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Commit | Line | Data |
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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}; |
487cf647 | 33 | use rustc_span::source_map::respan; |
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; | |
60c5eb7d | 39 | |
48663c56 XL |
40 | type Res = def::Res<NodeId>; |
41 | ||
f2b60f7d FG |
42 | impl<'a, Id: Into<DefId>> ToNameBinding<'a> |
43 | for (Module<'a>, ty::Visibility<Id>, Span, LocalExpnId) | |
44 | { | |
32a655c1 SL |
45 | fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
46 | arenas.alloc_name_binding(NameBinding { | |
476ff2be | 47 | kind: NameBindingKind::Module(self.0), |
0731742a | 48 | ambiguity: None, |
f2b60f7d | 49 | vis: self.1.to_def_id(), |
476ff2be SL |
50 | span: self.2, |
51 | expansion: self.3, | |
32a655c1 | 52 | }) |
7453a54e SL |
53 | } |
54 | } | |
55 | ||
f2b60f7d | 56 | impl<'a, Id: Into<DefId>> ToNameBinding<'a> for (Res, ty::Visibility<Id>, Span, LocalExpnId) { |
32a655c1 SL |
57 | fn to_name_binding(self, arenas: &'a ResolverArenas<'a>) -> &'a NameBinding<'a> { |
58 | arenas.alloc_name_binding(NameBinding { | |
487cf647 | 59 | kind: NameBindingKind::Res(self.0), |
0731742a | 60 | ambiguity: None, |
f2b60f7d | 61 | vis: self.1.to_def_id(), |
476ff2be SL |
62 | span: self.2, |
63 | expansion: self.3, | |
32a655c1 | 64 | }) |
7453a54e SL |
65 | } |
66 | } | |
67 | ||
9ffffee4 | 68 | impl<'a, 'tcx> Resolver<'a, 'tcx> { |
7453a54e SL |
69 | /// Defines `name` in namespace `ns` of module `parent` to be `def` if it is not yet defined; |
70 | /// otherwise, reports an error. | |
923072b8 | 71 | pub(crate) fn define<T>(&mut self, parent: Module<'a>, ident: Ident, ns: Namespace, def: T) |
dfeec247 XL |
72 | where |
73 | T: ToNameBinding<'a>, | |
5bcae85e | 74 | { |
32a655c1 | 75 | let binding = def.to_name_binding(self.arenas); |
e74abb32 XL |
76 | let key = self.new_key(ident, ns); |
77 | if let Err(old_binding) = self.try_define(parent, key, binding) { | |
32a655c1 | 78 | self.report_conflict(parent, ident, ns, old_binding, &binding); |
1a4d82fc JJ |
79 | } |
80 | } | |
81 | ||
29967ef6 | 82 | /// Walks up the tree of definitions starting at `def_id`, |
c295e0f8 XL |
83 | /// stopping at the first encountered module. |
84 | /// Parent block modules for arbitrary def-ids are not recorded for the local crate, | |
85 | /// and are not preserved in metadata for foreign crates, so block modules are never | |
86 | /// returned by this function. | |
87 | /// | |
88 | /// For the local crate ignoring block modules may be incorrect, so use this method with care. | |
89 | /// | |
90 | /// For foreign crates block modules can be ignored without introducing observable differences, | |
91 | /// moreover they has to be ignored right now because they are not kept in metadata. | |
92 | /// Foreign parent modules are used for resolving names used by foreign macros with def-site | |
93 | /// hygiene, therefore block module ignorability relies on macros with def-site hygiene and | |
94 | /// block module parents being unreachable from other crates. | |
95 | /// Reachable macros with block module parents exist due to `#[macro_export] macro_rules!`, | |
96 | /// but they cannot use def-site hygiene, so the assumption holds | |
97 | /// (<https://github.com/rust-lang/rust/pull/77984#issuecomment-712445508>). | |
9ffffee4 | 98 | pub(crate) fn get_nearest_non_block_module(&mut self, mut def_id: DefId) -> Module<'a> { |
c295e0f8 XL |
99 | loop { |
100 | match self.get_module(def_id) { | |
101 | Some(module) => return module, | |
923072b8 | 102 | None => def_id = self.parent(def_id), |
c295e0f8 | 103 | } |
29967ef6 | 104 | } |
29967ef6 XL |
105 | } |
106 | ||
9ffffee4 | 107 | pub(crate) fn expect_module(&mut self, def_id: DefId) -> Module<'a> { |
c295e0f8 XL |
108 | self.get_module(def_id).expect("argument `DefId` is not a module") |
109 | } | |
416331ca | 110 | |
c295e0f8 XL |
111 | /// If `def_id` refers to a module (in resolver's sense, i.e. a module item, crate root, enum, |
112 | /// or trait), then this function returns that module's resolver representation, otherwise it | |
113 | /// returns `None`. | |
923072b8 | 114 | pub(crate) fn get_module(&mut self, def_id: DefId) -> Option<Module<'a>> { |
c295e0f8 XL |
115 | if let module @ Some(..) = self.module_map.get(&def_id) { |
116 | return module.copied(); | |
416331ca XL |
117 | } |
118 | ||
c295e0f8 XL |
119 | if !def_id.is_local() { |
120 | let def_kind = self.cstore().def_kind(def_id); | |
121 | match def_kind { | |
122 | DefKind::Mod | DefKind::Enum | DefKind::Trait => { | |
123 | let def_key = self.cstore().def_key(def_id); | |
124 | let parent = def_key.parent.map(|index| { | |
125 | self.get_nearest_non_block_module(DefId { index, krate: def_id.krate }) | |
126 | }); | |
04454e1e FG |
127 | let name = if let Some(cnum) = def_id.as_crate_root() { |
128 | self.cstore().crate_name(cnum) | |
c295e0f8 XL |
129 | } else { |
130 | def_key.disambiguated_data.data.get_opt_name().expect("module without name") | |
131 | }; | |
416331ca | 132 | |
9ffffee4 FG |
133 | let expn_id = self.cstore().module_expansion_untracked(def_id, &self.tcx.sess); |
134 | let span = self.cstore().get_span_untracked(def_id, &self.tcx.sess); | |
c295e0f8 XL |
135 | Some(self.new_module( |
136 | parent, | |
137 | ModuleKind::Def(def_kind, def_id, name), | |
9ffffee4 FG |
138 | expn_id, |
139 | span, | |
c295e0f8 XL |
140 | // FIXME: Account for `#[no_implicit_prelude]` attributes. |
141 | parent.map_or(false, |module| module.no_implicit_prelude), | |
142 | )) | |
143 | } | |
144 | _ => None, | |
145 | } | |
146 | } else { | |
147 | None | |
148 | } | |
416331ca XL |
149 | } |
150 | ||
923072b8 | 151 | pub(crate) fn expn_def_scope(&mut self, expn_id: ExpnId) -> Module<'a> { |
c295e0f8 XL |
152 | match expn_id.expn_data().macro_def_id { |
153 | Some(def_id) => self.macro_def_scope(def_id), | |
154 | None => expn_id | |
155 | .as_local() | |
156 | .and_then(|expn_id| self.ast_transform_scopes.get(&expn_id)) | |
157 | .unwrap_or(&self.graph_root), | |
158 | } | |
136023e0 XL |
159 | } |
160 | ||
923072b8 | 161 | pub(crate) fn macro_def_scope(&mut self, def_id: DefId) -> Module<'a> { |
f9f354fc | 162 | if let Some(id) = def_id.as_local() { |
416331ca XL |
163 | self.local_macro_def_scopes[&id] |
164 | } else { | |
c295e0f8 | 165 | self.get_nearest_non_block_module(def_id) |
416331ca XL |
166 | } |
167 | } | |
168 | ||
923072b8 | 169 | pub(crate) fn get_macro(&mut self, res: Res) -> Option<MacroData> { |
416331ca | 170 | match res { |
5869c6ff | 171 | Res::Def(DefKind::Macro(..), def_id) => Some(self.get_macro_by_def_id(def_id)), |
923072b8 FG |
172 | Res::NonMacroAttr(_) => { |
173 | Some(MacroData { ext: self.non_macro_attr.clone(), macro_rules: false }) | |
174 | } | |
416331ca XL |
175 | _ => None, |
176 | } | |
177 | } | |
178 | ||
923072b8 FG |
179 | pub(crate) fn get_macro_by_def_id(&mut self, def_id: DefId) -> MacroData { |
180 | if let Some(macro_data) = self.macro_map.get(&def_id) { | |
181 | return macro_data.clone(); | |
416331ca XL |
182 | } |
183 | ||
9ffffee4 FG |
184 | let load_macro_untracked = self.cstore().load_macro_untracked(def_id, &self.tcx.sess); |
185 | let (ext, macro_rules) = match load_macro_untracked { | |
923072b8 FG |
186 | LoadedMacro::MacroDef(item, edition) => ( |
187 | Lrc::new(self.compile_macro(&item, edition).0), | |
188 | matches!(item.kind, ItemKind::MacroDef(def) if def.macro_rules), | |
189 | ), | |
190 | LoadedMacro::ProcMacro(extz) => (Lrc::new(extz), false), | |
191 | }; | |
416331ca | 192 | |
923072b8 FG |
193 | let macro_data = MacroData { ext, macro_rules }; |
194 | self.macro_map.insert(def_id, macro_data.clone()); | |
195 | macro_data | |
416331ca XL |
196 | } |
197 | ||
923072b8 | 198 | pub(crate) fn build_reduced_graph( |
e1599b0c XL |
199 | &mut self, |
200 | fragment: &AstFragment, | |
e1599b0c | 201 | parent_scope: ParentScope<'a>, |
29967ef6 | 202 | ) -> MacroRulesScopeRef<'a> { |
f035d41b | 203 | collect_definitions(self, fragment, parent_scope.expansion); |
e1599b0c XL |
204 | let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope }; |
