| /* |
| * Copyright (c) 2009, 2016, 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 org.graalvm.compiler.nodes.java; |
| |
| import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_8; |
| import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_8; |
| |
| import org.graalvm.compiler.core.common.type.Stamp; |
| import org.graalvm.compiler.core.common.type.StampFactory; |
| import org.graalvm.compiler.core.common.type.TypeReference; |
| import org.graalvm.compiler.graph.Node; |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.graph.spi.Canonicalizable; |
| import org.graalvm.compiler.graph.spi.CanonicalizerTool; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| import org.graalvm.compiler.nodes.ConstantNode; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.spi.Virtualizable; |
| import org.graalvm.compiler.nodes.spi.VirtualizerTool; |
| import org.graalvm.compiler.nodes.type.StampTool; |
| import org.graalvm.compiler.nodes.virtual.VirtualArrayNode; |
| import org.graalvm.compiler.nodes.virtual.VirtualObjectNode; |
| |
| import jdk.vm.ci.meta.Assumptions; |
| 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; |
| |
| /** |
| * The {@code LoadIndexedNode} represents a read from an element of an array. |
| */ |
| @NodeInfo(cycles = CYCLES_8, size = SIZE_8) |
| 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(Assumptions assumptions, ValueNode array, ValueNode index, JavaKind elementKind) { |
| this(TYPE, createStamp(assumptions, array, elementKind), array, index, elementKind); |
| } |
| |
| public static ValueNode create(Assumptions assumptions, 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(assumptions, 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(Assumptions assumptions, ValueNode array, JavaKind kind) { |
| ResolvedJavaType type = StampTool.typeOrNull(array); |
| if (kind == JavaKind.Object && type != null && type.isArray()) { |
| return StampFactory.object(TypeReference.createTrusted(assumptions, type.getComponentType())); |
| } else { |
| return StampFactory.forKind(kind); |
| } |
| } |
| |
| @Override |
| public boolean inferStamp() { |
| return updateStamp(createStamp(graph().getAssumptions(), 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)); |
| } |
| } |
| } |
| |
| @Override |
| 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) { |
| int stableDimension = ((ConstantNode) array).getStableDimension(); |
| if (stableDimension > 0) { |
| JavaConstant constant = constantReflection.readArrayElement(arrayConstant, index.asJavaConstant().asInt()); |
| boolean isDefaultStable = ((ConstantNode) array).isDefaultStable(); |
| if (constant != null && (isDefaultStable || !constant.isDefaultForKind())) { |
| return ConstantNode.forConstant(constant, stableDimension - 1, isDefaultStable, metaAccess); |
| } |
| } |
| } |
| } |
| return null; |
| } |
| } |