Rollup merge of #143085 - JonathanBrouwer:non_exhaustive_parser, r=jdonszelmann

Port `#[non_exhaustive]` to the new attribute parsing infrastructure

Ports `non_exhaustive` to the new attribute parsing infrastructure for #131229 (comment)

r? ``@jdonszelmann``

Author: matthiaskrgr

compiler/rustc_attr_data_structures/src/attributes.rs

@@ -284,6 +284,9 @@ pub enum AttributeKind {
     /// Represents `#[no_mangle]`
     NoMangle(Span),
 
+    /// Represents `#[non_exhaustive]`
+    NonExhaustive(Span),
+
     /// Represents `#[optimize(size|speed)]`
     Optimize(OptimizeAttr, Span),
 

compiler/rustc_attr_data_structures/src/encode_cross_crate.rs

@@ -36,6 +36,7 @@ impl AttributeKind {
             Naked(..) => No,
             NoImplicitPrelude(..) => No,
             NoMangle(..) => No,
+            NonExhaustive(..) => Yes,
             Optimize(..) => No,
             PassByValue(..) => Yes,
             PubTransparent(..) => Yes,

compiler/rustc_attr_parsing/src/attributes/mod.rs

@@ -36,6 +36,7 @@ pub(crate) mod lint_helpers;
 pub(crate) mod loop_match;
 pub(crate) mod must_use;
 pub(crate) mod no_implicit_prelude;
+pub(crate) mod non_exhaustive;
 pub(crate) mod repr;
 pub(crate) mod rustc_internal;
 pub(crate) mod semantics;

compiler/rustc_attr_parsing/src/attributes/non_exhaustive.rs

@@ -0,0 +1,13 @@
+use rustc_attr_data_structures::AttributeKind;
+use rustc_span::{Span, Symbol, sym};
+
+use crate::attributes::{NoArgsAttributeParser, OnDuplicate};
+use crate::context::Stage;
+
+pub(crate) struct NonExhaustiveParser;
+
+impl<S: Stage> NoArgsAttributeParser<S> for NonExhaustiveParser {
+    const PATH: &[Symbol] = &[sym::non_exhaustive];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::NonExhaustive;
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -27,6 +27,7 @@ use crate::attributes::lint_helpers::{AsPtrParser, PassByValueParser, PubTranspa
 use crate::attributes::loop_match::{ConstContinueParser, LoopMatchParser};
 use crate::attributes::must_use::MustUseParser;
 use crate::attributes::no_implicit_prelude::NoImplicitPreludeParser;
+use crate::attributes::non_exhaustive::NonExhaustiveParser;
 use crate::attributes::repr::{AlignParser, ReprParser};
 use crate::attributes::rustc_internal::{
     RustcLayoutScalarValidRangeEnd, RustcLayoutScalarValidRangeStart,
@@ -144,6 +145,7 @@ attribute_parsers!(
         Single<WithoutArgs<MayDangleParser>>,
         Single<WithoutArgs<NoImplicitPreludeParser>>,
         Single<WithoutArgs<NoMangleParser>>,
+        Single<WithoutArgs<NonExhaustiveParser>>,
         Single<WithoutArgs<PassByValueParser>>,
         Single<WithoutArgs<PubTransparentParser>>,
         Single<WithoutArgs<TrackCallerParser>>,

compiler/rustc_hir_analysis/src/collect.rs

@@ -779,9 +779,11 @@ fn lower_variant<'tcx>(
         fields,
         parent_did.to_def_id(),
         recovered,
-        adt_kind == AdtKind::Struct && tcx.has_attr(parent_did, sym::non_exhaustive)
-            || variant_did
-                .is_some_and(|variant_did| tcx.has_attr(variant_did, sym::non_exhaustive)),
+        adt_kind == AdtKind::Struct
+            && find_attr!(tcx.get_all_attrs(parent_did), AttributeKind::NonExhaustive(..))
+            || variant_did.is_some_and(|variant_did| {
+                find_attr!(tcx.get_all_attrs(variant_did), AttributeKind::NonExhaustive(..))
+            }),
     )
 }
 

compiler/rustc_middle/src/ty/adt.rs

@@ -4,6 +4,7 @@ use std::ops::Range;
 use std::str;
 
 use rustc_abi::{FIRST_VARIANT, ReprOptions, VariantIdx};
+use rustc_attr_data_structures::{AttributeKind, find_attr};
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::intern::Interned;
@@ -278,7 +279,9 @@ impl AdtDefData {
         debug!("AdtDef::new({:?}, {:?}, {:?}, {:?})", did, kind, variants, repr);
         let mut flags = AdtFlags::NO_ADT_FLAGS;
 
