Rollup merge of rust-lang#67052 - Centril:config-1, r=petrochenkov

Ditch `parse_in_attr`

Fixes rust-lang#66940

r? @petrochenkov

src/librustc_parse/config.rs

@@ -8,18 +8,19 @@
 //!
 //! [#64197]: https://github.com/rust-lang/rust/issues/64197
 
-use crate::validate_attr;
+use crate::{parse_in, validate_attr};
 use rustc_feature::Features;
 use rustc_errors::Applicability;
 use syntax::attr::HasAttrs;
 use syntax::feature_gate::{feature_err, get_features};
 use syntax::attr;
-use syntax::ast;
+use syntax::ast::{self, Attribute, AttrItem, MetaItem};
 use syntax::edition::Edition;
 use syntax::mut_visit::*;
 use syntax::ptr::P;
 use syntax::sess::ParseSess;
 use syntax::util::map_in_place::MapInPlace;
+use syntax_pos::Span;
 use syntax_pos::symbol::sym;
 
 use smallvec::SmallVec;
@@ -72,6 +73,11 @@ macro_rules! configure {
     }
 }
 
+const CFG_ATTR_GRAMMAR_HELP: &str = "#[cfg_attr(condition, attribute, other_attribute, ...)]";
+const CFG_ATTR_NOTE_REF: &str = "for more information, visit \
+    <https://doc.rust-lang.org/reference/conditional-compilation.html\
+    #the-cfg_attr-attribute>";
+
 impl<'a> StripUnconfigured<'a> {
     pub fn configure<T: HasAttrs>(&mut self, mut node: T) -> Option<T> {
         self.process_cfg_attrs(&mut node);
@@ -97,34 +103,14 @@ impl<'a> StripUnconfigured<'a> {
     /// Gives a compiler warning when the `cfg_attr` contains no attributes and
     /// is in the original source file. Gives a compiler error if the syntax of
     /// the attribute is incorrect.
-    fn process_cfg_attr(&mut self, attr: ast::Attribute) -> Vec<ast::Attribute> {
+    fn process_cfg_attr(&mut self, attr: Attribute) -> Vec<Attribute> {
         if !attr.has_name(sym::cfg_attr) {
             return vec![attr];
         }
-        if let ast::MacArgs::Empty = attr.get_normal_item().args {
-            self.sess.span_diagnostic
-                .struct_span_err(
-                    attr.span,
-                    "malformed `cfg_attr` attribute input",
-                ).span_suggestion(
-                    attr.span,
-                    "missing condition and attribute",
-                    "#[cfg_attr(condition, attribute, other_attribute, ...)]".to_owned(),
-                    Applicability::HasPlaceholders,
-                ).note("for more information, visit \
-                       <https://doc.rust-lang.org/reference/conditional-compilation.html\
-                       #the-cfg_attr-attribute>")
-                .emit();
-            return vec![];
-        }
 
-        let res = crate::parse_in_attr(self.sess, &attr, |p| p.parse_cfg_attr());
-        let (cfg_predicate, expanded_attrs) = match res {
-            Ok(result) => result,
-            Err(mut e) => {
-                e.emit();
-                return vec![];
-            }
+        let (cfg_predicate, expanded_attrs) = match self.parse_cfg_attr(&attr) {
+            None => return vec![],
+            Some(r) => r,
         };
 
         // Lint on zero attributes in source.
@@ -135,24 +121,56 @@ impl<'a> StripUnconfigured<'a> {
         // At this point we know the attribute is considered used.
         attr::mark_used(&attr);
 
