--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/AllocaNode.java	Sun Jan 12 15:01:24 2014 +0100
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2012, 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.hotspot.nodes;
+
+import java.util.*;
+
+import com.oracle.graal.api.code.*;
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.compiler.gen.*;
+import com.oracle.graal.compiler.target.*;
+import com.oracle.graal.hotspot.*;
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.type.*;
+
+/**
+ * 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.
+ */
+public final class AllocaNode extends FixedWithNextNode implements LIRGenLowerable {
+
+    /**
+     * The number of slots in block.
+     */
+    private 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.
+     */
+    private final BitSet objects;
+
+    public AllocaNode(int slots, BitSet objects) {
+        super(StampFactory.forKind(HotSpotGraalRuntime.getHostWordKind()));
+        this.slots = slots;
+        this.objects = objects;
+    }
+
+    @Override
+    public void generate(LIRGenerator gen) {
+        StackSlot array = gen.frameMap().allocateStackSlots(slots, objects, null);
+        Value result = gen.emitAddress(array);
+        gen.setResult(this, result);
+    }
+}