X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/14957cd040308e3eeec43d26bae5d76da13fcd85..93a3786624b2768d89bfa27e46598dc64e2fb70a:/runtime/Executable.cpp?ds=inline

diff --git a/runtime/Executable.cpp b/runtime/Executable.cpp
index 5fa560e..9185376 100644
--- a/runtime/Executable.cpp
+++ b/runtime/Executable.cpp
@@ -26,138 +26,210 @@
 #include "config.h"
 #include "Executable.h"
 
+#include "BatchedTransitionOptimizer.h"
 #include "BytecodeGenerator.h"
 #include "CodeBlock.h"
+#include "DFGDriver.h"
+#include "ExecutionHarness.h"
 #include "JIT.h"
+#include "JITDriver.h"
+#include "Operations.h"
 #include "Parser.h"
-#include "UStringBuilder.h"
-#include "Vector.h"
+#include <wtf/Vector.h>
+#include <wtf/text/StringBuilder.h>
 
-#if ENABLE(DFG_JIT)
-#include "DFGByteCodeParser.h"
-#include "DFGJITCompiler.h"
+namespace JSC {
+
+const ClassInfo ExecutableBase::s_info = { "Executable", 0, 0, 0, CREATE_METHOD_TABLE(ExecutableBase) };
+
+#if ENABLE(JIT)
+void ExecutableBase::destroy(JSCell* cell)
+{
+    static_cast<ExecutableBase*>(cell)->ExecutableBase::~ExecutableBase();
+}
 #endif
 
-namespace JSC {
+void ExecutableBase::clearCode()
+{
+#if ENABLE(JIT)
+    m_jitCodeForCall.clear();
+    m_jitCodeForConstruct.clear();
+    m_jitCodeForCallWithArityCheck = MacroAssemblerCodePtr();
+    m_jitCodeForConstructWithArityCheck = MacroAssemblerCodePtr();
+#endif
+    m_numParametersForCall = NUM_PARAMETERS_NOT_COMPILED;
+    m_numParametersForConstruct = NUM_PARAMETERS_NOT_COMPILED;
+}
+
+#if ENABLE(DFG_JIT)
+Intrinsic ExecutableBase::intrinsic() const
+{
+    if (const NativeExecutable* nativeExecutable = jsDynamicCast<const NativeExecutable*>(this))
+        return nativeExecutable->intrinsic();
+    return NoIntrinsic;
+}
+#else
+Intrinsic ExecutableBase::intrinsic() const
+{
+    return NoIntrinsic;
+}
+#endif
 
-const ClassInfo ExecutableBase::s_info = { "Executable", 0, 0, 0 };
+const ClassInfo NativeExecutable::s_info = { "NativeExecutable", &ExecutableBase::s_info, 0, 0, CREATE_METHOD_TABLE(NativeExecutable) };
 
 #if ENABLE(JIT)
-class ExecutableFinalizer : public WeakHandleOwner {
-    virtual void finalize(Handle<Unknown> handle, void*)
-    {
-        Weak<ExecutableBase> executable(Weak<ExecutableBase>::Adopt, handle);
-        executable->clearExecutableCode();
-    }
-};
+void NativeExecutable::destroy(JSCell* cell)
+{
+    static_cast<NativeExecutable*>(cell)->NativeExecutable::~NativeExecutable();
+}
+#endif
 
-WeakHandleOwner* ExecutableBase::executableFinalizer()
+#if ENABLE(DFG_JIT)
+Intrinsic NativeExecutable::intrinsic() const
 {
-    DEFINE_STATIC_LOCAL(ExecutableFinalizer, finalizer, ());
-    return &finalizer;
+    return m_intrinsic;
 }
 #endif
-    
-const ClassInfo NativeExecutable::s_info = { "NativeExecutable", &ExecutableBase::s_info, 0, 0 };
 
-NativeExecutable::~NativeExecutable()
+#if ENABLE(JIT)
+// Utility method used for jettisoning code blocks.
+template<typename T>
+static void jettisonCodeBlock(VM& vm, OwnPtr<T>& codeBlock)
 {
+    ASSERT(JITCode::isOptimizingJIT(codeBlock->getJITType()));
+    ASSERT(codeBlock->alternative());
+    OwnPtr<T> codeBlockToJettison = codeBlock.release();
+    codeBlock = static_pointer_cast<T>(codeBlockToJettison->releaseAlternative());
+    codeBlockToJettison->unlinkIncomingCalls();
+    vm.heap.jettisonDFGCodeBlock(static_pointer_cast<CodeBlock>(codeBlockToJettison.release()));
 }
+#endif
+
+const ClassInfo ScriptExecutable::s_info = { "ScriptExecutable", &ExecutableBase::s_info, 0, 0, CREATE_METHOD_TABLE(ScriptExecutable) };
 
-const ClassInfo ScriptExecutable::s_info = { "ScriptExecutable", &ExecutableBase::s_info, 0, 0 };
+#if ENABLE(JIT)
+void ScriptExecutable::destroy(JSCell* cell)
+{
+    static_cast<ScriptExecutable*>(cell)->ScriptExecutable::~ScriptExecutable();
+}
+#endif
 
-const ClassInfo EvalExecutable::s_info = { "EvalExecutable", &ScriptExecutable::s_info, 0, 0 };
+const ClassInfo EvalExecutable::s_info = { "EvalExecutable", &ScriptExecutable::s_info, 0, 0, CREATE_METHOD_TABLE(EvalExecutable) };
 
-EvalExecutable::EvalExecutable(ExecState* exec, const SourceCode& source, bool inStrictContext)
-    : ScriptExecutable(exec->globalData().evalExecutableStructure.get(), exec, source, inStrictContext)
+EvalExecutable::EvalExecutable(ExecState* exec, PassRefPtr<CodeCache> codeCache, const SourceCode& source, bool inStrictContext)
+    : ScriptExecutable(exec->vm().evalExecutableStructure.get(), exec, source, inStrictContext)
+    , m_codeCache(codeCache)
 {
 }
 
