--- /dev/null
+use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::sorted_map::SortedMap;
+use rustc_hir as hir;
+use rustc_hir::def_id::LocalDefId;
+use rustc_hir::definitions;
+use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
+use rustc_hir::*;
+use rustc_index::vec::{Idx, IndexVec};
+use rustc_session::Session;
+use rustc_span::source_map::SourceMap;
+use rustc_span::{Span, DUMMY_SP};
+
+use tracing::debug;
+
+/// A visitor that walks over the HIR and collects `Node`s into a HIR map.
+pub(super) struct NodeCollector<'a, 'hir> {
+ /// Source map
+ source_map: &'a SourceMap,
+ bodies: &'a SortedMap<ItemLocalId, &'hir Body<'hir>>,
+
+ /// Outputs
+ nodes: IndexVec<ItemLocalId, Option<ParentedNode<'hir>>>,
+ parenting: FxHashMap<LocalDefId, ItemLocalId>,
+
+ /// The parent of this node
+ parent_node: hir::ItemLocalId,
+
+ owner: LocalDefId,
+
+ definitions: &'a definitions::Definitions,
+}
+
+pub(super) fn index_hir<'hir>(
+ sess: &Session,
+ definitions: &definitions::Definitions,
+ item: hir::OwnerNode<'hir>,
+ bodies: &SortedMap<ItemLocalId, &'hir Body<'hir>>,
+) -> (IndexVec<ItemLocalId, Option<ParentedNode<'hir>>>, FxHashMap<LocalDefId, ItemLocalId>) {
+ let mut nodes = IndexVec::new();
+ // This node's parent should never be accessed: the owner's parent is computed by the
+ // hir_owner_parent query. Make it invalid (= ItemLocalId::MAX) to force an ICE whenever it is
+ // used.
+ nodes.push(Some(ParentedNode { parent: ItemLocalId::INVALID, node: item.into() }));
+ let mut collector = NodeCollector {
+ source_map: sess.source_map(),
+ definitions,
+ owner: item.def_id(),
+ parent_node: ItemLocalId::new(0),
+ nodes,
+ bodies,
+ parenting: FxHashMap::default(),
+ };
+
+ match item {
+ OwnerNode::Crate(citem) => collector.visit_mod(&citem, citem.inner, hir::CRATE_HIR_ID),
+ OwnerNode::Item(item) => collector.visit_item(item),
+ OwnerNode::TraitItem(item) => collector.visit_trait_item(item),
+ OwnerNode::ImplItem(item) => collector.visit_impl_item(item),
+ OwnerNode::ForeignItem(item) => collector.visit_foreign_item(item),
+ };
+
+ (collector.nodes, collector.parenting)
+}
+
+impl<'a, 'hir> NodeCollector<'a, 'hir> {
+ fn insert(&mut self, span: Span, hir_id: HirId, node: Node<'hir>) {
+ debug_assert_eq!(self.owner, hir_id.owner);
+ debug_assert_ne!(hir_id.local_id.as_u32(), 0);
+
+ // Make sure that the DepNode of some node coincides with the HirId
+ // owner of that node.
+ if cfg!(debug_assertions) {
+ if hir_id.owner != self.owner {
+ panic!(
+ "inconsistent DepNode at `{:?}` for `{:?}`: \
+ current_dep_node_owner={} ({:?}), hir_id.owner={} ({:?})",
+ self.source_map.span_to_diagnostic_string(span),
+ node,
+ self.definitions.def_path(self.owner).to_string_no_crate_verbose(),
+ self.owner,
+ self.definitions.def_path(hir_id.owner).to_string_no_crate_verbose(),
+ hir_id.owner,
+ )
+ }
+ }
+
+ self.nodes.insert(hir_id.local_id, ParentedNode { parent: self.parent_node, node: node });
+ }
+
+ fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_node_id: HirId, f: F) {
+ debug_assert_eq!(parent_node_id.owner, self.owner);
+ let parent_node = self.parent_node;
+ self.parent_node = parent_node_id.local_id;
+ f(self);
+ self.parent_node = parent_node;
+ }
+
+ fn insert_nested(&mut self, item: LocalDefId) {
+ self.parenting.insert(item, self.parent_node);
+ }
+}
+
+impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
+ type Map = !;
+
+ /// Because we want to track parent items and so forth, enable
+ /// deep walking so that we walk nested items in the context of
+ /// their outer items.
