Commit | Line | Data |
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4c2df51b | 1 | /* DWARF 2 location expression support for GDB. |
feb13ab0 | 2 | |
618f726f | 3 | Copyright (C) 2003-2016 Free Software Foundation, Inc. |
feb13ab0 | 4 | |
4c2df51b DJ |
5 | Contributed by Daniel Jacobowitz, MontaVista Software, Inc. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 JB |
11 | the Free Software Foundation; either version 3 of the License, or |
12 | (at your option) any later version. | |
4c2df51b | 13 | |
a9762ec7 JB |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
4c2df51b DJ |
18 | |
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
4c2df51b DJ |
21 | |
22 | #include "defs.h" | |
23 | #include "ui-out.h" | |
24 | #include "value.h" | |
25 | #include "frame.h" | |
26 | #include "gdbcore.h" | |
27 | #include "target.h" | |
28 | #include "inferior.h" | |
a55cc764 DJ |
29 | #include "ax.h" |
30 | #include "ax-gdb.h" | |
e4adbba9 | 31 | #include "regcache.h" |
c3228f12 | 32 | #include "objfiles.h" |
edb3359d | 33 | #include "block.h" |
8e3b41a9 | 34 | #include "gdbcmd.h" |
0fde2c53 | 35 | #include "complaints.h" |
fa8f86ff | 36 | #include "dwarf2.h" |
4c2df51b DJ |
37 | #include "dwarf2expr.h" |
38 | #include "dwarf2loc.h" | |
e7802207 | 39 | #include "dwarf2-frame.h" |
bb2ec1b3 | 40 | #include "compile/compile.h" |
ad06383f | 41 | #include "selftest.h" |
325fac50 | 42 | #include <algorithm> |
58414334 | 43 | #include <vector> |
4c2df51b | 44 | |
b4f54984 | 45 | extern int dwarf_always_disassemble; |
9eae7c52 | 46 | |
1632a688 JK |
47 | static struct value *dwarf2_evaluate_loc_desc_full (struct type *type, |
48 | struct frame_info *frame, | |
49 | const gdb_byte *data, | |
56eb65bd SP |
50 | size_t size, |
51 | struct dwarf2_per_cu_data *per_cu, | |
1632a688 | 52 | LONGEST byte_offset); |
8cf6f0b1 | 53 | |
192ca6d8 TT |
54 | static struct call_site_parameter *dwarf_expr_reg_to_entry_parameter |
55 | (struct frame_info *frame, | |
56 | enum call_site_parameter_kind kind, | |
57 | union call_site_parameter_u kind_u, | |
58 | struct dwarf2_per_cu_data **per_cu_return); | |
59 | ||
f664829e DE |
60 | /* Until these have formal names, we define these here. |
61 | ref: http://gcc.gnu.org/wiki/DebugFission | |
62 | Each entry in .debug_loc.dwo begins with a byte that describes the entry, | |
63 | and is then followed by data specific to that entry. */ | |
64 | ||
65 | enum debug_loc_kind | |
66 | { | |
67 | /* Indicates the end of the list of entries. */ | |
68 | DEBUG_LOC_END_OF_LIST = 0, | |
69 | ||
70 | /* This is followed by an unsigned LEB128 number that is an index into | |
71 | .debug_addr and specifies the base address for all following entries. */ | |
72 | DEBUG_LOC_BASE_ADDRESS = 1, | |
73 | ||
74 | /* This is followed by two unsigned LEB128 numbers that are indices into | |
75 | .debug_addr and specify the beginning and ending addresses, and then | |
76 | a normal location expression as in .debug_loc. */ | |
3771a44c DE |
77 | DEBUG_LOC_START_END = 2, |
78 | ||
79 | /* This is followed by an unsigned LEB128 number that is an index into | |
80 | .debug_addr and specifies the beginning address, and a 4 byte unsigned | |
81 | number that specifies the length, and then a normal location expression | |
82 | as in .debug_loc. */ | |
83 | DEBUG_LOC_START_LENGTH = 3, | |
f664829e DE |
84 | |
85 | /* An internal value indicating there is insufficient data. */ | |
86 | DEBUG_LOC_BUFFER_OVERFLOW = -1, | |
87 | ||
88 | /* An internal value indicating an invalid kind of entry was found. */ | |
89 | DEBUG_LOC_INVALID_ENTRY = -2 | |
90 | }; | |
91 | ||
b6807d98 TT |
92 | /* Helper function which throws an error if a synthetic pointer is |
93 | invalid. */ | |
94 | ||
95 | static void | |
96 | invalid_synthetic_pointer (void) | |
97 | { | |
98 | error (_("access outside bounds of object " | |
99 | "referenced via synthetic pointer")); | |
100 | } | |
101 | ||
f664829e DE |
102 | /* Decode the addresses in a non-dwo .debug_loc entry. |
103 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
104 | The encoded low,high addresses are return in *LOW,*HIGH. | |
105 | The result indicates the kind of entry found. */ | |
106 | ||
107 | static enum debug_loc_kind | |
108 | decode_debug_loc_addresses (const gdb_byte *loc_ptr, const gdb_byte *buf_end, | |
109 | const gdb_byte **new_ptr, | |
110 | CORE_ADDR *low, CORE_ADDR *high, | |
111 | enum bfd_endian byte_order, | |
112 | unsigned int addr_size, | |
113 | int signed_addr_p) | |
114 | { | |
115 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); | |
116 | ||
117 | if (buf_end - loc_ptr < 2 * addr_size) | |
118 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
119 | ||
120 | if (signed_addr_p) | |
121 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
122 | else | |
123 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
124 | loc_ptr += addr_size; | |
125 | ||
126 | if (signed_addr_p) | |
127 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
128 | else | |
129 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
130 | loc_ptr += addr_size; | |
131 | ||
132 | *new_ptr = loc_ptr; | |
133 | ||
134 | /* A base-address-selection entry. */ | |
135 | if ((*low & base_mask) == base_mask) | |
136 | return DEBUG_LOC_BASE_ADDRESS; | |
137 | ||
138 | /* An end-of-list entry. */ | |
139 | if (*low == 0 && *high == 0) | |
140 | return DEBUG_LOC_END_OF_LIST; | |
141 | ||
3771a44c | 142 | return DEBUG_LOC_START_END; |
f664829e DE |
143 | } |
144 | ||
145 | /* Decode the addresses in .debug_loc.dwo entry. | |
146 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
147 | The encoded low,high addresses are return in *LOW,*HIGH. | |
148 | The result indicates the kind of entry found. */ | |
149 | ||
150 | static enum debug_loc_kind | |
151 | decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu, | |
152 | const gdb_byte *loc_ptr, | |
153 | const gdb_byte *buf_end, | |
154 | const gdb_byte **new_ptr, | |
3771a44c DE |
155 | CORE_ADDR *low, CORE_ADDR *high, |
156 | enum bfd_endian byte_order) | |
f664829e | 157 | { |
9fccedf7 | 158 | uint64_t low_index, high_index; |
f664829e DE |
159 | |
160 | if (loc_ptr == buf_end) | |
161 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
162 | ||
163 | switch (*loc_ptr++) | |
164 | { | |
165 | case DEBUG_LOC_END_OF_LIST: | |
166 | *new_ptr = loc_ptr; | |
167 | return DEBUG_LOC_END_OF_LIST; | |
168 | case DEBUG_LOC_BASE_ADDRESS: | |
169 | *low = 0; | |
170 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
171 | if (loc_ptr == NULL) | |
172 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
173 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
174 | *new_ptr = loc_ptr; | |
175 | return DEBUG_LOC_BASE_ADDRESS; | |
3771a44c | 176 | case DEBUG_LOC_START_END: |
f664829e DE |
177 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
178 | if (loc_ptr == NULL) | |
179 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
180 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
181 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
182 | if (loc_ptr == NULL) | |
183 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
184 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
185 | *new_ptr = loc_ptr; | |
3771a44c DE |
186 | return DEBUG_LOC_START_END; |
187 | case DEBUG_LOC_START_LENGTH: | |
188 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); | |
189 | if (loc_ptr == NULL) | |
190 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
191 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
192 | if (loc_ptr + 4 > buf_end) | |
193 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
194 | *high = *low; | |
195 | *high += extract_unsigned_integer (loc_ptr, 4, byte_order); | |
196 | *new_ptr = loc_ptr + 4; | |
197 | return DEBUG_LOC_START_LENGTH; | |
f664829e DE |
198 | default: |
199 | return DEBUG_LOC_INVALID_ENTRY; | |
200 | } | |
201 | } | |
202 | ||
8cf6f0b1 | 203 | /* A function for dealing with location lists. Given a |
0d53c4c4 DJ |
204 | symbol baton (BATON) and a pc value (PC), find the appropriate |
205 | location expression, set *LOCEXPR_LENGTH, and return a pointer | |
206 | to the beginning of the expression. Returns NULL on failure. | |
207 | ||
208 | For now, only return the first matching location expression; there | |
209 | can be more than one in the list. */ | |
210 | ||
8cf6f0b1 TT |
211 | const gdb_byte * |
212 | dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton, | |
213 | size_t *locexpr_length, CORE_ADDR pc) | |
0d53c4c4 | 214 | { |
ae0d2f24 | 215 | struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu); |
f7fd4728 | 216 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
e17a4113 | 217 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
ae0d2f24 | 218 | unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu); |
d4a087c7 | 219 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
8edfa926 | 220 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 221 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (baton->per_cu); |
8edfa926 | 222 | CORE_ADDR base_address = baton->base_address + base_offset; |
f664829e | 223 | const gdb_byte *loc_ptr, *buf_end; |
0d53c4c4 DJ |
224 | |
225 | loc_ptr = baton->data; | |
226 | buf_end = baton->data + baton->size; | |
227 | ||
228 | while (1) | |
229 | { | |
f664829e DE |
230 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
231 | int length; | |
232 | enum debug_loc_kind kind; | |
233 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
234 | ||
235 | if (baton->from_dwo) | |
236 | kind = decode_debug_loc_dwo_addresses (baton->per_cu, | |
237 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 238 | &low, &high, byte_order); |
d4a087c7 | 239 | else |
f664829e DE |
240 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
241 | &low, &high, | |
242 | byte_order, addr_size, | |
243 | signed_addr_p); | |
244 | loc_ptr = new_ptr; | |
245 | switch (kind) | |
1d6edc3c | 246 | { |
f664829e | 247 | case DEBUG_LOC_END_OF_LIST: |
1d6edc3c JK |
248 | *locexpr_length = 0; |
249 | return NULL; | |
f664829e DE |
250 | case DEBUG_LOC_BASE_ADDRESS: |
251 | base_address = high + base_offset; | |
252 | continue; | |
3771a44c DE |
253 | case DEBUG_LOC_START_END: |
254 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
255 | break; |
256 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
257 | case DEBUG_LOC_INVALID_ENTRY: | |
258 | error (_("dwarf2_find_location_expression: " | |
259 | "Corrupted DWARF expression.")); | |
260 | default: | |
261 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
1d6edc3c | 262 | } |
b5758fe4 | 263 | |
bed911e5 | 264 | /* Otherwise, a location expression entry. |
8ddd5a6c DE |
265 | If the entry is from a DWO, don't add base address: the entry is from |
266 | .debug_addr which already has the DWARF "base address". We still add | |
267 | base_offset in case we're debugging a PIE executable. */ | |
268 | if (baton->from_dwo) | |
269 | { | |
270 | low += base_offset; | |
271 | high += base_offset; | |
272 | } | |
273 | else | |
bed911e5 DE |
274 | { |
275 | low += base_address; | |
276 | high += base_address; | |
277 | } | |
0d53c4c4 | 278 | |
e17a4113 | 279 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); |
0d53c4c4 DJ |
280 | loc_ptr += 2; |
281 | ||
e18b2753 JK |
282 | if (low == high && pc == low) |
283 | { | |
284 | /* This is entry PC record present only at entry point | |
285 | of a function. Verify it is really the function entry point. */ | |
286 | ||
3977b71f | 287 | const struct block *pc_block = block_for_pc (pc); |
e18b2753 JK |
288 | struct symbol *pc_func = NULL; |
289 | ||
290 | if (pc_block) | |
291 | pc_func = block_linkage_function (pc_block); | |
292 | ||
293 | if (pc_func && pc == BLOCK_START (SYMBOL_BLOCK_VALUE (pc_func))) | |
294 | { | |
295 | *locexpr_length = length; | |
296 | return loc_ptr; | |
297 | } | |
298 | } | |
299 | ||
0d53c4c4 DJ |
300 | if (pc >= low && pc < high) |
301 | { | |
302 | *locexpr_length = length; | |
303 | return loc_ptr; | |
304 | } | |
305 | ||
306 | loc_ptr += length; | |
307 | } | |
308 | } | |
309 | ||
4c2df51b DJ |
310 | /* This is the baton used when performing dwarf2 expression |
311 | evaluation. */ | |
312 | struct dwarf_expr_baton | |
313 | { | |
314 | struct frame_info *frame; | |
17ea53c3 | 315 | struct dwarf2_per_cu_data *per_cu; |
08412b07 | 316 | CORE_ADDR obj_address; |
4c2df51b DJ |
317 | }; |
318 | ||
f1e6e072 TT |
319 | /* Implement find_frame_base_location method for LOC_BLOCK functions using |
320 | DWARF expression for its DW_AT_frame_base. */ | |
321 | ||
322 | static void | |
323 | locexpr_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
324 | const gdb_byte **start, size_t *length) | |
325 | { | |
9a3c8263 SM |
326 | struct dwarf2_locexpr_baton *symbaton |
327 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
328 | |
329 | *length = symbaton->size; | |
330 | *start = symbaton->data; | |
331 | } | |
332 | ||
7d1c9c9b JB |
333 | /* Implement the struct symbol_block_ops::get_frame_base method for |
334 | LOC_BLOCK functions using a DWARF expression as its DW_AT_frame_base. */ | |
63e43d3a PMR |
335 | |
336 | static CORE_ADDR | |
7d1c9c9b | 337 | locexpr_get_frame_base (struct symbol *framefunc, struct frame_info *frame) |
63e43d3a PMR |
338 | { |
339 | struct gdbarch *gdbarch; | |
340 | struct type *type; | |
341 | struct dwarf2_locexpr_baton *dlbaton; | |
342 | const gdb_byte *start; | |
343 | size_t length; | |
344 | struct value *result; | |
345 | ||
346 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
347 | Thus, it's supposed to provide the find_frame_base_location method as | |
348 | well. */ | |
349 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
350 | ||
351 | gdbarch = get_frame_arch (frame); | |
352 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 353 | dlbaton = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); |
63e43d3a PMR |
354 | |
355 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
356 | (framefunc, get_frame_pc (frame), &start, &length); | |
357 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
358 | dlbaton->per_cu); | |
359 | ||
360 | /* The DW_AT_frame_base attribute contains a location description which | |
361 | computes the base address itself. However, the call to | |
362 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
363 | that address. The frame base address is thus this variable's | |
364 | address. */ | |
365 | return value_address (result); | |
366 | } | |
367 | ||
f1e6e072 TT |
368 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
369 | function uses DWARF expression for its DW_AT_frame_base. */ | |
370 | ||
371 | const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs = | |
372 | { | |
63e43d3a | 373 | locexpr_find_frame_base_location, |
7d1c9c9b | 374 | locexpr_get_frame_base |
f1e6e072 TT |
375 | }; |
376 | ||
377 | /* Implement find_frame_base_location method for LOC_BLOCK functions using | |
378 | DWARF location list for its DW_AT_frame_base. */ | |
379 | ||
380 | static void | |
381 | loclist_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
382 | const gdb_byte **start, size_t *length) | |
383 | { | |
9a3c8263 SM |
384 | struct dwarf2_loclist_baton *symbaton |
385 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
386 | |
387 | *start = dwarf2_find_location_expression (symbaton, length, pc); | |
388 | } | |
389 | ||
7d1c9c9b JB |
390 | /* Implement the struct symbol_block_ops::get_frame_base method for |
391 | LOC_BLOCK functions using a DWARF location list as its DW_AT_frame_base. */ | |
392 | ||
393 | static CORE_ADDR | |
394 | loclist_get_frame_base (struct symbol *framefunc, struct frame_info *frame) | |
395 | { | |
396 | struct gdbarch *gdbarch; | |
397 | struct type *type; | |
398 | struct dwarf2_loclist_baton *dlbaton; | |
399 | const gdb_byte *start; | |
400 | size_t length; | |
401 | struct value *result; | |
402 | ||
403 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
404 | Thus, it's supposed to provide the find_frame_base_location method as | |
405 | well. */ | |
406 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
407 | ||
408 | gdbarch = get_frame_arch (frame); | |
409 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 410 | dlbaton = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); |
7d1c9c9b JB |
411 | |
412 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
413 | (framefunc, get_frame_pc (frame), &start, &length); | |
414 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
415 | dlbaton->per_cu); | |
416 | ||
417 | /* The DW_AT_frame_base attribute contains a location description which | |
418 | computes the base address itself. However, the call to | |
419 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
420 | that address. The frame base address is thus this variable's | |
421 | address. */ | |
422 | return value_address (result); | |
423 | } | |
424 | ||
f1e6e072 TT |
425 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
426 | function uses DWARF location list for its DW_AT_frame_base. */ | |
427 | ||
428 | const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs = | |
429 | { | |
63e43d3a | 430 | loclist_find_frame_base_location, |
7d1c9c9b | 431 | loclist_get_frame_base |
f1e6e072 TT |
432 | }; |
433 | ||
af945b75 TT |
434 | /* See dwarf2loc.h. */ |
435 | ||
436 | void | |
437 | func_get_frame_base_dwarf_block (struct symbol *framefunc, CORE_ADDR pc, | |
438 | const gdb_byte **start, size_t *length) | |
0936ad1d | 439 | { |
f1e6e072 | 440 | if (SYMBOL_BLOCK_OPS (framefunc) != NULL) |
0d53c4c4 | 441 | { |
f1e6e072 | 442 | const struct symbol_block_ops *ops_block = SYMBOL_BLOCK_OPS (framefunc); |
22c6caba | 443 | |
f1e6e072 | 444 | ops_block->find_frame_base_location (framefunc, pc, start, length); |
0d53c4c4 DJ |
445 | } |
446 | else | |
f1e6e072 | 447 | *length = 0; |
0d53c4c4 | 448 | |
1d6edc3c | 449 | if (*length == 0) |
8a3fe4f8 | 450 | error (_("Could not find the frame base for \"%s\"."), |
0d53c4c4 | 451 | SYMBOL_NATURAL_NAME (framefunc)); |
4c2df51b DJ |
452 | } |
453 | ||
4c2df51b | 454 | static CORE_ADDR |
192ca6d8 | 455 | get_frame_pc_for_per_cu_dwarf_call (void *baton) |
4c2df51b | 456 | { |
192ca6d8 | 457 | dwarf_expr_context *ctx = (dwarf_expr_context *) baton; |
4c2df51b | 458 | |
192ca6d8 | 459 | return ctx->get_frame_pc (); |
4c2df51b DJ |
460 | } |
461 | ||
5c631832 | 462 | static void |
b64f50a1 | 463 | per_cu_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset, |
192ca6d8 | 464 | struct dwarf2_per_cu_data *per_cu) |
5c631832 JK |
465 | { |
466 | struct dwarf2_locexpr_baton block; | |
467 | ||
192ca6d8 TT |
468 | block = dwarf2_fetch_die_loc_cu_off (die_offset, per_cu, |
469 | get_frame_pc_for_per_cu_dwarf_call, | |
470 | ctx); | |
5c631832 JK |
471 | |
472 | /* DW_OP_call_ref is currently not supported. */ | |
473 | gdb_assert (block.per_cu == per_cu); | |
474 | ||
595d2e30 | 475 | ctx->eval (block.data, block.size); |
5c631832 JK |
476 | } |
477 | ||
192ca6d8 | 478 | class dwarf_evaluate_loc_desc : public dwarf_expr_context |
5c631832 | 479 | { |
192ca6d8 | 480 | public: |
5c631832 | 481 | |
192ca6d8 TT |
482 | struct frame_info *frame; |
483 | struct dwarf2_per_cu_data *per_cu; | |
484 | CORE_ADDR obj_address; | |
5c631832 | 485 | |
192ca6d8 TT |
486 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for |
487 | the frame in BATON. */ | |
8a9b8146 | 488 | |
192ca6d8 TT |
489 | CORE_ADDR get_frame_cfa () OVERRIDE |
490 | { | |
491 | return dwarf2_frame_cfa (frame); | |
492 | } | |
8a9b8146 | 493 | |
192ca6d8 TT |
494 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for |
495 | the frame in BATON. */ | |
496 | ||
497 | CORE_ADDR get_frame_pc () OVERRIDE | |
498 | { | |
499 | return get_frame_address_in_block (frame); | |
500 | } | |
501 | ||
502 | /* Using the objfile specified in BATON, find the address for the | |
503 | current thread's thread-local storage with offset OFFSET. */ | |
504 | CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE | |
505 | { | |
506 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); | |
507 | ||
508 | return target_translate_tls_address (objfile, offset); | |
509 | } | |
510 | ||
511 | /* Helper interface of per_cu_dwarf_call for | |
512 | dwarf2_evaluate_loc_desc. */ | |
513 | ||
514 | void dwarf_call (cu_offset die_offset) OVERRIDE | |
515 | { | |
516 | per_cu_dwarf_call (this, die_offset, per_cu); | |
517 | } | |
518 | ||
7d5697f9 | 519 | struct type *get_base_type (cu_offset die_offset, int size) OVERRIDE |
192ca6d8 | 520 | { |
7d5697f9 TT |
521 | struct type *result = dwarf2_get_die_type (die_offset, per_cu); |
522 | if (result == NULL) | |
523 | error (_("Could not find type for DW_OP_GNU_const_type")); | |
524 | if (size != 0 && TYPE_LENGTH (result) != size) | |
525 | error (_("DW_OP_GNU_const_type has different sizes for type and data")); | |
526 | return result; | |
192ca6d8 TT |
527 | } |
528 | ||
529 | /* Callback function for dwarf2_evaluate_loc_desc. | |
530 | Fetch the address indexed by DW_OP_GNU_addr_index. */ | |
531 | ||
532 | CORE_ADDR get_addr_index (unsigned int index) OVERRIDE | |
533 | { | |
534 | return dwarf2_read_addr_index (per_cu, index); | |
535 | } | |
536 | ||
537 | /* Callback function for get_object_address. Return the address of the VLA | |
538 | object. */ | |
539 | ||
540 | CORE_ADDR get_object_address () OVERRIDE | |
541 | { | |
542 | if (obj_address == 0) | |
543 | error (_("Location address is not set.")); | |
544 | return obj_address; | |
545 | } | |
546 | ||
547 | /* Execute DWARF block of call_site_parameter which matches KIND and | |
548 | KIND_U. Choose DEREF_SIZE value of that parameter. Search | |
549 | caller of this objects's frame. | |
550 | ||
551 | The caller can be from a different CU - per_cu_dwarf_call | |
552 | implementation can be more simple as it does not support cross-CU | |
553 | DWARF executions. */ | |
554 | ||
555 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
556 | union call_site_parameter_u kind_u, | |
557 | int deref_size) OVERRIDE | |
558 | { | |
559 | struct frame_info *caller_frame; | |
560 | struct dwarf2_per_cu_data *caller_per_cu; | |
192ca6d8 TT |
561 | struct call_site_parameter *parameter; |
562 | const gdb_byte *data_src; | |
563 | size_t size; | |
564 | ||
565 | caller_frame = get_prev_frame (frame); | |
566 | ||
567 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, | |
568 | &caller_per_cu); | |
569 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
570 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
571 | ||
572 | /* DEREF_SIZE size is not verified here. */ | |
573 | if (data_src == NULL) | |
574 | throw_error (NO_ENTRY_VALUE_ERROR, | |
575 | _("Cannot resolve DW_AT_GNU_call_site_data_value")); | |
576 | ||
7d5697f9 TT |
