6ac7fc73f5
This includes updating the language items and marking what needs to
change after a snapshot.
If you do not use the standard library, the language items you need to
implement have changed. For example:
```rust
#[lang = "fail_fmt"] fn fail_fmt() -> ! { loop {} }
```
is now
```rust
#[lang = "panic_fmt"] fn panic_fmt() -> ! { loop {} }
```
Related, lesser-implemented language items `fail` and
`fail_bounds_check` have become `panic` and `panic_bounds_check`, as
well. These are implemented by `libcore`, so it is unlikely (though
possible!) that these two renamings will affect you.
[breaking-change]
Fix test suite
117 lines
3.8 KiB
Rust
117 lines
3.8 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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//! Panic support for libcore
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//!
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//! The core library cannot define panicking, but it does *declare* panicking. This
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//! means that the functions inside of libcore are allowed to panic, but to be
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//! useful an upstream crate must define panicking for libcore to use. The current
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//! interface for panicking is:
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//!
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//! ```ignore
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//! fn panic_impl(fmt: &fmt::Arguments, &(&'static str, uint)) -> !;
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//! ```
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//!
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//! This definition allows for panicking with any general message, but it does not
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//! allow for failing with a `Box<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 panicking functions, but these are just the
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//! necessary lang items for the compiler. All panics are 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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use intrinsics;
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// NOTE(stage0): remove after a snapshot
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#[cfg(stage0)]
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#[cold] #[inline(never)] // this is the slow path, always
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#[lang="fail"]
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pub fn panic(expr_file_line: &(&'static str, &'static str, uint)) -> ! {
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let (expr, file, line) = *expr_file_line;
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let ref file_line = (file, line);
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format_args!(|args| -> () {
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panic_fmt(args, file_line);
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}, "{}", expr);
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unsafe { intrinsics::abort() }
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}
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// NOTE(stage0): remove after a snapshot
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#[cfg(stage0)]
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#[cold] #[inline(never)]
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#[lang="fail_bounds_check"]
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fn panic_bounds_check(file_line: &(&'static str, uint),
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index: uint, len: uint) -> ! {
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format_args!(|args| -> () {
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panic_fmt(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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// NOTE(stage0): remove after a snapshot
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#[cfg(stage0)]
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#[cold] #[inline(never)]
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pub fn panic_fmt(fmt: &fmt::Arguments, file_line: &(&'static str, uint)) -> ! {
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#[allow(ctypes)]
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extern {
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#[lang = "fail_fmt"]
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fn panic_impl(fmt: &fmt::Arguments, file: &'static str,
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line: uint) -> !;
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}
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let (file, line) = *file_line;
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unsafe { panic_impl(fmt, file, line) }
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}
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// NOTE(stage0): remove cfg after a snapshot
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#[cfg(not(stage0))]
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#[cold] #[inline(never)] // this is the slow path, always
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#[lang="panic"]
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pub fn panic(expr_file_line: &(&'static str, &'static str, uint)) -> ! {
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let (expr, file, line) = *expr_file_line;
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let ref file_line = (file, line);
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format_args!(|args| -> () {
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panic_fmt(args, file_line);
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}, "{}", expr);
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unsafe { intrinsics::abort() }
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}
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// NOTE(stage0): remove cfg after a snapshot
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#[cfg(not(stage0))]
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#[cold] #[inline(never)]
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#[lang="panic_bounds_check"]
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fn panic_bounds_check(file_line: &(&'static str, uint),
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index: uint, len: uint) -> ! {
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format_args!(|args| -> () {
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panic_fmt(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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// NOTE(stage0): remove cfg after a snapshot
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#[cfg(not(stage0))]
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#[cold] #[inline(never)]
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pub fn panic_fmt(fmt: &fmt::Arguments, file_line: &(&'static str, uint)) -> ! {
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#[allow(ctypes)]
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extern {
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#[lang = "panic_fmt"]
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fn panic_impl(fmt: &fmt::Arguments, file: &'static str,
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line: uint) -> !;
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}
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let (file, line) = *file_line;
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unsafe { panic_impl(fmt, file, line) }
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}
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