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re PR c++/67576 (expression of typeid( expression ) is evaluated twice)

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PR c++/67576

	PR c++/25466
	* rtti.c (build_typeid): Use save_expr, not stabilize_reference.

From-SVN: r231776
This commit is contained in:
Jason Merrill 2015-12-17 11:51:52 -05:00 • committed by Jason Merrill
parent 1ad2439bea
commit 6ef15591e3
3 changed files with 23 additions and 1 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2015-12-17 Jason Merrill <jason@redhat.com>
PR c++/67576
PR c++/25466
* rtti.c (build_typeid): Use save_expr, not stabilize_reference.
2015-12-16 Patrick Palka <ppalka@gcc.gnu.org>
PR c++/16333

2
gcc/cp/rtti.c
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@ -332,7 +332,7 @@ build_typeid (tree exp, tsubst_flags_t complain)
/* So we need to look into the vtable of the type of exp.
Make sure it isn't a null lvalue. */
exp = cp_build_addr_expr (exp, complain);
exp = stabilize_reference (exp);
exp = save_expr (exp);
cond = cp_convert (boolean_type_node, exp, complain);
exp = cp_build_indirect_ref (exp, RO_NULL, complain);
}

16
gcc/testsuite/g++.dg/rtti/typeid11.C Normal file
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@ -0,0 +1,16 @@
// { dg-do run }
#include <typeinfo>
struct Base { virtual void foo() {} }; // polymorphic
int main()
{
Base b;
Base *ary[] = { &b, &b, &b};
int iter = 0;
typeid(*ary[iter++]);
if (iter != 1) // should be 1
__builtin_abort(); // but 2
}