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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}; |
ee023bcb | 12 | use crate::{Determinacy, ExternPreludeEntry, Finalize, Module, ModuleKind, ModuleOrUniformRoot}; |
c295e0f8 XL |
13 | use crate::{NameBinding, NameBindingKind, ParentScope, PathResult, PerNS, ResolutionError}; |
14 | use crate::{Resolver, ResolverArenas, Segment, ToNameBinding, VisResolutionError}; | |
1a4d82fc | 15 | |
74b04a01 | 16 | use rustc_ast::visit::{self, AssocCtxt, Visitor}; |
5869c6ff | 17 | use rustc_ast::{self as ast, AssocItem, AssocItemKind, MetaItemKind, StmtKind}; |
3c0e092e | 18 | use rustc_ast::{Block, Fn, ForeignItem, ForeignItemKind, Impl, Item, ItemKind, NodeId}; |
f035d41b | 19 | use rustc_ast_lowering::ResolverAstLowering; |
74b04a01 | 20 | use rustc_attr as attr; |
0531ce1d | 21 | use rustc_data_structures::sync::Lrc; |
dfeec247 XL |
22 | use rustc_errors::{struct_span_err, Applicability}; |
23 | use rustc_expand::base::SyntaxExtension; | |
24 | use rustc_expand::expand::AstFragment; | |
25 | use rustc_hir::def::{self, *}; | |
f9f354fc | 26 | use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_INDEX}; |
dfeec247 | 27 | use rustc_metadata::creader::LoadedMacro; |
ba9703b0 | 28 | use rustc_middle::bug; |
5099ac24 | 29 | use rustc_middle::metadata::ModChild; |
ba9703b0 | 30 | use rustc_middle::ty; |
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. | |
e1599b0c | 84 | 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, | |
115 | None => { | |
116 | def_id.index = | |
117 | self.def_key(def_id).parent.expect("non-root `DefId` without parent") | |
118 | } | |
119 | } | |
29967ef6 | 120 | } |
29967ef6 XL |
121 | } |
122 | ||
c295e0f8 XL |
123 | pub fn expect_module(&mut self, def_id: DefId) -> Module<'a> { |
124 | self.get_module(def_id).expect("argument `DefId` is not a module") | |
125 | } | |
416331ca | 126 | |
c295e0f8 XL |
127 | /// If `def_id` refers to a module (in resolver's sense, i.e. a module item, crate root, enum, |
128 | /// or trait), then this function returns that module's resolver representation, otherwise it | |
129 | /// returns `None`. | |
130 | crate fn get_module(&mut self, def_id: DefId) -> Option<Module<'a>> { | |
131 | if let module @ Some(..) = self.module_map.get(&def_id) { | |
132 | return module.copied(); | |
416331ca XL |
133 | } |
134 | ||
c295e0f8 XL |
135 | if !def_id.is_local() { |
136 | let def_kind = self.cstore().def_kind(def_id); | |
137 | match def_kind { | |
138 | DefKind::Mod | DefKind::Enum | DefKind::Trait => { | |
139 | let def_key = self.cstore().def_key(def_id); | |
140 | let parent = def_key.parent.map(|index| { | |
141 | self.get_nearest_non_block_module(DefId { index, krate: def_id.krate }) | |
142 | }); | |
143 | let name = if def_id.index == CRATE_DEF_INDEX { | |
144 | self.cstore().crate_name(def_id.krate) | |
145 | } else { | |
146 | def_key.disambiguated_data.data.get_opt_name().expect("module without name") | |
147 | }; | |
416331ca | 148 | |
c295e0f8 XL |
149 | Some(self.new_module( |
150 | parent, | |
151 | ModuleKind::Def(def_kind, def_id, name), | |
3c0e092e | 152 | self.cstore().module_expansion_untracked(def_id, &self.session), |
c295e0f8 XL |
153 | self.cstore().get_span_untracked(def_id, &self.session), |
154 | // FIXME: Account for `#[no_implicit_prelude]` attributes. | |
155 | parent.map_or(false, |module| module.no_implicit_prelude), | |
156 | )) | |
157 | } | |
158 | _ => None, | |
159 | } | |
160 | } else { | |
161 | None | |
162 | } | |
416331ca XL |
163 | } |
164 | ||
c295e0f8 XL |
165 | crate fn expn_def_scope(&mut self, expn_id: ExpnId) -> Module<'a> { |
166 | match expn_id.expn_data().macro_def_id { | |
167 | Some(def_id) => self.macro_def_scope(def_id), | |
168 | None => expn_id | |
169 | .as_local() | |
170 | .and_then(|expn_id| self.ast_transform_scopes.get(&expn_id)) | |
171 | .unwrap_or(&self.graph_root), | |
172 | } | |
136023e0 XL |
173 | } |
174 | ||
c295e0f8 | 175 | crate fn macro_def_scope(&mut self, def_id: DefId) -> Module<'a> { |
f9f354fc | 176 | if let Some(id) = def_id.as_local() { |
416331ca XL |
177 | self.local_macro_def_scopes[&id] |
178 | } else { | |
c295e0f8 | 179 | self.get_nearest_non_block_module(def_id) |
416331ca XL |
180 | } |
181 | } | |
182 | ||
183 | crate fn get_macro(&mut self, res: Res) -> Option<Lrc<SyntaxExtension>> { | |
184 | match res { | |
5869c6ff | 185 | Res::Def(DefKind::Macro(..), def_id) => Some(self.get_macro_by_def_id(def_id)), |
94222f64 | 186 | Res::NonMacroAttr(_) => Some(self.non_macro_attr.clone()), |
416331ca XL |
187 | _ => None, |
188 | } | |
189 | } | |
190 | ||
5869c6ff | 191 | crate fn get_macro_by_def_id(&mut self, def_id: DefId) -> Lrc<SyntaxExtension> { |
416331ca | 192 | if let Some(ext) = self.macro_map.get(&def_id) { |
5869c6ff | 193 | return ext.clone(); |
416331ca XL |
194 | } |
195 | ||
e74abb32 XL |
196 | let ext = Lrc::new(match self.cstore().load_macro_untracked(def_id, &self.session) { |
197 | LoadedMacro::MacroDef(item, edition) => self.compile_macro(&item, edition), | |
e1599b0c XL |
198 | LoadedMacro::ProcMacro(ext) => ext, |
199 | }); | |
416331ca | 200 | |
416331ca | 201 | self.macro_map.insert(def_id, ext.clone()); |
5869c6ff | 202 | ext |
416331ca XL |
203 | } |
204 | ||
e1599b0c XL |
205 | crate fn build_reduced_graph( |
206 | &mut self, | |
207 | fragment: &AstFragment, | |
e1599b0c | 208 | parent_scope: ParentScope<'a>, |
29967ef6 | 209 | ) -> MacroRulesScopeRef<'a> { |
f035d41b | 210 | collect_definitions(self, fragment, parent_scope.expansion); |
e1599b0c XL |
211 | let mut visitor = BuildReducedGraphVisitor { r: self, parent_scope }; |
212 | fragment.visit_with(&mut visitor); | |
ba9703b0 | 213 | visitor.parent_scope.macro_rules |
e1599b0c XL |
214 | } |
215 | ||
216 | crate fn build_reduced_graph_external(&mut self, module: Module<'a>) { | |
5099ac24 | 217 | for child in self.cstore().module_children_untracked(module.def_id(), self.session) { |
29967ef6 XL |
218 | let parent_scope = ParentScope::module(module, self); |
219 | BuildReducedGraphVisitor { r: self, parent_scope } | |
e1599b0c | 220 | .build_reduced_graph_for_external_crate_res(child); |
416331ca | 221 | } |
416331ca XL |
222 | } |
223 | } | |
224 | ||
e1599b0c XL |
225 | struct BuildReducedGraphVisitor<'a, 'b> { |
226 | r: &'b mut Resolver<'a>, | |
227 | parent_scope: ParentScope<'a>, | |
228 | } | |
229 | ||
230 | impl<'a> AsMut<Resolver<'a>> for BuildReducedGraphVisitor<'a, '_> { | |
dfeec247 XL |
231 | fn as_mut(&mut self) -> &mut Resolver<'a> { |
232 | self.r | |
233 | } | |
416331ca XL |
234 | } |
235 | ||
236 | impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> { | |
237 | fn resolve_visibility(&mut self, vis: &ast::Visibility) -> ty::Visibility { | |
ee023bcb | 238 | self.try_resolve_visibility(vis, true).unwrap_or_else(|err| { |
e74abb32 XL |
239 | self.r.report_vis_error(err); |
240 | ty::Visibility::Public | |
241 | }) | |
242 | } | |
243 | ||
ee023bcb | 244 | fn try_resolve_visibility<'ast>( |
e74abb32 XL |
245 | &mut self, |
246 | vis: &'ast ast::Visibility, | |
ee023bcb | 247 | finalize: bool, |
e74abb32 | 248 | ) -> Result<ty::Visibility, VisResolutionError<'ast>> { |
416331ca | 249 | let parent_scope = &self.parent_scope; |
1b1a35ee | 250 | match vis.kind { |
e74abb32 | 251 | ast::VisibilityKind::Public => Ok(ty::Visibility::Public), |
416331ca | 252 | ast::VisibilityKind::Crate(..) => { |
e74abb32 | 253 | Ok(ty::Visibility::Restricted(DefId::local(CRATE_DEF_INDEX))) |
416331ca XL |
254 | } |
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, .. } => { | |
268 | // For visibilities we are not ready to provide correct implementation of "uniform | |
269 | // paths" right now, so on 2018 edition we only allow module-relative paths for now. | |
