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 if field.is_placeholder {
84 self.visit_macro_invoc(field.id);
86 let name = field.ident.map(|ident| ident.name)
87 .or_else(|| index.map(sym::integer))
89 let node_id = NodeId::placeholder_from_expn_id(self.expansion);
90 sym::integer(self.definitions.placeholder_field_index(node_id))
92 let def = self.create_def(field.id, DefPathData::ValueNs(name), field.span);
93 self.with_parent(def, |this| visit::walk_struct_field(this, field));
97 fn visit_macro_invoc(&mut self, id: NodeId) {
98 self.definitions.set_invocation_parent(id.placeholder_to_expn_id(), self.parent_def);
102 impl<'a> visit::Visitor<'a> for DefCollector<'a> {
103 fn visit_item(&mut self, i: &'a Item) {
104 debug!("visit_item: {:?}", i);
106 // Pick the def data. This need not be unique, but the more
107 // information we encapsulate into, the better
108 let def_data = match &i.kind {
109 ItemKind::Impl(..) => DefPathData::Impl,
110 ItemKind::Mod(..) if i.ident.name == kw::Invalid => {
111 return visit::walk_item(self, i);
113 ItemKind::Mod(..) | ItemKind::Trait(..) | ItemKind::TraitAlias(..) |
114 ItemKind::Enum(..) | ItemKind::Struct(..) | ItemKind::Union(..) |
115 ItemKind::ExternCrate(..) | ItemKind::ForeignMod(..) |
116 ItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.name),
117 ItemKind::Fn(sig, generics, body) if sig.header.asyncness.node.is_async() => {
118 return self.visit_async_fn(
128 ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) =>
129 DefPathData::ValueNs(i.ident.name),
130 ItemKind::MacroDef(..) => DefPathData::MacroNs(i.ident.name),
131 ItemKind::Mac(..) => return self.visit_macro_invoc(i.id),
132 ItemKind::GlobalAsm(..) => DefPathData::Misc,
133 ItemKind::Use(..) => {
134 return visit::walk_item(self, i);
137 let def = self.create_def(i.id, def_data, i.span);
139 self.with_parent(def, |this| {
141 ItemKind::Struct(ref struct_def, _) | ItemKind::Union(ref struct_def, _) => {
142 // If this is a unit or tuple-like struct, register the constructor.
143 if let Some(ctor_hir_id) = struct_def.ctor_id() {
144 this.create_def(ctor_hir_id, DefPathData::Ctor, i.span);
149 visit::walk_item(this, i);
153 fn visit_use_tree(&mut self, use_tree: &'a UseTree, id: NodeId, _nested: bool) {
154 self.create_def(id, DefPathData::Misc, use_tree.span);
155 visit::walk_use_tree(self, use_tree, id);
158 fn visit_foreign_item(&mut self, foreign_item: &'a ForeignItem) {
159 if let ForeignItemKind::Macro(_) = foreign_item.kind {
160 return self.visit_macro_invoc(foreign_item.id);
163 let def = self.create_def(foreign_item.id,
164 DefPathData::ValueNs(foreign_item.ident.name),
167 self.with_parent(def, |this| {
168 visit::walk_foreign_item(this, foreign_item);
172 fn visit_variant(&mut self, v: &'a Variant) {
173 if v.is_placeholder {
174 return self.visit_macro_invoc(v.id);
176 let def = self.create_def(v.id,
177 DefPathData::TypeNs(v.ident.name),
179 self.with_parent(def, |this| {
180 if let Some(ctor_hir_id) = v.data.ctor_id() {
181 this.create_def(ctor_hir_id, DefPathData::Ctor, v.span);
183 visit::walk_variant(this, v)
187 fn visit_variant_data(&mut self, data: &'a VariantData) {
188 // The assumption here is that non-`cfg` macro expansion cannot change field indices.
189 // It currently holds because only inert attributes are accepted on fields,
190 // and every such attribute expands into a single field after it's resolved.
