Commit | Line | Data |
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4c2df51b | 1 | /* DWARF 2 location expression support for GDB. |
feb13ab0 | 2 | |
e2882c85 | 3 | Copyright (C) 2003-2018 Free Software Foundation, Inc. |
feb13ab0 | 4 | |
4c2df51b DJ |
5 | Contributed by Daniel Jacobowitz, MontaVista Software, Inc. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 JB |
11 | the Free Software Foundation; either version 3 of the License, or |
12 | (at your option) any later version. | |
4c2df51b | 13 | |
a9762ec7 JB |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
4c2df51b DJ |
18 | |
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
4c2df51b DJ |
21 | |
22 | #include "defs.h" | |
23 | #include "ui-out.h" | |
24 | #include "value.h" | |
25 | #include "frame.h" | |
26 | #include "gdbcore.h" | |
27 | #include "target.h" | |
28 | #include "inferior.h" | |
a55cc764 DJ |
29 | #include "ax.h" |
30 | #include "ax-gdb.h" | |
e4adbba9 | 31 | #include "regcache.h" |
c3228f12 | 32 | #include "objfiles.h" |
edb3359d | 33 | #include "block.h" |
8e3b41a9 | 34 | #include "gdbcmd.h" |
0fde2c53 | 35 | #include "complaints.h" |
fa8f86ff | 36 | #include "dwarf2.h" |
4c2df51b DJ |
37 | #include "dwarf2expr.h" |
38 | #include "dwarf2loc.h" | |
e7802207 | 39 | #include "dwarf2-frame.h" |
bb2ec1b3 | 40 | #include "compile/compile.h" |
ad06383f | 41 | #include "selftest.h" |
325fac50 | 42 | #include <algorithm> |
58414334 | 43 | #include <vector> |
fc4007c9 | 44 | #include <unordered_set> |
9c541725 | 45 | #include "common/underlying.h" |
d5722aa2 | 46 | #include "common/byte-vector.h" |
4c2df51b | 47 | |
b4f54984 | 48 | extern int dwarf_always_disassemble; |
9eae7c52 | 49 | |
1632a688 JK |
50 | static struct value *dwarf2_evaluate_loc_desc_full (struct type *type, |
51 | struct frame_info *frame, | |
52 | const gdb_byte *data, | |
56eb65bd SP |
53 | size_t size, |
54 | struct dwarf2_per_cu_data *per_cu, | |
7942e96e AA |
55 | struct type *subobj_type, |
56 | LONGEST subobj_byte_offset); | |
8cf6f0b1 | 57 | |
192ca6d8 TT |
58 | static struct call_site_parameter *dwarf_expr_reg_to_entry_parameter |
59 | (struct frame_info *frame, | |
60 | enum call_site_parameter_kind kind, | |
61 | union call_site_parameter_u kind_u, | |
62 | struct dwarf2_per_cu_data **per_cu_return); | |
63 | ||
f664829e DE |
64 | /* Until these have formal names, we define these here. |
65 | ref: http://gcc.gnu.org/wiki/DebugFission | |
66 | Each entry in .debug_loc.dwo begins with a byte that describes the entry, | |
67 | and is then followed by data specific to that entry. */ | |
68 | ||
69 | enum debug_loc_kind | |
70 | { | |
71 | /* Indicates the end of the list of entries. */ | |
72 | DEBUG_LOC_END_OF_LIST = 0, | |
73 | ||
74 | /* This is followed by an unsigned LEB128 number that is an index into | |
75 | .debug_addr and specifies the base address for all following entries. */ | |
76 | DEBUG_LOC_BASE_ADDRESS = 1, | |
77 | ||
78 | /* This is followed by two unsigned LEB128 numbers that are indices into | |
79 | .debug_addr and specify the beginning and ending addresses, and then | |
80 | a normal location expression as in .debug_loc. */ | |
3771a44c DE |
81 | DEBUG_LOC_START_END = 2, |
82 | ||
83 | /* This is followed by an unsigned LEB128 number that is an index into | |
84 | .debug_addr and specifies the beginning address, and a 4 byte unsigned | |
85 | number that specifies the length, and then a normal location expression | |
86 | as in .debug_loc. */ | |
87 | DEBUG_LOC_START_LENGTH = 3, | |
f664829e DE |
88 | |
89 | /* An internal value indicating there is insufficient data. */ | |
90 | DEBUG_LOC_BUFFER_OVERFLOW = -1, | |
91 | ||
92 | /* An internal value indicating an invalid kind of entry was found. */ | |
93 | DEBUG_LOC_INVALID_ENTRY = -2 | |
94 | }; | |
95 | ||
b6807d98 TT |
96 | /* Helper function which throws an error if a synthetic pointer is |
97 | invalid. */ | |
98 | ||
99 | static void | |
100 | invalid_synthetic_pointer (void) | |
101 | { | |
102 | error (_("access outside bounds of object " | |
103 | "referenced via synthetic pointer")); | |
104 | } | |
105 | ||
f664829e DE |
106 | /* Decode the addresses in a non-dwo .debug_loc entry. |
107 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
108 | The encoded low,high addresses are return in *LOW,*HIGH. | |
109 | The result indicates the kind of entry found. */ | |
110 | ||
111 | static enum debug_loc_kind | |
112 | decode_debug_loc_addresses (const gdb_byte *loc_ptr, const gdb_byte *buf_end, | |
113 | const gdb_byte **new_ptr, | |
114 | CORE_ADDR *low, CORE_ADDR *high, | |
115 | enum bfd_endian byte_order, | |
116 | unsigned int addr_size, | |
117 | int signed_addr_p) | |
118 | { | |
119 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); | |
120 | ||
121 | if (buf_end - loc_ptr < 2 * addr_size) | |
122 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
123 | ||
124 | if (signed_addr_p) | |
125 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
126 | else | |
127 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
128 | loc_ptr += addr_size; | |
129 | ||
130 | if (signed_addr_p) | |
131 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
132 | else | |
133 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
134 | loc_ptr += addr_size; | |
135 | ||
136 | *new_ptr = loc_ptr; | |
137 | ||
138 | /* A base-address-selection entry. */ | |
139 | if ((*low & base_mask) == base_mask) | |
140 | return DEBUG_LOC_BASE_ADDRESS; | |
141 | ||
142 | /* An end-of-list entry. */ | |
143 | if (*low == 0 && *high == 0) | |
144 | return DEBUG_LOC_END_OF_LIST; | |
145 | ||
3771a44c | 146 | return DEBUG_LOC_START_END; |
f664829e DE |
147 | } |
148 | ||
43988095 JK |
149 | /* Decode the addresses in .debug_loclists entry. |
150 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
151 | The encoded low,high addresses are return in *LOW,*HIGH. | |
152 | The result indicates the kind of entry found. */ | |
153 | ||
154 | static enum debug_loc_kind | |
155 | decode_debug_loclists_addresses (struct dwarf2_per_cu_data *per_cu, | |
156 | const gdb_byte *loc_ptr, | |
157 | const gdb_byte *buf_end, | |
158 | const gdb_byte **new_ptr, | |
159 | CORE_ADDR *low, CORE_ADDR *high, | |
160 | enum bfd_endian byte_order, | |
161 | unsigned int addr_size, | |
162 | int signed_addr_p) | |
163 | { | |
164 | uint64_t u64; | |
165 | ||
166 | if (loc_ptr == buf_end) | |
167 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
168 | ||
169 | switch (*loc_ptr++) | |
170 | { | |
171 | case DW_LLE_end_of_list: | |
172 | *new_ptr = loc_ptr; | |
173 | return DEBUG_LOC_END_OF_LIST; | |
174 | case DW_LLE_base_address: | |
175 | if (loc_ptr + addr_size > buf_end) | |
176 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
177 | if (signed_addr_p) | |
178 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
179 | else | |
180 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
181 | loc_ptr += addr_size; | |
182 | *new_ptr = loc_ptr; | |
183 | return DEBUG_LOC_BASE_ADDRESS; | |
184 | case DW_LLE_offset_pair: | |
185 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
186 | if (loc_ptr == NULL) | |
187 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
188 | *low = u64; | |
189 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
190 | if (loc_ptr == NULL) | |
191 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
192 | *high = u64; | |
193 | *new_ptr = loc_ptr; | |
194 | return DEBUG_LOC_START_END; | |
195 | default: | |
196 | return DEBUG_LOC_INVALID_ENTRY; | |
197 | } | |
198 | } | |
199 | ||
f664829e DE |
200 | /* Decode the addresses in .debug_loc.dwo entry. |
201 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
202 | The encoded low,high addresses are return in *LOW,*HIGH. | |
203 | The result indicates the kind of entry found. */ | |
204 | ||
205 | static enum debug_loc_kind | |
206 | decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu, | |
207 | const gdb_byte *loc_ptr, | |
208 | const gdb_byte *buf_end, | |
209 | const gdb_byte **new_ptr, | |
3771a44c DE |
210 | CORE_ADDR *low, CORE_ADDR *high, |
211 | enum bfd_endian byte_order) | |
f664829e | 212 | { |
9fccedf7 | 213 | uint64_t low_index, high_index; |
f664829e DE |
214 | |
215 | if (loc_ptr == buf_end) | |
216 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
217 | ||
218 | switch (*loc_ptr++) | |
219 | { | |
43988095 | 220 | case DW_LLE_GNU_end_of_list_entry: |
f664829e DE |
221 | *new_ptr = loc_ptr; |
222 | return DEBUG_LOC_END_OF_LIST; | |
43988095 | 223 | case DW_LLE_GNU_base_address_selection_entry: |
f664829e DE |
224 | *low = 0; |
225 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
226 | if (loc_ptr == NULL) | |
227 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
228 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
229 | *new_ptr = loc_ptr; | |
230 | return DEBUG_LOC_BASE_ADDRESS; | |
43988095 | 231 | case DW_LLE_GNU_start_end_entry: |
f664829e DE |
232 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
233 | if (loc_ptr == NULL) | |
234 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
235 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
236 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
237 | if (loc_ptr == NULL) | |
238 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
239 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
240 | *new_ptr = loc_ptr; | |
3771a44c | 241 | return DEBUG_LOC_START_END; |
43988095 | 242 | case DW_LLE_GNU_start_length_entry: |
3771a44c DE |
243 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
244 | if (loc_ptr == NULL) | |
245 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
246 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
247 | if (loc_ptr + 4 > buf_end) | |
248 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
249 | *high = *low; | |
250 | *high += extract_unsigned_integer (loc_ptr, 4, byte_order); | |
251 | *new_ptr = loc_ptr + 4; | |
252 | return DEBUG_LOC_START_LENGTH; | |
f664829e DE |
253 | default: |
254 | return DEBUG_LOC_INVALID_ENTRY; | |
255 | } | |
256 | } | |
257 | ||
8cf6f0b1 | 258 | /* A function for dealing with location lists. Given a |
0d53c4c4 DJ |
259 | symbol baton (BATON) and a pc value (PC), find the appropriate |
260 | location expression, set *LOCEXPR_LENGTH, and return a pointer | |
261 | to the beginning of the expression. Returns NULL on failure. | |
262 | ||
263 | For now, only return the first matching location expression; there | |
264 | can be more than one in the list. */ | |
265 | ||
8cf6f0b1 TT |
266 | const gdb_byte * |
267 | dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton, | |
268 | size_t *locexpr_length, CORE_ADDR pc) | |
0d53c4c4 | 269 | { |
ae0d2f24 | 270 | struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu); |
f7fd4728 | 271 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
e17a4113 | 272 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
ae0d2f24 | 273 | unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu); |
d4a087c7 | 274 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
8edfa926 | 275 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 276 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (baton->per_cu); |
8edfa926 | 277 | CORE_ADDR base_address = baton->base_address + base_offset; |
f664829e | 278 | const gdb_byte *loc_ptr, *buf_end; |
0d53c4c4 DJ |
279 | |
280 | loc_ptr = baton->data; | |
281 | buf_end = baton->data + baton->size; | |
282 | ||
283 | while (1) | |
284 | { | |
f664829e DE |
285 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
286 | int length; | |
287 | enum debug_loc_kind kind; | |
288 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
289 | ||
290 | if (baton->from_dwo) | |
291 | kind = decode_debug_loc_dwo_addresses (baton->per_cu, | |
292 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 293 | &low, &high, byte_order); |
43988095 | 294 | else if (dwarf2_version (baton->per_cu) < 5) |
f664829e DE |
295 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
296 | &low, &high, | |
297 | byte_order, addr_size, | |
298 | signed_addr_p); | |
43988095 JK |
299 | else |
300 | kind = decode_debug_loclists_addresses (baton->per_cu, | |
301 | loc_ptr, buf_end, &new_ptr, | |
302 | &low, &high, byte_order, | |
303 | addr_size, signed_addr_p); | |
304 | ||
f664829e DE |
305 | loc_ptr = new_ptr; |
306 | switch (kind) | |
1d6edc3c | 307 | { |
f664829e | 308 | case DEBUG_LOC_END_OF_LIST: |
1d6edc3c JK |
309 | *locexpr_length = 0; |
310 | return NULL; | |
f664829e DE |
311 | case DEBUG_LOC_BASE_ADDRESS: |
312 | base_address = high + base_offset; | |
313 | continue; | |
3771a44c DE |
314 | case DEBUG_LOC_START_END: |
315 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
316 | break; |
317 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
318 | case DEBUG_LOC_INVALID_ENTRY: | |
319 | error (_("dwarf2_find_location_expression: " | |
320 | "Corrupted DWARF expression.")); | |
321 | default: | |
322 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
1d6edc3c | 323 | } |
b5758fe4 | 324 | |
bed911e5 | 325 | /* Otherwise, a location expression entry. |
8ddd5a6c DE |
326 | If the entry is from a DWO, don't add base address: the entry is from |
327 | .debug_addr which already has the DWARF "base address". We still add | |
328 | base_offset in case we're debugging a PIE executable. */ | |
329 | if (baton->from_dwo) | |
330 | { | |
331 | low += base_offset; | |
332 | high += base_offset; | |
333 | } | |
334 | else | |
bed911e5 DE |
335 | { |
336 | low += base_address; | |
337 | high += base_address; | |
338 | } | |
0d53c4c4 | 339 | |
43988095 JK |
340 | if (dwarf2_version (baton->per_cu) < 5) |
341 | { | |
342 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); | |
343 | loc_ptr += 2; | |
344 | } | |
345 | else | |
346 | { | |
347 | unsigned int bytes_read; | |
348 | ||
349 | length = read_unsigned_leb128 (NULL, loc_ptr, &bytes_read); | |
350 | loc_ptr += bytes_read; | |
351 | } | |
0d53c4c4 | 352 | |
e18b2753 JK |
353 | if (low == high && pc == low) |
354 | { | |
355 | /* This is entry PC record present only at entry point | |
356 | of a function. Verify it is really the function entry point. */ | |
357 | ||
3977b71f | 358 | const struct block *pc_block = block_for_pc (pc); |
e18b2753 JK |
359 | struct symbol *pc_func = NULL; |
360 | ||
361 | if (pc_block) | |
362 | pc_func = block_linkage_function (pc_block); | |
363 | ||
364 | if (pc_func && pc == BLOCK_START (SYMBOL_BLOCK_VALUE (pc_func))) | |
365 | { | |
366 | *locexpr_length = length; | |
367 | return loc_ptr; | |
368 | } | |
369 | } | |
370 | ||
0d53c4c4 DJ |
371 | if (pc >= low && pc < high) |
372 | { | |
373 | *locexpr_length = length; | |
374 | return loc_ptr; | |
375 | } | |
376 | ||
377 | loc_ptr += length; | |
378 | } | |
379 | } | |
380 | ||
4c2df51b DJ |
381 | /* This is the baton used when performing dwarf2 expression |
382 | evaluation. */ | |
383 | struct dwarf_expr_baton | |
384 | { | |
385 | struct frame_info *frame; | |
17ea53c3 | 386 | struct dwarf2_per_cu_data *per_cu; |
08412b07 | 387 | CORE_ADDR obj_address; |
4c2df51b DJ |
388 | }; |
389 | ||
f1e6e072 TT |
390 | /* Implement find_frame_base_location method for LOC_BLOCK functions using |
391 | DWARF expression for its DW_AT_frame_base. */ | |
392 | ||
393 | static void | |
394 | locexpr_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
395 | const gdb_byte **start, size_t *length) | |
396 | { | |
9a3c8263 SM |
397 | struct dwarf2_locexpr_baton *symbaton |
398 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
399 | |
400 | *length = symbaton->size; | |
401 | *start = symbaton->data; | |
402 | } | |
403 | ||
7d1c9c9b JB |
404 | /* Implement the struct symbol_block_ops::get_frame_base method for |
405 | LOC_BLOCK functions using a DWARF expression as its DW_AT_frame_base. */ | |
63e43d3a PMR |
406 | |
407 | static CORE_ADDR | |
7d1c9c9b | 408 | locexpr_get_frame_base (struct symbol *framefunc, struct frame_info *frame) |
63e43d3a PMR |
409 | { |
410 | struct gdbarch *gdbarch; | |
411 | struct type *type; | |
412 | struct dwarf2_locexpr_baton *dlbaton; | |
413 | const gdb_byte *start; | |
414 | size_t length; | |
415 | struct value *result; | |
416 | ||
417 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
418 | Thus, it's supposed to provide the find_frame_base_location method as | |
419 | well. */ | |
420 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
421 | ||
422 | gdbarch = get_frame_arch (frame); | |
423 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 424 | dlbaton = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); |
63e43d3a PMR |
425 | |
426 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
427 | (framefunc, get_frame_pc (frame), &start, &length); | |
428 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
429 | dlbaton->per_cu); | |
430 | ||
431 | /* The DW_AT_frame_base attribute contains a location description which | |
432 | computes the base address itself. However, the call to | |
433 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
434 | that address. The frame base address is thus this variable's | |
435 | address. */ | |
436 | return value_address (result); | |
437 | } | |
438 | ||
f1e6e072 TT |
439 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
440 | function uses DWARF expression for its DW_AT_frame_base. */ | |
441 | ||
442 | const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs = | |
443 | { | |
63e43d3a | 444 | locexpr_find_frame_base_location, |
7d1c9c9b | 445 | locexpr_get_frame_base |
f1e6e072 TT |
446 | }; |
447 | ||
448 | /* Implement find_frame_base_location method for LOC_BLOCK functions using | |
449 | DWARF location list for its DW_AT_frame_base. */ | |
450 | ||
451 | static void | |
452 | loclist_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
453 | const gdb_byte **start, size_t *length) | |
454 | { | |
9a3c8263 SM |
455 | struct dwarf2_loclist_baton *symbaton |
456 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
457 | |
458 | *start = dwarf2_find_location_expression (symbaton, length, pc); | |
459 | } | |
460 | ||
7d1c9c9b JB |
461 | /* Implement the struct symbol_block_ops::get_frame_base method for |
462 | LOC_BLOCK functions using a DWARF location list as its DW_AT_frame_base. */ | |
463 | ||
464 | static CORE_ADDR | |
465 | loclist_get_frame_base (struct symbol *framefunc, struct frame_info *frame) | |
466 | { | |
467 | struct gdbarch *gdbarch; | |
468 | struct type *type; | |
469 | struct dwarf2_loclist_baton *dlbaton; | |
470 | const gdb_byte *start; | |
471 | size_t length; | |
472 | struct value *result; | |
473 | ||
474 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
475 | Thus, it's supposed to provide the find_frame_base_location method as | |
476 | well. */ | |
477 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
478 | ||
479 | gdbarch = get_frame_arch (frame); | |
480 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 481 | dlbaton = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); |
7d1c9c9b JB |
482 | |
483 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
484 | (framefunc, get_frame_pc (frame), &start, &length); | |
485 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
486 | dlbaton->per_cu); | |
487 | ||
488 | /* The DW_AT_frame_base attribute contains a location description which | |
489 | computes the base address itself. However, the call to | |
490 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
491 | that address. The frame base address is thus this variable's | |
492 | address. */ | |
493 | return value_address (result); | |
494 | } | |
495 | ||
f1e6e072 TT |
496 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
497 | function uses DWARF location list for its DW_AT_frame_base. */ | |
498 | ||
499 | const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs = | |
500 | { | |
63e43d3a | 501 | loclist_find_frame_base_location, |
7d1c9c9b | 502 | loclist_get_frame_base |
f1e6e072 TT |
503 | }; |
504 | ||
af945b75 TT |
505 | /* See dwarf2loc.h. */ |
506 | ||
507 | void | |
508 | func_get_frame_base_dwarf_block (struct symbol *framefunc, CORE_ADDR pc, | |
509 | const gdb_byte **start, size_t *length) | |
0936ad1d | 510 | { |
f1e6e072 | 511 | if (SYMBOL_BLOCK_OPS (framefunc) != NULL) |
0d53c4c4 | 512 | { |
f1e6e072 | 513 | const struct symbol_block_ops *ops_block = SYMBOL_BLOCK_OPS (framefunc); |
22c6caba | 514 | |
f1e6e072 | 515 | ops_block->find_frame_base_location (framefunc, pc, start, length); |
0d53c4c4 DJ |
516 | } |
517 | else | |
f1e6e072 | 518 | *length = 0; |
0d53c4c4 | 519 | |
1d6edc3c | 520 | if (*length == 0) |
8a3fe4f8 | 521 | error (_("Could not find the frame base for \"%s\"."), |
0d53c4c4 | 522 | SYMBOL_NATURAL_NAME (framefunc)); |
4c2df51b DJ |
523 | } |
524 | ||
4c2df51b | 525 | static CORE_ADDR |
192ca6d8 | 526 | get_frame_pc_for_per_cu_dwarf_call (void *baton) |
4c2df51b | 527 | { |
192ca6d8 | 528 | dwarf_expr_context *ctx = (dwarf_expr_context *) baton; |
4c2df51b | 529 | |
192ca6d8 | 530 | return ctx->get_frame_pc (); |
4c2df51b DJ |
531 | } |
532 | ||
5c631832 | 533 | static void |
b64f50a1 | 534 | per_cu_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset, |
192ca6d8 | 535 | struct dwarf2_per_cu_data *per_cu) |
5c631832 JK |
536 | { |
537 | struct dwarf2_locexpr_baton block; | |
538 | ||
192ca6d8 TT |
539 | block = dwarf2_fetch_die_loc_cu_off (die_offset, per_cu, |
540 | get_frame_pc_for_per_cu_dwarf_call, | |
541 | ctx); | |
5c631832 JK |
542 | |
543 | /* DW_OP_call_ref is currently not supported. */ | |
544 | gdb_assert (block.per_cu == per_cu); | |
545 | ||
595d2e30 | 546 | ctx->eval (block.data, block.size); |
5c631832 JK |
547 | } |
548 | ||
192ca6d8 | 549 | class dwarf_evaluate_loc_desc : public dwarf_expr_context |
5c631832 | 550 | { |
192ca6d8 | 551 | public: |
5c631832 | 552 | |
192ca6d8 TT |
553 | struct frame_info *frame; |
554 | struct dwarf2_per_cu_data *per_cu; | |
555 | CORE_ADDR obj_address; | |
5c631832 | 556 | |
192ca6d8 TT |
557 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for |
558 | the frame in BATON. */ | |
8a9b8146 | 559 | |
192ca6d8 TT |
560 | CORE_ADDR get_frame_cfa () OVERRIDE |
561 | { | |
562 | return dwarf2_frame_cfa (frame); | |
563 | } | |
8a9b8146 | 564 | |
192ca6d8 TT |
565 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for |
566 | the frame in BATON. */ | |
567 | ||
568 | CORE_ADDR get_frame_pc () OVERRIDE | |
569 | { | |
570 | return get_frame_address_in_block (frame); | |
571 | } | |
572 | ||
573 | /* Using the objfile specified in BATON, find the address for the | |
574 | current thread's thread-local storage with offset OFFSET. */ | |
575 | CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE | |
576 | { | |
577 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); | |
578 | ||
579 | return target_translate_tls_address (objfile, offset); | |
