4 * Babeltrace - Executable and Shared Object Debug Info Reader
6 * Copyright 2015 Antoine Busque <abusque@efficios.com>
8 * Author: Antoine Busque <abusque@efficios.com>
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
39 #include <babeltrace/dwarf.h>
40 #include <babeltrace/so-info.h>
41 #include <babeltrace/crc32.h>
42 #include <babeltrace/babeltrace-internal.h>
43 #include <babeltrace/utils.h>
46 * An address printed in hex is at most 20 bytes (16 for 64-bits +
47 * leading 0x + optional leading '+' if addr is an offset + null
50 #define ADDR_STR_LEN 20
53 int so_info_init(void)
57 if (elf_version(EV_CURRENT
) == EV_NONE
) {
58 fprintf(stderr
, "ELF library initialization failed: %s\n",
67 struct so_info
*so_info_create(const char *path
, uint64_t low_addr
,
68 uint64_t memsz
, bool is_pic
)
70 struct so_info
*so
= NULL
;
76 so
= g_new0(struct so_info
, 1);
81 if (opt_debug_info_target_prefix
) {
82 so
->elf_path
= g_build_path("/", opt_debug_info_target_prefix
,
85 so
->elf_path
= strdup(path
);
94 so
->low_addr
= low_addr
;
95 so
->high_addr
= so
->low_addr
+ so
->memsz
;
105 void so_info_destroy(struct so_info
*so
)
111 dwarf_end(so
->dwarf_info
);
114 free(so
->dwarf_path
);
116 free(so
->dbg_link_filename
);
118 elf_end(so
->elf_file
);
128 int so_info_set_build_id(struct so_info
*so
, uint8_t *build_id
,
131 if (!so
|| !build_id
) {
135 so
->build_id
= malloc(build_id_len
);
140 memcpy(so
->build_id
, build_id
, build_id_len
);
141 so
->build_id_len
= build_id_len
;
144 * Reset the is_elf_only flag in case it had been set
145 * previously, because we might find separate debug info using
146 * the new build id information.
148 so
->is_elf_only
= false;
158 int so_info_set_debug_link(struct so_info
*so
, char *filename
, uint32_t crc
)
160 if (!so
|| !filename
) {
164 so
->dbg_link_filename
= strdup(filename
);
165 if (!so
->dbg_link_filename
) {
169 so
->dbg_link_crc
= crc
;
172 * Reset the is_elf_only flag in case it had been set
173 * previously, because we might find separate debug info using
174 * the new build id information.
176 so
->is_elf_only
= false;
186 * Tries to read DWARF info from the location given by path, and
187 * attach it to the given so_info instance if it exists.
189 * @param so so_info instance for which to set DWARF info
190 * @param path Presumed location of the DWARF info
191 * @returns 0 on success, -1 on failure
194 int so_info_set_dwarf_info_from_path(struct so_info
*so
, char *path
)
196 int fd
= -1, ret
= 0;
197 struct bt_dwarf_cu
*cu
= NULL
;
198 Dwarf
*dwarf_info
= NULL
;
204 fd
= open(path
, O_RDONLY
);
209 dwarf_info
= dwarf_begin(fd
, DWARF_C_READ
);
215 * Check if the dwarf info has any CU. If not, the SO's object
216 * file contains no DWARF info.
