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
11 reason = "this public module should not exist and is highly likely \
17 // Re-export some of our utilities which are expected by other crates.
18 pub use crate::panicking::{begin_panic, begin_panic_fmt, update_panic_count};
20 // To reduce the generated code of the new `lang_start`, this function is doing
23 fn lang_start_internal(
24 main: &(dyn Fn() -> i32 + Sync + crate::panic::RefUnwindSafe),
26 argv: *const *const u8,
30 use crate::sys_common;
31 use crate::sys_common::thread_info;
32 use crate::thread::Thread;
37 let main_guard = sys::thread::guard::init();
38 sys::stack_overflow::init();
40 // Next, set up the current Thread with the guard information we just
41 // created. Note that this isn't necessary in general for new threads,
42 // but we just do this to name the main thread and to give it correct
43 // info about the stack bounds.
44 let thread = Thread::new(Some("main".to_owned()));
45 thread_info::set(main_guard, thread);
47 // Store our args if necessary in a squirreled away location
48 sys::args::init(argc, argv);
50 // Let's run some code!
51 let exit_code = panic::catch_unwind(|| {
52 sys_common::backtrace::__rust_begin_short_backtrace(move || main())
55 sys_common::cleanup();
56 exit_code.unwrap_or(101) as isize
62 fn lang_start<T: crate::process::Termination + 'static>(
65 argv: *const *const u8,
67 lang_start_internal(&move || main().report(), argc, argv)