Commit | Line | Data |
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4c2df51b | 1 | /* DWARF 2 location expression support for GDB. |
feb13ab0 | 2 | |
7b6bb8da | 3 | Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010, 2011 |
4c38e0a4 | 4 | Free Software Foundation, Inc. |
feb13ab0 | 5 | |
4c2df51b DJ |
6 | Contributed by Daniel Jacobowitz, MontaVista Software, Inc. |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 JB |
12 | the Free Software Foundation; either version 3 of the License, or |
13 | (at your option) any later version. | |
4c2df51b | 14 | |
a9762ec7 JB |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
4c2df51b DJ |
19 | |
20 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
4c2df51b DJ |
22 | |
23 | #include "defs.h" | |
24 | #include "ui-out.h" | |
25 | #include "value.h" | |
26 | #include "frame.h" | |
27 | #include "gdbcore.h" | |
28 | #include "target.h" | |
29 | #include "inferior.h" | |
a55cc764 DJ |
30 | #include "ax.h" |
31 | #include "ax-gdb.h" | |
e4adbba9 | 32 | #include "regcache.h" |
c3228f12 | 33 | #include "objfiles.h" |
93ad78a7 | 34 | #include "exceptions.h" |
edb3359d | 35 | #include "block.h" |
4c2df51b | 36 | |
fa8f86ff | 37 | #include "dwarf2.h" |
4c2df51b DJ |
38 | #include "dwarf2expr.h" |
39 | #include "dwarf2loc.h" | |
e7802207 | 40 | #include "dwarf2-frame.h" |
4c2df51b DJ |
41 | |
42 | #include "gdb_string.h" | |
eff4f95e | 43 | #include "gdb_assert.h" |
4c2df51b | 44 | |
9eae7c52 TT |
45 | extern int dwarf2_always_disassemble; |
46 | ||
1632a688 JK |
47 | static void dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc, |
48 | const gdb_byte **start, size_t *length); | |
0936ad1d | 49 | |
1632a688 JK |
50 | static struct value *dwarf2_evaluate_loc_desc_full (struct type *type, |
51 | struct frame_info *frame, | |
52 | const gdb_byte *data, | |
53 | unsigned short size, | |
54 | struct dwarf2_per_cu_data *per_cu, | |
55 | LONGEST byte_offset); | |
8cf6f0b1 TT |
56 | |
57 | /* A function for dealing with location lists. Given a | |
0d53c4c4 DJ |
58 | symbol baton (BATON) and a pc value (PC), find the appropriate |
59 | location expression, set *LOCEXPR_LENGTH, and return a pointer | |
60 | to the beginning of the expression. Returns NULL on failure. | |
61 | ||
62 | For now, only return the first matching location expression; there | |
63 | can be more than one in the list. */ | |
64 | ||
8cf6f0b1 TT |
65 | const gdb_byte * |
66 | dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton, | |
67 | size_t *locexpr_length, CORE_ADDR pc) | |
0d53c4c4 | 68 | { |
0d53c4c4 | 69 | CORE_ADDR low, high; |
947bb88f | 70 | const gdb_byte *loc_ptr, *buf_end; |
852483bc | 71 | int length; |
ae0d2f24 | 72 | struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu); |
f7fd4728 | 73 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
e17a4113 | 74 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
ae0d2f24 | 75 | unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu); |
d4a087c7 | 76 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
0d53c4c4 | 77 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); |
8edfa926 | 78 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 79 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (baton->per_cu); |
8edfa926 | 80 | CORE_ADDR base_address = baton->base_address + base_offset; |
0d53c4c4 DJ |
81 | |
82 | loc_ptr = baton->data; | |
83 | buf_end = baton->data + baton->size; | |
84 | ||
85 | while (1) | |
86 | { | |
b5758fe4 | 87 | if (buf_end - loc_ptr < 2 * addr_size) |
3e43a32a MS |
88 | error (_("dwarf2_find_location_expression: " |
89 | "Corrupted DWARF expression.")); | |
0d53c4c4 | 90 | |
d4a087c7 UW |
91 | if (signed_addr_p) |
92 | low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
93 | else | |
94 | low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
95 | loc_ptr += addr_size; | |
96 | ||
97 | if (signed_addr_p) | |
98 | high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
99 | else | |
100 | high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
b5758fe4 | 101 | loc_ptr += addr_size; |
0d53c4c4 DJ |
102 | |
103 | /* A base-address-selection entry. */ | |
d4a087c7 | 104 | if ((low & base_mask) == base_mask) |
0d53c4c4 | 105 | { |
d4a087c7 | 106 | base_address = high + base_offset; |
0d53c4c4 DJ |
107 | continue; |
108 | } | |
109 | ||
b5758fe4 UW |
110 | /* An end-of-list entry. */ |
111 | if (low == 0 && high == 0) | |
112 | return NULL; | |
113 | ||
0d53c4c4 DJ |
114 | /* Otherwise, a location expression entry. */ |
115 | low += base_address; | |
116 | high += base_address; | |
117 | ||
e17a4113 | 118 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); |
0d53c4c4 DJ |
119 | loc_ptr += 2; |
120 | ||
121 | if (pc >= low && pc < high) | |
122 | { | |
123 | *locexpr_length = length; | |
124 | return loc_ptr; | |
125 | } | |
126 | ||
127 | loc_ptr += length; | |
128 | } | |
129 | } | |
130 | ||
4c2df51b DJ |
131 | /* This is the baton used when performing dwarf2 expression |
132 | evaluation. */ | |
133 | struct dwarf_expr_baton | |
134 | { | |
135 | struct frame_info *frame; | |
17ea53c3 | 136 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b DJ |
137 | }; |
138 | ||
139 | /* Helper functions for dwarf2_evaluate_loc_desc. */ | |
140 | ||
4bc9efe1 | 141 | /* Using the frame specified in BATON, return the value of register |
0b2b0195 | 142 | REGNUM, treated as a pointer. */ |
4c2df51b | 143 | static CORE_ADDR |
61fbb938 | 144 | dwarf_expr_read_reg (void *baton, int dwarf_regnum) |
4c2df51b | 145 | { |
4c2df51b | 146 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; |
5e2b427d | 147 | struct gdbarch *gdbarch = get_frame_arch (debaton->frame); |
e5192dd8 | 148 | CORE_ADDR result; |
0b2b0195 | 149 | int regnum; |
e4adbba9 | 150 | |
5e2b427d UW |
151 | regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_regnum); |
152 | result = address_from_register (builtin_type (gdbarch)->builtin_data_ptr, | |
0b2b0195 | 153 | regnum, debaton->frame); |
4c2df51b DJ |
154 | return result; |
155 | } | |
156 | ||
157 | /* Read memory at ADDR (length LEN) into BUF. */ | |
158 | ||
159 | static void | |
852483bc | 160 | dwarf_expr_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
4c2df51b DJ |
161 | { |
162 | read_memory (addr, buf, len); | |
163 | } | |
164 | ||
165 | /* Using the frame specified in BATON, find the location expression | |
166 | describing the frame base. Return a pointer to it in START and | |
167 | its length in LENGTH. */ | |
168 | static void | |
0d45f56e | 169 | dwarf_expr_frame_base (void *baton, const gdb_byte **start, size_t * length) |
4c2df51b | 170 | { |
da62e633 AC |
171 | /* FIXME: cagney/2003-03-26: This code should be using |
172 | get_frame_base_address(), and then implement a dwarf2 specific | |
173 | this_base method. */ | |
4c2df51b | 174 | struct symbol *framefunc; |
4c2df51b | 175 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; |
0d53c4c4 | 176 | |
edb3359d DJ |
177 | /* Use block_linkage_function, which returns a real (not inlined) |
178 | function, instead of get_frame_function, which may return an | |
179 | inlined function. */ | |
180 | framefunc = block_linkage_function (get_frame_block (debaton->frame, NULL)); | |
0d53c4c4 | 181 | |
eff4f95e JG |
182 | /* If we found a frame-relative symbol then it was certainly within |
183 | some function associated with a frame. If we can't find the frame, | |
184 | something has gone wrong. */ | |
185 | gdb_assert (framefunc != NULL); | |
186 | ||
0936ad1d SS |
187 | dwarf_expr_frame_base_1 (framefunc, |
188 | get_frame_address_in_block (debaton->frame), | |
189 | start, length); | |
190 | } | |
191 | ||
192 | static void | |
193 | dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc, | |
0d45f56e | 194 | const gdb_byte **start, size_t *length) |
0936ad1d | 195 | { |
edb3359d DJ |
196 | if (SYMBOL_LOCATION_BATON (framefunc) == NULL) |
197 | *start = NULL; | |
198 | else if (SYMBOL_COMPUTED_OPS (framefunc) == &dwarf2_loclist_funcs) | |
0d53c4c4 DJ |
199 | { |
200 | struct dwarf2_loclist_baton *symbaton; | |
22c6caba | 201 | |
0d53c4c4 | 202 | symbaton = SYMBOL_LOCATION_BATON (framefunc); |
8cf6f0b1 | 203 | *start = dwarf2_find_location_expression (symbaton, length, pc); |
0d53c4c4 DJ |
204 | } |
205 | else | |
206 | { | |
207 | struct dwarf2_locexpr_baton *symbaton; | |
9a619af0 | 208 | |
0d53c4c4 | 209 | symbaton = SYMBOL_LOCATION_BATON (framefunc); |
ebd3bcc1 JK |
210 | if (symbaton != NULL) |
211 | { | |
212 | *length = symbaton->size; | |
213 | *start = symbaton->data; | |
214 | } | |
215 | else | |
216 | *start = NULL; | |
0d53c4c4 DJ |
217 | } |
218 | ||
219 | if (*start == NULL) | |
8a3fe4f8 | 220 | error (_("Could not find the frame base for \"%s\"."), |
0d53c4c4 | 221 | SYMBOL_NATURAL_NAME (framefunc)); |
4c2df51b DJ |
222 | } |
223 | ||
e7802207 TT |
224 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for |
225 | the frame in BATON. */ | |
226 | ||
227 | static CORE_ADDR | |
228 | dwarf_expr_frame_cfa (void *baton) | |
229 | { | |
230 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
9a619af0 | 231 | |
e7802207 TT |
232 | return dwarf2_frame_cfa (debaton->frame); |
233 | } | |
234 | ||
8cf6f0b1 TT |
235 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for |
236 | the frame in BATON. */ | |
237 | ||
238 | static CORE_ADDR | |
239 | dwarf_expr_frame_pc (void *baton) | |
240 | { | |
241 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
242 | ||
243 | return get_frame_address_in_block (debaton->frame); | |
244 | } | |
245 | ||
4c2df51b DJ |
246 | /* Using the objfile specified in BATON, find the address for the |
247 | current thread's thread-local storage with offset OFFSET. */ | |
248 | static CORE_ADDR | |
249 | dwarf_expr_tls_address (void *baton, CORE_ADDR offset) | |
250 | { | |
251 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
17ea53c3 | 252 | struct objfile *objfile = dwarf2_per_cu_objfile (debaton->per_cu); |
4c2df51b | 253 | |
17ea53c3 | 254 | return target_translate_tls_address (objfile, offset); |
4c2df51b DJ |
255 | } |
256 | ||
3e43a32a MS |
257 | /* Call DWARF subroutine from DW_AT_location of DIE at DIE_OFFSET in |
258 | current CU (as is PER_CU). State of the CTX is not affected by the | |
259 | call and return. */ | |
5c631832 JK |
260 | |
261 | static void | |
262 | per_cu_dwarf_call (struct dwarf_expr_context *ctx, size_t die_offset, | |
8cf6f0b1 TT |
263 | struct dwarf2_per_cu_data *per_cu, |
264 | CORE_ADDR (*get_frame_pc) (void *baton), | |
265 | void *baton) | |
5c631832 JK |
266 | { |
267 | struct dwarf2_locexpr_baton block; | |
918dd910 | 268 | struct cleanup *back_to; |
5c631832 | 269 | |
8cf6f0b1 TT |
270 | block = dwarf2_fetch_die_location_block (die_offset, per_cu, |
271 | get_frame_pc, baton); | |
5c631832 | 272 | |
918dd910 JK |
273 | back_to = make_cleanup (xfree, (void *) block.data); |
274 | ||
5c631832 JK |
275 | /* DW_OP_call_ref is currently not supported. */ |
276 | gdb_assert (block.per_cu == per_cu); | |
277 | ||
278 | dwarf_expr_eval (ctx, block.data, block.size); | |
918dd910 JK |
279 | |
280 | do_cleanups (back_to); | |
5c631832 JK |
281 | } |
282 | ||
283 | /* Helper interface of per_cu_dwarf_call for dwarf2_evaluate_loc_desc. */ | |
284 | ||
285 | static void | |
286 | dwarf_expr_dwarf_call (struct dwarf_expr_context *ctx, size_t die_offset) | |
287 | { | |
288 | struct dwarf_expr_baton *debaton = ctx->baton; | |
289 | ||
37b50a69 | 290 | per_cu_dwarf_call (ctx, die_offset, debaton->per_cu, |
9e8b7a03 | 291 | ctx->funcs->get_frame_pc, ctx->baton); |
5c631832 JK |
292 | } |
293 | ||
8a9b8146 TT |
294 | /* Callback function for dwarf2_evaluate_loc_desc. */ |
295 | ||
296 | static struct type * | |
297 | dwarf_expr_get_base_type (struct dwarf_expr_context *ctx, size_t die_offset) | |
298 | { | |
299 | struct dwarf_expr_baton *debaton = ctx->baton; | |
300 | ||
301 | return dwarf2_get_die_type (die_offset, debaton->per_cu); | |
302 | } | |
303 | ||
052b9502 NF |
304 | struct piece_closure |
305 | { | |
88bfdde4 TT |
306 | /* Reference count. */ |
307 | int refc; | |
308 | ||
8cf6f0b1 TT |
309 | /* The CU from which this closure's expression came. */ |
310 | struct dwarf2_per_cu_data *per_cu; | |
311 | ||
052b9502 NF |
312 | /* The number of pieces used to describe this variable. */ |
313 | int n_pieces; | |
314 | ||
6063c216 UW |
315 | /* The target address size, used only for DWARF_VALUE_STACK. */ |
316 | int addr_size; | |
cec03d70 | 317 | |
052b9502 NF |
318 | /* The pieces themselves. */ |
319 | struct dwarf_expr_piece *pieces; | |
320 | }; | |
321 | ||
322 | /* Allocate a closure for a value formed from separately-described | |
323 | PIECES. */ | |
324 | ||
325 | static struct piece_closure * | |
8cf6f0b1 TT |
326 | allocate_piece_closure (struct dwarf2_per_cu_data *per_cu, |
327 | int n_pieces, struct dwarf_expr_piece *pieces, | |
6063c216 | 328 | int addr_size) |
052b9502 NF |
329 | { |
330 | struct piece_closure *c = XZALLOC (struct piece_closure); | |
8a9b8146 | 331 | int i; |
052b9502 | 332 | |
88bfdde4 | 333 | c->refc = 1; |
8cf6f0b1 | 334 | c->per_cu = per_cu; |
052b9502 | 335 | c->n_pieces = n_pieces; |
6063c216 | 336 | c->addr_size = addr_size; |
052b9502 NF |
337 | c->pieces = XCALLOC (n_pieces, struct dwarf_expr_piece); |
338 | ||
339 | memcpy (c->pieces, pieces, n_pieces * sizeof (struct dwarf_expr_piece)); | |
8a9b8146 TT |
340 | for (i = 0; i < n_pieces; ++i) |
341 | if (c->pieces[i].location == DWARF_VALUE_STACK) | |
342 | value_incref (c->pieces[i].v.value); | |
052b9502 NF |
343 | |
344 | return c; | |
345 | } | |
346 | ||
d3b1e874 TT |
347 | /* The lowest-level function to extract bits from a byte buffer. |
348 | SOURCE is the buffer. It is updated if we read to the end of a | |