218 cu
= bt_dwarf_cu_create(dwarf_info
);
223 ret
= bt_dwarf_cu_next(cu
);
229 so
->dwarf_path
= strdup(path
);
230 if (!so
->dwarf_path
) {
233 so
->dwarf_info
= dwarf_info
;
240 dwarf_end(dwarf_info
);
248 * Try to set the dwarf_info for a given so_info instance via the
251 * @param so so_info instance for which to retrieve the
252 * DWARF info via build ID
253 * @returns 0 on success (i.e. dwarf_info set), -1 on failure
256 int so_info_set_dwarf_info_build_id(struct so_info
*so
)
258 int i
= 0, ret
= 0, dbg_dir_trailing_slash
= 0;
259 char *path
= NULL
, *build_id_file
= NULL
;
260 const char *dbg_dir
= NULL
;
261 size_t build_id_file_len
, path_len
;
263 if (!so
|| !so
->build_id
) {
267 dbg_dir
= opt_debug_info_dir
? : DEFAULT_DEBUG_DIR
;
269 dbg_dir_trailing_slash
= dbg_dir
[strlen(dbg_dir
) - 1] == '/';
271 /* 2 characters per byte printed in hex, +2 for '/' and '\0' */
272 build_id_file_len
= (2 * so
->build_id_len
) + 2;
273 build_id_file
= malloc(build_id_file_len
);
274 if (!build_id_file
) {
278 snprintf(build_id_file
, 4, "%02x/", so
->build_id
[0]);
279 for (i
= 1; i
< so
->build_id_len
; ++i
) {
280 int path_idx
= 3 + 2 * (i
- 1);
282 snprintf(&build_id_file
[path_idx
], 3, "%02x", so
->build_id
[i
]);
285 path_len
= strlen(dbg_dir
) + strlen(BUILD_ID_SUBDIR
) +
286 strlen(build_id_file
) + strlen(BUILD_ID_SUFFIX
) + 1;
287 if (!dbg_dir_trailing_slash
) {
291 path
= malloc(path_len
);
296 strcpy(path
, dbg_dir
);
297 if (!dbg_dir_trailing_slash
) {
300 strcat(path
, BUILD_ID_SUBDIR
);
301 strcat(path
, build_id_file
);
302 strcat(path
, BUILD_ID_SUFFIX
);
304 ret
= so_info_set_dwarf_info_from_path(so
, path
);
321 * Tests whether the file located at path exists and has the expected
324 * This predicate is used when looking up separate debug info via the
325 * GNU debuglink method. The expected crc can be found .gnu_debuglink
326 * section in the original ELF file, along with the filename for the
327 * file containing the debug info.
329 * @param path Full path at which to look for the debug file
330 * @param crc Expected checksum for the debug file
331 * @returns 1 if the file exists and has the correct checksum,
335 int is_valid_debug_file(char *path
, uint32_t crc
)
337 int ret
= 0, fd
= -1;
344 fd
= open(path
, O_RDONLY
);
349 ret
= crc32(fd
, &_crc
);
363 * Try to set the dwarf_info for a given so_info instance via the
366 * @param so so_info instance for which to retrieve the
367 * DWARF info via debug link
368 * @returns 0 on success (i.e. dwarf_info set), -1 on failure
371 int so_info_set_dwarf_info_debug_link(struct so_info
*so
)
374 const char *dbg_dir
= NULL
;
375 char *dir_name
= NULL
, *so_dir
= NULL
, *path
= NULL
;
376 size_t max_path_len
= 0;
378 if (!so
|| !so
->dbg_link_filename
) {
382 dbg_dir
= opt_debug_info_dir
? : DEFAULT_DEBUG_DIR
;
384 dir_name
= dirname(so
->elf_path
);
389 /* so_dir is just dir_name with a trailing slash */
390 so_dir
= malloc(strlen(dir_name
) + 2);
395 strcpy(so_dir
, dir_name
);
398 max_path_len
= strlen(dbg_dir
) + strlen(so_dir
) +
399 strlen(DEBUG_SUBDIR
) + strlen(so
->dbg_link_filename
)
401 path
= malloc(max_path_len
);
406 /* First look in the SO's dir */
407 strcpy(path
, so_dir
);
408 strcat(path
, so
->dbg_link_filename
);
410 if (is_valid_debug_file(path
, so
->dbg_link_crc
)) {
414 /* If not found, look in .debug subdir */
415 strcpy(path
, so_dir
);
416 strcat(path
, DEBUG_SUBDIR
);
417 strcat(path
, so
->dbg_link_filename
);
419 if (is_valid_debug_file(path
, so
->dbg_link_crc
)) {
423 /* Lastly, look under the global debug directory */
424 strcpy(path
, dbg_dir
);
425 strcat(path
, so_dir
);
426 strcat(path
, so
->dbg_link_filename
);
428 if (is_valid_debug_file(path
, so
->dbg_link_crc
)) {
441 ret
= so_info_set_dwarf_info_from_path(so
, path
);
450 * Initialize the DWARF info for a given executable.