580 | } | |
581 | ||
582 | /* Helper interface of per_cu_dwarf_call for | |
583 | dwarf2_evaluate_loc_desc. */ | |
584 | ||
585 | void dwarf_call (cu_offset die_offset) OVERRIDE | |
586 | { | |
587 | per_cu_dwarf_call (this, die_offset, per_cu); | |
588 | } | |
589 | ||
7d5697f9 | 590 | struct type *get_base_type (cu_offset die_offset, int size) OVERRIDE |
192ca6d8 | 591 | { |
7d5697f9 TT |
592 | struct type *result = dwarf2_get_die_type (die_offset, per_cu); |
593 | if (result == NULL) | |
216f72a1 | 594 | error (_("Could not find type for DW_OP_const_type")); |
7d5697f9 | 595 | if (size != 0 && TYPE_LENGTH (result) != size) |
216f72a1 | 596 | error (_("DW_OP_const_type has different sizes for type and data")); |
7d5697f9 | 597 | return result; |
192ca6d8 TT |
598 | } |
599 | ||
600 | /* Callback function for dwarf2_evaluate_loc_desc. | |
601 | Fetch the address indexed by DW_OP_GNU_addr_index. */ | |
602 | ||
603 | CORE_ADDR get_addr_index (unsigned int index) OVERRIDE | |
604 | { | |
605 | return dwarf2_read_addr_index (per_cu, index); | |
606 | } | |
607 | ||
608 | /* Callback function for get_object_address. Return the address of the VLA | |
609 | object. */ | |
610 | ||
611 | CORE_ADDR get_object_address () OVERRIDE | |
612 | { | |
613 | if (obj_address == 0) | |
614 | error (_("Location address is not set.")); | |
615 | return obj_address; | |
616 | } | |
617 | ||
618 | /* Execute DWARF block of call_site_parameter which matches KIND and | |
619 | KIND_U. Choose DEREF_SIZE value of that parameter. Search | |
620 | caller of this objects's frame. | |
621 | ||
622 | The caller can be from a different CU - per_cu_dwarf_call | |
623 | implementation can be more simple as it does not support cross-CU | |
624 | DWARF executions. */ | |
625 | ||
626 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
627 | union call_site_parameter_u kind_u, | |
628 | int deref_size) OVERRIDE | |
629 | { | |
630 | struct frame_info *caller_frame; | |
631 | struct dwarf2_per_cu_data *caller_per_cu; | |
192ca6d8 TT |
632 | struct call_site_parameter *parameter; |
633 | const gdb_byte *data_src; | |
634 | size_t size; | |
635 | ||
636 | caller_frame = get_prev_frame (frame); | |
637 | ||
638 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, | |
639 | &caller_per_cu); | |
640 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
641 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
642 | ||
643 | /* DEREF_SIZE size is not verified here. */ | |
644 | if (data_src == NULL) | |
645 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 646 | _("Cannot resolve DW_AT_call_data_value")); |
192ca6d8 | 647 | |
7d5697f9 TT |
648 | scoped_restore save_frame = make_scoped_restore (&this->frame, |
649 | caller_frame); | |
650 | scoped_restore save_per_cu = make_scoped_restore (&this->per_cu, | |
651 | caller_per_cu); | |
652 | scoped_restore save_obj_addr = make_scoped_restore (&this->obj_address, | |
653 | (CORE_ADDR) 0); | |
192ca6d8 TT |
654 | |
655 | scoped_restore save_arch = make_scoped_restore (&this->gdbarch); | |
656 | this->gdbarch | |
7d5697f9 | 657 | = get_objfile_arch (dwarf2_per_cu_objfile (per_cu)); |
192ca6d8 | 658 | scoped_restore save_addr_size = make_scoped_restore (&this->addr_size); |
7d5697f9 | 659 | this->addr_size = dwarf2_per_cu_addr_size (per_cu); |
192ca6d8 | 660 | scoped_restore save_offset = make_scoped_restore (&this->offset); |
7d5697f9 | 661 | this->offset = dwarf2_per_cu_text_offset (per_cu); |
192ca6d8 TT |
662 | |
663 | this->eval (data_src, size); | |
664 | } | |
665 | ||
666 | /* Using the frame specified in BATON, find the location expression | |
667 | describing the frame base. Return a pointer to it in START and | |
668 | its length in LENGTH. */ | |
669 | void get_frame_base (const gdb_byte **start, size_t * length) OVERRIDE | |
670 | { | |
671 | /* FIXME: cagney/2003-03-26: This code should be using | |
672 | get_frame_base_address(), and then implement a dwarf2 specific | |
673 | this_base method. */ | |
674 | struct symbol *framefunc; | |
675 | const struct block *bl = get_frame_block (frame, NULL); | |
676 | ||
677 | if (bl == NULL) | |
678 | error (_("frame address is not available.")); | |
679 | ||
680 | /* Use block_linkage_function, which returns a real (not inlined) | |
681 | function, instead of get_frame_function, which may return an | |
682 | inlined function. */ | |
683 | framefunc = block_linkage_function (bl); | |
684 | ||
685 | /* If we found a frame-relative symbol then it was certainly within | |
686 | some function associated with a frame. If we can't find the frame, | |
687 | something has gone wrong. */ | |
688 | gdb_assert (framefunc != NULL); | |
689 | ||
690 | func_get_frame_base_dwarf_block (framefunc, | |
691 | get_frame_address_in_block (frame), | |
692 | start, length); | |
693 | } | |
694 | ||
695 | /* Read memory at ADDR (length LEN) into BUF. */ | |
696 | ||
697 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE | |
698 | { | |
699 | read_memory (addr, buf, len); | |
700 | } | |
701 | ||
702 | /* Using the frame specified in BATON, return the value of register | |
703 | REGNUM, treated as a pointer. */ | |
704 | CORE_ADDR read_addr_from_reg (int dwarf_regnum) OVERRIDE | |
705 | { | |
706 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
707 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); | |
708 | ||
709 | return address_from_register (regnum, frame); | |
710 | } | |
711 | ||
712 | /* Implement "get_reg_value" callback. */ | |
713 | ||
714 | struct value *get_reg_value (struct type *type, int dwarf_regnum) OVERRIDE | |
715 | { | |
716 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
717 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); | |
718 | ||
719 | return value_from_register (type, regnum, frame); | |
720 | } | |
721 | }; | |
8a9b8146 | 722 | |
8e3b41a9 JK |
723 | /* See dwarf2loc.h. */ |
724 | ||
ccce17b0 | 725 | unsigned int entry_values_debug = 0; |
8e3b41a9 JK |
726 | |
727 | /* Helper to set entry_values_debug. */ | |
728 | ||
729 | static void | |
730 | show_entry_values_debug (struct ui_file *file, int from_tty, | |
731 | struct cmd_list_element *c, const char *value) | |
732 | { | |
733 | fprintf_filtered (file, | |
734 | _("Entry values and tail call frames debugging is %s.\n"), | |
735 | value); | |
736 | } | |
737 | ||
216f72a1 | 738 | /* Find DW_TAG_call_site's DW_AT_call_target address. |
8e3b41a9 JK |
739 | CALLER_FRAME (for registers) can be NULL if it is not known. This function |
740 | always returns valid address or it throws NO_ENTRY_VALUE_ERROR. */ | |
741 | ||
742 | static CORE_ADDR | |
743 | call_site_to_target_addr (struct gdbarch *call_site_gdbarch, | |
744 | struct call_site *call_site, | |
745 | struct frame_info *caller_frame) | |
746 | { | |
747 | switch (FIELD_LOC_KIND (call_site->target)) | |
748 | { | |
749 | case FIELD_LOC_KIND_DWARF_BLOCK: | |
750 | { | |
751 | struct dwarf2_locexpr_baton *dwarf_block; | |
752 | struct value *val; | |
753 | struct type *caller_core_addr_type; | |
754 | struct gdbarch *caller_arch; | |
755 | ||
756 | dwarf_block = FIELD_DWARF_BLOCK (call_site->target); | |
757 | if (dwarf_block == NULL) | |
758 | { | |
7cbd4a93 | 759 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
760 | |
761 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
762 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 763 | _("DW_AT_call_target is not specified at %s in %s"), |
8e3b41a9 | 764 | paddress (call_site_gdbarch, call_site->pc), |
7cbd4a93 | 765 | (msym.minsym == NULL ? "???" |
efd66ac6 | 766 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
767 | |
768 | } | |
769 | if (caller_frame == NULL) | |
770 | { | |
7cbd4a93 | 771 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
772 | |
773 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
774 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 775 | _("DW_AT_call_target DWARF block resolving " |
8e3b41a9 JK |
776 | "requires known frame which is currently not " |
777 | "available at %s in %s"), | |
778 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 | 779 | (msym.minsym == NULL ? "???" |
efd66ac6 | 780 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
781 | |
782 | } | |
783 | caller_arch = get_frame_arch (caller_frame); | |
784 | caller_core_addr_type = builtin_type (caller_arch)->builtin_func_ptr; | |
785 | val = dwarf2_evaluate_loc_desc (caller_core_addr_type, caller_frame, | |
786 | dwarf_block->data, dwarf_block->size, | |
787 | dwarf_block->per_cu); | |
216f72a1 | 788 | /* DW_AT_call_target is a DWARF expression, not a DWARF location. */ |
8e3b41a9 JK |
789 | if (VALUE_LVAL (val) == lval_memory) |
790 | return value_address (val); | |
791 | else | |
792 | return value_as_address (val); | |
793 | } | |
794 | ||
795 | case FIELD_LOC_KIND_PHYSNAME: | |
796 | { | |
797 | const char *physname; | |
3b7344d5 | 798 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
799 | |
800 | physname = FIELD_STATIC_PHYSNAME (call_site->target); | |
9112db09 JK |
801 | |
802 | /* Handle both the mangled and demangled PHYSNAME. */ | |
803 | msym = lookup_minimal_symbol (physname, NULL, NULL); | |
3b7344d5 | 804 | if (msym.minsym == NULL) |
8e3b41a9 | 805 | { |
3b7344d5 | 806 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); |
8e3b41a9 JK |
807 | throw_error (NO_ENTRY_VALUE_ERROR, |
808 | _("Cannot find function \"%s\" for a call site target " | |
809 | "at %s in %s"), | |
810 | physname, paddress (call_site_gdbarch, call_site->pc), | |
3b7344d5 TT |
811 | (msym.minsym == NULL ? "???" |
812 | : MSYMBOL_PRINT_NAME (msym.minsym))); | |
8e3b41a9 JK |
813 | |
814 | } | |
77e371c0 | 815 | return BMSYMBOL_VALUE_ADDRESS (msym); |
8e3b41a9 JK |
816 | } |
817 | ||
818 | case FIELD_LOC_KIND_PHYSADDR: | |
819 | return FIELD_STATIC_PHYSADDR (call_site->target); | |
820 | ||
821 | default: | |
822 | internal_error (__FILE__, __LINE__, _("invalid call site target kind")); | |
823 | } | |
824 | } | |
825 | ||
111c6489 JK |
826 | /* Convert function entry point exact address ADDR to the function which is |
827 | compliant with TAIL_CALL_LIST_COMPLETE condition. Throw | |
828 | NO_ENTRY_VALUE_ERROR otherwise. */ | |
829 | ||
830 | static struct symbol * | |
831 | func_addr_to_tail_call_list (struct gdbarch *gdbarch, CORE_ADDR addr) | |
832 | { | |
833 | struct symbol *sym = find_pc_function (addr); | |
834 | struct type *type; | |
835 | ||
836 | if (sym == NULL || BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) != addr) | |
837 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 838 | _("DW_TAG_call_site resolving failed to find function " |
111c6489 JK |
839 | "name for address %s"), |
840 | paddress (gdbarch, addr)); | |
841 | ||
842 | type = SYMBOL_TYPE (sym); | |
843 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FUNC); | |
844 | gdb_assert (TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_FUNC); | |
845 | ||
846 | return sym; | |
847 | } | |
848 | ||
2d6c5dc2 JK |
849 | /* Verify function with entry point exact address ADDR can never call itself |
850 | via its tail calls (incl. transitively). Throw NO_ENTRY_VALUE_ERROR if it | |
851 | can call itself via tail calls. | |
852 | ||
853 | If a funtion can tail call itself its entry value based parameters are | |
854 | unreliable. There is no verification whether the value of some/all | |
855 | parameters is unchanged through the self tail call, we expect if there is | |
856 | a self tail call all the parameters can be modified. */ | |
857 | ||
858 | static void | |
859 | func_verify_no_selftailcall (struct gdbarch *gdbarch, CORE_ADDR verify_addr) | |
860 | { | |
2d6c5dc2 JK |
861 | CORE_ADDR addr; |
862 | ||
2d6c5dc2 JK |
863 | /* The verification is completely unordered. Track here function addresses |
864 | which still need to be iterated. */ | |
fc4007c9 | 865 | std::vector<CORE_ADDR> todo; |
2d6c5dc2 | 866 | |
fc4007c9 TT |
867 | /* Track here CORE_ADDRs which were already visited. */ |
868 | std::unordered_set<CORE_ADDR> addr_hash; | |
2d6c5dc2 | 869 | |
fc4007c9 TT |
870 | todo.push_back (verify_addr); |
871 | while (!todo.empty ()) | |
2d6c5dc2 JK |
872 | { |
873 | struct symbol *func_sym; | |
874 | struct call_site *call_site; | |
875 | ||
fc4007c9 TT |
876 | addr = todo.back (); |
877 | todo.pop_back (); | |
2d6c5dc2 JK |
878 | |
879 | func_sym = func_addr_to_tail_call_list (gdbarch, addr); | |
880 | ||
881 | for (call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (func_sym)); | |
882 | call_site; call_site = call_site->tail_call_next) | |
883 | { | |
884 | CORE_ADDR target_addr; | |
2d6c5dc2 JK |
885 | |
886 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
887 | frames. */ | |
888 | target_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
889 | ||
890 | if (target_addr == verify_addr) | |
891 | { | |
7cbd4a93 | 892 | struct bound_minimal_symbol msym; |
2d6c5dc2 JK |
893 | |
894 | msym = lookup_minimal_symbol_by_pc (verify_addr); | |
895 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 896 | _("DW_OP_entry_value resolving has found " |
2d6c5dc2 JK |
897 | "function \"%s\" at %s can call itself via tail " |
898 | "calls"), | |
7cbd4a93 | 899 | (msym.minsym == NULL ? "???" |
efd66ac6 | 900 | : MSYMBOL_PRINT_NAME (msym.minsym)), |
2d6c5dc2 JK |
901 | paddress (gdbarch, verify_addr)); |
902 | } | |
903 | ||
fc4007c9 TT |
904 | if (addr_hash.insert (target_addr).second) |
905 | todo.push_back (target_addr); | |
2d6c5dc2 JK |
906 | } |
907 | } | |
2d6c5dc2 JK |
908 | } |
909 | ||
111c6489 JK |
910 | /* Print user readable form of CALL_SITE->PC to gdb_stdlog. Used only for |
911 | ENTRY_VALUES_DEBUG. */ | |
912 | ||
913 | static void | |
914 | tailcall_dump (struct gdbarch *gdbarch, const struct call_site *call_site) | |
915 | { | |
916 | CORE_ADDR addr = call_site->pc; | |
7cbd4a93 | 917 | struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (addr - 1); |
111c6489 JK |
918 | |
919 | fprintf_unfiltered (gdb_stdlog, " %s(%s)", paddress (gdbarch, addr), | |
7cbd4a93 | 920 | (msym.minsym == NULL ? "???" |
efd66ac6 | 921 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
111c6489 JK |
922 | |
923 | } | |
924 | ||
111c6489 JK |
925 | /* Intersect RESULTP with CHAIN to keep RESULTP unambiguous, keep in RESULTP |
926 | only top callers and bottom callees which are present in both. GDBARCH is | |
927 | used only for ENTRY_VALUES_DEBUG. RESULTP is NULL after return if there are | |
928 | no remaining possibilities to provide unambiguous non-trivial result. | |
929 | RESULTP should point to NULL on the first (initialization) call. Caller is | |
930 | responsible for xfree of any RESULTP data. */ | |
931 | ||
932 | static void | |
fc4007c9 TT |
933 | chain_candidate (struct gdbarch *gdbarch, |
934 | gdb::unique_xmalloc_ptr<struct call_site_chain> *resultp, | |
935 | std::vector<struct call_site *> *chain) | |
111c6489 | 936 | { |
fc4007c9 | 937 | long length = chain->size (); |
111c6489 JK |
938 | int callers, callees, idx; |
939 | ||
fc4007c9 | 940 | if (*resultp == NULL) |
111c6489 JK |
941 | { |
942 | /* Create the initial chain containing all the passed PCs. */ | |
943 | ||
fc4007c9 TT |
944 | struct call_site_chain *result |
945 | = ((struct call_site_chain *) | |
946 | xmalloc (sizeof (*result) | |
947 | + sizeof (*result->call_site) * (length - 1))); | |
111c6489 JK |
948 | result->length = length; |
949 | result->callers = result->callees = length; | |
fc4007c9 TT |
950 | if (!chain->empty ()) |
951 | memcpy (result->call_site, chain->data (), | |
19a1b230 | 952 | sizeof (*result->call_site) * length); |
fc4007c9 | 953 | resultp->reset (result); |
111c6489 JK |
954 | |
955 | if (entry_values_debug) | |
956 | { | |
957 | fprintf_unfiltered (gdb_stdlog, "tailcall: initial:"); | |
958 | for (idx = 0; idx < length; idx++) | |
959 | tailcall_dump (gdbarch, result->call_site[idx]); | |
960 | fputc_unfiltered ('\n', gdb_stdlog); | |
961 | } | |
962 | ||
963 | return; | |
964 | } | |
965 | ||
966 | if (entry_values_debug) | |
967 | { | |
968 | fprintf_unfiltered (gdb_stdlog, "tailcall: compare:"); | |
969 | for (idx = 0; idx < length; idx++) | |
fc4007c9 | 970 | tailcall_dump (gdbarch, chain->at (idx)); |
111c6489 JK |
971 | fputc_unfiltered ('\n', gdb_stdlog); |
972 | } | |
973 | ||
974 | /* Intersect callers. */ | |
975 | ||
fc4007c9 | 976 | callers = std::min ((long) (*resultp)->callers, length); |
111c6489 | 977 | for (idx = 0; idx < callers; idx++) |
fc4007c9 | 978 | if ((*resultp)->call_site[idx] != chain->at (idx)) |
111c6489 | 979 | { |
fc4007c9 | 980 | (*resultp)->callers = idx; |
111c6489 JK |
981 | break; |
982 | } | |
983 | ||
984 | /* Intersect callees. */ | |
985 | ||
fc4007c9 | 986 | callees = std::min ((long) (*resultp)->callees, length); |
111c6489 | 987 | for (idx = 0; idx < callees; idx++) |
fc4007c9 TT |
988 | if ((*resultp)->call_site[(*resultp)->length - 1 - idx] |
989 | != chain->at (length - 1 - idx)) | |
111c6489 | 990 | { |
fc4007c9 | 991 | (*resultp)->callees = idx; |
111c6489 JK |
992 | break; |
993 | } | |
994 | ||
995 | if (entry_values_debug) | |
996 | { | |
997 | fprintf_unfiltered (gdb_stdlog, "tailcall: reduced:"); | |
fc4007c9 TT |
998 | for (idx = 0; idx < (*resultp)->callers; idx++) |
999 | tailcall_dump (gdbarch, (*resultp)->call_site[idx]); | |
111c6489 | 1000 | fputs_unfiltered (" |", gdb_stdlog); |
fc4007c9 TT |
1001 | for (idx = 0; idx < (*resultp)->callees; idx++) |
1002 | tailcall_dump (gdbarch, | |
1003 | (*resultp)->call_site[(*resultp)->length | |
1004 | - (*resultp)->callees + idx]); | |
111c6489 JK |
1005 | fputc_unfiltered ('\n', gdb_stdlog); |
1006 | } | |
1007 | ||
fc4007c9 | 1008 | if ((*resultp)->callers == 0 && (*resultp)->callees == 0) |
111c6489 JK |
1009 | { |
1010 | /* There are no common callers or callees. It could be also a direct | |
1011 | call (which has length 0) with ambiguous possibility of an indirect | |
1012 | call - CALLERS == CALLEES == 0 is valid during the first allocation | |
1013 | but any subsequence processing of such entry means ambiguity. */ | |
fc4007c9 | 1014 | resultp->reset (NULL); |
111c6489 JK |
1015 | return; |
1016 | } | |
1017 | ||
1018 | /* See call_site_find_chain_1 why there is no way to reach the bottom callee | |
1019 | PC again. In such case there must be two different code paths to reach | |
e0619de6 | 1020 | it. CALLERS + CALLEES equal to LENGTH in the case of self tail-call. */ |
fc4007c9 | 1021 | gdb_assert ((*resultp)->callers + (*resultp)->callees <= (*resultp)->length); |
111c6489 JK |
1022 | } |
1023 | ||
1024 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1025 | assumed frames between them use GDBARCH. Use depth first search so we can | |
1026 | keep single CHAIN of call_site's back to CALLER_PC. Function recursion | |
1027 | would have needless GDB stack overhead. Caller is responsible for xfree of | |
1028 | the returned result. Any unreliability results in thrown | |
1029 | NO_ENTRY_VALUE_ERROR. */ | |
1030 | ||
1031 | static struct call_site_chain * | |
1032 | call_site_find_chain_1 (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
1033 | CORE_ADDR callee_pc) | |
1034 | { | |
c4be5165 | 1035 | CORE_ADDR save_callee_pc = callee_pc; |
fc4007c9 | 1036 | gdb::unique_xmalloc_ptr<struct call_site_chain> retval; |
111c6489 JK |
1037 | struct call_site *call_site; |
1038 | ||
111c6489 JK |
1039 | /* CHAIN contains only the intermediate CALL_SITEs. Neither CALLER_PC's |
1040 | call_site nor any possible call_site at CALLEE_PC's function is there. | |
1041 | Any CALL_SITE in CHAIN will be iterated to its siblings - via | |
1042 | TAIL_CALL_NEXT. This is inappropriate for CALLER_PC's call_site. */ | |
fc4007c9 | 1043 | std::vector<struct call_site *> chain; |
111c6489 JK |
1044 | |
1045 | /* We are not interested in the specific PC inside the callee function. */ | |
1046 | callee_pc = get_pc_function_start (callee_pc); | |
1047 | if (callee_pc == 0) | |
1048 | throw_error (NO_ENTRY_VALUE_ERROR, _("Unable to find function for PC %s"), | |
c4be5165 | 1049 | paddress (gdbarch, save_callee_pc)); |
111c6489 | 1050 | |
fc4007c9 TT |
1051 | /* Mark CALL_SITEs so we do not visit the same ones twice. */ |
1052 | std::unordered_set<CORE_ADDR> addr_hash; | |
111c6489 JK |
1053 | |
1054 | /* Do not push CALL_SITE to CHAIN. Push there only the first tail call site | |
1055 | at the target's function. All the possible tail call sites in the | |
1056 | target's function will get iterated as already pushed into CHAIN via their | |
1057 | TAIL_CALL_NEXT. */ | |
1058 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1059 | ||
1060 | while (call_site) | |
1061 | { | |
1062 | CORE_ADDR target_func_addr; | |
1063 | struct call_site *target_call_site; | |
1064 | ||
1065 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
1066 | frames. */ | |
1067 | target_func_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
1068 | ||
1069 | if (target_func_addr == callee_pc) | |
1070 | { | |
fc4007c9 | 1071 | chain_candidate (gdbarch, &retval, &chain); |
111c6489 JK |
1072 | if (retval == NULL) |
1073 | break; | |
1074 | ||
1075 | /* There is no way to reach CALLEE_PC again as we would prevent | |
1076 | entering it twice as being already marked in ADDR_HASH. */ | |
1077 | target_call_site = NULL; | |
1078 | } | |
1079 | else | |
1080 | { | |
1081 | struct symbol *target_func; | |
1082 | ||
1083 | target_func = func_addr_to_tail_call_list (gdbarch, target_func_addr); | |
1084 | target_call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (target_func)); | |
1085 | } | |
1086 | ||
1087 | do | |
1088 | { | |
1089 | /* Attempt to visit TARGET_CALL_SITE. */ | |
1090 | ||
1091 | if (target_call_site) | |
1092 | { | |
fc4007c9 | 1093 | if (addr_hash.insert (target_call_site->pc).second) |
111c6489 JK |
1094 | { |
1095 | /* Successfully entered TARGET_CALL_SITE. */ | |
1096 | ||
fc4007c9 | 1097 | chain.push_back (target_call_site); |
111c6489 JK |
1098 | break; |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* Backtrack (without revisiting the originating call_site). Try the | |
1103 | callers's sibling; if there isn't any try the callers's callers's | |
1104 | sibling etc. */ | |
1105 | ||
1106 | target_call_site = NULL; | |
fc4007c9 | 1107 | while (!chain.empty ()) |
111c6489 | 1108 | { |
fc4007c9 TT |
1109 | call_site = chain.back (); |
1110 | chain.pop_back (); | |
111c6489 | 1111 | |
fc4007c9 TT |
1112 | size_t removed = addr_hash.erase (call_site->pc); |
1113 | gdb_assert (removed == 1); | |
111c6489 JK |
1114 | |
1115 | target_call_site = call_site->tail_call_next; | |
1116 | if (target_call_site) | |
1117 | break; | |
1118 | } | |
1119 | } | |
1120 | while (target_call_site); | |
1121 | ||
fc4007c9 | 1122 | if (chain.empty ()) |
111c6489 JK |
1123 | call_site = NULL; |
1124 | else | |
fc4007c9 | 1125 | call_site = chain.back (); |
