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annotate third_party/luajit/src/jit/v.lua @ 178:94705b5986b3

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[ThirdParty] Added WRK and luajit for load testing.
author MrJuneJune <me@mrjunejune.com>
date Thu, 22 Jan 2026 20:10:30 -0800
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children
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178
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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1 ----------------------------------------------------------------------------
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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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 ----------------------------------------------------------------------------
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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7 --
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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8 -- This module shows verbose information about the progress of the
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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9 -- JIT compiler. It prints one line for each generated trace. This module
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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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 --
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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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 --
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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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