react-native/React/Profiler/RCTProfile.m

704 lines
19 KiB
Objective-C

/**
* 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 "RCTProfile.h"
#import <dlfcn.h>
#import <libkern/OSAtomic.h>
#import <mach/mach.h>
#import <objc/message.h>
#import <objc/runtime.h>
#import <UIKit/UIKit.h>
#import "RCTAssert.h"
#import "RCTBridge.h"
#import "RCTBridge+Private.h"
#import "RCTComponentData.h"
#import "RCTDefines.h"
#import "RCTLog.h"
#import "RCTModuleData.h"
#import "RCTUtils.h"
#import "RCTUIManager.h"
NSString *const RCTProfileDidStartProfiling = @"RCTProfileDidStartProfiling";
NSString *const RCTProfileDidEndProfiling = @"RCTProfileDidEndProfiling";
#if RCT_DEV
#pragma mark - Constants
NSString *const RCTProfileTraceEvents = @"traceEvents";
NSString *const RCTProfileSamples = @"samples";
NSString *const RCTProfilePrefix = @"rct_profile_";
#pragma mark - Variables
// This is actually a BOOL - but has to be compatible with OSAtomic
static volatile uint32_t RCTProfileProfiling;
static NSDictionary *RCTProfileInfo;
static NSMutableDictionary *RCTProfileOngoingEvents;
static NSTimeInterval RCTProfileStartTime;
static NSUInteger RCTProfileEventID = 0;
static CADisplayLink *RCTProfileDisplayLink;
#pragma mark - Macros
#define RCTProfileAddEvent(type, props...) \
[RCTProfileInfo[type] addObject:@{ \
@"pid": @([[NSProcessInfo processInfo] processIdentifier]), \
props \
}];
#define CHECK(...) \
if (!RCTProfileIsProfiling()) { \
return __VA_ARGS__; \
}
#pragma mark - systrace glue code
static RCTProfileCallbacks *callbacks;
static char *systrace_buffer;
static systrace_arg_t *RCTProfileSystraceArgsFromNSDictionary(NSDictionary *args)
{
if (args.count == 0) {
return NULL;
}
systrace_arg_t *systrace_args = malloc(sizeof(systrace_arg_t) * args.count);
__block size_t i = 0;
[args enumerateKeysAndObjectsUsingBlock:^(id key, id value, __unused BOOL *stop) {
const char *keyc = [key description].UTF8String;
systrace_args[i].key = keyc;
systrace_args[i].key_len = (int)strlen(keyc);
const char *valuec = RCTJSONStringify(value, NULL).UTF8String;
systrace_args[i].value = valuec;
systrace_args[i].value_len = (int)strlen(valuec);
i++;
}];
return systrace_args;
}
void RCTProfileRegisterCallbacks(RCTProfileCallbacks *cb)
{
callbacks = cb;
}
#pragma mark - Private Helpers
static NSNumber *RCTProfileTimestamp(NSTimeInterval timestamp)
{
return @((timestamp - RCTProfileStartTime) * 1e6);
}
static NSString *RCTProfileMemory(vm_size_t memory)
{
double mem = ((double)memory) / 1024 / 1024;
return [NSString stringWithFormat:@"%.2lfmb", mem];
}
static NSDictionary *RCTProfileGetMemoryUsage(void)
{
struct task_basic_info info;
mach_msg_type_number_t size = sizeof(info);
kern_return_t kerr = task_info(mach_task_self(),
TASK_BASIC_INFO,
(task_info_t)&info,
&size);
if( kerr == KERN_SUCCESS ) {
return @{
@"suspend_count": @(info.suspend_count),
@"virtual_size": RCTProfileMemory(info.virtual_size),
@"resident_size": RCTProfileMemory(info.resident_size),
};
} else {
return @{};
}
}
static NSDictionary *RCTProfileMergeArgs(NSDictionary *args0, NSDictionary *args1)
{
args0 = RCTNilIfNull(args0);
args1 = RCTNilIfNull(args1);
if (!args0 && args1) {
args0 = args1;
} else if (args0 && args1) {
NSMutableDictionary *d = [args0 mutableCopy];
[d addEntriesFromDictionary:args1];
args0 = [d copy];
}
return RCTNullIfNil(args0);
}
#pragma mark - Module hooks
static const char *RCTProfileProxyClassName(Class class)
{
return [RCTProfilePrefix stringByAppendingString:NSStringFromClass(class)].UTF8String;
}
static dispatch_group_t RCTProfileGetUnhookGroup(void)
{
static dispatch_group_t unhookGroup;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
unhookGroup = dispatch_group_create();
});
return unhookGroup;
}
RCT_EXTERN IMP RCTProfileGetImplementation(id obj, SEL cmd);
IMP RCTProfileGetImplementation(id obj, SEL cmd)
{
return class_getMethodImplementation([obj class], cmd);
}
/**
* For the profiling we have to execute some code before and after every
* function being profiled, the only way of doing that with pure Objective-C is
* by using `-forwardInvocation:`, which is slow and could skew the profile
* results.
