C++ constructEmptyArray函数代码示例

JSValue Database::toJS(ExecState* exec) const
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);
    JSObject* result = constructEmptyObject(exec);
    
    JSArray* bytecodes = constructEmptyArray(exec, 0);
    RETURN_IF_EXCEPTION(scope, JSValue());
    for (unsigned i = 0; i < m_bytecodes.size(); ++i)
        bytecodes->putDirectIndex(exec, i, m_bytecodes[i].toJS(exec));
    result->putDirect(vm, exec->propertyNames().bytecodes, bytecodes);
    
    JSArray* compilations = constructEmptyArray(exec, 0);
    RETURN_IF_EXCEPTION(scope, JSValue());
    for (unsigned i = 0; i < m_compilations.size(); ++i)
        compilations->putDirectIndex(exec, i, m_compilations[i]->toJS(exec));
    result->putDirect(vm, exec->propertyNames().compilations, compilations);
    
    JSArray* events = constructEmptyArray(exec, 0);
    RETURN_IF_EXCEPTION(scope, JSValue());
    for (unsigned i = 0; i < m_events.size(); ++i)
        events->putDirectIndex(exec, i, m_events[i].toJS(exec));
    result->putDirect(vm, exec->propertyNames().events, events);
    
    return result;
}

EncodedJSValue JSC_HOST_CALL moduleLoaderObjectRequestedModules(ExecState* exec)
{
    JSModuleRecord* moduleRecord = jsDynamicCast<JSModuleRecord*>(exec->argument(0));
    if (!moduleRecord)
        return JSValue::encode(constructEmptyArray(exec, nullptr));

    JSArray* result = constructEmptyArray(exec, nullptr, moduleRecord->requestedModules().size());
    size_t i = 0;
    for (auto& key : moduleRecord->requestedModules())
        result->putDirectIndex(exec, i++, jsString(exec, key.get()));

    return JSValue::encode(result);
}

static JSArray* getJSListenerFunctions(ExecState* exec, Document* document, const EventListenerInfo& listenerInfo)
{
    JSArray* result = constructEmptyArray(exec, nullptr);
    size_t handlersCount = listenerInfo.eventListenerVector.size();
    for (size_t i = 0, outputIndex = 0; i < handlersCount; ++i) {
        const JSEventListener* jsListener = JSEventListener::cast(listenerInfo.eventListenerVector[i].listener.get());
        if (!jsListener) {
            ASSERT_NOT_REACHED();
            continue;
        }

        // Hide listeners from other contexts.
        if (&jsListener->isolatedWorld() != &currentWorld(exec))
            continue;

        JSObject* function = jsListener->jsFunction(document);
        if (!function)
            continue;

        JSObject* listenerEntry = constructEmptyObject(exec);
        listenerEntry->putDirect(exec->vm(), Identifier::fromString(exec, "listener"), function);
        listenerEntry->putDirect(exec->vm(), Identifier::fromString(exec, "useCapture"), jsBoolean(listenerInfo.eventListenerVector[i].useCapture));
        result->putDirectIndex(exec, outputIndex++, JSValue(listenerEntry));
    }
    return result;
}

EncodedJSValue JSC_HOST_CALL webAssemblyModuleImports(ExecState* exec)
{
    VM& vm = exec->vm();
    auto* globalObject = exec->lexicalGlobalObject();
    auto throwScope = DECLARE_THROW_SCOPE(vm);

    JSWebAssemblyModule* module = jsDynamicCast<JSWebAssemblyModule*>(vm, exec->argument(0));
    if (!module)
        return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, "WebAssembly.Module.imports called with non WebAssembly.Module argument"_s)));

    JSArray* result = constructEmptyArray(exec, nullptr, globalObject);
    RETURN_IF_EXCEPTION(throwScope, { });

    const auto& imports = module->moduleInformation().imports;
    if (imports.size()) {
        Identifier module = Identifier::fromString(exec, "module");
        Identifier name = Identifier::fromString(exec, "name");
        Identifier kind = Identifier::fromString(exec, "kind");
        for (const Wasm::Import& imp : imports) {
            JSObject* obj = constructEmptyObject(exec);
            RETURN_IF_EXCEPTION(throwScope, { });
            obj->putDirect(vm, module, jsString(exec, String::fromUTF8(imp.module)));
            obj->putDirect(vm, name, jsString(exec, String::fromUTF8(imp.field)));
            obj->putDirect(vm, kind, jsString(exec, String(makeString(imp.kind))));
            result->push(exec, obj);
            RETURN_IF_EXCEPTION(throwScope, { });
        }
    }

    return JSValue::encode(result);
}

EncodedJSValue JSC_HOST_CALL webAssemblyModuleCustomSections(ExecState* exec)
{
    VM& vm = exec->vm();
    auto* globalObject = exec->lexicalGlobalObject();
    auto throwScope = DECLARE_THROW_SCOPE(vm);

