| <!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/pin-project-internal-1.1.0/src/pinned_drop.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>pinned_drop.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="../../pin_project_internal/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="../../pin_project_internal/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="kw">use </span>proc_macro2::TokenStream; |
| <span class="kw">use </span>quote::{format_ident, quote, ToTokens}; |
| <span class="kw">use </span>syn::{ |
| parse_quote, spanned::Spanned, token::Colon, visit_mut::VisitMut, Error, FnArg, |
| GenericArgument, Ident, ImplItem, ItemImpl, Pat, PatIdent, PatType, Path, PathArguments, |
| <span class="prelude-ty">Result</span>, ReturnType, Signature, Token, Type, TypePath, TypeReference, |
| }; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::utils::{ReplaceReceiver, SliceExt}; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>attribute(args: <span class="kw-2">&</span>TokenStream, <span class="kw-2">mut </span>input: ItemImpl) -> TokenStream { |
| <span class="kw">let </span>res = (|| -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">if </span>!args.is_empty() { |
| <span class="macro">bail!</span>(args, <span class="string">"unexpected argument: `{}`"</span>, args) |
| } |
| validate_impl(<span class="kw-2">&</span>input)<span class="question-mark">?</span>; |
| expand_impl(<span class="kw-2">&mut </span>input); |
| <span class="prelude-val">Ok</span>(()) |
| })(); |
| |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = res { |
| <span class="kw">let </span><span class="kw-2">mut </span>tokens = e.to_compile_error(); |
| <span class="kw">if let </span>Type::Path(self_ty) = <span class="kw-2">&*</span>input.self_ty { |
| <span class="kw">let </span>(impl_generics, <span class="kw">_</span>, where_clause) = input.generics.split_for_impl(); |
| |
| <span class="comment">// Generate a dummy impl of `PinnedDrop`. |
| // In many cases, `#[pinned_drop] impl` is declared after `#[pin_project]`. |
| // Therefore, if `pinned_drop` compile fails, you will also get an error |
| // about `PinnedDrop` not being implemented. |
| // This can be prevented to some extent by generating a dummy |
| // `PinnedDrop` implementation. |
| // We already know that we will get a compile error, so this won't |
| // accidentally compile successfully. |
| // |
| // However, if `input.self_ty` is not Type::Path, there is a high possibility that |
| // the type does not exist (since #[pin_project] can only be used on struct/enum |
| // definitions), so do not generate a dummy impl. |
| </span>tokens.extend(<span class="macro">quote! </span>{ |
| <span class="kw">impl </span>#impl_generics ::pin_project::__private::PinnedDrop <span class="kw">for </span>#self_ty |
| #where_clause |
| { |
| <span class="kw">unsafe fn </span>drop(<span class="self">self</span>: ::pin_project::__private::Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>) {} |
| } |
| }); |
| } |
| tokens |
| } <span class="kw">else </span>{ |
| input.into_token_stream() |
| } |
| } |
| |
| <span class="doccomment">/// Validates the signature of given `PinnedDrop` impl. |
| </span><span class="kw">fn </span>validate_impl(item: <span class="kw-2">&</span>ItemImpl) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">const </span>INVALID_ITEM: <span class="kw-2">&</span>str = |
| <span class="string">"#[pinned_drop] may only be used on implementation for the `PinnedDrop` trait"</span>; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(attr) = item.attrs.find(<span class="string">"pinned_drop"</span>) { |
| <span class="macro">bail!</span>(attr, <span class="string">"duplicate #[pinned_drop] attribute"</span>); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, path, <span class="kw">_</span>)) = <span class="kw-2">&</span>item.trait_ { |
| <span class="kw">if </span>!path.is_ident(<span class="string">"PinnedDrop"</span>) { |
| <span class="macro">bail!</span>(path, INVALID_ITEM); |
| } |
| } <span class="kw">else </span>{ |
| <span class="macro">bail!</span>(item.self_ty, INVALID_ITEM); |
| } |
| |
| <span class="kw">if </span>item.unsafety.is_some() { |
| <span class="macro">bail!</span>(item.unsafety, <span class="string">"implementing the trait `PinnedDrop` is not unsafe"</span>); |
| } |
| <span class="kw">if </span>item.items.is_empty() { |