-EvalExecutable::~EvalExecutable()
+void EvalExecutable::destroy(JSCell* cell)
 {
+    static_cast<EvalExecutable*>(cell)->EvalExecutable::~EvalExecutable();
 }
 
-const ClassInfo ProgramExecutable::s_info = { "ProgramExecutable", &ScriptExecutable::s_info, 0, 0 };
+const ClassInfo ProgramExecutable::s_info = { "ProgramExecutable", &ScriptExecutable::s_info, 0, 0, CREATE_METHOD_TABLE(ProgramExecutable) };
 
 ProgramExecutable::ProgramExecutable(ExecState* exec, const SourceCode& source)
-    : ScriptExecutable(exec->globalData().programExecutableStructure.get(), exec, source, false)
+    : ScriptExecutable(exec->vm().programExecutableStructure.get(), exec, source, false)
 {
 }
 
-ProgramExecutable::~ProgramExecutable()
+void ProgramExecutable::destroy(JSCell* cell)
 {
+    static_cast<ProgramExecutable*>(cell)->ProgramExecutable::~ProgramExecutable();
 }
 
-const ClassInfo FunctionExecutable::s_info = { "FunctionExecutable", &ScriptExecutable::s_info, 0, 0 };
+const ClassInfo FunctionExecutable::s_info = { "FunctionExecutable", &ScriptExecutable::s_info, 0, 0, CREATE_METHOD_TABLE(FunctionExecutable) };
 
-FunctionExecutable::FunctionExecutable(JSGlobalData* globalData, const Identifier& name, const SourceCode& source, bool forceUsesArguments, FunctionParameters* parameters, bool inStrictContext, int firstLine, int lastLine)
-    : ScriptExecutable(globalData->functionExecutableStructure.get(), globalData, source, inStrictContext)
-    , m_numCapturedVariables(0)
-    , m_forceUsesArguments(forceUsesArguments)
-    , m_parameters(parameters)
-    , m_name(name)
-    , m_symbolTable(0)
+FunctionExecutable::FunctionExecutable(VM& vm, const SourceCode& source, UnlinkedFunctionExecutable* unlinkedExecutable, unsigned firstLine, unsigned lastLine, unsigned startColumn)
+    : ScriptExecutable(vm.functionExecutableStructure.get(), vm, source, unlinkedExecutable->isInStrictContext())
+    , m_unlinkedExecutable(vm, this, unlinkedExecutable)
 {
+    RELEASE_ASSERT(!source.isNull());
+    ASSERT(source.length());
     m_firstLine = firstLine;
     m_lastLine = lastLine;
+    m_startColumn = startColumn;
 }
 
-FunctionExecutable::FunctionExecutable(ExecState* exec, const Identifier& name, const SourceCode& source, bool forceUsesArguments, FunctionParameters* parameters, bool inStrictContext, int firstLine, int lastLine)
-    : ScriptExecutable(exec->globalData().functionExecutableStructure.get(), exec, source, inStrictContext)
-    , m_numCapturedVariables(0)
-    , m_forceUsesArguments(forceUsesArguments)
-    , m_parameters(parameters)
-    , m_name(name)
-    , m_symbolTable(0)
+void FunctionExecutable::destroy(JSCell* cell)
 {
-    m_firstLine = firstLine;
-    m_lastLine = lastLine;
+    static_cast<FunctionExecutable*>(cell)->FunctionExecutable::~FunctionExecutable();
 }
 
-
-JSObject* EvalExecutable::compileInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
+JSObject* EvalExecutable::compileOptimized(ExecState* exec, JSScope* scope, unsigned bytecodeIndex)
 {
-    JSObject* exception = 0;
-    JSGlobalData* globalData = &exec->globalData();
-    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
-    if (!lexicalGlobalObject->isEvalEnabled())
-        return throwError(exec, createEvalError(exec, "Eval is disabled"));
-    RefPtr<EvalNode> evalNode = globalData->parser->parse<EvalNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
-    if (!evalNode) {
-        ASSERT(exception);
-        return exception;
-    }
-    recordParse(evalNode->features(), evalNode->hasCapturedVariables(), evalNode->lineNo(), evalNode->lastLine());
+    ASSERT(exec->vm().dynamicGlobalObject);
+    ASSERT(!!m_evalCodeBlock);
+    JSObject* error = 0;
+    if (m_evalCodeBlock->getJITType() != JITCode::topTierJIT())
+        error = compileInternal(exec, scope, JITCode::nextTierJIT(m_evalCodeBlock->getJITType()), bytecodeIndex);
+    ASSERT(!!m_evalCodeBlock);
+    return error;
+}
 
-    JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
+#if ENABLE(JIT)
+bool EvalExecutable::jitCompile(ExecState* exec)
+{
+    return jitCompileIfAppropriate(exec, m_evalCodeBlock, m_jitCodeForCall, JITCode::bottomTierJIT(), UINT_MAX, JITCompilationCanFail);
+}
+#endif
 
-    ASSERT(!m_evalCodeBlock);
-    m_evalCodeBlock = adoptPtr(new EvalCodeBlock(this, globalObject, source().provider(), scopeChainNode->localDepth()));
-    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(evalNode.get(), scopeChainNode, m_evalCodeBlock->symbolTable(), m_evalCodeBlock.get())));
-    if ((exception = generator->generate())) {
-        m_evalCodeBlock.clear();
-        evalNode->destroyData();
-        return exception;
+inline const char* samplingDescription(JITCode::JITType jitType)
+{
+    switch (jitType) {
+    case JITCode::InterpreterThunk:
+        return "Interpreter Compilation (TOTAL)";
+    case JITCode::BaselineJIT:
+        return "Baseline Compilation (TOTAL)";
+    case JITCode::DFGJIT:
+        return "DFG Compilation (TOTAL)";
+    default:
+        RELEASE_ASSERT_NOT_REACHED();
+        return 0;
     }
+}
 
