Function jit_insn_mark_offset 

pub unsafe extern "C" fn jit_insn_mark_offset(
    func: jit_function_t,
    offset: jit_int,
) -> c_int

Mark the current position in func as corresponding to the specified bytecode offset. This value will be returned byw]lysw`jit_stack_trace_get_offset, and is useful for associating code positions with source line numbers.