Commit | Line | Data |
---|---|---|
4c2df51b | 1 | /* DWARF 2 location expression support for GDB. |
feb13ab0 | 2 | |
42a4f53d | 3 | Copyright (C) 2003-2019 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" | |
d55e5aa6 TT |
23 | |
24 | /* Standard C++ includes. */ | |
25 | #include <algorithm> | |
26 | #include <unordered_set> | |
27 | #include <vector> | |
28 | ||
29 | /* Local non-gdb includes. */ | |
a55cc764 | 30 | #include "ax-gdb.h" |
d55e5aa6 | 31 | #include "ax.h" |
edb3359d | 32 | #include "block.h" |
d55e5aa6 TT |
33 | #include "common/byte-vector.h" |
34 | #include "common/selftest.h" | |
35 | #include "common/underlying.h" | |
36 | #include "compile/compile.h" | |
0fde2c53 | 37 | #include "complaints.h" |
d55e5aa6 | 38 | #include "dwarf2-frame.h" |
fa8f86ff | 39 | #include "dwarf2.h" |
4c2df51b DJ |
40 | #include "dwarf2expr.h" |
41 | #include "dwarf2loc.h" | |
d55e5aa6 TT |
42 | #include "frame.h" |
43 | #include "gdbcmd.h" | |
44 | #include "gdbcore.h" | |
45 | #include "inferior.h" | |
46 | #include "objfiles.h" | |
47 | #include "regcache.h" | |
48 | #include "target.h" | |
49 | #include "ui-out.h" | |
50 | #include "value.h" | |
4c2df51b | 51 | |
b4f54984 | 52 | extern int dwarf_always_disassemble; |
9eae7c52 | 53 | |
1632a688 JK |
54 | static struct value *dwarf2_evaluate_loc_desc_full (struct type *type, |
55 | struct frame_info *frame, | |
56 | const gdb_byte *data, | |
56eb65bd SP |
57 | size_t size, |
58 | struct dwarf2_per_cu_data *per_cu, | |
7942e96e AA |
59 | struct type *subobj_type, |
60 | LONGEST subobj_byte_offset); | |
8cf6f0b1 | 61 | |
192ca6d8 TT |
62 | static struct call_site_parameter *dwarf_expr_reg_to_entry_parameter |
63 | (struct frame_info *frame, | |
64 | enum call_site_parameter_kind kind, | |
65 | union call_site_parameter_u kind_u, | |
66 | struct dwarf2_per_cu_data **per_cu_return); | |
67 | ||
a6b786da KB |
68 | static struct value *indirect_synthetic_pointer |
69 | (sect_offset die, LONGEST byte_offset, | |
70 | struct dwarf2_per_cu_data *per_cu, | |
71 | struct frame_info *frame, | |
e4a62c65 | 72 | struct type *type, bool resolve_abstract_p = false); |
a6b786da | 73 | |
f664829e DE |
74 | /* Until these have formal names, we define these here. |
75 | ref: http://gcc.gnu.org/wiki/DebugFission | |
76 | Each entry in .debug_loc.dwo begins with a byte that describes the entry, | |
77 | and is then followed by data specific to that entry. */ | |
78 | ||
79 | enum debug_loc_kind | |
80 | { | |
81 | /* Indicates the end of the list of entries. */ | |
82 | DEBUG_LOC_END_OF_LIST = 0, | |
83 | ||
84 | /* This is followed by an unsigned LEB128 number that is an index into | |
85 | .debug_addr and specifies the base address for all following entries. */ | |
86 | DEBUG_LOC_BASE_ADDRESS = 1, | |
87 | ||
88 | /* This is followed by two unsigned LEB128 numbers that are indices into | |
89 | .debug_addr and specify the beginning and ending addresses, and then | |
90 | a normal location expression as in .debug_loc. */ | |
3771a44c DE |
91 | DEBUG_LOC_START_END = 2, |
92 | ||
93 | /* This is followed by an unsigned LEB128 number that is an index into | |
94 | .debug_addr and specifies the beginning address, and a 4 byte unsigned | |
95 | number that specifies the length, and then a normal location expression | |
96 | as in .debug_loc. */ | |
97 | DEBUG_LOC_START_LENGTH = 3, | |
f664829e DE |
98 | |
99 | /* An internal value indicating there is insufficient data. */ | |
100 | DEBUG_LOC_BUFFER_OVERFLOW = -1, | |
101 | ||
102 | /* An internal value indicating an invalid kind of entry was found. */ | |
103 | DEBUG_LOC_INVALID_ENTRY = -2 | |
104 | }; | |
105 | ||
b6807d98 TT |
106 | /* Helper function which throws an error if a synthetic pointer is |
107 | invalid. */ | |
108 | ||
109 | static void | |
110 | invalid_synthetic_pointer (void) | |
111 | { | |
112 | error (_("access outside bounds of object " | |
113 | "referenced via synthetic pointer")); | |
114 | } | |
115 | ||
f664829e DE |
116 | /* Decode the addresses in a non-dwo .debug_loc entry. |
117 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
118 | The encoded low,high addresses are return in *LOW,*HIGH. | |
119 | The result indicates the kind of entry found. */ | |
120 | ||
121 | static enum debug_loc_kind | |
122 | decode_debug_loc_addresses (const gdb_byte *loc_ptr, const gdb_byte *buf_end, | |
123 | const gdb_byte **new_ptr, | |
124 | CORE_ADDR *low, CORE_ADDR *high, | |
125 | enum bfd_endian byte_order, | |
126 | unsigned int addr_size, | |
127 | int signed_addr_p) | |
128 | { | |
129 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); | |
130 | ||
131 | if (buf_end - loc_ptr < 2 * addr_size) | |
132 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
133 | ||
134 | if (signed_addr_p) | |
135 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
136 | else | |
137 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
138 | loc_ptr += addr_size; | |
139 | ||
140 | if (signed_addr_p) | |
141 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
142 | else | |
143 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
144 | loc_ptr += addr_size; | |
145 | ||
146 | *new_ptr = loc_ptr; | |
147 | ||
148 | /* A base-address-selection entry. */ | |
149 | if ((*low & base_mask) == base_mask) | |
150 | return DEBUG_LOC_BASE_ADDRESS; | |
151 | ||
152 | /* An end-of-list entry. */ | |
153 | if (*low == 0 && *high == 0) | |
154 | return DEBUG_LOC_END_OF_LIST; | |
155 | ||
3771a44c | 156 | return DEBUG_LOC_START_END; |
f664829e DE |
157 | } |
158 | ||
43988095 JK |
159 | /* Decode the addresses in .debug_loclists entry. |
160 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
161 | The encoded low,high addresses are return in *LOW,*HIGH. | |
162 | The result indicates the kind of entry found. */ | |
163 | ||
164 | static enum debug_loc_kind | |
165 | decode_debug_loclists_addresses (struct dwarf2_per_cu_data *per_cu, | |
166 | const gdb_byte *loc_ptr, | |
167 | const gdb_byte *buf_end, | |
168 | const gdb_byte **new_ptr, | |
169 | CORE_ADDR *low, CORE_ADDR *high, | |
170 | enum bfd_endian byte_order, | |
171 | unsigned int addr_size, | |
172 | int signed_addr_p) | |
173 | { | |
174 | uint64_t u64; | |
175 | ||
176 | if (loc_ptr == buf_end) | |
177 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
178 | ||
179 | switch (*loc_ptr++) | |
180 | { | |
181 | case DW_LLE_end_of_list: | |
182 | *new_ptr = loc_ptr; | |
183 | return DEBUG_LOC_END_OF_LIST; | |
184 | case DW_LLE_base_address: | |
185 | if (loc_ptr + addr_size > buf_end) | |
186 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
187 | if (signed_addr_p) | |
188 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
189 | else | |
190 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
191 | loc_ptr += addr_size; | |
192 | *new_ptr = loc_ptr; | |
193 | return DEBUG_LOC_BASE_ADDRESS; | |
194 | case DW_LLE_offset_pair: | |
195 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
196 | if (loc_ptr == NULL) | |
197 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
198 | *low = u64; | |
199 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &u64); | |
200 | if (loc_ptr == NULL) | |
201 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
202 | *high = u64; | |
203 | *new_ptr = loc_ptr; | |
204 | return DEBUG_LOC_START_END; | |
205 | default: | |
206 | return DEBUG_LOC_INVALID_ENTRY; | |
207 | } | |
208 | } | |
209 | ||
f664829e DE |
210 | /* Decode the addresses in .debug_loc.dwo entry. |
211 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
212 | The encoded low,high addresses are return in *LOW,*HIGH. | |
213 | The result indicates the kind of entry found. */ | |
214 | ||
215 | static enum debug_loc_kind | |
216 | decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu, | |
217 | const gdb_byte *loc_ptr, | |
218 | const gdb_byte *buf_end, | |
219 | const gdb_byte **new_ptr, | |
3771a44c DE |
220 | CORE_ADDR *low, CORE_ADDR *high, |
221 | enum bfd_endian byte_order) | |
f664829e | 222 | { |
9fccedf7 | 223 | uint64_t low_index, high_index; |
f664829e DE |
224 | |
225 | if (loc_ptr == buf_end) | |
226 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
227 | ||
228 | switch (*loc_ptr++) | |
229 | { | |
43988095 | 230 | case DW_LLE_GNU_end_of_list_entry: |
f664829e DE |
231 | *new_ptr = loc_ptr; |
232 | return DEBUG_LOC_END_OF_LIST; | |
43988095 | 233 | case DW_LLE_GNU_base_address_selection_entry: |
f664829e DE |
234 | *low = 0; |
235 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
236 | if (loc_ptr == NULL) | |
237 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
238 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
239 | *new_ptr = loc_ptr; | |
240 | return DEBUG_LOC_BASE_ADDRESS; | |
43988095 | 241 | case DW_LLE_GNU_start_end_entry: |
f664829e DE |
242 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
243 | if (loc_ptr == NULL) | |
244 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
245 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
246 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
247 | if (loc_ptr == NULL) | |
248 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
249 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
250 | *new_ptr = loc_ptr; | |
3771a44c | 251 | return DEBUG_LOC_START_END; |
43988095 | 252 | case DW_LLE_GNU_start_length_entry: |
3771a44c DE |
253 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
254 | if (loc_ptr == NULL) | |
255 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
256 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
257 | if (loc_ptr + 4 > buf_end) | |
258 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
259 | *high = *low; | |
260 | *high += extract_unsigned_integer (loc_ptr, 4, byte_order); | |
261 | *new_ptr = loc_ptr + 4; | |
262 | return DEBUG_LOC_START_LENGTH; | |
f664829e DE |
263 | default: |
264 | return DEBUG_LOC_INVALID_ENTRY; | |
265 | } | |
266 | } | |
267 | ||
8cf6f0b1 | 268 | /* A function for dealing with location lists. Given a |
0d53c4c4 DJ |
269 | symbol baton (BATON) and a pc value (PC), find the appropriate |
270 | location expression, set *LOCEXPR_LENGTH, and return a pointer | |
271 | to the beginning of the expression. Returns NULL on failure. | |
272 | ||
273 | For now, only return the first matching location expression; there | |
274 | can be more than one in the list. */ | |
275 | ||
8cf6f0b1 TT |
276 | const gdb_byte * |
277 | dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton, | |
278 | size_t *locexpr_length, CORE_ADDR pc) | |
0d53c4c4 | 279 | { |
ae0d2f24 | 280 | struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu); |
f7fd4728 | 281 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
e17a4113 | 282 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
ae0d2f24 | 283 | unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu); |
d4a087c7 | 284 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
8edfa926 | 285 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 286 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (baton->per_cu); |
8edfa926 | 287 | CORE_ADDR base_address = baton->base_address + base_offset; |
f664829e | 288 | const gdb_byte *loc_ptr, *buf_end; |
0d53c4c4 DJ |
289 | |
290 | loc_ptr = baton->data; | |
291 | buf_end = baton->data + baton->size; | |
292 | ||
293 | while (1) | |
294 | { | |
f664829e DE |
295 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
296 | int length; | |
297 | enum debug_loc_kind kind; | |
298 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
299 | ||
300 | if (baton->from_dwo) | |
301 | kind = decode_debug_loc_dwo_addresses (baton->per_cu, | |
302 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 303 | &low, &high, byte_order); |
43988095 | 304 | else if (dwarf2_version (baton->per_cu) < 5) |
f664829e DE |
305 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
306 | &low, &high, | |
307 | byte_order, addr_size, | |
308 | signed_addr_p); | |
43988095 JK |
309 | else |
310 | kind = decode_debug_loclists_addresses (baton->per_cu, | |
311 | loc_ptr, buf_end, &new_ptr, | |
312 | &low, &high, byte_order, | |
313 | addr_size, signed_addr_p); | |
314 | ||
f664829e DE |
315 | loc_ptr = new_ptr; |
316 | switch (kind) | |
1d6edc3c | 317 | { |
f664829e | 318 | case DEBUG_LOC_END_OF_LIST: |
1d6edc3c JK |
319 | *locexpr_length = 0; |
320 | return NULL; | |
f664829e DE |
321 | case DEBUG_LOC_BASE_ADDRESS: |
322 | base_address = high + base_offset; | |
323 | continue; | |
3771a44c DE |
324 | case DEBUG_LOC_START_END: |
325 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
326 | break; |
327 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
328 | case DEBUG_LOC_INVALID_ENTRY: | |
329 | error (_("dwarf2_find_location_expression: " | |
330 | "Corrupted DWARF expression.")); | |
331 | default: | |
332 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
1d6edc3c | 333 | } |
b5758fe4 | 334 | |
bed911e5 | 335 | /* Otherwise, a location expression entry. |
8ddd5a6c DE |
336 | If the entry is from a DWO, don't add base address: the entry is from |
337 | .debug_addr which already has the DWARF "base address". We still add | |
338 | base_offset in case we're debugging a PIE executable. */ | |
339 | if (baton->from_dwo) | |
340 | { | |
341 | low += base_offset; | |
342 | high += base_offset; | |
343 | } | |
344 | else | |
bed911e5 DE |
345 | { |
346 | low += base_address; | |
347 | high += base_address; | |
348 | } | |
0d53c4c4 | 349 | |
43988095 JK |
350 | if (dwarf2_version (baton->per_cu) < 5) |
351 | { | |
352 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); | |
353 | loc_ptr += 2; | |
354 | } | |
355 | else | |
356 | { | |
357 | unsigned int bytes_read; | |
358 | ||
359 | length = read_unsigned_leb128 (NULL, loc_ptr, &bytes_read); | |
360 | loc_ptr += bytes_read; | |
361 | } | |
0d53c4c4 | 362 | |
e18b2753 JK |
363 | if (low == high && pc == low) |
364 | { | |
365 | /* This is entry PC record present only at entry point | |
366 | of a function. Verify it is really the function entry point. */ | |
367 | ||
3977b71f | 368 | const struct block *pc_block = block_for_pc (pc); |
e18b2753 JK |
369 | struct symbol *pc_func = NULL; |
370 | ||
371 | if (pc_block) | |
372 | pc_func = block_linkage_function (pc_block); | |
373 | ||
2b1ffcfd | 374 | if (pc_func && pc == BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (pc_func))) |
e18b2753 JK |
375 | { |
376 | *locexpr_length = length; | |
377 | return loc_ptr; | |
378 | } | |
379 | } | |
380 | ||
0d53c4c4 DJ |
381 | if (pc >= low && pc < high) |
382 | { | |
383 | *locexpr_length = length; | |
384 | return loc_ptr; | |
385 | } | |
386 | ||
387 | loc_ptr += length; | |
388 | } | |
389 | } | |
390 | ||
4c2df51b DJ |
391 | /* This is the baton used when performing dwarf2 expression |
392 | evaluation. */ | |
393 | struct dwarf_expr_baton | |
394 | { | |
395 | struct frame_info *frame; | |
17ea53c3 | 396 | struct dwarf2_per_cu_data *per_cu; |
08412b07 | 397 | CORE_ADDR obj_address; |
4c2df51b DJ |
398 | }; |
399 | ||
f1e6e072 TT |
400 | /* Implement find_frame_base_location method for LOC_BLOCK functions using |
401 | DWARF expression for its DW_AT_frame_base. */ | |
402 | ||
403 | static void | |
404 | locexpr_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
405 | const gdb_byte **start, size_t *length) | |
406 | { | |
9a3c8263 SM |
407 | struct dwarf2_locexpr_baton *symbaton |
408 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
409 | |
410 | *length = symbaton->size; | |
411 | *start = symbaton->data; | |
412 | } | |
413 | ||
7d1c9c9b JB |
414 | /* Implement the struct symbol_block_ops::get_frame_base method for |
415 | LOC_BLOCK functions using a DWARF expression as its DW_AT_frame_base. */ | |
63e43d3a PMR |
416 | |
417 | static CORE_ADDR | |
7d1c9c9b | 418 | locexpr_get_frame_base (struct symbol *framefunc, struct frame_info *frame) |
63e43d3a PMR |
419 | { |
420 | struct gdbarch *gdbarch; | |
421 | struct type *type; | |
422 | struct dwarf2_locexpr_baton *dlbaton; | |
423 | const gdb_byte *start; | |
424 | size_t length; | |
425 | struct value *result; | |
426 | ||
427 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
428 | Thus, it's supposed to provide the find_frame_base_location method as | |
429 | well. */ | |
430 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
431 | ||
432 | gdbarch = get_frame_arch (frame); | |
433 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 434 | dlbaton = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); |
63e43d3a PMR |
435 | |
436 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
437 | (framefunc, get_frame_pc (frame), &start, &length); | |
438 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
439 | dlbaton->per_cu); | |
440 | ||
441 | /* The DW_AT_frame_base attribute contains a location description which | |
442 | computes the base address itself. However, the call to | |
443 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
444 | that address. The frame base address is thus this variable's | |
445 | address. */ | |
446 | return value_address (result); | |
447 | } | |
448 | ||
f1e6e072 TT |
449 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
450 | function uses DWARF expression for its DW_AT_frame_base. */ | |
451 | ||
452 | const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs = | |
453 | { | |
63e43d3a | 454 | locexpr_find_frame_base_location, |
7d1c9c9b | 455 | locexpr_get_frame_base |
f1e6e072 TT |
456 | }; |
457 | ||
458 | /* Implement find_frame_base_location method for LOC_BLOCK functions using | |
459 | DWARF location list for its DW_AT_frame_base. */ | |
460 | ||
461 | static void | |
462 | loclist_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
463 | const gdb_byte **start, size_t *length) | |
464 | { | |
9a3c8263 SM |
465 | struct dwarf2_loclist_baton *symbaton |
466 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
467 | |
468 | *start = dwarf2_find_location_expression (symbaton, length, pc); | |
469 | } | |
470 | ||
7d1c9c9b JB |
471 | /* Implement the struct symbol_block_ops::get_frame_base method for |
472 | LOC_BLOCK functions using a DWARF location list as its DW_AT_frame_base. */ | |
473 | ||
474 | static CORE_ADDR | |
475 | loclist_get_frame_base (struct symbol *framefunc, struct frame_info *frame) | |
476 | { | |
477 | struct gdbarch *gdbarch; | |
478 | struct type *type; | |
479 | struct dwarf2_loclist_baton *dlbaton; | |
480 | const gdb_byte *start; | |
481 | size_t length; | |
482 | struct value *result; | |
483 | ||
484 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
485 | Thus, it's supposed to provide the find_frame_base_location method as | |
486 | well. */ | |
487 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
488 | ||
489 | gdbarch = get_frame_arch (frame); | |
490 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 491 | dlbaton = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); |
7d1c9c9b JB |
492 | |
493 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
494 | (framefunc, get_frame_pc (frame), &start, &length); | |
495 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
496 | dlbaton->per_cu); | |
497 | ||
498 | /* The DW_AT_frame_base attribute contains a location description which | |
499 | computes the base address itself. However, the call to | |
500 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
501 | that address. The frame base address is thus this variable's | |
502 | address. */ | |
503 | return value_address (result); | |
504 | } | |
505 | ||
f1e6e072 TT |
506 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
507 | function uses DWARF location list for its DW_AT_frame_base. */ | |
508 | ||
509 | const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs = | |
510 | { | |
63e43d3a | 511 | loclist_find_frame_base_location, |
7d1c9c9b | 512 | loclist_get_frame_base |
f1e6e072 TT |
513 | }; |
514 | ||
af945b75 TT |
515 | /* See dwarf2loc.h. */ |
516 | ||
517 | void | |
518 | func_get_frame_base_dwarf_block (struct symbol *framefunc, CORE_ADDR pc, | |
519 | const gdb_byte **start, size_t *length) | |
0936ad1d | 520 | { |
f1e6e072 | 521 | if (SYMBOL_BLOCK_OPS (framefunc) != NULL) |
0d53c4c4 | 522 | { |
f1e6e072 | 523 | const struct symbol_block_ops *ops_block = SYMBOL_BLOCK_OPS (framefunc); |
22c6caba | 524 | |
f1e6e072 | 525 | ops_block->find_frame_base_location (framefunc, pc, start, length); |
0d53c4c4 DJ |
526 | } |
527 | else | |
f1e6e072 | 528 | *length = 0; |
0d53c4c4 | 529 | |
1d6edc3c | 530 | if (*length == 0) |
8a3fe4f8 | 531 | error (_("Could not find the frame base for \"%s\"."), |
0d53c4c4 | 532 | SYMBOL_NATURAL_NAME (framefunc)); |
4c2df51b DJ |
533 | } |
534 | ||
4c2df51b | 535 | static CORE_ADDR |
192ca6d8 | 536 | get_frame_pc_for_per_cu_dwarf_call (void *baton) |
4c2df51b | 537 | { |
192ca6d8 | 538 | dwarf_expr_context *ctx = (dwarf_expr_context *) baton; |
4c2df51b | 539 | |
192ca6d8 | 540 | return ctx->get_frame_pc (); |
4c2df51b DJ |
541 | } |
542 | ||
5c631832 | 543 | static void |
b64f50a1 | 544 | per_cu_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset, |
192ca6d8 | 545 | struct dwarf2_per_cu_data *per_cu) |
5c631832 JK |
546 | { |
547 | struct dwarf2_locexpr_baton block; | |
548 | ||
192ca6d8 TT |
549 | block = dwarf2_fetch_die_loc_cu_off (die_offset, per_cu, |
550 | get_frame_pc_for_per_cu_dwarf_call, | |
551 | ctx); | |
5c631832 JK |
552 | |
553 | /* DW_OP_call_ref is currently not supported. */ | |
554 | gdb_assert (block.per_cu == per_cu); | |
555 | ||
595d2e30 | 556 | ctx->eval (block.data, block.size); |
5c631832 JK |
557 | } |
558 | ||
a6b786da KB |
559 | /* Given context CTX, section offset SECT_OFF, and compilation unit |
560 | data PER_CU, execute the "variable value" operation on the DIE | |
561 | found at SECT_OFF. */ | |
562 | ||
563 | static struct value * | |
564 | sect_variable_value (struct dwarf_expr_context *ctx, sect_offset sect_off, | |
565 | struct dwarf2_per_cu_data *per_cu) | |
566 | { | |
567 | struct type *die_type = dwarf2_fetch_die_type_sect_off (sect_off, per_cu); | |
568 | ||
569 | if (die_type == NULL) | |
570 | error (_("Bad DW_OP_GNU_variable_value DIE.")); | |
571 | ||
