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" |
325fac50 | 41 | #include <algorithm> |
4c2df51b | 42 | |
b4f54984 | 43 | extern int dwarf_always_disassemble; |
9eae7c52 | 44 | |
e36122e9 | 45 | extern const struct dwarf_expr_context_funcs dwarf_expr_ctx_funcs; |
8e3b41a9 | 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 | |
f664829e DE |
54 | /* Until these have formal names, we define these here. |
55 | ref: http://gcc.gnu.org/wiki/DebugFission | |
56 | Each entry in .debug_loc.dwo begins with a byte that describes the entry, | |
57 | and is then followed by data specific to that entry. */ | |
58 | ||
59 | enum debug_loc_kind | |
60 | { | |
61 | /* Indicates the end of the list of entries. */ | |
62 | DEBUG_LOC_END_OF_LIST = 0, | |
63 | ||
64 | /* This is followed by an unsigned LEB128 number that is an index into | |
65 | .debug_addr and specifies the base address for all following entries. */ | |
66 | DEBUG_LOC_BASE_ADDRESS = 1, | |
67 | ||
68 | /* This is followed by two unsigned LEB128 numbers that are indices into | |
69 | .debug_addr and specify the beginning and ending addresses, and then | |
70 | a normal location expression as in .debug_loc. */ | |
3771a44c DE |
71 | DEBUG_LOC_START_END = 2, |
72 | ||
73 | /* This is followed by an unsigned LEB128 number that is an index into | |
74 | .debug_addr and specifies the beginning address, and a 4 byte unsigned | |
75 | number that specifies the length, and then a normal location expression | |
76 | as in .debug_loc. */ | |
77 | DEBUG_LOC_START_LENGTH = 3, | |
f664829e DE |
78 | |
79 | /* An internal value indicating there is insufficient data. */ | |
80 | DEBUG_LOC_BUFFER_OVERFLOW = -1, | |
81 | ||
82 | /* An internal value indicating an invalid kind of entry was found. */ | |
83 | DEBUG_LOC_INVALID_ENTRY = -2 | |
84 | }; | |
85 | ||
b6807d98 TT |
86 | /* Helper function which throws an error if a synthetic pointer is |
87 | invalid. */ | |
88 | ||
89 | static void | |
90 | invalid_synthetic_pointer (void) | |
91 | { | |
92 | error (_("access outside bounds of object " | |
93 | "referenced via synthetic pointer")); | |
94 | } | |
95 | ||
f664829e DE |
96 | /* Decode the addresses in a non-dwo .debug_loc entry. |
97 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
98 | The encoded low,high addresses are return in *LOW,*HIGH. | |
99 | The result indicates the kind of entry found. */ | |
100 | ||
101 | static enum debug_loc_kind | |
102 | decode_debug_loc_addresses (const gdb_byte *loc_ptr, const gdb_byte *buf_end, | |
103 | const gdb_byte **new_ptr, | |
104 | CORE_ADDR *low, CORE_ADDR *high, | |
105 | enum bfd_endian byte_order, | |
106 | unsigned int addr_size, | |
107 | int signed_addr_p) | |
108 | { | |
109 | CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); | |
110 | ||
111 | if (buf_end - loc_ptr < 2 * addr_size) | |
112 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
113 | ||
114 | if (signed_addr_p) | |
115 | *low = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
116 | else | |
117 | *low = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
118 | loc_ptr += addr_size; | |
119 | ||
120 | if (signed_addr_p) | |
121 | *high = extract_signed_integer (loc_ptr, addr_size, byte_order); | |
122 | else | |
123 | *high = extract_unsigned_integer (loc_ptr, addr_size, byte_order); | |
124 | loc_ptr += addr_size; | |
125 | ||
126 | *new_ptr = loc_ptr; | |
127 | ||
128 | /* A base-address-selection entry. */ | |
129 | if ((*low & base_mask) == base_mask) | |
130 | return DEBUG_LOC_BASE_ADDRESS; | |
131 | ||
132 | /* An end-of-list entry. */ | |
133 | if (*low == 0 && *high == 0) | |
134 | return DEBUG_LOC_END_OF_LIST; | |
135 | ||
3771a44c | 136 | return DEBUG_LOC_START_END; |
f664829e DE |
137 | } |
138 | ||
139 | /* Decode the addresses in .debug_loc.dwo entry. | |
140 | A pointer to the next byte to examine is returned in *NEW_PTR. | |
141 | The encoded low,high addresses are return in *LOW,*HIGH. | |
142 | The result indicates the kind of entry found. */ | |
143 | ||
144 | static enum debug_loc_kind | |
145 | decode_debug_loc_dwo_addresses (struct dwarf2_per_cu_data *per_cu, | |
146 | const gdb_byte *loc_ptr, | |
147 | const gdb_byte *buf_end, | |
148 | const gdb_byte **new_ptr, | |
3771a44c DE |
149 | CORE_ADDR *low, CORE_ADDR *high, |
150 | enum bfd_endian byte_order) | |
f664829e | 151 | { |
9fccedf7 | 152 | uint64_t low_index, high_index; |
f664829e DE |
153 | |
154 | if (loc_ptr == buf_end) | |
155 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
156 | ||
157 | switch (*loc_ptr++) | |
158 | { | |
159 | case DEBUG_LOC_END_OF_LIST: | |
160 | *new_ptr = loc_ptr; | |
161 | return DEBUG_LOC_END_OF_LIST; | |
162 | case DEBUG_LOC_BASE_ADDRESS: | |
163 | *low = 0; | |
164 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
165 | if (loc_ptr == NULL) | |
166 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
167 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
168 | *new_ptr = loc_ptr; | |
169 | return DEBUG_LOC_BASE_ADDRESS; | |
3771a44c | 170 | case DEBUG_LOC_START_END: |
f664829e DE |
171 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); |
172 | if (loc_ptr == NULL) | |
173 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
174 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
175 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &high_index); | |
176 | if (loc_ptr == NULL) | |
177 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
178 | *high = dwarf2_read_addr_index (per_cu, high_index); | |
179 | *new_ptr = loc_ptr; | |
3771a44c DE |
180 | return DEBUG_LOC_START_END; |
181 | case DEBUG_LOC_START_LENGTH: | |
182 | loc_ptr = gdb_read_uleb128 (loc_ptr, buf_end, &low_index); | |
183 | if (loc_ptr == NULL) | |
184 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
185 | *low = dwarf2_read_addr_index (per_cu, low_index); | |
186 | if (loc_ptr + 4 > buf_end) | |
187 | return DEBUG_LOC_BUFFER_OVERFLOW; | |
188 | *high = *low; | |
189 | *high += extract_unsigned_integer (loc_ptr, 4, byte_order); | |
190 | *new_ptr = loc_ptr + 4; | |
191 | return DEBUG_LOC_START_LENGTH; | |
f664829e DE |
192 | default: |
193 | return DEBUG_LOC_INVALID_ENTRY; | |
194 | } | |
195 | } | |
196 | ||
8cf6f0b1 | 197 | /* A function for dealing with location lists. Given a |
0d53c4c4 DJ |
198 | symbol baton (BATON) and a pc value (PC), find the appropriate |
199 | location expression, set *LOCEXPR_LENGTH, and return a pointer | |
200 | to the beginning of the expression. Returns NULL on failure. | |
201 | ||
202 | For now, only return the first matching location expression; there | |
203 | can be more than one in the list. */ | |
204 | ||
8cf6f0b1 TT |
205 | const gdb_byte * |
206 | dwarf2_find_location_expression (struct dwarf2_loclist_baton *baton, | |
207 | size_t *locexpr_length, CORE_ADDR pc) | |
0d53c4c4 | 208 | { |
ae0d2f24 | 209 | struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu); |
f7fd4728 | 210 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
e17a4113 | 211 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
ae0d2f24 | 212 | unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu); |
d4a087c7 | 213 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
8edfa926 | 214 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 215 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (baton->per_cu); |
8edfa926 | 216 | CORE_ADDR base_address = baton->base_address + base_offset; |
f664829e | 217 | const gdb_byte *loc_ptr, *buf_end; |
0d53c4c4 DJ |
218 | |
219 | loc_ptr = baton->data; | |
220 | buf_end = baton->data + baton->size; | |
221 | ||
222 | while (1) | |
223 | { | |
f664829e DE |
224 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
225 | int length; | |
226 | enum debug_loc_kind kind; | |
227 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
228 | ||
229 | if (baton->from_dwo) | |
230 | kind = decode_debug_loc_dwo_addresses (baton->per_cu, | |
231 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 232 | &low, &high, byte_order); |
d4a087c7 | 233 | else |
f664829e DE |
234 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
235 | &low, &high, | |
236 | byte_order, addr_size, | |
237 | signed_addr_p); | |
238 | loc_ptr = new_ptr; | |
239 | switch (kind) | |
1d6edc3c | 240 | { |
f664829e | 241 | case DEBUG_LOC_END_OF_LIST: |
1d6edc3c JK |
242 | *locexpr_length = 0; |
243 | return NULL; | |
f664829e DE |
244 | case DEBUG_LOC_BASE_ADDRESS: |
245 | base_address = high + base_offset; | |
246 | continue; | |
3771a44c DE |
247 | case DEBUG_LOC_START_END: |
248 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
249 | break; |
250 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
251 | case DEBUG_LOC_INVALID_ENTRY: | |
252 | error (_("dwarf2_find_location_expression: " | |
253 | "Corrupted DWARF expression.")); | |
254 | default: | |
255 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
1d6edc3c | 256 | } |
b5758fe4 | 257 | |
bed911e5 | 258 | /* Otherwise, a location expression entry. |
8ddd5a6c DE |
259 | If the entry is from a DWO, don't add base address: the entry is from |
260 | .debug_addr which already has the DWARF "base address". We still add | |
261 | base_offset in case we're debugging a PIE executable. */ | |
262 | if (baton->from_dwo) | |
263 | { | |
264 | low += base_offset; | |
265 | high += base_offset; | |
266 | } | |
267 | else | |
bed911e5 DE |
268 | { |
269 | low += base_address; | |
270 | high += base_address; | |
271 | } | |
0d53c4c4 | 272 | |
e17a4113 | 273 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); |
0d53c4c4 DJ |
274 | loc_ptr += 2; |
275 | ||
e18b2753 JK |
276 | if (low == high && pc == low) |
277 | { | |
278 | /* This is entry PC record present only at entry point | |
279 | of a function. Verify it is really the function entry point. */ | |
280 | ||
3977b71f | 281 | const struct block *pc_block = block_for_pc (pc); |
e18b2753 JK |
282 | struct symbol *pc_func = NULL; |
283 | ||
284 | if (pc_block) | |
285 | pc_func = block_linkage_function (pc_block); | |
286 | ||
287 | if (pc_func && pc == BLOCK_START (SYMBOL_BLOCK_VALUE (pc_func))) | |
288 | { | |
289 | *locexpr_length = length; | |
290 | return loc_ptr; | |
291 | } | |
292 | } | |
293 | ||
0d53c4c4 DJ |
294 | if (pc >= low && pc < high) |
295 | { | |
296 | *locexpr_length = length; | |
297 | return loc_ptr; | |
298 | } | |
299 | ||
300 | loc_ptr += length; | |
301 | } | |
302 | } | |
303 | ||
4c2df51b DJ |
304 | /* This is the baton used when performing dwarf2 expression |
305 | evaluation. */ | |
306 | struct dwarf_expr_baton | |
307 | { | |
308 | struct frame_info *frame; | |
17ea53c3 | 309 | struct dwarf2_per_cu_data *per_cu; |
08412b07 | 310 | CORE_ADDR obj_address; |
4c2df51b DJ |
311 | }; |
312 | ||
313 | /* Helper functions for dwarf2_evaluate_loc_desc. */ | |
314 | ||
4bc9efe1 | 315 | /* Using the frame specified in BATON, return the value of register |
0b2b0195 | 316 | REGNUM, treated as a pointer. */ |
4c2df51b | 317 | static CORE_ADDR |
b1370418 | 318 | dwarf_expr_read_addr_from_reg (void *baton, int dwarf_regnum) |
4c2df51b | 319 | { |
4c2df51b | 320 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; |
5e2b427d | 321 | struct gdbarch *gdbarch = get_frame_arch (debaton->frame); |
0fde2c53 | 322 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); |
e4adbba9 | 323 | |
2ed3c037 | 324 | return address_from_register (regnum, debaton->frame); |
4c2df51b DJ |
325 | } |
326 | ||
0acf8b65 JB |
327 | /* Implement struct dwarf_expr_context_funcs' "get_reg_value" callback. */ |
328 | ||
329 | static struct value * | |
330 | dwarf_expr_get_reg_value (void *baton, struct type *type, int dwarf_regnum) | |
331 | { | |
332 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
333 | struct gdbarch *gdbarch = get_frame_arch (debaton->frame); | |
0fde2c53 | 334 | int regnum = dwarf_reg_to_regnum_or_error (gdbarch, dwarf_regnum); |
0acf8b65 JB |
335 | |
336 | return value_from_register (type, regnum, debaton->frame); | |
337 | } | |
338 | ||
4c2df51b DJ |
339 | /* Read memory at ADDR (length LEN) into BUF. */ |
340 | ||
341 | static void | |
852483bc | 342 | dwarf_expr_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
4c2df51b DJ |
343 | { |
344 | read_memory (addr, buf, len); | |
345 | } | |
346 | ||
347 | /* Using the frame specified in BATON, find the location expression | |
348 | describing the frame base. Return a pointer to it in START and | |
349 | its length in LENGTH. */ | |
350 | static void | |
0d45f56e | 351 | dwarf_expr_frame_base (void *baton, const gdb_byte **start, size_t * length) |
4c2df51b | 352 | { |
da62e633 AC |
353 | /* FIXME: cagney/2003-03-26: This code should be using |
354 | get_frame_base_address(), and then implement a dwarf2 specific | |
355 | this_base method. */ | |
4c2df51b | 356 | struct symbol *framefunc; |
4c2df51b | 357 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; |
3977b71f | 358 | const struct block *bl = get_frame_block (debaton->frame, NULL); |
c90a0773 HZ |
359 | |
360 | if (bl == NULL) | |
361 | error (_("frame address is not available.")); | |
0d53c4c4 | 362 | |
edb3359d DJ |
363 | /* Use block_linkage_function, which returns a real (not inlined) |
364 | function, instead of get_frame_function, which may return an | |
365 | inlined function. */ | |
c90a0773 | 366 | framefunc = block_linkage_function (bl); |
0d53c4c4 | 367 | |
eff4f95e JG |
368 | /* If we found a frame-relative symbol then it was certainly within |
369 | some function associated with a frame. If we can't find the frame, | |
370 | something has gone wrong. */ | |
371 | gdb_assert (framefunc != NULL); | |
372 | ||
af945b75 TT |
373 | func_get_frame_base_dwarf_block (framefunc, |
374 | get_frame_address_in_block (debaton->frame), | |
375 | start, length); | |
0936ad1d SS |
376 | } |
377 | ||
f1e6e072 TT |
378 | /* Implement find_frame_base_location method for LOC_BLOCK functions using |
379 | DWARF expression for its DW_AT_frame_base. */ | |
380 | ||
381 | static void | |
382 | locexpr_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
383 | const gdb_byte **start, size_t *length) | |
384 | { | |
9a3c8263 SM |
385 | struct dwarf2_locexpr_baton *symbaton |
386 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
387 | |
388 | *length = symbaton->size; | |
389 | *start = symbaton->data; | |
390 | } | |
391 | ||
7d1c9c9b JB |
392 | /* Implement the struct symbol_block_ops::get_frame_base method for |
393 | LOC_BLOCK functions using a DWARF expression as its DW_AT_frame_base. */ | |
63e43d3a PMR |
394 | |
395 | static CORE_ADDR | |
7d1c9c9b | 396 | locexpr_get_frame_base (struct symbol *framefunc, struct frame_info *frame) |
63e43d3a PMR |
397 | { |
398 | struct gdbarch *gdbarch; | |
399 | struct type *type; | |
400 | struct dwarf2_locexpr_baton *dlbaton; | |
401 | const gdb_byte *start; | |
402 | size_t length; | |
403 | struct value *result; | |
404 | ||
405 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
406 | Thus, it's supposed to provide the find_frame_base_location method as | |
407 | well. */ | |
408 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
409 | ||
410 | gdbarch = get_frame_arch (frame); | |
411 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 412 | dlbaton = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (framefunc); |
63e43d3a PMR |
413 | |
414 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
415 | (framefunc, get_frame_pc (frame), &start, &length); | |
416 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
417 | dlbaton->per_cu); | |
418 | ||
419 | /* The DW_AT_frame_base attribute contains a location description which | |
420 | computes the base address itself. However, the call to | |
421 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
422 | that address. The frame base address is thus this variable's | |
423 | address. */ | |
424 | return value_address (result); | |
425 | } | |
426 | ||
f1e6e072 TT |
427 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
428 | function uses DWARF expression for its DW_AT_frame_base. */ | |
429 | ||
430 | const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs = | |
431 | { | |
63e43d3a | 432 | locexpr_find_frame_base_location, |
7d1c9c9b | 433 | locexpr_get_frame_base |
f1e6e072 TT |
434 | }; |
435 | ||
436 | /* Implement find_frame_base_location method for LOC_BLOCK functions using | |
437 | DWARF location list for its DW_AT_frame_base. */ | |
438 | ||
439 | static void | |
440 | loclist_find_frame_base_location (struct symbol *framefunc, CORE_ADDR pc, | |
441 | const gdb_byte **start, size_t *length) | |
442 | { | |
9a3c8263 SM |
443 | struct dwarf2_loclist_baton *symbaton |
444 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); | |
f1e6e072 TT |
445 | |
446 | *start = dwarf2_find_location_expression (symbaton, length, pc); | |
447 | } | |
448 | ||
7d1c9c9b JB |
449 | /* Implement the struct symbol_block_ops::get_frame_base method for |
450 | LOC_BLOCK functions using a DWARF location list as its DW_AT_frame_base. */ | |
451 | ||
452 | static CORE_ADDR | |
453 | loclist_get_frame_base (struct symbol *framefunc, struct frame_info *frame) | |
454 | { | |
455 | struct gdbarch *gdbarch; | |
456 | struct type *type; | |
457 | struct dwarf2_loclist_baton *dlbaton; | |
458 | const gdb_byte *start; | |
459 | size_t length; | |
460 | struct value *result; | |
461 | ||
462 | /* If this method is called, then FRAMEFUNC is supposed to be a DWARF block. | |
463 | Thus, it's supposed to provide the find_frame_base_location method as | |
464 | well. */ | |
465 | gdb_assert (SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location != NULL); | |
466 | ||
467 | gdbarch = get_frame_arch (frame); | |
468 | type = builtin_type (gdbarch)->builtin_data_ptr; | |
9a3c8263 | 469 | dlbaton = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (framefunc); |
7d1c9c9b JB |
470 | |
471 | SYMBOL_BLOCK_OPS (framefunc)->find_frame_base_location | |
472 | (framefunc, get_frame_pc (frame), &start, &length); | |
473 | result = dwarf2_evaluate_loc_desc (type, frame, start, length, | |
474 | dlbaton->per_cu); | |
475 | ||
476 | /* The DW_AT_frame_base attribute contains a location description which | |
477 | computes the base address itself. However, the call to | |
478 | dwarf2_evaluate_loc_desc returns a value representing a variable at | |
479 | that address. The frame base address is thus this variable's | |
480 | address. */ | |
481 | return value_address (result); | |
482 | } | |
483 | ||
f1e6e072 TT |
484 | /* Vector for inferior functions as represented by LOC_BLOCK, if the inferior |
485 | function uses DWARF location list for its DW_AT_frame_base. */ | |
486 | ||
487 | const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs = | |
488 | { | |
63e43d3a | 489 | loclist_find_frame_base_location, |
7d1c9c9b | 490 | loclist_get_frame_base |
f1e6e072 TT |
491 | }; |
492 | ||
af945b75 TT |
493 | /* See dwarf2loc.h. */ |
494 | ||
495 | void | |
496 | func_get_frame_base_dwarf_block (struct symbol *framefunc, CORE_ADDR pc, | |
497 | const gdb_byte **start, size_t *length) | |
0936ad1d | 498 | { |
f1e6e072 | 499 | if (SYMBOL_BLOCK_OPS (framefunc) != NULL) |
0d53c4c4 | 500 | { |
f1e6e072 | 501 | const struct symbol_block_ops *ops_block = SYMBOL_BLOCK_OPS (framefunc); |
22c6caba | 502 | |
f1e6e072 | 503 | ops_block->find_frame_base_location (framefunc, pc, start, length); |
0d53c4c4 DJ |
504 | } |
505 | else | |
f1e6e072 | 506 | *length = 0; |
0d53c4c4 | 507 | |
1d6edc3c | 508 | if (*length == 0) |
8a3fe4f8 | 509 | error (_("Could not find the frame base for \"%s\"."), |
0d53c4c4 | 510 | SYMBOL_NATURAL_NAME (framefunc)); |
4c2df51b DJ |
511 | } |
512 | ||
e7802207 TT |
513 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for |
514 | the frame in BATON. */ | |
515 | ||
516 | static CORE_ADDR | |
517 | dwarf_expr_frame_cfa (void *baton) | |
518 | { | |
519 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
9a619af0 | 520 | |
e7802207 TT |
521 | return dwarf2_frame_cfa (debaton->frame); |
522 | } | |
523 | ||
8cf6f0b1 TT |
524 | /* Helper function for dwarf2_evaluate_loc_desc. Computes the PC for |
525 | the frame in BATON. */ | |
526 | ||
527 | static CORE_ADDR | |
528 | dwarf_expr_frame_pc (void *baton) | |
529 | { | |
530 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
531 | ||
532 | return get_frame_address_in_block (debaton->frame); | |
533 | } | |
534 | ||
4c2df51b DJ |
535 | /* Using the objfile specified in BATON, find the address for the |
536 | current thread's thread-local storage with offset OFFSET. */ | |
537 | static CORE_ADDR | |
538 | dwarf_expr_tls_address (void *baton, CORE_ADDR offset) | |
539 | { | |
540 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
17ea53c3 | 541 | struct objfile *objfile = dwarf2_per_cu_objfile (debaton->per_cu); |
4c2df51b | 542 | |
17ea53c3 | 543 | return target_translate_tls_address (objfile, offset); |
4c2df51b DJ |
544 | } |
545 | ||
3e43a32a MS |
546 | /* Call DWARF subroutine from DW_AT_location of DIE at DIE_OFFSET in |
547 | current CU (as is PER_CU). State of the CTX is not affected by the | |
548 | call and return. */ | |
5c631832 JK |
549 | |
550 | static void | |
b64f50a1 | 551 | per_cu_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset, |
8cf6f0b1 TT |
552 | struct dwarf2_per_cu_data *per_cu, |
553 | CORE_ADDR (*get_frame_pc) (void *baton), | |
554 | void *baton) | |
5c631832 JK |
555 | { |
556 | struct dwarf2_locexpr_baton block; | |
557 | ||
8b9737bf | 558 | block = dwarf2_fetch_die_loc_cu_off (die_offset, per_cu, get_frame_pc, baton); |
5c631832 JK |
559 | |
560 | /* DW_OP_call_ref is currently not supported. */ | |
561 | gdb_assert (block.per_cu == per_cu); | |
562 | ||
563 | dwarf_expr_eval (ctx, block.data, block.size); | |
564 | } | |
565 | ||
566 | /* Helper interface of per_cu_dwarf_call for dwarf2_evaluate_loc_desc. */ | |
567 | ||
568 | static void | |
b64f50a1 | 569 | dwarf_expr_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset) |
5c631832 | 570 | { |
9a3c8263 | 571 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) ctx->baton; |
5c631832 | 572 | |
37b50a69 | 573 | per_cu_dwarf_call (ctx, die_offset, debaton->per_cu, |
9e8b7a03 | 574 | ctx->funcs->get_frame_pc, ctx->baton); |
5c631832 JK |
575 | } |
576 | ||
8a9b8146 TT |
577 | /* Callback function for dwarf2_evaluate_loc_desc. */ |
578 | ||
579 | static struct type * | |
b64f50a1 JK |
580 | dwarf_expr_get_base_type (struct dwarf_expr_context *ctx, |
581 | cu_offset die_offset) | |
8a9b8146 | 582 | { |
9a3c8263 | 583 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) ctx->baton; |
8a9b8146 TT |
584 | |
585 | return dwarf2_get_die_type (die_offset, debaton->per_cu); | |
586 | } | |
587 | ||
8e3b41a9 JK |
588 | /* See dwarf2loc.h. */ |
589 | ||
ccce17b0 | 590 | unsigned int entry_values_debug = 0; |
8e3b41a9 JK |
591 | |
592 | /* Helper to set entry_values_debug. */ | |
593 | ||
594 | static void | |
595 | show_entry_values_debug (struct ui_file *file, int from_tty, | |
596 | struct cmd_list_element *c, const char *value) | |
597 | { | |
598 | fprintf_filtered (file, | |
