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react-native/ReactCommon/cxxreact/JSCExecutor.cpp

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// Copyright 2004-present Facebook. All Rights Reserved.
#include "JSCExecutor.h"
#include <algorithm>
#include <condition_variable>
#include <mutex>
#include <sstream>
#include <string>
#include <glog/logging.h>
#include <folly/json.h>
#include <folly/Exception.h>
#include <folly/Memory.h>
#include <folly/Conv.h>
#include <fcntl.h>
#include <sys/time.h>
#include <system_error>
#include <jschelpers/JSCHelpers.h>
#include <jschelpers/Value.h>
#ifdef WITH_INSPECTOR
#include <inspector/Inspector.h>
#endif
#include "JSBundleType.h"
#include "Platform.h"
#include "SystraceSection.h"
#include "JSCNativeModules.h"
#include "JSCSamplingProfiler.h"
#include "JSCUtils.h"
#include "JSModulesUnbundle.h"
#include "ModuleRegistry.h"
#include "RecoverableError.h"
#if defined(WITH_JSC_EXTRA_TRACING) || (DEBUG && defined(WITH_FBSYSTRACE))
#include "JSCTracing.h"
#endif
#ifdef WITH_JSC_EXTRA_TRACING
#include "JSCLegacyProfiler.h"
#include "JSCLegacyTracing.h"
#endif
#if !defined(__APPLE__) && defined(WITH_JSC_EXTRA_TRACING)
#include <JavaScriptCore/API/JSProfilerPrivate.h>
#endif
#ifdef WITH_JSC_MEMORY_PRESSURE
#include <jsc_memory.h>
#endif
#ifdef WITH_FB_MEMORY_PROFILING
#include "JSCMemory.h"
#endif
#if defined(WITH_FB_JSC_TUNING) && defined(__ANDROID__)
#include <jsc_config_android.h>
#endif
#ifdef JSC_HAS_PERF_STATS_API
#include "JSCPerfStats.h"
#endif
namespace facebook {
namespace react {
using namespace detail;
namespace {
template<JSValueRef (JSCExecutor::*method)(size_t, const JSValueRef[])>
inline JSObjectCallAsFunctionCallback exceptionWrapMethod() {
struct funcWrapper {
static JSValueRef call(
JSContextRef ctx,
JSObjectRef function,
JSObjectRef thisObject,
size_t argumentCount,
const JSValueRef arguments[],
JSValueRef *exception) {
try {
auto executor = Object::getGlobalObject(ctx).getPrivate<JSCExecutor>();
return (executor->*method)(argumentCount, arguments);
} catch (...) {
*exception = translatePendingCppExceptionToJSError(ctx, function);
return Value::makeUndefined(ctx);
}
}
};
return &funcWrapper::call;
}
template<JSValueRef (JSCExecutor::*method)(JSObjectRef object, JSStringRef propertyName)>
inline JSObjectGetPropertyCallback exceptionWrapMethod() {
struct funcWrapper {
static JSValueRef call(
JSContextRef ctx,
JSObjectRef object,
JSStringRef propertyName,
JSValueRef *exception) {
try {
auto executor = Object::getGlobalObject(ctx).getPrivate<JSCExecutor>();
return (executor->*method)(object, propertyName);
} catch (...) {
*exception = translatePendingCppExceptionToJSError(ctx, object);
return Value::makeUndefined(ctx);
}
}
};
return &funcWrapper::call;
}
}
#if DEBUG
static JSValueRef nativeInjectHMRUpdate(
JSContextRef ctx,
JSObjectRef function,
JSObjectRef thisObject,
size_t argumentCount,
const JSValueRef arguments[],
JSValueRef *exception) {
String execJSString = Value(ctx, arguments[0]).toString();
String jsURL = Value(ctx, arguments[1]).toString();
evaluateScript(ctx, execJSString, jsURL);
return Value::makeUndefined(ctx);
}
#endif
std::unique_ptr<JSExecutor> JSCExecutorFactory::createJSExecutor(
std::shared_ptr<ExecutorDelegate> delegate, std::shared_ptr<MessageQueueThread> jsQueue) {
