| <!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/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_derive-1.0.133/src/pretend.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>pretend.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" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script> |
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| </pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">proc_macro2::TokenStream</span>; |
| <span class="kw">use</span> <span class="ident">quote::format_ident</span>; |
| |
| <span class="kw">use</span> <span class="ident">internals::ast</span>::{<span class="ident">Container</span>, <span class="ident">Data</span>, <span class="ident">Field</span>, <span class="ident">Style</span>, <span class="ident">Variant</span>}; |
| |
| <span class="comment">// Suppress dead_code warnings that would otherwise appear when using a remote</span> |
| <span class="comment">// derive. Other than this pretend code, a struct annotated with remote derive</span> |
| <span class="comment">// never has its fields referenced and an enum annotated with remote derive</span> |
| <span class="comment">// never has its variants constructed.</span> |
| <span class="comment">//</span> |
| <span class="comment">// warning: field is never used: `i`</span> |
| <span class="comment">// --> src/main.rs:4:20</span> |
| <span class="comment">// |</span> |
| <span class="comment">// 4 | struct StructDef { i: i32 }</span> |
| <span class="comment">// | ^^^^^^</span> |
| <span class="comment">//</span> |
| <span class="comment">// warning: variant is never constructed: `V`</span> |
| <span class="comment">// --> src/main.rs:8:16</span> |
| <span class="comment">// |</span> |
| <span class="comment">// 8 | enum EnumDef { V }</span> |
| <span class="comment">// | ^</span> |
| <span class="comment">//</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pretend_used</span>(<span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, <span class="ident">is_packed</span>: <span class="ident">bool</span>) -> <span class="ident">TokenStream</span> { |
| <span class="kw">let</span> <span class="ident">pretend_fields</span> <span class="op">=</span> <span class="ident">pretend_fields_used</span>(<span class="ident">cont</span>, <span class="ident">is_packed</span>); |
| <span class="kw">let</span> <span class="ident">pretend_variants</span> <span class="op">=</span> <span class="ident">pretend_variants_used</span>(<span class="ident">cont</span>); |
| |
| <span class="macro">quote!</span> { |
| #<span class="ident">pretend_fields</span> |
| #<span class="ident">pretend_variants</span> |
| } |
| } |
| |
| <span class="comment">// For structs with named fields, expands to:</span> |
| <span class="comment">//</span> |
| <span class="comment">// match None::<&T> {</span> |
| <span class="comment">// Some(T { a: __v0, b: __v1 }) => {}</span> |
| <span class="comment">// _ => {}</span> |
| <span class="comment">// }</span> |
| <span class="comment">//</span> |
| <span class="comment">// For packed structs on sufficiently new rustc, expands to:</span> |
| <span class="comment">//</span> |
| <span class="comment">// match None::<&T> {</span> |
| <span class="comment">// Some(__v @ T { a: _, b: _ }) => {</span> |
| <span class="comment">// let _ = addr_of!(__v.a);</span> |
| <span class="comment">// let _ = addr_of!(__v.b);</span> |
| <span class="comment">// }</span> |
| <span class="comment">// _ => {}</span> |
| <span class="comment">// }</span> |
| <span class="comment">//</span> |
| <span class="comment">// For packed structs on older rustc, we assume Sized and !Drop, and expand to:</span> |
| <span class="comment">//</span> |
| <span class="comment">// match None::<T> {</span> |
| <span class="comment">// Some(T { a: __v0, b: __v1 }) => {}</span> |
| <span class="comment">// _ => {}</span> |
| <span class="comment">// }</span> |
| <span class="comment">//</span> |
| <span class="comment">// For enums, expands to the following but only including struct variants:</span> |
| <span class="comment">//</span> |
| <span class="comment">// match None::<&T> {</span> |
| <span class="comment">// Some(T::A { a: __v0 }) => {}</span> |
| <span class="comment">// Some(T::B { b: __v0 }) => {}</span> |
| <span class="comment">// _ => {}</span> |
| <span class="comment">// }</span> |
| <span class="comment">//</span> |
| <span class="kw">fn</span> <span class="ident">pretend_fields_used</span>(<span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, <span class="ident">is_packed</span>: <span class="ident">bool</span>) -> <span class="ident">TokenStream</span> { |
| <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">cont</span>.<span class="ident">data</span> { |
| <span class="ident">Data::Enum</span>(<span class="ident">variants</span>) => <span class="ident">pretend_fields_used_enum</span>(<span class="ident">cont</span>, <span class="ident">variants</span>), |
| <span class="ident">Data::Struct</span>(<span class="ident">Style::Struct</span>, <span class="ident">fields</span>) => { |
| <span class="kw">if</span> <span class="ident">is_packed</span> { |
| <span class="ident">pretend_fields_used_struct_packed</span>(<span class="ident">cont</span>, <span class="ident">fields</span>) |
| } <span class="kw">else</span> { |
| <span class="ident">pretend_fields_used_struct</span>(<span class="ident">cont</span>, <span class="ident">fields</span>) |
| } |
| } |
| <span class="ident">Data::Struct</span>(<span class="kw">_</span>, <span class="kw">_</span>) => <span class="macro">quote!</span>(), |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">pretend_fields_used_struct</span>(<span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, <span class="ident">fields</span>: <span class="kw-2">&</span>[<span class="ident">Field</span>]) -> <span class="ident">TokenStream</span> { |
