| #![crate_name="externcallback"] |
| #![crate_type = "lib"] |
| #![feature(rustc_private)] |
| |
| extern crate libc; |
| |
| pub mod rustrt { |
| extern crate libc; |
| |
| #[link(name = "rust_test_helpers", kind = "static")] |
| extern { |
| pub fn rust_dbg_call(cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t, |
| data: libc::uintptr_t) |
| -> libc::uintptr_t; |
| } |
| } |
| |
| pub fn fact(n: libc::uintptr_t) -> libc::uintptr_t { |
| unsafe { |
| println!("n = {}", n); |
| rustrt::rust_dbg_call(cb, n) |
| } |
| } |
| |
| pub extern fn cb(data: libc::uintptr_t) -> libc::uintptr_t { |
| if data == 1 { |
| data |
| } else { |
| fact(data - 1) * data |
| } |
| } |