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react-native/React/Executors/RCTJSCExecutor.mm

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTJSCExecutor.h"
#import <cinttypes>
#import <memory>
#import <pthread.h>
#import <string>
#import <unordered_map>
#import <UIKit/UIDevice.h>
#import <cxxreact/JSBundleType.h>
#import <jschelpers/JavaScriptCore.h>
#import <React/RCTAssert.h>
#import <React/RCTBridge+Private.h>
#import <React/RCTDefines.h>
#import <React/RCTDevSettings.h>
#import <React/RCTJSCErrorHandling.h>
#import <React/RCTJavaScriptLoader.h>
#import <React/RCTLog.h>
#import <React/RCTPerformanceLogger.h>
#import <React/RCTProfile.h>
#import <React/RCTUtils.h>
#if (RCT_PROFILE || RCT_DEV) && __has_include("RCTDevMenu.h")
#import "RCTDevMenu.h"
#endif
NSString *const RCTJSCThreadName = @"com.facebook.react.JavaScript";
NSString *const RCTJavaScriptContextCreatedNotification = @"RCTJavaScriptContextCreatedNotification";
struct __attribute__((packed)) ModuleData {
uint32_t offset;
uint32_t size;
};
using file_ptr = std::unique_ptr<FILE, decltype(&fclose)>;
using memory_ptr = std::unique_ptr<void, decltype(&free)>;
struct RandomAccessBundleData {
file_ptr bundle;
size_t baseOffset;
size_t numTableEntries;
std::unique_ptr<ModuleData[]> table;
RandomAccessBundleData(): bundle(nullptr, fclose) {}
};
struct RandomAccessBundleStartupCode {
memory_ptr code;
size_t size;
static RandomAccessBundleStartupCode empty() {
return RandomAccessBundleStartupCode{memory_ptr(nullptr, free), 0};
};
bool isEmpty() {
return !code;
}
};
struct TaggedScript {
const facebook::react::ScriptTag tag;
const NSData *script;
};
#if RCT_PROFILE
@interface RCTCookieMap : NSObject
{
@package
std::unordered_map<NSUInteger, NSUInteger> _cookieMap;
}
@end
@implementation RCTCookieMap @end
#endif
struct RCTJSContextData {
BOOL useCustomJSCLibrary;
NSThread *javaScriptThread;
JSContext *context;
};
@interface RCTJavaScriptContext : NSObject <RCTInvalidating>
@property (nonatomic, strong, readonly) JSContext *context;
- (instancetype)initWithJSContext:(JSContext *)context
onThread:(NSThread *)javaScriptThread NS_DESIGNATED_INITIALIZER;
@end
@implementation RCTJavaScriptContext
{
RCTJavaScriptContext *_selfReference;
NSThread *_javaScriptThread;
}
- (instancetype)initWithJSContext:(JSContext *)context
onThread:(NSThread *)javaScriptThread
{
if ((self = [super init])) {
_context = context;
_context.name = @"RCTJSContext";
_javaScriptThread = javaScriptThread;
/**
* Explicitly introduce a retain cycle here - The RCTJSCExecutor might
* be deallocated while there's still work enqueued in the JS thread, so
* we wouldn't be able kill the JSContext. Instead we create this retain
* cycle, and enqueue the -invalidate message in this object, it then
* releases the JSContext, breaks the cycle and stops the runloop.
*/
_selfReference = self;
}
return self;
}
RCT_NOT_IMPLEMENTED(-(instancetype)init)
- (BOOL)isValid
{
return _context != nil;
}
- (void)invalidate
{
if (self.isValid) {
RCTAssertThread(_javaScriptThread, @"Must be invalidated on JS thread.");
_context = nil;
_selfReference = nil;
_javaScriptThread = nil;
CFRunLoopStop([[NSRunLoop currentRunLoop] getCFRunLoop]);
}
}
@end
@implementation RCTJSCExecutor
{
// Set at init time:
BOOL _useCustomJSCLibrary;
NSThread *_javaScriptThread;
// Set at setUp time:
RCTPerformanceLogger *_performanceLogger;
RCTJavaScriptContext *_context;
// Set as needed:
RandomAccessBundleData _randomAccessBundle;
JSValueRef _batchedBridgeRef;
}
@synthesize valid = _valid;
@synthesize bridge = _bridge;
RCT_EXPORT_MODULE()
+ (void)runRunLoopThread
{
@autoreleasepool {
// copy thread name to pthread name
pthread_setname_np([NSThread currentThread].name.UTF8String);
// Set up a dummy runloop source to avoid spinning
CFRunLoopSourceContext noSpinCtx = {0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL};
CFRunLoopSourceRef noSpinSource = CFRunLoopSourceCreate(NULL, 0, &noSpinCtx);
CFRunLoopAddSource(CFRunLoopGetCurrent(), noSpinSource, kCFRunLoopDefaultMode);
CFRelease(noSpinSource);
// run the run loop
while (kCFRunLoopRunStopped != CFRunLoopRunInMode(kCFRunLoopDefaultMode, ((NSDate *)[NSDate distantFuture]).timeIntervalSinceReferenceDate, NO)) {
RCTAssert(NO, @"not reached assertion"); // runloop spun. that's bad.