111c6489 JK |
1126 | } |
1127 | ||
1128 | if (retval == NULL) | |
1129 | { | |
7cbd4a93 | 1130 | struct bound_minimal_symbol msym_caller, msym_callee; |
111c6489 JK |
1131 | |
1132 | msym_caller = lookup_minimal_symbol_by_pc (caller_pc); | |
1133 | msym_callee = lookup_minimal_symbol_by_pc (callee_pc); | |
1134 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1135 | _("There are no unambiguously determinable intermediate " | |
1136 | "callers or callees between caller function \"%s\" at %s " | |
1137 | "and callee function \"%s\" at %s"), | |
7cbd4a93 | 1138 | (msym_caller.minsym == NULL |
efd66ac6 | 1139 | ? "???" : MSYMBOL_PRINT_NAME (msym_caller.minsym)), |
111c6489 | 1140 | paddress (gdbarch, caller_pc), |
7cbd4a93 | 1141 | (msym_callee.minsym == NULL |
efd66ac6 | 1142 | ? "???" : MSYMBOL_PRINT_NAME (msym_callee.minsym)), |
111c6489 JK |
1143 | paddress (gdbarch, callee_pc)); |
1144 | } | |
1145 | ||
fc4007c9 | 1146 | return retval.release (); |
111c6489 JK |
1147 | } |
1148 | ||
1149 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1150 | assumed frames between them use GDBARCH. If valid call_site_chain cannot be | |
1151 | constructed return NULL. Caller is responsible for xfree of the returned | |
1152 | result. */ | |
1153 | ||
1154 | struct call_site_chain * | |
1155 | call_site_find_chain (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
1156 | CORE_ADDR callee_pc) | |
1157 | { | |
111c6489 JK |
1158 | struct call_site_chain *retval = NULL; |
1159 | ||
492d29ea | 1160 | TRY |
111c6489 JK |
1161 | { |
1162 | retval = call_site_find_chain_1 (gdbarch, caller_pc, callee_pc); | |
1163 | } | |
492d29ea | 1164 | CATCH (e, RETURN_MASK_ERROR) |
111c6489 JK |
1165 | { |
1166 | if (e.error == NO_ENTRY_VALUE_ERROR) | |
1167 | { | |
1168 | if (entry_values_debug) | |
1169 | exception_print (gdb_stdout, e); | |
1170 | ||
1171 | return NULL; | |
1172 | } | |
1173 | else | |
1174 | throw_exception (e); | |
1175 | } | |
492d29ea PA |
1176 | END_CATCH |
1177 | ||
111c6489 JK |
1178 | return retval; |
1179 | } | |
1180 | ||
24c5c679 JK |
1181 | /* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */ |
1182 | ||
1183 | static int | |
1184 | call_site_parameter_matches (struct call_site_parameter *parameter, | |
1185 | enum call_site_parameter_kind kind, | |
1186 | union call_site_parameter_u kind_u) | |
1187 | { | |
1188 | if (kind == parameter->kind) | |
1189 | switch (kind) | |
1190 | { | |
1191 | case CALL_SITE_PARAMETER_DWARF_REG: | |
1192 | return kind_u.dwarf_reg == parameter->u.dwarf_reg; | |
1193 | case CALL_SITE_PARAMETER_FB_OFFSET: | |
1194 | return kind_u.fb_offset == parameter->u.fb_offset; | |
1788b2d3 | 1195 | case CALL_SITE_PARAMETER_PARAM_OFFSET: |
9c541725 | 1196 | return kind_u.param_cu_off == parameter->u.param_cu_off; |
24c5c679 JK |
1197 | } |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | /* Fetch call_site_parameter from caller matching KIND and KIND_U. | |
1202 | FRAME is for callee. | |
8e3b41a9 JK |
1203 | |
1204 | Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR | |
1205 | otherwise. */ | |
1206 | ||
1207 | static struct call_site_parameter * | |
24c5c679 JK |
1208 | dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, |
1209 | enum call_site_parameter_kind kind, | |
1210 | union call_site_parameter_u kind_u, | |
8e3b41a9 JK |
1211 | struct dwarf2_per_cu_data **per_cu_return) |
1212 | { | |
9e3a7d65 JK |
1213 | CORE_ADDR func_addr, caller_pc; |
1214 | struct gdbarch *gdbarch; | |
1215 | struct frame_info *caller_frame; | |
8e3b41a9 JK |
1216 | struct call_site *call_site; |
1217 | int iparams; | |
509f0fd9 JK |
1218 | /* Initialize it just to avoid a GCC false warning. */ |
1219 | struct call_site_parameter *parameter = NULL; | |
8e3b41a9 JK |
1220 | CORE_ADDR target_addr; |
1221 | ||
9e3a7d65 JK |
1222 | while (get_frame_type (frame) == INLINE_FRAME) |
1223 | { | |
1224 | frame = get_prev_frame (frame); | |
1225 | gdb_assert (frame != NULL); | |
1226 | } | |
1227 | ||
1228 | func_addr = get_frame_func (frame); | |
1229 | gdbarch = get_frame_arch (frame); | |
1230 | caller_frame = get_prev_frame (frame); | |
8e3b41a9 JK |
1231 | if (gdbarch != frame_unwind_arch (frame)) |
1232 | { | |
7cbd4a93 TT |
1233 | struct bound_minimal_symbol msym |
1234 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1235 | struct gdbarch *caller_gdbarch = frame_unwind_arch (frame); |
1236 | ||
1237 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1238 | _("DW_OP_entry_value resolving callee gdbarch %s " |
8e3b41a9 JK |
1239 | "(of %s (%s)) does not match caller gdbarch %s"), |
1240 | gdbarch_bfd_arch_info (gdbarch)->printable_name, | |
1241 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1242 | (msym.minsym == NULL ? "???" |
efd66ac6 | 1243 | : MSYMBOL_PRINT_NAME (msym.minsym)), |
8e3b41a9 JK |
1244 | gdbarch_bfd_arch_info (caller_gdbarch)->printable_name); |
1245 | } | |
1246 | ||
1247 | if (caller_frame == NULL) | |
1248 | { | |
7cbd4a93 TT |
1249 | struct bound_minimal_symbol msym |
1250 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 | 1251 | |
216f72a1 | 1252 | throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_entry_value resolving " |
8e3b41a9 JK |
1253 | "requires caller of %s (%s)"), |
1254 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1255 | (msym.minsym == NULL ? "???" |
efd66ac6 | 1256 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
1257 | } |
1258 | caller_pc = get_frame_pc (caller_frame); | |
1259 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1260 | ||
1261 | target_addr = call_site_to_target_addr (gdbarch, call_site, caller_frame); | |
1262 | if (target_addr != func_addr) | |
1263 | { | |
1264 | struct minimal_symbol *target_msym, *func_msym; | |
1265 | ||
7cbd4a93 TT |
1266 | target_msym = lookup_minimal_symbol_by_pc (target_addr).minsym; |
1267 | func_msym = lookup_minimal_symbol_by_pc (func_addr).minsym; | |
8e3b41a9 | 1268 | throw_error (NO_ENTRY_VALUE_ERROR, |
216f72a1 | 1269 | _("DW_OP_entry_value resolving expects callee %s at %s " |
8e3b41a9 JK |
1270 | "but the called frame is for %s at %s"), |
1271 | (target_msym == NULL ? "???" | |
efd66ac6 | 1272 | : MSYMBOL_PRINT_NAME (target_msym)), |
8e3b41a9 | 1273 | paddress (gdbarch, target_addr), |
efd66ac6 | 1274 | func_msym == NULL ? "???" : MSYMBOL_PRINT_NAME (func_msym), |
8e3b41a9 JK |
1275 | paddress (gdbarch, func_addr)); |
1276 | } | |
1277 | ||
2d6c5dc2 JK |
1278 | /* No entry value based parameters would be reliable if this function can |
1279 | call itself via tail calls. */ | |
1280 | func_verify_no_selftailcall (gdbarch, func_addr); | |
1281 | ||
8e3b41a9 JK |
1282 | for (iparams = 0; iparams < call_site->parameter_count; iparams++) |
1283 | { | |
1284 | parameter = &call_site->parameter[iparams]; | |
24c5c679 | 1285 | if (call_site_parameter_matches (parameter, kind, kind_u)) |
8e3b41a9 JK |
1286 | break; |
1287 | } | |
1288 | if (iparams == call_site->parameter_count) | |
1289 | { | |
7cbd4a93 TT |
1290 | struct minimal_symbol *msym |
1291 | = lookup_minimal_symbol_by_pc (caller_pc).minsym; | |
8e3b41a9 | 1292 | |
216f72a1 | 1293 | /* DW_TAG_call_site_parameter will be missing just if GCC could not |
8e3b41a9 JK |
1294 | determine its value. */ |
1295 | throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot find matching parameter " | |
216f72a1 | 1296 | "at DW_TAG_call_site %s at %s"), |
8e3b41a9 | 1297 | paddress (gdbarch, caller_pc), |
efd66ac6 | 1298 | msym == NULL ? "???" : MSYMBOL_PRINT_NAME (msym)); |
8e3b41a9 JK |
1299 | } |
1300 | ||
1301 | *per_cu_return = call_site->per_cu; | |
1302 | return parameter; | |
1303 | } | |
1304 | ||
a471c594 | 1305 | /* Return value for PARAMETER matching DEREF_SIZE. If DEREF_SIZE is -1, return |
216f72a1 JK |
1306 | the normal DW_AT_call_value block. Otherwise return the |
1307 | DW_AT_call_data_value (dereferenced) block. | |
e18b2753 JK |
1308 | |
1309 | TYPE and CALLER_FRAME specify how to evaluate the DWARF block into returned | |
1310 | struct value. | |
1311 | ||
1312 | Function always returns non-NULL, non-optimized out value. It throws | |
1313 | NO_ENTRY_VALUE_ERROR if it cannot resolve the value for any reason. */ | |
1314 | ||
1315 | static struct value * | |
1316 | dwarf_entry_parameter_to_value (struct call_site_parameter *parameter, | |
a471c594 | 1317 | CORE_ADDR deref_size, struct type *type, |
e18b2753 JK |
1318 | struct frame_info *caller_frame, |
1319 | struct dwarf2_per_cu_data *per_cu) | |
1320 | { | |
a471c594 | 1321 | const gdb_byte *data_src; |
e18b2753 | 1322 | gdb_byte *data; |
a471c594 JK |
1323 | size_t size; |
1324 | ||
1325 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
1326 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1327 | ||
1328 | /* DEREF_SIZE size is not verified here. */ | |
1329 | if (data_src == NULL) | |
1330 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1331 | _("Cannot resolve DW_AT_call_data_value")); |
e18b2753 | 1332 | |
216f72a1 | 1333 | /* DW_AT_call_value is a DWARF expression, not a DWARF |
e18b2753 JK |
1334 | location. Postprocessing of DWARF_VALUE_MEMORY would lose the type from |
1335 | DWARF block. */ | |
224c3ddb | 1336 | data = (gdb_byte *) alloca (size + 1); |
a471c594 JK |
1337 | memcpy (data, data_src, size); |
1338 | data[size] = DW_OP_stack_value; | |
e18b2753 | 1339 | |
a471c594 | 1340 | return dwarf2_evaluate_loc_desc (type, caller_frame, data, size + 1, per_cu); |
e18b2753 JK |
1341 | } |
1342 | ||
a471c594 JK |
1343 | /* VALUE must be of type lval_computed with entry_data_value_funcs. Perform |
1344 | the indirect method on it, that is use its stored target value, the sole | |
1345 | purpose of entry_data_value_funcs.. */ | |
1346 | ||
1347 | static struct value * | |
1348 | entry_data_value_coerce_ref (const struct value *value) | |
1349 | { | |
1350 | struct type *checked_type = check_typedef (value_type (value)); | |
1351 | struct value *target_val; | |
1352 | ||
aa006118 | 1353 | if (!TYPE_IS_REFERENCE (checked_type)) |
a471c594 JK |
1354 | return NULL; |
1355 | ||
9a3c8263 | 1356 | target_val = (struct value *) value_computed_closure (value); |
a471c594 JK |
1357 | value_incref (target_val); |
1358 | return target_val; | |
1359 | } | |
1360 | ||
1361 | /* Implement copy_closure. */ | |
1362 | ||
1363 | static void * | |
1364 | entry_data_value_copy_closure (const struct value *v) | |
1365 | { | |
9a3c8263 | 1366 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1367 | |
1368 | value_incref (target_val); | |
1369 | return target_val; | |
1370 | } | |
1371 | ||
1372 | /* Implement free_closure. */ | |
1373 | ||
1374 | static void | |
1375 | entry_data_value_free_closure (struct value *v) | |
1376 | { | |
9a3c8263 | 1377 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1378 | |
1379 | value_free (target_val); | |
1380 | } | |
1381 | ||
1382 | /* Vector for methods for an entry value reference where the referenced value | |
1383 | is stored in the caller. On the first dereference use | |
216f72a1 | 1384 | DW_AT_call_data_value in the caller. */ |
a471c594 JK |
1385 | |
1386 | static const struct lval_funcs entry_data_value_funcs = | |
1387 | { | |
1388 | NULL, /* read */ | |
1389 | NULL, /* write */ | |
a471c594 JK |
1390 | NULL, /* indirect */ |
1391 | entry_data_value_coerce_ref, | |
1392 | NULL, /* check_synthetic_pointer */ | |
1393 | entry_data_value_copy_closure, | |
1394 | entry_data_value_free_closure | |
1395 | }; | |
1396 | ||
24c5c679 JK |
1397 | /* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U |
1398 | are used to match DW_AT_location at the caller's | |
216f72a1 | 1399 | DW_TAG_call_site_parameter. |
e18b2753 JK |
1400 | |
1401 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1402 | cannot resolve the parameter for any reason. */ | |
1403 | ||
1404 | static struct value * | |
1405 | value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame, | |
24c5c679 JK |
1406 | enum call_site_parameter_kind kind, |
1407 | union call_site_parameter_u kind_u) | |
e18b2753 | 1408 | { |
a471c594 JK |
1409 | struct type *checked_type = check_typedef (type); |
1410 | struct type *target_type = TYPE_TARGET_TYPE (checked_type); | |
e18b2753 | 1411 | struct frame_info *caller_frame = get_prev_frame (frame); |
a471c594 | 1412 | struct value *outer_val, *target_val, *val; |
e18b2753 JK |
1413 | struct call_site_parameter *parameter; |
1414 | struct dwarf2_per_cu_data *caller_per_cu; | |
1415 | ||
24c5c679 | 1416 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
e18b2753 JK |
1417 | &caller_per_cu); |
1418 | ||
a471c594 JK |
1419 | outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */, |
1420 | type, caller_frame, | |
1421 | caller_per_cu); | |
1422 | ||
216f72a1 | 1423 | /* Check if DW_AT_call_data_value cannot be used. If it should be |
a471c594 JK |
1424 | used and it is not available do not fall back to OUTER_VAL - dereferencing |
1425 | TYPE_CODE_REF with non-entry data value would give current value - not the | |
1426 | entry value. */ | |
1427 | ||
aa006118 | 1428 | if (!TYPE_IS_REFERENCE (checked_type) |
a471c594 JK |
1429 | || TYPE_TARGET_TYPE (checked_type) == NULL) |
1430 | return outer_val; | |
1431 | ||
1432 | target_val = dwarf_entry_parameter_to_value (parameter, | |
1433 | TYPE_LENGTH (target_type), | |
1434 | target_type, caller_frame, | |
1435 | caller_per_cu); | |
1436 | ||
a471c594 JK |
1437 | release_value (target_val); |
1438 | val = allocate_computed_value (type, &entry_data_value_funcs, | |
1439 | target_val /* closure */); | |
1440 | ||
1441 | /* Copy the referencing pointer to the new computed value. */ | |
1442 | memcpy (value_contents_raw (val), value_contents_raw (outer_val), | |
1443 | TYPE_LENGTH (checked_type)); | |
1444 | set_value_lazy (val, 0); | |
1445 | ||
1446 | return val; | |
e18b2753 JK |
1447 | } |
1448 | ||
1449 | /* Read parameter of TYPE at (callee) FRAME's function entry. DATA and | |
1450 | SIZE are DWARF block used to match DW_AT_location at the caller's | |
216f72a1 | 1451 | DW_TAG_call_site_parameter. |
e18b2753 JK |
1452 | |
1453 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1454 | cannot resolve the parameter for any reason. */ | |
1455 | ||
1456 | static struct value * | |
1457 | value_of_dwarf_block_entry (struct type *type, struct frame_info *frame, | |
1458 | const gdb_byte *block, size_t block_len) | |
1459 | { | |
24c5c679 | 1460 | union call_site_parameter_u kind_u; |
e18b2753 | 1461 | |
24c5c679 JK |
1462 | kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len); |
1463 | if (kind_u.dwarf_reg != -1) | |
1464 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG, | |
1465 | kind_u); | |
e18b2753 | 1466 | |
24c5c679 JK |
1467 | if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset)) |
1468 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET, | |
1469 | kind_u); | |
e18b2753 JK |
1470 | |
1471 | /* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message | |
1472 | suppressed during normal operation. The expression can be arbitrary if | |
1473 | there is no caller-callee entry value binding expected. */ | |
1474 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1475 | _("DWARF-2 expression error: DW_OP_entry_value is supported " |
e18b2753 JK |
1476 | "only for single DW_OP_reg* or for DW_OP_fbreg(*)")); |
1477 | } | |
1478 | ||
052b9502 NF |
1479 | struct piece_closure |
1480 | { | |
88bfdde4 | 1481 | /* Reference count. */ |
1e467161 | 1482 | int refc = 0; |
88bfdde4 | 1483 | |
8cf6f0b1 | 1484 | /* The CU from which this closure's expression came. */ |
1e467161 | 1485 | struct dwarf2_per_cu_data *per_cu = NULL; |
052b9502 | 1486 | |
1e467161 SM |
1487 | /* The pieces describing this variable. */ |
1488 | std::vector<dwarf_expr_piece> pieces; | |
ee40d8d4 YQ |
1489 | |
1490 | /* Frame ID of frame to which a register value is relative, used | |
1491 | only by DWARF_VALUE_REGISTER. */ | |
1492 | struct frame_id frame_id; | |
052b9502 NF |
1493 | }; |
1494 | ||
1495 | /* Allocate a closure for a value formed from separately-described | |
1496 | PIECES. */ | |
1497 | ||
1498 | static struct piece_closure * | |
8cf6f0b1 | 1499 | allocate_piece_closure (struct dwarf2_per_cu_data *per_cu, |
1e467161 | 1500 | std::vector<dwarf_expr_piece> &&pieces, |
ddd7882a | 1501 | struct frame_info *frame) |
052b9502 | 1502 | { |
1e467161 | 1503 | struct piece_closure *c = new piece_closure; |
052b9502 | 1504 | |
88bfdde4 | 1505 | c->refc = 1; |
8cf6f0b1 | 1506 | c->per_cu = per_cu; |
1e467161 | 1507 | c->pieces = std::move (pieces); |
ee40d8d4 YQ |
1508 | if (frame == NULL) |
1509 | c->frame_id = null_frame_id; | |
1510 | else | |
1511 | c->frame_id = get_frame_id (frame); | |
052b9502 | 1512 | |
1e467161 SM |
1513 | for (dwarf_expr_piece &piece : c->pieces) |
1514 | if (piece.location == DWARF_VALUE_STACK) | |
1515 | value_incref (piece.v.value); | |
052b9502 NF |
1516 | |
1517 | return c; | |
1518 | } | |
1519 | ||
22347e55 AA |
1520 | /* Copy NBITS bits from SOURCE to DEST starting at the given bit |
1521 | offsets. Use the bit order as specified by BITS_BIG_ENDIAN. | |
1522 | Source and destination buffers must not overlap. */ | |
d3b1e874 TT |
1523 | |
1524 | static void | |
22347e55 AA |
1525 | copy_bitwise (gdb_byte *dest, ULONGEST dest_offset, |
1526 | const gdb_byte *source, ULONGEST source_offset, | |
1527 | ULONGEST nbits, int bits_big_endian) | |
d3b1e874 | 1528 | { |
22347e55 | 1529 | unsigned int buf, avail; |
d3b1e874 | 1530 | |
22347e55 AA |
1531 | if (nbits == 0) |
1532 | return; | |
d3b1e874 | 1533 | |
d3b1e874 TT |
1534 | if (bits_big_endian) |
1535 | { | |
22347e55 AA |
1536 | /* Start from the end, then work backwards. */ |
1537 | dest_offset += nbits - 1; | |
1538 | dest += dest_offset / 8; | |
1539 | dest_offset = 7 - dest_offset % 8; | |
1540 | source_offset += nbits - 1; | |
1541 | source += source_offset / 8; | |
1542 | source_offset = 7 - source_offset % 8; | |
d3b1e874 TT |
1543 | } |
1544 | else | |
1545 | { | |
22347e55 AA |
1546 | dest += dest_offset / 8; |
1547 | dest_offset %= 8; | |
1548 | source += source_offset / 8; | |
1549 | source_offset %= 8; | |
d3b1e874 TT |
1550 | } |
1551 | ||
22347e55 AA |
1552 | /* Fill BUF with DEST_OFFSET bits from the destination and 8 - |
1553 | SOURCE_OFFSET bits from the source. */ | |
1554 | buf = *(bits_big_endian ? source-- : source++) >> source_offset; | |
1555 | buf <<= dest_offset; | |
1556 | buf |= *dest & ((1 << dest_offset) - 1); | |
d3b1e874 | 1557 | |
22347e55 AA |
1558 | /* NBITS: bits yet to be written; AVAIL: BUF's fill level. */ |
1559 | nbits += dest_offset; | |
1560 | avail = dest_offset + 8 - source_offset; | |
d3b1e874 | 1561 | |
22347e55 AA |
1562 | /* Flush 8 bits from BUF, if appropriate. */ |
1563 | if (nbits >= 8 && avail >= 8) | |
d3b1e874 | 1564 | { |
22347e55 AA |
1565 | *(bits_big_endian ? dest-- : dest++) = buf; |
1566 | buf >>= 8; | |
1567 | avail -= 8; | |
1568 | nbits -= 8; | |
d3b1e874 TT |
1569 | } |
1570 | ||
22347e55 AA |
1571 | /* Copy the middle part. */ |
1572 | if (nbits >= 8) | |
d3b1e874 | 1573 | { |
22347e55 AA |
1574 | size_t len = nbits / 8; |
1575 | ||
793c128d AA |
1576 | /* Use a faster method for byte-aligned copies. */ |
1577 | if (avail == 0) | |
22347e55 | 1578 | { |
793c128d AA |
1579 | if (bits_big_endian) |
1580 | { | |
1581 | dest -= len; | |
1582 | source -= len; | |
1583 | memcpy (dest + 1, source + 1, len); | |
1584 | } | |
1585 | else | |
1586 | { | |
1587 | memcpy (dest, source, len); | |
1588 | dest += len; | |
1589 | source += len; | |
1590 | } | |
1591 | } | |
1592 | else | |
1593 | { | |
1594 | while (len--) | |
1595 | { | |
1596 | buf |= *(bits_big_endian ? source-- : source++) << avail; | |
1597 | *(bits_big_endian ? dest-- : dest++) = buf; | |
1598 | buf >>= 8; | |
1599 | } | |
22347e55 AA |
1600 | } |
1601 | nbits %= 8; | |
d3b1e874 TT |
1602 | } |
1603 | ||
22347e55 AA |
1604 | /* Write the last byte. */ |
1605 | if (nbits) | |
d3b1e874 | 1606 | { |
22347e55 AA |
1607 | if (avail < nbits) |
1608 | buf |= *source << avail; | |
1609 | ||
1610 | buf &= (1 << nbits) - 1; | |
1611 | *dest = (*dest & (~0 << nbits)) | buf; | |
d3b1e874 TT |
1612 | } |
1613 | } | |
1614 | ||
ad06383f AA |
1615 | #if GDB_SELF_TEST |
1616 | ||
1617 | namespace selftests { | |
1618 | ||
1619 | /* Helper function for the unit test of copy_bitwise. Convert NBITS bits | |
1620 | out of BITS, starting at OFFS, to the respective '0'/'1'-string. MSB0 | |
1621 | specifies whether to assume big endian bit numbering. Store the | |
1622 | resulting (not null-terminated) string at STR. */ | |
1623 | ||
1624 | static void | |
1625 | bits_to_str (char *str, const gdb_byte *bits, ULONGEST offs, | |
1626 | ULONGEST nbits, int msb0) | |
1627 | { | |
1628 | unsigned int j; | |
1629 | size_t i; | |
1630 | ||
1631 | for (i = offs / 8, j = offs % 8; nbits; i++, j = 0) | |
1632 | { | |
1633 | unsigned int ch = bits[i]; | |
1634 | for (; j < 8 && nbits; j++, nbits--) | |
1635 | *str++ = (ch & (msb0 ? (1 << (7 - j)) : (1 << j))) ? '1' : '0'; | |
1636 | } | |
1637 | } | |
1638 | ||
1639 | /* Check one invocation of copy_bitwise with the given parameters. */ | |
1640 | ||
1641 | static void | |
1642 | check_copy_bitwise (const gdb_byte *dest, unsigned int dest_offset, | |
1643 | const gdb_byte *source, unsigned int source_offset, | |
1644 | unsigned int nbits, int msb0) | |
1645 | { | |
1646 | size_t len = align_up (dest_offset + nbits, 8); | |
1647 | char *expected = (char *) alloca (len + 1); | |
1648 | char *actual = (char *) alloca (len + 1); | |
1649 | gdb_byte *buf = (gdb_byte *) alloca (len / 8); | |
1650 | ||
1651 | /* Compose a '0'/'1'-string that represents the expected result of | |
1652 | copy_bitwise below: | |
1653 | Bits from [0, DEST_OFFSET) are filled from DEST. | |
1654 | Bits from [DEST_OFFSET, DEST_OFFSET + NBITS) are filled from SOURCE. | |
1655 | Bits from [DEST_OFFSET + NBITS, LEN) are filled from DEST. | |
1656 | ||
1657 | E.g., with: | |
1658 | dest_offset: 4 | |
1659 | nbits: 2 | |
1660 | len: 8 | |
1661 | dest: 00000000 | |
1662 | source: 11111111 | |
1663 | ||
1664 | We should end up with: | |
1665 | buf: 00001100 | |
1666 | DDDDSSDD (D=dest, S=source) | |
1667 | */ | |
1668 | bits_to_str (expected, dest, 0, len, msb0); | |
1669 | bits_to_str (expected + dest_offset, source, source_offset, nbits, msb0); | |
1670 | ||
1671 | /* Fill BUF with data from DEST, apply copy_bitwise, and convert the | |
1672 | result to a '0'/'1'-string. */ | |
1673 | memcpy (buf, dest, len / 8); | |
1674 | copy_bitwise (buf, dest_offset, source, source_offset, nbits, msb0); | |
1675 | bits_to_str (actual, buf, 0, len, msb0); | |
1676 | ||
1677 | /* Compare the resulting strings. */ | |
1678 | expected[len] = actual[len] = '\0'; | |
1679 | if (strcmp (expected, actual) != 0) | |
1680 | error (_("copy_bitwise %s != %s (%u+%u -> %u)"), | |
