1 use crate::hir::{ModuleItems, Owner};
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_span::def_id::StableCrateId;
16 use rustc_span::hygiene::MacroKind;
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;
25 fn fn_decl<'hir>(node: Node<'hir>) -> Option<&'hir FnDecl<'hir>> {
27 Node::Item(Item { kind: ItemKind::Fn(sig, _, _), .. })
28 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, _), .. })
29 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, _), .. }) => Some(&sig.decl),
30 Node::Expr(Expr { kind: ExprKind::Closure(_, fn_decl, ..), .. })
31 | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(fn_decl, ..), .. }) => {
38 pub fn fn_sig<'hir>(node: Node<'hir>) -> Option<&'hir FnSig<'hir>> {
40 Node::Item(Item { kind: ItemKind::Fn(sig, _, _), .. })
41 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, _), .. })
42 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, _), .. }) => Some(sig),
47 pub fn associated_body<'hir>(node: Node<'hir>) -> Option<BodyId> {
50 kind: ItemKind::Const(_, body) | ItemKind::Static(.., body) | ItemKind::Fn(.., body),
53 | Node::TraitItem(TraitItem {
55 TraitItemKind::Const(_, Some(body)) | TraitItemKind::Fn(_, TraitFn::Provided(body)),
58 | Node::ImplItem(ImplItem {
59 kind: ImplItemKind::Const(_, body) | ImplItemKind::Fn(_, body),
62 | Node::Expr(Expr { kind: ExprKind::Closure(.., body, _, _), .. }) => Some(*body),
64 Node::AnonConst(constant) => Some(constant.body),
70 fn is_body_owner<'hir>(node: Node<'hir>, hir_id: HirId) -> bool {
71 match associated_body(node) {
72 Some(b) => b.hir_id == hir_id,
77 #[derive(Copy, Clone)]
78 pub struct Map<'hir> {
79 pub(super) tcx: TyCtxt<'hir>,
82 /// An iterator that walks up the ancestor tree of a given `HirId`.
83 /// Constructed using `tcx.hir().parent_iter(hir_id)`.
84 pub struct ParentHirIterator<'hir> {
89 impl<'hir> Iterator for ParentHirIterator<'hir> {
90 type Item = (HirId, Node<'hir>);
92 fn next(&mut self) -> Option<Self::Item> {
93 if self.current_id == CRATE_HIR_ID {
97 // There are nodes that do not have entries, so we need to skip them.
98 let parent_id = self.map.get_parent_node(self.current_id);
100 if parent_id == self.current_id {
101 self.current_id = CRATE_HIR_ID;
105 self.current_id = parent_id;
106 if let Some(node) = self.map.find(parent_id) {
107 return Some((parent_id, node));
109 // If this `HirId` doesn't have an entry, skip it and look for its `parent_id`.
114 /// An iterator that walks up the ancestor tree of a given `HirId`.
115 /// Constructed using `tcx.hir().parent_owner_iter(hir_id)`.
116 pub struct ParentOwnerIterator<'hir> {
121 impl<'hir> Iterator for ParentOwnerIterator<'hir> {
122 type Item = (HirId, OwnerNode<'hir>);
124 fn next(&mut self) -> Option<Self::Item> {
125 if self.current_id.local_id.index() != 0 {
126 self.current_id.local_id = ItemLocalId::new(0);
127 if let Some(node) = self.map.tcx.hir_owner(self.current_id.owner) {
128 return Some((self.current_id, node.node));
131 if self.current_id == CRATE_HIR_ID {
135 // There are nodes that do not have entries, so we need to skip them.
136 let parent_id = self.map.def_key(self.current_id.owner).parent;
138 let parent_id = parent_id.map_or(CRATE_HIR_ID.owner, |local_def_index| {
139 let def_id = LocalDefId { local_def_index };
140 self.map.local_def_id_to_hir_id(def_id).owner
142 self.current_id = HirId::make_owner(parent_id);
144 // If this `HirId` doesn't have an entry, skip it and look for its `parent_id`.
145 if let Some(node) = self.map.tcx.hir_owner(self.current_id.owner) {
146 return Some((self.current_id, node.node));
152 impl<'hir> Map<'hir> {
153 pub fn krate(&self) -> &'hir Crate<'hir> {
154 self.tcx.hir_crate(())
157 pub fn root_module(&self) -> &'hir Mod<'hir> {
158 match self.tcx.hir_owner(CRATE_DEF_ID).map(|o| o.node) {
159 Some(OwnerNode::Crate(item)) => item,
164 pub fn items(&self) -> impl Iterator<Item = &'hir Item<'hir>> + 'hir {
165 let krate = self.krate();
166 krate.owners.iter().filter_map(|owner| match owner.as_ref()?.node() {
167 OwnerNode::Item(item) => Some(item),
172 pub fn def_key(&self, def_id: LocalDefId) -> DefKey {
173 // Accessing the DefKey is ok, since it is part of DefPathHash.
174 self.tcx.untracked_resolutions.definitions.def_key(def_id)
177 pub fn def_path_from_hir_id(&self, id: HirId) -> Option<DefPath> {
178 self.opt_local_def_id(id).map(|def_id| self.def_path(def_id))
181 pub fn def_path(&self, def_id: LocalDefId) -> DefPath {
182 // Accessing the DefPath is ok, since it is part of DefPathHash.
183 self.tcx.untracked_resolutions.definitions.def_path(def_id)
187 pub fn def_path_hash(self, def_id: LocalDefId) -> DefPathHash {
188 // Accessing the DefPathHash is ok, it is incr. comp. stable.
189 self.tcx.untracked_resolutions.definitions.def_path_hash(def_id)
193 pub fn local_def_id(&self, hir_id: HirId) -> LocalDefId {
194 self.opt_local_def_id(hir_id).unwrap_or_else(|| {
196 "local_def_id: no entry for `{:?}`, which has a map of `{:?}`",
204 pub fn opt_local_def_id(&self, hir_id: HirId) -> Option<LocalDefId> {
205 // FIXME(#85914) is this access safe for incr. comp.?
