[PATCH] Fix profiledbootstrap ada checking failure (PR debug/79255)

Jakub Jelinek jakub@redhat.com
Fri Mar 24 08:14:00 GMT 2017

On Thu, Mar 23, 2017 at 05:24:31PM -0400, Jason Merrill wrote:
> On Thu, Mar 23, 2017 at 4:44 PM, Jakub Jelinek <jakub@redhat.com> wrote:
> > The following C testcase shows how profiledbootstrap fails with checking
> > compiler.  We have a (nested) FUNCTION_DECL inside of BLOCK_VARS of an
> > inline function, when it gets inlined, it is moved into
> > BLOCK_NONLOCALIZED_VARS.  And, decls_for_scope calls process_scope_var
> > with NULL decl and non-NULL origin for all BLOCK_NONLOCALIZED_VARS.
> > That is fine for variables, but for FUNCTION_DECLs it can actually
> > try to dwarf2out_abstract_function that FUNCTION_DECL, which should be
> > really done only when it is inlined (i.e. BLOCK_ABSTRACT_ORIGIN of
> > some BLOCK).
> And when it's cloned.
> But does it make sense for gen_decl_die to call
> dwarf2out_abstract_function when decl is null?  That seems wrong.

Before r144529 we had just:
  if (DECL_ORIGIN (decl) != decl)
    dwarf2out_abstract_function (DECL_ABSTRACT_ORIGIN (decl));
and that is indeed to handle clones etc.

r144529 changed that to:
  if (origin || DECL_ORIGIN (decl) != decl)
    dwarf2out_abstract_function (DECL_ABSTRACT_ORIGIN (decl));
All of the decl is NULL introduced in r144529 implies decl_or_origin
is abstract.

Removing that origin || wouldn't really work, we'd have to rewrite most of
gen_decl_die FUNCTION_DECL handling to use decl_or_origin instead of
decl etc.

But it doesn't look right to me, conceptually a FUNCTION_DECL in
BLOCK_NONLOCALIZED_VARS is nothing that represents a clone or something
abstract in itself.  We can't keep it in BLOCK_VARS just because those
are chained through DECL_CHAIN and a single FUNCTION_DECL can't be
put into multiple BLOCK_VARS chains.  It is still the same FUNCTION_DECL,
not a sign that we want to have in each inline function a separate
function declaration with abstract origin of the original FUNCTION_DECL.


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