C++ FunctionExecutable类代码示例

PassRefPtr<CodeBlock> ScriptExecutable::newReplacementCodeBlockFor(
    CodeSpecializationKind kind)
{
    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;
}

bool ClonedArguments::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName ident, PropertySlot& slot)
{
    ClonedArguments* thisObject = jsCast<ClonedArguments*>(object);
    VM& vm = exec->vm();

    if (!thisObject->specialsMaterialized()) {
        FunctionExecutable* executable = jsCast<FunctionExecutable*>(thisObject->m_callee->executable());
        bool isStrictMode = executable->isStrictMode();

        if (ident == vm.propertyNames->callee) {
            if (isStrictMode) {
                slot.setGetterSlot(thisObject, DontDelete | DontEnum | Accessor, thisObject->globalObject()->throwTypeErrorArgumentsCalleeAndCallerGetterSetter());
                return true;
            }
            slot.setValue(thisObject, 0, thisObject->m_callee.get());
            return true;
        }

        if (ident == vm.propertyNames->iteratorSymbol) {
            slot.setValue(thisObject, DontEnum, thisObject->globalObject()->arrayProtoValuesFunction());
            return true;
        }
    }

    return Base::getOwnPropertySlot(thisObject, exec, ident, slot);
}

EncodedJSValue JSC_HOST_CALL functionProtoFuncToString(ExecState* exec)
{
    JSValue thisValue = exec->thisValue();
    if (thisValue.inherits(JSFunction::info())) {
        JSFunction* function = jsCast<JSFunction*>(thisValue);
        if (function->isHostOrBuiltinFunction()) {
            String name;
            if (JSBoundFunction* boundFunction = jsDynamicCast<JSBoundFunction*>(function))
                name = boundFunction->toStringName(exec);
            else
                name = function->name(exec);
            return JSValue::encode(jsMakeNontrivialString(exec, "function ", name, "() {\n    [native code]\n}"));
        }

        FunctionExecutable* executable = function->jsExecutable();
        
        String functionHeader = executable->isArrowFunction() ? "" : "function ";
        
        StringView source = executable->source().provider()->getRange(
            executable->parametersStartOffset(),
            executable->parametersStartOffset() + executable->source().length());
        return JSValue::encode(jsMakeNontrivialString(exec, functionHeader, function->name(exec), source));
    }

    if (thisValue.inherits(InternalFunction::info())) {
        InternalFunction* function = asInternalFunction(thisValue);
        return JSValue::encode(jsMakeNontrivialString(exec, "function ", function->name(exec), "() {\n    [native code]\n}"));
    }

    return throwVMTypeError(exec);
}

 void operator()(JSCell* cell)
 {
     if (!cell->inherits(&FunctionExecutable::s_info))
         return;
     FunctionExecutable* executable = static_cast<FunctionExecutable*>(cell);
     if (currentlyExecutingFunctions.contains(executable))
         return;
     executable->discardCode();
 }

    inline void operator()(JSCell* cell)
    {
        if (!cell->inherits(FunctionExecutable::info()))
            return;

        FunctionExecutable* executable = jsCast<FunctionExecutable*>(cell);
        executable->clearCodeIfNotCompiling();
        executable->clearUnlinkedCodeForRecompilationIfNotCompiling();
    }

    inline void visit(JSCell* cell)
    {
        if (!cell->inherits(FunctionExecutable::info()))
            return;

        FunctionExecutable* executable = jsCast<FunctionExecutable*>(cell);
        executable->clearCode();
        executable->clearUnlinkedCodeForRecompilation();
    }

void Heap::discardAllCompiledCode()
{
    // If JavaScript is running, it's not safe to recompile, since we'll end
    // up throwing away code that is live on the stack.
    if (m_globalData->dynamicGlobalObject)
        return;

    for (FunctionExecutable* current = m_functions.head(); current; current = current->next())
        current->discardCode();
}

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, executable->isArrowFunction());
    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;
    }

    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));
}

CodeBlock* getSomeBaselineCodeBlockForFunction(JSValue theFunctionValue)
{
    FunctionExecutable* executable = getExecutableForFunction(theFunctionValue);
    if (!executable)
        return 0;
    
    CodeBlock* baselineCodeBlock = executable->baselineCodeBlockFor(CodeForCall);
    
    if (!baselineCodeBlock)
        baselineCodeBlock = executable->baselineCodeBlockFor(CodeForConstruct);
    
    return baselineCodeBlock;
}

void FunctionExecutable::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
    FunctionExecutable* thisObject = jsCast<FunctionExecutable*>(cell);
    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
    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);
}

JSCell* DFG_OPERATION operationNewFunctionExpression(ExecState* exec, JSCell* functionExecutableAsCell)
{
    ASSERT(functionExecutableAsCell->inherits(&FunctionExecutable::s_info));
    FunctionExecutable* functionExecutable =
        static_cast<FunctionExecutable*>(functionExecutableAsCell);
    JSFunction *function = functionExecutable->make(exec, exec->scopeChain());
    if (!functionExecutable->name().isNull()) {
        JSStaticScopeObject* functionScopeObject =
            JSStaticScopeObject::create(
                exec, functionExecutable->name(), function, ReadOnly | DontDelete);
        function->setScope(exec->globalData(), function->scope()->push(functionScopeObject));
    }
    return function;
}

void ClonedArguments::materializeSpecials(ExecState* exec)
{
    RELEASE_ASSERT(!specialsMaterialized());
    VM& vm = exec->vm();
    