599 | _("Entry values and tail call frames debugging is %s.\n"), | |
600 | value); | |
601 | } | |
602 | ||
603 | /* Find DW_TAG_GNU_call_site's DW_AT_GNU_call_site_target address. | |
604 | CALLER_FRAME (for registers) can be NULL if it is not known. This function | |
605 | always returns valid address or it throws NO_ENTRY_VALUE_ERROR. */ | |
606 | ||
607 | static CORE_ADDR | |
608 | call_site_to_target_addr (struct gdbarch *call_site_gdbarch, | |
609 | struct call_site *call_site, | |
610 | struct frame_info *caller_frame) | |
611 | { | |
612 | switch (FIELD_LOC_KIND (call_site->target)) | |
613 | { | |
614 | case FIELD_LOC_KIND_DWARF_BLOCK: | |
615 | { | |
616 | struct dwarf2_locexpr_baton *dwarf_block; | |
617 | struct value *val; | |
618 | struct type *caller_core_addr_type; | |
619 | struct gdbarch *caller_arch; | |
620 | ||
621 | dwarf_block = FIELD_DWARF_BLOCK (call_site->target); | |
622 | if (dwarf_block == NULL) | |
623 | { | |
7cbd4a93 | 624 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
625 | |
626 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
627 | throw_error (NO_ENTRY_VALUE_ERROR, | |
628 | _("DW_AT_GNU_call_site_target is not specified " | |
629 | "at %s in %s"), | |
630 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 | 631 | (msym.minsym == NULL ? "???" |
efd66ac6 | 632 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
633 | |
634 | } | |
635 | if (caller_frame == NULL) | |
636 | { | |
7cbd4a93 | 637 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
638 | |
639 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); | |
640 | throw_error (NO_ENTRY_VALUE_ERROR, | |
641 | _("DW_AT_GNU_call_site_target DWARF block resolving " | |
642 | "requires known frame which is currently not " | |
643 | "available at %s in %s"), | |
644 | paddress (call_site_gdbarch, call_site->pc), | |
7cbd4a93 | 645 | (msym.minsym == NULL ? "???" |
efd66ac6 | 646 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
647 | |
648 | } | |
649 | caller_arch = get_frame_arch (caller_frame); | |
650 | caller_core_addr_type = builtin_type (caller_arch)->builtin_func_ptr; | |
651 | val = dwarf2_evaluate_loc_desc (caller_core_addr_type, caller_frame, | |
652 | dwarf_block->data, dwarf_block->size, | |
653 | dwarf_block->per_cu); | |
654 | /* DW_AT_GNU_call_site_target is a DWARF expression, not a DWARF | |
655 | location. */ | |
656 | if (VALUE_LVAL (val) == lval_memory) | |
657 | return value_address (val); | |
658 | else | |
659 | return value_as_address (val); | |
660 | } | |
661 | ||
662 | case FIELD_LOC_KIND_PHYSNAME: | |
663 | { | |
664 | const char *physname; | |
3b7344d5 | 665 | struct bound_minimal_symbol msym; |
8e3b41a9 JK |
666 | |
667 | physname = FIELD_STATIC_PHYSNAME (call_site->target); | |
9112db09 JK |
668 | |
669 | /* Handle both the mangled and demangled PHYSNAME. */ | |
670 | msym = lookup_minimal_symbol (physname, NULL, NULL); | |
3b7344d5 | 671 | if (msym.minsym == NULL) |
8e3b41a9 | 672 | { |
3b7344d5 | 673 | msym = lookup_minimal_symbol_by_pc (call_site->pc - 1); |
8e3b41a9 JK |
674 | throw_error (NO_ENTRY_VALUE_ERROR, |
675 | _("Cannot find function \"%s\" for a call site target " | |
676 | "at %s in %s"), | |
677 | physname, paddress (call_site_gdbarch, call_site->pc), | |
3b7344d5 TT |
678 | (msym.minsym == NULL ? "???" |
679 | : MSYMBOL_PRINT_NAME (msym.minsym))); | |
8e3b41a9 JK |
680 | |
681 | } | |
77e371c0 | 682 | return BMSYMBOL_VALUE_ADDRESS (msym); |
8e3b41a9 JK |
683 | } |
684 | ||
685 | case FIELD_LOC_KIND_PHYSADDR: | |
686 | return FIELD_STATIC_PHYSADDR (call_site->target); | |
687 | ||
688 | default: | |
689 | internal_error (__FILE__, __LINE__, _("invalid call site target kind")); | |
690 | } | |
691 | } | |
692 | ||
111c6489 JK |
693 | /* Convert function entry point exact address ADDR to the function which is |
694 | compliant with TAIL_CALL_LIST_COMPLETE condition. Throw | |
695 | NO_ENTRY_VALUE_ERROR otherwise. */ | |
696 | ||
697 | static struct symbol * | |
698 | func_addr_to_tail_call_list (struct gdbarch *gdbarch, CORE_ADDR addr) | |
699 | { | |
700 | struct symbol *sym = find_pc_function (addr); | |
701 | struct type *type; | |
702 | ||
703 | if (sym == NULL || BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) != addr) | |
704 | throw_error (NO_ENTRY_VALUE_ERROR, | |
705 | _("DW_TAG_GNU_call_site resolving failed to find function " | |
706 | "name for address %s"), | |
707 | paddress (gdbarch, addr)); | |
708 | ||
709 | type = SYMBOL_TYPE (sym); | |
710 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FUNC); | |
711 | gdb_assert (TYPE_SPECIFIC_FIELD (type) == TYPE_SPECIFIC_FUNC); | |
712 | ||
713 | return sym; | |
714 | } | |
715 | ||
2d6c5dc2 JK |
716 | /* Verify function with entry point exact address ADDR can never call itself |
717 | via its tail calls (incl. transitively). Throw NO_ENTRY_VALUE_ERROR if it | |
718 | can call itself via tail calls. | |
719 | ||
720 | If a funtion can tail call itself its entry value based parameters are | |
721 | unreliable. There is no verification whether the value of some/all | |
722 | parameters is unchanged through the self tail call, we expect if there is | |
723 | a self tail call all the parameters can be modified. */ | |
724 | ||
725 | static void | |
726 | func_verify_no_selftailcall (struct gdbarch *gdbarch, CORE_ADDR verify_addr) | |
727 | { | |
728 | struct obstack addr_obstack; | |
729 | struct cleanup *old_chain; | |
730 | CORE_ADDR addr; | |
731 | ||
732 | /* Track here CORE_ADDRs which were already visited. */ | |
733 | htab_t addr_hash; | |
734 | ||
735 | /* The verification is completely unordered. Track here function addresses | |
736 | which still need to be iterated. */ | |
737 | VEC (CORE_ADDR) *todo = NULL; | |
738 | ||
739 | obstack_init (&addr_obstack); | |
740 | old_chain = make_cleanup_obstack_free (&addr_obstack); | |
741 | addr_hash = htab_create_alloc_ex (64, core_addr_hash, core_addr_eq, NULL, | |
742 | &addr_obstack, hashtab_obstack_allocate, | |
743 | NULL); | |
744 | make_cleanup_htab_delete (addr_hash); | |
745 | ||
746 | make_cleanup (VEC_cleanup (CORE_ADDR), &todo); | |
747 | ||
748 | VEC_safe_push (CORE_ADDR, todo, verify_addr); | |
749 | while (!VEC_empty (CORE_ADDR, todo)) | |
750 | { | |
751 | struct symbol *func_sym; | |
752 | struct call_site *call_site; | |
753 | ||
754 | addr = VEC_pop (CORE_ADDR, todo); | |
755 | ||
756 | func_sym = func_addr_to_tail_call_list (gdbarch, addr); | |
757 | ||
758 | for (call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (func_sym)); | |
759 | call_site; call_site = call_site->tail_call_next) | |
760 | { | |
761 | CORE_ADDR target_addr; | |
762 | void **slot; | |
763 | ||
764 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
765 | frames. */ | |
766 | target_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
767 | ||
768 | if (target_addr == verify_addr) | |
769 | { | |
7cbd4a93 | 770 | struct bound_minimal_symbol msym; |
2d6c5dc2 JK |
771 | |
772 | msym = lookup_minimal_symbol_by_pc (verify_addr); | |
773 | throw_error (NO_ENTRY_VALUE_ERROR, | |
774 | _("DW_OP_GNU_entry_value resolving has found " | |
775 | "function \"%s\" at %s can call itself via tail " | |
776 | "calls"), | |
7cbd4a93 | 777 | (msym.minsym == NULL ? "???" |
efd66ac6 | 778 | : MSYMBOL_PRINT_NAME (msym.minsym)), |
2d6c5dc2 JK |
779 | paddress (gdbarch, verify_addr)); |
780 | } | |
781 | ||
782 | slot = htab_find_slot (addr_hash, &target_addr, INSERT); | |
783 | if (*slot == NULL) | |
784 | { | |
785 | *slot = obstack_copy (&addr_obstack, &target_addr, | |
786 | sizeof (target_addr)); | |
787 | VEC_safe_push (CORE_ADDR, todo, target_addr); | |
788 | } | |
789 | } | |
790 | } | |
791 | ||
792 | do_cleanups (old_chain); | |
793 | } | |
794 | ||
111c6489 JK |
795 | /* Print user readable form of CALL_SITE->PC to gdb_stdlog. Used only for |
796 | ENTRY_VALUES_DEBUG. */ | |
797 | ||
798 | static void | |
799 | tailcall_dump (struct gdbarch *gdbarch, const struct call_site *call_site) | |
800 | { | |
801 | CORE_ADDR addr = call_site->pc; | |
7cbd4a93 | 802 | struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (addr - 1); |
111c6489 JK |
803 | |
804 | fprintf_unfiltered (gdb_stdlog, " %s(%s)", paddress (gdbarch, addr), | |
7cbd4a93 | 805 | (msym.minsym == NULL ? "???" |
efd66ac6 | 806 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
111c6489 JK |
807 | |
808 | } | |
809 | ||
810 | /* vec.h needs single word type name, typedef it. */ | |
811 | typedef struct call_site *call_sitep; | |
812 | ||
813 | /* Define VEC (call_sitep) functions. */ | |
814 | DEF_VEC_P (call_sitep); | |
815 | ||
816 | /* Intersect RESULTP with CHAIN to keep RESULTP unambiguous, keep in RESULTP | |
817 | only top callers and bottom callees which are present in both. GDBARCH is | |
818 | used only for ENTRY_VALUES_DEBUG. RESULTP is NULL after return if there are | |
819 | no remaining possibilities to provide unambiguous non-trivial result. | |
820 | RESULTP should point to NULL on the first (initialization) call. Caller is | |
821 | responsible for xfree of any RESULTP data. */ | |
822 | ||
823 | static void | |
824 | chain_candidate (struct gdbarch *gdbarch, struct call_site_chain **resultp, | |
825 | VEC (call_sitep) *chain) | |
826 | { | |
827 | struct call_site_chain *result = *resultp; | |
828 | long length = VEC_length (call_sitep, chain); | |
829 | int callers, callees, idx; | |
830 | ||
831 | if (result == NULL) | |
832 | { | |
833 | /* Create the initial chain containing all the passed PCs. */ | |
834 | ||
224c3ddb SM |
835 | result = ((struct call_site_chain *) |
836 | xmalloc (sizeof (*result) | |
837 | + sizeof (*result->call_site) * (length - 1))); | |
111c6489 JK |
838 | result->length = length; |
839 | result->callers = result->callees = length; | |
19a1b230 AA |
840 | if (!VEC_empty (call_sitep, chain)) |
841 | memcpy (result->call_site, VEC_address (call_sitep, chain), | |
842 | sizeof (*result->call_site) * length); | |
111c6489 JK |
843 | *resultp = result; |
844 | ||
845 | if (entry_values_debug) | |
846 | { | |
847 | fprintf_unfiltered (gdb_stdlog, "tailcall: initial:"); | |
848 | for (idx = 0; idx < length; idx++) | |
849 | tailcall_dump (gdbarch, result->call_site[idx]); | |
850 | fputc_unfiltered ('\n', gdb_stdlog); | |
851 | } | |
852 | ||
853 | return; | |
854 | } | |
855 | ||
856 | if (entry_values_debug) | |
857 | { | |
858 | fprintf_unfiltered (gdb_stdlog, "tailcall: compare:"); | |
859 | for (idx = 0; idx < length; idx++) | |
860 | tailcall_dump (gdbarch, VEC_index (call_sitep, chain, idx)); | |
861 | fputc_unfiltered ('\n', gdb_stdlog); | |
862 | } | |
863 | ||
864 | /* Intersect callers. */ | |
865 | ||
325fac50 | 866 | callers = std::min ((long) result->callers, length); |
111c6489 JK |
867 | for (idx = 0; idx < callers; idx++) |
868 | if (result->call_site[idx] != VEC_index (call_sitep, chain, idx)) | |
869 | { | |
870 | result->callers = idx; | |
871 | break; | |
872 | } | |
873 | ||
874 | /* Intersect callees. */ | |
875 | ||
325fac50 | 876 | callees = std::min ((long) result->callees, length); |
111c6489 JK |
877 | for (idx = 0; idx < callees; idx++) |
878 | if (result->call_site[result->length - 1 - idx] | |
879 | != VEC_index (call_sitep, chain, length - 1 - idx)) | |
880 | { | |
881 | result->callees = idx; | |
882 | break; | |
883 | } | |
884 | ||
885 | if (entry_values_debug) | |
886 | { | |
887 | fprintf_unfiltered (gdb_stdlog, "tailcall: reduced:"); | |
888 | for (idx = 0; idx < result->callers; idx++) | |
889 | tailcall_dump (gdbarch, result->call_site[idx]); | |
890 | fputs_unfiltered (" |", gdb_stdlog); | |
891 | for (idx = 0; idx < result->callees; idx++) | |
892 | tailcall_dump (gdbarch, result->call_site[result->length | |
893 | - result->callees + idx]); | |
894 | fputc_unfiltered ('\n', gdb_stdlog); | |
895 | } | |
896 | ||
897 | if (result->callers == 0 && result->callees == 0) | |
898 | { | |
899 | /* There are no common callers or callees. It could be also a direct | |
900 | call (which has length 0) with ambiguous possibility of an indirect | |
901 | call - CALLERS == CALLEES == 0 is valid during the first allocation | |
902 | but any subsequence processing of such entry means ambiguity. */ | |
903 | xfree (result); | |
904 | *resultp = NULL; | |
905 | return; | |
906 | } | |
907 | ||
908 | /* See call_site_find_chain_1 why there is no way to reach the bottom callee | |
909 | PC again. In such case there must be two different code paths to reach | |
e0619de6 JK |
910 | it. CALLERS + CALLEES equal to LENGTH in the case of self tail-call. */ |
911 | gdb_assert (result->callers + result->callees <= result->length); | |
111c6489 JK |
912 | } |
913 | ||
914 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
915 | assumed frames between them use GDBARCH. Use depth first search so we can | |
916 | keep single CHAIN of call_site's back to CALLER_PC. Function recursion | |
917 | would have needless GDB stack overhead. Caller is responsible for xfree of | |
918 | the returned result. Any unreliability results in thrown | |
919 | NO_ENTRY_VALUE_ERROR. */ | |
920 | ||
921 | static struct call_site_chain * | |
922 | call_site_find_chain_1 (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
923 | CORE_ADDR callee_pc) | |
924 | { | |
c4be5165 | 925 | CORE_ADDR save_callee_pc = callee_pc; |
111c6489 JK |
926 | struct obstack addr_obstack; |
927 | struct cleanup *back_to_retval, *back_to_workdata; | |
928 | struct call_site_chain *retval = NULL; | |
929 | struct call_site *call_site; | |
930 | ||
931 | /* Mark CALL_SITEs so we do not visit the same ones twice. */ | |
932 | htab_t addr_hash; | |
933 | ||
934 | /* CHAIN contains only the intermediate CALL_SITEs. Neither CALLER_PC's | |
935 | call_site nor any possible call_site at CALLEE_PC's function is there. | |
936 | Any CALL_SITE in CHAIN will be iterated to its siblings - via | |
937 | TAIL_CALL_NEXT. This is inappropriate for CALLER_PC's call_site. */ | |
938 | VEC (call_sitep) *chain = NULL; | |
939 | ||
940 | /* We are not interested in the specific PC inside the callee function. */ | |
941 | callee_pc = get_pc_function_start (callee_pc); | |
942 | if (callee_pc == 0) | |
943 | throw_error (NO_ENTRY_VALUE_ERROR, _("Unable to find function for PC %s"), | |
c4be5165 | 944 | paddress (gdbarch, save_callee_pc)); |
111c6489 JK |
945 | |
946 | back_to_retval = make_cleanup (free_current_contents, &retval); | |
947 | ||
948 | obstack_init (&addr_obstack); | |
949 | back_to_workdata = make_cleanup_obstack_free (&addr_obstack); | |
950 | addr_hash = htab_create_alloc_ex (64, core_addr_hash, core_addr_eq, NULL, | |
951 | &addr_obstack, hashtab_obstack_allocate, | |
952 | NULL); | |
953 | make_cleanup_htab_delete (addr_hash); | |
954 | ||
955 | make_cleanup (VEC_cleanup (call_sitep), &chain); | |
956 | ||
957 | /* Do not push CALL_SITE to CHAIN. Push there only the first tail call site | |
958 | at the target's function. All the possible tail call sites in the | |
959 | target's function will get iterated as already pushed into CHAIN via their | |
960 | TAIL_CALL_NEXT. */ | |
961 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
962 | ||
963 | while (call_site) | |
964 | { | |
965 | CORE_ADDR target_func_addr; | |
966 | struct call_site *target_call_site; | |
967 | ||
968 | /* CALLER_FRAME with registers is not available for tail-call jumped | |
969 | frames. */ | |
970 | target_func_addr = call_site_to_target_addr (gdbarch, call_site, NULL); | |
971 | ||
972 | if (target_func_addr == callee_pc) | |
973 | { | |
974 | chain_candidate (gdbarch, &retval, chain); | |
975 | if (retval == NULL) | |
976 | break; | |
977 | ||
978 | /* There is no way to reach CALLEE_PC again as we would prevent | |
979 | entering it twice as being already marked in ADDR_HASH. */ | |
980 | target_call_site = NULL; | |
981 | } | |
982 | else | |
983 | { | |
984 | struct symbol *target_func; | |
985 | ||
986 | target_func = func_addr_to_tail_call_list (gdbarch, target_func_addr); | |
987 | target_call_site = TYPE_TAIL_CALL_LIST (SYMBOL_TYPE (target_func)); | |
988 | } | |
989 | ||
990 | do | |
991 | { | |
992 | /* Attempt to visit TARGET_CALL_SITE. */ | |
993 | ||
994 | if (target_call_site) | |
995 | { | |
996 | void **slot; | |
997 | ||
998 | slot = htab_find_slot (addr_hash, &target_call_site->pc, INSERT); | |
999 | if (*slot == NULL) | |
1000 | { | |
1001 | /* Successfully entered TARGET_CALL_SITE. */ | |
1002 | ||
1003 | *slot = &target_call_site->pc; | |
1004 | VEC_safe_push (call_sitep, chain, target_call_site); | |
1005 | break; | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | /* Backtrack (without revisiting the originating call_site). Try the | |
1010 | callers's sibling; if there isn't any try the callers's callers's | |
1011 | sibling etc. */ | |
1012 | ||
1013 | target_call_site = NULL; | |
1014 | while (!VEC_empty (call_sitep, chain)) | |
1015 | { | |
1016 | call_site = VEC_pop (call_sitep, chain); | |
1017 | ||
1018 | gdb_assert (htab_find_slot (addr_hash, &call_site->pc, | |
1019 | NO_INSERT) != NULL); | |
1020 | htab_remove_elt (addr_hash, &call_site->pc); | |
1021 | ||
1022 | target_call_site = call_site->tail_call_next; | |
1023 | if (target_call_site) | |
1024 | break; | |
1025 | } | |
1026 | } | |
1027 | while (target_call_site); | |
1028 | ||
1029 | if (VEC_empty (call_sitep, chain)) | |
1030 | call_site = NULL; | |
1031 | else | |
1032 | call_site = VEC_last (call_sitep, chain); | |
1033 | } | |
1034 | ||
1035 | if (retval == NULL) | |
1036 | { | |
7cbd4a93 | 1037 | struct bound_minimal_symbol msym_caller, msym_callee; |
111c6489 JK |
1038 | |
1039 | msym_caller = lookup_minimal_symbol_by_pc (caller_pc); | |
1040 | msym_callee = lookup_minimal_symbol_by_pc (callee_pc); | |
1041 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1042 | _("There are no unambiguously determinable intermediate " | |
1043 | "callers or callees between caller function \"%s\" at %s " | |
1044 | "and callee function \"%s\" at %s"), | |
7cbd4a93 | 1045 | (msym_caller.minsym == NULL |
efd66ac6 | 1046 | ? "???" : MSYMBOL_PRINT_NAME (msym_caller.minsym)), |
111c6489 | 1047 | paddress (gdbarch, caller_pc), |
7cbd4a93 | 1048 | (msym_callee.minsym == NULL |
efd66ac6 | 1049 | ? "???" : MSYMBOL_PRINT_NAME (msym_callee.minsym)), |
111c6489 JK |
1050 | paddress (gdbarch, callee_pc)); |
1051 | } | |
1052 | ||
1053 | do_cleanups (back_to_workdata); | |
1054 | discard_cleanups (back_to_retval); | |
1055 | return retval; | |
1056 | } | |
1057 | ||
1058 | /* Create and return call_site_chain for CALLER_PC and CALLEE_PC. All the | |
1059 | assumed frames between them use GDBARCH. If valid call_site_chain cannot be | |
1060 | constructed return NULL. Caller is responsible for xfree of the returned | |
1061 | result. */ | |
1062 | ||
1063 | struct call_site_chain * | |
1064 | call_site_find_chain (struct gdbarch *gdbarch, CORE_ADDR caller_pc, | |
1065 | CORE_ADDR callee_pc) | |
1066 | { | |
111c6489 JK |
1067 | struct call_site_chain *retval = NULL; |
1068 | ||
492d29ea | 1069 | TRY |
111c6489 JK |
1070 | { |
1071 | retval = call_site_find_chain_1 (gdbarch, caller_pc, callee_pc); | |
1072 | } | |
492d29ea | 1073 | CATCH (e, RETURN_MASK_ERROR) |
111c6489 JK |
1074 | { |
1075 | if (e.error == NO_ENTRY_VALUE_ERROR) | |
1076 | { | |
1077 | if (entry_values_debug) | |
1078 | exception_print (gdb_stdout, e); | |
1079 | ||
1080 | return NULL; | |
1081 | } | |
1082 | else | |
1083 | throw_exception (e); | |
1084 | } | |
492d29ea PA |
1085 | END_CATCH |
1086 | ||
111c6489 JK |
1087 | return retval; |
1088 | } | |
1089 | ||
24c5c679 JK |
1090 | /* Return 1 if KIND and KIND_U match PARAMETER. Return 0 otherwise. */ |
1091 | ||
1092 | static int | |
1093 | call_site_parameter_matches (struct call_site_parameter *parameter, | |
1094 | enum call_site_parameter_kind kind, | |
1095 | union call_site_parameter_u kind_u) | |
1096 | { | |
1097 | if (kind == parameter->kind) | |
1098 | switch (kind) | |
1099 | { | |
1100 | case CALL_SITE_PARAMETER_DWARF_REG: | |
1101 | return kind_u.dwarf_reg == parameter->u.dwarf_reg; | |
1102 | case CALL_SITE_PARAMETER_FB_OFFSET: | |
1103 | return kind_u.fb_offset == parameter->u.fb_offset; | |
1788b2d3 JK |
1104 | case CALL_SITE_PARAMETER_PARAM_OFFSET: |
1105 | return kind_u.param_offset.cu_off == parameter->u.param_offset.cu_off; | |
24c5c679 JK |
1106 | } |
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | /* Fetch call_site_parameter from caller matching KIND and KIND_U. | |
1111 | FRAME is for callee. | |
8e3b41a9 JK |
1112 | |
1113 | Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR | |
1114 | otherwise. */ | |
1115 | ||
1116 | static struct call_site_parameter * | |
24c5c679 JK |
1117 | dwarf_expr_reg_to_entry_parameter (struct frame_info *frame, |
1118 | enum call_site_parameter_kind kind, | |
1119 | union call_site_parameter_u kind_u, | |
8e3b41a9 JK |
1120 | struct dwarf2_per_cu_data **per_cu_return) |
1121 | { | |
9e3a7d65 JK |
1122 | CORE_ADDR func_addr, caller_pc; |
1123 | struct gdbarch *gdbarch; | |
1124 | struct frame_info *caller_frame; | |
8e3b41a9 JK |
1125 | struct call_site *call_site; |
1126 | int iparams; | |
509f0fd9 JK |
1127 | /* Initialize it just to avoid a GCC false warning. */ |
1128 | struct call_site_parameter *parameter = NULL; | |
8e3b41a9 JK |
1129 | CORE_ADDR target_addr; |
1130 | ||
9e3a7d65 JK |
1131 | while (get_frame_type (frame) == INLINE_FRAME) |
1132 | { | |
1133 | frame = get_prev_frame (frame); | |
1134 | gdb_assert (frame != NULL); | |
1135 | } | |
1136 | ||
1137 | func_addr = get_frame_func (frame); | |
1138 | gdbarch = get_frame_arch (frame); | |
1139 | caller_frame = get_prev_frame (frame); | |
8e3b41a9 JK |
1140 | if (gdbarch != frame_unwind_arch (frame)) |
1141 | { | |
7cbd4a93 TT |
1142 | struct bound_minimal_symbol msym |
1143 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1144 | struct gdbarch *caller_gdbarch = frame_unwind_arch (frame); |
1145 | ||
1146 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1147 | _("DW_OP_GNU_entry_value resolving callee gdbarch %s " | |
1148 | "(of %s (%s)) does not match caller gdbarch %s"), | |
1149 | gdbarch_bfd_arch_info (gdbarch)->printable_name, | |
1150 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1151 | (msym.minsym == NULL ? "???" |
efd66ac6 | 1152 | : MSYMBOL_PRINT_NAME (msym.minsym)), |
8e3b41a9 JK |
1153 | gdbarch_bfd_arch_info (caller_gdbarch)->printable_name); |
1154 | } | |
1155 | ||
1156 | if (caller_frame == NULL) | |
1157 | { | |
7cbd4a93 TT |
1158 | struct bound_minimal_symbol msym |
1159 | = lookup_minimal_symbol_by_pc (func_addr); | |
8e3b41a9 JK |
1160 | |
1161 | throw_error (NO_ENTRY_VALUE_ERROR, _("DW_OP_GNU_entry_value resolving " | |
1162 | "requires caller of %s (%s)"), | |
1163 | paddress (gdbarch, func_addr), | |
7cbd4a93 | 1164 | (msym.minsym == NULL ? "???" |
efd66ac6 | 1165 | : MSYMBOL_PRINT_NAME (msym.minsym))); |
8e3b41a9 JK |
1166 | } |
1167 | caller_pc = get_frame_pc (caller_frame); | |
1168 | call_site = call_site_for_pc (gdbarch, caller_pc); | |
1169 | ||
1170 | target_addr = call_site_to_target_addr (gdbarch, call_site, caller_frame); | |
