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react-native/React/Executors/RCTJSCExecutor.mm
Pieter De Baets e1577df1fd Move all header imports to "<React/..>" 
Summary:
To make React Native play nicely with our internal build infrastructure we need to properly namespace all of our header includes.

Where previously you could do `#import "RCTBridge.h"`, you must now write this as `#import <React/RCTBridge.h>`. If your xcode project still has a custom header include path, both variants will likely continue to work, but for new projects, we're defaulting the header include path to `$(BUILT_PRODUCTS_DIR)/usr/local/include`, where the React and CSSLayout targets will copy a subset of headers too. To make Xcode copy headers phase work properly, you may need to add React as an explicit dependency to your app's scheme and disable "parallelize build".

Reviewed By: mmmulani

Differential Revision: D4213120

fbshipit-source-id: 84a32a4b250c27699e6795f43584f13d594a9a82
2016-11-23 07:58:39 -08:00

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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 "JSCSamplingProfiler.h"
#import "RCTAssert.h"
#import "RCTBridge+Private.h"
#import "RCTDefines.h"
#import "RCTDevMenu.h"
#import "RCTJSCErrorHandling.h"
#import "RCTJSCProfiler.h"
#import "RCTJSCWrapper.h"
#import "RCTJavaScriptLoader.h"
#import "RCTLog.h"
#import "RCTPerformanceLogger.h"
#import "RCTProfile.h"
#import "RCTUtils.h"
NSString *const RCTJSCThreadName = @"com.facebook.react.JavaScript";
NSString *const RCTJavaScriptContextCreatedNotification = @"RCTJavaScriptContextCreatedNotification";
RCT_EXTERN NSString *const RCTFBJSContextClassKey = @"_RCTFBJSContextClassKey";
RCT_EXTERN NSString *const RCTFBJSValueClassKey = @"_RCTFBJSValueClassKey";
static NSString *const RCTJSCProfilerEnabledDefaultsKey = @"RCTJSCProfilerEnabled";
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;
BOOL tryBytecode;
NSThread *javaScriptThread;
JSContext *context;
RCTJSCWrapper *jscWrapper;
};
@interface RCTJSContextProvider ()
/** May only be called once, or deadlock will result. */
- (RCTJSContextData)data;
@end
@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;
BOOL _tryBytecode;
NSThread *_javaScriptThread;
// Set at setUp time:
RCTPerformanceLogger *_performanceLogger;
RCTJSCWrapper *_jscWrapper;
RCTJavaScriptContext *_context;
// Set as needed:
RandomAccessBundleData _randomAccessBundle;
JSValueRef _batchedBridgeRef;
}
@synthesize valid = _valid;
@synthesize bridge = _bridge;
RCT_EXPORT_MODULE()
#if RCT_DEV
static void RCTInstallJSCProfiler(RCTBridge *bridge, JSContextRef context)
{
if (RCTJSCProfilerIsSupported()) {
[bridge.devMenu addItem:[RCTDevMenuItem toggleItemWithKey:RCTJSCProfilerEnabledDefaultsKey title:@"Start Profiling" selectedTitle:@"Stop Profiling" handler:^(BOOL shouldStart) {
if (shouldStart != RCTJSCProfilerIsProfiling(context)) {
if (shouldStart) {
RCTJSCProfilerStart(context);
} else {
NSString *outputFile = RCTJSCProfilerStop(context);
NSData *profileData = [NSData dataWithContentsOfFile:outputFile options:NSDataReadingMappedIfSafe error:NULL];
RCTProfileSendResult(bridge, @"cpu-profile", profileData);
}
}
}]];
}
}
#endif
+ (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;
