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02d27625 MM |
1 | /* Branch trace support for GDB, the GNU debugger. |
2 | ||
32d0add0 | 3 | Copyright (C) 2013-2015 Free Software Foundation, Inc. |
02d27625 MM |
4 | |
5 | Contributed by Intel Corp. <markus.t.metzger@intel.com> | |
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 | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
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. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
21 | ||
d41f6d8e | 22 | #include "defs.h" |
02d27625 MM |
23 | #include "btrace.h" |
24 | #include "gdbthread.h" | |
02d27625 MM |
25 | #include "inferior.h" |
26 | #include "target.h" | |
27 | #include "record.h" | |
28 | #include "symtab.h" | |
29 | #include "disasm.h" | |
30 | #include "source.h" | |
31 | #include "filenames.h" | |
c12a2917 | 32 | #include "xml-support.h" |
6e07b1d2 | 33 | #include "regcache.h" |
02d27625 MM |
34 | |
35 | /* Print a record debug message. Use do ... while (0) to avoid ambiguities | |
36 | when used in if statements. */ | |
37 | ||
38 | #define DEBUG(msg, args...) \ | |
39 | do \ | |
40 | { \ | |
41 | if (record_debug != 0) \ | |
42 | fprintf_unfiltered (gdb_stdlog, \ | |
43 | "[btrace] " msg "\n", ##args); \ | |
44 | } \ | |
45 | while (0) | |
46 | ||
47 | #define DEBUG_FTRACE(msg, args...) DEBUG ("[ftrace] " msg, ##args) | |
48 | ||
02d27625 MM |
49 | /* Return the function name of a recorded function segment for printing. |
50 | This function never returns NULL. */ | |
51 | ||
52 | static const char * | |
23a7fe75 | 53 | ftrace_print_function_name (const struct btrace_function *bfun) |
02d27625 MM |
54 | { |
55 | struct minimal_symbol *msym; | |
56 | struct symbol *sym; | |
57 | ||
58 | msym = bfun->msym; | |
59 | sym = bfun->sym; | |
60 | ||
61 | if (sym != NULL) | |
62 | return SYMBOL_PRINT_NAME (sym); | |
63 | ||
64 | if (msym != NULL) | |
efd66ac6 | 65 | return MSYMBOL_PRINT_NAME (msym); |
02d27625 MM |
66 | |
67 | return "<unknown>"; | |
68 | } | |
69 | ||
70 | /* Return the file name of a recorded function segment for printing. | |
71 | This function never returns NULL. */ | |
72 | ||
73 | static const char * | |
23a7fe75 | 74 | ftrace_print_filename (const struct btrace_function *bfun) |
02d27625 MM |
75 | { |
76 | struct symbol *sym; | |
77 | const char *filename; | |
78 | ||
79 | sym = bfun->sym; | |
80 | ||
81 | if (sym != NULL) | |
08be3fe3 | 82 | filename = symtab_to_filename_for_display (symbol_symtab (sym)); |
02d27625 MM |
83 | else |
84 | filename = "<unknown>"; | |
85 | ||
86 | return filename; | |
87 | } | |
88 | ||
23a7fe75 MM |
89 | /* Return a string representation of the address of an instruction. |
90 | This function never returns NULL. */ | |
02d27625 | 91 | |
23a7fe75 MM |
92 | static const char * |
93 | ftrace_print_insn_addr (const struct btrace_insn *insn) | |
02d27625 | 94 | { |
23a7fe75 MM |
95 | if (insn == NULL) |
96 | return "<nil>"; | |
97 | ||
98 | return core_addr_to_string_nz (insn->pc); | |
02d27625 MM |
99 | } |
100 | ||
23a7fe75 | 101 | /* Print an ftrace debug status message. */ |
02d27625 MM |
102 | |
103 | static void | |
23a7fe75 | 104 | ftrace_debug (const struct btrace_function *bfun, const char *prefix) |
02d27625 | 105 | { |
23a7fe75 MM |
106 | const char *fun, *file; |
107 | unsigned int ibegin, iend; | |
ce0dfbea | 108 | int level; |
23a7fe75 MM |
109 | |
110 | fun = ftrace_print_function_name (bfun); | |
111 | file = ftrace_print_filename (bfun); | |
112 | level = bfun->level; | |
113 | ||
23a7fe75 MM |
114 | ibegin = bfun->insn_offset; |
115 | iend = ibegin + VEC_length (btrace_insn_s, bfun->insn); | |
116 | ||
ce0dfbea MM |
117 | DEBUG_FTRACE ("%s: fun = %s, file = %s, level = %d, insn = [%u; %u)", |
118 | prefix, fun, file, level, ibegin, iend); | |
02d27625 MM |
119 | } |
120 | ||
23a7fe75 MM |
121 | /* Return non-zero if BFUN does not match MFUN and FUN, |
122 | return zero otherwise. */ | |
02d27625 MM |
123 | |
124 | static int | |
23a7fe75 MM |
125 | ftrace_function_switched (const struct btrace_function *bfun, |
126 | const struct minimal_symbol *mfun, | |
127 | const struct symbol *fun) | |
02d27625 MM |
128 | { |
129 | struct minimal_symbol *msym; | |
130 | struct symbol *sym; | |
131 | ||
02d27625 MM |
132 | msym = bfun->msym; |
133 | sym = bfun->sym; | |
134 | ||
135 | /* If the minimal symbol changed, we certainly switched functions. */ | |
136 | if (mfun != NULL && msym != NULL | |
efd66ac6 | 137 | && strcmp (MSYMBOL_LINKAGE_NAME (mfun), MSYMBOL_LINKAGE_NAME (msym)) != 0) |
02d27625 MM |
138 | return 1; |
139 | ||
140 | /* If the symbol changed, we certainly switched functions. */ | |
141 | if (fun != NULL && sym != NULL) | |
142 | { | |
143 | const char *bfname, *fname; | |
144 | ||
145 | /* Check the function name. */ | |
146 | if (strcmp (SYMBOL_LINKAGE_NAME (fun), SYMBOL_LINKAGE_NAME (sym)) != 0) | |
147 | return 1; | |
148 | ||
149 | /* Check the location of those functions, as well. */ | |
08be3fe3 DE |
150 | bfname = symtab_to_fullname (symbol_symtab (sym)); |
151 | fname = symtab_to_fullname (symbol_symtab (fun)); | |
02d27625 MM |
152 | if (filename_cmp (fname, bfname) != 0) |
153 | return 1; | |
154 | } | |
155 | ||
23a7fe75 MM |
156 | /* If we lost symbol information, we switched functions. */ |
157 | if (!(msym == NULL && sym == NULL) && mfun == NULL && fun == NULL) | |
158 | return 1; | |
159 | ||
160 | /* If we gained symbol information, we switched functions. */ | |
161 | if (msym == NULL && sym == NULL && !(mfun == NULL && fun == NULL)) | |
162 | return 1; | |
163 | ||
02d27625 MM |
164 | return 0; |
165 | } | |
166 | ||
23a7fe75 MM |
167 | /* Allocate and initialize a new branch trace function segment. |
168 | PREV is the chronologically preceding function segment. | |
169 | MFUN and FUN are the symbol information we have for this function. */ | |
170 | ||
171 | static struct btrace_function * | |
172 | ftrace_new_function (struct btrace_function *prev, | |
173 | struct minimal_symbol *mfun, | |
174 | struct symbol *fun) | |
175 | { | |
176 | struct btrace_function *bfun; | |
177 | ||
178 | bfun = xzalloc (sizeof (*bfun)); | |
179 | ||
180 | bfun->msym = mfun; | |
181 | bfun->sym = fun; | |
182 | bfun->flow.prev = prev; | |
183 | ||
5de9129b MM |
184 | if (prev == NULL) |
185 | { | |
186 | /* Start counting at one. */ | |
187 | bfun->number = 1; | |
188 | bfun->insn_offset = 1; | |
189 | } | |
190 | else | |
23a7fe75 MM |
191 | { |
192 | gdb_assert (prev->flow.next == NULL); | |
193 | prev->flow.next = bfun; | |
02d27625 | 194 | |
23a7fe75 MM |
195 | bfun->number = prev->number + 1; |
196 | bfun->insn_offset = (prev->insn_offset | |
197 | + VEC_length (btrace_insn_s, prev->insn)); | |
31fd9caa | 198 | bfun->level = prev->level; |
23a7fe75 MM |
199 | } |
200 | ||
201 | return bfun; | |
02d27625 MM |
202 | } |
203 | ||
23a7fe75 | 204 | /* Update the UP field of a function segment. */ |
02d27625 | 205 | |
23a7fe75 MM |
206 | static void |
207 | ftrace_update_caller (struct btrace_function *bfun, | |
208 | struct btrace_function *caller, | |
209 | enum btrace_function_flag flags) | |
02d27625 | 210 | { |
23a7fe75 MM |
211 | if (bfun->up != NULL) |
212 | ftrace_debug (bfun, "updating caller"); | |
02d27625 | 213 | |
23a7fe75 MM |
214 | bfun->up = caller; |
215 | bfun->flags = flags; | |
216 | ||
217 | ftrace_debug (bfun, "set caller"); | |
218 | } | |
219 | ||
220 | /* Fix up the caller for all segments of a function. */ | |
221 | ||
222 | static void | |
223 | ftrace_fixup_caller (struct btrace_function *bfun, | |
224 | struct btrace_function *caller, | |
225 | enum btrace_function_flag flags) | |
