class.c (invalidate_class_lookup_cache): Zero the previous_class_values.

	* class.c (invalidate_class_lookup_cache): Zero the
	previous_class_values.
	* cp-tree.h (TMPL_PARMS_DEPTH): Use TREE_INT_CST_LOW, not
	TREE_INT_CST_HIGH.
	(CLASSTYPE_TEMPLATE_LEVEL): Likewise.
	* decl.c (free_bindings): New variable.
	(push_binding): Don't create a new binding if we have one on the
	free list.
	(pop_binding): Put old bindings on the free list.
	(init_decl_processing): Use size_int, not build_int_2.
	Register free_bindings as a GC root.
	(cp_make_fname_decl): Use size_int, not build_int_2.
	(push_inline_template_parms_recursive): Likewise.
	(end_template_parm_list): Likewise.
	(for_each_tempalte_parm): Do not use walk_tree_without_duplicates.
	(tsubst_template_parms): Use size_int, not build_int_2.
	(tsubst): Likewise.
	* rtti.c (get_vmi_pseudo_type_info): Likewise.

From-SVN: r38641

gcc/cp/ChangeLog

+2001-01-02  Mark Mitchell  <mark@codesourcery.com>
+
+	* class.c (invalidate_class_lookup_cache): Zero the
+	previous_class_values.
+	* cp-tree.h (TMPL_PARMS_DEPTH): Use TREE_INT_CST_LOW, not
+	TREE_INT_CST_HIGH.
+	(CLASSTYPE_TEMPLATE_LEVEL): Likewise.
+	* decl.c (free_bindings): New variable.
+	(push_binding): Don't create a new binding if we have one on the
+	free list.
+	(pop_binding): Put old bindings on the free list.
+	(init_decl_processing): Use size_int, not build_int_2.
+	Register free_bindings as a GC root.
+	(cp_make_fname_decl): Use size_int, not build_int_2.
+	(push_inline_template_parms_recursive): Likewise.
+	(end_template_parm_list): Likewise.
+	(for_each_tempalte_parm): Do not use walk_tree_without_duplicates.
+	(tsubst_template_parms): Use size_int, not build_int_2.
+	(tsubst): Likewise.
+	* rtti.c (get_vmi_pseudo_type_info): Likewise.
+	
 2001-01-02  Richard Henderson  <rth@redhat.com>
 
 	* parse.y (asm): Set ASM_INPUT_P.

gcc/cp/class.c

@@ -5643,12 +5643,11 @@ invalidate_class_lookup_cache ()
 {
   tree t;
   
-  /* This code can be seen as a cache miss.  When we've cached a
-     class' scope's bindings and we can't use them, we need to reset
-     them.  This is it!  */
+  /* The IDENTIFIER_CLASS_VALUEs are no longer valid.  */
   for (t = previous_class_values; t; t = TREE_CHAIN (t))
     IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (t)) = NULL_TREE;
-  
+
+  previous_class_values = NULL_TREE;
   previous_class_type = NULL_TREE;
 }
  

gcc/cp/cp-tree.h

@@ -2346,7 +2346,7 @@ struct lang_decl
 
 /* The number of levels of template parameters given by NODE.  */
 #define TMPL_PARMS_DEPTH(NODE) \
-  (TREE_INT_CST_HIGH (TREE_PURPOSE (NODE)))
+  (TREE_INT_CST_LOW (TREE_PURPOSE (NODE)))
 
 /* The TEMPLATE_DECL instantiated or specialized by NODE.  This
    TEMPLATE_DECL will be the immediate parent, not the most general
@@ -2791,7 +2791,7 @@ extern int flag_new_for_scope;
 /* Accessor macros for C++ template decl nodes.  */
 
 /* The DECL_TEMPLATE_PARMS are a list.  The TREE_PURPOSE of each node
-   is a INT_CST whose TREE_INT_CST_HIGH indicates the level of the
+   is a INT_CST whose TREE_INT_CST_LOW indicates the level of the
    template parameters, with 1 being the outermost set of template
    parameters.  The TREE_VALUE is a vector, whose elements are the
    template parameters at each level.  Each element in the vector is a
@@ -2919,7 +2919,7 @@ extern int flag_new_for_scope;
 #define PRIMARY_TEMPLATE_P(NODE) (DECL_PRIMARY_TEMPLATE (NODE) == NODE)
 
 #define CLASSTYPE_TEMPLATE_LEVEL(NODE) \
-  (TREE_INT_CST_HIGH (TREE_PURPOSE (CLASSTYPE_TI_TEMPLATE (NODE))))
+  (TREE_INT_CST_LOW (TREE_PURPOSE (CLASSTYPE_TI_TEMPLATE (NODE))))
 
 /* Indicates whether or not (and how) a template was expanded for this
    FUNCTION_DECL or VAR_DECL.

gcc/cp/decl.c

@@ -940,6 +940,11 @@ note_level_for_eh ()
 #define BINDING_LEVEL(NODE) \
    (((struct tree_binding*)NODE)->scope.level)
 
+/* A free list of CPLUS_BINDING nodes, connected by their
+   TREE_CHAINs.  */
+
+static tree free_bindings;
+
 /* Make DECL the innermost binding for ID.  The LEVEL is the binding
    level at which this declaration is being bound.  */
 
@@ -951,7 +956,13 @@ push_binding (id, decl, level)
 {
   tree binding;
 
-  binding = make_node (CPLUS_BINDING);
+  if (free_bindings)
+    {
+      binding = free_bindings;
+      free_bindings = TREE_CHAIN (binding);
+    }
+  else
+    binding = make_node (CPLUS_BINDING);
 