270 | // On 2015 edition visibilities are resolved as crate-relative by default, | |
271 | // so we are prepending a root segment if necessary. | |
272 | let ident = path.segments.get(0).expect("empty path in visibility").ident; | |
273 | let crate_root = if ident.is_path_segment_keyword() { | |
274 | None | |
e74abb32 | 275 | } else if ident.span.rust_2015() { |
416331ca | 276 | Some(Segment::from_ident(Ident::new( |
dfeec247 XL |
277 | kw::PathRoot, |
278 | path.span.shrink_to_lo().with_ctxt(ident.span.ctxt()), | |
416331ca | 279 | ))) |
e74abb32 XL |
280 | } else { |
281 | return Err(VisResolutionError::Relative2018(ident.span, path)); | |
416331ca XL |
282 | }; |
283 | ||
dfeec247 XL |
284 | let segments = crate_root |
285 | .into_iter() | |
286 | .chain(path.segments.iter().map(|seg| seg.into())) | |
287 | .collect::<Vec<_>>(); | |
288 | let expected_found_error = |res| { | |
289 | Err(VisResolutionError::ExpectedFound( | |
290 | path.span, | |
291 | Segment::names_to_string(&segments), | |
292 | res, | |
293 | )) | |
294 | }; | |
416331ca XL |
295 | match self.r.resolve_path( |
296 | &segments, | |
297 | Some(TypeNS), | |
298 | parent_scope, | |
ee023bcb | 299 | if finalize { Finalize::SimplePath(id, path.span) } else { Finalize::No }, |
416331ca XL |
300 | ) { |
301 | PathResult::Module(ModuleOrUniformRoot::Module(module)) => { | |
302 | let res = module.res().expect("visibility resolved to unnamed block"); | |
ee023bcb | 303 | if finalize { |
e74abb32 XL |
304 | self.r.record_partial_res(id, PartialRes::new(res)); |
305 | } | |
416331ca XL |
306 | if module.is_normal() { |
307 | if res == Res::Err { | |
e74abb32 | 308 | Ok(ty::Visibility::Public) |
416331ca XL |
309 | } else { |
310 | let vis = ty::Visibility::Restricted(res.def_id()); | |
311 | if self.r.is_accessible_from(vis, parent_scope.module) { | |
e74abb32 | 312 | Ok(vis) |
416331ca | 313 | } else { |
e74abb32 | 314 | Err(VisResolutionError::AncestorOnly(path.span)) |
416331ca XL |
315 | } |
316 | } | |
317 | } else { | |
e74abb32 | 318 | expected_found_error(res) |
416331ca XL |
319 | } |
320 | } | |
dfeec247 XL |
321 | PathResult::Module(..) => Err(VisResolutionError::ModuleOnly(path.span)), |
322 | PathResult::NonModule(partial_res) => { | |
323 | expected_found_error(partial_res.base_res()) | |
324 | } | |
325 | PathResult::Failed { span, label, suggestion, .. } => { | |
326 | Err(VisResolutionError::FailedToResolve(span, label, suggestion)) | |
327 | } | |
328 | PathResult::Indeterminate => Err(VisResolutionError::Indeterminate(path.span)), | |
416331ca XL |
329 | } |
330 | } | |
331 | } | |
332 | } | |
333 | ||
e74abb32 | 334 | fn insert_field_names_local(&mut self, def_id: DefId, vdata: &ast::VariantData) { |
dfeec247 XL |
335 | let field_names = vdata |
336 | .fields() | |
337 | .iter() | |
5869c6ff | 338 | .map(|field| respan(field.span, field.ident.map_or(kw::Empty, |ident| ident.name))) |
dfeec247 | 339 | .collect(); |
e74abb32 XL |
340 | self.insert_field_names(def_id, field_names); |
341 | } | |
342 | ||
f9f354fc | 343 | fn insert_field_names(&mut self, def_id: DefId, field_names: Vec<Spanned<Symbol>>) { |
3dfed10e | 344 | self.r.field_names.insert(def_id, field_names); |
416331ca XL |
345 | } |
346 | ||
1a4d82fc | 347 | fn block_needs_anonymous_module(&mut self, block: &Block) -> bool { |
7453a54e | 348 | // If any statements are items, we need to create an anonymous module |
29967ef6 XL |
349 | block |
350 | .stmts | |
351 | .iter() | |
352 | .any(|statement| matches!(statement.kind, StmtKind::Item(_) | StmtKind::MacCall(_))) | |
a7813a04 XL |
353 | } |
354 | ||
74b04a01 XL |
355 | // Add an import to the current module. |
356 | fn add_import( | |
416331ca XL |
357 | &mut self, |
358 | module_path: Vec<Segment>, | |
74b04a01 | 359 | kind: ImportKind<'a>, |
416331ca XL |
360 | span: Span, |
361 | id: NodeId, | |
362 | item: &ast::Item, | |
363 | root_span: Span, | |
364 | root_id: NodeId, | |
365 | vis: ty::Visibility, | |
366 | ) { | |
e1599b0c | 367 | let current_module = self.parent_scope.module; |
74b04a01 XL |
368 | let import = self.r.arenas.alloc_import(Import { |
369 | kind, | |
e1599b0c | 370 | parent_scope: self.parent_scope, |
416331ca XL |
371 | module_path, |
372 | imported_module: Cell::new(None), | |
416331ca XL |
373 | span, |
374 | id, | |
375 | use_span: item.span, | |
376 | use_span_with_attributes: item.span_with_attributes(), | |
377 | has_attributes: !item.attrs.is_empty(), | |
378 | root_span, | |
379 | root_id, | |
380 | vis: Cell::new(vis), | |
381 | used: Cell::new(false), | |
382 | }); | |
383 | ||
74b04a01 XL |
384 | self.r.indeterminate_imports.push(import); |
385 | match import.kind { | |
e74abb32 | 386 | // Don't add unresolved underscore imports to modules |
74b04a01 XL |
387 | ImportKind::Single { target: Ident { name: kw::Underscore, .. }, .. } => {} |
388 | ImportKind::Single { target, type_ns_only, .. } => { | |
dfeec247 XL |
389 | self.r.per_ns(|this, ns| { |
390 | if !type_ns_only || ns == TypeNS { | |
391 | let key = this.new_key(target, ns); | |
392 | let mut resolution = this.resolution(current_module, key).borrow_mut(); | |
74b04a01 | 393 | resolution.add_single_import(import); |
dfeec247 | 394 | } |
416331ca XL |
395 | }); |
396 | } | |
397 | // We don't add prelude imports to the globs since they only affect lexical scopes, | |
398 | // which are not relevant to import resolution. | |
74b04a01 XL |
399 | ImportKind::Glob { is_prelude: true, .. } => {} |
400 | ImportKind::Glob { .. } => current_module.globs.borrow_mut().push(import), | |
416331ca | 401 | _ => unreachable!(), |
c30ab7b3 SL |
402 | } |
403 | } | |
9e0c209e | 404 | |
b7449926 XL |
405 | fn build_reduced_graph_for_use_tree( |
406 | &mut self, | |
0bf4aa26 | 407 | // This particular use tree |
b7449926 XL |
408 | use_tree: &ast::UseTree, |
409 | id: NodeId, | |
13cf67c4 | 410 | parent_prefix: &[Segment], |
b7449926 | 411 | nested: bool, |
0bf4aa26 | 412 | // The whole `use` item |
b7449926 | 413 | item: &Item, |
0bf4aa26 XL |
414 | vis: ty::Visibility, |
415 | root_span: Span, | |
b7449926 | 416 | ) { |
dfeec247 XL |
417 | debug!( |
418 | "build_reduced_graph_for_use_tree(parent_prefix={:?}, use_tree={:?}, nested={})", | |
419 | parent_prefix, use_tree, nested | |
420 | ); | |
13cf67c4 | 421 | |
dfeec247 XL |
422 | let mut prefix_iter = parent_prefix |
423 | .iter() | |
424 | .cloned() | |
425 | .chain(use_tree.prefix.segments.iter().map(|seg| seg.into())) | |
426 | .peekable(); | |
13cf67c4 XL |
427 | |
428 | // On 2015 edition imports are resolved as crate-relative by default, | |
429 | // so prefixes are prepended with crate root segment if necessary. | |
430 | // The root is prepended lazily, when the first non-empty prefix or terminating glob | |
431 | // appears, so imports in braced groups can have roots prepended independently. | |
1b1a35ee | 432 | let is_glob = matches!(use_tree.kind, ast::UseTreeKind::Glob); |
13cf67c4 | 433 | let crate_root = match prefix_iter.peek() { |
532ac7d7 | 434 | Some(seg) if !seg.ident.is_path_segment_keyword() && seg.ident.span.rust_2015() => { |
13cf67c4 | 435 | Some(seg.ident.span.ctxt()) |
b7449926 | 436 | } |
dfeec247 | 437 | None if is_glob && use_tree.span.rust_2015() => Some(use_tree.span.ctxt()), |
13cf67c4 | 438 | _ => None, |
dfeec247 XL |
439 | } |
440 | .map(|ctxt| { | |
441 | Segment::from_ident(Ident::new( | |
442 | kw::PathRoot, | |
443 | use_tree.prefix.span.shrink_to_lo().with_ctxt(ctxt), | |
444 | )) | |
445 | }); | |
b7449926 | 446 | |
13cf67c4 XL |
447 | let prefix = crate_root.into_iter().chain(prefix_iter).collect::<Vec<_>>(); |
448 | debug!("build_reduced_graph_for_use_tree: prefix={:?}", prefix); | |
ff7c6d11 | 449 | |