| <span class="macro">bail!</span>(item, <span class="string">"not all trait items implemented, missing: `drop`"</span>); |
| } |
| |
| <span class="kw">match </span><span class="kw-2">&*</span>item.self_ty { |
| Type::Path(<span class="kw">_</span>) => {} |
| ty => { |
| <span class="macro">bail!</span>(ty, <span class="string">"implementing the trait `PinnedDrop` on this type is unsupported"</span>); |
| } |
| } |
| |
| item.items.iter().enumerate().try_for_each(|(i, item)| <span class="kw">match </span>item { |
| ImplItem::Const(item) => { |
| <span class="macro">bail!</span>(item, <span class="string">"const `{}` is not a member of trait `PinnedDrop`"</span>, item.ident) |
| } |
| ImplItem::Type(item) => { |
| <span class="macro">bail!</span>(item, <span class="string">"type `{}` is not a member of trait `PinnedDrop`"</span>, item.ident) |
| } |
| ImplItem::Fn(method) => { |
| validate_sig(<span class="kw-2">&</span>method.sig)<span class="question-mark">?</span>; |
| <span class="kw">if </span>i == <span class="number">0 </span>{ |
| <span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="macro">bail!</span>(method, <span class="string">"duplicate definitions with name `drop`"</span>) |
| } |
| } |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(<span class="string">"unexpected ImplItem"</span>), |
| }) |
| } |
| |
| <span class="doccomment">/// Validates the signature of given `PinnedDrop::drop` method. |
| /// |
| /// The correct signature is: `(mut) self: (<path>::)Pin<&mut Self>` |
| </span><span class="kw">fn </span>validate_sig(sig: <span class="kw-2">&</span>Signature) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">fn </span>get_ty_path(ty: <span class="kw-2">&</span>Type) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Path> { |
| <span class="kw">if let </span>Type::Path(TypePath { qself: <span class="prelude-val">None</span>, path }) = ty { |
| <span class="prelude-val">Some</span>(path) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">const </span>INVALID_ARGUMENT: <span class="kw-2">&</span>str = <span class="string">"method `drop` must take an argument `self: Pin<&mut Self>`"</span>; |
| |
| <span class="kw">if </span>sig.ident != <span class="string">"drop" </span>{ |
| <span class="macro">bail!</span>(sig.ident, <span class="string">"method `{}` is not a member of trait `PinnedDrop"</span>, sig.ident,); |
| } |
| |
| <span class="kw">if let </span>ReturnType::Type(<span class="kw">_</span>, ty) = <span class="kw-2">&</span>sig.output { |
| <span class="kw">match </span><span class="kw-2">&**</span>ty { |
| Type::Tuple(ty) <span class="kw">if </span>ty.elems.is_empty() => {} |
| <span class="kw">_ </span>=> <span class="macro">bail!</span>(ty, <span class="string">"method `drop` must return the unit type"</span>), |
| } |
| } |
| |
| <span class="kw">match </span>sig.inputs.len() { |
| <span class="number">1 </span>=> {} |
| <span class="number">0 </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new(sig.paren_token.span.join(), INVALID_ARGUMENT)), |
| <span class="kw">_ </span>=> <span class="macro">bail!</span>(sig.inputs, INVALID_ARGUMENT), |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(arg) = sig.receiver() { |
| <span class="comment">// (mut) self: <path> |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = get_ty_path(<span class="kw-2">&</span>arg.ty) { |
| <span class="kw">let </span>ty = |
| path.segments.last().expect(<span class="string">"Type paths should always have at least one segment"</span>); |
| <span class="kw">if let </span>PathArguments::AngleBracketed(args) = <span class="kw-2">&</span>ty.arguments { |
| <span class="comment">// (mut) self: (<path>::)<ty><&mut <elem>..> |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(GenericArgument::Type(Type::Reference(TypeReference { |
| mutability: <span class="prelude-val">Some</span>(<span class="kw">_</span>), |
| elem, |
| .. |
| }))) = args.args.first() |
| { |
| <span class="comment">// (mut) self: (<path>::)Pin<&mut Self> |
| </span><span class="kw">if </span>args.args.len() == <span class="number">1 |
| </span>&& ty.ident == <span class="string">"Pin" |
| </span>&& get_ty_path(elem).map_or(<span class="bool-val">false</span>, |path| path.is_ident(<span class="string">"Self"</span>)) |
| { |
| <span class="kw">if </span>sig.unsafety.is_some() { |
