1
2
3
4
5
6#include <errno.h>
7#include <inttypes.h>
8#include <stdbool.h>
9#include <stdlib.h>
10#include "debug.h"
11#include "dwarf-aux.h"
12#include "strbuf.h"
13#include "string2.h"
14
15
16
17
18
19
20
21
22const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
23{
24 Dwarf_Files *files;
25 size_t nfiles, i;
26 const char *src = NULL;
27 int ret;
28
29 if (!fname)
30 return NULL;
31
32 ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
33 if (ret != 0)
34 return NULL;
35
36 for (i = 0; i < nfiles; i++) {
37 src = dwarf_filesrc(files, i, NULL, NULL);
38 if (strtailcmp(src, fname) == 0)
39 break;
40 }
41 if (i == nfiles)
42 return NULL;
43 return src;
44}
45
46
47
48
49
50
51
52
53
54const char *cu_get_comp_dir(Dwarf_Die *cu_die)
55{
56 Dwarf_Attribute attr;
57 if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL)
58 return NULL;
59 return dwarf_formstring(&attr);
60}
61
62
63static Dwarf_Line *cu_getsrc_die(Dwarf_Die *cu_die, Dwarf_Addr addr)
64{
65 Dwarf_Addr laddr;
66 Dwarf_Lines *lines;
67 Dwarf_Line *line;
68 size_t nlines, l, u, n;
69 bool flag;
70
71 if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0 ||
72 nlines == 0)
73 return NULL;
74
75
76 l = 0; u = nlines - 1;
77 while (l < u) {
78 n = u - (u - l) / 2;
79 line = dwarf_onesrcline(lines, n);
80 if (!line || dwarf_lineaddr(line, &laddr) != 0)
81 return NULL;
82 if (addr < laddr)
83 u = n - 1;
84 else
85 l = n;
86 }
87
88 do {
89 line = dwarf_onesrcline(lines, --l);
90 if (!line || dwarf_lineaddr(line, &laddr) != 0)
91 return NULL;
92 } while (laddr == addr);
93 l++;
94
95 do {
96 line = dwarf_onesrcline(lines, l++);
97 if (!line || dwarf_lineaddr(line, &laddr) != 0 ||
98 dwarf_linebeginstatement(line, &flag) != 0)
99 return NULL;
100 if (laddr > addr)
101 return NULL;
102 } while (!flag);
103
104 return line;
105}
106
107
108
109
110
111
112
113
114
115
116int cu_find_lineinfo(Dwarf_Die *cu_die, Dwarf_Addr addr,
117 const char **fname, int *lineno)
118{
119 Dwarf_Line *line;
120 Dwarf_Die die_mem;
121 Dwarf_Addr faddr;
122
123 if (die_find_realfunc(cu_die, addr, &die_mem)
124 && die_entrypc(&die_mem, &faddr) == 0 &&
125 faddr == addr) {
126 *fname = dwarf_decl_file(&die_mem);
127 dwarf_decl_line(&die_mem, lineno);
128 goto out;
129 }
130
131 line = cu_getsrc_die(cu_die, addr);
132 if (line && dwarf_lineno(line, lineno) == 0) {
133 *fname = dwarf_linesrc(line, NULL, NULL);
134 if (!*fname)
135
136 *lineno = 0;
137 }
138
139out:
140 return *lineno ?: -ENOENT;
141}
142
143static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data);
144
145
146
147
148
149
150
151
152
153
154
155int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr,
156 int (*callback)(Dwarf_Die *, void *), void *data)
157{
158 Dwarf_Die die_mem;
159 Dwarf_Die *sc_die;
160 int ret = -ENOENT;
161
162
163 for (sc_die = die_find_realfunc(cu_die, addr, &die_mem);
164 sc_die != NULL;
165 sc_die = die_find_child(sc_die, __die_find_inline_cb, &addr,
166 &die_mem)) {
167 ret = callback(sc_die, data);
168 if (ret)
169 break;
170 }
171
172 return ret;
173
174}
175
176
177
178
179
180
181
182
183const char *die_get_linkage_name(Dwarf_Die *dw_die)
184{
185 Dwarf_Attribute attr;
186
187 if (dwarf_attr_integrate(dw_die, DW_AT_linkage_name, &attr) == NULL)
