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4c2df51b | 1 | /* DWARF 2 location expression support for GDB. |
feb13ab0 | 2 | |
4a94e368 | 3 | Copyright (C) 2003-2022 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 | |
9f47c707 SM |
50 | static struct value *dwarf2_evaluate_loc_desc_full |
51 | (struct type *type, struct frame_info *frame, const gdb_byte *data, | |
52 | size_t size, dwarf2_per_cu_data *per_cu, dwarf2_per_objfile *per_objfile, | |
70454ee7 | 53 | struct type *subobj_type, LONGEST subobj_byte_offset, bool as_lval = true); |
8cf6f0b1 | 54 | |
f664829e DE |
55 | /* Until these have formal names, we define these here. |
56 | ref: http://gcc.gnu.org/wiki/DebugFission | |
57 | Each entry in .debug_loc.dwo begins with a byte that describes the entry, | |
58 | and is then followed by data specific to that entry. */ | |
59 | ||
60 | enum debug_loc_kind | |
61 | { | |
62 | /* Indicates the end of the list of entries. */ | |
63 | DEBUG_LOC_END_OF_LIST = 0, | |
64 | ||
65 | /* This is followed by an unsigned LEB128 number that is an index into | |
66 | .debug_addr and specifies the base address for all following entries. */ | |
67 | DEBUG_LOC_BASE_ADDRESS = 1, | |
68 | ||
69 | /* This is followed by two unsigned LEB128 numbers that are indices into | |
70 | .debug_addr and specify the beginning and ending addresses, and then | |
71 | a normal location expression as in .debug_loc. */ | |
3771a44c DE |
72 | DEBUG_LOC_START_END = 2, |
73 | ||
74 | /* This is followed by an unsigned LEB128 number that is an index into | |
75 | .debug_addr and specifies the beginning address, and a 4 byte unsigned | |
76 | number that specifies the length, and then a normal location expression | |
77 | as in .debug_loc. */ | |
78 | DEBUG_LOC_START_LENGTH = 3, | |
f664829e | 79 | |
9fc3eaae | 80 | /* This is followed by two unsigned LEB128 operands. The values of these |
81 | operands are the starting and ending offsets, respectively, relative to | |
82 | the applicable base address. */ | |
83 | DEBUG_LOC_OFFSET_PAIR = 4, | |
84 | ||
f664829e DE |
85 | /* An internal value indicating there is insufficient data. */ |
86 | DEBUG_LOC_BUFFER_OVERFLOW = -1, | |
87 | ||
88 | /* An internal value indicating an invalid kind of entry was found. */ | |
89 | DEBUG_LOC_INVALID_ENTRY = -2 | |
90 | }; | |
91 | ||
b6807d98 TT |
92 | /* Helper function which throws an error if a synthetic pointer is |
93 | invalid. */ | |
94 | ||
ba5bc3e5 | 95 | void |
b6807d98 TT |
96 | invalid_synthetic_pointer (void) |
97 | { | |
98 | error (_("access outside bounds of object " | |
99 | "referenced via synthetic pointer")); | |
100 | } | |
101 | ||
f664829e DE |
102 | /* Decode the addresses in a non-dwo .debug_loc entry. |
103 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
104 | The encoded low,high addresses are return in *LOW,*HIGH. | |
105 | The result indicates the kind of entry found. */ | |
106 | ||
107 | static enum debug_loc_kind | |
108 | decode_debug_loc_addresses (const gdb_byte *loc_ptr, const gdb_byte *buf_end, | |
109 | const gdb_byte **new_ptr, | |
110 | CORE_ADDR *low, CORE_ADDR *high, | |
111 | enum bfd_endian byte_order, | |
112 | unsigned int addr_size, | |
113 | int signed_addr_p) | |
114 | { | |
115 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); | |
116 | ||
117 | if (buf_end - loc_ptr < 2 * addr_size) | |
118 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
119 | ||
120 | if (signed_addr_p) | |
121 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
122 | else | |
123 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
124 | loc_ptr += addr_size; | |
125 | ||
126 | if (signed_addr_p) | |
127 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
128 | else | |
129 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
130 | loc_ptr += addr_size; | |
131 | ||
132 | *new_ptr = loc_ptr; | |
133 | ||
134 | /* A base-address-selection entry. */ | |
135 | if ((*low & base_mask) == base_mask) | |
136 | return DEBUG_LOC_BASE_ADDRESS; | |
137 | ||
138 | /* An end-of-list entry. */ | |
139 | if (*low == 0 && *high == 0) | |
140 | return DEBUG_LOC_END_OF_LIST; | |
141 | ||
7b9f73fa TT |
142 | /* We want the caller to apply the base address, so we must return |
143 | DEBUG_LOC_OFFSET_PAIR here. */ | |
144 | return DEBUG_LOC_OFFSET_PAIR; | |
f664829e DE |
145 | } |
146 | ||
43988095 JK |
147 | /* Decode the addresses in .debug_loclists entry. |
148 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
149 | The encoded low,high addresses are return in *LOW,*HIGH. | |
150 | The result indicates the kind of entry found. */ | |
151 | ||
152 | static enum debug_loc_kind | |
82ca3f51 SM |
153 | decode_debug_loclists_addresses (dwarf2_per_cu_data *per_cu, |
154 | dwarf2_per_objfile *per_objfile, | |
43988095 JK |
155 | const gdb_byte *loc_ptr, |
156 | const gdb_byte *buf_end, | |
157 | const gdb_byte **new_ptr, | |
158 | CORE_ADDR *low, CORE_ADDR *high, | |
159 | enum bfd_endian byte_order, | |
160 | unsigned int addr_size, | |
161 | int signed_addr_p) | |
162 | { | |
163 | uint64_t u64; | |
164 | ||
165 | if (loc_ptr == buf_end) | |
166 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
167 | ||
168 | switch (*loc_ptr++) | |
169 | { | |
3112ed97 NA |
170 | case DW_LLE_base_addressx: |
171 | *low = 0; | |
172 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
173 | if (loc_ptr == NULL) | |
174 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
1fb5ee62 | 175 | |
82ca3f51 | 176 | *high = dwarf2_read_addr_index (per_cu, per_objfile, u64); |
3112ed97 NA |
177 | *new_ptr = loc_ptr; |
178 | return DEBUG_LOC_BASE_ADDRESS; | |
1fb5ee62 | 179 | |
3112ed97 NA |
180 | case DW_LLE_startx_length: |
181 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
182 | if (loc_ptr == NULL) | |
183 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
1fb5ee62 | 184 | |
82ca3f51 | 185 | *low = dwarf2_read_addr_index (per_cu, per_objfile, u64); |
3112ed97 NA |
186 | *high = *low; |
187 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
188 | if (loc_ptr == NULL) | |
189 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
1fb5ee62 | 190 | |
3112ed97 NA |
191 | *high += u64; |
192 | *new_ptr = loc_ptr; | |
193 | return DEBUG_LOC_START_LENGTH; | |
1fb5ee62 | 194 | |
3112ed97 NA |
195 | case DW_LLE_start_length: |
196 | if (buf_end - loc_ptr < addr_size) | |
197 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
1fb5ee62 | 198 | |
3112ed97 NA |
199 | if (signed_addr_p) |
200 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
201 | else | |
202 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
1fb5ee62 | 203 | |
3112ed97 NA |
204 | loc_ptr += addr_size; |
205 | *high = *low; | |
1fb5ee62 | 206 | |
3112ed97 NA |
207 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); |
208 | if (loc_ptr == NULL) | |
209 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
1fb5ee62 | 210 | |
3112ed97 NA |
211 | *high += u64; |
212 | *new_ptr = loc_ptr; | |
213 | return DEBUG_LOC_START_LENGTH; | |
1fb5ee62 | 214 | |
43988095 JK |
215 | case DW_LLE_end_of_list: |
216 | *new_ptr = loc_ptr; | |
217 | return DEBUG_LOC_END_OF_LIST; | |
1fb5ee62 | 218 | |
43988095 JK |
219 | case DW_LLE_base_address: |
220 | if (loc_ptr + addr_size > buf_end) | |
221 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
1fb5ee62 | 222 | |
43988095 JK |
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); | |
1fb5ee62 | 227 | |
43988095 JK |
228 | loc_ptr += addr_size; |
229 | *new_ptr = loc_ptr; | |
230 | return DEBUG_LOC_BASE_ADDRESS; | |
1fb5ee62 | 231 | |
43988095 JK |
232 | case DW_LLE_offset_pair: |
233 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
234 | if (loc_ptr == NULL) | |
235 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
1fb5ee62 | 236 | |
43988095 JK |
237 | *low = u64; |
238 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
239 | if (loc_ptr == NULL) | |
240 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
1fb5ee62 | 241 | |
43988095 JK |
242 | *high = u64; |
243 | *new_ptr = loc_ptr; | |
9fc3eaae | 244 | return DEBUG_LOC_OFFSET_PAIR; |
1fb5ee62 | 245 | |
80d1206d AS |
246 | case DW_LLE_start_end: |
247 | if (loc_ptr + 2 * addr_size > buf_end) | |
248 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
249 | ||
250 | if (signed_addr_p) | |
251 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
252 | else | |
253 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
254 | ||
255 | loc_ptr += addr_size; | |
256 | if (signed_addr_p) | |
257 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
258 | else | |
259 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
260 | ||
261 | loc_ptr += addr_size; | |
262 | *new_ptr = loc_ptr; | |
263 | return DEBUG_LOC_START_END; | |
264 | ||
3112ed97 NA |
265 | /* Following cases are not supported yet. */ |
266 | case DW_LLE_startx_endx: | |
3112ed97 | 267 | case DW_LLE_default_location: |
43988095 JK |
268 | default: |
269 | return DEBUG_LOC_INVALID_ENTRY; | |
270 | } | |
271 | } | |
272 | ||
f664829e DE |
273 | /* Decode the addresses in .debug_loc.dwo entry. |
274 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
275 | The encoded low,high addresses are return in *LOW,*HIGH. | |
276 | The result indicates the kind of entry found. */ | |
277 | ||
278 | static enum debug_loc_kind | |
82ca3f51 SM |
279 | decode_debug_loc_dwo_addresses (dwarf2_per_cu_data *per_cu, |
280 | dwarf2_per_objfile *per_objfile, | |
f664829e DE |
281 | const gdb_byte *loc_ptr, |
282 | const gdb_byte *buf_end, | |
283 | const gdb_byte **new_ptr, | |
3771a44c DE |
284 | CORE_ADDR *low, CORE_ADDR *high, |
285 | enum bfd_endian byte_order) | |
f664829e | 286 | { |
9fccedf7 | 287 | uint64_t low_index, high_index; |
f664829e DE |
288 | |
289 | if (loc_ptr == buf_end) | |
290 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
291 | ||
292 | switch (*loc_ptr++) | |
293 | { | |
43988095 | 294 | case DW_LLE_GNU_end_of_list_entry: |
f664829e DE |
295 | *new_ptr = loc_ptr; |
296 | return DEBUG_LOC_END_OF_LIST; | |
fc3ecb3e | 297 | |
43988095 | 298 | case DW_LLE_GNU_base_address_selection_entry: |
f664829e DE |
299 | *low = 0; |
300 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
301 | if (loc_ptr == NULL) | |
302 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
fc3ecb3e | 303 | |
82ca3f51 | 304 | *high = dwarf2_read_addr_index (per_cu, per_objfile, high_index); |
f664829e DE |
305 | *new_ptr = loc_ptr; |
306 | return DEBUG_LOC_BASE_ADDRESS; | |
fc3ecb3e | 307 | |
43988095 | 308 | case DW_LLE_GNU_start_end_entry: |
f664829e DE |
309 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
310 | if (loc_ptr == NULL) | |
311 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
fc3ecb3e | 312 | |
82ca3f51 | 313 | *low = dwarf2_read_addr_index (per_cu, per_objfile, low_index); |
f664829e DE |
314 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); |
315 | if (loc_ptr == NULL) | |
316 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
fc3ecb3e | 317 | |
82ca3f51 | 318 | *high = dwarf2_read_addr_index (per_cu, per_objfile, high_index); |
f664829e | 319 | *new_ptr = loc_ptr; |
3771a44c | 320 | return DEBUG_LOC_START_END; |
fc3ecb3e | 321 | |
43988095 | 322 | case DW_LLE_GNU_start_length_entry: |
3771a44c DE |
323 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
324 | if (loc_ptr == NULL) | |
325 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
fc3ecb3e | 326 | |
82ca3f51 | 327 | *low = dwarf2_read_addr_index (per_cu, per_objfile, low_index); |
3771a44c DE |
328 | if (loc_ptr + 4 > buf_end) |
329 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
fc3ecb3e | 330 | |
3771a44c DE |
331 | *high = *low; |
332 | *high += extract_unsigned_integer (loc_ptr, 4, byte_order); | |
333 | *new_ptr = loc_ptr + 4; | |
334 | return DEBUG_LOC_START_LENGTH; | |
fc3ecb3e | 335 | |
f664829e DE |
336 | default: |
337 | return DEBUG_LOC_INVALID_ENTRY; | |
338 | } | |
339 | } | |
340 | ||
8cf6f0b1 | 341 | /* A function for dealing with location lists. Given a |
0d53c4c4 DJ |
342 | symbol baton (BATON) and a pc value (PC), find the appropriate |
343 | location expression, set *LOCEXPR_LENGTH, and return a pointer | |
344 | to the beginning of the expression. Returns NULL on failure. | |
345 | ||
346 | For now, only return the first matching location expression; there | |
347 | can be more than one in the list. */ | |
348 | ||
8cf6f0b1 TT |
349 | const gdb_byte * |
350 | dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton, | |
351 | size_t *locexpr_length, CORE_ADDR pc) | |
0d53c4c4 | 352 | { |
a50264ba TT |
353 | dwarf2_per_objfile *per_objfile = baton->per_objfile; |
354 | struct objfile *objfile = per_objfile->objfile; | |
08feed99 | 355 | struct gdbarch *gdbarch = objfile->arch (); |
e17a4113 | 356 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
09ba997f | 357 | unsigned int addr_size = baton->per_cu->addr_size (); |
98badbfd | 358 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd.get ()); |
0c7af292 TT |
359 | /* Adjustment for relocatable objects. */ |
360 | CORE_ADDR text_offset = baton->per_objfile->objfile->text_section_offset (); | |
361 | CORE_ADDR base_address = baton->base_address; | |
f664829e | 362 | const gdb_byte *loc_ptr, *buf_end; |
0d53c4c4 DJ |
363 | |
364 | loc_ptr = baton->data; | |
365 | buf_end = baton->data + baton->size; | |
366 | ||
367 | while (1) | |
368 | { | |
f664829e DE |
369 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
370 | int length; | |
371 | enum debug_loc_kind kind; | |
372 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
373 | ||
9fc3eaae | 374 | if (baton->per_cu->version () < 5 && baton->from_dwo) |
f664829e | 375 | kind = decode_debug_loc_dwo_addresses (baton->per_cu, |
82ca3f51 | 376 | baton->per_objfile, |
f664829e | 377 | loc_ptr, buf_end, &new_ptr, |
3771a44c | 378 | &low, &high, byte_order); |
09ba997f | 379 | else if (baton->per_cu->version () < 5) |
f664829e DE |
380 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
381 | &low, &high, | |
382 | byte_order, addr_size, | |
383 | signed_addr_p); | |
43988095 JK |
384 | else |
385 | kind = decode_debug_loclists_addresses (baton->per_cu, | |
82ca3f51 | 386 | baton->per_objfile, |
43988095 JK |
387 | loc_ptr, buf_end, &new_ptr, |
388 | &low, &high, byte_order, | |
389 | addr_size, signed_addr_p); | |
390 | ||
f664829e DE |
391 | loc_ptr = new_ptr; |
392 | switch (kind) | |
1d6edc3c | 393 | { |
f664829e | 394 | case DEBUG_LOC_END_OF_LIST: |
1d6edc3c JK |
395 | *locexpr_length = 0; |
396 | return NULL; | |
fc3ecb3e | 397 | |
f664829e | 398 | case DEBUG_LOC_BASE_ADDRESS: |
0c7af292 | 399 | base_address = high; |
f664829e | 400 | continue; |
fc3ecb3e | 401 | |
3771a44c DE |
402 | case DEBUG_LOC_START_END: |
403 | case DEBUG_LOC_START_LENGTH: | |
9fc3eaae | 404 | case DEBUG_LOC_OFFSET_PAIR: |
f664829e | 405 | break; |
fc3ecb3e | 406 | |
f664829e DE |
407 | case DEBUG_LOC_BUFFER_OVERFLOW: |
408 | case DEBUG_LOC_INVALID_ENTRY: | |
409 | error (_("dwarf2_find_location_expression: " | |
410 | "Corrupted DWARF expression.")); | |
fc3ecb3e | 411 | |
f664829e DE |
412 | default: |
413 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
1d6edc3c | 414 | } |
b5758fe4 | 415 | |
bed911e5 | 416 | /* Otherwise, a location expression entry. |
8ddd5a6c | 417 | If the entry is from a DWO, don't add base address: the entry is from |
9fc3eaae | 418 | .debug_addr which already has the DWARF "base address". We still add |
0c7af292 | 419 | text offset in case we're debugging a PIE executable. However, if the |
9fc3eaae | 420 | entry is DW_LLE_offset_pair from a DWO, add the base address as the |
7b9f73fa TT |
421 | operands are offsets relative to the applicable base address. |
422 | If the entry is DW_LLE_start_end or DW_LLE_start_length, then | |
423 | it already is an address, and we don't need to add the base. */ | |
0c7af292 TT |
424 | low += text_offset; |
425 | high += text_offset; | |
426 | if (!baton->from_dwo && kind == DEBUG_LOC_OFFSET_PAIR) | |
bed911e5 DE |
427 | { |
428 | low += base_address; | |
429 | high += base_address; | |
430 | } | |
0d53c4c4 | 431 | |
09ba997f | 432 | if (baton->per_cu->version () < 5) |
43988095 JK |
433 | { |
434 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); | |
435 | loc_ptr += 2; | |
436 | } | |
437 | else | |
438 | { | |
439 | unsigned int bytes_read; | |
440 | ||
441 | length = read_unsigned_leb128 (NULL, loc_ptr, &bytes_read); | |
442 | loc_ptr += bytes_read; | |
443 | } | |
0d53c4c4 | 444 | |
e18b2753 JK |
445 | if (low == high && pc == low) |
446 | { | |
447 | /* This is entry PC record present only at entry point | |
448 | of a function. Verify it is really the function entry point. */ | |
449 | ||
3977b71f | 450 | const struct block *pc_block = block_for_pc (pc); |
e18b2753 JK |
451 | struct symbol *pc_func = NULL; |
452 | ||
453 | if (pc_block) | |
454 | pc_func = block_linkage_function (pc_block); | |
455 | ||
6395b628 | 456 | if (pc_func && pc == pc_func->value_block ()->entry_pc ()) |
e18b2753 JK |
457 | { |
458 | *locexpr_length = length; | |
459 | return loc_ptr; | |
460 | } | |
461 | } | |
462 | ||
0d53c4c4 DJ |
463 | if (pc >= low && pc < high) |
464 | { | |
465 | *locexpr_length = length; | |
466 | return loc_ptr; | |
467 | } | |
468 | ||
469 | loc_ptr += length; | |
470 | } | |
471 | } | |
472 | ||
f1e6e072 TT |
473 | /* Implement find_frame_base_location method for LOC_BLOCK functions using |
474 | DWARF expression for its DW_AT_frame_base. */ | |
475 | ||
476 | static void | |
477 | locexpr_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
478 | const gdb_byte **start, size_t *length) | |
479 | { | |
9a3c8263 SM |
480 | struct dwarf2_locexpr_baton *symbaton |
481 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
482 | |
483 | *length = symbaton->size; | |
484 | *start = symbaton->data; | |
485 | } | |
486 | ||
7d1c9c9b JB |
487 | /* Implement the struct symbol_block_ops::get_frame_base method for |
488 | LOC_BLOCK functions using a DWARF expression as its DW_AT_frame_base. */ | |
63e43d3a PMR |
489 | |
490 | static CORE_ADDR | |
7d1c9c9b | 491 | locexpr_get_frame_base (struct symbol *framefunc, struct frame_info *frame) |
63e43d3a PMR |
492 | { |
493 | struct gdbarch *gdbarch; | |
494 | struct type *type; | |
495 | struct dwarf2_locexpr_baton *dlbaton; | |
496 | const gdb_byte *start; | |
497 | size_t length; | |
498 | struct value *result; | |
499 | ||
500 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
501 | Thus, it's supposed to provide the find_frame_base_location method as | |
502 | well. */ | |
503 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
504 | ||
505 | gdbarch = get_frame_arch (frame); | |
506 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 507 | dlbaton = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); |
63e43d3a PMR |
508 | |
509 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
510 | (framefunc, get_frame_pc (frame), &start, &length); | |
511 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
9f47c707 | 512 | dlbaton->per_cu, dlbaton->per_objfile); |
63e43d3a PMR |
513 | |
514 | /* The DW_AT_frame_base attribute contains a location description which | |
515 | computes the base address itself. However, the call to | |
516 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
517 | that address. The frame base address is thus this variable's | |
518 | address. */ | |
519 | return value_address (result); | |
520 | } | |
521 | ||
f1e6e072 TT |
522 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
523 | function uses DWARF expression for its DW_AT_frame_base. */ | |
524 | ||
525 | const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs = | |
526 | { | |
63e43d3a | 527 | locexpr_find_frame_base_location, |
7d1c9c9b | 528 | locexpr_get_frame_base |
f1e6e072 TT |
529 | }; |
530 | ||
531 | /* Implement find_frame_base_location method for LOC_BLOCK functions using | |
532 | DWARF location list for its DW_AT_frame_base. */ | |
533 | ||
534 | static void | |
535 | loclist_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
536 | const gdb_byte **start, size_t *length) | |
537 | { | |
9a3c8263 SM |
538 | struct dwarf2_loclist_baton *symbaton |
539 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
540 | |
541 | *start = dwarf2_find_location_expression (symbaton, length, pc); | |
542 | } | |
543 | ||
