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<!doctype html><html lang=en><head><meta name=generator content="Hugo 0.102.1"><title>nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="nilstriebs blog"><meta property="og:description" content><meta property="og:url" content="/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23</span> <!doctype html><html lang=en><head><meta name=generator content="Hugo 0.111.3"><title>nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="nilstriebs blog"><meta property="og:description" content><meta property="og:url" content="/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23</span>
<span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp; <span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>About better aliasing semantics for <code>Box&lt;T></code></div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2022 Powered by <a href=http://gohugo.io>Hugo</a></span> #<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>About better aliasing semantics for <code>Box&lt;T></code></div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2023 Powered by <a href=http://gohugo.io>Hugo</a></span>
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@ -44,7 +44,7 @@ reveals the solution: (severely shortened to only show the relevant parts)</p><p
</code></pre><p>See the little attribute on the first parameter called <code>noalias</code>? That&rsquo;s what&rsquo;s doing the magic here. </code></pre><p>See the little attribute on the first parameter called <code>noalias</code>? That&rsquo;s what&rsquo;s doing the magic here.
<code>noalias</code> is an LLVM attribute on pointers that allows for various optimizations. If there are two pointers, <code>noalias</code> is an LLVM attribute on pointers that allows for various optimizations. If there are two pointers,
and at least one of them is <code>noalias</code>, there are some restrictions around the two. Approximately:</p><ul><li>If one of them writes, they must not point to the same value (alias each other)</li><li>If neither of them writes, they can alias just fine. and at least one of them is <code>noalias</code>, there are some restrictions around the two. Approximately:</p><ul><li>If one of them writes, they must not point to the same value (alias each other)</li><li>If neither of them writes, they can alias just fine.
Therefore, we also apply <code>noalias</code> to <code>&mut T</code> and <code>&T</code> (if it doesn&rsquo;t contain interior mutability through Therefore, we also apply <code>noalias</code> to <code>&amp;mut T</code> and <code>&amp;T</code> (if it doesn&rsquo;t contain interior mutability through
<code>UnsafeCell&lt;T></code>), since they uphold these rules.</li></ul><p>For more info on <code>noalias</code>, see <a href=https://llvm.org/docs/LangRef.html#parameter-attributes>LLVMs LangRef</a>.</p><p>This might sound familiar to you if you&rsquo;re a viewer of <a href=https://twitter.com/jonhoo>Jon Gjengset</a>&rsquo;s content (which I can highly recommend). Jon has made an entire video about this before since his crate <code>left-right</code> <code>UnsafeCell&lt;T></code>), since they uphold these rules.</li></ul><p>For more info on <code>noalias</code>, see <a href=https://llvm.org/docs/LangRef.html#parameter-attributes>LLVMs LangRef</a>.</p><p>This might sound familiar to you if you&rsquo;re a viewer of <a href=https://twitter.com/jonhoo>Jon Gjengset</a>&rsquo;s content (which I can highly recommend). Jon has made an entire video about this before since his crate <code>left-right</code>
was affected by this (<a href=https://youtu.be/EY7Wi9fV5bk)>https://youtu.be/EY7Wi9fV5bk)</a>.</p><p>If you&rsquo;re looking for <em>any</em> hint that using box emits <code>noalias</code>, you have to look no further than the documentation was affected by this (<a href=https://youtu.be/EY7Wi9fV5bk)>https://youtu.be/EY7Wi9fV5bk)</a>.</p><p>If you&rsquo;re looking for <em>any</em> hint that using box emits <code>noalias</code>, you have to look no further than the documentation
for <a href=https://doc.rust-lang.org/nightly/std/boxed/index.html#considerations-for-unsafe-code><code>std::boxed</code></a>. Well, the nightly or beta docs, because I only added this section very recently. For years, this behaviour was not really documented, and you had to for <a href=https://doc.rust-lang.org/nightly/std/boxed/index.html#considerations-for-unsafe-code><code>std::boxed</code></a>. Well, the nightly or beta docs, because I only added this section very recently. For years, this behaviour was not really documented, and you had to
@ -96,7 +96,7 @@ If box didn&rsquo;t invalidate pointers on move and instead behaved like a norma
the heap, and therefore moving it should invalidate pointers, since moving <code>T</code> definitely has to invalidate pointers to it, the heap, and therefore moving it should invalidate pointers, since moving <code>T</code> definitely has to invalidate pointers to it,
