Commit | Line | Data |
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4c2df51b | 1 | /* DWARF 2 location expression support for GDB. |
feb13ab0 | 2 | |
28e7fd62 | 3 | Copyright (C) 2003-2013 Free Software Foundation, Inc. |
feb13ab0 | 4 | |
4c2df51b DJ |
5 | Contributed by Daniel Jacobowitz, MontaVista Software, Inc. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 JB |
11 | the Free Software Foundation; either version 3 of the License, or |
12 | (at your option) any later version. | |
4c2df51b | 13 | |
a9762ec7 JB |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
4c2df51b DJ |
18 | |
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
4c2df51b DJ |
21 | |
22 | #include "defs.h" | |
23 | #include "ui-out.h" | |
24 | #include "value.h" | |
25 | #include "frame.h" | |
26 | #include "gdbcore.h" | |
27 | #include "target.h" | |
28 | #include "inferior.h" | |
a55cc764 DJ |
29 | #include "ax.h" |
30 | #include "ax-gdb.h" | |
e4adbba9 | 31 | #include "regcache.h" |
c3228f12 | 32 | #include "objfiles.h" |
93ad78a7 | 33 | #include "exceptions.h" |
edb3359d | 34 | #include "block.h" |
8e3b41a9 | 35 | #include "gdbcmd.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 | |
fa3064dd YQ |
45 | DEF_VEC_I(int); |
46 | ||
9eae7c52 TT |
47 | extern int dwarf2_always_disassemble; |
48 | ||
1632a688 JK |
49 | static void dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc, |
50 | const gdb_byte **start, size_t *length); | |
0936ad1d | 51 | |
8e3b41a9 JK |
52 | static const struct dwarf_expr_context_funcs dwarf_expr_ctx_funcs; |
53 | ||
1632a688 JK |
54 | static struct value *dwarf2_evaluate_loc_desc_full (struct type *type, |
55 | struct frame_info *frame, | |
56 | const gdb_byte *data, | |
56eb65bd SP |
57 | size_t size, |
58 | struct dwarf2_per_cu_data *per_cu, | |
1632a688 | 59 | LONGEST byte_offset); |
8cf6f0b1 | 60 | |
f664829e DE |
61 | /* Until these have formal names, we define these here. |
62 | ref: http://gcc.gnu.org/wiki/DebugFission | |
63 | Each entry in .debug_loc.dwo begins with a byte that describes the entry, | |
64 | and is then followed by data specific to that entry. */ | |
65 | ||
66 | enum debug_loc_kind | |
67 | { | |
68 | /* Indicates the end of the list of entries. */ | |
69 | DEBUG_LOC_END_OF_LIST = 0, | |
70 | ||
71 | /* This is followed by an unsigned LEB128 number that is an index into | |
72 | .debug_addr and specifies the base address for all following entries. */ | |
73 | DEBUG_LOC_BASE_ADDRESS = 1, | |
74 | ||
75 | /* This is followed by two unsigned LEB128 numbers that are indices into | |
76 | .debug_addr and specify the beginning and ending addresses, and then | |
77 | a normal location expression as in .debug_loc. */ | |
3771a44c DE |
78 | DEBUG_LOC_START_END = 2, |
79 | ||
80 | /* This is followed by an unsigned LEB128 number that is an index into | |
81 | .debug_addr and specifies the beginning address, and a 4 byte unsigned | |
82 | number that specifies the length, and then a normal location expression | |
83 | as in .debug_loc. */ | |
84 | DEBUG_LOC_START_LENGTH = 3, | |
f664829e DE |
85 | |
86 | /* An internal value indicating there is insufficient data. */ | |
87 | DEBUG_LOC_BUFFER_OVERFLOW = -1, | |
88 | ||
89 | /* An internal value indicating an invalid kind of entry was found. */ | |
90 | DEBUG_LOC_INVALID_ENTRY = -2 | |
91 | }; | |
92 | ||
b6807d98 TT |
93 | /* Helper function which throws an error if a synthetic pointer is |
94 | invalid. */ | |
95 | ||
96 | static void | |
97 | invalid_synthetic_pointer (void) | |
98 | { | |
99 | error (_("access outside bounds of object " | |
100 | "referenced via synthetic pointer")); | |
101 | } | |
102 | ||
f664829e DE |
103 | /* Decode the addresses in a non-dwo .debug_loc entry. |
104 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
105 | The encoded low,high addresses are return in *LOW,*HIGH. | |
106 | The result indicates the kind of entry found. */ | |
107 | ||
108 | static enum debug_loc_kind | |
109 | decode_debug_loc_addresses (const gdb_byte *loc_ptr, const gdb_byte *buf_end, | |
110 | const gdb_byte **new_ptr, | |
111 | CORE_ADDR *low, CORE_ADDR *high, | |
112 | enum bfd_endian byte_order, | |
113 | unsigned int addr_size, | |
114 | int signed_addr_p) | |
115 | { | |
116 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); | |
117 | ||
118 | if (buf_end - loc_ptr < 2 * addr_size) | |
119 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
120 | ||
121 | if (signed_addr_p) | |
122 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
123 | else | |
124 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
125 | loc_ptr += addr_size; | |
126 | ||
127 | if (signed_addr_p) | |
128 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
129 | else | |
130 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
131 | loc_ptr += addr_size; | |
132 | ||
133 | *new_ptr = loc_ptr; | |
134 | ||
135 | /* A base-address-selection entry. */ | |
136 | if ((*low & base_mask) == base_mask) | |
137 | return DEBUG_LOC_BASE_ADDRESS; | |
138 | ||
139 | /* An end-of-list entry. */ | |
140 | if (*low == 0 && *high == 0) | |
141 | return DEBUG_LOC_END_OF_LIST; | |
142 | ||
3771a44c | 143 | return DEBUG_LOC_START_END; |
f664829e DE |
144 | } |
145 | ||
146 | /* Decode the addresses in .debug_loc.dwo entry. | |
147 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
148 | The encoded low,high addresses are return in *LOW,*HIGH. | |
149 | The result indicates the kind of entry found. */ | |
150 | ||
151 | static enum debug_loc_kind | |
152 | decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu, | |
153 | const gdb_byte *loc_ptr, | |
154 | const gdb_byte *buf_end, | |
155 | const gdb_byte **new_ptr, | |
3771a44c DE |
156 | CORE_ADDR *low, CORE_ADDR *high, |
157 | enum bfd_endian byte_order) | |
f664829e | 158 | { |
9fccedf7 | 159 | uint64_t low_index, high_index; |
f664829e DE |
160 | |
161 | if (loc_ptr == buf_end) | |
162 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
163 | ||
164 | switch (*loc_ptr++) | |
165 | { | |
166 | case DEBUG_LOC_END_OF_LIST: | |
167 | *new_ptr = loc_ptr; | |
168 | return DEBUG_LOC_END_OF_LIST; | |
169 | case DEBUG_LOC_BASE_ADDRESS: | |
170 | *low = 0; | |
171 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
172 | if (loc_ptr == NULL) | |
173 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
174 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
175 | *new_ptr = loc_ptr; | |
176 | return DEBUG_LOC_BASE_ADDRESS; | |
3771a44c | 177 | case DEBUG_LOC_START_END: |
f664829e DE |
178 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
179 | if (loc_ptr == NULL) | |
180 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
181 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
182 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
183 | if (loc_ptr == NULL) | |
184 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
185 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
186 | *new_ptr = loc_ptr; | |
3771a44c DE |
187 | return DEBUG_LOC_START_END; |
188 | case DEBUG_LOC_START_LENGTH: | |
189 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); | |
190 | if (loc_ptr == NULL) | |
191 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
192 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
193 | if (loc_ptr + 4 > buf_end) | |
194 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
195 | *high = *low; | |
196 | *high += extract_unsigned_integer (loc_ptr, 4, byte_order); | |
197 | *new_ptr = loc_ptr + 4; | |
198 | return DEBUG_LOC_START_LENGTH; | |
f664829e DE |
199 | default: |
200 | return DEBUG_LOC_INVALID_ENTRY; | |
201 | } | |
202 | } | |
203 | ||
8cf6f0b1 | 204 | /* A function for dealing with location lists. Given a |
0d53c4c4 DJ |
205 | symbol baton (BATON) and a pc value (PC), find the appropriate |
206 | location expression, set *LOCEXPR_LENGTH, and return a pointer | |
207 | to the beginning of the expression. Returns NULL on failure. | |
208 | ||
209 | For now, only return the first matching location expression; there | |
210 | can be more than one in the list. */ | |
211 | ||
8cf6f0b1 TT |
212 | const gdb_byte * |
213 | dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton, | |
214 | size_t *locexpr_length, CORE_ADDR pc) | |
0d53c4c4 | 215 | { |
ae0d2f24 | 216 | struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu); |
f7fd4728 | 217 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
e17a4113 | 218 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
ae0d2f24 | 219 | unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu); |
d4a087c7 | 220 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
8edfa926 | 221 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 222 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (baton->per_cu); |
8edfa926 | 223 | CORE_ADDR base_address = baton->base_address + base_offset; |
f664829e | 224 | const gdb_byte *loc_ptr, *buf_end; |
0d53c4c4 DJ |
225 | |
226 | loc_ptr = baton->data; | |
227 | buf_end = baton->data + baton->size; | |
228 | ||
229 | while (1) | |
230 | { | |
f664829e DE |
231 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
232 | int length; | |
233 | enum debug_loc_kind kind; | |
234 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
235 | ||
236 | if (baton->from_dwo) | |
237 | kind = decode_debug_loc_dwo_addresses (baton->per_cu, | |
238 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 239 | &low, &high, byte_order); |
d4a087c7 | 240 | else |
f664829e DE |
241 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
242 | &low, &high, | |
243 | byte_order, addr_size, | |
244 | signed_addr_p); | |
245 | loc_ptr = new_ptr; | |
246 | switch (kind) | |
1d6edc3c | 247 | { |
f664829e | 248 | case DEBUG_LOC_END_OF_LIST: |
1d6edc3c JK |
249 | *locexpr_length = 0; |
250 | return NULL; | |
f664829e DE |
251 | case DEBUG_LOC_BASE_ADDRESS: |
252 | base_address = high + base_offset; | |
253 | continue; | |
3771a44c DE |
254 | case DEBUG_LOC_START_END: |
255 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
256 | break; |
257 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
258 | case DEBUG_LOC_INVALID_ENTRY: | |
259 | error (_("dwarf2_find_location_expression: " | |
260 | "Corrupted DWARF expression.")); | |
261 | default: | |
262 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
1d6edc3c | 263 | } |
b5758fe4 | 264 | |
bed911e5 DE |
265 | /* Otherwise, a location expression entry. |
266 | If the entry is from a DWO, don't add base address: the entry is | |
267 | from .debug_addr which has absolute addresses. */ | |
268 | if (! baton->from_dwo) | |
269 | { | |
270 | low += base_address; | |
271 | high += base_address; | |
272 | } | |
0d53c4c4 | 273 | |
e17a4113 | 274 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); |
0d53c4c4 DJ |
275 | loc_ptr += 2; |
276 | ||
e18b2753 JK |
277 | if (low == high && pc == low) |
278 | { | |
279 | /* This is entry PC record present only at entry point | |
280 | of a function. Verify it is really the function entry point. */ | |
281 | ||
282 | struct block *pc_block = block_for_pc (pc); | |
283 | struct symbol *pc_func = NULL; | |
284 | ||
285 | if (pc_block) | |
286 | pc_func = block_linkage_function (pc_block); | |
287 | ||
288 | if (pc_func && pc == BLOCK_START (SYMBOL_BLOCK_VALUE (pc_func))) | |
289 | { | |
290 | *locexpr_length = length; | |
291 | return loc_ptr; | |
292 | } | |
293 | } | |
294 | ||
0d53c4c4 DJ |
295 | if (pc >= low && pc < high) |
296 | { | |
297 | *locexpr_length = length; | |
298 | return loc_ptr; | |
299 | } | |
300 | ||
301 | loc_ptr += length; | |
302 | } | |
303 | } | |
304 | ||
4c2df51b DJ |
305 | /* This is the baton used when performing dwarf2 expression |
306 | evaluation. */ | |
307 | struct dwarf_expr_baton | |
308 | { | |
309 | struct frame_info *frame; | |
17ea53c3 | 310 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b DJ |
311 | }; |
312 | ||
313 | /* Helper functions for dwarf2_evaluate_loc_desc. */ | |
314 | ||
4bc9efe1 | 315 | /* Using the frame specified in BATON, return the value of register |
0b2b0195 | 316 | REGNUM, treated as a pointer. */ |
4c2df51b | 317 | static CORE_ADDR |
61fbb938 | 318 | dwarf_expr_read_reg (void *baton, int dwarf_regnum) |
4c2df51b | 319 | { |
4c2df51b | 320 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; |
5e2b427d | 321 | struct gdbarch *gdbarch = get_frame_arch (debaton->frame); |
e5192dd8 | 322 | CORE_ADDR result; |
0b2b0195 | 323 | int regnum; |
e4adbba9 | 324 | |
5e2b427d UW |
325 | regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_regnum); |
326 | result = address_from_register (builtin_type (gdbarch)->builtin_data_ptr, | |
0b2b0195 | 327 | regnum, debaton->frame); |
4c2df51b DJ |
328 | return result; |
329 | } | |
330 | ||
331 | /* Read memory at ADDR (length LEN) into BUF. */ | |
332 | ||
333 | static void | |
852483bc | 334 | dwarf_expr_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
4c2df51b DJ |
335 | { |
336 | read_memory (addr, buf, len); | |
337 | } | |
338 | ||
339 | /* Using the frame specified in BATON, find the location expression | |
340 | describing the frame base. Return a pointer to it in START and | |
341 | its length in LENGTH. */ | |
342 | static void | |
0d45f56e | 343 | dwarf_expr_frame_base (void *baton, const gdb_byte **start, size_t * length) |
4c2df51b | 344 | { |
da62e633 AC |
345 | /* FIXME: cagney/2003-03-26: This code should be using |
346 | get_frame_base_address(), and then implement a dwarf2 specific | |
347 | this_base method. */ | |
4c2df51b | 348 | struct symbol *framefunc; |
4c2df51b | 349 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; |
c90a0773 HZ |
350 | struct block *bl = get_frame_block (debaton->frame, NULL); |
351 | ||
352 | if (bl == NULL) | |
353 | error (_("frame address is not available.")); | |
0d53c4c4 | 354 | |
edb3359d DJ |
355 | /* Use block_linkage_function, which returns a real (not inlined) |
356 | function, instead of get_frame_function, which may return an | |
357 | inlined function. */ | |
c90a0773 | 358 | framefunc = block_linkage_function (bl); |
0d53c4c4 | 359 | |
eff4f95e JG |
360 | /* If we found a frame-relative symbol then it was certainly within |
361 | some function associated with a frame. If we can't find the frame, | |
362 | something has gone wrong. */ | |
363 | gdb_assert (framefunc != NULL); | |
364 | ||
0936ad1d SS |
365 | dwarf_expr_frame_base_1 (framefunc, |
366 | get_frame_address_in_block (debaton->frame), | |
367 | start, length); | |
368 | } | |
369 | ||
f1e6e072 TT |
370 | /* Implement find_frame_base_location method for LOC_BLOCK functions using |
371 | DWARF expression for its DW_AT_frame_base. */ | |
372 | ||
373 | static void | |
374 | locexpr_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
375 | const gdb_byte **start, size_t *length) | |
376 | { | |
377 | struct dwarf2_locexpr_baton *symbaton = SYMBOL_LOCATION_BATON (framefunc); | |
378 | ||
379 | *length = symbaton->size; | |
380 | *start = symbaton->data; | |
381 | } | |
382 | ||
383 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior | |
384 | function uses DWARF expression for its DW_AT_frame_base. */ | |
385 | ||
386 | const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs = | |
387 | { | |
388 | locexpr_find_frame_base_location | |
389 | }; | |
390 | ||
391 | /* Implement find_frame_base_location method for LOC_BLOCK functions using | |
392 | DWARF location list for its DW_AT_frame_base. */ | |
393 | ||
394 | static void | |
395 | loclist_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
396 | const gdb_byte **start, size_t *length) | |
397 | { | |
398 | struct dwarf2_loclist_baton *symbaton = SYMBOL_LOCATION_BATON (framefunc); | |
399 | ||
400 | *start = dwarf2_find_location_expression (symbaton, length, pc); | |
401 | } | |
402 | ||
403 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior | |
404 | function uses DWARF location list for its DW_AT_frame_base. */ | |
405 | ||
406 | const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs = | |
407 | { | |
408 | loclist_find_frame_base_location | |
409 | }; | |
410 | ||
0936ad1d SS |
411 | static void |
412 | dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc, | |
0d45f56e | 413 | const gdb_byte **start, size_t *length) |
0936ad1d | 414 | { |
f1e6e072 | 415 | if (SYMBOL_BLOCK_OPS (framefunc) != NULL) |
0d53c4c4 | 416 | { |
f1e6e072 | 417 | const struct symbol_block_ops *ops_block = SYMBOL_BLOCK_OPS (framefunc); |
22c6caba | 418 | |
f1e6e072 | 419 | ops_block->find_frame_base_location (framefunc, pc, start, length); |
0d53c4c4 DJ |
420 | } |
421 | else | |
f1e6e072 | 422 | *length = 0; |
0d53c4c4 | 423 | |
1d6edc3c | 424 | if (*length == 0) |
8a3fe4f8 | 425 | error (_("Could not find the frame base for \"%s\"."), |
0d53c4c4 | 426 | SYMBOL_NATURAL_NAME (framefunc)); |
4c2df51b DJ |
427 | } |
428 | ||
e7802207 TT |
429 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for |
430 | the frame in BATON. */ | |
431 | ||
432 | static CORE_ADDR | |
433 | dwarf_expr_frame_cfa (void *baton) | |
434 | { | |
435 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
9a619af0 | 436 | |
e7802207 TT |
437 | return dwarf2_frame_cfa (debaton->frame); |
438 | } | |
439 | ||
8cf6f0b1 TT |
440 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for |
441 | the frame in BATON. */ | |
442 | ||
443 | static CORE_ADDR | |
444 | dwarf_expr_frame_pc (void *baton) | |
445 | { | |
446 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
447 | ||
448 | return get_frame_address_in_block (debaton->frame); | |
449 | } | |
450 | ||
4c2df51b DJ |
451 | /* Using the objfile specified in BATON, find the address for the |
452 | current thread's thread-local storage with offset OFFSET. */ | |
453 | static CORE_ADDR | |
454 | dwarf_expr_tls_address (void *baton, CORE_ADDR offset) | |
455 | { | |
456 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
17ea53c3 | 457 | struct objfile *objfile = dwarf2_per_cu_objfile (debaton->per_cu); |
4c2df51b | 458 | |
17ea53c3 | 459 | return target_translate_tls_address (objfile, offset); |
4c2df51b DJ |
460 | } |
461 | ||
3e43a32a MS |
462 | /* Call DWARF subroutine from DW_AT_location of DIE at DIE_OFFSET in |
463 | current CU (as is PER_CU). State of the CTX is not affected by the | |
464 | call and return. */ | |
5c631832 JK |
465 | |
466 | static void | |
b64f50a1 | 467 | per_cu_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset, |
8cf6f0b1 TT |
468 | struct dwarf2_per_cu_data *per_cu, |
469 | CORE_ADDR (*get_frame_pc) (void *baton), | |
470 | void *baton) | |
5c631832 JK |
471 | { |
472 | struct dwarf2_locexpr_baton block; | |
473 | ||
8b9737bf | 474 | block = dwarf2_fetch_die_loc_cu_off (die_offset, per_cu, get_frame_pc, baton); |
5c631832 JK |
475 | |
476 | /* DW_OP_call_ref is currently not supported. */ | |
477 | gdb_assert (block.per_cu == per_cu); | |
478 | ||
479 | dwarf_expr_eval (ctx, block.data, block.size); | |
480 | } | |
481 | ||
482 | /* Helper interface of per_cu_dwarf_call for dwarf2_evaluate_loc_desc. */ | |
483 | ||
484 | static void | |
b64f50a1 | 485 | dwarf_expr_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset) |
5c631832 JK |
486 | { |
487 | struct dwarf_expr_baton *debaton = ctx->baton; | |
488 | ||
37b50a69 | 489 | per_cu_dwarf_call (ctx, die_offset, debaton->per_cu, |
9e8b7a03 | 490 | ctx->funcs->get_frame_pc, ctx->baton); |
5c631832 JK |
491 | } |
492 | ||
8a9b8146 TT |
493 | /* Callback function for dwarf2_evaluate_loc_desc. */ |
494 | ||
495 | static struct type * | |
b64f50a1 JK |
496 | dwarf_expr_get_base_type (struct dwarf_expr_context *ctx, |
497 | cu_offset die_offset) | |
8a9b8146 TT |
498 | { |
499 | struct dwarf_expr_baton *debaton = ctx->baton; | |
500 | ||
501 | return dwarf2_get_die_type (die_offset, debaton->per_cu); | |
502 | } | |
503 | ||
8e3b41a9 JK |
504 | /* See dwarf2loc.h. */ |
505 | ||
ccce17b0 | 506 | unsigned int entry_values_debug = 0; |
8e3b41a9 JK |
507 | |
508 | /* Helper to set entry_values_debug. */ | |
509 | ||
510 | static void | |
511 | show_entry_values_debug (struct ui_file *file, int from_tty, | |
512 | struct cmd_list_element *c, const char *value) | |
513 | { | |
514 | fprintf_filtered (file, | |
515 | _("Entry values and tail call frames debugging is %s.\n"), | |
516 | value); | |
517 | } | |
518 | ||
519 | /* Find DW_TAG_GNU_call_site's DW_AT_GNU_call_site_target address. | |