226 | { | |
227 | struct btrace_function *prev, *next; | |
228 | ||
229 | ftrace_update_caller (bfun, caller, flags); | |
230 | ||
231 | /* Update all function segments belonging to the same function. */ | |
232 | for (prev = bfun->segment.prev; prev != NULL; prev = prev->segment.prev) | |
233 | ftrace_update_caller (prev, caller, flags); | |
234 | ||
235 | for (next = bfun->segment.next; next != NULL; next = next->segment.next) | |
236 | ftrace_update_caller (next, caller, flags); | |
237 | } | |
238 | ||
239 | /* Add a new function segment for a call. | |
240 | CALLER is the chronologically preceding function segment. | |
241 | MFUN and FUN are the symbol information we have for this function. */ | |
242 | ||
243 | static struct btrace_function * | |
244 | ftrace_new_call (struct btrace_function *caller, | |
245 | struct minimal_symbol *mfun, | |
246 | struct symbol *fun) | |
247 | { | |
248 | struct btrace_function *bfun; | |
249 | ||
250 | bfun = ftrace_new_function (caller, mfun, fun); | |
251 | bfun->up = caller; | |
31fd9caa | 252 | bfun->level += 1; |
23a7fe75 MM |
253 | |
254 | ftrace_debug (bfun, "new call"); | |
255 | ||
256 | return bfun; | |
257 | } | |
258 | ||
259 | /* Add a new function segment for a tail call. | |
260 | CALLER is the chronologically preceding function segment. | |
261 | MFUN and FUN are the symbol information we have for this function. */ | |
262 | ||
263 | static struct btrace_function * | |
264 | ftrace_new_tailcall (struct btrace_function *caller, | |
265 | struct minimal_symbol *mfun, | |
266 | struct symbol *fun) | |
267 | { | |
268 | struct btrace_function *bfun; | |
02d27625 | 269 | |
23a7fe75 MM |
270 | bfun = ftrace_new_function (caller, mfun, fun); |
271 | bfun->up = caller; | |
31fd9caa | 272 | bfun->level += 1; |
23a7fe75 | 273 | bfun->flags |= BFUN_UP_LINKS_TO_TAILCALL; |
02d27625 | 274 | |
23a7fe75 MM |
275 | ftrace_debug (bfun, "new tail call"); |
276 | ||
277 | return bfun; | |
278 | } | |
279 | ||
280 | /* Find the innermost caller in the back trace of BFUN with MFUN/FUN | |
281 | symbol information. */ | |
282 | ||
283 | static struct btrace_function * | |
284 | ftrace_find_caller (struct btrace_function *bfun, | |
285 | struct minimal_symbol *mfun, | |
286 | struct symbol *fun) | |
287 | { | |
288 | for (; bfun != NULL; bfun = bfun->up) | |
289 | { | |
290 | /* Skip functions with incompatible symbol information. */ | |
291 | if (ftrace_function_switched (bfun, mfun, fun)) | |
292 | continue; | |
293 | ||
294 | /* This is the function segment we're looking for. */ | |
295 | break; | |
296 | } | |
297 | ||
298 | return bfun; | |
299 | } | |
300 | ||
301 | /* Find the innermost caller in the back trace of BFUN, skipping all | |
302 | function segments that do not end with a call instruction (e.g. | |
303 | tail calls ending with a jump). */ | |
304 | ||
305 | static struct btrace_function * | |
7d5c24b3 | 306 | ftrace_find_call (struct btrace_function *bfun) |
23a7fe75 MM |
307 | { |
308 | for (; bfun != NULL; bfun = bfun->up) | |
02d27625 | 309 | { |
23a7fe75 | 310 | struct btrace_insn *last; |
02d27625 | 311 | |
31fd9caa MM |
312 | /* Skip gaps. */ |
313 | if (bfun->errcode != 0) | |
314 | continue; | |
23a7fe75 MM |
315 | |
316 | last = VEC_last (btrace_insn_s, bfun->insn); | |
02d27625 | 317 | |
7d5c24b3 | 318 | if (last->iclass == BTRACE_INSN_CALL) |
23a7fe75 MM |
319 | break; |
320 | } | |
321 | ||
322 | return bfun; | |
323 | } | |
324 | ||
325 | /* Add a continuation segment for a function into which we return. | |
326 | PREV is the chronologically preceding function segment. | |
327 | MFUN and FUN are the symbol information we have for this function. */ | |
328 | ||
329 | static struct btrace_function * | |
7d5c24b3 | 330 | ftrace_new_return (struct btrace_function *prev, |
23a7fe75 MM |
331 | struct minimal_symbol *mfun, |
332 | struct symbol *fun) | |
333 | { | |
334 | struct btrace_function *bfun, *caller; | |
335 | ||
336 | bfun = ftrace_new_function (prev, mfun, fun); | |
337 | ||
338 | /* It is important to start at PREV's caller. Otherwise, we might find | |
339 | PREV itself, if PREV is a recursive function. */ | |
340 | caller = ftrace_find_caller (prev->up, mfun, fun); | |
341 | if (caller != NULL) | |
342 | { | |
343 | /* The caller of PREV is the preceding btrace function segment in this | |
344 | function instance. */ | |
345 | gdb_assert (caller->segment.next == NULL); | |
346 | ||
347 | caller->segment.next = bfun; | |
348 | bfun->segment.prev = caller; | |
349 | ||
350 | /* Maintain the function level. */ | |
351 | bfun->level = caller->level; | |
352 | ||
353 | /* Maintain the call stack. */ | |
354 | bfun->up = caller->up; | |
355 | bfun->flags = caller->flags; | |
356 | ||
357 | ftrace_debug (bfun, "new return"); | |
358 | } | |
359 | else | |
360 | { | |
361 | /* We did not find a caller. This could mean that something went | |
362 | wrong or that the call is simply not included in the trace. */ | |
02d27625 | 363 | |
23a7fe75 | 364 | /* Let's search for some actual call. */ |
7d5c24b3 | 365 | caller = ftrace_find_call (prev->up); |
23a7fe75 | 366 | if (caller == NULL) |
02d27625 | 367 | { |
23a7fe75 MM |
368 | /* There is no call in PREV's back trace. We assume that the |
369 | branch trace did not include it. */ | |
370 | ||
371 | /* Let's find the topmost call function - this skips tail calls. */ | |
372 | while (prev->up != NULL) | |
373 | prev = prev->up; | |
02d27625 | 374 | |
23a7fe75 MM |
375 | /* We maintain levels for a series of returns for which we have |
376 | not seen the calls. | |
377 | We start at the preceding function's level in case this has | |
378 | already been a return for which we have not seen the call. | |
379 | We start at level 0 otherwise, to handle tail calls correctly. */ | |
380 | bfun->level = min (0, prev->level) - 1; | |
381 | ||
382 | /* Fix up the call stack for PREV. */ | |
383 | ftrace_fixup_caller (prev, bfun, BFUN_UP_LINKS_TO_RET); | |
384 | ||
385 | ftrace_debug (bfun, "new return - no caller"); | |
386 | } | |
387 | else | |
02d27625 | 388 | { |
23a7fe75 MM |
389 | /* There is a call in PREV's back trace to which we should have |
390 | returned. Let's remain at this level. */ | |
391 | bfun->level = prev->level; | |
02d27625 | 392 | |
23a7fe75 | 393 | ftrace_debug (bfun, "new return - unknown caller"); |
02d27625 | 394 | } |
23a7fe75 MM |
395 | } |
396 | ||
397 | return bfun; | |
398 | } | |
399 | ||
400 | /* Add a new function segment for a function switch. | |
401 | PREV is the chronologically preceding function segment. | |
402 | MFUN and FUN are the symbol information we have for this function. */ | |
403 | ||
404 | static struct btrace_function * | |
405 | ftrace_new_switch (struct btrace_function *prev, | |
406 | struct minimal_symbol *mfun, | |
407 | struct symbol *fun) | |
408 | { | |
409 | struct btrace_function *bfun; | |
410 | ||
411 | /* This is an unexplained function switch. The call stack will likely | |
412 | be wrong at this point. */ | |
413 | bfun = ftrace_new_function (prev, mfun, fun); | |
02d27625 | 414 | |
23a7fe75 MM |
415 | ftrace_debug (bfun, "new switch"); |
416 | ||
417 | return bfun; | |
418 | } | |
419 | ||
31fd9caa MM |
420 | /* Add a new function segment for a gap in the trace due to a decode error. |
421 | PREV is the chronologically preceding function segment. | |
422 | ERRCODE is the format-specific error code. */ | |
423 | ||
424 | static struct btrace_function * | |
425 | ftrace_new_gap (struct btrace_function *prev, int errcode) | |
426 | { | |
427 | struct btrace_function *bfun; | |
428 | ||
429 | /* We hijack prev if it was empty. */ | |