1681 | expected, actual, source_offset, nbits, dest_offset); | |
1682 | } | |
1683 | ||
1684 | /* Unit test for copy_bitwise. */ | |
1685 | ||
1686 | static void | |
1687 | copy_bitwise_tests (void) | |
1688 | { | |
1689 | /* Data to be used as both source and destination buffers. The two | |
1690 | arrays below represent the lsb0- and msb0- encoded versions of the | |
1691 | following bit string, respectively: | |
1692 | 00000000 00011111 11111111 01001000 10100101 11110010 | |
1693 | This pattern is chosen such that it contains: | |
1694 | - constant 0- and 1- chunks of more than a full byte; | |
1695 | - 0/1- and 1/0 transitions on all bit positions within a byte; | |
1696 | - several sufficiently asymmetric bytes. | |
1697 | */ | |
1698 | static const gdb_byte data_lsb0[] = { | |
1699 | 0x00, 0xf8, 0xff, 0x12, 0xa5, 0x4f | |
1700 | }; | |
1701 | static const gdb_byte data_msb0[] = { | |
1702 | 0x00, 0x1f, 0xff, 0x48, 0xa5, 0xf2 | |
1703 | }; | |
1704 | ||
1705 | constexpr size_t data_nbits = 8 * sizeof (data_lsb0); | |
1706 | constexpr unsigned max_nbits = 24; | |
1707 | ||
1708 | /* Try all combinations of: | |
1709 | lsb0/msb0 bit order (using the respective data array) | |
1710 | X [0, MAX_NBITS] copy bit width | |
1711 | X feasible source offsets for the given copy bit width | |
1712 | X feasible destination offsets | |
1713 | */ | |
1714 | for (int msb0 = 0; msb0 < 2; msb0++) | |
1715 | { | |
1716 | const gdb_byte *data = msb0 ? data_msb0 : data_lsb0; | |
1717 | ||
1718 | for (unsigned int nbits = 1; nbits <= max_nbits; nbits++) | |
1719 | { | |
1720 | const unsigned int max_offset = data_nbits - nbits; | |
1721 | ||
1722 | for (unsigned source_offset = 0; | |
1723 | source_offset <= max_offset; | |
1724 | source_offset++) | |
1725 | { | |
1726 | for (unsigned dest_offset = 0; | |
1727 | dest_offset <= max_offset; | |
1728 | dest_offset++) | |
1729 | { | |
1730 | check_copy_bitwise (data + dest_offset / 8, | |
1731 | dest_offset % 8, | |
1732 | data + source_offset / 8, | |
1733 | source_offset % 8, | |
1734 | nbits, msb0); | |
1735 | } | |
1736 | } | |
1737 | } | |
1738 | ||
1739 | /* Special cases: copy all, copy nothing. */ | |
1740 | check_copy_bitwise (data_lsb0, 0, data_msb0, 0, data_nbits, msb0); | |
1741 | check_copy_bitwise (data_msb0, 0, data_lsb0, 0, data_nbits, msb0); | |
1742 | check_copy_bitwise (data, data_nbits - 7, data, 9, 0, msb0); | |
1743 | } | |
1744 | } | |
1745 | ||
1746 | } /* namespace selftests */ | |
1747 | ||
1748 | #endif /* GDB_SELF_TEST */ | |
1749 | ||
03c8af18 AA |
1750 | /* Return the number of bytes overlapping a contiguous chunk of N_BITS |
1751 | bits whose first bit is located at bit offset START. */ | |
1752 | ||
1753 | static size_t | |
1754 | bits_to_bytes (ULONGEST start, ULONGEST n_bits) | |
1755 | { | |
1756 | return (start % 8 + n_bits + 7) / 8; | |
1757 | } | |
1758 | ||
55acdf22 AA |
1759 | /* Read or write a pieced value V. If FROM != NULL, operate in "write |
1760 | mode": copy FROM into the pieces comprising V. If FROM == NULL, | |
1761 | operate in "read mode": fetch the contents of the (lazy) value V by | |
1762 | composing it from its pieces. */ | |
1763 | ||
052b9502 | 1764 | static void |
55acdf22 | 1765 | rw_pieced_value (struct value *v, struct value *from) |
052b9502 NF |
1766 | { |
1767 | int i; | |
359b19bb | 1768 | LONGEST offset = 0, max_offset; |
d3b1e874 | 1769 | ULONGEST bits_to_skip; |
55acdf22 AA |
1770 | gdb_byte *v_contents; |
1771 | const gdb_byte *from_contents; | |
3e43a32a MS |
1772 | struct piece_closure *c |
1773 | = (struct piece_closure *) value_computed_closure (v); | |
d5722aa2 | 1774 | gdb::byte_vector buffer; |
d3b1e874 TT |
1775 | int bits_big_endian |
1776 | = gdbarch_bits_big_endian (get_type_arch (value_type (v))); | |
afd74c5f | 1777 | |
55acdf22 AA |
1778 | if (from != NULL) |
1779 | { | |
1780 | from_contents = value_contents (from); | |
1781 | v_contents = NULL; | |
1782 | } | |
1783 | else | |
1784 | { | |
1785 | if (value_type (v) != value_enclosing_type (v)) | |
1786 | internal_error (__FILE__, __LINE__, | |
1787 | _("Should not be able to create a lazy value with " | |
1788 | "an enclosing type")); | |
1789 | v_contents = value_contents_raw (v); | |
1790 | from_contents = NULL; | |
1791 | } | |
052b9502 | 1792 | |
d3b1e874 | 1793 | bits_to_skip = 8 * value_offset (v); |
0e03807e TT |
1794 | if (value_bitsize (v)) |
1795 | { | |
af547a96 AA |
1796 | bits_to_skip += (8 * value_offset (value_parent (v)) |
1797 | + value_bitpos (v)); | |
55acdf22 AA |
1798 | if (from != NULL |
1799 | && (gdbarch_byte_order (get_type_arch (value_type (from))) | |
1800 | == BFD_ENDIAN_BIG)) | |
1801 | { | |
1802 | /* Use the least significant bits of FROM. */ | |
1803 | max_offset = 8 * TYPE_LENGTH (value_type (from)); | |
1804 | offset = max_offset - value_bitsize (v); | |
1805 | } | |
1806 | else | |
1807 | max_offset = value_bitsize (v); | |
0e03807e TT |
1808 | } |
1809 | else | |
359b19bb | 1810 | max_offset = 8 * TYPE_LENGTH (value_type (v)); |
d3b1e874 | 1811 | |
f236533e | 1812 | /* Advance to the first non-skipped piece. */ |
1e467161 | 1813 | for (i = 0; i < c->pieces.size () && bits_to_skip >= c->pieces[i].size; i++) |
f236533e AA |
1814 | bits_to_skip -= c->pieces[i].size; |
1815 | ||
1e467161 | 1816 | for (; i < c->pieces.size () && offset < max_offset; i++) |
052b9502 NF |
1817 | { |
1818 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
55acdf22 | 1819 | size_t this_size_bits, this_size; |
359b19bb | 1820 | |
f236533e | 1821 | this_size_bits = p->size - bits_to_skip; |
359b19bb AA |
1822 | if (this_size_bits > max_offset - offset) |
1823 | this_size_bits = max_offset - offset; | |
9a619af0 | 1824 | |
cec03d70 | 1825 | switch (p->location) |
052b9502 | 1826 | { |
cec03d70 TT |
1827 | case DWARF_VALUE_REGISTER: |
1828 | { | |
ee40d8d4 | 1829 | struct frame_info *frame = frame_find_by_id (c->frame_id); |
cec03d70 | 1830 | struct gdbarch *arch = get_frame_arch (frame); |
0fde2c53 | 1831 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno); |
03c8af18 | 1832 | ULONGEST reg_bits = 8 * register_size (arch, gdb_regnum); |
0fde2c53 | 1833 | int optim, unavail; |
dcbf108f | 1834 | |
0fde2c53 | 1835 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG |
65d84b76 | 1836 | && p->offset + p->size < reg_bits) |
63b4f126 | 1837 | { |
0fde2c53 | 1838 | /* Big-endian, and we want less than full size. */ |
f236533e | 1839 | bits_to_skip += reg_bits - (p->offset + p->size); |
63b4f126 | 1840 | } |
65d84b76 | 1841 | else |
f236533e | 1842 | bits_to_skip += p->offset; |
65d84b76 | 1843 | |
f236533e | 1844 | this_size = bits_to_bytes (bits_to_skip, this_size_bits); |
d5722aa2 | 1845 | buffer.resize (this_size); |
0fde2c53 | 1846 | |
55acdf22 | 1847 | if (from == NULL) |
63b4f126 | 1848 | { |
55acdf22 AA |
1849 | /* Read mode. */ |
1850 | if (!get_frame_register_bytes (frame, gdb_regnum, | |
1851 | bits_to_skip / 8, | |
1852 | this_size, buffer.data (), | |
1853 | &optim, &unavail)) | |
1854 | { | |
1855 | if (optim) | |
1856 | mark_value_bits_optimized_out (v, offset, | |
1857 | this_size_bits); | |
1858 | if (unavail) | |
1859 | mark_value_bits_unavailable (v, offset, | |
1860 | this_size_bits); | |
1861 | break; | |
1862 | } | |
1863 | ||
1864 | copy_bitwise (v_contents, offset, | |
1865 | buffer.data (), bits_to_skip % 8, | |
1866 | this_size_bits, bits_big_endian); | |
1867 | } | |
1868 | else | |
1869 | { | |
1870 | /* Write mode. */ | |
1871 | if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0) | |
1872 | { | |
1873 | /* Data is copied non-byte-aligned into the register. | |
1874 | Need some bits from original register value. */ | |
1875 | get_frame_register_bytes (frame, gdb_regnum, | |
1876 | bits_to_skip / 8, | |
1877 | this_size, buffer.data (), | |
1878 | &optim, &unavail); | |
1879 | if (optim) | |
1880 | throw_error (OPTIMIZED_OUT_ERROR, | |
1881 | _("Can't do read-modify-write to " | |
1882 | "update bitfield; containing word " | |
1883 | "has been optimized out")); | |
1884 | if (unavail) | |
1885 | throw_error (NOT_AVAILABLE_ERROR, | |
1886 | _("Can't do read-modify-write to " | |
1887 | "update bitfield; containing word " | |
1888 | "is unavailable")); | |
1889 | } | |
1890 | ||
1891 | copy_bitwise (buffer.data (), bits_to_skip % 8, | |
1892 | from_contents, offset, | |
1893 | this_size_bits, bits_big_endian); | |
1894 | put_frame_register_bytes (frame, gdb_regnum, | |
1895 | bits_to_skip / 8, | |
1896 | this_size, buffer.data ()); | |
63b4f126 | 1897 | } |
cec03d70 TT |
1898 | } |
1899 | break; | |
1900 | ||
1901 | case DWARF_VALUE_MEMORY: | |
55acdf22 AA |
1902 | { |
1903 | bits_to_skip += p->offset; | |
1904 | ||
1905 | CORE_ADDR start_addr = p->v.mem.addr + bits_to_skip / 8; | |
1906 | ||
1907 | if (bits_to_skip % 8 == 0 && this_size_bits % 8 == 0 | |
1908 | && offset % 8 == 0) | |
1909 | { | |
1910 | /* Everything is byte-aligned; no buffer needed. */ | |
1911 | if (from != NULL) | |
1912 | write_memory_with_notification (start_addr, | |
1913 | (from_contents | |
1914 | + offset / 8), | |
1915 | this_size_bits / 8); | |
1916 | else | |
1917 | read_value_memory (v, offset, | |
1918 | p->v.mem.in_stack_memory, | |
1919 | p->v.mem.addr + bits_to_skip / 8, | |
1920 | v_contents + offset / 8, | |
1921 | this_size_bits / 8); | |
1922 | break; | |
1923 | } | |
1924 | ||
1925 | this_size = bits_to_bytes (bits_to_skip, this_size_bits); | |
d5722aa2 | 1926 | buffer.resize (this_size); |
55acdf22 AA |
1927 | |
1928 | if (from == NULL) | |
1929 | { | |
1930 | /* Read mode. */ | |
1931 | read_value_memory (v, offset, | |
1932 | p->v.mem.in_stack_memory, | |
1933 | p->v.mem.addr + bits_to_skip / 8, | |
1934 | buffer.data (), this_size); | |
1935 | copy_bitwise (v_contents, offset, | |
1936 | buffer.data (), bits_to_skip % 8, | |
1937 | this_size_bits, bits_big_endian); | |
1938 | } | |
1939 | else | |
1940 | { | |
1941 | /* Write mode. */ | |
1942 | if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0) | |
1943 | { | |
1944 | if (this_size <= 8) | |
1945 | { | |
1946 | /* Perform a single read for small sizes. */ | |
1947 | read_memory (start_addr, buffer.data (), | |
1948 | this_size); | |
1949 | } | |
1950 | else | |
1951 | { | |
1952 | /* Only the first and last bytes can possibly have | |
1953 | any bits reused. */ | |
1954 | read_memory (start_addr, buffer.data (), 1); | |
1955 | read_memory (start_addr + this_size - 1, | |
1956 | &buffer[this_size - 1], 1); | |
1957 | } | |
1958 | } | |
1959 | ||
1960 | copy_bitwise (buffer.data (), bits_to_skip % 8, | |
1961 | from_contents, offset, | |
1962 | this_size_bits, bits_big_endian); | |
1963 | write_memory_with_notification (start_addr, | |
1964 | buffer.data (), | |
1965 | this_size); | |
1966 | } | |
1967 | } | |
cec03d70 TT |
1968 | break; |
1969 | ||
1970 | case DWARF_VALUE_STACK: | |
1971 | { | |
55acdf22 AA |
1972 | if (from != NULL) |
1973 | { | |
1974 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1975 | break; | |
1976 | } | |
1977 | ||
e9352324 AA |
1978 | struct objfile *objfile = dwarf2_per_cu_objfile (c->per_cu); |
1979 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
1980 | ULONGEST stack_value_size_bits | |
1981 | = 8 * TYPE_LENGTH (value_type (p->v.value)); | |
1982 | ||
1983 | /* Use zeroes if piece reaches beyond stack value. */ | |
65d84b76 | 1984 | if (p->offset + p->size > stack_value_size_bits) |
e9352324 AA |
1985 | break; |
1986 | ||
1987 | /* Piece is anchored at least significant bit end. */ | |
1988 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
f236533e | 1989 | bits_to_skip += stack_value_size_bits - p->offset - p->size; |
65d84b76 | 1990 | else |
f236533e | 1991 | bits_to_skip += p->offset; |
e9352324 | 1992 | |
55acdf22 | 1993 | copy_bitwise (v_contents, offset, |
e9352324 | 1994 | value_contents_all (p->v.value), |
f236533e | 1995 | bits_to_skip, |
e9352324 | 1996 | this_size_bits, bits_big_endian); |
cec03d70 TT |
1997 | } |
1998 | break; | |
1999 | ||
2000 | case DWARF_VALUE_LITERAL: | |
2001 | { | |
55acdf22 AA |
2002 | if (from != NULL) |
2003 | { | |
2004 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
2005 | break; | |
2006 | } | |
2007 | ||
242d31ab AA |
2008 | ULONGEST literal_size_bits = 8 * p->v.literal.length; |
2009 | size_t n = this_size_bits; | |
afd74c5f | 2010 | |
242d31ab | 2011 | /* Cut off at the end of the implicit value. */ |
f236533e AA |
2012 | bits_to_skip += p->offset; |
2013 | if (bits_to_skip >= literal_size_bits) | |
242d31ab | 2014 | break; |
f236533e AA |
2015 | if (n > literal_size_bits - bits_to_skip) |
2016 | n = literal_size_bits - bits_to_skip; | |
e9352324 | 2017 | |
55acdf22 | 2018 | copy_bitwise (v_contents, offset, |
f236533e | 2019 | p->v.literal.data, bits_to_skip, |
242d31ab | 2020 | n, bits_big_endian); |
cec03d70 TT |
2021 | } |
2022 | break; | |
2023 | ||
8cf6f0b1 | 2024 | case DWARF_VALUE_IMPLICIT_POINTER: |
55acdf22 AA |
2025 | if (from != NULL) |
2026 | { | |
2027 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
2028 | break; | |
2029 | } | |
2030 | ||
2031 | /* These bits show up as zeros -- but do not cause the value to | |
2032 | be considered optimized-out. */ | |
8cf6f0b1 TT |
2033 | break; |
2034 | ||
cb826367 | 2035 | case DWARF_VALUE_OPTIMIZED_OUT: |
9a0dc9e3 | 2036 | mark_value_bits_optimized_out (v, offset, this_size_bits); |
cb826367 TT |
2037 | break; |
2038 | ||
cec03d70 TT |
2039 | default: |
2040 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
052b9502 | 2041 | } |
d3b1e874 | 2042 | |
d3b1e874 | 2043 | offset += this_size_bits; |
f236533e | 2044 | bits_to_skip = 0; |
052b9502 NF |
2045 | } |
2046 | } | |
2047 | ||
55acdf22 | 2048 | |
052b9502 | 2049 | static void |
55acdf22 | 2050 | read_pieced_value (struct value *v) |
052b9502 | 2051 | { |
55acdf22 AA |
2052 | rw_pieced_value (v, NULL); |
2053 | } | |
242d31ab | 2054 | |
55acdf22 AA |
2055 | static void |
2056 | write_pieced_value (struct value *to, struct value *from) | |
2057 | { | |
2058 | rw_pieced_value (to, from); | |
052b9502 NF |
2059 | } |
2060 | ||
9a0dc9e3 PA |
2061 | /* An implementation of an lval_funcs method to see whether a value is |
2062 | a synthetic pointer. */ | |
8cf6f0b1 | 2063 | |
0e03807e | 2064 | static int |
6b850546 | 2065 | check_pieced_synthetic_pointer (const struct value *value, LONGEST bit_offset, |
9a0dc9e3 | 2066 | int bit_length) |
0e03807e TT |
2067 | { |
2068 | struct piece_closure *c | |
2069 | = (struct piece_closure *) value_computed_closure (value); | |
2070 | int i; | |
2071 | ||
2072 | bit_offset += 8 * value_offset (value); | |
2073 | if (value_bitsize (value)) | |
2074 | bit_offset += value_bitpos (value); | |
2075 | ||
1e467161 | 2076 | for (i = 0; i < c->pieces.size () && bit_length > 0; i++) |
0e03807e TT |
2077 | { |
2078 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2079 | size_t this_size_bits = p->size; | |
2080 | ||
2081 | if (bit_offset > 0) | |
2082 | { | |
2083 | if (bit_offset >= this_size_bits) | |
2084 | { | |
2085 | bit_offset -= this_size_bits; | |
2086 | continue; | |
2087 | } | |
2088 | ||
2089 | bit_length -= this_size_bits - bit_offset; | |
2090 | bit_offset = 0; | |
2091 | } | |
2092 | else | |
2093 | bit_length -= this_size_bits; | |
2094 | ||
9a0dc9e3 PA |
2095 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) |
2096 | return 0; | |
0e03807e TT |
2097 | } |
2098 | ||
9a0dc9e3 | 2099 | return 1; |
8cf6f0b1 TT |
2100 | } |
2101 | ||
2102 | /* A wrapper function for get_frame_address_in_block. */ | |
2103 | ||
2104 | static CORE_ADDR | |
2105 | get_frame_address_in_block_wrapper (void *baton) | |
2106 | { | |
9a3c8263 | 2107 | return get_frame_address_in_block ((struct frame_info *) baton); |
8cf6f0b1 TT |
2108 | } |
2109 | ||
3326303b MG |
2110 | /* Fetch a DW_AT_const_value through a synthetic pointer. */ |
2111 | ||
2112 | static struct value * | |
2113 | fetch_const_value_from_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
2114 | struct dwarf2_per_cu_data *per_cu, | |
2115 | struct type *type) | |
2116 | { | |
2117 | struct value *result = NULL; | |
3326303b MG |
2118 | const gdb_byte *bytes; |
2119 | LONGEST len; | |
2120 | ||
8268c778 | 2121 | auto_obstack temp_obstack; |
3326303b MG |
2122 | bytes = dwarf2_fetch_constant_bytes (die, per_cu, &temp_obstack, &len); |
2123 | ||
2124 | if (bytes != NULL) | |
2125 | { | |
2126 | if (byte_offset >= 0 | |
2127 | && byte_offset + TYPE_LENGTH (TYPE_TARGET_TYPE (type)) <= len) | |
2128 | { | |
2129 | bytes += byte_offset; | |
2130 | result = value_from_contents (TYPE_TARGET_TYPE (type), bytes); | |
2131 | } | |
2132 | else | |
2133 | invalid_synthetic_pointer (); | |
2134 | } | |
2135 | else | |
2136 | result = allocate_optimized_out_value (TYPE_TARGET_TYPE (type)); | |
2137 | ||
3326303b MG |
2138 | return result; |
2139 | } | |
2140 | ||
2141 | /* Fetch the value pointed to by a synthetic pointer. */ | |
2142 | ||
2143 | static struct value * | |
2144 | indirect_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
2145 | struct dwarf2_per_cu_data *per_cu, | |
2146 | struct frame_info *frame, struct type *type) | |
2147 | { | |
2148 | /* Fetch the location expression of the DIE we're pointing to. */ | |
2149 | struct dwarf2_locexpr_baton baton | |
2150 | = dwarf2_fetch_die_loc_sect_off (die, per_cu, | |
2151 | get_frame_address_in_block_wrapper, frame); | |
2152 | ||
7942e96e AA |
2153 | /* Get type of pointed-to DIE. */ |
2154 | struct type *orig_type = dwarf2_fetch_die_type_sect_off (die, per_cu); | |
2155 | if (orig_type == NULL) | |
2156 | invalid_synthetic_pointer (); | |
2157 | ||
3326303b MG |
2158 | /* If pointed-to DIE has a DW_AT_location, evaluate it and return the |
2159 | resulting value. Otherwise, it may have a DW_AT_const_value instead, | |
2160 | or it may've been optimized out. */ | |
2161 | if (baton.data != NULL) | |
7942e96e AA |
2162 | return dwarf2_evaluate_loc_desc_full (orig_type, frame, baton.data, |
2163 | baton.size, baton.per_cu, | |
2164 | TYPE_TARGET_TYPE (type), | |
3326303b MG |
2165 | byte_offset); |
2166 | else | |
2167 | return fetch_const_value_from_synthetic_pointer (die, byte_offset, per_cu, | |
2168 | type); | |
2169 | } | |
2170 | ||
8cf6f0b1 TT |
2171 | /* An implementation of an lval_funcs method to indirect through a |
2172 | pointer. This handles the synthetic pointer case when needed. */ | |
2173 | ||
2174 | static struct value * | |
2175 | indirect_pieced_value (struct value *value) | |
2176 | { | |
2177 | struct piece_closure *c | |
2178 | = (struct piece_closure *) value_computed_closure (value); | |
2179 | struct type *type; | |
2180 | struct frame_info *frame; | |
6b850546 DT |
2181 | int i, bit_length; |
2182 | LONGEST bit_offset; | |
8cf6f0b1 | 2183 | struct dwarf_expr_piece *piece = NULL; |
8cf6f0b1 | 2184 | LONGEST byte_offset; |
b597c318 | 2185 | enum bfd_endian byte_order; |
8cf6f0b1 | 2186 | |
0e37a63c | 2187 | type = check_typedef (value_type (value)); |
8cf6f0b1 TT |
2188 | if (TYPE_CODE (type) != TYPE_CODE_PTR) |
2189 | return NULL; | |
2190 | ||
2191 | bit_length = 8 * TYPE_LENGTH (type); | |
2192 | bit_offset = 8 * value_offset (value); | |
2193 | if (value_bitsize (value)) | |
2194 | bit_offset += value_bitpos (value); | |
2195 | ||
1e467161 | 2196 | for (i = 0; i < c->pieces.size () && bit_length > 0; i++) |
8cf6f0b1 TT |
2197 | { |
2198 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2199 | size_t this_size_bits = p->size; | |
2200 | ||
2201 | if (bit_offset > 0) | |
2202 | { | |
2203 | if (bit_offset >= this_size_bits) | |
2204 | { | |
2205 | bit_offset -= this_size_bits; | |
2206 | continue; | |
2207 | } | |
2208 | ||
2209 | bit_length -= this_size_bits - bit_offset; | |
2210 | bit_offset = 0; | |
2211 | } | |
2212 | else | |
2213 | bit_length -= this_size_bits; | |
2214 | ||
2215 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
2216 | return NULL; | |
2217 | ||
2218 | if (bit_length != 0) | |
216f72a1 | 2219 | error (_("Invalid use of DW_OP_implicit_pointer")); |
8cf6f0b1 TT |
2220 | |
2221 | piece = p; | |
2222 | break; | |
2223 | } | |
2224 | ||
3326303b | 2225 | gdb_assert (piece != NULL); |
8cf6f0b1 | 2226 | frame = get_selected_frame (_("No frame selected.")); |
543305c9 | 2227 | |
5bd1ef56 TT |
2228 | /* This is an offset requested by GDB, such as value subscripts. |
2229 | However, due to how synthetic pointers are implemented, this is | |
2230 | always presented to us as a pointer type. This means we have to | |
b597c318 YQ |
2231 | sign-extend it manually as appropriate. Use raw |
2232 | extract_signed_integer directly rather than value_as_address and | |
2233 | sign extend afterwards on architectures that would need it | |
2234 | (mostly everywhere except MIPS, which has signed addresses) as | |
2235 | the later would go through gdbarch_pointer_to_address and thus | |
2236 | return a CORE_ADDR with high bits set on architectures that | |
2237 | encode address spaces and other things in CORE_ADDR. */ | |
2238 | byte_order = gdbarch_byte_order (get_frame_arch (frame)); | |
2239 | byte_offset = extract_signed_integer (value_contents (value), | |
2240 | TYPE_LENGTH (type), byte_order); | |
5bd1ef56 | 2241 | byte_offset += piece->v.ptr.offset; |
8cf6f0b1 | 2242 | |
9c541725 PA |
2243 | return indirect_synthetic_pointer (piece->v.ptr.die_sect_off, |
2244 | byte_offset, c->per_cu, | |
3326303b MG |
2245 | frame, type); |
2246 | } | |
8cf6f0b1 | 2247 | |
3326303b MG |
2248 | /* Implementation of the coerce_ref method of lval_funcs for synthetic C++ |
2249 | references. */ | |
b6807d98 | 2250 | |
3326303b MG |
2251 | static struct value * |
2252 | coerce_pieced_ref (const struct value *value) | |
2253 | { | |
2254 | struct type *type = check_typedef (value_type (value)); | |
b6807d98 | 2255 | |
3326303b MG |
2256 | if (value_bits_synthetic_pointer (value, value_embedded_offset (value), |
2257 | TARGET_CHAR_BIT * TYPE_LENGTH (type))) | |
2258 | { | |
2259 | const struct piece_closure *closure | |
2260 | = (struct piece_closure *) value_computed_closure (value); | |
2261 | struct frame_info *frame | |
2262 | = get_selected_frame (_("No frame selected.")); | |
2263 | ||
2264 | /* gdb represents synthetic pointers as pieced values with a single | |
2265 | piece. */ | |
2266 | gdb_assert (closure != NULL); | |
1e467161 | 2267 | gdb_assert (closure->pieces.size () == 1); |
3326303b | 2268 | |
1e467161 SM |
2269 | return indirect_synthetic_pointer |
2270 | (closure->pieces[0].v.ptr.die_sect_off, | |
2271 | closure->pieces[0].v.ptr.offset, | |
2272 | closure->per_cu, frame, type); | |
3326303b MG |
2273 | } |
2274 | else | |
2275 | { | |
2276 | /* Else: not a synthetic reference; do nothing. */ | |
2277 | return NULL; | |
2278 | } | |
0e03807e TT |
2279 | } |
2280 | ||
052b9502 | 2281 | static void * |
0e03807e | 2282 | copy_pieced_value_closure (const struct value *v) |