1171 | if (target_addr != func_addr) | |
1172 | { | |
1173 | struct minimal_symbol *target_msym, *func_msym; | |
1174 | ||
7cbd4a93 TT |
1175 | target_msym = lookup_minimal_symbol_by_pc (target_addr).minsym; |
1176 | func_msym = lookup_minimal_symbol_by_pc (func_addr).minsym; | |
8e3b41a9 JK |
1177 | throw_error (NO_ENTRY_VALUE_ERROR, |
1178 | _("DW_OP_GNU_entry_value resolving expects callee %s at %s " | |
1179 | "but the called frame is for %s at %s"), | |
1180 | (target_msym == NULL ? "???" | |
efd66ac6 | 1181 | : MSYMBOL_PRINT_NAME (target_msym)), |
8e3b41a9 | 1182 | paddress (gdbarch, target_addr), |
efd66ac6 | 1183 | func_msym == NULL ? "???" : MSYMBOL_PRINT_NAME (func_msym), |
8e3b41a9 JK |
1184 | paddress (gdbarch, func_addr)); |
1185 | } | |
1186 | ||
2d6c5dc2 JK |
1187 | /* No entry value based parameters would be reliable if this function can |
1188 | call itself via tail calls. */ | |
1189 | func_verify_no_selftailcall (gdbarch, func_addr); | |
1190 | ||
8e3b41a9 JK |
1191 | for (iparams = 0; iparams < call_site->parameter_count; iparams++) |
1192 | { | |
1193 | parameter = &call_site->parameter[iparams]; | |
24c5c679 | 1194 | if (call_site_parameter_matches (parameter, kind, kind_u)) |
8e3b41a9 JK |
1195 | break; |
1196 | } | |
1197 | if (iparams == call_site->parameter_count) | |
1198 | { | |
7cbd4a93 TT |
1199 | struct minimal_symbol *msym |
1200 | = lookup_minimal_symbol_by_pc (caller_pc).minsym; | |
8e3b41a9 JK |
1201 | |
1202 | /* DW_TAG_GNU_call_site_parameter will be missing just if GCC could not | |
1203 | determine its value. */ | |
1204 | throw_error (NO_ENTRY_VALUE_ERROR, _("Cannot find matching parameter " | |
1205 | "at DW_TAG_GNU_call_site %s at %s"), | |
1206 | paddress (gdbarch, caller_pc), | |
efd66ac6 | 1207 | msym == NULL ? "???" : MSYMBOL_PRINT_NAME (msym)); |
8e3b41a9 JK |
1208 | } |
1209 | ||
1210 | *per_cu_return = call_site->per_cu; | |
1211 | return parameter; | |
1212 | } | |
1213 | ||
a471c594 JK |
1214 | /* Return value for PARAMETER matching DEREF_SIZE. If DEREF_SIZE is -1, return |
1215 | the normal DW_AT_GNU_call_site_value block. Otherwise return the | |
1216 | DW_AT_GNU_call_site_data_value (dereferenced) block. | |
e18b2753 JK |
1217 | |
1218 | TYPE and CALLER_FRAME specify how to evaluate the DWARF block into returned | |
1219 | struct value. | |
1220 | ||
1221 | Function always returns non-NULL, non-optimized out value. It throws | |
1222 | NO_ENTRY_VALUE_ERROR if it cannot resolve the value for any reason. */ | |
1223 | ||
1224 | static struct value * | |
1225 | dwarf_entry_parameter_to_value (struct call_site_parameter *parameter, | |
a471c594 | 1226 | CORE_ADDR deref_size, struct type *type, |
e18b2753 JK |
1227 | struct frame_info *caller_frame, |
1228 | struct dwarf2_per_cu_data *per_cu) | |
1229 | { | |
a471c594 | 1230 | const gdb_byte *data_src; |
e18b2753 | 1231 | gdb_byte *data; |
a471c594 JK |
1232 | size_t size; |
1233 | ||
1234 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; | |
1235 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1236 | ||
1237 | /* DEREF_SIZE size is not verified here. */ | |
1238 | if (data_src == NULL) | |
1239 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1240 | _("Cannot resolve DW_AT_GNU_call_site_data_value")); | |
e18b2753 JK |
1241 | |
1242 | /* DW_AT_GNU_call_site_value is a DWARF expression, not a DWARF | |
1243 | location. Postprocessing of DWARF_VALUE_MEMORY would lose the type from | |
1244 | DWARF block. */ | |
224c3ddb | 1245 | data = (gdb_byte *) alloca (size + 1); |
a471c594 JK |
1246 | memcpy (data, data_src, size); |
1247 | data[size] = DW_OP_stack_value; | |
e18b2753 | 1248 | |
a471c594 | 1249 | return dwarf2_evaluate_loc_desc (type, caller_frame, data, size + 1, per_cu); |
e18b2753 JK |
1250 | } |
1251 | ||
24c5c679 JK |
1252 | /* Execute DWARF block of call_site_parameter which matches KIND and KIND_U. |
1253 | Choose DEREF_SIZE value of that parameter. Search caller of the CTX's | |
1254 | frame. CTX must be of dwarf_expr_ctx_funcs kind. | |
8e3b41a9 JK |
1255 | |
1256 | The CTX caller can be from a different CU - per_cu_dwarf_call implementation | |
1257 | can be more simple as it does not support cross-CU DWARF executions. */ | |
1258 | ||
1259 | static void | |
1260 | dwarf_expr_push_dwarf_reg_entry_value (struct dwarf_expr_context *ctx, | |
24c5c679 JK |
1261 | enum call_site_parameter_kind kind, |
1262 | union call_site_parameter_u kind_u, | |
a471c594 | 1263 | int deref_size) |
8e3b41a9 JK |
1264 | { |
1265 | struct dwarf_expr_baton *debaton; | |
1266 | struct frame_info *frame, *caller_frame; | |
1267 | struct dwarf2_per_cu_data *caller_per_cu; | |
1268 | struct dwarf_expr_baton baton_local; | |
1269 | struct dwarf_expr_context saved_ctx; | |
1270 | struct call_site_parameter *parameter; | |
1271 | const gdb_byte *data_src; | |
1272 | size_t size; | |
1273 | ||
1274 | gdb_assert (ctx->funcs == &dwarf_expr_ctx_funcs); | |
9a3c8263 | 1275 | debaton = (struct dwarf_expr_baton *) ctx->baton; |
8e3b41a9 JK |
1276 | frame = debaton->frame; |
1277 | caller_frame = get_prev_frame (frame); | |
1278 | ||
24c5c679 | 1279 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
8e3b41a9 | 1280 | &caller_per_cu); |
a471c594 JK |
1281 | data_src = deref_size == -1 ? parameter->value : parameter->data_value; |
1282 | size = deref_size == -1 ? parameter->value_size : parameter->data_value_size; | |
1283 | ||
1284 | /* DEREF_SIZE size is not verified here. */ | |
1285 | if (data_src == NULL) | |
1286 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1287 | _("Cannot resolve DW_AT_GNU_call_site_data_value")); | |
8e3b41a9 JK |
1288 | |
1289 | baton_local.frame = caller_frame; | |
1290 | baton_local.per_cu = caller_per_cu; | |
08412b07 | 1291 | baton_local.obj_address = 0; |
8e3b41a9 JK |
1292 | |
1293 | saved_ctx.gdbarch = ctx->gdbarch; | |
1294 | saved_ctx.addr_size = ctx->addr_size; | |
1295 | saved_ctx.offset = ctx->offset; | |
1296 | saved_ctx.baton = ctx->baton; | |
1297 | ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (baton_local.per_cu)); | |
1298 | ctx->addr_size = dwarf2_per_cu_addr_size (baton_local.per_cu); | |
1299 | ctx->offset = dwarf2_per_cu_text_offset (baton_local.per_cu); | |
1300 | ctx->baton = &baton_local; | |
1301 | ||
1302 | dwarf_expr_eval (ctx, data_src, size); | |
1303 | ||
1304 | ctx->gdbarch = saved_ctx.gdbarch; | |
1305 | ctx->addr_size = saved_ctx.addr_size; | |
1306 | ctx->offset = saved_ctx.offset; | |
1307 | ctx->baton = saved_ctx.baton; | |
1308 | } | |
1309 | ||
3019eac3 DE |
1310 | /* Callback function for dwarf2_evaluate_loc_desc. |
1311 | Fetch the address indexed by DW_OP_GNU_addr_index. */ | |
1312 | ||
1313 | static CORE_ADDR | |
1314 | dwarf_expr_get_addr_index (void *baton, unsigned int index) | |
1315 | { | |
1316 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; | |
1317 | ||
1318 | return dwarf2_read_addr_index (debaton->per_cu, index); | |
1319 | } | |
1320 | ||
08412b07 JB |
1321 | /* Callback function for get_object_address. Return the address of the VLA |
1322 | object. */ | |
1323 | ||
1324 | static CORE_ADDR | |
1325 | dwarf_expr_get_obj_addr (void *baton) | |
1326 | { | |
9a3c8263 | 1327 | struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton; |
08412b07 JB |
1328 | |
1329 | gdb_assert (debaton != NULL); | |
1330 | ||
1331 | if (debaton->obj_address == 0) | |
1332 | error (_("Location address is not set.")); | |
1333 | ||
1334 | return debaton->obj_address; | |
1335 | } | |
1336 | ||
a471c594 JK |
1337 | /* VALUE must be of type lval_computed with entry_data_value_funcs. Perform |
1338 | the indirect method on it, that is use its stored target value, the sole | |
1339 | purpose of entry_data_value_funcs.. */ | |
1340 | ||
1341 | static struct value * | |
1342 | entry_data_value_coerce_ref (const struct value *value) | |
1343 | { | |
1344 | struct type *checked_type = check_typedef (value_type (value)); | |
1345 | struct value *target_val; | |
1346 | ||
1347 | if (TYPE_CODE (checked_type) != TYPE_CODE_REF) | |
1348 | return NULL; | |
1349 | ||
9a3c8263 | 1350 | target_val = (struct value *) value_computed_closure (value); |
a471c594 JK |
1351 | value_incref (target_val); |
1352 | return target_val; | |
1353 | } | |
1354 | ||
1355 | /* Implement copy_closure. */ | |
1356 | ||
1357 | static void * | |
1358 | entry_data_value_copy_closure (const struct value *v) | |
1359 | { | |
9a3c8263 | 1360 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1361 | |
1362 | value_incref (target_val); | |
1363 | return target_val; | |
1364 | } | |
1365 | ||
1366 | /* Implement free_closure. */ | |
1367 | ||
1368 | static void | |
1369 | entry_data_value_free_closure (struct value *v) | |
1370 | { | |
9a3c8263 | 1371 | struct value *target_val = (struct value *) value_computed_closure (v); |
a471c594 JK |
1372 | |
1373 | value_free (target_val); | |
1374 | } | |
1375 | ||
1376 | /* Vector for methods for an entry value reference where the referenced value | |
1377 | is stored in the caller. On the first dereference use | |
1378 | DW_AT_GNU_call_site_data_value in the caller. */ | |
1379 | ||
1380 | static const struct lval_funcs entry_data_value_funcs = | |
1381 | { | |
1382 | NULL, /* read */ | |
1383 | NULL, /* write */ | |
a471c594 JK |
1384 | NULL, /* indirect */ |
1385 | entry_data_value_coerce_ref, | |
1386 | NULL, /* check_synthetic_pointer */ | |
1387 | entry_data_value_copy_closure, | |
1388 | entry_data_value_free_closure | |
1389 | }; | |
1390 | ||
24c5c679 JK |
1391 | /* Read parameter of TYPE at (callee) FRAME's function entry. KIND and KIND_U |
1392 | are used to match DW_AT_location at the caller's | |
1393 | DW_TAG_GNU_call_site_parameter. | |
e18b2753 JK |
1394 | |
1395 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1396 | cannot resolve the parameter for any reason. */ | |
1397 | ||
1398 | static struct value * | |
1399 | value_of_dwarf_reg_entry (struct type *type, struct frame_info *frame, | |
24c5c679 JK |
1400 | enum call_site_parameter_kind kind, |
1401 | union call_site_parameter_u kind_u) | |
e18b2753 | 1402 | { |
a471c594 JK |
1403 | struct type *checked_type = check_typedef (type); |
1404 | struct type *target_type = TYPE_TARGET_TYPE (checked_type); | |
e18b2753 | 1405 | struct frame_info *caller_frame = get_prev_frame (frame); |
a471c594 | 1406 | struct value *outer_val, *target_val, *val; |
e18b2753 JK |
1407 | struct call_site_parameter *parameter; |
1408 | struct dwarf2_per_cu_data *caller_per_cu; | |
1409 | ||
24c5c679 | 1410 | parameter = dwarf_expr_reg_to_entry_parameter (frame, kind, kind_u, |
e18b2753 JK |
1411 | &caller_per_cu); |
1412 | ||
a471c594 JK |
1413 | outer_val = dwarf_entry_parameter_to_value (parameter, -1 /* deref_size */, |
1414 | type, caller_frame, | |
1415 | caller_per_cu); | |
1416 | ||
1417 | /* Check if DW_AT_GNU_call_site_data_value cannot be used. If it should be | |
1418 | used and it is not available do not fall back to OUTER_VAL - dereferencing | |
1419 | TYPE_CODE_REF with non-entry data value would give current value - not the | |
1420 | entry value. */ | |
1421 | ||
1422 | if (TYPE_CODE (checked_type) != TYPE_CODE_REF | |
1423 | || TYPE_TARGET_TYPE (checked_type) == NULL) | |
1424 | return outer_val; | |
1425 | ||
1426 | target_val = dwarf_entry_parameter_to_value (parameter, | |
1427 | TYPE_LENGTH (target_type), | |
1428 | target_type, caller_frame, | |
1429 | caller_per_cu); | |
1430 | ||
a471c594 JK |
1431 | release_value (target_val); |
1432 | val = allocate_computed_value (type, &entry_data_value_funcs, | |
1433 | target_val /* closure */); | |
1434 | ||
1435 | /* Copy the referencing pointer to the new computed value. */ | |
1436 | memcpy (value_contents_raw (val), value_contents_raw (outer_val), | |
1437 | TYPE_LENGTH (checked_type)); | |
1438 | set_value_lazy (val, 0); | |
1439 | ||
1440 | return val; | |
e18b2753 JK |
1441 | } |
1442 | ||
1443 | /* Read parameter of TYPE at (callee) FRAME's function entry. DATA and | |
1444 | SIZE are DWARF block used to match DW_AT_location at the caller's | |
1445 | DW_TAG_GNU_call_site_parameter. | |
1446 | ||
1447 | Function always returns non-NULL value. It throws NO_ENTRY_VALUE_ERROR if it | |
1448 | cannot resolve the parameter for any reason. */ | |
1449 | ||
1450 | static struct value * | |
1451 | value_of_dwarf_block_entry (struct type *type, struct frame_info *frame, | |
1452 | const gdb_byte *block, size_t block_len) | |
1453 | { | |
24c5c679 | 1454 | union call_site_parameter_u kind_u; |
e18b2753 | 1455 | |
24c5c679 JK |
1456 | kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (block, block + block_len); |
1457 | if (kind_u.dwarf_reg != -1) | |
1458 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_DWARF_REG, | |
1459 | kind_u); | |
e18b2753 | 1460 | |
24c5c679 JK |
1461 | if (dwarf_block_to_fb_offset (block, block + block_len, &kind_u.fb_offset)) |
1462 | return value_of_dwarf_reg_entry (type, frame, CALL_SITE_PARAMETER_FB_OFFSET, | |
1463 | kind_u); | |
e18b2753 JK |
1464 | |
1465 | /* This can normally happen - throw NO_ENTRY_VALUE_ERROR to get the message | |
1466 | suppressed during normal operation. The expression can be arbitrary if | |
1467 | there is no caller-callee entry value binding expected. */ | |
1468 | throw_error (NO_ENTRY_VALUE_ERROR, | |
1469 | _("DWARF-2 expression error: DW_OP_GNU_entry_value is supported " | |
1470 | "only for single DW_OP_reg* or for DW_OP_fbreg(*)")); | |
1471 | } | |
1472 | ||
052b9502 NF |
1473 | struct piece_closure |
1474 | { | |
88bfdde4 TT |
1475 | /* Reference count. */ |
1476 | int refc; | |
1477 | ||
8cf6f0b1 TT |
1478 | /* The CU from which this closure's expression came. */ |
1479 | struct dwarf2_per_cu_data *per_cu; | |
1480 | ||
052b9502 NF |
1481 | /* The number of pieces used to describe this variable. */ |
1482 | int n_pieces; | |
1483 | ||
6063c216 UW |
1484 | /* The target address size, used only for DWARF_VALUE_STACK. */ |
1485 | int addr_size; | |
cec03d70 | 1486 | |
052b9502 NF |
1487 | /* The pieces themselves. */ |
1488 | struct dwarf_expr_piece *pieces; | |
1489 | }; | |
1490 | ||
1491 | /* Allocate a closure for a value formed from separately-described | |
1492 | PIECES. */ | |
1493 | ||
1494 | static struct piece_closure * | |
8cf6f0b1 TT |
1495 | allocate_piece_closure (struct dwarf2_per_cu_data *per_cu, |
1496 | int n_pieces, struct dwarf_expr_piece *pieces, | |
6063c216 | 1497 | int addr_size) |
052b9502 | 1498 | { |
41bf6aca | 1499 | struct piece_closure *c = XCNEW (struct piece_closure); |
8a9b8146 | 1500 | int i; |
052b9502 | 1501 | |
88bfdde4 | 1502 | c->refc = 1; |
8cf6f0b1 | 1503 | c->per_cu = per_cu; |
052b9502 | 1504 | c->n_pieces = n_pieces; |
6063c216 | 1505 | c->addr_size = addr_size; |
fc270c35 | 1506 | c->pieces = XCNEWVEC (struct dwarf_expr_piece, n_pieces); |
052b9502 NF |
1507 | |
1508 | memcpy (c->pieces, pieces, n_pieces * sizeof (struct dwarf_expr_piece)); | |
8a9b8146 TT |
1509 | for (i = 0; i < n_pieces; ++i) |
1510 | if (c->pieces[i].location == DWARF_VALUE_STACK) | |
1511 | value_incref (c->pieces[i].v.value); | |
052b9502 NF |
1512 | |
1513 | return c; | |
1514 | } | |
1515 | ||
d3b1e874 TT |
1516 | /* The lowest-level function to extract bits from a byte buffer. |
1517 | SOURCE is the buffer. It is updated if we read to the end of a | |
1518 | byte. | |
1519 | SOURCE_OFFSET_BITS is the offset of the first bit to read. It is | |
1520 | updated to reflect the number of bits actually read. | |
1521 | NBITS is the number of bits we want to read. It is updated to | |
1522 | reflect the number of bits actually read. This function may read | |
1523 | fewer bits. | |
1524 | BITS_BIG_ENDIAN is taken directly from gdbarch. | |
1525 | This function returns the extracted bits. */ | |
1526 | ||
1527 | static unsigned int | |
1528 | extract_bits_primitive (const gdb_byte **source, | |
1529 | unsigned int *source_offset_bits, | |
1530 | int *nbits, int bits_big_endian) | |
1531 | { | |
1532 | unsigned int avail, mask, datum; | |
1533 | ||
1534 | gdb_assert (*source_offset_bits < 8); | |
1535 | ||
1536 | avail = 8 - *source_offset_bits; | |
1537 | if (avail > *nbits) | |
1538 | avail = *nbits; | |
1539 | ||
1540 | mask = (1 << avail) - 1; | |
1541 | datum = **source; | |
1542 | if (bits_big_endian) | |
1543 | datum >>= 8 - (*source_offset_bits + *nbits); | |
1544 | else | |
1545 | datum >>= *source_offset_bits; | |
1546 | datum &= mask; | |
1547 | ||
1548 | *nbits -= avail; | |
1549 | *source_offset_bits += avail; | |
1550 | if (*source_offset_bits >= 8) | |
1551 | { | |
1552 | *source_offset_bits -= 8; | |
1553 | ++*source; | |
1554 | } | |
1555 | ||
1556 | return datum; | |
1557 | } | |
1558 | ||
1559 | /* Extract some bits from a source buffer and move forward in the | |
1560 | buffer. | |
1561 | ||
1562 | SOURCE is the source buffer. It is updated as bytes are read. | |
1563 | SOURCE_OFFSET_BITS is the offset into SOURCE. It is updated as | |
1564 | bits are read. | |
1565 | NBITS is the number of bits to read. | |
1566 | BITS_BIG_ENDIAN is taken directly from gdbarch. | |
1567 | ||
1568 | This function returns the bits that were read. */ | |
1569 | ||
1570 | static unsigned int | |
1571 | extract_bits (const gdb_byte **source, unsigned int *source_offset_bits, | |
1572 | int nbits, int bits_big_endian) | |
1573 | { | |
1574 | unsigned int datum; | |
1575 | ||
1576 | gdb_assert (nbits > 0 && nbits <= 8); | |
1577 | ||
1578 | datum = extract_bits_primitive (source, source_offset_bits, &nbits, | |
1579 | bits_big_endian); | |
1580 | if (nbits > 0) | |
1581 | { | |
1582 | unsigned int more; | |
1583 | ||
1584 | more = extract_bits_primitive (source, source_offset_bits, &nbits, | |
1585 | bits_big_endian); | |
1586 | if (bits_big_endian) | |
1587 | datum <<= nbits; | |
1588 | else | |
1589 | more <<= nbits; | |
1590 | datum |= more; | |
1591 | } | |
1592 | ||
1593 | return datum; | |
1594 | } | |
1595 | ||
1596 | /* Write some bits into a buffer and move forward in the buffer. | |
1597 | ||
1598 | DATUM is the bits to write. The low-order bits of DATUM are used. | |
1599 | DEST is the destination buffer. It is updated as bytes are | |
1600 | written. | |
1601 | DEST_OFFSET_BITS is the bit offset in DEST at which writing is | |
1602 | done. | |
1603 | NBITS is the number of valid bits in DATUM. | |
1604 | BITS_BIG_ENDIAN is taken directly from gdbarch. */ | |
1605 | ||
1606 | static void | |
1607 | insert_bits (unsigned int datum, | |
1608 | gdb_byte *dest, unsigned int dest_offset_bits, | |
1609 | int nbits, int bits_big_endian) | |
1610 | { | |
1611 | unsigned int mask; | |
1612 | ||
8c814cdd | 1613 | gdb_assert (dest_offset_bits + nbits <= 8); |
d3b1e874 TT |
1614 | |
1615 | mask = (1 << nbits) - 1; | |
1616 | if (bits_big_endian) | |
1617 | { | |
1618 | datum <<= 8 - (dest_offset_bits + nbits); | |
1619 | mask <<= 8 - (dest_offset_bits + nbits); | |
1620 | } | |
1621 | else | |
1622 | { | |
1623 | datum <<= dest_offset_bits; | |
1624 | mask <<= dest_offset_bits; | |
1625 | } | |
1626 | ||
1627 | gdb_assert ((datum & ~mask) == 0); | |
1628 | ||
1629 | *dest = (*dest & ~mask) | datum; | |
1630 | } | |
1631 | ||
1632 | /* Copy bits from a source to a destination. | |
1633 | ||
1634 | DEST is where the bits should be written. | |
1635 | DEST_OFFSET_BITS is the bit offset into DEST. | |
1636 | SOURCE is the source of bits. | |
1637 | SOURCE_OFFSET_BITS is the bit offset into SOURCE. | |
1638 | BIT_COUNT is the number of bits to copy. | |
1639 | BITS_BIG_ENDIAN is taken directly from gdbarch. */ | |
1640 | ||
1641 | static void | |
1642 | copy_bitwise (gdb_byte *dest, unsigned int dest_offset_bits, | |
1643 | const gdb_byte *source, unsigned int source_offset_bits, | |
1644 | unsigned int bit_count, | |
1645 | int bits_big_endian) | |
1646 | { | |
1647 | unsigned int dest_avail; | |
1648 | int datum; | |
1649 | ||
1650 | /* Reduce everything to byte-size pieces. */ | |
1651 | dest += dest_offset_bits / 8; | |
1652 | dest_offset_bits %= 8; | |
1653 | source += source_offset_bits / 8; | |
1654 | source_offset_bits %= 8; | |
1655 | ||
1656 | dest_avail = 8 - dest_offset_bits % 8; | |
1657 | ||
1658 | /* See if we can fill the first destination byte. */ | |
1659 | if (dest_avail < bit_count) | |
1660 | { | |
1661 | datum = extract_bits (&source, &source_offset_bits, dest_avail, | |
1662 | bits_big_endian); | |
1663 | insert_bits (datum, dest, dest_offset_bits, dest_avail, bits_big_endian); | |
1664 | ++dest; | |
1665 | dest_offset_bits = 0; | |
1666 | bit_count -= dest_avail; | |
1667 | } | |
1668 | ||
1669 | /* Now, either DEST_OFFSET_BITS is byte-aligned, or we have fewer | |
1670 | than 8 bits remaining. */ | |
1671 | gdb_assert (dest_offset_bits % 8 == 0 || bit_count < 8); | |
1672 | for (; bit_count >= 8; bit_count -= 8) | |
1673 | { | |
1674 | datum = extract_bits (&source, &source_offset_bits, 8, bits_big_endian); | |
1675 | *dest++ = (gdb_byte) datum; | |
1676 | } | |
1677 | ||
1678 | /* Finally, we may have a few leftover bits. */ | |
1679 | gdb_assert (bit_count <= 8 - dest_offset_bits % 8); | |
1680 | if (bit_count > 0) | |
1681 | { | |
1682 | datum = extract_bits (&source, &source_offset_bits, bit_count, | |
1683 | bits_big_endian); | |
1684 | insert_bits (datum, dest, dest_offset_bits, bit_count, bits_big_endian); | |
1685 | } | |
1686 | } | |
1687 | ||
052b9502 NF |
1688 | static void |
1689 | read_pieced_value (struct value *v) | |
1690 | { | |
1691 | int i; | |
1692 | long offset = 0; | |
d3b1e874 | 1693 | ULONGEST bits_to_skip; |
052b9502 | 1694 | gdb_byte *contents; |
3e43a32a MS |
1695 | struct piece_closure *c |
1696 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 1697 | struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (v)); |
afd74c5f | 1698 | size_t type_len; |
d3b1e874 | 1699 | size_t buffer_size = 0; |
948f8e3d | 1700 | gdb_byte *buffer = NULL; |
d3b1e874 TT |
1701 | struct cleanup *cleanup; |
1702 | int bits_big_endian | |
1703 | = gdbarch_bits_big_endian (get_type_arch (value_type (v))); | |
afd74c5f TT |
1704 | |
1705 | if (value_type (v) != value_enclosing_type (v)) | |
1706 | internal_error (__FILE__, __LINE__, | |
1707 | _("Should not be able to create a lazy value with " | |
1708 | "an enclosing type")); | |
052b9502 | 1709 | |
d3b1e874 TT |
1710 | cleanup = make_cleanup (free_current_contents, &buffer); |
1711 | ||
052b9502 | 1712 | contents = value_contents_raw (v); |
d3b1e874 | 1713 | bits_to_skip = 8 * value_offset (v); |
0e03807e TT |
1714 | if (value_bitsize (v)) |
1715 | { | |
1716 | bits_to_skip += value_bitpos (v); | |
1717 | type_len = value_bitsize (v); | |
1718 | } | |
1719 | else | |
1720 | type_len = 8 * TYPE_LENGTH (value_type (v)); | |
d3b1e874 | 1721 | |
afd74c5f | 1722 | for (i = 0; i < c->n_pieces && offset < type_len; i++) |
052b9502 NF |
1723 | { |
1724 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
d3b1e874 TT |
1725 | size_t this_size, this_size_bits; |
1726 | long dest_offset_bits, source_offset_bits, source_offset; | |
0d45f56e | 1727 | const gdb_byte *intermediate_buffer; |
d3b1e874 TT |
1728 | |