430 | if (prev != NULL && prev->errcode == 0 | |
431 | && VEC_empty (btrace_insn_s, prev->insn)) | |
432 | bfun = prev; | |
433 | else | |
434 | bfun = ftrace_new_function (prev, NULL, NULL); | |
435 | ||
436 | bfun->errcode = errcode; | |
437 | ||
438 | ftrace_debug (bfun, "new gap"); | |
439 | ||
440 | return bfun; | |
441 | } | |
442 | ||
23a7fe75 MM |
443 | /* Update BFUN with respect to the instruction at PC. This may create new |
444 | function segments. | |
445 | Return the chronologically latest function segment, never NULL. */ | |
446 | ||
447 | static struct btrace_function * | |
7d5c24b3 | 448 | ftrace_update_function (struct btrace_function *bfun, CORE_ADDR pc) |
23a7fe75 MM |
449 | { |
450 | struct bound_minimal_symbol bmfun; | |
451 | struct minimal_symbol *mfun; | |
452 | struct symbol *fun; | |
453 | struct btrace_insn *last; | |
454 | ||
455 | /* Try to determine the function we're in. We use both types of symbols | |
456 | to avoid surprises when we sometimes get a full symbol and sometimes | |
457 | only a minimal symbol. */ | |
458 | fun = find_pc_function (pc); | |
459 | bmfun = lookup_minimal_symbol_by_pc (pc); | |
460 | mfun = bmfun.minsym; | |
461 | ||
462 | if (fun == NULL && mfun == NULL) | |
463 | DEBUG_FTRACE ("no symbol at %s", core_addr_to_string_nz (pc)); | |
464 | ||
31fd9caa MM |
465 | /* If we didn't have a function or if we had a gap before, we create one. */ |
466 | if (bfun == NULL || bfun->errcode != 0) | |
23a7fe75 MM |
467 | return ftrace_new_function (bfun, mfun, fun); |
468 | ||
469 | /* Check the last instruction, if we have one. | |
470 | We do this check first, since it allows us to fill in the call stack | |
471 | links in addition to the normal flow links. */ | |
472 | last = NULL; | |
473 | if (!VEC_empty (btrace_insn_s, bfun->insn)) | |
474 | last = VEC_last (btrace_insn_s, bfun->insn); | |
475 | ||
476 | if (last != NULL) | |
477 | { | |
7d5c24b3 MM |
478 | switch (last->iclass) |
479 | { | |
480 | case BTRACE_INSN_RETURN: | |
986b6601 MM |
481 | { |
482 | const char *fname; | |
483 | ||
484 | /* On some systems, _dl_runtime_resolve returns to the resolved | |
485 | function instead of jumping to it. From our perspective, | |
486 | however, this is a tailcall. | |
487 | If we treated it as return, we wouldn't be able to find the | |
488 | resolved function in our stack back trace. Hence, we would | |
489 | lose the current stack back trace and start anew with an empty | |
490 | back trace. When the resolved function returns, we would then | |
491 | create a stack back trace with the same function names but | |
492 | different frame id's. This will confuse stepping. */ | |
493 | fname = ftrace_print_function_name (bfun); | |
494 | if (strcmp (fname, "_dl_runtime_resolve") == 0) | |
495 | return ftrace_new_tailcall (bfun, mfun, fun); | |
496 | ||
497 | return ftrace_new_return (bfun, mfun, fun); | |
498 | } | |
23a7fe75 | 499 | |
7d5c24b3 MM |
500 | case BTRACE_INSN_CALL: |
501 | /* Ignore calls to the next instruction. They are used for PIC. */ | |
502 | if (last->pc + last->size == pc) | |
503 | break; | |
23a7fe75 | 504 | |
7d5c24b3 | 505 | return ftrace_new_call (bfun, mfun, fun); |
23a7fe75 | 506 | |
7d5c24b3 MM |
507 | case BTRACE_INSN_JUMP: |
508 | { | |
509 | CORE_ADDR start; | |
23a7fe75 | 510 | |
7d5c24b3 | 511 | start = get_pc_function_start (pc); |
23a7fe75 | 512 | |
7d5c24b3 MM |
513 | /* If we can't determine the function for PC, we treat a jump at |
514 | the end of the block as tail call. */ | |
515 | if (start == 0 || start == pc) | |
516 | return ftrace_new_tailcall (bfun, mfun, fun); | |
517 | } | |
02d27625 | 518 | } |
23a7fe75 MM |
519 | } |
520 | ||
521 | /* Check if we're switching functions for some other reason. */ | |
522 | if (ftrace_function_switched (bfun, mfun, fun)) | |
523 | { | |
524 | DEBUG_FTRACE ("switching from %s in %s at %s", | |
525 | ftrace_print_insn_addr (last), | |
526 | ftrace_print_function_name (bfun), | |
527 | ftrace_print_filename (bfun)); | |
02d27625 | 528 | |
23a7fe75 MM |
529 | return ftrace_new_switch (bfun, mfun, fun); |
530 | } | |
531 | ||
532 | return bfun; | |
533 | } | |
534 | ||
23a7fe75 MM |
535 | /* Add the instruction at PC to BFUN's instructions. */ |
536 | ||
537 | static void | |
7d5c24b3 MM |
538 | ftrace_update_insns (struct btrace_function *bfun, |
539 | const struct btrace_insn *insn) | |
23a7fe75 | 540 | { |
7d5c24b3 | 541 | VEC_safe_push (btrace_insn_s, bfun->insn, insn); |
23a7fe75 MM |
542 | |
543 | if (record_debug > 1) | |
544 | ftrace_debug (bfun, "update insn"); | |
545 | } | |
546 | ||
7d5c24b3 MM |
547 | /* Classify the instruction at PC. */ |
548 | ||
549 | static enum btrace_insn_class | |
550 | ftrace_classify_insn (struct gdbarch *gdbarch, CORE_ADDR pc) | |
551 | { | |
552 | volatile struct gdb_exception error; | |
553 | enum btrace_insn_class iclass; | |
554 | ||
555 | iclass = BTRACE_INSN_OTHER; | |
556 | TRY_CATCH (error, RETURN_MASK_ERROR) | |
557 | { | |
558 | if (gdbarch_insn_is_call (gdbarch, pc)) | |
559 | iclass = BTRACE_INSN_CALL; | |
560 | else if (gdbarch_insn_is_ret (gdbarch, pc)) | |
561 | iclass = BTRACE_INSN_RETURN; | |
562 | else if (gdbarch_insn_is_jump (gdbarch, pc)) | |
563 | iclass = BTRACE_INSN_JUMP; | |
564 | } | |
565 | ||
566 | return iclass; | |
567 | } | |
568 | ||
734b0e4b | 569 | /* Compute the function branch trace from BTS trace. */ |
23a7fe75 MM |
570 | |
571 | static void | |
76235df1 | 572 | btrace_compute_ftrace_bts (struct thread_info *tp, |
734b0e4b | 573 | const struct btrace_data_bts *btrace) |
23a7fe75 | 574 | { |
76235df1 | 575 | struct btrace_thread_info *btinfo; |
23a7fe75 MM |
576 | struct btrace_function *begin, *end; |
577 | struct gdbarch *gdbarch; | |
31fd9caa | 578 | unsigned int blk, ngaps; |
23a7fe75 MM |
579 | int level; |
580 | ||
23a7fe75 | 581 | gdbarch = target_gdbarch (); |
76235df1 | 582 | btinfo = &tp->btrace; |
969c39fb MM |
583 | begin = btinfo->begin; |
584 | end = btinfo->end; | |
31fd9caa | 585 | ngaps = btinfo->ngaps; |
969c39fb | 586 | level = begin != NULL ? -btinfo->level : INT_MAX; |
734b0e4b | 587 | blk = VEC_length (btrace_block_s, btrace->blocks); |
23a7fe75 MM |
588 | |
589 | while (blk != 0) | |
590 | { | |
591 | btrace_block_s *block; | |
592 | CORE_ADDR pc; | |
593 | ||
594 | blk -= 1; | |
595 | ||
734b0e4b | 596 | block = VEC_index (btrace_block_s, btrace->blocks, blk); |
23a7fe75 MM |
597 | pc = block->begin; |
598 | ||
599 | for (;;) | |
600 | { | |
7d5c24b3 MM |
601 | volatile struct gdb_exception error; |
602 | struct btrace_insn insn; | |
23a7fe75 MM |
603 | int size; |
604 | ||
605 | /* We should hit the end of the block. Warn if we went too far. */ | |
606 | if (block->end < pc) | |
607 | { | |
31fd9caa MM |
608 | /* Indicate the gap in the trace - unless we're at the |
609 | beginning. */ | |
610 | if (begin != NULL) | |
611 | { | |
612 | warning (_("Recorded trace may be corrupted around %s."), | |
613 | core_addr_to_string_nz (pc)); | |
614 | ||
615 | end = ftrace_new_gap (end, BDE_BTS_OVERFLOW); | |
616 | ngaps += 1; | |
617 | } | |
23a7fe75 MM |
618 | break; |
619 | } | |
620 | ||
7d5c24b3 | 621 | end = ftrace_update_function (end, pc); |
23a7fe75 MM |
622 | if (begin == NULL) |
623 | begin = end; | |
624 | ||
8710b709 MM |
625 | /* Maintain the function level offset. |
626 | For all but the last block, we do it here. */ | |
627 | if (blk != 0) | |
628 | level = min (level, end->level); | |
23a7fe75 | 629 | |
7d5c24b3 MM |
630 | size = 0; |
631 | TRY_CATCH (error, RETURN_MASK_ERROR) | |
632 | size = gdb_insn_length (gdbarch, pc); | |
633 | ||
634 | insn.pc = pc; | |
635 | insn.size = size; | |