+
+ fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
+ panic!("`visit_nested_xxx` must be manually implemented in this visitor");
+ }
+
+ fn visit_nested_item(&mut self, item: ItemId) {
+ debug!("visit_nested_item: {:?}", item);
+ self.insert_nested(item.def_id);
+ }
+
+ fn visit_nested_trait_item(&mut self, item_id: TraitItemId) {
+ self.insert_nested(item_id.def_id);
+ }
+
+ fn visit_nested_impl_item(&mut self, item_id: ImplItemId) {
+ self.insert_nested(item_id.def_id);
+ }
+
+ fn visit_nested_foreign_item(&mut self, foreign_id: ForeignItemId) {
+ self.insert_nested(foreign_id.def_id);
+ }
+
+ fn visit_nested_body(&mut self, id: BodyId) {
+ debug_assert_eq!(id.hir_id.owner, self.owner);
+ let body = self.bodies[&id.hir_id.local_id];
+ self.visit_body(body);
+ }
+
+ fn visit_param(&mut self, param: &'hir Param<'hir>) {
+ let node = Node::Param(param);
+ self.insert(param.pat.span, param.hir_id, node);
+ self.with_parent(param.hir_id, |this| {
+ intravisit::walk_param(this, param);
+ });
+ }
+
+ fn visit_item(&mut self, i: &'hir Item<'hir>) {
+ debug!("visit_item: {:?}", i);
+ debug_assert_eq!(i.def_id, self.owner);
+ self.with_parent(i.hir_id(), |this| {
+ if let ItemKind::Struct(ref struct_def, _) = i.kind {
+ // If this is a tuple or unit-like struct, register the constructor.
+ if let Some(ctor_hir_id) = struct_def.ctor_hir_id() {
+ this.insert(i.span, ctor_hir_id, Node::Ctor(struct_def));
+ }
+ }
+ intravisit::walk_item(this, i);
+ });
+ }
+
+ fn visit_foreign_item(&mut self, fi: &'hir ForeignItem<'hir>) {
+ debug_assert_eq!(fi.def_id, self.owner);
+ self.with_parent(fi.hir_id(), |this| {
+ intravisit::walk_foreign_item(this, fi);
+ });
+ }
+
+ fn visit_generic_param(&mut self, param: &'hir GenericParam<'hir>) {
+ self.insert(param.span, param.hir_id, Node::GenericParam(param));
+ intravisit::walk_generic_param(self, param);
+ }
+
+ fn visit_const_param_default(&mut self, param: HirId, ct: &'hir AnonConst) {
+ self.with_parent(param, |this| {
+ intravisit::walk_const_param_default(this, ct);
+ })
+ }
+
+ fn visit_trait_item(&mut self, ti: &'hir TraitItem<'hir>) {
+ debug_assert_eq!(ti.def_id, self.owner);
+ self.with_parent(ti.hir_id(), |this| {
+ intravisit::walk_trait_item(this, ti);
+ });
+ }
+
+ fn visit_impl_item(&mut self, ii: &'hir ImplItem<'hir>) {
+ debug_assert_eq!(ii.def_id, self.owner);
+ self.with_parent(ii.hir_id(), |this| {
+ intravisit::walk_impl_item(this, ii);
+ });
+ }
+
+ fn visit_pat(&mut self, pat: &'hir Pat<'hir>) {
+ let node =
+ if let PatKind::Binding(..) = pat.kind { Node::Binding(pat) } else { Node::Pat(pat) };
+ self.insert(pat.span, pat.hir_id, node);
+
+ self.with_parent(pat.hir_id, |this| {
+ intravisit::walk_pat(this, pat);
+ });
+ }
+
+ fn visit_arm(&mut self, arm: &'hir Arm<'hir>) {
+ let node = Node::Arm(arm);
+
+ self.insert(arm.span, arm.hir_id, node);
+
+ self.with_parent(arm.hir_id, |this| {
+ intravisit::walk_arm(this, arm);
+ });
+ }
+
+ fn visit_anon_const(&mut self, constant: &'hir AnonConst) {
+ self.insert(DUMMY_SP, constant.hir_id, Node::AnonConst(constant));
+
+ self.with_parent(constant.hir_id, |this| {
+ intravisit::walk_anon_const(this, constant);
+ });
+ }
+
+ fn visit_expr(&mut self, expr: &'hir Expr<'hir>) {
+ self.insert(expr.span, expr.hir_id, Node::Expr(expr));
+
+ self.with_parent(expr.hir_id, |this| {
+ intravisit::walk_expr(this, expr);
+ });
+ }
+
+ fn visit_stmt(&mut self, stmt: &'hir Stmt<'hir>) {
+ self.insert(stmt.span, stmt.hir_id, Node::Stmt(stmt));
+
+ self.with_parent(stmt.hir_id, |this| {
+ intravisit::walk_stmt(this, stmt);
+ });
+ }
+