349 | byte. | |
350 | SOURCE_OFFSET_BITS is the offset of the first bit to read. It is | |
351 | updated to reflect the number of bits actually read. | |
352 | NBITS is the number of bits we want to read. It is updated to | |
353 | reflect the number of bits actually read. This function may read | |
354 | fewer bits. | |
355 | BITS_BIG_ENDIAN is taken directly from gdbarch. | |
356 | This function returns the extracted bits. */ | |
357 | ||
358 | static unsigned int | |
359 | extract_bits_primitive (const gdb_byte **source, | |
360 | unsigned int *source_offset_bits, | |
361 | int *nbits, int bits_big_endian) | |
362 | { | |
363 | unsigned int avail, mask, datum; | |
364 | ||
365 | gdb_assert (*source_offset_bits < 8); | |
366 | ||
367 | avail = 8 - *source_offset_bits; | |
368 | if (avail > *nbits) | |
369 | avail = *nbits; | |
370 | ||
371 | mask = (1 << avail) - 1; | |
372 | datum = **source; | |
373 | if (bits_big_endian) | |
374 | datum >>= 8 - (*source_offset_bits + *nbits); | |
375 | else | |
376 | datum >>= *source_offset_bits; | |
377 | datum &= mask; | |
378 | ||
379 | *nbits -= avail; | |
380 | *source_offset_bits += avail; | |
381 | if (*source_offset_bits >= 8) | |
382 | { | |
383 | *source_offset_bits -= 8; | |
384 | ++*source; | |
385 | } | |
386 | ||
387 | return datum; | |
388 | } | |
389 | ||
390 | /* Extract some bits from a source buffer and move forward in the | |
391 | buffer. | |
392 | ||
393 | SOURCE is the source buffer. It is updated as bytes are read. | |
394 | SOURCE_OFFSET_BITS is the offset into SOURCE. It is updated as | |
395 | bits are read. | |
396 | NBITS is the number of bits to read. | |
397 | BITS_BIG_ENDIAN is taken directly from gdbarch. | |
398 | ||
399 | This function returns the bits that were read. */ | |
400 | ||
401 | static unsigned int | |
402 | extract_bits (const gdb_byte **source, unsigned int *source_offset_bits, | |
403 | int nbits, int bits_big_endian) | |
404 | { | |
405 | unsigned int datum; | |
406 | ||
407 | gdb_assert (nbits > 0 && nbits <= 8); | |
408 | ||
409 | datum = extract_bits_primitive (source, source_offset_bits, &nbits, | |
410 | bits_big_endian); | |
411 | if (nbits > 0) | |
412 | { | |
413 | unsigned int more; | |
414 | ||
415 | more = extract_bits_primitive (source, source_offset_bits, &nbits, | |
416 | bits_big_endian); | |
417 | if (bits_big_endian) | |
418 | datum <<= nbits; | |
419 | else | |
420 | more <<= nbits; | |
421 | datum |= more; | |
422 | } | |
423 | ||
424 | return datum; | |
425 | } | |
426 | ||
427 | /* Write some bits into a buffer and move forward in the buffer. | |
428 | ||
429 | DATUM is the bits to write. The low-order bits of DATUM are used. | |
430 | DEST is the destination buffer. It is updated as bytes are | |
431 | written. | |
432 | DEST_OFFSET_BITS is the bit offset in DEST at which writing is | |
433 | done. | |
434 | NBITS is the number of valid bits in DATUM. | |
435 | BITS_BIG_ENDIAN is taken directly from gdbarch. */ | |
436 | ||
437 | static void | |
438 | insert_bits (unsigned int datum, | |
439 | gdb_byte *dest, unsigned int dest_offset_bits, | |
440 | int nbits, int bits_big_endian) | |
441 | { | |
442 | unsigned int mask; | |
443 | ||
8c814cdd | 444 | gdb_assert (dest_offset_bits + nbits <= 8); |
d3b1e874 TT |
445 | |
446 | mask = (1 << nbits) - 1; | |
447 | if (bits_big_endian) | |
448 | { | |
449 | datum <<= 8 - (dest_offset_bits + nbits); | |
450 | mask <<= 8 - (dest_offset_bits + nbits); | |
451 | } | |
452 | else | |
453 | { | |
454 | datum <<= dest_offset_bits; | |
455 | mask <<= dest_offset_bits; | |
456 | } | |
457 | ||
458 | gdb_assert ((datum & ~mask) == 0); | |
459 | ||
460 | *dest = (*dest & ~mask) | datum; | |
461 | } | |
462 | ||
463 | /* Copy bits from a source to a destination. | |
464 | ||
465 | DEST is where the bits should be written. | |
466 | DEST_OFFSET_BITS is the bit offset into DEST. | |
467 | SOURCE is the source of bits. | |
468 | SOURCE_OFFSET_BITS is the bit offset into SOURCE. | |
469 | BIT_COUNT is the number of bits to copy. | |
470 | BITS_BIG_ENDIAN is taken directly from gdbarch. */ | |
471 | ||
472 | static void | |
473 | copy_bitwise (gdb_byte *dest, unsigned int dest_offset_bits, | |
474 | const gdb_byte *source, unsigned int source_offset_bits, | |
475 | unsigned int bit_count, | |
476 | int bits_big_endian) | |
477 | { | |
478 | unsigned int dest_avail; | |
479 | int datum; | |
480 | ||
481 | /* Reduce everything to byte-size pieces. */ | |
482 | dest += dest_offset_bits / 8; | |
483 | dest_offset_bits %= 8; | |
484 | source += source_offset_bits / 8; | |
485 | source_offset_bits %= 8; | |
486 | ||
487 | dest_avail = 8 - dest_offset_bits % 8; | |
488 | ||
489 | /* See if we can fill the first destination byte. */ | |
490 | if (dest_avail < bit_count) | |
491 | { | |
492 | datum = extract_bits (&source, &source_offset_bits, dest_avail, | |
493 | bits_big_endian); | |
494 | insert_bits (datum, dest, dest_offset_bits, dest_avail, bits_big_endian); | |
495 | ++dest; | |
496 | dest_offset_bits = 0; | |
497 | bit_count -= dest_avail; | |
498 | } | |
499 | ||
500 | /* Now, either DEST_OFFSET_BITS is byte-aligned, or we have fewer | |
501 | than 8 bits remaining. */ | |
502 | gdb_assert (dest_offset_bits % 8 == 0 || bit_count < 8); | |
503 | for (; bit_count >= 8; bit_count -= 8) | |
504 | { | |
505 | datum = extract_bits (&source, &source_offset_bits, 8, bits_big_endian); | |
506 | *dest++ = (gdb_byte) datum; | |
507 | } | |
508 | ||
509 | /* Finally, we may have a few leftover bits. */ | |
510 | gdb_assert (bit_count <= 8 - dest_offset_bits % 8); | |
511 | if (bit_count > 0) | |
512 | { | |
513 | datum = extract_bits (&source, &source_offset_bits, bit_count, | |
514 | bits_big_endian); | |
515 | insert_bits (datum, dest, dest_offset_bits, bit_count, bits_big_endian); | |
516 | } | |
517 | } | |
518 | ||
052b9502 NF |
519 | static void |
520 | read_pieced_value (struct value *v) | |
521 | { | |
522 | int i; | |
523 | long offset = 0; | |
d3b1e874 | 524 | ULONGEST bits_to_skip; |
052b9502 | 525 | gdb_byte *contents; |
3e43a32a MS |
526 | struct piece_closure *c |
527 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 528 | struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (v)); |
afd74c5f | 529 | size_t type_len; |
d3b1e874 TT |
530 | size_t buffer_size = 0; |
531 | char *buffer = NULL; | |
532 | struct cleanup *cleanup; | |
533 | int bits_big_endian | |
534 | = gdbarch_bits_big_endian (get_type_arch (value_type (v))); | |
afd74c5f TT |
535 | |
536 | if (value_type (v) != value_enclosing_type (v)) | |
537 | internal_error (__FILE__, __LINE__, | |
538 | _("Should not be able to create a lazy value with " | |
539 | "an enclosing type")); | |
052b9502 | 540 | |
d3b1e874 TT |
541 | cleanup = make_cleanup (free_current_contents, &buffer); |
542 | ||
052b9502 | 543 | contents = value_contents_raw (v); |
d3b1e874 | 544 | bits_to_skip = 8 * value_offset (v); |
0e03807e TT |
545 | if (value_bitsize (v)) |
546 | { | |
547 | bits_to_skip += value_bitpos (v); | |
548 | type_len = value_bitsize (v); | |
549 | } | |
550 | else | |
551 | type_len = 8 * TYPE_LENGTH (value_type (v)); | |
d3b1e874 | 552 | |
afd74c5f | 553 | for (i = 0; i < c->n_pieces && offset < type_len; i++) |
052b9502 NF |
554 | { |
555 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
d3b1e874 TT |
556 | size_t this_size, this_size_bits; |
557 | long dest_offset_bits, source_offset_bits, source_offset; | |
0d45f56e | 558 | const gdb_byte *intermediate_buffer; |
d3b1e874 TT |
559 | |
560 | /* Compute size, source, and destination offsets for copying, in | |
561 | bits. */ | |
562 | this_size_bits = p->size; | |
563 | if (bits_to_skip > 0 && bits_to_skip >= this_size_bits) | |
afd74c5f | 564 | { |
d3b1e874 | 565 | bits_to_skip -= this_size_bits; |
afd74c5f TT |
566 | continue; |
567 | } | |
d3b1e874 TT |
568 | if (this_size_bits > type_len - offset) |
569 | this_size_bits = type_len - offset; | |
570 | if (bits_to_skip > 0) | |
afd74c5f | 571 | { |
d3b1e874 TT |
572 | dest_offset_bits = 0; |
573 | source_offset_bits = bits_to_skip; | |
574 | this_size_bits -= bits_to_skip; | |
575 | bits_to_skip = 0; | |
afd74c5f TT |
576 | } |
577 | else | |
578 | { | |
d3b1e874 TT |
579 | dest_offset_bits = offset; |
580 | source_offset_bits = 0; | |
afd74c5f | 581 | } |
9a619af0 | 582 | |
d3b1e874 TT |
583 | this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8; |
584 | source_offset = source_offset_bits / 8; | |
585 | if (buffer_size < this_size) | |
586 | { | |
587 | buffer_size = this_size; | |
588 | buffer = xrealloc (buffer, buffer_size); | |
589 | } | |
590 | intermediate_buffer = buffer; | |
591 | ||
592 | /* Copy from the source to DEST_BUFFER. */ | |
cec03d70 | 593 | switch (p->location) |
052b9502 | 594 | { |
cec03d70 TT |
595 | case DWARF_VALUE_REGISTER: |
596 | { | |
597 | struct gdbarch *arch = get_frame_arch (frame); | |
8a9b8146 | 598 | int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, p->v.regno); |
afd74c5f | 599 | int reg_offset = source_offset; |
dcbf108f UW |
600 | |
601 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG | |
afd74c5f | 602 | && this_size < register_size (arch, gdb_regnum)) |
d3b1e874 TT |
603 | { |
604 | /* Big-endian, and we want less than full size. */ | |
605 | reg_offset = register_size (arch, gdb_regnum) - this_size; | |
606 | /* We want the lower-order THIS_SIZE_BITS of the bytes | |
607 | we extract from the register. */ | |
608 | source_offset_bits += 8 * this_size - this_size_bits; | |
609 | } | |
dcbf108f | 610 | |
63b4f126 MGD |
611 | if (gdb_regnum != -1) |
612 | { | |
8dccd430 PA |
613 | int optim, unavail; |
614 | ||
615 | if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset, | |
616 | this_size, buffer, | |
617 | &optim, &unavail)) | |
618 | { | |
619 | /* Just so garbage doesn't ever shine through. */ | |
620 | memset (buffer, 0, this_size); | |
621 | ||
622 | if (optim) | |
623 | set_value_optimized_out (v, 1); | |
624 | if (unavail) | |
625 | mark_value_bytes_unavailable (v, offset, this_size); | |
626 | } | |
63b4f126 MGD |
627 | } |
628 | else | |
629 | { | |
630 | error (_("Unable to access DWARF register number %s"), | |
8a9b8146 | 631 | paddress (arch, p->v.regno)); |
63b4f126 | 632 | } |
cec03d70 TT |
633 | } |
634 | break; | |
635 | ||
636 | case DWARF_VALUE_MEMORY: | |
e6ca34fc PA |
637 | read_value_memory (v, offset, |
638 | p->v.mem.in_stack_memory, | |
639 | p->v.mem.addr + source_offset, | |
640 | buffer, this_size); | |
cec03d70 TT |
641 | break; |
642 | ||
643 | case DWARF_VALUE_STACK: | |
644 | { | |
afd74c5f | 645 | size_t n = this_size; |
9a619af0 | 646 | |
afd74c5f TT |
647 | if (n > c->addr_size - source_offset) |
648 | n = (c->addr_size >= source_offset | |
649 | ? c->addr_size - source_offset | |
650 | : 0); | |
651 | if (n == 0) | |
652 | { | |
653 | /* Nothing. */ | |
654 | } | |
afd74c5f TT |
655 | else |
656 | { | |
8a9b8146 | 657 | const gdb_byte *val_bytes = value_contents_all (p->v.value); |
afd74c5f | 658 | |
8a9b8146 | 659 | intermediate_buffer = val_bytes + source_offset; |
afd74c5f | 660 | } |
cec03d70 TT |
661 | } |
662 | break; | |
663 | ||
664 | case DWARF_VALUE_LITERAL: | |
665 | { | |
afd74c5f TT |
666 | size_t n = this_size; |
667 | ||
668 | if (n > p->v.literal.length - source_offset) | |
669 | n = (p->v.literal.length >= source_offset | |
670 | ? p->v.literal.length - source_offset | |
671 | : 0); | |
672 | if (n != 0) | |
d3b1e874 | 673 | intermediate_buffer = p->v.literal.data + source_offset; |
cec03d70 TT |
674 | } |
675 | break; | |
676 | ||
8cf6f0b1 TT |
677 | /* These bits show up as zeros -- but do not cause the value |
678 | to be considered optimized-out. */ | |
679 | case DWARF_VALUE_IMPLICIT_POINTER: | |
680 | break; | |
681 | ||
cb826367 | 682 | case DWARF_VALUE_OPTIMIZED_OUT: |
0e03807e | 683 | set_value_optimized_out (v, 1); |
cb826367 TT |
684 | break; |
685 | ||
cec03d70 TT |
686 | default: |
687 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
052b9502 | 688 | } |
d3b1e874 | 689 | |
8cf6f0b1 TT |
690 | if (p->location != DWARF_VALUE_OPTIMIZED_OUT |
691 | && p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
d3b1e874 TT |
692 | copy_bitwise (contents, dest_offset_bits, |
693 | intermediate_buffer, source_offset_bits % 8, | |
694 | this_size_bits, bits_big_endian); | |
695 | ||
696 | offset += this_size_bits; | |
052b9502 | 697 | } |
d3b1e874 TT |
698 | |
699 | do_cleanups (cleanup); | |
052b9502 NF |
700 | } |
701 | ||
702 | static void | |
703 | write_pieced_value (struct value *to, struct value *from) | |
704 | { | |
705 | int i; | |
706 | long offset = 0; | |
d3b1e874 | 707 | ULONGEST bits_to_skip; |
afd74c5f | 708 | const gdb_byte *contents; |
3e43a32a MS |
709 | struct piece_closure *c |
710 | = (struct piece_closure *) value_computed_closure (to); | |
052b9502 | 711 | struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (to)); |
afd74c5f | 712 | size_t type_len; |
d3b1e874 TT |
713 | size_t buffer_size = 0; |
714 | char *buffer = NULL; | |
715 | struct cleanup *cleanup; | |
716 | int bits_big_endian | |
717 | = gdbarch_bits_big_endian (get_type_arch (value_type (to))); | |
052b9502 NF |
718 | |
719 | if (frame == NULL) | |
720 | { | |
721 | set_value_optimized_out (to, 1); | |
722 | return; | |
723 | } | |
724 | ||
d3b1e874 TT |
725 | cleanup = make_cleanup (free_current_contents, &buffer); |
726 | ||
afd74c5f | 727 | contents = value_contents (from); |
d3b1e874 | 728 | bits_to_skip = 8 * value_offset (to); |
0e03807e TT |
729 | if (value_bitsize (to)) |
730 | { | |
731 | bits_to_skip += value_bitpos (to); | |
732 | type_len = value_bitsize (to); | |
733 | } | |
734 | else | |