    FunctionExecutable* executable = jsCast<FunctionExecutable*>(m_callee->executable());
    bool isStrictMode = executable->isStrictMode();
    
    if (isStrictMode)
        putDirectAccessor(exec, vm.propertyNames->callee, globalObject()->throwTypeErrorArgumentsCalleeAndCallerGetterSetter(), DontDelete | DontEnum | Accessor);
    else
        putDirect(vm, vm.propertyNames->callee, JSValue(m_callee.get()));

    putDirect(vm, vm.propertyNames->iteratorSymbol, globalObject()->arrayProtoValuesFunction(), DontEnum);
    
    m_callee.clear();
}

CodeBlock* ScriptExecutable::newReplacementCodeBlockFor(
    CodeSpecializationKind kind)
{
    if (classInfo() == EvalExecutable::info()) {
        RELEASE_ASSERT(kind == CodeForCall);
        EvalExecutable* executable = jsCast<EvalExecutable*>(this);
        EvalCodeBlock* baseline = static_cast<EvalCodeBlock*>(
            executable->m_evalCodeBlock->baselineVersion());
        EvalCodeBlock* result = EvalCodeBlock::create(vm(),
            CodeBlock::CopyParsedBlock, *baseline);
        result->setAlternative(*vm(), 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());
        ProgramCodeBlock* result = ProgramCodeBlock::create(vm(),
            CodeBlock::CopyParsedBlock, *baseline);
        result->setAlternative(*vm(), baseline);
        return result;
    }

    if (classInfo() == ModuleProgramExecutable::info()) {
        RELEASE_ASSERT(kind == CodeForCall);
        ModuleProgramExecutable* executable = jsCast<ModuleProgramExecutable*>(this);
        ModuleProgramCodeBlock* baseline = static_cast<ModuleProgramCodeBlock*>(
            executable->m_moduleProgramCodeBlock->baselineVersion());
        ModuleProgramCodeBlock* result = ModuleProgramCodeBlock::create(vm(),
            CodeBlock::CopyParsedBlock, *baseline);
        result->setAlternative(*vm(), baseline);
        return result;
    }

    RELEASE_ASSERT(classInfo() == FunctionExecutable::info());
    FunctionExecutable* executable = jsCast<FunctionExecutable*>(this);
    FunctionCodeBlock* baseline = static_cast<FunctionCodeBlock*>(
        executable->codeBlockFor(kind)->baselineVersion());
    FunctionCodeBlock* result = FunctionCodeBlock::create(vm(),
        CodeBlock::CopyParsedBlock, *baseline);
    result->setAlternative(*vm(), baseline);
    return result;
}

FunctionExecutable* UnlinkedFunctionExecutable::link(VM& vm, const SourceCode& ownerSource, int overrideLineNumber)
{
    SourceCode source = m_sourceOverride ? SourceCode(m_sourceOverride) : ownerSource;
    unsigned firstLine = source.firstLine() + m_firstLineOffset;
    unsigned startOffset = source.startOffset() + m_startOffset;

    // Adjust to one-based indexing.
    bool startColumnIsOnFirstSourceLine = !m_firstLineOffset;
    unsigned startColumn = m_unlinkedBodyStartColumn + (startColumnIsOnFirstSourceLine ? source.startColumn() : 1);
    bool endColumnIsOnStartLine = !m_lineCount;
    unsigned endColumn = m_unlinkedBodyEndColumn + (endColumnIsOnStartLine ? startColumn : 1);

    SourceCode code(source.provider(), startOffset, startOffset + m_sourceLength, firstLine, startColumn);
    FunctionExecutable* result = FunctionExecutable::create(vm, code, this, firstLine, firstLine + m_lineCount, startColumn, endColumn);
    if (overrideLineNumber != -1)
        result->setOverrideLineNumber(overrideLineNumber);
    return result;
}

void prepareCodeOriginForOSRExit(ExecState* exec, CodeOrigin codeOrigin)
{
    VM& vm = exec->vm();
    DeferGC deferGC(vm.heap);
    
    for (; codeOrigin.inlineCallFrame; codeOrigin = codeOrigin.inlineCallFrame->caller) {
        FunctionExecutable* executable =
            static_cast<FunctionExecutable*>(codeOrigin.inlineCallFrame->executable.get());
        CodeBlock* codeBlock = executable->baselineCodeBlockFor(
            codeOrigin.inlineCallFrame->specializationKind());
        
        if (codeBlock->jitType() == JSC::JITCode::BaselineJIT)
            continue;
        ASSERT(codeBlock->jitType() == JSC::JITCode::InterpreterThunk);
        JIT::compile(&vm, codeBlock, JITCompilationMustSucceed);
        codeBlock->install();
    }
}