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jit.attach

  jit.attach( function callback, string event )
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Description

You can attach callbacks to a number of compiler events with jit.attach. The callback can be called:

  • when a function has been compiled to bytecode ("bc");
  • when trace recording starts or stops ("trace");
  • as a trace is being recorded ("record");
  • or when a trace exits through a side exit ("texit").

Set a callback with jit.attach(callback, "event") and clear the same callback with jit.attach(callback)

This function isn't officially documented on LuaJIT wiki, use it at your own risk.
Using these constantly (especially bytecode) can be very performance heavy due to the constant stream of data being compiled at a time.

Arguments

1 function callback
The callback function.

The arguments passed to the callback depend on the event being reported:

  • "bc":
    • function func - The function that's just been recorded
  • "trace":
    • string what - description of the trace event: "flush", "start", "stop", "abort". Available for all events.
    • number tr - The trace number. Not available for flush.
    • function func - The function being traced. Available for start and abort.
    • number pc - The program counter - the bytecode number of the function being recorded (if this a Lua function). Available for start and abort.
    • number otr - start: the parent trace number if this is a side trace, abort: abort code
    • string oex - start: the exit number for the parent trace, abort: abort reason (string)
  • "record":
    • number tr - The trace number. Not available for flush.
    • function func - The function being traced. Available for start and abort.
    • number pc - The program counter - the bytecode number of the function being recorded (if this a Lua function). Available for start and abort.
    • number depth - The depth of the inlining of the current bytecode.
  • "texit":
    • number tr - The trace number. Not available for flush.
    • number ex - The exit number
    • number ngpr - The number of general-purpose and floating point registers that are active at the exit.
    • number nfpr - The number of general-purpose and floating point registers that are active at the exit.
2 string event
The event to hook into.

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