Function UpValueIndex

lua.go:1385–1385

UpValueIndex returns the pseudo-index that represents the i-th upvalue of the running function. http://www.lua.org/manual/5.2/manual.html#lua_upvalueindex

(i int)

//
// http://www.lua.org/manual/5.2/manual.html#lua_upvalueindex
func UpValueIndex(i int) int   { return RegistryIndex - i }
func isPseudoIndex(i int) bool { return i <= RegistryIndex }

func apiCheckStackSpace(l *State, n int) { l.assert(n < l.top-l.callInfo.function) }