662 lines
		
	
	
		
			18 KiB
		
	
	
	
		
			Lua
		
	
			
		
		
	
	
			662 lines
		
	
	
		
			18 KiB
		
	
	
	
		
			Lua
		
	
----------------------------------------------------------------------------
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-- LuaJIT module to save/list bytecode.
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--
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-- Copyright (C) 2005-2017 Mike Pall. All rights reserved.
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-- Released under the MIT license. See Copyright Notice in luajit.h
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----------------------------------------------------------------------------
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--
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-- This module saves or lists the bytecode for an input file.
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-- It's run by the -b command line option.
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--
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------------------------------------------------------------------------------
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local jit = require("jit")
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assert(jit.version_num == 20100, "LuaJIT core/library version mismatch")
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local bit = require("bit")
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-- Symbol name prefix for LuaJIT bytecode.
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local LJBC_PREFIX = "luaJIT_BC_"
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------------------------------------------------------------------------------
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local function usage()
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  io.stderr:write[[
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Save LuaJIT bytecode: luajit -b[options] input output
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  -l        Only list bytecode.
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  -s        Strip debug info (default).
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  -g        Keep debug info.
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  -n name   Set module name (default: auto-detect from input name).
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  -t type   Set output file type (default: auto-detect from output name).
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  -a arch   Override architecture for object files (default: native).
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  -o os     Override OS for object files (default: native).
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  -e chunk  Use chunk string as input.
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  --        Stop handling options.
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  -         Use stdin as input and/or stdout as output.
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File types: c h obj o raw (default)
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]]
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  os.exit(1)
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end
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local function check(ok, ...)
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  if ok then return ok, ... end
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  io.stderr:write("luajit: ", ...)
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  io.stderr:write("\n")
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  os.exit(1)
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end
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local function readfile(input)
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  if type(input) == "function" then return input end
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  if input == "-" then input = nil end
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  return check(loadfile(input))
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end
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local function savefile(name, mode)
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  if name == "-" then return io.stdout end
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  return check(io.open(name, mode))
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end
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------------------------------------------------------------------------------
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local map_type = {
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  raw = "raw", c = "c", h = "h", o = "obj", obj = "obj",
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}
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local map_arch = {
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  x86 = true, x64 = true, arm = true, arm64 = true, arm64be = true,
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  ppc = true, mips = true, mipsel = true,
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}
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local map_os = {
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  linux = true, windows = true, osx = true, freebsd = true, netbsd = true,
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  openbsd = true, dragonfly = true, solaris = true,
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}
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local function checkarg(str, map, err)
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  str = string.lower(str)
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  local s = check(map[str], "unknown ", err)