-    evalNode->destroyData();
-
-#if ENABLE(JIT)
-    if (exec->globalData().canUseJIT()) {
-        m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_evalCodeBlock.get());
-#if !ENABLE(OPCODE_SAMPLING)
-        if (!BytecodeGenerator::dumpsGeneratedCode())
-            m_evalCodeBlock->discardBytecode();
+JSObject* EvalExecutable::compileInternal(ExecState* exec, JSScope* scope, JITCode::JITType jitType, unsigned bytecodeIndex)
+{
+    SamplingRegion samplingRegion(samplingDescription(jitType));
+    
+#if !ENABLE(JIT)
+    UNUSED_PARAM(jitType);
+    UNUSED_PARAM(bytecodeIndex);
 #endif
+    VM* vm = &exec->vm();
+    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
+    
+    if (!!m_evalCodeBlock) {
+        OwnPtr<EvalCodeBlock> newCodeBlock = adoptPtr(new EvalCodeBlock(CodeBlock::CopyParsedBlock, *m_evalCodeBlock));
+        newCodeBlock->setAlternative(static_pointer_cast<CodeBlock>(m_evalCodeBlock.release()));
+        m_evalCodeBlock = newCodeBlock.release();
+    } else {
+        UNUSED_PARAM(scope);
+        UNUSED_PARAM(vm);
+        UNUSED_PARAM(lexicalGlobalObject);
+        if (!lexicalGlobalObject->evalEnabled())
+            return throwError(exec, createEvalError(exec, lexicalGlobalObject->evalDisabledErrorMessage()));
+
+        JSObject* exception = 0;
+        UnlinkedEvalCodeBlock* unlinkedEvalCode = lexicalGlobalObject->createEvalCodeBlock(m_codeCache.get(), exec, scope, this, &exception);
+        if (!unlinkedEvalCode)
+            return exception;
+
+        OwnPtr<CodeBlock> previousCodeBlock = m_evalCodeBlock.release();
+        ASSERT((jitType == JITCode::bottomTierJIT()) == !previousCodeBlock);
+        m_unlinkedEvalCodeBlock.set(*vm, this, unlinkedEvalCode);
+        m_evalCodeBlock = adoptPtr(new EvalCodeBlock(this, unlinkedEvalCode, lexicalGlobalObject, source().provider(), scope->localDepth(), previousCodeBlock.release()));
+        m_evalCodeBlock->copyPostParseDataFromAlternative();
     }
-#endif
 
 #if ENABLE(JIT)
-#if ENABLE(INTERPRETER)
-    if (!m_jitCodeForCall)
-        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock));
-    else
+    if (!prepareForExecution(exec, m_evalCodeBlock, m_jitCodeForCall, jitType, bytecodeIndex))
+        return 0;
 #endif
+
+#if ENABLE(JIT)
     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock) + m_jitCodeForCall.size());
 #else
     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock));
@@ -166,14 +238,25 @@ JSObject* EvalExecutable::compileInternal(ExecState* exec, ScopeChainNode* scope
     return 0;
 }
 
-void EvalExecutable::visitChildren(SlotVisitor& visitor)
+#if ENABLE(JIT)
+void EvalExecutable::jettisonOptimizedCode(VM& vm)
+{
+    jettisonCodeBlock(vm, m_evalCodeBlock);
+    m_jitCodeForCall = m_evalCodeBlock->getJITCode();
+    ASSERT(!m_jitCodeForCallWithArityCheck);
+}
+#endif
+
+void EvalExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
 {
-    ASSERT_GC_OBJECT_INHERITS(this, &s_info);
+    EvalExecutable* thisObject = jsCast<EvalExecutable*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
-    ASSERT(structure()->typeInfo().overridesVisitChildren());
-    ScriptExecutable::visitChildren(visitor);
-    if (m_evalCodeBlock)
-        m_evalCodeBlock->visitAggregate(visitor);
+    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
+    ScriptExecutable::visitChildren(thisObject, visitor);
+    if (thisObject->m_evalCodeBlock)
+        thisObject->m_evalCodeBlock->visitAggregate(visitor);
+    visitor.append(&thisObject->m_unlinkedEvalCodeBlock);
 }
 
 void EvalExecutable::unlinkCalls()
@@ -181,66 +264,74 @@ void EvalExecutable::unlinkCalls()
 #if ENABLE(JIT)
     if (!m_jitCodeForCall)
         return;
-    ASSERT(m_evalCodeBlock);
+    RELEASE_ASSERT(m_evalCodeBlock);
     m_evalCodeBlock->unlinkCalls();
 #endif
 }
 
+void EvalExecutable::clearCode()
+{
+    m_evalCodeBlock.clear();
+    m_unlinkedEvalCodeBlock.clear();
+    Base::clearCode();
+}
+
 JSObject* ProgramExecutable::checkSyntax(ExecState* exec)
 {
-    JSObject* exception = 0;
-    JSGlobalData* globalData = &exec->globalData();
+    ParserError error;
+    VM* vm = &exec->vm();
     JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
-    RefPtr<ProgramNode> programNode = globalData->parser->parse<ProgramNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, JSParseNormal, &exception);
+    RefPtr<ProgramNode> programNode = parse<ProgramNode>(vm, m_source, 0, Identifier(), JSParseNormal, ProgramNode::isFunctionNode ? JSParseFunctionCode : JSParseProgramCode, error);
     if (programNode)
         return 0;
-    ASSERT(exception);
-    return exception;
+    ASSERT(error.m_type != ParserError::ErrorNone);
+    return error.toErrorObject(lexicalGlobalObject, m_source);
 }
 
