1 /* 2 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.nodes; 26 27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0; 28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0; 29 30 import jdk.vm.ci.meta.ConstantReflectionProvider; 31 import org.graalvm.compiler.core.common.type.Stamp; 32 import org.graalvm.compiler.graph.Node; 33 import org.graalvm.compiler.graph.NodeClass; 34 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 35 import org.graalvm.compiler.nodeinfo.NodeInfo; 36 import org.graalvm.compiler.nodes.java.ArrayLengthNode; 37 import org.graalvm.compiler.nodes.spi.ArrayLengthProvider; 38 import org.graalvm.compiler.nodes.util.GraphUtil; 39 40 /** 41 * A {@link PiNode} that also provides an array length in addition to a more refined stamp. A usage 42 * that reads the array length, such as an {@link ArrayLengthNode}, can be canonicalized based on 43 * this information. 44 */ 45 @NodeInfo 46 public final class PiArrayNode extends PiNode implements ArrayLengthProvider { 47 48 public static final NodeClass<PiArrayNode> TYPE = NodeClass.create(PiArrayNode.class); 49 @Input ValueNode length; 50 51 @Override findLength(FindLengthMode mode, ConstantReflectionProvider constantReflection)52 public ValueNode findLength(FindLengthMode mode, ConstantReflectionProvider constantReflection) { 53 return length; 54 } 55 PiArrayNode(ValueNode object, ValueNode length, Stamp stamp)56 public PiArrayNode(ValueNode object, ValueNode length, Stamp stamp) { 57 super(TYPE, object, stamp, null); 58 this.length = length; 59 } 60 61 @Override canonical(CanonicalizerTool tool)62 public Node canonical(CanonicalizerTool tool) { 63 if (GraphUtil.arrayLength(object(), ArrayLengthProvider.FindLengthMode.SEARCH_ONLY, tool.getConstantReflection()) != length) { 64 return this; 65 } 66 return super.canonical(tool); 67 } 68 69 /** 70 * Changes the stamp of an object inside a snippet to be the stamp of the node replaced by the 71 * snippet. 72 */ 73 @NodeIntrinsic(Placeholder.class) piArrayCastToSnippetReplaceeStamp(Object object, int length)74 public static native Object piArrayCastToSnippetReplaceeStamp(Object object, int length); 75 76 /** 77 * A placeholder node in a snippet that will be replaced with a {@link PiArrayNode} when the 78 * snippet is instantiated. 79 */ 80 @NodeInfo(cycles = CYCLES_0, size = SIZE_0) 81 public static class Placeholder extends PiNode.Placeholder { 82 83 public static final NodeClass<Placeholder> TYPE = NodeClass.create(Placeholder.class); 84 @Input ValueNode length; 85 Placeholder(ValueNode object, ValueNode length)86 protected Placeholder(ValueNode object, ValueNode length) { 87 super(TYPE, object); 88 this.length = length; 89 } 90 91 @Override makeReplacement(Stamp snippetReplaceeStamp)92 public void makeReplacement(Stamp snippetReplaceeStamp) { 93 PiArrayNode piArray = graph().addOrUnique(new PiArrayNode(object(), length, snippetReplaceeStamp)); 94 replaceAndDelete(piArray); 95 } 96 } 97 } 98