mm: rename alloc_pages_exact_node() to __alloc_pages_node()
[linux/fpc-iii.git] / tools / perf / util / dwarf-aux.c
bloba509aa8433a1c7dcac1998025b95258207973c24
1 /*
2 * dwarf-aux.c : libdw auxiliary interfaces
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.
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.
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.
20 #include <stdbool.h>
21 #include "util.h"
22 #include "debug.h"
23 #include "dwarf-aux.h"
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
30 * Find the real(long) path of @fname in @cu_die.
32 const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
34 Dwarf_Files *files;
35 size_t nfiles, i;
36 const char *src = NULL;
37 int ret;
39 if (!fname)
40 return NULL;
42 ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
43 if (ret != 0)
44 return NULL;
46 for (i = 0; i < nfiles; i++) {
47 src = dwarf_filesrc(files, i, NULL, NULL);
48 if (strtailcmp(src, fname) == 0)
49 break;
51 if (i == nfiles)
52 return NULL;
53 return src;
56 /**
57 * cu_get_comp_dir - Get the path of compilation directory
58 * @cu_die: a CU DIE
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.
64 const char *cu_get_comp_dir(Dwarf_Die *cu_die)
66 Dwarf_Attribute attr;
67 if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL)
68 return NULL;
69 return dwarf_formstring(&attr);
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
79 * Find a line number and file name for @addr in @cu_die.
81 int cu_find_lineinfo(Dwarf_Die *cu_die, unsigned long addr,
82 const char **fname, int *lineno)
84 Dwarf_Line *line;
85 Dwarf_Addr laddr;
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;
96 return *lineno ?: -ENOENT;
99 static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data);
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
108 * Walk on function DIEs at given @addr in @cu_die. Passed DIEs
109 * should be subprogram or inlined-subroutines.
111 int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr,
112 int (*callback)(Dwarf_Die *, void *), void *data)
114 Dwarf_Die die_mem;
115 Dwarf_Die *sc_die;
116 int ret = -ENOENT;
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;
128 return ret;
133 * die_compare_name - Compare diename and tname
134 * @dw_die: a DIE
135 * @tname: a string of target name
137 * Compare the name of @dw_die and @tname. Return false if @dw_die has no name.
139 bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
141 const char *name;
143 name = dwarf_diename(dw_die);
144 return name ? (strcmp(tname, name) == 0) : false;
148 * die_match_name - Match diename and glob
149 * @dw_die: a DIE
150 * @glob: a string of target glob pattern
152 * Glob matching the name of @dw_die and @glob. Return false if matching fail.
154 bool die_match_name(Dwarf_Die *dw_die, const char *glob)
156 const char *name;
158 name = dwarf_diename(dw_die);
159 return name ? strglobmatch(name, glob) : false;
163 * die_get_call_lineno - Get callsite line number of inline-function instance
164 * @in_die: a DIE of an inlined function instance
166 * Get call-site line number of @in_die. This means from where the inline
167 * function is called.
169 int die_get_call_lineno(Dwarf_Die *in_die)
171 Dwarf_Attribute attr;
172 Dwarf_Word ret;
174 if (!dwarf_attr(in_die, DW_AT_call_line, &attr))
175 return -ENOENT;
177 dwarf_formudata(&attr, &ret);
178 return (int)ret;
182 * die_get_type - Get type DIE
183 * @vr_die: a DIE of a variable
184 * @die_mem: where to store a type DIE
186 * Get a DIE of the type of given variable (@vr_die), and store
187 * it to die_mem. Return NULL if fails to get a type DIE.
189 Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
191 Dwarf_Attribute attr;
193 if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) &&
194 dwarf_formref_die(&attr, die_mem))
195 return die_mem;
196 else
197 return NULL;
200 /* Get a type die, but skip qualifiers */
201 static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
203 int tag;
205 do {
206 vr_die = die_get_type(vr_die, die_mem);
207 if (!vr_die)
208 break;
209 tag = dwarf_tag(vr_die);
210 } while (tag == DW_TAG_const_type ||
211 tag == DW_TAG_restrict_type ||
212 tag == DW_TAG_volatile_type ||
213 tag == DW_TAG_shared_type);
215 return vr_die;
219 * die_get_real_type - Get a type die, but skip qualifiers and typedef
220 * @vr_die: a DIE of a variable
221 * @die_mem: where to store a type DIE
223 * Get a DIE of the type of given variable (@vr_die), and store
224 * it to die_mem. Return NULL if fails to get a type DIE.