520 | CALLER_FRAME (for registers) can be NULL if it is not known. This function | |
521 | always returns valid address or it throws NO_ENTRY_VALUE_ERROR. */ | |
522 | ||
523 | static CORE_ADDR | |
524 | call_site_to_target_addr (struct gdbarch *call_site_gdbarch, | |
525 | struct call_site *call_site, | |
526 | struct frame_info *caller_frame) | |
527 | { | |
528 | switch (FIELD_LOC_KIND (call_site->target)) | |
529 | { | |
530 | case FIELD_LOC_KIND_DWARF_BLOCK: | |
531 | { | |
532 | struct dwarf2_locexpr_baton *dwarf_block; | |
533 | struct value *val; | |
534 | struct type *caller_core_addr_type; | |
535 | struct gdbarch *caller_arch; | |
536 | ||
537 | dwarf_block = FIELD_DWARF_BLOCK (call_site->target); | |
538 | if (dwarf_block == NULL) | |
539 | { | |
7cbd4a93 | 540 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
541 | |
542 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
543 | throw_error (NO_ENTRY_VALUE_ERROR, | |
544 | _("DW_AT_GNU_call_site_target is not specified " | |
545 | "at %s in %s"), | |
546 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 TT |
547 | (msym.minsym == NULL ? "???" |
548 | : SYMBOL_PRINT_NAME (msym.minsym))); | |
8e3b41a9 JK |
549 | |
550 | } | |
551 | if (caller_frame == NULL) | |
552 | { | |
7cbd4a93 | 553 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
554 | |
555 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
556 | throw_error (NO_ENTRY_VALUE_ERROR, | |
557 | _("DW_AT_GNU_call_site_target DWARF block resolving " | |
558 | "requires known frame which is currently not " | |
559 | "available at %s in %s"), | |
560 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 TT |
561 | (msym.minsym == NULL ? "???" |
562 | : SYMBOL_PRINT_NAME (msym.minsym))); | |
8e3b41a9 JK |
563 | |
564 | } | |
565 | caller_arch = get_frame_arch (caller_frame); | |
566 | caller_core_addr_type = builtin_type (caller_arch)->builtin_func_ptr; | |
567 | val = dwarf2_evaluate_loc_desc (caller_core_addr_type, caller_frame, | |
568 | dwarf_block->data, dwarf_block->size, | |
569 | dwarf_block->per_cu); | |
570 | /* DW_AT_GNU_call_site_target is a DWARF expression, not a DWARF | |
571 | location. */ | |
572 | if (VALUE_LVAL (val) == lval_memory) | |
573 | return value_address (val); | |
574 | else | |
575 | return value_as_address (val); | |
576 | } | |
577 | ||
578 | case FIELD_LOC_KIND_PHYSNAME: | |
579 | { | |
580 | const char *physname; | |
581 | struct minimal_symbol *msym; | |
582 | ||
583 | physname = FIELD_STATIC_PHYSNAME (call_site->target); | |
9112db09 JK |
584 | |
585 | /* Handle both the mangled and demangled PHYSNAME. */ | |
586 | msym = lookup_minimal_symbol (physname, NULL, NULL); | |
8e3b41a9 JK |
587 | if (msym == NULL) |
588 | { | |
7cbd4a93 | 589 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1).minsym; |
8e3b41a9 JK |
590 | throw_error (NO_ENTRY_VALUE_ERROR, |
591 | _("Cannot find function \"%s\" for a call site target " | |
592 | "at %s in %s"), | |
593 | physname, paddress (call_site_gdbarch, call_site->pc), | |
594 | msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym)); | |
595 | ||
596 | } | |
597 | return SYMBOL_VALUE_ADDRESS (msym); | |
598 | } | |
599 | ||
600 | case FIELD_LOC_KIND_PHYSADDR: | |
601 | return FIELD_STATIC_PHYSADDR (call_site->target); | |
602 | ||
603 | default: | |
604 | internal_error (__FILE__, __LINE__, _("invalid call site target kind")); | |
605 | } | |
606 | } | |
607 | ||
111c6489 JK |
608 | /* Convert function entry point exact address ADDR to the function which is |
609 | compliant with TAIL_CALL_LIST_COMPLETE condition. Throw | |
610 | NO_ENTRY_VALUE_ERROR otherwise. */ | |
611 | ||
612 | static struct symbol * | |
613 | func_addr_to_tail_call_list (struct gdbarch *gdbarch, CORE_ADDR addr) | |
614 | { | |
615 | struct symbol *sym = find_pc_function (addr); | |
616 | struct type *type; | |
617 | ||
618 | if (sym == NULL || BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) != addr) | |
619 | throw_error (NO_ENTRY_VALUE_ERROR, | |
620 | _("DW_TAG_GNU_call_site resolving failed to find function " | |
621 | "name for address %s"), | |
622 | paddress (gdbarch, addr)); | |
623 | ||
624 | type = SYMBOL_TYPE (sym); | |
625 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FUNC); | |
626 | gdb_assert (TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_FUNC); | |
627 | ||
628 | return sym; | |
629 | } | |
630 | ||
2d6c5dc2 JK |
631 | /* Verify function with entry point exact address ADDR can never call itself |
632 | via its tail calls (incl. transitively). Throw NO_ENTRY_VALUE_ERROR if it | |
633 | can call itself via tail calls. | |
634 | ||
635 | If a funtion can tail call itself its entry value based parameters are | |
636 | unreliable. There is no verification whether the value of some/all | |
637 | parameters is unchanged through the self tail call, we expect if there is | |
638 | a self tail call all the parameters can be modified. */ | |
639 | ||
640 | static void | |
641 | func_verify_no_selftailcall (struct gdbarch *gdbarch, CORE_ADDR verify_addr) | |
642 | { | |
643 | struct obstack addr_obstack; | |
644 | struct cleanup *old_chain; | |
645 | CORE_ADDR addr; | |
646 | ||
647 | /* Track here CORE_ADDRs which were already visited. */ | |
648 | htab_t addr_hash; | |
649 | ||
650 | /* The verification is completely unordered. Track here function addresses | |
651 | which still need to be iterated. */ | |
652 | VEC (CORE_ADDR) *todo = NULL; | |
653 | ||
654 | obstack_init (&addr_obstack); | |
655 | old_chain = make_cleanup_obstack_free (&addr_obstack); | |
656 | addr_hash = htab_create_alloc_ex (64, core_addr_hash, core_addr_eq, NULL, | |
657 | &addr_obstack, hashtab_obstack_allocate, | |
658 | NULL); | |
659 | make_cleanup_htab_delete (addr_hash); | |
660 | ||
661 | make_cleanup (VEC_cleanup (CORE_ADDR), &todo); | |
662 | ||
663 | VEC_safe_push (CORE_ADDR, todo, verify_addr); | |
664 | while (!VEC_empty (CORE_ADDR, todo)) | |
665 | { | |
666 | struct symbol *func_sym; | |
667 | struct call_site *call_site; | |
668 | ||
669 | addr = VEC_pop (CORE_ADDR, todo); | |
670 | ||
671 | func_sym = func_addr_to_tail_call_list (gdbarch, addr); | |
672 | ||
673 | for (call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (func_sym)); | |
674 | call_site; call_site = call_site->tail_call_next) | |
675 | { | |
676 | CORE_ADDR target_addr; | |
677 | void **slot; | |
678 | ||
679 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
680 | frames. */ | |
681 | target_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
682 | ||
683 | if (target_addr == verify_addr) | |
684 | { | |
7cbd4a93 | 685 | struct bound_minimal_symbol msym; |
2d6c5dc2 JK |
686 | |
687 | msym = lookup_minimal_symbol_by_pc (verify_addr); | |
688 | throw_error (NO_ENTRY_VALUE_ERROR, | |
689 | _("DW_OP_GNU_entry_value resolving has found " | |
690 | "function \"%s\" at %s can call itself via tail " | |
691 | "calls"), | |
7cbd4a93 TT |
692 | (msym.minsym == NULL ? "???" |
693 | : SYMBOL_PRINT_NAME (msym.minsym)), | |
2d6c5dc2 JK |
694 | paddress (gdbarch, verify_addr)); |
695 | } | |
696 | ||
697 | slot = htab_find_slot (addr_hash, &target_addr, INSERT); | |
698 | if (*slot == NULL) | |
699 | { | |
700 | *slot = obstack_copy (&addr_obstack, &target_addr, | |
701 | sizeof (target_addr)); | |
702 | VEC_safe_push (CORE_ADDR, todo, target_addr); | |
703 | } | |
704 | } | |
705 | } | |
706 | ||
707 | do_cleanups (old_chain); | |
708 | } | |
709 | ||
111c6489 JK |
710 | /* Print user readable form of CALL_SITE->PC to gdb_stdlog. Used only for |
711 | ENTRY_VALUES_DEBUG. */ | |
712 | ||
713 | static void | |
714 | tailcall_dump (struct gdbarch *gdbarch, const struct call_site *call_site) | |
715 | { | |
716 | CORE_ADDR addr = call_site->pc; | |
7cbd4a93 | 717 | struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (addr - 1); |
111c6489 JK |
718 | |
719 | fprintf_unfiltered (gdb_stdlog, " %s(%s)", paddress (gdbarch, addr), | |
7cbd4a93 TT |
720 | (msym.minsym == NULL ? "???" |
721 | : SYMBOL_PRINT_NAME (msym.minsym))); | |
111c6489 JK |
722 | |
723 | } | |
724 | ||
725 | /* vec.h needs single word type name, typedef it. */ | |
726 | typedef struct call_site *call_sitep; | |
727 | ||
728 | /* Define VEC (call_sitep) functions. */ | |
729 | DEF_VEC_P (call_sitep); | |
730 | ||
731 | /* Intersect RESULTP with CHAIN to keep RESULTP unambiguous, keep in RESULTP | |
732 | only top callers and bottom callees which are present in both. GDBARCH is | |
733 | used only for ENTRY_VALUES_DEBUG. RESULTP is NULL after return if there are | |
734 | no remaining possibilities to provide unambiguous non-trivial result. | |
735 | RESULTP should point to NULL on the first (initialization) call. Caller is | |
736 | responsible for xfree of any RESULTP data. */ | |
737 | ||
738 | static void | |
739 | chain_candidate (struct gdbarch *gdbarch, struct call_site_chain **resultp, | |
740 | VEC (call_sitep) *chain) | |
741 | { | |
742 | struct call_site_chain *result = *resultp; | |
743 | long length = VEC_length (call_sitep, chain); | |
744 | int callers, callees, idx; | |
745 | ||
746 | if (result == NULL) | |
747 | { | |
748 | /* Create the initial chain containing all the passed PCs. */ | |
749 | ||
750 | result = xmalloc (sizeof (*result) + sizeof (*result->call_site) | |
751 | * (length - 1)); | |
752 | result->length = length; | |
753 | result->callers = result->callees = length; | |
754 | memcpy (result->call_site, VEC_address (call_sitep, chain), | |
755 | sizeof (*result->call_site) * length); | |
756 | *resultp = result; | |
757 | ||
758 | if (entry_values_debug) | |
759 | { | |
760 | fprintf_unfiltered (gdb_stdlog, "tailcall: initial:"); | |
761 | for (idx = 0; idx < length; idx++) | |
762 | tailcall_dump (gdbarch, result->call_site[idx]); | |
763 | fputc_unfiltered ('\n', gdb_stdlog); | |
764 | } | |
765 | ||
766 | return; | |
767 | } | |
768 | ||
769 | if (entry_values_debug) | |
770 | { | |
771 | fprintf_unfiltered (gdb_stdlog, "tailcall: compare:"); | |
772 | for (idx = 0; idx < length; idx++) | |
773 | tailcall_dump (gdbarch, VEC_index (call_sitep, chain, idx)); | |
774 | fputc_unfiltered ('\n', gdb_stdlog); | |
775 | } | |
776 | ||
777 | /* Intersect callers. */ | |
778 | ||
779 | callers = min (result->callers, length); | |
780 | for (idx = 0; idx < callers; idx++) | |
781 | if (result->call_site[idx] != VEC_index (call_sitep, chain, idx)) | |
782 | { | |
783 | result->callers = idx; | |
784 | break; | |
785 | } | |
786 | ||
787 | /* Intersect callees. */ | |
788 | ||
789 | callees = min (result->callees, length); | |
790 | for (idx = 0; idx < callees; idx++) | |
791 | if (result->call_site[result->length - 1 - idx] | |
792 | != VEC_index (call_sitep, chain, length - 1 - idx)) | |
793 | { | |
794 | result->callees = idx; | |
795 | break; | |
796 | } | |
797 | ||
798 | if (entry_values_debug) | |
799 | { | |
800 | fprintf_unfiltered (gdb_stdlog, "tailcall: reduced:"); | |
801 | for (idx = 0; idx < result->callers; idx++) | |
802 | tailcall_dump (gdbarch, result->call_site[idx]); | |
803 | fputs_unfiltered (" |", gdb_stdlog); | |
804 | for (idx = 0; idx < result->callees; idx++) | |
805 | tailcall_dump (gdbarch, result->call_site[result->length | |
806 | - result->callees + idx]); | |
807 | fputc_unfiltered ('\n', gdb_stdlog); | |
808 | } | |
809 | ||
810 | if (result->callers == 0 && result->callees == 0) | |
811 | { | |
812 | /* There are no common callers or callees. It could be also a direct | |
813 | call (which has length 0) with ambiguous possibility of an indirect | |
814 | call - CALLERS == CALLEES == 0 is valid during the first allocation | |
815 | but any subsequence processing of such entry means ambiguity. */ | |
816 | xfree (result); | |
817 | *resultp = NULL; | |
818 | return; | |
819 | } | |
820 | ||
821 | /* See call_site_find_chain_1 why there is no way to reach the bottom callee | |
822 | PC again. In such case there must be two different code paths to reach | |
823 | it, therefore some of the former determined intermediate PCs must differ | |
824 | and the unambiguous chain gets shortened. */ | |
825 | gdb_assert (result->callers + result->callees < result->length); | |
826 | } | |
827 | ||
828 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
829 | assumed frames between them use GDBARCH. Use depth first search so we can | |
830 | keep single CHAIN of call_site's back to CALLER_PC. Function recursion | |
831 | would have needless GDB stack overhead. Caller is responsible for xfree of | |
832 | the returned result. Any unreliability results in thrown | |
833 | NO_ENTRY_VALUE_ERROR. */ | |
834 | ||
835 | static struct call_site_chain * | |
836 | call_site_find_chain_1 (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
837 | CORE_ADDR callee_pc) | |
838 | { | |
c4be5165 | 839 | CORE_ADDR save_callee_pc = callee_pc; |
111c6489 JK |
840 | struct obstack addr_obstack; |
841 | struct cleanup *back_to_retval, *back_to_workdata; | |
842 | struct call_site_chain *retval = NULL; | |
843 | struct call_site *call_site; | |
844 | ||
845 | /* Mark CALL_SITEs so we do not visit the same ones twice. */ | |
846 | htab_t addr_hash; | |
847 | ||
848 | /* CHAIN contains only the intermediate CALL_SITEs. Neither CALLER_PC's | |
849 | call_site nor any possible call_site at CALLEE_PC's function is there. | |
850 | Any CALL_SITE in CHAIN will be iterated to its siblings - via | |
851 | TAIL_CALL_NEXT. This is inappropriate for CALLER_PC's call_site. */ | |
852 | VEC (call_sitep) *chain = NULL; | |
853 | ||
854 | /* We are not interested in the specific PC inside the callee function. */ | |
855 | callee_pc = get_pc_function_start (callee_pc); | |
856 | if (callee_pc == 0) | |
857 | throw_error (NO_ENTRY_VALUE_ERROR, _("Unable to find function for PC %s"), | |
c4be5165 | 858 | paddress (gdbarch, save_callee_pc)); |
111c6489 JK |
859 | |
860 | back_to_retval = make_cleanup (free_current_contents, &retval); | |
861 | ||
862 | obstack_init (&addr_obstack); | |
863 | back_to_workdata = make_cleanup_obstack_free (&addr_obstack); | |
864 | addr_hash = htab_create_alloc_ex (64, core_addr_hash, core_addr_eq, NULL, | |
865 | &addr_obstack, hashtab_obstack_allocate, | |
866 | NULL); | |
867 | make_cleanup_htab_delete (addr_hash); | |
868 | ||
869 | make_cleanup (VEC_cleanup (call_sitep), &chain); | |
870 | ||
871 | /* Do not push CALL_SITE to CHAIN. Push there only the first tail call site | |
872 | at the target's function. All the possible tail call sites in the | |
873 | target's function will get iterated as already pushed into CHAIN via their | |
874 | TAIL_CALL_NEXT. */ | |
875 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
876 | ||
877 | while (call_site) | |
878 | { | |
879 | CORE_ADDR target_func_addr; | |
880 | struct call_site *target_call_site; | |
881 | ||
882 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
883 | frames. */ | |
884 | target_func_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
885 | ||
886 | if (target_func_addr == callee_pc) | |
887 | { | |
888 | chain_candidate (gdbarch, &retval, chain); | |
889 | if (retval == NULL) | |
890 | break; | |
891 | ||
892 | /* There is no way to reach CALLEE_PC again as we would prevent | |
893 | entering it twice as being already marked in ADDR_HASH. */ | |
894 | target_call_site = NULL; | |
895 | } | |
896 | else | |
897 | { | |
898 | struct symbol *target_func; | |
899 | ||
900 | target_func = func_addr_to_tail_call_list (gdbarch, target_func_addr); | |
901 | target_call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (target_func)); | |
902 | } | |
903 | ||
904 | do | |
905 | { | |
906 | /* Attempt to visit TARGET_CALL_SITE. */ | |
907 | ||
908 | if (target_call_site) | |
909 | { | |
910 | void **slot; | |
911 | ||
912 | slot = htab_find_slot (addr_hash, &target_call_site->pc, INSERT); | |
913 | if (*slot == NULL) | |
914 | { | |
915 | /* Successfully entered TARGET_CALL_SITE. */ | |
916 | ||
917 | *slot = &target_call_site->pc; | |
918 | VEC_safe_push (call_sitep, chain, target_call_site); | |
919 | break; | |
920 | } | |
921 | } | |
922 | ||
923 | /* Backtrack (without revisiting the originating call_site). Try the | |
924 | callers's sibling; if there isn't any try the callers's callers's | |
925 | sibling etc. */ | |
926 | ||
927 | target_call_site = NULL; | |
928 | while (!VEC_empty (call_sitep, chain)) | |
929 | { | |
930 | call_site = VEC_pop (call_sitep, chain); | |
931 | ||
932 | gdb_assert (htab_find_slot (addr_hash, &call_site->pc, | |
933 | NO_INSERT) != NULL); | |
934 | htab_remove_elt (addr_hash, &call_site->pc); | |
935 | ||
936 | target_call_site = call_site->tail_call_next; | |
937 | if (target_call_site) | |
938 | break; | |
939 | } | |
940 | } | |
941 | while (target_call_site); | |
942 | ||
943 | if (VEC_empty (call_sitep, chain)) | |
944 | call_site = NULL; | |
945 | else | |
946 | call_site = VEC_last (call_sitep, chain); | |
947 | } | |
948 | ||
949 | if (retval == NULL) | |
950 | { | |
7cbd4a93 | 951 | struct bound_minimal_symbol msym_caller, msym_callee; |
111c6489 JK |
952 | |
953 | msym_caller = lookup_minimal_symbol_by_pc (caller_pc); | |
954 | msym_callee = lookup_minimal_symbol_by_pc (callee_pc); | |
955 | throw_error (NO_ENTRY_VALUE_ERROR, | |
956 | _("There are no unambiguously determinable intermediate " | |
957 | "callers or callees between caller function \"%s\" at %s " | |
958 | "and callee function \"%s\" at %s"), | |
7cbd4a93 TT |
959 | (msym_caller.minsym == NULL |
960 | ? "???" : SYMBOL_PRINT_NAME (msym_caller.minsym)), | |
111c6489 | 961 | paddress (gdbarch, caller_pc), |
7cbd4a93 TT |
962 | (msym_callee.minsym == NULL |
963 | ? "???" : SYMBOL_PRINT_NAME (msym_callee.minsym)), | |
111c6489 JK |
964 | paddress (gdbarch, callee_pc)); |
965 | } | |
966 | ||
967 | do_cleanups (back_to_workdata); | |
968 | discard_cleanups (back_to_retval); | |
969 | return retval; | |
970 | } | |
971 | ||
972 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
973 | assumed frames between them use GDBARCH. If valid call_site_chain cannot be | |
974 | constructed return NULL. Caller is responsible for xfree of the returned | |
975 | result. */ | |
976 | ||
977 | struct call_site_chain * | |
978 | call_site_find_chain (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
979 | CORE_ADDR callee_pc) | |
980 | { | |
981 | volatile struct gdb_exception e; | |
982 | struct call_site_chain *retval = NULL; | |
983 | ||
984 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
985 | { | |
986 | retval = call_site_find_chain_1 (gdbarch, caller_pc, callee_pc); | |
987 | } | |
988 | if (e.reason < 0) | |
989 | { | |
990 | if (e.error == NO_ENTRY_VALUE_ERROR) | |
991 | { | |
992 | if (entry_values_debug) | |
993 | exception_print (gdb_stdout, e); | |
994 | ||
995 | return NULL; | |
996 | } | |
997 | else | |
998 | throw_exception (e); | |
999 | } | |
1000 | return retval; | |
1001 | } | |
1002 | ||
24c5c679 JK |
1003 | /* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */ |
1004 | ||
1005 | static int | |
1006 | call_site_parameter_matches (struct call_site_parameter *parameter, | |
1007 | enum call_site_parameter_kind kind, | |
1008 | union call_site_parameter_u kind_u) | |
1009 | { | |
1010 | if (kind == parameter->kind) | |
1011 | switch (kind) | |
1012 | { | |
1013 | case CALL_SITE_PARAMETER_DWARF_REG: | |
1014 | return kind_u.dwarf_reg == parameter->u.dwarf_reg; | |
1015 | case CALL_SITE_PARAMETER_FB_OFFSET: | |
1016 | return kind_u.fb_offset == parameter->u.fb_offset; | |
1788b2d3 JK |
1017 | case CALL_SITE_PARAMETER_PARAM_OFFSET: |
1018 | return kind_u.param_offset.cu_off == parameter->u.param_offset.cu_off; | |
24c5c679 JK |
1019 | } |
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | /* Fetch call_site_parameter from caller matching KIND and KIND_U. | |
1024 | FRAME is for callee. | |
8e3b41a9 JK |
1025 | |
1026 | Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR | |
1027 | otherwise. */ | |
1028 | ||
1029 | static struct call_site_parameter * | |
24c5c679 JK |
1030 | dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, |
1031 | enum call_site_parameter_kind kind, | |
1032 | union call_site_parameter_u kind_u, | |
8e3b41a9 JK |
1033 | struct dwarf2_per_cu_data **per_cu_return) |
1034 | { | |
9e3a7d65 JK |
1035 | CORE_ADDR func_addr, caller_pc; |
1036 | struct gdbarch *gdbarch; | |
1037 | struct frame_info *caller_frame; | |