735 | type_len = 8 * TYPE_LENGTH (value_type (to)); | |
736 | ||
afd74c5f | 737 | for (i = 0; i < c->n_pieces && offset < type_len; i++) |
052b9502 NF |
738 | { |
739 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
d3b1e874 TT |
740 | size_t this_size_bits, this_size; |
741 | long dest_offset_bits, source_offset_bits, dest_offset, source_offset; | |
742 | int need_bitwise; | |
743 | const gdb_byte *source_buffer; | |
afd74c5f | 744 | |
d3b1e874 TT |
745 | this_size_bits = p->size; |
746 | if (bits_to_skip > 0 && bits_to_skip >= this_size_bits) | |
afd74c5f | 747 | { |
d3b1e874 | 748 | bits_to_skip -= this_size_bits; |
afd74c5f TT |
749 | continue; |
750 | } | |
d3b1e874 TT |
751 | if (this_size_bits > type_len - offset) |
752 | this_size_bits = type_len - offset; | |
753 | if (bits_to_skip > 0) | |
afd74c5f | 754 | { |
d3b1e874 TT |
755 | dest_offset_bits = bits_to_skip; |
756 | source_offset_bits = 0; | |
757 | this_size_bits -= bits_to_skip; | |
758 | bits_to_skip = 0; | |
afd74c5f TT |
759 | } |
760 | else | |
761 | { | |
d3b1e874 TT |
762 | dest_offset_bits = 0; |
763 | source_offset_bits = offset; | |
764 | } | |
765 | ||
766 | this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8; | |
767 | source_offset = source_offset_bits / 8; | |
768 | dest_offset = dest_offset_bits / 8; | |
769 | if (dest_offset_bits % 8 == 0 && source_offset_bits % 8 == 0) | |
770 | { | |
771 | source_buffer = contents + source_offset; | |
772 | need_bitwise = 0; | |
773 | } | |
774 | else | |
775 | { | |
776 | if (buffer_size < this_size) | |
777 | { | |
778 | buffer_size = this_size; | |
779 | buffer = xrealloc (buffer, buffer_size); | |
780 | } | |
781 | source_buffer = buffer; | |
782 | need_bitwise = 1; | |
afd74c5f | 783 | } |
9a619af0 | 784 | |
cec03d70 | 785 | switch (p->location) |
052b9502 | 786 | { |
cec03d70 TT |
787 | case DWARF_VALUE_REGISTER: |
788 | { | |
789 | struct gdbarch *arch = get_frame_arch (frame); | |
8a9b8146 | 790 | int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, p->v.regno); |
afd74c5f | 791 | int reg_offset = dest_offset; |
dcbf108f UW |
792 | |
793 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG | |
afd74c5f | 794 | && this_size <= register_size (arch, gdb_regnum)) |
dcbf108f | 795 | /* Big-endian, and we want less than full size. */ |
afd74c5f | 796 | reg_offset = register_size (arch, gdb_regnum) - this_size; |
dcbf108f | 797 | |
63b4f126 MGD |
798 | if (gdb_regnum != -1) |
799 | { | |
d3b1e874 TT |
800 | if (need_bitwise) |
801 | { | |
8dccd430 PA |
802 | int optim, unavail; |
803 | ||
804 | if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset, | |
805 | this_size, buffer, | |
806 | &optim, &unavail)) | |
807 | { | |
808 | if (optim) | |
809 | error (_("Can't do read-modify-write to " | |
810 | "update bitfield; containing word has been " | |
811 | "optimized out")); | |
812 | if (unavail) | |
813 | throw_error (NOT_AVAILABLE_ERROR, | |
814 | _("Can't do read-modify-write to update " | |
815 | "bitfield; containing word " | |
816 | "is unavailable")); | |
817 | } | |
d3b1e874 TT |
818 | copy_bitwise (buffer, dest_offset_bits, |
819 | contents, source_offset_bits, | |
820 | this_size_bits, | |
821 | bits_big_endian); | |
822 | } | |
823 | ||
63b4f126 | 824 | put_frame_register_bytes (frame, gdb_regnum, reg_offset, |
d3b1e874 | 825 | this_size, source_buffer); |
63b4f126 MGD |
826 | } |
827 | else | |
828 | { | |
829 | error (_("Unable to write to DWARF register number %s"), | |
8a9b8146 | 830 | paddress (arch, p->v.regno)); |
63b4f126 | 831 | } |
cec03d70 TT |
832 | } |
833 | break; | |
834 | case DWARF_VALUE_MEMORY: | |
d3b1e874 TT |
835 | if (need_bitwise) |
836 | { | |
837 | /* Only the first and last bytes can possibly have any | |
838 | bits reused. */ | |
f2c7657e UW |
839 | read_memory (p->v.mem.addr + dest_offset, buffer, 1); |
840 | read_memory (p->v.mem.addr + dest_offset + this_size - 1, | |
d3b1e874 TT |
841 | buffer + this_size - 1, 1); |
842 | copy_bitwise (buffer, dest_offset_bits, | |
843 | contents, source_offset_bits, | |
844 | this_size_bits, | |
845 | bits_big_endian); | |
846 | } | |
847 | ||
f2c7657e | 848 | write_memory (p->v.mem.addr + dest_offset, |
d3b1e874 | 849 | source_buffer, this_size); |
cec03d70 TT |
850 | break; |
851 | default: | |
852 | set_value_optimized_out (to, 1); | |
0e03807e | 853 | break; |
052b9502 | 854 | } |
d3b1e874 | 855 | offset += this_size_bits; |
052b9502 | 856 | } |
d3b1e874 | 857 | |
d3b1e874 | 858 | do_cleanups (cleanup); |
052b9502 NF |
859 | } |
860 | ||
8cf6f0b1 TT |
861 | /* A helper function that checks bit validity in a pieced value. |
862 | CHECK_FOR indicates the kind of validity checking. | |
863 | DWARF_VALUE_MEMORY means to check whether any bit is valid. | |
864 | DWARF_VALUE_OPTIMIZED_OUT means to check whether any bit is | |
865 | optimized out. | |
866 | DWARF_VALUE_IMPLICIT_POINTER means to check whether the bits are an | |
867 | implicit pointer. */ | |
868 | ||
0e03807e TT |
869 | static int |
870 | check_pieced_value_bits (const struct value *value, int bit_offset, | |
8cf6f0b1 TT |
871 | int bit_length, |
872 | enum dwarf_value_location check_for) | |
0e03807e TT |
873 | { |
874 | struct piece_closure *c | |
875 | = (struct piece_closure *) value_computed_closure (value); | |
876 | int i; | |
8cf6f0b1 TT |
877 | int validity = (check_for == DWARF_VALUE_MEMORY |
878 | || check_for == DWARF_VALUE_IMPLICIT_POINTER); | |
0e03807e TT |
879 | |
880 | bit_offset += 8 * value_offset (value); | |
881 | if (value_bitsize (value)) | |
882 | bit_offset += value_bitpos (value); | |
883 | ||
884 | for (i = 0; i < c->n_pieces && bit_length > 0; i++) | |
885 | { | |
886 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
887 | size_t this_size_bits = p->size; | |
888 | ||
889 | if (bit_offset > 0) | |
890 | { | |
891 | if (bit_offset >= this_size_bits) | |
892 | { | |
893 | bit_offset -= this_size_bits; | |
894 | continue; | |
895 | } | |
896 | ||
897 | bit_length -= this_size_bits - bit_offset; | |
898 | bit_offset = 0; | |
899 | } | |
900 | else | |
901 | bit_length -= this_size_bits; | |
902 | ||
8cf6f0b1 TT |
903 | if (check_for == DWARF_VALUE_IMPLICIT_POINTER) |
904 | { | |
905 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
906 | return 0; | |
907 | } | |
908 | else if (p->location == DWARF_VALUE_OPTIMIZED_OUT | |
909 | || p->location == DWARF_VALUE_IMPLICIT_POINTER) | |
0e03807e TT |
910 | { |
911 | if (validity) | |
912 | return 0; | |
913 | } | |
914 | else | |
915 | { | |
916 | if (!validity) | |
917 | return 1; | |
918 | } | |
919 | } | |
920 | ||
921 | return validity; | |
922 | } | |
923 | ||
924 | static int | |
925 | check_pieced_value_validity (const struct value *value, int bit_offset, | |
926 | int bit_length) | |
927 | { | |
8cf6f0b1 TT |
928 | return check_pieced_value_bits (value, bit_offset, bit_length, |
929 | DWARF_VALUE_MEMORY); | |
0e03807e TT |
930 | } |
931 | ||
932 | static int | |
933 | check_pieced_value_invalid (const struct value *value) | |
934 | { | |
935 | return check_pieced_value_bits (value, 0, | |
8cf6f0b1 TT |
936 | 8 * TYPE_LENGTH (value_type (value)), |
937 | DWARF_VALUE_OPTIMIZED_OUT); | |
938 | } | |
939 | ||
940 | /* An implementation of an lval_funcs method to see whether a value is | |
941 | a synthetic pointer. */ | |
942 | ||
943 | static int | |
944 | check_pieced_synthetic_pointer (const struct value *value, int bit_offset, | |
945 | int bit_length) | |
946 | { | |
947 | return check_pieced_value_bits (value, bit_offset, bit_length, | |
948 | DWARF_VALUE_IMPLICIT_POINTER); | |
949 | } | |
950 | ||
951 | /* A wrapper function for get_frame_address_in_block. */ | |
952 | ||
953 | static CORE_ADDR | |
954 | get_frame_address_in_block_wrapper (void *baton) | |
955 | { | |
956 | return get_frame_address_in_block (baton); | |
957 | } | |
958 | ||
959 | /* An implementation of an lval_funcs method to indirect through a | |
960 | pointer. This handles the synthetic pointer case when needed. */ | |
961 | ||
962 | static struct value * | |
963 | indirect_pieced_value (struct value *value) | |
964 | { | |
965 | struct piece_closure *c | |
966 | = (struct piece_closure *) value_computed_closure (value); | |
967 | struct type *type; | |
968 | struct frame_info *frame; | |
969 | struct dwarf2_locexpr_baton baton; | |
970 | int i, bit_offset, bit_length; | |
971 | struct dwarf_expr_piece *piece = NULL; | |
972 | struct value *result; | |
973 | LONGEST byte_offset; | |
918dd910 | 974 | struct cleanup *back_to; |
8cf6f0b1 | 975 | |
0e37a63c | 976 | type = check_typedef (value_type (value)); |
8cf6f0b1 TT |
977 | if (TYPE_CODE (type) != TYPE_CODE_PTR) |
978 | return NULL; | |
979 | ||
980 | bit_length = 8 * TYPE_LENGTH (type); | |
981 | bit_offset = 8 * value_offset (value); | |
982 | if (value_bitsize (value)) | |
983 | bit_offset += value_bitpos (value); | |
984 | ||
985 | for (i = 0; i < c->n_pieces && bit_length > 0; i++) | |
986 | { | |
987 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
988 | size_t this_size_bits = p->size; | |
989 | ||
990 | if (bit_offset > 0) | |
991 | { | |
992 | if (bit_offset >= this_size_bits) | |
993 | { | |
994 | bit_offset -= this_size_bits; | |
995 | continue; | |
996 | } | |
997 | ||
998 | bit_length -= this_size_bits - bit_offset; | |
999 | bit_offset = 0; | |
1000 | } | |
1001 | else | |
1002 | bit_length -= this_size_bits; | |
1003 | ||
1004 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
1005 | return NULL; | |
1006 | ||
1007 | if (bit_length != 0) | |
1008 | error (_("Invalid use of DW_OP_GNU_implicit_pointer")); | |
1009 | ||
1010 | piece = p; | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | frame = get_selected_frame (_("No frame selected.")); | |
1015 | byte_offset = value_as_address (value); | |
1016 | ||
e0e40094 | 1017 | gdb_assert (piece); |
8cf6f0b1 TT |
1018 | baton = dwarf2_fetch_die_location_block (piece->v.ptr.die, c->per_cu, |
1019 | get_frame_address_in_block_wrapper, | |
1020 | frame); | |
1021 | ||
918dd910 JK |
1022 | back_to = make_cleanup (xfree, (void *) baton.data); |
1023 | ||
8cf6f0b1 TT |
1024 | result = dwarf2_evaluate_loc_desc_full (TYPE_TARGET_TYPE (type), frame, |
1025 | baton.data, baton.size, baton.per_cu, | |
1026 | byte_offset); | |
1027 | ||
918dd910 JK |
1028 | do_cleanups (back_to); |
1029 | ||
8cf6f0b1 | 1030 | return result; |
0e03807e TT |
1031 | } |
1032 | ||
052b9502 | 1033 | static void * |
0e03807e | 1034 | copy_pieced_value_closure (const struct value *v) |
052b9502 | 1035 | { |
3e43a32a MS |
1036 | struct piece_closure *c |
1037 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 1038 | |
88bfdde4 TT |
1039 | ++c->refc; |
1040 | return c; | |
052b9502 NF |
1041 | } |
1042 | ||
1043 | static void | |
1044 | free_pieced_value_closure (struct value *v) | |
1045 | { | |
3e43a32a MS |
1046 | struct piece_closure *c |
1047 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 1048 | |
88bfdde4 TT |
1049 | --c->refc; |
1050 | if (c->refc == 0) | |
1051 | { | |
8a9b8146 TT |
1052 | int i; |
1053 | ||
1054 | for (i = 0; i < c->n_pieces; ++i) | |
1055 | if (c->pieces[i].location == DWARF_VALUE_STACK) | |
1056 | value_free (c->pieces[i].v.value); | |
1057 | ||
88bfdde4 TT |
1058 | xfree (c->pieces); |
1059 | xfree (c); | |
1060 | } | |
052b9502 NF |
1061 | } |
1062 | ||
1063 | /* Functions for accessing a variable described by DW_OP_piece. */ | |
c8f2448a | 1064 | static const struct lval_funcs pieced_value_funcs = { |
052b9502 NF |
1065 | read_pieced_value, |
1066 | write_pieced_value, | |
0e03807e TT |
1067 | check_pieced_value_validity, |
1068 | check_pieced_value_invalid, | |
8cf6f0b1 TT |
1069 | indirect_pieced_value, |
1070 | check_pieced_synthetic_pointer, | |
052b9502 NF |
1071 | copy_pieced_value_closure, |
1072 | free_pieced_value_closure | |
1073 | }; | |
1074 | ||
8cf6f0b1 TT |
1075 | /* Helper function which throws an error if a synthetic pointer is |
1076 | invalid. */ | |
1077 | ||
1078 | static void | |
1079 | invalid_synthetic_pointer (void) | |
1080 | { | |
3e43a32a MS |
1081 | error (_("access outside bounds of object " |
1082 | "referenced via synthetic pointer")); | |
8cf6f0b1 TT |
1083 | } |
1084 | ||
9e8b7a03 JK |
1085 | /* Virtual method table for dwarf2_evaluate_loc_desc_full below. */ |
1086 | ||
1087 | static const struct dwarf_expr_context_funcs dwarf_expr_ctx_funcs = | |
1088 | { | |
1089 | dwarf_expr_read_reg, | |
1090 | dwarf_expr_read_mem, | |
1091 | dwarf_expr_frame_base, | |
1092 | dwarf_expr_frame_cfa, | |
1093 | dwarf_expr_frame_pc, | |
1094 | dwarf_expr_tls_address, | |
1095 | dwarf_expr_dwarf_call, | |
1096 | dwarf_expr_get_base_type | |
1097 | }; | |
1098 | ||
4c2df51b | 1099 | /* Evaluate a location description, starting at DATA and with length |
8cf6f0b1 TT |
1100 | SIZE, to find the current location of variable of TYPE in the |
1101 | context of FRAME. BYTE_OFFSET is applied after the contents are | |
1102 | computed. */ | |
a2d33775 | 1103 | |
8cf6f0b1 TT |
1104 | static struct value * |
1105 | dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame, | |
1106 | const gdb_byte *data, unsigned short size, | |
1107 | struct dwarf2_per_cu_data *per_cu, | |
1108 | LONGEST byte_offset) | |
4c2df51b | 1109 | { |
4c2df51b DJ |
1110 | struct value *retval; |
1111 | struct dwarf_expr_baton baton; | |
1112 | struct dwarf_expr_context *ctx; | |
72fc29ff | 1113 | struct cleanup *old_chain, *value_chain; |
ac56253d | 1114 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
79e1a869 | 1115 | volatile struct gdb_exception ex; |
4c2df51b | 1116 | |
8cf6f0b1 TT |
1117 | if (byte_offset < 0) |
1118 | invalid_synthetic_pointer (); | |
1119 | ||
0d53c4c4 | 1120 | if (size == 0) |
