From 0eee70cd4d662bc0cade42aa608a031dd7426eb0 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Mon, 13 Jun 2011 01:04:23 +0200
Subject: Add -b command line option to save/list bytecode.

---
 lib/bcsave.lua | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 lib/bcsave.lua

(limited to 'lib')

diff --git a/lib/bcsave.lua b/lib/bcsave.lua
new file mode 100644
index 00000000..c34bec89
--- /dev/null
+++ b/lib/bcsave.lua
@@ -0,0 +1,125 @@
+----------------------------------------------------------------------------
+-- LuaJIT module to save/list bytecode.
+--
+-- Copyright (C) 2005-2011 Mike Pall. All rights reserved.
+-- Released under the MIT/X license. See Copyright Notice in luajit.h
+----------------------------------------------------------------------------
+--
+-- This module saves or lists the bytecode for an input file.
+-- It's run by the -b command line option.
+--
+------------------------------------------------------------------------------
+
+-- Cache some library functions and objects.
+local jit = require("jit")
+assert(jit.version_num == 20000, "LuaJIT core/library version mismatch")
+
+------------------------------------------------------------------------------
+
+local function usage()
+  io.stderr:write[[
+Save LuaJIT bytecode: luajit -b[options] input output
+  -l        Only list bytecode.
+  -s        Strip debug info (default).
+  -g        Keep debug info.
+  -e chunk  Use chunk string as input.
+  --        Stop handling options.
+  -         Use stdin as input and/or stdout as output.
+]]
+  os.exit(1)
+end
+
+local function readfile(input)
+  if type(input) == "function" then return input end
+  if input == "-" then input = nil end
+  local f, err = loadfile(input)
+  if not f then
+    io.stderr:write("luajit: ", err, "\n")
+    os.exit(1)
+  end
+  return f
+end
+
+local function readstring(input)
+  local f, err = loadstring(input)
+  if not f then
+    io.stderr:write("luajit: ", err, "\n")
+    os.exit(1)
+  end
+  return f
+end
+
+local function savefile(name, mode)
+  if name == "-" then return io.stdout end
+  local fp, err = io.open(name, mode)
+  if not fp then
+    io.stderr:write("luajit: cannot write ", err, "\n")
+    os.exit(1)
+  end
+  return fp
+end
+
+------------------------------------------------------------------------------
+
+local function bclist(input, output)
+  local f = readfile(input)
+  require("jit.bc").dump(f, savefile(output, "w"), true)
+end
+
+local function bcsave(input, output, strip)
+  local f = readfile(input)
+  local s = string.dump(f, strip)
+  local fp = savefile(output, "wb")
+  local ok, err = fp:write(s)
+  if ok and output ~= "-" then ok, err = fp:close() end
+  if not ok then
+    io.stderr:write("luajit: cannot write ", arg[2], ": ", err, "\n")
+    os.exit(1)
+  end
+end
+
+local function docmd(...)
+  local arg = {...}
+  local n = 1
+  local list = false
+  local strip = true
+  while n <= #arg do
+    local a = arg[n]
+    if type(a) == "string" and string.sub(a, 1, 1) == "-" and a ~= "-" then
+      if a == "--" then table.remove(arg, n); break end
+      for m=2,#a do
+	local opt = string.sub(a, m, m)
+	if opt == "l" then
+	  list = true
+	elseif opt == "s" then
+	  strip = true
+	elseif opt == "g" then
+	  strip = false
+	elseif opt == "e" then
+	  if n ~= 1 or #arg < 2 or m ~= #a then usage() end
+	  arg[2] = readstring(arg[2])
+	else
+	  usage()
+	end
+      end
+      table.remove(arg, n)
+    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(arg[1], arg[2], strip)
+  end
+end
+
+------------------------------------------------------------------------------
+
+-- Public module functions.
+module(...)
+
+start = docmd -- Process -b command line option.
+
-- 
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