052b9502 | 2283 | { |
3e43a32a MS |
2284 | struct piece_closure *c |
2285 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2286 | |
88bfdde4 TT |
2287 | ++c->refc; |
2288 | return c; | |
052b9502 NF |
2289 | } |
2290 | ||
2291 | static void | |
2292 | free_pieced_value_closure (struct value *v) | |
2293 | { | |
3e43a32a MS |
2294 | struct piece_closure *c |
2295 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2296 | |
88bfdde4 TT |
2297 | --c->refc; |
2298 | if (c->refc == 0) | |
2299 | { | |
1e467161 SM |
2300 | for (dwarf_expr_piece &p : c->pieces) |
2301 | if (p.location == DWARF_VALUE_STACK) | |
2302 | value_free (p.v.value); | |
8a9b8146 | 2303 | |
1e467161 | 2304 | delete c; |
88bfdde4 | 2305 | } |
052b9502 NF |
2306 | } |
2307 | ||
2308 | /* Functions for accessing a variable described by DW_OP_piece. */ | |
c8f2448a | 2309 | static const struct lval_funcs pieced_value_funcs = { |
052b9502 NF |
2310 | read_pieced_value, |
2311 | write_pieced_value, | |
8cf6f0b1 | 2312 | indirect_pieced_value, |
3326303b | 2313 | coerce_pieced_ref, |
8cf6f0b1 | 2314 | check_pieced_synthetic_pointer, |
052b9502 NF |
2315 | copy_pieced_value_closure, |
2316 | free_pieced_value_closure | |
2317 | }; | |
2318 | ||
4c2df51b | 2319 | /* Evaluate a location description, starting at DATA and with length |
8cf6f0b1 | 2320 | SIZE, to find the current location of variable of TYPE in the |
7942e96e AA |
2321 | context of FRAME. If SUBOBJ_TYPE is non-NULL, return instead the |
2322 | location of the subobject of type SUBOBJ_TYPE at byte offset | |
2323 | SUBOBJ_BYTE_OFFSET within the variable of type TYPE. */ | |
a2d33775 | 2324 | |
8cf6f0b1 TT |
2325 | static struct value * |
2326 | dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame, | |
56eb65bd | 2327 | const gdb_byte *data, size_t size, |
8cf6f0b1 | 2328 | struct dwarf2_per_cu_data *per_cu, |
7942e96e AA |
2329 | struct type *subobj_type, |
2330 | LONGEST subobj_byte_offset) | |
4c2df51b | 2331 | { |
4c2df51b | 2332 | struct value *retval; |
ac56253d | 2333 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b | 2334 | |
7942e96e AA |
2335 | if (subobj_type == NULL) |
2336 | { | |
2337 | subobj_type = type; | |
2338 | subobj_byte_offset = 0; | |
2339 | } | |
2340 | else if (subobj_byte_offset < 0) | |
8cf6f0b1 TT |
2341 | invalid_synthetic_pointer (); |
2342 | ||
0d53c4c4 | 2343 | if (size == 0) |
7942e96e | 2344 | return allocate_optimized_out_value (subobj_type); |
0d53c4c4 | 2345 | |
192ca6d8 TT |
2346 | dwarf_evaluate_loc_desc ctx; |
2347 | ctx.frame = frame; | |
2348 | ctx.per_cu = per_cu; | |
2349 | ctx.obj_address = 0; | |
4c2df51b | 2350 | |
0cf08227 | 2351 | scoped_value_mark free_values; |
4a227398 | 2352 | |
718b9626 TT |
2353 | ctx.gdbarch = get_objfile_arch (objfile); |
2354 | ctx.addr_size = dwarf2_per_cu_addr_size (per_cu); | |
2355 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); | |
2356 | ctx.offset = dwarf2_per_cu_text_offset (per_cu); | |
4c2df51b | 2357 | |
492d29ea | 2358 | TRY |
79e1a869 | 2359 | { |
595d2e30 | 2360 | ctx.eval (data, size); |
79e1a869 | 2361 | } |
492d29ea | 2362 | CATCH (ex, RETURN_MASK_ERROR) |
79e1a869 PA |
2363 | { |
2364 | if (ex.error == NOT_AVAILABLE_ERROR) | |
2365 | { | |
0cf08227 | 2366 | free_values.free_to_mark (); |
7942e96e AA |
2367 | retval = allocate_value (subobj_type); |
2368 | mark_value_bytes_unavailable (retval, 0, | |
2369 | TYPE_LENGTH (subobj_type)); | |
79e1a869 PA |
2370 | return retval; |
2371 | } | |
8e3b41a9 JK |
2372 | else if (ex.error == NO_ENTRY_VALUE_ERROR) |
2373 | { | |
2374 | if (entry_values_debug) | |
2375 | exception_print (gdb_stdout, ex); | |
0cf08227 | 2376 | free_values.free_to_mark (); |
7942e96e | 2377 | return allocate_optimized_out_value (subobj_type); |
8e3b41a9 | 2378 | } |
79e1a869 PA |
2379 | else |
2380 | throw_exception (ex); | |
2381 | } | |
492d29ea | 2382 | END_CATCH |
79e1a869 | 2383 | |
1e467161 | 2384 | if (ctx.pieces.size () > 0) |
87808bd6 | 2385 | { |
052b9502 | 2386 | struct piece_closure *c; |
8cf6f0b1 | 2387 | ULONGEST bit_size = 0; |
052b9502 | 2388 | |
1e467161 SM |
2389 | for (dwarf_expr_piece &piece : ctx.pieces) |
2390 | bit_size += piece.size; | |
03278692 TT |
2391 | /* Complain if the expression is larger than the size of the |
2392 | outer type. */ | |
2393 | if (bit_size > 8 * TYPE_LENGTH (type)) | |
8cf6f0b1 TT |
2394 | invalid_synthetic_pointer (); |
2395 | ||
1e467161 | 2396 | c = allocate_piece_closure (per_cu, std::move (ctx.pieces), frame); |
72fc29ff TT |
2397 | /* We must clean up the value chain after creating the piece |
2398 | closure but before allocating the result. */ | |
0cf08227 | 2399 | free_values.free_to_mark (); |
7942e96e AA |
2400 | retval = allocate_computed_value (subobj_type, |
2401 | &pieced_value_funcs, c); | |
2402 | set_value_offset (retval, subobj_byte_offset); | |
87808bd6 | 2403 | } |
4c2df51b DJ |
2404 | else |
2405 | { | |
718b9626 | 2406 | switch (ctx.location) |
cec03d70 TT |
2407 | { |
2408 | case DWARF_VALUE_REGISTER: | |
2409 | { | |
2410 | struct gdbarch *arch = get_frame_arch (frame); | |
7c33b57c | 2411 | int dwarf_regnum |
595d2e30 | 2412 | = longest_to_int (value_as_long (ctx.fetch (0))); |
0fde2c53 | 2413 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, dwarf_regnum); |
9a619af0 | 2414 | |
7942e96e | 2415 | if (subobj_byte_offset != 0) |
8cf6f0b1 | 2416 | error (_("cannot use offset on synthetic pointer to register")); |
0cf08227 | 2417 | free_values.free_to_mark (); |
7942e96e | 2418 | retval = value_from_register (subobj_type, gdb_regnum, frame); |
0fde2c53 DE |
2419 | if (value_optimized_out (retval)) |
2420 | { | |
2421 | struct value *tmp; | |
2422 | ||
2423 | /* This means the register has undefined value / was | |
2424 | not saved. As we're computing the location of some | |
2425 | variable etc. in the program, not a value for | |
2426 | inspecting a register ($pc, $sp, etc.), return a | |
2427 | generic optimized out value instead, so that we show | |
2428 | <optimized out> instead of <not saved>. */ | |
7942e96e AA |
2429 | tmp = allocate_value (subobj_type); |
2430 | value_contents_copy (tmp, 0, retval, 0, | |
2431 | TYPE_LENGTH (subobj_type)); | |
0fde2c53 DE |
2432 | retval = tmp; |
2433 | } | |
cec03d70 TT |
2434 | } |
2435 | break; | |
2436 | ||
2437 | case DWARF_VALUE_MEMORY: | |
2438 | { | |
f56331b4 | 2439 | struct type *ptr_type; |
595d2e30 | 2440 | CORE_ADDR address = ctx.fetch_address (0); |
69009882 | 2441 | bool in_stack_memory = ctx.fetch_in_stack_memory (0); |
cec03d70 | 2442 | |
f56331b4 KB |
2443 | /* DW_OP_deref_size (and possibly other operations too) may |
2444 | create a pointer instead of an address. Ideally, the | |
2445 | pointer to address conversion would be performed as part | |
2446 | of those operations, but the type of the object to | |
2447 | which the address refers is not known at the time of | |
2448 | the operation. Therefore, we do the conversion here | |
2449 | since the type is readily available. */ | |
2450 | ||
7942e96e | 2451 | switch (TYPE_CODE (subobj_type)) |
f56331b4 KB |
2452 | { |
2453 | case TYPE_CODE_FUNC: | |
2454 | case TYPE_CODE_METHOD: | |
718b9626 | 2455 | ptr_type = builtin_type (ctx.gdbarch)->builtin_func_ptr; |
f56331b4 KB |
2456 | break; |
2457 | default: | |
718b9626 | 2458 | ptr_type = builtin_type (ctx.gdbarch)->builtin_data_ptr; |
f56331b4 KB |
2459 | break; |
2460 | } | |
2461 | address = value_as_address (value_from_pointer (ptr_type, address)); | |
2462 | ||
0cf08227 | 2463 | free_values.free_to_mark (); |
7942e96e AA |
2464 | retval = value_at_lazy (subobj_type, |
2465 | address + subobj_byte_offset); | |
44353522 DE |
2466 | if (in_stack_memory) |
2467 | set_value_stack (retval, 1); | |
cec03d70 TT |
2468 | } |
2469 | break; | |
2470 | ||
2471 | case DWARF_VALUE_STACK: | |
2472 | { | |
595d2e30 | 2473 | struct value *value = ctx.fetch (0); |
8a9b8146 | 2474 | size_t n = TYPE_LENGTH (value_type (value)); |
7942e96e AA |
2475 | size_t len = TYPE_LENGTH (subobj_type); |
2476 | size_t max = TYPE_LENGTH (type); | |
2477 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
cec03d70 | 2478 | |
7942e96e | 2479 | if (subobj_byte_offset + len > max) |
8cf6f0b1 TT |
2480 | invalid_synthetic_pointer (); |
2481 | ||
72fc29ff TT |
2482 | /* Preserve VALUE because we are going to free values back |
2483 | to the mark, but we still need the value contents | |
2484 | below. */ | |
2485 | value_incref (value); | |
0cf08227 | 2486 | free_values.free_to_mark (); |
757325a3 | 2487 | gdb_value_up value_holder (value); |
72fc29ff | 2488 | |
7942e96e | 2489 | retval = allocate_value (subobj_type); |
b6cede78 | 2490 | |
7942e96e AA |
2491 | /* The given offset is relative to the actual object. */ |
2492 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2493 | subobj_byte_offset += n - max; | |
2494 | ||
2495 | memcpy (value_contents_raw (retval), | |
2496 | value_contents_all (value) + subobj_byte_offset, len); | |
cec03d70 TT |
2497 | } |
2498 | break; | |
2499 | ||
2500 | case DWARF_VALUE_LITERAL: | |
2501 | { | |
2502 | bfd_byte *contents; | |
7942e96e | 2503 | size_t n = TYPE_LENGTH (subobj_type); |
cec03d70 | 2504 | |
7942e96e | 2505 | if (subobj_byte_offset + n > ctx.len) |
8cf6f0b1 TT |
2506 | invalid_synthetic_pointer (); |
2507 | ||
0cf08227 | 2508 | free_values.free_to_mark (); |
7942e96e | 2509 | retval = allocate_value (subobj_type); |
cec03d70 | 2510 | contents = value_contents_raw (retval); |
7942e96e | 2511 | memcpy (contents, ctx.data + subobj_byte_offset, n); |
cec03d70 TT |
2512 | } |
2513 | break; | |
2514 | ||
dd90784c | 2515 | case DWARF_VALUE_OPTIMIZED_OUT: |
0cf08227 | 2516 | free_values.free_to_mark (); |
7942e96e | 2517 | retval = allocate_optimized_out_value (subobj_type); |
dd90784c JK |
2518 | break; |
2519 | ||
8cf6f0b1 TT |
2520 | /* DWARF_VALUE_IMPLICIT_POINTER was converted to a pieced |
2521 | operation by execute_stack_op. */ | |
2522 | case DWARF_VALUE_IMPLICIT_POINTER: | |
cb826367 TT |
2523 | /* DWARF_VALUE_OPTIMIZED_OUT can't occur in this context -- |
2524 | it can only be encountered when making a piece. */ | |
cec03d70 TT |
2525 | default: |
2526 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
2527 | } | |
4c2df51b DJ |
2528 | } |
2529 | ||
718b9626 | 2530 | set_value_initialized (retval, ctx.initialized); |
42be36b3 | 2531 | |
4c2df51b DJ |
2532 | return retval; |
2533 | } | |
8cf6f0b1 TT |
2534 | |
2535 | /* The exported interface to dwarf2_evaluate_loc_desc_full; it always | |
2536 | passes 0 as the byte_offset. */ | |
2537 | ||
2538 | struct value * | |
2539 | dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame, | |
56eb65bd | 2540 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2541 | struct dwarf2_per_cu_data *per_cu) |
2542 | { | |
7942e96e AA |
2543 | return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, |
2544 | NULL, 0); | |
8cf6f0b1 TT |
2545 | } |
2546 | ||
80180f79 | 2547 | /* Evaluates a dwarf expression and stores the result in VAL, expecting |
63e43d3a PMR |
2548 | that the dwarf expression only produces a single CORE_ADDR. FRAME is the |
2549 | frame in which the expression is evaluated. ADDR is a context (location of | |
2550 | a variable) and might be needed to evaluate the location expression. | |
80180f79 SA |
2551 | Returns 1 on success, 0 otherwise. */ |
2552 | ||
2553 | static int | |
2554 | dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton, | |
63e43d3a | 2555 | struct frame_info *frame, |
08412b07 | 2556 | CORE_ADDR addr, |
1cfdf534 | 2557 | CORE_ADDR *valp) |
80180f79 | 2558 | { |
80180f79 | 2559 | struct objfile *objfile; |
80180f79 SA |
2560 | |
2561 | if (dlbaton == NULL || dlbaton->size == 0) | |
2562 | return 0; | |
2563 | ||
192ca6d8 | 2564 | dwarf_evaluate_loc_desc ctx; |
80180f79 | 2565 | |
192ca6d8 TT |
2566 | ctx.frame = frame; |
2567 | ctx.per_cu = dlbaton->per_cu; | |
2568 | ctx.obj_address = addr; | |
80180f79 SA |
2569 | |
2570 | objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); | |
2571 | ||
718b9626 TT |
2572 | ctx.gdbarch = get_objfile_arch (objfile); |
2573 | ctx.addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
2574 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (dlbaton->per_cu); | |
2575 | ctx.offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); | |
80180f79 | 2576 | |
595d2e30 | 2577 | ctx.eval (dlbaton->data, dlbaton->size); |
80180f79 | 2578 | |
718b9626 | 2579 | switch (ctx.location) |
80180f79 SA |
2580 | { |
2581 | case DWARF_VALUE_REGISTER: | |
2582 | case DWARF_VALUE_MEMORY: | |
2583 | case DWARF_VALUE_STACK: | |
595d2e30 | 2584 | *valp = ctx.fetch_address (0); |
718b9626 | 2585 | if (ctx.location == DWARF_VALUE_REGISTER) |
192ca6d8 | 2586 | *valp = ctx.read_addr_from_reg (*valp); |
80180f79 SA |
2587 | return 1; |
2588 | case DWARF_VALUE_LITERAL: | |
718b9626 TT |
2589 | *valp = extract_signed_integer (ctx.data, ctx.len, |
2590 | gdbarch_byte_order (ctx.gdbarch)); | |
80180f79 SA |
2591 | return 1; |
2592 | /* Unsupported dwarf values. */ | |
2593 | case DWARF_VALUE_OPTIMIZED_OUT: | |
2594 | case DWARF_VALUE_IMPLICIT_POINTER: | |
2595 | break; | |
2596 | } | |
2597 | ||
80180f79 SA |
2598 | return 0; |
2599 | } | |
2600 | ||
2601 | /* See dwarf2loc.h. */ | |
2602 | ||
2603 | int | |
08412b07 | 2604 | dwarf2_evaluate_property (const struct dynamic_prop *prop, |
63e43d3a | 2605 | struct frame_info *frame, |
df25ebbd JB |
2606 | struct property_addr_info *addr_stack, |
2607 | CORE_ADDR *value) | |
80180f79 SA |
2608 | { |
2609 | if (prop == NULL) | |
2610 | return 0; | |
2611 | ||
63e43d3a PMR |
2612 | if (frame == NULL && has_stack_frames ()) |
2613 | frame = get_selected_frame (NULL); | |
2614 | ||
80180f79 SA |
2615 | switch (prop->kind) |
2616 | { | |
2617 | case PROP_LOCEXPR: | |
2618 | { | |
9a3c8263 SM |
2619 | const struct dwarf2_property_baton *baton |
2620 | = (const struct dwarf2_property_baton *) prop->data.baton; | |
80180f79 | 2621 | |
63e43d3a PMR |
2622 | if (dwarf2_locexpr_baton_eval (&baton->locexpr, frame, |
2623 | addr_stack ? addr_stack->addr : 0, | |
df25ebbd | 2624 | value)) |
80180f79 SA |
2625 | { |
2626 | if (baton->referenced_type) | |
2627 | { | |
2628 | struct value *val = value_at (baton->referenced_type, *value); | |
2629 | ||
2630 | *value = value_as_address (val); | |
2631 | } | |
2632 | return 1; | |
2633 | } | |
2634 | } | |
2635 | break; | |
2636 | ||
2637 | case PROP_LOCLIST: | |
2638 | { | |
9a3c8263 SM |
2639 | struct dwarf2_property_baton *baton |
2640 | = (struct dwarf2_property_baton *) prop->data.baton; | |
80180f79 SA |
2641 | CORE_ADDR pc = get_frame_address_in_block (frame); |
2642 | const gdb_byte *data; | |
2643 | struct value *val; | |
2644 | size_t size; | |
2645 | ||
2646 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2647 | if (data != NULL) | |
2648 | { | |
2649 | val = dwarf2_evaluate_loc_desc (baton->referenced_type, frame, data, | |
2650 | size, baton->loclist.per_cu); | |
2651 | if (!value_optimized_out (val)) | |
2652 | { | |
2653 | *value = value_as_address (val); | |
2654 | return 1; | |
2655 | } | |
2656 | } | |
2657 | } | |
2658 | break; | |
2659 | ||
2660 | case PROP_CONST: | |
2661 | *value = prop->data.const_val; | |
2662 | return 1; | |
df25ebbd JB |
2663 | |
2664 | case PROP_ADDR_OFFSET: | |
2665 | { | |
9a3c8263 SM |
2666 | struct dwarf2_property_baton *baton |
2667 | = (struct dwarf2_property_baton *) prop->data.baton; | |
df25ebbd JB |
2668 | struct property_addr_info *pinfo; |
2669 | struct value *val; | |
2670 | ||
2671 | for (pinfo = addr_stack; pinfo != NULL; pinfo = pinfo->next) | |
2672 | if (pinfo->type == baton->referenced_type) | |
2673 | break; | |
2674 | if (pinfo == NULL) | |
2c811c0f | 2675 | error (_("cannot find reference address for offset property")); |
c3345124 JB |
2676 | if (pinfo->valaddr != NULL) |
2677 | val = value_from_contents | |
2678 | (baton->offset_info.type, | |
2679 | pinfo->valaddr + baton->offset_info.offset); | |
2680 | else | |
2681 | val = value_at (baton->offset_info.type, | |
2682 | pinfo->addr + baton->offset_info.offset); | |
df25ebbd JB |
2683 | *value = value_as_address (val); |
2684 | return 1; | |
2685 | } | |
80180f79 SA |
2686 | } |
2687 | ||
2688 | return 0; | |
2689 | } | |
2690 | ||
bb2ec1b3 TT |
2691 | /* See dwarf2loc.h. */ |
2692 | ||
2693 | void | |
d7e74731 | 2694 | dwarf2_compile_property_to_c (string_file &stream, |
bb2ec1b3 TT |
2695 | const char *result_name, |
2696 | struct gdbarch *gdbarch, | |
2697 | unsigned char *registers_used, | |
2698 | const struct dynamic_prop *prop, | |
2699 | CORE_ADDR pc, | |
2700 | struct symbol *sym) | |
2701 | { | |
9a3c8263 SM |
2702 | struct dwarf2_property_baton *baton |
2703 | = (struct dwarf2_property_baton *) prop->data.baton; | |
bb2ec1b3 TT |
2704 | const gdb_byte *data; |
2705 | size_t size; | |
2706 | struct dwarf2_per_cu_data *per_cu; | |
2707 | ||
2708 | if (prop->kind == PROP_LOCEXPR) | |
2709 | { | |
2710 | data = baton->locexpr.data; | |
2711 | size = baton->locexpr.size; | |
2712 | per_cu = baton->locexpr.per_cu; | |
2713 | } | |
2714 | else | |
2715 | { | |
2716 | gdb_assert (prop->kind == PROP_LOCLIST); | |
2717 | ||
2718 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2719 | per_cu = baton->loclist.per_cu; | |
2720 | } | |
2721 | ||
2722 | compile_dwarf_bounds_to_c (stream, result_name, prop, sym, pc, | |
2723 | gdbarch, registers_used, | |
2724 | dwarf2_per_cu_addr_size (per_cu), | |
2725 | data, data + size, per_cu); | |
2726 | } | |
2727 | ||
4c2df51b | 2728 | \f |
0b31a4bc | 2729 | /* Helper functions and baton for dwarf2_loc_desc_get_symbol_read_needs. */ |
4c2df51b | 2730 | |
192ca6d8 | 2731 | class symbol_needs_eval_context : public dwarf_expr_context |
4c2df51b | 2732 | { |
192ca6d8 TT |
2733 | public: |
2734 | ||
0b31a4bc | 2735 | enum symbol_needs_kind needs; |
17ea53c3 | 2736 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b | 2737 | |
192ca6d8 TT |
2738 | /* Reads from registers do require a frame. */ |
2739 | CORE_ADDR read_addr_from_reg (int regnum) OVERRIDE | |
2740 | { | |
2741 | needs = SYMBOL_NEEDS_FRAME; | |
2742 | return 1; | |
2743 | } | |
2744 | ||
2745 | /* "get_reg_value" callback: Reads from registers do require a | |
2746 | frame. */ | |
2747 | ||
2748 | struct value *get_reg_value (struct type *type, int regnum) OVERRIDE | |
2749 | { | |
2750 | needs = SYMBOL_NEEDS_FRAME; | |
2751 | return value_zero (type, not_lval); | |
2752 | } | |
2753 | ||
2754 | /* Reads from memory do not require a frame. */ | |
2755 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE | |
2756 | { | |
2757 | memset (buf, 0, len); | |
2758 | } | |
2759 | ||
2760 | /* Frame-relative accesses do require a frame. */ | |
2761 | void get_frame_base (const gdb_byte **start, size_t *length) OVERRIDE | |
2762 | { | |
2763 | static gdb_byte lit0 = DW_OP_lit0; | |
2764 | ||
2765 | *start = &lit0; | |
2766 | *length = 1; | |
2767 | ||
2768 | needs = SYMBOL_NEEDS_FRAME; | |
2769 | } | |
2770 | ||
2771 | /* CFA accesses require a frame. */ | |
2772 | CORE_ADDR get_frame_cfa () OVERRIDE | |
2773 | { | |
2774 | needs = SYMBOL_NEEDS_FRAME; | |
2775 | return 1; | |
2776 | } | |
2777 | ||
7d5697f9 TT |
2778 | CORE_ADDR get_frame_pc () OVERRIDE |
2779 | { | |
2780 | needs = SYMBOL_NEEDS_FRAME; | |
2781 | return 1; | |
2782 | } | |
2783 | ||
192ca6d8 TT |
2784 | /* Thread-local accesses require registers, but not a frame. */ |
2785 | CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE | |
2786 | { | |
2787 | if (needs <= SYMBOL_NEEDS_REGISTERS) | |
2788 | needs = SYMBOL_NEEDS_REGISTERS; | |
2789 | return 1; | |
2790 | } | |
2791 | ||
2792 | /* Helper interface of per_cu_dwarf_call for | |
2793 | dwarf2_loc_desc_get_symbol_read_needs. */ | |
2794 | ||
2795 | void dwarf_call (cu_offset die_offset) OVERRIDE | |
2796 | { | |
2797 | per_cu_dwarf_call (this, die_offset, per_cu); | |
2798 | } | |
2799 | ||
216f72a1 | 2800 | /* DW_OP_entry_value accesses require a caller, therefore a |
192ca6d8 TT |
2801 | frame. */ |
2802 | ||
2803 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
2804 | union call_site_parameter_u kind_u, | |
2805 | int deref_size) OVERRIDE | |
2806 | { | |
2807 | needs = SYMBOL_NEEDS_FRAME; | |
3019eac3 | 2808 | |
192ca6d8 TT |
2809 | /* The expression may require some stub values on DWARF stack. */ |
2810 | push_address (0, 0); | |
2811 | } | |
3019eac3 | 2812 | |
192ca6d8 | 2813 | /* DW_OP_GNU_addr_index doesn't require a frame. */ |
08412b07 | 2814 | |
192ca6d8 TT |
2815 | CORE_ADDR get_addr_index (unsigned int index) OVERRIDE |
2816 | { | |
2817 | /* Nothing to do. */ | |
2818 | return 1; | |
2819 | } | |
08412b07 | 2820 | |
192ca6d8 | 2821 | /* DW_OP_push_object_address has a frame already passed through. */ |
9e8b7a03 | 2822 | |
192ca6d8 TT |
2823 | CORE_ADDR get_object_address () OVERRIDE |
2824 | { | |
2825 | /* Nothing to do. */ | |
2826 | return 1; | |
2827 | } | |
9e8b7a03 JK |
2828 | }; |
2829 | ||
0b31a4bc TT |
2830 | /* Compute the correct symbol_needs_kind value for the location |
2831 | expression at DATA (length SIZE). */ | |
4c2df51b | 2832 | |
0b31a4bc TT |
2833 | static enum symbol_needs_kind |
2834 | dwarf2_loc_desc_get_symbol_read_needs (const gdb_byte *data, size_t size, | |
2835 | struct dwarf2_per_cu_data *per_cu) | |
4c2df51b | 2836 | { |
f630a401 | 2837 | int in_reg; |
ac56253d | 2838 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b | 2839 | |
eb115069 TT |
2840 | scoped_value_mark free_values; |
2841 | ||
192ca6d8 TT |
2842 | symbol_needs_eval_context ctx; |
2843 | ||
2844 | ctx.needs = SYMBOL_NEEDS_NONE; | |
2845 | ctx.per_cu = per_cu; | |
718b9626 TT |
2846 | ctx.gdbarch = get_objfile_arch (objfile); |
2847 | ctx.addr_size = dwarf2_per_cu_addr_size (per_cu); | |
2848 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); | |
2849 | ctx.offset = dwarf2_per_cu_text_offset (per_cu); | |
4c2df51b | 2850 | |
595d2e30 | 2851 | ctx.eval (data, size); |
4c2df51b | 2852 | |
718b9626 | 2853 | in_reg = ctx.location == DWARF_VALUE_REGISTER; |
f630a401 | 2854 | |
1e467161 SM |
2855 | /* If the location has several pieces, and any of them are in |
2856 | registers, then we will need a frame to fetch them from. */ | |
2857 | for (dwarf_expr_piece &p : ctx.pieces) | |
2858 | if (p.location == DWARF_VALUE_REGISTER) | |
2859 | in_reg = 1; | |
87808bd6 | 2860 | |
0b31a4bc | 2861 | if (in_reg) |
192ca6d8 TT |
2862 | ctx.needs = SYMBOL_NEEDS_FRAME; |
2863 | return ctx.needs; | |
4c2df51b DJ |
2864 | } |
2865 | ||
3cf03773 TT |
2866 | /* A helper function that throws an unimplemented error mentioning a |
2867 | given DWARF operator. */ | |
2868 | ||
2869 | static void | |
2870 | unimplemented (unsigned int op) | |
0d53c4c4 | 2871 | { |
f39c6ffd | 2872 | const char *name = get_DW_OP_name (op); |
b1bfef65 TT |
2873 | |
2874 | if (name) | |