13cf67c4 | 450 | let empty_for_self = |prefix: &[Segment]| { |
dfeec247 | 451 | prefix.is_empty() || prefix.len() == 1 && prefix[0].ident.name == kw::PathRoot |
0bf4aa26 | 452 | }; |
ff7c6d11 | 453 | match use_tree.kind { |
5099ac24 | 454 | ast::UseTreeKind::Simple(rename, id1, id2) => { |
e74abb32 | 455 | let mut ident = use_tree.ident(); |
b7449926 | 456 | let mut module_path = prefix; |
83c7162d | 457 | let mut source = module_path.pop().unwrap(); |
ff7c6d11 XL |
458 | let mut type_ns_only = false; |
459 | ||
460 | if nested { | |
461 | // Correctly handle `self` | |
dc9dc135 | 462 | if source.ident.name == kw::SelfLower { |
ff7c6d11 XL |
463 | type_ns_only = true; |
464 | ||
0bf4aa26 | 465 | if empty_for_self(&module_path) { |
416331ca | 466 | self.r.report_error( |
ff7c6d11 | 467 | use_tree.span, |
dfeec247 | 468 | ResolutionError::SelfImportOnlyInImportListWithNonEmptyPrefix, |
ff7c6d11 XL |
469 | ); |
470 | return; | |
471 | } | |
1a4d82fc | 472 | |
f9f354fc | 473 | // Replace `use foo::{ self };` with `use foo;` |
b7449926 | 474 | source = module_path.pop().unwrap(); |
0531ce1d | 475 | if rename.is_none() { |
13cf67c4 | 476 | ident = source.ident; |
ff7c6d11 | 477 | } |
85aaf69f | 478 | } |
ff7c6d11 XL |
479 | } else { |
480 | // Disallow `self` | |
dc9dc135 | 481 | if source.ident.name == kw::SelfLower { |
f9f354fc XL |
482 | let parent = module_path.last(); |
483 | ||
484 | let span = match parent { | |
485 | // only `::self` from `use foo::self as bar` | |
486 | Some(seg) => seg.ident.span.shrink_to_hi().to(source.ident.span), | |
487 | None => source.ident.span, | |
488 | }; | |
489 | let span_with_rename = match rename { | |
490 | // only `self as bar` from `use foo::self as bar` | |
491 | Some(rename) => source.ident.span.to(rename.span), | |
492 | None => source.ident.span, | |
493 | }; | |
416331ca | 494 | self.r.report_error( |
f9f354fc XL |
495 | span, |
496 | ResolutionError::SelfImportsOnlyAllowedWithin { | |
497 | root: parent.is_none(), | |
498 | span_with_rename, | |
499 | }, | |
416331ca | 500 | ); |
f9f354fc XL |
501 | |
502 | // Error recovery: replace `use foo::self;` with `use foo;` | |
503 | if let Some(parent) = module_path.pop() { | |
504 | source = parent; | |
505 | if rename.is_none() { | |
506 | ident = source.ident; | |
507 | } | |
508 | } | |
85aaf69f | 509 | } |
85aaf69f | 510 | |
ff7c6d11 | 511 | // Disallow `use $crate;` |
dc9dc135 | 512 | if source.ident.name == kw::DollarCrate && module_path.is_empty() { |
416331ca | 513 | let crate_root = self.r.resolve_crate_root(source.ident); |
ff7c6d11 | 514 | let crate_name = match crate_root.kind { |
48663c56 | 515 | ModuleKind::Def(.., name) => name, |
ff7c6d11 XL |
516 | ModuleKind::Block(..) => unreachable!(), |
517 | }; | |
b7449926 | 518 | // HACK(eddyb) unclear how good this is, but keeping `$crate` |
5869c6ff | 519 | // in `source` breaks `src/test/ui/imports/import-crate-var.rs`, |
b7449926 | 520 | // while the current crate doesn't have a valid `crate_name`. |
5869c6ff | 521 | if crate_name != kw::Empty { |
b7449926 | 522 | // `crate_name` should not be interpreted as relative. |
13cf67c4 | 523 | module_path.push(Segment { |
dfeec247 | 524 | ident: Ident { name: kw::PathRoot, span: source.ident.span }, |
60c5eb7d | 525 | id: Some(self.r.next_node_id()), |
f035d41b | 526 | has_generic_args: false, |
b7449926 | 527 | }); |
13cf67c4 | 528 | source.ident.name = crate_name; |
b7449926 | 529 | } |
0531ce1d | 530 | if rename.is_none() { |
ff7c6d11 | 531 | ident.name = crate_name; |
85aaf69f SL |
532 | } |
533 | ||
dfeec247 XL |
534 | self.r |
535 | .session | |
536 | .struct_span_err(item.span, "`$crate` may not be imported") | |
ff7c6d11 | 537 | .emit(); |
85aaf69f | 538 | } |
ff7c6d11 | 539 | } |
85aaf69f | 540 | |
dc9dc135 | 541 | if ident.name == kw::Crate { |
dfeec247 XL |
542 | self.r.session.span_err( |
543 | ident.span, | |
b7449926 | 544 | "crate root imports need to be explicitly named: \ |
dfeec247 XL |
545 | `use crate as name;`", |
546 | ); | |
b7449926 XL |
547 | } |
548 | ||
74b04a01 | 549 | let kind = ImportKind::Single { |
13cf67c4 | 550 | source: source.ident, |
69743fb6 XL |
551 | target: ident, |
552 | source_bindings: PerNS { | |
416331ca XL |
553 | type_ns: Cell::new(Err(Determinacy::Undetermined)), |
554 | value_ns: Cell::new(Err(Determinacy::Undetermined)), | |
555 | macro_ns: Cell::new(Err(Determinacy::Undetermined)), | |
83c7162d | 556 | }, |
69743fb6 XL |
557 | target_bindings: PerNS { |
558 | type_ns: Cell::new(None), | |
559 | value_ns: Cell::new(None), | |
560 | macro_ns: Cell::new(None), | |
561 | }, | |
ff7c6d11 | 562 | type_ns_only, |
9fa01778 | 563 | nested, |
5099ac24 | 564 | additional_ids: (id1, id2), |
ff7c6d11 | 565 | }; |
5099ac24 | 566 | |
74b04a01 | 567 | self.add_import( |
94b46f34 | 568 | module_path, |
74b04a01 | 569 | kind, |
94b46f34 XL |
570 | use_tree.span, |
571 | id, | |
9fa01778 | 572 | item, |
0bf4aa26 XL |
573 | root_span, |
574 | item.id, | |
94b46f34 | 575 | vis, |
ff7c6d11 XL |
576 | ); |
577 | } | |
578 | ast::UseTreeKind::Glob => { | |
74b04a01 | 579 | let kind = ImportKind::Glob { |
3dfed10e | 580 | is_prelude: self.r.session.contains_name(&item.attrs, sym::prelude_import), |
ff7c6d11 XL |
581 | max_vis: Cell::new(ty::Visibility::Invisible), |
582 | }; | |
74b04a01 | 583 | self.add_import(prefix, kind, use_tree.span, id, item, root_span, item.id, vis); |
ff7c6d11 XL |
584 | } |
585 | ast::UseTreeKind::Nested(ref items) => { | |
ff7c6d11 | 586 | // Ensure there is at most one `self` in the list |
dfeec247 XL |
587 | let self_spans = items |
588 | .iter() | |
589 | .filter_map(|&(ref use_tree, _)| { | |
590 | if let ast::UseTreeKind::Simple(..) = use_tree.kind { | |
591 | if use_tree.ident().name == kw::SelfLower { | |
592 | return Some(use_tree.span); | |
593 | } | |
85aaf69f | 594 | } |
ff7c6d11 | 595 | |
dfeec247 XL |
596 | None |
597 | }) | |
598 | .collect::<Vec<_>>(); | |
ff7c6d11 | 599 | if self_spans.len() > 1 { |
416331ca | 600 | let mut e = self.r.into_struct_error( |
ff7c6d11 | 601 | self_spans[0], |
dfeec247 XL |
602 | ResolutionError::SelfImportCanOnlyAppearOnceInTheList, |
603 | ); | |
ff7c6d11 XL |
604 | |
605 | for other_span in self_spans.iter().skip(1) { | |
606 | e.span_label(*other_span, "another `self` import appears here"); | |
85aaf69f | 607 | } |
ff7c6d11 XL |
608 | |
609 | e.emit(); | |
85aaf69f | 610 | } |
ff7c6d11 XL |
611 | |
612 | for &(ref tree, id) in items { | |
613 | self.build_reduced_graph_for_use_tree( | |
0bf4aa26 | 614 | // This particular use tree |
dfeec247 | 615 | tree, id, &prefix, true, // The whole `use` item |
416331ca | 616 | item, vis, root_span, |
0bf4aa26 XL |
617 | ); |
618 | } | |
619 | ||
620 | // Empty groups `a::b::{}` are turned into synthetic `self` imports | |
dc9dc135 | 621 | // `a::b::c::{self as _}`, so that their prefixes are correctly |
0bf4aa26 XL |
622 | // resolved and checked for privacy/stability/etc. |
623 | if items.is_empty() && !empty_for_self(&prefix) { | |
13cf67c4 | 624 | let new_span = prefix[prefix.len() - 1].ident.span; |
0bf4aa26 | 625 | let tree = ast::UseTree { |
dfeec247 | 626 | prefix: ast::Path::from_ident(Ident::new(kw::SelfLower, new_span)), |
0bf4aa26 | 627 | kind: ast::UseTreeKind::Simple( |
dc9dc135 | 628 | Some(Ident::new(kw::Underscore, new_span)), |
0bf4aa26 XL |
629 | ast::DUMMY_NODE_ID, |
630 | ast::DUMMY_NODE_ID, | |
631 | ), | |
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 XL |
641 | item, |
642 | ty::Visibility::Invisible, | |
643 | root_span, | |
ff7c6d11 XL |
644 | ); |
645 | } | |
646 | } | |
647 | } | |
648 | } | |
649 | ||
650 | /// Constructs the reduced graph for one item. | |
e1599b0c | 651 | fn build_reduced_graph_for_item(&mut self, item: &'b Item) { |
