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