205 | fragment.visit_with(&mut visitor); | |
ba9703b0 | 206 | visitor.parent_scope.macro_rules |
e1599b0c XL |
207 | } |
208 | ||
923072b8 | 209 | pub(crate) fn build_reduced_graph_external(&mut self, module: Module<'a>) { |
9ffffee4 FG |
210 | let children = |
211 | Vec::from_iter(self.cstore().module_children_untracked(module.def_id(), self.tcx.sess)); | |
212 | for child in children { | |
29967ef6 XL |
213 | let parent_scope = ParentScope::module(module, self); |
214 | BuildReducedGraphVisitor { r: self, parent_scope } | |
e1599b0c | 215 | .build_reduced_graph_for_external_crate_res(child); |
416331ca | 216 | } |
416331ca XL |
217 | } |
218 | } | |
219 | ||
9ffffee4 FG |
220 | struct BuildReducedGraphVisitor<'a, 'b, 'tcx> { |
221 | r: &'b mut Resolver<'a, 'tcx>, | |
e1599b0c XL |
222 | parent_scope: ParentScope<'a>, |
223 | } | |
224 | ||
9ffffee4 FG |
225 | impl<'a, 'tcx> AsMut<Resolver<'a, 'tcx>> for BuildReducedGraphVisitor<'a, '_, 'tcx> { |
226 | fn as_mut(&mut self) -> &mut Resolver<'a, 'tcx> { | |
dfeec247 XL |
227 | self.r |
228 | } | |
416331ca XL |
229 | } |
230 | ||
9ffffee4 | 231 | impl<'a, 'b, 'tcx> BuildReducedGraphVisitor<'a, 'b, 'tcx> { |
416331ca | 232 | fn resolve_visibility(&mut self, vis: &ast::Visibility) -> ty::Visibility { |
5e7ed085 | 233 | self.try_resolve_visibility(vis, true).unwrap_or_else(|err| { |
e74abb32 XL |
234 | self.r.report_vis_error(err); |
235 | ty::Visibility::Public | |
236 | }) | |
237 | } | |
238 | ||
5e7ed085 | 239 | fn try_resolve_visibility<'ast>( |
e74abb32 XL |
240 | &mut self, |
241 | vis: &'ast ast::Visibility, | |
5e7ed085 | 242 | finalize: bool, |
e74abb32 | 243 | ) -> Result<ty::Visibility, VisResolutionError<'ast>> { |
416331ca | 244 | let parent_scope = &self.parent_scope; |
1b1a35ee | 245 | match vis.kind { |
e74abb32 | 246 | ast::VisibilityKind::Public => Ok(ty::Visibility::Public), |
416331ca | 247 | ast::VisibilityKind::Inherited => { |
6a06907d XL |
248 | Ok(match self.parent_scope.module.kind { |
249 | // Any inherited visibility resolved directly inside an enum or trait | |
250 | // (i.e. variants, fields, and trait items) inherits from the visibility | |
251 | // of the enum or trait. | |
252 | ModuleKind::Def(DefKind::Enum | DefKind::Trait, def_id, _) => { | |
253 | self.r.visibilities[&def_id.expect_local()] | |
254 | } | |
255 | // Otherwise, the visibility is restricted to the nearest parent `mod` item. | |
f2b60f7d FG |
256 | _ => ty::Visibility::Restricted( |
257 | self.parent_scope.module.nearest_parent_mod().expect_local(), | |
258 | ), | |
6a06907d | 259 | }) |
416331ca XL |
260 | } |
261 | ast::VisibilityKind::Restricted { ref path, id, .. } => { | |
04454e1e FG |
262 | // Make `PRIVATE_IN_PUBLIC` lint a hard error. |
263 | self.r.has_pub_restricted = true; | |
416331ca XL |
264 | // For visibilities we are not ready to provide correct implementation of "uniform |
265 | // paths" right now, so on 2018 edition we only allow module-relative paths for now. | |
266 | // On 2015 edition visibilities are resolved as crate-relative by default, | |
267 | // so we are prepending a root segment if necessary. | |
268 | let ident = path.segments.get(0).expect("empty path in visibility").ident; | |
269 | let crate_root = if ident.is_path_segment_keyword() { | |
270 | None | |
9ffffee4 | 271 | } else if ident.span.is_rust_2015() { |
416331ca | 272 | Some(Segment::from_ident(Ident::new( |
dfeec247 XL |
273 | kw::PathRoot, |
274 | path.span.shrink_to_lo().with_ctxt(ident.span.ctxt()), | |
416331ca | 275 | ))) |
e74abb32 XL |
276 | } else { |
277 | return Err(VisResolutionError::Relative2018(ident.span, path)); | |
416331ca XL |
278 | }; |
279 | ||
dfeec247 XL |
280 | let segments = crate_root |
281 | .into_iter() | |
282 | .chain(path.segments.iter().map(|seg| seg.into())) | |
283 | .collect::<Vec<_>>(); | |
284 | let expected_found_error = |res| { | |
285 | Err(VisResolutionError::ExpectedFound( | |
286 | path.span, | |
287 | Segment::names_to_string(&segments), | |
288 | res, | |
289 | )) | |
290 | }; | |
416331ca XL |
291 | match self.r.resolve_path( |
292 | &segments, | |
293 | Some(TypeNS), | |
294 | parent_scope, | |
04454e1e FG |
295 | finalize.then(|| Finalize::new(id, path.span)), |
296 | None, | |
416331ca XL |
297 | ) { |
298 | PathResult::Module(ModuleOrUniformRoot::Module(module)) => { | |
299 | let res = module.res().expect("visibility resolved to unnamed block"); | |
5e7ed085 | 300 | if finalize { |
e74abb32 XL |
301 | self.r.record_partial_res(id, PartialRes::new(res)); |
302 | } | |
416331ca | 303 | if module.is_normal() { |
9ffffee4 FG |
304 | match res { |
305 | Res::Err => Ok(ty::Visibility::Public), | |
306 | _ => { | |
307 | let vis = ty::Visibility::Restricted(res.def_id()); | |
308 | if self.r.is_accessible_from(vis, parent_scope.module) { | |
309 | Ok(vis.expect_local()) | |
310 | } else { | |
311 | Err(VisResolutionError::AncestorOnly(path.span)) | |
312 | } | |
416331ca XL |
313 | } |
314 | } | |
315 | } else { | |
e74abb32 | 316 | expected_found_error(res) |
416331ca XL |
317 | } |
318 | } | |
dfeec247 XL |
319 | PathResult::Module(..) => Err(VisResolutionError::ModuleOnly(path.span)), |
320 | PathResult::NonModule(partial_res) => { | |
2b03887a | 321 | expected_found_error(partial_res.expect_full_res()) |
dfeec247 XL |
322 | } |
323 | PathResult::Failed { span, label, suggestion, .. } => { | |
324 | Err(VisResolutionError::FailedToResolve(span, label, suggestion)) | |
325 | } | |
326 | PathResult::Indeterminate => Err(VisResolutionError::Indeterminate(path.span)), | |
416331ca XL |
327 | } |
328 | } | |
329 | } | |
330 | } | |
331 | ||
e74abb32 | 332 | fn insert_field_names_local(&mut self, def_id: DefId, vdata: &ast::VariantData) { |
dfeec247 XL |
333 | let field_names = vdata |
334 | .fields() | |
335 | .iter() | |
5869c6ff | 336 | .map(|field| respan(field.span, field.ident.map_or(kw::Empty, |ident| ident.name))) |
dfeec247 | 337 | .collect(); |
487cf647 | 338 | self.r.field_names.insert(def_id, field_names); |
e74abb32 XL |
339 | } |
340 | ||
9c376795 FG |
341 | fn insert_field_visibilities_local(&mut self, def_id: DefId, vdata: &ast::VariantData) { |
342 | let field_vis = vdata | |
343 | .fields() | |
344 | .iter() | |
345 | .map(|field| field.vis.span.until(field.ident.map_or(field.ty.span, |i| i.span))) | |
346 | .collect(); | |
347 | self.r.field_visibility_spans.insert(def_id, field_vis); | |
348 | } | |
349 | ||
487cf647 FG |
350 | fn insert_field_names_extern(&mut self, def_id: DefId) { |
351 | let field_names = | |
9ffffee4 | 352 | self.r.cstore().struct_field_names_untracked(def_id, self.r.tcx.sess).collect(); |
3dfed10e | 353 | self.r.field_names.insert(def_id, field_names); |
416331ca XL |
354 | } |
355 | ||
1a4d82fc | 356 | fn block_needs_anonymous_module(&mut self, block: &Block) -> bool { |
7453a54e | 357 | // If any statements are items, we need to create an anonymous module |
29967ef6 XL |
358 | block |
359 | .stmts | |
360 | .iter() | |
361 | .any(|statement| matches!(statement.kind, StmtKind::Item(_) | StmtKind::MacCall(_))) | |
a7813a04 XL |
362 | } |
363 | ||
74b04a01 XL |
364 | // Add an import to the current module. |
365 | fn add_import( | |
416331ca XL |
366 | &mut self, |
367 | module_path: Vec<Segment>, | |
74b04a01 | 368 | kind: ImportKind<'a>, |
416331ca | 369 | span: Span, |
416331ca XL |
370 | item: &ast::Item, |
371 | root_span: Span, | |
372 | root_id: NodeId, | |
373 | vis: ty::Visibility, | |
374 | ) { | |
e1599b0c | 375 | let current_module = self.parent_scope.module; |
74b04a01 XL |
376 | let import = self.r.arenas.alloc_import(Import { |
377 | kind, | |
e1599b0c | 378 | parent_scope: self.parent_scope, |
416331ca XL |
379 | module_path, |
380 | imported_module: Cell::new(None), | |
416331ca | 381 | span, |
416331ca XL |
382 | use_span: item.span, |
383 | use_span_with_attributes: item.span_with_attributes(), | |
384 | has_attributes: !item.attrs.is_empty(), | |
385 | root_span, | |
386 | root_id, | |
f2b60f7d | 387 | vis: Cell::new(Some(vis)), |
416331ca XL |
388 | used: Cell::new(false), |
389 | }); | |
390 | ||
74b04a01 XL |