416331ca | 652 | let parent_scope = &self.parent_scope; |
0bf4aa26 XL |
653 | let parent = parent_scope.module; |
654 | let expansion = parent_scope.expansion; | |
e74abb32 | 655 | let ident = item.ident; |
ff7c6d11 XL |
656 | let sp = item.span; |
657 | let vis = self.resolve_visibility(&item.vis); | |
29967ef6 XL |
658 | let local_def_id = self.r.local_def_id(item.id); |
659 | let def_id = local_def_id.to_def_id(); | |
660 | ||
661 | self.r.visibilities.insert(local_def_id, vis); | |
ff7c6d11 | 662 | |
e74abb32 | 663 | match item.kind { |
ff7c6d11 | 664 | ItemKind::Use(ref use_tree) => { |
ff7c6d11 | 665 | self.build_reduced_graph_for_use_tree( |
0bf4aa26 | 666 | // This particular use tree |
dfeec247 XL |
667 | use_tree, |
668 | item.id, | |
669 | &[], | |
670 | false, | |
0bf4aa26 | 671 | // The whole `use` item |
dfeec247 XL |
672 | item, |
673 | vis, | |
674 | use_tree.span, | |
ff7c6d11 | 675 | ); |
85aaf69f SL |
676 | } |
677 | ||
0531ce1d | 678 | ItemKind::ExternCrate(orig_name) => { |
a2a8927a XL |
679 | self.build_reduced_graph_for_extern_crate( |
680 | orig_name, | |
681 | item, | |
682 | local_def_id, | |
683 | vis, | |
684 | parent, | |
685 | ); | |
85aaf69f SL |
686 | } |
687 | ||
a7813a04 | 688 | ItemKind::Mod(..) => { |
c295e0f8 XL |
689 | let module = self.r.new_module( |
690 | Some(parent), | |
691 | ModuleKind::Def(DefKind::Mod, def_id, ident.name), | |
692 | expansion.to_expn_id(), | |
693 | item.span, | |
694 | parent.no_implicit_prelude | |
695 | || self.r.session.contains_name(&item.attrs, sym::no_implicit_prelude), | |
696 | ); | |
416331ca | 697 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
9e0c209e SL |
698 | |
699 | // Descend into the module. | |
416331ca | 700 | self.parent_scope.module = module; |
1a4d82fc JJ |
701 | } |
702 | ||
1a4d82fc | 703 | // These items live in the value namespace. |
ee023bcb FG |
704 | ItemKind::Static(_, mt, _) => { |
705 | let res = Res::Def(DefKind::Static(mt), def_id); | |
416331ca | 706 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
1a4d82fc | 707 | } |
9e0c209e | 708 | ItemKind::Const(..) => { |
29967ef6 | 709 | let res = Res::Def(DefKind::Const, def_id); |
416331ca | 710 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
1a4d82fc | 711 | } |
9e0c209e | 712 | ItemKind::Fn(..) => { |
29967ef6 | 713 | let res = Res::Def(DefKind::Fn, def_id); |
416331ca | 714 | self.r.define(parent, ident, ValueNS, (res, vis, sp, expansion)); |
8faf50e0 XL |
715 | |
716 | // Functions introducing procedural macros reserve a slot | |
717 | // in the macro namespace as well (see #52225). | |
416331ca | 718 | self.define_macro(item); |
1a4d82fc JJ |
719 | } |
720 | ||
721 | // These items live in the type namespace. | |
f035d41b | 722 | ItemKind::TyAlias(..) => { |
29967ef6 | 723 | let res = Res::Def(DefKind::TyAlias, def_id); |
416331ca | 724 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
8faf50e0 XL |
725 | } |
726 | ||
e1599b0c | 727 | ItemKind::Enum(_, _) => { |
dfeec247 | 728 | let module = self.r.new_module( |
c295e0f8 XL |
729 | Some(parent), |
730 | ModuleKind::Def(DefKind::Enum, def_id, ident.name), | |
136023e0 | 731 | expansion.to_expn_id(), |
dfeec247 | 732 | item.span, |
c295e0f8 | 733 | parent.no_implicit_prelude, |
dfeec247 | 734 | ); |
416331ca | 735 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
e1599b0c | 736 | self.parent_scope.module = module; |
1a4d82fc JJ |
737 | } |
738 | ||
ff7c6d11 | 739 | ItemKind::TraitAlias(..) => { |
29967ef6 | 740 | let res = Res::Def(DefKind::TraitAlias, def_id); |
416331ca | 741 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
ff7c6d11 XL |
742 | } |
743 | ||
1a4d82fc | 744 | // These items live in both the type and value namespaces. |
e74abb32 | 745 | ItemKind::Struct(ref vdata, _) => { |
1a4d82fc | 746 | // Define a name in the type namespace. |
48663c56 | 747 | let res = Res::Def(DefKind::Struct, def_id); |
416331ca | 748 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
1a4d82fc | 749 | |
abe05a73 | 750 | // Record field names for error reporting. |
e74abb32 | 751 | self.insert_field_names_local(def_id, vdata); |
8bb4bdeb XL |
752 | |
753 | // If this is a tuple or unit struct, define a name | |
754 | // in the value namespace as well. | |
e74abb32 | 755 | if let Some(ctor_node_id) = vdata.ctor_id() { |
e74abb32 XL |
756 | // If the structure is marked as non_exhaustive then lower the visibility |
757 | // to within the crate. | |
ba9703b0 | 758 | let mut ctor_vis = if vis == ty::Visibility::Public |
3dfed10e | 759 | && self.r.session.contains_name(&item.attrs, sym::non_exhaustive) |
dfeec247 | 760 | { |
ba9703b0 XL |
761 | ty::Visibility::Restricted(DefId::local(CRATE_DEF_INDEX)) |
762 | } else { | |
763 | vis | |
764 | }; | |
765 | ||
1b1a35ee XL |
766 | let mut ret_fields = Vec::with_capacity(vdata.fields().len()); |
767 | ||
e74abb32 XL |
768 | for field in vdata.fields() { |
769 | // NOTE: The field may be an expansion placeholder, but expansion sets | |
770 | // correct visibilities for unnamed field placeholders specifically, so the | |
771 | // constructor visibility should still be determined correctly. | |
1b1a35ee | 772 | let field_vis = self |
ee023bcb | 773 | .try_resolve_visibility(&field.vis, false) |
1b1a35ee XL |
774 | .unwrap_or(ty::Visibility::Public); |
775 | if ctor_vis.is_at_least(field_vis, &*self.r) { | |
776 | ctor_vis = field_vis; | |
e74abb32 | 777 | } |
1b1a35ee | 778 | ret_fields.push(field_vis); |
e74abb32 | 779 | } |
29967ef6 | 780 | let ctor_def_id = self.r.local_def_id(ctor_node_id); |
48663c56 | 781 | let ctor_res = Res::Def( |
e74abb32 | 782 | DefKind::Ctor(CtorOf::Struct, CtorKind::from_ast(vdata)), |
29967ef6 | 783 | ctor_def_id.to_def_id(), |
48663c56 | 784 | ); |
416331ca | 785 | self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, sp, expansion)); |
29967ef6 XL |
786 | self.r.visibilities.insert(ctor_def_id, ctor_vis); |
787 | ||
1b1a35ee | 788 | self.r.struct_constructors.insert(def_id, (ctor_res, ctor_vis, ret_fields)); |
8bb4bdeb | 789 | } |
1a4d82fc JJ |
790 | } |
791 | ||
9e0c209e | 792 | ItemKind::Union(ref vdata, _) => { |
e74abb32 | 793 | let res = Res::Def(DefKind::Union, def_id); |
416331ca | 794 | self.r.define(parent, ident, TypeNS, (res, vis, sp, expansion)); |
1a4d82fc | 795 | |
c30ab7b3 | 796 | // Record field names for error reporting. |
e74abb32 | 797 | self.insert_field_names_local(def_id, vdata); |
416331ca | 798 | } |
1a4d82fc | 799 | |
9e0c209e | 800 | ItemKind::Trait(..) => { |
9e0c209e | 801 | // Add all the items within to a new module. |
dfeec247 | 802 | let module = self.r.new_module( |
c295e0f8 XL |
803 | Some(parent), |
804 | ModuleKind::Def(DefKind::Trait, def_id, ident.name), | |
136023e0 | 805 | expansion.to_expn_id(), |
dfeec247 | 806 | item.span, |
c295e0f8 | 807 | parent.no_implicit_prelude, |
dfeec247 | 808 | ); |
416331ca XL |
809 | self.r.define(parent, ident, TypeNS, (module, vis, sp, expansion)); |
810 | self.parent_scope.module = module; | |
1a4d82fc | 811 | } |
ff7c6d11 | 812 | |
e74abb32 | 813 | // These items do not add names to modules. |
3c0e092e | 814 | ItemKind::Impl(box Impl { of_trait: Some(..), .. }) => { |
29967ef6 XL |
815 | self.r.trait_impl_items.insert(local_def_id); |
816 | } | |
dfeec247 | 817 | ItemKind::Impl { .. } | ItemKind::ForeignMod(..) | ItemKind::GlobalAsm(..) => {} |
e74abb32 | 818 | |
ba9703b0 | 819 | ItemKind::MacroDef(..) | ItemKind::MacCall(_) => unreachable!(), |
1a4d82fc JJ |
820 | } |
821 | } | |
822 | ||
a2a8927a XL |
823 | fn build_reduced_graph_for_extern_crate( |
824 | &mut self, | |
825 | orig_name: Option<Symbol>, | |
826 | item: &Item, | |
827 | local_def_id: LocalDefId, | |
828 | vis: ty::Visibility, | |
829 | parent: Module<'a>, | |
830 | ) { | |
831 | let ident = item.ident; | |
