1 use crate::hir::{ModuleItems, Owner};
2 use crate::ty::{DefIdTree, TyCtxt};
4 use rustc_data_structures::fingerprint::Fingerprint;
5 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
6 use rustc_data_structures::svh::Svh;
7 use rustc_data_structures::sync::{par_for_each_in, Send, Sync};
8 use rustc_hir::def::{DefKind, Res};
9 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_ID, LOCAL_CRATE};
10 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
11 use rustc_hir::intravisit::{self, Visitor};
12 use rustc_hir::itemlikevisit::ItemLikeVisitor;
14 use rustc_index::vec::Idx;
15 use rustc_middle::hir::nested_filter;
16 use rustc_span::def_id::StableCrateId;
17 use rustc_span::source_map::Spanned;
18 use rustc_span::symbol::{kw, sym, Ident, Symbol};
20 use rustc_target::spec::abi::Abi;
21 use std::collections::VecDeque;
23 fn fn_decl<'hir>(node: Node<'hir>) -> Option<&'hir FnDecl<'hir>> {
25 Node::Item(Item { kind: ItemKind::Fn(sig, _, _), .. })
26 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, _), .. })
27 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, _), .. }) => Some(&sig.decl),
28 Node::Expr(Expr { kind: ExprKind::Closure(_, fn_decl, ..), .. })
29 | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(fn_decl, ..), .. }) => {
36 pub fn fn_sig<'hir>(node: Node<'hir>) -> Option<&'hir FnSig<'hir>> {
38 Node::Item(Item { kind: ItemKind::Fn(sig, _, _), .. })
39 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, _), .. })
40 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, _), .. }) => Some(sig),
45 pub fn associated_body<'hir>(node: Node<'hir>) -> Option<BodyId> {
48 kind: ItemKind::Const(_, body) | ItemKind::Static(.., body) | ItemKind::Fn(.., body),
51 | Node::TraitItem(TraitItem {
53 TraitItemKind::Const(_, Some(body)) | TraitItemKind::Fn(_, TraitFn::Provided(body)),
56 | Node::ImplItem(ImplItem {
57 kind: ImplItemKind::Const(_, body) | ImplItemKind::Fn(_, body),
60 | Node::Expr(Expr { kind: ExprKind::Closure(.., body, _, _), .. }) => Some(*body),
62 Node::AnonConst(constant) => Some(constant.body),
68 fn is_body_owner<'hir>(node: Node<'hir>, hir_id: HirId) -> bool {
69 match associated_body(node) {
70 Some(b) => b.hir_id == hir_id,
75 #[derive(Copy, Clone)]
76 pub struct Map<'hir> {
77 pub(super) tcx: TyCtxt<'hir>,
80 /// An iterator that walks up the ancestor tree of a given `HirId`.
81 /// Constructed using `tcx.hir().parent_iter(hir_id)`.
82 pub struct ParentHirIterator<'hir> {
87 impl<'hir> Iterator for ParentHirIterator<'hir> {
88 type Item = (HirId, Node<'hir>);
90 fn next(&mut self) -> Option<Self::Item> {
91 if self.current_id == CRATE_HIR_ID {
95 // There are nodes that do not have entries, so we need to skip them.
96 let parent_id = self.map.get_parent_node(self.current_id);
98 if parent_id == self.current_id {
99 self.current_id = CRATE_HIR_ID;
103 self.current_id = parent_id;
104 if let Some(node) = self.map.find(parent_id) {
105 return Some((parent_id, node));
107 // If this `HirId` doesn't have an entry, skip it and look for its `parent_id`.
112 /// An iterator that walks up the ancestor tree of a given `HirId`.
113 /// Constructed using `tcx.hir().parent_owner_iter(hir_id)`.
114 pub struct ParentOwnerIterator<'hir> {
119 impl<'hir> Iterator for ParentOwnerIterator<'hir> {
120 type Item = (LocalDefId, OwnerNode<'hir>);
122 fn next(&mut self) -> Option<Self::Item> {
123 if self.current_id.local_id.index() != 0 {
124 self.current_id.local_id = ItemLocalId::new(0);
125 if let Some(node) = self.map.tcx.hir_owner(self.current_id.owner) {
126 return Some((self.current_id.owner, node.node));
129 if self.current_id == CRATE_HIR_ID {
133 // There are nodes that do not have entries, so we need to skip them.
134 let parent_id = self.map.def_key(self.current_id.owner).parent;
136 let parent_id = parent_id.map_or(CRATE_HIR_ID.owner, |local_def_index| {
137 let def_id = LocalDefId { local_def_index };
138 self.map.local_def_id_to_hir_id(def_id).owner
140 self.current_id = HirId::make_owner(parent_id);
142 // If this `HirId` doesn't have an entry, skip it and look for its `parent_id`.
143 if let Some(node) = self.map.tcx.hir_owner(self.current_id.owner) {
144 return Some((self.current_id.owner, node.node));
150 impl<'hir> Map<'hir> {
151 pub fn krate(self) -> &'hir Crate<'hir> {
152 self.tcx.hir_crate(())
155 pub fn root_module(self) -> &'hir Mod<'hir> {
156 match self.tcx.hir_owner(CRATE_DEF_ID).map(|o| o.node) {
157 Some(OwnerNode::Crate(item)) => item,
162 pub fn items(self) -> impl Iterator<Item = &'hir Item<'hir>> + 'hir {
163 let krate = self.krate();
164 krate.owners.iter().filter_map(|owner| match owner.as_owner()?.node() {
165 OwnerNode::Item(item) => Some(item),
170 pub fn def_key(self, def_id: LocalDefId) -> DefKey {
171 // Accessing the DefKey is ok, since it is part of DefPathHash.
172 self.tcx.untracked_resolutions.definitions.def_key(def_id)
175 pub fn def_path_from_hir_id(self, id: HirId) -> Option<DefPath> {
176 self.opt_local_def_id(id).map(|def_id| self.def_path(def_id))
179 pub fn def_path(self, def_id: LocalDefId) -> DefPath {
180 // Accessing the DefPath is ok, since it is part of DefPathHash.
181 self.tcx.untracked_resolutions.definitions.def_path(def_id)
185 pub fn def_path_hash(self, def_id: LocalDefId) -> DefPathHash {
186 // Accessing the DefPathHash is ok, it is incr. comp. stable.