8e3b41a9 JK |
1038 | struct call_site *call_site; |
1039 | int iparams; | |
509f0fd9 JK |
1040 | /* Initialize it just to avoid a GCC false warning. */ |
1041 | struct call_site_parameter *parameter = NULL; | |
8e3b41a9 JK |
1042 | CORE_ADDR target_addr; |
1043 | ||
9e3a7d65 JK |
1044 | while (get_frame_type (frame) == INLINE_FRAME) |
1045 | { | |
1046 | frame = get_prev_frame (frame); | |
1047 | gdb_assert (frame != NULL); | |
1048 | } | |
1049 | ||
1050 | func_addr = get_frame_func (frame); | |
1051 | gdbarch = get_frame_arch (frame); | |
1052 | caller_frame = get_prev_frame (frame); | |
8e3b41a9 JK |
1053 | if (gdbarch != frame_unwind_arch (frame)) |
1054 | { | |
7cbd4a93 TT |
1055 | struct bound_minimal_symbol msym |
1056 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1057 | struct gdbarch *caller_gdbarch = frame_unwind_arch (frame); |
1058 | ||
1059 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1060 | _("DW_OP_GNU_entry_value resolving callee gdbarch %s " | |
1061 | "(of %s (%s)) does not match caller gdbarch %s"), | |
1062 | gdbarch_bfd_arch_info (gdbarch)->printable_name, | |
1063 | paddress (gdbarch, func_addr), | |
7cbd4a93 TT |
1064 | (msym.minsym == NULL ? "???" |
1065 | : SYMBOL_PRINT_NAME (msym.minsym)), | |
8e3b41a9 JK |
1066 | gdbarch_bfd_arch_info (caller_gdbarch)->printable_name); |
1067 | } | |
1068 | ||
1069 | if (caller_frame == NULL) | |
1070 | { | |
7cbd4a93 TT |
1071 | struct bound_minimal_symbol msym |
1072 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1073 | |
1074 | throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_GNU_entry_value resolving " | |
1075 | "requires caller of %s (%s)"), | |
1076 | paddress (gdbarch, func_addr), | |
7cbd4a93 TT |
1077 | (msym.minsym == NULL ? "???" |
1078 | : SYMBOL_PRINT_NAME (msym.minsym))); | |
8e3b41a9 JK |
1079 | } |
1080 | caller_pc = get_frame_pc (caller_frame); | |
1081 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1082 | ||
1083 | target_addr = call_site_to_target_addr (gdbarch, call_site, caller_frame); | |
1084 | if (target_addr != func_addr) | |
1085 | { | |
1086 | struct minimal_symbol *target_msym, *func_msym; | |
1087 | ||
7cbd4a93 TT |
1088 | target_msym = lookup_minimal_symbol_by_pc (target_addr).minsym; |
1089 | func_msym = lookup_minimal_symbol_by_pc (func_addr).minsym; | |
8e3b41a9 JK |
1090 | throw_error (NO_ENTRY_VALUE_ERROR, |
1091 | _("DW_OP_GNU_entry_value resolving expects callee %s at %s " | |
1092 | "but the called frame is for %s at %s"), | |
1093 | (target_msym == NULL ? "???" | |
1094 | : SYMBOL_PRINT_NAME (target_msym)), | |
1095 | paddress (gdbarch, target_addr), | |
1096 | func_msym == NULL ? "???" : SYMBOL_PRINT_NAME (func_msym), | |
1097 | paddress (gdbarch, func_addr)); | |
1098 | } | |
1099 | ||
2d6c5dc2 JK |
1100 | /* No entry value based parameters would be reliable if this function can |
1101 | call itself via tail calls. */ | |
1102 | func_verify_no_selftailcall (gdbarch, func_addr); | |
1103 | ||
8e3b41a9 JK |
1104 | for (iparams = 0; iparams < call_site->parameter_count; iparams++) |
1105 | { | |
1106 | parameter = &call_site->parameter[iparams]; | |
24c5c679 | 1107 | if (call_site_parameter_matches (parameter, kind, kind_u)) |
8e3b41a9 JK |
1108 | break; |
1109 | } | |
1110 | if (iparams == call_site->parameter_count) | |
1111 | { | |
7cbd4a93 TT |
1112 | struct minimal_symbol *msym |
1113 | = lookup_minimal_symbol_by_pc (caller_pc).minsym; | |
8e3b41a9 JK |
1114 | |
1115 | /* DW_TAG_GNU_call_site_parameter will be missing just if GCC could not | |
1116 | determine its value. */ | |
1117 | throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot find matching parameter " | |
1118 | "at DW_TAG_GNU_call_site %s at %s"), | |
1119 | paddress (gdbarch, caller_pc), | |
1120 | msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym)); | |
1121 | } | |
1122 | ||
1123 | *per_cu_return = call_site->per_cu; | |
1124 | return parameter; | |
1125 | } | |
1126 | ||
a471c594 JK |
1127 | /* Return value for PARAMETER matching DEREF_SIZE. If DEREF_SIZE is -1, return |
1128 | the normal DW_AT_GNU_call_site_value block. Otherwise return the | |
1129 | DW_AT_GNU_call_site_data_value (dereferenced) block. | |
e18b2753 JK |
1130 | |
1131 | TYPE and CALLER_FRAME specify how to evaluate the DWARF block into returned | |
1132 | struct value. | |
1133 | ||
1134 | Function always returns non-NULL, non-optimized out value. It throws | |
1135 | NO_ENTRY_VALUE_ERROR if it cannot resolve the value for any reason. */ | |
1136 | ||
1137 | static struct value * | |
1138 | dwarf_entry_parameter_to_value (struct call_site_parameter *parameter, | |
a471c594 | 1139 | CORE_ADDR deref_size, struct type *type, |
e18b2753 JK |
1140 | struct frame_info *caller_frame, |
1141 | struct dwarf2_per_cu_data *per_cu) | |
1142 | { | |
a471c594 | 1143 | const gdb_byte *data_src; |
e18b2753 | 1144 | gdb_byte *data; |
a471c594 JK |
1145 | size_t size; |
1146 | ||
1147 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
1148 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1149 | ||
1150 | /* DEREF_SIZE size is not verified here. */ | |
1151 | if (data_src == NULL) | |
1152 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1153 | _("Cannot resolve DW_AT_GNU_call_site_data_value")); | |
e18b2753 JK |
1154 | |
1155 | /* DW_AT_GNU_call_site_value is a DWARF expression, not a DWARF | |
1156 | location. Postprocessing of DWARF_VALUE_MEMORY would lose the type from | |
1157 | DWARF block. */ | |
a471c594 JK |
1158 | data = alloca (size + 1); |
1159 | memcpy (data, data_src, size); | |
1160 | data[size] = DW_OP_stack_value; | |
e18b2753 | 1161 | |
a471c594 | 1162 | return dwarf2_evaluate_loc_desc (type, caller_frame, data, size + 1, per_cu); |
e18b2753 JK |
1163 | } |
1164 | ||
24c5c679 JK |
1165 | /* Execute DWARF block of call_site_parameter which matches KIND and KIND_U. |
1166 | Choose DEREF_SIZE value of that parameter. Search caller of the CTX's | |
1167 | frame. CTX must be of dwarf_expr_ctx_funcs kind. | |
8e3b41a9 JK |
1168 | |
1169 | The CTX caller can be from a different CU - per_cu_dwarf_call implementation | |
1170 | can be more simple as it does not support cross-CU DWARF executions. */ | |
1171 | ||
1172 | static void | |
1173 | dwarf_expr_push_dwarf_reg_entry_value (struct dwarf_expr_context *ctx, | |
24c5c679 JK |
1174 | enum call_site_parameter_kind kind, |
1175 | union call_site_parameter_u kind_u, | |
a471c594 | 1176 | int deref_size) |
8e3b41a9 JK |
1177 | { |
1178 | struct dwarf_expr_baton *debaton; | |
1179 | struct frame_info *frame, *caller_frame; | |
1180 | struct dwarf2_per_cu_data *caller_per_cu; | |
1181 | struct dwarf_expr_baton baton_local; | |
1182 | struct dwarf_expr_context saved_ctx; | |
1183 | struct call_site_parameter *parameter; | |
1184 | const gdb_byte *data_src; | |
1185 | size_t size; | |
1186 | ||
1187 | gdb_assert (ctx->funcs == &dwarf_expr_ctx_funcs); | |
1188 | debaton = ctx->baton; | |
1189 | frame = debaton->frame; | |
1190 | caller_frame = get_prev_frame (frame); | |
1191 | ||
24c5c679 | 1192 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
8e3b41a9 | 1193 | &caller_per_cu); |
a471c594 JK |
1194 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; |
1195 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1196 | ||
1197 | /* DEREF_SIZE size is not verified here. */ | |
1198 | if (data_src == NULL) | |
1199 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1200 | _("Cannot resolve DW_AT_GNU_call_site_data_value")); | |
8e3b41a9 JK |
1201 | |
1202 | baton_local.frame = caller_frame; | |
1203 | baton_local.per_cu = caller_per_cu; | |
1204 | ||
1205 | saved_ctx.gdbarch = ctx->gdbarch; | |
1206 | saved_ctx.addr_size = ctx->addr_size; | |
1207 | saved_ctx.offset = ctx->offset; | |
1208 | saved_ctx.baton = ctx->baton; | |
1209 | ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (baton_local.per_cu)); | |
1210 | ctx->addr_size = dwarf2_per_cu_addr_size (baton_local.per_cu); | |
1211 | ctx->offset = dwarf2_per_cu_text_offset (baton_local.per_cu); | |
1212 | ctx->baton = &baton_local; | |
1213 | ||
1214 | dwarf_expr_eval (ctx, data_src, size); | |
1215 | ||
1216 | ctx->gdbarch = saved_ctx.gdbarch; | |
1217 | ctx->addr_size = saved_ctx.addr_size; | |
1218 | ctx->offset = saved_ctx.offset; | |
1219 | ctx->baton = saved_ctx.baton; | |
1220 | } | |
1221 | ||
3019eac3 DE |
1222 | /* Callback function for dwarf2_evaluate_loc_desc. |
1223 | Fetch the address indexed by DW_OP_GNU_addr_index. */ | |
1224 | ||
1225 | static CORE_ADDR | |
1226 | dwarf_expr_get_addr_index (void *baton, unsigned int index) | |
1227 | { | |
1228 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
1229 | ||
1230 | return dwarf2_read_addr_index (debaton->per_cu, index); | |
1231 | } | |
1232 | ||
a471c594 JK |
1233 | /* VALUE must be of type lval_computed with entry_data_value_funcs. Perform |
1234 | the indirect method on it, that is use its stored target value, the sole | |
1235 | purpose of entry_data_value_funcs.. */ | |
1236 | ||
1237 | static struct value * | |
1238 | entry_data_value_coerce_ref (const struct value *value) | |
1239 | { | |
1240 | struct type *checked_type = check_typedef (value_type (value)); | |
1241 | struct value *target_val; | |
1242 | ||
1243 | if (TYPE_CODE (checked_type) != TYPE_CODE_REF) | |
1244 | return NULL; | |
1245 | ||
1246 | target_val = value_computed_closure (value); | |
1247 | value_incref (target_val); | |
1248 | return target_val; | |
1249 | } | |
1250 | ||
1251 | /* Implement copy_closure. */ | |
1252 | ||
1253 | static void * | |
1254 | entry_data_value_copy_closure (const struct value *v) | |
1255 | { | |
1256 | struct value *target_val = value_computed_closure (v); | |
1257 | ||
1258 | value_incref (target_val); | |
1259 | return target_val; | |
1260 | } | |
1261 | ||
1262 | /* Implement free_closure. */ | |
1263 | ||
1264 | static void | |
1265 | entry_data_value_free_closure (struct value *v) | |
1266 | { | |
1267 | struct value *target_val = value_computed_closure (v); | |
1268 | ||
1269 | value_free (target_val); | |
1270 | } | |
1271 | ||
1272 | /* Vector for methods for an entry value reference where the referenced value | |
1273 | is stored in the caller. On the first dereference use | |
1274 | DW_AT_GNU_call_site_data_value in the caller. */ | |
1275 | ||
1276 | static const struct lval_funcs entry_data_value_funcs = | |
1277 | { | |
1278 | NULL, /* read */ | |
1279 | NULL, /* write */ | |
1280 | NULL, /* check_validity */ | |
1281 | NULL, /* check_any_valid */ | |
1282 | NULL, /* indirect */ | |
1283 | entry_data_value_coerce_ref, | |
1284 | NULL, /* check_synthetic_pointer */ | |
1285 | entry_data_value_copy_closure, | |
1286 | entry_data_value_free_closure | |
1287 | }; | |
1288 | ||
24c5c679 JK |
1289 | /* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U |
1290 | are used to match DW_AT_location at the caller's | |
1291 | DW_TAG_GNU_call_site_parameter. | |
e18b2753 JK |
1292 | |
1293 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1294 | cannot resolve the parameter for any reason. */ | |
1295 | ||
1296 | static struct value * | |
1297 | value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame, | |
24c5c679 JK |
1298 | enum call_site_parameter_kind kind, |
1299 | union call_site_parameter_u kind_u) | |
e18b2753 | 1300 | { |
a471c594 JK |
1301 | struct type *checked_type = check_typedef (type); |
1302 | struct type *target_type = TYPE_TARGET_TYPE (checked_type); | |
e18b2753 | 1303 | struct frame_info *caller_frame = get_prev_frame (frame); |
a471c594 | 1304 | struct value *outer_val, *target_val, *val; |
e18b2753 JK |
1305 | struct call_site_parameter *parameter; |
1306 | struct dwarf2_per_cu_data *caller_per_cu; | |
a471c594 | 1307 | CORE_ADDR addr; |
e18b2753 | 1308 | |
24c5c679 | 1309 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
e18b2753 JK |
1310 | &caller_per_cu); |
1311 | ||
a471c594 JK |
1312 | outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */, |
1313 | type, caller_frame, | |
1314 | caller_per_cu); | |
1315 | ||
1316 | /* Check if DW_AT_GNU_call_site_data_value cannot be used. If it should be | |
1317 | used and it is not available do not fall back to OUTER_VAL - dereferencing | |
1318 | TYPE_CODE_REF with non-entry data value would give current value - not the | |
1319 | entry value. */ | |
1320 | ||
1321 | if (TYPE_CODE (checked_type) != TYPE_CODE_REF | |
1322 | || TYPE_TARGET_TYPE (checked_type) == NULL) | |
1323 | return outer_val; | |
1324 | ||
1325 | target_val = dwarf_entry_parameter_to_value (parameter, | |
1326 | TYPE_LENGTH (target_type), | |
1327 | target_type, caller_frame, | |
1328 | caller_per_cu); | |
1329 | ||
1330 | /* value_as_address dereferences TYPE_CODE_REF. */ | |
1331 | addr = extract_typed_address (value_contents (outer_val), checked_type); | |
1332 | ||
1333 | /* The target entry value has artificial address of the entry value | |
1334 | reference. */ | |
1335 | VALUE_LVAL (target_val) = lval_memory; | |
1336 | set_value_address (target_val, addr); | |
1337 | ||
1338 | release_value (target_val); | |
1339 | val = allocate_computed_value (type, &entry_data_value_funcs, | |
1340 | target_val /* closure */); | |
1341 | ||
1342 | /* Copy the referencing pointer to the new computed value. */ | |
1343 | memcpy (value_contents_raw (val), value_contents_raw (outer_val), | |
1344 | TYPE_LENGTH (checked_type)); | |
1345 | set_value_lazy (val, 0); | |
1346 | ||
1347 | return val; | |
e18b2753 JK |
1348 | } |
1349 | ||
1350 | /* Read parameter of TYPE at (callee) FRAME's function entry. DATA and | |
1351 | SIZE are DWARF block used to match DW_AT_location at the caller's | |
1352 | DW_TAG_GNU_call_site_parameter. | |
1353 | ||
1354 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1355 | cannot resolve the parameter for any reason. */ | |
1356 | ||
1357 | static struct value * | |
1358 | value_of_dwarf_block_entry (struct type *type, struct frame_info *frame, | |
1359 | const gdb_byte *block, size_t block_len) | |
1360 | { | |
24c5c679 | 1361 | union call_site_parameter_u kind_u; |
e18b2753 | 1362 | |
24c5c679 JK |
1363 | kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len); |
1364 | if (kind_u.dwarf_reg != -1) | |
1365 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG, | |
1366 | kind_u); | |
e18b2753 | 1367 | |
24c5c679 JK |
1368 | if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset)) |
1369 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET, | |
1370 | kind_u); | |
e18b2753 JK |
1371 | |
1372 | /* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message | |
1373 | suppressed during normal operation. The expression can be arbitrary if | |
1374 | there is no caller-callee entry value binding expected. */ | |
1375 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1376 | _("DWARF-2 expression error: DW_OP_GNU_entry_value is supported " | |
1377 | "only for single DW_OP_reg* or for DW_OP_fbreg(*)")); | |
1378 | } | |
1379 | ||
052b9502 NF |
1380 | struct piece_closure |
1381 | { | |
88bfdde4 TT |
1382 | /* Reference count. */ |
1383 | int refc; | |
1384 | ||
8cf6f0b1 TT |
1385 | /* The CU from which this closure's expression came. */ |
1386 | struct dwarf2_per_cu_data *per_cu; | |
1387 | ||
052b9502 NF |
1388 | /* The number of pieces used to describe this variable. */ |
1389 | int n_pieces; | |
1390 | ||
6063c216 UW |
1391 | /* The target address size, used only for DWARF_VALUE_STACK. */ |
1392 | int addr_size; | |
cec03d70 | 1393 | |
052b9502 NF |
1394 | /* The pieces themselves. */ |
1395 | struct dwarf_expr_piece *pieces; | |
1396 | }; | |
1397 | ||
1398 | /* Allocate a closure for a value formed from separately-described | |
1399 | PIECES. */ | |
1400 | ||
1401 | static struct piece_closure * | |
8cf6f0b1 TT |
1402 | allocate_piece_closure (struct dwarf2_per_cu_data *per_cu, |
1403 | int n_pieces, struct dwarf_expr_piece *pieces, | |
6063c216 | 1404 | int addr_size) |
052b9502 NF |
1405 | { |
1406 | struct piece_closure *c = XZALLOC (struct piece_closure); | |
8a9b8146 | 1407 | int i; |
052b9502 | 1408 | |
88bfdde4 | 1409 | c->refc = 1; |
8cf6f0b1 | 1410 | c->per_cu = per_cu; |
052b9502 | 1411 | c->n_pieces = n_pieces; |
6063c216 | 1412 | c->addr_size = addr_size; |
052b9502 NF |
1413 | c->pieces = XCALLOC (n_pieces, struct dwarf_expr_piece); |
1414 | ||
1415 | memcpy (c->pieces, pieces, n_pieces * sizeof (struct dwarf_expr_piece)); | |
8a9b8146 TT |
1416 | for (i = 0; i < n_pieces; ++i) |
1417 | if (c->pieces[i].location == DWARF_VALUE_STACK) | |
1418 | value_incref (c->pieces[i].v.value); | |
052b9502 NF |
1419 | |
1420 | return c; | |
1421 | } | |
1422 | ||
d3b1e874 TT |
1423 | /* The lowest-level function to extract bits from a byte buffer. |
1424 | SOURCE is the buffer. It is updated if we read to the end of a | |
1425 | byte. | |
1426 | SOURCE_OFFSET_BITS is the offset of the first bit to read. It is | |
1427 | updated to reflect the number of bits actually read. | |
1428 | NBITS is the number of bits we want to read. It is updated to | |
1429 | reflect the number of bits actually read. This function may read | |
1430 | fewer bits. | |
1431 | BITS_BIG_ENDIAN is taken directly from gdbarch. | |
1432 | This function returns the extracted bits. */ | |
1433 | ||
1434 | static unsigned int | |
1435 | extract_bits_primitive (const gdb_byte **source, | |
1436 | unsigned int *source_offset_bits, | |
1437 | int *nbits, int bits_big_endian) | |
1438 | { | |
1439 | unsigned int avail, mask, datum; | |
1440 | ||
1441 | gdb_assert (*source_offset_bits < 8); | |
1442 | ||
1443 | avail = 8 - *source_offset_bits; | |
1444 | if (avail > *nbits) | |
1445 | avail = *nbits; | |
1446 | ||
1447 | mask = (1 << avail) - 1; | |
1448 | datum = **source; | |
1449 | if (bits_big_endian) | |
1450 | datum >>= 8 - (*source_offset_bits + *nbits); | |
1451 | else | |
1452 | datum >>= *source_offset_bits; | |
1453 | datum &= mask; | |
1454 | ||
1455 | *nbits -= avail; | |
1456 | *source_offset_bits += avail; | |
1457 | if (*source_offset_bits >= 8) | |
1458 | { | |
1459 | *source_offset_bits -= 8; | |
1460 | ++*source; | |
1461 | } | |
1462 | ||
1463 | return datum; | |
1464 | } | |
1465 | ||
1466 | /* Extract some bits from a source buffer and move forward in the | |
1467 | buffer. | |
1468 | ||
1469 | SOURCE is the source buffer. It is updated as bytes are read. | |
1470 | SOURCE_OFFSET_BITS is the offset into SOURCE. It is updated as | |
1471 | bits are read. | |
1472 | NBITS is the number of bits to read. | |
1473 | BITS_BIG_ENDIAN is taken directly from gdbarch. | |
1474 | ||
1475 | This function returns the bits that were read. */ | |
1476 | ||
1477 | static unsigned int | |
1478 | extract_bits (const gdb_byte **source, unsigned int *source_offset_bits, | |
1479 | int nbits, int bits_big_endian) | |
1480 | { | |
1481 | unsigned int datum; | |
1482 | ||
1483 | gdb_assert (nbits > 0 && nbits <= 8); | |
1484 | ||
1485 | datum = extract_bits_primitive (source, source_offset_bits, &nbits, | |
1486 | bits_big_endian); | |
1487 | if (nbits > 0) | |
1488 | { | |
1489 | unsigned int more; | |
1490 | ||
1491 | more = extract_bits_primitive (source, source_offset_bits, &nbits, | |
1492 | bits_big_endian); | |
1493 | if (bits_big_endian) | |
1494 | datum <<= nbits; | |
1495 | else | |
1496 | more <<= nbits; | |
1497 | datum |= more; | |
1498 | } | |
1499 | ||
1500 | return datum; | |
1501 | } | |
1502 | ||
1503 | /* Write some bits into a buffer and move forward in the buffer. | |
1504 | ||
1505 | DATUM is the bits to write. The low-order bits of DATUM are used. | |
1506 | DEST is the destination buffer. It is updated as bytes are | |
1507 | written. | |
1508 | DEST_OFFSET_BITS is the bit offset in DEST at which writing is | |
1509 | done. | |
1510 | NBITS is the number of valid bits in DATUM. | |
1511 | BITS_BIG_ENDIAN is taken directly from gdbarch. */ | |
1512 | ||
1513 | static void | |
1514 | insert_bits (unsigned int datum, | |
1515 | gdb_byte *dest, unsigned int dest_offset_bits, | |
1516 | int nbits, int bits_big_endian) | |
1517 | { | |
1518 | unsigned int mask; | |
1519 | ||
8c814cdd | 1520 | gdb_assert (dest_offset_bits + nbits <= 8); |
d3b1e874 TT |
1521 | |
1522 | mask = (1 << nbits) - 1; | |
1523 | if (bits_big_endian) | |
1524 | { | |
1525 | datum <<= 8 - (dest_offset_bits + nbits); | |
