]>
Commit | Line | Data |
---|---|---|
e1599b0c XL |
1 | //! After we obtain a fresh AST fragment from a macro, code in this module helps to integrate |
2 | //! that fragment into the module structures that are already partially built. | |
1a4d82fc | 3 | //! |
e1599b0c XL |
4 | //! Items from the fragment are placed into modules, |
5 | //! unexpanded macros in the fragment are visited and registered. | |
6 | //! Imports are also considered items and placed into modules here, but not resolved yet. | |
1a4d82fc | 7 | |
60c5eb7d | 8 | use crate::def_collector::collect_definitions; |
74b04a01 | 9 | use crate::imports::{Import, ImportKind}; |
29967ef6 | 10 | use crate::macros::{MacroRulesBinding, MacroRulesScope, MacroRulesScopeRef}; |
dfeec247 | 11 | use crate::Namespace::{self, MacroNS, TypeNS, ValueNS}; |
5e7ed085 | 12 | use crate::{Determinacy, ExternPreludeEntry, Finalize, Module, ModuleKind, ModuleOrUniformRoot}; |
923072b8 FG |
13 | use crate::{ |
14 | MacroData, NameBinding, NameBindingKind, ParentScope, PathResult, PerNS, ResolutionError, | |
15 | }; | |
c295e0f8 | 16 | use crate::{Resolver, ResolverArenas, Segment, ToNameBinding, VisResolutionError}; |
1a4d82fc | 17 | |
74b04a01 | 18 | use rustc_ast::visit::{self, AssocCtxt, Visitor}; |
5869c6ff | 19 | use rustc_ast::{self as ast, AssocItem, AssocItemKind, MetaItemKind, StmtKind}; |
3c0e092e | 20 | use rustc_ast::{Block, Fn, ForeignItem, ForeignItemKind, Impl, Item, ItemKind, NodeId}; |
74b04a01 | 21 | use rustc_attr as attr; |
0531ce1d | 22 | use rustc_data_structures::sync::Lrc; |
dfeec247 | 23 | use rustc_errors::{struct_span_err, Applicability}; |
dfeec247 XL |
24 | use rustc_expand::expand::AstFragment; |
25 | use rustc_hir::def::{self, *}; | |
04454e1e | 26 | use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID}; |
dfeec247 | 27 | use rustc_metadata::creader::LoadedMacro; |
ba9703b0 | 28 | use rustc_middle::bug; |
5099ac24 | 29 | use rustc_middle::metadata::ModChild; |
923072b8 | 30 | use rustc_middle::ty::{self, DefIdTree}; |
c295e0f8 | 31 | use rustc_session::cstore::CrateStore; |
136023e0 | 32 | use rustc_span::hygiene::{ExpnId, LocalExpnId, MacroKind}; |
dfeec247 | 33 | use rustc_span::source_map::{respan, Spanned}; |
f9f354fc | 34 | use rustc_span::symbol::{kw, sym, Ident, Symbol}; |
3dfed10e | 35 | use rustc_span::Span; |
3157f602 | 36 | |
dfeec247 XL |
37 | use std::cell::Cell; |
38 | use std::ptr; | |
3dfed10e | 39 | use tracing::debug; |
60c5eb7d | 40 | |
48663c56 XL |
41 | type Res = def::Res<NodeId>; |
42 | ||
136023e0 | 43 | impl<'a> ToNameBinding<'a> for (Module<'a>, ty::Visibility, Span, LocalExpnId) { |
32a655c1 SL |
44 | fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
45 | arenas.alloc_name_binding(NameBinding { | |
476ff2be | 46 | kind: NameBindingKind::Module(self.0), |
0731742a | 47 | ambiguity: None, |
476ff2be SL |
48 | vis: self.1, |
49 | span: self.2, | |
50 | expansion: self.3, | |
32a655c1 | 51 | }) |
7453a54e SL |
52 | } |
53 | } | |
54 | ||
136023e0 | 55 | impl<'a> ToNameBinding<'a> for (Res, ty::Visibility, Span, LocalExpnId) { |
32a655c1 SL |
56 | fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
57 | arenas.alloc_name_binding(NameBinding { | |
48663c56 | 58 | kind: NameBindingKind::Res(self.0, false), |
0731742a | 59 | ambiguity: None, |
b7449926 XL |
60 | vis: self.1, |
61 | span: self.2, | |
62 | expansion: self.3, | |
63 | }) | |
64 | } | |
65 | } | |
66 | ||
e1599b0c | 67 | struct IsMacroExport; |
b7449926 | 68 | |
136023e0 | 69 | impl<'a> ToNameBinding<'a> for (Res, ty::Visibility, Span, LocalExpnId, IsMacroExport) { |
b7449926 XL |
70 | fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
71 | arenas.alloc_name_binding(NameBinding { | |
48663c56 | 72 | kind: NameBindingKind::Res(self.0, true), |
0731742a | 73 | ambiguity: None, |
476ff2be SL |
74 | vis: self.1, |
75 | span: self.2, | |
76 | expansion: self.3, | |
32a655c1 | 77 | }) |
7453a54e SL |
78 | } |
79 | } | |
80 | ||
0731742a | 81 | impl<'a> Resolver<'a> { |
7453a54e SL |
82 | /// Defines `name` in namespace `ns` of module `parent` to be `def` if it is not yet defined; |
83 | /// otherwise, reports an error. | |
923072b8 | 84 | pub(crate) fn define<T>(&mut self, parent: Module<'a>, ident: Ident, ns: Namespace, def: T) |
dfeec247 XL |
85 | where |
86 | T: ToNameBinding<'a>, | |
5bcae85e | 87 | { |
32a655c1 | 88 | let binding = def.to_name_binding(self.arenas); |
e74abb32 XL |
89 | let key = self.new_key(ident, ns); |
90 | if let Err(old_binding) = self.try_define(parent, key, binding) { | |
32a655c1 | 91 | self.report_conflict(parent, ident, ns, old_binding, &binding); |
1a4d82fc JJ |
92 | } |
93 | } | |
94 | ||
29967ef6 | 95 | /// Walks up the tree of definitions starting at `def_id`, |
c295e0f8 XL |
96 | /// stopping at the first encountered module. |
97 | /// Parent block modules for arbitrary def-ids are not recorded for the local crate, | |
98 | /// and are not preserved in metadata for foreign crates, so block modules are never | |
99 | /// returned by this function. | |
100 | /// | |
101 | /// For the local crate ignoring block modules may be incorrect, so use this method with care. | |
102 | /// | |
103 | /// For foreign crates block modules can be ignored without introducing observable differences, | |
104 | /// moreover they has to be ignored right now because they are not kept in metadata. | |
105 | /// Foreign parent modules are used for resolving names used by foreign macros with def-site | |
106 | /// hygiene, therefore block module ignorability relies on macros with def-site hygiene and | |
107 | /// block module parents being unreachable from other crates. | |
108 | /// Reachable macros with block module parents exist due to `#[macro_export] macro_rules!`, | |
109 | /// but they cannot use def-site hygiene, so the assumption holds | |
110 | /// (<https://github.com/rust-lang/rust/pull/77984#issuecomment-712445508>). | |
5099ac24 | 111 | pub fn get_nearest_non_block_module(&mut self, mut def_id: DefId) -> Module<'a> { |
c295e0f8 XL |
112 | loop { |
113 | match self.get_module(def_id) { | |
114 | Some(module) => return module, | |
923072b8 | 115 | None => def_id = self.parent(def_id), |
c295e0f8 | 116 | } |
29967ef6 | 117 | } |
29967ef6 XL |
118 | } |
119 | ||
c295e0f8 XL |
120 | pub fn expect_module(&mut self, def_id: DefId) -> Module<'a> { |
121 | self.get_module(def_id).expect("argument `DefId` is not a module") | |
122 | } | |
416331ca | 123 | |
c295e0f8 XL |
124 | /// If `def_id` refers to a module (in resolver's sense, i.e. a module item, crate root, enum, |
125 | /// or trait), then this function returns that module's resolver representation, otherwise it | |
126 | /// returns `None`. | |
923072b8 | 127 | pub(crate) fn get_module(&mut self, def_id: DefId) -> Option<Module<'a>> { |
c295e0f8 XL |
128 | if let module @ Some(..) = self.module_map.get(&def_id) { |
129 | return module.copied(); | |
416331ca XL |
130 | } |
131 | ||
c295e0f8 XL |
132 | if !def_id.is_local() { |
133 | let def_kind = self.cstore().def_kind(def_id); | |
134 | match def_kind { | |
135 | DefKind::Mod | DefKind::Enum | DefKind::Trait => { | |
136 | let def_key = self.cstore().def_key(def_id); | |
137 | let parent = def_key.parent.map(|index| { | |
138 | self.get_nearest_non_block_module(DefId { index, krate: def_id.krate }) | |
139 | }); | |
04454e1e FG |
140 | let name = if let Some(cnum) = def_id.as_crate_root() { |
141 | self.cstore().crate_name(cnum) | |
c295e0f8 XL |
142 | } else { |
143 | def_key.disambiguated_data.data.get_opt_name().expect("module without name") | |
144 | }; | |
416331ca | 145 | |
c295e0f8 XL |
146 | Some(self.new_module( |
147 | parent, | |
148 | ModuleKind::Def(def_kind, def_id, name), | |
3c0e092e | 149 | self.cstore().module_expansion_untracked(def_id, &self.session), |
c295e0f8 XL |
150 | self.cstore().get_span_untracked(def_id, &self.session), |
151 | // FIXME: Account for `#[no_implicit_prelude]` attributes. | |
152 | parent.map_or(false, |module| module.no_implicit_prelude), | |
153 | )) | |
154 | } | |
155 | _ => None, | |
156 | } | |
157 | } else { | |
158 | None | |
159 | } | |
416331ca XL |
160 | } |
161 | ||
923072b8 | 162 | pub(crate) fn expn_def_scope(&mut self, expn_id: ExpnId) -> Module<'a> { |
c295e0f8 XL |
163 | match expn_id.expn_data().macro_def_id { |
164 | Some(def_id) => self.macro_def_scope(def_id), | |
165 | None => expn_id | |
166 | .as_local() | |
167 | .and_then(|expn_id| self.ast_transform_scopes.get(&expn_id)) | |
168 | .unwrap_or(&self.graph_root), | |
169 | } | |
136023e0 XL |
170 | } |
171 | ||
