On Nov 30, 2017 6:17 PM, "Soni "They/Them" L." <fakedme@gmail.com
<mailto:fakedme@gmail.com>> wrote:
Hi!
I have some code that looks like this:
debug.setmetatable("", {__index=function(o,k)
local mt = metatables[coroutine.running()].string
if mt then
local __index = rawget(mt, "__index")
if type(__index) == "function" then
return __index(o,k)
else
return __index[k]
end
end
error()
end})
It takes the metatables for the basic Lua types (string, number,
nil, etc) and replaces them with a proxy metatable. This proxy
metatable forwards to a different table based on the currently
running coroutine. This gives me virtualization of those metatables.
It's really slow (3-4x slower[1] than the default string
metatable) and I'd like to make it faster. Is that possible?
[1] - I haven't actually benchmarked it, but default string
metatable gives about 2 table accesses per operation; this thing
does at least 8 when using globals, and that doesn't take into
account interpreter overhead and all the function calls!
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