return std::unique_ptr<JSExecutor>(
new JSCExecutor(delegate, jsQueue, m_cacheDir, m_jscConfig));
}
JSCExecutor::JSCExecutor(std::shared_ptr<ExecutorDelegate> delegate,
std::shared_ptr<MessageQueueThread> messageQueueThread,
const std::string& cacheDir,
const folly::dynamic& jscConfig) throw(JSException) :
m_delegate(delegate),
m_deviceCacheDir(cacheDir),
m_messageQueueThread(messageQueueThread),
m_nativeModules(delegate ? delegate->getModuleRegistry() : nullptr),
m_jscConfig(jscConfig) {
initOnJSVMThread();
{
SystraceSection s("nativeModuleProxy object");
installGlobalProxy(m_context, "nativeModuleProxy",
exceptionWrapMethod<&JSCExecutor::getNativeModule>());
}
}
JSCExecutor::JSCExecutor(
std::shared_ptr<ExecutorDelegate> delegate,
std::shared_ptr<MessageQueueThread> messageQueueThread,
int workerId,
JSCExecutor *owner,
std::string scriptURL,
std::unordered_map<std::string, std::string> globalObjAsJSON,
const folly::dynamic& jscConfig) :
m_delegate(delegate),
m_workerId(workerId),
m_owner(owner),
m_deviceCacheDir(owner->m_deviceCacheDir),
m_messageQueueThread(messageQueueThread),
m_nativeModules(delegate->getModuleRegistry()),
m_jscConfig(jscConfig) {
// We post initOnJSVMThread here so that the owner doesn't have to wait for
// initialization on its own thread
m_messageQueueThread->runOnQueue([this, scriptURL,
globalObjAsJSON=std::move(globalObjAsJSON)] () {
initOnJSVMThread();
installNativeHook<&JSCExecutor::nativePostMessage>("postMessage");
for (auto& it : globalObjAsJSON) {
setGlobalVariable(std::move(it.first),
folly::make_unique<JSBigStdString>(std::move(it.second)));
}
// Try to load the script from the network if script is a URL
// NB: For security, this will only work in debug builds
std::unique_ptr<const JSBigString> script;
if (scriptURL.find("http://") == 0 || scriptURL.find("https://") == 0) {
std::stringstream outfileBuilder;
outfileBuilder << m_deviceCacheDir << "/workerScript" << m_workerId << ".js";
script = folly::make_unique<JSBigStdString>(
WebWorkerUtil::loadScriptFromNetworkSync(scriptURL, outfileBuilder.str()));
} else {
// TODO(9604438): Protect against script does not exist
script = WebWorkerUtil::loadScriptFromAssets(scriptURL);
}
// TODO(9994180): Throw on error
loadApplicationScript(std::move(script), std::move(scriptURL));
});
}
JSCExecutor::~JSCExecutor() {
CHECK(*m_isDestroyed) << "JSCExecutor::destroy() must be called before its destructor!";
}
void JSCExecutor::destroy() {
*m_isDestroyed = true;
if (m_messageQueueThread.get()) {
m_messageQueueThread->runOnQueueSync([this] () {
terminateOnJSVMThread();
});
} else {
terminateOnJSVMThread();
}
}
void JSCExecutor::setContextName(const std::string& name) {
String jsName = String(m_context, name.c_str());
JSC_JSGlobalContextSetName(m_context, jsName);
}
void JSCExecutor::initOnJSVMThread() throw(JSException) {
SystraceSection s("JSCExecutor.initOnJSVMThread");
#if defined(__APPLE__)
const bool useCustomJSC = m_jscConfig.getDefault("UseCustomJSC", false).getBool();
if (useCustomJSC) {
JSC_configureJSCForIOS(true, toJson(m_jscConfig));
}
#else
const bool useCustomJSC = false;
#endif
#if defined(WITH_FB_JSC_TUNING) && defined(__ANDROID__)
configureJSCForAndroid(m_jscConfig);
#endif
// Create a custom global class, so we can store data in it later using JSObjectSetPrivate
JSClassRef globalClass = nullptr;
