Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/LoadIndexedNode.java @ 23354:f6b021195f08
Bugfix: only array types have a component type
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Tue, 26 Jan 2016 15:31:38 -0800 |
parents | 615f3bbbb174 |
children |
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/* * Copyright (c) 2009, 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.ConstantReflectionProvider; import jdk.vm.ci.meta.JavaConstant; import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.MetaAccessProvider; import jdk.vm.ci.meta.ResolvedJavaType; import com.oracle.graal.compiler.common.type.Stamp; import com.oracle.graal.compiler.common.type.StampFactory; import com.oracle.graal.graph.Node; import com.oracle.graal.graph.NodeClass; import com.oracle.graal.graph.spi.Canonicalizable; import com.oracle.graal.graph.spi.CanonicalizerTool; import com.oracle.graal.nodeinfo.NodeInfo; import com.oracle.graal.nodes.ConstantNode; import com.oracle.graal.nodes.ValueNode; import com.oracle.graal.nodes.spi.Virtualizable; import com.oracle.graal.nodes.spi.VirtualizerTool; import com.oracle.graal.nodes.type.StampTool; import com.oracle.graal.nodes.virtual.VirtualArrayNode; import com.oracle.graal.nodes.virtual.VirtualObjectNode; /** * The {@code LoadIndexedNode} represents a read from an element of an array. */ @NodeInfo public class LoadIndexedNode extends AccessIndexedNode implements Virtualizable, Canonicalizable { public static final NodeClass<LoadIndexedNode> TYPE = NodeClass.create(LoadIndexedNode.class); /** * Creates a new LoadIndexedNode. * * @param array the instruction producing the array * @param index the instruction producing the index * @param elementKind the element type */ public LoadIndexedNode(ValueNode array, ValueNode index, JavaKind elementKind) { this(TYPE, createStamp(array, elementKind), array, index, elementKind); } public static ValueNode create(ValueNode array, ValueNode index, JavaKind elementKind, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection) { ValueNode constant = tryConstantFold(array, index, metaAccess, constantReflection); if (constant != null) { return constant; } return new LoadIndexedNode(array, index, elementKind); } protected LoadIndexedNode(NodeClass<? extends LoadIndexedNode> c, Stamp stamp, ValueNode array, ValueNode index, JavaKind elementKind) { super(c, stamp, array, index, elementKind); } private static Stamp createStamp(ValueNode array, JavaKind kind) { ResolvedJavaType type = StampTool.typeOrNull(array); if (kind == JavaKind.Object && type != null && type.isArray()) { return StampFactory.declaredTrusted(type.getComponentType()); } else { return StampFactory.forKind(kind); } } @Override public boolean inferStamp() { return updateStamp(createStamp(array(), elementKind())); } @Override public void virtualize(VirtualizerTool tool) { ValueNode alias = tool.getAlias(array()); if (alias instanceof VirtualObjectNode) { VirtualArrayNode virtual = (VirtualArrayNode) alias; ValueNode indexValue = tool.getAlias(index()); int idx = indexValue.isConstant() ? indexValue.asJavaConstant().asInt() : -1; if (idx >= 0 && idx < virtual.entryCount()) { tool.replaceWith(tool.getEntry(virtual, idx)); } } } public Node canonical(CanonicalizerTool tool) { ValueNode constant = tryConstantFold(array(), index(), tool.getMetaAccess(), tool.getConstantReflection()); if (constant != null) { return constant; } return this; } private static ValueNode tryConstantFold(ValueNode array, ValueNode index, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection) { if (array.isConstant() && !array.isNullConstant() && index.isConstant()) { JavaConstant arrayConstant = array.asJavaConstant(); if (arrayConstant != null) { JavaConstant constant = constantReflection.readConstantArrayElement(arrayConstant, index.asJavaConstant().asInt()); if (constant != null) { return ConstantNode.forConstant(constant, metaAccess); } } } return null; } }