577 | scoped_restore save_frame = make_scoped_restore (&this->frame, |
578 | caller_frame); | |
579 | scoped_restore save_per_cu = make_scoped_restore (&this->per_cu, | |
580 | caller_per_cu); | |
581 | scoped_restore save_obj_addr = make_scoped_restore (&this->obj_address, | |
582 | (CORE_ADDR) 0); | |
192ca6d8 TT |
583 | |
584 | scoped_restore save_arch = make_scoped_restore (&this->gdbarch); | |
585 | this->gdbarch | |
7d5697f9 | 586 | = get_objfile_arch (dwarf2_per_cu_objfile (per_cu)); |
192ca6d8 | 587 | scoped_restore save_addr_size = make_scoped_restore (&this->addr_size); |
7d5697f9 | 588 | this->addr_size = dwarf2_per_cu_addr_size (per_cu); |
192ca6d8 | 589 | scoped_restore save_offset = make_scoped_restore (&this->offset); |
7d5697f9 | 590 | this->offset = dwarf2_per_cu_text_offset (per_cu); |
192ca6d8 TT |
591 | |
592 | this->eval (data_src, size); | |
593 | } | |
594 | ||
595 | /* Using the frame specified in BATON, find the location expression | |
596 | describing the frame base. Return a pointer to it in START and | |
597 | its length in LENGTH. */ | |
598 | void get_frame_base (const gdb_byte **start, size_t * length) OVERRIDE | |
599 | { | |
600 | /* FIXME: cagney/2003-03-26: This code should be using | |
601 | get_frame_base_address(), and then implement a dwarf2 specific | |
602 | this_base method. */ | |
603 | struct symbol *framefunc; | |
604 | const struct block *bl = get_frame_block (frame, NULL); | |
605 | ||
606 | if (bl == NULL) | |
607 | error (_("frame address is not available.")); | |
608 | ||
609 | /* Use block_linkage_function, which returns a real (not inlined) | |
610 | function, instead of get_frame_function, which may return an | |
611 | inlined function. */ | |
612 | framefunc = block_linkage_function (bl); | |
613 | ||
614 | /* If we found a frame-relative symbol then it was certainly within | |
615 | some function associated with a frame. If we can't find the frame, | |
616 | something has gone wrong. */ | |
617 | gdb_assert (framefunc != NULL); | |
618 | ||
619 | func_get_frame_base_dwarf_block (framefunc, | |
620 | get_frame_address_in_block (frame), | |
621 | start, length); | |
622 | } | |
623 | ||
624 | /* Read memory at ADDR (length LEN) into BUF. */ | |
625 | ||
626 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE | |
627 | { | |
628 | read_memory (addr, buf, len); | |
629 | } | |
630 | ||
631 | /* Using the frame specified in BATON, return the value of register | |
632 | REGNUM, treated as a pointer. */ | |
633 | CORE_ADDR read_addr_from_reg (int dwarf_regnum) OVERRIDE | |
634 | { | |
635 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
636 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); | |
637 | ||
638 | return address_from_register (regnum, frame); | |
639 | } | |
640 | ||
641 | /* Implement "get_reg_value" callback. */ | |
642 | ||
643 | struct value *get_reg_value (struct type *type, int dwarf_regnum) OVERRIDE | |
644 | { | |
645 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
646 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); | |
647 | ||
648 | return value_from_register (type, regnum, frame); | |
649 | } | |
650 | }; | |
8a9b8146 | 651 | |
8e3b41a9 JK |
652 | /* See dwarf2loc.h. */ |
653 | ||
ccce17b0 | 654 | unsigned int entry_values_debug = 0; |
8e3b41a9 JK |
655 | |
656 | /* Helper to set entry_values_debug. */ | |
657 | ||
658 | static void | |
659 | show_entry_values_debug (struct ui_file *file, int from_tty, | |
660 | struct cmd_list_element *c, const char *value) | |
661 | { | |
662 | fprintf_filtered (file, | |
663 | _("Entry values and tail call frames debugging is %s.\n"), | |
664 | value); | |
665 | } | |
666 | ||
667 | /* Find DW_TAG_GNU_call_site's DW_AT_GNU_call_site_target address. | |
668 | CALLER_FRAME (for registers) can be NULL if it is not known. This function | |
669 | always returns valid address or it throws NO_ENTRY_VALUE_ERROR. */ | |
670 | ||
671 | static CORE_ADDR | |
672 | call_site_to_target_addr (struct gdbarch *call_site_gdbarch, | |
673 | struct call_site *call_site, | |
674 | struct frame_info *caller_frame) | |
675 | { | |
676 | switch (FIELD_LOC_KIND (call_site->target)) | |
677 | { | |
678 | case FIELD_LOC_KIND_DWARF_BLOCK: | |
679 | { | |
680 | struct dwarf2_locexpr_baton *dwarf_block; | |
681 | struct value *val; | |
682 | struct type *caller_core_addr_type; | |
683 | struct gdbarch *caller_arch; | |
684 | ||
685 | dwarf_block = FIELD_DWARF_BLOCK (call_site->target); | |
686 | if (dwarf_block == NULL) | |
687 | { | |
7cbd4a93 | 688 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
689 | |
690 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
691 | throw_error (NO_ENTRY_VALUE_ERROR, | |
692 | _("DW_AT_GNU_call_site_target is not specified " | |
693 | "at %s in %s"), | |
694 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 | 695 | (msym.minsym == NULL ? "???" |
efd66ac6 | 696 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
697 | |
698 | } | |
699 | if (caller_frame == NULL) | |
700 | { | |
7cbd4a93 | 701 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
702 | |
703 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
704 | throw_error (NO_ENTRY_VALUE_ERROR, | |
705 | _("DW_AT_GNU_call_site_target DWARF block resolving " | |
706 | "requires known frame which is currently not " | |
707 | "available at %s in %s"), | |
708 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 | 709 | (msym.minsym == NULL ? "???" |
efd66ac6 | 710 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
711 | |
712 | } | |
713 | caller_arch = get_frame_arch (caller_frame); | |
714 | caller_core_addr_type = builtin_type (caller_arch)->builtin_func_ptr; | |
715 | val = dwarf2_evaluate_loc_desc (caller_core_addr_type, caller_frame, | |
716 | dwarf_block->data, dwarf_block->size, | |
717 | dwarf_block->per_cu); | |
718 | /* DW_AT_GNU_call_site_target is a DWARF expression, not a DWARF | |
719 | location. */ | |
720 | if (VALUE_LVAL (val) == lval_memory) | |
721 | return value_address (val); | |
722 | else | |
723 | return value_as_address (val); | |
724 | } | |
725 | ||
726 | case FIELD_LOC_KIND_PHYSNAME: | |
727 | { | |
728 | const char *physname; | |
3b7344d5 | 729 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
730 | |
731 | physname = FIELD_STATIC_PHYSNAME (call_site->target); | |
9112db09 JK |
732 | |
733 | /* Handle both the mangled and demangled PHYSNAME. */ | |
734 | msym = lookup_minimal_symbol (physname, NULL, NULL); | |
3b7344d5 | 735 | if (msym.minsym == NULL) |
8e3b41a9 | 736 | { |
3b7344d5 | 737 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); |
8e3b41a9 JK |
738 | throw_error (NO_ENTRY_VALUE_ERROR, |
739 | _("Cannot find function \"%s\" for a call site target " | |
740 | "at %s in %s"), | |
741 | physname, paddress (call_site_gdbarch, call_site->pc), | |
3b7344d5 TT |
742 | (msym.minsym == NULL ? "???" |
743 | : MSYMBOL_PRINT_NAME (msym.minsym))); | |
8e3b41a9 JK |
744 | |
745 | } | |
77e371c0 | 746 | return BMSYMBOL_VALUE_ADDRESS (msym); |
8e3b41a9 JK |
747 | } |
748 | ||
749 | case FIELD_LOC_KIND_PHYSADDR: | |
750 | return FIELD_STATIC_PHYSADDR (call_site->target); | |
751 | ||
752 | default: | |
753 | internal_error (__FILE__, __LINE__, _("invalid call site target kind")); | |
754 | } | |
755 | } | |
756 | ||
111c6489 JK |
757 | /* Convert function entry point exact address ADDR to the function which is |
758 | compliant with TAIL_CALL_LIST_COMPLETE condition. Throw | |
759 | NO_ENTRY_VALUE_ERROR otherwise. */ | |
760 | ||
761 | static struct symbol * | |
762 | func_addr_to_tail_call_list (struct gdbarch *gdbarch, CORE_ADDR addr) | |
763 | { | |
764 | struct symbol *sym = find_pc_function (addr); | |
765 | struct type *type; | |
766 | ||
767 | if (sym == NULL || BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) != addr) | |
768 | throw_error (NO_ENTRY_VALUE_ERROR, | |
769 | _("DW_TAG_GNU_call_site resolving failed to find function " | |
770 | "name for address %s"), | |
771 | paddress (gdbarch, addr)); | |
772 | ||
773 | type = SYMBOL_TYPE (sym); | |
774 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FUNC); | |
775 | gdb_assert (TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_FUNC); | |
776 | ||
777 | return sym; | |
778 | } | |
779 | ||
2d6c5dc2 JK |
780 | /* Verify function with entry point exact address ADDR can never call itself |
781 | via its tail calls (incl. transitively). Throw NO_ENTRY_VALUE_ERROR if it | |
782 | can call itself via tail calls. | |
783 | ||
784 | If a funtion can tail call itself its entry value based parameters are | |
785 | unreliable. There is no verification whether the value of some/all | |
786 | parameters is unchanged through the self tail call, we expect if there is | |
787 | a self tail call all the parameters can be modified. */ | |
788 | ||
789 | static void | |
790 | func_verify_no_selftailcall (struct gdbarch *gdbarch, CORE_ADDR verify_addr) | |
791 | { | |
792 | struct obstack addr_obstack; | |
793 | struct cleanup *old_chain; | |
794 | CORE_ADDR addr; | |
795 | ||
796 | /* Track here CORE_ADDRs which were already visited. */ | |
797 | htab_t addr_hash; | |
798 | ||
799 | /* The verification is completely unordered. Track here function addresses | |
800 | which still need to be iterated. */ | |
801 | VEC (CORE_ADDR) *todo = NULL; | |
802 | ||
803 | obstack_init (&addr_obstack); | |
804 | old_chain = make_cleanup_obstack_free (&addr_obstack); | |
805 | addr_hash = htab_create_alloc_ex (64, core_addr_hash, core_addr_eq, NULL, | |
806 | &addr_obstack, hashtab_obstack_allocate, | |
807 | NULL); | |
808 | make_cleanup_htab_delete (addr_hash); | |
809 | ||
810 | make_cleanup (VEC_cleanup (CORE_ADDR), &todo); | |
811 | ||
812 | VEC_safe_push (CORE_ADDR, todo, verify_addr); | |
813 | while (!VEC_empty (CORE_ADDR, todo)) | |
814 | { | |
815 | struct symbol *func_sym; | |
816 | struct call_site *call_site; | |
817 | ||
818 | addr = VEC_pop (CORE_ADDR, todo); | |
819 | ||
820 | func_sym = func_addr_to_tail_call_list (gdbarch, addr); | |
821 | ||
822 | for (call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (func_sym)); | |
823 | call_site; call_site = call_site->tail_call_next) | |
824 | { | |
825 | CORE_ADDR target_addr; | |
826 | void **slot; | |
827 | ||
828 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
829 | frames. */ | |
830 | target_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
831 | ||
832 | if (target_addr == verify_addr) | |
833 | { | |
7cbd4a93 | 834 | struct bound_minimal_symbol msym; |
2d6c5dc2 JK |
835 | |
836 | msym = lookup_minimal_symbol_by_pc (verify_addr); | |
837 | throw_error (NO_ENTRY_VALUE_ERROR, | |
838 | _("DW_OP_GNU_entry_value resolving has found " | |
839 | "function \"%s\" at %s can call itself via tail " | |
840 | "calls"), | |
7cbd4a93 | 841 | (msym.minsym == NULL ? "???" |
efd66ac6 | 842 | : MSYMBOL_PRINT_NAME (msym.minsym)), |
2d6c5dc2 JK |
843 | paddress (gdbarch, verify_addr)); |
844 | } | |
845 | ||
846 | slot = htab_find_slot (addr_hash, &target_addr, INSERT); | |
847 | if (*slot == NULL) | |
848 | { | |
849 | *slot = obstack_copy (&addr_obstack, &target_addr, | |
850 | sizeof (target_addr)); | |
851 | VEC_safe_push (CORE_ADDR, todo, target_addr); | |
852 | } | |
853 | } | |
854 | } | |
855 | ||
856 | do_cleanups (old_chain); | |
857 | } | |
858 | ||
111c6489 JK |
859 | /* Print user readable form of CALL_SITE->PC to gdb_stdlog. Used only for |
860 | ENTRY_VALUES_DEBUG. */ | |
861 | ||
862 | static void | |
863 | tailcall_dump (struct gdbarch *gdbarch, const struct call_site *call_site) | |
864 | { | |
865 | CORE_ADDR addr = call_site->pc; | |
7cbd4a93 | 866 | struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (addr - 1); |
111c6489 JK |
867 | |
868 | fprintf_unfiltered (gdb_stdlog, " %s(%s)", paddress (gdbarch, addr), | |
7cbd4a93 | 869 | (msym.minsym == NULL ? "???" |
efd66ac6 | 870 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
111c6489 JK |
871 | |
872 | } | |
873 | ||
874 | /* vec.h needs single word type name, typedef it. */ | |
875 | typedef struct call_site *call_sitep; | |
876 | ||
877 | /* Define VEC (call_sitep) functions. */ | |
878 | DEF_VEC_P (call_sitep); | |
879 | ||
880 | /* Intersect RESULTP with CHAIN to keep RESULTP unambiguous, keep in RESULTP | |
881 | only top callers and bottom callees which are present in both. GDBARCH is | |
882 | used only for ENTRY_VALUES_DEBUG. RESULTP is NULL after return if there are | |
883 | no remaining possibilities to provide unambiguous non-trivial result. | |
884 | RESULTP should point to NULL on the first (initialization) call. Caller is | |
885 | responsible for xfree of any RESULTP data. */ | |
886 | ||
887 | static void | |
888 | chain_candidate (struct gdbarch *gdbarch, struct call_site_chain **resultp, | |
889 | VEC (call_sitep) *chain) | |
890 | { | |
891 | struct call_site_chain *result = *resultp; | |
892 | long length = VEC_length (call_sitep, chain); | |
893 | int callers, callees, idx; | |
894 | ||
895 | if (result == NULL) | |
896 | { | |
897 | /* Create the initial chain containing all the passed PCs. */ | |
898 | ||
224c3ddb SM |
899 | result = ((struct call_site_chain *) |
900 | xmalloc (sizeof (*result) | |
901 | + sizeof (*result->call_site) * (length - 1))); | |
111c6489 JK |
902 | result->length = length; |
903 | result->callers = result->callees = length; | |
19a1b230 AA |
904 | if (!VEC_empty (call_sitep, chain)) |
905 | memcpy (result->call_site, VEC_address (call_sitep, chain), | |
906 | sizeof (*result->call_site) * length); | |
111c6489 JK |
907 | *resultp = result; |
908 | ||
909 | if (entry_values_debug) | |
910 | { | |
911 | fprintf_unfiltered (gdb_stdlog, "tailcall: initial:"); | |
912 | for (idx = 0; idx < length; idx++) | |
913 | tailcall_dump (gdbarch, result->call_site[idx]); | |
914 | fputc_unfiltered ('\n', gdb_stdlog); | |
915 | } | |
916 | ||
917 | return; | |
918 | } | |
919 | ||
920 | if (entry_values_debug) | |
921 | { | |
922 | fprintf_unfiltered (gdb_stdlog, "tailcall: compare:"); | |
923 | for (idx = 0; idx < length; idx++) | |
924 | tailcall_dump (gdbarch, VEC_index (call_sitep, chain, idx)); | |
925 | fputc_unfiltered ('\n', gdb_stdlog); | |
926 | } | |
927 | ||
928 | /* Intersect callers. */ | |
929 | ||
325fac50 | 930 | callers = std::min ((long) result->callers, length); |
111c6489 JK |
931 | for (idx = 0; idx < callers; idx++) |
932 | if (result->call_site[idx] != VEC_index (call_sitep, chain, idx)) | |
933 | { | |
934 | result->callers = idx; | |
935 | break; | |
936 | } | |
937 | ||
938 | /* Intersect callees. */ | |
939 | ||
325fac50 | 940 | callees = std::min ((long) result->callees, length); |
111c6489 JK |
941 | for (idx = 0; idx < callees; idx++) |
942 | if (result->call_site[result->length - 1 - idx] | |
943 | != VEC_index (call_sitep, chain, length - 1 - idx)) | |
944 | { | |
945 | result->callees = idx; | |
946 | break; | |
947 | } | |
948 | ||
949 | if (entry_values_debug) | |
950 | { | |
951 | fprintf_unfiltered (gdb_stdlog, "tailcall: reduced:"); | |
952 | for (idx = 0; idx < result->callers; idx++) | |
953 | tailcall_dump (gdbarch, result->call_site[idx]); | |
954 | fputs_unfiltered (" |", gdb_stdlog); | |
955 | for (idx = 0; idx < result->callees; idx++) | |
956 | tailcall_dump (gdbarch, result->call_site[result->length | |
957 | - result->callees + idx]); | |
958 | fputc_unfiltered ('\n', gdb_stdlog); | |
959 | } | |
960 | ||
961 | if (result->callers == 0 && result->callees == 0) | |
962 | { | |
963 | /* There are no common callers or callees. It could be also a direct | |
964 | call (which has length 0) with ambiguous possibility of an indirect | |
965 | call - CALLERS == CALLEES == 0 is valid during the first allocation | |
966 | but any subsequence processing of such entry means ambiguity. */ | |
967 | xfree (result); | |
968 | *resultp = NULL; | |
969 | return; | |
970 | } | |
971 | ||
972 | /* See call_site_find_chain_1 why there is no way to reach the bottom callee | |
973 | PC again. In such case there must be two different code paths to reach | |
e0619de6 JK |
974 | it. CALLERS + CALLEES equal to LENGTH in the case of self tail-call. */ |
975 | gdb_assert (result->callers + result->callees <= result->length); | |
111c6489 JK |
976 | } |
977 | ||
978 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
979 | assumed frames between them use GDBARCH. Use depth first search so we can | |
980 | keep single CHAIN of call_site's back to CALLER_PC. Function recursion | |
981 | would have needless GDB stack overhead. Caller is responsible for xfree of | |
982 | the returned result. Any unreliability results in thrown | |
983 | NO_ENTRY_VALUE_ERROR. */ | |
984 | ||
985 | static struct call_site_chain * | |
986 | call_site_find_chain_1 (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
987 | CORE_ADDR callee_pc) | |
988 | { | |
c4be5165 | 989 | CORE_ADDR save_callee_pc = callee_pc; |
111c6489 JK |
990 | struct obstack addr_obstack; |
991 | struct cleanup *back_to_retval, *back_to_workdata; | |
992 | struct call_site_chain *retval = NULL; | |
993 | struct call_site *call_site; | |
994 | ||
995 | /* Mark CALL_SITEs so we do not visit the same ones twice. */ | |
996 | htab_t addr_hash; | |
997 | ||
998 | /* CHAIN contains only the intermediate CALL_SITEs. Neither CALLER_PC's | |
999 | call_site nor any possible call_site at CALLEE_PC's function is there. | |
1000 | Any CALL_SITE in CHAIN will be iterated to its siblings - via | |
1001 | TAIL_CALL_NEXT. This is inappropriate for CALLER_PC's call_site. */ | |
1002 | VEC (call_sitep) *chain = NULL; | |
1003 | ||
1004 | /* We are not interested in the specific PC inside the callee function. */ | |
1005 | callee_pc = get_pc_function_start (callee_pc); | |
1006 | if (callee_pc == 0) | |
1007 | throw_error (NO_ENTRY_VALUE_ERROR, _("Unable to find function for PC %s"), | |
c4be5165 | 1008 | paddress (gdbarch, save_callee_pc)); |
111c6489 JK |
1009 | |
1010 | back_to_retval = make_cleanup (free_current_contents, &retval); | |
1011 | ||
1012 | obstack_init (&addr_obstack); | |
1013 | back_to_workdata = make_cleanup_obstack_free (&addr_obstack); | |
1014 | addr_hash = htab_create_alloc_ex (64, core_addr_hash, core_addr_eq, NULL, | |
1015 | &addr_obstack, hashtab_obstack_allocate, | |
1016 | NULL); | |
1017 | make_cleanup_htab_delete (addr_hash); | |
1018 | ||
1019 | make_cleanup (VEC_cleanup (call_sitep), &chain); | |
1020 | ||
1021 | /* Do not push CALL_SITE to CHAIN. Push there only the first tail call site | |
1022 | at the target's function. All the possible tail call sites in the | |
1023 | target's function will get iterated as already pushed into CHAIN via their | |
1024 | TAIL_CALL_NEXT. */ | |
1025 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1026 | ||
1027 | while (call_site) | |
1028 | { | |
1029 | CORE_ADDR target_func_addr; | |
1030 | struct call_site *target_call_site; | |
1031 | ||
1032 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
1033 | frames. */ | |
1034 | target_func_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
1035 | ||
1036 | if (target_func_addr == callee_pc) | |
1037 | { | |
1038 | chain_candidate (gdbarch, &retval, chain); | |
1039 | if (retval == NULL) | |
1040 | break; | |
1041 | ||
1042 | /* There is no way to reach CALLEE_PC again as we would prevent | |
1043 | entering it twice as being already marked in ADDR_HASH. */ | |
1044 | target_call_site = NULL; | |
1045 | } | |
1046 | else | |
1047 | { | |
1048 | struct symbol *target_func; | |
1049 | ||
1050 | target_func = func_addr_to_tail_call_list (gdbarch, target_func_addr); | |
1051 | target_call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (target_func)); | |
1052 | } | |
1053 | ||
1054 | do | |
1055 | { | |
1056 | /* Attempt to visit TARGET_CALL_SITE. */ | |
1057 | ||
1058 | if (target_call_site) | |
1059 | { | |
1060 | void **slot; | |
1061 | ||
1062 | slot = htab_find_slot (addr_hash, &target_call_site->pc, INSERT); | |
1063 | if (*slot == NULL) | |
1064 | { | |
1065 | /* Successfully entered TARGET_CALL_SITE. */ | |
1066 | ||
1067 | *slot = &target_call_site->pc; | |
1068 | VEC_safe_push (call_sitep, chain, target_call_site); | |
1069 | break; | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | /* Backtrack (without revisiting the originating call_site). Try the | |
1074 | callers's sibling; if there isn't any try the callers's callers's | |
1075 | sibling etc. */ | |
1076 | ||
1077 | target_call_site = NULL; | |
1078 | while (!VEC_empty (call_sitep, chain)) | |
1079 | { | |
1080 | call_site = VEC_pop (call_sitep, chain); | |
1081 | ||
1082 | gdb_assert (htab_find_slot (addr_hash, &call_site->pc, | |
1083 | NO_INSERT) != NULL); | |
1084 | htab_remove_elt (addr_hash, &call_site->pc); | |
1085 | ||
1086 | target_call_site = call_site->tail_call_next; | |
1087 | if (target_call_site) | |
1088 | break; | |
1089 | } | |
1090 | } | |
1091 | while (target_call_site); | |
1092 | ||
1093 | if (VEC_empty (call_sitep, chain)) | |
1094 | call_site = NULL; | |
1095 | else | |
1096 | call_site = VEC_last (call_sitep, chain); | |
1097 | } | |
1098 | ||
1099 | if (retval == NULL) | |
1100 | { | |
7cbd4a93 | 1101 | struct bound_minimal_symbol msym_caller, msym_callee; |
111c6489 JK |
1102 | |
1103 | msym_caller = lookup_minimal_symbol_by_pc (caller_pc); | |
1104 | msym_callee = lookup_minimal_symbol_by_pc (callee_pc); | |
1105 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1106 | _("There are no unambiguously determinable intermediate " | |
1107 | "callers or callees between caller function \"%s\" at %s " | |
1108 | "and callee function \"%s\" at %s"), | |
7cbd4a93 | 1109 | (msym_caller.minsym == NULL |
efd66ac6 | 1110 | ? "???" : MSYMBOL_PRINT_NAME (msym_caller.minsym)), |
111c6489 | 1111 | paddress (gdbarch, caller_pc), |
7cbd4a93 | 1112 | (msym_callee.minsym == NULL |
efd66ac6 | 1113 | ? "???" : MSYMBOL_PRINT_NAME (msym_callee.minsym)), |
111c6489 JK |
1114 | paddress (gdbarch, callee_pc)); |
1115 | } | |
1116 | ||
1117 | do_cleanups (back_to_workdata); | |
1118 | discard_cleanups (back_to_retval); | |
1119 | return retval; | |
1120 | } | |
1121 | ||
1122 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1123 | assumed frames between them use GDBARCH. If valid call_site_chain cannot be | |
1124 | constructed return NULL. Caller is responsible for xfree of the returned | |
1125 | result. */ | |
1126 | ||
1127 | struct call_site_chain * | |
1128 | call_site_find_chain (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
1129 | CORE_ADDR callee_pc) | |
1130 | { | |
111c6489 JK |
1131 | struct call_site_chain *retval = NULL; |
1132 | ||
492d29ea | 1133 | TRY |
111c6489 JK |
1134 | { |
1135 | retval = call_site_find_chain_1 (gdbarch, caller_pc, callee_pc); | |
1136 | } | |
492d29ea | 1137 | CATCH (e, RETURN_MASK_ERROR) |