923072b8 | 172 | pub(crate) fn macro_def_scope(&mut self, def_id: DefId) -> Module<'a> { |
f9f354fc | 173 | if let Some(id) = def_id.as_local() { |
416331ca XL |
174 | self.local_macro_def_scopes[&id] |
175 | } else { | |
c295e0f8 | 176 | self.get_nearest_non_block_module(def_id) |
416331ca XL |
177 | } |
178 | } | |
179 | ||
923072b8 | 180 | pub(crate) fn get_macro(&mut self, res: Res) -> Option<MacroData> { |
416331ca | 181 | match res { |
5869c6ff | 182 | Res::Def(DefKind::Macro(..), def_id) => Some(self.get_macro_by_def_id(def_id)), |
923072b8 FG |
183 | Res::NonMacroAttr(_) => { |
184 | Some(MacroData { ext: self.non_macro_attr.clone(), macro_rules: false }) | |
185 | } | |
416331ca XL |
186 | _ => None, |
187 | } | |
188 | } | |
189 | ||
923072b8 FG |
190 | pub(crate) fn get_macro_by_def_id(&mut self, def_id: DefId) -> MacroData { |
191 | if let Some(macro_data) = self.macro_map.get(&def_id) { | |
192 | return macro_data.clone(); | |
416331ca XL |
193 | } |
194 | ||
923072b8 FG |
195 | let (ext, macro_rules) = match self.cstore().load_macro_untracked(def_id, &self.session) { |
196 | LoadedMacro::MacroDef(item, edition) => ( | |
197 | Lrc::new(self.compile_macro(&item, edition).0), | |
198 | matches!(item.kind, ItemKind::MacroDef(def) if def.macro_rules), | |
199 | ), | |
200 | LoadedMacro::ProcMacro(extz) => (Lrc::new(extz), false), | |
201 | }; | |
416331ca | 202 | |
923072b8 FG |
203 | let macro_data = MacroData { ext, macro_rules }; |
204 | self.macro_map.insert(def_id, macro_data.clone()); | |
205 | macro_data | |
416331ca XL |
206 | } |
207 | ||
923072b8 | 208 | pub(crate) fn build_reduced_graph( |
e1599b0c XL |
209 | &mut self, |
210 | fragment: &AstFragment, | |
e1599b0c | 211 | parent_scope: ParentScope<'a>, |
29967ef6 | 212 | ) -> MacroRulesScopeRef<'a> { |
f035d41b | 213 | collect_definitions(self, fragment, parent_scope.expansion); |
e1599b0c XL |
214 | let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope }; |
215 | fragment.visit_with(&mut visitor); | |
ba9703b0 | 216 | visitor.parent_scope.macro_rules |
e1599b0c XL |
217 | } |
218 | ||
923072b8 | 219 | pub(crate) fn build_reduced_graph_external(&mut self, module: Module<'a>) { |
5099ac24 | 220 | for child in self.cstore().module_children_untracked(module.def_id(), self.session) { |
29967ef6 XL |
221 | let parent_scope = ParentScope::module(module, self); |
222 | BuildReducedGraphVisitor { r: self, parent_scope } | |
e1599b0c | 223 | .build_reduced_graph_for_external_crate_res(child); |
416331ca | 224 | } |
416331ca XL |
225 | } |
226 | } | |
227 | ||
e1599b0c XL |
228 | struct BuildReducedGraphVisitor<'a, 'b> { |
229 | r: &'b mut Resolver<'a>, | |
230 | parent_scope: ParentScope<'a>, | |
231 | } | |
232 | ||
233 | impl<'a> AsMut<Resolver<'a>> for BuildReducedGraphVisitor<'a, '_> { | |
dfeec247 XL |
234 | fn as_mut(&mut self) -> &mut Resolver<'a> { |
235 | self.r | |
236 | } | |
416331ca XL |
237 | } |
238 | ||
239 | impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> { | |
240 | fn resolve_visibility(&mut self, vis: &ast::Visibility) -> ty::Visibility { | |
5e7ed085 | 241 | self.try_resolve_visibility(vis, true).unwrap_or_else(|err| { |
e74abb32 XL |
242 | self.r.report_vis_error(err); |
243 | ty::Visibility::Public | |
244 | }) | |
245 | } | |
246 | ||
5e7ed085 | 247 | fn try_resolve_visibility<'ast>( |
e74abb32 XL |
248 | &mut self, |
249 | vis: &'ast ast::Visibility, | |
5e7ed085 | 250 | finalize: bool, |
e74abb32 | 251 | ) -> Result<ty::Visibility, VisResolutionError<'ast>> { |
416331ca | 252 | let parent_scope = &self.parent_scope; |
1b1a35ee | 253 | match vis.kind { |
e74abb32 | 254 | ast::VisibilityKind::Public => Ok(ty::Visibility::Public), |
416331ca | 255 | ast::VisibilityKind::Inherited => { |
6a06907d XL |
256 | Ok(match self.parent_scope.module.kind { |
257 | // Any inherited visibility resolved directly inside an enum or trait | |
258 | // (i.e. variants, fields, and trait items) inherits from the visibility | |
259 | // of the enum or trait. | |
260 | ModuleKind::Def(DefKind::Enum | DefKind::Trait, def_id, _) => { | |
261 | self.r.visibilities[&def_id.expect_local()] | |
262 | } | |
263 | // Otherwise, the visibility is restricted to the nearest parent `mod` item. | |
c295e0f8 | 264 | _ => ty::Visibility::Restricted(self.parent_scope.module.nearest_parent_mod()), |
6a06907d | 265 | }) |
416331ca XL |
266 | } |
267 | ast::VisibilityKind::Restricted { ref path, id, .. } => { | |
04454e1e FG |
268 | // Make `PRIVATE_IN_PUBLIC` lint a hard error. |
269 | self.r.has_pub_restricted = true; | |
416331ca XL |
270 | // For visibilities we are not ready to provide correct implementation of "uniform |
271 | // paths" right now, so on 2018 edition we only allow module-relative paths for now. | |
272 | // On 2015 edition visibilities are resolved as crate-relative by default, | |
273 | // so we are prepending a root segment if necessary. | |
274 | let ident = path.segments.get(0).expect("empty path in visibility").ident; | |
275 | let crate_root = if ident.is_path_segment_keyword() { | |
276 | None | |
e74abb32 | 277 | } else if ident.span.rust_2015() { |
416331ca | 278 | Some(Segment::from_ident(Ident::new( |
dfeec247 XL |
279 | kw::PathRoot, |
280 | path.span.shrink_to_lo().with_ctxt(ident.span.ctxt()), | |
416331ca | 281 | ))) |
e74abb32 XL |
282 | } else { |
283 | return Err(VisResolutionError::Relative2018(ident.span, path)); | |
416331ca XL |
284 | }; |
285 | ||
dfeec247 XL |
286 | let segments = crate_root |
287 | .into_iter() | |
288 | .chain(path.segments.iter().map(|seg| seg.into())) | |
289 | .collect::<Vec<_>>(); | |
290 | let expected_found_error = |res| { | |
291 | Err(VisResolutionError::ExpectedFound( | |
292 | path.span, | |
293 | Segment::names_to_string(&segments), | |
294 | res, | |
295 | )) | |
296 | }; | |
416331ca XL |
297 | match self.r.resolve_path( |
298 | &segments, | |
299 | Some(TypeNS), | |
300 | parent_scope, | |
04454e1e FG |
301 | finalize.then(|| Finalize::new(id, path.span)), |
302 | None, | |
416331ca XL |
303 | ) { |
304 | PathResult::Module(ModuleOrUniformRoot::Module(module)) => { | |
305 | let res = module.res().expect("visibility resolved to unnamed block"); | |
5e7ed085 | 306 | if finalize { |
e74abb32 XL |
307 | self.r.record_partial_res(id, PartialRes::new(res)); |
308 | } | |
416331ca XL |
309 | if module.is_normal() { |
310 | if res == Res::Err { | |
e74abb32 | 311 | Ok(ty::Visibility::Public) |
416331ca XL |
312 | } else { |
313 | let vis = ty::Visibility::Restricted(res.def_id()); | |
314 | if self.r.is_accessible_from(vis, parent_scope.module) { | |
e74abb32 | 315 | Ok(vis) |
416331ca | 316 | } else { |
e74abb32 | 317 | Err(VisResolutionError::AncestorOnly(path.span)) |
416331ca XL |
318 | } |
319 | } | |
320 | } else { | |
e74abb32 | 321 | expected_found_error(res) |
416331ca XL |
322 | } |
323 | } | |
dfeec247 XL |
324 | PathResult::Module(..) => Err(VisResolutionError::ModuleOnly(path.span)), |
325 | PathResult::NonModule(partial_res) => { | |
326 | expected_found_error(partial_res.base_res()) | |
327 | } | |
328 | PathResult::Failed { span, label, suggestion, .. } => { | |
329 | Err(VisResolutionError::FailedToResolve(span, label, suggestion)) | |
330 | } | |
331 | PathResult::Indeterminate => Err(VisResolutionError::Indeterminate(path.span)), | |
416331ca XL |
332 | } |
333 | } | |
334 | } | |
335 | } | |
336 | ||
e74abb32 | 337 | fn insert_field_names_local(&mut self, def_id: DefId, vdata: &ast::VariantData) { |
dfeec247 XL |
338 | let field_names = vdata |
339 | .fields() | |
340 | .iter() | |
5869c6ff | 341 | .map(|field| respan(field.span, field.ident.map_or(kw::Empty, |ident| ident.name))) |
dfeec247 | 342 | .collect(); |
e74abb32 XL |
343 | self.insert_field_names(def_id, field_names); |
344 | } | |
345 | ||
f9f354fc | 346 | fn insert_field_names(&mut self, def_id: DefId, field_names: Vec<Spanned<Symbol>>) { |
3dfed10e | 347 | self.r.field_names.insert(def_id, field_names); |
416331ca XL |
348 | } |
349 | ||
1a4d82fc | 350 | fn block_needs_anonymous_module(&mut self, block: &Block) -> bool { |
7453a54e | 351 | // If any statements are items, we need to create an anonymous module |
29967ef6 XL |
352 | block |
353 | .stmts | |
354 | .iter() | |
355 | .any(|statement| matches!(statement.kind, StmtKind::Item(_) | StmtKind::MacCall(_))) | |
a7813a04 XL |
356 | } |
357 | ||
74b04a01 XL |
358 | // Add an import to the current module. |
359 | fn add_import( | |
416331ca XL |
360 | &mut self, |
361 | module_path: Vec<Segment>, | |
74b04a01 | 362 | kind: ImportKind<'a>, |