a7035dbb | 1121 | return allocate_optimized_out_value (type); |
0d53c4c4 | 1122 | |
4c2df51b | 1123 | baton.frame = frame; |
17ea53c3 | 1124 | baton.per_cu = per_cu; |
4c2df51b DJ |
1125 | |
1126 | ctx = new_dwarf_expr_context (); | |
4a227398 | 1127 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 1128 | value_chain = make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 1129 | |
ac56253d | 1130 | ctx->gdbarch = get_objfile_arch (objfile); |
ae0d2f24 | 1131 | ctx->addr_size = dwarf2_per_cu_addr_size (per_cu); |
9aa1f1e3 | 1132 | ctx->offset = dwarf2_per_cu_text_offset (per_cu); |
4c2df51b | 1133 | ctx->baton = &baton; |
9e8b7a03 | 1134 | ctx->funcs = &dwarf_expr_ctx_funcs; |
4c2df51b | 1135 | |
79e1a869 PA |
1136 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
1137 | { | |
1138 | dwarf_expr_eval (ctx, data, size); | |
1139 | } | |
1140 | if (ex.reason < 0) | |
1141 | { | |
1142 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1143 | { | |
72fc29ff | 1144 | do_cleanups (old_chain); |
79e1a869 PA |
1145 | retval = allocate_value (type); |
1146 | mark_value_bytes_unavailable (retval, 0, TYPE_LENGTH (type)); | |
1147 | return retval; | |
1148 | } | |
1149 | else | |
1150 | throw_exception (ex); | |
1151 | } | |
1152 | ||
87808bd6 JB |
1153 | if (ctx->num_pieces > 0) |
1154 | { | |
052b9502 NF |
1155 | struct piece_closure *c; |
1156 | struct frame_id frame_id = get_frame_id (frame); | |
8cf6f0b1 TT |
1157 | ULONGEST bit_size = 0; |
1158 | int i; | |
052b9502 | 1159 | |
8cf6f0b1 TT |
1160 | for (i = 0; i < ctx->num_pieces; ++i) |
1161 | bit_size += ctx->pieces[i].size; | |
1162 | if (8 * (byte_offset + TYPE_LENGTH (type)) > bit_size) | |
1163 | invalid_synthetic_pointer (); | |
1164 | ||
1165 | c = allocate_piece_closure (per_cu, ctx->num_pieces, ctx->pieces, | |
6063c216 | 1166 | ctx->addr_size); |
72fc29ff TT |
1167 | /* We must clean up the value chain after creating the piece |
1168 | closure but before allocating the result. */ | |
1169 | do_cleanups (value_chain); | |
a2d33775 | 1170 | retval = allocate_computed_value (type, &pieced_value_funcs, c); |
052b9502 | 1171 | VALUE_FRAME_ID (retval) = frame_id; |
8cf6f0b1 | 1172 | set_value_offset (retval, byte_offset); |
87808bd6 | 1173 | } |
4c2df51b DJ |
1174 | else |
1175 | { | |
cec03d70 TT |
1176 | switch (ctx->location) |
1177 | { | |
1178 | case DWARF_VALUE_REGISTER: | |
1179 | { | |
1180 | struct gdbarch *arch = get_frame_arch (frame); | |
8a9b8146 | 1181 | ULONGEST dwarf_regnum = value_as_long (dwarf_expr_fetch (ctx, 0)); |
cec03d70 | 1182 | int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_regnum); |
9a619af0 | 1183 | |
8cf6f0b1 TT |
1184 | if (byte_offset != 0) |
1185 | error (_("cannot use offset on synthetic pointer to register")); | |
72fc29ff | 1186 | do_cleanups (value_chain); |
63b4f126 | 1187 | if (gdb_regnum != -1) |
a2d33775 | 1188 | retval = value_from_register (type, gdb_regnum, frame); |
63b4f126 | 1189 | else |
a2d33775 JK |
1190 | error (_("Unable to access DWARF register number %s"), |
1191 | paddress (arch, dwarf_regnum)); | |
cec03d70 TT |
1192 | } |
1193 | break; | |
1194 | ||
1195 | case DWARF_VALUE_MEMORY: | |
1196 | { | |
f2c7657e | 1197 | CORE_ADDR address = dwarf_expr_fetch_address (ctx, 0); |
44353522 | 1198 | int in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0); |
cec03d70 | 1199 | |
72fc29ff | 1200 | do_cleanups (value_chain); |
41e8491f | 1201 | retval = allocate_value_lazy (type); |
cec03d70 | 1202 | VALUE_LVAL (retval) = lval_memory; |
44353522 DE |
1203 | if (in_stack_memory) |
1204 | set_value_stack (retval, 1); | |
8cf6f0b1 | 1205 | set_value_address (retval, address + byte_offset); |
cec03d70 TT |
1206 | } |
1207 | break; | |
1208 | ||
1209 | case DWARF_VALUE_STACK: | |
1210 | { | |
8a9b8146 TT |
1211 | struct value *value = dwarf_expr_fetch (ctx, 0); |
1212 | gdb_byte *contents; | |
1213 | const gdb_byte *val_bytes; | |
1214 | size_t n = TYPE_LENGTH (value_type (value)); | |
cec03d70 | 1215 | |
8cf6f0b1 TT |
1216 | if (byte_offset + TYPE_LENGTH (type) > n) |
1217 | invalid_synthetic_pointer (); | |
1218 | ||
8a9b8146 TT |
1219 | val_bytes = value_contents_all (value); |
1220 | val_bytes += byte_offset; | |
8cf6f0b1 TT |
1221 | n -= byte_offset; |
1222 | ||
72fc29ff TT |
1223 | /* Preserve VALUE because we are going to free values back |
1224 | to the mark, but we still need the value contents | |
1225 | below. */ | |
1226 | value_incref (value); | |
1227 | do_cleanups (value_chain); | |
1228 | make_cleanup_value_free (value); | |
1229 | ||
a2d33775 | 1230 | retval = allocate_value (type); |
cec03d70 | 1231 | contents = value_contents_raw (retval); |
a2d33775 JK |
1232 | if (n > TYPE_LENGTH (type)) |
1233 | n = TYPE_LENGTH (type); | |
8a9b8146 | 1234 | memcpy (contents, val_bytes, n); |
cec03d70 TT |
1235 | } |
1236 | break; | |
1237 | ||
1238 | case DWARF_VALUE_LITERAL: | |
1239 | { | |
1240 | bfd_byte *contents; | |
8c814cdd | 1241 | const bfd_byte *ldata; |
cec03d70 TT |
1242 | size_t n = ctx->len; |
1243 | ||
8cf6f0b1 TT |
1244 | if (byte_offset + TYPE_LENGTH (type) > n) |
1245 | invalid_synthetic_pointer (); | |
1246 | ||
72fc29ff | 1247 | do_cleanups (value_chain); |
a2d33775 | 1248 | retval = allocate_value (type); |
cec03d70 | 1249 | contents = value_contents_raw (retval); |
8cf6f0b1 | 1250 | |
8c814cdd | 1251 | ldata = ctx->data + byte_offset; |
8cf6f0b1 TT |
1252 | n -= byte_offset; |
1253 | ||
a2d33775 JK |
1254 | if (n > TYPE_LENGTH (type)) |
1255 | n = TYPE_LENGTH (type); | |
8c814cdd | 1256 | memcpy (contents, ldata, n); |
cec03d70 TT |
1257 | } |
1258 | break; | |
1259 | ||
dd90784c | 1260 | case DWARF_VALUE_OPTIMIZED_OUT: |
72fc29ff | 1261 | do_cleanups (value_chain); |
a7035dbb | 1262 | retval = allocate_optimized_out_value (type); |
dd90784c JK |
1263 | break; |
1264 | ||
8cf6f0b1 TT |
1265 | /* DWARF_VALUE_IMPLICIT_POINTER was converted to a pieced |
1266 | operation by execute_stack_op. */ | |
1267 | case DWARF_VALUE_IMPLICIT_POINTER: | |
cb826367 TT |
1268 | /* DWARF_VALUE_OPTIMIZED_OUT can't occur in this context -- |
1269 | it can only be encountered when making a piece. */ | |
cec03d70 TT |
1270 | default: |
1271 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
1272 | } | |
4c2df51b DJ |
1273 | } |
1274 | ||
42be36b3 CT |
1275 | set_value_initialized (retval, ctx->initialized); |
1276 | ||
4a227398 | 1277 | do_cleanups (old_chain); |
4c2df51b DJ |
1278 | |
1279 | return retval; | |
1280 | } | |
8cf6f0b1 TT |
1281 | |
1282 | /* The exported interface to dwarf2_evaluate_loc_desc_full; it always | |
1283 | passes 0 as the byte_offset. */ | |
1284 | ||
1285 | struct value * | |
1286 | dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame, | |
1287 | const gdb_byte *data, unsigned short size, | |
1288 | struct dwarf2_per_cu_data *per_cu) | |
1289 | { | |
1290 | return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, 0); | |
1291 | } | |
1292 | ||
4c2df51b DJ |
1293 | \f |
1294 | /* Helper functions and baton for dwarf2_loc_desc_needs_frame. */ | |
1295 | ||
1296 | struct needs_frame_baton | |
1297 | { | |
1298 | int needs_frame; | |
17ea53c3 | 1299 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b DJ |
1300 | }; |
1301 | ||
1302 | /* Reads from registers do require a frame. */ | |
1303 | static CORE_ADDR | |
61fbb938 | 1304 | needs_frame_read_reg (void *baton, int regnum) |
4c2df51b DJ |
1305 | { |
1306 | struct needs_frame_baton *nf_baton = baton; | |
9a619af0 | 1307 | |
4c2df51b DJ |
1308 | nf_baton->needs_frame = 1; |
1309 | return 1; | |
1310 | } | |
1311 | ||
1312 | /* Reads from memory do not require a frame. */ | |
1313 | static void | |
852483bc | 1314 | needs_frame_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
4c2df51b DJ |
1315 | { |
1316 | memset (buf, 0, len); | |
1317 | } | |
1318 | ||
1319 | /* Frame-relative accesses do require a frame. */ | |
1320 | static void | |
0d45f56e | 1321 | needs_frame_frame_base (void *baton, const gdb_byte **start, size_t * length) |
4c2df51b | 1322 | { |
852483bc | 1323 | static gdb_byte lit0 = DW_OP_lit0; |
4c2df51b DJ |
1324 | struct needs_frame_baton *nf_baton = baton; |
1325 | ||
1326 | *start = &lit0; | |
1327 | *length = 1; | |
1328 | ||
1329 | nf_baton->needs_frame = 1; | |
1330 | } | |
1331 | ||
e7802207 TT |
1332 | /* CFA accesses require a frame. */ |
1333 | ||
1334 | static CORE_ADDR | |
1335 | needs_frame_frame_cfa (void *baton) | |
1336 | { | |
1337 | struct needs_frame_baton *nf_baton = baton; | |
9a619af0 | 1338 | |
e7802207 TT |
1339 | nf_baton->needs_frame = 1; |
1340 | return 1; | |
1341 | } | |
1342 | ||
4c2df51b DJ |
1343 | /* Thread-local accesses do require a frame. */ |
1344 | static CORE_ADDR | |
1345 | needs_frame_tls_address (void *baton, CORE_ADDR offset) | |
1346 | { | |
1347 | struct needs_frame_baton *nf_baton = baton; | |
9a619af0 | 1348 | |
4c2df51b DJ |
1349 | nf_baton->needs_frame = 1; |
1350 | return 1; | |
1351 | } | |
1352 | ||
5c631832 JK |
1353 | /* Helper interface of per_cu_dwarf_call for dwarf2_loc_desc_needs_frame. */ |
1354 | ||
1355 | static void | |
1356 | needs_frame_dwarf_call (struct dwarf_expr_context *ctx, size_t die_offset) | |
1357 | { | |
1358 | struct needs_frame_baton *nf_baton = ctx->baton; | |
1359 | ||
37b50a69 | 1360 | per_cu_dwarf_call (ctx, die_offset, nf_baton->per_cu, |
9e8b7a03 | 1361 | ctx->funcs->get_frame_pc, ctx->baton); |
5c631832 JK |
1362 | } |
1363 | ||
9e8b7a03 JK |
1364 | /* Virtual method table for dwarf2_loc_desc_needs_frame below. */ |
1365 | ||
1366 | static const struct dwarf_expr_context_funcs needs_frame_ctx_funcs = | |
1367 | { | |
1368 | needs_frame_read_reg, | |
1369 | needs_frame_read_mem, | |
1370 | needs_frame_frame_base, | |
1371 | needs_frame_frame_cfa, | |
1372 | needs_frame_frame_cfa, /* get_frame_pc */ | |
1373 | needs_frame_tls_address, | |
1374 | needs_frame_dwarf_call, | |
1375 | NULL /* get_base_type */ | |
1376 | }; | |
1377 | ||
4c2df51b DJ |
1378 | /* Return non-zero iff the location expression at DATA (length SIZE) |
1379 | requires a frame to evaluate. */ | |
1380 | ||
1381 | static int | |
947bb88f | 1382 | dwarf2_loc_desc_needs_frame (const gdb_byte *data, unsigned short size, |
ae0d2f24 | 1383 | struct dwarf2_per_cu_data *per_cu) |
4c2df51b DJ |
1384 | { |
1385 | struct needs_frame_baton baton; | |
1386 | struct dwarf_expr_context *ctx; | |
f630a401 | 1387 | int in_reg; |
4a227398 | 1388 | struct cleanup *old_chain; |
ac56253d | 1389 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b DJ |
1390 | |
1391 | baton.needs_frame = 0; | |
17ea53c3 | 1392 | baton.per_cu = per_cu; |
4c2df51b DJ |
1393 | |
1394 | ctx = new_dwarf_expr_context (); | |
4a227398 | 1395 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 1396 | make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 1397 | |
ac56253d | 1398 | ctx->gdbarch = get_objfile_arch (objfile); |
ae0d2f24 | 1399 | ctx->addr_size = dwarf2_per_cu_addr_size (per_cu); |
9aa1f1e3 | 1400 | ctx->offset = dwarf2_per_cu_text_offset (per_cu); |
4c2df51b | 1401 | ctx->baton = &baton; |
9e8b7a03 | 1402 | ctx->funcs = &needs_frame_ctx_funcs; |
4c2df51b DJ |
1403 | |
1404 | dwarf_expr_eval (ctx, data, size); | |
1405 | ||
cec03d70 | 1406 | in_reg = ctx->location == DWARF_VALUE_REGISTER; |
f630a401 | 1407 | |
87808bd6 JB |
1408 | if (ctx->num_pieces > 0) |
1409 | { | |
1410 | int i; | |
1411 | ||
1412 | /* If the location has several pieces, and any of them are in | |
1413 | registers, then we will need a frame to fetch them from. */ | |
1414 | for (i = 0; i < ctx->num_pieces; i++) | |
cec03d70 | 1415 | if (ctx->pieces[i].location == DWARF_VALUE_REGISTER) |
87808bd6 JB |
1416 | in_reg = 1; |
1417 | } | |
1418 | ||
4a227398 | 1419 | do_cleanups (old_chain); |
4c2df51b | 1420 | |
f630a401 | 1421 | return baton.needs_frame || in_reg; |
4c2df51b DJ |
1422 | } |
1423 | ||
3cf03773 TT |
1424 | /* A helper function that throws an unimplemented error mentioning a |
1425 | given DWARF operator. */ | |
1426 | ||
1427 | static void | |
1428 | unimplemented (unsigned int op) | |
0d53c4c4 | 1429 | { |
b1bfef65 TT |
1430 | const char *name = dwarf_stack_op_name (op); |
1431 | ||
1432 | if (name) | |
1433 | error (_("DWARF operator %s cannot be translated to an agent expression"), | |
1434 | name); | |
1435 | else | |
1ba1b353 TT |
1436 | error (_("Unknown DWARF operator 0x%02x cannot be translated " |
1437 | "to an agent expression"), | |
b1bfef65 | 1438 | op); |
3cf03773 | 1439 | } |
08922a10 | 1440 | |
3cf03773 TT |
1441 | /* A helper function to convert a DWARF register to an arch register. |
1442 | ARCH is the architecture. | |
1443 | DWARF_REG is the register. | |
1444 | This will throw an exception if the DWARF register cannot be | |
1445 | translated to an architecture register. */ | |
08922a10 | 1446 | |
3cf03773 TT |
1447 | static int |
1448 | translate_register (struct gdbarch *arch, int dwarf_reg) | |
1449 | { | |
1450 | int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg); | |
1451 | if (reg == -1) | |
1452 | error (_("Unable to access DWARF register number %d"), dwarf_reg); | |
1453 | return reg; | |
1454 | } | |
08922a10 | 1455 | |
3cf03773 TT |
1456 | /* A helper function that emits an access to memory. ARCH is the |
1457 | target architecture. EXPR is the expression which we are building. | |
1458 | NBITS is the number of bits we want to read. This emits the | |
1459 | opcodes needed to read the memory and then extract the desired | |
1460 | bits. */ | |
08922a10 | 1461 | |
3cf03773 TT |
1462 | static void |
1463 | access_memory (struct gdbarch *arch, struct agent_expr *expr, ULONGEST nbits) | |
08922a10 | 1464 | { |
3cf03773 TT |
1465 | ULONGEST nbytes = (nbits + 7) / 8; |
1466 | ||
1467 | gdb_assert (nbits > 0 && nbits <= sizeof (LONGEST)); | |