}
}
}
static NSThread *newJavaScriptThread(void)
{
NSThread *javaScriptThread = [[NSThread alloc] initWithTarget:[RCTJSCExecutor class]
selector:@selector(runRunLoopThread)
object:nil];
javaScriptThread.name = RCTJSCThreadName;
javaScriptThread.qualityOfService = NSOperationQualityOfServiceUserInteractive;
[javaScriptThread start];
return javaScriptThread;
}
- (void)setBridge:(RCTBridge *)bridge
{
_bridge = bridge;
_performanceLogger = [bridge performanceLogger];
}
- (instancetype)init
{
return [self initWithUseCustomJSCLibrary:NO];
}
- (instancetype)initWithUseCustomJSCLibrary:(BOOL)useCustomJSCLibrary
{
RCT_PROFILE_BEGIN_EVENT(0, @"-[RCTJSCExecutor init]", nil);
if (self = [super init]) {
_useCustomJSCLibrary = useCustomJSCLibrary;
_valid = YES;
_javaScriptThread = newJavaScriptThread();
}
RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"");
return self;
}
- (instancetype)initWithJSContextData:(const RCTJSContextData &)data
{
if (self = [super init]) {
_useCustomJSCLibrary = data.useCustomJSCLibrary;
_valid = YES;
_javaScriptThread = data.javaScriptThread;
_context = [[RCTJavaScriptContext alloc] initWithJSContext:data.context onThread:_javaScriptThread];
}
return self;
}
- (NSError *)synchronouslyExecuteApplicationScript:(NSData *)script
sourceURL:(NSURL *)sourceURL
{
NSError *loadError;
TaggedScript taggedScript = loadTaggedScript(script, sourceURL, _performanceLogger, _randomAccessBundle, &loadError);
if (loadError) {
return loadError;
}
if (taggedScript.tag == facebook::react::ScriptTag::RAMBundle) {
registerNativeRequire(_context.context, self);
}
return executeApplicationScript(taggedScript, sourceURL,
_performanceLogger,
_context.context.JSGlobalContextRef);
}
- (RCTJavaScriptContext *)context
{
if (!self.isValid) {
return nil;
}
return _context;
}
- (void)setUp
{
#if RCT_PROFILE
#ifndef __clang_analyzer__
_bridge.flowIDMap = CFDictionaryCreateMutable(NULL, 0, NULL, NULL);
#endif
_bridge.flowIDMapLock = [NSLock new];
for (NSString *event in @[RCTProfileDidStartProfiling, RCTProfileDidEndProfiling]) {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(toggleProfilingFlag:)
name:event
object:nil];
}
#endif
[self executeBlockOnJavaScriptQueue:^{
if (!self.valid) {
return;
}
JSGlobalContextRef contextRef = nullptr;
JSContext *context = nil;
if (self->_context) {
context = self->_context.context;
contextRef = context.JSGlobalContextRef;
} else {
if (self->_useCustomJSCLibrary) {
JSC_configureJSCForIOS(true, RCTJSONStringify(@{
@"StartSamplingProfilerOnInit": @(self->_bridge.devSettings.startSamplingProfilerOnLaunch)
}, NULL).UTF8String);
}
contextRef = JSC_JSGlobalContextCreateInGroup((bool)self->_useCustomJSCLibrary, nullptr, nullptr);
context = [JSC_JSContext(contextRef) contextWithJSGlobalContextRef:contextRef];
// We release the global context reference here to balance retainCount after JSGlobalContextCreateInGroup.
// The global context _is not_ going to be released since the JSContext keeps the strong reference to it.
