Summary:
## Motivation
We got this crash T67304907, which shows a `EXC_BAD_ACCESS / KERN_INVALID_ADDRESS` when calling this line:
```
NativeModulePerfLogger::getInstance().asyncMethodCallBatchPreprocessStart();
```
There are no arguments in that call, so I figured the only error could be when we try to invoke `getInstance()` or `asyncMethodCallBatchPreprocessStart()`.
This diff:
1. Removes the `NativeModulePerfLogger::getInstance()` bit. Now NativeModulePerfLogger is used via regular static C functions. So, there's no way that simply invoking one of the logging functions crashes the application: there's no vtable lookup.
2. Inside each logging function, when perf-logging is disabled, the global perflogger should be `nullptr`. This diff makes it so that in that case, we won't execute any code in the control group of the perf-logging experiment.
## Changes
**How do we enable NativeModule perf-logging?**
- Previously:
- `NativeModulePerfLogger::setInstance(std::make_shared<FBReactNativeModulePerfLogger>(...))`
- `TurboModulePerfLogger::setInstance(std::make_shared<FBReactNativeModulePerfLogger>(...))`.
- Now:
- `BridgeNativeModulePerfLogger::enableLogging(std::make_unique<FBReactNativeModulePerfLogger>(...))`
- `TurboModulePerfLogger::enableLogging(std::make_unique<FBReactNativeModulePerfLogger>(...))`
**How do we do NativeModule perf-logging now?**
- Previously:
- `NativeModulePerfLogger::getInstance().command(...args)`
- `TurboModulePerfLogger::getInstance().command(...args)`.
- Now:
- `BridgeNativeModulePerfLogger::command(...args)`
- `TurboModulePerfLogger::command(...args)`.
The benefit of this approach is that each method in `BridgeNativeModulePerfLogger` is guarded with an if check. Example:
```
void moduleCreateConstructStart(const char *moduleName, int32_t id) {
NativeModulePerfLogger *logger = g_perfLogger.get();
if (logger != nullptr) {
logger->moduleCreateConstructStart(moduleName, id);
}
}
```
Therefore, we don't actually execute any code when perf-logging is disabled.
Changelog:
[Internal]
Reviewed By: fkgozali
Differential Revision: D21669888
fbshipit-source-id: 80c73754c430ce787404b563878bad146295e01f
Summary:
## Description
This diff introduces `NativeModulePerfLogger`, its BUCK, Cocoapod, android-ndk targets. This diff also wires up those targets into the React Native bridge and TurboModules targets, so that we get signal on if the code compiles.
This diff also introduces `TurboModulePerfLogger`, which is a namespace that holds the `NativeModulePerfLogger` that'll do perf-logging for TurboModules.
## How will perflogging work on iOS?
1. Each application will, during React Native initialization, create a NativeModule perf logger.
2. If TurboModules are enabled, we'll call `TurboModulePerfLogger::setInstance(perfLogger)`. If TurboModules are disabled, we'll call `NativeModulePerfLogger::setInstance(perfLogger)`.
3. TurboModules, when they're created and used, will log events via `TurboModulePerfLogger::getInstance()`. NativeModules (i.e: bridge modules), when they're created and used, will log events via the `NativeModulePerfLogger::getInstance()`.
> **Note:** The NativeModule system will log events for non-TurboModules as well. Maybe we should log events for only NativeModules that conform to the `TurboModule` interface, when TurboModules are disabled. This'll ensure a fair comparison between the two systems.
## How will perflogging work on Android?
Please see the subsequent diff.
allow-large-files
Changelog:
[Both][Added] - Introduce `NativeModulePerfLogger`
Reviewed By: PeteTheHeat
Differential Revision: D21318053
fbshipit-source-id: 6ddf5b5a80bdc4076d2dd6588067e2b0ec8c2c6b
Ramanpreet Nara