187 self.tcx.untracked_resolutions.definitions.def_path_hash(def_id)
191 pub fn local_def_id(self, hir_id: HirId) -> LocalDefId {
192 self.opt_local_def_id(hir_id).unwrap_or_else(|| {
194 "local_def_id: no entry for `{:?}`, which has a map of `{:?}`",
202 pub fn opt_local_def_id(self, hir_id: HirId) -> Option<LocalDefId> {
203 if hir_id.local_id == ItemLocalId::new(0) {
207 .hir_owner_nodes(hir_id.owner)
210 .get(&hir_id.local_id)
216 pub fn local_def_id_to_hir_id(self, def_id: LocalDefId) -> HirId {
217 self.tcx.local_def_id_to_hir_id(def_id)
220 pub fn iter_local_def_id(self) -> impl Iterator<Item = LocalDefId> + 'hir {
221 // Create a dependency to the crate to be sure we re-execute this when the amount of
222 // definitions change.
223 self.tcx.ensure().hir_crate(());
224 self.tcx.untracked_resolutions.definitions.iter_local_def_id()
227 pub fn opt_def_kind(self, local_def_id: LocalDefId) -> Option<DefKind> {
228 let hir_id = self.local_def_id_to_hir_id(local_def_id);
229 let def_kind = match self.find(hir_id)? {
230 Node::Item(item) => match item.kind {
231 ItemKind::Static(_, mt, _) => DefKind::Static(mt),
232 ItemKind::Const(..) => DefKind::Const,
233 ItemKind::Fn(..) => DefKind::Fn,
234 ItemKind::Macro(_, macro_kind) => DefKind::Macro(macro_kind),
235 ItemKind::Mod(..) => DefKind::Mod,
236 ItemKind::OpaqueTy(..) => DefKind::OpaqueTy,
237 ItemKind::TyAlias(..) => DefKind::TyAlias,
238 ItemKind::Enum(..) => DefKind::Enum,
239 ItemKind::Struct(..) => DefKind::Struct,
240 ItemKind::Union(..) => DefKind::Union,
241 ItemKind::Trait(..) => DefKind::Trait,
242 ItemKind::TraitAlias(..) => DefKind::TraitAlias,
243 ItemKind::ExternCrate(_) => DefKind::ExternCrate,
244 ItemKind::Use(..) => DefKind::Use,
245 ItemKind::ForeignMod { .. } => DefKind::ForeignMod,
246 ItemKind::GlobalAsm(..) => DefKind::GlobalAsm,
247 ItemKind::Impl { .. } => DefKind::Impl,
249 Node::ForeignItem(item) => match item.kind {
250 ForeignItemKind::Fn(..) => DefKind::Fn,
251 ForeignItemKind::Static(_, mt) => DefKind::Static(mt),
252 ForeignItemKind::Type => DefKind::ForeignTy,
254 Node::TraitItem(item) => match item.kind {
255 TraitItemKind::Const(..) => DefKind::AssocConst,
256 TraitItemKind::Fn(..) => DefKind::AssocFn,
257 TraitItemKind::Type(..) => DefKind::AssocTy,
259 Node::ImplItem(item) => match item.kind {
260 ImplItemKind::Const(..) => DefKind::AssocConst,
261 ImplItemKind::Fn(..) => DefKind::AssocFn,
262 ImplItemKind::TyAlias(..) => DefKind::AssocTy,
264 Node::Variant(_) => DefKind::Variant,
265 Node::Ctor(variant_data) => {
266 // FIXME(eddyb) is this even possible, if we have a `Node::Ctor`?
267 assert_ne!(variant_data.ctor_hir_id(), None);
269 let ctor_of = match self.find(self.get_parent_node(hir_id)) {
270 Some(Node::Item(..)) => def::CtorOf::Struct,
271 Some(Node::Variant(..)) => def::CtorOf::Variant,
274 DefKind::Ctor(ctor_of, def::CtorKind::from_hir(variant_data))
276 Node::AnonConst(_) => {
277 let inline = match self.find(self.get_parent_node(hir_id)) {
278 Some(Node::Expr(&Expr {
279 kind: ExprKind::ConstBlock(ref anon_const), ..
280 })) if anon_const.hir_id == hir_id => true,
283 if inline { DefKind::InlineConst } else { DefKind::AnonConst }
285 Node::Field(_) => DefKind::Field,
286 Node::Expr(expr) => match expr.kind {
287 ExprKind::Closure(.., None) => DefKind::Closure,
288 ExprKind::Closure(.., Some(_)) => DefKind::Generator,
289 _ => bug!("def_kind: unsupported node: {}", self.node_to_string(hir_id)),
291 Node::GenericParam(param) => match param.kind {
292 GenericParamKind::Lifetime { .. } => DefKind::LifetimeParam,
293 GenericParamKind::Type { .. } => DefKind::TyParam,
294 GenericParamKind::Const { .. } => DefKind::ConstParam,
296 Node::Crate(_) => DefKind::Mod,
298 | Node::PathSegment(_)
308 | Node::Visibility(_)
309 | Node::Block(_) => return None,
314 pub fn def_kind(self, local_def_id: LocalDefId) -> DefKind {
315 self.opt_def_kind(local_def_id)
316 .unwrap_or_else(|| bug!("def_kind: unsupported node: {:?}", local_def_id))
319 pub fn find_parent_node(self, id: HirId) -> Option<HirId> {
320 if id.local_id == ItemLocalId::from_u32(0) {
321 Some(self.tcx.hir_owner_parent(id.owner))
323 let owner = self.tcx.hir_owner_nodes(id.owner).as_owner()?;
324 let node = owner.nodes[id.local_id].as_ref()?;
325 let hir_id = HirId { owner: id.owner, local_id: node.parent };
330 pub fn get_parent_node(self, hir_id: HirId) -> HirId {
331 self.find_parent_node(hir_id).unwrap()
334 /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found.
335 pub fn find(self, id: HirId) -> Option<Node<'hir>> {
336 if id.local_id == ItemLocalId::from_u32(0) {
337 let owner = self.tcx.hir_owner(id.owner)?;
338 Some(owner.node.into())
340 let owner = self.tcx.hir_owner_nodes(id.owner).as_owner()?;
341 let node = owner.nodes[id.local_id].as_ref()?;
346 /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found.
