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_is_func_instance - Ensure that this DIE is an instance of a subprogram
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
)
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
;
326 if (dwarf_attr(mb_die
, DW_AT_data_member_location
, &attr
) == NULL
)
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)
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
);
340 *offs
= (Dwarf_Word
)expr
[0].number
;
345 /* Get the call file index number in CU DIE */
346 static int die_get_call_fileno(Dwarf_Die
*in_die
)
350 if (die_get_attr_sdata(in_die
, DW_AT_call_file
, &idx
) == 0)
356 /* Get the declared file index number in CU DIE */
357 static int die_get_decl_fileno(Dwarf_Die
*pdie
)
361 if (die_get_attr_sdata(pdie
, DW_AT_decl_file
, &idx
) == 0)
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
)
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)
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
)
411 ret
= dwarf_child(rt_die
, die_mem
);
416 ret
= callback(die_mem
, data
);
417 if (ret
== DIE_FIND_CB_END
)
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
));
425 } while ((ret
& DIE_FIND_CB_SIBLING
) &&
426 dwarf_siblingof(die_mem
, die_mem
) == 0);
431 struct __addr_die_search_param
{
436 static int __die_search_func_tail_cb(Dwarf_Die
*fn_die
, void *data
)
438 struct __addr_die_search_param
*ad
= data
;
441 if (dwarf_tag(fn_die
) == DW_TAG_subprogram
&&
442 !dwarf_highpc(fn_die
, &addr
) &&
444 memcpy(ad
->die_mem
, fn_die
, sizeof(Dwarf_Die
));
445 return DWARF_CB_ABORT
;
451 * die_find_tailfunc - Search for a non-inlined function with tail call at
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
,
463 struct __addr_die_search_param ad
;
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))
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
;
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
,
502 struct __addr_die_search_param ad
;
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))
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
,
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
,
557 sp_die
= die_find_child(sp_die
, __die_find_inline_cb
, &addr
, &tmp_die
);
561 /* Inlined function could be recursive. Trace it until fail */
563 memcpy(die_mem
, sp_die
, sizeof(Dwarf_Die
));
564 sp_die
= die_find_child(sp_die
, __die_find_inline_cb
, &addr
,
571 struct __instance_walk_param
{
573 int (*callback
)(Dwarf_Die
*, void *);
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
;
587 attr
= dwarf_attr(inst
, DW_AT_abstract_origin
, &attr_mem
);
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
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 *),
625 struct __instance_walk_param iwp
= {
626 .addr
= or_die
->addr
,
627 .callback
= callback
,
632 if (dwarf_diecu(or_die
, &cu_die
, NULL
, NULL
) == NULL
)
635 die_find_child(&cu_die
, __die_walk_instances_cb
, &iwp
, &die_mem
);
640 /* Line walker internal parameters */
641 struct __line_walk_param
{
643 line_walk_callback_t callback
;
648 static int __die_walk_funclines_cb(Dwarf_Die
*in_die
, void *data
)
650 struct __line_walk_param
*lw
= data
;
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
);
661 return DIE_FIND_CB_END
;
665 /* Don't need to search recursively */
666 return DIE_FIND_CB_SIBLING
;
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
);
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
,
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
);
704 die_find_child(sp_die
, __die_walk_funclines_cb
, &lw
, &die_mem
);
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
);
715 return DWARF_CB_ABORT
;
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
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
)
737 const char *fname
, *decf
= NULL
;
740 Dwarf_Die die_mem
, *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
);
751 pr_debug2("Failed to get CU from given DIE.\n");
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");
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
);
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");
772 /* Filter lines based on address */
773 if (rt_die
!= cu_die
) {
776 * The line is included in given function, and
777 * no inline block includes it.
779 if (!dwarf_haspc(rt_die
, addr
))
781 if (die_find_inlinefunc(rt_die
, addr
, &die_mem
)) {
782 dwarf_decl_line(&die_mem
, &inl
);
784 decf
!= dwarf_decl_file(&die_mem
))
788 /* Get source line */
789 fname
= dwarf_linesrc(line
, NULL
, NULL
);
791 ret
= callback(fname
, lineno
, addr
, data
);
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
);
807 struct __line_walk_param param
= {
808 .callback
= callback
,
812 dwarf_getfuncs(cu_die
, __die_walk_culines_cb
, ¶m
, 0);
819 struct __find_variable_param
{
824 static int __die_find_variable_cb(Dwarf_Die
*die_mem
, void *data
)
826 struct __find_variable_param
*fvp
= data
;
827 Dwarf_Attribute attr
;
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
;
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
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
,
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
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
,
890 return die_find_child(st_die
, __die_find_member_cb
, (void *)name
,
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
)
908 const char *tmp
= "";
910 if (__die_get_real_type(vr_die
, &type
) == NULL
)
913 tag
= dwarf_tag(&type
);
914 if (tag
== DW_TAG_array_type
|| tag
== DW_TAG_pointer_type
)
916 else if (tag
== DW_TAG_subroutine_type
) {
917 /* Function pointer */
918 strbuf_addf(buf
, "(function_type)");
921 if (!dwarf_diename(&type
))
923 if (tag
== DW_TAG_union_type
)
925 else if (tag
== DW_TAG_structure_type
)
927 else if (tag
== DW_TAG_enumeration_type
)
929 /* Write a base name */
930 strbuf_addf(buf
, "%s%s", tmp
, dwarf_diename(&type
));
933 ret
= die_get_typename(&type
, buf
);
935 strbuf_addf(buf
, "%s", tmp
);
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
)
951 ret
= die_get_typename(vr_die
, buf
);
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
));
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
,
978 Dwarf_Addr start
, end
;
984 ret
= dwarf_entrypc(sp_die
, &entry
);
988 name
= dwarf_diename(sp_die
);
992 count
= dwarf_getscopes_die(vr_die
, &scopes
);
994 /* (*SCOPES)[1] is the DIE for the scope containing that scope */
1000 while ((offset
= dwarf_ranges(&scopes
[1], offset
, &base
,
1001 &start
, &end
)) > 0) {
1006 strbuf_addf(buf
, "@<%s+[%" PRIu64
"-%" PRIu64
,
1010 strbuf_addf(buf
, ",%" PRIu64
"-%" PRIu64
,
1016 strbuf_addf(buf
, "]>");
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
)
1036 Dwarf_Addr start
, end
;
1041 Dwarf_Attribute attr
;
1045 ret
= dwarf_entrypc(sp_die
, &entry
);
1049 name
= dwarf_diename(sp_die
);
1053 if (dwarf_attr(vr_die
, DW_AT_location
, &attr
) == NULL
)
1056 while ((offset
= dwarf_getlocations(
1057 &attr
, offset
, &base
,
1058 &start
, &end
, &op
, &nops
)) > 0) {
1060 /* Single Location Descriptions */
1061 ret
= die_get_var_innermost_scope(sp_die
, vr_die
, buf
);
1065 /* Location Lists */
1069 strbuf_addf(buf
, "@<%s+[%" PRIu64
"-%" PRIu64
,
1073 strbuf_addf(buf
, ",%" PRIu64
"-%" PRIu64
,
1079 strbuf_addf(buf
, "]>");