-JSObject* ProgramExecutable::compileInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
+JSObject* ProgramExecutable::compileOptimized(ExecState* exec, JSScope* scope, unsigned bytecodeIndex)
 {
-    ASSERT(!m_programCodeBlock);
+    RELEASE_ASSERT(exec->vm().dynamicGlobalObject);
+    ASSERT(!!m_programCodeBlock);
+    JSObject* error = 0;
+    if (m_programCodeBlock->getJITType() != JITCode::topTierJIT())
+        error = compileInternal(exec, scope, JITCode::nextTierJIT(m_programCodeBlock->getJITType()), bytecodeIndex);
+    ASSERT(!!m_programCodeBlock);
+    return error;
+}
 
-    JSObject* exception = 0;
-    JSGlobalData* globalData = &exec->globalData();
-    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
-    RefPtr<ProgramNode> programNode = globalData->parser->parse<ProgramNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
-    if (!programNode) {
-        ASSERT(exception);
-        return exception;
-    }
-    recordParse(programNode->features(), programNode->hasCapturedVariables(), programNode->lineNo(), programNode->lastLine());
+#if ENABLE(JIT)
+bool ProgramExecutable::jitCompile(ExecState* exec)
+{
+    return jitCompileIfAppropriate(exec, m_programCodeBlock, m_jitCodeForCall, JITCode::bottomTierJIT(), UINT_MAX, JITCompilationCanFail);
+}
+#endif
 
-    JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
+JSObject* ProgramExecutable::compileInternal(ExecState* exec, JSScope* scope, JITCode::JITType jitType, unsigned bytecodeIndex)
+{
+    SamplingRegion samplingRegion(samplingDescription(jitType));
     
-    m_programCodeBlock = adoptPtr(new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider()));
-    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(programNode.get(), scopeChainNode, &globalObject->symbolTable(), m_programCodeBlock.get())));
-    if ((exception = generator->generate())) {
-        m_programCodeBlock.clear();
-        programNode->destroyData();
-        return exception;
+#if !ENABLE(JIT)
+    UNUSED_PARAM(exec);
+    UNUSED_PARAM(jitType);
+    UNUSED_PARAM(bytecodeIndex);
+#endif
+    if (!!m_programCodeBlock) {
+        OwnPtr<ProgramCodeBlock> newCodeBlock = adoptPtr(new ProgramCodeBlock(CodeBlock::CopyParsedBlock, *m_programCodeBlock));
+        newCodeBlock->setAlternative(static_pointer_cast<CodeBlock>(m_programCodeBlock.release()));
+        m_programCodeBlock = newCodeBlock.release();
+    } else {
+        JSGlobalObject* globalObject = scope->globalObject();
+        m_programCodeBlock = adoptPtr(new ProgramCodeBlock(this, m_unlinkedProgramCodeBlock.get(), globalObject, source().provider(), source().startColumn(), m_programCodeBlock.release()));
+        m_programCodeBlock->copyPostParseDataFromAlternative();
     }
 
-    programNode->destroyData();
-
 #if ENABLE(JIT)
-    if (exec->globalData().canUseJIT()) {
-        m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_programCodeBlock.get());
-#if !ENABLE(OPCODE_SAMPLING)
-        if (!BytecodeGenerator::dumpsGeneratedCode())
-            m_programCodeBlock->discardBytecode();
-#endif
-    }
+    if (!prepareForExecution(exec, m_programCodeBlock, m_jitCodeForCall, jitType, bytecodeIndex))
+        return 0;
 #endif
 
 #if ENABLE(JIT)
-#if ENABLE(INTERPRETER)
-    if (!m_jitCodeForCall)
-        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock));
-    else
-#endif
-        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock) + m_jitCodeForCall.size());
+    Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock) + m_jitCodeForCall.size());
 #else
     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock));
 #endif
@@ -248,106 +339,214 @@ JSObject* ProgramExecutable::compileInternal(ExecState* exec, ScopeChainNode* sc
     return 0;
 }
 
+#if ENABLE(JIT)
+void ProgramExecutable::jettisonOptimizedCode(VM& vm)
+{
+    jettisonCodeBlock(vm, m_programCodeBlock);
+    m_jitCodeForCall = m_programCodeBlock->getJITCode();
+    ASSERT(!m_jitCodeForCallWithArityCheck);
+}
+#endif
+
 void ProgramExecutable::unlinkCalls()
 {
 #if ENABLE(JIT)
     if (!m_jitCodeForCall)
         return;
-    ASSERT(m_programCodeBlock);
+    RELEASE_ASSERT(m_programCodeBlock);
     m_programCodeBlock->unlinkCalls();
 #endif
 }
 
-#if ENABLE(JIT)
-static bool tryDFGCompile(JSGlobalData* globalData, CodeBlock* codeBlock, JITCode& jitCode, MacroAssemblerCodePtr& jitCodeWithArityCheck)
+int ProgramExecutable::addGlobalVar(JSGlobalObject* globalObject, const Identifier& ident, ConstantMode constantMode, FunctionMode functionMode)
 {
-#if ENABLE(DFG_JIT)
-#if ENABLE(DFG_JIT_RESTRICTIONS)
-    // FIXME: No flow control yet supported, don't bother scanning the bytecode if there are any jump targets.
-    // FIXME: temporarily disable property accesses until we fix regressions.
-    if (codeBlock->numberOfJumpTargets() || codeBlock->numberOfStructureStubInfos())
-        return false;
-#endif
+    // Try to share the symbolTable if possible
+    SharedSymbolTable* symbolTable = globalObject->symbolTable();
+    UNUSED_PARAM(functionMode);
+    int index = symbolTable->size();
+    SymbolTableEntry newEntry(index, (constantMode == IsConstant) ? ReadOnly : 0);
+    if (functionMode == IsFunctionToSpecialize)
+        newEntry.attemptToWatch();
+    SymbolTable::AddResult result = symbolTable->add(ident.impl(), newEntry);
+    if (!result.isNewEntry) {
+        result.iterator->value.notifyWrite();
+        index = result.iterator->value.getIndex();
+    }
+    return index;
+}
 