188 return NULL;
189 return dwarf_formstring(&attr);
190}
191
192
193
194
195
196
197
198
199bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
200{
201 const char *name;
202
203 name = dwarf_diename(dw_die);
204 return name ? (strcmp(tname, name) == 0) : false;
205}
206
207
208
209
210
211
212
213
214
215bool die_match_name(Dwarf_Die *dw_die, const char *glob)
216{
217 const char *name;
218
219 name = dwarf_diename(dw_die);
220 if (name && strglobmatch(name, glob))
221 return true;
222
223 name = die_get_linkage_name(dw_die);
224 if (name && strglobmatch(name, glob))
225 return true;
226
227 return false;
228}
229
230
231
232
233
234
235
236
237int die_get_call_lineno(Dwarf_Die *in_die)
238{
239 Dwarf_Attribute attr;
240 Dwarf_Word ret;
241
242 if (!dwarf_attr(in_die, DW_AT_call_line, &attr))
243 return -ENOENT;
244
245 dwarf_formudata(&attr, &ret);
246 return (int)ret;
247}
248
249
250
251
252
253
254
255
256
257Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
258{
259 Dwarf_Attribute attr;
260
261 if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) &&
262 dwarf_formref_die(&attr, die_mem))
263 return die_mem;
264 else
265 return NULL;
266}
267
268
269static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
270{
271 int tag;
272
273 do {
274 vr_die = die_get_type(vr_die, die_mem);
275 if (!vr_die)
276 break;
277 tag = dwarf_tag(vr_die);
278 } while (tag == DW_TAG_const_type ||
279 tag == DW_TAG_restrict_type ||
280 tag == DW_TAG_volatile_type ||
281 tag == DW_TAG_shared_type);
282
283 return vr_die;
284}
285
286
287
288
289
290
291
292
293
294
295
296Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
297{
298 do {
299 vr_die = __die_get_real_type(vr_die, die_mem);
300 } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef);
301
302 return vr_die;
303}
304
305
306static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name,
307 Dwarf_Word *result)
308{
309 Dwarf_Attribute attr;
310
311 if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
312 dwarf_formudata(&attr, result) != 0)
313 return -ENOENT;
314
315 return 0;
316}
317
318
319static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name,
320 Dwarf_Sword *result)
321{
322 Dwarf_Attribute attr;
323
324 if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
325 dwarf_formsdata(&attr, result) != 0)
326 return -ENOENT;
327
328 return 0;
329}
330
331
332
333
334
335
336
337
338bool die_is_signed_type(Dwarf_Die *tp_die)
339{
340 Dwarf_Word ret;
341
342 if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret))
343 return false;
344
345 return (ret == DW_ATE_signed_char || ret == DW_ATE_signed ||
346 ret == DW_ATE_signed_fixed);
347}
348
349
350
351
352
353
354
355
356bool die_is_func_def(Dwarf_Die *dw_die)
357{
358 Dwarf_Attribute attr;
359 Dwarf_Addr addr = 0;
360
361 if (dwarf_tag(dw_die) != DW_TAG_subprogram)
362 return false;
363
364 if (dwarf_attr(dw_die, DW_AT_declaration, &attr))
365 return false;
366
367
368
369
370
371
372
373 if (!dwarf_attr(dw_die, DW_AT_inline, &attr) &&
374 die_entrypc(dw_die, &addr) < 0)
375 return false;
376
377 return true;
378}
379
380
381
382
383
384
385
386
387
388
389int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr)
390{
391 Dwarf_Addr base, end;
392 Dwarf_Attribute attr;