191 for (index, field) in data.fields().iter().enumerate() {
192 self.collect_field(field, Some(index));
193 if field.is_placeholder && field.ident.is_none() {
194 self.definitions.set_placeholder_field_index(field.id, index);
199 fn visit_generic_param(&mut self, param: &'a GenericParam) {
200 if param.is_placeholder {
201 self.visit_macro_invoc(param.id);
204 let name = param.ident.name;
205 let def_path_data = match param.kind {
206 GenericParamKind::Lifetime { .. } => DefPathData::LifetimeNs(name),
207 GenericParamKind::Type { .. } => DefPathData::TypeNs(name),
208 GenericParamKind::Const { .. } => DefPathData::ValueNs(name),
210 self.create_def(param.id, def_path_data, param.ident.span);
212 visit::walk_generic_param(self, param);
215 fn visit_trait_item(&mut self, ti: &'a TraitItem) {
216 let def_data = match ti.kind {
217 TraitItemKind::Method(..) | TraitItemKind::Const(..) =>
218 DefPathData::ValueNs(ti.ident.name),
219 TraitItemKind::Type(..) => {
220 DefPathData::TypeNs(ti.ident.name)
222 TraitItemKind::Macro(..) => return self.visit_macro_invoc(ti.id),
225 let def = self.create_def(ti.id, def_data, ti.span);
226 self.with_parent(def, |this| visit::walk_trait_item(this, ti));
229 fn visit_impl_item(&mut self, ii: &'a ImplItem) {
230 let def_data = match ii.kind {
231 ImplItemKind::Method(FnSig {
234 }, ref body) if header.asyncness.node.is_async() => {
235 return self.visit_async_fn(
245 ImplItemKind::Method(..) |
246 ImplItemKind::Const(..) => DefPathData::ValueNs(ii.ident.name),
247 ImplItemKind::TyAlias(..) => DefPathData::TypeNs(ii.ident.name),
248 ImplItemKind::Macro(..) => return self.visit_macro_invoc(ii.id),
251 let def = self.create_def(ii.id, def_data, ii.span);
252 self.with_parent(def, |this| visit::walk_impl_item(this, ii));
255 fn visit_pat(&mut self, pat: &'a Pat) {
257 PatKind::Mac(..) => return self.visit_macro_invoc(pat.id),
258 _ => visit::walk_pat(self, pat),
262 fn visit_anon_const(&mut self, constant: &'a AnonConst) {
263 let def = self.create_def(constant.id,
264 DefPathData::AnonConst,
265 constant.value.span);
266 self.with_parent(def, |this| visit::walk_anon_const(this, constant));
269 fn visit_expr(&mut self, expr: &'a Expr) {
270 let parent_def = match expr.kind {
271 ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id),
272 ExprKind::Closure(_, asyncness, ..) => {
273 // Async closures desugar to closures inside of closures, so
274 // we must create two defs.
275 let closure_def = self.create_def(expr.id, DefPathData::ClosureExpr, expr.span);
277 IsAsync::Async { closure_id, .. } =>
278 self.create_def(closure_id, DefPathData::ClosureExpr, expr.span),
279 IsAsync::NotAsync => closure_def,
282 ExprKind::Async(_, async_id, _) =>
283 self.create_def(async_id, DefPathData::ClosureExpr, expr.span),
284 _ => self.parent_def,
287 self.with_parent(parent_def, |this| visit::walk_expr(this, expr));
290 fn visit_ty(&mut self, ty: &'a Ty) {
292 TyKind::Mac(..) => return self.visit_macro_invoc(ty.id),
293 TyKind::ImplTrait(node_id, _) => {
294 self.create_def(node_id, DefPathData::ImplTrait, ty.span);
298 visit::walk_ty(self, ty);
301 fn visit_stmt(&mut self, stmt: &'a Stmt) {
303 StmtKind::Mac(..) => self.visit_macro_invoc(stmt.id),
304 _ => visit::walk_stmt(self, stmt),
308 fn visit_token(&mut self, t: Token) {
309 if let token::Interpolated(nt) = t.kind {
310 if let token::NtExpr(ref expr) = *nt {
311 if let ExprKind::Mac(..) = expr.kind {
312 self.visit_macro_invoc(expr.id);
318 fn visit_arm(&mut self, arm: &'a Arm) {
319 if arm.is_placeholder {
320 self.visit_macro_invoc(arm.id)
322 visit::walk_arm(self, arm)
326 fn visit_field(&mut self, f: &'a Field) {
327 if f.is_placeholder {
328 self.visit_macro_invoc(f.id)
330 visit::walk_field(self, f)
334 fn visit_field_pattern(&mut self, fp: &'a FieldPat) {
335 if fp.is_placeholder {
336 self.visit_macro_invoc(fp.id)
338 visit::walk_field_pattern(self, fp)
342 fn visit_param(&mut self, p: &'a Param) {
343 if p.is_placeholder {
344 self.visit_macro_invoc(p.id)
346 visit::walk_param(self, p)
350 // This method is called only when we are visiting an individual field
351 // after expanding an attribute on it.
352 fn visit_struct_field(&mut self, field: &'a StructField) {
353 self.collect_field(field, None);