| use log::debug; |
| use rustc::hir::def_id::DefIndex; |
| use rustc::hir::map::definitions::*; |
| use rustc_expand::expand::AstFragment; |
| use rustc_span::hygiene::ExpnId; |
| use rustc_span::symbol::{kw, sym}; |
| use rustc_span::Span; |
| use syntax::ast::*; |
| use syntax::token::{self, Token}; |
| use syntax::visit; |
| |
| crate fn collect_definitions( |
| definitions: &mut Definitions, |
| fragment: &AstFragment, |
| expansion: ExpnId, |
| ) { |
| let parent_def = definitions.invocation_parent(expansion); |
| fragment.visit_with(&mut DefCollector { definitions, parent_def, expansion }); |
| } |
| |
| /// Creates `DefId`s for nodes in the AST. |
| struct DefCollector<'a> { |
| definitions: &'a mut Definitions, |
| parent_def: DefIndex, |
| expansion: ExpnId, |
| } |
| |
| impl<'a> DefCollector<'a> { |
| fn create_def(&mut self, node_id: NodeId, data: DefPathData, span: Span) -> DefIndex { |
| let parent_def = self.parent_def; |
| debug!("create_def(node_id={:?}, data={:?}, parent_def={:?})", node_id, data, parent_def); |
| self.definitions.create_def_with_parent(parent_def, node_id, data, self.expansion, span) |
| } |
| |
| fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: DefIndex, f: F) { |
| let orig_parent_def = std::mem::replace(&mut self.parent_def, parent_def); |
| f(self); |
| self.parent_def = orig_parent_def; |
| } |
| |
| fn visit_async_fn( |
| &mut self, |
| id: NodeId, |
| name: Name, |
| span: Span, |
| header: &FnHeader, |
| generics: &'a Generics, |
| decl: &'a FnDecl, |
| body: Option<&'a Block>, |
| ) { |
| let (closure_id, return_impl_trait_id) = match header.asyncness.node { |
| IsAsync::Async { closure_id, return_impl_trait_id } => { |
| (closure_id, return_impl_trait_id) |
| } |
| _ => unreachable!(), |
| }; |
| |
| // For async functions, we need to create their inner defs inside of a |
| // closure to match their desugared representation. |
| let fn_def_data = DefPathData::ValueNs(name); |
| let fn_def = self.create_def(id, fn_def_data, span); |
| return self.with_parent(fn_def, |this| { |
| this.create_def(return_impl_trait_id, DefPathData::ImplTrait, span); |
| |
| visit::walk_generics(this, generics); |
| visit::walk_fn_decl(this, decl); |
| |
| let closure_def = this.create_def(closure_id, DefPathData::ClosureExpr, span); |
| this.with_parent(closure_def, |this| { |
| if let Some(body) = body { |
| visit::walk_block(this, body); |
| } |
| }) |
| }); |
| } |
| |
| fn collect_field(&mut self, field: &'a StructField, index: Option<usize>) { |
| let index = |this: &Self| { |
| index.unwrap_or_else(|| { |
| let node_id = NodeId::placeholder_from_expn_id(this.expansion); |
| this.definitions.placeholder_field_index(node_id) |
| }) |
| }; |
| |
| if field.is_placeholder { |
| self.definitions.set_placeholder_field_index(field.id, index(self)); |
| self.visit_macro_invoc(field.id); |
| } else { |
| let name = field.ident.map_or_else(|| sym::integer(index(self)), |ident| ident.name); |
| let def = self.create_def(field.id, DefPathData::ValueNs(name), field.span); |
| self.with_parent(def, |this| visit::walk_struct_field(this, field)); |
| } |
| } |
| |
| fn visit_macro_invoc(&mut self, id: NodeId) { |
| self.definitions.set_invocation_parent(id.placeholder_to_expn_id(), self.parent_def); |
| } |
| } |
| |
| impl<'a> visit::Visitor<'a> for DefCollector<'a> { |
| fn visit_item(&mut self, i: &'a Item) { |
| debug!("visit_item: {:?}", i); |
| |
| // Pick the def data. This need not be unique, but the more |
| // information we encapsulate into, the better |
| let def_data = match &i.kind { |
| ItemKind::Impl(..) => DefPathData::Impl, |
| ItemKind::Mod(..) if i.ident.name == kw::Invalid => { |