this comparison doesn&rsquo;t make sense to me. While <code>Box&lt;T></code> usually behaves like a <code>T</code>, it&rsquo;s just a pointer. Writers of unsafe this comparison doesn&rsquo;t make sense to me. While <code>Box&lt;T></code> usually behaves like a <code>T</code>, it&rsquo;s just a pointer. Writers of unsafe
code <em>know</em> that box is just a pointer and will abuse that knowledge, accidentally causing UB with it. While this can be code <em>know</em> that box is just a pointer and will abuse that knowledge, accidentally causing UB with it. While this can be
mitigated with better docs and teaching, like how no one questions the uniqueness of <code>&mut T</code> (maybe that&rsquo;s also because that mitigated with better docs and teaching, like how no one questions the uniqueness of <code>&amp;mut T</code> (maybe that&rsquo;s also because that
one makes intuitive sense, &ldquo;shared xor mutable&rdquo; is a simple concept), I think it will always be a problem, one makes intuitive sense, &ldquo;shared xor mutable&rdquo; is a simple concept), I think it will always be a problem,
because in my opinion, box being unique and invalidating pointers on move is simply not intuitive.</p><p>When a box is moved, the pointer bytes change their location in memory. But the bytes the box points to stay the same. They don&rsquo;t because in my opinion, box being unique and invalidating pointers on move is simply not intuitive.</p><p>When a box is moved, the pointer bytes change their location in memory. But the bytes the box points to stay the same. They don&rsquo;t
move in memory. This is the fundamental missing intuition about the box behaviour.</p><p>There are also other reasons why the box behaviour is not desirable. Even people who know about the behaviour of box will want move in memory. This is the fundamental missing intuition about the box behaviour.</p><p>There are also other reasons why the box behaviour is not desirable. Even people who know about the behaviour of box will want
@ -114,10 +114,10 @@ provide an aliasable version of <code>Box&lt;T></code>, which is used by the sel
So if box stayed unique, people could also just pick up that crate as a dependency and use the aliasable box from there instead of So if box stayed unique, people could also just pick up that crate as a dependency and use the aliasable box from there instead of
having to write their own. Interestingly, this crate also provides a <code>Vec&lt;T></code>, even though <code>Vec&lt;T></code> can currently be aliased in practice and having to write their own. Interestingly, this crate also provides a <code>Vec&lt;T></code>, even though <code>Vec&lt;T></code> can currently be aliased in practice and
in the current version of stacked borrows just fine, although it&rsquo;s also not clear whether we want to keep it like this, but I in the current version of stacked borrows just fine, although it&rsquo;s also not clear whether we want to keep it like this, but I
don&rsquo;t think this can reasonable be changed.</p><blockquote><p>One thing was just pointed out to me after releasing the post: Mutation usually goes through <code>&mut T</code> anyways, even when the value don&rsquo;t think this can reasonable be changed.</p><blockquote><p>One thing was just pointed out to me after releasing the post: Mutation usually goes through <code>&amp;mut T</code> anyways, even when the value
is stored as a <code>Box&lt;T></code>. Therefore, all the guarantees of uniqueness are already present when mutating boxes, making the uniqueness is stored as a <code>Box&lt;T></code>. Therefore, all the guarantees of uniqueness are already present when mutating boxes, making the uniqueness
of box even less important.</p></blockquote><h1 id=noalias-noslow>noalias, noslow<a href=#noalias-noslow class=hanchor arialabel=Anchor>&#8983;</a></h1><p>There is one clear potential benefit from this box behaviour: ✨Optimizations✨. <code>noalias</code> doesn&rsquo;t exist for fun, it&rsquo;s something of box even less important.</p></blockquote><h1 id=noalias-noslow>noalias, noslow<a href=#noalias-noslow class=hanchor arialabel=Anchor>&#8983;</a></h1><p>There is one clear potential benefit from this box behaviour: ✨Optimizations✨. <code>noalias</code> doesn&rsquo;t exist for fun, it&rsquo;s something
that can bring clear performance wins (for <code>noalias</code> on <code>&mut T</code>, those were measureable). So the only question remains: that can bring clear performance wins (for <code>noalias</code> on <code>&amp;mut T</code>, those were measureable). So the only question remains:
<strong>How much performance does <code>noalias</code> on <code>Box&lt;T></code> give us now, and how many potential performance improvements could we get in the <strong>How much performance does <code>noalias</code> on <code>Box&lt;T></code> give us now, and how many potential performance improvements could we get in the