225 * If the type is qualifiers (e.g. const) or typedef, this skips it
226 * and tries to find real type (structure or basic types, e.g. int).
228 Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
230 do {
231 vr_die = __die_get_real_type(vr_die, die_mem);
232 } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef);
234 return vr_die;
237 /* Get attribute and translate it as a udata */
238 static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name,
239 Dwarf_Word *result)
241 Dwarf_Attribute attr;
243 if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
244 dwarf_formudata(&attr, result) != 0)
245 return -ENOENT;
247 return 0;
250 /* Get attribute and translate it as a sdata */
251 static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name,
252 Dwarf_Sword *result)
254 Dwarf_Attribute attr;
256 if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
257 dwarf_formsdata(&attr, result) != 0)
258 return -ENOENT;
260 return 0;
264 * die_is_signed_type - Check whether a type DIE is signed or not
265 * @tp_die: a DIE of a type
267 * Get the encoding of @tp_die and return true if the encoding
268 * is signed.
270 bool die_is_signed_type(Dwarf_Die *tp_die)
272 Dwarf_Word ret;
274 if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret))
275 return false;
277 return (ret == DW_ATE_signed_char || ret == DW_ATE_signed ||
278 ret == DW_ATE_signed_fixed);
282 * die_is_func_def - Ensure that this DIE is a subprogram and definition
283 * @dw_die: a DIE
285 * Ensure that this DIE is a subprogram and NOT a declaration. This
286 * returns true if @dw_die is a function definition.
288 bool die_is_func_def(Dwarf_Die *dw_die)
290 Dwarf_Attribute attr;
292 return (dwarf_tag(dw_die) == DW_TAG_subprogram &&
293 dwarf_attr(dw_die, DW_AT_declaration, &attr) == NULL);
297 * die_is_func_instance - Ensure that this DIE is an instance of a subprogram
298 * @dw_die: a DIE
300 * Ensure that this DIE is an instance (which has an entry address).
301 * This returns true if @dw_die is a function instance. If not, you need to
302 * call die_walk_instances() to find actual instances.
304 bool die_is_func_instance(Dwarf_Die *dw_die)
306 Dwarf_Addr tmp;
308 /* Actually gcc optimizes non-inline as like as inlined */
309 return !dwarf_func_inline(dw_die) && dwarf_entrypc(dw_die, &tmp) == 0;
312 * die_get_data_member_location - Get the data-member offset
313 * @mb_die: a DIE of a member of a data structure
314 * @offs: The offset of the member in the data structure
316 * Get the offset of @mb_die in the data structure including @mb_die, and
317 * stores result offset to @offs. If any error occurs this returns errno.
319 int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs)
321 Dwarf_Attribute attr;
322 Dwarf_Op *expr;
323 size_t nexpr;
324 int ret;
326 if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL)
327 return -ENOENT;
329 if (dwarf_formudata(&attr, offs) != 0) {
330 /* DW_AT_data_member_location should be DW_OP_plus_uconst */
331 ret = dwarf_getlocation(&attr, &expr, &nexpr);
332 if (ret < 0 || nexpr == 0)
333 return -ENOENT;
335 if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) {
336 pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n",
337 expr[0].atom, nexpr);
338 return -ENOTSUP;
340 *offs = (Dwarf_Word)expr[0].number;
342 return 0;
345 /* Get the call file index number in CU DIE */
346 static int die_get_call_fileno(Dwarf_Die *in_die)
348 Dwarf_Sword idx;
350 if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0)
351 return (int)idx;
352 else
353 return -ENOENT;
356 /* Get the declared file index number in CU DIE */
357 static int die_get_decl_fileno(Dwarf_Die *pdie)
359 Dwarf_Sword idx;
361 if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0)
362 return (int)idx;
363 else
364 return -ENOENT;
368 * die_get_call_file - Get callsite file name of inlined function instance
369 * @in_die: a DIE of an inlined function instance
371 * Get call-site file name of @in_die. This means from which file the inline
372 * function is called.
