1 /* 2 * Copyright (c) 2012, 2012, 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 package org.graalvm.compiler.nodes; 24 25 import org.graalvm.compiler.core.common.type.Stamp; 26 import org.graalvm.compiler.graph.Node; 27 import org.graalvm.compiler.graph.NodeClass; 28 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 29 import org.graalvm.compiler.nodeinfo.NodeInfo; 30 import org.graalvm.compiler.nodes.java.ArrayLengthNode; 31 import org.graalvm.compiler.nodes.spi.ArrayLengthProvider; 32 import org.graalvm.compiler.nodes.util.GraphUtil; 33 34 /** 35 * A {@link PiNode} that also provides an array length in addition to a more refined stamp. A usage 36 * that reads the array length, such as an {@link ArrayLengthNode}, can be canonicalized based on 37 * this information. 38 */ 39 @NodeInfo 40 public final class PiArrayNode extends PiNode implements ArrayLengthProvider { 41 42 public static final NodeClass<PiArrayNode> TYPE = NodeClass.create(PiArrayNode.class); 43 @Input ValueNode length; 44 45 @Override 46 public ValueNode length() { 47 return length; 48 } 49 50 public PiArrayNode(ValueNode object, ValueNode length, Stamp stamp) { 51 super(TYPE, object, stamp, null); 52 this.length = length; 53 } 54 55 @Override 56 public Node canonical(CanonicalizerTool tool) { 57 if (GraphUtil.arrayLength(object()) != length()) { 58 return this; 59 } 60 return super.canonical(tool); 61 } 62 63 @NodeIntrinsic 64 public static native Object piArrayCast(Object object, int length, @ConstantNodeParameter Stamp stamp); 65 }