393
394 if (!addr)
395 return -EINVAL;
396
397 if (dwarf_entrypc(dw_die, addr) == 0)
398 return 0;
399
400
401
402
403
404 if (!dwarf_attr(dw_die, DW_AT_ranges, &attr))
405 return -ENOENT;
406
407 return dwarf_ranges(dw_die, 0, &base, addr, &end) < 0 ? -ENOENT : 0;
408}
409
410
411
412
413
414
415
416
417
418
419bool die_is_func_instance(Dwarf_Die *dw_die)
420{
421 Dwarf_Addr tmp;
422 Dwarf_Attribute attr_mem;
423 int tag = dwarf_tag(dw_die);
424
425 if (tag != DW_TAG_subprogram &&
426 tag != DW_TAG_inlined_subroutine)
427 return false;
428
429 return dwarf_entrypc(dw_die, &tmp) == 0 ||
430 dwarf_attr(dw_die, DW_AT_ranges, &attr_mem) != NULL;
431}
432
433
434
435
436
437
438
439
440
441int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs)
442{
443 Dwarf_Attribute attr;
444 Dwarf_Op *expr;
445 size_t nexpr;
446 int ret;
447
448 if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL)
449 return -ENOENT;
450
451 if (dwarf_formudata(&attr, offs) != 0) {
452
453 ret = dwarf_getlocation(&attr, &expr, &nexpr);
454 if (ret < 0 || nexpr == 0)
455 return -ENOENT;
456
457 if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) {
458 pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n",
459 expr[0].atom, nexpr);
460 return -ENOTSUP;
461 }
462 *offs = (Dwarf_Word)expr[0].number;
463 }
464 return 0;
465}
466
467
468static int die_get_call_fileno(Dwarf_Die *in_die)
469{
470 Dwarf_Sword idx;
471
472 if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0)
473 return (int)idx;
474 else
475 return -ENOENT;
476}
477
478
479static int die_get_decl_fileno(Dwarf_Die *pdie)
480{
481 Dwarf_Sword idx;
482
483 if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0)
484 return (int)idx;
485 else
486 return -ENOENT;
487}
488
489
490
491
492
493
494
495
496const char *die_get_call_file(Dwarf_Die *in_die)
497{
498 Dwarf_Die cu_die;
499 Dwarf_Files *files;
500 int idx;
501
502 idx = die_get_call_fileno(in_die);
503 if (idx < 0 || !dwarf_diecu(in_die, &cu_die, NULL, NULL) ||
504 dwarf_getsrcfiles(&cu_die, &files, NULL) != 0)
505 return NULL;
506
507 return dwarf_filesrc(files, idx, NULL, NULL);
508}
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
527 int (*callback)(Dwarf_Die *, void *),
528 void *data, Dwarf_Die *die_mem)
529{
530 Dwarf_Die child_die;
531 int ret;
532
533 ret = dwarf_child(rt_die, die_mem);
534 if (ret != 0)
535 return NULL;
536
537 do {
538 ret = callback(die_mem, data);
539 if (ret == DIE_FIND_CB_END)
540 return die_mem;
541
542 if ((ret & DIE_FIND_CB_CHILD) &&
543 die_find_child(die_mem, callback, data, &child_die)) {
544 memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
545 return die_mem;
546 }
547 } while ((ret & DIE_FIND_CB_SIBLING) &&
548 dwarf_siblingof(die_mem, die_mem) == 0);
549
550 return NULL;
551}
552
553struct __addr_die_search_param {
554 Dwarf_Addr addr;
555 Dwarf_Die *die_mem;
556};
557
558static int __die_search_func_tail_cb(Dwarf_Die *fn_die, void *data)
559{
560 struct __addr_die_search_param *ad = data;
561 Dwarf_Addr addr = 0;
562
563 if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
564 !dwarf_highpc(fn_die, &addr) &&
565 addr == ad->addr) {
566 memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
567 return DWARF_CB_ABORT;
568 }
569 return DWARF_CB_OK;
