Port #[automatically_derived] to the new attribute parsing infrastructure

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

Author: JonathanBrouwer

compiler/rustc_ast/src/attr/mod.rs

@@ -217,6 +217,10 @@ impl AttributeExt for Attribute {
             _ => None,
         }
     }
+
+    fn is_automatically_derived_attr(&self) -> bool {
+        self.has_name(sym::automatically_derived)
+    }
 }
 
 impl Attribute {
@@ -810,6 +814,7 @@ pub trait AttributeExt: Debug {
             .iter()
             .any(|kind| self.has_name(*kind))
     }
+    fn is_automatically_derived_attr(&self) -> bool;
 
     /// Returns the documentation and its kind if this is a doc comment or a sugared doc comment.
     /// * `///doc` returns `Some(("doc", CommentKind::Line))`.

compiler/rustc_attr_data_structures/src/attributes.rs

@@ -204,6 +204,9 @@ pub enum AttributeKind {
     /// Represents `#[rustc_as_ptr]` (used by the `dangling_pointers_from_temporaries` lint).
     AsPtr(Span),
 
+    /// Represents `#[automatically_derived]`
+    AutomaticallyDerived(Span),
+
     /// Represents `#[rustc_default_body_unstable]`.
     BodyStability {
         stability: DefaultBodyStability,

compiler/rustc_attr_data_structures/src/encode_cross_crate.rs

@@ -17,6 +17,7 @@ impl AttributeKind {
             AllowConstFnUnstable(..) => No,
             AllowInternalUnstable(..) => Yes,
             AsPtr(..) => Yes,
+            AutomaticallyDerived(..) => Yes,
             BodyStability { .. } => No,
             Cold(..) => No,
             Confusables { .. } => Yes,

compiler/rustc_attr_parsing/src/attributes/lint_helpers.rs

@@ -24,3 +24,10 @@ impl<S: Stage> NoArgsAttributeParser<S> for PassByValueParser {
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
     const CREATE: fn(Span) -> AttributeKind = AttributeKind::PassByValue;
 }
+
+pub(crate) struct AutomaticallyDerivedParser;
+impl<S: Stage> NoArgsAttributeParser<S> for AutomaticallyDerivedParser {
+    const PATH: &[Symbol] = &[sym::automatically_derived];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::AutomaticallyDerived;
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -27,7 +27,9 @@ use crate::attributes::link_attrs::{
     ExportStableParser, FfiConstParser, FfiPureParser, LinkNameParser, LinkSectionParser,
     StdInternalSymbolParser,
 };
-use crate::attributes::lint_helpers::{AsPtrParser, PassByValueParser, PubTransparentParser};
+use crate::attributes::lint_helpers::{
+    AsPtrParser, AutomaticallyDerivedParser, PassByValueParser, PubTransparentParser,
+};
 use crate::attributes::loop_match::{ConstContinueParser, LoopMatchParser};
 use crate::attributes::must_use::MustUseParser;
 use crate::attributes::no_implicit_prelude::NoImplicitPreludeParser;
@@ -147,6 +149,7 @@ attribute_parsers!(
         Single<SkipDuringMethodDispatchParser>,
         Single<TransparencyParser>,
         Single<WithoutArgs<AsPtrParser>>,
+        Single<WithoutArgs<AutomaticallyDerivedParser>>,
         Single<WithoutArgs<ColdParser>>,
         Single<WithoutArgs<ConstContinueParser>>,
         Single<WithoutArgs<ConstStabilityIndirectParser>>,

compiler/rustc_hir/src/hir.rs

@@ -1304,6 +1304,7 @@ impl AttributeExt for Attribute {
             Attribute::Parsed(AttributeKind::DocComment { span, .. }) => *span,
             Attribute::Parsed(AttributeKind::MayDangle(span)) => *span,
             Attribute::Parsed(AttributeKind::Ignore { span, .. }) => *span,
+            Attribute::Parsed(AttributeKind::AutomaticallyDerived(span)) => *span,
             a => panic!("can't get the span of an arbitrary parsed attribute: {a:?}"),
         }
     }
@@ -1334,6 +1335,11 @@ impl AttributeExt for Attribute {
             _ => None,
         }
     }
+
+    fn is_automatically_derived_attr(&self) -> bool {
+        matches!(self, Attribute::Parsed(AttributeKind::AutomaticallyDerived(..)))
+    }
+
     #[inline]
     fn doc_str_and_comment_kind(&self) -> Option<(Symbol, CommentKind)> {
         match &self {

