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diff --git a/Source/JavaScriptCore/runtime/IndexingHeaderInlineMethods.h b/Source/JavaScriptCore/runtime/IndexingHeaderInlineMethods.h
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+++ b/Source/JavaScriptCore/runtime/IndexingHeaderInlineMethods.h
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+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef IndexingHeaderInlineMethods_h
+#define IndexingHeaderInlineMethods_h
+
+#include "ArrayStorage.h"
+#include "IndexingHeader.h"
+#include "Structure.h"
+
+namespace JSC {
+
+inline size_t IndexingHeader::preCapacity(Structure* structure)
+{
+    if (LIKELY(!hasArrayStorage(structure->indexingType())))
+        return 0;
+    
+    return arrayStorage()->m_indexBias;
+}
+
+inline size_t IndexingHeader::indexingPayloadSizeInBytes(Structure* structure)
+{
+    switch (structure->indexingType()) {
+    case ALL_CONTIGUOUS_INDEXING_TYPES:
+        return vectorLength() * sizeof(EncodedJSValue);
+        
+    case ALL_ARRAY_STORAGE_INDEXING_TYPES:
+        return ArrayStorage::sizeFor(arrayStorage()->vectorLength());
+        
+    default:
+        ASSERT(!hasIndexedProperties(structure->indexingType()));
+        return 0;
+    }
+}
+
+} // namespace JSC
+
+#endif // IndexingHeaderInlineMethods_h
+