570}
571
572
573
574
575
576
577
578
579
580
581
582Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
583 Dwarf_Die *die_mem)
584{
585 struct __addr_die_search_param ad;
586 ad.addr = addr;
587 ad.die_mem = die_mem;
588
589 if (!dwarf_getfuncs(cu_die, __die_search_func_tail_cb, &ad, 0))
590 return NULL;
591 else
592 return die_mem;
593}
594
595
596static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
597{
598 struct __addr_die_search_param *ad = data;
599
600
601
602
603
604 if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
605 dwarf_haspc(fn_die, ad->addr)) {
606 memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
607 return DWARF_CB_ABORT;
608 }
609 return DWARF_CB_OK;
610}
611
612
613
614
615
616
617
618
619
620
621Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
622 Dwarf_Die *die_mem)
623{
624 struct __addr_die_search_param ad;
625 ad.addr = addr;
626 ad.die_mem = die_mem;
627
628 if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0))
629 return NULL;
630 else
631 return die_mem;
632}
633
634
635static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data)
636{
637 Dwarf_Addr *addr = data;
638
639 if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine &&
640 dwarf_haspc(die_mem, *addr))
641 return DIE_FIND_CB_END;
642
643 return DIE_FIND_CB_CONTINUE;
644}
645
646
647
648
649
650
651
652
653
654
655
656
657Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
658 Dwarf_Die *die_mem)
659{
660 return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem);
661}
662
663
664
665
666
667
668
669
670
671
672
673
674Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
675 Dwarf_Die *die_mem)
676{
677 Dwarf_Die tmp_die;
678
679 sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die);
680 if (!sp_die)
681 return NULL;
682
683
684 while (sp_die) {
685 memcpy(die_mem, sp_die, sizeof(Dwarf_Die));
686 sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr,
687 &tmp_die);
688 }
689
690 return die_mem;
691}
692
693struct __instance_walk_param {
694 void *addr;
695 int (*callback)(Dwarf_Die *, void *);
696 void *data;
697 int retval;
698};
699
700static int __die_walk_instances_cb(Dwarf_Die *inst, void *data)
701{
702 struct __instance_walk_param *iwp = data;
703 Dwarf_Attribute attr_mem;
704 Dwarf_Die origin_mem;
705 Dwarf_Attribute *attr;
706 Dwarf_Die *origin;
707 int tmp;
708
709 if (!die_is_func_instance(inst))
710 return DIE_FIND_CB_CONTINUE;
711
712 attr = dwarf_attr(inst, DW_AT_abstract_origin, &attr_mem);
713 if (attr == NULL)
714 return DIE_FIND_CB_CONTINUE;
715
716 origin = dwarf_formref_die(attr, &origin_mem);
717 if (origin == NULL || origin->addr != iwp->addr)
718 return DIE_FIND_CB_CONTINUE;
719
720
721 if (dwarf_tag(inst) == DW_TAG_inlined_subroutine) {
722 dwarf_decl_line(origin, &tmp);
723 if (die_get_call_lineno(inst) == tmp) {
724 tmp = die_get_decl_fileno(origin);
725 if (die_get_call_fileno(inst) == tmp)
726 return DIE_FIND_CB_CONTINUE;
727 }
728 }
729
730 iwp->retval = iwp->callback(inst, iwp->data);
731
732 return (iwp->retval) ? DIE_FIND_CB_END : DIE_FIND_CB_CONTINUE;
733}
734
735
736
737
738
739
740
741
742
743
744
745int die_walk_instances(Dwarf_Die *or_die, int (*callback)(Dwarf_Die *, void *),
746 void *data)
747{
748 Dwarf_Die cu_die;
