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annotate third_party/luajit/src/jit/bc.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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