Rollup merge of rust-lang#143238 - JonathanBrouwer:ignore_parser, r=jdonszelmann

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

Ports `ignore` to the new attribute parsing infrastructure for rust-lang#131229 (comment)

This PR duplicates a change from rust-lang#143237
Draft until that one is merged

Author: matthiaskrgr

compiler/rustc_attr_data_structures/src/attributes.rs

@@ -250,6 +250,13 @@ pub enum AttributeKind {
         span: Span,
     },
 
+    /// Represents `#[ignore]`
+    Ignore {
+        span: Span,
+        /// ignore can optionally have a reason: `#[ignore = "reason this is ignored"]`
+        reason: Option<Symbol>,
+    },
+
     /// Represents `#[inline]` and `#[rustc_force_inline]`.
     Inline(InlineAttr, Span),
 

compiler/rustc_attr_data_structures/src/encode_cross_crate.rs

@@ -26,6 +26,7 @@ impl AttributeKind {
             Deprecation { .. } => Yes,
             DocComment { .. } => Yes,
             ExportName { .. } => Yes,
+            Ignore { .. } => No,
             Inline(..) => No,
             LinkName { .. } => Yes,
             LinkSection { .. } => No,

compiler/rustc_attr_parsing/src/attributes/mod.rs

@@ -41,6 +41,7 @@ pub(crate) mod repr;
 pub(crate) mod rustc_internal;
 pub(crate) mod semantics;
 pub(crate) mod stability;
+pub(crate) mod test_attrs;
 pub(crate) mod traits;
 pub(crate) mod transparency;
 pub(crate) mod util;

compiler/rustc_attr_parsing/src/attributes/test_attrs.rs

@@ -0,0 +1,46 @@
+use rustc_attr_data_structures::AttributeKind;
+use rustc_attr_data_structures::lints::AttributeLintKind;
+use rustc_feature::{AttributeTemplate, template};
+use rustc_span::{Symbol, sym};
+
+use crate::attributes::{AttributeOrder, OnDuplicate, SingleAttributeParser};
+use crate::context::{AcceptContext, Stage};
+use crate::parser::ArgParser;
+
+pub(crate) struct IgnoreParser;
+
+impl<S: Stage> SingleAttributeParser<S> for IgnoreParser {
+    const PATH: &[Symbol] = &[sym::ignore];
+    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepLast;
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
+    const TEMPLATE: AttributeTemplate = template!(Word, NameValueStr: "reason");
+
+    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
+        Some(AttributeKind::Ignore {
+            span: cx.attr_span,
+            reason: match args {
+                ArgParser::NoArgs => None,
+                ArgParser::NameValue(name_value) => {
+                    let Some(str_value) = name_value.value_as_str() else {
+                        let suggestions = <Self as SingleAttributeParser<S>>::TEMPLATE
+                            .suggestions(false, "ignore");
+                        let span = cx.attr_span;
+                        cx.emit_lint(
+                            AttributeLintKind::IllFormedAttributeInput { suggestions },
+                            span,
+                        );
+                        return None;
+                    };
+                    Some(str_value)
+                }
+                ArgParser::List(_) => {
+                    let suggestions =
+                        <Self as SingleAttributeParser<S>>::TEMPLATE.suggestions(false, "ignore");
+                    let span = cx.attr_span;
+                    cx.emit_lint(AttributeLintKind::IllFormedAttributeInput { suggestions }, span);
+                    return None;
+                }
+            },
+        })
+    }
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -37,6 +37,7 @@ use crate::attributes::semantics::MayDangleParser;
 use crate::attributes::stability::{
     BodyStabilityParser, ConstStabilityIndirectParser, ConstStabilityParser, StabilityParser,
 };
+use crate::attributes::test_attrs::IgnoreParser;
 use crate::attributes::traits::SkipDuringMethodDispatchParser;
 use crate::attributes::transparency::TransparencyParser;
 use crate::attributes::{AttributeParser as _, Combine, Single, WithoutArgs};
@@ -126,6 +127,7 @@ attribute_parsers!(
         // tidy-alphabetical-start
         Single<DeprecationParser>,
         Single<ExportNameParser>,
+        Single<IgnoreParser>,
         Single<InlineParser>,
         Single<LinkNameParser>,
         Single<LinkSectionParser>,