1526 | mask <<= 8 - (dest_offset_bits + nbits); | |
1527 | } | |
1528 | else | |
1529 | { | |
1530 | datum <<= dest_offset_bits; | |
1531 | mask <<= dest_offset_bits; | |
1532 | } | |
1533 | ||
1534 | gdb_assert ((datum & ~mask) == 0); | |
1535 | ||
1536 | *dest = (*dest & ~mask) | datum; | |
1537 | } | |
1538 | ||
1539 | /* Copy bits from a source to a destination. | |
1540 | ||
1541 | DEST is where the bits should be written. | |
1542 | DEST_OFFSET_BITS is the bit offset into DEST. | |
1543 | SOURCE is the source of bits. | |
1544 | SOURCE_OFFSET_BITS is the bit offset into SOURCE. | |
1545 | BIT_COUNT is the number of bits to copy. | |
1546 | BITS_BIG_ENDIAN is taken directly from gdbarch. */ | |
1547 | ||
1548 | static void | |
1549 | copy_bitwise (gdb_byte *dest, unsigned int dest_offset_bits, | |
1550 | const gdb_byte *source, unsigned int source_offset_bits, | |
1551 | unsigned int bit_count, | |
1552 | int bits_big_endian) | |
1553 | { | |
1554 | unsigned int dest_avail; | |
1555 | int datum; | |
1556 | ||
1557 | /* Reduce everything to byte-size pieces. */ | |
1558 | dest += dest_offset_bits / 8; | |
1559 | dest_offset_bits %= 8; | |
1560 | source += source_offset_bits / 8; | |
1561 | source_offset_bits %= 8; | |
1562 | ||
1563 | dest_avail = 8 - dest_offset_bits % 8; | |
1564 | ||
1565 | /* See if we can fill the first destination byte. */ | |
1566 | if (dest_avail < bit_count) | |
1567 | { | |
1568 | datum = extract_bits (&source, &source_offset_bits, dest_avail, | |
1569 | bits_big_endian); | |
1570 | insert_bits (datum, dest, dest_offset_bits, dest_avail, bits_big_endian); | |
1571 | ++dest; | |
1572 | dest_offset_bits = 0; | |
1573 | bit_count -= dest_avail; | |
1574 | } | |
1575 | ||
1576 | /* Now, either DEST_OFFSET_BITS is byte-aligned, or we have fewer | |
1577 | than 8 bits remaining. */ | |
1578 | gdb_assert (dest_offset_bits % 8 == 0 || bit_count < 8); | |
1579 | for (; bit_count >= 8; bit_count -= 8) | |
1580 | { | |
1581 | datum = extract_bits (&source, &source_offset_bits, 8, bits_big_endian); | |
1582 | *dest++ = (gdb_byte) datum; | |
1583 | } | |
1584 | ||
1585 | /* Finally, we may have a few leftover bits. */ | |
1586 | gdb_assert (bit_count <= 8 - dest_offset_bits % 8); | |
1587 | if (bit_count > 0) | |
1588 | { | |
1589 | datum = extract_bits (&source, &source_offset_bits, bit_count, | |
1590 | bits_big_endian); | |
1591 | insert_bits (datum, dest, dest_offset_bits, bit_count, bits_big_endian); | |
1592 | } | |
1593 | } | |
1594 | ||
052b9502 NF |
1595 | static void |
1596 | read_pieced_value (struct value *v) | |
1597 | { | |
1598 | int i; | |
1599 | long offset = 0; | |
d3b1e874 | 1600 | ULONGEST bits_to_skip; |
052b9502 | 1601 | gdb_byte *contents; |
3e43a32a MS |
1602 | struct piece_closure *c |
1603 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 1604 | struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (v)); |
afd74c5f | 1605 | size_t type_len; |
d3b1e874 | 1606 | size_t buffer_size = 0; |
948f8e3d | 1607 | gdb_byte *buffer = NULL; |
d3b1e874 TT |
1608 | struct cleanup *cleanup; |
1609 | int bits_big_endian | |
1610 | = gdbarch_bits_big_endian (get_type_arch (value_type (v))); | |
afd74c5f TT |
1611 | |
1612 | if (value_type (v) != value_enclosing_type (v)) | |
1613 | internal_error (__FILE__, __LINE__, | |
1614 | _("Should not be able to create a lazy value with " | |
1615 | "an enclosing type")); | |
052b9502 | 1616 | |
d3b1e874 TT |
1617 | cleanup = make_cleanup (free_current_contents, &buffer); |
1618 | ||
052b9502 | 1619 | contents = value_contents_raw (v); |
d3b1e874 | 1620 | bits_to_skip = 8 * value_offset (v); |
0e03807e TT |
1621 | if (value_bitsize (v)) |
1622 | { | |
1623 | bits_to_skip += value_bitpos (v); | |
1624 | type_len = value_bitsize (v); | |
1625 | } | |
1626 | else | |
1627 | type_len = 8 * TYPE_LENGTH (value_type (v)); | |
d3b1e874 | 1628 | |
afd74c5f | 1629 | for (i = 0; i < c->n_pieces && offset < type_len; i++) |
052b9502 NF |
1630 | { |
1631 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
d3b1e874 TT |
1632 | size_t this_size, this_size_bits; |
1633 | long dest_offset_bits, source_offset_bits, source_offset; | |
0d45f56e | 1634 | const gdb_byte *intermediate_buffer; |
d3b1e874 TT |
1635 | |
1636 | /* Compute size, source, and destination offsets for copying, in | |
1637 | bits. */ | |
1638 | this_size_bits = p->size; | |
1639 | if (bits_to_skip > 0 && bits_to_skip >= this_size_bits) | |
afd74c5f | 1640 | { |
d3b1e874 | 1641 | bits_to_skip -= this_size_bits; |
afd74c5f TT |
1642 | continue; |
1643 | } | |
d3b1e874 TT |
1644 | if (this_size_bits > type_len - offset) |
1645 | this_size_bits = type_len - offset; | |
1646 | if (bits_to_skip > 0) | |
afd74c5f | 1647 | { |
d3b1e874 TT |
1648 | dest_offset_bits = 0; |
1649 | source_offset_bits = bits_to_skip; | |
1650 | this_size_bits -= bits_to_skip; | |
1651 | bits_to_skip = 0; | |
afd74c5f TT |
1652 | } |
1653 | else | |
1654 | { | |
d3b1e874 TT |
1655 | dest_offset_bits = offset; |
1656 | source_offset_bits = 0; | |
afd74c5f | 1657 | } |
9a619af0 | 1658 | |
d3b1e874 TT |
1659 | this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8; |
1660 | source_offset = source_offset_bits / 8; | |
1661 | if (buffer_size < this_size) | |
1662 | { | |
1663 | buffer_size = this_size; | |
1664 | buffer = xrealloc (buffer, buffer_size); | |
1665 | } | |
1666 | intermediate_buffer = buffer; | |
1667 | ||
1668 | /* Copy from the source to DEST_BUFFER. */ | |
cec03d70 | 1669 | switch (p->location) |
052b9502 | 1670 | { |
cec03d70 TT |
1671 | case DWARF_VALUE_REGISTER: |
1672 | { | |
1673 | struct gdbarch *arch = get_frame_arch (frame); | |
8a9b8146 | 1674 | int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, p->v.regno); |
afd74c5f | 1675 | int reg_offset = source_offset; |
dcbf108f UW |
1676 | |
1677 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG | |
afd74c5f | 1678 | && this_size < register_size (arch, gdb_regnum)) |
d3b1e874 TT |
1679 | { |
1680 | /* Big-endian, and we want less than full size. */ | |
1681 | reg_offset = register_size (arch, gdb_regnum) - this_size; | |
1682 | /* We want the lower-order THIS_SIZE_BITS of the bytes | |
1683 | we extract from the register. */ | |
1684 | source_offset_bits += 8 * this_size - this_size_bits; | |
1685 | } | |
dcbf108f | 1686 | |
63b4f126 MGD |
1687 | if (gdb_regnum != -1) |
1688 | { | |
8dccd430 PA |
1689 | int optim, unavail; |
1690 | ||
1691 | if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset, | |
1692 | this_size, buffer, | |
1693 | &optim, &unavail)) | |
1694 | { | |
1695 | /* Just so garbage doesn't ever shine through. */ | |
1696 | memset (buffer, 0, this_size); | |
1697 | ||
1698 | if (optim) | |
1699 | set_value_optimized_out (v, 1); | |
1700 | if (unavail) | |
1701 | mark_value_bytes_unavailable (v, offset, this_size); | |
1702 | } | |
63b4f126 MGD |
1703 | } |
1704 | else | |
1705 | { | |
1706 | error (_("Unable to access DWARF register number %s"), | |
8a9b8146 | 1707 | paddress (arch, p->v.regno)); |
63b4f126 | 1708 | } |
cec03d70 TT |
1709 | } |
1710 | break; | |
1711 | ||
1712 | case DWARF_VALUE_MEMORY: | |
e6ca34fc PA |
1713 | read_value_memory (v, offset, |
1714 | p->v.mem.in_stack_memory, | |
1715 | p->v.mem.addr + source_offset, | |
1716 | buffer, this_size); | |
cec03d70 TT |
1717 | break; |
1718 | ||
1719 | case DWARF_VALUE_STACK: | |
1720 | { | |
afd74c5f | 1721 | size_t n = this_size; |
9a619af0 | 1722 | |
afd74c5f TT |
1723 | if (n > c->addr_size - source_offset) |
1724 | n = (c->addr_size >= source_offset | |
1725 | ? c->addr_size - source_offset | |
1726 | : 0); | |
1727 | if (n == 0) | |
1728 | { | |
1729 | /* Nothing. */ | |
1730 | } | |
afd74c5f TT |
1731 | else |
1732 | { | |
8a9b8146 | 1733 | const gdb_byte *val_bytes = value_contents_all (p->v.value); |
afd74c5f | 1734 | |
8a9b8146 | 1735 | intermediate_buffer = val_bytes + source_offset; |
afd74c5f | 1736 | } |
cec03d70 TT |
1737 | } |
1738 | break; | |
1739 | ||
1740 | case DWARF_VALUE_LITERAL: | |
1741 | { | |
afd74c5f TT |
1742 | size_t n = this_size; |
1743 | ||
1744 | if (n > p->v.literal.length - source_offset) | |
1745 | n = (p->v.literal.length >= source_offset | |
1746 | ? p->v.literal.length - source_offset | |
1747 | : 0); | |
1748 | if (n != 0) | |
d3b1e874 | 1749 | intermediate_buffer = p->v.literal.data + source_offset; |
cec03d70 TT |
1750 | } |
1751 | break; | |
1752 | ||
8cf6f0b1 TT |
1753 | /* These bits show up as zeros -- but do not cause the value |
1754 | to be considered optimized-out. */ | |
1755 | case DWARF_VALUE_IMPLICIT_POINTER: | |
1756 | break; | |
1757 | ||
cb826367 | 1758 | case DWARF_VALUE_OPTIMIZED_OUT: |
0e03807e | 1759 | set_value_optimized_out (v, 1); |
cb826367 TT |
1760 | break; |
1761 | ||
cec03d70 TT |
1762 | default: |
1763 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
052b9502 | 1764 | } |
d3b1e874 | 1765 | |
8cf6f0b1 TT |
1766 | if (p->location != DWARF_VALUE_OPTIMIZED_OUT |
1767 | && p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
d3b1e874 TT |
1768 | copy_bitwise (contents, dest_offset_bits, |
1769 | intermediate_buffer, source_offset_bits % 8, | |
1770 | this_size_bits, bits_big_endian); | |
1771 | ||
1772 | offset += this_size_bits; | |
052b9502 | 1773 | } |
d3b1e874 TT |
1774 | |
1775 | do_cleanups (cleanup); | |
052b9502 NF |
1776 | } |
1777 | ||
1778 | static void | |
1779 | write_pieced_value (struct value *to, struct value *from) | |
1780 | { | |
1781 | int i; | |
1782 | long offset = 0; | |
d3b1e874 | 1783 | ULONGEST bits_to_skip; |
afd74c5f | 1784 | const gdb_byte *contents; |
3e43a32a MS |
1785 | struct piece_closure *c |
1786 | = (struct piece_closure *) value_computed_closure (to); | |
052b9502 | 1787 | struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (to)); |
afd74c5f | 1788 | size_t type_len; |
d3b1e874 | 1789 | size_t buffer_size = 0; |
948f8e3d | 1790 | gdb_byte *buffer = NULL; |
d3b1e874 TT |
1791 | struct cleanup *cleanup; |
1792 | int bits_big_endian | |
1793 | = gdbarch_bits_big_endian (get_type_arch (value_type (to))); | |
052b9502 NF |
1794 | |
1795 | if (frame == NULL) | |
1796 | { | |
1797 | set_value_optimized_out (to, 1); | |
1798 | return; | |
1799 | } | |
1800 | ||
d3b1e874 TT |
1801 | cleanup = make_cleanup (free_current_contents, &buffer); |
1802 | ||
afd74c5f | 1803 | contents = value_contents (from); |
d3b1e874 | 1804 | bits_to_skip = 8 * value_offset (to); |
0e03807e TT |
1805 | if (value_bitsize (to)) |
1806 | { | |
1807 | bits_to_skip += value_bitpos (to); | |
1808 | type_len = value_bitsize (to); | |
1809 | } | |
1810 | else | |
1811 | type_len = 8 * TYPE_LENGTH (value_type (to)); | |
1812 | ||
afd74c5f | 1813 | for (i = 0; i < c->n_pieces && offset < type_len; i++) |
052b9502 NF |
1814 | { |
1815 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
d3b1e874 TT |
1816 | size_t this_size_bits, this_size; |
1817 | long dest_offset_bits, source_offset_bits, dest_offset, source_offset; | |
1818 | int need_bitwise; | |
1819 | const gdb_byte *source_buffer; | |
afd74c5f | 1820 | |
d3b1e874 TT |
1821 | this_size_bits = p->size; |
1822 | if (bits_to_skip > 0 && bits_to_skip >= this_size_bits) | |
afd74c5f | 1823 | { |
d3b1e874 | 1824 | bits_to_skip -= this_size_bits; |
afd74c5f TT |
1825 | continue; |
1826 | } | |
d3b1e874 TT |
1827 | if (this_size_bits > type_len - offset) |
1828 | this_size_bits = type_len - offset; | |
1829 | if (bits_to_skip > 0) | |
afd74c5f | 1830 | { |
d3b1e874 TT |
1831 | dest_offset_bits = bits_to_skip; |
1832 | source_offset_bits = 0; | |
1833 | this_size_bits -= bits_to_skip; | |
1834 | bits_to_skip = 0; | |
afd74c5f TT |
1835 | } |
1836 | else | |
1837 | { | |
d3b1e874 TT |
1838 | dest_offset_bits = 0; |
1839 | source_offset_bits = offset; | |
1840 | } | |
1841 | ||
1842 | this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8; | |
1843 | source_offset = source_offset_bits / 8; | |
1844 | dest_offset = dest_offset_bits / 8; | |
1845 | if (dest_offset_bits % 8 == 0 && source_offset_bits % 8 == 0) | |
1846 | { | |
1847 | source_buffer = contents + source_offset; | |
1848 | need_bitwise = 0; | |
1849 | } | |
1850 | else | |
1851 | { | |
1852 | if (buffer_size < this_size) | |
1853 | { | |
1854 | buffer_size = this_size; | |
1855 | buffer = xrealloc (buffer, buffer_size); | |
1856 | } | |
1857 | source_buffer = buffer; | |
1858 | need_bitwise = 1; | |
afd74c5f | 1859 | } |
9a619af0 | 1860 | |
cec03d70 | 1861 | switch (p->location) |
052b9502 | 1862 | { |
cec03d70 TT |
1863 | case DWARF_VALUE_REGISTER: |
1864 | { | |
1865 | struct gdbarch *arch = get_frame_arch (frame); | |
8a9b8146 | 1866 | int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, p->v.regno); |
afd74c5f | 1867 | int reg_offset = dest_offset; |
dcbf108f UW |
1868 | |
1869 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG | |
afd74c5f | 1870 | && this_size <= register_size (arch, gdb_regnum)) |
dcbf108f | 1871 | /* Big-endian, and we want less than full size. */ |
afd74c5f | 1872 | reg_offset = register_size (arch, gdb_regnum) - this_size; |
dcbf108f | 1873 | |
63b4f126 MGD |
1874 | if (gdb_regnum != -1) |
1875 | { | |
d3b1e874 TT |
1876 | if (need_bitwise) |
1877 | { | |
8dccd430 PA |
1878 | int optim, unavail; |
1879 | ||
1880 | if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset, | |
1881 | this_size, buffer, | |
1882 | &optim, &unavail)) | |
1883 | { | |
1884 | if (optim) | |
1885 | error (_("Can't do read-modify-write to " | |
1886 | "update bitfield; containing word has been " | |
1887 | "optimized out")); | |
1888 | if (unavail) | |
1889 | throw_error (NOT_AVAILABLE_ERROR, | |
1890 | _("Can't do read-modify-write to update " | |
1891 | "bitfield; containing word " | |
1892 | "is unavailable")); | |
1893 | } | |
d3b1e874 TT |
1894 | copy_bitwise (buffer, dest_offset_bits, |
1895 | contents, source_offset_bits, | |
1896 | this_size_bits, | |
1897 | bits_big_endian); | |
1898 | } | |
1899 | ||
63b4f126 | 1900 | put_frame_register_bytes (frame, gdb_regnum, reg_offset, |
d3b1e874 | 1901 | this_size, source_buffer); |
63b4f126 MGD |
1902 | } |
1903 | else | |
1904 | { | |
1905 | error (_("Unable to write to DWARF register number %s"), | |
8a9b8146 | 1906 | paddress (arch, p->v.regno)); |
63b4f126 | 1907 | } |
cec03d70 TT |
1908 | } |
1909 | break; | |
1910 | case DWARF_VALUE_MEMORY: | |
d3b1e874 TT |
1911 | if (need_bitwise) |
1912 | { | |
1913 | /* Only the first and last bytes can possibly have any | |
1914 | bits reused. */ | |
f2c7657e UW |
1915 | read_memory (p->v.mem.addr + dest_offset, buffer, 1); |
1916 | read_memory (p->v.mem.addr + dest_offset + this_size - 1, | |
d3b1e874 TT |
1917 | buffer + this_size - 1, 1); |
1918 | copy_bitwise (buffer, dest_offset_bits, | |
1919 | contents, source_offset_bits, | |
1920 | this_size_bits, | |
1921 | bits_big_endian); | |
1922 | } | |
1923 | ||
f2c7657e | 1924 | write_memory (p->v.mem.addr + dest_offset, |
d3b1e874 | 1925 | source_buffer, this_size); |
cec03d70 TT |
1926 | break; |
1927 | default: | |
1928 | set_value_optimized_out (to, 1); | |
0e03807e | 1929 | break; |
052b9502 | 1930 | } |
d3b1e874 | 1931 | offset += this_size_bits; |
052b9502 | 1932 | } |
d3b1e874 | 1933 | |
d3b1e874 | 1934 | do_cleanups (cleanup); |
052b9502 NF |
1935 | } |
1936 | ||
8cf6f0b1 TT |
1937 | /* A helper function that checks bit validity in a pieced value. |
1938 | CHECK_FOR indicates the kind of validity checking. | |
1939 | DWARF_VALUE_MEMORY means to check whether any bit is valid. | |
1940 | DWARF_VALUE_OPTIMIZED_OUT means to check whether any bit is | |
1941 | optimized out. | |
1942 | DWARF_VALUE_IMPLICIT_POINTER means to check whether the bits are an | |
1943 | implicit pointer. */ | |
1944 | ||
0e03807e TT |
1945 | static int |
1946 | check_pieced_value_bits (const struct value *value, int bit_offset, | |
8cf6f0b1 TT |
1947 | int bit_length, |
1948 | enum dwarf_value_location check_for) | |
0e03807e TT |
1949 | { |
1950 | struct piece_closure *c | |
1951 | = (struct piece_closure *) value_computed_closure (value); | |
1952 | int i; | |
8cf6f0b1 TT |
1953 | int validity = (check_for == DWARF_VALUE_MEMORY |
1954 | || check_for == DWARF_VALUE_IMPLICIT_POINTER); | |
0e03807e TT |
1955 | |
1956 | bit_offset += 8 * value_offset (value); | |
1957 | if (value_bitsize (value)) | |
1958 | bit_offset += value_bitpos (value); | |
1959 | ||
1960 | for (i = 0; i < c->n_pieces && bit_length > 0; i++) | |
1961 | { | |
1962 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
1963 | size_t this_size_bits = p->size; | |
1964 | ||
1965 | if (bit_offset > 0) | |
1966 | { | |
1967 | if (bit_offset >= this_size_bits) | |
1968 | { | |
1969 | bit_offset -= this_size_bits; | |
1970 | continue; | |
1971 | } | |
1972 | ||
1973 | bit_length -= this_size_bits - bit_offset; | |
1974 | bit_offset = 0; | |
1975 | } | |
1976 | else | |
1977 | bit_length -= this_size_bits; | |
1978 | ||
8cf6f0b1 TT |
1979 | if (check_for == DWARF_VALUE_IMPLICIT_POINTER) |
1980 | { | |
1981 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
1982 | return 0; | |
1983 | } | |
1984 | else if (p->location == DWARF_VALUE_OPTIMIZED_OUT | |
1985 | || p->location == DWARF_VALUE_IMPLICIT_POINTER) | |
0e03807e TT |
1986 | { |
1987 | if (validity) | |
1988 | return 0; | |
1989 | } | |
1990 | else | |
1991 | { | |
1992 | if (!validity) | |
1993 | return 1; | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | return validity; | |
1998 | } | |
1999 | ||
2000 | static int | |
2001 | check_pieced_value_validity (const struct value *value, int bit_offset, | |
2002 | int bit_length) | |
2003 | { | |
8cf6f0b1 TT |
2004 | return check_pieced_value_bits (value, bit_offset, bit_length, |
2005 | DWARF_VALUE_MEMORY); | |
0e03807e TT |
2006 | } |
2007 | ||
2008 | static int | |
2009 | check_pieced_value_invalid (const struct value *value) | |
2010 | { | |
2011 | return check_pieced_value_bits (value, 0, | |
8cf6f0b1 TT |
2012 | 8 * TYPE_LENGTH (value_type (value)), |
2013 | DWARF_VALUE_OPTIMIZED_OUT); | |
2014 | } | |
2015 | ||
2016 | /* An implementation of an lval_funcs method to see whether a value is | |
2017 | a synthetic pointer. */ | |
2018 | ||
2019 | static int | |
2020 | check_pieced_synthetic_pointer (const struct value *value, int bit_offset, | |
2021 | int bit_length) | |
2022 | { | |
2023 | return check_pieced_value_bits (value, bit_offset, bit_length, | |
2024 | DWARF_VALUE_IMPLICIT_POINTER); | |
2025 | } | |
2026 | ||
2027 | /* A wrapper function for get_frame_address_in_block. */ | |
2028 | ||
2029 | static CORE_ADDR | |
2030 | get_frame_address_in_block_wrapper (void *baton) | |
2031 | { | |
2032 | return get_frame_address_in_block (baton); | |
2033 | } | |
2034 | ||
2035 | /* An implementation of an lval_funcs method to indirect through a | |
2036 | pointer. This handles the synthetic pointer case when needed. */ | |
2037 | ||
2038 | static struct value * | |
2039 | indirect_pieced_value (struct value *value) | |
2040 | { | |
2041 | struct piece_closure *c | |
2042 | = (struct piece_closure *) value_computed_closure (value); | |
2043 | struct type *type; | |
2044 | struct frame_info *frame; | |
2045 | struct dwarf2_locexpr_baton baton; | |
2046 | int i, bit_offset, bit_length; | |
2047 | struct dwarf_expr_piece *piece = NULL; | |
8cf6f0b1 TT |
2048 | LONGEST byte_offset; |
2049 | ||
0e37a63c | 2050 | type = check_typedef (value_type (value)); |
8cf6f0b1 TT |
2051 | if (TYPE_CODE (type) != TYPE_CODE_PTR) |
2052 | return NULL; | |
2053 | ||
2054 | bit_length = 8 * TYPE_LENGTH (type); | |
2055 | bit_offset = 8 * value_offset (value); | |
2056 | if (value_bitsize (value)) | |
2057 | bit_offset += value_bitpos (value); | |
2058 | ||
2059 | for (i = 0; i < c->n_pieces && bit_length > 0; i++) | |
2060 | { | |
2061 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2062 | size_t this_size_bits = p->size; | |
2063 | ||
2064 | if (bit_offset > 0) | |
2065 | { | |
2066 | if (bit_offset >= this_size_bits) | |
2067 | { | |
2068 | bit_offset -= this_size_bits; | |
2069 | continue; | |
2070 | } | |
2071 | ||
2072 | bit_length -= this_size_bits - bit_offset; | |
2073 | bit_offset = 0; | |
2074 | } | |
2075 | else | |
2076 | bit_length -= this_size_bits; | |
2077 | ||
2078 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
2079 | return NULL; | |
2080 | ||
2081 | if (bit_length != 0) | |
2082 | error (_("Invalid use of DW_OP_GNU_implicit_pointer")); | |