    JSWebAssemblyModule* module = jsDynamicCast<JSWebAssemblyModule*>(vm, exec->argument(0));
    if (!module)
        return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, "WebAssembly.Module.customSections called with non WebAssembly.Module argument"_s)));

    const String sectionNameString = exec->argument(1).getString(exec);
    RETURN_IF_EXCEPTION(throwScope, { });

    JSArray* result = constructEmptyArray(exec, nullptr, globalObject);
    RETURN_IF_EXCEPTION(throwScope, { });

    const auto& customSections = module->moduleInformation().customSections;
    for (const Wasm::CustomSection& section : customSections) {
        if (String::fromUTF8(section.name) == sectionNameString) {
            auto buffer = ArrayBuffer::tryCreate(section.payload.data(), section.payload.size());
            if (!buffer)
                return JSValue::encode(throwException(exec, throwScope, createOutOfMemoryError(exec)));

            result->push(exec, JSArrayBuffer::create(vm, globalObject->arrayBufferStructure(ArrayBufferSharingMode::Default), WTFMove(buffer)));
            RETURN_IF_EXCEPTION(throwScope, { });
        }
    }

    return JSValue::encode(result);
}

static JSValue idbKeyToJSValue(ExecState* exec, JSDOMGlobalObject* globalObject, IDBKey* key)
{
    if (!key) {
        // This should be undefined, not null.
        // Spec: http://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBKeyRange
        return jsUndefined();
    }

    switch (key->type()) {
    case IDBKey::ArrayType:
        {
            const IDBKey::KeyArray& inArray = key->array();
            size_t size = inArray.size();
            JSArray* outArray = constructEmptyArray(exec, 0, globalObject, size);
            for (size_t i = 0; i < size; ++i) {
                IDBKey* arrayKey = inArray.at(i).get();
                outArray->putDirectIndex(exec, i, idbKeyToJSValue(exec, globalObject, arrayKey));
            }
            return JSValue(outArray);
        }
    case IDBKey::StringType:
        return jsStringWithCache(exec, key->string());
    case IDBKey::DateType:
        return jsDateOrNull(exec, key->date());
    case IDBKey::NumberType:
        return jsNumber(key->number());
    case IDBKey::MinType:
    case IDBKey::InvalidType:
        ASSERT_NOT_REACHED();
        return jsUndefined();
    }

    ASSERT_NOT_REACHED();
    return jsUndefined();
}

JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, IDBKey* key)
{
    if (!key)
        return jsNull();

    switch (key->type()) {
    case IDBKey::ArrayType:
        {
            const IDBKey::KeyArray& inArray = key->array();
            size_t size = inArray.size();
            JSArray* outArray = constructEmptyArray(exec, globalObject, size);
            JSGlobalData& globalData = exec->globalData();
            for (size_t i = 0; i < size; ++i) {
                IDBKey* arrayKey = inArray.at(i).get();
                outArray->initializeIndex(globalData, i, toJS(exec, globalObject, arrayKey));
            }
            return JSValue(outArray);
        }
    case IDBKey::StringType:
        return jsStringWithCache(exec, key->string());
    case IDBKey::DateType:
        return jsDateOrNull(exec, key->date());
    case IDBKey::NumberType:
        return jsNumber(key->number());
    case IDBKey::MinType:
    case IDBKey::InvalidType:
        ASSERT_NOT_REACHED();
        return jsUndefined();
    }

    ASSERT_NOT_REACHED();
    return jsUndefined();
}

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

    JSValue value = exec->uncheckedArgument(0);
    JSWeakSet* weakSet = jsDynamicCast<JSWeakSet*>(value);
    if (!weakSet)
        return jsUndefined();

    unsigned fetched = 0;
    unsigned numberToFetch = 100;

    JSValue numberToFetchArg = exec->argument(1);
    double fetchDouble = numberToFetchArg.toInteger(exec);
    if (fetchDouble >= 0)
        numberToFetch = static_cast<unsigned>(fetchDouble);