{
SystraceSection s("JSClassCreate");
JSClassDefinition definition = kJSClassDefinitionEmpty;
definition.attributes |= kJSClassAttributeNoAutomaticPrototype;
globalClass = JSC_JSClassCreate(useCustomJSC, &definition);
}
{
SystraceSection s("JSGlobalContextCreateInGroup");
m_context = JSC_JSGlobalContextCreateInGroup(useCustomJSC, nullptr, globalClass);
}
JSC_JSClassRelease(useCustomJSC, globalClass);
// Add a pointer to ourselves so we can retrieve it later in our hooks
Object::getGlobalObject(m_context).setPrivate(this);
#ifdef WITH_INSPECTOR
Inspector::instance().registerGlobalContext("main", m_context);
#endif
installNativeHook<&JSCExecutor::nativeFlushQueueImmediate>("nativeFlushQueueImmediate");
installNativeHook<&JSCExecutor::nativeCallSyncHook>("nativeCallSyncHook");
// Webworker support
installNativeHook<&JSCExecutor::nativeStartWorker>("nativeStartWorker");
installNativeHook<&JSCExecutor::nativePostMessageToWorker>("nativePostMessageToWorker");
installNativeHook<&JSCExecutor::nativeTerminateWorker>("nativeTerminateWorker");
installGlobalFunction(m_context, "nativeLoggingHook", JSNativeHooks::loggingHook);
installGlobalFunction(m_context, "nativePerformanceNow", JSNativeHooks::nowHook);
#if DEBUG
installGlobalFunction(m_context, "nativeInjectHMRUpdate", nativeInjectHMRUpdate);
#endif
#if defined(WITH_JSC_EXTRA_TRACING) || (DEBUG && defined(WITH_FBSYSTRACE))
addNativeTracingHooks(m_context);
#endif
#ifdef WITH_JSC_EXTRA_TRACING
addNativeProfilingHooks(m_context);
addNativeTracingLegacyHooks(m_context);
#endif
PerfLogging::installNativeHooks(m_context);
#if defined(__APPLE__) || defined(WITH_JSC_EXTRA_TRACING)
if (JSC_JSSamplingProfilerEnabled(m_context)) {
initSamplingProfilerOnMainJSCThread(m_context);
}
#endif
#ifdef WITH_FB_MEMORY_PROFILING
addNativeMemoryHooks(m_context);
#endif
#ifdef JSC_HAS_PERF_STATS_API
addJSCPerfStatsHooks(m_context);
#endif
}
void JSCExecutor::terminateOnJSVMThread() {
// terminateOwnedWebWorker mutates m_ownedWorkers so collect all the workers
// to terminate first
std::vector<int> workerIds;
for (auto& it : m_ownedWorkers) {
workerIds.push_back(it.first);
}
for (int workerId : workerIds) {
terminateOwnedWebWorker(workerId);
}
m_nativeModules.reset();
#ifdef WITH_INSPECTOR
Inspector::instance().unregisterGlobalContext(m_context);
#endif
JSC_JSGlobalContextRelease(m_context);
m_context = nullptr;
}
#ifdef WITH_FBJSCEXTENSIONS
static const char* explainLoadSourceStatus(JSLoadSourceStatus status) {
switch (status) {
case JSLoadSourceIsCompiled:
return "No error encountered during source load";
case JSLoadSourceErrorOnRead:
return "Error reading source";
case JSLoadSourceIsNotCompiled:
return "Source is not compiled";
case JSLoadSourceErrorVersionMismatch:
return "Source version not supported";
default:
return "Bad error code";
}
}
#endif
void JSCExecutor::loadApplicationScript(std::unique_ptr<const JSBigString> script, std::string sourceURL) {
SystraceSection s("JSCExecutor::loadApplicationScript",
"sourceURL", sourceURL);
ReactMarker::logMarker("RUN_JS_BUNDLE_START");
String jsSourceURL(m_context, sourceURL.c_str());
// TODO t15069155: reduce the number of overrides here
#ifdef WITH_FBJSCEXTENSIONS
if (auto fileStr = dynamic_cast<const JSBigFileString *>(script.get())) {
JSLoadSourceStatus jsStatus;