348 pub fn find_by_def_id(self, id: LocalDefId) -> Option<Node<'hir>> {
349 self.find(self.local_def_id_to_hir_id(id))
352 /// Retrieves the `Node` corresponding to `id`, panicking if it cannot be found.
353 pub fn get(self, id: HirId) -> Node<'hir> {
354 self.find(id).unwrap_or_else(|| bug!("couldn't find hir id {} in the HIR map", id))
357 /// Retrieves the `Node` corresponding to `id`, panicking if it cannot be found.
359 pub fn get_by_def_id(self, id: LocalDefId) -> Node<'hir> {
360 self.find_by_def_id(id).unwrap_or_else(|| bug!("couldn't find {:?} in the HIR map", id))
363 pub fn get_if_local(self, id: DefId) -> Option<Node<'hir>> {
364 id.as_local().and_then(|id| self.find(self.local_def_id_to_hir_id(id)))
367 pub fn get_generics(self, id: LocalDefId) -> Option<&'hir Generics<'hir>> {
368 let node = self.tcx.hir_owner(id)?;
370 OwnerNode::ImplItem(impl_item) => Some(&impl_item.generics),
371 OwnerNode::TraitItem(trait_item) => Some(&trait_item.generics),
372 OwnerNode::Item(Item {
374 ItemKind::Fn(_, generics, _)
375 | ItemKind::TyAlias(_, generics)
376 | ItemKind::Enum(_, generics)
377 | ItemKind::Struct(_, generics)
378 | ItemKind::Union(_, generics)
379 | ItemKind::Trait(_, _, generics, ..)
380 | ItemKind::TraitAlias(generics, _)
381 | ItemKind::Impl(Impl { generics, .. }),
383 }) => Some(generics),
388 pub fn item(self, id: ItemId) -> &'hir Item<'hir> {
389 self.tcx.hir_owner(id.def_id).unwrap().node.expect_item()
392 pub fn trait_item(self, id: TraitItemId) -> &'hir TraitItem<'hir> {
393 self.tcx.hir_owner(id.def_id).unwrap().node.expect_trait_item()
396 pub fn impl_item(self, id: ImplItemId) -> &'hir ImplItem<'hir> {
397 self.tcx.hir_owner(id.def_id).unwrap().node.expect_impl_item()
400 pub fn foreign_item(self, id: ForeignItemId) -> &'hir ForeignItem<'hir> {
401 self.tcx.hir_owner(id.def_id).unwrap().node.expect_foreign_item()
404 pub fn body(self, id: BodyId) -> &'hir Body<'hir> {
405 self.tcx.hir_owner_nodes(id.hir_id.owner).unwrap().bodies[&id.hir_id.local_id]
408 pub fn fn_decl_by_hir_id(self, hir_id: HirId) -> Option<&'hir FnDecl<'hir>> {
409 if let Some(node) = self.find(hir_id) {
412 bug!("no node for hir_id `{}`", hir_id)
416 pub fn fn_sig_by_hir_id(self, hir_id: HirId) -> Option<&'hir FnSig<'hir>> {
417 if let Some(node) = self.find(hir_id) {
420 bug!("no node for hir_id `{}`", hir_id)
424 pub fn enclosing_body_owner(self, hir_id: HirId) -> HirId {
425 for (parent, _) in self.parent_iter(hir_id) {
426 if let Some(body) = self.maybe_body_owned_by(parent) {
427 return self.body_owner(body);
431 bug!("no `enclosing_body_owner` for hir_id `{}`", hir_id);
434 /// Returns the `HirId` that corresponds to the definition of
435 /// which this is the body of, i.e., a `fn`, `const` or `static`
436 /// item (possibly associated), a closure, or a `hir::AnonConst`.
437 pub fn body_owner(self, BodyId { hir_id }: BodyId) -> HirId {
438 let parent = self.get_parent_node(hir_id);
439 assert!(self.find(parent).map_or(false, |n| is_body_owner(n, hir_id)));
443 pub fn body_owner_def_id(self, id: BodyId) -> LocalDefId {
444 self.local_def_id(self.body_owner(id))
447 /// Given a `HirId`, returns the `BodyId` associated with it,
448 /// if the node is a body owner, otherwise returns `None`.
449 pub fn maybe_body_owned_by(self, hir_id: HirId) -> Option<BodyId> {
450 self.find(hir_id).map(associated_body).flatten()
453 /// Given a body owner's id, returns the `BodyId` associated with it.
454 pub fn body_owned_by(self, id: HirId) -> BodyId {
455 self.maybe_body_owned_by(id).unwrap_or_else(|| {
458 "body_owned_by: {} has no associated body",
459 self.node_to_string(id)
464 pub fn body_param_names(self, id: BodyId) -> impl Iterator<Item = Ident> + 'hir {
465 self.body(id).params.iter().map(|arg| match arg.pat.kind {
466 PatKind::Binding(_, _, ident, _) => ident,
471 /// Returns the `BodyOwnerKind` of this `LocalDefId`.
473 /// Panics if `LocalDefId` does not have an associated body.
474 pub fn body_owner_kind(self, def_id: LocalDefId) -> BodyOwnerKind {
475 match self.tcx.def_kind(def_id) {
476 DefKind::Const | DefKind::AssocConst | DefKind::InlineConst | DefKind::AnonConst => {
479 DefKind::Ctor(..) | DefKind::Fn | DefKind::AssocFn => BodyOwnerKind::Fn,
480 DefKind::Closure | DefKind::Generator => BodyOwnerKind::Closure,
481 DefKind::Static(mt) => BodyOwnerKind::Static(mt),
482 dk => bug!("{:?} is not a body node: {:?}", def_id, dk),
486 /// Returns the `ConstContext` of the body associated with this `LocalDefId`.
488 /// Panics if `LocalDefId` does not have an associated body.
490 /// This should only be used for determining the context of a body, a return
491 /// value of `Some` does not always suggest that the owner of the body is `const`,
492 /// just that it has to be checked as if it were.