452 * @param so so_info instance
453 * @returns 0 on success, -1 on failure
456 int so_info_set_dwarf_info(struct so_info
*so
)
464 /* First try to set the DWARF info from the ELF file */
465 ret
= so_info_set_dwarf_info_from_path(so
, so
->elf_path
);
471 * If that fails, try to find separate debug info via build ID
474 ret
= so_info_set_dwarf_info_build_id(so
);
479 ret
= so_info_set_dwarf_info_debug_link(so
);
491 * Initialize the ELF file for a given executable.
493 * @param so so_info instance
494 * @returns 0 on success, -1 on failure
497 int so_info_set_elf_file(struct so_info
*so
)
500 Elf
*elf_file
= NULL
;
506 elf_fd
= open(so
->elf_path
, O_RDONLY
);
508 fprintf(stderr
, "Failed to open %s\n", so
->elf_path
);
512 elf_file
= elf_begin(elf_fd
, ELF_C_READ
, NULL
);
514 fprintf(stderr
, "elf_begin failed: %s\n", elf_errmsg(-1));
518 if (elf_kind(elf_file
) != ELF_K_ELF
) {
519 fprintf(stderr
, "Error: %s is not an ELF object\n",
525 so
->elf_file
= elf_file
;
536 void source_location_destroy(struct source_location
*src_loc
)
542 free(src_loc
->filename
);
546 * Append a string representation of an address offset to an existing
549 * On success, the out parameter `result` will contain the base string
550 * followed by the offset string of the form "+0x1234". On failure,
551 * `result` remains unchanged.
553 * @param base_str The string to which to append an offset string
554 * @param low_addr The lower virtual memory address, the base from
555 * which the offset is computed
556 * @param high_addr The higher virtual memory address
557 * @param result Out parameter, the base string followed by the
559 * @returns 0 on success, -1 on failure
562 int so_info_append_offset_str(const char *base_str
, uint64_t low_addr
,
563 uint64_t high_addr
, char **result
)
567 char *_result
= NULL
;
568 char offset_str
[ADDR_STR_LEN
];
570 if (!base_str
|| !result
) {
574 offset
= high_addr
- low_addr
;
576 _result
= malloc(strlen(base_str
) + ADDR_STR_LEN
);
581 ret
= snprintf(offset_str
, ADDR_STR_LEN
, "+%#0" PRIx64
, offset
);
585 strcpy(_result
, base_str
);
586 strcat(_result
, offset_str
);
597 * Try to find the symbol closest to an address within a given ELF
600 * Only function symbols are taken into account. The symbol's address
601 * must precede `addr`. A symbol with a closer address might exist
602 * after `addr` but is irrelevant because it cannot encompass `addr`.
604 * On success, if found, the out parameters `sym` and `shdr` are
605 * set. On failure or if none are found, they remain unchanged.
607 * @param scn ELF section in which to look for the address
608 * @param addr Virtual memory address for which to find the
609 * nearest function symbol
610 * @param sym Out parameter, the nearest function symbol
611 * @param shdr Out parameter, the section header for scn
612 * @returns 0 on success, -1 on failure
615 int so_info_get_nearest_symbol_from_section(Elf_Scn
*scn
, uint64_t addr
,
616 GElf_Sym
**sym
, GElf_Shdr
**shdr
)
620 Elf_Data
*data
= NULL
;
621 GElf_Shdr
*_shdr
= NULL
;
622 GElf_Sym
*nearest_sym
= NULL
;
624 if (!scn
|| !sym
|| !shdr
) {
628 _shdr
= g_new0(GElf_Shdr
, 1);
633 _shdr
= gelf_getshdr(scn
, _shdr
);
638 if (_shdr
->sh_type
!= SHT_SYMTAB
) {
640 * We are only interested in symbol table (symtab)
641 * sections, skip this one.
646 data
= elf_getdata(scn
, NULL
);
651 symbol_count
= _shdr
->sh_size
/ _shdr
->sh_entsize
;
653 for (i
= 0; i
< symbol_count
; ++i
) {
654 GElf_Sym
*cur_sym
= NULL
;
656 cur_sym
= g_new0(GElf_Sym
, 1);
660 cur_sym
= gelf_getsym(data
, i
, cur_sym
);
664 if (GELF_ST_TYPE(cur_sym
->st_info
) != STT_FUNC
) {
665 /* We're only interested in the functions. */
670 if (cur_sym
->st_value
<= addr
&&
672 cur_sym
->st_value
> nearest_sym
->st_value
)) {
674 nearest_sym
= cur_sym
;
697 * Get the name of the function containing a given address within an
698 * executable using ELF symbols.
