optimize.c (build_delete_destructor_body): New function.

	* cp/optimize.c (build_delete_destructor_body): New function.
	(maybe_clone_body): Call build_delete_destructor_body for
	deleting destructor.

From-SVN: r151673

gcc/cp/ChangeLog

+2009-09-13  Wei Guozhi  <carrot@google.com>
+
+	PR c++/3187
+	* cp/optimize.c (build_delete_destructor_body): New function.
+	(maybe_clone_body): Call build_delete_destructor_body for
+	deleting destructor.
+
 2009-09-10  Jason Merrill  <jason@redhat.com>
 
 	* repo.c (extract_string, get_base_filename, init_repo): constify.

gcc/cp/optimize.c

 /* Perform optimizations on tree structure.
-   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008
+   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009
    Free Software Foundation, Inc.
    Written by Mark Michell (mark@codesourcery.com).
 
@@ -106,6 +106,41 @@ clone_body (tree clone, tree fn, void *arg_map)
   append_to_statement_list_force (stmts, &DECL_SAVED_TREE (clone));
 }
 
+/* DELETE_DTOR is a delete destructor whose body will be built.
+   COMPLETE_DTOR is the corresponding complete destructor.  */
+
+static void
+build_delete_destructor_body (tree delete_dtor, tree complete_dtor)
+{
+  tree call_dtor, call_delete;
+  tree parm = DECL_ARGUMENTS (delete_dtor);
+  tree virtual_size = cxx_sizeof (current_class_type);
+
+  /* Call the corresponding complete destructor.  */
+  gcc_assert (complete_dtor);
+  call_dtor = build_cxx_call (complete_dtor, 1, &parm);
+  add_stmt (call_dtor);
+
+  add_stmt (build_stmt (0, LABEL_EXPR, cdtor_label));
+
+  /* Call the delete function.  */
+  call_delete = build_op_delete_call (DELETE_EXPR, current_class_ptr,
+                                      virtual_size,
+                                      /*global_p=*/false,
+                                      /*placement=*/NULL_TREE,
+                                      /*alloc_fn=*/NULL_TREE);
+  add_stmt (call_delete);
+
+  /* Return the address of the object.  */
+  if (targetm.cxx.cdtor_returns_this ())
+    {
+      tree val = DECL_ARGUMENTS (delete_dtor);
+      val = build2 (MODIFY_EXPR, TREE_TYPE (val),
+                    DECL_RESULT (delete_dtor), val);
+      add_stmt (build_stmt (0, RETURN_EXPR, val));
+    }
+}
+
 /* FN is a function that has a complete body.  Clone the body as
    necessary.  Returns nonzero if there's no longer any need to
    process the main body.  */
@@ -114,6 +149,7 @@ bool
 maybe_clone_body (tree fn)
 {
   tree clone;
+  tree complete_dtor = NULL_TREE;
   bool first = true;
 
   /* We only clone constructors and destructors.  */
@@ -124,6 +160,15 @@ maybe_clone_body (tree fn)
   /* Emit the DWARF1 abstract instance.  */
   (*debug_hooks->deferred_inline_function) (fn);
 
+  /* Look for the complete destructor which may be used to build the
+     delete destructor.  */
+  FOR_EACH_CLONE (clone, fn)
+    if (DECL_NAME (clone) == complete_dtor_identifier)
+      {
+        complete_dtor = clone;
+        break;
+      }
+
   /* We know that any clones immediately follow FN in the TYPE_METHODS
      list.  */
   push_to_top_level ();
@@ -176,6 +221,12 @@ maybe_clone_body (tree fn)
       /* Start processing the function.  */
       start_preparsed_function (clone, NULL_TREE, SF_PRE_PARSED);
 
+      /* Build the delete destructor by calling complete destructor
+         and delete function.  */
+      if (DECL_NAME (clone) == deleting_dtor_identifier)
+        build_delete_destructor_body (clone, complete_dtor);
+      else
+        {
           /* Remap the parameters.  */
           decl_map = pointer_map_create ();
           for (parmno = 0,
@@ -224,11 +275,13 @@ maybe_clone_body (tree fn)
               clone_parm = DECL_RESULT (clone);
               *pointer_map_insert (decl_map, parm) = clone_parm;
             }
+
           /* Clone the body.  */
           clone_body (clone, fn, decl_map);
 
           /* Clean up.  */
           pointer_map_destroy (decl_map);
+        }
 
       /* The clone can throw iff the original function can throw.  */
       cp_function_chain->can_throw = !TREE_NOTHROW (fn);