X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/f9bf01c6616d5ddcf65b13b33cedf9e387ff7a63..ed1e77d3adeb83d26fd1dfb16dd84cabdcefd250:/runtime/Executable.cpp?ds=inline

diff --git a/runtime/Executable.cpp b/runtime/Executable.cpp
index bc18cc9..55240fd 100644
--- a/runtime/Executable.cpp
+++ b/runtime/Executable.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2009, 2010, 2013, 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
@@ -26,255 +26,659 @@
 #include "config.h"
 #include "Executable.h"
 
-#include "BytecodeGenerator.h"
+#include "BatchedTransitionOptimizer.h"
 #include "CodeBlock.h"
+#include "DFGDriver.h"
 #include "JIT.h"
+#include "JSCInlines.h"
+#include "JSFunctionNameScope.h"
+#include "LLIntEntrypoint.h"
 #include "Parser.h"
-#include "StringBuilder.h"
-#include "Vector.h"
+#include "ProfilerDatabase.h"
+#include "TypeProfiler.h"
+#include <wtf/CommaPrinter.h>
+#include <wtf/Vector.h>
+#include <wtf/text/StringBuilder.h>
 
 namespace JSC {
 
+const ClassInfo ExecutableBase::s_info = { "Executable", 0, 0, CREATE_METHOD_TABLE(ExecutableBase) };
+
+void ExecutableBase::destroy(JSCell* cell)
+{
+    static_cast<ExecutableBase*>(cell)->ExecutableBase::~ExecutableBase();
+}
+
+void ExecutableBase::clearCode()
+{
 #if ENABLE(JIT)
-NativeExecutable::~NativeExecutable()
+    m_jitCodeForCall = nullptr;
+    m_jitCodeForConstruct = nullptr;
+    m_jitCodeForCallWithArityCheck = MacroAssemblerCodePtr();
+    m_jitCodeForConstructWithArityCheck = MacroAssemblerCodePtr();
+    m_jitCodeForCallWithArityCheckAndPreserveRegs = MacroAssemblerCodePtr();
+    m_jitCodeForConstructWithArityCheckAndPreserveRegs = 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
 
-VPtrHackExecutable::~VPtrHackExecutable()
+const ClassInfo NativeExecutable::s_info = { "NativeExecutable", &ExecutableBase::s_info, 0, CREATE_METHOD_TABLE(NativeExecutable) };
+
+void NativeExecutable::destroy(JSCell* cell)
 {
+    static_cast<NativeExecutable*>(cell)->NativeExecutable::~NativeExecutable();
 }
 
-EvalExecutable::~EvalExecutable()
+#if ENABLE(DFG_JIT)
+Intrinsic NativeExecutable::intrinsic() const
 {
-    delete m_evalCodeBlock;
+    return m_intrinsic;
 }
+#endif
 
-ProgramExecutable::~ProgramExecutable()
+const ClassInfo ScriptExecutable::s_info = { "ScriptExecutable", &ExecutableBase::s_info, 0, CREATE_METHOD_TABLE(ScriptExecutable) };
+
+ScriptExecutable::ScriptExecutable(Structure* structure, VM& vm, const SourceCode& source, bool isInStrictContext)
+    : ExecutableBase(vm, structure, NUM_PARAMETERS_NOT_COMPILED)
+    , m_source(source)
+    , m_features(isInStrictContext ? StrictModeFeature : 0)
+    , m_hasCapturedVariables(false)
+    , m_neverInline(false)
+    , m_didTryToEnterInLoop(false)
+    , m_overrideLineNumber(-1)
+    , m_firstLine(-1)
+    , m_lastLine(-1)
+    , m_startColumn(UINT_MAX)
+    , m_endColumn(UINT_MAX)
+    , m_typeProfilingStartOffset(UINT_MAX)
+    , m_typeProfilingEndOffset(UINT_MAX)
 {
-    delete m_programCodeBlock;
 }
 
-FunctionExecutable::~FunctionExecutable()
+void ScriptExecutable::destroy(JSCell* cell)
 {
-    delete m_codeBlock;
+    static_cast<ScriptExecutable*>(cell)->ScriptExecutable::~ScriptExecutable();
 }
 
