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diff --git a/Source/JavaScriptCore/runtime/ExecutableBase.h b/Source/JavaScriptCore/runtime/ExecutableBase.h
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+/*
+ * Copyright (C) 2009, 2010, 2013-2016 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 "ArityCheckMode.h"
+#include "CallData.h"
+#include "CodeBlockHash.h"
+#include "CodeSpecializationKind.h"
+#include "CompilationResult.h"
+#include "ExecutableInfo.h"
+#include "HandlerInfo.h"
+#include "InferredValue.h"
+#include "JITCode.h"
+#include "JSGlobalObject.h"
+#include "SourceCode.h"
+#include "TypeSet.h"
+#include "UnlinkedCodeBlock.h"
+#include "UnlinkedFunctionExecutable.h"
+
+namespace JSC {
+
+class CodeBlock;
+class EvalCodeBlock;
+class FunctionCodeBlock;
+class JSScope;
+class JSWebAssemblyModule;
+class LLIntOffsetsExtractor;
+class ModuleProgramCodeBlock;
+class ProgramCodeBlock;
+
+enum CompilationKind { FirstCompilation, OptimizingCompilation };
+
+inline bool isCall(CodeSpecializationKind kind)
+{
+    if (kind == CodeForCall)
+        return true;
+    ASSERT(kind == CodeForConstruct);
+    return false;
+}
+
+class ExecutableBase : public JSCell {
+    friend class JIT;
+
+protected:
+    static const int NUM_PARAMETERS_IS_HOST = 0;
+    static const int NUM_PARAMETERS_NOT_COMPILED = -1;
+
+    ExecutableBase(VM& vm, Structure* structure, int numParameters, Intrinsic intrinsic)
+        : JSCell(vm, structure)
+        , m_numParametersForCall(numParameters)
+        , m_numParametersForConstruct(numParameters)
+        , m_intrinsic(intrinsic)
+    {
+    }
+
+    void finishCreation(VM& vm)
+    {
+        Base::finishCreation(vm);
+    }
+
+public:
+    typedef JSCell Base;
+    static const unsigned StructureFlags = Base::StructureFlags;
+
+    static const bool needsDestruction = true;
+    static void destroy(JSCell*);
+        
+    CodeBlockHash hashFor(CodeSpecializationKind) const;
+
+    bool isEvalExecutable() const
+    {
+        return type() == EvalExecutableType;
+    }
+    bool isFunctionExecutable() const
+    {
+        return type() == FunctionExecutableType;
+    }
+    bool isProgramExecutable() const
+    {
+        return type() == ProgramExecutableType;
+    }
+    bool isModuleProgramExecutable()
+    {
+        return type() == ModuleProgramExecutableType;
+    }
+
+
+    bool isHostFunction() const
+    {
+        ASSERT((m_numParametersForCall == NUM_PARAMETERS_IS_HOST) == (m_numParametersForConstruct == NUM_PARAMETERS_IS_HOST));
+        return m_numParametersForCall == NUM_PARAMETERS_IS_HOST;
+    }
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(vm, globalObject, proto, TypeInfo(CellType, StructureFlags), info()); }
+        
+    void clearCode();
+
+    DECLARE_EXPORT_INFO;
+
+protected:
+    int m_numParametersForCall;
+    int m_numParametersForConstruct;
+
+public:
+    Ref<JITCode> generatedJITCodeForCall()
+    {
+        ASSERT(m_jitCodeForCall);
+        return *m_jitCodeForCall;
+    }
+
+    Ref<JITCode> generatedJITCodeForConstruct()
+    {
+        ASSERT(m_jitCodeForConstruct);
+        return *m_jitCodeForConstruct;
+    }
+        
+    Ref<JITCode> generatedJITCodeFor(CodeSpecializationKind kind)
+    {
+        if (kind == CodeForCall)
+            return generatedJITCodeForCall();
+        ASSERT(kind == CodeForConstruct);
+        return generatedJITCodeForConstruct();
+    }
+    
+    MacroAssemblerCodePtr entrypointFor(CodeSpecializationKind kind, ArityCheckMode arity)
+    {
+        // Check if we have a cached result. We only have it for arity check because we use the
+        // no-arity entrypoint in non-virtual calls, which will "cache" this value directly in
+        // machine code.
+        if (arity == MustCheckArity) {
+            switch (kind) {
+            case CodeForCall:
+                if (MacroAssemblerCodePtr result = m_jitCodeForCallWithArityCheck)
+                    return result;
+                break;
+            case CodeForConstruct:
+                if (MacroAssemblerCodePtr result = m_jitCodeForConstructWithArityCheck)
+                    return result;
+                break;
+            }
+        }
+        MacroAssemblerCodePtr result =
+            generatedJITCodeFor(kind)->addressForCall(arity);
+        if (arity == MustCheckArity) {
+            // Cache the result; this is necessary for the JIT's virtual call optimizations.
+            switch (kind) {
+            case CodeForCall:
+                m_jitCodeForCallWithArityCheck = result;
+                break;
+            case CodeForConstruct:
+                m_jitCodeForConstructWithArityCheck = result;
+                break;
+            }
+        }
+        return result;
+    }
+
+    static ptrdiff_t offsetOfJITCodeWithArityCheckFor(
+        CodeSpecializationKind kind)
+    {
+        switch (kind) {
+        case CodeForCall:
+            return OBJECT_OFFSETOF(ExecutableBase, m_jitCodeForCallWithArityCheck);
+        case CodeForConstruct:
+            return OBJECT_OFFSETOF(ExecutableBase, m_jitCodeForConstructWithArityCheck);
+        }
+        RELEASE_ASSERT_NOT_REACHED();
+        return 0;
+    }
+    
+    static ptrdiff_t offsetOfNumParametersFor(CodeSpecializationKind kind)
+    {
+        if (kind == CodeForCall)
+            return OBJECT_OFFSETOF(ExecutableBase, m_numParametersForCall);
+        ASSERT(kind == CodeForConstruct);
+        return OBJECT_OFFSETOF(ExecutableBase, m_numParametersForConstruct);
+    }
+
+    bool hasJITCodeForCall() const
+    {
+        return m_numParametersForCall >= 0;
+    }
+        
+    bool hasJITCodeForConstruct() const
+    {
+        return m_numParametersForConstruct >= 0;
+    }
+        
+    bool hasJITCodeFor(CodeSpecializationKind kind) const
+    {
+        if (kind == CodeForCall)
+            return hasJITCodeForCall();
+        ASSERT(kind == CodeForConstruct);
+        return hasJITCodeForConstruct();
+    }
+
+    // Intrinsics are only for calls, currently.
+    Intrinsic intrinsic() const { return m_intrinsic; }
+        
+    Intrinsic intrinsicFor(CodeSpecializationKind kind) const
+    {
+        if (isCall(kind))
+            return intrinsic();
+        return NoIntrinsic;
+    }
+    
+    void dump(PrintStream&) const;
+        
+protected:
+    Intrinsic m_intrinsic;
+    RefPtr<JITCode> m_jitCodeForCall;
+    RefPtr<JITCode> m_jitCodeForConstruct;
+    MacroAssemblerCodePtr m_jitCodeForCallWithArityCheck;
+    MacroAssemblerCodePtr m_jitCodeForConstructWithArityCheck;
+};
+
+} // namespace JSC