| <!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/memoffset-0.8.0/src/span_of.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>span_of.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="../../memoffset/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="../../memoffset/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="comment">// Copyright (c) 2017 Gilad Naaman |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in all |
| // copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| // SOFTWARE. |
| |
| </span><span class="doccomment">/// Reexport for `local_inner_macros`; see |
| /// <https://doc.rust-lang.org/edition-guide/rust-2018/macros/macro-changes.html#macros-using-local_inner_macros>. |
| </span><span class="attribute">#[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>_memoffset__compile_error { |
| ($(<span class="macro-nonterminal">$inner</span>:tt)<span class="kw-2">*</span>) => { |
| <span class="macro">compile_error! </span>{ $(<span class="macro-nonterminal">$inner</span>)* } |
| } |
| } |
| |
| <span class="doccomment">/// Produces a range instance representing the sub-slice containing the specified member. |
| /// |
| /// This macro provides 2 forms of differing functionalities. |
| /// |
| /// The first form is identical to the appearance of the `offset_of!` macro. |
| /// |
| /// ```ignore |
| /// span_of!(Struct, member) |
| /// ``` |
| /// |
| /// The second form of `span_of!` returns a sub-slice which starts at one field, and ends at another. |
| /// The general pattern of this form is: |
| /// |
| /// ```ignore |
| /// // Exclusive |
| /// span_of!(Struct, member_a .. member_b) |
| /// // Inclusive |
| /// span_of!(Struct, member_a ..= member_b) |
| /// |
| /// // Open-ended ranges |
| /// span_of!(Struct, .. end) |
| /// span_of!(Struct, start ..) |
| /// ``` |
| /// |
| /// ### Note |
| /// This macro uses recursion in order to resolve the range expressions, so there is a limit to |
| /// the complexity of the expression. |
| /// In order to raise the limit, the compiler's recursion limit should be lifted. |
| /// |
| /// ### Safety |
| /// The inter-field form mentioned above assumes that the first field is positioned before the |
| /// second. |
| /// This is only guarenteed for `repr(C)` structs. |
| /// Usage with `repr(Rust)` structs may yield unexpected results, like downward-going ranges, |
| /// spans that include unexpected fields, empty spans, or spans that include *unexpected* padding bytes. |
| /// |
| /// ## Examples |
| /// ``` |
| /// use memoffset::span_of; |
| /// |
| /// #[repr(C)] |
| /// struct Florp { |
| /// a: u32 |
| /// } |
| /// |
| /// #[repr(C)] |
| /// struct Blarg { |
| /// x: [u32; 2], |
| /// y: [u8; 56], |
| /// z: Florp, |
| /// egg: [[u8; 4]; 4] |
| /// } |
| /// |
| /// fn main() { |
| /// assert_eq!(0..84, span_of!(Blarg, ..)); |
| /// assert_eq!(0..8, span_of!(Blarg, .. y)); |
| /// assert_eq!(0..64, span_of!(Blarg, ..= y)); |
| /// assert_eq!(0..8, span_of!(Blarg, x)); |
| /// assert_eq!(8..84, span_of!(Blarg, y ..)); |
| /// assert_eq!(0..8, span_of!(Blarg, x .. y)); |
| /// assert_eq!(0..64, span_of!(Blarg, x ..= y)); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>span_of { |
| (@helper <span class="macro-nonterminal">$root</span>:ident, [] ..=) => { |
| <span class="macro">_memoffset__compile_error!</span>(<span class="string">"Expected a range, found '..='"</span>) |
| }; |
| (@helper <span class="macro-nonterminal">$root</span>:ident, [] ..) => { |
| <span class="macro">_memoffset__compile_error!</span>(<span class="string">"Expected a range, found '..'"</span>) |
| }; |
| <span class="comment">// No explicit begin for range. |
| </span>(@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, [] ..) => {{ |
| (<span class="macro-nonterminal">$root </span><span class="kw">as </span>usize, |
| <span class="macro-nonterminal">$root </span><span class="kw">as </span>usize + <span class="macro-nonterminal">$crate::__priv::size_of_pointee</span>(<span class="macro-nonterminal">$root</span>)) |
| }}; |
| (@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, [] ..= <span class="macro-nonterminal">$end</span>:tt) => {{ |
| <span class="kw">let </span>end = <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, <span class="macro-nonterminal">$end</span>); |
| (<span class="macro-nonterminal">$root </span><span class="kw">as </span>usize, end <span class="kw">as </span>usize + <span class="macro-nonterminal">$crate::__priv::size_of_pointee</span>(end)) |
| }}; |
| (@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, [] .. <span class="macro-nonterminal">$end</span>:tt) => {{ |
| (<span class="macro-nonterminal">$root </span><span class="kw">as </span>usize, <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, <span class="macro-nonterminal">$end</span>) <span class="kw">as </span>usize) |