-JSObject* EvalExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
+void ScriptExecutable::installCode(CodeBlock* genericCodeBlock)
 {
-    int errLine;
-    UString errMsg;
-    RefPtr<EvalNode> evalNode = exec->globalData().parser->parse<EvalNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
-    if (!evalNode)
-        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
-    recordParse(evalNode->features(), evalNode->lineNo(), evalNode->lastLine());
+    RELEASE_ASSERT(genericCodeBlock->ownerExecutable() == this);
+    RELEASE_ASSERT(JITCode::isExecutableScript(genericCodeBlock->jitType()));
+    
+    if (Options::verboseOSR())
+        dataLog("Installing ", *genericCodeBlock, "\n");
+    
+    VM& vm = *genericCodeBlock->vm();
+    
+    if (vm.m_perBytecodeProfiler)
+        vm.m_perBytecodeProfiler->ensureBytecodesFor(genericCodeBlock);
+    
+    ASSERT(vm.heap.isDeferred());
+    
+    CodeSpecializationKind kind = genericCodeBlock->specializationKind();
+    
+    RefPtr<CodeBlock> oldCodeBlock;
+    
+    switch (kind) {
+    case CodeForCall:
+        m_jitCodeForCall = genericCodeBlock->jitCode();
+        m_jitCodeForCallWithArityCheck = MacroAssemblerCodePtr();
+        m_jitCodeForCallWithArityCheckAndPreserveRegs = MacroAssemblerCodePtr();
+        m_numParametersForCall = genericCodeBlock->numParameters();
+        break;
+    case CodeForConstruct:
+        m_jitCodeForConstruct = genericCodeBlock->jitCode();
+        m_jitCodeForConstructWithArityCheck = MacroAssemblerCodePtr();
+        m_jitCodeForConstructWithArityCheckAndPreserveRegs = MacroAssemblerCodePtr();
+        m_numParametersForConstruct = genericCodeBlock->numParameters();
+        break;
+    }
+    
+    switch (genericCodeBlock->codeType()) {
+    case GlobalCode: {
+        ProgramExecutable* executable = jsCast<ProgramExecutable*>(this);
+        ProgramCodeBlock* codeBlock = static_cast<ProgramCodeBlock*>(genericCodeBlock);
+        
+        ASSERT(kind == CodeForCall);
+        
+        oldCodeBlock = executable->m_programCodeBlock;
+        executable->m_programCodeBlock = codeBlock;
+        break;
+    }
+        
+    case EvalCode: {
+        EvalExecutable* executable = jsCast<EvalExecutable*>(this);
+        EvalCodeBlock* codeBlock = static_cast<EvalCodeBlock*>(genericCodeBlock);
+        
+        ASSERT(kind == CodeForCall);
+        
+        oldCodeBlock = executable->m_evalCodeBlock;
+        executable->m_evalCodeBlock = codeBlock;
+        break;
+    }
+        
+    case FunctionCode: {
+        FunctionExecutable* executable = jsCast<FunctionExecutable*>(this);
+        FunctionCodeBlock* codeBlock = static_cast<FunctionCodeBlock*>(genericCodeBlock);
+        
+        switch (kind) {
+        case CodeForCall:
+            oldCodeBlock = executable->m_codeBlockForCall;
+            executable->m_codeBlockForCall = codeBlock;
+            break;
+        case CodeForConstruct:
+            oldCodeBlock = executable->m_codeBlockForConstruct;
+            executable->m_codeBlockForConstruct = codeBlock;
+            break;
+        }
+        break;
+    } }
+
+    if (oldCodeBlock)
+        oldCodeBlock->unlinkIncomingCalls();
+
+    Debugger* debugger = genericCodeBlock->globalObject()->debugger();
+    if (debugger)
+        debugger->registerCodeBlock(genericCodeBlock);
+
+    Heap::heap(this)->writeBarrier(this);
+}
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
+RefPtr<CodeBlock> ScriptExecutable::newCodeBlockFor(
+    CodeSpecializationKind kind, JSFunction* function, JSScope* scope, JSObject*& exception)
+{
+    VM* vm = scope->vm();
+
+    ASSERT(vm->heap.isDeferred());
+    ASSERT(startColumn() != UINT_MAX);
+    ASSERT(endColumn() != UINT_MAX);
+
+    if (classInfo() == EvalExecutable::info()) {
+        EvalExecutable* executable = jsCast<EvalExecutable*>(this);
+        RELEASE_ASSERT(kind == CodeForCall);
+        RELEASE_ASSERT(!executable->m_evalCodeBlock);
+        RELEASE_ASSERT(!function);
+        return adoptRef(new EvalCodeBlock(
+            executable, executable->m_unlinkedEvalCodeBlock.get(), scope,
+            executable->source().provider()));
+    }
+    
+    if (classInfo() == ProgramExecutable::info()) {
+        ProgramExecutable* executable = jsCast<ProgramExecutable*>(this);
+        RELEASE_ASSERT(kind == CodeForCall);
+        RELEASE_ASSERT(!executable->m_programCodeBlock);
+        RELEASE_ASSERT(!function);
+        return adoptRef(new ProgramCodeBlock(
+            executable, executable->m_unlinkedProgramCodeBlock.get(), scope,
+            executable->source().provider(), executable->source().startColumn()));
+    }
+    
+    RELEASE_ASSERT(classInfo() == FunctionExecutable::info());
+    RELEASE_ASSERT(function);
+    FunctionExecutable* executable = jsCast<FunctionExecutable*>(this);
+    RELEASE_ASSERT(!executable->codeBlockFor(kind));
+    JSGlobalObject* globalObject = scope->globalObject();
+    ParserError error;
+    DebuggerMode debuggerMode = globalObject->hasDebugger() ? DebuggerOn : DebuggerOff;
+    ProfilerMode profilerMode = globalObject->hasProfiler() ? ProfilerOn : ProfilerOff;
+    UnlinkedFunctionCodeBlock* unlinkedCodeBlock =
+        executable->m_unlinkedExecutable->codeBlockFor(
+            *vm, executable->m_source, kind, debuggerMode, profilerMode, error);
+    recordParse(executable->m_unlinkedExecutable->features(), executable->m_unlinkedExecutable->hasCapturedVariables(), firstLine(), lastLine(), startColumn(), endColumn()); 
+    if (!unlinkedCodeBlock) {
+        exception = vm->throwException(
+            globalObject->globalExec(),
+            error.toErrorObject(globalObject, executable->m_source));
+        return nullptr;
+    }
 
