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e0d153c6 MH |
1 | /* |
2 | * dwarf-aux.c : libdw auxiliary interfaces | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | */ | |
19 | ||
20 | #include <stdbool.h> | |
21 | #include "util.h" | |
22 | #include "debug.h" | |
23 | #include "dwarf-aux.h" | |
24 | ||
25 | /** | |
26 | * cu_find_realpath - Find the realpath of the target file | |
27 | * @cu_die: A DIE(dwarf information entry) of CU(compilation Unit) | |
28 | * @fname: The tail filename of the target file | |
29 | * | |
30 | * Find the real(long) path of @fname in @cu_die. | |
31 | */ | |
32 | const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) | |
33 | { | |
34 | Dwarf_Files *files; | |
35 | size_t nfiles, i; | |
36 | const char *src = NULL; | |
37 | int ret; | |
38 | ||
39 | if (!fname) | |
40 | return NULL; | |
41 | ||
42 | ret = dwarf_getsrcfiles(cu_die, &files, &nfiles); | |
43 | if (ret != 0) | |
44 | return NULL; | |
45 | ||
46 | for (i = 0; i < nfiles; i++) { | |
47 | src = dwarf_filesrc(files, i, NULL, NULL); | |
48 | if (strtailcmp(src, fname) == 0) | |
49 | break; | |
50 | } | |
51 | if (i == nfiles) | |
52 | return NULL; | |
53 | return src; | |
54 | } | |
55 | ||
56 | /** | |
57 | * cu_get_comp_dir - Get the path of compilation directory | |
58 | * @cu_die: a CU DIE | |
59 | * | |
60 | * Get the path of compilation directory of given @cu_die. | |
61 | * Since this depends on DW_AT_comp_dir, older gcc will not | |
62 | * embedded it. In that case, this returns NULL. | |
63 | */ | |
64 | const char *cu_get_comp_dir(Dwarf_Die *cu_die) | |
65 | { | |
66 | Dwarf_Attribute attr; | |
67 | if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) | |
68 | return NULL; | |
69 | return dwarf_formstring(&attr); | |
70 | } | |
71 | ||
72 | /** | |
73 | * cu_find_lineinfo - Get a line number and file name for given address | |
74 | * @cu_die: a CU DIE | |
75 | * @addr: An address | |
76 | * @fname: a pointer which returns the file name string | |
77 | * @lineno: a pointer which returns the line number | |
78 | * | |
79 | * Find a line number and file name for @addr in @cu_die. | |
80 | */ | |
81 | int cu_find_lineinfo(Dwarf_Die *cu_die, unsigned long addr, | |
82 | const char **fname, int *lineno) | |
83 | { | |
84 | Dwarf_Line *line; | |
85 | Dwarf_Addr laddr; | |
86 | ||
87 | line = dwarf_getsrc_die(cu_die, (Dwarf_Addr)addr); | |
88 | if (line && dwarf_lineaddr(line, &laddr) == 0 && | |
89 | addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) { | |
90 | *fname = dwarf_linesrc(line, NULL, NULL); | |
91 | if (!*fname) | |
92 | /* line number is useless without filename */ | |
93 | *lineno = 0; | |
94 | } | |
95 | ||
96 | return *lineno ?: -ENOENT; | |
97 | } | |
98 | ||
221d0611 MH |
99 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data); |
100 | ||
101 | /** | |
102 | * cu_walk_functions_at - Walk on function DIEs at given address | |
103 | * @cu_die: A CU DIE | |
104 | * @addr: An address | |
105 | * @callback: A callback which called with found DIEs | |
106 | * @data: A user data | |
107 | * | |
108 | * Walk on function DIEs at given @addr in @cu_die. Passed DIEs | |
109 | * should be subprogram or inlined-subroutines. | |
110 | */ | |
111 | int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr, | |
112 | int (*callback)(Dwarf_Die *, void *), void *data) | |
113 | { | |
114 | Dwarf_Die die_mem; | |
115 | Dwarf_Die *sc_die; | |
116 | int ret = -ENOENT; | |
117 | ||
118 | /* Inlined function could be recursive. Trace it until fail */ | |
119 | for (sc_die = die_find_realfunc(cu_die, addr, &die_mem); | |
120 | sc_die != NULL; | |
121 | sc_die = die_find_child(sc_die, __die_find_inline_cb, &addr, | |
122 | &die_mem)) { | |
123 | ret = callback(sc_die, data); | |
124 | if (ret) | |
125 | break; | |
126 | } | |
127 | ||
128 | return ret; | |
129 | ||
130 | } | |
131 | ||
d5a00296 MH |
132 | /** |
133 | * die_get_linkage_name - Get the linkage name of the object | |
134 | * @dw_die: A DIE of the object | |
135 | * | |
136 | * Get the linkage name attiribute of given @dw_die. | |
137 | * For C++ binary, the linkage name will be the mangled symbol. | |
138 | */ | |
139 | const char *die_get_linkage_name(Dwarf_Die *dw_die) | |
140 | { | |
141 | Dwarf_Attribute attr; | |
142 | ||
143 | if (dwarf_attr_integrate(dw_die, DW_AT_linkage_name, &attr) == NULL) | |
144 | return NULL; | |
145 | return dwarf_formstring(&attr); | |
146 | } | |
147 | ||
e0d153c6 MH |
148 | /** |
149 | * die_compare_name - Compare diename and tname | |
150 | * @dw_die: a DIE | |
151 | * @tname: a string of target name | |
152 | * | |
153 | * Compare the name of @dw_die and @tname. Return false if @dw_die has no name. | |
154 | */ | |
155 | bool die_compare_name(Dwarf_Die *dw_die, const char *tname) | |
156 | { | |
157 | const char *name; | |
4c859351 | 158 | |
e0d153c6 MH |
159 | name = dwarf_diename(dw_die); |
160 | return name ? (strcmp(tname, name) == 0) : false; | |
161 | } | |
162 | ||
4c859351 | 163 | /** |
d5a00296 | 164 | * die_match_name - Match diename/linkage name and glob |
4c859351 MH |
165 | * @dw_die: a DIE |
166 | * @glob: a string of target glob pattern | |
167 | * | |
168 | * Glob matching the name of @dw_die and @glob. Return false if matching fail. | |
d5a00296 | 169 | * This also match linkage name. |
4c859351 MH |
170 | */ |
171 | bool die_match_name(Dwarf_Die *dw_die, const char *glob) | |
172 | { | |
173 | const char *name; | |
174 | ||
175 | name = dwarf_diename(dw_die); | |
d5a00296 MH |
176 | if (name && strglobmatch(name, glob)) |
177 | return true; | |
178 | /* fall back to check linkage name */ | |
179 | name = die_get_linkage_name(dw_die); | |
180 | if (name && strglobmatch(name, glob)) | |
