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react-native/React/Executors/RCTContextExecutor.m

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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 "RCTContextExecutor.h"
#import <pthread.h>
#import <JavaScriptCore/JavaScriptCore.h>
#import <UIKit/UIDevice.h>
#import "RCTAssert.h"
#import "RCTDefines.h"
#import "RCTDevMenu.h"
#import "RCTLog.h"
#import "RCTProfile.h"
#import "RCTPerformanceLogger.h"
#import "RCTUtils.h"
#ifndef RCT_JSC_PROFILER
#if RCT_DEV
#define RCT_JSC_PROFILER 1
#else
#define RCT_JSC_PROFILER 0
#endif
#endif
#if RCT_JSC_PROFILER
#include <dlfcn.h>
static NSString * const RCTJSCProfilerEnabledDefaultsKey = @"RCTJSCProfilerEnabled";
#ifndef RCT_JSC_PROFILER_DYLIB
#define RCT_JSC_PROFILER_DYLIB [[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"RCTJSCProfiler.ios%zd", [[[UIDevice currentDevice] systemVersion] integerValue]] ofType:@"dylib" inDirectory:@"RCTJSCProfiler"] UTF8String]
#endif
#endif
@interface RCTJavaScriptContext : NSObject <RCTInvalidating>
@property (nonatomic, assign, readonly) JSGlobalContextRef ctx;
- (instancetype)initWithJSContext:(JSGlobalContextRef)context NS_DESIGNATED_INITIALIZER;
@end
@implementation RCTJavaScriptContext
{
RCTJavaScriptContext *_self;
}
- (instancetype)initWithJSContext:(JSGlobalContextRef)context
{
if ((self = [super init])) {
_ctx = context;
_self = self;
}
return self;
}
RCT_NOT_IMPLEMENTED(-(instancetype)init)
- (BOOL)isValid
{
return _ctx != NULL;
}
- (void)invalidate
{
if (self.isValid) {
JSGlobalContextRelease(_ctx);
_ctx = NULL;
_self = nil;
}
}
- (void)dealloc
{
CFRunLoopStop([[NSRunLoop currentRunLoop] getCFRunLoop]);
}
@end
@implementation RCTContextExecutor
{
RCTJavaScriptContext *_context;
NSThread *_javaScriptThread;
}
@synthesize valid = _valid;
@synthesize bridge = _bridge;
RCT_EXPORT_MODULE()
/**
* The one tiny pure native hook that we implement is a native logging hook.
* You could even argue that this is not necessary - we could plumb logging
* calls through a batched bridge, but having the pure native hook allows
* logging to successfully come through even in the event that a batched bridge
* crashes.
*/
static JSValueRef RCTNativeLoggingHook(JSContextRef context, __unused JSObjectRef object, __unused JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef *exception)
{
if (argumentCount > 0) {
JSStringRef messageRef = JSValueToStringCopy(context, arguments[0], exception);
if (!messageRef) {
return JSValueMakeUndefined(context);
}
NSString *message = (__bridge_transfer NSString *)JSStringCopyCFString(kCFAllocatorDefault, messageRef);
JSStringRelease(messageRef);
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:
@"( stack: )?([_a-z0-9]*)@?(http://|file:///)[a-z.0-9:/_-]+/([a-z0-9_]+).bundle(:[0-9]+:[0-9]+)"
options:NSRegularExpressionCaseInsensitive
error:NULL];
message = [regex stringByReplacingMatchesInString:message
options:0
range:(NSRange){0, message.length}
withTemplate:@"[$4$5] \t$2"];
RCTLogLevel level = RCTLogLevelInfo;
if (argumentCount > 1) {
level = MAX(level, JSValueToNumber(context, arguments[1], exception) - 1);
}
RCTGetLogFunction()(level, nil, nil, message);
}
return JSValueMakeUndefined(context);
}
// Do-very-little native hook for testing.
