| //! After we obtain a fresh AST fragment from a macro, code in this module helps to integrate |
| //! that fragment into the module structures that are already partially built. |
| //! |
| //! Items from the fragment are placed into modules, |
| //! unexpanded macros in the fragment are visited and registered. |
| //! Imports are also considered items and placed into modules here, but not resolved yet. |
| |
| use crate::def_collector::collect_definitions; |
| use crate::imports::{Import, ImportKind}; |
| use crate::macros::{MacroRulesBinding, MacroRulesScope, MacroRulesScopeRef}; |
| use crate::Namespace::{self, MacroNS, TypeNS, ValueNS}; |
| use crate::{Determinacy, ExternPreludeEntry, Finalize, Module, ModuleKind, ModuleOrUniformRoot}; |
| use crate::{NameBinding, NameBindingKind, ParentScope, PathResult, PerNS, ResolutionError}; |
| use crate::{Resolver, ResolverArenas, Segment, ToNameBinding, VisResolutionError}; |
| |
| use rustc_ast::visit::{self, AssocCtxt, Visitor}; |
| use rustc_ast::{self as ast, AssocItem, AssocItemKind, MetaItemKind, StmtKind}; |
| use rustc_ast::{Block, Fn, ForeignItem, ForeignItemKind, Impl, Item, ItemKind, NodeId}; |
| use rustc_ast_lowering::ResolverAstLowering; |
| use rustc_attr as attr; |
| use rustc_data_structures::sync::Lrc; |
| use rustc_errors::{struct_span_err, Applicability}; |
| use rustc_expand::base::SyntaxExtension; |
| use rustc_expand::expand::AstFragment; |
| use rustc_hir::def::{self, *}; |
| use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID}; |
| use rustc_metadata::creader::LoadedMacro; |
| use rustc_middle::bug; |
| use rustc_middle::metadata::ModChild; |
| use rustc_middle::ty; |
| use rustc_session::cstore::CrateStore; |
| use rustc_span::hygiene::{ExpnId, LocalExpnId, MacroKind}; |
| use rustc_span::source_map::{respan, Spanned}; |
| use rustc_span::symbol::{kw, sym, Ident, Symbol}; |
| use rustc_span::Span; |
| |
| use std::cell::Cell; |
| use std::ptr; |
| use tracing::debug; |
| |
| type Res = def::Res<NodeId>; |
| |
| impl<'a> ToNameBinding<'a> for (Module<'a>, ty::Visibility, Span, LocalExpnId) { |
| fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
| arenas.alloc_name_binding(NameBinding { |
| kind: NameBindingKind::Module(self.0), |
| ambiguity: None, |
| vis: self.1, |
| span: self.2, |
| expansion: self.3, |
| }) |
| } |
| } |
| |
| impl<'a> ToNameBinding<'a> for (Res, ty::Visibility, Span, LocalExpnId) { |
| fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
| arenas.alloc_name_binding(NameBinding { |
| kind: NameBindingKind::Res(self.0, false), |
| ambiguity: None, |
| vis: self.1, |
| span: self.2, |
| expansion: self.3, |
| }) |
| } |
| } |
| |
| struct IsMacroExport; |
| |
| impl<'a> ToNameBinding<'a> for (Res, ty::Visibility, Span, LocalExpnId, IsMacroExport) { |
| fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
| arenas.alloc_name_binding(NameBinding { |
| kind: NameBindingKind::Res(self.0, true), |
| ambiguity: None, |
| vis: self.1, |
| span: self.2, |
| expansion: self.3, |
| }) |
| } |
| } |
| |
| impl<'a> Resolver<'a> { |
| /// Defines `name` in namespace `ns` of module `parent` to be `def` if it is not yet defined; |
| /// otherwise, reports an error. |
| crate fn define<T>(&mut self, parent: Module<'a>, ident: Ident, ns: Namespace, def: T) |
| where |
| T: ToNameBinding<'a>, |
| { |
| let binding = def.to_name_binding(self.arenas); |
| let key = self.new_key(ident, ns); |
| if let Err(old_binding) = self.try_define(parent, key, binding) { |
| self.report_conflict(parent, ident, ns, old_binding, &binding); |
| } |
| } |
| |
| /// Walks up the tree of definitions starting at `def_id`, |
| /// stopping at the first encountered module. |
| /// Parent block modules for arbitrary def-ids are not recorded for the local crate, |
| /// and are not preserved in metadata for foreign crates, so block modules are never |
| /// returned by this function. |
| /// |
| /// For the local crate ignoring block modules may be incorrect, so use this method with care. |
| /// |
| /// For foreign crates block modules can be ignored without introducing observable differences, |
| /// moreover they has to be ignored right now because they are not kept in metadata. |
| /// Foreign parent modules are used for resolving names used by foreign macros with def-site |
| /// hygiene, therefore block module ignorability relies on macros with def-site hygiene and |
| /// block module parents being unreachable from other crates. |
| /// Reachable macros with block module parents exist due to `#[macro_export] macro_rules!`, |
| /// but they cannot use def-site hygiene, so the assumption holds |
| /// (<https://github.com/rust-lang/rust/pull/77984#issuecomment-712445508>). |
| pub fn get_nearest_non_block_module(&mut self, mut def_id: DefId) -> Module<'a> { |
| loop { |
| match self.get_module(def_id) { |
| Some(module) => return module, |
| None => { |
| def_id.index = |
| self.def_key(def_id).parent.expect("non-root `DefId` without parent") |
| } |
| } |
| } |
| } |
| |
| pub fn expect_module(&mut self, def_id: DefId) -> Module<'a> { |
| self.get_module(def_id).expect("argument `DefId` is not a module") |
| } |
| |
| /// If `def_id` refers to a module (in resolver's sense, i.e. a module item, crate root, enum, |
| /// or trait), then this function returns that module's resolver representation, otherwise it |
| /// returns `None`. |
| crate fn get_module(&mut self, def_id: DefId) -> Option<Module<'a>> { |
| if let module @ Some(..) = self.module_map.get(&def_id) { |
| return module.copied(); |
| } |
| |
| if !def_id.is_local() { |
| let def_kind = self.cstore().def_kind(def_id); |
| match def_kind { |
| DefKind::Mod | DefKind::Enum | DefKind::Trait => { |
| let def_key = self.cstore().def_key(def_id); |
| let parent = def_key.parent.map(|index| { |
| self.get_nearest_non_block_module(DefId { index, krate: def_id.krate }) |
| }); |
| let name = if let Some(cnum) = def_id.as_crate_root() { |
| self.cstore().crate_name(cnum) |
| } else { |
| def_key.disambiguated_data.data.get_opt_name().expect("module without name") |
| }; |
| |
| Some(self.new_module( |
| parent, |
| ModuleKind::Def(def_kind, def_id, name), |
| self.cstore().module_expansion_untracked(def_id, &self.session), |
| self.cstore().get_span_untracked(def_id, &self.session), |
| // FIXME: Account for `#[no_implicit_prelude]` attributes. |