416331ca XL |
363 | span: Span, |
364 | id: NodeId, | |
365 | item: &ast::Item, | |
366 | root_span: Span, | |
367 | root_id: NodeId, | |
368 | vis: ty::Visibility, | |
369 | ) { | |
e1599b0c | 370 | let current_module = self.parent_scope.module; |
74b04a01 XL |
371 | let import = self.r.arenas.alloc_import(Import { |
372 | kind, | |
e1599b0c | 373 | parent_scope: self.parent_scope, |
416331ca XL |
374 | module_path, |
375 | imported_module: Cell::new(None), | |
416331ca XL |
376 | span, |
377 | id, | |
378 | use_span: item.span, | |
379 | use_span_with_attributes: item.span_with_attributes(), | |
380 | has_attributes: !item.attrs.is_empty(), | |
381 | root_span, | |
382 | root_id, | |
383 | vis: Cell::new(vis), | |
384 | used: Cell::new(false), | |
385 | }); | |
386 | ||
74b04a01 XL |
387 | self.r.indeterminate_imports.push(import); |
388 | match import.kind { | |
e74abb32 | 389 | // Don't add unresolved underscore imports to modules |
74b04a01 XL |
390 | ImportKind::Single { target: Ident { name: kw::Underscore, .. }, .. } => {} |
391 | ImportKind::Single { target, type_ns_only, .. } => { | |
dfeec247 XL |
392 | self.r.per_ns(|this, ns| { |
393 | if !type_ns_only || ns == TypeNS { | |
394 | let key = this.new_key(target, ns); | |
395 | let mut resolution = this.resolution(current_module, key).borrow_mut(); | |
74b04a01 | 396 | resolution.add_single_import(import); |
dfeec247 | 397 | } |
416331ca XL |
398 | }); |
399 | } | |
400 | // We don't add prelude imports to the globs since they only affect lexical scopes, | |
401 | // which are not relevant to import resolution. | |
74b04a01 XL |
402 | ImportKind::Glob { is_prelude: true, .. } => {} |
403 | ImportKind::Glob { .. } => current_module.globs.borrow_mut().push(import), | |
416331ca | 404 | _ => unreachable!(), |
c30ab7b3 SL |
405 | } |
406 | } | |
9e0c209e | 407 | |
b7449926 XL |
408 | fn build_reduced_graph_for_use_tree( |
409 | &mut self, | |
0bf4aa26 | 410 | // This particular use tree |
b7449926 XL |
411 | use_tree: &ast::UseTree, |
412 | id: NodeId, | |
13cf67c4 | 413 | parent_prefix: &[Segment], |
b7449926 | 414 | nested: bool, |
0bf4aa26 | 415 | // The whole `use` item |
b7449926 | 416 | item: &Item, |
0bf4aa26 XL |
417 | vis: ty::Visibility, |
418 | root_span: Span, | |
b7449926 | 419 | ) { |
dfeec247 XL |
420 | debug!( |
421 | "build_reduced_graph_for_use_tree(parent_prefix={:?}, use_tree={:?}, nested={})", | |
422 | parent_prefix, use_tree, nested | |
423 | ); | |
13cf67c4 | 424 | |
dfeec247 XL |
425 | let mut prefix_iter = parent_prefix |
426 | .iter() | |
427 | .cloned() | |
428 | .chain(use_tree.prefix.segments.iter().map(|seg| seg.into())) | |
429 | .peekable(); | |
13cf67c4 XL |
430 | |
431 | // On 2015 edition imports are resolved as crate-relative by default, | |
432 | // so prefixes are prepended with crate root segment if necessary. | |
433 | // The root is prepended lazily, when the first non-empty prefix or terminating glob | |
434 | // appears, so imports in braced groups can have roots prepended independently. | |
1b1a35ee | 435 | let is_glob = matches!(use_tree.kind, ast::UseTreeKind::Glob); |
13cf67c4 | 436 | let crate_root = match prefix_iter.peek() { |
532ac7d7 | 437 | Some(seg) if !seg.ident.is_path_segment_keyword() && seg.ident.span.rust_2015() => { |
13cf67c4 | 438 | Some(seg.ident.span.ctxt()) |
b7449926 | 439 | } |
dfeec247 | 440 | None if is_glob && use_tree.span.rust_2015() => Some(use_tree.span.ctxt()), |
13cf67c4 | 441 | _ => None, |
dfeec247 XL |
442 | } |
443 | .map(|ctxt| { | |
444 | Segment::from_ident(Ident::new( | |
445 | kw::PathRoot, | |
446 | use_tree.prefix.span.shrink_to_lo().with_ctxt(ctxt), | |
447 | )) | |
448 | }); | |
b7449926 | 449 | |
13cf67c4 XL |
450 | let prefix = crate_root.into_iter().chain(prefix_iter).collect::<Vec<_>>(); |
451 | debug!("build_reduced_graph_for_use_tree: prefix={:?}", prefix); | |
ff7c6d11 | 452 | |
13cf67c4 | 453 | let empty_for_self = |prefix: &[Segment]| { |
dfeec247 | 454 | prefix.is_empty() || prefix.len() == 1 && prefix[0].ident.name == kw::PathRoot |
0bf4aa26 | 455 | }; |
ff7c6d11 | 456 | match use_tree.kind { |
5099ac24 | 457 | ast::UseTreeKind::Simple(rename, id1, id2) => { |
e74abb32 | 458 | let mut ident = use_tree.ident(); |
b7449926 | 459 | let mut module_path = prefix; |
83c7162d | 460 | let mut source = module_path.pop().unwrap(); |
ff7c6d11 XL |
461 | let mut type_ns_only = false; |
462 | ||
04454e1e FG |
463 | self.r.visibilities.insert(self.r.local_def_id(id), vis); |
464 | if id1 != ast::DUMMY_NODE_ID { | |
465 | self.r.visibilities.insert(self.r.local_def_id(id1), vis); | |
466 | } | |
467 | if id2 != ast::DUMMY_NODE_ID { | |
468 | self.r.visibilities.insert(self.r.local_def_id(id2), vis); | |
469 | } | |
470 | ||
ff7c6d11 XL |
471 | if nested { |
472 | // Correctly handle `self` | |
dc9dc135 | 473 | if source.ident.name == kw::SelfLower { |
ff7c6d11 XL |
474 | type_ns_only = true; |
475 | ||
0bf4aa26 | 476 | if empty_for_self(&module_path) { |
416331ca | 477 | self.r.report_error( |
ff7c6d11 | 478 | use_tree.span, |
dfeec247 | 479 | ResolutionError::SelfImportOnlyInImportListWithNonEmptyPrefix, |
ff7c6d11 XL |
480 | ); |
481 | return; | |
482 | } | |
1a4d82fc | 483 | |
f9f354fc | 484 | // Replace `use foo::{ self };` with `use foo;` |
b7449926 | 485 | source = module_path.pop().unwrap(); |
0531ce1d | 486 | if rename.is_none() { |
13cf67c4 | 487 | ident = source.ident; |
ff7c6d11 | 488 | } |
85aaf69f | 489 | } |
ff7c6d11 XL |
490 | } else { |
491 | // Disallow `self` | |
dc9dc135 | 492 | if source.ident.name == kw::SelfLower { |
f9f354fc XL |
493 | let parent = module_path.last(); |
494 | ||
495 | let span = match parent { | |
496 | // only `::self` from `use foo::self as bar` | |
497 | Some(seg) => seg.ident.span.shrink_to_hi().to(source.ident.span), | |
498 | None => source.ident.span, | |
499 | }; | |
500 | let span_with_rename = match rename { | |
501 | // only `self as bar` from `use foo::self as bar` | |
502 | Some(rename) => source.ident.span.to(rename.span), | |
503 | None => source.ident.span, | |
504 | }; | |
416331ca | 505 | self.r.report_error( |
f9f354fc XL |
506 | span, |
507 | ResolutionError::SelfImportsOnlyAllowedWithin { | |
508 | root: parent.is_none(), | |
509 | span_with_rename, | |
510 | }, | |
416331ca | 511 | ); |
f9f354fc XL |
512 | |
513 | // Error recovery: replace `use foo::self;` with `use foo;` | |
514 | if let Some(parent) = module_path.pop() { | |
515 | source = parent; | |
516 | if rename.is_none() { | |
517 | ident = source.ident; | |
518 | } | |
519 | } | |
85aaf69f | 520 | } |
85aaf69f | 521 | |
ff7c6d11 | 522 | // Disallow `use $crate;` |
dc9dc135 | 523 | if source.ident.name == kw::DollarCrate && module_path.is_empty() { |
416331ca | 524 | let crate_root = self.r.resolve_crate_root(source.ident); |
ff7c6d11 | 525 | let crate_name = match crate_root.kind { |
48663c56 | 526 | ModuleKind::Def(.., name) => name, |
ff7c6d11 XL |
527 | ModuleKind::Block(..) => unreachable!(), |
528 | }; | |
b7449926 | 529 | // HACK(eddyb) unclear how good this is, but keeping `$crate` |
5869c6ff | 530 | // in `source` breaks `src/test/ui/imports/import-crate-var.rs`, |
b7449926 | 531 | // while the current crate doesn't have a valid `crate_name`. |
5869c6ff | 532 | if crate_name != kw::Empty { |
b7449926 | 533 | // `crate_name` should not be interpreted as relative. |
04454e1e FG |
534 | module_path.push(Segment::from_ident_and_id( |
535 | Ident { name: kw::PathRoot, span: source.ident.span }, | |
536 | self.r.next_node_id(), | |
537 | )); | |
13cf67c4 | 538 | source.ident.name = crate_name; |
b7449926 | 539 | } |
0531ce1d | 540 | if rename.is_none() { |
ff7c6d11 | 541 | ident.name = crate_name; |
85aaf69f SL |
542 | } |
543 | ||
dfeec247 XL |
544 | self.r |
545 | .session | |
546 | .struct_span_err(item.span, "`$crate` may not be imported") | |
ff7c6d11 | 547 | .emit(); |
85aaf69f | 548 | } |
ff7c6d11 | 549 | } |
85aaf69f | 550 | |
dc9dc135 | 551 | if ident.name == kw::Crate { |
dfeec247 XL |
552 | self.r.session.span_err( |
553 | ident.span, | |
b7449926 | 554 | "crate root imports need to be explicitly named: \ |
dfeec247 XL |
555 | `use crate as name;`", |
556 | ); | |
b7449926 XL |
557 | } |
558 | ||
74b04a01 | 559 | let kind = ImportKind::Single { |
13cf67c4 | 560 | source: source.ident, |
69743fb6 XL |
561 | target: ident, |
562 | source_bindings: PerNS { | |
416331ca XL |
563 | type_ns: Cell::new(Err(Determinacy::Undetermined)), |
564 | value_ns: Cell::new(Err(Determinacy::Undetermined)), | |
565 | macro_ns: Cell::new(Err(Determinacy::Undetermined)), | |