493 pub fn body_const_context(self, def_id: LocalDefId) -> Option<ConstContext> {
494 let ccx = match self.body_owner_kind(def_id) {
495 BodyOwnerKind::Const => ConstContext::Const,
496 BodyOwnerKind::Static(mt) => ConstContext::Static(mt),
498 BodyOwnerKind::Fn if self.tcx.is_constructor(def_id.to_def_id()) => return None,
499 BodyOwnerKind::Fn if self.tcx.is_const_fn_raw(def_id.to_def_id()) => {
500 ConstContext::ConstFn
503 if self.tcx.has_attr(def_id.to_def_id(), sym::default_method_body_is_const) =>
505 ConstContext::ConstFn
507 BodyOwnerKind::Fn | BodyOwnerKind::Closure => return None,
513 /// Returns an iterator of the `DefId`s for all body-owners in this
514 /// crate. If you would prefer to iterate over the bodies
515 /// themselves, you can do `self.hir().krate().body_ids.iter()`.
516 pub fn body_owners(self) -> impl Iterator<Item = LocalDefId> + 'hir {
520 .flat_map(move |(owner, owner_info)| {
521 let bodies = &owner_info.as_owner()?.nodes.bodies;
522 Some(bodies.iter().map(move |&(local_id, _)| {
523 let hir_id = HirId { owner, local_id };
524 let body_id = BodyId { hir_id };
525 self.body_owner_def_id(body_id)
531 pub fn par_body_owners<F: Fn(LocalDefId) + Sync + Send>(self, f: F) {
532 use rustc_data_structures::sync::{par_iter, ParallelIterator};
533 #[cfg(parallel_compiler)]
534 use rustc_rayon::iter::IndexedParallelIterator;
536 par_iter(&self.krate().owners.raw).enumerate().for_each(|(owner, owner_info)| {
537 let owner = LocalDefId::new(owner);
538 if let MaybeOwner::Owner(owner_info) = owner_info {
539 par_iter(owner_info.nodes.bodies.range(..)).for_each(|(local_id, _)| {
540 let hir_id = HirId { owner, local_id: *local_id };
541 let body_id = BodyId { hir_id };
542 f(self.body_owner_def_id(body_id))
548 pub fn ty_param_owner(self, def_id: LocalDefId) -> LocalDefId {
549 let def_kind = self.tcx.def_kind(def_id);
551 DefKind::Trait | DefKind::TraitAlias => def_id,
552 DefKind::TyParam | DefKind::ConstParam => self.tcx.local_parent(def_id).unwrap(),
553 _ => bug!("ty_param_owner: {:?} is a {:?} not a type parameter", def_id, def_kind),
557 pub fn ty_param_name(self, id: HirId) -> Symbol {
559 Node::Item(&Item { kind: ItemKind::Trait(..) | ItemKind::TraitAlias(..), .. }) => {
562 Node::GenericParam(param) => param.name.ident().name,
563 _ => bug!("ty_param_name: {} not a type parameter", self.node_to_string(id)),
567 pub fn trait_impls(self, trait_did: DefId) -> &'hir [LocalDefId] {
568 self.tcx.all_local_trait_impls(()).get(&trait_did).map_or(&[], |xs| &xs[..])
571 /// Gets the attributes on the crate. This is preferable to
572 /// invoking `krate.attrs` because it registers a tighter
573 /// dep-graph access.
574 pub fn krate_attrs(self) -> &'hir [ast::Attribute] {
575 self.attrs(CRATE_HIR_ID)
578 pub fn rustc_coherence_is_core(self) -> bool {
579 self.krate_attrs().iter().any(|attr| attr.has_name(sym::rustc_coherence_is_core))
582 pub fn get_module(self, module: LocalDefId) -> (&'hir Mod<'hir>, Span, HirId) {
583 let hir_id = HirId::make_owner(module);
584 match self.tcx.hir_owner(module).map(|o| o.node) {
585 Some(OwnerNode::Item(&Item { span, kind: ItemKind::Mod(ref m), .. })) => {
588 Some(OwnerNode::Crate(item)) => (item, item.inner, hir_id),
589 node => panic!("not a module: {:?}", node),
593 /// Walks the contents of a crate. See also `Crate::visit_all_items`.
594 pub fn walk_toplevel_module(self, visitor: &mut impl Visitor<'hir>) {
595 let (top_mod, span, hir_id) = self.get_module(CRATE_DEF_ID);
596 visitor.visit_mod(top_mod, span, hir_id);
599 /// Walks the attributes in a crate.
600 pub fn walk_attributes(self, visitor: &mut impl Visitor<'hir>) {
601 let krate = self.krate();
602 for (owner, info) in krate.owners.iter_enumerated() {
603 if let MaybeOwner::Owner(info) = info {
604 for (local_id, attrs) in info.attrs.map.iter() {
605 let id = HirId { owner, local_id: *local_id };
607 visitor.visit_attribute(id, a)
614 /// Visits all items in the crate in some deterministic (but
615 /// unspecified) order. If you just need to process every item,
616 /// but don't care about nesting, this method is the best choice.
618 /// If you do care about nesting -- usually because your algorithm
619 /// follows lexical scoping rules -- then you want a different
620 /// approach. You should override `visit_nested_item` in your
621 /// visitor and then call `intravisit::walk_crate` instead.
622 pub fn visit_all_item_likes<V>(self, visitor: &mut V)
624 V: itemlikevisit::ItemLikeVisitor<'hir>,
626 let krate = self.krate();
627 for owner in krate.owners.iter().filter_map(|i| i.as_owner()) {
629 OwnerNode::Item(item) => visitor.visit_item(item),
630 OwnerNode::ForeignItem(item) => visitor.visit_foreign_item(item),
631 OwnerNode::ImplItem(item) => visitor.visit_impl_item(item),
632 OwnerNode::TraitItem(item) => visitor.visit_trait_item(item),
633 OwnerNode::Crate(_) => {}
638 /// A parallel version of `visit_all_item_likes`.
