lua 64-bit transitioning issue

Question

Hi,

I really hope there is some help to get on this subject. Has anyone ever used lua in an application that needs to have both 32-bit and 64-bit support? We are currently transitioning to 64-bit but are having trouble with client compiled lua scripts that we can't recompile ourselves using the 64-bit version. So in effect we need to be able to load bytecode files compiled using 32-bit lua in a 64-bit application. When we try to do so we receive an error message:

virtual machine mismatch in test.bin.lua: size of size_t is 8 but read 4

Well of course this is a clear 64bit transitioning problem. The hard thing is just to figure out what to do about it without the ability to recompile the binaries.

Thanks

Answer 1

You could try LuaDec: "LuaDec is a decompiler for the Lua language." I don't know much about it, and the website states that it targets Lua 5.0.2. So, it may not work out of the box, but it's better than starting from scratch.

Answer 2

It's not hard to adapt lundump.c to read 32-bit bytecode files. I've posted a roadmap for this in the Lua mailing list. If you have problems, please send me email.