if ([javaScriptThread respondsToSelector:@selector(setQualityOfService:)]) {
[javaScriptThread setQualityOfService:NSOperationQualityOfServiceUserInteractive];
} else {
javaScriptThread.threadPriority = [NSThread mainThread].threadPriority;
}
[javaScriptThread start];
return javaScriptThread;
}
- (void)setBridge:(RCTBridge *)bridge
{
_bridge = bridge;
_performanceLogger = [bridge performanceLogger];
}
- (instancetype)init
{
return [self initWithUseCustomJSCLibrary:NO];
}
- (instancetype)initWithUseCustomJSCLibrary:(BOOL)useCustomJSCLibrary
{
return [self initWithUseCustomJSCLibrary:useCustomJSCLibrary
tryBytecode:NO];
}
- (instancetype)initWithUseCustomJSCLibrary:(BOOL)useCustomJSCLibrary
tryBytecode:(BOOL)tryBytecode
{
RCT_PROFILE_BEGIN_EVENT(0, @"-[RCTJSCExecutor init]", nil);
if (self = [super init]) {
_useCustomJSCLibrary = useCustomJSCLibrary;
_tryBytecode = tryBytecode;
_valid = YES;
_javaScriptThread = newJavaScriptThread();
}
RCT_PROFILE_END_EVENT(RCTProfileTagAlways, @"");
return self;
}
+ (instancetype)initializedExecutorWithContextProvider:(RCTJSContextProvider *)JSContextProvider
JSContext:(JSContext **)JSContext
{
const RCTJSContextData data = JSContextProvider.data;
if (JSContext) {
*JSContext = data.context;
}
return [[RCTJSCExecutor alloc] initWithJSContextData:data];
}
- (instancetype)initWithJSContextData:(const RCTJSContextData &)data
{
if (self = [super init]) {
_useCustomJSCLibrary = data.useCustomJSCLibrary;
_tryBytecode = data.tryBytecode;
_valid = YES;
_javaScriptThread = data.javaScriptThread;
_jscWrapper = data.jscWrapper;
_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,
_jscWrapper,
_performanceLogger,
_context.context.JSGlobalContextRef);
}
- (RCTJavaScriptContext *)context
{
RCTAssertThread(_javaScriptThread, @"Must be called on JS thread.");
if (!self.isValid) {
return nil;
}
RCTAssert(_context != nil, @"Fetching context while valid, but before it is created");
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;
}
JSContext *context = nil;
if (self->_jscWrapper) {
RCTAssert(self->_context != nil, @"If wrapper was pre-initialized, context should be too");
context = self->_context.context;
} else {
[self->_performanceLogger markStartForTag:RCTPLJSCWrapperOpenLibrary];
self->_jscWrapper = RCTJSCWrapperCreate(self->_useCustomJSCLibrary);
[self->_performanceLogger markStopForTag:RCTPLJSCWrapperOpenLibrary];
RCTAssert(self->_context == nil, @"Didn't expect to set up twice");
self->_jscWrapper->configureJSCForIOS();
context = [self->_jscWrapper->JSContext new];
self->_context = [[RCTJavaScriptContext alloc] initWithJSContext:context onThread:self->_javaScriptThread];
[[NSNotificationCenter defaultCenter] postNotificationName:RCTJavaScriptContextCreatedNotification
object:context];
installBasicSynchronousHooksOnContext(context);
}
NSMutableDictionary *threadDictionary = [[NSThread currentThread] threadDictionary];
if (!threadDictionary[RCTFBJSContextClassKey] || !threadDictionary[RCTFBJSValueClassKey]) {
threadDictionary[RCTFBJSContextClassKey] = self->_jscWrapper->JSContext;
threadDictionary[RCTFBJSValueClassKey] = self->_jscWrapper->JSValue;
}
__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 (self->_jscWrapper->JSSamplingProfilerEnabled()) {
// Mark this thread as the main JS thread before starting profiling.