749 Dwarf_Die die_mem;
750 struct __instance_walk_param iwp = {
751 .addr = or_die->addr,
752 .callback = callback,
753 .data = data,
754 .retval = -ENOENT,
755 };
756
757 if (dwarf_diecu(or_die, &cu_die, NULL, NULL) == NULL)
758 return -ENOENT;
759
760 die_find_child(&cu_die, __die_walk_instances_cb, &iwp, &die_mem);
761
762 return iwp.retval;
763}
764
765
766struct __line_walk_param {
767 bool recursive;
768 line_walk_callback_t callback;
769 void *data;
770 int retval;
771};
772
773static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data)
774{
775 struct __line_walk_param *lw = data;
776 Dwarf_Addr addr = 0;
777 const char *fname;
778 int lineno;
779
780 if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) {
781 fname = die_get_call_file(in_die);
782 lineno = die_get_call_lineno(in_die);
783 if (fname && lineno > 0 && die_entrypc(in_die, &addr) == 0) {
784 lw->retval = lw->callback(fname, lineno, addr, lw->data);
785 if (lw->retval != 0)
786 return DIE_FIND_CB_END;
787 }
788 if (!lw->recursive)
789 return DIE_FIND_CB_SIBLING;
790 }
791
792 if (addr) {
793 fname = dwarf_decl_file(in_die);
794 if (fname && dwarf_decl_line(in_die, &lineno) == 0) {
795 lw->retval = lw->callback(fname, lineno, addr, lw->data);
796 if (lw->retval != 0)
797 return DIE_FIND_CB_END;
798 }
799 }
800
801
802 return DIE_FIND_CB_CONTINUE;
803}
804
805
806static int __die_walk_funclines(Dwarf_Die *sp_die, bool recursive,
807 line_walk_callback_t callback, void *data)
808{
809 struct __line_walk_param lw = {
810 .recursive = recursive,
811 .callback = callback,
812 .data = data,
813 .retval = 0,
814 };
815 Dwarf_Die die_mem;
816 Dwarf_Addr addr;
817 const char *fname;
818 int lineno;
819
820
821 fname = dwarf_decl_file(sp_die);
822 if (fname && dwarf_decl_line(sp_die, &lineno) == 0 &&
823 die_entrypc(sp_die, &addr) == 0) {
824 lw.retval = callback(fname, lineno, addr, data);
825 if (lw.retval != 0)
826 goto done;
827 }
828 die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem);
829done:
830 return lw.retval;
831}
832
833static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data)
834{
835 struct __line_walk_param *lw = data;
836
837
838
839
840
841 lw->retval = __die_walk_funclines(sp_die, true, lw->callback, lw->data);
842 if (lw->retval != 0)
843 return DWARF_CB_ABORT;
844
845 return DWARF_CB_OK;
846}
847
848
849
850
851
852
853
854
855
856
857
858
859
860int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data)
861{
862 Dwarf_Lines *lines;
863 Dwarf_Line *line;
864 Dwarf_Addr addr;
865 const char *fname, *decf = NULL, *inf = NULL;
866 int lineno, ret = 0;
867 int decl = 0, inl;
868 Dwarf_Die die_mem, *cu_die;
869 size_t nlines, i;
870 bool flag;
871
872
873 if (dwarf_tag(rt_die) != DW_TAG_compile_unit) {
874 cu_die = dwarf_diecu(rt_die, &die_mem, NULL, NULL);
875 dwarf_decl_line(rt_die, &decl);
876 decf = dwarf_decl_file(rt_die);
877 } else
878 cu_die = rt_die;
879 if (!cu_die) {
880 pr_debug2("Failed to get CU from given DIE.\n");
881 return -EINVAL;
882 }
883
884
885 if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) {
886 pr_debug2("Failed to get source lines on this CU.\n");
887 return -ENOENT;
888 }
889 pr_debug2("Get %zd lines from this CU\n", nlines);
890
891
