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STARTUP.md

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iOS vs Android startup notes

Android

Build time

At SDK build time, ./android/titanium/prebuild.js script is run which takes JS files (from ./android/runtime/common/src/js) and generates C char*

  • This is done to "bake in" the source to avoid disk I/O slowdown

Runtime

App.java

  • create app info, set up encryption asset helper stuff
  • create asset cache
  • load Ti.App data into analytics class
  • create V8Runtime
  • register external modules (id -> class)
  • then call...

V8Runtime#nativeInit()

  • from java down to JNI
  • sets up platform, isolate, debugger, then calls... V8Runtime#bootstrap()
  • sets up EventEmitter in C code
  • creates kroll object, calls into KrollBindings.cpp to hang binding/externalBinding functions for grabbing a builtin/native module
  • hangs EventEmitter, DBG, runtime, log method properties off kroll object
    • (Note that kroll.log may not add newlines at end?)

kroll.js is parsed then invoked

  • holds a function that does initial kernel bootstrapping
  • creates a global.kroll object
  • hangs NativeModule off of it which is a way to load the baked in JS code from build time
  • hangs global.Ti from loading baked-in titanium.js
    • This ends up calling KrollBindings#initTitanium() which sets up Proxy/KrollProxy/KrollModule/TitaniumModule in C
    • Also does bootsrapping of other baked in JS code for extensions like ui/network/properties/locale
    • bootstrap.js file is loaded?!
  • hangs global.Module from loading baked-in module.js
    • This effectively sets up our require() implementation
  • hangs global.console from loading baked-in console.js
    • piggy-backs on Ti.API

back to V8Runtime#bootstrap()

  • set up global.global
  • set default global.__dirname and __filename

back to java V8Runtime#initRuntime()

  • start debugger
  • load external native modules

... then?

  • The root splash screen activity TiLaunchActivity calls TiApplication.launch() to start the JS runtime.
  • which eventually calls from Java -> JNI -> C to global.Module.runModule() (or if we have a snapshot, it does global._startSnapshot(global))
  • When TiLaunchActivity is destroyed, the JS runtime will be terminated.