compiler/rustc_hir/src/hir.rs

@@ -1303,6 +1303,7 @@ impl AttributeExt for Attribute {
             Attribute::Parsed(AttributeKind::Deprecation { span, .. }) => *span,
             Attribute::Parsed(AttributeKind::DocComment { span, .. }) => *span,
             Attribute::Parsed(AttributeKind::MayDangle(span)) => *span,
+            Attribute::Parsed(AttributeKind::Ignore { span, .. }) => *span,
             a => panic!("can't get the span of an arbitrary parsed attribute: {a:?}"),
         }
     }

compiler/rustc_parse/src/validate_attr.rs

@@ -304,6 +304,7 @@ fn emit_malformed_attribute(
             | sym::naked
             | sym::no_mangle
             | sym::non_exhaustive
+            | sym::ignore
             | sym::must_use
             | sym::track_caller
             | sym::link_name
@@ -319,8 +320,7 @@ fn emit_malformed_attribute(
 
     // Some of previously accepted forms were used in practice,
     // report them as warnings for now.
-    let should_warn =
-        |name| matches!(name, sym::doc | sym::ignore | sym::link | sym::test | sym::bench);
+    let should_warn = |name| matches!(name, sym::doc | sym::link | sym::test | sym::bench);
 
     let error_msg = format!("malformed `{name}` attribute input");
     let mut suggestions = vec![];

compiler/rustc_passes/src/check_attr.rs

@@ -215,6 +215,9 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                 Attribute::Parsed(AttributeKind::MayDangle(attr_span)) => {
                     self.check_may_dangle(hir_id, *attr_span)
                 }
+                Attribute::Parsed(AttributeKind::Ignore { span, .. }) => {
+                    self.check_generic_attr(hir_id, sym::ignore, *span, target, Target::Fn)
+                }
                 Attribute::Parsed(AttributeKind::MustUse { span, .. }) => {
                     self.check_must_use(hir_id, *span, target)
                 }
@@ -303,7 +306,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                         }
                         [sym::path, ..] => self.check_generic_attr_unparsed(hir_id, attr, target, Target::Mod),
                         [sym::macro_export, ..] => self.check_macro_export(hir_id, attr, target),
-                        [sym::ignore, ..] | [sym::should_panic, ..] => {
+                        [sym::should_panic, ..] => {
                             self.check_generic_attr_unparsed(hir_id, attr, target, Target::Fn)
                         }
                         [sym::automatically_derived, ..] => {

tests/ui/attributes/malformed-attrs.rs

@@ -219,4 +219,11 @@ macro_rules! slump {
     () => {}
 }
 
+#[ignore = 1]
+//~^ ERROR valid forms for the attribute are
+//~| WARN this was previously accepted by the compiler
+fn thing() {
+
+}
+
 fn main() {}

tests/ui/attributes/malformed-attrs.stderr

@@ -309,15 +309,6 @@ LL | #[link]
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
 
-error: valid forms for the attribute are `#[ignore]` and `#[ignore = "reason"]`
-  --> $DIR/malformed-attrs.rs:93:1
-   |
-LL | #[ignore()]
-   | ^^^^^^^^^^^
-   |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
-
 error: invalid argument
   --> $DIR/malformed-attrs.rs:187:1
    |
@@ -600,6 +591,24 @@ LL | #[inline = 5]
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
 
+error: valid forms for the attribute are `#[ignore = "reason"]` and `#[ignore]`
+  --> $DIR/malformed-attrs.rs:93:1
+   |
+LL | #[ignore()]
+   | ^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+
+error: valid forms for the attribute are `#[ignore = "reason"]` and `#[ignore]`
+  --> $DIR/malformed-attrs.rs:222:1
+   |
+LL | #[ignore = 1]
+   | ^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+
 error[E0308]: mismatched types
   --> $DIR/malformed-attrs.rs:110:23
    |
@@ -611,7 +620,7 @@ LL |     #[coroutine = 63] || {}
    = note: expected unit type `()`
               found coroutine `{coroutine@$DIR/malformed-attrs.rs:110:23: 110:25}`
 
-error: aborting due to 73 previous errors; 3 warnings emitted
+error: aborting due to 74 previous errors; 3 warnings emitted
 
 Some errors have detailed explanations: E0308, E0463, E0539, E0565, E0658, E0805.
 For more information about an error, try `rustc --explain E0308`.