892 for (i = 0; i < nlines; i++) {
893 line = dwarf_onesrcline(lines, i);
894 if (line == NULL ||
895 dwarf_lineno(line, &lineno) != 0 ||
896 dwarf_lineaddr(line, &addr) != 0) {
897 pr_debug2("Failed to get line info. "
898 "Possible error in debuginfo.\n");
899 continue;
900 }
901
902 if (dwarf_lineendsequence(line, &flag) != 0 || flag)
903 continue;
904
905 if (dwarf_linebeginstatement(line, &flag) != 0 || !flag)
906 continue;
907
908 if (rt_die != cu_die) {
909
910
911
912
913
914 if (!dwarf_haspc(rt_die, addr))
915 continue;
916
917 if (die_find_inlinefunc(rt_die, addr, &die_mem)) {
918
919 inf = die_get_call_file(&die_mem);
920 if ((inf && !strcmp(inf, decf)) &&
921 die_get_call_lineno(&die_mem) == lineno)
922 goto found;
923
924 dwarf_decl_line(&die_mem, &inl);
925 if (inl != decl ||
926 decf != dwarf_decl_file(&die_mem))
927 continue;
928 }
929 }
930found:
931
932 fname = dwarf_linesrc(line, NULL, NULL);
933
934 ret = callback(fname, lineno, addr, data);
935 if (ret != 0)
936 return ret;
937 }
938
939
940
941
942
943 if (rt_die != cu_die)
944
945
946
947
948
949 ret = __die_walk_funclines(rt_die, false, callback, data);
950 else {
951 struct __line_walk_param param = {
952 .callback = callback,
953 .data = data,
954 .retval = 0,
955 };
956 dwarf_getfuncs(cu_die, __die_walk_culines_cb, ¶m, 0);
957 ret = param.retval;
958 }
959
960 return ret;
961}
962
963struct __find_variable_param {
964 const char *name;
965 Dwarf_Addr addr;
966};
967
968static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data)
969{
970 struct __find_variable_param *fvp = data;
971 Dwarf_Attribute attr;
972 int tag;
973
974 tag = dwarf_tag(die_mem);
975 if ((tag == DW_TAG_formal_parameter ||
976 tag == DW_TAG_variable) &&
977 die_compare_name(die_mem, fvp->name) &&
978
979
980
981
982 (dwarf_attr(die_mem, DW_AT_external, &attr) ||
983 dwarf_attr(die_mem, DW_AT_location, &attr) ||
984 dwarf_attr(die_mem, DW_AT_const_value, &attr)))
985 return DIE_FIND_CB_END;
986 if (dwarf_haspc(die_mem, fvp->addr))
987 return DIE_FIND_CB_CONTINUE;
988 else
989 return DIE_FIND_CB_SIBLING;
990}
991
992
993
994
995
996
997
998
999
1000
1001Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
1002 Dwarf_Addr addr, Dwarf_Die *die_mem)
1003{
1004 struct __find_variable_param fvp = { .name = name, .addr = addr};
1005
1006 return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp,
1007 die_mem);
1008}
1009
1010static int __die_find_member_cb(Dwarf_Die *die_mem, void *data)
1011{
1012 const char *name = data;
1013
1014 if (dwarf_tag(die_mem) == DW_TAG_member) {
1015 if (die_compare_name(die_mem, name))
1016 return DIE_FIND_CB_END;
1017 else if (!dwarf_diename(die_mem)) {
1018 Dwarf_Die type_die, tmp_die;
1019 if (die_get_type(die_mem, &type_die) &&
1020 die_find_member(&type_die, name, &tmp_die))
1021 return DIE_FIND_CB_END;
1022 }
1023 }
1024 return DIE_FIND_CB_SIBLING;
1025}
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
1036 Dwarf_Die *die_mem)
1037{
1038 return die_find_child(st_die, __die_find_member_cb, (void *)name,
1039 die_mem);
1040}
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
1053{
1054 Dwarf_Die type;
1055 int tag, ret;
1056 const char *tmp = "";
1057
1058 if (__die_get_real_type(vr_die, &type) == NULL)
1059 return -ENOENT;