206 self.tcx.untracked_resolutions.definitions.opt_hir_id_to_local_def_id(hir_id)
210 pub fn local_def_id_to_hir_id(&self, def_id: LocalDefId) -> HirId {
211 // FIXME(#85914) is this access safe for incr. comp.?
212 self.tcx.untracked_resolutions.definitions.local_def_id_to_hir_id(def_id)
215 pub fn iter_local_def_id(&self) -> impl Iterator<Item = LocalDefId> + '_ {
216 // Create a dependency to the crate to be sure we reexcute this when the amount of
217 // definitions change.
218 self.tcx.ensure().hir_crate(());
219 self.tcx.untracked_resolutions.definitions.iter_local_def_id()
222 pub fn opt_def_kind(&self, local_def_id: LocalDefId) -> Option<DefKind> {
223 let hir_id = self.local_def_id_to_hir_id(local_def_id);
224 let def_kind = match self.find(hir_id)? {
225 Node::Item(item) => match item.kind {
226 ItemKind::Static(..) => DefKind::Static,
227 ItemKind::Const(..) => DefKind::Const,
228 ItemKind::Fn(..) => DefKind::Fn,
229 ItemKind::Macro(..) => DefKind::Macro(MacroKind::Bang),
230 ItemKind::Mod(..) => DefKind::Mod,
231 ItemKind::OpaqueTy(..) => DefKind::OpaqueTy,
232 ItemKind::TyAlias(..) => DefKind::TyAlias,
233 ItemKind::Enum(..) => DefKind::Enum,
234 ItemKind::Struct(..) => DefKind::Struct,
235 ItemKind::Union(..) => DefKind::Union,
236 ItemKind::Trait(..) => DefKind::Trait,
237 ItemKind::TraitAlias(..) => DefKind::TraitAlias,
238 ItemKind::ExternCrate(_) => DefKind::ExternCrate,
239 ItemKind::Use(..) => DefKind::Use,
240 ItemKind::ForeignMod { .. } => DefKind::ForeignMod,
241 ItemKind::GlobalAsm(..) => DefKind::GlobalAsm,
242 ItemKind::Impl { .. } => DefKind::Impl,
244 Node::ForeignItem(item) => match item.kind {
245 ForeignItemKind::Fn(..) => DefKind::Fn,
246 ForeignItemKind::Static(..) => DefKind::Static,
247 ForeignItemKind::Type => DefKind::ForeignTy,
249 Node::TraitItem(item) => match item.kind {
250 TraitItemKind::Const(..) => DefKind::AssocConst,
251 TraitItemKind::Fn(..) => DefKind::AssocFn,
252 TraitItemKind::Type(..) => DefKind::AssocTy,
254 Node::ImplItem(item) => match item.kind {
255 ImplItemKind::Const(..) => DefKind::AssocConst,
256 ImplItemKind::Fn(..) => DefKind::AssocFn,
257 ImplItemKind::TyAlias(..) => DefKind::AssocTy,
259 Node::Variant(_) => DefKind::Variant,
260 Node::Ctor(variant_data) => {
261 // FIXME(eddyb) is this even possible, if we have a `Node::Ctor`?
262 assert_ne!(variant_data.ctor_hir_id(), None);
264 let ctor_of = match self.find(self.get_parent_node(hir_id)) {
265 Some(Node::Item(..)) => def::CtorOf::Struct,
266 Some(Node::Variant(..)) => def::CtorOf::Variant,
269 DefKind::Ctor(ctor_of, def::CtorKind::from_hir(variant_data))
271 Node::AnonConst(_) => DefKind::AnonConst,
272 Node::Field(_) => DefKind::Field,
273 Node::Expr(expr) => match expr.kind {
274 ExprKind::Closure(.., None) => DefKind::Closure,
275 ExprKind::Closure(.., Some(_)) => DefKind::Generator,
276 _ => bug!("def_kind: unsupported node: {}", self.node_to_string(hir_id)),
278 Node::GenericParam(param) => match param.kind {
279 GenericParamKind::Lifetime { .. } => DefKind::LifetimeParam,
280 GenericParamKind::Type { .. } => DefKind::TyParam,
281 GenericParamKind::Const { .. } => DefKind::ConstParam,
283 Node::Crate(_) => DefKind::Mod,
285 | Node::PathSegment(_)
295 | Node::Visibility(_)
296 | Node::Block(_) => return None,
301 pub fn def_kind(&self, local_def_id: LocalDefId) -> DefKind {
302 self.opt_def_kind(local_def_id)
303 .unwrap_or_else(|| bug!("def_kind: unsupported node: {:?}", local_def_id))
306 pub fn find_parent_node(&self, id: HirId) -> Option<HirId> {
307 if id.local_id == ItemLocalId::from_u32(0) {
308 Some(self.tcx.hir_owner_parent(id.owner))
310 let owner = self.tcx.hir_owner_nodes(id.owner)?;
311 let node = owner.nodes[id.local_id].as_ref()?;
312 let hir_id = HirId { owner: id.owner, local_id: node.parent };
317 pub fn get_parent_node(&self, hir_id: HirId) -> HirId {
318 self.find_parent_node(hir_id).unwrap()
321 /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found.
322 pub fn find(&self, id: HirId) -> Option<Node<'hir>> {
323 if id.local_id == ItemLocalId::from_u32(0) {
324 let owner = self.tcx.hir_owner(id.owner)?;
325 Some(owner.node.into())
327 let owner = self.tcx.hir_owner_nodes(id.owner)?;
328 let node = owner.nodes[id.local_id].as_ref()?;
333 /// Retrieves the `Node` corresponding to `id`, panicking if it cannot be found.
334 pub fn get(&self, id: HirId) -> Node<'hir> {
335 self.find(id).unwrap_or_else(|| bug!("couldn't find hir id {} in the HIR map", id))
338 pub fn get_if_local(&self, id: DefId) -> Option<Node<'hir>> {
339 id.as_local().and_then(|id| self.find(self.local_def_id_to_hir_id(id)))
342 pub fn get_generics(&self, id: DefId) -> Option<&'hir Generics<'hir>> {
343 let id = id.as_local()?;
344 let node = self.tcx.hir_owner(id)?;
346 OwnerNode::ImplItem(impl_item) => Some(&impl_item.generics),
347 OwnerNode::TraitItem(trait_item) => Some(&trait_item.generics),
348 OwnerNode::Item(Item {
350 ItemKind::Fn(_, generics, _)
351 | ItemKind::TyAlias(_, generics)
352 | ItemKind::Enum(_, generics)
353 | ItemKind::Struct(_, generics)
354 | ItemKind::Union(_, generics)
355 | ItemKind::Trait(_, _, generics, ..)