700 * The function name is in fact the name of the nearest ELF symbol,
701 * followed by the offset in bytes between the address and the symbol
702 * (in hex), separated by a '+' character.
704 * If found, the out parameter `func_name` is set on success. On failure,
705 * it remains unchanged.
707 * @param so so_info instance for the executable containing
709 * @param addr Virtual memory address for which to find the
711 * @param func_name Out parameter, the function name
712 * @returns 0 on success, -1 on failure
715 int so_info_lookup_elf_function_name(struct so_info
*so
, uint64_t addr
,
719 * TODO (possible optimisation): if an ELF has no symtab
720 * section, it has been stripped. Therefore, it would be wise
721 * to store a flag indicating the stripped status after the
722 * first iteration to prevent subsequent ones.
726 GElf_Sym
*sym
= NULL
;
727 GElf_Shdr
*shdr
= NULL
;
728 char *sym_name
= NULL
;
730 /* Set ELF file if it hasn't been accessed yet. */
732 ret
= so_info_set_elf_file(so
);
734 /* Failed to set ELF file. */
739 scn
= elf_nextscn(so
->elf_file
, scn
);
744 while (scn
&& !sym
) {
745 ret
= so_info_get_nearest_symbol_from_section(
746 scn
, addr
, &sym
, &shdr
);
751 scn
= elf_nextscn(so
->elf_file
, scn
);
755 sym_name
= elf_strptr(so
->elf_file
, shdr
->sh_link
,
761 ret
= so_info_append_offset_str(sym_name
, sym
->st_value
, addr
,
779 * Get the name of the function containing a given address within a
780 * given compile unit (CU).
782 * If found, the out parameter `func_name` is set on success. On
783 * failure, it remains unchanged.
785 * @param cu bt_dwarf_cu instance which may contain the address
786 * @param addr Virtual memory address for which to find the
788 * @param func_name Out parameter, the function name
789 * @returns 0 on success, -1 on failure
792 int so_info_lookup_cu_function_name(struct bt_dwarf_cu
*cu
, uint64_t addr
,
795 int ret
= 0, found
= 0;
796 struct bt_dwarf_die
*die
= NULL
;
798 if (!cu
|| !func_name
) {
802 die
= bt_dwarf_die_create(cu
);
807 while (bt_dwarf_die_next(die
) == 0) {
810 ret
= bt_dwarf_die_get_tag(die
, &tag
);
815 if (tag
== DW_TAG_subprogram
) {
816 ret
= bt_dwarf_die_contains_addr(die
, addr
, &found
);
828 uint64_t low_addr
= 0;
829 char *die_name
= NULL
;
831 ret
= bt_dwarf_die_get_name(die
, &die_name
);
836 ret
= dwarf_lowpc(die
->dwarf_die
, &low_addr
);
841 ret
= so_info_append_offset_str(die_name
, low_addr
, addr
,
848 bt_dwarf_die_destroy(die
);
852 bt_dwarf_die_destroy(die
);
857 * Get the name of the function containing a given address within an
858 * executable using DWARF debug info.
860 * If found, the out parameter `func_name` is set on success. On
861 * failure, it remains unchanged.
863 * @param so so_info instance for the executable containing
865 * @param addr Virtual memory address for which to find the
867 * @param func_name Out parameter, the function name
868 * @returns 0 on success, -1 on failure
871 int so_info_lookup_dwarf_function_name(struct so_info
*so
, uint64_t addr
,
875 char *_func_name
= NULL
;
876 struct bt_dwarf_cu
*cu
= NULL
;
878 if (!so
|| !func_name
) {
882 cu
= bt_dwarf_cu_create(so
->dwarf_info
);
887 while (bt_dwarf_cu_next(cu
) == 0) {
888 ret
= so_info_lookup_cu_function_name(cu
, addr
, &_func_name
);
899 *func_name
= _func_name
;
902 bt_dwarf_cu_destroy(cu
);
906 bt_dwarf_cu_destroy(cu
);
911 int so_info_lookup_function_name(struct so_info
*so
, uint64_t addr
,
915 char *_func_name
= NULL
;
917 if (!so
|| !func_name
) {
921 /* Set DWARF info if it hasn't been accessed yet. */
922 if (!so
->dwarf_info
&& !so
->is_elf_only
) {
923 ret
= so_info_set_dwarf_info(so
);
925 /* Failed to set DWARF info, fallback to ELF. */
926 so
->is_elf_only
= true;
930 if (!so_info_has_address(so
, addr
)) {
935 * Addresses in ELF and DWARF are relative to base address for
936 * PIC, so make the address argument relative too if needed.
