[RFC,symtab] Warn about unresolved DW_AT_upper_bound/DW_AT_count
Commit Message
Hi,
this patch (without test-case for now) generates a warning if
DW_AT_upper_bound or DW_AT_count is defined, but can't be translated. This
is triggered for current gcc in lto mode for vla test-cases.
F.i.:
...
$ gcc gcc/testsuite/gcc.dg/guality/vla-1.c -g -O2 -flto \
-DPREVENT_OPTIMIZATION -o ./vla-1.exe
$ ./gdb -batch -ex "set complaints 10" -ex "file ./vla-1.exe"
During symbol reading, Unresolved DW_AT_upper_bound - DIE at 0x337
[in module vla-1.exe].
...
Good idea?
Any other comments?
Thanks,
- Tom
[gdb/symtab] Warn about unresolved DW_AT_upper_bound/DW_AT_count
2018-07-18 Tom de Vries <tdevries@suse.de>
* dwarf2read.c (read_subrange_type): Warn if DW_AT_upper_bound or
DW_AT_count can't be translated to a dynamic prop.
---
gdb/dwarf2read.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
Comments
>>>>> "Tom" == Tom de Vries <tdevries@suse.de> writes:
Tom> this patch (without test-case for now) generates a warning if
Tom> DW_AT_upper_bound or DW_AT_count is defined, but can't be translated. This
Tom> is triggered for current gcc in lto mode for vla test-cases.
Tom> F.i.:
Tom> ...
Tom> $ gcc gcc/testsuite/gcc.dg/guality/vla-1.c -g -O2 -flto \
Tom> -DPREVENT_OPTIMIZATION -o ./vla-1.exe
Tom> $ ./gdb -batch -ex "set complaints 10" -ex "file ./vla-1.exe"
Tom> During symbol reading, Unresolved DW_AT_upper_bound - DIE at 0x337
Tom> [in module vla-1.exe].
Tom> ...
Tom> Good idea?
I think so.
Tom> + if (attr_ub)
[...]
Tom> + if (attr_count)
The gdb style is to use a check against nullptr in these spots.
Tom
@@ -17596,10 +17596,11 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
sect_offset_str (die->sect_off),
objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
- attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
+ struct attribute *attr_ub, *attr_count;
+ attr = attr_ub = dwarf2_attr (die, DW_AT_upper_bound, cu);
if (!attr_to_dynamic_prop (attr, die, cu, &high))
{
- attr = dwarf2_attr (die, DW_AT_count, cu);
+ attr = attr_count = dwarf2_attr (die, DW_AT_count, cu);
if (attr_to_dynamic_prop (attr, die, cu, &high))
{
/* If bounds are constant do the final calculation here. */
@@ -17608,6 +17609,20 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
else
high_bound_is_count = 1;
}
+ else
+ {
+ if (attr_ub)
+ complaint (_("Unresolved DW_AT_upper_bound "
+ "- DIE at %s [in module %s]"),
+ sect_offset_str (die->sect_off),
+ objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
+ if (attr_count)
+ complaint (_("Unresolved DW_AT_count "
+ "- DIE at %s [in module %s]"),
+ sect_offset_str (die->sect_off),
+ objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
+ }
+
}
/* Dwarf-2 specifications explicitly allows to create subrange types