Mercurial > hg > truffle
view graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/nodes/java/ArrayLengthNode.java @ 3530:da773e1b6d9f
Third round of refactoring.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 10 Aug 2011 00:47:53 +0200 |
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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.max.graal.nodes.java; import com.oracle.max.graal.compiler.graph.*; import com.oracle.max.graal.graph.*; import com.oracle.max.graal.nodes.base.*; import com.oracle.max.graal.nodes.calc.*; import com.oracle.max.graal.nodes.spi.*; import com.sun.cri.ci.*; import com.sun.cri.ri.*; /** * The {@code ArrayLength} instruction gets the length of an array. */ public final class ArrayLengthNode extends FloatingNode implements Canonicalizable { @Input private ValueNode array; public ValueNode array() { return array; } public void setArray(ValueNode x) { updateUsages(array, x); array = x; } /** * Constructs a new ArrayLength instruction. * * @param array the instruction producing the array * @param newFrameState the state after executing this instruction */ public ArrayLengthNode(ValueNode array, Graph graph) { super(CiKind.Int, graph); setArray(array); } @Override public void accept(ValueVisitor v) { v.visitArrayLength(this); } @Override public Node canonical(NotifyReProcess reProcess) { if (array() instanceof NewArrayNode) { ValueNode length = ((NewArrayNode) array()).dimension(0); assert length != null; return length; } CiConstant constantValue = null; if (array().isConstant()) { constantValue = array().asConstant(); if (constantValue != null && constantValue.isNonNull()) { if (graph() instanceof CompilerGraph) { RiRuntime runtime = ((CompilerGraph) graph()).runtime(); return ConstantNode.forInt(runtime.getArrayLength(constantValue), graph()); } } } return this; } }