391 | self.r.indeterminate_imports.push(import); |
392 | match import.kind { | |
e74abb32 | 393 | // Don't add unresolved underscore imports to modules |
74b04a01 XL |
394 | ImportKind::Single { target: Ident { name: kw::Underscore, .. }, .. } => {} |
395 | ImportKind::Single { target, type_ns_only, .. } => { | |
dfeec247 XL |
396 | self.r.per_ns(|this, ns| { |
397 | if !type_ns_only || ns == TypeNS { | |
398 | let key = this.new_key(target, ns); | |
399 | let mut resolution = this.resolution(current_module, key).borrow_mut(); | |
74b04a01 | 400 | resolution.add_single_import(import); |
dfeec247 | 401 | } |
416331ca XL |
402 | }); |
403 | } | |
404 | // We don't add prelude imports to the globs since they only affect lexical scopes, | |
405 | // which are not relevant to import resolution. | |
74b04a01 XL |
406 | ImportKind::Glob { is_prelude: true, .. } => {} |
407 | ImportKind::Glob { .. } => current_module.globs.borrow_mut().push(import), | |
416331ca | 408 | _ => unreachable!(), |
c30ab7b3 SL |
409 | } |
410 | } | |
9e0c209e | 411 | |
b7449926 XL |
412 | fn build_reduced_graph_for_use_tree( |
413 | &mut self, | |
0bf4aa26 | 414 | // This particular use tree |
b7449926 XL |
415 | use_tree: &ast::UseTree, |
416 | id: NodeId, | |
13cf67c4 | 417 | parent_prefix: &[Segment], |
b7449926 | 418 | nested: bool, |
0bf4aa26 | 419 | // The whole `use` item |
b7449926 | 420 | item: &Item, |
0bf4aa26 XL |
421 | vis: ty::Visibility, |
422 | root_span: Span, | |
b7449926 | 423 | ) { |
dfeec247 XL |
424 | debug!( |
425 | "build_reduced_graph_for_use_tree(parent_prefix={:?}, use_tree={:?}, nested={})", | |
426 | parent_prefix, use_tree, nested | |
427 | ); | |
13cf67c4 | 428 | |
dfeec247 XL |
429 | let mut prefix_iter = parent_prefix |
430 | .iter() | |
431 | .cloned() | |
432 | .chain(use_tree.prefix.segments.iter().map(|seg| seg.into())) | |
433 | .peekable(); | |
13cf67c4 XL |
434 | |
435 | // On 2015 edition imports are resolved as crate-relative by default, | |
436 | // so prefixes are prepended with crate root segment if necessary. | |
437 | // The root is prepended lazily, when the first non-empty prefix or terminating glob | |
438 | // appears, so imports in braced groups can have roots prepended independently. | |
1b1a35ee | 439 | let is_glob = matches!(use_tree.kind, ast::UseTreeKind::Glob); |
13cf67c4 | 440 | let crate_root = match prefix_iter.peek() { |
9ffffee4 | 441 | Some(seg) if !seg.ident.is_path_segment_keyword() && seg.ident.span.is_rust_2015() => { |
13cf67c4 | 442 | Some(seg.ident.span.ctxt()) |
b7449926 | 443 | } |
9ffffee4 | 444 | None if is_glob && use_tree.span.is_rust_2015() => Some(use_tree.span.ctxt()), |
13cf67c4 | 445 | _ => None, |
dfeec247 XL |
446 | } |
447 | .map(|ctxt| { | |
448 | Segment::from_ident(Ident::new( | |
449 | kw::PathRoot, | |
450 | use_tree.prefix.span.shrink_to_lo().with_ctxt(ctxt), | |
451 | )) | |
452 | }); | |
b7449926 | 453 | |
13cf67c4 XL |
454 | let prefix = crate_root.into_iter().chain(prefix_iter).collect::<Vec<_>>(); |
455 | debug!("build_reduced_graph_for_use_tree: prefix={:?}", prefix); | |
ff7c6d11 | 456 | |
13cf67c4 | 457 | let empty_for_self = |prefix: &[Segment]| { |
dfeec247 | 458 | prefix.is_empty() || prefix.len() == 1 && prefix[0].ident.name == kw::PathRoot |
0bf4aa26 | 459 | }; |
ff7c6d11 | 460 | match use_tree.kind { |
487cf647 | 461 | ast::UseTreeKind::Simple(rename) => { |
e74abb32 | 462 | let mut ident = use_tree.ident(); |
b7449926 | 463 | let mut module_path = prefix; |
83c7162d | 464 | let mut source = module_path.pop().unwrap(); |
ff7c6d11 XL |
465 | let mut type_ns_only = false; |
466 | ||
04454e1e | 467 | self.r.visibilities.insert(self.r.local_def_id(id), vis); |
04454e1e | 468 | |
ff7c6d11 XL |
469 | if nested { |
470 | // Correctly handle `self` | |
dc9dc135 | 471 | if source.ident.name == kw::SelfLower { |
ff7c6d11 XL |
472 | type_ns_only = true; |
473 | ||
0bf4aa26 | 474 | if empty_for_self(&module_path) { |
416331ca | 475 | self.r.report_error( |
ff7c6d11 | 476 | use_tree.span, |
dfeec247 | 477 | ResolutionError::SelfImportOnlyInImportListWithNonEmptyPrefix, |
ff7c6d11 XL |
478 | ); |
479 | return; | |
480 | } | |
1a4d82fc | 481 | |
f9f354fc | 482 | // Replace `use foo::{ self };` with `use foo;` |
487cf647 | 483 | let self_span = source.ident.span; |
b7449926 | 484 | source = module_path.pop().unwrap(); |
0531ce1d | 485 | if rename.is_none() { |
487cf647 FG |
486 | // Keep the span of `self`, but the name of `foo` |
487 | ident = Ident { name: source.ident.name, span: self_span }; | |
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 $crate;` |
dc9dc135 | 523 | if source.ident.name == kw::DollarCrate && module_path.is_empty() { |
416331ca | 524 | let crate_root = self.r.resolve_crate_root(source.ident); |
ff7c6d11 | 525 | let crate_name = match crate_root.kind { |
48663c56 | 526 | ModuleKind::Def(.., name) => name, |
064997fb | 527 | ModuleKind::Block => unreachable!(), |
ff7c6d11 | 528 | }; |
b7449926 | 529 | // HACK(eddyb) unclear how good this is, but keeping `$crate` |
9c376795 | 530 | // in `source` breaks `tests/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 | 544 | self.r |
9ffffee4 FG |
545 | .tcx |
546 | .sess | |
dfeec247 | 547 | .struct_span_err(item.span, "`$crate` may not be imported") |
ff7c6d11 | 548 | .emit(); |
85aaf69f | 549 | } |
ff7c6d11 | 550 | } |
85aaf69f | 551 | |
dc9dc135 | 552 | if ident.name == kw::Crate { |
9ffffee4 | 553 | self.r.tcx.sess.span_err( |
dfeec247 | 554 | ident.span, |
b7449926 | 555 | "crate root imports need to be explicitly named: \ |
dfeec247 XL |
556 | `use crate as name;`", |
557 | ); | |
b7449926 XL |
558 | } |
559 | ||
74b04a01 | 560 | let kind = ImportKind::Single { |
13cf67c4 | 561 | source: source.ident, |
69743fb6 XL |
562 | target: ident, |
563 | source_bindings: PerNS { | |
416331ca XL |
564 | type_ns: Cell::new(Err(Determinacy::Undetermined)), |
565 | value_ns: Cell::new(Err(Determinacy::Undetermined)), | |
566 | macro_ns: Cell::new(Err(Determinacy::Undetermined)), | |
83c7162d | 567 | }, |
69743fb6 XL |
568 | target_bindings: PerNS { |
569 | type_ns: Cell::new(None), | |
570 | value_ns: Cell::new(None), | |
571 | macro_ns: Cell::new(None), | |
572 | }, | |
ff7c6d11 | 573 | type_ns_only, |
9fa01778 | 574 | nested, |
487cf647 | 575 | id, |
ff7c6d11 | 576 | }; |
5099ac24 | 577 | |
487cf647 | 578 | self.add_import(module_path, kind, use_tree.span, item, root_span, item.id, vis); |
ff7c6d11 XL |
579 | } |
580 | ast::UseTreeKind::Glob => { | |
74b04a01 | 581 | let kind = ImportKind::Glob { |
9ffffee4 | 582 | is_prelude: self.r.tcx.sess.contains_name(&item.attrs, sym::prelude_import), |
f2b60f7d | 583 | max_vis: Cell::new(None), |
487cf647 | 584 | id, |
ff7c6d11 | 585 | }; |
04454e1e | 586 | self.r.visibilities.insert(self.r.local_def_id(id), vis); |
487cf647 | 587 | self.add_import(prefix, kind, use_tree.span, item, root_span, item.id, vis); |
ff7c6d11 XL |
588 | } |
589 | ast::UseTreeKind::Nested(ref items) => { | |
ff7c6d11 | 590 | // Ensure there is at most one `self` in the list |
dfeec247 XL |
591 | let self_spans = items |
592 | .iter() | |
9c376795 | 593 | .filter_map(|(use_tree, _)| { |
dfeec247 XL |
594 | if let ast::UseTreeKind::Simple(..) = use_tree.kind { |
595 | if use_tree.ident().name == kw::SelfLower { | |
596 | return Some(use_tree.span); | |
597 | } | |
85aaf69f | 598 | } |
ff7c6d11 | 599 | |
dfeec247 XL |
600 | None |
601 | }) | |
602 | .collect::<Vec<_>>(); | |
ff7c6d11 | 603 | if self_spans.len() > 1 { |
416331ca | 604 | let mut e = self.r.into_struct_error( |
ff7c6d11 | 605 | self_spans[0], |
dfeec247 XL |
606 | ResolutionError::SelfImportCanOnlyAppearOnceInTheList, |
607 | ); | |
ff7c6d11 XL |
608 | |
609 | for other_span in self_spans.iter().skip(1) { | |
610 | e.span_label(*other_span, "another `self` import appears here"); | |
85aaf69f | 611 | } |
ff7c6d11 XL |
612 | |
613 | e.emit(); | |
85aaf69f | 614 | } |
ff7c6d11 XL |
615 | |
616 | for &(ref tree, id) in items { | |
617 | self.build_reduced_graph_for_use_tree( | |
0bf4aa26 | 618 | // This particular use tree |
dfeec247 | 619 | tree, id, &prefix, true, // The whole `use` item |
