1 use self::collector::NodeCollector;
3 use crate::hir::{AttributeMap, IndexedHir, ModuleItems, Owner};
6 use rustc_data_structures::fingerprint::Fingerprint;
7 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
8 use rustc_data_structures::svh::Svh;
9 use rustc_data_structures::sync::{self, par_iter};
10 use rustc_hir::def::{DefKind, Res};
11 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_ID, CRATE_DEF_INDEX, LOCAL_CRATE};
12 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
13 use rustc_hir::intravisit::{self, Visitor};
14 use rustc_hir::itemlikevisit::ItemLikeVisitor;
16 use rustc_index::vec::Idx;
17 use rustc_span::def_id::StableCrateId;
18 use rustc_span::hygiene::MacroKind;
19 use rustc_span::source_map::Spanned;
20 use rustc_span::symbol::{kw, sym, Ident, Symbol};
22 use rustc_target::spec::abi::Abi;
23 use std::collections::BTreeSet;
28 fn fn_decl<'hir>(node: Node<'hir>) -> Option<&'hir FnDecl<'hir>> {
30 Node::Item(Item { kind: ItemKind::Fn(sig, _, _), .. })
31 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, _), .. })
32 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, _), .. }) => Some(&sig.decl),
33 Node::Expr(Expr { kind: ExprKind::Closure(_, fn_decl, ..), .. })
34 | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(fn_decl, ..), .. }) => {
41 pub fn fn_sig<'hir>(node: Node<'hir>) -> Option<&'hir FnSig<'hir>> {
43 Node::Item(Item { kind: ItemKind::Fn(sig, _, _), .. })
44 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, _), .. })
45 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, _), .. }) => Some(sig),
50 pub fn associated_body<'hir>(node: Node<'hir>) -> Option<BodyId> {
53 kind: ItemKind::Const(_, body) | ItemKind::Static(.., body) | ItemKind::Fn(.., body),
56 | Node::TraitItem(TraitItem {
58 TraitItemKind::Const(_, Some(body)) | TraitItemKind::Fn(_, TraitFn::Provided(body)),
61 | Node::ImplItem(ImplItem {
62 kind: ImplItemKind::Const(_, body) | ImplItemKind::Fn(_, body),
65 | Node::Expr(Expr { kind: ExprKind::Closure(.., body, _, _), .. }) => Some(*body),
67 Node::AnonConst(constant) => Some(constant.body),
73 fn is_body_owner<'hir>(node: Node<'hir>, hir_id: HirId) -> bool {
74 match associated_body(node) {
75 Some(b) => b.hir_id == hir_id,
80 #[derive(Copy, Clone)]
81 pub struct Map<'hir> {
82 pub(super) tcx: TyCtxt<'hir>,
85 /// An iterator that walks up the ancestor tree of a given `HirId`.
86 /// Constructed using `tcx.hir().parent_iter(hir_id)`.
87 pub struct ParentHirIterator<'map, 'hir> {
92 impl<'hir> Iterator for ParentHirIterator<'_, 'hir> {
93 type Item = (HirId, Node<'hir>);
95 fn next(&mut self) -> Option<Self::Item> {
96 if self.current_id == CRATE_HIR_ID {
100 // There are nodes that do not have entries, so we need to skip them.
101 let parent_id = self.map.get_parent_node(self.current_id);
103 if parent_id == self.current_id {
104 self.current_id = CRATE_HIR_ID;
108 self.current_id = parent_id;
109 if let Some(node) = self.map.find(parent_id) {
110 return Some((parent_id, node));
112 // If this `HirId` doesn't have an entry, skip it and look for its `parent_id`.
117 /// An iterator that walks up the ancestor tree of a given `HirId`.
118 /// Constructed using `tcx.hir().parent_owner_iter(hir_id)`.
119 pub struct ParentOwnerIterator<'map, 'hir> {
121 map: &'map Map<'hir>,
124 impl<'hir> Iterator for ParentOwnerIterator<'_, 'hir> {
125 type Item = (HirId, OwnerNode<'hir>);
127 fn next(&mut self) -> Option<Self::Item> {
128 if self.current_id.local_id.index() != 0 {
129 self.current_id.local_id = ItemLocalId::new(0);
130 if let Some(node) = self.map.tcx.hir_owner(self.current_id.owner) {
131 return Some((self.current_id, node.node));
134 if self.current_id == CRATE_HIR_ID {
138 // There are nodes that do not have entries, so we need to skip them.
139 let parent_id = self.map.def_key(self.current_id.owner).parent;
141 let parent_id = parent_id.map_or(CRATE_HIR_ID.owner, |local_def_index| {
142 let def_id = LocalDefId { local_def_index };
143 self.map.local_def_id_to_hir_id(def_id).owner
145 self.current_id = HirId::make_owner(parent_id);
147 // If this `HirId` doesn't have an entry, skip it and look for its `parent_id`.
148 if let Some(node) = self.map.tcx.hir_owner(self.current_id.owner) {
149 return Some((self.current_id, node.node));
155 impl<'hir> Map<'hir> {
156 pub fn krate(&self) -> &'hir Crate<'hir> {
157 self.tcx.hir_crate(())
160 pub fn def_key(&self, def_id: LocalDefId) -> DefKey {
161 // Accessing the DefKey is ok, since it is part of DefPathHash.
162 self.tcx.untracked_resolutions.definitions.def_key(def_id)
165 pub fn def_path_from_hir_id(&self, id: HirId) -> Option<DefPath> {
166 self.opt_local_def_id(id).map(|def_id| self.def_path(def_id))
169 pub fn def_path(&self, def_id: LocalDefId) -> DefPath {
170 // Accessing the DefPath is ok, since it is part of DefPathHash.