| return visit::walk_item(self, i); |
| } |
| ItemKind::Mod(..) |
| | ItemKind::Trait(..) |
| | ItemKind::TraitAlias(..) |
| | ItemKind::Enum(..) |
| | ItemKind::Struct(..) |
| | ItemKind::Union(..) |
| | ItemKind::ExternCrate(..) |
| | ItemKind::ForeignMod(..) |
| | ItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.name), |
| ItemKind::Fn(sig, generics, body) if sig.header.asyncness.node.is_async() => { |
| return self.visit_async_fn( |
| i.id, |
| i.ident.name, |
| i.span, |
| &sig.header, |
| generics, |
| &sig.decl, |
| Some(body), |
| ); |
| } |
| ItemKind::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) => { |
| DefPathData::ValueNs(i.ident.name) |
| } |
| ItemKind::MacroDef(..) => DefPathData::MacroNs(i.ident.name), |
| ItemKind::Mac(..) => return self.visit_macro_invoc(i.id), |
| ItemKind::GlobalAsm(..) => DefPathData::Misc, |
| ItemKind::Use(..) => { |
| return visit::walk_item(self, i); |
| } |
| }; |
| let def = self.create_def(i.id, def_data, i.span); |
| |
| self.with_parent(def, |this| { |
| match i.kind { |
| ItemKind::Struct(ref struct_def, _) | ItemKind::Union(ref struct_def, _) => { |
| // If this is a unit or tuple-like struct, register the constructor. |
| if let Some(ctor_hir_id) = struct_def.ctor_id() { |
| this.create_def(ctor_hir_id, DefPathData::Ctor, i.span); |
| } |
| } |
| _ => {} |
| } |
| visit::walk_item(this, i); |
| }); |
| } |
| |
| fn visit_use_tree(&mut self, use_tree: &'a UseTree, id: NodeId, _nested: bool) { |
| self.create_def(id, DefPathData::Misc, use_tree.span); |
| visit::walk_use_tree(self, use_tree, id); |
| } |
| |
| fn visit_foreign_item(&mut self, foreign_item: &'a ForeignItem) { |
| if let ForeignItemKind::Macro(_) = foreign_item.kind { |
| return self.visit_macro_invoc(foreign_item.id); |
| } |
| |
| let def = self.create_def( |
| foreign_item.id, |
| DefPathData::ValueNs(foreign_item.ident.name), |
| foreign_item.span, |
| ); |
| |
| self.with_parent(def, |this| { |
| visit::walk_foreign_item(this, foreign_item); |
| }); |
| } |
| |
| fn visit_variant(&mut self, v: &'a Variant) { |
| if v.is_placeholder { |
| return self.visit_macro_invoc(v.id); |
| } |
| let def = self.create_def(v.id, DefPathData::TypeNs(v.ident.name), v.span); |
| self.with_parent(def, |this| { |
| if let Some(ctor_hir_id) = v.data.ctor_id() { |
| this.create_def(ctor_hir_id, DefPathData::Ctor, v.span); |
| } |
| visit::walk_variant(this, v) |
| }); |
| } |
| |
| fn visit_variant_data(&mut self, data: &'a VariantData) { |
| // The assumption here is that non-`cfg` macro expansion cannot change field indices. |
| // It currently holds because only inert attributes are accepted on fields, |
| // and every such attribute expands into a single field after it's resolved. |
| for (index, field) in data.fields().iter().enumerate() { |
| self.collect_field(field, Some(index)); |
| } |
| } |
| |
| fn visit_generic_param(&mut self, param: &'a GenericParam) { |
| if param.is_placeholder { |
| self.visit_macro_invoc(param.id); |
| return; |
| } |
| let name = param.ident.name; |
| let def_path_data = match param.kind { |
| GenericParamKind::Lifetime { .. } => DefPathData::LifetimeNs(name), |
| GenericParamKind::Type { .. } => DefPathData::TypeNs(name), |
| GenericParamKind::Const { .. } => DefPathData::ValueNs(name), |
| }; |
| self.create_def(param.id, def_path_data, param.ident.span); |
| |
| visit::walk_generic_param(self, param); |
| } |
| |
| fn visit_trait_item(&mut self, ti: &'a AssocItem) { |
| let def_data = match ti.kind { |
| AssocItemKind::Fn(..) | AssocItemKind::Const(..) => DefPathData::ValueNs(ti.ident.name), |
| AssocItemKind::TyAlias(..) => DefPathData::TypeNs(ti.ident.name), |