1468 | ||
1469 | if (trace_kludge) | |
1470 | ax_trace_quick (expr, nbytes); | |
1471 | ||
1472 | if (nbits <= 8) | |
1473 | ax_simple (expr, aop_ref8); | |
1474 | else if (nbits <= 16) | |
1475 | ax_simple (expr, aop_ref16); | |
1476 | else if (nbits <= 32) | |
1477 | ax_simple (expr, aop_ref32); | |
1478 | else | |
1479 | ax_simple (expr, aop_ref64); | |
1480 | ||
1481 | /* If we read exactly the number of bytes we wanted, we're done. */ | |
1482 | if (8 * nbytes == nbits) | |
1483 | return; | |
1484 | ||
1485 | if (gdbarch_bits_big_endian (arch)) | |
0d53c4c4 | 1486 | { |
3cf03773 TT |
1487 | /* On a bits-big-endian machine, we want the high-order |
1488 | NBITS. */ | |
1489 | ax_const_l (expr, 8 * nbytes - nbits); | |
1490 | ax_simple (expr, aop_rsh_unsigned); | |
0d53c4c4 | 1491 | } |
3cf03773 | 1492 | else |
0d53c4c4 | 1493 | { |
3cf03773 TT |
1494 | /* On a bits-little-endian box, we want the low-order NBITS. */ |
1495 | ax_zero_ext (expr, nbits); | |
0d53c4c4 | 1496 | } |
3cf03773 | 1497 | } |
0936ad1d | 1498 | |
8cf6f0b1 TT |
1499 | /* A helper function to return the frame's PC. */ |
1500 | ||
1501 | static CORE_ADDR | |
1502 | get_ax_pc (void *baton) | |
1503 | { | |
1504 | struct agent_expr *expr = baton; | |
1505 | ||
1506 | return expr->scope; | |
1507 | } | |
1508 | ||
3cf03773 TT |
1509 | /* Compile a DWARF location expression to an agent expression. |
1510 | ||
1511 | EXPR is the agent expression we are building. | |
1512 | LOC is the agent value we modify. | |
1513 | ARCH is the architecture. | |
1514 | ADDR_SIZE is the size of addresses, in bytes. | |
1515 | OP_PTR is the start of the location expression. | |
1516 | OP_END is one past the last byte of the location expression. | |
1517 | ||
1518 | This will throw an exception for various kinds of errors -- for | |
1519 | example, if the expression cannot be compiled, or if the expression | |
1520 | is invalid. */ | |
0936ad1d | 1521 | |
9f6f94ff TT |
1522 | void |
1523 | dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
1524 | struct gdbarch *arch, unsigned int addr_size, | |
1525 | const gdb_byte *op_ptr, const gdb_byte *op_end, | |
1526 | struct dwarf2_per_cu_data *per_cu) | |
3cf03773 TT |
1527 | { |
1528 | struct cleanup *cleanups; | |
1529 | int i, *offsets; | |
1530 | VEC(int) *dw_labels = NULL, *patches = NULL; | |
1531 | const gdb_byte * const base = op_ptr; | |
1532 | const gdb_byte *previous_piece = op_ptr; | |
1533 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
1534 | ULONGEST bits_collected = 0; | |
1535 | unsigned int addr_size_bits = 8 * addr_size; | |
1536 | int bits_big_endian = gdbarch_bits_big_endian (arch); | |
0936ad1d | 1537 | |
3cf03773 TT |
1538 | offsets = xmalloc ((op_end - op_ptr) * sizeof (int)); |
1539 | cleanups = make_cleanup (xfree, offsets); | |
0936ad1d | 1540 | |
3cf03773 TT |
1541 | for (i = 0; i < op_end - op_ptr; ++i) |
1542 | offsets[i] = -1; | |
0936ad1d | 1543 | |
3cf03773 TT |
1544 | make_cleanup (VEC_cleanup (int), &dw_labels); |
1545 | make_cleanup (VEC_cleanup (int), &patches); | |
0936ad1d | 1546 | |
3cf03773 TT |
1547 | /* By default we are making an address. */ |
1548 | loc->kind = axs_lvalue_memory; | |
0d45f56e | 1549 | |
3cf03773 TT |
1550 | while (op_ptr < op_end) |
1551 | { | |
1552 | enum dwarf_location_atom op = *op_ptr; | |
3cf03773 TT |
1553 | ULONGEST uoffset, reg; |
1554 | LONGEST offset; | |
1555 | int i; | |
1556 | ||
1557 | offsets[op_ptr - base] = expr->len; | |
1558 | ++op_ptr; | |
1559 | ||
1560 | /* Our basic approach to code generation is to map DWARF | |
1561 | operations directly to AX operations. However, there are | |
1562 | some differences. | |
1563 | ||
1564 | First, DWARF works on address-sized units, but AX always uses | |
1565 | LONGEST. For most operations we simply ignore this | |
1566 | difference; instead we generate sign extensions as needed | |
1567 | before division and comparison operations. It would be nice | |
1568 | to omit the sign extensions, but there is no way to determine | |
1569 | the size of the target's LONGEST. (This code uses the size | |
1570 | of the host LONGEST in some cases -- that is a bug but it is | |
1571 | difficult to fix.) | |
1572 | ||
1573 | Second, some DWARF operations cannot be translated to AX. | |
1574 | For these we simply fail. See | |
1575 | http://sourceware.org/bugzilla/show_bug.cgi?id=11662. */ | |
1576 | switch (op) | |
0936ad1d | 1577 | { |
3cf03773 TT |
1578 | case DW_OP_lit0: |
1579 | case DW_OP_lit1: | |
1580 | case DW_OP_lit2: | |
1581 | case DW_OP_lit3: | |
1582 | case DW_OP_lit4: | |
1583 | case DW_OP_lit5: | |
1584 | case DW_OP_lit6: | |
1585 | case DW_OP_lit7: | |
1586 | case DW_OP_lit8: | |
1587 | case DW_OP_lit9: | |
1588 | case DW_OP_lit10: | |
1589 | case DW_OP_lit11: | |
1590 | case DW_OP_lit12: | |
1591 | case DW_OP_lit13: | |
1592 | case DW_OP_lit14: | |
1593 | case DW_OP_lit15: | |
1594 | case DW_OP_lit16: | |
1595 | case DW_OP_lit17: | |
1596 | case DW_OP_lit18: | |
1597 | case DW_OP_lit19: | |
1598 | case DW_OP_lit20: | |
1599 | case DW_OP_lit21: | |
1600 | case DW_OP_lit22: | |
1601 | case DW_OP_lit23: | |
1602 | case DW_OP_lit24: | |
1603 | case DW_OP_lit25: | |
1604 | case DW_OP_lit26: | |
1605 | case DW_OP_lit27: | |
1606 | case DW_OP_lit28: | |
1607 | case DW_OP_lit29: | |
1608 | case DW_OP_lit30: | |
1609 | case DW_OP_lit31: | |
1610 | ax_const_l (expr, op - DW_OP_lit0); | |
1611 | break; | |
0d53c4c4 | 1612 | |
3cf03773 | 1613 | case DW_OP_addr: |
ac56253d | 1614 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
3cf03773 | 1615 | op_ptr += addr_size; |
ac56253d TT |
1616 | /* Some versions of GCC emit DW_OP_addr before |
1617 | DW_OP_GNU_push_tls_address. In this case the value is an | |
1618 | index, not an address. We don't support things like | |
1619 | branching between the address and the TLS op. */ | |
1620 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
9aa1f1e3 | 1621 | uoffset += dwarf2_per_cu_text_offset (per_cu); |
ac56253d | 1622 | ax_const_l (expr, uoffset); |
3cf03773 | 1623 | break; |
4c2df51b | 1624 | |
3cf03773 TT |
1625 | case DW_OP_const1u: |
1626 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 1, byte_order)); | |
1627 | op_ptr += 1; | |
1628 | break; | |
1629 | case DW_OP_const1s: | |
1630 | ax_const_l (expr, extract_signed_integer (op_ptr, 1, byte_order)); | |
1631 | op_ptr += 1; | |
1632 | break; | |
1633 | case DW_OP_const2u: | |
1634 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 2, byte_order)); | |
1635 | op_ptr += 2; | |
1636 | break; | |
1637 | case DW_OP_const2s: | |
1638 | ax_const_l (expr, extract_signed_integer (op_ptr, 2, byte_order)); | |
1639 | op_ptr += 2; | |
1640 | break; | |
1641 | case DW_OP_const4u: | |
1642 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 4, byte_order)); | |
1643 | op_ptr += 4; | |
1644 | break; | |
1645 | case DW_OP_const4s: | |
1646 | ax_const_l (expr, extract_signed_integer (op_ptr, 4, byte_order)); | |
1647 | op_ptr += 4; | |
1648 | break; | |
1649 | case DW_OP_const8u: | |
1650 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 8, byte_order)); | |
1651 | op_ptr += 8; | |
1652 | break; | |
1653 | case DW_OP_const8s: | |
1654 | ax_const_l (expr, extract_signed_integer (op_ptr, 8, byte_order)); | |
1655 | op_ptr += 8; | |
1656 | break; | |
1657 | case DW_OP_constu: | |
1658 | op_ptr = read_uleb128 (op_ptr, op_end, &uoffset); | |
1659 | ax_const_l (expr, uoffset); | |
1660 | break; | |
1661 | case DW_OP_consts: | |
1662 | op_ptr = read_sleb128 (op_ptr, op_end, &offset); | |
1663 | ax_const_l (expr, offset); | |
1664 | break; | |
9c238357 | 1665 | |
3cf03773 TT |
1666 | case DW_OP_reg0: |
1667 | case DW_OP_reg1: | |
1668 | case DW_OP_reg2: | |
1669 | case DW_OP_reg3: | |
1670 | case DW_OP_reg4: | |
1671 | case DW_OP_reg5: | |
1672 | case DW_OP_reg6: | |
1673 | case DW_OP_reg7: | |
1674 | case DW_OP_reg8: | |
1675 | case DW_OP_reg9: | |
1676 | case DW_OP_reg10: | |
1677 | case DW_OP_reg11: | |
1678 | case DW_OP_reg12: | |
1679 | case DW_OP_reg13: | |
1680 | case DW_OP_reg14: | |
1681 | case DW_OP_reg15: | |
1682 | case DW_OP_reg16: | |
1683 | case DW_OP_reg17: | |
1684 | case DW_OP_reg18: | |
1685 | case DW_OP_reg19: | |
1686 | case DW_OP_reg20: | |
1687 | case DW_OP_reg21: | |
1688 | case DW_OP_reg22: | |
1689 | case DW_OP_reg23: | |
1690 | case DW_OP_reg24: | |
1691 | case DW_OP_reg25: | |
1692 | case DW_OP_reg26: | |
1693 | case DW_OP_reg27: | |
1694 | case DW_OP_reg28: | |
1695 | case DW_OP_reg29: | |
1696 | case DW_OP_reg30: | |
1697 | case DW_OP_reg31: | |
1698 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
1699 | loc->u.reg = translate_register (arch, op - DW_OP_reg0); | |
1700 | loc->kind = axs_lvalue_register; | |
1701 | break; | |
9c238357 | 1702 | |
3cf03773 TT |
1703 | case DW_OP_regx: |
1704 | op_ptr = read_uleb128 (op_ptr, op_end, ®); | |
1705 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
1706 | loc->u.reg = translate_register (arch, reg); | |
1707 | loc->kind = axs_lvalue_register; | |
1708 | break; | |
08922a10 | 1709 | |
3cf03773 TT |
1710 | case DW_OP_implicit_value: |
1711 | { | |
1712 | ULONGEST len; | |
1713 | ||
1714 | op_ptr = read_uleb128 (op_ptr, op_end, &len); | |
1715 | if (op_ptr + len > op_end) | |
1716 | error (_("DW_OP_implicit_value: too few bytes available.")); | |
1717 | if (len > sizeof (ULONGEST)) | |
1718 | error (_("Cannot translate DW_OP_implicit_value of %d bytes"), | |
1719 | (int) len); | |
1720 | ||
1721 | ax_const_l (expr, extract_unsigned_integer (op_ptr, len, | |
1722 | byte_order)); | |
1723 | op_ptr += len; | |
1724 | dwarf_expr_require_composition (op_ptr, op_end, | |
1725 | "DW_OP_implicit_value"); | |
1726 | ||
1727 | loc->kind = axs_rvalue; | |
1728 | } | |
1729 | break; | |
08922a10 | 1730 | |
3cf03773 TT |
1731 | case DW_OP_stack_value: |
1732 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value"); | |
1733 | loc->kind = axs_rvalue; | |
1734 | break; | |
08922a10 | 1735 | |
3cf03773 TT |
1736 | case DW_OP_breg0: |
1737 | case DW_OP_breg1: | |
1738 | case DW_OP_breg2: | |
1739 | case DW_OP_breg3: | |
1740 | case DW_OP_breg4: | |
1741 | case DW_OP_breg5: | |
1742 | case DW_OP_breg6: | |
1743 | case DW_OP_breg7: | |
1744 | case DW_OP_breg8: | |
1745 | case DW_OP_breg9: | |
1746 | case DW_OP_breg10: | |
1747 | case DW_OP_breg11: | |
1748 | case DW_OP_breg12: | |
1749 | case DW_OP_breg13: | |
1750 | case DW_OP_breg14: | |
1751 | case DW_OP_breg15: | |
1752 | case DW_OP_breg16: | |
1753 | case DW_OP_breg17: | |
1754 | case DW_OP_breg18: | |
1755 | case DW_OP_breg19: | |
1756 | case DW_OP_breg20: | |
1757 | case DW_OP_breg21: | |
1758 | case DW_OP_breg22: | |
1759 | case DW_OP_breg23: | |
1760 | case DW_OP_breg24: | |
1761 | case DW_OP_breg25: | |
1762 | case DW_OP_breg26: | |
1763 | case DW_OP_breg27: | |
1764 | case DW_OP_breg28: | |
1765 | case DW_OP_breg29: | |
1766 | case DW_OP_breg30: | |
1767 | case DW_OP_breg31: | |
1768 | op_ptr = read_sleb128 (op_ptr, op_end, &offset); | |
1769 | i = translate_register (arch, op - DW_OP_breg0); | |
1770 | ax_reg (expr, i); | |
1771 | if (offset != 0) | |
1772 | { | |
1773 | ax_const_l (expr, offset); | |
1774 | ax_simple (expr, aop_add); | |
1775 | } | |
1776 | break; | |
1777 | case DW_OP_bregx: | |
1778 | { | |
1779 | op_ptr = read_uleb128 (op_ptr, op_end, ®); | |
1780 | op_ptr = read_sleb128 (op_ptr, op_end, &offset); | |
1781 | i = translate_register (arch, reg); | |
1782 | ax_reg (expr, i); | |
1783 | if (offset != 0) | |
1784 | { | |
1785 | ax_const_l (expr, offset); | |
1786 | ax_simple (expr, aop_add); | |
1787 | } | |
1788 | } | |
1789 | break; | |
1790 | case DW_OP_fbreg: | |
1791 | { | |
1792 | const gdb_byte *datastart; | |
1793 | size_t datalen; | |
1794 | unsigned int before_stack_len; | |
1795 | struct block *b; | |
1796 | struct symbol *framefunc; | |
1797 | LONGEST base_offset = 0; | |
08922a10 | 1798 | |
3cf03773 TT |
1799 | b = block_for_pc (expr->scope); |
1800 | ||
1801 | if (!b) | |
1802 | error (_("No block found for address")); | |
1803 | ||
1804 | framefunc = block_linkage_function (b); | |
1805 | ||
1806 | if (!framefunc) | |
1807 | error (_("No function found for block")); | |
1808 | ||
1809 | dwarf_expr_frame_base_1 (framefunc, expr->scope, | |
1810 | &datastart, &datalen); | |
1811 | ||
1812 | op_ptr = read_sleb128 (op_ptr, op_end, &offset); | |
9f6f94ff TT |
1813 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, datastart, |
1814 | datastart + datalen, per_cu); | |
3cf03773 TT |
1815 | |
1816 | if (offset != 0) | |
1817 | { | |
1818 | ax_const_l (expr, offset); | |
1819 | ax_simple (expr, aop_add); | |
1820 | } | |
1821 | ||
1822 | loc->kind = axs_lvalue_memory; | |
1823 | } | |
08922a10 | 1824 | break; |
08922a10 | 1825 | |
3cf03773 TT |
1826 | case DW_OP_dup: |
1827 | ax_simple (expr, aop_dup); | |
1828 | break; | |
08922a10 | 1829 | |
3cf03773 TT |
1830 | case DW_OP_drop: |
1831 | ax_simple (expr, aop_pop); | |
1832 | break; | |
08922a10 | 1833 | |
3cf03773 TT |
1834 | case DW_OP_pick: |
1835 | offset = *op_ptr++; | |
c7f96d2b | 1836 | ax_pick (expr, offset); |
3cf03773 TT |
1837 | break; |
1838 | ||
1839 | case DW_OP_swap: | |
1840 | ax_simple (expr, aop_swap); | |
1841 | break; | |
08922a10 | 1842 | |
3cf03773 | 1843 | case DW_OP_over: |
c7f96d2b | 1844 | ax_pick (expr, 1); |
3cf03773 | 1845 | break; |
08922a10 | 1846 | |
3cf03773 | 1847 | case DW_OP_rot: |
c7f96d2b | 1848 | ax_simple (expr, aop_rot); |
3cf03773 | 1849 | break; |
08922a10 | 1850 | |
3cf03773 TT |
1851 | case DW_OP_deref: |
1852 | case DW_OP_deref_size: | |
1853 | { | |
1854 | int size; | |
08922a10 | 1855 | |
3cf03773 TT |
1856 | if (op == DW_OP_deref_size) |
1857 | size = *op_ptr++; | |
1858 | else | |