    JSArray* array = constructEmptyArray(exec, nullptr);
    for (auto it = weakSet->weakMapData()->begin(); it != weakSet->weakMapData()->end(); ++it) {
        JSObject* entry = constructEmptyObject(exec);
        entry->putDirect(exec->vm(), Identifier::fromString(exec, "value"), it->key);
        array->putDirectIndex(exec, fetched++, entry);
        if (numberToFetch && fetched >= numberToFetch)
            break;
    }

    return array;
}

static JSArray* getJSListenerFunctions(ExecState& state, Document* document, const EventListenerInfo& listenerInfo)
{
    VM& vm = state.vm();
    auto scope = DECLARE_THROW_SCOPE(vm);
    JSArray* result = constructEmptyArray(&state, nullptr);
    RETURN_IF_EXCEPTION(scope, nullptr);
    size_t handlersCount = listenerInfo.eventListenerVector.size();
    for (size_t i = 0, outputIndex = 0; i < handlersCount; ++i) {
        const JSEventListener* jsListener = JSEventListener::cast(&listenerInfo.eventListenerVector[i]->callback());
        if (!jsListener) {
            ASSERT_NOT_REACHED();
            continue;
        }

        // Hide listeners from other contexts.
        if (&jsListener->isolatedWorld() != &currentWorld(&state))
            continue;

        JSObject* function = jsListener->jsFunction(document);
        if (!function)
            continue;

        JSObject* listenerEntry = constructEmptyObject(&state);
        listenerEntry->putDirect(vm, Identifier::fromString(&state, "listener"), function);
        listenerEntry->putDirect(vm, Identifier::fromString(&state, "useCapture"), jsBoolean(listenerInfo.eventListenerVector[i]->useCapture()));
        result->putDirectIndex(&state, outputIndex++, JSValue(listenerEntry));
    }
    return result;
}

void BytecodeSequence::addSequenceProperties(ExecState* exec, JSObject* result) const
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);
    JSArray* header = constructEmptyArray(exec, 0);
    RETURN_IF_EXCEPTION(scope, void());
    for (unsigned i = 0; i < m_header.size(); ++i)
        header->putDirectIndex(exec, i, jsString(exec, String::fromUTF8(m_header[i])));
    result->putDirect(vm, exec->propertyNames().header, header);
    
    JSArray* sequence = constructEmptyArray(exec, 0);
    RETURN_IF_EXCEPTION(scope, void());
    for (unsigned i = 0; i < m_sequence.size(); ++i)
        sequence->putDirectIndex(exec, i, m_sequence[i].toJS(exec));
    result->putDirect(vm, exec->propertyNames().bytecode, sequence);
}

JSValue Database::toJS(ExecState* exec) const
{
    JSObject* result = constructEmptyObject(exec);
    
    JSArray* bytecodes = constructEmptyArray(exec, 0);
    for (unsigned i = 0; i < m_bytecodes.size(); ++i)
        bytecodes->putDirectIndex(exec, i, m_bytecodes[i].toJS(exec));
    result->putDirect(exec->vm(), exec->propertyNames().bytecodes, bytecodes);
    
    JSArray* compilations = constructEmptyArray(exec, 0);
    for (unsigned i = 0; i < m_compilations.size(); ++i)
        compilations->putDirectIndex(exec, i, m_compilations[i]->toJS(exec));
    result->putDirect(exec->vm(), exec->propertyNames().compilations, compilations);
    
    return result;
}

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

    VM& vm = exec->vm();
    JSValue iterator;
    JSValue value = exec->uncheckedArgument(0);
    if (JSMapIterator* mapIterator = jsDynamicCast<JSMapIterator*>(value))
        iterator = mapIterator->clone(exec);
    else if (JSSetIterator* setIterator = jsDynamicCast<JSSetIterator*>(value))
        iterator = setIterator->clone(exec);
    else if (JSStringIterator* stringIterator = jsDynamicCast<JSStringIterator*>(value))
        iterator = stringIterator->clone(exec);
    else if (JSPropertyNameIterator* propertyNameIterator = jsDynamicCast<JSPropertyNameIterator*>(value)) {
        iterator = propertyNameIterator->clone(exec);
        if (UNLIKELY(vm.exception()))
            return JSValue();
    } else {
        if (JSObject* iteratorObject = jsDynamicCast<JSObject*>(value)) {
            // Array Iterators are created in JS for performance reasons. Thus the only way to know we have one is to
            // look for a property that is unique to them.
            if (JSValue nextIndex = iteratorObject->getDirect(vm, vm.propertyNames->builtinNames().arrayIteratorNextIndexPrivateName()))
                iterator = cloneArrayIteratorObject(exec, vm, iteratorObject, nextIndex);
        }
    }
    if (!iterator)
        return jsUndefined();

    unsigned numberToFetch = 5;
    JSValue numberToFetchArg = exec->argument(1);
    double fetchDouble = numberToFetchArg.toInteger(exec);
    if (fetchDouble >= 0)
        numberToFetch = static_cast<unsigned>(fetchDouble);

    JSArray* array = constructEmptyArray(exec, nullptr);
    if (UNLIKELY(vm.exception()))
        return jsUndefined();

    for (unsigned i = 0; i < numberToFetch; ++i) {
        JSValue next = iteratorStep(exec, iterator);
        if (UNLIKELY(vm.exception()))
            break;
        if (next.isFalse())
            break;

