1 /* 2 * Copyright (c) 2014, 2016, 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 package org.graalvm.compiler.hotspot.word; 24 25 import static org.graalvm.compiler.hotspot.word.HotSpotOperation.HotspotOpcode.POINTER_EQ; 26 import static org.graalvm.compiler.hotspot.word.HotSpotOperation.HotspotOpcode.POINTER_NE; 27 import static org.graalvm.compiler.hotspot.word.HotSpotOperation.HotspotOpcode.READ_KLASS_POINTER; 28 import static org.graalvm.compiler.hotspot.word.HotSpotOperation.HotspotOpcode.TO_KLASS_POINTER; 29 30 import org.graalvm.compiler.core.common.LocationIdentity; 31 import org.graalvm.compiler.word.Pointer; 32 import org.graalvm.compiler.word.Word.Opcode; 33 import org.graalvm.compiler.word.Word.Operation; 34 35 /** 36 * Marker type for a metaspace pointer to a type. 37 */ 38 public abstract class KlassPointer extends MetaspacePointer { 39 40 @HotSpotOperation(opcode = POINTER_EQ) 41 public abstract boolean equal(KlassPointer other); 42 43 @HotSpotOperation(opcode = POINTER_NE) 44 public abstract boolean notEqual(KlassPointer other); 45 46 @HotSpotOperation(opcode = TO_KLASS_POINTER) 47 public static native KlassPointer fromWord(Pointer pointer); 48 49 @HotSpotOperation(opcode = READ_KLASS_POINTER) 50 public native KlassPointer readKlassPointer(int offset, LocationIdentity locationIdentity); 51 52 @Operation(opcode = Opcode.WRITE_POINTER) 53 public native void writeKlassPointer(int offset, KlassPointer t, LocationIdentity locationIdentity); 54 }