Commit | Line | Data |
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4c2df51b | 1 | /* DWARF 2 location expression support for GDB. |
feb13ab0 | 2 | |
b811d2c2 | 3 | Copyright (C) 2003-2020 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" | |
4de283e4 TT |
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" | |
d55e5aa6 | 29 | #include "ax.h" |
4de283e4 TT |
30 | #include "ax-gdb.h" |
31 | #include "regcache.h" | |
32 | #include "objfiles.h" | |
edb3359d | 33 | #include "block.h" |
4de283e4 | 34 | #include "gdbcmd.h" |
0fde2c53 | 35 | #include "complaints.h" |
fa8f86ff | 36 | #include "dwarf2.h" |
82ca8957 TT |
37 | #include "dwarf2/expr.h" |
38 | #include "dwarf2/loc.h" | |
39 | #include "dwarf2/read.h" | |
40 | #include "dwarf2/frame.h" | |
f4382c45 | 41 | #include "dwarf2/leb.h" |
4de283e4 | 42 | #include "compile/compile.h" |
268a13a5 | 43 | #include "gdbsupport/selftest.h" |
4de283e4 TT |
44 | #include <algorithm> |
45 | #include <vector> | |
46 | #include <unordered_set> | |
268a13a5 TT |
47 | #include "gdbsupport/underlying.h" |
48 | #include "gdbsupport/byte-vector.h" | |
4c2df51b | 49 | |
1632a688 JK |
50 | static struct value *dwarf2_evaluate_loc_desc_full (struct type *type, |
51 | struct frame_info *frame, | |
52 | const gdb_byte *data, | |
56eb65bd SP |
53 | size_t size, |
54 | struct dwarf2_per_cu_data *per_cu, | |
7942e96e AA |
55 | struct type *subobj_type, |
56 | LONGEST subobj_byte_offset); | |
8cf6f0b1 | 57 | |
192ca6d8 TT |
58 | static struct call_site_parameter *dwarf_expr_reg_to_entry_parameter |
59 | (struct frame_info *frame, | |
60 | enum call_site_parameter_kind kind, | |
61 | union call_site_parameter_u kind_u, | |
62 | struct dwarf2_per_cu_data **per_cu_return); | |
63 | ||
a6b786da KB |
64 | static struct value *indirect_synthetic_pointer |
65 | (sect_offset die, LONGEST byte_offset, | |
66 | struct dwarf2_per_cu_data *per_cu, | |
67 | struct frame_info *frame, | |
e4a62c65 | 68 | struct type *type, bool resolve_abstract_p = false); |
a6b786da | 69 | |
f664829e DE |
70 | /* Until these have formal names, we define these here. |
71 | ref: http://gcc.gnu.org/wiki/DebugFission | |
72 | Each entry in .debug_loc.dwo begins with a byte that describes the entry, | |
73 | and is then followed by data specific to that entry. */ | |
74 | ||
75 | enum debug_loc_kind | |
76 | { | |
77 | /* Indicates the end of the list of entries. */ | |
78 | DEBUG_LOC_END_OF_LIST = 0, | |
79 | ||
80 | /* This is followed by an unsigned LEB128 number that is an index into | |
81 | .debug_addr and specifies the base address for all following entries. */ | |
82 | DEBUG_LOC_BASE_ADDRESS = 1, | |
83 | ||
84 | /* This is followed by two unsigned LEB128 numbers that are indices into | |
85 | .debug_addr and specify the beginning and ending addresses, and then | |
86 | a normal location expression as in .debug_loc. */ | |
3771a44c DE |
87 | DEBUG_LOC_START_END = 2, |
88 | ||
89 | /* This is followed by an unsigned LEB128 number that is an index into | |
90 | .debug_addr and specifies the beginning address, and a 4 byte unsigned | |
91 | number that specifies the length, and then a normal location expression | |
92 | as in .debug_loc. */ | |
93 | DEBUG_LOC_START_LENGTH = 3, | |
f664829e | 94 | |
9fc3eaae | 95 | /* This is followed by two unsigned LEB128 operands. The values of these |
96 | operands are the starting and ending offsets, respectively, relative to | |
97 | the applicable base address. */ | |
98 | DEBUG_LOC_OFFSET_PAIR = 4, | |
99 | ||
f664829e DE |
100 | /* An internal value indicating there is insufficient data. */ |
101 | DEBUG_LOC_BUFFER_OVERFLOW = -1, | |
102 | ||
103 | /* An internal value indicating an invalid kind of entry was found. */ | |
104 | DEBUG_LOC_INVALID_ENTRY = -2 | |
105 | }; | |
106 | ||
b6807d98 TT |
107 | /* Helper function which throws an error if a synthetic pointer is |
108 | invalid. */ | |
109 | ||
110 | static void | |
111 | invalid_synthetic_pointer (void) | |
112 | { | |
113 | error (_("access outside bounds of object " | |
114 | "referenced via synthetic pointer")); | |
115 | } | |
116 | ||
f664829e DE |
117 | /* Decode the addresses in a non-dwo .debug_loc entry. |
118 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
119 | The encoded low,high addresses are return in *LOW,*HIGH. | |
120 | The result indicates the kind of entry found. */ | |
121 | ||
122 | static enum debug_loc_kind | |
123 | decode_debug_loc_addresses (const gdb_byte *loc_ptr, const gdb_byte *buf_end, | |
124 | const gdb_byte **new_ptr, | |
125 | CORE_ADDR *low, CORE_ADDR *high, | |
126 | enum bfd_endian byte_order, | |
127 | unsigned int addr_size, | |
128 | int signed_addr_p) | |
129 | { | |
130 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); | |
131 | ||
132 | if (buf_end - loc_ptr < 2 * addr_size) | |
133 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
134 | ||
135 | if (signed_addr_p) | |
136 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
137 | else | |
138 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
139 | loc_ptr += addr_size; | |
140 | ||
141 | if (signed_addr_p) | |
142 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
143 | else | |
144 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
145 | loc_ptr += addr_size; | |
146 | ||
147 | *new_ptr = loc_ptr; | |
148 | ||
149 | /* A base-address-selection entry. */ | |
150 | if ((*low & base_mask) == base_mask) | |
151 | return DEBUG_LOC_BASE_ADDRESS; | |
152 | ||
153 | /* An end-of-list entry. */ | |
154 | if (*low == 0 && *high == 0) | |
155 | return DEBUG_LOC_END_OF_LIST; | |
156 | ||
3771a44c | 157 | return DEBUG_LOC_START_END; |
f664829e DE |
158 | } |
159 | ||
43988095 JK |
160 | /* Decode the addresses in .debug_loclists entry. |
161 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
162 | The encoded low,high addresses are return in *LOW,*HIGH. | |
163 | The result indicates the kind of entry found. */ | |
164 | ||
165 | static enum debug_loc_kind | |
166 | decode_debug_loclists_addresses (struct dwarf2_per_cu_data *per_cu, | |
167 | const gdb_byte *loc_ptr, | |
168 | const gdb_byte *buf_end, | |
169 | const gdb_byte **new_ptr, | |
170 | CORE_ADDR *low, CORE_ADDR *high, | |
171 | enum bfd_endian byte_order, | |
172 | unsigned int addr_size, | |
173 | int signed_addr_p) | |
174 | { | |
175 | uint64_t u64; | |
176 | ||
177 | if (loc_ptr == buf_end) | |
178 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
179 | ||
180 | switch (*loc_ptr++) | |
181 | { | |
3112ed97 NA |
182 | case DW_LLE_base_addressx: |
183 | *low = 0; | |
184 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
185 | if (loc_ptr == NULL) | |
186 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
187 | *high = dwarf2_read_addr_index (per_cu, u64); | |
188 | *new_ptr = loc_ptr; | |
189 | return DEBUG_LOC_BASE_ADDRESS; | |
190 | case DW_LLE_startx_length: | |
191 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
192 | if (loc_ptr == NULL) | |
193 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
194 | *low = dwarf2_read_addr_index (per_cu, u64); | |
195 | *high = *low; | |
196 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
197 | if (loc_ptr == NULL) | |
198 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
199 | *high += u64; | |
200 | *new_ptr = loc_ptr; | |
201 | return DEBUG_LOC_START_LENGTH; | |
202 | case DW_LLE_start_length: | |
203 | if (buf_end - loc_ptr < addr_size) | |
204 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
205 | if (signed_addr_p) | |
206 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
207 | else | |
208 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
209 | loc_ptr += addr_size; | |
210 | *high = *low; | |
211 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
212 | if (loc_ptr == NULL) | |
213 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
214 | *high += u64; | |
215 | *new_ptr = loc_ptr; | |
216 | return DEBUG_LOC_START_LENGTH; | |
43988095 JK |
217 | case DW_LLE_end_of_list: |
218 | *new_ptr = loc_ptr; | |
219 | return DEBUG_LOC_END_OF_LIST; | |
220 | case DW_LLE_base_address: | |
221 | if (loc_ptr + addr_size > buf_end) | |
222 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
223 | if (signed_addr_p) | |
224 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
225 | else | |
226 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
227 | loc_ptr += addr_size; | |
228 | *new_ptr = loc_ptr; | |
229 | return DEBUG_LOC_BASE_ADDRESS; | |
230 | case DW_LLE_offset_pair: | |
231 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
232 | if (loc_ptr == NULL) | |
233 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
234 | *low = u64; | |
235 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
236 | if (loc_ptr == NULL) | |
237 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
238 | *high = u64; | |
239 | *new_ptr = loc_ptr; | |
9fc3eaae | 240 | return DEBUG_LOC_OFFSET_PAIR; |
3112ed97 NA |
241 | /* Following cases are not supported yet. */ |
242 | case DW_LLE_startx_endx: | |
243 | case DW_LLE_start_end: | |
244 | case DW_LLE_default_location: | |
43988095 JK |
245 | default: |
246 | return DEBUG_LOC_INVALID_ENTRY; | |
247 | } | |
248 | } | |
249 | ||
f664829e DE |
250 | /* Decode the addresses in .debug_loc.dwo entry. |
251 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
252 | The encoded low,high addresses are return in *LOW,*HIGH. | |
253 | The result indicates the kind of entry found. */ | |
254 | ||
255 | static enum debug_loc_kind | |
256 | decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu, | |
257 | const gdb_byte *loc_ptr, | |
258 | const gdb_byte *buf_end, | |
259 | const gdb_byte **new_ptr, | |
3771a44c DE |
260 | CORE_ADDR *low, CORE_ADDR *high, |
261 | enum bfd_endian byte_order) | |
f664829e | 262 | { |
9fccedf7 | 263 | uint64_t low_index, high_index; |
f664829e DE |
264 | |
265 | if (loc_ptr == buf_end) | |
266 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
267 | ||
268 | switch (*loc_ptr++) | |
269 | { | |
43988095 | 270 | case DW_LLE_GNU_end_of_list_entry: |
f664829e DE |
271 | *new_ptr = loc_ptr; |
272 | return DEBUG_LOC_END_OF_LIST; | |
43988095 | 273 | case DW_LLE_GNU_base_address_selection_entry: |
f664829e DE |
274 | *low = 0; |
275 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
276 | if (loc_ptr == NULL) | |
277 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
278 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
279 | *new_ptr = loc_ptr; | |
280 | return DEBUG_LOC_BASE_ADDRESS; | |
43988095 | 281 | case DW_LLE_GNU_start_end_entry: |
f664829e DE |
282 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
283 | if (loc_ptr == NULL) | |
284 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
285 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
286 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
287 | if (loc_ptr == NULL) | |
288 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
289 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
290 | *new_ptr = loc_ptr; | |
3771a44c | 291 | return DEBUG_LOC_START_END; |
43988095 | 292 | case DW_LLE_GNU_start_length_entry: |
3771a44c DE |
293 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
294 | if (loc_ptr == NULL) | |
295 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
296 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
297 | if (loc_ptr + 4 > buf_end) | |
298 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
299 | *high = *low; | |
300 | *high += extract_unsigned_integer (loc_ptr, 4, byte_order); | |
301 | *new_ptr = loc_ptr + 4; | |
302 | return DEBUG_LOC_START_LENGTH; | |
f664829e DE |
303 | default: |
304 | return DEBUG_LOC_INVALID_ENTRY; | |
305 | } | |
306 | } | |
307 | ||
8cf6f0b1 | 308 | /* A function for dealing with location lists. Given a |
0d53c4c4 DJ |
309 | symbol baton (BATON) and a pc value (PC), find the appropriate |
310 | location expression, set *LOCEXPR_LENGTH, and return a pointer | |
311 | to the beginning of the expression. Returns NULL on failure. | |
312 | ||
313 | For now, only return the first matching location expression; there | |
314 | can be more than one in the list. */ | |
315 | ||
8cf6f0b1 TT |
316 | const gdb_byte * |
317 | dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton, | |
318 | size_t *locexpr_length, CORE_ADDR pc) | |
0d53c4c4 | 319 | { |
a50264ba TT |
320 | dwarf2_per_objfile *per_objfile = baton->per_objfile; |
321 | struct objfile *objfile = per_objfile->objfile; | |
08feed99 | 322 | struct gdbarch *gdbarch = objfile->arch (); |
e17a4113 | 323 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
09ba997f | 324 | unsigned int addr_size = baton->per_cu->addr_size (); |
d4a087c7 | 325 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
8edfa926 | 326 | /* Adjust base_address for relocatable objects. */ |
09ba997f | 327 | CORE_ADDR base_offset = baton->per_cu->text_offset (); |
8edfa926 | 328 | CORE_ADDR base_address = baton->base_address + base_offset; |
f664829e | 329 | const gdb_byte *loc_ptr, *buf_end; |
0d53c4c4 DJ |
330 | |
331 | loc_ptr = baton->data; | |
332 | buf_end = baton->data + baton->size; | |
333 | ||
334 | while (1) | |
335 | { | |
f664829e DE |
336 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
337 | int length; | |
338 | enum debug_loc_kind kind; | |
339 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
340 | ||
9fc3eaae | 341 | if (baton->per_cu->version () < 5 && baton->from_dwo) |
f664829e DE |
342 | kind = decode_debug_loc_dwo_addresses (baton->per_cu, |
343 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 344 | &low, &high, byte_order); |
09ba997f | 345 | else if (baton->per_cu->version () < 5) |
f664829e DE |
346 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
347 | &low, &high, | |
348 | byte_order, addr_size, | |
349 | signed_addr_p); | |
43988095 JK |
350 | else |
351 | kind = decode_debug_loclists_addresses (baton->per_cu, | |
352 | loc_ptr, buf_end, &new_ptr, | |
353 | &low, &high, byte_order, | |
354 | addr_size, signed_addr_p); | |
355 | ||
f664829e DE |
356 | loc_ptr = new_ptr; |
357 | switch (kind) | |
1d6edc3c | 358 | { |
f664829e | 359 | case DEBUG_LOC_END_OF_LIST: |
1d6edc3c JK |
360 | *locexpr_length = 0; |
361 | return NULL; | |
f664829e DE |
362 | case DEBUG_LOC_BASE_ADDRESS: |
363 | base_address = high + base_offset; | |
364 | continue; | |
3771a44c DE |
365 | case DEBUG_LOC_START_END: |
366 | case DEBUG_LOC_START_LENGTH: | |
9fc3eaae | 367 | case DEBUG_LOC_OFFSET_PAIR: |
f664829e DE |
368 | break; |
369 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
370 | case DEBUG_LOC_INVALID_ENTRY: | |
371 | error (_("dwarf2_find_location_expression: " | |
372 | "Corrupted DWARF expression.")); | |
373 | default: | |
374 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
1d6edc3c | 375 | } |
b5758fe4 | 376 | |
bed911e5 | 377 | /* Otherwise, a location expression entry. |
8ddd5a6c | 378 | If the entry is from a DWO, don't add base address: the entry is from |
9fc3eaae | 379 | .debug_addr which already has the DWARF "base address". We still add |
380 | base_offset in case we're debugging a PIE executable. However, if the | |
381 | entry is DW_LLE_offset_pair from a DWO, add the base address as the | |
382 | operands are offsets relative to the applicable base address. */ | |
383 | if (baton->from_dwo && kind != DEBUG_LOC_OFFSET_PAIR) | |
8ddd5a6c DE |
384 | { |
385 | low += base_offset; | |
386 | high += base_offset; | |
387 | } | |
388 | else | |
bed911e5 DE |
389 | { |
390 | low += base_address; | |
391 | high += base_address; | |
392 | } | |
0d53c4c4 | 393 | |
09ba997f | 394 | if (baton->per_cu->version () < 5) |
43988095 JK |
395 | { |
396 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); | |
397 | loc_ptr += 2; | |
398 | } | |
399 | else | |
400 | { | |
401 | unsigned int bytes_read; | |
402 | ||
403 | length = read_unsigned_leb128 (NULL, loc_ptr, &bytes_read); | |
404 | loc_ptr += bytes_read; | |
405 | } | |
0d53c4c4 | 406 | |
e18b2753 JK |
407 | if (low == high && pc == low) |
408 | { | |
409 | /* This is entry PC record present only at entry point | |
410 | of a function. Verify it is really the function entry point. */ | |
411 | ||
3977b71f | 412 | const struct block *pc_block = block_for_pc (pc); |
e18b2753 JK |
413 | struct symbol *pc_func = NULL; |
414 | ||
415 | if (pc_block) | |
416 | pc_func = block_linkage_function (pc_block); | |
417 | ||
2b1ffcfd | 418 | if (pc_func && pc == BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (pc_func))) |
e18b2753 JK |
419 | { |
420 | *locexpr_length = length; | |
421 | return loc_ptr; | |
422 | } | |
423 | } | |
424 | ||
0d53c4c4 DJ |
425 | if (pc >= low && pc < high) |
426 | { | |
427 | *locexpr_length = length; | |
428 | return loc_ptr; | |
429 | } | |
430 | ||
431 | loc_ptr += length; | |
432 | } | |
433 | } | |
434 | ||
f1e6e072 TT |
435 | /* Implement find_frame_base_location method for LOC_BLOCK functions using |
436 | DWARF expression for its DW_AT_frame_base. */ | |
437 | ||
438 | static void | |
439 | locexpr_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
440 | const gdb_byte **start, size_t *length) | |
441 | { | |
9a3c8263 SM |
442 | struct dwarf2_locexpr_baton *symbaton |
443 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
444 | |
445 | *length = symbaton->size; | |
446 | *start = symbaton->data; | |
447 | } | |
448 | ||
7d1c9c9b JB |
449 | /* Implement the struct symbol_block_ops::get_frame_base method for |
450 | LOC_BLOCK functions using a DWARF expression as its DW_AT_frame_base. */ | |
63e43d3a PMR |
451 | |
452 | static CORE_ADDR | |
7d1c9c9b | 453 | locexpr_get_frame_base (struct symbol *framefunc, struct frame_info *frame) |
63e43d3a PMR |
454 | { |
455 | struct gdbarch *gdbarch; | |
456 | struct type *type; | |
457 | struct dwarf2_locexpr_baton *dlbaton; | |
458 | const gdb_byte *start; | |
459 | size_t length; | |
460 | struct value *result; | |
461 | ||
462 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
463 | Thus, it's supposed to provide the find_frame_base_location method as | |
464 | well. */ | |
465 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
466 | ||
467 | gdbarch = get_frame_arch (frame); | |
468 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 469 | dlbaton = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); |
63e43d3a PMR |
470 | |
471 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
472 | (framefunc, get_frame_pc (frame), &start, &length); | |
473 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
474 | dlbaton->per_cu); | |
475 | ||
476 | /* The DW_AT_frame_base attribute contains a location description which | |
477 | computes the base address itself. However, the call to | |
478 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
479 | that address. The frame base address is thus this variable's | |
480 | address. */ | |
481 | return value_address (result); | |
482 | } | |
483 | ||
f1e6e072 TT |
484 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
485 | function uses DWARF expression for its DW_AT_frame_base. */ | |
486 | ||
487 | const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs = | |
488 | { | |
63e43d3a | 489 | locexpr_find_frame_base_location, |
7d1c9c9b | 490 | locexpr_get_frame_base |
f1e6e072 TT |
491 | }; |
492 | ||
493 | /* Implement find_frame_base_location method for LOC_BLOCK functions using | |
494 | DWARF location list for its DW_AT_frame_base. */ | |
495 | ||
496 | static void | |
497 | loclist_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
498 | const gdb_byte **start, size_t *length) | |
499 | { | |
9a3c8263 SM |
500 | struct dwarf2_loclist_baton *symbaton |
501 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
502 | |
503 | *start = dwarf2_find_location_expression (symbaton, length, pc); | |
504 | } | |
505 | ||
7d1c9c9b JB |
506 | /* Implement the struct symbol_block_ops::get_frame_base method for |
507 | LOC_BLOCK functions using a DWARF location list as its DW_AT_frame_base. */ | |
508 | ||
509 | static CORE_ADDR | |
510 | loclist_get_frame_base (struct symbol *framefunc, struct frame_info *frame) | |
511 | { | |
512 | struct gdbarch *gdbarch; | |
513 | struct type *type; | |
514 | struct dwarf2_loclist_baton *dlbaton; | |
515 | const gdb_byte *start; | |
516 | size_t length; | |
517 | struct value *result; | |
518 | ||
519 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
520 | Thus, it's supposed to provide the find_frame_base_location method as | |
521 | well. */ | |
522 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
523 | ||
524 | gdbarch = get_frame_arch (frame); | |
525 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 526 | dlbaton = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); |
7d1c9c9b JB |
527 | |
528 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
529 | (framefunc, get_frame_pc (frame), &start, &length); | |
530 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
531 | dlbaton->per_cu); | |
532 | ||
533 | /* The DW_AT_frame_base attribute contains a location description which | |
534 | computes the base address itself. However, the call to | |
535 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
536 | that address. The frame base address is thus this variable's | |
537 | address. */ | |
538 | return value_address (result); | |
539 | } | |
540 | ||
f1e6e072 TT |
541 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
542 | function uses DWARF location list for its DW_AT_frame_base. */ | |
543 | ||
544 | const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs = | |
545 | { | |
63e43d3a | 546 | loclist_find_frame_base_location, |
7d1c9c9b | 547 | loclist_get_frame_base |
f1e6e072 TT |
548 | }; |
549 | ||
af945b75 TT |
550 | /* See dwarf2loc.h. */ |
551 | ||
552 | void | |
553 | func_get_frame_base_dwarf_block (struct symbol *framefunc, CORE_ADDR pc, | |
554 | const gdb_byte **start, size_t *length) | |
0936ad1d | 555 | { |
f1e6e072 | 556 | if (SYMBOL_BLOCK_OPS (framefunc) != NULL) |
0d53c4c4 | 557 | { |
f1e6e072 | 558 | const struct symbol_block_ops *ops_block = SYMBOL_BLOCK_OPS (framefunc); |
22c6caba | 559 | |
f1e6e072 | 560 | ops_block->find_frame_base_location (framefunc, pc, start, length); |
0d53c4c4 DJ |
561 | } |
562 | else | |
f1e6e072 | 563 | *length = 0; |
0d53c4c4 | 564 | |
1d6edc3c | 565 | if (*length == 0) |
8a3fe4f8 | 566 | error (_("Could not find the frame base for \"%s\"."), |
987012b8 | 567 | framefunc->natural_name ()); |
4c2df51b DJ |
568 | } |
569 | ||
4c2df51b | 570 | static CORE_ADDR |
192ca6d8 | 571 | get_frame_pc_for_per_cu_dwarf_call (void *baton) |
4c2df51b | 572 | { |
192ca6d8 | 573 | dwarf_expr_context *ctx = (dwarf_expr_context *) baton; |
4c2df51b | 574 | |
192ca6d8 | 575 | return ctx->get_frame_pc (); |
4c2df51b DJ |
576 | } |
577 | ||
5c631832 | 578 | static void |
b64f50a1 | 579 | per_cu_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset, |
192ca6d8 | 580 | struct dwarf2_per_cu_data *per_cu) |
5c631832 JK |
581 | { |
582 | struct dwarf2_locexpr_baton block; | |
583 | ||
192ca6d8 TT |
584 | block = dwarf2_fetch_die_loc_cu_off (die_offset, per_cu, |
585 | get_frame_pc_for_per_cu_dwarf_call, | |
586 | ctx); | |
5c631832 JK |
587 | |
