0a1e1ca1 | 269 | return value_of_builtin_reg (regnum, frame); |
0406ec40 | 270 | |
ac2adee5 | 271 | frame_register (frame, regnum, &optim, &lval, &addr, &realnum, raw_buffer); |
c906108c | 272 | |
c97dcfc7 AC |
273 | /* FIXME: cagney/2002-05-15: This test is just bogus. |
274 | ||
275 | It indicates that the target failed to supply a value for a | |
276 | register because it was "not available" at this time. Problem | |
277 | is, the target still has the register and so get saved_register() | |
278 | may be returning a value saved on the stack. */ | |
279 | ||
32178cab | 280 | if (register_cached (regnum) < 0) |
c5aa993b | 281 | return NULL; /* register value not available */ |
c906108c | 282 | |
7b83296f | 283 | reg_val = allocate_value (register_type (current_gdbarch, regnum)); |
c906108c SS |
284 | |
285 | /* Convert raw data to virtual format if necessary. */ | |
286 | ||
781a750d | 287 | if (DEPRECATED_REGISTER_CONVERTIBLE (regnum)) |
c906108c | 288 | { |
781a750d AC |
289 | DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum, register_type (current_gdbarch, regnum), |
290 | raw_buffer, VALUE_CONTENTS_RAW (reg_val)); | |
c906108c | 291 | } |
392a587b JM |
292 | else if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum)) |
293 | memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer, | |
294 | REGISTER_RAW_SIZE (regnum)); | |
c906108c | 295 | else |
8e65ff28 AC |
296 | internal_error (__FILE__, __LINE__, |
297 | "Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size", | |
96baa820 JM |
298 | REGISTER_NAME (regnum), |
299 | regnum, | |
300 | REGISTER_RAW_SIZE (regnum), | |
301 | REGISTER_VIRTUAL_SIZE (regnum)); | |
c906108c SS |
302 | VALUE_LVAL (reg_val) = lval; |
303 | VALUE_ADDRESS (reg_val) = addr; | |
304 | VALUE_REGNO (reg_val) = regnum; | |
305 | VALUE_OPTIMIZED_OUT (reg_val) = optim; | |
306 | return reg_val; | |
307 | } | |
4478b372 JB |
308 | |
309 | /* Given a pointer of type TYPE in target form in BUF, return the | |
310 | address it represents. */ | |
311 | CORE_ADDR | |
66140c26 | 312 | unsigned_pointer_to_address (struct type *type, const void *buf) |
4478b372 | 313 | { |
af1342ab | 314 | return extract_unsigned_integer (buf, TYPE_LENGTH (type)); |
4478b372 JB |
315 | } |
316 | ||
ac2e2ef7 | 317 | CORE_ADDR |
66140c26 | 318 | signed_pointer_to_address (struct type *type, const void *buf) |
ac2e2ef7 AC |
319 | { |
320 | return extract_signed_integer (buf, TYPE_LENGTH (type)); | |
321 | } | |
4478b372 JB |
322 | |
323 | /* Given an address, store it as a pointer of type TYPE in target | |
324 | format in BUF. */ | |
325 | void | |
ac2e2ef7 | 326 | unsigned_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr) |
4478b372 | 327 | { |
fbd9dcd3 | 328 | store_unsigned_integer (buf, TYPE_LENGTH (type), addr); |
4478b372 JB |
329 | } |
330 | ||
ac2e2ef7 AC |
331 | void |
332 | address_to_signed_pointer (struct type *type, void *buf, CORE_ADDR addr) | |
333 | { | |
334 | store_signed_integer (buf, TYPE_LENGTH (type), addr); | |
335 | } | |
c906108c SS |
336 | \f |
337 | /* Will calling read_var_value or locate_var_value on SYM end | |
338 | up caring what frame it is being evaluated relative to? SYM must | |
339 | be non-NULL. */ | |
340 | int | |
fba45db2 | 341 | symbol_read_needs_frame (struct symbol *sym) |
c906108c SS |
342 | { |
343 | switch (SYMBOL_CLASS (sym)) | |
344 | { | |
345 | /* All cases listed explicitly so that gcc -Wall will detect it if | |