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  return s == true and str or s
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end
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local function detecttype(str)
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  local ext = string.match(string.lower(str), "%.(%a+)$")
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  return map_type[ext] or "raw"
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end
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local function checkmodname(str)
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  check(string.match(str, "^[%w_.%-]+$"), "bad module name")
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  return string.gsub(str, "[%.%-]", "_")
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end
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local function detectmodname(str)
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  if type(str) == "string" then
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    local tail = string.match(str, "[^/\\]+$")
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    if tail then str = tail end
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    local head = string.match(str, "^(.*)%.[^.]*$")
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    if head then str = head end
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    str = string.match(str, "^[%w_.%-]+")
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  else
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    str = nil
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  end
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  check(str, "cannot derive module name, use -n name")
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  return string.gsub(str, "[%.%-]", "_")
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end
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------------------------------------------------------------------------------
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local function bcsave_tail(fp, output, s)
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  local ok, err = fp:write(s)
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  if ok and output ~= "-" then ok, err = fp:close() end
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  check(ok, "cannot write ", output, ": ", err)
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end
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local function bcsave_raw(output, s)
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  local fp = savefile(output, "wb")
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  bcsave_tail(fp, output, s)
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end
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local function bcsave_c(ctx, output, s)
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  local fp = savefile(output, "w")
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  if ctx.type == "c" then
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    fp:write(string.format([[
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#ifdef _cplusplus
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extern "C"
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#endif
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#ifdef _WIN32
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__declspec(dllexport)
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#endif
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const unsigned char %s%s[] = {
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]], LJBC_PREFIX, ctx.modname))
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  else
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    fp:write(string.format([[
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#define %s%s_SIZE %d
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static const unsigned char %s%s[] = {
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]], LJBC_PREFIX, ctx.modname, #s, LJBC_PREFIX, ctx.modname))
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  end
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  local t, n, m = {}, 0, 0
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  for i=1,#s do
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    local b = tostring(string.byte(s, i))
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    m = m + #b + 1
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    if m > 78 then
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      fp:write(table.concat(t, ",", 1, n), ",\n")
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      n, m = 0, #b + 1
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    end
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    n = n + 1
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    t[n] = b
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  end
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  bcsave_tail(fp, output, table.concat(t, ",", 1, n).."\n};\n")
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end
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local function bcsave_elfobj(ctx, output, s, ffi)
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  ffi.cdef[[
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typedef struct {
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  uint8_t emagic[4], eclass, eendian, eversion, eosabi, eabiversion, epad[7];
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  uint16_t type, machine;
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  uint32_t version;
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  uint32_t entry, phofs, shofs;
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  uint32_t flags;