356 | ItemKind::TraitAlias(generics, _)
357 | ItemKind::Impl(Impl { generics, .. }),
359 }) => Some(generics),
364 pub fn item(&self, id: ItemId) -> &'hir Item<'hir> {
365 self.tcx.hir_owner(id.def_id).unwrap().node.expect_item()
368 pub fn trait_item(&self, id: TraitItemId) -> &'hir TraitItem<'hir> {
369 self.tcx.hir_owner(id.def_id).unwrap().node.expect_trait_item()
372 pub fn impl_item(&self, id: ImplItemId) -> &'hir ImplItem<'hir> {
373 self.tcx.hir_owner(id.def_id).unwrap().node.expect_impl_item()
376 pub fn foreign_item(&self, id: ForeignItemId) -> &'hir ForeignItem<'hir> {
377 self.tcx.hir_owner(id.def_id).unwrap().node.expect_foreign_item()
380 pub fn body(&self, id: BodyId) -> &'hir Body<'hir> {
381 self.tcx.hir_owner_nodes(id.hir_id.owner).unwrap().bodies[id.hir_id.local_id].unwrap()
384 pub fn fn_decl_by_hir_id(&self, hir_id: HirId) -> Option<&'hir FnDecl<'hir>> {
385 if let Some(node) = self.find(hir_id) {
388 bug!("no node for hir_id `{}`", hir_id)
392 pub fn fn_sig_by_hir_id(&self, hir_id: HirId) -> Option<&'hir FnSig<'hir>> {
393 if let Some(node) = self.find(hir_id) {
396 bug!("no node for hir_id `{}`", hir_id)
400 pub fn enclosing_body_owner(&self, hir_id: HirId) -> HirId {
401 for (parent, _) in self.parent_iter(hir_id) {
402 if let Some(body) = self.maybe_body_owned_by(parent) {
403 return self.body_owner(body);
407 bug!("no `enclosing_body_owner` for hir_id `{}`", hir_id);
410 /// Returns the `HirId` that corresponds to the definition of
411 /// which this is the body of, i.e., a `fn`, `const` or `static`
412 /// item (possibly associated), a closure, or a `hir::AnonConst`.
413 pub fn body_owner(&self, BodyId { hir_id }: BodyId) -> HirId {
414 let parent = self.get_parent_node(hir_id);
415 assert!(self.find(parent).map_or(false, |n| is_body_owner(n, hir_id)));
419 pub fn body_owner_def_id(&self, id: BodyId) -> LocalDefId {
420 self.local_def_id(self.body_owner(id))
423 /// Given a `HirId`, returns the `BodyId` associated with it,
424 /// if the node is a body owner, otherwise returns `None`.
425 pub fn maybe_body_owned_by(&self, hir_id: HirId) -> Option<BodyId> {
426 self.find(hir_id).map(associated_body).flatten()
429 /// Given a body owner's id, returns the `BodyId` associated with it.
430 pub fn body_owned_by(&self, id: HirId) -> BodyId {
431 self.maybe_body_owned_by(id).unwrap_or_else(|| {
434 "body_owned_by: {} has no associated body",
435 self.node_to_string(id)
440 pub fn body_param_names(&self, id: BodyId) -> impl Iterator<Item = Ident> + 'hir {
441 self.body(id).params.iter().map(|arg| match arg.pat.kind {
442 PatKind::Binding(_, _, ident, _) => ident,
443 _ => Ident::new(kw::Empty, rustc_span::DUMMY_SP),
447 /// Returns the `BodyOwnerKind` of this `LocalDefId`.
449 /// Panics if `LocalDefId` does not have an associated body.
450 pub fn body_owner_kind(&self, id: HirId) -> BodyOwnerKind {
452 Node::Item(&Item { kind: ItemKind::Const(..), .. })
453 | Node::TraitItem(&TraitItem { kind: TraitItemKind::Const(..), .. })
454 | Node::ImplItem(&ImplItem { kind: ImplItemKind::Const(..), .. })
455 | Node::AnonConst(_) => BodyOwnerKind::Const,
457 | Node::Item(&Item { kind: ItemKind::Fn(..), .. })
458 | Node::TraitItem(&TraitItem { kind: TraitItemKind::Fn(..), .. })
459 | Node::ImplItem(&ImplItem { kind: ImplItemKind::Fn(..), .. }) => BodyOwnerKind::Fn,
460 Node::Item(&Item { kind: ItemKind::Static(_, m, _), .. }) => BodyOwnerKind::Static(m),
461 Node::Expr(&Expr { kind: ExprKind::Closure(..), .. }) => BodyOwnerKind::Closure,
462 node => bug!("{:#?} is not a body node", node),
466 /// Returns the `ConstContext` of the body associated with this `LocalDefId`.
468 /// Panics if `LocalDefId` does not have an associated body.
470 /// This should only be used for determining the context of a body, a return
471 /// value of `Some` does not always suggest that the owner of the body is `const`.
472 pub fn body_const_context(&self, did: LocalDefId) -> Option<ConstContext> {
473 let hir_id = self.local_def_id_to_hir_id(did);
474 let ccx = match self.body_owner_kind(hir_id) {
475 BodyOwnerKind::Const => ConstContext::Const,
476 BodyOwnerKind::Static(mt) => ConstContext::Static(mt),
478 BodyOwnerKind::Fn if self.tcx.is_constructor(did.to_def_id()) => return None,
479 BodyOwnerKind::Fn if self.tcx.is_const_fn_raw(did.to_def_id()) => ConstContext::ConstFn,
481 if self.tcx.has_attr(did.to_def_id(), sym::default_method_body_is_const) =>
483 ConstContext::ConstFn
485 BodyOwnerKind::Fn | BodyOwnerKind::Closure => return None,
491 /// Returns an iterator of the `DefId`s for all body-owners in this
492 /// crate. If you would prefer to iterate over the bodies
493 /// themselves, you can do `self.hir().krate().body_ids.iter()`.
