C++ ScriptValue::hasNoValue方法代码示例

void InjectedScriptModule::ensureInjected(InjectedScriptManager* injectedScriptManager, InjectedScript injectedScript)
{
    ASSERT(!injectedScript.hasNoValue());
    if (injectedScript.hasNoValue())
        return;

    // FIXME: Make the InjectedScript a module itself.
    JSC::APIEntryShim entryShim(injectedScript.scriptState());
    Deprecated::ScriptFunctionCall function(injectedScript.injectedScriptObject(), ASCIILiteral("module"), injectedScriptManager->inspectorEnvironment().functionCallHandler());
    function.appendArgument(name());
    bool hadException = false;
    Deprecated::ScriptValue resultValue = injectedScript.callFunctionWithEvalEnabled(function, hadException);
    ASSERT(!hadException);
    if (hadException || resultValue.hasNoValue() || !resultValue.isObject()) {
        Deprecated::ScriptFunctionCall function(injectedScript.injectedScriptObject(), ASCIILiteral("injectModule"), injectedScriptManager->inspectorEnvironment().functionCallHandler());
        function.appendArgument(name());
        function.appendArgument(source());
        function.appendArgument(host(injectedScriptManager, injectedScript.scriptState()));
        resultValue = injectedScript.callFunctionWithEvalEnabled(function, hadException);
        if (hadException || (returnsObject() && (resultValue.hasNoValue() || !resultValue.isObject()))) {
            ASSERT_NOT_REACHED();
            return;
        }
    }

    if (returnsObject()) {
        Deprecated::ScriptObject moduleObject(injectedScript.scriptState(), resultValue);
        initialize(moduleObject, &injectedScriptManager->inspectorEnvironment());
    }
}

void InjectedScriptModule::ensureInjected(InjectedScriptManager* injectedScriptManager, InjectedScript injectedScript)
{
    ASSERT(!injectedScript.hasNoValue());
    if (injectedScript.hasNoValue())
        return;

    // FIXME: Make the InjectedScript a module itself.
    Deprecated::ScriptFunctionCall function(injectedScript.injectedScriptObject(), "module", WebCore::functionCallHandlerFromAnyThread);
    function.appendArgument(name());
    bool hadException = false;
    Deprecated::ScriptValue resultValue = injectedScript.callFunctionWithEvalEnabled(function, hadException);
    ASSERT(!hadException);
    if (hadException || resultValue.hasNoValue() || !resultValue.isObject()) {
        Deprecated::ScriptFunctionCall function(injectedScript.injectedScriptObject(), "injectModule", WebCore::functionCallHandlerFromAnyThread);
        function.appendArgument(name());
        function.appendArgument(source());
        function.appendArgument(host(injectedScriptManager, injectedScript.scriptState()));
        resultValue = injectedScript.callFunctionWithEvalEnabled(function, hadException);
        if (hadException || (returnsObject() && (resultValue.hasNoValue() || !resultValue.isObject()))) {
            ASSERT_NOT_REACHED();
            return;
        }
    }

    if (returnsObject()) {
        Deprecated::ScriptObject moduleObject(injectedScript.scriptState(), resultValue);
        initialize(moduleObject, injectedScriptManager->inspectedStateAccessCheck());
    }
}

RefPtr<InspectorObject> InspectorDebuggerAgent::buildExceptionPauseReason(const Deprecated::ScriptValue& exception, const InjectedScript& injectedScript)
{
    ASSERT(!exception.hasNoValue());
    if (exception.hasNoValue())
        return nullptr;

    ASSERT(!injectedScript.hasNoValue());
    if (injectedScript.hasNoValue())
        return nullptr;

    return injectedScript.wrapObject(exception, InspectorDebuggerAgent::backtraceObjectGroup)->openAccessors();
}

void InspectorDebuggerAgent::didPause(JSC::ExecState* scriptState, const Deprecated::ScriptValue& callFrames, const Deprecated::ScriptValue& exception)
{
    ASSERT(scriptState && !m_pausedScriptState);
    m_pausedScriptState = scriptState;
    m_currentCallStack = callFrames;

    if (!exception.hasNoValue()) {
        InjectedScript injectedScript = m_injectedScriptManager->injectedScriptFor(scriptState);
        if (!injectedScript.hasNoValue()) {
            m_breakReason = InspectorDebuggerFrontendDispatcher::Reason::Exception;
            m_breakAuxData = injectedScript.wrapObject(exception, InspectorDebuggerAgent::backtraceObjectGroup)->openAccessors();
            // m_breakAuxData might be null after this.
        }
    }

    m_frontendDispatcher->paused(currentCallFrames(), m_breakReason, m_breakAuxData);
    m_javaScriptPauseScheduled = false;