1729 | /* Compute size, source, and destination offsets for copying, in | |
1730 | bits. */ | |
1731 | this_size_bits = p->size; | |
1732 | if (bits_to_skip > 0 && bits_to_skip >= this_size_bits) | |
afd74c5f | 1733 | { |
d3b1e874 | 1734 | bits_to_skip -= this_size_bits; |
afd74c5f TT |
1735 | continue; |
1736 | } | |
d3b1e874 | 1737 | if (bits_to_skip > 0) |
afd74c5f | 1738 | { |
d3b1e874 TT |
1739 | dest_offset_bits = 0; |
1740 | source_offset_bits = bits_to_skip; | |
1741 | this_size_bits -= bits_to_skip; | |
1742 | bits_to_skip = 0; | |
afd74c5f TT |
1743 | } |
1744 | else | |
1745 | { | |
d3b1e874 TT |
1746 | dest_offset_bits = offset; |
1747 | source_offset_bits = 0; | |
afd74c5f | 1748 | } |
5bd1ef56 TT |
1749 | if (this_size_bits > type_len - offset) |
1750 | this_size_bits = type_len - offset; | |
9a619af0 | 1751 | |
d3b1e874 TT |
1752 | this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8; |
1753 | source_offset = source_offset_bits / 8; | |
1754 | if (buffer_size < this_size) | |
1755 | { | |
1756 | buffer_size = this_size; | |
224c3ddb | 1757 | buffer = (gdb_byte *) xrealloc (buffer, buffer_size); |
d3b1e874 TT |
1758 | } |
1759 | intermediate_buffer = buffer; | |
1760 | ||
1761 | /* Copy from the source to DEST_BUFFER. */ | |
cec03d70 | 1762 | switch (p->location) |
052b9502 | 1763 | { |
cec03d70 TT |
1764 | case DWARF_VALUE_REGISTER: |
1765 | { | |
1766 | struct gdbarch *arch = get_frame_arch (frame); | |
0fde2c53 DE |
1767 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno); |
1768 | int optim, unavail; | |
6b850546 | 1769 | LONGEST reg_offset = source_offset; |
dcbf108f | 1770 | |
0fde2c53 DE |
1771 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG |
1772 | && this_size < register_size (arch, gdb_regnum)) | |
63b4f126 | 1773 | { |
0fde2c53 DE |
1774 | /* Big-endian, and we want less than full size. */ |
1775 | reg_offset = register_size (arch, gdb_regnum) - this_size; | |
1776 | /* We want the lower-order THIS_SIZE_BITS of the bytes | |
1777 | we extract from the register. */ | |
1778 | source_offset_bits += 8 * this_size - this_size_bits; | |
63b4f126 | 1779 | } |
0fde2c53 DE |
1780 | |
1781 | if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset, | |
1782 | this_size, buffer, | |
1783 | &optim, &unavail)) | |
63b4f126 | 1784 | { |
0fde2c53 DE |
1785 | /* Just so garbage doesn't ever shine through. */ |
1786 | memset (buffer, 0, this_size); | |
1787 | ||
1788 | if (optim) | |
1789 | mark_value_bits_optimized_out (v, offset, this_size_bits); | |
1790 | if (unavail) | |
1791 | mark_value_bits_unavailable (v, offset, this_size_bits); | |
63b4f126 | 1792 | } |
cec03d70 TT |
1793 | } |
1794 | break; | |
1795 | ||
1796 | case DWARF_VALUE_MEMORY: | |
e6ca34fc PA |
1797 | read_value_memory (v, offset, |
1798 | p->v.mem.in_stack_memory, | |
1799 | p->v.mem.addr + source_offset, | |
1800 | buffer, this_size); | |
cec03d70 TT |
1801 | break; |
1802 | ||
1803 | case DWARF_VALUE_STACK: | |
1804 | { | |
afd74c5f | 1805 | size_t n = this_size; |
9a619af0 | 1806 | |
afd74c5f TT |
1807 | if (n > c->addr_size - source_offset) |
1808 | n = (c->addr_size >= source_offset | |
1809 | ? c->addr_size - source_offset | |
1810 | : 0); | |
1811 | if (n == 0) | |
1812 | { | |
1813 | /* Nothing. */ | |
1814 | } | |
afd74c5f TT |
1815 | else |
1816 | { | |
8a9b8146 | 1817 | const gdb_byte *val_bytes = value_contents_all (p->v.value); |
afd74c5f | 1818 | |
8a9b8146 | 1819 | intermediate_buffer = val_bytes + source_offset; |
afd74c5f | 1820 | } |
cec03d70 TT |
1821 | } |
1822 | break; | |
1823 | ||
1824 | case DWARF_VALUE_LITERAL: | |
1825 | { | |
afd74c5f TT |
1826 | size_t n = this_size; |
1827 | ||
1828 | if (n > p->v.literal.length - source_offset) | |
1829 | n = (p->v.literal.length >= source_offset | |
1830 | ? p->v.literal.length - source_offset | |
1831 | : 0); | |
1832 | if (n != 0) | |
d3b1e874 | 1833 | intermediate_buffer = p->v.literal.data + source_offset; |
cec03d70 TT |
1834 | } |
1835 | break; | |
1836 | ||
8cf6f0b1 TT |
1837 | /* These bits show up as zeros -- but do not cause the value |
1838 | to be considered optimized-out. */ | |
1839 | case DWARF_VALUE_IMPLICIT_POINTER: | |
1840 | break; | |
1841 | ||
cb826367 | 1842 | case DWARF_VALUE_OPTIMIZED_OUT: |
9a0dc9e3 | 1843 | mark_value_bits_optimized_out (v, offset, this_size_bits); |
cb826367 TT |
1844 | break; |
1845 | ||
cec03d70 TT |
1846 | default: |
1847 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
052b9502 | 1848 | } |
d3b1e874 | 1849 | |
8cf6f0b1 TT |
1850 | if (p->location != DWARF_VALUE_OPTIMIZED_OUT |
1851 | && p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
d3b1e874 TT |
1852 | copy_bitwise (contents, dest_offset_bits, |
1853 | intermediate_buffer, source_offset_bits % 8, | |
1854 | this_size_bits, bits_big_endian); | |
1855 | ||
1856 | offset += this_size_bits; | |
052b9502 | 1857 | } |
d3b1e874 TT |
1858 | |
1859 | do_cleanups (cleanup); | |
052b9502 NF |
1860 | } |
1861 | ||
1862 | static void | |
1863 | write_pieced_value (struct value *to, struct value *from) | |
1864 | { | |
1865 | int i; | |
1866 | long offset = 0; | |
d3b1e874 | 1867 | ULONGEST bits_to_skip; |
afd74c5f | 1868 | const gdb_byte *contents; |
3e43a32a MS |
1869 | struct piece_closure *c |
1870 | = (struct piece_closure *) value_computed_closure (to); | |
052b9502 | 1871 | struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (to)); |
afd74c5f | 1872 | size_t type_len; |
d3b1e874 | 1873 | size_t buffer_size = 0; |
948f8e3d | 1874 | gdb_byte *buffer = NULL; |
d3b1e874 TT |
1875 | struct cleanup *cleanup; |
1876 | int bits_big_endian | |
1877 | = gdbarch_bits_big_endian (get_type_arch (value_type (to))); | |
052b9502 NF |
1878 | |
1879 | if (frame == NULL) | |
1880 | { | |
9a0dc9e3 | 1881 | mark_value_bytes_optimized_out (to, 0, TYPE_LENGTH (value_type (to))); |
052b9502 NF |
1882 | return; |
1883 | } | |
1884 | ||
d3b1e874 TT |
1885 | cleanup = make_cleanup (free_current_contents, &buffer); |
1886 | ||
afd74c5f | 1887 | contents = value_contents (from); |
d3b1e874 | 1888 | bits_to_skip = 8 * value_offset (to); |
0e03807e TT |
1889 | if (value_bitsize (to)) |
1890 | { | |
1891 | bits_to_skip += value_bitpos (to); | |
1892 | type_len = value_bitsize (to); | |
1893 | } | |
1894 | else | |
1895 | type_len = 8 * TYPE_LENGTH (value_type (to)); | |
1896 | ||
afd74c5f | 1897 | for (i = 0; i < c->n_pieces && offset < type_len; i++) |
052b9502 NF |
1898 | { |
1899 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
d3b1e874 TT |
1900 | size_t this_size_bits, this_size; |
1901 | long dest_offset_bits, source_offset_bits, dest_offset, source_offset; | |
1902 | int need_bitwise; | |
1903 | const gdb_byte *source_buffer; | |
afd74c5f | 1904 | |
d3b1e874 TT |
1905 | this_size_bits = p->size; |
1906 | if (bits_to_skip > 0 && bits_to_skip >= this_size_bits) | |
afd74c5f | 1907 | { |
d3b1e874 | 1908 | bits_to_skip -= this_size_bits; |
afd74c5f TT |
1909 | continue; |
1910 | } | |
d3b1e874 TT |
1911 | if (this_size_bits > type_len - offset) |
1912 | this_size_bits = type_len - offset; | |
1913 | if (bits_to_skip > 0) | |
afd74c5f | 1914 | { |
d3b1e874 TT |
1915 | dest_offset_bits = bits_to_skip; |
1916 | source_offset_bits = 0; | |
1917 | this_size_bits -= bits_to_skip; | |
1918 | bits_to_skip = 0; | |
afd74c5f TT |
1919 | } |
1920 | else | |
1921 | { | |
d3b1e874 TT |
1922 | dest_offset_bits = 0; |
1923 | source_offset_bits = offset; | |
1924 | } | |
1925 | ||
1926 | this_size = (this_size_bits + source_offset_bits % 8 + 7) / 8; | |
1927 | source_offset = source_offset_bits / 8; | |
1928 | dest_offset = dest_offset_bits / 8; | |
1929 | if (dest_offset_bits % 8 == 0 && source_offset_bits % 8 == 0) | |
1930 | { | |
1931 | source_buffer = contents + source_offset; | |
1932 | need_bitwise = 0; | |
1933 | } | |
1934 | else | |
1935 | { | |
1936 | if (buffer_size < this_size) | |
1937 | { | |
1938 | buffer_size = this_size; | |
224c3ddb | 1939 | buffer = (gdb_byte *) xrealloc (buffer, buffer_size); |
d3b1e874 TT |
1940 | } |
1941 | source_buffer = buffer; | |
1942 | need_bitwise = 1; | |
afd74c5f | 1943 | } |
9a619af0 | 1944 | |
cec03d70 | 1945 | switch (p->location) |
052b9502 | 1946 | { |
cec03d70 TT |
1947 | case DWARF_VALUE_REGISTER: |
1948 | { | |
1949 | struct gdbarch *arch = get_frame_arch (frame); | |
0fde2c53 DE |
1950 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, p->v.regno); |
1951 | int reg_offset = dest_offset; | |
dcbf108f | 1952 | |
0fde2c53 DE |
1953 | if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG |
1954 | && this_size <= register_size (arch, gdb_regnum)) | |
63b4f126 | 1955 | { |
0fde2c53 DE |
1956 | /* Big-endian, and we want less than full size. */ |
1957 | reg_offset = register_size (arch, gdb_regnum) - this_size; | |
1958 | } | |
ca45ab26 | 1959 | |
0fde2c53 DE |
1960 | if (need_bitwise) |
1961 | { | |
1962 | int optim, unavail; | |
ca45ab26 | 1963 | |
0fde2c53 DE |
1964 | if (!get_frame_register_bytes (frame, gdb_regnum, reg_offset, |
1965 | this_size, buffer, | |
1966 | &optim, &unavail)) | |
d3b1e874 | 1967 | { |
0fde2c53 DE |
1968 | if (optim) |
1969 | throw_error (OPTIMIZED_OUT_ERROR, | |
1970 | _("Can't do read-modify-write to " | |
1971 | "update bitfield; containing word " | |
1972 | "has been optimized out")); | |
1973 | if (unavail) | |
1974 | throw_error (NOT_AVAILABLE_ERROR, | |
1975 | _("Can't do read-modify-write to update " | |
1976 | "bitfield; containing word " | |
1977 | "is unavailable")); | |
d3b1e874 | 1978 | } |
0fde2c53 DE |
1979 | copy_bitwise (buffer, dest_offset_bits, |
1980 | contents, source_offset_bits, | |
1981 | this_size_bits, | |
1982 | bits_big_endian); | |
63b4f126 | 1983 | } |
0fde2c53 DE |
1984 | |
1985 | put_frame_register_bytes (frame, gdb_regnum, reg_offset, | |
1986 | this_size, source_buffer); | |
cec03d70 TT |
1987 | } |
1988 | break; | |
1989 | case DWARF_VALUE_MEMORY: | |
d3b1e874 TT |
1990 | if (need_bitwise) |
1991 | { | |
1992 | /* Only the first and last bytes can possibly have any | |
1993 | bits reused. */ | |
f2c7657e UW |
1994 | read_memory (p->v.mem.addr + dest_offset, buffer, 1); |
1995 | read_memory (p->v.mem.addr + dest_offset + this_size - 1, | |
d3b1e874 TT |
1996 | buffer + this_size - 1, 1); |
1997 | copy_bitwise (buffer, dest_offset_bits, | |
1998 | contents, source_offset_bits, | |
1999 | this_size_bits, | |
2000 | bits_big_endian); | |
2001 | } | |
2002 | ||
f2c7657e | 2003 | write_memory (p->v.mem.addr + dest_offset, |
d3b1e874 | 2004 | source_buffer, this_size); |
cec03d70 TT |
2005 | break; |
2006 | default: | |
9a0dc9e3 | 2007 | mark_value_bytes_optimized_out (to, 0, TYPE_LENGTH (value_type (to))); |
0e03807e | 2008 | break; |
052b9502 | 2009 | } |
d3b1e874 | 2010 | offset += this_size_bits; |
052b9502 | 2011 | } |
d3b1e874 | 2012 | |
d3b1e874 | 2013 | do_cleanups (cleanup); |
052b9502 NF |
2014 | } |
2015 | ||
9a0dc9e3 PA |
2016 | /* An implementation of an lval_funcs method to see whether a value is |
2017 | a synthetic pointer. */ | |
8cf6f0b1 | 2018 | |
0e03807e | 2019 | static int |
6b850546 | 2020 | check_pieced_synthetic_pointer (const struct value *value, LONGEST bit_offset, |
9a0dc9e3 | 2021 | int bit_length) |
0e03807e TT |
2022 | { |
2023 | struct piece_closure *c | |
2024 | = (struct piece_closure *) value_computed_closure (value); | |
2025 | int i; | |
2026 | ||
2027 | bit_offset += 8 * value_offset (value); | |
2028 | if (value_bitsize (value)) | |
2029 | bit_offset += value_bitpos (value); | |
2030 | ||
2031 | for (i = 0; i < c->n_pieces && bit_length > 0; i++) | |
2032 | { | |
2033 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2034 | size_t this_size_bits = p->size; | |
2035 | ||
2036 | if (bit_offset > 0) | |
2037 | { | |
2038 | if (bit_offset >= this_size_bits) | |
2039 | { | |
2040 | bit_offset -= this_size_bits; | |
2041 | continue; | |
2042 | } | |
2043 | ||
2044 | bit_length -= this_size_bits - bit_offset; | |
2045 | bit_offset = 0; | |
2046 | } | |
2047 | else | |
2048 | bit_length -= this_size_bits; | |
2049 | ||
9a0dc9e3 PA |
2050 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) |
2051 | return 0; | |
0e03807e TT |
2052 | } |
2053 | ||
9a0dc9e3 | 2054 | return 1; |
8cf6f0b1 TT |
2055 | } |
2056 | ||
2057 | /* A wrapper function for get_frame_address_in_block. */ | |
2058 | ||
2059 | static CORE_ADDR | |
2060 | get_frame_address_in_block_wrapper (void *baton) | |
2061 | { | |
9a3c8263 | 2062 | return get_frame_address_in_block ((struct frame_info *) baton); |
8cf6f0b1 TT |
2063 | } |
2064 | ||
3326303b MG |
2065 | /* Fetch a DW_AT_const_value through a synthetic pointer. */ |
2066 | ||
2067 | static struct value * | |
2068 | fetch_const_value_from_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
2069 | struct dwarf2_per_cu_data *per_cu, | |
2070 | struct type *type) | |
2071 | { | |
2072 | struct value *result = NULL; | |
2073 | struct obstack temp_obstack; | |
2074 | struct cleanup *cleanup; | |
2075 | const gdb_byte *bytes; | |
2076 | LONGEST len; | |
2077 | ||
2078 | obstack_init (&temp_obstack); | |
2079 | cleanup = make_cleanup_obstack_free (&temp_obstack); | |
2080 | bytes = dwarf2_fetch_constant_bytes (die, per_cu, &temp_obstack, &len); | |
2081 | ||
2082 | if (bytes != NULL) | |
2083 | { | |
2084 | if (byte_offset >= 0 | |
2085 | && byte_offset + TYPE_LENGTH (TYPE_TARGET_TYPE (type)) <= len) | |
2086 | { | |
2087 | bytes += byte_offset; | |
2088 | result = value_from_contents (TYPE_TARGET_TYPE (type), bytes); | |
2089 | } | |
2090 | else | |
2091 | invalid_synthetic_pointer (); | |
2092 | } | |
2093 | else | |
2094 | result = allocate_optimized_out_value (TYPE_TARGET_TYPE (type)); | |
2095 | ||
2096 | do_cleanups (cleanup); | |
2097 | ||
2098 | return result; | |
2099 | } | |
2100 | ||
2101 | /* Fetch the value pointed to by a synthetic pointer. */ | |
2102 | ||
2103 | static struct value * | |
2104 | indirect_synthetic_pointer (sect_offset die, LONGEST byte_offset, | |
2105 | struct dwarf2_per_cu_data *per_cu, | |
2106 | struct frame_info *frame, struct type *type) | |
2107 | { | |
2108 | /* Fetch the location expression of the DIE we're pointing to. */ | |
2109 | struct dwarf2_locexpr_baton baton | |
2110 | = dwarf2_fetch_die_loc_sect_off (die, per_cu, | |
2111 | get_frame_address_in_block_wrapper, frame); | |
2112 | ||
2113 | /* If pointed-to DIE has a DW_AT_location, evaluate it and return the | |
2114 | resulting value. Otherwise, it may have a DW_AT_const_value instead, | |
2115 | or it may've been optimized out. */ | |
2116 | if (baton.data != NULL) | |
2117 | return dwarf2_evaluate_loc_desc_full (TYPE_TARGET_TYPE (type), frame, | |
2118 | baton.data, baton.size, baton.per_cu, | |
2119 | byte_offset); | |
2120 | else | |
2121 | return fetch_const_value_from_synthetic_pointer (die, byte_offset, per_cu, | |
2122 | type); | |
2123 | } | |
2124 | ||
8cf6f0b1 TT |
2125 | /* An implementation of an lval_funcs method to indirect through a |
2126 | pointer. This handles the synthetic pointer case when needed. */ | |
2127 | ||
2128 | static struct value * | |
2129 | indirect_pieced_value (struct value *value) | |
2130 | { | |
2131 | struct piece_closure *c | |
2132 | = (struct piece_closure *) value_computed_closure (value); | |
2133 | struct type *type; | |
2134 | struct frame_info *frame; | |
2135 | struct dwarf2_locexpr_baton baton; | |
6b850546 DT |
2136 | int i, bit_length; |
2137 | LONGEST bit_offset; | |
8cf6f0b1 | 2138 | struct dwarf_expr_piece *piece = NULL; |
8cf6f0b1 | 2139 | LONGEST byte_offset; |
b597c318 | 2140 | enum bfd_endian byte_order; |
8cf6f0b1 | 2141 | |
0e37a63c | 2142 | type = check_typedef (value_type (value)); |
8cf6f0b1 TT |
2143 | if (TYPE_CODE (type) != TYPE_CODE_PTR) |
2144 | return NULL; | |
2145 | ||
2146 | bit_length = 8 * TYPE_LENGTH (type); | |
2147 | bit_offset = 8 * value_offset (value); | |
2148 | if (value_bitsize (value)) | |
2149 | bit_offset += value_bitpos (value); | |
2150 | ||
2151 | for (i = 0; i < c->n_pieces && bit_length > 0; i++) | |
2152 | { | |
2153 | struct dwarf_expr_piece *p = &c->pieces[i]; | |
2154 | size_t this_size_bits = p->size; | |
2155 | ||
2156 | if (bit_offset > 0) | |
2157 | { | |
2158 | if (bit_offset >= this_size_bits) | |
2159 | { | |
2160 | bit_offset -= this_size_bits; | |
2161 | continue; | |
2162 | } | |
2163 | ||
2164 | bit_length -= this_size_bits - bit_offset; | |
2165 | bit_offset = 0; | |
2166 | } | |
2167 | else | |
2168 | bit_length -= this_size_bits; | |
2169 | ||
2170 | if (p->location != DWARF_VALUE_IMPLICIT_POINTER) | |
2171 | return NULL; | |
2172 | ||
2173 | if (bit_length != 0) | |
2174 | error (_("Invalid use of DW_OP_GNU_implicit_pointer")); | |
2175 | ||
2176 | piece = p; | |
2177 | break; | |
2178 | } | |
2179 | ||
3326303b | 2180 | gdb_assert (piece != NULL); |
8cf6f0b1 | 2181 | frame = get_selected_frame (_("No frame selected.")); |
543305c9 | 2182 | |
5bd1ef56 TT |
2183 | /* This is an offset requested by GDB, such as value subscripts. |
2184 | However, due to how synthetic pointers are implemented, this is | |
2185 | always presented to us as a pointer type. This means we have to | |
b597c318 YQ |
2186 | sign-extend it manually as appropriate. Use raw |
2187 | extract_signed_integer directly rather than value_as_address and | |
2188 | sign extend afterwards on architectures that would need it | |
2189 | (mostly everywhere except MIPS, which has signed addresses) as | |
2190 | the later would go through gdbarch_pointer_to_address and thus | |
2191 | return a CORE_ADDR with high bits set on architectures that | |
2192 | encode address spaces and other things in CORE_ADDR. */ | |
2193 | byte_order = gdbarch_byte_order (get_frame_arch (frame)); | |
2194 | byte_offset = extract_signed_integer (value_contents (value), | |
2195 | TYPE_LENGTH (type), byte_order); | |
5bd1ef56 | 2196 | byte_offset += piece->v.ptr.offset; |
8cf6f0b1 | 2197 | |
3326303b MG |
2198 | return indirect_synthetic_pointer (piece->v.ptr.die, byte_offset, c->per_cu, |
2199 | frame, type); | |
2200 | } | |
8cf6f0b1 | 2201 | |
3326303b MG |
2202 | /* Implementation of the coerce_ref method of lval_funcs for synthetic C++ |
2203 | references. */ | |
b6807d98 | 2204 | |
3326303b MG |
2205 | static struct value * |
2206 | coerce_pieced_ref (const struct value *value) | |
2207 | { | |
2208 | struct type *type = check_typedef (value_type (value)); | |
b6807d98 | 2209 | |
3326303b MG |
2210 | if (value_bits_synthetic_pointer (value, value_embedded_offset (value), |
2211 | TARGET_CHAR_BIT * TYPE_LENGTH (type))) | |
2212 | { | |
2213 | const struct piece_closure *closure | |
2214 | = (struct piece_closure *) value_computed_closure (value); | |
2215 | struct frame_info *frame | |
2216 | = get_selected_frame (_("No frame selected.")); | |
2217 | ||
2218 | /* gdb represents synthetic pointers as pieced values with a single | |
2219 | piece. */ | |
2220 | gdb_assert (closure != NULL); | |
2221 | gdb_assert (closure->n_pieces == 1); | |
2222 | ||
2223 | return indirect_synthetic_pointer (closure->pieces->v.ptr.die, | |
2224 | closure->pieces->v.ptr.offset, | |
2225 | closure->per_cu, frame, type); | |
2226 | } | |
2227 | else | |
2228 | { | |
2229 | /* Else: not a synthetic reference; do nothing. */ | |
2230 | return NULL; | |
2231 | } | |
0e03807e TT |
2232 | } |
2233 | ||
052b9502 | 2234 | static void * |
0e03807e | 2235 | copy_pieced_value_closure (const struct value *v) |
052b9502 | 2236 | { |
3e43a32a MS |
2237 | struct piece_closure *c |
2238 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2239 | |
88bfdde4 TT |
2240 | ++c->refc; |
2241 | return c; | |
052b9502 NF |
2242 | } |
2243 | ||
2244 | static void | |
2245 | free_pieced_value_closure (struct value *v) | |
2246 | { | |
3e43a32a MS |
2247 | struct piece_closure *c |
2248 | = (struct piece_closure *) value_computed_closure (v); | |
052b9502 | 2249 | |
88bfdde4 TT |
2250 | --c->refc; |
2251 | if (c->refc == 0) | |
2252 | { | |
8a9b8146 TT |
2253 | int i; |
2254 | ||
2255 | for (i = 0; i < c->n_pieces; ++i) | |
2256 | if (c->pieces[i].location == DWARF_VALUE_STACK) | |
2257 | value_free (c->pieces[i].v.value); | |
2258 | ||
88bfdde4 TT |
2259 | xfree (c->pieces); |
2260 | xfree (c); | |
2261 | } | |
052b9502 NF |
2262 | } |
2263 | ||
2264 | /* Functions for accessing a variable described by DW_OP_piece. */ | |
c8f2448a | 2265 | static const struct lval_funcs pieced_value_funcs = { |
052b9502 NF |
2266 | read_pieced_value, |
2267 | write_pieced_value, | |
8cf6f0b1 | 2268 | indirect_pieced_value, |
3326303b | 2269 | coerce_pieced_ref, |
8cf6f0b1 | 2270 | check_pieced_synthetic_pointer, |
052b9502 NF |
2271 | copy_pieced_value_closure, |
2272 | free_pieced_value_closure | |
2273 | }; | |
2274 | ||
9e8b7a03 JK |
2275 | /* Virtual method table for dwarf2_evaluate_loc_desc_full below. */ |
2276 | ||
e36122e9 | 2277 | const struct dwarf_expr_context_funcs dwarf_expr_ctx_funcs = |
9e8b7a03 | 2278 | { |
b1370418 | 2279 | dwarf_expr_read_addr_from_reg, |
0acf8b65 | 2280 | dwarf_expr_get_reg_value, |
9e8b7a03 JK |
2281 | dwarf_expr_read_mem, |
2282 | dwarf_expr_frame_base, | |
2283 | dwarf_expr_frame_cfa, | |
2284 | dwarf_expr_frame_pc, | |
2285 | dwarf_expr_tls_address, | |
2286 | dwarf_expr_dwarf_call, | |
8e3b41a9 | 2287 | dwarf_expr_get_base_type, |
3019eac3 | 2288 | dwarf_expr_push_dwarf_reg_entry_value, |
08412b07 JB |
2289 | dwarf_expr_get_addr_index, |
2290 | dwarf_expr_get_obj_addr | |
9e8b7a03 JK |
2291 | }; |
2292 | ||
4c2df51b | 2293 | /* Evaluate a location description, starting at DATA and with length |
8cf6f0b1 TT |
2294 | SIZE, to find the current location of variable of TYPE in the |
2295 | context of FRAME. BYTE_OFFSET is applied after the contents are | |
2296 | computed. */ | |
a2d33775 | 2297 | |
8cf6f0b1 TT |
2298 | static struct value * |
2299 | dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame, | |
56eb65bd | 2300 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2301 | struct dwarf2_per_cu_data *per_cu, |
2302 | LONGEST byte_offset) | |
4c2df51b | 2303 | { |
4c2df51b DJ |
2304 | struct value *retval; |
2305 | struct dwarf_expr_baton baton; | |
2306 | struct dwarf_expr_context *ctx; | |
72fc29ff | 2307 | struct cleanup *old_chain, *value_chain; |
ac56253d | 2308 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b | 2309 | |
8cf6f0b1 TT |
2310 | if (byte_offset < 0) |
2311 | invalid_synthetic_pointer (); | |
2312 | ||
0d53c4c4 | 2313 | if (size == 0) |
a7035dbb | 2314 | return allocate_optimized_out_value (type); |
0d53c4c4 | 2315 | |
4c2df51b | 2316 | baton.frame = frame; |
17ea53c3 | 2317 | baton.per_cu = per_cu; |
08412b07 | 2318 | baton.obj_address = 0; |
4c2df51b DJ |
2319 | |
2320 | ctx = new_dwarf_expr_context (); | |
4a227398 | 2321 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 2322 | value_chain = make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 2323 | |
ac56253d | 2324 | ctx->gdbarch = get_objfile_arch (objfile); |
ae0d2f24 | 2325 | ctx->addr_size = dwarf2_per_cu_addr_size (per_cu); |
181cebd4 | 2326 | ctx->ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); |
9aa1f1e3 | 2327 | ctx->offset = dwarf2_per_cu_text_offset (per_cu); |