2083 | ||
2084 | piece = p; | |
2085 | break; | |
2086 | } | |
2087 | ||
2088 | frame = get_selected_frame (_("No frame selected.")); | |
543305c9 JK |
2089 | |
2090 | /* This is an offset requested by GDB, such as value subcripts. */ | |
8cf6f0b1 TT |
2091 | byte_offset = value_as_address (value); |
2092 | ||
e0e40094 | 2093 | gdb_assert (piece); |
8b9737bf TT |
2094 | baton |
2095 | = dwarf2_fetch_die_loc_sect_off (piece->v.ptr.die, c->per_cu, | |
2096 | get_frame_address_in_block_wrapper, | |
2097 | frame); | |
8cf6f0b1 | 2098 | |
b6807d98 TT |
2099 | if (baton.data != NULL) |
2100 | return dwarf2_evaluate_loc_desc_full (TYPE_TARGET_TYPE (type), frame, | |
2101 | baton.data, baton.size, baton.per_cu, | |
2102 | piece->v.ptr.offset + byte_offset); | |
2103 | ||
2104 | { | |
2105 | struct obstack temp_obstack; | |
2106 | struct cleanup *cleanup; | |
2107 | const gdb_byte *bytes; | |
2108 | LONGEST len; | |
2109 | struct value *result; | |
2110 | ||
2111 | obstack_init (&temp_obstack); | |
2112 | cleanup = make_cleanup_obstack_free (&temp_obstack); | |
2113 | ||
2114 | bytes = dwarf2_fetch_constant_bytes (piece->v.ptr.die, c->per_cu, | |
2115 | &temp_obstack, &len); | |
2116 | if (bytes == NULL) | |
2117 | result = allocate_optimized_out_value (TYPE_TARGET_TYPE (type)); | |
2118 | else | |
2119 | { | |
2120 | if (byte_offset < 0 | |
2121 | || byte_offset + TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > len) | |
2122 | invalid_synthetic_pointer (); | |
2123 | bytes += byte_offset; | |
2124 | result = value_from_contents (TYPE_TARGET_TYPE (type), bytes); | |
2125 | } | |
2126 | ||
2127 | do_cleanups (cleanup); | |
2128 | return result; | |
2129 | } | |
0e03807e TT |
2130 | } |
2131 | ||
052b9502 | 2132 | static void * |
0e03807e | 2133 | copy_pieced_value_closure (const struct value *v) |
052b9502 | 2134 | { |
3e43a32a MS |
2135 | struct piece_closure *c |
2136 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2137 | |
88bfdde4 TT |
2138 | ++c->refc; |
2139 | return c; | |
052b9502 NF |
2140 | } |
2141 | ||
2142 | static void | |
2143 | free_pieced_value_closure (struct value *v) | |
2144 | { | |
3e43a32a MS |
2145 | struct piece_closure *c |
2146 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2147 | |
88bfdde4 TT |
2148 | --c->refc; |
2149 | if (c->refc == 0) | |
2150 | { | |
8a9b8146 TT |
2151 | int i; |
2152 | ||
2153 | for (i = 0; i < c->n_pieces; ++i) | |
2154 | if (c->pieces[i].location == DWARF_VALUE_STACK) | |
2155 | value_free (c->pieces[i].v.value); | |
2156 | ||
88bfdde4 TT |
2157 | xfree (c->pieces); |
2158 | xfree (c); | |
2159 | } | |
052b9502 NF |
2160 | } |
2161 | ||
2162 | /* Functions for accessing a variable described by DW_OP_piece. */ | |
c8f2448a | 2163 | static const struct lval_funcs pieced_value_funcs = { |
052b9502 NF |
2164 | read_pieced_value, |
2165 | write_pieced_value, | |
0e03807e TT |
2166 | check_pieced_value_validity, |
2167 | check_pieced_value_invalid, | |
8cf6f0b1 | 2168 | indirect_pieced_value, |
a471c594 | 2169 | NULL, /* coerce_ref */ |
8cf6f0b1 | 2170 | check_pieced_synthetic_pointer, |
052b9502 NF |
2171 | copy_pieced_value_closure, |
2172 | free_pieced_value_closure | |
2173 | }; | |
2174 | ||
9e8b7a03 JK |
2175 | /* Virtual method table for dwarf2_evaluate_loc_desc_full below. */ |
2176 | ||
2177 | static const struct dwarf_expr_context_funcs dwarf_expr_ctx_funcs = | |
2178 | { | |
2179 | dwarf_expr_read_reg, | |
2180 | dwarf_expr_read_mem, | |
2181 | dwarf_expr_frame_base, | |
2182 | dwarf_expr_frame_cfa, | |
2183 | dwarf_expr_frame_pc, | |
2184 | dwarf_expr_tls_address, | |
2185 | dwarf_expr_dwarf_call, | |
8e3b41a9 | 2186 | dwarf_expr_get_base_type, |
3019eac3 DE |
2187 | dwarf_expr_push_dwarf_reg_entry_value, |
2188 | dwarf_expr_get_addr_index | |
9e8b7a03 JK |
2189 | }; |
2190 | ||
4c2df51b | 2191 | /* Evaluate a location description, starting at DATA and with length |
8cf6f0b1 TT |
2192 | SIZE, to find the current location of variable of TYPE in the |
2193 | context of FRAME. BYTE_OFFSET is applied after the contents are | |
2194 | computed. */ | |
a2d33775 | 2195 | |
8cf6f0b1 TT |
2196 | static struct value * |
2197 | dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame, | |
56eb65bd | 2198 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2199 | struct dwarf2_per_cu_data *per_cu, |
2200 | LONGEST byte_offset) | |
4c2df51b | 2201 | { |
4c2df51b DJ |
2202 | struct value *retval; |
2203 | struct dwarf_expr_baton baton; | |
2204 | struct dwarf_expr_context *ctx; | |
72fc29ff | 2205 | struct cleanup *old_chain, *value_chain; |
ac56253d | 2206 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
79e1a869 | 2207 | volatile struct gdb_exception ex; |
4c2df51b | 2208 | |
8cf6f0b1 TT |
2209 | if (byte_offset < 0) |
2210 | invalid_synthetic_pointer (); | |
2211 | ||
0d53c4c4 | 2212 | if (size == 0) |
a7035dbb | 2213 | return allocate_optimized_out_value (type); |
0d53c4c4 | 2214 | |
4c2df51b | 2215 | baton.frame = frame; |
17ea53c3 | 2216 | baton.per_cu = per_cu; |
4c2df51b DJ |
2217 | |
2218 | ctx = new_dwarf_expr_context (); | |
4a227398 | 2219 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 2220 | value_chain = make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 2221 | |
ac56253d | 2222 | ctx->gdbarch = get_objfile_arch (objfile); |
ae0d2f24 | 2223 | ctx->addr_size = dwarf2_per_cu_addr_size (per_cu); |
181cebd4 | 2224 | ctx->ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); |
9aa1f1e3 | 2225 | ctx->offset = dwarf2_per_cu_text_offset (per_cu); |
4c2df51b | 2226 | ctx->baton = &baton; |
9e8b7a03 | 2227 | ctx->funcs = &dwarf_expr_ctx_funcs; |
4c2df51b | 2228 | |
79e1a869 PA |
2229 | TRY_CATCH (ex, RETURN_MASK_ERROR) |
2230 | { | |
2231 | dwarf_expr_eval (ctx, data, size); | |
2232 | } | |
2233 | if (ex.reason < 0) | |
2234 | { | |
2235 | if (ex.error == NOT_AVAILABLE_ERROR) | |
2236 | { | |
72fc29ff | 2237 | do_cleanups (old_chain); |
79e1a869 PA |
2238 | retval = allocate_value (type); |
2239 | mark_value_bytes_unavailable (retval, 0, TYPE_LENGTH (type)); | |
2240 | return retval; | |
2241 | } | |
8e3b41a9 JK |
2242 | else if (ex.error == NO_ENTRY_VALUE_ERROR) |
2243 | { | |
2244 | if (entry_values_debug) | |
2245 | exception_print (gdb_stdout, ex); | |
2246 | do_cleanups (old_chain); | |
2247 | return allocate_optimized_out_value (type); | |
2248 | } | |
79e1a869 PA |
2249 | else |
2250 | throw_exception (ex); | |
2251 | } | |
2252 | ||
87808bd6 JB |
2253 | if (ctx->num_pieces > 0) |
2254 | { | |
052b9502 NF |
2255 | struct piece_closure *c; |
2256 | struct frame_id frame_id = get_frame_id (frame); | |
8cf6f0b1 TT |
2257 | ULONGEST bit_size = 0; |
2258 | int i; | |
052b9502 | 2259 | |
8cf6f0b1 TT |
2260 | for (i = 0; i < ctx->num_pieces; ++i) |
2261 | bit_size += ctx->pieces[i].size; | |
2262 | if (8 * (byte_offset + TYPE_LENGTH (type)) > bit_size) | |
2263 | invalid_synthetic_pointer (); | |
2264 | ||
2265 | c = allocate_piece_closure (per_cu, ctx->num_pieces, ctx->pieces, | |
6063c216 | 2266 | ctx->addr_size); |
72fc29ff TT |
2267 | /* We must clean up the value chain after creating the piece |
2268 | closure but before allocating the result. */ | |
2269 | do_cleanups (value_chain); | |
a2d33775 | 2270 | retval = allocate_computed_value (type, &pieced_value_funcs, c); |
052b9502 | 2271 | VALUE_FRAME_ID (retval) = frame_id; |
8cf6f0b1 | 2272 | set_value_offset (retval, byte_offset); |
87808bd6 | 2273 | } |
4c2df51b DJ |
2274 | else |
2275 | { | |
cec03d70 TT |
2276 | switch (ctx->location) |
2277 | { | |
2278 | case DWARF_VALUE_REGISTER: | |
2279 | { | |
2280 | struct gdbarch *arch = get_frame_arch (frame); | |
8a9b8146 | 2281 | ULONGEST dwarf_regnum = value_as_long (dwarf_expr_fetch (ctx, 0)); |
cec03d70 | 2282 | int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_regnum); |
9a619af0 | 2283 | |
8cf6f0b1 TT |
2284 | if (byte_offset != 0) |
2285 | error (_("cannot use offset on synthetic pointer to register")); | |
72fc29ff | 2286 | do_cleanups (value_chain); |
63b4f126 | 2287 | if (gdb_regnum != -1) |
a2d33775 | 2288 | retval = value_from_register (type, gdb_regnum, frame); |
63b4f126 | 2289 | else |
a2d33775 JK |
2290 | error (_("Unable to access DWARF register number %s"), |
2291 | paddress (arch, dwarf_regnum)); | |
cec03d70 TT |
2292 | } |
2293 | break; | |
2294 | ||
2295 | case DWARF_VALUE_MEMORY: | |
2296 | { | |
f2c7657e | 2297 | CORE_ADDR address = dwarf_expr_fetch_address (ctx, 0); |
44353522 | 2298 | int in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0); |
cec03d70 | 2299 | |
72fc29ff | 2300 | do_cleanups (value_chain); |
41e8491f | 2301 | retval = allocate_value_lazy (type); |
cec03d70 | 2302 | VALUE_LVAL (retval) = lval_memory; |
44353522 DE |
2303 | if (in_stack_memory) |
2304 | set_value_stack (retval, 1); | |
8cf6f0b1 | 2305 | set_value_address (retval, address + byte_offset); |
cec03d70 TT |
2306 | } |
2307 | break; | |
2308 | ||
2309 | case DWARF_VALUE_STACK: | |
2310 | { | |
8a9b8146 TT |
2311 | struct value *value = dwarf_expr_fetch (ctx, 0); |
2312 | gdb_byte *contents; | |
2313 | const gdb_byte *val_bytes; | |
2314 | size_t n = TYPE_LENGTH (value_type (value)); | |
cec03d70 | 2315 | |
8cf6f0b1 TT |
2316 | if (byte_offset + TYPE_LENGTH (type) > n) |
2317 | invalid_synthetic_pointer (); | |
2318 | ||
8a9b8146 TT |
2319 | val_bytes = value_contents_all (value); |
2320 | val_bytes += byte_offset; | |
8cf6f0b1 TT |
2321 | n -= byte_offset; |
2322 | ||
72fc29ff TT |
2323 | /* Preserve VALUE because we are going to free values back |
2324 | to the mark, but we still need the value contents | |
2325 | below. */ | |
2326 | value_incref (value); | |
2327 | do_cleanups (value_chain); | |
2328 | make_cleanup_value_free (value); | |
2329 | ||
a2d33775 | 2330 | retval = allocate_value (type); |
cec03d70 | 2331 | contents = value_contents_raw (retval); |
a2d33775 | 2332 | if (n > TYPE_LENGTH (type)) |
b6cede78 JK |
2333 | { |
2334 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
2335 | ||
2336 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2337 | val_bytes += n - TYPE_LENGTH (type); | |
2338 | n = TYPE_LENGTH (type); | |
2339 | } | |
8a9b8146 | 2340 | memcpy (contents, val_bytes, n); |
cec03d70 TT |
2341 | } |
2342 | break; | |
2343 | ||
2344 | case DWARF_VALUE_LITERAL: | |
2345 | { | |
2346 | bfd_byte *contents; | |
8c814cdd | 2347 | const bfd_byte *ldata; |
cec03d70 TT |
2348 | size_t n = ctx->len; |
2349 | ||
8cf6f0b1 TT |
2350 | if (byte_offset + TYPE_LENGTH (type) > n) |
2351 | invalid_synthetic_pointer (); | |
2352 | ||
72fc29ff | 2353 | do_cleanups (value_chain); |
a2d33775 | 2354 | retval = allocate_value (type); |
cec03d70 | 2355 | contents = value_contents_raw (retval); |
8cf6f0b1 | 2356 | |
8c814cdd | 2357 | ldata = ctx->data + byte_offset; |
8cf6f0b1 TT |
2358 | n -= byte_offset; |
2359 | ||
a2d33775 | 2360 | if (n > TYPE_LENGTH (type)) |
b6cede78 JK |
2361 | { |
2362 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
2363 | ||
2364 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2365 | ldata += n - TYPE_LENGTH (type); | |
2366 | n = TYPE_LENGTH (type); | |
2367 | } | |
8c814cdd | 2368 | memcpy (contents, ldata, n); |
cec03d70 TT |
2369 | } |
2370 | break; | |
2371 | ||
dd90784c | 2372 | case DWARF_VALUE_OPTIMIZED_OUT: |
72fc29ff | 2373 | do_cleanups (value_chain); |
a7035dbb | 2374 | retval = allocate_optimized_out_value (type); |
dd90784c JK |
2375 | break; |
2376 | ||
8cf6f0b1 TT |
2377 | /* DWARF_VALUE_IMPLICIT_POINTER was converted to a pieced |
2378 | operation by execute_stack_op. */ | |
2379 | case DWARF_VALUE_IMPLICIT_POINTER: | |
cb826367 TT |
2380 | /* DWARF_VALUE_OPTIMIZED_OUT can't occur in this context -- |
2381 | it can only be encountered when making a piece. */ | |
cec03d70 TT |
2382 | default: |
2383 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
2384 | } | |
4c2df51b DJ |
2385 | } |
2386 | ||
42be36b3 CT |
2387 | set_value_initialized (retval, ctx->initialized); |
2388 | ||
4a227398 | 2389 | do_cleanups (old_chain); |
4c2df51b DJ |
2390 | |
2391 | return retval; | |
2392 | } | |
8cf6f0b1 TT |
2393 | |
2394 | /* The exported interface to dwarf2_evaluate_loc_desc_full; it always | |
2395 | passes 0 as the byte_offset. */ | |
2396 | ||
2397 | struct value * | |
2398 | dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame, | |
56eb65bd | 2399 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2400 | struct dwarf2_per_cu_data *per_cu) |
2401 | { | |
2402 | return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, 0); | |
2403 | } | |
2404 | ||
4c2df51b DJ |
2405 | \f |
2406 | /* Helper functions and baton for dwarf2_loc_desc_needs_frame. */ | |
2407 | ||
2408 | struct needs_frame_baton | |
2409 | { | |
2410 | int needs_frame; | |
17ea53c3 | 2411 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b DJ |
2412 | }; |
2413 | ||
2414 | /* Reads from registers do require a frame. */ | |
2415 | static CORE_ADDR | |
61fbb938 | 2416 | needs_frame_read_reg (void *baton, int regnum) |
4c2df51b DJ |
2417 | { |
2418 | struct needs_frame_baton *nf_baton = baton; | |
9a619af0 | 2419 | |
4c2df51b DJ |
2420 | nf_baton->needs_frame = 1; |
2421 | return 1; | |
2422 | } | |
2423 | ||
2424 | /* Reads from memory do not require a frame. */ | |
2425 | static void | |
852483bc | 2426 | needs_frame_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
4c2df51b DJ |
2427 | { |
2428 | memset (buf, 0, len); | |
2429 | } | |
2430 | ||
2431 | /* Frame-relative accesses do require a frame. */ | |
2432 | static void | |
0d45f56e | 2433 | needs_frame_frame_base (void *baton, const gdb_byte **start, size_t * length) |
4c2df51b | 2434 | { |
852483bc | 2435 | static gdb_byte lit0 = DW_OP_lit0; |
4c2df51b DJ |
2436 | struct needs_frame_baton *nf_baton = baton; |
2437 | ||
2438 | *start = &lit0; | |
2439 | *length = 1; | |
2440 | ||
2441 | nf_baton->needs_frame = 1; | |
2442 | } | |
2443 | ||
e7802207 TT |
2444 | /* CFA accesses require a frame. */ |
2445 | ||
2446 | static CORE_ADDR | |
2447 | needs_frame_frame_cfa (void *baton) | |
2448 | { | |
2449 | struct needs_frame_baton *nf_baton = baton; | |
9a619af0 | 2450 | |
e7802207 TT |
2451 | nf_baton->needs_frame = 1; |
2452 | return 1; | |
2453 | } | |
2454 | ||
4c2df51b DJ |
2455 | /* Thread-local accesses do require a frame. */ |
2456 | static CORE_ADDR | |
2457 | needs_frame_tls_address (void *baton, CORE_ADDR offset) | |
2458 | { | |
2459 | struct needs_frame_baton *nf_baton = baton; | |
9a619af0 | 2460 | |
4c2df51b DJ |
2461 | nf_baton->needs_frame = 1; |
2462 | return 1; | |
2463 | } | |
2464 | ||
5c631832 JK |
2465 | /* Helper interface of per_cu_dwarf_call for dwarf2_loc_desc_needs_frame. */ |
2466 | ||
2467 | static void | |
b64f50a1 | 2468 | needs_frame_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset) |
5c631832 JK |
2469 | { |
2470 | struct needs_frame_baton *nf_baton = ctx->baton; | |
2471 | ||
37b50a69 | 2472 | per_cu_dwarf_call (ctx, die_offset, nf_baton->per_cu, |
9e8b7a03 | 2473 | ctx->funcs->get_frame_pc, ctx->baton); |
5c631832 JK |
2474 | } |
2475 | ||
8e3b41a9 JK |
2476 | /* DW_OP_GNU_entry_value accesses require a caller, therefore a frame. */ |
2477 | ||
2478 | static void | |
2479 | needs_dwarf_reg_entry_value (struct dwarf_expr_context *ctx, | |
24c5c679 JK |
2480 | enum call_site_parameter_kind kind, |
2481 | union call_site_parameter_u kind_u, int deref_size) | |
8e3b41a9 JK |
2482 | { |
2483 | struct needs_frame_baton *nf_baton = ctx->baton; | |
2484 | ||
2485 | nf_baton->needs_frame = 1; | |
1788b2d3 JK |
2486 | |
2487 | /* The expression may require some stub values on DWARF stack. */ | |
2488 | dwarf_expr_push_address (ctx, 0, 0); | |
8e3b41a9 JK |
2489 | } |
2490 | ||
3019eac3 DE |
2491 | /* DW_OP_GNU_addr_index doesn't require a frame. */ |
2492 | ||
2493 | static CORE_ADDR | |
2494 | needs_get_addr_index (void *baton, unsigned int index) | |
2495 | { | |
2496 | /* Nothing to do. */ | |
2497 | return 1; | |
2498 | } | |
2499 | ||
9e8b7a03 JK |
2500 | /* Virtual method table for dwarf2_loc_desc_needs_frame below. */ |
2501 | ||
2502 | static const struct dwarf_expr_context_funcs needs_frame_ctx_funcs = | |
2503 | { | |
2504 | needs_frame_read_reg, | |
2505 | needs_frame_read_mem, | |
2506 | needs_frame_frame_base, | |
2507 | needs_frame_frame_cfa, | |
2508 | needs_frame_frame_cfa, /* get_frame_pc */ | |
2509 | needs_frame_tls_address, | |
2510 | needs_frame_dwarf_call, | |
8e3b41a9 | 2511 | NULL, /* get_base_type */ |
3019eac3 DE |
2512 | needs_dwarf_reg_entry_value, |
2513 | needs_get_addr_index | |
9e8b7a03 JK |
2514 | }; |
2515 | ||
4c2df51b DJ |
2516 | /* Return non-zero iff the location expression at DATA (length SIZE) |
2517 | requires a frame to evaluate. */ | |
2518 | ||
2519 | static int | |
56eb65bd | 2520 | dwarf2_loc_desc_needs_frame (const gdb_byte *data, size_t size, |
ae0d2f24 | 2521 | struct dwarf2_per_cu_data *per_cu) |
4c2df51b DJ |
2522 | { |
2523 | struct needs_frame_baton baton; | |
2524 | struct dwarf_expr_context *ctx; | |
f630a401 | 2525 | int in_reg; |
4a227398 | 2526 | struct cleanup *old_chain; |
ac56253d | 2527 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b DJ |
2528 | |
2529 | baton.needs_frame = 0; | |
17ea53c3 | 2530 | baton.per_cu = per_cu; |
4c2df51b DJ |
2531 | |
2532 | ctx = new_dwarf_expr_context (); | |
4a227398 | 2533 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 2534 | make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 2535 | |
ac56253d | 2536 | ctx->gdbarch = get_objfile_arch (objfile); |
ae0d2f24 | 2537 | ctx->addr_size = dwarf2_per_cu_addr_size (per_cu); |
181cebd4 | 2538 | ctx->ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); |
9aa1f1e3 | 2539 | ctx->offset = dwarf2_per_cu_text_offset (per_cu); |
4c2df51b | 2540 | ctx->baton = &baton; |
9e8b7a03 | 2541 | ctx->funcs = &needs_frame_ctx_funcs; |
4c2df51b DJ |
2542 | |
2543 | dwarf_expr_eval (ctx, data, size); | |
2544 | ||
cec03d70 | 2545 | in_reg = ctx->location == DWARF_VALUE_REGISTER; |
f630a401 | 2546 | |
87808bd6 JB |
2547 | if (ctx->num_pieces > 0) |
2548 | { | |
2549 | int i; | |
2550 | ||
2551 | /* If the location has several pieces, and any of them are in | |
2552 | registers, then we will need a frame to fetch them from. */ | |
2553 | for (i = 0; i < ctx->num_pieces; i++) | |
cec03d70 | 2554 | if (ctx->pieces[i].location == DWARF_VALUE_REGISTER) |
87808bd6 JB |
2555 | in_reg = 1; |
2556 | } | |
2557 | ||
4a227398 | 2558 | do_cleanups (old_chain); |
4c2df51b | 2559 | |
f630a401 | 2560 | return baton.needs_frame || in_reg; |
4c2df51b DJ |
2561 | } |
2562 | ||
3cf03773 TT |
2563 | /* A helper function that throws an unimplemented error mentioning a |
2564 | given DWARF operator. */ | |
2565 | ||
2566 | static void | |
2567 | unimplemented (unsigned int op) | |
0d53c4c4 | 2568 | { |
f39c6ffd | 2569 | const char *name = get_DW_OP_name (op); |
b1bfef65 TT |
2570 | |
2571 | if (name) | |
2572 | error (_("DWARF operator %s cannot be translated to an agent expression"), | |
2573 | name); | |
2574 | else | |
1ba1b353 TT |
2575 | error (_("Unknown DWARF operator 0x%02x cannot be translated " |
2576 | "to an agent expression"), | |
b1bfef65 | 2577 | op); |
3cf03773 | 2578 | } |
08922a10 | 2579 | |
3cf03773 TT |
2580 | /* A helper function to convert a DWARF register to an arch register. |
2581 | ARCH is the architecture. | |
2582 | DWARF_REG is the register. | |
2583 | This will throw an exception if the DWARF register cannot be | |
2584 | translated to an architecture register. */ | |
08922a10 | 2585 | |
3cf03773 TT |
2586 | static int |
2587 | translate_register (struct gdbarch *arch, int dwarf_reg) | |
2588 | { | |
2589 | int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg); | |
2590 | if (reg == -1) | |
2591 | error (_("Unable to access DWARF register number %d"), dwarf_reg); | |
2592 | return reg; | |
2593 | } | |
08922a10 | 2594 | |
3cf03773 TT |
2595 | /* A helper function that emits an access to memory. ARCH is the |
2596 | target architecture. EXPR is the expression which we are building. | |
2597 | NBITS is the number of bits we want to read. This emits the | |
2598 | opcodes needed to read the memory and then extract the desired | |
2599 | bits. */ | |
08922a10 | 2600 | |
3cf03773 TT |
2601 | static void |
2602 | access_memory (struct gdbarch *arch, struct agent_expr *expr, ULONGEST nbits) | |
08922a10 | 2603 | { |