| }}; |
| <span class="comment">// Explicit begin and end for range. |
| </span>(@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, # <span class="macro-nonterminal">$begin</span>:tt [] ..= <span class="macro-nonterminal">$end</span>:tt) => {{ |
| <span class="kw">let </span>begin = <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, <span class="macro-nonterminal">$begin</span>); |
| <span class="kw">let </span>end = <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, <span class="macro-nonterminal">$end</span>); |
| (begin <span class="kw">as </span>usize, end <span class="kw">as </span>usize + <span class="macro-nonterminal">$crate::__priv::size_of_pointee</span>(end)) |
| }}; |
| (@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, # <span class="macro-nonterminal">$begin</span>:tt [] .. <span class="macro-nonterminal">$end</span>:tt) => {{ |
| (<span class="macro">raw_field!</span>(<span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, <span class="macro-nonterminal">$begin</span>) <span class="kw">as </span>usize, |
| <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, <span class="macro-nonterminal">$end</span>) <span class="kw">as </span>usize) |
| }}; |
| <span class="comment">// No explicit end for range. |
| </span>(@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, # <span class="macro-nonterminal">$begin</span>:tt [] ..) => {{ |
| (<span class="macro">raw_field!</span>(<span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, <span class="macro-nonterminal">$begin</span>) <span class="kw">as </span>usize, |
| <span class="macro-nonterminal">$root </span><span class="kw">as </span>usize + <span class="macro-nonterminal">$crate::__priv::size_of_pointee</span>(<span class="macro-nonterminal">$root</span>)) |
| }}; |
| (@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, # <span class="macro-nonterminal">$begin</span>:tt [] ..=) => {{ |
| <span class="macro">_memoffset__compile_error!</span>( |
| <span class="string">"Found inclusive range to the end of a struct. Did you mean '..' instead of '..='?"</span>) |
| }}; |
| <span class="comment">// Just one field. |
| </span>(@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, # <span class="macro-nonterminal">$field</span>:tt []) => {{ |
| <span class="kw">let </span>field = <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, <span class="macro-nonterminal">$field</span>); |
| (field <span class="kw">as </span>usize, field <span class="kw">as </span>usize + <span class="macro-nonterminal">$crate::__priv::size_of_pointee</span>(field)) |
| }}; |
| <span class="comment">// Parsing. |
| </span>(@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, $(# <span class="macro-nonterminal">$begin</span>:tt)+ [] <span class="macro-nonterminal">$tt</span>:tt $(<span class="macro-nonterminal">$rest</span>:tt)<span class="kw-2">*</span>) => {{ |
| <span class="macro">span_of!</span>(@helper <span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, $(#<span class="macro-nonterminal">$begin</span>)* #<span class="macro-nonterminal">$tt </span>[] $(<span class="macro-nonterminal">$rest</span>)<span class="kw-2">*</span>) |
| }}; |
| (@helper <span class="macro-nonterminal">$root</span>:ident, <span class="macro-nonterminal">$parent</span>:path, [] <span class="macro-nonterminal">$tt</span>:tt $(<span class="macro-nonterminal">$rest</span>:tt)<span class="kw-2">*</span>) => {{ |
| <span class="macro">span_of!</span>(@helper <span class="macro-nonterminal">$root</span>, <span class="macro-nonterminal">$parent</span>, #<span class="macro-nonterminal">$tt </span>[] $(<span class="macro-nonterminal">$rest</span>)<span class="kw-2">*</span>) |
| }}; |
| |
| <span class="comment">// Entry point. |
| </span>(<span class="macro-nonterminal">$sty</span>:path, $(<span class="macro-nonterminal">$exp</span>:tt)+) => ({ |
| <span class="comment">// Get a base pointer. |
| </span><span class="macro">_memoffset__let_base_ptr!</span>(root, <span class="macro-nonterminal">$sty</span>); |
| <span class="kw">let </span>base = root <span class="kw">as </span>usize; |
| <span class="kw">let </span>(begin, end) = <span class="macro">span_of!</span>(@helper root, <span class="macro-nonterminal">$sty</span>, [] $(<span class="macro-nonterminal">$exp</span>)<span class="kw-2">*</span>); |
| begin-base..end-base |
| }); |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span>core::mem; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>span_simple() { |
| <span class="attribute">#[repr(C)] |
| </span><span class="kw">struct </span>Foo { |
| a: u32, |
| b: [u8; <span class="number">2</span>], |
| c: i64, |
| } |