c5aa993b | 346 | we failed to consider one. */ |
4c2df51b DJ |
347 | case LOC_COMPUTED: |
348 | case LOC_COMPUTED_ARG: | |
349 | { | |
350 | struct location_funcs *symfuncs = SYMBOL_LOCATION_FUNCS (sym); | |
351 | return (symfuncs->read_needs_frame) (sym); | |
352 | } | |
353 | break; | |
354 | ||
c906108c SS |
355 | case LOC_REGISTER: |
356 | case LOC_ARG: | |
357 | case LOC_REF_ARG: | |
358 | case LOC_REGPARM: | |
359 | case LOC_REGPARM_ADDR: | |
360 | case LOC_LOCAL: | |
361 | case LOC_LOCAL_ARG: | |
362 | case LOC_BASEREG: | |
363 | case LOC_BASEREG_ARG: | |
407caf07 | 364 | case LOC_HP_THREAD_LOCAL_STATIC: |
c906108c SS |
365 | return 1; |
366 | ||
367 | case LOC_UNDEF: | |
368 | case LOC_CONST: | |
369 | case LOC_STATIC: | |
370 | case LOC_INDIRECT: | |
371 | case LOC_TYPEDEF: | |
372 | ||
373 | case LOC_LABEL: | |
374 | /* Getting the address of a label can be done independently of the block, | |
c5aa993b JM |
375 | even if some *uses* of that address wouldn't work so well without |
376 | the right frame. */ | |
c906108c SS |
377 | |
378 | case LOC_BLOCK: | |
379 | case LOC_CONST_BYTES: | |
380 | case LOC_UNRESOLVED: | |
381 | case LOC_OPTIMIZED_OUT: | |
382 | return 0; | |
383 | } | |
384 | return 1; | |
385 | } | |
386 | ||
387 | /* Given a struct symbol for a variable, | |
388 | and a stack frame id, read the value of the variable | |
389 | and return a (pointer to a) struct value containing the value. | |
390 | If the variable cannot be found, return a zero pointer. | |
6e7f8b9c | 391 | If FRAME is NULL, use the deprecated_selected_frame. */ |
c906108c | 392 | |
3d6d86c6 | 393 | struct value * |
fba45db2 | 394 | read_var_value (register struct symbol *var, struct frame_info *frame) |
c906108c | 395 | { |
3d6d86c6 | 396 | register struct value *v; |
c906108c SS |
397 | struct type *type = SYMBOL_TYPE (var); |
398 | CORE_ADDR addr; | |
399 | register int len; | |
400 | ||
401 | v = allocate_value (type); | |
402 | VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */ | |
403 | VALUE_BFD_SECTION (v) = SYMBOL_BFD_SECTION (var); | |
404 | ||
405 | len = TYPE_LENGTH (type); | |
406 | ||
c5aa993b | 407 | if (frame == NULL) |
6e7f8b9c | 408 | frame = deprecated_selected_frame; |
c906108c SS |
409 | |
410 | switch (SYMBOL_CLASS (var)) | |
411 | { | |
412 | case LOC_CONST: | |
413 | /* Put the constant back in target format. */ | |
414 | store_signed_integer (VALUE_CONTENTS_RAW (v), len, | |
415 | (LONGEST) SYMBOL_VALUE (var)); | |
416 | VALUE_LVAL (v) = not_lval; | |
417 | return v; | |
418 | ||
419 | case LOC_LABEL: | |
420 | /* Put the constant back in target format. */ | |
421 | if (overlay_debugging) | |
4478b372 JB |
422 | { |
423 | CORE_ADDR addr | |
424 | = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), | |
425 | SYMBOL_BFD_SECTION (var)); | |
426 | store_typed_address (VALUE_CONTENTS_RAW (v), type, addr); | |
427 | } | |
c906108c | 428 | else |
4478b372 JB |
429 | store_typed_address (VALUE_CONTENTS_RAW (v), type, |
430 | SYMBOL_VALUE_ADDRESS (var)); | |
c906108c SS |
431 | VALUE_LVAL (v) = not_lval; |
432 | return v; | |
433 | ||
434 | case LOC_CONST_BYTES: | |
435 | { | |
436 | char *bytes_addr; | |
437 | bytes_addr = SYMBOL_VALUE_BYTES (var); | |
438 | memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len); | |
439 | VALUE_LVAL (v) = not_lval; | |
440 | return v; | |
441 | } | |
442 | ||
443 | case LOC_STATIC: | |
