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diff --git a/Source/JavaScriptCore/interpreter/VMEntryRecord.h b/Source/JavaScriptCore/interpreter/VMEntryRecord.h
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+++ b/Source/JavaScriptCore/interpreter/VMEntryRecord.h
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+/*
+ * Copyright (C) 2014, 2016 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.
+ */
+
+#pragma once
+
+#include "GPRInfo.h"
+
+namespace JSC {
+
+struct VMEntryFrame;
+class ExecState;
+class VM;
+
+struct VMEntryRecord {
+    /*
+     * This record stored in a vmEntryTo{JavaScript,Host} allocated frame. It is allocated on the stack
+     * after callee save registers where local variables would go.
+     */
+    VM* m_vm;
+    ExecState* m_prevTopCallFrame;
+    VMEntryFrame* m_prevTopVMEntryFrame;
+
+#if ENABLE(JIT) && NUMBER_OF_CALLEE_SAVES_REGISTERS > 0
+    intptr_t calleeSaveRegistersBuffer[NUMBER_OF_CALLEE_SAVES_REGISTERS];
+#endif
+
+    ExecState* prevTopCallFrame() { return m_prevTopCallFrame; }
+    SUPPRESS_ASAN ExecState* unsafePrevTopCallFrame() { return m_prevTopCallFrame; }
+
+    VMEntryFrame* prevTopVMEntryFrame() { return m_prevTopVMEntryFrame; }
+    SUPPRESS_ASAN VMEntryFrame* unsafePrevTopVMEntryFrame() { return m_prevTopVMEntryFrame; }
+};
+
+extern "C" VMEntryRecord* vmEntryRecord(VMEntryFrame*);
+
+struct VMEntryFrame {
+#if ENABLE(JIT) && NUMBER_OF_CALLEE_SAVES_REGISTERS > 0
+    static ptrdiff_t vmEntryRecordOffset()
+    {
+        VMEntryFrame* fakeVMEntryFrame = reinterpret_cast<VMEntryFrame*>(0x1000);
+        VMEntryRecord* record = vmEntryRecord(fakeVMEntryFrame);
+        return static_cast<ptrdiff_t>(
+            reinterpret_cast<char*>(record) - reinterpret_cast<char*>(fakeVMEntryFrame));
+    }
+
+    static ptrdiff_t calleeSaveRegistersBufferOffset()
+    {
+        return vmEntryRecordOffset() + OBJECT_OFFSETOF(VMEntryRecord, calleeSaveRegistersBuffer);
+    }
+#endif
+};
+
+} // namespace JSC