181 | return true; | |
182 | ||
183 | return false; | |
4c859351 MH |
184 | } |
185 | ||
e0d153c6 MH |
186 | /** |
187 | * die_get_call_lineno - Get callsite line number of inline-function instance | |
188 | * @in_die: a DIE of an inlined function instance | |
189 | * | |
190 | * Get call-site line number of @in_die. This means from where the inline | |
191 | * function is called. | |
192 | */ | |
193 | int die_get_call_lineno(Dwarf_Die *in_die) | |
194 | { | |
195 | Dwarf_Attribute attr; | |
196 | Dwarf_Word ret; | |
197 | ||
198 | if (!dwarf_attr(in_die, DW_AT_call_line, &attr)) | |
199 | return -ENOENT; | |
200 | ||
201 | dwarf_formudata(&attr, &ret); | |
202 | return (int)ret; | |
203 | } | |
204 | ||
205 | /** | |
206 | * die_get_type - Get type DIE | |
207 | * @vr_die: a DIE of a variable | |
208 | * @die_mem: where to store a type DIE | |
209 | * | |
210 | * Get a DIE of the type of given variable (@vr_die), and store | |
211 | * it to die_mem. Return NULL if fails to get a type DIE. | |
212 | */ | |
213 | Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
214 | { | |
215 | Dwarf_Attribute attr; | |
216 | ||
217 | if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) && | |
218 | dwarf_formref_die(&attr, die_mem)) | |
219 | return die_mem; | |
220 | else | |
221 | return NULL; | |
222 | } | |
223 | ||
224 | /* Get a type die, but skip qualifiers */ | |
225 | static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
226 | { | |
227 | int tag; | |
228 | ||
229 | do { | |
230 | vr_die = die_get_type(vr_die, die_mem); | |
231 | if (!vr_die) | |
232 | break; | |
233 | tag = dwarf_tag(vr_die); | |
234 | } while (tag == DW_TAG_const_type || | |
235 | tag == DW_TAG_restrict_type || | |
236 | tag == DW_TAG_volatile_type || | |
237 | tag == DW_TAG_shared_type); | |
238 | ||
239 | return vr_die; | |
240 | } | |
241 | ||
242 | /** | |
243 | * die_get_real_type - Get a type die, but skip qualifiers and typedef | |
244 | * @vr_die: a DIE of a variable | |
245 | * @die_mem: where to store a type DIE | |
246 | * | |
247 | * Get a DIE of the type of given variable (@vr_die), and store | |
248 | * it to die_mem. Return NULL if fails to get a type DIE. | |
249 | * If the type is qualifiers (e.g. const) or typedef, this skips it | |
250 | * and tries to find real type (structure or basic types, e.g. int). | |
251 | */ | |
252 | Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
253 | { | |
254 | do { | |
255 | vr_die = __die_get_real_type(vr_die, die_mem); | |
256 | } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef); | |
257 | ||
258 | return vr_die; | |
259 | } | |
260 | ||
261 | /* Get attribute and translate it as a udata */ | |
262 | static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name, | |
263 | Dwarf_Word *result) | |
264 | { | |
265 | Dwarf_Attribute attr; | |
266 | ||
267 | if (dwarf_attr(tp_die, attr_name, &attr) == NULL || | |
268 | dwarf_formudata(&attr, result) != 0) | |
269 | return -ENOENT; | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
b0e9cb28 MH |
274 | /* Get attribute and translate it as a sdata */ |
275 | static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name, | |
276 | Dwarf_Sword *result) | |
277 | { | |
278 | Dwarf_Attribute attr; | |
279 | ||
280 | if (dwarf_attr(tp_die, attr_name, &attr) == NULL || | |
281 | dwarf_formsdata(&attr, result) != 0) | |
282 | return -ENOENT; | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
e0d153c6 MH |
287 | /** |
288 | * die_is_signed_type - Check whether a type DIE is signed or not | |
289 | * @tp_die: a DIE of a type | |
290 | * | |
291 | * Get the encoding of @tp_die and return true if the encoding | |
292 | * is signed. | |
293 | */ | |
294 | bool die_is_signed_type(Dwarf_Die *tp_die) | |
295 | { | |
296 | Dwarf_Word ret; | |
297 | ||
298 | if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret)) | |
299 | return false; | |
300 | ||
301 | return (ret == DW_ATE_signed_char || ret == DW_ATE_signed || | |
302 | ret == DW_ATE_signed_fixed); | |
303 | } | |
304 | ||
0dbb1cac MH |
305 | /** |
306 | * die_is_func_def - Ensure that this DIE is a subprogram and definition | |
307 | * @dw_die: a DIE | |
308 | * | |
309 | * Ensure that this DIE is a subprogram and NOT a declaration. This | |
310 | * returns true if @dw_die is a function definition. | |
311 | **/ | |
312 | bool die_is_func_def(Dwarf_Die *dw_die) | |
313 | { | |
314 | Dwarf_Attribute attr; | |
315 | ||
316 | return (dwarf_tag(dw_die) == DW_TAG_subprogram && | |
317 | dwarf_attr(dw_die, DW_AT_declaration, &attr) == NULL); | |
318 | } | |
319 | ||
e1ecbbc3 MH |
320 | /** |
321 | * die_is_func_instance - Ensure that this DIE is an instance of a subprogram | |
322 | * @dw_die: a DIE | |
323 | * | |
324 | * Ensure that this DIE is an instance (which has an entry address). | |
325 | * This returns true if @dw_die is a function instance. If not, you need to | |
326 | * call die_walk_instances() to find actual instances. | |
327 | **/ | |
328 | bool die_is_func_instance(Dwarf_Die *dw_die) | |
329 | { | |
330 | Dwarf_Addr tmp; | |
331 | ||
332 | /* Actually gcc optimizes non-inline as like as inlined */ | |
333 | return !dwarf_func_inline(dw_die) && dwarf_entrypc(dw_die, &tmp) == 0; | |
334 | } | |
e0d153c6 MH |
335 | /** |
336 | * die_get_data_member_location - Get the data-member offset | |
337 | * @mb_die: a DIE of a member of a data structure | |
338 | * @offs: The offset of the member in the data structure | |
339 | * | |
340 | * Get the offset of @mb_die in the data structure including @mb_die, and | |
341 | * stores result offset to @offs. If any error occurs this returns errno. | |
342 | */ | |
343 | int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) | |
