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Fix DW_AT_lower_bound defaults for DWARF-4+.
	* dwarf2read.c (read_subrange_type): Remove initialization of low and
	high.  New variable low_default_is_valid.  Implement DWARF-4+
	DW_AT_lower_bound defaults.  Print complaint for DW_AT_lower_bound with
	no default by the DWARF standard.
This commit is contained in:
Jan Kratochvil 2012-04-26 20:32:30 +00:00
parent 14132e8924
commit 4fae6e18a2
2 changed files with 42 additions and 5 deletions
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8
gdb/ChangeLog
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@ -1,3 +1,11 @@
2012-04-26 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix DW_AT_lower_bound defaults for DWARF-4+.
* dwarf2read.c (read_subrange_type): Remove initialization of low and
high. New variable low_default_is_valid. Implement DWARF-4+
DW_AT_lower_bound defaults. Print complaint for DW_AT_lower_bound with
no default by the DWARF standard.
2012-04-26 Maciej W. Rozycki <macro@mips.com>
Maciej W. Rozycki <macro@codesourcery.com>

39
gdb/dwarf2read.c
View File

@ -9086,8 +9086,8 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
struct type *base_type;
struct type *range_type;
struct attribute *attr;
LONGEST low = 0;
LONGEST high = -1;
LONGEST low, high;
int low_default_is_valid;
char *name;
LONGEST negative_mask;
@ -9100,10 +9100,35 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
if (range_type)
return range_type;
if (cu->language == language_fortran)
/* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
omitting DW_AT_lower_bound. */
switch (cu->language)
{
/* FORTRAN implies a lower bound of 1, if not given. */
case language_c:
case language_cplus:
low = 0;
low_default_is_valid = 1;
break;
case language_fortran:
low = 1;
low_default_is_valid = 1;
break;
case language_d:
case language_java:
case language_objc:
low = 0;
low_default_is_valid = (cu->header.version >= 4);
break;
case language_ada:
case language_m2:
case language_pascal:
low = 1;
low_default_is_valid = (cu->header.version >= 4);
break;
default:
low = 0;
low_default_is_valid = 0;
break;
}
/* FIXME: For variable sized arrays either of these could be
@ -9111,7 +9136,11 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
but we don't know how to handle it. */
attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
if (attr)
low = dwarf2_get_attr_constant_value (attr, 0);
low = dwarf2_get_attr_constant_value (attr, low);
else if (!low_default_is_valid)
complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
"- DIE at 0x%x [in module %s]"),
die->offset.sect_off, cu->objfile->name);
attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
if (attr)