111c6489 JK |
1138 | { |
1139 | if (e.error == NO_ENTRY_VALUE_ERROR) | |
1140 | { | |
1141 | if (entry_values_debug) | |
1142 | exception_print (gdb_stdout, e); | |
1143 | ||
1144 | return NULL; | |
1145 | } | |
1146 | else | |
1147 | throw_exception (e); | |
1148 | } | |
492d29ea PA |
1149 | END_CATCH |
1150 | ||
111c6489 JK |
1151 | return retval; |
1152 | } | |
1153 | ||
24c5c679 JK |
1154 | /* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */ |
1155 | ||
1156 | static int | |
1157 | call_site_parameter_matches (struct call_site_parameter *parameter, | |
1158 | enum call_site_parameter_kind kind, | |
1159 | union call_site_parameter_u kind_u) | |
1160 | { | |
1161 | if (kind == parameter->kind) | |
1162 | switch (kind) | |
1163 | { | |
1164 | case CALL_SITE_PARAMETER_DWARF_REG: | |
1165 | return kind_u.dwarf_reg == parameter->u.dwarf_reg; | |
1166 | case CALL_SITE_PARAMETER_FB_OFFSET: | |
1167 | return kind_u.fb_offset == parameter->u.fb_offset; | |
1788b2d3 JK |
1168 | case CALL_SITE_PARAMETER_PARAM_OFFSET: |
1169 | return kind_u.param_offset.cu_off == parameter->u.param_offset.cu_off; | |
24c5c679 JK |
1170 | } |
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | /* Fetch call_site_parameter from caller matching KIND and KIND_U. | |
1175 | FRAME is for callee. | |
8e3b41a9 JK |
1176 | |
1177 | Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR | |
1178 | otherwise. */ | |
1179 | ||
1180 | static struct call_site_parameter * | |
24c5c679 JK |
1181 | dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, |
1182 | enum call_site_parameter_kind kind, | |
1183 | union call_site_parameter_u kind_u, | |
8e3b41a9 JK |
1184 | struct dwarf2_per_cu_data **per_cu_return) |
1185 | { | |
9e3a7d65 JK |
1186 | CORE_ADDR func_addr, caller_pc; |
1187 | struct gdbarch *gdbarch; | |
1188 | struct frame_info *caller_frame; | |
8e3b41a9 JK |
1189 | struct call_site *call_site; |
1190 | int iparams; | |
509f0fd9 JK |
1191 | /* Initialize it just to avoid a GCC false warning. */ |
1192 | struct call_site_parameter *parameter = NULL; | |
8e3b41a9 JK |
1193 | CORE_ADDR target_addr; |
1194 | ||
9e3a7d65 JK |
1195 | while (get_frame_type (frame) == INLINE_FRAME) |
1196 | { | |
1197 | frame = get_prev_frame (frame); | |
1198 | gdb_assert (frame != NULL); | |
1199 | } | |
1200 | ||
1201 | func_addr = get_frame_func (frame); | |
1202 | gdbarch = get_frame_arch (frame); | |
1203 | caller_frame = get_prev_frame (frame); | |
8e3b41a9 JK |
1204 | if (gdbarch != frame_unwind_arch (frame)) |
1205 | { | |
7cbd4a93 TT |
1206 | struct bound_minimal_symbol msym |
1207 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1208 | struct gdbarch *caller_gdbarch = frame_unwind_arch (frame); |
1209 | ||
1210 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1211 | _("DW_OP_GNU_entry_value resolving callee gdbarch %s " | |
1212 | "(of %s (%s)) does not match caller gdbarch %s"), | |
1213 | gdbarch_bfd_arch_info (gdbarch)->printable_name, | |
1214 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1215 | (msym.minsym == NULL ? "???" |
efd66ac6 | 1216 | : MSYMBOL_PRINT_NAME (msym.minsym)), |
8e3b41a9 JK |
1217 | gdbarch_bfd_arch_info (caller_gdbarch)->printable_name); |
1218 | } | |
1219 | ||
1220 | if (caller_frame == NULL) | |
1221 | { | |
7cbd4a93 TT |
1222 | struct bound_minimal_symbol msym |
1223 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1224 | |
1225 | throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_GNU_entry_value resolving " | |
1226 | "requires caller of %s (%s)"), | |
1227 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1228 | (msym.minsym == NULL ? "???" |
efd66ac6 | 1229 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
1230 | } |
1231 | caller_pc = get_frame_pc (caller_frame); | |
1232 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1233 | ||
1234 | target_addr = call_site_to_target_addr (gdbarch, call_site, caller_frame); | |
1235 | if (target_addr != func_addr) | |
1236 | { | |
1237 | struct minimal_symbol *target_msym, *func_msym; | |
1238 | ||
7cbd4a93 TT |
1239 | target_msym = lookup_minimal_symbol_by_pc (target_addr).minsym; |
1240 | func_msym = lookup_minimal_symbol_by_pc (func_addr).minsym; | |
8e3b41a9 JK |
1241 | throw_error (NO_ENTRY_VALUE_ERROR, |
1242 | _("DW_OP_GNU_entry_value resolving expects callee %s at %s " | |
1243 | "but the called frame is for %s at %s"), | |
1244 | (target_msym == NULL ? "???" | |
efd66ac6 | 1245 | : MSYMBOL_PRINT_NAME (target_msym)), |
8e3b41a9 | 1246 | paddress (gdbarch, target_addr), |
efd66ac6 | 1247 | func_msym == NULL ? "???" : MSYMBOL_PRINT_NAME (func_msym), |
8e3b41a9 JK |
1248 | paddress (gdbarch, func_addr)); |
1249 | } | |
1250 | ||
2d6c5dc2 JK |
1251 | /* No entry value based parameters would be reliable if this function can |
1252 | call itself via tail calls. */ | |
1253 | func_verify_no_selftailcall (gdbarch, func_addr); | |
1254 | ||
8e3b41a9 JK |
1255 | for (iparams = 0; iparams < call_site->parameter_count; iparams++) |
1256 | { | |
1257 | parameter = &call_site->parameter[iparams]; | |
24c5c679 | 1258 | if (call_site_parameter_matches (parameter, kind, kind_u)) |
8e3b41a9 JK |
1259 | break; |
1260 | } | |
1261 | if (iparams == call_site->parameter_count) | |
1262 | { | |
7cbd4a93 TT |
1263 | struct minimal_symbol *msym |
1264 | = lookup_minimal_symbol_by_pc (caller_pc).minsym; | |
8e3b41a9 JK |
1265 | |
1266 | /* DW_TAG_GNU_call_site_parameter will be missing just if GCC could not | |
1267 | determine its value. */ | |
1268 | throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot find matching parameter " | |
1269 | "at DW_TAG_GNU_call_site %s at %s"), | |
1270 | paddress (gdbarch, caller_pc), | |
efd66ac6 | 1271 | msym == NULL ? "???" : MSYMBOL_PRINT_NAME (msym)); |
8e3b41a9 JK |
1272 | } |
1273 | ||
1274 | *per_cu_return = call_site->per_cu; | |
1275 | return parameter; | |
1276 | } | |
1277 | ||
a471c594 JK |
1278 | /* Return value for PARAMETER matching DEREF_SIZE. If DEREF_SIZE is -1, return |
1279 | the normal DW_AT_GNU_call_site_value block. Otherwise return the | |
1280 | DW_AT_GNU_call_site_data_value (dereferenced) block. | |
e18b2753 JK |
1281 | |
1282 | TYPE and CALLER_FRAME specify how to evaluate the DWARF block into returned | |
1283 | struct value. | |
1284 | ||
1285 | Function always returns non-NULL, non-optimized out value. It throws | |
1286 | NO_ENTRY_VALUE_ERROR if it cannot resolve the value for any reason. */ | |
1287 | ||
1288 | static struct value * | |
1289 | dwarf_entry_parameter_to_value (struct call_site_parameter *parameter, | |
a471c594 | 1290 | CORE_ADDR deref_size, struct type *type, |
e18b2753 JK |
1291 | struct frame_info *caller_frame, |
1292 | struct dwarf2_per_cu_data *per_cu) | |
1293 | { | |
a471c594 | 1294 | const gdb_byte *data_src; |
e18b2753 | 1295 | gdb_byte *data; |
a471c594 JK |
1296 | size_t size; |
1297 | ||
1298 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
1299 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1300 | ||
1301 | /* DEREF_SIZE size is not verified here. */ | |
1302 | if (data_src == NULL) | |
1303 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1304 | _("Cannot resolve DW_AT_GNU_call_site_data_value")); | |
e18b2753 JK |
1305 | |
1306 | /* DW_AT_GNU_call_site_value is a DWARF expression, not a DWARF | |
1307 | location. Postprocessing of DWARF_VALUE_MEMORY would lose the type from | |
1308 | DWARF block. */ | |
224c3ddb | 1309 | data = (gdb_byte *) alloca (size + 1); |
a471c594 JK |
1310 | memcpy (data, data_src, size); |
1311 | data[size] = DW_OP_stack_value; | |
e18b2753 | 1312 | |
a471c594 | 1313 | return dwarf2_evaluate_loc_desc (type, caller_frame, data, size + 1, per_cu); |
e18b2753 JK |
1314 | } |
1315 | ||
a471c594 JK |
1316 | /* VALUE must be of type lval_computed with entry_data_value_funcs. Perform |
1317 | the indirect method on it, that is use its stored target value, the sole | |
1318 | purpose of entry_data_value_funcs.. */ | |
1319 | ||
1320 | static struct value * | |
1321 | entry_data_value_coerce_ref (const struct value *value) | |
1322 | { | |
1323 | struct type *checked_type = check_typedef (value_type (value)); | |
1324 | struct value *target_val; | |
1325 | ||
1326 | if (TYPE_CODE (checked_type) != TYPE_CODE_REF) | |
1327 | return NULL; | |
1328 | ||
9a3c8263 | 1329 | target_val = (struct value *) value_computed_closure (value); |
a471c594 JK |
1330 | value_incref (target_val); |
1331 | return target_val; | |
1332 | } | |
1333 | ||
1334 | /* Implement copy_closure. */ | |
1335 | ||
1336 | static void * | |
1337 | entry_data_value_copy_closure (const struct value *v) | |
1338 | { | |
9a3c8263 | 1339 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1340 | |
1341 | value_incref (target_val); | |
1342 | return target_val; | |
1343 | } | |
1344 | ||
1345 | /* Implement free_closure. */ | |
1346 | ||
1347 | static void | |
1348 | entry_data_value_free_closure (struct value *v) | |
1349 | { | |
9a3c8263 | 1350 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1351 | |
1352 | value_free (target_val); | |
1353 | } | |
1354 | ||
1355 | /* Vector for methods for an entry value reference where the referenced value | |
1356 | is stored in the caller. On the first dereference use | |
1357 | DW_AT_GNU_call_site_data_value in the caller. */ | |
1358 | ||
1359 | static const struct lval_funcs entry_data_value_funcs = | |
1360 | { | |
1361 | NULL, /* read */ | |
1362 | NULL, /* write */ | |
a471c594 JK |
1363 | NULL, /* indirect */ |
1364 | entry_data_value_coerce_ref, | |
1365 | NULL, /* check_synthetic_pointer */ | |
1366 | entry_data_value_copy_closure, | |
1367 | entry_data_value_free_closure | |
1368 | }; | |
1369 | ||
24c5c679 JK |
1370 | /* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U |
1371 | are used to match DW_AT_location at the caller's | |
1372 | DW_TAG_GNU_call_site_parameter. | |
e18b2753 JK |
1373 | |
1374 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1375 | cannot resolve the parameter for any reason. */ | |
1376 | ||
1377 | static struct value * | |
1378 | value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame, | |
24c5c679 JK |
1379 | enum call_site_parameter_kind kind, |
1380 | union call_site_parameter_u kind_u) | |
e18b2753 | 1381 | { |
a471c594 JK |
1382 | struct type *checked_type = check_typedef (type); |
1383 | struct type *target_type = TYPE_TARGET_TYPE (checked_type); | |
e18b2753 | 1384 | struct frame_info *caller_frame = get_prev_frame (frame); |
a471c594 | 1385 | struct value *outer_val, *target_val, *val; |
e18b2753 JK |
1386 | struct call_site_parameter *parameter; |
1387 | struct dwarf2_per_cu_data *caller_per_cu; | |
1388 | ||
24c5c679 | 1389 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
e18b2753 JK |
1390 | &caller_per_cu); |
1391 | ||
a471c594 JK |
1392 | outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */, |
1393 | type, caller_frame, | |
1394 | caller_per_cu); | |
1395 | ||
1396 | /* Check if DW_AT_GNU_call_site_data_value cannot be used. If it should be | |
1397 | used and it is not available do not fall back to OUTER_VAL - dereferencing | |
1398 | TYPE_CODE_REF with non-entry data value would give current value - not the | |
1399 | entry value. */ | |
1400 | ||
1401 | if (TYPE_CODE (checked_type) != TYPE_CODE_REF | |
1402 | || TYPE_TARGET_TYPE (checked_type) == NULL) | |
1403 | return outer_val; | |
1404 | ||
1405 | target_val = dwarf_entry_parameter_to_value (parameter, | |
1406 | TYPE_LENGTH (target_type), | |
1407 | target_type, caller_frame, | |
1408 | caller_per_cu); | |
1409 | ||
a471c594 JK |
1410 | release_value (target_val); |
1411 | val = allocate_computed_value (type, &entry_data_value_funcs, | |
1412 | target_val /* closure */); | |
1413 | ||
1414 | /* Copy the referencing pointer to the new computed value. */ | |
1415 | memcpy (value_contents_raw (val), value_contents_raw (outer_val), | |
1416 | TYPE_LENGTH (checked_type)); | |
1417 | set_value_lazy (val, 0); | |
1418 | ||
1419 | return val; | |
e18b2753 JK |
1420 | } |
1421 | ||
1422 | /* Read parameter of TYPE at (callee) FRAME's function entry. DATA and | |
1423 | SIZE are DWARF block used to match DW_AT_location at the caller's | |
1424 | DW_TAG_GNU_call_site_parameter. | |
1425 | ||
1426 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1427 | cannot resolve the parameter for any reason. */ | |
1428 | ||
1429 | static struct value * | |
1430 | value_of_dwarf_block_entry (struct type *type, struct frame_info *frame, | |
1431 | const gdb_byte *block, size_t block_len) | |
1432 | { | |
24c5c679 | 1433 | union call_site_parameter_u kind_u; |
e18b2753 | 1434 | |
24c5c679 JK |
1435 | kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len); |
1436 | if (kind_u.dwarf_reg != -1) | |
1437 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG, | |
1438 | kind_u); | |
e18b2753 | 1439 | |
24c5c679 JK |
1440 | if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset)) |
1441 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET, | |
1442 | kind_u); | |
e18b2753 JK |
1443 | |
1444 | /* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message | |
1445 | suppressed during normal operation. The expression can be arbitrary if | |
1446 | there is no caller-callee entry value binding expected. */ | |
1447 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1448 | _("DWARF-2 expression error: DW_OP_GNU_entry_value is supported " | |
1449 | "only for single DW_OP_reg* or for DW_OP_fbreg(*)")); | |
1450 | } | |
1451 | ||
052b9502 NF |
1452 | struct piece_closure |
1453 | { | |
88bfdde4 TT |
1454 | /* Reference count. */ |
1455 | int refc; | |
1456 | ||
8cf6f0b1 TT |
1457 | /* The CU from which this closure's expression came. */ |
1458 | struct dwarf2_per_cu_data *per_cu; | |
1459 | ||
052b9502 NF |
1460 | /* The number of pieces used to describe this variable. */ |
1461 | int n_pieces; | |
1462 | ||
6063c216 UW |
1463 | /* The target address size, used only for DWARF_VALUE_STACK. */ |
1464 | int addr_size; | |
cec03d70 | 1465 | |
052b9502 NF |
1466 | /* The pieces themselves. */ |
1467 | struct dwarf_expr_piece *pieces; | |
ee40d8d4 YQ |
1468 | |
1469 | /* Frame ID of frame to which a register value is relative, used | |
1470 | only by DWARF_VALUE_REGISTER. */ | |
1471 | struct frame_id frame_id; | |
052b9502 NF |
1472 | }; |
1473 | ||
1474 | /* Allocate a closure for a value formed from separately-described | |
1475 | PIECES. */ | |
1476 | ||
1477 | static struct piece_closure * | |
8cf6f0b1 TT |
1478 | allocate_piece_closure (struct dwarf2_per_cu_data *per_cu, |
1479 | int n_pieces, struct dwarf_expr_piece *pieces, | |
ee40d8d4 | 1480 | int addr_size, struct frame_info *frame) |
052b9502 | 1481 | { |
41bf6aca | 1482 | struct piece_closure *c = XCNEW (struct piece_closure); |
8a9b8146 | 1483 | int i; |
052b9502 | 1484 | |
88bfdde4 | 1485 | c->refc = 1; |
8cf6f0b1 | 1486 | c->per_cu = per_cu; |
052b9502 | 1487 | c->n_pieces = n_pieces; |
6063c216 | 1488 | c->addr_size = addr_size; |
fc270c35 | 1489 | c->pieces = XCNEWVEC (struct dwarf_expr_piece, n_pieces); |
ee40d8d4 YQ |
1490 | if (frame == NULL) |
1491 | c->frame_id = null_frame_id; | |
1492 | else | |
1493 | c->frame_id = get_frame_id (frame); | |
052b9502 NF |
1494 | |
1495 | memcpy (c->pieces, pieces, n_pieces * sizeof (struct dwarf_expr_piece)); | |
8a9b8146 TT |
1496 | for (i = 0; i < n_pieces; ++i) |
1497 | if (c->pieces[i].location == DWARF_VALUE_STACK) | |
1498 | value_incref (c->pieces[i].v.value); | |
052b9502 NF |
1499 | |
1500 | return c; | |
1501 | } | |
1502 | ||
22347e55 AA |
1503 | /* Copy NBITS bits from SOURCE to DEST starting at the given bit |
1504 | offsets. Use the bit order as specified by BITS_BIG_ENDIAN. | |
1505 | Source and destination buffers must not overlap. */ | |
d3b1e874 TT |
1506 | |
1507 | static void | |
22347e55 AA |
1508 | copy_bitwise (gdb_byte *dest, ULONGEST dest_offset, |
1509 | const gdb_byte *source, ULONGEST source_offset, | |
1510 | ULONGEST nbits, int bits_big_endian) | |
d3b1e874 | 1511 | { |
22347e55 | 1512 | unsigned int buf, avail; |
d3b1e874 | 1513 | |
22347e55 AA |
1514 | if (nbits == 0) |
1515 | return; | |
d3b1e874 | 1516 | |
d3b1e874 TT |
1517 | if (bits_big_endian) |
1518 | { | |
22347e55 AA |
1519 | /* Start from the end, then work backwards. */ |
1520 | dest_offset += nbits - 1; | |
1521 | dest += dest_offset / 8; | |
1522 | dest_offset = 7 - dest_offset % 8; | |
1523 | source_offset += nbits - 1; | |
1524 | source += source_offset / 8; | |
1525 | source_offset = 7 - source_offset % 8; | |
d3b1e874 TT |
1526 | } |
1527 | else | |
1528 | { | |
22347e55 AA |
1529 | dest += dest_offset / 8; |
1530 | dest_offset %= 8; | |
1531 | source += source_offset / 8; | |
1532 | source_offset %= 8; | |
d3b1e874 TT |
1533 | } |
1534 | ||
22347e55 AA |
1535 | /* Fill BUF with DEST_OFFSET bits from the destination and 8 - |
1536 | SOURCE_OFFSET bits from the source. */ | |
1537 | buf = *(bits_big_endian ? source-- : source++) >> source_offset; | |
1538 | buf <<= dest_offset; | |
1539 | buf |= *dest & ((1 << dest_offset) - 1); | |
d3b1e874 | 1540 | |
22347e55 AA |
1541 | /* NBITS: bits yet to be written; AVAIL: BUF's fill level. */ |
1542 | nbits += dest_offset; | |
1543 | avail = dest_offset + 8 - source_offset; | |
d3b1e874 | 1544 | |
22347e55 AA |
1545 | /* Flush 8 bits from BUF, if appropriate. */ |
1546 | if (nbits >= 8 && avail >= 8) | |
d3b1e874 | 1547 | { |
22347e55 AA |
1548 | *(bits_big_endian ? dest-- : dest++) = buf; |
1549 | buf >>= 8; | |
1550 | avail -= 8; | |
1551 | nbits -= 8; | |
d3b1e874 TT |
1552 | } |
1553 | ||
22347e55 AA |
1554 | /* Copy the middle part. */ |
1555 | if (nbits >= 8) | |
d3b1e874 | 1556 | { |
22347e55 AA |
1557 | size_t len = nbits / 8; |
1558 | ||
793c128d AA |
1559 | /* Use a faster method for byte-aligned copies. */ |
1560 | if (avail == 0) | |
22347e55 | 1561 | { |
793c128d AA |
1562 | if (bits_big_endian) |
1563 | { | |
1564 | dest -= len; | |
1565 | source -= len; | |
1566 | memcpy (dest + 1, source + 1, len); | |
1567 | } | |
1568 | else | |
1569 | { | |
1570 | memcpy (dest, source, len); | |
1571 | dest += len; | |
1572 | source += len; | |
1573 | } | |
1574 | } | |
1575 | else | |
1576 | { | |
1577 | while (len--) | |
1578 | { | |
1579 | buf |= *(bits_big_endian ? source-- : source++) << avail; | |
1580 | *(bits_big_endian ? dest-- : dest++) = buf; | |
1581 | buf >>= 8; | |
1582 | } | |
22347e55 AA |
1583 | } |
1584 | nbits %= 8; | |
d3b1e874 TT |
1585 | } |
1586 | ||
22347e55 AA |
1587 | /* Write the last byte. */ |
1588 | if (nbits) | |
d3b1e874 | 1589 | { |
22347e55 AA |
1590 | if (avail < nbits) |
1591 | buf |= *source << avail; | |
1592 | ||
1593 | buf &= (1 << nbits) - 1; | |
1594 | *dest = (*dest & (~0 << nbits)) | buf; | |
d3b1e874 TT |
1595 | } |
1596 | } | |
1597 | ||
ad06383f AA |
1598 | #if GDB_SELF_TEST |
1599 | ||
1600 | namespace selftests { | |
1601 | ||
1602 | /* Helper function for the unit test of copy_bitwise. Convert NBITS bits | |
1603 | out of BITS, starting at OFFS, to the respective '0'/'1'-string. MSB0 | |
1604 | specifies whether to assume big endian bit numbering. Store the | |
1605 | resulting (not null-terminated) string at STR. */ | |
1606 | ||
1607 | static void | |
1608 | bits_to_str (char *str, const gdb_byte *bits, ULONGEST offs, | |
1609 | ULONGEST nbits, int msb0) | |
1610 | { | |
1611 | unsigned int j; | |
1612 | size_t i; | |
1613 | ||
1614 | for (i = offs / 8, j = offs % 8; nbits; i++, j = 0) | |
1615 | { | |
1616 | unsigned int ch = bits[i]; | |
1617 | for (; j < 8 && nbits; j++, nbits--) | |
1618 | *str++ = (ch & (msb0 ? (1 << (7 - j)) : (1 << j))) ? '1' : '0'; | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | /* Check one invocation of copy_bitwise with the given parameters. */ | |
1623 | ||
1624 | static void | |
1625 | check_copy_bitwise (const gdb_byte *dest, unsigned int dest_offset, | |
1626 | const gdb_byte *source, unsigned int source_offset, | |
1627 | unsigned int nbits, int msb0) | |
1628 | { | |
1629 | size_t len = align_up (dest_offset + nbits, 8); | |
1630 | char *expected = (char *) alloca (len + 1); | |
1631 | char *actual = (char *) alloca (len + 1); | |
1632 | gdb_byte *buf = (gdb_byte *) alloca (len / 8); | |
1633 | ||
1634 | /* Compose a '0'/'1'-string that represents the expected result of | |
1635 | copy_bitwise below: | |
1636 | Bits from [0, DEST_OFFSET) are filled from DEST. | |
1637 | Bits from [DEST_OFFSET, DEST_OFFSET + NBITS) are filled from SOURCE. | |
1638 | Bits from [DEST_OFFSET + NBITS, LEN) are filled from DEST. | |
1639 | ||
1640 | E.g., with: | |
1641 | dest_offset: 4 | |
1642 | nbits: 2 | |
1643 | len: 8 | |
1644 | dest: 00000000 | |
1645 | source: 11111111 | |
1646 | ||
1647 | We should end up with: | |
1648 | buf: 00001100 | |
1649 | DDDDSSDD (D=dest, S=source) | |
1650 | */ | |
1651 | bits_to_str (expected, dest, 0, len, msb0); | |
1652 | bits_to_str (expected + dest_offset, source, source_offset, nbits, msb0); | |
1653 | ||
1654 | /* Fill BUF with data from DEST, apply copy_bitwise, and convert the | |
1655 | result to a '0'/'1'-string. */ | |
1656 | memcpy (buf, dest, len / 8); | |
1657 | copy_bitwise (buf, dest_offset, source, source_offset, nbits, msb0); | |
1658 | bits_to_str (actual, buf, 0, len, msb0); | |
1659 | ||
1660 | /* Compare the resulting strings. */ | |
1661 | expected[len] = actual[len] = '\0'; | |
1662 | if (strcmp (expected, actual) != 0) | |
1663 | error (_("copy_bitwise %s != %s (%u+%u -> %u)"), | |
1664 | expected, actual, source_offset, nbits, dest_offset); | |
1665 | } | |
1666 | ||
1667 | /* Unit test for copy_bitwise. */ | |
1668 | ||
1669 | static void | |
1670 | copy_bitwise_tests (void) | |
1671 | { | |
1672 | /* Data to be used as both source and destination buffers. The two | |
1673 | arrays below represent the lsb0- and msb0- encoded versions of the | |
1674 | following bit string, respectively: | |
1675 | 00000000 00011111 11111111 01001000 10100101 11110010 | |
1676 | This pattern is chosen such that it contains: | |
1677 | - constant 0- and 1- chunks of more than a full byte; | |
1678 | - 0/1- and 1/0 transitions on all bit positions within a byte; | |
1679 | - several sufficiently asymmetric bytes. | |
1680 | */ | |
1681 | static const gdb_byte data_lsb0[] = { | |
1682 | 0x00, 0xf8, 0xff, 0x12, 0xa5, 0x4f | |
1683 | }; | |
1684 | static const gdb_byte data_msb0[] = { | |
1685 | 0x00, 0x1f, 0xff, 0x48, 0xa5, 0xf2 | |
1686 | }; | |
1687 | ||
1688 | constexpr size_t data_nbits = 8 * sizeof (data_lsb0); | |
1689 | constexpr unsigned max_nbits = 24; | |
1690 | ||
1691 | /* Try all combinations of: | |
1692 | lsb0/msb0 bit order (using the respective data array) | |
1693 | X [0, MAX_NBITS] copy bit width | |
1694 | X feasible source offsets for the given copy bit width | |
