--- a/gcc/tree.def	Fri Feb 12 23:41:23 2010 +0900
+++ b/gcc/tree.def	Mon May 24 12:47:05 2010 +0900
@@ -1,7 +1,7 @@
 /* This file contains the definitions and documentation for the
    tree codes used in GCC.
    Copyright (C) 1987, 1988, 1993, 1995, 1997, 1998, 2000, 2001, 2004, 2005,
-   2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+   2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -432,16 +432,13 @@
    or 0 if the alignment is unknown.  */
 DEFTREECODE (MISALIGNED_INDIRECT_REF, "misaligned_indirect_ref", tcc_reference, 2)
 
-/* Used to represent lookup of runtime type dependent data.  Often this is
-   a reference to a vtable, but it needn't be.  Operands are:
+/* Used to represent lookup in a virtual method table which is dependent on
+   the runtime type of an object.  Operands are:
    OBJ_TYPE_REF_EXPR: An expression that evaluates the value to use.
    OBJ_TYPE_REF_OBJECT: Is the object on whose behalf the lookup is
    being performed.  Through this the optimizers may be able to statically
    determine the dynamic type of the object.
-   OBJ_TYPE_REF_TOKEN: Something front-end specific used to resolve the
-   reference to something simpler, usually to the address of a DECL.
-   Never touched by the middle-end.  Good choices would be either an
-   identifier or a vtable index.  */
+   OBJ_TYPE_REF_TOKEN: An integer index to the virtual method table.  */
 DEFTREECODE (OBJ_TYPE_REF, "obj_type_ref", tcc_expression, 3)
 
 /* Constructor: return an aggregate value made from specified components.
@@ -567,11 +564,11 @@
    BLKmode, because it will not be forced out of memory.  */
 DEFTREECODE (CLEANUP_POINT_EXPR, "cleanup_point_expr", tcc_expression, 1)
 
-/* The following two codes are used in languages that have types where
-   some field in an object of the type contains a value that is used in
-   the computation of another field's offset or size and/or the size of
-   the type.  The positions and/or sizes of fields can vary from object
-   to object of the same type or even for one and the same object within
+/* The following code is used in languages that have types where some
+   field in an object of the type contains a value that is used in the
+   computation of another field's offset or size and/or the size of the
+   type.  The positions and/or sizes of fields can vary from object to
+   object of the same type or even for one and the same object within
    its scope.
 
    Record types with discriminants in Ada or schema types in Pascal are