444 | if (overlay_debugging) | |
445 | addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), | |
446 | SYMBOL_BFD_SECTION (var)); | |
447 | else | |
448 | addr = SYMBOL_VALUE_ADDRESS (var); | |
449 | break; | |
450 | ||
451 | case LOC_INDIRECT: | |
f76febae AC |
452 | { |
453 | /* The import slot does not have a real address in it from the | |
454 | dynamic loader (dld.sl on HP-UX), if the target hasn't | |
455 | begun execution yet, so check for that. */ | |
456 | CORE_ADDR locaddr; | |
457 | struct value *loc; | |
458 | if (!target_has_execution) | |
459 | error ("\ | |
c906108c SS |
460 | Attempt to access variable defined in different shared object or load module when\n\ |
461 | addresses have not been bound by the dynamic loader. Try again when executable is running."); | |
c5aa993b | 462 | |
f76febae AC |
463 | locaddr = SYMBOL_VALUE_ADDRESS (var); |
464 | loc = value_at (lookup_pointer_type (type), locaddr, NULL); | |
1aa20aa8 | 465 | addr = value_as_address (loc); |
f76febae | 466 | } |
c906108c SS |
467 | |
468 | case LOC_ARG: | |
469 | if (frame == NULL) | |
470 | return 0; | |
da62e633 | 471 | addr = get_frame_args_address (frame); |
c906108c SS |
472 | if (!addr) |
473 | return 0; | |
474 | addr += SYMBOL_VALUE (var); | |
475 | break; | |
476 | ||
477 | case LOC_REF_ARG: | |
f76febae AC |
478 | { |
479 | struct value *ref; | |
480 | CORE_ADDR argref; | |
481 | if (frame == NULL) | |
482 | return 0; | |
da62e633 | 483 | argref = get_frame_args_address (frame); |
f76febae AC |
484 | if (!argref) |
485 | return 0; | |
486 | argref += SYMBOL_VALUE (var); | |
487 | ref = value_at (lookup_pointer_type (type), argref, NULL); | |
1aa20aa8 | 488 | addr = value_as_address (ref); |
f76febae AC |
489 | break; |
490 | } | |
c906108c SS |
491 | |
492 | case LOC_LOCAL: | |
493 | case LOC_LOCAL_ARG: | |
494 | if (frame == NULL) | |
495 | return 0; | |
da62e633 | 496 | addr = get_frame_locals_address (frame); |
c906108c SS |
497 | addr += SYMBOL_VALUE (var); |
498 | break; | |
499 | ||
500 | case LOC_BASEREG: | |
501 | case LOC_BASEREG_ARG: | |
407caf07 | 502 | case LOC_HP_THREAD_LOCAL_STATIC: |
c906108c | 503 | { |
3d6d86c6 | 504 | struct value *regval; |
c5aa993b | 505 | |
9ed10b08 ND |
506 | regval = value_from_register (lookup_pointer_type (type), |
507 | SYMBOL_BASEREG (var), frame); | |
508 | if (regval == NULL) | |
509 | error ("Value of base register not available."); | |
1aa20aa8 | 510 | addr = value_as_address (regval); |
c5aa993b JM |
511 | addr += SYMBOL_VALUE (var); |
512 | break; | |
c906108c | 513 | } |
c5aa993b | 514 | |
9d774e44 EZ |
515 | case LOC_THREAD_LOCAL_STATIC: |
516 | { | |
9d774e44 EZ |
517 | if (target_get_thread_local_address_p ()) |
518 | addr = target_get_thread_local_address (inferior_ptid, | |
519 | SYMBOL_OBJFILE (var), | |
520 | SYMBOL_VALUE_ADDRESS (var)); | |
521 | /* It wouldn't be wrong here to try a gdbarch method, too; | |
522 | finding TLS is an ABI-specific thing. But we don't do that | |
523 | yet. */ | |
524 | else | |
525 | error ("Cannot find thread-local variables on this target"); | |
526 | break; | |
527 | } | |
528 | ||
c906108c SS |
529 | case LOC_TYPEDEF: |
530 | error ("Cannot look up value of a typedef"); | |
531 | break; | |
532 | ||
533 | case LOC_BLOCK: | |
534 | if (overlay_debugging) | |
c5aa993b | 535 | VALUE_ADDRESS (v) = symbol_overlayed_address |
c906108c SS |
536 | (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_BFD_SECTION (var)); |