-    ASSERT(!m_evalCodeBlock);
-    m_evalCodeBlock = new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth());
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(evalNode.get(), globalObject->debugger(), scopeChain, m_evalCodeBlock->symbolTable(), m_evalCodeBlock));
-    generator->generate();
+    // Parsing reveals whether our function uses features that require a separate function name object in the scope chain.
+    // Be sure to add this scope before linking the bytecode because this scope will change the resolution depth of non-local variables.
+    if (functionNameIsInScope(executable->name(), executable->functionMode())
+        && functionNameScopeIsDynamic(executable->usesEval(), executable->isStrictMode())) {
+        // We shouldn't have to do this. But we do, because bytecode linking requires a real scope
+        // chain.
+        // FIXME: https://bugs.webkit.org/show_bug.cgi?id=141885
+        SymbolTable* symbolTable =
+            SymbolTable::createNameScopeTable(*vm, executable->name(), ReadOnly | DontDelete);
+        scope = JSFunctionNameScope::create(
+            *vm, scope->globalObject(), scope, symbolTable, function);
+    }
     
-    evalNode->destroyData();
-    return 0;
+    SourceProvider* provider = executable->source().provider();
+    unsigned sourceOffset = executable->source().startOffset();
+    unsigned startColumn = executable->source().startColumn();
+
+    return adoptRef(new FunctionCodeBlock(
+        executable, unlinkedCodeBlock, scope, provider, sourceOffset, startColumn));
 }
 
