katlogic / ljx Goto Github PK

local function bug()
    local var=9
    local a=setmetatable({},{
        __index=function(t,i)
            return setmetatable({},{
                __len=function() return var end
            })
        end
    })
    print(var, #a.a)
end
bug()

What's expected is 9, 9 But instead you get out 9, table: 0xADDRESS
The table itself appears to be _ENV

Is it planned?

I understand that fully supporting 64-bit integers in LJX is probably a major undertaking, but I guess a lot of people would like to have integers and bitwise operators in a JIT compiler for Lua.

Sometimes experiencing weird oddities such as this:

in 5.1, 5.2, 5.3, luajit: local i=1 while i do print(i) break end -> 1
in ljx: local i=1 while i do print(i) break end -> nil

But it works fine in any other kind of block like for loops, repeat until, do-end, etc.

Why do while loops specifically seem to break?

The original LJ project has LuaJIT VM + Lua 5.1 parser. Just add a Lua 5.2 parser to it and a Lua 5.2 environment which can be used with require"5.2". Then add command line flags: -5.1, -5.2, etc. The Lua 5.2 environment would have a load function that can compile Lua 5.2 source code into LuaJIT bytecode, for example.

LuaJIT also supports 64-bit integer literals thru "xxxLL", so you can just use that.

All you really need is to add on to the stdlib.