cp-tree.h (CAN_HAVE_FULL_LANG_DECL_P): New macro.

	* cp-tree.h (CAN_HAVE_FULL_LANG_DECL_P): New macro.
	* class.c (build_vtable): Use build_lang_field_decl to build the
	VAR_DECLs for vtables.
	(prepare_fresh_vtable): Likewise.
	* decl.c (duplicate_decls): Only copy DECL_SAVED_TREE if
	CAN_HAVE_FULL_LANG_DECL_P.
	(push_using_decl): Use build_lang_decl to build USING_DECLs.
	(grokdeclarator): Use build_lang_decl to build TYPE_DECLs.
	* lex.c (retrofit_lang_decl): Check CAN_HAVE_FULL_LANG_DECL_P.
	(build_lang_field_decl): Likewise.
	(copy_lang_decl): Use CAN_HAVE_FULLLANG_DECL_P to decide how much
	to copy.

From-SVN: r28731

gcc/cp/ChangeLog

 1999-08-16  Mark Mitchell  <mark@codesourcery.com>
 
+	* cp-tree.h (CAN_HAVE_FULL_LANG_DECL_P): New macro.
+	* class.c (build_vtable): Use build_lang_field_decl to build the
+	VAR_DECLs for vtables.
+	(prepare_fresh_vtable): Likewise.
+	* decl.c (duplicate_decls): Only copy DECL_SAVED_TREE if
+	CAN_HAVE_FULL_LANG_DECL_P.
+	(push_using_decl): Use build_lang_decl to build USING_DECLs.
+	(grokdeclarator): Use build_lang_decl to build TYPE_DECLs.
+	* lex.c (retrofit_lang_decl): Check CAN_HAVE_FULL_LANG_DECL_P.
+	(build_lang_field_decl): Likewise.
+	(copy_lang_decl): Use CAN_HAVE_FULLLANG_DECL_P to decide how much
+	to copy.
+	
 	* cp-tree.def (STMT_EXPR): New tree node.
 	* cp-tree.h (STMT_EXPR_STMT): New macro.
 	(store_return_init): Change prototype.

gcc/cp/class.c

@@ -737,7 +737,8 @@ build_vtable (binfo, type)
       tree offset;
 
       virtuals = copy_list (BINFO_VIRTUALS (binfo));
-      decl = build_lang_decl (VAR_DECL, name, TREE_TYPE (BINFO_VTABLE (binfo)));
+      decl = build_lang_field_decl (VAR_DECL, name, 
+				    TREE_TYPE (BINFO_VTABLE (binfo)));
 
       /* Now do rtti stuff.  */
       offset = get_derived_offset (TYPE_BINFO (type), NULL_TREE);
@@ -747,7 +748,7 @@ build_vtable (binfo, type)
   else
     {
       virtuals = NULL_TREE;
-      decl = build_lang_decl (VAR_DECL, name, void_type_node);
+      decl = build_lang_field_decl (VAR_DECL, name, void_type_node);
     }
 
 #ifdef GATHER_STATISTICS
@@ -897,7 +898,7 @@ prepare_fresh_vtable (binfo, for_type)
       buf2 = new_buf2;
     }
 
-  new_decl = build_lang_decl (VAR_DECL, name, TREE_TYPE (orig_decl));
+  new_decl = build_lang_field_decl (VAR_DECL, name, TREE_TYPE (orig_decl));
   /* Remember which class this vtable is really for.  */
   DECL_CONTEXT (new_decl) = for_type;
 

gcc/cp/cp-tree.h

@@ -1153,12 +1153,14 @@ struct lang_type
 
 
 /* If a DECL has DECL_LANG_SPECIFIC, it is either a lang_decl_flags or
-   a lang_decl (which has lang_decl_flags as its initial prefix).  A
-   FUNCTION_DECL, NAMESPACE_DECL, TYPE_DECL, or USING_DECL may have a
-   full lang_decl.  A FIELD_DECL, or a static data member VAR_DECL,
-   will have only lang_decl_flags.  Thus, one should only access the
-   members of lang_decl that are not in lang_decl_flags for DECLs that
-   are not FIELD_DECLs or VAR_DECLs.  */
+   a lang_decl (which has lang_decl_flags as its initial prefix).
+   This macro is nonzero for tree nodes whose DECL_LANG_SPECIFIC is
+   the full lang_decl, and not just lang_decl_flags.  */
+#define CAN_HAVE_FULL_LANG_DECL_P(NODE)		\
+  (!(TREE_CODE ((NODE)) == VAR_DECL		\
+     || TREE_CODE ((NODE)) == CONST_DECL	\
+     || TREE_CODE ((NODE)) == FIELD_DECL 	\
+     || TREE_CODE ((NODE)) == USING_DECL))
 
 struct lang_decl_flags
 {

gcc/cp/decl.c

@@ -3523,7 +3523,8 @@ duplicate_decls (newdecl, olddecl)
 	  DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
 	  DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
 	  DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
-	  if (DECL_LANG_SPECIFIC (newdecl)
+	  if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
+	      && DECL_LANG_SPECIFIC (newdecl)
 	      && DECL_LANG_SPECIFIC (olddecl))
 	    DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
 	}
@@ -4474,7 +4475,7 @@ push_using_decl (scope, name)
       break;
   if (decl)
     return NULL_TREE;
-  decl = build_lang_decl (USING_DECL, name, void_type_node);
+  decl = build_lang_field_decl (USING_DECL, name, void_type_node);
   DECL_INITIAL (decl) = scope;
   TREE_CHAIN (decl) = current_binding_level->usings;
   current_binding_level->usings = decl;
@@ -10553,7 +10554,7 @@ grokdeclarator (declarator, declspecs, decl_context, initialized, attrlist)
 	  if (type != error_mark_node)
 	    push_obstacks (TYPE_OBSTACK (type), TYPE_OBSTACK (type));
 	  if (processing_template_decl)
-	    decl = build_lang_field_decl (TYPE_DECL, declarator, type);
+	    decl = build_lang_decl (TYPE_DECL, declarator, type);
 	  else
 	    decl = build_decl (TYPE_DECL, declarator, type);
 	  if (type != error_mark_node)

gcc/cp/lex.c

@@ -4742,6 +4742,8 @@ retrofit_lang_decl (t)
   struct obstack *obstack = current_obstack;
   struct lang_decl *ld;
 
+  my_friendly_assert (CAN_HAVE_FULL_LANG_DECL_P (t), 19990816);
+
   if (! TREE_PERMANENT (t))
     obstack = saveable_obstack;
   else
@@ -4795,6 +4797,8 @@ build_lang_field_decl (code, name, type)
   else
     my_friendly_assert (obstack == &permanent_obstack, 235);
 
+  my_friendly_assert (!CAN_HAVE_FULL_LANG_DECL_P (t), 19990816);
+
   DECL_LANG_SPECIFIC (t) 
     = ((struct lang_decl *) 
        obstack_alloc (obstack, sizeof (struct lang_decl_flags)));
@@ -4812,7 +4816,7 @@ copy_lang_decl (node)
   if (! DECL_LANG_SPECIFIC (node))
     return;
 
-  if (TREE_CODE (node) == FIELD_DECL)
+  if (!CAN_HAVE_FULL_LANG_DECL_P (node))
     size = sizeof (struct lang_decl_flags);
   else
     size = sizeof (struct lang_decl);