Obj-C++ TurboModules leak memory – 600 bytes per a method call

[sjchmiela]

Calling TurboModules methods results in an increased memory usage. Increased memory usage may cause the app to crash.

Platform: iOS

React Native version:

System:
    OS: macOS 10.15.1
    CPU: (8) x64 Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
    Memory: 340.77 MB / 16.00 GB
    Shell: 5.6.2 - /usr/local/bin/zsh
  Binaries:
    Node: 12.7.0 - ~/.asdf/installs/nodejs/12.7.0/bin/node
    Yarn: 1.17.3 - /usr/local/bin/yarn
    npm: 6.10.0 - ~/.asdf/installs/nodejs/12.7.0/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  SDKs:
    iOS SDK:
      Platforms: iOS 13.2, DriverKit 19.0, macOS 10.15, tvOS 13.2, watchOS 6.1
    Android SDK:
      API Levels: 26, 28
      Build Tools: 23.0.1, 26.0.1, 26.0.3, 27.0.3, 28.0.2, 28.0.3
      System Images: android-24 | Google Play Intel x86 Atom
  IDEs:
    Android Studio: 3.5 AI-191.8026.42.35.5791312
    Xcode: 11.2.1/11B500 - /usr/bin/xcodebuild
  npmPackages:
    react: 16.9.0 => 16.9.0 
    react-native: 0.61.5 => 0.61.5

Steps To Reproduce

Executing the following code block

const SampleTurboModule = TurboModuleRegistry.get('SampleTurboModule');

let i = 0;
while (i < 100000) {
  SampleTurboModule.getNumber(i);
  i += 1;
}

results in a 60 MB memory usage increase.

Link to a repository with a reproducing example:

https://github.com/sjchmiela/TurboModulesLeakExample