Rewrite inline attribute parser to use new infrastructure and improve diagnostics for all parsed attributes

compiler/rustc_attr_data_structures/src/attributes.rs

@@ -8,7 +8,7 @@ use thin_vec::ThinVec;
 
 use crate::{DefaultBodyStability, PartialConstStability, PrintAttribute, RustcVersion, Stability};
 
-#[derive(Copy, Clone, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
+#[derive(Copy, Clone, PartialEq, Encodable, Decodable, Debug, HashStable_Generic, PrintAttribute)]
 pub enum InlineAttr {
     None,
     Hint,
@@ -188,12 +188,14 @@ pub enum AttributeKind {
     /// Represents [`#[doc]`](https://doc.rust-lang.org/stable/rustdoc/write-documentation/the-doc-attribute.html).
     DocComment { style: AttrStyle, kind: CommentKind, span: Span, comment: Symbol },
 
+    /// Represents `#[inline]`.
+    Inline(InlineAttr, Span),
+
     /// Represents `#[rustc_macro_transparency]`.
     MacroTransparency(Transparency),
 
     /// Represents [`#[repr]`](https://doc.rust-lang.org/stable/reference/type-layout.html#representations).
     Repr(ThinVec<(ReprAttr, Span)>),
-
     /// Represents `#[stable]`, `#[unstable]` and `#[rustc_allowed_through_unstable_modules]`.
     Stability {
         stability: Stability,

compiler/rustc_attr_data_structures/src/lints.rs

@@ -11,4 +11,5 @@ pub struct AttributeLint<Id> {
 #[derive(Clone, Debug, HashStable_Generic)]
 pub enum AttributeLintKind {
     UnusedDuplicate { this: Span, other: Span, warning: bool },
+    IllFormedAttributeInput { suggestions: Vec<String> },
 }

compiler/rustc_attr_parsing/messages.ftl

@@ -23,8 +23,10 @@ attr_parsing_expects_feature_list =
 attr_parsing_expects_features =
     `{$name}` expects feature names
 
-attr_parsing_incorrect_meta_item = expected a quoted string literal
-attr_parsing_incorrect_meta_item_suggestion = consider surrounding this with quotes
+attr_parsing_ill_formed_attribute_input = {$num_suggestions ->
+        [1] attribute must be of the form {$suggestions}
+        *[other] valid forms for the attribute are {$suggestions}
+    }
 
 attr_parsing_incorrect_repr_format_align_one_arg =
     incorrect `repr(align)` attribute format: `align` takes exactly one argument in parentheses
@@ -81,9 +83,6 @@ attr_parsing_missing_note =
 attr_parsing_missing_since =
     missing 'since'
 
-attr_parsing_multiple_item =
-    multiple '{$item}' items
-
 attr_parsing_multiple_stability_levels =
     multiple stability levels
 
@@ -122,10 +121,6 @@ attr_parsing_unsupported_literal_cfg_boolean =
     literal in `cfg` predicate value must be a boolean
 attr_parsing_unsupported_literal_cfg_string =
     literal in `cfg` predicate value must be a string
-attr_parsing_unsupported_literal_deprecated_kv_pair =
-    item in `deprecated` must be a key/value pair
-attr_parsing_unsupported_literal_deprecated_string =
-    literal in `deprecated` value must be a string
 attr_parsing_unsupported_literal_generic =
     unsupported literal
 attr_parsing_unsupported_literal_suggestion =
@@ -136,6 +131,7 @@ attr_parsing_unused_duplicate =
     .suggestion = remove this attribute
     .note = attribute also specified here
     .warn = {-passes_previously_accepted}
+
 attr_parsing_unused_multiple =
     multiple `{$name}` attributes
     .suggestion = remove this attribute

compiler/rustc_attr_parsing/src/attributes/allow_unstable.rs

@@ -1,6 +1,7 @@
 use std::iter;
 
 use rustc_attr_data_structures::AttributeKind;
+use rustc_feature::{AttributeTemplate, template};
 use rustc_span::{Span, Symbol, sym};
 
 use super::{CombineAttributeParser, ConvertFn};
@@ -13,6 +14,7 @@ impl<S: Stage> CombineAttributeParser<S> for AllowInternalUnstableParser {
     const PATH: &[Symbol] = &[sym::allow_internal_unstable];
     type Item = (Symbol, Span);
     const CONVERT: ConvertFn<Self::Item> = AttributeKind::AllowInternalUnstable;
+    const TEMPLATE: AttributeTemplate = template!(Word, List: "feat1, feat2, ...");
 
     fn extend<'c>(
         cx: &'c mut AcceptContext<'_, '_, S>,
@@ -29,6 +31,7 @@ impl<S: Stage> CombineAttributeParser<S> for AllowConstFnUnstableParser {
     const PATH: &[Symbol] = &[sym::rustc_allow_const_fn_unstable];
     type Item = Symbol;
     const CONVERT: ConvertFn<Self::Item> = AttributeKind::AllowConstFnUnstable;
+    const TEMPLATE: AttributeTemplate = template!(Word, List: "feat1, feat2, ...");
 
     fn extend<'c>(
         cx: &'c mut AcceptContext<'_, '_, S>,

compiler/rustc_attr_parsing/src/attributes/confusables.rs

@@ -1,4 +1,5 @@
 use rustc_attr_data_structures::AttributeKind;
+use rustc_feature::template;
 use rustc_span::{Span, Symbol, sym};
 use thin_vec::ThinVec;
 