636 | insn.iclass = ftrace_classify_insn (gdbarch, pc); | |
637 | ||
638 | ftrace_update_insns (end, &insn); | |
23a7fe75 MM |
639 | |
640 | /* We're done once we pushed the instruction at the end. */ | |
641 | if (block->end == pc) | |
642 | break; | |
643 | ||
7d5c24b3 | 644 | /* We can't continue if we fail to compute the size. */ |
23a7fe75 MM |
645 | if (size <= 0) |
646 | { | |
647 | warning (_("Recorded trace may be incomplete around %s."), | |
648 | core_addr_to_string_nz (pc)); | |
31fd9caa MM |
649 | |
650 | /* Indicate the gap in the trace. We just added INSN so we're | |
651 | not at the beginning. */ | |
652 | end = ftrace_new_gap (end, BDE_BTS_INSN_SIZE); | |
653 | ngaps += 1; | |
654 | ||
23a7fe75 MM |
655 | break; |
656 | } | |
657 | ||
658 | pc += size; | |
8710b709 MM |
659 | |
660 | /* Maintain the function level offset. | |
661 | For the last block, we do it here to not consider the last | |
662 | instruction. | |
663 | Since the last instruction corresponds to the current instruction | |
664 | and is not really part of the execution history, it shouldn't | |
665 | affect the level. */ | |
666 | if (blk == 0) | |
667 | level = min (level, end->level); | |
23a7fe75 | 668 | } |
02d27625 MM |
669 | } |
670 | ||
23a7fe75 MM |
671 | btinfo->begin = begin; |
672 | btinfo->end = end; | |
31fd9caa | 673 | btinfo->ngaps = ngaps; |
23a7fe75 MM |
674 | |
675 | /* LEVEL is the minimal function level of all btrace function segments. | |
676 | Define the global level offset to -LEVEL so all function levels are | |
677 | normalized to start at zero. */ | |
678 | btinfo->level = -level; | |
02d27625 MM |
679 | } |
680 | ||
734b0e4b MM |
681 | /* Compute the function branch trace from a block branch trace BTRACE for |
682 | a thread given by BTINFO. */ | |
683 | ||
684 | static void | |
76235df1 | 685 | btrace_compute_ftrace (struct thread_info *tp, struct btrace_data *btrace) |
734b0e4b MM |
686 | { |
687 | DEBUG ("compute ftrace"); | |
688 | ||
689 | switch (btrace->format) | |
690 | { | |
691 | case BTRACE_FORMAT_NONE: | |
692 | return; | |
693 | ||
694 | case BTRACE_FORMAT_BTS: | |
76235df1 | 695 | btrace_compute_ftrace_bts (tp, &btrace->variant.bts); |
734b0e4b MM |
696 | return; |
697 | } | |
698 | ||
699 | internal_error (__FILE__, __LINE__, _("Unkown branch trace format.")); | |
700 | } | |
701 | ||
6e07b1d2 MM |
702 | /* Add an entry for the current PC. */ |
703 | ||
704 | static void | |
705 | btrace_add_pc (struct thread_info *tp) | |
706 | { | |
734b0e4b | 707 | struct btrace_data btrace; |
6e07b1d2 MM |
708 | struct btrace_block *block; |
709 | struct regcache *regcache; | |
710 | struct cleanup *cleanup; | |
711 | CORE_ADDR pc; | |
712 | ||
713 | regcache = get_thread_regcache (tp->ptid); | |
714 | pc = regcache_read_pc (regcache); | |
715 | ||
734b0e4b MM |
716 | btrace_data_init (&btrace); |
717 | btrace.format = BTRACE_FORMAT_BTS; | |
718 | btrace.variant.bts.blocks = NULL; | |
6e07b1d2 | 719 | |
734b0e4b MM |
720 | cleanup = make_cleanup_btrace_data (&btrace); |
721 | ||
722 | block = VEC_safe_push (btrace_block_s, btrace.variant.bts.blocks, NULL); | |
6e07b1d2 MM |
723 | block->begin = pc; |
724 | block->end = pc; | |
725 | ||
76235df1 | 726 | btrace_compute_ftrace (tp, &btrace); |
6e07b1d2 MM |
727 | |
728 | do_cleanups (cleanup); | |
729 | } | |
730 | ||
02d27625 MM |
731 | /* See btrace.h. */ |
732 | ||
733 | void | |
f4abbc16 | 734 | btrace_enable (struct thread_info *tp, const struct btrace_config *conf) |
02d27625 MM |
735 | { |
736 | if (tp->btrace.target != NULL) | |
737 | return; | |
738 | ||
f4abbc16 | 739 | if (!target_supports_btrace (conf->format)) |
02d27625 MM |
740 | error (_("Target does not support branch tracing.")); |
741 | ||
742 | DEBUG ("enable thread %d (%s)", tp->num, target_pid_to_str (tp->ptid)); | |
743 | ||
f4abbc16 | 744 | tp->btrace.target = target_enable_btrace (tp->ptid, conf); |
6e07b1d2 MM |
745 | |
746 | /* Add an entry for the current PC so we start tracing from where we | |
747 | enabled it. */ | |
748 | if (tp->btrace.target != NULL) | |
749 | btrace_add_pc (tp); | |
02d27625 MM |
750 | } |
751 | ||
752 | /* See btrace.h. */ | |
753 | ||
f4abbc16 MM |
754 | const struct btrace_config * |
755 | btrace_conf (const struct btrace_thread_info *btinfo) | |
756 | { | |
757 | if (btinfo->target == NULL) | |
758 | return NULL; | |
759 | ||
760 | return target_btrace_conf (btinfo->target); | |
761 | } | |
762 | ||
763 | /* See btrace.h. */ | |
764 | ||
02d27625 MM |
765 | void |
766 | btrace_disable (struct thread_info *tp) | |
767 | { | |
768 | struct btrace_thread_info *btp = &tp->btrace; | |
769 | int errcode = 0; | |
770 | ||
771 | if (btp->target == NULL) | |
772 | return; | |
773 | ||
774 | DEBUG ("disable thread %d (%s)", tp->num, target_pid_to_str (tp->ptid)); | |
775 | ||
776 | target_disable_btrace (btp->target); | |
777 | btp->target = NULL; | |
778 | ||
779 | btrace_clear (tp); | |
780 | } | |
781 | ||
782 | /* See btrace.h. */ | |
783 | ||
784 | void | |
785 | btrace_teardown (struct thread_info *tp) | |
786 | { | |
787 | struct btrace_thread_info *btp = &tp->btrace; | |
788 | int errcode = 0; | |
789 | ||
790 | if (btp->target == NULL) | |
791 | return; | |
792 | ||
793 | DEBUG ("teardown thread %d (%s)", tp->num, target_pid_to_str (tp->ptid)); | |
794 | ||
795 | target_teardown_btrace (btp->target); | |
796 | btp->target = NULL; | |
797 | ||
798 | btrace_clear (tp); | |
799 | } | |
800 | ||
734b0e4b | 801 | /* Stitch branch trace in BTS format. */ |
969c39fb MM |
802 | |
803 | static int | |
31fd9caa | 804 | btrace_stitch_bts (struct btrace_data_bts *btrace, struct thread_info *tp) |
969c39fb | 805 | { |
31fd9caa | 806 | struct btrace_thread_info *btinfo; |
969c39fb MM |
807 | struct btrace_function *last_bfun; |
808 | struct btrace_insn *last_insn; | |
809 | btrace_block_s *first_new_block; | |
810 | ||
31fd9caa | 811 | btinfo = &tp->btrace; |
969c39fb MM |
812 | last_bfun = btinfo->end; |
813 | gdb_assert (last_bfun != NULL); | |
31fd9caa MM |
814 | gdb_assert (!VEC_empty (btrace_block_s, btrace->blocks)); |
815 | ||
816 | /* If the existing trace ends with a gap, we just glue the traces | |
817 | together. We need to drop the last (i.e. chronologically first) block | |
818 | of the new trace, though, since we can't fill in the start address.*/ | |
819 | if (VEC_empty (btrace_insn_s, last_bfun->insn)) | |
820 | { | |
821 | VEC_pop (btrace_block_s, btrace->blocks); | |
822 | return 0; | |
823 | } | |
969c39fb MM |
824 | |
825 | /* Beware that block trace starts with the most recent block, so the | |
826 | chronologically first block in the new trace is the last block in | |
827 | the new trace's block vector. */ | |
734b0e4b | 828 | first_new_block = VEC_last (btrace_block_s, btrace->blocks); |
969c39fb MM |
829 | last_insn = VEC_last (btrace_insn_s, last_bfun->insn); |
830 | ||
831 | /* If the current PC at the end of the block is the same as in our current | |
832 | trace, there are two explanations: | |
833 | 1. we executed the instruction and some branch brought us back. | |
834 | 2. we have not made any progress. | |
835 | In the first case, the delta trace vector should contain at least two | |
836 | entries. | |
837 | In the second case, the delta trace vector should contain exactly one | |
838 | entry for the partial block containing the current PC. Remove it. */ | |
839 | if (first_new_block->end == last_insn->pc | |
734b0e4b | 840 | && VEC_length (btrace_block_s, btrace->blocks) == 1) |
969c39fb | 841 | { |
734b0e4b | 842 | VEC_pop (btrace_block_s, btrace->blocks); |
969c39fb MM |
843 | return 0; |
844 | } | |
845 | ||