*
* The alternative in assembly is much simpler, we just need to store all the
* state at the beginning of the function, start the profiler, restore all the
* state, call the actual function we want to profile and stop the profiler.
*
* The implementation can be found in RCTProfileTrampoline-<arch>.s where arch
* is one of: i386, x86_64, arm, arm64.
*/
#if defined(__i386__) || \
defined(__x86_64__) || \
defined(__arm__) || \
defined(__arm64__)
RCT_EXTERN void RCTProfileTrampoline(void);
#else
static void *RCTProfileTrampoline = NULL;
#endif
RCT_EXTERN void RCTProfileTrampolineStart(id, SEL);
void RCTProfileTrampolineStart(id self, SEL cmd)
{
/**
* This call might be during dealloc, so we shouldn't retain the object in the
* block.
*/
Class klass = [self class];
RCT_PROFILE_BEGIN_EVENT(0, [NSString stringWithFormat:@"-[%s %s]", class_getName(klass), sel_getName(cmd)], nil);
}
RCT_EXTERN void RCTProfileTrampolineEnd(void);
void RCTProfileTrampolineEnd(void)
{
RCT_PROFILE_END_EVENT(0, @"objc_call,modules,auto", nil);
}
static void RCTProfileHookInstance(id instance)
{
Class moduleClass = object_getClass(instance);
/**
* We swizzle the instance -class method to return the original class, but
* object_getClass will return the actual class.
*
* If they are different, it means that the object is returning the original
* class, but it's actual class is the proxy subclass we created.
*/
if ([instance class] != moduleClass) {
return;
}
Class proxyClass = objc_allocateClassPair(moduleClass, RCTProfileProxyClassName(moduleClass), 0);
if (!proxyClass) {
proxyClass = objc_getClass(RCTProfileProxyClassName(moduleClass));
if (proxyClass) {
object_setClass(instance, proxyClass);
}
return;
}
unsigned int methodCount;
Method *methods = class_copyMethodList(moduleClass, &methodCount);
for (NSUInteger i = 0; i < methodCount; i++) {
Method method = methods[i];
SEL selector = method_getName(method);
/**
* Bail out on struct returns (except arm64) - we don't use it enough
* to justify writing a stret version
*/
#ifdef __arm64__
BOOL returnsStruct = NO;
#else
const char *typeEncoding = method_getTypeEncoding(method);
// bail out on structs and unions (since they might contain structs)
BOOL returnsStruct = typeEncoding[0] == '{' || typeEncoding[0] == '(';
#endif
/**
* Avoid hooking into NSObject methods, methods generated by React Native
* and special methods that start `.` (e.g. .cxx_destruct)
*/
if ([NSStringFromSelector(selector) hasPrefix:@"rct"] || [NSObject instancesRespondToSelector:selector] || sel_getName(selector)[0] == '.' || returnsStruct) {
continue;
}
const char *types = method_getTypeEncoding(method);
class_addMethod(proxyClass, selector, (IMP)RCTProfileTrampoline, types);
}
free(methods);
class_replaceMethod(object_getClass(proxyClass), @selector(initialize), imp_implementationWithBlock(^{}), "v@:");
for (Class cls in @[proxyClass, object_getClass(proxyClass)]) {
Method oldImp = class_getInstanceMethod(cls, @selector(class));
class_replaceMethod(cls, @selector(class), imp_implementationWithBlock(^{ return moduleClass; }), method_getTypeEncoding(oldImp));
}
objc_registerClassPair(proxyClass);
object_setClass(instance, proxyClass);
}
static UIView *(*originalCreateView)(RCTComponentData *, SEL, NSNumber *);