83c7162d | 566 | }, |
69743fb6 XL |
567 | target_bindings: PerNS { |
568 | type_ns: Cell::new(None), | |
569 | value_ns: Cell::new(None), | |
570 | macro_ns: Cell::new(None), | |
571 | }, | |
ff7c6d11 | 572 | type_ns_only, |
9fa01778 | 573 | nested, |
5099ac24 | 574 | additional_ids: (id1, id2), |
ff7c6d11 | 575 | }; |
5099ac24 | 576 | |
74b04a01 | 577 | self.add_import( |
94b46f34 | 578 | module_path, |
74b04a01 | 579 | kind, |
94b46f34 XL |
580 | use_tree.span, |
581 | id, | |
9fa01778 | 582 | item, |
0bf4aa26 XL |
583 | root_span, |
584 | item.id, | |
94b46f34 | 585 | vis, |
ff7c6d11 XL |
586 | ); |
587 | } | |
588 | ast::UseTreeKind::Glob => { | |
74b04a01 | 589 | let kind = ImportKind::Glob { |
3dfed10e | 590 | is_prelude: self.r.session.contains_name(&item.attrs, sym::prelude_import), |
ff7c6d11 XL |
591 | max_vis: Cell::new(ty::Visibility::Invisible), |
592 | }; | |
04454e1e | 593 | self.r.visibilities.insert(self.r.local_def_id(id), vis); |
74b04a01 | 594 | self.add_import(prefix, kind, use_tree.span, id, item, root_span, item.id, vis); |
ff7c6d11 XL |
595 | } |
596 | ast::UseTreeKind::Nested(ref items) => { | |
ff7c6d11 | 597 | // Ensure there is at most one `self` in the list |
dfeec247 XL |
598 | let self_spans = items |
599 | .iter() | |
600 | .filter_map(|&(ref use_tree, _)| { | |
601 | if let ast::UseTreeKind::Simple(..) = use_tree.kind { | |
602 | if use_tree.ident().name == kw::SelfLower { | |
603 | return Some(use_tree.span); | |
604 | } | |
85aaf69f | 605 | } |
ff7c6d11 | 606 | |
dfeec247 XL |
607 | None |
608 | }) | |
609 | .collect::<Vec<_>>(); | |
ff7c6d11 | 610 | if self_spans.len() > 1 { |
416331ca | 611 | let mut e = self.r.into_struct_error( |
ff7c6d11 | 612 | self_spans[0], |
dfeec247 XL |
613 | ResolutionError::SelfImportCanOnlyAppearOnceInTheList, |
614 | ); | |
ff7c6d11 XL |
615 | |
616 | for other_span in self_spans.iter().skip(1) { | |
617 | e.span_label(*other_span, "another `self` import appears here"); | |
85aaf69f | 618 | } |
ff7c6d11 XL |
619 | |
620 | e.emit(); | |
85aaf69f | 621 | } |
ff7c6d11 XL |
622 | |
623 | for &(ref tree, id) in items { | |
624 | self.build_reduced_graph_for_use_tree( | |
0bf4aa26 | 625 | // This particular use tree |
dfeec247 | 626 | tree, id, &prefix, true, // The whole `use` item |
416331ca | 627 | item, vis, root_span, |
0bf4aa26 XL |
628 | ); |
629 | } | |
630 | ||
631 | // Empty groups `a::b::{}` are turned into synthetic `self` imports | |
dc9dc135 | 632 | // `a::b::c::{self as _}`, so that their prefixes are correctly |
0bf4aa26 XL |
633 | // resolved and checked for privacy/stability/etc. |
634 | if items.is_empty() && !empty_for_self(&prefix) { | |
13cf67c4 | 635 | let new_span = prefix[prefix.len() - 1].ident.span; |
0bf4aa26 | 636 | let tree = ast::UseTree { |
dfeec247 | 637 | prefix: ast::Path::from_ident(Ident::new(kw::SelfLower, new_span)), |
0bf4aa26 | 638 | kind: ast::UseTreeKind::Simple( |
dc9dc135 | 639 | Some(Ident::new(kw::Underscore, new_span)), |
0bf4aa26 XL |
640 | ast::DUMMY_NODE_ID, |
641 | ast::DUMMY_NODE_ID, | |
642 | ), | |
643 | span: use_tree.span, | |
644 | }; | |
645 | self.build_reduced_graph_for_use_tree( | |
646 | // This particular use tree | |
dfeec247 XL |
647 | &tree, |
648 | id, | |
649 | &prefix, | |
650 | true, | |
0bf4aa26 | 651 | // The whole `use` item |
dfeec247 XL |
652 | item, |
653 | ty::Visibility::Invisible, | |
654 | root_span, | |
ff7c6d11 XL |
655 | ); |
656 | } | |
657 | } | |
658 | } | |
659 | } | |
660 | ||
661 | /// Constructs the reduced graph for one item. | |
e1599b0c | 662 | fn build_reduced_graph_for_item(&mut self, item: &'b Item) { |
416331ca | 663 | let parent_scope = &self.parent_scope; |
0bf4aa26 XL |
664 | let parent = parent_scope.module; |
665 | let expansion = parent_scope.expansion; | |
e74abb32 | 666 | let ident = item.ident; |
ff7c6d11 XL |
667 | let sp = item.span; |
668 | let vis = self.resolve_visibility(&item.vis); | |
29967ef6 XL |
669 | let local_def_id = self.r.local_def_id(item.id); |
670 | let def_id = local_def_id.to_def_id(); | |
671 | ||
672 | self.r.visibilities.insert(local_def_id, vis); | |
ff7c6d11 | 673 | |
e74abb32 | 674 | match item.kind { |
ff7c6d11 | 675 | ItemKind::Use(ref use_tree) => { |
ff7c6d11 | 676 | self.build_reduced_graph_for_use_tree( |
0bf4aa26 | 677 | // This particular use tree |
dfeec247 XL |
678 | use_tree, |
679 | item.id, | |
680 | &[], | |
681 | false, | |
0bf4aa26 | 682 | // The whole `use` item |
dfeec247 XL |
683 | item, |
684 | vis, | |
685 | use_tree.span, | |
ff7c6d11 | 686 | ); |
85aaf69f SL |
687 | } |
688 | ||
0531ce1d | 689 | ItemKind::ExternCrate(orig_name) => { |
a2a8927a XL |
690 | self.build_reduced_graph_for_extern_crate( |
691 | orig_name, | |
692 | item, | |
693 | local_def_id, | |
694 | vis, | |
695 | parent, | |
696 | ); | |
85aaf69f SL |
697 | } |
698 | ||
a7813a04 | 699 | ItemKind::Mod(..) => { |
c295e0f8 XL |
700 | let module = self.r.new_module( |
701 | Some(parent), | |
702 | ModuleKind::Def(DefKind::Mod, def_id, ident.name), | |
703 | expansion.to_expn_id(), | |
704 | item.span, | |
705 | parent.no_implicit_prelude | |
706 | || self.r.session.contains_name(&item.attrs, sym::no_implicit_prelude), | |
707 | ); | |
416331ca | 708 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
9e0c209e SL |
709 | |
710 | // Descend into the module. | |
416331ca | 711 | self.parent_scope.module = module; |
1a4d82fc JJ |
712 | } |
713 | ||
1a4d82fc | 714 | // These items live in the value namespace. |
5e7ed085 FG |
715 | ItemKind::Static(_, mt, _) => { |
716 | let res = Res::Def(DefKind::Static(mt), def_id); | |
416331ca | 717 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
1a4d82fc | 718 | } |
9e0c209e | 719 | ItemKind::Const(..) => { |
29967ef6 | 720 | let res = Res::Def(DefKind::Const, def_id); |
416331ca | 721 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
1a4d82fc | 722 | } |
9e0c209e | 723 | ItemKind::Fn(..) => { |
29967ef6 | 724 | let res = Res::Def(DefKind::Fn, def_id); |
416331ca | 725 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
8faf50e0 XL |
726 | |
727 | // Functions introducing procedural macros reserve a slot | |
728 | // in the macro namespace as well (see #52225). | |
416331ca | 729 | self.define_macro(item); |
1a4d82fc JJ |
730 | } |
731 | ||
732 | // These items live in the type namespace. | |
f035d41b | 733 | ItemKind::TyAlias(..) => { |
29967ef6 | 734 | let res = Res::Def(DefKind::TyAlias, def_id); |
416331ca | 735 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
8faf50e0 XL |
736 | } |
737 | ||
e1599b0c | 738 | ItemKind::Enum(_, _) => { |
dfeec247 | 739 | let module = self.r.new_module( |
c295e0f8 XL |
740 | Some(parent), |
741 | ModuleKind::Def(DefKind::Enum, def_id, ident.name), | |
136023e0 | 742 | expansion.to_expn_id(), |
dfeec247 | 743 | item.span, |
c295e0f8 | 744 | parent.no_implicit_prelude, |
dfeec247 | 745 | ); |
416331ca | 746 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
e1599b0c | 747 | self.parent_scope.module = module; |
1a4d82fc JJ |
748 | } |
749 | ||
ff7c6d11 | 750 | ItemKind::TraitAlias(..) => { |
29967ef6 | 751 | let res = Res::Def(DefKind::TraitAlias, def_id); |
416331ca | 752 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
ff7c6d11 XL |
753 | } |
754 | ||
1a4d82fc | 755 | // These items live in both the type and value namespaces. |
e74abb32 | 756 | ItemKind::Struct(ref vdata, _) => { |
1a4d82fc | 757 | // Define a name in the type namespace. |
48663c56 | 758 | let res = Res::Def(DefKind::Struct, def_id); |
416331ca | 759 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
1a4d82fc | 760 | |
abe05a73 | 761 | // Record field names for error reporting. |
e74abb32 | 762 | self.insert_field_names_local(def_id, vdata); |
8bb4bdeb XL |
763 | |
764 | // If this is a tuple or unit struct, define a name | |
765 | // in the value namespace as well. | |
e74abb32 | 766 | if let Some(ctor_node_id) = vdata.ctor_id() { |
e74abb32 XL |
767 | // If the structure is marked as non_exhaustive then lower the visibility |
768 | // to within the crate. | |
ba9703b0 | 769 | let mut ctor_vis = if vis == ty::Visibility::Public |
3dfed10e | 770 | && self.r.session.contains_name(&item.attrs, sym::non_exhaustive) |
dfeec247 | 771 | { |
04454e1e | 772 | ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id()) |
ba9703b0 XL |
773 | } else { |
774 | vis | |
775 | }; | |
776 | ||
1b1a35ee XL |
777 | let mut ret_fields = Vec::with_capacity(vdata.fields().len()); |
778 | ||
e74abb32 XL |
779 | for field in vdata.fields() { |
780 | // NOTE: The field may be an expansion placeholder, but expansion sets | |