537 | else | |
538 | VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var)); | |
539 | return v; | |
540 | ||
541 | case LOC_REGISTER: | |
542 | case LOC_REGPARM: | |
543 | case LOC_REGPARM_ADDR: | |
544 | { | |
545 | struct block *b; | |
546 | int regno = SYMBOL_VALUE (var); | |
3d6d86c6 | 547 | struct value *regval; |
c906108c SS |
548 | |
549 | if (frame == NULL) | |
550 | return 0; | |
ae767bfb | 551 | b = get_frame_block (frame, 0); |
c906108c SS |
552 | |
553 | if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR) | |
554 | { | |
555 | regval = value_from_register (lookup_pointer_type (type), | |
c5aa993b | 556 | regno, |
c906108c SS |
557 | frame); |
558 | ||
559 | if (regval == NULL) | |
560 | error ("Value of register variable not available."); | |
561 | ||
1aa20aa8 | 562 | addr = value_as_address (regval); |
c906108c SS |
563 | VALUE_LVAL (v) = lval_memory; |
564 | } | |
565 | else | |
566 | { | |
567 | regval = value_from_register (type, regno, frame); | |
568 | ||
569 | if (regval == NULL) | |
570 | error ("Value of register variable not available."); | |
571 | return regval; | |
572 | } | |
573 | } | |
574 | break; | |
575 | ||
4c2df51b DJ |
576 | case LOC_COMPUTED: |
577 | case LOC_COMPUTED_ARG: | |
578 | { | |
579 | struct location_funcs *funcs = SYMBOL_LOCATION_FUNCS (var); | |
580 | ||
581 | if (frame == 0 && (funcs->read_needs_frame) (var)) | |
582 | return 0; | |
583 | return (funcs->read_variable) (var, frame); | |
584 | ||
585 | } | |
586 | break; | |
587 | ||
c906108c SS |
588 | case LOC_UNRESOLVED: |
589 | { | |
590 | struct minimal_symbol *msym; | |
591 | ||
22abf04a | 592 | msym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (var), NULL, NULL); |
c906108c SS |
593 | if (msym == NULL) |
594 | return 0; | |
595 | if (overlay_debugging) | |
596 | addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym), | |
597 | SYMBOL_BFD_SECTION (msym)); | |
598 | else | |
599 | addr = SYMBOL_VALUE_ADDRESS (msym); | |
600 | } | |
601 | break; | |
602 | ||
603 | case LOC_OPTIMIZED_OUT: | |
604 | VALUE_LVAL (v) = not_lval; | |
605 | VALUE_OPTIMIZED_OUT (v) = 1; | |
606 | return v; | |
607 | ||
608 | default: | |
609 | error ("Cannot look up value of a botched symbol."); | |
610 | break; | |
611 | } | |
612 | ||
613 | VALUE_ADDRESS (v) = addr; | |
614 | VALUE_LAZY (v) = 1; | |
615 | return v; | |
616 | } | |
617 | ||
618 | /* Return a value of type TYPE, stored in register REGNUM, in frame | |
0f2c5ba5 | 619 | FRAME. |
c906108c SS |
620 | |
621 | NOTE: returns NULL if register value is not available. | |
622 | Caller will check return value or die! */ | |
623 | ||
3d6d86c6 | 624 | struct value * |
fba45db2 | 625 | value_from_register (struct type *type, int regnum, struct frame_info *frame) |
c906108c | 626 | { |
d9d9c31f | 627 | char raw_buffer[MAX_REGISTER_SIZE]; |
c906108c SS |
628 | CORE_ADDR addr; |
629 | int optim; | |
3d6d86c6 | 630 | struct value *v = allocate_value (type); |
c906108c SS |
631 | char *value_bytes = 0; |
632 | int value_bytes_copied = 0; | |
633 | int num_storage_locs; | |
634 | enum lval_type lval; | |
635 | int len; | |
636 | ||
637 | CHECK_TYPEDEF (type); | |
638 | len = TYPE_LENGTH (type); | |
639 | ||
640 | VALUE_REGNO (v) = regnum; | |
641 | ||
642 | num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ? | |
643 | ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 : | |
