3 //! The `rt` module provides a narrow set of runtime services,
4 //! including the global heap (exported in `heap`) and unwinding and
5 //! backtrace support. The APIs in this module are highly unstable,
6 //! and should be considered as private implementation details for the
9 #![unstable(feature = "rt",
10 reason = "this public module should not exist and is highly likely \
16 // Re-export some of our utilities which are expected by other crates.
17 pub use crate::panicking::{begin_panic, begin_panic_fmt, update_panic_count};
19 // To reduce the generated code of the new `lang_start`, this function is doing
22 fn lang_start_internal(main: &(dyn Fn() -> i32 + Sync + crate::panic::RefUnwindSafe),
23 argc: isize, argv: *const *const u8) -> isize {
26 use crate::sys_common;
27 use crate::sys_common::thread_info;
28 use crate::thread::Thread;
33 let main_guard = sys::thread::guard::init();
34 sys::stack_overflow::init();
36 // Next, set up the current Thread with the guard information we just
37 // created. Note that this isn't necessary in general for new threads,
38 // but we just do this to name the main thread and to give it correct
39 // info about the stack bounds.
40 let thread = Thread::new(Some("main".to_owned()));
41 thread_info::set(main_guard, thread);
43 // Store our args if necessary in a squirreled away location
44 sys::args::init(argc, argv);
46 // Let's run some code!
47 #[cfg(feature = "backtrace")]
48 let exit_code = panic::catch_unwind(|| {
49 sys_common::backtrace::__rust_begin_short_backtrace(move || main())
51 #[cfg(not(feature = "backtrace"))]
52 let exit_code = panic::catch_unwind(move || main());
54 sys_common::cleanup();
55 exit_code.unwrap_or(101) as isize
61 fn lang_start<T: crate::process::Termination + 'static>
62 (main: fn() -> T, argc: isize, argv: *const *const u8) -> isize
64 lang_start_internal(&move || main().report(), argc, argv)