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Add Google connector service and agent wiki Implement the C/Seobeo Google Drive and Gmail connector with encrypted OAuth storage, Zenbu authentication, browser testing, AI tool discovery, chunked HTTP decoding, and Bazel coverage. Consolidate repository guidance into progressive wiki documentation and enforce arena-first allocation for new first-party C code. Co-authored-by: Copilot <[email protected]> Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
author MrJuneJune <me@mrjunejune.com>
date Mon, 17 Aug 2026 22:22:36 -0700
parents 94705b5986b3
children
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1 <!DOCTYPE html>
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2 <html>
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3 <head>
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4 <title>jit.* Library</title>
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5 <meta charset="utf-8">
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6 <meta name="Copyright" content="Copyright (C) 2005-2023">
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7 <meta name="Language" content="en">
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8 <link rel="stylesheet" type="text/css" href="bluequad.css" media="screen">
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9 <link rel="stylesheet" type="text/css" href="bluequad-print.css" media="print">
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10 </head>
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11 <body>
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12 <div id="site">
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13 <a href="https://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
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14 </div>
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15 <div id="head">
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16 <h1><tt>jit.*</tt> Library</h1>
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17 </div>
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18 <div id="nav">
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19 <ul><li>
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20 <a href="luajit.html">LuaJIT</a>
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21 <ul><li>
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22 <a href="https://luajit.org/download.html">Download <span class="ext">&raquo;</span></a>
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23 </li><li>
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24 <a href="install.html">Installation</a>
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25 </li><li>
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26 <a href="running.html">Running</a>
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27 </li></ul>
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28 </li><li>
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29 <a href="extensions.html">Extensions</a>
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30 <ul><li>
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31 <a href="ext_ffi.html">FFI Library</a>
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32 <ul><li>
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33 <a href="ext_ffi_tutorial.html">FFI Tutorial</a>
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34 </li><li>
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35 <a href="ext_ffi_api.html">ffi.* API</a>
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36 </li><li>
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37 <a href="ext_ffi_semantics.html">FFI Semantics</a>
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38 </li></ul>
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39 </li><li>
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40 <a href="ext_buffer.html">String Buffers</a>
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41 </li><li>
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42 <a class="current" href="ext_jit.html">jit.* Library</a>
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43 </li><li>
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44 <a href="ext_c_api.html">Lua/C API</a>
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45 </li><li>
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46 <a href="ext_profiler.html">Profiler</a>
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47 </li></ul>
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48 </li><li>
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49 <a href="https://luajit.org/status.html">Status <span class="ext">&raquo;</span></a>
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50 </li><li>
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51 <a href="https://luajit.org/faq.html">FAQ <span class="ext">&raquo;</span></a>
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52 </li><li>
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53 <a href="https://luajit.org/list.html">Mailing List <span class="ext">&raquo;</span></a>
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54 </li></ul>
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55 </div>
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56 <div id="main">
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57 <p>
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58 The functions in this built-in module control the behavior of the JIT
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59 compiler engine. Note that JIT-compilation is fully automatic &mdash;
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60 you probably won't need to use any of the following functions unless
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61 you have special needs.
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62 </p>
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63
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64 <h3 id="jit_onoff"><tt>jit.on()<br>
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65 jit.off()</tt></h3>
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66 <p>
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67 Turns the whole JIT compiler on (default) or off.
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68 </p>
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69 <p>
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70 These functions are typically used with the command line options
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71 <tt>-j on</tt> or <tt>-j off</tt>.
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72 </p>
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73
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74 <h3 id="jit_flush"><tt>jit.flush()</tt></h3>
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75 <p>
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76 Flushes the whole cache of compiled code.
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77 </p>
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78
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79 <h3 id="jit_onoff_func"><tt>jit.on(func|true [,true|false])<br>
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80 jit.off(func|true [,true|false])<br>
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81 jit.flush(func|true [,true|false])</tt></h3>
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82 <p>
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83 <tt>jit.on</tt> enables JIT compilation for a Lua function (this is
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84 the default).
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85 </p>
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86 <p>
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87 <tt>jit.off</tt> disables JIT compilation for a Lua function and
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88 flushes any already compiled code from the code cache.
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89 </p>
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90 <p>
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91 <tt>jit.flush</tt> flushes the code, but doesn't affect the
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92 enable/disable status.