auto bcSourceCode = JSCreateSourceCodeFromFile(fileStr->fd(), jsSourceURL, nullptr, &jsStatus);
switch (jsStatus) {
case JSLoadSourceIsCompiled:
if (!bcSourceCode) {
throw std::runtime_error("Unexpected error opening compiled bundle");
}
evaluateSourceCode(m_context, bcSourceCode, jsSourceURL);
flush();
ReactMarker::logMarker("CREATE_REACT_CONTEXT_END");
ReactMarker::logMarker("RUN_JS_BUNDLE_END");
return;
case JSLoadSourceErrorVersionMismatch:
throw RecoverableError(explainLoadSourceStatus(jsStatus));
case JSLoadSourceErrorOnRead:
case JSLoadSourceIsNotCompiled:
// Not bytecode, fall through.
break;
}
}
#elif defined(__APPLE__)
BundleHeader header;
memcpy(&header, script->c_str(), std::min(script->size(), sizeof(BundleHeader)));
auto scriptTag = parseTypeFromHeader(header);
if (scriptTag == ScriptTag::BCBundle) {
using file_ptr = std::unique_ptr<FILE, decltype(&fclose)>;
file_ptr source(fopen(sourceURL.c_str(), "r"), fclose);
int sourceFD = fileno(source.get());
JSValueRef jsError;
JSValueRef result = JSC_JSEvaluateBytecodeBundle(m_context, NULL, sourceFD, jsSourceURL, &jsError);
if (result == nullptr) {
formatAndThrowJSException(m_context, jsError, jsSourceURL);
}
} else
#endif
{
#ifdef WITH_FBSYSTRACE
fbsystrace_begin_section(
TRACE_TAG_REACT_CXX_BRIDGE,
"JSCExecutor::loadApplicationScript-createExpectingAscii");
#endif
ReactMarker::logMarker("loadApplicationScript_startStringConvert");
String jsScript = jsStringFromBigString(m_context, *script);
ReactMarker::logMarker("loadApplicationScript_endStringConvert");
#ifdef WITH_FBSYSTRACE
fbsystrace_end_section(TRACE_TAG_REACT_CXX_BRIDGE);
#endif
evaluateScript(m_context, jsScript, jsSourceURL);
}
flush();
ReactMarker::logMarker("CREATE_REACT_CONTEXT_END");
ReactMarker::logMarker("RUN_JS_BUNDLE_END");
}
void JSCExecutor::setJSModulesUnbundle(std::unique_ptr<JSModulesUnbundle> unbundle) {
if (!m_unbundle) {
installNativeHook<&JSCExecutor::nativeRequire>("nativeRequire");
}
m_unbundle = std::move(unbundle);
}
void JSCExecutor::bindBridge() throw(JSException) {
SystraceSection s("JSCExecutor::bindBridge");
std::call_once(m_bindFlag, [this] {
auto global = Object::getGlobalObject(m_context);
auto batchedBridgeValue = global.getProperty("__fbBatchedBridge");
if (batchedBridgeValue.isUndefined()) {
auto requireBatchedBridge = global.getProperty("__fbRequireBatchedBridge");
if (!requireBatchedBridge.isUndefined()) {
batchedBridgeValue = requireBatchedBridge.asObject().callAsFunction({});
}
if (batchedBridgeValue.isUndefined()) {
throwJSExecutionException("Could not get BatchedBridge, make sure your bundle is packaged correctly");
}
}
auto batchedBridge = batchedBridgeValue.asObject();
m_callFunctionReturnFlushedQueueJS = batchedBridge.getProperty("callFunctionReturnFlushedQueue").asObject();
m_invokeCallbackAndReturnFlushedQueueJS = batchedBridge.getProperty("invokeCallbackAndReturnFlushedQueue").asObject();
m_flushedQueueJS = batchedBridge.getProperty("flushedQueue").asObject();
m_callFunctionReturnResultAndFlushedQueueJS = batchedBridge.getProperty("callFunctionReturnResultAndFlushedQueue").asObject();
});
}
void JSCExecutor::callNativeModules(Value&& value) {
SystraceSection s("JSCExecutor::callNativeModules");
// If this fails, you need to pass a fully functional delegate with a
// module registry to the factory/ctor.
