Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/MembarNode.java @ 10090:ae6f0c381087
split MemoryCheckpoint interface into Single and Multi
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 19 Jun 2013 16:42:56 +0200 |
parents | b4f12c603be5 |
children | ae0001b445c0 |
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/* * Copyright (c) 2011, 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 com.oracle.graal.nodes.extended; import static com.oracle.graal.graph.UnsafeAccess.*; import java.lang.reflect.*; import sun.misc.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * Creates a memory barrier. */ public class MembarNode extends FixedWithNextNode implements LIRLowerable, MemoryCheckpoint.Single { private final int barriers; /** * @param barriers a mask of the barrier constants defined in {@link MemoryBarriers} */ public MembarNode(int barriers) { super(StampFactory.forVoid()); this.barriers = barriers; } @Override public LocationIdentity getLocationIdentity() { return LocationIdentity.ANY_LOCATION; } @Override public void generate(LIRGeneratorTool generator) { generator.emitMembar(barriers); } @SuppressWarnings("unused") @NodeIntrinsic public static void memoryBarrier(@ConstantNodeParameter int barriers) { // Overly conservative but it doesn't matter in the interpreter unsafe.putIntVolatile(dummyBase, dummyOffset, 0); unsafe.getIntVolatile(dummyBase, dummyOffset); } /** * An unused field that it used to exercise barriers in the interpreter. This can be replaced * with direct support for barriers in {@link Unsafe} if/when they become available. */ @SuppressWarnings("unused") private static int dummy; private static Object dummyBase; private static long dummyOffset; static { try { Field dummyField = MembarNode.class.getDeclaredField("dummy"); dummyBase = unsafe.staticFieldBase(dummyField); dummyOffset = unsafe.staticFieldOffset(dummyField); } catch (Exception e) { throw new GraalInternalError(e); } } }