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  uint16_t ehsize, phentsize, phnum, shentsize, shnum, shstridx;
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} ELF32header;
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typedef struct {
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  uint8_t emagic[4], eclass, eendian, eversion, eosabi, eabiversion, epad[7];
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  uint16_t type, machine;
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  uint32_t version;
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  uint64_t entry, phofs, shofs;
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  uint32_t flags;
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  uint16_t ehsize, phentsize, phnum, shentsize, shnum, shstridx;
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} ELF64header;
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typedef struct {
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  uint32_t name, type, flags, addr, ofs, size, link, info, align, entsize;
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} ELF32sectheader;
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typedef struct {
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  uint32_t name, type;
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  uint64_t flags, addr, ofs, size;
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  uint32_t link, info;
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  uint64_t align, entsize;
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} ELF64sectheader;
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typedef struct {
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  uint32_t name, value, size;
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  uint8_t info, other;
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  uint16_t sectidx;
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} ELF32symbol;
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typedef struct {
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  uint32_t name;
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  uint8_t info, other;
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  uint16_t sectidx;
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  uint64_t value, size;
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} ELF64symbol;
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typedef struct {
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  ELF32header hdr;
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  ELF32sectheader sect[6];
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  ELF32symbol sym[2];
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  uint8_t space[4096];
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} ELF32obj;
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typedef struct {
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  ELF64header hdr;
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  ELF64sectheader sect[6];
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  ELF64symbol sym[2];
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  uint8_t space[4096];
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} ELF64obj;
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]]
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  local symname = LJBC_PREFIX..ctx.modname
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  local is64, isbe = false, false
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  if ctx.arch == "x64" or ctx.arch == "arm64" or ctx.arch == "arm64be" then
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    is64 = true
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  elseif ctx.arch == "ppc" or ctx.arch == "mips" then
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    isbe = true
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  end
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  -- Handle different host/target endianess.
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  local function f32(x) return x end
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  local f16, fofs = f32, f32
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  if ffi.abi("be") ~= isbe then
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    f32 = bit.bswap
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    function f16(x) return bit.rshift(bit.bswap(x), 16) end
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    if is64 then
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      local two32 = ffi.cast("int64_t", 2^32)
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      function fofs(x) return bit.bswap(x)*two32 end
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    else
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      fofs = f32
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    end
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  end
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  -- Create ELF object and fill in header.
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  local o = ffi.new(is64 and "ELF64obj" or "ELF32obj")
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  local hdr = o.hdr
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  if ctx.os == "bsd" or ctx.os == "other" then -- Determine native hdr.eosabi.
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    local bf = assert(io.open("/bin/ls", "rb"))
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    local bs = bf:read(9)
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    bf:close()
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    ffi.copy(o, bs, 9)
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    check(hdr.emagic[0] == 127, "no support for writing native object files")
