001/*
002 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.hotspot.word;
024
025import jdk.internal.jvmci.meta.*;
026import static com.oracle.graal.hotspot.word.HotSpotOperation.HotspotOpcode.*;
027
028import com.oracle.graal.word.*;
029import com.oracle.graal.word.Word.Opcode;
030import com.oracle.graal.word.Word.Operation;
031
032/**
033 * Marker type for a metaspace pointer to a type.
034 */
035public abstract class KlassPointer extends MetaspacePointer {
036
037    @HotSpotOperation(opcode = POINTER_EQ)
038    public abstract boolean equal(KlassPointer other);
039
040    @HotSpotOperation(opcode = POINTER_NE)
041    public abstract boolean notEqual(KlassPointer other);
042
043    @HotSpotOperation(opcode = TO_KLASS_POINTER)
044    public static native KlassPointer fromWord(Pointer pointer);
045
046    @HotSpotOperation(opcode = READ_KLASS_POINTER)
047    public native KlassPointer readKlassPointer(int offset, LocationIdentity locationIdentity);
048
049    @Operation(opcode = Opcode.WRITE_POINTER)
050    public native void writeKlassPointer(int offset, KlassPointer t, LocationIdentity locationIdentity);
051}