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.
23 #include "dwarf-aux.h"
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)
36 const char *src = NULL;
42 ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
46 for (i = 0; i < nfiles; i++) {
47 src = dwarf_filesrc(files, i, NULL, NULL);
48 if (strtailcmp(src, fname) == 0)
57 * cu_get_comp_dir - Get the path of compilation directory
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)
67 if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL)
69 return dwarf_formstring(&attr);
73 * cu_find_lineinfo - Get a line number and file name for given 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)
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);
92 /* line number is useless without filename */
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
105 * @callback: A callback which called with found DIEs
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)
118 /* Inlined function could be recursive. Trace it until fail */
119 for (sc_die = die_find_realfunc(cu_die, addr, &die_mem);
121 sc_die = die_find_child(sc_die, __die_find_inline_cb, &addr,
123 ret = callback(sc_die, data);
133 * die_compare_name - Compare diename and tname
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)
143 name = dwarf_diename(dw_die);
144 return name ? (strcmp(tname, name) == 0) : false;
148 * die_match_name - Match diename and glob
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)
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;
174 if (!dwarf_attr(in_die, DW_AT_call_line, &attr))
177 dwarf_formudata(&attr, &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))
200 /* Get a type die, but skip qualifiers */
201 static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
206 vr_die = die_get_type(vr_die, die_mem);
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);
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)
231 vr_die = __die_get_real_type(vr_die, die_mem);
232 } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef);
237 /* Get attribute and translate it as a udata */
238 static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name,
241 Dwarf_Attribute attr;
243 if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
244 dwarf_formudata(&attr, result) != 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,
254 Dwarf_Attribute attr;
256 if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
257 dwarf_formsdata(&attr, result) != 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
270 bool die_is_signed_type(Dwarf_Die *tp_die)
274 if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret))
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
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_entrypc - Returns entry PC (the lowest address) of a DIE
299 * @addr: where to store entry PC
301 * Since dwarf_entrypc() does not return entry PC if the DIE has only address
302 * range, we have to use this to retrieve the lowest address from the address
305 int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr)
307 Dwarf_Addr base, end;
308 Dwarf_Attribute attr;
313 if (dwarf_entrypc(dw_die, addr) == 0)
317 * Since the dwarf_ranges() will return 0 if there is no
318 * DW_AT_ranges attribute, we should check it first.
320 if (!dwarf_attr(dw_die, DW_AT_ranges, &attr))
323 return dwarf_ranges(dw_die, 0, &base, addr, &end) < 0 ? -ENOENT : 0;
327 * die_is_func_instance - Ensure that this DIE is an instance of a subprogram
330 * Ensure that this DIE is an instance (which has an entry address).
331 * This returns true if @dw_die is a function instance. If not, the @dw_die
332 * must be a prototype. You can use die_walk_instances() to find actual
335 bool die_is_func_instance(Dwarf_Die *dw_die)
338 Dwarf_Attribute attr_mem;
339 int tag = dwarf_tag(dw_die);
341 if (tag != DW_TAG_subprogram &&
342 tag != DW_TAG_inlined_subroutine)
345 return dwarf_entrypc(dw_die, &tmp) == 0 ||
346 dwarf_attr(dw_die, DW_AT_ranges, &attr_mem) != NULL;
350 * die_get_data_member_location - Get the data-member offset
351 * @mb_die: a DIE of a member of a data structure
352 * @offs: The offset of the member in the data structure
354 * Get the offset of @mb_die in the data structure including @mb_die, and
355 * stores result offset to @offs. If any error occurs this returns errno.
357 int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs)
359 Dwarf_Attribute attr;
364 if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL)
367 if (dwarf_formudata(&attr, offs) != 0) {
368 /* DW_AT_data_member_location should be DW_OP_plus_uconst */
369 ret = dwarf_getlocation(&attr, &expr, &nexpr);
370 if (ret < 0 || nexpr == 0)
373 if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) {
374 pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n",
375 expr[0].atom, nexpr);
378 *offs = (Dwarf_Word)expr[0].number;
383 /* Get the call file index number in CU DIE */
384 static int die_get_call_fileno(Dwarf_Die *in_die)
388 if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0)
394 /* Get the declared file index number in CU DIE */
395 static int die_get_decl_fileno(Dwarf_Die *pdie)
399 if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0)
406 * die_get_call_file - Get callsite file name of inlined function instance
407 * @in_die: a DIE of an inlined function instance
409 * Get call-site file name of @in_die. This means from which file the inline
410 * function is called.