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  else
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    hdr.emagic = "\127ELF"
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    hdr.eosabi = ({ freebsd=9, netbsd=2, openbsd=12, solaris=6 })[ctx.os] or 0
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  end
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  hdr.eclass = is64 and 2 or 1
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  hdr.eendian = isbe and 2 or 1
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  hdr.eversion = 1
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  hdr.type = f16(1)
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  hdr.machine = f16(({ x86=3, x64=62, arm=40, arm64=183, arm64be=183, ppc=20, mips=8, mipsel=8 })[ctx.arch])
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  if ctx.arch == "mips" or ctx.arch == "mipsel" then
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    hdr.flags = f32(0x50001006)
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  end
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  hdr.version = f32(1)
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  hdr.shofs = fofs(ffi.offsetof(o, "sect"))
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  hdr.ehsize = f16(ffi.sizeof(hdr))
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  hdr.shentsize = f16(ffi.sizeof(o.sect[0]))
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  hdr.shnum = f16(6)
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  hdr.shstridx = f16(2)
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  -- Fill in sections and symbols.
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  local sofs, ofs = ffi.offsetof(o, "space"), 1
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  for i,name in ipairs{
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      ".symtab", ".shstrtab", ".strtab", ".rodata", ".note.GNU-stack",
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    } do
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    local sect = o.sect[i]
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    sect.align = fofs(1)
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    sect.name = f32(ofs)
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    ffi.copy(o.space+ofs, name)
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    ofs = ofs + #name+1
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  end
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  o.sect[1].type = f32(2) -- .symtab
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  o.sect[1].link = f32(3)
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  o.sect[1].info = f32(1)
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  o.sect[1].align = fofs(8)
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  o.sect[1].ofs = fofs(ffi.offsetof(o, "sym"))
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  o.sect[1].entsize = fofs(ffi.sizeof(o.sym[0]))
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  o.sect[1].size = fofs(ffi.sizeof(o.sym))
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  o.sym[1].name = f32(1)
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  o.sym[1].sectidx = f16(4)
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  o.sym[1].size = fofs(#s)
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  o.sym[1].info = 17
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  o.sect[2].type = f32(3) -- .shstrtab
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  o.sect[2].ofs = fofs(sofs)
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  o.sect[2].size = fofs(ofs)
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  o.sect[3].type = f32(3) -- .strtab
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  o.sect[3].ofs = fofs(sofs + ofs)
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  o.sect[3].size = fofs(#symname+1)
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  ffi.copy(o.space+ofs+1, symname)
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  ofs = ofs + #symname + 2
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  o.sect[4].type = f32(1) -- .rodata
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  o.sect[4].flags = fofs(2)
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  o.sect[4].ofs = fofs(sofs + ofs)
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  o.sect[4].size = fofs(#s)
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  o.sect[5].type = f32(1) -- .note.GNU-stack
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  o.sect[5].ofs = fofs(sofs + ofs + #s)
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  -- Write ELF object file.
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  local fp = savefile(output, "wb")
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  fp:write(ffi.string(o, ffi.sizeof(o)-4096+ofs))
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  bcsave_tail(fp, output, s)
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end
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local function bcsave_peobj(ctx, output, s, ffi)
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  ffi.cdef[[
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typedef struct {
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  uint16_t arch, nsects;
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  uint32_t time, symtabofs, nsyms;
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  uint16_t opthdrsz, flags;
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} PEheader;
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typedef struct {
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  char name[8];
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  uint32_t vsize, vaddr, size, ofs, relocofs, lineofs;
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  uint16_t nreloc, nline;
