<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `libstd/alloc.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>alloc.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2017 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">//! Memory allocation APIs</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! In a given program, the standard library has one “global” memory allocator</span>
<span class="doccomment">//! that is used for example by `Box<T>` and `Vec<T>`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Currently the default global allocator is unspecified.</span>
<span class="doccomment">//! The compiler may link to a version of [jemalloc] on some platforms,</span>
<span class="doccomment">//! but this is not guaranteed.</span>
<span class="doccomment">//! Libraries, however, like `cdylib`s and `staticlib`s are guaranteed</span>
<span class="doccomment">//! to use the [`System`] by default.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [jemalloc]: https://github.com/jemalloc/jemalloc</span>
<span class="doccomment">//! [`System`]: struct.System.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # The `#[global_allocator]` attribute</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This attribute allows configuring the choice of global allocator.</span>
<span class="doccomment">//! You can use this to implement a completely custom global allocator</span>
<span class="doccomment">//! to route all default allocation requests to a custom object.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! use std::alloc::{GlobalAlloc, System, Layout};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! struct MyAllocator;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! unsafe impl GlobalAlloc for MyAllocator {</span>
<span class="doccomment">//! unsafe fn alloc(&self, layout: Layout) -> *mut u8 {</span>
<span class="doccomment">//! System.alloc(layout)</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {</span>
<span class="doccomment">//! System.dealloc(ptr, layout)</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! #[global_allocator]</span>
<span class="doccomment">//! static GLOBAL: MyAllocator = MyAllocator;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! // This `Vec` will allocate memory through `GLOBAL` above</span>
<span class="doccomment">//! let mut v = Vec::new();</span>
<span class="doccomment">//! v.push(1);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The attribute is used on a `static` item whose type implements the</span>
<span class="doccomment">//! [`GlobalAlloc`] trait. This type can be provided by an external library:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`GlobalAlloc`]: ../../core/alloc/trait.GlobalAlloc.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust,ignore (demonstrates crates.io usage)</span>
<span class="doccomment">//! extern crate jemallocator;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! use jemallacator::Jemalloc;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! #[global_allocator]</span>
<span class="doccomment">//! static GLOBAL: Jemalloc = Jemalloc;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {}</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `#[global_allocator]` can only be used once in a crate</span>
<span class="doccomment">//! or its recursive dependencies.</span>
<span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc_module"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.28.0"</span>)]</span>
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">core</span>::{<span class="ident">mem</span>, <span class="ident">ptr</span>};
<span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">util</span>::<span class="ident">dumb_print</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc_module"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.28.0"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">alloc</span>::<span class="kw-2">*</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc_system_type"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.28.0"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_system</span>::<span class="ident">System</span>;
<span class="kw">static</span> <span class="ident">HOOK</span>: <span class="ident">AtomicPtr</span><span class="op"><</span>()<span class="op">></span> <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="ident">ptr</span>::<span class="ident">null_mut</span>());
<span class="doccomment">/// Registers a custom allocation error hook, replacing any that was previously registered.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The allocation error hook is invoked when an infallible memory allocation fails, before</span>
<span class="doccomment">/// the runtime aborts. The default hook prints a message to standard error,</span>
<span class="doccomment">/// but this behavior can be customized with the [`set_alloc_error_hook`] and</span>
<span class="doccomment">/// [`take_alloc_error_hook`] functions.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The hook is provided with a `Layout` struct which contains information</span>
<span class="doccomment">/// about the allocation that failed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The allocation error hook is a global resource.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc_error_hook"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"51245"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_alloc_error_hook</span>(<span class="ident">hook</span>: <span class="kw">fn</span>(<span class="ident">Layout</span>)) {
<span class="ident">HOOK</span>.<span class="ident">store</span>(<span class="ident">hook</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> (), <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
}