| <span class="kw">let</span> <span class="ident">type_ident</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">cont</span>.<span class="ident">ident</span>; |
| <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">ty_generics</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">cont</span>.<span class="ident">generics</span>.<span class="ident">split_for_impl</span>(); |
| |
| <span class="kw">let</span> <span class="ident">members</span> <span class="op">=</span> <span class="ident">fields</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">field</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">member</span>); |
| <span class="kw">let</span> <span class="ident">placeholders</span> <span class="op">=</span> (<span class="number">0usize</span>..).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="macro">format_ident!</span>(<span class="string">"__v{}"</span>, <span class="ident">i</span>)); |
| |
| <span class="macro">quote!</span> { |
| <span class="kw">match</span> <span class="ident">_serde::__private::None</span>::<span class="op"><</span><span class="kw-2">&</span>#<span class="ident">type_ident</span> #<span class="ident">ty_generics</span><span class="op">></span> { |
| <span class="ident">_serde::__private::Some</span>(#<span class="ident">type_ident</span> { #(#<span class="ident">members</span>: #<span class="ident">placeholders</span>),<span class="op">*</span> }) => {} |
| <span class="kw">_</span> => {} |
| } |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">pretend_fields_used_struct_packed</span>(<span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, <span class="ident">fields</span>: <span class="kw-2">&</span>[<span class="ident">Field</span>]) -> <span class="ident">TokenStream</span> { |
| <span class="kw">let</span> <span class="ident">type_ident</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">cont</span>.<span class="ident">ident</span>; |
| <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">ty_generics</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">cont</span>.<span class="ident">generics</span>.<span class="ident">split_for_impl</span>(); |
| |
| <span class="kw">let</span> <span class="ident">members</span> <span class="op">=</span> <span class="ident">fields</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">field</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">member</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>(); |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">ptr_addr_of</span>)]</span> |
| { |
| <span class="macro">quote!</span> { |
| <span class="kw">match</span> <span class="ident">_serde::__private::None</span>::<span class="op"><</span><span class="kw-2">&</span>#<span class="ident">type_ident</span> #<span class="ident">ty_generics</span><span class="op">></span> { |
| <span class="ident">_serde::__private::Some</span>(<span class="ident">__v</span> @ #<span class="ident">type_ident</span> { #(#<span class="ident">members</span>: <span class="kw">_</span>),<span class="op">*</span> }) => { |
| #( |
| <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">_serde::__private::ptr::addr_of!</span>(<span class="ident">__v</span>.#<span class="ident">members</span>); |
| )<span class="op">*</span> |
| } |
| <span class="kw">_</span> => {} |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">ptr_addr_of</span>))]</span> |
| { |
| <span class="kw">let</span> <span class="ident">placeholders</span> <span class="op">=</span> (<span class="number">0usize</span>..).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="macro">format_ident!</span>(<span class="string">"__v{}"</span>, <span class="ident">i</span>)); |
| |
| <span class="macro">quote!</span> { |
| <span class="kw">match</span> <span class="ident">_serde::__private::None</span>::<span class="op"><</span>#<span class="ident">type_ident</span> #<span class="ident">ty_generics</span><span class="op">></span> { |
| <span class="ident">_serde::__private::Some</span>(#<span class="ident">type_ident</span> { #(#<span class="ident">members</span>: #<span class="ident">placeholders</span>),<span class="op">*</span> }) => {} |
| <span class="kw">_</span> => {} |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">pretend_fields_used_enum</span>(<span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>, <span class="ident">variants</span>: <span class="kw-2">&</span>[<span class="ident">Variant</span>]) -> <span class="ident">TokenStream</span> { |
| <span class="kw">let</span> <span class="ident">type_ident</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">cont</span>.<span class="ident">ident</span>; |
| <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">ty_generics</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">cont</span>.<span class="ident">generics</span>.<span class="ident">split_for_impl</span>(); |
| |
| <span class="kw">let</span> <span class="ident">patterns</span> <span class="op">=</span> <span class="ident">variants</span> |
| .<span class="ident">iter</span>() |
| .<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">variant</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">variant</span>.<span class="ident">style</span> { |
| <span class="ident">Style::Struct</span> => { |
| <span class="kw">let</span> <span class="ident">variant_ident</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">ident</span>; |
| <span class="kw">let</span> <span class="ident">members</span> <span class="op">=</span> <span class="ident">variant</span>.<span class="ident">fields</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">field</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">member</span>); |