-JSObject* ProgramExecutable::checkSyntax(ExecState* exec)
+PassRefPtr<CodeBlock> ScriptExecutable::newReplacementCodeBlockFor(
+    CodeSpecializationKind kind)
 {
-    int errLine;
-    UString errMsg;
-    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
-    if (!programNode)
-        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
-    return 0;
+    if (classInfo() == EvalExecutable::info()) {
+        RELEASE_ASSERT(kind == CodeForCall);
+        EvalExecutable* executable = jsCast<EvalExecutable*>(this);
+        EvalCodeBlock* baseline = static_cast<EvalCodeBlock*>(
+            executable->m_evalCodeBlock->baselineVersion());
+        RefPtr<EvalCodeBlock> result = adoptRef(new EvalCodeBlock(
+            CodeBlock::CopyParsedBlock, *baseline));
+        result->setAlternative(baseline);
+        return result;
+    }
+    
+    if (classInfo() == ProgramExecutable::info()) {
+        RELEASE_ASSERT(kind == CodeForCall);
+        ProgramExecutable* executable = jsCast<ProgramExecutable*>(this);
+        ProgramCodeBlock* baseline = static_cast<ProgramCodeBlock*>(
+            executable->m_programCodeBlock->baselineVersion());
+        RefPtr<ProgramCodeBlock> result = adoptRef(new ProgramCodeBlock(
+            CodeBlock::CopyParsedBlock, *baseline));
+        result->setAlternative(baseline);
+        return result;
+    }
+
+    RELEASE_ASSERT(classInfo() == FunctionExecutable::info());
+    FunctionExecutable* executable = jsCast<FunctionExecutable*>(this);
+    FunctionCodeBlock* baseline = static_cast<FunctionCodeBlock*>(
+        executable->codeBlockFor(kind)->baselineVersion());
+    RefPtr<FunctionCodeBlock> result = adoptRef(new FunctionCodeBlock(
+        CodeBlock::CopyParsedBlock, *baseline));
+    result->setAlternative(baseline);
+    return result;
 }
 
-JSObject* ProgramExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
+static void setupLLInt(VM& vm, CodeBlock* codeBlock)
 {
-    int errLine;
-    UString errMsg;
-    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
-    if (!programNode)
-        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
-    recordParse(programNode->features(), programNode->lineNo(), programNode->lastLine());
+    LLInt::setEntrypoint(vm, codeBlock);
+}
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
-    
-    ASSERT(!m_programCodeBlock);
-    m_programCodeBlock = new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider());
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(programNode.get(), globalObject->debugger(), scopeChain, &globalObject->symbolTable(), m_programCodeBlock));
-    generator->generate();
+static void setupJIT(VM& vm, CodeBlock* codeBlock)
+{
+#if ENABLE(JIT)
+    CompilationResult result = JIT::compile(&vm, codeBlock, JITCompilationMustSucceed);
+    RELEASE_ASSERT(result == CompilationSuccessful);
+#else
+    UNUSED_PARAM(vm);
+    UNUSED_PARAM(codeBlock);
+    UNREACHABLE_FOR_PLATFORM();
+#endif
+}
 
-    programNode->destroyData();
+JSObject* ScriptExecutable::prepareForExecutionImpl(
+    ExecState* exec, JSFunction* function, JSScope* scope, CodeSpecializationKind kind)
+{
+    VM& vm = exec->vm();
+    DeferGC deferGC(vm.heap);
+    
+    JSObject* exception = 0;
+    RefPtr<CodeBlock> codeBlock = newCodeBlockFor(kind, function, scope, exception);
+    if (!codeBlock) {
+        RELEASE_ASSERT(exception);
+        return exception;
+    }
+    
+    if (Options::validateBytecode())
+        codeBlock->validate();
+    
+    if (Options::useLLInt())
+        setupLLInt(vm, codeBlock.get());
+    else
+        setupJIT(vm, codeBlock.get());
+    
+    installCode(codeBlock.get());
     return 0;
 }
 
-void FunctionExecutable::compile(ExecState*, ScopeChainNode* scopeChainNode)
+const ClassInfo EvalExecutable::s_info = { "EvalExecutable", &ScriptExecutable::s_info, 0, CREATE_METHOD_TABLE(EvalExecutable) };
+
+EvalExecutable* EvalExecutable::create(ExecState* exec, const SourceCode& source, bool isInStrictContext, ThisTDZMode thisTDZMode)
 {
-    JSGlobalData* globalData = scopeChainNode->globalData;
-    RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
-    if (m_forceUsesArguments)
-        body->setUsesArguments();
-    body->finishParsing(m_parameters, m_name);
-    recordParse(body->features(), body->lineNo(), body->lastLine());
+    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
+    if (!globalObject->evalEnabled()) {
+        exec->vm().throwException(exec, createEvalError(exec, globalObject->evalDisabledErrorMessage()));
+        return 0;
+    }
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
+    EvalExecutable* executable = new (NotNull, allocateCell<EvalExecutable>(*exec->heap())) EvalExecutable(exec, source, isInStrictContext);
+    executable->finishCreation(exec->vm());
 
