1 /*
   2  * Copyright (c) 2012, 2015, 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 package org.graalvm.compiler.hotspot.nodes;
  24 
  25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
  27 
  28 import org.graalvm.compiler.core.common.type.StampFactory;
  29 import org.graalvm.compiler.graph.NodeClass;
  30 import org.graalvm.compiler.hotspot.HotSpotLIRGenerator;
  31 import org.graalvm.compiler.lir.VirtualStackSlot;
  32 import org.graalvm.compiler.nodeinfo.NodeInfo;
  33 import org.graalvm.compiler.nodes.FixedWithNextNode;
  34 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  35 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  36 import org.graalvm.compiler.word.Word;
  37 import org.graalvm.compiler.word.WordTypes;
  38 
  39 import jdk.vm.ci.meta.Value;
  40 
  41 /**
  42  * Intrinsic for getting the lock in the current {@linkplain BeginLockScopeNode lock scope}.
  43  */
  44 @NodeInfo(cycles = CYCLES_2, size = SIZE_1)
  45 public final class CurrentLockNode extends FixedWithNextNode implements LIRLowerable {
  46     public static final NodeClass<CurrentLockNode> TYPE = NodeClass.create(CurrentLockNode.class);
  47 
  48     protected int lockDepth;
  49 
  50     public CurrentLockNode(@InjectedNodeParameter WordTypes wordTypes, int lockDepth) {
  51         super(TYPE, StampFactory.forKind(wordTypes.getWordKind()));
  52         this.lockDepth = lockDepth;
  53     }
  54 
  55     @Override
  56     public void generate(NodeLIRBuilderTool gen) {
  57         assert lockDepth != -1;
  58         HotSpotLIRGenerator hsGen = (HotSpotLIRGenerator) gen.getLIRGeneratorTool();
  59         VirtualStackSlot slot = hsGen.getLockSlot(lockDepth);
  60         // The register allocator cannot handle stack -> register moves so we use an LEA here
  61         Value result = gen.getLIRGeneratorTool().emitAddress(slot);
  62         gen.setResult(this, result);
  63     }
  64 
  65     @NodeIntrinsic
  66     public static native Word currentLock(@ConstantNodeParameter int lockDepth);
  67 }