846 | DEBUG ("stitching %s to %s", ftrace_print_insn_addr (last_insn), | |
847 | core_addr_to_string_nz (first_new_block->end)); | |
848 | ||
849 | /* Do a simple sanity check to make sure we don't accidentally end up | |
850 | with a bad block. This should not occur in practice. */ | |
851 | if (first_new_block->end < last_insn->pc) | |
852 | { | |
853 | warning (_("Error while trying to read delta trace. Falling back to " | |
854 | "a full read.")); | |
855 | return -1; | |
856 | } | |
857 | ||
858 | /* We adjust the last block to start at the end of our current trace. */ | |
859 | gdb_assert (first_new_block->begin == 0); | |
860 | first_new_block->begin = last_insn->pc; | |
861 | ||
862 | /* We simply pop the last insn so we can insert it again as part of | |
863 | the normal branch trace computation. | |
864 | Since instruction iterators are based on indices in the instructions | |
865 | vector, we don't leave any pointers dangling. */ | |
866 | DEBUG ("pruning insn at %s for stitching", | |
867 | ftrace_print_insn_addr (last_insn)); | |
868 | ||
869 | VEC_pop (btrace_insn_s, last_bfun->insn); | |
870 | ||
871 | /* The instructions vector may become empty temporarily if this has | |
872 | been the only instruction in this function segment. | |
873 | This violates the invariant but will be remedied shortly by | |
874 | btrace_compute_ftrace when we add the new trace. */ | |
31fd9caa MM |
875 | |
876 | /* The only case where this would hurt is if the entire trace consisted | |
877 | of just that one instruction. If we remove it, we might turn the now | |
878 | empty btrace function segment into a gap. But we don't want gaps at | |
879 | the beginning. To avoid this, we remove the entire old trace. */ | |
880 | if (last_bfun == btinfo->begin && VEC_empty (btrace_insn_s, last_bfun->insn)) | |
881 | btrace_clear (tp); | |
882 | ||
969c39fb MM |
883 | return 0; |
884 | } | |
885 | ||
734b0e4b MM |
886 | /* Adjust the block trace in order to stitch old and new trace together. |
887 | BTRACE is the new delta trace between the last and the current stop. | |
31fd9caa MM |
888 | TP is the traced thread. |
889 | May modifx BTRACE as well as the existing trace in TP. | |
734b0e4b MM |
890 | Return 0 on success, -1 otherwise. */ |
891 | ||
892 | static int | |
31fd9caa | 893 | btrace_stitch_trace (struct btrace_data *btrace, struct thread_info *tp) |
734b0e4b MM |
894 | { |
895 | /* If we don't have trace, there's nothing to do. */ | |
896 | if (btrace_data_empty (btrace)) | |
897 | return 0; | |
898 | ||
899 | switch (btrace->format) | |
900 | { | |
901 | case BTRACE_FORMAT_NONE: | |
902 | return 0; | |
903 | ||
904 | case BTRACE_FORMAT_BTS: | |
31fd9caa | 905 | return btrace_stitch_bts (&btrace->variant.bts, tp); |
734b0e4b MM |
906 | } |
907 | ||
908 | internal_error (__FILE__, __LINE__, _("Unkown branch trace format.")); | |
909 | } | |
910 | ||
969c39fb MM |
911 | /* Clear the branch trace histories in BTINFO. */ |
912 | ||
913 | static void | |
914 | btrace_clear_history (struct btrace_thread_info *btinfo) | |
915 | { | |
916 | xfree (btinfo->insn_history); | |
917 | xfree (btinfo->call_history); | |
918 | xfree (btinfo->replay); | |
919 | ||
920 | btinfo->insn_history = NULL; | |
921 | btinfo->call_history = NULL; | |
922 | btinfo->replay = NULL; | |
923 | } | |
924 | ||
02d27625 MM |
925 | /* See btrace.h. */ |
926 | ||
927 | void | |
928 | btrace_fetch (struct thread_info *tp) | |
929 | { | |
930 | struct btrace_thread_info *btinfo; | |
969c39fb | 931 | struct btrace_target_info *tinfo; |
734b0e4b | 932 | struct btrace_data btrace; |
23a7fe75 | 933 | struct cleanup *cleanup; |
969c39fb | 934 | int errcode; |
02d27625 MM |
935 | |
936 | DEBUG ("fetch thread %d (%s)", tp->num, target_pid_to_str (tp->ptid)); | |
937 | ||
938 | btinfo = &tp->btrace; | |
969c39fb MM |
939 | tinfo = btinfo->target; |
940 | if (tinfo == NULL) | |
941 | return; | |
942 | ||
943 | /* There's no way we could get new trace while replaying. | |
944 | On the other hand, delta trace would return a partial record with the | |
945 | current PC, which is the replay PC, not the last PC, as expected. */ | |
946 | if (btinfo->replay != NULL) | |
02d27625 MM |
947 | return; |
948 | ||
734b0e4b MM |
949 | btrace_data_init (&btrace); |
950 | cleanup = make_cleanup_btrace_data (&btrace); | |
02d27625 | 951 | |
969c39fb MM |
952 | /* Let's first try to extend the trace we already have. */ |
953 | if (btinfo->end != NULL) | |
954 | { | |
955 | errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_DELTA); | |
956 | if (errcode == 0) | |
957 | { | |
958 | /* Success. Let's try to stitch the traces together. */ | |
31fd9caa | 959 | errcode = btrace_stitch_trace (&btrace, tp); |
969c39fb MM |
960 | } |
961 | else | |
962 | { | |
963 | /* We failed to read delta trace. Let's try to read new trace. */ | |
964 | errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_NEW); | |
965 | ||
966 | /* If we got any new trace, discard what we have. */ | |
734b0e4b | 967 | if (errcode == 0 && !btrace_data_empty (&btrace)) |
969c39fb MM |
968 | btrace_clear (tp); |
969 | } | |
970 | ||
971 | /* If we were not able to read the trace, we start over. */ | |
972 | if (errcode != 0) | |
973 | { | |
974 | btrace_clear (tp); | |
975 | errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_ALL); | |
976 | } | |
977 | } | |
978 | else | |
979 | errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_ALL); | |
980 | ||
981 | /* If we were not able to read the branch trace, signal an error. */ | |
982 | if (errcode != 0) | |
983 | error (_("Failed to read branch trace.")); | |
984 | ||
985 | /* Compute the trace, provided we have any. */ | |
734b0e4b | 986 | if (!btrace_data_empty (&btrace)) |
23a7fe75 | 987 | { |
969c39fb | 988 | btrace_clear_history (btinfo); |
76235df1 | 989 | btrace_compute_ftrace (tp, &btrace); |
23a7fe75 | 990 | } |
02d27625 | 991 | |
23a7fe75 | 992 | do_cleanups (cleanup); |
02d27625 MM |
993 | } |
994 | ||
995 | /* See btrace.h. */ | |
996 | ||
997 | void | |
998 | btrace_clear (struct thread_info *tp) | |
999 | { | |
1000 | struct btrace_thread_info *btinfo; | |
23a7fe75 | 1001 | struct btrace_function *it, *trash; |
02d27625 MM |
1002 | |
1003 | DEBUG ("clear thread %d (%s)", tp->num, target_pid_to_str (tp->ptid)); | |
1004 | ||
0b722aec MM |
1005 | /* Make sure btrace frames that may hold a pointer into the branch |
1006 | trace data are destroyed. */ | |
1007 | reinit_frame_cache (); | |
1008 | ||
02d27625 MM |
1009 | btinfo = &tp->btrace; |
1010 | ||
23a7fe75 MM |
1011 | it = btinfo->begin; |
1012 | while (it != NULL) | |
1013 | { | |
1014 | trash = it; | |
1015 | it = it->flow.next; | |
02d27625 | 1016 | |
23a7fe75 MM |
1017 | xfree (trash); |
1018 | } | |
1019 | ||
1020 | btinfo->begin = NULL; | |
1021 | btinfo->end = NULL; | |
31fd9caa | 1022 | btinfo->ngaps = 0; |
23a7fe75 | 1023 | |
969c39fb | 1024 | btrace_clear_history (btinfo); |
02d27625 MM |
1025 | } |
1026 | ||
1027 | /* See btrace.h. */ | |
1028 | ||
1029 | void | |
1030 | btrace_free_objfile (struct objfile *objfile) | |
1031 | { | |
1032 | struct thread_info *tp; | |
1033 | ||
1034 | DEBUG ("free objfile"); | |
1035 | ||
034f788c | 1036 | ALL_NON_EXITED_THREADS (tp) |
02d27625 MM |
1037 | btrace_clear (tp); |
1038 | } | |
c12a2917 MM |
1039 | |
1040 | #if defined (HAVE_LIBEXPAT) | |
1041 | ||
1042 | /* Check the btrace document version. */ | |
1043 | ||
1044 | static void | |
1045 | check_xml_btrace_version (struct gdb_xml_parser *parser, | |
1046 | const struct gdb_xml_element *element, | |
1047 | void *user_data, VEC (gdb_xml_value_s) *attributes) | |
1048 | { | |
1049 | const char *version = xml_find_attribute (attributes, "version")->value; | |