<span class="doccomment">/// Unregisters the current allocation error hook, returning it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// *See also the function [`set_alloc_error_hook`].*</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If no custom hook is registered, the default hook will be returned.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc_error_hook"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"51245"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take_alloc_error_hook</span>() <span class="op">-></span> <span class="kw">fn</span>(<span class="ident">Layout</span>) {
<span class="kw">let</span> <span class="ident">hook</span> <span class="op">=</span> <span class="ident">HOOK</span>.<span class="ident">swap</span>(<span class="ident">ptr</span>::<span class="ident">null_mut</span>(), <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
<span class="kw">if</span> <span class="ident">hook</span>.<span class="ident">is_null</span>() {
<span class="ident">default_alloc_error_hook</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">hook</span>) }
}
}
<span class="kw">fn</span> <span class="ident">default_alloc_error_hook</span>(<span class="ident">layout</span>: <span class="ident">Layout</span>) {
<span class="ident">dumb_print</span>(<span class="macro">format_args</span><span class="macro">!</span>(<span class="string">"memory allocation of {} bytes failed"</span>, <span class="ident">layout</span>.<span class="ident">size</span>()));
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"oom"</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="ident">rust_oom</span>(<span class="ident">layout</span>: <span class="ident">Layout</span>) <span class="op">-></span> <span class="op">!</span> {
<span class="kw">let</span> <span class="ident">hook</span> <span class="op">=</span> <span class="ident">HOOK</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
<span class="kw">let</span> <span class="ident">hook</span>: <span class="kw">fn</span>(<span class="ident">Layout</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">hook</span>.<span class="ident">is_null</span>() {
<span class="ident">default_alloc_error_hook</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">hook</span>) }
};
<span class="ident">hook</span>(<span class="ident">layout</span>);
<span class="kw">unsafe</span> { ::<span class="ident">sys</span>::<span class="ident">abort_internal</span>(); }
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_attributes</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">__default_lib_allocator</span> {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">System</span>, <span class="ident">Layout</span>, <span class="ident">GlobalAlloc</span>};
<span class="comment">// for symbol names src/librustc/middle/allocator.rs</span>
<span class="comment">// for signatures src/librustc_allocator/lib.rs</span>
<span class="comment">// linkage directives are provided as part of the current compiler allocator</span>
<span class="comment">// ABI</span>
<span class="attribute">#[<span class="ident">no_mangle</span>]</span>
<span class="attribute">#[<span class="ident">rustc_std_internal_symbol</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="ident">__rdl_alloc</span>(<span class="ident">size</span>: <span class="ident">usize</span>, <span class="ident">align</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span> {
<span class="kw">let</span> <span class="ident">layout</span> <span class="op">=</span> <span class="ident">Layout</span>::<span class="ident">from_size_align_unchecked</span>(<span class="ident">size</span>, <span class="ident">align</span>);
<span class="ident">System</span>.<span class="ident">alloc</span>(<span class="ident">layout</span>)
}
<span class="attribute">#[<span class="ident">no_mangle</span>]</span>
<span class="attribute">#[<span class="ident">rustc_std_internal_symbol</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="ident">__rdl_dealloc</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>,
<span class="ident">size</span>: <span class="ident">usize</span>,
<span class="ident">align</span>: <span class="ident">usize</span>) {
<span class="ident">System</span>.<span class="ident">dealloc</span>(<span class="ident">ptr</span>, <span class="ident">Layout</span>::<span class="ident">from_size_align_unchecked</span>(<span class="ident">size</span>, <span class="ident">align</span>))
}
<span class="attribute">#[<span class="ident">no_mangle</span>]</span>
<span class="attribute">#[<span class="ident">rustc_std_internal_symbol</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="ident">__rdl_realloc</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>,
<span class="ident">old_size</span>: <span class="ident">usize</span>,
<span class="ident">align</span>: <span class="ident">usize</span>,
<span class="ident">new_size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span> {
<span class="kw">let</span> <span class="ident">old_layout</span> <span class="op">=</span> <span class="ident">Layout</span>::<span class="ident">from_size_align_unchecked</span>(<span class="ident">old_size</span>, <span class="ident">align</span>);
<span class="ident">System</span>.<span class="ident">realloc</span>(<span class="ident">ptr</span>, <span class="ident">old_layout</span>, <span class="ident">new_size</span>)
}
<span class="attribute">#[<span class="ident">no_mangle</span>]</span>
<span class="attribute">#[<span class="ident">rustc_std_internal_symbol</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="ident">__rdl_alloc_zeroed</span>(<span class="ident">size</span>: <span class="ident">usize</span>, <span class="ident">align</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span> {
<span class="kw">let</span> <span class="ident">layout</span> <span class="op">=</span> <span class="ident">Layout</span>::<span class="ident">from_size_align_unchecked</span>(<span class="ident">size</span>, <span class="ident">align</span>);
<span class="ident">System</span>.<span class="ident">alloc_zeroed</span>(<span class="ident">layout</span>)
}
}
</pre>
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