1859 | size = addr_size; | |
1860 | ||
1861 | switch (size) | |
1862 | { | |
1863 | case 8: | |
1864 | ax_simple (expr, aop_ref8); | |
1865 | break; | |
1866 | case 16: | |
1867 | ax_simple (expr, aop_ref16); | |
1868 | break; | |
1869 | case 32: | |
1870 | ax_simple (expr, aop_ref32); | |
1871 | break; | |
1872 | case 64: | |
1873 | ax_simple (expr, aop_ref64); | |
1874 | break; | |
1875 | default: | |
b1bfef65 TT |
1876 | /* Note that dwarf_stack_op_name will never return |
1877 | NULL here. */ | |
3cf03773 | 1878 | error (_("Unsupported size %d in %s"), |
b1bfef65 | 1879 | size, dwarf_stack_op_name (op)); |
3cf03773 TT |
1880 | } |
1881 | } | |
1882 | break; | |
1883 | ||
1884 | case DW_OP_abs: | |
1885 | /* Sign extend the operand. */ | |
1886 | ax_ext (expr, addr_size_bits); | |
1887 | ax_simple (expr, aop_dup); | |
1888 | ax_const_l (expr, 0); | |
1889 | ax_simple (expr, aop_less_signed); | |
1890 | ax_simple (expr, aop_log_not); | |
1891 | i = ax_goto (expr, aop_if_goto); | |
1892 | /* We have to emit 0 - X. */ | |
1893 | ax_const_l (expr, 0); | |
1894 | ax_simple (expr, aop_swap); | |
1895 | ax_simple (expr, aop_sub); | |
1896 | ax_label (expr, i, expr->len); | |
1897 | break; | |
1898 | ||
1899 | case DW_OP_neg: | |
1900 | /* No need to sign extend here. */ | |
1901 | ax_const_l (expr, 0); | |
1902 | ax_simple (expr, aop_swap); | |
1903 | ax_simple (expr, aop_sub); | |
1904 | break; | |
1905 | ||
1906 | case DW_OP_not: | |
1907 | /* Sign extend the operand. */ | |
1908 | ax_ext (expr, addr_size_bits); | |
1909 | ax_simple (expr, aop_bit_not); | |
1910 | break; | |
1911 | ||
1912 | case DW_OP_plus_uconst: | |
1913 | op_ptr = read_uleb128 (op_ptr, op_end, ®); | |
1914 | /* It would be really weird to emit `DW_OP_plus_uconst 0', | |
1915 | but we micro-optimize anyhow. */ | |
1916 | if (reg != 0) | |
1917 | { | |
1918 | ax_const_l (expr, reg); | |
1919 | ax_simple (expr, aop_add); | |
1920 | } | |
1921 | break; | |
1922 | ||
1923 | case DW_OP_and: | |
1924 | ax_simple (expr, aop_bit_and); | |
1925 | break; | |
1926 | ||
1927 | case DW_OP_div: | |
1928 | /* Sign extend the operands. */ | |
1929 | ax_ext (expr, addr_size_bits); | |
1930 | ax_simple (expr, aop_swap); | |
1931 | ax_ext (expr, addr_size_bits); | |
1932 | ax_simple (expr, aop_swap); | |
1933 | ax_simple (expr, aop_div_signed); | |
08922a10 SS |
1934 | break; |
1935 | ||
3cf03773 TT |
1936 | case DW_OP_minus: |
1937 | ax_simple (expr, aop_sub); | |
1938 | break; | |
1939 | ||
1940 | case DW_OP_mod: | |
1941 | ax_simple (expr, aop_rem_unsigned); | |
1942 | break; | |
1943 | ||
1944 | case DW_OP_mul: | |
1945 | ax_simple (expr, aop_mul); | |
1946 | break; | |
1947 | ||
1948 | case DW_OP_or: | |
1949 | ax_simple (expr, aop_bit_or); | |
1950 | break; | |
1951 | ||
1952 | case DW_OP_plus: | |
1953 | ax_simple (expr, aop_add); | |
1954 | break; | |
1955 | ||
1956 | case DW_OP_shl: | |
1957 | ax_simple (expr, aop_lsh); | |
1958 | break; | |
1959 | ||
1960 | case DW_OP_shr: | |
1961 | ax_simple (expr, aop_rsh_unsigned); | |
1962 | break; | |
1963 | ||
1964 | case DW_OP_shra: | |
1965 | ax_simple (expr, aop_rsh_signed); | |
1966 | break; | |
1967 | ||
1968 | case DW_OP_xor: | |
1969 | ax_simple (expr, aop_bit_xor); | |
1970 | break; | |
1971 | ||
1972 | case DW_OP_le: | |
1973 | /* Sign extend the operands. */ | |
1974 | ax_ext (expr, addr_size_bits); | |
1975 | ax_simple (expr, aop_swap); | |
1976 | ax_ext (expr, addr_size_bits); | |
1977 | /* Note no swap here: A <= B is !(B < A). */ | |
1978 | ax_simple (expr, aop_less_signed); | |
1979 | ax_simple (expr, aop_log_not); | |
1980 | break; | |
1981 | ||
1982 | case DW_OP_ge: | |
1983 | /* Sign extend the operands. */ | |
1984 | ax_ext (expr, addr_size_bits); | |
1985 | ax_simple (expr, aop_swap); | |
1986 | ax_ext (expr, addr_size_bits); | |
1987 | ax_simple (expr, aop_swap); | |
1988 | /* A >= B is !(A < B). */ | |
1989 | ax_simple (expr, aop_less_signed); | |
1990 | ax_simple (expr, aop_log_not); | |
1991 | break; | |
1992 | ||
1993 | case DW_OP_eq: | |
1994 | /* Sign extend the operands. */ | |
1995 | ax_ext (expr, addr_size_bits); | |
1996 | ax_simple (expr, aop_swap); | |
1997 | ax_ext (expr, addr_size_bits); | |
1998 | /* No need for a second swap here. */ | |
1999 | ax_simple (expr, aop_equal); | |
2000 | break; | |
2001 | ||
2002 | case DW_OP_lt: | |
2003 | /* Sign extend the operands. */ | |
2004 | ax_ext (expr, addr_size_bits); | |
2005 | ax_simple (expr, aop_swap); | |
2006 | ax_ext (expr, addr_size_bits); | |
2007 | ax_simple (expr, aop_swap); | |
2008 | ax_simple (expr, aop_less_signed); | |
2009 | break; | |
2010 | ||
2011 | case DW_OP_gt: | |
2012 | /* Sign extend the operands. */ | |
2013 | ax_ext (expr, addr_size_bits); | |
2014 | ax_simple (expr, aop_swap); | |
2015 | ax_ext (expr, addr_size_bits); | |
2016 | /* Note no swap here: A > B is B < A. */ | |
2017 | ax_simple (expr, aop_less_signed); | |
2018 | break; | |
2019 | ||
2020 | case DW_OP_ne: | |
2021 | /* Sign extend the operands. */ | |
2022 | ax_ext (expr, addr_size_bits); | |
2023 | ax_simple (expr, aop_swap); | |
2024 | ax_ext (expr, addr_size_bits); | |
2025 | /* No need for a swap here. */ | |
2026 | ax_simple (expr, aop_equal); | |
2027 | ax_simple (expr, aop_log_not); | |
2028 | break; | |
2029 | ||
2030 | case DW_OP_call_frame_cfa: | |
9f6f94ff TT |
2031 | dwarf2_compile_cfa_to_ax (expr, loc, arch, expr->scope, per_cu); |
2032 | loc->kind = axs_lvalue_memory; | |
3cf03773 TT |
2033 | break; |
2034 | ||
2035 | case DW_OP_GNU_push_tls_address: | |
2036 | unimplemented (op); | |
2037 | break; | |
2038 | ||
2039 | case DW_OP_skip: | |
2040 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
2041 | op_ptr += 2; | |
2042 | i = ax_goto (expr, aop_goto); | |
2043 | VEC_safe_push (int, dw_labels, op_ptr + offset - base); | |
2044 | VEC_safe_push (int, patches, i); | |
2045 | break; | |
2046 | ||
2047 | case DW_OP_bra: | |
2048 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
2049 | op_ptr += 2; | |
2050 | /* Zero extend the operand. */ | |
2051 | ax_zero_ext (expr, addr_size_bits); | |
2052 | i = ax_goto (expr, aop_if_goto); | |
2053 | VEC_safe_push (int, dw_labels, op_ptr + offset - base); | |
2054 | VEC_safe_push (int, patches, i); | |
2055 | break; | |
2056 | ||
2057 | case DW_OP_nop: | |
2058 | break; | |
2059 | ||
2060 | case DW_OP_piece: | |
2061 | case DW_OP_bit_piece: | |
08922a10 | 2062 | { |
3cf03773 TT |
2063 | ULONGEST size, offset; |
2064 | ||
2065 | if (op_ptr - 1 == previous_piece) | |
2066 | error (_("Cannot translate empty pieces to agent expressions")); | |
2067 | previous_piece = op_ptr - 1; | |
2068 | ||
2069 | op_ptr = read_uleb128 (op_ptr, op_end, &size); | |
2070 | if (op == DW_OP_piece) | |
2071 | { | |
2072 | size *= 8; | |
2073 | offset = 0; | |
2074 | } | |
2075 | else | |
2076 | op_ptr = read_uleb128 (op_ptr, op_end, &offset); | |
08922a10 | 2077 | |
3cf03773 TT |
2078 | if (bits_collected + size > 8 * sizeof (LONGEST)) |
2079 | error (_("Expression pieces exceed word size")); | |
2080 | ||
2081 | /* Access the bits. */ | |
2082 | switch (loc->kind) | |
2083 | { | |
2084 | case axs_lvalue_register: | |
2085 | ax_reg (expr, loc->u.reg); | |
2086 | break; | |
2087 | ||
2088 | case axs_lvalue_memory: | |
2089 | /* Offset the pointer, if needed. */ | |
2090 | if (offset > 8) | |
2091 | { | |
2092 | ax_const_l (expr, offset / 8); | |
2093 | ax_simple (expr, aop_add); | |
2094 | offset %= 8; | |
2095 | } | |
2096 | access_memory (arch, expr, size); | |
2097 | break; | |
2098 | } | |
2099 | ||
2100 | /* For a bits-big-endian target, shift up what we already | |
2101 | have. For a bits-little-endian target, shift up the | |
2102 | new data. Note that there is a potential bug here if | |
2103 | the DWARF expression leaves multiple values on the | |
2104 | stack. */ | |
2105 | if (bits_collected > 0) | |
2106 | { | |
2107 | if (bits_big_endian) | |
2108 | { | |
2109 | ax_simple (expr, aop_swap); | |
2110 | ax_const_l (expr, size); | |
2111 | ax_simple (expr, aop_lsh); | |
2112 | /* We don't need a second swap here, because | |
2113 | aop_bit_or is symmetric. */ | |
2114 | } | |
2115 | else | |
2116 | { | |
2117 | ax_const_l (expr, size); | |
2118 | ax_simple (expr, aop_lsh); | |
2119 | } | |
2120 | ax_simple (expr, aop_bit_or); | |
2121 | } | |
2122 | ||
2123 | bits_collected += size; | |
2124 | loc->kind = axs_rvalue; | |
08922a10 SS |
2125 | } |
2126 | break; | |
08922a10 | 2127 | |
3cf03773 TT |
2128 | case DW_OP_GNU_uninit: |
2129 | unimplemented (op); | |
2130 | ||
2131 | case DW_OP_call2: | |
2132 | case DW_OP_call4: | |
2133 | { | |
2134 | struct dwarf2_locexpr_baton block; | |
2135 | int size = (op == DW_OP_call2 ? 2 : 4); | |
918dd910 | 2136 | struct cleanup *back_to; |
3cf03773 TT |
2137 | |
2138 | uoffset = extract_unsigned_integer (op_ptr, size, byte_order); | |
2139 | op_ptr += size; | |
2140 | ||
8cf6f0b1 TT |
2141 | block = dwarf2_fetch_die_location_block (uoffset, per_cu, |
2142 | get_ax_pc, expr); | |
918dd910 | 2143 | back_to = make_cleanup (xfree, (void *) block.data); |
3cf03773 TT |
2144 | |
2145 | /* DW_OP_call_ref is currently not supported. */ | |
2146 | gdb_assert (block.per_cu == per_cu); | |
2147 | ||
9f6f94ff TT |
2148 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, |
2149 | block.data, block.data + block.size, | |
2150 | per_cu); | |
918dd910 JK |
2151 | |
2152 | do_cleanups (back_to); | |
3cf03773 TT |
2153 | } |
2154 | break; | |
2155 | ||
2156 | case DW_OP_call_ref: | |
2157 | unimplemented (op); | |
2158 | ||
2159 | default: | |
b1bfef65 | 2160 | unimplemented (op); |
08922a10 | 2161 | } |
08922a10 | 2162 | } |
3cf03773 TT |
2163 | |
2164 | /* Patch all the branches we emitted. */ | |
2165 | for (i = 0; i < VEC_length (int, patches); ++i) | |
2166 | { | |
2167 | int targ = offsets[VEC_index (int, dw_labels, i)]; | |
2168 | if (targ == -1) | |
2169 | internal_error (__FILE__, __LINE__, _("invalid label")); | |
2170 | ax_label (expr, VEC_index (int, patches, i), targ); | |
2171 | } | |
2172 | ||
2173 | do_cleanups (cleanups); | |
08922a10 SS |
2174 | } |
2175 | ||
4c2df51b DJ |
2176 | \f |
2177 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
2178 | evaluator to calculate the location. */ | |
2179 | static struct value * | |
2180 | locexpr_read_variable (struct symbol *symbol, struct frame_info *frame) | |
2181 | { | |
2182 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
2183 | struct value *val; | |
9a619af0 | 2184 | |
a2d33775 JK |
2185 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data, |
2186 | dlbaton->size, dlbaton->per_cu); | |
4c2df51b DJ |
2187 | |
2188 | return val; | |
2189 | } | |
2190 | ||
2191 | /* Return non-zero iff we need a frame to evaluate SYMBOL. */ | |
2192 | static int | |
2193 | locexpr_read_needs_frame (struct symbol *symbol) | |
2194 | { | |
2195 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
9a619af0 | 2196 | |
ae0d2f24 UW |
2197 | return dwarf2_loc_desc_needs_frame (dlbaton->data, dlbaton->size, |
2198 | dlbaton->per_cu); | |
4c2df51b DJ |
2199 | } |
2200 | ||
9eae7c52 TT |
2201 | /* Return true if DATA points to the end of a piece. END is one past |
2202 | the last byte in the expression. */ | |
2203 | ||
2204 | static int | |
2205 | piece_end_p (const gdb_byte *data, const gdb_byte *end) | |
2206 | { | |
2207 | return data == end || data[0] == DW_OP_piece || data[0] == DW_OP_bit_piece; | |
2208 | } | |
2209 | ||
5e44ecb3 TT |
2210 | /* Helper for locexpr_describe_location_piece that finds the name of a |
2211 | DWARF register. */ | |
2212 | ||
2213 | static const char * | |
2214 | locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum) | |
2215 | { | |
2216 | int regnum; | |
2217 | ||
2218 | regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_regnum); | |
2219 | return gdbarch_register_name (gdbarch, regnum); | |
2220 | } | |
2221 | ||
9eae7c52 TT |
2222 | /* Nicely describe a single piece of a location, returning an updated |
2223 | position in the bytecode sequence. This function cannot recognize | |
2224 | all locations; if a location is not recognized, it simply returns | |
2225 | DATA. */ | |
08922a10 | 2226 | |
0d45f56e | 2227 | static const gdb_byte * |
08922a10 SS |
2228 | locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream, |
2229 | CORE_ADDR addr, struct objfile *objfile, | |
9eae7c52 | 2230 | const gdb_byte *data, const gdb_byte *end, |
0d45f56e | 2231 | unsigned int addr_size) |
4c2df51b | 2232 | { |
08922a10 | 2233 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
08922a10 SS |
2234 | |
2235 | if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31) | |
2236 | { | |
08922a10 | 2237 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 2238 | locexpr_regname (gdbarch, data[0] - DW_OP_reg0)); |
08922a10 SS |
2239 | data += 1; |
2240 | } | |
2241 | else if (data[0] == DW_OP_regx) | |
2242 | { | |
2243 | ULONGEST reg; | |
4c2df51b | 2244 | |
9eae7c52 | 2245 | data = read_uleb128 (data + 1, end, ®); |
08922a10 | 2246 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 2247 | locexpr_regname (gdbarch, reg)); |
08922a10 SS |
2248 | } |
2249 | else if (data[0] == DW_OP_fbreg) | |
4c2df51b | 2250 | { |
08922a10 SS |
2251 | struct block *b; |
2252 | struct symbol *framefunc; | |
2253 | int frame_reg = 0; | |
2254 | LONGEST frame_offset; | |
7155d578 | 2255 | const gdb_byte *base_data, *new_data, *save_data = data; |
08922a10 SS |
2256 | size_t base_size; |
2257 | LONGEST base_offset = 0; | |
2258 | ||
9eae7c52 TT |
2259 | new_data = read_sleb128 (data + 1, end, &frame_offset); |
2260 | if (!piece_end_p (new_data, end)) | |
2261 | return data; | |
2262 | data = new_data; | |
2263 | ||
08922a10 SS |
2264 | b = block_for_pc (addr); |
2265 | ||