    if (m_continueToLocationBreakpointID != JSC::noBreakpointID) {
        scriptDebugServer().removeBreakpoint(m_continueToLocationBreakpointID);
        m_continueToLocationBreakpointID = JSC::noBreakpointID;
    }

    if (m_listener)
        m_listener->didPause();
}

Deprecated::ScriptObject InjectedScriptCanvasModule::callWrapContextFunction(const String& functionName, const Deprecated::ScriptObject& context)
{
    Deprecated::ScriptFunctionCall function(injectedScriptObject(), functionName, WebCore::functionCallHandlerFromAnyThread);
    function.appendArgument(context);
    bool hadException = false;
    Deprecated::ScriptValue resultValue = callFunctionWithEvalEnabled(function, hadException);
    if (hadException || resultValue.hasNoValue() || !resultValue.isObject()) {
        ASSERT_NOT_REACHED();
        return Deprecated::ScriptObject();
    }
    return Deprecated::ScriptObject(context.scriptState(), resultValue);
}

JSValue JSCommandLineAPIHost::inspectedObject(ExecState* exec)
{
    CommandLineAPIHost::InspectableObject* object = impl().inspectedObject();
    if (!object)
        return jsUndefined();

    JSLockHolder lock(exec);
    Deprecated::ScriptValue scriptValue = object->get(exec);
    if (scriptValue.hasNoValue())
        return jsUndefined();

    return scriptValue.jsValue();
}

void InspectorHeapProfilerAgent::getHeapObjectId(ErrorString* errorString, const String& objectId, String* heapSnapshotObjectId)
{
    InjectedScript injectedScript = m_injectedScriptManager->injectedScriptForObjectId(objectId);
    if (injectedScript.hasNoValue()) {
        *errorString = "Inspected context has gone";
        return;
    }
    Deprecated::ScriptValue value = injectedScript.findObjectById(objectId);
    if (value.hasNoValue() || value.isUndefined()) {
        *errorString = "Object with given id not found";
        return;
    }
    unsigned id = ScriptProfiler::getHeapObjectId(value);
    *heapSnapshotObjectId = String::number(id);
}

JSValue JSCommandLineAPIHost::inspectedObject(ExecState* exec)
{
    if (exec->argumentCount() < 1)
        return jsUndefined();

    CommandLineAPIHost::InspectableObject* object = impl().inspectedObject(exec->uncheckedArgument(0).toInt32(exec));
    if (!object)
        return jsUndefined();

    JSLockHolder lock(exec);
    Deprecated::ScriptValue scriptValue = object->get(exec);
    if (scriptValue.hasNoValue())
        return jsUndefined();

    return scriptValue.jsValue();
}

PassRefPtr<Inspector::TypeBuilder::Runtime::RemoteObject> InjectedScript::wrapTable(const Deprecated::ScriptValue& table, const Deprecated::ScriptValue& columns) const
{
    ASSERT(!hasNoValue());
    Deprecated::ScriptFunctionCall wrapFunction(injectedScriptObject(), ASCIILiteral("wrapTable"), inspectorEnvironment()->functionCallHandler());
    wrapFunction.appendArgument(hasAccessToInspectedScriptState());
    wrapFunction.appendArgument(table);
    if (columns.hasNoValue())
        wrapFunction.appendArgument(false);
    else
        wrapFunction.appendArgument(columns);

    bool hadException = false;
    Deprecated::ScriptValue r = callFunctionWithEvalEnabled(wrapFunction, hadException);
    if (hadException)
        return nullptr;

    RefPtr<InspectorObject> rawResult = r.toInspectorValue(scriptState())->asObject();
    return Inspector::TypeBuilder::Runtime::RemoteObject::runtimeCast(rawResult);
}

JSValue JSMessageEvent::data(ExecState* exec) const
{
    if (JSValue cachedValue = m_data.get())
        return cachedValue;

    MessageEvent& event = impl();
    JSValue result;
    switch (event.dataType()) {
    case MessageEvent::DataTypeScriptValue: {
        Deprecated::ScriptValue scriptValue = event.dataAsScriptValue();
        if (scriptValue.hasNoValue())
            result = jsNull();
        else
            result = scriptValue.jsValue();
        break;
    }

    case MessageEvent::DataTypeSerializedScriptValue:
        if (RefPtr<SerializedScriptValue> serializedValue = event.dataAsSerializedScriptValue()) {
            MessagePortArray ports = impl().ports();
            // FIXME: Why does this suppress exceptions?
            result = serializedValue->deserialize(exec, globalObject(), &ports, NonThrowing);
        } else
            result = jsNull();
        break;

    case MessageEvent::DataTypeString:
        result = jsStringWithCache(exec, event.dataAsString());
        break;

    case MessageEvent::DataTypeBlob:
        result = toJS(exec, globalObject(), event.dataAsBlob());
        break;

    case MessageEvent::DataTypeArrayBuffer:
        result = toJS(exec, globalObject(), event.dataAsArrayBuffer());
        break;
    }

