Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/LoweredCompareAndSwapNode.java @ 23394:964f28c04d7b default tip
Don't fill the code cache with nmethods from CTW
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Fri, 05 Feb 2016 22:48:36 -0800 |
parents | 615f3bbbb174 |
children |
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/* * Copyright (c) 2013, 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.nodes.java; import jdk.vm.ci.meta.JavaConstant; import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.LIRKind; import jdk.vm.ci.meta.LocationIdentity; import jdk.vm.ci.meta.Value; import com.oracle.graal.compiler.common.type.StampFactory; import com.oracle.graal.graph.NodeClass; import com.oracle.graal.lir.gen.LIRGeneratorTool; import com.oracle.graal.nodeinfo.InputType; import com.oracle.graal.nodeinfo.NodeInfo; import com.oracle.graal.nodes.FrameState; import com.oracle.graal.nodes.StateSplit; import com.oracle.graal.nodes.ValueNode; import com.oracle.graal.nodes.memory.FixedAccessNode; import com.oracle.graal.nodes.memory.MemoryCheckpoint; import com.oracle.graal.nodes.memory.address.AddressNode; import com.oracle.graal.nodes.spi.LIRLowerable; import com.oracle.graal.nodes.spi.NodeLIRBuilderTool; /** * Represents the lowered version of an atomic compare-and-swap operation{@code CompareAndSwapNode}. */ @NodeInfo(allowedUsageTypes = {InputType.Value, InputType.Memory}) public final class LoweredCompareAndSwapNode extends FixedAccessNode implements StateSplit, LIRLowerable, MemoryCheckpoint.Single { public static final NodeClass<LoweredCompareAndSwapNode> TYPE = NodeClass.create(LoweredCompareAndSwapNode.class); @Input ValueNode expectedValue; @Input ValueNode newValue; @OptionalInput(InputType.State) FrameState stateAfter; public FrameState stateAfter() { return stateAfter; } public void setStateAfter(FrameState x) { assert x == null || x.isAlive() : "frame state must be in a graph"; updateUsages(stateAfter, x); stateAfter = x; } public boolean hasSideEffect() { return true; } public ValueNode getExpectedValue() { return expectedValue; } public ValueNode getNewValue() { return newValue; } public LoweredCompareAndSwapNode(AddressNode address, LocationIdentity location, ValueNode expectedValue, ValueNode newValue, BarrierType barrierType) { super(TYPE, address, location, StampFactory.forKind(JavaKind.Boolean.getStackKind()), barrierType); assert expectedValue.getStackKind() == newValue.getStackKind(); this.expectedValue = expectedValue; this.newValue = newValue; } public boolean canNullCheck() { return false; } @Override public void generate(NodeLIRBuilderTool gen) { assert getNewValue().stamp().isCompatible(getExpectedValue().stamp()); LIRGeneratorTool tool = gen.getLIRGeneratorTool(); LIRKind resultKind = tool.getLIRKind(stamp()); Value trueResult = tool.emitConstant(resultKind, JavaConstant.TRUE); Value falseResult = tool.emitConstant(resultKind, JavaConstant.FALSE); Value result = tool.emitCompareAndSwap(gen.operand(getAddress()), gen.operand(getExpectedValue()), gen.operand(getNewValue()), trueResult, falseResult); gen.setResult(this, result); } }