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 */ 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 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 }