rtl_data.x_nonlocal_goto_handler_labels becomes an rtx_expr_list

gcc/
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 **.

	* cfgbuild.c (make_edges): In loop over
	nonlocal_goto_handler_labels, strengthen local "x" from rtx to
	rtx_expr_list *, and use methods of the latter class to clarify
	the code.
	* cfgrtl.c (cfg_layout_initialize): Strengthen local "x" from rtx to
	rtx_expr_list *, and use methods of the latter class to clarify
	the code.
	* dwarf2cfi.c (create_trace_edges): Likewise for local "lab".
	* reload1.c (set_initial_label_offsets): Likewise for local "x".
	* rtlanal.c (remove_node_from_expr_list): Strengthen param "listp"
	from rtx * to rtx_expr_list **.  Strengthen local "temp" from rtx
	to rtx_expr_list *.  Use methods of the latter class to clarify
	the code.

From-SVN: r214603

gcc/ChangeLog

 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 **.
+
+	* cfgbuild.c (make_edges): In loop over
+	nonlocal_goto_handler_labels, strengthen local "x" from rtx to
+	rtx_expr_list *, and use methods of the latter class to clarify
+	the code.
+	* cfgrtl.c (cfg_layout_initialize): Strengthen local "x" from rtx to
+	rtx_expr_list *, and use methods of the latter class to clarify
+	the code.
+	* dwarf2cfi.c (create_trace_edges): Likewise for local "lab".
+	* reload1.c (set_initial_label_offsets): Likewise for local "x".
+	* rtlanal.c (remove_node_from_expr_list): Strengthen param "listp"
+	from rtx * to rtx_expr_list **.  Strengthen local "temp" from rtx
+	to rtx_expr_list *.  Use methods of the latter class to clarify
+	the code.
+
+2014-08-27  David Malcolm  <dmalcolm@redhat.com>
+
 	* function.h (struct expr_status): Strengthen field
 	"x_forced_labels" from rtx to rtx_expr_list *.
 

gcc/cfgbuild.c

@@ -337,8 +337,10 @@ make_edges (basic_block min, basic_block max, int update_p)
 		     taken, then only calls to those functions or to other
 		     nested functions that use them could possibly do
 		     nonlocal gotos.  */
-		  for (rtx x = nonlocal_goto_handler_labels; x; x = XEXP (x, 1))
-		    make_label_edge (edge_cache, bb, XEXP (x, 0),
+		  for (rtx_expr_list *x = nonlocal_goto_handler_labels;
+		       x;
+		       x = x->next ())
+		    make_label_edge (edge_cache, bb, x->element (),
 				     EDGE_ABNORMAL | EDGE_ABNORMAL_CALL);
 		}
 

gcc/cfgrtl.c

@@ -4216,7 +4216,7 @@ cfg_layout_duplicate_bb (basic_block bb)
 void
 cfg_layout_initialize (unsigned int flags)
 {
-  rtx x;
+  rtx_expr_list *x;
   basic_block bb;
 
   /* Once bb partitioning is complete, cfg layout mode should not be
@@ -4235,9 +4235,9 @@ cfg_layout_initialize (unsigned int flags)
   record_effective_endpoints ();
 
   /* Make sure that the targets of non local gotos are marked.  */
-  for (x = nonlocal_goto_handler_labels; x; x = XEXP (x, 1))
+  for (x = nonlocal_goto_handler_labels; x; x = x->next ())
     {
-      bb = BLOCK_FOR_INSN (XEXP (x, 0));
+      bb = BLOCK_FOR_INSN (x->element ());
       bb->flags |= BB_NON_LOCAL_GOTO_TARGET;
     }
 

gcc/dwarf2cfi.c

@@ -2338,8 +2338,10 @@ create_trace_edges (rtx insn)
 
       /* Process non-local goto edges.  */
       if (can_nonlocal_goto (insn))
-	for (rtx lab = nonlocal_goto_handler_labels; lab; lab = XEXP (lab, 1))
-	  maybe_record_trace_start_abnormal (XEXP (lab, 0), insn);
+	for (rtx_expr_list *lab = nonlocal_goto_handler_labels;
+	     lab;
+	     lab = lab->next ())
+	  maybe_record_trace_start_abnormal (lab->element (), insn);
     }
   else if (rtx_sequence *seq = dyn_cast <rtx_sequence *> (PATTERN (insn)))
     {

gcc/function.h

@@ -266,7 +266,7 @@ struct GTY(()) rtl_data {
 
   /* List (chain of EXPR_LIST) of labels heading the current handlers for
      nonlocal gotos.  */
-  rtx x_nonlocal_goto_handler_labels;
+  rtx_expr_list *x_nonlocal_goto_handler_labels;
 
   /* Label that will go on function epilogue.
      Jumping to this label serves as a "return" instruction

gcc/reload1.c

@@ -3915,9 +3915,9 @@ set_initial_label_offsets (void)
     if (x->element ())
       set_label_offsets (x->element (), NULL, 1);
 
-  for (rtx x = nonlocal_goto_handler_labels; x; x = XEXP (x, 1))
-    if (XEXP (x, 0))
-      set_label_offsets (XEXP (x, 0), NULL, 1);
+  for (rtx_expr_list *x = nonlocal_goto_handler_labels; x; x = x->next ())
+    if (x->element ())
+      set_label_offsets (x->element (), NULL, 1);
 
   for_each_eh_label (set_initial_eh_label_offset);
 }

gcc/rtl.h

@@ -2828,7 +2828,7 @@ extern unsigned hash_rtx_cb (const_rtx, enum machine_mode, int *, int *,
 extern rtx regno_use_in (unsigned int, rtx);
 extern int auto_inc_p (const_rtx);
 extern int in_expr_list_p (const_rtx, const_rtx);
-extern void remove_node_from_expr_list (const_rtx, rtx *);
+extern void remove_node_from_expr_list (const_rtx, rtx_expr_list **);
 extern int loc_mentioned_in_p (rtx *, const_rtx);
 extern rtx_insn *find_first_parameter_load (rtx, rtx);
 extern bool keep_with_call_p (const_rtx);

gcc/rtlanal.c

@@ -2134,26 +2134,26 @@ in_expr_list_p (const_rtx listp, const_rtx node)
    A simple equality test is used to determine if NODE matches.  */
 
 void
-remove_node_from_expr_list (const_rtx node, rtx *listp)
+remove_node_from_expr_list (const_rtx node, rtx_expr_list **listp)
 {
-  rtx temp = *listp;
+  rtx_expr_list *temp = *listp;
   rtx prev = NULL_RTX;
 
   while (temp)
     {
-      if (node == XEXP (temp, 0))
+      if (node == temp->element ())
 	{
 	  /* Splice the node out of the list.  */
 	  if (prev)
-	    XEXP (prev, 1) = XEXP (temp, 1);
+	    XEXP (prev, 1) = temp->next ();
 	  else
-	    *listp = XEXP (temp, 1);
+	    *listp = temp->next ();
 
 	  return;
 	}
 
       prev = temp;
-      temp = XEXP (temp, 1);
+      temp = temp->next ();
     }
 }