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re PR sanitizer/64717 (-fsanitize=vptr leads to warning: ‘<anonymous>’ may be used uninitialized in this function [-Wmaybe-uninitialized])

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PR c++/64717
	* cp-ubsan.c (cp_ubsan_instrument_vptr): Don't wrap vptr
	into SAVE_EXPR.

	* g++.dg/ubsan/pr64717-1.C: New test.
	* g++.dg/ubsan/pr64717-2.C: New test.

From-SVN: r220262
This commit is contained in:
Jakub Jelinek 2015-01-29 21:40:07 +01:00
parent d240f6b36a
commit a7c3e87ed9
5 changed files with 48 additions and 2 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2015-01-29 Jakub Jelinek <jakub@redhat.com>
PR c++/64717
* cp-ubsan.c (cp_ubsan_instrument_vptr): Don't wrap vptr
into SAVE_EXPR.
2015-01-29 Jason Merrill <jason@redhat.com>
PR c++/49508

1
gcc/cp/cp-ubsan.c
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@ -107,7 +107,6 @@ cp_ubsan_instrument_vptr (location_t loc, tree op, tree type, bool is_addr,
fold_build2 (NE_EXPR, boolean_type_node, op,
build_zero_cst (TREE_TYPE (op))),
vptr, build_int_cst (uint64_type_node, 0));
vptr = build1_loc (loc, SAVE_EXPR, uint64_type_node, vptr);
tree ti_decl = get_tinfo_decl (type);
mark_used (ti_decl);
tree ptype = build_pointer_type (type);

8
gcc/testsuite/ChangeLog
View File

@ -1,4 +1,10 @@
2015-22-01 Uros Bizjak <ubizjak@gmail.com>
2015-01-29 Jakub Jelinek <jakub@redhat.com>
PR c++/64717
* g++.dg/ubsan/pr64717-1.C: New test.
* g++.dg/ubsan/pr64717-2.C: New test.
2015-01-29 Uros Bizjak <ubizjak@gmail.com>
* gcc.dg/tree-ssa/pr64801.c: Fix scan-tree-dump-not directive.

15
gcc/testsuite/g++.dg/ubsan/pr64717-1.C Normal file
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@ -0,0 +1,15 @@
// PR c++/64717
// { dg-do compile }
// { dg-options "-O2 -Wuninitialized -fsanitize=vptr" }
class Foo {};
Foo make_foo ();
struct Handle { virtual ~Handle (); };
Handle open (Foo);
void
bar ()
{
Handle file (open (make_foo ())); // { dg-bogus "is used uninitialized" }
}

20
gcc/testsuite/g++.dg/ubsan/pr64717-2.C Normal file
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@ -0,0 +1,20 @@
// PR c++/64717
// { dg-do compile }
// { dg-options "-O2 -Wuninitialized -fsanitize=vptr" }
class ios {};
struct stringstream : virtual ios {
stringstream (char *);
~stringstream ();
};
struct string { char *c_str (); };
string make_str ();
void
bar ()
{
stringstream param (make_str ().c_str ()); // { dg-bogus "is used uninitialized" }
}