JSC_JSGlobalContextRelease(contextRef);
self->_context = [[RCTJavaScriptContext alloc] initWithJSContext:context onThread:self->_javaScriptThread];
[[NSNotificationCenter defaultCenter] postNotificationName:RCTJavaScriptContextCreatedNotification
object:context];
installBasicSynchronousHooksOnContext(context);
}
RCTFBQuickPerformanceLoggerConfigureHooks(context.JSGlobalContextRef);
__weak RCTJSCExecutor *weakSelf = self;
context[@"nativeRequireModuleConfig"] = ^NSArray *(NSString *moduleName) {
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf.valid) {
return nil;
}
RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"nativeRequireModuleConfig", @{ @"moduleName": moduleName });
NSArray *result = [strongSelf->_bridge configForModuleName:moduleName];
RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"js_call,config");
return RCTNullIfNil(result);
};
context[@"nativeFlushQueueImmediate"] = ^(NSArray<NSArray *> *calls){
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf.valid || !calls) {
return;
}
RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"nativeFlushQueueImmediate", nil);
[strongSelf->_bridge handleBuffer:calls batchEnded:NO];
RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"js_call");
};
context[@"nativeCallSyncHook"] = ^id(NSUInteger module, NSUInteger method, NSArray *args) {
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf.valid) {
return nil;
}
RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, @"nativeCallSyncHook", nil);
id result = [strongSelf->_bridge callNativeModule:module method:method params:args];
RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"js_call,config");
return result;
};
#if RCT_PROFILE
__weak RCTBridge *weakBridge = self->_bridge;
context[@"nativeTraceBeginAsyncFlow"] = ^(__unused uint64_t tag, __unused NSString *name, int64_t cookie) {
if (RCTProfileIsProfiling()) {
[weakBridge.flowIDMapLock lock];
NSUInteger newCookie = _RCTProfileBeginFlowEvent();
CFDictionarySetValue(weakBridge.flowIDMap, (const void *)cookie, (const void *)newCookie);
[weakBridge.flowIDMapLock unlock];
}
};
context[@"nativeTraceEndAsyncFlow"] = ^(__unused uint64_t tag, __unused NSString *name, int64_t cookie) {
if (RCTProfileIsProfiling()) {
[weakBridge.flowIDMapLock lock];
NSUInteger newCookie = (NSUInteger)CFDictionaryGetValue(weakBridge.flowIDMap, (const void *)cookie);
_RCTProfileEndFlowEvent(newCookie);
CFDictionaryRemoveValue(weakBridge.flowIDMap, (const void *)cookie);
[weakBridge.flowIDMapLock unlock];
}
};
// Add toggles for JSC's sampling profiler, if the profiler is enabled
if (JSC_JSSamplingProfilerEnabled(context.JSGlobalContextRef)) {
// Mark this thread as the main JS thread before starting profiling.
JSC_JSStartSamplingProfilingOnMainJSCThread(context.JSGlobalContextRef);
__weak JSContext *weakContext = self->_context.context;
#if __has_include("RCTDevMenu.h")
// Allow to toggle the sampling profiler through RN's dev menu
[self->_bridge.devMenu addItem:[RCTDevMenuItem buttonItemWithTitle:@"Start / Stop JS Sampling Profiler" handler:^{
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf.valid || !weakContext) {
return;
}
[weakSelf.bridge.devSettings toggleJSCSamplingProfiler];
}]];
#endif
// Allow for the profiler to be poked from JS code as well
// (see SamplingProfiler.js for an example of how it could be used with the JSCSamplingProfiler module).