639 pub fn par_visit_all_item_likes<V>(self, visitor: &V)
641 V: itemlikevisit::ParItemLikeVisitor<'hir> + Sync + Send,
643 let krate = self.krate();
644 par_for_each_in(&krate.owners.raw, |owner| match owner.map(OwnerInfo::node) {
645 MaybeOwner::Owner(OwnerNode::Item(item)) => visitor.visit_item(item),
646 MaybeOwner::Owner(OwnerNode::ForeignItem(item)) => visitor.visit_foreign_item(item),
647 MaybeOwner::Owner(OwnerNode::ImplItem(item)) => visitor.visit_impl_item(item),
648 MaybeOwner::Owner(OwnerNode::TraitItem(item)) => visitor.visit_trait_item(item),
649 MaybeOwner::Owner(OwnerNode::Crate(_))
650 | MaybeOwner::NonOwner(_)
651 | MaybeOwner::Phantom => {}
655 pub fn visit_item_likes_in_module<V>(self, module: LocalDefId, visitor: &mut V)
657 V: ItemLikeVisitor<'hir>,
659 let module = self.tcx.hir_module_items(module);
661 for id in module.items.iter() {
662 visitor.visit_item(self.item(*id));
665 for id in module.trait_items.iter() {
666 visitor.visit_trait_item(self.trait_item(*id));
669 for id in module.impl_items.iter() {
670 visitor.visit_impl_item(self.impl_item(*id));
673 for id in module.foreign_items.iter() {
674 visitor.visit_foreign_item(self.foreign_item(*id));
678 pub fn for_each_module(self, f: impl Fn(LocalDefId)) {
679 let mut queue = VecDeque::new();
680 queue.push_back(CRATE_DEF_ID);
682 while let Some(id) = queue.pop_front() {
684 let items = self.tcx.hir_module_items(id);
685 queue.extend(items.submodules.iter().copied())
689 #[cfg(not(parallel_compiler))]
691 pub fn par_for_each_module(self, f: impl Fn(LocalDefId)) {
692 self.for_each_module(f)
695 #[cfg(parallel_compiler)]
696 pub fn par_for_each_module(self, f: impl Fn(LocalDefId) + Sync) {
697 use rustc_data_structures::sync::{par_iter, ParallelIterator};
698 par_iter_submodules(self.tcx, CRATE_DEF_ID, &f);
700 fn par_iter_submodules<F>(tcx: TyCtxt<'_>, module: LocalDefId, f: &F)
702 F: Fn(LocalDefId) + Sync,
705 let items = tcx.hir_module_items(module);
706 par_iter(&items.submodules[..]).for_each(|&sm| par_iter_submodules(tcx, sm, f));
710 /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
711 /// until the crate root is reached. Prefer this over your own loop using `get_parent_node`.
712 pub fn parent_iter(self, current_id: HirId) -> ParentHirIterator<'hir> {
713 ParentHirIterator { current_id, map: self }
716 /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
717 /// until the crate root is reached. Prefer this over your own loop using `get_parent_node`.
718 pub fn parent_owner_iter(self, current_id: HirId) -> ParentOwnerIterator<'hir> {
719 ParentOwnerIterator { current_id, map: self }
722 /// Checks if the node is left-hand side of an assignment.
723 pub fn is_lhs(self, id: HirId) -> bool {
724 match self.find(self.get_parent_node(id)) {
725 Some(Node::Expr(expr)) => match expr.kind {
726 ExprKind::Assign(lhs, _rhs, _span) => lhs.hir_id == id,
733 /// Whether the expression pointed at by `hir_id` belongs to a `const` evaluation context.
734 /// Used exclusively for diagnostics, to avoid suggestion function calls.
735 pub fn is_inside_const_context(self, hir_id: HirId) -> bool {
736 self.body_const_context(self.local_def_id(self.enclosing_body_owner(hir_id))).is_some()
739 /// Retrieves the `HirId` for `id`'s enclosing method, unless there's a
740 /// `while` or `loop` before reaching it, as block tail returns are not
741 /// available in them.
744 /// fn foo(x: usize) -> bool {
746 /// true // If `get_return_block` gets passed the `id` corresponding
747 /// } else { // to this, it will return `foo`'s `HirId`.
754 /// fn foo(x: usize) -> bool {
756 /// true // If `get_return_block` gets passed the `id` corresponding
757 /// } // to this, it will return `None`.
761 pub fn get_return_block(self, id: HirId) -> Option<HirId> {
762 let mut iter = self.parent_iter(id).peekable();
763 let mut ignore_tail = false;
764 if let Some(node) = self.find(id) {
765 if let Node::Expr(Expr { kind: ExprKind::Ret(_), .. }) = node {
766 // When dealing with `return` statements, we don't care about climbing only tail
771 while let Some((hir_id, node)) = iter.next() {
772 if let (Some((_, next_node)), false) = (iter.peek(), ignore_tail) {
774 Node::Block(Block { expr: None, .. }) => return None,
775 // The current node is not the tail expression of its parent.
776 Node::Block(Block { expr: Some(e), .. }) if hir_id != e.hir_id => return None,
782 | Node::ForeignItem(_)
784 | Node::Expr(Expr { kind: ExprKind::Closure(..), .. })
785 | Node::ImplItem(_) => return Some(hir_id),
786 // Ignore `return`s on the first iteration
787 Node::Expr(Expr { kind: ExprKind::Loop(..) | ExprKind::Ret(..), .. })
788 | Node::Local(_) => {
797 /// Retrieves the `HirId` for `id`'s parent item, or `id` itself if no
798 /// parent item is in this map. The "parent item" is the closest parent node
799 /// in the HIR which is recorded by the map and is an item, either an item
800 /// in a module, trait, or impl.
801 pub fn get_parent_item(self, hir_id: HirId) -> LocalDefId {
802 if let Some((def_id, _node)) = self.parent_owner_iter(hir_id).next() {
809 /// Returns the `HirId` of `id`'s nearest module parent, or `id` itself if no
810 /// module parent is in this map.
811 pub(super) fn get_module_parent_node(self, hir_id: HirId) -> LocalDefId {
812 for (def_id, node) in self.parent_owner_iter(hir_id) {
813 if let OwnerNode::Item(&Item { kind: ItemKind::Mod(_), .. }) = node {
820 /// When on an if expression, a match arm tail expression or a match arm, give back
821 /// the enclosing `if` or `match` expression.
823 /// Used by error reporting when there's a type error in an if or match arm caused by the
824 /// expression needing to be unit.