| <span class="macro">bail!</span>(sig.unsafety, <span class="string">"implementing the method `drop` is not unsafe"</span>); |
| } |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="macro">bail!</span>(sig.inputs[<span class="number">0</span>], INVALID_ARGUMENT) |
| } |
| |
| <span class="comment">// from: |
| // |
| // fn drop(self: Pin<&mut Self>) { |
| // // ... |
| // } |
| // |
| // into: |
| // |
| // unsafe fn drop(self: Pin<&mut Self>) { |
| // fn __drop_inner<T>(__self: Pin<&mut Foo<'_, T>>) { |
| // fn __drop_inner() {} |
| // // ... |
| // } |
| // __drop_inner(self); |
| // } |
| // |
| </span><span class="kw">fn </span>expand_impl(item: <span class="kw-2">&mut </span>ItemImpl) { |
| <span class="comment">// `PinnedDrop` is a private trait and should not appear in docs. |
| </span>item.attrs.push(<span class="macro">parse_quote!</span>(<span class="attribute">#[doc(hidden)]</span>)); |
| |
| <span class="kw">let </span>path = <span class="kw-2">&mut </span>item.trait_.as_mut().expect(<span class="string">"unexpected inherent impl"</span>).<span class="number">1</span>; |
| <span class="kw-2">*</span>path = <span class="macro">parse_quote_spanned! </span>{ path.span() => |
| ::pin_project::__private::PinnedDrop |
| }; |
| |
| <span class="kw">let </span>method = |
| <span class="kw">if let </span>ImplItem::Fn(method) = <span class="kw-2">&mut </span>item.items[<span class="number">0</span>] { method } <span class="kw">else </span>{ <span class="macro">unreachable!</span>() }; |
| |
| <span class="comment">// `fn drop(mut self: Pin<&mut Self>)` -> `fn __drop_inner<T>(mut __self: Pin<&mut Receiver>)` |
| </span><span class="kw">let </span>drop_inner = { |
| <span class="kw">let </span><span class="kw-2">mut </span>drop_inner = method.clone(); |
| <span class="kw">let </span>ident = <span class="macro">format_ident!</span>(<span class="string">"__drop_inner"</span>); |
| <span class="comment">// Add a dummy `__drop_inner` function to prevent users call outer `__drop_inner`. |
| </span>drop_inner.block.stmts.insert(<span class="number">0</span>, <span class="macro">parse_quote!</span>(<span class="kw">fn </span>#ident() {})); |
| drop_inner.sig.ident = ident; |
| drop_inner.sig.generics = item.generics.clone(); |
| <span class="kw">let </span>receiver = drop_inner.sig.receiver().expect(<span class="string">"drop() should have a receiver"</span>).clone(); |
| <span class="kw">let </span>pat = Box::new(Pat::Ident(PatIdent { |
| attrs: Vec::new(), |
| by_ref: <span class="prelude-val">None</span>, |
| mutability: receiver.mutability, |
| ident: Ident::new(<span class="string">"__self"</span>, receiver.self_token.span()), |
| subpat: <span class="prelude-val">None</span>, |
| })); |
| drop_inner.sig.inputs[<span class="number">0</span>] = FnArg::Typed(PatType { |
| attrs: receiver.attrs, |
| pat, |
| colon_token: Colon::default(), |
| ty: receiver.ty, |
| }); |
| <span class="kw">let </span>self_ty = <span class="kw">if let </span>Type::Path(ty) = <span class="kw-2">&*</span>item.self_ty { ty } <span class="kw">else </span>{ <span class="macro">unreachable!</span>() }; |
| <span class="kw">let </span><span class="kw-2">mut </span>visitor = ReplaceReceiver(self_ty); |
| visitor.visit_signature_mut(<span class="kw-2">&mut </span>drop_inner.sig); |
| visitor.visit_block_mut(<span class="kw-2">&mut </span>drop_inner.block); |
| drop_inner |
| }; |
| |
| <span class="comment">// `fn drop(mut self: Pin<&mut Self>)` -> `unsafe fn drop(self: Pin<&mut Self>)` |
| </span>method.sig.unsafety = <span class="prelude-val">Some</span>(<<span class="macro">Token!</span>[<span class="kw">unsafe</span>]>::default()); |
| <span class="kw">let </span>self_token = <span class="kw">if let </span>FnArg::Receiver(<span class="kw-2">ref mut </span>rec) = method.sig.inputs[<span class="number">0</span>] { |
| rec.mutability = <span class="prelude-val">None</span>; |
| <span class="kw-2">&</span>rec.self_token |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"drop() should have a receiver"</span>) |
| }; |
| |
| method.block.stmts = <span class="macro">parse_quote! </span>{ |
| <span class="attribute">#[allow(clippy::needless_pass_by_value)] </span><span class="comment">// This lint does not warn the receiver. |
| </span>#drop_inner |
| __drop_inner(#self_token); |
| }; |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="pin_project_internal" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
