resolve: Legacy(Scope,Binding) -> MacroRules(Scope,Binding)

Author: petrochenkov

src/librustc_resolve/build_reduced_graph.rs

@@ -7,7 +7,7 @@
 
 use crate::def_collector::collect_definitions;
 use crate::imports::{Import, ImportKind};
-use crate::macros::{LegacyBinding, LegacyScope};
+use crate::macros::{MacroRulesBinding, MacroRulesScope};
 use crate::Namespace::{self, MacroNS, TypeNS, ValueNS};
 use crate::{CrateLint, Determinacy, PathResult, ResolutionError, VisResolutionError};
 use crate::{
@@ -165,11 +165,11 @@ impl<'a> Resolver<'a> {
         &mut self,
         fragment: &AstFragment,
         parent_scope: ParentScope<'a>,
-    ) -> LegacyScope<'a> {
+    ) -> MacroRulesScope<'a> {
         collect_definitions(&mut self.definitions, fragment, parent_scope.expansion);
         let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope };
         fragment.visit_with(&mut visitor);
-        visitor.parent_scope.legacy
+        visitor.parent_scope.macro_rules
     }
 
     crate fn build_reduced_graph_external(&mut self, module: Module<'a>) {
@@ -1060,15 +1060,15 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
         false
     }
 
-    fn visit_invoc(&mut self, id: NodeId) -> LegacyScope<'a> {
+    fn visit_invoc(&mut self, id: NodeId) -> MacroRulesScope<'a> {
         let invoc_id = id.placeholder_to_expn_id();
 
         self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id);
 
         let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope);
         assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation");
 
-        LegacyScope::Invocation(invoc_id)
+        MacroRulesScope::Invocation(invoc_id)
     }
 
     fn proc_macro_stub(item: &ast::Item) -> Option<(MacroKind, Ident, Span)> {
@@ -1095,7 +1095,7 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
         }
     }
 
-    fn define_macro(&mut self, item: &ast::Item) -> LegacyScope<'a> {
+    fn define_macro(&mut self, item: &ast::Item) -> MacroRulesScope<'a> {
         let parent_scope = self.parent_scope;
         let expansion = parent_scope.expansion;
         let (ext, ident, span, macro_rules) = match &item.kind {
@@ -1108,7 +1108,7 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
                     self.r.proc_macro_stubs.insert(item.id);
                     (self.r.dummy_ext(macro_kind), ident, span, false)
                 }
-                None => return parent_scope.legacy,
+                None => return parent_scope.macro_rules,
             },
             _ => unreachable!(),
         };
@@ -1137,8 +1137,8 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
                 self.r.check_reserved_macro_name(ident, res);
                 self.insert_unused_macro(ident, item.id, span);
             }
-            LegacyScope::Binding(self.r.arenas.alloc_legacy_binding(LegacyBinding {
-                parent_legacy_scope: parent_scope.legacy,
+            MacroRulesScope::Binding(self.r.arenas.alloc_macro_rules_binding(MacroRulesBinding {
+                parent_macro_rules_scope: parent_scope.macro_rules,
                 binding,
                 ident,
             }))
@@ -1149,7 +1149,7 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
                 self.insert_unused_macro(ident, item.id, span);
             }
             self.r.define(module, ident, MacroNS, (res, vis, span, expansion));
-            self.parent_scope.legacy
+            self.parent_scope.macro_rules
         }
     }
 }
@@ -1174,29 +1174,29 @@ impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> {
     fn visit_item(&mut self, item: &'b Item) {
         let macro_use = match item.kind {
             ItemKind::MacroDef(..) => {
-                self.parent_scope.legacy = self.define_macro(item);
+                self.parent_scope.macro_rules = self.define_macro(item);
                 return;
             }
             ItemKind::MacCall(..) => {
-                self.parent_scope.legacy = self.visit_invoc(item.id);
+                self.parent_scope.macro_rules = self.visit_invoc(item.id);
                 return;
             }
             ItemKind::Mod(..) => self.contains_macro_use(&item.attrs),
             _ => false,
         };
         let orig_current_module = self.parent_scope.module;
-        let orig_current_legacy_scope = self.parent_scope.legacy;
+        let orig_current_macro_rules_scope = self.parent_scope.macro_rules;
         self.build_reduced_graph_for_item(item);
         visit::walk_item(self, item);
         self.parent_scope.module = orig_current_module;
         if !macro_use {
-            self.parent_scope.legacy = orig_current_legacy_scope;
+            self.parent_scope.macro_rules = orig_current_macro_rules_scope;
         }
     }
 