939 addr
-= so
->low_addr
;
942 if (so
->is_elf_only
) {
943 ret
= so_info_lookup_elf_function_name(so
, addr
, &_func_name
);
945 ret
= so_info_lookup_dwarf_function_name(so
, addr
, &_func_name
);
948 if (ret
|| !_func_name
) {
952 *func_name
= _func_name
;
960 int so_info_get_bin_loc(struct so_info
*so
, uint64_t addr
, char **bin_loc
)
963 char *_bin_loc
= NULL
;
965 if (!so
|| !bin_loc
) {
970 addr
-= so
->low_addr
;
971 ret
= asprintf(&_bin_loc
, "+%#0" PRIx64
, addr
);
973 ret
= asprintf(&_bin_loc
, "@%#0" PRIx64
, addr
);
976 if (ret
== -1 || !_bin_loc
) {
988 * Predicate used to determine whether the children of a given DIE
989 * contain a specific address.
991 * More specifically, the parameter `die` is expected to be a
992 * subprogram (function) DIE, and this predicate tells whether any
993 * subroutines are inlined within this function and would contain
996 * Do note that this function advances the position of `die`. If the
997 * address is found within one of its children, `die` will be pointing
998 * to that child upon returning from the function, allowing to extract
999 * the information deemed necessary.
1001 * @param die The parent DIE in whose children the address will be
1003 * @param addr The address for which to look for in the DIEs
1004 * @returns Returns 1 if the address was found, 0 if not
1007 int so_info_child_die_has_address(struct bt_dwarf_die
*die
, uint64_t addr
)
1009 int ret
= 0, contains
= 0;
1015 ret
= bt_dwarf_die_child(die
);
1023 ret
= bt_dwarf_die_get_tag(die
, &tag
);
1028 if (tag
== DW_TAG_inlined_subroutine
) {
1029 ret
= bt_dwarf_die_contains_addr(die
, addr
, &contains
);
1039 } while (bt_dwarf_die_next(die
) == 0);
1050 * Lookup the source location for a given address within a CU, making
1051 * the assumption that it is contained within an inline routine in a
1054 * @param cu bt_dwarf_cu instance in which to look for the address
1055 * @param addr The address for which to look for
1056 * @param src_loc Out parameter, the source location (filename and
1057 * line number) for the address
1058 * @returns 0 on success, -1 on failure
1061 int so_info_lookup_cu_src_loc_inl(struct bt_dwarf_cu
*cu
, uint64_t addr
,
1062 struct source_location
**src_loc
)
1064 int ret
= 0, found
= 0;
1065 struct bt_dwarf_die
*die
= NULL
;
1066 struct source_location
*_src_loc
= NULL
;
1068 if (!cu
|| !src_loc
) {
1072 die
= bt_dwarf_die_create(cu
);
1077 while (bt_dwarf_die_next(die
) == 0) {
1080 ret
= bt_dwarf_die_get_tag(die
, &tag
);
1085 if (tag
== DW_TAG_subprogram
) {
1088 ret
= bt_dwarf_die_contains_addr(die
, addr
, &contains
);
1095 * Try to find an inlined subroutine
1096 * child of this DIE containing addr.
1098 found
= so_info_child_die_has_address(
1107 char *filename
= NULL
;
1110 _src_loc
= g_new0(struct source_location
, 1);
1115 ret
= bt_dwarf_die_get_call_file(die
, &filename
);
1119 ret
= bt_dwarf_die_get_call_line(die
, &line_no
);
1125 _src_loc
->filename
= filename
;
1126 _src_loc
->line_no
= line_no
;
1127 *src_loc
= _src_loc
;
1130 bt_dwarf_die_destroy(die
);
1134 source_location_destroy(_src_loc
);
1135 bt_dwarf_die_destroy(die
);
1140 * Lookup the source location for a given address within a CU,
1141 * assuming that it is contained within an inlined function.