825 pub fn get_if_cause(self, hir_id: HirId) -> Option<&'hir Expr<'hir>> {
826 for (_, node) in self.parent_iter(hir_id) {
829 | Node::ForeignItem(_)
832 | Node::Stmt(Stmt { kind: StmtKind::Local(_), .. }) => break,
833 Node::Expr(expr @ Expr { kind: ExprKind::If(..) | ExprKind::Match(..), .. }) => {
842 /// Returns the nearest enclosing scope. A scope is roughly an item or block.
843 pub fn get_enclosing_scope(self, hir_id: HirId) -> Option<HirId> {
844 for (hir_id, node) in self.parent_iter(hir_id) {
845 if let Node::Item(Item {
848 | ItemKind::Const(..)
849 | ItemKind::Static(..)
852 | ItemKind::Struct(..)
853 | ItemKind::Union(..)
854 | ItemKind::Trait(..)
855 | ItemKind::Impl { .. },
858 | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(..), .. })
859 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(..), .. })
860 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(..), .. })
861 | Node::Block(_) = node
869 /// Returns the defining scope for an opaque type definition.
870 pub fn get_defining_scope(self, id: HirId) -> HirId {
873 scope = self.get_enclosing_scope(scope).unwrap_or(CRATE_HIR_ID);
874 if scope == CRATE_HIR_ID || !matches!(self.get(scope), Node::Block(_)) {
880 pub fn get_foreign_abi(self, hir_id: HirId) -> Abi {
881 let parent = self.get_parent_item(hir_id);
882 if let Some(node) = self.tcx.hir_owner(parent) {
883 if let OwnerNode::Item(Item { kind: ItemKind::ForeignMod { abi, .. }, .. }) = node.node
889 "expected foreign mod or inlined parent, found {}",
890 self.node_to_string(HirId::make_owner(parent))
894 pub fn expect_item(self, id: LocalDefId) -> &'hir Item<'hir> {
895 match self.tcx.hir_owner(id) {
896 Some(Owner { node: OwnerNode::Item(item), .. }) => item,
897 _ => bug!("expected item, found {}", self.node_to_string(HirId::make_owner(id))),
901 pub fn expect_impl_item(self, id: LocalDefId) -> &'hir ImplItem<'hir> {
902 match self.tcx.hir_owner(id) {
903 Some(Owner { node: OwnerNode::ImplItem(item), .. }) => item,
904 _ => bug!("expected impl item, found {}", self.node_to_string(HirId::make_owner(id))),
908 pub fn expect_trait_item(self, id: LocalDefId) -> &'hir TraitItem<'hir> {
909 match self.tcx.hir_owner(id) {
910 Some(Owner { node: OwnerNode::TraitItem(item), .. }) => item,
911 _ => bug!("expected trait item, found {}", self.node_to_string(HirId::make_owner(id))),
915 pub fn expect_variant(self, id: HirId) -> &'hir Variant<'hir> {
916 match self.find(id) {
917 Some(Node::Variant(variant)) => variant,
918 _ => bug!("expected variant, found {}", self.node_to_string(id)),
922 pub fn expect_foreign_item(self, id: LocalDefId) -> &'hir ForeignItem<'hir> {
923 match self.tcx.hir_owner(id) {
924 Some(Owner { node: OwnerNode::ForeignItem(item), .. }) => item,
926 bug!("expected foreign item, found {}", self.node_to_string(HirId::make_owner(id)))
931 pub fn expect_expr(self, id: HirId) -> &'hir Expr<'hir> {
932 match self.find(id) {
933 Some(Node::Expr(expr)) => expr,
934 _ => bug!("expected expr, found {}", self.node_to_string(id)),
938 pub fn opt_name(self, id: HirId) -> Option<Symbol> {
939 Some(match self.get(id) {
940 Node::Item(i) => i.ident.name,
941 Node::ForeignItem(fi) => fi.ident.name,
942 Node::ImplItem(ii) => ii.ident.name,
943 Node::TraitItem(ti) => ti.ident.name,
944 Node::Variant(v) => v.ident.name,
945 Node::Field(f) => f.ident.name,
946 Node::Lifetime(lt) => lt.name.ident().name,
947 Node::GenericParam(param) => param.name.ident().name,
948 Node::Binding(&Pat { kind: PatKind::Binding(_, _, l, _), .. }) => l.name,
949 Node::Ctor(..) => self.name(HirId::make_owner(self.get_parent_item(id))),
954 pub fn name(self, id: HirId) -> Symbol {
955 match self.opt_name(id) {
957 None => bug!("no name for {}", self.node_to_string(id)),
961 /// Given a node ID, gets a list of attributes associated with the AST
962 /// corresponding to the node-ID.
963 pub fn attrs(self, id: HirId) -> &'hir [ast::Attribute] {
964 self.tcx.hir_attrs(id.owner).get(id.local_id)
967 /// Gets the span of the definition of the specified HIR node.
968 /// This is used by `tcx.get_span`
969 pub fn span(self, hir_id: HirId) -> Span {
970 self.opt_span(hir_id)
971 .unwrap_or_else(|| bug!("hir::map::Map::span: id not in map: {:?}", hir_id))
974 pub fn opt_span(self, hir_id: HirId) -> Option<Span> {
975 let span = match self.find(hir_id)? {
976 Node::Param(param) => param.span,
977 Node::Item(item) => match &item.kind {
978 ItemKind::Fn(sig, _, _) => sig.span,
981 Node::ForeignItem(foreign_item) => foreign_item.span,
982 Node::TraitItem(trait_item) => match &trait_item.kind {
983 TraitItemKind::Fn(sig, _) => sig.span,
984 _ => trait_item.span,
986 Node::ImplItem(impl_item) => match &impl_item.kind {
987 ImplItemKind::Fn(sig, _) => sig.span,
990 Node::Variant(variant) => variant.span,
991 Node::Field(field) => field.span,
992 Node::AnonConst(constant) => self.body(constant.body).value.span,
993 Node::Expr(expr) => expr.span,
994 Node::Stmt(stmt) => stmt.span,
995 Node::PathSegment(seg) => seg.ident.span,
996 Node::Ty(ty) => ty.span,
997 Node::TraitRef(tr) => tr.path.span,
998 Node::Binding(pat) => pat.span,
999 Node::Pat(pat) => pat.span,
1000 Node::Arm(arm) => arm.span,
1001 Node::Block(block) => block.span,
1002 Node::Ctor(..) => match self.find(self.get_parent_node(hir_id))? {
1003 Node::Item(item) => item.span,
1004 Node::Variant(variant) => variant.span,
1005 _ => unreachable!(),
1007 Node::Lifetime(lifetime) => lifetime.span,
1008 Node::GenericParam(param) => param.span,
1009 Node::Visibility(&Spanned {
1010 node: VisibilityKind::Restricted { ref path, .. },
1013 Node::Infer(i) => i.span,
1014 Node::Visibility(v) => bug!("unexpected Visibility {:?}", v),
1015 Node::Local(local) => local.span,
1016 Node::Crate(item) => item.inner,
1021 /// Like `hir.span()`, but includes the body of function items
1022 /// (instead of just the function header)
1023 pub fn span_with_body(self, hir_id: HirId) -> Span {
1024 match self.find(hir_id) {
1025 Some(Node::TraitItem(item)) => item.span,
1026 Some(Node::ImplItem(impl_item)) => impl_item.span,
1027 Some(Node::Item(item)) => item.span,
1028 Some(_) => self.span(hir_id),
1029 _ => bug!("hir::map::Map::span_with_body: id not in map: {:?}", hir_id),
1033 pub fn span_if_local(self, id: DefId) -> Option<Span> {
1034 id.as_local().and_then(|id| self.opt_span(self.local_def_id_to_hir_id(id)))
1037 pub fn res_span(self, res: Res) -> Option<Span> {
1040 Res::Local(id) => Some(self.span(id)),
1041 res => self.span_if_local(res.opt_def_id()?),
1045 /// Get a representation of this `id` for debugging purposes.