-    ASSERT(!m_codeBlock);
-    m_codeBlock = new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset());
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(body.get(), globalObject->debugger(), scopeChain, m_codeBlock->symbolTable(), m_codeBlock));
-    generator->generate();
-    m_numParameters = m_codeBlock->m_numParameters;
-    ASSERT(m_numParameters);
-    m_numVariables = m_codeBlock->m_numVars;
+    UnlinkedEvalCodeBlock* unlinkedEvalCode = globalObject->createEvalCodeBlock(exec, executable, thisTDZMode);
+    if (!unlinkedEvalCode)
+        return 0;
 
-    body->destroyData();
-}
+    executable->m_unlinkedEvalCodeBlock.set(exec->vm(), executable, unlinkedEvalCode);
 
-#if ENABLE(JIT)
+    return executable;
+}
 
-void EvalExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
+EvalExecutable::EvalExecutable(ExecState* exec, const SourceCode& source, bool inStrictContext)
+    : ScriptExecutable(exec->vm().evalExecutableStructure.get(), exec->vm(), source, inStrictContext)
 {
-    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
-    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
-
-#if !ENABLE(OPCODE_SAMPLING)
-    if (!BytecodeGenerator::dumpsGeneratedCode())
-        codeBlock->discardBytecode();
-#endif
 }
 
-void ProgramExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
+void EvalExecutable::destroy(JSCell* cell)
 {
-    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
-    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
+    static_cast<EvalExecutable*>(cell)->EvalExecutable::~EvalExecutable();
+}
 
-#if !ENABLE(OPCODE_SAMPLING)
-    if (!BytecodeGenerator::dumpsGeneratedCode())
-        codeBlock->discardBytecode();
-#endif
+const ClassInfo ProgramExecutable::s_info = { "ProgramExecutable", &ScriptExecutable::s_info, 0, CREATE_METHOD_TABLE(ProgramExecutable) };
+
+ProgramExecutable::ProgramExecutable(ExecState* exec, const SourceCode& source)
+    : ScriptExecutable(exec->vm().programExecutableStructure.get(), exec->vm(), source, false)
+{
+    m_typeProfilingStartOffset = 0;
+    m_typeProfilingEndOffset = source.length() - 1;
+    if (exec->vm().typeProfiler() || exec->vm().controlFlowProfiler())
+        exec->vm().functionHasExecutedCache()->insertUnexecutedRange(sourceID(), m_typeProfilingStartOffset, m_typeProfilingEndOffset);
 }
 
-void FunctionExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
+void ProgramExecutable::destroy(JSCell* cell)
 {
-    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
-    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
+    static_cast<ProgramExecutable*>(cell)->ProgramExecutable::~ProgramExecutable();
+}
 
-#if !ENABLE(OPCODE_SAMPLING)
-    if (!BytecodeGenerator::dumpsGeneratedCode())
-        codeBlock->discardBytecode();
-#endif
+const ClassInfo FunctionExecutable::s_info = { "FunctionExecutable", &ScriptExecutable::s_info, 0, CREATE_METHOD_TABLE(FunctionExecutable) };
+
+FunctionExecutable::FunctionExecutable(VM& vm, const SourceCode& source, 
+    UnlinkedFunctionExecutable* unlinkedExecutable, unsigned firstLine, 
+    unsigned lastLine, unsigned startColumn, unsigned endColumn)
+    : 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;
+    ASSERT(startColumn != UINT_MAX);
+    ASSERT(endColumn != UINT_MAX);
+    m_startColumn = startColumn;
+    m_endColumn = endColumn;
+    m_parametersStartOffset = unlinkedExecutable->parametersStartOffset();
+    m_typeProfilingStartOffset = unlinkedExecutable->typeProfilingStartOffset();
+    m_typeProfilingEndOffset = unlinkedExecutable->typeProfilingEndOffset();
 }
 
