C++ JSGlobalObject类代码示例

bool JSCustomSQLStatementErrorCallback::handleEvent(SQLTransaction* transaction, SQLError* error)
{
    ASSERT(m_callback);
    ASSERT(m_frame);
        
    if (!m_frame->script()->isEnabled())
        return true;
        
    JSGlobalObject* globalObject = m_frame->script()->globalObject();
    ExecState* exec = globalObject->globalExec();
        
    KJS::JSLock lock;
        
    JSValue* handleEventFunction = m_callback->get(exec, Identifier(exec, "handleEvent"));
    CallData handleEventCallData;
    CallType handleEventCallType = handleEventFunction->getCallData(handleEventCallData);
    CallData callbackCallData;
    CallType callbackCallType = CallTypeNone;

    if (handleEventCallType == CallTypeNone) {
        callbackCallType = m_callback->getCallData(callbackCallData);
        if (callbackCallType == CallTypeNone) {
            // FIXME: Should an exception be thrown here?
            return true;
        }
    }
        
    RefPtr<JSCustomSQLStatementErrorCallback> protect(this);
        
    ArgList args;
    args.append(toJS(exec, transaction));
    args.append(toJS(exec, error));
        
    JSValue* result;
    globalObject->startTimeoutCheck();
    if (handleEventCallType != CallTypeNone)
        result = call(exec, handleEventFunction, handleEventCallType, handleEventCallData, m_callback, args);
    else
        result = call(exec, m_callback, callbackCallType, callbackCallData, m_callback, args);
    globalObject->stopTimeoutCheck();
        
    if (exec->hadException()) {
        JSObject* exception = exec->exception()->toObject(exec);
        String message = exception->get(exec, exec->propertyNames().message)->toString(exec);
        int lineNumber = exception->get(exec, Identifier(exec, "line"))->toInt32(exec);
        String sourceURL = exception->get(exec, Identifier(exec, "sourceURL"))->toString(exec);
        m_frame->domWindow()->console()->addMessage(JSMessageSource, ErrorMessageLevel, message, lineNumber, sourceURL);
        exec->clearException();
            
        // The spec says:
        // "If the error callback returns false, then move on to the next statement..."
        // "Otherwise, the error callback did not return false, or there was no error callback"
        // Therefore an exception and returning true are the same thing - so, return true on an exception
        return true;
    }
        
    Document::updateDocumentsRendering();

    return result->toBoolean(exec);
}

PassRefPtr<FunctionCodeBlock> FunctionExecutable::produceCodeBlockFor(JSScope* scope, CodeSpecializationKind specializationKind, JSObject*& exception)
{
    RefPtr<FunctionCodeBlock> alternative = codeBlockFor(specializationKind);
    
    if (!!alternative) {
        RefPtr<FunctionCodeBlock> result = adoptRef(new FunctionCodeBlock(CodeBlock::CopyParsedBlock, *codeBlockFor(specializationKind)));
        result->setAlternative(alternative);
        return result.release();
    }

    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, 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 0;
    }

    SourceProvider* provider = source().provider();
    unsigned sourceOffset = source().startOffset();
    unsigned startColumn = source().startColumn();

    return adoptRef(new FunctionCodeBlock(this, unlinkedCodeBlock, scope, provider, sourceOffset, startColumn));
}

JSBool JSJSGlobalObject::fromjs_isTimerValid(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) {
  // get instance
  JSGlobalObject *object = static_cast<JSGlobalObject *>(reinterpret_cast<JSScriptable *>(JS_GetPrivate(cx, obj)));
  if (!object) {
    JSScriptable::js_throwNullCallException(JSJSGlobalObject::classDescriptor.name, JSJSGlobalObject::functionTable[4].name);
    return JS_FALSE;
  }
  // record context
  object->js_setCurrentContext(cx);
  // JSTimer *timer
  JSObject *p0;
  if (!JS_ValueToObject(cx, argv[0], &p0))
    return JS_FALSE;
  argv[0] = OBJECT_TO_JSVAL(p0);
  JSTimer *p0o = NULL;
  if (p0) {
    JSScriptable *pobj = reinterpret_cast<JSScriptable*>(JS_GetPrivate(cx, p0));
    if (!pobj) {
      object->js_throwNullParamException(0, JSJSGlobalObject::functionTable[4].name, JSJSGlobalObject::classDescriptor.name);
      return JS_FALSE;
    }
    p0o = static_cast<JSTimer *>(pobj->js_getInterface(JS_JSTimer_GUID));
    if (!p0o) {
      object->js_throwParamTypeException(0, JSJSTimer::classDescriptor.name, JSJSGlobalObject::functionTable[4].name, JSJSGlobalObject::classDescriptor.name);
      return JS_FALSE;
    }
  }
  // call method
  ASSERT(object != NULL);
  bool rv = object->isTimerValid(p0o);
  // handle return value
  *rval = BOOLEAN_TO_JSVAL(rv);
  // success
  return JS_TRUE;
}