572 | /* Note: Things still work when the following test is removed. This | |
573 | test and error is here to conform to the proposed specification. */ | |
574 | if (TYPE_CODE (die_type) != TYPE_CODE_INT | |
575 | && TYPE_CODE (die_type) != TYPE_CODE_PTR) | |
576 | error (_("Type of DW_OP_GNU_variable_value DIE must be an integer or pointer.")); | |
577 | ||
578 | struct type *type = lookup_pointer_type (die_type); | |
579 | struct frame_info *frame = get_selected_frame (_("No frame selected.")); | |
e4a62c65 | 580 | return indirect_synthetic_pointer (sect_off, 0, per_cu, frame, type, true); |
a6b786da KB |
581 | } |
582 | ||
192ca6d8 | 583 | class dwarf_evaluate_loc_desc : public dwarf_expr_context |
5c631832 | 584 | { |
192ca6d8 | 585 | public: |
5c631832 | 586 | |
192ca6d8 TT |
587 | struct frame_info *frame; |
588 | struct dwarf2_per_cu_data *per_cu; | |
589 | CORE_ADDR obj_address; | |
5c631832 | 590 | |
192ca6d8 TT |
591 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for |
592 | the frame in BATON. */ | |
8a9b8146 | 593 | |
632e107b | 594 | CORE_ADDR get_frame_cfa () override |
192ca6d8 TT |
595 | { |
596 | return dwarf2_frame_cfa (frame); | |
597 | } | |
8a9b8146 | 598 | |
192ca6d8 TT |
599 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for |
600 | the frame in BATON. */ | |
601 | ||
632e107b | 602 | CORE_ADDR get_frame_pc () override |
192ca6d8 TT |
603 | { |
604 | return get_frame_address_in_block (frame); | |
605 | } | |
606 | ||
607 | /* Using the objfile specified in BATON, find the address for the | |
608 | current thread's thread-local storage with offset OFFSET. */ | |
632e107b | 609 | CORE_ADDR get_tls_address (CORE_ADDR offset) override |
192ca6d8 TT |
610 | { |
611 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); | |
612 | ||
613 | return target_translate_tls_address (objfile, offset); | |
614 | } | |
615 | ||
616 | /* Helper interface of per_cu_dwarf_call for | |
617 | dwarf2_evaluate_loc_desc. */ | |
618 | ||
632e107b | 619 | void dwarf_call (cu_offset die_offset) override |
192ca6d8 TT |
620 | { |
621 | per_cu_dwarf_call (this, die_offset, per_cu); | |
622 | } | |
623 | ||
a6b786da KB |
624 | /* Helper interface of sect_variable_value for |
625 | dwarf2_evaluate_loc_desc. */ | |
626 | ||
627 | struct value *dwarf_variable_value (sect_offset sect_off) override | |
628 | { | |
629 | return sect_variable_value (this, sect_off, per_cu); | |
630 | } | |
631 | ||
632e107b | 632 | struct type *get_base_type (cu_offset die_offset, int size) override |
192ca6d8 | 633 | { |
7d5697f9 TT |
634 | struct type *result = dwarf2_get_die_type (die_offset, per_cu); |
635 | if (result == NULL) | |
216f72a1 | 636 | error (_("Could not find type for DW_OP_const_type")); |
7d5697f9 | 637 | if (size != 0 && TYPE_LENGTH (result) != size) |
216f72a1 | 638 | error (_("DW_OP_const_type has different sizes for type and data")); |
7d5697f9 | 639 | return result; |
192ca6d8 TT |
640 | } |
641 | ||
642 | /* Callback function for dwarf2_evaluate_loc_desc. | |
643 | Fetch the address indexed by DW_OP_GNU_addr_index. */ | |
644 | ||
632e107b | 645 | CORE_ADDR get_addr_index (unsigned int index) override |
192ca6d8 TT |
646 | { |
647 | return dwarf2_read_addr_index (per_cu, index); | |
648 | } | |
649 | ||
650 | /* Callback function for get_object_address. Return the address of the VLA | |
651 | object. */ | |
652 | ||
632e107b | 653 | CORE_ADDR get_object_address () override |
192ca6d8 TT |
654 | { |
655 | if (obj_address == 0) | |
656 | error (_("Location address is not set.")); | |
657 | return obj_address; | |
658 | } | |
659 | ||
660 | /* Execute DWARF block of call_site_parameter which matches KIND and | |
661 | KIND_U. Choose DEREF_SIZE value of that parameter. Search | |
662 | caller of this objects's frame. | |
663 | ||
664 | The caller can be from a different CU - per_cu_dwarf_call | |
665 | implementation can be more simple as it does not support cross-CU | |
666 | DWARF executions. */ | |
667 | ||
668 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
669 | union call_site_parameter_u kind_u, | |
632e107b | 670 | int deref_size) override |
192ca6d8 TT |
671 | { |
672 | struct frame_info *caller_frame; | |
673 | struct dwarf2_per_cu_data *caller_per_cu; | |
192ca6d8 TT |
674 | struct call_site_parameter *parameter; |
675 | const gdb_byte *data_src; | |
676 | size_t size; | |
677 | ||
678 | caller_frame = get_prev_frame (frame); | |
679 | ||
680 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, | |
681 | &caller_per_cu); | |
682 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
683 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
684 | ||
685 | /* DEREF_SIZE size is not verified here. */ | |
686 | if (data_src == NULL) | |
687 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 688 | _("Cannot resolve DW_AT_call_data_value")); |
192ca6d8 | 689 | |
7d5697f9 TT |
690 | scoped_restore save_frame = make_scoped_restore (&this->frame, |
691 | caller_frame); | |
692 | scoped_restore save_per_cu = make_scoped_restore (&this->per_cu, | |
693 | caller_per_cu); | |
694 | scoped_restore save_obj_addr = make_scoped_restore (&this->obj_address, | |
695 | (CORE_ADDR) 0); | |
192ca6d8 TT |
696 | |
697 | scoped_restore save_arch = make_scoped_restore (&this->gdbarch); | |
698 | this->gdbarch | |
7d5697f9 | 699 | = get_objfile_arch (dwarf2_per_cu_objfile (per_cu)); |
192ca6d8 | 700 | scoped_restore save_addr_size = make_scoped_restore (&this->addr_size); |
7d5697f9 | 701 | this->addr_size = dwarf2_per_cu_addr_size (per_cu); |
192ca6d8 | 702 | scoped_restore save_offset = make_scoped_restore (&this->offset); |
7d5697f9 | 703 | this->offset = dwarf2_per_cu_text_offset (per_cu); |
192ca6d8 TT |
704 | |
705 | this->eval (data_src, size); | |
706 | } | |
707 | ||
708 | /* Using the frame specified in BATON, find the location expression | |
709 | describing the frame base. Return a pointer to it in START and | |
710 | its length in LENGTH. */ | |
632e107b | 711 | void get_frame_base (const gdb_byte **start, size_t * length) override |
192ca6d8 TT |
712 | { |
713 | /* FIXME: cagney/2003-03-26: This code should be using | |
714 | get_frame_base_address(), and then implement a dwarf2 specific | |
715 | this_base method. */ | |
716 | struct symbol *framefunc; | |
717 | const struct block *bl = get_frame_block (frame, NULL); | |
718 | ||
719 | if (bl == NULL) | |
720 | error (_("frame address is not available.")); | |
721 | ||
722 | /* Use block_linkage_function, which returns a real (not inlined) | |
723 | function, instead of get_frame_function, which may return an | |
724 | inlined function. */ | |
725 | framefunc = block_linkage_function (bl); | |
726 | ||
727 | /* If we found a frame-relative symbol then it was certainly within | |
728 | some function associated with a frame. If we can't find the frame, | |
729 | something has gone wrong. */ | |
730 | gdb_assert (framefunc != NULL); | |
731 | ||
732 | func_get_frame_base_dwarf_block (framefunc, | |
733 | get_frame_address_in_block (frame), | |
734 | start, length); | |
735 | } | |
736 | ||
737 | /* Read memory at ADDR (length LEN) into BUF. */ | |
738 | ||
632e107b | 739 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override |
192ca6d8 TT |
740 | { |
741 | read_memory (addr, buf, len); | |
742 | } | |
743 | ||
744 | /* Using the frame specified in BATON, return the value of register | |
745 | REGNUM, treated as a pointer. */ | |
632e107b | 746 | CORE_ADDR read_addr_from_reg (int dwarf_regnum) override |
192ca6d8 TT |
747 | { |
748 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
749 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); | |
750 | ||
751 | return address_from_register (regnum, frame); | |
752 | } | |
753 | ||
754 | /* Implement "get_reg_value" callback. */ | |
755 | ||
632e107b | 756 | struct value *get_reg_value (struct type *type, int dwarf_regnum) override |
192ca6d8 TT |
757 | { |
758 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
759 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); | |
760 | ||
761 | return value_from_register (type, regnum, frame); | |
762 | } | |
763 | }; | |
8a9b8146 | 764 | |
8e3b41a9 JK |
765 | /* See dwarf2loc.h. */ |
766 | ||
ccce17b0 | 767 | unsigned int entry_values_debug = 0; |
8e3b41a9 JK |
768 | |
769 | /* Helper to set entry_values_debug. */ | |
770 | ||
771 | static void | |
772 | show_entry_values_debug (struct ui_file *file, int from_tty, | |
773 | struct cmd_list_element *c, const char *value) | |
774 | { | |
775 | fprintf_filtered (file, | |
776 | _("Entry values and tail call frames debugging is %s.\n"), | |
777 | value); | |
778 | } | |
779 | ||
216f72a1 | 780 | /* Find DW_TAG_call_site's DW_AT_call_target address. |
8e3b41a9 JK |
781 | CALLER_FRAME (for registers) can be NULL if it is not known. This function |
782 | always returns valid address or it throws NO_ENTRY_VALUE_ERROR. */ | |
783 | ||
784 | static CORE_ADDR | |
785 | call_site_to_target_addr (struct gdbarch *call_site_gdbarch, | |
786 | struct call_site *call_site, | |
787 | struct frame_info *caller_frame) | |
788 | { | |
789 | switch (FIELD_LOC_KIND (call_site->target)) | |
790 | { | |
791 | case FIELD_LOC_KIND_DWARF_BLOCK: | |
792 | { | |
793 | struct dwarf2_locexpr_baton *dwarf_block; | |
794 | struct value *val; | |
795 | struct type *caller_core_addr_type; | |
796 | struct gdbarch *caller_arch; | |
797 | ||
798 | dwarf_block = FIELD_DWARF_BLOCK (call_site->target); | |
799 | if (dwarf_block == NULL) | |
800 | { | |
7cbd4a93 | 801 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
802 | |
803 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
804 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 805 | _("DW_AT_call_target is not specified at %s in %s"), |
8e3b41a9 | 806 | paddress (call_site_gdbarch, call_site->pc), |
7cbd4a93 | 807 | (msym.minsym == NULL ? "???" |
efd66ac6 | 808 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
809 | |
810 | } | |
811 | if (caller_frame == NULL) | |
812 | { | |
7cbd4a93 | 813 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
814 | |
815 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
816 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 817 | _("DW_AT_call_target DWARF block resolving " |
8e3b41a9 JK |
818 | "requires known frame which is currently not " |
819 | "available at %s in %s"), | |
820 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 | 821 | (msym.minsym == NULL ? "???" |
efd66ac6 | 822 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
823 | |
824 | } | |
825 | caller_arch = get_frame_arch (caller_frame); | |
826 | caller_core_addr_type = builtin_type (caller_arch)->builtin_func_ptr; | |
827 | val = dwarf2_evaluate_loc_desc (caller_core_addr_type, caller_frame, | |
828 | dwarf_block->data, dwarf_block->size, | |
829 | dwarf_block->per_cu); | |
216f72a1 | 830 | /* DW_AT_call_target is a DWARF expression, not a DWARF location. */ |
8e3b41a9 JK |
831 | if (VALUE_LVAL (val) == lval_memory) |
832 | return value_address (val); | |
833 | else | |
834 | return value_as_address (val); | |
835 | } | |
836 | ||
837 | case FIELD_LOC_KIND_PHYSNAME: | |
838 | { | |
839 | const char *physname; | |
3b7344d5 | 840 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
841 | |
842 | physname = FIELD_STATIC_PHYSNAME (call_site->target); | |
9112db09 JK |
843 | |
844 | /* Handle both the mangled and demangled PHYSNAME. */ | |
845 | msym = lookup_minimal_symbol (physname, NULL, NULL); | |
3b7344d5 | 846 | if (msym.minsym == NULL) |
8e3b41a9 | 847 | { |
3b7344d5 | 848 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); |
8e3b41a9 JK |
849 | throw_error (NO_ENTRY_VALUE_ERROR, |
850 | _("Cannot find function \"%s\" for a call site target " | |
851 | "at %s in %s"), | |
852 | physname, paddress (call_site_gdbarch, call_site->pc), | |
3b7344d5 TT |
853 | (msym.minsym == NULL ? "???" |
854 | : MSYMBOL_PRINT_NAME (msym.minsym))); | |
8e3b41a9 JK |
855 | |
856 | } | |
77e371c0 | 857 | return BMSYMBOL_VALUE_ADDRESS (msym); |
8e3b41a9 JK |
858 | } |
859 | ||
860 | case FIELD_LOC_KIND_PHYSADDR: | |
861 | return FIELD_STATIC_PHYSADDR (call_site->target); | |
862 | ||
863 | default: | |
864 | internal_error (__FILE__, __LINE__, _("invalid call site target kind")); | |
865 | } | |
866 | } | |
867 | ||
111c6489 JK |
868 | /* Convert function entry point exact address ADDR to the function which is |
869 | compliant with TAIL_CALL_LIST_COMPLETE condition. Throw | |
870 | NO_ENTRY_VALUE_ERROR otherwise. */ | |
871 | ||
872 | static struct symbol * | |
873 | func_addr_to_tail_call_list (struct gdbarch *gdbarch, CORE_ADDR addr) | |
874 | { | |
875 | struct symbol *sym = find_pc_function (addr); | |
876 | struct type *type; | |
877 | ||
2b1ffcfd | 878 | if (sym == NULL || BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (sym)) != addr) |
111c6489 | 879 | throw_error (NO_ENTRY_VALUE_ERROR, |
216f72a1 | 880 | _("DW_TAG_call_site resolving failed to find function " |
111c6489 JK |
881 | "name for address %s"), |
882 | paddress (gdbarch, addr)); | |
883 | ||
884 | type = SYMBOL_TYPE (sym); | |
885 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FUNC); | |
886 | gdb_assert (TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_FUNC); | |
887 | ||
888 | return sym; | |
889 | } | |
890 | ||
2d6c5dc2 JK |
891 | /* Verify function with entry point exact address ADDR can never call itself |
892 | via its tail calls (incl. transitively). Throw NO_ENTRY_VALUE_ERROR if it | |
893 | can call itself via tail calls. | |
894 | ||
895 | If a funtion can tail call itself its entry value based parameters are | |
896 | unreliable. There is no verification whether the value of some/all | |
897 | parameters is unchanged through the self tail call, we expect if there is | |
898 | a self tail call all the parameters can be modified. */ | |
899 | ||
900 | static void | |
901 | func_verify_no_selftailcall (struct gdbarch *gdbarch, CORE_ADDR verify_addr) | |
902 | { | |
2d6c5dc2 JK |
903 | CORE_ADDR addr; |
904 | ||
2d6c5dc2 JK |
905 | /* The verification is completely unordered. Track here function addresses |
906 | which still need to be iterated. */ | |
fc4007c9 | 907 | std::vector<CORE_ADDR> todo; |
2d6c5dc2 | 908 | |
fc4007c9 TT |
909 | /* Track here CORE_ADDRs which were already visited. */ |
910 | std::unordered_set<CORE_ADDR> addr_hash; | |
2d6c5dc2 | 911 | |
fc4007c9 TT |
912 | todo.push_back (verify_addr); |
913 | while (!todo.empty ()) | |
2d6c5dc2 JK |
914 | { |
915 | struct symbol *func_sym; | |
916 | struct call_site *call_site; | |
917 | ||
fc4007c9 TT |
918 | addr = todo.back (); |
919 | todo.pop_back (); | |
2d6c5dc2 JK |
920 | |
921 | func_sym = func_addr_to_tail_call_list (gdbarch, addr); | |
922 | ||
923 | for (call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (func_sym)); | |
924 | call_site; call_site = call_site->tail_call_next) | |
925 | { | |
926 | CORE_ADDR target_addr; | |
2d6c5dc2 JK |
927 | |
928 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
929 | frames. */ | |
930 | target_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
931 | ||
932 | if (target_addr == verify_addr) | |
933 | { | |
7cbd4a93 | 934 | struct bound_minimal_symbol msym; |
2d6c5dc2 JK |
935 | |
936 | msym = lookup_minimal_symbol_by_pc (verify_addr); | |
937 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 938 | _("DW_OP_entry_value resolving has found " |
2d6c5dc2 JK |
939 | "function \"%s\" at %s can call itself via tail " |
940 | "calls"), | |
7cbd4a93 | 941 | (msym.minsym == NULL ? "???" |
efd66ac6 | 942 | : MSYMBOL_PRINT_NAME (msym.minsym)), |
2d6c5dc2 JK |
943 | paddress (gdbarch, verify_addr)); |
944 | } | |
945 | ||
fc4007c9 TT |
946 | if (addr_hash.insert (target_addr).second) |
947 | todo.push_back (target_addr); | |
2d6c5dc2 JK |
948 | } |
949 | } | |
2d6c5dc2 JK |
950 | } |
951 | ||
111c6489 JK |
952 | /* Print user readable form of CALL_SITE->PC to gdb_stdlog. Used only for |
953 | ENTRY_VALUES_DEBUG. */ | |
954 | ||
955 | static void | |
956 | tailcall_dump (struct gdbarch *gdbarch, const struct call_site *call_site) | |
957 | { | |
958 | CORE_ADDR addr = call_site->pc; | |
7cbd4a93 | 959 | struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (addr - 1); |
111c6489 JK |
960 | |
961 | fprintf_unfiltered (gdb_stdlog, " %s(%s)", paddress (gdbarch, addr), | |
7cbd4a93 | 962 | (msym.minsym == NULL ? "???" |
efd66ac6 | 963 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
111c6489 JK |
964 | |
965 | } | |
966 | ||
111c6489 JK |
967 | /* Intersect RESULTP with CHAIN to keep RESULTP unambiguous, keep in RESULTP |
968 | only top callers and bottom callees which are present in both. GDBARCH is | |
969 | used only for ENTRY_VALUES_DEBUG. RESULTP is NULL after return if there are | |
970 | no remaining possibilities to provide unambiguous non-trivial result. | |
971 | RESULTP should point to NULL on the first (initialization) call. Caller is | |
972 | responsible for xfree of any RESULTP data. */ | |
973 | ||
974 | static void | |
fc4007c9 TT |
975 | chain_candidate (struct gdbarch *gdbarch, |
976 | gdb::unique_xmalloc_ptr<struct call_site_chain> *resultp, | |
977 | std::vector<struct call_site *> *chain) | |
111c6489 | 978 | { |
fc4007c9 | 979 | long length = chain->size (); |
111c6489 JK |
980 | int callers, callees, idx; |
981 | ||
fc4007c9 | 982 | if (*resultp == NULL) |
111c6489 JK |
983 | { |
984 | /* Create the initial chain containing all the passed PCs. */ | |
985 | ||
fc4007c9 TT |
986 | struct call_site_chain *result |
987 | = ((struct call_site_chain *) | |
988 | xmalloc (sizeof (*result) | |
989 | + sizeof (*result->call_site) * (length - 1))); | |
111c6489 JK |
990 | result->length = length; |
991 | result->callers = result->callees = length; | |
fc4007c9 TT |
992 | if (!chain->empty ()) |
993 | memcpy (result->call_site, chain->data (), | |
19a1b230 | 994 | sizeof (*result->call_site) * length); |
fc4007c9 | 995 | resultp->reset (result); |
111c6489 JK |
996 | |
997 | if (entry_values_debug) | |
998 | { | |
999 | fprintf_unfiltered (gdb_stdlog, "tailcall: initial:"); | |
1000 | for (idx = 0; idx < length; idx++) | |
1001 | tailcall_dump (gdbarch, result->call_site[idx]); | |
1002 | fputc_unfiltered ('\n', gdb_stdlog); | |
1003 | } | |
1004 | ||
1005 | return; | |
1006 | } | |
1007 | ||
1008 | if (entry_values_debug) | |
1009 | { | |
1010 | fprintf_unfiltered (gdb_stdlog, "tailcall: compare:"); | |
1011 | for (idx = 0; idx < length; idx++) | |
fc4007c9 | 1012 | tailcall_dump (gdbarch, chain->at (idx)); |
111c6489 JK |
1013 | fputc_unfiltered ('\n', gdb_stdlog); |
1014 | } | |
1015 | ||
1016 | /* Intersect callers. */ | |
1017 | ||
fc4007c9 | 1018 | callers = std::min ((long) (*resultp)->callers, length); |
111c6489 | 1019 | for (idx = 0; idx < callers; idx++) |
fc4007c9 | 1020 | if ((*resultp)->call_site[idx] != chain->at (idx)) |
111c6489 | 1021 | { |
fc4007c9 | 1022 | (*resultp)->callers = idx; |
111c6489 JK |
1023 | break; |
1024 | } | |
1025 | ||
1026 | /* Intersect callees. */ | |
1027 | ||
fc4007c9 | 1028 | callees = std::min ((long) (*resultp)->callees, length); |
111c6489 | 1029 | for (idx = 0; idx < callees; idx++) |
fc4007c9 TT |
1030 | if ((*resultp)->call_site[(*resultp)->length - 1 - idx] |
1031 | != chain->at (length - 1 - idx)) | |
111c6489 | 1032 | { |
fc4007c9 | 1033 | (*resultp)->callees = idx; |
111c6489 JK |
1034 | break; |
1035 | } | |
1036 | ||
1037 | if (entry_values_debug) | |
1038 | { | |
1039 | fprintf_unfiltered (gdb_stdlog, "tailcall: reduced:"); | |
fc4007c9 TT |
1040 | for (idx = 0; idx < (*resultp)->callers; idx++) |
1041 | tailcall_dump (gdbarch, (*resultp)->call_site[idx]); | |
111c6489 | 1042 | fputs_unfiltered (" |", gdb_stdlog); |
fc4007c9 TT |
1043 | for (idx = 0; idx < (*resultp)->callees; idx++) |
1044 | tailcall_dump (gdbarch, | |
1045 | (*resultp)->call_site[(*resultp)->length | |
1046 | - (*resultp)->callees + idx]); | |
111c6489 JK |
1047 | fputc_unfiltered ('\n', gdb_stdlog); |
1048 | } | |
1049 | ||
fc4007c9 | 1050 | if ((*resultp)->callers == 0 && (*resultp)->callees == 0) |
111c6489 JK |
1051 | { |
1052 | /* There are no common callers or callees. It could be also a direct | |
1053 | call (which has length 0) with ambiguous possibility of an indirect | |
1054 | call - CALLERS == CALLEES == 0 is valid during the first allocation | |
1055 | but any subsequence processing of such entry means ambiguity. */ | |
fc4007c9 | 1056 | resultp->reset (NULL); |
111c6489 JK |
1057 | return; |
1058 | } | |
1059 | ||
1060 | /* See call_site_find_chain_1 why there is no way to reach the bottom callee | |
1061 | PC again. In such case there must be two different code paths to reach | |
e0619de6 | 1062 | it. CALLERS + CALLEES equal to LENGTH in the case of self tail-call. */ |
fc4007c9 | 1063 | gdb_assert ((*resultp)->callers + (*resultp)->callees <= (*resultp)->length); |
111c6489 JK |
1064 | } |
1065 | ||
1066 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1067 | assumed frames between them use GDBARCH. Use depth first search so we can | |
1068 | keep single CHAIN of call_site's back to CALLER_PC. Function recursion | |
1069 | would have needless GDB stack overhead. Caller is responsible for xfree of | |
1070 | the returned result. Any unreliability results in thrown | |
1071 | NO_ENTRY_VALUE_ERROR. */ | |
1072 | ||
1073 | static struct call_site_chain * | |
1074 | call_site_find_chain_1 (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
1075 | CORE_ADDR callee_pc) | |
1076 | { | |
c4be5165 | 1077 | CORE_ADDR save_callee_pc = callee_pc; |
fc4007c9 | 1078 | gdb::unique_xmalloc_ptr<struct call_site_chain> retval; |
111c6489 JK |
1079 | struct call_site *call_site; |
1080 | ||
111c6489 JK |
1081 | /* CHAIN contains only the intermediate CALL_SITEs. Neither CALLER_PC's |
1082 | call_site nor any possible call_site at CALLEE_PC's function is there. | |
1083 | Any CALL_SITE in CHAIN will be iterated to its siblings - via | |
1084 | TAIL_CALL_NEXT. This is inappropriate for CALLER_PC's call_site. */ | |
fc4007c9 | 1085 | std::vector<struct call_site *> chain; |
111c6489 JK |
1086 | |
1087 | /* We are not interested in the specific PC inside the callee function. */ | |
