1 /*
   2  * Copyright (c) 2012, 2018, 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 
  24 
  25 package org.graalvm.compiler.hotspot.nodes;
  26 
  27 import static org.graalvm.compiler.core.common.NumUtil.roundUp;
  28 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
  29 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
  30 
  31 import java.util.BitSet;
  32 
  33 import org.graalvm.compiler.core.common.type.StampFactory;
  34 import org.graalvm.compiler.graph.NodeClass;
  35 import org.graalvm.compiler.lir.VirtualStackSlot;
  36 import org.graalvm.compiler.lir.gen.LIRGeneratorTool;
  37 import org.graalvm.compiler.nodeinfo.NodeInfo;
  38 import org.graalvm.compiler.nodes.FixedWithNextNode;
  39 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  40 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  41 import org.graalvm.compiler.word.Word;
  42 import org.graalvm.compiler.word.WordTypes;
  43 
  44 import jdk.vm.ci.meta.Value;
  45 
  46 /**
  47  * Intrinsic for allocating an on-stack array of integers to hold the dimensions of a multianewarray
  48  * instruction.
  49  */
  50 @NodeInfo(cycles = CYCLES_2, size = SIZE_1)
  51 public final class DimensionsNode extends FixedWithNextNode implements LIRLowerable {
  52 
  53     public static final NodeClass<DimensionsNode> TYPE = NodeClass.create(DimensionsNode.class);
  54     protected final int rank;
  55 
  56     public DimensionsNode(@InjectedNodeParameter WordTypes wordTypes, int rank) {
  57         super(TYPE, StampFactory.forKind(wordTypes.getWordKind()));
  58         this.rank = rank;
  59     }
  60 
  61     @Override
  62     public void generate(NodeLIRBuilderTool gen) {
  63         LIRGeneratorTool lirGen = gen.getLIRGeneratorTool();
  64         int size = rank * 4;
  65         int wordSize = lirGen.target().wordSize;
  66         int slots = roundUp(size, wordSize) / wordSize;
  67         VirtualStackSlot array = lirGen.allocateStackSlots(slots, new BitSet(0), null);
  68         Value result = lirGen.emitAddress(array);
  69         gen.setResult(this, result);
  70     }
  71 
  72     @NodeIntrinsic
  73     public static native Word allocaDimsArray(@ConstantNodeParameter int rank);
  74 }