1046 /// NOTE: Do NOT use this in diagnostics!
1047 pub fn node_to_string(self, id: HirId) -> String {
1048 hir_id_to_string(self, id)
1051 /// Returns the HirId of `N` in `struct Foo<const N: usize = { ... }>` when
1052 /// called with the HirId for the `{ ... }` anon const
1053 pub fn opt_const_param_default_param_hir_id(self, anon_const: HirId) -> Option<HirId> {
1054 match self.get(self.get_parent_node(anon_const)) {
1055 Node::GenericParam(GenericParam {
1057 kind: GenericParamKind::Const { .. },
1059 }) => Some(*param_id),
1065 impl<'hir> intravisit::Map<'hir> for Map<'hir> {
1066 fn find(&self, hir_id: HirId) -> Option<Node<'hir>> {
1067 (*self).find(hir_id)
1070 fn body(&self, id: BodyId) -> &'hir Body<'hir> {
1074 fn item(&self, id: ItemId) -> &'hir Item<'hir> {
1078 fn trait_item(&self, id: TraitItemId) -> &'hir TraitItem<'hir> {
1079 (*self).trait_item(id)
1082 fn impl_item(&self, id: ImplItemId) -> &'hir ImplItem<'hir> {
1083 (*self).impl_item(id)
1086 fn foreign_item(&self, id: ForeignItemId) -> &'hir ForeignItem<'hir> {
1087 (*self).foreign_item(id)
1091 pub(super) fn crate_hash(tcx: TyCtxt<'_>, crate_num: CrateNum) -> Svh {
1092 debug_assert_eq!(crate_num, LOCAL_CRATE);
1093 let krate = tcx.hir_crate(());
1094 let hir_body_hash = krate.hir_hash;
1096 let upstream_crates = upstream_crates(tcx);
1098 // We hash the final, remapped names of all local source files so we
1099 // don't have to include the path prefix remapping commandline args.
1100 // If we included the full mapping in the SVH, we could only have
1101 // reproducible builds by compiling from the same directory. So we just
1102 // hash the result of the mapping instead of the mapping itself.
1103 let mut source_file_names: Vec<_> = tcx
1108 .filter(|source_file| source_file.cnum == LOCAL_CRATE)
1109 .map(|source_file| source_file.name_hash)
1112 source_file_names.sort_unstable();
1114 let mut hcx = tcx.create_stable_hashing_context();
1115 let mut stable_hasher = StableHasher::new();
1116 hir_body_hash.hash_stable(&mut hcx, &mut stable_hasher);
1117 upstream_crates.hash_stable(&mut hcx, &mut stable_hasher);
1118 source_file_names.hash_stable(&mut hcx, &mut stable_hasher);
1119 if tcx.sess.opts.debugging_opts.incremental_relative_spans {
1120 let definitions = &tcx.untracked_resolutions.definitions;
1121 let mut owner_spans: Vec<_> = krate
1124 .filter_map(|(def_id, info)| {
1125 let _ = info.as_owner()?;
1126 let def_path_hash = definitions.def_path_hash(def_id);
1127 let span = definitions.def_span(def_id);
1128 debug_assert_eq!(span.parent(), None);
1129 Some((def_path_hash, span))
1132 owner_spans.sort_unstable_by_key(|bn| bn.0);
1133 owner_spans.hash_stable(&mut hcx, &mut stable_hasher);
1135 tcx.sess.opts.dep_tracking_hash(true).hash_stable(&mut hcx, &mut stable_hasher);
1136 tcx.sess.local_stable_crate_id().hash_stable(&mut hcx, &mut stable_hasher);
1138 let crate_hash: Fingerprint = stable_hasher.finish();
1139 Svh::new(crate_hash.to_smaller_hash())
1142 fn upstream_crates(tcx: TyCtxt<'_>) -> Vec<(StableCrateId, Svh)> {
1143 let mut upstream_crates: Vec<_> = tcx
1147 let stable_crate_id = tcx.resolutions(()).cstore.stable_crate_id(cnum);
1148 let hash = tcx.crate_hash(cnum);
1149 (stable_crate_id, hash)
1152 upstream_crates.sort_unstable_by_key(|&(stable_crate_id, _)| stable_crate_id);
1156 fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
1157 let id_str = format!(" (hir_id={})", id);
1160 // This functionality is used for debugging, try to use `TyCtxt` to get
1161 // the user-friendly path, otherwise fall back to stringifying `DefPath`.