374 const char *die_get_call_file(Dwarf_Die *in_die)
376 Dwarf_Die cu_die;
377 Dwarf_Files *files;
378 int idx;
380 idx = die_get_call_fileno(in_die);
381 if (idx < 0 || !dwarf_diecu(in_die, &cu_die, NULL, NULL) ||
382 dwarf_getsrcfiles(&cu_die, &files, NULL) != 0)
383 return NULL;
385 return dwarf_filesrc(files, idx, NULL, NULL);
390 * die_find_child - Generic DIE search function in DIE tree
391 * @rt_die: a root DIE
392 * @callback: a callback function
393 * @data: a user data passed to the callback function
394 * @die_mem: a buffer for result DIE
396 * Trace DIE tree from @rt_die and call @callback for each child DIE.
397 * If @callback returns DIE_FIND_CB_END, this stores the DIE into
398 * @die_mem and returns it. If @callback returns DIE_FIND_CB_CONTINUE,
399 * this continues to trace the tree. Optionally, @callback can return
400 * DIE_FIND_CB_CHILD and DIE_FIND_CB_SIBLING, those means trace only
401 * the children and trace only the siblings respectively.
402 * Returns NULL if @callback can't find any appropriate DIE.
404 Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
405 int (*callback)(Dwarf_Die *, void *),
406 void *data, Dwarf_Die *die_mem)
408 Dwarf_Die child_die;
409 int ret;
411 ret = dwarf_child(rt_die, die_mem);
412 if (ret != 0)
413 return NULL;
415 do {
416 ret = callback(die_mem, data);
417 if (ret == DIE_FIND_CB_END)
418 return die_mem;
420 if ((ret & DIE_FIND_CB_CHILD) &&
421 die_find_child(die_mem, callback, data, &child_die)) {
422 memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
423 return die_mem;
425 } while ((ret & DIE_FIND_CB_SIBLING) &&
426 dwarf_siblingof(die_mem, die_mem) == 0);
428 return NULL;
431 struct __addr_die_search_param {
432 Dwarf_Addr addr;
433 Dwarf_Die *die_mem;
436 static int __die_search_func_tail_cb(Dwarf_Die *fn_die, void *data)
438 struct __addr_die_search_param *ad = data;
439 Dwarf_Addr addr = 0;
441 if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
442 !dwarf_highpc(fn_die, &addr) &&
443 addr == ad->addr) {
444 memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
445 return DWARF_CB_ABORT;
447 return DWARF_CB_OK;
451 * die_find_tailfunc - Search for a non-inlined function with tail call at
452 * given address
453 * @cu_die: a CU DIE which including @addr
454 * @addr: target address
455 * @die_mem: a buffer for result DIE
457 * Search for a non-inlined function DIE with tail call at @addr. Stores the
458 * DIE to @die_mem and returns it if found. Returns NULL if failed.
460 Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
461 Dwarf_Die *die_mem)
463 struct __addr_die_search_param ad;
464 ad.addr = addr;
465 ad.die_mem = die_mem;
466 /* dwarf_getscopes can't find subprogram. */
467 if (!dwarf_getfuncs(cu_die, __die_search_func_tail_cb, &ad, 0))
468 return NULL;
469 else
470 return die_mem;
473 /* die_find callback for non-inlined function search */
474 static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
476 struct __addr_die_search_param *ad = data;
479 * Since a declaration entry doesn't has given pc, this always returns
480 * function definition entry.
482 if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
483 dwarf_haspc(fn_die, ad->addr)) {
484 memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
485 return DWARF_CB_ABORT;
487 return DWARF_CB_OK;
491 * die_find_realfunc - Search a non-inlined function at given address
492 * @cu_die: a CU DIE which including @addr
493 * @addr: target address
494 * @die_mem: a buffer for result DIE
496 * Search a non-inlined function DIE which includes @addr. Stores the
497 * DIE to @die_mem and returns it if found. Returns NULL if failed.