CHECK(m_delegate) << "Attempting to use native modules without a delegate";
try {
auto calls = value.toJSONString();
m_delegate->callNativeModules(*this, folly::parseJson(calls), true);
} catch (...) {
std::string message = "Error in callNativeModules()";
try {
message += ":" + value.toString().str();
} catch (...) {
// ignored
}
std::throw_with_nested(std::runtime_error(message));
}
}
void JSCExecutor::flush() {
SystraceSection s("JSCExecutor::flush");
if (m_flushedQueueJS) {
callNativeModules(m_flushedQueueJS->callAsFunction({}));
return;
}
// When a native module is called from JS, BatchedBridge.enqueueNativeCall()
// is invoked. For that to work, require('BatchedBridge') has to be called,
// and when that happens, __fbBatchedBridge is set as a side effect.
auto global = Object::getGlobalObject(m_context);
auto batchedBridgeValue = global.getProperty("__fbBatchedBridge");
// So here, if __fbBatchedBridge doesn't exist, then we know no native calls
// have happened, and we were able to determine this without forcing
// BatchedBridge to be loaded as a side effect.
if (!batchedBridgeValue.isUndefined()) {
// If calls were made, we bind to the JS bridge methods, and use them to
// get the pending queue of native calls.
bindBridge();
callNativeModules(m_flushedQueueJS->callAsFunction({}));
} else if (m_delegate) {
// If we have a delegate, we need to call it; we pass a null list to
// callNativeModules, since we know there are no native calls, without
// calling into JS again. If no calls were made and there's no delegate,
// nothing happens, which is correct.
callNativeModules(Value::makeNull(m_context));
}
}
void JSCExecutor::callFunction(const std::string& moduleId, const std::string& methodId, const folly::dynamic& arguments) {
SystraceSection s("JSCExecutor::callFunction");
// This weird pattern is because Value is not default constructible.
// The lambda is inlined, so there's no overhead.
auto result = [&] {
try {
if (!m_callFunctionReturnResultAndFlushedQueueJS) {
bindBridge();
}
return m_callFunctionReturnFlushedQueueJS->callAsFunction({
Value(m_context, String::createExpectingAscii(m_context, moduleId)),
Value(m_context, String::createExpectingAscii(m_context, methodId)),
Value::fromDynamic(m_context, std::move(arguments))
});
} catch (...) {
std::throw_with_nested(
std::runtime_error("Error calling " + moduleId + "." + methodId));
}
}();
callNativeModules(std::move(result));
}
void JSCExecutor::invokeCallback(const double callbackId, const folly::dynamic& arguments) {
SystraceSection s("JSCExecutor::invokeCallback");
auto result = [&] {
try {
if (!m_invokeCallbackAndReturnFlushedQueueJS) {
bindBridge();
}
return m_invokeCallbackAndReturnFlushedQueueJS->callAsFunction({
Value::makeNumber(m_context, callbackId),
Value::fromDynamic(m_context, std::move(arguments))
});
} catch (...) {
std::throw_with_nested(
std::runtime_error(folly::to<std::string>("Error invoking callback ", callbackId)));
}
}();
callNativeModules(std::move(result));
}
Value JSCExecutor::callFunctionSyncWithValue(
const std::string& module, const std::string& method, Value args) {
SystraceSection s("JSCExecutor::callFunction");
if (!m_callFunctionReturnResultAndFlushedQueueJS) {
bindBridge();
}
Object result = m_callFunctionReturnResultAndFlushedQueueJS->callAsFunction({