588 | /* DW_OP_call_ref is currently not supported. */ | |
589 | gdb_assert (block.per_cu == per_cu); | |
590 | ||
595d2e30 | 591 | ctx->eval (block.data, block.size); |
5c631832 JK |
592 | } |
593 | ||
a6b786da KB |
594 | /* Given context CTX, section offset SECT_OFF, and compilation unit |
595 | data PER_CU, execute the "variable value" operation on the DIE | |
596 | found at SECT_OFF. */ | |
597 | ||
598 | static struct value * | |
599 | sect_variable_value (struct dwarf_expr_context *ctx, sect_offset sect_off, | |
600 | struct dwarf2_per_cu_data *per_cu) | |
601 | { | |
602 | struct type *die_type = dwarf2_fetch_die_type_sect_off (sect_off, per_cu); | |
603 | ||
604 | if (die_type == NULL) | |
605 | error (_("Bad DW_OP_GNU_variable_value DIE.")); | |
606 | ||
607 | /* Note: Things still work when the following test is removed. This | |
608 | test and error is here to conform to the proposed specification. */ | |
78134374 SM |
609 | if (die_type->code () != TYPE_CODE_INT |
610 | && die_type->code () != TYPE_CODE_PTR) | |
a6b786da KB |
611 | error (_("Type of DW_OP_GNU_variable_value DIE must be an integer or pointer.")); |
612 | ||
613 | struct type *type = lookup_pointer_type (die_type); | |
614 | struct frame_info *frame = get_selected_frame (_("No frame selected.")); | |
e4a62c65 | 615 | return indirect_synthetic_pointer (sect_off, 0, per_cu, frame, type, true); |
a6b786da KB |
616 | } |
617 | ||
192ca6d8 | 618 | class dwarf_evaluate_loc_desc : public dwarf_expr_context |
5c631832 | 619 | { |
89b07335 SM |
620 | public: |
621 | dwarf_evaluate_loc_desc (dwarf2_per_objfile *per_objfile) | |
622 | : dwarf_expr_context (per_objfile) | |
623 | {} | |
5c631832 | 624 | |
192ca6d8 TT |
625 | struct frame_info *frame; |
626 | struct dwarf2_per_cu_data *per_cu; | |
627 | CORE_ADDR obj_address; | |
5c631832 | 628 | |
192ca6d8 TT |
629 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for |
630 | the frame in BATON. */ | |
8a9b8146 | 631 | |
632e107b | 632 | CORE_ADDR get_frame_cfa () override |
192ca6d8 TT |
633 | { |
634 | return dwarf2_frame_cfa (frame); | |
635 | } | |
8a9b8146 | 636 | |
192ca6d8 TT |
637 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for |
638 | the frame in BATON. */ | |
639 | ||
632e107b | 640 | CORE_ADDR get_frame_pc () override |
192ca6d8 TT |
641 | { |
642 | return get_frame_address_in_block (frame); | |
643 | } | |
644 | ||
645 | /* Using the objfile specified in BATON, find the address for the | |
646 | current thread's thread-local storage with offset OFFSET. */ | |
632e107b | 647 | CORE_ADDR get_tls_address (CORE_ADDR offset) override |
192ca6d8 | 648 | { |
09ba997f | 649 | struct objfile *objfile = per_cu->objfile (); |
192ca6d8 TT |
650 | |
651 | return target_translate_tls_address (objfile, offset); | |
652 | } | |
653 | ||
654 | /* Helper interface of per_cu_dwarf_call for | |
655 | dwarf2_evaluate_loc_desc. */ | |
656 | ||
632e107b | 657 | void dwarf_call (cu_offset die_offset) override |
192ca6d8 TT |
658 | { |
659 | per_cu_dwarf_call (this, die_offset, per_cu); | |
660 | } | |
661 | ||
a6b786da KB |
662 | /* Helper interface of sect_variable_value for |
663 | dwarf2_evaluate_loc_desc. */ | |
664 | ||
665 | struct value *dwarf_variable_value (sect_offset sect_off) override | |
666 | { | |
667 | return sect_variable_value (this, sect_off, per_cu); | |
668 | } | |
669 | ||
632e107b | 670 | struct type *get_base_type (cu_offset die_offset, int size) override |
192ca6d8 | 671 | { |
7d5697f9 TT |
672 | struct type *result = dwarf2_get_die_type (die_offset, per_cu); |
673 | if (result == NULL) | |
216f72a1 | 674 | error (_("Could not find type for DW_OP_const_type")); |
7d5697f9 | 675 | if (size != 0 && TYPE_LENGTH (result) != size) |
216f72a1 | 676 | error (_("DW_OP_const_type has different sizes for type and data")); |
7d5697f9 | 677 | return result; |
192ca6d8 TT |
678 | } |
679 | ||
680 | /* Callback function for dwarf2_evaluate_loc_desc. | |
336d760d | 681 | Fetch the address indexed by DW_OP_addrx or DW_OP_GNU_addr_index. */ |
192ca6d8 | 682 | |
632e107b | 683 | CORE_ADDR get_addr_index (unsigned int index) override |
192ca6d8 TT |
684 | { |
685 | return dwarf2_read_addr_index (per_cu, index); | |
686 | } | |
687 | ||
688 | /* Callback function for get_object_address. Return the address of the VLA | |
689 | object. */ | |
690 | ||
632e107b | 691 | CORE_ADDR get_object_address () override |
192ca6d8 TT |
692 | { |
693 | if (obj_address == 0) | |
694 | error (_("Location address is not set.")); | |
695 | return obj_address; | |
696 | } | |
697 | ||
698 | /* Execute DWARF block of call_site_parameter which matches KIND and | |
699 | KIND_U. Choose DEREF_SIZE value of that parameter. Search | |
700 | caller of this objects's frame. | |
701 | ||
702 | The caller can be from a different CU - per_cu_dwarf_call | |
703 | implementation can be more simple as it does not support cross-CU | |
704 | DWARF executions. */ | |
705 | ||
706 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
707 | union call_site_parameter_u kind_u, | |
632e107b | 708 | int deref_size) override |
192ca6d8 TT |
709 | { |
710 | struct frame_info *caller_frame; | |
711 | struct dwarf2_per_cu_data *caller_per_cu; | |
192ca6d8 TT |
712 | struct call_site_parameter *parameter; |
713 | const gdb_byte *data_src; | |
714 | size_t size; | |
715 | ||
716 | caller_frame = get_prev_frame (frame); | |
717 | ||
718 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, | |
719 | &caller_per_cu); | |
720 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
721 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
722 | ||
723 | /* DEREF_SIZE size is not verified here. */ | |
724 | if (data_src == NULL) | |
725 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 726 | _("Cannot resolve DW_AT_call_data_value")); |
192ca6d8 | 727 | |
7d5697f9 TT |
728 | scoped_restore save_frame = make_scoped_restore (&this->frame, |
729 | caller_frame); | |
730 | scoped_restore save_per_cu = make_scoped_restore (&this->per_cu, | |
731 | caller_per_cu); | |
732 | scoped_restore save_obj_addr = make_scoped_restore (&this->obj_address, | |
733 | (CORE_ADDR) 0); | |
192ca6d8 TT |
734 | |
735 | scoped_restore save_arch = make_scoped_restore (&this->gdbarch); | |
08feed99 | 736 | this->gdbarch = per_cu->objfile ()->arch (); |
192ca6d8 | 737 | scoped_restore save_addr_size = make_scoped_restore (&this->addr_size); |
09ba997f | 738 | this->addr_size = per_cu->addr_size (); |
192ca6d8 TT |
739 | |
740 | this->eval (data_src, size); | |
741 | } | |
742 | ||
743 | /* Using the frame specified in BATON, find the location expression | |
744 | describing the frame base. Return a pointer to it in START and | |
745 | its length in LENGTH. */ | |
632e107b | 746 | void get_frame_base (const gdb_byte **start, size_t * length) override |
192ca6d8 TT |
747 | { |
748 | /* FIXME: cagney/2003-03-26: This code should be using | |
749 | get_frame_base_address(), and then implement a dwarf2 specific | |
750 | this_base method. */ | |
751 | struct symbol *framefunc; | |
752 | const struct block *bl = get_frame_block (frame, NULL); | |
753 | ||
754 | if (bl == NULL) | |
755 | error (_("frame address is not available.")); | |
756 | ||
757 | /* Use block_linkage_function, which returns a real (not inlined) | |
758 | function, instead of get_frame_function, which may return an | |
759 | inlined function. */ | |
760 | framefunc = block_linkage_function (bl); | |
761 | ||
762 | /* If we found a frame-relative symbol then it was certainly within | |
763 | some function associated with a frame. If we can't find the frame, | |
764 | something has gone wrong. */ | |
765 | gdb_assert (framefunc != NULL); | |
766 | ||
767 | func_get_frame_base_dwarf_block (framefunc, | |
768 | get_frame_address_in_block (frame), | |
769 | start, length); | |
770 | } | |
771 | ||
772 | /* Read memory at ADDR (length LEN) into BUF. */ | |
773 | ||
632e107b | 774 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override |
192ca6d8 TT |
775 | { |
776 | read_memory (addr, buf, len); | |
777 | } | |
778 | ||
779 | /* Using the frame specified in BATON, return the value of register | |
780 | REGNUM, treated as a pointer. */ | |
632e107b | 781 | CORE_ADDR read_addr_from_reg (int dwarf_regnum) override |
192ca6d8 TT |
782 | { |
783 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
784 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); | |
785 | ||
786 | return address_from_register (regnum, frame); | |
787 | } | |
788 | ||
789 | /* Implement "get_reg_value" callback. */ | |
790 | ||
632e107b | 791 | struct value *get_reg_value (struct type *type, int dwarf_regnum) override |
192ca6d8 TT |
792 | { |
793 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
794 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); | |
795 | ||
796 | return value_from_register (type, regnum, frame); | |
797 | } | |
798 | }; | |
8a9b8146 | 799 | |
8e3b41a9 JK |
800 | /* See dwarf2loc.h. */ |
801 | ||
ccce17b0 | 802 | unsigned int entry_values_debug = 0; |
8e3b41a9 JK |
803 | |
804 | /* Helper to set entry_values_debug. */ | |
805 | ||
806 | static void | |
807 | show_entry_values_debug (struct ui_file *file, int from_tty, | |
808 | struct cmd_list_element *c, const char *value) | |
809 | { | |
810 | fprintf_filtered (file, | |
811 | _("Entry values and tail call frames debugging is %s.\n"), | |
812 | value); | |
813 | } | |
814 | ||
216f72a1 | 815 | /* Find DW_TAG_call_site's DW_AT_call_target address. |
8e3b41a9 JK |
816 | CALLER_FRAME (for registers) can be NULL if it is not known. This function |
817 | always returns valid address or it throws NO_ENTRY_VALUE_ERROR. */ | |
818 | ||
819 | static CORE_ADDR | |
820 | call_site_to_target_addr (struct gdbarch *call_site_gdbarch, | |
821 | struct call_site *call_site, | |
822 | struct frame_info *caller_frame) | |
823 | { | |
824 | switch (FIELD_LOC_KIND (call_site->target)) | |
825 | { | |
826 | case FIELD_LOC_KIND_DWARF_BLOCK: | |
827 | { | |
828 | struct dwarf2_locexpr_baton *dwarf_block; | |
829 | struct value *val; | |
830 | struct type *caller_core_addr_type; | |
831 | struct gdbarch *caller_arch; | |
832 | ||
833 | dwarf_block = FIELD_DWARF_BLOCK (call_site->target); | |
834 | if (dwarf_block == NULL) | |
835 | { | |
7cbd4a93 | 836 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
837 | |
838 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
839 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 840 | _("DW_AT_call_target is not specified at %s in %s"), |
8e3b41a9 | 841 | paddress (call_site_gdbarch, call_site->pc), |
7cbd4a93 | 842 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 843 | : msym.minsym->print_name ())); |
8e3b41a9 JK |
844 | |
845 | } | |
846 | if (caller_frame == NULL) | |
847 | { | |
7cbd4a93 | 848 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
849 | |
850 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
851 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 852 | _("DW_AT_call_target DWARF block resolving " |
8e3b41a9 JK |
853 | "requires known frame which is currently not " |
854 | "available at %s in %s"), | |
855 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 | 856 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 857 | : msym.minsym->print_name ())); |
8e3b41a9 JK |
858 | |
859 | } | |
860 | caller_arch = get_frame_arch (caller_frame); | |
861 | caller_core_addr_type = builtin_type (caller_arch)->builtin_func_ptr; | |
862 | val = dwarf2_evaluate_loc_desc (caller_core_addr_type, caller_frame, | |
863 | dwarf_block->data, dwarf_block->size, | |
864 | dwarf_block->per_cu); | |
216f72a1 | 865 | /* DW_AT_call_target is a DWARF expression, not a DWARF location. */ |
8e3b41a9 JK |
866 | if (VALUE_LVAL (val) == lval_memory) |
867 | return value_address (val); | |
868 | else | |
869 | return value_as_address (val); | |
870 | } | |
871 | ||
872 | case FIELD_LOC_KIND_PHYSNAME: | |
873 | { | |
874 | const char *physname; | |
3b7344d5 | 875 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
876 | |
877 | physname = FIELD_STATIC_PHYSNAME (call_site->target); | |
9112db09 JK |
878 | |
879 | /* Handle both the mangled and demangled PHYSNAME. */ | |
880 | msym = lookup_minimal_symbol (physname, NULL, NULL); | |
3b7344d5 | 881 | if (msym.minsym == NULL) |
8e3b41a9 | 882 | { |
3b7344d5 | 883 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); |
8e3b41a9 JK |
884 | throw_error (NO_ENTRY_VALUE_ERROR, |
885 | _("Cannot find function \"%s\" for a call site target " | |
886 | "at %s in %s"), | |
887 | physname, paddress (call_site_gdbarch, call_site->pc), | |
3b7344d5 | 888 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 889 | : msym.minsym->print_name ())); |
8e3b41a9 JK |
890 | |
891 | } | |
77e371c0 | 892 | return BMSYMBOL_VALUE_ADDRESS (msym); |
8e3b41a9 JK |
893 | } |
894 | ||
895 | case FIELD_LOC_KIND_PHYSADDR: | |
896 | return FIELD_STATIC_PHYSADDR (call_site->target); | |
897 | ||
898 | default: | |
899 | internal_error (__FILE__, __LINE__, _("invalid call site target kind")); | |
900 | } | |
901 | } | |
902 | ||
111c6489 JK |
903 | /* Convert function entry point exact address ADDR to the function which is |
904 | compliant with TAIL_CALL_LIST_COMPLETE condition. Throw | |
905 | NO_ENTRY_VALUE_ERROR otherwise. */ | |
906 | ||
907 | static struct symbol * | |
908 | func_addr_to_tail_call_list (struct gdbarch *gdbarch, CORE_ADDR addr) | |
909 | { | |
910 | struct symbol *sym = find_pc_function (addr); | |
911 | struct type *type; | |
912 | ||
2b1ffcfd | 913 | if (sym == NULL || BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (sym)) != addr) |
111c6489 | 914 | throw_error (NO_ENTRY_VALUE_ERROR, |
216f72a1 | 915 | _("DW_TAG_call_site resolving failed to find function " |
111c6489 JK |
916 | "name for address %s"), |
917 | paddress (gdbarch, addr)); | |
918 | ||
919 | type = SYMBOL_TYPE (sym); | |
78134374 | 920 | gdb_assert (type->code () == TYPE_CODE_FUNC); |
111c6489 JK |
921 | gdb_assert (TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_FUNC); |
922 | ||
923 | return sym; | |
924 | } | |
925 | ||
2d6c5dc2 JK |
926 | /* Verify function with entry point exact address ADDR can never call itself |
927 | via its tail calls (incl. transitively). Throw NO_ENTRY_VALUE_ERROR if it | |
928 | can call itself via tail calls. | |
929 | ||
930 | If a funtion can tail call itself its entry value based parameters are | |
931 | unreliable. There is no verification whether the value of some/all | |
932 | parameters is unchanged through the self tail call, we expect if there is | |
933 | a self tail call all the parameters can be modified. */ | |
934 | ||
935 | static void | |
936 | func_verify_no_selftailcall (struct gdbarch *gdbarch, CORE_ADDR verify_addr) | |
937 | { | |
2d6c5dc2 JK |
938 | CORE_ADDR addr; |
939 | ||
2d6c5dc2 JK |
940 | /* The verification is completely unordered. Track here function addresses |
941 | which still need to be iterated. */ | |
fc4007c9 | 942 | std::vector<CORE_ADDR> todo; |
2d6c5dc2 | 943 | |
fc4007c9 TT |
944 | /* Track here CORE_ADDRs which were already visited. */ |
945 | std::unordered_set<CORE_ADDR> addr_hash; | |
2d6c5dc2 | 946 | |
fc4007c9 TT |
947 | todo.push_back (verify_addr); |
948 | while (!todo.empty ()) | |
2d6c5dc2 JK |
949 | { |
950 | struct symbol *func_sym; | |
951 | struct call_site *call_site; | |
952 | ||
fc4007c9 TT |
953 | addr = todo.back (); |
954 | todo.pop_back (); | |
2d6c5dc2 JK |
955 | |
956 | func_sym = func_addr_to_tail_call_list (gdbarch, addr); | |
957 | ||
958 | for (call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (func_sym)); | |
959 | call_site; call_site = call_site->tail_call_next) | |
960 | { | |
961 | CORE_ADDR target_addr; | |
2d6c5dc2 JK |
962 | |
963 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
964 | frames. */ | |
965 | target_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
966 | ||
967 | if (target_addr == verify_addr) | |
968 | { | |
7cbd4a93 | 969 | struct bound_minimal_symbol msym; |
2d6c5dc2 JK |
970 | |
971 | msym = lookup_minimal_symbol_by_pc (verify_addr); | |
972 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 973 | _("DW_OP_entry_value resolving has found " |
2d6c5dc2 JK |
974 | "function \"%s\" at %s can call itself via tail " |
975 | "calls"), | |
7cbd4a93 | 976 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 977 | : msym.minsym->print_name ()), |
2d6c5dc2 JK |
978 | paddress (gdbarch, verify_addr)); |
979 | } | |
980 | ||
fc4007c9 TT |
981 | if (addr_hash.insert (target_addr).second) |
982 | todo.push_back (target_addr); | |
2d6c5dc2 JK |
983 | } |
984 | } | |
2d6c5dc2 JK |
985 | } |
986 | ||
111c6489 JK |
987 | /* Print user readable form of CALL_SITE->PC to gdb_stdlog. Used only for |
988 | ENTRY_VALUES_DEBUG. */ | |
989 | ||
990 | static void | |
991 | tailcall_dump (struct gdbarch *gdbarch, const struct call_site *call_site) | |
992 | { | |
993 | CORE_ADDR addr = call_site->pc; | |
7cbd4a93 | 994 | struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (addr - 1); |
111c6489 JK |
995 | |
996 | fprintf_unfiltered (gdb_stdlog, " %s(%s)", paddress (gdbarch, addr), | |
7cbd4a93 | 997 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 998 | : msym.minsym->print_name ())); |
111c6489 JK |
999 | |
1000 | } | |
1001 | ||
111c6489 JK |
1002 | /* Intersect RESULTP with CHAIN to keep RESULTP unambiguous, keep in RESULTP |
1003 | only top callers and bottom callees which are present in both. GDBARCH is | |
1004 | used only for ENTRY_VALUES_DEBUG. RESULTP is NULL after return if there are | |
1005 | no remaining possibilities to provide unambiguous non-trivial result. | |
1006 | RESULTP should point to NULL on the first (initialization) call. Caller is | |
1007 | responsible for xfree of any RESULTP data. */ | |
1008 | ||
1009 | static void | |
fc4007c9 TT |
1010 | chain_candidate (struct gdbarch *gdbarch, |
1011 | gdb::unique_xmalloc_ptr<struct call_site_chain> *resultp, | |
1012 | std::vector<struct call_site *> *chain) | |
111c6489 | 1013 | { |
fc4007c9 | 1014 | long length = chain->size (); |
111c6489 JK |
1015 | int callers, callees, idx; |
1016 | ||
fc4007c9 | 1017 | if (*resultp == NULL) |
111c6489 JK |
1018 | { |
1019 | /* Create the initial chain containing all the passed PCs. */ | |
1020 | ||
fc4007c9 TT |
1021 | struct call_site_chain *result |
1022 | = ((struct call_site_chain *) | |
1023 | xmalloc (sizeof (*result) | |
1024 | + sizeof (*result->call_site) * (length - 1))); | |
111c6489 JK |
1025 | result->length = length; |
1026 | result->callers = result->callees = length; | |
fc4007c9 TT |
1027 | if (!chain->empty ()) |
1028 | memcpy (result->call_site, chain->data (), | |
19a1b230 | 1029 | sizeof (*result->call_site) * length); |
fc4007c9 | 1030 | resultp->reset (result); |
111c6489 JK |
1031 | |
1032 | if (entry_values_debug) | |
1033 | { | |
1034 | fprintf_unfiltered (gdb_stdlog, "tailcall: initial:"); | |
1035 | for (idx = 0; idx < length; idx++) | |
1036 | tailcall_dump (gdbarch, result->call_site[idx]); | |
1037 | fputc_unfiltered ('\n', gdb_stdlog); | |
1038 | } | |
1039 | ||
1040 | return; | |
1041 | } | |
1042 | ||
1043 | if (entry_values_debug) | |
1044 | { | |
1045 | fprintf_unfiltered (gdb_stdlog, "tailcall: compare:"); | |
1046 | for (idx = 0; idx < length; idx++) | |
fc4007c9 | 1047 | tailcall_dump (gdbarch, chain->at (idx)); |
111c6489 JK |
1048 | fputc_unfiltered ('\n', gdb_stdlog); |
1049 | } | |
1050 | ||
1051 | /* Intersect callers. */ | |
1052 | ||
fc4007c9 | 1053 | callers = std::min ((long) (*resultp)->callers, length); |
111c6489 | 1054 | for (idx = 0; idx < callers; idx++) |
fc4007c9 | 1055 | if ((*resultp)->call_site[idx] != chain->at (idx)) |
111c6489 | 1056 | { |
fc4007c9 | 1057 | (*resultp)->callers = idx; |
111c6489 JK |
1058 | break; |
1059 | } | |
1060 | ||
1061 | /* Intersect callees. */ | |
1062 | ||
fc4007c9 | 1063 | callees = std::min ((long) (*resultp)->callees, length); |
111c6489 | 1064 | for (idx = 0; idx < callees; idx++) |
fc4007c9 TT |
1065 | if ((*resultp)->call_site[(*resultp)->length - 1 - idx] |
1066 | != chain->at (length - 1 - idx)) | |
111c6489 | 1067 | { |
fc4007c9 | 1068 | (*resultp)->callees = idx; |
111c6489 JK |
1069 | break; |
1070 | } | |
1071 | ||
1072 | if (entry_values_debug) | |
1073 | { | |
1074 | fprintf_unfiltered (gdb_stdlog, "tailcall: reduced:"); | |
fc4007c9 TT |
1075 | for (idx = 0; idx < (*resultp)->callers; idx++) |
1076 | tailcall_dump (gdbarch, (*resultp)->call_site[idx]); | |
111c6489 | 1077 | fputs_unfiltered (" |", gdb_stdlog); |
fc4007c9 TT |
1078 | for (idx = 0; idx < (*resultp)->callees; idx++) |
1079 | tailcall_dump (gdbarch, | |
1080 | (*resultp)->call_site[(*resultp)->length | |
1081 | - (*resultp)->callees + idx]); | |
111c6489 JK |
1082 | fputc_unfiltered ('\n', gdb_stdlog); |
1083 | } | |
1084 | ||
fc4007c9 | 1085 | if ((*resultp)->callers == 0 && (*resultp)->callees == 0) |
111c6489 JK |
1086 | { |
1087 | /* There are no common callers or callees. It could be also a direct | |
1088 | call (which has length 0) with ambiguous possibility of an indirect | |
1089 | call - CALLERS == CALLEES == 0 is valid during the first allocation | |
1090 | but any subsequence processing of such entry means ambiguity. */ | |
fc4007c9 | 1091 | resultp->reset (NULL); |
111c6489 JK |
1092 | return; |
1093 | } | |
1094 | ||
1095 | /* See call_site_find_chain_1 why there is no way to reach the bottom callee | |
1096 | PC again. In such case there must be two different code paths to reach | |
e0619de6 | 1097 | it. CALLERS + CALLEES equal to LENGTH in the case of self tail-call. */ |
fc4007c9 | 1098 | gdb_assert ((*resultp)->callers + (*resultp)->callees <= (*resultp)->length); |
111c6489 JK |
1099 | } |
1100 | ||
1101 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1102 | assumed frames between them use GDBARCH. Use depth first search so we can | |
1103 | keep single CHAIN of call_site's back to CALLER_PC. Function recursion | |
8084e579 TT |
1104 | would have needless GDB stack overhead. Any unreliability results |
1105 | in thrown NO_ENTRY_VALUE_ERROR. */ | |
111c6489 | 1106 | |
8084e579 | 1107 | static gdb::unique_xmalloc_ptr<call_site_chain> |
111c6489 JK |
1108 | call_site_find_chain_1 (struct gdbarch *gdbarch, CORE_ADDR caller_pc, |
1109 | CORE_ADDR callee_pc) | |
1110 | { | |
c4be5165 | 1111 | CORE_ADDR save_callee_pc = callee_pc; |
fc4007c9 | 1112 | gdb::unique_xmalloc_ptr<struct call_site_chain> retval; |
111c6489 JK |
1113 | struct call_site *call_site; |
1114 | ||
111c6489 JK |
1115 | /* CHAIN contains only the intermediate CALL_SITEs. Neither CALLER_PC's |
1116 | call_site nor any possible call_site at CALLEE_PC's function is there. | |
1117 | Any CALL_SITE in CHAIN will be iterated to its siblings - via | |
1118 | TAIL_CALL_NEXT. This is inappropriate for CALLER_PC's call_site. */ | |
fc4007c9 | 1119 | std::vector<struct call_site *> chain; |
111c6489 JK |
1120 | |
1121 | /* We are not interested in the specific PC inside the callee function. */ | |
1122 | callee_pc = get_pc_function_start (callee_pc); | |
1123 | if (callee_pc == 0) | |
1124 | throw_error (NO_ENTRY_VALUE_ERROR, _("Unable to find function for PC %s"), | |