7d1c9c9b JB |
544 | /* Implement the struct symbol_block_ops::get_frame_base method for |
545 | LOC_BLOCK functions using a DWARF location list as its DW_AT_frame_base. */ | |
546 | ||
547 | static CORE_ADDR | |
548 | loclist_get_frame_base (struct symbol *framefunc, struct frame_info *frame) | |
549 | { | |
550 | struct gdbarch *gdbarch; | |
551 | struct type *type; | |
552 | struct dwarf2_loclist_baton *dlbaton; | |
553 | const gdb_byte *start; | |
554 | size_t length; | |
555 | struct value *result; | |
556 | ||
557 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
558 | Thus, it's supposed to provide the find_frame_base_location method as | |
559 | well. */ | |
560 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
561 | ||
562 | gdbarch = get_frame_arch (frame); | |
563 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 564 | dlbaton = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); |
7d1c9c9b JB |
565 | |
566 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
567 | (framefunc, get_frame_pc (frame), &start, &length); | |
568 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
9f47c707 | 569 | dlbaton->per_cu, dlbaton->per_objfile); |
7d1c9c9b JB |
570 | |
571 | /* The DW_AT_frame_base attribute contains a location description which | |
572 | computes the base address itself. However, the call to | |
573 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
574 | that address. The frame base address is thus this variable's | |
575 | address. */ | |
576 | return value_address (result); | |
577 | } | |
578 | ||
f1e6e072 TT |
579 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
580 | function uses DWARF location list for its DW_AT_frame_base. */ | |
581 | ||
582 | const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs = | |
583 | { | |
63e43d3a | 584 | loclist_find_frame_base_location, |
7d1c9c9b | 585 | loclist_get_frame_base |
f1e6e072 TT |
586 | }; |
587 | ||
6c111a4e | 588 | /* See dwarf2/loc.h. */ |
af945b75 TT |
589 | |
590 | void | |
591 | func_get_frame_base_dwarf_block (struct symbol *framefunc, CORE_ADDR pc, | |
592 | const gdb_byte **start, size_t *length) | |
0936ad1d | 593 | { |
f1e6e072 | 594 | if (SYMBOL_BLOCK_OPS (framefunc) != NULL) |
0d53c4c4 | 595 | { |
f1e6e072 | 596 | const struct symbol_block_ops *ops_block = SYMBOL_BLOCK_OPS (framefunc); |
22c6caba | 597 | |
f1e6e072 | 598 | ops_block->find_frame_base_location (framefunc, pc, start, length); |
0d53c4c4 DJ |
599 | } |
600 | else | |
f1e6e072 | 601 | *length = 0; |
0d53c4c4 | 602 | |
1d6edc3c | 603 | if (*length == 0) |
8a3fe4f8 | 604 | error (_("Could not find the frame base for \"%s\"."), |
987012b8 | 605 | framefunc->natural_name ()); |
4c2df51b DJ |
606 | } |
607 | ||
f4091d26 | 608 | /* See loc.h. */ |
386de171 | 609 | |
f4091d26 | 610 | value * |
386de171 TT |
611 | compute_var_value (const char *name) |
612 | { | |
613 | struct block_symbol sym = lookup_symbol (name, nullptr, VAR_DOMAIN, | |
614 | nullptr); | |
615 | if (sym.symbol != nullptr) | |
616 | return value_of_variable (sym.symbol, sym.block); | |
617 | return nullptr; | |
618 | } | |
619 | ||
6c111a4e | 620 | /* See dwarf2/loc.h. */ |
8e3b41a9 | 621 | |
ccce17b0 | 622 | unsigned int entry_values_debug = 0; |
8e3b41a9 JK |
623 | |
624 | /* Helper to set entry_values_debug. */ | |
625 | ||
626 | static void | |
627 | show_entry_values_debug (struct ui_file *file, int from_tty, | |
628 | struct cmd_list_element *c, const char *value) | |
629 | { | |
6cb06a8c TT |
630 | gdb_printf (file, |
631 | _("Entry values and tail call frames debugging is %s.\n"), | |
632 | value); | |
8e3b41a9 JK |
633 | } |
634 | ||
797662d7 | 635 | /* See gdbtypes.h. */ |
8e3b41a9 | 636 | |
a0e0ca70 TT |
637 | void |
638 | call_site_target::iterate_over_addresses | |
639 | (struct gdbarch *call_site_gdbarch, | |
640 | const struct call_site *call_site, | |
641 | struct frame_info *caller_frame, | |
642 | iterate_ftype callback) const | |
8e3b41a9 | 643 | { |
797662d7 | 644 | switch (m_loc_kind) |
8e3b41a9 | 645 | { |
7eb21cc7 | 646 | case call_site_target::DWARF_BLOCK: |
8e3b41a9 JK |
647 | { |
648 | struct dwarf2_locexpr_baton *dwarf_block; | |
649 | struct value *val; | |
650 | struct type *caller_core_addr_type; | |
651 | struct gdbarch *caller_arch; | |
652 | ||
797662d7 | 653 | dwarf_block = m_loc.dwarf_block; |
8e3b41a9 JK |
654 | if (dwarf_block == NULL) |
655 | { | |
7cbd4a93 | 656 | struct bound_minimal_symbol msym; |
8e3b41a9 | 657 | |
b84aaada | 658 | msym = lookup_minimal_symbol_by_pc (call_site->pc () - 1); |
8e3b41a9 | 659 | throw_error (NO_ENTRY_VALUE_ERROR, |
216f72a1 | 660 | _("DW_AT_call_target is not specified at %s in %s"), |
b84aaada | 661 | paddress (call_site_gdbarch, call_site->pc ()), |
7cbd4a93 | 662 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 663 | : msym.minsym->print_name ())); |
8e3b41a9 JK |
664 | |
665 | } | |
666 | if (caller_frame == NULL) | |
667 | { | |
7cbd4a93 | 668 | struct bound_minimal_symbol msym; |
8e3b41a9 | 669 | |
b84aaada | 670 | msym = lookup_minimal_symbol_by_pc (call_site->pc () - 1); |
8e3b41a9 | 671 | throw_error (NO_ENTRY_VALUE_ERROR, |
216f72a1 | 672 | _("DW_AT_call_target DWARF block resolving " |
8e3b41a9 JK |
673 | "requires known frame which is currently not " |
674 | "available at %s in %s"), | |
b84aaada | 675 | paddress (call_site_gdbarch, call_site->pc ()), |
7cbd4a93 | 676 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 677 | : msym.minsym->print_name ())); |
8e3b41a9 JK |
678 | |
679 | } | |
680 | caller_arch = get_frame_arch (caller_frame); | |
681 | caller_core_addr_type = builtin_type (caller_arch)->builtin_func_ptr; | |
682 | val = dwarf2_evaluate_loc_desc (caller_core_addr_type, caller_frame, | |
683 | dwarf_block->data, dwarf_block->size, | |
9f47c707 SM |
684 | dwarf_block->per_cu, |
685 | dwarf_block->per_objfile); | |
216f72a1 | 686 | /* DW_AT_call_target is a DWARF expression, not a DWARF location. */ |
8e3b41a9 | 687 | if (VALUE_LVAL (val) == lval_memory) |
a0e0ca70 | 688 | callback (value_address (val)); |
8e3b41a9 | 689 | else |
a0e0ca70 | 690 | callback (value_as_address (val)); |
8e3b41a9 | 691 | } |
a0e0ca70 | 692 | break; |
8e3b41a9 | 693 | |
7eb21cc7 | 694 | case call_site_target::PHYSNAME: |
8e3b41a9 JK |
695 | { |
696 | const char *physname; | |
3b7344d5 | 697 | struct bound_minimal_symbol msym; |
8e3b41a9 | 698 | |
797662d7 | 699 | physname = m_loc.physname; |
9112db09 JK |
700 | |
701 | /* Handle both the mangled and demangled PHYSNAME. */ | |
702 | msym = lookup_minimal_symbol (physname, NULL, NULL); | |
3b7344d5 | 703 | if (msym.minsym == NULL) |
8e3b41a9 | 704 | { |
b84aaada | 705 | msym = lookup_minimal_symbol_by_pc (call_site->pc () - 1); |
8e3b41a9 JK |
706 | throw_error (NO_ENTRY_VALUE_ERROR, |
707 | _("Cannot find function \"%s\" for a call site target " | |
708 | "at %s in %s"), | |
b84aaada | 709 | physname, paddress (call_site_gdbarch, call_site->pc ()), |
3b7344d5 | 710 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 711 | : msym.minsym->print_name ())); |
8e3b41a9 JK |
712 | |
713 | } | |
4aeddc50 | 714 | callback (msym.value_address ()); |
8e3b41a9 | 715 | } |
a0e0ca70 | 716 | break; |
8e3b41a9 | 717 | |
7eb21cc7 | 718 | case call_site_target::PHYSADDR: |
b0b8879e SM |
719 | { |
720 | dwarf2_per_objfile *per_objfile = call_site->per_objfile; | |
721 | compunit_symtab *cust = per_objfile->get_symtab (call_site->per_cu); | |
c1e35bc9 | 722 | int sect_idx = cust->block_line_section (); |
b0b8879e SM |
723 | CORE_ADDR delta = per_objfile->objfile->section_offsets[sect_idx]; |
724 | ||
a0e0ca70 | 725 | callback (m_loc.physaddr + delta); |
b0b8879e | 726 | } |
a0e0ca70 | 727 | break; |
8e3b41a9 | 728 | |
48ac197b TT |
729 | case call_site_target::ADDRESSES: |
730 | { | |
731 | dwarf2_per_objfile *per_objfile = call_site->per_objfile; | |
732 | compunit_symtab *cust = per_objfile->get_symtab (call_site->per_cu); | |
733 | int sect_idx = cust->block_line_section (); | |
734 | CORE_ADDR delta = per_objfile->objfile->section_offsets[sect_idx]; | |
735 | ||
736 | for (unsigned i = 0; i < m_loc.addresses.length; ++i) | |
737 | callback (m_loc.addresses.values[i] + delta); | |
738 | } | |
739 | break; | |
740 | ||
8e3b41a9 JK |
741 | default: |
742 | internal_error (__FILE__, __LINE__, _("invalid call site target kind")); | |
743 | } | |
744 | } | |
745 | ||
111c6489 JK |
746 | /* Convert function entry point exact address ADDR to the function which is |
747 | compliant with TAIL_CALL_LIST_COMPLETE condition. Throw | |
748 | NO_ENTRY_VALUE_ERROR otherwise. */ | |
749 | ||
750 | static struct symbol * | |
751 | func_addr_to_tail_call_list (struct gdbarch *gdbarch, CORE_ADDR addr) | |
752 | { | |
753 | struct symbol *sym = find_pc_function (addr); | |
754 | struct type *type; | |
755 | ||
6395b628 | 756 | if (sym == NULL || sym->value_block ()->entry_pc () != addr) |
111c6489 | 757 | throw_error (NO_ENTRY_VALUE_ERROR, |
216f72a1 | 758 | _("DW_TAG_call_site resolving failed to find function " |
111c6489 JK |
759 | "name for address %s"), |
760 | paddress (gdbarch, addr)); | |
761 | ||
5f9c5a63 | 762 | type = sym->type (); |
78134374 | 763 | gdb_assert (type->code () == TYPE_CODE_FUNC); |
111c6489 JK |
764 | gdb_assert (TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_FUNC); |
765 | ||
766 | return sym; | |
767 | } | |
768 | ||
2d6c5dc2 JK |
769 | /* Verify function with entry point exact address ADDR can never call itself |
770 | via its tail calls (incl. transitively). Throw NO_ENTRY_VALUE_ERROR if it | |
771 | can call itself via tail calls. | |
772 | ||
773 | If a funtion can tail call itself its entry value based parameters are | |
774 | unreliable. There is no verification whether the value of some/all | |
775 | parameters is unchanged through the self tail call, we expect if there is | |
776 | a self tail call all the parameters can be modified. */ | |
777 | ||
778 | static void | |
779 | func_verify_no_selftailcall (struct gdbarch *gdbarch, CORE_ADDR verify_addr) | |
780 | { | |
2d6c5dc2 JK |
781 | CORE_ADDR addr; |
782 | ||
2d6c5dc2 JK |
783 | /* The verification is completely unordered. Track here function addresses |
784 | which still need to be iterated. */ | |
fc4007c9 | 785 | std::vector<CORE_ADDR> todo; |
2d6c5dc2 | 786 | |
fc4007c9 TT |
787 | /* Track here CORE_ADDRs which were already visited. */ |
788 | std::unordered_set<CORE_ADDR> addr_hash; | |
2d6c5dc2 | 789 | |
fc4007c9 TT |
790 | todo.push_back (verify_addr); |
791 | while (!todo.empty ()) | |
2d6c5dc2 JK |
792 | { |
793 | struct symbol *func_sym; | |
794 | struct call_site *call_site; | |
795 | ||
fc4007c9 TT |
796 | addr = todo.back (); |
797 | todo.pop_back (); | |
2d6c5dc2 JK |
798 | |
799 | func_sym = func_addr_to_tail_call_list (gdbarch, addr); | |
800 | ||
5f9c5a63 | 801 | for (call_site = TYPE_TAIL_CALL_LIST (func_sym->type ()); |
2d6c5dc2 JK |
802 | call_site; call_site = call_site->tail_call_next) |
803 | { | |
2d6c5dc2 JK |
804 | /* CALLER_FRAME with registers is not available for tail-call jumped |
805 | frames. */ | |
a0e0ca70 TT |
806 | call_site->iterate_over_addresses (gdbarch, nullptr, |
807 | [&] (CORE_ADDR target_addr) | |
2d6c5dc2 | 808 | { |
a0e0ca70 TT |
809 | if (target_addr == verify_addr) |
810 | { | |
811 | struct bound_minimal_symbol msym; | |
812 | ||
813 | msym = lookup_minimal_symbol_by_pc (verify_addr); | |
814 | throw_error (NO_ENTRY_VALUE_ERROR, | |
815 | _("DW_OP_entry_value resolving has found " | |
816 | "function \"%s\" at %s can call itself via tail " | |
817 | "calls"), | |
818 | (msym.minsym == NULL ? "???" | |
819 | : msym.minsym->print_name ()), | |
820 | paddress (gdbarch, verify_addr)); | |
821 | } | |
822 | ||
823 | if (addr_hash.insert (target_addr).second) | |
824 | todo.push_back (target_addr); | |
825 | }); | |
2d6c5dc2 JK |
826 | } |
827 | } | |
2d6c5dc2 JK |
828 | } |
829 | ||
111c6489 JK |
830 | /* Print user readable form of CALL_SITE->PC to gdb_stdlog. Used only for |
831 | ENTRY_VALUES_DEBUG. */ | |
832 | ||
833 | static void | |
834 | tailcall_dump (struct gdbarch *gdbarch, const struct call_site *call_site) | |
835 | { | |
b84aaada | 836 | CORE_ADDR addr = call_site->pc (); |
7cbd4a93 | 837 | struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (addr - 1); |
111c6489 | 838 | |
6cb06a8c TT |
839 | gdb_printf (gdb_stdlog, " %s(%s)", paddress (gdbarch, addr), |
840 | (msym.minsym == NULL ? "???" | |
841 | : msym.minsym->print_name ())); | |
111c6489 JK |
842 | |
843 | } | |
844 | ||
111c6489 JK |
845 | /* Intersect RESULTP with CHAIN to keep RESULTP unambiguous, keep in RESULTP |
846 | only top callers and bottom callees which are present in both. GDBARCH is | |
847 | used only for ENTRY_VALUES_DEBUG. RESULTP is NULL after return if there are | |
848 | no remaining possibilities to provide unambiguous non-trivial result. | |
849 | RESULTP should point to NULL on the first (initialization) call. Caller is | |
850 | responsible for xfree of any RESULTP data. */ | |
851 | ||
852 | static void | |
fc4007c9 TT |
853 | chain_candidate (struct gdbarch *gdbarch, |
854 | gdb::unique_xmalloc_ptr<struct call_site_chain> *resultp, | |
394d8c59 | 855 | const std::vector<struct call_site *> &chain) |
111c6489 | 856 | { |
394d8c59 | 857 | long length = chain.size (); |
111c6489 JK |
858 | int callers, callees, idx; |
859 | ||
fc4007c9 | 860 | if (*resultp == NULL) |
111c6489 JK |
861 | { |
862 | /* Create the initial chain containing all the passed PCs. */ | |
863 | ||
fc4007c9 TT |
864 | struct call_site_chain *result |
865 | = ((struct call_site_chain *) | |
866 | xmalloc (sizeof (*result) | |
867 | + sizeof (*result->call_site) * (length - 1))); | |
111c6489 JK |
868 | result->length = length; |
869 | result->callers = result->callees = length; | |
394d8c59 TT |
870 | if (!chain.empty ()) |
871 | memcpy (result->call_site, chain.data (), | |
19a1b230 | 872 | sizeof (*result->call_site) * length); |
fc4007c9 | 873 | resultp->reset (result); |
111c6489 JK |
874 | |
875 | if (entry_values_debug) | |
876 | { | |
6cb06a8c | 877 | gdb_printf (gdb_stdlog, "tailcall: initial:"); |
111c6489 JK |
878 | for (idx = 0; idx < length; idx++) |
879 | tailcall_dump (gdbarch, result->call_site[idx]); | |
a11ac3b3 | 880 | gdb_putc ('\n', gdb_stdlog); |
111c6489 JK |
881 | } |
882 | ||
883 | return; | |
884 | } | |
885 | ||
886 | if (entry_values_debug) | |
887 | { | |
6cb06a8c | 888 | gdb_printf (gdb_stdlog, "tailcall: compare:"); |
111c6489 | 889 | for (idx = 0; idx < length; idx++) |
394d8c59 | 890 | tailcall_dump (gdbarch, chain[idx]); |
a11ac3b3 | 891 | gdb_putc ('\n', gdb_stdlog); |
111c6489 JK |
892 | } |
893 | ||
894 | /* Intersect callers. */ | |
895 | ||
fc4007c9 | 896 | callers = std::min ((long) (*resultp)->callers, length); |
111c6489 | 897 | for (idx = 0; idx < callers; idx++) |
394d8c59 | 898 | if ((*resultp)->call_site[idx] != chain[idx]) |
111c6489 | 899 | { |
fc4007c9 | 900 | (*resultp)->callers = idx; |
111c6489 JK |
901 | break; |
902 | } | |
903 | ||
904 | /* Intersect callees. */ | |
905 | ||
fc4007c9 | 906 | callees = std::min ((long) (*resultp)->callees, length); |
111c6489 | 907 | for (idx = 0; idx < callees; idx++) |
fc4007c9 | 908 | if ((*resultp)->call_site[(*resultp)->length - 1 - idx] |
394d8c59 | 909 | != chain[length - 1 - idx]) |
111c6489 | 910 | { |
fc4007c9 | 911 | (*resultp)->callees = idx; |
111c6489 JK |
912 | break; |
913 | } | |
914 | ||
915 | if (entry_values_debug) | |
916 | { | |
6cb06a8c | 917 | gdb_printf (gdb_stdlog, "tailcall: reduced:"); |
fc4007c9 TT |
918 | for (idx = 0; idx < (*resultp)->callers; idx++) |
919 | tailcall_dump (gdbarch, (*resultp)->call_site[idx]); | |
0426ad51 | 920 | gdb_puts (" |", gdb_stdlog); |
fc4007c9 TT |
921 | for (idx = 0; idx < (*resultp)->callees; idx++) |
922 | tailcall_dump (gdbarch, | |
923 | (*resultp)->call_site[(*resultp)->length | |
924 | - (*resultp)->callees + idx]); | |
a11ac3b3 | 925 | gdb_putc ('\n', gdb_stdlog); |
111c6489 JK |
926 | } |
927 | ||
fc4007c9 | 928 | if ((*resultp)->callers == 0 && (*resultp)->callees == 0) |
111c6489 JK |
929 | { |
930 | /* There are no common callers or callees. It could be also a direct | |
931 | call (which has length 0) with ambiguous possibility of an indirect | |
932 | call - CALLERS == CALLEES == 0 is valid during the first allocation | |
933 | but any subsequence processing of such entry means ambiguity. */ | |
fc4007c9 | 934 | resultp->reset (NULL); |
111c6489 JK |
935 | return; |
936 | } | |
937 | ||
938 | /* See call_site_find_chain_1 why there is no way to reach the bottom callee | |
939 | PC again. In such case there must be two different code paths to reach | |
e0619de6 | 940 | it. CALLERS + CALLEES equal to LENGTH in the case of self tail-call. */ |
fc4007c9 | 941 | gdb_assert ((*resultp)->callers + (*resultp)->callees <= (*resultp)->length); |
111c6489 JK |
942 | } |
943 | ||
206bedc2 TT |
944 | /* Recursively try to construct the call chain. GDBARCH, RESULTP, and |
945 | CHAIN are passed to chain_candidate. ADDR_HASH tracks which | |
946 | addresses have already been seen along the current chain. | |
947 | CALL_SITE is the call site to visit, and CALLEE_PC is the PC we're | |
948 | trying to "reach". Returns false if an error has already been | |
949 | detected and so an early return can be done. If it makes sense to | |
950 | keep trying (even if no answer has yet been found), returns | |
951 | true. */ | |
952 | ||
953 | static bool | |
954 | call_site_find_chain_2 | |
955 | (struct gdbarch *gdbarch, | |
956 | gdb::unique_xmalloc_ptr<struct call_site_chain> *resultp, | |
957 | std::vector<struct call_site *> &chain, | |
958 | std::unordered_set<CORE_ADDR> &addr_hash, | |
959 | struct call_site *call_site, | |
960 | CORE_ADDR callee_pc) | |
961 | { | |
a0e0ca70 TT |
962 | std::vector<CORE_ADDR> addresses; |
963 | bool found_exact = false; | |
964 | call_site->iterate_over_addresses (gdbarch, nullptr, | |
965 | [&] (CORE_ADDR addr) | |
966 | { | |
967 | if (addr == callee_pc) | |
968 | found_exact = true; | |
969 | else | |
970 | addresses.push_back (addr); | |
971 | }); | |
206bedc2 | 972 | |
a0e0ca70 | 973 | if (found_exact) |
206bedc2 TT |
974 | { |
975 | chain_candidate (gdbarch, resultp, chain); | |
976 | /* If RESULTP was reset, then chain_candidate failed, and so we | |
977 | can tell our callers to early-return. */ | |
978 | return *resultp != nullptr; | |
979 | } | |
980 | ||
a0e0ca70 | 981 | for (CORE_ADDR target_func_addr : addresses) |
206bedc2 | 982 | { |
a0e0ca70 TT |
983 | struct symbol *target_func |
984 | = func_addr_to_tail_call_list (gdbarch, target_func_addr); | |
985 | for (struct call_site *target_call_site | |
986 | = TYPE_TAIL_CALL_LIST (target_func->type ()); | |
987 | target_call_site != nullptr; | |
988 | target_call_site = target_call_site->tail_call_next) | |
206bedc2 | 989 | { |
a0e0ca70 TT |
990 | if (addr_hash.insert (target_call_site->pc ()).second) |
991 | { | |
992 | /* Successfully entered TARGET_CALL_SITE. */ | |
993 | chain.push_back (target_call_site); | |
206bedc2 | 994 | |
a0e0ca70 TT |
995 | if (!call_site_find_chain_2 (gdbarch, resultp, chain, |
996 | addr_hash, target_call_site, | |
997 | callee_pc)) | |
998 | return false; | |
206bedc2 | 999 | |
a0e0ca70 TT |
1000 | size_t removed = addr_hash.erase (target_call_site->pc ()); |
1001 | gdb_assert (removed == 1); | |
1002 | chain.pop_back (); | |
1003 | } | |
206bedc2 TT |
1004 | } |
1005 | } | |
1006 | ||
1007 | return true; | |
1008 | } | |
1009 | ||
1010 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All | |
1011 | the assumed frames between them use GDBARCH. Any unreliability | |
1012 | results in thrown NO_ENTRY_VALUE_ERROR. */ | |
111c6489 | 1013 | |
8084e579 | 1014 | static gdb::unique_xmalloc_ptr<call_site_chain> |
111c6489 JK |
1015 | call_site_find_chain_1 (struct gdbarch *gdbarch, CORE_ADDR caller_pc, |
1016 | CORE_ADDR callee_pc) | |
1017 | { | |
c4be5165 | 1018 | CORE_ADDR save_callee_pc = callee_pc; |
fc4007c9 | 1019 | gdb::unique_xmalloc_ptr<struct call_site_chain> retval; |
111c6489 JK |
1020 | struct call_site *call_site; |
1021 | ||
111c6489 JK |
1022 | /* CHAIN contains only the intermediate CALL_SITEs. Neither CALLER_PC's |
1023 | call_site nor any possible call_site at CALLEE_PC's function is there. | |