344 | { | |
345 | Dwarf_Attribute attr; | |
346 | Dwarf_Op *expr; | |
347 | size_t nexpr; | |
348 | int ret; | |
349 | ||
350 | if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL) | |
351 | return -ENOENT; | |
352 | ||
353 | if (dwarf_formudata(&attr, offs) != 0) { | |
354 | /* DW_AT_data_member_location should be DW_OP_plus_uconst */ | |
355 | ret = dwarf_getlocation(&attr, &expr, &nexpr); | |
356 | if (ret < 0 || nexpr == 0) | |
357 | return -ENOENT; | |
358 | ||
359 | if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) { | |
360 | pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n", | |
361 | expr[0].atom, nexpr); | |
362 | return -ENOTSUP; | |
363 | } | |
364 | *offs = (Dwarf_Word)expr[0].number; | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | ||
b0e9cb28 MH |
369 | /* Get the call file index number in CU DIE */ |
370 | static int die_get_call_fileno(Dwarf_Die *in_die) | |
371 | { | |
372 | Dwarf_Sword idx; | |
373 | ||
374 | if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0) | |
375 | return (int)idx; | |
376 | else | |
377 | return -ENOENT; | |
378 | } | |
379 | ||
3f4460a2 MH |
380 | /* Get the declared file index number in CU DIE */ |
381 | static int die_get_decl_fileno(Dwarf_Die *pdie) | |
382 | { | |
383 | Dwarf_Sword idx; | |
384 | ||
385 | if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0) | |
386 | return (int)idx; | |
387 | else | |
388 | return -ENOENT; | |
389 | } | |
390 | ||
b0e9cb28 MH |
391 | /** |
392 | * die_get_call_file - Get callsite file name of inlined function instance | |
393 | * @in_die: a DIE of an inlined function instance | |
394 | * | |
395 | * Get call-site file name of @in_die. This means from which file the inline | |
396 | * function is called. | |
397 | */ | |
398 | const char *die_get_call_file(Dwarf_Die *in_die) | |
399 | { | |
400 | Dwarf_Die cu_die; | |
401 | Dwarf_Files *files; | |
402 | int idx; | |
403 | ||
404 | idx = die_get_call_fileno(in_die); | |
405 | if (idx < 0 || !dwarf_diecu(in_die, &cu_die, NULL, NULL) || | |
406 | dwarf_getsrcfiles(&cu_die, &files, NULL) != 0) | |
407 | return NULL; | |
408 | ||
409 | return dwarf_filesrc(files, idx, NULL, NULL); | |
410 | } | |
411 | ||
412 | ||
e0d153c6 MH |
413 | /** |
414 | * die_find_child - Generic DIE search function in DIE tree | |
415 | * @rt_die: a root DIE | |
416 | * @callback: a callback function | |
417 | * @data: a user data passed to the callback function | |
418 | * @die_mem: a buffer for result DIE | |
419 | * | |
420 | * Trace DIE tree from @rt_die and call @callback for each child DIE. | |
421 | * If @callback returns DIE_FIND_CB_END, this stores the DIE into | |
422 | * @die_mem and returns it. If @callback returns DIE_FIND_CB_CONTINUE, | |
423 | * this continues to trace the tree. Optionally, @callback can return | |
424 | * DIE_FIND_CB_CHILD and DIE_FIND_CB_SIBLING, those means trace only | |
425 | * the children and trace only the siblings respectively. | |
426 | * Returns NULL if @callback can't find any appropriate DIE. | |
427 | */ | |
428 | Dwarf_Die *die_find_child(Dwarf_Die *rt_die, | |
429 | int (*callback)(Dwarf_Die *, void *), | |
430 | void *data, Dwarf_Die *die_mem) | |
431 | { | |
432 | Dwarf_Die child_die; | |
433 | int ret; | |
434 | ||
435 | ret = dwarf_child(rt_die, die_mem); | |
436 | if (ret != 0) | |
437 | return NULL; | |
438 | ||
439 | do { | |
440 | ret = callback(die_mem, data); | |
441 | if (ret == DIE_FIND_CB_END) | |
442 | return die_mem; | |
443 | ||
444 | if ((ret & DIE_FIND_CB_CHILD) && | |
445 | die_find_child(die_mem, callback, data, &child_die)) { | |
446 | memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); | |
447 | return die_mem; | |
448 | } | |
449 | } while ((ret & DIE_FIND_CB_SIBLING) && | |
450 | dwarf_siblingof(die_mem, die_mem) == 0); | |
451 | ||
452 | return NULL; | |
453 | } | |
454 | ||
455 | struct __addr_die_search_param { | |
456 | Dwarf_Addr addr; | |
457 | Dwarf_Die *die_mem; | |
458 | }; | |
459 | ||
d4c537e6 NR |
460 | static int __die_search_func_tail_cb(Dwarf_Die *fn_die, void *data) |
461 | { | |
462 | struct __addr_die_search_param *ad = data; | |
463 | Dwarf_Addr addr = 0; | |
464 | ||
465 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && | |
466 | !dwarf_highpc(fn_die, &addr) && | |
467 | addr == ad->addr) { | |
468 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); | |
469 | return DWARF_CB_ABORT; | |
470 | } | |
471 | return DWARF_CB_OK; | |
472 | } | |
473 | ||
474 | /** | |
475 | * die_find_tailfunc - Search for a non-inlined function with tail call at | |
476 | * given address | |
477 | * @cu_die: a CU DIE which including @addr | |
478 | * @addr: target address | |
479 | * @die_mem: a buffer for result DIE | |
480 | * | |
481 | * Search for a non-inlined function DIE with tail call at @addr. Stores the | |
482 | * DIE to @die_mem and returns it if found. Returns NULL if failed. | |
483 | */ | |
484 | Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr, | |
485 | Dwarf_Die *die_mem) | |
486 | { | |
487 | struct __addr_die_search_param ad; | |
488 | ad.addr = addr; | |
489 | ad.die_mem = die_mem; | |
490 | /* dwarf_getscopes can't find subprogram. */ | |
491 | if (!dwarf_getfuncs(cu_die, __die_search_func_tail_cb, &ad, 0)) | |
492 | return NULL; | |
493 | else | |
494 | return die_mem; | |
495 | } | |
496 | ||
e0d153c6 MH |
497 | /* die_find callback for non-inlined function search */ |
498 | static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) | |
499 | { | |
500 | struct __addr_die_search_param *ad = data; | |
501 | ||
0dbb1cac MH |
502 | /* |
503 | * Since a declaration entry doesn't has given pc, this always returns | |