| parent.map_or(false, |module| module.no_implicit_prelude), |
| )) |
| } |
| _ => None, |
| } |
| } else { |
| None |
| } |
| } |
| |
| crate fn expn_def_scope(&mut self, expn_id: ExpnId) -> Module<'a> { |
| match expn_id.expn_data().macro_def_id { |
| Some(def_id) => self.macro_def_scope(def_id), |
| None => expn_id |
| .as_local() |
| .and_then(|expn_id| self.ast_transform_scopes.get(&expn_id)) |
| .unwrap_or(&self.graph_root), |
| } |
| } |
| |
| crate fn macro_def_scope(&mut self, def_id: DefId) -> Module<'a> { |
| if let Some(id) = def_id.as_local() { |
| self.local_macro_def_scopes[&id] |
| } else { |
| self.get_nearest_non_block_module(def_id) |
| } |
| } |
| |
| crate fn get_macro(&mut self, res: Res) -> Option<Lrc<SyntaxExtension>> { |
| match res { |
| Res::Def(DefKind::Macro(..), def_id) => Some(self.get_macro_by_def_id(def_id)), |
| Res::NonMacroAttr(_) => Some(self.non_macro_attr.clone()), |
| _ => None, |
| } |
| } |
| |
| crate fn get_macro_by_def_id(&mut self, def_id: DefId) -> Lrc<SyntaxExtension> { |
| if let Some(ext) = self.macro_map.get(&def_id) { |
| return ext.clone(); |
| } |
| |
| let ext = Lrc::new(match self.cstore().load_macro_untracked(def_id, &self.session) { |
| LoadedMacro::MacroDef(item, edition) => self.compile_macro(&item, edition).0, |
| LoadedMacro::ProcMacro(ext) => ext, |
| }); |
| |
| self.macro_map.insert(def_id, ext.clone()); |
| ext |
| } |
| |
| crate fn build_reduced_graph( |
| &mut self, |
| fragment: &AstFragment, |
| parent_scope: ParentScope<'a>, |
| ) -> MacroRulesScopeRef<'a> { |
| collect_definitions(self, fragment, parent_scope.expansion); |
| let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope }; |
| fragment.visit_with(&mut visitor); |
| visitor.parent_scope.macro_rules |
| } |
| |
| crate fn build_reduced_graph_external(&mut self, module: Module<'a>) { |
| for child in self.cstore().module_children_untracked(module.def_id(), self.session) { |
| let parent_scope = ParentScope::module(module, self); |
| BuildReducedGraphVisitor { r: self, parent_scope } |
| .build_reduced_graph_for_external_crate_res(child); |
| } |
| } |
| } |
| |
| struct BuildReducedGraphVisitor<'a, 'b> { |
| r: &'b mut Resolver<'a>, |
| parent_scope: ParentScope<'a>, |
| } |
| |
| impl<'a> AsMut<Resolver<'a>> for BuildReducedGraphVisitor<'a, '_> { |
| fn as_mut(&mut self) -> &mut Resolver<'a> { |
| self.r |
| } |
| } |
| |
| impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> { |
| fn resolve_visibility(&mut self, vis: &ast::Visibility) -> ty::Visibility { |
| self.try_resolve_visibility(vis, true).unwrap_or_else(|err| { |
| self.r.report_vis_error(err); |
| ty::Visibility::Public |
| }) |
| } |
| |
| fn try_resolve_visibility<'ast>( |
| &mut self, |
| vis: &'ast ast::Visibility, |
| finalize: bool, |
| ) -> Result<ty::Visibility, VisResolutionError<'ast>> { |
| let parent_scope = &self.parent_scope; |
| match vis.kind { |
| ast::VisibilityKind::Public => Ok(ty::Visibility::Public), |
| ast::VisibilityKind::Crate(..) => { |
| Ok(ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())) |
| } |
| ast::VisibilityKind::Inherited => { |
| Ok(match self.parent_scope.module.kind { |
| // Any inherited visibility resolved directly inside an enum or trait |
| // (i.e. variants, fields, and trait items) inherits from the visibility |
| // of the enum or trait. |
| ModuleKind::Def(DefKind::Enum | DefKind::Trait, def_id, _) => { |
| self.r.visibilities[&def_id.expect_local()] |
| } |
| // Otherwise, the visibility is restricted to the nearest parent `mod` item. |
| _ => ty::Visibility::Restricted(self.parent_scope.module.nearest_parent_mod()), |
| }) |
| } |
| ast::VisibilityKind::Restricted { ref path, id, .. } => { |
| // Make `PRIVATE_IN_PUBLIC` lint a hard error. |
| self.r.has_pub_restricted = true; |
| // For visibilities we are not ready to provide correct implementation of "uniform |
| // paths" right now, so on 2018 edition we only allow module-relative paths for now. |
| // On 2015 edition visibilities are resolved as crate-relative by default, |
| // so we are prepending a root segment if necessary. |
| let ident = path.segments.get(0).expect("empty path in visibility").ident; |
| let crate_root = if ident.is_path_segment_keyword() { |
| None |
| } else if ident.span.rust_2015() { |
| Some(Segment::from_ident(Ident::new( |
| kw::PathRoot, |
| path.span.shrink_to_lo().with_ctxt(ident.span.ctxt()), |
| ))) |
| } else { |
| return Err(VisResolutionError::Relative2018(ident.span, path)); |
| }; |
| |
| let segments = crate_root |
| .into_iter() |
| .chain(path.segments.iter().map(|seg| seg.into())) |
| .collect::<Vec<_>>(); |
| let expected_found_error = |res| { |
| Err(VisResolutionError::ExpectedFound( |
| path.span, |
| Segment::names_to_string(&segments), |
| res, |
| )) |
| }; |
| match self.r.resolve_path( |
| &segments, |
| Some(TypeNS), |
| parent_scope, |
| finalize.then(|| Finalize::new(id, path.span)), |
| None, |
| ) { |
| PathResult::Module(ModuleOrUniformRoot::Module(module)) => { |
| let res = module.res().expect("visibility resolved to unnamed block"); |
| if finalize { |
| self.r.record_partial_res(id, PartialRes::new(res)); |
| } |
| if module.is_normal() { |
| if res == Res::Err { |
| Ok(ty::Visibility::Public) |
| } else { |
| let vis = ty::Visibility::Restricted(res.def_id()); |
| if self.r.is_accessible_from(vis, parent_scope.module) { |
| Ok(vis) |
| } else { |
| Err(VisResolutionError::AncestorOnly(path.span)) |
| } |
| } |
| } else { |
| expected_found_error(res) |
| } |
| } |
| PathResult::Module(..) => Err(VisResolutionError::ModuleOnly(path.span)), |
| PathResult::NonModule(partial_res) => { |
| expected_found_error(partial_res.base_res()) |
| } |
| PathResult::Failed { span, label, suggestion, .. } => { |
| Err(VisResolutionError::FailedToResolve(span, label, suggestion)) |
| } |
| PathResult::Indeterminate => Err(VisResolutionError::Indeterminate(path.span)), |
| } |
| } |
| } |
| } |
| |
| fn insert_field_names_local(&mut self, def_id: DefId, vdata: &ast::VariantData) { |
| let field_names = vdata |
| .fields() |
| .iter() |
| .map(|field| respan(field.span, field.ident.map_or(kw::Empty, |ident| ident.name))) |
| .collect(); |
| self.insert_field_names(def_id, field_names); |
| } |
| |
| fn insert_field_names(&mut self, def_id: DefId, field_names: Vec<Spanned<Symbol>>) { |