c4be5165 | 1125 | paddress (gdbarch, save_callee_pc)); |
111c6489 | 1126 | |
fc4007c9 TT |
1127 | /* Mark CALL_SITEs so we do not visit the same ones twice. */ |
1128 | std::unordered_set<CORE_ADDR> addr_hash; | |
111c6489 JK |
1129 | |
1130 | /* Do not push CALL_SITE to CHAIN. Push there only the first tail call site | |
1131 | at the target's function. All the possible tail call sites in the | |
1132 | target's function will get iterated as already pushed into CHAIN via their | |
1133 | TAIL_CALL_NEXT. */ | |
1134 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1135 | ||
1136 | while (call_site) | |
1137 | { | |
1138 | CORE_ADDR target_func_addr; | |
1139 | struct call_site *target_call_site; | |
1140 | ||
1141 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
1142 | frames. */ | |
1143 | target_func_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
1144 | ||
1145 | if (target_func_addr == callee_pc) | |
1146 | { | |
fc4007c9 | 1147 | chain_candidate (gdbarch, &retval, &chain); |
111c6489 JK |
1148 | if (retval == NULL) |
1149 | break; | |
1150 | ||
1151 | /* There is no way to reach CALLEE_PC again as we would prevent | |
1152 | entering it twice as being already marked in ADDR_HASH. */ | |
1153 | target_call_site = NULL; | |
1154 | } | |
1155 | else | |
1156 | { | |
1157 | struct symbol *target_func; | |
1158 | ||
1159 | target_func = func_addr_to_tail_call_list (gdbarch, target_func_addr); | |
1160 | target_call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (target_func)); | |
1161 | } | |
1162 | ||
1163 | do | |
1164 | { | |
1165 | /* Attempt to visit TARGET_CALL_SITE. */ | |
1166 | ||
1167 | if (target_call_site) | |
1168 | { | |
fc4007c9 | 1169 | if (addr_hash.insert (target_call_site->pc).second) |
111c6489 JK |
1170 | { |
1171 | /* Successfully entered TARGET_CALL_SITE. */ | |
1172 | ||
fc4007c9 | 1173 | chain.push_back (target_call_site); |
111c6489 JK |
1174 | break; |
1175 | } | |
1176 | } | |
1177 | ||
1178 | /* Backtrack (without revisiting the originating call_site). Try the | |
1179 | callers's sibling; if there isn't any try the callers's callers's | |
1180 | sibling etc. */ | |
1181 | ||
1182 | target_call_site = NULL; | |
fc4007c9 | 1183 | while (!chain.empty ()) |
111c6489 | 1184 | { |
fc4007c9 TT |
1185 | call_site = chain.back (); |
1186 | chain.pop_back (); | |
111c6489 | 1187 | |
fc4007c9 TT |
1188 | size_t removed = addr_hash.erase (call_site->pc); |
1189 | gdb_assert (removed == 1); | |
111c6489 JK |
1190 | |
1191 | target_call_site = call_site->tail_call_next; | |
1192 | if (target_call_site) | |
1193 | break; | |
1194 | } | |
1195 | } | |
1196 | while (target_call_site); | |
1197 | ||
fc4007c9 | 1198 | if (chain.empty ()) |
111c6489 JK |
1199 | call_site = NULL; |
1200 | else | |
fc4007c9 | 1201 | call_site = chain.back (); |
111c6489 JK |
1202 | } |
1203 | ||
1204 | if (retval == NULL) | |
1205 | { | |
7cbd4a93 | 1206 | struct bound_minimal_symbol msym_caller, msym_callee; |
111c6489 JK |
1207 | |
1208 | msym_caller = lookup_minimal_symbol_by_pc (caller_pc); | |
1209 | msym_callee = lookup_minimal_symbol_by_pc (callee_pc); | |
1210 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1211 | _("There are no unambiguously determinable intermediate " | |
1212 | "callers or callees between caller function \"%s\" at %s " | |
1213 | "and callee function \"%s\" at %s"), | |
7cbd4a93 | 1214 | (msym_caller.minsym == NULL |
c9d95fa3 | 1215 | ? "???" : msym_caller.minsym->print_name ()), |
111c6489 | 1216 | paddress (gdbarch, caller_pc), |
7cbd4a93 | 1217 | (msym_callee.minsym == NULL |
c9d95fa3 | 1218 | ? "???" : msym_callee.minsym->print_name ()), |
111c6489 JK |
1219 | paddress (gdbarch, callee_pc)); |
1220 | } | |
1221 | ||
8084e579 | 1222 | return retval; |
111c6489 JK |
1223 | } |
1224 | ||
1225 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1226 | assumed frames between them use GDBARCH. If valid call_site_chain cannot be | |
8084e579 | 1227 | constructed return NULL. */ |
111c6489 | 1228 | |
8084e579 | 1229 | gdb::unique_xmalloc_ptr<call_site_chain> |
111c6489 JK |
1230 | call_site_find_chain (struct gdbarch *gdbarch, CORE_ADDR caller_pc, |
1231 | CORE_ADDR callee_pc) | |
1232 | { | |
8084e579 | 1233 | gdb::unique_xmalloc_ptr<call_site_chain> retval; |
111c6489 | 1234 | |
a70b8144 | 1235 | try |
111c6489 JK |
1236 | { |
1237 | retval = call_site_find_chain_1 (gdbarch, caller_pc, callee_pc); | |
1238 | } | |
230d2906 | 1239 | catch (const gdb_exception_error &e) |
111c6489 JK |
1240 | { |
1241 | if (e.error == NO_ENTRY_VALUE_ERROR) | |
1242 | { | |
1243 | if (entry_values_debug) | |
1244 | exception_print (gdb_stdout, e); | |
1245 | ||
1246 | return NULL; | |
1247 | } | |
1248 | else | |
eedc3f4f | 1249 | throw; |
111c6489 | 1250 | } |
492d29ea | 1251 | |
111c6489 JK |
1252 | return retval; |
1253 | } | |
1254 | ||
24c5c679 JK |
1255 | /* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */ |
1256 | ||
1257 | static int | |
1258 | call_site_parameter_matches (struct call_site_parameter *parameter, | |
1259 | enum call_site_parameter_kind kind, | |
1260 | union call_site_parameter_u kind_u) | |
1261 | { | |
1262 | if (kind == parameter->kind) | |
1263 | switch (kind) | |
1264 | { | |
1265 | case CALL_SITE_PARAMETER_DWARF_REG: | |
1266 | return kind_u.dwarf_reg == parameter->u.dwarf_reg; | |
1267 | case CALL_SITE_PARAMETER_FB_OFFSET: | |
1268 | return kind_u.fb_offset == parameter->u.fb_offset; | |
1788b2d3 | 1269 | case CALL_SITE_PARAMETER_PARAM_OFFSET: |
9c541725 | 1270 | return kind_u.param_cu_off == parameter->u.param_cu_off; |
24c5c679 JK |
1271 | } |
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | /* Fetch call_site_parameter from caller matching KIND and KIND_U. | |
1276 | FRAME is for callee. | |
8e3b41a9 JK |
1277 | |
1278 | Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR | |
1279 | otherwise. */ | |
1280 | ||
1281 | static struct call_site_parameter * | |
24c5c679 JK |
1282 | dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, |
1283 | enum call_site_parameter_kind kind, | |
1284 | union call_site_parameter_u kind_u, | |
8e3b41a9 JK |
1285 | struct dwarf2_per_cu_data **per_cu_return) |
1286 | { | |
9e3a7d65 JK |
1287 | CORE_ADDR func_addr, caller_pc; |
1288 | struct gdbarch *gdbarch; | |
1289 | struct frame_info *caller_frame; | |
8e3b41a9 JK |
1290 | struct call_site *call_site; |
1291 | int iparams; | |
509f0fd9 JK |
1292 | /* Initialize it just to avoid a GCC false warning. */ |
1293 | struct call_site_parameter *parameter = NULL; | |
8e3b41a9 JK |
1294 | CORE_ADDR target_addr; |
1295 | ||
9e3a7d65 JK |
1296 | while (get_frame_type (frame) == INLINE_FRAME) |
1297 | { | |
1298 | frame = get_prev_frame (frame); | |
1299 | gdb_assert (frame != NULL); | |
1300 | } | |
1301 | ||
1302 | func_addr = get_frame_func (frame); | |
1303 | gdbarch = get_frame_arch (frame); | |
1304 | caller_frame = get_prev_frame (frame); | |
8e3b41a9 JK |
1305 | if (gdbarch != frame_unwind_arch (frame)) |
1306 | { | |
7cbd4a93 TT |
1307 | struct bound_minimal_symbol msym |
1308 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1309 | struct gdbarch *caller_gdbarch = frame_unwind_arch (frame); |
1310 | ||
1311 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1312 | _("DW_OP_entry_value resolving callee gdbarch %s " |
8e3b41a9 JK |
1313 | "(of %s (%s)) does not match caller gdbarch %s"), |
1314 | gdbarch_bfd_arch_info (gdbarch)->printable_name, | |
1315 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1316 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 1317 | : msym.minsym->print_name ()), |
8e3b41a9 JK |
1318 | gdbarch_bfd_arch_info (caller_gdbarch)->printable_name); |
1319 | } | |
1320 | ||
1321 | if (caller_frame == NULL) | |
1322 | { | |
7cbd4a93 TT |
1323 | struct bound_minimal_symbol msym |
1324 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 | 1325 | |
216f72a1 | 1326 | throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_entry_value resolving " |
8e3b41a9 JK |
1327 | "requires caller of %s (%s)"), |
1328 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1329 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 1330 | : msym.minsym->print_name ())); |
8e3b41a9 JK |
1331 | } |
1332 | caller_pc = get_frame_pc (caller_frame); | |
1333 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1334 | ||
1335 | target_addr = call_site_to_target_addr (gdbarch, call_site, caller_frame); | |
1336 | if (target_addr != func_addr) | |
1337 | { | |
1338 | struct minimal_symbol *target_msym, *func_msym; | |
1339 | ||
7cbd4a93 TT |
1340 | target_msym = lookup_minimal_symbol_by_pc (target_addr).minsym; |
1341 | func_msym = lookup_minimal_symbol_by_pc (func_addr).minsym; | |
8e3b41a9 | 1342 | throw_error (NO_ENTRY_VALUE_ERROR, |
216f72a1 | 1343 | _("DW_OP_entry_value resolving expects callee %s at %s " |
8e3b41a9 JK |
1344 | "but the called frame is for %s at %s"), |
1345 | (target_msym == NULL ? "???" | |
c9d95fa3 | 1346 | : target_msym->print_name ()), |
8e3b41a9 | 1347 | paddress (gdbarch, target_addr), |
c9d95fa3 | 1348 | func_msym == NULL ? "???" : func_msym->print_name (), |
8e3b41a9 JK |
1349 | paddress (gdbarch, func_addr)); |
1350 | } | |
1351 | ||
2d6c5dc2 JK |
1352 | /* No entry value based parameters would be reliable if this function can |
1353 | call itself via tail calls. */ | |
1354 | func_verify_no_selftailcall (gdbarch, func_addr); | |
1355 | ||
8e3b41a9 JK |
1356 | for (iparams = 0; iparams < call_site->parameter_count; iparams++) |
1357 | { | |
1358 | parameter = &call_site->parameter[iparams]; | |
24c5c679 | 1359 | if (call_site_parameter_matches (parameter, kind, kind_u)) |
8e3b41a9 JK |
1360 | break; |
1361 | } | |
1362 | if (iparams == call_site->parameter_count) | |
1363 | { | |
7cbd4a93 TT |
1364 | struct minimal_symbol *msym |
1365 | = lookup_minimal_symbol_by_pc (caller_pc).minsym; | |
8e3b41a9 | 1366 | |
216f72a1 | 1367 | /* DW_TAG_call_site_parameter will be missing just if GCC could not |
8e3b41a9 JK |
1368 | determine its value. */ |
1369 | throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot find matching parameter " | |
216f72a1 | 1370 | "at DW_TAG_call_site %s at %s"), |
8e3b41a9 | 1371 | paddress (gdbarch, caller_pc), |
c9d95fa3 | 1372 | msym == NULL ? "???" : msym->print_name ()); |
8e3b41a9 JK |
1373 | } |
1374 | ||
1375 | *per_cu_return = call_site->per_cu; | |
1376 | return parameter; | |
1377 | } | |
1378 | ||
a471c594 | 1379 | /* Return value for PARAMETER matching DEREF_SIZE. If DEREF_SIZE is -1, return |
216f72a1 JK |
1380 | the normal DW_AT_call_value block. Otherwise return the |
1381 | DW_AT_call_data_value (dereferenced) block. | |
e18b2753 JK |
1382 | |
1383 | TYPE and CALLER_FRAME specify how to evaluate the DWARF block into returned | |
1384 | struct value. | |
1385 | ||
1386 | Function always returns non-NULL, non-optimized out value. It throws | |
1387 | NO_ENTRY_VALUE_ERROR if it cannot resolve the value for any reason. */ | |
1388 | ||
1389 | static struct value * | |
1390 | dwarf_entry_parameter_to_value (struct call_site_parameter *parameter, | |
a471c594 | 1391 | CORE_ADDR deref_size, struct type *type, |
e18b2753 JK |
1392 | struct frame_info *caller_frame, |
1393 | struct dwarf2_per_cu_data *per_cu) | |
1394 | { | |
a471c594 | 1395 | const gdb_byte *data_src; |
e18b2753 | 1396 | gdb_byte *data; |
a471c594 JK |
1397 | size_t size; |
1398 | ||
1399 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
1400 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1401 | ||
1402 | /* DEREF_SIZE size is not verified here. */ | |
1403 | if (data_src == NULL) | |
1404 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1405 | _("Cannot resolve DW_AT_call_data_value")); |
e18b2753 | 1406 | |
216f72a1 | 1407 | /* DW_AT_call_value is a DWARF expression, not a DWARF |
e18b2753 JK |
1408 | location. Postprocessing of DWARF_VALUE_MEMORY would lose the type from |
1409 | DWARF block. */ | |
224c3ddb | 1410 | data = (gdb_byte *) alloca (size + 1); |
a471c594 JK |
1411 | memcpy (data, data_src, size); |
1412 | data[size] = DW_OP_stack_value; | |
e18b2753 | 1413 | |
a471c594 | 1414 | return dwarf2_evaluate_loc_desc (type, caller_frame, data, size + 1, per_cu); |
e18b2753 JK |
1415 | } |
1416 | ||
a471c594 JK |
1417 | /* VALUE must be of type lval_computed with entry_data_value_funcs. Perform |
1418 | the indirect method on it, that is use its stored target value, the sole | |
1419 | purpose of entry_data_value_funcs.. */ | |
1420 | ||
1421 | static struct value * | |
1422 | entry_data_value_coerce_ref (const struct value *value) | |
1423 | { | |
1424 | struct type *checked_type = check_typedef (value_type (value)); | |
1425 | struct value *target_val; | |
1426 | ||
aa006118 | 1427 | if (!TYPE_IS_REFERENCE (checked_type)) |
a471c594 JK |
1428 | return NULL; |
1429 | ||
9a3c8263 | 1430 | target_val = (struct value *) value_computed_closure (value); |
a471c594 JK |
1431 | value_incref (target_val); |
1432 | return target_val; | |
1433 | } | |
1434 | ||
1435 | /* Implement copy_closure. */ | |
1436 | ||
1437 | static void * | |
1438 | entry_data_value_copy_closure (const struct value *v) | |
1439 | { | |
9a3c8263 | 1440 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1441 | |
1442 | value_incref (target_val); | |
1443 | return target_val; | |
1444 | } | |
1445 | ||
1446 | /* Implement free_closure. */ | |
1447 | ||
1448 | static void | |
1449 | entry_data_value_free_closure (struct value *v) | |
1450 | { | |
9a3c8263 | 1451 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 | 1452 | |
22bc8444 | 1453 | value_decref (target_val); |
a471c594 JK |
1454 | } |
1455 | ||
1456 | /* Vector for methods for an entry value reference where the referenced value | |
1457 | is stored in the caller. On the first dereference use | |
216f72a1 | 1458 | DW_AT_call_data_value in the caller. */ |
a471c594 JK |
1459 | |
1460 | static const struct lval_funcs entry_data_value_funcs = | |
1461 | { | |
1462 | NULL, /* read */ | |
1463 | NULL, /* write */ | |
a471c594 JK |
1464 | NULL, /* indirect */ |
1465 | entry_data_value_coerce_ref, | |
1466 | NULL, /* check_synthetic_pointer */ | |
1467 | entry_data_value_copy_closure, | |
1468 | entry_data_value_free_closure | |
1469 | }; | |
1470 | ||
24c5c679 JK |
1471 | /* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U |
1472 | are used to match DW_AT_location at the caller's | |
216f72a1 | 1473 | DW_TAG_call_site_parameter. |
e18b2753 JK |
1474 | |
1475 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1476 | cannot resolve the parameter for any reason. */ | |
1477 | ||
1478 | static struct value * | |
1479 | value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame, | |
24c5c679 JK |
1480 | enum call_site_parameter_kind kind, |
1481 | union call_site_parameter_u kind_u) | |
e18b2753 | 1482 | { |
a471c594 JK |
1483 | struct type *checked_type = check_typedef (type); |
1484 | struct type *target_type = TYPE_TARGET_TYPE (checked_type); | |
e18b2753 | 1485 | struct frame_info *caller_frame = get_prev_frame (frame); |
a471c594 | 1486 | struct value *outer_val, *target_val, *val; |
e18b2753 JK |
1487 | struct call_site_parameter *parameter; |
1488 | struct dwarf2_per_cu_data *caller_per_cu; | |
1489 | ||
24c5c679 | 1490 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
e18b2753 JK |
1491 | &caller_per_cu); |
1492 | ||
a471c594 JK |
1493 | outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */, |
1494 | type, caller_frame, | |
1495 | caller_per_cu); | |
1496 | ||
216f72a1 | 1497 | /* Check if DW_AT_call_data_value cannot be used. If it should be |
a471c594 JK |
1498 | used and it is not available do not fall back to OUTER_VAL - dereferencing |
1499 | TYPE_CODE_REF with non-entry data value would give current value - not the | |
1500 | entry value. */ | |
1501 | ||
aa006118 | 1502 | if (!TYPE_IS_REFERENCE (checked_type) |
a471c594 JK |
1503 | || TYPE_TARGET_TYPE (checked_type) == NULL) |
1504 | return outer_val; | |
1505 | ||
1506 | target_val = dwarf_entry_parameter_to_value (parameter, | |
1507 | TYPE_LENGTH (target_type), | |
1508 | target_type, caller_frame, | |
1509 | caller_per_cu); | |
1510 | ||
a471c594 | 1511 | val = allocate_computed_value (type, &entry_data_value_funcs, |
895dafa6 | 1512 | release_value (target_val).release ()); |
a471c594 JK |
1513 | |
1514 | /* Copy the referencing pointer to the new computed value. */ | |
1515 | memcpy (value_contents_raw (val), value_contents_raw (outer_val), | |
1516 | TYPE_LENGTH (checked_type)); | |
1517 | set_value_lazy (val, 0); | |
1518 | ||
1519 | return val; | |
e18b2753 JK |
1520 | } |
1521 | ||
1522 | /* Read parameter of TYPE at (callee) FRAME's function entry. DATA and | |
1523 | SIZE are DWARF block used to match DW_AT_location at the caller's | |
216f72a1 | 1524 | DW_TAG_call_site_parameter. |
e18b2753 JK |
1525 | |
1526 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1527 | cannot resolve the parameter for any reason. */ | |
1528 | ||
1529 | static struct value * | |
1530 | value_of_dwarf_block_entry (struct type *type, struct frame_info *frame, | |
1531 | const gdb_byte *block, size_t block_len) | |
1532 | { | |
24c5c679 | 1533 | union call_site_parameter_u kind_u; |
e18b2753 | 1534 | |
24c5c679 JK |
1535 | kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len); |
1536 | if (kind_u.dwarf_reg != -1) | |
1537 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG, | |
1538 | kind_u); | |
e18b2753 | 1539 | |
24c5c679 JK |
1540 | if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset)) |
1541 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET, | |
1542 | kind_u); | |
e18b2753 JK |
1543 | |
1544 | /* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message | |
1545 | suppressed during normal operation. The expression can be arbitrary if | |
1546 | there is no caller-callee entry value binding expected. */ | |
1547 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1548 | _("DWARF-2 expression error: DW_OP_entry_value is supported " |
e18b2753 JK |
1549 | "only for single DW_OP_reg* or for DW_OP_fbreg(*)")); |
1550 | } | |
1551 | ||
052b9502 NF |
1552 | struct piece_closure |
1553 | { | |
88bfdde4 | 1554 | /* Reference count. */ |
1e467161 | 1555 | int refc = 0; |
88bfdde4 | 1556 | |
a50264ba TT |
1557 | /* The objfile from which this closure's expression came. */ |
1558 | dwarf2_per_objfile *per_objfile = nullptr; | |
1559 | ||
8cf6f0b1 | 1560 | /* The CU from which this closure's expression came. */ |
1e467161 | 1561 | struct dwarf2_per_cu_data *per_cu = NULL; |
052b9502 | 1562 | |
1e467161 SM |
1563 | /* The pieces describing this variable. */ |
1564 | std::vector<dwarf_expr_piece> pieces; | |
ee40d8d4 YQ |
1565 | |
1566 | /* Frame ID of frame to which a register value is relative, used | |
1567 | only by DWARF_VALUE_REGISTER. */ | |
1568 | struct frame_id frame_id; | |
052b9502 NF |
1569 | }; |
1570 | ||
1571 | /* Allocate a closure for a value formed from separately-described | |
1572 | PIECES. */ | |
1573 | ||
1574 | static struct piece_closure * | |
8cf6f0b1 | 1575 | allocate_piece_closure (struct dwarf2_per_cu_data *per_cu, |
1e467161 | 1576 | std::vector<dwarf_expr_piece> &&pieces, |
ddd7882a | 1577 | struct frame_info *frame) |
052b9502 | 1578 | { |
1e467161 | 1579 | struct piece_closure *c = new piece_closure; |
052b9502 | 1580 | |
88bfdde4 | 1581 | c->refc = 1; |
a50264ba TT |
1582 | /* We must capture this here due to sharing of DWARF state. */ |
1583 | c->per_objfile = per_cu->dwarf2_per_objfile; | |
8cf6f0b1 | 1584 | c->per_cu = per_cu; |
1e467161 | 1585 | c->pieces = std::move (pieces); |
ee40d8d4 YQ |
1586 | if (frame == NULL) |
1587 | c->frame_id = null_frame_id; | |
1588 | else | |
1589 | c->frame_id = get_frame_id (frame); | |
052b9502 | 1590 | |
1e467161 SM |
1591 | for (dwarf_expr_piece &piece : c->pieces) |
1592 | if (piece.location == DWARF_VALUE_STACK) | |
1593 | value_incref (piece.v.value); | |
052b9502 NF |
1594 | |
1595 | return c; | |
1596 | } | |
1597 | ||
03c8af18 AA |
1598 | /* Return the number of bytes overlapping a contiguous chunk of N_BITS |
1599 | bits whose first bit is located at bit offset START. */ | |
1600 | ||
1601 | static size_t | |
1602 | bits_to_bytes (ULONGEST start, ULONGEST n_bits) | |
1603 | { | |
1604 | return (start % 8 + n_bits + 7) / 8; | |
1605 | } | |
1606 | ||
55acdf22 AA |
1607 | /* Read or write a pieced value V. If FROM != NULL, operate in "write |
1608 | mode": copy FROM into the pieces comprising V. If FROM == NULL, | |
1609 | operate in "read mode": fetch the contents of the (lazy) value V by | |
1610 | composing it from its pieces. */ | |
1611 | ||
052b9502 | 1612 | static void |
55acdf22 | 1613 | rw_pieced_value (struct value *v, struct value *from) |
052b9502 NF |
1614 | { |
1615 | int i; | |
359b19bb | 1616 | LONGEST offset = 0, max_offset; |
d3b1e874 | 1617 | ULONGEST bits_to_skip; |
55acdf22 AA |
1618 | gdb_byte *v_contents; |
1619 | const gdb_byte *from_contents; | |
3e43a32a MS |
1620 | struct piece_closure *c |
1621 | = (struct piece_closure *) value_computed_closure (v); | |
d5722aa2 | 1622 | gdb::byte_vector buffer; |
d5a22e77 | 1623 | bool bits_big_endian = type_byte_order (value_type (v)) == BFD_ENDIAN_BIG; |
afd74c5f | 1624 | |
55acdf22 AA |
1625 | if (from != NULL) |
1626 | { | |
1627 | from_contents = value_contents (from); | |
1628 | v_contents = NULL; | |
1629 | } | |
1630 | else | |
1631 | { | |
1632 | if (value_type (v) != value_enclosing_type (v)) | |
1633 | internal_error (__FILE__, __LINE__, | |
1634 | _("Should not be able to create a lazy value with " | |
1635 | "an enclosing type")); | |
1636 | v_contents = value_contents_raw (v); | |
1637 | from_contents = NULL; | |
1638 | } | |
052b9502 | 1639 | |
d3b1e874 | 1640 | bits_to_skip = 8 * value_offset (v); |
0e03807e TT |
1641 | if (value_bitsize (v)) |
1642 | { | |
af547a96 AA |
1643 | bits_to_skip += (8 * value_offset (value_parent (v)) |
1644 | + value_bitpos (v)); | |
55acdf22 | 1645 | if (from != NULL |
34877895 | 1646 | && (type_byte_order (value_type (from)) |
55acdf22 AA |
1647 | == BFD_ENDIAN_BIG)) |
1648 | { | |
1649 | /* Use the least significant bits of FROM. */ | |
1650 | max_offset = 8 * TYPE_LENGTH (value_type (from)); | |
1651 | offset = max_offset - value_bitsize (v); | |
1652 | } | |
1653 | else | |
1654 | max_offset = value_bitsize (v); | |
0e03807e TT |
1655 | } |
1656 | else | |
359b19bb | 1657 | max_offset = 8 * TYPE_LENGTH (value_type (v)); |
d3b1e874 | 1658 | |
f236533e | 1659 | /* Advance to the first non-skipped piece. */ |
1e467161 | 1660 | for (i = 0; i < c->pieces.size () && bits_to_skip >= c->pieces[i].size; i++) |
f236533e AA |
1661 | bits_to_skip -= c->pieces[i].size; |
1662 | ||
1e467161 | 1663 | for (; i < c->pieces.size () && offset < max_offset; i++) |
052b9502 NF |
1664 | { |
1665 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
55acdf22 | 1666 | size_t this_size_bits, this_size; |
359b19bb | 1667 | |
f236533e | 1668 | this_size_bits = p->size - bits_to_skip; |
359b19bb AA |
1669 | if (this_size_bits > max_offset - offset) |
1670 | this_size_bits = max_offset - offset; | |
9a619af0 | 1671 | |
cec03d70 | 1672 | switch (p->location) |