2875 | error (_("DWARF operator %s cannot be translated to an agent expression"), | |
2876 | name); | |
2877 | else | |
1ba1b353 TT |
2878 | error (_("Unknown DWARF operator 0x%02x cannot be translated " |
2879 | "to an agent expression"), | |
b1bfef65 | 2880 | op); |
3cf03773 | 2881 | } |
08922a10 | 2882 | |
0fde2c53 DE |
2883 | /* See dwarf2loc.h. |
2884 | ||
2885 | This is basically a wrapper on gdbarch_dwarf2_reg_to_regnum so that we | |
2886 | can issue a complaint, which is better than having every target's | |
2887 | implementation of dwarf2_reg_to_regnum do it. */ | |
08922a10 | 2888 | |
d064d1be | 2889 | int |
0fde2c53 | 2890 | dwarf_reg_to_regnum (struct gdbarch *arch, int dwarf_reg) |
3cf03773 TT |
2891 | { |
2892 | int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg); | |
0fde2c53 | 2893 | |
3cf03773 | 2894 | if (reg == -1) |
0fde2c53 DE |
2895 | { |
2896 | complaint (&symfile_complaints, | |
2897 | _("bad DWARF register number %d"), dwarf_reg); | |
2898 | } | |
2899 | return reg; | |
2900 | } | |
2901 | ||
2902 | /* Subroutine of dwarf_reg_to_regnum_or_error to simplify it. | |
2903 | Throw an error because DWARF_REG is bad. */ | |
2904 | ||
2905 | static void | |
2906 | throw_bad_regnum_error (ULONGEST dwarf_reg) | |
2907 | { | |
2908 | /* Still want to print -1 as "-1". | |
2909 | We *could* have int and ULONGEST versions of dwarf2_reg_to_regnum_or_error | |
2910 | but that's overkill for now. */ | |
2911 | if ((int) dwarf_reg == dwarf_reg) | |
2912 | error (_("Unable to access DWARF register number %d"), (int) dwarf_reg); | |
2913 | error (_("Unable to access DWARF register number %s"), | |
2914 | pulongest (dwarf_reg)); | |
2915 | } | |
2916 | ||
2917 | /* See dwarf2loc.h. */ | |
2918 | ||
2919 | int | |
2920 | dwarf_reg_to_regnum_or_error (struct gdbarch *arch, ULONGEST dwarf_reg) | |
2921 | { | |
2922 | int reg; | |
2923 | ||
2924 | if (dwarf_reg > INT_MAX) | |
2925 | throw_bad_regnum_error (dwarf_reg); | |
2926 | /* Yes, we will end up issuing a complaint and an error if DWARF_REG is | |
2927 | bad, but that's ok. */ | |
2928 | reg = dwarf_reg_to_regnum (arch, (int) dwarf_reg); | |
2929 | if (reg == -1) | |
2930 | throw_bad_regnum_error (dwarf_reg); | |
3cf03773 TT |
2931 | return reg; |
2932 | } | |
08922a10 | 2933 | |
3cf03773 TT |
2934 | /* A helper function that emits an access to memory. ARCH is the |
2935 | target architecture. EXPR is the expression which we are building. | |
2936 | NBITS is the number of bits we want to read. This emits the | |
2937 | opcodes needed to read the memory and then extract the desired | |
2938 | bits. */ | |
08922a10 | 2939 | |
3cf03773 TT |
2940 | static void |
2941 | access_memory (struct gdbarch *arch, struct agent_expr *expr, ULONGEST nbits) | |
08922a10 | 2942 | { |
3cf03773 TT |
2943 | ULONGEST nbytes = (nbits + 7) / 8; |
2944 | ||
9df7235c | 2945 | gdb_assert (nbytes > 0 && nbytes <= sizeof (LONGEST)); |
3cf03773 | 2946 | |
92bc6a20 | 2947 | if (expr->tracing) |
3cf03773 TT |
2948 | ax_trace_quick (expr, nbytes); |
2949 | ||
2950 | if (nbits <= 8) | |
2951 | ax_simple (expr, aop_ref8); | |
2952 | else if (nbits <= 16) | |
2953 | ax_simple (expr, aop_ref16); | |
2954 | else if (nbits <= 32) | |
2955 | ax_simple (expr, aop_ref32); | |
2956 | else | |
2957 | ax_simple (expr, aop_ref64); | |
2958 | ||
2959 | /* If we read exactly the number of bytes we wanted, we're done. */ | |
2960 | if (8 * nbytes == nbits) | |
2961 | return; | |
2962 | ||
2963 | if (gdbarch_bits_big_endian (arch)) | |
0d53c4c4 | 2964 | { |
3cf03773 TT |
2965 | /* On a bits-big-endian machine, we want the high-order |
2966 | NBITS. */ | |
2967 | ax_const_l (expr, 8 * nbytes - nbits); | |
2968 | ax_simple (expr, aop_rsh_unsigned); | |
0d53c4c4 | 2969 | } |
3cf03773 | 2970 | else |
0d53c4c4 | 2971 | { |
3cf03773 TT |
2972 | /* On a bits-little-endian box, we want the low-order NBITS. */ |
2973 | ax_zero_ext (expr, nbits); | |
0d53c4c4 | 2974 | } |
3cf03773 | 2975 | } |
0936ad1d | 2976 | |
8cf6f0b1 TT |
2977 | /* A helper function to return the frame's PC. */ |
2978 | ||
2979 | static CORE_ADDR | |
2980 | get_ax_pc (void *baton) | |
2981 | { | |
9a3c8263 | 2982 | struct agent_expr *expr = (struct agent_expr *) baton; |
8cf6f0b1 TT |
2983 | |
2984 | return expr->scope; | |
2985 | } | |
2986 | ||
3cf03773 TT |
2987 | /* Compile a DWARF location expression to an agent expression. |
2988 | ||
2989 | EXPR is the agent expression we are building. | |
2990 | LOC is the agent value we modify. | |
2991 | ARCH is the architecture. | |
2992 | ADDR_SIZE is the size of addresses, in bytes. | |
2993 | OP_PTR is the start of the location expression. | |
2994 | OP_END is one past the last byte of the location expression. | |
2995 | ||
2996 | This will throw an exception for various kinds of errors -- for | |
2997 | example, if the expression cannot be compiled, or if the expression | |
2998 | is invalid. */ | |
0936ad1d | 2999 | |
9f6f94ff TT |
3000 | void |
3001 | dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
40f4af28 SM |
3002 | unsigned int addr_size, const gdb_byte *op_ptr, |
3003 | const gdb_byte *op_end, | |
9f6f94ff | 3004 | struct dwarf2_per_cu_data *per_cu) |
3cf03773 | 3005 | { |
40f4af28 | 3006 | gdbarch *arch = expr->gdbarch; |
58414334 TT |
3007 | int i; |
3008 | std::vector<int> dw_labels, patches; | |
3cf03773 TT |
3009 | const gdb_byte * const base = op_ptr; |
3010 | const gdb_byte *previous_piece = op_ptr; | |
3011 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
3012 | ULONGEST bits_collected = 0; | |
3013 | unsigned int addr_size_bits = 8 * addr_size; | |
3014 | int bits_big_endian = gdbarch_bits_big_endian (arch); | |
0936ad1d | 3015 | |
58414334 | 3016 | std::vector<int> offsets (op_end - op_ptr, -1); |
0936ad1d | 3017 | |
3cf03773 TT |
3018 | /* By default we are making an address. */ |
3019 | loc->kind = axs_lvalue_memory; | |
0d45f56e | 3020 | |
3cf03773 TT |
3021 | while (op_ptr < op_end) |
3022 | { | |
aead7601 | 3023 | enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr; |
9fccedf7 DE |
3024 | uint64_t uoffset, reg; |
3025 | int64_t offset; | |
3cf03773 TT |
3026 | int i; |
3027 | ||
3028 | offsets[op_ptr - base] = expr->len; | |
3029 | ++op_ptr; | |
3030 | ||
3031 | /* Our basic approach to code generation is to map DWARF | |
3032 | operations directly to AX operations. However, there are | |
3033 | some differences. | |
3034 | ||
3035 | First, DWARF works on address-sized units, but AX always uses | |
3036 | LONGEST. For most operations we simply ignore this | |
3037 | difference; instead we generate sign extensions as needed | |
3038 | before division and comparison operations. It would be nice | |
3039 | to omit the sign extensions, but there is no way to determine | |
3040 | the size of the target's LONGEST. (This code uses the size | |
3041 | of the host LONGEST in some cases -- that is a bug but it is | |
3042 | difficult to fix.) | |
3043 | ||
3044 | Second, some DWARF operations cannot be translated to AX. | |
3045 | For these we simply fail. See | |
3046 | http://sourceware.org/bugzilla/show_bug.cgi?id=11662. */ | |
3047 | switch (op) | |
0936ad1d | 3048 | { |
3cf03773 TT |
3049 | case DW_OP_lit0: |
3050 | case DW_OP_lit1: | |
3051 | case DW_OP_lit2: | |
3052 | case DW_OP_lit3: | |
3053 | case DW_OP_lit4: | |
3054 | case DW_OP_lit5: | |
3055 | case DW_OP_lit6: | |
3056 | case DW_OP_lit7: | |
3057 | case DW_OP_lit8: | |
3058 | case DW_OP_lit9: | |
3059 | case DW_OP_lit10: | |
3060 | case DW_OP_lit11: | |
3061 | case DW_OP_lit12: | |
3062 | case DW_OP_lit13: | |
3063 | case DW_OP_lit14: | |
3064 | case DW_OP_lit15: | |
3065 | case DW_OP_lit16: | |
3066 | case DW_OP_lit17: | |
3067 | case DW_OP_lit18: | |
3068 | case DW_OP_lit19: | |
3069 | case DW_OP_lit20: | |
3070 | case DW_OP_lit21: | |
3071 | case DW_OP_lit22: | |
3072 | case DW_OP_lit23: | |
3073 | case DW_OP_lit24: | |
3074 | case DW_OP_lit25: | |
3075 | case DW_OP_lit26: | |
3076 | case DW_OP_lit27: | |
3077 | case DW_OP_lit28: | |
3078 | case DW_OP_lit29: | |
3079 | case DW_OP_lit30: | |
3080 | case DW_OP_lit31: | |
3081 | ax_const_l (expr, op - DW_OP_lit0); | |
3082 | break; | |
0d53c4c4 | 3083 | |
3cf03773 | 3084 | case DW_OP_addr: |
ac56253d | 3085 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
3cf03773 | 3086 | op_ptr += addr_size; |
ac56253d TT |
3087 | /* Some versions of GCC emit DW_OP_addr before |
3088 | DW_OP_GNU_push_tls_address. In this case the value is an | |
3089 | index, not an address. We don't support things like | |
3090 | branching between the address and the TLS op. */ | |
3091 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
9aa1f1e3 | 3092 | uoffset += dwarf2_per_cu_text_offset (per_cu); |
ac56253d | 3093 | ax_const_l (expr, uoffset); |
3cf03773 | 3094 | break; |
4c2df51b | 3095 | |
3cf03773 TT |
3096 | case DW_OP_const1u: |
3097 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 1, byte_order)); | |
3098 | op_ptr += 1; | |
3099 | break; | |
3100 | case DW_OP_const1s: | |
3101 | ax_const_l (expr, extract_signed_integer (op_ptr, 1, byte_order)); | |
3102 | op_ptr += 1; | |
3103 | break; | |
3104 | case DW_OP_const2u: | |
3105 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 2, byte_order)); | |
3106 | op_ptr += 2; | |
3107 | break; | |
3108 | case DW_OP_const2s: | |
3109 | ax_const_l (expr, extract_signed_integer (op_ptr, 2, byte_order)); | |
3110 | op_ptr += 2; | |
3111 | break; | |
3112 | case DW_OP_const4u: | |
3113 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 4, byte_order)); | |
3114 | op_ptr += 4; | |
3115 | break; | |
3116 | case DW_OP_const4s: | |
3117 | ax_const_l (expr, extract_signed_integer (op_ptr, 4, byte_order)); | |
3118 | op_ptr += 4; | |
3119 | break; | |
3120 | case DW_OP_const8u: | |
3121 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 8, byte_order)); | |
3122 | op_ptr += 8; | |
3123 | break; | |
3124 | case DW_OP_const8s: | |
3125 | ax_const_l (expr, extract_signed_integer (op_ptr, 8, byte_order)); | |
3126 | op_ptr += 8; | |
3127 | break; | |
3128 | case DW_OP_constu: | |
f664829e | 3129 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
3cf03773 TT |
3130 | ax_const_l (expr, uoffset); |
3131 | break; | |
3132 | case DW_OP_consts: | |
f664829e | 3133 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
3cf03773 TT |
3134 | ax_const_l (expr, offset); |
3135 | break; | |
9c238357 | 3136 | |
3cf03773 TT |
3137 | case DW_OP_reg0: |
3138 | case DW_OP_reg1: | |
3139 | case DW_OP_reg2: | |
3140 | case DW_OP_reg3: | |
3141 | case DW_OP_reg4: | |
3142 | case DW_OP_reg5: | |
3143 | case DW_OP_reg6: | |
3144 | case DW_OP_reg7: | |
3145 | case DW_OP_reg8: | |
3146 | case DW_OP_reg9: | |
3147 | case DW_OP_reg10: | |
3148 | case DW_OP_reg11: | |
3149 | case DW_OP_reg12: | |
3150 | case DW_OP_reg13: | |
3151 | case DW_OP_reg14: | |
3152 | case DW_OP_reg15: | |
3153 | case DW_OP_reg16: | |
3154 | case DW_OP_reg17: | |
3155 | case DW_OP_reg18: | |
3156 | case DW_OP_reg19: | |
3157 | case DW_OP_reg20: | |
3158 | case DW_OP_reg21: | |
3159 | case DW_OP_reg22: | |
3160 | case DW_OP_reg23: | |
3161 | case DW_OP_reg24: | |
3162 | case DW_OP_reg25: | |
3163 | case DW_OP_reg26: | |
3164 | case DW_OP_reg27: | |
3165 | case DW_OP_reg28: | |
3166 | case DW_OP_reg29: | |
3167 | case DW_OP_reg30: | |
3168 | case DW_OP_reg31: | |
3169 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
0fde2c53 | 3170 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_reg0); |
3cf03773 TT |
3171 | loc->kind = axs_lvalue_register; |
3172 | break; | |
9c238357 | 3173 | |
3cf03773 | 3174 | case DW_OP_regx: |
f664829e | 3175 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 | 3176 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); |
0fde2c53 | 3177 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3178 | loc->kind = axs_lvalue_register; |
3179 | break; | |
08922a10 | 3180 | |
3cf03773 TT |
3181 | case DW_OP_implicit_value: |
3182 | { | |
9fccedf7 | 3183 | uint64_t len; |
3cf03773 | 3184 | |
f664829e | 3185 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &len); |
3cf03773 TT |
3186 | if (op_ptr + len > op_end) |
3187 | error (_("DW_OP_implicit_value: too few bytes available.")); | |
3188 | if (len > sizeof (ULONGEST)) | |
3189 | error (_("Cannot translate DW_OP_implicit_value of %d bytes"), | |
3190 | (int) len); | |
3191 | ||
3192 | ax_const_l (expr, extract_unsigned_integer (op_ptr, len, | |
3193 | byte_order)); | |
3194 | op_ptr += len; | |
3195 | dwarf_expr_require_composition (op_ptr, op_end, | |
3196 | "DW_OP_implicit_value"); | |
3197 | ||
3198 | loc->kind = axs_rvalue; | |
3199 | } | |
3200 | break; | |
08922a10 | 3201 | |
3cf03773 TT |
3202 | case DW_OP_stack_value: |
3203 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value"); | |
3204 | loc->kind = axs_rvalue; | |
3205 | break; | |
08922a10 | 3206 | |
3cf03773 TT |
3207 | case DW_OP_breg0: |
3208 | case DW_OP_breg1: | |
3209 | case DW_OP_breg2: | |
3210 | case DW_OP_breg3: | |
3211 | case DW_OP_breg4: | |
3212 | case DW_OP_breg5: | |
3213 | case DW_OP_breg6: | |
3214 | case DW_OP_breg7: | |
3215 | case DW_OP_breg8: | |
3216 | case DW_OP_breg9: | |
3217 | case DW_OP_breg10: | |
3218 | case DW_OP_breg11: | |
3219 | case DW_OP_breg12: | |
3220 | case DW_OP_breg13: | |
3221 | case DW_OP_breg14: | |
3222 | case DW_OP_breg15: | |
3223 | case DW_OP_breg16: | |
3224 | case DW_OP_breg17: | |
3225 | case DW_OP_breg18: | |
3226 | case DW_OP_breg19: | |
3227 | case DW_OP_breg20: | |
3228 | case DW_OP_breg21: | |
3229 | case DW_OP_breg22: | |
3230 | case DW_OP_breg23: | |
3231 | case DW_OP_breg24: | |
3232 | case DW_OP_breg25: | |
3233 | case DW_OP_breg26: | |
3234 | case DW_OP_breg27: | |
3235 | case DW_OP_breg28: | |
3236 | case DW_OP_breg29: | |
3237 | case DW_OP_breg30: | |
3238 | case DW_OP_breg31: | |
f664829e | 3239 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
0fde2c53 | 3240 | i = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_breg0); |
3cf03773 TT |
3241 | ax_reg (expr, i); |
3242 | if (offset != 0) | |
3243 | { | |
3244 | ax_const_l (expr, offset); | |
3245 | ax_simple (expr, aop_add); | |
3246 | } | |
3247 | break; | |
3248 | case DW_OP_bregx: | |
3249 | { | |
f664829e DE |
3250 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3251 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
0fde2c53 | 3252 | i = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3253 | ax_reg (expr, i); |
3254 | if (offset != 0) | |
3255 | { | |
3256 | ax_const_l (expr, offset); | |
3257 | ax_simple (expr, aop_add); | |
3258 | } | |
3259 | } | |
3260 | break; | |
3261 | case DW_OP_fbreg: | |
3262 | { | |
3263 | const gdb_byte *datastart; | |
3264 | size_t datalen; | |
3977b71f | 3265 | const struct block *b; |
3cf03773 | 3266 | struct symbol *framefunc; |
08922a10 | 3267 | |
3cf03773 TT |
3268 | b = block_for_pc (expr->scope); |
3269 | ||
3270 | if (!b) | |
3271 | error (_("No block found for address")); | |
3272 | ||
3273 | framefunc = block_linkage_function (b); | |
3274 | ||
3275 | if (!framefunc) | |
3276 | error (_("No function found for block")); | |
3277 | ||
af945b75 TT |
3278 | func_get_frame_base_dwarf_block (framefunc, expr->scope, |
3279 | &datastart, &datalen); | |
3cf03773 | 3280 | |
f664829e | 3281 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
40f4af28 | 3282 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, datastart, |
9f6f94ff | 3283 | datastart + datalen, per_cu); |
d84cf7eb TT |
3284 | if (loc->kind == axs_lvalue_register) |
3285 | require_rvalue (expr, loc); | |
3cf03773 TT |
3286 | |
3287 | if (offset != 0) | |
3288 | { | |
3289 | ax_const_l (expr, offset); | |
3290 | ax_simple (expr, aop_add); | |
3291 | } | |
3292 | ||
3293 | loc->kind = axs_lvalue_memory; | |
3294 | } | |
08922a10 | 3295 | break; |
08922a10 | 3296 | |
3cf03773 TT |
3297 | case DW_OP_dup: |
3298 | ax_simple (expr, aop_dup); | |
3299 | break; | |
08922a10 | 3300 | |
3cf03773 TT |
3301 | case DW_OP_drop: |
3302 | ax_simple (expr, aop_pop); | |
3303 | break; | |
08922a10 | 3304 | |
3cf03773 TT |
3305 | case DW_OP_pick: |
3306 | offset = *op_ptr++; | |
c7f96d2b | 3307 | ax_pick (expr, offset); |
3cf03773 TT |
3308 | break; |
3309 | ||
3310 | case DW_OP_swap: | |
3311 | ax_simple (expr, aop_swap); | |
3312 | break; | |
08922a10 | 3313 | |
3cf03773 | 3314 | case DW_OP_over: |
c7f96d2b | 3315 | ax_pick (expr, 1); |
3cf03773 | 3316 | break; |
08922a10 | 3317 | |
3cf03773 | 3318 | case DW_OP_rot: |
c7f96d2b | 3319 | ax_simple (expr, aop_rot); |
3cf03773 | 3320 | break; |
08922a10 | 3321 | |
3cf03773 TT |
3322 | case DW_OP_deref: |
3323 | case DW_OP_deref_size: | |
3324 | { | |
3325 | int size; | |
08922a10 | 3326 | |
3cf03773 TT |
3327 | if (op == DW_OP_deref_size) |
3328 | size = *op_ptr++; | |
3329 | else | |
3330 | size = addr_size; | |
3331 | ||
9df7235c | 3332 | if (size != 1 && size != 2 && size != 4 && size != 8) |
f3cec7e6 HZ |
3333 | error (_("Unsupported size %d in %s"), |
3334 | size, get_DW_OP_name (op)); | |
9df7235c | 3335 | access_memory (arch, expr, size * TARGET_CHAR_BIT); |
3cf03773 TT |
3336 | } |
3337 | break; | |
3338 | ||
3339 | case DW_OP_abs: | |
3340 | /* Sign extend the operand. */ | |
3341 | ax_ext (expr, addr_size_bits); | |
3342 | ax_simple (expr, aop_dup); | |
3343 | ax_const_l (expr, 0); | |
3344 | ax_simple (expr, aop_less_signed); | |
3345 | ax_simple (expr, aop_log_not); | |
3346 | i = ax_goto (expr, aop_if_goto); | |
3347 | /* We have to emit 0 - X. */ | |
3348 | ax_const_l (expr, 0); | |
3349 | ax_simple (expr, aop_swap); | |
3350 | ax_simple (expr, aop_sub); | |
3351 | ax_label (expr, i, expr->len); | |
3352 | break; | |
3353 | ||
3354 | case DW_OP_neg: | |
3355 | /* No need to sign extend here. */ | |
3356 | ax_const_l (expr, 0); | |
3357 | ax_simple (expr, aop_swap); | |
3358 | ax_simple (expr, aop_sub); | |
3359 | break; | |
3360 | ||
3361 | case DW_OP_not: | |
3362 | /* Sign extend the operand. */ | |
3363 | ax_ext (expr, addr_size_bits); | |
3364 | ax_simple (expr, aop_bit_not); | |
3365 | break; | |
3366 | ||
3367 | case DW_OP_plus_uconst: | |
f664829e | 3368 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 TT |
3369 | /* It would be really weird to emit `DW_OP_plus_uconst 0', |
3370 | but we micro-optimize anyhow. */ | |
3371 | if (reg != 0) | |
3372 | { | |
3373 | ax_const_l (expr, reg); | |
3374 | ax_simple (expr, aop_add); | |
3375 | } | |
3376 | break; | |
3377 | ||
3378 | case DW_OP_and: | |
3379 | ax_simple (expr, aop_bit_and); | |
3380 | break; | |
3381 | ||
3382 | case DW_OP_div: | |
3383 | /* Sign extend the operands. */ | |
3384 | ax_ext (expr, addr_size_bits); | |
3385 | ax_simple (expr, aop_swap); | |
3386 | ax_ext (expr, addr_size_bits); | |
3387 | ax_simple (expr, aop_swap); | |
3388 | ax_simple (expr, aop_div_signed); | |
08922a10 SS |
3389 | break; |
3390 | ||
3cf03773 TT |
3391 | case DW_OP_minus: |
3392 | ax_simple (expr, aop_sub); | |
3393 | break; | |
3394 | ||
3395 | case DW_OP_mod: | |
3396 | ax_simple (expr, aop_rem_unsigned); | |
3397 | break; | |
3398 | ||
3399 | case DW_OP_mul: | |
3400 | ax_simple (expr, aop_mul); | |
3401 | break; | |
3402 | ||
3403 | case DW_OP_or: | |
3404 | ax_simple (expr, aop_bit_or); | |
3405 | break; | |
3406 | ||
3407 | case DW_OP_plus: | |
3408 | ax_simple (expr, aop_add); | |
3409 | break; | |
3410 | ||
3411 | case DW_OP_shl: | |
3412 | ax_simple (expr, aop_lsh); | |
3413 | break; | |
3414 | ||
3415 | case DW_OP_shr: | |
3416 | ax_simple (expr, aop_rsh_unsigned); | |
3417 | break; | |
3418 | ||
3419 | case DW_OP_shra: | |
3420 | ax_simple (expr, aop_rsh_signed); | |
3421 | break; | |
3422 | ||
3423 | case DW_OP_xor: | |
3424 | ax_simple (expr, aop_bit_xor); | |
3425 | break; | |
3426 | ||
3427 | case DW_OP_le: | |
3428 | /* Sign extend the operands. */ | |
3429 | ax_ext (expr, addr_size_bits); | |
3430 | ax_simple (expr, aop_swap); | |
3431 | ax_ext (expr, addr_size_bits); | |
3432 | /* Note no swap here: A <= B is !(B < A). */ | |
3433 | ax_simple (expr, aop_less_signed); | |
3434 | ax_simple (expr, aop_log_not); | |
3435 | break; | |
3436 | ||
3437 | case DW_OP_ge: | |
3438 | /* Sign extend the operands. */ | |
3439 | ax_ext (expr, addr_size_bits); | |
3440 | ax_simple (expr, aop_swap); | |
3441 | ax_ext (expr, addr_size_bits); | |
3442 | ax_simple (expr, aop_swap); | |
3443 | /* A >= B is !(A < B). */ | |
3444 | ax_simple (expr, aop_less_signed); | |
3445 | ax_simple (expr, aop_log_not); | |
3446 | break; | |
3447 | ||
3448 | case DW_OP_eq: | |
3449 | /* Sign extend the operands. */ | |
3450 | ax_ext (expr, addr_size_bits); | |
3451 | ax_simple (expr, aop_swap); | |
3452 | ax_ext (expr, addr_size_bits); | |
3453 | /* No need for a second swap here. */ | |
3454 | ax_simple (expr, aop_equal); | |
3455 | break; | |
3456 | ||
3457 | case DW_OP_lt: | |
3458 | /* Sign extend the operands. */ | |
3459 | ax_ext (expr, addr_size_bits); | |
3460 | ax_simple (expr, aop_swap); | |
3461 | ax_ext (expr, addr_size_bits); | |
3462 | ax_simple (expr, aop_swap); | |
3463 | ax_simple (expr, aop_less_signed); | |
3464 | break; | |
3465 | ||
3466 | case DW_OP_gt: | |
3467 | /* Sign extend the operands. */ | |
3468 | ax_ext (expr, addr_size_bits); | |
3469 | ax_simple (expr, aop_swap); | |
3470 | ax_ext (expr, addr_size_bits); | |
3471 | /* Note no swap here: A > B is B < A. */ | |
3472 | ax_simple (expr, aop_less_signed); | |
3473 | break; | |
3474 | ||
3475 | case DW_OP_ne: | |
3476 | /* Sign extend the operands. */ | |
3477 | ax_ext (expr, addr_size_bits); | |
3478 | ax_simple (expr, aop_swap); | |
3479 | ax_ext (expr, addr_size_bits); | |
3480 | /* No need for a swap here. */ | |
3481 | ax_simple (expr, aop_equal); | |
3482 | ax_simple (expr, aop_log_not); | |
3483 | break; | |
3484 | ||
3485 | case DW_OP_call_frame_cfa: | |
a8fd5589 TT |
3486 | { |
3487 | int regnum; | |
3488 | CORE_ADDR text_offset; | |
3489 | LONGEST off; | |
3490 | const gdb_byte *cfa_start, *cfa_end; | |
3491 | ||
3492 | if (dwarf2_fetch_cfa_info (arch, expr->scope, per_cu, | |
3493 | ®num, &off, | |
3494 | &text_offset, &cfa_start, &cfa_end)) | |
3495 | { | |
3496 | /* Register. */ | |
3497 | ax_reg (expr, regnum); | |
3498 | if (off != 0) | |
3499 | { | |
3500 | ax_const_l (expr, off); | |
3501 | ax_simple (expr, aop_add); | |
3502 | } | |
3503 | } | |
3504 | else | |
3505 | { | |
3506 | /* Another expression. */ | |
3507 | ax_const_l (expr, text_offset); | |
40f4af28 SM |
3508 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, cfa_start, |
3509 | cfa_end, per_cu); | |
a8fd5589 TT |
3510 | } |
3511 | ||
3512 | loc->kind = axs_lvalue_memory; | |
3513 | } | |
3cf03773 TT |
3514 | break; |
3515 | ||
3516 | case DW_OP_GNU_push_tls_address: | |
4aa4e28b | 3517 | case DW_OP_form_tls_address: |
3cf03773 TT |
3518 | unimplemented (op); |
3519 | break; | |
3520 | ||
08412b07 JB |
3521 | case DW_OP_push_object_address: |