     fn visit_stmt(&mut self, stmt: &'b ast::Stmt) {
         if let ast::StmtKind::MacCall(..) = stmt.kind {
-            self.parent_scope.legacy = self.visit_invoc(stmt.id);
+            self.parent_scope.macro_rules = self.visit_invoc(stmt.id);
         } else {
             visit::walk_stmt(self, stmt);
         }
@@ -1214,11 +1214,11 @@ impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> {
 
     fn visit_block(&mut self, block: &'b Block) {
         let orig_current_module = self.parent_scope.module;
-        let orig_current_legacy_scope = self.parent_scope.legacy;
+        let orig_current_macro_rules_scope = self.parent_scope.macro_rules;
         self.build_reduced_graph_for_block(block);
         visit::walk_block(self, block);
         self.parent_scope.module = orig_current_module;
-        self.parent_scope.legacy = orig_current_legacy_scope;
+        self.parent_scope.macro_rules = orig_current_macro_rules_scope;
     }
 
     fn visit_assoc_item(&mut self, item: &'b AssocItem, ctxt: AssocCtxt) {

src/librustc_resolve/diagnostics.rs

@@ -21,7 +21,9 @@ use rustc_span::{BytePos, MultiSpan, Span};
 use crate::imports::{Import, ImportKind, ImportResolver};
 use crate::path_names_to_string;
 use crate::{AmbiguityError, AmbiguityErrorMisc, AmbiguityKind};
-use crate::{BindingError, CrateLint, HasGenericParams, LegacyScope, Module, ModuleOrUniformRoot};
+use crate::{
+    BindingError, CrateLint, HasGenericParams, MacroRulesScope, Module, ModuleOrUniformRoot,
+};
 use crate::{NameBinding, NameBindingKind, PrivacyError, VisResolutionError};
 use crate::{ParentScope, PathResult, ResolutionError, Resolver, Scope, ScopeSet, Segment};
 
@@ -498,12 +500,12 @@ impl<'a> Resolver<'a> {
                         }
                     }
                 }
-                Scope::MacroRules(legacy_scope) => {
-                    if let LegacyScope::Binding(legacy_binding) = legacy_scope {
-                        let res = legacy_binding.binding.res();
+                Scope::MacroRules(macro_rules_scope) => {
+                    if let MacroRulesScope::Binding(macro_rules_binding) = macro_rules_scope {
+                        let res = macro_rules_binding.binding.res();
                         if filter_fn(res) {
                             suggestions
-                                .push(TypoSuggestion::from_res(legacy_binding.ident.name, res))
+                                .push(TypoSuggestion::from_res(macro_rules_binding.ident.name, res))
                         }
                     }
                 }

src/librustc_resolve/lib.rs

@@ -58,7 +58,7 @@ use diagnostics::{extend_span_to_previous_binding, find_span_of_binding_until_ne
 use diagnostics::{ImportSuggestion, Suggestion};
 use imports::{Import, ImportKind, ImportResolver, NameResolution};
 use late::{HasGenericParams, PathSource, Rib, RibKind::*};
-use macros::{LegacyBinding, LegacyScope};
+use macros::{MacroRulesBinding, MacroRulesScope};
 
 type Res = def::Res<NodeId>;
 
@@ -94,7 +94,7 @@ impl Determinacy {
 enum Scope<'a> {
     DeriveHelpers(ExpnId),
     DeriveHelpersCompat,
-    MacroRules(LegacyScope<'a>),
+    MacroRules(MacroRulesScope<'a>),
     CrateRoot,
     Module(Module<'a>),
     RegisteredAttrs,
@@ -127,15 +127,20 @@ enum ScopeSet {
 pub struct ParentScope<'a> {
     module: Module<'a>,
     expansion: ExpnId,
-    legacy: LegacyScope<'a>,
+    macro_rules: MacroRulesScope<'a>,
     derives: &'a [ast::Path],
 }
 
 impl<'a> ParentScope<'a> {
     /// Creates a parent scope with the passed argument used as the module scope component,
     /// and other scope components set to default empty values.
     pub fn module(module: Module<'a>) -> ParentScope<'a> {
-        ParentScope { module, expansion: ExpnId::root(), legacy: LegacyScope::Empty, derives: &[] }
+        ParentScope {
+            module,
+            expansion: ExpnId::root(),
+            macro_rules: MacroRulesScope::Empty,
+            derives: &[],
+        }
     }
 }
 