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93 </p>
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94 <p>
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95 The current function, i.e. the Lua function calling this library
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96 function, can also be specified by passing <tt>true</tt> as the first
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97 argument.
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98 </p>
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99 <p>
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100 If the second argument is <tt>true</tt>, JIT compilation is also
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101 enabled, disabled or flushed recursively for all sub-functions of a
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102 function. With <tt>false</tt> only the sub-functions are affected.
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103 </p>
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104 <p>
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105 The <tt>jit.on</tt> and <tt>jit.off</tt> functions only set a flag
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106 which is checked when the function is about to be compiled. They do
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107 not trigger immediate compilation.
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108 </p>
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109 <p>
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110 Typical usage is <tt>jit.off(true, true)</tt> in the main chunk
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111 of a module to turn off JIT compilation for the whole module for
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112 debugging purposes.
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113 </p>
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114
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115 <h3 id="jit_flush_tr"><tt>jit.flush(tr)</tt></h3>
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116 <p>
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117 Flushes the root trace, specified by its number, and all of its side
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118 traces from the cache. The code for the trace will be retained as long
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119 as there are any other traces which link to it.
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120 </p>
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121
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122 <h3 id="jit_status"><tt>status, ... = jit.status()</tt></h3>
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123 <p>
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124 Returns the current status of the JIT compiler. The first result is
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125 either <tt>true</tt> or <tt>false</tt> if the JIT compiler is turned
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126 on or off. The remaining results are strings for CPU-specific features
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127 and enabled optimizations.
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128 </p>
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129
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130 <h3 id="jit_version"><tt>jit.version</tt></h3>
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131 <p>
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132 Contains the LuaJIT version string.
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133 </p>
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134
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135 <h3 id="jit_version_num"><tt>jit.version_num</tt></h3>
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136 <p>
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137 Contains the version number of the LuaJIT core. Version xx.yy.zz
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138 is represented by the decimal number xxyyzz.<br>
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139 <b>DEPRECATED after the switch to
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140 <a href="https://luajit.org/status.html#release"><span class="ext">&raquo;</span>&nbsp;rolling releases</a>. zz is frozen at 99.</b>
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141 </p>
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142
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143 <h3 id="jit_os"><tt>jit.os</tt></h3>
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144 <p>
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145 Contains the target OS name:
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146 "Windows", "Linux", "OSX", "BSD", "POSIX" or "Other".
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147 </p>
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148
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149 <h3 id="jit_arch"><tt>jit.arch</tt></h3>
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150 <p>
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151 Contains the target architecture name:
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152 "x86", "x64", "arm", "arm64", "arm64be", "ppc", "mips", "mipsel", "mips64", "mips64el", "mips64r6", "mips64r6el".
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153 </p>
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154
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155 <h2 id="jit_opt"><tt>jit.opt.*</tt> &mdash; JIT compiler optimization control</h2>
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156 <p>
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157 This submodule provides the backend for the <tt>-O</tt> command line
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158 option.
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159 </p>
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160 <p>
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161 You can also use it programmatically, e.g.:
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162 </p>
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163 <pre class="code">
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164 jit.opt.start(2) -- same as -O2
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165 jit.opt.start("-dce")
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166 jit.opt.start("hotloop=10", "hotexit=2")
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167 </pre>
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168 <p>
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169 Unlike in LuaJIT 1.x, the module is built-in and
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170 <b>optimization is turned on by default!</b>
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171 It's no longer necessary to run <tt>require("jit.opt").start()</tt>,
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172 which was one of the ways to enable optimization.
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173 </p>
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174
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175 <h2 id="jit_util"><tt>jit.util.*</tt> &mdash; JIT compiler introspection</h2>
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176 <p>
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177 This submodule holds functions to introspect the bytecode, generated
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178 traces, the IR and the generated machine code. The functionality
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179 provided by this module is still in flux and therefore undocumented.
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180 </p>
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181 <p>
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182 The debug modules <tt>-jbc</tt>, <tt>-jv</tt> and <tt>-jdump</tt> make
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183 extensive use of these functions. Please check out their source code,
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184 if you want to know more.
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185 </p>
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186 <br class="flush">
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187 </div>
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188 <div id="foot">
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189 <hr class="hide">
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190 Copyright &copy; 2005-2023
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191 <span class="noprint">
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192 &middot;
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193 <a href="contact.html">Contact</a>
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194 </span>
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195 </div>
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196 </body>
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197 </html>