-    DFG::Graph dfg(codeBlock->m_numParameters, codeBlock->m_numVars);
-    if (!parse(dfg, globalData, codeBlock))
-        return false;
+JSObject* ProgramExecutable::initializeGlobalProperties(VM& vm, CallFrame* callFrame, JSScope* scope)
+{
+    RELEASE_ASSERT(scope);
+    JSGlobalObject* globalObject = scope->globalObject();
+    RELEASE_ASSERT(globalObject);
+    ASSERT(&globalObject->vm() == &vm);
 
-    DFG::JITCompiler dataFlowJIT(globalData, dfg, codeBlock);
-    dataFlowJIT.compileFunction(jitCode, jitCodeWithArityCheck);
-    return true;
-#else
-    UNUSED_PARAM(globalData);
-    UNUSED_PARAM(codeBlock);
-    UNUSED_PARAM(jitCode);
-    UNUSED_PARAM(jitCodeWithArityCheck);
-    return false;
-#endif
+    JSObject* exception = 0;
+    UnlinkedProgramCodeBlock* unlinkedCode = globalObject->createProgramCodeBlock(callFrame, this, &exception);
+    if (exception)
+        return exception;
+
+    m_unlinkedProgramCodeBlock.set(vm, this, unlinkedCode);
+
+    BatchedTransitionOptimizer optimizer(vm, globalObject);
+
+    const UnlinkedProgramCodeBlock::VariableDeclations& variableDeclarations = unlinkedCode->variableDeclarations();
+    const UnlinkedProgramCodeBlock::FunctionDeclations& functionDeclarations = unlinkedCode->functionDeclarations();
+
+    size_t newGlobals = variableDeclarations.size() + functionDeclarations.size();
+    if (!newGlobals)
+        return 0;
+    globalObject->addRegisters(newGlobals);
+    CallFrame* globalExec = globalObject->globalExec();
+
+    for (size_t i = 0; i < functionDeclarations.size(); ++i) {
+        bool propertyDidExist = globalObject->removeDirect(vm, functionDeclarations[i].first); // Newly declared functions overwrite existing properties.
+        UnlinkedFunctionExecutable* unlinkedFunctionExecutable = functionDeclarations[i].second.get();
+        JSValue value = JSFunction::create(globalExec, unlinkedFunctionExecutable->link(vm, m_source, lineNo(), 0), scope);
+        int index = addGlobalVar(globalObject, functionDeclarations[i].first, IsVariable,
+            !propertyDidExist ? IsFunctionToSpecialize : NotFunctionOrNotSpecializable);
+        globalObject->registerAt(index).set(vm, globalObject, value);
+    }
+
+    for (size_t i = 0; i < variableDeclarations.size(); ++i) {
+        if (globalObject->hasProperty(globalExec, variableDeclarations[i].first))
+            continue;
+        addGlobalVar(globalObject, variableDeclarations[i].first,
+            (variableDeclarations[i].second & DeclarationStacks::IsConstant) ? IsConstant : IsVariable,
+            NotFunctionOrNotSpecializable);
+    }
+    return 0;
 }
-#endif
 
-void ProgramExecutable::visitChildren(SlotVisitor& visitor)
+void ProgramExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
 {
-    ASSERT_GC_OBJECT_INHERITS(this, &s_info);
+    ProgramExecutable* thisObject = jsCast<ProgramExecutable*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
-    ASSERT(structure()->typeInfo().overridesVisitChildren());
-    ScriptExecutable::visitChildren(visitor);
-    if (m_programCodeBlock)
-        m_programCodeBlock->visitAggregate(visitor);
+    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
+    ScriptExecutable::visitChildren(thisObject, visitor);
+    visitor.append(&thisObject->m_unlinkedProgramCodeBlock);
+    if (thisObject->m_programCodeBlock)
+        thisObject->m_programCodeBlock->visitAggregate(visitor);
 }
 
-JSObject* FunctionExecutable::compileForCallInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
+void ProgramExecutable::clearCode()
 {
-    JSObject* exception = 0;
-    JSGlobalData* globalData = scopeChainNode->globalData;
-    RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(exec->lexicalGlobalObject(), 0, 0, m_source, m_parameters.get(), isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
-    if (!body) {
-        ASSERT(exception);
-        return exception;
-    }
-    if (m_forceUsesArguments)
-        body->setUsesArguments();
-    body->finishParsing(m_parameters, m_name);
-    recordParse(body->features(), body->hasCapturedVariables(), body->lineNo(), body->lastLine());
-
-    JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
-
-    ASSERT(!m_codeBlockForCall);
-    m_codeBlockForCall = adoptPtr(new FunctionCodeBlock(this, FunctionCode, globalObject, source().provider(), source().startOffset(), false));
-    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(body.get(), scopeChainNode, m_codeBlockForCall->symbolTable(), m_codeBlockForCall.get())));
-    if ((exception = generator->generate())) {
-        m_codeBlockForCall.clear();
-        body->destroyData();
-        return exception;
+    m_programCodeBlock.clear();
+    m_unlinkedProgramCodeBlock.clear();
+    Base::clearCode();
+}
+
+FunctionCodeBlock* FunctionExecutable::baselineCodeBlockFor(CodeSpecializationKind kind)
+{
+    FunctionCodeBlock* result;
+    if (kind == CodeForCall)
+        result = m_codeBlockForCall.get();
+    else {
+        RELEASE_ASSERT(kind == CodeForConstruct);
+        result = m_codeBlockForConstruct.get();
     }
+    if (!result)
+        return 0;
+    while (result->alternative())
+        result = static_cast<FunctionCodeBlock*>(result->alternative());
+    RELEASE_ASSERT(result);
+    ASSERT(JITCode::isBaselineCode(result->getJITType()));
+    return result;
+}
 