bool FunctionExecutable::compileForConstruct(ExecState*, ScopeChainNode* scopeChainNode)
{
    JSGlobalData* globalData = scopeChainNode->globalData;
    RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
    if (!body)
        return false;
    if (m_forceUsesArguments)
        body->setUsesArguments();
    body->finishParsing(m_parameters, m_name);
    recordParse(body->features(), body->lineNo(), body->lastLine());

    ScopeChain scopeChain(scopeChainNode);
    JSGlobalObject* globalObject = scopeChain.globalObject();

    ASSERT(!m_codeBlockForConstruct);
    m_codeBlockForConstruct = new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset(), true);
    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(body.get(), globalObject->debugger(), scopeChain, m_codeBlockForConstruct->symbolTable(), m_codeBlockForConstruct));
    generator->generate();
    m_numParametersForConstruct = m_codeBlockForConstruct->m_numParameters;
    ASSERT(m_numParametersForConstruct);
    m_numVariables = m_codeBlockForConstruct->m_numVars;
    m_symbolTable = m_codeBlockForConstruct->sharedSymbolTable();

    body->destroyData();
    return true;
}

std::error_code parseRuleList(const String& rules, Vector<ContentExtensionRule>& ruleList)
{
#if CONTENT_EXTENSIONS_PERFORMANCE_REPORTING
    double loadExtensionStartTime = monotonicallyIncreasingTime();
#endif
    RefPtr<VM> vm = VM::create();

    JSLockHolder locker(vm.get());
    JSGlobalObject* globalObject = JSGlobalObject::create(*vm, JSGlobalObject::createStructure(*vm, jsNull()));

    ExecState* exec = globalObject->globalExec();
    auto error = loadEncodedRules(*exec, rules, ruleList);

    vm = nullptr;

    if (error)
        return error;

    if (ruleList.isEmpty())
        return ContentExtensionError::JSONContainsNoRules;

#if CONTENT_EXTENSIONS_PERFORMANCE_REPORTING
    double loadExtensionEndTime = monotonicallyIncreasingTime();
    dataLogF("Time spent loading extension %f\n", (loadExtensionEndTime - loadExtensionStartTime));
#endif

    return { };
}

String Database::toJSON() const
{
    JSGlobalObject* globalObject = JSGlobalObject::create(
        m_vm, JSGlobalObject::createStructure(m_vm, jsNull()));
    
    return JSONStringify(globalObject->globalExec(), toJS(globalObject->globalExec()), 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);

    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());
        }
    }

    const VariableEnvironment& variableDeclarations = unlinkedCodeBlock->variableDeclarations();
    for (auto& entry : variableDeclarations) {
        ASSERT(entry.value.isVar());
        globalObject->addVar(callFrame, Identifier::fromUid(&vm, entry.key.get()));
    }
    return 0;
}

EncodedJSValue jsTestNondeterministicNondeterministicSetterExceptionAttr(ExecState* state, EncodedJSValue thisValue, PropertyName)
{
    UNUSED_PARAM(state);
    UNUSED_PARAM(thisValue);
    JSValue decodedThisValue = JSValue::decode(thisValue);
    auto* castedThis = jsDynamicCast<JSTestNondeterministic*>(decodedThisValue);
    if (UNLIKELY(!castedThis)) {
        return throwGetterTypeError(*state, "TestNondeterministic", "nondeterministicSetterExceptionAttr");
    }
#if ENABLE(WEB_REPLAY)
    JSGlobalObject* globalObject = state->lexicalGlobalObject();
    InputCursor& cursor = globalObject->inputCursor();
    static NeverDestroyed<const AtomicString> bindingName("TestNondeterministic.nondeterministicSetterExceptionAttr", AtomicString::ConstructFromLiteral);
    if (cursor.isCapturing()) {
        String memoizedResult = castedThis->wrapped().nondeterministicSetterExceptionAttr();
        cursor.appendInput<MemoizedDOMResult<String>>(bindingName.get().string(), memoizedResult, 0);
        JSValue result = jsStringWithCache(state, memoizedResult);
        return JSValue::encode(result);
    }