static JSValueRef RCTNoop(JSContextRef context, __unused JSObjectRef object, __unused JSObjectRef thisObject, __unused size_t argumentCount, __unused const JSValueRef arguments[], __unused JSValueRef *exception)
{
static int counter = 0;
counter++;
return JSValueMakeUndefined(context);
}
static NSString *RCTJSValueToNSString(JSContextRef context, JSValueRef value)
{
JSStringRef JSString = JSValueToStringCopy(context, value, NULL);
CFStringRef string = JSStringCopyCFString(kCFAllocatorDefault, JSString);
JSStringRelease(JSString);
return (__bridge_transfer NSString *)string;
}
static NSString *RCTJSValueToJSONString(JSContextRef context, JSValueRef value, unsigned indent)
{
JSStringRef JSString = JSValueCreateJSONString(context, value, indent, NULL);
CFStringRef string = JSStringCopyCFString(kCFAllocatorDefault, JSString);
JSStringRelease(JSString);
return (__bridge_transfer NSString *)string;
}
static NSError *RCTNSErrorFromJSError(JSContextRef context, JSValueRef jsError)
{
NSString *errorMessage = jsError ? RCTJSValueToNSString(context, jsError) : @"unknown JS error";
NSString *details = jsError ? RCTJSValueToJSONString(context, jsError, 2) : @"no details";
return [NSError errorWithDomain:@"JS" code:1 userInfo:@{NSLocalizedDescriptionKey: errorMessage, NSLocalizedFailureReasonErrorKey: details}];
}
#if RCT_DEV
static JSValueRef RCTNativeTraceBeginSection(JSContextRef context, __unused JSObjectRef object, __unused JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], __unused JSValueRef *exception)
{
static int profileCounter = 1;
NSString *profileName;
double tag = 0;
if (argumentCount > 0) {
if (JSValueIsNumber(context, arguments[0])) {
tag = JSValueToNumber(context, arguments[0], NULL);
} else {
profileName = RCTJSValueToNSString(context, arguments[0]);
}
} else {
profileName = [NSString stringWithFormat:@"Profile %d", profileCounter++];
}
if (argumentCount > 1 && JSValueIsString(context, arguments[1])) {
profileName = RCTJSValueToNSString(context, arguments[1]);
}
if (profileName) {
RCTProfileBeginEvent(tag, profileName, nil);
}
return JSValueMakeUndefined(context);
}
static JSValueRef RCTNativeTraceEndSection(JSContextRef context, __unused JSObjectRef object, __unused JSObjectRef thisObject, __unused size_t argumentCount, __unused const JSValueRef arguments[], __unused JSValueRef *exception)
{
if (argumentCount > 0) {
JSValueRef *error = NULL;
double tag = JSValueToNumber(context, arguments[0], error);
if (error == NULL) {
RCTProfileEndEvent((uint64_t)tag, @"console", nil);
}
}
return JSValueMakeUndefined(context);
}
static void RCTInstallJSCProfiler(RCTBridge *bridge, JSContextRef context)
{
#if RCT_JSC_PROFILER
void *JSCProfiler = dlopen(RCT_JSC_PROFILER_DYLIB, RTLD_NOW);
if (JSCProfiler != NULL) {
void (*nativeProfilerStart)(JSContextRef, const char *) =
(__typeof__(nativeProfilerStart))dlsym(JSCProfiler, "nativeProfilerStart");
void (*nativeProfilerEnd)(JSContextRef, const char *, const char *) =
(__typeof__(nativeProfilerEnd))dlsym(JSCProfiler, "nativeProfilerEnd");
if (nativeProfilerStart != NULL && nativeProfilerEnd != NULL) {
void (*nativeProfilerEnableByteCode)(void) =
(__typeof__(nativeProfilerEnableByteCode))dlsym(JSCProfiler, "nativeProfilerEnableByteCode");
if (nativeProfilerEnableByteCode != NULL) {
nativeProfilerEnableByteCode();
}
static BOOL isProfiling = NO;
[bridge.devMenu addItem:[RCTDevMenuItem toggleItemWithKey:RCTJSCProfilerEnabledDefaultsKey title:@"Start Profiling" selectedTitle:@"Stop Profiling" handler:^(BOOL shouldStart) {
if (shouldStart == isProfiling) {
return;
}
isProfiling = shouldStart;
if (shouldStart) {
nativeProfilerStart(context, "profile");
} else {
NSString *outputFile = [NSTemporaryDirectory() stringByAppendingPathComponent:@"cpu_profile.json"];
nativeProfilerEnd(context, "profile", outputFile.UTF8String);
NSData *profileData = [NSData dataWithContentsOfFile:outputFile
options:NSDataReadingMappedIfSafe
error:NULL];
RCTProfileSendResult(bridge, @"cpu-profile", profileData);
}
}]];
}
}
#endif
}
#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.