644 | 1); | |
645 | ||
646 | if (num_storage_locs > 1 | |
fd2299bd AC |
647 | #if 0 |
648 | // OBSOLETE #ifdef GDB_TARGET_IS_H8500 | |
649 | // OBSOLETE || TYPE_CODE (type) == TYPE_CODE_PTR | |
650 | // OBSOLETE #endif | |
c906108c | 651 | #endif |
c5aa993b | 652 | ) |
c906108c SS |
653 | { |
654 | /* Value spread across multiple storage locations. */ | |
c5aa993b | 655 | |
c906108c SS |
656 | int local_regnum; |
657 | int mem_stor = 0, reg_stor = 0; | |
658 | int mem_tracking = 1; | |
659 | CORE_ADDR last_addr = 0; | |
660 | CORE_ADDR first_addr = 0; | |
661 | ||
d9d9c31f | 662 | value_bytes = (char *) alloca (len + MAX_REGISTER_SIZE); |
c906108c SS |
663 | |
664 | /* Copy all of the data out, whereever it may be. */ | |
665 | ||
fd2299bd AC |
666 | #if 0 |
667 | // OBSOLETE #ifdef GDB_TARGET_IS_H8500 | |
668 | // OBSOLETE /* This piece of hideosity is required because the H8500 treats registers | |
669 | // OBSOLETE differently depending upon whether they are used as pointers or not. As a | |
670 | // OBSOLETE pointer, a register needs to have a page register tacked onto the front. | |
671 | // OBSOLETE An alternate way to do this would be to have gcc output different register | |
672 | // OBSOLETE numbers for the pointer & non-pointer form of the register. But, it | |
673 | // OBSOLETE doesn't, so we're stuck with this. */ | |
674 | // OBSOLETE | |
675 | // OBSOLETE if (TYPE_CODE (type) == TYPE_CODE_PTR | |
676 | // OBSOLETE && len > 2) | |
677 | // OBSOLETE { | |
678 | // OBSOLETE int page_regnum; | |
679 | // OBSOLETE | |
680 | // OBSOLETE switch (regnum) | |
681 | // OBSOLETE { | |
682 | // OBSOLETE case R0_REGNUM: | |
683 | // OBSOLETE case R1_REGNUM: | |
684 | // OBSOLETE case R2_REGNUM: | |
685 | // OBSOLETE case R3_REGNUM: | |
686 | // OBSOLETE page_regnum = SEG_D_REGNUM; | |
687 | // OBSOLETE break; | |
688 | // OBSOLETE case R4_REGNUM: | |
689 | // OBSOLETE case R5_REGNUM: | |
690 | // OBSOLETE page_regnum = SEG_E_REGNUM; | |
691 | // OBSOLETE break; | |
692 | // OBSOLETE case R6_REGNUM: | |
693 | // OBSOLETE case R7_REGNUM: | |
694 | // OBSOLETE page_regnum = SEG_T_REGNUM; | |
695 | // OBSOLETE break; | |
696 | // OBSOLETE } | |
697 | // OBSOLETE | |
698 | // OBSOLETE value_bytes[0] = 0; | |
699 | // OBSOLETE get_saved_register (value_bytes + 1, | |
700 | // OBSOLETE &optim, | |
701 | // OBSOLETE &addr, | |
702 | // OBSOLETE frame, | |
703 | // OBSOLETE page_regnum, | |
704 | // OBSOLETE &lval); | |
705 | // OBSOLETE | |
706 | // OBSOLETE if (register_cached (page_regnum) == -1) | |
707 | // OBSOLETE return NULL; /* register value not available */ | |
708 | // OBSOLETE | |
709 | // OBSOLETE if (lval == lval_register) | |
710 | // OBSOLETE reg_stor++; | |
711 | // OBSOLETE else | |
712 | // OBSOLETE mem_stor++; | |
713 | // OBSOLETE first_addr = addr; | |
714 | // OBSOLETE last_addr = addr; | |
715 | // OBSOLETE | |
716 | // OBSOLETE get_saved_register (value_bytes + 2, | |
717 | // OBSOLETE &optim, | |
718 | // OBSOLETE &addr, | |
719 | // OBSOLETE frame, | |
720 | // OBSOLETE regnum, | |
721 | // OBSOLETE &lval); | |
722 | // OBSOLETE | |
723 | // OBSOLETE if (register_cached (regnum) == -1) | |
724 | // OBSOLETE return NULL; /* register value not available */ | |
725 | // OBSOLETE | |
726 | // OBSOLETE if (lval == lval_register) | |
727 | // OBSOLETE reg_stor++; | |
728 | // OBSOLETE else | |
729 | // OBSOLETE { | |
730 | // OBSOLETE mem_stor++; | |