RCT_EXTERN UIView *RCTProfileCreateView(RCTComponentData *self, SEL _cmd, NSNumber *tag);
UIView *RCTProfileCreateView(RCTComponentData *self, SEL _cmd, NSNumber *tag)
{
UIView *view = originalCreateView(self, _cmd, tag);
RCTProfileHookInstance(view);
return view;
}
void RCTProfileHookModules(RCTBridge *bridge)
{
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wtautological-pointer-compare"
if (RCTProfileTrampoline == NULL) {
return;
}
#pragma clang diagnostic pop
for (RCTModuleData *moduleData in [bridge valueForKey:@"moduleDataByID"]) {
[bridge dispatchBlock:^{
RCTProfileHookInstance(moduleData.instance);
} queue:moduleData.methodQueue];
}
dispatch_async(dispatch_get_main_queue(), ^{
for (id view in [bridge.uiManager valueForKey:@"viewRegistry"]) {
RCTProfileHookInstance([bridge.uiManager viewForReactTag:view]);
}
Method createView = class_getInstanceMethod([RCTComponentData class], @selector(createViewWithTag:));
if (method_getImplementation(createView) != (IMP)RCTProfileCreateView) {
originalCreateView = (typeof(originalCreateView))method_getImplementation(createView);
method_setImplementation(createView, (IMP)RCTProfileCreateView);
}
});
}
static void RCTProfileUnhookInstance(id instance)
{
if ([instance class] != object_getClass(instance)) {
object_setClass(instance, [instance class]);
}
}
void RCTProfileUnhookModules(RCTBridge *bridge)
{
dispatch_group_enter(RCTProfileGetUnhookGroup());
for (RCTModuleData *moduleData in [bridge valueForKey:@"moduleDataByID"]) {
RCTProfileUnhookInstance(moduleData.instance);
}
dispatch_async(dispatch_get_main_queue(), ^{
for (id view in [bridge.uiManager valueForKey:@"viewRegistry"]) {
RCTProfileUnhookInstance(view);
}
dispatch_group_leave(RCTProfileGetUnhookGroup());
});
}
#pragma mark - Private ObjC class only used for the vSYNC CADisplayLink target
@interface RCTProfile : NSObject
@end
@implementation RCTProfile
+ (void)vsync:(CADisplayLink *)displayLink
{
RCTProfileImmediateEvent(0, @"VSYNC", displayLink.timestamp, 'g');
}
@end
#pragma mark - Public Functions
dispatch_queue_t RCTProfileGetQueue(void)
{
static dispatch_queue_t queue;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
queue = dispatch_queue_create("com.facebook.react.Profiler", DISPATCH_QUEUE_SERIAL);
});
return queue;
}
BOOL RCTProfileIsProfiling(void)
{
return (BOOL)RCTProfileProfiling;
}
void RCTProfileInit(RCTBridge *bridge)
{
// TODO: enable assert JS thread from any file (and assert here)
if (RCTProfileIsProfiling()) {
return;
}
OSAtomicOr32Barrier(1, &RCTProfileProfiling);
if (callbacks != NULL) {
size_t buffer_size = 1 << 22;
systrace_buffer = calloc(1, buffer_size);
callbacks->start(~((uint64_t)0), systrace_buffer, buffer_size);
} else {
NSTimeInterval time = CACurrentMediaTime();
dispatch_async(RCTProfileGetQueue(), ^{
RCTProfileStartTime = time;
RCTProfileOngoingEvents = [NSMutableDictionary new];
RCTProfileInfo = @{
RCTProfileTraceEvents: [NSMutableArray new],
RCTProfileSamples: [NSMutableArray new],
};
});
}
RCTProfileHookModules(bridge);
RCTProfileDisplayLink = [CADisplayLink displayLinkWithTarget:[RCTProfile class]
selector:@selector(vsync:)];
[RCTProfileDisplayLink addToRunLoop:[NSRunLoop mainRunLoop]
forMode:NSRunLoopCommonModes];