-    m_numParametersForCall = m_codeBlockForCall->m_numParameters;
-    ASSERT(m_numParametersForCall);
-    m_numCapturedVariables = m_codeBlockForCall->m_numCapturedVars;
-    m_symbolTable = m_codeBlockForCall->sharedSymbolTable();
+JSObject* FunctionExecutable::compileOptimizedForCall(ExecState* exec, JSScope* scope, unsigned bytecodeIndex)
+{
+    RELEASE_ASSERT(exec->vm().dynamicGlobalObject);
+    ASSERT(!!m_codeBlockForCall);
+    JSObject* error = 0;
+    if (m_codeBlockForCall->getJITType() != JITCode::topTierJIT())
+        error = compileForCallInternal(exec, scope, JITCode::nextTierJIT(m_codeBlockForCall->getJITType()), bytecodeIndex);
+    ASSERT(!!m_codeBlockForCall);
+    return error;
+}
 
-    body->destroyData();
+JSObject* FunctionExecutable::compileOptimizedForConstruct(ExecState* exec, JSScope* scope, unsigned bytecodeIndex)
+{
+    RELEASE_ASSERT(exec->vm().dynamicGlobalObject);
+    ASSERT(!!m_codeBlockForConstruct);
+    JSObject* error = 0;
+    if (m_codeBlockForConstruct->getJITType() != JITCode::topTierJIT())
+        error = compileForConstructInternal(exec, scope, JITCode::nextTierJIT(m_codeBlockForConstruct->getJITType()), bytecodeIndex);
+    ASSERT(!!m_codeBlockForConstruct);
+    return error;
+}
 
 #if ENABLE(JIT)
-    if (exec->globalData().canUseJIT()) {
-        bool dfgCompiled = tryDFGCompile(&exec->globalData(), m_codeBlockForCall.get(), m_jitCodeForCall, m_jitCodeForCallWithArityCheck);
-        if (!dfgCompiled)
-            m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_codeBlockForCall.get(), &m_jitCodeForCallWithArityCheck);
-
-#if !ENABLE(OPCODE_SAMPLING)
-        if (!BytecodeGenerator::dumpsGeneratedCode())
-            m_codeBlockForCall->discardBytecode();
+bool FunctionExecutable::jitCompileForCall(ExecState* exec)
+{
+    return jitCompileFunctionIfAppropriate(exec, m_codeBlockForCall, m_jitCodeForCall, m_jitCodeForCallWithArityCheck, JITCode::bottomTierJIT(), UINT_MAX, JITCompilationCanFail);
+}
+
+bool FunctionExecutable::jitCompileForConstruct(ExecState* exec)
+{
+    return jitCompileFunctionIfAppropriate(exec, m_codeBlockForConstruct, m_jitCodeForConstruct, m_jitCodeForConstructWithArityCheck, JITCode::bottomTierJIT(), UINT_MAX, JITCompilationCanFail);
+}
 #endif
+
+PassOwnPtr<FunctionCodeBlock> FunctionExecutable::produceCodeBlockFor(JSScope* scope, CodeSpecializationKind specializationKind, JSObject*& exception)
+{
+    if (!!codeBlockFor(specializationKind))
+        return adoptPtr(new FunctionCodeBlock(CodeBlock::CopyParsedBlock, *codeBlockFor(specializationKind)));
+
+    VM* vm = scope->vm();
+    JSGlobalObject* globalObject = scope->globalObject();
+    ParserError error;
+    DebuggerMode debuggerMode = globalObject->hasDebugger() ? DebuggerOn : DebuggerOff;
+    ProfilerMode profilerMode = globalObject->hasProfiler() ? ProfilerOn : ProfilerOff;
+    UnlinkedFunctionCodeBlock* unlinkedCodeBlock = m_unlinkedExecutable->codeBlockFor(*vm, scope, m_source, specializationKind, debuggerMode, profilerMode, error);
+    recordParse(m_unlinkedExecutable->features(), m_unlinkedExecutable->hasCapturedVariables(), lineNo(), lastLine(), startColumn());
+
+    if (!unlinkedCodeBlock) {
+        exception = error.toErrorObject(globalObject, m_source);
+        return nullptr;
     }
+
+    SourceProvider* provider = source().provider();
+    unsigned sourceOffset = source().startOffset();
+    unsigned startColumn = source().startColumn();
+
+    OwnPtr<FunctionCodeBlock> result = adoptPtr(new FunctionCodeBlock(this, unlinkedCodeBlock, globalObject, provider, sourceOffset, startColumn));
+    result->copyPostParseDataFrom(codeBlockFor(specializationKind).get());
+    return result.release();
+}
+
+
+JSObject* FunctionExecutable::compileForCallInternal(ExecState* exec, JSScope* scope, JITCode::JITType jitType, unsigned bytecodeIndex)
+{
+    SamplingRegion samplingRegion(samplingDescription(jitType));
+    
+#if !ENABLE(JIT)
+    UNUSED_PARAM(exec);
+    UNUSED_PARAM(jitType);
+    UNUSED_PARAM(exec);
+    UNUSED_PARAM(bytecodeIndex);
 #endif
+    ASSERT((jitType == JITCode::bottomTierJIT()) == !m_codeBlockForCall);
+    JSObject* exception = 0;
+    OwnPtr<FunctionCodeBlock> newCodeBlock = produceCodeBlockFor(scope, CodeForCall, exception);
+    if (!newCodeBlock)
+        return exception;
+
+    newCodeBlock->setAlternative(static_pointer_cast<CodeBlock>(m_codeBlockForCall.release()));
+    m_codeBlockForCall = newCodeBlock.release();
+    
+    m_numParametersForCall = m_codeBlockForCall->numParameters();
+    RELEASE_ASSERT(m_numParametersForCall);
 
