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re PR c++/9433 (SegFault in dynamic_cast)

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libstdc++-v3:
        PR c++/9433
        * libsupc++/tinfo.cc (__vmi_class_type_info::__do_dyncast): Cope
        with bases which are very ambiguous.
gcc/testsuite:
        * g++.dg/abi/dcast1.C: New test.

From-SVN: r61973
This commit is contained in:
Nathan Sidwell 2003-01-28 15:26:53 +00:00 committed by Nathan Sidwell
parent a77b7e32ec
commit 483a570922
4 changed files with 43 additions and 3 deletions
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4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2003-01-28 Nathan Sidwell <nathan@codesourcery.com>
* g++.dg/abi/dcast1.C: New test.
2003-01-28 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* gcc.c-torture/execute/builtin-constant.x: Only expect failure at -O1.

29
gcc/testsuite/g++.dg/abi/dcast1.C Normal file
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@ -0,0 +1,29 @@
// { dg-do compile }
// Copyright (C) 2003 Free Software Foundation, Inc.
// Contributed by Nathan Sidwell 28 Jan 2003 <nathan@codesourcery.com>
// PR 9433. segfault at runtime.
struct A { virtual void f() {}; };
struct B {int b;};
struct C : A, B { virtual void f() {}; int c;};
struct D : C {int d;};
struct E : C {int e;};
struct F : protected D, E {int f;};
struct H : virtual F {int h;};
struct I : H {int i;};
struct J : H {int j;};
struct K : I, J { virtual void f() {}; int k; };
struct M : K {int m;};
struct N : M {int n;};
struct O : M {int o;};
struct P : N, O { virtual void f() {}; int p;};
int main()
{
P obj;
A* a1 = (D *) (&obj);
H* hp = dynamic_cast<H*>(a1);
return hp != 0;
}

6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2003-01-28 Nathan Sidwell <nathan@codesourcery.com>
PR c++/9433
* libsupc++/tinfo.cc (__vmi_class_type_info::__do_dyncast): Cope
with bases which are very ambiguous.
2003-01-28 Danny Smith <dannysmith@users.sourceforge.net>
* src/Makefile.am (CONFIG_CXXFLAGS): Reverse order of

7
libstdc++-v3/libsupc++/tinfo.cc
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@ -1,5 +1,5 @@
// Methods for type_info for -*- C++ -*- Run Time Type Identification.
// Copyright (C) 1994, 1996, 1998, 1999, 2000, 2001, 2002
// Copyright (C) 1994, 1996, 1998, 1999, 2000, 2001, 2002, 2003
// Free Software Foundation
//
// This file is part of GNU CC.
@ -482,8 +482,9 @@ __do_dyncast (ptrdiff_t src2dst,
result.whole2dst =
__sub_kind (result.whole2dst | result2.whole2dst);
}
else if ((result.dst_ptr != 0 | result_ambig)
&& (result2.dst_ptr != 0 | result2_ambig))
else if ((result.dst_ptr != 0 & result2.dst_ptr != 0)
|| (result.dst_ptr != 0 & result2_ambig)
|| (result2.dst_ptr != 0 & result_ambig))
{
// Found two different DST_TYPE bases, or a valid one and a set of
// ambiguous ones, must disambiguate. See whether SRC_PTR is