1088 | callee_pc = get_pc_function_start (callee_pc); | |
1089 | if (callee_pc == 0) | |
1090 | throw_error (NO_ENTRY_VALUE_ERROR, _("Unable to find function for PC %s"), | |
c4be5165 | 1091 | paddress (gdbarch, save_callee_pc)); |
111c6489 | 1092 | |
fc4007c9 TT |
1093 | /* Mark CALL_SITEs so we do not visit the same ones twice. */ |
1094 | std::unordered_set<CORE_ADDR> addr_hash; | |
111c6489 JK |
1095 | |
1096 | /* Do not push CALL_SITE to CHAIN. Push there only the first tail call site | |
1097 | at the target's function. All the possible tail call sites in the | |
1098 | target's function will get iterated as already pushed into CHAIN via their | |
1099 | TAIL_CALL_NEXT. */ | |
1100 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1101 | ||
1102 | while (call_site) | |
1103 | { | |
1104 | CORE_ADDR target_func_addr; | |
1105 | struct call_site *target_call_site; | |
1106 | ||
1107 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
1108 | frames. */ | |
1109 | target_func_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
1110 | ||
1111 | if (target_func_addr == callee_pc) | |
1112 | { | |
fc4007c9 | 1113 | chain_candidate (gdbarch, &retval, &chain); |
111c6489 JK |
1114 | if (retval == NULL) |
1115 | break; | |
1116 | ||
1117 | /* There is no way to reach CALLEE_PC again as we would prevent | |
1118 | entering it twice as being already marked in ADDR_HASH. */ | |
1119 | target_call_site = NULL; | |
1120 | } | |
1121 | else | |
1122 | { | |
1123 | struct symbol *target_func; | |
1124 | ||
1125 | target_func = func_addr_to_tail_call_list (gdbarch, target_func_addr); | |
1126 | target_call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (target_func)); | |
1127 | } | |
1128 | ||
1129 | do | |
1130 | { | |
1131 | /* Attempt to visit TARGET_CALL_SITE. */ | |
1132 | ||
1133 | if (target_call_site) | |
1134 | { | |
fc4007c9 | 1135 | if (addr_hash.insert (target_call_site->pc).second) |
111c6489 JK |
1136 | { |
1137 | /* Successfully entered TARGET_CALL_SITE. */ | |
1138 | ||
fc4007c9 | 1139 | chain.push_back (target_call_site); |
111c6489 JK |
1140 | break; |
1141 | } | |
1142 | } | |
1143 | ||
1144 | /* Backtrack (without revisiting the originating call_site). Try the | |
1145 | callers's sibling; if there isn't any try the callers's callers's | |
1146 | sibling etc. */ | |
1147 | ||
1148 | target_call_site = NULL; | |
fc4007c9 | 1149 | while (!chain.empty ()) |
111c6489 | 1150 | { |
fc4007c9 TT |
1151 | call_site = chain.back (); |
1152 | chain.pop_back (); | |
111c6489 | 1153 | |
fc4007c9 TT |
1154 | size_t removed = addr_hash.erase (call_site->pc); |
1155 | gdb_assert (removed == 1); | |
111c6489 JK |
1156 | |
1157 | target_call_site = call_site->tail_call_next; | |
1158 | if (target_call_site) | |
1159 | break; | |
1160 | } | |
1161 | } | |
1162 | while (target_call_site); | |
1163 | ||
fc4007c9 | 1164 | if (chain.empty ()) |
111c6489 JK |
1165 | call_site = NULL; |
1166 | else | |
fc4007c9 | 1167 | call_site = chain.back (); |
111c6489 JK |
1168 | } |
1169 | ||
1170 | if (retval == NULL) | |
1171 | { | |
7cbd4a93 | 1172 | struct bound_minimal_symbol msym_caller, msym_callee; |
111c6489 JK |
1173 | |
1174 | msym_caller = lookup_minimal_symbol_by_pc (caller_pc); | |
1175 | msym_callee = lookup_minimal_symbol_by_pc (callee_pc); | |
1176 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1177 | _("There are no unambiguously determinable intermediate " | |
1178 | "callers or callees between caller function \"%s\" at %s " | |
1179 | "and callee function \"%s\" at %s"), | |
7cbd4a93 | 1180 | (msym_caller.minsym == NULL |
efd66ac6 | 1181 | ? "???" : MSYMBOL_PRINT_NAME (msym_caller.minsym)), |
111c6489 | 1182 | paddress (gdbarch, caller_pc), |
7cbd4a93 | 1183 | (msym_callee.minsym == NULL |
efd66ac6 | 1184 | ? "???" : MSYMBOL_PRINT_NAME (msym_callee.minsym)), |
111c6489 JK |
1185 | paddress (gdbarch, callee_pc)); |
1186 | } | |
1187 | ||
fc4007c9 | 1188 | return retval.release (); |
111c6489 JK |
1189 | } |
1190 | ||
1191 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1192 | assumed frames between them use GDBARCH. If valid call_site_chain cannot be | |
1193 | constructed return NULL. Caller is responsible for xfree of the returned | |
1194 | result. */ | |
1195 | ||
1196 | struct call_site_chain * | |
1197 | call_site_find_chain (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
1198 | CORE_ADDR callee_pc) | |
1199 | { | |
111c6489 JK |
1200 | struct call_site_chain *retval = NULL; |
1201 | ||
492d29ea | 1202 | TRY |
111c6489 JK |
1203 | { |
1204 | retval = call_site_find_chain_1 (gdbarch, caller_pc, callee_pc); | |
1205 | } | |
492d29ea | 1206 | CATCH (e, RETURN_MASK_ERROR) |
111c6489 JK |
1207 | { |
1208 | if (e.error == NO_ENTRY_VALUE_ERROR) | |
1209 | { | |
1210 | if (entry_values_debug) | |
1211 | exception_print (gdb_stdout, e); | |
1212 | ||
1213 | return NULL; | |
1214 | } | |
1215 | else | |
1216 | throw_exception (e); | |
1217 | } | |
492d29ea PA |
1218 | END_CATCH |
1219 | ||
111c6489 JK |
1220 | return retval; |
1221 | } | |
1222 | ||
24c5c679 JK |
1223 | /* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */ |
1224 | ||
1225 | static int | |
1226 | call_site_parameter_matches (struct call_site_parameter *parameter, | |
1227 | enum call_site_parameter_kind kind, | |
1228 | union call_site_parameter_u kind_u) | |
1229 | { | |
1230 | if (kind == parameter->kind) | |
1231 | switch (kind) | |
1232 | { | |
1233 | case CALL_SITE_PARAMETER_DWARF_REG: | |
1234 | return kind_u.dwarf_reg == parameter->u.dwarf_reg; | |
1235 | case CALL_SITE_PARAMETER_FB_OFFSET: | |
1236 | return kind_u.fb_offset == parameter->u.fb_offset; | |
1788b2d3 | 1237 | case CALL_SITE_PARAMETER_PARAM_OFFSET: |
9c541725 | 1238 | return kind_u.param_cu_off == parameter->u.param_cu_off; |
24c5c679 JK |
1239 | } |
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | /* Fetch call_site_parameter from caller matching KIND and KIND_U. | |
1244 | FRAME is for callee. | |
8e3b41a9 JK |
1245 | |
1246 | Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR | |
1247 | otherwise. */ | |
1248 | ||
1249 | static struct call_site_parameter * | |
24c5c679 JK |
1250 | dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, |
1251 | enum call_site_parameter_kind kind, | |
1252 | union call_site_parameter_u kind_u, | |
8e3b41a9 JK |
1253 | struct dwarf2_per_cu_data **per_cu_return) |
1254 | { | |
9e3a7d65 JK |
1255 | CORE_ADDR func_addr, caller_pc; |
1256 | struct gdbarch *gdbarch; | |
1257 | struct frame_info *caller_frame; | |
8e3b41a9 JK |
1258 | struct call_site *call_site; |
1259 | int iparams; | |
509f0fd9 JK |
1260 | /* Initialize it just to avoid a GCC false warning. */ |
1261 | struct call_site_parameter *parameter = NULL; | |
8e3b41a9 JK |
1262 | CORE_ADDR target_addr; |
1263 | ||
9e3a7d65 JK |
1264 | while (get_frame_type (frame) == INLINE_FRAME) |
1265 | { | |
1266 | frame = get_prev_frame (frame); | |
1267 | gdb_assert (frame != NULL); | |
1268 | } | |
1269 | ||
1270 | func_addr = get_frame_func (frame); | |
1271 | gdbarch = get_frame_arch (frame); | |
1272 | caller_frame = get_prev_frame (frame); | |
8e3b41a9 JK |
1273 | if (gdbarch != frame_unwind_arch (frame)) |
1274 | { | |
7cbd4a93 TT |
1275 | struct bound_minimal_symbol msym |
1276 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1277 | struct gdbarch *caller_gdbarch = frame_unwind_arch (frame); |
1278 | ||
1279 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1280 | _("DW_OP_entry_value resolving callee gdbarch %s " |
8e3b41a9 JK |
1281 | "(of %s (%s)) does not match caller gdbarch %s"), |
1282 | gdbarch_bfd_arch_info (gdbarch)->printable_name, | |
1283 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1284 | (msym.minsym == NULL ? "???" |
efd66ac6 | 1285 | : MSYMBOL_PRINT_NAME (msym.minsym)), |
8e3b41a9 JK |
1286 | gdbarch_bfd_arch_info (caller_gdbarch)->printable_name); |
1287 | } | |
1288 | ||
1289 | if (caller_frame == NULL) | |
1290 | { | |
7cbd4a93 TT |
1291 | struct bound_minimal_symbol msym |
1292 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 | 1293 | |
216f72a1 | 1294 | throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_entry_value resolving " |
8e3b41a9 JK |
1295 | "requires caller of %s (%s)"), |
1296 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1297 | (msym.minsym == NULL ? "???" |
efd66ac6 | 1298 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
1299 | } |
1300 | caller_pc = get_frame_pc (caller_frame); | |
1301 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1302 | ||
1303 | target_addr = call_site_to_target_addr (gdbarch, call_site, caller_frame); | |
1304 | if (target_addr != func_addr) | |
1305 | { | |
1306 | struct minimal_symbol *target_msym, *func_msym; | |
1307 | ||
7cbd4a93 TT |
1308 | target_msym = lookup_minimal_symbol_by_pc (target_addr).minsym; |
1309 | func_msym = lookup_minimal_symbol_by_pc (func_addr).minsym; | |
8e3b41a9 | 1310 | throw_error (NO_ENTRY_VALUE_ERROR, |
216f72a1 | 1311 | _("DW_OP_entry_value resolving expects callee %s at %s " |
8e3b41a9 JK |
1312 | "but the called frame is for %s at %s"), |
1313 | (target_msym == NULL ? "???" | |
efd66ac6 | 1314 | : MSYMBOL_PRINT_NAME (target_msym)), |
8e3b41a9 | 1315 | paddress (gdbarch, target_addr), |
efd66ac6 | 1316 | func_msym == NULL ? "???" : MSYMBOL_PRINT_NAME (func_msym), |
8e3b41a9 JK |
1317 | paddress (gdbarch, func_addr)); |
1318 | } | |
1319 | ||
2d6c5dc2 JK |
1320 | /* No entry value based parameters would be reliable if this function can |
1321 | call itself via tail calls. */ | |
1322 | func_verify_no_selftailcall (gdbarch, func_addr); | |
1323 | ||
8e3b41a9 JK |
1324 | for (iparams = 0; iparams < call_site->parameter_count; iparams++) |
1325 | { | |
1326 | parameter = &call_site->parameter[iparams]; | |
24c5c679 | 1327 | if (call_site_parameter_matches (parameter, kind, kind_u)) |
8e3b41a9 JK |
1328 | break; |
1329 | } | |
1330 | if (iparams == call_site->parameter_count) | |
1331 | { | |
7cbd4a93 TT |
1332 | struct minimal_symbol *msym |
1333 | = lookup_minimal_symbol_by_pc (caller_pc).minsym; | |
8e3b41a9 | 1334 | |
216f72a1 | 1335 | /* DW_TAG_call_site_parameter will be missing just if GCC could not |
8e3b41a9 JK |
1336 | determine its value. */ |
1337 | throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot find matching parameter " | |
216f72a1 | 1338 | "at DW_TAG_call_site %s at %s"), |
8e3b41a9 | 1339 | paddress (gdbarch, caller_pc), |
efd66ac6 | 1340 | msym == NULL ? "???" : MSYMBOL_PRINT_NAME (msym)); |
8e3b41a9 JK |
1341 | } |
1342 | ||
1343 | *per_cu_return = call_site->per_cu; | |
1344 | return parameter; | |
1345 | } | |
1346 | ||
a471c594 | 1347 | /* Return value for PARAMETER matching DEREF_SIZE. If DEREF_SIZE is -1, return |
216f72a1 JK |
1348 | the normal DW_AT_call_value block. Otherwise return the |
1349 | DW_AT_call_data_value (dereferenced) block. | |
e18b2753 JK |
1350 | |
1351 | TYPE and CALLER_FRAME specify how to evaluate the DWARF block into returned | |
1352 | struct value. | |
1353 | ||
1354 | Function always returns non-NULL, non-optimized out value. It throws | |
1355 | NO_ENTRY_VALUE_ERROR if it cannot resolve the value for any reason. */ | |
1356 | ||
1357 | static struct value * | |
1358 | dwarf_entry_parameter_to_value (struct call_site_parameter *parameter, | |
a471c594 | 1359 | CORE_ADDR deref_size, struct type *type, |
e18b2753 JK |
1360 | struct frame_info *caller_frame, |
1361 | struct dwarf2_per_cu_data *per_cu) | |
1362 | { | |
a471c594 | 1363 | const gdb_byte *data_src; |
e18b2753 | 1364 | gdb_byte *data; |
a471c594 JK |
1365 | size_t size; |
1366 | ||
1367 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
1368 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1369 | ||
1370 | /* DEREF_SIZE size is not verified here. */ | |
1371 | if (data_src == NULL) | |
1372 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1373 | _("Cannot resolve DW_AT_call_data_value")); |
e18b2753 | 1374 | |
216f72a1 | 1375 | /* DW_AT_call_value is a DWARF expression, not a DWARF |
e18b2753 JK |
1376 | location. Postprocessing of DWARF_VALUE_MEMORY would lose the type from |
1377 | DWARF block. */ | |
224c3ddb | 1378 | data = (gdb_byte *) alloca (size + 1); |
a471c594 JK |
1379 | memcpy (data, data_src, size); |
1380 | data[size] = DW_OP_stack_value; | |
e18b2753 | 1381 | |
a471c594 | 1382 | return dwarf2_evaluate_loc_desc (type, caller_frame, data, size + 1, per_cu); |
e18b2753 JK |
1383 | } |
1384 | ||
a471c594 JK |
1385 | /* VALUE must be of type lval_computed with entry_data_value_funcs. Perform |
1386 | the indirect method on it, that is use its stored target value, the sole | |
1387 | purpose of entry_data_value_funcs.. */ | |
1388 | ||
1389 | static struct value * | |
1390 | entry_data_value_coerce_ref (const struct value *value) | |
1391 | { | |
1392 | struct type *checked_type = check_typedef (value_type (value)); | |
1393 | struct value *target_val; | |
1394 | ||
aa006118 | 1395 | if (!TYPE_IS_REFERENCE (checked_type)) |
a471c594 JK |
1396 | return NULL; |
1397 | ||
9a3c8263 | 1398 | target_val = (struct value *) value_computed_closure (value); |
a471c594 JK |
1399 | value_incref (target_val); |
1400 | return target_val; | |
1401 | } | |
1402 | ||
1403 | /* Implement copy_closure. */ | |
1404 | ||
1405 | static void * | |
1406 | entry_data_value_copy_closure (const struct value *v) | |
1407 | { | |
9a3c8263 | 1408 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1409 | |
1410 | value_incref (target_val); | |
1411 | return target_val; | |
1412 | } | |
1413 | ||
1414 | /* Implement free_closure. */ | |
1415 | ||
1416 | static void | |
1417 | entry_data_value_free_closure (struct value *v) | |
1418 | { | |
9a3c8263 | 1419 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 | 1420 | |
22bc8444 | 1421 | value_decref (target_val); |
a471c594 JK |
1422 | } |
1423 | ||
1424 | /* Vector for methods for an entry value reference where the referenced value | |
1425 | is stored in the caller. On the first dereference use | |
216f72a1 | 1426 | DW_AT_call_data_value in the caller. */ |
a471c594 JK |
1427 | |
1428 | static const struct lval_funcs entry_data_value_funcs = | |
1429 | { | |
1430 | NULL, /* read */ | |
1431 | NULL, /* write */ | |
a471c594 JK |
1432 | NULL, /* indirect */ |
1433 | entry_data_value_coerce_ref, | |
1434 | NULL, /* check_synthetic_pointer */ | |
1435 | entry_data_value_copy_closure, | |
1436 | entry_data_value_free_closure | |
1437 | }; | |
1438 | ||
24c5c679 JK |
1439 | /* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U |
1440 | are used to match DW_AT_location at the caller's | |
216f72a1 | 1441 | DW_TAG_call_site_parameter. |
e18b2753 JK |
1442 | |
1443 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1444 | cannot resolve the parameter for any reason. */ | |
1445 | ||
1446 | static struct value * | |
1447 | value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame, | |
24c5c679 JK |
1448 | enum call_site_parameter_kind kind, |
1449 | union call_site_parameter_u kind_u) | |
e18b2753 | 1450 | { |
a471c594 JK |
1451 | struct type *checked_type = check_typedef (type); |
1452 | struct type *target_type = TYPE_TARGET_TYPE (checked_type); | |
e18b2753 | 1453 | struct frame_info *caller_frame = get_prev_frame (frame); |
a471c594 | 1454 | struct value *outer_val, *target_val, *val; |
e18b2753 JK |
1455 | struct call_site_parameter *parameter; |
1456 | struct dwarf2_per_cu_data *caller_per_cu; | |
1457 | ||
24c5c679 | 1458 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
e18b2753 JK |
1459 | &caller_per_cu); |
1460 | ||
a471c594 JK |
1461 | outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */, |
1462 | type, caller_frame, | |
1463 | caller_per_cu); | |
1464 | ||
216f72a1 | 1465 | /* Check if DW_AT_call_data_value cannot be used. If it should be |
a471c594 JK |
1466 | used and it is not available do not fall back to OUTER_VAL - dereferencing |
1467 | TYPE_CODE_REF with non-entry data value would give current value - not the | |
1468 | entry value. */ | |
1469 | ||
aa006118 | 1470 | if (!TYPE_IS_REFERENCE (checked_type) |
a471c594 JK |
1471 | || TYPE_TARGET_TYPE (checked_type) == NULL) |
1472 | return outer_val; | |
1473 | ||
1474 | target_val = dwarf_entry_parameter_to_value (parameter, | |
1475 | TYPE_LENGTH (target_type), | |
1476 | target_type, caller_frame, | |
1477 | caller_per_cu); | |
1478 | ||
a471c594 | 1479 | val = allocate_computed_value (type, &entry_data_value_funcs, |
895dafa6 | 1480 | release_value (target_val).release ()); |
a471c594 JK |
1481 | |
1482 | /* Copy the referencing pointer to the new computed value. */ | |
1483 | memcpy (value_contents_raw (val), value_contents_raw (outer_val), | |
1484 | TYPE_LENGTH (checked_type)); | |
1485 | set_value_lazy (val, 0); | |
1486 | ||
1487 | return val; | |
e18b2753 JK |
1488 | } |
1489 | ||
1490 | /* Read parameter of TYPE at (callee) FRAME's function entry. DATA and | |
1491 | SIZE are DWARF block used to match DW_AT_location at the caller's | |
216f72a1 | 1492 | DW_TAG_call_site_parameter. |
e18b2753 JK |
1493 | |
1494 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1495 | cannot resolve the parameter for any reason. */ | |
1496 | ||
1497 | static struct value * | |
1498 | value_of_dwarf_block_entry (struct type *type, struct frame_info *frame, | |
1499 | const gdb_byte *block, size_t block_len) | |
1500 | { | |
24c5c679 | 1501 | union call_site_parameter_u kind_u; |
e18b2753 | 1502 | |
24c5c679 JK |
1503 | kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len); |
1504 | if (kind_u.dwarf_reg != -1) | |
1505 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG, | |
1506 | kind_u); | |
e18b2753 | 1507 | |
24c5c679 JK |
1508 | if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset)) |
1509 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET, | |
1510 | kind_u); | |
e18b2753 JK |
1511 | |
1512 | /* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message | |
1513 | suppressed during normal operation. The expression can be arbitrary if | |
1514 | there is no caller-callee entry value binding expected. */ | |
1515 | throw_error (NO_ENTRY_VALUE_ERROR, | |
216f72a1 | 1516 | _("DWARF-2 expression error: DW_OP_entry_value is supported " |
e18b2753 JK |
1517 | "only for single DW_OP_reg* or for DW_OP_fbreg(*)")); |
1518 | } | |
1519 | ||
052b9502 NF |
1520 | struct piece_closure |
1521 | { | |
88bfdde4 | 1522 | /* Reference count. */ |
1e467161 | 1523 | int refc = 0; |
88bfdde4 | 1524 | |
8cf6f0b1 | 1525 | /* The CU from which this closure's expression came. */ |
1e467161 | 1526 | struct dwarf2_per_cu_data *per_cu = NULL; |
052b9502 | 1527 | |
1e467161 SM |
1528 | /* The pieces describing this variable. */ |
1529 | std::vector<dwarf_expr_piece> pieces; | |
ee40d8d4 YQ |
1530 | |
1531 | /* Frame ID of frame to which a register value is relative, used | |
1532 | only by DWARF_VALUE_REGISTER. */ | |
1533 | struct frame_id frame_id; | |
052b9502 NF |
1534 | }; |
1535 | ||
1536 | /* Allocate a closure for a value formed from separately-described | |
1537 | PIECES. */ | |
1538 | ||
1539 | static struct piece_closure * | |
8cf6f0b1 | 1540 | allocate_piece_closure (struct dwarf2_per_cu_data *per_cu, |
1e467161 | 1541 | std::vector<dwarf_expr_piece> &&pieces, |
ddd7882a | 1542 | struct frame_info *frame) |
052b9502 | 1543 | { |
1e467161 | 1544 | struct piece_closure *c = new piece_closure; |
052b9502 | 1545 | |
88bfdde4 | 1546 | c->refc = 1; |
8cf6f0b1 | 1547 | c->per_cu = per_cu; |
1e467161 | 1548 | c->pieces = std::move (pieces); |
ee40d8d4 YQ |
1549 | if (frame == NULL) |
1550 | c->frame_id = null_frame_id; | |
1551 | else | |
1552 | c->frame_id = get_frame_id (frame); | |
052b9502 | 1553 | |
1e467161 SM |
1554 | for (dwarf_expr_piece &piece : c->pieces) |
1555 | if (piece.location == DWARF_VALUE_STACK) | |
1556 | value_incref (piece.v.value); | |
052b9502 NF |
1557 | |
1558 | return c; | |
1559 | } | |
1560 | ||
03c8af18 AA |
1561 | /* Return the number of bytes overlapping a contiguous chunk of N_BITS |
1562 | bits whose first bit is located at bit offset START. */ | |
1563 | ||
1564 | static size_t | |
1565 | bits_to_bytes (ULONGEST start, ULONGEST n_bits) | |
1566 | { | |
1567 | return (start % 8 + n_bits + 7) / 8; | |
1568 | } | |
1569 | ||
55acdf22 AA |
1570 | /* Read or write a pieced value V. If FROM != NULL, operate in "write |
1571 | mode": copy FROM into the pieces comprising V. If FROM == NULL, | |
1572 | operate in "read mode": fetch the contents of the (lazy) value V by | |
1573 | composing it from its pieces. */ | |
1574 | ||
052b9502 | 1575 | static void |
55acdf22 | 1576 | rw_pieced_value (struct value *v, struct value *from) |
052b9502 NF |
1577 | { |
1578 | int i; | |
359b19bb | 1579 | LONGEST offset = 0, max_offset; |
d3b1e874 | 1580 | ULONGEST bits_to_skip; |
55acdf22 AA |
1581 | gdb_byte *v_contents; |
1582 | const gdb_byte *from_contents; | |
3e43a32a MS |
1583 | struct piece_closure *c |
1584 | = (struct piece_closure *) value_computed_closure (v); | |
d5722aa2 | 1585 | gdb::byte_vector buffer; |
d3b1e874 TT |
1586 | int bits_big_endian |
1587 | = gdbarch_bits_big_endian (get_type_arch (value_type (v))); | |
afd74c5f | 1588 | |
55acdf22 AA |
1589 | if (from != NULL) |
1590 | { | |
1591 | from_contents = value_contents (from); | |
1592 | v_contents = NULL; | |
1593 | } | |
1594 | else | |
1595 | { | |
1596 | if (value_type (v) != value_enclosing_type (v)) | |
1597 | internal_error (__FILE__, __LINE__, | |
1598 | _("Should not be able to create a lazy value with " | |
1599 | "an enclosing type")); | |
1600 | v_contents = value_contents_raw (v); | |
1601 | from_contents = NULL; | |
1602 | } | |
052b9502 | 1603 | |
d3b1e874 | 1604 | bits_to_skip = 8 * value_offset (v); |
0e03807e TT |
1605 | if (value_bitsize (v)) |
1606 | { | |
af547a96 AA |
1607 | bits_to_skip += (8 * value_offset (value_parent (v)) |
1608 | + value_bitpos (v)); | |
55acdf22 AA |
1609 | if (from != NULL |
1610 | && (gdbarch_byte_order (get_type_arch (value_type (from))) | |
1611 | == BFD_ENDIAN_BIG)) | |
1612 | { | |
1613 | /* Use the least significant bits of FROM. */ | |