416331ca | 620 | item, vis, root_span, |
0bf4aa26 XL |
621 | ); |
622 | } | |
623 | ||
624 | // Empty groups `a::b::{}` are turned into synthetic `self` imports | |
dc9dc135 | 625 | // `a::b::c::{self as _}`, so that their prefixes are correctly |
0bf4aa26 XL |
626 | // resolved and checked for privacy/stability/etc. |
627 | if items.is_empty() && !empty_for_self(&prefix) { | |
13cf67c4 | 628 | let new_span = prefix[prefix.len() - 1].ident.span; |
0bf4aa26 | 629 | let tree = ast::UseTree { |
dfeec247 | 630 | prefix: ast::Path::from_ident(Ident::new(kw::SelfLower, new_span)), |
487cf647 | 631 | kind: ast::UseTreeKind::Simple(Some(Ident::new(kw::Underscore, new_span))), |
0bf4aa26 XL |
632 | span: use_tree.span, |
633 | }; | |
634 | self.build_reduced_graph_for_use_tree( | |
635 | // This particular use tree | |
dfeec247 XL |
636 | &tree, |
637 | id, | |
638 | &prefix, | |
639 | true, | |
0bf4aa26 | 640 | // The whole `use` item |
dfeec247 | 641 | item, |
f2b60f7d FG |
642 | ty::Visibility::Restricted( |
643 | self.parent_scope.module.nearest_parent_mod().expect_local(), | |
644 | ), | |
dfeec247 | 645 | root_span, |
ff7c6d11 XL |
646 | ); |
647 | } | |
648 | } | |
649 | } | |
650 | } | |
651 | ||
652 | /// Constructs the reduced graph for one item. | |
e1599b0c | 653 | fn build_reduced_graph_for_item(&mut self, item: &'b Item) { |
416331ca | 654 | let parent_scope = &self.parent_scope; |
0bf4aa26 XL |
655 | let parent = parent_scope.module; |
656 | let expansion = parent_scope.expansion; | |
e74abb32 | 657 | let ident = item.ident; |
ff7c6d11 XL |
658 | let sp = item.span; |
659 | let vis = self.resolve_visibility(&item.vis); | |
29967ef6 XL |
660 | let local_def_id = self.r.local_def_id(item.id); |
661 | let def_id = local_def_id.to_def_id(); | |
662 | ||
663 | self.r.visibilities.insert(local_def_id, vis); | |
ff7c6d11 | 664 | |
e74abb32 | 665 | match item.kind { |
ff7c6d11 | 666 | ItemKind::Use(ref use_tree) => { |
ff7c6d11 | 667 | self.build_reduced_graph_for_use_tree( |
0bf4aa26 | 668 | // This particular use tree |
dfeec247 XL |
669 | use_tree, |
670 | item.id, | |
671 | &[], | |
672 | false, | |
0bf4aa26 | 673 | // The whole `use` item |
dfeec247 XL |
674 | item, |
675 | vis, | |
676 | use_tree.span, | |
ff7c6d11 | 677 | ); |
85aaf69f SL |
678 | } |
679 | ||
0531ce1d | 680 | ItemKind::ExternCrate(orig_name) => { |
a2a8927a XL |
681 | self.build_reduced_graph_for_extern_crate( |
682 | orig_name, | |
683 | item, | |
684 | local_def_id, | |
685 | vis, | |
686 | parent, | |
687 | ); | |
85aaf69f SL |
688 | } |
689 | ||
a7813a04 | 690 | ItemKind::Mod(..) => { |
c295e0f8 XL |
691 | let module = self.r.new_module( |
692 | Some(parent), | |
693 | ModuleKind::Def(DefKind::Mod, def_id, ident.name), | |
694 | expansion.to_expn_id(), | |
695 | item.span, | |
696 | parent.no_implicit_prelude | |
9ffffee4 | 697 | || self.r.tcx.sess.contains_name(&item.attrs, sym::no_implicit_prelude), |
c295e0f8 | 698 | ); |
416331ca | 699 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
9e0c209e SL |
700 | |
701 | // Descend into the module. | |
416331ca | 702 | self.parent_scope.module = module; |
1a4d82fc JJ |
703 | } |
704 | ||
1a4d82fc | 705 | // These items live in the value namespace. |
5e7ed085 FG |
706 | ItemKind::Static(_, mt, _) => { |
707 | let res = Res::Def(DefKind::Static(mt), def_id); | |
416331ca | 708 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
1a4d82fc | 709 | } |
9e0c209e | 710 | ItemKind::Const(..) => { |
29967ef6 | 711 | let res = Res::Def(DefKind::Const, def_id); |
416331ca | 712 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
1a4d82fc | 713 | } |
9e0c209e | 714 | ItemKind::Fn(..) => { |
29967ef6 | 715 | let res = Res::Def(DefKind::Fn, def_id); |
416331ca | 716 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
8faf50e0 XL |
717 | |
718 | // Functions introducing procedural macros reserve a slot | |
719 | // in the macro namespace as well (see #52225). | |
416331ca | 720 | self.define_macro(item); |
1a4d82fc JJ |
721 | } |
722 | ||
723 | // These items live in the type namespace. | |
f035d41b | 724 | ItemKind::TyAlias(..) => { |
29967ef6 | 725 | let res = Res::Def(DefKind::TyAlias, def_id); |
416331ca | 726 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
8faf50e0 XL |
727 | } |
728 | ||
e1599b0c | 729 | ItemKind::Enum(_, _) => { |
dfeec247 | 730 | let module = self.r.new_module( |
c295e0f8 XL |
731 | Some(parent), |
732 | ModuleKind::Def(DefKind::Enum, def_id, ident.name), | |
136023e0 | 733 | expansion.to_expn_id(), |
dfeec247 | 734 | item.span, |
c295e0f8 | 735 | parent.no_implicit_prelude, |
dfeec247 | 736 | ); |
416331ca | 737 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
e1599b0c | 738 | self.parent_scope.module = module; |
1a4d82fc JJ |
739 | } |
740 | ||
ff7c6d11 | 741 | ItemKind::TraitAlias(..) => { |
29967ef6 | 742 | let res = Res::Def(DefKind::TraitAlias, def_id); |
416331ca | 743 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
ff7c6d11 XL |
744 | } |
745 | ||
1a4d82fc | 746 | // These items live in both the type and value namespaces. |
e74abb32 | 747 | ItemKind::Struct(ref vdata, _) => { |
1a4d82fc | 748 | // Define a name in the type namespace. |
48663c56 | 749 | let res = Res::Def(DefKind::Struct, def_id); |
416331ca | 750 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
1a4d82fc | 751 | |
abe05a73 | 752 | // Record field names for error reporting. |
e74abb32 | 753 | self.insert_field_names_local(def_id, vdata); |
9c376795 | 754 | self.insert_field_visibilities_local(def_id, vdata); |
8bb4bdeb XL |
755 | |
756 | // If this is a tuple or unit struct, define a name | |
757 | // in the value namespace as well. | |
487cf647 | 758 | if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(vdata) { |
e74abb32 XL |
759 | // If the structure is marked as non_exhaustive then lower the visibility |
760 | // to within the crate. | |
f2b60f7d | 761 | let mut ctor_vis = if vis.is_public() |
9ffffee4 | 762 | && self.r.tcx.sess.contains_name(&item.attrs, sym::non_exhaustive) |
dfeec247 | 763 | { |
f2b60f7d | 764 | ty::Visibility::Restricted(CRATE_DEF_ID) |
ba9703b0 XL |
765 | } else { |
766 | vis | |
767 | }; | |
768 | ||
1b1a35ee XL |
769 | let mut ret_fields = Vec::with_capacity(vdata.fields().len()); |
770 | ||
e74abb32 XL |
771 | for field in vdata.fields() { |
772 | // NOTE: The field may be an expansion placeholder, but expansion sets | |
773 | // correct visibilities for unnamed field placeholders specifically, so the | |
774 | // constructor visibility should still be determined correctly. | |
1b1a35ee | 775 | let field_vis = self |
5e7ed085 | 776 | .try_resolve_visibility(&field.vis, false) |
1b1a35ee XL |
777 | .unwrap_or(ty::Visibility::Public); |
778 | if ctor_vis.is_at_least(field_vis, &*self.r) { | |
779 | ctor_vis = field_vis; | |
e74abb32 | 780 | } |
f2b60f7d | 781 | ret_fields.push(field_vis.to_def_id()); |
e74abb32 | 782 | } |
29967ef6 | 783 | let ctor_def_id = self.r.local_def_id(ctor_node_id); |
487cf647 FG |
784 | let ctor_res = |
785 | Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id.to_def_id()); | |
416331ca | 786 | self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, sp, expansion)); |
29967ef6 | 787 | self.r.visibilities.insert(ctor_def_id, ctor_vis); |
9c376795 FG |
788 | // We need the field visibility spans also for the constructor for E0603. |
789 | self.insert_field_visibilities_local(ctor_def_id.to_def_id(), vdata); | |
29967ef6 | 790 | |
f2b60f7d FG |
791 | self.r |
792 | .struct_constructors | |
793 | .insert(def_id, (ctor_res, ctor_vis.to_def_id(), ret_fields)); | |
8bb4bdeb | 794 | } |
1a4d82fc JJ |
795 | } |
796 | ||
9e0c209e | 797 | ItemKind::Union(ref vdata, _) => { |
e74abb32 | 798 | let res = Res::Def(DefKind::Union, def_id); |
416331ca | 799 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
1a4d82fc | 800 | |
c30ab7b3 | 801 | // Record field names for error reporting. |
e74abb32 | 802 | self.insert_field_names_local(def_id, vdata); |
9c376795 | 803 | self.insert_field_visibilities_local(def_id, vdata); |
416331ca | 804 | } |
1a4d82fc | 805 | |
9e0c209e | 806 | ItemKind::Trait(..) => { |
