Use rtx_expr_list for expr_status.x_forced_labels

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

	* function.h (struct expr_status): Strengthen field
	"x_forced_labels" from rtx to rtx_expr_list *.

	* cfgbuild.c (make_edges): Split local "x" into two locals,
	strengthening one from rtx to rtx_expr_list *, and using methods
	of said class.
	* dwarf2cfi.c (create_trace_edges): Split local "lab" out; within
	loop over forced_labels, introduce strengthen it from rtx to
	rtx_expr_list *, using methods to clarify the code.
	* jump.c (rebuild_jump_labels_1): Strengthen local "insn" from rtx
	to rtx_expr_list *, using methods of said class to clarify the
	code.
	* reload1.c (set_initial_label_offsets): Split local "x" into two
	per-loop variables, strengthening the first from rtx to
	rtx_expr_list * and using methods.

From-SVN: r214602

gcc/ChangeLog

 2014-08-27  David Malcolm  <dmalcolm@redhat.com>
 
+	* function.h (struct expr_status): Strengthen field
+	"x_forced_labels" from rtx to rtx_expr_list *.
+
+	* cfgbuild.c (make_edges): Split local "x" into two locals,
+	strengthening one from rtx to rtx_expr_list *, and using methods
+	of said class.
+	* dwarf2cfi.c (create_trace_edges): Split local "lab" out; within
+	loop over forced_labels, introduce strengthen it from rtx to
+	rtx_expr_list *, using methods to clarify the code.
+	* jump.c (rebuild_jump_labels_1): Strengthen local "insn" from rtx
+	to rtx_expr_list *, using methods of said class to clarify the
+	code.
+	* reload1.c (set_initial_label_offsets): Split local "x" into two
+	per-loop variables, strengthening the first from rtx to
+	rtx_expr_list * and using methods.
+
+2014-08-27  David Malcolm  <dmalcolm@redhat.com>
+
 	* coretypes.h (class rtx_expr_list): Add forward declaration.
 	* emit-rtl.c (gen_rtx_EXPR_LIST): New.
 	* gengenrtl.c (special_rtx): Add EXPR_LIST.

gcc/cfgbuild.c

@@ -219,7 +219,6 @@ make_edges (basic_block min, basic_block max, int update_p)
   FOR_BB_BETWEEN (bb, min, max->next_bb, next_bb)
     {
       rtx_insn *insn;
-      rtx x;
       enum rtx_code code;
       edge e;
       edge_iterator ei;
@@ -285,8 +284,8 @@ make_edges (basic_block min, basic_block max, int update_p)
 	     everything on the forced_labels list.  */
 	  else if (computed_jump_p (insn))
 	    {
-	      for (x = forced_labels; x; x = XEXP (x, 1))
-		make_label_edge (edge_cache, bb, XEXP (x, 0), EDGE_ABNORMAL);
+	      for (rtx_expr_list *x = forced_labels; x; x = x->next ())
+		make_label_edge (edge_cache, bb, x->element (), EDGE_ABNORMAL);
 	    }
 
 	  /* Returns create an exit out.  */
@@ -338,7 +337,7 @@ 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 (x = nonlocal_goto_handler_labels; x; x = XEXP (x, 1))
+		  for (rtx x = nonlocal_goto_handler_labels; x; x = XEXP (x, 1))
 		    make_label_edge (edge_cache, bb, XEXP (x, 0),
 				     EDGE_ABNORMAL | EDGE_ABNORMAL_CALL);
 		}

gcc/dwarf2cfi.c

@@ -2286,7 +2286,7 @@ maybe_record_trace_start_abnormal (rtx start, rtx origin)
 static void
 create_trace_edges (rtx insn)
 {
-  rtx tmp, lab;
+  rtx tmp;
   int i, n;
 