| |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Foo, a), <span class="number">0</span>..<span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Foo, b), <span class="number">4</span>..<span class="number">6</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Foo, c), <span class="number">8</span>..<span class="number">8 </span>+ <span class="number">8</span>); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(miri, ignore)] </span><span class="comment">// this creates unaligned references |
| </span><span class="kw">fn </span>span_simple_packed() { |
| <span class="attribute">#[repr(C, packed)] |
| </span><span class="kw">struct </span>Foo { |
| a: u32, |
| b: [u8; <span class="number">2</span>], |
| c: i64, |
| } |
| |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Foo, a), <span class="number">0</span>..<span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Foo, b), <span class="number">4</span>..<span class="number">6</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Foo, c), <span class="number">6</span>..<span class="number">6 </span>+ <span class="number">8</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>span_forms() { |
| <span class="attribute">#[repr(C)] |
| </span><span class="kw">struct </span>Florp { |
| a: u32, |
| } |
| |
| <span class="attribute">#[repr(C)] |
| </span><span class="kw">struct </span>Blarg { |
| x: u64, |
| y: [u8; <span class="number">56</span>], |
| z: Florp, |
| egg: [[u8; <span class="number">4</span>]; <span class="number">5</span>], |
| } |
| |
| <span class="comment">// Love me some brute force |
| </span><span class="macro">assert_eq!</span>(<span class="number">0</span>..<span class="number">8</span>, <span class="macro">span_of!</span>(Blarg, x)); |
| <span class="macro">assert_eq!</span>(<span class="number">64</span>..<span class="number">68</span>, <span class="macro">span_of!</span>(Blarg, z)); |
| <span class="macro">assert_eq!</span>(<span class="number">68</span>..mem::size_of::<Blarg>(), <span class="macro">span_of!</span>(Blarg, egg)); |
| |
| <span class="macro">assert_eq!</span>(<span class="number">8</span>..<span class="number">64</span>, <span class="macro">span_of!</span>(Blarg, y..z)); |
| <span class="macro">assert_eq!</span>(<span class="number">0</span>..<span class="number">64</span>, <span class="macro">span_of!</span>(Blarg, x..=y)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>ig_test() { |
| <span class="attribute">#[repr(C)] |
| </span><span class="kw">struct </span>Member { |
| foo: u32, |
| } |
| |
| <span class="attribute">#[repr(C)] |
| </span><span class="kw">struct </span>Test { |
| x: u64, |
| y: [u8; <span class="number">56</span>], |
| z: Member, |
| egg: [[u8; <span class="number">4</span>]; <span class="number">4</span>], |
| } |
| |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..x), <span class="number">0</span>..<span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..=x), <span class="number">0</span>..<span class="number">8</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..y), <span class="number">0</span>..<span class="number">8</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..=y), <span class="number">0</span>..<span class="number">64</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..z), <span class="number">0</span>..<span class="number">64</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..=z), <span class="number">0</span>..<span class="number">68</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..egg), <span class="number">0</span>..<span class="number">68</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..=egg), <span class="number">0</span>..<span class="number">84</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(Test, ..), <span class="number">0</span>..mem::size_of::<Test>()); |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">span_of!</span>(Test, x..), |
| <span class="macro">offset_of!</span>(Test, x)..mem::size_of::<Test>() |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">span_of!</span>(Test, y..), |
| <span class="macro">offset_of!</span>(Test, y)..mem::size_of::<Test>() |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">span_of!</span>(Test, z..), |
| <span class="macro">offset_of!</span>(Test, z)..mem::size_of::<Test>() |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">span_of!</span>(Test, egg..), |
| <span class="macro">offset_of!</span>(Test, egg)..mem::size_of::<Test>() |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">span_of!</span>(Test, x..y), |
| <span class="macro">offset_of!</span>(Test, x)..<span class="macro">offset_of!</span>(Test, y) |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">span_of!</span>(Test, x..=y), |
| <span class="macro">offset_of!</span>(Test, x)..<span class="macro">offset_of!</span>(Test, y) + mem::size_of::<[u8; <span class="number">56</span>]>() |
| ); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="memoffset" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