412 const char *die_get_call_file(Dwarf_Die *in_die)
418 idx = die_get_call_fileno(in_die);
419 if (idx < 0 || !dwarf_diecu(in_die, &cu_die, NULL, NULL) ||
420 dwarf_getsrcfiles(&cu_die, &files, NULL) != 0)
423 return dwarf_filesrc(files, idx, NULL, NULL);
428 * die_find_child - Generic DIE search function in DIE tree
429 * @rt_die: a root DIE
430 * @callback: a callback function
431 * @data: a user data passed to the callback function
432 * @die_mem: a buffer for result DIE
434 * Trace DIE tree from @rt_die and call @callback for each child DIE.
435 * If @callback returns DIE_FIND_CB_END, this stores the DIE into
436 * @die_mem and returns it. If @callback returns DIE_FIND_CB_CONTINUE,
437 * this continues to trace the tree. Optionally, @callback can return
438 * DIE_FIND_CB_CHILD and DIE_FIND_CB_SIBLING, those means trace only
439 * the children and trace only the siblings respectively.
440 * Returns NULL if @callback can't find any appropriate DIE.
442 Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
443 int (*callback)(Dwarf_Die *, void *),
444 void *data, Dwarf_Die *die_mem)
449 ret = dwarf_child(rt_die, die_mem);
454 ret = callback(die_mem, data);
455 if (ret == DIE_FIND_CB_END)
458 if ((ret & DIE_FIND_CB_CHILD) &&
459 die_find_child(die_mem, callback, data, &child_die)) {
460 memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
463 } while ((ret & DIE_FIND_CB_SIBLING) &&
464 dwarf_siblingof(die_mem, die_mem) == 0);
469 struct __addr_die_search_param {
474 static int __die_search_func_tail_cb(Dwarf_Die *fn_die, void *data)
476 struct __addr_die_search_param *ad = data;
479 if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
480 !dwarf_highpc(fn_die, &addr) &&
482 memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
483 return DWARF_CB_ABORT;
489 * die_find_tailfunc - Search for a non-inlined function with tail call at
491 * @cu_die: a CU DIE which including @addr
492 * @addr: target address
493 * @die_mem: a buffer for result DIE
495 * Search for a non-inlined function DIE with tail call at @addr. Stores the
496 * DIE to @die_mem and returns it if found. Returns NULL if failed.
498 Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
501 struct __addr_die_search_param ad;
503 ad.die_mem = die_mem;
504 /* dwarf_getscopes can't find subprogram. */
505 if (!dwarf_getfuncs(cu_die, __die_search_func_tail_cb, &ad, 0))
511 /* die_find callback for non-inlined function search */
512 static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
514 struct __addr_die_search_param *ad = data;
517 * Since a declaration entry doesn't has given pc, this always returns
518 * function definition entry.
520 if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
521 dwarf_haspc(fn_die, ad->addr)) {
522 memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
523 return DWARF_CB_ABORT;
529 * die_find_realfunc - Search a non-inlined function at given address
530 * @cu_die: a CU DIE which including @addr
531 * @addr: target address
532 * @die_mem: a buffer for result DIE
534 * Search a non-inlined function DIE which includes @addr. Stores the
535 * DIE to @die_mem and returns it if found. Returns NULL if failed.
537 Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
540 struct __addr_die_search_param ad;
542 ad.die_mem = die_mem;
543 /* dwarf_getscopes can't find subprogram. */
544 if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0))
550 /* die_find callback for inline function search */
551 static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data)
553 Dwarf_Addr *addr = data;
555 if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine &&
556 dwarf_haspc(die_mem, *addr))
557 return DIE_FIND_CB_END;
559 return DIE_FIND_CB_CONTINUE;
563 * die_find_top_inlinefunc - Search the top inlined function at given address
564 * @sp_die: a subprogram DIE which including @addr
565 * @addr: target address
566 * @die_mem: a buffer for result DIE
568 * Search an inlined function DIE which includes @addr. Stores the
569 * DIE to @die_mem and returns it if found. Returns NULL if failed.
570 * Even if several inlined functions are expanded recursively, this
571 * doesn't trace it down, and returns the topmost one.