052b9502 | 1673 | { |
cec03d70 TT |
1674 | case DWARF_VALUE_REGISTER: |
1675 | { | |
ee40d8d4 | 1676 | struct frame_info *frame = frame_find_by_id (c->frame_id); |
cec03d70 | 1677 | struct gdbarch *arch = get_frame_arch (frame); |
0fde2c53 | 1678 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno); |
03c8af18 | 1679 | ULONGEST reg_bits = 8 * register_size (arch, gdb_regnum); |
0fde2c53 | 1680 | int optim, unavail; |
dcbf108f | 1681 | |
0fde2c53 | 1682 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG |
65d84b76 | 1683 | && p->offset + p->size < reg_bits) |
63b4f126 | 1684 | { |
0fde2c53 | 1685 | /* Big-endian, and we want less than full size. */ |
f236533e | 1686 | bits_to_skip += reg_bits - (p->offset + p->size); |
63b4f126 | 1687 | } |
65d84b76 | 1688 | else |
f236533e | 1689 | bits_to_skip += p->offset; |
65d84b76 | 1690 | |
f236533e | 1691 | this_size = bits_to_bytes (bits_to_skip, this_size_bits); |
d5722aa2 | 1692 | buffer.resize (this_size); |
0fde2c53 | 1693 | |
55acdf22 | 1694 | if (from == NULL) |
63b4f126 | 1695 | { |
55acdf22 AA |
1696 | /* Read mode. */ |
1697 | if (!get_frame_register_bytes (frame, gdb_regnum, | |
1698 | bits_to_skip / 8, | |
1699 | this_size, buffer.data (), | |
1700 | &optim, &unavail)) | |
1701 | { | |
1702 | if (optim) | |
1703 | mark_value_bits_optimized_out (v, offset, | |
1704 | this_size_bits); | |
1705 | if (unavail) | |
1706 | mark_value_bits_unavailable (v, offset, | |
1707 | this_size_bits); | |
1708 | break; | |
1709 | } | |
1710 | ||
1711 | copy_bitwise (v_contents, offset, | |
1712 | buffer.data (), bits_to_skip % 8, | |
1713 | this_size_bits, bits_big_endian); | |
1714 | } | |
1715 | else | |
1716 | { | |
1717 | /* Write mode. */ | |
1718 | if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0) | |
1719 | { | |
1720 | /* Data is copied non-byte-aligned into the register. | |
1721 | Need some bits from original register value. */ | |
1722 | get_frame_register_bytes (frame, gdb_regnum, | |
1723 | bits_to_skip / 8, | |
1724 | this_size, buffer.data (), | |
1725 | &optim, &unavail); | |
1726 | if (optim) | |
1727 | throw_error (OPTIMIZED_OUT_ERROR, | |
1728 | _("Can't do read-modify-write to " | |
1729 | "update bitfield; containing word " | |
1730 | "has been optimized out")); | |
1731 | if (unavail) | |
1732 | throw_error (NOT_AVAILABLE_ERROR, | |
1733 | _("Can't do read-modify-write to " | |
1734 | "update bitfield; containing word " | |
1735 | "is unavailable")); | |
1736 | } | |
1737 | ||
1738 | copy_bitwise (buffer.data (), bits_to_skip % 8, | |
1739 | from_contents, offset, | |
1740 | this_size_bits, bits_big_endian); | |
1741 | put_frame_register_bytes (frame, gdb_regnum, | |
1742 | bits_to_skip / 8, | |
1743 | this_size, buffer.data ()); | |
63b4f126 | 1744 | } |
cec03d70 TT |
1745 | } |
1746 | break; | |
1747 | ||
1748 | case DWARF_VALUE_MEMORY: | |
55acdf22 AA |
1749 | { |
1750 | bits_to_skip += p->offset; | |
1751 | ||
1752 | CORE_ADDR start_addr = p->v.mem.addr + bits_to_skip / 8; | |
1753 | ||
1754 | if (bits_to_skip % 8 == 0 && this_size_bits % 8 == 0 | |
1755 | && offset % 8 == 0) | |
1756 | { | |
1757 | /* Everything is byte-aligned; no buffer needed. */ | |
1758 | if (from != NULL) | |
1759 | write_memory_with_notification (start_addr, | |
1760 | (from_contents | |
1761 | + offset / 8), | |
1762 | this_size_bits / 8); | |
1763 | else | |
1764 | read_value_memory (v, offset, | |
1765 | p->v.mem.in_stack_memory, | |
1766 | p->v.mem.addr + bits_to_skip / 8, | |
1767 | v_contents + offset / 8, | |
1768 | this_size_bits / 8); | |
1769 | break; | |
1770 | } | |
1771 | ||
1772 | this_size = bits_to_bytes (bits_to_skip, this_size_bits); | |
d5722aa2 | 1773 | buffer.resize (this_size); |
55acdf22 AA |
1774 | |
1775 | if (from == NULL) | |
1776 | { | |
1777 | /* Read mode. */ | |
1778 | read_value_memory (v, offset, | |
1779 | p->v.mem.in_stack_memory, | |
1780 | p->v.mem.addr + bits_to_skip / 8, | |
1781 | buffer.data (), this_size); | |
1782 | copy_bitwise (v_contents, offset, | |
1783 | buffer.data (), bits_to_skip % 8, | |
1784 | this_size_bits, bits_big_endian); | |
1785 | } | |
1786 | else | |
1787 | { | |
1788 | /* Write mode. */ | |
1789 | if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0) | |
1790 | { | |
1791 | if (this_size <= 8) | |
1792 | { | |
1793 | /* Perform a single read for small sizes. */ | |
1794 | read_memory (start_addr, buffer.data (), | |
1795 | this_size); | |
1796 | } | |
1797 | else | |
1798 | { | |
1799 | /* Only the first and last bytes can possibly have | |
1800 | any bits reused. */ | |
1801 | read_memory (start_addr, buffer.data (), 1); | |
1802 | read_memory (start_addr + this_size - 1, | |
1803 | &buffer[this_size - 1], 1); | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | copy_bitwise (buffer.data (), bits_to_skip % 8, | |
1808 | from_contents, offset, | |
1809 | this_size_bits, bits_big_endian); | |
1810 | write_memory_with_notification (start_addr, | |
1811 | buffer.data (), | |
1812 | this_size); | |
1813 | } | |
1814 | } | |
cec03d70 TT |
1815 | break; |
1816 | ||
1817 | case DWARF_VALUE_STACK: | |
1818 | { | |
55acdf22 AA |
1819 | if (from != NULL) |
1820 | { | |
1821 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1822 | break; | |
1823 | } | |
1824 | ||
09ba997f | 1825 | struct objfile *objfile = c->per_cu->objfile (); |
08feed99 | 1826 | struct gdbarch *objfile_gdbarch = objfile->arch (); |
e9352324 AA |
1827 | ULONGEST stack_value_size_bits |
1828 | = 8 * TYPE_LENGTH (value_type (p->v.value)); | |
1829 | ||
1830 | /* Use zeroes if piece reaches beyond stack value. */ | |
65d84b76 | 1831 | if (p->offset + p->size > stack_value_size_bits) |
e9352324 AA |
1832 | break; |
1833 | ||
1834 | /* Piece is anchored at least significant bit end. */ | |
1835 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
f236533e | 1836 | bits_to_skip += stack_value_size_bits - p->offset - p->size; |
65d84b76 | 1837 | else |
f236533e | 1838 | bits_to_skip += p->offset; |
e9352324 | 1839 | |
55acdf22 | 1840 | copy_bitwise (v_contents, offset, |
e9352324 | 1841 | value_contents_all (p->v.value), |
f236533e | 1842 | bits_to_skip, |
e9352324 | 1843 | this_size_bits, bits_big_endian); |
cec03d70 TT |
1844 | } |
1845 | break; | |
1846 | ||
1847 | case DWARF_VALUE_LITERAL: | |
1848 | { | |
55acdf22 AA |
1849 | if (from != NULL) |
1850 | { | |
1851 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1852 | break; | |
1853 | } | |
1854 | ||
242d31ab AA |
1855 | ULONGEST literal_size_bits = 8 * p->v.literal.length; |
1856 | size_t n = this_size_bits; | |
afd74c5f | 1857 | |
242d31ab | 1858 | /* Cut off at the end of the implicit value. */ |
f236533e AA |
1859 | bits_to_skip += p->offset; |
1860 | if (bits_to_skip >= literal_size_bits) | |
242d31ab | 1861 | break; |
f236533e AA |
1862 | if (n > literal_size_bits - bits_to_skip) |
1863 | n = literal_size_bits - bits_to_skip; | |
e9352324 | 1864 | |
55acdf22 | 1865 | copy_bitwise (v_contents, offset, |
f236533e | 1866 | p->v.literal.data, bits_to_skip, |
242d31ab | 1867 | n, bits_big_endian); |
cec03d70 TT |
1868 | } |
1869 | break; | |
1870 | ||
8cf6f0b1 | 1871 | case DWARF_VALUE_IMPLICIT_POINTER: |
55acdf22 AA |
1872 | if (from != NULL) |
1873 | { | |
1874 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1875 | break; | |
1876 | } | |
1877 | ||
1878 | /* These bits show up as zeros -- but do not cause the value to | |
1879 | be considered optimized-out. */ | |
8cf6f0b1 TT |
1880 | break; |
1881 | ||
cb826367 | 1882 | case DWARF_VALUE_OPTIMIZED_OUT: |
9a0dc9e3 | 1883 | mark_value_bits_optimized_out (v, offset, this_size_bits); |
cb826367 TT |
1884 | break; |
1885 | ||
cec03d70 TT |
1886 | default: |
1887 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
052b9502 | 1888 | } |
d3b1e874 | 1889 | |
d3b1e874 | 1890 | offset += this_size_bits; |
f236533e | 1891 | bits_to_skip = 0; |
052b9502 NF |
1892 | } |
1893 | } | |
1894 | ||
55acdf22 | 1895 | |
052b9502 | 1896 | static void |
55acdf22 | 1897 | read_pieced_value (struct value *v) |
052b9502 | 1898 | { |
55acdf22 AA |
1899 | rw_pieced_value (v, NULL); |
1900 | } | |
242d31ab | 1901 | |
55acdf22 AA |
1902 | static void |
1903 | write_pieced_value (struct value *to, struct value *from) | |
1904 | { | |
1905 | rw_pieced_value (to, from); | |
052b9502 NF |
1906 | } |
1907 | ||
9a0dc9e3 PA |
1908 | /* An implementation of an lval_funcs method to see whether a value is |
1909 | a synthetic pointer. */ | |
8cf6f0b1 | 1910 | |
0e03807e | 1911 | static int |
6b850546 | 1912 | check_pieced_synthetic_pointer (const struct value *value, LONGEST bit_offset, |
9a0dc9e3 | 1913 | int bit_length) |
0e03807e TT |
1914 | { |
1915 | struct piece_closure *c | |
1916 | = (struct piece_closure *) value_computed_closure (value); | |
1917 | int i; | |
1918 | ||
1919 | bit_offset += 8 * value_offset (value); | |
1920 | if (value_bitsize (value)) | |
1921 | bit_offset += value_bitpos (value); | |
1922 | ||
1e467161 | 1923 | for (i = 0; i < c->pieces.size () && bit_length > 0; i++) |
0e03807e TT |
1924 | { |
1925 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
1926 | size_t this_size_bits = p->size; | |
1927 | ||
1928 | if (bit_offset > 0) | |
1929 | { | |
1930 | if (bit_offset >= this_size_bits) | |
1931 | { | |
1932 | bit_offset -= this_size_bits; | |
1933 | continue; | |
1934 | } | |
1935 | ||
1936 | bit_length -= this_size_bits - bit_offset; | |
1937 | bit_offset = 0; | |
1938 | } | |
1939 | else | |
1940 | bit_length -= this_size_bits; | |
1941 | ||
9a0dc9e3 PA |
1942 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) |
1943 | return 0; | |
0e03807e TT |
1944 | } |
1945 | ||
9a0dc9e3 | 1946 | return 1; |
8cf6f0b1 TT |
1947 | } |
1948 | ||
1949 | /* A wrapper function for get_frame_address_in_block. */ | |
1950 | ||
1951 | static CORE_ADDR | |
1952 | get_frame_address_in_block_wrapper (void *baton) | |
1953 | { | |
9a3c8263 | 1954 | return get_frame_address_in_block ((struct frame_info *) baton); |
8cf6f0b1 TT |
1955 | } |
1956 | ||
3326303b MG |
1957 | /* Fetch a DW_AT_const_value through a synthetic pointer. */ |
1958 | ||
1959 | static struct value * | |
1960 | fetch_const_value_from_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
1961 | struct dwarf2_per_cu_data *per_cu, | |
1962 | struct type *type) | |
1963 | { | |
1964 | struct value *result = NULL; | |
3326303b MG |
1965 | const gdb_byte *bytes; |
1966 | LONGEST len; | |
1967 | ||
8268c778 | 1968 | auto_obstack temp_obstack; |
3326303b MG |
1969 | bytes = dwarf2_fetch_constant_bytes (die, per_cu, &temp_obstack, &len); |
1970 | ||
1971 | if (bytes != NULL) | |
1972 | { | |
1973 | if (byte_offset >= 0 | |
1974 | && byte_offset + TYPE_LENGTH (TYPE_TARGET_TYPE (type)) <= len) | |
1975 | { | |
1976 | bytes += byte_offset; | |
1977 | result = value_from_contents (TYPE_TARGET_TYPE (type), bytes); | |
1978 | } | |
1979 | else | |
1980 | invalid_synthetic_pointer (); | |
1981 | } | |
1982 | else | |
1983 | result = allocate_optimized_out_value (TYPE_TARGET_TYPE (type)); | |
1984 | ||
3326303b MG |
1985 | return result; |
1986 | } | |
1987 | ||
1988 | /* Fetch the value pointed to by a synthetic pointer. */ | |
1989 | ||
1990 | static struct value * | |
1991 | indirect_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
1992 | struct dwarf2_per_cu_data *per_cu, | |
e4a62c65 TV |
1993 | struct frame_info *frame, struct type *type, |
1994 | bool resolve_abstract_p) | |
3326303b MG |
1995 | { |
1996 | /* Fetch the location expression of the DIE we're pointing to. */ | |
1997 | struct dwarf2_locexpr_baton baton | |
1998 | = dwarf2_fetch_die_loc_sect_off (die, per_cu, | |
e4a62c65 TV |
1999 | get_frame_address_in_block_wrapper, frame, |
2000 | resolve_abstract_p); | |
3326303b | 2001 | |
7942e96e AA |
2002 | /* Get type of pointed-to DIE. */ |
2003 | struct type *orig_type = dwarf2_fetch_die_type_sect_off (die, per_cu); | |
2004 | if (orig_type == NULL) | |
2005 | invalid_synthetic_pointer (); | |
2006 | ||
3326303b MG |
2007 | /* If pointed-to DIE has a DW_AT_location, evaluate it and return the |
2008 | resulting value. Otherwise, it may have a DW_AT_const_value instead, | |
2009 | or it may've been optimized out. */ | |
2010 | if (baton.data != NULL) | |
7942e96e AA |
2011 | return dwarf2_evaluate_loc_desc_full (orig_type, frame, baton.data, |
2012 | baton.size, baton.per_cu, | |
2013 | TYPE_TARGET_TYPE (type), | |
3326303b MG |
2014 | byte_offset); |
2015 | else | |
2016 | return fetch_const_value_from_synthetic_pointer (die, byte_offset, per_cu, | |
2017 | type); | |
2018 | } | |
2019 | ||
8cf6f0b1 TT |
2020 | /* An implementation of an lval_funcs method to indirect through a |
2021 | pointer. This handles the synthetic pointer case when needed. */ | |
2022 | ||
2023 | static struct value * | |
2024 | indirect_pieced_value (struct value *value) | |
2025 | { | |
2026 | struct piece_closure *c | |
2027 | = (struct piece_closure *) value_computed_closure (value); | |
2028 | struct type *type; | |
2029 | struct frame_info *frame; | |
6b850546 DT |
2030 | int i, bit_length; |
2031 | LONGEST bit_offset; | |
8cf6f0b1 | 2032 | struct dwarf_expr_piece *piece = NULL; |
8cf6f0b1 | 2033 | LONGEST byte_offset; |
b597c318 | 2034 | enum bfd_endian byte_order; |
8cf6f0b1 | 2035 | |
0e37a63c | 2036 | type = check_typedef (value_type (value)); |
78134374 | 2037 | if (type->code () != TYPE_CODE_PTR) |
8cf6f0b1 TT |
2038 | return NULL; |
2039 | ||
2040 | bit_length = 8 * TYPE_LENGTH (type); | |
2041 | bit_offset = 8 * value_offset (value); | |
2042 | if (value_bitsize (value)) | |
2043 | bit_offset += value_bitpos (value); | |
2044 | ||
1e467161 | 2045 | for (i = 0; i < c->pieces.size () && bit_length > 0; i++) |
8cf6f0b1 TT |
2046 | { |
2047 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2048 | size_t this_size_bits = p->size; | |
2049 | ||
2050 | if (bit_offset > 0) | |
2051 | { | |
2052 | if (bit_offset >= this_size_bits) | |
2053 | { | |
2054 | bit_offset -= this_size_bits; | |
2055 | continue; | |
2056 | } | |
2057 | ||
2058 | bit_length -= this_size_bits - bit_offset; | |
2059 | bit_offset = 0; | |
2060 | } | |
2061 | else | |
2062 | bit_length -= this_size_bits; | |
2063 | ||
2064 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
2065 | return NULL; | |
2066 | ||
2067 | if (bit_length != 0) | |
216f72a1 | 2068 | error (_("Invalid use of DW_OP_implicit_pointer")); |
8cf6f0b1 TT |
2069 | |
2070 | piece = p; | |
2071 | break; | |
2072 | } | |
2073 | ||
3326303b | 2074 | gdb_assert (piece != NULL); |
8cf6f0b1 | 2075 | frame = get_selected_frame (_("No frame selected.")); |
543305c9 | 2076 | |
5bd1ef56 TT |
2077 | /* This is an offset requested by GDB, such as value subscripts. |
2078 | However, due to how synthetic pointers are implemented, this is | |
2079 | always presented to us as a pointer type. This means we have to | |
b597c318 YQ |
2080 | sign-extend it manually as appropriate. Use raw |
2081 | extract_signed_integer directly rather than value_as_address and | |
2082 | sign extend afterwards on architectures that would need it | |
2083 | (mostly everywhere except MIPS, which has signed addresses) as | |
2084 | the later would go through gdbarch_pointer_to_address and thus | |
2085 | return a CORE_ADDR with high bits set on architectures that | |
2086 | encode address spaces and other things in CORE_ADDR. */ | |
2087 | byte_order = gdbarch_byte_order (get_frame_arch (frame)); | |
2088 | byte_offset = extract_signed_integer (value_contents (value), | |
2089 | TYPE_LENGTH (type), byte_order); | |
5bd1ef56 | 2090 | byte_offset += piece->v.ptr.offset; |
8cf6f0b1 | 2091 | |
9c541725 PA |
2092 | return indirect_synthetic_pointer (piece->v.ptr.die_sect_off, |
2093 | byte_offset, c->per_cu, | |
3326303b MG |
2094 | frame, type); |
2095 | } | |
8cf6f0b1 | 2096 | |
3326303b MG |
2097 | /* Implementation of the coerce_ref method of lval_funcs for synthetic C++ |
2098 | references. */ | |
b6807d98 | 2099 | |
3326303b MG |
2100 | static struct value * |
2101 | coerce_pieced_ref (const struct value *value) | |
2102 | { | |
2103 | struct type *type = check_typedef (value_type (value)); | |
b6807d98 | 2104 | |
3326303b MG |
2105 | if (value_bits_synthetic_pointer (value, value_embedded_offset (value), |
2106 | TARGET_CHAR_BIT * TYPE_LENGTH (type))) | |
2107 | { | |
2108 | const struct piece_closure *closure | |
2109 | = (struct piece_closure *) value_computed_closure (value); | |
2110 | struct frame_info *frame | |
2111 | = get_selected_frame (_("No frame selected.")); | |
2112 | ||
2113 | /* gdb represents synthetic pointers as pieced values with a single | |
2114 | piece. */ | |
2115 | gdb_assert (closure != NULL); | |
1e467161 | 2116 | gdb_assert (closure->pieces.size () == 1); |
3326303b | 2117 | |
1e467161 SM |
2118 | return indirect_synthetic_pointer |
2119 | (closure->pieces[0].v.ptr.die_sect_off, | |
2120 | closure->pieces[0].v.ptr.offset, | |
2121 | closure->per_cu, frame, type); | |
3326303b MG |
2122 | } |
2123 | else | |
2124 | { | |
2125 | /* Else: not a synthetic reference; do nothing. */ | |
2126 | return NULL; | |
2127 | } | |
0e03807e TT |
2128 | } |
2129 | ||
052b9502 | 2130 | static void * |
0e03807e | 2131 | copy_pieced_value_closure (const struct value *v) |
052b9502 | 2132 | { |
3e43a32a MS |
2133 | struct piece_closure *c |
2134 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2135 | |
88bfdde4 TT |
2136 | ++c->refc; |
2137 | return c; | |
052b9502 NF |
2138 | } |
2139 | ||
2140 | static void | |
2141 | free_pieced_value_closure (struct value *v) | |
2142 | { | |
3e43a32a MS |
2143 | struct piece_closure *c |
2144 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2145 | |
88bfdde4 TT |
2146 | --c->refc; |
2147 | if (c->refc == 0) | |
2148 | { | |
1e467161 SM |
2149 | for (dwarf_expr_piece &p : c->pieces) |
2150 | if (p.location == DWARF_VALUE_STACK) | |
22bc8444 | 2151 | value_decref (p.v.value); |
8a9b8146 | 2152 | |
1e467161 | 2153 | delete c; |
88bfdde4 | 2154 | } |
052b9502 NF |
2155 | } |
2156 | ||
2157 | /* Functions for accessing a variable described by DW_OP_piece. */ | |
c8f2448a | 2158 | static const struct lval_funcs pieced_value_funcs = { |
052b9502 NF |
2159 | read_pieced_value, |
2160 | write_pieced_value, | |
8cf6f0b1 | 2161 | indirect_pieced_value, |
3326303b | 2162 | coerce_pieced_ref, |
8cf6f0b1 | 2163 | check_pieced_synthetic_pointer, |
052b9502 NF |
2164 | copy_pieced_value_closure, |
2165 | free_pieced_value_closure | |
2166 | }; | |
2167 | ||
4c2df51b | 2168 | /* Evaluate a location description, starting at DATA and with length |
8cf6f0b1 | 2169 | SIZE, to find the current location of variable of TYPE in the |
7942e96e AA |
2170 | context of FRAME. If SUBOBJ_TYPE is non-NULL, return instead the |
2171 | location of the subobject of type SUBOBJ_TYPE at byte offset | |
2172 | SUBOBJ_BYTE_OFFSET within the variable of type TYPE. */ | |
a2d33775 | 2173 | |
8cf6f0b1 TT |
2174 | static struct value * |
2175 | dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame, | |
56eb65bd | 2176 | const gdb_byte *data, size_t size, |
8cf6f0b1 | 2177 | struct dwarf2_per_cu_data *per_cu, |
7942e96e AA |
2178 | struct type *subobj_type, |
2179 | LONGEST subobj_byte_offset) | |
4c2df51b | 2180 | { |
4c2df51b | 2181 | struct value *retval; |
09ba997f | 2182 | struct objfile *objfile = per_cu->objfile (); |
4c2df51b | 2183 | |
7942e96e AA |
2184 | if (subobj_type == NULL) |
2185 | { | |
2186 | subobj_type = type; | |
2187 | subobj_byte_offset = 0; | |
2188 | } | |
2189 | else if (subobj_byte_offset < 0) | |
8cf6f0b1 TT |
2190 | invalid_synthetic_pointer (); |
2191 | ||
0d53c4c4 | 2192 | if (size == 0) |
7942e96e | 2193 | return allocate_optimized_out_value (subobj_type); |
0d53c4c4 | 2194 | |
89b07335 SM |
2195 | dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile); |
2196 | dwarf_evaluate_loc_desc ctx (per_objfile); | |
192ca6d8 TT |
2197 | ctx.frame = frame; |
2198 | ctx.per_cu = per_cu; | |
2199 | ctx.obj_address = 0; | |
4c2df51b | 2200 | |
0cf08227 | 2201 | scoped_value_mark free_values; |
4a227398 | 2202 | |
08feed99 | 2203 | ctx.gdbarch = objfile->arch (); |
09ba997f TT |
2204 | ctx.addr_size = per_cu->addr_size (); |
2205 | ctx.ref_addr_size = per_cu->ref_addr_size (); | |
4c2df51b | 2206 | |
a70b8144 | 2207 | try |
79e1a869 | 2208 | { |
595d2e30 | 2209 | ctx.eval (data, size); |
79e1a869 | 2210 | } |
230d2906 | 2211 | catch (const gdb_exception_error &ex) |
79e1a869 PA |
2212 | { |
2213 | if (ex.error == NOT_AVAILABLE_ERROR) | |
2214 | { | |
0cf08227 | 2215 | free_values.free_to_mark (); |
7942e96e AA |
2216 | retval = allocate_value (subobj_type); |
2217 | mark_value_bytes_unavailable (retval, 0, | |
2218 | TYPE_LENGTH (subobj_type)); | |
79e1a869 PA |
2219 | return retval; |
2220 | } | |
8e3b41a9 JK |
2221 | else if (ex.error == NO_ENTRY_VALUE_ERROR) |
2222 | { | |
2223 | if (entry_values_debug) | |
2224 | exception_print (gdb_stdout, ex); | |
0cf08227 | 2225 | free_values.free_to_mark (); |
7942e96e | 2226 | return allocate_optimized_out_value (subobj_type); |
8e3b41a9 | 2227 | } |
79e1a869 | 2228 | else |
eedc3f4f | 2229 | throw; |
79e1a869 PA |
2230 | } |
2231 | ||
1e467161 | 2232 | if (ctx.pieces.size () > 0) |
87808bd6 | 2233 | { |
052b9502 | 2234 | struct piece_closure *c; |
8cf6f0b1 | 2235 | ULONGEST bit_size = 0; |
052b9502 | 2236 | |
1e467161 SM |
2237 | for (dwarf_expr_piece &piece : ctx.pieces) |
2238 | bit_size += piece.size; | |
03278692 TT |
2239 | /* Complain if the expression is larger than the size of the |
2240 | outer type. */ | |
2241 | if (bit_size > 8 * TYPE_LENGTH (type)) | |
8cf6f0b1 TT |
2242 | invalid_synthetic_pointer (); |
2243 | ||
1e467161 | 2244 | c = allocate_piece_closure (per_cu, std::move (ctx.pieces), frame); |
72fc29ff TT |
2245 | /* We must clean up the value chain after creating the piece |
2246 | closure but before allocating the result. */ | |
0cf08227 | 2247 | free_values.free_to_mark (); |
7942e96e AA |
2248 | retval = allocate_computed_value (subobj_type, |
2249 | &pieced_value_funcs, c); | |
2250 | set_value_offset (retval, subobj_byte_offset); | |
87808bd6 | 2251 | } |
4c2df51b DJ |
2252 | else |
2253 | { | |
718b9626 | 2254 | switch (ctx.location) |
cec03d70 TT |
2255 | { |
2256 | case DWARF_VALUE_REGISTER: | |
2257 | { | |
2258 | struct gdbarch *arch = get_frame_arch (frame); | |
7c33b57c | 2259 | int dwarf_regnum |
595d2e30 | 2260 | = longest_to_int (value_as_long (ctx.fetch (0))); |
0fde2c53 | 2261 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, dwarf_regnum); |
9a619af0 | 2262 | |
7942e96e | 2263 | if (subobj_byte_offset != 0) |
8cf6f0b1 | 2264 | error (_("cannot use offset on synthetic pointer to register")); |
0cf08227 | 2265 | free_values.free_to_mark (); |
7942e96e | 2266 | retval = value_from_register (subobj_type, gdb_regnum, frame); |
0fde2c53 DE |
2267 | if (value_optimized_out (retval)) |
2268 | { | |
2269 | struct value *tmp; | |
2270 | ||
2271 | /* This means the register has undefined value / was | |
2272 | not saved. As we're computing the location of some | |
2273 | variable etc. in the program, not a value for | |
2274 | inspecting a register ($pc, $sp, etc.), return a | |
