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re PR c++/79825 (Uninitialized uses in aggregate copies of empty structs (missed DCE in C++ gimplify))

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2017-03-03  Richard Biener  <rguenther@suse.de>

	PR c++/79825
	* cp-gimplify.c (simple_empty_class_p): Handle EMPTY_CLASS_EXPR.

	* g++.dg/warn/Wuninitialized-8.C: New testcase.

From-SVN: r245866
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Richard Biener 2017-03-03 11:30:32 +00:00 committed by Richard Biener
parent 38801de50f
commit 30d309aaf1
4 changed files with 29 additions and 0 deletions
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5
gcc/cp/ChangeLog
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@ -1,3 +1,8 @@
2017-03-03 Richard Biener <rguenther@suse.de>
PR c++/79825
* cp-gimplify.c (simple_empty_class_p): Handle EMPTY_CLASS_EXPR.
2017-03-03 Marek Polacek <polacek@redhat.com>
PR c++/79791

1
gcc/cp/cp-gimplify.c
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@ -549,6 +549,7 @@ simple_empty_class_p (tree type, tree op)
return
((TREE_CODE (op) == COMPOUND_EXPR
&& simple_empty_class_p (type, TREE_OPERAND (op, 1)))
|| TREE_CODE (op) == EMPTY_CLASS_EXPR
|| is_gimple_lvalue (op)
|| INDIRECT_REF_P (op)
|| (TREE_CODE (op) == CONSTRUCTOR

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-03-03 Richard Biener <rguenther@suse.de>
PR c++/79825
* g++.dg/warn/Wuninitialized-8.C: New testcase.
2017-03-03 Jakub Jelinek <jakub@redhat.com>
* gcc.dg/pr57134.c: Use empty inline asm string literal.

18
gcc/testsuite/g++.dg/warn/Wuninitialized-8.C Normal file
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@ -0,0 +1,18 @@
// { dg-do compile }
// { dg-options "-Wuninitialized" }
struct A;
struct B
{
B(A);
};
struct C
{
template <typename PassT> void m_fn1(PassT p1) { new B(p1); } // { dg-bogus "uninitialized" }
};
struct A {};
void fn1()
{
C a;
a.m_fn1(A());
}