rustc: Move features from Session to GlobalCtxt

Removes two pieces of mutable state.
Follow up to #114622.

compiler/rustc_expand/src/base.rs

@@ -18,6 +18,7 @@ use rustc_errors::{
     Applicability, DiagnosticBuilder, DiagnosticMessage, ErrorGuaranteed, IntoDiagnostic,
     MultiSpan, PResult,
 };
+use rustc_feature::Features;
 use rustc_lint_defs::builtin::PROC_MACRO_BACK_COMPAT;
 use rustc_lint_defs::{BufferedEarlyLint, BuiltinLintDiagnostics, RegisteredTools};
 use rustc_parse::{self, parser, MACRO_ARGUMENTS};
@@ -767,6 +768,7 @@ impl SyntaxExtension {
     /// and other properties converted from attributes.
     pub fn new(
         sess: &Session,
+        features: &Features,
         kind: SyntaxExtensionKind,
         span: Span,
         helper_attrs: Vec<Symbol>,
@@ -816,7 +818,7 @@ impl SyntaxExtension {
             allow_internal_unstable: (!allow_internal_unstable.is_empty())
                 .then(|| allow_internal_unstable.into()),
             stability: stability.map(|(s, _)| s),
-            deprecation: attr::find_deprecation(&sess, attrs).map(|(d, _)| d),
+            deprecation: attr::find_deprecation(&sess, features, attrs).map(|(d, _)| d),
             helper_attrs,
             edition,
             builtin_name,
@@ -957,6 +959,7 @@ pub trait LintStoreExpand {
     fn pre_expansion_lint(
         &self,
         sess: &Session,
+        features: &Features,
         registered_tools: &RegisteredTools,
         node_id: NodeId,
         attrs: &[Attribute],

compiler/rustc_expand/src/expand.rs

@@ -796,7 +796,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
             | Annotatable::FieldDef(..)
             | Annotatable::Variant(..) => panic!("unexpected annotatable"),
         };
-        if self.cx.ecfg.proc_macro_hygiene() {
+        if self.cx.ecfg.features.proc_macro_hygiene {
             return;
         }
         feature_err(
@@ -834,7 +834,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
             }
         }
 
-        if !self.cx.ecfg.proc_macro_hygiene() {
+        if !self.cx.ecfg.features.proc_macro_hygiene {
             annotatable
                 .visit_with(&mut GateProcMacroInput { parse_sess: &self.cx.sess.parse_sess });
         }
@@ -1122,6 +1122,7 @@ impl InvocationCollectorNode for P<ast::Item> {
                 if let Some(lint_store) = ecx.lint_store {
                     lint_store.pre_expansion_lint(
                         ecx.sess,
+                        ecx.ecfg.features,
                         ecx.resolver.registered_tools(),
                         ecx.current_expansion.lint_node_id,
                         &attrs,
@@ -1580,7 +1581,7 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
     fn cfg(&self) -> StripUnconfigured<'_> {
         StripUnconfigured {
             sess: &self.cx.sess,
-            features: self.cx.ecfg.features,
+            features: Some(self.cx.ecfg.features),
             config_tokens: false,
             lint_node_id: self.cx.current_expansion.lint_node_id,
         }
@@ -1676,7 +1677,7 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
     // Detect use of feature-gated or invalid attributes on macro invocations
     // since they will not be detected after macro expansion.
     fn check_attributes(&self, attrs: &[ast::Attribute], call: &ast::MacCall) {
-        let features = self.cx.ecfg.features.unwrap();
+        let features = self.cx.ecfg.features;
         let mut attrs = attrs.iter().peekable();
         let mut span: Option<Span> = None;
         while let Some(attr) = attrs.next() {
@@ -1976,7 +1977,7 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
 
 pub struct ExpansionConfig<'feat> {
     pub crate_name: String,
-    pub features: Option<&'feat Features>,
+    pub features: &'feat Features,
     pub recursion_limit: Limit,
     pub trace_mac: bool,
     /// If false, strip `#[test]` nodes
@@ -1987,11 +1988,11 @@ pub struct ExpansionConfig<'feat> {
     pub proc_macro_backtrace: bool,
 }
 
-impl<'feat> ExpansionConfig<'feat> {
-    pub fn default(crate_name: String) -> ExpansionConfig<'static> {
+impl ExpansionConfig<'_> {
+    pub fn default(crate_name: String, features: &Features) -> ExpansionConfig<'_> {
         ExpansionConfig {
             crate_name,
-            features: None,
+            features,
             recursion_limit: Limit::new(1024),
             trace_mac: false,
             should_test: false,
@@ -1999,8 +2000,4 @@ impl<'feat> ExpansionConfig<'feat> {
             proc_macro_backtrace: false,
         }
     }
-
-    fn proc_macro_hygiene(&self) -> bool {
-        self.features.is_some_and(|features| features.proc_macro_hygiene)
-    }
 }

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -16,6 +16,7 @@ use rustc_ast_pretty::pprust;
 use rustc_attr::{self as attr, TransparencyError};
 use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
 use rustc_errors::{Applicability, ErrorGuaranteed};
+use rustc_feature::Features;
 use rustc_lint_defs::builtin::{
     RUST_2021_INCOMPATIBLE_OR_PATTERNS, SEMICOLON_IN_EXPRESSIONS_FROM_MACROS,
 };
@@ -375,6 +376,7 @@ pub(super) fn try_match_macro<'matcher, T: Tracker<'matcher>>(
 /// Converts a macro item into a syntax extension.
 pub fn compile_declarative_macro(
     sess: &Session,
+    features: &Features,
     def: &ast::Item,
     edition: Edition,
 ) -> (SyntaxExtension, Vec<(usize, Span)>) {
@@ -382,6 +384,7 @@ pub fn compile_declarative_macro(
     let mk_syn_ext = |expander| {
         SyntaxExtension::new(
             sess,
+            features,
             SyntaxExtensionKind::LegacyBang(expander),
             def.span,
             Vec::new(),
@@ -503,7 +506,7 @@ pub fn compile_declarative_macro(
                         true,
                         &sess.parse_sess,
                         def.id,
-                        sess.features_untracked(),
+                        features,
                         edition,
                     )
                     .pop()
@@ -527,7 +530,7 @@ pub fn compile_declarative_macro(
                         false,
                         &sess.parse_sess,
                         def.id,
-                        sess.features_untracked(),
+                        features,
                         edition,
                     )
                     .pop()