CODEWITHSUNDEEP
javascriptcore
Max Koretskyi
Max Koretskyi

Reputation: 105497

What does `JIT is disabled` mean in Apple's JavaScriptCore (JSC) documentation

I'm reading this documentation on NativeScript and it states the following about Apple's JavaScriptCore (JSC) Virtual Machine:

It is responsible for the JavaScript code processing. A good analogy may be made with the way Node.js processes JavaScript and translates it to the underlying system APIs. We are handling each getter/setter on JavaScript objects and dynamically call iOS APIs when needed. The virtual machine is loaded in the application's process and operates on the main UI thread. Apple does not allow JIT in AppStore Apps so the JIT is disabled in our build.

I'm curios about the bolded sentence. What does it mean? If VM is disabled, how is JavaScript interpreted?

Thanks

Upvotes: 2

Views: 1509

Answers (1)

fatfatson
fatfatson

Reputation: 885

what disabled is the JIT, not the whole VM, the VM could only execute js code in slower interpret mode, because ios will kill any 3rd process who dares to run dynamic generated code--which is the core of JIT.

Upvotes: 1

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