Fix memory leaks in graphite

	* graphite-poly.c (free_scop): Release scop->drs vector.
	* graphite-scop-detection.c (scop_detection::harmful_stmt_in_region):
	Release dom vector.
	(try_generate_gimple_bb): Use vNULL as a default initialization
	for vectors.

From-SVN: r230312

gcc/ChangeLog

 2015-11-13  Martin Liska  <mliska@suse.cz>
 
+	* graphite-poly.c (free_scop): Release scop->drs vector.
+	* graphite-scop-detection.c (scop_detection::harmful_stmt_in_region):
+	Release dom vector.
+	(try_generate_gimple_bb): Use vNULL as a default initialization
+	for vectors.
+
+2015-11-13  Martin Liska  <mliska@suse.cz>
+
 	PR ipa/68311
 	* ipa-icf.c (sem_item_optimizer::traverse_congruence_split):
 	Replace ctor with auto_vec and initialization in a loop.

gcc/graphite-poly.c

@@ -328,6 +328,7 @@ free_scop (scop_p scop)
     free_poly_bb (pbb);
 
   scop->pbbs.release ();
+  scop->drs.release ();
 
   isl_set_free (scop->param_context);
   isl_union_map_free (scop->must_raw);

gcc/graphite-scop-detection.c

@@ -522,6 +522,11 @@ class scop_detection
 public:
   scop_detection () : scops (vNULL) {}
 
+  ~scop_detection ()
+  {
+    scops.release ();
+  }
+
   /* A marker for invalid sese_l.  */
   static sese_l invalid_sese;
 
@@ -1065,13 +1070,20 @@ scop_detection::harmful_stmt_in_region (sese_l scop) const
 
       /* The basic block should not be part of an irreducible loop.  */
       if (bb->flags & BB_IRREDUCIBLE_LOOP)
-        return true;
+	{
+	  dom.release ();
+	  return true;
+	}
 
       if (harmful_stmt_in_bb (scop, bb))
-	return true;
+	{
+	  dom.release ();
+	  return true;
+	}
     }
 
-    return false;
+  dom.release ();
+  return false;
 }
 
 /* Returns true if S1 subsumes/surrounds S2.  */
@@ -1749,12 +1761,9 @@ graphite_find_cross_bb_scalar_vars (scop_p scop, gimple *stmt,
 static gimple_poly_bb_p
 try_generate_gimple_bb (scop_p scop, basic_block bb)
 {
-  vec<data_reference_p> drs;
-  drs.create (3);
-  vec<tree> writes;
-  writes.create (3);
-  vec<scalar_use> reads;
-  reads.create (3);
+  vec<data_reference_p> drs = vNULL;
+  vec<tree> writes = vNULL;
+  vec<scalar_use> reads = vNULL;
 
   sese_l region = scop->scop_info->region;
   loop_p nest = outermost_loop_in_sese (region, bb);