On Thu, Dec 1, 2016 at 1:25 PM, Jeff Law <l...@redhat.com> wrote:
> On 12/01/2016 09:15 AM, David Edelsohn wrote:
>>
>> A number of the "variant" testcases fail to build on AIX and targets
>> that use stabs. The failure looks like:
>>
>> /tmp/GCC/powerpc-ibm-aix7.2.0.0/libstdc++-v3/include/variant:956:
>> internal compiler error: tree check: expected field_decl, have
>> template_decl in int_bit_position, at tree.h:5396
>>
>> which occurs in dbxout_type_fields()
>>
>> /* Output the name, type, position (in bits), size (in bits) of each
>> field that we can support. */
>> for (tem = TYPE_FIELDS (type); tem; tem = DECL_CHAIN (tem))
>> ...
>> if (VAR_P (tem))
>> {
>> ...
>> }
>> else
>> {
>> stabstr_C (',');
>> stabstr_D (int_bit_position (tem));
>> stabstr_C (',');
>> stabstr_D (tree_to_uhwi (DECL_SIZE (tem)));
>> stabstr_C (';');
>> }
>>
>> where tem is a TEMPLATE_DECL. The dbxout code currently skips
>> TYPE_DECL, nameless fields, and CONST_DECL.
>>
>> dbxout_type_methods() explicitly skips TEMPLATE_DECLs with the comment
>> "The debugger doesn't know what to do with such entities anyhow", so
>> this proposed patch skips them in dbxout_type_fields() as well.
>>
>> Okay?
>>
>> Thanks, David
>>
>>
>> PR debug/66419
>> PR c++/78235
>> * dbxout.c (dbxout_type_fields): Skip TEMPLATE_DECLs.
>
> From the looks of things, it appears we skip them in the dwarf2 code as
> well. But I don't think we can use TEMPLATE_DECL here as that's defined by
> the C++ front end.
TEMPLATE_DECL is defined in cp/cp-tree.def, which is included in
all-tree.def, which is included in tree-core.h, which is included in
tree.h, which is included in dbxout.c.
It also is referenced in common code in gcc/tree.c.
> I think instead if you test something like:
> (int)TREE_CODE (decl) > NUM_TREE_CODES
>
> You'll filter out any _DECL nodes coming out of the front-ends.
No other DECLs seem to escape.
- David
