001/*
002 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.nodes;
024
025import com.oracle.graal.compiler.common.type.*;
026import com.oracle.graal.graph.*;
027import com.oracle.graal.graph.spi.*;
028import com.oracle.graal.nodeinfo.*;
029import com.oracle.graal.nodes.java.*;
030import com.oracle.graal.nodes.spi.*;
031import com.oracle.graal.nodes.util.*;
032
033/**
034 * A {@link PiNode} that also provides an array length in addition to a more refined stamp. A usage
035 * that reads the array length, such as an {@link ArrayLengthNode}, can be canonicalized based on
036 * this information.
037 */
038@NodeInfo
039public final class PiArrayNode extends PiNode implements ArrayLengthProvider {
040
041    public static final NodeClass<PiArrayNode> TYPE = NodeClass.create(PiArrayNode.class);
042    @Input ValueNode length;
043
044    public ValueNode length() {
045        return length;
046    }
047
048    public PiArrayNode(ValueNode object, ValueNode length, Stamp stamp) {
049        super(TYPE, object, stamp);
050        this.length = length;
051    }
052
053    @Override
054    public Node canonical(CanonicalizerTool tool) {
055        if (GraphUtil.arrayLength(object()) != length()) {
056            return this;
057        }
058        return super.canonical(tool);
059    }
060
061    @NodeIntrinsic
062    public static native Object piArrayCast(Object object, int length, @ConstantNodeParameter Stamp stamp);
063}