| <span class="kw">let</span> <span class="ident">placeholders</span> <span class="op">=</span> (<span class="number">0usize</span>..).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="macro">format_ident!</span>(<span class="string">"__v{}"</span>, <span class="ident">i</span>)); |
| <span class="prelude-val">Some</span>(<span class="macro">quote!</span>(#<span class="ident">type_ident</span>::#<span class="ident">variant_ident</span> { #(#<span class="ident">members</span>: #<span class="ident">placeholders</span>),<span class="op">*</span> })) |
| } |
| <span class="kw">_</span> => <span class="prelude-val">None</span>, |
| }) |
| .<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>(); |
| |
| <span class="macro">quote!</span> { |
| <span class="kw">match</span> <span class="ident">_serde::__private::None</span>::<span class="op"><</span><span class="kw-2">&</span>#<span class="ident">type_ident</span> #<span class="ident">ty_generics</span><span class="op">></span> { |
| #( |
| <span class="ident">_serde::__private::Some</span>(#<span class="ident">patterns</span>) => {} |
| )<span class="op">*</span> |
| <span class="kw">_</span> => {} |
| } |
| } |
| } |
| |
| <span class="comment">// Expands to one of these per enum variant:</span> |
| <span class="comment">//</span> |
| <span class="comment">// match None {</span> |
| <span class="comment">// Some((__v0, __v1,)) => {</span> |
| <span class="comment">// let _ = E::V { a: __v0, b: __v1 };</span> |
| <span class="comment">// }</span> |
| <span class="comment">// _ => {}</span> |
| <span class="comment">// }</span> |
| <span class="comment">//</span> |
| <span class="kw">fn</span> <span class="ident">pretend_variants_used</span>(<span class="ident">cont</span>: <span class="kw-2">&</span><span class="ident">Container</span>) -> <span class="ident">TokenStream</span> { |
| <span class="kw">let</span> <span class="ident">variants</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">cont</span>.<span class="ident">data</span> { |
| <span class="ident">Data::Enum</span>(<span class="ident">variants</span>) => <span class="ident">variants</span>, |
| <span class="ident">Data::Struct</span>(<span class="kw">_</span>, <span class="kw">_</span>) => { |
| <span class="kw">return</span> <span class="macro">quote!</span>(); |
| } |
| }; |
| |
| <span class="kw">let</span> <span class="ident">type_ident</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">cont</span>.<span class="ident">ident</span>; |
| <span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">ty_generics</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">cont</span>.<span class="ident">generics</span>.<span class="ident">split_for_impl</span>(); |
| <span class="kw">let</span> <span class="ident">turbofish</span> <span class="op">=</span> <span class="ident">ty_generics</span>.<span class="ident">as_turbofish</span>(); |
| |
| <span class="kw">let</span> <span class="ident">cases</span> <span class="op">=</span> <span class="ident">variants</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">variant</span><span class="op">|</span> { |
| <span class="kw">let</span> <span class="ident">variant_ident</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">variant</span>.<span class="ident">ident</span>; |
| <span class="kw">let</span> <span class="ident">placeholders</span> <span class="op">=</span> <span class="kw-2">&</span>(<span class="number">0</span>..<span class="ident">variant</span>.<span class="ident">fields</span>.<span class="ident">len</span>()) |
| .<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="macro">format_ident!</span>(<span class="string">"__v{}"</span>, <span class="ident">i</span>)) |
| .<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>(); |
| |
| <span class="kw">let</span> <span class="ident">pat</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">variant</span>.<span class="ident">style</span> { |
| <span class="ident">Style::Struct</span> => { |
| <span class="kw">let</span> <span class="ident">members</span> <span class="op">=</span> <span class="ident">variant</span>.<span class="ident">fields</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">field</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">member</span>); |
| <span class="macro">quote!</span>({ #(#<span class="ident">members</span>: #<span class="ident">placeholders</span>),<span class="op">*</span> }) |
| } |
| <span class="ident">Style::Tuple</span> <span class="op">|</span> <span class="ident">Style::Newtype</span> => <span class="macro">quote!</span>(( #(#<span class="ident">placeholders</span>),<span class="op">*</span> )), |
| <span class="ident">Style::Unit</span> => <span class="macro">quote!</span>(), |
| }; |
| |
| <span class="macro">quote!</span> { |
| <span class="kw">match</span> <span class="ident">_serde::__private::None</span> { |
| <span class="ident">_serde::__private::Some</span>((#(#<span class="ident">placeholders</span>,)<span class="kw-2">*</span>)) => { |
| <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> #<span class="ident">type_ident</span>::#<span class="ident">variant_ident</span> #<span class="ident">turbofish</span> #<span class="ident">pat</span>; |
| } |
| <span class="kw">_</span> => {} |
| } |
| } |
| }); |
| |
| <span class="macro">quote!</span>(#(#<span class="ident">cases</span>)<span class="kw-2">*</span>) |
| } |
| </code></pre></div> |
| </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde_derive" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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