1050 | ||
1051 | if (strcmp (version, "1.0") != 0) | |
1052 | gdb_xml_error (parser, _("Unsupported btrace version: \"%s\""), version); | |
1053 | } | |
1054 | ||
1055 | /* Parse a btrace "block" xml record. */ | |
1056 | ||
1057 | static void | |
1058 | parse_xml_btrace_block (struct gdb_xml_parser *parser, | |
1059 | const struct gdb_xml_element *element, | |
1060 | void *user_data, VEC (gdb_xml_value_s) *attributes) | |
1061 | { | |
734b0e4b | 1062 | struct btrace_data *btrace; |
c12a2917 MM |
1063 | struct btrace_block *block; |
1064 | ULONGEST *begin, *end; | |
1065 | ||
1066 | btrace = user_data; | |
734b0e4b MM |
1067 | |
1068 | switch (btrace->format) | |
1069 | { | |
1070 | case BTRACE_FORMAT_BTS: | |
1071 | break; | |
1072 | ||
1073 | case BTRACE_FORMAT_NONE: | |
1074 | btrace->format = BTRACE_FORMAT_BTS; | |
1075 | btrace->variant.bts.blocks = NULL; | |
1076 | break; | |
1077 | ||
1078 | default: | |
1079 | gdb_xml_error (parser, _("Btrace format error.")); | |
1080 | } | |
c12a2917 MM |
1081 | |
1082 | begin = xml_find_attribute (attributes, "begin")->value; | |
1083 | end = xml_find_attribute (attributes, "end")->value; | |
1084 | ||
734b0e4b | 1085 | block = VEC_safe_push (btrace_block_s, btrace->variant.bts.blocks, NULL); |
c12a2917 MM |
1086 | block->begin = *begin; |
1087 | block->end = *end; | |
1088 | } | |
1089 | ||
1090 | static const struct gdb_xml_attribute block_attributes[] = { | |
1091 | { "begin", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1092 | { "end", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
1093 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1094 | }; | |
1095 | ||
1096 | static const struct gdb_xml_attribute btrace_attributes[] = { | |
1097 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
1098 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1099 | }; | |
1100 | ||
1101 | static const struct gdb_xml_element btrace_children[] = { | |
1102 | { "block", block_attributes, NULL, | |
1103 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, parse_xml_btrace_block, NULL }, | |
1104 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1105 | }; | |
1106 | ||
1107 | static const struct gdb_xml_element btrace_elements[] = { | |
1108 | { "btrace", btrace_attributes, btrace_children, GDB_XML_EF_NONE, | |
1109 | check_xml_btrace_version, NULL }, | |
1110 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1111 | }; | |
1112 | ||
1113 | #endif /* defined (HAVE_LIBEXPAT) */ | |
1114 | ||
1115 | /* See btrace.h. */ | |
1116 | ||
734b0e4b MM |
1117 | void |
1118 | parse_xml_btrace (struct btrace_data *btrace, const char *buffer) | |
c12a2917 | 1119 | { |
c12a2917 MM |
1120 | struct cleanup *cleanup; |
1121 | int errcode; | |
1122 | ||
1123 | #if defined (HAVE_LIBEXPAT) | |
1124 | ||
734b0e4b MM |
1125 | btrace->format = BTRACE_FORMAT_NONE; |
1126 | ||
1127 | cleanup = make_cleanup_btrace_data (btrace); | |
c12a2917 | 1128 | errcode = gdb_xml_parse_quick (_("btrace"), "btrace.dtd", btrace_elements, |
734b0e4b | 1129 | buffer, btrace); |
c12a2917 | 1130 | if (errcode != 0) |
969c39fb | 1131 | error (_("Error parsing branch trace.")); |
c12a2917 MM |
1132 | |
1133 | /* Keep parse results. */ | |
1134 | discard_cleanups (cleanup); | |
1135 | ||
1136 | #else /* !defined (HAVE_LIBEXPAT) */ | |
1137 | ||
1138 | error (_("Cannot process branch trace. XML parsing is not supported.")); | |
1139 | ||
1140 | #endif /* !defined (HAVE_LIBEXPAT) */ | |
c12a2917 | 1141 | } |
23a7fe75 | 1142 | |
f4abbc16 MM |
1143 | #if defined (HAVE_LIBEXPAT) |
1144 | ||
1145 | /* Parse a btrace-conf "bts" xml record. */ | |
1146 | ||
1147 | static void | |
1148 | parse_xml_btrace_conf_bts (struct gdb_xml_parser *parser, | |
1149 | const struct gdb_xml_element *element, | |
1150 | void *user_data, VEC (gdb_xml_value_s) *attributes) | |
1151 | { | |
1152 | struct btrace_config *conf; | |
d33501a5 | 1153 | struct gdb_xml_value *size; |
f4abbc16 MM |
1154 | |
1155 | conf = user_data; | |
1156 | conf->format = BTRACE_FORMAT_BTS; | |
d33501a5 MM |
1157 | conf->bts.size = 0; |
1158 | ||
1159 | size = xml_find_attribute (attributes, "size"); | |
1160 | if (size != NULL) | |
1161 | conf->bts.size = (unsigned int) * (ULONGEST *) size->value; | |
f4abbc16 MM |
1162 | } |
1163 | ||
d33501a5 MM |
1164 | static const struct gdb_xml_attribute btrace_conf_bts_attributes[] = { |
1165 | { "size", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL }, | |
1166 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1167 | }; | |
1168 | ||
f4abbc16 | 1169 | static const struct gdb_xml_element btrace_conf_children[] = { |
d33501a5 MM |
1170 | { "bts", btrace_conf_bts_attributes, NULL, GDB_XML_EF_OPTIONAL, |
1171 | parse_xml_btrace_conf_bts, NULL }, | |
f4abbc16 MM |
1172 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
1173 | }; | |
1174 | ||
1175 | static const struct gdb_xml_attribute btrace_conf_attributes[] = { | |
1176 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
1177 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
1178 | }; | |
1179 | ||
1180 | static const struct gdb_xml_element btrace_conf_elements[] = { | |
1181 | { "btrace-conf", btrace_conf_attributes, btrace_conf_children, | |
1182 | GDB_XML_EF_NONE, NULL, NULL }, | |
1183 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
1184 | }; | |
1185 | ||
1186 | #endif /* defined (HAVE_LIBEXPAT) */ | |
1187 | ||
1188 | /* See btrace.h. */ | |
1189 | ||
1190 | void | |
1191 | parse_xml_btrace_conf (struct btrace_config *conf, const char *xml) | |
1192 | { | |
1193 | int errcode; | |
1194 | ||
1195 | #if defined (HAVE_LIBEXPAT) | |
1196 | ||
1197 | errcode = gdb_xml_parse_quick (_("btrace-conf"), "btrace-conf.dtd", | |
1198 | btrace_conf_elements, xml, conf); | |
1199 | if (errcode != 0) | |
1200 | error (_("Error parsing branch trace configuration.")); | |
1201 | ||
1202 | #else /* !defined (HAVE_LIBEXPAT) */ | |
1203 | ||
1204 | error (_("XML parsing is not supported.")); | |
1205 | ||
1206 | #endif /* !defined (HAVE_LIBEXPAT) */ | |
1207 | } | |
1208 | ||
23a7fe75 MM |
1209 | /* See btrace.h. */ |
1210 | ||
1211 | const struct btrace_insn * | |
1212 | btrace_insn_get (const struct btrace_insn_iterator *it) | |
1213 | { | |
1214 | const struct btrace_function *bfun; | |
1215 | unsigned int index, end; | |
1216 | ||
1217 | index = it->index; | |
1218 | bfun = it->function; | |
1219 | ||
31fd9caa MM |
1220 | /* Check if the iterator points to a gap in the trace. */ |
1221 | if (bfun->errcode != 0) | |
1222 | return NULL; | |
1223 | ||
23a7fe75 MM |
1224 | /* The index is within the bounds of this function's instruction vector. */ |
1225 | end = VEC_length (btrace_insn_s, bfun->insn); | |
1226 | gdb_assert (0 < end); | |
1227 | gdb_assert (index < end); | |
1228 | ||
1229 | return VEC_index (btrace_insn_s, bfun->insn, index); | |
1230 | } | |
1231 | ||
1232 | /* See btrace.h. */ | |
1233 | ||
1234 | unsigned int | |
1235 | btrace_insn_number (const struct btrace_insn_iterator *it) | |
1236 | { | |
1237 | const struct btrace_function *bfun; | |
1238 | ||
1239 | bfun = it->function; | |
31fd9caa MM |
1240 | |
1241 | /* Return zero if the iterator points to a gap in the trace. */ | |
1242 | if (bfun->errcode != 0) | |
1243 | return 0; | |
1244 | ||
23a7fe75 MM |
1245 | return bfun->insn_offset + it->index; |
1246 | } | |
1247 | ||
1248 | /* See btrace.h. */ | |
1249 | ||
1250 | void | |
1251 | btrace_insn_begin (struct btrace_insn_iterator *it, | |
1252 | const struct btrace_thread_info *btinfo) | |
1253 | { | |
1254 | const struct btrace_function *bfun; | |
1255 | ||
1256 | bfun = btinfo->begin; | |
