001/*
002 * Copyright (c) 2009, 2011, 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.java;
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.*;
030import com.oracle.graal.nodes.spi.*;
031
032/**
033 * The {@code AbstractNewArrayNode} is used for all 1-dimensional array allocations.
034 */
035@NodeInfo
036public abstract class AbstractNewArrayNode extends AbstractNewObjectNode implements ArrayLengthProvider {
037
038    public static final NodeClass<AbstractNewArrayNode> TYPE = NodeClass.create(AbstractNewArrayNode.class);
039    @Input protected ValueNode length;
040
041    @Override
042    public ValueNode length() {
043        return length;
044    }
045
046    protected AbstractNewArrayNode(NodeClass<? extends AbstractNewArrayNode> c, Stamp stamp, ValueNode length, boolean fillContents, FrameState stateBefore) {
047        super(c, stamp, fillContents, stateBefore);
048        this.length = length;
049    }
050
051    /**
052     * The list of node which produce input for this instruction.
053     */
054    public ValueNode dimension(int index) {
055        assert index == 0;
056        return length();
057    }
058
059    /**
060     * The rank of the array allocated by this node, i.e. how many array dimensions.
061     */
062    public int dimensionCount() {
063        return 1;
064    }
065
066    @Override
067    public void simplify(SimplifierTool tool) {
068        Stamp lengthStamp = length.stamp();
069        if (lengthStamp instanceof IntegerStamp && ((IntegerStamp) lengthStamp).isPositive()) {
070            // otherwise, removing the allocation might swallow a NegativeArraySizeException
071            super.simplify(tool);
072        }
073    }
074}