-#endif
+void FunctionExecutable::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    m_singletonFunction.set(vm, this, InferredValue::create(vm));
+}
 
-void FunctionExecutable::markAggregate(MarkStack& markStack)
+void FunctionExecutable::destroy(JSCell* cell)
 {
-    if (m_codeBlock)
-        m_codeBlock->markAggregate(markStack);
+    static_cast<FunctionExecutable*>(cell)->FunctionExecutable::~FunctionExecutable();
 }
 
-ExceptionInfo* FunctionExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
+inline const char* samplingDescription(JITCode::JITType jitType)
 {
-    RefPtr<FunctionBodyNode> newFunctionBody = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
-    if (m_forceUsesArguments)
-        newFunctionBody->setUsesArguments();
-    newFunctionBody->finishParsing(m_parameters, m_name);
+    switch (jitType) {
+    case JITCode::InterpreterThunk:
+        return "Interpreter Compilation (TOTAL)";
+    case JITCode::BaselineJIT:
+        return "Baseline Compilation (TOTAL)";
+    case JITCode::DFGJIT:
+        return "DFG Compilation (TOTAL)";
+    case JITCode::FTLJIT:
+        return "FTL Compilation (TOTAL)";
+    default:
+        RELEASE_ASSERT_NOT_REACHED();
+        return 0;
+    }
+}
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
+void EvalExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+    EvalExecutable* thisObject = jsCast<EvalExecutable*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    ScriptExecutable::visitChildren(thisObject, visitor);
+    if (thisObject->m_evalCodeBlock)
+        thisObject->m_evalCodeBlock->visitAggregate(visitor);
+    visitor.append(&thisObject->m_unlinkedEvalCodeBlock);
+}
 
-    OwnPtr<CodeBlock> newCodeBlock(new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset()));
-    globalData->functionCodeBlockBeingReparsed = newCodeBlock.get();
+void EvalExecutable::unlinkCalls()
+{
+#if ENABLE(JIT)
+    if (!m_jitCodeForCall)
+        return;
+    RELEASE_ASSERT(m_evalCodeBlock);
+    m_evalCodeBlock->unlinkCalls();
+#endif
+}
 
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newFunctionBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
-    generator->setRegeneratingForExceptionInfo(static_cast<FunctionCodeBlock*>(codeBlock));
-    generator->generate();
+void EvalExecutable::clearCode()
+{
+    m_evalCodeBlock = nullptr;
+    m_unlinkedEvalCodeBlock.clear();
+    Base::clearCode();
+}
 
-    ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());
+JSObject* ProgramExecutable::checkSyntax(ExecState* exec)
+{
+    ParserError error;
+    VM* vm = &exec->vm();
+    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
+    std::unique_ptr<ProgramNode> programNode = parse<ProgramNode>(
+        vm, m_source, 0, Identifier(), JSParserBuiltinMode::NotBuiltin, 
+        JSParserStrictMode::NotStrict, JSParserCodeType::Program, error);
+    if (programNode)
+        return 0;
+    ASSERT(error.isValid());
+    return error.toErrorObject(lexicalGlobalObject, m_source);
+}
 
+void ProgramExecutable::unlinkCalls()
+{
 #if ENABLE(JIT)
-    JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get());
-    ASSERT(newJITCode.size() == generatedJITCode().size());
+    if (!m_jitCodeForCall)
+        return;
+    RELEASE_ASSERT(m_programCodeBlock);
+    m_programCodeBlock->unlinkCalls();
 #endif
+}
 
