--- /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/AllocaNode.java	2016-12-07 13:50:17.343549597 -0800
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2012, 2015, 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.NodeCycles.CYCLES_2;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
+
+import java.util.BitSet;
+
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.lir.VirtualStackSlot;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.FixedWithNextNode;
+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.JavaKind;
+import jdk.vm.ci.meta.Value;
+
+/**
+ * Reserves a block of memory in the stack frame of a method. The block is reserved in the frame for
+ * the entire execution of the associated method.
+ */
+@NodeInfo(cycles = CYCLES_2, size = SIZE_1)
+public final class AllocaNode extends FixedWithNextNode implements LIRLowerable {
+
+    public static final NodeClass<AllocaNode> TYPE = NodeClass.create(AllocaNode.class);
+    /**
+     * The number of slots in block.
+     */
+    protected final int slots;
+
+    /**
+     * The indexes of the object pointer slots in the block. Each such object pointer slot must be
+     * initialized before any safepoint in the method otherwise the garbage collector will see
+     * garbage values when processing these slots.
+     */
+    protected final BitSet objects;
+
+    public AllocaNode(@InjectedNodeParameter WordTypes wordTypes, int slots) {
+        this(slots, wordTypes.getWordKind(), new BitSet());
+    }
+
+    public AllocaNode(int slots, JavaKind wordKind, BitSet objects) {
+        super(TYPE, StampFactory.forKind(wordKind));
+        this.slots = slots;
+        this.objects = objects;
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool gen) {
+        VirtualStackSlot array = gen.getLIRGeneratorTool().getResult().getFrameMapBuilder().allocateStackSlots(slots, objects, null);
+        Value result = gen.getLIRGeneratorTool().emitAddress(array);
+        gen.setResult(this, result);
+    }
+
+    @NodeIntrinsic
+    public static native Word alloca(@ConstantNodeParameter int slots);
+}