   /* Now, fill in the binding information.  */
   BINDING_VALUE (binding) = decl;
@@ -1189,9 +1200,19 @@ pop_binding (id, decl)
     my_friendly_abort (0);
 
   if (!BINDING_VALUE (binding) && !BINDING_TYPE (binding))
-    /* We're completely done with the innermost binding for this
-       identifier.  Unhook it from the list of bindings.  */
-    IDENTIFIER_BINDING (id) = TREE_CHAIN (binding);
+    {
+      /* We're completely done with the innermost binding for this
+	 identifier.  Unhook it from the list of bindings.  */
+      IDENTIFIER_BINDING (id) = TREE_CHAIN (binding);
+
+      /* Add it to the free list.  */
+      TREE_CHAIN (binding) = free_bindings;
+      free_bindings = binding;
+
+      /* Clear the BINDING_LEVEL so the garbage collector doesn't walk
+	 it.  */
+      BINDING_LEVEL (binding) = NULL;
+    }
 }
 
 /* When a label goes out of scope, check to see if that label was used
@@ -6472,7 +6493,7 @@ init_decl_processing ()
   /* Make a type to be the domain of a few array types
      whose domains don't really matter.
      200 is small enough that it always fits in size_t.  */
-  array_domain_type = build_index_type (build_int_2 (200, 0));
+  array_domain_type = build_index_type (size_int (200));
 
   /* Make a type for arrays of characters.
      With luck nothing will ever really depend on the length of this
@@ -6692,6 +6713,7 @@ init_decl_processing ()
 
   ggc_add_tree_root (&current_lang_name, 1);
   ggc_add_tree_root (&static_aggregates, 1);
+  ggc_add_tree_root (&free_bindings, 1);
 }
 
 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
@@ -6715,7 +6737,7 @@ cp_make_fname_decl (id, name, type_dep)
   if (!processing_template_decl)
     type_dep = 0;
   if (!type_dep)
-    domain = build_index_type (build_int_2 (length, 0));
+    domain = build_index_type (size_int (length));
 
   type =  build_cplus_array_type
           (build_qualified_type (char_type_node, TYPE_QUAL_CONST),

gcc/cp/pt.c

@@ -322,7 +322,7 @@ push_inline_template_parms_recursive (parmlist, levels)
 
   ++processing_template_decl;
   current_template_parms
-    = tree_cons (build_int_2 (0, processing_template_decl),
+    = tree_cons (size_int (processing_template_decl),
 		 parms, current_template_parms);
   TEMPLATE_PARMS_FOR_INLINE (current_template_parms) = 1;
 
@@ -1918,7 +1918,7 @@ end_template_parm_list (parms)
   tree saved_parmlist = make_tree_vec (list_length (parms));
 
   current_template_parms
-    = tree_cons (build_int_2 (0, processing_template_decl),
+    = tree_cons (size_int (processing_template_decl),
 		 saved_parmlist, current_template_parms);
 
   for (parm = parms, nparms = 0; 
@@ -4195,6 +4195,7 @@ for_each_template_parm_r (tp, walk_subtrees, d)
 	 explicitly here.  */
       if (for_each_template_parm (TYPE_METHOD_BASETYPE (t), fn, data))
 	return error_mark_node;
+      /* Fall through.  */
 
     case FUNCTION_TYPE:
       /* Check the return type.  */
@@ -4323,10 +4324,14 @@ for_each_template_parm (t, fn, data)
   pfd.fn = fn;
   pfd.data = data;
 
-  /* Walk the tree.  */
-  return walk_tree_without_duplicates (&t, 
-				       for_each_template_parm_r, 
-				       &pfd) != NULL_TREE;
+  /* Walk the tree.  (Conceptually, we would like to walk without
+     duplicates, but for_each_template_parm_r recursively calls
+     for_each_template_parm, so we would need to reorganize a fair
+     bit to use walk_tree_without_duplicates.)  */
+  return walk_tree (&t, 
+		    for_each_template_parm_r, 
+		    &pfd,
+		    NULL) != NULL_TREE;
 }
 
 int
@@ -5315,8 +5320,8 @@ tsubst_template_parms (parms, args, complain)
 	}
       
       *new_parms = 
-	tree_cons (build_int_2 (0, (TMPL_PARMS_DEPTH (parms) 
-				    - TMPL_ARGS_DEPTH (args))),
+	tree_cons (size_int (TMPL_PARMS_DEPTH (parms) 
+			     - TMPL_ARGS_DEPTH (args)),
 		   new_vec, NULL_TREE);
     }
 
@@ -6759,8 +6764,8 @@ tsubst (t, args, complain, in_decl)
 	   c-common.c.  */
 	name = (*decl_printable_name) (current_function_decl, 2);
 	len = strlen (name) + 1;
-	type =  build_array_type (char_type_node,
-				  build_index_type (build_int_2 (len, 0)));
+	type =  build_array_type (char_type_node, 
+				  build_index_type (size_int (len)));
 	str = build_string (len, name);
 	TREE_TYPE (str) = type;
 	return str;

gcc/cp/rtti.c

@@ -1839,7 +1839,7 @@ get_vmi_pseudo_type_info (num_bases)
     return desc;
   
   /* Add number of bases and trailing array of base_class_type_info.  */
-  array_domain = build_index_type (build_int_2 (num_bases, 0));
+  array_domain = build_index_type (size_int (num_bases));
   base_array = build_array_type (base_desc_type_node, array_domain);
 
   push_nested_namespace (abi_node);