context[@"pokeSamplingProfiler"] = ^NSDictionary *() {
if (!weakContext) {
return @{};
}
JSGlobalContextRef ctx = weakContext.JSGlobalContextRef;
JSValueRef result = JSC_JSPokeSamplingProfiler(ctx);
return [[JSC_JSValue(ctx) valueWithJSValueRef:result inContext:weakContext] toObject];
};
}
#endif
#if RCT_DEV
// Inject handler used by HMR
context[@"nativeInjectHMRUpdate"] = ^(NSString *sourceCode, NSString *sourceCodeURL) {
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf.valid) {
return;
}
JSGlobalContextRef ctx = strongSelf->_context.context.JSGlobalContextRef;
JSStringRef execJSString = JSC_JSStringCreateWithUTF8CString(ctx, sourceCode.UTF8String);
JSStringRef jsURL = JSC_JSStringCreateWithUTF8CString(ctx, sourceCodeURL.UTF8String);
JSC_JSEvaluateScript(ctx, execJSString, NULL, jsURL, 0, NULL);
JSC_JSStringRelease(ctx, jsURL);
JSC_JSStringRelease(ctx, execJSString);
};
#endif
}];
}
/** Installs synchronous hooks that don't require a weak reference back to the RCTJSCExecutor. */
static void installBasicSynchronousHooksOnContext(JSContext *context)
{
context[@"nativeLoggingHook"] = ^(NSString *message, NSNumber *logLevel) {
RCTLogLevel level = RCTLogLevelInfo;
if (logLevel) {
level = MAX(level, (RCTLogLevel)logLevel.integerValue);
}
_RCTLogJavaScriptInternal(level, message);
};
context[@"nativePerformanceNow"] = ^{
return @(CACurrentMediaTime() * 1000);
};
#if RCT_PROFILE
if (RCTProfileIsProfiling()) {
// Cheating, since it's not a "hook", but meh
context[@"__RCTProfileIsProfiling"] = @YES;
}
context[@"nativeTraceBeginSection"] = ^(NSNumber *tag, NSString *profileName, NSDictionary *args) {
static int profileCounter = 1;
if (!profileName) {
profileName = [NSString stringWithFormat:@"Profile %d", profileCounter++];
}
RCT_PROFILE_BEGIN_EVENT(tag.longLongValue, profileName, args);
};
context[@"nativeTraceEndSection"] = ^(NSNumber *tag) {
RCT_PROFILE_END_EVENT(tag.longLongValue, @"console");
};
RCTCookieMap *cookieMap = [RCTCookieMap new];
context[@"nativeTraceBeginAsyncSection"] = ^(uint64_t tag, NSString *name, NSUInteger cookie) {
NSUInteger newCookie = RCTProfileBeginAsyncEvent(tag, name, nil);
cookieMap->_cookieMap.insert({cookie, newCookie});
};
context[@"nativeTraceEndAsyncSection"] = ^(uint64_t tag, NSString *name, NSUInteger cookie) {
NSUInteger newCookie = 0;
const auto &it = cookieMap->_cookieMap.find(cookie);
if (it != cookieMap->_cookieMap.end()) {
newCookie = it->second;
cookieMap->_cookieMap.erase(it);
}
RCTProfileEndAsyncEvent(tag, @"js,async", newCookie, name, @"JS async");
};
#endif
}
- (void)toggleProfilingFlag:(NSNotification *)notification
{
[self executeBlockOnJavaScriptQueue:^{
BOOL enabled = [notification.name isEqualToString:RCTProfileDidStartProfiling];
[self->_bridge enqueueJSCall:@"Systrace"
method:@"setEnabled"
args:@[enabled ? @YES : @NO]
completion:NULL];
}];
}
- (void)invalidate
{
if (!self.isValid) {
return;
}
_valid = NO;
#if RCT_PROFILE
[[NSNotificationCenter defaultCenter] removeObserver:self];
#endif
}
- (int32_t)bytecodeFileFormatVersion
{
return _useCustomJSCLibrary
? facebook::react::customJSCWrapper()->JSBytecodeFileFormatVersion
: JSNoBytecodeFileFormatVersion;
}
- (NSString *)contextName
{
return [_context.context name];
}
RCT_EXPORT_METHOD(setContextName:(nonnull NSString *)contextName)
{
[_context.context setName:contextName];
}
- (void)dealloc
{
[self invalidate];
[_context performSelector:@selector(invalidate)
onThread:_javaScriptThread
withObject:nil
waitUntilDone:NO];
_context = nil;
_randomAccessBundle.bundle.reset();
_randomAccessBundle.table.reset();
}
- (void)flushedQueue:(RCTJavaScriptCallback)onComplete
{
// TODO: Make this function handle first class instead of dynamically dispatching it. #9317773
[self _executeJSCall:@"flushedQueue" arguments:@[] unwrapResult:YES callback:onComplete];
}
- (void)_callFunctionOnModule:(NSString *)module
method:(NSString *)method
arguments:(NSArray *)args
returnValue:(BOOL)returnValue
unwrapResult:(BOOL)unwrapResult
