Re: C++ PR 54197: lifetime of reference not properly extended

[Ollie Wild]

On Mon, Aug 13, 2012 at 3:50 PM, Jakub Jelinek <ja...@redhat.com> wrote:
>
> The formatting doesn't match GCC coding conventions in several ways.
> You don't have spaces before (, and ( shouldn't be at the end of line if
> possible.

Updated patch attached.

Ollie

commit d023097c555a6f7cb84685fd7befedb550889d2c
Author: Ollie Wild <a...@google.com>
Date:   Mon Aug 13 15:36:24 2012 -0500

    2012-08-13  Ollie Wild  <a...@google.com>
    
        PR c++/54197
        * gcc/cp/call.c (extend_ref_init_temps_1): Handle COMPOUND_EXPR trees.
        * gcc/testsuite/g++.dg/init/lifetime3.C: New test.

diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 5345f2b..f3a73af 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -8924,6 +8924,12 @@ extend_ref_init_temps_1 (tree decl, tree init, 
VEC(tree,gc) **cleanups)
   tree sub = init;
   tree *p;
   STRIP_NOPS (sub);
+  if (TREE_CODE (sub) == COMPOUND_EXPR)
+    {
+      TREE_OPERAND (sub, 1)
+        = extend_ref_init_temps_1 (decl, TREE_OPERAND (sub, 1), cleanups);
+      return init;
+    }
   if (TREE_CODE (sub) != ADDR_EXPR)
     return init;
   /* Deal with binding to a subobject.  */
diff --git a/gcc/testsuite/g++.dg/init/lifetime3.C 
b/gcc/testsuite/g++.dg/init/lifetime3.C
new file mode 100644
index 0000000..d099699
--- /dev/null
+++ b/gcc/testsuite/g++.dg/init/lifetime3.C
@@ -0,0 +1,37 @@
+// PR c++/26714
+// { dg-do run }
+
+extern "C" void abort();
+
+bool ok = false;
+struct A {
+  A() { }
+  ~A() { if (!ok) abort(); }
+};
+
+struct B {
+  static A foo() { return A(); }
+};
+
+B b_g;
+
+struct scoped_ptr {
+  B* operator->() const { return &b_g; }
+  B* get() const { return &b_g; }
+};
+
+B *get() { return &b_g; }
+
+int main()
+{
+  scoped_ptr f;
+  const A& ref1 = f->foo();
+  const A& ref2 = f.get()->foo();
+  const A& ref3 = get()->foo();
+  const A& ref4 = B::foo();
+  B *pf = f.get();
+  const A& ref5 = pf->foo();
+
+
+  ok = true;
+}