1695 | X feasible destination offsets | |
1696 | */ | |
1697 | for (int msb0 = 0; msb0 < 2; msb0++) | |
1698 | { | |
1699 | const gdb_byte *data = msb0 ? data_msb0 : data_lsb0; | |
1700 | ||
1701 | for (unsigned int nbits = 1; nbits <= max_nbits; nbits++) | |
1702 | { | |
1703 | const unsigned int max_offset = data_nbits - nbits; | |
1704 | ||
1705 | for (unsigned source_offset = 0; | |
1706 | source_offset <= max_offset; | |
1707 | source_offset++) | |
1708 | { | |
1709 | for (unsigned dest_offset = 0; | |
1710 | dest_offset <= max_offset; | |
1711 | dest_offset++) | |
1712 | { | |
1713 | check_copy_bitwise (data + dest_offset / 8, | |
1714 | dest_offset % 8, | |
1715 | data + source_offset / 8, | |
1716 | source_offset % 8, | |
1717 | nbits, msb0); | |
1718 | } | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | /* Special cases: copy all, copy nothing. */ | |
1723 | check_copy_bitwise (data_lsb0, 0, data_msb0, 0, data_nbits, msb0); | |
1724 | check_copy_bitwise (data_msb0, 0, data_lsb0, 0, data_nbits, msb0); | |
1725 | check_copy_bitwise (data, data_nbits - 7, data, 9, 0, msb0); | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | } /* namespace selftests */ | |
1730 | ||
1731 | #endif /* GDB_SELF_TEST */ | |
1732 | ||
052b9502 NF |
1733 | static void |
1734 | read_pieced_value (struct value *v) | |
1735 | { | |
1736 | int i; | |
1737 | long offset = 0; | |
d3b1e874 | 1738 | ULONGEST bits_to_skip; |
052b9502 | 1739 | gdb_byte *contents; |
3e43a32a MS |
1740 | struct piece_closure *c |
1741 | = (struct piece_closure *) value_computed_closure (v); | |
afd74c5f | 1742 | size_t type_len; |
d3b1e874 | 1743 | size_t buffer_size = 0; |
58414334 | 1744 | std::vector<gdb_byte> buffer; |
d3b1e874 TT |
1745 | int bits_big_endian |
1746 | = gdbarch_bits_big_endian (get_type_arch (value_type (v))); | |
afd74c5f TT |
1747 | |
1748 | if (value_type (v) != value_enclosing_type (v)) | |
1749 | internal_error (__FILE__, __LINE__, | |
1750 | _("Should not be able to create a lazy value with " | |
1751 | "an enclosing type")); | |
052b9502 NF |
1752 | |
1753 | contents = value_contents_raw (v); | |
d3b1e874 | 1754 | bits_to_skip = 8 * value_offset (v); |
0e03807e TT |
1755 | if (value_bitsize (v)) |
1756 | { | |
1757 | bits_to_skip += value_bitpos (v); | |
1758 | type_len = value_bitsize (v); | |
1759 | } | |
1760 | else | |
1761 | type_len = 8 * TYPE_LENGTH (value_type (v)); | |
d3b1e874 | 1762 | |
afd74c5f | 1763 | for (i = 0; i < c->n_pieces && offset < type_len; i++) |
052b9502 NF |
1764 | { |
1765 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
d3b1e874 TT |
1766 | size_t this_size, this_size_bits; |
1767 | long dest_offset_bits, source_offset_bits, source_offset; | |
0d45f56e | 1768 | const gdb_byte *intermediate_buffer; |
d3b1e874 TT |
1769 | |
1770 | /* Compute size, source, and destination offsets for copying, in | |
1771 | bits. */ | |
1772 | this_size_bits = p->size; | |
1773 | if (bits_to_skip > 0 && bits_to_skip >= this_size_bits) | |
afd74c5f | 1774 | { |
d3b1e874 | 1775 | bits_to_skip -= this_size_bits; |
afd74c5f TT |
1776 | continue; |
1777 | } | |
d3b1e874 | 1778 | if (bits_to_skip > 0) |
afd74c5f | 1779 | { |
d3b1e874 TT |
1780 | dest_offset_bits = 0; |
1781 | source_offset_bits = bits_to_skip; | |
1782 | this_size_bits -= bits_to_skip; | |
1783 | bits_to_skip = 0; | |
afd74c5f TT |
1784 | } |
1785 | else | |
1786 | { | |
d3b1e874 TT |
1787 | dest_offset_bits = offset; |
1788 | source_offset_bits = 0; | |
afd74c5f | 1789 | } |
5bd1ef56 TT |
1790 | if (this_size_bits > type_len - offset) |
1791 | this_size_bits = type_len - offset; | |
9a619af0 | 1792 | |
d3b1e874 TT |
1793 | this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8; |
1794 | source_offset = source_offset_bits / 8; | |
1795 | if (buffer_size < this_size) | |
1796 | { | |
1797 | buffer_size = this_size; | |
58414334 | 1798 | buffer.reserve (buffer_size); |
d3b1e874 | 1799 | } |
58414334 | 1800 | intermediate_buffer = buffer.data (); |
d3b1e874 TT |
1801 | |
1802 | /* Copy from the source to DEST_BUFFER. */ | |
cec03d70 | 1803 | switch (p->location) |
052b9502 | 1804 | { |
cec03d70 TT |
1805 | case DWARF_VALUE_REGISTER: |
1806 | { | |
ee40d8d4 | 1807 | struct frame_info *frame = frame_find_by_id (c->frame_id); |
cec03d70 | 1808 | struct gdbarch *arch = get_frame_arch (frame); |
0fde2c53 DE |
1809 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno); |
1810 | int optim, unavail; | |
6b850546 | 1811 | LONGEST reg_offset = source_offset; |
dcbf108f | 1812 | |
0fde2c53 DE |
1813 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG |
1814 | && this_size < register_size (arch, gdb_regnum)) | |
63b4f126 | 1815 | { |
0fde2c53 DE |
1816 | /* Big-endian, and we want less than full size. */ |
1817 | reg_offset = register_size (arch, gdb_regnum) - this_size; | |
1818 | /* We want the lower-order THIS_SIZE_BITS of the bytes | |
1819 | we extract from the register. */ | |
1820 | source_offset_bits += 8 * this_size - this_size_bits; | |
63b4f126 | 1821 | } |
0fde2c53 DE |
1822 | |
1823 | if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset, | |
58414334 | 1824 | this_size, buffer.data (), |
0fde2c53 | 1825 | &optim, &unavail)) |
63b4f126 | 1826 | { |
0fde2c53 | 1827 | /* Just so garbage doesn't ever shine through. */ |
58414334 | 1828 | memset (buffer.data (), 0, this_size); |
0fde2c53 DE |
1829 | |
1830 | if (optim) | |
1831 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1832 | if (unavail) | |
1833 | mark_value_bits_unavailable (v, offset, this_size_bits); | |
63b4f126 | 1834 | } |
cec03d70 TT |
1835 | } |
1836 | break; | |
1837 | ||
1838 | case DWARF_VALUE_MEMORY: | |
e6ca34fc PA |
1839 | read_value_memory (v, offset, |
1840 | p->v.mem.in_stack_memory, | |
1841 | p->v.mem.addr + source_offset, | |
58414334 | 1842 | buffer.data (), this_size); |
cec03d70 TT |
1843 | break; |
1844 | ||
1845 | case DWARF_VALUE_STACK: | |
1846 | { | |
afd74c5f | 1847 | size_t n = this_size; |
9a619af0 | 1848 | |
afd74c5f TT |
1849 | if (n > c->addr_size - source_offset) |
1850 | n = (c->addr_size >= source_offset | |
1851 | ? c->addr_size - source_offset | |
1852 | : 0); | |
1853 | if (n == 0) | |
1854 | { | |
1855 | /* Nothing. */ | |
1856 | } | |
afd74c5f TT |
1857 | else |
1858 | { | |
8a9b8146 | 1859 | const gdb_byte *val_bytes = value_contents_all (p->v.value); |
afd74c5f | 1860 | |
8a9b8146 | 1861 | intermediate_buffer = val_bytes + source_offset; |
afd74c5f | 1862 | } |
cec03d70 TT |
1863 | } |
1864 | break; | |
1865 | ||
1866 | case DWARF_VALUE_LITERAL: | |
1867 | { | |
afd74c5f TT |
1868 | size_t n = this_size; |
1869 | ||
1870 | if (n > p->v.literal.length - source_offset) | |
1871 | n = (p->v.literal.length >= source_offset | |
1872 | ? p->v.literal.length - source_offset | |
1873 | : 0); | |
1874 | if (n != 0) | |
d3b1e874 | 1875 | intermediate_buffer = p->v.literal.data + source_offset; |
cec03d70 TT |
1876 | } |
1877 | break; | |
1878 | ||
8cf6f0b1 TT |
1879 | /* These bits show up as zeros -- but do not cause the value |
1880 | to be considered optimized-out. */ | |
1881 | case DWARF_VALUE_IMPLICIT_POINTER: | |
1882 | break; | |
1883 | ||
cb826367 | 1884 | case DWARF_VALUE_OPTIMIZED_OUT: |
9a0dc9e3 | 1885 | mark_value_bits_optimized_out (v, offset, this_size_bits); |
cb826367 TT |
1886 | break; |
1887 | ||
cec03d70 TT |
1888 | default: |
1889 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
052b9502 | 1890 | } |
d3b1e874 | 1891 | |
8cf6f0b1 TT |
1892 | if (p->location != DWARF_VALUE_OPTIMIZED_OUT |
1893 | && p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
d3b1e874 TT |
1894 | copy_bitwise (contents, dest_offset_bits, |
1895 | intermediate_buffer, source_offset_bits % 8, | |
1896 | this_size_bits, bits_big_endian); | |
1897 | ||
1898 | offset += this_size_bits; | |
052b9502 NF |
1899 | } |
1900 | } | |
1901 | ||
1902 | static void | |
1903 | write_pieced_value (struct value *to, struct value *from) | |
1904 | { | |
1905 | int i; | |
1906 | long offset = 0; | |
d3b1e874 | 1907 | ULONGEST bits_to_skip; |
afd74c5f | 1908 | const gdb_byte *contents; |
3e43a32a MS |
1909 | struct piece_closure *c |
1910 | = (struct piece_closure *) value_computed_closure (to); | |
41b56feb | 1911 | struct frame_info *frame; |
afd74c5f | 1912 | size_t type_len; |
d3b1e874 | 1913 | size_t buffer_size = 0; |
58414334 | 1914 | std::vector<gdb_byte> buffer; |
d3b1e874 TT |
1915 | int bits_big_endian |
1916 | = gdbarch_bits_big_endian (get_type_arch (value_type (to))); | |
052b9502 | 1917 | |
41b56feb KB |
1918 | /* VALUE_FRAME_ID is used instead of VALUE_NEXT_FRAME_ID here |
1919 | because FRAME is passed to get_frame_register_bytes() and | |
1920 | put_frame_register_bytes(), both of which do their own "->next" | |
1921 | operations. */ | |
1922 | frame = frame_find_by_id (VALUE_FRAME_ID (to)); | |
052b9502 NF |
1923 | if (frame == NULL) |
1924 | { | |
9a0dc9e3 | 1925 | mark_value_bytes_optimized_out (to, 0, TYPE_LENGTH (value_type (to))); |
052b9502 NF |
1926 | return; |
1927 | } | |
1928 | ||
afd74c5f | 1929 | contents = value_contents (from); |
d3b1e874 | 1930 | bits_to_skip = 8 * value_offset (to); |
0e03807e TT |
1931 | if (value_bitsize (to)) |
1932 | { | |
1933 | bits_to_skip += value_bitpos (to); | |
1934 | type_len = value_bitsize (to); | |
1935 | } | |
1936 | else | |
1937 | type_len = 8 * TYPE_LENGTH (value_type (to)); | |
1938 | ||
afd74c5f | 1939 | for (i = 0; i < c->n_pieces && offset < type_len; i++) |
052b9502 NF |
1940 | { |
1941 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
d3b1e874 TT |
1942 | size_t this_size_bits, this_size; |
1943 | long dest_offset_bits, source_offset_bits, dest_offset, source_offset; | |
1944 | int need_bitwise; | |
1945 | const gdb_byte *source_buffer; | |
afd74c5f | 1946 | |
d3b1e874 TT |
1947 | this_size_bits = p->size; |
1948 | if (bits_to_skip > 0 && bits_to_skip >= this_size_bits) | |
afd74c5f | 1949 | { |
d3b1e874 | 1950 | bits_to_skip -= this_size_bits; |
afd74c5f TT |
1951 | continue; |
1952 | } | |
d3b1e874 TT |
1953 | if (this_size_bits > type_len - offset) |
1954 | this_size_bits = type_len - offset; | |
1955 | if (bits_to_skip > 0) | |
afd74c5f | 1956 | { |
d3b1e874 TT |
1957 | dest_offset_bits = bits_to_skip; |
1958 | source_offset_bits = 0; | |
1959 | this_size_bits -= bits_to_skip; | |
1960 | bits_to_skip = 0; | |
afd74c5f TT |
1961 | } |
1962 | else | |
1963 | { | |
d3b1e874 TT |
1964 | dest_offset_bits = 0; |
1965 | source_offset_bits = offset; | |
1966 | } | |
1967 | ||
1968 | this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8; | |
1969 | source_offset = source_offset_bits / 8; | |
1970 | dest_offset = dest_offset_bits / 8; | |
1971 | if (dest_offset_bits % 8 == 0 && source_offset_bits % 8 == 0) | |
1972 | { | |
1973 | source_buffer = contents + source_offset; | |
1974 | need_bitwise = 0; | |
1975 | } | |
1976 | else | |
1977 | { | |
1978 | if (buffer_size < this_size) | |
1979 | { | |
1980 | buffer_size = this_size; | |
58414334 | 1981 | buffer.reserve (buffer_size); |
d3b1e874 | 1982 | } |
58414334 | 1983 | source_buffer = buffer.data (); |
d3b1e874 | 1984 | need_bitwise = 1; |
afd74c5f | 1985 | } |
9a619af0 | 1986 | |
cec03d70 | 1987 | switch (p->location) |
052b9502 | 1988 | { |
cec03d70 TT |
1989 | case DWARF_VALUE_REGISTER: |
1990 | { | |
1991 | struct gdbarch *arch = get_frame_arch (frame); | |
0fde2c53 DE |
1992 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno); |
1993 | int reg_offset = dest_offset; | |
dcbf108f | 1994 | |
0fde2c53 DE |
1995 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG |
1996 | && this_size <= register_size (arch, gdb_regnum)) | |
63b4f126 | 1997 | { |
0fde2c53 DE |
1998 | /* Big-endian, and we want less than full size. */ |
1999 | reg_offset = register_size (arch, gdb_regnum) - this_size; | |
2000 | } | |
ca45ab26 | 2001 | |
0fde2c53 DE |
2002 | if (need_bitwise) |
2003 | { | |
2004 | int optim, unavail; | |
ca45ab26 | 2005 | |
0fde2c53 | 2006 | if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset, |
58414334 | 2007 | this_size, buffer.data (), |
0fde2c53 | 2008 | &optim, &unavail)) |
d3b1e874 | 2009 | { |
0fde2c53 DE |
2010 | if (optim) |
2011 | throw_error (OPTIMIZED_OUT_ERROR, | |
2012 | _("Can't do read-modify-write to " | |
2013 | "update bitfield; containing word " | |
2014 | "has been optimized out")); | |
2015 | if (unavail) | |
2016 | throw_error (NOT_AVAILABLE_ERROR, | |
2017 | _("Can't do read-modify-write to update " | |
2018 | "bitfield; containing word " | |
2019 | "is unavailable")); | |
d3b1e874 | 2020 | } |
58414334 | 2021 | copy_bitwise (buffer.data (), dest_offset_bits, |
0fde2c53 DE |
2022 | contents, source_offset_bits, |
2023 | this_size_bits, | |
2024 | bits_big_endian); | |
63b4f126 | 2025 | } |
0fde2c53 DE |
2026 | |
2027 | put_frame_register_bytes (frame, gdb_regnum, reg_offset, | |
2028 | this_size, source_buffer); | |
cec03d70 TT |
2029 | } |
2030 | break; | |
2031 | case DWARF_VALUE_MEMORY: | |
d3b1e874 TT |
2032 | if (need_bitwise) |
2033 | { | |
2034 | /* Only the first and last bytes can possibly have any | |
2035 | bits reused. */ | |
58414334 | 2036 | read_memory (p->v.mem.addr + dest_offset, buffer.data (), 1); |
f2c7657e | 2037 | read_memory (p->v.mem.addr + dest_offset + this_size - 1, |
58414334 TT |
2038 | &buffer[this_size - 1], 1); |
2039 | copy_bitwise (buffer.data (), dest_offset_bits, | |
d3b1e874 TT |
2040 | contents, source_offset_bits, |
2041 | this_size_bits, | |
2042 | bits_big_endian); | |
2043 | } | |
2044 | ||
f2c7657e | 2045 | write_memory (p->v.mem.addr + dest_offset, |
d3b1e874 | 2046 | source_buffer, this_size); |
cec03d70 TT |
2047 | break; |
2048 | default: | |
9a0dc9e3 | 2049 | mark_value_bytes_optimized_out (to, 0, TYPE_LENGTH (value_type (to))); |
0e03807e | 2050 | break; |
052b9502 | 2051 | } |
d3b1e874 | 2052 | offset += this_size_bits; |
052b9502 NF |
2053 | } |
2054 | } | |
2055 | ||
9a0dc9e3 PA |
2056 | /* An implementation of an lval_funcs method to see whether a value is |
2057 | a synthetic pointer. */ | |
8cf6f0b1 | 2058 | |
0e03807e | 2059 | static int |
6b850546 | 2060 | check_pieced_synthetic_pointer (const struct value *value, LONGEST bit_offset, |
9a0dc9e3 | 2061 | int bit_length) |
0e03807e TT |
2062 | { |
2063 | struct piece_closure *c | |
2064 | = (struct piece_closure *) value_computed_closure (value); | |
2065 | int i; | |
2066 | ||
2067 | bit_offset += 8 * value_offset (value); | |
2068 | if (value_bitsize (value)) | |
2069 | bit_offset += value_bitpos (value); | |
2070 | ||
2071 | for (i = 0; i < c->n_pieces && bit_length > 0; i++) | |
2072 | { | |
2073 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2074 | size_t this_size_bits = p->size; | |
2075 | ||
2076 | if (bit_offset > 0) | |
2077 | { | |
2078 | if (bit_offset >= this_size_bits) | |
2079 | { | |
2080 | bit_offset -= this_size_bits; | |
2081 | continue; | |
2082 | } | |
2083 | ||
2084 | bit_length -= this_size_bits - bit_offset; | |
2085 | bit_offset = 0; | |
2086 | } | |
2087 | else | |
2088 | bit_length -= this_size_bits; | |
2089 | ||
9a0dc9e3 PA |
2090 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) |
2091 | return 0; | |
0e03807e TT |
2092 | } |
2093 | ||
9a0dc9e3 | 2094 | return 1; |
8cf6f0b1 TT |
2095 | } |
2096 | ||
2097 | /* A wrapper function for get_frame_address_in_block. */ | |
2098 | ||
2099 | static CORE_ADDR | |
2100 | get_frame_address_in_block_wrapper (void *baton) | |
2101 | { | |
9a3c8263 | 2102 | return get_frame_address_in_block ((struct frame_info *) baton); |
8cf6f0b1 TT |
2103 | } |
2104 | ||
3326303b MG |
2105 | /* Fetch a DW_AT_const_value through a synthetic pointer. */ |
2106 | ||
2107 | static struct value * | |
2108 | fetch_const_value_from_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
2109 | struct dwarf2_per_cu_data *per_cu, | |
2110 | struct type *type) | |
2111 | { | |
2112 | struct value *result = NULL; | |
2113 | struct obstack temp_obstack; | |
2114 | struct cleanup *cleanup; | |
2115 | const gdb_byte *bytes; | |
2116 | LONGEST len; | |
2117 | ||
2118 | obstack_init (&temp_obstack); | |
2119 | cleanup = make_cleanup_obstack_free (&temp_obstack); | |
2120 | bytes = dwarf2_fetch_constant_bytes (die, per_cu, &temp_obstack, &len); | |
2121 | ||
2122 | if (bytes != NULL) | |
2123 | { | |
2124 | if (byte_offset >= 0 | |
2125 | && byte_offset + TYPE_LENGTH (TYPE_TARGET_TYPE (type)) <= len) | |
2126 | { | |
2127 | bytes += byte_offset; | |
2128 | result = value_from_contents (TYPE_TARGET_TYPE (type), bytes); | |
2129 | } | |
2130 | else | |
2131 | invalid_synthetic_pointer (); | |
2132 | } | |
2133 | else | |
2134 | result = allocate_optimized_out_value (TYPE_TARGET_TYPE (type)); | |
2135 | ||
2136 | do_cleanups (cleanup); | |
2137 | ||
2138 | return result; | |
2139 | } | |
2140 | ||
2141 | /* Fetch the value pointed to by a synthetic pointer. */ | |
2142 | ||
2143 | static struct value * | |
2144 | indirect_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
2145 | struct dwarf2_per_cu_data *per_cu, | |
2146 | struct frame_info *frame, struct type *type) | |
2147 | { | |
2148 | /* Fetch the location expression of the DIE we're pointing to. */ | |
2149 | struct dwarf2_locexpr_baton baton | |
2150 | = dwarf2_fetch_die_loc_sect_off (die, per_cu, | |
2151 | get_frame_address_in_block_wrapper, frame); | |
2152 | ||
2153 | /* If pointed-to DIE has a DW_AT_location, evaluate it and return the | |
2154 | resulting value. Otherwise, it may have a DW_AT_const_value instead, | |
2155 | or it may've been optimized out. */ | |
2156 | if (baton.data != NULL) | |
2157 | return dwarf2_evaluate_loc_desc_full (TYPE_TARGET_TYPE (type), frame, | |
2158 | baton.data, baton.size, baton.per_cu, | |
2159 | byte_offset); | |
2160 | else | |
2161 | return fetch_const_value_from_synthetic_pointer (die, byte_offset, per_cu, | |
2162 | type); | |
2163 | } | |
2164 | ||
8cf6f0b1 TT |
2165 | /* An implementation of an lval_funcs method to indirect through a |
2166 | pointer. This handles the synthetic pointer case when needed. */ | |
2167 | ||
2168 | static struct value * | |
2169 | indirect_pieced_value (struct value *value) | |
2170 | { | |
2171 | struct piece_closure *c | |
2172 | = (struct piece_closure *) value_computed_closure (value); | |
2173 | struct type *type; | |
2174 | struct frame_info *frame; | |
2175 | struct dwarf2_locexpr_baton baton; | |
6b850546 DT |
2176 | int i, bit_length; |
2177 | LONGEST bit_offset; | |
8cf6f0b1 | 2178 | struct dwarf_expr_piece *piece = NULL; |
8cf6f0b1 | 2179 | LONGEST byte_offset; |
b597c318 | 2180 | enum bfd_endian byte_order; |
8cf6f0b1 | 2181 | |
0e37a63c | 2182 | type = check_typedef (value_type (value)); |
8cf6f0b1 TT |
2183 | if (TYPE_CODE (type) != TYPE_CODE_PTR) |
2184 | return NULL; | |
2185 | ||
2186 | bit_length = 8 * TYPE_LENGTH (type); | |
2187 | bit_offset = 8 * value_offset (value); | |
2188 | if (value_bitsize (value)) | |
2189 | bit_offset += value_bitpos (value); | |
2190 | ||
2191 | for (i = 0; i < c->n_pieces && bit_length > 0; i++) | |
2192 | { | |
2193 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2194 | size_t this_size_bits = p->size; | |
2195 | ||
2196 | if (bit_offset > 0) | |
2197 | { | |
2198 | if (bit_offset >= this_size_bits) | |
2199 | { | |
2200 | bit_offset -= this_size_bits; | |
2201 | continue; | |
2202 | } | |
2203 | ||
2204 | bit_length -= this_size_bits - bit_offset; | |
2205 | bit_offset = 0; | |
2206 | } | |
2207 | else | |
2208 | bit_length -= this_size_bits; | |
2209 | ||
2210 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
2211 | return NULL; | |
2212 | ||
2213 | if (bit_length != 0) | |
2214 | error (_("Invalid use of DW_OP_GNU_implicit_pointer")); | |
2215 | ||
2216 | piece = p; | |
2217 | break; | |
2218 | } | |
2219 | ||
3326303b | 2220 | gdb_assert (piece != NULL); |
8cf6f0b1 | 2221 | frame = get_selected_frame (_("No frame selected.")); |
543305c9 | 2222 | |
5bd1ef56 TT |
2223 | /* This is an offset requested by GDB, such as value subscripts. |
2224 | However, due to how synthetic pointers are implemented, this is | |
2225 | always presented to us as a pointer type. This means we have to | |
b597c318 YQ |
2226 | sign-extend it manually as appropriate. Use raw |
2227 | extract_signed_integer directly rather than value_as_address and | |
2228 | sign extend afterwards on architectures that would need it | |
2229 | (mostly everywhere except MIPS, which has signed addresses) as | |
2230 | the later would go through gdbarch_pointer_to_address and thus | |
2231 | return a CORE_ADDR with high bits set on architectures that | |
2232 | encode address spaces and other things in CORE_ADDR. */ | |
2233 | byte_order = gdbarch_byte_order (get_frame_arch (frame)); | |
2234 | byte_offset = extract_signed_integer (value_contents (value), | |
2235 | TYPE_LENGTH (type), byte_order); | |
5bd1ef56 | 2236 | byte_offset += piece->v.ptr.offset; |
8cf6f0b1 | 2237 | |
3326303b MG |
2238 | return indirect_synthetic_pointer (piece->v.ptr.die, byte_offset, c->per_cu, |
2239 | frame, type); | |
2240 | } | |
8cf6f0b1 | 2241 | |
3326303b MG |
2242 | /* Implementation of the coerce_ref method of lval_funcs for synthetic C++ |
2243 | references. */ | |
b6807d98 | 2244 | |
3326303b MG |
2245 | static struct value * |
2246 | coerce_pieced_ref (const struct value *value) | |
2247 | { | |
2248 | struct type *type = check_typedef (value_type (value)); | |
b6807d98 | 2249 | |
3326303b MG |
2250 | if (value_bits_synthetic_pointer (value, value_embedded_offset (value), |
2251 | TARGET_CHAR_BIT * TYPE_LENGTH (type))) | |
2252 | { | |
2253 | const struct piece_closure *closure | |
2254 | = (struct piece_closure *) value_computed_closure (value); | |
2255 | struct frame_info *frame | |
2256 | = get_selected_frame (_("No frame selected.")); | |
2257 | ||
2258 | /* gdb represents synthetic pointers as pieced values with a single | |
2259 | piece. */ | |
2260 | gdb_assert (closure != NULL); | |
2261 | gdb_assert (closure->n_pieces == 1); | |
2262 | ||
2263 | return indirect_synthetic_pointer (closure->pieces->v.ptr.die, | |
2264 | closure->pieces->v.ptr.offset, | |
2265 | closure->per_cu, frame, type); | |
2266 | } | |
2267 | else | |
2268 | { | |
2269 | /* Else: not a synthetic reference; do nothing. */ | |
2270 | return NULL; | |
2271 | } | |
0e03807e TT |
2272 | } |
2273 | ||
052b9502 | 2274 | static void * |
0e03807e | 2275 | copy_pieced_value_closure (const struct value *v) |
052b9502 | 2276 | { |
3e43a32a MS |
2277 | struct piece_closure *c |
2278 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2279 | |
88bfdde4 TT |
2280 | ++c->refc; |
2281 | return c; | |
052b9502 NF |
2282 | } |
2283 | ||
2284 | static void | |
2285 | free_pieced_value_closure (struct value *v) | |
2286 | { | |
3e43a32a MS |
2287 | struct piece_closure *c |