781 | // correct visibilities for unnamed field placeholders specifically, so the | |
782 | // constructor visibility should still be determined correctly. | |
1b1a35ee | 783 | let field_vis = self |
5e7ed085 | 784 | .try_resolve_visibility(&field.vis, false) |
1b1a35ee XL |
785 | .unwrap_or(ty::Visibility::Public); |
786 | if ctor_vis.is_at_least(field_vis, &*self.r) { | |
787 | ctor_vis = field_vis; | |
e74abb32 | 788 | } |
1b1a35ee | 789 | ret_fields.push(field_vis); |
e74abb32 | 790 | } |
29967ef6 | 791 | let ctor_def_id = self.r.local_def_id(ctor_node_id); |
48663c56 | 792 | let ctor_res = Res::Def( |
e74abb32 | 793 | DefKind::Ctor(CtorOf::Struct, CtorKind::from_ast(vdata)), |
29967ef6 | 794 | ctor_def_id.to_def_id(), |
48663c56 | 795 | ); |
416331ca | 796 | self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, sp, expansion)); |
29967ef6 XL |
797 | self.r.visibilities.insert(ctor_def_id, ctor_vis); |
798 | ||
1b1a35ee | 799 | self.r.struct_constructors.insert(def_id, (ctor_res, ctor_vis, ret_fields)); |
8bb4bdeb | 800 | } |
1a4d82fc JJ |
801 | } |
802 | ||
9e0c209e | 803 | ItemKind::Union(ref vdata, _) => { |
e74abb32 | 804 | let res = Res::Def(DefKind::Union, def_id); |
416331ca | 805 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
1a4d82fc | 806 | |
c30ab7b3 | 807 | // Record field names for error reporting. |
e74abb32 | 808 | self.insert_field_names_local(def_id, vdata); |
416331ca | 809 | } |
1a4d82fc | 810 | |
9e0c209e | 811 | ItemKind::Trait(..) => { |
9e0c209e | 812 | // Add all the items within to a new module. |
dfeec247 | 813 | let module = self.r.new_module( |
c295e0f8 XL |
814 | Some(parent), |
815 | ModuleKind::Def(DefKind::Trait, def_id, ident.name), | |
136023e0 | 816 | expansion.to_expn_id(), |
dfeec247 | 817 | item.span, |
c295e0f8 | 818 | parent.no_implicit_prelude, |
dfeec247 | 819 | ); |
416331ca XL |
820 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
821 | self.parent_scope.module = module; | |
1a4d82fc | 822 | } |
ff7c6d11 | 823 | |
e74abb32 | 824 | // These items do not add names to modules. |
3c0e092e | 825 | ItemKind::Impl(box Impl { of_trait: Some(..), .. }) => { |
29967ef6 XL |
826 | self.r.trait_impl_items.insert(local_def_id); |
827 | } | |
dfeec247 | 828 | ItemKind::Impl { .. } | ItemKind::ForeignMod(..) | ItemKind::GlobalAsm(..) => {} |
e74abb32 | 829 | |
ba9703b0 | 830 | ItemKind::MacroDef(..) | ItemKind::MacCall(_) => unreachable!(), |
1a4d82fc JJ |
831 | } |
832 | } | |
833 | ||
a2a8927a XL |
834 | fn build_reduced_graph_for_extern_crate( |
835 | &mut self, | |
836 | orig_name: Option<Symbol>, | |
837 | item: &Item, | |
838 | local_def_id: LocalDefId, | |
839 | vis: ty::Visibility, | |
840 | parent: Module<'a>, | |
841 | ) { | |
842 | let ident = item.ident; | |
843 | let sp = item.span; | |
844 | let parent_scope = self.parent_scope; | |
845 | let expansion = parent_scope.expansion; | |
846 | ||
847 | let (used, module, binding) = if orig_name.is_none() && ident.name == kw::SelfLower { | |
848 | self.r | |
849 | .session | |
850 | .struct_span_err(item.span, "`extern crate self;` requires renaming") | |
851 | .span_suggestion( | |
852 | item.span, | |
853 | "rename the `self` crate to be able to import it", | |
04454e1e | 854 | "extern crate self as name;", |
a2a8927a XL |
855 | Applicability::HasPlaceholders, |
856 | ) | |
857 | .emit(); | |
858 | return; | |
859 | } else if orig_name == Some(kw::SelfLower) { | |
860 | Some(self.r.graph_root) | |
861 | } else { | |
862 | self.r.crate_loader.process_extern_crate(item, &self.r.definitions, local_def_id).map( | |
863 | |crate_id| { | |
864 | self.r.extern_crate_map.insert(local_def_id, crate_id); | |
865 | self.r.expect_module(crate_id.as_def_id()) | |
866 | }, | |
867 | ) | |
868 | } | |
869 | .map(|module| { | |
870 | let used = self.process_macro_use_imports(item, module); | |
871 | let binding = | |
872 | (module, ty::Visibility::Public, sp, expansion).to_name_binding(self.r.arenas); | |
873 | (used, Some(ModuleOrUniformRoot::Module(module)), binding) | |
874 | }) | |
875 | .unwrap_or((true, None, self.r.dummy_binding)); | |
876 | let import = self.r.arenas.alloc_import(Import { | |
877 | kind: ImportKind::ExternCrate { source: orig_name, target: ident }, | |
878 | root_id: item.id, | |
879 | id: item.id, | |
880 | parent_scope: self.parent_scope, | |
881 | imported_module: Cell::new(module), | |
882 | has_attributes: !item.attrs.is_empty(), | |
883 | use_span_with_attributes: item.span_with_attributes(), | |
884 | use_span: item.span, | |
885 | root_span: item.span, | |
886 | span: item.span, | |
887 | module_path: Vec::new(), | |
888 | vis: Cell::new(vis), | |
889 | used: Cell::new(used), | |
890 | }); | |
891 | self.r.potentially_unused_imports.push(import); | |
892 | let imported_binding = self.r.import(binding, import); | |
893 | if ptr::eq(parent, self.r.graph_root) { | |
894 | if let Some(entry) = self.r.extern_prelude.get(&ident.normalize_to_macros_2_0()) { | |
895 | if expansion != LocalExpnId::ROOT | |
896 | && orig_name.is_some() | |
897 | && entry.extern_crate_item.is_none() | |
898 | { | |
899 | let msg = "macro-expanded `extern crate` items cannot \ | |
900 | shadow names passed with `--extern`"; | |
901 | self.r.session.span_err(item.span, msg); | |
902 | } | |
903 | } | |
904 | let entry = self.r.extern_prelude.entry(ident.normalize_to_macros_2_0()).or_insert( | |
905 | ExternPreludeEntry { extern_crate_item: None, introduced_by_item: true }, | |
906 | ); | |
907 | entry.extern_crate_item = Some(imported_binding); | |
908 | if orig_name.is_some() { | |
909 | entry.introduced_by_item = true; | |
910 | } | |
911 | } | |
912 | self.r.define(parent, ident, TypeNS, imported_binding); | |
913 | } | |
914 | ||
1a4d82fc | 915 | /// Constructs the reduced graph for one foreign item. |
416331ca | 916 | fn build_reduced_graph_for_foreign_item(&mut self, item: &ForeignItem) { |
29967ef6 XL |
917 | let local_def_id = self.r.local_def_id(item.id); |
918 | let def_id = local_def_id.to_def_id(); | |
919 | let (def_kind, ns) = match item.kind { | |
920 | ForeignItemKind::Fn(..) => (DefKind::Fn, ValueNS), | |
5e7ed085 | 921 | ForeignItemKind::Static(_, mt, _) => (DefKind::Static(mt), ValueNS), |
29967ef6 | 922 | ForeignItemKind::TyAlias(..) => (DefKind::ForeignTy, TypeNS), |
ba9703b0 | 923 | ForeignItemKind::MacCall(_) => unreachable!(), |
c34b1796 | 924 | }; |
416331ca XL |
925 | let parent = self.parent_scope.module; |
926 | let expansion = self.parent_scope.expansion; | |
476ff2be | 927 | let vis = self.resolve_visibility(&item.vis); |
29967ef6 | 928 | let res = Res::Def(def_kind, def_id); |
416331ca | 929 | self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion)); |
29967ef6 | 930 | self.r.visibilities.insert(local_def_id, vis); |
1a4d82fc JJ |
931 | } |
932 | ||
416331ca XL |
933 | fn build_reduced_graph_for_block(&mut self, block: &Block) { |
934 | let parent = self.parent_scope.module; | |
935 | let expansion = self.parent_scope.expansion; | |
1a4d82fc | 936 | if self.block_needs_anonymous_module(block) { |
dfeec247 | 937 | let module = self.r.new_module( |
c295e0f8 | 938 | Some(parent), |
dfeec247 | 939 | ModuleKind::Block(block.id), |
136023e0 | 940 | expansion.to_expn_id(), |
dfeec247 | 941 | block.span, |
c295e0f8 | 942 | parent.no_implicit_prelude, |
dfeec247 | 943 | ); |
416331ca XL |
944 | self.r.block_map.insert(block.id, module); |
945 | self.parent_scope.module = module; // Descend into the block. | |
1a4d82fc JJ |
946 | } |
947 | } | |
948 | ||
54a0048b | 949 | /// Builds the reduced graph for a single item in an external crate. |
5099ac24 | 950 | fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) { |
e1599b0c | 951 | let parent = self.parent_scope.module; |
5e7ed085 | 952 | let ModChild { ident, res, vis, span, macro_rules } = child; |
c295e0f8 | 953 | let res = res.expect_non_local(); |
3dfed10e | 954 | let expansion = self.parent_scope.expansion; |
e1599b0c | 955 | // Record primary definitions. |
48663c56 | 956 | match res { |
c295e0f8 XL |
957 | Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, def_id) => { |
958 | let module = self.r.expect_module(def_id); | |
e74abb32 | 959 | self.r.define(parent, ident, TypeNS, (module, vis, span, expansion)); |
c30ab7b3 | 960 | } |
ba9703b0 XL |
961 | Res::Def( |
962 | DefKind::Struct | |
963 | | DefKind::Union | |
964 | | DefKind::Variant | |
965 | | DefKind::TyAlias | |
966 | | DefKind::ForeignTy | |
967 | | DefKind::OpaqueTy | |
968 | | DefKind::TraitAlias | |
f035d41b | 969 | | DefKind::AssocTy, |