1257 | if (bfun == NULL) | |
1258 | error (_("No trace.")); | |
1259 | ||
1260 | it->function = bfun; | |
1261 | it->index = 0; | |
1262 | } | |
1263 | ||
1264 | /* See btrace.h. */ | |
1265 | ||
1266 | void | |
1267 | btrace_insn_end (struct btrace_insn_iterator *it, | |
1268 | const struct btrace_thread_info *btinfo) | |
1269 | { | |
1270 | const struct btrace_function *bfun; | |
1271 | unsigned int length; | |
1272 | ||
1273 | bfun = btinfo->end; | |
1274 | if (bfun == NULL) | |
1275 | error (_("No trace.")); | |
1276 | ||
23a7fe75 MM |
1277 | length = VEC_length (btrace_insn_s, bfun->insn); |
1278 | ||
31fd9caa MM |
1279 | /* The last function may either be a gap or it contains the current |
1280 | instruction, which is one past the end of the execution trace; ignore | |
1281 | it. */ | |
1282 | if (length > 0) | |
1283 | length -= 1; | |
1284 | ||
23a7fe75 | 1285 | it->function = bfun; |
31fd9caa | 1286 | it->index = length; |
23a7fe75 MM |
1287 | } |
1288 | ||
1289 | /* See btrace.h. */ | |
1290 | ||
1291 | unsigned int | |
1292 | btrace_insn_next (struct btrace_insn_iterator *it, unsigned int stride) | |
1293 | { | |
1294 | const struct btrace_function *bfun; | |
1295 | unsigned int index, steps; | |
1296 | ||
1297 | bfun = it->function; | |
1298 | steps = 0; | |
1299 | index = it->index; | |
1300 | ||
1301 | while (stride != 0) | |
1302 | { | |
1303 | unsigned int end, space, adv; | |
1304 | ||
1305 | end = VEC_length (btrace_insn_s, bfun->insn); | |
1306 | ||
31fd9caa MM |
1307 | /* An empty function segment represents a gap in the trace. We count |
1308 | it as one instruction. */ | |
1309 | if (end == 0) | |
1310 | { | |
1311 | const struct btrace_function *next; | |
1312 | ||
1313 | next = bfun->flow.next; | |
1314 | if (next == NULL) | |
1315 | break; | |
1316 | ||
1317 | stride -= 1; | |
1318 | steps += 1; | |
1319 | ||
1320 | bfun = next; | |
1321 | index = 0; | |
1322 | ||
1323 | continue; | |
1324 | } | |
1325 | ||
23a7fe75 MM |
1326 | gdb_assert (0 < end); |
1327 | gdb_assert (index < end); | |
1328 | ||
1329 | /* Compute the number of instructions remaining in this segment. */ | |
1330 | space = end - index; | |
1331 | ||
1332 | /* Advance the iterator as far as possible within this segment. */ | |
1333 | adv = min (space, stride); | |
1334 | stride -= adv; | |
1335 | index += adv; | |
1336 | steps += adv; | |
1337 | ||
1338 | /* Move to the next function if we're at the end of this one. */ | |
1339 | if (index == end) | |
1340 | { | |
1341 | const struct btrace_function *next; | |
1342 | ||
1343 | next = bfun->flow.next; | |
1344 | if (next == NULL) | |
1345 | { | |
1346 | /* We stepped past the last function. | |
1347 | ||
1348 | Let's adjust the index to point to the last instruction in | |
1349 | the previous function. */ | |
1350 | index -= 1; | |
1351 | steps -= 1; | |
1352 | break; | |
1353 | } | |
1354 | ||
1355 | /* We now point to the first instruction in the new function. */ | |
1356 | bfun = next; | |
1357 | index = 0; | |
1358 | } | |
1359 | ||
1360 | /* We did make progress. */ | |
1361 | gdb_assert (adv > 0); | |
1362 | } | |
1363 | ||
1364 | /* Update the iterator. */ | |
1365 | it->function = bfun; | |
1366 | it->index = index; | |
1367 | ||
1368 | return steps; | |
1369 | } | |
1370 | ||
1371 | /* See btrace.h. */ | |
1372 | ||
1373 | unsigned int | |
1374 | btrace_insn_prev (struct btrace_insn_iterator *it, unsigned int stride) | |
1375 | { | |
1376 | const struct btrace_function *bfun; | |
1377 | unsigned int index, steps; | |
1378 | ||
1379 | bfun = it->function; | |
1380 | steps = 0; | |
1381 | index = it->index; | |
1382 | ||
1383 | while (stride != 0) | |
1384 | { | |
1385 | unsigned int adv; | |
1386 | ||
1387 | /* Move to the previous function if we're at the start of this one. */ | |
1388 | if (index == 0) | |
1389 | { | |
1390 | const struct btrace_function *prev; | |
1391 | ||
1392 | prev = bfun->flow.prev; | |
1393 | if (prev == NULL) | |
1394 | break; | |
1395 | ||
1396 | /* We point to one after the last instruction in the new function. */ | |
1397 | bfun = prev; | |
1398 | index = VEC_length (btrace_insn_s, bfun->insn); | |
1399 | ||
31fd9caa MM |
1400 | /* An empty function segment represents a gap in the trace. We count |
1401 | it as one instruction. */ | |
1402 | if (index == 0) | |
1403 | { | |
1404 | stride -= 1; | |
1405 | steps += 1; | |
1406 | ||
1407 | continue; | |
1408 | } | |
23a7fe75 MM |
1409 | } |
1410 | ||
1411 | /* Advance the iterator as far as possible within this segment. */ | |
1412 | adv = min (index, stride); | |
31fd9caa | 1413 | |
23a7fe75 MM |
1414 | stride -= adv; |
1415 | index -= adv; | |
1416 | steps += adv; | |
1417 | ||
1418 | /* We did make progress. */ | |
1419 | gdb_assert (adv > 0); | |
1420 | } | |
1421 | ||
1422 | /* Update the iterator. */ | |
1423 | it->function = bfun; | |
1424 | it->index = index; | |
1425 | ||
1426 | return steps; | |
1427 | } | |
1428 | ||
1429 | /* See btrace.h. */ | |
1430 | ||
1431 | int | |
1432 | btrace_insn_cmp (const struct btrace_insn_iterator *lhs, | |
1433 | const struct btrace_insn_iterator *rhs) | |
1434 | { | |
1435 | unsigned int lnum, rnum; | |
1436 | ||
1437 | lnum = btrace_insn_number (lhs); | |
1438 | rnum = btrace_insn_number (rhs); | |
1439 | ||
31fd9caa MM |
1440 | /* A gap has an instruction number of zero. Things are getting more |
1441 | complicated if gaps are involved. | |
1442 | ||
1443 | We take the instruction number offset from the iterator's function. | |
1444 | This is the number of the first instruction after the gap. | |
1445 | ||
1446 | This is OK as long as both lhs and rhs point to gaps. If only one of | |
1447 | them does, we need to adjust the number based on the other's regular | |
1448 | instruction number. Otherwise, a gap might compare equal to an | |
1449 | instruction. */ | |
1450 | ||
1451 | if (lnum == 0 && rnum == 0) | |
1452 | { | |
1453 | lnum = lhs->function->insn_offset; | |
1454 | rnum = rhs->function->insn_offset; | |
1455 | } | |
1456 | else if (lnum == 0) | |
1457 | { | |
1458 | lnum = lhs->function->insn_offset; | |
1459 | ||
1460 | if (lnum == rnum) | |
1461 | lnum -= 1; | |
1462 | } | |
1463 | else if (rnum == 0) | |
1464 | { | |
1465 | rnum = rhs->function->insn_offset; | |
1466 | ||
1467 | if (rnum == lnum) | |
1468 | rnum -= 1; | |
1469 | } | |
1470 | ||
23a7fe75 MM |
1471 | return (int) (lnum - rnum); |
1472 | } | |
1473 | ||
1474 | /* See btrace.h. */ | |
1475 | ||
1476 | int | |
1477 | btrace_find_insn_by_number (struct btrace_insn_iterator *it, | |
1478 | const struct btrace_thread_info *btinfo, | |
1479 | unsigned int number) | |
1480 | { | |
1481 | const struct btrace_function *bfun; | |
31fd9caa | 1482 | unsigned int end, length; |
23a7fe75 MM |
1483 | |
1484 | for (bfun = btinfo->end; bfun != NULL; bfun = bfun->flow.prev) | |
31fd9caa MM |
1485 | { |
1486 | /* Skip gaps. */ | |
1487 | if (bfun->errcode != 0) | |
1488 | continue; | |
1489 | ||
1490 | if (bfun->insn_offset <= number) | |
1491 | break; | |
1492 | } | |
23a7fe75 MM |
1493 | |
1494 | if (bfun == NULL) | |
1495 | return 0; | |
1496 | ||
31fd9caa MM |
1497 | length = VEC_length (btrace_insn_s, bfun->insn); |
1498 | gdb_assert (length > 0); | |
1499 | ||
1500 | end = bfun->insn_offset + length; | |
23a7fe75 MM |
1501 | if (end <= number) |
1502 | return 0; | |
1503 | ||
1504 | it->function = bfun; | |
1505 | it->index = number - bfun->insn_offset; | |
1506 | ||
1507 | return 1; | |
1508 | } | |
1509 | ||
1510 | /* See btrace.h. */ | |
1511 | ||
1512 | const struct btrace_function * | |
1513 | btrace_call_get (const struct btrace_call_iterator *it) | |
1514 | { | |
