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annotate third_party/luajit/src/jit/bc.lua @ 213:60918f88070e

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Simple change regarding to accessibility.
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 21:39:43 -0800
parents 94705b5986b3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
178
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1 ----------------------------------------------------------------------------
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2 -- LuaJIT bytecode listing module.
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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 lists the bytecode of a Lua function. If it's loaded by -jbc
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9 -- it hooks into the parser and lists all functions of a chunk as they
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10 -- are parsed.
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11 --
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12 -- Example usage:
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13 --
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14 -- luajit -jbc -e 'local x=0; for i=1,1e6 do x=x+i end; print(x)'
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15 -- luajit -jbc=- foo.lua
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16 -- luajit -jbc=foo.list foo.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_LISTFILE. The file is overwritten every time the module
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21 -- is started.
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22 --
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23 -- This module can also be used programmatically:
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24 --
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25 -- local bc = require("jit.bc")
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26 --
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27 -- local function foo() print("hello") end
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28 --
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29 -- bc.dump(foo) --> -- BYTECODE -- [...]
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30 -- print(bc.line(foo, 2)) --> 0002 KSTR 1 1 ; "hello"
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31 --
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32 -- local out = {
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33 -- -- Do something with each line:
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34 -- write = function(t, ...) io.write(...) end,
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35 -- close = function(t) end,
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36 -- flush = function(t) end,
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37 -- }
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38 -- bc.dump(foo, out)
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39 --
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40 ------------------------------------------------------------------------------
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41
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42 -- Cache some library functions and objects.
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43 local jit = require("jit")
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44 local jutil = require("jit.util")
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45 local vmdef = require("jit.vmdef")
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46 local bit = require("bit")
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47 local sub, gsub, format = string.sub, string.gsub, string.format
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48 local byte, band, shr = string.byte, bit.band, bit.rshift
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49 local funcinfo, funcbc, funck = jutil.funcinfo, jutil.funcbc, jutil.funck
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50 local funcuvname = jutil.funcuvname
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51 local bcnames = vmdef.bcnames
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52 local stdout, stderr = io.stdout, io.stderr
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53
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54 ------------------------------------------------------------------------------
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55
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56 local function ctlsub(c)
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57 if c == "\n" then return "\\n"
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58 elseif c == "\r" then return "\\r"
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59 elseif c == "\t" then return "\\t"
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60 else return format("\\%03d", byte(c))
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61 end
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62 end
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63
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64 -- Return one bytecode line.
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65 local function bcline(func, pc, prefix)
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66 local ins, m = funcbc(func, pc)
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67 if not ins then return end
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68 local ma, mb, mc = band(m, 7), band(m, 15*8), band(m, 15*128)
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69 local a = band(shr(ins, 8), 0xff)
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70 local oidx = 6*band(ins, 0xff)
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71 local op = sub(bcnames, oidx+1, oidx+6)
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72 local s = format("%04d %s %-6s %3s ",
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73 pc, prefix or " ", op, ma == 0 and "" or a)
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74 local d = shr(ins, 16)
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75 if mc == 13*128 then -- BCMjump
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76 return format("%s=> %04d\n", s, pc+d-0x7fff)
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77 end
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78 if mb ~= 0 then
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79 d = band(d, 0xff)
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80 elseif mc == 0 then
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81 return s.."\n"
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82 end
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83 local kc
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84 if mc == 10*128 then -- BCMstr
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85 kc = funck(func, -d-1)
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86 kc = format(#kc > 40 and '"%.40s"~' or '"%s"', gsub(kc, "%c", ctlsub))
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87 elseif mc == 9*128 then -- BCMnum
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88 kc = funck(func, d)
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89 if op == "TSETM " then kc = kc - 2^52 end
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90 elseif mc == 12*128 then -- BCMfunc
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91 local fi = funcinfo(funck(func, -d-1))
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92 if fi.ffid then
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93 kc = vmdef.ffnames[fi.ffid]
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94 else
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95 kc = fi.loc
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96 end
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97 elseif mc == 5*128 then -- BCMuv
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98 kc = funcuvname(func, d)
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99 end
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100 if ma == 5 then -- BCMuv
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101 local ka = funcuvname(func, a)
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102 if kc then kc = ka.." ; "..kc else kc = ka end
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103 end
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104 if mb ~= 0 then
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105 local b = shr(ins, 24)
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106 if kc then return format("%s%3d %3d ; %s\n", s, b, d, kc) end
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107 return format("%s%3d %3d\n", s, b, d)
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108 end
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109 if kc then return format("%s%3d ; %s\n", s, d, kc) end
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110 if mc == 7*128 and d > 32767 then d = d - 65536 end -- BCMlits
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111 return format("%s%3d\n", s, d)
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112 end
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113
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114 -- Collect branch targets of a function.
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115 local function bctargets(func)
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116 local target = {}
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117 for pc=1,1000000000 do
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118 local ins, m = funcbc(func, pc)
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119 if not ins then break end
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120 if band(m, 15*128) == 13*128 then target[pc+shr(ins, 16)-0x7fff] = true end
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121 end
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122 return target
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123 end
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124
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125 -- Dump bytecode instructions of a function.
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126 local function bcdump(func, out, all)
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127 if not out then out = stdout end
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128 local fi = funcinfo(func)
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129 if all and fi.children then
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130 for n=-1,-1000000000,-1 do
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131 local k = funck(func, n)
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132 if not k then break end
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133 if type(k) == "proto" then bcdump(k, out, true) end
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134 end
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135 end
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136 out:write(format("-- BYTECODE -- %s-%d\n", fi.loc, fi.lastlinedefined))
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137 local target = bctargets(func)
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138 for pc=1,1000000000 do
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139 local s = bcline(func, pc, target[pc] and "=>")
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140 if not s then break end
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141 out:write(s)
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142 end
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143 out:write("\n")
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144 out:flush()
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145 end
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146
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147 ------------------------------------------------------------------------------
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148
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149 -- Active flag and output file handle.
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150 local active, out
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151
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152 -- List handler.
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153 local function h_list(func)
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154 return bcdump(func, out)
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155 end
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156
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157 -- Detach list handler.
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158 local function bclistoff()
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159 if active then
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160 active = false
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161 jit.attach(h_list)
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162 if out and out ~= stdout and out ~= stderr then out:close() end
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163 out = nil
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164 end
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165 end
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166
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167 -- Open the output file and attach list handler.
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168 local function bcliston(outfile)
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169 if active then bclistoff() end
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170 if not outfile then outfile = os.getenv("LUAJIT_LISTFILE") end
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171 if outfile then
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172 out = outfile == "-" and stdout or assert(io.open(outfile, "w"))
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173 else
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174 out = stderr
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175 end
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176 jit.attach(h_list, "bc")
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177 active = true
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178 end
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179
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180 -- Public module functions.
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181 return {
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182 line = bcline,
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183 dump = bcdump,
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184 targets = bctargets,
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185 on = bcliston,
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186 off = bclistoff,
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187 start = bcliston -- For -j command line option.
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188 }
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189