2 use rustc::hir::map::definitions::*;
3 use rustc::hir::def_id::DefIndex;
6 use syntax::symbol::{kw, sym};
7 use syntax::token::{self, Token};
8 use syntax_expand::expand::AstFragment;
9 use syntax_pos::hygiene::ExpnId;
12 crate fn collect_definitions(
13 definitions: &mut Definitions,
14 fragment: &AstFragment,
17 let parent_def = definitions.invocation_parent(expansion);
18 fragment.visit_with(&mut DefCollector { definitions, parent_def, expansion });
21 /// Creates `DefId`s for nodes in the AST.
22 struct DefCollector<'a> {
23 definitions: &'a mut Definitions,
28 impl<'a> DefCollector<'a> {
29 fn create_def(&mut self,
34 let parent_def = self.parent_def;
35 debug!("create_def(node_id={:?}, data={:?}, parent_def={:?})", node_id, data, parent_def);
36 self.definitions.create_def_with_parent(parent_def, node_id, data, self.expansion, span)
39 fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: DefIndex, f: F) {
40 let orig_parent_def = std::mem::replace(&mut self.parent_def, parent_def);
42 self.parent_def = orig_parent_def;
51 generics: &'a Generics,
55 let (closure_id, return_impl_trait_id) = match header.asyncness.node {
59 } => (closure_id, return_impl_trait_id),
63 // For async functions, we need to create their inner defs inside of a
64 // closure to match their desugared representation.
65 let fn_def_data = DefPathData::ValueNs(name);
66 let fn_def = self.create_def(id, fn_def_data, span);
67 return self.with_parent(fn_def, |this| {
68 this.create_def(return_impl_trait_id, DefPathData::ImplTrait, span);
70 visit::walk_generics(this, generics);
71 visit::walk_fn_decl(this, decl);
73 let closure_def = this.create_def(
74 closure_id, DefPathData::ClosureExpr, span,
76 this.with_parent(closure_def, |this| {
77 visit::walk_block(this, body);
82 fn collect_field(&mut self, field: &'a StructField, index: Option<usize>) {
83 let index = |this: &Self| index.unwrap_or_else(|| {
84 let node_id = NodeId::placeholder_from_expn_id(this.expansion);
85 this.definitions.placeholder_field_index(node_id)
88 if field.is_placeholder {
89 self.definitions.set_placeholder_field_index(field.id, index(self));
90 self.visit_macro_invoc(field.id);
92 let name = field.ident.map_or_else(|| sym::integer(index(self)), |ident| ident.name);
93 let def = self.create_def(field.id, DefPathData::ValueNs(name), field.span);
94 self.with_parent(def, |this| visit::walk_struct_field(this, field));
98 fn visit_macro_invoc(&mut self, id: NodeId) {
99 self.definitions.set_invocation_parent(id.placeholder_to_expn_id(), self.parent_def);
103 impl<'a> visit::Visitor<'a> for DefCollector<'a> {
104 fn visit_item(&mut self, i: &'a Item) {
105 debug!("visit_item: {:?}", i);
107 // Pick the def data. This need not be unique, but the more
108 // information we encapsulate into, the better
109 let def_data = match &i.kind {
110 ItemKind::Impl(..) => DefPathData::Impl,
111 ItemKind::Mod(..) if i.ident.name == kw::Invalid => {
112 return visit::walk_item(self, i);
114 ItemKind::Mod(..) | ItemKind::Trait(..) | ItemKind::TraitAlias(..) |
115 ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) |
116 ItemKind::ExternCrate(..) | ItemKind::ForeignMod(..) |
117 ItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.name),
118 ItemKind::Fn(sig, generics, body) if sig.header.asyncness.node.is_async() => {
119 return self.visit_async_fn(
129 ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) =>
130 DefPathData::ValueNs(i.ident.name),
131 ItemKind::MacroDef(..) => DefPathData::MacroNs(i.ident.name),
132 ItemKind::Mac(..) => return self.visit_macro_invoc(i.id),
133 ItemKind::GlobalAsm(..) => DefPathData::Misc,
134 ItemKind::Use(..) => {
135 return visit::walk_item(self, i);
138 let def = self.create_def(i.id, def_data, i.span);
140 self.with_parent(def, |this| {
142 ItemKind::Struct(ref struct_def, _) | ItemKind::Union(ref struct_def, _) => {
143 // If this is a unit or tuple-like struct, register the constructor.
144 if let Some(ctor_hir_id) = struct_def.ctor_id() {
145 this.create_def(ctor_hir_id, DefPathData::Ctor, i.span);
150 visit::walk_item(this, i);
154 fn visit_use_tree(&mut self, use_tree: &'a UseTree, id: NodeId, _nested: bool) {
155 self.create_def(id, DefPathData::Misc, use_tree.span);
156 visit::walk_use_tree(self, use_tree, id);
159 fn visit_foreign_item(&mut self, foreign_item: &'a ForeignItem) {
160 if let ForeignItemKind::Macro(_) = foreign_item.kind {
161 return self.visit_macro_invoc(foreign_item.id);
164 let def = self.create_def(foreign_item.id,
165 DefPathData::ValueNs(foreign_item.ident.name),
168 self.with_parent(def, |this| {
169 visit::walk_foreign_item(this, foreign_item);
173 fn visit_variant(&mut self, v: &'a Variant) {
174 if v.is_placeholder {
175 return self.visit_macro_invoc(v.id);
177 let def = self.create_def(v.id,
178 DefPathData::TypeNs(v.ident.name),
180 self.with_parent(def, |this| {
181 if let Some(ctor_hir_id) = v.data.ctor_id() {
182 this.create_def(ctor_hir_id, DefPathData::Ctor, v.span);
184 visit::walk_variant(this, v)
188 fn visit_variant_data(&mut self, data: &'a VariantData) {
189 // The assumption here is that non-`cfg` macro expansion cannot change field indices.
