<!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 `/home/tan/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.139/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="../../static.files/SourceSerif4-Regular-1f7d512b176f0f72.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Bold-124a1ca42af929b6.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-6827029ac823cab7.css" id="mainThemeStyle"><link rel="stylesheet" id="themeStyle" href="../../static.files/light-ebce58d0a40c3431.css"><link rel="stylesheet" disabled href="../../static.files/dark-f23faae4a2daf9a6.css"><link rel="stylesheet" disabled href="../../static.files/ayu-8af5e100b21cd173.css"><script id="default-settings" ></script><script src="../../static.files/storage-d43fa987303ecbbb.js"></script><script defer src="../../static.files/source-script-5cf2e01a42cc9858.js"></script><script defer src="../../source-files.js"></script><script defer src="../../static.files/main-c55e1eb52e1886b4.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-13285aec31fa243e.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.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"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../libc/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" 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="../../static.files/wheel-5ec35bf9ca753509.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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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="attr">#[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="attr">#[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="attr">#[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="attr">#[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="attr">#[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="attr">#[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="attr">#[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="attr">#[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="attr">#[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="attr">#[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>
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