 #if ENABLE(JIT)
-#if ENABLE(INTERPRETER)
-    if (!m_jitCodeForCall)
-        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall));
-    else
+    if (!prepareFunctionForExecution(exec, m_codeBlockForCall, m_jitCodeForCall, m_jitCodeForCallWithArityCheck, jitType, bytecodeIndex, CodeForCall))
+        return 0;
 #endif
-        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall) + m_jitCodeForCall.size());
+
+#if ENABLE(JIT)
+    Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall) + m_jitCodeForCall.size());
 #else
     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall));
 #endif
@@ -355,54 +554,34 @@ JSObject* FunctionExecutable::compileForCallInternal(ExecState* exec, ScopeChain
     return 0;
 }
 
-JSObject* FunctionExecutable::compileForConstructInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
+JSObject* FunctionExecutable::compileForConstructInternal(ExecState* exec, JSScope* scope, JITCode::JITType jitType, unsigned bytecodeIndex)
 {
+    SamplingRegion samplingRegion(samplingDescription(jitType));
+    
+#if !ENABLE(JIT)
+    UNUSED_PARAM(jitType);
+    UNUSED_PARAM(exec);
+    UNUSED_PARAM(bytecodeIndex);
+#endif
+    
+    ASSERT((jitType == JITCode::bottomTierJIT()) == !m_codeBlockForConstruct);
     JSObject* exception = 0;
-    JSGlobalData* globalData = scopeChainNode->globalData;
-    RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(exec->lexicalGlobalObject(), 0, 0, m_source, m_parameters.get(), isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
-    if (!body) {
-        ASSERT(exception);
+    OwnPtr<FunctionCodeBlock> newCodeBlock = produceCodeBlockFor(scope, CodeForConstruct, exception);
+    if (!newCodeBlock)
         return exception;
-    }
-    if (m_forceUsesArguments)
-        body->setUsesArguments();
-    body->finishParsing(m_parameters, m_name);
-    recordParse(body->features(), body->hasCapturedVariables(), body->lineNo(), body->lastLine());
-
-    JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
-
-    ASSERT(!m_codeBlockForConstruct);
-    m_codeBlockForConstruct = adoptPtr(new FunctionCodeBlock(this, FunctionCode, globalObject, source().provider(), source().startOffset(), true));
-    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(body.get(), scopeChainNode, m_codeBlockForConstruct->symbolTable(), m_codeBlockForConstruct.get())));
-    if ((exception = generator->generate())) {
-        m_codeBlockForConstruct.clear();
-        body->destroyData();
-        return exception;
-    }
 
-    m_numParametersForConstruct = m_codeBlockForConstruct->m_numParameters;
-    ASSERT(m_numParametersForConstruct);
-    m_numCapturedVariables = m_codeBlockForConstruct->m_numCapturedVars;
-    m_symbolTable = m_codeBlockForConstruct->sharedSymbolTable();
-
-    body->destroyData();
+    newCodeBlock->setAlternative(static_pointer_cast<CodeBlock>(m_codeBlockForConstruct.release()));
+    m_codeBlockForConstruct = newCodeBlock.release();
+    
+    m_numParametersForConstruct = m_codeBlockForConstruct->numParameters();
+    RELEASE_ASSERT(m_numParametersForConstruct);
 
 #if ENABLE(JIT)
-    if (exec->globalData().canUseJIT()) {
-        m_jitCodeForConstruct = JIT::compile(scopeChainNode->globalData, m_codeBlockForConstruct.get(), &m_jitCodeForConstructWithArityCheck);
-#if !ENABLE(OPCODE_SAMPLING)
-        if (!BytecodeGenerator::dumpsGeneratedCode())
-            m_codeBlockForConstruct->discardBytecode();
-#endif
-    }
+    if (!prepareFunctionForExecution(exec, m_codeBlockForConstruct, m_jitCodeForConstruct, m_jitCodeForConstructWithArityCheck, jitType, bytecodeIndex, CodeForConstruct))
+        return 0;
 #endif
 
 #if ENABLE(JIT)
-#if ENABLE(INTERPRETER)
-    if (!m_jitCodeForConstruct)
-        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct));
-    else
-#endif
     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct) + m_jitCodeForConstruct.size());
 #else
     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct));
@@ -411,90 +590,109 @@ JSObject* FunctionExecutable::compileForConstructInternal(ExecState* exec, Scope
     return 0;
 }
 
-void FunctionExecutable::visitChildren(SlotVisitor& visitor)
+#if ENABLE(JIT)
+void FunctionExecutable::jettisonOptimizedCodeForCall(VM& vm)
+{
+    jettisonCodeBlock(vm, m_codeBlockForCall);
+    m_jitCodeForCall = m_codeBlockForCall->getJITCode();
+    m_jitCodeForCallWithArityCheck = m_codeBlockForCall->getJITCodeWithArityCheck();
+}
+
+void FunctionExecutable::jettisonOptimizedCodeForConstruct(VM& vm)
+{
+    jettisonCodeBlock(vm, m_codeBlockForConstruct);
+    m_jitCodeForConstruct = m_codeBlockForConstruct->getJITCode();
+    m_jitCodeForConstructWithArityCheck = m_codeBlockForConstruct->getJITCodeWithArityCheck();
+}
+#endif
+
+void FunctionExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
 {
-    ASSERT_GC_OBJECT_INHERITS(this, &s_info);
+    FunctionExecutable* thisObject = jsCast<FunctionExecutable*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
-    ASSERT(structure()->typeInfo().overridesVisitChildren());
-    ScriptExecutable::visitChildren(visitor);
-    if (m_codeBlockForCall)
-        m_codeBlockForCall->visitAggregate(visitor);
-    if (m_codeBlockForConstruct)
-        m_codeBlockForConstruct->visitAggregate(visitor);
+    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
+    ScriptExecutable::visitChildren(thisObject, visitor);
+    if (thisObject->m_codeBlockForCall)
+        thisObject->m_codeBlockForCall->visitAggregate(visitor);
+    if (thisObject->m_codeBlockForConstruct)
+        thisObject->m_codeBlockForConstruct->visitAggregate(visitor);
+    visitor.append(&thisObject->m_unlinkedExecutable);
 }
 
