Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/DirectCompareAndSwapNode.java @ 21783:a858c5f56d8a
Introduce AddressNode to represent pointer arithmetic, remove LocationNode.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Mon, 08 Jun 2015 18:47:58 +0200 |
parents | 48c1ebd24120 |
children |
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/* * Copyright (c) 2012, 2015, 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 com.oracle.graal.hotspot.nodes; import com.oracle.jvmci.meta.LocationIdentity; import com.oracle.graal.graph.*; import com.oracle.graal.hotspot.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.java.*; import com.oracle.graal.nodes.memory.*; import com.oracle.graal.nodes.memory.address.*; import com.oracle.graal.nodes.memory.address.AddressNode.Address; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.word.*; /** * A special purpose store node that differs from {@link CompareAndSwapNode} in that it is not a * {@link StateSplit} and it {@linkplain #compareAndSwap(Address, Word, Word, LocationIdentity)} * returns either the expected value or the compared against value instead of a boolean. */ @NodeInfo(allowedUsageTypes = {InputType.Memory}) public final class DirectCompareAndSwapNode extends FixedWithNextNode implements LIRLowerable, MemoryCheckpoint.Single { public static final NodeClass<DirectCompareAndSwapNode> TYPE = NodeClass.create(DirectCompareAndSwapNode.class); @Input(InputType.Association) AddressNode address; @Input ValueNode expectedValue; @Input ValueNode newValue; protected final LocationIdentity locationIdentity; public DirectCompareAndSwapNode(ValueNode address, ValueNode expected, ValueNode newValue, LocationIdentity locationIdentity) { super(TYPE, expected.stamp()); this.address = (AddressNode) address; this.expectedValue = expected; this.newValue = newValue; this.locationIdentity = locationIdentity; } public AddressNode getAddress() { return address; } public ValueNode expectedValue() { return expectedValue; } public ValueNode newValue() { return newValue; } @Override public LocationIdentity getLocationIdentity() { return locationIdentity; } @Override public void generate(NodeLIRBuilderTool gen) { ((HotSpotNodeLIRBuilder) gen).visitDirectCompareAndSwap(this); } /** * Compares an expected value with the actual value in a location denoted by an address. Iff * they are same, {@code newValue} is placed into the location and the {@code expectedValue} is * returned. Otherwise, the actual value is returned. All of the above is performed in one * atomic hardware transaction. * * @param address the address to be atomically tested and updated * @param expectedValue if this value is currently in the field, perform the swap * @param newValue the new value to put into the field * @return either {@code expectedValue} or the actual value */ @NodeIntrinsic public static native Word compareAndSwap(Address address, Word expectedValue, Word newValue, @ConstantNodeParameter LocationIdentity locationIdentity); }