compiler/rustc_lint/src/default_could_be_derived.rs

@@ -1,3 +1,4 @@
+use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{Applicability, Diag};
 use rustc_hir as hir;
@@ -62,7 +63,7 @@ impl<'tcx> LateLintPass<'tcx> for DefaultCouldBeDerived {
         let hir::ImplItemKind::Fn(_sig, body_id) = impl_item.kind else { return };
         let assoc = cx.tcx.associated_item(impl_item.owner_id);
         let parent = assoc.container_id(cx.tcx);
-        if cx.tcx.has_attr(parent, sym::automatically_derived) {
+        if find_attr!(cx.tcx.get_all_attrs(parent), AttributeKind::AutomaticallyDerived(..)) {
             // We don't care about what `#[derive(Default)]` produces in this lint.
             return;
         }

compiler/rustc_lint/src/levels.rs

@@ -644,7 +644,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
     ) {
         let sess = self.sess;
         for (attr_index, attr) in attrs.iter().enumerate() {
-            if attr.has_name(sym::automatically_derived) {
+            if attr.is_automatically_derived_attr() {
                 self.insert(
                     LintId::of(SINGLE_USE_LIFETIMES),
                     LevelAndSource {

compiler/rustc_middle/src/ty/mod.rs

@@ -28,7 +28,7 @@ use rustc_abi::{Align, FieldIdx, Integer, IntegerType, ReprFlags, ReprOptions, V
 use rustc_ast::expand::StrippedCfgItem;
 use rustc_ast::node_id::NodeMap;
 pub use rustc_ast_ir::{Movability, Mutability, try_visit};
-use rustc_attr_data_structures::AttributeKind;
+use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_data_structures::intern::Interned;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
@@ -2034,7 +2034,7 @@ impl<'tcx> TyCtxt<'tcx> {
 
     /// Check if the given `DefId` is `#\[automatically_derived\]`.
     pub fn is_automatically_derived(self, def_id: DefId) -> bool {
-        self.has_attr(def_id, sym::automatically_derived)
+        find_attr!(self.get_all_attrs(def_id), AttributeKind::AutomaticallyDerived(..))
     }
 
     /// Looks up the span of `impl_did` if the impl is local; otherwise returns `Err`

compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs

@@ -2,6 +2,7 @@ use core::ops::ControlFlow;
 
 use rustc_abi::{FieldIdx, VariantIdx};
 use rustc_apfloat::Float;
+use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Diag;
 use rustc_hir as hir;
@@ -15,7 +16,7 @@ use rustc_middle::ty::{
 };
 use rustc_middle::{mir, span_bug};
 use rustc_span::def_id::DefId;
-use rustc_span::{DUMMY_SP, Span, sym};
+use rustc_span::{DUMMY_SP, Span};
 use rustc_trait_selection::traits::ObligationCause;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
 use tracing::{debug, instrument, trace};
@@ -495,7 +496,8 @@ fn type_has_partial_eq_impl<'tcx>(
     let mut structural_peq = false;
     let mut impl_def_id = None;
     for def_id in tcx.non_blanket_impls_for_ty(partial_eq_trait_id, ty) {
-        automatically_derived = tcx.has_attr(def_id, sym::automatically_derived);
+        automatically_derived =
+            find_attr!(tcx.get_all_attrs(def_id), AttributeKind::AutomaticallyDerived(..));
         impl_def_id = Some(def_id);
     }
     for _ in tcx.non_blanket_impls_for_ty(structural_partial_eq_trait_id, ty) {