}
}
}
- (instancetype)init
{
NSThread *javaScriptThread = [[NSThread alloc] initWithTarget:[self class]
selector:@selector(runRunLoopThread)
object:nil];
javaScriptThread.name = @"com.facebook.React.JavaScript";
javaScriptThread.threadPriority = [NSThread mainThread].threadPriority;
[javaScriptThread start];
return [self initWithJavaScriptThread:javaScriptThread globalContextRef:NULL];
}
- (instancetype)initWithJavaScriptThread:(NSThread *)javaScriptThread
globalContextRef:(JSGlobalContextRef)context
{
RCTAssert(javaScriptThread != nil,
@"Can't initialize RCTContextExecutor without a javaScriptThread");
if ((self = [super init])) {
_valid = YES;
_javaScriptThread = javaScriptThread;
__weak RCTContextExecutor *weakSelf = self;
[self executeBlockOnJavaScriptQueue: ^{
RCTContextExecutor *strongSelf = weakSelf;
if (!strongSelf) {
return;
}
// Assumes that no other JS tasks are scheduled before.
JSGlobalContextRef ctx;
if (context) {
ctx = JSGlobalContextRetain(context);
strongSelf->_context = [[RCTJavaScriptContext alloc] initWithJSContext:ctx];
}
}];
}
return self;
}
- (void)setUp
{
__weak RCTContextExecutor *weakSelf = self;
[self executeBlockOnJavaScriptQueue:^{
RCTContextExecutor *strongSelf = weakSelf;
if (!strongSelf.isValid) {
return;
}
if (!strongSelf->_context) {
JSGlobalContextRef ctx = JSGlobalContextCreate(NULL);
strongSelf->_context = [[RCTJavaScriptContext alloc] initWithJSContext:ctx];
}
[strongSelf _addNativeHook:RCTNativeLoggingHook withName:"nativeLoggingHook"];
[strongSelf _addNativeHook:RCTNoop withName:"noop"];
#if RCT_DEV
[strongSelf _addNativeHook:RCTNativeTraceBeginSection withName:"nativeTraceBeginSection"];
[strongSelf _addNativeHook:RCTNativeTraceEndSection withName:"nativeTraceEndSection"];
RCTInstallJSCProfiler(_bridge, strongSelf->_context.ctx);
for (NSString *event in @[RCTProfileDidStartProfiling, RCTProfileDidEndProfiling]) {
[[NSNotificationCenter defaultCenter] addObserver:strongSelf
selector:@selector(toggleProfilingFlag:)
name:event
object:nil];
}
#endif
}];
}
- (void)toggleProfilingFlag:(NSNotification *)notification
{
[self executeBlockOnJavaScriptQueue:^{
BOOL enabled = [notification.name isEqualToString:RCTProfileDidStartProfiling];
NSString *script = [NSString stringWithFormat:@"var p = require('BridgeProfiling') || {}; p.setEnabled && p.setEnabled(%@)", enabled ? @"true" : @"false"];
JSStringRef scriptJSRef = JSStringCreateWithUTF8CString(script.UTF8String);
JSEvaluateScript(_context.ctx, scriptJSRef, NULL, NULL, 0, NULL);
JSStringRelease(scriptJSRef);
}];
}
- (void)_addNativeHook:(JSObjectCallAsFunctionCallback)hook withName:(const char *)name
{
JSObjectRef globalObject = JSContextGetGlobalObject(_context.ctx);
JSStringRef JSName = JSStringCreateWithUTF8CString(name);
JSObjectSetProperty(_context.ctx, globalObject, JSName, JSObjectMakeFunctionWithCallback(_context.ctx, JSName, hook), kJSPropertyAttributeNone, NULL);
JSStringRelease(JSName);
}
- (void)invalidate
{
if (!self.isValid) {
return;
}
_valid = NO;
#if RCT_DEV
[[NSNotificationCenter defaultCenter] removeObserver:self];
#endif
[_context performSelector:@selector(invalidate)
onThread:_javaScriptThread
withObject:nil
waitUntilDone:NO];
_context = nil;
}
- (void)dealloc
{
[self invalidate];
}
- (void)executeJSCall:(NSString *)name
method:(NSString *)method
arguments:(NSArray *)arguments
callback:(RCTJavaScriptCallback)onComplete
{
RCTAssert(onComplete != nil, @"onComplete block should not be nil");