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  uint32_t flags;
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} PEsection;
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typedef struct __attribute((packed)) {
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  union {
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    char name[8];
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    uint32_t nameref[2];
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  };
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  uint32_t value;
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  int16_t sect;
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  uint16_t type;
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  uint8_t scl, naux;
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} PEsym;
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typedef struct __attribute((packed)) {
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  uint32_t size;
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  uint16_t nreloc, nline;
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  uint32_t cksum;
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  uint16_t assoc;
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  uint8_t comdatsel, unused[3];
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} PEsymaux;
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typedef struct {
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  PEheader hdr;
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  PEsection sect[2];
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  // Must be an even number of symbol structs.
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  PEsym sym0;
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  PEsymaux sym0aux;
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  PEsym sym1;
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  PEsymaux sym1aux;
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  PEsym sym2;
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  PEsym sym3;
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  uint32_t strtabsize;
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  uint8_t space[4096];
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} PEobj;
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]]
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  local symname = LJBC_PREFIX..ctx.modname
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  local is64 = false
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  if ctx.arch == "x86" then
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    symname = "_"..symname
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  elseif ctx.arch == "x64" then
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    is64 = true
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  end
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  local symexport = "   /EXPORT:"..symname..",DATA "
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  -- The file format is always little-endian. Swap if the host is big-endian.
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  local function f32(x) return x end
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  local f16 = f32
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  if ffi.abi("be") then
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    f32 = bit.bswap
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    function f16(x) return bit.rshift(bit.bswap(x), 16) end
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  end
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  -- Create PE object and fill in header.
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  local o = ffi.new("PEobj")
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  local hdr = o.hdr
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  hdr.arch = f16(({ x86=0x14c, x64=0x8664, arm=0x1c0, ppc=0x1f2, mips=0x366, mipsel=0x366 })[ctx.arch])
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  hdr.nsects = f16(2)
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  hdr.symtabofs = f32(ffi.offsetof(o, "sym0"))
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  hdr.nsyms = f32(6)
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  -- Fill in sections and symbols.
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  o.sect[0].name = ".drectve"
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  o.sect[0].size = f32(#symexport)
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  o.sect[0].flags = f32(0x00100a00)
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  o.sym0.sect = f16(1)
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  o.sym0.scl = 3
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  o.sym0.name = ".drectve"
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  o.sym0.naux = 1
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  o.sym0aux.size = f32(#symexport)
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  o.sect[1].name = ".rdata"
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  o.sect[1].size = f32(#s)
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  o.sect[1].flags = f32(0x40300040)
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  o.sym1.sect = f16(2)
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  o.sym1.scl = 3
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  o.sym1.name = ".rdata"
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  o.sym1.naux = 1
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  o.sym1aux.size = f32(#s)
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  o.sym2.sect = f16(2)
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  o.sym2.scl = 2
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  o.sym2.nameref[1] = f32(4)