494 pub fn body_owners(self) -> impl Iterator<Item = LocalDefId> + 'hir {
498 .flat_map(move |(owner, owner_info)| {
499 let bodies = &owner_info.as_ref()?.nodes.bodies;
500 Some(bodies.iter_enumerated().filter_map(move |(local_id, body)| {
504 let hir_id = HirId { owner, local_id };
505 let body_id = BodyId { hir_id };
506 Some(self.body_owner_def_id(body_id))
512 pub fn par_body_owners<F: Fn(LocalDefId) + Sync + Send>(self, f: F) {
513 use rustc_data_structures::sync::{par_iter, ParallelIterator};
514 #[cfg(parallel_compiler)]
515 use rustc_rayon::iter::IndexedParallelIterator;
517 par_iter(&self.krate().owners.raw).enumerate().for_each(|(owner, owner_info)| {
518 let owner = LocalDefId::new(owner);
519 if let Some(owner_info) = owner_info {
520 par_iter(&owner_info.nodes.bodies.raw).enumerate().for_each(|(local_id, body)| {
522 let local_id = ItemLocalId::new(local_id);
523 let hir_id = HirId { owner, local_id };
524 let body_id = BodyId { hir_id };
525 f(self.body_owner_def_id(body_id))
532 pub fn ty_param_owner(&self, id: HirId) -> HirId {
534 Node::Item(&Item { kind: ItemKind::Trait(..) | ItemKind::TraitAlias(..), .. }) => id,
535 Node::GenericParam(_) => self.get_parent_node(id),
536 _ => bug!("ty_param_owner: {} not a type parameter", self.node_to_string(id)),
540 pub fn ty_param_name(&self, id: HirId) -> Symbol {
542 Node::Item(&Item { kind: ItemKind::Trait(..) | ItemKind::TraitAlias(..), .. }) => {
545 Node::GenericParam(param) => param.name.ident().name,
546 _ => bug!("ty_param_name: {} not a type parameter", self.node_to_string(id)),
550 pub fn trait_impls(&self, trait_did: DefId) -> &'hir [LocalDefId] {
551 self.tcx.all_local_trait_impls(()).get(&trait_did).map_or(&[], |xs| &xs[..])
554 /// Gets the attributes on the crate. This is preferable to
555 /// invoking `krate.attrs` because it registers a tighter
556 /// dep-graph access.
557 pub fn krate_attrs(&self) -> &'hir [ast::Attribute] {
558 self.attrs(CRATE_HIR_ID)
561 pub fn get_module(&self, module: LocalDefId) -> (&'hir Mod<'hir>, Span, HirId) {
562 let hir_id = HirId::make_owner(module);
563 match self.tcx.hir_owner(module).map(|o| o.node) {
564 Some(OwnerNode::Item(&Item { span, kind: ItemKind::Mod(ref m), .. })) => {
567 Some(OwnerNode::Crate(item)) => (item, item.inner, hir_id),
568 node => panic!("not a module: {:?}", node),
572 /// Walks the contents of a crate. See also `Crate::visit_all_items`.
573 pub fn walk_toplevel_module(self, visitor: &mut impl Visitor<'hir>) {
574 let (top_mod, span, hir_id) = self.get_module(CRATE_DEF_ID);
575 visitor.visit_mod(top_mod, span, hir_id);
578 /// Walks the attributes in a crate.
579 pub fn walk_attributes(self, visitor: &mut impl Visitor<'hir>) {
580 let krate = self.krate();
581 for (owner, info) in krate.owners.iter_enumerated() {
582 if let Some(info) = info {
583 for (&local_id, attrs) in info.attrs.map.iter() {
584 let id = HirId { owner, local_id };
586 visitor.visit_attribute(id, a)
593 /// Visits all items in the crate in some deterministic (but
594 /// unspecified) order. If you just need to process every item,
595 /// but don't care about nesting, this method is the best choice.
597 /// If you do care about nesting -- usually because your algorithm
598 /// follows lexical scoping rules -- then you want a different
599 /// approach. You should override `visit_nested_item` in your
600 /// visitor and then call `intravisit::walk_crate` instead.
601 pub fn visit_all_item_likes<V>(&self, visitor: &mut V)
603 V: itemlikevisit::ItemLikeVisitor<'hir>,
605 let krate = self.krate();
606 for owner in krate.owners.iter().filter_map(Option::as_ref) {
608 OwnerNode::Item(item) => visitor.visit_item(item),
609 OwnerNode::ForeignItem(item) => visitor.visit_foreign_item(item),
610 OwnerNode::ImplItem(item) => visitor.visit_impl_item(item),
611 OwnerNode::TraitItem(item) => visitor.visit_trait_item(item),
612 OwnerNode::Crate(_) => {}
617 /// A parallel version of `visit_all_item_likes`.