504 | * function definition entry. | |
505 | */ | |
e0d153c6 MH |
506 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
507 | dwarf_haspc(fn_die, ad->addr)) { | |
508 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); | |
509 | return DWARF_CB_ABORT; | |
510 | } | |
511 | return DWARF_CB_OK; | |
512 | } | |
513 | ||
514 | /** | |
515 | * die_find_realfunc - Search a non-inlined function at given address | |
516 | * @cu_die: a CU DIE which including @addr | |
517 | * @addr: target address | |
518 | * @die_mem: a buffer for result DIE | |
519 | * | |
520 | * Search a non-inlined function DIE which includes @addr. Stores the | |
e08cfd4b | 521 | * DIE to @die_mem and returns it if found. Returns NULL if failed. |
e0d153c6 MH |
522 | */ |
523 | Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr, | |
524 | Dwarf_Die *die_mem) | |
525 | { | |
526 | struct __addr_die_search_param ad; | |
527 | ad.addr = addr; | |
528 | ad.die_mem = die_mem; | |
529 | /* dwarf_getscopes can't find subprogram. */ | |
530 | if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) | |
531 | return NULL; | |
532 | else | |
533 | return die_mem; | |
534 | } | |
535 | ||
536 | /* die_find callback for inline function search */ | |
537 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data) | |
538 | { | |
539 | Dwarf_Addr *addr = data; | |
540 | ||
541 | if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && | |
542 | dwarf_haspc(die_mem, *addr)) | |
543 | return DIE_FIND_CB_END; | |
544 | ||
545 | return DIE_FIND_CB_CONTINUE; | |
546 | } | |
547 | ||
e08cfd4b MH |
548 | /** |
549 | * die_find_top_inlinefunc - Search the top inlined function at given address | |
550 | * @sp_die: a subprogram DIE which including @addr | |
551 | * @addr: target address | |
552 | * @die_mem: a buffer for result DIE | |
553 | * | |
554 | * Search an inlined function DIE which includes @addr. Stores the | |
555 | * DIE to @die_mem and returns it if found. Returns NULL if failed. | |
556 | * Even if several inlined functions are expanded recursively, this | |
557 | * doesn't trace it down, and returns the topmost one. | |
558 | */ | |
559 | Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, | |
560 | Dwarf_Die *die_mem) | |
561 | { | |
562 | return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem); | |
563 | } | |
564 | ||
e0d153c6 MH |
565 | /** |
566 | * die_find_inlinefunc - Search an inlined function at given address | |
e08cfd4b | 567 | * @sp_die: a subprogram DIE which including @addr |
e0d153c6 MH |
568 | * @addr: target address |
569 | * @die_mem: a buffer for result DIE | |
570 | * | |
571 | * Search an inlined function DIE which includes @addr. Stores the | |
e08cfd4b | 572 | * DIE to @die_mem and returns it if found. Returns NULL if failed. |
e0d153c6 | 573 | * If several inlined functions are expanded recursively, this trace |
e08cfd4b | 574 | * it down and returns deepest one. |
e0d153c6 MH |
575 | */ |
576 | Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, | |
577 | Dwarf_Die *die_mem) | |
578 | { | |
579 | Dwarf_Die tmp_die; | |
580 | ||
581 | sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die); | |
582 | if (!sp_die) | |
583 | return NULL; | |
584 | ||
585 | /* Inlined function could be recursive. Trace it until fail */ | |
586 | while (sp_die) { | |
587 | memcpy(die_mem, sp_die, sizeof(Dwarf_Die)); | |
588 | sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, | |
589 | &tmp_die); | |
590 | } | |
591 | ||
592 | return die_mem; | |
593 | } | |
594 | ||
db0d2c64 MH |
595 | struct __instance_walk_param { |
596 | void *addr; | |
597 | int (*callback)(Dwarf_Die *, void *); | |
598 | void *data; | |
599 | int retval; | |
600 | }; | |
601 | ||
602 | static int __die_walk_instances_cb(Dwarf_Die *inst, void *data) | |
603 | { | |
604 | struct __instance_walk_param *iwp = data; | |
605 | Dwarf_Attribute attr_mem; | |
606 | Dwarf_Die origin_mem; | |
607 | Dwarf_Attribute *attr; | |
608 | Dwarf_Die *origin; | |
3f4460a2 | 609 | int tmp; |
db0d2c64 MH |
610 | |
611 | attr = dwarf_attr(inst, DW_AT_abstract_origin, &attr_mem); | |
612 | if (attr == NULL) | |
613 | return DIE_FIND_CB_CONTINUE; | |
614 | ||
615 | origin = dwarf_formref_die(attr, &origin_mem); | |
616 | if (origin == NULL || origin->addr != iwp->addr) | |
617 | return DIE_FIND_CB_CONTINUE; | |
618 | ||
3f4460a2 MH |
619 | /* Ignore redundant instances */ |
620 | if (dwarf_tag(inst) == DW_TAG_inlined_subroutine) { | |
621 | dwarf_decl_line(origin, &tmp); | |
622 | if (die_get_call_lineno(inst) == tmp) { | |
623 | tmp = die_get_decl_fileno(origin); | |
624 | if (die_get_call_fileno(inst) == tmp) | |
625 | return DIE_FIND_CB_CONTINUE; | |
626 | } | |
627 | } | |
628 | ||
db0d2c64 MH |
629 | iwp->retval = iwp->callback(inst, iwp->data); |
630 | ||
631 | return (iwp->retval) ? DIE_FIND_CB_END : DIE_FIND_CB_CONTINUE; | |
632 | } | |
633 | ||
634 | /** | |
635 | * die_walk_instances - Walk on instances of given DIE | |
636 | * @or_die: an abstract original DIE | |
637 | * @callback: a callback function which is called with instance DIE | |
638 | * @data: user data | |
639 | * | |
640 | * Walk on the instances of give @in_die. @in_die must be an inlined function | |
641 | * declartion. This returns the return value of @callback if it returns | |
642 | * non-zero value, or -ENOENT if there is no instance. | |
643 | */ | |
644 | int die_walk_instances(Dwarf_Die *or_die, int (*callback)(Dwarf_Die *, void *), | |
645 | void *data) | |
646 | { | |
647 | Dwarf_Die cu_die; | |
648 | Dwarf_Die die_mem; | |
649 | struct __instance_walk_param iwp = { | |
650 | .addr = or_die->addr, | |
651 | .callback = callback, | |
652 | .data = data, | |
653 | .retval = -ENOENT, | |
654 | }; | |