| self.r.field_names.insert(def_id, field_names); |
| } |
| |
| fn block_needs_anonymous_module(&mut self, block: &Block) -> bool { |
| // If any statements are items, we need to create an anonymous module |
| block |
| .stmts |
| .iter() |
| .any(|statement| matches!(statement.kind, StmtKind::Item(_) | StmtKind::MacCall(_))) |
| } |
| |
| // Add an import to the current module. |
| fn add_import( |
| &mut self, |
| module_path: Vec<Segment>, |
| kind: ImportKind<'a>, |
| span: Span, |
| id: NodeId, |
| item: &ast::Item, |
| root_span: Span, |
| root_id: NodeId, |
| vis: ty::Visibility, |
| ) { |
| let current_module = self.parent_scope.module; |
| let import = self.r.arenas.alloc_import(Import { |
| kind, |
| parent_scope: self.parent_scope, |
| module_path, |
| imported_module: Cell::new(None), |
| span, |
| id, |
| use_span: item.span, |
| use_span_with_attributes: item.span_with_attributes(), |
| has_attributes: !item.attrs.is_empty(), |
| root_span, |
| root_id, |
| vis: Cell::new(vis), |
| used: Cell::new(false), |
| }); |
| |
| self.r.indeterminate_imports.push(import); |
| match import.kind { |
| // Don't add unresolved underscore imports to modules |
| ImportKind::Single { target: Ident { name: kw::Underscore, .. }, .. } => {} |
| ImportKind::Single { target, type_ns_only, .. } => { |
| self.r.per_ns(|this, ns| { |
| if !type_ns_only || ns == TypeNS { |
| let key = this.new_key(target, ns); |
| let mut resolution = this.resolution(current_module, key).borrow_mut(); |
| resolution.add_single_import(import); |
| } |
| }); |
| } |
| // We don't add prelude imports to the globs since they only affect lexical scopes, |
| // which are not relevant to import resolution. |
| ImportKind::Glob { is_prelude: true, .. } => {} |
| ImportKind::Glob { .. } => current_module.globs.borrow_mut().push(import), |
| _ => unreachable!(), |
| } |
| } |
| |
| fn build_reduced_graph_for_use_tree( |
| &mut self, |
| // This particular use tree |
| use_tree: &ast::UseTree, |
| id: NodeId, |
| parent_prefix: &[Segment], |
| nested: bool, |
| // The whole `use` item |
| item: &Item, |
| vis: ty::Visibility, |
| root_span: Span, |
| ) { |
| debug!( |
| "build_reduced_graph_for_use_tree(parent_prefix={:?}, use_tree={:?}, nested={})", |
| parent_prefix, use_tree, nested |
| ); |
| |
| let mut prefix_iter = parent_prefix |
| .iter() |
| .cloned() |
| .chain(use_tree.prefix.segments.iter().map(|seg| seg.into())) |
| .peekable(); |
| |
| // On 2015 edition imports are resolved as crate-relative by default, |
| // so prefixes are prepended with crate root segment if necessary. |
| // The root is prepended lazily, when the first non-empty prefix or terminating glob |
| // appears, so imports in braced groups can have roots prepended independently. |
| let is_glob = matches!(use_tree.kind, ast::UseTreeKind::Glob); |
| let crate_root = match prefix_iter.peek() { |
| Some(seg) if !seg.ident.is_path_segment_keyword() && seg.ident.span.rust_2015() => { |
| Some(seg.ident.span.ctxt()) |
| } |
| None if is_glob && use_tree.span.rust_2015() => Some(use_tree.span.ctxt()), |
| _ => None, |
| } |
| .map(|ctxt| { |
| Segment::from_ident(Ident::new( |
| kw::PathRoot, |
| use_tree.prefix.span.shrink_to_lo().with_ctxt(ctxt), |
| )) |
| }); |
| |
| let prefix = crate_root.into_iter().chain(prefix_iter).collect::<Vec<_>>(); |
| debug!("build_reduced_graph_for_use_tree: prefix={:?}", prefix); |
| |
| let empty_for_self = |prefix: &[Segment]| { |
| prefix.is_empty() || prefix.len() == 1 && prefix[0].ident.name == kw::PathRoot |
| }; |
| match use_tree.kind { |
| ast::UseTreeKind::Simple(rename, id1, id2) => { |
| let mut ident = use_tree.ident(); |
| let mut module_path = prefix; |
| let mut source = module_path.pop().unwrap(); |
| let mut type_ns_only = false; |
| |
| self.r.visibilities.insert(self.r.local_def_id(id), vis); |
| if id1 != ast::DUMMY_NODE_ID { |
| self.r.visibilities.insert(self.r.local_def_id(id1), vis); |
| } |
| if id2 != ast::DUMMY_NODE_ID { |
| self.r.visibilities.insert(self.r.local_def_id(id2), vis); |
| } |
| |
| if nested { |
| // Correctly handle `self` |
| if source.ident.name == kw::SelfLower { |
| type_ns_only = true; |
| |
| if empty_for_self(&module_path) { |
| self.r.report_error( |
| use_tree.span, |
| ResolutionError::SelfImportOnlyInImportListWithNonEmptyPrefix, |
| ); |
| return; |
| } |
| |
| // Replace `use foo::{ self };` with `use foo;` |
| source = module_path.pop().unwrap(); |
| if rename.is_none() { |
| ident = source.ident; |
| } |
| } |
| } else { |
| // Disallow `self` |
| if source.ident.name == kw::SelfLower { |
| let parent = module_path.last(); |
| |
| let span = match parent { |
| // only `::self` from `use foo::self as bar` |
| Some(seg) => seg.ident.span.shrink_to_hi().to(source.ident.span), |
| None => source.ident.span, |
| }; |
| let span_with_rename = match rename { |
| // only `self as bar` from `use foo::self as bar` |
| Some(rename) => source.ident.span.to(rename.span), |
| None => source.ident.span, |
| }; |
| self.r.report_error( |
| span, |
| ResolutionError::SelfImportsOnlyAllowedWithin { |
| root: parent.is_none(), |
| span_with_rename, |
| }, |
| ); |
| |
| // Error recovery: replace `use foo::self;` with `use foo;` |
| if let Some(parent) = module_path.pop() { |
| source = parent; |
| if rename.is_none() { |
| ident = source.ident; |
| } |
| } |
| } |
| |
| // Disallow `use $crate;` |
| if source.ident.name == kw::DollarCrate && module_path.is_empty() { |
| let crate_root = self.r.resolve_crate_root(source.ident); |
| let crate_name = match crate_root.kind { |
| ModuleKind::Def(.., name) => name, |
| ModuleKind::Block(..) => unreachable!(), |
| }; |
| // HACK(eddyb) unclear how good this is, but keeping `$crate` |
| // in `source` breaks `src/test/ui/imports/import-crate-var.rs`, |
| // while the current crate doesn't have a valid `crate_name`. |
| if crate_name != kw::Empty { |
| // `crate_name` should not be interpreted as relative. |
| module_path.push(Segment::from_ident_and_id( |
| Ident { name: kw::PathRoot, span: source.ident.span }, |
| self.r.next_node_id(), |
| )); |
| source.ident.name = crate_name; |
| } |
| if rename.is_none() { |
| ident.name = crate_name; |
| } |
| |
| self.r |
| .session |
| .struct_span_err(item.span, "`$crate` may not be imported") |
| .emit(); |
| } |