-        if attr::cfg_matches(&cfg_predicate, self.sess, self.features) {
-            // We call `process_cfg_attr` recursively in case there's a
-            // `cfg_attr` inside of another `cfg_attr`. E.g.
-            //  `#[cfg_attr(false, cfg_attr(true, some_attr))]`.
-            expanded_attrs.into_iter()
-            .flat_map(|(item, span)| self.process_cfg_attr(attr::mk_attr_from_item(
-                attr.style,
-                item,
-                span,
-            )))
+        if !attr::cfg_matches(&cfg_predicate, self.sess, self.features) {
+            return vec![];
+        }
+
+        // We call `process_cfg_attr` recursively in case there's a
+        // `cfg_attr` inside of another `cfg_attr`. E.g.
+        //  `#[cfg_attr(false, cfg_attr(true, some_attr))]`.
+        expanded_attrs
+            .into_iter()
+            .flat_map(|(item, span)| {
+                let attr = attr::mk_attr_from_item(attr.style, item, span);
+                self.process_cfg_attr(attr)
+            })
             .collect()
-        } else {
-            vec![]
+    }
+
+    fn parse_cfg_attr(&self, attr: &Attribute) -> Option<(MetaItem, Vec<(AttrItem, Span)>)> {
+        match attr.get_normal_item().args {
+            ast::MacArgs::Delimited(dspan, delim, ref tts) if !tts.is_empty() => {
+                let msg = "wrong `cfg_attr` delimiters";
+                validate_attr::check_meta_bad_delim(self.sess, dspan, delim, msg);
+                match parse_in(self.sess, tts.clone(), "`cfg_attr` input", |p| p.parse_cfg_attr()) {
+                    Ok(r) => return Some(r),
+                    Err(mut e) => e
+                        .help(&format!("the valid syntax is `{}`", CFG_ATTR_GRAMMAR_HELP))
+                        .note(CFG_ATTR_NOTE_REF)
+                        .emit(),
+                }
+            }
+            _ => self.error_malformed_cfg_attr_missing(attr.span),
         }
+        None
+    }
+
+    fn error_malformed_cfg_attr_missing(&self, span: Span) {
+        self.sess
+            .span_diagnostic
+            .struct_span_err(span, "malformed `cfg_attr` attribute input")
+            .span_suggestion(
+                span,
+                "missing condition and attribute",
+                CFG_ATTR_GRAMMAR_HELP.to_string(),
+                Applicability::HasPlaceholders,
+            )
+            .note(CFG_ATTR_NOTE_REF)
+            .emit();
     }
 
     /// Determines if a node with the given attributes should be included in this configuration.
-    pub fn in_cfg(&self, attrs: &[ast::Attribute]) -> bool {
+    pub fn in_cfg(&self, attrs: &[Attribute]) -> bool {
         attrs.iter().all(|attr| {
             if !is_cfg(attr) {
                 return true;
@@ -199,15 +217,15 @@ impl<'a> StripUnconfigured<'a> {
     }
 
     /// Visit attributes on expression and statements (but not attributes on items in blocks).
-    fn visit_expr_attrs(&mut self, attrs: &[ast::Attribute]) {
+    fn visit_expr_attrs(&mut self, attrs: &[Attribute]) {
         // flag the offending attributes
         for attr in attrs.iter() {
             self.maybe_emit_expr_attr_err(attr);
         }
     }
 
     /// If attributes are not allowed on expressions, emit an error for `attr`
-    pub fn maybe_emit_expr_attr_err(&self, attr: &ast::Attribute) {
+    pub fn maybe_emit_expr_attr_err(&self, attr: &Attribute) {
         if !self.features.map(|features| features.stmt_expr_attributes).unwrap_or(true) {
             let mut err = feature_err(self.sess,
                                       sym::stmt_expr_attributes,
@@ -350,7 +368,7 @@ impl<'a> MutVisitor for StripUnconfigured<'a> {
     }
 }
 
-fn is_cfg(attr: &ast::Attribute) -> bool {
+fn is_cfg(attr: &Attribute) -> bool {
     attr.check_name(sym::cfg)
 }
 
@@ -359,8 +377,8 @@ fn is_cfg(attr: &ast::Attribute) -> bool {
 pub fn process_configure_mod(
     sess: &ParseSess,
     cfg_mods: bool,
-    attrs: &[ast::Attribute],
-) -> (bool, Vec<ast::Attribute>) {
+    attrs: &[Attribute],
+) -> (bool, Vec<Attribute>) {
     // Don't perform gated feature checking.
     let mut strip_unconfigured = StripUnconfigured { sess, features: None };
     let mut attrs = attrs.to_owned();