9e0c209e | 807 | // Add all the items within to a new module. |
dfeec247 | 808 | let module = self.r.new_module( |
c295e0f8 XL |
809 | Some(parent), |
810 | ModuleKind::Def(DefKind::Trait, def_id, ident.name), | |
136023e0 | 811 | expansion.to_expn_id(), |
dfeec247 | 812 | item.span, |
c295e0f8 | 813 | parent.no_implicit_prelude, |
dfeec247 | 814 | ); |
416331ca XL |
815 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
816 | self.parent_scope.module = module; | |
1a4d82fc | 817 | } |
ff7c6d11 | 818 | |
e74abb32 | 819 | // These items do not add names to modules. |
3c0e092e | 820 | ItemKind::Impl(box Impl { of_trait: Some(..), .. }) => { |
29967ef6 XL |
821 | self.r.trait_impl_items.insert(local_def_id); |
822 | } | |
dfeec247 | 823 | ItemKind::Impl { .. } | ItemKind::ForeignMod(..) | ItemKind::GlobalAsm(..) => {} |
e74abb32 | 824 | |
ba9703b0 | 825 | ItemKind::MacroDef(..) | ItemKind::MacCall(_) => unreachable!(), |
1a4d82fc JJ |
826 | } |
827 | } | |
828 | ||
a2a8927a XL |
829 | fn build_reduced_graph_for_extern_crate( |
830 | &mut self, | |
831 | orig_name: Option<Symbol>, | |
832 | item: &Item, | |
833 | local_def_id: LocalDefId, | |
834 | vis: ty::Visibility, | |
835 | parent: Module<'a>, | |
836 | ) { | |
837 | let ident = item.ident; | |
838 | let sp = item.span; | |
839 | let parent_scope = self.parent_scope; | |
840 | let expansion = parent_scope.expansion; | |
841 | ||
842 | let (used, module, binding) = if orig_name.is_none() && ident.name == kw::SelfLower { | |
843 | self.r | |
9ffffee4 FG |
844 | .tcx |
845 | .sess | |
a2a8927a XL |
846 | .struct_span_err(item.span, "`extern crate self;` requires renaming") |
847 | .span_suggestion( | |
848 | item.span, | |
849 | "rename the `self` crate to be able to import it", | |
04454e1e | 850 | "extern crate self as name;", |
a2a8927a XL |
851 | Applicability::HasPlaceholders, |
852 | ) | |
853 | .emit(); | |
854 | return; | |
855 | } else if orig_name == Some(kw::SelfLower) { | |
856 | Some(self.r.graph_root) | |
857 | } else { | |
9ffffee4 FG |
858 | let tcx = self.r.tcx; |
859 | let crate_id = self.r.crate_loader(|c| { | |
860 | c.process_extern_crate(item, local_def_id, &tcx.definitions_untracked()) | |
861 | }); | |
9c376795 FG |
862 | crate_id.map(|crate_id| { |
863 | self.r.extern_crate_map.insert(local_def_id, crate_id); | |
864 | self.r.expect_module(crate_id.as_def_id()) | |
865 | }) | |
a2a8927a XL |
866 | } |
867 | .map(|module| { | |
868 | let used = self.process_macro_use_imports(item, module); | |
f2b60f7d FG |
869 | let vis = ty::Visibility::<LocalDefId>::Public; |
870 | let binding = (module, vis, sp, expansion).to_name_binding(self.r.arenas); | |
a2a8927a XL |
871 | (used, Some(ModuleOrUniformRoot::Module(module)), binding) |
872 | }) | |
873 | .unwrap_or((true, None, self.r.dummy_binding)); | |
874 | let import = self.r.arenas.alloc_import(Import { | |
487cf647 | 875 | kind: ImportKind::ExternCrate { source: orig_name, target: ident, id: item.id }, |
a2a8927a | 876 | root_id: item.id, |
a2a8927a XL |
877 | parent_scope: self.parent_scope, |
878 | imported_module: Cell::new(module), | |
879 | has_attributes: !item.attrs.is_empty(), | |
880 | use_span_with_attributes: item.span_with_attributes(), | |
881 | use_span: item.span, | |
882 | root_span: item.span, | |
883 | span: item.span, | |
884 | module_path: Vec::new(), | |
f2b60f7d | 885 | vis: Cell::new(Some(vis)), |
a2a8927a XL |
886 | used: Cell::new(used), |
887 | }); | |
888 | self.r.potentially_unused_imports.push(import); | |
889 | let imported_binding = self.r.import(binding, import); | |
890 | if ptr::eq(parent, self.r.graph_root) { | |
891 | if let Some(entry) = self.r.extern_prelude.get(&ident.normalize_to_macros_2_0()) { | |
892 | if expansion != LocalExpnId::ROOT | |
893 | && orig_name.is_some() | |
894 | && entry.extern_crate_item.is_none() | |
895 | { | |
896 | let msg = "macro-expanded `extern crate` items cannot \ | |
897 | shadow names passed with `--extern`"; | |
9ffffee4 | 898 | self.r.tcx.sess.span_err(item.span, msg); |
a2a8927a XL |
899 | } |
900 | } | |
901 | let entry = self.r.extern_prelude.entry(ident.normalize_to_macros_2_0()).or_insert( | |
902 | ExternPreludeEntry { extern_crate_item: None, introduced_by_item: true }, | |
903 | ); | |
904 | entry.extern_crate_item = Some(imported_binding); | |
905 | if orig_name.is_some() { | |
906 | entry.introduced_by_item = true; | |
907 | } | |
908 | } | |
909 | self.r.define(parent, ident, TypeNS, imported_binding); | |
910 | } | |
911 | ||
1a4d82fc | 912 | /// Constructs the reduced graph for one foreign item. |
416331ca | 913 | fn build_reduced_graph_for_foreign_item(&mut self, item: &ForeignItem) { |
29967ef6 XL |
914 | let local_def_id = self.r.local_def_id(item.id); |
915 | let def_id = local_def_id.to_def_id(); | |
916 | let (def_kind, ns) = match item.kind { | |
917 | ForeignItemKind::Fn(..) => (DefKind::Fn, ValueNS), | |
5e7ed085 | 918 | ForeignItemKind::Static(_, mt, _) => (DefKind::Static(mt), ValueNS), |
29967ef6 | 919 | ForeignItemKind::TyAlias(..) => (DefKind::ForeignTy, TypeNS), |
ba9703b0 | 920 | ForeignItemKind::MacCall(_) => unreachable!(), |
c34b1796 | 921 | }; |
416331ca XL |
922 | let parent = self.parent_scope.module; |
923 | let expansion = self.parent_scope.expansion; | |
476ff2be | 924 | let vis = self.resolve_visibility(&item.vis); |
29967ef6 | 925 | let res = Res::Def(def_kind, def_id); |
416331ca | 926 | self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion)); |
29967ef6 | 927 | self.r.visibilities.insert(local_def_id, vis); |
1a4d82fc JJ |
928 | } |
929 | ||
416331ca XL |
930 | fn build_reduced_graph_for_block(&mut self, block: &Block) { |
931 | let parent = self.parent_scope.module; | |
932 | let expansion = self.parent_scope.expansion; | |
1a4d82fc | 933 | if self.block_needs_anonymous_module(block) { |
dfeec247 | 934 | let module = self.r.new_module( |
c295e0f8 | 935 | Some(parent), |
064997fb | 936 | ModuleKind::Block, |
136023e0 | 937 | expansion.to_expn_id(), |
dfeec247 | 938 | block.span, |
c295e0f8 | 939 | parent.no_implicit_prelude, |
dfeec247 | 940 | ); |
416331ca XL |
941 | self.r.block_map.insert(block.id, module); |
942 | self.parent_scope.module = module; // Descend into the block. | |
1a4d82fc JJ |
943 | } |
944 | } | |
945 | ||
54a0048b | 946 | /// Builds the reduced graph for a single item in an external crate. |
5099ac24 | 947 | fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) { |
e1599b0c | 948 | let parent = self.parent_scope.module; |
5e7ed085 | 949 | let ModChild { ident, res, vis, span, macro_rules } = child; |
c295e0f8 | 950 | let res = res.expect_non_local(); |
3dfed10e | 951 | let expansion = self.parent_scope.expansion; |
e1599b0c | 952 | // Record primary definitions. |
48663c56 | 953 | match res { |
c295e0f8 XL |
954 | Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, def_id) => { |
955 | let module = self.r.expect_module(def_id); | |
e74abb32 | 956 | self.r.define(parent, ident, TypeNS, (module, vis, span, expansion)); |
c30ab7b3 | 957 | } |
ba9703b0 XL |
958 | Res::Def( |
959 | DefKind::Struct | |
960 | | DefKind::Union | |
961 | | DefKind::Variant | |
962 | | DefKind::TyAlias | |
963 | | DefKind::ForeignTy | |
964 | | DefKind::OpaqueTy | |
f2b60f7d | 965 | | DefKind::ImplTraitPlaceholder |
ba9703b0 | 966 | | DefKind::TraitAlias |
f035d41b | 967 | | DefKind::AssocTy, |
ba9703b0 XL |
968 | _, |
969 | ) | |
48663c56 | 970 | | Res::PrimTy(..) |
dfeec247 | 971 | | Res::ToolMod => self.r.define(parent, ident, TypeNS, (res, vis, span, expansion)), |
ba9703b0 XL |
972 | Res::Def( |
973 | DefKind::Fn | |
974 | | DefKind::AssocFn | |
5e7ed085 | 975 | | DefKind::Static(_) |
ba9703b0 XL |
976 | | DefKind::Const |
977 | | DefKind::AssocConst | |
978 | | DefKind::Ctor(..), | |
979 | _, | |
980 | ) => self.r.define(parent, ident, ValueNS, (res, vis, span, expansion)), | |
dfeec247 | 981 | Res::Def(DefKind::Macro(..), _) | Res::NonMacroAttr(..) => { |
5e7ed085 FG |
982 | if !macro_rules { |
983 | self.r.define(parent, ident, MacroNS, (res, vis, span, expansion)) | |
984 | } | |
dfeec247 | 985 | } |
f9f354fc XL |
986 | Res::Def( |
987 | DefKind::TyParam | |