573 Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
576 return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem);
580 * die_find_inlinefunc - Search an inlined function at given address
581 * @sp_die: a subprogram DIE which including @addr
582 * @addr: target address
583 * @die_mem: a buffer for result DIE
585 * Search an inlined function DIE which includes @addr. Stores the
586 * DIE to @die_mem and returns it if found. Returns NULL if failed.
587 * If several inlined functions are expanded recursively, this trace
588 * it down and returns deepest one.
590 Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
595 sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die);
599 /* Inlined function could be recursive. Trace it until fail */
601 memcpy(die_mem, sp_die, sizeof(Dwarf_Die));
602 sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr,
609 struct __instance_walk_param {
611 int (*callback)(Dwarf_Die *, void *);
616 static int __die_walk_instances_cb(Dwarf_Die *inst, void *data)
618 struct __instance_walk_param *iwp = data;
619 Dwarf_Attribute attr_mem;
620 Dwarf_Die origin_mem;
621 Dwarf_Attribute *attr;
625 if (!die_is_func_instance(inst))
626 return DIE_FIND_CB_CONTINUE;
628 attr = dwarf_attr(inst, DW_AT_abstract_origin, &attr_mem);
630 return DIE_FIND_CB_CONTINUE;
632 origin = dwarf_formref_die(attr, &origin_mem);
633 if (origin == NULL || origin->addr != iwp->addr)
634 return DIE_FIND_CB_CONTINUE;
636 /* Ignore redundant instances */
637 if (dwarf_tag(inst) == DW_TAG_inlined_subroutine) {
638 dwarf_decl_line(origin, &tmp);
639 if (die_get_call_lineno(inst) == tmp) {
640 tmp = die_get_decl_fileno(origin);
641 if (die_get_call_fileno(inst) == tmp)
642 return DIE_FIND_CB_CONTINUE;
646 iwp->retval = iwp->callback(inst, iwp->data);
648 return (iwp->retval) ? DIE_FIND_CB_END : DIE_FIND_CB_CONTINUE;
652 * die_walk_instances - Walk on instances of given DIE
653 * @or_die: an abstract original DIE
654 * @callback: a callback function which is called with instance DIE
657 * Walk on the instances of give @in_die. @in_die must be an inlined function
658 * declartion. This returns the return value of @callback if it returns
659 * non-zero value, or -ENOENT if there is no instance.
661 int die_walk_instances(Dwarf_Die *or_die, int (*callback)(Dwarf_Die *, void *),
666 struct __instance_walk_param iwp = {
667 .addr = or_die->addr,
668 .callback = callback,
673 if (dwarf_diecu(or_die, &cu_die, NULL, NULL) == NULL)
676 die_find_child(&cu_die, __die_walk_instances_cb, &iwp, &die_mem);
681 /* Line walker internal parameters */
682 struct __line_walk_param {
684 line_walk_callback_t callback;
689 static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data)
691 struct __line_walk_param *lw = data;
696 if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) {
697 fname = die_get_call_file(in_die);
698 lineno = die_get_call_lineno(in_die);
699 if (fname && lineno > 0 && die_entrypc(in_die, &addr) == 0) {
700 lw->retval = lw->callback(fname, lineno, addr, lw->data);
702 return DIE_FIND_CB_END;
705 return DIE_FIND_CB_SIBLING;
709 fname = dwarf_decl_file(in_die);
710 if (fname && dwarf_decl_line(in_die, &lineno) == 0) {
711 lw->retval = lw->callback(fname, lineno, addr, lw->data);
713 return DIE_FIND_CB_END;
717 /* Continue to search nested inlined function call-sites */
718 return DIE_FIND_CB_CONTINUE;
721 /* Walk on lines of blocks included in given DIE */
722 static int __die_walk_funclines(Dwarf_Die *sp_die, bool recursive,
723 line_walk_callback_t callback, void *data)
725 struct __line_walk_param lw = {
726 .recursive = recursive,
727 .callback = callback,
736 /* Handle function declaration line */
737 fname = dwarf_decl_file(sp_die);
738 if (fname && dwarf_decl_line(sp_die, &lineno) == 0 &&
739 die_entrypc(sp_die, &addr) == 0) {
740 lw.retval = callback(fname, lineno, addr, data);
744 die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem);
749 static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data)
751 struct __line_walk_param *lw = data;
754 * Since inlined function can include another inlined function in
755 * the same file, we need to walk in it recursively.
