Revision Difference
jit.attach#511494
<function name="attach" parent="jit" type="libraryfunc">⤶
<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)⤶
⤶
<warning>This function isn't officially documented on LuJIT wiki, use it at your own risk.</warning>⤶
</description>⤶
<realm>Shared and Menu</realm>⤶
<args>⤶
<arg name="callback" type="function">The callback function.

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

* "bc":
<page>function</page> func - The function that's just been recorded



* "trace":
<page>string</page> what - description of the trace event: "flush", "start", "stop", "abort". Available for all events.


<page>number</page> tr - The trace number. Not available for flush.


<page>function</page> func - The function being traced. Available for start and abort.


<page>number</page> pc - The program counter - the bytecode number of the function being recorded (if this a Lua function). Available for start and abort.


<page>number</page> otr - start: the parent trace number if this is a side trace, abort: abort code


<page>string</page> oex - start: the exit number for the parent trace, abort: abort reason (string)



* "record":
<page>number</page> tr - The trace number. Not available for flush.


<page>function</page> func - The function being traced. Available for start and abort.


<page>number</page> pc - The program counter - the bytecode number of the function being recorded (if this a Lua function). Available for start and abort.


<page>number</page> depth - The depth of the inlining of the current bytecode.



* "texit":
<page>number</page> tr - The trace number. Not available for flush.


<page>number</page> ex - The exit number


<page>number</page> ngpr - The number of general-purpose and floating point registers that are active at the exit.


<page>number</page> nfpr - The number of general-purpose and floating point registers that are active at the exit.</arg>⤶
<arg name="event" type="string">The event to hook into.</arg>⤶
</args>⤶
</function>⤶
⤶
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