   if (JUMP_P (insn))
@@ -2303,14 +2303,14 @@ create_trace_edges (rtx insn)
 	  n = GET_NUM_ELEM (vec);
 	  for (i = 0; i < n; ++i)
 	    {
-	      lab = XEXP (RTVEC_ELT (vec, i), 0);
+	      rtx lab = XEXP (RTVEC_ELT (vec, i), 0);
 	      maybe_record_trace_start (lab, insn);
 	    }
 	}
       else if (computed_jump_p (insn))
 	{
-	  for (lab = forced_labels; lab; lab = XEXP (lab, 1))
-	    maybe_record_trace_start (XEXP (lab, 0), insn);
+	  for (rtx_expr_list *lab = forced_labels; lab; lab = lab->next ())
+	    maybe_record_trace_start (lab->element (), insn);
 	}
       else if (returnjump_p (insn))
 	;
@@ -2319,13 +2319,13 @@ create_trace_edges (rtx insn)
 	  n = ASM_OPERANDS_LABEL_LENGTH (tmp);
 	  for (i = 0; i < n; ++i)
 	    {
-	      lab = XEXP (ASM_OPERANDS_LABEL (tmp, i), 0);
+	      rtx lab = XEXP (ASM_OPERANDS_LABEL (tmp, i), 0);
 	      maybe_record_trace_start (lab, insn);
 	    }
 	}
       else
 	{
-	  lab = JUMP_LABEL (insn);
+	  rtx lab = JUMP_LABEL (insn);
 	  gcc_assert (lab != NULL);
 	  maybe_record_trace_start (lab, insn);
 	}
@@ -2338,7 +2338,7 @@ create_trace_edges (rtx insn)
 
       /* Process non-local goto edges.  */
       if (can_nonlocal_goto (insn))
-	for (lab = nonlocal_goto_handler_labels; lab; lab = XEXP (lab, 1))
+	for (rtx lab = nonlocal_goto_handler_labels; lab; lab = XEXP (lab, 1))
 	  maybe_record_trace_start_abnormal (XEXP (lab, 0), insn);
     }
   else if (rtx_sequence *seq = dyn_cast <rtx_sequence *> (PATTERN (insn)))

gcc/function.h

@@ -135,7 +135,7 @@ struct GTY(()) expr_status {
   rtx x_apply_args_value;
 
   /* List of labels that must never be deleted.  */
-  rtx x_forced_labels;
+  rtx_expr_list *x_forced_labels;
 };
 
 typedef struct call_site_record_d *call_site_record;

gcc/jump.c

@@ -74,7 +74,7 @@ static int returnjump_p_1 (rtx *, void *);
 static void
 rebuild_jump_labels_1 (rtx_insn *f, bool count_forced)
 {
-  rtx insn;
+  rtx_expr_list *insn;
 
   timevar_push (TV_REBUILD_JUMP);
   init_label_info (f);
@@ -85,9 +85,9 @@ rebuild_jump_labels_1 (rtx_insn *f, bool count_forced)
      count doesn't drop to zero.  */
 
   if (count_forced)
-    for (insn = forced_labels; insn; insn = XEXP (insn, 1))
-      if (LABEL_P (XEXP (insn, 0)))
-	LABEL_NUSES (XEXP (insn, 0))++;
+    for (insn = forced_labels; insn; insn = insn->next ())
+      if (LABEL_P (insn->element ()))
+	LABEL_NUSES (insn->element ())++;
   timevar_pop (TV_REBUILD_JUMP);
 }
 

gcc/reload1.c

@@ -3909,14 +3909,13 @@ set_initial_eh_label_offset (rtx label)
 static void
 set_initial_label_offsets (void)
 {
-  rtx x;
   memset (offsets_known_at, 0, num_labels);
 
-  for (x = forced_labels; x; x = XEXP (x, 1))
-    if (XEXP (x, 0))
-      set_label_offsets (XEXP (x, 0), NULL, 1);
+  for (rtx_expr_list *x = forced_labels; x; x = x->next ())
+    if (x->element ())
+      set_label_offsets (x->element (), NULL, 1);
 
-  for (x = nonlocal_goto_handler_labels; x; x = XEXP (x, 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);