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[patch] dwarf display: false (location list) in DWARF-4
- From: Jan Kratochvil <jan dot kratochvil at redhat dot com>
- To: binutils at sourceware dot org
- Date: Wed, 27 Jul 2011 12:06:05 +0200
- Subject: [patch] dwarf display: false (location list) in DWARF-4
Hi,
echo 'struct s { char a[1<<24]; int b; } s;'|gcc -gdwarf-4 -o 1.o -c -x c -;readelf -wia 1.o
<2><34>: Abbrev Number: 4 (DW_TAG_member)
<35> DW_AT_name : b
<37> DW_AT_decl_file : 1
<38> DW_AT_decl_line : 1
<39> DW_AT_type : <0x55>
<3d> DW_AT_data_member_location: 0x1000000 (location list)
+
4 DW_TAG_member [no children]
DW_AT_name DW_FORM_string
DW_AT_decl_file DW_FORM_data1
DW_AT_decl_line DW_FORM_data1
DW_AT_type DW_FORM_ref4
DW_AT_data_member_location DW_FORM_data4
But that is wrong, DWARF-4 has DW_FORM_sec_offset for `(location list)',
0x1000000 is normal data (DW_FORM_data4) in DWARF-4. There should be just:
<3d> DW_AT_data_member_location: 0x1000000
No regressions on {x86_64,i686}-fedora16pre-linux-gnu. I haven't found the
string "location list" anywhere in the testsuites so I hope I did not break any
other targets' testsuites.
Thanks,
Jan
binutils/
2011-07-27 Jan Kratochvil <jan.kratochvil@redhat.com>
* dwarf.c (read_and_display_attr_value): Recognize DW_FORM_data4 and
DW_FORM_data8 as location list pointers only for DWARF < 4.
--- a/binutils/dwarf.c
+++ b/binutils/dwarf.c
@@ -1485,8 +1485,8 @@ read_and_display_attr_value (unsigned long attribute,
case DW_AT_GNU_call_site_data_value:
case DW_AT_GNU_call_site_target:
case DW_AT_GNU_call_site_target_clobbered:
- if (form == DW_FORM_data4
- || form == DW_FORM_data8
+ if ((dwarf_version < 4
+ && (form == DW_FORM_data4 || form == DW_FORM_data8))
|| form == DW_FORM_sec_offset)
{
/* Process location list. */
@@ -1516,8 +1516,8 @@ read_and_display_attr_value (unsigned long attribute,
break;
case DW_AT_ranges:
- if (form == DW_FORM_data4
- || form == DW_FORM_data8
+ if ((dwarf_version < 4
+ && (form == DW_FORM_data4 || form == DW_FORM_data8))
|| form == DW_FORM_sec_offset)
{
/* Process range list. */
@@ -1734,8 +1734,8 @@ read_and_display_attr_value (unsigned long attribute,
case DW_AT_GNU_call_site_data_value:
case DW_AT_GNU_call_site_target:
case DW_AT_GNU_call_site_target_clobbered:
- if (form == DW_FORM_data4
- || form == DW_FORM_data8
+ if ((dwarf_version < 4
+ && (form == DW_FORM_data4 || form == DW_FORM_data8))
|| form == DW_FORM_sec_offset)
printf (_("(location list)"));
/* Fall through. */