1614 | max_offset = 8 * TYPE_LENGTH (value_type (from)); | |
1615 | offset = max_offset - value_bitsize (v); | |
1616 | } | |
1617 | else | |
1618 | max_offset = value_bitsize (v); | |
0e03807e TT |
1619 | } |
1620 | else | |
359b19bb | 1621 | max_offset = 8 * TYPE_LENGTH (value_type (v)); |
d3b1e874 | 1622 | |
f236533e | 1623 | /* Advance to the first non-skipped piece. */ |
1e467161 | 1624 | for (i = 0; i < c->pieces.size () && bits_to_skip >= c->pieces[i].size; i++) |
f236533e AA |
1625 | bits_to_skip -= c->pieces[i].size; |
1626 | ||
1e467161 | 1627 | for (; i < c->pieces.size () && offset < max_offset; i++) |
052b9502 NF |
1628 | { |
1629 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
55acdf22 | 1630 | size_t this_size_bits, this_size; |
359b19bb | 1631 | |
f236533e | 1632 | this_size_bits = p->size - bits_to_skip; |
359b19bb AA |
1633 | if (this_size_bits > max_offset - offset) |
1634 | this_size_bits = max_offset - offset; | |
9a619af0 | 1635 | |
cec03d70 | 1636 | switch (p->location) |
052b9502 | 1637 | { |
cec03d70 TT |
1638 | case DWARF_VALUE_REGISTER: |
1639 | { | |
ee40d8d4 | 1640 | struct frame_info *frame = frame_find_by_id (c->frame_id); |
cec03d70 | 1641 | struct gdbarch *arch = get_frame_arch (frame); |
0fde2c53 | 1642 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno); |
03c8af18 | 1643 | ULONGEST reg_bits = 8 * register_size (arch, gdb_regnum); |
0fde2c53 | 1644 | int optim, unavail; |
dcbf108f | 1645 | |
0fde2c53 | 1646 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG |
65d84b76 | 1647 | && p->offset + p->size < reg_bits) |
63b4f126 | 1648 | { |
0fde2c53 | 1649 | /* Big-endian, and we want less than full size. */ |
f236533e | 1650 | bits_to_skip += reg_bits - (p->offset + p->size); |
63b4f126 | 1651 | } |
65d84b76 | 1652 | else |
f236533e | 1653 | bits_to_skip += p->offset; |
65d84b76 | 1654 | |
f236533e | 1655 | this_size = bits_to_bytes (bits_to_skip, this_size_bits); |
d5722aa2 | 1656 | buffer.resize (this_size); |
0fde2c53 | 1657 | |
55acdf22 | 1658 | if (from == NULL) |
63b4f126 | 1659 | { |
55acdf22 AA |
1660 | /* Read mode. */ |
1661 | if (!get_frame_register_bytes (frame, gdb_regnum, | |
1662 | bits_to_skip / 8, | |
1663 | this_size, buffer.data (), | |
1664 | &optim, &unavail)) | |
1665 | { | |
1666 | if (optim) | |
1667 | mark_value_bits_optimized_out (v, offset, | |
1668 | this_size_bits); | |
1669 | if (unavail) | |
1670 | mark_value_bits_unavailable (v, offset, | |
1671 | this_size_bits); | |
1672 | break; | |
1673 | } | |
1674 | ||
1675 | copy_bitwise (v_contents, offset, | |
1676 | buffer.data (), bits_to_skip % 8, | |
1677 | this_size_bits, bits_big_endian); | |
1678 | } | |
1679 | else | |
1680 | { | |
1681 | /* Write mode. */ | |
1682 | if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0) | |
1683 | { | |
1684 | /* Data is copied non-byte-aligned into the register. | |
1685 | Need some bits from original register value. */ | |
1686 | get_frame_register_bytes (frame, gdb_regnum, | |
1687 | bits_to_skip / 8, | |
1688 | this_size, buffer.data (), | |
1689 | &optim, &unavail); | |
1690 | if (optim) | |
1691 | throw_error (OPTIMIZED_OUT_ERROR, | |
1692 | _("Can't do read-modify-write to " | |
1693 | "update bitfield; containing word " | |
1694 | "has been optimized out")); | |
1695 | if (unavail) | |
1696 | throw_error (NOT_AVAILABLE_ERROR, | |
1697 | _("Can't do read-modify-write to " | |
1698 | "update bitfield; containing word " | |
1699 | "is unavailable")); | |
1700 | } | |
1701 | ||
1702 | copy_bitwise (buffer.data (), bits_to_skip % 8, | |
1703 | from_contents, offset, | |
1704 | this_size_bits, bits_big_endian); | |
1705 | put_frame_register_bytes (frame, gdb_regnum, | |
1706 | bits_to_skip / 8, | |
1707 | this_size, buffer.data ()); | |
63b4f126 | 1708 | } |
cec03d70 TT |
1709 | } |
1710 | break; | |
1711 | ||
1712 | case DWARF_VALUE_MEMORY: | |
55acdf22 AA |
1713 | { |
1714 | bits_to_skip += p->offset; | |
1715 | ||
1716 | CORE_ADDR start_addr = p->v.mem.addr + bits_to_skip / 8; | |
1717 | ||
1718 | if (bits_to_skip % 8 == 0 && this_size_bits % 8 == 0 | |
1719 | && offset % 8 == 0) | |
1720 | { | |
1721 | /* Everything is byte-aligned; no buffer needed. */ | |
1722 | if (from != NULL) | |
1723 | write_memory_with_notification (start_addr, | |
1724 | (from_contents | |
1725 | + offset / 8), | |
1726 | this_size_bits / 8); | |
1727 | else | |
1728 | read_value_memory (v, offset, | |
1729 | p->v.mem.in_stack_memory, | |
1730 | p->v.mem.addr + bits_to_skip / 8, | |
1731 | v_contents + offset / 8, | |
1732 | this_size_bits / 8); | |
1733 | break; | |
1734 | } | |
1735 | ||
1736 | this_size = bits_to_bytes (bits_to_skip, this_size_bits); | |
d5722aa2 | 1737 | buffer.resize (this_size); |
55acdf22 AA |
1738 | |
1739 | if (from == NULL) | |
1740 | { | |
1741 | /* Read mode. */ | |
1742 | read_value_memory (v, offset, | |
1743 | p->v.mem.in_stack_memory, | |
1744 | p->v.mem.addr + bits_to_skip / 8, | |
1745 | buffer.data (), this_size); | |
1746 | copy_bitwise (v_contents, offset, | |
1747 | buffer.data (), bits_to_skip % 8, | |
1748 | this_size_bits, bits_big_endian); | |
1749 | } | |
1750 | else | |
1751 | { | |
1752 | /* Write mode. */ | |
1753 | if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0) | |
1754 | { | |
1755 | if (this_size <= 8) | |
1756 | { | |
1757 | /* Perform a single read for small sizes. */ | |
1758 | read_memory (start_addr, buffer.data (), | |
1759 | this_size); | |
1760 | } | |
1761 | else | |
1762 | { | |
1763 | /* Only the first and last bytes can possibly have | |
1764 | any bits reused. */ | |
1765 | read_memory (start_addr, buffer.data (), 1); | |
1766 | read_memory (start_addr + this_size - 1, | |
1767 | &buffer[this_size - 1], 1); | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | copy_bitwise (buffer.data (), bits_to_skip % 8, | |
1772 | from_contents, offset, | |
1773 | this_size_bits, bits_big_endian); | |
1774 | write_memory_with_notification (start_addr, | |
1775 | buffer.data (), | |
1776 | this_size); | |
1777 | } | |
1778 | } | |
cec03d70 TT |
1779 | break; |
1780 | ||
1781 | case DWARF_VALUE_STACK: | |
1782 | { | |
55acdf22 AA |
1783 | if (from != NULL) |
1784 | { | |
1785 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1786 | break; | |
1787 | } | |
1788 | ||
e9352324 AA |
1789 | struct objfile *objfile = dwarf2_per_cu_objfile (c->per_cu); |
1790 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
1791 | ULONGEST stack_value_size_bits | |
1792 | = 8 * TYPE_LENGTH (value_type (p->v.value)); | |
1793 | ||
1794 | /* Use zeroes if piece reaches beyond stack value. */ | |
65d84b76 | 1795 | if (p->offset + p->size > stack_value_size_bits) |
e9352324 AA |
1796 | break; |
1797 | ||
1798 | /* Piece is anchored at least significant bit end. */ | |
1799 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
f236533e | 1800 | bits_to_skip += stack_value_size_bits - p->offset - p->size; |
65d84b76 | 1801 | else |
f236533e | 1802 | bits_to_skip += p->offset; |
e9352324 | 1803 | |
55acdf22 | 1804 | copy_bitwise (v_contents, offset, |
e9352324 | 1805 | value_contents_all (p->v.value), |
f236533e | 1806 | bits_to_skip, |
e9352324 | 1807 | this_size_bits, bits_big_endian); |
cec03d70 TT |
1808 | } |
1809 | break; | |
1810 | ||
1811 | case DWARF_VALUE_LITERAL: | |
1812 | { | |
55acdf22 AA |
1813 | if (from != NULL) |
1814 | { | |
1815 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1816 | break; | |
1817 | } | |
1818 | ||
242d31ab AA |
1819 | ULONGEST literal_size_bits = 8 * p->v.literal.length; |
1820 | size_t n = this_size_bits; | |
afd74c5f | 1821 | |
242d31ab | 1822 | /* Cut off at the end of the implicit value. */ |
f236533e AA |
1823 | bits_to_skip += p->offset; |
1824 | if (bits_to_skip >= literal_size_bits) | |
242d31ab | 1825 | break; |
f236533e AA |
1826 | if (n > literal_size_bits - bits_to_skip) |
1827 | n = literal_size_bits - bits_to_skip; | |
e9352324 | 1828 | |
55acdf22 | 1829 | copy_bitwise (v_contents, offset, |
f236533e | 1830 | p->v.literal.data, bits_to_skip, |
242d31ab | 1831 | n, bits_big_endian); |
cec03d70 TT |
1832 | } |
1833 | break; | |
1834 | ||
8cf6f0b1 | 1835 | case DWARF_VALUE_IMPLICIT_POINTER: |
55acdf22 AA |
1836 | if (from != NULL) |
1837 | { | |
1838 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1839 | break; | |
1840 | } | |
1841 | ||
1842 | /* These bits show up as zeros -- but do not cause the value to | |
1843 | be considered optimized-out. */ | |
8cf6f0b1 TT |
1844 | break; |
1845 | ||
cb826367 | 1846 | case DWARF_VALUE_OPTIMIZED_OUT: |
9a0dc9e3 | 1847 | mark_value_bits_optimized_out (v, offset, this_size_bits); |
cb826367 TT |
1848 | break; |
1849 | ||
cec03d70 TT |
1850 | default: |
1851 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
052b9502 | 1852 | } |
d3b1e874 | 1853 | |
d3b1e874 | 1854 | offset += this_size_bits; |
f236533e | 1855 | bits_to_skip = 0; |
052b9502 NF |
1856 | } |
1857 | } | |
1858 | ||
55acdf22 | 1859 | |
052b9502 | 1860 | static void |
55acdf22 | 1861 | read_pieced_value (struct value *v) |
052b9502 | 1862 | { |
55acdf22 AA |
1863 | rw_pieced_value (v, NULL); |
1864 | } | |
242d31ab | 1865 | |
55acdf22 AA |
1866 | static void |
1867 | write_pieced_value (struct value *to, struct value *from) | |
1868 | { | |
1869 | rw_pieced_value (to, from); | |
052b9502 NF |
1870 | } |
1871 | ||
9a0dc9e3 PA |
1872 | /* An implementation of an lval_funcs method to see whether a value is |
1873 | a synthetic pointer. */ | |
8cf6f0b1 | 1874 | |
0e03807e | 1875 | static int |
6b850546 | 1876 | check_pieced_synthetic_pointer (const struct value *value, LONGEST bit_offset, |
9a0dc9e3 | 1877 | int bit_length) |
0e03807e TT |
1878 | { |
1879 | struct piece_closure *c | |
1880 | = (struct piece_closure *) value_computed_closure (value); | |
1881 | int i; | |
1882 | ||
1883 | bit_offset += 8 * value_offset (value); | |
1884 | if (value_bitsize (value)) | |
1885 | bit_offset += value_bitpos (value); | |
1886 | ||
1e467161 | 1887 | for (i = 0; i < c->pieces.size () && bit_length > 0; i++) |
0e03807e TT |
1888 | { |
1889 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
1890 | size_t this_size_bits = p->size; | |
1891 | ||
1892 | if (bit_offset > 0) | |
1893 | { | |
1894 | if (bit_offset >= this_size_bits) | |
1895 | { | |
1896 | bit_offset -= this_size_bits; | |
1897 | continue; | |
1898 | } | |
1899 | ||
1900 | bit_length -= this_size_bits - bit_offset; | |
1901 | bit_offset = 0; | |
1902 | } | |
1903 | else | |
1904 | bit_length -= this_size_bits; | |
1905 | ||
9a0dc9e3 PA |
1906 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) |
1907 | return 0; | |
0e03807e TT |
1908 | } |
1909 | ||
9a0dc9e3 | 1910 | return 1; |
8cf6f0b1 TT |
1911 | } |
1912 | ||
1913 | /* A wrapper function for get_frame_address_in_block. */ | |
1914 | ||
1915 | static CORE_ADDR | |
1916 | get_frame_address_in_block_wrapper (void *baton) | |
1917 | { | |
9a3c8263 | 1918 | return get_frame_address_in_block ((struct frame_info *) baton); |
8cf6f0b1 TT |
1919 | } |
1920 | ||
3326303b MG |
1921 | /* Fetch a DW_AT_const_value through a synthetic pointer. */ |
1922 | ||
1923 | static struct value * | |
1924 | fetch_const_value_from_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
1925 | struct dwarf2_per_cu_data *per_cu, | |
1926 | struct type *type) | |
1927 | { | |
1928 | struct value *result = NULL; | |
3326303b MG |
1929 | const gdb_byte *bytes; |
1930 | LONGEST len; | |
1931 | ||
8268c778 | 1932 | auto_obstack temp_obstack; |
3326303b MG |
1933 | bytes = dwarf2_fetch_constant_bytes (die, per_cu, &temp_obstack, &len); |
1934 | ||
1935 | if (bytes != NULL) | |
1936 | { | |
1937 | if (byte_offset >= 0 | |
1938 | && byte_offset + TYPE_LENGTH (TYPE_TARGET_TYPE (type)) <= len) | |
1939 | { | |
1940 | bytes += byte_offset; | |
1941 | result = value_from_contents (TYPE_TARGET_TYPE (type), bytes); | |
1942 | } | |
1943 | else | |
1944 | invalid_synthetic_pointer (); | |
1945 | } | |
1946 | else | |
1947 | result = allocate_optimized_out_value (TYPE_TARGET_TYPE (type)); | |
1948 | ||
3326303b MG |
1949 | return result; |
1950 | } | |
1951 | ||
1952 | /* Fetch the value pointed to by a synthetic pointer. */ | |
1953 | ||
1954 | static struct value * | |
1955 | indirect_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
1956 | struct dwarf2_per_cu_data *per_cu, | |
e4a62c65 TV |
1957 | struct frame_info *frame, struct type *type, |
1958 | bool resolve_abstract_p) | |
3326303b MG |
1959 | { |
1960 | /* Fetch the location expression of the DIE we're pointing to. */ | |
1961 | struct dwarf2_locexpr_baton baton | |
1962 | = dwarf2_fetch_die_loc_sect_off (die, per_cu, | |
e4a62c65 TV |
1963 | get_frame_address_in_block_wrapper, frame, |
1964 | resolve_abstract_p); | |
3326303b | 1965 | |
7942e96e AA |
1966 | /* Get type of pointed-to DIE. */ |
1967 | struct type *orig_type = dwarf2_fetch_die_type_sect_off (die, per_cu); | |
1968 | if (orig_type == NULL) | |
1969 | invalid_synthetic_pointer (); | |
1970 | ||
3326303b MG |
1971 | /* If pointed-to DIE has a DW_AT_location, evaluate it and return the |
1972 | resulting value. Otherwise, it may have a DW_AT_const_value instead, | |
1973 | or it may've been optimized out. */ | |
1974 | if (baton.data != NULL) | |
7942e96e AA |
1975 | return dwarf2_evaluate_loc_desc_full (orig_type, frame, baton.data, |
1976 | baton.size, baton.per_cu, | |
1977 | TYPE_TARGET_TYPE (type), | |
3326303b MG |
1978 | byte_offset); |
1979 | else | |
1980 | return fetch_const_value_from_synthetic_pointer (die, byte_offset, per_cu, | |
1981 | type); | |
1982 | } | |
1983 | ||
8cf6f0b1 TT |
1984 | /* An implementation of an lval_funcs method to indirect through a |
1985 | pointer. This handles the synthetic pointer case when needed. */ | |
1986 | ||
1987 | static struct value * | |
1988 | indirect_pieced_value (struct value *value) | |
1989 | { | |
1990 | struct piece_closure *c | |
1991 | = (struct piece_closure *) value_computed_closure (value); | |
1992 | struct type *type; | |
1993 | struct frame_info *frame; | |
6b850546 DT |
1994 | int i, bit_length; |
1995 | LONGEST bit_offset; | |
8cf6f0b1 | 1996 | struct dwarf_expr_piece *piece = NULL; |
8cf6f0b1 | 1997 | LONGEST byte_offset; |
b597c318 | 1998 | enum bfd_endian byte_order; |
8cf6f0b1 | 1999 | |
0e37a63c | 2000 | type = check_typedef (value_type (value)); |
8cf6f0b1 TT |
2001 | if (TYPE_CODE (type) != TYPE_CODE_PTR) |
2002 | return NULL; | |
2003 | ||
2004 | bit_length = 8 * TYPE_LENGTH (type); | |
2005 | bit_offset = 8 * value_offset (value); | |
2006 | if (value_bitsize (value)) | |
2007 | bit_offset += value_bitpos (value); | |
2008 | ||
1e467161 | 2009 | for (i = 0; i < c->pieces.size () && bit_length > 0; i++) |
8cf6f0b1 TT |
2010 | { |
2011 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2012 | size_t this_size_bits = p->size; | |
2013 | ||
2014 | if (bit_offset > 0) | |
2015 | { | |
2016 | if (bit_offset >= this_size_bits) | |
2017 | { | |
2018 | bit_offset -= this_size_bits; | |
2019 | continue; | |
2020 | } | |
2021 | ||
2022 | bit_length -= this_size_bits - bit_offset; | |
2023 | bit_offset = 0; | |
2024 | } | |
2025 | else | |
2026 | bit_length -= this_size_bits; | |
2027 | ||
2028 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
2029 | return NULL; | |
2030 | ||
2031 | if (bit_length != 0) | |
216f72a1 | 2032 | error (_("Invalid use of DW_OP_implicit_pointer")); |
8cf6f0b1 TT |
2033 | |
2034 | piece = p; | |
2035 | break; | |
2036 | } | |
2037 | ||
3326303b | 2038 | gdb_assert (piece != NULL); |
8cf6f0b1 | 2039 | frame = get_selected_frame (_("No frame selected.")); |
543305c9 | 2040 | |
5bd1ef56 TT |
2041 | /* This is an offset requested by GDB, such as value subscripts. |
2042 | However, due to how synthetic pointers are implemented, this is | |
2043 | always presented to us as a pointer type. This means we have to | |
b597c318 YQ |
2044 | sign-extend it manually as appropriate. Use raw |
2045 | extract_signed_integer directly rather than value_as_address and | |
2046 | sign extend afterwards on architectures that would need it | |
2047 | (mostly everywhere except MIPS, which has signed addresses) as | |
2048 | the later would go through gdbarch_pointer_to_address and thus | |
2049 | return a CORE_ADDR with high bits set on architectures that | |
2050 | encode address spaces and other things in CORE_ADDR. */ | |
2051 | byte_order = gdbarch_byte_order (get_frame_arch (frame)); | |
2052 | byte_offset = extract_signed_integer (value_contents (value), | |
2053 | TYPE_LENGTH (type), byte_order); | |
5bd1ef56 | 2054 | byte_offset += piece->v.ptr.offset; |
8cf6f0b1 | 2055 | |
9c541725 PA |
2056 | return indirect_synthetic_pointer (piece->v.ptr.die_sect_off, |
2057 | byte_offset, c->per_cu, | |
3326303b MG |
2058 | frame, type); |
2059 | } | |
8cf6f0b1 | 2060 | |
3326303b MG |
2061 | /* Implementation of the coerce_ref method of lval_funcs for synthetic C++ |
2062 | references. */ | |
b6807d98 | 2063 | |
3326303b MG |
2064 | static struct value * |
2065 | coerce_pieced_ref (const struct value *value) | |
2066 | { | |
2067 | struct type *type = check_typedef (value_type (value)); | |
b6807d98 | 2068 | |
3326303b MG |
2069 | if (value_bits_synthetic_pointer (value, value_embedded_offset (value), |
2070 | TARGET_CHAR_BIT * TYPE_LENGTH (type))) | |
2071 | { | |
2072 | const struct piece_closure *closure | |
2073 | = (struct piece_closure *) value_computed_closure (value); | |
2074 | struct frame_info *frame | |
2075 | = get_selected_frame (_("No frame selected.")); | |
2076 | ||
2077 | /* gdb represents synthetic pointers as pieced values with a single | |
2078 | piece. */ | |
2079 | gdb_assert (closure != NULL); | |
1e467161 | 2080 | gdb_assert (closure->pieces.size () == 1); |
3326303b | 2081 | |
1e467161 SM |
2082 | return indirect_synthetic_pointer |
2083 | (closure->pieces[0].v.ptr.die_sect_off, | |
2084 | closure->pieces[0].v.ptr.offset, | |
2085 | closure->per_cu, frame, type); | |
3326303b MG |
2086 | } |
2087 | else | |
2088 | { | |
2089 | /* Else: not a synthetic reference; do nothing. */ | |
2090 | return NULL; | |
2091 | } | |
0e03807e TT |
2092 | } |
2093 | ||
052b9502 | 2094 | static void * |
0e03807e | 2095 | copy_pieced_value_closure (const struct value *v) |
052b9502 | 2096 | { |
3e43a32a MS |
2097 | struct piece_closure *c |
2098 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2099 | |
88bfdde4 TT |
2100 | ++c->refc; |
2101 | return c; | |
052b9502 NF |
2102 | } |
2103 | ||
2104 | static void | |
2105 | free_pieced_value_closure (struct value *v) | |
2106 | { | |
3e43a32a MS |
2107 | struct piece_closure *c |
2108 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2109 | |
88bfdde4 TT |
2110 | --c->refc; |
2111 | if (c->refc == 0) | |
2112 | { | |
1e467161 SM |
2113 | for (dwarf_expr_piece &p : c->pieces) |
2114 | if (p.location == DWARF_VALUE_STACK) | |
22bc8444 | 2115 | value_decref (p.v.value); |
8a9b8146 | 2116 | |
1e467161 | 2117 | delete c; |
88bfdde4 | 2118 | } |
052b9502 NF |
2119 | } |
2120 | ||
2121 | /* Functions for accessing a variable described by DW_OP_piece. */ | |
c8f2448a | 2122 | static const struct lval_funcs pieced_value_funcs = { |
052b9502 NF |
2123 | read_pieced_value, |
2124 | write_pieced_value, | |
8cf6f0b1 | 2125 | indirect_pieced_value, |
3326303b | 2126 | coerce_pieced_ref, |
8cf6f0b1 | 2127 | check_pieced_synthetic_pointer, |
052b9502 NF |
2128 | copy_pieced_value_closure, |
2129 | free_pieced_value_closure | |
2130 | }; | |
2131 | ||
4c2df51b | 2132 | /* Evaluate a location description, starting at DATA and with length |
8cf6f0b1 | 2133 | SIZE, to find the current location of variable of TYPE in the |
7942e96e AA |
2134 | context of FRAME. If SUBOBJ_TYPE is non-NULL, return instead the |
2135 | location of the subobject of type SUBOBJ_TYPE at byte offset | |
2136 | SUBOBJ_BYTE_OFFSET within the variable of type TYPE. */ | |
a2d33775 | 2137 | |
8cf6f0b1 TT |
2138 | static struct value * |
2139 | dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame, | |
56eb65bd | 2140 | const gdb_byte *data, size_t size, |
8cf6f0b1 | 2141 | struct dwarf2_per_cu_data *per_cu, |
7942e96e AA |
2142 | struct type *subobj_type, |
2143 | LONGEST subobj_byte_offset) | |
4c2df51b | 2144 | { |
4c2df51b | 2145 | struct value *retval; |
ac56253d | 2146 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b | 2147 | |
7942e96e AA |
2148 | if (subobj_type == NULL) |
2149 | { | |
2150 | subobj_type = type; | |
2151 | subobj_byte_offset = 0; | |
2152 | } | |
2153 | else if (subobj_byte_offset < 0) | |
8cf6f0b1 TT |
2154 | invalid_synthetic_pointer (); |
2155 | ||
0d53c4c4 | 2156 | if (size == 0) |
7942e96e | 2157 | return allocate_optimized_out_value (subobj_type); |
0d53c4c4 | 2158 | |
192ca6d8 TT |
2159 | dwarf_evaluate_loc_desc ctx; |
2160 | ctx.frame = frame; | |
2161 | ctx.per_cu = per_cu; | |
2162 | ctx.obj_address = 0; | |
4c2df51b | 2163 | |
0cf08227 | 2164 | scoped_value_mark free_values; |
4a227398 | 2165 | |
718b9626 TT |
2166 | ctx.gdbarch = get_objfile_arch (objfile); |
2167 | ctx.addr_size = dwarf2_per_cu_addr_size (per_cu); | |
2168 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); | |
2169 | ctx.offset = dwarf2_per_cu_text_offset (per_cu); | |
4c2df51b | 2170 | |
492d29ea | 2171 | TRY |
79e1a869 | 2172 | { |
595d2e30 | 2173 | ctx.eval (data, size); |
79e1a869 | 2174 | } |
492d29ea | 2175 | CATCH (ex, RETURN_MASK_ERROR) |
79e1a869 PA |
2176 | { |
2177 | if (ex.error == NOT_AVAILABLE_ERROR) | |
2178 | { | |
0cf08227 | 2179 | free_values.free_to_mark (); |
7942e96e AA |
2180 | retval = allocate_value (subobj_type); |
2181 | mark_value_bytes_unavailable (retval, 0, | |
2182 | TYPE_LENGTH (subobj_type)); | |
79e1a869 PA |
2183 | return retval; |
2184 | } | |
8e3b41a9 JK |
2185 | else if (ex.error == NO_ENTRY_VALUE_ERROR) |
2186 | { | |
2187 | if (entry_values_debug) | |
2188 | exception_print (gdb_stdout, ex); | |
0cf08227 | 2189 | free_values.free_to_mark (); |
7942e96e | 2190 | return allocate_optimized_out_value (subobj_type); |
8e3b41a9 | 2191 | } |
79e1a869 PA |
2192 | else |
2193 | throw_exception (ex); | |
2194 | } | |
492d29ea | 2195 | END_CATCH |
79e1a869 | 2196 | |
1e467161 | 2197 | if (ctx.pieces.size () > 0) |
