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[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
This commit is contained in:
Tom de Vries 2019-01-17 13:42:20 +00:00 committed by Tom de Vries
parent 9d576782a2
commit 1c2a9a37c6
2 changed files with 24 additions and 1 deletions
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8
libbacktrace/ChangeLog
View File

@ -1,3 +1,11 @@
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.
2019-01-17 Tom de Vries <tdevries@suse.de>
* dwarf.c (struct unit): Add low_offset and high_offset fields.

17
libbacktrace/dwarf.c
View File

@ -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;
}