Auto merge of #80041 - jyn514:shrink-item, r=GuillaumeGomez

Get rid of `clean::Deprecation`

This brings the size of `item.deprecation` from 56 to 16 bytes. Helps with #79103 and #76382, in the same vein as #79957.

r? `@GuillaumeGomez`

compiler/rustc_attr/src/builtin.rs

@@ -621,7 +621,7 @@ pub fn eval_condition(
     }
 }
 
-#[derive(Encodable, Decodable, Clone, HashStable_Generic)]
+#[derive(Debug, Encodable, Decodable, Clone, HashStable_Generic)]
 pub struct Deprecation {
     pub since: Option<Symbol>,
     /// The note to issue a reason.

src/librustdoc/clean/mod.rs

@@ -2337,16 +2337,6 @@ impl Clean<Item> for (&hir::MacroDef<'_>, Option<Symbol>) {
     }
 }
 
-impl Clean<Deprecation> for attr::Deprecation {
-    fn clean(&self, _: &DocContext<'_>) -> Deprecation {
-        Deprecation {
-            since: self.since.map(|s| s.to_string()).filter(|s| !s.is_empty()),
-            note: self.note.map(|n| n.to_string()).filter(|n| !n.is_empty()),
-            is_since_rustc_version: self.is_since_rustc_version,
-        }
-    }
-}
-
 impl Clean<TypeBinding> for hir::TypeBinding<'_> {
     fn clean(&self, cx: &DocContext<'_>) -> TypeBinding {
         TypeBinding { name: self.ident.name.clean(cx), kind: self.kind.clean(cx) }

src/librustdoc/clean/types.rs

@@ -12,7 +12,7 @@ use rustc_ast::attr;
 use rustc_ast::util::comments::beautify_doc_string;
 use rustc_ast::{self as ast, AttrStyle};
 use rustc_ast::{FloatTy, IntTy, UintTy};
-use rustc_attr::{ConstStability, Stability, StabilityLevel};
+use rustc_attr::{ConstStability, Deprecation, Stability, StabilityLevel};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_feature::UnstableFeatures;
 use rustc_hir as hir;
@@ -151,7 +151,7 @@ impl Item {
             attrs: cx.tcx.get_attrs(def_id).clean(cx),
             visibility: cx.tcx.visibility(def_id).clean(cx),
             stability: cx.tcx.lookup_stability(def_id).cloned(),
-            deprecation: cx.tcx.lookup_deprecation(def_id).clean(cx),
+            deprecation: cx.tcx.lookup_deprecation(def_id),
             const_stability: cx.tcx.lookup_const_stability(def_id).cloned(),
         }
     }
@@ -1821,13 +1821,6 @@ crate struct ProcMacro {
     crate helpers: Vec<String>,
 }
 
-#[derive(Clone, Debug)]
-crate struct Deprecation {
-    crate since: Option<String>,
-    crate note: Option<String>,
-    crate is_since_rustc_version: bool,
-}
-
 /// An type binding on an associated type (e.g., `A = Bar` in `Foo<A = Bar>` or
 /// `A: Send + Sync` in `Foo<A: Send + Sync>`).
 #[derive(Clone, PartialEq, Eq, Debug, Hash)]

src/librustdoc/html/render/mod.rs

@@ -49,7 +49,7 @@ use std::sync::Arc;
 
 use itertools::Itertools;
 use rustc_ast_pretty::pprust;
-use rustc_attr::StabilityLevel;
+use rustc_attr::{Deprecation, StabilityLevel};
 use rustc_data_structures::flock;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::Lrc;
@@ -65,7 +65,7 @@ use rustc_span::symbol::{kw, sym, Symbol};
 use serde::ser::SerializeSeq;
 use serde::{Serialize, Serializer};
 
-use crate::clean::{self, AttributesExt, Deprecation, GetDefId, RenderedLink, SelfTy, TypeKind};
+use crate::clean::{self, AttributesExt, GetDefId, RenderedLink, SelfTy, TypeKind};
 use crate::config::{RenderInfo, RenderOptions};
 use crate::docfs::{DocFS, PathError};
 use crate::doctree;
@@ -2219,7 +2219,10 @@ fn extra_info_tags(item: &clean::Item, parent: &clean::Item) -> String {
     // The trailing space after each tag is to space it properly against the rest of the docs.
     if let Some(depr) = &item.deprecation {
         let mut message = "Deprecated";
-        if !stability::deprecation_in_effect(depr.is_since_rustc_version, depr.since.as_deref()) {
+        if !stability::deprecation_in_effect(
+            depr.is_since_rustc_version,
+            depr.since.map(|s| s.as_str()).as_deref(),
+        ) {
             message = "Deprecation planned";
         }
         tags += &tag_html("deprecated", "", message);
@@ -2268,20 +2271,24 @@ fn short_item_info(item: &clean::Item, cx: &Context, parent: Option<&clean::Item
     let mut extra_info = vec![];
     let error_codes = cx.shared.codes;
 
-    if let Some(Deprecation { ref note, ref since, is_since_rustc_version }) = item.deprecation {
+    if let Some(Deprecation { note, since, is_since_rustc_version, suggestion: _ }) =
+        item.deprecation
+    {
         // We display deprecation messages for #[deprecated] and #[rustc_deprecated]
         // but only display the future-deprecation messages for #[rustc_deprecated].
         let mut message = if let Some(since) = since {
+            let since = &since.as_str();
             if !stability::deprecation_in_effect(is_since_rustc_version, Some(since)) {
-                format!("Deprecating in {}", Escape(&since))
+                format!("Deprecating in {}", Escape(since))
             } else {
-                format!("Deprecated since {}", Escape(&since))
+                format!("Deprecated since {}", Escape(since))
             }
         } else {
             String::from("Deprecated")
         };
 
         if let Some(note) = note {
+            let note = note.as_str();
             let mut ids = cx.id_map.borrow_mut();
             let html = MarkdownHtml(
                 &note,

src/librustdoc/json/conversions.rs

@@ -77,10 +77,11 @@ impl JsonRenderer {
     }
 }
 
-impl From<clean::Deprecation> for Deprecation {
-    fn from(deprecation: clean::Deprecation) -> Self {
-        let clean::Deprecation { since, note, is_since_rustc_version: _ } = deprecation;
-        Deprecation { since, note }
+impl From<rustc_attr::Deprecation> for Deprecation {
+    fn from(deprecation: rustc_attr::Deprecation) -> Self {
+        #[rustfmt::skip]
+        let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
+        Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
     }
 }