499 Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
500 Dwarf_Die *die_mem)
502 struct __addr_die_search_param ad;
503 ad.addr = addr;
504 ad.die_mem = die_mem;
505 /* dwarf_getscopes can't find subprogram. */
506 if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0))
507 return NULL;
508 else
509 return die_mem;
512 /* die_find callback for inline function search */
513 static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data)
515 Dwarf_Addr *addr = data;
517 if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine &&
518 dwarf_haspc(die_mem, *addr))
519 return DIE_FIND_CB_END;
521 return DIE_FIND_CB_CONTINUE;
525 * die_find_top_inlinefunc - Search the top inlined function at given address
526 * @sp_die: a subprogram DIE which including @addr
527 * @addr: target address
528 * @die_mem: a buffer for result DIE
530 * Search an inlined function DIE which includes @addr. Stores the
531 * DIE to @die_mem and returns it if found. Returns NULL if failed.
532 * Even if several inlined functions are expanded recursively, this
533 * doesn't trace it down, and returns the topmost one.
535 Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
536 Dwarf_Die *die_mem)
538 return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem);
542 * die_find_inlinefunc - Search an inlined function at given address
543 * @sp_die: a subprogram DIE which including @addr
544 * @addr: target address
545 * @die_mem: a buffer for result DIE
547 * Search an inlined function DIE which includes @addr. Stores the
548 * DIE to @die_mem and returns it if found. Returns NULL if failed.
549 * If several inlined functions are expanded recursively, this trace
550 * it down and returns deepest one.
552 Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
553 Dwarf_Die *die_mem)
555 Dwarf_Die tmp_die;
557 sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die);
558 if (!sp_die)
559 return NULL;
561 /* Inlined function could be recursive. Trace it until fail */
562 while (sp_die) {
563 memcpy(die_mem, sp_die, sizeof(Dwarf_Die));
564 sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr,
565 &tmp_die);
568 return die_mem;
571 struct __instance_walk_param {
572 void *addr;
573 int (*callback)(Dwarf_Die *, void *);
574 void *data;
575 int retval;
578 static int __die_walk_instances_cb(Dwarf_Die *inst, void *data)
580 struct __instance_walk_param *iwp = data;
581 Dwarf_Attribute attr_mem;
582 Dwarf_Die origin_mem;
583 Dwarf_Attribute *attr;
584 Dwarf_Die *origin;
585 int tmp;
587 attr = dwarf_attr(inst, DW_AT_abstract_origin, &attr_mem);
588 if (attr == NULL)
589 return DIE_FIND_CB_CONTINUE;
591 origin = dwarf_formref_die(attr, &origin_mem);
592 if (origin == NULL || origin->addr != iwp->addr)
593 return DIE_FIND_CB_CONTINUE;
595 /* Ignore redundant instances */
596 if (dwarf_tag(inst) == DW_TAG_inlined_subroutine) {
597 dwarf_decl_line(origin, &tmp);
598 if (die_get_call_lineno(inst) == tmp) {
599 tmp = die_get_decl_fileno(origin);
600 if (die_get_call_fileno(inst) == tmp)
601 return DIE_FIND_CB_CONTINUE;
605 iwp->retval = iwp->callback(inst, iwp->data);
607 return (iwp->retval) ? DIE_FIND_CB_END : DIE_FIND_CB_CONTINUE;
611 * die_walk_instances - Walk on instances of given DIE
612 * @or_die: an abstract original DIE
613 * @callback: a callback function which is called with instance DIE
614 * @data: user data
616 * Walk on the instances of give @in_die. @in_die must be an inlined function
617 * declartion. This returns the return value of @callback if it returns
618 * non-zero value, or -ENOENT if there is no instance.