Value(m_context, String::createExpectingAscii(m_context, module)),
Value(m_context, String::createExpectingAscii(m_context, method)),
std::move(args),
}).asObject();
Value length = result.getProperty("length");
if (!length.isNumber() || length.asInteger() != 2) {
std::runtime_error("Return value of a callFunction must be an array of size 2");
}
callNativeModules(result.getPropertyAtIndex(1));
return result.getPropertyAtIndex(0);
}
void JSCExecutor::setGlobalVariable(std::string propName, std::unique_ptr<const JSBigString> jsonValue) {
try {
SystraceSection s("JSCExecutor.setGlobalVariable",
"propName", propName);
auto valueToInject = Value::fromJSON(m_context, jsStringFromBigString(m_context, *jsonValue));
Object::getGlobalObject(m_context).setProperty(propName.c_str(), valueToInject);
} catch (...) {
std::throw_with_nested(std::runtime_error("Error setting global variable: " + propName));
}
}
void* JSCExecutor::getJavaScriptContext() {
return m_context;
}
bool JSCExecutor::supportsProfiling() {
#ifdef WITH_FBSYSTRACE
return true;
#else
return false;
#endif
}
void JSCExecutor::startProfiler(const std::string &titleString) {
#ifdef WITH_JSC_EXTRA_TRACING
String title(m_context, titleString.c_str());
#if WITH_REACT_INTERNAL_SETTINGS
JSStartProfiling(m_context, title, false);
#else
JSStartProfiling(m_context, title);
#endif
#endif
}
void JSCExecutor::stopProfiler(const std::string &titleString, const std::string& filename) {
#ifdef WITH_JSC_EXTRA_TRACING
String title(m_context, titleString.c_str());
facebook::react::stopAndOutputProfilingFile(m_context, title, filename.c_str());
#endif
}
void JSCExecutor::handleMemoryPressureUiHidden() {
#ifdef WITH_JSC_MEMORY_PRESSURE
JSHandleMemoryPressure(this, m_context, JSMemoryPressure::UI_HIDDEN);
#endif
}
void JSCExecutor::handleMemoryPressureModerate() {
#ifdef WITH_JSC_MEMORY_PRESSURE
JSHandleMemoryPressure(this, m_context, JSMemoryPressure::MODERATE);
#endif
}
void JSCExecutor::handleMemoryPressureCritical() {
#ifdef WITH_JSC_MEMORY_PRESSURE
JSHandleMemoryPressure(this, m_context, JSMemoryPressure::CRITICAL);
#endif
}
void JSCExecutor::flushQueueImmediate(Value&& queue) {
auto queueStr = queue.toJSONString();
m_delegate->callNativeModules(*this, folly::parseJson(queueStr), false);
}
void JSCExecutor::loadModule(uint32_t moduleId) {
auto module = m_unbundle->getModule(moduleId);
auto sourceUrl = String::createExpectingAscii(m_context, module.name);
auto source = String::createExpectingAscii(m_context, module.code);
evaluateScript(m_context, source, sourceUrl);
}
int JSCExecutor::addWebWorker(
std::string scriptURL,
JSValueRef workerRef,
JSValueRef globalObjRef) {
static std::atomic_int nextWorkerId(1);
int workerId = nextWorkerId++;
Object globalObj = Value(m_context, globalObjRef).asObject();
auto workerJscConfig = m_jscConfig;
workerJscConfig["isWebWorker"] = true;
std::shared_ptr<MessageQueueThread> workerMQT =
WebWorkerUtil::createWebWorkerThread(workerId, m_messageQueueThread.get());
std::unique_ptr<JSCExecutor> worker;
workerMQT->runOnQueueSync([this, &worker, &workerMQT, &scriptURL, &globalObj, workerId, &workerJscConfig] () {
worker.reset(new JSCExecutor(m_delegate, workerMQT, workerId, this, std::move(scriptURL),