618 pub fn par_visit_all_item_likes<V>(&self, visitor: &V)
620 V: itemlikevisit::ParItemLikeVisitor<'hir> + Sync + Send,
622 let krate = self.krate();
623 par_for_each_in(&krate.owners.raw, |owner| match owner.as_ref().map(OwnerInfo::node) {
624 Some(OwnerNode::Item(item)) => visitor.visit_item(item),
625 Some(OwnerNode::ForeignItem(item)) => visitor.visit_foreign_item(item),
626 Some(OwnerNode::ImplItem(item)) => visitor.visit_impl_item(item),
627 Some(OwnerNode::TraitItem(item)) => visitor.visit_trait_item(item),
628 Some(OwnerNode::Crate(_)) | None => {}
632 pub fn visit_item_likes_in_module<V>(&self, module: LocalDefId, visitor: &mut V)
634 V: ItemLikeVisitor<'hir>,
636 let module = self.tcx.hir_module_items(module);
638 for id in module.items.iter() {
639 visitor.visit_item(self.item(*id));
642 for id in module.trait_items.iter() {
643 visitor.visit_trait_item(self.trait_item(*id));
646 for id in module.impl_items.iter() {
647 visitor.visit_impl_item(self.impl_item(*id));
650 for id in module.foreign_items.iter() {
651 visitor.visit_foreign_item(self.foreign_item(*id));
655 pub fn for_each_module(&self, f: impl Fn(LocalDefId)) {
656 let mut queue = VecDeque::new();
657 queue.push_back(CRATE_DEF_ID);
659 while let Some(id) = queue.pop_front() {
661 let items = self.tcx.hir_module_items(id);
662 queue.extend(items.submodules.iter().copied())
666 #[cfg(not(parallel_compiler))]
668 pub fn par_for_each_module(&self, f: impl Fn(LocalDefId)) {
669 self.for_each_module(f)
672 #[cfg(parallel_compiler)]
673 pub fn par_for_each_module(&self, f: impl Fn(LocalDefId) + Sync) {
674 use rustc_data_structures::sync::{par_iter, ParallelIterator};
675 par_iter_submodules(self.tcx, CRATE_DEF_ID, &f);
677 fn par_iter_submodules<F>(tcx: TyCtxt<'_>, module: LocalDefId, f: &F)
679 F: Fn(LocalDefId) + Sync,
682 let items = tcx.hir_module_items(module);
683 par_iter(&items.submodules[..]).for_each(|&sm| par_iter_submodules(tcx, sm, f));
687 /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
688 /// until the crate root is reached. Prefer this over your own loop using `get_parent_node`.
689 pub fn parent_iter(self, current_id: HirId) -> ParentHirIterator<'hir> {
690 ParentHirIterator { current_id, map: self }
693 /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
694 /// until the crate root is reached. Prefer this over your own loop using `get_parent_node`.
695 pub fn parent_owner_iter(self, current_id: HirId) -> ParentOwnerIterator<'hir> {
696 ParentOwnerIterator { current_id, map: self }
699 /// Checks if the node is left-hand side of an assignment.
700 pub fn is_lhs(&self, id: HirId) -> bool {
701 match self.find(self.get_parent_node(id)) {
702 Some(Node::Expr(expr)) => match expr.kind {
703 ExprKind::Assign(lhs, _rhs, _span) => lhs.hir_id == id,
710 /// Whether the expression pointed at by `hir_id` belongs to a `const` evaluation context.
711 /// Used exclusively for diagnostics, to avoid suggestion function calls.
712 pub fn is_inside_const_context(&self, hir_id: HirId) -> bool {
713 self.body_const_context(self.local_def_id(self.enclosing_body_owner(hir_id))).is_some()
716 /// Retrieves the `HirId` for `id`'s enclosing method, unless there's a
717 /// `while` or `loop` before reaching it, as block tail returns are not
718 /// available in them.
721 /// fn foo(x: usize) -> bool {
723 /// true // If `get_return_block` gets passed the `id` corresponding
724 /// } else { // to this, it will return `foo`'s `HirId`.
731 /// fn foo(x: usize) -> bool {
733 /// true // If `get_return_block` gets passed the `id` corresponding
734 /// } // to this, it will return `None`.
738 pub fn get_return_block(&self, id: HirId) -> Option<HirId> {
739 let mut iter = self.parent_iter(id).peekable();
740 let mut ignore_tail = false;
741 if let Some(node) = self.find(id) {
742 if let Node::Expr(Expr { kind: ExprKind::Ret(_), .. }) = node {
743 // When dealing with `return` statements, we don't care about climbing only tail
748 while let Some((hir_id, node)) = iter.next() {
749 if let (Some((_, next_node)), false) = (iter.peek(), ignore_tail) {
751 Node::Block(Block { expr: None, .. }) => return None,
752 // The current node is not the tail expression of its parent.
753 Node::Block(Block { expr: Some(e), .. }) if hir_id != e.hir_id => return None,
759 | Node::ForeignItem(_)
761 | Node::Expr(Expr { kind: ExprKind::Closure(..), .. })
762 | Node::ImplItem(_) => return Some(hir_id),
763 // Ignore `return`s on the first iteration
764 Node::Expr(Expr { kind: ExprKind::Loop(..) | ExprKind::Ret(..), .. })
765 | Node::Local(_) => {
774 /// Retrieves the `HirId` for `id`'s parent item, or `id` itself if no
775 /// parent item is in this map. The "parent item" is the closest parent node
776 /// in the HIR which is recorded by the map and is an item, either an item
777 /// in a module, trait, or impl.
778 pub fn get_parent_item(&self, hir_id: HirId) -> HirId {
779 if let Some((hir_id, _node)) = self.parent_owner_iter(hir_id).next() {
786 /// Returns the `HirId` of `id`'s nearest module parent, or `id` itself if no
787 /// module parent is in this map.
788 pub(super) fn get_module_parent_node(&self, hir_id: HirId) -> HirId {
789 for (hir_id, node) in self.parent_owner_iter(hir_id) {
790 if let OwnerNode::Item(&Item { kind: ItemKind::Mod(_), .. }) = node {
797 /// When on an if expression, a match arm tail expression or a match arm, give back
798 /// the enclosing `if` or `match` expression.
800 /// Used by error reporting when there's a type error in an if or match arm caused by the
801 /// expression needing to be unit.
802 pub fn get_if_cause(&self, hir_id: HirId) -> Option<&'hir Expr<'hir>> {
803 for (_, node) in self.parent_iter(hir_id) {
806 | Node::ForeignItem(_)
809 | Node::Stmt(Stmt { kind: StmtKind::Local(_), .. }) => break,
810 Node::Expr(expr @ Expr { kind: ExprKind::If(..) | ExprKind::Match(..), .. }) => {
819 /// Returns the nearest enclosing scope. A scope is roughly an item or block.
820 pub fn get_enclosing_scope(&self, hir_id: HirId) -> Option<HirId> {
821 for (hir_id, node) in self.parent_iter(hir_id) {
822 if let Node::Item(Item {
825 | ItemKind::Const(..)
826 | ItemKind::Static(..)
829 | ItemKind::Struct(..)
830 | ItemKind::Union(..)
831 | ItemKind::Trait(..)
