tree.c: add [cd]tors to free_lang_data_d

gcc/ChangeLog:

2016-07-12  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (struct free_lang_data_d): Add constructor and change
	types of members to ones that automatically manage resources.
	(fld_worklist_push): Adjust.
	(find_decls_types): Likewise.
	(find_decls_types_in_eh_region): Likewise.
	(free_lang_data_in_cgraph): Stop manually creating and
	destroying members of free_lang_data_d.

From-SVN: r238278

gcc/ChangeLog

+2016-07-12  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
+
+	* tree.c (struct free_lang_data_d): Add constructor and change
+	types of members to ones that automatically manage resources.
+	(fld_worklist_push): Adjust.
+	(find_decls_types): Likewise.
+	(find_decls_types_in_eh_region): Likewise.
+	(free_lang_data_in_cgraph): Stop manually creating and
+	destroying members of free_lang_data_d.
+
 2016-07-13  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR rtl-optimization/68961

gcc/tree.c

@@ -5500,17 +5500,19 @@ free_lang_data_in_decl (tree decl)
 
 struct free_lang_data_d
 {
+  free_lang_data_d () : decls (100), types (100) {}
+
   /* Worklist to avoid excessive recursion.  */
-  vec<tree> worklist;
+  auto_vec<tree> worklist;
 
   /* Set of traversed objects.  Used to avoid duplicate visits.  */
-  hash_set<tree> *pset;
+  hash_set<tree> pset;
 
   /* Array of symbols to process with free_lang_data_in_decl.  */
-  vec<tree> decls;
+  auto_vec<tree> decls;
 
   /* Array of types to process with free_lang_data_in_type.  */
-  vec<tree> types;
+  auto_vec<tree> types;
 };
 
 
@@ -5569,7 +5571,7 @@ add_tree_to_fld_list (tree t, struct free_lang_data_d *fld)
 static inline void
 fld_worklist_push (tree t, struct free_lang_data_d *fld)
 {
-  if (t && !is_lang_specific (t) && !fld->pset->contains (t))
+  if (t && !is_lang_specific (t) && !fld->pset.contains (t))
     fld->worklist.safe_push ((t));
 }
 
@@ -5738,8 +5740,8 @@ find_decls_types (tree t, struct free_lang_data_d *fld)
 {
   while (1)
     {
-      if (!fld->pset->contains (t))
-	walk_tree (&t, find_decls_types_r, fld, fld->pset);
+      if (!fld->pset.contains (t))
+	walk_tree (&t, find_decls_types_r, fld, &fld->pset);
       if (fld->worklist.is_empty ())
 	break;
       t = fld->worklist.pop ();
@@ -5793,7 +5795,7 @@ find_decls_types_in_eh_region (eh_region r, struct free_lang_data_d *fld)
 	for (c = r->u.eh_try.first_catch; c ; c = c->next_catch)
 	  {
 	    c->type_list = get_eh_types_for_runtime (c->type_list);
-	    walk_tree (&c->type_list, find_decls_types_r, fld, fld->pset);
+	    walk_tree (&c->type_list, find_decls_types_r, fld, &fld->pset);
 	  }
       }
       break;
@@ -5801,12 +5803,12 @@ find_decls_types_in_eh_region (eh_region r, struct free_lang_data_d *fld)
     case ERT_ALLOWED_EXCEPTIONS:
       r->u.allowed.type_list
 	= get_eh_types_for_runtime (r->u.allowed.type_list);
-      walk_tree (&r->u.allowed.type_list, find_decls_types_r, fld, fld->pset);
+      walk_tree (&r->u.allowed.type_list, find_decls_types_r, fld, &fld->pset);
       break;
 
     case ERT_MUST_NOT_THROW:
       walk_tree (&r->u.must_not_throw.failure_decl,
-		 find_decls_types_r, fld, fld->pset);
+		 find_decls_types_r, fld, &fld->pset);
       break;
     }
 }
@@ -5948,12 +5950,6 @@ free_lang_data_in_cgraph (void)
   unsigned i;
   alias_pair *p;
 
-  /* Initialize sets and arrays to store referenced decls and types.  */
-  fld.pset = new hash_set<tree>;
-  fld.worklist.create (0);
-  fld.decls.create (100);
-  fld.types.create (100);
-
   /* Find decls and types in the body of every function in the callgraph.  */
   FOR_EACH_FUNCTION (n)
     find_decls_types_in_node (n, &fld);
@@ -5983,11 +5979,6 @@ free_lang_data_in_cgraph (void)
       FOR_EACH_VEC_ELT (fld.types, i, t)
 	verify_type (t);
     }
-
-  delete fld.pset;
-  fld.worklist.release ();
-  fld.decls.release ();
-  fld.types.release ();
 }