-void FunctionExecutable::discardCode()
+void FunctionExecutable::clearCodeIfNotCompiling()
 {
-#if ENABLE(JIT)
-    // These first two checks are to handle the rare case where
-    // we are trying to evict code for a function during its
-    // codegen.
-    if (!m_jitCodeForCall && m_codeBlockForCall)
+    if (isCompiling())
         return;
-    if (!m_jitCodeForConstruct && m_codeBlockForConstruct)
+    clearCode();
+}
+
+void FunctionExecutable::clearUnlinkedCodeForRecompilationIfNotCompiling()
+{
+    if (isCompiling())
         return;
-    m_jitCodeForCall = JITCode();
-    m_jitCodeForConstruct = JITCode();
-    m_jitCodeForCallWithArityCheck = MacroAssemblerCodePtr();
-    m_jitCodeForConstructWithArityCheck = MacroAssemblerCodePtr();
-#endif
-    if (m_codeBlockForCall)
-        m_codeBlockForCall->clearEvalCache();
+    m_unlinkedExecutable->clearCodeForRecompilation();
+}
+
+void FunctionExecutable::clearCode()
+{
     m_codeBlockForCall.clear();
-    if (m_codeBlockForConstruct)
-        m_codeBlockForConstruct->clearEvalCache();
     m_codeBlockForConstruct.clear();
-    m_numParametersForCall = NUM_PARAMETERS_NOT_COMPILED;
-    m_numParametersForConstruct = NUM_PARAMETERS_NOT_COMPILED;
-
+    Base::clearCode();
 }
 
 void FunctionExecutable::unlinkCalls()
 {
 #if ENABLE(JIT)
     if (!!m_jitCodeForCall) {
-        ASSERT(m_codeBlockForCall);
+        RELEASE_ASSERT(m_codeBlockForCall);
         m_codeBlockForCall->unlinkCalls();
     }
     if (!!m_jitCodeForConstruct) {
-        ASSERT(m_codeBlockForConstruct);
+        RELEASE_ASSERT(m_codeBlockForConstruct);
         m_codeBlockForConstruct->unlinkCalls();
     }
 #endif
 }
 
-FunctionExecutable* FunctionExecutable::fromGlobalCode(const Identifier& functionName, ExecState* exec, Debugger* debugger, const SourceCode& source, JSObject** exception)
+FunctionExecutable* FunctionExecutable::fromGlobalCode(const Identifier& name, ExecState* exec, Debugger* debugger, const SourceCode& source, JSObject** exception)
 {
-    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
-    RefPtr<ProgramNode> program = exec->globalData().parser->parse<ProgramNode>(lexicalGlobalObject, debugger, exec, source, 0, JSParseNormal, exception);
-    if (!program) {
-        ASSERT(*exception);
+    UnlinkedFunctionExecutable* unlinkedFunction = UnlinkedFunctionExecutable::fromGlobalCode(name, exec, debugger, source, exception);
+    if (!unlinkedFunction)
         return 0;
-    }
+    unsigned firstLine = source.firstLine() + unlinkedFunction->firstLineOffset();
+    unsigned startOffset = source.startOffset() + unlinkedFunction->startOffset();
+    unsigned startColumn = source.startColumn();
+    unsigned sourceLength = unlinkedFunction->sourceLength();
+    SourceCode functionSource(source.provider(), startOffset, startOffset + sourceLength, firstLine, startColumn);
+    return FunctionExecutable::create(exec->vm(), functionSource, unlinkedFunction, firstLine, unlinkedFunction->lineCount(), startColumn);
+}
+
+String FunctionExecutable::paramString() const
+{
+    return m_unlinkedExecutable->paramString();
+}
 
-    // Uses of this function that would not result in a single function expression are invalid.
-    StatementNode* exprStatement = program->singleStatement();
-    ASSERT(exprStatement);
-    ASSERT(exprStatement->isExprStatement());
-    ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
-    ASSERT(funcExpr);
-    ASSERT(funcExpr->isFuncExprNode());
-    FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
-    ASSERT(body);
+CodeBlockHash ExecutableBase::hashFor(CodeSpecializationKind kind) const
+{
+    if (this->classInfo() == &NativeExecutable::s_info)
+        return jsCast<const NativeExecutable*>(this)->hashFor(kind);
+    
+    return jsCast<const ScriptExecutable*>(this)->hashFor(kind);
+}
 
-    return FunctionExecutable::create(&exec->globalData(), functionName, body->source(), body->usesArguments(), body->parameters(), body->isStrictMode(), body->lineNo(), body->lastLine());
+CodeBlockHash NativeExecutable::hashFor(CodeSpecializationKind kind) const
+{
+    if (kind == CodeForCall)
+        return CodeBlockHash(static_cast<unsigned>(bitwise_cast<size_t>(m_function)));
+    
+    RELEASE_ASSERT(kind == CodeForConstruct);
+    return CodeBlockHash(static_cast<unsigned>(bitwise_cast<size_t>(m_constructor)));
 }
 
-UString FunctionExecutable::paramString() const
+CodeBlockHash ScriptExecutable::hashFor(CodeSpecializationKind kind) const
 {
-    FunctionParameters& parameters = *m_parameters;
-    UStringBuilder builder;
-    for (size_t pos = 0; pos < parameters.size(); ++pos) {
-        if (!builder.isEmpty())
-            builder.append(", ");
-        builder.append(parameters[pos].ustring());
-    }
-    return builder.toUString();
+    return CodeBlockHash(source(), kind);
 }
 
 }