832 | let sp = item.span; | |
833 | let parent_scope = self.parent_scope; | |
834 | let expansion = parent_scope.expansion; | |
835 | ||
836 | let (used, module, binding) = if orig_name.is_none() && ident.name == kw::SelfLower { | |
837 | self.r | |
838 | .session | |
839 | .struct_span_err(item.span, "`extern crate self;` requires renaming") | |
840 | .span_suggestion( | |
841 | item.span, | |
842 | "rename the `self` crate to be able to import it", | |
843 | "extern crate self as name;".into(), | |
844 | Applicability::HasPlaceholders, | |
845 | ) | |
846 | .emit(); | |
847 | return; | |
848 | } else if orig_name == Some(kw::SelfLower) { | |
849 | Some(self.r.graph_root) | |
850 | } else { | |
851 | self.r.crate_loader.process_extern_crate(item, &self.r.definitions, local_def_id).map( | |
852 | |crate_id| { | |
853 | self.r.extern_crate_map.insert(local_def_id, crate_id); | |
854 | self.r.expect_module(crate_id.as_def_id()) | |
855 | }, | |
856 | ) | |
857 | } | |
858 | .map(|module| { | |
859 | let used = self.process_macro_use_imports(item, module); | |
860 | let binding = | |
861 | (module, ty::Visibility::Public, sp, expansion).to_name_binding(self.r.arenas); | |
862 | (used, Some(ModuleOrUniformRoot::Module(module)), binding) | |
863 | }) | |
864 | .unwrap_or((true, None, self.r.dummy_binding)); | |
865 | let import = self.r.arenas.alloc_import(Import { | |
866 | kind: ImportKind::ExternCrate { source: orig_name, target: ident }, | |
867 | root_id: item.id, | |
868 | id: item.id, | |
869 | parent_scope: self.parent_scope, | |
870 | imported_module: Cell::new(module), | |
871 | has_attributes: !item.attrs.is_empty(), | |
872 | use_span_with_attributes: item.span_with_attributes(), | |
873 | use_span: item.span, | |
874 | root_span: item.span, | |
875 | span: item.span, | |
876 | module_path: Vec::new(), | |
877 | vis: Cell::new(vis), | |
878 | used: Cell::new(used), | |
879 | }); | |
880 | self.r.potentially_unused_imports.push(import); | |
881 | let imported_binding = self.r.import(binding, import); | |
882 | if ptr::eq(parent, self.r.graph_root) { | |
883 | if let Some(entry) = self.r.extern_prelude.get(&ident.normalize_to_macros_2_0()) { | |
884 | if expansion != LocalExpnId::ROOT | |
885 | && orig_name.is_some() | |
886 | && entry.extern_crate_item.is_none() | |
887 | { | |
888 | let msg = "macro-expanded `extern crate` items cannot \ | |
889 | shadow names passed with `--extern`"; | |
890 | self.r.session.span_err(item.span, msg); | |
891 | } | |
892 | } | |
893 | let entry = self.r.extern_prelude.entry(ident.normalize_to_macros_2_0()).or_insert( | |
894 | ExternPreludeEntry { extern_crate_item: None, introduced_by_item: true }, | |
895 | ); | |
896 | entry.extern_crate_item = Some(imported_binding); | |
897 | if orig_name.is_some() { | |
898 | entry.introduced_by_item = true; | |
899 | } | |
900 | } | |
901 | self.r.define(parent, ident, TypeNS, imported_binding); | |
902 | } | |
903 | ||
1a4d82fc | 904 | /// Constructs the reduced graph for one foreign item. |
416331ca | 905 | fn build_reduced_graph_for_foreign_item(&mut self, item: &ForeignItem) { |
29967ef6 XL |
906 | let local_def_id = self.r.local_def_id(item.id); |
907 | let def_id = local_def_id.to_def_id(); | |
908 | let (def_kind, ns) = match item.kind { | |
909 | ForeignItemKind::Fn(..) => (DefKind::Fn, ValueNS), | |
ee023bcb | 910 | ForeignItemKind::Static(_, mt, _) => (DefKind::Static(mt), ValueNS), |
29967ef6 | 911 | ForeignItemKind::TyAlias(..) => (DefKind::ForeignTy, TypeNS), |
ba9703b0 | 912 | ForeignItemKind::MacCall(_) => unreachable!(), |
c34b1796 | 913 | }; |
416331ca XL |
914 | let parent = self.parent_scope.module; |
915 | let expansion = self.parent_scope.expansion; | |
476ff2be | 916 | let vis = self.resolve_visibility(&item.vis); |
29967ef6 | 917 | let res = Res::Def(def_kind, def_id); |
416331ca | 918 | self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion)); |
29967ef6 | 919 | self.r.visibilities.insert(local_def_id, vis); |
1a4d82fc JJ |
920 | } |
921 | ||
416331ca XL |
922 | fn build_reduced_graph_for_block(&mut self, block: &Block) { |
923 | let parent = self.parent_scope.module; | |
924 | let expansion = self.parent_scope.expansion; | |
1a4d82fc | 925 | if self.block_needs_anonymous_module(block) { |
dfeec247 | 926 | let module = self.r.new_module( |
c295e0f8 | 927 | Some(parent), |
dfeec247 | 928 | ModuleKind::Block(block.id), |
136023e0 | 929 | expansion.to_expn_id(), |
dfeec247 | 930 | block.span, |
c295e0f8 | 931 | parent.no_implicit_prelude, |
dfeec247 | 932 | ); |
416331ca XL |
933 | self.r.block_map.insert(block.id, module); |
934 | self.parent_scope.module = module; // Descend into the block. | |
1a4d82fc JJ |
935 | } |
936 | } | |
937 | ||
54a0048b | 938 | /// Builds the reduced graph for a single item in an external crate. |
5099ac24 | 939 | fn build_reduced_graph_for_external_crate_res(&mut self, child: ModChild) { |
e1599b0c | 940 | let parent = self.parent_scope.module; |
ee023bcb | 941 | let ModChild { ident, res, vis, span, macro_rules } = child; |
c295e0f8 | 942 | let res = res.expect_non_local(); |
3dfed10e | 943 | let expansion = self.parent_scope.expansion; |
e1599b0c | 944 | // Record primary definitions. |
48663c56 | 945 | match res { |
c295e0f8 XL |
946 | Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, def_id) => { |
947 | let module = self.r.expect_module(def_id); | |
e74abb32 | 948 | self.r.define(parent, ident, TypeNS, (module, vis, span, expansion)); |
c30ab7b3 | 949 | } |
ba9703b0 XL |
950 | Res::Def( |
951 | DefKind::Struct | |
952 | | DefKind::Union | |
953 | | DefKind::Variant | |
954 | | DefKind::TyAlias | |
955 | | DefKind::ForeignTy | |
956 | | DefKind::OpaqueTy | |
957 | | DefKind::TraitAlias | |
f035d41b | 958 | | DefKind::AssocTy, |
ba9703b0 XL |
959 | _, |
960 | ) | |
48663c56 | 961 | | Res::PrimTy(..) |
dfeec247 | 962 | | Res::ToolMod => self.r.define(parent, ident, TypeNS, (res, vis, span, expansion)), |
ba9703b0 XL |
963 | Res::Def( |
964 | DefKind::Fn | |
965 | | DefKind::AssocFn | |
ee023bcb | 966 | | DefKind::Static(_) |
ba9703b0 XL |
967 | | DefKind::Const |
968 | | DefKind::AssocConst | |
969 | | DefKind::Ctor(..), | |
970 | _, | |
971 | ) => self.r.define(parent, ident, ValueNS, (res, vis, span, expansion)), | |
dfeec247 | 972 | Res::Def(DefKind::Macro(..), _) | Res::NonMacroAttr(..) => { |
ee023bcb FG |
973 | if !macro_rules { |
974 | self.r.define(parent, ident, MacroNS, (res, vis, span, expansion)) | |
975 | } | |
dfeec247 | 976 | } |
f9f354fc XL |
977 | Res::Def( |
978 | DefKind::TyParam | |
979 | | DefKind::ConstParam | |
980 | | DefKind::ExternCrate | |
981 | | DefKind::Use | |
982 | | DefKind::ForeignMod | |
983 | | DefKind::AnonConst | |
3c0e092e | 984 | | DefKind::InlineConst |
f9f354fc XL |
985 | | DefKind::Field |
986 | | DefKind::LifetimeParam | |
987 | | DefKind::GlobalAsm | |
988 | | DefKind::Closure | |
989 | | DefKind::Impl | |
990 | | DefKind::Generator, | |
991 | _, | |
992 | ) | |
dfeec247 | 993 | | Res::Local(..) |
5099ac24 | 994 | | Res::SelfTy { .. } |
dfeec247 XL |
995 | | Res::SelfCtor(..) |
996 | | Res::Err => bug!("unexpected resolution: {:?}", res), | |
e1599b0c XL |
997 | } |
998 | // Record some extra data for better diagnostics. | |
e74abb32 | 999 | let cstore = self.r.cstore(); |
e1599b0c | 1000 | match res { |
17df50a5 | 1001 | Res::Def(DefKind::Struct, def_id) => { |
5099ac24 FG |
1002 | let field_names = |
1003 | cstore.struct_field_names_untracked(def_id, self.r.session).collect(); | |
17df50a5 XL |
1004 | let ctor = cstore.ctor_def_id_and_kind_untracked(def_id); |
1005 | if let Some((ctor_def_id, ctor_kind)) = ctor { | |
1006 | let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id); | |
1007 | let ctor_vis = cstore.visibility_untracked(ctor_def_id); | |