1024 | Any CALL_SITE in CHAIN will be iterated to its siblings - via | |
1025 | TAIL_CALL_NEXT. This is inappropriate for CALLER_PC's call_site. */ | |
fc4007c9 | 1026 | std::vector<struct call_site *> chain; |
111c6489 | 1027 | |
a0e0ca70 TT |
1028 | /* A given call site may have multiple associated addresses. This |
1029 | can happen if, e.g., the caller is split by hot/cold | |
1030 | partitioning. This vector tracks the ones we haven't visited | |
1031 | yet. */ | |
1032 | std::vector<std::vector<CORE_ADDR>> unvisited_addresses; | |
1033 | ||
111c6489 JK |
1034 | /* We are not interested in the specific PC inside the callee function. */ |
1035 | callee_pc = get_pc_function_start (callee_pc); | |
1036 | if (callee_pc == 0) | |
1037 | throw_error (NO_ENTRY_VALUE_ERROR, _("Unable to find function for PC %s"), | |
c4be5165 | 1038 | paddress (gdbarch, save_callee_pc)); |
111c6489 | 1039 | |
fc4007c9 TT |
1040 | /* Mark CALL_SITEs so we do not visit the same ones twice. */ |
1041 | std::unordered_set<CORE_ADDR> addr_hash; | |
111c6489 JK |
1042 | |
1043 | /* Do not push CALL_SITE to CHAIN. Push there only the first tail call site | |
1044 | at the target's function. All the possible tail call sites in the | |
1045 | target's function will get iterated as already pushed into CHAIN via their | |
1046 | TAIL_CALL_NEXT. */ | |
1047 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
206bedc2 TT |
1048 | /* No need to check the return value here, because we no longer care |
1049 | about possible early returns. */ | |
1050 | call_site_find_chain_2 (gdbarch, &retval, chain, addr_hash, call_site, | |
1051 | callee_pc); | |
111c6489 JK |
1052 | |
1053 | if (retval == NULL) | |
1054 | { | |
7cbd4a93 | 1055 | struct bound_minimal_symbol msym_caller, msym_callee; |
111c6489 JK |
1056 | |
1057 | msym_caller = lookup_minimal_symbol_by_pc (caller_pc); | |
1058 | msym_callee = lookup_minimal_symbol_by_pc (callee_pc); | |
1059 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1060 | _("There are no unambiguously determinable intermediate " | |
1061 | "callers or callees between caller function \"%s\" at %s " | |
1062 | "and callee function \"%s\" at %s"), | |
7cbd4a93 | 1063 | (msym_caller.minsym == NULL |
c9d95fa3 | 1064 | ? "???" : msym_caller.minsym->print_name ()), |
111c6489 | 1065 | paddress (gdbarch, caller_pc), |
7cbd4a93 | 1066 | (msym_callee.minsym == NULL |
c9d95fa3 | 1067 | ? "???" : msym_callee.minsym->print_name ()), |
111c6489 JK |
1068 | paddress (gdbarch, callee_pc)); |
1069 | } | |
1070 | ||
8084e579 | 1071 | return retval; |
111c6489 JK |
1072 | } |
1073 | ||
1074 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1075 | assumed frames between them use GDBARCH. If valid call_site_chain cannot be | |
8084e579 | 1076 | constructed return NULL. */ |
111c6489 | 1077 | |
8084e579 | 1078 | gdb::unique_xmalloc_ptr<call_site_chain> |
111c6489 JK |
1079 | call_site_find_chain (struct gdbarch *gdbarch, CORE_ADDR caller_pc, |
1080 | CORE_ADDR callee_pc) | |
1081 | { | |
8084e579 | 1082 | gdb::unique_xmalloc_ptr<call_site_chain> retval; |
111c6489 | 1083 | |
a70b8144 | 1084 | try |
111c6489 JK |
1085 | { |
1086 | retval = call_site_find_chain_1 (gdbarch, caller_pc, callee_pc); | |
1087 | } | |
230d2906 | 1088 | catch (const gdb_exception_error &e) |
111c6489 JK |
1089 | { |
1090 | if (e.error == NO_ENTRY_VALUE_ERROR) | |
1091 | { | |
1092 | if (entry_values_debug) | |
1093 | exception_print (gdb_stdout, e); | |
1094 | ||
1095 | return NULL; | |
1096 | } | |
1097 | else | |
eedc3f4f | 1098 | throw; |
111c6489 | 1099 | } |
492d29ea | 1100 | |
111c6489 JK |
1101 | return retval; |
1102 | } | |
1103 | ||
24c5c679 JK |
1104 | /* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */ |
1105 | ||
1106 | static int | |
1107 | call_site_parameter_matches (struct call_site_parameter *parameter, | |
1108 | enum call_site_parameter_kind kind, | |
1109 | union call_site_parameter_u kind_u) | |
1110 | { | |
1111 | if (kind == parameter->kind) | |
1112 | switch (kind) | |
1113 | { | |
1114 | case CALL_SITE_PARAMETER_DWARF_REG: | |
1115 | return kind_u.dwarf_reg == parameter->u.dwarf_reg; | |
fc3ecb3e | 1116 | |
24c5c679 JK |
1117 | case CALL_SITE_PARAMETER_FB_OFFSET: |
1118 | return kind_u.fb_offset == parameter->u.fb_offset; | |
fc3ecb3e | 1119 | |
1788b2d3 | 1120 | case CALL_SITE_PARAMETER_PARAM_OFFSET: |
9c541725 | 1121 | return kind_u.param_cu_off == parameter->u.param_cu_off; |
24c5c679 JK |
1122 | } |
1123 | return 0; | |
1124 | } | |
1125 | ||
0a2b69d0 | 1126 | /* See loc.h. */ |
8e3b41a9 | 1127 | |
0a2b69d0 | 1128 | struct call_site_parameter * |
24c5c679 JK |
1129 | dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, |
1130 | enum call_site_parameter_kind kind, | |
1131 | union call_site_parameter_u kind_u, | |
9f47c707 SM |
1132 | dwarf2_per_cu_data **per_cu_return, |
1133 | dwarf2_per_objfile **per_objfile_return) | |
8e3b41a9 | 1134 | { |
9e3a7d65 JK |
1135 | CORE_ADDR func_addr, caller_pc; |
1136 | struct gdbarch *gdbarch; | |
1137 | struct frame_info *caller_frame; | |
8e3b41a9 JK |
1138 | struct call_site *call_site; |
1139 | int iparams; | |
509f0fd9 JK |
1140 | /* Initialize it just to avoid a GCC false warning. */ |
1141 | struct call_site_parameter *parameter = NULL; | |
8e3b41a9 JK |
1142 | CORE_ADDR target_addr; |
1143 | ||
9e3a7d65 JK |
1144 | while (get_frame_type (frame) == INLINE_FRAME) |
1145 | { | |
1146 | frame = get_prev_frame (frame); | |
1147 | gdb_assert (frame != NULL); | |
1148 | } | |
1149 | ||
1150 | func_addr = get_frame_func (frame); | |
1151 | gdbarch = get_frame_arch (frame); | |
1152 | caller_frame = get_prev_frame (frame); | |
8e3b41a9 JK |
1153 | if (gdbarch != frame_unwind_arch (frame)) |
1154 | { | |
7cbd4a93 TT |
1155 | struct bound_minimal_symbol msym |
1156 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1157 | struct gdbarch *caller_gdbarch = frame_unwind_arch (frame); |
1158 | ||
1159 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1160 | _("DW_OP_entry_value resolving callee gdbarch %s " |
8e3b41a9 JK |
1161 | "(of %s (%s)) does not match caller gdbarch %s"), |
1162 | gdbarch_bfd_arch_info (gdbarch)->printable_name, | |
1163 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1164 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 1165 | : msym.minsym->print_name ()), |
8e3b41a9 JK |
1166 | gdbarch_bfd_arch_info (caller_gdbarch)->printable_name); |
1167 | } | |
1168 | ||
1169 | if (caller_frame == NULL) | |
1170 | { | |
7cbd4a93 TT |
1171 | struct bound_minimal_symbol msym |
1172 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 | 1173 | |
216f72a1 | 1174 | throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_entry_value resolving " |
8e3b41a9 JK |
1175 | "requires caller of %s (%s)"), |
1176 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1177 | (msym.minsym == NULL ? "???" |
c9d95fa3 | 1178 | : msym.minsym->print_name ())); |
8e3b41a9 JK |
1179 | } |
1180 | caller_pc = get_frame_pc (caller_frame); | |
1181 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1182 | ||
a0e0ca70 TT |
1183 | bool found = false; |
1184 | unsigned count = 0; | |
1185 | call_site->iterate_over_addresses (gdbarch, caller_frame, | |
1186 | [&] (CORE_ADDR addr) | |
1187 | { | |
1188 | /* Preserve any address. */ | |
1189 | target_addr = addr; | |
1190 | ++count; | |
1191 | if (addr == func_addr) | |
1192 | found = true; | |
1193 | }); | |
1194 | if (!found) | |
8e3b41a9 JK |
1195 | { |
1196 | struct minimal_symbol *target_msym, *func_msym; | |
1197 | ||
7cbd4a93 TT |
1198 | target_msym = lookup_minimal_symbol_by_pc (target_addr).minsym; |
1199 | func_msym = lookup_minimal_symbol_by_pc (func_addr).minsym; | |
8e3b41a9 | 1200 | throw_error (NO_ENTRY_VALUE_ERROR, |
a0e0ca70 | 1201 | _("DW_OP_entry_value resolving expects callee %s at %s %s" |
8e3b41a9 JK |
1202 | "but the called frame is for %s at %s"), |
1203 | (target_msym == NULL ? "???" | |
c9d95fa3 | 1204 | : target_msym->print_name ()), |
8e3b41a9 | 1205 | paddress (gdbarch, target_addr), |
a0e0ca70 TT |
1206 | (count > 0 |
1207 | ? _("(but note there are multiple addresses not listed)") | |
1208 | : ""), | |
c9d95fa3 | 1209 | func_msym == NULL ? "???" : func_msym->print_name (), |
8e3b41a9 JK |
1210 | paddress (gdbarch, func_addr)); |
1211 | } | |
1212 | ||
2d6c5dc2 JK |
1213 | /* No entry value based parameters would be reliable if this function can |
1214 | call itself via tail calls. */ | |
1215 | func_verify_no_selftailcall (gdbarch, func_addr); | |
1216 | ||
8e3b41a9 JK |
1217 | for (iparams = 0; iparams < call_site->parameter_count; iparams++) |
1218 | { | |
1219 | parameter = &call_site->parameter[iparams]; | |
24c5c679 | 1220 | if (call_site_parameter_matches (parameter, kind, kind_u)) |
8e3b41a9 JK |
1221 | break; |
1222 | } | |
1223 | if (iparams == call_site->parameter_count) | |
1224 | { | |
7cbd4a93 TT |
1225 | struct minimal_symbol *msym |
1226 | = lookup_minimal_symbol_by_pc (caller_pc).minsym; | |
8e3b41a9 | 1227 | |
216f72a1 | 1228 | /* DW_TAG_call_site_parameter will be missing just if GCC could not |
8e3b41a9 JK |
1229 | determine its value. */ |
1230 | throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot find matching parameter " | |
216f72a1 | 1231 | "at DW_TAG_call_site %s at %s"), |
8e3b41a9 | 1232 | paddress (gdbarch, caller_pc), |
c9d95fa3 | 1233 | msym == NULL ? "???" : msym->print_name ()); |
8e3b41a9 JK |
1234 | } |
1235 | ||
1236 | *per_cu_return = call_site->per_cu; | |
9f47c707 | 1237 | *per_objfile_return = call_site->per_objfile; |
8e3b41a9 JK |
1238 | return parameter; |
1239 | } | |
1240 | ||
a471c594 | 1241 | /* Return value for PARAMETER matching DEREF_SIZE. If DEREF_SIZE is -1, return |
216f72a1 JK |
1242 | the normal DW_AT_call_value block. Otherwise return the |
1243 | DW_AT_call_data_value (dereferenced) block. | |
e18b2753 JK |
1244 | |
1245 | TYPE and CALLER_FRAME specify how to evaluate the DWARF block into returned | |
1246 | struct value. | |
1247 | ||
1248 | Function always returns non-NULL, non-optimized out value. It throws | |
1249 | NO_ENTRY_VALUE_ERROR if it cannot resolve the value for any reason. */ | |
1250 | ||
1251 | static struct value * | |
1252 | dwarf_entry_parameter_to_value (struct call_site_parameter *parameter, | |
a471c594 | 1253 | CORE_ADDR deref_size, struct type *type, |
e18b2753 | 1254 | struct frame_info *caller_frame, |
9f47c707 SM |
1255 | dwarf2_per_cu_data *per_cu, |
1256 | dwarf2_per_objfile *per_objfile) | |
e18b2753 | 1257 | { |
a471c594 | 1258 | const gdb_byte *data_src; |
a471c594 JK |
1259 | size_t size; |
1260 | ||
1261 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
1262 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1263 | ||
1264 | /* DEREF_SIZE size is not verified here. */ | |
1265 | if (data_src == NULL) | |
1266 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1267 | _("Cannot resolve DW_AT_call_data_value")); |
e18b2753 | 1268 | |
70454ee7 ZZ |
1269 | return dwarf2_evaluate_loc_desc (type, caller_frame, data_src, size, per_cu, |
1270 | per_objfile, false); | |
e18b2753 JK |
1271 | } |
1272 | ||
a471c594 JK |
1273 | /* VALUE must be of type lval_computed with entry_data_value_funcs. Perform |
1274 | the indirect method on it, that is use its stored target value, the sole | |
1275 | purpose of entry_data_value_funcs.. */ | |
1276 | ||
1277 | static struct value * | |
1278 | entry_data_value_coerce_ref (const struct value *value) | |
1279 | { | |
1280 | struct type *checked_type = check_typedef (value_type (value)); | |
1281 | struct value *target_val; | |
1282 | ||
aa006118 | 1283 | if (!TYPE_IS_REFERENCE (checked_type)) |
a471c594 JK |
1284 | return NULL; |
1285 | ||
9a3c8263 | 1286 | target_val = (struct value *) value_computed_closure (value); |
a471c594 JK |
1287 | value_incref (target_val); |
1288 | return target_val; | |
1289 | } | |
1290 | ||
1291 | /* Implement copy_closure. */ | |
1292 | ||
1293 | static void * | |
1294 | entry_data_value_copy_closure (const struct value *v) | |
1295 | { | |
9a3c8263 | 1296 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1297 | |
1298 | value_incref (target_val); | |
1299 | return target_val; | |
1300 | } | |
1301 | ||
1302 | /* Implement free_closure. */ | |
1303 | ||
1304 | static void | |
1305 | entry_data_value_free_closure (struct value *v) | |
1306 | { | |
9a3c8263 | 1307 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 | 1308 | |
22bc8444 | 1309 | value_decref (target_val); |
a471c594 JK |
1310 | } |
1311 | ||
1312 | /* Vector for methods for an entry value reference where the referenced value | |
1313 | is stored in the caller. On the first dereference use | |
216f72a1 | 1314 | DW_AT_call_data_value in the caller. */ |
a471c594 JK |
1315 | |
1316 | static const struct lval_funcs entry_data_value_funcs = | |
1317 | { | |
1318 | NULL, /* read */ | |
1319 | NULL, /* write */ | |
a519e8ff | 1320 | nullptr, |
a471c594 JK |
1321 | NULL, /* indirect */ |
1322 | entry_data_value_coerce_ref, | |
1323 | NULL, /* check_synthetic_pointer */ | |
1324 | entry_data_value_copy_closure, | |
1325 | entry_data_value_free_closure | |
1326 | }; | |
1327 | ||
24c5c679 JK |
1328 | /* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U |
1329 | are used to match DW_AT_location at the caller's | |
216f72a1 | 1330 | DW_TAG_call_site_parameter. |
e18b2753 JK |
1331 | |
1332 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1333 | cannot resolve the parameter for any reason. */ | |
1334 | ||
1335 | static struct value * | |
1336 | value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame, | |
24c5c679 JK |
1337 | enum call_site_parameter_kind kind, |
1338 | union call_site_parameter_u kind_u) | |
e18b2753 | 1339 | { |
a471c594 | 1340 | struct type *checked_type = check_typedef (type); |
27710edb | 1341 | struct type *target_type = checked_type->target_type (); |
e18b2753 | 1342 | struct frame_info *caller_frame = get_prev_frame (frame); |
a471c594 | 1343 | struct value *outer_val, *target_val, *val; |
e18b2753 | 1344 | struct call_site_parameter *parameter; |
9f47c707 SM |
1345 | dwarf2_per_cu_data *caller_per_cu; |
1346 | dwarf2_per_objfile *caller_per_objfile; | |
e18b2753 | 1347 | |
24c5c679 | 1348 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
9f47c707 SM |
1349 | &caller_per_cu, |
1350 | &caller_per_objfile); | |
e18b2753 | 1351 | |
a471c594 JK |
1352 | outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */, |
1353 | type, caller_frame, | |
9f47c707 SM |
1354 | caller_per_cu, |
1355 | caller_per_objfile); | |
a471c594 | 1356 | |
216f72a1 | 1357 | /* Check if DW_AT_call_data_value cannot be used. If it should be |
a471c594 JK |
1358 | used and it is not available do not fall back to OUTER_VAL - dereferencing |
1359 | TYPE_CODE_REF with non-entry data value would give current value - not the | |
1360 | entry value. */ | |
1361 | ||
aa006118 | 1362 | if (!TYPE_IS_REFERENCE (checked_type) |
27710edb | 1363 | || checked_type->target_type () == NULL) |
a471c594 JK |
1364 | return outer_val; |
1365 | ||
1366 | target_val = dwarf_entry_parameter_to_value (parameter, | |
df86565b | 1367 | target_type->length (), |
a471c594 | 1368 | target_type, caller_frame, |
9f47c707 SM |
1369 | caller_per_cu, |
1370 | caller_per_objfile); | |
a471c594 | 1371 | |
a471c594 | 1372 | val = allocate_computed_value (type, &entry_data_value_funcs, |
895dafa6 | 1373 | release_value (target_val).release ()); |
a471c594 JK |
1374 | |
1375 | /* Copy the referencing pointer to the new computed value. */ | |
50888e42 SM |
1376 | memcpy (value_contents_raw (val).data (), |
1377 | value_contents_raw (outer_val).data (), | |
df86565b | 1378 | checked_type->length ()); |
a471c594 JK |
1379 | set_value_lazy (val, 0); |
1380 | ||
1381 | return val; | |
e18b2753 JK |
1382 | } |
1383 | ||
1384 | /* Read parameter of TYPE at (callee) FRAME's function entry. DATA and | |
1385 | SIZE are DWARF block used to match DW_AT_location at the caller's | |
216f72a1 | 1386 | DW_TAG_call_site_parameter. |
e18b2753 JK |
1387 | |
1388 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1389 | cannot resolve the parameter for any reason. */ | |
1390 | ||
1391 | static struct value * | |
1392 | value_of_dwarf_block_entry (struct type *type, struct frame_info *frame, | |
1393 | const gdb_byte *block, size_t block_len) | |
1394 | { | |
24c5c679 | 1395 | union call_site_parameter_u kind_u; |
e18b2753 | 1396 | |
24c5c679 JK |
1397 | kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len); |
1398 | if (kind_u.dwarf_reg != -1) | |
1399 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG, | |
1400 | kind_u); | |
e18b2753 | 1401 | |
24c5c679 JK |
1402 | if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset)) |
1403 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET, | |
dda83cd7 | 1404 | kind_u); |
e18b2753 JK |
1405 | |
1406 | /* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message | |
1407 | suppressed during normal operation. The expression can be arbitrary if | |
1408 | there is no caller-callee entry value binding expected. */ | |
1409 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1410 | _("DWARF-2 expression error: DW_OP_entry_value is supported " |
e18b2753 JK |
1411 | "only for single DW_OP_reg* or for DW_OP_fbreg(*)")); |
1412 | } | |
1413 | ||
3326303b MG |
1414 | /* Fetch a DW_AT_const_value through a synthetic pointer. */ |
1415 | ||
1416 | static struct value * | |
1417 | fetch_const_value_from_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
14095eb3 SM |
1418 | dwarf2_per_cu_data *per_cu, |
1419 | dwarf2_per_objfile *per_objfile, | |
3326303b MG |
1420 | struct type *type) |
1421 | { | |
1422 | struct value *result = NULL; | |
3326303b MG |
1423 | const gdb_byte *bytes; |
1424 | LONGEST len; | |
1425 | ||
8268c778 | 1426 | auto_obstack temp_obstack; |
14095eb3 SM |
1427 | bytes = dwarf2_fetch_constant_bytes (die, per_cu, per_objfile, |
1428 | &temp_obstack, &len); | |
3326303b MG |
1429 | |
1430 | if (bytes != NULL) | |
1431 | { | |
1432 | if (byte_offset >= 0 | |
df86565b | 1433 | && byte_offset + type->target_type ()->length () <= len) |
3326303b MG |
1434 | { |
1435 | bytes += byte_offset; | |
27710edb | 1436 | result = value_from_contents (type->target_type (), bytes); |
3326303b MG |
1437 | } |
1438 | else | |
1439 | invalid_synthetic_pointer (); | |
1440 | } | |
1441 | else | |
27710edb | 1442 | result = allocate_optimized_out_value (type->target_type ()); |
3326303b | 1443 | |
3326303b MG |
1444 | return result; |
1445 | } | |
1446 | ||
f4091d26 | 1447 | /* See loc.h. */ |
3326303b | 1448 | |
f4091d26 | 1449 | struct value * |
3326303b | 1450 | indirect_synthetic_pointer (sect_offset die, LONGEST byte_offset, |
14095eb3 SM |
1451 | dwarf2_per_cu_data *per_cu, |
1452 | dwarf2_per_objfile *per_objfile, | |
e4a62c65 TV |
1453 | struct frame_info *frame, struct type *type, |
1454 | bool resolve_abstract_p) | |
3326303b MG |
1455 | { |
1456 | /* Fetch the location expression of the DIE we're pointing to. */ | |
041d9819 SM |
1457 | auto get_frame_address_in_block_wrapper = [frame] () |
1458 | { | |
1459 | return get_frame_address_in_block (frame); | |
1460 | }; | |
3326303b | 1461 | struct dwarf2_locexpr_baton baton |
14095eb3 | 1462 | = dwarf2_fetch_die_loc_sect_off (die, per_cu, per_objfile, |
041d9819 | 1463 | get_frame_address_in_block_wrapper, |
e4a62c65 | 1464 | resolve_abstract_p); |
3326303b | 1465 | |
7942e96e | 1466 | /* Get type of pointed-to DIE. */ |
14095eb3 SM |
1467 | struct type *orig_type = dwarf2_fetch_die_type_sect_off (die, per_cu, |
1468 | per_objfile); | |
7942e96e AA |
1469 | if (orig_type == NULL) |
1470 | invalid_synthetic_pointer (); | |
1471 | ||
3326303b MG |
1472 | /* If pointed-to DIE has a DW_AT_location, evaluate it and return the |
1473 | resulting value. Otherwise, it may have a DW_AT_const_value instead, | |
1474 | or it may've been optimized out. */ | |
1475 | if (baton.data != NULL) | |
7942e96e AA |
1476 | return dwarf2_evaluate_loc_desc_full (orig_type, frame, baton.data, |
1477 | baton.size, baton.per_cu, | |
9f47c707 | 1478 | baton.per_objfile, |
27710edb | 1479 | type->target_type (), |
3326303b MG |
1480 | byte_offset); |
1481 | else | |
1482 | return fetch_const_value_from_synthetic_pointer (die, byte_offset, per_cu, | |
14095eb3 | 1483 | per_objfile, type); |
