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diff --git a/js/src/nanojit/Containers.cpp b/js/src/nanojit/Containers.cpp
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+++ b/js/src/nanojit/Containers.cpp
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+/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 4 -*- */
+/* vi: set ts=4 sw=4 expandtab: (add to ~/.vimrc: set modeline modelines=5) */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is [Open Source Virtual Machine].
+ *
+ * The Initial Developer of the Original Code is
+ * Adobe System Incorporated.
+ * Portions created by the Initial Developer are Copyright (C) 2004-2007
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Adobe AS3 Team
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nanojit.h"
+
+#ifdef FEATURE_NANOJIT
+
+namespace nanojit
+{
+    BitSet::BitSet(Allocator& allocator, int nbits)
+        : allocator(allocator)
+        , cap((nbits+63)>>6)
+        , bits((int64_t*)allocator.alloc(cap * sizeof(int64_t)))
+    {
+        reset();
+    }
+
+    void BitSet::reset()
+    {
+        for (int i=0, n=cap; i < n; i++)
+            bits[i] = 0;
+    }
+
+    bool BitSet::setFrom(BitSet& other)
+    {
+        int c = other.cap;
+        if (c > cap)
+            grow(c);
+        int64_t *bits = this->bits;
+        int64_t *otherbits = other.bits;
+        int64_t newbits = 0;
+        for (int i=0; i < c; i++) {
+            int64_t b = bits[i];
+            int64_t b2 = otherbits[i];
+            newbits |= b2 & ~b; // bits in b2 that are not in b
+            bits[i] = b|b2;
+        }
+        return newbits != 0;
+    }
+
+    /** keep doubling the bitset length until w fits */
+    void BitSet::grow(int w)
+    {
+        int cap2 = cap;
+        do {
+            cap2 <<= 1;
+        } while (w > cap2);
+        int64_t *bits2 = (int64_t*) allocator.alloc(cap2 * sizeof(int64_t));
+        int j=0;
+        for (; j < cap; j++)
+            bits2[j] = bits[j];
+        for (; j < cap2; j++)
+            bits2[j] = 0;
+        cap = cap2;
+        bits = bits2;
+    }
+}
+
+#endif // FEATURE_NANOJIT