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  o.sym3.sect = f16(-1)
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  o.sym3.scl = 2
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  o.sym3.value = f32(1)
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  o.sym3.name = "@feat.00" -- Mark as SafeSEH compliant.
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  ffi.copy(o.space, symname)
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  local ofs = #symname + 1
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  o.strtabsize = f32(ofs + 4)
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  o.sect[0].ofs = f32(ffi.offsetof(o, "space") + ofs)
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  ffi.copy(o.space + ofs, symexport)
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  ofs = ofs + #symexport
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  o.sect[1].ofs = f32(ffi.offsetof(o, "space") + ofs)
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  -- Write PE object file.
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  local fp = savefile(output, "wb")
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  fp:write(ffi.string(o, ffi.sizeof(o)-4096+ofs))
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  bcsave_tail(fp, output, s)
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end
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local function bcsave_machobj(ctx, output, s, ffi)
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  ffi.cdef[[
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typedef struct
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{
 | 
						|
  uint32_t magic, cputype, cpusubtype, filetype, ncmds, sizeofcmds, flags;
 | 
						|
} mach_header;
 | 
						|
typedef struct
 | 
						|
{
 | 
						|
  mach_header; uint32_t reserved;
 | 
						|
} mach_header_64;
 | 
						|
typedef struct {
 | 
						|
  uint32_t cmd, cmdsize;
 | 
						|
  char segname[16];
 | 
						|
  uint32_t vmaddr, vmsize, fileoff, filesize;
 | 
						|
  uint32_t maxprot, initprot, nsects, flags;
 | 
						|
} mach_segment_command;
 | 
						|
typedef struct {
 | 
						|
  uint32_t cmd, cmdsize;
 | 
						|
  char segname[16];
 | 
						|
  uint64_t vmaddr, vmsize, fileoff, filesize;
 | 
						|
  uint32_t maxprot, initprot, nsects, flags;
 | 
						|
} mach_segment_command_64;
 | 
						|
typedef struct {
 | 
						|
  char sectname[16], segname[16];
 | 
						|
  uint32_t addr, size;
 | 
						|
  uint32_t offset, align, reloff, nreloc, flags;
 | 
						|
  uint32_t reserved1, reserved2;
 | 
						|
} mach_section;
 | 
						|
typedef struct {
 | 
						|
  char sectname[16], segname[16];
 | 
						|
  uint64_t addr, size;
 | 
						|
  uint32_t offset, align, reloff, nreloc, flags;
 | 
						|
  uint32_t reserved1, reserved2, reserved3;
 | 
						|
} mach_section_64;
 | 
						|
typedef struct {
 | 
						|
  uint32_t cmd, cmdsize, symoff, nsyms, stroff, strsize;
 | 
						|
} mach_symtab_command;
 | 
						|
typedef struct {
 | 
						|
  int32_t strx;
 | 
						|
  uint8_t type, sect;
 | 
						|
  int16_t desc;
 | 
						|
  uint32_t value;
 | 
						|
} mach_nlist;
 | 
						|
typedef struct {
 | 
						|
  uint32_t strx;
 | 
						|
  uint8_t type, sect;
 | 
						|
  uint16_t desc;
 | 
						|
  uint64_t value;
 | 
						|
} mach_nlist_64;
 | 
						|
typedef struct
 | 
						|
{
 | 
						|
  uint32_t magic, nfat_arch;
 | 
						|
} mach_fat_header;
 | 
						|
typedef struct
 | 
						|
{
 | 
						|
  uint32_t cputype, cpusubtype, offset, size, align;
 | 
						|
} mach_fat_arch;
 | 
						|
typedef struct {
 | 
						|
  struct {
 | 
						|
    mach_header hdr;
 | 
						|
    mach_segment_command seg;
 | 
						|
    mach_section sec;
 | 
						|
    mach_symtab_command sym;
 | 
						|
  } arch[1];
 | 
						|
  mach_nlist sym_entry;
 | 
						|
  uint8_t space[4096];
 | 
						|
} mach_obj;
 | 
						|
typedef struct {
 | 
						|
  struct {
 | 
						|
    mach_header_64 hdr;
 | 
						|
    mach_segment_command_64 seg;
 | 
						|
    mach_section_64 sec;
 | 
						|
    mach_symtab_command sym;
 | 
						|
  } arch[1];
 | 
						|
  mach_nlist_64 sym_entry;
 | 
						|
  uint8_t space[4096];
 | 
						|
} mach_obj_64;
 | 
						|
typedef struct {
 | 
						|
  mach_fat_header fat;
 | 
						|
  mach_fat_arch fat_arch[2];
 | 
						|
  struct {
 | 
						|
    mach_header hdr;
 | 
						|
    mach_segment_command seg;
 | 
						|
    mach_section sec;
 | 
						|
    mach_symtab_command sym;
 | 
						|
  } arch[2];
 | 
						|
  mach_nlist sym_entry;
 | 
						|
  uint8_t space[4096];
 | 
						|
} mach_fat_obj;
 | 
						|
]]
 | 
						|
  local symname = '_'..LJBC_PREFIX..ctx.modname
 | 
						|
  local isfat, is64, align, mobj = false, false, 4, "mach_obj"
 | 
						|
  if ctx.arch == "x64" then
 | 
						|
    is64, align, mobj = true, 8, "mach_obj_64"
 | 
						|
  elseif ctx.arch == "arm" then
 | 
						|
    isfat, mobj = true, "mach_fat_obj"
 | 
						|
  elseif ctx.arch == "arm64" then
 | 
						|
    is64, align, isfat, mobj = true, 8, true, "mach_fat_obj"
 | 
						|
  else
 | 
						|
    check(ctx.arch == "x86", "unsupported architecture for OSX")
 | 
						|
  end
 | 
						|
  local function aligned(v, a) return bit.band(v+a-1, -a) end
 | 
						|
  local be32 = bit.bswap -- Mach-O FAT is BE, supported archs are LE.
 | 
						|
 | 
						|
  -- Create Mach-O object and fill in header.
 | 
						|
  local o = ffi.new(mobj)
 | 
						|
  local mach_size = aligned(ffi.offsetof(o, "space")+#symname+2, align)
 | 
						|
  local cputype = ({ x86={7}, x64={0x01000007}, arm={7,12}, arm64={0x01000007,0x0100000c} })[ctx.arch]
 | 
						|
  local cpusubtype = ({ x86={3}, x64={3}, arm={3,9}, arm64={3,0} })[ctx.arch]
 | 
						|
  if isfat then
 | 
						|
    o.fat.magic = be32(0xcafebabe)
