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| author | Tom de Vries <tdevries@suse.de> | 2019-01-17 13:42:20 +0000 |
|---|---|---|
| committer | Tom de Vries <vries@gcc.gnu.org> | 2019-01-17 13:42:20 +0000 |
| commit | 1c2a9a37c681aa24ece35b671931870b1afe5797 (patch) | |
| tree | 4b2be38998bc9b1b8ba93ff07ea35b71da40244b /libbacktrace/dwarf.c | |
| parent | 9d576782a29581c04c60d7b9415bb7d3014b0c8c (diff) | |
| download | gcc-1c2a9a37c681aa24ece35b671931870b1afe5797.tar.gz | |
[libbacktrace] Handle DW_FORM_GNU_ref_alt
Handle DW_FORM_GNU_ref_alt which references the .debug_info section in the
.gnu_debugaltlink file.
2019-01-17 Tom de Vries <tdevries@suse.de>
PR libbacktrace/82857
* dwarf.c (enum attr_val_encoding): Add ATTR_VAL_REF_ALT_INFO.
(read_attribute): Handle DW_FORM_GNU_ref_alt using
ATTR_VAL_REF_ALT_INFO.
(read_referenced_name_from_attr): Handle DW_FORM_GNU_ref_alt.
From-SVN: r268031
Diffstat (limited to 'libbacktrace/dwarf.c')
| -rw-r--r-- | libbacktrace/dwarf.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/libbacktrace/dwarf.c b/libbacktrace/dwarf.c index 6f56c46774b..aacbd3a453d 100644 --- a/libbacktrace/dwarf.c +++ b/libbacktrace/dwarf.c @@ -143,6 +143,8 @@ enum attr_val_encoding ATTR_VAL_REF_UNIT, /* An offset to other data within the .dwarf_info section. */ ATTR_VAL_REF_INFO, + /* An offset to other data within the alt .dwarf_info section. */ + ATTR_VAL_REF_ALT_INFO, /* An offset to data in some other section. */ ATTR_VAL_REF_SECTION, /* A type signature. */ @@ -858,7 +860,7 @@ read_attribute (enum dwarf_form form, struct dwarf_buf *buf, val->encoding = ATTR_VAL_NONE; return 1; } - val->encoding = ATTR_VAL_REF_SECTION; + val->encoding = ATTR_VAL_REF_ALT_INFO; return 1; case DW_FORM_GNU_strp_alt: { @@ -2200,6 +2202,19 @@ read_referenced_name_from_attr (struct dwarf_data *ddata, struct unit *u, || val->encoding == ATTR_VAL_REF_UNIT) return read_referenced_name (ddata, u, val->u.uint, error_callback, data); + if (val->encoding == ATTR_VAL_REF_ALT_INFO) + { + struct unit *alt_unit + = find_unit (ddata->altlink->units, ddata->altlink->units_count, + val->u.uint); + if (alt_unit == NULL) + return NULL; + + uint64_t offset = val->u.uint - alt_unit->low_offset; + return read_referenced_name (ddata->altlink, alt_unit, offset, + error_callback, data); + } + return NULL; } |