5099ac24 FG |
1008 | let field_visibilities = |
1009 | cstore.struct_field_visibilities_untracked(def_id).collect(); | |
17df50a5 XL |
1010 | self.r |
1011 | .struct_constructors | |
1012 | .insert(def_id, (ctor_res, ctor_vis, field_visibilities)); | |
1013 | } | |
1014 | self.insert_field_names(def_id, field_names); | |
1015 | } | |
1016 | Res::Def(DefKind::Union, def_id) => { | |
5099ac24 FG |
1017 | let field_names = |
1018 | cstore.struct_field_names_untracked(def_id, self.r.session).collect(); | |
c30ab7b3 | 1019 | self.insert_field_names(def_id, field_names); |
9e0c209e | 1020 | } |
ba9703b0 | 1021 | Res::Def(DefKind::AssocFn, def_id) => { |
a2a8927a | 1022 | if cstore.fn_has_self_parameter_untracked(def_id) { |
e1599b0c XL |
1023 | self.r.has_self.insert(def_id); |
1024 | } | |
1025 | } | |
e1599b0c | 1026 | _ => {} |
1a4d82fc JJ |
1027 | } |
1028 | } | |
1029 | ||
ba9703b0 | 1030 | fn add_macro_use_binding( |
dfeec247 | 1031 | &mut self, |
f9f354fc | 1032 | name: Symbol, |
dfeec247 XL |
1033 | binding: &'a NameBinding<'a>, |
1034 | span: Span, | |
1035 | allow_shadowing: bool, | |
1036 | ) { | |
416331ca | 1037 | if self.r.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing { |
476ff2be SL |
1038 | let msg = format!("`{}` is already in scope", name); |
1039 | let note = | |
1040 | "macro-expanded `#[macro_use]`s may not shadow existing macros (see RFC 1560)"; | |
416331ca | 1041 | self.r.session.struct_span_err(span, &msg).note(note).emit(); |
476ff2be SL |
1042 | } |
1043 | } | |
c30ab7b3 | 1044 | |
9fa01778 | 1045 | /// Returns `true` if we should consider the underlying `extern crate` to be used. |
ba9703b0 | 1046 | fn process_macro_use_imports(&mut self, item: &Item, module: Module<'a>) -> bool { |
0bf4aa26 XL |
1047 | let mut import_all = None; |
1048 | let mut single_imports = Vec::new(); | |
1049 | for attr in &item.attrs { | |
94222f64 | 1050 | if attr.has_name(sym::macro_use) { |
416331ca | 1051 | if self.parent_scope.module.parent.is_some() { |
dfeec247 XL |
1052 | struct_span_err!( |
1053 | self.r.session, | |
1054 | item.span, | |
1055 | E0468, | |
1056 | "an `extern crate` loading macros must be at the crate root" | |
1057 | ) | |
1058 | .emit(); | |
0bf4aa26 | 1059 | } |
e74abb32 | 1060 | if let ItemKind::ExternCrate(Some(orig_name)) = item.kind { |
dc9dc135 | 1061 | if orig_name == kw::SelfLower { |
dfeec247 XL |
1062 | self.r |
1063 | .session | |
1064 | .struct_span_err( | |
1065 | attr.span, | |
1066 | "`#[macro_use]` is not supported on `extern crate self`", | |
1067 | ) | |
1068 | .emit(); | |
a1dfa0c6 XL |
1069 | } |
1070 | } | |
ee023bcb FG |
1071 | let ill_formed = |span| { |
1072 | struct_span_err!(self.r.session, span, E0466, "bad macro import").emit(); | |
1073 | }; | |
0bf4aa26 | 1074 | match attr.meta() { |
e74abb32 | 1075 | Some(meta) => match meta.kind { |
0bf4aa26 XL |
1076 | MetaItemKind::Word => { |
1077 | import_all = Some(meta.span); | |
1078 | break; | |
1079 | } | |
dfeec247 XL |
1080 | MetaItemKind::List(nested_metas) => { |
1081 | for nested_meta in nested_metas { | |
1082 | match nested_meta.ident() { | |
1083 | Some(ident) if nested_meta.is_word() => { | |
1084 | single_imports.push(ident) | |
1085 | } | |
1086 | _ => ill_formed(nested_meta.span()), | |
1087 | } | |
0bf4aa26 XL |
1088 | } |
1089 | } | |
1090 | MetaItemKind::NameValue(..) => ill_formed(meta.span), | |
dfeec247 | 1091 | }, |
532ac7d7 | 1092 | None => ill_formed(attr.span), |
0bf4aa26 XL |
1093 | } |
1094 | } | |
476ff2be | 1095 | } |
c30ab7b3 | 1096 | |
74b04a01 XL |
1097 | let macro_use_import = |this: &Self, span| { |
1098 | this.r.arenas.alloc_import(Import { | |
1099 | kind: ImportKind::MacroUse, | |
dfeec247 XL |
1100 | root_id: item.id, |
1101 | id: item.id, | |
1102 | parent_scope: this.parent_scope, | |
1103 | imported_module: Cell::new(Some(ModuleOrUniformRoot::Module(module))), | |
dfeec247 XL |
1104 | use_span_with_attributes: item.span_with_attributes(), |
1105 | has_attributes: !item.attrs.is_empty(), | |
1106 | use_span: item.span, | |
1107 | root_span: span, | |
1108 | span, | |
1109 | module_path: Vec::new(), | |
1110 | vis: Cell::new(ty::Visibility::Restricted(DefId::local(CRATE_DEF_INDEX))), | |
1111 | used: Cell::new(false), | |
1112 | }) | |
1113 | }; | |
32a655c1 | 1114 | |
136023e0 | 1115 | let allow_shadowing = self.parent_scope.expansion == LocalExpnId::ROOT; |
0bf4aa26 | 1116 | if let Some(span) = import_all { |
74b04a01 XL |
1117 | let import = macro_use_import(self, span); |
1118 | self.r.potentially_unused_imports.push(import); | |
dfeec247 XL |
1119 | module.for_each_child(self, |this, ident, ns, binding| { |
1120 | if ns == MacroNS { | |
74b04a01 | 1121 | let imported_binding = this.r.import(binding, import); |
ba9703b0 | 1122 | this.add_macro_use_binding(ident.name, imported_binding, span, allow_shadowing); |
dfeec247 | 1123 | } |
476ff2be SL |
1124 | }); |
1125 | } else { | |
9fa01778 | 1126 | for ident in single_imports.iter().cloned() { |
416331ca | 1127 | let result = self.r.resolve_ident_in_module( |
b7449926 XL |
1128 | ModuleOrUniformRoot::Module(module), |
1129 | ident, | |
1130 | MacroNS, | |
416331ca | 1131 | &self.parent_scope, |
ee023bcb | 1132 | None, |
b7449926 | 1133 | ); |
476ff2be | 1134 | if let Ok(binding) = result { |
74b04a01 XL |
1135 | let import = macro_use_import(self, ident.span); |
1136 | self.r.potentially_unused_imports.push(import); | |
1137 | let imported_binding = self.r.import(binding, import); | |
ba9703b0 | 1138 | self.add_macro_use_binding( |
dfeec247 XL |
1139 | ident.name, |
1140 | imported_binding, | |
1141 | ident.span, | |
1142 | allow_shadowing, | |
1143 | ); | |
c30ab7b3 | 1144 | } else { |
dfeec247 XL |
1145 | struct_span_err!(self.r.session, ident.span, E0469, "imported macro not found") |
1146 | .emit(); | |
c30ab7b3 SL |
1147 | } |
1148 | } | |
476ff2be | 1149 | } |
0bf4aa26 | 1150 | import_all.is_some() || !single_imports.is_empty() |
c30ab7b3 SL |
1151 | } |
1152 | ||
9fa01778 | 1153 | /// Returns `true` if this attribute list contains `macro_use`. |
c30ab7b3 SL |
1154 | fn contains_macro_use(&mut self, attrs: &[ast::Attribute]) -> bool { |
1155 | for attr in attrs { | |
94222f64 | 1156 | if attr.has_name(sym::macro_escape) { |
dfeec247 | 1157 | let msg = "`#[macro_escape]` is a deprecated synonym for `#[macro_use]`"; |
416331ca | 1158 | let mut err = self.r.session.struct_span_warn(attr.span, msg); |
476ff2be | 1159 | if let ast::AttrStyle::Inner = attr.style { |
dfeec247 | 1160 | err.help("try an outer attribute: `#[macro_use]`").emit(); |
c30ab7b3 SL |
1161 | } else { |
1162 | err.emit(); | |
1163 | } | |
94222f64 | 1164 | } else if !attr.has_name(sym::macro_use) { |
c30ab7b3 SL |
1165 | continue; |
1166 | } | |
1167 | ||
1168 | if !attr.is_word() { | |
dfeec247 | 1169 | self.r.session.span_err(attr.span, "arguments to `macro_use` are not allowed here"); |
c30ab7b3 SL |
1170 | } |
1171 | return true; | |
1172 | } | |
1173 | ||
1174 | false | |
1175 | } | |
1a4d82fc | 1176 | |
136023e0 | 1177 | fn visit_invoc(&mut self, id: NodeId) -> LocalExpnId { |
416331ca | 1178 | let invoc_id = id.placeholder_to_expn_id(); |
e1599b0c XL |
1179 | let old_parent_scope = self.r.invocation_parent_scopes.insert(invoc_id, self.parent_scope); |
1180 | assert!(old_parent_scope.is_none(), "invocation data is reset for an invocation"); | |
fc512014 XL |
1181 | invoc_id |
1182 | } | |
416331ca | 1183 | |
fc512014 XL |
1184 | /// Visit invocation in context in which it can emit a named item (possibly `macro_rules`) |
1185 | /// directly into its parent scope's module. | |
1186 | fn visit_invoc_in_module(&mut self, id: NodeId) -> MacroRulesScopeRef<'a> { | |
1187 | let invoc_id = self.visit_invoc(id); | |