    if (cursor.isReplaying()) {
        String memoizedResult;
        MemoizedDOMResultBase* input = cursor.fetchInput<MemoizedDOMResultBase>();
        if (input && input->convertTo<String>(memoizedResult)) {
            JSValue result = jsStringWithCache(state, memoizedResult);
            return JSValue::encode(result);
        }
    }
#endif
    auto& impl = castedThis->wrapped();
    JSValue result = jsStringWithCache(state, impl.nondeterministicSetterExceptionAttr());
    return JSValue::encode(result);
}

JSObject* ProgramExecutable::compileInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
{
    ASSERT(!m_programCodeBlock);

    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());

    ScopeChain scopeChain(scopeChainNode);
    JSGlobalObject* globalObject = scopeChain.globalObject();
    
    m_programCodeBlock = adoptPtr(new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider()));
    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(programNode.get(), scopeChain, &globalObject->symbolTable(), m_programCodeBlock.get())));
    generator->generate();

    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
    }
#endif

   return 0;
}

JSValueRef JSEvaluateScriptInternal(const JSLockHolder&, ExecState* exec, JSContextRef ctx, JSObjectRef thisObject, const SourceCode& source, JSValueRef* exception)
{
    UNUSED_PARAM(ctx);

    JSObject* jsThisObject = toJS(thisObject);

    // evaluate sets "this" to the global object if it is NULL
    VM& vm = exec->vm();
    JSGlobalObject* globalObject = vm.vmEntryGlobalObject(exec);
    NakedPtr<Exception> evaluationException;
    JSValue returnValue = profiledEvaluate(globalObject->globalExec(), ProfilingReason::API, source, jsThisObject, evaluationException);

    if (evaluationException) {
        if (exception)
            *exception = toRef(exec, evaluationException->value());
#if ENABLE(REMOTE_INSPECTOR)
        // FIXME: If we have a debugger attached we could learn about ParseError exceptions through
        // ScriptDebugServer::sourceParsed and this path could produce a duplicate warning. The
        // Debugger path is currently ignored by inspector.
        // NOTE: If we don't have a debugger, this SourceCode will be forever lost to the inspector.
        // We could stash it in the inspector in case an inspector is ever opened.
        globalObject->inspectorController().reportAPIException(exec, evaluationException);
#endif
        return nullptr;
    }

    if (returnValue)
        return toRef(exec, returnValue);

    // happens, for example, when the only statement is an empty (';') statement
    return toRef(exec, jsUndefined());
}

ExceptionInfo* FunctionExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
{
    RefPtr<FunctionBodyNode> newFunctionBody = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
    if (m_forceUsesArguments)
        newFunctionBody->setUsesArguments();
    newFunctionBody->finishParsing(m_parameters, m_name);

    ScopeChain scopeChain(scopeChainNode);
    JSGlobalObject* globalObject = scopeChain.globalObject();

    OwnPtr<CodeBlock> newCodeBlock(new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset()));
    globalData->functionCodeBlockBeingReparsed = newCodeBlock.get();

    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newFunctionBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
    generator->setRegeneratingForExceptionInfo(static_cast<FunctionCodeBlock*>(codeBlock));
    generator->generate();

    ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());

#if ENABLE(JIT)
    JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get());
    ASSERT(newJITCode.size() == generatedJITCode().size());
#endif

    globalData->functionCodeBlockBeingReparsed = 0;