731 | // OBSOLETE mem_tracking = mem_tracking && (addr == last_addr); | |
732 | // OBSOLETE } | |
733 | // OBSOLETE last_addr = addr; | |
734 | // OBSOLETE } | |
735 | // OBSOLETE else | |
736 | // OBSOLETE #endif /* GDB_TARGET_IS_H8500 */ | |
737 | #endif | |
c906108c SS |
738 | for (local_regnum = regnum; |
739 | value_bytes_copied < len; | |
740 | (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum), | |
741 | ++local_regnum)) | |
742 | { | |
ac2adee5 AC |
743 | int realnum; |
744 | frame_register (frame, local_regnum, &optim, &lval, &addr, | |
745 | &realnum, value_bytes + value_bytes_copied); | |
c906108c | 746 | |
32178cab | 747 | if (register_cached (local_regnum) == -1) |
c5aa993b | 748 | return NULL; /* register value not available */ |
c906108c SS |
749 | |
750 | if (regnum == local_regnum) | |
751 | first_addr = addr; | |
752 | if (lval == lval_register) | |
753 | reg_stor++; | |
754 | else | |
755 | { | |
756 | mem_stor++; | |
c5aa993b | 757 | |
c906108c SS |
758 | mem_tracking = |
759 | (mem_tracking | |
760 | && (regnum == local_regnum | |
761 | || addr == last_addr)); | |
762 | } | |
763 | last_addr = addr; | |
764 | } | |
765 | ||
766 | if ((reg_stor && mem_stor) | |
767 | || (mem_stor && !mem_tracking)) | |
768 | /* Mixed storage; all of the hassle we just went through was | |
769 | for some good purpose. */ | |
770 | { | |
771 | VALUE_LVAL (v) = lval_reg_frame_relative; | |
1df6926e | 772 | VALUE_FRAME_ID (v) = get_frame_id (frame); |
c906108c SS |
773 | VALUE_FRAME_REGNUM (v) = regnum; |
774 | } | |
775 | else if (mem_stor) | |
776 | { | |
777 | VALUE_LVAL (v) = lval_memory; | |
778 | VALUE_ADDRESS (v) = first_addr; | |
779 | } | |
780 | else if (reg_stor) | |
781 | { | |
782 | VALUE_LVAL (v) = lval_register; | |
783 | VALUE_ADDRESS (v) = first_addr; | |
784 | } | |
785 | else | |
8e65ff28 AC |
786 | internal_error (__FILE__, __LINE__, |
787 | "value_from_register: Value not stored anywhere!"); | |
c906108c SS |
788 | |
789 | VALUE_OPTIMIZED_OUT (v) = optim; | |
790 | ||
791 | /* Any structure stored in more than one register will always be | |
c5aa993b JM |
792 | an integral number of registers. Otherwise, you'd need to do |
793 | some fiddling with the last register copied here for little | |
794 | endian machines. */ | |
c906108c SS |
795 | |
796 | /* Copy into the contents section of the value. */ | |
797 | memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len); | |
798 | ||
799 | /* Finally do any conversion necessary when extracting this | |
800 | type from more than one register. */ | |
801 | #ifdef REGISTER_CONVERT_TO_TYPE | |
c5aa993b | 802 | REGISTER_CONVERT_TO_TYPE (regnum, type, VALUE_CONTENTS_RAW (v)); |
c906108c SS |
803 | #endif |
804 | return v; | |
805 | } | |
806 | ||
807 | /* Data is completely contained within a single register. Locate the | |
808 | register's contents in a real register or in core; | |
809 | read the data in raw format. */ | |
810 | ||
ac2adee5 AC |
811 | { |
812 | int realnum; | |
813 | frame_register (frame, regnum, &optim, &lval, &addr, &realnum, raw_buffer); | |
814 | } | |
c906108c | 815 | |
32178cab | 816 | if (register_cached (regnum) == -1) |
c5aa993b | 817 | return NULL; /* register value not available */ |
c906108c SS |
818 | |
819 | VALUE_OPTIMIZED_OUT (v) = optim; | |
820 | VALUE_LVAL (v) = lval; | |
821 | VALUE_ADDRESS (v) = addr; | |
822 | ||
13d01224 AC |