[[NSNotificationCenter defaultCenter] postNotificationName:RCTProfileDidStartProfiling
object:bridge];
}
void RCTProfileEnd(RCTBridge *bridge, void (^callback)(NSString *))
{
// assert JavaScript thread here again
if (!RCTProfileIsProfiling()) {
return;
}
OSAtomicAnd32Barrier(0, &RCTProfileProfiling);
[[NSNotificationCenter defaultCenter] postNotificationName:RCTProfileDidEndProfiling
object:bridge];
[RCTProfileDisplayLink invalidate];
RCTProfileDisplayLink = nil;
RCTProfileUnhookModules(bridge);
if (callbacks != NULL) {
callbacks->stop();
callback(@(systrace_buffer));
} else {
dispatch_async(RCTProfileGetQueue(), ^{
NSString *log = RCTJSONStringify(RCTProfileInfo, NULL);
RCTProfileEventID = 0;
RCTProfileInfo = nil;
RCTProfileOngoingEvents = nil;
callback(log);
});
}
}
static NSMutableArray<NSArray *> *RCTProfileGetThreadEvents(NSThread *thread)
{
static NSString *const RCTProfileThreadEventsKey = @"RCTProfileThreadEventsKey";
NSMutableArray<NSArray *> *threadEvents =
thread.threadDictionary[RCTProfileThreadEventsKey];
if (!threadEvents) {
threadEvents = [NSMutableArray new];
thread.threadDictionary[RCTProfileThreadEventsKey] = threadEvents;
}
return threadEvents;
}
void _RCTProfileBeginEvent(
NSThread *calleeThread,
NSTimeInterval time,
uint64_t tag,
NSString *name,
NSDictionary *args
) {
CHECK();
RCTAssertThread(RCTProfileGetQueue(), @"Must be called RCTProfile queue");;
if (callbacks != NULL) {
callbacks->begin_section(tag, name.UTF8String, args.count, RCTProfileSystraceArgsFromNSDictionary(args));
return;
}
NSMutableArray *events = RCTProfileGetThreadEvents(calleeThread);
[events addObject:@[
RCTProfileTimestamp(time),
@(tag),
name,
RCTNullIfNil(args),
]];
}
void _RCTProfileEndEvent(
NSThread *calleeThread,
NSString *threadName,
NSTimeInterval time,
uint64_t tag,
NSString *category,
NSDictionary *args
) {
CHECK();
RCTAssertThread(RCTProfileGetQueue(), @"Must be called RCTProfile queue");;
if (callbacks != NULL) {
callbacks->end_section(tag, args.count, RCTProfileSystraceArgsFromNSDictionary(args));
return;
}
NSMutableArray<NSArray *> *events = RCTProfileGetThreadEvents(calleeThread);
NSArray *event = events.lastObject;
[events removeLastObject];
if (!event) {
return;
}
NSNumber *start = event[0];
RCTProfileAddEvent(RCTProfileTraceEvents,
@"tid": threadName,
@"name": event[2],
@"cat": category,
@"ph": @"X",
@"ts": start,
@"dur": @(RCTProfileTimestamp(time).doubleValue - start.doubleValue),
@"args": RCTProfileMergeArgs(event[3], args),
);
}
NSUInteger RCTProfileBeginAsyncEvent(
uint64_t tag,
NSString *name,
NSDictionary *args
) {
CHECK(0);
static NSUInteger eventID = 0;
NSTimeInterval time = CACurrentMediaTime();
NSUInteger currentEventID = ++eventID;
if (callbacks != NULL) {
callbacks->begin_async_section(tag, name.UTF8String, (int)(currentEventID % INT_MAX), args.count, RCTProfileSystraceArgsFromNSDictionary(args));
} else {
dispatch_async(RCTProfileGetQueue(), ^{
RCTProfileOngoingEvents[@(currentEventID)] = @[
RCTProfileTimestamp(time),
name,
RCTNullIfNil(args),
];
});
}
return currentEventID;
}
void RCTProfileEndAsyncEvent(
uint64_t tag,
NSString *category,
NSUInteger cookie,
NSString *name,
NSDictionary *args
) {
CHECK();
if (callbacks != NULL) {
