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annotate third_party/luajit/src/host/genlibbc.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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rev   line source
178
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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1 ----------------------------------------------------------------------------
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2 -- Lua script to dump the bytecode of the library functions written in Lua.
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3 -- The resulting 'buildvm_libbc.h' is used for the build process of LuaJIT.
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4 ----------------------------------------------------------------------------
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5 -- Copyright (C) 2005-2023 Mike Pall. All rights reserved.
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6 -- Released under the MIT license. See Copyright Notice in luajit.h
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7 ----------------------------------------------------------------------------
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8
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9 local ffi = require("ffi")
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10 local bit = require("bit")
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11 local vmdef = require("jit.vmdef")
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12 local bcnames = vmdef.bcnames
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13
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14 local format = string.format
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15
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16 local isbe = (string.byte(string.dump(function() end), 5) % 2 == 1)
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17
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18 local function usage(arg)
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19 io.stderr:write("Usage: ", arg and arg[0] or "genlibbc",
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20 " [-o buildvm_libbc.h] lib_*.c\n")
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21 os.exit(1)
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22 end
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23
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24 local function parse_arg(arg)
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25 local outfile = "-"
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26 if not (arg and arg[1]) then
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27 usage(arg)
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28 end
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29 if arg[1] == "-o" then
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30 outfile = arg[2]
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31 if not outfile then usage(arg) end
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32 table.remove(arg, 1)
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33 table.remove(arg, 1)
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34 end
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35 return outfile
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36 end
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37
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38 local function read_files(names)
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39 local src = ""
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40 for _,name in ipairs(names) do
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41 local fp = assert(io.open(name))
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42 src = src .. fp:read("*a")
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43 fp:close()
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44 end
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45 return src
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46 end
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47
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48 local function transform_lua(code)
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49 local fixup = {}
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50 local n = -30000
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51 code = string.gsub(code, "CHECK_(%w*)%((.-)%)", function(tp, var)
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52 n = n + 1
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53 fixup[n] = { "CHECK", tp }
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54 return format("%s=%d", var, n)
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55 end)
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56 code = string.gsub(code, "PAIRS%((.-)%)", function(var)
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57 fixup.PAIRS = true
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58 return format("nil, %s, 0x4dp80", var)
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59 end)
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60 return "return "..code, fixup
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61 end
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62
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63 local function read_uleb128(p)
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64 local v = p[0]; p = p + 1
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65 if v >= 128 then
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66 local sh = 7; v = v - 128
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67 repeat
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68 local r = p[0]
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69 v = v + bit.lshift(bit.band(r, 127), sh)
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70 sh = sh + 7
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71 p = p + 1
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72 until r < 128
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73 end
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74 return p, v
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75 end
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76
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77 -- ORDER LJ_T
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78 local name2itype = {
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79 str = 5, func = 9, tab = 12, int = 14, num = 15
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80 }
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81
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82 local BC, BCN = {}, {}
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83 for i=0,#bcnames/6-1 do
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84 local name = bcnames:sub(i*6+1, i*6+6):gsub(" ", "")
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85 BC[name] = i
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86 BCN[i] = name
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87 end
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88 local xop, xra = isbe and 3 or 0, isbe and 2 or 1
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89 local xrc, xrb = isbe and 1 or 2, isbe and 0 or 3
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90
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91 local function fixup_dump(dump, fixup)
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92 local buf = ffi.new("uint8_t[?]", #dump+1, dump)
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93 local p = buf+5
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94 local n, sizebc
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95 p, n = read_uleb128(p)
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96 local start = p
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97 p = p + 4
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98 p = read_uleb128(p)
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99 p = read_uleb128(p)
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100 p, sizebc = read_uleb128(p)
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101 local startbc = tonumber(p - start)
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102 local rawtab = {}
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103 for i=0,sizebc-1 do
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104 local op = p[xop]
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105 if op == BC.KSHORT then
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106 local rd = p[xrc] + 256*p[xrb]
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107 rd = bit.arshift(bit.lshift(rd, 16), 16)
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108 local f = fixup[rd]
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109 if f then
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110 if f[1] == "CHECK" then
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111 local tp = f[2]
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112 if tp == "tab" then rawtab[p[xra]] = true end
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113 p[xop] = tp == "num" and BC.ISNUM or BC.ISTYPE
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114 p[xrb] = 0
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115 p[xrc] = name2itype[tp]
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116 else
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117 error("unhandled fixup type: "..f[1])
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118 end
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119 end
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120 elseif op == BC.TGETV then
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121 if rawtab[p[xrb]] then
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122 p[xop] = BC.TGETR
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123 end
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124 elseif op == BC.TSETV then
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125 if rawtab[p[xrb]] then
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126 p[xop] = BC.TSETR
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127 end
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128 elseif op == BC.ITERC then
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129 if fixup.PAIRS then
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130 p[xop] = BC.ITERN
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131 end
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132 end
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133 p = p + 4
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134 end
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135 local ndump = ffi.string(start, n)
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136 -- Fixup hi-part of 0x4dp80 to LJ_KEYINDEX.