1162 crate::ty::tls::with_opt(|tcx| {
1163 if let Some(tcx) = tcx {
1164 let def_id = map.local_def_id(id);
1165 tcx.def_path_str(def_id.to_def_id())
1166 } else if let Some(path) = map.def_path_from_hir_id(id) {
1167 path.data.into_iter().map(|elem| elem.to_string()).collect::<Vec<_>>().join("::")
1169 String::from("<missing path>")
1174 let span_str = || map.tcx.sess.source_map().span_to_snippet(map.span(id)).unwrap_or_default();
1175 let node_str = |prefix| format!("{} {}{}", prefix, span_str(), id_str);
1177 match map.find(id) {
1178 Some(Node::Item(item)) => {
1179 let item_str = match item.kind {
1180 ItemKind::ExternCrate(..) => "extern crate",
1181 ItemKind::Use(..) => "use",
1182 ItemKind::Static(..) => "static",
1183 ItemKind::Const(..) => "const",
1184 ItemKind::Fn(..) => "fn",
1185 ItemKind::Macro(..) => "macro",
1186 ItemKind::Mod(..) => "mod",
1187 ItemKind::ForeignMod { .. } => "foreign mod",
1188 ItemKind::GlobalAsm(..) => "global asm",
1189 ItemKind::TyAlias(..) => "ty",
1190 ItemKind::OpaqueTy(..) => "opaque type",
1191 ItemKind::Enum(..) => "enum",
1192 ItemKind::Struct(..) => "struct",
1193 ItemKind::Union(..) => "union",
1194 ItemKind::Trait(..) => "trait",
1195 ItemKind::TraitAlias(..) => "trait alias",
1196 ItemKind::Impl { .. } => "impl",
1198 format!("{} {}{}", item_str, path_str(), id_str)
1200 Some(Node::ForeignItem(_)) => format!("foreign item {}{}", path_str(), id_str),
1201 Some(Node::ImplItem(ii)) => match ii.kind {
1202 ImplItemKind::Const(..) => {
1203 format!("assoc const {} in {}{}", ii.ident, path_str(), id_str)
1205 ImplItemKind::Fn(..) => format!("method {} in {}{}", ii.ident, path_str(), id_str),
1206 ImplItemKind::TyAlias(_) => {
1207 format!("assoc type {} in {}{}", ii.ident, path_str(), id_str)
1210 Some(Node::TraitItem(ti)) => {
1211 let kind = match ti.kind {
1212 TraitItemKind::Const(..) => "assoc constant",
1213 TraitItemKind::Fn(..) => "trait method",
1214 TraitItemKind::Type(..) => "assoc type",
1217 format!("{} {} in {}{}", kind, ti.ident, path_str(), id_str)
1219 Some(Node::Variant(ref variant)) => {
1220 format!("variant {} in {}{}", variant.ident, path_str(), id_str)
1222 Some(Node::Field(ref field)) => {
1223 format!("field {} in {}{}", field.ident, path_str(), id_str)
1225 Some(Node::AnonConst(_)) => node_str("const"),
1226 Some(Node::Expr(_)) => node_str("expr"),
1227 Some(Node::Stmt(_)) => node_str("stmt"),
1228 Some(Node::PathSegment(_)) => node_str("path segment"),
1229 Some(Node::Ty(_)) => node_str("type"),
1230 Some(Node::TraitRef(_)) => node_str("trait ref"),
1231 Some(Node::Binding(_)) => node_str("local"),
1232 Some(Node::Pat(_)) => node_str("pat"),
1233 Some(Node::Param(_)) => node_str("param"),
1234 Some(Node::Arm(_)) => node_str("arm"),
1235 Some(Node::Block(_)) => node_str("block"),
1236 Some(Node::Infer(_)) => node_str("infer"),
1237 Some(Node::Local(_)) => node_str("local"),
1238 Some(Node::Ctor(..)) => format!("ctor {}{}", path_str(), id_str),
1239 Some(Node::Lifetime(_)) => node_str("lifetime"),
1240 Some(Node::GenericParam(ref param)) => format!("generic_param {:?}{}", param, id_str),
1241 Some(Node::Visibility(ref vis)) => format!("visibility {:?}{}", vis, id_str),
1242 Some(Node::Crate(..)) => String::from("root_crate"),
1243 None => format!("unknown node{}", id_str),
1247 pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalDefId) -> ModuleItems {
1248 let mut collector = ModuleCollector {
1250 submodules: Vec::default(),
1251 items: Vec::default(),
1252 trait_items: Vec::default(),
1253 impl_items: Vec::default(),
1254 foreign_items: Vec::default(),
1257 let (hir_mod, span, hir_id) = tcx.hir().get_module(module_id);
1258 collector.visit_mod(hir_mod, span, hir_id);
1260 let ModuleCollector { submodules, items, trait_items, impl_items, foreign_items, .. } =
1262 return ModuleItems {
1263 submodules: submodules.into_boxed_slice(),
1264 items: items.into_boxed_slice(),
1265 trait_items: trait_items.into_boxed_slice(),
1266 impl_items: impl_items.into_boxed_slice(),
1267 foreign_items: foreign_items.into_boxed_slice(),
1270 struct ModuleCollector<'tcx> {
1272 submodules: Vec<LocalDefId>,
1274 trait_items: Vec<TraitItemId>,
1275 impl_items: Vec<ImplItemId>,
1276 foreign_items: Vec<ForeignItemId>,
1279 impl<'hir> Visitor<'hir> for ModuleCollector<'hir> {
1280 type NestedFilter = nested_filter::All;
1282 fn nested_visit_map(&mut self) -> Self::Map {
1286 fn visit_item(&mut self, item: &'hir Item<'hir>) {
1287 self.items.push(item.item_id());
1288 if let ItemKind::Mod(..) = item.kind {
1289 // If this declares another module, do not recurse inside it.
1290 self.submodules.push(item.def_id);
1292 intravisit::walk_item(self, item)
1296 fn visit_trait_item(&mut self, item: &'hir TraitItem<'hir>) {
1297 self.trait_items.push(item.trait_item_id());
1298 intravisit::walk_trait_item(self, item)
1301 fn visit_impl_item(&mut self, item: &'hir ImplItem<'hir>) {
1302 self.impl_items.push(item.impl_item_id());
1303 intravisit::walk_impl_item(self, item)
1306 fn visit_foreign_item(&mut self, item: &'hir ForeignItem<'hir>) {
1307 self.foreign_items.push(item.foreign_item_id());
1308 intravisit::walk_foreign_item(self, item)