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diff --git a/Source/JavaScriptCore/runtime/StructureIDBlob.h b/Source/JavaScriptCore/runtime/StructureIDBlob.h
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+++ b/Source/JavaScriptCore/runtime/StructureIDBlob.h
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+/*
+ * Copyright (C) 2014, 2015 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. AND ITS CONTRIBUTORS ``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 ITS 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 StructureIDBlob_h
+#define StructureIDBlob_h
+
+#include "CellState.h"
+#include "IndexingType.h"
+#include "JSTypeInfo.h"
+#include "StructureIDTable.h"
+
+namespace JSC {
+
+class StructureIDBlob {
+    friend class LLIntOffsetsExtractor;
+public:
+    StructureIDBlob()
+    {
+        u.doubleWord = 0xbbadbeef;
+    }
+
+    StructureIDBlob(StructureID structureID, IndexingType indexingType, const TypeInfo& typeInfo)
+    {
+        u.fields.structureID = structureID;
+        u.fields.indexingType = indexingType;
+        u.fields.type = typeInfo.type();
+        u.fields.inlineTypeFlags = typeInfo.inlineTypeFlags();
+        u.fields.defaultCellState = CellState::NewWhite;
+    }
+
+    void operator=(const StructureIDBlob& other) { u.doubleWord = other.u.doubleWord; }
+    
+    StructureID structureID() const { return u.fields.structureID; }
+    IndexingType indexingType() const { return u.fields.indexingType; }
+    void setIndexingType(IndexingType indexingType) { u.fields.indexingType = indexingType; }
+    JSType type() const { return u.fields.type; }
+    TypeInfo::InlineTypeFlags inlineTypeFlags() const { return u.fields.inlineTypeFlags; }
+    
+    TypeInfo typeInfo(TypeInfo::OutOfLineTypeFlags outOfLineTypeFlags) const { return TypeInfo(type(), inlineTypeFlags(), outOfLineTypeFlags); }
+    
+    int32_t blobExcludingStructureID() const { return u.words.word2; }
+    int64_t blob() const { return u.doubleWord; }
+    
+    static ptrdiff_t structureIDOffset()
+    {
+        return OBJECT_OFFSETOF(StructureIDBlob, u.fields.structureID);
+    }
+
+    static ptrdiff_t indexingTypeOffset()
+    {
+        return OBJECT_OFFSETOF(StructureIDBlob, u.fields.indexingType);
+    }
+
+private:
+    union {
+        struct {
+            StructureID structureID;
+            IndexingType indexingType;
+            JSType type;
+            TypeInfo::InlineTypeFlags inlineTypeFlags;
+            CellState defaultCellState;
+        } fields;
+        struct {
+            int32_t word1;
+            int32_t word2;
+        } words;
+        int64_t doubleWord;
+    } u;
+};
+
+} // namespace JSC
+
+#endif // StructureIDBlob_h