Port #[rustc_has_incoherent_inherent_impls] to attribute parser

compiler/rustc_attr_parsing/src/attributes/rustc_internal.rs

@@ -305,3 +305,18 @@ impl<S: Stage> SingleAttributeParser<S> for RustcScalableVectorParser {
         Some(AttributeKind::RustcScalableVector { element_count: Some(n), span: cx.attr_span })
     }
 }
+
+pub(crate) struct RustcHasIncoherentInherentImplsParser;
+
+impl<S: Stage> NoArgsAttributeParser<S> for RustcHasIncoherentInherentImplsParser {
+    const PATH: &[Symbol] = &[sym::rustc_has_incoherent_inherent_impls];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[
+        Allow(Target::Trait),
+        Allow(Target::Struct),
+        Allow(Target::Enum),
+        Allow(Target::Union),
+        Allow(Target::ForeignTy),
+    ]);
+    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcHasIncoherentInherentImpls;
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -62,12 +62,12 @@ use crate::attributes::proc_macro_attrs::{
 use crate::attributes::prototype::CustomMirParser;
 use crate::attributes::repr::{AlignParser, AlignStaticParser, ReprParser};
 use crate::attributes::rustc_internal::{
-    RustcLayoutScalarValidRangeEndParser, RustcLayoutScalarValidRangeStartParser,
-    RustcLegacyConstGenericsParser, RustcLintDiagnosticsParser, RustcLintOptDenyFieldAccessParser,
-    RustcLintOptTyParser, RustcLintQueryInstabilityParser,
-    RustcLintUntrackedQueryInformationParser, RustcMainParser, RustcMustImplementOneOfParser,
-    RustcNeverReturnsNullPointerParser, RustcNoImplicitAutorefsParser,
-    RustcObjectLifetimeDefaultParser, RustcScalableVectorParser,
+    RustcHasIncoherentInherentImplsParser, RustcLayoutScalarValidRangeEndParser,
+    RustcLayoutScalarValidRangeStartParser, RustcLegacyConstGenericsParser,
+    RustcLintDiagnosticsParser, RustcLintOptDenyFieldAccessParser, RustcLintOptTyParser,
+    RustcLintQueryInstabilityParser, RustcLintUntrackedQueryInformationParser, RustcMainParser,
+    RustcMustImplementOneOfParser, RustcNeverReturnsNullPointerParser,
+    RustcNoImplicitAutorefsParser, RustcObjectLifetimeDefaultParser, RustcScalableVectorParser,
     RustcSimdMonomorphizeLaneLimitParser,
 };
 use crate::attributes::semantics::MayDangleParser;
@@ -264,6 +264,7 @@ attribute_parsers!(
         Single<WithoutArgs<ProcMacroParser>>,
         Single<WithoutArgs<PubTransparentParser>>,
         Single<WithoutArgs<RustcCoherenceIsCoreParser>>,
+        Single<WithoutArgs<RustcHasIncoherentInherentImplsParser>>,
         Single<WithoutArgs<RustcLintDiagnosticsParser>>,
         Single<WithoutArgs<RustcLintOptTyParser>>,
         Single<WithoutArgs<RustcLintQueryInstabilityParser>>,

compiler/rustc_hir/src/attrs/data_structures.rs

@@ -880,6 +880,9 @@ pub enum AttributeKind {
     /// Represents `#[rustc_coherence_is_core]`
     RustcCoherenceIsCore(Span),
 
+    /// Represents `#[rustc_has_incoherent_inherent_impls]`
+    RustcHasIncoherentInherentImpls,
+
     /// Represents `#[rustc_layout_scalar_valid_range_end]`.
     RustcLayoutScalarValidRangeEnd(Box<u128>, Span),
 

compiler/rustc_hir/src/attrs/encode_cross_crate.rs

@@ -95,6 +95,7 @@ impl AttributeKind {
             Repr { .. } => No,
             RustcBuiltinMacro { .. } => Yes,
             RustcCoherenceIsCore(..) => No,
+            RustcHasIncoherentInherentImpls => Yes,
             RustcLayoutScalarValidRangeEnd(..) => Yes,
             RustcLayoutScalarValidRangeStart(..) => Yes,
             RustcLegacyConstGenerics { .. } => Yes,

compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs

@@ -15,7 +15,7 @@ use rustc_hir::find_attr;
 use rustc_middle::bug;
 use rustc_middle::ty::fast_reject::{SimplifiedType, TreatParams, simplify_type};
 use rustc_middle::ty::{self, CrateInherentImpls, Ty, TyCtxt};
-use rustc_span::{ErrorGuaranteed, sym};
+use rustc_span::ErrorGuaranteed;
 
 use crate::errors;
 