src/librustc_parse/lib.rs

@@ -271,21 +271,13 @@ pub fn stream_to_parser_with_base_dir<'a>(
 }
 
 /// Runs the given subparser `f` on the tokens of the given `attr`'s item.
-pub fn parse_in_attr<'a, T>(
+pub fn parse_in<'a, T>(
     sess: &'a ParseSess,
-    attr: &ast::Attribute,
+    tts: TokenStream,
+    name: &'static str,
     mut f: impl FnMut(&mut Parser<'a>) -> PResult<'a, T>,
 ) -> PResult<'a, T> {
-    let mut parser = Parser::new(
-        sess,
-        // FIXME(#66940, Centril | petrochenkov): refactor this function so it doesn't
-        // require reconstructing and immediately re-parsing delimiters.
-        attr.get_normal_item().args.outer_tokens(),
-        None,
-        false,
-        false,
-        Some("attribute"),
-    );
+    let mut parser = Parser::new(sess, tts, None, false, false, Some(name));
     let result = f(&mut parser)?;
     if parser.token != token::Eof {
         parser.unexpected()?;

src/librustc_parse/parser/attr.rs

@@ -220,7 +220,7 @@ impl<'a> Parser<'a> {
         Ok(attrs)
     }
 
-    pub(super) fn parse_unsuffixed_lit(&mut self) -> PResult<'a, ast::Lit> {
+    crate fn parse_unsuffixed_lit(&mut self) -> PResult<'a, ast::Lit> {
         let lit = self.parse_lit()?;
         debug!("checking if {:?} is unusuffixed", lit);
 
@@ -238,25 +238,36 @@ impl<'a> Parser<'a> {
 
     /// Parses `cfg_attr(pred, attr_item_list)` where `attr_item_list` is comma-delimited.
     pub fn parse_cfg_attr(&mut self) -> PResult<'a, (ast::MetaItem, Vec<(ast::AttrItem, Span)>)> {
-        self.expect(&token::OpenDelim(token::Paren))?;
-
         let cfg_predicate = self.parse_meta_item()?;
         self.expect(&token::Comma)?;
 
         // Presumably, the majority of the time there will only be one attr.
         let mut expanded_attrs = Vec::with_capacity(1);
-
-        while !self.check(&token::CloseDelim(token::Paren)) {
-            let lo = self.token.span.lo();
+        while self.token.kind != token::Eof {
+            let lo = self.token.span;
             let item = self.parse_attr_item()?;
-            expanded_attrs.push((item, self.prev_span.with_lo(lo)));
-            self.expect_one_of(&[token::Comma], &[token::CloseDelim(token::Paren)])?;
+            expanded_attrs.push((item, lo.to(self.prev_span)));
+            if !self.eat(&token::Comma) {
+                break;
+            }
         }
 
-        self.expect(&token::CloseDelim(token::Paren))?;
         Ok((cfg_predicate, expanded_attrs))
     }
 
+    /// Matches `COMMASEP(meta_item_inner)`.
+    crate fn parse_meta_seq_top(&mut self) -> PResult<'a, Vec<ast::NestedMetaItem>> {
+        // Presumably, the majority of the time there will only be one attr.
+        let mut nmis = Vec::with_capacity(1);
+        while self.token.kind != token::Eof {
+            nmis.push(self.parse_meta_item_inner()?);
+            if !self.eat(&token::Comma) {
+                break;
+            }
+        }
+        Ok(nmis)
+    }
+
     /// Matches the following grammar (per RFC 1559).
     ///
     ///     meta_item : PATH ( '=' UNSUFFIXED_LIT | '(' meta_item_inner? ')' )? ;

src/librustc_parse/parser/path.rs

@@ -3,7 +3,6 @@ use crate::maybe_whole;
 use rustc_errors::{PResult, Applicability, pluralize};
 use syntax::ast::{self, QSelf, Path, PathSegment, Ident, ParenthesizedArgs, AngleBracketedArgs};
 use syntax::ast::{AnonConst, GenericArg, AssocTyConstraint, AssocTyConstraintKind, BlockCheckMode};
-use syntax::ast::MacArgs;
 use syntax::ThinVec;
 use syntax::token::{self, Token};
 use syntax_pos::source_map::{Span, BytePos};
@@ -109,42 +108,6 @@ impl<'a> Parser<'a> {
         Ok(Path { segments, span: lo.to(self.prev_span) })
     }
 