@@ -13,37 +14,33 @@ pub(crate) struct ConfusablesParser {
 }
 
 impl<S: Stage> AttributeParser<S> for ConfusablesParser {
-    const ATTRIBUTES: AcceptMapping<Self, S> = &[(&[sym::rustc_confusables], |this, cx, args| {
-        let Some(list) = args.list() else {
-            // FIXME(jdonszelmann): error when not a list? Bring validation code here.
-            //       NOTE: currently subsequent attributes are silently ignored using
-            //       tcx.get_attr().
-            return;
-        };
-
-        if list.is_empty() {
-            cx.emit_err(session_diagnostics::EmptyConfusables { span: cx.attr_span });
-        }
-
-        for param in list.mixed() {
-            let span = param.span();
-
-            let Some(lit) = param.lit() else {
-                cx.emit_err(session_diagnostics::IncorrectMetaItem {
-                    span,
-                    suggestion: Some(session_diagnostics::IncorrectMetaItemSuggestion {
-                        lo: span.shrink_to_lo(),
-                        hi: span.shrink_to_hi(),
-                    }),
-                });
-                continue;
+    const ATTRIBUTES: AcceptMapping<Self, S> = &[(
+        &[sym::rustc_confusables],
+        template!(List: r#""name1", "name2", ..."#),
+        |this, cx, args| {
+            let Some(list) = args.list() else {
+                cx.expected_list(cx.attr_span);
+                return;
             };
 
-            this.confusables.push(lit.symbol);
-        }
+            if list.is_empty() {
+                cx.emit_err(session_diagnostics::EmptyConfusables { span: cx.attr_span });
+            }
+
+            for param in list.mixed() {
+                let span = param.span();
+
+                let Some(lit) = param.lit().and_then(|i| i.value_str()) else {
+                    cx.expected_string_literal(span, param.lit());
+                    continue;
+                };
+
+                this.confusables.push(lit);
+            }
 
-        this.first_span.get_or_insert(cx.attr_span);
-    })];
+            this.first_span.get_or_insert(cx.attr_span);
+        },
+    )];
 
     fn finalize(self, _cx: &FinalizeContext<'_, '_, S>) -> Option<AttributeKind> {
         if self.confusables.is_empty() {

compiler/rustc_attr_parsing/src/attributes/deprecation.rs

@@ -1,12 +1,12 @@
 use rustc_attr_data_structures::{AttributeKind, DeprecatedSince, Deprecation};
+use rustc_feature::{AttributeTemplate, template};
 use rustc_span::{Span, Symbol, sym};
 
 use super::util::parse_version;
 use super::{AttributeOrder, OnDuplicate, SingleAttributeParser};
 use crate::context::{AcceptContext, Stage};
 use crate::parser::ArgParser;
 use crate::session_diagnostics;
-use crate::session_diagnostics::UnsupportedLiteralReason;
 
 pub(crate) struct DeprecationParser;
 
@@ -18,25 +18,18 @@ fn get<S: Stage>(
     item: &Option<Symbol>,
 ) -> Option<Symbol> {
     if item.is_some() {
-        cx.emit_err(session_diagnostics::MultipleItem { span: param_span, item: name.to_string() });
+        cx.duplicate_key(param_span, name);
         return None;
     }
     if let Some(v) = arg.name_value() {
         if let Some(value_str) = v.value_as_str() {
             Some(value_str)
         } else {
-            let lit = v.value_as_lit();
-            cx.emit_err(session_diagnostics::UnsupportedLiteral {
-                span: v.value_span,
-                reason: UnsupportedLiteralReason::DeprecatedString,
-                is_bytestr: lit.kind.is_bytestr(),
-                start_point_span: cx.sess().source_map().start_point(lit.span),
-            });
+            cx.expected_string_literal(v.value_span, Some(&v.value_as_lit()));
             None
         }
     } else {
-        // FIXME(jdonszelmann): suggestion?
-        cx.emit_err(session_diagnostics::IncorrectMetaItem { span: param_span, suggestion: None });
+        cx.expected_name_value(param_span, Some(name));
         None
     }
 }
@@ -45,6 +38,11 @@ impl<S: Stage> SingleAttributeParser<S> for DeprecationParser {
     const PATH: &[Symbol] = &[sym::deprecated];
     const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepFirst;
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
+    const TEMPLATE: AttributeTemplate = template!(
+        Word,
+        List: r#"/*opt*/ since = "version", /*opt*/ note = "reason""#,
+        NameValueStr: "reason"
+    );
 
     fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
         let features = cx.features();
@@ -55,57 +53,60 @@ impl<S: Stage> SingleAttributeParser<S> for DeprecationParser {
 
         let is_rustc = features.staged_api();
 