-        if kind == AdtKind::Enum && tcx.has_attr(did, sym::non_exhaustive) {
+        if kind == AdtKind::Enum
+            && find_attr!(tcx.get_all_attrs(did), AttributeKind::NonExhaustive(..))
+        {
             debug!("found non-exhaustive variant list for {:?}", did);
             flags = flags | AdtFlags::IS_VARIANT_LIST_NON_EXHAUSTIVE;
         }

compiler/rustc_parse/src/validate_attr.rs

@@ -303,6 +303,7 @@ fn emit_malformed_attribute(
             | sym::rustc_allow_const_fn_unstable
             | sym::naked
             | sym::no_mangle
+            | sym::non_exhaustive
             | sym::must_use
             | sym::track_caller
             | sym::link_name

compiler/rustc_passes/src/check_attr.rs

@@ -194,6 +194,9 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                 Attribute::Parsed(AttributeKind::TrackCaller(attr_span)) => {
                     self.check_track_caller(hir_id, *attr_span, attrs, span, target)
                 }
+                Attribute::Parsed(AttributeKind::NonExhaustive(attr_span)) => {
+                    self.check_non_exhaustive(hir_id, *attr_span, span, target, item)
+                }
                 Attribute::Parsed(
                     AttributeKind::RustcLayoutScalarValidRangeStart(_num, attr_span)
                     | AttributeKind::RustcLayoutScalarValidRangeEnd(_num, attr_span),
@@ -237,7 +240,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                         [sym::no_sanitize, ..] => {
                             self.check_no_sanitize(attr, span, target)
                         }
-                        [sym::non_exhaustive, ..] => self.check_non_exhaustive(hir_id, attr, span, target, item),
                         [sym::marker, ..] => self.check_marker(hir_id, attr, span, target),
                         [sym::thread_local, ..] => self.check_thread_local(attr, span, target),
                         [sym::doc, ..] => self.check_doc_attrs(
@@ -779,7 +781,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
     fn check_non_exhaustive(
         &self,
         hir_id: HirId,
-        attr: &Attribute,
+        attr_span: Span,
         span: Span,
         target: Target,
         item: Option<ItemLike<'_>>,
@@ -794,7 +796,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                     && fields.iter().any(|f| f.default.is_some())
                 {
                     self.dcx().emit_err(errors::NonExhaustiveWithDefaultFieldValues {
-                        attr_span: attr.span(),
+                        attr_span,
                         defn_span: span,
                     });
                 }
@@ -805,13 +807,11 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
             // erroneously allowed it and some crates used it accidentally, to be compatible
             // with crates depending on them, we can't throw an error here.
             Target::Field | Target::Arm | Target::MacroDef => {
-                self.inline_attr_str_error_with_macro_def(hir_id, attr.span(), "non_exhaustive");
+                self.inline_attr_str_error_with_macro_def(hir_id, attr_span, "non_exhaustive");
             }
             _ => {
-                self.dcx().emit_err(errors::NonExhaustiveWrongLocation {
-                    attr_span: attr.span(),
-                    defn_span: span,
-                });
+                self.dcx()
+                    .emit_err(errors::NonExhaustiveWrongLocation { attr_span, defn_span: span });
             }
         }
     }

compiler/rustc_resolve/src/diagnostics.rs

@@ -5,7 +5,7 @@ use rustc_ast::{
     self as ast, CRATE_NODE_ID, Crate, ItemKind, MetaItemInner, MetaItemKind, ModKind, NodeId, Path,
 };
 use rustc_ast_pretty::pprust;
-use rustc_attr_data_structures::{self as attr, Stability};
+use rustc_attr_data_structures::{self as attr, AttributeKind, Stability, find_attr};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::unord::{UnordMap, UnordSet};
 use rustc_errors::codes::*;
@@ -1998,9 +1998,9 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         // Otherwise, point out if the struct has any private fields.
         if let Some(def_id) = res.opt_def_id()
             && !def_id.is_local()
-            && let Some(attr) = self.tcx.get_attr(def_id, sym::non_exhaustive)
+            && let Some(attr_span) = find_attr!(self.tcx.get_all_attrs(def_id), AttributeKind::NonExhaustive(span) => *span)
         {
-            non_exhaustive = Some(attr.span());
+            non_exhaustive = Some(attr_span);
         } else if let Some(span) = ctor_fields_span {
             let label = errors::ConstructorPrivateIfAnyFieldPrivate { span };
             err.subdiagnostic(label);