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/*
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* Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.nodes.java;
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import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_64;
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import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_64;
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import org.graalvm.compiler.graph.IterableNodeType;
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import org.graalvm.compiler.graph.NodeClass;
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import org.graalvm.compiler.nodeinfo.NodeInfo;
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import org.graalvm.compiler.nodes.ValueNode;
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import org.graalvm.compiler.nodes.extended.MonitorExit;
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import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
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import org.graalvm.compiler.nodes.spi.Lowerable;
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import org.graalvm.compiler.nodes.spi.LoweringTool;
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import org.graalvm.compiler.nodes.spi.Virtualizable;
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import org.graalvm.compiler.nodes.spi.VirtualizerTool;
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import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
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import jdk.internal.vm.compiler.word.LocationIdentity;
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/**
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* The {@code MonitorExitNode} represents a monitor release. If it is the release of the monitor of
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* a synchronized method, then the return value of the method will be referenced via the edge
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* {@link #escapedReturnValue}, so that it will be materialized before releasing the monitor.
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*/
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@NodeInfo(cycles = CYCLES_64, size = SIZE_64)
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public final class MonitorExitNode extends AccessMonitorNode implements Virtualizable, Lowerable, IterableNodeType, MonitorExit, MemoryCheckpoint.Single {
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public static final NodeClass<MonitorExitNode> TYPE = NodeClass.create(MonitorExitNode.class);
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/**
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* Non-null for the monitor exit introduced due to a synchronized root method and null in all
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* other cases.
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*/
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@OptionalInput ValueNode escapedReturnValue;
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public MonitorExitNode(ValueNode object, MonitorIdNode monitorId, ValueNode escapedValue) {
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super(TYPE, object, monitorId);
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this.escapedReturnValue = escapedValue;
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}
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/**
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* Return value is cleared when a synchronized method graph is inlined.
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*/
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public void clearEscapedValue() {
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updateUsages(escapedReturnValue, null);
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this.escapedReturnValue = null;
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}
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@Override
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public LocationIdentity getLocationIdentity() {
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return LocationIdentity.any();
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}
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@Override
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public void lower(LoweringTool tool) {
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tool.getLowerer().lower(this, tool);
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}
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@Override
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public void virtualize(VirtualizerTool tool) {
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ValueNode alias = tool.getAlias(object());
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if (alias instanceof VirtualObjectNode) {
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VirtualObjectNode virtual = (VirtualObjectNode) alias;
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if (virtual.hasIdentity()) {
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MonitorIdNode removedLock = tool.removeLock(virtual);
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assert removedLock == getMonitorId() : "mismatch at " + this + ": " + removedLock + " vs. " + getMonitorId();
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tool.delete();
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}
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}
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}
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}
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