| } |
| |
| if ident.name == kw::Crate { |
| self.r.session.span_err( |
| ident.span, |
| "crate root imports need to be explicitly named: \ |
| `use crate as name;`", |
| ); |
| } |
| |
| let kind = ImportKind::Single { |
| source: source.ident, |
| target: ident, |
| source_bindings: PerNS { |
| type_ns: Cell::new(Err(Determinacy::Undetermined)), |
| value_ns: Cell::new(Err(Determinacy::Undetermined)), |
| macro_ns: Cell::new(Err(Determinacy::Undetermined)), |
| }, |
| target_bindings: PerNS { |
| type_ns: Cell::new(None), |
| value_ns: Cell::new(None), |
| macro_ns: Cell::new(None), |
| }, |
| type_ns_only, |
| nested, |
| additional_ids: (id1, id2), |
| }; |
| |
| self.add_import( |
| module_path, |
| kind, |
| use_tree.span, |
| id, |
| item, |
| root_span, |
| item.id, |
| vis, |
| ); |
| } |
| ast::UseTreeKind::Glob => { |
| let kind = ImportKind::Glob { |
| is_prelude: self.r.session.contains_name(&item.attrs, sym::prelude_import), |
| max_vis: Cell::new(ty::Visibility::Invisible), |
| }; |
| self.r.visibilities.insert(self.r.local_def_id(id), vis); |
| self.add_import(prefix, kind, use_tree.span, id, item, root_span, item.id, vis); |
| } |
| ast::UseTreeKind::Nested(ref items) => { |
| // Ensure there is at most one `self` in the list |
| let self_spans = items |
| .iter() |
| .filter_map(|&(ref use_tree, _)| { |
| if let ast::UseTreeKind::Simple(..) = use_tree.kind { |
| if use_tree.ident().name == kw::SelfLower { |
| return Some(use_tree.span); |
| } |
| } |
| |
| None |
| }) |
| .collect::<Vec<_>>(); |
| if self_spans.len() > 1 { |
| let mut e = self.r.into_struct_error( |
| self_spans[0], |
| ResolutionError::SelfImportCanOnlyAppearOnceInTheList, |
| ); |
| |
| for other_span in self_spans.iter().skip(1) { |
| e.span_label(*other_span, "another `self` import appears here"); |
| } |
| |
| e.emit(); |
| } |
| |
| for &(ref tree, id) in items { |
| self.build_reduced_graph_for_use_tree( |
| // This particular use tree |
| tree, id, &prefix, true, // The whole `use` item |
| item, vis, root_span, |
| ); |
| } |
| |
| // Empty groups `a::b::{}` are turned into synthetic `self` imports |
| // `a::b::c::{self as _}`, so that their prefixes are correctly |
| // resolved and checked for privacy/stability/etc. |
| if items.is_empty() && !empty_for_self(&prefix) { |
| let new_span = prefix[prefix.len() - 1].ident.span; |
| let tree = ast::UseTree { |
| prefix: ast::Path::from_ident(Ident::new(kw::SelfLower, new_span)), |
| kind: ast::UseTreeKind::Simple( |
| Some(Ident::new(kw::Underscore, new_span)), |
| ast::DUMMY_NODE_ID, |
| ast::DUMMY_NODE_ID, |
| ), |
| span: use_tree.span, |
| }; |
| self.build_reduced_graph_for_use_tree( |
| // This particular use tree |
| &tree, |
| id, |
| &prefix, |
| true, |
| // The whole `use` item |
| item, |
| ty::Visibility::Invisible, |
| root_span, |
| ); |
| } |
| } |
| } |
| } |
| |
| /// Constructs the reduced graph for one item. |
| fn build_reduced_graph_for_item(&mut self, item: &'b Item) { |
| let parent_scope = &self.parent_scope; |
| let parent = parent_scope.module; |
| let expansion = parent_scope.expansion; |
| let ident = item.ident; |
| let sp = item.span; |
| let vis = self.resolve_visibility(&item.vis); |
| let local_def_id = self.r.local_def_id(item.id); |
| let def_id = local_def_id.to_def_id(); |
| |
| self.r.visibilities.insert(local_def_id, vis); |
| |
| match item.kind { |
| ItemKind::Use(ref use_tree) => { |
| self.build_reduced_graph_for_use_tree( |
| // This particular use tree |
| use_tree, |
| item.id, |
| &[], |
| false, |
| // The whole `use` item |
| item, |
| vis, |
| use_tree.span, |
| ); |
| } |
| |
| ItemKind::ExternCrate(orig_name) => { |
| self.build_reduced_graph_for_extern_crate( |
| orig_name, |
| item, |
| local_def_id, |
| vis, |
| parent, |
| ); |
| } |
| |
| ItemKind::Mod(..) => { |
| let module = self.r.new_module( |
| Some(parent), |
| ModuleKind::Def(DefKind::Mod, def_id, ident.name), |
| expansion.to_expn_id(), |
| item.span, |
| parent.no_implicit_prelude |
| || self.r.session.contains_name(&item.attrs, sym::no_implicit_prelude), |
| ); |
| self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
| |
| // Descend into the module. |
| self.parent_scope.module = module; |
| } |
| |
| // These items live in the value namespace. |
| ItemKind::Static(_, mt, _) => { |
| let res = Res::Def(DefKind::Static(mt), def_id); |
| self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
| } |
| ItemKind::Const(..) => { |
| let res = Res::Def(DefKind::Const, def_id); |
| self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
| } |
| ItemKind::Fn(..) => { |
| let res = Res::Def(DefKind::Fn, def_id); |
| self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
| |
| // Functions introducing procedural macros reserve a slot |
| // in the macro namespace as well (see #52225). |
| self.define_macro(item); |
| } |
| |
| // These items live in the type namespace. |
| ItemKind::TyAlias(..) => { |
| let res = Res::Def(DefKind::TyAlias, def_id); |
| self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
| } |
| |
| ItemKind::Enum(_, _) => { |
| let module = self.r.new_module( |
| Some(parent), |
| ModuleKind::Def(DefKind::Enum, def_id, ident.name), |
| expansion.to_expn_id(), |
| item.span, |
| parent.no_implicit_prelude, |
| ); |
| self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
| self.parent_scope.module = module; |
| } |
| |
| ItemKind::TraitAlias(..) => { |
| let res = Res::Def(DefKind::TraitAlias, def_id); |
| self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
| } |
| |
| // These items live in both the type and value namespaces. |
| ItemKind::Struct(ref vdata, _) => { |
| // Define a name in the type namespace. |
| let res = Res::Def(DefKind::Struct, def_id); |
| self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
| |
| // Record field names for error reporting. |
| self.insert_field_names_local(def_id, vdata); |
| |
| // If this is a tuple or unit struct, define a name |
| // in the value namespace as well. |
| if let Some(ctor_node_id) = vdata.ctor_id() { |
| // If the structure is marked as non_exhaustive then lower the visibility |
| // to within the crate. |
| let mut ctor_vis = if vis == ty::Visibility::Public |
| && self.r.session.contains_name(&item.attrs, sym::non_exhaustive) |
| { |
| ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id()) |
