[debug-early] LTO streaming of on-the-side dwarf data structures

[Richard Biener]

On Tue, Oct 14, 2014 at 10:32 PM, Aldy Hernandez <aldyh@redhat.com> wrote:
>
>> Another similar issue I've seen is handling DW_TAG_lexical_block
>> (gen_lexical_block_die).  Ideally we should generate the
>> DW_TAG_lexical_block and the corresponding locals in early dumping, and
>> then fill in the high/low attributes of the lexical block the second
>> time around.  We would need a hash similar to decl_die_table to get from
>> BLOCK->DW_TAG_lexical_block, similar to die_table_offset.  For that
>> matter, we could store the relationship in die_table_offset, or in the
>> die_offset if I understood things correctly.
>
>
> Errr, we can't store a TREE->DW_TAG_lexical_block relationship in
> die_table_offset cause we don't have a DECL_UID.  So we need another
> mechanism.

Either put a pointer into TREE_BLOCK or use a combination of
BLOCK_NUMBER (hopefully that's stable - aww, it doesn't look like so)
and its function context decl UID.  A pointer-map also works, of course.

Richard.

> Aldy