[Bug tree-optimization/45580] [4.6 Regression] Building WebKit fails with compiler catching SIGSEGV in gimple_fold_obj_type_ref_known_binfo()

[jamborm at gcc dot gnu dot org]

------- Comment #4 from jamborm at gcc dot gnu dot org  2010-09-17 18:21 -------
The problem is a big one.  In short, placement new operator changes
the type of an object to another, which re-sets up the VMT. Then there
is call of a virtual method of the latter type.  CCP however happily
propagates the initial declaration (of a type with no virtual methods)
to the OBJ_TYPE_REF and attempts to fold it.  The folding function
naturally expect to see some virtual methods in BINFOs but there are
none and we dereference a NULL pointer.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45580