832 | ItemKind::Impl { .. },
835 | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(..), .. })
836 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(..), .. })
837 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(..), .. })
838 | Node::Block(_) = node
846 /// Returns the defining scope for an opaque type definition.
847 pub fn get_defining_scope(&self, id: HirId) -> HirId {
850 scope = self.get_enclosing_scope(scope).unwrap_or(CRATE_HIR_ID);
851 if scope == CRATE_HIR_ID || !matches!(self.get(scope), Node::Block(_)) {
857 pub fn get_parent_did(&self, id: HirId) -> LocalDefId {
858 self.local_def_id(self.get_parent_item(id))
861 pub fn get_foreign_abi(&self, hir_id: HirId) -> Abi {
862 let parent = self.get_parent_item(hir_id);
863 if let Some(node) = self.tcx.hir_owner(self.local_def_id(parent)) {
864 if let OwnerNode::Item(Item { kind: ItemKind::ForeignMod { abi, .. }, .. }) = node.node
869 bug!("expected foreign mod or inlined parent, found {}", self.node_to_string(parent))
872 pub fn expect_item(&self, id: HirId) -> &'hir Item<'hir> {
873 match self.tcx.hir_owner(id.expect_owner()) {
874 Some(Owner { node: OwnerNode::Item(item), .. }) => item,
875 _ => bug!("expected item, found {}", self.node_to_string(id)),
879 pub fn expect_impl_item(&self, id: HirId) -> &'hir ImplItem<'hir> {
880 match self.tcx.hir_owner(id.expect_owner()) {
881 Some(Owner { node: OwnerNode::ImplItem(item), .. }) => item,
882 _ => bug!("expected impl item, found {}", self.node_to_string(id)),
886 pub fn expect_trait_item(&self, id: HirId) -> &'hir TraitItem<'hir> {
887 match self.tcx.hir_owner(id.expect_owner()) {
888 Some(Owner { node: OwnerNode::TraitItem(item), .. }) => item,
889 _ => bug!("expected trait item, found {}", self.node_to_string(id)),
893 pub fn expect_variant(&self, id: HirId) -> &'hir Variant<'hir> {
894 match self.find(id) {
895 Some(Node::Variant(variant)) => variant,
896 _ => bug!("expected variant, found {}", self.node_to_string(id)),
900 pub fn expect_foreign_item(&self, id: HirId) -> &'hir ForeignItem<'hir> {
901 match self.tcx.hir_owner(id.expect_owner()) {
902 Some(Owner { node: OwnerNode::ForeignItem(item), .. }) => item,
903 _ => bug!("expected foreign item, found {}", self.node_to_string(id)),
907 pub fn expect_expr(&self, id: HirId) -> &'hir Expr<'hir> {
908 match self.find(id) {
909 Some(Node::Expr(expr)) => expr,
910 _ => bug!("expected expr, found {}", self.node_to_string(id)),
914 pub fn opt_name(&self, id: HirId) -> Option<Symbol> {
915 Some(match self.get(id) {
916 Node::Item(i) => i.ident.name,
917 Node::ForeignItem(fi) => fi.ident.name,
918 Node::ImplItem(ii) => ii.ident.name,
919 Node::TraitItem(ti) => ti.ident.name,
920 Node::Variant(v) => v.ident.name,
921 Node::Field(f) => f.ident.name,
922 Node::Lifetime(lt) => lt.name.ident().name,
923 Node::GenericParam(param) => param.name.ident().name,
924 Node::Binding(&Pat { kind: PatKind::Binding(_, _, l, _), .. }) => l.name,
925 Node::Ctor(..) => self.name(self.get_parent_item(id)),
930 pub fn name(&self, id: HirId) -> Symbol {
931 match self.opt_name(id) {
933 None => bug!("no name for {}", self.node_to_string(id)),
937 /// Given a node ID, gets a list of attributes associated with the AST
938 /// corresponding to the node-ID.
939 pub fn attrs(&self, id: HirId) -> &'hir [ast::Attribute] {
940 self.tcx.hir_attrs(id.owner).get(id.local_id)
943 /// Gets the span of the definition of the specified HIR node.
944 /// This is used by `tcx.get_span`
945 pub fn span(&self, hir_id: HirId) -> Span {
946 self.opt_span(hir_id)
947 .unwrap_or_else(|| bug!("hir::map::Map::span: id not in map: {:?}", hir_id))
950 pub fn opt_span(&self, hir_id: HirId) -> Option<Span> {
951 let span = match self.find(hir_id)? {
952 Node::Param(param) => param.span,
953 Node::Item(item) => match &item.kind {
954 ItemKind::Fn(sig, _, _) => sig.span,
957 Node::ForeignItem(foreign_item) => foreign_item.span,
958 Node::TraitItem(trait_item) => match &trait_item.kind {
959 TraitItemKind::Fn(sig, _) => sig.span,
960 _ => trait_item.span,
962 Node::ImplItem(impl_item) => match &impl_item.kind {
963 ImplItemKind::Fn(sig, _) => sig.span,
966 Node::Variant(variant) => variant.span,
967 Node::Field(field) => field.span,
968 Node::AnonConst(constant) => self.body(constant.body).value.span,
969 Node::Expr(expr) => expr.span,
970 Node::Stmt(stmt) => stmt.span,
971 Node::PathSegment(seg) => seg.ident.span,
972 Node::Ty(ty) => ty.span,
973 Node::TraitRef(tr) => tr.path.span,
974 Node::Binding(pat) => pat.span,
975 Node::Pat(pat) => pat.span,
976 Node::Arm(arm) => arm.span,
977 Node::Block(block) => block.span,
978 Node::Ctor(..) => match self.find(self.get_parent_node(hir_id))? {
979 Node::Item(item) => item.span,
980 Node::Variant(variant) => variant.span,
983 Node::Lifetime(lifetime) => lifetime.span,
984 Node::GenericParam(param) => param.span,
985 Node::Visibility(&Spanned {
986 node: VisibilityKind::Restricted { ref path, .. },
989 Node::Infer(i) => i.span,
990 Node::Visibility(v) => bug!("unexpected Visibility {:?}", v),
991 Node::Local(local) => local.span,
992 Node::Crate(item) => item.inner,
997 /// Like `hir.span()`, but includes the body of function items
998 /// (instead of just the function header)
999 pub fn span_with_body(&self, hir_id: HirId) -> Span {
1000 match self.find(hir_id) {
1001 Some(Node::TraitItem(item)) => item.span,
1002 Some(Node::ImplItem(impl_item)) => impl_item.span,
1003 Some(Node::Item(item)) => item.span,
1004 Some(_) => self.span(hir_id),
1005 _ => bug!("hir::map::Map::span_with_body: id not in map: {:?}", hir_id),
1009 pub fn span_if_local(&self, id: DefId) -> Option<Span> {
1010 id.as_local().and_then(|id| self.opt_span(self.local_def_id_to_hir_id(id)))
1013 pub fn res_span(&self, res: Res) -> Option<Span> {
1016 Res::Local(id) => Some(self.span(id)),
1017 res => self.span_if_local(res.opt_def_id()?),
1021 /// Get a representation of this `id` for debugging purposes.