4c2df51b | 2328 | ctx->baton = &baton; |
9e8b7a03 | 2329 | ctx->funcs = &dwarf_expr_ctx_funcs; |
4c2df51b | 2330 | |
492d29ea | 2331 | TRY |
79e1a869 PA |
2332 | { |
2333 | dwarf_expr_eval (ctx, data, size); | |
2334 | } | |
492d29ea | 2335 | CATCH (ex, RETURN_MASK_ERROR) |
79e1a869 PA |
2336 | { |
2337 | if (ex.error == NOT_AVAILABLE_ERROR) | |
2338 | { | |
72fc29ff | 2339 | do_cleanups (old_chain); |
79e1a869 PA |
2340 | retval = allocate_value (type); |
2341 | mark_value_bytes_unavailable (retval, 0, TYPE_LENGTH (type)); | |
2342 | return retval; | |
2343 | } | |
8e3b41a9 JK |
2344 | else if (ex.error == NO_ENTRY_VALUE_ERROR) |
2345 | { | |
2346 | if (entry_values_debug) | |
2347 | exception_print (gdb_stdout, ex); | |
2348 | do_cleanups (old_chain); | |
2349 | return allocate_optimized_out_value (type); | |
2350 | } | |
79e1a869 PA |
2351 | else |
2352 | throw_exception (ex); | |
2353 | } | |
492d29ea | 2354 | END_CATCH |
79e1a869 | 2355 | |
87808bd6 JB |
2356 | if (ctx->num_pieces > 0) |
2357 | { | |
052b9502 NF |
2358 | struct piece_closure *c; |
2359 | struct frame_id frame_id = get_frame_id (frame); | |
8cf6f0b1 TT |
2360 | ULONGEST bit_size = 0; |
2361 | int i; | |
052b9502 | 2362 | |
8cf6f0b1 TT |
2363 | for (i = 0; i < ctx->num_pieces; ++i) |
2364 | bit_size += ctx->pieces[i].size; | |
2365 | if (8 * (byte_offset + TYPE_LENGTH (type)) > bit_size) | |
2366 | invalid_synthetic_pointer (); | |
2367 | ||
2368 | c = allocate_piece_closure (per_cu, ctx->num_pieces, ctx->pieces, | |
6063c216 | 2369 | ctx->addr_size); |
72fc29ff TT |
2370 | /* We must clean up the value chain after creating the piece |
2371 | closure but before allocating the result. */ | |
2372 | do_cleanups (value_chain); | |
a2d33775 | 2373 | retval = allocate_computed_value (type, &pieced_value_funcs, c); |
052b9502 | 2374 | VALUE_FRAME_ID (retval) = frame_id; |
8cf6f0b1 | 2375 | set_value_offset (retval, byte_offset); |
87808bd6 | 2376 | } |
4c2df51b DJ |
2377 | else |
2378 | { | |
cec03d70 TT |
2379 | switch (ctx->location) |
2380 | { | |
2381 | case DWARF_VALUE_REGISTER: | |
2382 | { | |
2383 | struct gdbarch *arch = get_frame_arch (frame); | |
7c33b57c PA |
2384 | int dwarf_regnum |
2385 | = longest_to_int (value_as_long (dwarf_expr_fetch (ctx, 0))); | |
0fde2c53 | 2386 | int gdb_regnum = dwarf_reg_to_regnum_or_error (arch, dwarf_regnum); |
9a619af0 | 2387 | |
8cf6f0b1 TT |
2388 | if (byte_offset != 0) |
2389 | error (_("cannot use offset on synthetic pointer to register")); | |
72fc29ff | 2390 | do_cleanups (value_chain); |
0fde2c53 DE |
2391 | retval = value_from_register (type, gdb_regnum, frame); |
2392 | if (value_optimized_out (retval)) | |
2393 | { | |
2394 | struct value *tmp; | |
2395 | ||
2396 | /* This means the register has undefined value / was | |
2397 | not saved. As we're computing the location of some | |
2398 | variable etc. in the program, not a value for | |
2399 | inspecting a register ($pc, $sp, etc.), return a | |
2400 | generic optimized out value instead, so that we show | |
2401 | <optimized out> instead of <not saved>. */ | |
2402 | do_cleanups (value_chain); | |
2403 | tmp = allocate_value (type); | |
2404 | value_contents_copy (tmp, 0, retval, 0, TYPE_LENGTH (type)); | |
2405 | retval = tmp; | |
2406 | } | |
cec03d70 TT |
2407 | } |
2408 | break; | |
2409 | ||
2410 | case DWARF_VALUE_MEMORY: | |
2411 | { | |
f56331b4 | 2412 | struct type *ptr_type; |
f2c7657e | 2413 | CORE_ADDR address = dwarf_expr_fetch_address (ctx, 0); |
44353522 | 2414 | int in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0); |
cec03d70 | 2415 | |
f56331b4 KB |
2416 | /* DW_OP_deref_size (and possibly other operations too) may |
2417 | create a pointer instead of an address. Ideally, the | |
2418 | pointer to address conversion would be performed as part | |
2419 | of those operations, but the type of the object to | |
2420 | which the address refers is not known at the time of | |
2421 | the operation. Therefore, we do the conversion here | |
2422 | since the type is readily available. */ | |
2423 | ||
2424 | switch (TYPE_CODE (type)) | |
2425 | { | |
2426 | case TYPE_CODE_FUNC: | |
2427 | case TYPE_CODE_METHOD: | |
2428 | ptr_type = builtin_type (ctx->gdbarch)->builtin_func_ptr; | |
2429 | break; | |
2430 | default: | |
2431 | ptr_type = builtin_type (ctx->gdbarch)->builtin_data_ptr; | |
2432 | break; | |
2433 | } | |
2434 | address = value_as_address (value_from_pointer (ptr_type, address)); | |
2435 | ||
72fc29ff | 2436 | do_cleanups (value_chain); |
08039c9e | 2437 | retval = value_at_lazy (type, address + byte_offset); |
44353522 DE |
2438 | if (in_stack_memory) |
2439 | set_value_stack (retval, 1); | |
cec03d70 TT |
2440 | } |
2441 | break; | |
2442 | ||
2443 | case DWARF_VALUE_STACK: | |
2444 | { | |
8a9b8146 TT |
2445 | struct value *value = dwarf_expr_fetch (ctx, 0); |
2446 | gdb_byte *contents; | |
2447 | const gdb_byte *val_bytes; | |
2448 | size_t n = TYPE_LENGTH (value_type (value)); | |
cec03d70 | 2449 | |
8cf6f0b1 TT |
2450 | if (byte_offset + TYPE_LENGTH (type) > n) |
2451 | invalid_synthetic_pointer (); | |
2452 | ||
8a9b8146 TT |
2453 | val_bytes = value_contents_all (value); |
2454 | val_bytes += byte_offset; | |
8cf6f0b1 TT |
2455 | n -= byte_offset; |
2456 | ||
72fc29ff TT |
2457 | /* Preserve VALUE because we are going to free values back |
2458 | to the mark, but we still need the value contents | |
2459 | below. */ | |
2460 | value_incref (value); | |
2461 | do_cleanups (value_chain); | |
2462 | make_cleanup_value_free (value); | |
2463 | ||
a2d33775 | 2464 | retval = allocate_value (type); |
cec03d70 | 2465 | contents = value_contents_raw (retval); |
a2d33775 | 2466 | if (n > TYPE_LENGTH (type)) |
b6cede78 JK |
2467 | { |
2468 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
2469 | ||
2470 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2471 | val_bytes += n - TYPE_LENGTH (type); | |
2472 | n = TYPE_LENGTH (type); | |
2473 | } | |
8a9b8146 | 2474 | memcpy (contents, val_bytes, n); |
cec03d70 TT |
2475 | } |
2476 | break; | |
2477 | ||
2478 | case DWARF_VALUE_LITERAL: | |
2479 | { | |
2480 | bfd_byte *contents; | |
8c814cdd | 2481 | const bfd_byte *ldata; |
cec03d70 TT |
2482 | size_t n = ctx->len; |
2483 | ||
8cf6f0b1 TT |
2484 | if (byte_offset + TYPE_LENGTH (type) > n) |
2485 | invalid_synthetic_pointer (); | |
2486 | ||
72fc29ff | 2487 | do_cleanups (value_chain); |
a2d33775 | 2488 | retval = allocate_value (type); |
cec03d70 | 2489 | contents = value_contents_raw (retval); |
8cf6f0b1 | 2490 | |
8c814cdd | 2491 | ldata = ctx->data + byte_offset; |
8cf6f0b1 TT |
2492 | n -= byte_offset; |
2493 | ||
a2d33775 | 2494 | if (n > TYPE_LENGTH (type)) |
b6cede78 JK |
2495 | { |
2496 | struct gdbarch *objfile_gdbarch = get_objfile_arch (objfile); | |
2497 | ||
2498 | if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG) | |
2499 | ldata += n - TYPE_LENGTH (type); | |
2500 | n = TYPE_LENGTH (type); | |
2501 | } | |
8c814cdd | 2502 | memcpy (contents, ldata, n); |
cec03d70 TT |
2503 | } |
2504 | break; | |
2505 | ||
dd90784c | 2506 | case DWARF_VALUE_OPTIMIZED_OUT: |
72fc29ff | 2507 | do_cleanups (value_chain); |
a7035dbb | 2508 | retval = allocate_optimized_out_value (type); |
dd90784c JK |
2509 | break; |
2510 | ||
8cf6f0b1 TT |
2511 | /* DWARF_VALUE_IMPLICIT_POINTER was converted to a pieced |
2512 | operation by execute_stack_op. */ | |
2513 | case DWARF_VALUE_IMPLICIT_POINTER: | |
cb826367 TT |
2514 | /* DWARF_VALUE_OPTIMIZED_OUT can't occur in this context -- |
2515 | it can only be encountered when making a piece. */ | |
cec03d70 TT |
2516 | default: |
2517 | internal_error (__FILE__, __LINE__, _("invalid location type")); | |
2518 | } | |
4c2df51b DJ |
2519 | } |
2520 | ||
42be36b3 CT |
2521 | set_value_initialized (retval, ctx->initialized); |
2522 | ||
4a227398 | 2523 | do_cleanups (old_chain); |
4c2df51b DJ |
2524 | |
2525 | return retval; | |
2526 | } | |
8cf6f0b1 TT |
2527 | |
2528 | /* The exported interface to dwarf2_evaluate_loc_desc_full; it always | |
2529 | passes 0 as the byte_offset. */ | |
2530 | ||
2531 | struct value * | |
2532 | dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame, | |
56eb65bd | 2533 | const gdb_byte *data, size_t size, |
8cf6f0b1 TT |
2534 | struct dwarf2_per_cu_data *per_cu) |
2535 | { | |
2536 | return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, 0); | |
2537 | } | |
2538 | ||
80180f79 | 2539 | /* Evaluates a dwarf expression and stores the result in VAL, expecting |
63e43d3a PMR |
2540 | that the dwarf expression only produces a single CORE_ADDR. FRAME is the |
2541 | frame in which the expression is evaluated. ADDR is a context (location of | |
2542 | a variable) and might be needed to evaluate the location expression. | |
80180f79 SA |
2543 | Returns 1 on success, 0 otherwise. */ |
2544 | ||
2545 | static int | |
2546 | dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton, | |
63e43d3a | 2547 | struct frame_info *frame, |
08412b07 | 2548 | CORE_ADDR addr, |
1cfdf534 | 2549 | CORE_ADDR *valp) |
80180f79 SA |
2550 | { |
2551 | struct dwarf_expr_context *ctx; | |
2552 | struct dwarf_expr_baton baton; | |
2553 | struct objfile *objfile; | |
2554 | struct cleanup *cleanup; | |
2555 | ||
2556 | if (dlbaton == NULL || dlbaton->size == 0) | |
2557 | return 0; | |
2558 | ||
2559 | ctx = new_dwarf_expr_context (); | |
2560 | cleanup = make_cleanup_free_dwarf_expr_context (ctx); | |
2561 | ||
63e43d3a | 2562 | baton.frame = frame; |
80180f79 | 2563 | baton.per_cu = dlbaton->per_cu; |
08412b07 | 2564 | baton.obj_address = addr; |
80180f79 SA |
2565 | |
2566 | objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); | |
2567 | ||
2568 | ctx->gdbarch = get_objfile_arch (objfile); | |
2569 | ctx->addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
2570 | ctx->ref_addr_size = dwarf2_per_cu_ref_addr_size (dlbaton->per_cu); | |
2571 | ctx->offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); | |
2572 | ctx->funcs = &dwarf_expr_ctx_funcs; | |
2573 | ctx->baton = &baton; | |
2574 | ||
2575 | dwarf_expr_eval (ctx, dlbaton->data, dlbaton->size); | |
2576 | ||
2577 | switch (ctx->location) | |
2578 | { | |
2579 | case DWARF_VALUE_REGISTER: | |
2580 | case DWARF_VALUE_MEMORY: | |
2581 | case DWARF_VALUE_STACK: | |
2582 | *valp = dwarf_expr_fetch_address (ctx, 0); | |
2583 | if (ctx->location == DWARF_VALUE_REGISTER) | |
2584 | *valp = dwarf_expr_read_addr_from_reg (&baton, *valp); | |
2585 | do_cleanups (cleanup); | |
2586 | return 1; | |
2587 | case DWARF_VALUE_LITERAL: | |
2588 | *valp = extract_signed_integer (ctx->data, ctx->len, | |
2589 | gdbarch_byte_order (ctx->gdbarch)); | |
2590 | do_cleanups (cleanup); | |
2591 | return 1; | |
2592 | /* Unsupported dwarf values. */ | |
2593 | case DWARF_VALUE_OPTIMIZED_OUT: | |
2594 | case DWARF_VALUE_IMPLICIT_POINTER: | |
2595 | break; | |
2596 | } | |
2597 | ||
2598 | do_cleanups (cleanup); | |
2599 | return 0; | |
2600 | } | |
2601 | ||
2602 | /* See dwarf2loc.h. */ | |
2603 | ||
2604 | int | |
08412b07 | 2605 | dwarf2_evaluate_property (const struct dynamic_prop *prop, |
63e43d3a | 2606 | struct frame_info *frame, |
df25ebbd JB |
2607 | struct property_addr_info *addr_stack, |
2608 | CORE_ADDR *value) | |
80180f79 SA |
2609 | { |
2610 | if (prop == NULL) | |
2611 | return 0; | |
2612 | ||
63e43d3a PMR |
2613 | if (frame == NULL && has_stack_frames ()) |
2614 | frame = get_selected_frame (NULL); | |
2615 | ||
80180f79 SA |
2616 | switch (prop->kind) |
2617 | { | |
2618 | case PROP_LOCEXPR: | |
2619 | { | |
9a3c8263 SM |
2620 | const struct dwarf2_property_baton *baton |
2621 | = (const struct dwarf2_property_baton *) prop->data.baton; | |
80180f79 | 2622 | |
63e43d3a PMR |
2623 | if (dwarf2_locexpr_baton_eval (&baton->locexpr, frame, |
2624 | addr_stack ? addr_stack->addr : 0, | |
df25ebbd | 2625 | value)) |
80180f79 SA |
2626 | { |
2627 | if (baton->referenced_type) | |
2628 | { | |
2629 | struct value *val = value_at (baton->referenced_type, *value); | |
2630 | ||
2631 | *value = value_as_address (val); | |
2632 | } | |
2633 | return 1; | |
2634 | } | |
2635 | } | |
2636 | break; | |
2637 | ||
2638 | case PROP_LOCLIST: | |
2639 | { | |
9a3c8263 SM |
2640 | struct dwarf2_property_baton *baton |
2641 | = (struct dwarf2_property_baton *) prop->data.baton; | |
80180f79 SA |
2642 | CORE_ADDR pc = get_frame_address_in_block (frame); |
2643 | const gdb_byte *data; | |
2644 | struct value *val; | |
2645 | size_t size; | |
2646 | ||
2647 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2648 | if (data != NULL) | |
2649 | { | |
2650 | val = dwarf2_evaluate_loc_desc (baton->referenced_type, frame, data, | |
2651 | size, baton->loclist.per_cu); | |
2652 | if (!value_optimized_out (val)) | |
2653 | { | |
2654 | *value = value_as_address (val); | |
2655 | return 1; | |
2656 | } | |
2657 | } | |
2658 | } | |
2659 | break; | |
2660 | ||
2661 | case PROP_CONST: | |
2662 | *value = prop->data.const_val; | |
2663 | return 1; | |
df25ebbd JB |
2664 | |
2665 | case PROP_ADDR_OFFSET: | |
2666 | { | |
9a3c8263 SM |
2667 | struct dwarf2_property_baton *baton |
2668 | = (struct dwarf2_property_baton *) prop->data.baton; | |
df25ebbd JB |
2669 | struct property_addr_info *pinfo; |
2670 | struct value *val; | |
2671 | ||
2672 | for (pinfo = addr_stack; pinfo != NULL; pinfo = pinfo->next) | |
2673 | if (pinfo->type == baton->referenced_type) | |
2674 | break; | |
2675 | if (pinfo == NULL) | |
2c811c0f | 2676 | error (_("cannot find reference address for offset property")); |
c3345124 JB |
2677 | if (pinfo->valaddr != NULL) |
2678 | val = value_from_contents | |
2679 | (baton->offset_info.type, | |
2680 | pinfo->valaddr + baton->offset_info.offset); | |
2681 | else | |
2682 | val = value_at (baton->offset_info.type, | |
2683 | pinfo->addr + baton->offset_info.offset); | |
df25ebbd JB |
2684 | *value = value_as_address (val); |
2685 | return 1; | |
2686 | } | |
80180f79 SA |
2687 | } |
2688 | ||
2689 | return 0; | |
2690 | } | |
2691 | ||
bb2ec1b3 TT |
2692 | /* See dwarf2loc.h. */ |
2693 | ||
2694 | void | |
2695 | dwarf2_compile_property_to_c (struct ui_file *stream, | |
2696 | const char *result_name, | |
2697 | struct gdbarch *gdbarch, | |
2698 | unsigned char *registers_used, | |
2699 | const struct dynamic_prop *prop, | |
2700 | CORE_ADDR pc, | |
2701 | struct symbol *sym) | |
2702 | { | |
9a3c8263 SM |
2703 | struct dwarf2_property_baton *baton |
2704 | = (struct dwarf2_property_baton *) prop->data.baton; | |
bb2ec1b3 TT |
2705 | const gdb_byte *data; |
2706 | size_t size; | |
2707 | struct dwarf2_per_cu_data *per_cu; | |
2708 | ||
2709 | if (prop->kind == PROP_LOCEXPR) | |
2710 | { | |
2711 | data = baton->locexpr.data; | |
2712 | size = baton->locexpr.size; | |
2713 | per_cu = baton->locexpr.per_cu; | |
2714 | } | |
2715 | else | |
2716 | { | |
2717 | gdb_assert (prop->kind == PROP_LOCLIST); | |
2718 | ||
2719 | data = dwarf2_find_location_expression (&baton->loclist, &size, pc); | |
2720 | per_cu = baton->loclist.per_cu; | |
2721 | } | |
2722 | ||
2723 | compile_dwarf_bounds_to_c (stream, result_name, prop, sym, pc, | |
2724 | gdbarch, registers_used, | |
2725 | dwarf2_per_cu_addr_size (per_cu), | |
2726 | data, data + size, per_cu); | |
2727 | } | |
2728 | ||
4c2df51b | 2729 | \f |
0b31a4bc | 2730 | /* Helper functions and baton for dwarf2_loc_desc_get_symbol_read_needs. */ |
4c2df51b | 2731 | |
0b31a4bc | 2732 | struct symbol_needs_baton |
4c2df51b | 2733 | { |
0b31a4bc | 2734 | enum symbol_needs_kind needs; |
17ea53c3 | 2735 | struct dwarf2_per_cu_data *per_cu; |
4c2df51b DJ |
2736 | }; |
2737 | ||
2738 | /* Reads from registers do require a frame. */ | |
2739 | static CORE_ADDR | |
0b31a4bc | 2740 | symbol_needs_read_addr_from_reg (void *baton, int regnum) |
4c2df51b | 2741 | { |
0b31a4bc | 2742 | struct symbol_needs_baton *nf_baton = (struct symbol_needs_baton *) baton; |
9a619af0 | 2743 | |
0b31a4bc | 2744 | nf_baton->needs = SYMBOL_NEEDS_FRAME; |
4c2df51b DJ |
2745 | return 1; |
2746 | } | |
2747 | ||
0acf8b65 JB |
2748 | /* struct dwarf_expr_context_funcs' "get_reg_value" callback: |
2749 | Reads from registers do require a frame. */ | |
2750 | ||
2751 | static struct value * | |
0b31a4bc | 2752 | symbol_needs_get_reg_value (void *baton, struct type *type, int regnum) |
0acf8b65 | 2753 | { |
0b31a4bc | 2754 | struct symbol_needs_baton *nf_baton = (struct symbol_needs_baton *) baton; |
0acf8b65 | 2755 | |
0b31a4bc | 2756 | nf_baton->needs = SYMBOL_NEEDS_FRAME; |
0acf8b65 JB |
2757 | return value_zero (type, not_lval); |
2758 | } | |
2759 | ||
4c2df51b DJ |
2760 | /* Reads from memory do not require a frame. */ |
2761 | static void | |
0b31a4bc | 2762 | symbol_needs_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len) |
4c2df51b DJ |
2763 | { |
2764 | memset (buf, 0, len); | |
2765 | } | |
2766 | ||
2767 | /* Frame-relative accesses do require a frame. */ | |
2768 | static void | |
0b31a4bc | 2769 | symbol_needs_frame_base (void *baton, const gdb_byte **start, size_t * length) |
4c2df51b | 2770 | { |
852483bc | 2771 | static gdb_byte lit0 = DW_OP_lit0; |
0b31a4bc | 2772 | struct symbol_needs_baton *nf_baton = (struct symbol_needs_baton *) baton; |
4c2df51b DJ |
2773 | |
2774 | *start = &lit0; | |
2775 | *length = 1; | |
2776 | ||
0b31a4bc | 2777 | nf_baton->needs = SYMBOL_NEEDS_FRAME; |
4c2df51b DJ |
2778 | } |
2779 | ||
e7802207 TT |
2780 | /* CFA accesses require a frame. */ |
2781 | ||
2782 | static CORE_ADDR | |
0b31a4bc | 2783 | symbol_needs_frame_cfa (void *baton) |
e7802207 | 2784 | { |
0b31a4bc | 2785 | struct symbol_needs_baton *nf_baton = (struct symbol_needs_baton *) baton; |
9a619af0 | 2786 | |
0b31a4bc | 2787 | nf_baton->needs = SYMBOL_NEEDS_FRAME; |
e7802207 TT |
2788 | return 1; |
2789 | } | |
2790 | ||
0b31a4bc | 2791 | /* Thread-local accesses require registers, but not a frame. */ |
4c2df51b | 2792 | static CORE_ADDR |
0b31a4bc | 2793 | symbol_needs_tls_address (void *baton, CORE_ADDR offset) |
4c2df51b | 2794 | { |
0b31a4bc | 2795 | struct symbol_needs_baton *nf_baton = (struct symbol_needs_baton *) baton; |
9a619af0 | 2796 | |
0b31a4bc TT |
2797 | if (nf_baton->needs <= SYMBOL_NEEDS_REGISTERS) |
2798 | nf_baton->needs = SYMBOL_NEEDS_REGISTERS; | |
4c2df51b DJ |
2799 | return 1; |
2800 | } | |
2801 | ||
0b31a4bc TT |
2802 | /* Helper interface of per_cu_dwarf_call for |
2803 | dwarf2_loc_desc_get_symbol_read_needs. */ | |
5c631832 JK |
2804 | |
2805 | static void | |
0b31a4bc | 2806 | symbol_needs_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset) |
5c631832 | 2807 | { |
0b31a4bc TT |
2808 | struct symbol_needs_baton *nf_baton = |
2809 | (struct symbol_needs_baton *) ctx->baton; | |
5c631832 | 2810 | |
37b50a69 | 2811 | per_cu_dwarf_call (ctx, die_offset, nf_baton->per_cu, |
9e8b7a03 | 2812 | ctx->funcs->get_frame_pc, ctx->baton); |
5c631832 JK |
2813 | } |
2814 | ||
8e3b41a9 JK |
2815 | /* DW_OP_GNU_entry_value accesses require a caller, therefore a frame. */ |
2816 | ||
2817 | static void | |
2818 | needs_dwarf_reg_entry_value (struct dwarf_expr_context *ctx, | |
24c5c679 JK |
2819 | enum call_site_parameter_kind kind, |
2820 | union call_site_parameter_u kind_u, int deref_size) | |
8e3b41a9 | 2821 | { |
0b31a4bc TT |
2822 | struct symbol_needs_baton *nf_baton = |
2823 | (struct symbol_needs_baton *) ctx->baton; | |
8e3b41a9 | 2824 | |
0b31a4bc | 2825 | nf_baton->needs = SYMBOL_NEEDS_FRAME; |
1788b2d3 JK |
2826 | |
2827 | /* The expression may require some stub values on DWARF stack. */ | |
2828 | dwarf_expr_push_address (ctx, 0, 0); | |
8e3b41a9 JK |
2829 | } |
2830 | ||
3019eac3 DE |
2831 | /* DW_OP_GNU_addr_index doesn't require a frame. */ |
2832 | ||
2833 | static CORE_ADDR | |
2834 | needs_get_addr_index (void *baton, unsigned int index) | |
2835 | { | |
2836 | /* Nothing to do. */ | |
2837 | return 1; | |
2838 | } | |
2839 | ||
08412b07 JB |
2840 | /* DW_OP_push_object_address has a frame already passed through. */ |
2841 | ||
2842 | static CORE_ADDR | |
2843 | needs_get_obj_addr (void *baton) | |
2844 | { | |
2845 | /* Nothing to do. */ | |
2846 | return 1; | |
2847 | } | |
2848 | ||
0b31a4bc TT |
2849 | /* Virtual method table for dwarf2_loc_desc_get_symbol_read_needs |
2850 | below. */ | |
9e8b7a03 | 2851 | |
0b31a4bc | 2852 | static const struct dwarf_expr_context_funcs symbol_needs_ctx_funcs = |
9e8b7a03 | 2853 | { |
0b31a4bc TT |
2854 | symbol_needs_read_addr_from_reg, |
2855 | symbol_needs_get_reg_value, | |
2856 | symbol_needs_read_mem, | |
2857 | symbol_needs_frame_base, | |
2858 | symbol_needs_frame_cfa, | |
2859 | symbol_needs_frame_cfa, /* get_frame_pc */ | |
2860 | symbol_needs_tls_address, | |
2861 | symbol_needs_dwarf_call, | |
8e3b41a9 | 2862 | NULL, /* get_base_type */ |
3019eac3 | 2863 | needs_dwarf_reg_entry_value, |
08412b07 JB |
2864 | needs_get_addr_index, |
2865 | needs_get_obj_addr | |
9e8b7a03 JK |
2866 | }; |
2867 | ||
0b31a4bc TT |
2868 | /* Compute the correct symbol_needs_kind value for the location |
2869 | expression at DATA (length SIZE). */ | |
4c2df51b | 2870 | |
0b31a4bc TT |
2871 | static enum symbol_needs_kind |
2872 | dwarf2_loc_desc_get_symbol_read_needs (const gdb_byte *data, size_t size, | |
2873 | struct dwarf2_per_cu_data *per_cu) | |
4c2df51b | 2874 | { |
0b31a4bc | 2875 | struct symbol_needs_baton baton; |
4c2df51b | 2876 | struct dwarf_expr_context *ctx; |
f630a401 | 2877 | int in_reg; |
4a227398 | 2878 | struct cleanup *old_chain; |
ac56253d | 2879 | struct objfile *objfile = dwarf2_per_cu_objfile (per_cu); |
4c2df51b | 2880 | |
0b31a4bc | 2881 | baton.needs = SYMBOL_NEEDS_NONE; |
17ea53c3 | 2882 | baton.per_cu = per_cu; |
4c2df51b DJ |
2883 | |
2884 | ctx = new_dwarf_expr_context (); | |
4a227398 | 2885 | old_chain = make_cleanup_free_dwarf_expr_context (ctx); |
72fc29ff | 2886 | make_cleanup_value_free_to_mark (value_mark ()); |
4a227398 | 2887 | |
ac56253d | 2888 | ctx->gdbarch = get_objfile_arch (objfile); |
ae0d2f24 | 2889 | ctx->addr_size = dwarf2_per_cu_addr_size (per_cu); |
181cebd4 | 2890 | ctx->ref_addr_size = dwarf2_per_cu_ref_addr_size (per_cu); |
9aa1f1e3 | 2891 | ctx->offset = dwarf2_per_cu_text_offset (per_cu); |
4c2df51b | 2892 | ctx->baton = &baton; |
0b31a4bc | 2893 | ctx->funcs = &symbol_needs_ctx_funcs; |
4c2df51b DJ |
2894 | |
2895 | dwarf_expr_eval (ctx, data, size); | |
2896 | ||
cec03d70 | 2897 | in_reg = ctx->location == DWARF_VALUE_REGISTER; |
f630a401 | 2898 | |
87808bd6 JB |
2899 | if (ctx->num_pieces > 0) |
2900 | { | |
2901 | int i; | |
2902 | ||
2903 | /* If the location has several pieces, and any of them are in | |
2904 | registers, then we will need a frame to fetch them from. */ | |
2905 | for (i = 0; i < ctx->num_pieces; i++) | |
cec03d70 | 2906 | if (ctx->pieces[i].location == DWARF_VALUE_REGISTER) |
87808bd6 JB |
2907 | in_reg = 1; |
2908 | } | |
2909 | ||
4a227398 | 2910 | do_cleanups (old_chain); |
4c2df51b | 2911 | |
0b31a4bc TT |
2912 | if (in_reg) |
2913 | baton.needs = SYMBOL_NEEDS_FRAME; | |
2914 | return baton.needs; | |
4c2df51b DJ |
2915 | } |
2916 | ||
3cf03773 TT |
2917 | /* A helper function that throws an unimplemented error mentioning a |
