Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/ArrayLengthNode.java @ 16919:0fe4732e5181
made use of generated Node classes predicated on value of graal.useGeneratedNodes system property (default is false)
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 25 Aug 2014 13:45:12 +0200 |
parents | f90dcdbbb75e |
children | 1d69b5c58bfe |
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/* * Copyright (c) 2009, 2011, 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 com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.util.*; /** * The {@code ArrayLength} instruction gets the length of an array. */ @NodeInfo public class ArrayLengthNode extends FixedWithNextNode implements Canonicalizable.Unary<ValueNode>, Lowerable, Virtualizable { @Input ValueNode array; public ValueNode array() { return array; } public ValueNode getValue() { return array; } public static ArrayLengthNode create(ValueNode array) { return USE_GENERATED_NODES ? new ArrayLengthNodeGen(array) : new ArrayLengthNode(array); } ArrayLengthNode(ValueNode array) { super(StampFactory.positiveInt()); this.array = array; } public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { ValueNode length = readArrayLength(forValue, tool.getConstantReflection()); if (length != null) { return length; } return this; } /** * Gets the length of an array if possible. * * @return a node representing the length of {@code array} or null if it is not available */ public static ValueNode readArrayLength(ValueNode originalArray, ConstantReflectionProvider constantReflection) { ArrayLengthProvider foundArrayLengthProvider = null; ValueNode result = originalArray; while (true) { if (result instanceof ArrayLengthProvider) { foundArrayLengthProvider = (ArrayLengthProvider) result; break; } if (result instanceof ValueProxy) { result = ((ValueProxy) result).getOriginalNode(); } else { break; } } if (foundArrayLengthProvider != null) { ValueNode length = foundArrayLengthProvider.length(); if (length != null) { return length; } } ValueNode array = GraphUtil.unproxify(originalArray); if (constantReflection != null && array.isConstant() && !array.isNullConstant()) { Constant constantValue = array.asConstant(); if (constantValue != null && constantValue.isNonNull()) { Integer constantLength = constantReflection.readArrayLength(constantValue); if (constantLength != null) { return ConstantNode.forInt(constantLength); } } } return null; } @Override public void lower(LoweringTool tool) { tool.getLowerer().lower(this, tool); } @NodeIntrinsic public static native int arrayLength(Object array); @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(array()); if (state != null) { assert state.getVirtualObject().type().isArray(); tool.replaceWithValue(ConstantNode.forInt(state.getVirtualObject().entryCount(), graph())); } } }