expr.c (cplus_expand_expr): Preserve temporaries when expanding STMT_EXPRs.

	* expr.c (cplus_expand_expr): Preserve temporaries when expanding
	STMT_EXPRs.
	* optimize.c (struct inline_data): Add target_exprs field.
	(declare_return_variable): When a function returns an aggregate,
	use the variable declared in the TARGET_EXPR as the remapped
	DECL_RESULT.
	(expand_call_inline): Update the pending target_exprs stack.
	(optimize_function): Initialize the stack.

From-SVN: r33561

1 files changed, 13 insertions, 2 deletions

diff --git a/gcc/cp/expr.c b/gcc/cp/expr.c
index ebf7c94..c47d390 100644
--- a/gcc/cp/expr.c
+++ b/gcc/cp/expr.c
@@ -143,10 +143,21 @@ cplus_expand_expr (exp, target, tmode, modifier)
 
     case STMT_EXPR:
       {
-	tree rtl_expr = expand_start_stmt_expr ();
+	tree rtl_expr;
+	rtx result;
+
+	/* Since expand_expr_stmt calls free_temp_slots after every
+	   expression statement, we must call push_temp_slots here.
+	   Otherwise, any temporaries in use now would be considered
+	   out-of-scope after the first EXPR_STMT from within the
+	   STMT_EXPR.  */
+	push_temp_slots ();
+	rtl_expr = expand_start_stmt_expr ();
 	expand_stmt (STMT_EXPR_STMT (exp));
 	expand_end_stmt_expr (rtl_expr);
-	return expand_expr (rtl_expr, target, tmode, modifier);
+	result = expand_expr (rtl_expr, target, tmode, modifier);
+	pop_temp_slots ();
+	return result;
       }
       break;