/*
 * Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */


package org.graalvm.compiler.nodes.java;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_64;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_64;

import org.graalvm.compiler.graph.IterableNodeType;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.extended.MonitorEnter;
import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
import org.graalvm.compiler.nodes.spi.Lowerable;
import org.graalvm.compiler.nodes.spi.LoweringTool;
import org.graalvm.compiler.nodes.spi.Virtualizable;
import org.graalvm.compiler.nodes.spi.VirtualizerTool;
import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
import jdk.internal.vm.compiler.word.LocationIdentity;

/**
 * The {@code MonitorEnterNode} represents the acquisition of a monitor.
 */
@NodeInfo(cycles = CYCLES_64, size = SIZE_64)
public class MonitorEnterNode extends AccessMonitorNode implements Virtualizable, Lowerable, IterableNodeType, MonitorEnter, MemoryCheckpoint.Single {

    public static final NodeClass<MonitorEnterNode> TYPE = NodeClass.create(MonitorEnterNode.class);

    public MonitorEnterNode(ValueNode object, MonitorIdNode monitorId) {
        this(TYPE, object, monitorId);
    }

    public MonitorEnterNode(NodeClass<? extends MonitorEnterNode> c, ValueNode object, MonitorIdNode monitorId) {
        super(c, object, monitorId);
    }

    @Override
    public LocationIdentity getKilledLocationIdentity() {
        return LocationIdentity.any();
    }

    @Override
    public void lower(LoweringTool tool) {
        tool.getLowerer().lower(this, tool);
    }

    @Override
    public void virtualize(VirtualizerTool tool) {
        ValueNode alias = tool.getAlias(object());
        if (alias instanceof VirtualObjectNode) {
            VirtualObjectNode virtual = (VirtualObjectNode) alias;
            if (virtual.hasIdentity()) {
                tool.addLock(virtual, getMonitorId());
                tool.delete();
            }
        }
    }
}