1515 | return it->function; | |
1516 | } | |
1517 | ||
1518 | /* See btrace.h. */ | |
1519 | ||
1520 | unsigned int | |
1521 | btrace_call_number (const struct btrace_call_iterator *it) | |
1522 | { | |
1523 | const struct btrace_thread_info *btinfo; | |
1524 | const struct btrace_function *bfun; | |
1525 | unsigned int insns; | |
1526 | ||
1527 | btinfo = it->btinfo; | |
1528 | bfun = it->function; | |
1529 | if (bfun != NULL) | |
1530 | return bfun->number; | |
1531 | ||
1532 | /* For the end iterator, i.e. bfun == NULL, we return one more than the | |
1533 | number of the last function. */ | |
1534 | bfun = btinfo->end; | |
1535 | insns = VEC_length (btrace_insn_s, bfun->insn); | |
1536 | ||
1537 | /* If the function contains only a single instruction (i.e. the current | |
1538 | instruction), it will be skipped and its number is already the number | |
1539 | we seek. */ | |
1540 | if (insns == 1) | |
1541 | return bfun->number; | |
1542 | ||
1543 | /* Otherwise, return one more than the number of the last function. */ | |
1544 | return bfun->number + 1; | |
1545 | } | |
1546 | ||
1547 | /* See btrace.h. */ | |
1548 | ||
1549 | void | |
1550 | btrace_call_begin (struct btrace_call_iterator *it, | |
1551 | const struct btrace_thread_info *btinfo) | |
1552 | { | |
1553 | const struct btrace_function *bfun; | |
1554 | ||
1555 | bfun = btinfo->begin; | |
1556 | if (bfun == NULL) | |
1557 | error (_("No trace.")); | |
1558 | ||
1559 | it->btinfo = btinfo; | |
1560 | it->function = bfun; | |
1561 | } | |
1562 | ||
1563 | /* See btrace.h. */ | |
1564 | ||
1565 | void | |
1566 | btrace_call_end (struct btrace_call_iterator *it, | |
1567 | const struct btrace_thread_info *btinfo) | |
1568 | { | |
1569 | const struct btrace_function *bfun; | |
1570 | ||
1571 | bfun = btinfo->end; | |
1572 | if (bfun == NULL) | |
1573 | error (_("No trace.")); | |
1574 | ||
1575 | it->btinfo = btinfo; | |
1576 | it->function = NULL; | |
1577 | } | |
1578 | ||
1579 | /* See btrace.h. */ | |
1580 | ||
1581 | unsigned int | |
1582 | btrace_call_next (struct btrace_call_iterator *it, unsigned int stride) | |
1583 | { | |
1584 | const struct btrace_function *bfun; | |
1585 | unsigned int steps; | |
1586 | ||
1587 | bfun = it->function; | |
1588 | steps = 0; | |
1589 | while (bfun != NULL) | |
1590 | { | |
1591 | const struct btrace_function *next; | |
1592 | unsigned int insns; | |
1593 | ||
1594 | next = bfun->flow.next; | |
1595 | if (next == NULL) | |
1596 | { | |
1597 | /* Ignore the last function if it only contains a single | |
1598 | (i.e. the current) instruction. */ | |
1599 | insns = VEC_length (btrace_insn_s, bfun->insn); | |
1600 | if (insns == 1) | |
1601 | steps -= 1; | |
1602 | } | |
1603 | ||
1604 | if (stride == steps) | |
1605 | break; | |
1606 | ||
1607 | bfun = next; | |
1608 | steps += 1; | |
1609 | } | |
1610 | ||
1611 | it->function = bfun; | |
1612 | return steps; | |
1613 | } | |
1614 | ||
1615 | /* See btrace.h. */ | |
1616 | ||
1617 | unsigned int | |
1618 | btrace_call_prev (struct btrace_call_iterator *it, unsigned int stride) | |
1619 | { | |
1620 | const struct btrace_thread_info *btinfo; | |
1621 | const struct btrace_function *bfun; | |
1622 | unsigned int steps; | |
1623 | ||
1624 | bfun = it->function; | |
1625 | steps = 0; | |
1626 | ||
1627 | if (bfun == NULL) | |
1628 | { | |
1629 | unsigned int insns; | |
1630 | ||
1631 | btinfo = it->btinfo; | |
1632 | bfun = btinfo->end; | |
1633 | if (bfun == NULL) | |
1634 | return 0; | |
1635 | ||
1636 | /* Ignore the last function if it only contains a single | |
1637 | (i.e. the current) instruction. */ | |
1638 | insns = VEC_length (btrace_insn_s, bfun->insn); | |
1639 | if (insns == 1) | |
1640 | bfun = bfun->flow.prev; | |
1641 | ||
1642 | if (bfun == NULL) | |
1643 | return 0; | |
1644 | ||
1645 | steps += 1; | |
1646 | } | |
1647 | ||
1648 | while (steps < stride) | |
1649 | { | |
1650 | const struct btrace_function *prev; | |
1651 | ||
1652 | prev = bfun->flow.prev; | |
1653 | if (prev == NULL) | |
1654 | break; | |
1655 | ||
1656 | bfun = prev; | |
1657 | steps += 1; | |
1658 | } | |
1659 | ||
1660 | it->function = bfun; | |
1661 | return steps; | |
1662 | } | |
1663 | ||
1664 | /* See btrace.h. */ | |
1665 | ||
1666 | int | |
1667 | btrace_call_cmp (const struct btrace_call_iterator *lhs, | |
1668 | const struct btrace_call_iterator *rhs) | |
1669 | { | |
1670 | unsigned int lnum, rnum; | |
1671 | ||
1672 | lnum = btrace_call_number (lhs); | |
1673 | rnum = btrace_call_number (rhs); | |
1674 | ||
1675 | return (int) (lnum - rnum); | |
1676 | } | |
1677 | ||
1678 | /* See btrace.h. */ | |
1679 | ||
1680 | int | |
1681 | btrace_find_call_by_number (struct btrace_call_iterator *it, | |
1682 | const struct btrace_thread_info *btinfo, | |
1683 | unsigned int number) | |
1684 | { | |
1685 | const struct btrace_function *bfun; | |
1686 | ||
1687 | for (bfun = btinfo->end; bfun != NULL; bfun = bfun->flow.prev) | |
1688 | { | |
1689 | unsigned int bnum; | |
1690 | ||
1691 | bnum = bfun->number; | |
1692 | if (number == bnum) | |
1693 | { | |
1694 | it->btinfo = btinfo; | |
1695 | it->function = bfun; | |
1696 | return 1; | |
1697 | } | |
1698 | ||
1699 | /* Functions are ordered and numbered consecutively. We could bail out | |
1700 | earlier. On the other hand, it is very unlikely that we search for | |
1701 | a nonexistent function. */ | |
1702 | } | |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | /* See btrace.h. */ | |
1708 | ||
1709 | void | |
1710 | btrace_set_insn_history (struct btrace_thread_info *btinfo, | |
1711 | const struct btrace_insn_iterator *begin, | |
1712 | const struct btrace_insn_iterator *end) | |
1713 | { | |
1714 | if (btinfo->insn_history == NULL) | |
1715 | btinfo->insn_history = xzalloc (sizeof (*btinfo->insn_history)); | |
1716 | ||
1717 | btinfo->insn_history->begin = *begin; | |
1718 | btinfo->insn_history->end = *end; | |
1719 | } | |
1720 | ||
1721 | /* See btrace.h. */ | |
1722 | ||
1723 | void | |
1724 | btrace_set_call_history (struct btrace_thread_info *btinfo, | |
1725 | const struct btrace_call_iterator *begin, | |
1726 | const struct btrace_call_iterator *end) | |
1727 | { | |
1728 | gdb_assert (begin->btinfo == end->btinfo); | |
1729 | ||
1730 | if (btinfo->call_history == NULL) | |
1731 | btinfo->call_history = xzalloc (sizeof (*btinfo->call_history)); | |
1732 | ||
1733 | btinfo->call_history->begin = *begin; | |
1734 | btinfo->call_history->end = *end; | |
1735 | } | |
07bbe694 MM |
1736 | |
1737 | /* See btrace.h. */ | |
1738 | ||
1739 | int | |
1740 | btrace_is_replaying (struct thread_info *tp) | |
1741 | { | |
1742 | return tp->btrace.replay != NULL; | |
1743 | } | |
6e07b1d2 MM |
1744 | |
1745 | /* See btrace.h. */ | |
1746 | ||
1747 | int | |
1748 | btrace_is_empty (struct thread_info *tp) | |
1749 | { | |
1750 | struct btrace_insn_iterator begin, end; | |
1751 | struct btrace_thread_info *btinfo; | |
1752 | ||
1753 | btinfo = &tp->btrace; | |
1754 | ||
1755 | if (btinfo->begin == NULL) | |
1756 | return 1; | |
1757 | ||
1758 | btrace_insn_begin (&begin, btinfo); | |
1759 | btrace_insn_end (&end, btinfo); | |
1760 | ||
1761 | return btrace_insn_cmp (&begin, &end) == 0; | |
1762 | } | |
734b0e4b MM |
1763 | |
1764 | /* Forward the cleanup request. */ | |
1765 | ||
1766 | static void | |
1767 | do_btrace_data_cleanup (void *arg) | |
1768 | { | |
1769 | btrace_data_fini (arg); | |
1770 | } | |
1771 | ||
1772 | /* See btrace.h. */ | |
1773 | ||
1774 | struct cleanup * | |
1775 | make_cleanup_btrace_data (struct btrace_data *data) | |
1776 | { | |
1777 | return make_cleanup (do_btrace_data_cleanup, data); | |
1778 | } |