__weak RCTContextExecutor *weakSelf = self;
[self executeBlockOnJavaScriptQueue:RCTProfileBlock((^{
RCTContextExecutor *strongSelf = weakSelf;
if (!strongSelf || !strongSelf.isValid) {
return;
}
NSError *error;
NSString *argsString = (arguments.count == 1) ? RCTJSONStringify(arguments[0], &error) : RCTJSONStringify(arguments, &error);
if (!argsString) {
RCTLogError(@"Cannot convert argument to string: %@", error);
onComplete(nil, error);
return;
}
JSValueRef errorJSRef = NULL;
JSValueRef resultJSRef = NULL;
JSGlobalContextRef contextJSRef = JSContextGetGlobalContext(strongSelf->_context.ctx);
JSObjectRef globalObjectJSRef = JSContextGetGlobalObject(strongSelf->_context.ctx);
// get require
JSStringRef requireNameJSStringRef = JSStringCreateWithUTF8CString("require");
JSValueRef requireJSRef = JSObjectGetProperty(contextJSRef, globalObjectJSRef, requireNameJSStringRef, &errorJSRef);
JSStringRelease(requireNameJSStringRef);
if (requireJSRef != NULL && !JSValueIsUndefined(contextJSRef, requireJSRef) && errorJSRef == NULL) {
// get module
JSStringRef moduleNameJSStringRef = JSStringCreateWithCFString((__bridge CFStringRef)name);
JSValueRef moduleNameJSRef = JSValueMakeString(contextJSRef, moduleNameJSStringRef);
JSValueRef moduleJSRef = JSObjectCallAsFunction(contextJSRef, (JSObjectRef)requireJSRef, NULL, 1, (const JSValueRef *)&moduleNameJSRef, &errorJSRef);
JSStringRelease(moduleNameJSStringRef);
if (moduleJSRef != NULL && errorJSRef == NULL && !JSValueIsUndefined(contextJSRef, moduleJSRef)) {
// get method
JSStringRef methodNameJSStringRef = JSStringCreateWithCFString((__bridge CFStringRef)method);
JSValueRef methodJSRef = JSObjectGetProperty(contextJSRef, (JSObjectRef)moduleJSRef, methodNameJSStringRef, &errorJSRef);
JSStringRelease(methodNameJSStringRef);
if (methodJSRef != NULL && errorJSRef == NULL) {
// direct method invoke with no arguments
if (arguments.count == 0) {
resultJSRef = JSObjectCallAsFunction(contextJSRef, (JSObjectRef)methodJSRef, (JSObjectRef)moduleJSRef, 0, NULL, &errorJSRef);
}
// direct method invoke with 1 argument
else if(arguments.count == 1) {
JSStringRef argsJSStringRef = JSStringCreateWithCFString((__bridge CFStringRef)argsString);
JSValueRef argsJSRef = JSValueMakeFromJSONString(contextJSRef, argsJSStringRef);
resultJSRef = JSObjectCallAsFunction(contextJSRef, (JSObjectRef)methodJSRef, (JSObjectRef)moduleJSRef, 1, &argsJSRef, &errorJSRef);
JSStringRelease(argsJSStringRef);
} else {
// apply invoke with array of arguments
JSStringRef applyNameJSStringRef = JSStringCreateWithUTF8CString("apply");
JSValueRef applyJSRef = JSObjectGetProperty(contextJSRef, (JSObjectRef)methodJSRef, applyNameJSStringRef, &errorJSRef);
JSStringRelease(applyNameJSStringRef);
if (applyJSRef != NULL && errorJSRef == NULL) {
// invoke apply
JSStringRef argsJSStringRef = JSStringCreateWithCFString((__bridge CFStringRef)argsString);
JSValueRef argsJSRef = JSValueMakeFromJSONString(contextJSRef, argsJSStringRef);
JSValueRef args[2];
args[0] = JSValueMakeNull(contextJSRef);
args[1] = argsJSRef;
resultJSRef = JSObjectCallAsFunction(contextJSRef, (JSObjectRef)applyJSRef, (JSObjectRef)methodJSRef, 2, args, &errorJSRef);
JSStringRelease(argsJSStringRef);
}
}
}
}
}
if (!resultJSRef) {
onComplete(nil, RCTNSErrorFromJSError(contextJSRef, errorJSRef));
return;
}
// Looks like making lots of JSC API calls is slower than communicating by using a JSON
// string. Also it ensures that data stuctures don't have cycles and non-serializable fields.