655 | ||
656 | if (dwarf_diecu(or_die, &cu_die, NULL, NULL) == NULL) | |
657 | return -ENOENT; | |
658 | ||
659 | die_find_child(&cu_die, __die_walk_instances_cb, &iwp, &die_mem); | |
660 | ||
661 | return iwp.retval; | |
662 | } | |
663 | ||
e0d153c6 MH |
664 | /* Line walker internal parameters */ |
665 | struct __line_walk_param { | |
b0e9cb28 | 666 | bool recursive; |
e0d153c6 MH |
667 | line_walk_callback_t callback; |
668 | void *data; | |
669 | int retval; | |
670 | }; | |
671 | ||
672 | static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data) | |
673 | { | |
674 | struct __line_walk_param *lw = data; | |
b0e9cb28 MH |
675 | Dwarf_Addr addr = 0; |
676 | const char *fname; | |
e0d153c6 MH |
677 | int lineno; |
678 | ||
679 | if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) { | |
b0e9cb28 | 680 | fname = die_get_call_file(in_die); |
e0d153c6 | 681 | lineno = die_get_call_lineno(in_die); |
b0e9cb28 MH |
682 | if (fname && lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) { |
683 | lw->retval = lw->callback(fname, lineno, addr, lw->data); | |
684 | if (lw->retval != 0) | |
685 | return DIE_FIND_CB_END; | |
686 | } | |
687 | } | |
688 | if (!lw->recursive) | |
689 | /* Don't need to search recursively */ | |
690 | return DIE_FIND_CB_SIBLING; | |
691 | ||
692 | if (addr) { | |
693 | fname = dwarf_decl_file(in_die); | |
694 | if (fname && dwarf_decl_line(in_die, &lineno) == 0) { | |
695 | lw->retval = lw->callback(fname, lineno, addr, lw->data); | |
e0d153c6 MH |
696 | if (lw->retval != 0) |
697 | return DIE_FIND_CB_END; | |
698 | } | |
699 | } | |
b0e9cb28 MH |
700 | |
701 | /* Continue to search nested inlined function call-sites */ | |
702 | return DIE_FIND_CB_CONTINUE; | |
e0d153c6 MH |
703 | } |
704 | ||
705 | /* Walk on lines of blocks included in given DIE */ | |
b0e9cb28 | 706 | static int __die_walk_funclines(Dwarf_Die *sp_die, bool recursive, |
e0d153c6 MH |
707 | line_walk_callback_t callback, void *data) |
708 | { | |
709 | struct __line_walk_param lw = { | |
b0e9cb28 | 710 | .recursive = recursive, |
e0d153c6 MH |
711 | .callback = callback, |
712 | .data = data, | |
713 | .retval = 0, | |
714 | }; | |
715 | Dwarf_Die die_mem; | |
716 | Dwarf_Addr addr; | |
b0e9cb28 | 717 | const char *fname; |
e0d153c6 MH |
718 | int lineno; |
719 | ||
720 | /* Handle function declaration line */ | |
b0e9cb28 MH |
721 | fname = dwarf_decl_file(sp_die); |
722 | if (fname && dwarf_decl_line(sp_die, &lineno) == 0 && | |
e0d153c6 | 723 | dwarf_entrypc(sp_die, &addr) == 0) { |
b0e9cb28 | 724 | lw.retval = callback(fname, lineno, addr, data); |
e0d153c6 MH |
725 | if (lw.retval != 0) |
726 | goto done; | |
727 | } | |
728 | die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem); | |
729 | done: | |
730 | return lw.retval; | |
731 | } | |
732 | ||
733 | static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data) | |
734 | { | |
735 | struct __line_walk_param *lw = data; | |
736 | ||
b0e9cb28 | 737 | lw->retval = __die_walk_funclines(sp_die, true, lw->callback, lw->data); |
e0d153c6 MH |
738 | if (lw->retval != 0) |
739 | return DWARF_CB_ABORT; | |
740 | ||
741 | return DWARF_CB_OK; | |
742 | } | |
743 | ||
744 | /** | |
745 | * die_walk_lines - Walk on lines inside given DIE | |
a128405c | 746 | * @rt_die: a root DIE (CU, subprogram or inlined_subroutine) |
e0d153c6 MH |
747 | * @callback: callback routine |
748 | * @data: user data | |
749 | * | |
750 | * Walk on all lines inside given @rt_die and call @callback on each line. | |
751 | * If the @rt_die is a function, walk only on the lines inside the function, | |
752 | * otherwise @rt_die must be a CU DIE. | |
753 | * Note that this walks not only dwarf line list, but also function entries | |
754 | * and inline call-site. | |
755 | */ | |
756 | int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data) | |
757 | { | |
758 | Dwarf_Lines *lines; | |
759 | Dwarf_Line *line; | |
760 | Dwarf_Addr addr; | |
75186a9b | 761 | const char *fname, *decf = NULL; |
e0d153c6 | 762 | int lineno, ret = 0; |
75186a9b | 763 | int decl = 0, inl; |
e0d153c6 MH |
764 | Dwarf_Die die_mem, *cu_die; |
765 | size_t nlines, i; | |
766 | ||
767 | /* Get the CU die */ | |
75186a9b | 768 | if (dwarf_tag(rt_die) != DW_TAG_compile_unit) { |
e0d153c6 | 769 | cu_die = dwarf_diecu(rt_die, &die_mem, NULL, NULL); |
75186a9b MH |
770 | dwarf_decl_line(rt_die, &decl); |
771 | decf = dwarf_decl_file(rt_die); | |
772 | } else | |
e0d153c6 MH |
773 | cu_die = rt_die; |
774 | if (!cu_die) { | |
a128405c | 775 | pr_debug2("Failed to get CU from given DIE.\n"); |
e0d153c6 MH |
776 | return -EINVAL; |
777 | } | |
778 | ||
779 | /* Get lines list in the CU */ | |
780 | if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) { | |
781 | pr_debug2("Failed to get source lines on this CU.\n"); | |
782 | return -ENOENT; | |
783 | } | |
784 | pr_debug2("Get %zd lines from this CU\n", nlines); | |
785 | ||
786 | /* Walk on the lines on lines list */ | |
787 | for (i = 0; i < nlines; i++) { | |
788 | line = dwarf_onesrcline(lines, i); | |
789 | if (line == NULL || | |
790 | dwarf_lineno(line, &lineno) != 0 || | |
791 | dwarf_lineaddr(line, &addr) != 0) { | |
792 | pr_debug2("Failed to get line info. " | |
793 | "Possible error in debuginfo.\n"); | |
794 | continue; | |
795 | } | |
796 | /* Filter lines based on address */ | |
86a76027 | 797 | if (rt_die != cu_die) { |
e0d153c6 MH |
798 | /* |
799 | * Address filtering | |
800 | * The line is included in given function, and | |
801 | * no inline block includes it. | |
802 | */ | |
75186a9b | 803 | if (!dwarf_haspc(rt_die, addr)) |
e0d153c6 | 804 | continue; |
75186a9b MH |
805 | if (die_find_inlinefunc(rt_die, addr, &die_mem)) { |