callback:(RCTJavaScriptCallback)onComplete
{
// TODO: Make this function handle first class instead of dynamically dispatching it. #9317773
NSString *bridgeMethod = returnValue ? @"callFunctionReturnFlushedQueue" : @"callFunctionReturnResultAndFlushedQueue";
[self _executeJSCall:bridgeMethod arguments:@[module, method, args] unwrapResult:unwrapResult callback:onComplete];
}
- (void)callFunctionOnModule:(NSString *)module method:(NSString *)method arguments:(NSArray *)args callback:(RCTJavaScriptCallback)onComplete
{
[self _callFunctionOnModule:module method:method arguments:args returnValue:YES unwrapResult:YES callback:onComplete];
}
- (void)callFunctionOnModule:(NSString *)module method:(NSString *)method arguments:(NSArray *)args jsValueCallback:(RCTJavaScriptValueCallback)onComplete
{
[self _callFunctionOnModule:module method:method arguments:args returnValue:NO unwrapResult:NO callback:onComplete];
}
- (void)invokeCallbackID:(NSNumber *)cbID
arguments:(NSArray *)args
callback:(RCTJavaScriptCallback)onComplete
{
// TODO: Make this function handle first class instead of dynamically dispatching it. #9317773
[self _executeJSCall:@"invokeCallbackAndReturnFlushedQueue" arguments:@[cbID, args] unwrapResult:YES callback:onComplete];
}
- (void)_executeJSCall:(NSString *)method
arguments:(NSArray *)arguments
unwrapResult:(BOOL)unwrapResult
callback:(RCTJavaScriptCallback)onComplete
{
RCTAssert(onComplete != nil, @"onComplete block should not be nil");
__weak RCTJSCExecutor *weakSelf = self;
[self executeBlockOnJavaScriptQueue:^{
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf || !strongSelf.isValid) {
return;
}
RCT_PROFILE_BEGIN_EVENT(0, @"executeJSCall", (@{@"method": method, @"args": arguments}));
JSContext *context = strongSelf->_context.context;
JSGlobalContextRef ctx = context.JSGlobalContextRef;
// get the BatchedBridge object
JSValueRef errorJSRef = NULL;
JSValueRef batchedBridgeRef = strongSelf->_batchedBridgeRef;
if (!batchedBridgeRef) {
JSStringRef moduleNameJSStringRef = JSC_JSStringCreateWithUTF8CString(ctx, "__fbBatchedBridge");
JSObjectRef globalObjectJSRef = JSC_JSContextGetGlobalObject(ctx);
batchedBridgeRef = JSC_JSObjectGetProperty(ctx, globalObjectJSRef, moduleNameJSStringRef, &errorJSRef);
JSC_JSStringRelease(ctx, moduleNameJSStringRef);
strongSelf->_batchedBridgeRef = batchedBridgeRef;
}
NSError *error;
JSValueRef resultJSRef = NULL;
if (batchedBridgeRef != NULL && errorJSRef == NULL && JSC_JSValueGetType(ctx, batchedBridgeRef) != kJSTypeUndefined) {
// get method
JSStringRef methodNameJSStringRef = JSC_JSStringCreateWithCFString(ctx, (__bridge CFStringRef)method);
JSValueRef methodJSRef = JSC_JSObjectGetProperty(ctx, (JSObjectRef)batchedBridgeRef, methodNameJSStringRef, &errorJSRef);
JSC_JSStringRelease(ctx, methodNameJSStringRef);
if (methodJSRef != NULL && errorJSRef == NULL && JSC_JSValueGetType(ctx, methodJSRef) != kJSTypeUndefined) {
JSValueRef jsArgs[arguments.count];
for (NSUInteger i = 0; i < arguments.count; i++) {
jsArgs[i] = [JSC_JSValue(ctx) valueWithObject:arguments[i] inContext:context].JSValueRef;
}
resultJSRef = JSC_JSObjectCallAsFunction(ctx, (JSObjectRef)methodJSRef, (JSObjectRef)batchedBridgeRef, arguments.count, jsArgs, &errorJSRef);
} else {
if (!errorJSRef && JSC_JSValueGetType(ctx, methodJSRef) == kJSTypeUndefined) {
error = RCTErrorWithMessage([NSString stringWithFormat:@"Unable to execute JS call: method %@ is undefined", method]);
}
}
} else {
if (!errorJSRef && JSC_JSValueGetType(ctx, batchedBridgeRef) == kJSTypeUndefined) {
error = RCTErrorWithMessage(@"Unable to execute JS call: __fbBatchedBridge is undefined");
}
}
id objcValue;
if (errorJSRef || error) {
if (!error) {
error = RCTNSErrorFromJSError([JSC_JSValue(ctx) valueWithJSValueRef:errorJSRef inContext:context]);
}
} else {
// We often return `null` from JS when there is nothing for native side. [JSValue toValue]
// returns [NSNull null] in this case, which we don't want.