757 lw->retval = __die_walk_funclines(sp_die, true, lw->callback, lw->data);
759 return DWARF_CB_ABORT;
765 * die_walk_lines - Walk on lines inside given DIE
766 * @rt_die: a root DIE (CU, subprogram or inlined_subroutine)
767 * @callback: callback routine
770 * Walk on all lines inside given @rt_die and call @callback on each line.
771 * If the @rt_die is a function, walk only on the lines inside the function,
772 * otherwise @rt_die must be a CU DIE.
773 * Note that this walks not only dwarf line list, but also function entries
774 * and inline call-site.
776 int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data)
781 const char *fname, *decf = NULL, *inf = NULL;
784 Dwarf_Die die_mem, *cu_die;
789 if (dwarf_tag(rt_die) != DW_TAG_compile_unit) {
790 cu_die = dwarf_diecu(rt_die, &die_mem, NULL, NULL);
791 dwarf_decl_line(rt_die, &decl);
792 decf = dwarf_decl_file(rt_die);
796 pr_debug2("Failed to get CU from given DIE.\n");
800 /* Get lines list in the CU */
801 if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) {
802 pr_debug2("Failed to get source lines on this CU.\n");
805 pr_debug2("Get %zd lines from this CU\n", nlines);
807 /* Walk on the lines on lines list */
808 for (i = 0; i < nlines; i++) {
809 line = dwarf_onesrcline(lines, i);
811 dwarf_lineno(line, &lineno) != 0 ||
812 dwarf_lineaddr(line, &addr) != 0) {
813 pr_debug2("Failed to get line info. "
814 "Possible error in debuginfo.\n");
817 /* Skip end-of-sequence */
818 if (dwarf_lineendsequence(line, &flag) != 0 || flag)
820 /* Skip Non statement line-info */
821 if (dwarf_linebeginstatement(line, &flag) != 0 || !flag)
823 /* Filter lines based on address */
824 if (rt_die != cu_die) {
827 * The line is included in given function, and
828 * no inline block includes it.
830 if (!dwarf_haspc(rt_die, addr))
833 if (die_find_inlinefunc(rt_die, addr, &die_mem)) {
834 /* Call-site check */
835 inf = die_get_call_file(&die_mem);
836 if ((inf && !strcmp(inf, decf)) &&
837 die_get_call_lineno(&die_mem) == lineno)
840 dwarf_decl_line(&die_mem, &inl);
842 decf != dwarf_decl_file(&die_mem))
847 /* Get source line */
848 fname = dwarf_linesrc(line, NULL, NULL);
850 ret = callback(fname, lineno, addr, data);
856 * Dwarf lines doesn't include function declarations and inlined
857 * subroutines. We have to check functions list or given function.
859 if (rt_die != cu_die)
861 * Don't need walk inlined functions recursively, because
862 * inner inlined functions don't have the lines of the
863 * specified function.
865 ret = __die_walk_funclines(rt_die, false, callback, data);
867 struct __line_walk_param param = {
868 .callback = callback,
872 dwarf_getfuncs(cu_die, __die_walk_culines_cb, ¶m, 0);
879 struct __find_variable_param {
884 static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data)
886 struct __find_variable_param *fvp = data;
887 Dwarf_Attribute attr;
890 tag = dwarf_tag(die_mem);
891 if ((tag == DW_TAG_formal_parameter ||
892 tag == DW_TAG_variable) &&
893 die_compare_name(die_mem, fvp->name) &&
894 /* Does the DIE have location information or external instance? */
895 (dwarf_attr(die_mem, DW_AT_external, &attr) ||
896 dwarf_attr(die_mem, DW_AT_location, &attr)))
897 return DIE_FIND_CB_END;
898 if (dwarf_haspc(die_mem, fvp->addr))
899 return DIE_FIND_CB_CONTINUE;
901 return DIE_FIND_CB_SIBLING;
905 * die_find_variable_at - Find a given name variable at given address
906 * @sp_die: a function DIE
907 * @name: variable name
909 * @die_mem: a buffer for result DIE
911 * Find a variable DIE called @name at @addr in @sp_die.