1143 * A source location can be found regardless of inlining status for
1144 * this method, but in the case of an inlined function, the returned
1145 * source location will point not to the callsite but rather to the
1146 * definition site of the inline function.
1148 * @param cu bt_dwarf_cu instance in which to look for the address
1149 * @param addr The address for which to look for
1150 * @param src_loc Out parameter, the source location (filename and
1151 * line number) for the address
1152 * @returns 0 on success, -1 on failure
1155 int so_info_lookup_cu_src_loc_no_inl(struct bt_dwarf_cu
*cu
, uint64_t addr
,
1156 struct source_location
**src_loc
)
1158 struct source_location
*_src_loc
= NULL
;
1159 struct bt_dwarf_die
*die
= NULL
;
1160 const char *filename
= NULL
;
1161 Dwarf_Line
*line
= NULL
;
1162 Dwarf_Addr line_addr
;
1165 if (!cu
|| !src_loc
) {
1169 die
= bt_dwarf_die_create(cu
);
1174 line
= dwarf_getsrc_die(die
->dwarf_die
, addr
);
1179 ret
= dwarf_lineaddr(line
, &line_addr
);
1184 filename
= dwarf_linesrc(line
, NULL
, NULL
);
1189 if (addr
== line_addr
) {
1190 _src_loc
= g_new0(struct source_location
, 1);
1195 ret
= dwarf_lineno(line
, &line_no
);
1200 _src_loc
->line_no
= line_no
;
1201 _src_loc
->filename
= strdup(filename
);
1204 bt_dwarf_die_destroy(die
);
1207 *src_loc
= _src_loc
;
1213 source_location_destroy(_src_loc
);
1214 bt_dwarf_die_destroy(die
);
1219 * Get the source location (file name and line number) for a given
1220 * address within a compile unit (CU).
1222 * On success, the out parameter `src_loc` is set if found. On
1223 * failure, it remains unchanged.
1225 * @param so bt_dwarf_cu instance for the compile unit which
1226 * may contain the address
1227 * @param addr Virtual memory address for which to find the
1229 * @param src_loc Out parameter, the source location
1230 * @returns 0 on success, -1 on failure
1233 int so_info_lookup_cu_src_loc(struct bt_dwarf_cu
*cu
, uint64_t addr
,
1234 struct source_location
**src_loc
)
1237 struct source_location
*_src_loc
= NULL
;
1239 if (!cu
|| !src_loc
) {
1243 ret
= so_info_lookup_cu_src_loc_inl(cu
, addr
, &_src_loc
);
1252 ret
= so_info_lookup_cu_src_loc_no_inl(cu
, addr
, &_src_loc
);
1263 *src_loc
= _src_loc
;
1269 source_location_destroy(_src_loc
);
1274 int so_info_lookup_source_location(struct so_info
*so
, uint64_t addr
,
1275 struct source_location
**src_loc
)
1277 struct bt_dwarf_cu
*cu
= NULL
;
1278 struct source_location
*_src_loc
= NULL
;
1280 if (!so
|| !src_loc
) {
1284 /* Set DWARF info if it hasn't been accessed yet. */
1285 if (!so
->dwarf_info
&& !so
->is_elf_only
) {
1286 if (so_info_set_dwarf_info(so
)) {
1287 /* Failed to set DWARF info. */
1288 so
->is_elf_only
= true;
1292 if (so
->is_elf_only
) {
1293 /* We cannot lookup source location without DWARF info. */
1297 if (!so_info_has_address(so
, addr
)) {
1302 * Addresses in ELF and DWARF are relative to base address for
1303 * PIC, so make the address argument relative too if needed.
1306 addr
-= so
->low_addr
;
1309 cu
= bt_dwarf_cu_create(so
->dwarf_info
);
1314 while (bt_dwarf_cu_next(cu
) == 0) {
1317 ret
= so_info_lookup_cu_src_loc(cu
, addr
, &_src_loc
);
1327 bt_dwarf_cu_destroy(cu
);
1329 *src_loc
= _src_loc
;
1335 source_location_destroy(_src_loc
);
1336 bt_dwarf_cu_destroy(cu
);