| } else { |
| vis |
| }; |
| |
| let mut ret_fields = Vec::with_capacity(vdata.fields().len()); |
| |
| for field in vdata.fields() { |
| // NOTE: The field may be an expansion placeholder, but expansion sets |
| // correct visibilities for unnamed field placeholders specifically, so the |
| // constructor visibility should still be determined correctly. |
| let field_vis = self |
| .try_resolve_visibility(&field.vis, false) |
| .unwrap_or(ty::Visibility::Public); |
| if ctor_vis.is_at_least(field_vis, &*self.r) { |
| ctor_vis = field_vis; |
| } |
| ret_fields.push(field_vis); |
| } |
| let ctor_def_id = self.r.local_def_id(ctor_node_id); |
| let ctor_res = Res::Def( |
| DefKind::Ctor(CtorOf::Struct, CtorKind::from_ast(vdata)), |
| ctor_def_id.to_def_id(), |
| ); |
| self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, sp, expansion)); |
| self.r.visibilities.insert(ctor_def_id, ctor_vis); |
| |
| self.r.struct_constructors.insert(def_id, (ctor_res, ctor_vis, ret_fields)); |
| } |
| } |
| |
| ItemKind::Union(ref vdata, _) => { |
| let res = Res::Def(DefKind::Union, def_id); |
| self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
| |
| // Record field names for error reporting. |
| self.insert_field_names_local(def_id, vdata); |
| } |
| |
| ItemKind::Trait(..) => { |
| // Add all the items within to a new module. |
| let module = self.r.new_module( |
| Some(parent), |
| ModuleKind::Def(DefKind::Trait, def_id, ident.name), |
| expansion.to_expn_id(), |
| item.span, |
| parent.no_implicit_prelude, |
| ); |
| self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
| self.parent_scope.module = module; |
| } |
| |
| // These items do not add names to modules. |
| ItemKind::Impl(box Impl { of_trait: Some(..), .. }) => { |
| self.r.trait_impl_items.insert(local_def_id); |
| } |
| ItemKind::Impl { .. } | ItemKind::ForeignMod(..) | ItemKind::GlobalAsm(..) => {} |
| |
| ItemKind::MacroDef(..) | ItemKind::MacCall(_) => unreachable!(), |
| } |
| } |
| |
| fn build_reduced_graph_for_extern_crate( |
| &mut self, |
| orig_name: Option<Symbol>, |
| item: &Item, |
| local_def_id: LocalDefId, |
| vis: ty::Visibility, |
| parent: Module<'a>, |
| ) { |
| let ident = item.ident; |
| let sp = item.span; |
| let parent_scope = self.parent_scope; |
| let expansion = parent_scope.expansion; |
| |
| let (used, module, binding) = if orig_name.is_none() && ident.name == kw::SelfLower { |
| self.r |
| .session |
| .struct_span_err(item.span, "`extern crate self;` requires renaming") |
| .span_suggestion( |
| item.span, |
| "rename the `self` crate to be able to import it", |
| "extern crate self as name;", |
| Applicability::HasPlaceholders, |
| ) |
| .emit(); |
| return; |
| } else if orig_name == Some(kw::SelfLower) { |
| Some(self.r.graph_root) |
| } else { |
| self.r.crate_loader.process_extern_crate(item, &self.r.definitions, local_def_id).map( |
| |crate_id| { |
| self.r.extern_crate_map.insert(local_def_id, crate_id); |
| self.r.expect_module(crate_id.as_def_id()) |
| }, |
| ) |
| } |
| .map(|module| { |
| let used = self.process_macro_use_imports(item, module); |
| let binding = |
| (module, ty::Visibility::Public, sp, expansion).to_name_binding(self.r.arenas); |
| (used, Some(ModuleOrUniformRoot::Module(module)), binding) |
| }) |
| .unwrap_or((true, None, self.r.dummy_binding)); |
| let import = self.r.arenas.alloc_import(Import { |
| kind: ImportKind::ExternCrate { source: orig_name, target: ident }, |
| root_id: item.id, |
| id: item.id, |
| parent_scope: self.parent_scope, |
| imported_module: Cell::new(module), |
| has_attributes: !item.attrs.is_empty(), |
| use_span_with_attributes: item.span_with_attributes(), |
| use_span: item.span, |
| root_span: item.span, |
| span: item.span, |
| module_path: Vec::new(), |
| vis: Cell::new(vis), |
| used: Cell::new(used), |
| }); |
| self.r.potentially_unused_imports.push(import); |
| let imported_binding = self.r.import(binding, import); |
| if ptr::eq(parent, self.r.graph_root) { |
| if let Some(entry) = self.r.extern_prelude.get(&ident.normalize_to_macros_2_0()) { |
| if expansion != LocalExpnId::ROOT |
| && orig_name.is_some() |
| && entry.extern_crate_item.is_none() |
| { |
| let msg = "macro-expanded `extern crate` items cannot \ |
| shadow names passed with `--extern`"; |
| self.r.session.span_err(item.span, msg); |
| } |
| } |
| let entry = self.r.extern_prelude.entry(ident.normalize_to_macros_2_0()).or_insert( |
| ExternPreludeEntry { extern_crate_item: None, introduced_by_item: true }, |
| ); |
| entry.extern_crate_item = Some(imported_binding); |
| if orig_name.is_some() { |
| entry.introduced_by_item = true; |
| } |
| } |
| self.r.define(parent, ident, TypeNS, imported_binding); |
| } |
| |
| /// Constructs the reduced graph for one foreign item. |
| fn build_reduced_graph_for_foreign_item(&mut self, item: &ForeignItem) { |
| let local_def_id = self.r.local_def_id(item.id); |
| let def_id = local_def_id.to_def_id(); |
| let (def_kind, ns) = match item.kind { |
| ForeignItemKind::Fn(..) => (DefKind::Fn, ValueNS), |
| ForeignItemKind::Static(_, mt, _) => (DefKind::Static(mt), ValueNS), |
| ForeignItemKind::TyAlias(..) => (DefKind::ForeignTy, TypeNS), |
| ForeignItemKind::MacCall(_) => unreachable!(), |
| }; |
| let parent = self.parent_scope.module; |
| let expansion = self.parent_scope.expansion; |
| let vis = self.resolve_visibility(&item.vis); |
| let res = Res::Def(def_kind, def_id); |
| self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion)); |
| self.r.visibilities.insert(local_def_id, vis); |
| } |
| |
| fn build_reduced_graph_for_block(&mut self, block: &Block) { |
| let parent = self.parent_scope.module; |
| let expansion = self.parent_scope.expansion; |
| if self.block_needs_anonymous_module(block) { |
| let module = self.r.new_module( |
| Some(parent), |
| ModuleKind::Block(block.id), |
| expansion.to_expn_id(), |
| block.span, |
| parent.no_implicit_prelude, |
| ); |
| self.r.block_map.insert(block.id, module); |
| self.parent_scope.module = module; // Descend into the block. |
| } |
| } |
| |
| /// Builds the reduced graph for a single item in an external crate. |
| fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) { |
| let parent = self.parent_scope.module; |
| let ModChild { ident, res, vis, span, macro_rules } = child; |
| let res = res.expect_non_local(); |