87808bd6 | 2198 | { |
052b9502 | 2199 | struct piece_closure *c; |
8cf6f0b1 | 2200 | ULONGEST bit_size = 0; |
052b9502 | 2201 | |
1e467161 SM |
2202 | for (dwarf_expr_piece &piece : ctx.pieces) |
2203 | bit_size += piece.size; | |
03278692 TT |
2204 | /* Complain if the expression is larger than the size of the |
2205 | outer type. */ | |
2206 | if (bit_size > 8 * TYPE_LENGTH (type)) | |
8cf6f0b1 TT |
2207 | invalid_synthetic_pointer (); |
2208 | ||
1e467161 | 2209 | c = allocate_piece_closure (per_cu, std::move (ctx.pieces), frame); |
72fc29ff TT |
2210 | /* We must clean up the value chain after creating the piece |
2211 | closure but before allocating the result. */ | |
0cf08227 | 2212 | free_values.free_to_mark (); |
7942e96e AA |
2213 | retval = allocate_computed_value (subobj_type, |
2214 | &pieced_value_funcs, c); | |
2215 | set_value_offset (retval, subobj_byte_offset); | |
87808bd6 | 2216 | } |
4c2df51b DJ |
2217 | else |
2218 | { | |
718b9626 | 2219 | switch (ctx.location) |
cec03d70 TT |
2220 | { |
2221 | case DWARF_VALUE_REGISTER: | |
2222 | { | |
2223 | struct gdbarch *arch = get_frame_arch (frame); | |
7c33b57c | 2224 | int dwarf_regnum |
595d2e30 | 2225 | = longest_to_int (value_as_long (ctx.fetch (0))); |
0fde2c53 | 2226 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, dwarf_regnum); |
9a619af0 | 2227 | |
7942e96e | 2228 | if (subobj_byte_offset != 0) |
8cf6f0b1 | 2229 | error (_("cannot use offset on synthetic pointer to register")); |
0cf08227 | 2230 | free_values.free_to_mark (); |
7942e96e | 2231 | retval = value_from_register (subobj_type, gdb_regnum, frame); |
0fde2c53 DE |
2232 | if (value_optimized_out (retval)) |
2233 | { | |
2234 | struct value *tmp; | |
2235 | ||
2236 | /* This means the register has undefined value / was | |
2237 | not saved. As we're computing the location of some | |
2238 | variable etc. in the program, not a value for | |
2239 | inspecting a register ($pc, $sp, etc.), return a | |
2240 | generic optimized out value instead, so that we show | |
2241 | <optimized out> instead of <not saved>. */ | |
7942e96e AA |
2242 | tmp = allocate_value (subobj_type); |
2243 | value_contents_copy (tmp, 0, retval, 0, | |
2244 | TYPE_LENGTH (subobj_type)); | |
0fde2c53 DE |
2245 | retval = tmp; |
2246 | } | |
cec03d70 TT |
2247 | } |
2248 | break; | |
2249 | ||
2250 | case DWARF_VALUE_MEMORY: | |
2251 | { | |
f56331b4 | 2252 | struct type *ptr_type; |
595d2e30 | 2253 | CORE_ADDR address = ctx.fetch_address (0); |
69009882 | 2254 | bool in_stack_memory = ctx.fetch_in_stack_memory (0); |
cec03d70 | 2255 | |
f56331b4 KB |
2256 | /* DW_OP_deref_size (and possibly other operations too) may |
2257 | create a pointer instead of an address. Ideally, the | |
2258 | pointer to address conversion would be performed as part | |
2259 | of those operations, but the type of the object to | |
2260 | which the address refers is not known at the time of | |
2261 | the operation. Therefore, we do the conversion here | |
2262 | since the type is readily available. */ | |
2263 | ||
7942e96e | 2264 | switch (TYPE_CODE (subobj_type)) |
f56331b4 KB |
2265 | { |
2266 | case TYPE_CODE_FUNC: | |
2267 | case TYPE_CODE_METHOD: | |
718b9626 | 2268 | ptr_type = builtin_type (ctx.gdbarch)->builtin_func_ptr; |
f56331b4 KB |
2269 | break; |
2270 | default: | |
718b9626 | 2271 | ptr_type = builtin_type (ctx.gdbarch)->builtin_data_ptr; |
f56331b4 KB |
2272 | break; |
2273 | } | |
2274 | address = value_as_address (value_from_pointer (ptr_type, address)); | |
2275 | ||
0cf08227 | 2276 | free_values.free_to_mark (); |
7942e96e AA |
2277 | retval = value_at_lazy (subobj_type, |
2278 | address + subobj_byte_offset); | |
44353522 DE |
2279 | if (in_stack_memory) |
2280 | set_value_stack (retval, 1); | |
cec03d70 TT |
2281 | } |
2282 | break; | |
2283 | ||
2284 | case DWARF_VALUE_STACK: | |
2285 | { | |
595d2e30 | 2286 | struct value *value = ctx.fetch (0); |
8a9b8146 | 2287 | size_t n = TYPE_LENGTH (value_type (value)); |
7942e96e AA |
2288 | size_t len = TYPE_LENGTH (subobj_type); |
2289 | size_t max = TYPE_LENGTH (type); | |
2290 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
cec03d70 | 2291 | |
7942e96e | 2292 | if (subobj_byte_offset + len > max) |
8cf6f0b1 TT |
2293 | invalid_synthetic_pointer (); |
2294 | ||
72fc29ff TT |
2295 | /* Preserve VALUE because we are going to free values back |
2296 | to the mark, but we still need the value contents | |
2297 | below. */ | |
bbfa6f00 | 2298 | value_ref_ptr value_holder = value_ref_ptr::new_reference (value); |
0cf08227 | 2299 | free_values.free_to_mark (); |
72fc29ff | 2300 | |
7942e96e | 2301 | retval = allocate_value (subobj_type); |
b6cede78 | 2302 | |
7942e96e AA |
2303 | /* The given offset is relative to the actual object. */ |
2304 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2305 | subobj_byte_offset += n - max; | |
2306 | ||
2307 | memcpy (value_contents_raw (retval), | |
2308 | value_contents_all (value) + subobj_byte_offset, len); | |
cec03d70 TT |
2309 | } |
2310 | break; | |
2311 | ||
2312 | case DWARF_VALUE_LITERAL: | |
2313 | { | |
2314 | bfd_byte *contents; | |
7942e96e | 2315 | size_t n = TYPE_LENGTH (subobj_type); |
cec03d70 | 2316 | |
7942e96e | 2317 | if (subobj_byte_offset + n > ctx.len) |
8cf6f0b1 TT |
2318 | invalid_synthetic_pointer (); |
2319 | ||
0cf08227 | 2320 | free_values.free_to_mark (); |
7942e96e | 2321 | retval = allocate_value (subobj_type); |
cec03d70 | 2322 | contents = value_contents_raw (retval); |
7942e96e | 2323 | memcpy (contents, ctx.data + subobj_byte_offset, n); |
cec03d70 TT |
2324 | } |
2325 | break; | |
2326 | ||
dd90784c | 2327 | case DWARF_VALUE_OPTIMIZED_OUT: |
0cf08227 | 2328 | free_values.free_to_mark (); |
7942e96e | 2329 | retval = allocate_optimized_out_value (subobj_type); |
dd90784c JK |
2330 | break; |
2331 | ||
8cf6f0b1 TT |
2332 | /* DWARF_VALUE_IMPLICIT_POINTER was converted to a pieced |
2333 | operation by execute_stack_op. */ | |
2334 | case DWARF_VALUE_IMPLICIT_POINTER: | |
cb826367 TT |
2335 | /* DWARF_VALUE_OPTIMIZED_OUT can't occur in this context -- |
2336 | it can only be encountered when making a piece. */ | |
cec03d70 TT |
2337 | default: |
2338 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
2339 | } | |
4c2df51b DJ |
2340 | } |
2341 | ||
718b9626 | 2342 | set_value_initialized (retval, ctx.initialized); |
42be36b3 | 2343 | |
4c2df51b DJ |
2344 | return retval; |
2345 | } | |
8cf6f0b1 TT |
2346 | |
2347 | /* The exported interface to dwarf2_evaluate_loc_desc_full; it always | |
2348 | passes 0 as the byte_offset. */ | |
2349 | ||
2350 | struct value * | |
2351 | dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame, | |
56eb65bd | 2352 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2353 | struct dwarf2_per_cu_data *per_cu) |
2354 | { | |
7942e96e AA |
2355 | return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, |
2356 | NULL, 0); | |
8cf6f0b1 TT |
2357 | } |
2358 | ||
80180f79 | 2359 | /* Evaluates a dwarf expression and stores the result in VAL, expecting |
63e43d3a PMR |
2360 | that the dwarf expression only produces a single CORE_ADDR. FRAME is the |
2361 | frame in which the expression is evaluated. ADDR is a context (location of | |
2362 | a variable) and might be needed to evaluate the location expression. | |
80180f79 SA |
2363 | Returns 1 on success, 0 otherwise. */ |
2364 | ||
2365 | static int | |
2366 | dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton, | |
63e43d3a | 2367 | struct frame_info *frame, |
08412b07 | 2368 | CORE_ADDR addr, |
1cfdf534 | 2369 | CORE_ADDR *valp) |
80180f79 | 2370 | { |
80180f79 | 2371 | struct objfile *objfile; |
80180f79 SA |
2372 | |
2373 | if (dlbaton == NULL || dlbaton->size == 0) | |
2374 | return 0; | |
2375 | ||
192ca6d8 | 2376 | dwarf_evaluate_loc_desc ctx; |
80180f79 | 2377 | |
192ca6d8 TT |
2378 | ctx.frame = frame; |
2379 | ctx.per_cu = dlbaton->per_cu; | |
2380 | ctx.obj_address = addr; | |
80180f79 SA |
2381 | |
2382 | objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); | |
2383 | ||
718b9626 TT |
2384 | ctx.gdbarch = get_objfile_arch (objfile); |
2385 | ctx.addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
2386 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (dlbaton->per_cu); | |
2387 | ctx.offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); | |
80180f79 | 2388 | |
16f808ec TV |
2389 | TRY |
2390 | { | |
2391 | ctx.eval (dlbaton->data, dlbaton->size); | |
2392 | } | |
2393 | CATCH (ex, RETURN_MASK_ERROR) | |
2394 | { | |
2395 | if (ex.error == NOT_AVAILABLE_ERROR) | |
2396 | { | |
2397 | return 0; | |
2398 | } | |
2399 | else if (ex.error == NO_ENTRY_VALUE_ERROR) | |
2400 | { | |
2401 | if (entry_values_debug) | |
2402 | exception_print (gdb_stdout, ex); | |
2403 | return 0; | |
2404 | } | |
2405 | else | |
2406 | throw_exception (ex); | |
2407 | } | |
2408 | END_CATCH | |
80180f79 | 2409 | |
718b9626 | 2410 | switch (ctx.location) |
80180f79 SA |
2411 | { |
2412 | case DWARF_VALUE_REGISTER: | |
2413 | case DWARF_VALUE_MEMORY: | |
2414 | case DWARF_VALUE_STACK: | |
595d2e30 | 2415 | *valp = ctx.fetch_address (0); |
718b9626 | 2416 | if (ctx.location == DWARF_VALUE_REGISTER) |
192ca6d8 | 2417 | *valp = ctx.read_addr_from_reg (*valp); |
80180f79 SA |
2418 | return 1; |
2419 | case DWARF_VALUE_LITERAL: | |
718b9626 TT |
2420 | *valp = extract_signed_integer (ctx.data, ctx.len, |
2421 | gdbarch_byte_order (ctx.gdbarch)); | |
80180f79 SA |
2422 | return 1; |
2423 | /* Unsupported dwarf values. */ | |
2424 | case DWARF_VALUE_OPTIMIZED_OUT: | |
2425 | case DWARF_VALUE_IMPLICIT_POINTER: | |
2426 | break; | |
2427 | } | |
2428 | ||
80180f79 SA |
2429 | return 0; |
2430 | } | |
2431 | ||
2432 | /* See dwarf2loc.h. */ | |
2433 | ||
2434 | int | |
08412b07 | 2435 | dwarf2_evaluate_property (const struct dynamic_prop *prop, |
63e43d3a | 2436 | struct frame_info *frame, |
df25ebbd JB |
2437 | struct property_addr_info *addr_stack, |
2438 | CORE_ADDR *value) | |
80180f79 SA |
2439 | { |
2440 | if (prop == NULL) | |
2441 | return 0; | |
2442 | ||
63e43d3a PMR |
2443 | if (frame == NULL && has_stack_frames ()) |
2444 | frame = get_selected_frame (NULL); | |
2445 | ||
80180f79 SA |
2446 | switch (prop->kind) |
2447 | { | |
2448 | case PROP_LOCEXPR: | |
2449 | { | |
9a3c8263 SM |
2450 | const struct dwarf2_property_baton *baton |
2451 | = (const struct dwarf2_property_baton *) prop->data.baton; | |
80180f79 | 2452 | |
63e43d3a PMR |
2453 | if (dwarf2_locexpr_baton_eval (&baton->locexpr, frame, |
2454 | addr_stack ? addr_stack->addr : 0, | |
df25ebbd | 2455 | value)) |
80180f79 SA |
2456 | { |
2457 | if (baton->referenced_type) | |
2458 | { | |
2459 | struct value *val = value_at (baton->referenced_type, *value); | |
2460 | ||
2461 | *value = value_as_address (val); | |
2462 | } | |
2463 | return 1; | |
2464 | } | |
2465 | } | |
2466 | break; | |
2467 | ||
2468 | case PROP_LOCLIST: | |
2469 | { | |
9a3c8263 SM |
2470 | struct dwarf2_property_baton *baton |
2471 | = (struct dwarf2_property_baton *) prop->data.baton; | |
80180f79 SA |
2472 | CORE_ADDR pc = get_frame_address_in_block (frame); |
2473 | const gdb_byte *data; | |
2474 | struct value *val; | |
2475 | size_t size; | |
2476 | ||
2477 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2478 | if (data != NULL) | |
2479 | { | |
2480 | val = dwarf2_evaluate_loc_desc (baton->referenced_type, frame, data, | |
2481 | size, baton->loclist.per_cu); | |
2482 | if (!value_optimized_out (val)) | |
2483 | { | |
2484 | *value = value_as_address (val); | |
2485 | return 1; | |
2486 | } | |
2487 | } | |
2488 | } | |
2489 | break; | |
2490 | ||
2491 | case PROP_CONST: | |
2492 | *value = prop->data.const_val; | |
2493 | return 1; | |
df25ebbd JB |
2494 | |
2495 | case PROP_ADDR_OFFSET: | |
2496 | { | |
9a3c8263 SM |
2497 | struct dwarf2_property_baton *baton |
2498 | = (struct dwarf2_property_baton *) prop->data.baton; | |
df25ebbd JB |
2499 | struct property_addr_info *pinfo; |
2500 | struct value *val; | |
2501 | ||
2502 | for (pinfo = addr_stack; pinfo != NULL; pinfo = pinfo->next) | |
2503 | if (pinfo->type == baton->referenced_type) | |
2504 | break; | |
2505 | if (pinfo == NULL) | |
2c811c0f | 2506 | error (_("cannot find reference address for offset property")); |
c3345124 JB |
2507 | if (pinfo->valaddr != NULL) |
2508 | val = value_from_contents | |
2509 | (baton->offset_info.type, | |
2510 | pinfo->valaddr + baton->offset_info.offset); | |
2511 | else | |
2512 | val = value_at (baton->offset_info.type, | |
2513 | pinfo->addr + baton->offset_info.offset); | |
df25ebbd JB |
2514 | *value = value_as_address (val); |
2515 | return 1; | |
2516 | } | |
80180f79 SA |
2517 | } |
2518 | ||
2519 | return 0; | |
2520 | } | |
2521 | ||
bb2ec1b3 TT |
2522 | /* See dwarf2loc.h. */ |
2523 | ||
2524 | void | |
d82b3862 | 2525 | dwarf2_compile_property_to_c (string_file *stream, |
bb2ec1b3 TT |
2526 | const char *result_name, |
2527 | struct gdbarch *gdbarch, | |
2528 | unsigned char *registers_used, | |
2529 | const struct dynamic_prop *prop, | |
2530 | CORE_ADDR pc, | |
2531 | struct symbol *sym) | |
2532 | { | |
9a3c8263 SM |
2533 | struct dwarf2_property_baton *baton |
2534 | = (struct dwarf2_property_baton *) prop->data.baton; | |
bb2ec1b3 TT |
2535 | const gdb_byte *data; |
2536 | size_t size; | |
2537 | struct dwarf2_per_cu_data *per_cu; | |
2538 | ||
2539 | if (prop->kind == PROP_LOCEXPR) | |
2540 | { | |
2541 | data = baton->locexpr.data; | |
2542 | size = baton->locexpr.size; | |
2543 | per_cu = baton->locexpr.per_cu; | |
2544 | } | |
2545 | else | |
2546 | { | |
2547 | gdb_assert (prop->kind == PROP_LOCLIST); | |
2548 | ||
2549 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2550 | per_cu = baton->loclist.per_cu; | |
2551 | } | |
2552 | ||
2553 | compile_dwarf_bounds_to_c (stream, result_name, prop, sym, pc, | |
2554 | gdbarch, registers_used, | |
2555 | dwarf2_per_cu_addr_size (per_cu), | |
2556 | data, data + size, per_cu); | |
2557 | } | |
2558 | ||
4c2df51b | 2559 | \f |
0b31a4bc | 2560 | /* Helper functions and baton for dwarf2_loc_desc_get_symbol_read_needs. */ |
4c2df51b | 2561 | |
192ca6d8 | 2562 | class symbol_needs_eval_context : public dwarf_expr_context |
4c2df51b | 2563 | { |
192ca6d8 TT |
2564 | public: |
2565 | ||
0b31a4bc | 2566 | enum symbol_needs_kind needs; |
17ea53c3 | 2567 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b | 2568 | |
192ca6d8 | 2569 | /* Reads from registers do require a frame. */ |
632e107b | 2570 | CORE_ADDR read_addr_from_reg (int regnum) override |
192ca6d8 TT |
2571 | { |
2572 | needs = SYMBOL_NEEDS_FRAME; | |
2573 | return 1; | |
2574 | } | |
2575 | ||
2576 | /* "get_reg_value" callback: Reads from registers do require a | |
2577 | frame. */ | |
2578 | ||
632e107b | 2579 | struct value *get_reg_value (struct type *type, int regnum) override |
192ca6d8 TT |
2580 | { |
2581 | needs = SYMBOL_NEEDS_FRAME; | |
2582 | return value_zero (type, not_lval); | |
2583 | } | |
2584 | ||
2585 | /* Reads from memory do not require a frame. */ | |
632e107b | 2586 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override |
192ca6d8 TT |
2587 | { |
2588 | memset (buf, 0, len); | |
2589 | } | |
2590 | ||
2591 | /* Frame-relative accesses do require a frame. */ | |
632e107b | 2592 | void get_frame_base (const gdb_byte **start, size_t *length) override |
192ca6d8 TT |
2593 | { |
2594 | static gdb_byte lit0 = DW_OP_lit0; | |
2595 | ||
2596 | *start = &lit0; | |
2597 | *length = 1; | |
2598 | ||
2599 | needs = SYMBOL_NEEDS_FRAME; | |
2600 | } | |
2601 | ||
2602 | /* CFA accesses require a frame. */ | |
632e107b | 2603 | CORE_ADDR get_frame_cfa () override |
192ca6d8 TT |
2604 | { |
2605 | needs = SYMBOL_NEEDS_FRAME; | |
2606 | return 1; | |
2607 | } | |
2608 | ||
632e107b | 2609 | CORE_ADDR get_frame_pc () override |
7d5697f9 TT |
2610 | { |
2611 | needs = SYMBOL_NEEDS_FRAME; | |
2612 | return 1; | |
2613 | } | |
2614 | ||
192ca6d8 | 2615 | /* Thread-local accesses require registers, but not a frame. */ |
632e107b | 2616 | CORE_ADDR get_tls_address (CORE_ADDR offset) override |
192ca6d8 TT |
2617 | { |
2618 | if (needs <= SYMBOL_NEEDS_REGISTERS) | |
2619 | needs = SYMBOL_NEEDS_REGISTERS; | |
2620 | return 1; | |
2621 | } | |
2622 | ||
2623 | /* Helper interface of per_cu_dwarf_call for | |
2624 | dwarf2_loc_desc_get_symbol_read_needs. */ | |
2625 | ||
632e107b | 2626 | void dwarf_call (cu_offset die_offset) override |
192ca6d8 TT |
2627 | { |
2628 | per_cu_dwarf_call (this, die_offset, per_cu); | |
2629 | } | |
2630 | ||
a6b786da KB |
2631 | /* Helper interface of sect_variable_value for |
2632 | dwarf2_loc_desc_get_symbol_read_needs. */ | |
2633 | ||
2634 | struct value *dwarf_variable_value (sect_offset sect_off) override | |
2635 | { | |
2636 | return sect_variable_value (this, sect_off, per_cu); | |
2637 | } | |
2638 | ||
216f72a1 | 2639 | /* DW_OP_entry_value accesses require a caller, therefore a |
192ca6d8 TT |
2640 | frame. */ |
2641 | ||
2642 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
2643 | union call_site_parameter_u kind_u, | |
632e107b | 2644 | int deref_size) override |
192ca6d8 TT |
2645 | { |
2646 | needs = SYMBOL_NEEDS_FRAME; | |
3019eac3 | 2647 | |
192ca6d8 TT |
2648 | /* The expression may require some stub values on DWARF stack. */ |
2649 | push_address (0, 0); | |
2650 | } | |
3019eac3 | 2651 | |
192ca6d8 | 2652 | /* DW_OP_GNU_addr_index doesn't require a frame. */ |
08412b07 | 2653 | |
632e107b | 2654 | CORE_ADDR get_addr_index (unsigned int index) override |
192ca6d8 TT |
2655 | { |
2656 | /* Nothing to do. */ | |
2657 | return 1; | |
2658 | } | |
08412b07 | 2659 | |
192ca6d8 | 2660 | /* DW_OP_push_object_address has a frame already passed through. */ |
9e8b7a03 | 2661 | |
632e107b | 2662 | CORE_ADDR get_object_address () override |
192ca6d8 TT |
2663 | { |
2664 | /* Nothing to do. */ | |
2665 | return 1; | |
2666 | } | |
9e8b7a03 JK |
2667 | }; |
2668 | ||
0b31a4bc TT |
2669 | /* Compute the correct symbol_needs_kind value for the location |
2670 | expression at DATA (length SIZE). */ | |
4c2df51b | 2671 | |
0b31a4bc TT |
2672 | static enum symbol_needs_kind |
2673 | dwarf2_loc_desc_get_symbol_read_needs (const gdb_byte *data, size_t size, | |
2674 | struct dwarf2_per_cu_data *per_cu) | |
4c2df51b | 2675 | { |
f630a401 | 2676 | int in_reg; |
ac56253d | 2677 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b | 2678 | |
eb115069 TT |
2679 | scoped_value_mark free_values; |
2680 | ||
192ca6d8 TT |
2681 | symbol_needs_eval_context ctx; |
2682 | ||
2683 | ctx.needs = SYMBOL_NEEDS_NONE; | |
2684 | ctx.per_cu = per_cu; | |
718b9626 TT |
2685 | ctx.gdbarch = get_objfile_arch (objfile); |
2686 | ctx.addr_size = dwarf2_per_cu_addr_size (per_cu); | |
2687 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); | |
2688 | ctx.offset = dwarf2_per_cu_text_offset (per_cu); | |
4c2df51b | 2689 | |
595d2e30 | 2690 | ctx.eval (data, size); |
4c2df51b | 2691 | |
718b9626 | 2692 | in_reg = ctx.location == DWARF_VALUE_REGISTER; |
f630a401 | 2693 | |
1e467161 SM |
2694 | /* If the location has several pieces, and any of them are in |
2695 | registers, then we will need a frame to fetch them from. */ | |
2696 | for (dwarf_expr_piece &p : ctx.pieces) | |
2697 | if (p.location == DWARF_VALUE_REGISTER) | |
2698 | in_reg = 1; | |
87808bd6 | 2699 | |
0b31a4bc | 2700 | if (in_reg) |
192ca6d8 TT |
2701 | ctx.needs = SYMBOL_NEEDS_FRAME; |
2702 | return ctx.needs; | |
4c2df51b DJ |
2703 | } |
2704 | ||
3cf03773 TT |
2705 | /* A helper function that throws an unimplemented error mentioning a |
2706 | given DWARF operator. */ | |
2707 | ||
621846f4 | 2708 | static void ATTRIBUTE_NORETURN |
3cf03773 | 2709 | unimplemented (unsigned int op) |
0d53c4c4 | 2710 | { |
f39c6ffd | 2711 | const char *name = get_DW_OP_name (op); |
b1bfef65 TT |
2712 | |
2713 | if (name) | |
2714 | error (_("DWARF operator %s cannot be translated to an agent expression"), | |
2715 | name); | |
2716 | else | |
1ba1b353 TT |
2717 | error (_("Unknown DWARF operator 0x%02x cannot be translated " |
2718 | "to an agent expression"), | |
b1bfef65 | 2719 | op); |
3cf03773 | 2720 | } |
08922a10 | 2721 | |
0fde2c53 DE |
2722 | /* See dwarf2loc.h. |
2723 | ||
2724 | This is basically a wrapper on gdbarch_dwarf2_reg_to_regnum so that we | |
2725 | can issue a complaint, which is better than having every target's | |
2726 | implementation of dwarf2_reg_to_regnum do it. */ | |
08922a10 | 2727 | |
d064d1be | 2728 | int |
0fde2c53 | 2729 | dwarf_reg_to_regnum (struct gdbarch *arch, int dwarf_reg) |
3cf03773 TT |
2730 | { |
2731 | int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg); | |
0fde2c53 | 2732 | |
3cf03773 | 2733 | if (reg == -1) |
0fde2c53 | 2734 | { |
b98664d3 | 2735 | complaint (_("bad DWARF register number %d"), dwarf_reg); |
0fde2c53 DE |
2736 | } |
2737 | return reg; | |
2738 | } | |
2739 | ||
2740 | /* Subroutine of dwarf_reg_to_regnum_or_error to simplify it. | |
2741 | Throw an error because DWARF_REG is bad. */ | |
2742 | ||
2743 | static void | |
2744 | throw_bad_regnum_error (ULONGEST dwarf_reg) | |
2745 | { | |
2746 | /* Still want to print -1 as "-1". | |
2747 | We *could* have int and ULONGEST versions of dwarf2_reg_to_regnum_or_error | |
2748 | but that's overkill for now. */ | |
2749 | if ((int) dwarf_reg == dwarf_reg) | |
2750 | error (_("Unable to access DWARF register number %d"), (int) dwarf_reg); | |
2751 | error (_("Unable to access DWARF register number %s"), | |
2752 | pulongest (dwarf_reg)); | |
2753 | } | |
2754 | ||
2755 | /* See dwarf2loc.h. */ | |
2756 | ||
2757 | int | |
2758 | dwarf_reg_to_regnum_or_error (struct gdbarch *arch, ULONGEST dwarf_reg) | |
2759 | { | |
2760 | int reg; | |
2761 | ||
2762 | if (dwarf_reg > INT_MAX) | |
2763 | throw_bad_regnum_error (dwarf_reg); | |
2764 | /* Yes, we will end up issuing a complaint and an error if DWARF_REG is | |
2765 | bad, but that's ok. */ | |
2766 | reg = dwarf_reg_to_regnum (arch, (int) dwarf_reg); | |
2767 | if (reg == -1) | |
2768 | throw_bad_regnum_error (dwarf_reg); | |
3cf03773 TT |
2769 | return reg; |
2770 | } | |
08922a10 | 2771 | |
3cf03773 TT |