+ fn visit_path_segment(&mut self, path_span: Span, path_segment: &'hir PathSegment<'hir>) {
+ if let Some(hir_id) = path_segment.hir_id {
+ self.insert(path_span, hir_id, Node::PathSegment(path_segment));
+ }
+ intravisit::walk_path_segment(self, path_span, path_segment);
+ }
+
+ fn visit_ty(&mut self, ty: &'hir Ty<'hir>) {
+ self.insert(ty.span, ty.hir_id, Node::Ty(ty));
+
+ self.with_parent(ty.hir_id, |this| {
+ intravisit::walk_ty(this, ty);
+ });
+ }
+
+ fn visit_infer(&mut self, inf: &'hir InferArg) {
+ self.insert(inf.span, inf.hir_id, Node::Infer(inf));
+
+ self.with_parent(inf.hir_id, |this| {
+ intravisit::walk_inf(this, inf);
+ });
+ }
+
+ fn visit_trait_ref(&mut self, tr: &'hir TraitRef<'hir>) {
+ self.insert(tr.path.span, tr.hir_ref_id, Node::TraitRef(tr));
+
+ self.with_parent(tr.hir_ref_id, |this| {
+ intravisit::walk_trait_ref(this, tr);
+ });
+ }
+
+ fn visit_fn(
+ &mut self,
+ fk: intravisit::FnKind<'hir>,
+ fd: &'hir FnDecl<'hir>,
+ b: BodyId,
+ s: Span,
+ id: HirId,
+ ) {
+ assert_eq!(self.owner, id.owner);
+ assert_eq!(self.parent_node, id.local_id);
+ intravisit::walk_fn(self, fk, fd, b, s, id);
+ }
+
+ fn visit_block(&mut self, block: &'hir Block<'hir>) {
+ self.insert(block.span, block.hir_id, Node::Block(block));
+ self.with_parent(block.hir_id, |this| {
+ intravisit::walk_block(this, block);
+ });
+ }
+
+ fn visit_local(&mut self, l: &'hir Local<'hir>) {
+ self.insert(l.span, l.hir_id, Node::Local(l));
+ self.with_parent(l.hir_id, |this| {
+ intravisit::walk_local(this, l);
+ })
+ }
+
+ fn visit_lifetime(&mut self, lifetime: &'hir Lifetime) {
+ self.insert(lifetime.span, lifetime.hir_id, Node::Lifetime(lifetime));
+ }
+
+ fn visit_vis(&mut self, visibility: &'hir Visibility<'hir>) {
+ match visibility.node {
+ VisibilityKind::Public | VisibilityKind::Crate(_) | VisibilityKind::Inherited => {}
+ VisibilityKind::Restricted { hir_id, .. } => {
+ self.insert(visibility.span, hir_id, Node::Visibility(visibility));
+ self.with_parent(hir_id, |this| {
+ intravisit::walk_vis(this, visibility);
+ });
+ }
+ }
+ }
+
+ fn visit_variant(&mut self, v: &'hir Variant<'hir>, g: &'hir Generics<'hir>, item_id: HirId) {
+ self.insert(v.span, v.id, Node::Variant(v));
+ self.with_parent(v.id, |this| {
+ // Register the constructor of this variant.
+ if let Some(ctor_hir_id) = v.data.ctor_hir_id() {
+ this.insert(v.span, ctor_hir_id, Node::Ctor(&v.data));
+ }
+ intravisit::walk_variant(this, v, g, item_id);
+ });
+ }
+
+ fn visit_field_def(&mut self, field: &'hir FieldDef<'hir>) {
+ self.insert(field.span, field.hir_id, Node::Field(field));
+ self.with_parent(field.hir_id, |this| {
+ intravisit::walk_field_def(this, field);
+ });
+ }
+
+ fn visit_trait_item_ref(&mut self, ii: &'hir TraitItemRef) {
+ // Do not visit the duplicate information in TraitItemRef. We want to
+ // map the actual nodes, not the duplicate ones in the *Ref.
+ let TraitItemRef { id, ident: _, kind: _, span: _, defaultness: _ } = *ii;
+
+ self.visit_nested_trait_item(id);
+ }
+
+ fn visit_impl_item_ref(&mut self, ii: &'hir ImplItemRef) {
+ // Do not visit the duplicate information in ImplItemRef. We want to
+ // map the actual nodes, not the duplicate ones in the *Ref.
+ let ImplItemRef { id, ident: _, kind: _, span: _, defaultness: _ } = *ii;
+
+ self.visit_nested_impl_item(id);
+ }
+
+ fn visit_foreign_item_ref(&mut self, fi: &'hir ForeignItemRef) {
+ // Do not visit the duplicate information in ForeignItemRef. We want to
+ // map the actual nodes, not the duplicate ones in the *Ref.
+ let ForeignItemRef { id, ident: _, span: _ } = *fi;
+
+ self.visit_nested_foreign_item(id);
+ }
+}
projects / rustc.git / blobdiff