future?</strong> For the latter, there is no simple answer. For the former, there is. <code>rustc</code> has <a href=https://github.com/rust-lang/rust/pull/99527><em>no</em> performance improvements</a> future?</strong> For the latter, there is no simple answer. For the former, there is. <code>rustc</code> has <a href=https://github.com/rust-lang/rust/pull/99527><em>no</em> performance improvements</a>
from being compiled with <code>noalias</code> on <code>Box&lt;T></code>, but this isn&rsquo;t really representative since rustc mostly uses arenas instead of box internally.</p><p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the <a href=https://gist.github.com/Nilstrieb/9a0751fb9fd1044a30ab55cef9a7d335>results</a> from being compiled with <code>noalias</code> on <code>Box&lt;T></code>, but this isn&rsquo;t really representative since rustc mostly uses arenas instead of box internally.</p><p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the <a href=https://gist.github.com/Nilstrieb/9a0751fb9fd1044a30ab55cef9a7d335>results</a>
@ -131,6 +131,6 @@ are very strong, and still giving code an option to obtain these seems useful. O
<code>&'static mut T</code> that is unleaked for drop, but the semantics of this are still <a href=https://github.com/rust-lang/unsafe-code-guidelines/issues/316>unclear</a>. <code>&'static mut T</code> that is unleaked for drop, but the semantics of this are still <a href=https://github.com/rust-lang/unsafe-code-guidelines/issues/316>unclear</a>.
If that is not possible, exposing <code>std::ptr::Unique</code> (with it getting boxes aliasing semantics) could be desirable. For this, all existing usages of <code>Unique</code> If that is not possible, exposing <code>std::ptr::Unique</code> (with it getting boxes aliasing semantics) could be desirable. For this, all existing usages of <code>Unique</code>
inside the standard library would have to be removed. We could also offer a <code>std::boxed::UniqueBox</code> that keeps the current semantics, but this would also bring direct aliasing inside the standard library would have to be removed. We could also offer a <code>std::boxed::UniqueBox</code> that keeps the current semantics, but this would also bring direct aliasing
decisions more towards safe code, which I am not a huge fan of. Ownership is enough already.</p><p>I guess what I am wishing for are some good and flexible raw pointer types. But that&rsquo;s still in the stars&mldr;</p><p>For more information about this topic, see <a href=https://github.com/rust-lang/unsafe-code-guidelines/issues/326>https://github.com/rust-lang/unsafe-code-guidelines/issues/326</a></p><p><em>Thanks to the nice people on the Rust Community Discord for their feedback on the draft of this post!</em></p></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2022 Powered by <a href=http://gohugo.io>Hugo</a></span> decisions more towards safe code, which I am not a huge fan of. Ownership is enough already.</p><p>I guess what I am wishing for are some good and flexible raw pointer types. But that&rsquo;s still in the stars&mldr;</p><p>For more information about this topic, see <a href=https://github.com/rust-lang/unsafe-code-guidelines/issues/326>https://github.com/rust-lang/unsafe-code-guidelines/issues/326</a></p><p><em>Thanks to the nice people on the Rust Community Discord for their feedback on the draft of this post!</em></p></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2023 Powered by <a href=http://gohugo.io>Hugo</a></span>
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<!doctype html><html lang=en><head><title>Posts :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/posts/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Posts"><meta property="og:description" content><meta property="og:url" content="/posts/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/posts/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23</span> <!doctype html><html lang=en><head><title>Posts :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/posts/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Posts"><meta property="og:description" content><meta property="og:url" content="/posts/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/posts/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-23</span>
<span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp; <span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>About better aliasing semantics for <code>Box&lt;T></code></div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2022 Powered by <a href=http://gohugo.io>Hugo</a></span> #<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>About better aliasing semantics for <code>Box&lt;T></code></div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2023 Powered by <a href=http://gohugo.io>Hugo</a></span>
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<span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp; <span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
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