2772 | /* A helper function that emits an access to memory. ARCH is the |
2773 | target architecture. EXPR is the expression which we are building. | |
2774 | NBITS is the number of bits we want to read. This emits the | |
2775 | opcodes needed to read the memory and then extract the desired | |
2776 | bits. */ | |
08922a10 | 2777 | |
3cf03773 TT |
2778 | static void |
2779 | access_memory (struct gdbarch *arch, struct agent_expr *expr, ULONGEST nbits) | |
08922a10 | 2780 | { |
3cf03773 TT |
2781 | ULONGEST nbytes = (nbits + 7) / 8; |
2782 | ||
9df7235c | 2783 | gdb_assert (nbytes > 0 && nbytes <= sizeof (LONGEST)); |
3cf03773 | 2784 | |
92bc6a20 | 2785 | if (expr->tracing) |
3cf03773 TT |
2786 | ax_trace_quick (expr, nbytes); |
2787 | ||
2788 | if (nbits <= 8) | |
2789 | ax_simple (expr, aop_ref8); | |
2790 | else if (nbits <= 16) | |
2791 | ax_simple (expr, aop_ref16); | |
2792 | else if (nbits <= 32) | |
2793 | ax_simple (expr, aop_ref32); | |
2794 | else | |
2795 | ax_simple (expr, aop_ref64); | |
2796 | ||
2797 | /* If we read exactly the number of bytes we wanted, we're done. */ | |
2798 | if (8 * nbytes == nbits) | |
2799 | return; | |
2800 | ||
2801 | if (gdbarch_bits_big_endian (arch)) | |
0d53c4c4 | 2802 | { |
3cf03773 TT |
2803 | /* On a bits-big-endian machine, we want the high-order |
2804 | NBITS. */ | |
2805 | ax_const_l (expr, 8 * nbytes - nbits); | |
2806 | ax_simple (expr, aop_rsh_unsigned); | |
0d53c4c4 | 2807 | } |
3cf03773 | 2808 | else |
0d53c4c4 | 2809 | { |
3cf03773 TT |
2810 | /* On a bits-little-endian box, we want the low-order NBITS. */ |
2811 | ax_zero_ext (expr, nbits); | |
0d53c4c4 | 2812 | } |
3cf03773 | 2813 | } |
0936ad1d | 2814 | |
8cf6f0b1 TT |
2815 | /* A helper function to return the frame's PC. */ |
2816 | ||
2817 | static CORE_ADDR | |
2818 | get_ax_pc (void *baton) | |
2819 | { | |
9a3c8263 | 2820 | struct agent_expr *expr = (struct agent_expr *) baton; |
8cf6f0b1 TT |
2821 | |
2822 | return expr->scope; | |
2823 | } | |
2824 | ||
3cf03773 TT |
2825 | /* Compile a DWARF location expression to an agent expression. |
2826 | ||
2827 | EXPR is the agent expression we are building. | |
2828 | LOC is the agent value we modify. | |
2829 | ARCH is the architecture. | |
2830 | ADDR_SIZE is the size of addresses, in bytes. | |
2831 | OP_PTR is the start of the location expression. | |
2832 | OP_END is one past the last byte of the location expression. | |
2833 | ||
2834 | This will throw an exception for various kinds of errors -- for | |
2835 | example, if the expression cannot be compiled, or if the expression | |
2836 | is invalid. */ | |
0936ad1d | 2837 | |
9f6f94ff TT |
2838 | void |
2839 | dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
40f4af28 SM |
2840 | unsigned int addr_size, const gdb_byte *op_ptr, |
2841 | const gdb_byte *op_end, | |
9f6f94ff | 2842 | struct dwarf2_per_cu_data *per_cu) |
3cf03773 | 2843 | { |
40f4af28 | 2844 | gdbarch *arch = expr->gdbarch; |
58414334 | 2845 | std::vector<int> dw_labels, patches; |
3cf03773 TT |
2846 | const gdb_byte * const base = op_ptr; |
2847 | const gdb_byte *previous_piece = op_ptr; | |
2848 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
2849 | ULONGEST bits_collected = 0; | |
2850 | unsigned int addr_size_bits = 8 * addr_size; | |
2851 | int bits_big_endian = gdbarch_bits_big_endian (arch); | |
0936ad1d | 2852 | |
58414334 | 2853 | std::vector<int> offsets (op_end - op_ptr, -1); |
0936ad1d | 2854 | |
3cf03773 TT |
2855 | /* By default we are making an address. */ |
2856 | loc->kind = axs_lvalue_memory; | |
0d45f56e | 2857 | |
3cf03773 TT |
2858 | while (op_ptr < op_end) |
2859 | { | |
aead7601 | 2860 | enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr; |
9fccedf7 DE |
2861 | uint64_t uoffset, reg; |
2862 | int64_t offset; | |
3cf03773 TT |
2863 | int i; |
2864 | ||
2865 | offsets[op_ptr - base] = expr->len; | |
2866 | ++op_ptr; | |
2867 | ||
2868 | /* Our basic approach to code generation is to map DWARF | |
2869 | operations directly to AX operations. However, there are | |
2870 | some differences. | |
2871 | ||
2872 | First, DWARF works on address-sized units, but AX always uses | |
2873 | LONGEST. For most operations we simply ignore this | |
2874 | difference; instead we generate sign extensions as needed | |
2875 | before division and comparison operations. It would be nice | |
2876 | to omit the sign extensions, but there is no way to determine | |
2877 | the size of the target's LONGEST. (This code uses the size | |
2878 | of the host LONGEST in some cases -- that is a bug but it is | |
2879 | difficult to fix.) | |
2880 | ||
2881 | Second, some DWARF operations cannot be translated to AX. | |
2882 | For these we simply fail. See | |
2883 | http://sourceware.org/bugzilla/show_bug.cgi?id=11662. */ | |
2884 | switch (op) | |
0936ad1d | 2885 | { |
3cf03773 TT |
2886 | case DW_OP_lit0: |
2887 | case DW_OP_lit1: | |
2888 | case DW_OP_lit2: | |
2889 | case DW_OP_lit3: | |
2890 | case DW_OP_lit4: | |
2891 | case DW_OP_lit5: | |
2892 | case DW_OP_lit6: | |
2893 | case DW_OP_lit7: | |
2894 | case DW_OP_lit8: | |
2895 | case DW_OP_lit9: | |
2896 | case DW_OP_lit10: | |
2897 | case DW_OP_lit11: | |
2898 | case DW_OP_lit12: | |
2899 | case DW_OP_lit13: | |
2900 | case DW_OP_lit14: | |
2901 | case DW_OP_lit15: | |
2902 | case DW_OP_lit16: | |
2903 | case DW_OP_lit17: | |
2904 | case DW_OP_lit18: | |
2905 | case DW_OP_lit19: | |
2906 | case DW_OP_lit20: | |
2907 | case DW_OP_lit21: | |
2908 | case DW_OP_lit22: | |
2909 | case DW_OP_lit23: | |
2910 | case DW_OP_lit24: | |
2911 | case DW_OP_lit25: | |
2912 | case DW_OP_lit26: | |
2913 | case DW_OP_lit27: | |
2914 | case DW_OP_lit28: | |
2915 | case DW_OP_lit29: | |
2916 | case DW_OP_lit30: | |
2917 | case DW_OP_lit31: | |
2918 | ax_const_l (expr, op - DW_OP_lit0); | |
2919 | break; | |
0d53c4c4 | 2920 | |
3cf03773 | 2921 | case DW_OP_addr: |
ac56253d | 2922 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
3cf03773 | 2923 | op_ptr += addr_size; |
ac56253d TT |
2924 | /* Some versions of GCC emit DW_OP_addr before |
2925 | DW_OP_GNU_push_tls_address. In this case the value is an | |
2926 | index, not an address. We don't support things like | |
2927 | branching between the address and the TLS op. */ | |
2928 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
9aa1f1e3 | 2929 | uoffset += dwarf2_per_cu_text_offset (per_cu); |
ac56253d | 2930 | ax_const_l (expr, uoffset); |
3cf03773 | 2931 | break; |
4c2df51b | 2932 | |
3cf03773 TT |
2933 | case DW_OP_const1u: |
2934 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 1, byte_order)); | |
2935 | op_ptr += 1; | |
2936 | break; | |
2937 | case DW_OP_const1s: | |
2938 | ax_const_l (expr, extract_signed_integer (op_ptr, 1, byte_order)); | |
2939 | op_ptr += 1; | |
2940 | break; | |
2941 | case DW_OP_const2u: | |
2942 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 2, byte_order)); | |
2943 | op_ptr += 2; | |
2944 | break; | |
2945 | case DW_OP_const2s: | |
2946 | ax_const_l (expr, extract_signed_integer (op_ptr, 2, byte_order)); | |
2947 | op_ptr += 2; | |
2948 | break; | |
2949 | case DW_OP_const4u: | |
2950 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 4, byte_order)); | |
2951 | op_ptr += 4; | |
2952 | break; | |
2953 | case DW_OP_const4s: | |
2954 | ax_const_l (expr, extract_signed_integer (op_ptr, 4, byte_order)); | |
2955 | op_ptr += 4; | |
2956 | break; | |
2957 | case DW_OP_const8u: | |
2958 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 8, byte_order)); | |
2959 | op_ptr += 8; | |
2960 | break; | |
2961 | case DW_OP_const8s: | |
2962 | ax_const_l (expr, extract_signed_integer (op_ptr, 8, byte_order)); | |
2963 | op_ptr += 8; | |
2964 | break; | |
2965 | case DW_OP_constu: | |
f664829e | 2966 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
3cf03773 TT |
2967 | ax_const_l (expr, uoffset); |
2968 | break; | |
2969 | case DW_OP_consts: | |
f664829e | 2970 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
3cf03773 TT |
2971 | ax_const_l (expr, offset); |
2972 | break; | |
9c238357 | 2973 | |
3cf03773 TT |
2974 | case DW_OP_reg0: |
2975 | case DW_OP_reg1: | |
2976 | case DW_OP_reg2: | |
2977 | case DW_OP_reg3: | |
2978 | case DW_OP_reg4: | |
2979 | case DW_OP_reg5: | |
2980 | case DW_OP_reg6: | |
2981 | case DW_OP_reg7: | |
2982 | case DW_OP_reg8: | |
2983 | case DW_OP_reg9: | |
2984 | case DW_OP_reg10: | |
2985 | case DW_OP_reg11: | |
2986 | case DW_OP_reg12: | |
2987 | case DW_OP_reg13: | |
2988 | case DW_OP_reg14: | |
2989 | case DW_OP_reg15: | |
2990 | case DW_OP_reg16: | |
2991 | case DW_OP_reg17: | |
2992 | case DW_OP_reg18: | |
2993 | case DW_OP_reg19: | |
2994 | case DW_OP_reg20: | |
2995 | case DW_OP_reg21: | |
2996 | case DW_OP_reg22: | |
2997 | case DW_OP_reg23: | |
2998 | case DW_OP_reg24: | |
2999 | case DW_OP_reg25: | |
3000 | case DW_OP_reg26: | |
3001 | case DW_OP_reg27: | |
3002 | case DW_OP_reg28: | |
3003 | case DW_OP_reg29: | |
3004 | case DW_OP_reg30: | |
3005 | case DW_OP_reg31: | |
3006 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
0fde2c53 | 3007 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_reg0); |
3cf03773 TT |
3008 | loc->kind = axs_lvalue_register; |
3009 | break; | |
9c238357 | 3010 | |
3cf03773 | 3011 | case DW_OP_regx: |
f664829e | 3012 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 | 3013 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); |
0fde2c53 | 3014 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3015 | loc->kind = axs_lvalue_register; |
3016 | break; | |
08922a10 | 3017 | |
3cf03773 TT |
3018 | case DW_OP_implicit_value: |
3019 | { | |
9fccedf7 | 3020 | uint64_t len; |
3cf03773 | 3021 | |
f664829e | 3022 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &len); |
3cf03773 TT |
3023 | if (op_ptr + len > op_end) |
3024 | error (_("DW_OP_implicit_value: too few bytes available.")); | |
3025 | if (len > sizeof (ULONGEST)) | |
3026 | error (_("Cannot translate DW_OP_implicit_value of %d bytes"), | |
3027 | (int) len); | |
3028 | ||
3029 | ax_const_l (expr, extract_unsigned_integer (op_ptr, len, | |
3030 | byte_order)); | |
3031 | op_ptr += len; | |
3032 | dwarf_expr_require_composition (op_ptr, op_end, | |
3033 | "DW_OP_implicit_value"); | |
3034 | ||
3035 | loc->kind = axs_rvalue; | |
3036 | } | |
3037 | break; | |
08922a10 | 3038 | |
3cf03773 TT |
3039 | case DW_OP_stack_value: |
3040 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value"); | |
3041 | loc->kind = axs_rvalue; | |
3042 | break; | |
08922a10 | 3043 | |
3cf03773 TT |
3044 | case DW_OP_breg0: |
3045 | case DW_OP_breg1: | |
3046 | case DW_OP_breg2: | |
3047 | case DW_OP_breg3: | |
3048 | case DW_OP_breg4: | |
3049 | case DW_OP_breg5: | |
3050 | case DW_OP_breg6: | |
3051 | case DW_OP_breg7: | |
3052 | case DW_OP_breg8: | |
3053 | case DW_OP_breg9: | |
3054 | case DW_OP_breg10: | |
3055 | case DW_OP_breg11: | |
3056 | case DW_OP_breg12: | |
3057 | case DW_OP_breg13: | |
3058 | case DW_OP_breg14: | |
3059 | case DW_OP_breg15: | |
3060 | case DW_OP_breg16: | |
3061 | case DW_OP_breg17: | |
3062 | case DW_OP_breg18: | |
3063 | case DW_OP_breg19: | |
3064 | case DW_OP_breg20: | |
3065 | case DW_OP_breg21: | |
3066 | case DW_OP_breg22: | |
3067 | case DW_OP_breg23: | |
3068 | case DW_OP_breg24: | |
3069 | case DW_OP_breg25: | |
3070 | case DW_OP_breg26: | |
3071 | case DW_OP_breg27: | |
3072 | case DW_OP_breg28: | |
3073 | case DW_OP_breg29: | |
3074 | case DW_OP_breg30: | |
3075 | case DW_OP_breg31: | |
f664829e | 3076 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
0fde2c53 | 3077 | i = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_breg0); |
3cf03773 TT |
3078 | ax_reg (expr, i); |
3079 | if (offset != 0) | |
3080 | { | |
3081 | ax_const_l (expr, offset); | |
3082 | ax_simple (expr, aop_add); | |
3083 | } | |
3084 | break; | |
3085 | case DW_OP_bregx: | |
3086 | { | |
f664829e DE |
3087 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3088 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
0fde2c53 | 3089 | i = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3090 | ax_reg (expr, i); |
3091 | if (offset != 0) | |
3092 | { | |
3093 | ax_const_l (expr, offset); | |
3094 | ax_simple (expr, aop_add); | |
3095 | } | |
3096 | } | |
3097 | break; | |
3098 | case DW_OP_fbreg: | |
3099 | { | |
3100 | const gdb_byte *datastart; | |
3101 | size_t datalen; | |
3977b71f | 3102 | const struct block *b; |
3cf03773 | 3103 | struct symbol *framefunc; |
08922a10 | 3104 | |
3cf03773 TT |
3105 | b = block_for_pc (expr->scope); |
3106 | ||
3107 | if (!b) | |
3108 | error (_("No block found for address")); | |
3109 | ||
3110 | framefunc = block_linkage_function (b); | |
3111 | ||
3112 | if (!framefunc) | |
3113 | error (_("No function found for block")); | |
3114 | ||
af945b75 TT |
3115 | func_get_frame_base_dwarf_block (framefunc, expr->scope, |
3116 | &datastart, &datalen); | |
3cf03773 | 3117 | |
f664829e | 3118 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
40f4af28 | 3119 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, datastart, |
9f6f94ff | 3120 | datastart + datalen, per_cu); |
d84cf7eb TT |
3121 | if (loc->kind == axs_lvalue_register) |
3122 | require_rvalue (expr, loc); | |
3cf03773 TT |
3123 | |
3124 | if (offset != 0) | |
3125 | { | |
3126 | ax_const_l (expr, offset); | |
3127 | ax_simple (expr, aop_add); | |
3128 | } | |
3129 | ||
3130 | loc->kind = axs_lvalue_memory; | |
3131 | } | |
08922a10 | 3132 | break; |
08922a10 | 3133 | |
3cf03773 TT |
3134 | case DW_OP_dup: |
3135 | ax_simple (expr, aop_dup); | |
3136 | break; | |
08922a10 | 3137 | |
3cf03773 TT |
3138 | case DW_OP_drop: |
3139 | ax_simple (expr, aop_pop); | |
3140 | break; | |
08922a10 | 3141 | |
3cf03773 TT |
3142 | case DW_OP_pick: |
3143 | offset = *op_ptr++; | |
c7f96d2b | 3144 | ax_pick (expr, offset); |
3cf03773 TT |
3145 | break; |
3146 | ||
3147 | case DW_OP_swap: | |
3148 | ax_simple (expr, aop_swap); | |
3149 | break; | |
08922a10 | 3150 | |
3cf03773 | 3151 | case DW_OP_over: |
c7f96d2b | 3152 | ax_pick (expr, 1); |
3cf03773 | 3153 | break; |
08922a10 | 3154 | |
3cf03773 | 3155 | case DW_OP_rot: |
c7f96d2b | 3156 | ax_simple (expr, aop_rot); |
3cf03773 | 3157 | break; |
08922a10 | 3158 | |
3cf03773 TT |
3159 | case DW_OP_deref: |
3160 | case DW_OP_deref_size: | |
3161 | { | |
3162 | int size; | |
08922a10 | 3163 | |
3cf03773 TT |
3164 | if (op == DW_OP_deref_size) |
3165 | size = *op_ptr++; | |
3166 | else | |
3167 | size = addr_size; | |
3168 | ||
9df7235c | 3169 | if (size != 1 && size != 2 && size != 4 && size != 8) |
f3cec7e6 HZ |
3170 | error (_("Unsupported size %d in %s"), |
3171 | size, get_DW_OP_name (op)); | |
9df7235c | 3172 | access_memory (arch, expr, size * TARGET_CHAR_BIT); |
3cf03773 TT |
3173 | } |
3174 | break; | |
3175 | ||
3176 | case DW_OP_abs: | |
3177 | /* Sign extend the operand. */ | |
3178 | ax_ext (expr, addr_size_bits); | |
3179 | ax_simple (expr, aop_dup); | |
3180 | ax_const_l (expr, 0); | |
3181 | ax_simple (expr, aop_less_signed); | |
3182 | ax_simple (expr, aop_log_not); | |
3183 | i = ax_goto (expr, aop_if_goto); | |
3184 | /* We have to emit 0 - X. */ | |
3185 | ax_const_l (expr, 0); | |
3186 | ax_simple (expr, aop_swap); | |
3187 | ax_simple (expr, aop_sub); | |
3188 | ax_label (expr, i, expr->len); | |
3189 | break; | |
3190 | ||
3191 | case DW_OP_neg: | |
3192 | /* No need to sign extend here. */ | |
3193 | ax_const_l (expr, 0); | |
3194 | ax_simple (expr, aop_swap); | |
3195 | ax_simple (expr, aop_sub); | |
3196 | break; | |
3197 | ||
3198 | case DW_OP_not: | |
3199 | /* Sign extend the operand. */ | |
3200 | ax_ext (expr, addr_size_bits); | |
3201 | ax_simple (expr, aop_bit_not); | |
3202 | break; | |
3203 | ||
3204 | case DW_OP_plus_uconst: | |
f664829e | 3205 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 TT |
3206 | /* It would be really weird to emit `DW_OP_plus_uconst 0', |
3207 | but we micro-optimize anyhow. */ | |
3208 | if (reg != 0) | |
3209 | { | |
3210 | ax_const_l (expr, reg); | |
3211 | ax_simple (expr, aop_add); | |
3212 | } | |
3213 | break; | |
3214 | ||
3215 | case DW_OP_and: | |
3216 | ax_simple (expr, aop_bit_and); | |
3217 | break; | |
3218 | ||
3219 | case DW_OP_div: | |
3220 | /* Sign extend the operands. */ | |
3221 | ax_ext (expr, addr_size_bits); | |
3222 | ax_simple (expr, aop_swap); | |
3223 | ax_ext (expr, addr_size_bits); | |
3224 | ax_simple (expr, aop_swap); | |
3225 | ax_simple (expr, aop_div_signed); | |
08922a10 SS |
3226 | break; |
3227 | ||
3cf03773 TT |
3228 | case DW_OP_minus: |
3229 | ax_simple (expr, aop_sub); | |
3230 | break; | |
3231 | ||
3232 | case DW_OP_mod: | |
3233 | ax_simple (expr, aop_rem_unsigned); | |
3234 | break; | |
3235 | ||
3236 | case DW_OP_mul: | |
3237 | ax_simple (expr, aop_mul); | |
3238 | break; | |
3239 | ||
3240 | case DW_OP_or: | |
3241 | ax_simple (expr, aop_bit_or); | |
3242 | break; | |
3243 | ||
3244 | case DW_OP_plus: | |
3245 | ax_simple (expr, aop_add); | |
3246 | break; | |
3247 | ||
3248 | case DW_OP_shl: | |
3249 | ax_simple (expr, aop_lsh); | |
3250 | break; | |
3251 | ||
3252 | case DW_OP_shr: | |
3253 | ax_simple (expr, aop_rsh_unsigned); | |
3254 | break; | |
3255 | ||
3256 | case DW_OP_shra: | |
3257 | ax_simple (expr, aop_rsh_signed); | |
3258 | break; | |
3259 | ||
3260 | case DW_OP_xor: | |
3261 | ax_simple (expr, aop_bit_xor); | |
3262 | break; | |
3263 | ||
3264 | case DW_OP_le: | |
3265 | /* Sign extend the operands. */ | |
3266 | ax_ext (expr, addr_size_bits); | |
3267 | ax_simple (expr, aop_swap); | |
3268 | ax_ext (expr, addr_size_bits); | |
3269 | /* Note no swap here: A <= B is !(B < A). */ | |
3270 | ax_simple (expr, aop_less_signed); | |
3271 | ax_simple (expr, aop_log_not); | |
3272 | break; | |
3273 | ||
3274 | case DW_OP_ge: | |
3275 | /* Sign extend the operands. */ | |
3276 | ax_ext (expr, addr_size_bits); | |
3277 | ax_simple (expr, aop_swap); | |
3278 | ax_ext (expr, addr_size_bits); | |
3279 | ax_simple (expr, aop_swap); | |
3280 | /* A >= B is !(A < B). */ | |
3281 | ax_simple (expr, aop_less_signed); | |
3282 | ax_simple (expr, aop_log_not); | |
3283 | break; | |
3284 | ||
3285 | case DW_OP_eq: | |
3286 | /* Sign extend the operands. */ | |
3287 | ax_ext (expr, addr_size_bits); | |
3288 | ax_simple (expr, aop_swap); | |
3289 | ax_ext (expr, addr_size_bits); | |
3290 | /* No need for a second swap here. */ | |
3291 | ax_simple (expr, aop_equal); | |
3292 | break; | |
3293 | ||
3294 | case DW_OP_lt: | |
3295 | /* Sign extend the operands. */ | |
3296 | ax_ext (expr, addr_size_bits); | |
3297 | ax_simple (expr, aop_swap); | |
3298 | ax_ext (expr, addr_size_bits); | |
3299 | ax_simple (expr, aop_swap); | |
3300 | ax_simple (expr, aop_less_signed); | |
3301 | break; | |
3302 | ||
3303 | case DW_OP_gt: | |
3304 | /* Sign extend the operands. */ | |
3305 | ax_ext (expr, addr_size_bits); | |
3306 | ax_simple (expr, aop_swap); | |
3307 | ax_ext (expr, addr_size_bits); | |
3308 | /* Note no swap here: A > B is B < A. */ | |
3309 | ax_simple (expr, aop_less_signed); | |
3310 | break; | |
3311 | ||
3312 | case DW_OP_ne: | |
3313 | /* Sign extend the operands. */ | |
3314 | ax_ext (expr, addr_size_bits); | |
3315 | ax_simple (expr, aop_swap); | |
3316 | ax_ext (expr, addr_size_bits); | |
3317 | /* No need for a swap here. */ | |
3318 | ax_simple (expr, aop_equal); | |
3319 | ax_simple (expr, aop_log_not); | |
3320 | break; | |
3321 | ||
3322 | case DW_OP_call_frame_cfa: | |
a8fd5589 TT |
3323 | { |
3324 | int regnum; | |
3325 | CORE_ADDR text_offset; | |
3326 | LONGEST off; | |
3327 | const gdb_byte *cfa_start, *cfa_end; | |
3328 | ||
3329 | if (dwarf2_fetch_cfa_info (arch, expr->scope, per_cu, | |
3330 | ®num, &off, | |
3331 | &text_offset, &cfa_start, &cfa_end)) | |
3332 | { | |
3333 | /* Register. */ | |
3334 | ax_reg (expr, regnum); | |
3335 | if (off != 0) | |
3336 | { | |
3337 | ax_const_l (expr, off); | |
3338 | ax_simple (expr, aop_add); | |
3339 | } | |
3340 | } | |
3341 | else | |
3342 | { | |
3343 | /* Another expression. */ | |
3344 | ax_const_l (expr, text_offset); | |
40f4af28 SM |
3345 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, cfa_start, |
3346 | cfa_end, per_cu); | |
a8fd5589 TT |
3347 | } |
3348 | ||
3349 | loc->kind = axs_lvalue_memory; | |
3350 | } | |
3cf03773 TT |
3351 | break; |
3352 | ||
3353 | case DW_OP_GNU_push_tls_address: | |
4aa4e28b | 3354 | case DW_OP_form_tls_address: |
3cf03773 TT |
3355 | unimplemented (op); |
3356 | break; | |
3357 | ||
08412b07 JB |
3358 | case DW_OP_push_object_address: |
3359 | unimplemented (op); | |
3360 | break; | |
3361 | ||
3cf03773 TT |
3362 | case DW_OP_skip: |
3363 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3364 | op_ptr += 2; | |
3365 | i = ax_goto (expr, aop_goto); | |
58414334 TT |
3366 | dw_labels.push_back (op_ptr + offset - base); |
3367 | patches.push_back (i); | |
3cf03773 TT |
3368 | break; |
3369 | ||
3370 | case DW_OP_bra: | |
3371 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3372 | op_ptr += 2; | |
3373 | /* Zero extend the operand. */ | |
3374 | ax_zero_ext (expr, addr_size_bits); | |
3375 | i = ax_goto (expr, aop_if_goto); | |
58414334 TT |
3376 | dw_labels.push_back (op_ptr + offset - base); |
3377 | patches.push_back (i); | |
3cf03773 TT |
3378 | break; |
3379 | ||
3380 | case DW_OP_nop: | |
3381 | break; | |
3382 | ||
3383 | case DW_OP_piece: | |
3384 | case DW_OP_bit_piece: | |
08922a10 | 3385 | { |
b926417a | 3386 | uint64_t size; |
3cf03773 TT |
3387 | |
3388 | if (op_ptr - 1 == previous_piece) | |
3389 | error (_("Cannot translate empty pieces to agent expressions")); | |
3390 | previous_piece = op_ptr - 1; | |
3391 | ||
f664829e | 3392 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &size); |
3cf03773 TT |
3393 | if (op == DW_OP_piece) |
3394 | { | |
3395 | size *= 8; | |
b926417a | 3396 | uoffset = 0; |
3cf03773 TT |
3397 | } |
3398 | else | |
b926417a | 3399 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
08922a10 | 3400 | |
3cf03773 TT |
3401 | if (bits_collected + size > 8 * sizeof (LONGEST)) |
3402 | error (_("Expression pieces exceed word size")); | |
3403 | ||
3404 | /* Access the bits. */ | |
3405 | switch (loc->kind) | |