if (JSC_JSValueGetType(ctx, resultJSRef) != kJSTypeNull) {
JSValue *result = [JSC_JSValue(ctx) valueWithJSValueRef:resultJSRef inContext:context];
objcValue = unwrapResult ? [result toObject] : result;
}
}
RCT_PROFILE_END_EVENT(0, @"js_call");
onComplete(objcValue, error);
}];
}
- (void)executeApplicationScript:(NSData *)script
sourceURL:(NSURL *)sourceURL
onComplete:(RCTJavaScriptCompleteBlock)onComplete
{
RCTAssertParam(script);
RCTAssertParam(sourceURL);
NSError *loadError;
TaggedScript taggedScript = loadTaggedScript(script, sourceURL,
_performanceLogger,
_randomAccessBundle,
&loadError);
if (!taggedScript.script) {
if (onComplete) {
onComplete(loadError);
}
return;
}
RCTProfileBeginFlowEvent();
[self executeBlockOnJavaScriptQueue:^{
RCTProfileEndFlowEvent();
if (!self.isValid) {
return;
}
if (taggedScript.tag == facebook::react::ScriptTag::RAMBundle) {
registerNativeRequire(self.context.context, self);
}
NSError *error = executeApplicationScript(taggedScript, sourceURL,
self->_performanceLogger,
self->_context.context.JSGlobalContextRef);
if (onComplete) {
onComplete(error);
}
}];
}
static TaggedScript loadTaggedScript(NSData *script,
NSURL *sourceURL,
RCTPerformanceLogger *performanceLogger,
RandomAccessBundleData &randomAccessBundle,
NSError **error)
{
RCT_PROFILE_BEGIN_EVENT(0, @"executeApplicationScript / prepare bundle", nil);
facebook::react::BundleHeader header;
[script getBytes:&header length:sizeof(header)];
facebook::react::ScriptTag tag = facebook::react::parseTypeFromHeader(header);
NSData *loadedScript = NULL;
switch (tag) {
case facebook::react::ScriptTag::RAMBundle:
[performanceLogger markStartForTag:RCTPLRAMBundleLoad];
loadedScript = loadRAMBundle(sourceURL, error, randomAccessBundle);
[performanceLogger markStopForTag:RCTPLRAMBundleLoad];
[performanceLogger setValue:loadedScript.length forTag:RCTPLRAMStartupCodeSize];
break;
case facebook::react::ScriptTag::BCBundle:
loadedScript = script;
break;
case facebook::react::ScriptTag::String: {
NSMutableData *nullTerminatedScript = [NSMutableData dataWithData:script];
[nullTerminatedScript appendBytes:"" length:1];
loadedScript = nullTerminatedScript;
}
}
RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"");
return { .tag = tag, .script = loadedScript };
}
static void registerNativeRequire(JSContext *context, RCTJSCExecutor *executor)
{
__weak RCTJSCExecutor *weakExecutor = executor;
context[@"nativeRequire"] = ^(NSNumber *moduleID) { [weakExecutor _nativeRequire:moduleID]; };
}
static NSError *executeApplicationScript(TaggedScript taggedScript,
NSURL *sourceURL,
RCTPerformanceLogger *performanceLogger,
JSGlobalContextRef ctx)
{
RCT_PROFILE_BEGIN_EVENT(0, @"executeApplicationScript / execute script", (@{
@"url": sourceURL.absoluteString, @"size": @(taggedScript.script.length)
}));
[performanceLogger markStartForTag:RCTPLScriptExecution];
JSValueRef jsError = NULL;
JSStringRef bundleURL = JSC_JSStringCreateWithUTF8CString(ctx, sourceURL.absoluteString.UTF8String);
switch (taggedScript.tag) {
case facebook::react::ScriptTag::RAMBundle:
/* fallthrough */
case facebook::react::ScriptTag::String: {
JSStringRef execJSString = JSC_JSStringCreateWithUTF8CString(ctx, (const char *)taggedScript.script.bytes);
JSC_JSEvaluateScript(ctx, execJSString, NULL, bundleURL, 0, &jsError);
JSC_JSStringRelease(ctx, execJSString);
break;
}
case facebook::react::ScriptTag::BCBundle: {
file_ptr source(fopen(sourceURL.path.UTF8String, "r"), fclose);
int sourceFD = fileno(source.get());
JSC_JSEvaluateBytecodeBundle(ctx, NULL, sourceFD, bundleURL, &jsError);
break;
}
}
JSC_JSStringRelease(ctx, bundleURL);
[performanceLogger markStopForTag:RCTPLScriptExecution];
NSError *error = jsError
? RCTNSErrorFromJSErrorRef(jsError, ctx)
: nil;
RCT_PROFILE_END_EVENT(0, @"js_call");
return error;
}