2275 | generic optimized out value instead, so that we show | |
2276 | <optimized out> instead of <not saved>. */ | |
7942e96e AA |
2277 | tmp = allocate_value (subobj_type); |
2278 | value_contents_copy (tmp, 0, retval, 0, | |
2279 | TYPE_LENGTH (subobj_type)); | |
0fde2c53 DE |
2280 | retval = tmp; |
2281 | } | |
cec03d70 TT |
2282 | } |
2283 | break; | |
2284 | ||
2285 | case DWARF_VALUE_MEMORY: | |
2286 | { | |
f56331b4 | 2287 | struct type *ptr_type; |
595d2e30 | 2288 | CORE_ADDR address = ctx.fetch_address (0); |
69009882 | 2289 | bool in_stack_memory = ctx.fetch_in_stack_memory (0); |
cec03d70 | 2290 | |
f56331b4 KB |
2291 | /* DW_OP_deref_size (and possibly other operations too) may |
2292 | create a pointer instead of an address. Ideally, the | |
2293 | pointer to address conversion would be performed as part | |
2294 | of those operations, but the type of the object to | |
2295 | which the address refers is not known at the time of | |
2296 | the operation. Therefore, we do the conversion here | |
2297 | since the type is readily available. */ | |
2298 | ||
78134374 | 2299 | switch (subobj_type->code ()) |
f56331b4 KB |
2300 | { |
2301 | case TYPE_CODE_FUNC: | |
2302 | case TYPE_CODE_METHOD: | |
718b9626 | 2303 | ptr_type = builtin_type (ctx.gdbarch)->builtin_func_ptr; |
f56331b4 KB |
2304 | break; |
2305 | default: | |
718b9626 | 2306 | ptr_type = builtin_type (ctx.gdbarch)->builtin_data_ptr; |
f56331b4 KB |
2307 | break; |
2308 | } | |
2309 | address = value_as_address (value_from_pointer (ptr_type, address)); | |
2310 | ||
0cf08227 | 2311 | free_values.free_to_mark (); |
7942e96e AA |
2312 | retval = value_at_lazy (subobj_type, |
2313 | address + subobj_byte_offset); | |
44353522 DE |
2314 | if (in_stack_memory) |
2315 | set_value_stack (retval, 1); | |
cec03d70 TT |
2316 | } |
2317 | break; | |
2318 | ||
2319 | case DWARF_VALUE_STACK: | |
2320 | { | |
595d2e30 | 2321 | struct value *value = ctx.fetch (0); |
8a9b8146 | 2322 | size_t n = TYPE_LENGTH (value_type (value)); |
7942e96e AA |
2323 | size_t len = TYPE_LENGTH (subobj_type); |
2324 | size_t max = TYPE_LENGTH (type); | |
08feed99 | 2325 | struct gdbarch *objfile_gdbarch = objfile->arch (); |
cec03d70 | 2326 | |
7942e96e | 2327 | if (subobj_byte_offset + len > max) |
8cf6f0b1 TT |
2328 | invalid_synthetic_pointer (); |
2329 | ||
72fc29ff TT |
2330 | /* Preserve VALUE because we are going to free values back |
2331 | to the mark, but we still need the value contents | |
2332 | below. */ | |
bbfa6f00 | 2333 | value_ref_ptr value_holder = value_ref_ptr::new_reference (value); |
0cf08227 | 2334 | free_values.free_to_mark (); |
72fc29ff | 2335 | |
7942e96e | 2336 | retval = allocate_value (subobj_type); |
b6cede78 | 2337 | |
7942e96e AA |
2338 | /* The given offset is relative to the actual object. */ |
2339 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2340 | subobj_byte_offset += n - max; | |
2341 | ||
2342 | memcpy (value_contents_raw (retval), | |
2343 | value_contents_all (value) + subobj_byte_offset, len); | |
cec03d70 TT |
2344 | } |
2345 | break; | |
2346 | ||
2347 | case DWARF_VALUE_LITERAL: | |
2348 | { | |
2349 | bfd_byte *contents; | |
7942e96e | 2350 | size_t n = TYPE_LENGTH (subobj_type); |
cec03d70 | 2351 | |
7942e96e | 2352 | if (subobj_byte_offset + n > ctx.len) |
8cf6f0b1 TT |
2353 | invalid_synthetic_pointer (); |
2354 | ||
0cf08227 | 2355 | free_values.free_to_mark (); |
7942e96e | 2356 | retval = allocate_value (subobj_type); |
cec03d70 | 2357 | contents = value_contents_raw (retval); |
7942e96e | 2358 | memcpy (contents, ctx.data + subobj_byte_offset, n); |
cec03d70 TT |
2359 | } |
2360 | break; | |
2361 | ||
dd90784c | 2362 | case DWARF_VALUE_OPTIMIZED_OUT: |
0cf08227 | 2363 | free_values.free_to_mark (); |
7942e96e | 2364 | retval = allocate_optimized_out_value (subobj_type); |
dd90784c JK |
2365 | break; |
2366 | ||
8cf6f0b1 TT |
2367 | /* DWARF_VALUE_IMPLICIT_POINTER was converted to a pieced |
2368 | operation by execute_stack_op. */ | |
2369 | case DWARF_VALUE_IMPLICIT_POINTER: | |
cb826367 TT |
2370 | /* DWARF_VALUE_OPTIMIZED_OUT can't occur in this context -- |
2371 | it can only be encountered when making a piece. */ | |
cec03d70 TT |
2372 | default: |
2373 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
2374 | } | |
4c2df51b DJ |
2375 | } |
2376 | ||
718b9626 | 2377 | set_value_initialized (retval, ctx.initialized); |
42be36b3 | 2378 | |
4c2df51b DJ |
2379 | return retval; |
2380 | } | |
8cf6f0b1 TT |
2381 | |
2382 | /* The exported interface to dwarf2_evaluate_loc_desc_full; it always | |
2383 | passes 0 as the byte_offset. */ | |
2384 | ||
2385 | struct value * | |
2386 | dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame, | |
56eb65bd | 2387 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2388 | struct dwarf2_per_cu_data *per_cu) |
2389 | { | |
7942e96e AA |
2390 | return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, |
2391 | NULL, 0); | |
8cf6f0b1 TT |
2392 | } |
2393 | ||
b249d2c2 TT |
2394 | /* A specialization of dwarf_evaluate_loc_desc that is used by |
2395 | dwarf2_locexpr_baton_eval. This subclass exists to handle the case | |
2396 | where a caller of dwarf2_locexpr_baton_eval passes in some data, | |
2397 | but with the address being 0. In this situation, we arrange for | |
2398 | memory reads to come from the passed-in buffer. */ | |
2399 | ||
2400 | struct evaluate_for_locexpr_baton : public dwarf_evaluate_loc_desc | |
2401 | { | |
89b07335 SM |
2402 | evaluate_for_locexpr_baton (dwarf2_per_objfile *per_objfile) |
2403 | : dwarf_evaluate_loc_desc (per_objfile) | |
2404 | {} | |
2405 | ||
b249d2c2 TT |
2406 | /* The data that was passed in. */ |
2407 | gdb::array_view<const gdb_byte> data_view; | |
2408 | ||
2409 | CORE_ADDR get_object_address () override | |
2410 | { | |
2411 | if (data_view.data () == nullptr && obj_address == 0) | |
2412 | error (_("Location address is not set.")); | |
2413 | return obj_address; | |
2414 | } | |
2415 | ||
2416 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override | |
2417 | { | |
2418 | if (len == 0) | |
2419 | return; | |
2420 | ||
2421 | /* Prefer the passed-in memory, if it exists. */ | |
2422 | CORE_ADDR offset = addr - obj_address; | |
2423 | if (offset < data_view.size () && offset + len <= data_view.size ()) | |
2424 | { | |
2425 | memcpy (buf, data_view.data (), len); | |
2426 | return; | |
2427 | } | |
2428 | ||
2429 | read_memory (addr, buf, len); | |
2430 | } | |
2431 | }; | |
2432 | ||
2433 | /* Evaluates a dwarf expression and stores the result in VAL, | |
2434 | expecting that the dwarf expression only produces a single | |
2435 | CORE_ADDR. FRAME is the frame in which the expression is | |
2436 | evaluated. ADDR_STACK is a context (location of a variable) and | |
2437 | might be needed to evaluate the location expression. | |
2438 | PUSH_INITIAL_VALUE is true if the address (either from ADDR_STACK, | |
2439 | or the default of 0) should be pushed on the DWARF expression | |
2440 | evaluation stack before evaluating the expression; this is required | |
2441 | by certain forms of DWARF expression. Returns 1 on success, 0 | |
2442 | otherwise. */ | |
80180f79 SA |
2443 | |
2444 | static int | |
2445 | dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton, | |
63e43d3a | 2446 | struct frame_info *frame, |
b249d2c2 | 2447 | const struct property_addr_info *addr_stack, |
61122aa9 TT |
2448 | CORE_ADDR *valp, |
2449 | bool push_initial_value) | |
80180f79 | 2450 | { |
80180f79 SA |
2451 | if (dlbaton == NULL || dlbaton->size == 0) |
2452 | return 0; | |
2453 | ||
89b07335 SM |
2454 | dwarf2_per_objfile *per_objfile = dlbaton->per_objfile; |
2455 | evaluate_for_locexpr_baton ctx (per_objfile); | |
80180f79 | 2456 | |
192ca6d8 TT |
2457 | ctx.frame = frame; |
2458 | ctx.per_cu = dlbaton->per_cu; | |
b249d2c2 TT |
2459 | if (addr_stack == nullptr) |
2460 | ctx.obj_address = 0; | |
2461 | else | |
2462 | { | |
2463 | ctx.obj_address = addr_stack->addr; | |
2464 | ctx.data_view = addr_stack->valaddr; | |
2465 | } | |
80180f79 | 2466 | |
89b07335 | 2467 | ctx.gdbarch = per_objfile->objfile->arch (); |
09ba997f TT |
2468 | ctx.addr_size = dlbaton->per_cu->addr_size (); |
2469 | ctx.ref_addr_size = dlbaton->per_cu->ref_addr_size (); | |
80180f79 | 2470 | |
61122aa9 | 2471 | if (push_initial_value) |
b249d2c2 | 2472 | ctx.push_address (ctx.obj_address, false); |
61122aa9 | 2473 | |
a70b8144 | 2474 | try |
16f808ec TV |
2475 | { |
2476 | ctx.eval (dlbaton->data, dlbaton->size); | |
2477 | } | |
230d2906 | 2478 | catch (const gdb_exception_error &ex) |
16f808ec TV |
2479 | { |
2480 | if (ex.error == NOT_AVAILABLE_ERROR) | |
2481 | { | |
2482 | return 0; | |
2483 | } | |
2484 | else if (ex.error == NO_ENTRY_VALUE_ERROR) | |
2485 | { | |
2486 | if (entry_values_debug) | |
2487 | exception_print (gdb_stdout, ex); | |
2488 | return 0; | |
2489 | } | |
2490 | else | |
eedc3f4f | 2491 | throw; |
16f808ec | 2492 | } |
80180f79 | 2493 | |
718b9626 | 2494 | switch (ctx.location) |
80180f79 SA |
2495 | { |
2496 | case DWARF_VALUE_REGISTER: | |
2497 | case DWARF_VALUE_MEMORY: | |
2498 | case DWARF_VALUE_STACK: | |
595d2e30 | 2499 | *valp = ctx.fetch_address (0); |
718b9626 | 2500 | if (ctx.location == DWARF_VALUE_REGISTER) |
192ca6d8 | 2501 | *valp = ctx.read_addr_from_reg (*valp); |
80180f79 SA |
2502 | return 1; |
2503 | case DWARF_VALUE_LITERAL: | |
718b9626 TT |
2504 | *valp = extract_signed_integer (ctx.data, ctx.len, |
2505 | gdbarch_byte_order (ctx.gdbarch)); | |
80180f79 SA |
2506 | return 1; |
2507 | /* Unsupported dwarf values. */ | |
2508 | case DWARF_VALUE_OPTIMIZED_OUT: | |
2509 | case DWARF_VALUE_IMPLICIT_POINTER: | |
2510 | break; | |
2511 | } | |
2512 | ||
80180f79 SA |
2513 | return 0; |
2514 | } | |
2515 | ||
2516 | /* See dwarf2loc.h. */ | |
2517 | ||
603490bf | 2518 | bool |
08412b07 | 2519 | dwarf2_evaluate_property (const struct dynamic_prop *prop, |
63e43d3a | 2520 | struct frame_info *frame, |
fe26d3a3 | 2521 | const struct property_addr_info *addr_stack, |
61122aa9 TT |
2522 | CORE_ADDR *value, |
2523 | bool push_initial_value) | |
80180f79 SA |
2524 | { |
2525 | if (prop == NULL) | |
603490bf | 2526 | return false; |
80180f79 | 2527 | |
63e43d3a PMR |
2528 | if (frame == NULL && has_stack_frames ()) |
2529 | frame = get_selected_frame (NULL); | |
2530 | ||
80180f79 SA |
2531 | switch (prop->kind) |
2532 | { | |
2533 | case PROP_LOCEXPR: | |
2534 | { | |
9a3c8263 SM |
2535 | const struct dwarf2_property_baton *baton |
2536 | = (const struct dwarf2_property_baton *) prop->data.baton; | |
9a49df9d | 2537 | gdb_assert (baton->property_type != NULL); |
80180f79 | 2538 | |
b249d2c2 | 2539 | if (dwarf2_locexpr_baton_eval (&baton->locexpr, frame, addr_stack, |
61122aa9 | 2540 | value, push_initial_value)) |
80180f79 | 2541 | { |
9a49df9d | 2542 | if (baton->locexpr.is_reference) |
80180f79 | 2543 | { |
9a49df9d | 2544 | struct value *val = value_at (baton->property_type, *value); |
80180f79 SA |
2545 | *value = value_as_address (val); |
2546 | } | |
0d4e84ed AB |
2547 | else |
2548 | { | |
2549 | gdb_assert (baton->property_type != NULL); | |
2550 | ||
2551 | struct type *type = check_typedef (baton->property_type); | |
2552 | if (TYPE_LENGTH (type) < sizeof (CORE_ADDR) | |
2553 | && !TYPE_UNSIGNED (type)) | |
2554 | { | |
2555 | /* If we have a valid return candidate and it's value | |
2556 | is signed, we have to sign-extend the value because | |
2557 | CORE_ADDR on 64bit machine has 8 bytes but address | |
2558 | size of an 32bit application is bytes. */ | |
2559 | const int addr_size | |
09ba997f | 2560 | = (baton->locexpr.per_cu->addr_size () |
0d4e84ed AB |
2561 | * TARGET_CHAR_BIT); |
2562 | const CORE_ADDR neg_mask | |
2563 | = (~((CORE_ADDR) 0) << (addr_size - 1)); | |
2564 | ||
2565 | /* Check if signed bit is set and sign-extend values. */ | |
2566 | if (*value & neg_mask) | |
2567 | *value |= neg_mask; | |
2568 | } | |
2569 | } | |
603490bf | 2570 | return true; |
80180f79 SA |
2571 | } |
2572 | } | |
2573 | break; | |
2574 | ||
2575 | case PROP_LOCLIST: | |
2576 | { | |
9a3c8263 SM |
2577 | struct dwarf2_property_baton *baton |
2578 | = (struct dwarf2_property_baton *) prop->data.baton; | |
1c33af77 | 2579 | CORE_ADDR pc; |
80180f79 SA |
2580 | const gdb_byte *data; |
2581 | struct value *val; | |
2582 | size_t size; | |
2583 | ||
1c33af77 TV |
2584 | if (frame == NULL |
2585 | || !get_frame_address_in_block_if_available (frame, &pc)) | |
2586 | return false; | |
2587 | ||
80180f79 SA |
2588 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); |
2589 | if (data != NULL) | |
2590 | { | |
9a49df9d | 2591 | val = dwarf2_evaluate_loc_desc (baton->property_type, frame, data, |
80180f79 SA |
2592 | size, baton->loclist.per_cu); |
2593 | if (!value_optimized_out (val)) | |
2594 | { | |
2595 | *value = value_as_address (val); | |
603490bf | 2596 | return true; |
80180f79 SA |
2597 | } |
2598 | } | |
2599 | } | |
2600 | break; | |
2601 | ||
2602 | case PROP_CONST: | |
2603 | *value = prop->data.const_val; | |
603490bf | 2604 | return true; |
df25ebbd JB |
2605 | |
2606 | case PROP_ADDR_OFFSET: | |
2607 | { | |
9a3c8263 SM |
2608 | struct dwarf2_property_baton *baton |
2609 | = (struct dwarf2_property_baton *) prop->data.baton; | |
fe26d3a3 | 2610 | const struct property_addr_info *pinfo; |
df25ebbd JB |
2611 | struct value *val; |
2612 | ||
2613 | for (pinfo = addr_stack; pinfo != NULL; pinfo = pinfo->next) | |
988915ee TT |
2614 | { |
2615 | /* This approach lets us avoid checking the qualifiers. */ | |
2616 | if (TYPE_MAIN_TYPE (pinfo->type) | |
9a49df9d | 2617 | == TYPE_MAIN_TYPE (baton->property_type)) |
988915ee TT |
2618 | break; |
2619 | } | |
df25ebbd | 2620 | if (pinfo == NULL) |
2c811c0f | 2621 | error (_("cannot find reference address for offset property")); |
b249d2c2 | 2622 | if (pinfo->valaddr.data () != NULL) |
c3345124 JB |
2623 | val = value_from_contents |
2624 | (baton->offset_info.type, | |
b249d2c2 | 2625 | pinfo->valaddr.data () + baton->offset_info.offset); |
c3345124 JB |
2626 | else |
2627 | val = value_at (baton->offset_info.type, | |
2628 | pinfo->addr + baton->offset_info.offset); | |
df25ebbd | 2629 | *value = value_as_address (val); |
603490bf | 2630 | return true; |
df25ebbd | 2631 | } |
80180f79 SA |
2632 | } |
2633 | ||
603490bf | 2634 | return false; |
80180f79 SA |
2635 | } |
2636 | ||
bb2ec1b3 TT |
2637 | /* See dwarf2loc.h. */ |
2638 | ||
2639 | void | |
d82b3862 | 2640 | dwarf2_compile_property_to_c (string_file *stream, |
bb2ec1b3 TT |
2641 | const char *result_name, |
2642 | struct gdbarch *gdbarch, | |
2643 | unsigned char *registers_used, | |
2644 | const struct dynamic_prop *prop, | |
2645 | CORE_ADDR pc, | |
2646 | struct symbol *sym) | |
2647 | { | |
9a3c8263 SM |
2648 | struct dwarf2_property_baton *baton |
2649 | = (struct dwarf2_property_baton *) prop->data.baton; | |
bb2ec1b3 TT |
2650 | const gdb_byte *data; |
2651 | size_t size; | |
2652 | struct dwarf2_per_cu_data *per_cu; | |
2653 | ||
2654 | if (prop->kind == PROP_LOCEXPR) | |
2655 | { | |
2656 | data = baton->locexpr.data; | |
2657 | size = baton->locexpr.size; | |
2658 | per_cu = baton->locexpr.per_cu; | |
2659 | } | |
2660 | else | |
2661 | { | |
2662 | gdb_assert (prop->kind == PROP_LOCLIST); | |
2663 | ||
2664 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2665 | per_cu = baton->loclist.per_cu; | |
2666 | } | |
2667 | ||
2668 | compile_dwarf_bounds_to_c (stream, result_name, prop, sym, pc, | |
2669 | gdbarch, registers_used, | |
09ba997f | 2670 | per_cu->addr_size (), |
bb2ec1b3 TT |
2671 | data, data + size, per_cu); |
2672 | } | |
2673 | ||
4c2df51b | 2674 | \f |
0b31a4bc | 2675 | /* Helper functions and baton for dwarf2_loc_desc_get_symbol_read_needs. */ |
4c2df51b | 2676 | |
192ca6d8 | 2677 | class symbol_needs_eval_context : public dwarf_expr_context |
4c2df51b | 2678 | { |
89b07335 SM |
2679 | public: |
2680 | symbol_needs_eval_context (dwarf2_per_objfile *per_objfile) | |
2681 | : dwarf_expr_context (per_objfile) | |
2682 | {} | |
192ca6d8 | 2683 | |
0b31a4bc | 2684 | enum symbol_needs_kind needs; |
17ea53c3 | 2685 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b | 2686 | |
192ca6d8 | 2687 | /* Reads from registers do require a frame. */ |
632e107b | 2688 | CORE_ADDR read_addr_from_reg (int regnum) override |
192ca6d8 TT |
2689 | { |
2690 | needs = SYMBOL_NEEDS_FRAME; | |
2691 | return 1; | |
2692 | } | |
2693 | ||
2694 | /* "get_reg_value" callback: Reads from registers do require a | |
2695 | frame. */ | |
2696 | ||
632e107b | 2697 | struct value *get_reg_value (struct type *type, int regnum) override |
192ca6d8 TT |
2698 | { |
2699 | needs = SYMBOL_NEEDS_FRAME; | |
2700 | return value_zero (type, not_lval); | |
2701 | } | |
2702 | ||
2703 | /* Reads from memory do not require a frame. */ | |
632e107b | 2704 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override |
192ca6d8 TT |
2705 | { |
2706 | memset (buf, 0, len); | |
2707 | } | |
2708 | ||
2709 | /* Frame-relative accesses do require a frame. */ | |
632e107b | 2710 | void get_frame_base (const gdb_byte **start, size_t *length) override |
192ca6d8 TT |
2711 | { |
2712 | static gdb_byte lit0 = DW_OP_lit0; | |
2713 | ||
2714 | *start = &lit0; | |
2715 | *length = 1; | |
2716 | ||
2717 | needs = SYMBOL_NEEDS_FRAME; | |
2718 | } | |
2719 | ||
2720 | /* CFA accesses require a frame. */ | |
632e107b | 2721 | CORE_ADDR get_frame_cfa () override |
192ca6d8 TT |
2722 | { |
2723 | needs = SYMBOL_NEEDS_FRAME; | |
2724 | return 1; | |
2725 | } | |
2726 | ||
632e107b | 2727 | CORE_ADDR get_frame_pc () override |
7d5697f9 TT |
2728 | { |
2729 | needs = SYMBOL_NEEDS_FRAME; | |
2730 | return 1; | |
2731 | } | |
2732 | ||
192ca6d8 | 2733 | /* Thread-local accesses require registers, but not a frame. */ |
632e107b | 2734 | CORE_ADDR get_tls_address (CORE_ADDR offset) override |
192ca6d8 TT |
2735 | { |
2736 | if (needs <= SYMBOL_NEEDS_REGISTERS) | |
2737 | needs = SYMBOL_NEEDS_REGISTERS; | |
2738 | return 1; | |
2739 | } | |
2740 | ||
2741 | /* Helper interface of per_cu_dwarf_call for | |
2742 | dwarf2_loc_desc_get_symbol_read_needs. */ | |
2743 | ||
632e107b | 2744 | void dwarf_call (cu_offset die_offset) override |
192ca6d8 TT |
2745 | { |
2746 | per_cu_dwarf_call (this, die_offset, per_cu); | |
2747 | } | |
2748 | ||
a6b786da KB |
2749 | /* Helper interface of sect_variable_value for |
2750 | dwarf2_loc_desc_get_symbol_read_needs. */ | |
2751 | ||
2752 | struct value *dwarf_variable_value (sect_offset sect_off) override | |
2753 | { | |
2754 | return sect_variable_value (this, sect_off, per_cu); | |
2755 | } | |
2756 | ||
216f72a1 | 2757 | /* DW_OP_entry_value accesses require a caller, therefore a |
192ca6d8 TT |
2758 | frame. */ |
2759 | ||
2760 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
2761 | union call_site_parameter_u kind_u, | |
632e107b | 2762 | int deref_size) override |
192ca6d8 TT |
2763 | { |
2764 | needs = SYMBOL_NEEDS_FRAME; | |
3019eac3 | 2765 | |
192ca6d8 TT |
2766 | /* The expression may require some stub values on DWARF stack. */ |
2767 | push_address (0, 0); | |
2768 | } | |
3019eac3 | 2769 | |
336d760d | 2770 | /* DW_OP_addrx and DW_OP_GNU_addr_index doesn't require a frame. */ |
08412b07 | 2771 | |
632e107b | 2772 | CORE_ADDR get_addr_index (unsigned int index) override |
192ca6d8 TT |
2773 | { |
2774 | /* Nothing to do. */ | |
2775 | return 1; | |
2776 | } | |
08412b07 | 2777 | |
192ca6d8 | 2778 | /* DW_OP_push_object_address has a frame already passed through. */ |
9e8b7a03 | 2779 | |
632e107b | 2780 | CORE_ADDR get_object_address () override |
192ca6d8 TT |
2781 | { |
2782 | /* Nothing to do. */ | |
2783 | return 1; | |
2784 | } | |
9e8b7a03 JK |
2785 | }; |
2786 | ||
0b31a4bc TT |
2787 | /* Compute the correct symbol_needs_kind value for the location |
2788 | expression at DATA (length SIZE). */ | |
4c2df51b | 2789 | |
0b31a4bc TT |
2790 | static enum symbol_needs_kind |
2791 | dwarf2_loc_desc_get_symbol_read_needs (const gdb_byte *data, size_t size, | |
2792 | struct dwarf2_per_cu_data *per_cu) | |
4c2df51b | 2793 | { |
f630a401 | 2794 | int in_reg; |
09ba997f | 2795 | struct objfile *objfile = per_cu->objfile (); |
4c2df51b | 2796 | |
eb115069 TT |
2797 | scoped_value_mark free_values; |
2798 | ||
89b07335 | 2799 | symbol_needs_eval_context ctx (get_dwarf2_per_objfile (objfile)); |
192ca6d8 TT |
2800 | |
2801 | ctx.needs = SYMBOL_NEEDS_NONE; | |
2802 | ctx.per_cu = per_cu; | |
08feed99 | 2803 | ctx.gdbarch = objfile->arch (); |
09ba997f TT |
2804 | ctx.addr_size = per_cu->addr_size (); |
2805 | ctx.ref_addr_size = per_cu->ref_addr_size (); | |
4c2df51b | 2806 | |
595d2e30 | 2807 | ctx.eval (data, size); |
4c2df51b | 2808 | |
718b9626 | 2809 | in_reg = ctx.location == DWARF_VALUE_REGISTER; |
f630a401 | 2810 | |
1e467161 SM |
2811 | /* If the location has several pieces, and any of them are in |
2812 | registers, then we will need a frame to fetch them from. */ | |
2813 | for (dwarf_expr_piece &p : ctx.pieces) | |
2814 | if (p.location == DWARF_VALUE_REGISTER) | |
2815 | in_reg = 1; | |
87808bd6 | 2816 | |
0b31a4bc | 2817 | if (in_reg) |
192ca6d8 TT |
2818 | ctx.needs = SYMBOL_NEEDS_FRAME; |
2819 | return ctx.needs; | |
4c2df51b DJ |
2820 | } |
2821 | ||
3cf03773 TT |
2822 | /* A helper function that throws an unimplemented error mentioning a |
2823 | given DWARF operator. */ | |
2824 | ||
621846f4 | 2825 | static void ATTRIBUTE_NORETURN |
3cf03773 | 2826 | unimplemented (unsigned int op) |
0d53c4c4 | 2827 | { |
f39c6ffd | 2828 | const char *name = get_DW_OP_name (op); |
b1bfef65 TT |
2829 | |
2830 | if (name) | |
2831 | error (_("DWARF operator %s cannot be translated to an agent expression"), | |
2832 | name); | |
2833 | else | |
1ba1b353 TT |
2834 | error (_("Unknown DWARF operator 0x%02x cannot be translated " |
2835 | "to an agent expression"), | |
b1bfef65 | 2836 | op); |
3cf03773 | 2837 | } |
08922a10 | 2838 | |
0fde2c53 DE |
2839 | /* See dwarf2loc.h. |
2840 | ||
2841 | This is basically a wrapper on gdbarch_dwarf2_reg_to_regnum so that we | |
2842 | can issue a complaint, which is better than having every target's | |
2843 | implementation of dwarf2_reg_to_regnum do it. */ | |
08922a10 | 2844 | |
d064d1be | 2845 | int |
0fde2c53 | 2846 | dwarf_reg_to_regnum (struct gdbarch *arch, int dwarf_reg) |
3cf03773 TT |
2847 | { |
2848 | int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg); | |
0fde2c53 | 2849 | |
3cf03773 | 2850 | if (reg == -1) |
0fde2c53 | 2851 | { |
b98664d3 | 2852 | complaint (_("bad DWARF register number %d"), dwarf_reg); |
0fde2c53 DE |
2853 | } |
2854 | return reg; | |
2855 | } | |
2856 | ||
2857 | /* Subroutine of dwarf_reg_to_regnum_or_error to simplify it. | |
2858 | Throw an error because DWARF_REG is bad. */ | |
2859 | ||
2860 | static void | |
2861 | throw_bad_regnum_error (ULONGEST dwarf_reg) | |
2862 | { | |
2863 | /* Still want to print -1 as "-1". | |
2864 | We *could* have int and ULONGEST versions of dwarf2_reg_to_regnum_or_error | |
2865 | but that's overkill for now. */ | |
2866 | if ((int) dwarf_reg == dwarf_reg) | |
2867 | error (_("Unable to access DWARF register number %d"), (int) dwarf_reg); | |