-    globalData->functionCodeBlockBeingReparsed = 0;
+JSObject* ProgramExecutable::initializeGlobalProperties(VM& vm, CallFrame* callFrame, JSScope* scope)
+{
+    RELEASE_ASSERT(scope);
+    JSGlobalObject* globalObject = scope->globalObject();
+    RELEASE_ASSERT(globalObject);
+    ASSERT(&globalObject->vm() == &vm);
+
+    JSObject* exception = 0;
+    UnlinkedProgramCodeBlock* unlinkedCodeBlock = globalObject->createProgramCodeBlock(callFrame, this, &exception);
+    if (exception)
+        return exception;
+
+    m_unlinkedProgramCodeBlock.set(vm, this, unlinkedCodeBlock);
+
+    BatchedTransitionOptimizer optimizer(vm, globalObject);
+
+    const UnlinkedProgramCodeBlock::VariableDeclations& variableDeclarations = unlinkedCodeBlock->variableDeclarations();
+
+    for (size_t i = 0, numberOfFunctions = unlinkedCodeBlock->numberOfFunctionDecls(); i < numberOfFunctions; ++i) {
+        UnlinkedFunctionExecutable* unlinkedFunctionExecutable = unlinkedCodeBlock->functionDecl(i);
+        ASSERT(!unlinkedFunctionExecutable->name().isEmpty());
+        globalObject->addFunction(callFrame, unlinkedFunctionExecutable->name());
+        if (vm.typeProfiler() || vm.controlFlowProfiler()) {
+            vm.functionHasExecutedCache()->insertUnexecutedRange(sourceID(), 
+                unlinkedFunctionExecutable->typeProfilingStartOffset(), 
+                unlinkedFunctionExecutable->typeProfilingEndOffset());
+        }
+    }
 
-    return newCodeBlock->extractExceptionInfo();
+    for (size_t i = 0; i < variableDeclarations.size(); ++i) {
+        if (variableDeclarations[i].second & DeclarationStacks::IsConstant)
+            globalObject->addConst(callFrame, variableDeclarations[i].first);
+        else
+            globalObject->addVar(callFrame, variableDeclarations[i].first);
+    }
+    return 0;
 }
 
-ExceptionInfo* EvalExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
+void ProgramExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
 {
-    RefPtr<EvalNode> newEvalBody = globalData->parser->parse<EvalNode>(globalData, 0, 0, m_source);
+    ProgramExecutable* thisObject = jsCast<ProgramExecutable*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    ScriptExecutable::visitChildren(thisObject, visitor);
+    visitor.append(&thisObject->m_unlinkedProgramCodeBlock);
+    if (thisObject->m_programCodeBlock)
+        thisObject->m_programCodeBlock->visitAggregate(visitor);
+}
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
+void ProgramExecutable::clearCode()
+{
+    m_programCodeBlock = nullptr;
+    m_unlinkedProgramCodeBlock.clear();
+    Base::clearCode();
+}
 
-    OwnPtr<EvalCodeBlock> newCodeBlock(new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth()));
+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;
+    return static_cast<FunctionCodeBlock*>(result->baselineAlternative());
+}
 
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newEvalBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
-    generator->setRegeneratingForExceptionInfo(static_cast<EvalCodeBlock*>(codeBlock));
-    generator->generate();
+void FunctionExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+    FunctionExecutable* thisObject = jsCast<FunctionExecutable*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    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);
+    visitor.append(&thisObject->m_singletonFunction);
+}
 
-    ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());
+SymbolTable* FunctionExecutable::symbolTable(CodeSpecializationKind kind)
+{
+    return codeBlockFor(kind)->symbolTable();
+}
 
-#if ENABLE(JIT)
-    JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get());
-    ASSERT(newJITCode.size() == generatedJITCode().size());
-#endif
+void FunctionExecutable::clearUnlinkedCodeForRecompilation()
+{
+    m_unlinkedExecutable->clearCodeForRecompilation();
+}
 
-    return newCodeBlock->extractExceptionInfo();
+void FunctionExecutable::clearCode()
+{
+    m_codeBlockForCall = nullptr;
+    m_codeBlockForConstruct = nullptr;
+    Base::clearCode();
 }
 
-void FunctionExecutable::recompile(ExecState*)
+void FunctionExecutable::unlinkCalls()
 {
-    delete m_codeBlock;
-    m_codeBlock = 0;
-    m_numParameters = NUM_PARAMETERS_NOT_COMPILED;
 #if ENABLE(JIT)
-    m_jitCode = JITCode();
+    if (!!m_jitCodeForCall) {
+        RELEASE_ASSERT(m_codeBlockForCall);
+        m_codeBlockForCall->unlinkCalls();
+    }
+    if (!!m_jitCodeForConstruct) {
+        RELEASE_ASSERT(m_codeBlockForConstruct);
+        m_codeBlockForConstruct->unlinkCalls();
+    }
 #endif
 }
 