2288 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2289 | |
88bfdde4 TT |
2290 | --c->refc; |
2291 | if (c->refc == 0) | |
2292 | { | |
8a9b8146 TT |
2293 | int i; |
2294 | ||
2295 | for (i = 0; i < c->n_pieces; ++i) | |
2296 | if (c->pieces[i].location == DWARF_VALUE_STACK) | |
2297 | value_free (c->pieces[i].v.value); | |
2298 | ||
88bfdde4 TT |
2299 | xfree (c->pieces); |
2300 | xfree (c); | |
2301 | } | |
052b9502 NF |
2302 | } |
2303 | ||
2304 | /* Functions for accessing a variable described by DW_OP_piece. */ | |
c8f2448a | 2305 | static const struct lval_funcs pieced_value_funcs = { |
052b9502 NF |
2306 | read_pieced_value, |
2307 | write_pieced_value, | |
8cf6f0b1 | 2308 | indirect_pieced_value, |
3326303b | 2309 | coerce_pieced_ref, |
8cf6f0b1 | 2310 | check_pieced_synthetic_pointer, |
052b9502 NF |
2311 | copy_pieced_value_closure, |
2312 | free_pieced_value_closure | |
2313 | }; | |
2314 | ||
4c2df51b | 2315 | /* Evaluate a location description, starting at DATA and with length |
8cf6f0b1 TT |
2316 | SIZE, to find the current location of variable of TYPE in the |
2317 | context of FRAME. BYTE_OFFSET is applied after the contents are | |
2318 | computed. */ | |
a2d33775 | 2319 | |
8cf6f0b1 TT |
2320 | static struct value * |
2321 | dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame, | |
56eb65bd | 2322 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2323 | struct dwarf2_per_cu_data *per_cu, |
2324 | LONGEST byte_offset) | |
4c2df51b | 2325 | { |
4c2df51b | 2326 | struct value *retval; |
718b9626 | 2327 | struct cleanup *value_chain; |
ac56253d | 2328 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b | 2329 | |
8cf6f0b1 TT |
2330 | if (byte_offset < 0) |
2331 | invalid_synthetic_pointer (); | |
2332 | ||
0d53c4c4 | 2333 | if (size == 0) |
a7035dbb | 2334 | return allocate_optimized_out_value (type); |
0d53c4c4 | 2335 | |
192ca6d8 TT |
2336 | dwarf_evaluate_loc_desc ctx; |
2337 | ctx.frame = frame; | |
2338 | ctx.per_cu = per_cu; | |
2339 | ctx.obj_address = 0; | |
4c2df51b | 2340 | |
72fc29ff | 2341 | value_chain = make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 2342 | |
718b9626 TT |
2343 | ctx.gdbarch = get_objfile_arch (objfile); |
2344 | ctx.addr_size = dwarf2_per_cu_addr_size (per_cu); | |
2345 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); | |
2346 | ctx.offset = dwarf2_per_cu_text_offset (per_cu); | |
4c2df51b | 2347 | |
492d29ea | 2348 | TRY |
79e1a869 | 2349 | { |
595d2e30 | 2350 | ctx.eval (data, size); |
79e1a869 | 2351 | } |
492d29ea | 2352 | CATCH (ex, RETURN_MASK_ERROR) |
79e1a869 PA |
2353 | { |
2354 | if (ex.error == NOT_AVAILABLE_ERROR) | |
2355 | { | |
718b9626 | 2356 | do_cleanups (value_chain); |
79e1a869 PA |
2357 | retval = allocate_value (type); |
2358 | mark_value_bytes_unavailable (retval, 0, TYPE_LENGTH (type)); | |
2359 | return retval; | |
2360 | } | |
8e3b41a9 JK |
2361 | else if (ex.error == NO_ENTRY_VALUE_ERROR) |
2362 | { | |
2363 | if (entry_values_debug) | |
2364 | exception_print (gdb_stdout, ex); | |
718b9626 | 2365 | do_cleanups (value_chain); |
8e3b41a9 JK |
2366 | return allocate_optimized_out_value (type); |
2367 | } | |
79e1a869 PA |
2368 | else |
2369 | throw_exception (ex); | |
2370 | } | |
492d29ea | 2371 | END_CATCH |
79e1a869 | 2372 | |
718b9626 | 2373 | if (ctx.num_pieces > 0) |
87808bd6 | 2374 | { |
052b9502 | 2375 | struct piece_closure *c; |
8cf6f0b1 TT |
2376 | ULONGEST bit_size = 0; |
2377 | int i; | |
052b9502 | 2378 | |
718b9626 TT |
2379 | for (i = 0; i < ctx.num_pieces; ++i) |
2380 | bit_size += ctx.pieces[i].size; | |
8cf6f0b1 TT |
2381 | if (8 * (byte_offset + TYPE_LENGTH (type)) > bit_size) |
2382 | invalid_synthetic_pointer (); | |
2383 | ||
718b9626 | 2384 | c = allocate_piece_closure (per_cu, ctx.num_pieces, ctx.pieces, |
ee40d8d4 | 2385 | ctx.addr_size, frame); |
72fc29ff TT |
2386 | /* We must clean up the value chain after creating the piece |
2387 | closure but before allocating the result. */ | |
2388 | do_cleanups (value_chain); | |
a2d33775 | 2389 | retval = allocate_computed_value (type, &pieced_value_funcs, c); |
8cf6f0b1 | 2390 | set_value_offset (retval, byte_offset); |
87808bd6 | 2391 | } |
4c2df51b DJ |
2392 | else |
2393 | { | |
718b9626 | 2394 | switch (ctx.location) |
cec03d70 TT |
2395 | { |
2396 | case DWARF_VALUE_REGISTER: | |
2397 | { | |
2398 | struct gdbarch *arch = get_frame_arch (frame); | |
7c33b57c | 2399 | int dwarf_regnum |
595d2e30 | 2400 | = longest_to_int (value_as_long (ctx.fetch (0))); |
0fde2c53 | 2401 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, dwarf_regnum); |
9a619af0 | 2402 | |
8cf6f0b1 TT |
2403 | if (byte_offset != 0) |
2404 | error (_("cannot use offset on synthetic pointer to register")); | |
72fc29ff | 2405 | do_cleanups (value_chain); |
0fde2c53 DE |
2406 | retval = value_from_register (type, gdb_regnum, frame); |
2407 | if (value_optimized_out (retval)) | |
2408 | { | |
2409 | struct value *tmp; | |
2410 | ||
2411 | /* This means the register has undefined value / was | |
2412 | not saved. As we're computing the location of some | |
2413 | variable etc. in the program, not a value for | |
2414 | inspecting a register ($pc, $sp, etc.), return a | |
2415 | generic optimized out value instead, so that we show | |
2416 | <optimized out> instead of <not saved>. */ | |
2417 | do_cleanups (value_chain); | |
2418 | tmp = allocate_value (type); | |
2419 | value_contents_copy (tmp, 0, retval, 0, TYPE_LENGTH (type)); | |
2420 | retval = tmp; | |
2421 | } | |
cec03d70 TT |
2422 | } |
2423 | break; | |
2424 | ||
2425 | case DWARF_VALUE_MEMORY: | |
2426 | { | |
f56331b4 | 2427 | struct type *ptr_type; |
595d2e30 TT |
2428 | CORE_ADDR address = ctx.fetch_address (0); |
2429 | int in_stack_memory = ctx.fetch_in_stack_memory (0); | |
cec03d70 | 2430 | |
f56331b4 KB |
2431 | /* DW_OP_deref_size (and possibly other operations too) may |
2432 | create a pointer instead of an address. Ideally, the | |
2433 | pointer to address conversion would be performed as part | |
2434 | of those operations, but the type of the object to | |
2435 | which the address refers is not known at the time of | |
2436 | the operation. Therefore, we do the conversion here | |
2437 | since the type is readily available. */ | |
2438 | ||
2439 | switch (TYPE_CODE (type)) | |
2440 | { | |
2441 | case TYPE_CODE_FUNC: | |
2442 | case TYPE_CODE_METHOD: | |
718b9626 | 2443 | ptr_type = builtin_type (ctx.gdbarch)->builtin_func_ptr; |
f56331b4 KB |
2444 | break; |
2445 | default: | |
718b9626 | 2446 | ptr_type = builtin_type (ctx.gdbarch)->builtin_data_ptr; |
f56331b4 KB |
2447 | break; |
2448 | } | |
2449 | address = value_as_address (value_from_pointer (ptr_type, address)); | |
2450 | ||
72fc29ff | 2451 | do_cleanups (value_chain); |
08039c9e | 2452 | retval = value_at_lazy (type, address + byte_offset); |
44353522 DE |
2453 | if (in_stack_memory) |
2454 | set_value_stack (retval, 1); | |
cec03d70 TT |
2455 | } |
2456 | break; | |
2457 | ||
2458 | case DWARF_VALUE_STACK: | |
2459 | { | |
595d2e30 | 2460 | struct value *value = ctx.fetch (0); |
8a9b8146 TT |
2461 | gdb_byte *contents; |
2462 | const gdb_byte *val_bytes; | |
2463 | size_t n = TYPE_LENGTH (value_type (value)); | |
cec03d70 | 2464 | |
8cf6f0b1 TT |
2465 | if (byte_offset + TYPE_LENGTH (type) > n) |
2466 | invalid_synthetic_pointer (); | |
2467 | ||
8a9b8146 TT |
2468 | val_bytes = value_contents_all (value); |
2469 | val_bytes += byte_offset; | |
8cf6f0b1 TT |
2470 | n -= byte_offset; |
2471 | ||
72fc29ff TT |
2472 | /* Preserve VALUE because we are going to free values back |
2473 | to the mark, but we still need the value contents | |
2474 | below. */ | |
2475 | value_incref (value); | |
2476 | do_cleanups (value_chain); | |
2477 | make_cleanup_value_free (value); | |
2478 | ||
a2d33775 | 2479 | retval = allocate_value (type); |
cec03d70 | 2480 | contents = value_contents_raw (retval); |
a2d33775 | 2481 | if (n > TYPE_LENGTH (type)) |
b6cede78 JK |
2482 | { |
2483 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
2484 | ||
2485 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2486 | val_bytes += n - TYPE_LENGTH (type); | |
2487 | n = TYPE_LENGTH (type); | |
2488 | } | |
8a9b8146 | 2489 | memcpy (contents, val_bytes, n); |
cec03d70 TT |
2490 | } |
2491 | break; | |
2492 | ||
2493 | case DWARF_VALUE_LITERAL: | |
2494 | { | |
2495 | bfd_byte *contents; | |
8c814cdd | 2496 | const bfd_byte *ldata; |
718b9626 | 2497 | size_t n = ctx.len; |
cec03d70 | 2498 | |
8cf6f0b1 TT |
2499 | if (byte_offset + TYPE_LENGTH (type) > n) |
2500 | invalid_synthetic_pointer (); | |
2501 | ||
72fc29ff | 2502 | do_cleanups (value_chain); |
a2d33775 | 2503 | retval = allocate_value (type); |
cec03d70 | 2504 | contents = value_contents_raw (retval); |
8cf6f0b1 | 2505 | |
718b9626 | 2506 | ldata = ctx.data + byte_offset; |
8cf6f0b1 TT |
2507 | n -= byte_offset; |
2508 | ||
a2d33775 | 2509 | if (n > TYPE_LENGTH (type)) |
b6cede78 JK |
2510 | { |
2511 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
2512 | ||
2513 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2514 | ldata += n - TYPE_LENGTH (type); | |
2515 | n = TYPE_LENGTH (type); | |
2516 | } | |
8c814cdd | 2517 | memcpy (contents, ldata, n); |
cec03d70 TT |
2518 | } |
2519 | break; | |
2520 | ||
dd90784c | 2521 | case DWARF_VALUE_OPTIMIZED_OUT: |
72fc29ff | 2522 | do_cleanups (value_chain); |
a7035dbb | 2523 | retval = allocate_optimized_out_value (type); |
dd90784c JK |
2524 | break; |
2525 | ||
8cf6f0b1 TT |
2526 | /* DWARF_VALUE_IMPLICIT_POINTER was converted to a pieced |
2527 | operation by execute_stack_op. */ | |
2528 | case DWARF_VALUE_IMPLICIT_POINTER: | |
cb826367 TT |
2529 | /* DWARF_VALUE_OPTIMIZED_OUT can't occur in this context -- |
2530 | it can only be encountered when making a piece. */ | |
cec03d70 TT |
2531 | default: |
2532 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
2533 | } | |
4c2df51b DJ |
2534 | } |
2535 | ||
718b9626 | 2536 | set_value_initialized (retval, ctx.initialized); |
42be36b3 | 2537 | |
718b9626 | 2538 | do_cleanups (value_chain); |
4c2df51b DJ |
2539 | |
2540 | return retval; | |
2541 | } | |
8cf6f0b1 TT |
2542 | |
2543 | /* The exported interface to dwarf2_evaluate_loc_desc_full; it always | |
2544 | passes 0 as the byte_offset. */ | |
2545 | ||
2546 | struct value * | |
2547 | dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame, | |
56eb65bd | 2548 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2549 | struct dwarf2_per_cu_data *per_cu) |
2550 | { | |
2551 | return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, 0); | |
2552 | } | |
2553 | ||
80180f79 | 2554 | /* Evaluates a dwarf expression and stores the result in VAL, expecting |
63e43d3a PMR |
2555 | that the dwarf expression only produces a single CORE_ADDR. FRAME is the |
2556 | frame in which the expression is evaluated. ADDR is a context (location of | |
2557 | a variable) and might be needed to evaluate the location expression. | |
80180f79 SA |
2558 | Returns 1 on success, 0 otherwise. */ |
2559 | ||
2560 | static int | |
2561 | dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton, | |
63e43d3a | 2562 | struct frame_info *frame, |
08412b07 | 2563 | CORE_ADDR addr, |
1cfdf534 | 2564 | CORE_ADDR *valp) |
80180f79 | 2565 | { |
80180f79 SA |
2566 | struct objfile *objfile; |
2567 | struct cleanup *cleanup; | |
2568 | ||
2569 | if (dlbaton == NULL || dlbaton->size == 0) | |
2570 | return 0; | |
2571 | ||
192ca6d8 | 2572 | dwarf_evaluate_loc_desc ctx; |
80180f79 | 2573 | |
192ca6d8 TT |
2574 | ctx.frame = frame; |
2575 | ctx.per_cu = dlbaton->per_cu; | |
2576 | ctx.obj_address = addr; | |
80180f79 SA |
2577 | |
2578 | objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); | |
2579 | ||
718b9626 TT |
2580 | ctx.gdbarch = get_objfile_arch (objfile); |
2581 | ctx.addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
2582 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (dlbaton->per_cu); | |
2583 | ctx.offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); | |
80180f79 | 2584 | |
595d2e30 | 2585 | ctx.eval (dlbaton->data, dlbaton->size); |
80180f79 | 2586 | |
718b9626 | 2587 | switch (ctx.location) |
80180f79 SA |
2588 | { |
2589 | case DWARF_VALUE_REGISTER: | |
2590 | case DWARF_VALUE_MEMORY: | |
2591 | case DWARF_VALUE_STACK: | |
595d2e30 | 2592 | *valp = ctx.fetch_address (0); |
718b9626 | 2593 | if (ctx.location == DWARF_VALUE_REGISTER) |
192ca6d8 | 2594 | *valp = ctx.read_addr_from_reg (*valp); |
80180f79 SA |
2595 | return 1; |
2596 | case DWARF_VALUE_LITERAL: | |
718b9626 TT |
2597 | *valp = extract_signed_integer (ctx.data, ctx.len, |
2598 | gdbarch_byte_order (ctx.gdbarch)); | |
80180f79 SA |
2599 | return 1; |
2600 | /* Unsupported dwarf values. */ | |
2601 | case DWARF_VALUE_OPTIMIZED_OUT: | |
2602 | case DWARF_VALUE_IMPLICIT_POINTER: | |
2603 | break; | |
2604 | } | |
2605 | ||
80180f79 SA |
2606 | return 0; |
2607 | } | |
2608 | ||
2609 | /* See dwarf2loc.h. */ | |
2610 | ||
2611 | int | |
08412b07 | 2612 | dwarf2_evaluate_property (const struct dynamic_prop *prop, |
63e43d3a | 2613 | struct frame_info *frame, |
df25ebbd JB |
2614 | struct property_addr_info *addr_stack, |
2615 | CORE_ADDR *value) | |
80180f79 SA |
2616 | { |
2617 | if (prop == NULL) | |
2618 | return 0; | |
2619 | ||
63e43d3a PMR |
2620 | if (frame == NULL && has_stack_frames ()) |
2621 | frame = get_selected_frame (NULL); | |
2622 | ||
80180f79 SA |
2623 | switch (prop->kind) |
2624 | { | |
2625 | case PROP_LOCEXPR: | |
2626 | { | |
9a3c8263 SM |
2627 | const struct dwarf2_property_baton *baton |
2628 | = (const struct dwarf2_property_baton *) prop->data.baton; | |
80180f79 | 2629 | |
63e43d3a PMR |
2630 | if (dwarf2_locexpr_baton_eval (&baton->locexpr, frame, |
2631 | addr_stack ? addr_stack->addr : 0, | |
df25ebbd | 2632 | value)) |
80180f79 SA |
2633 | { |
2634 | if (baton->referenced_type) | |
2635 | { | |
2636 | struct value *val = value_at (baton->referenced_type, *value); | |
2637 | ||
2638 | *value = value_as_address (val); | |
2639 | } | |
2640 | return 1; | |
2641 | } | |
2642 | } | |
2643 | break; | |
2644 | ||
2645 | case PROP_LOCLIST: | |
2646 | { | |
9a3c8263 SM |
2647 | struct dwarf2_property_baton *baton |
2648 | = (struct dwarf2_property_baton *) prop->data.baton; | |
80180f79 SA |
2649 | CORE_ADDR pc = get_frame_address_in_block (frame); |
2650 | const gdb_byte *data; | |
2651 | struct value *val; | |
2652 | size_t size; | |
2653 | ||
2654 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2655 | if (data != NULL) | |
2656 | { | |
2657 | val = dwarf2_evaluate_loc_desc (baton->referenced_type, frame, data, | |
2658 | size, baton->loclist.per_cu); | |
2659 | if (!value_optimized_out (val)) | |
2660 | { | |
2661 | *value = value_as_address (val); | |
2662 | return 1; | |
2663 | } | |
2664 | } | |
2665 | } | |
2666 | break; | |
2667 | ||
2668 | case PROP_CONST: | |
2669 | *value = prop->data.const_val; | |
2670 | return 1; | |
df25ebbd JB |
2671 | |
2672 | case PROP_ADDR_OFFSET: | |
2673 | { | |
9a3c8263 SM |
2674 | struct dwarf2_property_baton *baton |
2675 | = (struct dwarf2_property_baton *) prop->data.baton; | |
df25ebbd JB |
2676 | struct property_addr_info *pinfo; |
2677 | struct value *val; | |
2678 | ||
2679 | for (pinfo = addr_stack; pinfo != NULL; pinfo = pinfo->next) | |
2680 | if (pinfo->type == baton->referenced_type) | |
2681 | break; | |
2682 | if (pinfo == NULL) | |
2c811c0f | 2683 | error (_("cannot find reference address for offset property")); |
c3345124 JB |
2684 | if (pinfo->valaddr != NULL) |
2685 | val = value_from_contents | |
2686 | (baton->offset_info.type, | |
2687 | pinfo->valaddr + baton->offset_info.offset); | |
2688 | else | |
2689 | val = value_at (baton->offset_info.type, | |
2690 | pinfo->addr + baton->offset_info.offset); | |
df25ebbd JB |
2691 | *value = value_as_address (val); |
2692 | return 1; | |
2693 | } | |
80180f79 SA |
2694 | } |
2695 | ||
2696 | return 0; | |
2697 | } | |
2698 | ||
bb2ec1b3 TT |
2699 | /* See dwarf2loc.h. */ |
2700 | ||
2701 | void | |
2702 | dwarf2_compile_property_to_c (struct ui_file *stream, | |
2703 | const char *result_name, | |
2704 | struct gdbarch *gdbarch, | |
2705 | unsigned char *registers_used, | |
2706 | const struct dynamic_prop *prop, | |
2707 | CORE_ADDR pc, | |
2708 | struct symbol *sym) | |
2709 | { | |
9a3c8263 SM |
2710 | struct dwarf2_property_baton *baton |
2711 | = (struct dwarf2_property_baton *) prop->data.baton; | |
bb2ec1b3 TT |
2712 | const gdb_byte *data; |
2713 | size_t size; | |
2714 | struct dwarf2_per_cu_data *per_cu; | |
2715 | ||
2716 | if (prop->kind == PROP_LOCEXPR) | |
2717 | { | |
2718 | data = baton->locexpr.data; | |
2719 | size = baton->locexpr.size; | |
2720 | per_cu = baton->locexpr.per_cu; | |
2721 | } | |
2722 | else | |
2723 | { | |
2724 | gdb_assert (prop->kind == PROP_LOCLIST); | |
2725 | ||
2726 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2727 | per_cu = baton->loclist.per_cu; | |
2728 | } | |
2729 | ||
2730 | compile_dwarf_bounds_to_c (stream, result_name, prop, sym, pc, | |
2731 | gdbarch, registers_used, | |
2732 | dwarf2_per_cu_addr_size (per_cu), | |
2733 | data, data + size, per_cu); | |
2734 | } | |
2735 | ||
4c2df51b | 2736 | \f |
0b31a4bc | 2737 | /* Helper functions and baton for dwarf2_loc_desc_get_symbol_read_needs. */ |
4c2df51b | 2738 | |
192ca6d8 | 2739 | class symbol_needs_eval_context : public dwarf_expr_context |
4c2df51b | 2740 | { |
192ca6d8 TT |
2741 | public: |
2742 | ||
0b31a4bc | 2743 | enum symbol_needs_kind needs; |
17ea53c3 | 2744 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b | 2745 | |
192ca6d8 TT |
2746 | /* Reads from registers do require a frame. */ |
2747 | CORE_ADDR read_addr_from_reg (int regnum) OVERRIDE | |
2748 | { | |
2749 | needs = SYMBOL_NEEDS_FRAME; | |
2750 | return 1; | |
2751 | } | |
2752 | ||
2753 | /* "get_reg_value" callback: Reads from registers do require a | |
2754 | frame. */ | |
2755 | ||
2756 | struct value *get_reg_value (struct type *type, int regnum) OVERRIDE | |
2757 | { | |
2758 | needs = SYMBOL_NEEDS_FRAME; | |
2759 | return value_zero (type, not_lval); | |
2760 | } | |
2761 | ||
2762 | /* Reads from memory do not require a frame. */ | |
2763 | void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE | |
2764 | { | |
2765 | memset (buf, 0, len); | |
2766 | } | |
2767 | ||
2768 | /* Frame-relative accesses do require a frame. */ | |
2769 | void get_frame_base (const gdb_byte **start, size_t *length) OVERRIDE | |
2770 | { | |
2771 | static gdb_byte lit0 = DW_OP_lit0; | |
2772 | ||
2773 | *start = &lit0; | |
2774 | *length = 1; | |
2775 | ||
2776 | needs = SYMBOL_NEEDS_FRAME; | |
2777 | } | |
2778 | ||
2779 | /* CFA accesses require a frame. */ | |
2780 | CORE_ADDR get_frame_cfa () OVERRIDE | |
2781 | { | |
2782 | needs = SYMBOL_NEEDS_FRAME; | |
2783 | return 1; | |
2784 | } | |
2785 | ||
7d5697f9 TT |
2786 | CORE_ADDR get_frame_pc () OVERRIDE |
2787 | { | |
2788 | needs = SYMBOL_NEEDS_FRAME; | |
2789 | return 1; | |
2790 | } | |
2791 | ||
192ca6d8 TT |
2792 | /* Thread-local accesses require registers, but not a frame. */ |
2793 | CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE | |
2794 | { | |
2795 | if (needs <= SYMBOL_NEEDS_REGISTERS) | |
2796 | needs = SYMBOL_NEEDS_REGISTERS; | |
2797 | return 1; | |
2798 | } | |
2799 | ||
2800 | /* Helper interface of per_cu_dwarf_call for | |
2801 | dwarf2_loc_desc_get_symbol_read_needs. */ | |
2802 | ||
2803 | void dwarf_call (cu_offset die_offset) OVERRIDE | |
2804 | { | |
2805 | per_cu_dwarf_call (this, die_offset, per_cu); | |
2806 | } | |
2807 | ||
2808 | /* DW_OP_GNU_entry_value accesses require a caller, therefore a | |
2809 | frame. */ | |
2810 | ||
2811 | void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, | |
2812 | union call_site_parameter_u kind_u, | |
2813 | int deref_size) OVERRIDE | |
2814 | { | |
2815 | needs = SYMBOL_NEEDS_FRAME; | |
3019eac3 | 2816 | |
192ca6d8 TT |
2817 | /* The expression may require some stub values on DWARF stack. */ |
2818 | push_address (0, 0); | |
2819 | } | |
3019eac3 | 2820 | |
192ca6d8 | 2821 | /* DW_OP_GNU_addr_index doesn't require a frame. */ |
08412b07 | 2822 | |
192ca6d8 TT |
2823 | CORE_ADDR get_addr_index (unsigned int index) OVERRIDE |
2824 | { | |
2825 | /* Nothing to do. */ | |
2826 | return 1; | |
2827 | } | |
08412b07 | 2828 | |
192ca6d8 | 2829 | /* DW_OP_push_object_address has a frame already passed through. */ |
9e8b7a03 | 2830 | |
192ca6d8 TT |
2831 | CORE_ADDR get_object_address () OVERRIDE |
2832 | { | |
2833 | /* Nothing to do. */ | |
2834 | return 1; | |
2835 | } | |
9e8b7a03 JK |
2836 | }; |
2837 | ||
0b31a4bc TT |
2838 | /* Compute the correct symbol_needs_kind value for the location |
2839 | expression at DATA (length SIZE). */ | |
4c2df51b | 2840 | |
0b31a4bc TT |
2841 | static enum symbol_needs_kind |
2842 | dwarf2_loc_desc_get_symbol_read_needs (const gdb_byte *data, size_t size, | |
2843 | struct dwarf2_per_cu_data *per_cu) | |
4c2df51b | 2844 | { |
f630a401 | 2845 | int in_reg; |
4a227398 | 2846 | struct cleanup *old_chain; |
ac56253d | 2847 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b | 2848 | |
192ca6d8 TT |
2849 | symbol_needs_eval_context ctx; |
2850 | ||
2851 | ctx.needs = SYMBOL_NEEDS_NONE; | |
2852 | ctx.per_cu = per_cu; | |
4c2df51b | 2853 | |
718b9626 | 2854 | old_chain = make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 2855 | |
718b9626 TT |
2856 | ctx.gdbarch = get_objfile_arch (objfile); |
2857 | ctx.addr_size = dwarf2_per_cu_addr_size (per_cu); | |
2858 | ctx.ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); | |
2859 | ctx.offset = dwarf2_per_cu_text_offset (per_cu); | |
4c2df51b | 2860 | |
595d2e30 | 2861 | ctx.eval (data, size); |
4c2df51b | 2862 | |
718b9626 | 2863 | in_reg = ctx.location == DWARF_VALUE_REGISTER; |
f630a401 | 2864 | |
718b9626 | 2865 | if (ctx.num_pieces > 0) |
87808bd6 JB |
2866 | { |
2867 | int i; | |
2868 | ||
2869 | /* If the location has several pieces, and any of them are in | |
2870 | registers, then we will need a frame to fetch them from. */ | |
718b9626 TT |
2871 | for (i = 0; i < ctx.num_pieces; i++) |
2872 | if (ctx.pieces[i].location == DWARF_VALUE_REGISTER) | |
87808bd6 JB |
2873 | in_reg = 1; |
2874 | } | |
2875 | ||
4a227398 | 2876 | do_cleanups (old_chain); |
4c2df51b | 2877 | |
0b31a4bc | 2878 | if (in_reg) |
192ca6d8 TT |
2879 | ctx.needs = SYMBOL_NEEDS_FRAME; |
2880 | return ctx.needs; | |
4c2df51b DJ |
2881 | } |
2882 | ||
3cf03773 TT |
2883 | /* A helper function that throws an unimplemented error mentioning a |
2884 | given DWARF operator. */ | |
2885 | ||
2886 | static void | |
2887 | unimplemented (unsigned int op) | |
0d53c4c4 | 2888 | { |
f39c6ffd | 2889 | const char *name = get_DW_OP_name (op); |
