[patch] dwarf2out crash: missing GTY? (PR 50806)

[Alexandre Oliva]

On Oct 21, 2011, Steve Ellcey <sje@cup.hp.com> wrote:

> On Fri, 2011-10-21 at 21:25 +0200, Jakub Jelinek wrote:
>> My guess would be
>> http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180194
>> DEBUG_EXPR certainly shouldn't make it through into mem_loc_descriptor,
>> var-tracking is supposed to resolve that.
>> 
>> Jakub

> You are right, the bug started at r180194.  I have submitted a bug (PR
> 50826) which includes a cut down test case for the problem.

Thanks for testing this patch on the affected platform.  I also
bootstrapped it on {x86_64,i686}-linux-gnu, with and without an
additional patch that looked for debug_exprs in any loc expr associated
with multi-part variables.  That didn't get any hits, so I ended up
finding out it is the use of a pseudo to hold the internal_arg_pointer
that leads to a chain of events that results in a debug temp bound to a
hard reg ending up used in MEM addresses of incoming args referenced in
the exprs of other debug temps.  (more details in the bug report)

Ok to install?

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-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
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