@@ -930,9 +935,9 @@ pub struct Resolver<'a> {
     /// Parent scopes in which the macros were invoked.
     /// FIXME: `derives` are missing in these parent scopes and need to be taken from elsewhere.
     invocation_parent_scopes: FxHashMap<ExpnId, ParentScope<'a>>,
-    /// Legacy scopes *produced* by expanding the macro invocations,
+    /// `macro_rules` scopes *produced* by expanding the macro invocations,
     /// include all the `macro_rules` items and other invocations generated by them.
-    output_legacy_scopes: FxHashMap<ExpnId, LegacyScope<'a>>,
+    output_macro_rules_scopes: FxHashMap<ExpnId, MacroRulesScope<'a>>,
     /// Helper attributes that are in scope for the given expansion.
     helper_attrs: FxHashMap<ExpnId, Vec<Ident>>,
 
@@ -965,7 +970,7 @@ pub struct ResolverArenas<'a> {
     name_bindings: arena::TypedArena<NameBinding<'a>>,
     imports: arena::TypedArena<Import<'a>>,
     name_resolutions: arena::TypedArena<RefCell<NameResolution<'a>>>,
-    legacy_bindings: arena::TypedArena<LegacyBinding<'a>>,
+    macro_rules_bindings: arena::TypedArena<MacroRulesBinding<'a>>,
     ast_paths: arena::TypedArena<ast::Path>,
 }
 
@@ -989,8 +994,11 @@ impl<'a> ResolverArenas<'a> {
     fn alloc_name_resolution(&'a self) -> &'a RefCell<NameResolution<'a>> {
         self.name_resolutions.alloc(Default::default())
     }
-    fn alloc_legacy_binding(&'a self, binding: LegacyBinding<'a>) -> &'a LegacyBinding<'a> {
-        self.legacy_bindings.alloc(binding)
+    fn alloc_macro_rules_binding(
+        &'a self,
+        binding: MacroRulesBinding<'a>,
+    ) -> &'a MacroRulesBinding<'a> {
+        self.macro_rules_bindings.alloc(binding)
     }
     fn alloc_ast_paths(&'a self, paths: &[ast::Path]) -> &'a [ast::Path] {
         self.ast_paths.alloc_from_iter(paths.iter().cloned())
@@ -1210,7 +1218,7 @@ impl<'a> Resolver<'a> {
             dummy_ext_derive: Lrc::new(SyntaxExtension::dummy_derive(session.edition())),
             non_macro_attrs: [non_macro_attr(false), non_macro_attr(true)],
             invocation_parent_scopes,
-            output_legacy_scopes: Default::default(),
+            output_macro_rules_scopes: Default::default(),
             helper_attrs: Default::default(),
             macro_defs,
             local_macro_def_scopes: FxHashMap::default(),
@@ -1530,16 +1538,18 @@ impl<'a> Resolver<'a> {
                     }
                 }
                 Scope::DeriveHelpers(..) => Scope::DeriveHelpersCompat,
-                Scope::DeriveHelpersCompat => Scope::MacroRules(parent_scope.legacy),
-                Scope::MacroRules(legacy_scope) => match legacy_scope {
-                    LegacyScope::Binding(binding) => Scope::MacroRules(binding.parent_legacy_scope),
-                    LegacyScope::Invocation(invoc_id) => Scope::MacroRules(
-                        self.output_legacy_scopes
+                Scope::DeriveHelpersCompat => Scope::MacroRules(parent_scope.macro_rules),
+                Scope::MacroRules(macro_rules_scope) => match macro_rules_scope {
+                    MacroRulesScope::Binding(binding) => {
+                        Scope::MacroRules(binding.parent_macro_rules_scope)
+                    }
+                    MacroRulesScope::Invocation(invoc_id) => Scope::MacroRules(
+                        self.output_macro_rules_scopes
                             .get(&invoc_id)
                             .cloned()
-                            .unwrap_or(self.invocation_parent_scopes[&invoc_id].legacy),
+                            .unwrap_or(self.invocation_parent_scopes[&invoc_id].macro_rules),
                     ),
-                    LegacyScope::Empty => Scope::Module(module),
+                    MacroRulesScope::Empty => Scope::Module(module),
                 },
                 Scope::CrateRoot => match ns {
                     TypeNS => {

