react-native/React/Profiler/RCTJSCProfiler.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 "RCTJSCProfiler.h"
#import "RCTLog.h"
#import <UIKit/UIKit.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>
#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
static const char *const JSCProfileName = "profile";
typedef void (*JSCProfilerStartFunctionType)(JSContextRef, const char *);
typedef void (*JSCProfilerEndFunctionType)(JSContextRef, const char *, const char *);
typedef void (*JSCProfilerEnableFunctionType)(void);
static NSMutableDictionary<NSValue *, NSNumber *> *RCTJSCProfilerStateMap;
static JSCProfilerStartFunctionType RCTNativeProfilerStart = NULL;
static JSCProfilerEndFunctionType RCTNativeProfilerEnd = NULL;
NS_INLINE NSValue *RCTJSContextRefKey(JSContextRef ref) {
return [NSValue valueWithPointer:ref];
}
static void RCTJSCProfilerStateInit()
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
RCTJSCProfilerStateMap = [NSMutableDictionary new];
void *JSCProfiler = dlopen(RCT_JSC_PROFILER_DYLIB, RTLD_NOW);
RCTNativeProfilerStart = (JSCProfilerStartFunctionType)dlsym(JSCProfiler, "nativeProfilerStart");
RCTNativeProfilerEnd = (JSCProfilerEndFunctionType)dlsym(JSCProfiler, "nativeProfilerEnd");
JSCProfilerEnableFunctionType enableBytecode = (__typeof__(enableBytecode))dlsym(JSCProfiler, "nativeProfilerEnableBytecode");
if (RCTNativeProfilerStart && RCTNativeProfilerEnd && enableBytecode) {
enableBytecode();
} else {
RCTNativeProfilerStart = NULL;
RCTNativeProfilerEnd = NULL;
}
});
}
#endif
void RCTJSCProfilerStart(JSContextRef ctx)
{
#if RCT_JSC_PROFILER
if (ctx != NULL) {
if (RCTJSCProfilerIsSupported()) {
NSValue *key = RCTJSContextRefKey(ctx);
BOOL isProfiling = [RCTJSCProfilerStateMap[key] boolValue];
if (!isProfiling) {
RCTLogInfo(@"Starting JSC profiler for context: %p", ctx);
RCTJSCProfilerStateMap[key] = @YES;
RCTNativeProfilerStart(ctx, JSCProfileName);
} else {
RCTLogWarn(@"Trying to start JSC profiler on a context which is already profiled.");
}
} else {
RCTLogWarn(@"Cannot start JSC profiler as it's not supported.");
}
} else {
RCTLogWarn(@"Trying to start JSC profiler for NULL context.");
}
#endif
}
NSString *RCTJSCProfilerStop(JSContextRef ctx)
{
NSString *outputFile = nil;
#if RCT_JSC_PROFILER
if (ctx != NULL) {
RCTJSCProfilerStateInit();
NSValue *key = RCTJSContextRefKey(ctx);
BOOL isProfiling = [RCTJSCProfilerStateMap[key] boolValue];
if (isProfiling) {
NSString *filename = [NSString stringWithFormat:@"cpu_profile_%ld.json", (long)CFAbsoluteTimeGetCurrent()];
outputFile = [NSTemporaryDirectory() stringByAppendingPathComponent:filename];
if (RCTNativeProfilerEnd) {
RCTNativeProfilerEnd(ctx, JSCProfileName, outputFile.UTF8String);
}
RCTLogInfo(@"Stopped JSC profiler for context: %p", ctx);
} else {
RCTLogWarn(@"Trying to stop JSC profiler on a context which is not being profiled.");
}
[RCTJSCProfilerStateMap removeObjectForKey:key];
} else {
RCTLogWarn(@"Trying to stop JSC profiler for NULL context.");
}
#endif
return outputFile;
}
BOOL RCTJSCProfilerIsProfiling(JSContextRef ctx)
{
BOOL isProfiling = NO;
#if RCT_JSC_PROFILER
if (ctx != NULL) {
RCTJSCProfilerStateInit();
isProfiling = [RCTJSCProfilerStateMap[RCTJSContextRefKey(ctx)] boolValue];
}
#endif
return isProfiling;
}
BOOL RCTJSCProfilerIsSupported(void)
{
BOOL isSupported = NO;
#if RCT_JSC_PROFILER
RCTJSCProfilerStateInit();
isSupported = (RCTNativeProfilerStart != NULL);
#endif
return isSupported;
}