// see [RCTContextExecutorTests testDeserializationPerf]
id objcValue;
// We often return `null` from JS when there is nothing for native side. JSONKit takes an extra hundred microseconds
// to handle this simple case, so we are adding a shortcut to make executeJSCall method even faster
if (!JSValueIsNull(contextJSRef, resultJSRef)) {
JSStringRef jsJSONString = JSValueCreateJSONString(contextJSRef, resultJSRef, 0, nil);
if (jsJSONString) {
NSString *objcJSONString = (__bridge_transfer NSString *)JSStringCopyCFString(kCFAllocatorDefault, jsJSONString);
JSStringRelease(jsJSONString);
objcValue = RCTJSONParse(objcJSONString, NULL);
}
}
onComplete(objcValue, nil);
}), 0, @"js_call", (@{@"module":name, @"method": method, @"args": arguments}))];
}
- (void)executeApplicationScript:(NSString *)script
sourceURL:(NSURL *)sourceURL
onComplete:(RCTJavaScriptCompleteBlock)onComplete
{
RCTAssertParam(script);
RCTAssertParam(sourceURL);
__weak RCTContextExecutor *weakSelf = self;
[self executeBlockOnJavaScriptQueue:RCTProfileBlock((^{
RCTContextExecutor *strongSelf = weakSelf;
if (!strongSelf || !strongSelf.isValid) {
return;
}
RCTPerformanceLoggerStart(RCTPLScriptExecution);
JSValueRef jsError = NULL;
JSStringRef execJSString = JSStringCreateWithCFString((__bridge CFStringRef)script);
JSStringRef jsURL = JSStringCreateWithCFString((__bridge CFStringRef)sourceURL.absoluteString);
JSValueRef result = JSEvaluateScript(strongSelf->_context.ctx, execJSString, NULL, jsURL, 0, &jsError);
JSStringRelease(jsURL);
JSStringRelease(execJSString);
RCTPerformanceLoggerEnd(RCTPLScriptExecution);
if (onComplete) {
NSError *error;
if (!result) {
error = RCTNSErrorFromJSError(strongSelf->_context.ctx, jsError);
}
onComplete(error);
}
}), 0, @"js_call", (@{ @"url": sourceURL.absoluteString }))];
}
- (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)_runBlock:(dispatch_block_t)block
{
block();
}
- (void)injectJSONText:(NSString *)script
asGlobalObjectNamed:(NSString *)objectName
callback:(RCTJavaScriptCompleteBlock)onComplete
{
if (RCT_DEBUG) {
RCTAssert(RCTJSONParse(script, NULL) != nil, @"%@ wasn't valid JSON!", script);
}
__weak RCTContextExecutor *weakSelf = self;
[self executeBlockOnJavaScriptQueue:RCTProfileBlock((^{
RCTContextExecutor *strongSelf = weakSelf;
if (!strongSelf || !strongSelf.isValid) {
return;
}
JSStringRef execJSString = JSStringCreateWithCFString((__bridge CFStringRef)script);
JSValueRef valueToInject = JSValueMakeFromJSONString(strongSelf->_context.ctx, execJSString);
JSStringRelease(execJSString);
if (!valueToInject) {
NSString *errorDesc = [NSString stringWithFormat:@"Can't make JSON value from script '%@'", script];
RCTLogError(@"%@", errorDesc);
if (onComplete) {
NSError *error = [NSError errorWithDomain:@"JS" code:2 userInfo:@{NSLocalizedDescriptionKey: errorDesc}];
onComplete(error);
}
return;
}
JSObjectRef globalObject = JSContextGetGlobalObject(strongSelf->_context.ctx);
JSStringRef JSName = JSStringCreateWithCFString((__bridge CFStringRef)objectName);
JSObjectSetProperty(strongSelf->_context.ctx, globalObject, JSName, valueToInject, kJSPropertyAttributeNone, NULL);
JSStringRelease(JSName);
if (onComplete) {
onComplete(nil);
}
}), 0, @"js_call,json_call", (@{@"objectName": objectName}))];
}
RCT_EXPORT_METHOD(setContextName:(nonnull NSString *)name)
{
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wtautological-pointer-compare"
if (JSGlobalContextSetName != NULL) {
#pragma clang diagnostic pop
JSStringRef JSName = JSStringCreateWithCFString((__bridge CFStringRef)name);
JSGlobalContextSetName(_context.ctx, JSName);
JSStringRelease(JSName);
}
}
@end
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