| AssocItemKind::Macro(..) => return self.visit_macro_invoc(ti.id), |
| }; |
| |
| let def = self.create_def(ti.id, def_data, ti.span); |
| self.with_parent(def, |this| visit::walk_trait_item(this, ti)); |
| } |
| |
| fn visit_impl_item(&mut self, ii: &'a AssocItem) { |
| let def_data = match ii.kind { |
| AssocItemKind::Fn(FnSig { ref header, ref decl }, ref body) |
| if header.asyncness.node.is_async() => |
| { |
| return self.visit_async_fn( |
| ii.id, |
| ii.ident.name, |
| ii.span, |
| header, |
| &ii.generics, |
| decl, |
| body.as_deref(), |
| ); |
| } |
| AssocItemKind::Fn(..) | AssocItemKind::Const(..) => DefPathData::ValueNs(ii.ident.name), |
| AssocItemKind::TyAlias(..) => DefPathData::TypeNs(ii.ident.name), |
| AssocItemKind::Macro(..) => return self.visit_macro_invoc(ii.id), |
| }; |
| |
| let def = self.create_def(ii.id, def_data, ii.span); |
| self.with_parent(def, |this| visit::walk_impl_item(this, ii)); |
| } |
| |
| fn visit_pat(&mut self, pat: &'a Pat) { |
| match pat.kind { |
| PatKind::Mac(..) => return self.visit_macro_invoc(pat.id), |
| _ => visit::walk_pat(self, pat), |
| } |
| } |
| |
| fn visit_anon_const(&mut self, constant: &'a AnonConst) { |
| let def = self.create_def(constant.id, DefPathData::AnonConst, constant.value.span); |
| self.with_parent(def, |this| visit::walk_anon_const(this, constant)); |
| } |
| |
| fn visit_expr(&mut self, expr: &'a Expr) { |
| let parent_def = match expr.kind { |
| ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id), |
| ExprKind::Closure(_, asyncness, ..) => { |
| // Async closures desugar to closures inside of closures, so |
| // we must create two defs. |
| let closure_def = self.create_def(expr.id, DefPathData::ClosureExpr, expr.span); |
| match asyncness { |
| IsAsync::Async { closure_id, .. } => { |
| self.create_def(closure_id, DefPathData::ClosureExpr, expr.span) |
| } |
| IsAsync::NotAsync => closure_def, |
| } |
| } |
| ExprKind::Async(_, async_id, _) => { |
| self.create_def(async_id, DefPathData::ClosureExpr, expr.span) |
| } |
| _ => self.parent_def, |
| }; |
| |
| self.with_parent(parent_def, |this| visit::walk_expr(this, expr)); |
| } |
| |
| fn visit_ty(&mut self, ty: &'a Ty) { |
| match ty.kind { |
| TyKind::Mac(..) => return self.visit_macro_invoc(ty.id), |
| TyKind::ImplTrait(node_id, _) => { |
| self.create_def(node_id, DefPathData::ImplTrait, ty.span); |
| } |
| _ => {} |
| } |
| visit::walk_ty(self, ty); |
| } |
| |
| fn visit_stmt(&mut self, stmt: &'a Stmt) { |
| match stmt.kind { |
| StmtKind::Mac(..) => self.visit_macro_invoc(stmt.id), |
| _ => visit::walk_stmt(self, stmt), |
| } |
| } |
| |
| fn visit_token(&mut self, t: Token) { |
| if let token::Interpolated(nt) = t.kind { |
| if let token::NtExpr(ref expr) = *nt { |
| if let ExprKind::Mac(..) = expr.kind { |
| self.visit_macro_invoc(expr.id); |
| } |
| } |
| } |
| } |
| |
| fn visit_arm(&mut self, arm: &'a Arm) { |
| if arm.is_placeholder { self.visit_macro_invoc(arm.id) } else { visit::walk_arm(self, arm) } |
| } |
| |
| fn visit_field(&mut self, f: &'a Field) { |
| if f.is_placeholder { self.visit_macro_invoc(f.id) } else { visit::walk_field(self, f) } |
| } |
| |
| fn visit_field_pattern(&mut self, fp: &'a FieldPat) { |
| if fp.is_placeholder { |
| self.visit_macro_invoc(fp.id) |
| } else { |
| visit::walk_field_pattern(self, fp) |
| } |
| } |
| |
| fn visit_param(&mut self, p: &'a Param) { |
| if p.is_placeholder { self.visit_macro_invoc(p.id) } else { visit::walk_param(self, p) } |
| } |
| |
| // This method is called only when we are visiting an individual field |
| // after expanding an attribute on it. |
| fn visit_struct_field(&mut self, field: &'a StructField) { |
| self.collect_field(field, None); |
| } |
| } |