3522 | unimplemented (op); | |
3523 | break; | |
3524 | ||
3cf03773 TT |
3525 | case DW_OP_skip: |
3526 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3527 | op_ptr += 2; | |
3528 | i = ax_goto (expr, aop_goto); | |
58414334 TT |
3529 | dw_labels.push_back (op_ptr + offset - base); |
3530 | patches.push_back (i); | |
3cf03773 TT |
3531 | break; |
3532 | ||
3533 | case DW_OP_bra: | |
3534 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3535 | op_ptr += 2; | |
3536 | /* Zero extend the operand. */ | |
3537 | ax_zero_ext (expr, addr_size_bits); | |
3538 | i = ax_goto (expr, aop_if_goto); | |
58414334 TT |
3539 | dw_labels.push_back (op_ptr + offset - base); |
3540 | patches.push_back (i); | |
3cf03773 TT |
3541 | break; |
3542 | ||
3543 | case DW_OP_nop: | |
3544 | break; | |
3545 | ||
3546 | case DW_OP_piece: | |
3547 | case DW_OP_bit_piece: | |
08922a10 | 3548 | { |
9fccedf7 | 3549 | uint64_t size, offset; |
3cf03773 TT |
3550 | |
3551 | if (op_ptr - 1 == previous_piece) | |
3552 | error (_("Cannot translate empty pieces to agent expressions")); | |
3553 | previous_piece = op_ptr - 1; | |
3554 | ||
f664829e | 3555 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &size); |
3cf03773 TT |
3556 | if (op == DW_OP_piece) |
3557 | { | |
3558 | size *= 8; | |
3559 | offset = 0; | |
3560 | } | |
3561 | else | |
f664829e | 3562 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &offset); |
08922a10 | 3563 | |
3cf03773 TT |
3564 | if (bits_collected + size > 8 * sizeof (LONGEST)) |
3565 | error (_("Expression pieces exceed word size")); | |
3566 | ||
3567 | /* Access the bits. */ | |
3568 | switch (loc->kind) | |
3569 | { | |
3570 | case axs_lvalue_register: | |
3571 | ax_reg (expr, loc->u.reg); | |
3572 | break; | |
3573 | ||
3574 | case axs_lvalue_memory: | |
3575 | /* Offset the pointer, if needed. */ | |
3576 | if (offset > 8) | |
3577 | { | |
3578 | ax_const_l (expr, offset / 8); | |
3579 | ax_simple (expr, aop_add); | |
3580 | offset %= 8; | |
3581 | } | |
3582 | access_memory (arch, expr, size); | |
3583 | break; | |
3584 | } | |
3585 | ||
3586 | /* For a bits-big-endian target, shift up what we already | |
3587 | have. For a bits-little-endian target, shift up the | |
3588 | new data. Note that there is a potential bug here if | |
3589 | the DWARF expression leaves multiple values on the | |
3590 | stack. */ | |
3591 | if (bits_collected > 0) | |
3592 | { | |
3593 | if (bits_big_endian) | |
3594 | { | |
3595 | ax_simple (expr, aop_swap); | |
3596 | ax_const_l (expr, size); | |
3597 | ax_simple (expr, aop_lsh); | |
3598 | /* We don't need a second swap here, because | |
3599 | aop_bit_or is symmetric. */ | |
3600 | } | |
3601 | else | |
3602 | { | |
3603 | ax_const_l (expr, size); | |
3604 | ax_simple (expr, aop_lsh); | |
3605 | } | |
3606 | ax_simple (expr, aop_bit_or); | |
3607 | } | |
3608 | ||
3609 | bits_collected += size; | |
3610 | loc->kind = axs_rvalue; | |
08922a10 SS |
3611 | } |
3612 | break; | |
08922a10 | 3613 | |
3cf03773 TT |
3614 | case DW_OP_GNU_uninit: |
3615 | unimplemented (op); | |
3616 | ||
3617 | case DW_OP_call2: | |
3618 | case DW_OP_call4: | |
3619 | { | |
3620 | struct dwarf2_locexpr_baton block; | |
3621 | int size = (op == DW_OP_call2 ? 2 : 4); | |
3622 | ||
3623 | uoffset = extract_unsigned_integer (op_ptr, size, byte_order); | |
3624 | op_ptr += size; | |
3625 | ||
9c541725 | 3626 | cu_offset offset = (cu_offset) uoffset; |
8b9737bf TT |
3627 | block = dwarf2_fetch_die_loc_cu_off (offset, per_cu, |
3628 | get_ax_pc, expr); | |
3cf03773 TT |
3629 | |
3630 | /* DW_OP_call_ref is currently not supported. */ | |
3631 | gdb_assert (block.per_cu == per_cu); | |
3632 | ||
40f4af28 SM |
3633 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, block.data, |
3634 | block.data + block.size, per_cu); | |
3cf03773 TT |
3635 | } |
3636 | break; | |
3637 | ||
3638 | case DW_OP_call_ref: | |
3639 | unimplemented (op); | |
3640 | ||
3641 | default: | |
b1bfef65 | 3642 | unimplemented (op); |
08922a10 | 3643 | } |
08922a10 | 3644 | } |
3cf03773 TT |
3645 | |
3646 | /* Patch all the branches we emitted. */ | |
58414334 | 3647 | for (i = 0; i < patches.size (); ++i) |
3cf03773 | 3648 | { |
58414334 | 3649 | int targ = offsets[dw_labels[i]]; |
3cf03773 TT |
3650 | if (targ == -1) |
3651 | internal_error (__FILE__, __LINE__, _("invalid label")); | |
58414334 | 3652 | ax_label (expr, patches[i], targ); |
3cf03773 | 3653 | } |
08922a10 SS |
3654 | } |
3655 | ||
4c2df51b DJ |
3656 | \f |
3657 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
3658 | evaluator to calculate the location. */ | |
3659 | static struct value * | |
3660 | locexpr_read_variable (struct symbol *symbol, struct frame_info *frame) | |
3661 | { | |
9a3c8263 SM |
3662 | struct dwarf2_locexpr_baton *dlbaton |
3663 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
4c2df51b | 3664 | struct value *val; |
9a619af0 | 3665 | |
a2d33775 JK |
3666 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data, |
3667 | dlbaton->size, dlbaton->per_cu); | |
4c2df51b DJ |
3668 | |
3669 | return val; | |
3670 | } | |
3671 | ||
e18b2753 JK |
3672 | /* Return the value of SYMBOL in FRAME at (callee) FRAME's function |
3673 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
3674 | will be thrown. */ | |
3675 | ||
3676 | static struct value * | |
3677 | locexpr_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
3678 | { | |
9a3c8263 SM |
3679 | struct dwarf2_locexpr_baton *dlbaton |
3680 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
3681 | |
3682 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, dlbaton->data, | |
3683 | dlbaton->size); | |
3684 | } | |
3685 | ||
0b31a4bc TT |
3686 | /* Implementation of get_symbol_read_needs from |
3687 | symbol_computed_ops. */ | |
3688 | ||
3689 | static enum symbol_needs_kind | |
3690 | locexpr_get_symbol_read_needs (struct symbol *symbol) | |
4c2df51b | 3691 | { |
9a3c8263 SM |
3692 | struct dwarf2_locexpr_baton *dlbaton |
3693 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
9a619af0 | 3694 | |
0b31a4bc TT |
3695 | return dwarf2_loc_desc_get_symbol_read_needs (dlbaton->data, dlbaton->size, |
3696 | dlbaton->per_cu); | |
4c2df51b DJ |
3697 | } |
3698 | ||
9eae7c52 TT |
3699 | /* Return true if DATA points to the end of a piece. END is one past |
3700 | the last byte in the expression. */ | |
3701 | ||
3702 | static int | |
3703 | piece_end_p (const gdb_byte *data, const gdb_byte *end) | |
3704 | { | |
3705 | return data == end || data[0] == DW_OP_piece || data[0] == DW_OP_bit_piece; | |
3706 | } | |
3707 | ||
5e44ecb3 TT |
3708 | /* Helper for locexpr_describe_location_piece that finds the name of a |
3709 | DWARF register. */ | |
3710 | ||
3711 | static const char * | |
3712 | locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum) | |
3713 | { | |
3714 | int regnum; | |
3715 | ||
0fde2c53 DE |
3716 | /* This doesn't use dwarf_reg_to_regnum_or_error on purpose. |
3717 | We'd rather print *something* here than throw an error. */ | |
3718 | regnum = dwarf_reg_to_regnum (gdbarch, dwarf_regnum); | |
3719 | /* gdbarch_register_name may just return "", return something more | |
3720 | descriptive for bad register numbers. */ | |
3721 | if (regnum == -1) | |
3722 | { | |
3723 | /* The text is output as "$bad_register_number". | |
3724 | That is why we use the underscores. */ | |
3725 | return _("bad_register_number"); | |
3726 | } | |
5e44ecb3 TT |
3727 | return gdbarch_register_name (gdbarch, regnum); |
3728 | } | |
3729 | ||
9eae7c52 TT |
3730 | /* Nicely describe a single piece of a location, returning an updated |
3731 | position in the bytecode sequence. This function cannot recognize | |
3732 | all locations; if a location is not recognized, it simply returns | |
f664829e DE |
3733 | DATA. If there is an error during reading, e.g. we run off the end |
3734 | of the buffer, an error is thrown. */ | |
08922a10 | 3735 | |
0d45f56e | 3736 | static const gdb_byte * |
08922a10 SS |
3737 | locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream, |
3738 | CORE_ADDR addr, struct objfile *objfile, | |
49f6c839 | 3739 | struct dwarf2_per_cu_data *per_cu, |
9eae7c52 | 3740 | const gdb_byte *data, const gdb_byte *end, |
0d45f56e | 3741 | unsigned int addr_size) |
4c2df51b | 3742 | { |
08922a10 | 3743 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
49f6c839 | 3744 | size_t leb128_size; |
08922a10 SS |
3745 | |
3746 | if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31) | |
3747 | { | |
08922a10 | 3748 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3749 | locexpr_regname (gdbarch, data[0] - DW_OP_reg0)); |
08922a10 SS |
3750 | data += 1; |
3751 | } | |
3752 | else if (data[0] == DW_OP_regx) | |
3753 | { | |
9fccedf7 | 3754 | uint64_t reg; |
4c2df51b | 3755 | |
f664829e | 3756 | data = safe_read_uleb128 (data + 1, end, ®); |
08922a10 | 3757 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3758 | locexpr_regname (gdbarch, reg)); |
08922a10 SS |
3759 | } |
3760 | else if (data[0] == DW_OP_fbreg) | |
4c2df51b | 3761 | { |
3977b71f | 3762 | const struct block *b; |
08922a10 SS |
3763 | struct symbol *framefunc; |
3764 | int frame_reg = 0; | |
9fccedf7 | 3765 | int64_t frame_offset; |
7155d578 | 3766 | const gdb_byte *base_data, *new_data, *save_data = data; |
08922a10 | 3767 | size_t base_size; |
9fccedf7 | 3768 | int64_t base_offset = 0; |
08922a10 | 3769 | |
f664829e | 3770 | new_data = safe_read_sleb128 (data + 1, end, &frame_offset); |
9eae7c52 TT |
3771 | if (!piece_end_p (new_data, end)) |
3772 | return data; | |
3773 | data = new_data; | |
3774 | ||
08922a10 SS |
3775 | b = block_for_pc (addr); |
3776 | ||
3777 | if (!b) | |
3778 | error (_("No block found for address for symbol \"%s\"."), | |
3779 | SYMBOL_PRINT_NAME (symbol)); | |
3780 | ||
3781 | framefunc = block_linkage_function (b); | |
3782 | ||
3783 | if (!framefunc) | |
3784 | error (_("No function found for block for symbol \"%s\"."), | |
3785 | SYMBOL_PRINT_NAME (symbol)); | |
3786 | ||
af945b75 | 3787 | func_get_frame_base_dwarf_block (framefunc, addr, &base_data, &base_size); |
08922a10 SS |
3788 | |
3789 | if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31) | |
3790 | { | |
0d45f56e | 3791 | const gdb_byte *buf_end; |
08922a10 SS |
3792 | |
3793 | frame_reg = base_data[0] - DW_OP_breg0; | |
f664829e DE |
3794 | buf_end = safe_read_sleb128 (base_data + 1, base_data + base_size, |
3795 | &base_offset); | |
08922a10 | 3796 | if (buf_end != base_data + base_size) |
3e43a32a MS |
3797 | error (_("Unexpected opcode after " |
3798 | "DW_OP_breg%u for symbol \"%s\"."), | |
08922a10 SS |
3799 | frame_reg, SYMBOL_PRINT_NAME (symbol)); |
3800 | } | |
3801 | else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31) | |
3802 | { | |
3803 | /* The frame base is just the register, with no offset. */ | |
3804 | frame_reg = base_data[0] - DW_OP_reg0; | |
3805 | base_offset = 0; | |
3806 | } | |
3807 | else | |
3808 | { | |
3809 | /* We don't know what to do with the frame base expression, | |
3810 | so we can't trace this variable; give up. */ | |
7155d578 | 3811 | return save_data; |
08922a10 SS |
3812 | } |
3813 | ||
3e43a32a MS |
3814 | fprintf_filtered (stream, |
3815 | _("a variable at frame base reg $%s offset %s+%s"), | |
5e44ecb3 | 3816 | locexpr_regname (gdbarch, frame_reg), |
08922a10 SS |
3817 | plongest (base_offset), plongest (frame_offset)); |
3818 | } | |
9eae7c52 TT |
3819 | else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31 |
3820 | && piece_end_p (data, end)) | |
08922a10 | 3821 | { |
9fccedf7 | 3822 | int64_t offset; |
08922a10 | 3823 | |
f664829e | 3824 | data = safe_read_sleb128 (data + 1, end, &offset); |
08922a10 | 3825 | |
4c2df51b | 3826 | fprintf_filtered (stream, |
08922a10 SS |
3827 | _("a variable at offset %s from base reg $%s"), |
3828 | plongest (offset), | |
5e44ecb3 | 3829 | locexpr_regname (gdbarch, data[0] - DW_OP_breg0)); |
4c2df51b DJ |
3830 | } |
3831 | ||
c3228f12 EZ |
3832 | /* The location expression for a TLS variable looks like this (on a |
3833 | 64-bit LE machine): | |
3834 | ||
3835 | DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0 | |
3836 | (DW_OP_addr: 4; DW_OP_GNU_push_tls_address) | |
09d8bd00 | 3837 | |
c3228f12 EZ |
3838 | 0x3 is the encoding for DW_OP_addr, which has an operand as long |
3839 | as the size of an address on the target machine (here is 8 | |
09d8bd00 TT |
3840 | bytes). Note that more recent version of GCC emit DW_OP_const4u |
3841 | or DW_OP_const8u, depending on address size, rather than | |
0963b4bd MS |
3842 | DW_OP_addr. 0xe0 is the encoding for DW_OP_GNU_push_tls_address. |
3843 | The operand represents the offset at which the variable is within | |
3844 | the thread local storage. */ | |
c3228f12 | 3845 | |
9eae7c52 | 3846 | else if (data + 1 + addr_size < end |
09d8bd00 TT |
3847 | && (data[0] == DW_OP_addr |
3848 | || (addr_size == 4 && data[0] == DW_OP_const4u) | |
3849 | || (addr_size == 8 && data[0] == DW_OP_const8u)) | |
4aa4e28b TT |
3850 | && (data[1 + addr_size] == DW_OP_GNU_push_tls_address |
3851 | || data[1 + addr_size] == DW_OP_form_tls_address) | |
9eae7c52 | 3852 | && piece_end_p (data + 2 + addr_size, end)) |
08922a10 | 3853 | { |
d4a087c7 UW |
3854 | ULONGEST offset; |
3855 | offset = extract_unsigned_integer (data + 1, addr_size, | |
3856 | gdbarch_byte_order (gdbarch)); | |
9a619af0 | 3857 | |
08922a10 | 3858 | fprintf_filtered (stream, |
d4a087c7 | 3859 | _("a thread-local variable at offset 0x%s " |
08922a10 | 3860 | "in the thread-local storage for `%s'"), |
4262abfb | 3861 | phex_nz (offset, addr_size), objfile_name (objfile)); |
08922a10 SS |
3862 | |
3863 | data += 1 + addr_size + 1; | |
3864 | } | |
49f6c839 DE |
3865 | |
3866 | /* With -gsplit-dwarf a TLS variable can also look like this: | |
3867 | DW_AT_location : 3 byte block: fc 4 e0 | |
3868 | (DW_OP_GNU_const_index: 4; | |
3869 | DW_OP_GNU_push_tls_address) */ | |
3870 | else if (data + 3 <= end | |
3871 | && data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end | |
3872 | && data[0] == DW_OP_GNU_const_index | |
3873 | && leb128_size > 0 | |
4aa4e28b TT |
3874 | && (data[1 + leb128_size] == DW_OP_GNU_push_tls_address |
3875 | || data[1 + leb128_size] == DW_OP_form_tls_address) | |
49f6c839 DE |
3876 | && piece_end_p (data + 2 + leb128_size, end)) |
3877 | { | |
a55c1f32 | 3878 | uint64_t offset; |
49f6c839 DE |
3879 | |
3880 | data = safe_read_uleb128 (data + 1, end, &offset); | |
3881 | offset = dwarf2_read_addr_index (per_cu, offset); | |
3882 | fprintf_filtered (stream, | |
3883 | _("a thread-local variable at offset 0x%s " | |
3884 | "in the thread-local storage for `%s'"), | |
4262abfb | 3885 | phex_nz (offset, addr_size), objfile_name (objfile)); |
49f6c839 DE |
3886 | ++data; |
3887 | } | |
3888 | ||
9eae7c52 TT |
3889 | else if (data[0] >= DW_OP_lit0 |
3890 | && data[0] <= DW_OP_lit31 | |
3891 | && data + 1 < end | |
3892 | && data[1] == DW_OP_stack_value) | |
3893 | { | |
3894 | fprintf_filtered (stream, _("the constant %d"), data[0] - DW_OP_lit0); | |
3895 | data += 2; | |
3896 | } | |
3897 | ||
3898 | return data; | |
3899 | } | |
3900 | ||
3901 | /* Disassemble an expression, stopping at the end of a piece or at the | |
3902 | end of the expression. Returns a pointer to the next unread byte | |
3903 | in the input expression. If ALL is nonzero, then this function | |
f664829e DE |
3904 | will keep going until it reaches the end of the expression. |
3905 | If there is an error during reading, e.g. we run off the end | |
3906 | of the buffer, an error is thrown. */ | |
9eae7c52 TT |
3907 | |
3908 | static const gdb_byte * | |
3909 | disassemble_dwarf_expression (struct ui_file *stream, | |
3910 | struct gdbarch *arch, unsigned int addr_size, | |
2bda9cc5 | 3911 | int offset_size, const gdb_byte *start, |
9eae7c52 | 3912 | const gdb_byte *data, const gdb_byte *end, |
2bda9cc5 | 3913 | int indent, int all, |
5e44ecb3 | 3914 | struct dwarf2_per_cu_data *per_cu) |
9eae7c52 | 3915 | { |
9eae7c52 TT |
3916 | while (data < end |
3917 | && (all | |
3918 | || (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece))) | |
3919 | { | |
aead7601 | 3920 | enum dwarf_location_atom op = (enum dwarf_location_atom) *data++; |
9fccedf7 DE |
3921 | uint64_t ul; |
3922 | int64_t l; | |
9eae7c52 TT |
3923 | const char *name; |
3924 | ||
f39c6ffd | 3925 | name = get_DW_OP_name (op); |
9eae7c52 TT |
3926 | |
3927 | if (!name) | |
3928 | error (_("Unrecognized DWARF opcode 0x%02x at %ld"), | |
06826322 | 3929 | op, (long) (data - 1 - start)); |
2bda9cc5 JK |
3930 | fprintf_filtered (stream, " %*ld: %s", indent + 4, |
3931 | (long) (data - 1 - start), name); | |
9eae7c52 TT |
3932 | |
3933 | switch (op) | |
3934 | { | |
3935 | case DW_OP_addr: | |
d4a087c7 UW |
3936 | ul = extract_unsigned_integer (data, addr_size, |
3937 | gdbarch_byte_order (arch)); | |
9eae7c52 | 3938 | data += addr_size; |
d4a087c7 | 3939 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); |
9eae7c52 TT |
3940 | break; |
3941 | ||
3942 | case DW_OP_const1u: | |
3943 | ul = extract_unsigned_integer (data, 1, gdbarch_byte_order (arch)); | |
3944 | data += 1; | |
3945 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3946 | break; | |
3947 | case DW_OP_const1s: | |
3948 | l = extract_signed_integer (data, 1, gdbarch_byte_order (arch)); | |
3949 | data += 1; | |
3950 | fprintf_filtered (stream, " %s", plongest (l)); | |
3951 | break; | |
3952 | case DW_OP_const2u: | |
3953 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3954 | data += 2; | |
3955 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3956 | break; | |
3957 | case DW_OP_const2s: | |
3958 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3959 | data += 2; | |
3960 | fprintf_filtered (stream, " %s", plongest (l)); | |
3961 | break; | |
3962 | case DW_OP_const4u: | |
3963 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3964 | data += 4; | |
3965 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3966 | break; | |
3967 | case DW_OP_const4s: | |
3968 | l = extract_signed_integer (data, 4, gdbarch_byte_order (arch)); | |
3969 | data += 4; | |
3970 | fprintf_filtered (stream, " %s", plongest (l)); | |
3971 | break; | |
3972 | case DW_OP_const8u: | |
3973 | ul = extract_unsigned_integer (data, 8, gdbarch_byte_order (arch)); | |
3974 | data += 8; | |
3975 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3976 | break; | |
3977 | case DW_OP_const8s: | |
3978 | l = extract_signed_integer (data, 8, gdbarch_byte_order (arch)); | |
3979 | data += 8; | |
3980 | fprintf_filtered (stream, " %s", plongest (l)); | |
3981 | break; | |
3982 | case DW_OP_constu: | |
f664829e | 3983 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3984 | fprintf_filtered (stream, " %s", pulongest (ul)); |
3985 | break; | |
3986 | case DW_OP_consts: | |
f664829e | 3987 | data = safe_read_sleb128 (data, end, &l); |
9eae7c52 TT |
3988 | fprintf_filtered (stream, " %s", plongest (l)); |
3989 | break; | |
3990 | ||
3991 | case DW_OP_reg0: | |
3992 | case DW_OP_reg1: | |
3993 | case DW_OP_reg2: | |
3994 | case DW_OP_reg3: | |
3995 | case DW_OP_reg4: | |
3996 | case DW_OP_reg5: | |
3997 | case DW_OP_reg6: | |
3998 | case DW_OP_reg7: | |
3999 | case DW_OP_reg8: | |
4000 | case DW_OP_reg9: | |
4001 | case DW_OP_reg10: | |
4002 | case DW_OP_reg11: | |
4003 | case DW_OP_reg12: | |
4004 | case DW_OP_reg13: | |
4005 | case DW_OP_reg14: | |
4006 | case DW_OP_reg15: | |
4007 | case DW_OP_reg16: | |
4008 | case DW_OP_reg17: | |
4009 | case DW_OP_reg18: | |
4010 | case DW_OP_reg19: | |
4011 | case DW_OP_reg20: | |
4012 | case DW_OP_reg21: | |
4013 | case DW_OP_reg22: | |
4014 | case DW_OP_reg23: | |
4015 | case DW_OP_reg24: | |
4016 | case DW_OP_reg25: | |
4017 | case DW_OP_reg26: | |
4018 | case DW_OP_reg27: | |
4019 | case DW_OP_reg28: | |
4020 | case DW_OP_reg29: | |
4021 | case DW_OP_reg30: | |
4022 | case DW_OP_reg31: | |
4023 | fprintf_filtered (stream, " [$%s]", | |
5e44ecb3 | 4024 | locexpr_regname (arch, op - DW_OP_reg0)); |
9eae7c52 TT |
4025 | break; |
4026 | ||
4027 | case DW_OP_regx: | |
f664829e | 4028 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 | 4029 | fprintf_filtered (stream, " %s [$%s]", pulongest (ul), |
5e44ecb3 | 4030 | locexpr_regname (arch, (int) ul)); |
9eae7c52 TT |
4031 | break; |
4032 | ||
4033 | case DW_OP_implicit_value: | |
f664829e | 4034 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4035 | data += ul; |
4036 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4037 | break; | |
4038 | ||
4039 | case DW_OP_breg0: | |
4040 | case DW_OP_breg1: | |
4041 | case DW_OP_breg2: | |
4042 | case DW_OP_breg3: | |
4043 | case DW_OP_breg4: | |
4044 | case DW_OP_breg5: | |
4045 | case DW_OP_breg6: | |
4046 | case DW_OP_breg7: | |
4047 | case DW_OP_breg8: | |
4048 | case DW_OP_breg9: | |
4049 | case DW_OP_breg10: | |
4050 | case DW_OP_breg11: | |
4051 | case DW_OP_breg12: | |
4052 | case DW_OP_breg13: | |
4053 | case DW_OP_breg14: | |
4054 | case DW_OP_breg15: | |
4055 | case DW_OP_breg16: | |
4056 | case DW_OP_breg17: | |
4057 | case DW_OP_breg18: | |
4058 | case DW_OP_breg19: | |
4059 | case DW_OP_breg20: | |
4060 | case DW_OP_breg21: | |
4061 | case DW_OP_breg22: | |
4062 | case DW_OP_breg23: | |
4063 | case DW_OP_breg24: | |
4064 | case DW_OP_breg25: | |
4065 | case DW_OP_breg26: | |
4066 | case DW_OP_breg27: | |
4067 | case DW_OP_breg28: | |
4068 | case DW_OP_breg29: | |
4069 | case DW_OP_breg30: | |
4070 | case DW_OP_breg31: | |
f664829e | 4071 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 4072 | fprintf_filtered (stream, " %s [$%s]", plongest (l), |
5e44ecb3 | 4073 | locexpr_regname (arch, op - DW_OP_breg0)); |
9eae7c52 TT |
4074 | break; |
4075 | ||
4076 | case DW_OP_bregx: | |
f664829e DE |
4077 | data = safe_read_uleb128 (data, end, &ul); |
4078 | data = safe_read_sleb128 (data, end, &l); | |
0502ed8c JK |
4079 | fprintf_filtered (stream, " register %s [$%s] offset %s", |
4080 | pulongest (ul), | |
5e44ecb3 | 4081 | locexpr_regname (arch, (int) ul), |
0502ed8c | 4082 | plongest (l)); |
9eae7c52 TT |
4083 | break; |
4084 | ||
4085 | case DW_OP_fbreg: | |
f664829e | 4086 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 4087 | fprintf_filtered (stream, " %s", plongest (l)); |
9eae7c52 TT |
4088 | break; |
4089 | ||
4090 | case DW_OP_xderef_size: | |
4091 | case DW_OP_deref_size: | |
4092 | case DW_OP_pick: | |
4093 | fprintf_filtered (stream, " %d", *data); | |
4094 | ++data; | |
4095 | break; | |
4096 | ||
4097 | case DW_OP_plus_uconst: | |
f664829e | 4098 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4099 | fprintf_filtered (stream, " %s", pulongest (ul)); |
4100 | break; | |
4101 | ||
4102 | case DW_OP_skip: | |
4103 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4104 | data += 2; | |
4105 | fprintf_filtered (stream, " to %ld", | |