2868 | error (_("Unable to access DWARF register number %s"), | |
2869 | pulongest (dwarf_reg)); | |
2870 | } | |
2871 | ||
2872 | /* See dwarf2loc.h. */ | |
2873 | ||
2874 | int | |
2875 | dwarf_reg_to_regnum_or_error (struct gdbarch *arch, ULONGEST dwarf_reg) | |
2876 | { | |
2877 | int reg; | |
2878 | ||
2879 | if (dwarf_reg > INT_MAX) | |
2880 | throw_bad_regnum_error (dwarf_reg); | |
2881 | /* Yes, we will end up issuing a complaint and an error if DWARF_REG is | |
2882 | bad, but that's ok. */ | |
2883 | reg = dwarf_reg_to_regnum (arch, (int) dwarf_reg); | |
2884 | if (reg == -1) | |
2885 | throw_bad_regnum_error (dwarf_reg); | |
3cf03773 TT |
2886 | return reg; |
2887 | } | |
08922a10 | 2888 | |
3cf03773 TT |
2889 | /* A helper function that emits an access to memory. ARCH is the |
2890 | target architecture. EXPR is the expression which we are building. | |
2891 | NBITS is the number of bits we want to read. This emits the | |
2892 | opcodes needed to read the memory and then extract the desired | |
2893 | bits. */ | |
08922a10 | 2894 | |
3cf03773 TT |
2895 | static void |
2896 | access_memory (struct gdbarch *arch, struct agent_expr *expr, ULONGEST nbits) | |
08922a10 | 2897 | { |
3cf03773 TT |
2898 | ULONGEST nbytes = (nbits + 7) / 8; |
2899 | ||
9df7235c | 2900 | gdb_assert (nbytes > 0 && nbytes <= sizeof (LONGEST)); |
3cf03773 | 2901 | |
92bc6a20 | 2902 | if (expr->tracing) |
3cf03773 TT |
2903 | ax_trace_quick (expr, nbytes); |
2904 | ||
2905 | if (nbits <= 8) | |
2906 | ax_simple (expr, aop_ref8); | |
2907 | else if (nbits <= 16) | |
2908 | ax_simple (expr, aop_ref16); | |
2909 | else if (nbits <= 32) | |
2910 | ax_simple (expr, aop_ref32); | |
2911 | else | |
2912 | ax_simple (expr, aop_ref64); | |
2913 | ||
2914 | /* If we read exactly the number of bytes we wanted, we're done. */ | |
2915 | if (8 * nbytes == nbits) | |
2916 | return; | |
2917 | ||
d5a22e77 | 2918 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG) |
0d53c4c4 | 2919 | { |
3cf03773 TT |
2920 | /* On a bits-big-endian machine, we want the high-order |
2921 | NBITS. */ | |
2922 | ax_const_l (expr, 8 * nbytes - nbits); | |
2923 | ax_simple (expr, aop_rsh_unsigned); | |
0d53c4c4 | 2924 | } |
3cf03773 | 2925 | else |
0d53c4c4 | 2926 | { |
3cf03773 TT |
2927 | /* On a bits-little-endian box, we want the low-order NBITS. */ |
2928 | ax_zero_ext (expr, nbits); | |
0d53c4c4 | 2929 | } |
3cf03773 | 2930 | } |
0936ad1d | 2931 | |
8cf6f0b1 TT |
2932 | /* A helper function to return the frame's PC. */ |
2933 | ||
2934 | static CORE_ADDR | |
2935 | get_ax_pc (void *baton) | |
2936 | { | |
9a3c8263 | 2937 | struct agent_expr *expr = (struct agent_expr *) baton; |
8cf6f0b1 TT |
2938 | |
2939 | return expr->scope; | |
2940 | } | |
2941 | ||
3cf03773 TT |
2942 | /* Compile a DWARF location expression to an agent expression. |
2943 | ||
2944 | EXPR is the agent expression we are building. | |
2945 | LOC is the agent value we modify. | |
2946 | ARCH is the architecture. | |
2947 | ADDR_SIZE is the size of addresses, in bytes. | |
2948 | OP_PTR is the start of the location expression. | |
2949 | OP_END is one past the last byte of the location expression. | |
2950 | ||
2951 | This will throw an exception for various kinds of errors -- for | |
2952 | example, if the expression cannot be compiled, or if the expression | |
2953 | is invalid. */ | |
0936ad1d | 2954 | |
5707a07a | 2955 | static void |
9f6f94ff | 2956 | dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc, |
40f4af28 SM |
2957 | unsigned int addr_size, const gdb_byte *op_ptr, |
2958 | const gdb_byte *op_end, | |
9f6f94ff | 2959 | struct dwarf2_per_cu_data *per_cu) |
3cf03773 | 2960 | { |
40f4af28 | 2961 | gdbarch *arch = expr->gdbarch; |
58414334 | 2962 | std::vector<int> dw_labels, patches; |
3cf03773 TT |
2963 | const gdb_byte * const base = op_ptr; |
2964 | const gdb_byte *previous_piece = op_ptr; | |
2965 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
2966 | ULONGEST bits_collected = 0; | |
2967 | unsigned int addr_size_bits = 8 * addr_size; | |
d5a22e77 | 2968 | bool bits_big_endian = byte_order == BFD_ENDIAN_BIG; |
0936ad1d | 2969 | |
58414334 | 2970 | std::vector<int> offsets (op_end - op_ptr, -1); |
0936ad1d | 2971 | |
3cf03773 TT |
2972 | /* By default we are making an address. */ |
2973 | loc->kind = axs_lvalue_memory; | |
0d45f56e | 2974 | |
3cf03773 TT |
2975 | while (op_ptr < op_end) |
2976 | { | |
aead7601 | 2977 | enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr; |
9fccedf7 DE |
2978 | uint64_t uoffset, reg; |
2979 | int64_t offset; | |
3cf03773 TT |
2980 | int i; |
2981 | ||
2982 | offsets[op_ptr - base] = expr->len; | |
2983 | ++op_ptr; | |
2984 | ||
2985 | /* Our basic approach to code generation is to map DWARF | |
2986 | operations directly to AX operations. However, there are | |
2987 | some differences. | |
2988 | ||
2989 | First, DWARF works on address-sized units, but AX always uses | |
2990 | LONGEST. For most operations we simply ignore this | |
2991 | difference; instead we generate sign extensions as needed | |
2992 | before division and comparison operations. It would be nice | |
2993 | to omit the sign extensions, but there is no way to determine | |
2994 | the size of the target's LONGEST. (This code uses the size | |
2995 | of the host LONGEST in some cases -- that is a bug but it is | |
2996 | difficult to fix.) | |
2997 | ||
2998 | Second, some DWARF operations cannot be translated to AX. | |
2999 | For these we simply fail. See | |
3000 | http://sourceware.org/bugzilla/show_bug.cgi?id=11662. */ | |
3001 | switch (op) | |
0936ad1d | 3002 | { |
3cf03773 TT |
3003 | case DW_OP_lit0: |
3004 | case DW_OP_lit1: | |
3005 | case DW_OP_lit2: | |
3006 | case DW_OP_lit3: | |
3007 | case DW_OP_lit4: | |
3008 | case DW_OP_lit5: | |
3009 | case DW_OP_lit6: | |
3010 | case DW_OP_lit7: | |
3011 | case DW_OP_lit8: | |
3012 | case DW_OP_lit9: | |
3013 | case DW_OP_lit10: | |
3014 | case DW_OP_lit11: | |
3015 | case DW_OP_lit12: | |
3016 | case DW_OP_lit13: | |
3017 | case DW_OP_lit14: | |
3018 | case DW_OP_lit15: | |
3019 | case DW_OP_lit16: | |
3020 | case DW_OP_lit17: | |
3021 | case DW_OP_lit18: | |
3022 | case DW_OP_lit19: | |
3023 | case DW_OP_lit20: | |
3024 | case DW_OP_lit21: | |
3025 | case DW_OP_lit22: | |
3026 | case DW_OP_lit23: | |
3027 | case DW_OP_lit24: | |
3028 | case DW_OP_lit25: | |
3029 | case DW_OP_lit26: | |
3030 | case DW_OP_lit27: | |
3031 | case DW_OP_lit28: | |
3032 | case DW_OP_lit29: | |
3033 | case DW_OP_lit30: | |
3034 | case DW_OP_lit31: | |
3035 | ax_const_l (expr, op - DW_OP_lit0); | |
3036 | break; | |
0d53c4c4 | 3037 | |
3cf03773 | 3038 | case DW_OP_addr: |
ac56253d | 3039 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
3cf03773 | 3040 | op_ptr += addr_size; |
ac56253d TT |
3041 | /* Some versions of GCC emit DW_OP_addr before |
3042 | DW_OP_GNU_push_tls_address. In this case the value is an | |
3043 | index, not an address. We don't support things like | |
3044 | branching between the address and the TLS op. */ | |
3045 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
09ba997f | 3046 | uoffset += per_cu->text_offset (); |
ac56253d | 3047 | ax_const_l (expr, uoffset); |
3cf03773 | 3048 | break; |
4c2df51b | 3049 | |
3cf03773 TT |
3050 | case DW_OP_const1u: |
3051 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 1, byte_order)); | |
3052 | op_ptr += 1; | |
3053 | break; | |
3054 | case DW_OP_const1s: | |
3055 | ax_const_l (expr, extract_signed_integer (op_ptr, 1, byte_order)); | |
3056 | op_ptr += 1; | |
3057 | break; | |
3058 | case DW_OP_const2u: | |
3059 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 2, byte_order)); | |
3060 | op_ptr += 2; | |
3061 | break; | |
3062 | case DW_OP_const2s: | |
3063 | ax_const_l (expr, extract_signed_integer (op_ptr, 2, byte_order)); | |
3064 | op_ptr += 2; | |
3065 | break; | |
3066 | case DW_OP_const4u: | |
3067 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 4, byte_order)); | |
3068 | op_ptr += 4; | |
3069 | break; | |
3070 | case DW_OP_const4s: | |
3071 | ax_const_l (expr, extract_signed_integer (op_ptr, 4, byte_order)); | |
3072 | op_ptr += 4; | |
3073 | break; | |
3074 | case DW_OP_const8u: | |
3075 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 8, byte_order)); | |
3076 | op_ptr += 8; | |
3077 | break; | |
3078 | case DW_OP_const8s: | |
3079 | ax_const_l (expr, extract_signed_integer (op_ptr, 8, byte_order)); | |
3080 | op_ptr += 8; | |
3081 | break; | |
3082 | case DW_OP_constu: | |
f664829e | 3083 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
3cf03773 TT |
3084 | ax_const_l (expr, uoffset); |
3085 | break; | |
3086 | case DW_OP_consts: | |
f664829e | 3087 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
3cf03773 TT |
3088 | ax_const_l (expr, offset); |
3089 | break; | |
9c238357 | 3090 | |
3cf03773 TT |
3091 | case DW_OP_reg0: |
3092 | case DW_OP_reg1: | |
3093 | case DW_OP_reg2: | |
3094 | case DW_OP_reg3: | |
3095 | case DW_OP_reg4: | |
3096 | case DW_OP_reg5: | |
3097 | case DW_OP_reg6: | |
3098 | case DW_OP_reg7: | |
3099 | case DW_OP_reg8: | |
3100 | case DW_OP_reg9: | |
3101 | case DW_OP_reg10: | |
3102 | case DW_OP_reg11: | |
3103 | case DW_OP_reg12: | |
3104 | case DW_OP_reg13: | |
3105 | case DW_OP_reg14: | |
3106 | case DW_OP_reg15: | |
3107 | case DW_OP_reg16: | |
3108 | case DW_OP_reg17: | |
3109 | case DW_OP_reg18: | |
3110 | case DW_OP_reg19: | |
3111 | case DW_OP_reg20: | |
3112 | case DW_OP_reg21: | |
3113 | case DW_OP_reg22: | |
3114 | case DW_OP_reg23: | |
3115 | case DW_OP_reg24: | |
3116 | case DW_OP_reg25: | |
3117 | case DW_OP_reg26: | |
3118 | case DW_OP_reg27: | |
3119 | case DW_OP_reg28: | |
3120 | case DW_OP_reg29: | |
3121 | case DW_OP_reg30: | |
3122 | case DW_OP_reg31: | |
3123 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
0fde2c53 | 3124 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_reg0); |
3cf03773 TT |
3125 | loc->kind = axs_lvalue_register; |
3126 | break; | |
9c238357 | 3127 | |
3cf03773 | 3128 | case DW_OP_regx: |
f664829e | 3129 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 | 3130 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); |
0fde2c53 | 3131 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3132 | loc->kind = axs_lvalue_register; |
3133 | break; | |
08922a10 | 3134 | |
3cf03773 TT |
3135 | case DW_OP_implicit_value: |
3136 | { | |
9fccedf7 | 3137 | uint64_t len; |
3cf03773 | 3138 | |
f664829e | 3139 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &len); |
3cf03773 TT |
3140 | if (op_ptr + len > op_end) |
3141 | error (_("DW_OP_implicit_value: too few bytes available.")); | |
3142 | if (len > sizeof (ULONGEST)) | |
3143 | error (_("Cannot translate DW_OP_implicit_value of %d bytes"), | |
3144 | (int) len); | |
3145 | ||
3146 | ax_const_l (expr, extract_unsigned_integer (op_ptr, len, | |
3147 | byte_order)); | |
3148 | op_ptr += len; | |
3149 | dwarf_expr_require_composition (op_ptr, op_end, | |
3150 | "DW_OP_implicit_value"); | |
3151 | ||
3152 | loc->kind = axs_rvalue; | |
3153 | } | |
3154 | break; | |
08922a10 | 3155 | |
3cf03773 TT |
3156 | case DW_OP_stack_value: |
3157 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value"); | |
3158 | loc->kind = axs_rvalue; | |
3159 | break; | |
08922a10 | 3160 | |
3cf03773 TT |
3161 | case DW_OP_breg0: |
3162 | case DW_OP_breg1: | |
3163 | case DW_OP_breg2: | |
3164 | case DW_OP_breg3: | |
3165 | case DW_OP_breg4: | |
3166 | case DW_OP_breg5: | |
3167 | case DW_OP_breg6: | |
3168 | case DW_OP_breg7: | |
3169 | case DW_OP_breg8: | |
3170 | case DW_OP_breg9: | |
3171 | case DW_OP_breg10: | |
3172 | case DW_OP_breg11: | |
3173 | case DW_OP_breg12: | |
3174 | case DW_OP_breg13: | |
3175 | case DW_OP_breg14: | |
3176 | case DW_OP_breg15: | |
3177 | case DW_OP_breg16: | |
3178 | case DW_OP_breg17: | |
3179 | case DW_OP_breg18: | |
3180 | case DW_OP_breg19: | |
3181 | case DW_OP_breg20: | |
3182 | case DW_OP_breg21: | |
3183 | case DW_OP_breg22: | |
3184 | case DW_OP_breg23: | |
3185 | case DW_OP_breg24: | |
3186 | case DW_OP_breg25: | |
3187 | case DW_OP_breg26: | |
3188 | case DW_OP_breg27: | |
3189 | case DW_OP_breg28: | |
3190 | case DW_OP_breg29: | |
3191 | case DW_OP_breg30: | |
3192 | case DW_OP_breg31: | |
f664829e | 3193 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
0fde2c53 | 3194 | i = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_breg0); |
3cf03773 TT |
3195 | ax_reg (expr, i); |
3196 | if (offset != 0) | |
3197 | { | |
3198 | ax_const_l (expr, offset); | |
3199 | ax_simple (expr, aop_add); | |
3200 | } | |
3201 | break; | |
3202 | case DW_OP_bregx: | |
3203 | { | |
f664829e DE |
3204 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3205 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
0fde2c53 | 3206 | i = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3207 | ax_reg (expr, i); |
3208 | if (offset != 0) | |
3209 | { | |
3210 | ax_const_l (expr, offset); | |
3211 | ax_simple (expr, aop_add); | |
3212 | } | |
3213 | } | |
3214 | break; | |
3215 | case DW_OP_fbreg: | |
3216 | { | |
3217 | const gdb_byte *datastart; | |
3218 | size_t datalen; | |
3977b71f | 3219 | const struct block *b; |
3cf03773 | 3220 | struct symbol *framefunc; |
08922a10 | 3221 | |
3cf03773 TT |
3222 | b = block_for_pc (expr->scope); |
3223 | ||
3224 | if (!b) | |
3225 | error (_("No block found for address")); | |
3226 | ||
3227 | framefunc = block_linkage_function (b); | |
3228 | ||
3229 | if (!framefunc) | |
3230 | error (_("No function found for block")); | |
3231 | ||
af945b75 TT |
3232 | func_get_frame_base_dwarf_block (framefunc, expr->scope, |
3233 | &datastart, &datalen); | |
3cf03773 | 3234 | |
f664829e | 3235 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
40f4af28 | 3236 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, datastart, |
9f6f94ff | 3237 | datastart + datalen, per_cu); |
d84cf7eb TT |
3238 | if (loc->kind == axs_lvalue_register) |
3239 | require_rvalue (expr, loc); | |
3cf03773 TT |
3240 | |
3241 | if (offset != 0) | |
3242 | { | |
3243 | ax_const_l (expr, offset); | |
3244 | ax_simple (expr, aop_add); | |
3245 | } | |
3246 | ||
3247 | loc->kind = axs_lvalue_memory; | |
3248 | } | |
08922a10 | 3249 | break; |
08922a10 | 3250 | |
3cf03773 TT |
3251 | case DW_OP_dup: |
3252 | ax_simple (expr, aop_dup); | |
3253 | break; | |
08922a10 | 3254 | |
3cf03773 TT |
3255 | case DW_OP_drop: |
3256 | ax_simple (expr, aop_pop); | |
3257 | break; | |
08922a10 | 3258 | |
3cf03773 TT |
3259 | case DW_OP_pick: |
3260 | offset = *op_ptr++; | |
c7f96d2b | 3261 | ax_pick (expr, offset); |
3cf03773 TT |
3262 | break; |
3263 | ||
3264 | case DW_OP_swap: | |
3265 | ax_simple (expr, aop_swap); | |
3266 | break; | |
08922a10 | 3267 | |
3cf03773 | 3268 | case DW_OP_over: |
c7f96d2b | 3269 | ax_pick (expr, 1); |
3cf03773 | 3270 | break; |
08922a10 | 3271 | |
3cf03773 | 3272 | case DW_OP_rot: |
c7f96d2b | 3273 | ax_simple (expr, aop_rot); |
3cf03773 | 3274 | break; |
08922a10 | 3275 | |
3cf03773 TT |
3276 | case DW_OP_deref: |
3277 | case DW_OP_deref_size: | |
3278 | { | |
3279 | int size; | |
08922a10 | 3280 | |
3cf03773 TT |
3281 | if (op == DW_OP_deref_size) |
3282 | size = *op_ptr++; | |
3283 | else | |
3284 | size = addr_size; | |
3285 | ||
9df7235c | 3286 | if (size != 1 && size != 2 && size != 4 && size != 8) |
f3cec7e6 HZ |
3287 | error (_("Unsupported size %d in %s"), |
3288 | size, get_DW_OP_name (op)); | |
9df7235c | 3289 | access_memory (arch, expr, size * TARGET_CHAR_BIT); |
3cf03773 TT |
3290 | } |
3291 | break; | |
3292 | ||
3293 | case DW_OP_abs: | |
3294 | /* Sign extend the operand. */ | |
3295 | ax_ext (expr, addr_size_bits); | |
3296 | ax_simple (expr, aop_dup); | |
3297 | ax_const_l (expr, 0); | |
3298 | ax_simple (expr, aop_less_signed); | |
3299 | ax_simple (expr, aop_log_not); | |
3300 | i = ax_goto (expr, aop_if_goto); | |
3301 | /* We have to emit 0 - X. */ | |
3302 | ax_const_l (expr, 0); | |
3303 | ax_simple (expr, aop_swap); | |
3304 | ax_simple (expr, aop_sub); | |
3305 | ax_label (expr, i, expr->len); | |
3306 | break; | |
3307 | ||
3308 | case DW_OP_neg: | |
3309 | /* No need to sign extend here. */ | |
3310 | ax_const_l (expr, 0); | |
3311 | ax_simple (expr, aop_swap); | |
3312 | ax_simple (expr, aop_sub); | |
3313 | break; | |
3314 | ||
3315 | case DW_OP_not: | |
3316 | /* Sign extend the operand. */ | |
3317 | ax_ext (expr, addr_size_bits); | |
3318 | ax_simple (expr, aop_bit_not); | |
3319 | break; | |
3320 | ||
3321 | case DW_OP_plus_uconst: | |
f664829e | 3322 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 TT |
3323 | /* It would be really weird to emit `DW_OP_plus_uconst 0', |
3324 | but we micro-optimize anyhow. */ | |
3325 | if (reg != 0) | |
3326 | { | |
3327 | ax_const_l (expr, reg); | |
3328 | ax_simple (expr, aop_add); | |
3329 | } | |
3330 | break; | |
3331 | ||
3332 | case DW_OP_and: | |
3333 | ax_simple (expr, aop_bit_and); | |
3334 | break; | |
3335 | ||
3336 | case DW_OP_div: | |
3337 | /* Sign extend the operands. */ | |
3338 | ax_ext (expr, addr_size_bits); | |
3339 | ax_simple (expr, aop_swap); | |
3340 | ax_ext (expr, addr_size_bits); | |
3341 | ax_simple (expr, aop_swap); | |
3342 | ax_simple (expr, aop_div_signed); | |
08922a10 SS |
3343 | break; |
3344 | ||
3cf03773 TT |
3345 | case DW_OP_minus: |
3346 | ax_simple (expr, aop_sub); | |
3347 | break; | |
3348 | ||
3349 | case DW_OP_mod: | |
3350 | ax_simple (expr, aop_rem_unsigned); | |
3351 | break; | |
3352 | ||
3353 | case DW_OP_mul: | |
3354 | ax_simple (expr, aop_mul); | |
3355 | break; | |
3356 | ||
3357 | case DW_OP_or: | |
3358 | ax_simple (expr, aop_bit_or); | |
3359 | break; | |
3360 | ||
3361 | case DW_OP_plus: | |
3362 | ax_simple (expr, aop_add); | |
3363 | break; | |
3364 | ||
3365 | case DW_OP_shl: | |
3366 | ax_simple (expr, aop_lsh); | |
3367 | break; | |
3368 | ||
3369 | case DW_OP_shr: | |
3370 | ax_simple (expr, aop_rsh_unsigned); | |
3371 | break; | |
3372 | ||
3373 | case DW_OP_shra: | |
3374 | ax_simple (expr, aop_rsh_signed); | |
3375 | break; | |
3376 | ||
3377 | case DW_OP_xor: | |
3378 | ax_simple (expr, aop_bit_xor); | |
3379 | break; | |
3380 | ||
3381 | case DW_OP_le: | |
3382 | /* Sign extend the operands. */ | |
3383 | ax_ext (expr, addr_size_bits); | |
3384 | ax_simple (expr, aop_swap); | |
3385 | ax_ext (expr, addr_size_bits); | |
3386 | /* Note no swap here: A <= B is !(B < A). */ | |
3387 | ax_simple (expr, aop_less_signed); | |
3388 | ax_simple (expr, aop_log_not); | |
3389 | break; | |
3390 | ||
3391 | case DW_OP_ge: | |
3392 | /* Sign extend the operands. */ | |
3393 | ax_ext (expr, addr_size_bits); | |
3394 | ax_simple (expr, aop_swap); | |
3395 | ax_ext (expr, addr_size_bits); | |
3396 | ax_simple (expr, aop_swap); | |
3397 | /* A >= B is !(A < B). */ | |
3398 | ax_simple (expr, aop_less_signed); | |
3399 | ax_simple (expr, aop_log_not); | |
3400 | break; | |
3401 | ||
3402 | case DW_OP_eq: | |
3403 | /* Sign extend the operands. */ | |
3404 | ax_ext (expr, addr_size_bits); | |
3405 | ax_simple (expr, aop_swap); | |
3406 | ax_ext (expr, addr_size_bits); | |
3407 | /* No need for a second swap here. */ | |
3408 | ax_simple (expr, aop_equal); | |
3409 | break; | |
3410 | ||
3411 | case DW_OP_lt: | |
3412 | /* Sign extend the operands. */ | |
3413 | ax_ext (expr, addr_size_bits); | |
3414 | ax_simple (expr, aop_swap); | |
3415 | ax_ext (expr, addr_size_bits); | |
3416 | ax_simple (expr, aop_swap); | |
3417 | ax_simple (expr, aop_less_signed); | |
3418 | break; | |
3419 | ||
3420 | case DW_OP_gt: | |
3421 | /* Sign extend the operands. */ | |
3422 | ax_ext (expr, addr_size_bits); | |
3423 | ax_simple (expr, aop_swap); | |
3424 | ax_ext (expr, addr_size_bits); | |
3425 | /* Note no swap here: A > B is B < A. */ | |
3426 | ax_simple (expr, aop_less_signed); | |
3427 | break; | |
3428 | ||
3429 | case DW_OP_ne: | |
3430 | /* Sign extend the operands. */ | |
3431 | ax_ext (expr, addr_size_bits); | |
3432 | ax_simple (expr, aop_swap); | |
3433 | ax_ext (expr, addr_size_bits); | |
3434 | /* No need for a swap here. */ | |
3435 | ax_simple (expr, aop_equal); | |
3436 | ax_simple (expr, aop_log_not); | |
3437 | break; | |
3438 | ||
3439 | case DW_OP_call_frame_cfa: | |
a8fd5589 TT |
3440 | { |
3441 | int regnum; | |
3442 | CORE_ADDR text_offset; | |
3443 | LONGEST off; | |
3444 | const gdb_byte *cfa_start, *cfa_end; | |
3445 | ||
3446 | if (dwarf2_fetch_cfa_info (arch, expr->scope, per_cu, | |
3447 | ®num, &off, | |
3448 | &text_offset, &cfa_start, &cfa_end)) | |
3449 | { | |
3450 | /* Register. */ | |
3451 | ax_reg (expr, regnum); | |
3452 | if (off != 0) | |
3453 | { | |
3454 | ax_const_l (expr, off); | |
3455 | ax_simple (expr, aop_add); | |
3456 | } | |
3457 | } | |
3458 | else | |
3459 | { | |
3460 | /* Another expression. */ | |
3461 | ax_const_l (expr, text_offset); | |
40f4af28 SM |
3462 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, cfa_start, |
3463 | cfa_end, per_cu); | |
a8fd5589 TT |
3464 | } |
3465 | ||
3466 | loc->kind = axs_lvalue_memory; | |
3467 | } | |
3cf03773 TT |
3468 | break; |
3469 | ||
3470 | case DW_OP_GNU_push_tls_address: | |
4aa4e28b | 3471 | case DW_OP_form_tls_address: |
3cf03773 TT |
3472 | unimplemented (op); |
3473 | break; | |
3474 | ||
08412b07 JB |
3475 | case DW_OP_push_object_address: |
3476 | unimplemented (op); | |
3477 | break; | |
3478 | ||
3cf03773 TT |
3479 | case DW_OP_skip: |
3480 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3481 | op_ptr += 2; | |
3482 | i = ax_goto (expr, aop_goto); | |
58414334 TT |
3483 | dw_labels.push_back (op_ptr + offset - base); |
3484 | patches.push_back (i); | |
3cf03773 TT |
3485 | break; |
3486 | ||
3487 | case DW_OP_bra: | |
3488 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3489 | op_ptr += 2; | |
3490 | /* Zero extend the operand. */ | |
3491 | ax_zero_ext (expr, addr_size_bits); | |
3492 | i = ax_goto (expr, aop_if_goto); | |
58414334 TT |
3493 | dw_labels.push_back (op_ptr + offset - base); |
3494 | patches.push_back (i); | |
3cf03773 TT |
3495 | break; |
3496 | ||
3497 | case DW_OP_nop: | |
3498 | break; | |
3499 | ||
3500 | case DW_OP_piece: | |
3501 | case DW_OP_bit_piece: | |
08922a10 | 3502 | { |
b926417a | 3503 | uint64_t size; |
3cf03773 TT |
3504 | |
3505 | if (op_ptr - 1 == previous_piece) | |
3506 | error (_("Cannot translate empty pieces to agent expressions")); | |
3507 | previous_piece = op_ptr - 1; | |
3508 | ||
f664829e | 3509 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &size); |
3cf03773 TT |
3510 | if (op == DW_OP_piece) |
3511 | { | |
3512 | size *= 8; | |
b926417a | 3513 | uoffset = 0; |
3cf03773 TT |
3514 | } |
3515 | else | |
b926417a | 3516 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
08922a10 | 3517 | |
3cf03773 TT |
3518 | if (bits_collected + size > 8 * sizeof (LONGEST)) |
3519 | error (_("Expression pieces exceed word size")); | |
3520 | ||
3521 | /* Access the bits. */ | |
3522 | switch (loc->kind) | |
3523 | { | |
3524 | case axs_lvalue_register: | |
3525 | ax_reg (expr, loc->u.reg); | |
3526 | break; | |
3527 | ||
3528 | case axs_lvalue_memory: | |
3529 | /* Offset the pointer, if needed. */ | |
b926417a | 3530 | if (uoffset > 8) |
3cf03773 | 3531 | { |