988 | | DefKind::ConstParam | |
989 | | DefKind::ExternCrate | |
990 | | DefKind::Use | |
991 | | DefKind::ForeignMod | |
992 | | DefKind::AnonConst | |
3c0e092e | 993 | | DefKind::InlineConst |
f9f354fc XL |
994 | | DefKind::Field |
995 | | DefKind::LifetimeParam | |
996 | | DefKind::GlobalAsm | |
997 | | DefKind::Closure | |
9ffffee4 | 998 | | DefKind::Impl { .. } |
f9f354fc XL |
999 | | DefKind::Generator, |
1000 | _, | |
1001 | ) | |
dfeec247 | 1002 | | Res::Local(..) |
2b03887a FG |
1003 | | Res::SelfTyParam { .. } |
1004 | | Res::SelfTyAlias { .. } | |
dfeec247 XL |
1005 | | Res::SelfCtor(..) |
1006 | | Res::Err => bug!("unexpected resolution: {:?}", res), | |
e1599b0c XL |
1007 | } |
1008 | // Record some extra data for better diagnostics. | |
1009 | match res { | |
17df50a5 | 1010 | Res::Def(DefKind::Struct, def_id) => { |
9ffffee4 | 1011 | let cstore = self.r.cstore(); |
487cf647 | 1012 | if let Some((ctor_kind, ctor_def_id)) = cstore.ctor_untracked(def_id) { |
17df50a5 XL |
1013 | let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id); |
1014 | let ctor_vis = cstore.visibility_untracked(ctor_def_id); | |
5099ac24 FG |
1015 | let field_visibilities = |
1016 | cstore.struct_field_visibilities_untracked(def_id).collect(); | |
9ffffee4 | 1017 | drop(cstore); |
17df50a5 XL |
1018 | self.r |
1019 | .struct_constructors | |
1020 | .insert(def_id, (ctor_res, ctor_vis, field_visibilities)); | |
9ffffee4 FG |
1021 | } else { |
1022 | drop(cstore); | |
17df50a5 | 1023 | } |
487cf647 | 1024 | self.insert_field_names_extern(def_id) |
9e0c209e | 1025 | } |
487cf647 | 1026 | Res::Def(DefKind::Union, def_id) => self.insert_field_names_extern(def_id), |
ba9703b0 | 1027 | Res::Def(DefKind::AssocFn, def_id) => { |
9ffffee4 | 1028 | if self.r.cstore().fn_has_self_parameter_untracked(def_id, self.r.tcx.sess) { |
e1599b0c XL |
1029 | self.r.has_self.insert(def_id); |
1030 | } | |
1031 | } | |
e1599b0c | 1032 | _ => {} |
1a4d82fc JJ |
1033 | } |
1034 | } | |
1035 | ||
ba9703b0 | 1036 | fn add_macro_use_binding( |
dfeec247 | 1037 | &mut self, |
f9f354fc | 1038 | name: Symbol, |
dfeec247 XL |
1039 | binding: &'a NameBinding<'a>, |
1040 | span: Span, | |
1041 | allow_shadowing: bool, | |
1042 | ) { | |
416331ca | 1043 | if self.r.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing { |
476ff2be SL |
1044 | let msg = format!("`{}` is already in scope", name); |
1045 | let note = | |
1046 | "macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)"; | |
9ffffee4 | 1047 | self.r.tcx.sess.struct_span_err(span, &msg).note(note).emit(); |
476ff2be SL |
1048 | } |
1049 | } | |
c30ab7b3 | 1050 | |
9fa01778 | 1051 | /// Returns `true` if we should consider the underlying `extern crate` to be used. |
ba9703b0 | 1052 | fn process_macro_use_imports(&mut self, item: &Item, module: Module<'a>) -> bool { |
0bf4aa26 XL |
1053 | let mut import_all = None; |
1054 | let mut single_imports = Vec::new(); | |
1055 | for attr in &item.attrs { | |
94222f64 | 1056 | if attr.has_name(sym::macro_use) { |
416331ca | 1057 | if self.parent_scope.module.parent.is_some() { |
dfeec247 | 1058 | struct_span_err!( |
9ffffee4 | 1059 | self.r.tcx.sess, |
dfeec247 XL |
1060 | item.span, |
1061 | E0468, | |
1062 | "an `extern crate` loading macros must be at the crate root" | |
1063 | ) | |
1064 | .emit(); | |
0bf4aa26 | 1065 | } |
e74abb32 | 1066 | if let ItemKind::ExternCrate(Some(orig_name)) = item.kind { |
dc9dc135 | 1067 | if orig_name == kw::SelfLower { |
dfeec247 | 1068 | self.r |
9ffffee4 FG |
1069 | .tcx |
1070 | .sess | |
dfeec247 XL |
1071 | .struct_span_err( |
1072 | attr.span, | |
1073 | "`#[macro_use]` is not supported on `extern crate self`", | |
1074 | ) | |
1075 | .emit(); | |
a1dfa0c6 XL |
1076 | } |
1077 | } | |
5e7ed085 | 1078 | let ill_formed = |span| { |
9ffffee4 | 1079 | struct_span_err!(self.r.tcx.sess, span, E0466, "bad macro import").emit(); |
5e7ed085 | 1080 | }; |
0bf4aa26 | 1081 | match attr.meta() { |
e74abb32 | 1082 | Some(meta) => match meta.kind { |
0bf4aa26 XL |
1083 | MetaItemKind::Word => { |
1084 | import_all = Some(meta.span); | |
1085 | break; | |
1086 | } | |
dfeec247 XL |
1087 | MetaItemKind::List(nested_metas) => { |
1088 | for nested_meta in nested_metas { | |
1089 | match nested_meta.ident() { | |
1090 | Some(ident) if nested_meta.is_word() => { | |
1091 | single_imports.push(ident) | |
1092 | } | |
1093 | _ => ill_formed(nested_meta.span()), | |
1094 | } | |
0bf4aa26 XL |
1095 | } |
1096 | } | |
1097 | MetaItemKind::NameValue(..) => ill_formed(meta.span), | |
dfeec247 | 1098 | }, |
532ac7d7 | 1099 | None => ill_formed(attr.span), |
0bf4aa26 XL |
1100 | } |
1101 | } | |
476ff2be | 1102 | } |
c30ab7b3 | 1103 | |
74b04a01 XL |
1104 | let macro_use_import = |this: &Self, span| { |
1105 | this.r.arenas.alloc_import(Import { | |
1106 | kind: ImportKind::MacroUse, | |
dfeec247 | 1107 | root_id: item.id, |
dfeec247 XL |
1108 | parent_scope: this.parent_scope, |
1109 | imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))), | |
dfeec247 XL |
1110 | use_span_with_attributes: item.span_with_attributes(), |
1111 | has_attributes: !item.attrs.is_empty(), | |
1112 | use_span: item.span, | |
1113 | root_span: span, | |
1114 | span, | |
1115 | module_path: Vec::new(), | |
f2b60f7d | 1116 | vis: Cell::new(Some(ty::Visibility::Restricted(CRATE_DEF_ID))), |
dfeec247 XL |
1117 | used: Cell::new(false), |
1118 | }) | |
1119 | }; | |
32a655c1 | 1120 | |
136023e0 | 1121 | let allow_shadowing = self.parent_scope.expansion == LocalExpnId::ROOT; |
0bf4aa26 | 1122 | if let Some(span) = import_all { |
74b04a01 XL |
1123 | let import = macro_use_import(self, span); |
1124 | self.r.potentially_unused_imports.push(import); | |
dfeec247 XL |
1125 | module.for_each_child(self, |this, ident, ns, binding| { |
1126 | if ns == MacroNS { | |
74b04a01 | 1127 | let imported_binding = this.r.import(binding, import); |
ba9703b0 | 1128 | this.add_macro_use_binding(ident.name, imported_binding, span, allow_shadowing); |
dfeec247 | 1129 | } |
476ff2be SL |
1130 | }); |
1131 | } else { | |
9fa01778 | 1132 | for ident in single_imports.iter().cloned() { |
04454e1e | 1133 | let result = self.r.maybe_resolve_ident_in_module( |
b7449926 XL |
1134 | ModuleOrUniformRoot::Module(module), |
1135 | ident, | |
1136 | MacroNS, | |
416331ca | 1137 | &self.parent_scope, |
b7449926 | 1138 | ); |
476ff2be | 1139 | if let Ok(binding) = result { |
74b04a01 XL |
1140 | let import = macro_use_import(self, ident.span); |
1141 | self.r.potentially_unused_imports.push(import); | |
1142 | let imported_binding = self.r.import(binding, import); | |
ba9703b0 | 1143 | self.add_macro_use_binding( |
dfeec247 XL |
1144 | ident.name, |
1145 | imported_binding, | |
1146 | ident.span, | |
1147 | allow_shadowing, | |
1148 | ); | |
c30ab7b3 | 1149 | } else { |
9ffffee4 FG |
1150 | struct_span_err!( |
1151 | self.r.tcx.sess, | |
1152 | ident.span, | |
1153 | E0469, | |
1154 | "imported macro not found" | |
1155 | ) | |
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]`"; |
9ffffee4 | 1168 | let mut err = self.r.tcx.sess.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() { | |
9ffffee4 FG |
1179 | self.r |
1180 | .tcx | |
1181 | .sess | |
1182 | .span_err(attr.span, "arguments to `macro_use` are not allowed here"); | |
c30ab7b3 SL |
1183 | } |
1184 | return true; | |
1185 | } | |
1186 | ||
1187 | false | |
1188 | } | |
1a4d82fc | 1189 | |
136023e0 | 1190 | fn visit_invoc(&mut self, id: NodeId) -> LocalExpnId { |
416331ca | 1191 | let invoc_id = id.placeholder_to_expn_id(); |
e1599b0c XL |
1192 | let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope); |
1193 | assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation"); | |
fc512014 XL |
1194 | invoc_id |
1195 | } | |
416331ca | 1196 | |
fc512014 XL |
1197 | /// Visit invocation in context in which it can emit a named item (possibly `macro_rules`) |
1198 | /// directly into its parent scope's module. | |
1199 | fn visit_invoc_in_module(&mut self, id: NodeId) -> MacroRulesScopeRef<'a> { | |
1200 | let invoc_id = self.visit_invoc(id); | |
1201 | self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id); | |