| let expansion = self.parent_scope.expansion; |
| // Record primary definitions. |
| match res { |
| Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, def_id) => { |
| let module = self.r.expect_module(def_id); |
| self.r.define(parent, ident, TypeNS, (module, vis, span, expansion)); |
| } |
| Res::Def( |
| DefKind::Struct |
| | DefKind::Union |
| | DefKind::Variant |
| | DefKind::TyAlias |
| | DefKind::ForeignTy |
| | DefKind::OpaqueTy |
| | DefKind::TraitAlias |
| | DefKind::AssocTy, |
| _, |
| ) |
| | Res::PrimTy(..) |
| | Res::ToolMod => self.r.define(parent, ident, TypeNS, (res, vis, span, expansion)), |
| Res::Def( |
| DefKind::Fn |
| | DefKind::AssocFn |
| | DefKind::Static(_) |
| | DefKind::Const |
| | DefKind::AssocConst |
| | DefKind::Ctor(..), |
| _, |
| ) => self.r.define(parent, ident, ValueNS, (res, vis, span, expansion)), |
| Res::Def(DefKind::Macro(..), _) | Res::NonMacroAttr(..) => { |
| if !macro_rules { |
| self.r.define(parent, ident, MacroNS, (res, vis, span, expansion)) |
| } |
| } |
| Res::Def( |
| DefKind::TyParam |
| | DefKind::ConstParam |
| | DefKind::ExternCrate |
| | DefKind::Use |
| | DefKind::ForeignMod |
| | DefKind::AnonConst |
| | DefKind::InlineConst |
| | DefKind::Field |
| | DefKind::LifetimeParam |
| | DefKind::GlobalAsm |
| | DefKind::Closure |
| | DefKind::Impl |
| | DefKind::Generator, |
| _, |
| ) |
| | Res::Local(..) |
| | Res::SelfTy { .. } |
| | Res::SelfCtor(..) |
| | Res::Err => bug!("unexpected resolution: {:?}", res), |
| } |
| // Record some extra data for better diagnostics. |
| let cstore = self.r.cstore(); |
| match res { |
| Res::Def(DefKind::Struct, def_id) => { |
| let field_names = |
| cstore.struct_field_names_untracked(def_id, self.r.session).collect(); |
| let ctor = cstore.ctor_def_id_and_kind_untracked(def_id); |
| if let Some((ctor_def_id, ctor_kind)) = ctor { |
| let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id); |
| let ctor_vis = cstore.visibility_untracked(ctor_def_id); |
| let field_visibilities = |
| cstore.struct_field_visibilities_untracked(def_id).collect(); |
| self.r |
| .struct_constructors |
| .insert(def_id, (ctor_res, ctor_vis, field_visibilities)); |
| } |
| self.insert_field_names(def_id, field_names); |
| } |
| Res::Def(DefKind::Union, def_id) => { |
| let field_names = |
| cstore.struct_field_names_untracked(def_id, self.r.session).collect(); |
| self.insert_field_names(def_id, field_names); |
| } |
| Res::Def(DefKind::AssocFn, def_id) => { |
| if cstore.fn_has_self_parameter_untracked(def_id) { |
| self.r.has_self.insert(def_id); |
| } |
| } |
| _ => {} |
| } |
| } |
| |
| fn add_macro_use_binding( |
| &mut self, |
| name: Symbol, |
| binding: &'a NameBinding<'a>, |
| span: Span, |
| allow_shadowing: bool, |
| ) { |
| if self.r.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing { |
| let msg = format!("`{}` is already in scope", name); |
| let note = |
| "macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)"; |
| self.r.session.struct_span_err(span, &msg).note(note).emit(); |
| } |
| } |
| |
| /// Returns `true` if we should consider the underlying `extern crate` to be used. |
| fn process_macro_use_imports(&mut self, item: &Item, module: Module<'a>) -> bool { |
| let mut import_all = None; |
| let mut single_imports = Vec::new(); |
| for attr in &item.attrs { |
| if attr.has_name(sym::macro_use) { |
| if self.parent_scope.module.parent.is_some() { |
| struct_span_err!( |
| self.r.session, |
| item.span, |
| E0468, |
| "an `extern crate` loading macros must be at the crate root" |
| ) |
| .emit(); |
| } |
| if let ItemKind::ExternCrate(Some(orig_name)) = item.kind { |
| if orig_name == kw::SelfLower { |
| self.r |
| .session |
| .struct_span_err( |
| attr.span, |
| "`#[macro_use]` is not supported on `extern crate self`", |
| ) |
| .emit(); |
| } |
| } |
| let ill_formed = |span| { |
| struct_span_err!(self.r.session, span, E0466, "bad macro import").emit(); |
| }; |
| match attr.meta() { |
| Some(meta) => match meta.kind { |
| MetaItemKind::Word => { |
| import_all = Some(meta.span); |
| break; |
| } |
| MetaItemKind::List(nested_metas) => { |
| for nested_meta in nested_metas { |
| match nested_meta.ident() { |
| Some(ident) if nested_meta.is_word() => { |
| single_imports.push(ident) |
| } |
| _ => ill_formed(nested_meta.span()), |
| } |
| } |
| } |
| MetaItemKind::NameValue(..) => ill_formed(meta.span), |
| }, |
| None => ill_formed(attr.span), |
| } |
| } |
| } |
| |
| let macro_use_import = |this: &Self, span| { |
| this.r.arenas.alloc_import(Import { |
| kind: ImportKind::MacroUse, |
| root_id: item.id, |
| id: item.id, |
| parent_scope: this.parent_scope, |
| imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))), |
| use_span_with_attributes: item.span_with_attributes(), |
| has_attributes: !item.attrs.is_empty(), |
| use_span: item.span, |
| root_span: span, |
| span, |
| module_path: Vec::new(), |
| vis: Cell::new(ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())), |
| used: Cell::new(false), |
| }) |
| }; |
| |
| let allow_shadowing = self.parent_scope.expansion == LocalExpnId::ROOT; |
| if let Some(span) = import_all { |
| let import = macro_use_import(self, span); |
| self.r.potentially_unused_imports.push(import); |
| module.for_each_child(self, |this, ident, ns, binding| { |
| if ns == MacroNS { |
| let imported_binding = this.r.import(binding, import); |
| this.add_macro_use_binding(ident.name, imported_binding, span, allow_shadowing); |
| } |
| }); |
| } else { |
| for ident in single_imports.iter().cloned() { |
| let result = self.r.maybe_resolve_ident_in_module( |
| ModuleOrUniformRoot::Module(module), |
| ident, |
| MacroNS, |
| &self.parent_scope, |
| ); |
| if let Ok(binding) = result { |
| let import = macro_use_import(self, ident.span); |
| self.r.potentially_unused_imports.push(import); |
| let imported_binding = self.r.import(binding, import); |
| self.add_macro_use_binding( |
| ident.name, |
| imported_binding, |
| ident.span, |
| allow_shadowing, |
| ); |
| } else { |
| struct_span_err!(self.r.session, ident.span, E0469, "imported macro not found") |
| .emit(); |
| } |
| } |
| } |
| import_all.is_some() || !single_imports.is_empty() |
| } |
| |
| /// Returns `true` if this attribute list contains `macro_use`. |
| fn contains_macro_use(&mut self, attrs: &[ast::Attribute]) -> bool { |