3406 | { | |
3407 | case axs_lvalue_register: | |
3408 | ax_reg (expr, loc->u.reg); | |
3409 | break; | |
3410 | ||
3411 | case axs_lvalue_memory: | |
3412 | /* Offset the pointer, if needed. */ | |
b926417a | 3413 | if (uoffset > 8) |
3cf03773 | 3414 | { |
b926417a | 3415 | ax_const_l (expr, uoffset / 8); |
3cf03773 | 3416 | ax_simple (expr, aop_add); |
b926417a | 3417 | uoffset %= 8; |
3cf03773 TT |
3418 | } |
3419 | access_memory (arch, expr, size); | |
3420 | break; | |
3421 | } | |
3422 | ||
3423 | /* For a bits-big-endian target, shift up what we already | |
3424 | have. For a bits-little-endian target, shift up the | |
3425 | new data. Note that there is a potential bug here if | |
3426 | the DWARF expression leaves multiple values on the | |
3427 | stack. */ | |
3428 | if (bits_collected > 0) | |
3429 | { | |
3430 | if (bits_big_endian) | |
3431 | { | |
3432 | ax_simple (expr, aop_swap); | |
3433 | ax_const_l (expr, size); | |
3434 | ax_simple (expr, aop_lsh); | |
3435 | /* We don't need a second swap here, because | |
3436 | aop_bit_or is symmetric. */ | |
3437 | } | |
3438 | else | |
3439 | { | |
3440 | ax_const_l (expr, size); | |
3441 | ax_simple (expr, aop_lsh); | |
3442 | } | |
3443 | ax_simple (expr, aop_bit_or); | |
3444 | } | |
3445 | ||
3446 | bits_collected += size; | |
3447 | loc->kind = axs_rvalue; | |
08922a10 SS |
3448 | } |
3449 | break; | |
08922a10 | 3450 | |
3cf03773 TT |
3451 | case DW_OP_GNU_uninit: |
3452 | unimplemented (op); | |
3453 | ||
3454 | case DW_OP_call2: | |
3455 | case DW_OP_call4: | |
3456 | { | |
3457 | struct dwarf2_locexpr_baton block; | |
3458 | int size = (op == DW_OP_call2 ? 2 : 4); | |
3459 | ||
3460 | uoffset = extract_unsigned_integer (op_ptr, size, byte_order); | |
3461 | op_ptr += size; | |
3462 | ||
b926417a TT |
3463 | cu_offset cuoffset = (cu_offset) uoffset; |
3464 | block = dwarf2_fetch_die_loc_cu_off (cuoffset, per_cu, | |
8b9737bf | 3465 | get_ax_pc, expr); |
3cf03773 TT |
3466 | |
3467 | /* DW_OP_call_ref is currently not supported. */ | |
3468 | gdb_assert (block.per_cu == per_cu); | |
3469 | ||
40f4af28 SM |
3470 | dwarf2_compile_expr_to_ax (expr, loc, addr_size, block.data, |
3471 | block.data + block.size, per_cu); | |
3cf03773 TT |
3472 | } |
3473 | break; | |
3474 | ||
3475 | case DW_OP_call_ref: | |
3476 | unimplemented (op); | |
3477 | ||
a6b786da KB |
3478 | case DW_OP_GNU_variable_value: |
3479 | unimplemented (op); | |
3480 | ||
3cf03773 | 3481 | default: |
b1bfef65 | 3482 | unimplemented (op); |
08922a10 | 3483 | } |
08922a10 | 3484 | } |
3cf03773 TT |
3485 | |
3486 | /* Patch all the branches we emitted. */ | |
b926417a | 3487 | for (int i = 0; i < patches.size (); ++i) |
3cf03773 | 3488 | { |
58414334 | 3489 | int targ = offsets[dw_labels[i]]; |
3cf03773 TT |
3490 | if (targ == -1) |
3491 | internal_error (__FILE__, __LINE__, _("invalid label")); | |
58414334 | 3492 | ax_label (expr, patches[i], targ); |
3cf03773 | 3493 | } |
08922a10 SS |
3494 | } |
3495 | ||
4c2df51b DJ |
3496 | \f |
3497 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
3498 | evaluator to calculate the location. */ | |
3499 | static struct value * | |
3500 | locexpr_read_variable (struct symbol *symbol, struct frame_info *frame) | |
3501 | { | |
9a3c8263 SM |
3502 | struct dwarf2_locexpr_baton *dlbaton |
3503 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
4c2df51b | 3504 | struct value *val; |
9a619af0 | 3505 | |
a2d33775 JK |
3506 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data, |
3507 | dlbaton->size, dlbaton->per_cu); | |
4c2df51b DJ |
3508 | |
3509 | return val; | |
3510 | } | |
3511 | ||
e18b2753 JK |
3512 | /* Return the value of SYMBOL in FRAME at (callee) FRAME's function |
3513 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
3514 | will be thrown. */ | |
3515 | ||
3516 | static struct value * | |
3517 | locexpr_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
3518 | { | |
9a3c8263 SM |
3519 | struct dwarf2_locexpr_baton *dlbaton |
3520 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
3521 | |
3522 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, dlbaton->data, | |
3523 | dlbaton->size); | |
3524 | } | |
3525 | ||
0b31a4bc TT |
3526 | /* Implementation of get_symbol_read_needs from |
3527 | symbol_computed_ops. */ | |
3528 | ||
3529 | static enum symbol_needs_kind | |
3530 | locexpr_get_symbol_read_needs (struct symbol *symbol) | |
4c2df51b | 3531 | { |
9a3c8263 SM |
3532 | struct dwarf2_locexpr_baton *dlbaton |
3533 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
9a619af0 | 3534 | |
0b31a4bc TT |
3535 | return dwarf2_loc_desc_get_symbol_read_needs (dlbaton->data, dlbaton->size, |
3536 | dlbaton->per_cu); | |
4c2df51b DJ |
3537 | } |
3538 | ||
9eae7c52 TT |
3539 | /* Return true if DATA points to the end of a piece. END is one past |
3540 | the last byte in the expression. */ | |
3541 | ||
3542 | static int | |
3543 | piece_end_p (const gdb_byte *data, const gdb_byte *end) | |
3544 | { | |
3545 | return data == end || data[0] == DW_OP_piece || data[0] == DW_OP_bit_piece; | |
3546 | } | |
3547 | ||
5e44ecb3 TT |
3548 | /* Helper for locexpr_describe_location_piece that finds the name of a |
3549 | DWARF register. */ | |
3550 | ||
3551 | static const char * | |
3552 | locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum) | |
3553 | { | |
3554 | int regnum; | |
3555 | ||
0fde2c53 DE |
3556 | /* This doesn't use dwarf_reg_to_regnum_or_error on purpose. |
3557 | We'd rather print *something* here than throw an error. */ | |
3558 | regnum = dwarf_reg_to_regnum (gdbarch, dwarf_regnum); | |
3559 | /* gdbarch_register_name may just return "", return something more | |
3560 | descriptive for bad register numbers. */ | |
3561 | if (regnum == -1) | |
3562 | { | |
3563 | /* The text is output as "$bad_register_number". | |
3564 | That is why we use the underscores. */ | |
3565 | return _("bad_register_number"); | |
3566 | } | |
5e44ecb3 TT |
3567 | return gdbarch_register_name (gdbarch, regnum); |
3568 | } | |
3569 | ||
9eae7c52 TT |
3570 | /* Nicely describe a single piece of a location, returning an updated |
3571 | position in the bytecode sequence. This function cannot recognize | |
3572 | all locations; if a location is not recognized, it simply returns | |
f664829e DE |
3573 | DATA. If there is an error during reading, e.g. we run off the end |
3574 | of the buffer, an error is thrown. */ | |
08922a10 | 3575 | |
0d45f56e | 3576 | static const gdb_byte * |
08922a10 SS |
3577 | locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream, |
3578 | CORE_ADDR addr, struct objfile *objfile, | |
49f6c839 | 3579 | struct dwarf2_per_cu_data *per_cu, |
9eae7c52 | 3580 | const gdb_byte *data, const gdb_byte *end, |
0d45f56e | 3581 | unsigned int addr_size) |
4c2df51b | 3582 | { |
08922a10 | 3583 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
49f6c839 | 3584 | size_t leb128_size; |
08922a10 SS |
3585 | |
3586 | if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31) | |
3587 | { | |
08922a10 | 3588 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3589 | locexpr_regname (gdbarch, data[0] - DW_OP_reg0)); |
08922a10 SS |
3590 | data += 1; |
3591 | } | |
3592 | else if (data[0] == DW_OP_regx) | |
3593 | { | |
9fccedf7 | 3594 | uint64_t reg; |
4c2df51b | 3595 | |
f664829e | 3596 | data = safe_read_uleb128 (data + 1, end, ®); |
08922a10 | 3597 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3598 | locexpr_regname (gdbarch, reg)); |
08922a10 SS |
3599 | } |
3600 | else if (data[0] == DW_OP_fbreg) | |
4c2df51b | 3601 | { |
3977b71f | 3602 | const struct block *b; |
08922a10 SS |
3603 | struct symbol *framefunc; |
3604 | int frame_reg = 0; | |
9fccedf7 | 3605 | int64_t frame_offset; |
7155d578 | 3606 | const gdb_byte *base_data, *new_data, *save_data = data; |
08922a10 | 3607 | size_t base_size; |
9fccedf7 | 3608 | int64_t base_offset = 0; |
08922a10 | 3609 | |
f664829e | 3610 | new_data = safe_read_sleb128 (data + 1, end, &frame_offset); |
9eae7c52 TT |
3611 | if (!piece_end_p (new_data, end)) |
3612 | return data; | |
3613 | data = new_data; | |
3614 | ||
08922a10 SS |
3615 | b = block_for_pc (addr); |
3616 | ||
3617 | if (!b) | |
3618 | error (_("No block found for address for symbol \"%s\"."), | |
3619 | SYMBOL_PRINT_NAME (symbol)); | |
3620 | ||
3621 | framefunc = block_linkage_function (b); | |
3622 | ||
3623 | if (!framefunc) | |
3624 | error (_("No function found for block for symbol \"%s\"."), | |
3625 | SYMBOL_PRINT_NAME (symbol)); | |
3626 | ||
af945b75 | 3627 | func_get_frame_base_dwarf_block (framefunc, addr, &base_data, &base_size); |
08922a10 SS |
3628 | |
3629 | if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31) | |
3630 | { | |
0d45f56e | 3631 | const gdb_byte *buf_end; |
08922a10 SS |
3632 | |
3633 | frame_reg = base_data[0] - DW_OP_breg0; | |
f664829e DE |
3634 | buf_end = safe_read_sleb128 (base_data + 1, base_data + base_size, |
3635 | &base_offset); | |
08922a10 | 3636 | if (buf_end != base_data + base_size) |
3e43a32a MS |
3637 | error (_("Unexpected opcode after " |
3638 | "DW_OP_breg%u for symbol \"%s\"."), | |
08922a10 SS |
3639 | frame_reg, SYMBOL_PRINT_NAME (symbol)); |
3640 | } | |
3641 | else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31) | |
3642 | { | |
3643 | /* The frame base is just the register, with no offset. */ | |
3644 | frame_reg = base_data[0] - DW_OP_reg0; | |
3645 | base_offset = 0; | |
3646 | } | |
3647 | else | |
3648 | { | |
3649 | /* We don't know what to do with the frame base expression, | |
3650 | so we can't trace this variable; give up. */ | |
7155d578 | 3651 | return save_data; |
08922a10 SS |
3652 | } |
3653 | ||
3e43a32a MS |
3654 | fprintf_filtered (stream, |
3655 | _("a variable at frame base reg $%s offset %s+%s"), | |
5e44ecb3 | 3656 | locexpr_regname (gdbarch, frame_reg), |
08922a10 SS |
3657 | plongest (base_offset), plongest (frame_offset)); |
3658 | } | |
9eae7c52 TT |
3659 | else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31 |
3660 | && piece_end_p (data, end)) | |
08922a10 | 3661 | { |
9fccedf7 | 3662 | int64_t offset; |
08922a10 | 3663 | |
f664829e | 3664 | data = safe_read_sleb128 (data + 1, end, &offset); |
08922a10 | 3665 | |
4c2df51b | 3666 | fprintf_filtered (stream, |
08922a10 SS |
3667 | _("a variable at offset %s from base reg $%s"), |
3668 | plongest (offset), | |
5e44ecb3 | 3669 | locexpr_regname (gdbarch, data[0] - DW_OP_breg0)); |
4c2df51b DJ |
3670 | } |
3671 | ||
c3228f12 EZ |
3672 | /* The location expression for a TLS variable looks like this (on a |
3673 | 64-bit LE machine): | |
3674 | ||
3675 | DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0 | |
3676 | (DW_OP_addr: 4; DW_OP_GNU_push_tls_address) | |
09d8bd00 | 3677 | |
c3228f12 EZ |
3678 | 0x3 is the encoding for DW_OP_addr, which has an operand as long |
3679 | as the size of an address on the target machine (here is 8 | |
09d8bd00 TT |
3680 | bytes). Note that more recent version of GCC emit DW_OP_const4u |
3681 | or DW_OP_const8u, depending on address size, rather than | |
0963b4bd MS |
3682 | DW_OP_addr. 0xe0 is the encoding for DW_OP_GNU_push_tls_address. |
3683 | The operand represents the offset at which the variable is within | |
3684 | the thread local storage. */ | |
c3228f12 | 3685 | |
9eae7c52 | 3686 | else if (data + 1 + addr_size < end |
09d8bd00 TT |
3687 | && (data[0] == DW_OP_addr |
3688 | || (addr_size == 4 && data[0] == DW_OP_const4u) | |
3689 | || (addr_size == 8 && data[0] == DW_OP_const8u)) | |
4aa4e28b TT |
3690 | && (data[1 + addr_size] == DW_OP_GNU_push_tls_address |
3691 | || data[1 + addr_size] == DW_OP_form_tls_address) | |
9eae7c52 | 3692 | && piece_end_p (data + 2 + addr_size, end)) |
08922a10 | 3693 | { |
d4a087c7 UW |
3694 | ULONGEST offset; |
3695 | offset = extract_unsigned_integer (data + 1, addr_size, | |
3696 | gdbarch_byte_order (gdbarch)); | |
9a619af0 | 3697 | |
08922a10 | 3698 | fprintf_filtered (stream, |
d4a087c7 | 3699 | _("a thread-local variable at offset 0x%s " |
08922a10 | 3700 | "in the thread-local storage for `%s'"), |
4262abfb | 3701 | phex_nz (offset, addr_size), objfile_name (objfile)); |
08922a10 SS |
3702 | |
3703 | data += 1 + addr_size + 1; | |
3704 | } | |
49f6c839 DE |
3705 | |
3706 | /* With -gsplit-dwarf a TLS variable can also look like this: | |
3707 | DW_AT_location : 3 byte block: fc 4 e0 | |
3708 | (DW_OP_GNU_const_index: 4; | |
3709 | DW_OP_GNU_push_tls_address) */ | |
3710 | else if (data + 3 <= end | |
3711 | && data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end | |
3712 | && data[0] == DW_OP_GNU_const_index | |
3713 | && leb128_size > 0 | |
4aa4e28b TT |
3714 | && (data[1 + leb128_size] == DW_OP_GNU_push_tls_address |
3715 | || data[1 + leb128_size] == DW_OP_form_tls_address) | |
49f6c839 DE |
3716 | && piece_end_p (data + 2 + leb128_size, end)) |
3717 | { | |
a55c1f32 | 3718 | uint64_t offset; |
49f6c839 DE |
3719 | |
3720 | data = safe_read_uleb128 (data + 1, end, &offset); | |
3721 | offset = dwarf2_read_addr_index (per_cu, offset); | |
3722 | fprintf_filtered (stream, | |
3723 | _("a thread-local variable at offset 0x%s " | |
3724 | "in the thread-local storage for `%s'"), | |
4262abfb | 3725 | phex_nz (offset, addr_size), objfile_name (objfile)); |
49f6c839 DE |
3726 | ++data; |
3727 | } | |
3728 | ||
9eae7c52 TT |
3729 | else if (data[0] >= DW_OP_lit0 |
3730 | && data[0] <= DW_OP_lit31 | |
3731 | && data + 1 < end | |
3732 | && data[1] == DW_OP_stack_value) | |
3733 | { | |
3734 | fprintf_filtered (stream, _("the constant %d"), data[0] - DW_OP_lit0); | |
3735 | data += 2; | |
3736 | } | |
3737 | ||
3738 | return data; | |
3739 | } | |
3740 | ||
3741 | /* Disassemble an expression, stopping at the end of a piece or at the | |
3742 | end of the expression. Returns a pointer to the next unread byte | |
3743 | in the input expression. If ALL is nonzero, then this function | |
f664829e DE |
3744 | will keep going until it reaches the end of the expression. |
3745 | If there is an error during reading, e.g. we run off the end | |
3746 | of the buffer, an error is thrown. */ | |
9eae7c52 TT |
3747 | |
3748 | static const gdb_byte * | |
3749 | disassemble_dwarf_expression (struct ui_file *stream, | |
3750 | struct gdbarch *arch, unsigned int addr_size, | |
2bda9cc5 | 3751 | int offset_size, const gdb_byte *start, |
9eae7c52 | 3752 | const gdb_byte *data, const gdb_byte *end, |
2bda9cc5 | 3753 | int indent, int all, |
5e44ecb3 | 3754 | struct dwarf2_per_cu_data *per_cu) |
9eae7c52 | 3755 | { |
9eae7c52 TT |
3756 | while (data < end |
3757 | && (all | |
3758 | || (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece))) | |
3759 | { | |
aead7601 | 3760 | enum dwarf_location_atom op = (enum dwarf_location_atom) *data++; |
9fccedf7 DE |
3761 | uint64_t ul; |
3762 | int64_t l; | |
9eae7c52 TT |
3763 | const char *name; |
3764 | ||
f39c6ffd | 3765 | name = get_DW_OP_name (op); |
9eae7c52 TT |
3766 | |
3767 | if (!name) | |
3768 | error (_("Unrecognized DWARF opcode 0x%02x at %ld"), | |
06826322 | 3769 | op, (long) (data - 1 - start)); |
2bda9cc5 JK |
3770 | fprintf_filtered (stream, " %*ld: %s", indent + 4, |
3771 | (long) (data - 1 - start), name); | |
9eae7c52 TT |
3772 | |
3773 | switch (op) | |
3774 | { | |
3775 | case DW_OP_addr: | |
d4a087c7 UW |
3776 | ul = extract_unsigned_integer (data, addr_size, |
3777 | gdbarch_byte_order (arch)); | |
9eae7c52 | 3778 | data += addr_size; |
d4a087c7 | 3779 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); |
9eae7c52 TT |
3780 | break; |
3781 | ||
3782 | case DW_OP_const1u: | |
3783 | ul = extract_unsigned_integer (data, 1, gdbarch_byte_order (arch)); | |
3784 | data += 1; | |
3785 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3786 | break; | |
3787 | case DW_OP_const1s: | |
3788 | l = extract_signed_integer (data, 1, gdbarch_byte_order (arch)); | |
3789 | data += 1; | |
3790 | fprintf_filtered (stream, " %s", plongest (l)); | |
3791 | break; | |
3792 | case DW_OP_const2u: | |
3793 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3794 | data += 2; | |
3795 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3796 | break; | |
3797 | case DW_OP_const2s: | |
3798 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3799 | data += 2; | |
3800 | fprintf_filtered (stream, " %s", plongest (l)); | |
3801 | break; | |
3802 | case DW_OP_const4u: | |
3803 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3804 | data += 4; | |
3805 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3806 | break; | |
3807 | case DW_OP_const4s: | |
3808 | l = extract_signed_integer (data, 4, gdbarch_byte_order (arch)); | |
3809 | data += 4; | |
3810 | fprintf_filtered (stream, " %s", plongest (l)); | |
3811 | break; | |
3812 | case DW_OP_const8u: | |
3813 | ul = extract_unsigned_integer (data, 8, gdbarch_byte_order (arch)); | |
3814 | data += 8; | |
3815 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3816 | break; | |
3817 | case DW_OP_const8s: | |
3818 | l = extract_signed_integer (data, 8, gdbarch_byte_order (arch)); | |
3819 | data += 8; | |
3820 | fprintf_filtered (stream, " %s", plongest (l)); | |
3821 | break; | |
3822 | case DW_OP_constu: | |
f664829e | 3823 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3824 | fprintf_filtered (stream, " %s", pulongest (ul)); |
3825 | break; | |
3826 | case DW_OP_consts: | |
f664829e | 3827 | data = safe_read_sleb128 (data, end, &l); |
9eae7c52 TT |
3828 | fprintf_filtered (stream, " %s", plongest (l)); |
3829 | break; | |
3830 | ||
3831 | case DW_OP_reg0: | |
3832 | case DW_OP_reg1: | |
3833 | case DW_OP_reg2: | |
3834 | case DW_OP_reg3: | |
3835 | case DW_OP_reg4: | |
3836 | case DW_OP_reg5: | |
3837 | case DW_OP_reg6: | |
3838 | case DW_OP_reg7: | |
3839 | case DW_OP_reg8: | |
3840 | case DW_OP_reg9: | |
3841 | case DW_OP_reg10: | |
3842 | case DW_OP_reg11: | |
3843 | case DW_OP_reg12: | |
3844 | case DW_OP_reg13: | |
3845 | case DW_OP_reg14: | |
3846 | case DW_OP_reg15: | |
3847 | case DW_OP_reg16: | |
3848 | case DW_OP_reg17: | |
3849 | case DW_OP_reg18: | |
3850 | case DW_OP_reg19: | |
3851 | case DW_OP_reg20: | |
3852 | case DW_OP_reg21: | |
3853 | case DW_OP_reg22: | |
3854 | case DW_OP_reg23: | |
3855 | case DW_OP_reg24: | |
3856 | case DW_OP_reg25: | |
3857 | case DW_OP_reg26: | |
3858 | case DW_OP_reg27: | |
3859 | case DW_OP_reg28: | |
3860 | case DW_OP_reg29: | |
3861 | case DW_OP_reg30: | |
3862 | case DW_OP_reg31: | |
3863 | fprintf_filtered (stream, " [$%s]", | |
5e44ecb3 | 3864 | locexpr_regname (arch, op - DW_OP_reg0)); |
9eae7c52 TT |
3865 | break; |
3866 | ||
3867 | case DW_OP_regx: | |
f664829e | 3868 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 | 3869 | fprintf_filtered (stream, " %s [$%s]", pulongest (ul), |
5e44ecb3 | 3870 | locexpr_regname (arch, (int) ul)); |
9eae7c52 TT |
3871 | break; |
3872 | ||
3873 | case DW_OP_implicit_value: | |
f664829e | 3874 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3875 | data += ul; |
3876 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3877 | break; | |
3878 | ||
3879 | case DW_OP_breg0: | |
3880 | case DW_OP_breg1: | |
3881 | case DW_OP_breg2: | |
3882 | case DW_OP_breg3: | |
3883 | case DW_OP_breg4: | |
3884 | case DW_OP_breg5: | |
3885 | case DW_OP_breg6: | |
3886 | case DW_OP_breg7: | |
3887 | case DW_OP_breg8: | |
3888 | case DW_OP_breg9: | |
3889 | case DW_OP_breg10: | |
3890 | case DW_OP_breg11: | |
3891 | case DW_OP_breg12: | |
3892 | case DW_OP_breg13: | |
3893 | case DW_OP_breg14: | |
3894 | case DW_OP_breg15: | |
3895 | case DW_OP_breg16: | |
3896 | case DW_OP_breg17: | |
3897 | case DW_OP_breg18: | |
3898 | case DW_OP_breg19: | |
3899 | case DW_OP_breg20: | |
3900 | case DW_OP_breg21: | |
3901 | case DW_OP_breg22: | |
3902 | case DW_OP_breg23: | |
3903 | case DW_OP_breg24: | |
3904 | case DW_OP_breg25: | |
3905 | case DW_OP_breg26: | |
3906 | case DW_OP_breg27: | |
3907 | case DW_OP_breg28: | |
3908 | case DW_OP_breg29: | |
3909 | case DW_OP_breg30: | |
3910 | case DW_OP_breg31: | |
f664829e | 3911 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 3912 | fprintf_filtered (stream, " %s [$%s]", plongest (l), |
5e44ecb3 | 3913 | locexpr_regname (arch, op - DW_OP_breg0)); |
9eae7c52 TT |
3914 | break; |
3915 | ||
3916 | case DW_OP_bregx: | |
f664829e DE |
3917 | data = safe_read_uleb128 (data, end, &ul); |
3918 | data = safe_read_sleb128 (data, end, &l); | |
0502ed8c JK |
3919 | fprintf_filtered (stream, " register %s [$%s] offset %s", |
3920 | pulongest (ul), | |
5e44ecb3 | 3921 | locexpr_regname (arch, (int) ul), |
0502ed8c | 3922 | plongest (l)); |
9eae7c52 TT |
3923 | break; |
3924 | ||
3925 | case DW_OP_fbreg: | |
f664829e | 3926 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 3927 | fprintf_filtered (stream, " %s", plongest (l)); |
9eae7c52 TT |
3928 | break; |
3929 | ||
3930 | case DW_OP_xderef_size: | |
3931 | case DW_OP_deref_size: | |
3932 | case DW_OP_pick: | |
3933 | fprintf_filtered (stream, " %d", *data); | |
3934 | ++data; | |
3935 | break; | |
3936 | ||
3937 | case DW_OP_plus_uconst: | |
f664829e | 3938 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3939 | fprintf_filtered (stream, " %s", pulongest (ul)); |
3940 | break; | |
3941 | ||
3942 | case DW_OP_skip: | |
3943 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3944 | data += 2; | |
3945 | fprintf_filtered (stream, " to %ld", | |
3946 | (long) (data + l - start)); | |
3947 | break; | |
3948 | ||
3949 | case DW_OP_bra: | |
3950 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3951 | data += 2; | |
3952 | fprintf_filtered (stream, " %ld", | |
3953 | (long) (data + l - start)); | |
3954 | break; | |
3955 | ||
3956 | case DW_OP_call2: | |
3957 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3958 | data += 2; | |
3959 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 2)); | |
3960 | break; | |
3961 | ||
3962 | case DW_OP_call4: | |
3963 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3964 | data += 4; | |
3965 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
3966 | break; | |
3967 | ||
3968 | case DW_OP_call_ref: | |
3969 | ul = extract_unsigned_integer (data, offset_size, | |
3970 | gdbarch_byte_order (arch)); | |