3cf03773 TT |
2604 | ULONGEST nbytes = (nbits + 7) / 8; |
2605 | ||
9df7235c | 2606 | gdb_assert (nbytes > 0 && nbytes <= sizeof (LONGEST)); |
3cf03773 | 2607 | |
92bc6a20 | 2608 | if (expr->tracing) |
3cf03773 TT |
2609 | ax_trace_quick (expr, nbytes); |
2610 | ||
2611 | if (nbits <= 8) | |
2612 | ax_simple (expr, aop_ref8); | |
2613 | else if (nbits <= 16) | |
2614 | ax_simple (expr, aop_ref16); | |
2615 | else if (nbits <= 32) | |
2616 | ax_simple (expr, aop_ref32); | |
2617 | else | |
2618 | ax_simple (expr, aop_ref64); | |
2619 | ||
2620 | /* If we read exactly the number of bytes we wanted, we're done. */ | |
2621 | if (8 * nbytes == nbits) | |
2622 | return; | |
2623 | ||
2624 | if (gdbarch_bits_big_endian (arch)) | |
0d53c4c4 | 2625 | { |
3cf03773 TT |
2626 | /* On a bits-big-endian machine, we want the high-order |
2627 | NBITS. */ | |
2628 | ax_const_l (expr, 8 * nbytes - nbits); | |
2629 | ax_simple (expr, aop_rsh_unsigned); | |
0d53c4c4 | 2630 | } |
3cf03773 | 2631 | else |
0d53c4c4 | 2632 | { |
3cf03773 TT |
2633 | /* On a bits-little-endian box, we want the low-order NBITS. */ |
2634 | ax_zero_ext (expr, nbits); | |
0d53c4c4 | 2635 | } |
3cf03773 | 2636 | } |
0936ad1d | 2637 | |
8cf6f0b1 TT |
2638 | /* A helper function to return the frame's PC. */ |
2639 | ||
2640 | static CORE_ADDR | |
2641 | get_ax_pc (void *baton) | |
2642 | { | |
2643 | struct agent_expr *expr = baton; | |
2644 | ||
2645 | return expr->scope; | |
2646 | } | |
2647 | ||
3cf03773 TT |
2648 | /* Compile a DWARF location expression to an agent expression. |
2649 | ||
2650 | EXPR is the agent expression we are building. | |
2651 | LOC is the agent value we modify. | |
2652 | ARCH is the architecture. | |
2653 | ADDR_SIZE is the size of addresses, in bytes. | |
2654 | OP_PTR is the start of the location expression. | |
2655 | OP_END is one past the last byte of the location expression. | |
2656 | ||
2657 | This will throw an exception for various kinds of errors -- for | |
2658 | example, if the expression cannot be compiled, or if the expression | |
2659 | is invalid. */ | |
0936ad1d | 2660 | |
9f6f94ff TT |
2661 | void |
2662 | dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
2663 | struct gdbarch *arch, unsigned int addr_size, | |
2664 | const gdb_byte *op_ptr, const gdb_byte *op_end, | |
2665 | struct dwarf2_per_cu_data *per_cu) | |
3cf03773 TT |
2666 | { |
2667 | struct cleanup *cleanups; | |
2668 | int i, *offsets; | |
2669 | VEC(int) *dw_labels = NULL, *patches = NULL; | |
2670 | const gdb_byte * const base = op_ptr; | |
2671 | const gdb_byte *previous_piece = op_ptr; | |
2672 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
2673 | ULONGEST bits_collected = 0; | |
2674 | unsigned int addr_size_bits = 8 * addr_size; | |
2675 | int bits_big_endian = gdbarch_bits_big_endian (arch); | |
0936ad1d | 2676 | |
3cf03773 TT |
2677 | offsets = xmalloc ((op_end - op_ptr) * sizeof (int)); |
2678 | cleanups = make_cleanup (xfree, offsets); | |
0936ad1d | 2679 | |
3cf03773 TT |
2680 | for (i = 0; i < op_end - op_ptr; ++i) |
2681 | offsets[i] = -1; | |
0936ad1d | 2682 | |
3cf03773 TT |
2683 | make_cleanup (VEC_cleanup (int), &dw_labels); |
2684 | make_cleanup (VEC_cleanup (int), &patches); | |
0936ad1d | 2685 | |
3cf03773 TT |
2686 | /* By default we are making an address. */ |
2687 | loc->kind = axs_lvalue_memory; | |
0d45f56e | 2688 | |
3cf03773 TT |
2689 | while (op_ptr < op_end) |
2690 | { | |
2691 | enum dwarf_location_atom op = *op_ptr; | |
9fccedf7 DE |
2692 | uint64_t uoffset, reg; |
2693 | int64_t offset; | |
3cf03773 TT |
2694 | int i; |
2695 | ||
2696 | offsets[op_ptr - base] = expr->len; | |
2697 | ++op_ptr; | |
2698 | ||
2699 | /* Our basic approach to code generation is to map DWARF | |
2700 | operations directly to AX operations. However, there are | |
2701 | some differences. | |
2702 | ||
2703 | First, DWARF works on address-sized units, but AX always uses | |
2704 | LONGEST. For most operations we simply ignore this | |
2705 | difference; instead we generate sign extensions as needed | |
2706 | before division and comparison operations. It would be nice | |
2707 | to omit the sign extensions, but there is no way to determine | |
2708 | the size of the target's LONGEST. (This code uses the size | |
2709 | of the host LONGEST in some cases -- that is a bug but it is | |
2710 | difficult to fix.) | |
2711 | ||
2712 | Second, some DWARF operations cannot be translated to AX. | |
2713 | For these we simply fail. See | |
2714 | http://sourceware.org/bugzilla/show_bug.cgi?id=11662. */ | |
2715 | switch (op) | |
0936ad1d | 2716 | { |
3cf03773 TT |
2717 | case DW_OP_lit0: |
2718 | case DW_OP_lit1: | |
2719 | case DW_OP_lit2: | |
2720 | case DW_OP_lit3: | |
2721 | case DW_OP_lit4: | |
2722 | case DW_OP_lit5: | |
2723 | case DW_OP_lit6: | |
2724 | case DW_OP_lit7: | |
2725 | case DW_OP_lit8: | |
2726 | case DW_OP_lit9: | |
2727 | case DW_OP_lit10: | |
2728 | case DW_OP_lit11: | |
2729 | case DW_OP_lit12: | |
2730 | case DW_OP_lit13: | |
2731 | case DW_OP_lit14: | |
2732 | case DW_OP_lit15: | |
2733 | case DW_OP_lit16: | |
2734 | case DW_OP_lit17: | |
2735 | case DW_OP_lit18: | |
2736 | case DW_OP_lit19: | |
2737 | case DW_OP_lit20: | |
2738 | case DW_OP_lit21: | |
2739 | case DW_OP_lit22: | |
2740 | case DW_OP_lit23: | |
2741 | case DW_OP_lit24: | |
2742 | case DW_OP_lit25: | |
2743 | case DW_OP_lit26: | |
2744 | case DW_OP_lit27: | |
2745 | case DW_OP_lit28: | |
2746 | case DW_OP_lit29: | |
2747 | case DW_OP_lit30: | |
2748 | case DW_OP_lit31: | |
2749 | ax_const_l (expr, op - DW_OP_lit0); | |
2750 | break; | |
0d53c4c4 | 2751 | |
3cf03773 | 2752 | case DW_OP_addr: |
ac56253d | 2753 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
3cf03773 | 2754 | op_ptr += addr_size; |
ac56253d TT |
2755 | /* Some versions of GCC emit DW_OP_addr before |
2756 | DW_OP_GNU_push_tls_address. In this case the value is an | |
2757 | index, not an address. We don't support things like | |
2758 | branching between the address and the TLS op. */ | |
2759 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
9aa1f1e3 | 2760 | uoffset += dwarf2_per_cu_text_offset (per_cu); |
ac56253d | 2761 | ax_const_l (expr, uoffset); |
3cf03773 | 2762 | break; |
4c2df51b | 2763 | |
3cf03773 TT |
2764 | case DW_OP_const1u: |
2765 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 1, byte_order)); | |
2766 | op_ptr += 1; | |
2767 | break; | |
2768 | case DW_OP_const1s: | |
2769 | ax_const_l (expr, extract_signed_integer (op_ptr, 1, byte_order)); | |
2770 | op_ptr += 1; | |
2771 | break; | |
2772 | case DW_OP_const2u: | |
2773 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 2, byte_order)); | |
2774 | op_ptr += 2; | |
2775 | break; | |
2776 | case DW_OP_const2s: | |
2777 | ax_const_l (expr, extract_signed_integer (op_ptr, 2, byte_order)); | |
2778 | op_ptr += 2; | |
2779 | break; | |
2780 | case DW_OP_const4u: | |
2781 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 4, byte_order)); | |
2782 | op_ptr += 4; | |
2783 | break; | |
2784 | case DW_OP_const4s: | |
2785 | ax_const_l (expr, extract_signed_integer (op_ptr, 4, byte_order)); | |
2786 | op_ptr += 4; | |
2787 | break; | |
2788 | case DW_OP_const8u: | |
2789 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 8, byte_order)); | |
2790 | op_ptr += 8; | |
2791 | break; | |
2792 | case DW_OP_const8s: | |
2793 | ax_const_l (expr, extract_signed_integer (op_ptr, 8, byte_order)); | |
2794 | op_ptr += 8; | |
2795 | break; | |
2796 | case DW_OP_constu: | |
f664829e | 2797 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
3cf03773 TT |
2798 | ax_const_l (expr, uoffset); |
2799 | break; | |
2800 | case DW_OP_consts: | |
f664829e | 2801 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
3cf03773 TT |
2802 | ax_const_l (expr, offset); |
2803 | break; | |
9c238357 | 2804 | |
3cf03773 TT |
2805 | case DW_OP_reg0: |
2806 | case DW_OP_reg1: | |
2807 | case DW_OP_reg2: | |
2808 | case DW_OP_reg3: | |
2809 | case DW_OP_reg4: | |
2810 | case DW_OP_reg5: | |
2811 | case DW_OP_reg6: | |
2812 | case DW_OP_reg7: | |
2813 | case DW_OP_reg8: | |
2814 | case DW_OP_reg9: | |
2815 | case DW_OP_reg10: | |
2816 | case DW_OP_reg11: | |
2817 | case DW_OP_reg12: | |
2818 | case DW_OP_reg13: | |
2819 | case DW_OP_reg14: | |
2820 | case DW_OP_reg15: | |
2821 | case DW_OP_reg16: | |
2822 | case DW_OP_reg17: | |
2823 | case DW_OP_reg18: | |
2824 | case DW_OP_reg19: | |
2825 | case DW_OP_reg20: | |
2826 | case DW_OP_reg21: | |
2827 | case DW_OP_reg22: | |
2828 | case DW_OP_reg23: | |
2829 | case DW_OP_reg24: | |
2830 | case DW_OP_reg25: | |
2831 | case DW_OP_reg26: | |
2832 | case DW_OP_reg27: | |
2833 | case DW_OP_reg28: | |
2834 | case DW_OP_reg29: | |
2835 | case DW_OP_reg30: | |
2836 | case DW_OP_reg31: | |
2837 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
2838 | loc->u.reg = translate_register (arch, op - DW_OP_reg0); | |
2839 | loc->kind = axs_lvalue_register; | |
2840 | break; | |
9c238357 | 2841 | |
3cf03773 | 2842 | case DW_OP_regx: |
f664829e | 2843 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 TT |
2844 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); |
2845 | loc->u.reg = translate_register (arch, reg); | |
2846 | loc->kind = axs_lvalue_register; | |
2847 | break; | |
08922a10 | 2848 | |
3cf03773 TT |
2849 | case DW_OP_implicit_value: |
2850 | { | |
9fccedf7 | 2851 | uint64_t len; |
3cf03773 | 2852 | |
f664829e | 2853 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &len); |
3cf03773 TT |
2854 | if (op_ptr + len > op_end) |
2855 | error (_("DW_OP_implicit_value: too few bytes available.")); | |
2856 | if (len > sizeof (ULONGEST)) | |
2857 | error (_("Cannot translate DW_OP_implicit_value of %d bytes"), | |
2858 | (int) len); | |
2859 | ||
2860 | ax_const_l (expr, extract_unsigned_integer (op_ptr, len, | |
2861 | byte_order)); | |
2862 | op_ptr += len; | |
2863 | dwarf_expr_require_composition (op_ptr, op_end, | |
2864 | "DW_OP_implicit_value"); | |
2865 | ||
2866 | loc->kind = axs_rvalue; | |
2867 | } | |
2868 | break; | |
08922a10 | 2869 | |
3cf03773 TT |
2870 | case DW_OP_stack_value: |
2871 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value"); | |
2872 | loc->kind = axs_rvalue; | |
2873 | break; | |
08922a10 | 2874 | |
3cf03773 TT |
2875 | case DW_OP_breg0: |
2876 | case DW_OP_breg1: | |
2877 | case DW_OP_breg2: | |
2878 | case DW_OP_breg3: | |
2879 | case DW_OP_breg4: | |
2880 | case DW_OP_breg5: | |
2881 | case DW_OP_breg6: | |
2882 | case DW_OP_breg7: | |
2883 | case DW_OP_breg8: | |
2884 | case DW_OP_breg9: | |
2885 | case DW_OP_breg10: | |
2886 | case DW_OP_breg11: | |
2887 | case DW_OP_breg12: | |
2888 | case DW_OP_breg13: | |
2889 | case DW_OP_breg14: | |
2890 | case DW_OP_breg15: | |
2891 | case DW_OP_breg16: | |
2892 | case DW_OP_breg17: | |
2893 | case DW_OP_breg18: | |
2894 | case DW_OP_breg19: | |
2895 | case DW_OP_breg20: | |
2896 | case DW_OP_breg21: | |
2897 | case DW_OP_breg22: | |
2898 | case DW_OP_breg23: | |
2899 | case DW_OP_breg24: | |
2900 | case DW_OP_breg25: | |
2901 | case DW_OP_breg26: | |
2902 | case DW_OP_breg27: | |
2903 | case DW_OP_breg28: | |
2904 | case DW_OP_breg29: | |
2905 | case DW_OP_breg30: | |
2906 | case DW_OP_breg31: | |
f664829e | 2907 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
3cf03773 TT |
2908 | i = translate_register (arch, op - DW_OP_breg0); |
2909 | ax_reg (expr, i); | |
2910 | if (offset != 0) | |
2911 | { | |
2912 | ax_const_l (expr, offset); | |
2913 | ax_simple (expr, aop_add); | |
2914 | } | |
2915 | break; | |
2916 | case DW_OP_bregx: | |
2917 | { | |
f664829e DE |
2918 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
2919 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
3cf03773 TT |
2920 | i = translate_register (arch, reg); |
2921 | ax_reg (expr, i); | |
2922 | if (offset != 0) | |
2923 | { | |
2924 | ax_const_l (expr, offset); | |
2925 | ax_simple (expr, aop_add); | |
2926 | } | |
2927 | } | |
2928 | break; | |
2929 | case DW_OP_fbreg: | |
2930 | { | |
2931 | const gdb_byte *datastart; | |
2932 | size_t datalen; | |
3cf03773 TT |
2933 | struct block *b; |
2934 | struct symbol *framefunc; | |
08922a10 | 2935 | |
3cf03773 TT |
2936 | b = block_for_pc (expr->scope); |
2937 | ||
2938 | if (!b) | |
2939 | error (_("No block found for address")); | |
2940 | ||
2941 | framefunc = block_linkage_function (b); | |
2942 | ||
2943 | if (!framefunc) | |
2944 | error (_("No function found for block")); | |
2945 | ||
2946 | dwarf_expr_frame_base_1 (framefunc, expr->scope, | |
2947 | &datastart, &datalen); | |
2948 | ||
f664829e | 2949 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
9f6f94ff TT |
2950 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, datastart, |
2951 | datastart + datalen, per_cu); | |
d84cf7eb TT |
2952 | if (loc->kind == axs_lvalue_register) |
2953 | require_rvalue (expr, loc); | |
3cf03773 TT |
2954 | |
2955 | if (offset != 0) | |
2956 | { | |
2957 | ax_const_l (expr, offset); | |
2958 | ax_simple (expr, aop_add); | |
2959 | } | |
2960 | ||
2961 | loc->kind = axs_lvalue_memory; | |
2962 | } | |
08922a10 | 2963 | break; |
08922a10 | 2964 | |
3cf03773 TT |
2965 | case DW_OP_dup: |
2966 | ax_simple (expr, aop_dup); | |
2967 | break; | |
08922a10 | 2968 | |
3cf03773 TT |
2969 | case DW_OP_drop: |
2970 | ax_simple (expr, aop_pop); | |
2971 | break; | |
08922a10 | 2972 | |
3cf03773 TT |
2973 | case DW_OP_pick: |
2974 | offset = *op_ptr++; | |
c7f96d2b | 2975 | ax_pick (expr, offset); |
3cf03773 TT |
2976 | break; |
2977 | ||
2978 | case DW_OP_swap: | |
2979 | ax_simple (expr, aop_swap); | |
2980 | break; | |
08922a10 | 2981 | |
3cf03773 | 2982 | case DW_OP_over: |
c7f96d2b | 2983 | ax_pick (expr, 1); |
3cf03773 | 2984 | break; |
08922a10 | 2985 | |
3cf03773 | 2986 | case DW_OP_rot: |
c7f96d2b | 2987 | ax_simple (expr, aop_rot); |
3cf03773 | 2988 | break; |
08922a10 | 2989 | |
3cf03773 TT |
2990 | case DW_OP_deref: |
2991 | case DW_OP_deref_size: | |
2992 | { | |
2993 | int size; | |
08922a10 | 2994 | |
3cf03773 TT |
2995 | if (op == DW_OP_deref_size) |
2996 | size = *op_ptr++; | |
2997 | else | |
2998 | size = addr_size; | |
2999 | ||
9df7235c | 3000 | if (size != 1 && size != 2 && size != 4 && size != 8) |
f3cec7e6 HZ |
3001 | error (_("Unsupported size %d in %s"), |
3002 | size, get_DW_OP_name (op)); | |
9df7235c | 3003 | access_memory (arch, expr, size * TARGET_CHAR_BIT); |
3cf03773 TT |
3004 | } |
3005 | break; | |
3006 | ||
3007 | case DW_OP_abs: | |
3008 | /* Sign extend the operand. */ | |
3009 | ax_ext (expr, addr_size_bits); | |
3010 | ax_simple (expr, aop_dup); | |
3011 | ax_const_l (expr, 0); | |
3012 | ax_simple (expr, aop_less_signed); | |
3013 | ax_simple (expr, aop_log_not); | |
3014 | i = ax_goto (expr, aop_if_goto); | |
3015 | /* We have to emit 0 - X. */ | |
3016 | ax_const_l (expr, 0); | |
3017 | ax_simple (expr, aop_swap); | |
3018 | ax_simple (expr, aop_sub); | |
3019 | ax_label (expr, i, expr->len); | |
3020 | break; | |
3021 | ||
3022 | case DW_OP_neg: | |
3023 | /* No need to sign extend here. */ | |
3024 | ax_const_l (expr, 0); | |
3025 | ax_simple (expr, aop_swap); | |
3026 | ax_simple (expr, aop_sub); | |
3027 | break; | |
3028 | ||
3029 | case DW_OP_not: | |
3030 | /* Sign extend the operand. */ | |
3031 | ax_ext (expr, addr_size_bits); | |
3032 | ax_simple (expr, aop_bit_not); | |
3033 | break; | |
3034 | ||
3035 | case DW_OP_plus_uconst: | |
f664829e | 3036 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 TT |
3037 | /* It would be really weird to emit `DW_OP_plus_uconst 0', |
3038 | but we micro-optimize anyhow. */ | |
3039 | if (reg != 0) | |
3040 | { | |
3041 | ax_const_l (expr, reg); | |
3042 | ax_simple (expr, aop_add); | |
3043 | } | |
3044 | break; | |
3045 | ||
3046 | case DW_OP_and: | |
3047 | ax_simple (expr, aop_bit_and); | |
3048 | break; | |
3049 | ||
3050 | case DW_OP_div: | |
3051 | /* Sign extend the operands. */ | |
3052 | ax_ext (expr, addr_size_bits); | |
3053 | ax_simple (expr, aop_swap); | |
3054 | ax_ext (expr, addr_size_bits); | |
3055 | ax_simple (expr, aop_swap); | |
3056 | ax_simple (expr, aop_div_signed); | |
08922a10 SS |
3057 | break; |
3058 | ||
3cf03773 TT |
3059 | case DW_OP_minus: |
3060 | ax_simple (expr, aop_sub); | |
3061 | break; | |
3062 | ||
3063 | case DW_OP_mod: | |
3064 | ax_simple (expr, aop_rem_unsigned); | |
3065 | break; | |
3066 | ||
3067 | case DW_OP_mul: | |
3068 | ax_simple (expr, aop_mul); | |
3069 | break; | |
3070 | ||
3071 | case DW_OP_or: | |
3072 | ax_simple (expr, aop_bit_or); | |
3073 | break; | |
3074 | ||
3075 | case DW_OP_plus: | |
3076 | ax_simple (expr, aop_add); | |
3077 | break; | |
3078 | ||
3079 | case DW_OP_shl: | |
3080 | ax_simple (expr, aop_lsh); | |
3081 | break; | |
3082 | ||
3083 | case DW_OP_shr: | |
3084 | ax_simple (expr, aop_rsh_unsigned); | |
3085 | break; | |
3086 | ||
3087 | case DW_OP_shra: | |
3088 | ax_simple (expr, aop_rsh_signed); | |
3089 | break; | |
3090 | ||
3091 | case DW_OP_xor: | |
3092 | ax_simple (expr, aop_bit_xor); | |
3093 | break; | |
3094 | ||
3095 | case DW_OP_le: | |
3096 | /* Sign extend the operands. */ | |
3097 | ax_ext (expr, addr_size_bits); | |
3098 | ax_simple (expr, aop_swap); | |
3099 | ax_ext (expr, addr_size_bits); | |
3100 | /* Note no swap here: A <= B is !(B < A). */ | |
3101 | ax_simple (expr, aop_less_signed); | |
3102 | ax_simple (expr, aop_log_not); | |
3103 | break; | |
3104 | ||
3105 | case DW_OP_ge: | |
3106 | /* Sign extend the operands. */ | |
3107 | ax_ext (expr, addr_size_bits); | |
3108 | ax_simple (expr, aop_swap); | |
3109 | ax_ext (expr, addr_size_bits); | |
3110 | ax_simple (expr, aop_swap); | |
3111 | /* A >= B is !(A < B). */ | |
3112 | ax_simple (expr, aop_less_signed); | |
3113 | ax_simple (expr, aop_log_not); | |
3114 | break; | |
3115 | ||
3116 | case DW_OP_eq: | |
3117 | /* Sign extend the operands. */ | |
3118 | ax_ext (expr, addr_size_bits); | |
3119 | ax_simple (expr, aop_swap); | |
3120 | ax_ext (expr, addr_size_bits); | |
3121 | /* No need for a second swap here. */ | |
3122 | ax_simple (expr, aop_equal); | |
3123 | break; | |
3124 | ||
3125 | case DW_OP_lt: | |
3126 | /* Sign extend the operands. */ | |
3127 | ax_ext (expr, addr_size_bits); | |
3128 | ax_simple (expr, aop_swap); | |
3129 | ax_ext (expr, addr_size_bits); | |
3130 | ax_simple (expr, aop_swap); | |
3131 | ax_simple (expr, aop_less_signed); | |
3132 | break; | |
3133 | ||
3134 | case DW_OP_gt: | |
3135 | /* Sign extend the operands. */ | |
3136 | ax_ext (expr, addr_size_bits); | |
3137 | ax_simple (expr, aop_swap); | |
3138 | ax_ext (expr, addr_size_bits); | |
3139 | /* Note no swap here: A > B is B < A. */ | |
3140 | ax_simple (expr, aop_less_signed); | |
3141 | break; | |
3142 | ||
3143 | case DW_OP_ne: | |
3144 | /* Sign extend the operands. */ | |
3145 | ax_ext (expr, addr_size_bits); | |
3146 | ax_simple (expr, aop_swap); | |
3147 | ax_ext (expr, addr_size_bits); | |
3148 | /* No need for a swap here. */ | |
3149 | ax_simple (expr, aop_equal); | |
3150 | ax_simple (expr, aop_log_not); | |
3151 | break; | |
3152 | ||
3153 | case DW_OP_call_frame_cfa: | |
9f6f94ff TT |
3154 | dwarf2_compile_cfa_to_ax (expr, loc, arch, expr->scope, per_cu); |
3155 | loc->kind = axs_lvalue_memory; | |
3cf03773 TT |
3156 | break; |
3157 | ||
3158 | case DW_OP_GNU_push_tls_address: | |
3159 | unimplemented (op); | |
3160 | break; | |
3161 | ||
3162 | case DW_OP_skip: | |
3163 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3164 | op_ptr += 2; | |
3165 | i = ax_goto (expr, aop_goto); | |
3166 | VEC_safe_push (int, dw_labels, op_ptr + offset - base); | |
3167 | VEC_safe_push (int, patches, i); | |
3168 | break; | |
3169 | ||
3170 | case DW_OP_bra: | |
3171 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3172 | op_ptr += 2; | |
3173 | /* Zero extend the operand. */ | |
3174 | ax_zero_ext (expr, addr_size_bits); | |
3175 | i = ax_goto (expr, aop_if_goto); | |
3176 | VEC_safe_push (int, dw_labels, op_ptr + offset - base); | |
3177 | VEC_safe_push (int, patches, i); | |
3178 | break; | |
3179 | ||
3180 | case DW_OP_nop: | |
3181 | break; | |
3182 | ||
3183 | case DW_OP_piece: | |
3184 | case DW_OP_bit_piece: | |
08922a10 | 3185 | { |
9fccedf7 | 3186 | uint64_t size, offset; |
3cf03773 TT |
3187 | |
3188 | if (op_ptr - 1 == previous_piece) | |
3189 | error (_("Cannot translate empty pieces to agent expressions")); | |