- (void)executeBlockOnJavaScriptQueue:(dispatch_block_t)block
{
if ([NSThread currentThread] != _javaScriptThread) {
[self performSelector:@selector(executeBlockOnJavaScriptQueue:)
onThread:_javaScriptThread withObject:block waitUntilDone:NO];
} else {
block();
}
}
- (void)executeAsyncBlockOnJavaScriptQueue:(dispatch_block_t)block
{
[self performSelector:@selector(executeBlockOnJavaScriptQueue:)
onThread:_javaScriptThread
withObject:block
waitUntilDone:NO];
}
- (void)injectJSONText:(NSString *)script
asGlobalObjectNamed:(NSString *)objectName
callback:(RCTJavaScriptCompleteBlock)onComplete
{
if (RCT_DEBUG) {
RCTAssert(RCTJSONParse(script, NULL) != nil, @"%@ wasn't valid JSON!", script);
}
__weak RCTJSCExecutor *weakSelf = self;
RCTProfileBeginFlowEvent();
[self executeBlockOnJavaScriptQueue:^{
RCTProfileEndFlowEvent();
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf || !strongSelf.isValid) {
return;
}
RCT_PROFILE_BEGIN_EVENT(0, @"injectJSONText", @{@"objectName": objectName});
JSGlobalContextRef ctx = strongSelf->_context.context.JSGlobalContextRef;
JSStringRef execJSString = JSC_JSStringCreateWithCFString(ctx, (__bridge CFStringRef)script);
JSValueRef valueToInject = JSC_JSValueMakeFromJSONString(ctx, execJSString);
JSC_JSStringRelease(ctx, execJSString);
NSError *error;
if (!valueToInject) {
NSString *errorMessage = [NSString stringWithFormat:@"Can't make JSON value from script '%@'", script];
error = [NSError errorWithDomain:RCTErrorDomain code:2 userInfo:@{NSLocalizedDescriptionKey: errorMessage}];
RCTLogError(@"%@", errorMessage);
} else {
JSObjectRef globalObject = JSC_JSContextGetGlobalObject(ctx);
JSStringRef JSName = JSC_JSStringCreateWithCFString(ctx, (__bridge CFStringRef)objectName);
JSValueRef jsError = NULL;
JSC_JSObjectSetProperty(ctx, globalObject, JSName, valueToInject, kJSPropertyAttributeNone, &jsError);
JSC_JSStringRelease(ctx, JSName);
if (jsError) {
error = RCTNSErrorFromJSErrorRef(jsError, ctx);
}
}
RCT_PROFILE_END_EVENT(0, @"js_call,json_call");
if (onComplete) {
onComplete(error);
}
}];
}
static bool readRandomAccessModule(const RandomAccessBundleData &bundleData, size_t offset, size_t size, char *data)
{
return fseek(bundleData.bundle.get(), offset + bundleData.baseOffset, SEEK_SET) == 0 &&
fread(data, 1, size, bundleData.bundle.get()) == size;
}
static void executeRandomAccessModule(RCTJSCExecutor *executor, uint32_t moduleID, size_t offset, size_t size)
{
auto data = std::make_unique<char[]>(size);
if (!readRandomAccessModule(executor->_randomAccessBundle, offset, size, data.get())) {
RCTFatal(RCTErrorWithMessage(@"Error loading RAM module"));
return;
}
char url[14]; // 10 = maximum decimal digits in a 32bit unsigned int + ".js" + null byte
sprintf(url, "%" PRIu32 ".js", moduleID);
JSGlobalContextRef ctx = executor->_context.context.JSGlobalContextRef;
JSStringRef code = JSC_JSStringCreateWithUTF8CString(ctx, data.get());
JSValueRef jsError = NULL;
JSStringRef sourceURL = JSC_JSStringCreateWithUTF8CString(ctx, url);
JSValueRef result = JSC_JSEvaluateScript(ctx, code, NULL, sourceURL, 0, &jsError);
JSC_JSStringRelease(ctx, code);
JSC_JSStringRelease(ctx, sourceURL);
if (!result) {
NSError *error = RCTNSErrorFromJSErrorRef(jsError, ctx);
dispatch_async(dispatch_get_main_queue(), ^{
RCTFatal(error);
[executor invalidate];
});
}
}
- (void)_nativeRequire:(NSNumber *)moduleID
{
if (!moduleID) {
return;
}
[_performanceLogger addValue:1 forTag:RCTPLRAMNativeRequiresCount];
[_performanceLogger appendStartForTag:RCTPLRAMNativeRequires];
RCT_PROFILE_BEGIN_EVENT(RCTProfileTagAlways, ([@"nativeRequire_" stringByAppendingFormat:@"%@", moduleID]), nil);
const uint32_t ID = [moduleID unsignedIntValue];
if (ID < _randomAccessBundle.numTableEntries) {
ModuleData *moduleData = &_randomAccessBundle.table[ID];
const uint32_t size = NSSwapLittleIntToHost(moduleData->size);