self->_jscWrapper->JSStartSamplingProfilingOnMainJSCThread(context.JSGlobalContextRef);
// Allow to toggle the sampling profiler through RN's dev menu
__weak JSContext *weakContext = self->_context.context;
[self->_bridge.devMenu addItem:[RCTDevMenuItem buttonItemWithTitle:@"Start / Stop JS Sampling Profiler" handler:^{
// JSPokeSamplingProfiler() toggles the profiling process
JSValueRef jsResult = self->_jscWrapper->JSPokeSamplingProfiler(weakContext.JSGlobalContextRef);
if (!self->_jscWrapper->JSValueIsNull(weakContext.JSGlobalContextRef, jsResult)) {
NSString *results = [[self->_jscWrapper->JSValue valueWithJSValueRef:jsResult inContext:weakContext] toObject];
JSCSamplingProfiler *profilerModule = [self->_bridge moduleForClass:[JSCSamplingProfiler class]];
[profilerModule operationCompletedWithResults:results];
}
}]];
// 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 *){
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf.isValid) {
return @{};
}
JSValueRef result = strongSelf->_jscWrapper->JSPokeSamplingProfiler(weakContext.JSGlobalContextRef);
return (NSDictionary *)[[strongSelf->_jscWrapper->JSValue valueWithJSValueRef:result inContext:weakContext] toObject];
};
}
#endif
#if RCT_DEV
RCTInstallJSCProfiler(self->_bridge, context.JSGlobalContextRef);
// Inject handler used by HMR
context[@"nativeInjectHMRUpdate"] = ^(NSString *sourceCode, NSString *sourceCodeURL) {
RCTJSCExecutor *strongSelf = weakSelf;
if (!strongSelf.valid) {
return;
}
RCTJSCWrapper *jscWrapper = strongSelf->_jscWrapper;
JSStringRef execJSString = jscWrapper->JSStringCreateWithUTF8CString(sourceCode.UTF8String);
JSStringRef jsURL = jscWrapper->JSStringCreateWithUTF8CString(sourceCodeURL.UTF8String);
jscWrapper->JSEvaluateScript(strongSelf->_context.context.JSGlobalContextRef, execJSString, NULL, jsURL, 0, NULL);
jscWrapper->JSStringRelease(jsURL);
jscWrapper->JSStringRelease(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 _tryBytecode
? _jscWrapper->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();
if (_jscWrapper) {
RCTJSCWrapperRelease(_jscWrapper);
_jscWrapper = NULL;
}
}
- (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}));
RCTJSCWrapper *jscWrapper = strongSelf->_jscWrapper;
JSContext *context = strongSelf->_context.context;
JSGlobalContextRef contextJSRef = context.JSGlobalContextRef;
// get the BatchedBridge object
JSValueRef errorJSRef = NULL;
JSValueRef batchedBridgeRef = strongSelf->_batchedBridgeRef;
if (!batchedBridgeRef) {
JSStringRef moduleNameJSStringRef = jscWrapper->JSStringCreateWithUTF8CString("__fbBatchedBridge");
JSObjectRef globalObjectJSRef = jscWrapper->JSContextGetGlobalObject(contextJSRef);
batchedBridgeRef = jscWrapper->JSObjectGetProperty(contextJSRef, globalObjectJSRef, moduleNameJSStringRef, &errorJSRef);
jscWrapper->JSStringRelease(moduleNameJSStringRef);
strongSelf->_batchedBridgeRef = batchedBridgeRef;
}
NSError *error;
JSValueRef resultJSRef = NULL;
if (batchedBridgeRef != NULL && errorJSRef == NULL && !jscWrapper->JSValueIsUndefined(contextJSRef, batchedBridgeRef)) {
// get method
JSStringRef methodNameJSStringRef = jscWrapper->JSStringCreateWithCFString((__bridge CFStringRef)method);
JSValueRef methodJSRef = jscWrapper->JSObjectGetProperty(contextJSRef, (JSObjectRef)batchedBridgeRef, methodNameJSStringRef, &errorJSRef);
jscWrapper->JSStringRelease(methodNameJSStringRef);
if (methodJSRef != NULL && errorJSRef == NULL && !jscWrapper->JSValueIsUndefined(contextJSRef, methodJSRef)) {
JSValueRef jsArgs[arguments.count];
for (NSUInteger i = 0; i < arguments.count; i++) {
jsArgs[i] = [jscWrapper->JSValue valueWithObject:arguments[i] inContext:context].JSValueRef;
}
resultJSRef = jscWrapper->JSObjectCallAsFunction(contextJSRef, (JSObjectRef)methodJSRef, (JSObjectRef)batchedBridgeRef, arguments.count, jsArgs, &errorJSRef);
} else {
if (!errorJSRef && jscWrapper->JSValueIsUndefined(contextJSRef, methodJSRef)) {
