1 /*
   2  * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
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  41 package jdk.internal.vm.compiler.word;
  42 
  43 /**
  44  * Marker interface for all {@link WordBase word types} that have the semantic of a pointer (but not
  45  * necessarily all the memory access methods defined in {@link Pointer}).
  46  *
  47  * @since 1.0
  48  */
  49 public interface PointerBase extends ComparableWord {
  50 
  51     /**
  52      * Returns true if this pointer is the {@link WordFactory#nullPointer null pointer}.
  53      *
  54      * @since 1.0
  55      */
  56     boolean isNull();
  57 
  58     /**
  59      * Returns true if this pointer is not the {@link WordFactory#nullPointer null pointer}.
  60      *
  61      * @since 1.0
  62      */
  63     boolean isNonNull();
  64 }