620 int die_walk_instances(Dwarf_Die *or_die, int (*callback)(Dwarf_Die *, void *),
621 void *data)
623 Dwarf_Die cu_die;
624 Dwarf_Die die_mem;
625 struct __instance_walk_param iwp = {
626 .addr = or_die->addr,
627 .callback = callback,
628 .data = data,
629 .retval = -ENOENT,
632 if (dwarf_diecu(or_die, &cu_die, NULL, NULL) == NULL)
633 return -ENOENT;
635 die_find_child(&cu_die, __die_walk_instances_cb, &iwp, &die_mem);
637 return iwp.retval;
640 /* Line walker internal parameters */
641 struct __line_walk_param {
642 bool recursive;
643 line_walk_callback_t callback;
644 void *data;
645 int retval;
648 static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data)
650 struct __line_walk_param *lw = data;
651 Dwarf_Addr addr = 0;
652 const char *fname;
653 int lineno;
655 if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) {
656 fname = die_get_call_file(in_die);
657 lineno = die_get_call_lineno(in_die);
658 if (fname && lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) {
659 lw->retval = lw->callback(fname, lineno, addr, lw->data);
660 if (lw->retval != 0)
661 return DIE_FIND_CB_END;
664 if (!lw->recursive)
665 /* Don't need to search recursively */
666 return DIE_FIND_CB_SIBLING;
668 if (addr) {
669 fname = dwarf_decl_file(in_die);
670 if (fname && dwarf_decl_line(in_die, &lineno) == 0) {
671 lw->retval = lw->callback(fname, lineno, addr, lw->data);
672 if (lw->retval != 0)
673 return DIE_FIND_CB_END;
677 /* Continue to search nested inlined function call-sites */
678 return DIE_FIND_CB_CONTINUE;
681 /* Walk on lines of blocks included in given DIE */
682 static int __die_walk_funclines(Dwarf_Die *sp_die, bool recursive,
683 line_walk_callback_t callback, void *data)
685 struct __line_walk_param lw = {
686 .recursive = recursive,
687 .callback = callback,
688 .data = data,
689 .retval = 0,
691 Dwarf_Die die_mem;
692 Dwarf_Addr addr;
693 const char *fname;
694 int lineno;
696 /* Handle function declaration line */
697 fname = dwarf_decl_file(sp_die);
698 if (fname && dwarf_decl_line(sp_die, &lineno) == 0 &&
699 dwarf_entrypc(sp_die, &addr) == 0) {
700 lw.retval = callback(fname, lineno, addr, data);
701 if (lw.retval != 0)
702 goto done;
704 die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem);
705 done:
706 return lw.retval;
709 static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data)
711 struct __line_walk_param *lw = data;
713 lw->retval = __die_walk_funclines(sp_die, true, lw->callback, lw->data);
714 if (lw->retval != 0)
715 return DWARF_CB_ABORT;
717 return DWARF_CB_OK;
721 * die_walk_lines - Walk on lines inside given DIE
722 * @rt_die: a root DIE (CU, subprogram or inlined_subroutine)
723 * @callback: callback routine
724 * @data: user data
726 * Walk on all lines inside given @rt_die and call @callback on each line.
727 * If the @rt_die is a function, walk only on the lines inside the function,
728 * otherwise @rt_die must be a CU DIE.
729 * Note that this walks not only dwarf line list, but also function entries
730 * and inline call-site.
732 int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data)
734 Dwarf_Lines *lines;
735 Dwarf_Line *line;
736 Dwarf_Addr addr;
737 const char *fname, *decf = NULL;
738 int lineno, ret = 0;
739 int decl = 0, inl;
740 Dwarf_Die die_mem, *cu_die;
741 size_t nlines, i;
743 /* Get the CU die */
744 if (dwarf_tag(rt_die) != DW_TAG_compile_unit) {
745 cu_die = dwarf_diecu(rt_die, &die_mem, NULL, NULL);
746 dwarf_decl_line(rt_die, &decl);
747 decf = dwarf_decl_file(rt_die);
748 } else
749 cu_die = rt_die;
750 if (!cu_die) {
751 pr_debug2("Failed to get CU from given DIE.\n");
752 return -EINVAL;
755 /* Get lines list in the CU */
756 if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) {
757 pr_debug2("Failed to get source lines on this CU.\n");
758 return -ENOENT;
760 pr_debug2("Get %zd lines from this CU\n", nlines);
762 /* Walk on the lines on lines list */
763 for (i = 0; i < nlines; i++) {
764 line = dwarf_onesrcline(lines, i);
765 if (line == NULL ||
766 dwarf_lineno(line, &lineno) != 0 ||
767 dwarf_lineaddr(line, &addr) != 0) {
768 pr_debug2("Failed to get line info. "
769 "Possible error in debuginfo.\n");
770 continue;
772 /* Filter lines based on address */
773 if (rt_die != cu_die) {
775 * Address filtering
776 * The line is included in given function, and
777 * no inline block includes it.
