* unwind-dw2.c (execute_stack_op): Handle DW_OP_swap.

From-SVN: r121165

gcc/ChangeLog

+2007-01-24  Geoffrey Keating  <geoffk@apple.com>
+
+	* unwind-dw2.c (execute_stack_op): Handle DW_OP_swap.
+
 2007-01-24  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	PR middle-end/30447

gcc/unwind-dw2.c

@@ -636,6 +636,16 @@ execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end,
 	  result = stack[stack_elt - 2];
 	  break;
 
+	case DW_OP_swap:
+	  {
+	    _Unwind_Word t;
+	    gcc_assert (stack_elt >= 2);
+	    t = stack[stack_elt - 1];
+	    stack[stack_elt - 1] = stack[stack_elt - 2];
+	    stack[stack_elt - 2] = t;
+	    goto no_push;
+	  }
+
 	case DW_OP_rot:
 	  {
 	    _Unwind_Word t1, t2, t3;