| use crate::Resolver; |
| use log::debug; |
| use rustc_ast::ast::*; |
| use rustc_ast::token::{self, Token}; |
| use rustc_ast::visit::{self, FnKind}; |
| use rustc_ast::walk_list; |
| use rustc_ast_lowering::ResolverAstLowering; |
| use rustc_expand::expand::AstFragment; |
| use rustc_hir::def_id::LocalDefId; |
| use rustc_hir::definitions::*; |
| use rustc_span::hygiene::ExpnId; |
| use rustc_span::symbol::{kw, sym}; |
| use rustc_span::Span; |
| |
| crate fn collect_definitions( |
| resolver: &mut Resolver<'_>, |
| fragment: &AstFragment, |
| expansion: ExpnId, |
| ) { |
| let parent_def = resolver.invocation_parents[&expansion]; |
| fragment.visit_with(&mut DefCollector { resolver, parent_def, expansion }); |
| } |
| |
| /// Creates `DefId`s for nodes in the AST. |
| struct DefCollector<'a, 'b> { |
| resolver: &'a mut Resolver<'b>, |
| parent_def: LocalDefId, |
| expansion: ExpnId, |
| } |
| |
| impl<'a, 'b> DefCollector<'a, 'b> { |
| fn create_def(&mut self, node_id: NodeId, data: DefPathData, span: Span) -> LocalDefId { |
| let parent_def = self.parent_def; |
| debug!("create_def(node_id={:?}, data={:?}, parent_def={:?})", node_id, data, parent_def); |
| self.resolver.create_def(parent_def, node_id, data, self.expansion, span) |
| } |
| |
| fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_def: LocalDefId, f: F) { |
| let orig_parent_def = std::mem::replace(&mut self.parent_def, parent_def); |
| f(self); |
| self.parent_def = orig_parent_def; |
| } |
| |
| 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.resolver.placeholder_field_indices[&node_id] |
| }) |
| }; |
| |
| if field.is_placeholder { |
| let old_index = self.resolver.placeholder_field_indices.insert(field.id, index(self)); |
| assert!(old_index.is_none(), "placeholder field index is reset for a node ID"); |
| 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) { |
| let old_parent = |
| self.resolver.invocation_parents.insert(id.placeholder_to_expn_id(), self.parent_def); |
| assert!(old_parent.is_none(), "parent `LocalDefId` is reset for an invocation"); |
| } |
| } |
| |
| impl<'a, 'b> visit::Visitor<'a> for DefCollector<'a, 'b> { |
| 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::Static(..) | ItemKind::Const(..) | ItemKind::Fn(..) => { |
| DefPathData::ValueNs(i.ident.name) |
| } |
| ItemKind::MacroDef(..) => DefPathData::MacroNs(i.ident.name), |
| ItemKind::MacCall(..) => 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_fn(&mut self, fn_kind: FnKind<'a>, span: Span, _: NodeId) { |
| if let FnKind::Fn(_, _, sig, _, body) = fn_kind { |
| if let Async::Yes { closure_id, return_impl_trait_id, .. } = sig.header.asyncness { |
| self.create_def(return_impl_trait_id, DefPathData::ImplTrait, span); |
| |
| // For async functions, we need to create their inner defs inside of a |
| // closure to match their desugared representation. Besides that, |
| // we must mirror everything that `visit::walk_fn` below does. |
| self.visit_fn_header(&sig.header); |
| visit::walk_fn_decl(self, &sig.decl); |
| let closure_def = self.create_def(closure_id, DefPathData::ClosureExpr, span); |
| self.with_parent(closure_def, |this| walk_list!(this, visit_block, body)); |
| return; |
| } |
| } |
| |
| visit::walk_fn(self, fn_kind, span); |
| } |
| |
| 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::MacCall(_) = 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_assoc_item(&mut self, i: &'a AssocItem, ctxt: visit::AssocCtxt) { |
| let def_data = match &i.kind { |
| AssocItemKind::Fn(..) | AssocItemKind::Const(..) => DefPathData::ValueNs(i.ident.name), |
| AssocItemKind::TyAlias(..) => DefPathData::TypeNs(i.ident.name), |
| AssocItemKind::MacCall(..) => return self.visit_macro_invoc(i.id), |
| }; |
| |
| let def = self.create_def(i.id, def_data, i.span); |
| self.with_parent(def, |this| visit::walk_assoc_item(this, i, ctxt)); |
| } |
| |
| fn visit_pat(&mut self, pat: &'a Pat) { |
| match pat.kind { |
| PatKind::MacCall(..) => 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::MacCall(..) => 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 { |
| Async::Yes { closure_id, .. } => { |
| self.create_def(closure_id, DefPathData::ClosureExpr, expr.span) |
| } |
| Async::No => 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::MacCall(..) => 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::MacCall(..) => 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::MacCall(..) = 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); |
| } |
| } |
