[Bug ipa/67600] [5/6 Regression] Segfault when assigning only one char to ostreambuf_iterator<char> compiled with -O2 or -O3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67600

--- Comment #5 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
OK,
the problem is that we loss offset of 64.  This happens in get_dynamic_type
where we restrict to inner class and get difference in between offset inside
restricted type and offset from basic instance pointer.

I am testing the following:
Index: ipa-polymorphic-call.c
===================================================================
--- ipa-polymorphic-call.c      (revision 228735)
+++ ipa-polymorphic-call.c      (working copy)
@@ -1621,13 +1637,13 @@ ipa_polymorphic_call_context::get_dynami
       print_generic_expr (dump_file, otr_object, TDF_SLIM);
       fprintf (dump_file, "  Outer instance pointer: ");
       print_generic_expr (dump_file, instance, TDF_SLIM);
-      fprintf (dump_file, " offset: %i (bits)", (int)offset);
+      fprintf (dump_file, " offset: %i (bits)", (int)instance_offset);
       fprintf (dump_file, " vtbl reference: ");
       print_generic_expr (dump_file, instance_ref, TDF_SLIM);
       fprintf (dump_file, "\n");
     }

-  tci.offset = offset;
+  tci.offset = instance_offset;
   tci.instance = instance;
   tci.vtbl_ptr_ref = instance_ref;
   gcc_assert (TREE_CODE (instance) != MEM_REF);


will need to re-read the code to double check it works as intended now, but I
would think so ;)

Honza