001/*
002 * Copyright (c) 2009, 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.nodes.java;
024
025import jdk.internal.jvmci.code.*;
026
027import com.oracle.graal.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodeinfo.*;
030import com.oracle.graal.nodes.*;
031import com.oracle.graal.nodes.memory.*;
032
033/**
034 * The {@code AccessMonitorNode} is the base class of both monitor acquisition and release.
035 * <p>
036 * The Java bytecode specification allows non-balanced locking. Graal does not handle such cases and
037 * throws a {@link BailoutException} instead during graph building.
038 */
039@NodeInfo(allowedUsageTypes = {InputType.Memory})
040public abstract class AccessMonitorNode extends AbstractMemoryCheckpoint implements MemoryCheckpoint, DeoptimizingNode.DeoptBefore, DeoptimizingNode.DeoptAfter {
041
042    public static final NodeClass<AccessMonitorNode> TYPE = NodeClass.create(AccessMonitorNode.class);
043    @OptionalInput(InputType.State) FrameState stateBefore;
044    @Input ValueNode object;
045    @Input(InputType.Association) MonitorIdNode monitorId;
046
047    @Override
048    public boolean canDeoptimize() {
049        return true;
050    }
051
052    public FrameState stateBefore() {
053        return stateBefore;
054    }
055
056    @Override
057    public void setStateBefore(FrameState f) {
058        updateUsages(stateBefore, f);
059        stateBefore = f;
060    }
061
062    public ValueNode object() {
063        return object;
064    }
065
066    public MonitorIdNode getMonitorId() {
067        return monitorId;
068    }
069
070    /**
071     * Creates a new AccessMonitor instruction.
072     *
073     * @param object the instruction producing the object
074     */
075    protected AccessMonitorNode(NodeClass<? extends AccessMonitorNode> c, ValueNode object, MonitorIdNode monitorId) {
076        super(c, StampFactory.forVoid());
077        this.object = object;
078        this.monitorId = monitorId;
079    }
080}