1202 | self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Invocation(invoc_id)) | |
416331ca XL |
1203 | } |
1204 | ||
3dfed10e | 1205 | fn proc_macro_stub(&self, item: &ast::Item) -> Option<(MacroKind, Ident, Span)> { |
9ffffee4 | 1206 | if self.r.tcx.sess.contains_name(&item.attrs, sym::proc_macro) { |
416331ca | 1207 | return Some((MacroKind::Bang, item.ident, item.span)); |
9ffffee4 | 1208 | } else if self.r.tcx.sess.contains_name(&item.attrs, sym::proc_macro_attribute) { |
416331ca | 1209 | return Some((MacroKind::Attr, item.ident, item.span)); |
9ffffee4 | 1210 | } else if let Some(attr) = self.r.tcx.sess.find_by_name(&item.attrs, sym::proc_macro_derive) |
3dfed10e | 1211 | { |
416331ca XL |
1212 | if let Some(nested_meta) = attr.meta_item_list().and_then(|list| list.get(0).cloned()) { |
1213 | if let Some(ident) = nested_meta.ident() { | |
1214 | return Some((MacroKind::Derive, ident, ident.span)); | |
1215 | } | |
1216 | } | |
1217 | } | |
1218 | None | |
1219 | } | |
1220 | ||
e74abb32 XL |
1221 | // Mark the given macro as unused unless its name starts with `_`. |
1222 | // Macro uses will remove items from this set, and the remaining | |
1223 | // items will be reported as `unused_macros`. | |
04454e1e FG |
1224 | fn insert_unused_macro( |
1225 | &mut self, | |
1226 | ident: Ident, | |
1227 | def_id: LocalDefId, | |
1228 | node_id: NodeId, | |
923072b8 | 1229 | rule_spans: &[(usize, Span)], |
04454e1e | 1230 | ) { |
74b04a01 | 1231 | if !ident.as_str().starts_with('_') { |
3c0e092e | 1232 | self.r.unused_macros.insert(def_id, (node_id, ident)); |
923072b8 FG |
1233 | for (rule_i, rule_span) in rule_spans.iter() { |
1234 | self.r.unused_macro_rules.insert((def_id, *rule_i), (ident, *rule_span)); | |
04454e1e | 1235 | } |
e74abb32 XL |
1236 | } |
1237 | } | |
1238 | ||
29967ef6 | 1239 | fn define_macro(&mut self, item: &ast::Item) -> MacroRulesScopeRef<'a> { |
e74abb32 | 1240 | let parent_scope = self.parent_scope; |
416331ca | 1241 | let expansion = parent_scope.expansion; |
f035d41b | 1242 | let def_id = self.r.local_def_id(item.id); |
04454e1e | 1243 | let (ext, ident, span, macro_rules, rule_spans) = match &item.kind { |
416331ca | 1244 | ItemKind::MacroDef(def) => { |
9ffffee4 | 1245 | let (ext, rule_spans) = self.r.compile_macro(item, self.r.tcx.sess.edition()); |
04454e1e FG |
1246 | let ext = Lrc::new(ext); |
1247 | (ext, item.ident, item.span, def.macro_rules, rule_spans) | |
416331ca | 1248 | } |
3dfed10e | 1249 | ItemKind::Fn(..) => match self.proc_macro_stub(item) { |
416331ca | 1250 | Some((macro_kind, ident, span)) => { |
f9f354fc | 1251 | self.r.proc_macro_stubs.insert(def_id); |
04454e1e | 1252 | (self.r.dummy_ext(macro_kind), ident, span, false, Vec::new()) |
416331ca | 1253 | } |
ba9703b0 | 1254 | None => return parent_scope.macro_rules, |
dfeec247 | 1255 | }, |
416331ca XL |
1256 | _ => unreachable!(), |
1257 | }; | |
1258 | ||
f9f354fc | 1259 | let res = Res::Def(DefKind::Macro(ext.macro_kind()), def_id.to_def_id()); |
923072b8 | 1260 | self.r.macro_map.insert(def_id.to_def_id(), MacroData { ext, macro_rules }); |
f9f354fc | 1261 | self.r.local_macro_def_scopes.insert(def_id, parent_scope.module); |
416331ca | 1262 | |
cdc7bbd5 | 1263 | if macro_rules { |
ba9703b0 | 1264 | let ident = ident.normalize_to_macros_2_0(); |
416331ca | 1265 | self.r.macro_names.insert(ident); |
9ffffee4 | 1266 | let is_macro_export = self.r.tcx.sess.contains_name(&item.attrs, sym::macro_export); |
416331ca XL |
1267 | let vis = if is_macro_export { |
1268 | ty::Visibility::Public | |
1269 | } else { | |
f2b60f7d | 1270 | ty::Visibility::Restricted(CRATE_DEF_ID) |
416331ca XL |
1271 | }; |
1272 | let binding = (res, vis, span, expansion).to_name_binding(self.r.arenas); | |
1273 | self.r.set_binding_parent_module(binding, parent_scope.module); | |
9ffffee4 | 1274 | self.r.all_macro_rules.insert(ident.name, res); |
416331ca | 1275 | if is_macro_export { |
487cf647 FG |
1276 | let import = self.r.arenas.alloc_import(Import { |
1277 | kind: ImportKind::MacroExport, | |
1278 | root_id: item.id, | |
1279 | parent_scope: self.parent_scope, | |
1280 | imported_module: Cell::new(None), | |
1281 | has_attributes: false, | |
1282 | use_span_with_attributes: span, | |
1283 | use_span: span, | |
1284 | root_span: span, | |
1285 | span: span, | |
1286 | module_path: Vec::new(), | |
1287 | vis: Cell::new(Some(vis)), | |
1288 | used: Cell::new(true), | |
1289 | }); | |
1290 | let import_binding = self.r.import(binding, import); | |
1291 | self.r.define(self.r.graph_root, ident, MacroNS, import_binding); | |
416331ca XL |
1292 | } else { |
1293 | self.r.check_reserved_macro_name(ident, res); | |
04454e1e | 1294 | self.insert_unused_macro(ident, def_id, item.id, &rule_spans); |
416331ca | 1295 | } |
29967ef6 | 1296 | self.r.visibilities.insert(def_id, vis); |
04454e1e | 1297 | let scope = self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Binding( |
29967ef6 XL |
1298 | self.r.arenas.alloc_macro_rules_binding(MacroRulesBinding { |
1299 | parent_macro_rules_scope: parent_scope.macro_rules, | |
1300 | binding, | |
1301 | ident, | |
1302 | }), | |
04454e1e FG |
1303 | )); |
1304 | self.r.macro_rules_scopes.insert(def_id, scope); | |
1305 | scope | |
416331ca XL |
1306 | } else { |
1307 | let module = parent_scope.module; | |
ba9703b0 XL |
1308 | let vis = match item.kind { |
1309 | // Visibilities must not be resolved non-speculatively twice | |
1310 | // and we already resolved this one as a `fn` item visibility. | |
5e7ed085 FG |
1311 | ItemKind::Fn(..) => { |
1312 | self.try_resolve_visibility(&item.vis, false).unwrap_or(ty::Visibility::Public) | |
1313 | } | |
ba9703b0 XL |
1314 | _ => self.resolve_visibility(&item.vis), |
1315 | }; | |
f2b60f7d | 1316 | if !vis.is_public() { |
04454e1e | 1317 | self.insert_unused_macro(ident, def_id, item.id, &rule_spans); |
416331ca XL |
1318 | } |
1319 | self.r.define(module, ident, MacroNS, (res, vis, span, expansion)); | |
29967ef6 | 1320 | self.r.visibilities.insert(def_id, vis); |
ba9703b0 | 1321 | self.parent_scope.macro_rules |
416331ca | 1322 | } |
c30ab7b3 SL |
1323 | } |
1324 | } | |
1325 | ||
1326 | macro_rules! method { | |
1327 | ($visit:ident: $ty:ty, $invoc:path, $walk:ident) => { | |
416331ca | 1328 | fn $visit(&mut self, node: &'b $ty) { |
e74abb32 | 1329 | if let $invoc(..) = node.kind { |
c30ab7b3 SL |
1330 | self.visit_invoc(node.id); |
1331 | } else { | |
1332 | visit::$walk(self, node); | |
1333 | } | |
1334 | } | |
ba9703b0 | 1335 | }; |
1a4d82fc JJ |
1336 | } |
1337 | ||
9ffffee4 | 1338 | impl<'a, 'b, 'tcx> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b, 'tcx> { |
ba9703b0 XL |
1339 | method!(visit_expr: ast::Expr, ast::ExprKind::MacCall, walk_expr); |
1340 | method!(visit_pat: ast::Pat, ast::PatKind::MacCall, walk_pat); | |
1341 | method!(visit_ty: ast::Ty, ast::TyKind::MacCall, walk_ty); | |
c30ab7b3 | 1342 | |
416331ca | 1343 | fn visit_item(&mut self, item: &'b Item) { |
5869c6ff XL |
1344 | let orig_module_scope = self.parent_scope.module; |
1345 | self.parent_scope.macro_rules = match item.kind { | |
8bb4bdeb | 1346 | ItemKind::MacroDef(..) => { |
5869c6ff XL |
1347 | let macro_rules_scope = self.define_macro(item); |
1348 | visit::walk_item(self, item); | |
1349 | macro_rules_scope | |
8bb4bdeb | 1350 | } |
ba9703b0 | 1351 | ItemKind::MacCall(..) => { |
5869c6ff XL |
1352 | let macro_rules_scope = self.visit_invoc_in_module(item.id); |
1353 | visit::walk_item(self, item); | |
1354 | macro_rules_scope | |
1355 | } | |
1356 | _ => { | |
1357 | let orig_macro_rules_scope = self.parent_scope.macro_rules; | |
1358 | self.build_reduced_graph_for_item(item); | |
1359 | visit::walk_item(self, item); | |
1360 | match item.kind { | |
1361 | ItemKind::Mod(..) if self.contains_macro_use(&item.attrs) => { | |
1362 | self.parent_scope.macro_rules | |
1363 | } | |
1364 | _ => orig_macro_rules_scope, | |
1365 | } | |
c30ab7b3 | 1366 | } |
c30ab7b3 | 1367 | }; |
5869c6ff | 1368 | self.parent_scope.module = orig_module_scope; |
c30ab7b3 SL |
1369 | } |
1370 | ||
416331ca | 1371 | fn visit_stmt(&mut self, stmt: &'b ast::Stmt) { |