 | 
						|
    o.fat.nfat_arch = be32(#cpusubtype)
 | 
						|
  end
 | 
						|
 | 
						|
  -- Fill in sections and symbols.
 | 
						|
  for i=0,#cpusubtype-1 do
 | 
						|
    local ofs = 0
 | 
						|
    if isfat then
 | 
						|
      local a = o.fat_arch[i]
 | 
						|
      a.cputype = be32(cputype[i+1])
 | 
						|
      a.cpusubtype = be32(cpusubtype[i+1])
 | 
						|
      -- Subsequent slices overlap each other to share data.
 | 
						|
      ofs = ffi.offsetof(o, "arch") + i*ffi.sizeof(o.arch[0])
 | 
						|
      a.offset = be32(ofs)
 | 
						|
      a.size = be32(mach_size-ofs+#s)
 | 
						|
    end
 | 
						|
    local a = o.arch[i]
 | 
						|
    a.hdr.magic = is64 and 0xfeedfacf or 0xfeedface
 | 
						|
    a.hdr.cputype = cputype[i+1]
 | 
						|
    a.hdr.cpusubtype = cpusubtype[i+1]
 | 
						|
    a.hdr.filetype = 1
 | 
						|
    a.hdr.ncmds = 2
 | 
						|
    a.hdr.sizeofcmds = ffi.sizeof(a.seg)+ffi.sizeof(a.sec)+ffi.sizeof(a.sym)
 | 
						|
    a.seg.cmd = is64 and 0x19 or 0x1
 | 
						|
    a.seg.cmdsize = ffi.sizeof(a.seg)+ffi.sizeof(a.sec)
 | 
						|
    a.seg.vmsize = #s
 | 
						|
    a.seg.fileoff = mach_size-ofs
 | 
						|
    a.seg.filesize = #s
 | 
						|
    a.seg.maxprot = 1
 | 
						|
    a.seg.initprot = 1
 | 
						|
    a.seg.nsects = 1
 | 
						|
    ffi.copy(a.sec.sectname, "__data")
 | 
						|
    ffi.copy(a.sec.segname, "__DATA")
 | 
						|
    a.sec.size = #s
 | 
						|
    a.sec.offset = mach_size-ofs
 | 
						|
    a.sym.cmd = 2
 | 
						|
    a.sym.cmdsize = ffi.sizeof(a.sym)
 | 
						|
    a.sym.symoff = ffi.offsetof(o, "sym_entry")-ofs
 | 
						|
    a.sym.nsyms = 1
 | 
						|
    a.sym.stroff = ffi.offsetof(o, "sym_entry")+ffi.sizeof(o.sym_entry)-ofs
 | 
						|
    a.sym.strsize = aligned(#symname+2, align)
 | 
						|
  end
 | 
						|
  o.sym_entry.type = 0xf
 | 
						|
  o.sym_entry.sect = 1
 | 
						|
  o.sym_entry.strx = 1
 | 
						|
  ffi.copy(o.space+1, symname)
 | 
						|
 | 
						|
  -- Write Macho-O object file.
 | 
						|
  local fp = savefile(output, "wb")
 | 
						|
  fp:write(ffi.string(o, mach_size))
 | 
						|
  bcsave_tail(fp, output, s)
 | 
						|
end
 | 
						|
 | 
						|
local function bcsave_obj(ctx, output, s)
 | 
						|
  local ok, ffi = pcall(require, "ffi")
 | 
						|
  check(ok, "FFI library required to write this file type")
 | 
						|
  if ctx.os == "windows" then
 | 
						|
    return bcsave_peobj(ctx, output, s, ffi)
 | 
						|
  elseif ctx.os == "osx" then
 | 
						|
    return bcsave_machobj(ctx, output, s, ffi)
 | 
						|
  else
 | 
						|
    return bcsave_elfobj(ctx, output, s, ffi)
 | 
						|
  end
 | 
						|
end
 | 
						|
 | 
						|
------------------------------------------------------------------------------
 | 
						|
 | 
						|
local function bclist(input, output)
 | 
						|
  local f = readfile(input)
 | 
						|
  require("jit.bc").dump(f, savefile(output, "w"), true)
 | 
						|
end
 | 
						|
 | 
						|
local function bcsave(ctx, input, output)
 | 
						|
  local f = readfile(input)
 | 
						|
  local s = string.dump(f, ctx.strip)
 | 
						|
  local t = ctx.type
 | 
						|
  if not t then
 | 
						|
    t = detecttype(output)
 | 
						|
    ctx.type = t
 | 
						|
  end
 | 
						|
  if t == "raw" then
 | 
						|
    bcsave_raw(output, s)
 | 
						|
  else
 | 
						|
    if not ctx.modname then ctx.modname = detectmodname(input) end
 | 
						|
    if t == "obj" then
 | 
						|
      bcsave_obj(ctx, output, s)
 | 
						|
    else
 | 
						|
      bcsave_c(ctx, output, s)
 | 
						|
    end
 | 
						|
  end
 | 
						|
end
 | 
						|
 | 
						|
local function docmd(...)
 | 
						|
  local arg = {...}
 | 
						|
  local n = 1
 | 
						|
  local list = false
 | 
						|
  local ctx = {
 | 
						|
    strip = true, arch = jit.arch, os = string.lower(jit.os),
 | 
						|
    type = false, modname = false,
 | 
						|
  }
 | 
						|
  while n <= #arg do
 | 
						|
    local a = arg[n]
 | 
						|
    if type(a) == "string" and string.sub(a, 1, 1) == "-" and a ~= "-" then
 | 
						|
      table.remove(arg, n)
 | 
						|
      if a == "--" then break end
 | 
						|
      for m=2,#a do
 | 
						|
	local opt = string.sub(a, m, m)
 | 
						|
	if opt == "l" then
 | 
						|
	  list = true
 | 
						|
	elseif opt == "s" then
 | 
						|
	  ctx.strip = true
 | 
						|
	elseif opt == "g" then
 | 
						|
	  ctx.strip = false
 | 
						|
	else
 | 
						|
	  if arg[n] == nil or m ~= #a then usage() end
 | 
						|
	  if opt == "e" then
 | 
						|
	    if n ~= 1 then usage() end
 | 
						|
	    arg[1] = check(loadstring(arg[1]))
 | 
						|
	  elseif opt == "n" then
 | 
						|
	    ctx.modname = checkmodname(table.remove(arg, n))
 | 
						|
	  elseif opt == "t" then
 | 
						|
	    ctx.type = checkarg(table.remove(arg, n), map_type, "file type")
 | 
						|
	  elseif opt == "a" then
 | 
						|
	    ctx.arch = checkarg(table.remove(arg, n), map_arch, "architecture")
 | 
						|
	  elseif opt == "o" then
 | 
						|
	    ctx.os = checkarg(table.remove(arg, n), map_os, "OS name")
 | 
						|
	  else
 | 
						|
	    usage()
 | 
						|
	  end
 | 
						|
	end
 | 
						|
      end
 | 
						|
    else
 | 
						|
      n = n + 1
 | 
						|
    end
 | 
						|
  end
 | 
						|
  if list then
 | 
						|
    if #arg == 0 or #arg > 2 then usage() end
 | 
						|
    bclist(arg[1], arg[2] or "-")
 | 
						|
  else
 | 
						|
    if #arg ~= 2 then usage() end
 | 
						|
    bcsave(ctx, arg[1], arg[2])
 | 
						|
  end
 | 
						|
end
 | 
						|
 | 
						|
------------------------------------------------------------------------------
 | 
						|
 | 
						|
-- Public module functions.
 | 
						|
return {
 | 
						|
  start = docmd -- Process -b command line option.
 | 
						|
}
 | 
						|
 |