rtl_data.x_stack_slot_list becomes an rtx_expr_list

gcc/
2014-08-27  David Malcolm  <dmalcolm@redhat.com>

	* function.h (struct rtl_data): Strengthen field
	"x_stack_slot_list" from rtx to rtx_expr_list *.

	* emit-rtl.c (unshare_all_rtl_1): Add a checked cast
	when assigning to stack_slot_list.

From-SVN: r214604

gcc/ChangeLog

 2014-08-27  David Malcolm  <dmalcolm@redhat.com>
 
 	* function.h (struct rtl_data): Strengthen field
+	"x_stack_slot_list" from rtx to rtx_expr_list *.
+
+	* emit-rtl.c (unshare_all_rtl_1): Add a checked cast
+	when assigning to stack_slot_list.
+
+2014-08-27  David Malcolm  <dmalcolm@redhat.com>
+
+	* function.h (struct rtl_data): Strengthen field
 	x_nonlocal_goto_handler_labels from rtx to rtx_expr_list *.
 	* rtl.h (remove_node_from_expr_list): Strengthen second param from
 	rtx * to rtx_expr_list **.

gcc/emit-rtl.c

@@ -2555,7 +2555,8 @@ unshare_all_rtl_1 (rtx_insn *insn)
      This special care is necessary when the stack slot MEM does not
      actually appear in the insn chain.  If it does appear, its address
      is unshared from all else at that point.  */
-  stack_slot_list = copy_rtx_if_shared (stack_slot_list);
+  stack_slot_list = safe_as_a <rtx_expr_list *> (
+		      copy_rtx_if_shared (stack_slot_list));
 }
 
 /* Go through all the RTL insn bodies and copy any invalid shared

gcc/function.h

@@ -280,7 +280,7 @@ struct GTY(()) rtl_data {
 
   /* List (chain of EXPR_LISTs) of all stack slots in this function.
      Made for the sake of unshare_all_rtl.  */
-  rtx x_stack_slot_list;
+  rtx_expr_list *x_stack_slot_list;
 
   /* List of empty areas in the stack frame.  */
   struct frame_space *frame_space_list;