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137 ndump = ndump:gsub("\x80\x80\xcd\xaa\x04", "\xff\xff\xf9\xff\x0f")
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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138 return { dump = ndump, startbc = startbc, sizebc = sizebc }
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139 end
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140
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141 local function find_defs(src)
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MrJuneJune <me@mrjunejune.com>
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142 local defs = {}
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143 for name, code in string.gmatch(src, "LJLIB_LUA%(([^)]*)%)%s*/%*(.-)%*/") do
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144 local env = {}
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145 local tcode, fixup = transform_lua(code)
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146 local func = assert(load(tcode, "", nil, env))()
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147 defs[name] = fixup_dump(string.dump(func, true), fixup)
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148 defs[#defs+1] = name
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149 end
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150 return defs
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151 end
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152
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153 local function gen_header(defs)
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MrJuneJune <me@mrjunejune.com>
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154 local t = {}
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155 local function w(x) t[#t+1] = x end
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156 w("/* This is a generated file. DO NOT EDIT! */\n\n")
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157 w("static const int libbc_endian = ") w(isbe and 1 or 0) w(";\n\n")
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158 local s, sb = "", ""
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159 for i,name in ipairs(defs) do
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160 local d = defs[name]
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161 s = s .. d.dump
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162 sb = sb .. string.char(i) .. ("\0"):rep(d.startbc - 1)
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163 .. (isbe and "\0\0\0\255" or "\255\0\0\0"):rep(d.sizebc)
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164 .. ("\0"):rep(#d.dump - d.startbc - d.sizebc*4)
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165 end
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166 w("static const uint8_t libbc_code[] = {\n")
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167 local n = 0
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168 for i=1,#s do
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169 local x = string.byte(s, i)
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170 local xb = string.byte(sb, i)
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171 if xb == 255 then
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MrJuneJune <me@mrjunejune.com>
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172 local name = BCN[x]
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MrJuneJune <me@mrjunejune.com>
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173 local m = #name + 4
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174 if n + m > 78 then n = 0; w("\n") end
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175 n = n + m
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176 w("BC_"); w(name)
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177 else
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178 local m = x < 10 and 2 or (x < 100 and 3 or 4)
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179 if xb == 0 then
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180 if n + m > 78 then n = 0; w("\n") end
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181 else
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182 local name = defs[xb]:gsub("_", ".")
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183 if n ~= 0 then w("\n") end
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184 w("/* "); w(name); w(" */ ")
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185 n = #name + 7
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186 end
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187 n = n + m
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188 w(x)
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189 end
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MrJuneJune <me@mrjunejune.com>
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190 w(",")
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191 end
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192 w("\n0\n};\n\n")
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193 w("static const struct { const char *name; int ofs; } libbc_map[] = {\n")
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194 local m = 0
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195 for _,name in ipairs(defs) do
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196 w('{"'); w(name); w('",'); w(m) w('},\n')
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197 m = m + #defs[name].dump
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198 end
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199 w("{NULL,"); w(m); w("}\n};\n\n")
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200 return table.concat(t)
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parents:
diff changeset
201 end
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MrJuneJune <me@mrjunejune.com>
parents:
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202
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
203 local function write_file(name, data)
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MrJuneJune <me@mrjunejune.com>
parents:
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204 if name == "-" then
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
205 assert(io.write(data))
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
206 assert(io.flush())
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
207 else
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
208 local fp = io.open(name)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
209 if fp then
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
210 local old = fp:read("*a")
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
211 fp:close()
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
212 if data == old then return end
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parents:
diff changeset
213 end
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
214 fp = assert(io.open(name, "w"))
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parents:
diff changeset
215 assert(fp:write(data))
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
216 assert(fp:close())
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
217 end
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
218 end
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
219
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
220 local outfile = parse_arg(arg)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
221 local src = read_files(arg)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
222 local defs = find_defs(src)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
223 local hdr = gen_header(defs)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
224 write_file(outfile, hdr)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
225