ba9703b0 | 1372 | if let ast::StmtKind::MacCall(..) = stmt.kind { |
fc512014 | 1373 | self.parent_scope.macro_rules = self.visit_invoc_in_module(stmt.id); |
c30ab7b3 SL |
1374 | } else { |
1375 | visit::walk_stmt(self, stmt); | |
1376 | } | |
1a4d82fc JJ |
1377 | } |
1378 | ||
416331ca | 1379 | fn visit_foreign_item(&mut self, foreign_item: &'b ForeignItem) { |
ba9703b0 | 1380 | if let ForeignItemKind::MacCall(_) = foreign_item.kind { |
fc512014 | 1381 | self.visit_invoc_in_module(foreign_item.id); |
83c7162d XL |
1382 | return; |
1383 | } | |
1384 | ||
416331ca | 1385 | self.build_reduced_graph_for_foreign_item(foreign_item); |
c30ab7b3 | 1386 | visit::walk_foreign_item(self, foreign_item); |
1a4d82fc JJ |
1387 | } |
1388 | ||
416331ca XL |
1389 | fn visit_block(&mut self, block: &'b Block) { |
1390 | let orig_current_module = self.parent_scope.module; | |
ba9703b0 | 1391 | let orig_current_macro_rules_scope = self.parent_scope.macro_rules; |
416331ca | 1392 | self.build_reduced_graph_for_block(block); |
a7813a04 | 1393 | visit::walk_block(self, block); |
416331ca | 1394 | self.parent_scope.module = orig_current_module; |
ba9703b0 | 1395 | self.parent_scope.macro_rules = orig_current_macro_rules_scope; |
9e0c209e SL |
1396 | } |
1397 | ||
74b04a01 | 1398 | fn visit_assoc_item(&mut self, item: &'b AssocItem, ctxt: AssocCtxt) { |
ba9703b0 | 1399 | if let AssocItemKind::MacCall(_) = item.kind { |
fc512014 XL |
1400 | match ctxt { |
1401 | AssocCtxt::Trait => { | |
1402 | self.visit_invoc_in_module(item.id); | |
1403 | } | |
1404 | AssocCtxt::Impl => { | |
1405 | self.visit_invoc(item.id); | |
1406 | } | |
1407 | } | |
dfeec247 | 1408 | return; |
c30ab7b3 SL |
1409 | } |
1410 | ||
6a06907d | 1411 | let vis = self.resolve_visibility(&item.vis); |
29967ef6 XL |
1412 | let local_def_id = self.r.local_def_id(item.id); |
1413 | let def_id = local_def_id.to_def_id(); | |
74b04a01 | 1414 | |
6a06907d XL |
1415 | if !(ctxt == AssocCtxt::Impl |
1416 | && matches!(item.vis.kind, ast::VisibilityKind::Inherited) | |
1417 | && self | |
1418 | .r | |
1419 | .trait_impl_items | |
04454e1e | 1420 | .contains(&ty::DefIdTree::local_parent(&*self.r, local_def_id))) |
6a06907d XL |
1421 | { |
1422 | // Trait impl item visibility is inherited from its trait when not specified | |
1423 | // explicitly. In that case we cannot determine it here in early resolve, | |
1424 | // so we leave a hole in the visibility table to be filled later. | |
1425 | self.r.visibilities.insert(local_def_id, vis); | |
1426 | } | |
1427 | ||
1428 | if ctxt == AssocCtxt::Trait { | |
1429 | let (def_kind, ns) = match item.kind { | |
1430 | AssocItemKind::Const(..) => (DefKind::AssocConst, ValueNS), | |
3c0e092e | 1431 | AssocItemKind::Fn(box Fn { ref sig, .. }) => { |
6a06907d XL |
1432 | if sig.decl.has_self() { |
1433 | self.r.has_self.insert(def_id); | |
29967ef6 | 1434 | } |
6a06907d | 1435 | (DefKind::AssocFn, ValueNS) |
7cac9316 | 1436 | } |
2b03887a | 1437 | AssocItemKind::Type(..) => (DefKind::AssocTy, TypeNS), |
6a06907d XL |
1438 | AssocItemKind::MacCall(_) => bug!(), // handled above |
1439 | }; | |
9e0c209e | 1440 | |
6a06907d XL |
1441 | let parent = self.parent_scope.module; |
1442 | let expansion = self.parent_scope.expansion; | |
1443 | let res = Res::Def(def_kind, def_id); | |
1444 | self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion)); | |
29967ef6 | 1445 | } |
9e0c209e | 1446 | |
74b04a01 | 1447 | visit::walk_assoc_item(self, item, ctxt); |
e74abb32 XL |
1448 | } |
1449 | ||
416331ca | 1450 | fn visit_attribute(&mut self, attr: &'b ast::Attribute) { |
60c5eb7d | 1451 | if !attr.is_doc_comment() && attr::is_builtin_attr(attr) { |
dfeec247 XL |
1452 | self.r |
1453 | .builtin_attrs | |
1454 | .push((attr.get_normal_item().path.segments[0].ident, self.parent_scope)); | |
b7449926 XL |
1455 | } |
1456 | visit::walk_attribute(self, attr); | |
1457 | } | |
e1599b0c XL |
1458 | |
1459 | fn visit_arm(&mut self, arm: &'b ast::Arm) { | |
1460 | if arm.is_placeholder { | |
1461 | self.visit_invoc(arm.id); | |
1462 | } else { | |
1463 | visit::walk_arm(self, arm); | |
1464 | } | |
1465 | } | |
1466 | ||
6a06907d | 1467 | fn visit_expr_field(&mut self, f: &'b ast::ExprField) { |
e1599b0c XL |
1468 | if f.is_placeholder { |
1469 | self.visit_invoc(f.id); | |
1470 | } else { | |
6a06907d | 1471 | visit::walk_expr_field(self, f); |
e1599b0c XL |
1472 | } |
1473 | } | |
1474 | ||
6a06907d | 1475 | fn visit_pat_field(&mut self, fp: &'b ast::PatField) { |
e1599b0c XL |
1476 | if fp.is_placeholder { |
1477 | self.visit_invoc(fp.id); | |
1478 | } else { | |
6a06907d | 1479 | visit::walk_pat_field(self, fp); |
e1599b0c XL |
1480 | } |
1481 | } | |
1482 | ||
1483 | fn visit_generic_param(&mut self, param: &'b ast::GenericParam) { | |
1484 | if param.is_placeholder { | |
1485 | self.visit_invoc(param.id); | |
1486 | } else { | |
1487 | visit::walk_generic_param(self, param); | |
1488 | } | |
1489 | } | |
1490 | ||
1491 | fn visit_param(&mut self, p: &'b ast::Param) { | |
1492 | if p.is_placeholder { | |
1493 | self.visit_invoc(p.id); | |
1494 | } else { | |
1495 | visit::walk_param(self, p); | |
1496 | } | |
1497 | } | |
1498 | ||
6a06907d | 1499 | fn visit_field_def(&mut self, sf: &'b ast::FieldDef) { |
e1599b0c XL |
1500 | if sf.is_placeholder { |
1501 | self.visit_invoc(sf.id); | |
1502 | } else { | |
29967ef6 XL |
1503 | let vis = self.resolve_visibility(&sf.vis); |
1504 | self.r.visibilities.insert(self.r.local_def_id(sf.id), vis); | |
6a06907d | 1505 | visit::walk_field_def(self, sf); |
e1599b0c XL |
1506 | } |
1507 | } | |
1508 | ||
1509 | // Constructs the reduced graph for one variant. Variants exist in the | |
1510 | // type and value namespaces. | |
1511 | fn visit_variant(&mut self, variant: &'b ast::Variant) { | |
1512 | if variant.is_placeholder { | |
fc512014 | 1513 | self.visit_invoc_in_module(variant.id); |
e1599b0c XL |
1514 | return; |
1515 | } | |
1516 | ||
1517 | let parent = self.parent_scope.module; | |
e1599b0c XL |
1518 | let expn_id = self.parent_scope.expansion; |
1519 | let ident = variant.ident; | |
1520 | ||
1521 | // Define a name in the type namespace. | |
29967ef6 XL |
1522 | let def_id = self.r.local_def_id(variant.id); |
1523 | let res = Res::Def(DefKind::Variant, def_id.to_def_id()); | |
6a06907d | 1524 | let vis = self.resolve_visibility(&variant.vis); |
e1599b0c | 1525 | self.r.define(parent, ident, TypeNS, (res, vis, variant.span, expn_id)); |
29967ef6 | 1526 | self.r.visibilities.insert(def_id, vis); |
e1599b0c | 1527 | |
29967ef6 | 1528 | // If the variant is marked as non_exhaustive then lower the visibility to within the crate. |
f2b60f7d | 1529 | let ctor_vis = if vis.is_public() |
9ffffee4 | 1530 | && self.r.tcx.sess.contains_name(&variant.attrs, sym::non_exhaustive) |
29967ef6 | 1531 | { |
f2b60f7d | 1532 | ty::Visibility::Restricted(CRATE_DEF_ID) |
29967ef6 XL |
1533 | } else { |
1534 | vis | |
1535 | }; | |
e1599b0c XL |
1536 | |
1537 | // Define a constructor name in the value namespace. | |
487cf647 FG |
1538 | if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(&variant.data) { |
1539 | let ctor_def_id = self.r.local_def_id(ctor_node_id); | |
1540 | let ctor_res = | |
1541 | Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id.to_def_id()); | |
1542 | self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, variant.span, expn_id)); | |
29967ef6 XL |
1543 | self.r.visibilities.insert(ctor_def_id, ctor_vis); |
1544 | } | |
487cf647 | 1545 | |
3dfed10e | 1546 | // Record field names for error reporting. |
487cf647 | 1547 | self.insert_field_names_local(def_id.to_def_id(), &variant.data); |
9c376795 | 1548 | self.insert_field_visibilities_local(def_id.to_def_id(), &variant.data); |
e1599b0c XL |
1549 | |
1550 | visit::walk_variant(self, variant); | |
1551 | } | |
a2a8927a XL |
1552 | |
1553 | fn visit_crate(&mut self, krate: &'b ast::Crate) { | |
1554 | if krate.is_placeholder { | |
1555 | self.visit_invoc_in_module(krate.id); | |
1556 | } else { | |
1557 | visit::walk_crate(self, krate); | |
1558 | self.contains_macro_use(&krate.attrs); | |
1559 | } | |
1560 | } | |
1a4d82fc | 1561 | } |