--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/nodes/BeginLockScopeNode.java	2016-12-07 13:50:17.873572894 -0800
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2012, 2016, 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 org.graalvm.compiler.hotspot.nodes;
+
+import static org.graalvm.compiler.nodeinfo.InputType.Memory;
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
+
+import org.graalvm.compiler.core.common.LocationIdentity;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.hotspot.HotSpotLIRGenerator;
+import org.graalvm.compiler.lir.VirtualStackSlot;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.extended.MonitorEnter;
+import org.graalvm.compiler.nodes.memory.AbstractMemoryCheckpoint;
+import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
+import org.graalvm.compiler.nodes.spi.LIRLowerable;
+import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+import org.graalvm.compiler.word.Word;
+import org.graalvm.compiler.word.WordTypes;
+
+import jdk.vm.ci.meta.Value;
+
+/**
+ * Intrinsic for opening a scope binding a stack-based lock with an object. A lock scope must be
+ * closed with an {@link EndLockScopeNode}. The frame state after this node denotes that the object
+ * is locked (ensuring the GC sees and updates the object) so it must come after any null pointer
+ * check on the object.
+ */
+@NodeInfo(allowedUsageTypes = Memory, cycles = CYCLES_2, size = SIZE_1)
+public final class BeginLockScopeNode extends AbstractMemoryCheckpoint implements LIRLowerable, MonitorEnter, MemoryCheckpoint.Single {
+
+    public static final NodeClass<BeginLockScopeNode> TYPE = NodeClass.create(BeginLockScopeNode.class);
+    protected int lockDepth;
+
+    public BeginLockScopeNode(@InjectedNodeParameter WordTypes wordTypes, int lockDepth) {
+        super(TYPE, StampFactory.forKind(wordTypes.getWordKind()));
+        this.lockDepth = lockDepth;
+    }
+
+    @Override
+    public boolean hasSideEffect() {
+        return false;
+    }
+
+    @Override
+    public LocationIdentity getLocationIdentity() {
+        return LocationIdentity.any();
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool gen) {
+        assert lockDepth != -1;
+        HotSpotLIRGenerator hsGen = (HotSpotLIRGenerator) gen.getLIRGeneratorTool();
+        VirtualStackSlot slot = hsGen.getLockSlot(lockDepth);
+        Value result = gen.getLIRGeneratorTool().emitAddress(slot);
+        gen.setResult(this, result);
+    }
+
+    @NodeIntrinsic
+    public static native Word beginLockScope(@ConstantNodeParameter int lockDepth);
+}