b1bfef65 TT |
2890 | |
2891 | if (name) | |
2892 | error (_("DWARF operator %s cannot be translated to an agent expression"), | |
2893 | name); | |
2894 | else | |
1ba1b353 TT |
2895 | error (_("Unknown DWARF operator 0x%02x cannot be translated " |
2896 | "to an agent expression"), | |
b1bfef65 | 2897 | op); |
3cf03773 | 2898 | } |
08922a10 | 2899 | |
0fde2c53 DE |
2900 | /* See dwarf2loc.h. |
2901 | ||
2902 | This is basically a wrapper on gdbarch_dwarf2_reg_to_regnum so that we | |
2903 | can issue a complaint, which is better than having every target's | |
2904 | implementation of dwarf2_reg_to_regnum do it. */ | |
08922a10 | 2905 | |
d064d1be | 2906 | int |
0fde2c53 | 2907 | dwarf_reg_to_regnum (struct gdbarch *arch, int dwarf_reg) |
3cf03773 TT |
2908 | { |
2909 | int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg); | |
0fde2c53 | 2910 | |
3cf03773 | 2911 | if (reg == -1) |
0fde2c53 DE |
2912 | { |
2913 | complaint (&symfile_complaints, | |
2914 | _("bad DWARF register number %d"), dwarf_reg); | |
2915 | } | |
2916 | return reg; | |
2917 | } | |
2918 | ||
2919 | /* Subroutine of dwarf_reg_to_regnum_or_error to simplify it. | |
2920 | Throw an error because DWARF_REG is bad. */ | |
2921 | ||
2922 | static void | |
2923 | throw_bad_regnum_error (ULONGEST dwarf_reg) | |
2924 | { | |
2925 | /* Still want to print -1 as "-1". | |
2926 | We *could* have int and ULONGEST versions of dwarf2_reg_to_regnum_or_error | |
2927 | but that's overkill for now. */ | |
2928 | if ((int) dwarf_reg == dwarf_reg) | |
2929 | error (_("Unable to access DWARF register number %d"), (int) dwarf_reg); | |
2930 | error (_("Unable to access DWARF register number %s"), | |
2931 | pulongest (dwarf_reg)); | |
2932 | } | |
2933 | ||
2934 | /* See dwarf2loc.h. */ | |
2935 | ||
2936 | int | |
2937 | dwarf_reg_to_regnum_or_error (struct gdbarch *arch, ULONGEST dwarf_reg) | |
2938 | { | |
2939 | int reg; | |
2940 | ||
2941 | if (dwarf_reg > INT_MAX) | |
2942 | throw_bad_regnum_error (dwarf_reg); | |
2943 | /* Yes, we will end up issuing a complaint and an error if DWARF_REG is | |
2944 | bad, but that's ok. */ | |
2945 | reg = dwarf_reg_to_regnum (arch, (int) dwarf_reg); | |
2946 | if (reg == -1) | |
2947 | throw_bad_regnum_error (dwarf_reg); | |
3cf03773 TT |
2948 | return reg; |
2949 | } | |
08922a10 | 2950 | |
3cf03773 TT |
2951 | /* A helper function that emits an access to memory. ARCH is the |
2952 | target architecture. EXPR is the expression which we are building. | |
2953 | NBITS is the number of bits we want to read. This emits the | |
2954 | opcodes needed to read the memory and then extract the desired | |
2955 | bits. */ | |
08922a10 | 2956 | |
3cf03773 TT |
2957 | static void |
2958 | access_memory (struct gdbarch *arch, struct agent_expr *expr, ULONGEST nbits) | |
08922a10 | 2959 | { |
3cf03773 TT |
2960 | ULONGEST nbytes = (nbits + 7) / 8; |
2961 | ||
9df7235c | 2962 | gdb_assert (nbytes > 0 && nbytes <= sizeof (LONGEST)); |
3cf03773 | 2963 | |
92bc6a20 | 2964 | if (expr->tracing) |
3cf03773 TT |
2965 | ax_trace_quick (expr, nbytes); |
2966 | ||
2967 | if (nbits <= 8) | |
2968 | ax_simple (expr, aop_ref8); | |
2969 | else if (nbits <= 16) | |
2970 | ax_simple (expr, aop_ref16); | |
2971 | else if (nbits <= 32) | |
2972 | ax_simple (expr, aop_ref32); | |
2973 | else | |
2974 | ax_simple (expr, aop_ref64); | |
2975 | ||
2976 | /* If we read exactly the number of bytes we wanted, we're done. */ | |
2977 | if (8 * nbytes == nbits) | |
2978 | return; | |
2979 | ||
2980 | if (gdbarch_bits_big_endian (arch)) | |
0d53c4c4 | 2981 | { |
3cf03773 TT |
2982 | /* On a bits-big-endian machine, we want the high-order |
2983 | NBITS. */ | |
2984 | ax_const_l (expr, 8 * nbytes - nbits); | |
2985 | ax_simple (expr, aop_rsh_unsigned); | |
0d53c4c4 | 2986 | } |
3cf03773 | 2987 | else |
0d53c4c4 | 2988 | { |
3cf03773 TT |
2989 | /* On a bits-little-endian box, we want the low-order NBITS. */ |
2990 | ax_zero_ext (expr, nbits); | |
0d53c4c4 | 2991 | } |
3cf03773 | 2992 | } |
0936ad1d | 2993 | |
8cf6f0b1 TT |
2994 | /* A helper function to return the frame's PC. */ |
2995 | ||
2996 | static CORE_ADDR | |
2997 | get_ax_pc (void *baton) | |
2998 | { | |
9a3c8263 | 2999 | struct agent_expr *expr = (struct agent_expr *) baton; |
8cf6f0b1 TT |
3000 | |
3001 | return expr->scope; | |
3002 | } | |
3003 | ||
3cf03773 TT |
3004 | /* Compile a DWARF location expression to an agent expression. |
3005 | ||
3006 | EXPR is the agent expression we are building. | |
3007 | LOC is the agent value we modify. | |
3008 | ARCH is the architecture. | |
3009 | ADDR_SIZE is the size of addresses, in bytes. | |
3010 | OP_PTR is the start of the location expression. | |
3011 | OP_END is one past the last byte of the location expression. | |
3012 | ||
3013 | This will throw an exception for various kinds of errors -- for | |
3014 | example, if the expression cannot be compiled, or if the expression | |
3015 | is invalid. */ | |
0936ad1d | 3016 | |
9f6f94ff TT |
3017 | void |
3018 | dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
3019 | struct gdbarch *arch, unsigned int addr_size, | |
3020 | const gdb_byte *op_ptr, const gdb_byte *op_end, | |
3021 | struct dwarf2_per_cu_data *per_cu) | |
3cf03773 | 3022 | { |
58414334 TT |
3023 | int i; |
3024 | std::vector<int> dw_labels, patches; | |
3cf03773 TT |
3025 | const gdb_byte * const base = op_ptr; |
3026 | const gdb_byte *previous_piece = op_ptr; | |
3027 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
3028 | ULONGEST bits_collected = 0; | |
3029 | unsigned int addr_size_bits = 8 * addr_size; | |
3030 | int bits_big_endian = gdbarch_bits_big_endian (arch); | |
0936ad1d | 3031 | |
58414334 | 3032 | std::vector<int> offsets (op_end - op_ptr, -1); |
0936ad1d | 3033 | |
3cf03773 TT |
3034 | /* By default we are making an address. */ |
3035 | loc->kind = axs_lvalue_memory; | |
0d45f56e | 3036 | |
3cf03773 TT |
3037 | while (op_ptr < op_end) |
3038 | { | |
aead7601 | 3039 | enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr; |
9fccedf7 DE |
3040 | uint64_t uoffset, reg; |
3041 | int64_t offset; | |
3cf03773 TT |
3042 | int i; |
3043 | ||
3044 | offsets[op_ptr - base] = expr->len; | |
3045 | ++op_ptr; | |
3046 | ||
3047 | /* Our basic approach to code generation is to map DWARF | |
3048 | operations directly to AX operations. However, there are | |
3049 | some differences. | |
3050 | ||
3051 | First, DWARF works on address-sized units, but AX always uses | |
3052 | LONGEST. For most operations we simply ignore this | |
3053 | difference; instead we generate sign extensions as needed | |
3054 | before division and comparison operations. It would be nice | |
3055 | to omit the sign extensions, but there is no way to determine | |
3056 | the size of the target's LONGEST. (This code uses the size | |
3057 | of the host LONGEST in some cases -- that is a bug but it is | |
3058 | difficult to fix.) | |
3059 | ||
3060 | Second, some DWARF operations cannot be translated to AX. | |
3061 | For these we simply fail. See | |
3062 | http://sourceware.org/bugzilla/show_bug.cgi?id=11662. */ | |
3063 | switch (op) | |
0936ad1d | 3064 | { |
3cf03773 TT |
3065 | case DW_OP_lit0: |
3066 | case DW_OP_lit1: | |
3067 | case DW_OP_lit2: | |
3068 | case DW_OP_lit3: | |
3069 | case DW_OP_lit4: | |
3070 | case DW_OP_lit5: | |
3071 | case DW_OP_lit6: | |
3072 | case DW_OP_lit7: | |
3073 | case DW_OP_lit8: | |
3074 | case DW_OP_lit9: | |
3075 | case DW_OP_lit10: | |
3076 | case DW_OP_lit11: | |
3077 | case DW_OP_lit12: | |
3078 | case DW_OP_lit13: | |
3079 | case DW_OP_lit14: | |
3080 | case DW_OP_lit15: | |
3081 | case DW_OP_lit16: | |
3082 | case DW_OP_lit17: | |
3083 | case DW_OP_lit18: | |
3084 | case DW_OP_lit19: | |
3085 | case DW_OP_lit20: | |
3086 | case DW_OP_lit21: | |
3087 | case DW_OP_lit22: | |
3088 | case DW_OP_lit23: | |
3089 | case DW_OP_lit24: | |
3090 | case DW_OP_lit25: | |
3091 | case DW_OP_lit26: | |
3092 | case DW_OP_lit27: | |
3093 | case DW_OP_lit28: | |
3094 | case DW_OP_lit29: | |
3095 | case DW_OP_lit30: | |
3096 | case DW_OP_lit31: | |
3097 | ax_const_l (expr, op - DW_OP_lit0); | |
3098 | break; | |
0d53c4c4 | 3099 | |
3cf03773 | 3100 | case DW_OP_addr: |
ac56253d | 3101 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
3cf03773 | 3102 | op_ptr += addr_size; |
ac56253d TT |
3103 | /* Some versions of GCC emit DW_OP_addr before |
3104 | DW_OP_GNU_push_tls_address. In this case the value is an | |
3105 | index, not an address. We don't support things like | |
3106 | branching between the address and the TLS op. */ | |
3107 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
9aa1f1e3 | 3108 | uoffset += dwarf2_per_cu_text_offset (per_cu); |
ac56253d | 3109 | ax_const_l (expr, uoffset); |
3cf03773 | 3110 | break; |
4c2df51b | 3111 | |
3cf03773 TT |
3112 | case DW_OP_const1u: |
3113 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 1, byte_order)); | |
3114 | op_ptr += 1; | |
3115 | break; | |
3116 | case DW_OP_const1s: | |
3117 | ax_const_l (expr, extract_signed_integer (op_ptr, 1, byte_order)); | |
3118 | op_ptr += 1; | |
3119 | break; | |
3120 | case DW_OP_const2u: | |
3121 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 2, byte_order)); | |
3122 | op_ptr += 2; | |
3123 | break; | |
3124 | case DW_OP_const2s: | |
3125 | ax_const_l (expr, extract_signed_integer (op_ptr, 2, byte_order)); | |
3126 | op_ptr += 2; | |
3127 | break; | |
3128 | case DW_OP_const4u: | |
3129 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 4, byte_order)); | |
3130 | op_ptr += 4; | |
3131 | break; | |
3132 | case DW_OP_const4s: | |
3133 | ax_const_l (expr, extract_signed_integer (op_ptr, 4, byte_order)); | |
3134 | op_ptr += 4; | |
3135 | break; | |
3136 | case DW_OP_const8u: | |
3137 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 8, byte_order)); | |
3138 | op_ptr += 8; | |
3139 | break; | |
3140 | case DW_OP_const8s: | |
3141 | ax_const_l (expr, extract_signed_integer (op_ptr, 8, byte_order)); | |
3142 | op_ptr += 8; | |
3143 | break; | |
3144 | case DW_OP_constu: | |
f664829e | 3145 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
3cf03773 TT |
3146 | ax_const_l (expr, uoffset); |
3147 | break; | |
3148 | case DW_OP_consts: | |
f664829e | 3149 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
3cf03773 TT |
3150 | ax_const_l (expr, offset); |
3151 | break; | |
9c238357 | 3152 | |
3cf03773 TT |
3153 | case DW_OP_reg0: |
3154 | case DW_OP_reg1: | |
3155 | case DW_OP_reg2: | |
3156 | case DW_OP_reg3: | |
3157 | case DW_OP_reg4: | |
3158 | case DW_OP_reg5: | |
3159 | case DW_OP_reg6: | |
3160 | case DW_OP_reg7: | |
3161 | case DW_OP_reg8: | |
3162 | case DW_OP_reg9: | |
3163 | case DW_OP_reg10: | |
3164 | case DW_OP_reg11: | |
3165 | case DW_OP_reg12: | |
3166 | case DW_OP_reg13: | |
3167 | case DW_OP_reg14: | |
3168 | case DW_OP_reg15: | |
3169 | case DW_OP_reg16: | |
3170 | case DW_OP_reg17: | |
3171 | case DW_OP_reg18: | |
3172 | case DW_OP_reg19: | |
3173 | case DW_OP_reg20: | |
3174 | case DW_OP_reg21: | |
3175 | case DW_OP_reg22: | |
3176 | case DW_OP_reg23: | |
3177 | case DW_OP_reg24: | |
3178 | case DW_OP_reg25: | |
3179 | case DW_OP_reg26: | |
3180 | case DW_OP_reg27: | |
3181 | case DW_OP_reg28: | |
3182 | case DW_OP_reg29: | |
3183 | case DW_OP_reg30: | |
3184 | case DW_OP_reg31: | |
3185 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
0fde2c53 | 3186 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_reg0); |
3cf03773 TT |
3187 | loc->kind = axs_lvalue_register; |
3188 | break; | |
9c238357 | 3189 | |
3cf03773 | 3190 | case DW_OP_regx: |
f664829e | 3191 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 | 3192 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); |
0fde2c53 | 3193 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3194 | loc->kind = axs_lvalue_register; |
3195 | break; | |
08922a10 | 3196 | |
3cf03773 TT |
3197 | case DW_OP_implicit_value: |
3198 | { | |
9fccedf7 | 3199 | uint64_t len; |
3cf03773 | 3200 | |
f664829e | 3201 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &len); |
3cf03773 TT |
3202 | if (op_ptr + len > op_end) |
3203 | error (_("DW_OP_implicit_value: too few bytes available.")); | |
3204 | if (len > sizeof (ULONGEST)) | |
3205 | error (_("Cannot translate DW_OP_implicit_value of %d bytes"), | |
3206 | (int) len); | |
3207 | ||
3208 | ax_const_l (expr, extract_unsigned_integer (op_ptr, len, | |
3209 | byte_order)); | |
3210 | op_ptr += len; | |
3211 | dwarf_expr_require_composition (op_ptr, op_end, | |
3212 | "DW_OP_implicit_value"); | |
3213 | ||
3214 | loc->kind = axs_rvalue; | |
3215 | } | |
3216 | break; | |
08922a10 | 3217 | |
3cf03773 TT |
3218 | case DW_OP_stack_value: |
3219 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value"); | |
3220 | loc->kind = axs_rvalue; | |
3221 | break; | |
08922a10 | 3222 | |
3cf03773 TT |
3223 | case DW_OP_breg0: |
3224 | case DW_OP_breg1: | |
3225 | case DW_OP_breg2: | |
3226 | case DW_OP_breg3: | |
3227 | case DW_OP_breg4: | |
3228 | case DW_OP_breg5: | |
3229 | case DW_OP_breg6: | |
3230 | case DW_OP_breg7: | |
3231 | case DW_OP_breg8: | |
3232 | case DW_OP_breg9: | |
3233 | case DW_OP_breg10: | |
3234 | case DW_OP_breg11: | |
3235 | case DW_OP_breg12: | |
3236 | case DW_OP_breg13: | |
3237 | case DW_OP_breg14: | |
3238 | case DW_OP_breg15: | |
3239 | case DW_OP_breg16: | |
3240 | case DW_OP_breg17: | |
3241 | case DW_OP_breg18: | |
3242 | case DW_OP_breg19: | |
3243 | case DW_OP_breg20: | |
3244 | case DW_OP_breg21: | |
3245 | case DW_OP_breg22: | |
3246 | case DW_OP_breg23: | |
3247 | case DW_OP_breg24: | |
3248 | case DW_OP_breg25: | |
3249 | case DW_OP_breg26: | |
3250 | case DW_OP_breg27: | |
3251 | case DW_OP_breg28: | |
3252 | case DW_OP_breg29: | |
3253 | case DW_OP_breg30: | |
3254 | case DW_OP_breg31: | |
f664829e | 3255 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
0fde2c53 | 3256 | i = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_breg0); |
3cf03773 TT |
3257 | ax_reg (expr, i); |
3258 | if (offset != 0) | |
3259 | { | |
3260 | ax_const_l (expr, offset); | |
3261 | ax_simple (expr, aop_add); | |
3262 | } | |
3263 | break; | |
3264 | case DW_OP_bregx: | |
3265 | { | |
f664829e DE |
3266 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3267 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
0fde2c53 | 3268 | i = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3269 | ax_reg (expr, i); |
3270 | if (offset != 0) | |
3271 | { | |
3272 | ax_const_l (expr, offset); | |
3273 | ax_simple (expr, aop_add); | |
3274 | } | |
3275 | } | |
3276 | break; | |
3277 | case DW_OP_fbreg: | |
3278 | { | |
3279 | const gdb_byte *datastart; | |
3280 | size_t datalen; | |
3977b71f | 3281 | const struct block *b; |
3cf03773 | 3282 | struct symbol *framefunc; |
08922a10 | 3283 | |
3cf03773 TT |
3284 | b = block_for_pc (expr->scope); |
3285 | ||
3286 | if (!b) | |
3287 | error (_("No block found for address")); | |
3288 | ||
3289 | framefunc = block_linkage_function (b); | |
3290 | ||
3291 | if (!framefunc) | |
3292 | error (_("No function found for block")); | |
3293 | ||
af945b75 TT |
3294 | func_get_frame_base_dwarf_block (framefunc, expr->scope, |
3295 | &datastart, &datalen); | |
3cf03773 | 3296 | |
f664829e | 3297 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
9f6f94ff TT |
3298 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, datastart, |
3299 | datastart + datalen, per_cu); | |
d84cf7eb TT |
3300 | if (loc->kind == axs_lvalue_register) |
3301 | require_rvalue (expr, loc); | |
3cf03773 TT |
3302 | |
3303 | if (offset != 0) | |
3304 | { | |
3305 | ax_const_l (expr, offset); | |
3306 | ax_simple (expr, aop_add); | |
3307 | } | |
3308 | ||
3309 | loc->kind = axs_lvalue_memory; | |
3310 | } | |
08922a10 | 3311 | break; |
08922a10 | 3312 | |
3cf03773 TT |
3313 | case DW_OP_dup: |
3314 | ax_simple (expr, aop_dup); | |
3315 | break; | |
08922a10 | 3316 | |
3cf03773 TT |
3317 | case DW_OP_drop: |
3318 | ax_simple (expr, aop_pop); | |
3319 | break; | |
08922a10 | 3320 | |
3cf03773 TT |
3321 | case DW_OP_pick: |
3322 | offset = *op_ptr++; | |
c7f96d2b | 3323 | ax_pick (expr, offset); |
3cf03773 TT |
3324 | break; |
3325 | ||
3326 | case DW_OP_swap: | |
3327 | ax_simple (expr, aop_swap); | |
3328 | break; | |
08922a10 | 3329 | |
3cf03773 | 3330 | case DW_OP_over: |
c7f96d2b | 3331 | ax_pick (expr, 1); |
3cf03773 | 3332 | break; |
08922a10 | 3333 | |
3cf03773 | 3334 | case DW_OP_rot: |
c7f96d2b | 3335 | ax_simple (expr, aop_rot); |
3cf03773 | 3336 | break; |
08922a10 | 3337 | |
3cf03773 TT |
3338 | case DW_OP_deref: |
3339 | case DW_OP_deref_size: | |
3340 | { | |
3341 | int size; | |
08922a10 | 3342 | |
3cf03773 TT |
3343 | if (op == DW_OP_deref_size) |
3344 | size = *op_ptr++; | |
3345 | else | |
3346 | size = addr_size; | |
3347 | ||
9df7235c | 3348 | if (size != 1 && size != 2 && size != 4 && size != 8) |
f3cec7e6 HZ |
3349 | error (_("Unsupported size %d in %s"), |
3350 | size, get_DW_OP_name (op)); | |
9df7235c | 3351 | access_memory (arch, expr, size * TARGET_CHAR_BIT); |
3cf03773 TT |
3352 | } |
3353 | break; | |
3354 | ||
3355 | case DW_OP_abs: | |
3356 | /* Sign extend the operand. */ | |
3357 | ax_ext (expr, addr_size_bits); | |
3358 | ax_simple (expr, aop_dup); | |
3359 | ax_const_l (expr, 0); | |
3360 | ax_simple (expr, aop_less_signed); | |
3361 | ax_simple (expr, aop_log_not); | |
3362 | i = ax_goto (expr, aop_if_goto); | |
3363 | /* We have to emit 0 - X. */ | |
3364 | ax_const_l (expr, 0); | |
3365 | ax_simple (expr, aop_swap); | |
3366 | ax_simple (expr, aop_sub); | |
3367 | ax_label (expr, i, expr->len); | |
3368 | break; | |
3369 | ||
3370 | case DW_OP_neg: | |
3371 | /* No need to sign extend here. */ | |
3372 | ax_const_l (expr, 0); | |
3373 | ax_simple (expr, aop_swap); | |
3374 | ax_simple (expr, aop_sub); | |
3375 | break; | |
3376 | ||
3377 | case DW_OP_not: | |
3378 | /* Sign extend the operand. */ | |
3379 | ax_ext (expr, addr_size_bits); | |
3380 | ax_simple (expr, aop_bit_not); | |
3381 | break; | |
3382 | ||
3383 | case DW_OP_plus_uconst: | |
f664829e | 3384 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 TT |
3385 | /* It would be really weird to emit `DW_OP_plus_uconst 0', |
3386 | but we micro-optimize anyhow. */ | |
3387 | if (reg != 0) | |
3388 | { | |
3389 | ax_const_l (expr, reg); | |
3390 | ax_simple (expr, aop_add); | |
3391 | } | |
3392 | break; | |
3393 | ||
3394 | case DW_OP_and: | |
3395 | ax_simple (expr, aop_bit_and); | |
3396 | break; | |
3397 | ||
3398 | case DW_OP_div: | |
3399 | /* Sign extend the operands. */ | |
3400 | ax_ext (expr, addr_size_bits); | |
3401 | ax_simple (expr, aop_swap); | |
3402 | ax_ext (expr, addr_size_bits); | |
3403 | ax_simple (expr, aop_swap); | |
3404 | ax_simple (expr, aop_div_signed); | |
08922a10 SS |
3405 | break; |
3406 | ||
3cf03773 TT |
3407 | case DW_OP_minus: |
3408 | ax_simple (expr, aop_sub); | |
3409 | break; | |
3410 | ||
3411 | case DW_OP_mod: | |
3412 | ax_simple (expr, aop_rem_unsigned); | |
3413 | break; | |
3414 | ||
3415 | case DW_OP_mul: | |
3416 | ax_simple (expr, aop_mul); | |
3417 | break; | |
3418 | ||
3419 | case DW_OP_or: | |
3420 | ax_simple (expr, aop_bit_or); | |
3421 | break; | |
3422 | ||
3423 | case DW_OP_plus: | |
3424 | ax_simple (expr, aop_add); | |
3425 | break; | |
3426 | ||
3427 | case DW_OP_shl: | |
3428 | ax_simple (expr, aop_lsh); | |
3429 | break; | |
3430 | ||
3431 | case DW_OP_shr: | |
3432 | ax_simple (expr, aop_rsh_unsigned); | |
3433 | break; | |
3434 | ||
3435 | case DW_OP_shra: | |
3436 | ax_simple (expr, aop_rsh_signed); | |
3437 | break; | |
3438 | ||
3439 | case DW_OP_xor: | |
3440 | ax_simple (expr, aop_bit_xor); | |
3441 | break; | |
3442 | ||
3443 | case DW_OP_le: | |
3444 | /* Sign extend the operands. */ | |
3445 | ax_ext (expr, addr_size_bits); | |
3446 | ax_simple (expr, aop_swap); | |
3447 | ax_ext (expr, addr_size_bits); | |
3448 | /* Note no swap here: A <= B is !(B < A). */ | |
3449 | ax_simple (expr, aop_less_signed); | |
3450 | ax_simple (expr, aop_log_not); | |
3451 | break; | |
3452 | ||
3453 | case DW_OP_ge: | |
3454 | /* Sign extend the operands. */ | |
3455 | ax_ext (expr, addr_size_bits); | |
3456 | ax_simple (expr, aop_swap); | |
3457 | ax_ext (expr, addr_size_bits); | |
3458 | ax_simple (expr, aop_swap); | |
3459 | /* A >= B is !(A < B). */ | |
3460 | ax_simple (expr, aop_less_signed); | |
3461 | ax_simple (expr, aop_log_not); | |
3462 | break; | |
3463 | ||
3464 | case DW_OP_eq: | |
3465 | /* Sign extend the operands. */ | |
3466 | ax_ext (expr, addr_size_bits); | |
3467 | ax_simple (expr, aop_swap); | |
3468 | ax_ext (expr, addr_size_bits); | |
3469 | /* No need for a second swap here. */ | |
3470 | ax_simple (expr, aop_equal); | |
3471 | break; | |
3472 | ||
3473 | case DW_OP_lt: | |
3474 | /* Sign extend the operands. */ | |
3475 | ax_ext (expr, addr_size_bits); | |
3476 | ax_simple (expr, aop_swap); | |
3477 | ax_ext (expr, addr_size_bits); | |
3478 | ax_simple (expr, aop_swap); | |
3479 | ax_simple (expr, aop_less_signed); | |
3480 | break; | |
3481 | ||
3482 | case DW_OP_gt: | |
3483 | /* Sign extend the operands. */ | |
3484 | ax_ext (expr, addr_size_bits); | |
3485 | ax_simple (expr, aop_swap); | |
3486 | ax_ext (expr, addr_size_bits); | |
3487 | /* Note no swap here: A > B is B < A. */ | |
3488 | ax_simple (expr, aop_less_signed); | |
3489 | break; | |
3490 | ||
3491 | case DW_OP_ne: | |
3492 | /* Sign extend the operands. */ | |
3493 | ax_ext (expr, addr_size_bits); | |
3494 | ax_simple (expr, aop_swap); | |
3495 | ax_ext (expr, addr_size_bits); | |
3496 | /* No need for a swap here. */ | |
3497 | ax_simple (expr, aop_equal); | |
3498 | ax_simple (expr, aop_log_not); | |
3499 | break; | |
3500 | ||
3501 | case DW_OP_call_frame_cfa: | |
a8fd5589 TT |
3502 | { |
3503 | int regnum; | |
3504 | CORE_ADDR text_offset; | |
3505 | LONGEST off; | |
3506 | const gdb_byte *cfa_start, *cfa_end; | |
3507 | ||
3508 | if (dwarf2_fetch_cfa_info (arch, expr->scope, per_cu, | |
3509 | ®num, &off, | |
3510 | &text_offset, &cfa_start, &cfa_end)) | |
3511 | { | |
3512 | /* Register. */ | |
3513 | ax_reg (expr, regnum); | |
3514 | if (off != 0) | |
3515 | { | |
3516 | ax_const_l (expr, off); | |
3517 | ax_simple (expr, aop_add); | |
3518 | } | |
3519 | } | |
3520 | else | |
3521 | { | |
3522 | /* Another expression. */ | |
3523 | ax_const_l (expr, text_offset); | |
3524 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, | |
3525 | cfa_start, cfa_end, per_cu); | |
3526 | } | |
3527 | ||
3528 | loc->kind = axs_lvalue_memory; | |
3529 | } | |
3cf03773 TT |
3530 | break; |
3531 | ||
3532 | case DW_OP_GNU_push_tls_address: | |
4aa4e28b | 3533 | case DW_OP_form_tls_address: |
3cf03773 TT |
3534 | unimplemented (op); |
3535 | break; | |
3536 | ||
