trans.h (struct gfc_ss_info): New field refcount.

	* trans.h (struct gfc_ss_info): New field refcount.
	* trans-array.c (free_ss_info): Decrement refcount. Return early if
	still non-zero.
	(gfc_get_array_ss, gfc_get_temp_ss, gfc_get_scalar_ss): Increment
	refcount.

From-SVN: r180883

gcc/fortran/ChangeLog

 2011-11-03  Mikael Morin  <mikael@gcc.gnu.org>
 
+	* trans.h (struct gfc_ss_info): New field refcount.
+	* trans-array.c (free_ss_info): Decrement refcount. Return early if
+	still non-zero.
+	(gfc_get_array_ss, gfc_get_temp_ss, gfc_get_scalar_ss): Increment
+	refcount.
+
+2011-11-03  Mikael Morin  <mikael@gcc.gnu.org>
+
 	* trans-array.c (gfc_trans_create_temp_array): Move invariant condition
 	out of the containing loop. 
 

gcc/fortran/trans-array.c

@@ -489,6 +489,11 @@ gfc_free_ss_chain (gfc_ss * ss)
 static void
 free_ss_info (gfc_ss_info *ss_info)
 {
+  ss_info->refcount--;
+  if (ss_info->refcount > 0)
+    return;
+
+  gcc_assert (ss_info->refcount == 0);
   free (ss_info);
 }
 
@@ -532,6 +537,7 @@ gfc_get_array_ss (gfc_ss *next, gfc_expr *expr, int dimen, gfc_ss_type type)
   int i;
 
   ss_info = gfc_get_ss_info ();
+  ss_info->refcount++;
   ss_info->type = type;
   ss_info->expr = expr;
 
@@ -556,6 +562,7 @@ gfc_get_temp_ss (tree type, tree string_length, int dimen)
   int i;
 
   ss_info = gfc_get_ss_info ();
+  ss_info->refcount++;
   ss_info->type = GFC_SS_TEMP;
   ss_info->string_length = string_length;
   ss_info->data.temp.type = type;
@@ -580,6 +587,7 @@ gfc_get_scalar_ss (gfc_ss *next, gfc_expr *expr)
   gfc_ss_info *ss_info;
 
   ss_info = gfc_get_ss_info ();
+  ss_info->refcount++;
   ss_info->type = GFC_SS_SCALAR;
   ss_info->expr = expr;
 

gcc/fortran/trans.h

@@ -185,6 +185,7 @@ gfc_ss_type;
 
 typedef struct gfc_ss_info
 {
+  int refcount;
   gfc_ss_type type;
   gfc_expr *expr;
   tree string_length;