callbacks->end_async_section(tag, name.UTF8String, (int)(cookie % INT_MAX), args.count, RCTProfileSystraceArgsFromNSDictionary(args));
return;
}
NSTimeInterval time = CACurrentMediaTime();
NSString *threadName = RCTCurrentThreadName();
dispatch_async(RCTProfileGetQueue(), ^{
NSArray *event = RCTProfileOngoingEvents[@(cookie)];
if (event) {
NSNumber *endTimestamp = RCTProfileTimestamp(time);
RCTProfileAddEvent(RCTProfileTraceEvents,
@"tid": threadName,
@"name": event[1],
@"cat": category,
@"ph": @"X",
@"ts": event[0],
@"dur": @(endTimestamp.doubleValue - [event[0] doubleValue]),
@"args": RCTProfileMergeArgs(event[2], args),
);
[RCTProfileOngoingEvents removeObjectForKey:@(cookie)];
}
});
}
void RCTProfileImmediateEvent(
uint64_t tag,
NSString *name,
NSTimeInterval time,
char scope
) {
CHECK();
if (callbacks != NULL) {
callbacks->instant_section(tag, name.UTF8String, scope);
return;
}
NSString *threadName = RCTCurrentThreadName();
dispatch_async(RCTProfileGetQueue(), ^{
RCTProfileAddEvent(RCTProfileTraceEvents,
@"tid": threadName,
@"name": name,
@"ts": RCTProfileTimestamp(time),
@"scope": @(scope),
@"ph": @"i",
@"args": RCTProfileGetMemoryUsage(),
);
});
}
NSNumber *_RCTProfileBeginFlowEvent(void)
{
static NSUInteger flowID = 0;
CHECK(@0);
if (callbacks != NULL) {
// flow events not supported yet
return @0;
}
NSTimeInterval time = CACurrentMediaTime();
NSNumber *currentID = @(++flowID);
NSString *threadName = RCTCurrentThreadName();
dispatch_async(RCTProfileGetQueue(), ^{
RCTProfileAddEvent(RCTProfileTraceEvents,
@"tid": threadName,
@"name": @"flow",
@"id": currentID,
@"cat": @"flow",
@"ph": @"s",
@"ts": RCTProfileTimestamp(time),
);
});
return currentID;
}
void _RCTProfileEndFlowEvent(NSNumber *flowID)
{
CHECK();
if (callbacks != NULL) {
return;
}
NSTimeInterval time = CACurrentMediaTime();
NSString *threadName = RCTCurrentThreadName();
dispatch_async(RCTProfileGetQueue(), ^{
RCTProfileAddEvent(RCTProfileTraceEvents,
@"tid": threadName,
@"name": @"flow",
@"id": flowID,
@"cat": @"flow",
@"ph": @"f",
@"ts": RCTProfileTimestamp(time),
);
});
}
void RCTProfileSendResult(RCTBridge *bridge, NSString *route, NSData *data)
{
if (![bridge.bundleURL.scheme hasPrefix:@"http"]) {
RCTLogWarn(@"Cannot upload profile information because you're not connected to the packager. The profiling data is still saved in the app container.");
return;
}
NSURL *URL = [NSURL URLWithString:[@"/" stringByAppendingString:route] relativeToURL:bridge.bundleURL];
NSMutableURLRequest *URLRequest = [NSMutableURLRequest requestWithURL:URL];
URLRequest.HTTPMethod = @"POST";
[URLRequest setValue:@"application/json"
forHTTPHeaderField:@"Content-Type"];
NSURLSessionTask *task =
[[NSURLSession sharedSession] uploadTaskWithRequest:URLRequest
fromData:data
completionHandler:
^(NSData *responseData, __unused NSURLResponse *response, NSError *error) {
if (error) {
RCTLogError(@"%@", error.localizedDescription);
} else {
NSString *message = [[NSString alloc] initWithData:responseData
encoding:NSUTF8StringEncoding];
if (message.length) {
dispatch_async(dispatch_get_main_queue(), ^{
[[[UIAlertView alloc] initWithTitle:@"Profile"
message:message
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil] show];
});
}
}
}];
[task resume];
}
#endif