globalObj.toJSONMap(), workerJscConfig));
});
Object workerObj = Value(m_context, workerRef).asObject();
workerObj.makeProtected();
JSCExecutor *workerPtr = worker.get();
std::shared_ptr<MessageQueueThread> sharedMessageQueueThread = worker->m_messageQueueThread;
m_delegate->registerExecutor(
std::move(worker),
std::move(sharedMessageQueueThread));
m_ownedWorkers.emplace(
std::piecewise_construct,
std::forward_as_tuple(workerId),
std::forward_as_tuple(workerPtr, std::move(workerObj)));
return workerId;
}
void JSCExecutor::postMessageToOwnedWebWorker(int workerId, JSValueRef message) {
auto worker = m_ownedWorkers.at(workerId).executor;
std::string msgString = Value(m_context, message).toJSONString();
std::shared_ptr<bool> isWorkerDestroyed = worker->m_isDestroyed;
worker->m_messageQueueThread->runOnQueue([isWorkerDestroyed, worker, msgString] () {
if (*isWorkerDestroyed) {
return;
}
worker->receiveMessageFromOwner(msgString);
});
}
void JSCExecutor::postMessageToOwner(JSValueRef msg) {
std::string msgString = Value(m_context, msg).toJSONString();
std::shared_ptr<bool> ownerIsDestroyed = m_owner->m_isDestroyed;
m_owner->m_messageQueueThread->runOnQueue([workerId=m_workerId, owner=m_owner, ownerIsDestroyed, msgString] () {
if (*ownerIsDestroyed) {
return;
}
owner->receiveMessageFromOwnedWebWorker(workerId, msgString);
});
}
void JSCExecutor::receiveMessageFromOwnedWebWorker(int workerId, const std::string& json) {
Object* workerObj;
try {
workerObj = &m_ownedWorkers.at(workerId).jsObj;
} catch (std::out_of_range& e) {
// Worker was already terminated
return;
}
Value onmessageValue = workerObj->getProperty("onmessage");
if (onmessageValue.isUndefined()) {
return;
}
JSValueRef args[] = { createMessageObject(json) };
onmessageValue.asObject().callAsFunction(1, args);
flush();
}
void JSCExecutor::receiveMessageFromOwner(const std::string& msgString) {
CHECK(m_owner) << "Received message in a Executor that doesn't have an owner!";
JSValueRef args[] = { createMessageObject(msgString) };
Value onmessageValue = Object::getGlobalObject(m_context).getProperty("onmessage");
onmessageValue.asObject().callAsFunction(1, args);
}
void JSCExecutor::terminateOwnedWebWorker(int workerId) {
auto& workerRegistration = m_ownedWorkers.at(workerId);
std::shared_ptr<MessageQueueThread> workerMQT = workerRegistration.executor->m_messageQueueThread;
m_ownedWorkers.erase(workerId);
workerMQT->runOnQueueSync([this, &workerMQT] {
workerMQT->quitSynchronous();
std::unique_ptr<JSExecutor> worker = m_delegate->unregisterExecutor(*this);
worker->destroy();
worker.reset();
});
}
Object JSCExecutor::createMessageObject(const std::string& msgJson) {
Value rebornJSMsg = Value::fromJSON(m_context, String(m_context, msgJson.c_str()));
Object messageObject = Object::create(m_context);
messageObject.setProperty("data", rebornJSMsg);
return messageObject;
}
// Native JS hooks
template<JSValueRef (JSCExecutor::*method)(size_t, const JSValueRef[])>
void JSCExecutor::installNativeHook(const char* name) {
installGlobalFunction(m_context, name, exceptionWrapMethod<method>());
}
JSValueRef JSCExecutor::getNativeModule(JSObjectRef object, JSStringRef propertyName) {
if (JSC_JSStringIsEqualToUTF8CString(m_context, propertyName, "name")) {
return Value(m_context, String(m_context, "NativeModules"));
