cp-tree.h (vtbl_ptr_type_node): New variable.

	* cp-tree.h (vtbl_ptr_type_node): New variable.
	* class.c (build_vtbl_ref): Don't indirect through the vptr; it's
	already of the right type.
	(finish_struct_1): Make the vptr be of type vtbl_ptr_type_node.
	Simplify code to grow vtable.
	* decl.c (vtbl_ptr_type_node): Define.
	(init_decl_processing): Initialize it.

From-SVN: r22879

gcc/cp/ChangeLog

+1998-10-07  Mark Mitchell  <mark@markmitchell.com>
+
+	* cp-tree.h (vtbl_ptr_type_node): New variable.
+	* class.c (build_vtbl_ref): Don't indirect through the vptr; it's
+	already of the right type.
+	(finish_struct_1): Make the vptr be of type vtbl_ptr_type_node.
+	Simplify code to grow vtable.
+	* decl.c (vtbl_ptr_type_node): Define.
+	(init_decl_processing): Initialize it.
+	
 1998-10-06  Mark Mitchell  <mark@markmitchell.com>
 
 	* cp-tree.def (PTRMEM_CST): New tree node.

gcc/cp/class.c

@@ -501,8 +501,7 @@ build_vtbl_ref (instance, idx)
     basetype = TREE_TYPE (basetype);
 
   if (instance == current_class_ref)
-    vtbl = build_indirect_ref (build_vfield_ref (instance, basetype),
-			       NULL_PTR);
+    vtbl = build_vfield_ref (instance, basetype);
   else
     {
       if (optimize)
@@ -542,8 +541,7 @@ build_vtbl_ref (instance, idx)
 	      || TREE_CODE (instance) == VAR_DECL))
 	vtbl = TYPE_BINFO_VTABLE (basetype);
       else
-	vtbl = build_indirect_ref (build_vfield_ref (instance, basetype),
-				   NULL_PTR);
+	vtbl = build_vfield_ref (instance, basetype);
     }
 
   assemble_external (vtbl);
@@ -3782,7 +3780,7 @@ finish_struct_1 (t, warn_anon)
       /* We build this decl with ptr_type_node, and
 	 change the type when we know what it should be.  */
       vfield = build_lang_field_decl (FIELD_DECL, get_vfield_name (t),
-				      ptr_type_node);
+				      vtbl_ptr_type_node);
       /* If you change any of the below, take a look at all the
 	 other VFIELD_BASEs and VTABLE_BASEs in the code, and change
 	 them too.  */
@@ -4090,38 +4088,15 @@ finish_struct_1 (t, warn_anon)
   /* Now lay out the virtual function table.  */
   if (has_virtual)
     {
-      tree atype, itype;
+      /* Use size_int so values are memoized in common cases.  */
+      tree itype = build_index_type (size_int (has_virtual));
+      tree atype = build_array_type (vtable_entry_type, itype);
 
-      if (TREE_TYPE (vfield) == ptr_type_node)
-	{
-	  /* We must create a pointer to this table because
-	     the one inherited from base class does not exist.
-	     We will fill in the type when we know what it
-	     should really be.  Use `size_int' so values are memoized
-	     in common cases.  */
-	  itype = build_index_type (size_int (has_virtual));
-	  atype = build_array_type (vtable_entry_type, itype);
-	  layout_type (atype);
-	  TREE_TYPE (vfield) = build_pointer_type (atype);
-	}
-      else
-	{
-	  atype = TREE_TYPE (TREE_TYPE (vfield));
-
-	  if (has_virtual != TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (atype))))
-	    {
-	      /* We must extend (or create) the boundaries on this array,
-		 because we picked up virtual functions from multiple
-		 base classes.  */
-	      itype = build_index_type (size_int (has_virtual));
-	      atype = build_array_type (vtable_entry_type, itype);
-	      layout_type (atype);
-	      vfield = copy_node (vfield);
-	      TREE_TYPE (vfield) = build_pointer_type (atype);
-	    }
-	}
+      layout_type (atype);
 
       CLASSTYPE_VFIELD (t) = vfield;
+
+      /* We may have to grow the vtable.  */
       if (TREE_TYPE (TYPE_BINFO_VTABLE (t)) != atype)
 	{
 	  TREE_TYPE (TYPE_BINFO_VTABLE (t)) = atype;

gcc/cp/cp-tree.h

@@ -1931,8 +1931,10 @@ extern tree opaque_type_node, signature_type_node;
 #define vfunc_ptr_type_node \
   (flag_vtable_thunks ? vtable_entry_type : ptr_type_node)
 
-/* Array type `(void *)[]' */
+/* The type of a vtbl, i.e., an array of vtable entries.  */
 extern tree vtbl_type_node;
+/* The type of a class vtbl pointer, i.e., a pointer to a vtable entry.  */
+extern tree vtbl_ptr_type_node;
 extern tree delta_type_node;
 extern tree std_node;
 

gcc/cp/decl.c

@@ -329,6 +329,7 @@ tree sigtable_entry_type;
 
 /* Array type `vtable_entry_type[]' */
 tree vtbl_type_node;
+tree vtbl_ptr_type_node;
 
 /* namespace std */
 tree std_node;
@@ -6148,6 +6149,9 @@ init_decl_processing ()
   layout_type (vtbl_type_node);
   vtbl_type_node = cp_build_type_variant (vtbl_type_node, 1, 0);
   record_builtin_type (RID_MAX, NULL_PTR, vtbl_type_node);
+  vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
+  layout_type (vtbl_ptr_type_node);
+  record_builtin_type (RID_MAX, NULL_PTR, vtbl_ptr_type_node);
 
   /* Simplify life by making a "sigtable_entry_type".  Give its
      fields names so that the debugger can use them.  */