2266 | if (!b) | |
2267 | error (_("No block found for address for symbol \"%s\"."), | |
2268 | SYMBOL_PRINT_NAME (symbol)); | |
2269 | ||
2270 | framefunc = block_linkage_function (b); | |
2271 | ||
2272 | if (!framefunc) | |
2273 | error (_("No function found for block for symbol \"%s\"."), | |
2274 | SYMBOL_PRINT_NAME (symbol)); | |
2275 | ||
2276 | dwarf_expr_frame_base_1 (framefunc, addr, &base_data, &base_size); | |
2277 | ||
2278 | if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31) | |
2279 | { | |
0d45f56e | 2280 | const gdb_byte *buf_end; |
08922a10 SS |
2281 | |
2282 | frame_reg = base_data[0] - DW_OP_breg0; | |
2283 | buf_end = read_sleb128 (base_data + 1, | |
2284 | base_data + base_size, &base_offset); | |
2285 | if (buf_end != base_data + base_size) | |
3e43a32a MS |
2286 | error (_("Unexpected opcode after " |
2287 | "DW_OP_breg%u for symbol \"%s\"."), | |
08922a10 SS |
2288 | frame_reg, SYMBOL_PRINT_NAME (symbol)); |
2289 | } | |
2290 | else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31) | |
2291 | { | |
2292 | /* The frame base is just the register, with no offset. */ | |
2293 | frame_reg = base_data[0] - DW_OP_reg0; | |
2294 | base_offset = 0; | |
2295 | } | |
2296 | else | |
2297 | { | |
2298 | /* We don't know what to do with the frame base expression, | |
2299 | so we can't trace this variable; give up. */ | |
7155d578 | 2300 | return save_data; |
08922a10 SS |
2301 | } |
2302 | ||
3e43a32a MS |
2303 | fprintf_filtered (stream, |
2304 | _("a variable at frame base reg $%s offset %s+%s"), | |
5e44ecb3 | 2305 | locexpr_regname (gdbarch, frame_reg), |
08922a10 SS |
2306 | plongest (base_offset), plongest (frame_offset)); |
2307 | } | |
9eae7c52 TT |
2308 | else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31 |
2309 | && piece_end_p (data, end)) | |
08922a10 SS |
2310 | { |
2311 | LONGEST offset; | |
2312 | ||
9eae7c52 | 2313 | data = read_sleb128 (data + 1, end, &offset); |
08922a10 | 2314 | |
4c2df51b | 2315 | fprintf_filtered (stream, |
08922a10 SS |
2316 | _("a variable at offset %s from base reg $%s"), |
2317 | plongest (offset), | |
5e44ecb3 | 2318 | locexpr_regname (gdbarch, data[0] - DW_OP_breg0)); |
4c2df51b DJ |
2319 | } |
2320 | ||
c3228f12 EZ |
2321 | /* The location expression for a TLS variable looks like this (on a |
2322 | 64-bit LE machine): | |
2323 | ||
2324 | DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0 | |
2325 | (DW_OP_addr: 4; DW_OP_GNU_push_tls_address) | |
09d8bd00 | 2326 | |
c3228f12 EZ |
2327 | 0x3 is the encoding for DW_OP_addr, which has an operand as long |
2328 | as the size of an address on the target machine (here is 8 | |
09d8bd00 TT |
2329 | bytes). Note that more recent version of GCC emit DW_OP_const4u |
2330 | or DW_OP_const8u, depending on address size, rather than | |
0963b4bd MS |
2331 | DW_OP_addr. 0xe0 is the encoding for DW_OP_GNU_push_tls_address. |
2332 | The operand represents the offset at which the variable is within | |
2333 | the thread local storage. */ | |
c3228f12 | 2334 | |
9eae7c52 | 2335 | else if (data + 1 + addr_size < end |
09d8bd00 TT |
2336 | && (data[0] == DW_OP_addr |
2337 | || (addr_size == 4 && data[0] == DW_OP_const4u) | |
2338 | || (addr_size == 8 && data[0] == DW_OP_const8u)) | |
9eae7c52 TT |
2339 | && data[1 + addr_size] == DW_OP_GNU_push_tls_address |
2340 | && piece_end_p (data + 2 + addr_size, end)) | |
08922a10 | 2341 | { |
d4a087c7 UW |
2342 | ULONGEST offset; |
2343 | offset = extract_unsigned_integer (data + 1, addr_size, | |
2344 | gdbarch_byte_order (gdbarch)); | |
9a619af0 | 2345 | |
08922a10 | 2346 | fprintf_filtered (stream, |
d4a087c7 | 2347 | _("a thread-local variable at offset 0x%s " |
08922a10 | 2348 | "in the thread-local storage for `%s'"), |
d4a087c7 | 2349 | phex_nz (offset, addr_size), objfile->name); |
08922a10 SS |
2350 | |
2351 | data += 1 + addr_size + 1; | |
2352 | } | |
9eae7c52 TT |
2353 | else if (data[0] >= DW_OP_lit0 |
2354 | && data[0] <= DW_OP_lit31 | |
2355 | && data + 1 < end | |
2356 | && data[1] == DW_OP_stack_value) | |
2357 | { | |
2358 | fprintf_filtered (stream, _("the constant %d"), data[0] - DW_OP_lit0); | |
2359 | data += 2; | |
2360 | } | |
2361 | ||
2362 | return data; | |
2363 | } | |
2364 | ||
2365 | /* Disassemble an expression, stopping at the end of a piece or at the | |
2366 | end of the expression. Returns a pointer to the next unread byte | |
2367 | in the input expression. If ALL is nonzero, then this function | |
2368 | will keep going until it reaches the end of the expression. */ | |
2369 | ||
2370 | static const gdb_byte * | |
2371 | disassemble_dwarf_expression (struct ui_file *stream, | |
2372 | struct gdbarch *arch, unsigned int addr_size, | |
2373 | int offset_size, | |
2374 | const gdb_byte *data, const gdb_byte *end, | |
5e44ecb3 TT |
2375 | int all, |
2376 | struct dwarf2_per_cu_data *per_cu) | |
9eae7c52 TT |
2377 | { |
2378 | const gdb_byte *start = data; | |
2379 | ||
2380 | fprintf_filtered (stream, _("a complex DWARF expression:\n")); | |
2381 | ||
2382 | while (data < end | |
2383 | && (all | |
2384 | || (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece))) | |
2385 | { | |
2386 | enum dwarf_location_atom op = *data++; | |
9eae7c52 TT |
2387 | ULONGEST ul; |
2388 | LONGEST l; | |
2389 | const char *name; | |
2390 | ||
b1bfef65 | 2391 | name = dwarf_stack_op_name (op); |
9eae7c52 TT |
2392 | |
2393 | if (!name) | |
2394 | error (_("Unrecognized DWARF opcode 0x%02x at %ld"), | |
06826322 TT |
2395 | op, (long) (data - 1 - start)); |
2396 | fprintf_filtered (stream, " % 4ld: %s", (long) (data - 1 - start), name); | |
9eae7c52 TT |
2397 | |
2398 | switch (op) | |
2399 | { | |
2400 | case DW_OP_addr: | |
d4a087c7 UW |
2401 | ul = extract_unsigned_integer (data, addr_size, |
2402 | gdbarch_byte_order (arch)); | |
9eae7c52 | 2403 | data += addr_size; |
d4a087c7 | 2404 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); |
9eae7c52 TT |
2405 | break; |
2406 | ||
2407 | case DW_OP_const1u: | |
2408 | ul = extract_unsigned_integer (data, 1, gdbarch_byte_order (arch)); | |
2409 | data += 1; | |
2410 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
2411 | break; | |
2412 | case DW_OP_const1s: | |
2413 | l = extract_signed_integer (data, 1, gdbarch_byte_order (arch)); | |
2414 | data += 1; | |
2415 | fprintf_filtered (stream, " %s", plongest (l)); | |
2416 | break; | |
2417 | case DW_OP_const2u: | |
2418 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
2419 | data += 2; | |
2420 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
2421 | break; | |
2422 | case DW_OP_const2s: | |
2423 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
2424 | data += 2; | |
2425 | fprintf_filtered (stream, " %s", plongest (l)); | |
2426 | break; | |
2427 | case DW_OP_const4u: | |
2428 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
2429 | data += 4; | |
2430 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
2431 | break; | |
2432 | case DW_OP_const4s: | |
2433 | l = extract_signed_integer (data, 4, gdbarch_byte_order (arch)); | |
2434 | data += 4; | |
2435 | fprintf_filtered (stream, " %s", plongest (l)); | |
2436 | break; | |
2437 | case DW_OP_const8u: | |
2438 | ul = extract_unsigned_integer (data, 8, gdbarch_byte_order (arch)); | |
2439 | data += 8; | |
2440 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
2441 | break; | |
2442 | case DW_OP_const8s: | |
2443 | l = extract_signed_integer (data, 8, gdbarch_byte_order (arch)); | |
2444 | data += 8; | |
2445 | fprintf_filtered (stream, " %s", plongest (l)); | |
2446 | break; | |
2447 | case DW_OP_constu: | |
2448 | data = read_uleb128 (data, end, &ul); | |
2449 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
2450 | break; | |
2451 | case DW_OP_consts: | |
44b5680a | 2452 | data = read_sleb128 (data, end, &l); |
9eae7c52 TT |
2453 | fprintf_filtered (stream, " %s", plongest (l)); |
2454 | break; | |
2455 | ||
2456 | case DW_OP_reg0: | |
2457 | case DW_OP_reg1: | |
2458 | case DW_OP_reg2: | |
2459 | case DW_OP_reg3: | |
2460 | case DW_OP_reg4: | |
2461 | case DW_OP_reg5: | |
2462 | case DW_OP_reg6: | |
2463 | case DW_OP_reg7: | |
2464 | case DW_OP_reg8: | |
2465 | case DW_OP_reg9: | |
2466 | case DW_OP_reg10: | |
2467 | case DW_OP_reg11: | |
2468 | case DW_OP_reg12: | |
2469 | case DW_OP_reg13: | |
2470 | case DW_OP_reg14: | |
2471 | case DW_OP_reg15: | |
2472 | case DW_OP_reg16: | |
2473 | case DW_OP_reg17: | |
2474 | case DW_OP_reg18: | |
2475 | case DW_OP_reg19: | |
2476 | case DW_OP_reg20: | |
2477 | case DW_OP_reg21: | |
2478 | case DW_OP_reg22: | |
2479 | case DW_OP_reg23: | |
2480 | case DW_OP_reg24: | |
2481 | case DW_OP_reg25: | |
2482 | case DW_OP_reg26: | |
2483 | case DW_OP_reg27: | |
2484 | case DW_OP_reg28: | |
2485 | case DW_OP_reg29: | |
2486 | case DW_OP_reg30: | |
2487 | case DW_OP_reg31: | |
2488 | fprintf_filtered (stream, " [$%s]", | |
5e44ecb3 | 2489 | locexpr_regname (arch, op - DW_OP_reg0)); |
9eae7c52 TT |
2490 | break; |
2491 | ||
2492 | case DW_OP_regx: | |
2493 | data = read_uleb128 (data, end, &ul); | |
2494 | fprintf_filtered (stream, " %s [$%s]", pulongest (ul), | |
5e44ecb3 | 2495 | locexpr_regname (arch, (int) ul)); |
9eae7c52 TT |
2496 | break; |
2497 | ||
2498 | case DW_OP_implicit_value: | |
2499 | data = read_uleb128 (data, end, &ul); | |
2500 | data += ul; | |
2501 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
2502 | break; | |
2503 | ||
2504 | case DW_OP_breg0: | |
2505 | case DW_OP_breg1: | |
2506 | case DW_OP_breg2: | |
2507 | case DW_OP_breg3: | |
2508 | case DW_OP_breg4: | |
2509 | case DW_OP_breg5: | |
2510 | case DW_OP_breg6: | |
2511 | case DW_OP_breg7: | |
2512 | case DW_OP_breg8: | |
2513 | case DW_OP_breg9: | |
2514 | case DW_OP_breg10: | |
2515 | case DW_OP_breg11: | |
2516 | case DW_OP_breg12: | |
2517 | case DW_OP_breg13: | |
2518 | case DW_OP_breg14: | |
2519 | case DW_OP_breg15: | |
2520 | case DW_OP_breg16: | |
2521 | case DW_OP_breg17: | |
2522 | case DW_OP_breg18: | |
2523 | case DW_OP_breg19: | |
2524 | case DW_OP_breg20: | |
2525 | case DW_OP_breg21: | |
2526 | case DW_OP_breg22: | |
2527 | case DW_OP_breg23: | |
2528 | case DW_OP_breg24: | |
2529 | case DW_OP_breg25: | |
2530 | case DW_OP_breg26: | |
2531 | case DW_OP_breg27: | |
2532 | case DW_OP_breg28: | |
2533 | case DW_OP_breg29: | |
2534 | case DW_OP_breg30: | |
2535 | case DW_OP_breg31: | |
0502ed8c JK |
2536 | data = read_sleb128 (data, end, &l); |
2537 | fprintf_filtered (stream, " %s [$%s]", plongest (l), | |
5e44ecb3 | 2538 | locexpr_regname (arch, op - DW_OP_breg0)); |
9eae7c52 TT |
2539 | break; |
2540 | ||
2541 | case DW_OP_bregx: | |
0502ed8c JK |
2542 | data = read_uleb128 (data, end, &ul); |
2543 | data = read_sleb128 (data, end, &l); | |
2544 | fprintf_filtered (stream, " register %s [$%s] offset %s", | |
2545 | pulongest (ul), | |
5e44ecb3 | 2546 | locexpr_regname (arch, (int) ul), |
0502ed8c | 2547 | plongest (l)); |
9eae7c52 TT |
2548 | break; |
2549 | ||
2550 | case DW_OP_fbreg: | |
0502ed8c JK |
2551 | data = read_sleb128 (data, end, &l); |
2552 | fprintf_filtered (stream, " %s", plongest (l)); | |
9eae7c52 TT |
2553 | break; |
2554 | ||
2555 | case DW_OP_xderef_size: | |
2556 | case DW_OP_deref_size: | |
2557 | case DW_OP_pick: | |
2558 | fprintf_filtered (stream, " %d", *data); | |
2559 | ++data; | |
2560 | break; | |
2561 | ||
2562 | case DW_OP_plus_uconst: | |
2563 | data = read_uleb128 (data, end, &ul); | |
2564 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
2565 | break; | |
2566 | ||
2567 | case DW_OP_skip: | |
2568 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
2569 | data += 2; | |
2570 | fprintf_filtered (stream, " to %ld", | |
2571 | (long) (data + l - start)); | |
2572 | break; | |
2573 | ||
2574 | case DW_OP_bra: | |
2575 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
2576 | data += 2; | |
2577 | fprintf_filtered (stream, " %ld", | |
2578 | (long) (data + l - start)); | |
2579 | break; | |
2580 | ||
2581 | case DW_OP_call2: | |
2582 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
2583 | data += 2; | |
2584 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 2)); | |
2585 | break; | |
2586 | ||
2587 | case DW_OP_call4: | |
2588 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
2589 | data += 4; | |
2590 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
2591 | break; | |
2592 | ||
2593 | case DW_OP_call_ref: | |
2594 | ul = extract_unsigned_integer (data, offset_size, | |
2595 | gdbarch_byte_order (arch)); | |
2596 | data += offset_size; | |
2597 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
2598 | break; | |
2599 | ||
2600 | case DW_OP_piece: | |
2601 | data = read_uleb128 (data, end, &ul); | |
2602 | fprintf_filtered (stream, " %s (bytes)", pulongest (ul)); | |
2603 | break; | |
2604 | ||
2605 | case DW_OP_bit_piece: | |
2606 | { | |
2607 | ULONGEST offset; | |
2608 | ||
2609 | data = read_uleb128 (data, end, &ul); | |
2610 | data = read_uleb128 (data, end, &offset); | |
2611 | fprintf_filtered (stream, " size %s offset %s (bits)", | |
2612 | pulongest (ul), pulongest (offset)); | |
2613 | } | |
2614 | break; | |
8cf6f0b1 TT |
2615 | |
2616 | case DW_OP_GNU_implicit_pointer: | |
2617 | { | |
2618 | ul = extract_unsigned_integer (data, offset_size, | |
2619 | gdbarch_byte_order (arch)); | |
2620 | data += offset_size; | |
2621 | ||
2622 | data = read_sleb128 (data, end, &l); | |
2623 | ||
2624 | fprintf_filtered (stream, " DIE %s offset %s", | |
2625 | phex_nz (ul, offset_size), | |
2626 | plongest (l)); | |
2627 | } | |
2628 | break; | |
5e44ecb3 TT |
2629 | |
2630 | case DW_OP_GNU_deref_type: | |
2631 | { | |
2632 | int addr_size = *data++; | |
2633 | ULONGEST offset; | |
2634 | struct type *type; | |
2635 | ||
