001/*
002 * Copyright (c) 2015, 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.replacements;
024
025import static com.oracle.graal.hotspot.replacements.HotSpotReplacementsUtil.*;
026
027import com.oracle.graal.api.replacements.*;
028import com.oracle.graal.hotspot.word.*;
029import com.oracle.graal.word.*;
030
031import sun.reflect.*;
032
033/**
034 * Substitutions for {@link sun.reflect.ConstantPool} methods.
035 */
036@ClassSubstitution(sun.reflect.ConstantPool.class)
037public class ConstantPoolSubstitutions {
038
039    /**
040     * Get the metaspace {@code ConstantPool} pointer for the given holder class.
041     *
042     * @param constantPoolOop the holder class as {@link Object}
043     * @return a metaspace {@code ConstantPool} pointer
044     */
045    private static Word metaspaceConstantPool(Object constantPoolOop) {
046        // ConstantPool.constantPoolOop is in fact the holder class.
047        Class<?> constantPoolHolder = (Class<?>) constantPoolOop;
048        KlassPointer klass = ClassGetHubNode.readClass(constantPoolHolder);
049        return klass.readWord(instanceKlassConstantsOffset(), INSTANCE_KLASS_CONSTANTS);
050    }
051
052    @MethodSubstitution(isStatic = false)
053    private static int getSize0(@SuppressWarnings("unused") final ConstantPool thisObj, Object constantPoolOop) {
054        return metaspaceConstantPool(constantPoolOop).readInt(constantPoolLengthOffset());
055    }
056
057    @MethodSubstitution(isStatic = false)
058    private static int getIntAt0(@SuppressWarnings("unused") final ConstantPool thisObj, Object constantPoolOop, int index) {
059        return metaspaceConstantPool(constantPoolOop).readInt(constantPoolSize() + index * wordSize());
060    }
061
062    @MethodSubstitution(isStatic = false)
063    private static long getLongAt0(@SuppressWarnings("unused") final ConstantPool thisObj, Object constantPoolOop, int index) {
064        return metaspaceConstantPool(constantPoolOop).readLong(constantPoolSize() + index * wordSize());
065    }
066
067    @MethodSubstitution(isStatic = false)
068    private static float getFloatAt0(@SuppressWarnings("unused") final ConstantPool thisObj, Object constantPoolOop, int index) {
069        return metaspaceConstantPool(constantPoolOop).readFloat(constantPoolSize() + index * wordSize());
070    }
071
072    @MethodSubstitution(isStatic = false)
073    private static double getDoubleAt0(@SuppressWarnings("unused") final ConstantPool thisObj, Object constantPoolOop, int index) {
074        return metaspaceConstantPool(constantPoolOop).readDouble(constantPoolSize() + index * wordSize());
075    }
076
077}