<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.&#xA;&#xA;The arguments passed to the callback depend on the event being reported:&#xA;&#xA;* &quot;bc&quot;:&#xA;&lt;page&gt;function&lt;/page&gt; func - The function that&#x27;s just been recorded&#xA;&#xA;&#xA;&#xA;* &quot;trace&quot;:&#xA;&lt;page&gt;string&lt;/page&gt; what - description of the trace event: &quot;flush&quot;, &quot;start&quot;, &quot;stop&quot;, &quot;abort&quot;. Available for all events.&#xA;&#xA;&#xA;&lt;page&gt;number&lt;/page&gt; tr - The trace number. Not available for flush.&#xA;&#xA;&#xA;&lt;page&gt;function&lt;/page&gt; func - The function being traced. Available for start and abort.&#xA;&#xA;&#xA;&lt;page&gt;number&lt;/page&gt; pc - The program counter - the bytecode number of the function being recorded (if this a Lua function). Available for start and abort.&#xA;&#xA;&#xA;&lt;page&gt;number&lt;/page&gt; otr - start: the parent trace number if this is a side trace, abort: abort code&#xA;&#xA;&#xA;&lt;page&gt;string&lt;/page&gt; oex - start: the exit number for the parent trace, abort: abort reason (string)&#xA;&#xA;&#xA;&#xA;* &quot;record&quot;:&#xA;&lt;page&gt;number&lt;/page&gt; tr - The trace number. Not available for flush.&#xA;&#xA;&#xA;&lt;page&gt;function&lt;/page&gt; func - The function being traced. Available for start and abort.&#xA;&#xA;&#xA;&lt;page&gt;number&lt;/page&gt; pc - The program counter - the bytecode number of the function being recorded (if this a Lua function). Available for start and abort.&#xA;&#xA;&#xA;&lt;page&gt;number&lt;/page&gt; depth - The depth of the inlining of the current bytecode.&#xA;&#xA;&#xA;&#xA;* &quot;texit&quot;:&#xA;&lt;page&gt;number&lt;/page&gt; tr - The trace number. Not available for flush.&#xA;&#xA;&#xA;&lt;page&gt;number&lt;/page&gt; ex - The exit number&#xA;&#xA;&#xA;&lt;page&gt;number&lt;/page&gt; ngpr - The number of general-purpose and floating point registers that are active at the exit.&#xA;&#xA;&#xA;&lt;page&gt;number&lt;/page&gt; nfpr - The number of general-purpose and floating point registers that are active at the exit.</arg>⤶ <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>