3326303b MG |
1484 | } |
1485 | ||
4c2df51b | 1486 | /* Evaluate a location description, starting at DATA and with length |
8cf6f0b1 | 1487 | SIZE, to find the current location of variable of TYPE in the |
7942e96e AA |
1488 | context of FRAME. If SUBOBJ_TYPE is non-NULL, return instead the |
1489 | location of the subobject of type SUBOBJ_TYPE at byte offset | |
1490 | SUBOBJ_BYTE_OFFSET within the variable of type TYPE. */ | |
a2d33775 | 1491 | |
8cf6f0b1 TT |
1492 | static struct value * |
1493 | dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame, | |
56eb65bd | 1494 | const gdb_byte *data, size_t size, |
9f47c707 SM |
1495 | dwarf2_per_cu_data *per_cu, |
1496 | dwarf2_per_objfile *per_objfile, | |
7942e96e | 1497 | struct type *subobj_type, |
70454ee7 ZZ |
1498 | LONGEST subobj_byte_offset, |
1499 | bool as_lval) | |
4c2df51b | 1500 | { |
7942e96e AA |
1501 | if (subobj_type == NULL) |
1502 | { | |
1503 | subobj_type = type; | |
1504 | subobj_byte_offset = 0; | |
1505 | } | |
1506 | else if (subobj_byte_offset < 0) | |
8cf6f0b1 TT |
1507 | invalid_synthetic_pointer (); |
1508 | ||
0d53c4c4 | 1509 | if (size == 0) |
7942e96e | 1510 | return allocate_optimized_out_value (subobj_type); |
0d53c4c4 | 1511 | |
0579205a | 1512 | dwarf_expr_context ctx (per_objfile, per_cu->addr_size ()); |
4c2df51b | 1513 | |
0579205a | 1514 | value *retval; |
0cf08227 | 1515 | scoped_value_mark free_values; |
4a227398 | 1516 | |
a70b8144 | 1517 | try |
79e1a869 | 1518 | { |
70454ee7 ZZ |
1519 | retval = ctx.evaluate (data, size, as_lval, per_cu, frame, nullptr, |
1520 | type, subobj_type, subobj_byte_offset); | |
79e1a869 | 1521 | } |
230d2906 | 1522 | catch (const gdb_exception_error &ex) |
79e1a869 PA |
1523 | { |
1524 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1525 | { | |
0cf08227 | 1526 | free_values.free_to_mark (); |
7942e96e AA |
1527 | retval = allocate_value (subobj_type); |
1528 | mark_value_bytes_unavailable (retval, 0, | |
df86565b | 1529 | subobj_type->length ()); |
79e1a869 PA |
1530 | return retval; |
1531 | } | |
8e3b41a9 JK |
1532 | else if (ex.error == NO_ENTRY_VALUE_ERROR) |
1533 | { | |
1534 | if (entry_values_debug) | |
1535 | exception_print (gdb_stdout, ex); | |
0cf08227 | 1536 | free_values.free_to_mark (); |
7942e96e | 1537 | return allocate_optimized_out_value (subobj_type); |
8e3b41a9 | 1538 | } |
79e1a869 | 1539 | else |
eedc3f4f | 1540 | throw; |
79e1a869 PA |
1541 | } |
1542 | ||
ba5bc3e5 ZZ |
1543 | /* We need to clean up all the values that are not needed any more. |
1544 | The problem with a value_ref_ptr class is that it disconnects the | |
1545 | RETVAL from the value garbage collection, so we need to make | |
1546 | a copy of that value on the stack to keep everything consistent. | |
1547 | The value_ref_ptr will clean up after itself at the end of this block. */ | |
1548 | value_ref_ptr value_holder = value_ref_ptr::new_reference (retval); | |
1549 | free_values.free_to_mark (); | |
42be36b3 | 1550 | |
ba5bc3e5 | 1551 | return value_copy (retval); |
4c2df51b | 1552 | } |
8cf6f0b1 TT |
1553 | |
1554 | /* The exported interface to dwarf2_evaluate_loc_desc_full; it always | |
1555 | passes 0 as the byte_offset. */ | |
1556 | ||
1557 | struct value * | |
1558 | dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame, | |
56eb65bd | 1559 | const gdb_byte *data, size_t size, |
9f47c707 | 1560 | dwarf2_per_cu_data *per_cu, |
70454ee7 | 1561 | dwarf2_per_objfile *per_objfile, bool as_lval) |
8cf6f0b1 | 1562 | { |
7942e96e | 1563 | return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, |
70454ee7 | 1564 | per_objfile, NULL, 0, as_lval); |
8cf6f0b1 TT |
1565 | } |
1566 | ||
b249d2c2 TT |
1567 | /* Evaluates a dwarf expression and stores the result in VAL, |
1568 | expecting that the dwarf expression only produces a single | |
1569 | CORE_ADDR. FRAME is the frame in which the expression is | |
1570 | evaluated. ADDR_STACK is a context (location of a variable) and | |
1571 | might be needed to evaluate the location expression. | |
22480d7c | 1572 | |
1fb43cf7 AB |
1573 | PUSH_VALUES is an array of values to be pushed to the expression stack |
1574 | before evaluation starts. PUSH_VALUES[0] is pushed first, then | |
1575 | PUSH_VALUES[1], and so on. | |
22480d7c AB |
1576 | |
1577 | Returns 1 on success, 0 otherwise. */ | |
80180f79 SA |
1578 | |
1579 | static int | |
1580 | dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton, | |
63e43d3a | 1581 | struct frame_info *frame, |
b249d2c2 | 1582 | const struct property_addr_info *addr_stack, |
61122aa9 | 1583 | CORE_ADDR *valp, |
1fb43cf7 | 1584 | gdb::array_view<CORE_ADDR> push_values, |
7ce05d21 | 1585 | bool *is_reference) |
80180f79 | 1586 | { |
80180f79 SA |
1587 | if (dlbaton == NULL || dlbaton->size == 0) |
1588 | return 0; | |
1589 | ||
89b07335 | 1590 | dwarf2_per_objfile *per_objfile = dlbaton->per_objfile; |
0579205a ZZ |
1591 | dwarf2_per_cu_data *per_cu = dlbaton->per_cu; |
1592 | dwarf_expr_context ctx (per_objfile, per_cu->addr_size ()); | |
80180f79 | 1593 | |
0579205a | 1594 | value *result; |
ba5bc3e5 ZZ |
1595 | scoped_value_mark free_values; |
1596 | ||
1fb43cf7 AB |
1597 | /* Place any initial values onto the expression stack. */ |
1598 | for (const auto &val : push_values) | |
1599 | ctx.push_address (val, false); | |
80180f79 | 1600 | |
a70b8144 | 1601 | try |
16f808ec | 1602 | { |
0579205a | 1603 | result = ctx.evaluate (dlbaton->data, dlbaton->size, |
70454ee7 | 1604 | true, per_cu, frame, addr_stack); |
16f808ec | 1605 | } |
230d2906 | 1606 | catch (const gdb_exception_error &ex) |
16f808ec TV |
1607 | { |
1608 | if (ex.error == NOT_AVAILABLE_ERROR) | |
1609 | { | |
1610 | return 0; | |
1611 | } | |
1612 | else if (ex.error == NO_ENTRY_VALUE_ERROR) | |
1613 | { | |
1614 | if (entry_values_debug) | |
1615 | exception_print (gdb_stdout, ex); | |
1616 | return 0; | |
1617 | } | |
1618 | else | |
eedc3f4f | 1619 | throw; |
16f808ec | 1620 | } |
80180f79 | 1621 | |
ba5bc3e5 ZZ |
1622 | if (value_optimized_out (result)) |
1623 | return 0; | |
1624 | ||
1625 | if (VALUE_LVAL (result) == lval_memory) | |
1626 | *valp = value_address (result); | |
1627 | else | |
80180f79 | 1628 | { |
ba5bc3e5 ZZ |
1629 | if (VALUE_LVAL (result) == not_lval) |
1630 | *is_reference = false; | |
1631 | ||
1632 | *valp = value_as_address (result); | |
80180f79 SA |
1633 | } |
1634 | ||
ba5bc3e5 | 1635 | return 1; |
80180f79 SA |
1636 | } |
1637 | ||
6c111a4e | 1638 | /* See dwarf2/loc.h. */ |
80180f79 | 1639 | |
603490bf | 1640 | bool |
08412b07 | 1641 | dwarf2_evaluate_property (const struct dynamic_prop *prop, |
63e43d3a | 1642 | struct frame_info *frame, |
fe26d3a3 | 1643 | const struct property_addr_info *addr_stack, |
61122aa9 | 1644 | CORE_ADDR *value, |
1fb43cf7 | 1645 | gdb::array_view<CORE_ADDR> push_values) |
80180f79 SA |
1646 | { |
1647 | if (prop == NULL) | |
603490bf | 1648 | return false; |
80180f79 | 1649 | |
63e43d3a PMR |
1650 | if (frame == NULL && has_stack_frames ()) |
1651 | frame = get_selected_frame (NULL); | |
1652 | ||
8c2e4e06 | 1653 | switch (prop->kind ()) |
80180f79 SA |
1654 | { |
1655 | case PROP_LOCEXPR: | |
1656 | { | |
9a3c8263 | 1657 | const struct dwarf2_property_baton *baton |
8c2e4e06 | 1658 | = (const struct dwarf2_property_baton *) prop->baton (); |
9a49df9d | 1659 | gdb_assert (baton->property_type != NULL); |
80180f79 | 1660 | |
7ce05d21 | 1661 | bool is_reference = baton->locexpr.is_reference; |
b249d2c2 | 1662 | if (dwarf2_locexpr_baton_eval (&baton->locexpr, frame, addr_stack, |
1fb43cf7 | 1663 | value, push_values, &is_reference)) |
80180f79 | 1664 | { |
7ce05d21 | 1665 | if (is_reference) |
80180f79 | 1666 | { |
9a49df9d | 1667 | struct value *val = value_at (baton->property_type, *value); |
80180f79 SA |
1668 | *value = value_as_address (val); |
1669 | } | |
0d4e84ed AB |
1670 | else |
1671 | { | |
1672 | gdb_assert (baton->property_type != NULL); | |
1673 | ||
1674 | struct type *type = check_typedef (baton->property_type); | |
df86565b | 1675 | if (type->length () < sizeof (CORE_ADDR) |
c6d940a9 | 1676 | && !type->is_unsigned ()) |
0d4e84ed AB |
1677 | { |
1678 | /* If we have a valid return candidate and it's value | |
1679 | is signed, we have to sign-extend the value because | |
1680 | CORE_ADDR on 64bit machine has 8 bytes but address | |
1681 | size of an 32bit application is bytes. */ | |
1682 | const int addr_size | |
09ba997f | 1683 | = (baton->locexpr.per_cu->addr_size () |
0d4e84ed AB |
1684 | * TARGET_CHAR_BIT); |
1685 | const CORE_ADDR neg_mask | |
1686 | = (~((CORE_ADDR) 0) << (addr_size - 1)); | |
1687 | ||
1688 | /* Check if signed bit is set and sign-extend values. */ | |
1689 | if (*value & neg_mask) | |
1690 | *value |= neg_mask; | |
1691 | } | |
1692 | } | |
603490bf | 1693 | return true; |
80180f79 SA |
1694 | } |
1695 | } | |
1696 | break; | |
1697 | ||
1698 | case PROP_LOCLIST: | |
1699 | { | |
9a3c8263 | 1700 | struct dwarf2_property_baton *baton |
8c2e4e06 | 1701 | = (struct dwarf2_property_baton *) prop->baton (); |
1c33af77 | 1702 | CORE_ADDR pc; |
80180f79 SA |
1703 | const gdb_byte *data; |
1704 | struct value *val; | |
1705 | size_t size; | |
1706 | ||
1c33af77 TV |
1707 | if (frame == NULL |
1708 | || !get_frame_address_in_block_if_available (frame, &pc)) | |
1709 | return false; | |
1710 | ||
80180f79 SA |
1711 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); |
1712 | if (data != NULL) | |
1713 | { | |
9a49df9d | 1714 | val = dwarf2_evaluate_loc_desc (baton->property_type, frame, data, |
9f47c707 SM |
1715 | size, baton->loclist.per_cu, |
1716 | baton->loclist.per_objfile); | |
80180f79 SA |
1717 | if (!value_optimized_out (val)) |
1718 | { | |
1719 | *value = value_as_address (val); | |
603490bf | 1720 | return true; |
80180f79 SA |
1721 | } |
1722 | } | |
1723 | } | |
1724 | break; | |
1725 | ||
1726 | case PROP_CONST: | |
8c2e4e06 | 1727 | *value = prop->const_val (); |
603490bf | 1728 | return true; |
df25ebbd JB |
1729 | |
1730 | case PROP_ADDR_OFFSET: | |
1731 | { | |
9a3c8263 | 1732 | struct dwarf2_property_baton *baton |
8c2e4e06 | 1733 | = (struct dwarf2_property_baton *) prop->baton (); |
fe26d3a3 | 1734 | const struct property_addr_info *pinfo; |
df25ebbd JB |
1735 | struct value *val; |
1736 | ||
1737 | for (pinfo = addr_stack; pinfo != NULL; pinfo = pinfo->next) | |
988915ee TT |
1738 | { |
1739 | /* This approach lets us avoid checking the qualifiers. */ | |
1740 | if (TYPE_MAIN_TYPE (pinfo->type) | |
9a49df9d | 1741 | == TYPE_MAIN_TYPE (baton->property_type)) |
988915ee TT |
1742 | break; |
1743 | } | |
df25ebbd | 1744 | if (pinfo == NULL) |
2c811c0f | 1745 | error (_("cannot find reference address for offset property")); |
b249d2c2 | 1746 | if (pinfo->valaddr.data () != NULL) |
c3345124 JB |
1747 | val = value_from_contents |
1748 | (baton->offset_info.type, | |
b249d2c2 | 1749 | pinfo->valaddr.data () + baton->offset_info.offset); |
c3345124 JB |
1750 | else |
1751 | val = value_at (baton->offset_info.type, | |
1752 | pinfo->addr + baton->offset_info.offset); | |
df25ebbd | 1753 | *value = value_as_address (val); |
603490bf | 1754 | return true; |
df25ebbd | 1755 | } |
386de171 TT |
1756 | |
1757 | case PROP_VARIABLE_NAME: | |
1758 | { | |
1759 | struct value *val = compute_var_value (prop->variable_name ()); | |
1760 | if (val != nullptr) | |
1761 | { | |
1762 | *value = value_as_long (val); | |
1763 | return true; | |
1764 | } | |
1765 | } | |
1766 | break; | |
80180f79 SA |
1767 | } |
1768 | ||
603490bf | 1769 | return false; |
80180f79 SA |
1770 | } |
1771 | ||
6c111a4e | 1772 | /* See dwarf2/loc.h. */ |
bb2ec1b3 TT |
1773 | |
1774 | void | |
d82b3862 | 1775 | dwarf2_compile_property_to_c (string_file *stream, |
bb2ec1b3 TT |
1776 | const char *result_name, |
1777 | struct gdbarch *gdbarch, | |
3637a558 | 1778 | std::vector<bool> ®isters_used, |
bb2ec1b3 TT |
1779 | const struct dynamic_prop *prop, |
1780 | CORE_ADDR pc, | |
1781 | struct symbol *sym) | |
1782 | { | |
9a3c8263 | 1783 | struct dwarf2_property_baton *baton |
8c2e4e06 | 1784 | = (struct dwarf2_property_baton *) prop->baton (); |
bb2ec1b3 TT |
1785 | const gdb_byte *data; |
1786 | size_t size; | |
4b167ea1 SM |
1787 | dwarf2_per_cu_data *per_cu; |
1788 | dwarf2_per_objfile *per_objfile; | |
bb2ec1b3 | 1789 | |
8c2e4e06 | 1790 | if (prop->kind () == PROP_LOCEXPR) |
bb2ec1b3 TT |
1791 | { |
1792 | data = baton->locexpr.data; | |
1793 | size = baton->locexpr.size; | |
1794 | per_cu = baton->locexpr.per_cu; | |
4b167ea1 | 1795 | per_objfile = baton->locexpr.per_objfile; |
bb2ec1b3 TT |
1796 | } |
1797 | else | |
1798 | { | |
8c2e4e06 | 1799 | gdb_assert (prop->kind () == PROP_LOCLIST); |
bb2ec1b3 TT |
1800 | |
1801 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
1802 | per_cu = baton->loclist.per_cu; | |
4b167ea1 | 1803 | per_objfile = baton->loclist.per_objfile; |
bb2ec1b3 TT |
1804 | } |
1805 | ||
1806 | compile_dwarf_bounds_to_c (stream, result_name, prop, sym, pc, | |
1807 | gdbarch, registers_used, | |
09ba997f | 1808 | per_cu->addr_size (), |
4b167ea1 | 1809 | data, data + size, per_cu, per_objfile); |
bb2ec1b3 TT |
1810 | } |
1811 | ||
183657ed ZZ |
1812 | /* Compute the correct symbol_needs_kind value for the location |
1813 | expression in EXPR. | |
1814 | ||
1815 | Implemented by traversing the logical control flow graph of the | |
1816 | expression. */ | |
4c2df51b | 1817 | |
183657ed ZZ |
1818 | static enum symbol_needs_kind |
1819 | dwarf2_get_symbol_read_needs (gdb::array_view<const gdb_byte> expr, | |
1820 | dwarf2_per_cu_data *per_cu, | |
1821 | dwarf2_per_objfile *per_objfile, | |
1822 | bfd_endian byte_order, | |
1823 | int addr_size, | |
1824 | int ref_addr_size, | |
1825 | int depth = 0) | |
4c2df51b | 1826 | { |
183657ed | 1827 | enum symbol_needs_kind symbol_needs = SYMBOL_NEEDS_NONE; |
192ca6d8 | 1828 | |
183657ed ZZ |
1829 | /* If the expression is empty, we have nothing to do. */ |
1830 | if (expr.empty ()) | |
1831 | return symbol_needs; | |
4c2df51b | 1832 | |
183657ed | 1833 | const gdb_byte *expr_end = expr.data () + expr.size (); |
192ca6d8 | 1834 | |
183657ed ZZ |
1835 | /* List of operations to visit. Operations in this list are not visited yet, |
1836 | so are not in VISITED_OPS (and vice-versa). */ | |
1837 | std::vector<const gdb_byte *> ops_to_visit; | |
192ca6d8 | 1838 | |
183657ed ZZ |
1839 | /* Operations already visited. */ |
1840 | std::unordered_set<const gdb_byte *> visited_ops; | |
192ca6d8 | 1841 | |
183657ed ZZ |
1842 | /* Insert OP in OPS_TO_VISIT if it is within the expression's range and |
1843 | hasn't been visited yet. */ | |
1844 | auto insert_in_ops_to_visit | |
1845 | = [expr_end, &visited_ops, &ops_to_visit] (const gdb_byte *op_ptr) | |
1846 | { | |
1847 | if (op_ptr >= expr_end) | |
1848 | return; | |
192ca6d8 | 1849 | |
183657ed ZZ |
1850 | if (visited_ops.find (op_ptr) != visited_ops.end ()) |
1851 | return; | |
192ca6d8 | 1852 | |
183657ed ZZ |
1853 | ops_to_visit.push_back (op_ptr); |
1854 | }; | |
192ca6d8 | 1855 | |
183657ed ZZ |
1856 | /* Expressions can invoke other expressions with DW_OP_call*. Protect against |
1857 | a loop of calls. */ | |
1858 | const int max_depth = 256; | |
192ca6d8 | 1859 | |
183657ed ZZ |
1860 | if (depth > max_depth) |
1861 | error (_("DWARF-2 expression error: Loop detected.")); | |
192ca6d8 | 1862 | |
183657ed | 1863 | depth++; |
7d5697f9 | 1864 | |
183657ed ZZ |
1865 | /* Initialize the to-visit list with the first operation. */ |
1866 | insert_in_ops_to_visit (&expr[0]); | |
192ca6d8 | 1867 | |
183657ed ZZ |
1868 | while (!ops_to_visit.empty ()) |
1869 | { | |
1870 | /* Pop one op to visit, mark it as visited. */ | |
1871 | const gdb_byte *op_ptr = ops_to_visit.back (); | |
1872 | ops_to_visit.pop_back (); | |
1873 | gdb_assert (visited_ops.find (op_ptr) == visited_ops.end ()); | |
1874 | visited_ops.insert (op_ptr); | |
192ca6d8 | 1875 | |
183657ed | 1876 | dwarf_location_atom op = (dwarf_location_atom) *op_ptr; |
192ca6d8 | 1877 | |
183657ed ZZ |
1878 | /* Most operations have a single possible following operation |
1879 | (they are not conditional branches). The code below updates | |
1880 | OP_PTR to point to that following operation, which is pushed | |
1881 | back to OPS_TO_VISIT, if needed, at the bottom. Here, leave | |
1882 | OP_PTR pointing just after the operand. */ | |
1883 | op_ptr++; | |
a6b786da | 1884 | |
183657ed ZZ |
1885 | /* The DWARF expression might have a bug causing an infinite |
1886 | loop. In that case, quitting is the only way out. */ | |
1887 | QUIT; | |
a6b786da | 1888 | |
183657ed ZZ |
1889 | switch (op) |
1890 | { | |
1891 | case DW_OP_lit0: | |
1892 | case DW_OP_lit1: | |
1893 | case DW_OP_lit2: | |
1894 | case DW_OP_lit3: | |
1895 | case DW_OP_lit4: | |
1896 | case DW_OP_lit5: | |
1897 | case DW_OP_lit6: | |
1898 | case DW_OP_lit7: | |
1899 | case DW_OP_lit8: | |
1900 | case DW_OP_lit9: | |
1901 | case DW_OP_lit10: | |
1902 | case DW_OP_lit11: | |
1903 | case DW_OP_lit12: | |
1904 | case DW_OP_lit13: | |
1905 | case DW_OP_lit14: | |
1906 | case DW_OP_lit15: | |
1907 | case DW_OP_lit16: | |
1908 | case DW_OP_lit17: | |
1909 | case DW_OP_lit18: | |
1910 | case DW_OP_lit19: | |
1911 | case DW_OP_lit20: | |
1912 | case DW_OP_lit21: | |
1913 | case DW_OP_lit22: | |
1914 | case DW_OP_lit23: | |
1915 | case DW_OP_lit24: | |
1916 | case DW_OP_lit25: | |
1917 | case DW_OP_lit26: | |
1918 | case DW_OP_lit27: | |
1919 | case DW_OP_lit28: | |
1920 | case DW_OP_lit29: | |
1921 | case DW_OP_lit30: | |
1922 | case DW_OP_lit31: | |
1923 | case DW_OP_stack_value: | |
1924 | case DW_OP_dup: | |
1925 | case DW_OP_drop: | |
1926 | case DW_OP_swap: | |
1927 | case DW_OP_over: | |
1928 | case DW_OP_rot: | |
1929 | case DW_OP_deref: | |
1930 | case DW_OP_abs: | |
1931 | case DW_OP_neg: | |
1932 | case DW_OP_not: | |
1933 | case DW_OP_and: | |
1934 | case DW_OP_div: | |
1935 | case DW_OP_minus: | |
1936 | case DW_OP_mod: | |
1937 | case DW_OP_mul: | |
1938 | case DW_OP_or: | |
1939 | case DW_OP_plus: | |
1940 | case DW_OP_shl: | |
1941 | case DW_OP_shr: | |
1942 | case DW_OP_shra: | |
1943 | case DW_OP_xor: | |
1944 | case DW_OP_le: | |
1945 | case DW_OP_ge: | |
1946 | case DW_OP_eq: | |
1947 | case DW_OP_lt: | |
1948 | case DW_OP_gt: | |
1949 | case DW_OP_ne: | |
1950 | case DW_OP_GNU_push_tls_address: | |
1951 | case DW_OP_nop: | |
1952 | case DW_OP_GNU_uninit: | |
1953 | case DW_OP_push_object_address: | |
1954 | break; | |
192ca6d8 | 1955 | |
183657ed ZZ |
1956 | case DW_OP_form_tls_address: |
1957 | if (symbol_needs <= SYMBOL_NEEDS_REGISTERS) | |
1958 | symbol_needs = SYMBOL_NEEDS_REGISTERS; | |
1959 | break; | |
3019eac3 | 1960 | |
183657ed ZZ |
1961 | case DW_OP_convert: |
1962 | case DW_OP_GNU_convert: | |
1963 | case DW_OP_reinterpret: | |
1964 | case DW_OP_GNU_reinterpret: | |
1965 | case DW_OP_addrx: | |
1966 | case DW_OP_GNU_addr_index: | |
1967 | case DW_OP_GNU_const_index: | |
1968 | case DW_OP_constu: | |
1969 | case DW_OP_plus_uconst: | |
1970 | case DW_OP_piece: | |
1971 | op_ptr = safe_skip_leb128 (op_ptr, expr_end); | |
1972 | break; | |
3019eac3 | 1973 | |
183657ed ZZ |
1974 | case DW_OP_consts: |
1975 | op_ptr = safe_skip_leb128 (op_ptr, expr_end); | |
1976 | break; | |
08412b07 | 1977 | |
183657ed ZZ |
1978 | case DW_OP_bit_piece: |
1979 | op_ptr = safe_skip_leb128 (op_ptr, expr_end); | |
1980 | op_ptr = safe_skip_leb128 (op_ptr, expr_end); | |
1981 | break; | |
7635cf79 | 1982 | |
183657ed ZZ |
1983 | case DW_OP_deref_type: |
1984 | case DW_OP_GNU_deref_type: | |
1985 | op_ptr++; | |
1986 | op_ptr = safe_skip_leb128 (op_ptr, expr_end); | |
1987 | break; | |
7635cf79 | 1988 | |
183657ed ZZ |
1989 | case DW_OP_addr: |
1990 | op_ptr += addr_size; | |
1991 | break; | |
9e8b7a03 | 1992 | |
183657ed ZZ |
1993 | case DW_OP_const1u: |
1994 | case DW_OP_const1s: | |
1995 | op_ptr += 1; | |
1996 | break; | |
4c2df51b | 1997 | |
183657ed ZZ |
1998 | case DW_OP_const2u: |
1999 | case DW_OP_const2s: | |
2000 | op_ptr += 2; | |
2001 | break; | |
eb115069 | 2002 | |
183657ed ZZ |
2003 | case DW_OP_const4s: |
2004 | case DW_OP_const4u: | |
2005 | op_ptr += 4; | |
2006 | break; | |
192ca6d8 | 2007 | |
183657ed ZZ |
2008 | case DW_OP_const8s: |
2009 | case DW_OP_const8u: | |
2010 | op_ptr += 8; | |
2011 | break; | |
2012 | ||
2013 | case DW_OP_reg0: | |