1022 /// NOTE: Do NOT use this in diagnostics!
1023 pub fn node_to_string(&self, id: HirId) -> String {
1024 hir_id_to_string(self, id)
1027 /// Returns the HirId of `N` in `struct Foo<const N: usize = { ... }>` when
1028 /// called with the HirId for the `{ ... }` anon const
1029 pub fn opt_const_param_default_param_hir_id(&self, anon_const: HirId) -> Option<HirId> {
1030 match self.get(self.get_parent_node(anon_const)) {
1031 Node::GenericParam(GenericParam {
1033 kind: GenericParamKind::Const { .. },
1035 }) => Some(*param_id),
1041 impl<'hir> intravisit::Map<'hir> for Map<'hir> {
1042 fn find(&self, hir_id: HirId) -> Option<Node<'hir>> {
1046 fn body(&self, id: BodyId) -> &'hir Body<'hir> {
1050 fn item(&self, id: ItemId) -> &'hir Item<'hir> {
1054 fn trait_item(&self, id: TraitItemId) -> &'hir TraitItem<'hir> {
1058 fn impl_item(&self, id: ImplItemId) -> &'hir ImplItem<'hir> {
1062 fn foreign_item(&self, id: ForeignItemId) -> &'hir ForeignItem<'hir> {
1063 self.foreign_item(id)
1067 pub(super) fn crate_hash(tcx: TyCtxt<'_>, crate_num: CrateNum) -> Svh {
1068 debug_assert_eq!(crate_num, LOCAL_CRATE);
1069 let mut hir_body_nodes: Vec<_> = tcx
1070 .untracked_resolutions
1073 .all_def_path_hashes_and_def_ids()
1074 .filter_map(|(def_path_hash, local_def_index)| {
1075 let def_id = LocalDefId { local_def_index };
1076 let hash = tcx.hir_crate(()).owners[def_id].as_ref()?.nodes.hash;
1077 Some((def_path_hash, hash, def_id))
1080 hir_body_nodes.sort_unstable_by_key(|bn| bn.0);
1082 let upstream_crates = upstream_crates(tcx);
1084 // We hash the final, remapped names of all local source files so we
1085 // don't have to include the path prefix remapping commandline args.
1086 // If we included the full mapping in the SVH, we could only have
1087 // reproducible builds by compiling from the same directory. So we just
1088 // hash the result of the mapping instead of the mapping itself.
1089 let mut source_file_names: Vec<_> = tcx
1094 .filter(|source_file| source_file.cnum == LOCAL_CRATE)
1095 .map(|source_file| source_file.name_hash)
1098 source_file_names.sort_unstable();
1100 let mut hcx = tcx.create_stable_hashing_context();
1101 let mut stable_hasher = StableHasher::new();
1102 for (def_path_hash, fingerprint, def_id) in hir_body_nodes.iter() {
1103 def_path_hash.0.hash_stable(&mut hcx, &mut stable_hasher);
1104 fingerprint.hash_stable(&mut hcx, &mut stable_hasher);
1105 tcx.untracked_crate.owners[*def_id]
1109 .hash_stable(&mut hcx, &mut stable_hasher);
1110 if tcx.sess.opts.debugging_opts.incremental_relative_spans {
1111 let span = tcx.untracked_resolutions.definitions.def_span(*def_id);
1112 debug_assert_eq!(span.parent(), None);
1113 span.hash_stable(&mut hcx, &mut stable_hasher);
1116 upstream_crates.hash_stable(&mut hcx, &mut stable_hasher);
1117 source_file_names.hash_stable(&mut hcx, &mut stable_hasher);
1118 tcx.sess.opts.dep_tracking_hash(true).hash_stable(&mut hcx, &mut stable_hasher);
1119 tcx.sess.local_stable_crate_id().hash_stable(&mut hcx, &mut stable_hasher);
1121 let crate_hash: Fingerprint = stable_hasher.finish();
1122 Svh::new(crate_hash.to_smaller_hash())
1125 fn upstream_crates(tcx: TyCtxt<'_>) -> Vec<(StableCrateId, Svh)> {
1126 let mut upstream_crates: Vec<_> = tcx
1130 let stable_crate_id = tcx.resolutions(()).cstore.stable_crate_id(cnum);
1131 let hash = tcx.crate_hash(cnum);
1132 (stable_crate_id, hash)
1135 upstream_crates.sort_unstable_by_key(|&(stable_crate_id, _)| stable_crate_id);
1139 fn hir_id_to_string(map: &Map<'_>, id: HirId) -> String {
1140 let id_str = format!(" (hir_id={})", id);
1143 // This functionality is used for debugging, try to use `TyCtxt` to get
1144 // the user-friendly path, otherwise fall back to stringifying `DefPath`.