1188 | self.parent_scope.module.unexpanded_invocations.borrow_mut().insert(invoc_id); | |
1189 | self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Invocation(invoc_id)) | |
416331ca XL |
1190 | } |
1191 | ||
3dfed10e XL |
1192 | fn proc_macro_stub(&self, item: &ast::Item) -> Option<(MacroKind, Ident, Span)> { |
1193 | if self.r.session.contains_name(&item.attrs, sym::proc_macro) { | |
416331ca | 1194 | return Some((MacroKind::Bang, item.ident, item.span)); |
3dfed10e | 1195 | } else if self.r.session.contains_name(&item.attrs, sym::proc_macro_attribute) { |
416331ca | 1196 | return Some((MacroKind::Attr, item.ident, item.span)); |
3dfed10e XL |
1197 | } else if let Some(attr) = self.r.session.find_by_name(&item.attrs, sym::proc_macro_derive) |
1198 | { | |
416331ca XL |
1199 | if let Some(nested_meta) = attr.meta_item_list().and_then(|list| list.get(0).cloned()) { |
1200 | if let Some(ident) = nested_meta.ident() { | |
1201 | return Some((MacroKind::Derive, ident, ident.span)); | |
1202 | } | |
1203 | } | |
1204 | } | |
1205 | None | |
1206 | } | |
1207 | ||
e74abb32 XL |
1208 | // Mark the given macro as unused unless its name starts with `_`. |
1209 | // Macro uses will remove items from this set, and the remaining | |
1210 | // items will be reported as `unused_macros`. | |
3c0e092e | 1211 | fn insert_unused_macro(&mut self, ident: Ident, def_id: LocalDefId, node_id: NodeId) { |
74b04a01 | 1212 | if !ident.as_str().starts_with('_') { |
3c0e092e | 1213 | self.r.unused_macros.insert(def_id, (node_id, ident)); |
e74abb32 XL |
1214 | } |
1215 | } | |
1216 | ||
29967ef6 | 1217 | fn define_macro(&mut self, item: &ast::Item) -> MacroRulesScopeRef<'a> { |
e74abb32 | 1218 | let parent_scope = self.parent_scope; |
416331ca | 1219 | let expansion = parent_scope.expansion; |
f035d41b | 1220 | let def_id = self.r.local_def_id(item.id); |
ba9703b0 | 1221 | let (ext, ident, span, macro_rules) = match &item.kind { |
416331ca | 1222 | ItemKind::MacroDef(def) => { |
e1599b0c | 1223 | let ext = Lrc::new(self.r.compile_macro(item, self.r.session.edition())); |
ba9703b0 | 1224 | (ext, item.ident, item.span, def.macro_rules) |
416331ca | 1225 | } |
3dfed10e | 1226 | ItemKind::Fn(..) => match self.proc_macro_stub(item) { |
416331ca | 1227 | Some((macro_kind, ident, span)) => { |
f9f354fc | 1228 | self.r.proc_macro_stubs.insert(def_id); |
416331ca XL |
1229 | (self.r.dummy_ext(macro_kind), ident, span, false) |
1230 | } | |
ba9703b0 | 1231 | None => return parent_scope.macro_rules, |
dfeec247 | 1232 | }, |
416331ca XL |
1233 | _ => unreachable!(), |
1234 | }; | |
1235 | ||
f9f354fc XL |
1236 | let res = Res::Def(DefKind::Macro(ext.macro_kind()), def_id.to_def_id()); |
1237 | self.r.macro_map.insert(def_id.to_def_id(), ext); | |
1238 | self.r.local_macro_def_scopes.insert(def_id, parent_scope.module); | |
416331ca | 1239 | |
cdc7bbd5 | 1240 | if macro_rules { |
ba9703b0 | 1241 | let ident = ident.normalize_to_macros_2_0(); |
416331ca | 1242 | self.r.macro_names.insert(ident); |
cdc7bbd5 | 1243 | let is_macro_export = self.r.session.contains_name(&item.attrs, sym::macro_export); |
416331ca XL |
1244 | let vis = if is_macro_export { |
1245 | ty::Visibility::Public | |
1246 | } else { | |
1247 | ty::Visibility::Restricted(DefId::local(CRATE_DEF_INDEX)) | |
1248 | }; | |
1249 | let binding = (res, vis, span, expansion).to_name_binding(self.r.arenas); | |
1250 | self.r.set_binding_parent_module(binding, parent_scope.module); | |
1251 | self.r.all_macros.insert(ident.name, res); | |
1252 | if is_macro_export { | |
1253 | let module = self.r.graph_root; | |
dfeec247 | 1254 | self.r.define(module, ident, MacroNS, (res, vis, span, expansion, IsMacroExport)); |
416331ca XL |
1255 | } else { |
1256 | self.r.check_reserved_macro_name(ident, res); | |
3c0e092e | 1257 | self.insert_unused_macro(ident, def_id, item.id); |
416331ca | 1258 | } |
29967ef6 XL |
1259 | self.r.visibilities.insert(def_id, vis); |
1260 | self.r.arenas.alloc_macro_rules_scope(MacroRulesScope::Binding( | |
1261 | self.r.arenas.alloc_macro_rules_binding(MacroRulesBinding { | |
1262 | parent_macro_rules_scope: parent_scope.macro_rules, | |
1263 | binding, | |
1264 | ident, | |
1265 | }), | |
1266 | )) | |
416331ca XL |
1267 | } else { |
1268 | let module = parent_scope.module; | |
ba9703b0 XL |
1269 | let vis = match item.kind { |
1270 | // Visibilities must not be resolved non-speculatively twice | |
1271 | // and we already resolved this one as a `fn` item visibility. | |
ee023bcb FG |
1272 | ItemKind::Fn(..) => { |
1273 | self.try_resolve_visibility(&item.vis, false).unwrap_or(ty::Visibility::Public) | |
1274 | } | |
ba9703b0 XL |
1275 | _ => self.resolve_visibility(&item.vis), |
1276 | }; | |
416331ca | 1277 | if vis != ty::Visibility::Public { |
3c0e092e | 1278 | self.insert_unused_macro(ident, def_id, item.id); |
416331ca XL |
1279 | } |
1280 | self.r.define(module, ident, MacroNS, (res, vis, span, expansion)); | |
29967ef6 | 1281 | self.r.visibilities.insert(def_id, vis); |
ba9703b0 | 1282 | self.parent_scope.macro_rules |
416331ca | 1283 | } |
c30ab7b3 SL |
1284 | } |
1285 | } | |
1286 | ||
1287 | macro_rules! method { | |
1288 | ($visit:ident: $ty:ty, $invoc:path, $walk:ident) => { | |
416331ca | 1289 | fn $visit(&mut self, node: &'b $ty) { |
e74abb32 | 1290 | if let $invoc(..) = node.kind { |
c30ab7b3 SL |
1291 | self.visit_invoc(node.id); |
1292 | } else { | |
1293 | visit::$walk(self, node); | |
1294 | } | |
1295 | } | |
ba9703b0 | 1296 | }; |
1a4d82fc JJ |
1297 | } |
1298 | ||
416331ca | 1299 | impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> { |
ba9703b0 XL |
1300 | method!(visit_expr: ast::Expr, ast::ExprKind::MacCall, walk_expr); |
1301 | method!(visit_pat: ast::Pat, ast::PatKind::MacCall, walk_pat); | |
1302 | method!(visit_ty: ast::Ty, ast::TyKind::MacCall, walk_ty); | |
c30ab7b3 | 1303 | |
416331ca | 1304 | fn visit_item(&mut self, item: &'b Item) { |
5869c6ff XL |
1305 | let orig_module_scope = self.parent_scope.module; |
1306 | self.parent_scope.macro_rules = match item.kind { | |
8bb4bdeb | 1307 | ItemKind::MacroDef(..) => { |
5869c6ff XL |
1308 | let macro_rules_scope = self.define_macro(item); |
1309 | visit::walk_item(self, item); | |
1310 | macro_rules_scope | |
8bb4bdeb | 1311 | } |
ba9703b0 | 1312 | ItemKind::MacCall(..) => { |
5869c6ff XL |
1313 | let macro_rules_scope = self.visit_invoc_in_module(item.id); |
1314 | visit::walk_item(self, item); | |
1315 | macro_rules_scope | |
1316 | } | |
1317 | _ => { | |
1318 | let orig_macro_rules_scope = self.parent_scope.macro_rules; | |
1319 | self.build_reduced_graph_for_item(item); | |
1320 | visit::walk_item(self, item); | |
1321 | match item.kind { | |
1322 | ItemKind::Mod(..) if self.contains_macro_use(&item.attrs) => { | |
1323 | self.parent_scope.macro_rules | |
1324 | } | |
1325 | _ => orig_macro_rules_scope, | |
1326 | } | |
c30ab7b3 | 1327 | } |
c30ab7b3 | 1328 | }; |
5869c6ff | 1329 | self.parent_scope.module = orig_module_scope; |
c30ab7b3 SL |
1330 | } |
1331 | ||
416331ca | 1332 | fn visit_stmt(&mut self, stmt: &'b ast::Stmt) { |
ba9703b0 | 1333 | if let ast::StmtKind::MacCall(..) = stmt.kind { |
fc512014 | 1334 | self.parent_scope.macro_rules = self.visit_invoc_in_module(stmt.id); |
c30ab7b3 SL |
1335 | } else { |
1336 | visit::walk_stmt(self, stmt); | |
1337 | } | |
1a4d82fc JJ |
1338 | } |
1339 | ||
416331ca | 1340 | fn visit_foreign_item(&mut self, foreign_item: &'b ForeignItem) { |
ba9703b0 | 1341 | if let ForeignItemKind::MacCall(_) = foreign_item.kind { |
fc512014 | 1342 | self.visit_invoc_in_module(foreign_item.id); |
83c7162d XL |
1343 | return; |
1344 | } | |
1345 | ||
416331ca | 1346 | self.build_reduced_graph_for_foreign_item(foreign_item); |
