--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/GraalCompiler/src/com/sun/c1x/ir/MemoryBarrier.java	Wed Apr 27 11:50:44 2011 +0200
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2010, 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.sun.c1x.ir;
+
+import com.sun.c1x.debug.*;
+import com.sun.cri.bytecode.*;
+import com.sun.cri.bytecode.Bytecodes.*;
+import com.sun.cri.ci.*;
+
+/**
+ * Instruction implementing the semantics of {@link Bytecodes#MEMBAR}.
+ *
+ * @author Doug Simon
+ */
+public final class MemoryBarrier extends Instruction {
+
+    /**
+     * A mask of the constants defined by {@link Bytecodes.MemoryBarriers}.
+     */
+    public final int barriers;
+
+    /**
+     * Creates a {@link MemoryBarrier} instance.
+     */
+    public MemoryBarrier(int barriers) {
+        super(CiKind.Void);
+        assert barriers != 0;
+        this.barriers = barriers;
+        setFlag(Flag.LiveSideEffect);
+    }
+
+    @Override
+    public void accept(ValueVisitor v) {
+        v.visitMemoryBarrier(this);
+    }
+
+    @Override
+    public void print(LogStream out) {
+        out.print(MemoryBarriers.barriersString(barriers));
+    }
+}