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- Subject: Re: Use byte-code directly?
- From: Fabio Mascarenhas <fabiomasc@...>
- Date: Sat, 18 Sep 2004 00:58:24 -0300
George Warner wrote:
Oh I believe you 100%. But unless you expect me to post all the other 160+
routines from this core library to the list (don't worry, won't happen) for
you to reverse engineer I was kinda hoping for a more automated solution.
If the routines aren't that big and you're the one that wrote them in
the first place then I think you would go pretty quickly. Decompiling
Lua opcodes is non-trivial, this is not a stack-based machine like
Java's, or Smalltalk's, decompiling Lua code is more like decompiling C
Thanks for the translation thou. It was kinda interesting getting the magic
behind the smoke and mirrors explained. Wish now I had chosen a more complex
example. He he.
The VM isn't really complex, you see. :-) After you figure how upvalues
and call/return work it should be a breeze, specially with your memory
of the routines to guide you. If you're not the original author then
partner with him on this. :-) And of course you have luac to check if
you're doing it right (and understand the compilation will help you do
the reverse process).
While surfing I did run across a windoze app called LuaDC.exe. I tried
running it on W98 and it launched a command-line window (which closed before
I could read anything) so I then tried it with DOS where it told me it
required windows. Anyone know of a Linux type app that will do this?
I did a google search for LuaDC and found version 0.9.20. Don't bother
to find sources, it isn't for Lua 5. :-) Even if you found the source,
porting it to Lua 5 would need a full rewrite; the Lua VM changed a lot
in Lua 5 (it was stack-based before).