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annotate third_party/luajit/src/jit/v.lua @ 279:b3b547563ec7

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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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178
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1 ----------------------------------------------------------------------------
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2 -- Verbose mode of the LuaJIT compiler.
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3 --
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4 -- Copyright (C) 2005-2023 Mike Pall. All rights reserved.
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5 -- Released under the MIT license. See Copyright Notice in luajit.h
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6 ----------------------------------------------------------------------------
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7 --
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8 -- This module shows verbose information about the progress of the
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9 -- JIT compiler. It prints one line for each generated trace. This module
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10 -- is useful to see which code has been compiled or where the compiler
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11 -- punts and falls back to the interpreter.
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12 --
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13 -- Example usage:
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14 --
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15 -- luajit -jv -e "for i=1,1000 do for j=1,1000 do end end"
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16 -- luajit -jv=myapp.out myapp.lua
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17 --
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18 -- Default output is to stderr. To redirect the output to a file, pass a
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19 -- filename as an argument (use '-' for stdout) or set the environment
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20 -- variable LUAJIT_VERBOSEFILE. The file is overwritten every time the
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21 -- module is started.
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22 --
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23 -- The output from the first example should look like this:
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24 --
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25 -- [TRACE 1 (command line):1 loop]
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26 -- [TRACE 2 (1/3) (command line):1 -> 1]
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27 --
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28 -- The first number in each line is the internal trace number. Next are
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29 -- the file name ('(command line)') and the line number (':1') where the
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30 -- trace has started. Side traces also show the parent trace number and
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31 -- the exit number where they are attached to in parentheses ('(1/3)').
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32 -- An arrow at the end shows where the trace links to ('-> 1'), unless
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33 -- it loops to itself.
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34 --
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35 -- In this case the inner loop gets hot and is traced first, generating
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36 -- a root trace. Then the last exit from the 1st trace gets hot, too,
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37 -- and triggers generation of the 2nd trace. The side trace follows the
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38 -- path along the outer loop and *around* the inner loop, back to its
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39 -- start, and then links to the 1st trace. Yes, this may seem unusual,
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40 -- if you know how traditional compilers work. Trace compilers are full
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41 -- of surprises like this -- have fun! :-)
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42 --
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43 -- Aborted traces are shown like this:
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44 --
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45 -- [TRACE --- foo.lua:44 -- leaving loop in root trace at foo:lua:50]
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46 --
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47 -- Don't worry -- trace aborts are quite common, even in programs which
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48 -- can be fully compiled. The compiler may retry several times until it
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49 -- finds a suitable trace.
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50 --
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51 -- Of course this doesn't work with features that are not-yet-implemented
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52 -- (NYI error messages). The VM simply falls back to the interpreter. This
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53 -- may not matter at all if the particular trace is not very high up in
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54 -- the CPU usage profile. Oh, and the interpreter is quite fast, too.
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55 --
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56 -- Also check out the -jdump module, which prints all the gory details.
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57 --
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58 ------------------------------------------------------------------------------
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59
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60 -- Cache some library functions and objects.
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61 local jit = require("jit")
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62 local jutil = require("jit.util")
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63 local vmdef = require("jit.vmdef")
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64 local funcinfo, traceinfo = jutil.funcinfo, jutil.traceinfo
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65 local type, format = type, string.format
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66 local stdout, stderr = io.stdout, io.stderr
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67
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68 -- Active flag and output file handle.
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69 local active, out
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70
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71 ------------------------------------------------------------------------------
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72
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73 local startloc, startex
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74
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75 local function fmtfunc(func, pc)
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76 local fi = funcinfo(func, pc)
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77 if fi.loc then
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78 return fi.loc
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79 elseif fi.ffid then
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80 return vmdef.ffnames[fi.ffid]
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81 elseif fi.addr then
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82 return format("C:%x", fi.addr)
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83 else
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84 return "(?)"
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85 end
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86 end
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87
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88 -- Format trace error message.
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89 local function fmterr(err, info)
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90 if type(err) == "number" then
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91 if type(info) == "function" then info = fmtfunc(info) end
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92 err = format(vmdef.traceerr[err], info)
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93 end
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94 return err
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95 end
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96
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97 -- Dump trace states.
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98 local function dump_trace(what, tr, func, pc, otr, oex)
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99 if what == "start" then
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100 startloc = fmtfunc(func, pc)
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101 startex = otr and "("..otr.."/"..(oex == -1 and "stitch" or oex)..") " or ""
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102 else
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103 if what == "abort" then
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104 local loc = fmtfunc(func, pc)
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105 if loc ~= startloc then
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106 out:write(format("[TRACE --- %s%s -- %s at %s]\n",
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107 startex, startloc, fmterr(otr, oex), loc))
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108 else
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109 out:write(format("[TRACE --- %s%s -- %s]\n",
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110 startex, startloc, fmterr(otr, oex)))
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111 end
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112 elseif what == "stop" then
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113 local info = traceinfo(tr)
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114 local link, ltype = info.link, info.linktype
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115 if ltype == "interpreter" then
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116 out:write(format("[TRACE %3s %s%s -- fallback to interpreter]\n",
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117 tr, startex, startloc))
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118 elseif ltype == "stitch" then
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119 out:write(format("[TRACE %3s %s%s %s %s]\n",
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120 tr, startex, startloc, ltype, fmtfunc(func, pc)))
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121 elseif link == tr or link == 0 then
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122 out:write(format("[TRACE %3s %s%s %s]\n",
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123 tr, startex, startloc, ltype))
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124 elseif ltype == "root" then
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125 out:write(format("[TRACE %3s %s%s -> %d]\n",
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126 tr, startex, startloc, link))
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127 else
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128 out:write(format("[TRACE %3s %s%s -> %d %s]\n",
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129 tr, startex, startloc, link, ltype))
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130 end
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131 else
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132 out:write(format("[TRACE %s]\n", what))
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133 end
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134 out:flush()
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135 end
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136 end
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137
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138 ------------------------------------------------------------------------------
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139
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140 -- Detach dump handlers.
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141 local function dumpoff()
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142 if active then
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143 active = false
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144 jit.attach(dump_trace)
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145 if out and out ~= stdout and out ~= stderr then out:close() end
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146 out = nil
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147 end
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148 end
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149
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150 -- Open the output file and attach dump handlers.
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151 local function dumpon(outfile)
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152 if active then dumpoff() end
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153 if not outfile then outfile = os.getenv("LUAJIT_VERBOSEFILE") end
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154 if outfile then
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155 out = outfile == "-" and stdout or assert(io.open(outfile, "w"))
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156 else
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157 out = stderr
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158 end
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159 jit.attach(dump_trace, "trace")
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160 active = true
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161 end
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162
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163 -- Public module functions.
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164 return {
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165 on = dumpon,
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166 off = dumpoff,
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167 start = dumpon -- For -j command line option.
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168 }
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169