    return newCodeBlock->extractExceptionInfo();
}

EncodedJSValue jsTestNondeterministicNondeterministicWriteableAttr(ExecState* exec, JSObject* slotBase, EncodedJSValue thisValue, PropertyName)
{
    UNUSED_PARAM(exec);
    UNUSED_PARAM(slotBase);
    UNUSED_PARAM(thisValue);
    JSTestNondeterministic* castedThis = jsDynamicCast<JSTestNondeterministic*>(JSValue::decode(thisValue));
    if (UNLIKELY(!castedThis)) {
        if (jsDynamicCast<JSTestNondeterministicPrototype*>(slotBase))
            return reportDeprecatedGetterError(*exec, "TestNondeterministic", "nondeterministicWriteableAttr");
        return throwGetterTypeError(*exec, "TestNondeterministic", "nondeterministicWriteableAttr");
    }
#if ENABLE(WEB_REPLAY)
    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
    InputCursor& cursor = globalObject->inputCursor();
    static NeverDestroyed<const AtomicString> bindingName("TestNondeterministic.nondeterministicWriteableAttr", AtomicString::ConstructFromLiteral);
    if (cursor.isCapturing()) {
        String memoizedResult = castedThis->impl().nondeterministicWriteableAttr();
        cursor.appendInput<MemoizedDOMResult<String>>(bindingName.get().string(), memoizedResult, 0);
        JSValue result = jsStringWithCache(exec, memoizedResult);
        return JSValue::encode(result);
    }

    if (cursor.isReplaying()) {
        String memoizedResult;
        MemoizedDOMResultBase* input = cursor.fetchInput<MemoizedDOMResultBase>();
        if (input && input->convertTo<String>(memoizedResult)) {
            JSValue result = jsStringWithCache(exec, memoizedResult);
            return JSValue::encode(result);
        }
    }
#endif
    TestNondeterministic& impl = castedThis->impl();
    JSValue result = jsStringWithCache(exec, impl.nondeterministicWriteableAttr());
    return JSValue::encode(result);
}

// ECMA 15.3.2 The Function Constructor
JSObject* constructFunction(ExecState* exec, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
{
    // Functions need to have a space following the opening { due to for web compatibility
    // see https://bugs.webkit.org/show_bug.cgi?id=24350
    // We also need \n before the closing } to handle // comments at the end of the last line
    UString program;
    if (args.isEmpty())
        program = "(function() { \n})";
    else if (args.size() == 1)
        program = makeString("(function() { ", args.at(0).toString(exec), "\n})");
    else {
        StringBuilder builder;
        builder.append("(function(");
        builder.append(args.at(0).toString(exec));
        for (size_t i = 1; i < args.size() - 1; i++) {
            builder.append(",");
            builder.append(args.at(i).toString(exec));
        }
        builder.append(") { ");
        builder.append(args.at(args.size() - 1).toString(exec));
        builder.append("\n})");
        program = builder.build();
    }

    int errLine;
    UString errMsg;
    SourceCode source = makeSource(program, sourceURL, lineNumber);
    RefPtr<FunctionExecutable> function = FunctionExecutable::fromGlobalCode(functionName, exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
    if (!function)
        return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());

    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
    ScopeChain scopeChain(globalObject, globalObject->globalData(), globalObject, exec->globalThisValue());
    return new (exec) JSFunction(exec, function, scopeChain.node());
}

// ECMA 15.3.2 The Function Constructor
JSObject* constructFunction(ExecState* exec, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
{
    UString program;
    if (args.isEmpty())
        program = "(function(){})";
    else if (args.size() == 1)
        program = "(function(){" + args.at(exec, 0)->toString(exec) + "})";
    else {
        program = "(function(" + args.at(exec, 0)->toString(exec);
        for (size_t i = 1; i < args.size() - 1; i++)
            program += "," + args.at(exec, i)->toString(exec);
        program += "){" + args.at(exec, args.size() - 1)->toString(exec) + "})";
    }

    int errLine;
    UString errMsg;
    SourceCode source = makeSource(program, sourceURL, lineNumber);
    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);

    FunctionBodyNode* body = functionBody(programNode.get());
    if (!body)
        return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());

    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
    ScopeChain scopeChain(globalObject, globalObject->globalData(), exec->globalThisValue());
    return new (exec) JSFunction(exec, functionName, body, scopeChain.node());
}

JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
{
    ExecState* exec = toJS(ctx);
    exec->globalData().heap.registerThread();
    JSLock lock(exec);

    JSObject* jsThisObject = toJS(thisObject);

    // evaluate sets "this" to the global object if it is NULL
    JSGlobalObject* globalObject = exec->dynamicGlobalObject();
    SourceCode source = makeSource(script->ustring(), sourceURL->ustring(), startingLineNumber);
    Completion completion = evaluate(globalObject->globalExec(), globalObject->globalScopeChain(), source, jsThisObject);

    if (completion.complType() == Throw) {
        if (exception)
            *exception = toRef(completion.value());
        return 0;
    }
    
    if (completion.value())
        return toRef(completion.value());
    
    // happens, for example, when the only statement is an empty (';') statement
    return toRef(jsUndefined());
}