| for attr in attrs { |
| if attr.has_name(sym::macro_escape) { |
| let msg = "`#[macro_escape]` is a deprecated synonym for `#[macro_use]`"; |
| let mut err = self.r.session.struct_span_warn(attr.span, msg); |
| if let ast::AttrStyle::Inner = attr.style { |
| err.help("try an outer attribute: `#[macro_use]`").emit(); |
| } else { |
| err.emit(); |
| } |
| } else if !attr.has_name(sym::macro_use) { |
| continue; |
| } |
| |
| if !attr.is_word() { |
| self.r.session.span_err(attr.span, "arguments to `macro_use` are not allowed here"); |
| } |
| return true; |
| } |
| |
| false |
| } |
| |
| fn visit_invoc(&mut self, id: NodeId) -> LocalExpnId { |
| let invoc_id = id.placeholder_to_expn_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"); |
| invoc_id |
| } |
| |
| /// Visit invocation in context in which it can emit a named item (possibly `macro_rules`) |
| /// directly into its parent scope's module. |
| fn visit_invoc_in_module(&mut self, id: NodeId) -> MacroRulesScopeRef<'a> { |
| let invoc_id = self.visit_invoc(id); |
| self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id); |
| self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Invocation(invoc_id)) |
| } |
| |
| fn proc_macro_stub(&self, item: &ast::Item) -> Option<(MacroKind, Ident, Span)> { |
| if self.r.session.contains_name(&item.attrs, sym::proc_macro) { |
| return Some((MacroKind::Bang, item.ident, item.span)); |
| } else if self.r.session.contains_name(&item.attrs, sym::proc_macro_attribute) { |
| return Some((MacroKind::Attr, item.ident, item.span)); |
| } else if let Some(attr) = self.r.session.find_by_name(&item.attrs, sym::proc_macro_derive) |
| { |
| if let Some(nested_meta) = attr.meta_item_list().and_then(|list| list.get(0).cloned()) { |
| if let Some(ident) = nested_meta.ident() { |
| return Some((MacroKind::Derive, ident, ident.span)); |
| } |
| } |
| } |
| None |
| } |
| |
| // Mark the given macro as unused unless its name starts with `_`. |
| // Macro uses will remove items from this set, and the remaining |
| // items will be reported as `unused_macros`. |
| fn insert_unused_macro( |
| &mut self, |
| ident: Ident, |
| def_id: LocalDefId, |
| node_id: NodeId, |
| rule_spans: &[Span], |
| ) { |
| if !ident.as_str().starts_with('_') { |
| self.r.unused_macros.insert(def_id, (node_id, ident)); |
| for (rule_i, rule_span) in rule_spans.iter().enumerate() { |
| self.r.unused_macro_rules.insert((def_id, rule_i), (ident, *rule_span)); |
| } |
| } |
| } |
| |
| fn define_macro(&mut self, item: &ast::Item) -> MacroRulesScopeRef<'a> { |
| let parent_scope = self.parent_scope; |
| let expansion = parent_scope.expansion; |
| let def_id = self.r.local_def_id(item.id); |
| let (ext, ident, span, macro_rules, rule_spans) = match &item.kind { |
| ItemKind::MacroDef(def) => { |
| let (ext, rule_spans) = self.r.compile_macro(item, self.r.session.edition()); |
| let ext = Lrc::new(ext); |
| (ext, item.ident, item.span, def.macro_rules, rule_spans) |
| } |
| ItemKind::Fn(..) => match self.proc_macro_stub(item) { |
| Some((macro_kind, ident, span)) => { |
| self.r.proc_macro_stubs.insert(def_id); |
| (self.r.dummy_ext(macro_kind), ident, span, false, Vec::new()) |
| } |
| None => return parent_scope.macro_rules, |
| }, |
| _ => unreachable!(), |
| }; |
| |
| let res = Res::Def(DefKind::Macro(ext.macro_kind()), def_id.to_def_id()); |
| self.r.macro_map.insert(def_id.to_def_id(), ext); |
| self.r.local_macro_def_scopes.insert(def_id, parent_scope.module); |
| |
| if macro_rules { |
| let ident = ident.normalize_to_macros_2_0(); |
| self.r.macro_names.insert(ident); |
| let is_macro_export = self.r.session.contains_name(&item.attrs, sym::macro_export); |
| let vis = if is_macro_export { |
| ty::Visibility::Public |
| } else { |
| ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id()) |
| }; |
| let binding = (res, vis, span, expansion).to_name_binding(self.r.arenas); |
| self.r.set_binding_parent_module(binding, parent_scope.module); |
| if is_macro_export { |
| let module = self.r.graph_root; |
| self.r.define(module, ident, MacroNS, (res, vis, span, expansion, IsMacroExport)); |
| } else { |
| self.r.check_reserved_macro_name(ident, res); |
| self.insert_unused_macro(ident, def_id, item.id, &rule_spans); |
| } |
| self.r.visibilities.insert(def_id, vis); |
| let scope = self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Binding( |
| self.r.arenas.alloc_macro_rules_binding(MacroRulesBinding { |
| parent_macro_rules_scope: parent_scope.macro_rules, |
| binding, |
| ident, |
| }), |
| )); |
| self.r.macro_rules_scopes.insert(def_id, scope); |
| scope |
| } else { |
| let module = parent_scope.module; |
| let vis = match item.kind { |
| // Visibilities must not be resolved non-speculatively twice |
| // and we already resolved this one as a `fn` item visibility. |
| ItemKind::Fn(..) => { |
| self.try_resolve_visibility(&item.vis, false).unwrap_or(ty::Visibility::Public) |
| } |
| _ => self.resolve_visibility(&item.vis), |
| }; |
| if vis != ty::Visibility::Public { |
| self.insert_unused_macro(ident, def_id, item.id, &rule_spans); |
| } |
| self.r.define(module, ident, MacroNS, (res, vis, span, expansion)); |
| self.r.visibilities.insert(def_id, vis); |
| self.parent_scope.macro_rules |
| } |
| } |
| } |
| |
| macro_rules! method { |
| ($visit:ident: $ty:ty, $invoc:path, $walk:ident) => { |
| fn $visit(&mut self, node: &'b $ty) { |
| if let $invoc(..) = node.kind { |
| self.visit_invoc(node.id); |
| } else { |
| visit::$walk(self, node); |
| } |
| } |
| }; |
| } |
| |
| impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> { |
| method!(visit_expr: ast::Expr, ast::ExprKind::MacCall, walk_expr); |
| method!(visit_pat: ast::Pat, ast::PatKind::MacCall, walk_pat); |
| method!(visit_ty: ast::Ty, ast::TyKind::MacCall, walk_ty); |
| |
| fn visit_item(&mut self, item: &'b Item) { |
| let orig_module_scope = self.parent_scope.module; |
| self.parent_scope.macro_rules = match item.kind { |
| ItemKind::MacroDef(..) => { |
| let macro_rules_scope = self.define_macro(item); |
| visit::walk_item(self, item); |
| macro_rules_scope |
| } |
| ItemKind::MacCall(..) => { |
| let macro_rules_scope = self.visit_invoc_in_module(item.id); |
| visit::walk_item(self, item); |
| macro_rules_scope |
| } |
| _ => { |
| let orig_macro_rules_scope = self.parent_scope.macro_rules; |
