2 use rustc::hir::map::definitions::*;
4 use rustc_ast::token::{self, Token};
5 use rustc_ast::visit::{self, FnKind};
6 use rustc_expand::expand::AstFragment;
7 use rustc_hir::def_id::LocalDefId;
8 use rustc_span::hygiene::ExpnId;
9 use rustc_span::symbol::{kw, sym};
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,
24 parent_def: LocalDefId,
28 impl<'a> DefCollector<'a> {
29 fn create_def(&mut self, node_id: NodeId, data: DefPathData, span: Span) -> LocalDefId {
30 let parent_def = self.parent_def;
31 debug!("create_def(node_id={:?}, data={:?}, parent_def={:?})", node_id, data, parent_def);
32 self.definitions.create_def_with_parent(parent_def, node_id, data, self.expansion, span)
35 fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: LocalDefId, f: F) {
36 let orig_parent_def = std::mem::replace(&mut self.parent_def, parent_def);
38 self.parent_def = orig_parent_def;
41 fn collect_field(&mut self, field: &'a StructField, index: Option<usize>) {
42 let index = |this: &Self| {
43 index.unwrap_or_else(|| {
44 let node_id = NodeId::placeholder_from_expn_id(this.expansion);
45 this.definitions.placeholder_field_index(node_id)
49 if field.is_placeholder {
50 self.definitions.set_placeholder_field_index(field.id, index(self));
51 self.visit_macro_invoc(field.id);
53 let name = field.ident.map_or_else(|| sym::integer(index(self)), |ident| ident.name);
54 let def = self.create_def(field.id, DefPathData::ValueNs(name), field.span);
55 self.with_parent(def, |this| visit::walk_struct_field(this, field));
59 fn visit_macro_invoc(&mut self, id: NodeId) {
60 self.definitions.set_invocation_parent(id.placeholder_to_expn_id(), self.parent_def);
64 impl<'a> visit::Visitor<'a> for DefCollector<'a> {
65 fn visit_item(&mut self, i: &'a Item) {
66 debug!("visit_item: {:?}", i);
68 // Pick the def data. This need not be unique, but the more
69 // information we encapsulate into, the better
70 let def_data = match &i.kind {
71 ItemKind::Impl { .. } => DefPathData::Impl,
72 ItemKind::Mod(..) if i.ident.name == kw::Invalid => {
73 return visit::walk_item(self, i);
77 | ItemKind::TraitAlias(..)
79 | ItemKind::Struct(..)
81 | ItemKind::ExternCrate(..)
82 | ItemKind::ForeignMod(..)
83 | ItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.name),
84 ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) => {
85 DefPathData::ValueNs(i.ident.name)
87 ItemKind::MacroDef(..) => DefPathData::MacroNs(i.ident.name),
88 ItemKind::MacCall(..) => return self.visit_macro_invoc(i.id),
89 ItemKind::GlobalAsm(..) => DefPathData::Misc,
90 ItemKind::Use(..) => {
91 return visit::walk_item(self, i);
94 let def = self.create_def(i.id, def_data, i.span);
96 self.with_parent(def, |this| {
98 ItemKind::Struct(ref struct_def, _) | ItemKind::Union(ref struct_def, _) => {
99 // If this is a unit or tuple-like struct, register the constructor.
100 if let Some(ctor_hir_id) = struct_def.ctor_id() {
101 this.create_def(ctor_hir_id, DefPathData::Ctor, i.span);
106 visit::walk_item(this, i);
110 fn visit_fn(&mut self, fn_kind: FnKind<'a>, span: Span, _: NodeId) {
111 if let FnKind::Fn(_, _, sig, _, body) = fn_kind {
112 if let Async::Yes { closure_id, return_impl_trait_id, .. } = sig.header.asyncness {
113 self.create_def(return_impl_trait_id, DefPathData::ImplTrait, span);
115 // For async functions, we need to create their inner defs inside of a
116 // closure to match their desugared representation. Besides that,
117 // we must mirror everything that `visit::walk_fn` below does.
118 self.visit_fn_header(&sig.header);
119 visit::walk_fn_decl(self, &sig.decl);
120 if let Some(body) = body {
121 let closure_def = self.create_def(closure_id, DefPathData::ClosureExpr, span);
122 self.with_parent(closure_def, |this| this.visit_block(body));
128 visit::walk_fn(self, fn_kind, span);
131 fn visit_use_tree(&mut self, use_tree: &'a UseTree, id: NodeId, _nested: bool) {
132 self.create_def(id, DefPathData::Misc, use_tree.span);
133 visit::walk_use_tree(self, use_tree, id);
136 fn visit_foreign_item(&mut self, foreign_item: &'a ForeignItem) {
137 if let ForeignItemKind::MacCall(_) = foreign_item.kind {
138 return self.visit_macro_invoc(foreign_item.id);
141 let def = self.create_def(
143 DefPathData::ValueNs(foreign_item.ident.name),
147 self.with_parent(def, |this| {
148 visit::walk_foreign_item(this, foreign_item);
152 fn visit_variant(&mut self, v: &'a Variant) {
153 if v.is_placeholder {
154 return self.visit_macro_invoc(v.id);
156 let def = self.create_def(v.id, DefPathData::TypeNs(v.ident.name), v.span);
157 self.with_parent(def, |this| {
158 if let Some(ctor_hir_id) = v.data.ctor_id() {
159 this.create_def(ctor_hir_id, DefPathData::Ctor, v.span);
161 visit::walk_variant(this, v)
165 fn visit_variant_data(&mut self, data: &'a VariantData) {
166 // The assumption here is that non-`cfg` macro expansion cannot change field indices.