823 | /* Convert the raw register to the corresponding data value's memory |
824 | format, if necessary. */ | |
c5aa993b | 825 | |
13d01224 | 826 | if (CONVERT_REGISTER_P (regnum)) |
c906108c | 827 | { |
13d01224 | 828 | REGISTER_TO_VALUE (regnum, type, raw_buffer, VALUE_CONTENTS_RAW (v)); |
c906108c SS |
829 | } |
830 | else | |
c906108c SS |
831 | { |
832 | /* Raw and virtual formats are the same for this register. */ | |
833 | ||
d7449b42 | 834 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG && len < REGISTER_RAW_SIZE (regnum)) |
c906108c | 835 | { |
c5aa993b | 836 | /* Big-endian, and we want less than full size. */ |
c906108c SS |
837 | VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len; |
838 | } | |
839 | ||
840 | memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len); | |
841 | } | |
c5aa993b | 842 | |
c906108c SS |
843 | return v; |
844 | } | |
845 | \f | |
846 | /* Given a struct symbol for a variable or function, | |
847 | and a stack frame id, | |
848 | return a (pointer to a) struct value containing the properly typed | |
849 | address. */ | |
850 | ||
3d6d86c6 | 851 | struct value * |
fba45db2 | 852 | locate_var_value (register struct symbol *var, struct frame_info *frame) |
c906108c SS |
853 | { |
854 | CORE_ADDR addr = 0; | |
855 | struct type *type = SYMBOL_TYPE (var); | |
3d6d86c6 | 856 | struct value *lazy_value; |
c906108c SS |
857 | |
858 | /* Evaluate it first; if the result is a memory address, we're fine. | |
859 | Lazy evaluation pays off here. */ | |
860 | ||
861 | lazy_value = read_var_value (var, frame); | |
862 | if (lazy_value == 0) | |
de5ad195 | 863 | error ("Address of \"%s\" is unknown.", SYMBOL_PRINT_NAME (var)); |
c906108c SS |
864 | |
865 | if (VALUE_LAZY (lazy_value) | |
866 | || TYPE_CODE (type) == TYPE_CODE_FUNC) | |
867 | { | |
3d6d86c6 | 868 | struct value *val; |
c906108c SS |
869 | |
870 | addr = VALUE_ADDRESS (lazy_value); | |
4478b372 | 871 | val = value_from_pointer (lookup_pointer_type (type), addr); |
c906108c SS |
872 | VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (lazy_value); |
873 | return val; | |
874 | } | |
875 | ||
876 | /* Not a memory address; check what the problem was. */ | |
c5aa993b | 877 | switch (VALUE_LVAL (lazy_value)) |
c906108c SS |
878 | { |
879 | case lval_register: | |
14e534aa PM |
880 | gdb_assert (REGISTER_NAME (VALUE_REGNO (lazy_value)) != NULL |
881 | && *REGISTER_NAME (VALUE_REGNO (lazy_value)) != '\0'); | |
882 | error("Address requested for identifier " | |
883 | "\"%s\" which is in register $%s", | |
de5ad195 | 884 | SYMBOL_PRINT_NAME (var), |
14e534aa PM |
885 | REGISTER_NAME (VALUE_REGNO (lazy_value))); |
886 | break; | |
887 | ||
c906108c | 888 | case lval_reg_frame_relative: |
14e534aa PM |
889 | gdb_assert (REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value)) != NULL |
890 | && *REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value)) != '\0'); | |
891 | error("Address requested for identifier " | |
892 | "\"%s\" which is in frame register $%s", | |
de5ad195 | 893 | SYMBOL_PRINT_NAME (var), |
14e534aa | 894 | REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value))); |
c906108c SS |
895 | break; |
896 | ||
897 | default: | |
898 | error ("Can't take address of \"%s\" which isn't an lvalue.", | |
de5ad195 | 899 | SYMBOL_PRINT_NAME (var)); |
c906108c SS |
900 | break; |
901 | } | |
c5aa993b | 902 | return 0; /* For lint -- never reached */ |
c906108c | 903 | } |