move is_builtin_attr to syntax::attr

src/librustc_passes/ast_validation.rs

@@ -14,7 +14,6 @@ use rustc_parse::validate_attr;
 use syntax::ast::*;
 use syntax::attr;
 use syntax::expand::is_proc_macro_attr;
-use syntax::feature_gate::is_builtin_attr;
 use syntax::print::pprust;
 use syntax::source_map::Spanned;
 use syntax::symbol::{kw, sym};
@@ -257,7 +256,7 @@ impl<'a> AstValidator<'a> {
             .flat_map(|i| i.attrs.as_ref())
             .filter(|attr| {
                 let arr = [sym::allow, sym::cfg, sym::cfg_attr, sym::deny, sym::forbid, sym::warn];
-                !arr.contains(&attr.name_or_empty()) && is_builtin_attr(attr)
+                !arr.contains(&attr.name_or_empty()) && attr::is_builtin_attr(attr)
             })
             .for_each(|attr| if attr.is_doc_comment() {
                 let mut err = self.err_handler().struct_span_err(

src/librustc_resolve/build_reduced_graph.rs

@@ -29,10 +29,8 @@ use errors::Applicability;
 
 use syntax::ast::{Name, Ident};
 use syntax::attr;
-
 use syntax::ast::{self, Block, ForeignItem, ForeignItemKind, Item, ItemKind, NodeId};
 use syntax::ast::{MetaItemKind, StmtKind, TraitItem, TraitItemKind};
-use syntax::feature_gate::is_builtin_attr;
 use syntax::token::{self, Token};
 use syntax::print::pprust;
 use syntax::{span_err, struct_span_err};
@@ -1231,7 +1229,7 @@ impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> {
     }
 
     fn visit_attribute(&mut self, attr: &'b ast::Attribute) {
-        if !attr.is_doc_comment() && is_builtin_attr(attr) {
+        if !attr.is_doc_comment() && attr::is_builtin_attr(attr) {
             self.r.builtin_attrs.push(
                 (attr.get_normal_item().path.segments[0].ident, self.parent_scope)
             );

src/libsyntax/attr/builtin.rs

@@ -2,6 +2,7 @@
 
 use crate::ast::{self, Attribute, MetaItem, NestedMetaItem};
 use crate::feature_gate::{find_gated_cfg, emit_feature_err, GatedCfg, GateIssue};
+use crate::feature_gate::is_builtin_attr_name;
 use crate::print::pprust;
 use crate::sess::ParseSess;
 
@@ -10,12 +11,17 @@ use std::num::NonZeroU32;
 use syntax_pos::hygiene::Transparency;
 use syntax_pos::{symbol::Symbol, symbol::sym, Span};
 use rustc_feature::Features;
+
 use rustc_macros::HashStable_Generic;
 
 use super::{mark_used, MetaItemKind};
 
 use rustc_error_codes::*;
 
+pub fn is_builtin_attr(attr: &Attribute) -> bool {
+    attr.ident().filter(|ident| is_builtin_attr_name(ident.name)).is_some()
+}
+
 enum AttrError {
     MultipleItem(String),
     UnknownMetaItem(String, &'static [&'static str]),

src/libsyntax/feature_gate/builtin_attrs.rs

@@ -3,12 +3,9 @@
 use AttributeType::*;
 use AttributeGate::*;
 
+use rustc_data_structures::fx::FxHashMap;
 use rustc_feature::{Features, Stability};
-
-use crate::ast;
-
 use syntax_pos::symbol::{Symbol, sym};
-use rustc_data_structures::fx::FxHashMap;
 use lazy_static::lazy_static;
 
 type GateFn = fn(&Features) -> bool;
@@ -580,14 +577,10 @@ pub fn deprecated_attributes() -> Vec<&'static BuiltinAttribute> {
     BUILTIN_ATTRIBUTES.iter().filter(|(.., gate)| gate.is_deprecated()).collect()
 }
 
-pub fn is_builtin_attr_name(name: ast::Name) -> bool {
+pub fn is_builtin_attr_name(name: Symbol) -> bool {
     BUILTIN_ATTRIBUTE_MAP.get(&name).is_some()
 }
 
-pub fn is_builtin_attr(attr: &ast::Attribute) -> bool {
-    attr.ident().and_then(|ident| BUILTIN_ATTRIBUTE_MAP.get(&ident.name)).is_some()
-}
-
 lazy_static! {
     pub static ref BUILTIN_ATTRIBUTE_MAP: FxHashMap<Symbol, &'static BuiltinAttribute> = {
         let mut map = FxHashMap::default();

src/libsyntax/lib.rs

@@ -103,7 +103,7 @@ pub mod feature_gate {
     pub use builtin_attrs::{
         AttributeGate, AttributeTemplate, AttributeType, find_gated_cfg, GatedCfg,
         BuiltinAttribute, BUILTIN_ATTRIBUTES, BUILTIN_ATTRIBUTE_MAP,
-        deprecated_attributes, is_builtin_attr,  is_builtin_attr_name,
+        deprecated_attributes, is_builtin_attr_name,
     };
 }
 pub mod mut_visit;

src/libsyntax_expand/expand.rs

@@ -12,9 +12,9 @@ use rustc_parse::parser::Parser;
 use rustc_parse::validate_attr;
 use syntax::ast::{self, AttrItem, Block, Ident, LitKind, NodeId, PatKind, Path};
 use syntax::ast::{MacStmtStyle, StmtKind, ItemKind};
-use syntax::attr::{self, HasAttrs};
+use syntax::attr::{self, HasAttrs, is_builtin_attr};
 use syntax::source_map::respan;
-use syntax::feature_gate::{self, GateIssue, is_builtin_attr, emit_feature_err};
+use syntax::feature_gate::{self, GateIssue, emit_feature_err};
 use syntax::mut_visit::*;
 use syntax::print::pprust;
 use syntax::ptr::P;