Lua Bytecode

OZApps · February 2012

This is a question specifically for Atilim/Gorkem, one of the good things with Gideros is that we have to compile the app ourselves for the platform that we want. Which means all the relevant lua files are also compiled into bytecode using luac before being compiled into the final app.

So If I offer a library as a mylibrary.lua (luac compiled) than the source code in text format, this would still work as would a text based source code, right? This would be so much better as in C*SDK the only way to offer the code is in full text based which is hardly any protection of the code. Are there going to be any concerns, I believe there could be issues if the file was compiled manually using luac (64-bit) while I guess the devices work well or only work with the 32-bit versions, is that right? Any light on this

GregBUG · February 2012

do not take this like an official answer but...

i also asked at atilim the same (with private msg)
and yes you are right.
...
" luac is a 32-bit application and generates 32-bit lua bytecodes. Although these generated bytecodes will work on Windows, Android and iOS, they won't work on 64-bit Mac OS X"

Ciao
Gianluca.

MikeHart · February 2012

...

atilim · February 2012

Gianluca's answer can be accepted as an official answer

...

I always forget what "..." mean? :-?

MikeHart · February 2012

Implement a delete post option for the very last one and you won't see it anymore. :-)
I had told OzApps already about what you had told me (how to compile and use your lua files), that is what I had written before.

Btw @Atilim, you told me that always the 32 bit version of LUAC should be used. This is contrary to what @GregBug mentioned.

atilim · February 2012

oh now I remembered what I've told you. But yes, 32-bit lua bytecodes won't work on 64-bit Mac OS X. My mistake.

OZApps · February 2012

Hi All, my question still remains, I had heard that if I compile on the Mac (which would have been a luac x64 [if I build it from the source code, unless I specified it to be a 32 bit] it will not work on the mobile devices as they work with 32 bit only, is that right?

Isn't that a bit of a shame, so there have to be 2 implementations, one 32 bit (for the mobile device compilation) and one 64 bit (for the desktop)?

Is there any alternative to distribute libraries written in Lua and still protecting the source code from being in Text Format (apart from Obfuscation, which I have been using on some of my C*SDK offerings)

atilim · February 2012

Hi,

Yes this 32-bit vs. 64-bit incompatibility between Lua bytecodes is also always problematic to me. I think the only way to solve this problem completely is providing 32-bit version of Gideros Studio always. I mean:

$ file Corona\ Simulator 
Corona Simulator: Mach-O executable i386
$ file Gideros\ Player 
Gideros Player: Mach-O 64-bit executable x86_64
$ file luac # which comes with Gideros Studio
luac: Mach-O executable i386

On the other hand, I cannot say anything about whether we can provide the 32-bit version or not in the near future :-S

MikeHart · February 2012

oh now I remembered what I've told you. But yes, 32-bit lua bytecodes won't work on 64-bit Mac OS X. My mistake.

And here go my plans out of the window :-((

Edit: That smily I wanted to add doesn't work right.

atilim · February 2012

On the other hand, we'll face with the same problem when we start to implement desktop applications. Therefore, it's better to build 32-bit Gideros for Mac OS X as soon as possible.

MikeHart · February 2012

So how does it work atm for OSX?

atilim · February 2012

It works directly from the Lua code. Player compiles it to 64-bit lua bytecode just before running it.

OZApps · February 2012

@Atilim, so my original question is that the Libraries have to be distributed in Text format for maximum compatibility or both 32-bit and 64-bit for Mobile and Desktop, right?

atilim · February 2012

@OZApps, yes this is the only way.

SinisterSoft · June 2016

It looks like a patch for Lua 5.1 to make it have universal bytecode should be in the next Gideros release. I've tested it on Windows and it seems to work. Will test on iOS as soon as a test build is ready.

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