| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.145/src/fixed_width_ints.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fixed_width_ints.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../libc/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../libc/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! This module contains type aliases for C's fixed-width integer types . |
| //! |
| //! These aliases are deprecated: use the Rust types instead. |
| |
| </span><span class="attribute">#[deprecated(since = <span class="string">"0.2.55"</span>, note = <span class="string">"Use i8 instead."</span>)] |
| </span><span class="kw">pub type </span>int8_t = i8; |
| <span class="attribute">#[deprecated(since = <span class="string">"0.2.55"</span>, note = <span class="string">"Use i16 instead."</span>)] |
| </span><span class="kw">pub type </span>int16_t = i16; |
| <span class="attribute">#[deprecated(since = <span class="string">"0.2.55"</span>, note = <span class="string">"Use i32 instead."</span>)] |
| </span><span class="kw">pub type </span>int32_t = i32; |
| <span class="attribute">#[deprecated(since = <span class="string">"0.2.55"</span>, note = <span class="string">"Use i64 instead."</span>)] |
| </span><span class="kw">pub type </span>int64_t = i64; |
| <span class="attribute">#[deprecated(since = <span class="string">"0.2.55"</span>, note = <span class="string">"Use u8 instead."</span>)] |
| </span><span class="kw">pub type </span>uint8_t = u8; |
| <span class="attribute">#[deprecated(since = <span class="string">"0.2.55"</span>, note = <span class="string">"Use u16 instead."</span>)] |
| </span><span class="kw">pub type </span>uint16_t = u16; |
| <span class="attribute">#[deprecated(since = <span class="string">"0.2.55"</span>, note = <span class="string">"Use u32 instead."</span>)] |
| </span><span class="kw">pub type </span>uint32_t = u32; |
| <span class="attribute">#[deprecated(since = <span class="string">"0.2.55"</span>, note = <span class="string">"Use u64 instead."</span>)] |
| </span><span class="kw">pub type </span>uint64_t = u64; |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(all(libc_int128, target_arch = <span class="string">"aarch64"</span>, not(target_os = <span class="string">"windows"</span>)))] </span>{ |
| <span class="comment">// This introduces partial support for FFI with __int128 and |
| // equivalent types on platforms where Rust's definition is validated |
| // to match the standard C ABI of that platform. |
| // |
| // Rust does not guarantee u128/i128 are sound for FFI, and its |
| // definitions are in fact known to be incompatible. [0] |
| // |
| // However these problems aren't fundamental, and are just platform |
| // inconsistencies. Specifically at the time of this writing: |
| // |
| // * For x64 SysV ABIs (everything but Windows), the types are underaligned. |
| // * For all Windows ABIs, Microsoft doesn't actually officially define __int128, |
| // and as a result different implementations don't actually agree on its ABI. |
| // |
| // But on the other major aarch64 platforms (android, linux, ios, macos) we have |
| // validated that rustc has the right ABI for these types. This is important because |
| // aarch64 uses these types in some fundamental OS types like user_fpsimd_struct, |
| // which represents saved simd registers. |
| // |
| // Any API which uses these types will need to `#[ignore(improper_ctypes)]` |
| // until the upstream rust issue is resolved, but this at least lets us make |
| // progress on platforms where this type is important. |
| // |
| // The list of supported architectures and OSes is intentionally very restricted, |
| // as careful work needs to be done to verify that a particular platform |
| // has a conformant ABI. |
| // |
| // [0]: https://github.com/rust-lang/rust/issues/54341 |
| |
| </span><span class="doccomment">/// C `__int128` (a GCC extension that's part of many ABIs) |
| </span><span class="kw">pub type </span>__int128 = i128; |
| <span class="doccomment">/// C `unsigned __int128` (a GCC extension that's part of many ABIs) |
| </span><span class="kw">pub type </span>__uint128 = u128; |
| <span class="doccomment">/// C __int128_t (alternate name for [__int128][]) |
| </span><span class="kw">pub type </span>__int128_t = i128; |
| <span class="doccomment">/// C __uint128_t (alternate name for [__uint128][]) |
| </span><span class="kw">pub type </span>__uint128_t = u128; |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(libc_underscore_const_names)] </span>{ |
| <span class="macro">macro_rules! </span>static_assert_eq { |
| (<span class="macro-nonterminal">$a</span>:expr, <span class="macro-nonterminal">$b</span>:expr) => { |
| <span class="kw">const _</span>: [(); <span class="macro-nonterminal">$a</span>] = [(); <span class="macro-nonterminal">$b</span>]; |
| }; |
| } |
| |
| <span class="comment">// NOTE: if you add more platforms to here, you may need to cfg |
| // these consts. They should always match the platform's values |
| // for `sizeof(__int128)` and `_Alignof(__int128)`. |
| </span><span class="kw">const </span>_SIZE_128: usize = <span class="number">16</span>; |
| <span class="kw">const </span>_ALIGN_128: usize = <span class="number">16</span>; |
| |
| <span class="comment">// Since Rust doesn't officially guarantee that these types |
| // have compatible ABIs, we const assert that these values have the |
| // known size/align of the target platform's libc. If rustc ever |
| // tries to regress things, it will cause a compilation error. |
| // |
| // This isn't a bullet-proof solution because e.g. it doesn't |
| // catch the fact that llvm and gcc disagree on how x64 __int128 |
| // is actually *passed* on the stack (clang underaligns it for |
| // the same reason that rustc *never* properly aligns it). |
| </span><span class="macro">static_assert_eq!</span>(core::mem::size_of::<__int128>(), _SIZE_128); |
| <span class="macro">static_assert_eq!</span>(core::mem::align_of::<__int128>(), _ALIGN_128); |
| |
| <span class="macro">static_assert_eq!</span>(core::mem::size_of::<__uint128>(), _SIZE_128); |
| <span class="macro">static_assert_eq!</span>(core::mem::align_of::<__uint128>(), _ALIGN_128); |
| |
| <span class="macro">static_assert_eq!</span>(core::mem::size_of::<__int128_t>(), _SIZE_128); |
| <span class="macro">static_assert_eq!</span>(core::mem::align_of::<__int128_t>(), _ALIGN_128); |
| |
| <span class="macro">static_assert_eq!</span>(core::mem::size_of::<__uint128_t>(), _SIZE_128); |
| <span class="macro">static_assert_eq!</span>(core::mem::align_of::<__uint128_t>(), _ALIGN_128); |
| } |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="libc" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