2014 | case DW_OP_reg1: | |
2015 | case DW_OP_reg2: | |
2016 | case DW_OP_reg3: | |
2017 | case DW_OP_reg4: | |
2018 | case DW_OP_reg5: | |
2019 | case DW_OP_reg6: | |
2020 | case DW_OP_reg7: | |
2021 | case DW_OP_reg8: | |
2022 | case DW_OP_reg9: | |
2023 | case DW_OP_reg10: | |
2024 | case DW_OP_reg11: | |
2025 | case DW_OP_reg12: | |
2026 | case DW_OP_reg13: | |
2027 | case DW_OP_reg14: | |
2028 | case DW_OP_reg15: | |
2029 | case DW_OP_reg16: | |
2030 | case DW_OP_reg17: | |
2031 | case DW_OP_reg18: | |
2032 | case DW_OP_reg19: | |
2033 | case DW_OP_reg20: | |
2034 | case DW_OP_reg21: | |
2035 | case DW_OP_reg22: | |
2036 | case DW_OP_reg23: | |
2037 | case DW_OP_reg24: | |
2038 | case DW_OP_reg25: | |
2039 | case DW_OP_reg26: | |
2040 | case DW_OP_reg27: | |
2041 | case DW_OP_reg28: | |
2042 | case DW_OP_reg29: | |
2043 | case DW_OP_reg30: | |
2044 | case DW_OP_reg31: | |
2045 | case DW_OP_regx: | |
2046 | case DW_OP_breg0: | |
2047 | case DW_OP_breg1: | |
2048 | case DW_OP_breg2: | |
2049 | case DW_OP_breg3: | |
2050 | case DW_OP_breg4: | |
2051 | case DW_OP_breg5: | |
2052 | case DW_OP_breg6: | |
2053 | case DW_OP_breg7: | |
2054 | case DW_OP_breg8: | |
2055 | case DW_OP_breg9: | |
2056 | case DW_OP_breg10: | |
2057 | case DW_OP_breg11: | |
2058 | case DW_OP_breg12: | |
2059 | case DW_OP_breg13: | |
2060 | case DW_OP_breg14: | |
2061 | case DW_OP_breg15: | |
2062 | case DW_OP_breg16: | |
2063 | case DW_OP_breg17: | |
2064 | case DW_OP_breg18: | |
2065 | case DW_OP_breg19: | |
2066 | case DW_OP_breg20: | |
2067 | case DW_OP_breg21: | |
2068 | case DW_OP_breg22: | |
2069 | case DW_OP_breg23: | |
2070 | case DW_OP_breg24: | |
2071 | case DW_OP_breg25: | |
2072 | case DW_OP_breg26: | |
2073 | case DW_OP_breg27: | |
2074 | case DW_OP_breg28: | |
2075 | case DW_OP_breg29: | |
2076 | case DW_OP_breg30: | |
2077 | case DW_OP_breg31: | |
2078 | case DW_OP_bregx: | |
2079 | case DW_OP_fbreg: | |
2080 | case DW_OP_call_frame_cfa: | |
2081 | case DW_OP_entry_value: | |
2082 | case DW_OP_GNU_entry_value: | |
2083 | case DW_OP_GNU_parameter_ref: | |
2084 | case DW_OP_regval_type: | |
2085 | case DW_OP_GNU_regval_type: | |
2086 | symbol_needs = SYMBOL_NEEDS_FRAME; | |
2087 | break; | |
4c2df51b | 2088 | |
183657ed ZZ |
2089 | case DW_OP_implicit_value: |
2090 | { | |
2091 | uint64_t uoffset; | |
2092 | op_ptr = safe_read_uleb128 (op_ptr, expr_end, &uoffset); | |
2093 | op_ptr += uoffset; | |
2094 | break; | |
2095 | } | |
4c2df51b | 2096 | |
183657ed ZZ |
2097 | case DW_OP_implicit_pointer: |
2098 | case DW_OP_GNU_implicit_pointer: | |
2099 | op_ptr += ref_addr_size; | |
2100 | op_ptr = safe_skip_leb128 (op_ptr, expr_end); | |
2101 | break; | |
f630a401 | 2102 | |
183657ed ZZ |
2103 | case DW_OP_deref_size: |
2104 | case DW_OP_pick: | |
2105 | op_ptr++; | |
2106 | break; | |
87808bd6 | 2107 | |
183657ed ZZ |
2108 | case DW_OP_skip: |
2109 | { | |
2110 | int64_t offset = extract_signed_integer (op_ptr, 2, byte_order); | |
2111 | op_ptr += 2; | |
2112 | op_ptr += offset; | |
2113 | break; | |
2114 | } | |
2115 | ||
2116 | case DW_OP_bra: | |
2117 | { | |
2118 | /* This is the only operation that pushes two operations in | |
2119 | the to-visit list, so handle it all here. */ | |
2120 | LONGEST offset = extract_signed_integer (op_ptr, 2, byte_order); | |
2121 | op_ptr += 2; | |
2122 | ||
2123 | insert_in_ops_to_visit (op_ptr + offset); | |
2124 | insert_in_ops_to_visit (op_ptr); | |
2125 | continue; | |
2126 | } | |
f54be24b | 2127 | |
183657ed ZZ |
2128 | case DW_OP_call2: |
2129 | case DW_OP_call4: | |
2130 | { | |
2131 | unsigned int len = op == DW_OP_call2 ? 2 : 4; | |
2132 | cu_offset cu_off | |
2133 | = (cu_offset) extract_unsigned_integer (op_ptr, len, byte_order); | |
2134 | op_ptr += len; | |
2135 | ||
2136 | auto get_frame_pc = [&symbol_needs] () | |
2137 | { | |
2138 | symbol_needs = SYMBOL_NEEDS_FRAME; | |
2139 | return 0; | |
2140 | }; | |
2141 | ||
2142 | struct dwarf2_locexpr_baton baton | |
2143 | = dwarf2_fetch_die_loc_cu_off (cu_off, per_cu, | |
2144 | per_objfile, | |
2145 | get_frame_pc); | |
2146 | ||
2147 | /* If SYMBOL_NEEDS_FRAME is returned from the previous call, | |
2148 | we dont have to check the baton content. */ | |
2149 | if (symbol_needs != SYMBOL_NEEDS_FRAME) | |
2150 | { | |
2151 | gdbarch *arch = baton.per_objfile->objfile->arch (); | |
2152 | gdb::array_view<const gdb_byte> sub_expr (baton.data, | |
2153 | baton.size); | |
2154 | symbol_needs | |
2155 | = dwarf2_get_symbol_read_needs (sub_expr, | |
2156 | baton.per_cu, | |
2157 | baton.per_objfile, | |
2158 | gdbarch_byte_order (arch), | |
2159 | baton.per_cu->addr_size (), | |
2160 | baton.per_cu->ref_addr_size (), | |
2161 | depth); | |
2162 | } | |
2163 | break; | |
2164 | } | |
2165 | ||
2166 | case DW_OP_GNU_variable_value: | |
2167 | { | |
2168 | sect_offset sect_off | |
2169 | = (sect_offset) extract_unsigned_integer (op_ptr, | |
2170 | ref_addr_size, | |
2171 | byte_order); | |
2172 | op_ptr += ref_addr_size; | |
2173 | ||
2174 | struct type *die_type | |
2175 | = dwarf2_fetch_die_type_sect_off (sect_off, per_cu, | |
2176 | per_objfile); | |
2177 | ||
2178 | if (die_type == NULL) | |
2179 | error (_("Bad DW_OP_GNU_variable_value DIE.")); | |
2180 | ||
2181 | /* Note: Things still work when the following test is | |
2182 | removed. This test and error is here to conform to the | |
2183 | proposed specification. */ | |
2184 | if (die_type->code () != TYPE_CODE_INT | |
2185 | && die_type->code () != TYPE_CODE_PTR) | |
2186 | error (_("Type of DW_OP_GNU_variable_value DIE must be " | |
2187 | "an integer or pointer.")); | |
2188 | ||
2189 | auto get_frame_pc = [&symbol_needs] () | |
2190 | { | |
2191 | symbol_needs = SYMBOL_NEEDS_FRAME; | |
2192 | return 0; | |
2193 | }; | |
2194 | ||
2195 | struct dwarf2_locexpr_baton baton | |
2196 | = dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, | |
2197 | per_objfile, | |
2198 | get_frame_pc, true); | |
2199 | ||
2200 | /* If SYMBOL_NEEDS_FRAME is returned from the previous call, | |
2201 | we dont have to check the baton content. */ | |
2202 | if (symbol_needs != SYMBOL_NEEDS_FRAME) | |
2203 | { | |
2204 | gdbarch *arch = baton.per_objfile->objfile->arch (); | |
2205 | gdb::array_view<const gdb_byte> sub_expr (baton.data, | |
2206 | baton.size); | |
2207 | symbol_needs | |
2208 | = dwarf2_get_symbol_read_needs (sub_expr, | |
2209 | baton.per_cu, | |
2210 | baton.per_objfile, | |
2211 | gdbarch_byte_order (arch), | |
2212 | baton.per_cu->addr_size (), | |
2213 | baton.per_cu->ref_addr_size (), | |
2214 | depth); | |
2215 | } | |
2216 | break; | |
2217 | } | |
2218 | ||
2219 | case DW_OP_const_type: | |
2220 | case DW_OP_GNU_const_type: | |
2221 | { | |
2222 | uint64_t uoffset; | |
2223 | op_ptr = safe_read_uleb128 (op_ptr, expr_end, &uoffset); | |
2224 | gdb_byte offset = *op_ptr++; | |
2225 | op_ptr += offset; | |
2226 | break; | |
2227 | } | |
2228 | ||
2229 | default: | |
2230 | error (_("Unhandled DWARF expression opcode 0x%x"), op); | |
2231 | } | |
2232 | ||
2233 | /* If it is known that a frame information is | |
2234 | needed we can stop parsing the expression. */ | |
2235 | if (symbol_needs == SYMBOL_NEEDS_FRAME) | |
2236 | break; | |
2237 | ||
2238 | insert_in_ops_to_visit (op_ptr); | |
2239 | } | |
2240 | ||
2241 | return symbol_needs; | |
4c2df51b DJ |
2242 | } |
2243 | ||
3cf03773 TT |
2244 | /* A helper function that throws an unimplemented error mentioning a |
2245 | given DWARF operator. */ | |
2246 | ||
621846f4 | 2247 | static void ATTRIBUTE_NORETURN |
3cf03773 | 2248 | unimplemented (unsigned int op) |
0d53c4c4 | 2249 | { |
f39c6ffd | 2250 | const char *name = get_DW_OP_name (op); |
b1bfef65 TT |
2251 | |
2252 | if (name) | |
2253 | error (_("DWARF operator %s cannot be translated to an agent expression"), | |
2254 | name); | |
2255 | else | |
1ba1b353 TT |
2256 | error (_("Unknown DWARF operator 0x%02x cannot be translated " |
2257 | "to an agent expression"), | |
b1bfef65 | 2258 | op); |
3cf03773 | 2259 | } |
08922a10 | 2260 | |
6c111a4e | 2261 | /* See dwarf2/loc.h. |
0fde2c53 DE |
2262 | |
2263 | This is basically a wrapper on gdbarch_dwarf2_reg_to_regnum so that we | |
2264 | can issue a complaint, which is better than having every target's | |
2265 | implementation of dwarf2_reg_to_regnum do it. */ | |
08922a10 | 2266 | |
d064d1be | 2267 | int |
0fde2c53 | 2268 | dwarf_reg_to_regnum (struct gdbarch *arch, int dwarf_reg) |
3cf03773 TT |
2269 | { |
2270 | int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg); | |
0fde2c53 | 2271 | |
3cf03773 | 2272 | if (reg == -1) |
0fde2c53 | 2273 | { |
b98664d3 | 2274 | complaint (_("bad DWARF register number %d"), dwarf_reg); |
0fde2c53 DE |
2275 | } |
2276 | return reg; | |
2277 | } | |
2278 | ||
2279 | /* Subroutine of dwarf_reg_to_regnum_or_error to simplify it. | |
2280 | Throw an error because DWARF_REG is bad. */ | |
2281 | ||
2282 | static void | |
2283 | throw_bad_regnum_error (ULONGEST dwarf_reg) | |
2284 | { | |
2285 | /* Still want to print -1 as "-1". | |
2286 | We *could* have int and ULONGEST versions of dwarf2_reg_to_regnum_or_error | |
2287 | but that's overkill for now. */ | |
2288 | if ((int) dwarf_reg == dwarf_reg) | |
2289 | error (_("Unable to access DWARF register number %d"), (int) dwarf_reg); | |
2290 | error (_("Unable to access DWARF register number %s"), | |
2291 | pulongest (dwarf_reg)); | |
2292 | } | |
2293 | ||
6c111a4e | 2294 | /* See dwarf2/loc.h. */ |
0fde2c53 DE |
2295 | |
2296 | int | |
2297 | dwarf_reg_to_regnum_or_error (struct gdbarch *arch, ULONGEST dwarf_reg) | |
2298 | { | |
2299 | int reg; | |
2300 | ||
2301 | if (dwarf_reg > INT_MAX) | |
2302 | throw_bad_regnum_error (dwarf_reg); | |
2303 | /* Yes, we will end up issuing a complaint and an error if DWARF_REG is | |
2304 | bad, but that's ok. */ | |
2305 | reg = dwarf_reg_to_regnum (arch, (int) dwarf_reg); | |
2306 | if (reg == -1) | |
2307 | throw_bad_regnum_error (dwarf_reg); | |
3cf03773 TT |
2308 | return reg; |
2309 | } | |
08922a10 | 2310 | |
3cf03773 TT |
2311 | /* A helper function that emits an access to memory. ARCH is the |
2312 | target architecture. EXPR is the expression which we are building. | |
2313 | NBITS is the number of bits we want to read. This emits the | |
2314 | opcodes needed to read the memory and then extract the desired | |
2315 | bits. */ | |
08922a10 | 2316 | |
3cf03773 TT |
2317 | static void |
2318 | access_memory (struct gdbarch *arch, struct agent_expr *expr, ULONGEST nbits) | |
08922a10 | 2319 | { |
3cf03773 TT |
2320 | ULONGEST nbytes = (nbits + 7) / 8; |
2321 | ||
9df7235c | 2322 | gdb_assert (nbytes > 0 && nbytes <= sizeof (LONGEST)); |
3cf03773 | 2323 | |
92bc6a20 | 2324 | if (expr->tracing) |
3cf03773 TT |
2325 | ax_trace_quick (expr, nbytes); |
2326 | ||
2327 | if (nbits <= 8) | |
2328 | ax_simple (expr, aop_ref8); | |
2329 | else if (nbits <= 16) | |
2330 | ax_simple (expr, aop_ref16); | |
2331 | else if (nbits <= 32) | |
2332 | ax_simple (expr, aop_ref32); | |
2333 | else | |
2334 | ax_simple (expr, aop_ref64); | |
2335 | ||
2336 | /* If we read exactly the number of bytes we wanted, we're done. */ | |
2337 | if (8 * nbytes == nbits) | |
2338 | return; | |
2339 | ||
d5a22e77 | 2340 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG) |
0d53c4c4 | 2341 | { |
3cf03773 TT |
2342 | /* On a bits-big-endian machine, we want the high-order |
2343 | NBITS. */ | |
2344 | ax_const_l (expr, 8 * nbytes - nbits); | |
2345 | ax_simple (expr, aop_rsh_unsigned); | |
0d53c4c4 | 2346 | } |
3cf03773 | 2347 | else |
0d53c4c4 | 2348 | { |
3cf03773 TT |
2349 | /* On a bits-little-endian box, we want the low-order NBITS. */ |
2350 | ax_zero_ext (expr, nbits); | |
0d53c4c4 | 2351 | } |
3cf03773 | 2352 | } |
0936ad1d | 2353 | |
3cf03773 TT |
2354 | /* Compile a DWARF location expression to an agent expression. |
2355 | ||
2356 | EXPR is the agent expression we are building. | |
2357 | LOC is the agent value we modify. | |
2358 | ARCH is the architecture. | |
2359 | ADDR_SIZE is the size of addresses, in bytes. | |
2360 | OP_PTR is the start of the location expression. | |
2361 | OP_END is one past the last byte of the location expression. | |
2362 | ||
2363 | This will throw an exception for various kinds of errors -- for | |
2364 | example, if the expression cannot be compiled, or if the expression | |
2365 | is invalid. */ | |
0936ad1d | 2366 | |
5707a07a | 2367 | static void |
9f6f94ff | 2368 | dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc, |
40f4af28 SM |
2369 | unsigned int addr_size, const gdb_byte *op_ptr, |
2370 | const gdb_byte *op_end, | |
4b167ea1 SM |
2371 | dwarf2_per_cu_data *per_cu, |
2372 | dwarf2_per_objfile *per_objfile) | |
3cf03773 | 2373 | { |
40f4af28 | 2374 | gdbarch *arch = expr->gdbarch; |
58414334 | 2375 | std::vector<int> dw_labels, patches; |
3cf03773 TT |
2376 | const gdb_byte * const base = op_ptr; |
2377 | const gdb_byte *previous_piece = op_ptr; | |
2378 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
2379 | ULONGEST bits_collected = 0; | |
2380 | unsigned int addr_size_bits = 8 * addr_size; | |
d5a22e77 | 2381 | bool bits_big_endian = byte_order == BFD_ENDIAN_BIG; |
0936ad1d | 2382 | |
58414334 | 2383 | std::vector<int> offsets (op_end - op_ptr, -1); |
0936ad1d | 2384 | |
3cf03773 TT |
2385 | /* By default we are making an address. */ |
2386 | loc->kind = axs_lvalue_memory; | |
0d45f56e | 2387 | |
3cf03773 TT |
2388 | while (op_ptr < op_end) |
2389 | { | |
aead7601 | 2390 | enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr; |
9fccedf7 DE |
2391 | uint64_t uoffset, reg; |
2392 | int64_t offset; | |
3cf03773 TT |
2393 | int i; |
2394 | ||
2395 | offsets[op_ptr - base] = expr->len; | |
2396 | ++op_ptr; | |
2397 | ||
2398 | /* Our basic approach to code generation is to map DWARF | |
2399 | operations directly to AX operations. However, there are | |
2400 | some differences. | |
2401 | ||
2402 | First, DWARF works on address-sized units, but AX always uses | |
2403 | LONGEST. For most operations we simply ignore this | |
2404 | difference; instead we generate sign extensions as needed | |
2405 | before division and comparison operations. It would be nice | |
2406 | to omit the sign extensions, but there is no way to determine | |
2407 | the size of the target's LONGEST. (This code uses the size | |
2408 | of the host LONGEST in some cases -- that is a bug but it is | |
2409 | difficult to fix.) | |
2410 | ||
2411 | Second, some DWARF operations cannot be translated to AX. | |
2412 | For these we simply fail. See | |
2413 | http://sourceware.org/bugzilla/show_bug.cgi?id=11662. */ | |
2414 | switch (op) | |
0936ad1d | 2415 | { |
3cf03773 TT |
2416 | case DW_OP_lit0: |
2417 | case DW_OP_lit1: | |
2418 | case DW_OP_lit2: | |
2419 | case DW_OP_lit3: | |
2420 | case DW_OP_lit4: | |
2421 | case DW_OP_lit5: | |
2422 | case DW_OP_lit6: | |
2423 | case DW_OP_lit7: | |
2424 | case DW_OP_lit8: | |
2425 | case DW_OP_lit9: | |
2426 | case DW_OP_lit10: | |
2427 | case DW_OP_lit11: | |
2428 | case DW_OP_lit12: | |
2429 | case DW_OP_lit13: | |
2430 | case DW_OP_lit14: | |
2431 | case DW_OP_lit15: | |
2432 | case DW_OP_lit16: | |
2433 | case DW_OP_lit17: | |
2434 | case DW_OP_lit18: | |
2435 | case DW_OP_lit19: | |
2436 | case DW_OP_lit20: | |
2437 | case DW_OP_lit21: | |
2438 | case DW_OP_lit22: | |
2439 | case DW_OP_lit23: | |
2440 | case DW_OP_lit24: | |
2441 | case DW_OP_lit25: | |
2442 | case DW_OP_lit26: | |
2443 | case DW_OP_lit27: | |
2444 | case DW_OP_lit28: | |
2445 | case DW_OP_lit29: | |
2446 | case DW_OP_lit30: | |
2447 | case DW_OP_lit31: | |
2448 | ax_const_l (expr, op - DW_OP_lit0); | |
2449 | break; | |
0d53c4c4 | 2450 | |
3cf03773 | 2451 | case DW_OP_addr: |
ac56253d | 2452 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
3cf03773 | 2453 | op_ptr += addr_size; |
ac56253d TT |
2454 | /* Some versions of GCC emit DW_OP_addr before |
2455 | DW_OP_GNU_push_tls_address. In this case the value is an | |
2456 | index, not an address. We don't support things like | |
2457 | branching between the address and the TLS op. */ | |
2458 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
4b167ea1 | 2459 | uoffset += per_objfile->objfile->text_section_offset (); |
ac56253d | 2460 | ax_const_l (expr, uoffset); |
3cf03773 | 2461 | break; |
4c2df51b | 2462 | |
3cf03773 TT |
2463 | case DW_OP_const1u: |
2464 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 1, byte_order)); | |
2465 | op_ptr += 1; | |
2466 | break; | |
fc3ecb3e | 2467 | |
3cf03773 TT |
2468 | case DW_OP_const1s: |
2469 | ax_const_l (expr, extract_signed_integer (op_ptr, 1, byte_order)); | |
2470 | op_ptr += 1; | |
2471 | break; | |
fc3ecb3e | 2472 | |
3cf03773 TT |
2473 | case DW_OP_const2u: |
2474 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 2, byte_order)); | |
2475 | op_ptr += 2; | |
2476 | break; | |
fc3ecb3e | 2477 | |
3cf03773 TT |
2478 | case DW_OP_const2s: |
2479 | ax_const_l (expr, extract_signed_integer (op_ptr, 2, byte_order)); | |
2480 | op_ptr += 2; | |
2481 | break; | |
fc3ecb3e | 2482 | |
3cf03773 TT |
2483 | case DW_OP_const4u: |
2484 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 4, byte_order)); | |
2485 | op_ptr += 4; | |
2486 | break; | |
fc3ecb3e | 2487 | |
3cf03773 TT |
2488 | case DW_OP_const4s: |
2489 | ax_const_l (expr, extract_signed_integer (op_ptr, 4, byte_order)); | |
2490 | op_ptr += 4; | |
2491 | break; | |
fc3ecb3e | 2492 | |
3cf03773 TT |
2493 | case DW_OP_const8u: |
2494 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 8, byte_order)); | |
2495 | op_ptr += 8; | |
2496 | break; | |
fc3ecb3e | 2497 | |
3cf03773 TT |
2498 | case DW_OP_const8s: |
2499 | ax_const_l (expr, extract_signed_integer (op_ptr, 8, byte_order)); | |
2500 | op_ptr += 8; | |
2501 | break; | |
fc3ecb3e | 2502 | |
3cf03773 | 2503 | case DW_OP_constu: |
f664829e | 2504 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
3cf03773 TT |
2505 | ax_const_l (expr, uoffset); |
2506 | break; | |
fc3ecb3e | 2507 | |
3cf03773 | 2508 | case DW_OP_consts: |
f664829e | 2509 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
3cf03773 TT |
2510 | ax_const_l (expr, offset); |
2511 | break; | |
9c238357 | 2512 | |
3cf03773 TT |
2513 | case DW_OP_reg0: |
2514 | case DW_OP_reg1: | |
2515 | case DW_OP_reg2: | |
2516 | case DW_OP_reg3: | |
2517 | case DW_OP_reg4: | |
2518 | case DW_OP_reg5: | |
2519 | case DW_OP_reg6: | |
2520 | case DW_OP_reg7: | |
2521 | case DW_OP_reg8: | |
2522 | case DW_OP_reg9: | |
2523 | case DW_OP_reg10: | |
2524 | case DW_OP_reg11: | |
2525 | case DW_OP_reg12: | |
2526 | case DW_OP_reg13: | |
2527 | case DW_OP_reg14: | |
2528 | case DW_OP_reg15: | |
2529 | case DW_OP_reg16: | |
2530 | case DW_OP_reg17: | |
2531 | case DW_OP_reg18: | |
2532 | case DW_OP_reg19: | |
2533 | case DW_OP_reg20: | |
2534 | case DW_OP_reg21: | |
2535 | case DW_OP_reg22: | |
2536 | case DW_OP_reg23: | |
2537 | case DW_OP_reg24: | |
2538 | case DW_OP_reg25: | |
2539 | case DW_OP_reg26: | |
2540 | case DW_OP_reg27: | |
2541 | case DW_OP_reg28: | |
2542 | case DW_OP_reg29: | |
2543 | case DW_OP_reg30: | |
2544 | case DW_OP_reg31: | |
2545 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
0fde2c53 | 2546 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_reg0); |
3cf03773 TT |
2547 | loc->kind = axs_lvalue_register; |
2548 | break; | |
9c238357 | 2549 | |
3cf03773 | 2550 | case DW_OP_regx: |
f664829e | 2551 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 | 2552 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); |
0fde2c53 | 2553 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
2554 | loc->kind = axs_lvalue_register; |
2555 | break; | |
08922a10 | 2556 | |
3cf03773 TT |
2557 | case DW_OP_implicit_value: |
2558 | { | |
9fccedf7 | 2559 | uint64_t len; |
3cf03773 | 2560 | |
f664829e | 2561 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &len); |
3cf03773 TT |
2562 | if (op_ptr + len > op_end) |
2563 | error (_("DW_OP_implicit_value: too few bytes available.")); | |
2564 | if (len > sizeof (ULONGEST)) | |
2565 | error (_("Cannot translate DW_OP_implicit_value of %d bytes"), | |
2566 | (int) len); | |
2567 | ||
2568 | ax_const_l (expr, extract_unsigned_integer (op_ptr, len, | |
2569 | byte_order)); | |
2570 | op_ptr += len; | |
2571 | dwarf_expr_require_composition (op_ptr, op_end, | |