| self.build_reduced_graph_for_item(item); |
| visit::walk_item(self, item); |
| match item.kind { |
| ItemKind::Mod(..) if self.contains_macro_use(&item.attrs) => { |
| self.parent_scope.macro_rules |
| } |
| _ => orig_macro_rules_scope, |
| } |
| } |
| }; |
| self.parent_scope.module = orig_module_scope; |
| } |
| |
| fn visit_stmt(&mut self, stmt: &'b ast::Stmt) { |
| if let ast::StmtKind::MacCall(..) = stmt.kind { |
| self.parent_scope.macro_rules = self.visit_invoc_in_module(stmt.id); |
| } else { |
| visit::walk_stmt(self, stmt); |
| } |
| } |
| |
| fn visit_foreign_item(&mut self, foreign_item: &'b ForeignItem) { |
| if let ForeignItemKind::MacCall(_) = foreign_item.kind { |
| self.visit_invoc_in_module(foreign_item.id); |
| return; |
| } |
| |
| self.build_reduced_graph_for_foreign_item(foreign_item); |
| visit::walk_foreign_item(self, foreign_item); |
| } |
| |
| fn visit_block(&mut self, block: &'b Block) { |
| let orig_current_module = self.parent_scope.module; |
| 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.macro_rules = orig_current_macro_rules_scope; |
| } |
| |
| fn visit_assoc_item(&mut self, item: &'b AssocItem, ctxt: AssocCtxt) { |
| if let AssocItemKind::MacCall(_) = item.kind { |
| match ctxt { |
| AssocCtxt::Trait => { |
| self.visit_invoc_in_module(item.id); |
| } |
| AssocCtxt::Impl => { |
| self.visit_invoc(item.id); |
| } |
| } |
| return; |
| } |
| |
| let vis = self.resolve_visibility(&item.vis); |
| let local_def_id = self.r.local_def_id(item.id); |
| let def_id = local_def_id.to_def_id(); |
| |
| if !(ctxt == AssocCtxt::Impl |
| && matches!(item.vis.kind, ast::VisibilityKind::Inherited) |
| && self |
| .r |
| .trait_impl_items |
| .contains(&ty::DefIdTree::local_parent(&*self.r, local_def_id))) |
| { |
| // Trait impl item visibility is inherited from its trait when not specified |
| // explicitly. In that case we cannot determine it here in early resolve, |
| // so we leave a hole in the visibility table to be filled later. |
| self.r.visibilities.insert(local_def_id, vis); |
| } |
| |
| if ctxt == AssocCtxt::Trait { |
| let (def_kind, ns) = match item.kind { |
| AssocItemKind::Const(..) => (DefKind::AssocConst, ValueNS), |
| AssocItemKind::Fn(box Fn { ref sig, .. }) => { |
| if sig.decl.has_self() { |
| self.r.has_self.insert(def_id); |
| } |
| (DefKind::AssocFn, ValueNS) |
| } |
| AssocItemKind::TyAlias(..) => (DefKind::AssocTy, TypeNS), |
| AssocItemKind::MacCall(_) => bug!(), // handled above |
| }; |
| |
| let parent = self.parent_scope.module; |
| let expansion = self.parent_scope.expansion; |
| let res = Res::Def(def_kind, def_id); |
| self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion)); |
| } |
| |
| visit::walk_assoc_item(self, item, ctxt); |
| } |
| |
| fn visit_attribute(&mut self, attr: &'b ast::Attribute) { |
| 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)); |
| } |
| visit::walk_attribute(self, attr); |
| } |
| |
| fn visit_arm(&mut self, arm: &'b ast::Arm) { |
| if arm.is_placeholder { |
| self.visit_invoc(arm.id); |
| } else { |
| visit::walk_arm(self, arm); |
| } |
| } |
| |
| fn visit_expr_field(&mut self, f: &'b ast::ExprField) { |
| if f.is_placeholder { |
| self.visit_invoc(f.id); |
| } else { |
| visit::walk_expr_field(self, f); |
| } |
| } |
| |
| fn visit_pat_field(&mut self, fp: &'b ast::PatField) { |
| if fp.is_placeholder { |
| self.visit_invoc(fp.id); |
| } else { |
| visit::walk_pat_field(self, fp); |
| } |
| } |
| |
| fn visit_generic_param(&mut self, param: &'b ast::GenericParam) { |
| if param.is_placeholder { |
| self.visit_invoc(param.id); |
| } else { |
| visit::walk_generic_param(self, param); |
| } |
| } |
| |
| fn visit_param(&mut self, p: &'b ast::Param) { |
| if p.is_placeholder { |
| self.visit_invoc(p.id); |
| } else { |
| visit::walk_param(self, p); |
| } |
| } |
| |
| fn visit_field_def(&mut self, sf: &'b ast::FieldDef) { |
| if sf.is_placeholder { |
| self.visit_invoc(sf.id); |
| } else { |
| let vis = self.resolve_visibility(&sf.vis); |
| self.r.visibilities.insert(self.r.local_def_id(sf.id), vis); |
| visit::walk_field_def(self, sf); |
| } |
| } |
| |
| // Constructs the reduced graph for one variant. Variants exist in the |
| // type and value namespaces. |
| fn visit_variant(&mut self, variant: &'b ast::Variant) { |
| if variant.is_placeholder { |
| self.visit_invoc_in_module(variant.id); |
| return; |
| } |
| |
| let parent = self.parent_scope.module; |
| let expn_id = self.parent_scope.expansion; |
| let ident = variant.ident; |
| |
| // Define a name in the type namespace. |
| let def_id = self.r.local_def_id(variant.id); |
| let res = Res::Def(DefKind::Variant, def_id.to_def_id()); |
| let vis = self.resolve_visibility(&variant.vis); |
| self.r.define(parent, ident, TypeNS, (res, vis, variant.span, expn_id)); |
| self.r.visibilities.insert(def_id, vis); |
| |
| // If the variant is marked as non_exhaustive then lower the visibility to within the crate. |
| let ctor_vis = if vis == ty::Visibility::Public |
| && self.r.session.contains_name(&variant.attrs, sym::non_exhaustive) |
| { |
| ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id()) |
| } else { |
| vis |
| }; |
| |
| // Define a constructor name in the value namespace. |
| // Braced variants, unlike structs, generate unusable names in |
| // value namespace, they are reserved for possible future use. |
| // It's ok to use the variant's id as a ctor id since an |
| // error will be reported on any use of such resolution anyway. |
| let ctor_node_id = variant.data.ctor_id().unwrap_or(variant.id); |
| let ctor_def_id = self.r.local_def_id(ctor_node_id); |
| let ctor_kind = CtorKind::from_ast(&variant.data); |
| let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id.to_def_id()); |
| self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, variant.span, expn_id)); |
| if ctor_def_id != def_id { |
| self.r.visibilities.insert(ctor_def_id, ctor_vis); |
| } |
| // Record field names for error reporting. |
| self.insert_field_names_local(ctor_def_id.to_def_id(), &variant.data); |
| |
| visit::walk_variant(self, variant); |
| } |
| |
| fn visit_crate(&mut self, krate: &'b ast::Crate) { |
| if krate.is_placeholder { |
| self.visit_invoc_in_module(krate.id); |
| } else { |
| visit::walk_crate(self, krate); |
| self.contains_macro_use(&krate.attrs); |
| } |
| } |
| } |