-PassRefPtr<FunctionExecutable> FunctionExecutable::fromGlobalCode(const Identifier& functionName, ExecState* exec, Debugger* debugger, const SourceCode& source, int* errLine, UString* errMsg)
+FunctionExecutable* FunctionExecutable::fromGlobalCode(
+    const Identifier& name, ExecState& exec, const SourceCode& source, 
+    JSObject*& exception, int overrideLineNumber)
 {
-    RefPtr<ProgramNode> program = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), debugger, exec, source, errLine, errMsg);
-    if (!program)
-        return 0;
-
-    StatementNode* exprStatement = program->singleStatement();
-    ASSERT(exprStatement);
-    ASSERT(exprStatement->isExprStatement());
-    if (!exprStatement || !exprStatement->isExprStatement())
-        return 0;
-
-    ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
-    ASSERT(funcExpr);
-    ASSERT(funcExpr->isFuncExprNode());
-    if (!funcExpr || !funcExpr->isFuncExprNode())
-        return 0;
+    UnlinkedFunctionExecutable* unlinkedExecutable = 
+        UnlinkedFunctionExecutable::fromGlobalCode(
+            name, exec, source, exception, overrideLineNumber);
+    if (!unlinkedExecutable)
+        return nullptr;
 
-    FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
-    ASSERT(body);
-    return FunctionExecutable::create(&exec->globalData(), functionName, body->source(), body->usesArguments(), body->parameters(), body->lineNo(), body->lastLine());
+    return unlinkedExecutable->link(exec.vm(), source, overrideLineNumber);
 }
 
-UString FunctionExecutable::paramString() const
+void ExecutableBase::dump(PrintStream& out) const
 {
-    FunctionParameters& parameters = *m_parameters;
-    StringBuilder builder;
-    for (size_t pos = 0; pos < parameters.size(); ++pos) {
-        if (!builder.isEmpty())
-            builder.append(", ");
-        builder.append(parameters[pos].ustring());
+    ExecutableBase* realThis = const_cast<ExecutableBase*>(this);
+    
+    if (classInfo() == NativeExecutable::info()) {
+        NativeExecutable* native = jsCast<NativeExecutable*>(realThis);
+        out.print("NativeExecutable:", RawPointer(bitwise_cast<void*>(native->function())), "/", RawPointer(bitwise_cast<void*>(native->constructor())));
+        return;
     }
-    return builder.release();
+    
+    if (classInfo() == EvalExecutable::info()) {
+        EvalExecutable* eval = jsCast<EvalExecutable*>(realThis);
+        if (CodeBlock* codeBlock = eval->codeBlock())
+            out.print(*codeBlock);
+        else
+            out.print("EvalExecutable w/o CodeBlock");
+        return;
+    }
+    
+    if (classInfo() == ProgramExecutable::info()) {
+        ProgramExecutable* eval = jsCast<ProgramExecutable*>(realThis);
+        if (CodeBlock* codeBlock = eval->codeBlock())
+            out.print(*codeBlock);
+        else
+            out.print("ProgramExecutable w/o CodeBlock");
+        return;
+    }
+    
+    FunctionExecutable* function = jsCast<FunctionExecutable*>(realThis);
+    if (!function->eitherCodeBlock())
+        out.print("FunctionExecutable w/o CodeBlock");
+    else {
+        CommaPrinter comma("/");
+        if (function->codeBlockForCall())
+            out.print(comma, *function->codeBlockForCall());
+        if (function->codeBlockForConstruct())
+            out.print(comma, *function->codeBlockForConstruct());
+    }
+}
+
+CodeBlockHash ExecutableBase::hashFor(CodeSpecializationKind kind) const
+{
+    if (this->classInfo() == NativeExecutable::info())
+        return jsCast<const NativeExecutable*>(this)->hashFor(kind);
+    
+    return jsCast<const ScriptExecutable*>(this)->hashFor(kind);
 }
 
-};
+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)));
+}
 
+CodeBlockHash ScriptExecutable::hashFor(CodeSpecializationKind kind) const
+{
+    return CodeBlockHash(source(), kind);
+}
 
+}