167 // It currently holds because only inert attributes are accepted on fields,
168 // and every such attribute expands into a single field after it's resolved.
169 for (index, field) in data.fields().iter().enumerate() {
170 self.collect_field(field, Some(index));
174 fn visit_generic_param(&mut self, param: &'a GenericParam) {
175 if param.is_placeholder {
176 self.visit_macro_invoc(param.id);
179 let name = param.ident.name;
180 let def_path_data = match param.kind {
181 GenericParamKind::Lifetime { .. } => DefPathData::LifetimeNs(name),
182 GenericParamKind::Type { .. } => DefPathData::TypeNs(name),
183 GenericParamKind::Const { .. } => DefPathData::ValueNs(name),
185 self.create_def(param.id, def_path_data, param.ident.span);
187 visit::walk_generic_param(self, param);
190 fn visit_assoc_item(&mut self, i: &'a AssocItem, ctxt: visit::AssocCtxt) {
191 let def_data = match &i.kind {
192 AssocItemKind::Fn(..) | AssocItemKind::Const(..) => DefPathData::ValueNs(i.ident.name),
193 AssocItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.name),
194 AssocItemKind::MacCall(..) => return self.visit_macro_invoc(i.id),
197 let def = self.create_def(i.id, def_data, i.span);
198 self.with_parent(def, |this| visit::walk_assoc_item(this, i, ctxt));
201 fn visit_pat(&mut self, pat: &'a Pat) {
203 PatKind::MacCall(..) => return self.visit_macro_invoc(pat.id),
204 _ => visit::walk_pat(self, pat),
208 fn visit_anon_const(&mut self, constant: &'a AnonConst) {
209 let def = self.create_def(constant.id, DefPathData::AnonConst, constant.value.span);
210 self.with_parent(def, |this| visit::walk_anon_const(this, constant));
213 fn visit_expr(&mut self, expr: &'a Expr) {
214 let parent_def = match expr.kind {
215 ExprKind::MacCall(..) => return self.visit_macro_invoc(expr.id),
216 ExprKind::Closure(_, asyncness, ..) => {
217 // Async closures desugar to closures inside of closures, so
218 // we must create two defs.
219 let closure_def = self.create_def(expr.id, DefPathData::ClosureExpr, expr.span);
221 Async::Yes { closure_id, .. } => {
222 self.create_def(closure_id, DefPathData::ClosureExpr, expr.span)
224 Async::No => closure_def,
227 ExprKind::Async(_, async_id, _) => {
228 self.create_def(async_id, DefPathData::ClosureExpr, expr.span)
230 _ => self.parent_def,
233 self.with_parent(parent_def, |this| visit::walk_expr(this, expr));
236 fn visit_ty(&mut self, ty: &'a Ty) {
238 TyKind::MacCall(..) => return self.visit_macro_invoc(ty.id),
239 TyKind::ImplTrait(node_id, _) => {
240 self.create_def(node_id, DefPathData::ImplTrait, ty.span);
244 visit::walk_ty(self, ty);
247 fn visit_stmt(&mut self, stmt: &'a Stmt) {
249 StmtKind::MacCall(..) => self.visit_macro_invoc(stmt.id),
250 _ => visit::walk_stmt(self, stmt),
254 fn visit_token(&mut self, t: Token) {
255 if let token::Interpolated(nt) = t.kind {
256 if let token::NtExpr(ref expr) = *nt {
257 if let ExprKind::MacCall(..) = expr.kind {
258 self.visit_macro_invoc(expr.id);
264 fn visit_arm(&mut self, arm: &'a Arm) {
265 if arm.is_placeholder { self.visit_macro_invoc(arm.id) } else { visit::walk_arm(self, arm) }
268 fn visit_field(&mut self, f: &'a Field) {
269 if f.is_placeholder { self.visit_macro_invoc(f.id) } else { visit::walk_field(self, f) }
272 fn visit_field_pattern(&mut self, fp: &'a FieldPat) {
273 if fp.is_placeholder {
274 self.visit_macro_invoc(fp.id)
276 visit::walk_field_pattern(self, fp)
280 fn visit_param(&mut self, p: &'a Param) {
281 if p.is_placeholder { self.visit_macro_invoc(p.id) } else { visit::walk_param(self, p) }
284 // This method is called only when we are visiting an individual field
285 // after expanding an attribute on it.
286 fn visit_struct_field(&mut self, field: &'a StructField) {
287 self.collect_field(field, None);