190 // It currently holds because only inert attributes are accepted on fields,
191 // and every such attribute expands into a single field after it's resolved.
192 for (index, field) in data.fields().iter().enumerate() {
193 self.collect_field(field, Some(index));
197 fn visit_generic_param(&mut self, param: &'a GenericParam) {
198 if param.is_placeholder {
199 self.visit_macro_invoc(param.id);
202 let name = param.ident.name;
203 let def_path_data = match param.kind {
204 GenericParamKind::Lifetime { .. } => DefPathData::LifetimeNs(name),
205 GenericParamKind::Type { .. } => DefPathData::TypeNs(name),
206 GenericParamKind::Const { .. } => DefPathData::ValueNs(name),
208 self.create_def(param.id, def_path_data, param.ident.span);
210 visit::walk_generic_param(self, param);
213 fn visit_trait_item(&mut self, ti: &'a TraitItem) {
214 let def_data = match ti.kind {
215 TraitItemKind::Method(..) | TraitItemKind::Const(..) =>
216 DefPathData::ValueNs(ti.ident.name),
217 TraitItemKind::Type(..) => {
218 DefPathData::TypeNs(ti.ident.name)
220 TraitItemKind::Macro(..) => return self.visit_macro_invoc(ti.id),
223 let def = self.create_def(ti.id, def_data, ti.span);
224 self.with_parent(def, |this| visit::walk_trait_item(this, ti));
227 fn visit_impl_item(&mut self, ii: &'a ImplItem) {
228 let def_data = match ii.kind {
229 ImplItemKind::Method(FnSig {
232 }, ref body) if header.asyncness.node.is_async() => {
233 return self.visit_async_fn(
243 ImplItemKind::Method(..) |
244 ImplItemKind::Const(..) => DefPathData::ValueNs(ii.ident.name),
245 ImplItemKind::TyAlias(..) => DefPathData::TypeNs(ii.ident.name),
246 ImplItemKind::Macro(..) => return self.visit_macro_invoc(ii.id),
249 let def = self.create_def(ii.id, def_data, ii.span);
250 self.with_parent(def, |this| visit::walk_impl_item(this, ii));
253 fn visit_pat(&mut self, pat: &'a Pat) {
255 PatKind::Mac(..) => return self.visit_macro_invoc(pat.id),
256 _ => visit::walk_pat(self, pat),
260 fn visit_anon_const(&mut self, constant: &'a AnonConst) {
261 let def = self.create_def(constant.id,
262 DefPathData::AnonConst,
263 constant.value.span);
264 self.with_parent(def, |this| visit::walk_anon_const(this, constant));
267 fn visit_expr(&mut self, expr: &'a Expr) {
268 let parent_def = match expr.kind {
269 ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id),
270 ExprKind::Closure(_, asyncness, ..) => {
271 // Async closures desugar to closures inside of closures, so
272 // we must create two defs.
273 let closure_def = self.create_def(expr.id, DefPathData::ClosureExpr, expr.span);
275 IsAsync::Async { closure_id, .. } =>
276 self.create_def(closure_id, DefPathData::ClosureExpr, expr.span),
277 IsAsync::NotAsync => closure_def,
280 ExprKind::Async(_, async_id, _) =>
281 self.create_def(async_id, DefPathData::ClosureExpr, expr.span),
282 _ => self.parent_def,
285 self.with_parent(parent_def, |this| visit::walk_expr(this, expr));
288 fn visit_ty(&mut self, ty: &'a Ty) {
290 TyKind::Mac(..) => return self.visit_macro_invoc(ty.id),
291 TyKind::ImplTrait(node_id, _) => {
292 self.create_def(node_id, DefPathData::ImplTrait, ty.span);
296 visit::walk_ty(self, ty);
299 fn visit_stmt(&mut self, stmt: &'a Stmt) {
301 StmtKind::Mac(..) => self.visit_macro_invoc(stmt.id),
302 _ => visit::walk_stmt(self, stmt),
306 fn visit_token(&mut self, t: Token) {
307 if let token::Interpolated(nt) = t.kind {
308 if let token::NtExpr(ref expr) = *nt {
309 if let ExprKind::Mac(..) = expr.kind {
310 self.visit_macro_invoc(expr.id);
316 fn visit_arm(&mut self, arm: &'a Arm) {
317 if arm.is_placeholder {
318 self.visit_macro_invoc(arm.id)
320 visit::walk_arm(self, arm)
324 fn visit_field(&mut self, f: &'a Field) {
325 if f.is_placeholder {
326 self.visit_macro_invoc(f.id)
328 visit::walk_field(self, f)
332 fn visit_field_pattern(&mut self, fp: &'a FieldPat) {
333 if fp.is_placeholder {
334 self.visit_macro_invoc(fp.id)
336 visit::walk_field_pattern(self, fp)
340 fn visit_param(&mut self, p: &'a Param) {
341 if p.is_placeholder {
342 self.visit_macro_invoc(p.id)
344 visit::walk_param(self, p)
348 // This method is called only when we are visiting an individual field
349 // after expanding an attribute on it.
350 fn visit_struct_field(&mut self, field: &'a StructField) {
351 self.collect_field(field, None);