    // Save the result so we don't have to deserialize the value again.
    const_cast<JSMessageEvent*>(this)->m_data.set(exec->vm(), this, result);
    return result;
}

void WorkerGlobalScope::importScripts(const Vector<String>& urls, ExceptionCode& ec)
{
    ASSERT(contentSecurityPolicy());
    ec = 0;
    Vector<String>::const_iterator urlsEnd = urls.end();
    Vector<URL> completedURLs;
    for (Vector<String>::const_iterator it = urls.begin(); it != urlsEnd; ++it) {
        const URL& url = scriptExecutionContext()->completeURL(*it);
        if (!url.isValid()) {
            ec = SYNTAX_ERR;
            return;
        }
        completedURLs.append(url);
    }
    Vector<URL>::const_iterator end = completedURLs.end();

    for (Vector<URL>::const_iterator it = completedURLs.begin(); it != end; ++it) {
        Ref<WorkerScriptLoader> scriptLoader = WorkerScriptLoader::create();
        scriptLoader->loadSynchronously(scriptExecutionContext(), *it, AllowCrossOriginRequests);

        // If the fetching attempt failed, throw a NETWORK_ERR exception and abort all these steps.
        if (scriptLoader->failed()) {
            ec = XMLHttpRequestException::NETWORK_ERR;
            return;
        }

        InspectorInstrumentation::scriptImported(scriptExecutionContext(), scriptLoader->identifier(), scriptLoader->script());

        Deprecated::ScriptValue exception;
        m_script->evaluate(ScriptSourceCode(scriptLoader->script(), scriptLoader->responseURL()), &exception);
        if (!exception.hasNoValue()) {
            m_script->setException(exception);
            return;
        }
    }
}

void InspectorDebuggerAgent::didPause(JSC::ExecState* scriptState, const Deprecated::ScriptValue& callFrames, const Deprecated::ScriptValue& exceptionOrCaughtValue)
{
    ASSERT(scriptState && !m_pausedScriptState);
    m_pausedScriptState = scriptState;
    m_currentCallStack = callFrames;

    InjectedScript injectedScript = m_injectedScriptManager->injectedScriptFor(scriptState);

    // If a high level pause pause reason is not already set, try to infer a reason from the debugger.
    if (m_breakReason == DebuggerFrontendDispatcher::Reason::Other) {
        switch (scriptDebugServer().reasonForPause()) {
        case JSC::Debugger::PausedForBreakpoint: {
            JSC::BreakpointID debuggerBreakpointId = scriptDebugServer().pausingBreakpointID();
            if (debuggerBreakpointId != m_continueToLocationBreakpointID) {
                m_breakReason = DebuggerFrontendDispatcher::Reason::Breakpoint;
                m_breakAuxData = buildBreakpointPauseReason(debuggerBreakpointId);
            }
            break;
        }
        case JSC::Debugger::PausedForDebuggerStatement:
            m_breakReason = DebuggerFrontendDispatcher::Reason::DebuggerStatement;
            m_breakAuxData = nullptr;
            break;
        case JSC::Debugger::PausedForException:
            m_breakReason = DebuggerFrontendDispatcher::Reason::Exception;
            m_breakAuxData = buildExceptionPauseReason(exceptionOrCaughtValue, injectedScript);
            break;
        case JSC::Debugger::PausedAtStatement:
        case JSC::Debugger::PausedAfterCall:
        case JSC::Debugger::PausedBeforeReturn:
        case JSC::Debugger::PausedAtStartOfProgram:
        case JSC::Debugger::PausedAtEndOfProgram:
            // Pause was just stepping. Nothing to report.
            break;
        case JSC::Debugger::NotPaused:
            ASSERT_NOT_REACHED();
            break;
        }
    }

    // Set $exception to the exception or caught value.
    if (!exceptionOrCaughtValue.hasNoValue() && !injectedScript.hasNoValue()) {
        injectedScript.setExceptionValue(exceptionOrCaughtValue);
        m_hasExceptionValue = true;
    }

    m_frontendDispatcher->paused(currentCallFrames(injectedScript), m_breakReason, m_breakAuxData);
    m_javaScriptPauseScheduled = false;

    if (m_continueToLocationBreakpointID != JSC::noBreakpointID) {
        scriptDebugServer().removeBreakpoint(m_continueToLocationBreakpointID);
        m_continueToLocationBreakpointID = JSC::noBreakpointID;
    }

    if (m_listener)
        m_listener->didPause();

    RefPtr<Stopwatch> stopwatch = m_injectedScriptManager->inspectorEnvironment().executionStopwatch();
    if (stopwatch && stopwatch->isActive()) {
        stopwatch->stop();
        m_didPauseStopwatch = true;
    }
}