913 Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
914 Dwarf_Addr addr, Dwarf_Die *die_mem)
916 struct __find_variable_param fvp = { .name = name, .addr = addr};
918 return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp,
922 static int __die_find_member_cb(Dwarf_Die *die_mem, void *data)
924 const char *name = data;
926 if (dwarf_tag(die_mem) == DW_TAG_member) {
927 if (die_compare_name(die_mem, name))
928 return DIE_FIND_CB_END;
929 else if (!dwarf_diename(die_mem)) { /* Unnamed structure */
930 Dwarf_Die type_die, tmp_die;
931 if (die_get_type(die_mem, &type_die) &&
932 die_find_member(&type_die, name, &tmp_die))
933 return DIE_FIND_CB_END;
936 return DIE_FIND_CB_SIBLING;
940 * die_find_member - Find a given name member in a data structure
941 * @st_die: a data structure type DIE
943 * @die_mem: a buffer for result DIE
945 * Find a member DIE called @name in @st_die.
947 Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
950 return die_find_child(st_die, __die_find_member_cb, (void *)name,
955 * die_get_typename - Get the name of given variable DIE
956 * @vr_die: a variable DIE
957 * @buf: a strbuf for result type name
959 * Get the name of @vr_die and stores it to @buf. Return 0 if succeeded.
960 * and Return -ENOENT if failed to find type name.
961 * Note that the result will stores typedef name if possible, and stores
962 * "*(function_type)" if the type is a function pointer.
964 int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
968 const char *tmp = "";
970 if (__die_get_real_type(vr_die, &type) == NULL)
973 tag = dwarf_tag(&type);
974 if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)
976 else if (tag == DW_TAG_subroutine_type) {
977 /* Function pointer */
978 strbuf_addf(buf, "(function_type)");
981 if (!dwarf_diename(&type))
983 if (tag == DW_TAG_union_type)
985 else if (tag == DW_TAG_structure_type)
987 else if (tag == DW_TAG_enumeration_type)
989 /* Write a base name */
990 strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
993 ret = die_get_typename(&type, buf);
995 strbuf_addf(buf, "%s", tmp);
1001 * die_get_varname - Get the name and type of given variable DIE
1002 * @vr_die: a variable DIE
1003 * @buf: a strbuf for type and variable name
1005 * Get the name and type of @vr_die and stores it in @buf as "type\tname".
1007 int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
1011 ret = die_get_typename(vr_die, buf);
1013 pr_debug("Failed to get type, make it unknown.\n");
1014 strbuf_addf(buf, "(unknown_type)");
1017 strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
1023 * die_get_var_innermost_scope - Get innermost scope range of given variable DIE
1024 * @sp_die: a subprogram DIE
1025 * @vr_die: a variable DIE
1026 * @buf: a strbuf for variable byte offset range
1028 * Get the innermost scope range of @vr_die and stores it in @buf as
1029 * "@<function_name+[NN-NN,NN-NN]>".
1031 static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die,
1038 Dwarf_Addr start, end;
1044 ret = die_entrypc(sp_die, &entry);
1048 name = dwarf_diename(sp_die);
1052 count = dwarf_getscopes_die(vr_die, &scopes);
1054 /* (*SCOPES)[1] is the DIE for the scope containing that scope */
1060 while ((offset = dwarf_ranges(&scopes[1], offset, &base,
1061 &start, &end)) > 0) {
1066 strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
1070 strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
1076 strbuf_addf(buf, "]>");
1084 * die_get_var_range - Get byte offset range of given variable DIE
1085 * @sp_die: a subprogram DIE
1086 * @vr_die: a variable DIE
1087 * @buf: a strbuf for type and variable name and byte offset range
1089 * Get the byte offset range of @vr_die and stores it in @buf as
1090 * "@<function_name+[NN-NN,NN-NN]>".
1092 int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
1096 Dwarf_Addr start, end;
1101 Dwarf_Attribute attr;
1105 ret = die_entrypc(sp_die, &entry);
1109 name = dwarf_diename(sp_die);
1113 if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
1116 while ((offset = dwarf_getlocations(
1117 &attr, offset, &base,
1118 &start, &end, &op, &nops)) > 0) {
1120 /* Single Location Descriptions */
1121 ret = die_get_var_innermost_scope(sp_die, vr_die, buf);
1125 /* Location Lists */
1129 strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
1133 strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
1139 strbuf_addf(buf, "]>");