error = RCTErrorWithMessage([NSString stringWithFormat:@"Unable to execute JS call: method %@ is undefined", method]);
}
}
} else {
if (!errorJSRef && jscWrapper->JSValueIsUndefined(contextJSRef, batchedBridgeRef)) {
error = RCTErrorWithMessage(@"Unable to execute JS call: __fbBatchedBridge is undefined");
}
}
id objcValue;
if (errorJSRef || error) {
if (!error) {
error = RCTNSErrorFromJSError([jscWrapper->JSValue 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 (!jscWrapper->JSValueIsNull(contextJSRef, resultJSRef)) {
JSValue *result = [jscWrapper->JSValue 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->_jscWrapper,
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,
RCTJSCWrapper *jscWrapper,
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 = jscWrapper->JSStringCreateWithUTF8CString(sourceURL.absoluteString.UTF8String);
switch (taggedScript.tag) {
case facebook::react::ScriptTag::RAMBundle:
/* fallthrough */
case facebook::react::ScriptTag::String: {
JSStringRef execJSString = jscWrapper->JSStringCreateWithUTF8CString((const char *)taggedScript.script.bytes);
jscWrapper->JSEvaluateScript(ctx, execJSString, NULL, bundleURL, 0, &jsError);
jscWrapper->JSStringRelease(execJSString);
break;
}
case facebook::react::ScriptTag::BCBundle: {
file_ptr source(fopen(sourceURL.path.UTF8String, "r"), fclose);
int sourceFD = fileno(source.get());
jscWrapper->JSEvaluateBytecodeBundle(ctx, NULL, sourceFD, bundleURL, &jsError);
break;
}
}
jscWrapper->JSStringRelease(bundleURL);
[performanceLogger markStopForTag:RCTPLScriptExecution];
NSError *error = jsError
? RCTNSErrorFromJSErrorRef(jsError, ctx, jscWrapper)
: 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});
RCTJSCWrapper *jscWrapper = strongSelf->_jscWrapper;
JSStringRef execJSString = jscWrapper->JSStringCreateWithCFString((__bridge CFStringRef)script);
JSGlobalContextRef ctx = strongSelf->_context.context.JSGlobalContextRef;
JSValueRef valueToInject = jscWrapper->JSValueMakeFromJSONString(ctx, execJSString);
jscWrapper->JSStringRelease(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 = jscWrapper->JSContextGetGlobalObject(ctx);
JSStringRef JSName = jscWrapper->JSStringCreateWithCFString((__bridge CFStringRef)objectName);
JSValueRef jsError = NULL;
jscWrapper->JSObjectSetProperty(ctx, globalObject, JSName, valueToInject, kJSPropertyAttributeNone, &jsError);
jscWrapper->JSStringRelease(JSName);
if (jsError) {
error = RCTNSErrorFromJSErrorRef(jsError, ctx, jscWrapper);
}
}
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);
RCTJSCWrapper *jscWrapper = executor->_jscWrapper;
JSStringRef code = jscWrapper->JSStringCreateWithUTF8CString(data.get());
JSValueRef jsError = NULL;
JSStringRef sourceURL = jscWrapper->JSStringCreateWithUTF8CString(url);
JSGlobalContextRef ctx = executor->_context.context.JSGlobalContextRef;
JSValueRef result = jscWrapper->JSEvaluateScript(ctx, code, NULL, sourceURL, 0, &jsError);
jscWrapper->JSStringRelease(code);
jscWrapper->JSStringRelease(sourceURL);
if (!result) {
NSError *error = RCTNSErrorFromJSErrorRef(jsError, ctx, jscWrapper);
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;
RCTJSCWrapper *_jscWrapper;
}
- (instancetype)initWithUseCustomJSCLibrary:(BOOL)useCustomJSCLibrary
tryBytecode:(BOOL)tryBytecode
{
if (self = [super init]) {
_semaphore = dispatch_semaphore_create(0);
_useCustomJSCLibrary = useCustomJSCLibrary;
_tryBytecode = tryBytecode;
_javaScriptThread = newJavaScriptThread();
[self performSelector:@selector(_createContext) onThread:_javaScriptThread withObject:nil waitUntilDone:NO];
}
return self;
}
- (void)_createContext
{
_jscWrapper = RCTJSCWrapperCreate(_useCustomJSCLibrary);
_jscWrapper->configureJSCForIOS();
_context = [_jscWrapper->JSContext new];
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,
.tryBytecode = _tryBytecode,
.javaScriptThread = _javaScriptThread,
.context = _context,
.jscWrapper = _jscWrapper,
};
}
@end
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