Hi,

Is there any recommended way (perhaps an API?) to insert instrumentation in 
JavaScript code executed by V8?

Ideally, I would expect a callback mechanism that allows me to intercept & 
change the code at different representations levels (e.g., AST, Hydrogen 
IR, or Lythium native code). My current use case is to log all the 
JavaScript instructions executed by the interpreter---this essentially 
would give me a dynamic trace of the running script.

Thanks,
Stefan

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