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Tobias Käs wrote:
Is it safe to leave objects on the stack for faster access, using absolute stack indices? I consider this to avoid getting the same tables from the registry, each time a C function needs it (I have several of this kind).

If you mean after calling lua_open(), to push some values on the stack before running your script so that you can access them in your C-function, then the answer is no you can't do that. Inside any C-function called from a Lua script, stack index 1 is the first argument passed to the function.

You could make you C-function a C-closure that keeps your table as an upvalue. See lua_pushcclosure and lua_upvalueindex.

- Peter Shook