2636 | data = read_uleb128 (data, end, &offset); | |
2637 | type = dwarf2_get_die_type (offset, per_cu); | |
2638 | fprintf_filtered (stream, "<"); | |
2639 | type_print (type, "", stream, -1); | |
2640 | fprintf_filtered (stream, " [0x%s]> %d", phex_nz (offset, 0), | |
2641 | addr_size); | |
2642 | } | |
2643 | break; | |
2644 | ||
2645 | case DW_OP_GNU_const_type: | |
2646 | { | |
2647 | ULONGEST type_die; | |
2648 | struct type *type; | |
2649 | ||
2650 | data = read_uleb128 (data, end, &type_die); | |
2651 | type = dwarf2_get_die_type (type_die, per_cu); | |
2652 | fprintf_filtered (stream, "<"); | |
2653 | type_print (type, "", stream, -1); | |
2654 | fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die, 0)); | |
2655 | } | |
2656 | break; | |
2657 | ||
2658 | case DW_OP_GNU_regval_type: | |
2659 | { | |
2660 | ULONGEST type_die, reg; | |
2661 | struct type *type; | |
2662 | ||
2663 | data = read_uleb128 (data, end, ®); | |
2664 | data = read_uleb128 (data, end, &type_die); | |
2665 | ||
2666 | type = dwarf2_get_die_type (type_die, per_cu); | |
2667 | fprintf_filtered (stream, "<"); | |
2668 | type_print (type, "", stream, -1); | |
2669 | fprintf_filtered (stream, " [0x%s]> [$%s]", phex_nz (type_die, 0), | |
2670 | locexpr_regname (arch, reg)); | |
2671 | } | |
2672 | break; | |
2673 | ||
2674 | case DW_OP_GNU_convert: | |
2675 | case DW_OP_GNU_reinterpret: | |
2676 | { | |
2677 | ULONGEST type_die; | |
2678 | ||
2679 | data = read_uleb128 (data, end, &type_die); | |
2680 | ||
2681 | if (type_die == 0) | |
2682 | fprintf_filtered (stream, "<0>"); | |
2683 | else | |
2684 | { | |
2685 | struct type *type; | |
2686 | ||
2687 | type = dwarf2_get_die_type (type_die, per_cu); | |
2688 | fprintf_filtered (stream, "<"); | |
2689 | type_print (type, "", stream, -1); | |
2690 | fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die, 0)); | |
2691 | } | |
2692 | } | |
2693 | break; | |
9eae7c52 TT |
2694 | } |
2695 | ||
2696 | fprintf_filtered (stream, "\n"); | |
2697 | } | |
c3228f12 | 2698 | |
08922a10 | 2699 | return data; |
4c2df51b DJ |
2700 | } |
2701 | ||
08922a10 SS |
2702 | /* Describe a single location, which may in turn consist of multiple |
2703 | pieces. */ | |
a55cc764 | 2704 | |
08922a10 SS |
2705 | static void |
2706 | locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr, | |
0d45f56e TT |
2707 | struct ui_file *stream, |
2708 | const gdb_byte *data, int size, | |
9eae7c52 | 2709 | struct objfile *objfile, unsigned int addr_size, |
5e44ecb3 | 2710 | int offset_size, struct dwarf2_per_cu_data *per_cu) |
08922a10 | 2711 | { |
0d45f56e | 2712 | const gdb_byte *end = data + size; |
9eae7c52 | 2713 | int first_piece = 1, bad = 0; |
08922a10 | 2714 | |
08922a10 SS |
2715 | while (data < end) |
2716 | { | |
9eae7c52 TT |
2717 | const gdb_byte *here = data; |
2718 | int disassemble = 1; | |
2719 | ||
2720 | if (first_piece) | |
2721 | first_piece = 0; | |
2722 | else | |
2723 | fprintf_filtered (stream, _(", and ")); | |
08922a10 | 2724 | |
9eae7c52 TT |
2725 | if (!dwarf2_always_disassemble) |
2726 | { | |
3e43a32a MS |
2727 | data = locexpr_describe_location_piece (symbol, stream, |
2728 | addr, objfile, | |
9eae7c52 TT |
2729 | data, end, addr_size); |
2730 | /* If we printed anything, or if we have an empty piece, | |
2731 | then don't disassemble. */ | |
2732 | if (data != here | |
2733 | || data[0] == DW_OP_piece | |
2734 | || data[0] == DW_OP_bit_piece) | |
2735 | disassemble = 0; | |
08922a10 | 2736 | } |
9eae7c52 | 2737 | if (disassemble) |
3e43a32a MS |
2738 | data = disassemble_dwarf_expression (stream, |
2739 | get_objfile_arch (objfile), | |
9eae7c52 | 2740 | addr_size, offset_size, data, end, |
5e44ecb3 TT |
2741 | dwarf2_always_disassemble, |
2742 | per_cu); | |
9eae7c52 TT |
2743 | |
2744 | if (data < end) | |
08922a10 | 2745 | { |
9eae7c52 | 2746 | int empty = data == here; |
08922a10 | 2747 | |
9eae7c52 TT |
2748 | if (disassemble) |
2749 | fprintf_filtered (stream, " "); | |
2750 | if (data[0] == DW_OP_piece) | |
2751 | { | |
2752 | ULONGEST bytes; | |
08922a10 | 2753 | |
9eae7c52 | 2754 | data = read_uleb128 (data + 1, end, &bytes); |
08922a10 | 2755 | |
9eae7c52 TT |
2756 | if (empty) |
2757 | fprintf_filtered (stream, _("an empty %s-byte piece"), | |
2758 | pulongest (bytes)); | |
2759 | else | |
2760 | fprintf_filtered (stream, _(" [%s-byte piece]"), | |
2761 | pulongest (bytes)); | |
2762 | } | |
2763 | else if (data[0] == DW_OP_bit_piece) | |
2764 | { | |
2765 | ULONGEST bits, offset; | |
2766 | ||
2767 | data = read_uleb128 (data + 1, end, &bits); | |
2768 | data = read_uleb128 (data, end, &offset); | |
2769 | ||
2770 | if (empty) | |
2771 | fprintf_filtered (stream, | |
2772 | _("an empty %s-bit piece"), | |
2773 | pulongest (bits)); | |
2774 | else | |
2775 | fprintf_filtered (stream, | |
2776 | _(" [%s-bit piece, offset %s bits]"), | |
2777 | pulongest (bits), pulongest (offset)); | |
2778 | } | |
2779 | else | |
2780 | { | |
2781 | bad = 1; | |
2782 | break; | |
2783 | } | |
08922a10 SS |
2784 | } |
2785 | } | |
2786 | ||
2787 | if (bad || data > end) | |
2788 | error (_("Corrupted DWARF2 expression for \"%s\"."), | |
2789 | SYMBOL_PRINT_NAME (symbol)); | |
2790 | } | |
2791 | ||
2792 | /* Print a natural-language description of SYMBOL to STREAM. This | |
2793 | version is for a symbol with a single location. */ | |
a55cc764 | 2794 | |
08922a10 SS |
2795 | static void |
2796 | locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
2797 | struct ui_file *stream) | |
2798 | { | |
2799 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
2800 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); | |
2801 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 2802 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
08922a10 | 2803 | |
3e43a32a MS |
2804 | locexpr_describe_location_1 (symbol, addr, stream, |
2805 | dlbaton->data, dlbaton->size, | |
5e44ecb3 TT |
2806 | objfile, addr_size, offset_size, |
2807 | dlbaton->per_cu); | |
08922a10 SS |
2808 | } |
2809 | ||
2810 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
2811 | any necessary bytecode in AX. */ | |
a55cc764 | 2812 | |
0d53c4c4 | 2813 | static void |
505e835d UW |
2814 | locexpr_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch, |
2815 | struct agent_expr *ax, struct axs_value *value) | |
a55cc764 DJ |
2816 | { |
2817 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
3cf03773 | 2818 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
a55cc764 | 2819 | |
cabe9ab6 PA |
2820 | if (dlbaton->data == NULL || dlbaton->size == 0) |
2821 | value->optimized_out = 1; | |
2822 | else | |
9f6f94ff TT |
2823 | dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, |
2824 | dlbaton->data, dlbaton->data + dlbaton->size, | |
2825 | dlbaton->per_cu); | |
a55cc764 DJ |
2826 | } |
2827 | ||
4c2df51b DJ |
2828 | /* The set of location functions used with the DWARF-2 expression |
2829 | evaluator. */ | |
768a979c | 2830 | const struct symbol_computed_ops dwarf2_locexpr_funcs = { |
4c2df51b DJ |
2831 | locexpr_read_variable, |
2832 | locexpr_read_needs_frame, | |
2833 | locexpr_describe_location, | |
a55cc764 | 2834 | locexpr_tracepoint_var_ref |
4c2df51b | 2835 | }; |
0d53c4c4 DJ |
2836 | |
2837 | ||
2838 | /* Wrapper functions for location lists. These generally find | |
2839 | the appropriate location expression and call something above. */ | |
2840 | ||
2841 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
2842 | evaluator to calculate the location. */ | |
2843 | static struct value * | |
2844 | loclist_read_variable (struct symbol *symbol, struct frame_info *frame) | |
2845 | { | |
2846 | struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
2847 | struct value *val; | |
947bb88f | 2848 | const gdb_byte *data; |
b6b08ebf | 2849 | size_t size; |
8cf6f0b1 | 2850 | CORE_ADDR pc = frame ? get_frame_address_in_block (frame) : 0; |
0d53c4c4 | 2851 | |
8cf6f0b1 | 2852 | data = dwarf2_find_location_expression (dlbaton, &size, pc); |
0d53c4c4 | 2853 | if (data == NULL) |
a7035dbb | 2854 | val = allocate_optimized_out_value (SYMBOL_TYPE (symbol)); |
806048c6 | 2855 | else |
a2d33775 | 2856 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, data, size, |
ae0d2f24 | 2857 | dlbaton->per_cu); |
0d53c4c4 DJ |
2858 | |
2859 | return val; | |
2860 | } | |
2861 | ||
2862 | /* Return non-zero iff we need a frame to evaluate SYMBOL. */ | |
2863 | static int | |
2864 | loclist_read_needs_frame (struct symbol *symbol) | |
2865 | { | |
2866 | /* If there's a location list, then assume we need to have a frame | |
2867 | to choose the appropriate location expression. With tracking of | |
2868 | global variables this is not necessarily true, but such tracking | |
2869 | is disabled in GCC at the moment until we figure out how to | |
2870 | represent it. */ | |
2871 | ||
2872 | return 1; | |
2873 | } | |
2874 | ||
08922a10 SS |
2875 | /* Print a natural-language description of SYMBOL to STREAM. This |
2876 | version applies when there is a list of different locations, each | |
2877 | with a specified address range. */ | |
2878 | ||
2879 | static void | |
2880 | loclist_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
2881 | struct ui_file *stream) | |
0d53c4c4 | 2882 | { |
08922a10 SS |
2883 | struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); |
2884 | CORE_ADDR low, high; | |
947bb88f | 2885 | const gdb_byte *loc_ptr, *buf_end; |
08922a10 SS |
2886 | int length, first = 1; |
2887 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); | |
2888 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
2889 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
2890 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 2891 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
d4a087c7 | 2892 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
08922a10 SS |
2893 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); |
2894 | /* Adjust base_address for relocatable objects. */ | |
9aa1f1e3 | 2895 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); |
08922a10 SS |
2896 | CORE_ADDR base_address = dlbaton->base_address + base_offset; |
2897 | ||
2898 | loc_ptr = dlbaton->data; | |
2899 | buf_end = dlbaton->data + dlbaton->size; | |
2900 | ||
9eae7c52 | 2901 | fprintf_filtered (stream, _("multi-location:\n")); |
08922a10 SS |
2902 | |
2903 | /* Iterate through locations until we run out. */ | |
2904 | while (1) | |
2905 | { | |
2906 | if (buf_end - loc_ptr < 2 * addr_size) | |
2907 | error (_("Corrupted DWARF expression for symbol \"%s\"."), | |
2908 | SYMBOL_PRINT_NAME (symbol)); | |
2909 | ||
d4a087c7 UW |
2910 | if (signed_addr_p) |
2911 | low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
2912 | else | |
2913 | low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
2914 | loc_ptr += addr_size; | |
2915 | ||
2916 | if (signed_addr_p) | |
2917 | high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
2918 | else | |
2919 | high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
08922a10 SS |
2920 | loc_ptr += addr_size; |
2921 | ||
2922 | /* A base-address-selection entry. */ | |
d4a087c7 | 2923 | if ((low & base_mask) == base_mask) |
08922a10 | 2924 | { |
d4a087c7 | 2925 | base_address = high + base_offset; |
9eae7c52 | 2926 | fprintf_filtered (stream, _(" Base address %s"), |
08922a10 | 2927 | paddress (gdbarch, base_address)); |
08922a10 SS |
2928 | continue; |
2929 | } | |
2930 | ||
08922a10 SS |
2931 | /* An end-of-list entry. */ |
2932 | if (low == 0 && high == 0) | |
9eae7c52 | 2933 | break; |
08922a10 SS |
2934 | |
2935 | /* Otherwise, a location expression entry. */ | |
2936 | low += base_address; | |
2937 | high += base_address; | |
2938 | ||
2939 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); | |
2940 | loc_ptr += 2; | |
2941 | ||
08922a10 SS |
2942 | /* (It would improve readability to print only the minimum |
2943 | necessary digits of the second number of the range.) */ | |
9eae7c52 | 2944 | fprintf_filtered (stream, _(" Range %s-%s: "), |
08922a10 SS |
2945 | paddress (gdbarch, low), paddress (gdbarch, high)); |
2946 | ||
2947 | /* Now describe this particular location. */ | |
2948 | locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length, | |
5e44ecb3 TT |
2949 | objfile, addr_size, offset_size, |
2950 | dlbaton->per_cu); | |
9eae7c52 TT |
2951 | |
2952 | fprintf_filtered (stream, "\n"); | |
08922a10 SS |
2953 | |
2954 | loc_ptr += length; | |
2955 | } | |
0d53c4c4 DJ |
2956 | } |
2957 | ||
2958 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
2959 | any necessary bytecode in AX. */ | |
2960 | static void | |
505e835d UW |
2961 | loclist_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch, |
2962 | struct agent_expr *ax, struct axs_value *value) | |
0d53c4c4 DJ |
2963 | { |
2964 | struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 2965 | const gdb_byte *data; |
b6b08ebf | 2966 | size_t size; |
3cf03773 | 2967 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
0d53c4c4 | 2968 | |
8cf6f0b1 | 2969 | data = dwarf2_find_location_expression (dlbaton, &size, ax->scope); |
cabe9ab6 PA |
2970 | if (data == NULL || size == 0) |
2971 | value->optimized_out = 1; | |
2972 | else | |
9f6f94ff TT |
2973 | dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, data, data + size, |
2974 | dlbaton->per_cu); | |
0d53c4c4 DJ |
2975 | } |
2976 | ||
2977 | /* The set of location functions used with the DWARF-2 expression | |
2978 | evaluator and location lists. */ | |
768a979c | 2979 | const struct symbol_computed_ops dwarf2_loclist_funcs = { |
0d53c4c4 DJ |
2980 | loclist_read_variable, |
2981 | loclist_read_needs_frame, | |
2982 | loclist_describe_location, | |
2983 | loclist_tracepoint_var_ref | |
2984 | }; |