src/libstd/rt.rs

   1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! Runtime services
  12 //!
  13 //! The `rt` module provides a narrow set of runtime services,
  14 //! including the global heap (exported in `heap`) and unwinding and
  15 //! backtrace support. The APIs in this module are highly unstable,
  16 //! and should be considered as private implementation details for the
  17 //! time being.
  18
  19 #![unstable(feature = "rt",
  20             reason = "this public module should not exist and is highly likely \
  21                       to disappear",
  22             issue = "0")]
  23 #![doc(hidden)]
  24
  25
  26
  27 // Reexport some of our utilities which are expected by other crates.
  28 pub use sys_common::unwind::{begin_unwind, begin_unwind_fmt};
  29
  30 // Rust runtime's startup objects depend on these symbols, so they must be public.
  31 // Since sys_common isn't public, we have to re-export them here.
  32 #[cfg(all(target_os="windows", target_arch = "x86", target_env="gnu"))]
  33 pub use sys_common::unwind::imp::eh_frame_registry::*;
  34
  35 #[cfg(not(test))]
  36 #[lang = "start"]
  37 fn lang_start(main: *const u8, argc: isize, argv: *const *const u8) -> isize {
  38     use borrow::ToOwned;
  39     use mem;
  40     use panic;
  41     use sys;
  42     use sys_common;
  43     use sys_common::thread_info::{self, NewThread};
  44     use thread::Thread;
  45
  46     sys::init();
  47
  48     let failed = unsafe {
  49         let main_guard = sys::thread::guard::init();
  50         sys::stack_overflow::init();
  51
  52         // Next, set up the current Thread with the guard information we just
  53         // created. Note that this isn't necessary in general for new threads,
  54         // but we just do this to name the main thread and to give it correct
  55         // info about the stack bounds.
  56         let thread: Thread = NewThread::new(Some("<main>".to_owned()));
  57         thread_info::set(main_guard, thread);
  58
  59         // Store our args if necessary in a squirreled away location
  60         sys_common::args::init(argc, argv);
  61
  62         // Let's run some code!
  63         let res = panic::catch_unwind(mem::transmute::<_, fn()>(main));
  64         sys_common::cleanup();
  65         res.is_err()
  66     };
  67
  68     if failed {
  69         101
  70     } else {
  71         0
  72     }
  73 }