779 if (!dwarf_haspc(rt_die, addr))
780 continue;
781 if (die_find_inlinefunc(rt_die, addr, &die_mem)) {
782 dwarf_decl_line(&die_mem, &inl);
783 if (inl != decl ||
784 decf != dwarf_decl_file(&die_mem))
785 continue;
788 /* Get source line */
789 fname = dwarf_linesrc(line, NULL, NULL);
791 ret = callback(fname, lineno, addr, data);
792 if (ret != 0)
793 return ret;
797 * Dwarf lines doesn't include function declarations and inlined
798 * subroutines. We have to check functions list or given function.
800 if (rt_die != cu_die)
802 * Don't need walk functions recursively, because nested
803 * inlined functions don't have lines of the specified DIE.
805 ret = __die_walk_funclines(rt_die, false, callback, data);
806 else {
807 struct __line_walk_param param = {
808 .callback = callback,
809 .data = data,
810 .retval = 0,
812 dwarf_getfuncs(cu_die, __die_walk_culines_cb, &param, 0);
813 ret = param.retval;
816 return ret;
819 struct __find_variable_param {
820 const char *name;
821 Dwarf_Addr addr;
824 static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data)
826 struct __find_variable_param *fvp = data;
827 Dwarf_Attribute attr;
828 int tag;
830 tag = dwarf_tag(die_mem);
831 if ((tag == DW_TAG_formal_parameter ||
832 tag == DW_TAG_variable) &&
833 die_compare_name(die_mem, fvp->name) &&
834 /* Does the DIE have location information or external instance? */
835 (dwarf_attr(die_mem, DW_AT_external, &attr) ||
836 dwarf_attr(die_mem, DW_AT_location, &attr)))
837 return DIE_FIND_CB_END;
838 if (dwarf_haspc(die_mem, fvp->addr))
839 return DIE_FIND_CB_CONTINUE;
840 else
841 return DIE_FIND_CB_SIBLING;
845 * die_find_variable_at - Find a given name variable at given address
846 * @sp_die: a function DIE
847 * @name: variable name
848 * @addr: address
849 * @die_mem: a buffer for result DIE
851 * Find a variable DIE called @name at @addr in @sp_die.
853 Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
854 Dwarf_Addr addr, Dwarf_Die *die_mem)
856 struct __find_variable_param fvp = { .name = name, .addr = addr};
858 return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp,
859 die_mem);
862 static int __die_find_member_cb(Dwarf_Die *die_mem, void *data)
864 const char *name = data;
866 if (dwarf_tag(die_mem) == DW_TAG_member) {
867 if (die_compare_name(die_mem, name))
868 return DIE_FIND_CB_END;
869 else if (!dwarf_diename(die_mem)) { /* Unnamed structure */
870 Dwarf_Die type_die, tmp_die;
871 if (die_get_type(die_mem, &type_die) &&
872 die_find_member(&type_die, name, &tmp_die))
873 return DIE_FIND_CB_END;
876 return DIE_FIND_CB_SIBLING;
880 * die_find_member - Find a given name member in a data structure
881 * @st_die: a data structure type DIE
882 * @name: member name
883 * @die_mem: a buffer for result DIE
885 * Find a member DIE called @name in @st_die.
887 Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
888 Dwarf_Die *die_mem)
890 return die_find_child(st_die, __die_find_member_cb, (void *)name,
891 die_mem);
895 * die_get_typename - Get the name of given variable DIE
896 * @vr_die: a variable DIE
897 * @buf: a strbuf for result type name
899 * Get the name of @vr_die and stores it to @buf. Return 0 if succeeded.
900 * and Return -ENOENT if failed to find type name.
901 * Note that the result will stores typedef name if possible, and stores
902 * "*(function_type)" if the type is a function pointer.