b926417a | 3532 | ax_const_l (expr, uoffset / 8); |
3cf03773 | 3533 | ax_simple (expr, aop_add); |
b926417a | 3534 | uoffset %= 8; |
3cf03773 TT |
3535 | } |
3536 | access_memory (arch, expr, size); | |
3537 | break; | |
3538 | } | |
3539 | ||
3540 | /* For a bits-big-endian target, shift up what we already | |
3541 | have. For a bits-little-endian target, shift up the | |
3542 | new data. Note that there is a potential bug here if | |
3543 | the DWARF expression leaves multiple values on the | |
3544 | stack. */ | |
3545 | if (bits_collected > 0) | |
3546 | { | |
3547 | if (bits_big_endian) | |
3548 | { | |
3549 | ax_simple (expr, aop_swap); | |
3550 | ax_const_l (expr, size); | |
3551 | ax_simple (expr, aop_lsh); | |
3552 | /* We don't need a second swap here, because | |
3553 | aop_bit_or is symmetric. */ | |
3554 | } | |
3555 | else | |
3556 | { | |
3557 | ax_const_l (expr, size); | |
3558 | ax_simple (expr, aop_lsh); | |
3559 | } | |
3560 | ax_simple (expr, aop_bit_or); | |
3561 | } | |
3562 | ||
3563 | bits_collected += size; | |
3564 | loc->kind = axs_rvalue; | |
08922a10 SS |
3565 | } |
3566 | break; | |
08922a10 | 3567 | |
3cf03773 TT |
3568 | case DW_OP_GNU_uninit: |
3569 | unimplemented (op); | |
3570 | ||
3571 | case DW_OP_call2: | |
3572 | case DW_OP_call4: | |
3573 | { | |
3574 | struct dwarf2_locexpr_baton block; | |
3575 | int size = (op == DW_OP_call2 ? 2 : 4); | |
3576 | ||
3577 | uoffset = extract_unsigned_integer (op_ptr, size, byte_order); | |
3578 | op_ptr += size; | |
3579 | ||
b926417a TT |
3580 | cu_offset cuoffset = (cu_offset) uoffset; |
3581 | block = dwarf2_fetch_die_loc_cu_off (cuoffset, per_cu, | |
8b9737bf | 3582 | get_ax_pc, expr); |
3cf03773 TT |
3583 | |
3584 | /* DW_OP_call_ref is currently not supported. */ | |
3585 | gdb_assert (block.per_cu == per_cu); | |
3586 | ||
40f4af28 SM |
3587 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, block.data, |
3588 | block.data + block.size, per_cu); | |
3cf03773 TT |
3589 | } |
3590 | break; | |
3591 | ||
3592 | case DW_OP_call_ref: | |
3593 | unimplemented (op); | |
3594 | ||
a6b786da KB |
3595 | case DW_OP_GNU_variable_value: |
3596 | unimplemented (op); | |
3597 | ||
3cf03773 | 3598 | default: |
b1bfef65 | 3599 | unimplemented (op); |
08922a10 | 3600 | } |
08922a10 | 3601 | } |
3cf03773 TT |
3602 | |
3603 | /* Patch all the branches we emitted. */ | |
b926417a | 3604 | for (int i = 0; i < patches.size (); ++i) |
3cf03773 | 3605 | { |
58414334 | 3606 | int targ = offsets[dw_labels[i]]; |
3cf03773 TT |
3607 | if (targ == -1) |
3608 | internal_error (__FILE__, __LINE__, _("invalid label")); | |
58414334 | 3609 | ax_label (expr, patches[i], targ); |
3cf03773 | 3610 | } |
08922a10 SS |
3611 | } |
3612 | ||
4c2df51b DJ |
3613 | \f |
3614 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
3615 | evaluator to calculate the location. */ | |
3616 | static struct value * | |
3617 | locexpr_read_variable (struct symbol *symbol, struct frame_info *frame) | |
3618 | { | |
9a3c8263 SM |
3619 | struct dwarf2_locexpr_baton *dlbaton |
3620 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
4c2df51b | 3621 | struct value *val; |
9a619af0 | 3622 | |
a2d33775 JK |
3623 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data, |
3624 | dlbaton->size, dlbaton->per_cu); | |
4c2df51b DJ |
3625 | |
3626 | return val; | |
3627 | } | |
3628 | ||
e18b2753 JK |
3629 | /* Return the value of SYMBOL in FRAME at (callee) FRAME's function |
3630 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
3631 | will be thrown. */ | |
3632 | ||
3633 | static struct value * | |
3634 | locexpr_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
3635 | { | |
9a3c8263 SM |
3636 | struct dwarf2_locexpr_baton *dlbaton |
3637 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
3638 | |
3639 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, dlbaton->data, | |
3640 | dlbaton->size); | |
3641 | } | |
3642 | ||
0b31a4bc TT |
3643 | /* Implementation of get_symbol_read_needs from |
3644 | symbol_computed_ops. */ | |
3645 | ||
3646 | static enum symbol_needs_kind | |
3647 | locexpr_get_symbol_read_needs (struct symbol *symbol) | |
4c2df51b | 3648 | { |
9a3c8263 SM |
3649 | struct dwarf2_locexpr_baton *dlbaton |
3650 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
9a619af0 | 3651 | |
0b31a4bc TT |
3652 | return dwarf2_loc_desc_get_symbol_read_needs (dlbaton->data, dlbaton->size, |
3653 | dlbaton->per_cu); | |
4c2df51b DJ |
3654 | } |
3655 | ||
9eae7c52 TT |
3656 | /* Return true if DATA points to the end of a piece. END is one past |
3657 | the last byte in the expression. */ | |
3658 | ||
3659 | static int | |
3660 | piece_end_p (const gdb_byte *data, const gdb_byte *end) | |
3661 | { | |
3662 | return data == end || data[0] == DW_OP_piece || data[0] == DW_OP_bit_piece; | |
3663 | } | |
3664 | ||
5e44ecb3 TT |
3665 | /* Helper for locexpr_describe_location_piece that finds the name of a |
3666 | DWARF register. */ | |
3667 | ||
3668 | static const char * | |
3669 | locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum) | |
3670 | { | |
3671 | int regnum; | |
3672 | ||
0fde2c53 DE |
3673 | /* This doesn't use dwarf_reg_to_regnum_or_error on purpose. |
3674 | We'd rather print *something* here than throw an error. */ | |
3675 | regnum = dwarf_reg_to_regnum (gdbarch, dwarf_regnum); | |
3676 | /* gdbarch_register_name may just return "", return something more | |
3677 | descriptive for bad register numbers. */ | |
3678 | if (regnum == -1) | |
3679 | { | |
3680 | /* The text is output as "$bad_register_number". | |
3681 | That is why we use the underscores. */ | |
3682 | return _("bad_register_number"); | |
3683 | } | |
5e44ecb3 TT |
3684 | return gdbarch_register_name (gdbarch, regnum); |
3685 | } | |
3686 | ||
9eae7c52 TT |
3687 | /* Nicely describe a single piece of a location, returning an updated |
3688 | position in the bytecode sequence. This function cannot recognize | |
3689 | all locations; if a location is not recognized, it simply returns | |
f664829e DE |
3690 | DATA. If there is an error during reading, e.g. we run off the end |
3691 | of the buffer, an error is thrown. */ | |
08922a10 | 3692 | |
0d45f56e | 3693 | static const gdb_byte * |
08922a10 SS |
3694 | locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream, |
3695 | CORE_ADDR addr, struct objfile *objfile, | |
49f6c839 | 3696 | struct dwarf2_per_cu_data *per_cu, |
9eae7c52 | 3697 | const gdb_byte *data, const gdb_byte *end, |
0d45f56e | 3698 | unsigned int addr_size) |
4c2df51b | 3699 | { |
08feed99 | 3700 | struct gdbarch *gdbarch = objfile->arch (); |
49f6c839 | 3701 | size_t leb128_size; |
08922a10 SS |
3702 | |
3703 | if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31) | |
3704 | { | |
08922a10 | 3705 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3706 | locexpr_regname (gdbarch, data[0] - DW_OP_reg0)); |
08922a10 SS |
3707 | data += 1; |
3708 | } | |
3709 | else if (data[0] == DW_OP_regx) | |
3710 | { | |
9fccedf7 | 3711 | uint64_t reg; |
4c2df51b | 3712 | |
f664829e | 3713 | data = safe_read_uleb128 (data + 1, end, ®); |
08922a10 | 3714 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3715 | locexpr_regname (gdbarch, reg)); |
08922a10 SS |
3716 | } |
3717 | else if (data[0] == DW_OP_fbreg) | |
4c2df51b | 3718 | { |
3977b71f | 3719 | const struct block *b; |
08922a10 SS |
3720 | struct symbol *framefunc; |
3721 | int frame_reg = 0; | |
9fccedf7 | 3722 | int64_t frame_offset; |
7155d578 | 3723 | const gdb_byte *base_data, *new_data, *save_data = data; |
08922a10 | 3724 | size_t base_size; |
9fccedf7 | 3725 | int64_t base_offset = 0; |
08922a10 | 3726 | |
f664829e | 3727 | new_data = safe_read_sleb128 (data + 1, end, &frame_offset); |
9eae7c52 TT |
3728 | if (!piece_end_p (new_data, end)) |
3729 | return data; | |
3730 | data = new_data; | |
3731 | ||
08922a10 SS |
3732 | b = block_for_pc (addr); |
3733 | ||
3734 | if (!b) | |
3735 | error (_("No block found for address for symbol \"%s\"."), | |
987012b8 | 3736 | symbol->print_name ()); |
08922a10 SS |
3737 | |
3738 | framefunc = block_linkage_function (b); | |
3739 | ||
3740 | if (!framefunc) | |
3741 | error (_("No function found for block for symbol \"%s\"."), | |
987012b8 | 3742 | symbol->print_name ()); |
08922a10 | 3743 | |
af945b75 | 3744 | func_get_frame_base_dwarf_block (framefunc, addr, &base_data, &base_size); |
08922a10 SS |
3745 | |
3746 | if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31) | |
3747 | { | |
0d45f56e | 3748 | const gdb_byte *buf_end; |
08922a10 SS |
3749 | |
3750 | frame_reg = base_data[0] - DW_OP_breg0; | |
f664829e DE |
3751 | buf_end = safe_read_sleb128 (base_data + 1, base_data + base_size, |
3752 | &base_offset); | |
08922a10 | 3753 | if (buf_end != base_data + base_size) |
3e43a32a MS |
3754 | error (_("Unexpected opcode after " |
3755 | "DW_OP_breg%u for symbol \"%s\"."), | |
987012b8 | 3756 | frame_reg, symbol->print_name ()); |
08922a10 SS |
3757 | } |
3758 | else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31) | |
3759 | { | |
3760 | /* The frame base is just the register, with no offset. */ | |
3761 | frame_reg = base_data[0] - DW_OP_reg0; | |
3762 | base_offset = 0; | |
3763 | } | |
3764 | else | |
3765 | { | |
3766 | /* We don't know what to do with the frame base expression, | |
3767 | so we can't trace this variable; give up. */ | |
7155d578 | 3768 | return save_data; |
08922a10 SS |
3769 | } |
3770 | ||
3e43a32a MS |
3771 | fprintf_filtered (stream, |
3772 | _("a variable at frame base reg $%s offset %s+%s"), | |
5e44ecb3 | 3773 | locexpr_regname (gdbarch, frame_reg), |
08922a10 SS |
3774 | plongest (base_offset), plongest (frame_offset)); |
3775 | } | |
9eae7c52 TT |
3776 | else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31 |
3777 | && piece_end_p (data, end)) | |
08922a10 | 3778 | { |
9fccedf7 | 3779 | int64_t offset; |
08922a10 | 3780 | |
f664829e | 3781 | data = safe_read_sleb128 (data + 1, end, &offset); |
08922a10 | 3782 | |
4c2df51b | 3783 | fprintf_filtered (stream, |
08922a10 SS |
3784 | _("a variable at offset %s from base reg $%s"), |
3785 | plongest (offset), | |
5e44ecb3 | 3786 | locexpr_regname (gdbarch, data[0] - DW_OP_breg0)); |
4c2df51b DJ |
3787 | } |
3788 | ||
c3228f12 EZ |
3789 | /* The location expression for a TLS variable looks like this (on a |
3790 | 64-bit LE machine): | |
3791 | ||
3792 | DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0 | |
3793 | (DW_OP_addr: 4; DW_OP_GNU_push_tls_address) | |
09d8bd00 | 3794 | |
c3228f12 EZ |
3795 | 0x3 is the encoding for DW_OP_addr, which has an operand as long |
3796 | as the size of an address on the target machine (here is 8 | |
09d8bd00 TT |
3797 | bytes). Note that more recent version of GCC emit DW_OP_const4u |
3798 | or DW_OP_const8u, depending on address size, rather than | |
0963b4bd MS |
3799 | DW_OP_addr. 0xe0 is the encoding for DW_OP_GNU_push_tls_address. |
3800 | The operand represents the offset at which the variable is within | |
3801 | the thread local storage. */ | |
c3228f12 | 3802 | |
9eae7c52 | 3803 | else if (data + 1 + addr_size < end |
09d8bd00 TT |
3804 | && (data[0] == DW_OP_addr |
3805 | || (addr_size == 4 && data[0] == DW_OP_const4u) | |
3806 | || (addr_size == 8 && data[0] == DW_OP_const8u)) | |
4aa4e28b TT |
3807 | && (data[1 + addr_size] == DW_OP_GNU_push_tls_address |
3808 | || data[1 + addr_size] == DW_OP_form_tls_address) | |
9eae7c52 | 3809 | && piece_end_p (data + 2 + addr_size, end)) |
08922a10 | 3810 | { |
d4a087c7 UW |
3811 | ULONGEST offset; |
3812 | offset = extract_unsigned_integer (data + 1, addr_size, | |
3813 | gdbarch_byte_order (gdbarch)); | |
9a619af0 | 3814 | |
08922a10 | 3815 | fprintf_filtered (stream, |
d4a087c7 | 3816 | _("a thread-local variable at offset 0x%s " |
08922a10 | 3817 | "in the thread-local storage for `%s'"), |
4262abfb | 3818 | phex_nz (offset, addr_size), objfile_name (objfile)); |
08922a10 SS |
3819 | |
3820 | data += 1 + addr_size + 1; | |
3821 | } | |
49f6c839 DE |
3822 | |
3823 | /* With -gsplit-dwarf a TLS variable can also look like this: | |
3824 | DW_AT_location : 3 byte block: fc 4 e0 | |
3825 | (DW_OP_GNU_const_index: 4; | |
3826 | DW_OP_GNU_push_tls_address) */ | |
3827 | else if (data + 3 <= end | |
3828 | && data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end | |
3829 | && data[0] == DW_OP_GNU_const_index | |
3830 | && leb128_size > 0 | |
4aa4e28b TT |
3831 | && (data[1 + leb128_size] == DW_OP_GNU_push_tls_address |
3832 | || data[1 + leb128_size] == DW_OP_form_tls_address) | |
49f6c839 DE |
3833 | && piece_end_p (data + 2 + leb128_size, end)) |
3834 | { | |
a55c1f32 | 3835 | uint64_t offset; |
49f6c839 DE |
3836 | |
3837 | data = safe_read_uleb128 (data + 1, end, &offset); | |
3838 | offset = dwarf2_read_addr_index (per_cu, offset); | |
3839 | fprintf_filtered (stream, | |
3840 | _("a thread-local variable at offset 0x%s " | |
3841 | "in the thread-local storage for `%s'"), | |
4262abfb | 3842 | phex_nz (offset, addr_size), objfile_name (objfile)); |
49f6c839 DE |
3843 | ++data; |
3844 | } | |
3845 | ||
9eae7c52 TT |
3846 | else if (data[0] >= DW_OP_lit0 |
3847 | && data[0] <= DW_OP_lit31 | |
3848 | && data + 1 < end | |
3849 | && data[1] == DW_OP_stack_value) | |
3850 | { | |
3851 | fprintf_filtered (stream, _("the constant %d"), data[0] - DW_OP_lit0); | |
3852 | data += 2; | |
3853 | } | |
3854 | ||
3855 | return data; | |
3856 | } | |
3857 | ||
3858 | /* Disassemble an expression, stopping at the end of a piece or at the | |
3859 | end of the expression. Returns a pointer to the next unread byte | |
3860 | in the input expression. If ALL is nonzero, then this function | |
f664829e DE |
3861 | will keep going until it reaches the end of the expression. |
3862 | If there is an error during reading, e.g. we run off the end | |
3863 | of the buffer, an error is thrown. */ | |
9eae7c52 TT |
3864 | |
3865 | static const gdb_byte * | |
3866 | disassemble_dwarf_expression (struct ui_file *stream, | |
3867 | struct gdbarch *arch, unsigned int addr_size, | |
2bda9cc5 | 3868 | int offset_size, const gdb_byte *start, |
9eae7c52 | 3869 | const gdb_byte *data, const gdb_byte *end, |
2bda9cc5 | 3870 | int indent, int all, |
5e44ecb3 | 3871 | struct dwarf2_per_cu_data *per_cu) |
9eae7c52 | 3872 | { |
9eae7c52 TT |
3873 | while (data < end |
3874 | && (all | |
3875 | || (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece))) | |
3876 | { | |
aead7601 | 3877 | enum dwarf_location_atom op = (enum dwarf_location_atom) *data++; |
9fccedf7 DE |
3878 | uint64_t ul; |
3879 | int64_t l; | |
9eae7c52 TT |
3880 | const char *name; |
3881 | ||
f39c6ffd | 3882 | name = get_DW_OP_name (op); |
9eae7c52 TT |
3883 | |
3884 | if (!name) | |
3885 | error (_("Unrecognized DWARF opcode 0x%02x at %ld"), | |
06826322 | 3886 | op, (long) (data - 1 - start)); |
2bda9cc5 JK |
3887 | fprintf_filtered (stream, " %*ld: %s", indent + 4, |
3888 | (long) (data - 1 - start), name); | |
9eae7c52 TT |
3889 | |
3890 | switch (op) | |
3891 | { | |
3892 | case DW_OP_addr: | |
d4a087c7 UW |
3893 | ul = extract_unsigned_integer (data, addr_size, |
3894 | gdbarch_byte_order (arch)); | |
9eae7c52 | 3895 | data += addr_size; |
d4a087c7 | 3896 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); |
9eae7c52 TT |
3897 | break; |
3898 | ||
3899 | case DW_OP_const1u: | |
3900 | ul = extract_unsigned_integer (data, 1, gdbarch_byte_order (arch)); | |
3901 | data += 1; | |
3902 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3903 | break; | |
3904 | case DW_OP_const1s: | |
3905 | l = extract_signed_integer (data, 1, gdbarch_byte_order (arch)); | |
3906 | data += 1; | |
3907 | fprintf_filtered (stream, " %s", plongest (l)); | |
3908 | break; | |
3909 | case DW_OP_const2u: | |
3910 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3911 | data += 2; | |
3912 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3913 | break; | |
3914 | case DW_OP_const2s: | |
3915 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3916 | data += 2; | |
3917 | fprintf_filtered (stream, " %s", plongest (l)); | |
3918 | break; | |
3919 | case DW_OP_const4u: | |
3920 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3921 | data += 4; | |
3922 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3923 | break; | |
3924 | case DW_OP_const4s: | |
3925 | l = extract_signed_integer (data, 4, gdbarch_byte_order (arch)); | |
3926 | data += 4; | |
3927 | fprintf_filtered (stream, " %s", plongest (l)); | |
3928 | break; | |
3929 | case DW_OP_const8u: | |
3930 | ul = extract_unsigned_integer (data, 8, gdbarch_byte_order (arch)); | |
3931 | data += 8; | |
3932 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3933 | break; | |
3934 | case DW_OP_const8s: | |
3935 | l = extract_signed_integer (data, 8, gdbarch_byte_order (arch)); | |
3936 | data += 8; | |
3937 | fprintf_filtered (stream, " %s", plongest (l)); | |
3938 | break; | |
3939 | case DW_OP_constu: | |
f664829e | 3940 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3941 | fprintf_filtered (stream, " %s", pulongest (ul)); |
3942 | break; | |
3943 | case DW_OP_consts: | |
f664829e | 3944 | data = safe_read_sleb128 (data, end, &l); |
9eae7c52 TT |
3945 | fprintf_filtered (stream, " %s", plongest (l)); |
3946 | break; | |
3947 | ||
3948 | case DW_OP_reg0: | |
3949 | case DW_OP_reg1: | |
3950 | case DW_OP_reg2: | |
3951 | case DW_OP_reg3: | |
3952 | case DW_OP_reg4: | |
3953 | case DW_OP_reg5: | |
3954 | case DW_OP_reg6: | |
3955 | case DW_OP_reg7: | |
3956 | case DW_OP_reg8: | |
3957 | case DW_OP_reg9: | |
3958 | case DW_OP_reg10: | |
3959 | case DW_OP_reg11: | |
3960 | case DW_OP_reg12: | |
3961 | case DW_OP_reg13: | |
3962 | case DW_OP_reg14: | |
3963 | case DW_OP_reg15: | |
3964 | case DW_OP_reg16: | |
3965 | case DW_OP_reg17: | |
3966 | case DW_OP_reg18: | |
3967 | case DW_OP_reg19: | |
3968 | case DW_OP_reg20: | |
3969 | case DW_OP_reg21: | |
3970 | case DW_OP_reg22: | |
3971 | case DW_OP_reg23: | |
3972 | case DW_OP_reg24: | |
3973 | case DW_OP_reg25: | |
3974 | case DW_OP_reg26: | |
3975 | case DW_OP_reg27: | |
3976 | case DW_OP_reg28: | |
3977 | case DW_OP_reg29: | |
3978 | case DW_OP_reg30: | |
3979 | case DW_OP_reg31: | |
3980 | fprintf_filtered (stream, " [$%s]", | |
5e44ecb3 | 3981 | locexpr_regname (arch, op - DW_OP_reg0)); |
9eae7c52 TT |
3982 | break; |
3983 | ||
3984 | case DW_OP_regx: | |
f664829e | 3985 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 | 3986 | fprintf_filtered (stream, " %s [$%s]", pulongest (ul), |
5e44ecb3 | 3987 | locexpr_regname (arch, (int) ul)); |
9eae7c52 TT |
3988 | break; |
3989 | ||
3990 | case DW_OP_implicit_value: | |
f664829e | 3991 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3992 | data += ul; |
3993 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3994 | break; | |
3995 | ||
3996 | case DW_OP_breg0: | |
3997 | case DW_OP_breg1: | |
3998 | case DW_OP_breg2: | |
3999 | case DW_OP_breg3: | |
4000 | case DW_OP_breg4: | |
4001 | case DW_OP_breg5: | |
4002 | case DW_OP_breg6: | |
4003 | case DW_OP_breg7: | |
4004 | case DW_OP_breg8: | |
4005 | case DW_OP_breg9: | |
4006 | case DW_OP_breg10: | |
4007 | case DW_OP_breg11: | |
4008 | case DW_OP_breg12: | |
4009 | case DW_OP_breg13: | |
4010 | case DW_OP_breg14: | |
4011 | case DW_OP_breg15: | |
4012 | case DW_OP_breg16: | |
4013 | case DW_OP_breg17: | |
4014 | case DW_OP_breg18: | |
4015 | case DW_OP_breg19: | |
4016 | case DW_OP_breg20: | |
4017 | case DW_OP_breg21: | |
4018 | case DW_OP_breg22: | |
4019 | case DW_OP_breg23: | |
4020 | case DW_OP_breg24: | |
4021 | case DW_OP_breg25: | |
4022 | case DW_OP_breg26: | |
4023 | case DW_OP_breg27: | |
4024 | case DW_OP_breg28: | |
4025 | case DW_OP_breg29: | |
4026 | case DW_OP_breg30: | |
4027 | case DW_OP_breg31: | |
f664829e | 4028 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 4029 | fprintf_filtered (stream, " %s [$%s]", plongest (l), |
5e44ecb3 | 4030 | locexpr_regname (arch, op - DW_OP_breg0)); |
9eae7c52 TT |
4031 | break; |
4032 | ||
4033 | case DW_OP_bregx: | |
f664829e DE |
4034 | data = safe_read_uleb128 (data, end, &ul); |
4035 | data = safe_read_sleb128 (data, end, &l); | |
0502ed8c JK |
4036 | fprintf_filtered (stream, " register %s [$%s] offset %s", |
4037 | pulongest (ul), | |
5e44ecb3 | 4038 | locexpr_regname (arch, (int) ul), |
0502ed8c | 4039 | plongest (l)); |
9eae7c52 TT |
4040 | break; |
4041 | ||
4042 | case DW_OP_fbreg: | |
f664829e | 4043 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 4044 | fprintf_filtered (stream, " %s", plongest (l)); |
9eae7c52 TT |
4045 | break; |
4046 | ||
4047 | case DW_OP_xderef_size: | |
4048 | case DW_OP_deref_size: | |
4049 | case DW_OP_pick: | |
4050 | fprintf_filtered (stream, " %d", *data); | |
4051 | ++data; | |
4052 | break; | |
4053 | ||
4054 | case DW_OP_plus_uconst: | |
f664829e | 4055 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4056 | fprintf_filtered (stream, " %s", pulongest (ul)); |
4057 | break; | |
4058 | ||
4059 | case DW_OP_skip: | |
4060 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4061 | data += 2; | |
4062 | fprintf_filtered (stream, " to %ld", | |
4063 | (long) (data + l - start)); | |
4064 | break; | |
4065 | ||
4066 | case DW_OP_bra: | |
4067 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4068 | data += 2; | |
4069 | fprintf_filtered (stream, " %ld", | |
4070 | (long) (data + l - start)); | |
4071 | break; | |
4072 | ||
4073 | case DW_OP_call2: | |
4074 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
4075 | data += 2; | |
4076 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 2)); | |
4077 | break; | |
4078 | ||
4079 | case DW_OP_call4: | |
4080 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4081 | data += 4; | |
4082 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4083 | break; | |
4084 | ||
4085 | case DW_OP_call_ref: | |
4086 | ul = extract_unsigned_integer (data, offset_size, | |
4087 | gdbarch_byte_order (arch)); | |
4088 | data += offset_size; | |
4089 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
4090 | break; | |
4091 | ||
4092 | case DW_OP_piece: | |
f664829e | 4093 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4094 | fprintf_filtered (stream, " %s (bytes)", pulongest (ul)); |
4095 | break; | |
4096 | ||
4097 | case DW_OP_bit_piece: | |
4098 | { | |
9fccedf7 | 4099 | uint64_t offset; |
9eae7c52 | 4100 | |
f664829e DE |
4101 | data = safe_read_uleb128 (data, end, &ul); |
4102 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4103 | fprintf_filtered (stream, " size %s offset %s (bits)", |
4104 | pulongest (ul), pulongest (offset)); | |
4105 | } | |
4106 | break; | |
8cf6f0b1 | 4107 | |
216f72a1 | 4108 | case DW_OP_implicit_pointer: |
8cf6f0b1 TT |
4109 | case DW_OP_GNU_implicit_pointer: |
4110 | { | |
4111 | ul = extract_unsigned_integer (data, offset_size, | |
4112 | gdbarch_byte_order (arch)); | |
4113 | data += offset_size; | |
4114 | ||
f664829e | 4115 | data = safe_read_sleb128 (data, end, &l); |
8cf6f0b1 TT |
4116 | |
4117 | fprintf_filtered (stream, " DIE %s offset %s", | |
4118 | phex_nz (ul, offset_size), | |
4119 | plongest (l)); | |
4120 | } | |
4121 | break; | |
5e44ecb3 | 4122 | |
216f72a1 | 4123 | case DW_OP_deref_type: |