806 | dwarf_decl_line(&die_mem, &inl); | |
807 | if (inl != decl || | |
808 | decf != dwarf_decl_file(&die_mem)) | |
809 | continue; | |
810 | } | |
86a76027 | 811 | } |
e0d153c6 MH |
812 | /* Get source line */ |
813 | fname = dwarf_linesrc(line, NULL, NULL); | |
814 | ||
815 | ret = callback(fname, lineno, addr, data); | |
816 | if (ret != 0) | |
817 | return ret; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Dwarf lines doesn't include function declarations and inlined | |
822 | * subroutines. We have to check functions list or given function. | |
823 | */ | |
824 | if (rt_die != cu_die) | |
b0e9cb28 MH |
825 | /* |
826 | * Don't need walk functions recursively, because nested | |
827 | * inlined functions don't have lines of the specified DIE. | |
828 | */ | |
829 | ret = __die_walk_funclines(rt_die, false, callback, data); | |
e0d153c6 MH |
830 | else { |
831 | struct __line_walk_param param = { | |
832 | .callback = callback, | |
833 | .data = data, | |
834 | .retval = 0, | |
835 | }; | |
836 | dwarf_getfuncs(cu_die, __die_walk_culines_cb, ¶m, 0); | |
837 | ret = param.retval; | |
838 | } | |
839 | ||
840 | return ret; | |
841 | } | |
842 | ||
843 | struct __find_variable_param { | |
844 | const char *name; | |
845 | Dwarf_Addr addr; | |
846 | }; | |
847 | ||
848 | static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) | |
849 | { | |
850 | struct __find_variable_param *fvp = data; | |
082f96a9 | 851 | Dwarf_Attribute attr; |
e0d153c6 MH |
852 | int tag; |
853 | ||
854 | tag = dwarf_tag(die_mem); | |
855 | if ((tag == DW_TAG_formal_parameter || | |
856 | tag == DW_TAG_variable) && | |
082f96a9 MH |
857 | die_compare_name(die_mem, fvp->name) && |
858 | /* Does the DIE have location information or external instance? */ | |
859 | (dwarf_attr(die_mem, DW_AT_external, &attr) || | |
860 | dwarf_attr(die_mem, DW_AT_location, &attr))) | |
e0d153c6 | 861 | return DIE_FIND_CB_END; |
e0d153c6 MH |
862 | if (dwarf_haspc(die_mem, fvp->addr)) |
863 | return DIE_FIND_CB_CONTINUE; | |
864 | else | |
865 | return DIE_FIND_CB_SIBLING; | |
866 | } | |
867 | ||
868 | /** | |
869 | * die_find_variable_at - Find a given name variable at given address | |
870 | * @sp_die: a function DIE | |
871 | * @name: variable name | |
872 | * @addr: address | |
873 | * @die_mem: a buffer for result DIE | |
874 | * | |
875 | * Find a variable DIE called @name at @addr in @sp_die. | |
876 | */ | |
877 | Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name, | |
878 | Dwarf_Addr addr, Dwarf_Die *die_mem) | |
879 | { | |
880 | struct __find_variable_param fvp = { .name = name, .addr = addr}; | |
881 | ||
882 | return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp, | |
883 | die_mem); | |
884 | } | |
885 | ||
886 | static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) | |
887 | { | |
888 | const char *name = data; | |
889 | ||
c7273835 MH |
890 | if (dwarf_tag(die_mem) == DW_TAG_member) { |
891 | if (die_compare_name(die_mem, name)) | |
892 | return DIE_FIND_CB_END; | |
893 | else if (!dwarf_diename(die_mem)) { /* Unnamed structure */ | |
894 | Dwarf_Die type_die, tmp_die; | |
895 | if (die_get_type(die_mem, &type_die) && | |
896 | die_find_member(&type_die, name, &tmp_die)) | |
897 | return DIE_FIND_CB_END; | |
898 | } | |
899 | } | |
e0d153c6 MH |
900 | return DIE_FIND_CB_SIBLING; |
901 | } | |
902 | ||
903 | /** | |
904 | * die_find_member - Find a given name member in a data structure | |
905 | * @st_die: a data structure type DIE | |
906 | * @name: member name | |
907 | * @die_mem: a buffer for result DIE | |
908 | * | |
909 | * Find a member DIE called @name in @st_die. | |
910 | */ | |
911 | Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name, | |
912 | Dwarf_Die *die_mem) | |
913 | { | |
914 | return die_find_child(st_die, __die_find_member_cb, (void *)name, | |
915 | die_mem); | |
916 | } | |
917 | ||
918 | /** | |
919 | * die_get_typename - Get the name of given variable DIE | |
920 | * @vr_die: a variable DIE | |
fb9596d1 | 921 | * @buf: a strbuf for result type name |
e0d153c6 | 922 | * |
fb9596d1 HK |
923 | * Get the name of @vr_die and stores it to @buf. Return 0 if succeeded. |
924 | * and Return -ENOENT if failed to find type name. | |
e0d153c6 MH |
925 | * Note that the result will stores typedef name if possible, and stores |
926 | * "*(function_type)" if the type is a function pointer. | |
927 | */ | |
fb9596d1 | 928 | int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf) |
e0d153c6 MH |
929 | { |
930 | Dwarf_Die type; | |
fb9596d1 | 931 | int tag, ret; |
e0d153c6 MH |
932 | const char *tmp = ""; |
933 | ||
934 | if (__die_get_real_type(vr_die, &type) == NULL) | |
935 | return -ENOENT; | |
936 | ||
937 | tag = dwarf_tag(&type); | |
938 | if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type) | |
939 | tmp = "*"; | |
940 | else if (tag == DW_TAG_subroutine_type) { | |
941 | /* Function pointer */ | |
bf4d5f25 | 942 | return strbuf_add(buf, "(function_type)", 15); |
e0d153c6 MH |
943 | } else { |
944 | if (!dwarf_diename(&type)) | |
945 | return -ENOENT; | |
946 | if (tag == DW_TAG_union_type) | |
947 | tmp = "union "; | |
948 | else if (tag == DW_TAG_structure_type) | |
949 | tmp = "struct "; | |
bb2d17a0 HL |
950 | else if (tag == DW_TAG_enumeration_type) |
951 | tmp = "enum "; | |
e0d153c6 | 952 | /* Write a base name */ |
bf4d5f25 | 953 | return strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type)); |
e0d153c6 | 954 | } |
fb9596d1 | 955 | ret = die_get_typename(&type, buf); |
bf4d5f25 | 956 | return ret ? ret : strbuf_addstr(buf, tmp); |
e0d153c6 MH |
957 | } |
958 | ||
959 | /** | |
960 | * die_get_varname - Get the name and type of given variable DIE | |