1060
1061 tag = dwarf_tag(&type);
1062 if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)
1063 tmp = "*";
1064 else if (tag == DW_TAG_subroutine_type) {
1065
1066 return strbuf_add(buf, "(function_type)", 15);
1067 } else {
1068 if (!dwarf_diename(&type))
1069 return -ENOENT;
1070 if (tag == DW_TAG_union_type)
1071 tmp = "union ";
1072 else if (tag == DW_TAG_structure_type)
1073 tmp = "struct ";
1074 else if (tag == DW_TAG_enumeration_type)
1075 tmp = "enum ";
1076
1077 return strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
1078 }
1079 ret = die_get_typename(&type, buf);
1080 return ret ? ret : strbuf_addstr(buf, tmp);
1081}
1082
1083
1084
1085
1086
1087
1088
1089
1090int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
1091{
1092 int ret;
1093
1094 ret = die_get_typename(vr_die, buf);
1095 if (ret < 0) {
1096 pr_debug("Failed to get type, make it unknown.\n");
1097 ret = strbuf_add(buf, " (unknown_type)", 14);
1098 }
1099
1100 return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
1101}
1102
1103#ifdef HAVE_DWARF_GETLOCATIONS_SUPPORT
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die,
1114 struct strbuf *buf)
1115{
1116 Dwarf_Die *scopes;
1117 int count;
1118 size_t offset = 0;
1119 Dwarf_Addr base;
1120 Dwarf_Addr start, end;
1121 Dwarf_Addr entry;
1122 int ret;
1123 bool first = true;
1124 const char *name;
1125
1126 ret = die_entrypc(sp_die, &entry);
1127 if (ret)
1128 return ret;
1129
1130 name = dwarf_diename(sp_die);
1131 if (!name)
1132 return -ENOENT;
1133
1134 count = dwarf_getscopes_die(vr_die, &scopes);
1135
1136
1137 if (count <= 1) {
1138 ret = -EINVAL;
1139 goto out;
1140 }
1141
1142 while ((offset = dwarf_ranges(&scopes[1], offset, &base,
1143 &start, &end)) > 0) {
1144 start -= entry;
1145 end -= entry;
1146
1147 if (first) {
1148 ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
1149 name, start, end);
1150 first = false;
1151 } else {
1152 ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
1153 start, end);
1154 }
1155 if (ret < 0)
1156 goto out;
1157 }
1158
1159 if (!first)
1160 ret = strbuf_add(buf, "]>", 2);
1161
1162out:
1163 free(scopes);
1164 return ret;
1165}
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
1177{
1178 int ret = 0;
1179 Dwarf_Addr base;
1180 Dwarf_Addr start, end;
1181 Dwarf_Addr entry;
1182 Dwarf_Op *op;
1183 size_t nops;
1184 size_t offset = 0;
1185 Dwarf_Attribute attr;
1186 bool first = true;
1187 const char *name;
1188
1189 ret = die_entrypc(sp_die, &entry);
1190 if (ret)
1191 return ret;
1192
1193 name = dwarf_diename(sp_die);
1194 if (!name)
1195 return -ENOENT;
1196
1197 if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
1198 return -EINVAL;
1199
1200 while ((offset = dwarf_getlocations(&attr, offset, &base,
1201 &start, &end, &op, &nops)) > 0) {
1202 if (start == 0) {
1203
1204 ret = die_get_var_innermost_scope(sp_die, vr_die, buf);
1205 goto out;
1206 }
1207
1208
1209 start -= entry;
1210 end -= entry;
1211 if (first) {
1212 ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
1213 name, start, end);
1214 first = false;
1215 } else {
1216 ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
1217 start, end);
1218 }
1219 if (ret < 0)
1220 goto out;
1221 }
1222
1223 if (!first)