ba9703b0 XL |
970 | _, |
971 | ) | |
48663c56 | 972 | | Res::PrimTy(..) |
dfeec247 | 973 | | Res::ToolMod => self.r.define(parent, ident, TypeNS, (res, vis, span, expansion)), |
ba9703b0 XL |
974 | Res::Def( |
975 | DefKind::Fn | |
976 | | DefKind::AssocFn | |
5e7ed085 | 977 | | DefKind::Static(_) |
ba9703b0 XL |
978 | | DefKind::Const |
979 | | DefKind::AssocConst | |
980 | | DefKind::Ctor(..), | |
981 | _, | |
982 | ) => self.r.define(parent, ident, ValueNS, (res, vis, span, expansion)), | |
dfeec247 | 983 | Res::Def(DefKind::Macro(..), _) | Res::NonMacroAttr(..) => { |
5e7ed085 FG |
984 | if !macro_rules { |
985 | self.r.define(parent, ident, MacroNS, (res, vis, span, expansion)) | |
986 | } | |
dfeec247 | 987 | } |
f9f354fc XL |
988 | Res::Def( |
989 | DefKind::TyParam | |
990 | | DefKind::ConstParam | |
991 | | DefKind::ExternCrate | |
992 | | DefKind::Use | |
993 | | DefKind::ForeignMod | |
994 | | DefKind::AnonConst | |
3c0e092e | 995 | | DefKind::InlineConst |
f9f354fc XL |
996 | | DefKind::Field |
997 | | DefKind::LifetimeParam | |
998 | | DefKind::GlobalAsm | |
999 | | DefKind::Closure | |
1000 | | DefKind::Impl | |
1001 | | DefKind::Generator, | |
1002 | _, | |
1003 | ) | |
dfeec247 | 1004 | | Res::Local(..) |
5099ac24 | 1005 | | Res::SelfTy { .. } |
dfeec247 XL |
1006 | | Res::SelfCtor(..) |
1007 | | Res::Err => bug!("unexpected resolution: {:?}", res), | |
e1599b0c XL |
1008 | } |
1009 | // Record some extra data for better diagnostics. | |
e74abb32 | 1010 | let cstore = self.r.cstore(); |
e1599b0c | 1011 | match res { |
17df50a5 | 1012 | Res::Def(DefKind::Struct, def_id) => { |
5099ac24 FG |
1013 | let field_names = |
1014 | cstore.struct_field_names_untracked(def_id, self.r.session).collect(); | |
17df50a5 XL |
1015 | let ctor = cstore.ctor_def_id_and_kind_untracked(def_id); |
1016 | if let Some((ctor_def_id, ctor_kind)) = ctor { | |
1017 | let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id); | |
1018 | let ctor_vis = cstore.visibility_untracked(ctor_def_id); | |
5099ac24 FG |
1019 | let field_visibilities = |
1020 | cstore.struct_field_visibilities_untracked(def_id).collect(); | |
17df50a5 XL |
1021 | self.r |
1022 | .struct_constructors | |
1023 | .insert(def_id, (ctor_res, ctor_vis, field_visibilities)); | |
1024 | } | |
1025 | self.insert_field_names(def_id, field_names); | |
1026 | } | |
1027 | Res::Def(DefKind::Union, def_id) => { | |
5099ac24 FG |
1028 | let field_names = |
1029 | cstore.struct_field_names_untracked(def_id, self.r.session).collect(); | |
c30ab7b3 | 1030 | self.insert_field_names(def_id, field_names); |
9e0c209e | 1031 | } |
ba9703b0 | 1032 | Res::Def(DefKind::AssocFn, def_id) => { |
a2a8927a | 1033 | if cstore.fn_has_self_parameter_untracked(def_id) { |
e1599b0c XL |
1034 | self.r.has_self.insert(def_id); |
1035 | } | |
1036 | } | |
e1599b0c | 1037 | _ => {} |
1a4d82fc JJ |
1038 | } |
1039 | } | |
1040 | ||
ba9703b0 | 1041 | fn add_macro_use_binding( |
dfeec247 | 1042 | &mut self, |
f9f354fc | 1043 | name: Symbol, |
dfeec247 XL |
1044 | binding: &'a NameBinding<'a>, |
1045 | span: Span, | |
1046 | allow_shadowing: bool, | |
1047 | ) { | |
416331ca | 1048 | if self.r.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing { |
476ff2be SL |
1049 | let msg = format!("`{}` is already in scope", name); |
1050 | let note = | |
1051 | "macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)"; | |
416331ca | 1052 | self.r.session.struct_span_err(span, &msg).note(note).emit(); |
476ff2be SL |
1053 | } |
1054 | } | |
c30ab7b3 | 1055 | |
9fa01778 | 1056 | /// Returns `true` if we should consider the underlying `extern crate` to be used. |
ba9703b0 | 1057 | fn process_macro_use_imports(&mut self, item: &Item, module: Module<'a>) -> bool { |
0bf4aa26 XL |
1058 | let mut import_all = None; |
1059 | let mut single_imports = Vec::new(); | |
1060 | for attr in &item.attrs { | |
94222f64 | 1061 | if attr.has_name(sym::macro_use) { |
416331ca | 1062 | if self.parent_scope.module.parent.is_some() { |
dfeec247 XL |
1063 | struct_span_err!( |
1064 | self.r.session, | |
1065 | item.span, | |
1066 | E0468, | |
1067 | "an `extern crate` loading macros must be at the crate root" | |
1068 | ) | |
1069 | .emit(); | |
0bf4aa26 | 1070 | } |
e74abb32 | 1071 | if let ItemKind::ExternCrate(Some(orig_name)) = item.kind { |
dc9dc135 | 1072 | if orig_name == kw::SelfLower { |
dfeec247 XL |
1073 | self.r |
1074 | .session | |
1075 | .struct_span_err( | |
1076 | attr.span, | |
1077 | "`#[macro_use]` is not supported on `extern crate self`", | |
1078 | ) | |
1079 | .emit(); | |
a1dfa0c6 XL |
1080 | } |
1081 | } | |
5e7ed085 FG |
1082 | let ill_formed = |span| { |
1083 | struct_span_err!(self.r.session, span, E0466, "bad macro import").emit(); | |
1084 | }; | |
0bf4aa26 | 1085 | match attr.meta() { |
e74abb32 | 1086 | Some(meta) => match meta.kind { |
0bf4aa26 XL |
1087 | MetaItemKind::Word => { |
1088 | import_all = Some(meta.span); | |
1089 | break; | |
1090 | } | |
dfeec247 XL |
1091 | MetaItemKind::List(nested_metas) => { |
1092 | for nested_meta in nested_metas { | |
1093 | match nested_meta.ident() { | |
1094 | Some(ident) if nested_meta.is_word() => { | |
1095 | single_imports.push(ident) | |
1096 | } | |
1097 | _ => ill_formed(nested_meta.span()), | |
1098 | } | |
0bf4aa26 XL |
1099 | } |
1100 | } | |
1101 | MetaItemKind::NameValue(..) => ill_formed(meta.span), | |
dfeec247 | 1102 | }, |
532ac7d7 | 1103 | None => ill_formed(attr.span), |
0bf4aa26 XL |
1104 | } |
1105 | } | |
476ff2be | 1106 | } |
c30ab7b3 | 1107 | |
74b04a01 XL |
1108 | let macro_use_import = |this: &Self, span| { |
1109 | this.r.arenas.alloc_import(Import { | |
1110 | kind: ImportKind::MacroUse, | |
dfeec247 XL |
1111 | root_id: item.id, |
1112 | id: item.id, | |
1113 | parent_scope: this.parent_scope, | |
1114 | imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))), | |
dfeec247 XL |
1115 | use_span_with_attributes: item.span_with_attributes(), |
1116 | has_attributes: !item.attrs.is_empty(), | |
1117 | use_span: item.span, | |
1118 | root_span: span, | |
1119 | span, | |
1120 | module_path: Vec::new(), | |
04454e1e | 1121 | vis: Cell::new(ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id())), |
dfeec247 XL |
1122 | used: Cell::new(false), |
1123 | }) | |
1124 | }; | |
32a655c1 | 1125 | |
136023e0 | 1126 | let allow_shadowing = self.parent_scope.expansion == LocalExpnId::ROOT; |
0bf4aa26 | 1127 | if let Some(span) = import_all { |
74b04a01 XL |
1128 | let import = macro_use_import(self, span); |
1129 | self.r.potentially_unused_imports.push(import); | |
dfeec247 XL |
1130 | module.for_each_child(self, |this, ident, ns, binding| { |
1131 | if ns == MacroNS { | |
74b04a01 | 1132 | let imported_binding = this.r.import(binding, import); |
ba9703b0 | 1133 | this.add_macro_use_binding(ident.name, imported_binding, span, allow_shadowing); |
dfeec247 | 1134 | } |
476ff2be SL |
1135 | }); |
1136 | } else { | |
9fa01778 | 1137 | for ident in single_imports.iter().cloned() { |
04454e1e | 1138 | let result = self.r.maybe_resolve_ident_in_module( |
b7449926 XL |
1139 | ModuleOrUniformRoot::Module(module), |
1140 | ident, | |
1141 | MacroNS, | |
416331ca | 1142 | &self.parent_scope, |
b7449926 | 1143 | ); |
476ff2be | 1144 | if let Ok(binding) = result { |
74b04a01 XL |
1145 | let import = macro_use_import(self, ident.span); |
1146 | self.r.potentially_unused_imports.push(import); | |
1147 | let imported_binding = self.r.import(binding, import); | |
ba9703b0 | 1148 | self.add_macro_use_binding( |
dfeec247 XL |
1149 | ident.name, |
1150 | imported_binding, | |
1151 | ident.span, | |
1152 | allow_shadowing, | |
1153 | ); | |
c30ab7b3 | 1154 | } else { |
dfeec247 XL |
1155 | struct_span_err!(self.r.session, ident.span, E0469, "imported macro not found") |
1156 | .emit(); | |
c30ab7b3 SL |
1157 | } |
1158 | } | |
476ff2be | 1159 | } |
0bf4aa26 | 1160 | import_all.is_some() || !single_imports.is_empty() |
c30ab7b3 SL |
1161 | } |
1162 | ||
9fa01778 | 1163 | /// Returns `true` if this attribute list contains `macro_use`. |
c30ab7b3 SL |
1164 | fn contains_macro_use(&mut self, attrs: &[ast::Attribute]) -> bool { |
1165 | for attr in attrs { | |
94222f64 | 1166 | if attr.has_name(sym::macro_escape) { |
dfeec247 | 1167 | let msg = "`#[macro_escape]` is a deprecated synonym for `#[macro_use]`"; |
416331ca | 1168 | let mut err = self.r.session.struct_span_warn(attr.span, msg); |
476ff2be | 1169 | if let ast::AttrStyle::Inner = attr.style { |
dfeec247 | 1170 | err.help("try an outer attribute: `#[macro_use]`").emit(); |
c30ab7b3 SL |