c30ab7b3 | 1347 | visit::walk_foreign_item(self, foreign_item); |
1a4d82fc JJ |
1348 | } |
1349 | ||
416331ca XL |
1350 | fn visit_block(&mut self, block: &'b Block) { |
1351 | let orig_current_module = self.parent_scope.module; | |
ba9703b0 | 1352 | let orig_current_macro_rules_scope = self.parent_scope.macro_rules; |
416331ca | 1353 | self.build_reduced_graph_for_block(block); |
a7813a04 | 1354 | visit::walk_block(self, block); |
416331ca | 1355 | self.parent_scope.module = orig_current_module; |
ba9703b0 | 1356 | self.parent_scope.macro_rules = orig_current_macro_rules_scope; |
9e0c209e SL |
1357 | } |
1358 | ||
74b04a01 | 1359 | fn visit_assoc_item(&mut self, item: &'b AssocItem, ctxt: AssocCtxt) { |
ba9703b0 | 1360 | if let AssocItemKind::MacCall(_) = item.kind { |
fc512014 XL |
1361 | match ctxt { |
1362 | AssocCtxt::Trait => { | |
1363 | self.visit_invoc_in_module(item.id); | |
1364 | } | |
1365 | AssocCtxt::Impl => { | |
1366 | self.visit_invoc(item.id); | |
1367 | } | |
1368 | } | |
dfeec247 | 1369 | return; |
c30ab7b3 SL |
1370 | } |
1371 | ||
6a06907d | 1372 | let vis = self.resolve_visibility(&item.vis); |
29967ef6 XL |
1373 | let local_def_id = self.r.local_def_id(item.id); |
1374 | let def_id = local_def_id.to_def_id(); | |
74b04a01 | 1375 | |
6a06907d XL |
1376 | if !(ctxt == AssocCtxt::Impl |
1377 | && matches!(item.vis.kind, ast::VisibilityKind::Inherited) | |
1378 | && self | |
1379 | .r | |
1380 | .trait_impl_items | |
1381 | .contains(&ty::DefIdTree::parent(&*self.r, def_id).unwrap().expect_local())) | |
1382 | { | |
1383 | // Trait impl item visibility is inherited from its trait when not specified | |
1384 | // explicitly. In that case we cannot determine it here in early resolve, | |
1385 | // so we leave a hole in the visibility table to be filled later. | |
1386 | self.r.visibilities.insert(local_def_id, vis); | |
1387 | } | |
1388 | ||
1389 | if ctxt == AssocCtxt::Trait { | |
1390 | let (def_kind, ns) = match item.kind { | |
1391 | AssocItemKind::Const(..) => (DefKind::AssocConst, ValueNS), | |
3c0e092e | 1392 | AssocItemKind::Fn(box Fn { ref sig, .. }) => { |
6a06907d XL |
1393 | if sig.decl.has_self() { |
1394 | self.r.has_self.insert(def_id); | |
29967ef6 | 1395 | } |
6a06907d | 1396 | (DefKind::AssocFn, ValueNS) |
7cac9316 | 1397 | } |
6a06907d XL |
1398 | AssocItemKind::TyAlias(..) => (DefKind::AssocTy, TypeNS), |
1399 | AssocItemKind::MacCall(_) => bug!(), // handled above | |
1400 | }; | |
9e0c209e | 1401 | |
6a06907d XL |
1402 | let parent = self.parent_scope.module; |
1403 | let expansion = self.parent_scope.expansion; | |
1404 | let res = Res::Def(def_kind, def_id); | |
1405 | self.r.define(parent, item.ident, ns, (res, vis, item.span, expansion)); | |
29967ef6 | 1406 | } |
9e0c209e | 1407 | |
74b04a01 | 1408 | visit::walk_assoc_item(self, item, ctxt); |
e74abb32 XL |
1409 | } |
1410 | ||
416331ca | 1411 | fn visit_attribute(&mut self, attr: &'b ast::Attribute) { |
60c5eb7d | 1412 | if !attr.is_doc_comment() && attr::is_builtin_attr(attr) { |
dfeec247 XL |
1413 | self.r |
1414 | .builtin_attrs | |
1415 | .push((attr.get_normal_item().path.segments[0].ident, self.parent_scope)); | |
b7449926 XL |
1416 | } |
1417 | visit::walk_attribute(self, attr); | |
1418 | } | |
e1599b0c XL |
1419 | |
1420 | fn visit_arm(&mut self, arm: &'b ast::Arm) { | |
1421 | if arm.is_placeholder { | |
1422 | self.visit_invoc(arm.id); | |
1423 | } else { | |
1424 | visit::walk_arm(self, arm); | |
1425 | } | |
1426 | } | |
1427 | ||
6a06907d | 1428 | fn visit_expr_field(&mut self, f: &'b ast::ExprField) { |
e1599b0c XL |
1429 | if f.is_placeholder { |
1430 | self.visit_invoc(f.id); | |
1431 | } else { | |
6a06907d | 1432 | visit::walk_expr_field(self, f); |
e1599b0c XL |
1433 | } |
1434 | } | |
1435 | ||
6a06907d | 1436 | fn visit_pat_field(&mut self, fp: &'b ast::PatField) { |
e1599b0c XL |
1437 | if fp.is_placeholder { |
1438 | self.visit_invoc(fp.id); | |
1439 | } else { | |
6a06907d | 1440 | visit::walk_pat_field(self, fp); |
e1599b0c XL |
1441 | } |
1442 | } | |
1443 | ||
1444 | fn visit_generic_param(&mut self, param: &'b ast::GenericParam) { | |
1445 | if param.is_placeholder { | |
1446 | self.visit_invoc(param.id); | |
1447 | } else { | |
1448 | visit::walk_generic_param(self, param); | |
1449 | } | |
1450 | } | |
1451 | ||
1452 | fn visit_param(&mut self, p: &'b ast::Param) { | |
1453 | if p.is_placeholder { | |
1454 | self.visit_invoc(p.id); | |
1455 | } else { | |
1456 | visit::walk_param(self, p); | |
1457 | } | |
1458 | } | |
1459 | ||
6a06907d | 1460 | fn visit_field_def(&mut self, sf: &'b ast::FieldDef) { |
e1599b0c XL |
1461 | if sf.is_placeholder { |
1462 | self.visit_invoc(sf.id); | |
1463 | } else { | |
29967ef6 XL |
1464 | let vis = self.resolve_visibility(&sf.vis); |
1465 | self.r.visibilities.insert(self.r.local_def_id(sf.id), vis); | |
6a06907d | 1466 | visit::walk_field_def(self, sf); |
e1599b0c XL |
1467 | } |
1468 | } | |
1469 | ||
1470 | // Constructs the reduced graph for one variant. Variants exist in the | |
1471 | // type and value namespaces. | |
1472 | fn visit_variant(&mut self, variant: &'b ast::Variant) { | |
1473 | if variant.is_placeholder { | |
fc512014 | 1474 | self.visit_invoc_in_module(variant.id); |
e1599b0c XL |
1475 | return; |
1476 | } | |
1477 | ||
1478 | let parent = self.parent_scope.module; | |
e1599b0c XL |
1479 | let expn_id = self.parent_scope.expansion; |
1480 | let ident = variant.ident; | |
1481 | ||
1482 | // Define a name in the type namespace. | |
29967ef6 XL |
1483 | let def_id = self.r.local_def_id(variant.id); |
1484 | let res = Res::Def(DefKind::Variant, def_id.to_def_id()); | |
6a06907d | 1485 | let vis = self.resolve_visibility(&variant.vis); |
e1599b0c | 1486 | self.r.define(parent, ident, TypeNS, (res, vis, variant.span, expn_id)); |
29967ef6 | 1487 | self.r.visibilities.insert(def_id, vis); |
e1599b0c | 1488 | |
29967ef6 XL |
1489 | // If the variant is marked as non_exhaustive then lower the visibility to within the crate. |
1490 | let ctor_vis = if vis == ty::Visibility::Public | |
1491 | && self.r.session.contains_name(&variant.attrs, sym::non_exhaustive) | |
1492 | { | |
1493 | ty::Visibility::Restricted(DefId::local(CRATE_DEF_INDEX)) | |
1494 | } else { | |
1495 | vis | |
1496 | }; | |
e1599b0c XL |
1497 | |
1498 | // Define a constructor name in the value namespace. | |
1499 | // Braced variants, unlike structs, generate unusable names in | |
1500 | // value namespace, they are reserved for possible future use. | |
1501 | // It's ok to use the variant's id as a ctor id since an | |
1502 | // error will be reported on any use of such resolution anyway. | |
1503 | let ctor_node_id = variant.data.ctor_id().unwrap_or(variant.id); | |
29967ef6 | 1504 | let ctor_def_id = self.r.local_def_id(ctor_node_id); |
e1599b0c | 1505 | let ctor_kind = CtorKind::from_ast(&variant.data); |
29967ef6 | 1506 | let ctor_res = Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id.to_def_id()); |
e1599b0c | 1507 | self.r.define(parent, ident, ValueNS, (ctor_res, ctor_vis, variant.span, expn_id)); |
29967ef6 XL |
1508 | if ctor_def_id != def_id { |
1509 | self.r.visibilities.insert(ctor_def_id, ctor_vis); | |
1510 | } | |
3dfed10e | 1511 | // Record field names for error reporting. |
29967ef6 | 1512 | self.insert_field_names_local(ctor_def_id.to_def_id(), &variant.data); |
e1599b0c XL |
1513 | |
1514 | visit::walk_variant(self, variant); | |
1515 | } | |
a2a8927a XL |
1516 | |
1517 | fn visit_crate(&mut self, krate: &'b ast::Crate) { | |
1518 | if krate.is_placeholder { | |
1519 | self.visit_invoc_in_module(krate.id); | |
1520 | } else { | |
1521 | visit::walk_crate(self, krate); | |
1522 | self.contains_macro_use(&krate.attrs); | |
1523 | } | |
1524 | } | |
1a4d82fc | 1525 | } |