/*

 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package org.graalvm.compiler.hotspot.nodes;

import static org.graalvm.compiler.core.common.NumUtil.roundUp;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;

import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;

import java.util.BitSet;

import org.graalvm.compiler.core.common.type.StampFactory;

import org.graalvm.compiler.graph.NodeClass;

import org.graalvm.compiler.lir.VirtualStackSlot;

import org.graalvm.compiler.lir.gen.LIRGeneratorTool;

import org.graalvm.compiler.nodeinfo.NodeInfo;

import org.graalvm.compiler.nodes.FixedWithNextNode;

import org.graalvm.compiler.nodes.spi.LIRLowerable;

import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;

import org.graalvm.compiler.word.Word;

import org.graalvm.compiler.word.WordTypes;

import jdk.vm.ci.meta.Value;

/**

 * Intrinsic for allocating an on-stack array of integers to hold the dimensions of a multianewarray

 * instruction.

 */

@NodeInfo(cycles = CYCLES_2, size = SIZE_1)

public final class DimensionsNode extends FixedWithNextNode implements LIRLowerable {

    public static final NodeClass<DimensionsNode> TYPE = NodeClass.create(DimensionsNode.class);

    protected final int rank;

    public DimensionsNode(@InjectedNodeParameter WordTypes wordTypes, int rank) {

        super(TYPE, StampFactory.forKind(wordTypes.getWordKind()));

        this.rank = rank;

    }

    @Override

    public void generate(NodeLIRBuilderTool gen) {

        LIRGeneratorTool lirGen = gen.getLIRGeneratorTool();

        int size = rank * 4;

        int wordSize = lirGen.target().wordSize;

        int slots = roundUp(size, wordSize) / wordSize;

        VirtualStackSlot array = lirGen.getResult().getFrameMapBuilder().allocateStackSlots(slots, new BitSet(0), null);

        Value result = lirGen.emitAddress(array);

        gen.setResult(this, result);

    }

    @NodeIntrinsic

    public static native Word allocaDimsArray(@ConstantNodeParameter int rank);

}