1171 | } else { |
1172 | err.emit(); | |
1173 | } | |
94222f64 | 1174 | } else if !attr.has_name(sym::macro_use) { |
c30ab7b3 SL |
1175 | continue; |
1176 | } | |
1177 | ||
1178 | if !attr.is_word() { | |
dfeec247 | 1179 | self.r.session.span_err(attr.span, "arguments to `macro_use` are not allowed here"); |
c30ab7b3 SL |
1180 | } |
1181 | return true; | |
1182 | } | |
1183 | ||
1184 | false | |
1185 | } | |
1a4d82fc | 1186 | |
136023e0 | 1187 | fn visit_invoc(&mut self, id: NodeId) -> LocalExpnId { |
416331ca | 1188 | let invoc_id = id.placeholder_to_expn_id(); |
e1599b0c XL |
1189 | let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope); |
1190 | assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation"); | |
fc512014 XL |
1191 | invoc_id |
1192 | } | |
416331ca | 1193 | |
fc512014 XL |
1194 | /// Visit invocation in context in which it can emit a named item (possibly `macro_rules`) |
1195 | /// directly into its parent scope's module. | |
1196 | fn visit_invoc_in_module(&mut self, id: NodeId) -> MacroRulesScopeRef<'a> { | |
1197 | let invoc_id = self.visit_invoc(id); | |
1198 | self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id); | |
1199 | self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Invocation(invoc_id)) | |
416331ca XL |
1200 | } |
1201 | ||
3dfed10e XL |
1202 | fn proc_macro_stub(&self, item: &ast::Item) -> Option<(MacroKind, Ident, Span)> { |
1203 | if self.r.session.contains_name(&item.attrs, sym::proc_macro) { | |
416331ca | 1204 | return Some((MacroKind::Bang, item.ident, item.span)); |
3dfed10e | 1205 | } else if self.r.session.contains_name(&item.attrs, sym::proc_macro_attribute) { |
416331ca | 1206 | return Some((MacroKind::Attr, item.ident, item.span)); |
3dfed10e XL |
1207 | } else if let Some(attr) = self.r.session.find_by_name(&item.attrs, sym::proc_macro_derive) |
1208 | { | |
416331ca XL |
1209 | if let Some(nested_meta) = attr.meta_item_list().and_then(|list| list.get(0).cloned()) { |
1210 | if let Some(ident) = nested_meta.ident() { | |
1211 | return Some((MacroKind::Derive, ident, ident.span)); | |
1212 | } | |
1213 | } | |
1214 | } | |
1215 | None | |
1216 | } | |
1217 | ||
e74abb32 XL |
1218 | // Mark the given macro as unused unless its name starts with `_`. |
1219 | // Macro uses will remove items from this set, and the remaining | |
1220 | // items will be reported as `unused_macros`. | |
04454e1e FG |
1221 | fn insert_unused_macro( |
1222 | &mut self, | |
1223 | ident: Ident, | |
1224 | def_id: LocalDefId, | |
1225 | node_id: NodeId, | |
923072b8 | 1226 | rule_spans: &[(usize, Span)], |
04454e1e | 1227 | ) { |
74b04a01 | 1228 | if !ident.as_str().starts_with('_') { |
3c0e092e | 1229 | self.r.unused_macros.insert(def_id, (node_id, ident)); |
923072b8 FG |
1230 | for (rule_i, rule_span) in rule_spans.iter() { |
1231 | self.r.unused_macro_rules.insert((def_id, *rule_i), (ident, *rule_span)); | |
04454e1e | 1232 | } |
e74abb32 XL |
1233 | } |
1234 | } | |
1235 | ||
29967ef6 | 1236 | fn define_macro(&mut self, item: &ast::Item) -> MacroRulesScopeRef<'a> { |
e74abb32 | 1237 | let parent_scope = self.parent_scope; |
416331ca | 1238 | let expansion = parent_scope.expansion; |
f035d41b | 1239 | let def_id = self.r.local_def_id(item.id); |
04454e1e | 1240 | let (ext, ident, span, macro_rules, rule_spans) = match &item.kind { |
416331ca | 1241 | ItemKind::MacroDef(def) => { |
04454e1e FG |
1242 | let (ext, rule_spans) = self.r.compile_macro(item, self.r.session.edition()); |
1243 | let ext = Lrc::new(ext); | |
1244 | (ext, item.ident, item.span, def.macro_rules, rule_spans) | |
416331ca | 1245 | } |
3dfed10e | 1246 | ItemKind::Fn(..) => match self.proc_macro_stub(item) { |
416331ca | 1247 | Some((macro_kind, ident, span)) => { |
f9f354fc | 1248 | self.r.proc_macro_stubs.insert(def_id); |
04454e1e | 1249 | (self.r.dummy_ext(macro_kind), ident, span, false, Vec::new()) |
416331ca | 1250 | } |
ba9703b0 | 1251 | None => return parent_scope.macro_rules, |
dfeec247 | 1252 | }, |
416331ca XL |
1253 | _ => unreachable!(), |
1254 | }; | |
1255 | ||
f9f354fc | 1256 | let res = Res::Def(DefKind::Macro(ext.macro_kind()), def_id.to_def_id()); |
923072b8 | 1257 | self.r.macro_map.insert(def_id.to_def_id(), MacroData { ext, macro_rules }); |
f9f354fc | 1258 | self.r.local_macro_def_scopes.insert(def_id, parent_scope.module); |
416331ca | 1259 | |
cdc7bbd5 | 1260 | if macro_rules { |
ba9703b0 | 1261 | let ident = ident.normalize_to_macros_2_0(); |
416331ca | 1262 | self.r.macro_names.insert(ident); |
cdc7bbd5 | 1263 | let is_macro_export = self.r.session.contains_name(&item.attrs, sym::macro_export); |
416331ca XL |
1264 | let vis = if is_macro_export { |
1265 | ty::Visibility::Public | |
1266 | } else { | |
04454e1e | 1267 | ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id()) |
416331ca XL |
1268 | }; |
1269 | let binding = (res, vis, span, expansion).to_name_binding(self.r.arenas); | |
1270 | self.r.set_binding_parent_module(binding, parent_scope.module); | |
416331ca XL |
1271 | if is_macro_export { |
1272 | let module = self.r.graph_root; | |
dfeec247 | 1273 | self.r.define(module, ident, MacroNS, (res, vis, span, expansion, IsMacroExport)); |
416331ca XL |
1274 | } else { |
1275 | self.r.check_reserved_macro_name(ident, res); | |
04454e1e | 1276 | self.insert_unused_macro(ident, def_id, item.id, &rule_spans); |
416331ca | 1277 | } |
29967ef6 | 1278 | self.r.visibilities.insert(def_id, vis); |
04454e1e | 1279 | let scope = self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Binding( |
29967ef6 XL |
1280 | self.r.arenas.alloc_macro_rules_binding(MacroRulesBinding { |
1281 | parent_macro_rules_scope: parent_scope.macro_rules, | |
1282 | binding, | |
1283 | ident, | |
1284 | }), | |
04454e1e FG |
1285 | )); |
1286 | self.r.macro_rules_scopes.insert(def_id, scope); | |
1287 | scope | |
416331ca XL |
1288 | } else { |
1289 | let module = parent_scope.module; | |
ba9703b0 XL |
1290 | let vis = match item.kind { |
1291 | // Visibilities must not be resolved non-speculatively twice | |
1292 | // and we already resolved this one as a `fn` item visibility. | |
5e7ed085 FG |
1293 | ItemKind::Fn(..) => { |
1294 | self.try_resolve_visibility(&item.vis, false).unwrap_or(ty::Visibility::Public) | |
1295 | } | |
ba9703b0 XL |
1296 | _ => self.resolve_visibility(&item.vis), |
1297 | }; | |
416331ca | 1298 | if vis != ty::Visibility::Public { |
04454e1e | 1299 | self.insert_unused_macro(ident, def_id, item.id, &rule_spans); |
416331ca XL |
1300 | } |
1301 | self.r.define(module, ident, MacroNS, (res, vis, span, expansion)); | |
29967ef6 | 1302 | self.r.visibilities.insert(def_id, vis); |
ba9703b0 | 1303 | self.parent_scope.macro_rules |
416331ca | 1304 | } |
c30ab7b3 SL |
1305 | } |
1306 | } | |
1307 | ||
1308 | macro_rules! method { | |
1309 | ($visit:ident: $ty:ty, $invoc:path, $walk:ident) => { | |
416331ca | 1310 | fn $visit(&mut self, node: &'b $ty) { |
e74abb32 | 1311 | if let $invoc(..) = node.kind { |
c30ab7b3 SL |
1312 | self.visit_invoc(node.id); |
1313 | } else { | |
1314 | visit::$walk(self, node); | |
1315 | } | |
1316 | } | |
ba9703b0 | 1317 | }; |
1a4d82fc JJ |
1318 | } |
1319 | ||
416331ca | 1320 | impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> { |
ba9703b0 XL |
1321 | method!(visit_expr: ast::Expr, ast::ExprKind::MacCall, walk_expr); |
1322 | method!(visit_pat: ast::Pat, ast::PatKind::MacCall, walk_pat); | |
1323 | method!(visit_ty: ast::Ty, ast::TyKind::MacCall, walk_ty); | |
c30ab7b3 | 1324 | |
416331ca | 1325 | fn visit_item(&mut self, item: &'b Item) { |
5869c6ff XL |
1326 | let orig_module_scope = self.parent_scope.module; |
1327 | self.parent_scope.macro_rules = match item.kind { | |
8bb4bdeb | 1328 | ItemKind::MacroDef(..) => { |
5869c6ff XL |
1329 | let macro_rules_scope = self.define_macro(item); |
1330 | visit::walk_item(self, item); | |
1331 | macro_rules_scope | |
8bb4bdeb | 1332 | } |
ba9703b0 | 1333 | ItemKind::MacCall(..) => { |
5869c6ff XL |
1334 | let macro_rules_scope = self.visit_invoc_in_module(item.id); |
1335 | visit::walk_item(self, item); | |
1336 | macro_rules_scope | |
1337 | } | |
1338 | _ => { | |
1339 | let orig_macro_rules_scope = self.parent_scope.macro_rules; | |
1340 | self.build_reduced_graph_for_item(item); | |
1341 | visit::walk_item(self, item); | |
1342 | match item.kind { | |
1343 | ItemKind::Mod(..) if self.contains_macro_use(&item.attrs) => { | |
1344 | self.parent_scope.macro_rules | |
1345 | } | |
1346 | _ => orig_macro_rules_scope, | |
1347 | } | |
c30ab7b3 | 1348 | } |
c30ab7b3 | 1349 | }; |
