On: PH7 – An Embedded Implementation of PHP (C Library)

[justincormack]

LuaJIT can output bytecode as .o files that you can just link. It is not very well documented but its pretty easy once you get the hang of it.

[Touche → justincormack]

.o files are not executable. You still have to link it to something that executes, and that something isn't Lua.

[oscargrouch → Touche]

.o files are executable code.. they are just not a native file executable (elf, coff, mach-o) = headers + .o files

[justincormack → Touche]

yeah, you link to lua.a or lua.so and a very small stub to run the code. There is an example here https://github.com/justincormack/ljsyscall/blob/master/examp...

[ygra → Touche]

Couldn't you tell the linker to use one of the functions in the .o as entry point?

[oscargrouch → ygra]

yes..

1 - create the object files (with luajit?)

2 - create a main() in c.. use "extern" to reference the external symbol in the .o files and call it from main.

The symbols in the object files produced by luajit or whatever need to be exported/ visible.. (are they mangled?)

3 - create a object file for main.c

4 - link the .o created from luajit(or whatever, dart?) and main.o together

If the linker cant find the external symbol it wont link to a binary (so you need to know how, in what names they are exported.. use objdump to lookup for symbols)

[Touche → ygra]

Code example?

edit: If so I've been doing it wrong for years.

[stephan10h → Touche]

This guy is doing it: http://williamaadams.wordpress.com/2013/03/13/is-that-cool-o...

[ygra → Touche]

ld has a -e argument [−4] (and MSVC's link has /ENTRY [37]). Otherwise, if there is a function with the expected name, calling convention and arguments in the object file I doubt the linker will complain.

[−4] ftp://ftp.gnu.org/old-gnu/Manuals/ld-2.9.1/html_node/ld_24.html

[37] http://msdn.microsoft.com/library/f9t8842e.aspx