3190 | previous_piece = op_ptr - 1; | |
3191 | ||
f664829e | 3192 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &size); |
3cf03773 TT |
3193 | if (op == DW_OP_piece) |
3194 | { | |
3195 | size *= 8; | |
3196 | offset = 0; | |
3197 | } | |
3198 | else | |
f664829e | 3199 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &offset); |
08922a10 | 3200 | |
3cf03773 TT |
3201 | if (bits_collected + size > 8 * sizeof (LONGEST)) |
3202 | error (_("Expression pieces exceed word size")); | |
3203 | ||
3204 | /* Access the bits. */ | |
3205 | switch (loc->kind) | |
3206 | { | |
3207 | case axs_lvalue_register: | |
3208 | ax_reg (expr, loc->u.reg); | |
3209 | break; | |
3210 | ||
3211 | case axs_lvalue_memory: | |
3212 | /* Offset the pointer, if needed. */ | |
3213 | if (offset > 8) | |
3214 | { | |
3215 | ax_const_l (expr, offset / 8); | |
3216 | ax_simple (expr, aop_add); | |
3217 | offset %= 8; | |
3218 | } | |
3219 | access_memory (arch, expr, size); | |
3220 | break; | |
3221 | } | |
3222 | ||
3223 | /* For a bits-big-endian target, shift up what we already | |
3224 | have. For a bits-little-endian target, shift up the | |
3225 | new data. Note that there is a potential bug here if | |
3226 | the DWARF expression leaves multiple values on the | |
3227 | stack. */ | |
3228 | if (bits_collected > 0) | |
3229 | { | |
3230 | if (bits_big_endian) | |
3231 | { | |
3232 | ax_simple (expr, aop_swap); | |
3233 | ax_const_l (expr, size); | |
3234 | ax_simple (expr, aop_lsh); | |
3235 | /* We don't need a second swap here, because | |
3236 | aop_bit_or is symmetric. */ | |
3237 | } | |
3238 | else | |
3239 | { | |
3240 | ax_const_l (expr, size); | |
3241 | ax_simple (expr, aop_lsh); | |
3242 | } | |
3243 | ax_simple (expr, aop_bit_or); | |
3244 | } | |
3245 | ||
3246 | bits_collected += size; | |
3247 | loc->kind = axs_rvalue; | |
08922a10 SS |
3248 | } |
3249 | break; | |
08922a10 | 3250 | |
3cf03773 TT |
3251 | case DW_OP_GNU_uninit: |
3252 | unimplemented (op); | |
3253 | ||
3254 | case DW_OP_call2: | |
3255 | case DW_OP_call4: | |
3256 | { | |
3257 | struct dwarf2_locexpr_baton block; | |
3258 | int size = (op == DW_OP_call2 ? 2 : 4); | |
b64f50a1 | 3259 | cu_offset offset; |
3cf03773 TT |
3260 | |
3261 | uoffset = extract_unsigned_integer (op_ptr, size, byte_order); | |
3262 | op_ptr += size; | |
3263 | ||
b64f50a1 | 3264 | offset.cu_off = uoffset; |
8b9737bf TT |
3265 | block = dwarf2_fetch_die_loc_cu_off (offset, per_cu, |
3266 | get_ax_pc, expr); | |
3cf03773 TT |
3267 | |
3268 | /* DW_OP_call_ref is currently not supported. */ | |
3269 | gdb_assert (block.per_cu == per_cu); | |
3270 | ||
9f6f94ff TT |
3271 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, |
3272 | block.data, block.data + block.size, | |
3273 | per_cu); | |
3cf03773 TT |
3274 | } |
3275 | break; | |
3276 | ||
3277 | case DW_OP_call_ref: | |
3278 | unimplemented (op); | |
3279 | ||
3280 | default: | |
b1bfef65 | 3281 | unimplemented (op); |
08922a10 | 3282 | } |
08922a10 | 3283 | } |
3cf03773 TT |
3284 | |
3285 | /* Patch all the branches we emitted. */ | |
3286 | for (i = 0; i < VEC_length (int, patches); ++i) | |
3287 | { | |
3288 | int targ = offsets[VEC_index (int, dw_labels, i)]; | |
3289 | if (targ == -1) | |
3290 | internal_error (__FILE__, __LINE__, _("invalid label")); | |
3291 | ax_label (expr, VEC_index (int, patches, i), targ); | |
3292 | } | |
3293 | ||
3294 | do_cleanups (cleanups); | |
08922a10 SS |
3295 | } |
3296 | ||
4c2df51b DJ |
3297 | \f |
3298 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
3299 | evaluator to calculate the location. */ | |
3300 | static struct value * | |
3301 | locexpr_read_variable (struct symbol *symbol, struct frame_info *frame) | |
3302 | { | |
3303 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
3304 | struct value *val; | |
9a619af0 | 3305 | |
a2d33775 JK |
3306 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data, |
3307 | dlbaton->size, dlbaton->per_cu); | |
4c2df51b DJ |
3308 | |
3309 | return val; | |
3310 | } | |
3311 | ||
e18b2753 JK |
3312 | /* Return the value of SYMBOL in FRAME at (callee) FRAME's function |
3313 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
3314 | will be thrown. */ | |
3315 | ||
3316 | static struct value * | |
3317 | locexpr_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
3318 | { | |
3319 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
3320 | ||
3321 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, dlbaton->data, | |
3322 | dlbaton->size); | |
3323 | } | |
3324 | ||
4c2df51b DJ |
3325 | /* Return non-zero iff we need a frame to evaluate SYMBOL. */ |
3326 | static int | |
3327 | locexpr_read_needs_frame (struct symbol *symbol) | |
3328 | { | |
3329 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
9a619af0 | 3330 | |
ae0d2f24 UW |
3331 | return dwarf2_loc_desc_needs_frame (dlbaton->data, dlbaton->size, |
3332 | dlbaton->per_cu); | |
4c2df51b DJ |
3333 | } |
3334 | ||
9eae7c52 TT |
3335 | /* Return true if DATA points to the end of a piece. END is one past |
3336 | the last byte in the expression. */ | |
3337 | ||
3338 | static int | |
3339 | piece_end_p (const gdb_byte *data, const gdb_byte *end) | |
3340 | { | |
3341 | return data == end || data[0] == DW_OP_piece || data[0] == DW_OP_bit_piece; | |
3342 | } | |
3343 | ||
5e44ecb3 TT |
3344 | /* Helper for locexpr_describe_location_piece that finds the name of a |
3345 | DWARF register. */ | |
3346 | ||
3347 | static const char * | |
3348 | locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum) | |
3349 | { | |
3350 | int regnum; | |
3351 | ||
3352 | regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_regnum); | |
3353 | return gdbarch_register_name (gdbarch, regnum); | |
3354 | } | |
3355 | ||
9eae7c52 TT |
3356 | /* Nicely describe a single piece of a location, returning an updated |
3357 | position in the bytecode sequence. This function cannot recognize | |
3358 | all locations; if a location is not recognized, it simply returns | |
f664829e DE |
3359 | DATA. If there is an error during reading, e.g. we run off the end |
3360 | of the buffer, an error is thrown. */ | |
08922a10 | 3361 | |
0d45f56e | 3362 | static const gdb_byte * |
08922a10 SS |
3363 | locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream, |
3364 | CORE_ADDR addr, struct objfile *objfile, | |
49f6c839 | 3365 | struct dwarf2_per_cu_data *per_cu, |
9eae7c52 | 3366 | const gdb_byte *data, const gdb_byte *end, |
0d45f56e | 3367 | unsigned int addr_size) |
4c2df51b | 3368 | { |
08922a10 | 3369 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
49f6c839 | 3370 | size_t leb128_size; |
08922a10 SS |
3371 | |
3372 | if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31) | |
3373 | { | |
08922a10 | 3374 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3375 | locexpr_regname (gdbarch, data[0] - DW_OP_reg0)); |
08922a10 SS |
3376 | data += 1; |
3377 | } | |
3378 | else if (data[0] == DW_OP_regx) | |
3379 | { | |
9fccedf7 | 3380 | uint64_t reg; |
4c2df51b | 3381 | |
f664829e | 3382 | data = safe_read_uleb128 (data + 1, end, ®); |
08922a10 | 3383 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3384 | locexpr_regname (gdbarch, reg)); |
08922a10 SS |
3385 | } |
3386 | else if (data[0] == DW_OP_fbreg) | |
4c2df51b | 3387 | { |
08922a10 SS |
3388 | struct block *b; |
3389 | struct symbol *framefunc; | |
3390 | int frame_reg = 0; | |
9fccedf7 | 3391 | int64_t frame_offset; |
7155d578 | 3392 | const gdb_byte *base_data, *new_data, *save_data = data; |
08922a10 | 3393 | size_t base_size; |
9fccedf7 | 3394 | int64_t base_offset = 0; |
08922a10 | 3395 | |
f664829e | 3396 | new_data = safe_read_sleb128 (data + 1, end, &frame_offset); |
9eae7c52 TT |
3397 | if (!piece_end_p (new_data, end)) |
3398 | return data; | |
3399 | data = new_data; | |
3400 | ||
08922a10 SS |
3401 | b = block_for_pc (addr); |
3402 | ||
3403 | if (!b) | |
3404 | error (_("No block found for address for symbol \"%s\"."), | |
3405 | SYMBOL_PRINT_NAME (symbol)); | |
3406 | ||
3407 | framefunc = block_linkage_function (b); | |
3408 | ||
3409 | if (!framefunc) | |
3410 | error (_("No function found for block for symbol \"%s\"."), | |
3411 | SYMBOL_PRINT_NAME (symbol)); | |
3412 | ||
3413 | dwarf_expr_frame_base_1 (framefunc, addr, &base_data, &base_size); | |
3414 | ||
3415 | if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31) | |
3416 | { | |
0d45f56e | 3417 | const gdb_byte *buf_end; |
08922a10 SS |
3418 | |
3419 | frame_reg = base_data[0] - DW_OP_breg0; | |
f664829e DE |
3420 | buf_end = safe_read_sleb128 (base_data + 1, base_data + base_size, |
3421 | &base_offset); | |
08922a10 | 3422 | if (buf_end != base_data + base_size) |
3e43a32a MS |
3423 | error (_("Unexpected opcode after " |
3424 | "DW_OP_breg%u for symbol \"%s\"."), | |
08922a10 SS |
3425 | frame_reg, SYMBOL_PRINT_NAME (symbol)); |
3426 | } | |
3427 | else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31) | |
3428 | { | |
3429 | /* The frame base is just the register, with no offset. */ | |
3430 | frame_reg = base_data[0] - DW_OP_reg0; | |
3431 | base_offset = 0; | |
3432 | } | |
3433 | else | |
3434 | { | |
3435 | /* We don't know what to do with the frame base expression, | |
3436 | so we can't trace this variable; give up. */ | |
7155d578 | 3437 | return save_data; |
08922a10 SS |
3438 | } |
3439 | ||
3e43a32a MS |
3440 | fprintf_filtered (stream, |
3441 | _("a variable at frame base reg $%s offset %s+%s"), | |
5e44ecb3 | 3442 | locexpr_regname (gdbarch, frame_reg), |
08922a10 SS |
3443 | plongest (base_offset), plongest (frame_offset)); |
3444 | } | |
9eae7c52 TT |
3445 | else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31 |
3446 | && piece_end_p (data, end)) | |
08922a10 | 3447 | { |
9fccedf7 | 3448 | int64_t offset; |
08922a10 | 3449 | |
f664829e | 3450 | data = safe_read_sleb128 (data + 1, end, &offset); |
08922a10 | 3451 | |
4c2df51b | 3452 | fprintf_filtered (stream, |
08922a10 SS |
3453 | _("a variable at offset %s from base reg $%s"), |
3454 | plongest (offset), | |
5e44ecb3 | 3455 | locexpr_regname (gdbarch, data[0] - DW_OP_breg0)); |
4c2df51b DJ |
3456 | } |
3457 | ||
c3228f12 EZ |
3458 | /* The location expression for a TLS variable looks like this (on a |
3459 | 64-bit LE machine): | |
3460 | ||
3461 | DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0 | |
3462 | (DW_OP_addr: 4; DW_OP_GNU_push_tls_address) | |
09d8bd00 | 3463 | |
c3228f12 EZ |
3464 | 0x3 is the encoding for DW_OP_addr, which has an operand as long |
3465 | as the size of an address on the target machine (here is 8 | |
09d8bd00 TT |
3466 | bytes). Note that more recent version of GCC emit DW_OP_const4u |
3467 | or DW_OP_const8u, depending on address size, rather than | |
0963b4bd MS |
3468 | DW_OP_addr. 0xe0 is the encoding for DW_OP_GNU_push_tls_address. |
3469 | The operand represents the offset at which the variable is within | |
3470 | the thread local storage. */ | |
c3228f12 | 3471 | |
9eae7c52 | 3472 | else if (data + 1 + addr_size < end |
09d8bd00 TT |
3473 | && (data[0] == DW_OP_addr |
3474 | || (addr_size == 4 && data[0] == DW_OP_const4u) | |
3475 | || (addr_size == 8 && data[0] == DW_OP_const8u)) | |
9eae7c52 TT |
3476 | && data[1 + addr_size] == DW_OP_GNU_push_tls_address |
3477 | && piece_end_p (data + 2 + addr_size, end)) | |
08922a10 | 3478 | { |
d4a087c7 UW |
3479 | ULONGEST offset; |
3480 | offset = extract_unsigned_integer (data + 1, addr_size, | |
3481 | gdbarch_byte_order (gdbarch)); | |
9a619af0 | 3482 | |
08922a10 | 3483 | fprintf_filtered (stream, |
d4a087c7 | 3484 | _("a thread-local variable at offset 0x%s " |
08922a10 | 3485 | "in the thread-local storage for `%s'"), |
d4a087c7 | 3486 | phex_nz (offset, addr_size), objfile->name); |
08922a10 SS |
3487 | |
3488 | data += 1 + addr_size + 1; | |
3489 | } | |
49f6c839 DE |
3490 | |
3491 | /* With -gsplit-dwarf a TLS variable can also look like this: | |
3492 | DW_AT_location : 3 byte block: fc 4 e0 | |
3493 | (DW_OP_GNU_const_index: 4; | |
3494 | DW_OP_GNU_push_tls_address) */ | |
3495 | else if (data + 3 <= end | |
3496 | && data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end | |
3497 | && data[0] == DW_OP_GNU_const_index | |
3498 | && leb128_size > 0 | |
3499 | && data[1 + leb128_size] == DW_OP_GNU_push_tls_address | |
3500 | && piece_end_p (data + 2 + leb128_size, end)) | |
3501 | { | |
a55c1f32 | 3502 | uint64_t offset; |
49f6c839 DE |
3503 | |
3504 | data = safe_read_uleb128 (data + 1, end, &offset); | |
3505 | offset = dwarf2_read_addr_index (per_cu, offset); | |
3506 | fprintf_filtered (stream, | |
3507 | _("a thread-local variable at offset 0x%s " | |
3508 | "in the thread-local storage for `%s'"), | |
3509 | phex_nz (offset, addr_size), objfile->name); | |
3510 | ++data; | |
3511 | } | |
3512 | ||
9eae7c52 TT |
3513 | else if (data[0] >= DW_OP_lit0 |
3514 | && data[0] <= DW_OP_lit31 | |
3515 | && data + 1 < end | |
3516 | && data[1] == DW_OP_stack_value) | |
3517 | { | |
3518 | fprintf_filtered (stream, _("the constant %d"), data[0] - DW_OP_lit0); | |
3519 | data += 2; | |
3520 | } | |
3521 | ||
3522 | return data; | |
3523 | } | |
3524 | ||
3525 | /* Disassemble an expression, stopping at the end of a piece or at the | |
3526 | end of the expression. Returns a pointer to the next unread byte | |
3527 | in the input expression. If ALL is nonzero, then this function | |
f664829e DE |
3528 | will keep going until it reaches the end of the expression. |
3529 | If there is an error during reading, e.g. we run off the end | |
3530 | of the buffer, an error is thrown. */ | |
9eae7c52 TT |
3531 | |
3532 | static const gdb_byte * | |
3533 | disassemble_dwarf_expression (struct ui_file *stream, | |
3534 | struct gdbarch *arch, unsigned int addr_size, | |
2bda9cc5 | 3535 | int offset_size, const gdb_byte *start, |
9eae7c52 | 3536 | const gdb_byte *data, const gdb_byte *end, |
2bda9cc5 | 3537 | int indent, int all, |
5e44ecb3 | 3538 | struct dwarf2_per_cu_data *per_cu) |
9eae7c52 | 3539 | { |
9eae7c52 TT |
3540 | while (data < end |
3541 | && (all | |
3542 | || (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece))) | |
3543 | { | |
3544 | enum dwarf_location_atom op = *data++; | |
9fccedf7 DE |
3545 | uint64_t ul; |
3546 | int64_t l; | |
9eae7c52 TT |
3547 | const char *name; |
3548 | ||
f39c6ffd | 3549 | name = get_DW_OP_name (op); |
9eae7c52 TT |
3550 | |
3551 | if (!name) | |
3552 | error (_("Unrecognized DWARF opcode 0x%02x at %ld"), | |
06826322 | 3553 | op, (long) (data - 1 - start)); |
2bda9cc5 JK |
3554 | fprintf_filtered (stream, " %*ld: %s", indent + 4, |
3555 | (long) (data - 1 - start), name); | |
9eae7c52 TT |
3556 | |
3557 | switch (op) | |
3558 | { | |
3559 | case DW_OP_addr: | |
d4a087c7 UW |
3560 | ul = extract_unsigned_integer (data, addr_size, |
3561 | gdbarch_byte_order (arch)); | |
9eae7c52 | 3562 | data += addr_size; |
d4a087c7 | 3563 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); |
9eae7c52 TT |
3564 | break; |
3565 | ||
3566 | case DW_OP_const1u: | |
3567 | ul = extract_unsigned_integer (data, 1, gdbarch_byte_order (arch)); | |
3568 | data += 1; | |
3569 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3570 | break; | |
3571 | case DW_OP_const1s: | |
3572 | l = extract_signed_integer (data, 1, gdbarch_byte_order (arch)); | |
3573 | data += 1; | |
3574 | fprintf_filtered (stream, " %s", plongest (l)); | |
3575 | break; | |
3576 | case DW_OP_const2u: | |
3577 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3578 | data += 2; | |
3579 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3580 | break; | |
3581 | case DW_OP_const2s: | |
3582 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3583 | data += 2; | |
3584 | fprintf_filtered (stream, " %s", plongest (l)); | |
3585 | break; | |
3586 | case DW_OP_const4u: | |
3587 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3588 | data += 4; | |
3589 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3590 | break; | |
3591 | case DW_OP_const4s: | |
3592 | l = extract_signed_integer (data, 4, gdbarch_byte_order (arch)); | |
3593 | data += 4; | |
3594 | fprintf_filtered (stream, " %s", plongest (l)); | |
3595 | break; | |
3596 | case DW_OP_const8u: | |
3597 | ul = extract_unsigned_integer (data, 8, gdbarch_byte_order (arch)); | |
3598 | data += 8; | |
3599 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3600 | break; | |
3601 | case DW_OP_const8s: | |
3602 | l = extract_signed_integer (data, 8, gdbarch_byte_order (arch)); | |
3603 | data += 8; | |
3604 | fprintf_filtered (stream, " %s", plongest (l)); | |
3605 | break; | |
3606 | case DW_OP_constu: | |
f664829e | 3607 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3608 | fprintf_filtered (stream, " %s", pulongest (ul)); |
3609 | break; | |
3610 | case DW_OP_consts: | |
f664829e | 3611 | data = safe_read_sleb128 (data, end, &l); |
9eae7c52 TT |
3612 | fprintf_filtered (stream, " %s", plongest (l)); |
3613 | break; | |
3614 | ||
3615 | case DW_OP_reg0: | |
3616 | case DW_OP_reg1: | |
3617 | case DW_OP_reg2: | |
3618 | case DW_OP_reg3: | |
3619 | case DW_OP_reg4: | |
3620 | case DW_OP_reg5: | |
3621 | case DW_OP_reg6: | |
3622 | case DW_OP_reg7: | |
3623 | case DW_OP_reg8: | |
3624 | case DW_OP_reg9: | |
3625 | case DW_OP_reg10: | |
3626 | case DW_OP_reg11: | |
3627 | case DW_OP_reg12: | |
3628 | case DW_OP_reg13: | |
3629 | case DW_OP_reg14: | |
3630 | case DW_OP_reg15: | |
3631 | case DW_OP_reg16: | |
3632 | case DW_OP_reg17: | |
3633 | case DW_OP_reg18: | |
3634 | case DW_OP_reg19: | |
3635 | case DW_OP_reg20: | |
3636 | case DW_OP_reg21: | |
3637 | case DW_OP_reg22: | |
3638 | case DW_OP_reg23: | |
3639 | case DW_OP_reg24: | |
3640 | case DW_OP_reg25: | |
3641 | case DW_OP_reg26: | |
3642 | case DW_OP_reg27: | |
3643 | case DW_OP_reg28: | |
3644 | case DW_OP_reg29: | |
3645 | case DW_OP_reg30: | |
3646 | case DW_OP_reg31: | |
3647 | fprintf_filtered (stream, " [$%s]", | |
5e44ecb3 | 3648 | locexpr_regname (arch, op - DW_OP_reg0)); |
9eae7c52 TT |
3649 | break; |
3650 | ||
3651 | case DW_OP_regx: | |
f664829e | 3652 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 | 3653 | fprintf_filtered (stream, " %s [$%s]", pulongest (ul), |
5e44ecb3 | 3654 | locexpr_regname (arch, (int) ul)); |
9eae7c52 TT |
3655 | break; |
3656 | ||
3657 | case DW_OP_implicit_value: | |
f664829e | 3658 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3659 | data += ul; |
3660 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3661 | break; | |
3662 | ||
3663 | case DW_OP_breg0: | |
3664 | case DW_OP_breg1: | |
3665 | case DW_OP_breg2: | |
3666 | case DW_OP_breg3: | |
3667 | case DW_OP_breg4: | |
3668 | case DW_OP_breg5: | |
3669 | case DW_OP_breg6: | |
3670 | case DW_OP_breg7: | |
3671 | case DW_OP_breg8: | |
3672 | case DW_OP_breg9: | |
3673 | case DW_OP_breg10: | |
3674 | case DW_OP_breg11: | |
3675 | case DW_OP_breg12: | |
3676 | case DW_OP_breg13: | |
3677 | case DW_OP_breg14: | |
3678 | case DW_OP_breg15: | |
3679 | case DW_OP_breg16: | |
3680 | case DW_OP_breg17: | |
3681 | case DW_OP_breg18: | |
3682 | case DW_OP_breg19: | |
3683 | case DW_OP_breg20: | |
3684 | case DW_OP_breg21: | |
3685 | case DW_OP_breg22: | |
3686 | case DW_OP_breg23: | |
3687 | case DW_OP_breg24: | |
3688 | case DW_OP_breg25: | |
3689 | case DW_OP_breg26: | |
3690 | case DW_OP_breg27: | |
3691 | case DW_OP_breg28: | |
3692 | case DW_OP_breg29: | |
3693 | case DW_OP_breg30: | |
3694 | case DW_OP_breg31: | |
f664829e | 3695 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 3696 | fprintf_filtered (stream, " %s [$%s]", plongest (l), |
5e44ecb3 | 3697 | locexpr_regname (arch, op - DW_OP_breg0)); |
9eae7c52 TT |
3698 | break; |
3699 | ||
3700 | case DW_OP_bregx: | |
f664829e DE |
3701 | data = safe_read_uleb128 (data, end, &ul); |
3702 | data = safe_read_sleb128 (data, end, &l); | |
0502ed8c JK |
3703 | fprintf_filtered (stream, " register %s [$%s] offset %s", |
3704 | pulongest (ul), | |
5e44ecb3 | 3705 | locexpr_regname (arch, (int) ul), |
0502ed8c | 3706 | plongest (l)); |
9eae7c52 TT |
3707 | break; |
3708 | ||
3709 | case DW_OP_fbreg: | |
f664829e | 3710 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 3711 | fprintf_filtered (stream, " %s", plongest (l)); |
9eae7c52 TT |
3712 | break; |
3713 | ||
3714 | case DW_OP_xderef_size: | |
3715 | case DW_OP_deref_size: | |
3716 | case DW_OP_pick: | |