1145 crate::ty::tls::with_opt(|tcx| {
1146 if let Some(tcx) = tcx {
1147 let def_id = map.local_def_id(id);
1148 tcx.def_path_str(def_id.to_def_id())
1149 } else if let Some(path) = map.def_path_from_hir_id(id) {
1150 path.data.into_iter().map(|elem| elem.to_string()).collect::<Vec<_>>().join("::")
1152 String::from("<missing path>")
1157 let span_str = || map.tcx.sess.source_map().span_to_snippet(map.span(id)).unwrap_or_default();
1158 let node_str = |prefix| format!("{} {}{}", prefix, span_str(), id_str);
1160 match map.find(id) {
1161 Some(Node::Item(item)) => {
1162 let item_str = match item.kind {
1163 ItemKind::ExternCrate(..) => "extern crate",
1164 ItemKind::Use(..) => "use",
1165 ItemKind::Static(..) => "static",
1166 ItemKind::Const(..) => "const",
1167 ItemKind::Fn(..) => "fn",
1168 ItemKind::Macro(..) => "macro",
1169 ItemKind::Mod(..) => "mod",
1170 ItemKind::ForeignMod { .. } => "foreign mod",
1171 ItemKind::GlobalAsm(..) => "global asm",
1172 ItemKind::TyAlias(..) => "ty",
1173 ItemKind::OpaqueTy(..) => "opaque type",
1174 ItemKind::Enum(..) => "enum",
1175 ItemKind::Struct(..) => "struct",
1176 ItemKind::Union(..) => "union",
1177 ItemKind::Trait(..) => "trait",
1178 ItemKind::TraitAlias(..) => "trait alias",
1179 ItemKind::Impl { .. } => "impl",
1181 format!("{} {}{}", item_str, path_str(), id_str)
1183 Some(Node::ForeignItem(_)) => format!("foreign item {}{}", path_str(), id_str),
1184 Some(Node::ImplItem(ii)) => match ii.kind {
1185 ImplItemKind::Const(..) => {
1186 format!("assoc const {} in {}{}", ii.ident, path_str(), id_str)
1188 ImplItemKind::Fn(..) => format!("method {} in {}{}", ii.ident, path_str(), id_str),
1189 ImplItemKind::TyAlias(_) => {
1190 format!("assoc type {} in {}{}", ii.ident, path_str(), id_str)
1193 Some(Node::TraitItem(ti)) => {
1194 let kind = match ti.kind {
1195 TraitItemKind::Const(..) => "assoc constant",
1196 TraitItemKind::Fn(..) => "trait method",
1197 TraitItemKind::Type(..) => "assoc type",
1200 format!("{} {} in {}{}", kind, ti.ident, path_str(), id_str)
1202 Some(Node::Variant(ref variant)) => {
1203 format!("variant {} in {}{}", variant.ident, path_str(), id_str)
1205 Some(Node::Field(ref field)) => {
1206 format!("field {} in {}{}", field.ident, path_str(), id_str)
1208 Some(Node::AnonConst(_)) => node_str("const"),
1209 Some(Node::Expr(_)) => node_str("expr"),
1210 Some(Node::Stmt(_)) => node_str("stmt"),
1211 Some(Node::PathSegment(_)) => node_str("path segment"),
1212 Some(Node::Ty(_)) => node_str("type"),
1213 Some(Node::TraitRef(_)) => node_str("trait ref"),
1214 Some(Node::Binding(_)) => node_str("local"),
1215 Some(Node::Pat(_)) => node_str("pat"),
1216 Some(Node::Param(_)) => node_str("param"),
1217 Some(Node::Arm(_)) => node_str("arm"),
1218 Some(Node::Block(_)) => node_str("block"),
1219 Some(Node::Infer(_)) => node_str("infer"),
1220 Some(Node::Local(_)) => node_str("local"),
1221 Some(Node::Ctor(..)) => format!("ctor {}{}", path_str(), id_str),
1222 Some(Node::Lifetime(_)) => node_str("lifetime"),
1223 Some(Node::GenericParam(ref param)) => format!("generic_param {:?}{}", param, id_str),
1224 Some(Node::Visibility(ref vis)) => format!("visibility {:?}{}", vis, id_str),
1225 Some(Node::Crate(..)) => String::from("root_crate"),
1226 None => format!("unknown node{}", id_str),
1230 pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalDefId) -> ModuleItems {
1231 let mut collector = ModuleCollector {
1233 submodules: Vec::default(),
1234 items: Vec::default(),
1235 trait_items: Vec::default(),
1236 impl_items: Vec::default(),
1237 foreign_items: Vec::default(),
1240 let (hir_mod, span, hir_id) = tcx.hir().get_module(module_id);
1241 collector.visit_mod(hir_mod, span, hir_id);
1243 let ModuleCollector { submodules, items, trait_items, impl_items, foreign_items, .. } =
1245 return ModuleItems {
1246 submodules: submodules.into_boxed_slice(),
1247 items: items.into_boxed_slice(),
1248 trait_items: trait_items.into_boxed_slice(),
1249 impl_items: impl_items.into_boxed_slice(),
1250 foreign_items: foreign_items.into_boxed_slice(),
1253 struct ModuleCollector<'tcx> {
1255 submodules: Vec<LocalDefId>,
1257 trait_items: Vec<TraitItemId>,
1258 impl_items: Vec<ImplItemId>,
1259 foreign_items: Vec<ForeignItemId>,
1262 impl<'hir> Visitor<'hir> for ModuleCollector<'hir> {
1263 type Map = Map<'hir>;
1265 fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap<Self::Map> {
1266 intravisit::NestedVisitorMap::All(self.tcx.hir())
1269 fn visit_item(&mut self, item: &'hir Item<'hir>) {
1270 self.items.push(item.item_id());
1271 if let ItemKind::Mod(..) = item.kind {
1272 // If this declares another module, do not recurse inside it.
1273 self.submodules.push(item.def_id);
1275 intravisit::walk_item(self, item)
1279 fn visit_trait_item(&mut self, item: &'hir TraitItem<'hir>) {
1280 self.trait_items.push(item.trait_item_id());
1281 intravisit::walk_trait_item(self, item)
1284 fn visit_impl_item(&mut self, item: &'hir ImplItem<'hir>) {
1285 self.impl_items.push(item.impl_item_id());
1286 intravisit::walk_impl_item(self, item)
1289 fn visit_foreign_item(&mut self, item: &'hir ForeignItem<'hir>) {
1290 self.foreign_items.push(item.foreign_item_id());
1291 intravisit::walk_foreign_item(self, item)