debug.setstack

C closures are not supported

This function will throw an error if the stack level points to a C closure, such as setstack(0, 1, 0).

debug.setstack replaces a value in a specified stack frame.

This allows for powerful manipulation of runtime variables or arguments, particularly useful in advanced debugging or dynamic patching scenarios.

function debug.setstack(level: number, index: number, value: any): ()

Parameters

Parameter	Description
level	The stack level to target. 1 refers to the current function.
index	The index/slot in the stack frame to replace.
value	The new value to assign at that stack slot.

---

Examples

Example 1

error(debug.setstack(1, 1, function()
    return function()
        print("Replaced")
    end
end))() -- Output: Replaced

Example 2

local outer_value = 10

local function inner_function()
    outer_value += 9
    debug.setstack(2, 1, 100)
end

inner_function()
print(outer_value) -- Output: 100