1 /*
   2  * Copyright (c) 2011, 2016, 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.nodes.extended;
  24 
  25 import static org.graalvm.compiler.nodeinfo.InputType.Memory;
  26 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_20;
  27 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;
  28 
  29 import org.graalvm.compiler.core.common.LocationIdentity;
  30 import org.graalvm.compiler.core.common.type.StampFactory;
  31 import org.graalvm.compiler.graph.NodeClass;
  32 import org.graalvm.compiler.nodeinfo.NodeInfo;
  33 import org.graalvm.compiler.nodes.FixedWithNextNode;
  34 import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
  35 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  36 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  37 
  38 /**
  39  * Creates a memory barrier.
  40  */
  41 @NodeInfo(nameTemplate = "Membar#{p#location/s}", allowedUsageTypes = Memory, cycles = CYCLES_20, size = SIZE_2)
  42 public final class MembarNode extends FixedWithNextNode implements LIRLowerable, MemoryCheckpoint.Single {
  43 
  44     public static final NodeClass<MembarNode> TYPE = NodeClass.create(MembarNode.class);
  45     protected final int barriers;
  46     protected final LocationIdentity location;
  47 
  48     public MembarNode(int barriers) {
  49         this(barriers, LocationIdentity.any());
  50     }
  51 
  52     public MembarNode(int barriers, LocationIdentity location) {
  53         super(TYPE, StampFactory.forVoid());
  54         this.barriers = barriers;
  55         this.location = location;
  56     }
  57 
  58     @Override
  59     public LocationIdentity getLocationIdentity() {
  60         return location;
  61     }
  62 
  63     @Override
  64     public void generate(NodeLIRBuilderTool generator) {
  65         generator.getLIRGeneratorTool().emitMembar(barriers);
  66     }
  67 
  68     @NodeIntrinsic
  69     public static native void memoryBarrier(@ConstantNodeParameter int barriers);
  70 
  71     @NodeIntrinsic
  72     public static native void memoryBarrier(@ConstantNodeParameter int barriers, @ConstantNodeParameter LocationIdentity location);
  73 }