4106 | (long) (data + l - start)); | |
4107 | break; | |
4108 | ||
4109 | case DW_OP_bra: | |
4110 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4111 | data += 2; | |
4112 | fprintf_filtered (stream, " %ld", | |
4113 | (long) (data + l - start)); | |
4114 | break; | |
4115 | ||
4116 | case DW_OP_call2: | |
4117 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
4118 | data += 2; | |
4119 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 2)); | |
4120 | break; | |
4121 | ||
4122 | case DW_OP_call4: | |
4123 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4124 | data += 4; | |
4125 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4126 | break; | |
4127 | ||
4128 | case DW_OP_call_ref: | |
4129 | ul = extract_unsigned_integer (data, offset_size, | |
4130 | gdbarch_byte_order (arch)); | |
4131 | data += offset_size; | |
4132 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
4133 | break; | |
4134 | ||
4135 | case DW_OP_piece: | |
f664829e | 4136 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4137 | fprintf_filtered (stream, " %s (bytes)", pulongest (ul)); |
4138 | break; | |
4139 | ||
4140 | case DW_OP_bit_piece: | |
4141 | { | |
9fccedf7 | 4142 | uint64_t offset; |
9eae7c52 | 4143 | |
f664829e DE |
4144 | data = safe_read_uleb128 (data, end, &ul); |
4145 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4146 | fprintf_filtered (stream, " size %s offset %s (bits)", |
4147 | pulongest (ul), pulongest (offset)); | |
4148 | } | |
4149 | break; | |
8cf6f0b1 | 4150 | |
216f72a1 | 4151 | case DW_OP_implicit_pointer: |
8cf6f0b1 TT |
4152 | case DW_OP_GNU_implicit_pointer: |
4153 | { | |
4154 | ul = extract_unsigned_integer (data, offset_size, | |
4155 | gdbarch_byte_order (arch)); | |
4156 | data += offset_size; | |
4157 | ||
f664829e | 4158 | data = safe_read_sleb128 (data, end, &l); |
8cf6f0b1 TT |
4159 | |
4160 | fprintf_filtered (stream, " DIE %s offset %s", | |
4161 | phex_nz (ul, offset_size), | |
4162 | plongest (l)); | |
4163 | } | |
4164 | break; | |
5e44ecb3 | 4165 | |
216f72a1 | 4166 | case DW_OP_deref_type: |
5e44ecb3 TT |
4167 | case DW_OP_GNU_deref_type: |
4168 | { | |
4169 | int addr_size = *data++; | |
5e44ecb3 TT |
4170 | struct type *type; |
4171 | ||
f664829e | 4172 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4173 | cu_offset offset = (cu_offset) ul; |
5e44ecb3 TT |
4174 | type = dwarf2_get_die_type (offset, per_cu); |
4175 | fprintf_filtered (stream, "<"); | |
4176 | type_print (type, "", stream, -1); | |
9c541725 PA |
4177 | fprintf_filtered (stream, " [0x%s]> %d", |
4178 | phex_nz (to_underlying (offset), 0), | |
5e44ecb3 TT |
4179 | addr_size); |
4180 | } | |
4181 | break; | |
4182 | ||
216f72a1 | 4183 | case DW_OP_const_type: |
5e44ecb3 TT |
4184 | case DW_OP_GNU_const_type: |
4185 | { | |
5e44ecb3 TT |
4186 | struct type *type; |
4187 | ||
f664829e | 4188 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4189 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 TT |
4190 | type = dwarf2_get_die_type (type_die, per_cu); |
4191 | fprintf_filtered (stream, "<"); | |
4192 | type_print (type, "", stream, -1); | |
9c541725 PA |
4193 | fprintf_filtered (stream, " [0x%s]>", |
4194 | phex_nz (to_underlying (type_die), 0)); | |
5e44ecb3 TT |
4195 | } |
4196 | break; | |
4197 | ||
216f72a1 | 4198 | case DW_OP_regval_type: |
5e44ecb3 TT |
4199 | case DW_OP_GNU_regval_type: |
4200 | { | |
9fccedf7 | 4201 | uint64_t reg; |
5e44ecb3 TT |
4202 | struct type *type; |
4203 | ||
f664829e DE |
4204 | data = safe_read_uleb128 (data, end, ®); |
4205 | data = safe_read_uleb128 (data, end, &ul); | |
9c541725 | 4206 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 TT |
4207 | |
4208 | type = dwarf2_get_die_type (type_die, per_cu); | |
4209 | fprintf_filtered (stream, "<"); | |
4210 | type_print (type, "", stream, -1); | |
b64f50a1 | 4211 | fprintf_filtered (stream, " [0x%s]> [$%s]", |
9c541725 | 4212 | phex_nz (to_underlying (type_die), 0), |
5e44ecb3 TT |
4213 | locexpr_regname (arch, reg)); |
4214 | } | |
4215 | break; | |
4216 | ||
216f72a1 | 4217 | case DW_OP_convert: |
5e44ecb3 | 4218 | case DW_OP_GNU_convert: |
216f72a1 | 4219 | case DW_OP_reinterpret: |
5e44ecb3 TT |
4220 | case DW_OP_GNU_reinterpret: |
4221 | { | |
f664829e | 4222 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4223 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 | 4224 | |
9c541725 | 4225 | if (to_underlying (type_die) == 0) |
5e44ecb3 TT |
4226 | fprintf_filtered (stream, "<0>"); |
4227 | else | |
4228 | { | |
4229 | struct type *type; | |
4230 | ||
4231 | type = dwarf2_get_die_type (type_die, per_cu); | |
4232 | fprintf_filtered (stream, "<"); | |
4233 | type_print (type, "", stream, -1); | |
9c541725 PA |
4234 | fprintf_filtered (stream, " [0x%s]>", |
4235 | phex_nz (to_underlying (type_die), 0)); | |
5e44ecb3 TT |
4236 | } |
4237 | } | |
4238 | break; | |
2bda9cc5 | 4239 | |
216f72a1 | 4240 | case DW_OP_entry_value: |
2bda9cc5 | 4241 | case DW_OP_GNU_entry_value: |
f664829e | 4242 | data = safe_read_uleb128 (data, end, &ul); |
2bda9cc5 JK |
4243 | fputc_filtered ('\n', stream); |
4244 | disassemble_dwarf_expression (stream, arch, addr_size, offset_size, | |
4245 | start, data, data + ul, indent + 2, | |
4246 | all, per_cu); | |
4247 | data += ul; | |
4248 | continue; | |
49f6c839 | 4249 | |
a24f71ab JK |
4250 | case DW_OP_GNU_parameter_ref: |
4251 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4252 | data += 4; | |
4253 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4254 | break; | |
4255 | ||
49f6c839 DE |
4256 | case DW_OP_GNU_addr_index: |
4257 | data = safe_read_uleb128 (data, end, &ul); | |
4258 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4259 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); | |
4260 | break; | |
4261 | case DW_OP_GNU_const_index: | |
4262 | data = safe_read_uleb128 (data, end, &ul); | |
4263 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4264 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4265 | break; | |
9eae7c52 TT |
4266 | } |
4267 | ||
4268 | fprintf_filtered (stream, "\n"); | |
4269 | } | |
c3228f12 | 4270 | |
08922a10 | 4271 | return data; |
4c2df51b DJ |
4272 | } |
4273 | ||
08922a10 SS |
4274 | /* Describe a single location, which may in turn consist of multiple |
4275 | pieces. */ | |
a55cc764 | 4276 | |
08922a10 SS |
4277 | static void |
4278 | locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr, | |
0d45f56e | 4279 | struct ui_file *stream, |
56eb65bd | 4280 | const gdb_byte *data, size_t size, |
9eae7c52 | 4281 | struct objfile *objfile, unsigned int addr_size, |
5e44ecb3 | 4282 | int offset_size, struct dwarf2_per_cu_data *per_cu) |
08922a10 | 4283 | { |
0d45f56e | 4284 | const gdb_byte *end = data + size; |
9eae7c52 | 4285 | int first_piece = 1, bad = 0; |
08922a10 | 4286 | |
08922a10 SS |
4287 | while (data < end) |
4288 | { | |
9eae7c52 TT |
4289 | const gdb_byte *here = data; |
4290 | int disassemble = 1; | |
4291 | ||
4292 | if (first_piece) | |
4293 | first_piece = 0; | |
4294 | else | |
4295 | fprintf_filtered (stream, _(", and ")); | |
08922a10 | 4296 | |
b4f54984 | 4297 | if (!dwarf_always_disassemble) |
9eae7c52 | 4298 | { |
3e43a32a | 4299 | data = locexpr_describe_location_piece (symbol, stream, |
49f6c839 | 4300 | addr, objfile, per_cu, |
9eae7c52 TT |
4301 | data, end, addr_size); |
4302 | /* If we printed anything, or if we have an empty piece, | |
4303 | then don't disassemble. */ | |
4304 | if (data != here | |
4305 | || data[0] == DW_OP_piece | |
4306 | || data[0] == DW_OP_bit_piece) | |
4307 | disassemble = 0; | |
08922a10 | 4308 | } |
9eae7c52 | 4309 | if (disassemble) |
2bda9cc5 JK |
4310 | { |
4311 | fprintf_filtered (stream, _("a complex DWARF expression:\n")); | |
4312 | data = disassemble_dwarf_expression (stream, | |
4313 | get_objfile_arch (objfile), | |
4314 | addr_size, offset_size, data, | |
4315 | data, end, 0, | |
b4f54984 | 4316 | dwarf_always_disassemble, |
2bda9cc5 JK |
4317 | per_cu); |
4318 | } | |
9eae7c52 TT |
4319 | |
4320 | if (data < end) | |
08922a10 | 4321 | { |
9eae7c52 | 4322 | int empty = data == here; |
08922a10 | 4323 | |
9eae7c52 TT |
4324 | if (disassemble) |
4325 | fprintf_filtered (stream, " "); | |
4326 | if (data[0] == DW_OP_piece) | |
4327 | { | |
9fccedf7 | 4328 | uint64_t bytes; |
08922a10 | 4329 | |
f664829e | 4330 | data = safe_read_uleb128 (data + 1, end, &bytes); |
08922a10 | 4331 | |
9eae7c52 TT |
4332 | if (empty) |
4333 | fprintf_filtered (stream, _("an empty %s-byte piece"), | |
4334 | pulongest (bytes)); | |
4335 | else | |
4336 | fprintf_filtered (stream, _(" [%s-byte piece]"), | |
4337 | pulongest (bytes)); | |
4338 | } | |
4339 | else if (data[0] == DW_OP_bit_piece) | |
4340 | { | |
9fccedf7 | 4341 | uint64_t bits, offset; |
9eae7c52 | 4342 | |
f664829e DE |
4343 | data = safe_read_uleb128 (data + 1, end, &bits); |
4344 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4345 | |
4346 | if (empty) | |
4347 | fprintf_filtered (stream, | |
4348 | _("an empty %s-bit piece"), | |
4349 | pulongest (bits)); | |
4350 | else | |
4351 | fprintf_filtered (stream, | |
4352 | _(" [%s-bit piece, offset %s bits]"), | |
4353 | pulongest (bits), pulongest (offset)); | |
4354 | } | |
4355 | else | |
4356 | { | |
4357 | bad = 1; | |
4358 | break; | |
4359 | } | |
08922a10 SS |
4360 | } |
4361 | } | |
4362 | ||
4363 | if (bad || data > end) | |
4364 | error (_("Corrupted DWARF2 expression for \"%s\"."), | |
4365 | SYMBOL_PRINT_NAME (symbol)); | |
4366 | } | |
4367 | ||
4368 | /* Print a natural-language description of SYMBOL to STREAM. This | |
4369 | version is for a symbol with a single location. */ | |
a55cc764 | 4370 | |
08922a10 SS |
4371 | static void |
4372 | locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4373 | struct ui_file *stream) | |
4374 | { | |
9a3c8263 SM |
4375 | struct dwarf2_locexpr_baton *dlbaton |
4376 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
08922a10 SS |
4377 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4378 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4379 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
08922a10 | 4380 | |
3e43a32a MS |
4381 | locexpr_describe_location_1 (symbol, addr, stream, |
4382 | dlbaton->data, dlbaton->size, | |
5e44ecb3 TT |
4383 | objfile, addr_size, offset_size, |
4384 | dlbaton->per_cu); | |
08922a10 SS |
4385 | } |
4386 | ||
4387 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4388 | any necessary bytecode in AX. */ | |
a55cc764 | 4389 | |
0d53c4c4 | 4390 | static void |
40f4af28 SM |
4391 | locexpr_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax, |
4392 | struct axs_value *value) | |
a55cc764 | 4393 | { |
9a3c8263 SM |
4394 | struct dwarf2_locexpr_baton *dlbaton |
4395 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
3cf03773 | 4396 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
a55cc764 | 4397 | |
1d6edc3c | 4398 | if (dlbaton->size == 0) |
cabe9ab6 PA |
4399 | value->optimized_out = 1; |
4400 | else | |
40f4af28 SM |
4401 | dwarf2_compile_expr_to_ax (ax, value, addr_size, dlbaton->data, |
4402 | dlbaton->data + dlbaton->size, dlbaton->per_cu); | |
a55cc764 DJ |
4403 | } |
4404 | ||
bb2ec1b3 TT |
4405 | /* symbol_computed_ops 'generate_c_location' method. */ |
4406 | ||
4407 | static void | |
d7e74731 | 4408 | locexpr_generate_c_location (struct symbol *sym, string_file &stream, |
bb2ec1b3 TT |
4409 | struct gdbarch *gdbarch, |
4410 | unsigned char *registers_used, | |
4411 | CORE_ADDR pc, const char *result_name) | |
4412 | { | |
9a3c8263 SM |
4413 | struct dwarf2_locexpr_baton *dlbaton |
4414 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (sym); | |
bb2ec1b3 TT |
4415 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
4416 | ||
4417 | if (dlbaton->size == 0) | |
4418 | error (_("symbol \"%s\" is optimized out"), SYMBOL_NATURAL_NAME (sym)); | |
4419 | ||
4420 | compile_dwarf_expr_to_c (stream, result_name, | |
4421 | sym, pc, gdbarch, registers_used, addr_size, | |
4422 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4423 | dlbaton->per_cu); | |
4424 | } | |
4425 | ||
4c2df51b DJ |
4426 | /* The set of location functions used with the DWARF-2 expression |
4427 | evaluator. */ | |
768a979c | 4428 | const struct symbol_computed_ops dwarf2_locexpr_funcs = { |
4c2df51b | 4429 | locexpr_read_variable, |
e18b2753 | 4430 | locexpr_read_variable_at_entry, |
0b31a4bc | 4431 | locexpr_get_symbol_read_needs, |
4c2df51b | 4432 | locexpr_describe_location, |
f1e6e072 | 4433 | 0, /* location_has_loclist */ |
bb2ec1b3 TT |
4434 | locexpr_tracepoint_var_ref, |
4435 | locexpr_generate_c_location | |
4c2df51b | 4436 | }; |
0d53c4c4 DJ |
4437 | |
4438 | ||
4439 | /* Wrapper functions for location lists. These generally find | |
4440 | the appropriate location expression and call something above. */ | |
4441 | ||
4442 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
4443 | evaluator to calculate the location. */ | |
4444 | static struct value * | |
4445 | loclist_read_variable (struct symbol *symbol, struct frame_info *frame) | |
4446 | { | |
9a3c8263 SM |
4447 | struct dwarf2_loclist_baton *dlbaton |
4448 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
0d53c4c4 | 4449 | struct value *val; |
947bb88f | 4450 | const gdb_byte *data; |
b6b08ebf | 4451 | size_t size; |
8cf6f0b1 | 4452 | CORE_ADDR pc = frame ? get_frame_address_in_block (frame) : 0; |
0d53c4c4 | 4453 | |
8cf6f0b1 | 4454 | data = dwarf2_find_location_expression (dlbaton, &size, pc); |
1d6edc3c JK |
4455 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, data, size, |
4456 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4457 | |
4458 | return val; | |
4459 | } | |
4460 | ||
e18b2753 JK |
4461 | /* Read variable SYMBOL like loclist_read_variable at (callee) FRAME's function |
4462 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
4463 | will be thrown. | |
4464 | ||
4465 | Function always returns non-NULL value, it may be marked optimized out if | |
4466 | inferior frame information is not available. It throws NO_ENTRY_VALUE_ERROR | |
4467 | if it cannot resolve the parameter for any reason. */ | |
4468 | ||
4469 | static struct value * | |
4470 | loclist_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
4471 | { | |
9a3c8263 SM |
4472 | struct dwarf2_loclist_baton *dlbaton |
4473 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
4474 | const gdb_byte *data; |
4475 | size_t size; | |
4476 | CORE_ADDR pc; | |
4477 | ||
4478 | if (frame == NULL || !get_frame_func_if_available (frame, &pc)) | |
4479 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4480 | ||
4481 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4482 | if (data == NULL) | |
4483 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4484 | ||
4485 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, data, size); | |
4486 | } | |
4487 | ||
0b31a4bc TT |
4488 | /* Implementation of get_symbol_read_needs from |
4489 | symbol_computed_ops. */ | |
4490 | ||
4491 | static enum symbol_needs_kind | |
4492 | loclist_symbol_needs (struct symbol *symbol) | |
0d53c4c4 DJ |
4493 | { |
4494 | /* If there's a location list, then assume we need to have a frame | |
4495 | to choose the appropriate location expression. With tracking of | |
4496 | global variables this is not necessarily true, but such tracking | |
4497 | is disabled in GCC at the moment until we figure out how to | |
4498 | represent it. */ | |
4499 | ||
0b31a4bc | 4500 | return SYMBOL_NEEDS_FRAME; |
0d53c4c4 DJ |
4501 | } |
4502 | ||
08922a10 SS |
4503 | /* Print a natural-language description of SYMBOL to STREAM. This |
4504 | version applies when there is a list of different locations, each | |
4505 | with a specified address range. */ | |
4506 | ||
4507 | static void | |
4508 | loclist_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4509 | struct ui_file *stream) | |
0d53c4c4 | 4510 | { |
9a3c8263 SM |
4511 | struct dwarf2_loclist_baton *dlbaton |
4512 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4513 | const gdb_byte *loc_ptr, *buf_end; |
08922a10 SS |
4514 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4515 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
4516 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
4517 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4518 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
d4a087c7 | 4519 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
08922a10 | 4520 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 4521 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); |
08922a10 | 4522 | CORE_ADDR base_address = dlbaton->base_address + base_offset; |
f664829e | 4523 | int done = 0; |
08922a10 SS |
4524 | |
4525 | loc_ptr = dlbaton->data; | |
4526 | buf_end = dlbaton->data + dlbaton->size; | |
4527 | ||
9eae7c52 | 4528 | fprintf_filtered (stream, _("multi-location:\n")); |
08922a10 SS |
4529 | |
4530 | /* Iterate through locations until we run out. */ | |
f664829e | 4531 | while (!done) |
08922a10 | 4532 | { |
f664829e DE |
4533 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
4534 | int length; | |
4535 | enum debug_loc_kind kind; | |
4536 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
4537 | ||
4538 | if (dlbaton->from_dwo) | |
4539 | kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu, | |
4540 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 4541 | &low, &high, byte_order); |
d4a087c7 | 4542 | else |
f664829e DE |
4543 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
4544 | &low, &high, | |
4545 | byte_order, addr_size, | |
4546 | signed_addr_p); | |
4547 | loc_ptr = new_ptr; | |
4548 | switch (kind) | |
08922a10 | 4549 | { |
f664829e DE |
4550 | case DEBUG_LOC_END_OF_LIST: |
4551 | done = 1; | |
4552 | continue; | |
4553 | case DEBUG_LOC_BASE_ADDRESS: | |
d4a087c7 | 4554 | base_address = high + base_offset; |
9eae7c52 | 4555 | fprintf_filtered (stream, _(" Base address %s"), |
08922a10 | 4556 | paddress (gdbarch, base_address)); |
08922a10 | 4557 | continue; |
3771a44c DE |
4558 | case DEBUG_LOC_START_END: |
4559 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
4560 | break; |
4561 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
4562 | case DEBUG_LOC_INVALID_ENTRY: | |
4563 | error (_("Corrupted DWARF expression for symbol \"%s\"."), | |
4564 | SYMBOL_PRINT_NAME (symbol)); | |
4565 | default: | |
4566 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
08922a10 SS |
4567 | } |
4568 | ||
08922a10 SS |
4569 | /* Otherwise, a location expression entry. */ |
4570 | low += base_address; | |
4571 | high += base_address; | |
4572 | ||
3e29f34a MR |
4573 | low = gdbarch_adjust_dwarf2_addr (gdbarch, low); |
4574 | high = gdbarch_adjust_dwarf2_addr (gdbarch, high); | |
4575 | ||
08922a10 SS |
4576 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); |
4577 | loc_ptr += 2; | |
4578 | ||
08922a10 SS |
4579 | /* (It would improve readability to print only the minimum |
4580 | necessary digits of the second number of the range.) */ | |
9eae7c52 | 4581 | fprintf_filtered (stream, _(" Range %s-%s: "), |
08922a10 SS |
4582 | paddress (gdbarch, low), paddress (gdbarch, high)); |
4583 | ||
4584 | /* Now describe this particular location. */ | |
4585 | locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length, | |
5e44ecb3 TT |
4586 | objfile, addr_size, offset_size, |
4587 | dlbaton->per_cu); | |
9eae7c52 TT |
4588 | |
4589 | fprintf_filtered (stream, "\n"); | |
08922a10 SS |
4590 | |
4591 | loc_ptr += length; | |
4592 | } | |
0d53c4c4 DJ |
4593 | } |
4594 | ||
4595 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4596 | any necessary bytecode in AX. */ | |
4597 | static void | |
40f4af28 SM |
4598 | loclist_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax, |
4599 | struct axs_value *value) | |
0d53c4c4 | 4600 | { |
9a3c8263 SM |
4601 | struct dwarf2_loclist_baton *dlbaton |
4602 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4603 | const gdb_byte *data; |
b6b08ebf | 4604 | size_t size; |
3cf03773 | 4605 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
0d53c4c4 | 4606 | |
8cf6f0b1 | 4607 | data = dwarf2_find_location_expression (dlbaton, &size, ax->scope); |
1d6edc3c | 4608 | if (size == 0) |
cabe9ab6 PA |
4609 | value->optimized_out = 1; |
4610 | else | |
40f4af28 | 4611 | dwarf2_compile_expr_to_ax (ax, value, addr_size, data, data + size, |
9f6f94ff | 4612 | dlbaton->per_cu); |
0d53c4c4 DJ |
4613 | } |
4614 | ||
bb2ec1b3 TT |
4615 | /* symbol_computed_ops 'generate_c_location' method. */ |
4616 | ||
4617 | static void | |
d7e74731 | 4618 | loclist_generate_c_location (struct symbol *sym, string_file &stream, |
bb2ec1b3 TT |
4619 | struct gdbarch *gdbarch, |
4620 | unsigned char *registers_used, | |
4621 | CORE_ADDR pc, const char *result_name) | |
4622 | { | |
9a3c8263 SM |
4623 | struct dwarf2_loclist_baton *dlbaton |
4624 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (sym); | |
bb2ec1b3 TT |
4625 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
4626 | const gdb_byte *data; | |
4627 | size_t size; | |
4628 | ||
4629 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4630 | if (size == 0) | |
4631 | error (_("symbol \"%s\" is optimized out"), SYMBOL_NATURAL_NAME (sym)); | |
4632 | ||
4633 | compile_dwarf_expr_to_c (stream, result_name, | |
4634 | sym, pc, gdbarch, registers_used, addr_size, | |
4635 | data, data + size, | |
4636 | dlbaton->per_cu); | |
4637 | } | |
4638 | ||
0d53c4c4 DJ |
4639 | /* The set of location functions used with the DWARF-2 expression |
4640 | evaluator and location lists. */ | |
768a979c | 4641 | const struct symbol_computed_ops dwarf2_loclist_funcs = { |
0d53c4c4 | 4642 | loclist_read_variable, |
e18b2753 | 4643 | loclist_read_variable_at_entry, |
0b31a4bc | 4644 | loclist_symbol_needs, |
0d53c4c4 | 4645 | loclist_describe_location, |
f1e6e072 | 4646 | 1, /* location_has_loclist */ |
bb2ec1b3 TT |
4647 | loclist_tracepoint_var_ref, |
4648 | loclist_generate_c_location | |
0d53c4c4 | 4649 | }; |
8e3b41a9 JK |
4650 | |
4651 | void | |
4652 | _initialize_dwarf2loc (void) | |
4653 | { | |
ccce17b0 YQ |
4654 | add_setshow_zuinteger_cmd ("entry-values", class_maintenance, |
4655 | &entry_values_debug, | |
4656 | _("Set entry values and tail call frames " | |
4657 | "debugging."), | |
4658 | _("Show entry values and tail call frames " | |
4659 | "debugging."), | |
4660 | _("When non-zero, the process of determining " | |
4661 | "parameter values from function entry point " | |
4662 | "and tail call frames will be printed."), | |
4663 | NULL, | |
4664 | show_entry_values_debug, | |
4665 | &setdebuglist, &showdebuglist); | |
ad06383f AA |
4666 | |
4667 | #if GDB_SELF_TEST | |
1526853e | 4668 | selftests::register_test ("copy_bitwise", selftests::copy_bitwise_tests); |
ad06383f | 4669 | #endif |
8e3b41a9 | 4670 | } |