* tree.h (TYPE_BINFO): Document.

From-SVN: r22627

gcc/ChangeLog

+Mon Sep 28 14:24:03 1998  Mark Mitchell  <mark@markmitchell.com>
+
+	* tree.h (TYPE_BINFO): Document.
+
 Mon Sep 28 12:55:49 1998   Stan Cox  <scox@cygnus.com>
 
 	* i386-coff.h (dbxcoff.h): Added.

gcc/tree.h

@@ -787,12 +787,16 @@ struct tree_block
 #define TYPE_NAME(NODE) (TYPE_CHECK (NODE)->type.name)
 #define TYPE_NEXT_VARIANT(NODE) (TYPE_CHECK (NODE)->type.next_variant)
 #define TYPE_MAIN_VARIANT(NODE) (TYPE_CHECK (NODE)->type.main_variant)
-#define TYPE_BINFO(NODE) (TYPE_CHECK (NODE)->type.binfo)
 #define TYPE_NONCOPIED_PARTS(NODE) (TYPE_CHECK (NODE)->type.noncopied_parts)
 #define TYPE_CONTEXT(NODE) (TYPE_CHECK (NODE)->type.context)
 #define TYPE_OBSTACK(NODE) (TYPE_CHECK (NODE)->type.obstack)
 #define TYPE_LANG_SPECIFIC(NODE) (TYPE_CHECK (NODE)->type.lang_specific)
 
+/* For aggregate types, information about this type, as a base type
+   for itself.  Used in a language-dependent way for types that are
+   neither a RECORD_TYPE, QUAL_UNION_TYPE, nor a UNION_TYPE.  */
+#define TYPE_BINFO(NODE) (TYPE_CHECK (NODE)->type.binfo)
+
 /* The (language-specific) typed-based alias set for this type.
    Objects whose TYPE_ALIAS_SETs are different cannot alias each
    other.  If the TYPE_ALIAS_SET is -1, no alias set has yet been