08412b07 JB |
3537 | case DW_OP_push_object_address: |
3538 | unimplemented (op); | |
3539 | break; | |
3540 | ||
3cf03773 TT |
3541 | case DW_OP_skip: |
3542 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3543 | op_ptr += 2; | |
3544 | i = ax_goto (expr, aop_goto); | |
58414334 TT |
3545 | dw_labels.push_back (op_ptr + offset - base); |
3546 | patches.push_back (i); | |
3cf03773 TT |
3547 | break; |
3548 | ||
3549 | case DW_OP_bra: | |
3550 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3551 | op_ptr += 2; | |
3552 | /* Zero extend the operand. */ | |
3553 | ax_zero_ext (expr, addr_size_bits); | |
3554 | i = ax_goto (expr, aop_if_goto); | |
58414334 TT |
3555 | dw_labels.push_back (op_ptr + offset - base); |
3556 | patches.push_back (i); | |
3cf03773 TT |
3557 | break; |
3558 | ||
3559 | case DW_OP_nop: | |
3560 | break; | |
3561 | ||
3562 | case DW_OP_piece: | |
3563 | case DW_OP_bit_piece: | |
08922a10 | 3564 | { |
9fccedf7 | 3565 | uint64_t size, offset; |
3cf03773 TT |
3566 | |
3567 | if (op_ptr - 1 == previous_piece) | |
3568 | error (_("Cannot translate empty pieces to agent expressions")); | |
3569 | previous_piece = op_ptr - 1; | |
3570 | ||
f664829e | 3571 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &size); |
3cf03773 TT |
3572 | if (op == DW_OP_piece) |
3573 | { | |
3574 | size *= 8; | |
3575 | offset = 0; | |
3576 | } | |
3577 | else | |
f664829e | 3578 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &offset); |
08922a10 | 3579 | |
3cf03773 TT |
3580 | if (bits_collected + size > 8 * sizeof (LONGEST)) |
3581 | error (_("Expression pieces exceed word size")); | |
3582 | ||
3583 | /* Access the bits. */ | |
3584 | switch (loc->kind) | |
3585 | { | |
3586 | case axs_lvalue_register: | |
3587 | ax_reg (expr, loc->u.reg); | |
3588 | break; | |
3589 | ||
3590 | case axs_lvalue_memory: | |
3591 | /* Offset the pointer, if needed. */ | |
3592 | if (offset > 8) | |
3593 | { | |
3594 | ax_const_l (expr, offset / 8); | |
3595 | ax_simple (expr, aop_add); | |
3596 | offset %= 8; | |
3597 | } | |
3598 | access_memory (arch, expr, size); | |
3599 | break; | |
3600 | } | |
3601 | ||
3602 | /* For a bits-big-endian target, shift up what we already | |
3603 | have. For a bits-little-endian target, shift up the | |
3604 | new data. Note that there is a potential bug here if | |
3605 | the DWARF expression leaves multiple values on the | |
3606 | stack. */ | |
3607 | if (bits_collected > 0) | |
3608 | { | |
3609 | if (bits_big_endian) | |
3610 | { | |
3611 | ax_simple (expr, aop_swap); | |
3612 | ax_const_l (expr, size); | |
3613 | ax_simple (expr, aop_lsh); | |
3614 | /* We don't need a second swap here, because | |
3615 | aop_bit_or is symmetric. */ | |
3616 | } | |
3617 | else | |
3618 | { | |
3619 | ax_const_l (expr, size); | |
3620 | ax_simple (expr, aop_lsh); | |
3621 | } | |
3622 | ax_simple (expr, aop_bit_or); | |
3623 | } | |
3624 | ||
3625 | bits_collected += size; | |
3626 | loc->kind = axs_rvalue; | |
08922a10 SS |
3627 | } |
3628 | break; | |
08922a10 | 3629 | |
3cf03773 TT |
3630 | case DW_OP_GNU_uninit: |
3631 | unimplemented (op); | |
3632 | ||
3633 | case DW_OP_call2: | |
3634 | case DW_OP_call4: | |
3635 | { | |
3636 | struct dwarf2_locexpr_baton block; | |
3637 | int size = (op == DW_OP_call2 ? 2 : 4); | |
b64f50a1 | 3638 | cu_offset offset; |
3cf03773 TT |
3639 | |
3640 | uoffset = extract_unsigned_integer (op_ptr, size, byte_order); | |
3641 | op_ptr += size; | |
3642 | ||
b64f50a1 | 3643 | offset.cu_off = uoffset; |
8b9737bf TT |
3644 | block = dwarf2_fetch_die_loc_cu_off (offset, per_cu, |
3645 | get_ax_pc, expr); | |
3cf03773 TT |
3646 | |
3647 | /* DW_OP_call_ref is currently not supported. */ | |
3648 | gdb_assert (block.per_cu == per_cu); | |
3649 | ||
9f6f94ff TT |
3650 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, |
3651 | block.data, block.data + block.size, | |
3652 | per_cu); | |
3cf03773 TT |
3653 | } |
3654 | break; | |
3655 | ||
3656 | case DW_OP_call_ref: | |
3657 | unimplemented (op); | |
3658 | ||
3659 | default: | |
b1bfef65 | 3660 | unimplemented (op); |
08922a10 | 3661 | } |
08922a10 | 3662 | } |
3cf03773 TT |
3663 | |
3664 | /* Patch all the branches we emitted. */ | |
58414334 | 3665 | for (i = 0; i < patches.size (); ++i) |
3cf03773 | 3666 | { |
58414334 | 3667 | int targ = offsets[dw_labels[i]]; |
3cf03773 TT |
3668 | if (targ == -1) |
3669 | internal_error (__FILE__, __LINE__, _("invalid label")); | |
58414334 | 3670 | ax_label (expr, patches[i], targ); |
3cf03773 | 3671 | } |
08922a10 SS |
3672 | } |
3673 | ||
4c2df51b DJ |
3674 | \f |
3675 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
3676 | evaluator to calculate the location. */ | |
3677 | static struct value * | |
3678 | locexpr_read_variable (struct symbol *symbol, struct frame_info *frame) | |
3679 | { | |
9a3c8263 SM |
3680 | struct dwarf2_locexpr_baton *dlbaton |
3681 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
4c2df51b | 3682 | struct value *val; |
9a619af0 | 3683 | |
a2d33775 JK |
3684 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data, |
3685 | dlbaton->size, dlbaton->per_cu); | |
4c2df51b DJ |
3686 | |
3687 | return val; | |
3688 | } | |
3689 | ||
e18b2753 JK |
3690 | /* Return the value of SYMBOL in FRAME at (callee) FRAME's function |
3691 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
3692 | will be thrown. */ | |
3693 | ||
3694 | static struct value * | |
3695 | locexpr_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
3696 | { | |
9a3c8263 SM |
3697 | struct dwarf2_locexpr_baton *dlbaton |
3698 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
3699 | |
3700 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, dlbaton->data, | |
3701 | dlbaton->size); | |
3702 | } | |
3703 | ||
0b31a4bc TT |
3704 | /* Implementation of get_symbol_read_needs from |
3705 | symbol_computed_ops. */ | |
3706 | ||
3707 | static enum symbol_needs_kind | |
3708 | locexpr_get_symbol_read_needs (struct symbol *symbol) | |
4c2df51b | 3709 | { |
9a3c8263 SM |
3710 | struct dwarf2_locexpr_baton *dlbaton |
3711 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
9a619af0 | 3712 | |
0b31a4bc TT |
3713 | return dwarf2_loc_desc_get_symbol_read_needs (dlbaton->data, dlbaton->size, |
3714 | dlbaton->per_cu); | |
4c2df51b DJ |
3715 | } |
3716 | ||
9eae7c52 TT |
3717 | /* Return true if DATA points to the end of a piece. END is one past |
3718 | the last byte in the expression. */ | |
3719 | ||
3720 | static int | |
3721 | piece_end_p (const gdb_byte *data, const gdb_byte *end) | |
3722 | { | |
3723 | return data == end || data[0] == DW_OP_piece || data[0] == DW_OP_bit_piece; | |
3724 | } | |
3725 | ||
5e44ecb3 TT |
3726 | /* Helper for locexpr_describe_location_piece that finds the name of a |
3727 | DWARF register. */ | |
3728 | ||
3729 | static const char * | |
3730 | locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum) | |
3731 | { | |
3732 | int regnum; | |
3733 | ||
0fde2c53 DE |
3734 | /* This doesn't use dwarf_reg_to_regnum_or_error on purpose. |
3735 | We'd rather print *something* here than throw an error. */ | |
3736 | regnum = dwarf_reg_to_regnum (gdbarch, dwarf_regnum); | |
3737 | /* gdbarch_register_name may just return "", return something more | |
3738 | descriptive for bad register numbers. */ | |
3739 | if (regnum == -1) | |
3740 | { | |
3741 | /* The text is output as "$bad_register_number". | |
3742 | That is why we use the underscores. */ | |
3743 | return _("bad_register_number"); | |
3744 | } | |
5e44ecb3 TT |
3745 | return gdbarch_register_name (gdbarch, regnum); |
3746 | } | |
3747 | ||
9eae7c52 TT |
3748 | /* Nicely describe a single piece of a location, returning an updated |
3749 | position in the bytecode sequence. This function cannot recognize | |
3750 | all locations; if a location is not recognized, it simply returns | |
f664829e DE |
3751 | DATA. If there is an error during reading, e.g. we run off the end |
3752 | of the buffer, an error is thrown. */ | |
08922a10 | 3753 | |
0d45f56e | 3754 | static const gdb_byte * |
08922a10 SS |
3755 | locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream, |
3756 | CORE_ADDR addr, struct objfile *objfile, | |
49f6c839 | 3757 | struct dwarf2_per_cu_data *per_cu, |
9eae7c52 | 3758 | const gdb_byte *data, const gdb_byte *end, |
0d45f56e | 3759 | unsigned int addr_size) |
4c2df51b | 3760 | { |
08922a10 | 3761 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
49f6c839 | 3762 | size_t leb128_size; |
08922a10 SS |
3763 | |
3764 | if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31) | |
3765 | { | |
08922a10 | 3766 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3767 | locexpr_regname (gdbarch, data[0] - DW_OP_reg0)); |
08922a10 SS |
3768 | data += 1; |
3769 | } | |
3770 | else if (data[0] == DW_OP_regx) | |
3771 | { | |
9fccedf7 | 3772 | uint64_t reg; |
4c2df51b | 3773 | |
f664829e | 3774 | data = safe_read_uleb128 (data + 1, end, ®); |
08922a10 | 3775 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3776 | locexpr_regname (gdbarch, reg)); |
08922a10 SS |
3777 | } |
3778 | else if (data[0] == DW_OP_fbreg) | |
4c2df51b | 3779 | { |
3977b71f | 3780 | const struct block *b; |
08922a10 SS |
3781 | struct symbol *framefunc; |
3782 | int frame_reg = 0; | |
9fccedf7 | 3783 | int64_t frame_offset; |
7155d578 | 3784 | const gdb_byte *base_data, *new_data, *save_data = data; |
08922a10 | 3785 | size_t base_size; |
9fccedf7 | 3786 | int64_t base_offset = 0; |
08922a10 | 3787 | |
f664829e | 3788 | new_data = safe_read_sleb128 (data + 1, end, &frame_offset); |
9eae7c52 TT |
3789 | if (!piece_end_p (new_data, end)) |
3790 | return data; | |
3791 | data = new_data; | |
3792 | ||
08922a10 SS |
3793 | b = block_for_pc (addr); |
3794 | ||
3795 | if (!b) | |
3796 | error (_("No block found for address for symbol \"%s\"."), | |
3797 | SYMBOL_PRINT_NAME (symbol)); | |
3798 | ||
3799 | framefunc = block_linkage_function (b); | |
3800 | ||
3801 | if (!framefunc) | |
3802 | error (_("No function found for block for symbol \"%s\"."), | |
3803 | SYMBOL_PRINT_NAME (symbol)); | |
3804 | ||
af945b75 | 3805 | func_get_frame_base_dwarf_block (framefunc, addr, &base_data, &base_size); |
08922a10 SS |
3806 | |
3807 | if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31) | |
3808 | { | |
0d45f56e | 3809 | const gdb_byte *buf_end; |
08922a10 SS |
3810 | |
3811 | frame_reg = base_data[0] - DW_OP_breg0; | |
f664829e DE |
3812 | buf_end = safe_read_sleb128 (base_data + 1, base_data + base_size, |
3813 | &base_offset); | |
08922a10 | 3814 | if (buf_end != base_data + base_size) |
3e43a32a MS |
3815 | error (_("Unexpected opcode after " |
3816 | "DW_OP_breg%u for symbol \"%s\"."), | |
08922a10 SS |
3817 | frame_reg, SYMBOL_PRINT_NAME (symbol)); |
3818 | } | |
3819 | else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31) | |
3820 | { | |
3821 | /* The frame base is just the register, with no offset. */ | |
3822 | frame_reg = base_data[0] - DW_OP_reg0; | |
3823 | base_offset = 0; | |
3824 | } | |
3825 | else | |
3826 | { | |
3827 | /* We don't know what to do with the frame base expression, | |
3828 | so we can't trace this variable; give up. */ | |
7155d578 | 3829 | return save_data; |
08922a10 SS |
3830 | } |
3831 | ||
3e43a32a MS |
3832 | fprintf_filtered (stream, |
3833 | _("a variable at frame base reg $%s offset %s+%s"), | |
5e44ecb3 | 3834 | locexpr_regname (gdbarch, frame_reg), |
08922a10 SS |
3835 | plongest (base_offset), plongest (frame_offset)); |
3836 | } | |
9eae7c52 TT |
3837 | else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31 |
3838 | && piece_end_p (data, end)) | |
08922a10 | 3839 | { |
9fccedf7 | 3840 | int64_t offset; |
08922a10 | 3841 | |
f664829e | 3842 | data = safe_read_sleb128 (data + 1, end, &offset); |
08922a10 | 3843 | |
4c2df51b | 3844 | fprintf_filtered (stream, |
08922a10 SS |
3845 | _("a variable at offset %s from base reg $%s"), |
3846 | plongest (offset), | |
5e44ecb3 | 3847 | locexpr_regname (gdbarch, data[0] - DW_OP_breg0)); |
4c2df51b DJ |
3848 | } |
3849 | ||
c3228f12 EZ |
3850 | /* The location expression for a TLS variable looks like this (on a |
3851 | 64-bit LE machine): | |
3852 | ||
3853 | DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0 | |
3854 | (DW_OP_addr: 4; DW_OP_GNU_push_tls_address) | |
09d8bd00 | 3855 | |
c3228f12 EZ |
3856 | 0x3 is the encoding for DW_OP_addr, which has an operand as long |
3857 | as the size of an address on the target machine (here is 8 | |
09d8bd00 TT |
3858 | bytes). Note that more recent version of GCC emit DW_OP_const4u |
3859 | or DW_OP_const8u, depending on address size, rather than | |
0963b4bd MS |
3860 | DW_OP_addr. 0xe0 is the encoding for DW_OP_GNU_push_tls_address. |
3861 | The operand represents the offset at which the variable is within | |
3862 | the thread local storage. */ | |
c3228f12 | 3863 | |
9eae7c52 | 3864 | else if (data + 1 + addr_size < end |
09d8bd00 TT |
3865 | && (data[0] == DW_OP_addr |
3866 | || (addr_size == 4 && data[0] == DW_OP_const4u) | |
3867 | || (addr_size == 8 && data[0] == DW_OP_const8u)) | |
4aa4e28b TT |
3868 | && (data[1 + addr_size] == DW_OP_GNU_push_tls_address |
3869 | || data[1 + addr_size] == DW_OP_form_tls_address) | |
9eae7c52 | 3870 | && piece_end_p (data + 2 + addr_size, end)) |
08922a10 | 3871 | { |
d4a087c7 UW |
3872 | ULONGEST offset; |
3873 | offset = extract_unsigned_integer (data + 1, addr_size, | |
3874 | gdbarch_byte_order (gdbarch)); | |
9a619af0 | 3875 | |
08922a10 | 3876 | fprintf_filtered (stream, |
d4a087c7 | 3877 | _("a thread-local variable at offset 0x%s " |
08922a10 | 3878 | "in the thread-local storage for `%s'"), |
4262abfb | 3879 | phex_nz (offset, addr_size), objfile_name (objfile)); |
08922a10 SS |
3880 | |
3881 | data += 1 + addr_size + 1; | |
3882 | } | |
49f6c839 DE |
3883 | |
3884 | /* With -gsplit-dwarf a TLS variable can also look like this: | |
3885 | DW_AT_location : 3 byte block: fc 4 e0 | |
3886 | (DW_OP_GNU_const_index: 4; | |
3887 | DW_OP_GNU_push_tls_address) */ | |
3888 | else if (data + 3 <= end | |
3889 | && data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end | |
3890 | && data[0] == DW_OP_GNU_const_index | |
3891 | && leb128_size > 0 | |
4aa4e28b TT |
3892 | && (data[1 + leb128_size] == DW_OP_GNU_push_tls_address |
3893 | || data[1 + leb128_size] == DW_OP_form_tls_address) | |
49f6c839 DE |
3894 | && piece_end_p (data + 2 + leb128_size, end)) |
3895 | { | |
a55c1f32 | 3896 | uint64_t offset; |
49f6c839 DE |
3897 | |
3898 | data = safe_read_uleb128 (data + 1, end, &offset); | |
3899 | offset = dwarf2_read_addr_index (per_cu, offset); | |
3900 | fprintf_filtered (stream, | |
3901 | _("a thread-local variable at offset 0x%s " | |
3902 | "in the thread-local storage for `%s'"), | |
4262abfb | 3903 | phex_nz (offset, addr_size), objfile_name (objfile)); |
49f6c839 DE |
3904 | ++data; |
3905 | } | |
3906 | ||
9eae7c52 TT |
3907 | else if (data[0] >= DW_OP_lit0 |
3908 | && data[0] <= DW_OP_lit31 | |
3909 | && data + 1 < end | |
3910 | && data[1] == DW_OP_stack_value) | |
3911 | { | |
3912 | fprintf_filtered (stream, _("the constant %d"), data[0] - DW_OP_lit0); | |
3913 | data += 2; | |
3914 | } | |
3915 | ||
3916 | return data; | |
3917 | } | |
3918 | ||
3919 | /* Disassemble an expression, stopping at the end of a piece or at the | |
3920 | end of the expression. Returns a pointer to the next unread byte | |
3921 | in the input expression. If ALL is nonzero, then this function | |
f664829e DE |
3922 | will keep going until it reaches the end of the expression. |
3923 | If there is an error during reading, e.g. we run off the end | |
3924 | of the buffer, an error is thrown. */ | |
9eae7c52 TT |
3925 | |
3926 | static const gdb_byte * | |
3927 | disassemble_dwarf_expression (struct ui_file *stream, | |
3928 | struct gdbarch *arch, unsigned int addr_size, | |
2bda9cc5 | 3929 | int offset_size, const gdb_byte *start, |
9eae7c52 | 3930 | const gdb_byte *data, const gdb_byte *end, |
2bda9cc5 | 3931 | int indent, int all, |
5e44ecb3 | 3932 | struct dwarf2_per_cu_data *per_cu) |
9eae7c52 | 3933 | { |
9eae7c52 TT |
3934 | while (data < end |
3935 | && (all | |
3936 | || (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece))) | |
3937 | { | |
aead7601 | 3938 | enum dwarf_location_atom op = (enum dwarf_location_atom) *data++; |
9fccedf7 DE |
3939 | uint64_t ul; |
3940 | int64_t l; | |
9eae7c52 TT |
3941 | const char *name; |
3942 | ||
f39c6ffd | 3943 | name = get_DW_OP_name (op); |
9eae7c52 TT |
3944 | |
3945 | if (!name) | |
3946 | error (_("Unrecognized DWARF opcode 0x%02x at %ld"), | |
06826322 | 3947 | op, (long) (data - 1 - start)); |
2bda9cc5 JK |
3948 | fprintf_filtered (stream, " %*ld: %s", indent + 4, |
3949 | (long) (data - 1 - start), name); | |
9eae7c52 TT |
3950 | |
3951 | switch (op) | |
3952 | { | |
3953 | case DW_OP_addr: | |
d4a087c7 UW |
3954 | ul = extract_unsigned_integer (data, addr_size, |
3955 | gdbarch_byte_order (arch)); | |
9eae7c52 | 3956 | data += addr_size; |
d4a087c7 | 3957 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); |
9eae7c52 TT |
3958 | break; |
3959 | ||
3960 | case DW_OP_const1u: | |
3961 | ul = extract_unsigned_integer (data, 1, gdbarch_byte_order (arch)); | |
3962 | data += 1; | |
3963 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3964 | break; | |
3965 | case DW_OP_const1s: | |
3966 | l = extract_signed_integer (data, 1, gdbarch_byte_order (arch)); | |
3967 | data += 1; | |
3968 | fprintf_filtered (stream, " %s", plongest (l)); | |
3969 | break; | |
3970 | case DW_OP_const2u: | |
3971 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
3972 | data += 2; | |
3973 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3974 | break; | |
3975 | case DW_OP_const2s: | |
3976 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
3977 | data += 2; | |
3978 | fprintf_filtered (stream, " %s", plongest (l)); | |
3979 | break; | |
3980 | case DW_OP_const4u: | |
3981 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
3982 | data += 4; | |
3983 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3984 | break; | |
3985 | case DW_OP_const4s: | |
3986 | l = extract_signed_integer (data, 4, gdbarch_byte_order (arch)); | |
3987 | data += 4; | |
3988 | fprintf_filtered (stream, " %s", plongest (l)); | |
3989 | break; | |
3990 | case DW_OP_const8u: | |
3991 | ul = extract_unsigned_integer (data, 8, gdbarch_byte_order (arch)); | |
3992 | data += 8; | |
3993 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
3994 | break; | |
3995 | case DW_OP_const8s: | |
3996 | l = extract_signed_integer (data, 8, gdbarch_byte_order (arch)); | |
3997 | data += 8; | |
3998 | fprintf_filtered (stream, " %s", plongest (l)); | |
3999 | break; | |
4000 | case DW_OP_constu: | |
f664829e | 4001 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4002 | fprintf_filtered (stream, " %s", pulongest (ul)); |
4003 | break; | |
4004 | case DW_OP_consts: | |
f664829e | 4005 | data = safe_read_sleb128 (data, end, &l); |
9eae7c52 TT |
4006 | fprintf_filtered (stream, " %s", plongest (l)); |
4007 | break; | |
4008 | ||
4009 | case DW_OP_reg0: | |
4010 | case DW_OP_reg1: | |
4011 | case DW_OP_reg2: | |
4012 | case DW_OP_reg3: | |
4013 | case DW_OP_reg4: | |
4014 | case DW_OP_reg5: | |
4015 | case DW_OP_reg6: | |
4016 | case DW_OP_reg7: | |
4017 | case DW_OP_reg8: | |
4018 | case DW_OP_reg9: | |
4019 | case DW_OP_reg10: | |
4020 | case DW_OP_reg11: | |
4021 | case DW_OP_reg12: | |
4022 | case DW_OP_reg13: | |
4023 | case DW_OP_reg14: | |
4024 | case DW_OP_reg15: | |
4025 | case DW_OP_reg16: | |
4026 | case DW_OP_reg17: | |
4027 | case DW_OP_reg18: | |
4028 | case DW_OP_reg19: | |
4029 | case DW_OP_reg20: | |
4030 | case DW_OP_reg21: | |
4031 | case DW_OP_reg22: | |
4032 | case DW_OP_reg23: | |
4033 | case DW_OP_reg24: | |
4034 | case DW_OP_reg25: | |
4035 | case DW_OP_reg26: | |
4036 | case DW_OP_reg27: | |
4037 | case DW_OP_reg28: | |
4038 | case DW_OP_reg29: | |
4039 | case DW_OP_reg30: | |
4040 | case DW_OP_reg31: | |
4041 | fprintf_filtered (stream, " [$%s]", | |
5e44ecb3 | 4042 | locexpr_regname (arch, op - DW_OP_reg0)); |
9eae7c52 TT |
4043 | break; |
4044 | ||
4045 | case DW_OP_regx: | |
f664829e | 4046 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 | 4047 | fprintf_filtered (stream, " %s [$%s]", pulongest (ul), |
5e44ecb3 | 4048 | locexpr_regname (arch, (int) ul)); |
9eae7c52 TT |
4049 | break; |
4050 | ||
4051 | case DW_OP_implicit_value: | |
f664829e | 4052 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4053 | data += ul; |
4054 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4055 | break; | |
4056 | ||
4057 | case DW_OP_breg0: | |
4058 | case DW_OP_breg1: | |
4059 | case DW_OP_breg2: | |
4060 | case DW_OP_breg3: | |
4061 | case DW_OP_breg4: | |
4062 | case DW_OP_breg5: | |
4063 | case DW_OP_breg6: | |
4064 | case DW_OP_breg7: | |
4065 | case DW_OP_breg8: | |
4066 | case DW_OP_breg9: | |
4067 | case DW_OP_breg10: | |
4068 | case DW_OP_breg11: | |
4069 | case DW_OP_breg12: | |
4070 | case DW_OP_breg13: | |
4071 | case DW_OP_breg14: | |
4072 | case DW_OP_breg15: | |
4073 | case DW_OP_breg16: | |
4074 | case DW_OP_breg17: | |
4075 | case DW_OP_breg18: | |
4076 | case DW_OP_breg19: | |
4077 | case DW_OP_breg20: | |
4078 | case DW_OP_breg21: | |
4079 | case DW_OP_breg22: | |
4080 | case DW_OP_breg23: | |
4081 | case DW_OP_breg24: | |
4082 | case DW_OP_breg25: | |
4083 | case DW_OP_breg26: | |
4084 | case DW_OP_breg27: | |
4085 | case DW_OP_breg28: | |
4086 | case DW_OP_breg29: | |
4087 | case DW_OP_breg30: | |
4088 | case DW_OP_breg31: | |
f664829e | 4089 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 4090 | fprintf_filtered (stream, " %s [$%s]", plongest (l), |
5e44ecb3 | 4091 | locexpr_regname (arch, op - DW_OP_breg0)); |
9eae7c52 TT |
4092 | break; |
4093 | ||
4094 | case DW_OP_bregx: | |
f664829e DE |
4095 | data = safe_read_uleb128 (data, end, &ul); |
4096 | data = safe_read_sleb128 (data, end, &l); | |
0502ed8c JK |
4097 | fprintf_filtered (stream, " register %s [$%s] offset %s", |
4098 | pulongest (ul), | |
5e44ecb3 | 4099 | locexpr_regname (arch, (int) ul), |
0502ed8c | 4100 | plongest (l)); |
9eae7c52 TT |
4101 | break; |
4102 | ||
4103 | case DW_OP_fbreg: | |
f664829e | 4104 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 4105 | fprintf_filtered (stream, " %s", plongest (l)); |
9eae7c52 TT |
4106 | break; |
4107 | ||
4108 | case DW_OP_xderef_size: | |
4109 | case DW_OP_deref_size: | |
4110 | case DW_OP_pick: | |
4111 | fprintf_filtered (stream, " %d", *data); | |
4112 | ++data; | |
4113 | break; | |
4114 | ||
4115 | case DW_OP_plus_uconst: | |
f664829e | 4116 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4117 | fprintf_filtered (stream, " %s", pulongest (ul)); |
4118 | break; | |
4119 | ||
