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</pre><pre class="rust ">
<span class="comment">// Copyright 2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! Panic support for libcore</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The core library cannot define panicking, but it does *declare* panicking. This</span>
<span class="doccomment">//! means that the functions inside of libcore are allowed to panic, but to be</span>
<span class="doccomment">//! useful an upstream crate must define panicking for libcore to use. The current</span>
<span class="doccomment">//! interface for panicking is:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! # use std::fmt;</span>
<span class="doccomment">//! fn panic_impl(fmt: fmt::Arguments, file_line_col: &(&'static str, u32, u32)) -> !</span>
<span class="doccomment">//! # { loop {} }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This definition allows for panicking with any general message, but it does not</span>
<span class="doccomment">//! allow for failing with a `Box<Any>` value. The reason for this is that libcore</span>
<span class="doccomment">//! is not allowed to allocate.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This module contains a few other panicking functions, but these are just the</span>
<span class="doccomment">//! necessary lang items for the compiler. All panics are funneled through this</span>
<span class="doccomment">//! one function. Currently, the actual symbol is declared in the standard</span>
<span class="doccomment">//! library, but the location of this may change over time.</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">dead_code</span>, <span class="ident">missing_docs</span>)]</span>
<span class="attribute">#![<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_panic"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal details of the implementation of the `panic!` \
and related macros"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="attribute">#[<span class="ident">cold</span>]</span> <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span> <span class="comment">// this is the slow path, always</span>
<span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"panic"</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">panic</span>(<span class="ident">expr_file_line_col</span>: <span class="kw-2">&</span>(<span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">u32</span>, <span class="ident">u32</span>)) <span class="op">-></span> <span class="op">!</span> {
<span class="comment">// Use Arguments::new_v1 instead of format_args!("{}", expr) to potentially</span>
<span class="comment">// reduce size overhead. The format_args! macro uses str's Display trait to</span>
<span class="comment">// write expr, which calls Formatter::pad, which must accommodate string</span>
<span class="comment">// truncation and padding (even though none is used here). Using</span>
<span class="comment">// Arguments::new_v1 may allow the compiler to omit Formatter::pad from the</span>
<span class="comment">// output binary, saving up to a few kilobytes.</span>
<span class="kw">let</span> (<span class="ident">expr</span>, <span class="ident">file</span>, <span class="ident">line</span>, <span class="ident">col</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">expr_file_line_col</span>;
<span class="ident">panic_fmt</span>(<span class="ident">fmt</span>::<span class="ident">Arguments</span>::<span class="ident">new_v1</span>(<span class="kw-2">&</span>[<span class="ident">expr</span>], <span class="kw-2">&</span>[]), <span class="kw-2">&</span>(<span class="ident">file</span>, <span class="ident">line</span>, <span class="ident">col</span>))
}
<span class="attribute">#[<span class="ident">cold</span>]</span> <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"panic_bounds_check"</span>]</span>
<span class="kw">fn</span> <span class="ident">panic_bounds_check</span>(<span class="ident">file_line_col</span>: <span class="kw-2">&</span>(<span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">u32</span>, <span class="ident">u32</span>),
<span class="ident">index</span>: <span class="ident">usize</span>, <span class="ident">len</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="op">!</span> {
<span class="ident">panic_fmt</span>(<span class="macro">format_args</span><span class="macro">!</span>(<span class="string">"index out of bounds: the len is {} but the index is {}"</span>,
<span class="ident">len</span>, <span class="ident">index</span>), <span class="ident">file_line_col</span>)
}
<span class="attribute">#[<span class="ident">cold</span>]</span> <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">panic_fmt</span>(<span class="ident">fmt</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>, <span class="ident">file_line_col</span>: <span class="kw-2">&</span>(<span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">u32</span>, <span class="ident">u32</span>)) <span class="op">-></span> <span class="op">!</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">improper_ctypes</span>)]</span>
<span class="kw">extern</span> {
<span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"panic_fmt"</span>]</span>
<span class="attribute">#[<span class="ident">unwind</span>]</span>
<span class="kw">fn</span> <span class="ident">panic_impl</span>(<span class="ident">fmt</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>, <span class="ident">file</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">line</span>: <span class="ident">u32</span>, <span class="ident">col</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="op">!</span>;
}
<span class="kw">let</span> (<span class="ident">file</span>, <span class="ident">line</span>, <span class="ident">col</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">file_line_col</span>;
<span class="kw">unsafe</span> { <span class="ident">panic_impl</span>(<span class="ident">fmt</span>, <span class="ident">file</span>, <span class="ident">line</span>, <span class="ident">col</span>) }
}
</pre>
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