// sparse entry in the table -- module does not exist or is contained in the startup section
if (size == 0) {
return;
}
executeRandomAccessModule(self, ID, NSSwapLittleIntToHost(moduleData->offset), size);
}
RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"js_call");
[_performanceLogger appendStopForTag:RCTPLRAMNativeRequires];
}
static RandomAccessBundleStartupCode readRAMBundle(file_ptr bundle, RandomAccessBundleData &randomAccessBundle)
{
// read in magic header, number of entries, and length of the startup section
uint32_t header[3];
if (fread(&header, 1, sizeof(header), bundle.get()) != sizeof(header)) {
return RandomAccessBundleStartupCode::empty();
}
const size_t numTableEntries = NSSwapLittleIntToHost(header[1]);
const size_t startupCodeSize = NSSwapLittleIntToHost(header[2]);
const size_t tableSize = numTableEntries * sizeof(ModuleData);
// allocate memory for meta data and lookup table. malloc instead of new to avoid constructor calls
auto table = std::make_unique<ModuleData[]>(numTableEntries);
if (!table) {
return RandomAccessBundleStartupCode::empty();
}
// read the lookup table from the file
if (fread(table.get(), 1, tableSize, bundle.get()) != tableSize) {
return RandomAccessBundleStartupCode::empty();
}
// read the startup code
memory_ptr code(malloc(startupCodeSize), free);
if (!code || fread(code.get(), 1, startupCodeSize, bundle.get()) != startupCodeSize) {
return RandomAccessBundleStartupCode::empty();
}
randomAccessBundle.bundle = std::move(bundle);
randomAccessBundle.baseOffset = sizeof(header) + tableSize;
randomAccessBundle.numTableEntries = numTableEntries;
randomAccessBundle.table = std::move(table);
return {std::move(code), startupCodeSize};
}
static NSData *loadRAMBundle(NSURL *sourceURL, NSError **error, RandomAccessBundleData &randomAccessBundle)
{
file_ptr bundle(fopen(sourceURL.path.UTF8String, "r"), fclose);
if (!bundle) {
if (error) {
*error = RCTErrorWithMessage([NSString stringWithFormat:@"Bundle %@ cannot be opened: %d", sourceURL.path, errno]);
}
return nil;
}
auto startupCode = readRAMBundle(std::move(bundle), randomAccessBundle);
if (startupCode.isEmpty()) {
if (error) {
*error = RCTErrorWithMessage(@"Error loading RAM Bundle");
}
return nil;
}
return [NSData dataWithBytesNoCopy:startupCode.code.release() length:startupCode.size freeWhenDone:YES];
}
- (JSContext *)jsContext
{
return [self context].context;
}
@end
@implementation RCTJSContextProvider
{
dispatch_semaphore_t _semaphore;
NSThread *_javaScriptThread;
JSContext *_context;
}
- (instancetype)initWithUseCustomJSCLibrary:(BOOL)useCustomJSCLibrary
{
if (self = [super init]) {
_semaphore = dispatch_semaphore_create(0);
_useCustomJSCLibrary = useCustomJSCLibrary;
_javaScriptThread = newJavaScriptThread();
[self performSelector:@selector(_createContext) onThread:_javaScriptThread withObject:nil waitUntilDone:NO];
}
return self;
}
- (void)_createContext
{
if (_useCustomJSCLibrary) {
JSC_configureJSCForIOS(true, "{}");
}
JSGlobalContextRef ctx = JSC_JSGlobalContextCreateInGroup((bool)_useCustomJSCLibrary, nullptr, nullptr);
_context = [JSC_JSContext(ctx) contextWithJSGlobalContextRef:ctx];
installBasicSynchronousHooksOnContext(_context);
dispatch_semaphore_signal(_semaphore);
}
- (RCTJSContextData)data
{
// Be sure this method is only called once, otherwise it will hang here forever:
dispatch_semaphore_wait(_semaphore, DISPATCH_TIME_FOREVER);
return {
.useCustomJSCLibrary = _useCustomJSCLibrary,
.javaScriptThread = _javaScriptThread,
.context = _context,
};
}
- (RCTJSCExecutor *)createExecutorWithContext:(JSContext **)JSContext
{
const RCTJSContextData data = self.data;
if (JSContext) {
*JSContext = data.context;
}
return [[RCTJSCExecutor alloc] initWithJSContextData:data];
}
@end
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