2572 | "DW_OP_implicit_value"); | |
2573 | ||
2574 | loc->kind = axs_rvalue; | |
2575 | } | |
2576 | break; | |
08922a10 | 2577 | |
3cf03773 TT |
2578 | case DW_OP_stack_value: |
2579 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value"); | |
2580 | loc->kind = axs_rvalue; | |
2581 | break; | |
08922a10 | 2582 | |
3cf03773 TT |
2583 | case DW_OP_breg0: |
2584 | case DW_OP_breg1: | |
2585 | case DW_OP_breg2: | |
2586 | case DW_OP_breg3: | |
2587 | case DW_OP_breg4: | |
2588 | case DW_OP_breg5: | |
2589 | case DW_OP_breg6: | |
2590 | case DW_OP_breg7: | |
2591 | case DW_OP_breg8: | |
2592 | case DW_OP_breg9: | |
2593 | case DW_OP_breg10: | |
2594 | case DW_OP_breg11: | |
2595 | case DW_OP_breg12: | |
2596 | case DW_OP_breg13: | |
2597 | case DW_OP_breg14: | |
2598 | case DW_OP_breg15: | |
2599 | case DW_OP_breg16: | |
2600 | case DW_OP_breg17: | |
2601 | case DW_OP_breg18: | |
2602 | case DW_OP_breg19: | |
2603 | case DW_OP_breg20: | |
2604 | case DW_OP_breg21: | |
2605 | case DW_OP_breg22: | |
2606 | case DW_OP_breg23: | |
2607 | case DW_OP_breg24: | |
2608 | case DW_OP_breg25: | |
2609 | case DW_OP_breg26: | |
2610 | case DW_OP_breg27: | |
2611 | case DW_OP_breg28: | |
2612 | case DW_OP_breg29: | |
2613 | case DW_OP_breg30: | |
2614 | case DW_OP_breg31: | |
f664829e | 2615 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
0fde2c53 | 2616 | i = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_breg0); |
3cf03773 TT |
2617 | ax_reg (expr, i); |
2618 | if (offset != 0) | |
2619 | { | |
2620 | ax_const_l (expr, offset); | |
2621 | ax_simple (expr, aop_add); | |
2622 | } | |
2623 | break; | |
fc3ecb3e | 2624 | |
3cf03773 TT |
2625 | case DW_OP_bregx: |
2626 | { | |
f664829e DE |
2627 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
2628 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
0fde2c53 | 2629 | i = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
2630 | ax_reg (expr, i); |
2631 | if (offset != 0) | |
2632 | { | |
2633 | ax_const_l (expr, offset); | |
2634 | ax_simple (expr, aop_add); | |
2635 | } | |
2636 | } | |
2637 | break; | |
fc3ecb3e | 2638 | |
3cf03773 TT |
2639 | case DW_OP_fbreg: |
2640 | { | |
2641 | const gdb_byte *datastart; | |
2642 | size_t datalen; | |
3977b71f | 2643 | const struct block *b; |
3cf03773 | 2644 | struct symbol *framefunc; |
08922a10 | 2645 | |
3cf03773 TT |
2646 | b = block_for_pc (expr->scope); |
2647 | ||
2648 | if (!b) | |
2649 | error (_("No block found for address")); | |
2650 | ||
2651 | framefunc = block_linkage_function (b); | |
2652 | ||
2653 | if (!framefunc) | |
2654 | error (_("No function found for block")); | |
2655 | ||
af945b75 TT |
2656 | func_get_frame_base_dwarf_block (framefunc, expr->scope, |
2657 | &datastart, &datalen); | |
3cf03773 | 2658 | |
f664829e | 2659 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
40f4af28 | 2660 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, datastart, |
4b167ea1 SM |
2661 | datastart + datalen, per_cu, |
2662 | per_objfile); | |
d84cf7eb TT |
2663 | if (loc->kind == axs_lvalue_register) |
2664 | require_rvalue (expr, loc); | |
3cf03773 TT |
2665 | |
2666 | if (offset != 0) | |
2667 | { | |
2668 | ax_const_l (expr, offset); | |
2669 | ax_simple (expr, aop_add); | |
2670 | } | |
2671 | ||
2672 | loc->kind = axs_lvalue_memory; | |
2673 | } | |
08922a10 | 2674 | break; |
08922a10 | 2675 | |
3cf03773 TT |
2676 | case DW_OP_dup: |
2677 | ax_simple (expr, aop_dup); | |
2678 | break; | |
08922a10 | 2679 | |
3cf03773 TT |
2680 | case DW_OP_drop: |
2681 | ax_simple (expr, aop_pop); | |
2682 | break; | |
08922a10 | 2683 | |
3cf03773 TT |
2684 | case DW_OP_pick: |
2685 | offset = *op_ptr++; | |
c7f96d2b | 2686 | ax_pick (expr, offset); |
3cf03773 | 2687 | break; |
fc3ecb3e | 2688 | |
3cf03773 TT |
2689 | case DW_OP_swap: |
2690 | ax_simple (expr, aop_swap); | |
2691 | break; | |
08922a10 | 2692 | |
3cf03773 | 2693 | case DW_OP_over: |
c7f96d2b | 2694 | ax_pick (expr, 1); |
3cf03773 | 2695 | break; |
08922a10 | 2696 | |
3cf03773 | 2697 | case DW_OP_rot: |
c7f96d2b | 2698 | ax_simple (expr, aop_rot); |
3cf03773 | 2699 | break; |
08922a10 | 2700 | |
3cf03773 TT |
2701 | case DW_OP_deref: |
2702 | case DW_OP_deref_size: | |
2703 | { | |
2704 | int size; | |
08922a10 | 2705 | |
3cf03773 TT |
2706 | if (op == DW_OP_deref_size) |
2707 | size = *op_ptr++; | |
2708 | else | |
2709 | size = addr_size; | |
2710 | ||
9df7235c | 2711 | if (size != 1 && size != 2 && size != 4 && size != 8) |
f3cec7e6 HZ |
2712 | error (_("Unsupported size %d in %s"), |
2713 | size, get_DW_OP_name (op)); | |
9df7235c | 2714 | access_memory (arch, expr, size * TARGET_CHAR_BIT); |
3cf03773 TT |
2715 | } |
2716 | break; | |
2717 | ||
2718 | case DW_OP_abs: | |
2719 | /* Sign extend the operand. */ | |
2720 | ax_ext (expr, addr_size_bits); | |
2721 | ax_simple (expr, aop_dup); | |
2722 | ax_const_l (expr, 0); | |
2723 | ax_simple (expr, aop_less_signed); | |
2724 | ax_simple (expr, aop_log_not); | |
2725 | i = ax_goto (expr, aop_if_goto); | |
2726 | /* We have to emit 0 - X. */ | |
2727 | ax_const_l (expr, 0); | |
2728 | ax_simple (expr, aop_swap); | |
2729 | ax_simple (expr, aop_sub); | |
2730 | ax_label (expr, i, expr->len); | |
2731 | break; | |
2732 | ||
2733 | case DW_OP_neg: | |
2734 | /* No need to sign extend here. */ | |
2735 | ax_const_l (expr, 0); | |
2736 | ax_simple (expr, aop_swap); | |
2737 | ax_simple (expr, aop_sub); | |
2738 | break; | |
2739 | ||
2740 | case DW_OP_not: | |
2741 | /* Sign extend the operand. */ | |
2742 | ax_ext (expr, addr_size_bits); | |
2743 | ax_simple (expr, aop_bit_not); | |
2744 | break; | |
2745 | ||
2746 | case DW_OP_plus_uconst: | |
f664829e | 2747 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 TT |
2748 | /* It would be really weird to emit `DW_OP_plus_uconst 0', |
2749 | but we micro-optimize anyhow. */ | |
2750 | if (reg != 0) | |
2751 | { | |
2752 | ax_const_l (expr, reg); | |
2753 | ax_simple (expr, aop_add); | |
2754 | } | |
2755 | break; | |
2756 | ||
2757 | case DW_OP_and: | |
2758 | ax_simple (expr, aop_bit_and); | |
2759 | break; | |
2760 | ||
2761 | case DW_OP_div: | |
2762 | /* Sign extend the operands. */ | |
2763 | ax_ext (expr, addr_size_bits); | |
2764 | ax_simple (expr, aop_swap); | |
2765 | ax_ext (expr, addr_size_bits); | |
2766 | ax_simple (expr, aop_swap); | |
2767 | ax_simple (expr, aop_div_signed); | |
08922a10 SS |
2768 | break; |
2769 | ||
3cf03773 TT |
2770 | case DW_OP_minus: |
2771 | ax_simple (expr, aop_sub); | |
2772 | break; | |
2773 | ||
2774 | case DW_OP_mod: | |
2775 | ax_simple (expr, aop_rem_unsigned); | |
2776 | break; | |
2777 | ||
2778 | case DW_OP_mul: | |
2779 | ax_simple (expr, aop_mul); | |
2780 | break; | |
2781 | ||
2782 | case DW_OP_or: | |
2783 | ax_simple (expr, aop_bit_or); | |
2784 | break; | |
2785 | ||
2786 | case DW_OP_plus: | |
2787 | ax_simple (expr, aop_add); | |
2788 | break; | |
2789 | ||
2790 | case DW_OP_shl: | |
2791 | ax_simple (expr, aop_lsh); | |
2792 | break; | |
2793 | ||
2794 | case DW_OP_shr: | |
2795 | ax_simple (expr, aop_rsh_unsigned); | |
2796 | break; | |
2797 | ||
2798 | case DW_OP_shra: | |
2799 | ax_simple (expr, aop_rsh_signed); | |
2800 | break; | |
2801 | ||
2802 | case DW_OP_xor: | |
2803 | ax_simple (expr, aop_bit_xor); | |
2804 | break; | |
2805 | ||
2806 | case DW_OP_le: | |
2807 | /* Sign extend the operands. */ | |
2808 | ax_ext (expr, addr_size_bits); | |
2809 | ax_simple (expr, aop_swap); | |
2810 | ax_ext (expr, addr_size_bits); | |
2811 | /* Note no swap here: A <= B is !(B < A). */ | |
2812 | ax_simple (expr, aop_less_signed); | |
2813 | ax_simple (expr, aop_log_not); | |
2814 | break; | |
2815 | ||
2816 | case DW_OP_ge: | |
2817 | /* Sign extend the operands. */ | |
2818 | ax_ext (expr, addr_size_bits); | |
2819 | ax_simple (expr, aop_swap); | |
2820 | ax_ext (expr, addr_size_bits); | |
2821 | ax_simple (expr, aop_swap); | |
2822 | /* A >= B is !(A < B). */ | |
2823 | ax_simple (expr, aop_less_signed); | |
2824 | ax_simple (expr, aop_log_not); | |
2825 | break; | |
2826 | ||
2827 | case DW_OP_eq: | |
2828 | /* Sign extend the operands. */ | |
2829 | ax_ext (expr, addr_size_bits); | |
2830 | ax_simple (expr, aop_swap); | |
2831 | ax_ext (expr, addr_size_bits); | |
2832 | /* No need for a second swap here. */ | |
2833 | ax_simple (expr, aop_equal); | |
2834 | break; | |
2835 | ||
2836 | case DW_OP_lt: | |
2837 | /* Sign extend the operands. */ | |
2838 | ax_ext (expr, addr_size_bits); | |
2839 | ax_simple (expr, aop_swap); | |
2840 | ax_ext (expr, addr_size_bits); | |
2841 | ax_simple (expr, aop_swap); | |
2842 | ax_simple (expr, aop_less_signed); | |
2843 | break; | |
2844 | ||
2845 | case DW_OP_gt: | |
2846 | /* Sign extend the operands. */ | |
2847 | ax_ext (expr, addr_size_bits); | |
2848 | ax_simple (expr, aop_swap); | |
2849 | ax_ext (expr, addr_size_bits); | |
2850 | /* Note no swap here: A > B is B < A. */ | |
2851 | ax_simple (expr, aop_less_signed); | |
2852 | break; | |
2853 | ||
2854 | case DW_OP_ne: | |
2855 | /* Sign extend the operands. */ | |
2856 | ax_ext (expr, addr_size_bits); | |
2857 | ax_simple (expr, aop_swap); | |
2858 | ax_ext (expr, addr_size_bits); | |
2859 | /* No need for a swap here. */ | |
2860 | ax_simple (expr, aop_equal); | |
2861 | ax_simple (expr, aop_log_not); | |
2862 | break; | |
2863 | ||
2864 | case DW_OP_call_frame_cfa: | |
a8fd5589 TT |
2865 | { |
2866 | int regnum; | |
2867 | CORE_ADDR text_offset; | |
2868 | LONGEST off; | |
2869 | const gdb_byte *cfa_start, *cfa_end; | |
2870 | ||
2871 | if (dwarf2_fetch_cfa_info (arch, expr->scope, per_cu, | |
2872 | ®num, &off, | |
2873 | &text_offset, &cfa_start, &cfa_end)) | |
2874 | { | |
2875 | /* Register. */ | |
2876 | ax_reg (expr, regnum); | |
2877 | if (off != 0) | |
2878 | { | |
2879 | ax_const_l (expr, off); | |
2880 | ax_simple (expr, aop_add); | |
2881 | } | |
2882 | } | |
2883 | else | |
2884 | { | |
2885 | /* Another expression. */ | |
2886 | ax_const_l (expr, text_offset); | |
40f4af28 | 2887 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, cfa_start, |
4b167ea1 | 2888 | cfa_end, per_cu, per_objfile); |
a8fd5589 TT |
2889 | } |
2890 | ||
2891 | loc->kind = axs_lvalue_memory; | |
2892 | } | |
3cf03773 TT |
2893 | break; |
2894 | ||
2895 | case DW_OP_GNU_push_tls_address: | |
4aa4e28b | 2896 | case DW_OP_form_tls_address: |
3cf03773 TT |
2897 | unimplemented (op); |
2898 | break; | |
2899 | ||
08412b07 JB |
2900 | case DW_OP_push_object_address: |
2901 | unimplemented (op); | |
2902 | break; | |
2903 | ||
3cf03773 TT |
2904 | case DW_OP_skip: |
2905 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
2906 | op_ptr += 2; | |
2907 | i = ax_goto (expr, aop_goto); | |
58414334 TT |
2908 | dw_labels.push_back (op_ptr + offset - base); |
2909 | patches.push_back (i); | |
3cf03773 TT |
2910 | break; |
2911 | ||
2912 | case DW_OP_bra: | |
2913 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
2914 | op_ptr += 2; | |
2915 | /* Zero extend the operand. */ | |
2916 | ax_zero_ext (expr, addr_size_bits); | |
2917 | i = ax_goto (expr, aop_if_goto); | |
58414334 TT |
2918 | dw_labels.push_back (op_ptr + offset - base); |
2919 | patches.push_back (i); | |
3cf03773 TT |
2920 | break; |
2921 | ||
2922 | case DW_OP_nop: | |
2923 | break; | |
2924 | ||
dda83cd7 | 2925 | case DW_OP_piece: |
3cf03773 | 2926 | case DW_OP_bit_piece: |
08922a10 | 2927 | { |
b926417a | 2928 | uint64_t size; |
3cf03773 TT |
2929 | |
2930 | if (op_ptr - 1 == previous_piece) | |
2931 | error (_("Cannot translate empty pieces to agent expressions")); | |
2932 | previous_piece = op_ptr - 1; | |
2933 | ||
dda83cd7 | 2934 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &size); |
3cf03773 TT |
2935 | if (op == DW_OP_piece) |
2936 | { | |
2937 | size *= 8; | |
b926417a | 2938 | uoffset = 0; |
3cf03773 TT |
2939 | } |
2940 | else | |
b926417a | 2941 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
08922a10 | 2942 | |
3cf03773 TT |
2943 | if (bits_collected + size > 8 * sizeof (LONGEST)) |
2944 | error (_("Expression pieces exceed word size")); | |
2945 | ||
2946 | /* Access the bits. */ | |
2947 | switch (loc->kind) | |
2948 | { | |
2949 | case axs_lvalue_register: | |
2950 | ax_reg (expr, loc->u.reg); | |
2951 | break; | |
2952 | ||
2953 | case axs_lvalue_memory: | |
2954 | /* Offset the pointer, if needed. */ | |
b926417a | 2955 | if (uoffset > 8) |
3cf03773 | 2956 | { |
b926417a | 2957 | ax_const_l (expr, uoffset / 8); |
3cf03773 | 2958 | ax_simple (expr, aop_add); |
b926417a | 2959 | uoffset %= 8; |
3cf03773 TT |
2960 | } |
2961 | access_memory (arch, expr, size); | |
2962 | break; | |
2963 | } | |
2964 | ||
2965 | /* For a bits-big-endian target, shift up what we already | |
2966 | have. For a bits-little-endian target, shift up the | |
2967 | new data. Note that there is a potential bug here if | |
2968 | the DWARF expression leaves multiple values on the | |
2969 | stack. */ | |
2970 | if (bits_collected > 0) | |
2971 | { | |
2972 | if (bits_big_endian) | |
2973 | { | |
2974 | ax_simple (expr, aop_swap); | |
2975 | ax_const_l (expr, size); | |
2976 | ax_simple (expr, aop_lsh); | |
2977 | /* We don't need a second swap here, because | |
2978 | aop_bit_or is symmetric. */ | |
2979 | } | |
2980 | else | |
2981 | { | |
2982 | ax_const_l (expr, size); | |
2983 | ax_simple (expr, aop_lsh); | |
2984 | } | |
2985 | ax_simple (expr, aop_bit_or); | |
2986 | } | |
2987 | ||
2988 | bits_collected += size; | |
2989 | loc->kind = axs_rvalue; | |
08922a10 SS |
2990 | } |
2991 | break; | |
08922a10 | 2992 | |
3cf03773 TT |
2993 | case DW_OP_GNU_uninit: |
2994 | unimplemented (op); | |
2995 | ||
2996 | case DW_OP_call2: | |
2997 | case DW_OP_call4: | |
2998 | { | |
2999 | struct dwarf2_locexpr_baton block; | |
3000 | int size = (op == DW_OP_call2 ? 2 : 4); | |
3001 | ||
3002 | uoffset = extract_unsigned_integer (op_ptr, size, byte_order); | |
3003 | op_ptr += size; | |
3004 | ||
041d9819 SM |
3005 | auto get_frame_pc_from_expr = [expr] () |
3006 | { | |
3007 | return expr->scope; | |
3008 | }; | |
b926417a | 3009 | cu_offset cuoffset = (cu_offset) uoffset; |
14095eb3 | 3010 | block = dwarf2_fetch_die_loc_cu_off (cuoffset, per_cu, per_objfile, |
041d9819 | 3011 | get_frame_pc_from_expr); |
3cf03773 TT |
3012 | |
3013 | /* DW_OP_call_ref is currently not supported. */ | |
3014 | gdb_assert (block.per_cu == per_cu); | |
3015 | ||
40f4af28 | 3016 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, block.data, |
4b167ea1 SM |
3017 | block.data + block.size, per_cu, |
3018 | per_objfile); | |
3cf03773 TT |
3019 | } |
3020 | break; | |
3021 | ||
3022 | case DW_OP_call_ref: | |
3023 | unimplemented (op); | |
3024 | ||
a6b786da KB |
3025 | case DW_OP_GNU_variable_value: |
3026 | unimplemented (op); | |
3027 | ||
3cf03773 | 3028 | default: |
b1bfef65 | 3029 | unimplemented (op); |
08922a10 | 3030 | } |
08922a10 | 3031 | } |
3cf03773 TT |
3032 | |
3033 | /* Patch all the branches we emitted. */ | |
b926417a | 3034 | for (int i = 0; i < patches.size (); ++i) |
3cf03773 | 3035 | { |
58414334 | 3036 | int targ = offsets[dw_labels[i]]; |
3cf03773 TT |
3037 | if (targ == -1) |
3038 | internal_error (__FILE__, __LINE__, _("invalid label")); | |
58414334 | 3039 | ax_label (expr, patches[i], targ); |
3cf03773 | 3040 | } |
08922a10 SS |
3041 | } |
3042 | ||
4c2df51b DJ |
3043 | \f |
3044 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
3045 | evaluator to calculate the location. */ | |
3046 | static struct value * | |
3047 | locexpr_read_variable (struct symbol *symbol, struct frame_info *frame) | |
3048 | { | |
9a3c8263 SM |
3049 | struct dwarf2_locexpr_baton *dlbaton |
3050 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
4c2df51b | 3051 | struct value *val; |
9a619af0 | 3052 | |
5f9c5a63 | 3053 | val = dwarf2_evaluate_loc_desc (symbol->type (), frame, dlbaton->data, |
9f47c707 SM |
3054 | dlbaton->size, dlbaton->per_cu, |
3055 | dlbaton->per_objfile); | |
4c2df51b DJ |
3056 | |
3057 | return val; | |
3058 | } | |
3059 | ||
e18b2753 JK |
3060 | /* Return the value of SYMBOL in FRAME at (callee) FRAME's function |
3061 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
3062 | will be thrown. */ | |
3063 | ||
3064 | static struct value * | |
3065 | locexpr_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
3066 | { | |
9a3c8263 SM |
3067 | struct dwarf2_locexpr_baton *dlbaton |
3068 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 | 3069 | |
5f9c5a63 | 3070 | return value_of_dwarf_block_entry (symbol->type (), frame, dlbaton->data, |
e18b2753 JK |
3071 | dlbaton->size); |
3072 | } | |
3073 | ||
0b31a4bc TT |
3074 | /* Implementation of get_symbol_read_needs from |
3075 | symbol_computed_ops. */ | |
3076 | ||
3077 | static enum symbol_needs_kind | |
3078 | locexpr_get_symbol_read_needs (struct symbol *symbol) | |
4c2df51b | 3079 | { |
9a3c8263 SM |
3080 | struct dwarf2_locexpr_baton *dlbaton |
3081 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
9a619af0 | 3082 | |
183657ed ZZ |
3083 | gdbarch *arch = dlbaton->per_objfile->objfile->arch (); |
3084 | gdb::array_view<const gdb_byte> expr (dlbaton->data, dlbaton->size); | |
3085 | ||
3086 | return dwarf2_get_symbol_read_needs (expr, | |
3087 | dlbaton->per_cu, | |
3088 | dlbaton->per_objfile, | |
3089 | gdbarch_byte_order (arch), | |
3090 | dlbaton->per_cu->addr_size (), | |
3091 | dlbaton->per_cu->ref_addr_size ()); | |
4c2df51b DJ |
3092 | } |
3093 | ||
9eae7c52 TT |
3094 | /* Return true if DATA points to the end of a piece. END is one past |
3095 | the last byte in the expression. */ | |
3096 | ||
3097 | static int | |
3098 | piece_end_p (const gdb_byte *data, const gdb_byte *end) | |
3099 | { | |
3100 | return data == end || data[0] == DW_OP_piece || data[0] == DW_OP_bit_piece; | |
3101 | } | |
3102 | ||
5e44ecb3 TT |
3103 | /* Helper for locexpr_describe_location_piece that finds the name of a |
3104 | DWARF register. */ | |
3105 | ||
3106 | static const char * | |
3107 | locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum) | |
3108 | { | |
3109 | int regnum; | |
3110 | ||
0fde2c53 DE |
3111 | /* This doesn't use dwarf_reg_to_regnum_or_error on purpose. |
3112 | We'd rather print *something* here than throw an error. */ | |
3113 | regnum = dwarf_reg_to_regnum (gdbarch, dwarf_regnum); | |
3114 | /* gdbarch_register_name may just return "", return something more | |
3115 | descriptive for bad register numbers. */ | |
3116 | if (regnum == -1) | |
3117 | { | |
3118 | /* The text is output as "$bad_register_number". | |
3119 | That is why we use the underscores. */ | |
3120 | return _("bad_register_number"); | |
3121 | } | |
5e44ecb3 TT |
3122 | return gdbarch_register_name (gdbarch, regnum); |
3123 | } | |
3124 | ||
9eae7c52 TT |
3125 | /* Nicely describe a single piece of a location, returning an updated |
3126 | position in the bytecode sequence. This function cannot recognize | |
3127 | all locations; if a location is not recognized, it simply returns | |
f664829e DE |
3128 | DATA. If there is an error during reading, e.g. we run off the end |
3129 | of the buffer, an error is thrown. */ | |
08922a10 | 3130 | |
0d45f56e | 3131 | static const gdb_byte * |
08922a10 | 3132 | locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream, |
82ca3f51 SM |
3133 | CORE_ADDR addr, dwarf2_per_cu_data *per_cu, |
3134 | dwarf2_per_objfile *per_objfile, | |
9eae7c52 | 3135 | const gdb_byte *data, const gdb_byte *end, |
0d45f56e | 3136 | unsigned int addr_size) |
4c2df51b | 3137 | { |
82ca3f51 | 3138 | objfile *objfile = per_objfile->objfile; |
08feed99 | 3139 | struct gdbarch *gdbarch = objfile->arch (); |
49f6c839 | 3140 | size_t leb128_size; |
08922a10 SS |
3141 | |
3142 | if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31) | |
3143 | { | |
6cb06a8c TT |
3144 | gdb_printf (stream, _("a variable in $%s"), |
3145 | locexpr_regname (gdbarch, data[0] - DW_OP_reg0)); | |
08922a10 SS |
3146 | data += 1; |
3147 | } | |
3148 | else if (data[0] == DW_OP_regx) | |
3149 | { | |
9fccedf7 | 3150 | uint64_t reg; |
4c2df51b | 3151 | |
f664829e | 3152 | data = safe_read_uleb128 (data + 1, end, ®); |
6cb06a8c TT |
3153 | gdb_printf (stream, _("a variable in $%s"), |
3154 | locexpr_regname (gdbarch, reg)); | |
08922a10 SS |
3155 | } |
3156 | else if (data[0] == DW_OP_fbreg) | |
4c2df51b | 3157 | { |
3977b71f | 3158 | const struct block *b; |
