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 }