[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] passing struct by value does not respect x86_64 SysV ABI (#443)

[balazskosi]

I've heard that Lua's FFI is wonderful. Maybe we should take a look how did they tackle this problem. 

After some quick digging around, here is the code setting up the arguments:
https://github.com/LuaJIT/LuaJIT/blob/v2.1/src/lj_ccall.c#L917

Here are the x64 specific defines used by the setting up code:
https://github.com/LuaJIT/LuaJIT/blob/v2.1/src/lj_ccall.c#L132

They definitely have all the type information. They get it from parsing the C declarations.

Here is an example of the declaration part:
https://github.com/luapower/chipmunk/blob/master/chipmunk_h.lua
And the usage:
https://github.com/luapower/chipmunk/blob/master/chipmunk_demo.lua

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