2918 | given DWARF operator. */ | |
2919 | ||
2920 | static void | |
2921 | unimplemented (unsigned int op) | |
0d53c4c4 | 2922 | { |
f39c6ffd | 2923 | const char *name = get_DW_OP_name (op); |
b1bfef65 TT |
2924 | |
2925 | if (name) | |
2926 | error (_("DWARF operator %s cannot be translated to an agent expression"), | |
2927 | name); | |
2928 | else | |
1ba1b353 TT |
2929 | error (_("Unknown DWARF operator 0x%02x cannot be translated " |
2930 | "to an agent expression"), | |
b1bfef65 | 2931 | op); |
3cf03773 | 2932 | } |
08922a10 | 2933 | |
0fde2c53 DE |
2934 | /* See dwarf2loc.h. |
2935 | ||
2936 | This is basically a wrapper on gdbarch_dwarf2_reg_to_regnum so that we | |
2937 | can issue a complaint, which is better than having every target's | |
2938 | implementation of dwarf2_reg_to_regnum do it. */ | |
08922a10 | 2939 | |
d064d1be | 2940 | int |
0fde2c53 | 2941 | dwarf_reg_to_regnum (struct gdbarch *arch, int dwarf_reg) |
3cf03773 TT |
2942 | { |
2943 | int reg = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_reg); | |
0fde2c53 | 2944 | |
3cf03773 | 2945 | if (reg == -1) |
0fde2c53 DE |
2946 | { |
2947 | complaint (&symfile_complaints, | |
2948 | _("bad DWARF register number %d"), dwarf_reg); | |
2949 | } | |
2950 | return reg; | |
2951 | } | |
2952 | ||
2953 | /* Subroutine of dwarf_reg_to_regnum_or_error to simplify it. | |
2954 | Throw an error because DWARF_REG is bad. */ | |
2955 | ||
2956 | static void | |
2957 | throw_bad_regnum_error (ULONGEST dwarf_reg) | |
2958 | { | |
2959 | /* Still want to print -1 as "-1". | |
2960 | We *could* have int and ULONGEST versions of dwarf2_reg_to_regnum_or_error | |
2961 | but that's overkill for now. */ | |
2962 | if ((int) dwarf_reg == dwarf_reg) | |
2963 | error (_("Unable to access DWARF register number %d"), (int) dwarf_reg); | |
2964 | error (_("Unable to access DWARF register number %s"), | |
2965 | pulongest (dwarf_reg)); | |
2966 | } | |
2967 | ||
2968 | /* See dwarf2loc.h. */ | |
2969 | ||
2970 | int | |
2971 | dwarf_reg_to_regnum_or_error (struct gdbarch *arch, ULONGEST dwarf_reg) | |
2972 | { | |
2973 | int reg; | |
2974 | ||
2975 | if (dwarf_reg > INT_MAX) | |
2976 | throw_bad_regnum_error (dwarf_reg); | |
2977 | /* Yes, we will end up issuing a complaint and an error if DWARF_REG is | |
2978 | bad, but that's ok. */ | |
2979 | reg = dwarf_reg_to_regnum (arch, (int) dwarf_reg); | |
2980 | if (reg == -1) | |
2981 | throw_bad_regnum_error (dwarf_reg); | |
3cf03773 TT |
2982 | return reg; |
2983 | } | |
08922a10 | 2984 | |
3cf03773 TT |
2985 | /* A helper function that emits an access to memory. ARCH is the |
2986 | target architecture. EXPR is the expression which we are building. | |
2987 | NBITS is the number of bits we want to read. This emits the | |
2988 | opcodes needed to read the memory and then extract the desired | |
2989 | bits. */ | |
08922a10 | 2990 | |
3cf03773 TT |
2991 | static void |
2992 | access_memory (struct gdbarch *arch, struct agent_expr *expr, ULONGEST nbits) | |
08922a10 | 2993 | { |
3cf03773 TT |
2994 | ULONGEST nbytes = (nbits + 7) / 8; |
2995 | ||
9df7235c | 2996 | gdb_assert (nbytes > 0 && nbytes <= sizeof (LONGEST)); |
3cf03773 | 2997 | |
92bc6a20 | 2998 | if (expr->tracing) |
3cf03773 TT |
2999 | ax_trace_quick (expr, nbytes); |
3000 | ||
3001 | if (nbits <= 8) | |
3002 | ax_simple (expr, aop_ref8); | |
3003 | else if (nbits <= 16) | |
3004 | ax_simple (expr, aop_ref16); | |
3005 | else if (nbits <= 32) | |
3006 | ax_simple (expr, aop_ref32); | |
3007 | else | |
3008 | ax_simple (expr, aop_ref64); | |
3009 | ||
3010 | /* If we read exactly the number of bytes we wanted, we're done. */ | |
3011 | if (8 * nbytes == nbits) | |
3012 | return; | |
3013 | ||
3014 | if (gdbarch_bits_big_endian (arch)) | |
0d53c4c4 | 3015 | { |
3cf03773 TT |
3016 | /* On a bits-big-endian machine, we want the high-order |
3017 | NBITS. */ | |
3018 | ax_const_l (expr, 8 * nbytes - nbits); | |
3019 | ax_simple (expr, aop_rsh_unsigned); | |
0d53c4c4 | 3020 | } |
3cf03773 | 3021 | else |
0d53c4c4 | 3022 | { |
3cf03773 TT |
3023 | /* On a bits-little-endian box, we want the low-order NBITS. */ |
3024 | ax_zero_ext (expr, nbits); | |
0d53c4c4 | 3025 | } |
3cf03773 | 3026 | } |
0936ad1d | 3027 | |
8cf6f0b1 TT |
3028 | /* A helper function to return the frame's PC. */ |
3029 | ||
3030 | static CORE_ADDR | |
3031 | get_ax_pc (void *baton) | |
3032 | { | |
9a3c8263 | 3033 | struct agent_expr *expr = (struct agent_expr *) baton; |
8cf6f0b1 TT |
3034 | |
3035 | return expr->scope; | |
3036 | } | |
3037 | ||
3cf03773 TT |
3038 | /* Compile a DWARF location expression to an agent expression. |
3039 | ||
3040 | EXPR is the agent expression we are building. | |
3041 | LOC is the agent value we modify. | |
3042 | ARCH is the architecture. | |
3043 | ADDR_SIZE is the size of addresses, in bytes. | |
3044 | OP_PTR is the start of the location expression. | |
3045 | OP_END is one past the last byte of the location expression. | |
3046 | ||
3047 | This will throw an exception for various kinds of errors -- for | |
3048 | example, if the expression cannot be compiled, or if the expression | |
3049 | is invalid. */ | |
0936ad1d | 3050 | |
9f6f94ff TT |
3051 | void |
3052 | dwarf2_compile_expr_to_ax (struct agent_expr *expr, struct axs_value *loc, | |
3053 | struct gdbarch *arch, unsigned int addr_size, | |
3054 | const gdb_byte *op_ptr, const gdb_byte *op_end, | |
3055 | struct dwarf2_per_cu_data *per_cu) | |
3cf03773 TT |
3056 | { |
3057 | struct cleanup *cleanups; | |
3058 | int i, *offsets; | |
3059 | VEC(int) *dw_labels = NULL, *patches = NULL; | |
3060 | const gdb_byte * const base = op_ptr; | |
3061 | const gdb_byte *previous_piece = op_ptr; | |
3062 | enum bfd_endian byte_order = gdbarch_byte_order (arch); | |
3063 | ULONGEST bits_collected = 0; | |
3064 | unsigned int addr_size_bits = 8 * addr_size; | |
3065 | int bits_big_endian = gdbarch_bits_big_endian (arch); | |
0936ad1d | 3066 | |
8d749320 | 3067 | offsets = XNEWVEC (int, op_end - op_ptr); |
3cf03773 | 3068 | cleanups = make_cleanup (xfree, offsets); |
0936ad1d | 3069 | |
3cf03773 TT |
3070 | for (i = 0; i < op_end - op_ptr; ++i) |
3071 | offsets[i] = -1; | |
0936ad1d | 3072 | |
3cf03773 TT |
3073 | make_cleanup (VEC_cleanup (int), &dw_labels); |
3074 | make_cleanup (VEC_cleanup (int), &patches); | |
0936ad1d | 3075 | |
3cf03773 TT |
3076 | /* By default we are making an address. */ |
3077 | loc->kind = axs_lvalue_memory; | |
0d45f56e | 3078 | |
3cf03773 TT |
3079 | while (op_ptr < op_end) |
3080 | { | |
aead7601 | 3081 | enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr; |
9fccedf7 DE |
3082 | uint64_t uoffset, reg; |
3083 | int64_t offset; | |
3cf03773 TT |
3084 | int i; |
3085 | ||
3086 | offsets[op_ptr - base] = expr->len; | |
3087 | ++op_ptr; | |
3088 | ||
3089 | /* Our basic approach to code generation is to map DWARF | |
3090 | operations directly to AX operations. However, there are | |
3091 | some differences. | |
3092 | ||
3093 | First, DWARF works on address-sized units, but AX always uses | |
3094 | LONGEST. For most operations we simply ignore this | |
3095 | difference; instead we generate sign extensions as needed | |
3096 | before division and comparison operations. It would be nice | |
3097 | to omit the sign extensions, but there is no way to determine | |
3098 | the size of the target's LONGEST. (This code uses the size | |
3099 | of the host LONGEST in some cases -- that is a bug but it is | |
3100 | difficult to fix.) | |
3101 | ||
3102 | Second, some DWARF operations cannot be translated to AX. | |
3103 | For these we simply fail. See | |
3104 | http://sourceware.org/bugzilla/show_bug.cgi?id=11662. */ | |
3105 | switch (op) | |
0936ad1d | 3106 | { |
3cf03773 TT |
3107 | case DW_OP_lit0: |
3108 | case DW_OP_lit1: | |
3109 | case DW_OP_lit2: | |
3110 | case DW_OP_lit3: | |
3111 | case DW_OP_lit4: | |
3112 | case DW_OP_lit5: | |
3113 | case DW_OP_lit6: | |
3114 | case DW_OP_lit7: | |
3115 | case DW_OP_lit8: | |
3116 | case DW_OP_lit9: | |
3117 | case DW_OP_lit10: | |
3118 | case DW_OP_lit11: | |
3119 | case DW_OP_lit12: | |
3120 | case DW_OP_lit13: | |
3121 | case DW_OP_lit14: | |
3122 | case DW_OP_lit15: | |
3123 | case DW_OP_lit16: | |
3124 | case DW_OP_lit17: | |
3125 | case DW_OP_lit18: | |
3126 | case DW_OP_lit19: | |
3127 | case DW_OP_lit20: | |
3128 | case DW_OP_lit21: | |
3129 | case DW_OP_lit22: | |
3130 | case DW_OP_lit23: | |
3131 | case DW_OP_lit24: | |
3132 | case DW_OP_lit25: | |
3133 | case DW_OP_lit26: | |
3134 | case DW_OP_lit27: | |
3135 | case DW_OP_lit28: | |
3136 | case DW_OP_lit29: | |
3137 | case DW_OP_lit30: | |
3138 | case DW_OP_lit31: | |
3139 | ax_const_l (expr, op - DW_OP_lit0); | |
3140 | break; | |
0d53c4c4 | 3141 | |
3cf03773 | 3142 | case DW_OP_addr: |
ac56253d | 3143 | uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order); |
3cf03773 | 3144 | op_ptr += addr_size; |
ac56253d TT |
3145 | /* Some versions of GCC emit DW_OP_addr before |
3146 | DW_OP_GNU_push_tls_address. In this case the value is an | |
3147 | index, not an address. We don't support things like | |
3148 | branching between the address and the TLS op. */ | |
3149 | if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address) | |
9aa1f1e3 | 3150 | uoffset += dwarf2_per_cu_text_offset (per_cu); |
ac56253d | 3151 | ax_const_l (expr, uoffset); |
3cf03773 | 3152 | break; |
4c2df51b | 3153 | |
3cf03773 TT |
3154 | case DW_OP_const1u: |
3155 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 1, byte_order)); | |
3156 | op_ptr += 1; | |
3157 | break; | |
3158 | case DW_OP_const1s: | |
3159 | ax_const_l (expr, extract_signed_integer (op_ptr, 1, byte_order)); | |
3160 | op_ptr += 1; | |
3161 | break; | |
3162 | case DW_OP_const2u: | |
3163 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 2, byte_order)); | |
3164 | op_ptr += 2; | |
3165 | break; | |
3166 | case DW_OP_const2s: | |
3167 | ax_const_l (expr, extract_signed_integer (op_ptr, 2, byte_order)); | |
3168 | op_ptr += 2; | |
3169 | break; | |
3170 | case DW_OP_const4u: | |
3171 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 4, byte_order)); | |
3172 | op_ptr += 4; | |
3173 | break; | |
3174 | case DW_OP_const4s: | |
3175 | ax_const_l (expr, extract_signed_integer (op_ptr, 4, byte_order)); | |
3176 | op_ptr += 4; | |
3177 | break; | |
3178 | case DW_OP_const8u: | |
3179 | ax_const_l (expr, extract_unsigned_integer (op_ptr, 8, byte_order)); | |
3180 | op_ptr += 8; | |
3181 | break; | |
3182 | case DW_OP_const8s: | |
3183 | ax_const_l (expr, extract_signed_integer (op_ptr, 8, byte_order)); | |
3184 | op_ptr += 8; | |
3185 | break; | |
3186 | case DW_OP_constu: | |
f664829e | 3187 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset); |
3cf03773 TT |
3188 | ax_const_l (expr, uoffset); |
3189 | break; | |
3190 | case DW_OP_consts: | |
f664829e | 3191 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
3cf03773 TT |
3192 | ax_const_l (expr, offset); |
3193 | break; | |
9c238357 | 3194 | |
3cf03773 TT |
3195 | case DW_OP_reg0: |
3196 | case DW_OP_reg1: | |
3197 | case DW_OP_reg2: | |
3198 | case DW_OP_reg3: | |
3199 | case DW_OP_reg4: | |
3200 | case DW_OP_reg5: | |
3201 | case DW_OP_reg6: | |
3202 | case DW_OP_reg7: | |
3203 | case DW_OP_reg8: | |
3204 | case DW_OP_reg9: | |
3205 | case DW_OP_reg10: | |
3206 | case DW_OP_reg11: | |
3207 | case DW_OP_reg12: | |
3208 | case DW_OP_reg13: | |
3209 | case DW_OP_reg14: | |
3210 | case DW_OP_reg15: | |
3211 | case DW_OP_reg16: | |
3212 | case DW_OP_reg17: | |
3213 | case DW_OP_reg18: | |
3214 | case DW_OP_reg19: | |
3215 | case DW_OP_reg20: | |
3216 | case DW_OP_reg21: | |
3217 | case DW_OP_reg22: | |
3218 | case DW_OP_reg23: | |
3219 | case DW_OP_reg24: | |
3220 | case DW_OP_reg25: | |
3221 | case DW_OP_reg26: | |
3222 | case DW_OP_reg27: | |
3223 | case DW_OP_reg28: | |
3224 | case DW_OP_reg29: | |
3225 | case DW_OP_reg30: | |
3226 | case DW_OP_reg31: | |
3227 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); | |
0fde2c53 | 3228 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_reg0); |
3cf03773 TT |
3229 | loc->kind = axs_lvalue_register; |
3230 | break; | |
9c238357 | 3231 | |
3cf03773 | 3232 | case DW_OP_regx: |
f664829e | 3233 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 | 3234 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx"); |
0fde2c53 | 3235 | loc->u.reg = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3236 | loc->kind = axs_lvalue_register; |
3237 | break; | |
08922a10 | 3238 | |
3cf03773 TT |
3239 | case DW_OP_implicit_value: |
3240 | { | |
9fccedf7 | 3241 | uint64_t len; |
3cf03773 | 3242 | |
f664829e | 3243 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &len); |
3cf03773 TT |
3244 | if (op_ptr + len > op_end) |
3245 | error (_("DW_OP_implicit_value: too few bytes available.")); | |
3246 | if (len > sizeof (ULONGEST)) | |
3247 | error (_("Cannot translate DW_OP_implicit_value of %d bytes"), | |
3248 | (int) len); | |
3249 | ||
3250 | ax_const_l (expr, extract_unsigned_integer (op_ptr, len, | |
3251 | byte_order)); | |
3252 | op_ptr += len; | |
3253 | dwarf_expr_require_composition (op_ptr, op_end, | |
3254 | "DW_OP_implicit_value"); | |
3255 | ||
3256 | loc->kind = axs_rvalue; | |
3257 | } | |
3258 | break; | |
08922a10 | 3259 | |
3cf03773 TT |
3260 | case DW_OP_stack_value: |
3261 | dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value"); | |
3262 | loc->kind = axs_rvalue; | |
3263 | break; | |
08922a10 | 3264 | |
3cf03773 TT |
3265 | case DW_OP_breg0: |
3266 | case DW_OP_breg1: | |
3267 | case DW_OP_breg2: | |
3268 | case DW_OP_breg3: | |
3269 | case DW_OP_breg4: | |
3270 | case DW_OP_breg5: | |
3271 | case DW_OP_breg6: | |
3272 | case DW_OP_breg7: | |
3273 | case DW_OP_breg8: | |
3274 | case DW_OP_breg9: | |
3275 | case DW_OP_breg10: | |
3276 | case DW_OP_breg11: | |
3277 | case DW_OP_breg12: | |
3278 | case DW_OP_breg13: | |
3279 | case DW_OP_breg14: | |
3280 | case DW_OP_breg15: | |
3281 | case DW_OP_breg16: | |
3282 | case DW_OP_breg17: | |
3283 | case DW_OP_breg18: | |
3284 | case DW_OP_breg19: | |
3285 | case DW_OP_breg20: | |
3286 | case DW_OP_breg21: | |
3287 | case DW_OP_breg22: | |
3288 | case DW_OP_breg23: | |
3289 | case DW_OP_breg24: | |
3290 | case DW_OP_breg25: | |
3291 | case DW_OP_breg26: | |
3292 | case DW_OP_breg27: | |
3293 | case DW_OP_breg28: | |
3294 | case DW_OP_breg29: | |
3295 | case DW_OP_breg30: | |
3296 | case DW_OP_breg31: | |
f664829e | 3297 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
0fde2c53 | 3298 | i = dwarf_reg_to_regnum_or_error (arch, op - DW_OP_breg0); |
3cf03773 TT |
3299 | ax_reg (expr, i); |
3300 | if (offset != 0) | |
3301 | { | |
3302 | ax_const_l (expr, offset); | |
3303 | ax_simple (expr, aop_add); | |
3304 | } | |
3305 | break; | |
3306 | case DW_OP_bregx: | |
3307 | { | |
f664829e DE |
3308 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3309 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); | |
0fde2c53 | 3310 | i = dwarf_reg_to_regnum_or_error (arch, reg); |
3cf03773 TT |
3311 | ax_reg (expr, i); |
3312 | if (offset != 0) | |
3313 | { | |
3314 | ax_const_l (expr, offset); | |
3315 | ax_simple (expr, aop_add); | |
3316 | } | |
3317 | } | |
3318 | break; | |
3319 | case DW_OP_fbreg: | |
3320 | { | |
3321 | const gdb_byte *datastart; | |
3322 | size_t datalen; | |
3977b71f | 3323 | const struct block *b; |
3cf03773 | 3324 | struct symbol *framefunc; |
08922a10 | 3325 | |
3cf03773 TT |
3326 | b = block_for_pc (expr->scope); |
3327 | ||
3328 | if (!b) | |
3329 | error (_("No block found for address")); | |
3330 | ||
3331 | framefunc = block_linkage_function (b); | |
3332 | ||
3333 | if (!framefunc) | |
3334 | error (_("No function found for block")); | |
3335 | ||
af945b75 TT |
3336 | func_get_frame_base_dwarf_block (framefunc, expr->scope, |
3337 | &datastart, &datalen); | |
3cf03773 | 3338 | |
f664829e | 3339 | op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset); |
9f6f94ff TT |
3340 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, datastart, |
3341 | datastart + datalen, per_cu); | |
d84cf7eb TT |
3342 | if (loc->kind == axs_lvalue_register) |
3343 | require_rvalue (expr, loc); | |
3cf03773 TT |
3344 | |
3345 | if (offset != 0) | |
3346 | { | |
3347 | ax_const_l (expr, offset); | |
3348 | ax_simple (expr, aop_add); | |
3349 | } | |
3350 | ||
3351 | loc->kind = axs_lvalue_memory; | |
3352 | } | |
08922a10 | 3353 | break; |
08922a10 | 3354 | |
3cf03773 TT |
3355 | case DW_OP_dup: |
3356 | ax_simple (expr, aop_dup); | |
3357 | break; | |
08922a10 | 3358 | |
3cf03773 TT |
3359 | case DW_OP_drop: |
3360 | ax_simple (expr, aop_pop); | |
3361 | break; | |
08922a10 | 3362 | |
3cf03773 TT |
3363 | case DW_OP_pick: |
3364 | offset = *op_ptr++; | |
c7f96d2b | 3365 | ax_pick (expr, offset); |
3cf03773 TT |
3366 | break; |
3367 | ||
3368 | case DW_OP_swap: | |
3369 | ax_simple (expr, aop_swap); | |
3370 | break; | |
08922a10 | 3371 | |
3cf03773 | 3372 | case DW_OP_over: |
c7f96d2b | 3373 | ax_pick (expr, 1); |
3cf03773 | 3374 | break; |
08922a10 | 3375 | |
3cf03773 | 3376 | case DW_OP_rot: |
c7f96d2b | 3377 | ax_simple (expr, aop_rot); |
3cf03773 | 3378 | break; |
08922a10 | 3379 | |
3cf03773 TT |
3380 | case DW_OP_deref: |
3381 | case DW_OP_deref_size: | |
3382 | { | |
3383 | int size; | |
08922a10 | 3384 | |
3cf03773 TT |
3385 | if (op == DW_OP_deref_size) |
3386 | size = *op_ptr++; | |
3387 | else | |
3388 | size = addr_size; | |
3389 | ||
9df7235c | 3390 | if (size != 1 && size != 2 && size != 4 && size != 8) |
f3cec7e6 HZ |
3391 | error (_("Unsupported size %d in %s"), |
3392 | size, get_DW_OP_name (op)); | |
9df7235c | 3393 | access_memory (arch, expr, size * TARGET_CHAR_BIT); |
3cf03773 TT |
3394 | } |
3395 | break; | |
3396 | ||
3397 | case DW_OP_abs: | |
3398 | /* Sign extend the operand. */ | |
3399 | ax_ext (expr, addr_size_bits); | |
3400 | ax_simple (expr, aop_dup); | |
3401 | ax_const_l (expr, 0); | |
3402 | ax_simple (expr, aop_less_signed); | |
3403 | ax_simple (expr, aop_log_not); | |
3404 | i = ax_goto (expr, aop_if_goto); | |
3405 | /* We have to emit 0 - X. */ | |
3406 | ax_const_l (expr, 0); | |
3407 | ax_simple (expr, aop_swap); | |
3408 | ax_simple (expr, aop_sub); | |
3409 | ax_label (expr, i, expr->len); | |
3410 | break; | |
3411 | ||
3412 | case DW_OP_neg: | |
3413 | /* No need to sign extend here. */ | |
3414 | ax_const_l (expr, 0); | |
3415 | ax_simple (expr, aop_swap); | |
3416 | ax_simple (expr, aop_sub); | |
3417 | break; | |
3418 | ||
3419 | case DW_OP_not: | |
3420 | /* Sign extend the operand. */ | |
3421 | ax_ext (expr, addr_size_bits); | |
3422 | ax_simple (expr, aop_bit_not); | |
3423 | break; | |
3424 | ||
3425 | case DW_OP_plus_uconst: | |
f664829e | 3426 | op_ptr = safe_read_uleb128 (op_ptr, op_end, ®); |
3cf03773 TT |
3427 | /* It would be really weird to emit `DW_OP_plus_uconst 0', |
3428 | but we micro-optimize anyhow. */ | |
3429 | if (reg != 0) | |
3430 | { | |
3431 | ax_const_l (expr, reg); | |
3432 | ax_simple (expr, aop_add); | |
3433 | } | |
3434 | break; | |
3435 | ||
3436 | case DW_OP_and: | |
3437 | ax_simple (expr, aop_bit_and); | |
3438 | break; | |
3439 | ||
3440 | case DW_OP_div: | |
3441 | /* Sign extend the operands. */ | |
3442 | ax_ext (expr, addr_size_bits); | |
3443 | ax_simple (expr, aop_swap); | |
3444 | ax_ext (expr, addr_size_bits); | |
3445 | ax_simple (expr, aop_swap); | |
3446 | ax_simple (expr, aop_div_signed); | |
08922a10 SS |
3447 | break; |
3448 | ||
3cf03773 TT |
3449 | case DW_OP_minus: |
3450 | ax_simple (expr, aop_sub); | |
3451 | break; | |
3452 | ||
3453 | case DW_OP_mod: | |
3454 | ax_simple (expr, aop_rem_unsigned); | |
3455 | break; | |
3456 | ||
3457 | case DW_OP_mul: | |
3458 | ax_simple (expr, aop_mul); | |
3459 | break; | |
3460 | ||
3461 | case DW_OP_or: | |
3462 | ax_simple (expr, aop_bit_or); | |
3463 | break; | |
3464 | ||
3465 | case DW_OP_plus: | |
3466 | ax_simple (expr, aop_add); | |
3467 | break; | |
3468 | ||
3469 | case DW_OP_shl: | |
3470 | ax_simple (expr, aop_lsh); | |
3471 | break; | |
3472 | ||
3473 | case DW_OP_shr: | |
3474 | ax_simple (expr, aop_rsh_unsigned); | |
3475 | break; | |
3476 | ||
3477 | case DW_OP_shra: | |
3478 | ax_simple (expr, aop_rsh_signed); | |
3479 | break; | |
3480 | ||
3481 | case DW_OP_xor: | |
3482 | ax_simple (expr, aop_bit_xor); | |
3483 | break; | |
3484 | ||
3485 | case DW_OP_le: | |
3486 | /* Sign extend the operands. */ | |
3487 | ax_ext (expr, addr_size_bits); | |
3488 | ax_simple (expr, aop_swap); | |
3489 | ax_ext (expr, addr_size_bits); | |
3490 | /* Note no swap here: A <= B is !(B < A). */ | |
3491 | ax_simple (expr, aop_less_signed); | |
3492 | ax_simple (expr, aop_log_not); | |
3493 | break; | |
3494 | ||
3495 | case DW_OP_ge: | |
3496 | /* Sign extend the operands. */ | |
3497 | ax_ext (expr, addr_size_bits); | |
3498 | ax_simple (expr, aop_swap); | |
3499 | ax_ext (expr, addr_size_bits); | |
3500 | ax_simple (expr, aop_swap); | |
3501 | /* A >= B is !(A < B). */ | |
3502 | ax_simple (expr, aop_less_signed); | |
3503 | ax_simple (expr, aop_log_not); | |
3504 | break; | |
3505 | ||
3506 | case DW_OP_eq: | |
3507 | /* Sign extend the operands. */ | |
3508 | ax_ext (expr, addr_size_bits); | |
3509 | ax_simple (expr, aop_swap); | |
3510 | ax_ext (expr, addr_size_bits); | |
3511 | /* No need for a second swap here. */ | |
3512 | ax_simple (expr, aop_equal); | |
3513 | break; | |
3514 | ||
3515 | case DW_OP_lt: | |
3516 | /* Sign extend the operands. */ | |
3517 | ax_ext (expr, addr_size_bits); | |
3518 | ax_simple (expr, aop_swap); | |
3519 | ax_ext (expr, addr_size_bits); | |
3520 | ax_simple (expr, aop_swap); | |
3521 | ax_simple (expr, aop_less_signed); | |
3522 | break; | |
3523 | ||
3524 | case DW_OP_gt: | |
3525 | /* Sign extend the operands. */ | |
3526 | ax_ext (expr, addr_size_bits); | |
3527 | ax_simple (expr, aop_swap); | |
3528 | ax_ext (expr, addr_size_bits); | |
3529 | /* Note no swap here: A > B is B < A. */ | |
3530 | ax_simple (expr, aop_less_signed); | |
3531 | break; | |
3532 | ||
3533 | case DW_OP_ne: | |
3534 | /* Sign extend the operands. */ | |
3535 | ax_ext (expr, addr_size_bits); | |
3536 | ax_simple (expr, aop_swap); | |
3537 | ax_ext (expr, addr_size_bits); | |
3538 | /* No need for a swap here. */ | |
3539 | ax_simple (expr, aop_equal); | |
3540 | ax_simple (expr, aop_log_not); | |
3541 | break; | |
3542 | ||
3543 | case DW_OP_call_frame_cfa: | |
a8fd5589 TT |
3544 | { |
3545 | int regnum; | |
3546 | CORE_ADDR text_offset; | |
3547 | LONGEST off; | |
3548 | const gdb_byte *cfa_start, *cfa_end; | |
3549 | ||
3550 | if (dwarf2_fetch_cfa_info (arch, expr->scope, per_cu, | |
3551 | ®num, &off, | |
3552 | &text_offset, &cfa_start, &cfa_end)) | |
3553 | { | |
3554 | /* Register. */ | |
3555 | ax_reg (expr, regnum); | |
3556 | if (off != 0) | |
3557 | { | |
3558 | ax_const_l (expr, off); | |
3559 | ax_simple (expr, aop_add); | |
3560 | } | |
3561 | } | |
3562 | else | |
3563 | { | |
3564 | /* Another expression. */ | |
3565 | ax_const_l (expr, text_offset); | |
3566 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, | |