5e44ecb3 TT |
4124 | case DW_OP_GNU_deref_type: |
4125 | { | |
b926417a | 4126 | int deref_addr_size = *data++; |
5e44ecb3 TT |
4127 | struct type *type; |
4128 | ||
f664829e | 4129 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4130 | cu_offset offset = (cu_offset) ul; |
5e44ecb3 TT |
4131 | type = dwarf2_get_die_type (offset, per_cu); |
4132 | fprintf_filtered (stream, "<"); | |
4133 | type_print (type, "", stream, -1); | |
9c541725 PA |
4134 | fprintf_filtered (stream, " [0x%s]> %d", |
4135 | phex_nz (to_underlying (offset), 0), | |
b926417a | 4136 | deref_addr_size); |
5e44ecb3 TT |
4137 | } |
4138 | break; | |
4139 | ||
216f72a1 | 4140 | case DW_OP_const_type: |
5e44ecb3 TT |
4141 | case DW_OP_GNU_const_type: |
4142 | { | |
5e44ecb3 TT |
4143 | struct type *type; |
4144 | ||
f664829e | 4145 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4146 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 TT |
4147 | type = dwarf2_get_die_type (type_die, per_cu); |
4148 | fprintf_filtered (stream, "<"); | |
4149 | type_print (type, "", stream, -1); | |
9c541725 PA |
4150 | fprintf_filtered (stream, " [0x%s]>", |
4151 | phex_nz (to_underlying (type_die), 0)); | |
d9e49b61 TT |
4152 | |
4153 | int n = *data++; | |
4154 | fprintf_filtered (stream, " %d byte block:", n); | |
4155 | for (int i = 0; i < n; ++i) | |
4156 | fprintf_filtered (stream, " %02x", data[i]); | |
4157 | data += n; | |
5e44ecb3 TT |
4158 | } |
4159 | break; | |
4160 | ||
216f72a1 | 4161 | case DW_OP_regval_type: |
5e44ecb3 TT |
4162 | case DW_OP_GNU_regval_type: |
4163 | { | |
9fccedf7 | 4164 | uint64_t reg; |
5e44ecb3 TT |
4165 | struct type *type; |
4166 | ||
f664829e DE |
4167 | data = safe_read_uleb128 (data, end, ®); |
4168 | data = safe_read_uleb128 (data, end, &ul); | |
9c541725 | 4169 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 TT |
4170 | |
4171 | type = dwarf2_get_die_type (type_die, per_cu); | |
4172 | fprintf_filtered (stream, "<"); | |
4173 | type_print (type, "", stream, -1); | |
b64f50a1 | 4174 | fprintf_filtered (stream, " [0x%s]> [$%s]", |
9c541725 | 4175 | phex_nz (to_underlying (type_die), 0), |
5e44ecb3 TT |
4176 | locexpr_regname (arch, reg)); |
4177 | } | |
4178 | break; | |
4179 | ||
216f72a1 | 4180 | case DW_OP_convert: |
5e44ecb3 | 4181 | case DW_OP_GNU_convert: |
216f72a1 | 4182 | case DW_OP_reinterpret: |
5e44ecb3 TT |
4183 | case DW_OP_GNU_reinterpret: |
4184 | { | |
f664829e | 4185 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4186 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 | 4187 | |
9c541725 | 4188 | if (to_underlying (type_die) == 0) |
5e44ecb3 TT |
4189 | fprintf_filtered (stream, "<0>"); |
4190 | else | |
4191 | { | |
4192 | struct type *type; | |
4193 | ||
4194 | type = dwarf2_get_die_type (type_die, per_cu); | |
4195 | fprintf_filtered (stream, "<"); | |
4196 | type_print (type, "", stream, -1); | |
9c541725 PA |
4197 | fprintf_filtered (stream, " [0x%s]>", |
4198 | phex_nz (to_underlying (type_die), 0)); | |
5e44ecb3 TT |
4199 | } |
4200 | } | |
4201 | break; | |
2bda9cc5 | 4202 | |
216f72a1 | 4203 | case DW_OP_entry_value: |
2bda9cc5 | 4204 | case DW_OP_GNU_entry_value: |
f664829e | 4205 | data = safe_read_uleb128 (data, end, &ul); |
2bda9cc5 JK |
4206 | fputc_filtered ('\n', stream); |
4207 | disassemble_dwarf_expression (stream, arch, addr_size, offset_size, | |
4208 | start, data, data + ul, indent + 2, | |
4209 | all, per_cu); | |
4210 | data += ul; | |
4211 | continue; | |
49f6c839 | 4212 | |
a24f71ab JK |
4213 | case DW_OP_GNU_parameter_ref: |
4214 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4215 | data += 4; | |
4216 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4217 | break; | |
4218 | ||
336d760d | 4219 | case DW_OP_addrx: |
49f6c839 DE |
4220 | case DW_OP_GNU_addr_index: |
4221 | data = safe_read_uleb128 (data, end, &ul); | |
4222 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4223 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); | |
4224 | break; | |
4225 | case DW_OP_GNU_const_index: | |
4226 | data = safe_read_uleb128 (data, end, &ul); | |
4227 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4228 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4229 | break; | |
a6b786da KB |
4230 | |
4231 | case DW_OP_GNU_variable_value: | |
4232 | ul = extract_unsigned_integer (data, offset_size, | |
4233 | gdbarch_byte_order (arch)); | |
4234 | data += offset_size; | |
4235 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
4236 | break; | |
9eae7c52 TT |
4237 | } |
4238 | ||
4239 | fprintf_filtered (stream, "\n"); | |
4240 | } | |
c3228f12 | 4241 | |
08922a10 | 4242 | return data; |
4c2df51b DJ |
4243 | } |
4244 | ||
009b64fc TT |
4245 | static bool dwarf_always_disassemble; |
4246 | ||
4247 | static void | |
4248 | show_dwarf_always_disassemble (struct ui_file *file, int from_tty, | |
4249 | struct cmd_list_element *c, const char *value) | |
4250 | { | |
4251 | fprintf_filtered (file, | |
4252 | _("Whether to always disassemble " | |
4253 | "DWARF expressions is %s.\n"), | |
4254 | value); | |
4255 | } | |
4256 | ||
08922a10 SS |
4257 | /* Describe a single location, which may in turn consist of multiple |
4258 | pieces. */ | |
a55cc764 | 4259 | |
08922a10 SS |
4260 | static void |
4261 | locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr, | |
0d45f56e | 4262 | struct ui_file *stream, |
56eb65bd | 4263 | const gdb_byte *data, size_t size, |
9eae7c52 | 4264 | struct objfile *objfile, unsigned int addr_size, |
5e44ecb3 | 4265 | int offset_size, struct dwarf2_per_cu_data *per_cu) |
08922a10 | 4266 | { |
0d45f56e | 4267 | const gdb_byte *end = data + size; |
9eae7c52 | 4268 | int first_piece = 1, bad = 0; |
08922a10 | 4269 | |
08922a10 SS |
4270 | while (data < end) |
4271 | { | |
9eae7c52 TT |
4272 | const gdb_byte *here = data; |
4273 | int disassemble = 1; | |
4274 | ||
4275 | if (first_piece) | |
4276 | first_piece = 0; | |
4277 | else | |
4278 | fprintf_filtered (stream, _(", and ")); | |
08922a10 | 4279 | |
b4f54984 | 4280 | if (!dwarf_always_disassemble) |
9eae7c52 | 4281 | { |
3e43a32a | 4282 | data = locexpr_describe_location_piece (symbol, stream, |
49f6c839 | 4283 | addr, objfile, per_cu, |
9eae7c52 TT |
4284 | data, end, addr_size); |
4285 | /* If we printed anything, or if we have an empty piece, | |
4286 | then don't disassemble. */ | |
4287 | if (data != here | |
4288 | || data[0] == DW_OP_piece | |
4289 | || data[0] == DW_OP_bit_piece) | |
4290 | disassemble = 0; | |
08922a10 | 4291 | } |
9eae7c52 | 4292 | if (disassemble) |
2bda9cc5 JK |
4293 | { |
4294 | fprintf_filtered (stream, _("a complex DWARF expression:\n")); | |
4295 | data = disassemble_dwarf_expression (stream, | |
08feed99 | 4296 | objfile->arch (), |
2bda9cc5 JK |
4297 | addr_size, offset_size, data, |
4298 | data, end, 0, | |
b4f54984 | 4299 | dwarf_always_disassemble, |
2bda9cc5 JK |
4300 | per_cu); |
4301 | } | |
9eae7c52 TT |
4302 | |
4303 | if (data < end) | |
08922a10 | 4304 | { |
9eae7c52 | 4305 | int empty = data == here; |
08922a10 | 4306 | |
9eae7c52 TT |
4307 | if (disassemble) |
4308 | fprintf_filtered (stream, " "); | |
4309 | if (data[0] == DW_OP_piece) | |
4310 | { | |
9fccedf7 | 4311 | uint64_t bytes; |
08922a10 | 4312 | |
f664829e | 4313 | data = safe_read_uleb128 (data + 1, end, &bytes); |
08922a10 | 4314 | |
9eae7c52 TT |
4315 | if (empty) |
4316 | fprintf_filtered (stream, _("an empty %s-byte piece"), | |
4317 | pulongest (bytes)); | |
4318 | else | |
4319 | fprintf_filtered (stream, _(" [%s-byte piece]"), | |
4320 | pulongest (bytes)); | |
4321 | } | |
4322 | else if (data[0] == DW_OP_bit_piece) | |
4323 | { | |
9fccedf7 | 4324 | uint64_t bits, offset; |
9eae7c52 | 4325 | |
f664829e DE |
4326 | data = safe_read_uleb128 (data + 1, end, &bits); |
4327 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4328 | |
4329 | if (empty) | |
4330 | fprintf_filtered (stream, | |
4331 | _("an empty %s-bit piece"), | |
4332 | pulongest (bits)); | |
4333 | else | |
4334 | fprintf_filtered (stream, | |
4335 | _(" [%s-bit piece, offset %s bits]"), | |
4336 | pulongest (bits), pulongest (offset)); | |
4337 | } | |
4338 | else | |
4339 | { | |
4340 | bad = 1; | |
4341 | break; | |
4342 | } | |
08922a10 SS |
4343 | } |
4344 | } | |
4345 | ||
4346 | if (bad || data > end) | |
4347 | error (_("Corrupted DWARF2 expression for \"%s\"."), | |
987012b8 | 4348 | symbol->print_name ()); |
08922a10 SS |
4349 | } |
4350 | ||
4351 | /* Print a natural-language description of SYMBOL to STREAM. This | |
4352 | version is for a symbol with a single location. */ | |
a55cc764 | 4353 | |
08922a10 SS |
4354 | static void |
4355 | locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4356 | struct ui_file *stream) | |
4357 | { | |
9a3c8263 SM |
4358 | struct dwarf2_locexpr_baton *dlbaton |
4359 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
a50264ba TT |
4360 | dwarf2_per_objfile *per_objfile = dlbaton->per_objfile; |
4361 | struct objfile *objfile = per_objfile->objfile; | |
09ba997f TT |
4362 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
4363 | int offset_size = dlbaton->per_cu->offset_size (); | |
08922a10 | 4364 | |
3e43a32a MS |
4365 | locexpr_describe_location_1 (symbol, addr, stream, |
4366 | dlbaton->data, dlbaton->size, | |
5e44ecb3 TT |
4367 | objfile, addr_size, offset_size, |
4368 | dlbaton->per_cu); | |
08922a10 SS |
4369 | } |
4370 | ||
4371 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4372 | any necessary bytecode in AX. */ | |
a55cc764 | 4373 | |
0d53c4c4 | 4374 | static void |
40f4af28 SM |
4375 | locexpr_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax, |
4376 | struct axs_value *value) | |
a55cc764 | 4377 | { |
9a3c8263 SM |
4378 | struct dwarf2_locexpr_baton *dlbaton |
4379 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
09ba997f | 4380 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
a55cc764 | 4381 | |
1d6edc3c | 4382 | if (dlbaton->size == 0) |
cabe9ab6 PA |
4383 | value->optimized_out = 1; |
4384 | else | |
40f4af28 SM |
4385 | dwarf2_compile_expr_to_ax (ax, value, addr_size, dlbaton->data, |
4386 | dlbaton->data + dlbaton->size, dlbaton->per_cu); | |
a55cc764 DJ |
4387 | } |
4388 | ||
bb2ec1b3 TT |
4389 | /* symbol_computed_ops 'generate_c_location' method. */ |
4390 | ||
4391 | static void | |
d82b3862 | 4392 | locexpr_generate_c_location (struct symbol *sym, string_file *stream, |
bb2ec1b3 TT |
4393 | struct gdbarch *gdbarch, |
4394 | unsigned char *registers_used, | |
4395 | CORE_ADDR pc, const char *result_name) | |
4396 | { | |
9a3c8263 SM |
4397 | struct dwarf2_locexpr_baton *dlbaton |
4398 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (sym); | |
09ba997f | 4399 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
bb2ec1b3 TT |
4400 | |
4401 | if (dlbaton->size == 0) | |
987012b8 | 4402 | error (_("symbol \"%s\" is optimized out"), sym->natural_name ()); |
bb2ec1b3 TT |
4403 | |
4404 | compile_dwarf_expr_to_c (stream, result_name, | |
4405 | sym, pc, gdbarch, registers_used, addr_size, | |
4406 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4407 | dlbaton->per_cu); | |
4408 | } | |
4409 | ||
4c2df51b DJ |
4410 | /* The set of location functions used with the DWARF-2 expression |
4411 | evaluator. */ | |
768a979c | 4412 | const struct symbol_computed_ops dwarf2_locexpr_funcs = { |
4c2df51b | 4413 | locexpr_read_variable, |
e18b2753 | 4414 | locexpr_read_variable_at_entry, |
0b31a4bc | 4415 | locexpr_get_symbol_read_needs, |
4c2df51b | 4416 | locexpr_describe_location, |
f1e6e072 | 4417 | 0, /* location_has_loclist */ |
bb2ec1b3 TT |
4418 | locexpr_tracepoint_var_ref, |
4419 | locexpr_generate_c_location | |
4c2df51b | 4420 | }; |
0d53c4c4 DJ |
4421 | |
4422 | ||
4423 | /* Wrapper functions for location lists. These generally find | |
4424 | the appropriate location expression and call something above. */ | |
4425 | ||
4426 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
4427 | evaluator to calculate the location. */ | |
4428 | static struct value * | |
4429 | loclist_read_variable (struct symbol *symbol, struct frame_info *frame) | |
4430 | { | |
9a3c8263 SM |
4431 | struct dwarf2_loclist_baton *dlbaton |
4432 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
0d53c4c4 | 4433 | struct value *val; |
947bb88f | 4434 | const gdb_byte *data; |
b6b08ebf | 4435 | size_t size; |
8cf6f0b1 | 4436 | CORE_ADDR pc = frame ? get_frame_address_in_block (frame) : 0; |
0d53c4c4 | 4437 | |
8cf6f0b1 | 4438 | data = dwarf2_find_location_expression (dlbaton, &size, pc); |
1d6edc3c JK |
4439 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, data, size, |
4440 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4441 | |
4442 | return val; | |
4443 | } | |
4444 | ||
e18b2753 JK |
4445 | /* Read variable SYMBOL like loclist_read_variable at (callee) FRAME's function |
4446 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
4447 | will be thrown. | |
4448 | ||
4449 | Function always returns non-NULL value, it may be marked optimized out if | |
4450 | inferior frame information is not available. It throws NO_ENTRY_VALUE_ERROR | |
4451 | if it cannot resolve the parameter for any reason. */ | |
4452 | ||
4453 | static struct value * | |
4454 | loclist_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
4455 | { | |
9a3c8263 SM |
4456 | struct dwarf2_loclist_baton *dlbaton |
4457 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
4458 | const gdb_byte *data; |
4459 | size_t size; | |
4460 | CORE_ADDR pc; | |
4461 | ||
4462 | if (frame == NULL || !get_frame_func_if_available (frame, &pc)) | |
4463 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4464 | ||
4465 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4466 | if (data == NULL) | |
4467 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4468 | ||
4469 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, data, size); | |
4470 | } | |
4471 | ||
0b31a4bc TT |
4472 | /* Implementation of get_symbol_read_needs from |
4473 | symbol_computed_ops. */ | |
4474 | ||
4475 | static enum symbol_needs_kind | |
4476 | loclist_symbol_needs (struct symbol *symbol) | |
0d53c4c4 DJ |
4477 | { |
4478 | /* If there's a location list, then assume we need to have a frame | |
4479 | to choose the appropriate location expression. With tracking of | |
4480 | global variables this is not necessarily true, but such tracking | |
4481 | is disabled in GCC at the moment until we figure out how to | |
4482 | represent it. */ | |
4483 | ||
0b31a4bc | 4484 | return SYMBOL_NEEDS_FRAME; |
0d53c4c4 DJ |
4485 | } |
4486 | ||
08922a10 SS |
4487 | /* Print a natural-language description of SYMBOL to STREAM. This |
4488 | version applies when there is a list of different locations, each | |
4489 | with a specified address range. */ | |
4490 | ||
4491 | static void | |
4492 | loclist_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4493 | struct ui_file *stream) | |
0d53c4c4 | 4494 | { |
9a3c8263 SM |
4495 | struct dwarf2_loclist_baton *dlbaton |
4496 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4497 | const gdb_byte *loc_ptr, *buf_end; |
a50264ba TT |
4498 | dwarf2_per_objfile *per_objfile = dlbaton->per_objfile; |
4499 | struct objfile *objfile = per_objfile->objfile; | |
08feed99 | 4500 | struct gdbarch *gdbarch = objfile->arch (); |
08922a10 | 4501 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
09ba997f TT |
4502 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
4503 | int offset_size = dlbaton->per_cu->offset_size (); | |
d4a087c7 | 4504 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
08922a10 | 4505 | /* Adjust base_address for relocatable objects. */ |
09ba997f | 4506 | CORE_ADDR base_offset = dlbaton->per_cu->text_offset (); |
08922a10 | 4507 | CORE_ADDR base_address = dlbaton->base_address + base_offset; |
f664829e | 4508 | int done = 0; |
08922a10 SS |
4509 | |
4510 | loc_ptr = dlbaton->data; | |
4511 | buf_end = dlbaton->data + dlbaton->size; | |
4512 | ||
9eae7c52 | 4513 | fprintf_filtered (stream, _("multi-location:\n")); |
08922a10 SS |
4514 | |
4515 | /* Iterate through locations until we run out. */ | |
f664829e | 4516 | while (!done) |
08922a10 | 4517 | { |
f664829e DE |
4518 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
4519 | int length; | |
4520 | enum debug_loc_kind kind; | |
4521 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
4522 | ||
85a9510c | 4523 | if (dlbaton->per_cu->version () < 5 && dlbaton->from_dwo) |
f664829e DE |
4524 | kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu, |
4525 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 4526 | &low, &high, byte_order); |
85a9510c | 4527 | else if (dlbaton->per_cu->version () < 5) |
f664829e DE |
4528 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
4529 | &low, &high, | |
4530 | byte_order, addr_size, | |
4531 | signed_addr_p); | |
85a9510c | 4532 | else |
4533 | kind = decode_debug_loclists_addresses (dlbaton->per_cu, | |
4534 | loc_ptr, buf_end, &new_ptr, | |
4535 | &low, &high, byte_order, | |
4536 | addr_size, signed_addr_p); | |
f664829e DE |
4537 | loc_ptr = new_ptr; |
4538 | switch (kind) | |
08922a10 | 4539 | { |
f664829e DE |
4540 | case DEBUG_LOC_END_OF_LIST: |
4541 | done = 1; | |
4542 | continue; | |
4543 | case DEBUG_LOC_BASE_ADDRESS: | |
d4a087c7 | 4544 | base_address = high + base_offset; |
9eae7c52 | 4545 | fprintf_filtered (stream, _(" Base address %s"), |
08922a10 | 4546 | paddress (gdbarch, base_address)); |
08922a10 | 4547 | continue; |
3771a44c DE |
4548 | case DEBUG_LOC_START_END: |
4549 | case DEBUG_LOC_START_LENGTH: | |
85a9510c | 4550 | case DEBUG_LOC_OFFSET_PAIR: |
f664829e DE |
4551 | break; |
4552 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
4553 | case DEBUG_LOC_INVALID_ENTRY: | |
4554 | error (_("Corrupted DWARF expression for symbol \"%s\"."), | |
987012b8 | 4555 | symbol->print_name ()); |
f664829e DE |
4556 | default: |
4557 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
08922a10 SS |
4558 | } |
4559 | ||
08922a10 SS |
4560 | /* Otherwise, a location expression entry. */ |
4561 | low += base_address; | |
4562 | high += base_address; | |
4563 | ||
3e29f34a MR |
4564 | low = gdbarch_adjust_dwarf2_addr (gdbarch, low); |
4565 | high = gdbarch_adjust_dwarf2_addr (gdbarch, high); | |
4566 | ||
85a9510c | 4567 | if (dlbaton->per_cu->version () < 5) |
4568 | { | |
4569 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); | |
4570 | loc_ptr += 2; | |
4571 | } | |
4572 | else | |
4573 | { | |
4574 | unsigned int bytes_read; | |
4575 | length = read_unsigned_leb128 (NULL, loc_ptr, &bytes_read); | |
4576 | loc_ptr += bytes_read; | |
4577 | } | |
08922a10 | 4578 | |
08922a10 SS |
4579 | /* (It would improve readability to print only the minimum |
4580 | necessary digits of the second number of the range.) */ | |
9eae7c52 | 4581 | fprintf_filtered (stream, _(" Range %s-%s: "), |
08922a10 SS |
4582 | paddress (gdbarch, low), paddress (gdbarch, high)); |
4583 | ||
4584 | /* Now describe this particular location. */ | |
4585 | locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length, | |
5e44ecb3 TT |
4586 | objfile, addr_size, offset_size, |
4587 | dlbaton->per_cu); | |
9eae7c52 TT |
4588 | |
4589 | fprintf_filtered (stream, "\n"); | |
08922a10 SS |
4590 | |
4591 | loc_ptr += length; | |
4592 | } | |
0d53c4c4 DJ |
4593 | } |
4594 | ||
4595 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4596 | any necessary bytecode in AX. */ | |
4597 | static void | |
40f4af28 SM |
4598 | loclist_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax, |
4599 | struct axs_value *value) | |
0d53c4c4 | 4600 | { |
9a3c8263 SM |
4601 | struct dwarf2_loclist_baton *dlbaton |
4602 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4603 | const gdb_byte *data; |
b6b08ebf | 4604 | size_t size; |
09ba997f | 4605 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
0d53c4c4 | 4606 | |
8cf6f0b1 | 4607 | data = dwarf2_find_location_expression (dlbaton, &size, ax->scope); |
1d6edc3c | 4608 | if (size == 0) |
cabe9ab6 PA |
4609 | value->optimized_out = 1; |
4610 | else | |
40f4af28 | 4611 | dwarf2_compile_expr_to_ax (ax, value, addr_size, data, data + size, |
9f6f94ff | 4612 | dlbaton->per_cu); |
0d53c4c4 DJ |
4613 | } |
4614 | ||
bb2ec1b3 TT |
4615 | /* symbol_computed_ops 'generate_c_location' method. */ |
4616 | ||
4617 | static void | |
d82b3862 | 4618 | loclist_generate_c_location (struct symbol *sym, string_file *stream, |
bb2ec1b3 TT |
4619 | struct gdbarch *gdbarch, |
4620 | unsigned char *registers_used, | |
4621 | CORE_ADDR pc, const char *result_name) | |
4622 | { | |
9a3c8263 SM |
4623 | struct dwarf2_loclist_baton *dlbaton |
4624 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (sym); | |
09ba997f | 4625 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
bb2ec1b3 TT |
4626 | const gdb_byte *data; |
4627 | size_t size; | |
4628 | ||
4629 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4630 | if (size == 0) | |
987012b8 | 4631 | error (_("symbol \"%s\" is optimized out"), sym->natural_name ()); |
bb2ec1b3 TT |
4632 | |
4633 | compile_dwarf_expr_to_c (stream, result_name, | |
4634 | sym, pc, gdbarch, registers_used, addr_size, | |
4635 | data, data + size, | |
4636 | dlbaton->per_cu); | |
4637 | } | |
4638 | ||
0d53c4c4 DJ |
4639 | /* The set of location functions used with the DWARF-2 expression |
4640 | evaluator and location lists. */ | |
768a979c | 4641 | const struct symbol_computed_ops dwarf2_loclist_funcs = { |
0d53c4c4 | 4642 | loclist_read_variable, |
e18b2753 | 4643 | loclist_read_variable_at_entry, |
0b31a4bc | 4644 | loclist_symbol_needs, |
0d53c4c4 | 4645 | loclist_describe_location, |
f1e6e072 | 4646 | 1, /* location_has_loclist */ |
bb2ec1b3 TT |
4647 | loclist_tracepoint_var_ref, |
4648 | loclist_generate_c_location | |
0d53c4c4 | 4649 | }; |
8e3b41a9 | 4650 | |
6c265988 | 4651 | void _initialize_dwarf2loc (); |
8e3b41a9 | 4652 | void |
6c265988 | 4653 | _initialize_dwarf2loc () |
8e3b41a9 | 4654 | { |
ccce17b0 YQ |
4655 | add_setshow_zuinteger_cmd ("entry-values", class_maintenance, |
4656 | &entry_values_debug, | |
4657 | _("Set entry values and tail call frames " | |
4658 | "debugging."), | |
4659 | _("Show entry values and tail call frames " | |
4660 | "debugging."), | |
4661 | _("When non-zero, the process of determining " | |
4662 | "parameter values from function entry point " | |
4663 | "and tail call frames will be printed."), | |
4664 | NULL, | |
4665 | show_entry_values_debug, | |
4666 | &setdebuglist, &showdebuglist); | |
009b64fc TT |
4667 | |
4668 | add_setshow_boolean_cmd ("always-disassemble", class_obscure, | |
4669 | &dwarf_always_disassemble, _("\ | |
4670 | Set whether `info address' always disassembles DWARF expressions."), _("\ | |
4671 | Show whether `info address' always disassembles DWARF expressions."), _("\ | |
4672 | When enabled, DWARF expressions are always printed in an assembly-like\n\ | |
4673 | syntax. When disabled, expressions will be printed in a more\n\ | |
4674 | conversational style, when possible."), | |
4675 | NULL, | |
4676 | show_dwarf_always_disassemble, | |
4677 | &set_dwarf_cmdlist, | |
4678 | &show_dwarf_cmdlist); | |
8e3b41a9 | 4679 | } |