1224 ret = strbuf_add(buf, "]>", 2);
1225out:
1226 return ret;
1227}
1228#else
1229int die_get_var_range(Dwarf_Die *sp_die __maybe_unused,
1230 Dwarf_Die *vr_die __maybe_unused,
1231 struct strbuf *buf __maybe_unused)
1232{
1233 return -ENOTSUP;
1234}
1235#endif
1236
1237
1238
1239
1240
1241static bool die_has_loclist(Dwarf_Die *vr_die)
1242{
1243 Dwarf_Attribute loc;
1244 int tag = dwarf_tag(vr_die);
1245
1246 if (tag != DW_TAG_formal_parameter &&
1247 tag != DW_TAG_variable)
1248 return false;
1249
1250 return (dwarf_attr_integrate(vr_die, DW_AT_location, &loc) &&
1251 dwarf_whatform(&loc) == DW_FORM_sec_offset);
1252}
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263bool die_is_optimized_target(Dwarf_Die *cu_die)
1264{
1265 Dwarf_Die tmp_die;
1266
1267 if (die_has_loclist(cu_die))
1268 return true;
1269
1270 if (!dwarf_child(cu_die, &tmp_die) &&
1271 die_is_optimized_target(&tmp_die))
1272 return true;
1273
1274 if (!dwarf_siblingof(cu_die, &tmp_die) &&
1275 die_is_optimized_target(&tmp_die))
1276 return true;
1277
1278 return false;
1279}
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293static bool die_search_idx(Dwarf_Lines *lines, unsigned long nr_lines,
1294 Dwarf_Addr addr, unsigned long *idx)
1295{
1296 unsigned long i;
1297 Dwarf_Addr tmp;
1298
1299 for (i = 0; i < nr_lines; i++) {
1300 if (dwarf_lineaddr(dwarf_onesrcline(lines, i), &tmp))
1301 return false;
1302
1303 if (tmp == addr) {
1304 *idx = i;
1305 return true;
1306 }
1307 }
1308 return false;
1309}
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322static bool die_get_postprologue_addr(unsigned long entrypc_idx,
1323 Dwarf_Lines *lines,
1324 unsigned long nr_lines,
1325 Dwarf_Addr highpc,
1326 Dwarf_Addr *postprologue_addr)
1327{
1328 unsigned long i;
1329 int entrypc_lno, lno;
1330 Dwarf_Line *line;
1331 Dwarf_Addr addr;
1332 bool p_end;
1333
1334
1335 line = dwarf_onesrcline(lines, entrypc_idx);
1336 if (dwarf_lineno(line, &entrypc_lno))
1337 return false;
1338
1339 for (i = entrypc_idx; i < nr_lines; i++) {
1340 line = dwarf_onesrcline(lines, i);
1341
1342 if (dwarf_lineaddr(line, &addr) ||
1343 dwarf_lineno(line, &lno) ||
1344 dwarf_lineprologueend(line, &p_end))
1345 return false;
1346
1347
1348 if (addr >= highpc)
1349 break;
1350
1351
1352 if (p_end)
1353 break;
1354
1355
1356 if (lno != entrypc_lno)
1357 break;
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367 if (i != entrypc_idx)
1368 break;
1369 }
1370
1371 dwarf_lineaddr(line, postprologue_addr);
1372 if (*postprologue_addr >= highpc)
1373 dwarf_lineaddr(dwarf_onesrcline(lines, i - 1),
1374 postprologue_addr);
1375
1376 return true;
1377}
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die,
1392 Dwarf_Addr *entrypc)
1393{
1394 size_t nr_lines = 0;
1395 unsigned long entrypc_idx = 0;
1396 Dwarf_Lines *lines = NULL;
1397 Dwarf_Addr postprologue_addr;
1398 Dwarf_Addr highpc;
1399
1400 if (dwarf_highpc(sp_die, &highpc))
1401 return;
1402
1403 if (dwarf_getsrclines(cu_die, &lines, &nr_lines))
1404 return;
1405
1406 if (!die_search_idx(lines, nr_lines, *entrypc, &entrypc_idx))
1407 return;
1408
1409 if (!die_get_postprologue_addr(entrypc_idx, lines, nr_lines,
1410 highpc, &postprologue_addr))
1411 return;
1412
1413 *entrypc = postprologue_addr;
1414}
1415