08922a10 SS |
3159 | struct symbol *framefunc; |
3160 | int frame_reg = 0; | |
9fccedf7 | 3161 | int64_t frame_offset; |
7155d578 | 3162 | const gdb_byte *base_data, *new_data, *save_data = data; |
08922a10 | 3163 | size_t base_size; |
9fccedf7 | 3164 | int64_t base_offset = 0; |
08922a10 | 3165 | |
f664829e | 3166 | new_data = safe_read_sleb128 (data + 1, end, &frame_offset); |
9eae7c52 TT |
3167 | if (!piece_end_p (new_data, end)) |
3168 | return data; | |
3169 | data = new_data; | |
3170 | ||
08922a10 SS |
3171 | b = block_for_pc (addr); |
3172 | ||
3173 | if (!b) | |
3174 | error (_("No block found for address for symbol \"%s\"."), | |
987012b8 | 3175 | symbol->print_name ()); |
08922a10 SS |
3176 | |
3177 | framefunc = block_linkage_function (b); | |
3178 | ||
3179 | if (!framefunc) | |
3180 | error (_("No function found for block for symbol \"%s\"."), | |
987012b8 | 3181 | symbol->print_name ()); |
08922a10 | 3182 | |
af945b75 | 3183 | func_get_frame_base_dwarf_block (framefunc, addr, &base_data, &base_size); |
08922a10 SS |
3184 | |
3185 | if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31) | |
3186 | { | |
0d45f56e | 3187 | const gdb_byte *buf_end; |
08922a10 SS |
3188 | |
3189 | frame_reg = base_data[0] - DW_OP_breg0; | |
f664829e DE |
3190 | buf_end = safe_read_sleb128 (base_data + 1, base_data + base_size, |
3191 | &base_offset); | |
08922a10 | 3192 | if (buf_end != base_data + base_size) |
3e43a32a MS |
3193 | error (_("Unexpected opcode after " |
3194 | "DW_OP_breg%u for symbol \"%s\"."), | |
987012b8 | 3195 | frame_reg, symbol->print_name ()); |
08922a10 SS |
3196 | } |
3197 | else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31) | |
3198 | { | |
3199 | /* The frame base is just the register, with no offset. */ | |
3200 | frame_reg = base_data[0] - DW_OP_reg0; | |
3201 | base_offset = 0; | |
3202 | } | |
3203 | else | |
3204 | { | |
3205 | /* We don't know what to do with the frame base expression, | |
3206 | so we can't trace this variable; give up. */ | |
7155d578 | 3207 | return save_data; |
08922a10 SS |
3208 | } |
3209 | ||
6cb06a8c TT |
3210 | gdb_printf (stream, |
3211 | _("a variable at frame base reg $%s offset %s+%s"), | |
3212 | locexpr_regname (gdbarch, frame_reg), | |
3213 | plongest (base_offset), plongest (frame_offset)); | |
08922a10 | 3214 | } |
9eae7c52 TT |
3215 | else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31 |
3216 | && piece_end_p (data, end)) | |
08922a10 | 3217 | { |
9fccedf7 | 3218 | int64_t offset; |
08922a10 | 3219 | |
f664829e | 3220 | data = safe_read_sleb128 (data + 1, end, &offset); |
08922a10 | 3221 | |
6cb06a8c TT |
3222 | gdb_printf (stream, |
3223 | _("a variable at offset %s from base reg $%s"), | |
3224 | plongest (offset), | |
3225 | locexpr_regname (gdbarch, data[0] - DW_OP_breg0)); | |
4c2df51b DJ |
3226 | } |
3227 | ||
c3228f12 EZ |
3228 | /* The location expression for a TLS variable looks like this (on a |
3229 | 64-bit LE machine): | |
3230 | ||
3231 | DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0 | |
dda83cd7 | 3232 | (DW_OP_addr: 4; DW_OP_GNU_push_tls_address) |
09d8bd00 | 3233 | |
c3228f12 EZ |
3234 | 0x3 is the encoding for DW_OP_addr, which has an operand as long |
3235 | as the size of an address on the target machine (here is 8 | |
09d8bd00 TT |
3236 | bytes). Note that more recent version of GCC emit DW_OP_const4u |
3237 | or DW_OP_const8u, depending on address size, rather than | |
0963b4bd MS |
3238 | DW_OP_addr. 0xe0 is the encoding for DW_OP_GNU_push_tls_address. |
3239 | The operand represents the offset at which the variable is within | |
3240 | the thread local storage. */ | |
c3228f12 | 3241 | |
9eae7c52 | 3242 | else if (data + 1 + addr_size < end |
09d8bd00 TT |
3243 | && (data[0] == DW_OP_addr |
3244 | || (addr_size == 4 && data[0] == DW_OP_const4u) | |
3245 | || (addr_size == 8 && data[0] == DW_OP_const8u)) | |
4aa4e28b TT |
3246 | && (data[1 + addr_size] == DW_OP_GNU_push_tls_address |
3247 | || data[1 + addr_size] == DW_OP_form_tls_address) | |
9eae7c52 | 3248 | && piece_end_p (data + 2 + addr_size, end)) |
08922a10 | 3249 | { |
d4a087c7 UW |
3250 | ULONGEST offset; |
3251 | offset = extract_unsigned_integer (data + 1, addr_size, | |
3252 | gdbarch_byte_order (gdbarch)); | |
9a619af0 | 3253 | |
6cb06a8c TT |
3254 | gdb_printf (stream, |
3255 | _("a thread-local variable at offset 0x%s " | |
3256 | "in the thread-local storage for `%s'"), | |
3257 | phex_nz (offset, addr_size), objfile_name (objfile)); | |
08922a10 SS |
3258 | |
3259 | data += 1 + addr_size + 1; | |
3260 | } | |
49f6c839 DE |
3261 | |
3262 | /* With -gsplit-dwarf a TLS variable can also look like this: | |
3263 | DW_AT_location : 3 byte block: fc 4 e0 | |
dda83cd7 | 3264 | (DW_OP_GNU_const_index: 4; |
49f6c839 DE |
3265 | DW_OP_GNU_push_tls_address) */ |
3266 | else if (data + 3 <= end | |
3267 | && data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end | |
3268 | && data[0] == DW_OP_GNU_const_index | |
3269 | && leb128_size > 0 | |
4aa4e28b TT |
3270 | && (data[1 + leb128_size] == DW_OP_GNU_push_tls_address |
3271 | || data[1 + leb128_size] == DW_OP_form_tls_address) | |
49f6c839 DE |
3272 | && piece_end_p (data + 2 + leb128_size, end)) |
3273 | { | |
a55c1f32 | 3274 | uint64_t offset; |
49f6c839 DE |
3275 | |
3276 | data = safe_read_uleb128 (data + 1, end, &offset); | |
82ca3f51 | 3277 | offset = dwarf2_read_addr_index (per_cu, per_objfile, offset); |
6cb06a8c TT |
3278 | gdb_printf (stream, |
3279 | _("a thread-local variable at offset 0x%s " | |
3280 | "in the thread-local storage for `%s'"), | |
3281 | phex_nz (offset, addr_size), objfile_name (objfile)); | |
49f6c839 DE |
3282 | ++data; |
3283 | } | |
3284 | ||
9eae7c52 TT |
3285 | else if (data[0] >= DW_OP_lit0 |
3286 | && data[0] <= DW_OP_lit31 | |
3287 | && data + 1 < end | |
3288 | && data[1] == DW_OP_stack_value) | |
3289 | { | |
6cb06a8c | 3290 | gdb_printf (stream, _("the constant %d"), data[0] - DW_OP_lit0); |
9eae7c52 TT |
3291 | data += 2; |
3292 | } | |
3293 | ||
3294 | return data; | |
3295 | } | |
3296 | ||
3297 | /* Disassemble an expression, stopping at the end of a piece or at the | |
3298 | end of the expression. Returns a pointer to the next unread byte | |
3299 | in the input expression. If ALL is nonzero, then this function | |
f664829e DE |
3300 | will keep going until it reaches the end of the expression. |
3301 | If there is an error during reading, e.g. we run off the end | |
3302 | of the buffer, an error is thrown. */ | |
9eae7c52 TT |
3303 | |
3304 | static const gdb_byte * | |
3305 | disassemble_dwarf_expression (struct ui_file *stream, | |
3306 | struct gdbarch *arch, unsigned int addr_size, | |
2bda9cc5 | 3307 | int offset_size, const gdb_byte *start, |
9eae7c52 | 3308 | const gdb_byte *data, const gdb_byte *end, |
2bda9cc5 | 3309 | int indent, int all, |
82ca3f51 SM |
3310 | dwarf2_per_cu_data *per_cu, |
3311 | dwarf2_per_objfile *per_objfile) | |
9eae7c52 | 3312 | { |
9eae7c52 TT |
3313 | while (data < end |
3314 | && (all | |
3315 | || (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece))) | |
3316 | { | |
aead7601 | 3317 | enum dwarf_location_atom op = (enum dwarf_location_atom) *data++; |
9fccedf7 DE |
3318 | uint64_t ul; |
3319 | int64_t l; | |
9eae7c52 TT |
3320 | const char *name; |
3321 | ||
f39c6ffd | 3322 | name = get_DW_OP_name (op); |
9eae7c52 TT |
3323 | |
3324 | if (!name) | |
3325 | error (_("Unrecognized DWARF opcode 0x%02x at %ld"), | |
06826322 | 3326 | op, (long) (data - 1 - start)); |
6cb06a8c TT |
3327 | gdb_printf (stream, " %*ld: %s", indent + 4, |
3328 | (long) (data - 1 - start), name); | |
9eae7c52 TT |
3329 | |
3330 | switch (op) | |
3331 | { | |
3332 | case DW_OP_addr: | |
d4a087c7 UW |
3333 | ul = extract_unsigned_integer (data, addr_size, |
3334 | gdbarch_byte_order (arch)); | |
9eae7c52 | 3335 | data += addr_size; |
6cb06a8c | 3336 | gdb_printf (stream, " 0x%s", phex_nz (ul, addr_size)); |
9eae7c52 TT |
3337 | break; |
3338 | ||
3339 | case DW_OP_const1u: | |
3340 | ul = extract_unsigned_integer (data, 1, gdbarch_byte_order (arch)); | |
3341 | data += 1; | |
6cb06a8c | 3342 | gdb_printf (stream, " %s", pulongest (ul)); |
9eae7c52 | 3343 | break; |
fc3ecb3e | 3344 | |
9eae7c52 TT |
3345 | case DW_OP_const1s: |
3346 | l = extract_signed_integer (data, 1, gdbarch_byte_order (arch)); | |
3347 | data += 1; | |
6cb06a8c | 3348 | gdb_printf (stream, " %s", plongest (l)); |
9eae7c52 | 3349 | break; |
fc3ecb3e | 3350 | |
9eae7c52 TT |
3351 | case DW_OP_const2u: |
3352 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3353 | data += 2; | |
6cb06a8c | 3354 | gdb_printf (stream, " %s", pulongest (ul)); |
9eae7c52 | 3355 | break; |
fc3ecb3e | 3356 | |
9eae7c52 TT |
3357 | case DW_OP_const2s: |
3358 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3359 | data += 2; | |
6cb06a8c | 3360 | gdb_printf (stream, " %s", plongest (l)); |
9eae7c52 | 3361 | break; |
fc3ecb3e | 3362 | |
9eae7c52 TT |
3363 | case DW_OP_const4u: |
3364 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3365 | data += 4; | |
6cb06a8c | 3366 | gdb_printf (stream, " %s", pulongest (ul)); |
9eae7c52 | 3367 | break; |
fc3ecb3e | 3368 | |
9eae7c52 TT |
3369 | case DW_OP_const4s: |
3370 | l = extract_signed_integer (data, 4, gdbarch_byte_order (arch)); | |
3371 | data += 4; | |
6cb06a8c | 3372 | gdb_printf (stream, " %s", plongest (l)); |
9eae7c52 | 3373 | break; |
fc3ecb3e | 3374 | |
9eae7c52 TT |
3375 | case DW_OP_const8u: |
3376 | ul = extract_unsigned_integer (data, 8, gdbarch_byte_order (arch)); | |
3377 | data += 8; | |
6cb06a8c | 3378 | gdb_printf (stream, " %s", pulongest (ul)); |
9eae7c52 | 3379 | break; |
fc3ecb3e | 3380 | |
9eae7c52 TT |
3381 | case DW_OP_const8s: |
3382 | l = extract_signed_integer (data, 8, gdbarch_byte_order (arch)); | |
3383 | data += 8; | |
6cb06a8c | 3384 | gdb_printf (stream, " %s", plongest (l)); |
9eae7c52 | 3385 | break; |
fc3ecb3e | 3386 | |
9eae7c52 | 3387 | case DW_OP_constu: |
f664829e | 3388 | data = safe_read_uleb128 (data, end, &ul); |
6cb06a8c | 3389 | gdb_printf (stream, " %s", pulongest (ul)); |
9eae7c52 | 3390 | break; |
fc3ecb3e | 3391 | |
9eae7c52 | 3392 | case DW_OP_consts: |
f664829e | 3393 | data = safe_read_sleb128 (data, end, &l); |
6cb06a8c | 3394 | gdb_printf (stream, " %s", plongest (l)); |
9eae7c52 TT |
3395 | break; |
3396 | ||
3397 | case DW_OP_reg0: | |
3398 | case DW_OP_reg1: | |
3399 | case DW_OP_reg2: | |
3400 | case DW_OP_reg3: | |
3401 | case DW_OP_reg4: | |
3402 | case DW_OP_reg5: | |
3403 | case DW_OP_reg6: | |
3404 | case DW_OP_reg7: | |
3405 | case DW_OP_reg8: | |
3406 | case DW_OP_reg9: | |
3407 | case DW_OP_reg10: | |
3408 | case DW_OP_reg11: | |
3409 | case DW_OP_reg12: | |
3410 | case DW_OP_reg13: | |
3411 | case DW_OP_reg14: | |
3412 | case DW_OP_reg15: | |
3413 | case DW_OP_reg16: | |
3414 | case DW_OP_reg17: | |
3415 | case DW_OP_reg18: | |
3416 | case DW_OP_reg19: | |
3417 | case DW_OP_reg20: | |
3418 | case DW_OP_reg21: | |
3419 | case DW_OP_reg22: | |
3420 | case DW_OP_reg23: | |
3421 | case DW_OP_reg24: | |
3422 | case DW_OP_reg25: | |
3423 | case DW_OP_reg26: | |
3424 | case DW_OP_reg27: | |
3425 | case DW_OP_reg28: | |
3426 | case DW_OP_reg29: | |
3427 | case DW_OP_reg30: | |
3428 | case DW_OP_reg31: | |
6cb06a8c TT |
3429 | gdb_printf (stream, " [$%s]", |
3430 | locexpr_regname (arch, op - DW_OP_reg0)); | |
9eae7c52 TT |
3431 | break; |
3432 | ||
3433 | case DW_OP_regx: | |
f664829e | 3434 | data = safe_read_uleb128 (data, end, &ul); |
6cb06a8c TT |
3435 | gdb_printf (stream, " %s [$%s]", pulongest (ul), |
3436 | locexpr_regname (arch, (int) ul)); | |
9eae7c52 TT |
3437 | break; |
3438 | ||
3439 | case DW_OP_implicit_value: | |
f664829e | 3440 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 | 3441 | data += ul; |
6cb06a8c | 3442 | gdb_printf (stream, " %s", pulongest (ul)); |
9eae7c52 TT |
3443 | break; |
3444 | ||
3445 | case DW_OP_breg0: | |
3446 | case DW_OP_breg1: | |
3447 | case DW_OP_breg2: | |
3448 | case DW_OP_breg3: | |
3449 | case DW_OP_breg4: | |
3450 | case DW_OP_breg5: | |
3451 | case DW_OP_breg6: | |
3452 | case DW_OP_breg7: | |
3453 | case DW_OP_breg8: | |
3454 | case DW_OP_breg9: | |
3455 | case DW_OP_breg10: | |
3456 | case DW_OP_breg11: | |
3457 | case DW_OP_breg12: | |
3458 | case DW_OP_breg13: | |
3459 | case DW_OP_breg14: | |
3460 | case DW_OP_breg15: | |
3461 | case DW_OP_breg16: | |
3462 | case DW_OP_breg17: | |
3463 | case DW_OP_breg18: | |
3464 | case DW_OP_breg19: | |
3465 | case DW_OP_breg20: | |
3466 | case DW_OP_breg21: | |
3467 | case DW_OP_breg22: | |
3468 | case DW_OP_breg23: | |
3469 | case DW_OP_breg24: | |
3470 | case DW_OP_breg25: | |
3471 | case DW_OP_breg26: | |
3472 | case DW_OP_breg27: | |
3473 | case DW_OP_breg28: | |
3474 | case DW_OP_breg29: | |
3475 | case DW_OP_breg30: | |
3476 | case DW_OP_breg31: | |
f664829e | 3477 | data = safe_read_sleb128 (data, end, &l); |
6cb06a8c TT |
3478 | gdb_printf (stream, " %s [$%s]", plongest (l), |
3479 | locexpr_regname (arch, op - DW_OP_breg0)); | |
9eae7c52 TT |
3480 | break; |
3481 | ||
3482 | case DW_OP_bregx: | |
f664829e DE |
3483 | data = safe_read_uleb128 (data, end, &ul); |
3484 | data = safe_read_sleb128 (data, end, &l); | |
6cb06a8c TT |
3485 | gdb_printf (stream, " register %s [$%s] offset %s", |
3486 | pulongest (ul), | |
3487 | locexpr_regname (arch, (int) ul), | |
3488 | plongest (l)); | |
9eae7c52 TT |
3489 | break; |
3490 | ||
3491 | case DW_OP_fbreg: | |
f664829e | 3492 | data = safe_read_sleb128 (data, end, &l); |
6cb06a8c | 3493 | gdb_printf (stream, " %s", plongest (l)); |
9eae7c52 TT |
3494 | break; |
3495 | ||
3496 | case DW_OP_xderef_size: | |
3497 | case DW_OP_deref_size: | |
3498 | case DW_OP_pick: | |
6cb06a8c | 3499 | gdb_printf (stream, " %d", *data); |
9eae7c52 TT |
3500 | ++data; |
3501 | break; | |
3502 | ||
3503 | case DW_OP_plus_uconst: | |
f664829e | 3504 | data = safe_read_uleb128 (data, end, &ul); |
6cb06a8c | 3505 | gdb_printf (stream, " %s", pulongest (ul)); |
9eae7c52 TT |
3506 | break; |
3507 | ||
3508 | case DW_OP_skip: | |
3509 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3510 | data += 2; | |
6cb06a8c TT |
3511 | gdb_printf (stream, " to %ld", |
3512 | (long) (data + l - start)); | |
9eae7c52 TT |
3513 | break; |
3514 | ||
3515 | case DW_OP_bra: | |
3516 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3517 | data += 2; | |
6cb06a8c TT |
3518 | gdb_printf (stream, " %ld", |
3519 | (long) (data + l - start)); | |
9eae7c52 TT |
3520 | break; |
3521 | ||
3522 | case DW_OP_call2: | |
3523 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3524 | data += 2; | |
6cb06a8c | 3525 | gdb_printf (stream, " offset %s", phex_nz (ul, 2)); |
9eae7c52 TT |
3526 | break; |
3527 | ||
3528 | case DW_OP_call4: | |
3529 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3530 | data += 4; | |
6cb06a8c | 3531 | gdb_printf (stream, " offset %s", phex_nz (ul, 4)); |
9eae7c52 TT |
3532 | break; |
3533 | ||
3534 | case DW_OP_call_ref: | |
3535 | ul = extract_unsigned_integer (data, offset_size, | |
3536 | gdbarch_byte_order (arch)); | |
3537 | data += offset_size; | |
6cb06a8c | 3538 | gdb_printf (stream, " offset %s", phex_nz (ul, offset_size)); |
9eae7c52 TT |
3539 | break; |
3540 | ||
dda83cd7 | 3541 | case DW_OP_piece: |
f664829e | 3542 | data = safe_read_uleb128 (data, end, &ul); |
6cb06a8c | 3543 | gdb_printf (stream, " %s (bytes)", pulongest (ul)); |
9eae7c52 TT |
3544 | break; |
3545 | ||
3546 | case DW_OP_bit_piece: | |
3547 | { | |
9fccedf7 | 3548 | uint64_t offset; |
9eae7c52 | 3549 | |
f664829e DE |
3550 | data = safe_read_uleb128 (data, end, &ul); |
3551 | data = safe_read_uleb128 (data, end, &offset); | |
6cb06a8c TT |
3552 | gdb_printf (stream, " size %s offset %s (bits)", |
3553 | pulongest (ul), pulongest (offset)); | |
9eae7c52 TT |
3554 | } |
3555 | break; | |
8cf6f0b1 | 3556 | |
216f72a1 | 3557 | case DW_OP_implicit_pointer: |
8cf6f0b1 TT |
3558 | case DW_OP_GNU_implicit_pointer: |
3559 | { | |
3560 | ul = extract_unsigned_integer (data, offset_size, | |
3561 | gdbarch_byte_order (arch)); | |
3562 | data += offset_size; | |
3563 | ||
f664829e | 3564 | data = safe_read_sleb128 (data, end, &l); |
8cf6f0b1 | 3565 | |
6cb06a8c TT |
3566 | gdb_printf (stream, " DIE %s offset %s", |
3567 | phex_nz (ul, offset_size), | |
3568 | plongest (l)); | |
8cf6f0b1 TT |
3569 | } |
3570 | break; | |
5e44ecb3 | 3571 | |
216f72a1 | 3572 | case DW_OP_deref_type: |
5e44ecb3 TT |
3573 | case DW_OP_GNU_deref_type: |
3574 | { | |
b926417a | 3575 | int deref_addr_size = *data++; |
5e44ecb3 TT |
3576 | struct type *type; |
3577 | ||
f664829e | 3578 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 3579 | cu_offset offset = (cu_offset) ul; |
aa66c379 | 3580 | type = dwarf2_get_die_type (offset, per_cu, per_objfile); |
6cb06a8c | 3581 | gdb_printf (stream, "<"); |
5e44ecb3 | 3582 | type_print (type, "", stream, -1); |
6cb06a8c TT |
3583 | gdb_printf (stream, " [0x%s]> %d", |
3584 | phex_nz (to_underlying (offset), 0), | |
3585 | deref_addr_size); | |
5e44ecb3 TT |
3586 | } |
3587 | break; | |
3588 | ||
216f72a1 | 3589 | case DW_OP_const_type: |
5e44ecb3 TT |
3590 | case DW_OP_GNU_const_type: |
3591 | { | |
5e44ecb3 TT |
3592 | struct type *type; |
3593 | ||
f664829e | 3594 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 3595 | cu_offset type_die = (cu_offset) ul; |
aa66c379 | 3596 | type = dwarf2_get_die_type (type_die, per_cu, per_objfile); |
6cb06a8c | 3597 | gdb_printf (stream, "<"); |
5e44ecb3 | 3598 | type_print (type, "", stream, -1); |
6cb06a8c TT |
3599 | gdb_printf (stream, " [0x%s]>", |
3600 | phex_nz (to_underlying (type_die), 0)); | |
d9e49b61 TT |
3601 | |
3602 | int n = *data++; | |
6cb06a8c | 3603 | gdb_printf (stream, " %d byte block:", n); |
d9e49b61 | 3604 | for (int i = 0; i < n; ++i) |
6cb06a8c | 3605 | gdb_printf (stream, " %02x", data[i]); |
d9e49b61 | 3606 | data += n; |
5e44ecb3 TT |
3607 | } |
3608 | break; | |
3609 | ||
216f72a1 | 3610 | case DW_OP_regval_type: |
5e44ecb3 TT |
3611 | case DW_OP_GNU_regval_type: |
3612 | { | |
9fccedf7 | 3613 | uint64_t reg; |
5e44ecb3 TT |
3614 | struct type *type; |
3615 | ||
f664829e DE |
3616 | data = safe_read_uleb128 (data, end, ®); |
3617 | data = safe_read_uleb128 (data, end, &ul); | |
9c541725 | 3618 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 | 3619 | |
aa66c379 | 3620 | type = dwarf2_get_die_type (type_die, per_cu, per_objfile); |
6cb06a8c | 3621 | gdb_printf (stream, "<"); |
5e44ecb3 | 3622 | type_print (type, "", stream, -1); |
6cb06a8c TT |
3623 | gdb_printf (stream, " [0x%s]> [$%s]", |
3624 | phex_nz (to_underlying (type_die), 0), | |
3625 | locexpr_regname (arch, reg)); | |
5e44ecb3 TT |
3626 | } |
3627 | break; | |
3628 | ||
216f72a1 | 3629 | case DW_OP_convert: |
5e44ecb3 | 3630 | case DW_OP_GNU_convert: |
216f72a1 | 3631 | case DW_OP_reinterpret: |
5e44ecb3 TT |
3632 | case DW_OP_GNU_reinterpret: |
3633 | { | |
f664829e | 3634 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 3635 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 | 3636 | |
9c541725 | 3637 | if (to_underlying (type_die) == 0) |
6cb06a8c | 3638 | gdb_printf (stream, "<0>"); |
5e44ecb3 TT |
3639 | else |
3640 | { | |
3641 | struct type *type; | |
3642 | ||
aa66c379 | 3643 | type = dwarf2_get_die_type (type_die, per_cu, per_objfile); |
6cb06a8c | 3644 | gdb_printf (stream, "<"); |
5e44ecb3 | 3645 | type_print (type, "", stream, -1); |
6cb06a8c TT |
3646 | gdb_printf (stream, " [0x%s]>", |
3647 | phex_nz (to_underlying (type_die), 0)); | |
5e44ecb3 TT |
3648 | } |
3649 | } | |
3650 | break; | |
2bda9cc5 | 3651 | |
216f72a1 | 3652 | case DW_OP_entry_value: |
2bda9cc5 | 3653 | case DW_OP_GNU_entry_value: |
f664829e | 3654 | data = safe_read_uleb128 (data, end, &ul); |
a11ac3b3 | 3655 | gdb_putc ('\n', stream); |
2bda9cc5 JK |
3656 | disassemble_dwarf_expression (stream, arch, addr_size, offset_size, |
3657 | start, data, data + ul, indent + 2, | |
82ca3f51 | 3658 | all, per_cu, per_objfile); |
2bda9cc5 JK |
3659 | data += ul; |
3660 | continue; | |
49f6c839 | 3661 | |
a24f71ab JK |
3662 | case DW_OP_GNU_parameter_ref: |
3663 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3664 | data += 4; | |
6cb06a8c | 3665 | gdb_printf (stream, " offset %s", phex_nz (ul, 4)); |
a24f71ab JK |