5869c6ff | 1350 | self.parent_scope.module = orig_module_scope; |
c30ab7b3 SL |
1351 | } |
1352 | ||
416331ca | 1353 | fn visit_stmt(&mut self, stmt: &'b ast::Stmt) { |
ba9703b0 | 1354 | if let ast::StmtKind::MacCall(..) = stmt.kind { |
fc512014 | 1355 | self.parent_scope.macro_rules = self.visit_invoc_in_module(stmt.id); |
c30ab7b3 SL |
1356 | } else { |
1357 | visit::walk_stmt(self, stmt); | |
1358 | } | |
1a4d82fc JJ |
1359 | } |
1360 | ||
416331ca | 1361 | fn visit_foreign_item(&mut self, foreign_item: &'b ForeignItem) { |
ba9703b0 | 1362 | if let ForeignItemKind::MacCall(_) = foreign_item.kind { |
fc512014 | 1363 | self.visit_invoc_in_module(foreign_item.id); |
83c7162d XL |
1364 | return; |
1365 | } | |
1366 | ||
416331ca | 1367 | self.build_reduced_graph_for_foreign_item(foreign_item); |
c30ab7b3 | 1368 | visit::walk_foreign_item(self, foreign_item); |
1a4d82fc JJ |
1369 | } |
1370 | ||
416331ca XL |
1371 | fn visit_block(&mut self, block: &'b Block) { |
1372 | let orig_current_module = self.parent_scope.module; | |
ba9703b0 | 1373 | let orig_current_macro_rules_scope = self.parent_scope.macro_rules; |
416331ca | 1374 | self.build_reduced_graph_for_block(block); |
a7813a04 | 1375 | visit::walk_block(self, block); |
416331ca | 1376 | self.parent_scope.module = orig_current_module; |
ba9703b0 | 1377 | self.parent_scope.macro_rules = orig_current_macro_rules_scope; |
9e0c209e SL |
1378 | } |
1379 | ||
74b04a01 | 1380 | fn visit_assoc_item(&mut self, item: &'b AssocItem, ctxt: AssocCtxt) { |
ba9703b0 | 1381 | if let AssocItemKind::MacCall(_) = item.kind { |
fc512014 XL |
1382 | match ctxt { |
1383 | AssocCtxt::Trait => { | |
1384 | self.visit_invoc_in_module(item.id); | |
1385 | } | |
1386 | AssocCtxt::Impl => { | |
1387 | self.visit_invoc(item.id); | |
1388 | } | |
1389 | } | |
dfeec247 | 1390 | return; |
c30ab7b3 SL |
1391 | } |
1392 | ||
6a06907d | 1393 | let vis = self.resolve_visibility(&item.vis); |
29967ef6 XL |
1394 | let local_def_id = self.r.local_def_id(item.id); |
1395 | let def_id = local_def_id.to_def_id(); | |
74b04a01 | 1396 | |
6a06907d XL |
1397 | if !(ctxt == AssocCtxt::Impl |
1398 | && matches!(item.vis.kind, ast::VisibilityKind::Inherited) | |
1399 | && self | |
1400 | .r | |
1401 | .trait_impl_items | |
04454e1e | 1402 | .contains(&ty::DefIdTree::local_parent(&*self.r, local_def_id))) |
6a06907d XL |
1403 | { |
1404 | // Trait impl item visibility is inherited from its trait when not specified | |
1405 | // explicitly. In that case we cannot determine it here in early resolve, | |
1406 | // so we leave a hole in the visibility table to be filled later. | |
1407 | self.r.visibilities.insert(local_def_id, vis); | |
1408 | } | |
1409 | ||
1410 | if ctxt == AssocCtxt::Trait { | |
1411 | let (def_kind, ns) = match item.kind { | |
1412 | AssocItemKind::Const(..) => (DefKind::AssocConst, ValueNS), | |
3c0e092e | 1413 | AssocItemKind::Fn(box Fn { ref sig, .. }) => { |
6a06907d XL |
1414 | if sig.decl.has_self() { |
1415 | self.r.has_self.insert(def_id); | |
29967ef6 | 1416 | } |
6a06907d | 1417 | (DefKind::AssocFn, ValueNS) |
7cac9316 | 1418 | } |
6a06907d XL |
1419 | AssocItemKind::TyAlias(..) => (DefKind::AssocTy, TypeNS), |
1420 | AssocItemKind::MacCall(_) => bug!(), // handled above | |
1421 | }; | |
9e0c209e | 1422 | |
6a06907d XL |
1423 | let parent = self.parent_scope.module; |
1424 | let expansion = self.parent_scope.expansion; | |
1425 | let res = Res::Def(def_kind, def_id); | |
1426 | self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion)); | |
29967ef6 | 1427 | } |
9e0c209e | 1428 | |
74b04a01 | 1429 | visit::walk_assoc_item(self, item, ctxt); |
e74abb32 XL |
1430 | } |
1431 | ||
416331ca | 1432 | fn visit_attribute(&mut self, attr: &'b ast::Attribute) { |
60c5eb7d | 1433 | if !attr.is_doc_comment() && attr::is_builtin_attr(attr) { |
dfeec247 XL |
1434 | self.r |
1435 | .builtin_attrs | |
1436 | .push((attr.get_normal_item().path.segments[0].ident, self.parent_scope)); | |
b7449926 XL |
1437 | } |
1438 | visit::walk_attribute(self, attr); | |
1439 | } | |
e1599b0c XL |
1440 | |
1441 | fn visit_arm(&mut self, arm: &'b ast::Arm) { | |
1442 | if arm.is_placeholder { | |
1443 | self.visit_invoc(arm.id); | |
1444 | } else { | |
1445 | visit::walk_arm(self, arm); | |
1446 | } | |
1447 | } | |
1448 | ||
6a06907d | 1449 | fn visit_expr_field(&mut self, f: &'b ast::ExprField) { |
e1599b0c XL |
1450 | if f.is_placeholder { |
1451 | self.visit_invoc(f.id); | |
1452 | } else { | |
6a06907d | 1453 | visit::walk_expr_field(self, f); |
e1599b0c XL |
1454 | } |
1455 | } | |
1456 | ||
6a06907d | 1457 | fn visit_pat_field(&mut self, fp: &'b ast::PatField) { |
e1599b0c XL |
1458 | if fp.is_placeholder { |
1459 | self.visit_invoc(fp.id); | |
1460 | } else { | |
6a06907d | 1461 | visit::walk_pat_field(self, fp); |
e1599b0c XL |
1462 | } |
1463 | } | |
1464 | ||
1465 | fn visit_generic_param(&mut self, param: &'b ast::GenericParam) { | |
1466 | if param.is_placeholder { | |
1467 | self.visit_invoc(param.id); | |
1468 | } else { | |
1469 | visit::walk_generic_param(self, param); | |
1470 | } | |
1471 | } | |
1472 | ||
1473 | fn visit_param(&mut self, p: &'b ast::Param) { | |
1474 | if p.is_placeholder { | |
1475 | self.visit_invoc(p.id); | |
1476 | } else { | |
1477 | visit::walk_param(self, p); | |
1478 | } | |
1479 | } | |
1480 | ||
6a06907d | 1481 | fn visit_field_def(&mut self, sf: &'b ast::FieldDef) { |
e1599b0c XL |
1482 | if sf.is_placeholder { |
1483 | self.visit_invoc(sf.id); | |
1484 | } else { | |
29967ef6 XL |
1485 | let vis = self.resolve_visibility(&sf.vis); |
1486 | self.r.visibilities.insert(self.r.local_def_id(sf.id), vis); | |
6a06907d | 1487 | visit::walk_field_def(self, sf); |
e1599b0c XL |
1488 | } |
1489 | } | |
1490 | ||
1491 | // Constructs the reduced graph for one variant. Variants exist in the | |
1492 | // type and value namespaces. | |
1493 | fn visit_variant(&mut self, variant: &'b ast::Variant) { | |
1494 | if variant.is_placeholder { | |
fc512014 | 1495 | self.visit_invoc_in_module(variant.id); |
e1599b0c XL |
1496 | return; |
1497 | } | |
1498 | ||
1499 | let parent = self.parent_scope.module; | |
e1599b0c XL |
1500 | let expn_id = self.parent_scope.expansion; |
1501 | let ident = variant.ident; | |
1502 | ||
1503 | // Define a name in the type namespace. | |
29967ef6 XL |
1504 | let def_id = self.r.local_def_id(variant.id); |
1505 | let res = Res::Def(DefKind::Variant, def_id.to_def_id()); | |
6a06907d | 1506 | let vis = self.resolve_visibility(&variant.vis); |
e1599b0c | 1507 | self.r.define(parent, ident, TypeNS, (res, vis, variant.span, expn_id)); |
29967ef6 | 1508 | self.r.visibilities.insert(def_id, vis); |
e1599b0c | 1509 | |
29967ef6 XL |
1510 | // If the variant is marked as non_exhaustive then lower the visibility to within the crate. |
1511 | let ctor_vis = if vis == ty::Visibility::Public | |
1512 | && self.r.session.contains_name(&variant.attrs, sym::non_exhaustive) | |
1513 | { | |
04454e1e | 1514 | ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id()) |
29967ef6 XL |
1515 | } else { |
1516 | vis | |
1517 | }; | |
e1599b0c XL |
1518 | |
1519 | // Define a constructor name in the value namespace. | |
1520 | // Braced variants, unlike structs, generate unusable names in | |
1521 | // value namespace, they are reserved for possible future use. | |
1522 | // It's ok to use the variant's id as a ctor id since an | |
1523 | // error will be reported on any use of such resolution anyway. | |
1524 | let ctor_node_id = variant.data.ctor_id().unwrap_or(variant.id); | |
29967ef6 | 1525 | let ctor_def_id = self.r.local_def_id(ctor_node_id); |
e1599b0c | 1526 | let ctor_kind = CtorKind::from_ast(&variant.data); |
29967ef6 | 1527 | let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id.to_def_id()); |
e1599b0c | 1528 | self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, variant.span, expn_id)); |
29967ef6 XL |
1529 | if ctor_def_id != def_id { |
1530 | self.r.visibilities.insert(ctor_def_id, ctor_vis); | |
1531 | } | |
3dfed10e | 1532 | // Record field names for error reporting. |
29967ef6 | 1533 | self.insert_field_names_local(ctor_def_id.to_def_id(), &variant.data); |
e1599b0c XL |
1534 | |
1535 | visit::walk_variant(self, variant); | |
1536 | } | |
a2a8927a XL |
1537 | |
1538 | fn visit_crate(&mut self, krate: &'b ast::Crate) { | |
1539 | if krate.is_placeholder { | |
1540 | self.visit_invoc_in_module(krate.id); | |
1541 | } else { | |
1542 | visit::walk_crate(self, krate); | |
1543 | self.contains_macro_use(&krate.attrs); | |
1544 | } | |
1545 | } | |
1a4d82fc | 1546 | } |