4120 | case DW_OP_skip: | |
4121 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4122 | data += 2; | |
4123 | fprintf_filtered (stream, " to %ld", | |
4124 | (long) (data + l - start)); | |
4125 | break; | |
4126 | ||
4127 | case DW_OP_bra: | |
4128 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4129 | data += 2; | |
4130 | fprintf_filtered (stream, " %ld", | |
4131 | (long) (data + l - start)); | |
4132 | break; | |
4133 | ||
4134 | case DW_OP_call2: | |
4135 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
4136 | data += 2; | |
4137 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 2)); | |
4138 | break; | |
4139 | ||
4140 | case DW_OP_call4: | |
4141 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4142 | data += 4; | |
4143 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4144 | break; | |
4145 | ||
4146 | case DW_OP_call_ref: | |
4147 | ul = extract_unsigned_integer (data, offset_size, | |
4148 | gdbarch_byte_order (arch)); | |
4149 | data += offset_size; | |
4150 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
4151 | break; | |
4152 | ||
4153 | case DW_OP_piece: | |
f664829e | 4154 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4155 | fprintf_filtered (stream, " %s (bytes)", pulongest (ul)); |
4156 | break; | |
4157 | ||
4158 | case DW_OP_bit_piece: | |
4159 | { | |
9fccedf7 | 4160 | uint64_t offset; |
9eae7c52 | 4161 | |
f664829e DE |
4162 | data = safe_read_uleb128 (data, end, &ul); |
4163 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4164 | fprintf_filtered (stream, " size %s offset %s (bits)", |
4165 | pulongest (ul), pulongest (offset)); | |
4166 | } | |
4167 | break; | |
8cf6f0b1 TT |
4168 | |
4169 | case DW_OP_GNU_implicit_pointer: | |
4170 | { | |
4171 | ul = extract_unsigned_integer (data, offset_size, | |
4172 | gdbarch_byte_order (arch)); | |
4173 | data += offset_size; | |
4174 | ||
f664829e | 4175 | data = safe_read_sleb128 (data, end, &l); |
8cf6f0b1 TT |
4176 | |
4177 | fprintf_filtered (stream, " DIE %s offset %s", | |
4178 | phex_nz (ul, offset_size), | |
4179 | plongest (l)); | |
4180 | } | |
4181 | break; | |
5e44ecb3 TT |
4182 | |
4183 | case DW_OP_GNU_deref_type: | |
4184 | { | |
4185 | int addr_size = *data++; | |
b64f50a1 | 4186 | cu_offset offset; |
5e44ecb3 TT |
4187 | struct type *type; |
4188 | ||
f664829e | 4189 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 4190 | offset.cu_off = ul; |
5e44ecb3 TT |
4191 | type = dwarf2_get_die_type (offset, per_cu); |
4192 | fprintf_filtered (stream, "<"); | |
4193 | type_print (type, "", stream, -1); | |
b64f50a1 | 4194 | fprintf_filtered (stream, " [0x%s]> %d", phex_nz (offset.cu_off, 0), |
5e44ecb3 TT |
4195 | addr_size); |
4196 | } | |
4197 | break; | |
4198 | ||
4199 | case DW_OP_GNU_const_type: | |
4200 | { | |
b64f50a1 | 4201 | cu_offset type_die; |
5e44ecb3 TT |
4202 | struct type *type; |
4203 | ||
f664829e | 4204 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 4205 | type_die.cu_off = ul; |
5e44ecb3 TT |
4206 | type = dwarf2_get_die_type (type_die, per_cu); |
4207 | fprintf_filtered (stream, "<"); | |
4208 | type_print (type, "", stream, -1); | |
b64f50a1 | 4209 | fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die.cu_off, 0)); |
5e44ecb3 TT |
4210 | } |
4211 | break; | |
4212 | ||
4213 | case DW_OP_GNU_regval_type: | |
4214 | { | |
9fccedf7 | 4215 | uint64_t reg; |
b64f50a1 | 4216 | cu_offset type_die; |
5e44ecb3 TT |
4217 | struct type *type; |
4218 | ||
f664829e DE |
4219 | data = safe_read_uleb128 (data, end, ®); |
4220 | data = safe_read_uleb128 (data, end, &ul); | |
b64f50a1 | 4221 | type_die.cu_off = ul; |
5e44ecb3 TT |
4222 | |
4223 | type = dwarf2_get_die_type (type_die, per_cu); | |
4224 | fprintf_filtered (stream, "<"); | |
4225 | type_print (type, "", stream, -1); | |
b64f50a1 JK |
4226 | fprintf_filtered (stream, " [0x%s]> [$%s]", |
4227 | phex_nz (type_die.cu_off, 0), | |
5e44ecb3 TT |
4228 | locexpr_regname (arch, reg)); |
4229 | } | |
4230 | break; | |
4231 | ||
4232 | case DW_OP_GNU_convert: | |
4233 | case DW_OP_GNU_reinterpret: | |
4234 | { | |
b64f50a1 | 4235 | cu_offset type_die; |
5e44ecb3 | 4236 | |
f664829e | 4237 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 4238 | type_die.cu_off = ul; |
5e44ecb3 | 4239 | |
b64f50a1 | 4240 | if (type_die.cu_off == 0) |
5e44ecb3 TT |
4241 | fprintf_filtered (stream, "<0>"); |
4242 | else | |
4243 | { | |
4244 | struct type *type; | |
4245 | ||
4246 | type = dwarf2_get_die_type (type_die, per_cu); | |
4247 | fprintf_filtered (stream, "<"); | |
4248 | type_print (type, "", stream, -1); | |
b64f50a1 | 4249 | fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die.cu_off, 0)); |
5e44ecb3 TT |
4250 | } |
4251 | } | |
4252 | break; | |
2bda9cc5 JK |
4253 | |
4254 | case DW_OP_GNU_entry_value: | |
f664829e | 4255 | data = safe_read_uleb128 (data, end, &ul); |
2bda9cc5 JK |
4256 | fputc_filtered ('\n', stream); |
4257 | disassemble_dwarf_expression (stream, arch, addr_size, offset_size, | |
4258 | start, data, data + ul, indent + 2, | |
4259 | all, per_cu); | |
4260 | data += ul; | |
4261 | continue; | |
49f6c839 | 4262 | |
a24f71ab JK |
4263 | case DW_OP_GNU_parameter_ref: |
4264 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4265 | data += 4; | |
4266 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4267 | break; | |
4268 | ||
49f6c839 DE |
4269 | case DW_OP_GNU_addr_index: |
4270 | data = safe_read_uleb128 (data, end, &ul); | |
4271 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4272 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); | |
4273 | break; | |
4274 | case DW_OP_GNU_const_index: | |
4275 | data = safe_read_uleb128 (data, end, &ul); | |
4276 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4277 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4278 | break; | |
9eae7c52 TT |
4279 | } |
4280 | ||
4281 | fprintf_filtered (stream, "\n"); | |
4282 | } | |
c3228f12 | 4283 | |
08922a10 | 4284 | return data; |
4c2df51b DJ |
4285 | } |
4286 | ||
08922a10 SS |
4287 | /* Describe a single location, which may in turn consist of multiple |
4288 | pieces. */ | |
a55cc764 | 4289 | |
08922a10 SS |
4290 | static void |
4291 | locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr, | |
0d45f56e | 4292 | struct ui_file *stream, |
56eb65bd | 4293 | const gdb_byte *data, size_t size, |
9eae7c52 | 4294 | struct objfile *objfile, unsigned int addr_size, |
5e44ecb3 | 4295 | int offset_size, struct dwarf2_per_cu_data *per_cu) |
08922a10 | 4296 | { |
0d45f56e | 4297 | const gdb_byte *end = data + size; |
9eae7c52 | 4298 | int first_piece = 1, bad = 0; |
08922a10 | 4299 | |
08922a10 SS |
4300 | while (data < end) |
4301 | { | |
9eae7c52 TT |
4302 | const gdb_byte *here = data; |
4303 | int disassemble = 1; | |
4304 | ||
4305 | if (first_piece) | |
4306 | first_piece = 0; | |
4307 | else | |
4308 | fprintf_filtered (stream, _(", and ")); | |
08922a10 | 4309 | |
b4f54984 | 4310 | if (!dwarf_always_disassemble) |
9eae7c52 | 4311 | { |
3e43a32a | 4312 | data = locexpr_describe_location_piece (symbol, stream, |
49f6c839 | 4313 | addr, objfile, per_cu, |
9eae7c52 TT |
4314 | data, end, addr_size); |
4315 | /* If we printed anything, or if we have an empty piece, | |
4316 | then don't disassemble. */ | |
4317 | if (data != here | |
4318 | || data[0] == DW_OP_piece | |
4319 | || data[0] == DW_OP_bit_piece) | |
4320 | disassemble = 0; | |
08922a10 | 4321 | } |
9eae7c52 | 4322 | if (disassemble) |
2bda9cc5 JK |
4323 | { |
4324 | fprintf_filtered (stream, _("a complex DWARF expression:\n")); | |
4325 | data = disassemble_dwarf_expression (stream, | |
4326 | get_objfile_arch (objfile), | |
4327 | addr_size, offset_size, data, | |
4328 | data, end, 0, | |
b4f54984 | 4329 | dwarf_always_disassemble, |
2bda9cc5 JK |
4330 | per_cu); |
4331 | } | |
9eae7c52 TT |
4332 | |
4333 | if (data < end) | |
08922a10 | 4334 | { |
9eae7c52 | 4335 | int empty = data == here; |
08922a10 | 4336 | |
9eae7c52 TT |
4337 | if (disassemble) |
4338 | fprintf_filtered (stream, " "); | |
4339 | if (data[0] == DW_OP_piece) | |
4340 | { | |
9fccedf7 | 4341 | uint64_t bytes; |
08922a10 | 4342 | |
f664829e | 4343 | data = safe_read_uleb128 (data + 1, end, &bytes); |
08922a10 | 4344 | |
9eae7c52 TT |
4345 | if (empty) |
4346 | fprintf_filtered (stream, _("an empty %s-byte piece"), | |
4347 | pulongest (bytes)); | |
4348 | else | |
4349 | fprintf_filtered (stream, _(" [%s-byte piece]"), | |
4350 | pulongest (bytes)); | |
4351 | } | |
4352 | else if (data[0] == DW_OP_bit_piece) | |
4353 | { | |
9fccedf7 | 4354 | uint64_t bits, offset; |
9eae7c52 | 4355 | |
f664829e DE |
4356 | data = safe_read_uleb128 (data + 1, end, &bits); |
4357 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4358 | |
4359 | if (empty) | |
4360 | fprintf_filtered (stream, | |
4361 | _("an empty %s-bit piece"), | |
4362 | pulongest (bits)); | |
4363 | else | |
4364 | fprintf_filtered (stream, | |
4365 | _(" [%s-bit piece, offset %s bits]"), | |
4366 | pulongest (bits), pulongest (offset)); | |
4367 | } | |
4368 | else | |
4369 | { | |
4370 | bad = 1; | |
4371 | break; | |
4372 | } | |
08922a10 SS |
4373 | } |
4374 | } | |
4375 | ||
4376 | if (bad || data > end) | |
4377 | error (_("Corrupted DWARF2 expression for \"%s\"."), | |
4378 | SYMBOL_PRINT_NAME (symbol)); | |
4379 | } | |
4380 | ||
4381 | /* Print a natural-language description of SYMBOL to STREAM. This | |
4382 | version is for a symbol with a single location. */ | |
a55cc764 | 4383 | |
08922a10 SS |
4384 | static void |
4385 | locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4386 | struct ui_file *stream) | |
4387 | { | |
9a3c8263 SM |
4388 | struct dwarf2_locexpr_baton *dlbaton |
4389 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
08922a10 SS |
4390 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4391 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4392 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
08922a10 | 4393 | |
3e43a32a MS |
4394 | locexpr_describe_location_1 (symbol, addr, stream, |
4395 | dlbaton->data, dlbaton->size, | |
5e44ecb3 TT |
4396 | objfile, addr_size, offset_size, |
4397 | dlbaton->per_cu); | |
08922a10 SS |
4398 | } |
4399 | ||
4400 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4401 | any necessary bytecode in AX. */ | |
a55cc764 | 4402 | |
0d53c4c4 | 4403 | static void |
505e835d UW |
4404 | locexpr_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch, |
4405 | struct agent_expr *ax, struct axs_value *value) | |
a55cc764 | 4406 | { |
9a3c8263 SM |
4407 | struct dwarf2_locexpr_baton *dlbaton |
4408 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
3cf03773 | 4409 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
a55cc764 | 4410 | |
1d6edc3c | 4411 | if (dlbaton->size == 0) |
cabe9ab6 PA |
4412 | value->optimized_out = 1; |
4413 | else | |
9f6f94ff TT |
4414 | dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, |
4415 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4416 | dlbaton->per_cu); | |
a55cc764 DJ |
4417 | } |
4418 | ||
bb2ec1b3 TT |
4419 | /* symbol_computed_ops 'generate_c_location' method. */ |
4420 | ||
4421 | static void | |
4422 | locexpr_generate_c_location (struct symbol *sym, struct ui_file *stream, | |
4423 | struct gdbarch *gdbarch, | |
4424 | unsigned char *registers_used, | |
4425 | CORE_ADDR pc, const char *result_name) | |
4426 | { | |
9a3c8263 SM |
4427 | struct dwarf2_locexpr_baton *dlbaton |
4428 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (sym); | |
bb2ec1b3 TT |
4429 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
4430 | ||
4431 | if (dlbaton->size == 0) | |
4432 | error (_("symbol \"%s\" is optimized out"), SYMBOL_NATURAL_NAME (sym)); | |
4433 | ||
4434 | compile_dwarf_expr_to_c (stream, result_name, | |
4435 | sym, pc, gdbarch, registers_used, addr_size, | |
4436 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4437 | dlbaton->per_cu); | |
4438 | } | |
4439 | ||
4c2df51b DJ |
4440 | /* The set of location functions used with the DWARF-2 expression |
4441 | evaluator. */ | |
768a979c | 4442 | const struct symbol_computed_ops dwarf2_locexpr_funcs = { |
4c2df51b | 4443 | locexpr_read_variable, |
e18b2753 | 4444 | locexpr_read_variable_at_entry, |
0b31a4bc | 4445 | locexpr_get_symbol_read_needs, |
4c2df51b | 4446 | locexpr_describe_location, |
f1e6e072 | 4447 | 0, /* location_has_loclist */ |
bb2ec1b3 TT |
4448 | locexpr_tracepoint_var_ref, |
4449 | locexpr_generate_c_location | |
4c2df51b | 4450 | }; |
0d53c4c4 DJ |
4451 | |
4452 | ||
4453 | /* Wrapper functions for location lists. These generally find | |
4454 | the appropriate location expression and call something above. */ | |
4455 | ||
4456 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
4457 | evaluator to calculate the location. */ | |
4458 | static struct value * | |
4459 | loclist_read_variable (struct symbol *symbol, struct frame_info *frame) | |
4460 | { | |
9a3c8263 SM |
4461 | struct dwarf2_loclist_baton *dlbaton |
4462 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
0d53c4c4 | 4463 | struct value *val; |
947bb88f | 4464 | const gdb_byte *data; |
b6b08ebf | 4465 | size_t size; |
8cf6f0b1 | 4466 | CORE_ADDR pc = frame ? get_frame_address_in_block (frame) : 0; |
0d53c4c4 | 4467 | |
8cf6f0b1 | 4468 | data = dwarf2_find_location_expression (dlbaton, &size, pc); |
1d6edc3c JK |
4469 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, data, size, |
4470 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4471 | |
4472 | return val; | |
4473 | } | |
4474 | ||
e18b2753 JK |
4475 | /* Read variable SYMBOL like loclist_read_variable at (callee) FRAME's function |
4476 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
4477 | will be thrown. | |
4478 | ||
4479 | Function always returns non-NULL value, it may be marked optimized out if | |
4480 | inferior frame information is not available. It throws NO_ENTRY_VALUE_ERROR | |
4481 | if it cannot resolve the parameter for any reason. */ | |
4482 | ||
4483 | static struct value * | |
4484 | loclist_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
4485 | { | |
9a3c8263 SM |
4486 | struct dwarf2_loclist_baton *dlbaton |
4487 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
4488 | const gdb_byte *data; |
4489 | size_t size; | |
4490 | CORE_ADDR pc; | |
4491 | ||
4492 | if (frame == NULL || !get_frame_func_if_available (frame, &pc)) | |
4493 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4494 | ||
4495 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4496 | if (data == NULL) | |
4497 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4498 | ||
4499 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, data, size); | |
4500 | } | |
4501 | ||
0b31a4bc TT |
4502 | /* Implementation of get_symbol_read_needs from |
4503 | symbol_computed_ops. */ | |
4504 | ||
4505 | static enum symbol_needs_kind | |
4506 | loclist_symbol_needs (struct symbol *symbol) | |
0d53c4c4 DJ |
4507 | { |
4508 | /* If there's a location list, then assume we need to have a frame | |
4509 | to choose the appropriate location expression. With tracking of | |
4510 | global variables this is not necessarily true, but such tracking | |
4511 | is disabled in GCC at the moment until we figure out how to | |
4512 | represent it. */ | |
4513 | ||
0b31a4bc | 4514 | return SYMBOL_NEEDS_FRAME; |
0d53c4c4 DJ |
4515 | } |
4516 | ||
08922a10 SS |
4517 | /* Print a natural-language description of SYMBOL to STREAM. This |
4518 | version applies when there is a list of different locations, each | |
4519 | with a specified address range. */ | |
4520 | ||
4521 | static void | |
4522 | loclist_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4523 | struct ui_file *stream) | |
0d53c4c4 | 4524 | { |
9a3c8263 SM |
4525 | struct dwarf2_loclist_baton *dlbaton |
4526 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4527 | const gdb_byte *loc_ptr, *buf_end; |
08922a10 SS |
4528 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4529 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
4530 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
4531 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4532 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
d4a087c7 | 4533 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
08922a10 | 4534 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 4535 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); |
08922a10 | 4536 | CORE_ADDR base_address = dlbaton->base_address + base_offset; |
f664829e | 4537 | int done = 0; |
08922a10 SS |
4538 | |
4539 | loc_ptr = dlbaton->data; | |
4540 | buf_end = dlbaton->data + dlbaton->size; | |
4541 | ||
9eae7c52 | 4542 | fprintf_filtered (stream, _("multi-location:\n")); |
08922a10 SS |
4543 | |
4544 | /* Iterate through locations until we run out. */ | |
f664829e | 4545 | while (!done) |
08922a10 | 4546 | { |
f664829e DE |
4547 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
4548 | int length; | |
4549 | enum debug_loc_kind kind; | |
4550 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
4551 | ||
4552 | if (dlbaton->from_dwo) | |
4553 | kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu, | |
4554 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 4555 | &low, &high, byte_order); |
d4a087c7 | 4556 | else |
f664829e DE |
4557 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
4558 | &low, &high, | |
4559 | byte_order, addr_size, | |
4560 | signed_addr_p); | |
4561 | loc_ptr = new_ptr; | |
4562 | switch (kind) | |
08922a10 | 4563 | { |
f664829e DE |
4564 | case DEBUG_LOC_END_OF_LIST: |
4565 | done = 1; | |
4566 | continue; | |
4567 | case DEBUG_LOC_BASE_ADDRESS: | |
d4a087c7 | 4568 | base_address = high + base_offset; |
9eae7c52 | 4569 | fprintf_filtered (stream, _(" Base address %s"), |
08922a10 | 4570 | paddress (gdbarch, base_address)); |
08922a10 | 4571 | continue; |
3771a44c DE |
4572 | case DEBUG_LOC_START_END: |
4573 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
4574 | break; |
4575 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
4576 | case DEBUG_LOC_INVALID_ENTRY: | |
4577 | error (_("Corrupted DWARF expression for symbol \"%s\"."), | |
4578 | SYMBOL_PRINT_NAME (symbol)); | |
4579 | default: | |
4580 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
08922a10 SS |
4581 | } |
4582 | ||
08922a10 SS |
4583 | /* Otherwise, a location expression entry. */ |
4584 | low += base_address; | |
4585 | high += base_address; | |
4586 | ||
3e29f34a MR |
4587 | low = gdbarch_adjust_dwarf2_addr (gdbarch, low); |
4588 | high = gdbarch_adjust_dwarf2_addr (gdbarch, high); | |
4589 | ||
08922a10 SS |
4590 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); |
4591 | loc_ptr += 2; | |
4592 | ||
08922a10 SS |
4593 | /* (It would improve readability to print only the minimum |
4594 | necessary digits of the second number of the range.) */ | |
9eae7c52 | 4595 | fprintf_filtered (stream, _(" Range %s-%s: "), |
08922a10 SS |
4596 | paddress (gdbarch, low), paddress (gdbarch, high)); |
4597 | ||
4598 | /* Now describe this particular location. */ | |
4599 | locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length, | |
5e44ecb3 TT |
4600 | objfile, addr_size, offset_size, |
4601 | dlbaton->per_cu); | |
9eae7c52 TT |
4602 | |
4603 | fprintf_filtered (stream, "\n"); | |
08922a10 SS |
4604 | |
4605 | loc_ptr += length; | |
4606 | } | |
0d53c4c4 DJ |
4607 | } |
4608 | ||
4609 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4610 | any necessary bytecode in AX. */ | |
4611 | static void | |
505e835d UW |
4612 | loclist_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch, |
4613 | struct agent_expr *ax, struct axs_value *value) | |
0d53c4c4 | 4614 | { |
9a3c8263 SM |
4615 | struct dwarf2_loclist_baton *dlbaton |
4616 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4617 | const gdb_byte *data; |
b6b08ebf | 4618 | size_t size; |
3cf03773 | 4619 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
0d53c4c4 | 4620 | |
8cf6f0b1 | 4621 | data = dwarf2_find_location_expression (dlbaton, &size, ax->scope); |
1d6edc3c | 4622 | if (size == 0) |
cabe9ab6 PA |
4623 | value->optimized_out = 1; |
4624 | else | |
9f6f94ff TT |
4625 | dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, data, data + size, |
4626 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4627 | } |
4628 | ||
bb2ec1b3 TT |
4629 | /* symbol_computed_ops 'generate_c_location' method. */ |
4630 | ||
4631 | static void | |
4632 | loclist_generate_c_location (struct symbol *sym, struct ui_file *stream, | |
4633 | struct gdbarch *gdbarch, | |
4634 | unsigned char *registers_used, | |
4635 | CORE_ADDR pc, const char *result_name) | |
4636 | { | |
9a3c8263 SM |
4637 | struct dwarf2_loclist_baton *dlbaton |
4638 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (sym); | |
bb2ec1b3 TT |
4639 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
4640 | const gdb_byte *data; | |
4641 | size_t size; | |
4642 | ||
4643 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4644 | if (size == 0) | |
4645 | error (_("symbol \"%s\" is optimized out"), SYMBOL_NATURAL_NAME (sym)); | |
4646 | ||
4647 | compile_dwarf_expr_to_c (stream, result_name, | |
4648 | sym, pc, gdbarch, registers_used, addr_size, | |
4649 | data, data + size, | |
4650 | dlbaton->per_cu); | |
4651 | } | |
4652 | ||
0d53c4c4 DJ |
4653 | /* The set of location functions used with the DWARF-2 expression |
4654 | evaluator and location lists. */ | |
768a979c | 4655 | const struct symbol_computed_ops dwarf2_loclist_funcs = { |
0d53c4c4 | 4656 | loclist_read_variable, |
e18b2753 | 4657 | loclist_read_variable_at_entry, |
0b31a4bc | 4658 | loclist_symbol_needs, |
0d53c4c4 | 4659 | loclist_describe_location, |
f1e6e072 | 4660 | 1, /* location_has_loclist */ |
bb2ec1b3 TT |
4661 | loclist_tracepoint_var_ref, |
4662 | loclist_generate_c_location | |
0d53c4c4 | 4663 | }; |
8e3b41a9 | 4664 | |
70221824 PA |
4665 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
4666 | extern initialize_file_ftype _initialize_dwarf2loc; | |
4667 | ||
8e3b41a9 JK |
4668 | void |
4669 | _initialize_dwarf2loc (void) | |
4670 | { | |
ccce17b0 YQ |
4671 | add_setshow_zuinteger_cmd ("entry-values", class_maintenance, |
4672 | &entry_values_debug, | |
4673 | _("Set entry values and tail call frames " | |
4674 | "debugging."), | |
4675 | _("Show entry values and tail call frames " | |
4676 | "debugging."), | |
4677 | _("When non-zero, the process of determining " | |
4678 | "parameter values from function entry point " | |
4679 | "and tail call frames will be printed."), | |
4680 | NULL, | |
4681 | show_entry_values_debug, | |
4682 | &setdebuglist, &showdebuglist); | |
ad06383f AA |
4683 | |
4684 | #if GDB_SELF_TEST | |
4685 | register_self_test (selftests::copy_bitwise_tests); | |
4686 | #endif | |
8e3b41a9 | 4687 | } |