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

[Aldy Hernandez]

On 10/15/14 00:55, Richard Biener wrote:
> On Tue, Oct 14, 2014 at 10:07 PM, Aldy Hernandez <aldyh@redhat.com> wrote:
>> On 10/14/14 06:21, Richard Biener wrote:
>>>
>>> On Tue, Oct 14, 2014 at 2:48 AM, 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.
>
> Yes, we'd create the DW_TAG_lexical_block early, store and stream a
> reference to the early DIE in the BLOCK and annotate that DIE
> late by means of some clever dwarf tricks.

I didn't realize adding fields/bits to the tree structure was on the 
table.  This makes things simpler.

That being said, it seems like a lot of this will become clearer as I 
implement it.  Thanks so much for the guidance.  I'll now go off into a 
little dark corner and think about this some more while I crank out some 
incremental patches.

Thanks again.
Aldy