3666 | break; |
3667 | ||
336d760d | 3668 | case DW_OP_addrx: |
49f6c839 DE |
3669 | case DW_OP_GNU_addr_index: |
3670 | data = safe_read_uleb128 (data, end, &ul); | |
82ca3f51 | 3671 | ul = dwarf2_read_addr_index (per_cu, per_objfile, ul); |
6cb06a8c | 3672 | gdb_printf (stream, " 0x%s", phex_nz (ul, addr_size)); |
49f6c839 | 3673 | break; |
fc3ecb3e | 3674 | |
49f6c839 DE |
3675 | case DW_OP_GNU_const_index: |
3676 | data = safe_read_uleb128 (data, end, &ul); | |
82ca3f51 | 3677 | ul = dwarf2_read_addr_index (per_cu, per_objfile, ul); |
6cb06a8c | 3678 | gdb_printf (stream, " %s", pulongest (ul)); |
49f6c839 | 3679 | break; |
a6b786da KB |
3680 | |
3681 | case DW_OP_GNU_variable_value: | |
3682 | ul = extract_unsigned_integer (data, offset_size, | |
3683 | gdbarch_byte_order (arch)); | |
3684 | data += offset_size; | |
6cb06a8c | 3685 | gdb_printf (stream, " offset %s", phex_nz (ul, offset_size)); |
a6b786da | 3686 | break; |
9eae7c52 TT |
3687 | } |
3688 | ||
6cb06a8c | 3689 | gdb_printf (stream, "\n"); |
9eae7c52 | 3690 | } |
c3228f12 | 3691 | |
08922a10 | 3692 | return data; |
4c2df51b DJ |
3693 | } |
3694 | ||
009b64fc TT |
3695 | static bool dwarf_always_disassemble; |
3696 | ||
3697 | static void | |
3698 | show_dwarf_always_disassemble (struct ui_file *file, int from_tty, | |
3699 | struct cmd_list_element *c, const char *value) | |
3700 | { | |
6cb06a8c TT |
3701 | gdb_printf (file, |
3702 | _("Whether to always disassemble " | |
3703 | "DWARF expressions is %s.\n"), | |
3704 | value); | |
009b64fc TT |
3705 | } |
3706 | ||
08922a10 SS |
3707 | /* Describe a single location, which may in turn consist of multiple |
3708 | pieces. */ | |
a55cc764 | 3709 | |
08922a10 SS |
3710 | static void |
3711 | locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr, | |
0d45f56e | 3712 | struct ui_file *stream, |
56eb65bd | 3713 | const gdb_byte *data, size_t size, |
82ca3f51 SM |
3714 | unsigned int addr_size, |
3715 | int offset_size, dwarf2_per_cu_data *per_cu, | |
3716 | dwarf2_per_objfile *per_objfile) | |
08922a10 | 3717 | { |
0d45f56e | 3718 | const gdb_byte *end = data + size; |
9eae7c52 | 3719 | int first_piece = 1, bad = 0; |
82ca3f51 | 3720 | objfile *objfile = per_objfile->objfile; |
08922a10 | 3721 | |
08922a10 SS |
3722 | while (data < end) |
3723 | { | |
9eae7c52 TT |
3724 | const gdb_byte *here = data; |
3725 | int disassemble = 1; | |
3726 | ||
3727 | if (first_piece) | |
3728 | first_piece = 0; | |
3729 | else | |
6cb06a8c | 3730 | gdb_printf (stream, _(", and ")); |
08922a10 | 3731 | |
b4f54984 | 3732 | if (!dwarf_always_disassemble) |
9eae7c52 | 3733 | { |
3e43a32a | 3734 | data = locexpr_describe_location_piece (symbol, stream, |
82ca3f51 | 3735 | addr, per_cu, per_objfile, |
9eae7c52 TT |
3736 | data, end, addr_size); |
3737 | /* If we printed anything, or if we have an empty piece, | |
3738 | then don't disassemble. */ | |
3739 | if (data != here | |
3740 | || data[0] == DW_OP_piece | |
3741 | || data[0] == DW_OP_bit_piece) | |
3742 | disassemble = 0; | |
08922a10 | 3743 | } |
9eae7c52 | 3744 | if (disassemble) |
2bda9cc5 | 3745 | { |
6cb06a8c | 3746 | gdb_printf (stream, _("a complex DWARF expression:\n")); |
2bda9cc5 | 3747 | data = disassemble_dwarf_expression (stream, |
08feed99 | 3748 | objfile->arch (), |
2bda9cc5 JK |
3749 | addr_size, offset_size, data, |
3750 | data, end, 0, | |
b4f54984 | 3751 | dwarf_always_disassemble, |
82ca3f51 | 3752 | per_cu, per_objfile); |
2bda9cc5 | 3753 | } |
9eae7c52 TT |
3754 | |
3755 | if (data < end) | |
08922a10 | 3756 | { |
9eae7c52 | 3757 | int empty = data == here; |
08922a10 | 3758 | |
9eae7c52 | 3759 | if (disassemble) |
6cb06a8c | 3760 | gdb_printf (stream, " "); |
9eae7c52 TT |
3761 | if (data[0] == DW_OP_piece) |
3762 | { | |
9fccedf7 | 3763 | uint64_t bytes; |
08922a10 | 3764 | |
f664829e | 3765 | data = safe_read_uleb128 (data + 1, end, &bytes); |
08922a10 | 3766 | |
9eae7c52 | 3767 | if (empty) |
6cb06a8c TT |
3768 | gdb_printf (stream, _("an empty %s-byte piece"), |
3769 | pulongest (bytes)); | |
9eae7c52 | 3770 | else |
6cb06a8c TT |
3771 | gdb_printf (stream, _(" [%s-byte piece]"), |
3772 | pulongest (bytes)); | |
9eae7c52 TT |
3773 | } |
3774 | else if (data[0] == DW_OP_bit_piece) | |
3775 | { | |
9fccedf7 | 3776 | uint64_t bits, offset; |
9eae7c52 | 3777 | |
f664829e DE |
3778 | data = safe_read_uleb128 (data + 1, end, &bits); |
3779 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
3780 | |
3781 | if (empty) | |
6cb06a8c TT |
3782 | gdb_printf (stream, |
3783 | _("an empty %s-bit piece"), | |
3784 | pulongest (bits)); | |
9eae7c52 | 3785 | else |
6cb06a8c TT |
3786 | gdb_printf (stream, |
3787 | _(" [%s-bit piece, offset %s bits]"), | |
3788 | pulongest (bits), pulongest (offset)); | |
9eae7c52 TT |
3789 | } |
3790 | else | |
3791 | { | |
3792 | bad = 1; | |
3793 | break; | |
3794 | } | |
08922a10 SS |
3795 | } |
3796 | } | |
3797 | ||
3798 | if (bad || data > end) | |
3799 | error (_("Corrupted DWARF2 expression for \"%s\"."), | |
987012b8 | 3800 | symbol->print_name ()); |
08922a10 SS |
3801 | } |
3802 | ||
3803 | /* Print a natural-language description of SYMBOL to STREAM. This | |
3804 | version is for a symbol with a single location. */ | |
a55cc764 | 3805 | |
08922a10 SS |
3806 | static void |
3807 | locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
3808 | struct ui_file *stream) | |
3809 | { | |
9a3c8263 SM |
3810 | struct dwarf2_locexpr_baton *dlbaton |
3811 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
09ba997f TT |
3812 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
3813 | int offset_size = dlbaton->per_cu->offset_size (); | |
08922a10 | 3814 | |
3e43a32a MS |
3815 | locexpr_describe_location_1 (symbol, addr, stream, |
3816 | dlbaton->data, dlbaton->size, | |
82ca3f51 SM |
3817 | addr_size, offset_size, |
3818 | dlbaton->per_cu, dlbaton->per_objfile); | |
08922a10 SS |
3819 | } |
3820 | ||
3821 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
3822 | any necessary bytecode in AX. */ | |
a55cc764 | 3823 | |
0d53c4c4 | 3824 | static void |
40f4af28 SM |
3825 | locexpr_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax, |
3826 | struct axs_value *value) | |
a55cc764 | 3827 | { |
9a3c8263 SM |
3828 | struct dwarf2_locexpr_baton *dlbaton |
3829 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
09ba997f | 3830 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
a55cc764 | 3831 | |
1d6edc3c | 3832 | if (dlbaton->size == 0) |
cabe9ab6 PA |
3833 | value->optimized_out = 1; |
3834 | else | |
40f4af28 | 3835 | dwarf2_compile_expr_to_ax (ax, value, addr_size, dlbaton->data, |
4b167ea1 SM |
3836 | dlbaton->data + dlbaton->size, dlbaton->per_cu, |
3837 | dlbaton->per_objfile); | |
a55cc764 DJ |
3838 | } |
3839 | ||
bb2ec1b3 TT |
3840 | /* symbol_computed_ops 'generate_c_location' method. */ |
3841 | ||
3842 | static void | |
d82b3862 | 3843 | locexpr_generate_c_location (struct symbol *sym, string_file *stream, |
bb2ec1b3 | 3844 | struct gdbarch *gdbarch, |
3637a558 | 3845 | std::vector<bool> ®isters_used, |
bb2ec1b3 TT |
3846 | CORE_ADDR pc, const char *result_name) |
3847 | { | |
9a3c8263 SM |
3848 | struct dwarf2_locexpr_baton *dlbaton |
3849 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (sym); | |
09ba997f | 3850 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
bb2ec1b3 TT |
3851 | |
3852 | if (dlbaton->size == 0) | |
987012b8 | 3853 | error (_("symbol \"%s\" is optimized out"), sym->natural_name ()); |
bb2ec1b3 TT |
3854 | |
3855 | compile_dwarf_expr_to_c (stream, result_name, | |
3856 | sym, pc, gdbarch, registers_used, addr_size, | |
3857 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4b167ea1 | 3858 | dlbaton->per_cu, dlbaton->per_objfile); |
bb2ec1b3 TT |
3859 | } |
3860 | ||
4c2df51b DJ |
3861 | /* The set of location functions used with the DWARF-2 expression |
3862 | evaluator. */ | |
768a979c | 3863 | const struct symbol_computed_ops dwarf2_locexpr_funcs = { |
4c2df51b | 3864 | locexpr_read_variable, |
e18b2753 | 3865 | locexpr_read_variable_at_entry, |
0b31a4bc | 3866 | locexpr_get_symbol_read_needs, |
4c2df51b | 3867 | locexpr_describe_location, |
f1e6e072 | 3868 | 0, /* location_has_loclist */ |
bb2ec1b3 TT |
3869 | locexpr_tracepoint_var_ref, |
3870 | locexpr_generate_c_location | |
4c2df51b | 3871 | }; |
0d53c4c4 DJ |
3872 | |
3873 | ||
3874 | /* Wrapper functions for location lists. These generally find | |
3875 | the appropriate location expression and call something above. */ | |
3876 | ||
3877 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
3878 | evaluator to calculate the location. */ | |
3879 | static struct value * | |
3880 | loclist_read_variable (struct symbol *symbol, struct frame_info *frame) | |
3881 | { | |
9a3c8263 SM |
3882 | struct dwarf2_loclist_baton *dlbaton |
3883 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
0d53c4c4 | 3884 | struct value *val; |
947bb88f | 3885 | const gdb_byte *data; |
b6b08ebf | 3886 | size_t size; |
8cf6f0b1 | 3887 | CORE_ADDR pc = frame ? get_frame_address_in_block (frame) : 0; |
0d53c4c4 | 3888 | |
8cf6f0b1 | 3889 | data = dwarf2_find_location_expression (dlbaton, &size, pc); |
5f9c5a63 | 3890 | val = dwarf2_evaluate_loc_desc (symbol->type (), frame, data, size, |
9f47c707 | 3891 | dlbaton->per_cu, dlbaton->per_objfile); |
0d53c4c4 DJ |
3892 | |
3893 | return val; | |
3894 | } | |
3895 | ||
e18b2753 JK |
3896 | /* Read variable SYMBOL like loclist_read_variable at (callee) FRAME's function |
3897 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
3898 | will be thrown. | |
3899 | ||
3900 | Function always returns non-NULL value, it may be marked optimized out if | |
3901 | inferior frame information is not available. It throws NO_ENTRY_VALUE_ERROR | |
3902 | if it cannot resolve the parameter for any reason. */ | |
3903 | ||
3904 | static struct value * | |
3905 | loclist_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
3906 | { | |
9a3c8263 SM |
3907 | struct dwarf2_loclist_baton *dlbaton |
3908 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
3909 | const gdb_byte *data; |
3910 | size_t size; | |
3911 | CORE_ADDR pc; | |
3912 | ||
3913 | if (frame == NULL || !get_frame_func_if_available (frame, &pc)) | |
5f9c5a63 | 3914 | return allocate_optimized_out_value (symbol->type ()); |
e18b2753 JK |
3915 | |
3916 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
3917 | if (data == NULL) | |
5f9c5a63 | 3918 | return allocate_optimized_out_value (symbol->type ()); |
e18b2753 | 3919 | |
5f9c5a63 | 3920 | return value_of_dwarf_block_entry (symbol->type (), frame, data, size); |
e18b2753 JK |
3921 | } |
3922 | ||
0b31a4bc TT |
3923 | /* Implementation of get_symbol_read_needs from |
3924 | symbol_computed_ops. */ | |
3925 | ||
3926 | static enum symbol_needs_kind | |
3927 | loclist_symbol_needs (struct symbol *symbol) | |
0d53c4c4 DJ |
3928 | { |
3929 | /* If there's a location list, then assume we need to have a frame | |
3930 | to choose the appropriate location expression. With tracking of | |
3931 | global variables this is not necessarily true, but such tracking | |
3932 | is disabled in GCC at the moment until we figure out how to | |
3933 | represent it. */ | |
3934 | ||
0b31a4bc | 3935 | return SYMBOL_NEEDS_FRAME; |
0d53c4c4 DJ |
3936 | } |
3937 | ||
08922a10 SS |
3938 | /* Print a natural-language description of SYMBOL to STREAM. This |
3939 | version applies when there is a list of different locations, each | |
3940 | with a specified address range. */ | |
3941 | ||
3942 | static void | |
3943 | loclist_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
3944 | struct ui_file *stream) | |
0d53c4c4 | 3945 | { |
9a3c8263 SM |
3946 | struct dwarf2_loclist_baton *dlbaton |
3947 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 3948 | const gdb_byte *loc_ptr, *buf_end; |
a50264ba TT |
3949 | dwarf2_per_objfile *per_objfile = dlbaton->per_objfile; |
3950 | struct objfile *objfile = per_objfile->objfile; | |
08feed99 | 3951 | struct gdbarch *gdbarch = objfile->arch (); |
08922a10 | 3952 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
09ba997f TT |
3953 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
3954 | int offset_size = dlbaton->per_cu->offset_size (); | |
98badbfd | 3955 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd.get ()); |
0c7af292 TT |
3956 | /* Adjustment for relocatable objects. */ |
3957 | CORE_ADDR text_offset = objfile->text_section_offset (); | |
3958 | CORE_ADDR base_address = dlbaton->base_address; | |
f664829e | 3959 | int done = 0; |
08922a10 SS |
3960 | |
3961 | loc_ptr = dlbaton->data; | |
3962 | buf_end = dlbaton->data + dlbaton->size; | |
3963 | ||
6cb06a8c | 3964 | gdb_printf (stream, _("multi-location:\n")); |
08922a10 SS |
3965 | |
3966 | /* Iterate through locations until we run out. */ | |
f664829e | 3967 | while (!done) |
08922a10 | 3968 | { |
f664829e DE |
3969 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
3970 | int length; | |
3971 | enum debug_loc_kind kind; | |
3972 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
3973 | ||
85a9510c | 3974 | if (dlbaton->per_cu->version () < 5 && dlbaton->from_dwo) |
f664829e | 3975 | kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu, |
82ca3f51 | 3976 | dlbaton->per_objfile, |
f664829e | 3977 | loc_ptr, buf_end, &new_ptr, |
3771a44c | 3978 | &low, &high, byte_order); |
85a9510c | 3979 | else if (dlbaton->per_cu->version () < 5) |
f664829e DE |
3980 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
3981 | &low, &high, | |
3982 | byte_order, addr_size, | |
3983 | signed_addr_p); | |
85a9510c | 3984 | else |
3985 | kind = decode_debug_loclists_addresses (dlbaton->per_cu, | |
82ca3f51 | 3986 | dlbaton->per_objfile, |
85a9510c | 3987 | loc_ptr, buf_end, &new_ptr, |
3988 | &low, &high, byte_order, | |
3989 | addr_size, signed_addr_p); | |
f664829e DE |
3990 | loc_ptr = new_ptr; |
3991 | switch (kind) | |
08922a10 | 3992 | { |
f664829e DE |
3993 | case DEBUG_LOC_END_OF_LIST: |
3994 | done = 1; | |
3995 | continue; | |
fc3ecb3e | 3996 | |
f664829e | 3997 | case DEBUG_LOC_BASE_ADDRESS: |
0c7af292 | 3998 | base_address = high; |
6cb06a8c TT |
3999 | gdb_printf (stream, _(" Base address %s"), |
4000 | paddress (gdbarch, base_address)); | |
08922a10 | 4001 | continue; |
fc3ecb3e | 4002 | |
3771a44c DE |
4003 | case DEBUG_LOC_START_END: |
4004 | case DEBUG_LOC_START_LENGTH: | |
85a9510c | 4005 | case DEBUG_LOC_OFFSET_PAIR: |
f664829e | 4006 | break; |
fc3ecb3e | 4007 | |
f664829e DE |
4008 | case DEBUG_LOC_BUFFER_OVERFLOW: |
4009 | case DEBUG_LOC_INVALID_ENTRY: | |
4010 | error (_("Corrupted DWARF expression for symbol \"%s\"."), | |
987012b8 | 4011 | symbol->print_name ()); |
fc3ecb3e | 4012 | |
f664829e DE |
4013 | default: |
4014 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
08922a10 SS |
4015 | } |
4016 | ||
08922a10 | 4017 | /* Otherwise, a location expression entry. */ |
0c7af292 TT |
4018 | low += text_offset; |
4019 | high += text_offset; | |
4020 | if (!dlbaton->from_dwo && kind == DEBUG_LOC_OFFSET_PAIR) | |
7b9f73fa TT |
4021 | { |
4022 | low += base_address; | |
4023 | high += base_address; | |
4024 | } | |
08922a10 | 4025 | |
3e29f34a MR |
4026 | low = gdbarch_adjust_dwarf2_addr (gdbarch, low); |
4027 | high = gdbarch_adjust_dwarf2_addr (gdbarch, high); | |
4028 | ||
85a9510c | 4029 | if (dlbaton->per_cu->version () < 5) |
4030 | { | |
4031 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); | |
4032 | loc_ptr += 2; | |
4033 | } | |
4034 | else | |
4035 | { | |
4036 | unsigned int bytes_read; | |
4037 | length = read_unsigned_leb128 (NULL, loc_ptr, &bytes_read); | |
4038 | loc_ptr += bytes_read; | |
4039 | } | |
08922a10 | 4040 | |
08922a10 SS |
4041 | /* (It would improve readability to print only the minimum |
4042 | necessary digits of the second number of the range.) */ | |
6cb06a8c TT |
4043 | gdb_printf (stream, _(" Range %s-%s: "), |
4044 | paddress (gdbarch, low), paddress (gdbarch, high)); | |
08922a10 SS |
4045 | |
4046 | /* Now describe this particular location. */ | |
4047 | locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length, | |
82ca3f51 SM |
4048 | addr_size, offset_size, |
4049 | dlbaton->per_cu, dlbaton->per_objfile); | |
9eae7c52 | 4050 | |
6cb06a8c | 4051 | gdb_printf (stream, "\n"); |
08922a10 SS |
4052 | |
4053 | loc_ptr += length; | |
4054 | } | |
0d53c4c4 DJ |
4055 | } |
4056 | ||
4057 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4058 | any necessary bytecode in AX. */ | |
4059 | static void | |
40f4af28 SM |
4060 | loclist_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax, |
4061 | struct axs_value *value) | |
0d53c4c4 | 4062 | { |
9a3c8263 SM |
4063 | struct dwarf2_loclist_baton *dlbaton |
4064 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4065 | const gdb_byte *data; |
b6b08ebf | 4066 | size_t size; |
09ba997f | 4067 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
0d53c4c4 | 4068 | |
8cf6f0b1 | 4069 | data = dwarf2_find_location_expression (dlbaton, &size, ax->scope); |
1d6edc3c | 4070 | if (size == 0) |
cabe9ab6 PA |
4071 | value->optimized_out = 1; |
4072 | else | |
40f4af28 | 4073 | dwarf2_compile_expr_to_ax (ax, value, addr_size, data, data + size, |
4b167ea1 | 4074 | dlbaton->per_cu, dlbaton->per_objfile); |
0d53c4c4 DJ |
4075 | } |
4076 | ||
bb2ec1b3 TT |
4077 | /* symbol_computed_ops 'generate_c_location' method. */ |
4078 | ||
4079 | static void | |
d82b3862 | 4080 | loclist_generate_c_location (struct symbol *sym, string_file *stream, |
bb2ec1b3 | 4081 | struct gdbarch *gdbarch, |
3637a558 | 4082 | std::vector<bool> ®isters_used, |
bb2ec1b3 TT |
4083 | CORE_ADDR pc, const char *result_name) |
4084 | { | |
9a3c8263 SM |
4085 | struct dwarf2_loclist_baton *dlbaton |
4086 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (sym); | |
09ba997f | 4087 | unsigned int addr_size = dlbaton->per_cu->addr_size (); |
bb2ec1b3 TT |
4088 | const gdb_byte *data; |
4089 | size_t size; | |
4090 | ||
4091 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4092 | if (size == 0) | |
987012b8 | 4093 | error (_("symbol \"%s\" is optimized out"), sym->natural_name ()); |
bb2ec1b3 TT |
4094 | |
4095 | compile_dwarf_expr_to_c (stream, result_name, | |
4096 | sym, pc, gdbarch, registers_used, addr_size, | |
4097 | data, data + size, | |
4b167ea1 SM |
4098 | dlbaton->per_cu, |
4099 | dlbaton->per_objfile); | |
bb2ec1b3 TT |
4100 | } |
4101 | ||
0d53c4c4 DJ |
4102 | /* The set of location functions used with the DWARF-2 expression |
4103 | evaluator and location lists. */ | |
768a979c | 4104 | const struct symbol_computed_ops dwarf2_loclist_funcs = { |
0d53c4c4 | 4105 | loclist_read_variable, |
e18b2753 | 4106 | loclist_read_variable_at_entry, |
0b31a4bc | 4107 | loclist_symbol_needs, |
0d53c4c4 | 4108 | loclist_describe_location, |
f1e6e072 | 4109 | 1, /* location_has_loclist */ |
bb2ec1b3 TT |
4110 | loclist_tracepoint_var_ref, |
4111 | loclist_generate_c_location | |
0d53c4c4 | 4112 | }; |
8e3b41a9 | 4113 | |
6c265988 | 4114 | void _initialize_dwarf2loc (); |
8e3b41a9 | 4115 | void |
6c265988 | 4116 | _initialize_dwarf2loc () |
8e3b41a9 | 4117 | { |
ccce17b0 YQ |
4118 | add_setshow_zuinteger_cmd ("entry-values", class_maintenance, |
4119 | &entry_values_debug, | |
4120 | _("Set entry values and tail call frames " | |
4121 | "debugging."), | |
4122 | _("Show entry values and tail call frames " | |
4123 | "debugging."), | |
4124 | _("When non-zero, the process of determining " | |
4125 | "parameter values from function entry point " | |
4126 | "and tail call frames will be printed."), | |
4127 | NULL, | |
4128 | show_entry_values_debug, | |
4129 | &setdebuglist, &showdebuglist); | |
009b64fc TT |
4130 | |
4131 | add_setshow_boolean_cmd ("always-disassemble", class_obscure, | |
4132 | &dwarf_always_disassemble, _("\ | |
4133 | Set whether `info address' always disassembles DWARF expressions."), _("\ | |
4134 | Show whether `info address' always disassembles DWARF expressions."), _("\ | |
4135 | When enabled, DWARF expressions are always printed in an assembly-like\n\ | |
4136 | syntax. When disabled, expressions will be printed in a more\n\ | |
4137 | conversational style, when possible."), | |
4138 | NULL, | |
4139 | show_dwarf_always_disassemble, | |
4140 | &set_dwarf_cmdlist, | |
4141 | &show_dwarf_cmdlist); | |
8e3b41a9 | 4142 | } |