961 | * @vr_die: a variable DIE | |
fb9596d1 | 962 | * @buf: a strbuf for type and variable name |
e0d153c6 MH |
963 | * |
964 | * Get the name and type of @vr_die and stores it in @buf as "type\tname". | |
965 | */ | |
fb9596d1 | 966 | int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf) |
e0d153c6 | 967 | { |
fb9596d1 | 968 | int ret; |
e0d153c6 | 969 | |
fb9596d1 | 970 | ret = die_get_typename(vr_die, buf); |
e0d153c6 MH |
971 | if (ret < 0) { |
972 | pr_debug("Failed to get type, make it unknown.\n"); | |
bf4d5f25 | 973 | ret = strbuf_add(buf, " (unknown_type)", 14); |
e0d153c6 | 974 | } |
fb9596d1 | 975 | |
bf4d5f25 | 976 | return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die)); |
e0d153c6 MH |
977 | } |
978 | ||
bd0419e2 | 979 | #ifdef HAVE_DWARF_GETLOCATIONS |
349e8d26 HK |
980 | /** |
981 | * die_get_var_innermost_scope - Get innermost scope range of given variable DIE | |
982 | * @sp_die: a subprogram DIE | |
983 | * @vr_die: a variable DIE | |
984 | * @buf: a strbuf for variable byte offset range | |
985 | * | |
986 | * Get the innermost scope range of @vr_die and stores it in @buf as | |
987 | * "@<function_name+[NN-NN,NN-NN]>". | |
988 | */ | |
989 | static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die, | |
990 | struct strbuf *buf) | |
991 | { | |
992 | Dwarf_Die *scopes; | |
993 | int count; | |
994 | size_t offset = 0; | |
995 | Dwarf_Addr base; | |
996 | Dwarf_Addr start, end; | |
997 | Dwarf_Addr entry; | |
998 | int ret; | |
999 | bool first = true; | |
1000 | const char *name; | |
1001 | ||
1002 | ret = dwarf_entrypc(sp_die, &entry); | |
1003 | if (ret) | |
1004 | return ret; | |
1005 | ||
1006 | name = dwarf_diename(sp_die); | |
1007 | if (!name) | |
1008 | return -ENOENT; | |
1009 | ||
1010 | count = dwarf_getscopes_die(vr_die, &scopes); | |
1011 | ||
1012 | /* (*SCOPES)[1] is the DIE for the scope containing that scope */ | |
1013 | if (count <= 1) { | |
1014 | ret = -EINVAL; | |
1015 | goto out; | |
1016 | } | |
1017 | ||
1018 | while ((offset = dwarf_ranges(&scopes[1], offset, &base, | |
bf4d5f25 | 1019 | &start, &end)) > 0) { |
349e8d26 HK |
1020 | start -= entry; |
1021 | end -= entry; | |
1022 | ||
1023 | if (first) { | |
bf4d5f25 MH |
1024 | ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64, |
1025 | name, start, end); | |
349e8d26 HK |
1026 | first = false; |
1027 | } else { | |
bf4d5f25 MH |
1028 | ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64, |
1029 | start, end); | |
349e8d26 | 1030 | } |
bf4d5f25 MH |
1031 | if (ret < 0) |
1032 | goto out; | |
349e8d26 HK |
1033 | } |
1034 | ||
1035 | if (!first) | |
bf4d5f25 | 1036 | ret = strbuf_add(buf, "]>", 2); |
349e8d26 HK |
1037 | |
1038 | out: | |
1039 | free(scopes); | |
1040 | return ret; | |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * die_get_var_range - Get byte offset range of given variable DIE | |
1045 | * @sp_die: a subprogram DIE | |
1046 | * @vr_die: a variable DIE | |
1047 | * @buf: a strbuf for type and variable name and byte offset range | |
1048 | * | |
1049 | * Get the byte offset range of @vr_die and stores it in @buf as | |
1050 | * "@<function_name+[NN-NN,NN-NN]>". | |
1051 | */ | |
1052 | int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf) | |
1053 | { | |
1054 | int ret = 0; | |
1055 | Dwarf_Addr base; | |
1056 | Dwarf_Addr start, end; | |
1057 | Dwarf_Addr entry; | |
1058 | Dwarf_Op *op; | |
1059 | size_t nops; | |
1060 | size_t offset = 0; | |
1061 | Dwarf_Attribute attr; | |
1062 | bool first = true; | |
1063 | const char *name; | |
1064 | ||
1065 | ret = dwarf_entrypc(sp_die, &entry); | |
1066 | if (ret) | |
1067 | return ret; | |
1068 | ||
1069 | name = dwarf_diename(sp_die); | |
1070 | if (!name) | |
1071 | return -ENOENT; | |
1072 | ||
1073 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL) | |
1074 | return -EINVAL; | |
1075 | ||
bf4d5f25 MH |
1076 | while ((offset = dwarf_getlocations(&attr, offset, &base, |
1077 | &start, &end, &op, &nops)) > 0) { | |
349e8d26 HK |
1078 | if (start == 0) { |
1079 | /* Single Location Descriptions */ | |
1080 | ret = die_get_var_innermost_scope(sp_die, vr_die, buf); | |
bf4d5f25 | 1081 | goto out; |
349e8d26 HK |
1082 | } |
1083 | ||
1084 | /* Location Lists */ | |
1085 | start -= entry; | |
1086 | end -= entry; | |
1087 | if (first) { | |
bf4d5f25 MH |
1088 | ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64, |
1089 | name, start, end); | |
349e8d26 HK |
1090 | first = false; |
1091 | } else { | |
bf4d5f25 MH |
1092 | ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64, |
1093 | start, end); | |
349e8d26 | 1094 | } |
bf4d5f25 MH |
1095 | if (ret < 0) |
1096 | goto out; | |
349e8d26 HK |
1097 | } |
1098 | ||
1099 | if (!first) | |
bf4d5f25 MH |
1100 | ret = strbuf_add(buf, "]>", 2); |
1101 | out: | |
349e8d26 HK |
1102 | return ret; |
1103 | } | |
bd0419e2 ACM |
1104 | #else |
1105 | int die_get_var_range(Dwarf_Die *sp_die __maybe_unused, | |
1106 | Dwarf_Die *vr_die __maybe_unused, | |
1107 | struct strbuf *buf __maybe_unused) | |
1108 | { | |
1109 | return -ENOTSUP; | |
1110 | } | |
1111 | #endif | |
6243b9dc RB |
1112 | |
1113 | /* | |
1114 | * die_has_loclist - Check if DW_AT_location of @vr_die is a location list | |
1115 | * @vr_die: a variable DIE | |
1116 | */ | |
1117 | static bool die_has_loclist(Dwarf_Die *vr_die) | |
1118 | { | |
1119 | Dwarf_Attribute loc; | |
1120 | int tag = dwarf_tag(vr_die); | |
1121 | ||
1122 | if (tag != DW_TAG_formal_parameter && | |
1123 | tag != DW_TAG_variable) | |
1124 | return false; | |
1125 | ||
1126 | return (dwarf_attr_integrate(vr_die, DW_AT_location, &loc) && | |
