[Bug ipa/64139] [4.9/5 Regression] ice in possible_polymorphic_call_targets, at ipa-devirt.c:2410

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64139

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |trippels at gcc dot gnu.org
            Summary|[5 Regression] ice in       |[4.9/5 Regression] ice in
                   |possible_polymorphic_call_t |possible_polymorphic_call_t
                   |argets, at                  |argets, at
                   |ipa-devirt.c:2410           |ipa-devirt.c:2410
      Known to fail|                            |4.9.1, 5.0

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
reduced test case:

class IObject {
public:
  virtual ~IObject();
};
class A {
  virtual int m_fn1();
};
class B {
public:
  virtual int m_fn2(B) const;
};
class D : IObject, public virtual B {};
class G : public D, A {
public:
  G(A);
};
class F : B {
  friend class C;
};
class C {
  void m_fn3(const IObject &, int &);
  void m_fn4(const B &, int &);
};
A a;
void C::m_fn3(const IObject &, int &p2) {
  G r(a);
  m_fn4(r, p2);
}
void C::m_fn4(const B &p1, int &) {
  F b;
  p1.m_fn2(b);
}

Also ICEs with gcc-4.9:

trippels@gcc20 ~ % g++ -c -O2 bug178.cc
bug178.cc: In member function ‘void C::m_fn3(const IObject&, int&)’:
bug178.cc:32:1: internal compiler error: in possible_polymorphic_call_targets,
at ipa-devirt.c:1557
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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/64285] New: [5 Regression] During LTO: ICE segfault in ipa_polymorphic_call_context::get_dynamic_type
Date: Fri, 12 Dec 2014 11:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd285

            Bug ID: 64285
           Summary: [5 Regression] During LTO: ICE segfault in
                    ipa_polymorphic_call_context::get_dynamic_type
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org

I tried compiling the program again which gave the ICE of PR64043, motivated by
the patch https://gcc.gnu.org/ml/gcc-patches/2014-12/msg01076.html which looks
vaguely related.

In any case, it now (r218661) fails with:

gcc-trunk/include/c++/5.0.0/bits/unique_ptr.h:70:0: internal compiler error:
Segmentation fault
       operator()(_Tp* __ptr) const
 ^
0xa2576f crash_signal
        ../../gcc/toplev.c:358
0x878d2f tree_check(tree_node*, char const*, int, char const*, tree_code)
        ../../gcc/tree.h:2778
0x878d2f ipa_polymorphic_call_context::get_dynamic_type(tree_node*, tree_node*,
tree_node*, gimple_statement_base*)
        ../../gcc/ipa-polymorphic-call.c:1594
0xb9f23e eliminate_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc/tree-ssa-pre.c:4334
0xfde647 dom_walker::walk(basic_block_def*)
        ../../gcc/domwalk.c:188
0xba0da0 eliminate
        ../../gcc/tree-ssa-pre.c:4491
0xba0ff5 execute
        ../../gcc/tree-ssa-pre.c:4910


Testcase reduction under way