3567 | cfa_start, cfa_end, per_cu); | |
3568 | } | |
3569 | ||
3570 | loc->kind = axs_lvalue_memory; | |
3571 | } | |
3cf03773 TT |
3572 | break; |
3573 | ||
3574 | case DW_OP_GNU_push_tls_address: | |
4aa4e28b | 3575 | case DW_OP_form_tls_address: |
3cf03773 TT |
3576 | unimplemented (op); |
3577 | break; | |
3578 | ||
08412b07 JB |
3579 | case DW_OP_push_object_address: |
3580 | unimplemented (op); | |
3581 | break; | |
3582 | ||
3cf03773 TT |
3583 | case DW_OP_skip: |
3584 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3585 | op_ptr += 2; | |
3586 | i = ax_goto (expr, aop_goto); | |
3587 | VEC_safe_push (int, dw_labels, op_ptr + offset - base); | |
3588 | VEC_safe_push (int, patches, i); | |
3589 | break; | |
3590 | ||
3591 | case DW_OP_bra: | |
3592 | offset = extract_signed_integer (op_ptr, 2, byte_order); | |
3593 | op_ptr += 2; | |
3594 | /* Zero extend the operand. */ | |
3595 | ax_zero_ext (expr, addr_size_bits); | |
3596 | i = ax_goto (expr, aop_if_goto); | |
3597 | VEC_safe_push (int, dw_labels, op_ptr + offset - base); | |
3598 | VEC_safe_push (int, patches, i); | |
3599 | break; | |
3600 | ||
3601 | case DW_OP_nop: | |
3602 | break; | |
3603 | ||
3604 | case DW_OP_piece: | |
3605 | case DW_OP_bit_piece: | |
08922a10 | 3606 | { |
9fccedf7 | 3607 | uint64_t size, offset; |
3cf03773 TT |
3608 | |
3609 | if (op_ptr - 1 == previous_piece) | |
3610 | error (_("Cannot translate empty pieces to agent expressions")); | |
3611 | previous_piece = op_ptr - 1; | |
3612 | ||
f664829e | 3613 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &size); |
3cf03773 TT |
3614 | if (op == DW_OP_piece) |
3615 | { | |
3616 | size *= 8; | |
3617 | offset = 0; | |
3618 | } | |
3619 | else | |
f664829e | 3620 | op_ptr = safe_read_uleb128 (op_ptr, op_end, &offset); |
08922a10 | 3621 | |
3cf03773 TT |
3622 | if (bits_collected + size > 8 * sizeof (LONGEST)) |
3623 | error (_("Expression pieces exceed word size")); | |
3624 | ||
3625 | /* Access the bits. */ | |
3626 | switch (loc->kind) | |
3627 | { | |
3628 | case axs_lvalue_register: | |
3629 | ax_reg (expr, loc->u.reg); | |
3630 | break; | |
3631 | ||
3632 | case axs_lvalue_memory: | |
3633 | /* Offset the pointer, if needed. */ | |
3634 | if (offset > 8) | |
3635 | { | |
3636 | ax_const_l (expr, offset / 8); | |
3637 | ax_simple (expr, aop_add); | |
3638 | offset %= 8; | |
3639 | } | |
3640 | access_memory (arch, expr, size); | |
3641 | break; | |
3642 | } | |
3643 | ||
3644 | /* For a bits-big-endian target, shift up what we already | |
3645 | have. For a bits-little-endian target, shift up the | |
3646 | new data. Note that there is a potential bug here if | |
3647 | the DWARF expression leaves multiple values on the | |
3648 | stack. */ | |
3649 | if (bits_collected > 0) | |
3650 | { | |
3651 | if (bits_big_endian) | |
3652 | { | |
3653 | ax_simple (expr, aop_swap); | |
3654 | ax_const_l (expr, size); | |
3655 | ax_simple (expr, aop_lsh); | |
3656 | /* We don't need a second swap here, because | |
3657 | aop_bit_or is symmetric. */ | |
3658 | } | |
3659 | else | |
3660 | { | |
3661 | ax_const_l (expr, size); | |
3662 | ax_simple (expr, aop_lsh); | |
3663 | } | |
3664 | ax_simple (expr, aop_bit_or); | |
3665 | } | |
3666 | ||
3667 | bits_collected += size; | |
3668 | loc->kind = axs_rvalue; | |
08922a10 SS |
3669 | } |
3670 | break; | |
08922a10 | 3671 | |
3cf03773 TT |
3672 | case DW_OP_GNU_uninit: |
3673 | unimplemented (op); | |
3674 | ||
3675 | case DW_OP_call2: | |
3676 | case DW_OP_call4: | |
3677 | { | |
3678 | struct dwarf2_locexpr_baton block; | |
3679 | int size = (op == DW_OP_call2 ? 2 : 4); | |
b64f50a1 | 3680 | cu_offset offset; |
3cf03773 TT |
3681 | |
3682 | uoffset = extract_unsigned_integer (op_ptr, size, byte_order); | |
3683 | op_ptr += size; | |
3684 | ||
b64f50a1 | 3685 | offset.cu_off = uoffset; |
8b9737bf TT |
3686 | block = dwarf2_fetch_die_loc_cu_off (offset, per_cu, |
3687 | get_ax_pc, expr); | |
3cf03773 TT |
3688 | |
3689 | /* DW_OP_call_ref is currently not supported. */ | |
3690 | gdb_assert (block.per_cu == per_cu); | |
3691 | ||
9f6f94ff TT |
3692 | dwarf2_compile_expr_to_ax (expr, loc, arch, addr_size, |
3693 | block.data, block.data + block.size, | |
3694 | per_cu); | |
3cf03773 TT |
3695 | } |
3696 | break; | |
3697 | ||
3698 | case DW_OP_call_ref: | |
3699 | unimplemented (op); | |
3700 | ||
3701 | default: | |
b1bfef65 | 3702 | unimplemented (op); |
08922a10 | 3703 | } |
08922a10 | 3704 | } |
3cf03773 TT |
3705 | |
3706 | /* Patch all the branches we emitted. */ | |
3707 | for (i = 0; i < VEC_length (int, patches); ++i) | |
3708 | { | |
3709 | int targ = offsets[VEC_index (int, dw_labels, i)]; | |
3710 | if (targ == -1) | |
3711 | internal_error (__FILE__, __LINE__, _("invalid label")); | |
3712 | ax_label (expr, VEC_index (int, patches, i), targ); | |
3713 | } | |
3714 | ||
3715 | do_cleanups (cleanups); | |
08922a10 SS |
3716 | } |
3717 | ||
4c2df51b DJ |
3718 | \f |
3719 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
3720 | evaluator to calculate the location. */ | |
3721 | static struct value * | |
3722 | locexpr_read_variable (struct symbol *symbol, struct frame_info *frame) | |
3723 | { | |
9a3c8263 SM |
3724 | struct dwarf2_locexpr_baton *dlbaton |
3725 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
4c2df51b | 3726 | struct value *val; |
9a619af0 | 3727 | |
a2d33775 JK |
3728 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data, |
3729 | dlbaton->size, dlbaton->per_cu); | |
4c2df51b DJ |
3730 | |
3731 | return val; | |
3732 | } | |
3733 | ||
e18b2753 JK |
3734 | /* Return the value of SYMBOL in FRAME at (callee) FRAME's function |
3735 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
3736 | will be thrown. */ | |
3737 | ||
3738 | static struct value * | |
3739 | locexpr_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
3740 | { | |
9a3c8263 SM |
3741 | struct dwarf2_locexpr_baton *dlbaton |
3742 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
3743 | |
3744 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, dlbaton->data, | |
3745 | dlbaton->size); | |
3746 | } | |
3747 | ||
0b31a4bc TT |
3748 | /* Implementation of get_symbol_read_needs from |
3749 | symbol_computed_ops. */ | |
3750 | ||
3751 | static enum symbol_needs_kind | |
3752 | locexpr_get_symbol_read_needs (struct symbol *symbol) | |
4c2df51b | 3753 | { |
9a3c8263 SM |
3754 | struct dwarf2_locexpr_baton *dlbaton |
3755 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
9a619af0 | 3756 | |
0b31a4bc TT |
3757 | return dwarf2_loc_desc_get_symbol_read_needs (dlbaton->data, dlbaton->size, |
3758 | dlbaton->per_cu); | |
4c2df51b DJ |
3759 | } |
3760 | ||
9eae7c52 TT |
3761 | /* Return true if DATA points to the end of a piece. END is one past |
3762 | the last byte in the expression. */ | |
3763 | ||
3764 | static int | |
3765 | piece_end_p (const gdb_byte *data, const gdb_byte *end) | |
3766 | { | |
3767 | return data == end || data[0] == DW_OP_piece || data[0] == DW_OP_bit_piece; | |
3768 | } | |
3769 | ||
5e44ecb3 TT |
3770 | /* Helper for locexpr_describe_location_piece that finds the name of a |
3771 | DWARF register. */ | |
3772 | ||
3773 | static const char * | |
3774 | locexpr_regname (struct gdbarch *gdbarch, int dwarf_regnum) | |
3775 | { | |
3776 | int regnum; | |
3777 | ||
0fde2c53 DE |
3778 | /* This doesn't use dwarf_reg_to_regnum_or_error on purpose. |
3779 | We'd rather print *something* here than throw an error. */ | |
3780 | regnum = dwarf_reg_to_regnum (gdbarch, dwarf_regnum); | |
3781 | /* gdbarch_register_name may just return "", return something more | |
3782 | descriptive for bad register numbers. */ | |
3783 | if (regnum == -1) | |
3784 | { | |
3785 | /* The text is output as "$bad_register_number". | |
3786 | That is why we use the underscores. */ | |
3787 | return _("bad_register_number"); | |
3788 | } | |
5e44ecb3 TT |
3789 | return gdbarch_register_name (gdbarch, regnum); |
3790 | } | |
3791 | ||
9eae7c52 TT |
3792 | /* Nicely describe a single piece of a location, returning an updated |
3793 | position in the bytecode sequence. This function cannot recognize | |
3794 | all locations; if a location is not recognized, it simply returns | |
f664829e DE |
3795 | DATA. If there is an error during reading, e.g. we run off the end |
3796 | of the buffer, an error is thrown. */ | |
08922a10 | 3797 | |
0d45f56e | 3798 | static const gdb_byte * |
08922a10 SS |
3799 | locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream, |
3800 | CORE_ADDR addr, struct objfile *objfile, | |
49f6c839 | 3801 | struct dwarf2_per_cu_data *per_cu, |
9eae7c52 | 3802 | const gdb_byte *data, const gdb_byte *end, |
0d45f56e | 3803 | unsigned int addr_size) |
4c2df51b | 3804 | { |
08922a10 | 3805 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
49f6c839 | 3806 | size_t leb128_size; |
08922a10 SS |
3807 | |
3808 | if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31) | |
3809 | { | |
08922a10 | 3810 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3811 | locexpr_regname (gdbarch, data[0] - DW_OP_reg0)); |
08922a10 SS |
3812 | data += 1; |
3813 | } | |
3814 | else if (data[0] == DW_OP_regx) | |
3815 | { | |
9fccedf7 | 3816 | uint64_t reg; |
4c2df51b | 3817 | |
f664829e | 3818 | data = safe_read_uleb128 (data + 1, end, ®); |
08922a10 | 3819 | fprintf_filtered (stream, _("a variable in $%s"), |
5e44ecb3 | 3820 | locexpr_regname (gdbarch, reg)); |
08922a10 SS |
3821 | } |
3822 | else if (data[0] == DW_OP_fbreg) | |
4c2df51b | 3823 | { |
3977b71f | 3824 | const struct block *b; |
08922a10 SS |
3825 | struct symbol *framefunc; |
3826 | int frame_reg = 0; | |
9fccedf7 | 3827 | int64_t frame_offset; |
7155d578 | 3828 | const gdb_byte *base_data, *new_data, *save_data = data; |
08922a10 | 3829 | size_t base_size; |
9fccedf7 | 3830 | int64_t base_offset = 0; |
08922a10 | 3831 | |
f664829e | 3832 | new_data = safe_read_sleb128 (data + 1, end, &frame_offset); |
9eae7c52 TT |
3833 | if (!piece_end_p (new_data, end)) |
3834 | return data; | |
3835 | data = new_data; | |
3836 | ||
08922a10 SS |
3837 | b = block_for_pc (addr); |
3838 | ||
3839 | if (!b) | |
3840 | error (_("No block found for address for symbol \"%s\"."), | |
3841 | SYMBOL_PRINT_NAME (symbol)); | |
3842 | ||
3843 | framefunc = block_linkage_function (b); | |
3844 | ||
3845 | if (!framefunc) | |
3846 | error (_("No function found for block for symbol \"%s\"."), | |
3847 | SYMBOL_PRINT_NAME (symbol)); | |
3848 | ||
af945b75 | 3849 | func_get_frame_base_dwarf_block (framefunc, addr, &base_data, &base_size); |
08922a10 SS |
3850 | |
3851 | if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31) | |
3852 | { | |
0d45f56e | 3853 | const gdb_byte *buf_end; |
08922a10 SS |
3854 | |
3855 | frame_reg = base_data[0] - DW_OP_breg0; | |
f664829e DE |
3856 | buf_end = safe_read_sleb128 (base_data + 1, base_data + base_size, |
3857 | &base_offset); | |
08922a10 | 3858 | if (buf_end != base_data + base_size) |
3e43a32a MS |
3859 | error (_("Unexpected opcode after " |
3860 | "DW_OP_breg%u for symbol \"%s\"."), | |
08922a10 SS |
3861 | frame_reg, SYMBOL_PRINT_NAME (symbol)); |
3862 | } | |
3863 | else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31) | |
3864 | { | |
3865 | /* The frame base is just the register, with no offset. */ | |
3866 | frame_reg = base_data[0] - DW_OP_reg0; | |
3867 | base_offset = 0; | |
3868 | } | |
3869 | else | |
3870 | { | |
3871 | /* We don't know what to do with the frame base expression, | |
3872 | so we can't trace this variable; give up. */ | |
7155d578 | 3873 | return save_data; |
08922a10 SS |
3874 | } |
3875 | ||
3e43a32a MS |
3876 | fprintf_filtered (stream, |
3877 | _("a variable at frame base reg $%s offset %s+%s"), | |
5e44ecb3 | 3878 | locexpr_regname (gdbarch, frame_reg), |
08922a10 SS |
3879 | plongest (base_offset), plongest (frame_offset)); |
3880 | } | |
9eae7c52 TT |
3881 | else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31 |
3882 | && piece_end_p (data, end)) | |
08922a10 | 3883 | { |
9fccedf7 | 3884 | int64_t offset; |
08922a10 | 3885 | |
f664829e | 3886 | data = safe_read_sleb128 (data + 1, end, &offset); |
08922a10 | 3887 | |
4c2df51b | 3888 | fprintf_filtered (stream, |
08922a10 SS |
3889 | _("a variable at offset %s from base reg $%s"), |
3890 | plongest (offset), | |
5e44ecb3 | 3891 | locexpr_regname (gdbarch, data[0] - DW_OP_breg0)); |
4c2df51b DJ |
3892 | } |
3893 | ||
c3228f12 EZ |
3894 | /* The location expression for a TLS variable looks like this (on a |
3895 | 64-bit LE machine): | |
3896 | ||
3897 | DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0 | |
3898 | (DW_OP_addr: 4; DW_OP_GNU_push_tls_address) | |
09d8bd00 | 3899 | |
c3228f12 EZ |
3900 | 0x3 is the encoding for DW_OP_addr, which has an operand as long |
3901 | as the size of an address on the target machine (here is 8 | |
09d8bd00 TT |
3902 | bytes). Note that more recent version of GCC emit DW_OP_const4u |
3903 | or DW_OP_const8u, depending on address size, rather than | |
0963b4bd MS |
3904 | DW_OP_addr. 0xe0 is the encoding for DW_OP_GNU_push_tls_address. |
3905 | The operand represents the offset at which the variable is within | |
3906 | the thread local storage. */ | |
c3228f12 | 3907 | |
9eae7c52 | 3908 | else if (data + 1 + addr_size < end |
09d8bd00 TT |
3909 | && (data[0] == DW_OP_addr |
3910 | || (addr_size == 4 && data[0] == DW_OP_const4u) | |
3911 | || (addr_size == 8 && data[0] == DW_OP_const8u)) | |
4aa4e28b TT |
3912 | && (data[1 + addr_size] == DW_OP_GNU_push_tls_address |
3913 | || data[1 + addr_size] == DW_OP_form_tls_address) | |
9eae7c52 | 3914 | && piece_end_p (data + 2 + addr_size, end)) |
08922a10 | 3915 | { |
d4a087c7 UW |
3916 | ULONGEST offset; |
3917 | offset = extract_unsigned_integer (data + 1, addr_size, | |
3918 | gdbarch_byte_order (gdbarch)); | |
9a619af0 | 3919 | |
08922a10 | 3920 | fprintf_filtered (stream, |
d4a087c7 | 3921 | _("a thread-local variable at offset 0x%s " |
08922a10 | 3922 | "in the thread-local storage for `%s'"), |
4262abfb | 3923 | phex_nz (offset, addr_size), objfile_name (objfile)); |
08922a10 SS |
3924 | |
3925 | data += 1 + addr_size + 1; | |
3926 | } | |
49f6c839 DE |
3927 | |
3928 | /* With -gsplit-dwarf a TLS variable can also look like this: | |
3929 | DW_AT_location : 3 byte block: fc 4 e0 | |
3930 | (DW_OP_GNU_const_index: 4; | |
3931 | DW_OP_GNU_push_tls_address) */ | |
3932 | else if (data + 3 <= end | |
3933 | && data + 1 + (leb128_size = skip_leb128 (data + 1, end)) < end | |
3934 | && data[0] == DW_OP_GNU_const_index | |
3935 | && leb128_size > 0 | |
4aa4e28b TT |
3936 | && (data[1 + leb128_size] == DW_OP_GNU_push_tls_address |
3937 | || data[1 + leb128_size] == DW_OP_form_tls_address) | |
49f6c839 DE |
3938 | && piece_end_p (data + 2 + leb128_size, end)) |
3939 | { | |
a55c1f32 | 3940 | uint64_t offset; |
49f6c839 DE |
3941 | |
3942 | data = safe_read_uleb128 (data + 1, end, &offset); | |
3943 | offset = dwarf2_read_addr_index (per_cu, offset); | |
3944 | fprintf_filtered (stream, | |
3945 | _("a thread-local variable at offset 0x%s " | |
3946 | "in the thread-local storage for `%s'"), | |
4262abfb | 3947 | phex_nz (offset, addr_size), objfile_name (objfile)); |
49f6c839 DE |
3948 | ++data; |
3949 | } | |
3950 | ||
9eae7c52 TT |
3951 | else if (data[0] >= DW_OP_lit0 |
3952 | && data[0] <= DW_OP_lit31 | |
3953 | && data + 1 < end | |
3954 | && data[1] == DW_OP_stack_value) | |
3955 | { | |
3956 | fprintf_filtered (stream, _("the constant %d"), data[0] - DW_OP_lit0); | |
3957 | data += 2; | |
3958 | } | |
3959 | ||
3960 | return data; | |
3961 | } | |
3962 | ||
3963 | /* Disassemble an expression, stopping at the end of a piece or at the | |
3964 | end of the expression. Returns a pointer to the next unread byte | |
3965 | in the input expression. If ALL is nonzero, then this function | |
f664829e DE |
3966 | will keep going until it reaches the end of the expression. |
3967 | If there is an error during reading, e.g. we run off the end | |
3968 | of the buffer, an error is thrown. */ | |
9eae7c52 TT |
3969 | |
3970 | static const gdb_byte * | |
3971 | disassemble_dwarf_expression (struct ui_file *stream, | |
3972 | struct gdbarch *arch, unsigned int addr_size, | |
2bda9cc5 | 3973 | int offset_size, const gdb_byte *start, |
9eae7c52 | 3974 | const gdb_byte *data, const gdb_byte *end, |
2bda9cc5 | 3975 | int indent, int all, |
5e44ecb3 | 3976 | struct dwarf2_per_cu_data *per_cu) |
9eae7c52 | 3977 | { |
9eae7c52 TT |
3978 | while (data < end |
3979 | && (all | |
3980 | || (data[0] != DW_OP_piece && data[0] != DW_OP_bit_piece))) | |
3981 | { | |
aead7601 | 3982 | enum dwarf_location_atom op = (enum dwarf_location_atom) *data++; |
9fccedf7 DE |
3983 | uint64_t ul; |
3984 | int64_t l; | |
9eae7c52 TT |
3985 | const char *name; |
3986 | ||
f39c6ffd | 3987 | name = get_DW_OP_name (op); |
9eae7c52 TT |
3988 | |
3989 | if (!name) | |
3990 | error (_("Unrecognized DWARF opcode 0x%02x at %ld"), | |
06826322 | 3991 | op, (long) (data - 1 - start)); |
2bda9cc5 JK |
3992 | fprintf_filtered (stream, " %*ld: %s", indent + 4, |
3993 | (long) (data - 1 - start), name); | |
9eae7c52 TT |
3994 | |
3995 | switch (op) | |
3996 | { | |
3997 | case DW_OP_addr: | |
d4a087c7 UW |
3998 | ul = extract_unsigned_integer (data, addr_size, |
3999 | gdbarch_byte_order (arch)); | |
9eae7c52 | 4000 | data += addr_size; |
d4a087c7 | 4001 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); |
9eae7c52 TT |
4002 | break; |
4003 | ||
4004 | case DW_OP_const1u: | |
4005 | ul = extract_unsigned_integer (data, 1, gdbarch_byte_order (arch)); | |
4006 | data += 1; | |
4007 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4008 | break; | |
4009 | case DW_OP_const1s: | |
4010 | l = extract_signed_integer (data, 1, gdbarch_byte_order (arch)); | |
4011 | data += 1; | |
4012 | fprintf_filtered (stream, " %s", plongest (l)); | |
4013 | break; | |
4014 | case DW_OP_const2u: | |
4015 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
4016 | data += 2; | |
4017 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4018 | break; | |
4019 | case DW_OP_const2s: | |
4020 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4021 | data += 2; | |
4022 | fprintf_filtered (stream, " %s", plongest (l)); | |
4023 | break; | |
4024 | case DW_OP_const4u: | |
4025 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4026 | data += 4; | |
4027 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4028 | break; | |
4029 | case DW_OP_const4s: | |
4030 | l = extract_signed_integer (data, 4, gdbarch_byte_order (arch)); | |
4031 | data += 4; | |
4032 | fprintf_filtered (stream, " %s", plongest (l)); | |
4033 | break; | |
4034 | case DW_OP_const8u: | |
4035 | ul = extract_unsigned_integer (data, 8, gdbarch_byte_order (arch)); | |
4036 | data += 8; | |
4037 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4038 | break; | |
4039 | case DW_OP_const8s: | |
4040 | l = extract_signed_integer (data, 8, gdbarch_byte_order (arch)); | |
4041 | data += 8; | |
4042 | fprintf_filtered (stream, " %s", plongest (l)); | |
4043 | break; | |
4044 | case DW_OP_constu: | |
f664829e | 4045 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4046 | fprintf_filtered (stream, " %s", pulongest (ul)); |
4047 | break; | |
4048 | case DW_OP_consts: | |
f664829e | 4049 | data = safe_read_sleb128 (data, end, &l); |
9eae7c52 TT |
4050 | fprintf_filtered (stream, " %s", plongest (l)); |
4051 | break; | |
4052 | ||
4053 | case DW_OP_reg0: | |
4054 | case DW_OP_reg1: | |
4055 | case DW_OP_reg2: | |
4056 | case DW_OP_reg3: | |
4057 | case DW_OP_reg4: | |
4058 | case DW_OP_reg5: | |
4059 | case DW_OP_reg6: | |
4060 | case DW_OP_reg7: | |
4061 | case DW_OP_reg8: | |
4062 | case DW_OP_reg9: | |
4063 | case DW_OP_reg10: | |
4064 | case DW_OP_reg11: | |
4065 | case DW_OP_reg12: | |
4066 | case DW_OP_reg13: | |
4067 | case DW_OP_reg14: | |
4068 | case DW_OP_reg15: | |
4069 | case DW_OP_reg16: | |
4070 | case DW_OP_reg17: | |
4071 | case DW_OP_reg18: | |
4072 | case DW_OP_reg19: | |
4073 | case DW_OP_reg20: | |
4074 | case DW_OP_reg21: | |
4075 | case DW_OP_reg22: | |
4076 | case DW_OP_reg23: | |
4077 | case DW_OP_reg24: | |
4078 | case DW_OP_reg25: | |
4079 | case DW_OP_reg26: | |
4080 | case DW_OP_reg27: | |
4081 | case DW_OP_reg28: | |
4082 | case DW_OP_reg29: | |
4083 | case DW_OP_reg30: | |
4084 | case DW_OP_reg31: | |
4085 | fprintf_filtered (stream, " [$%s]", | |
5e44ecb3 | 4086 | locexpr_regname (arch, op - DW_OP_reg0)); |
9eae7c52 TT |
4087 | break; |
4088 | ||
4089 | case DW_OP_regx: | |
f664829e | 4090 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 | 4091 | fprintf_filtered (stream, " %s [$%s]", pulongest (ul), |
5e44ecb3 | 4092 | locexpr_regname (arch, (int) ul)); |
9eae7c52 TT |
4093 | break; |
4094 | ||
4095 | case DW_OP_implicit_value: | |
f664829e | 4096 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4097 | data += ul; |
4098 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4099 | break; | |
4100 | ||
4101 | case DW_OP_breg0: | |
4102 | case DW_OP_breg1: | |
4103 | case DW_OP_breg2: | |
4104 | case DW_OP_breg3: | |
4105 | case DW_OP_breg4: | |
4106 | case DW_OP_breg5: | |
4107 | case DW_OP_breg6: | |
4108 | case DW_OP_breg7: | |
4109 | case DW_OP_breg8: | |
4110 | case DW_OP_breg9: | |
4111 | case DW_OP_breg10: | |
4112 | case DW_OP_breg11: | |
4113 | case DW_OP_breg12: | |
4114 | case DW_OP_breg13: | |
4115 | case DW_OP_breg14: | |
4116 | case DW_OP_breg15: | |
4117 | case DW_OP_breg16: | |
4118 | case DW_OP_breg17: | |
4119 | case DW_OP_breg18: | |
4120 | case DW_OP_breg19: | |
4121 | case DW_OP_breg20: | |
4122 | case DW_OP_breg21: | |
4123 | case DW_OP_breg22: | |
4124 | case DW_OP_breg23: | |
4125 | case DW_OP_breg24: | |
4126 | case DW_OP_breg25: | |
4127 | case DW_OP_breg26: | |
4128 | case DW_OP_breg27: | |
4129 | case DW_OP_breg28: | |
4130 | case DW_OP_breg29: | |
4131 | case DW_OP_breg30: | |
4132 | case DW_OP_breg31: | |
f664829e | 4133 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 4134 | fprintf_filtered (stream, " %s [$%s]", plongest (l), |
5e44ecb3 | 4135 | locexpr_regname (arch, op - DW_OP_breg0)); |
9eae7c52 TT |
4136 | break; |
4137 | ||
4138 | case DW_OP_bregx: | |
f664829e DE |
4139 | data = safe_read_uleb128 (data, end, &ul); |
4140 | data = safe_read_sleb128 (data, end, &l); | |
0502ed8c JK |
4141 | fprintf_filtered (stream, " register %s [$%s] offset %s", |
4142 | pulongest (ul), | |
5e44ecb3 | 4143 | locexpr_regname (arch, (int) ul), |
0502ed8c | 4144 | plongest (l)); |
9eae7c52 TT |
4145 | break; |
4146 | ||
4147 | case DW_OP_fbreg: | |
f664829e | 4148 | data = safe_read_sleb128 (data, end, &l); |
0502ed8c | 4149 | fprintf_filtered (stream, " %s", plongest (l)); |
9eae7c52 TT |
4150 | break; |
4151 | ||
4152 | case DW_OP_xderef_size: | |
4153 | case DW_OP_deref_size: | |
4154 | case DW_OP_pick: | |
4155 | fprintf_filtered (stream, " %d", *data); | |
4156 | ++data; | |
4157 | break; | |
4158 | ||
4159 | case DW_OP_plus_uconst: | |
f664829e | 4160 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4161 | fprintf_filtered (stream, " %s", pulongest (ul)); |
