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<!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 `src/libstd/sys_common/alloc.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>alloc.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../light1.35.0.css" id="themeStyle"><script src="../../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow1.35.0.svg");}</style></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">&#9776;</div><a href='../../../std/index.html'><img src='../../../rust-logo1.35.0.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel1.35.0.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><div class="example-wrap"><pre class="rust ">
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>

<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">alloc</span>::{<span class="ident">GlobalAlloc</span>, <span class="ident">Layout</span>, <span class="ident">System</span>};
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">cmp</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">ptr</span>;

<span class="comment">// The minimum alignment guaranteed by the architecture. This value is used to</span>
<span class="comment">// add fast paths for low alignment values.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;arm&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;mips&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;powerpc&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;powerpc64&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;asmjs&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)))]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MIN_ALIGN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">8</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86_64&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;aarch64&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;mips64&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;s390x&quot;</span>,
              <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;sparc64&quot;</span>)))]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MIN_ALIGN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">16</span>;

<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">realloc_fallback</span>(
    <span class="ident">alloc</span>: <span class="kw-2">&amp;</span><span class="ident">System</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_layout</span>: <span class="ident">Layout</span>,
    <span class="ident">new_size</span>: <span class="ident">usize</span>,
) <span class="op">-&gt;</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span> {
    <span class="comment">// Docs for GlobalAlloc::realloc require this to be valid:</span>
    <span class="kw">let</span> <span class="ident">new_layout</span> <span class="op">=</span> <span class="ident">Layout</span>::<span class="ident">from_size_align_unchecked</span>(<span class="ident">new_size</span>, <span class="ident">old_layout</span>.<span class="ident">align</span>());

    <span class="kw">let</span> <span class="ident">new_ptr</span> <span class="op">=</span> <span class="ident">GlobalAlloc</span>::<span class="ident">alloc</span>(<span class="ident">alloc</span>, <span class="ident">new_layout</span>);
    <span class="kw">if</span> <span class="op">!</span><span class="ident">new_ptr</span>.<span class="ident">is_null</span>() {
        <span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">old_layout</span>.<span class="ident">size</span>(), <span class="ident">new_size</span>);
        <span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">ptr</span>, <span class="ident">new_ptr</span>, <span class="ident">size</span>);
        <span class="ident">GlobalAlloc</span>::<span class="ident">dealloc</span>(<span class="ident">alloc</span>, <span class="ident">ptr</span>, <span class="ident">old_layout</span>);
    }
    <span class="ident">new_ptr</span>
}
</pre></div>
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