}
return m_nativeModules.getModule(m_context, propertyName);
}
JSValueRef JSCExecutor::nativePostMessage(
size_t argumentCount,
const JSValueRef arguments[]) {
if (argumentCount != 1) {
throw std::invalid_argument("Got wrong number of args");
}
JSValueRef msg = arguments[0];
postMessageToOwner(msg);
return Value::makeUndefined(m_context);
}
JSValueRef JSCExecutor::nativeRequire(
size_t argumentCount,
const JSValueRef arguments[]) {
if (argumentCount != 1) {
throw std::invalid_argument("Got wrong number of args");
}
double moduleId = Value(m_context, arguments[0]).asNumber();
if (moduleId <= 0) {
throw std::invalid_argument(folly::to<std::string>("Received invalid module ID: ",
Value(m_context, arguments[0]).toString().str()));
}
loadModule(moduleId);
return Value::makeUndefined(m_context);
}
JSValueRef JSCExecutor::nativeFlushQueueImmediate(
size_t argumentCount,
const JSValueRef arguments[]) {
if (argumentCount != 1) {
throw std::invalid_argument("Got wrong number of args");
}
flushQueueImmediate(Value(m_context, arguments[0]));
return Value::makeUndefined(m_context);
}
JSValueRef JSCExecutor::nativeStartWorker(
size_t argumentCount,
const JSValueRef arguments[]) {
if (argumentCount != 3) {
throw std::invalid_argument("Got wrong number of args");
}
std::string scriptFile = Value(m_context, arguments[0]).toString().str();
JSValueRef worker = arguments[1];
JSValueRef globalObj = arguments[2];
int workerId = addWebWorker(scriptFile, worker, globalObj);
return Value::makeNumber(m_context, workerId);
}
JSValueRef JSCExecutor::nativePostMessageToWorker(
size_t argumentCount,
const JSValueRef arguments[]) {
if (argumentCount != 2) {
throw std::invalid_argument("Got wrong number of args");
}
double workerDouble = Value(m_context, arguments[0]).asNumber();
if (workerDouble != workerDouble) {
throw std::invalid_argument("Got invalid worker id");
}
postMessageToOwnedWebWorker((int) workerDouble, arguments[1]);
return Value::makeUndefined(m_context);
}
JSValueRef JSCExecutor::nativeTerminateWorker(
size_t argumentCount,
const JSValueRef arguments[]) {
if (argumentCount != 1) {
throw std::invalid_argument("Got wrong number of args");
}
double workerDouble = Value(m_context, arguments[0]).asNumber();
if (workerDouble != workerDouble) {
std::invalid_argument("Got invalid worker id");
}
terminateOwnedWebWorker((int) workerDouble);
return Value::makeUndefined(m_context);
}
JSValueRef JSCExecutor::nativeCallSyncHook(
size_t argumentCount,
const JSValueRef arguments[]) {
if (argumentCount != 3) {
throw std::invalid_argument("Got wrong number of args");
}
unsigned int moduleId = Value(m_context, arguments[0]).asUnsignedInteger();
unsigned int methodId = Value(m_context, arguments[1]).asUnsignedInteger();
folly::dynamic args = folly::parseJson(Value(m_context, arguments[2]).toJSONString());
if (!args.isArray()) {
throw std::invalid_argument(
folly::to<std::string>("method parameters should be array, but are ", args.typeName()));
}
MethodCallResult result = m_delegate->callSerializableNativeHook(
*this,
moduleId,
methodId,
std::move(args));
if (!result.hasValue()) {
return Value::makeUndefined(m_context);
}
return Value::fromDynamic(m_context, result.value());
}
} }
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