4162 | break; | |
4163 | ||
4164 | case DW_OP_skip: | |
4165 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4166 | data += 2; | |
4167 | fprintf_filtered (stream, " to %ld", | |
4168 | (long) (data + l - start)); | |
4169 | break; | |
4170 | ||
4171 | case DW_OP_bra: | |
4172 | l = extract_signed_integer (data, 2, gdbarch_byte_order (arch)); | |
4173 | data += 2; | |
4174 | fprintf_filtered (stream, " %ld", | |
4175 | (long) (data + l - start)); | |
4176 | break; | |
4177 | ||
4178 | case DW_OP_call2: | |
4179 | ul = extract_unsigned_integer (data, 2, gdbarch_byte_order (arch)); | |
4180 | data += 2; | |
4181 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 2)); | |
4182 | break; | |
4183 | ||
4184 | case DW_OP_call4: | |
4185 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4186 | data += 4; | |
4187 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4188 | break; | |
4189 | ||
4190 | case DW_OP_call_ref: | |
4191 | ul = extract_unsigned_integer (data, offset_size, | |
4192 | gdbarch_byte_order (arch)); | |
4193 | data += offset_size; | |
4194 | fprintf_filtered (stream, " offset %s", phex_nz (ul, offset_size)); | |
4195 | break; | |
4196 | ||
4197 | case DW_OP_piece: | |
f664829e | 4198 | data = safe_read_uleb128 (data, end, &ul); |
9eae7c52 TT |
4199 | fprintf_filtered (stream, " %s (bytes)", pulongest (ul)); |
4200 | break; | |
4201 | ||
4202 | case DW_OP_bit_piece: | |
4203 | { | |
9fccedf7 | 4204 | uint64_t offset; |
9eae7c52 | 4205 | |
f664829e DE |
4206 | data = safe_read_uleb128 (data, end, &ul); |
4207 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4208 | fprintf_filtered (stream, " size %s offset %s (bits)", |
4209 | pulongest (ul), pulongest (offset)); | |
4210 | } | |
4211 | break; | |
8cf6f0b1 TT |
4212 | |
4213 | case DW_OP_GNU_implicit_pointer: | |
4214 | { | |
4215 | ul = extract_unsigned_integer (data, offset_size, | |
4216 | gdbarch_byte_order (arch)); | |
4217 | data += offset_size; | |
4218 | ||
f664829e | 4219 | data = safe_read_sleb128 (data, end, &l); |
8cf6f0b1 TT |
4220 | |
4221 | fprintf_filtered (stream, " DIE %s offset %s", | |
4222 | phex_nz (ul, offset_size), | |
4223 | plongest (l)); | |
4224 | } | |
4225 | break; | |
5e44ecb3 TT |
4226 | |
4227 | case DW_OP_GNU_deref_type: | |
4228 | { | |
4229 | int addr_size = *data++; | |
b64f50a1 | 4230 | cu_offset offset; |
5e44ecb3 TT |
4231 | struct type *type; |
4232 | ||
f664829e | 4233 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 4234 | offset.cu_off = ul; |
5e44ecb3 TT |
4235 | type = dwarf2_get_die_type (offset, per_cu); |
4236 | fprintf_filtered (stream, "<"); | |
4237 | type_print (type, "", stream, -1); | |
b64f50a1 | 4238 | fprintf_filtered (stream, " [0x%s]> %d", phex_nz (offset.cu_off, 0), |
5e44ecb3 TT |
4239 | addr_size); |
4240 | } | |
4241 | break; | |
4242 | ||
4243 | case DW_OP_GNU_const_type: | |
4244 | { | |
b64f50a1 | 4245 | cu_offset type_die; |
5e44ecb3 TT |
4246 | struct type *type; |
4247 | ||
f664829e | 4248 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 4249 | type_die.cu_off = ul; |
5e44ecb3 TT |
4250 | type = dwarf2_get_die_type (type_die, per_cu); |
4251 | fprintf_filtered (stream, "<"); | |
4252 | type_print (type, "", stream, -1); | |
b64f50a1 | 4253 | fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die.cu_off, 0)); |
5e44ecb3 TT |
4254 | } |
4255 | break; | |
4256 | ||
4257 | case DW_OP_GNU_regval_type: | |
4258 | { | |
9fccedf7 | 4259 | uint64_t reg; |
b64f50a1 | 4260 | cu_offset type_die; |
5e44ecb3 TT |
4261 | struct type *type; |
4262 | ||
f664829e DE |
4263 | data = safe_read_uleb128 (data, end, ®); |
4264 | data = safe_read_uleb128 (data, end, &ul); | |
b64f50a1 | 4265 | type_die.cu_off = ul; |
5e44ecb3 TT |
4266 | |
4267 | type = dwarf2_get_die_type (type_die, per_cu); | |
4268 | fprintf_filtered (stream, "<"); | |
4269 | type_print (type, "", stream, -1); | |
b64f50a1 JK |
4270 | fprintf_filtered (stream, " [0x%s]> [$%s]", |
4271 | phex_nz (type_die.cu_off, 0), | |
5e44ecb3 TT |
4272 | locexpr_regname (arch, reg)); |
4273 | } | |
4274 | break; | |
4275 | ||
4276 | case DW_OP_GNU_convert: | |
4277 | case DW_OP_GNU_reinterpret: | |
4278 | { | |
b64f50a1 | 4279 | cu_offset type_die; |
5e44ecb3 | 4280 | |
f664829e | 4281 | data = safe_read_uleb128 (data, end, &ul); |
b64f50a1 | 4282 | type_die.cu_off = ul; |
5e44ecb3 | 4283 | |
b64f50a1 | 4284 | if (type_die.cu_off == 0) |
5e44ecb3 TT |
4285 | fprintf_filtered (stream, "<0>"); |
4286 | else | |
4287 | { | |
4288 | struct type *type; | |
4289 | ||
4290 | type = dwarf2_get_die_type (type_die, per_cu); | |
4291 | fprintf_filtered (stream, "<"); | |
4292 | type_print (type, "", stream, -1); | |
b64f50a1 | 4293 | fprintf_filtered (stream, " [0x%s]>", phex_nz (type_die.cu_off, 0)); |
5e44ecb3 TT |
4294 | } |
4295 | } | |
4296 | break; | |
2bda9cc5 JK |
4297 | |
4298 | case DW_OP_GNU_entry_value: | |
f664829e | 4299 | data = safe_read_uleb128 (data, end, &ul); |
2bda9cc5 JK |
4300 | fputc_filtered ('\n', stream); |
4301 | disassemble_dwarf_expression (stream, arch, addr_size, offset_size, | |
4302 | start, data, data + ul, indent + 2, | |
4303 | all, per_cu); | |
4304 | data += ul; | |
4305 | continue; | |
49f6c839 | 4306 | |
a24f71ab JK |
4307 | case DW_OP_GNU_parameter_ref: |
4308 | ul = extract_unsigned_integer (data, 4, gdbarch_byte_order (arch)); | |
4309 | data += 4; | |
4310 | fprintf_filtered (stream, " offset %s", phex_nz (ul, 4)); | |
4311 | break; | |
4312 | ||
49f6c839 DE |
4313 | case DW_OP_GNU_addr_index: |
4314 | data = safe_read_uleb128 (data, end, &ul); | |
4315 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4316 | fprintf_filtered (stream, " 0x%s", phex_nz (ul, addr_size)); | |
4317 | break; | |
4318 | case DW_OP_GNU_const_index: | |
4319 | data = safe_read_uleb128 (data, end, &ul); | |
4320 | ul = dwarf2_read_addr_index (per_cu, ul); | |
4321 | fprintf_filtered (stream, " %s", pulongest (ul)); | |
4322 | break; | |
9eae7c52 TT |
4323 | } |
4324 | ||
4325 | fprintf_filtered (stream, "\n"); | |
4326 | } | |
c3228f12 | 4327 | |
08922a10 | 4328 | return data; |
4c2df51b DJ |
4329 | } |
4330 | ||
08922a10 SS |
4331 | /* Describe a single location, which may in turn consist of multiple |
4332 | pieces. */ | |
a55cc764 | 4333 | |
08922a10 SS |
4334 | static void |
4335 | locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr, | |
0d45f56e | 4336 | struct ui_file *stream, |
56eb65bd | 4337 | const gdb_byte *data, size_t size, |
9eae7c52 | 4338 | struct objfile *objfile, unsigned int addr_size, |
5e44ecb3 | 4339 | int offset_size, struct dwarf2_per_cu_data *per_cu) |
08922a10 | 4340 | { |
0d45f56e | 4341 | const gdb_byte *end = data + size; |
9eae7c52 | 4342 | int first_piece = 1, bad = 0; |
08922a10 | 4343 | |
08922a10 SS |
4344 | while (data < end) |
4345 | { | |
9eae7c52 TT |
4346 | const gdb_byte *here = data; |
4347 | int disassemble = 1; | |
4348 | ||
4349 | if (first_piece) | |
4350 | first_piece = 0; | |
4351 | else | |
4352 | fprintf_filtered (stream, _(", and ")); | |
08922a10 | 4353 | |
b4f54984 | 4354 | if (!dwarf_always_disassemble) |
9eae7c52 | 4355 | { |
3e43a32a | 4356 | data = locexpr_describe_location_piece (symbol, stream, |
49f6c839 | 4357 | addr, objfile, per_cu, |
9eae7c52 TT |
4358 | data, end, addr_size); |
4359 | /* If we printed anything, or if we have an empty piece, | |
4360 | then don't disassemble. */ | |
4361 | if (data != here | |
4362 | || data[0] == DW_OP_piece | |
4363 | || data[0] == DW_OP_bit_piece) | |
4364 | disassemble = 0; | |
08922a10 | 4365 | } |
9eae7c52 | 4366 | if (disassemble) |
2bda9cc5 JK |
4367 | { |
4368 | fprintf_filtered (stream, _("a complex DWARF expression:\n")); | |
4369 | data = disassemble_dwarf_expression (stream, | |
4370 | get_objfile_arch (objfile), | |
4371 | addr_size, offset_size, data, | |
4372 | data, end, 0, | |
b4f54984 | 4373 | dwarf_always_disassemble, |
2bda9cc5 JK |
4374 | per_cu); |
4375 | } | |
9eae7c52 TT |
4376 | |
4377 | if (data < end) | |
08922a10 | 4378 | { |
9eae7c52 | 4379 | int empty = data == here; |
08922a10 | 4380 | |
9eae7c52 TT |
4381 | if (disassemble) |
4382 | fprintf_filtered (stream, " "); | |
4383 | if (data[0] == DW_OP_piece) | |
4384 | { | |
9fccedf7 | 4385 | uint64_t bytes; |
08922a10 | 4386 | |
f664829e | 4387 | data = safe_read_uleb128 (data + 1, end, &bytes); |
08922a10 | 4388 | |
9eae7c52 TT |
4389 | if (empty) |
4390 | fprintf_filtered (stream, _("an empty %s-byte piece"), | |
4391 | pulongest (bytes)); | |
4392 | else | |
4393 | fprintf_filtered (stream, _(" [%s-byte piece]"), | |
4394 | pulongest (bytes)); | |
4395 | } | |
4396 | else if (data[0] == DW_OP_bit_piece) | |
4397 | { | |
9fccedf7 | 4398 | uint64_t bits, offset; |
9eae7c52 | 4399 | |
f664829e DE |
4400 | data = safe_read_uleb128 (data + 1, end, &bits); |
4401 | data = safe_read_uleb128 (data, end, &offset); | |
9eae7c52 TT |
4402 | |
4403 | if (empty) | |
4404 | fprintf_filtered (stream, | |
4405 | _("an empty %s-bit piece"), | |
4406 | pulongest (bits)); | |
4407 | else | |
4408 | fprintf_filtered (stream, | |
4409 | _(" [%s-bit piece, offset %s bits]"), | |
4410 | pulongest (bits), pulongest (offset)); | |
4411 | } | |
4412 | else | |
4413 | { | |
4414 | bad = 1; | |
4415 | break; | |
4416 | } | |
08922a10 SS |
4417 | } |
4418 | } | |
4419 | ||
4420 | if (bad || data > end) | |
4421 | error (_("Corrupted DWARF2 expression for \"%s\"."), | |
4422 | SYMBOL_PRINT_NAME (symbol)); | |
4423 | } | |
4424 | ||
4425 | /* Print a natural-language description of SYMBOL to STREAM. This | |
4426 | version is for a symbol with a single location. */ | |
a55cc764 | 4427 | |
08922a10 SS |
4428 | static void |
4429 | locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4430 | struct ui_file *stream) | |
4431 | { | |
9a3c8263 SM |
4432 | struct dwarf2_locexpr_baton *dlbaton |
4433 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
08922a10 SS |
4434 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4435 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4436 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
08922a10 | 4437 | |
3e43a32a MS |
4438 | locexpr_describe_location_1 (symbol, addr, stream, |
4439 | dlbaton->data, dlbaton->size, | |
5e44ecb3 TT |
4440 | objfile, addr_size, offset_size, |
4441 | dlbaton->per_cu); | |
08922a10 SS |
4442 | } |
4443 | ||
4444 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4445 | any necessary bytecode in AX. */ | |
a55cc764 | 4446 | |
0d53c4c4 | 4447 | static void |
505e835d UW |
4448 | locexpr_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch, |
4449 | struct agent_expr *ax, struct axs_value *value) | |
a55cc764 | 4450 | { |
9a3c8263 SM |
4451 | struct dwarf2_locexpr_baton *dlbaton |
4452 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (symbol); | |
3cf03773 | 4453 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
a55cc764 | 4454 | |
1d6edc3c | 4455 | if (dlbaton->size == 0) |
cabe9ab6 PA |
4456 | value->optimized_out = 1; |
4457 | else | |
9f6f94ff TT |
4458 | dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, |
4459 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4460 | dlbaton->per_cu); | |
a55cc764 DJ |
4461 | } |
4462 | ||
bb2ec1b3 TT |
4463 | /* symbol_computed_ops 'generate_c_location' method. */ |
4464 | ||
4465 | static void | |
4466 | locexpr_generate_c_location (struct symbol *sym, struct ui_file *stream, | |
4467 | struct gdbarch *gdbarch, | |
4468 | unsigned char *registers_used, | |
4469 | CORE_ADDR pc, const char *result_name) | |
4470 | { | |
9a3c8263 SM |
4471 | struct dwarf2_locexpr_baton *dlbaton |
4472 | = (struct dwarf2_locexpr_baton *) SYMBOL_LOCATION_BATON (sym); | |
bb2ec1b3 TT |
4473 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
4474 | ||
4475 | if (dlbaton->size == 0) | |
4476 | error (_("symbol \"%s\" is optimized out"), SYMBOL_NATURAL_NAME (sym)); | |
4477 | ||
4478 | compile_dwarf_expr_to_c (stream, result_name, | |
4479 | sym, pc, gdbarch, registers_used, addr_size, | |
4480 | dlbaton->data, dlbaton->data + dlbaton->size, | |
4481 | dlbaton->per_cu); | |
4482 | } | |
4483 | ||
4c2df51b DJ |
4484 | /* The set of location functions used with the DWARF-2 expression |
4485 | evaluator. */ | |
768a979c | 4486 | const struct symbol_computed_ops dwarf2_locexpr_funcs = { |
4c2df51b | 4487 | locexpr_read_variable, |
e18b2753 | 4488 | locexpr_read_variable_at_entry, |
0b31a4bc | 4489 | locexpr_get_symbol_read_needs, |
4c2df51b | 4490 | locexpr_describe_location, |
f1e6e072 | 4491 | 0, /* location_has_loclist */ |
bb2ec1b3 TT |
4492 | locexpr_tracepoint_var_ref, |
4493 | locexpr_generate_c_location | |
4c2df51b | 4494 | }; |
0d53c4c4 DJ |
4495 | |
4496 | ||
4497 | /* Wrapper functions for location lists. These generally find | |
4498 | the appropriate location expression and call something above. */ | |
4499 | ||
4500 | /* Return the value of SYMBOL in FRAME using the DWARF-2 expression | |
4501 | evaluator to calculate the location. */ | |
4502 | static struct value * | |
4503 | loclist_read_variable (struct symbol *symbol, struct frame_info *frame) | |
4504 | { | |
9a3c8263 SM |
4505 | struct dwarf2_loclist_baton *dlbaton |
4506 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
0d53c4c4 | 4507 | struct value *val; |
947bb88f | 4508 | const gdb_byte *data; |
b6b08ebf | 4509 | size_t size; |
8cf6f0b1 | 4510 | CORE_ADDR pc = frame ? get_frame_address_in_block (frame) : 0; |
0d53c4c4 | 4511 | |
8cf6f0b1 | 4512 | data = dwarf2_find_location_expression (dlbaton, &size, pc); |
1d6edc3c JK |
4513 | val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, data, size, |
4514 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4515 | |
4516 | return val; | |
4517 | } | |
4518 | ||
e18b2753 JK |
4519 | /* Read variable SYMBOL like loclist_read_variable at (callee) FRAME's function |
4520 | entry. SYMBOL should be a function parameter, otherwise NO_ENTRY_VALUE_ERROR | |
4521 | will be thrown. | |
4522 | ||
4523 | Function always returns non-NULL value, it may be marked optimized out if | |
4524 | inferior frame information is not available. It throws NO_ENTRY_VALUE_ERROR | |
4525 | if it cannot resolve the parameter for any reason. */ | |
4526 | ||
4527 | static struct value * | |
4528 | loclist_read_variable_at_entry (struct symbol *symbol, struct frame_info *frame) | |
4529 | { | |
9a3c8263 SM |
4530 | struct dwarf2_loclist_baton *dlbaton |
4531 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
e18b2753 JK |
4532 | const gdb_byte *data; |
4533 | size_t size; | |
4534 | CORE_ADDR pc; | |
4535 | ||
4536 | if (frame == NULL || !get_frame_func_if_available (frame, &pc)) | |
4537 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4538 | ||
4539 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4540 | if (data == NULL) | |
4541 | return allocate_optimized_out_value (SYMBOL_TYPE (symbol)); | |
4542 | ||
4543 | return value_of_dwarf_block_entry (SYMBOL_TYPE (symbol), frame, data, size); | |
4544 | } | |
4545 | ||
0b31a4bc TT |
4546 | /* Implementation of get_symbol_read_needs from |
4547 | symbol_computed_ops. */ | |
4548 | ||
4549 | static enum symbol_needs_kind | |
4550 | loclist_symbol_needs (struct symbol *symbol) | |
0d53c4c4 DJ |
4551 | { |
4552 | /* If there's a location list, then assume we need to have a frame | |
4553 | to choose the appropriate location expression. With tracking of | |
4554 | global variables this is not necessarily true, but such tracking | |
4555 | is disabled in GCC at the moment until we figure out how to | |
4556 | represent it. */ | |
4557 | ||
0b31a4bc | 4558 | return SYMBOL_NEEDS_FRAME; |
0d53c4c4 DJ |
4559 | } |
4560 | ||
08922a10 SS |
4561 | /* Print a natural-language description of SYMBOL to STREAM. This |
4562 | version applies when there is a list of different locations, each | |
4563 | with a specified address range. */ | |
4564 | ||
4565 | static void | |
4566 | loclist_describe_location (struct symbol *symbol, CORE_ADDR addr, | |
4567 | struct ui_file *stream) | |
0d53c4c4 | 4568 | { |
9a3c8263 SM |
4569 | struct dwarf2_loclist_baton *dlbaton |
4570 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4571 | const gdb_byte *loc_ptr, *buf_end; |
08922a10 SS |
4572 | struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu); |
4573 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
4574 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
4575 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); | |
9eae7c52 | 4576 | int offset_size = dwarf2_per_cu_offset_size (dlbaton->per_cu); |
d4a087c7 | 4577 | int signed_addr_p = bfd_get_sign_extend_vma (objfile->obfd); |
08922a10 | 4578 | /* Adjust base_address for relocatable objects. */ |
9aa1f1e3 | 4579 | CORE_ADDR base_offset = dwarf2_per_cu_text_offset (dlbaton->per_cu); |
08922a10 | 4580 | CORE_ADDR base_address = dlbaton->base_address + base_offset; |
f664829e | 4581 | int done = 0; |
08922a10 SS |
4582 | |
4583 | loc_ptr = dlbaton->data; | |
4584 | buf_end = dlbaton->data + dlbaton->size; | |
4585 | ||
9eae7c52 | 4586 | fprintf_filtered (stream, _("multi-location:\n")); |
08922a10 SS |
4587 | |
4588 | /* Iterate through locations until we run out. */ | |
f664829e | 4589 | while (!done) |
08922a10 | 4590 | { |
f664829e DE |
4591 | CORE_ADDR low = 0, high = 0; /* init for gcc -Wall */ |
4592 | int length; | |
4593 | enum debug_loc_kind kind; | |
4594 | const gdb_byte *new_ptr = NULL; /* init for gcc -Wall */ | |
4595 | ||
4596 | if (dlbaton->from_dwo) | |
4597 | kind = decode_debug_loc_dwo_addresses (dlbaton->per_cu, | |
4598 | loc_ptr, buf_end, &new_ptr, | |
3771a44c | 4599 | &low, &high, byte_order); |
d4a087c7 | 4600 | else |
f664829e DE |
4601 | kind = decode_debug_loc_addresses (loc_ptr, buf_end, &new_ptr, |
4602 | &low, &high, | |
4603 | byte_order, addr_size, | |
4604 | signed_addr_p); | |
4605 | loc_ptr = new_ptr; | |
4606 | switch (kind) | |
08922a10 | 4607 | { |
f664829e DE |
4608 | case DEBUG_LOC_END_OF_LIST: |
4609 | done = 1; | |
4610 | continue; | |
4611 | case DEBUG_LOC_BASE_ADDRESS: | |
d4a087c7 | 4612 | base_address = high + base_offset; |
9eae7c52 | 4613 | fprintf_filtered (stream, _(" Base address %s"), |
08922a10 | 4614 | paddress (gdbarch, base_address)); |
08922a10 | 4615 | continue; |
3771a44c DE |
4616 | case DEBUG_LOC_START_END: |
4617 | case DEBUG_LOC_START_LENGTH: | |
f664829e DE |
4618 | break; |
4619 | case DEBUG_LOC_BUFFER_OVERFLOW: | |
4620 | case DEBUG_LOC_INVALID_ENTRY: | |
4621 | error (_("Corrupted DWARF expression for symbol \"%s\"."), | |
4622 | SYMBOL_PRINT_NAME (symbol)); | |
4623 | default: | |
4624 | gdb_assert_not_reached ("bad debug_loc_kind"); | |
08922a10 SS |
4625 | } |
4626 | ||
08922a10 SS |
4627 | /* Otherwise, a location expression entry. */ |
4628 | low += base_address; | |
4629 | high += base_address; | |
4630 | ||
3e29f34a MR |
4631 | low = gdbarch_adjust_dwarf2_addr (gdbarch, low); |
4632 | high = gdbarch_adjust_dwarf2_addr (gdbarch, high); | |
4633 | ||
08922a10 SS |
4634 | length = extract_unsigned_integer (loc_ptr, 2, byte_order); |
4635 | loc_ptr += 2; | |
4636 | ||
08922a10 SS |
4637 | /* (It would improve readability to print only the minimum |
4638 | necessary digits of the second number of the range.) */ | |
9eae7c52 | 4639 | fprintf_filtered (stream, _(" Range %s-%s: "), |
08922a10 SS |
4640 | paddress (gdbarch, low), paddress (gdbarch, high)); |
4641 | ||
4642 | /* Now describe this particular location. */ | |
4643 | locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length, | |
5e44ecb3 TT |
4644 | objfile, addr_size, offset_size, |
4645 | dlbaton->per_cu); | |
9eae7c52 TT |
4646 | |
4647 | fprintf_filtered (stream, "\n"); | |
08922a10 SS |
4648 | |
4649 | loc_ptr += length; | |
4650 | } | |
0d53c4c4 DJ |
4651 | } |
4652 | ||
4653 | /* Describe the location of SYMBOL as an agent value in VALUE, generating | |
4654 | any necessary bytecode in AX. */ | |
4655 | static void | |
505e835d UW |
4656 | loclist_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch, |
4657 | struct agent_expr *ax, struct axs_value *value) | |
0d53c4c4 | 4658 | { |
9a3c8263 SM |
4659 | struct dwarf2_loclist_baton *dlbaton |
4660 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (symbol); | |
947bb88f | 4661 | const gdb_byte *data; |
b6b08ebf | 4662 | size_t size; |
3cf03773 | 4663 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
0d53c4c4 | 4664 | |
8cf6f0b1 | 4665 | data = dwarf2_find_location_expression (dlbaton, &size, ax->scope); |
1d6edc3c | 4666 | if (size == 0) |
cabe9ab6 PA |
4667 | value->optimized_out = 1; |
4668 | else | |
9f6f94ff TT |
4669 | dwarf2_compile_expr_to_ax (ax, value, gdbarch, addr_size, data, data + size, |
4670 | dlbaton->per_cu); | |
0d53c4c4 DJ |
4671 | } |
4672 | ||
bb2ec1b3 TT |
4673 | /* symbol_computed_ops 'generate_c_location' method. */ |
4674 | ||
4675 | static void | |
4676 | loclist_generate_c_location (struct symbol *sym, struct ui_file *stream, | |
4677 | struct gdbarch *gdbarch, | |
4678 | unsigned char *registers_used, | |
4679 | CORE_ADDR pc, const char *result_name) | |
4680 | { | |
9a3c8263 SM |
4681 | struct dwarf2_loclist_baton *dlbaton |
4682 | = (struct dwarf2_loclist_baton *) SYMBOL_LOCATION_BATON (sym); | |
bb2ec1b3 TT |
4683 | unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu); |
4684 | const gdb_byte *data; | |
4685 | size_t size; | |
4686 | ||
4687 | data = dwarf2_find_location_expression (dlbaton, &size, pc); | |
4688 | if (size == 0) | |
4689 | error (_("symbol \"%s\" is optimized out"), SYMBOL_NATURAL_NAME (sym)); | |
4690 | ||
4691 | compile_dwarf_expr_to_c (stream, result_name, | |
4692 | sym, pc, gdbarch, registers_used, addr_size, | |
4693 | data, data + size, | |
4694 | dlbaton->per_cu); | |
4695 | } | |
4696 | ||
0d53c4c4 DJ |
4697 | /* The set of location functions used with the DWARF-2 expression |
4698 | evaluator and location lists. */ | |
768a979c | 4699 | const struct symbol_computed_ops dwarf2_loclist_funcs = { |
0d53c4c4 | 4700 | loclist_read_variable, |
e18b2753 | 4701 | loclist_read_variable_at_entry, |
0b31a4bc | 4702 | loclist_symbol_needs, |
0d53c4c4 | 4703 | loclist_describe_location, |
f1e6e072 | 4704 | 1, /* location_has_loclist */ |
bb2ec1b3 TT |
4705 | loclist_tracepoint_var_ref, |
4706 | loclist_generate_c_location | |
0d53c4c4 | 4707 | }; |
8e3b41a9 | 4708 | |
70221824 PA |
4709 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
4710 | extern initialize_file_ftype _initialize_dwarf2loc; | |
4711 | ||
8e3b41a9 JK |
4712 | void |
4713 | _initialize_dwarf2loc (void) | |
4714 | { | |
ccce17b0 YQ |
4715 | add_setshow_zuinteger_cmd ("entry-values", class_maintenance, |
4716 | &entry_values_debug, | |
4717 | _("Set entry values and tail call frames " | |
4718 | "debugging."), | |
4719 | _("Show entry values and tail call frames " | |
4720 | "debugging."), | |
4721 | _("When non-zero, the process of determining " | |
4722 | "parameter values from function entry point " | |
4723 | "and tail call frames will be printed."), | |
4724 | NULL, | |
4725 | show_entry_values_debug, | |
4726 | &setdebuglist, &showdebuglist); | |
8e3b41a9 | 4727 | } |