-    /// Like `parse_path`, but also supports parsing `Word` meta items into paths for
-    /// backwards-compatibility. This is used when parsing derive macro paths in `#[derive]`
-    /// attributes.
-    fn parse_path_allowing_meta(&mut self, style: PathStyle) -> PResult<'a, Path> {
-        let meta_ident = match self.token.kind {
-            token::Interpolated(ref nt) => match **nt {
-                token::NtMeta(ref item) => match item.args {
-                    MacArgs::Empty => Some(item.path.clone()),
-                    _ => None,
-                },
-                _ => None,
-            },
-            _ => None,
-        };
-        if let Some(path) = meta_ident {
-            self.bump();
-            return Ok(path);
-        }
-        self.parse_path(style)
-    }
-
-    /// Parse a list of paths inside `#[derive(path_0, ..., path_n)]`.
-    pub fn parse_derive_paths(&mut self) -> PResult<'a, Vec<Path>> {
-        self.expect(&token::OpenDelim(token::Paren))?;
-        let mut list = Vec::new();
-        while !self.eat(&token::CloseDelim(token::Paren)) {
-            let path = self.parse_path_allowing_meta(PathStyle::Mod)?;
-            list.push(path);
-            if !self.eat(&token::Comma) {
-                self.expect(&token::CloseDelim(token::Paren))?;
-                break
-            }
-        }
-        Ok(list)
-    }
-
     pub(super) fn parse_path_segments(
         &mut self,
         segments: &mut Vec<PathSegment>,

src/librustc_parse/validate_attr.rs

@@ -1,10 +1,13 @@
 //! Meta-syntax validation logic of attributes for post-expansion.
 
+use crate::parse_in;
+
 use rustc_errors::{PResult, Applicability};
 use rustc_feature::{AttributeTemplate, BUILTIN_ATTRIBUTE_MAP};
-use syntax::ast::{self, Attribute, AttrKind, Ident, MacArgs, MetaItem, MetaItemKind};
+use syntax::ast::{self, Attribute, AttrKind, Ident, MacArgs, MacDelimiter, MetaItem, MetaItemKind};
 use syntax::attr::mk_name_value_item_str;
 use syntax::early_buffered_lints::ILL_FORMED_ATTRIBUTE_INPUT;
+use syntax::tokenstream::DelimSpan;
 use syntax::sess::ParseSess;
 use syntax_pos::{Symbol, sym};
 
@@ -27,16 +30,45 @@ pub fn check_meta(sess: &ParseSess, attr: &Attribute) {
 pub fn parse_meta<'a>(sess: &'a ParseSess, attr: &Attribute) -> PResult<'a, MetaItem> {
     Ok(match attr.kind {
         AttrKind::Normal(ref item) => MetaItem {
-            path: item.path.clone(),
-            kind: super::parse_in_attr(sess, attr, |p| p.parse_meta_item_kind())?,
             span: attr.span,
+            path: item.path.clone(),
+            kind: match &attr.get_normal_item().args {
+                MacArgs::Empty => MetaItemKind::Word,
+                MacArgs::Eq(_, t) => {
+                    let v = parse_in(sess, t.clone(), "name value", |p| p.parse_unsuffixed_lit())?;
+                    MetaItemKind::NameValue(v)
+                }
+                MacArgs::Delimited(dspan, delim, t) => {
+                    check_meta_bad_delim(sess, *dspan, *delim, "wrong meta list delimiters");
+                    let nmis = parse_in(sess, t.clone(), "meta list", |p| p.parse_meta_seq_top())?;
+                    MetaItemKind::List(nmis)
+                }
+            }
         },
         AttrKind::DocComment(comment) => {
             mk_name_value_item_str(Ident::new(sym::doc, attr.span), comment, attr.span)
         }
     })
 }
 
+crate fn check_meta_bad_delim(sess: &ParseSess, span: DelimSpan, delim: MacDelimiter, msg: &str) {
+    if let ast::MacDelimiter::Parenthesis = delim {
+        return;
+    }
+
+    sess.span_diagnostic
+        .struct_span_err(span.entire(), msg)
+        .multipart_suggestion(
+            "the delimiters should be `(` and `)`",
+            vec![
+                (span.open, "(".to_string()),
+                (span.close, ")".to_string()),
+            ],
+            Applicability::MachineApplicable,
+        )
+        .emit();
+}
+
 /// Checks that the given meta-item is compatible with this `AttributeTemplate`.
 fn is_attr_template_compatible(template: &AttributeTemplate, meta: &ast::MetaItemKind) -> bool {
     match meta {