1127 | dwarf_whatform(&loc) == DW_FORM_sec_offset); | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * die_is_optimized_target - Check if target program is compiled with | |
1132 | * optimization | |
1133 | * @cu_die: a CU DIE | |
1134 | * | |
1135 | * For any object in given CU whose DW_AT_location is a location list, | |
1136 | * target program is compiled with optimization. This is applicable to | |
1137 | * clang as well. | |
1138 | */ | |
1139 | bool die_is_optimized_target(Dwarf_Die *cu_die) | |
1140 | { | |
1141 | Dwarf_Die tmp_die; | |
1142 | ||
1143 | if (die_has_loclist(cu_die)) | |
1144 | return true; | |
1145 | ||
1146 | if (!dwarf_child(cu_die, &tmp_die) && | |
1147 | die_is_optimized_target(&tmp_die)) | |
1148 | return true; | |
1149 | ||
1150 | if (!dwarf_siblingof(cu_die, &tmp_die) && | |
1151 | die_is_optimized_target(&tmp_die)) | |
1152 | return true; | |
1153 | ||
1154 | return false; | |
1155 | } | |
1156 | ||
1157 | /* | |
1158 | * die_search_idx - Search index of given line address | |
1159 | * @lines: Line records of single CU | |
1160 | * @nr_lines: Number of @lines | |
1161 | * @addr: address we are looking for | |
1162 | * @idx: index to be set by this function (return value) | |
1163 | * | |
1164 | * Search for @addr by looping over every lines of CU. If address | |
1165 | * matches, set index of that line in @idx. Note that single source | |
1166 | * line can have multiple line records. i.e. single source line can | |
1167 | * have multiple index. | |
1168 | */ | |
1169 | static bool die_search_idx(Dwarf_Lines *lines, unsigned long nr_lines, | |
1170 | Dwarf_Addr addr, unsigned long *idx) | |
1171 | { | |
1172 | unsigned long i; | |
1173 | Dwarf_Addr tmp; | |
1174 | ||
1175 | for (i = 0; i < nr_lines; i++) { | |
1176 | if (dwarf_lineaddr(dwarf_onesrcline(lines, i), &tmp)) | |
1177 | return false; | |
1178 | ||
1179 | if (tmp == addr) { | |
1180 | *idx = i; | |
1181 | return true; | |
1182 | } | |
1183 | } | |
1184 | return false; | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * die_get_postprologue_addr - Search next address after function prologue | |
1189 | * @entrypc_idx: entrypc index | |
1190 | * @lines: Line records of single CU | |
1191 | * @nr_lines: Number of @lines | |
1192 | * @hignpc: high PC address of function | |
1193 | * @postprologue_addr: Next address after function prologue (return value) | |
1194 | * | |
1195 | * Look for prologue-end marker. If there is no explicit marker, return | |
1196 | * address of next line record or next source line. | |
1197 | */ | |
1198 | static bool die_get_postprologue_addr(unsigned long entrypc_idx, | |
1199 | Dwarf_Lines *lines, | |
1200 | unsigned long nr_lines, | |
1201 | Dwarf_Addr highpc, | |
1202 | Dwarf_Addr *postprologue_addr) | |
1203 | { | |
1204 | unsigned long i; | |
1205 | int entrypc_lno, lno; | |
1206 | Dwarf_Line *line; | |
1207 | Dwarf_Addr addr; | |
1208 | bool p_end; | |
1209 | ||
1210 | /* entrypc_lno is actual source line number */ | |
1211 | line = dwarf_onesrcline(lines, entrypc_idx); | |
1212 | if (dwarf_lineno(line, &entrypc_lno)) | |
1213 | return false; | |
1214 | ||
1215 | for (i = entrypc_idx; i < nr_lines; i++) { | |
1216 | line = dwarf_onesrcline(lines, i); | |
1217 | ||
1218 | if (dwarf_lineaddr(line, &addr) || | |
1219 | dwarf_lineno(line, &lno) || | |
1220 | dwarf_lineprologueend(line, &p_end)) | |
1221 | return false; | |
1222 | ||
1223 | /* highpc is exclusive. [entrypc,highpc) */ | |
1224 | if (addr >= highpc) | |
1225 | break; | |
1226 | ||
1227 | /* clang supports prologue-end marker */ | |
1228 | if (p_end) | |
1229 | break; | |
1230 | ||
1231 | /* Actual next line in source */ | |
1232 | if (lno != entrypc_lno) | |
1233 | break; | |
1234 | ||
1235 | /* | |
1236 | * Single source line can have multiple line records. | |
1237 | * For Example, | |
1238 | * void foo() { printf("hello\n"); } | |
1239 | * contains two line records. One points to declaration and | |
1240 | * other points to printf() line. Variable 'lno' won't get | |
1241 | * incremented in this case but 'i' will. | |
1242 | */ | |
1243 | if (i != entrypc_idx) | |
1244 | break; | |
1245 | } | |
1246 | ||
1247 | dwarf_lineaddr(line, postprologue_addr); | |
1248 | if (*postprologue_addr >= highpc) | |
1249 | dwarf_lineaddr(dwarf_onesrcline(lines, i - 1), | |
1250 | postprologue_addr); | |
1251 | ||
1252 | return true; | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * die_skip_prologue - Use next address after prologue as probe location | |
1257 | * @sp_die: a subprogram DIE | |
1258 | * @cu_die: a CU DIE | |
1259 | * @entrypc: entrypc of the function | |
1260 | * | |
1261 | * Function prologue prepares stack and registers before executing function | |
1262 | * logic. When target program is compiled without optimization, function | |
1263 | * parameter information is only valid after prologue. When we probe entrypc | |
1264 | * of the function, and try to record function parameter, it contains | |
1265 | * garbage value. | |
1266 | */ | |
1267 | void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die, | |
1268 | Dwarf_Addr *entrypc) | |
1269 | { | |
1270 | size_t nr_lines = 0; | |
1271 | unsigned long entrypc_idx = 0; | |
1272 | Dwarf_Lines *lines = NULL; | |
1273 | Dwarf_Addr postprologue_addr; | |
1274 | Dwarf_Addr highpc; | |
1275 | ||
1276 | if (dwarf_highpc(sp_die, &highpc)) | |
1277 | return; | |
1278 | ||
1279 | if (dwarf_getsrclines(cu_die, &lines, &nr_lines)) | |
1280 | return; | |
1281 | ||
1282 | if (!die_search_idx(lines, nr_lines, *entrypc, &entrypc_idx)) | |
1283 | return; | |
1284 | ||
1285 | if (!die_get_postprologue_addr(entrypc_idx, lines, nr_lines, | |
1286 | highpc, &postprologue_addr)) | |
1287 | return; | |
1288 | ||
1289 | *entrypc = postprologue_addr; | |
1290 | } |