| // Copyright 2013 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| //! Runtime services |
| //! |
| //! The `rt` module provides a narrow set of runtime services, |
| //! including the global heap (exported in `heap`) and unwinding and |
| //! backtrace support. The APIs in this module are highly unstable, |
| //! and should be considered as private implementation details for the |
| //! time being. |
| |
| #![unstable(feature = "rt", |
| reason = "this public module should not exist and is highly likely \ |
| to disappear", |
| issue = "0")] |
| #![doc(hidden)] |
| |
| |
| // Re-export some of our utilities which are expected by other crates. |
| pub use panicking::{begin_panic, begin_panic_fmt, update_panic_count}; |
| |
| // To reduce the generated code of the new `lang_start`, this function is doing |
| // the real work. |
| #[cfg(not(test))] |
| fn lang_start_internal(main: &(dyn Fn() -> i32 + Sync + ::panic::RefUnwindSafe), |
| argc: isize, argv: *const *const u8) -> isize { |
| use panic; |
| use sys; |
| use sys_common; |
| use sys_common::thread_info; |
| use thread::Thread; |
| |
| sys::init(); |
| |
| unsafe { |
| let main_guard = sys::thread::guard::init(); |
| sys::stack_overflow::init(); |
| |
| // Next, set up the current Thread with the guard information we just |
| // created. Note that this isn't necessary in general for new threads, |
| // but we just do this to name the main thread and to give it correct |
| // info about the stack bounds. |
| let thread = Thread::new(Some("main".to_owned())); |
| thread_info::set(main_guard, thread); |
| |
| // Store our args if necessary in a squirreled away location |
| sys::args::init(argc, argv); |
| |
| // Let's run some code! |
| #[cfg(feature = "backtrace")] |
| let exit_code = panic::catch_unwind(|| { |
| ::sys_common::backtrace::__rust_begin_short_backtrace(move || main()) |
| }); |
| #[cfg(not(feature = "backtrace"))] |
| let exit_code = panic::catch_unwind(move || main()); |
| |
| sys_common::cleanup(); |
| exit_code.unwrap_or(101) as isize |
| } |
| } |
| |
| #[cfg(not(test))] |
| #[lang = "start"] |
| fn lang_start<T: ::process::Termination + 'static> |
| (main: fn() -> T, argc: isize, argv: *const *const u8) -> isize |
| { |
| lang_start_internal(&move || main().report(), argc, argv) |
| } |
| |
| /// Function used for reverting changes to the main stack before setrlimit(). |
| /// This is POSIX (non-Linux) specific and unlikely to be directly stabilized. |
| #[unstable(feature = "rustc_stack_internals", issue = "0")] |
| pub unsafe fn deinit_stack_guard() { |
| ::sys::thread::guard::deinit(); |
| } |
| |
| /// Function used for resetting the main stack guard address after setrlimit(). |
| /// This is POSIX specific and unlikely to be directly stabilized. |
| #[unstable(feature = "rustc_stack_internals", issue = "0")] |
| pub unsafe fn update_stack_guard() { |
| let main_guard = ::sys::thread::guard::init(); |
| ::sys_common::thread_info::reset_guard(main_guard); |
| } |