[Bug ipa/66896] ipa-prop.c:2479 runtime error: member call on null pointer of type 'struct ipa_polymorphic_call_context'

["jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66896

Martin Jambor <jamborm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jamborm at gcc dot gnu.org

--- Comment #7 from Martin Jambor <jamborm at gcc dot gnu.org> ---
(In reply to Vittorio Zecca from comment #6)
> I just found the same issue at line 2479:

As even the the gcc-5 branch is changing slightly, line numbers on
their own are not are not the best indicator of the position of the
code you refer to.

> dst_ctx->combine_with (ctx);
> dst_ctx is again NULL
> Maybe the same patch should be applied here? Namely:
> if (!dst_ctx)
>                         {
>                           vec_safe_grow_cleared
> (args->polymorphic_call_contexts,
>                                                  count);
>                           dst_ctx =
> ipa_get_ith_polymorhic_call_context (args, i);
>                         }
> immediately before?

I have looked at both occurrences of dst_ctx->combine_with (ctx) in
function update_jump_functions_after_inlining and they are all
guarded with the code just as you describe.

> Do you need a reproducer?

Yes please, I cannot see the error you describe.  Thanks.