        JSValue nextValue = iteratorValue(exec, next);
        if (UNLIKELY(vm.exception()))
            break;

        JSObject* entry = constructEmptyObject(exec);
        entry->putDirect(exec->vm(), Identifier::fromString(exec, "value"), nextValue);
        array->putDirectIndex(exec, i, entry);
    }

    iteratorClose(exec, iterator);

    return array;
}

void BytecodeSequence::addSequenceProperties(ExecState* exec, JSObject* result) const
{
    VM& vm = exec->vm();
    JSArray* header = constructEmptyArray(exec, 0);
    if (UNLIKELY(vm.exception()))
        return;
    for (unsigned i = 0; i < m_header.size(); ++i)
        header->putDirectIndex(exec, i, jsString(exec, String::fromUTF8(m_header[i])));
    result->putDirect(vm, exec->propertyNames().header, header);
    
    JSArray* sequence = constructEmptyArray(exec, 0);
    if (UNLIKELY(vm.exception()))
        return;
    for (unsigned i = 0; i < m_sequence.size(); ++i)
        sequence->putDirectIndex(exec, i, m_sequence[i].toJS(exec));
    result->putDirect(vm, exec->propertyNames().bytecode, sequence);
}

JSValue Compilation::toJS(ExecState* exec) const
{
    JSObject* result = constructEmptyObject(exec);

    result->putDirect(exec->vm(), exec->propertyNames().bytecodesID, jsNumber(m_bytecodes->id()));
    result->putDirect(exec->vm(), exec->propertyNames().compilationKind, jsString(exec, String::fromUTF8(toCString(m_kind))));

    JSArray* profiledBytecodes = constructEmptyArray(exec, 0);
    for (unsigned i = 0; i < m_profiledBytecodes.size(); ++i)
        profiledBytecodes->putDirectIndex(exec, i, m_profiledBytecodes[i].toJS(exec));
    result->putDirect(exec->vm(), exec->propertyNames().profiledBytecodes, profiledBytecodes);

    JSArray* descriptions = constructEmptyArray(exec, 0);
    for (unsigned i = 0; i < m_descriptions.size(); ++i)
        descriptions->putDirectIndex(exec, i, m_descriptions[i].toJS(exec));
    result->putDirect(exec->vm(), exec->propertyNames().descriptions, descriptions);

    JSArray* counters = constructEmptyArray(exec, 0);
    for (auto it = m_counters.begin(), end = m_counters.end(); it != end; ++it) {
        JSObject* counterEntry = constructEmptyObject(exec);
        counterEntry->putDirect(exec->vm(), exec->propertyNames().origin, it->key.toJS(exec));
        counterEntry->putDirect(exec->vm(), exec->propertyNames().executionCount, jsNumber(it->value->count()));
        counters->push(exec, counterEntry);
    }
    result->putDirect(exec->vm(), exec->propertyNames().counters, counters);

    JSArray* exitSites = constructEmptyArray(exec, 0);
    for (unsigned i = 0; i < m_osrExitSites.size(); ++i)
        exitSites->putDirectIndex(exec, i, m_osrExitSites[i].toJS(exec));
    result->putDirect(exec->vm(), exec->propertyNames().osrExitSites, exitSites);

    JSArray* exits = constructEmptyArray(exec, 0);
    for (unsigned i = 0; i < m_osrExits.size(); ++i)
        exits->putDirectIndex(exec, i, m_osrExits[i].toJS(exec));
    result->putDirect(exec->vm(), exec->propertyNames().osrExits, exits);

    result->putDirect(exec->vm(), exec->propertyNames().numInlinedGetByIds, jsNumber(m_numInlinedGetByIds));
    result->putDirect(exec->vm(), exec->propertyNames().numInlinedPutByIds, jsNumber(m_numInlinedPutByIds));
    result->putDirect(exec->vm(), exec->propertyNames().numInlinedCalls, jsNumber(m_numInlinedCalls));
    result->putDirect(exec->vm(), exec->propertyNames().jettisonReason, jsString(exec, String::fromUTF8(toCString(m_jettisonReason))));
    if (!m_additionalJettisonReason.isNull())
        result->putDirect(exec->vm(), exec->propertyNames().additionalJettisonReason, jsString(exec, String::fromUTF8(m_additionalJettisonReason)));

    return result;
}

JSValue OriginStack::toJS(ExecState* exec) const
{
    JSArray* result = constructEmptyArray(exec, 0);
    
    for (unsigned i = 0; i < m_stack.size(); ++i)
        result->putDirectIndex(exec, i, m_stack[i].toJS(exec));
    
    return result;
}