3717 | fprintf_filtered (stream, " %d", *data); | |
3718 | ++data; | |
3719 | break; | |
3720 | ||
3721 | case DW_OP_plus_uconst: | |
f664829e | 3722 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3723 | fprintf_filtered (stream, " %s", pulongest (ul)); |
3724 | break; | |
3725 | ||
3726 | case DW_OP_skip: | |
3727 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3728 | data += 2; | |
3729 | fprintf_filtered (stream, " to %ld", | |
3730 | (long) (data + l - start)); | |
3731 | break; | |
3732 | ||
3733 | case DW_OP_bra: | |
3734 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3735 | data += 2; | |
3736 | fprintf_filtered (stream, " %ld", | |
3737 | (long) (data + l - start)); | |
3738 | break; | |
3739 | ||
3740 | case DW_OP_call2: | |
3741 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3742 | data += 2; | |
3743 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 2)); | |
3744 | break; | |
3745 | ||
3746 | case DW_OP_call4: | |
3747 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3748 | data += 4; | |
3749 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
3750 | break; | |
3751 | ||
3752 | case DW_OP_call_ref: | |
3753 | ul = extract_unsigned_integer (data, offset_size, | |
3754 | gdbarch_byte_order (arch)); | |
3755 | data += offset_size; | |
3756 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
3757 | break; | |
3758 | ||
3759 | case DW_OP_piece: | |
f664829e | 3760 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3761 | fprintf_filtered (stream, " %s (bytes)", pulongest (ul)); |
3762 | break; | |
3763 | ||
3764 | case DW_OP_bit_piece: | |
3765 | { | |
9fccedf7 | 3766 | uint64_t offset; |
9eae7c52 | 3767 | |
f664829e DE |
3768 | data = safe_read_uleb128 (data, end, &ul); |
3769 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
3770 | fprintf_filtered (stream, " size %s offset %s (bits)", |
3771 | pulongest (ul), pulongest (offset)); | |
3772 | } | |
3773 | break; | |
8cf6f0b1 TT |
3774 | |
3775 | case DW_OP_GNU_implicit_pointer: | |
3776 | { | |
3777 | ul = extract_unsigned_integer (data, offset_size, | |
3778 | gdbarch_byte_order (arch)); | |
3779 | data += offset_size; | |
3780 | ||
f664829e | 3781 | data = safe_read_sleb128 (data, end, &l); |
8cf6f0b1 TT |
3782 | |
3783 | fprintf_filtered (stream, " DIE %s offset %s", | |
3784 | phex_nz (ul, offset_size), | |
3785 | plongest (l)); | |
3786 | } | |
3787 | break; | |
5e44ecb3 TT |
3788 | |
3789 | case DW_OP_GNU_deref_type: | |
3790 | { | |
3791 | int addr_size = *data++; | |
b64f50a1 | 3792 | cu_offset offset; |
5e44ecb3 TT |
3793 | struct type *type; |
3794 | ||
f664829e | 3795 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 3796 | offset.cu_off = ul; |
5e44ecb3 TT |
3797 | type = dwarf2_get_die_type (offset, per_cu); |
3798 | fprintf_filtered (stream, "<"); | |
3799 | type_print (type, "", stream, -1); | |
b64f50a1 | 3800 | fprintf_filtered (stream, " [0x%s]> %d", phex_nz (offset.cu_off, 0), |
5e44ecb3 TT |
3801 | addr_size); |
3802 | } | |
3803 | break; | |
3804 | ||
3805 | case DW_OP_GNU_const_type: | |
3806 | { | |
b64f50a1 | 3807 | cu_offset type_die; |
5e44ecb3 TT |
3808 | struct type *type; |
3809 | ||
f664829e | 3810 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 3811 | type_die.cu_off = ul; |
5e44ecb3 TT |
3812 | type = dwarf2_get_die_type (type_die, per_cu); |
3813 | fprintf_filtered (stream, "<"); | |
3814 | type_print (type, "", stream, -1); | |
b64f50a1 | 3815 | fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die.cu_off, 0)); |
5e44ecb3 TT |
3816 | } |
3817 | break; | |
3818 | ||
3819 | case DW_OP_GNU_regval_type: | |
3820 | { | |
9fccedf7 | 3821 | uint64_t reg; |
b64f50a1 | 3822 | cu_offset type_die; |
5e44ecb3 TT |
3823 | struct type *type; |
3824 | ||
f664829e DE |
3825 | data = safe_read_uleb128 (data, end, ®); |
3826 | data = safe_read_uleb128 (data, end, &ul); | |
b64f50a1 | 3827 | type_die.cu_off = ul; |
5e44ecb3 TT |
3828 | |
3829 | type = dwarf2_get_die_type (type_die, per_cu); | |
3830 | fprintf_filtered (stream, "<"); | |
3831 | type_print (type, "", stream, -1); | |
b64f50a1 JK |
3832 | fprintf_filtered (stream, " [0x%s]> [$%s]", |
3833 | phex_nz (type_die.cu_off, 0), | |
5e44ecb3 TT |
3834 | locexpr_regname (arch, reg)); |
3835 | } | |
3836 | break; | |
3837 | ||
3838 | case DW_OP_GNU_convert: | |
3839 | case DW_OP_GNU_reinterpret: | |
3840 | { | |
b64f50a1 | 3841 | cu_offset type_die; |
5e44ecb3 | 3842 | |
f664829e | 3843 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 3844 | type_die.cu_off = ul; |
5e44ecb3 | 3845 | |
b64f50a1 | 3846 | if (type_die.cu_off == 0) |
5e44ecb3 TT |
3847 | fprintf_filtered (stream, "<0>"); |
3848 | else | |
3849 | { | |
3850 | struct type *type; | |
3851 | ||
3852 | type = dwarf2_get_die_type (type_die, per_cu); | |
3853 | fprintf_filtered (stream, "<"); | |
3854 | type_print (type, "", stream, -1); | |
b64f50a1 | 3855 | fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die.cu_off, 0)); |
5e44ecb3 TT |
3856 | } |
3857 | } | |
3858 | break; | |
2bda9cc5 JK |
3859 | |
3860 | case DW_OP_GNU_entry_value: | |
f664829e | 3861 | data = safe_read_uleb128 (data, end, &ul); |
2bda9cc5 JK |
3862 | fputc_filtered ('\n', stream); |
3863 | disassemble_dwarf_expression (stream, arch, addr_size, offset_size, | |
3864 | start, data, data + ul, indent + 2, | |
3865 | all, per_cu); | |
3866 | data += ul; | |
3867 | continue; | |
49f6c839 | 3868 | |
a24f71ab JK |
3869 | case DW_OP_GNU_parameter_ref: |
3870 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3871 | data += 4; | |
3872 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
3873 | break; | |
3874 | ||
49f6c839 DE |
3875 | case DW_OP_GNU_addr_index: |
3876 | data = safe_read_uleb128 (data, end, &ul); | |
3877 | ul = dwarf2_read_addr_index (per_cu, ul); | |
3878 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); | |
3879 | break; | |
3880 | case DW_OP_GNU_const_index: | |
3881 | data = safe_read_uleb128 (data, end, &ul); | |
3882 | ul = dwarf2_read_addr_index (per_cu, ul); | |
3883 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3884 | break; | |
9eae7c52 TT |
3885 | } |
3886 | ||
3887 | fprintf_filtered (stream, "\n"); | |
3888 | } | |
c3228f12 | 3889 | |
08922a10 | 3890 | return data; |
4c2df51b DJ |
3891 | } |
3892 | ||
08922a10 SS |
3893 | /* Describe a single location, which may in turn consist of multiple |
3894 | pieces. */ | |
a55cc764 | 3895 | |
08922a10 SS |
3896 | static void |
3897 | locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr, | |
0d45f56e | 3898 | struct ui_file *stream, |
56eb65bd | 3899 | const gdb_byte *data, size_t size, |
9eae7c52 | 3900 | struct objfile *objfile, unsigned int addr_size, |
5e44ecb3 | 3901 | int offset_size, struct dwarf2_per_cu_data *per_cu) |
08922a10 | 3902 | { |
0d45f56e | 3903 | const gdb_byte *end = data + size; |
9eae7c52 | 3904 | int first_piece = 1, bad = 0; |
08922a10 | 3905 | |
08922a10 SS |
3906 | while (data < end) |
3907 | { | |
9eae7c52 TT |
3908 | const gdb_byte *here = data; |
3909 | int disassemble = 1; | |
3910 | ||
3911 | if (first_piece) | |
3912 | first_piece = 0; | |
3913 | else | |
3914 | fprintf_filtered (stream, _(", and ")); | |
08922a10 | 3915 | |
9eae7c52 TT |
3916 | if (!dwarf2_always_disassemble) |
3917 | { | |
3e43a32a | 3918 | data = locexpr_describe_location_piece (symbol, stream, |
49f6c839 | 3919 | addr, objfile, per_cu, |
9eae7c52 TT |
3920 | data, end, addr_size); |
3921 | /* If we printed anything, or if we have an empty piece, | |
3922 | then don't disassemble. */ | |
3923 | if (data != here | |
3924 | || data[0] == DW_OP_piece | |
3925 | || data[0] == DW_OP_bit_piece) | |
3926 | disassemble = 0; | |
08922a10 | 3927 | } |
9eae7c52 | 3928 | if (disassemble) |
2bda9cc5 JK |
3929 | { |
3930 | fprintf_filtered (stream, _("a complex DWARF expression:\n")); | |
3931 | data = disassemble_dwarf_expression (stream, | |
3932 | get_objfile_arch (objfile), | |
3933 | addr_size, offset_size, data, | |
3934 | data, end, 0, | |
3935 | dwarf2_always_disassemble, | |
3936 | per_cu); | |
3937 | } | |
9eae7c52 TT |
3938 | |
3939 | if (data < end) | |
08922a10 | 3940 | { |
9eae7c52 | 3941 | int empty = data == here; |
08922a10 | 3942 | |
9eae7c52 TT |
3943 | if (disassemble) |
3944 | fprintf_filtered (stream, " "); | |
3945 | if (data[0] == DW_OP_piece) | |
3946 | { | |
9fccedf7 | 3947 | uint64_t bytes; |
08922a10 | 3948 | |
f664829e | 3949 | data = safe_read_uleb128 (data + 1, end, &bytes); |
08922a10 | 3950 | |
9eae7c52 TT |
3951 | if (empty) |
3952 | fprintf_filtered (stream, _("an empty %s-byte piece"), | |
3953 | pulongest (bytes)); | |
3954 | else | |
3955 | fprintf_filtered (stream, _(" [%s-byte piece]"), | |
3956 | pulongest (bytes)); | |
3957 | } | |
3958 | else if (data[0] == DW_OP_bit_piece) | |
3959 | { | |
9fccedf7 | 3960 | uint64_t bits, offset; |
9eae7c52 | 3961 | |
f664829e DE |
3962 | data = safe_read_uleb128 (data + 1, end, &bits); |
3963 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
3964 | |
3965 | if (empty) | |
3966 | fprintf_filtered (stream, | |
3967 | _("an empty %s-bit piece"), | |
3968 | pulongest (bits)); | |
3969 | else | |
3970 | fprintf_filtered (stream, | |
3971 | _(" [%s-bit piece, offset %s bits]"), | |
3972 | pulongest (bits), pulongest (offset)); | |
3973 | } | |
3974 | else | |
3975 | { | |
3976 | bad = 1; | |
3977 | break; | |
3978 | } | |
08922a10 SS |
3979 | } |
3980 | } | |
3981 | ||
3982 | if (bad || data > end) | |
3983 | error (_("Corrupted DWARF2 expression for \"%s\"."), | |
3984 | SYMBOL_PRINT_NAME (symbol)); | |
3985 | } | |
3986 | ||
3987 | /* Print a natural-language description of SYMBOL to STREAM. This | |
3988 | version is for a symbol with a single location. */ | |
a55cc764 | 3989 | |
08922a10 SS |
3990 | static void |
3991 | locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
3992 | struct ui_file *stream) | |
3993 | { | |
3994 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
3995 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); | |
3996 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 3997 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
08922a10 | 3998 | |
3e43a32a MS |
3999 | locexpr_describe_location_1 (symbol, addr, stream, |
4000 | dlbaton->data, dlbaton->size, | |
5e44ecb3 TT |
4001 | objfile, addr_size, offset_size, |
4002 | dlbaton->per_cu); | |
08922a10 SS |
4003 | } |
4004 | ||
4005 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4006 | any necessary bytecode in AX. */ | |
a55cc764 | 4007 | |
0d53c4c4 | 4008 | static void |
505e835d UW |
4009 | locexpr_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch, |
4010 | struct agent_expr *ax, struct axs_value *value) | |
a55cc764 DJ |
4011 | { |
4012 | struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
3cf03773 | 4013 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
a55cc764 | 4014 | |
1d6edc3c | 4015 | if (dlbaton->size == 0) |
cabe9ab6 PA |
4016 | value->optimized_out = 1; |
4017 | else | |
9f6f94ff TT |
4018 | dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, |
4019 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4020 | dlbaton->per_cu); | |
a55cc764 DJ |
4021 | } |
4022 | ||
4c2df51b DJ |
4023 | /* The set of location functions used with the DWARF-2 expression |
4024 | evaluator. */ | |
768a979c | 4025 | const struct symbol_computed_ops dwarf2_locexpr_funcs = { |
4c2df51b | 4026 | locexpr_read_variable, |
e18b2753 | 4027 | locexpr_read_variable_at_entry, |
4c2df51b DJ |
4028 | locexpr_read_needs_frame, |
4029 | locexpr_describe_location, | |
f1e6e072 | 4030 | 0, /* location_has_loclist */ |
a55cc764 | 4031 | locexpr_tracepoint_var_ref |
4c2df51b | 4032 | }; |
0d53c4c4 DJ |
4033 | |
4034 | ||
4035 | /* Wrapper functions for location lists. These generally find | |
4036 | the appropriate location expression and call something above. */ | |
4037 | ||
4038 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
4039 | evaluator to calculate the location. */ | |
4040 | static struct value * | |
4041 | loclist_read_variable (struct symbol *symbol, struct frame_info *frame) | |
4042 | { | |
4043 | struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
4044 | struct value *val; | |
947bb88f | 4045 | const gdb_byte *data; |
b6b08ebf | 4046 | size_t size; |
8cf6f0b1 | 4047 | CORE_ADDR pc = frame ? get_frame_address_in_block (frame) : 0; |
0d53c4c4 | 4048 | |
8cf6f0b1 | 4049 | data = dwarf2_find_location_expression (dlbaton, &size, pc); |
1d6edc3c JK |
4050 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, data, size, |
4051 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4052 | |
4053 | return val; | |
4054 | } | |
4055 | ||
e18b2753 JK |
4056 | /* Read variable SYMBOL like loclist_read_variable at (callee) FRAME's function |
4057 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
4058 | will be thrown. | |
4059 | ||
4060 | Function always returns non-NULL value, it may be marked optimized out if | |
4061 | inferior frame information is not available. It throws NO_ENTRY_VALUE_ERROR | |
4062 | if it cannot resolve the parameter for any reason. */ | |
4063 | ||
4064 | static struct value * | |
4065 | loclist_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
4066 | { | |
4067 | struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
4068 | const gdb_byte *data; | |
4069 | size_t size; | |
4070 | CORE_ADDR pc; | |
4071 | ||
4072 | if (frame == NULL || !get_frame_func_if_available (frame, &pc)) | |
4073 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4074 | ||
4075 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4076 | if (data == NULL) | |
4077 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4078 | ||
4079 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, data, size); | |
4080 | } | |
4081 | ||
0d53c4c4 DJ |
4082 | /* Return non-zero iff we need a frame to evaluate SYMBOL. */ |
4083 | static int | |
4084 | loclist_read_needs_frame (struct symbol *symbol) | |
4085 | { | |
4086 | /* If there's a location list, then assume we need to have a frame | |
4087 | to choose the appropriate location expression. With tracking of | |
4088 | global variables this is not necessarily true, but such tracking | |
4089 | is disabled in GCC at the moment until we figure out how to | |
4090 | represent it. */ | |
4091 | ||
4092 | return 1; | |
4093 | } | |
4094 | ||
08922a10 SS |
4095 | /* Print a natural-language description of SYMBOL to STREAM. This |
4096 | version applies when there is a list of different locations, each | |
4097 | with a specified address range. */ | |
4098 | ||
4099 | static void | |
4100 | loclist_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4101 | struct ui_file *stream) | |
0d53c4c4 | 4102 | { |
08922a10 | 4103 | struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); |
947bb88f | 4104 | const gdb_byte *loc_ptr, *buf_end; |
08922a10 SS |
4105 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4106 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
4107 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
4108 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4109 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
d4a087c7 | 4110 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
08922a10 | 4111 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 4112 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); |
08922a10 | 4113 | CORE_ADDR base_address = dlbaton->base_address + base_offset; |
f664829e | 4114 | int done = 0; |
08922a10 SS |
4115 | |
4116 | loc_ptr = dlbaton->data; | |
4117 | buf_end = dlbaton->data + dlbaton->size; | |
4118 | ||
9eae7c52 | 4119 | fprintf_filtered (stream, _("multi-location:\n")); |
08922a10 SS |
4120 | |
4121 | /* Iterate through locations until we run out. */ | |
f664829e | 4122 | while (!done) |
08922a10 | 4123 | { |
f664829e DE |
4124 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
4125 | int length; | |
4126 | enum debug_loc_kind kind; | |
4127 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
4128 | ||
4129 | if (dlbaton->from_dwo) | |
4130 | kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu, | |
4131 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 4132 | &low, &high, byte_order); |
d4a087c7 | 4133 | else |
f664829e DE |
4134 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
4135 | &low, &high, | |
4136 | byte_order, addr_size, | |
4137 | signed_addr_p); | |
4138 | loc_ptr = new_ptr; | |
4139 | switch (kind) | |
08922a10 | 4140 | { |
f664829e DE |
4141 | case DEBUG_LOC_END_OF_LIST: |
4142 | done = 1; | |
4143 | continue; | |
4144 | case DEBUG_LOC_BASE_ADDRESS: | |
d4a087c7 | 4145 | base_address = high + base_offset; |
9eae7c52 | 4146 | fprintf_filtered (stream, _(" Base address %s"), |
08922a10 | 4147 | paddress (gdbarch, base_address)); |
08922a10 | 4148 | continue; |
3771a44c DE |
4149 | case DEBUG_LOC_START_END: |
4150 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
4151 | break; |
4152 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
4153 | case DEBUG_LOC_INVALID_ENTRY: | |
4154 | error (_("Corrupted DWARF expression for symbol \"%s\"."), | |
4155 | SYMBOL_PRINT_NAME (symbol)); | |
4156 | default: | |
4157 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
08922a10 SS |
4158 | } |
4159 | ||
08922a10 SS |
4160 | /* Otherwise, a location expression entry. */ |
4161 | low += base_address; | |
4162 | high += base_address; | |
4163 | ||
4164 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); | |
4165 | loc_ptr += 2; | |
4166 | ||
08922a10 SS |
4167 | /* (It would improve readability to print only the minimum |
4168 | necessary digits of the second number of the range.) */ | |
9eae7c52 | 4169 | fprintf_filtered (stream, _(" Range %s-%s: "), |
08922a10 SS |
4170 | paddress (gdbarch, low), paddress (gdbarch, high)); |
4171 | ||
4172 | /* Now describe this particular location. */ | |
4173 | locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length, | |
5e44ecb3 TT |
4174 | objfile, addr_size, offset_size, |
4175 | dlbaton->per_cu); | |
9eae7c52 TT |
4176 | |
4177 | fprintf_filtered (stream, "\n"); | |
08922a10 SS |
4178 | |
4179 | loc_ptr += length; | |
4180 | } | |
0d53c4c4 DJ |
4181 | } |
4182 | ||
4183 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4184 | any necessary bytecode in AX. */ | |
4185 | static void | |
505e835d UW |
4186 | loclist_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch, |
4187 | struct agent_expr *ax, struct axs_value *value) | |
0d53c4c4 DJ |
4188 | { |
4189 | struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4190 | const gdb_byte *data; |
b6b08ebf | 4191 | size_t size; |
3cf03773 | 4192 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
0d53c4c4 | 4193 | |
8cf6f0b1 | 4194 | data = dwarf2_find_location_expression (dlbaton, &size, ax->scope); |
1d6edc3c | 4195 | if (size == 0) |
cabe9ab6 PA |
4196 | value->optimized_out = 1; |
4197 | else | |
9f6f94ff TT |
4198 | dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, data, data + size, |
4199 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4200 | } |
4201 | ||
4202 | /* The set of location functions used with the DWARF-2 expression | |
4203 | evaluator and location lists. */ | |
768a979c | 4204 | const struct symbol_computed_ops dwarf2_loclist_funcs = { |
0d53c4c4 | 4205 | loclist_read_variable, |
e18b2753 | 4206 | loclist_read_variable_at_entry, |
0d53c4c4 DJ |
4207 | loclist_read_needs_frame, |
4208 | loclist_describe_location, | |
f1e6e072 | 4209 | 1, /* location_has_loclist */ |
0d53c4c4 DJ |
4210 | loclist_tracepoint_var_ref |
4211 | }; | |
8e3b41a9 | 4212 | |
70221824 PA |
4213 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
4214 | extern initialize_file_ftype _initialize_dwarf2loc; | |
4215 | ||
8e3b41a9 JK |
4216 | void |
4217 | _initialize_dwarf2loc (void) | |
4218 | { | |
ccce17b0 YQ |
4219 | add_setshow_zuinteger_cmd ("entry-values", class_maintenance, |
4220 | &entry_values_debug, | |
4221 | _("Set entry values and tail call frames " | |
4222 | "debugging."), | |
4223 | _("Show entry values and tail call frames " | |
4224 | "debugging."), | |
4225 | _("When non-zero, the process of determining " | |
4226 | "parameter values from function entry point " | |
4227 | "and tail call frames will be printed."), | |
4228 | NULL, | |
4229 | show_entry_values_debug, | |
4230 | &setdebuglist, &showdebuglist); | |
8e3b41a9 | 4231 | } |