904 int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
906 Dwarf_Die type;
907 int tag, ret;
908 const char *tmp = "";
910 if (__die_get_real_type(vr_die, &type) == NULL)
911 return -ENOENT;
913 tag = dwarf_tag(&type);
914 if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)
915 tmp = "*";
916 else if (tag == DW_TAG_subroutine_type) {
917 /* Function pointer */
918 strbuf_addf(buf, "(function_type)");
919 return 0;
920 } else {
921 if (!dwarf_diename(&type))
922 return -ENOENT;
923 if (tag == DW_TAG_union_type)
924 tmp = "union ";
925 else if (tag == DW_TAG_structure_type)
926 tmp = "struct ";
927 else if (tag == DW_TAG_enumeration_type)
928 tmp = "enum ";
929 /* Write a base name */
930 strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
931 return 0;
933 ret = die_get_typename(&type, buf);
934 if (ret == 0)
935 strbuf_addf(buf, "%s", tmp);
937 return ret;
941 * die_get_varname - Get the name and type of given variable DIE
942 * @vr_die: a variable DIE
943 * @buf: a strbuf for type and variable name
945 * Get the name and type of @vr_die and stores it in @buf as "type\tname".
947 int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
949 int ret;
951 ret = die_get_typename(vr_die, buf);
952 if (ret < 0) {
953 pr_debug("Failed to get type, make it unknown.\n");
954 strbuf_addf(buf, "(unknown_type)");
957 strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
959 return 0;
963 * die_get_var_innermost_scope - Get innermost scope range of given variable DIE
964 * @sp_die: a subprogram DIE
965 * @vr_die: a variable DIE
966 * @buf: a strbuf for variable byte offset range
968 * Get the innermost scope range of @vr_die and stores it in @buf as
969 * "@<function_name+[NN-NN,NN-NN]>".
971 static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die,
972 struct strbuf *buf)
974 Dwarf_Die *scopes;
975 int count;
976 size_t offset = 0;
977 Dwarf_Addr base;
978 Dwarf_Addr start, end;
979 Dwarf_Addr entry;
980 int ret;
981 bool first = true;
982 const char *name;
984 ret = dwarf_entrypc(sp_die, &entry);
985 if (ret)
986 return ret;
988 name = dwarf_diename(sp_die);
989 if (!name)
990 return -ENOENT;
992 count = dwarf_getscopes_die(vr_die, &scopes);
994 /* (*SCOPES)[1] is the DIE for the scope containing that scope */
995 if (count <= 1) {
996 ret = -EINVAL;
997 goto out;
1000 while ((offset = dwarf_ranges(&scopes[1], offset, &base,
1001 &start, &end)) > 0) {
1002 start -= entry;
1003 end -= entry;
1005 if (first) {
1006 strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
1007 name, start, end);
1008 first = false;
1009 } else {
1010 strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
1011 start, end);
1015 if (!first)
1016 strbuf_addf(buf, "]>");
1018 out:
1019 free(scopes);
1020 return ret;
1024 * die_get_var_range - Get byte offset range of given variable DIE
1025 * @sp_die: a subprogram DIE
1026 * @vr_die: a variable DIE
1027 * @buf: a strbuf for type and variable name and byte offset range
1029 * Get the byte offset range of @vr_die and stores it in @buf as
1030 * "@<function_name+[NN-NN,NN-NN]>".
1032 int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
1034 int ret = 0;
1035 Dwarf_Addr base;
1036 Dwarf_Addr start, end;
1037 Dwarf_Addr entry;
1038 Dwarf_Op *op;
1039 size_t nops;
1040 size_t offset = 0;
1041 Dwarf_Attribute attr;
1042 bool first = true;
1043 const char *name;
1045 ret = dwarf_entrypc(sp_die, &entry);
1046 if (ret)
1047 return ret;
1049 name = dwarf_diename(sp_die);
1050 if (!name)
1051 return -ENOENT;
1053 if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
1054 return -EINVAL;
1056 while ((offset = dwarf_getlocations(
1057 &attr, offset, &base,
1058 &start, &end, &op, &nops)) > 0) {
1059 if (start == 0) {
1060 /* Single Location Descriptions */
1061 ret = die_get_var_innermost_scope(sp_die, vr_die, buf);
1062 return ret;
1065 /* Location Lists */
1066 start -= entry;
1067 end -= entry;
1068 if (first) {
1069 strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
1070 name, start, end);
1071 first = false;
1072 } else {
1073 strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
1074 start, end);
1078 if (!first)
1079 strbuf_addf(buf, "]>");
1081 return ret;