@@ -79,7 +79,10 @@ impl<'tcx> InherentCollect<'tcx> {
         }
 
         if self.tcx.features().rustc_attrs() {
-            if !self.tcx.has_attr(ty_def_id, sym::rustc_has_incoherent_inherent_impls) {
+            if !find_attr!(
+                self.tcx.get_all_attrs(ty_def_id),
+                AttributeKind::RustcHasIncoherentInherentImpls
+            ) {
                 let impl_span = self.tcx.def_span(impl_def_id);
                 return Err(self.tcx.dcx().emit_err(errors::InherentTyOutside { span: impl_span }));
             }

compiler/rustc_middle/src/ty/trait_def.rs

@@ -2,11 +2,11 @@ use std::iter;
 
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_errors::ErrorGuaranteed;
-use rustc_hir as hir;
+use rustc_hir::attrs::AttributeKind;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
+use rustc_hir::{self as hir, find_attr};
 use rustc_macros::{Decodable, Encodable, HashStable};
-use rustc_span::symbol::sym;
 use tracing::debug;
 
 use crate::query::LocalCrate;
@@ -241,7 +241,7 @@ pub(super) fn trait_impls_of_provider(tcx: TyCtxt<'_>, trait_id: DefId) -> Trait
 /// Query provider for `incoherent_impls`.
 pub(super) fn incoherent_impls_provider(tcx: TyCtxt<'_>, simp: SimplifiedType) -> &[DefId] {
     if let Some(def_id) = simp.def()
-        && !tcx.has_attr(def_id, sym::rustc_has_incoherent_inherent_impls)
+        && !find_attr!(tcx.get_all_attrs(def_id), AttributeKind::RustcHasIncoherentInherentImpls)
     {
         return &[];
     }

compiler/rustc_passes/messages.ftl

@@ -244,10 +244,6 @@ passes_function_not_have_default_implementation = function doesn't have a defaul
 passes_functions_names_duplicated = functions names are duplicated
     .note = all `#[rustc_must_implement_one_of]` arguments must be unique
 
-passes_has_incoherent_inherent_impl =
-    `rustc_has_incoherent_inherent_impls` attribute should be applied to types or traits
-    .label = only adts, extern types and traits are supported
-
 passes_ignored_derived_impls =
     `{$name}` has {$trait_list_len ->
       [one] a derived impl

compiler/rustc_passes/src/check_attr.rs

@@ -306,6 +306,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                     | AttributeKind::CfgAttrTrace
                     | AttributeKind::ThreadLocal
                     | AttributeKind::CfiEncoding { .. }
+                    | AttributeKind::RustcHasIncoherentInherentImpls
                 ) => { /* do nothing  */ }
                 Attribute::Unparsed(attr_item) => {
                     style = Some(attr_item.style);
@@ -325,9 +326,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                         | [sym::rustc_then_this_would_need, ..] => self.check_rustc_dirty_clean(attr),
                         [sym::collapse_debuginfo, ..] => self.check_collapse_debuginfo(attr, span, target),
                         [sym::must_not_suspend, ..] => self.check_must_not_suspend(attr, span, target),
-                        [sym::rustc_has_incoherent_inherent_impls, ..] => {
-                            self.check_has_incoherent_inherent_impls(attr, span, target)
-                        }
                         [sym::autodiff_forward, ..] | [sym::autodiff_reverse, ..] => {
                             self.check_autodiff(hir_id, attr, span, target)
                         }
@@ -1164,17 +1162,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
         }
     }
 
-    fn check_has_incoherent_inherent_impls(&self, attr: &Attribute, span: Span, target: Target) {
-        match target {
-            Target::Trait | Target::Struct | Target::Enum | Target::Union | Target::ForeignTy => {}
-            _ => {
-                self.tcx
-                    .dcx()
-                    .emit_err(errors::HasIncoherentInherentImpl { attr_span: attr.span(), span });
-            }
-        }
-    }
-
     fn check_ffi_pure(&self, attr_span: Span, attrs: &[Attribute]) {
         if find_attr!(attrs, AttributeKind::FfiConst(_)) {
             // `#[ffi_const]` functions cannot be `#[ffi_pure]`

compiler/rustc_passes/src/errors.rs

@@ -187,15 +187,6 @@ pub(crate) struct DocAttrNotCrateLevel<'a> {
     pub attr_name: &'a str,
 }
 
-#[derive(Diagnostic)]
-#[diag(passes_has_incoherent_inherent_impl)]
-pub(crate) struct HasIncoherentInherentImpl {
-    #[primary_span]
-    pub attr_span: Span,
-    #[label]
-    pub span: Span,
-}
-
 #[derive(Diagnostic)]
 #[diag(passes_both_ffi_const_and_pure, code = E0757)]
 pub(crate) struct BothFfiConstAndPure {