3971 | data += offset_size; | |
3972 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
3973 | break; | |
3974 | ||
3975 | case DW_OP_piece: | |
f664829e | 3976 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
3977 | fprintf_filtered (stream, " %s (bytes)", pulongest (ul)); |
3978 | break; | |
3979 | ||
3980 | case DW_OP_bit_piece: | |
3981 | { | |
9fccedf7 | 3982 | uint64_t offset; |
9eae7c52 | 3983 | |
f664829e DE |
3984 | data = safe_read_uleb128 (data, end, &ul); |
3985 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
3986 | fprintf_filtered (stream, " size %s offset %s (bits)", |
3987 | pulongest (ul), pulongest (offset)); | |
3988 | } | |
3989 | break; | |
8cf6f0b1 | 3990 | |
216f72a1 | 3991 | case DW_OP_implicit_pointer: |
8cf6f0b1 TT |
3992 | case DW_OP_GNU_implicit_pointer: |
3993 | { | |
3994 | ul = extract_unsigned_integer (data, offset_size, | |
3995 | gdbarch_byte_order (arch)); | |
3996 | data += offset_size; | |
3997 | ||
f664829e | 3998 | data = safe_read_sleb128 (data, end, &l); |
8cf6f0b1 TT |
3999 | |
4000 | fprintf_filtered (stream, " DIE %s offset %s", | |
4001 | phex_nz (ul, offset_size), | |
4002 | plongest (l)); | |
4003 | } | |
4004 | break; | |
5e44ecb3 | 4005 | |
216f72a1 | 4006 | case DW_OP_deref_type: |
5e44ecb3 TT |
4007 | case DW_OP_GNU_deref_type: |
4008 | { | |
b926417a | 4009 | int deref_addr_size = *data++; |
5e44ecb3 TT |
4010 | struct type *type; |
4011 | ||
f664829e | 4012 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4013 | cu_offset offset = (cu_offset) ul; |
5e44ecb3 TT |
4014 | type = dwarf2_get_die_type (offset, per_cu); |
4015 | fprintf_filtered (stream, "<"); | |
4016 | type_print (type, "", stream, -1); | |
9c541725 PA |
4017 | fprintf_filtered (stream, " [0x%s]> %d", |
4018 | phex_nz (to_underlying (offset), 0), | |
b926417a | 4019 | deref_addr_size); |
5e44ecb3 TT |
4020 | } |
4021 | break; | |
4022 | ||
216f72a1 | 4023 | case DW_OP_const_type: |
5e44ecb3 TT |
4024 | case DW_OP_GNU_const_type: |
4025 | { | |
5e44ecb3 TT |
4026 | struct type *type; |
4027 | ||
f664829e | 4028 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4029 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 TT |
4030 | type = dwarf2_get_die_type (type_die, per_cu); |
4031 | fprintf_filtered (stream, "<"); | |
4032 | type_print (type, "", stream, -1); | |
9c541725 PA |
4033 | fprintf_filtered (stream, " [0x%s]>", |
4034 | phex_nz (to_underlying (type_die), 0)); | |
5e44ecb3 TT |
4035 | } |
4036 | break; | |
4037 | ||
216f72a1 | 4038 | case DW_OP_regval_type: |
5e44ecb3 TT |
4039 | case DW_OP_GNU_regval_type: |
4040 | { | |
9fccedf7 | 4041 | uint64_t reg; |
5e44ecb3 TT |
4042 | struct type *type; |
4043 | ||
f664829e DE |
4044 | data = safe_read_uleb128 (data, end, ®); |
4045 | data = safe_read_uleb128 (data, end, &ul); | |
9c541725 | 4046 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 TT |
4047 | |
4048 | type = dwarf2_get_die_type (type_die, per_cu); | |
4049 | fprintf_filtered (stream, "<"); | |
4050 | type_print (type, "", stream, -1); | |
b64f50a1 | 4051 | fprintf_filtered (stream, " [0x%s]> [$%s]", |
9c541725 | 4052 | phex_nz (to_underlying (type_die), 0), |
5e44ecb3 TT |
4053 | locexpr_regname (arch, reg)); |
4054 | } | |
4055 | break; | |
4056 | ||
216f72a1 | 4057 | case DW_OP_convert: |
5e44ecb3 | 4058 | case DW_OP_GNU_convert: |
216f72a1 | 4059 | case DW_OP_reinterpret: |
5e44ecb3 TT |
4060 | case DW_OP_GNU_reinterpret: |
4061 | { | |
f664829e | 4062 | data = safe_read_uleb128 (data, end, &ul); |
9c541725 | 4063 | cu_offset type_die = (cu_offset) ul; |
5e44ecb3 | 4064 | |
9c541725 | 4065 | if (to_underlying (type_die) == 0) |
5e44ecb3 TT |
4066 | fprintf_filtered (stream, "<0>"); |
4067 | else | |
4068 | { | |
4069 | struct type *type; | |
4070 | ||
4071 | type = dwarf2_get_die_type (type_die, per_cu); | |
4072 | fprintf_filtered (stream, "<"); | |
4073 | type_print (type, "", stream, -1); | |
9c541725 PA |
4074 | fprintf_filtered (stream, " [0x%s]>", |
4075 | phex_nz (to_underlying (type_die), 0)); | |
5e44ecb3 TT |
4076 | } |
4077 | } | |
4078 | break; | |
2bda9cc5 | 4079 | |
216f72a1 | 4080 | case DW_OP_entry_value: |
2bda9cc5 | 4081 | case DW_OP_GNU_entry_value: |
f664829e | 4082 | data = safe_read_uleb128 (data, end, &ul); |
2bda9cc5 JK |
4083 | fputc_filtered ('\n', stream); |
4084 | disassemble_dwarf_expression (stream, arch, addr_size, offset_size, | |
4085 | start, data, data + ul, indent + 2, | |
4086 | all, per_cu); | |
4087 | data += ul; | |
4088 | continue; | |
49f6c839 | 4089 | |
a24f71ab JK |
4090 | case DW_OP_GNU_parameter_ref: |
4091 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4092 | data += 4; | |
4093 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4094 | break; | |
4095 | ||
49f6c839 DE |
4096 | case DW_OP_GNU_addr_index: |
4097 | data = safe_read_uleb128 (data, end, &ul); | |
4098 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4099 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); | |
4100 | break; | |
4101 | case DW_OP_GNU_const_index: | |
4102 | data = safe_read_uleb128 (data, end, &ul); | |
4103 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4104 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4105 | break; | |
a6b786da KB |
4106 | |
4107 | case DW_OP_GNU_variable_value: | |
4108 | ul = extract_unsigned_integer (data, offset_size, | |
4109 | gdbarch_byte_order (arch)); | |
4110 | data += offset_size; | |
4111 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
4112 | break; | |
9eae7c52 TT |
4113 | } |
4114 | ||
4115 | fprintf_filtered (stream, "\n"); | |
4116 | } | |
c3228f12 | 4117 | |
08922a10 | 4118 | return data; |
4c2df51b DJ |
4119 | } |
4120 | ||
08922a10 SS |
4121 | /* Describe a single location, which may in turn consist of multiple |
4122 | pieces. */ | |
a55cc764 | 4123 | |
08922a10 SS |
4124 | static void |
4125 | locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr, | |
0d45f56e | 4126 | struct ui_file *stream, |
56eb65bd | 4127 | const gdb_byte *data, size_t size, |
9eae7c52 | 4128 | struct objfile *objfile, unsigned int addr_size, |
5e44ecb3 | 4129 | int offset_size, struct dwarf2_per_cu_data *per_cu) |
08922a10 | 4130 | { |
0d45f56e | 4131 | const gdb_byte *end = data + size; |
9eae7c52 | 4132 | int first_piece = 1, bad = 0; |
08922a10 | 4133 | |
08922a10 SS |
4134 | while (data < end) |
4135 | { | |
9eae7c52 TT |
4136 | const gdb_byte *here = data; |
4137 | int disassemble = 1; | |
4138 | ||
4139 | if (first_piece) | |
4140 | first_piece = 0; | |
4141 | else | |
4142 | fprintf_filtered (stream, _(", and ")); | |
08922a10 | 4143 | |
b4f54984 | 4144 | if (!dwarf_always_disassemble) |
9eae7c52 | 4145 | { |
3e43a32a | 4146 | data = locexpr_describe_location_piece (symbol, stream, |
49f6c839 | 4147 | addr, objfile, per_cu, |
9eae7c52 TT |
4148 | data, end, addr_size); |
4149 | /* If we printed anything, or if we have an empty piece, | |
4150 | then don't disassemble. */ | |
4151 | if (data != here | |
4152 | || data[0] == DW_OP_piece | |
4153 | || data[0] == DW_OP_bit_piece) | |
4154 | disassemble = 0; | |
08922a10 | 4155 | } |
9eae7c52 | 4156 | if (disassemble) |
2bda9cc5 JK |
4157 | { |
4158 | fprintf_filtered (stream, _("a complex DWARF expression:\n")); | |
4159 | data = disassemble_dwarf_expression (stream, | |
4160 | get_objfile_arch (objfile), | |
4161 | addr_size, offset_size, data, | |
4162 | data, end, 0, | |
b4f54984 | 4163 | dwarf_always_disassemble, |
2bda9cc5 JK |
4164 | per_cu); |
4165 | } | |
9eae7c52 TT |
4166 | |
4167 | if (data < end) | |
08922a10 | 4168 | { |
9eae7c52 | 4169 | int empty = data == here; |
08922a10 | 4170 | |
9eae7c52 TT |
4171 | if (disassemble) |
4172 | fprintf_filtered (stream, " "); | |
4173 | if (data[0] == DW_OP_piece) | |
4174 | { | |
9fccedf7 | 4175 | uint64_t bytes; |
08922a10 | 4176 | |
f664829e | 4177 | data = safe_read_uleb128 (data + 1, end, &bytes); |
08922a10 | 4178 | |
9eae7c52 TT |
4179 | if (empty) |
4180 | fprintf_filtered (stream, _("an empty %s-byte piece"), | |
4181 | pulongest (bytes)); | |
4182 | else | |
4183 | fprintf_filtered (stream, _(" [%s-byte piece]"), | |
4184 | pulongest (bytes)); | |
4185 | } | |
4186 | else if (data[0] == DW_OP_bit_piece) | |
4187 | { | |
9fccedf7 | 4188 | uint64_t bits, offset; |
9eae7c52 | 4189 | |
f664829e DE |
4190 | data = safe_read_uleb128 (data + 1, end, &bits); |
4191 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4192 | |
4193 | if (empty) | |
4194 | fprintf_filtered (stream, | |
4195 | _("an empty %s-bit piece"), | |
4196 | pulongest (bits)); | |
4197 | else | |
4198 | fprintf_filtered (stream, | |
4199 | _(" [%s-bit piece, offset %s bits]"), | |
4200 | pulongest (bits), pulongest (offset)); | |
4201 | } | |
4202 | else | |
4203 | { | |
4204 | bad = 1; | |
4205 | break; | |
4206 | } | |
08922a10 SS |
4207 | } |
4208 | } | |
4209 | ||
4210 | if (bad || data > end) | |
4211 | error (_("Corrupted DWARF2 expression for \"%s\"."), | |
4212 | SYMBOL_PRINT_NAME (symbol)); | |
4213 | } | |
4214 | ||
4215 | /* Print a natural-language description of SYMBOL to STREAM. This | |
4216 | version is for a symbol with a single location. */ | |
a55cc764 | 4217 | |
08922a10 SS |
4218 | static void |
4219 | locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4220 | struct ui_file *stream) | |
4221 | { | |
9a3c8263 SM |
4222 | struct dwarf2_locexpr_baton *dlbaton |
4223 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
08922a10 SS |
4224 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4225 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4226 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
08922a10 | 4227 | |
3e43a32a MS |
4228 | locexpr_describe_location_1 (symbol, addr, stream, |
4229 | dlbaton->data, dlbaton->size, | |
5e44ecb3 TT |
4230 | objfile, addr_size, offset_size, |
4231 | dlbaton->per_cu); | |
08922a10 SS |
4232 | } |
4233 | ||
4234 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4235 | any necessary bytecode in AX. */ | |
a55cc764 | 4236 | |
0d53c4c4 | 4237 | static void |
40f4af28 SM |
4238 | locexpr_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax, |
4239 | struct axs_value *value) | |
a55cc764 | 4240 | { |
9a3c8263 SM |
4241 | struct dwarf2_locexpr_baton *dlbaton |
4242 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
3cf03773 | 4243 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
a55cc764 | 4244 | |
1d6edc3c | 4245 | if (dlbaton->size == 0) |
cabe9ab6 PA |
4246 | value->optimized_out = 1; |
4247 | else | |
40f4af28 SM |
4248 | dwarf2_compile_expr_to_ax (ax, value, addr_size, dlbaton->data, |
4249 | dlbaton->data + dlbaton->size, dlbaton->per_cu); | |
a55cc764 DJ |
4250 | } |
4251 | ||
bb2ec1b3 TT |
4252 | /* symbol_computed_ops 'generate_c_location' method. */ |
4253 | ||
4254 | static void | |
d82b3862 | 4255 | locexpr_generate_c_location (struct symbol *sym, string_file *stream, |
bb2ec1b3 TT |
4256 | struct gdbarch *gdbarch, |
4257 | unsigned char *registers_used, | |
4258 | CORE_ADDR pc, const char *result_name) | |
4259 | { | |
9a3c8263 SM |
4260 | struct dwarf2_locexpr_baton *dlbaton |
4261 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (sym); | |
bb2ec1b3 TT |
4262 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
4263 | ||
4264 | if (dlbaton->size == 0) | |
4265 | error (_("symbol \"%s\" is optimized out"), SYMBOL_NATURAL_NAME (sym)); | |
4266 | ||
4267 | compile_dwarf_expr_to_c (stream, result_name, | |
4268 | sym, pc, gdbarch, registers_used, addr_size, | |
4269 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4270 | dlbaton->per_cu); | |
4271 | } | |
4272 | ||
4c2df51b DJ |
4273 | /* The set of location functions used with the DWARF-2 expression |
4274 | evaluator. */ | |
768a979c | 4275 | const struct symbol_computed_ops dwarf2_locexpr_funcs = { |
4c2df51b | 4276 | locexpr_read_variable, |
e18b2753 | 4277 | locexpr_read_variable_at_entry, |
0b31a4bc | 4278 | locexpr_get_symbol_read_needs, |
4c2df51b | 4279 | locexpr_describe_location, |
f1e6e072 | 4280 | 0, /* location_has_loclist */ |
bb2ec1b3 TT |
4281 | locexpr_tracepoint_var_ref, |
4282 | locexpr_generate_c_location | |
4c2df51b | 4283 | }; |
0d53c4c4 DJ |
4284 | |
4285 | ||
4286 | /* Wrapper functions for location lists. These generally find | |
4287 | the appropriate location expression and call something above. */ | |
4288 | ||
4289 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
4290 | evaluator to calculate the location. */ | |
4291 | static struct value * | |
4292 | loclist_read_variable (struct symbol *symbol, struct frame_info *frame) | |
4293 | { | |
9a3c8263 SM |
4294 | struct dwarf2_loclist_baton *dlbaton |
4295 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
0d53c4c4 | 4296 | struct value *val; |
947bb88f | 4297 | const gdb_byte *data; |
b6b08ebf | 4298 | size_t size; |
8cf6f0b1 | 4299 | CORE_ADDR pc = frame ? get_frame_address_in_block (frame) : 0; |
0d53c4c4 | 4300 | |
8cf6f0b1 | 4301 | data = dwarf2_find_location_expression (dlbaton, &size, pc); |
1d6edc3c JK |
4302 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, data, size, |
4303 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4304 | |
4305 | return val; | |
4306 | } | |
4307 | ||
e18b2753 JK |
4308 | /* Read variable SYMBOL like loclist_read_variable at (callee) FRAME's function |
4309 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
4310 | will be thrown. | |
4311 | ||
4312 | Function always returns non-NULL value, it may be marked optimized out if | |
4313 | inferior frame information is not available. It throws NO_ENTRY_VALUE_ERROR | |
4314 | if it cannot resolve the parameter for any reason. */ | |
4315 | ||
4316 | static struct value * | |
4317 | loclist_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
4318 | { | |
9a3c8263 SM |
4319 | struct dwarf2_loclist_baton *dlbaton |
4320 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
4321 | const gdb_byte *data; |
4322 | size_t size; | |
4323 | CORE_ADDR pc; | |
4324 | ||
4325 | if (frame == NULL || !get_frame_func_if_available (frame, &pc)) | |
4326 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4327 | ||
4328 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4329 | if (data == NULL) | |
4330 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4331 | ||
4332 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, data, size); | |
4333 | } | |
4334 | ||
0b31a4bc TT |
4335 | /* Implementation of get_symbol_read_needs from |
4336 | symbol_computed_ops. */ | |
4337 | ||
4338 | static enum symbol_needs_kind | |
4339 | loclist_symbol_needs (struct symbol *symbol) | |
0d53c4c4 DJ |
4340 | { |
4341 | /* If there's a location list, then assume we need to have a frame | |
4342 | to choose the appropriate location expression. With tracking of | |
4343 | global variables this is not necessarily true, but such tracking | |
4344 | is disabled in GCC at the moment until we figure out how to | |
4345 | represent it. */ | |
4346 | ||
0b31a4bc | 4347 | return SYMBOL_NEEDS_FRAME; |
0d53c4c4 DJ |
4348 | } |
4349 | ||
08922a10 SS |
4350 | /* Print a natural-language description of SYMBOL to STREAM. This |
4351 | version applies when there is a list of different locations, each | |
4352 | with a specified address range. */ | |
4353 | ||
4354 | static void | |
4355 | loclist_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4356 | struct ui_file *stream) | |
0d53c4c4 | 4357 | { |
9a3c8263 SM |
4358 | struct dwarf2_loclist_baton *dlbaton |
4359 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4360 | const gdb_byte *loc_ptr, *buf_end; |
08922a10 SS |
4361 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4362 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
4363 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
4364 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4365 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
d4a087c7 | 4366 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
08922a10 | 4367 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 4368 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); |
08922a10 | 4369 | CORE_ADDR base_address = dlbaton->base_address + base_offset; |
f664829e | 4370 | int done = 0; |
08922a10 SS |
4371 | |
4372 | loc_ptr = dlbaton->data; | |
4373 | buf_end = dlbaton->data + dlbaton->size; | |
4374 | ||
9eae7c52 | 4375 | fprintf_filtered (stream, _("multi-location:\n")); |
08922a10 SS |
4376 | |
4377 | /* Iterate through locations until we run out. */ | |
f664829e | 4378 | while (!done) |
08922a10 | 4379 | { |
f664829e DE |
4380 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
4381 | int length; | |
4382 | enum debug_loc_kind kind; | |
4383 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
4384 | ||
4385 | if (dlbaton->from_dwo) | |
4386 | kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu, | |
4387 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 4388 | &low, &high, byte_order); |
d4a087c7 | 4389 | else |
f664829e DE |
4390 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
4391 | &low, &high, | |
4392 | byte_order, addr_size, | |
4393 | signed_addr_p); | |
4394 | loc_ptr = new_ptr; | |
4395 | switch (kind) | |
08922a10 | 4396 | { |
f664829e DE |
4397 | case DEBUG_LOC_END_OF_LIST: |
4398 | done = 1; | |
4399 | continue; | |
4400 | case DEBUG_LOC_BASE_ADDRESS: | |
d4a087c7 | 4401 | base_address = high + base_offset; |
9eae7c52 | 4402 | fprintf_filtered (stream, _(" Base address %s"), |
08922a10 | 4403 | paddress (gdbarch, base_address)); |
08922a10 | 4404 | continue; |
3771a44c DE |
4405 | case DEBUG_LOC_START_END: |
4406 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
4407 | break; |
4408 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
4409 | case DEBUG_LOC_INVALID_ENTRY: | |
4410 | error (_("Corrupted DWARF expression for symbol \"%s\"."), | |
4411 | SYMBOL_PRINT_NAME (symbol)); | |
4412 | default: | |
4413 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
08922a10 SS |
4414 | } |
4415 | ||
08922a10 SS |
4416 | /* Otherwise, a location expression entry. */ |
4417 | low += base_address; | |
4418 | high += base_address; | |
4419 | ||
3e29f34a MR |
4420 | low = gdbarch_adjust_dwarf2_addr (gdbarch, low); |
4421 | high = gdbarch_adjust_dwarf2_addr (gdbarch, high); | |
4422 | ||
08922a10 SS |
4423 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); |
4424 | loc_ptr += 2; | |
4425 | ||
08922a10 SS |
4426 | /* (It would improve readability to print only the minimum |
4427 | necessary digits of the second number of the range.) */ | |
9eae7c52 | 4428 | fprintf_filtered (stream, _(" Range %s-%s: "), |
08922a10 SS |
4429 | paddress (gdbarch, low), paddress (gdbarch, high)); |
4430 | ||
4431 | /* Now describe this particular location. */ | |
4432 | locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length, | |
5e44ecb3 TT |
4433 | objfile, addr_size, offset_size, |
4434 | dlbaton->per_cu); | |
9eae7c52 TT |
4435 | |
4436 | fprintf_filtered (stream, "\n"); | |
08922a10 SS |
4437 | |
4438 | loc_ptr += length; | |
4439 | } | |
0d53c4c4 DJ |
4440 | } |
4441 | ||
4442 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4443 | any necessary bytecode in AX. */ | |
4444 | static void | |
40f4af28 SM |
4445 | loclist_tracepoint_var_ref (struct symbol *symbol, struct agent_expr *ax, |
4446 | struct axs_value *value) | |
0d53c4c4 | 4447 | { |
9a3c8263 SM |
4448 | struct dwarf2_loclist_baton *dlbaton |
4449 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4450 | const gdb_byte *data; |
b6b08ebf | 4451 | size_t size; |
3cf03773 | 4452 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
0d53c4c4 | 4453 | |
8cf6f0b1 | 4454 | data = dwarf2_find_location_expression (dlbaton, &size, ax->scope); |
1d6edc3c | 4455 | if (size == 0) |
cabe9ab6 PA |
4456 | value->optimized_out = 1; |
4457 | else | |
40f4af28 | 4458 | dwarf2_compile_expr_to_ax (ax, value, addr_size, data, data + size, |
9f6f94ff | 4459 | dlbaton->per_cu); |
0d53c4c4 DJ |
4460 | } |
4461 | ||
bb2ec1b3 TT |
4462 | /* symbol_computed_ops 'generate_c_location' method. */ |
4463 | ||
4464 | static void | |
d82b3862 | 4465 | loclist_generate_c_location (struct symbol *sym, string_file *stream, |
bb2ec1b3 TT |
4466 | struct gdbarch *gdbarch, |
4467 | unsigned char *registers_used, | |
4468 | CORE_ADDR pc, const char *result_name) | |
4469 | { | |
9a3c8263 SM |
4470 | struct dwarf2_loclist_baton *dlbaton |
4471 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (sym); | |
bb2ec1b3 TT |
4472 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
4473 | const gdb_byte *data; | |
4474 | size_t size; | |
4475 | ||
4476 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4477 | if (size == 0) | |
4478 | error (_("symbol \"%s\" is optimized out"), SYMBOL_NATURAL_NAME (sym)); | |
4479 | ||
4480 | compile_dwarf_expr_to_c (stream, result_name, | |
4481 | sym, pc, gdbarch, registers_used, addr_size, | |
4482 | data, data + size, | |
4483 | dlbaton->per_cu); | |
4484 | } | |
4485 | ||
0d53c4c4 DJ |
4486 | /* The set of location functions used with the DWARF-2 expression |
4487 | evaluator and location lists. */ | |
768a979c | 4488 | const struct symbol_computed_ops dwarf2_loclist_funcs = { |
0d53c4c4 | 4489 | loclist_read_variable, |
e18b2753 | 4490 | loclist_read_variable_at_entry, |
0b31a4bc | 4491 | loclist_symbol_needs, |
0d53c4c4 | 4492 | loclist_describe_location, |
f1e6e072 | 4493 | 1, /* location_has_loclist */ |
bb2ec1b3 TT |
4494 | loclist_tracepoint_var_ref, |
4495 | loclist_generate_c_location | |
0d53c4c4 | 4496 | }; |
8e3b41a9 JK |
4497 | |
4498 | void | |
4499 | _initialize_dwarf2loc (void) | |
4500 | { | |
ccce17b0 YQ |
4501 | add_setshow_zuinteger_cmd ("entry-values", class_maintenance, |
4502 | &entry_values_debug, | |
4503 | _("Set entry values and tail call frames " | |
4504 | "debugging."), | |
4505 | _("Show entry values and tail call frames " | |
4506 | "debugging."), | |
4507 | _("When non-zero, the process of determining " | |
4508 | "parameter values from function entry point " | |
4509 | "and tail call frames will be printed."), | |
4510 | NULL, | |
4511 | show_entry_values_debug, | |
4512 | &setdebuglist, &showdebuglist); | |
8e3b41a9 | 4513 | } |