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Alex Crichton
19260b043b
The collapse/unindent passes were run in the wrong order, generating different markdown for indented tests.
68 lines
2.3 KiB
Rust
68 lines
2.3 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Failure support for libcore
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//!
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//! The core library cannot define failure, but it does *declare* failure. This
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//! means that the functions inside of libcore are allowed to fail, but to be
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//! useful an upstream crate must define failure for libcore to use. The current
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//! interface for failure is:
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//!
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//! ```ignore
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//! fn begin_unwind(fmt: &fmt::Arguments, file: &str, line: uint) -> !;
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//! ```
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//!
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//! This definition allows for failing with any general message, but it does not
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//! allow for failing with a `~Any` value. The reason for this is that libcore
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//! is not allowed to allocate.
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//!
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//! This module contains a few other failure functions, but these are just the
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//! necessary lang items for the compiler. All failure is funneled through this
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//! one function. Currently, the actual symbol is declared in the standard
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//! library, but the location of this may change over time.
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#![allow(dead_code, missing_doc)]
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use fmt;
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#[cfg(not(test))] use intrinsics;
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#[cold] #[inline(never)] // this is the slow path, always
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#[lang="fail_"]
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#[cfg(not(test))]
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fn fail_(expr: &'static str, file: &'static str, line: uint) -> ! {
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format_args!(|args| -> () {
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begin_unwind(args, file, line);
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}, "{}", expr);
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unsafe { intrinsics::abort() }
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}
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#[cold]
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#[lang="fail_bounds_check"]
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#[cfg(not(test))]
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fn fail_bounds_check(file: &'static str, line: uint,
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index: uint, len: uint) -> ! {
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format_args!(|args| -> () {
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begin_unwind(args, file, line);
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}, "index out of bounds: the len is {} but the index is {}", len, index);
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unsafe { intrinsics::abort() }
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}
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#[cold]
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pub fn begin_unwind(fmt: &fmt::Arguments, file: &'static str, line: uint) -> ! {
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#[allow(ctypes)]
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extern {
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#[lang = "begin_unwind"]
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fn begin_unwind(fmt: &fmt::Arguments, file: &'static str,
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line: uint) -> !;
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}
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unsafe { begin_unwind(fmt, file, line) }
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}
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