src/librustc_resolve/macros.rs

@@ -33,26 +33,26 @@ use std::{mem, ptr};
 type Res = def::Res<NodeId>;
 
 /// Binding produced by a `macro_rules` item.
-/// Not modularized, can shadow previous legacy bindings, etc.
+/// Not modularized, can shadow previous `macro_rules` bindings, etc.
 #[derive(Debug)]
-pub struct LegacyBinding<'a> {
+pub struct MacroRulesBinding<'a> {
     crate binding: &'a NameBinding<'a>,
-    /// Legacy scope into which the `macro_rules` item was planted.
-    crate parent_legacy_scope: LegacyScope<'a>,
+    /// `macro_rules` scope into which the `macro_rules` item was planted.
+    crate parent_macro_rules_scope: MacroRulesScope<'a>,
     crate ident: Ident,
 }
 
 /// The scope introduced by a `macro_rules!` macro.
 /// This starts at the macro's definition and ends at the end of the macro's parent
 /// module (named or unnamed), or even further if it escapes with `#[macro_use]`.
-/// Some macro invocations need to introduce legacy scopes too because they
+/// Some macro invocations need to introduce `macro_rules` scopes too because they
 /// can potentially expand into macro definitions.
 #[derive(Copy, Clone, Debug)]
-pub enum LegacyScope<'a> {
+pub enum MacroRulesScope<'a> {
     /// Empty "root" scope at the crate start containing no names.
     Empty,
     /// The scope introduced by a `macro_rules!` macro definition.
-    Binding(&'a LegacyBinding<'a>),
+    Binding(&'a MacroRulesBinding<'a>),
     /// The scope introduced by a macro invocation that can potentially
     /// create a `macro_rules!` macro definition.
     Invocation(ExpnId),
@@ -159,8 +159,8 @@ impl<'a> base::Resolver for Resolver<'a> {
         // Integrate the new AST fragment into all the definition and module structures.
         // We are inside the `expansion` now, but other parent scope components are still the same.
         let parent_scope = ParentScope { expansion, ..self.invocation_parent_scopes[&expansion] };
-        let output_legacy_scope = self.build_reduced_graph(fragment, parent_scope);
-        self.output_legacy_scopes.insert(expansion, output_legacy_scope);
+        let output_macro_rules_scope = self.build_reduced_graph(fragment, parent_scope);
+        self.output_macro_rules_scopes.insert(expansion, output_macro_rules_scope);
 
         parent_scope.module.unexpanded_invocations.borrow_mut().remove(&expansion);
     }
@@ -608,12 +608,14 @@ impl<'a> Resolver<'a> {
                         }
                         result
                     }
-                    Scope::MacroRules(legacy_scope) => match legacy_scope {
-                        LegacyScope::Binding(legacy_binding) if ident == legacy_binding.ident => {
-                            Ok((legacy_binding.binding, Flags::MACRO_RULES))
+                    Scope::MacroRules(macro_rules_scope) => match macro_rules_scope {
+                        MacroRulesScope::Binding(macro_rules_binding)
+                            if ident == macro_rules_binding.ident =>
+                        {
+                            Ok((macro_rules_binding.binding, Flags::MACRO_RULES))
                         }
-                        LegacyScope::Invocation(invoc_id)
-                            if !this.output_legacy_scopes.contains_key(&invoc_id) =>
+                        MacroRulesScope::Invocation(invoc_id)
+                            if !this.output_macro_rules_scopes.contains_key(&invoc_id) =>
                         {
                             Err(Determinacy::Undetermined)
                         }