PiArrayNode.java revision 12651:6ef01bd40ce2 
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 */
23package org.graalvm.compiler.nodes;
24
25import org.graalvm.compiler.core.common.type.Stamp;
26import org.graalvm.compiler.graph.Node;
27import org.graalvm.compiler.graph.NodeClass;
28import org.graalvm.compiler.graph.spi.CanonicalizerTool;
29import org.graalvm.compiler.nodeinfo.NodeInfo;
30import org.graalvm.compiler.nodes.java.ArrayLengthNode;
31import org.graalvm.compiler.nodes.spi.ArrayLengthProvider;
32import 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
40public 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}
66