-        if let Some(value) = args.name_value()
-            && let Some(value_str) = value.value_as_str()
-        {
-            note = Some(value_str)
-        } else if let Some(list) = args.list() {
-            for param in list.mixed() {
-                let param_span = param.span();
-                let Some(param) = param.meta_item() else {
-                    cx.emit_err(session_diagnostics::UnsupportedLiteral {
-                        span: param_span,
-                        reason: UnsupportedLiteralReason::DeprecatedKvPair,
-                        is_bytestr: false,
-                        start_point_span: cx.sess().source_map().start_point(param_span),
-                    });
-                    return None;
-                };
+        match args {
+            ArgParser::NoArgs => {
+                // ok
+            }
+            ArgParser::List(list) => {
+                for param in list.mixed() {
+                    let Some(param) = param.meta_item() else {
+                        cx.unexpected_literal(param.span());
+                        return None;
+                    };
 
-                let ident_name = param.path().word_sym();
+                    let ident_name = param.path().word_sym();
 
-                match ident_name {
-                    Some(name @ sym::since) => {
-                        since = Some(get(cx, name, param_span, param.args(), &since)?);
-                    }
-                    Some(name @ sym::note) => {
-                        note = Some(get(cx, name, param_span, param.args(), &note)?);
-                    }
-                    Some(name @ sym::suggestion) => {
-                        if !features.deprecated_suggestion() {
-                            cx.emit_err(session_diagnostics::DeprecatedItemSuggestion {
-                                span: param_span,
-                                is_nightly: cx.sess().is_nightly_build(),
-                                details: (),
-                            });
+                    match ident_name {
+                        Some(name @ sym::since) => {
+                            since = Some(get(cx, name, param.span(), param.args(), &since)?);
+                        }
+                        Some(name @ sym::note) => {
+                            note = Some(get(cx, name, param.span(), param.args(), &note)?);
                         }
+                        Some(name @ sym::suggestion) => {
+                            if !features.deprecated_suggestion() {
+                                cx.emit_err(session_diagnostics::DeprecatedItemSuggestion {
+                                    span: param.span(),
+                                    is_nightly: cx.sess().is_nightly_build(),
+                                    details: (),
+                                });
+                            }
 
-                        suggestion = Some(get(cx, name, param_span, param.args(), &suggestion)?);
-                    }
-                    _ => {
-                        cx.emit_err(session_diagnostics::UnknownMetaItem {
-                            span: param_span,
-                            item: param.path().to_string(),
-                            expected: if features.deprecated_suggestion() {
-                                &["since", "note", "suggestion"]
-                            } else {
-                                &["since", "note"]
-                            },
-                        });
-                        return None;
+                            suggestion =
+                                Some(get(cx, name, param.span(), param.args(), &suggestion)?);
+                        }
+                        _ => {
+                            cx.unknown_key(
+                                param.span(),
+                                param.path().to_string(),
+                                if features.deprecated_suggestion() {
+                                    &["since", "note", "suggestion"]
+                                } else {
+                                    &["since", "note"]
+                                },
+                            );
+                            return None;
+                        }
                     }
                 }
             }
+            ArgParser::NameValue(v) => {
+                let Some(value) = v.value_as_str() else {
+                    cx.expected_string_literal(v.value_span, Some(v.value_as_lit()));
+                    return None;
+                };
+                note = Some(value);
+            }
         }
 
         let since = if let Some(since) = since {

compiler/rustc_attr_parsing/src/attributes/inline.rs

@@ -29,7 +29,7 @@ impl<S: Stage> SingleAttributeParser<S> for InlineParser {
                     return None;
                 };
 
-                match l.meta_item().and_then(|i| i.word_without_args().map(|i| i.name)) {
+                match l.meta_item().and_then(|i| i.path().word_sym()) {
                     Some(sym::always) => {
                         Some(AttributeKind::Inline(InlineAttr::Always, cx.attr_span))
                     }
@@ -63,7 +63,7 @@ impl<S: Stage> SingleAttributeParser<S> for RustcForceInlineParser {
     const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::WarnButFutureError;
     const TEMPLATE: AttributeTemplate = template!(Word, List: "reason", NameValueStr: "reason");
 
-    fn convert(cx: &AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
+    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser<'_>) -> Option<AttributeKind> {
         let reason = match args {
             ArgParser::NoArgs => None,
             ArgParser::List(list) => {
@@ -73,15 +73,15 @@ impl<S: Stage> SingleAttributeParser<S> for RustcForceInlineParser {
                 };
 
                 let Some(reason) = l.lit().and_then(|i| i.kind.str()) else {
-                    cx.expected_string_literal(l.span());
+                    cx.expected_string_literal(l.span(), l.lit());
                     return None;
                 };
 
                 Some(reason)
             }
             ArgParser::NameValue(v) => {
                 let Some(reason) = v.value_as_str() else {
-                    cx.expected_string_literal(v.value_span);
+                    cx.expected_string_literal(v.value_span, Some(v.value_as_lit()));
                     return None;
                 };