171 self.tcx.untracked_resolutions.definitions.def_path(def_id)
175 pub fn def_path_hash(self, def_id: LocalDefId) -> DefPathHash {
176 // Accessing the DefPathHash is ok, it is incr. comp. stable.
177 self.tcx.untracked_resolutions.definitions.def_path_hash(def_id)
181 pub fn local_def_id(&self, hir_id: HirId) -> LocalDefId {
182 self.opt_local_def_id(hir_id).unwrap_or_else(|| {
184 "local_def_id: no entry for `{:?}`, which has a map of `{:?}`",
192 pub fn opt_local_def_id(&self, hir_id: HirId) -> Option<LocalDefId> {
193 // FIXME(#85914) is this access safe for incr. comp.?
194 self.tcx.untracked_resolutions.definitions.opt_hir_id_to_local_def_id(hir_id)
198 pub fn local_def_id_to_hir_id(&self, def_id: LocalDefId) -> HirId {
199 // FIXME(#85914) is this access safe for incr. comp.?
200 self.tcx.untracked_resolutions.definitions.local_def_id_to_hir_id(def_id)
203 pub fn iter_local_def_id(&self) -> impl Iterator<Item = LocalDefId> + '_ {
204 // Create a dependency to the crate to be sure we reexcute this when the amount of
205 // definitions change.
206 self.tcx.ensure().hir_crate(());
207 self.tcx.untracked_resolutions.definitions.iter_local_def_id()
210 pub fn opt_def_kind(&self, local_def_id: LocalDefId) -> Option<DefKind> {
211 // FIXME(eddyb) support `find` on the crate root.
212 if local_def_id.to_def_id().index == CRATE_DEF_INDEX {
213 return Some(DefKind::Mod);
216 let hir_id = self.local_def_id_to_hir_id(local_def_id);
217 let def_kind = match self.find(hir_id)? {
218 Node::Item(item) => match item.kind {
219 ItemKind::Static(..) => DefKind::Static,
220 ItemKind::Const(..) => DefKind::Const,
221 ItemKind::Fn(..) => DefKind::Fn,
222 ItemKind::Macro(..) => DefKind::Macro(MacroKind::Bang),
223 ItemKind::Mod(..) => DefKind::Mod,
224 ItemKind::OpaqueTy(..) => DefKind::OpaqueTy,
225 ItemKind::TyAlias(..) => DefKind::TyAlias,
226 ItemKind::Enum(..) => DefKind::Enum,
227 ItemKind::Struct(..) => DefKind::Struct,
228 ItemKind::Union(..) => DefKind::Union,
229 ItemKind::Trait(..) => DefKind::Trait,
230 ItemKind::TraitAlias(..) => DefKind::TraitAlias,
231 ItemKind::ExternCrate(_) => DefKind::ExternCrate,
232 ItemKind::Use(..) => DefKind::Use,
233 ItemKind::ForeignMod { .. } => DefKind::ForeignMod,
234 ItemKind::GlobalAsm(..) => DefKind::GlobalAsm,
235 ItemKind::Impl { .. } => DefKind::Impl,
237 Node::ForeignItem(item) => match item.kind {
238 ForeignItemKind::Fn(..) => DefKind::Fn,
239 ForeignItemKind::Static(..) => DefKind::Static,
240 ForeignItemKind::Type => DefKind::ForeignTy,
242 Node::TraitItem(item) => match item.kind {
243 TraitItemKind::Const(..) => DefKind::AssocConst,
244 TraitItemKind::Fn(..) => DefKind::AssocFn,
245 TraitItemKind::Type(..) => DefKind::AssocTy,
247 Node::ImplItem(item) => match item.kind {
248 ImplItemKind::Const(..) => DefKind::AssocConst,
249 ImplItemKind::Fn(..) => DefKind::AssocFn,
250 ImplItemKind::TyAlias(..) => DefKind::AssocTy,
252 Node::Variant(_) => DefKind::Variant,
253 Node::Ctor(variant_data) => {
254 // FIXME(eddyb) is this even possible, if we have a `Node::Ctor`?
255 assert_ne!(variant_data.ctor_hir_id(), None);
257 let ctor_of = match self.find(self.get_parent_node(hir_id)) {
258 Some(Node::Item(..)) => def::CtorOf::Struct,
259 Some(Node::Variant(..)) => def::CtorOf::Variant,
262 DefKind::Ctor(ctor_of, def::CtorKind::from_hir(variant_data))
264 Node::AnonConst(_) => DefKind::AnonConst,
265 Node::Field(_) => DefKind::Field,
266 Node::Expr(expr) => match expr.kind {
267 ExprKind::Closure(.., None) => DefKind::Closure,
268 ExprKind::Closure(.., Some(_)) => DefKind::Generator,
269 _ => bug!("def_kind: unsupported node: {}", self.node_to_string(hir_id)),
271 Node::GenericParam(param) => match param.kind {
272 GenericParamKind::Lifetime { .. } => DefKind::LifetimeParam,
273 GenericParamKind::Type { .. } => DefKind::TyParam,
274 GenericParamKind::Const { .. } => DefKind::ConstParam,
276 Node::Crate(_) => DefKind::Mod,
278 | Node::PathSegment(_)
288 | Node::Visibility(_)
289 | Node::Block(_) => return None,
294 pub fn def_kind(&self, local_def_id: LocalDefId) -> DefKind {
295 self.opt_def_kind(local_def_id)
296 .unwrap_or_else(|| bug!("def_kind: unsupported node: {:?}", local_def_id))
299 pub fn find_parent_node(&self, id: HirId) -> Option<HirId> {
300 if id.local_id == ItemLocalId::from_u32(0) {
301 Some(self.tcx.hir_owner_parent(id.owner))
303 let owner = self.tcx.hir_owner_nodes(id.owner)?;
304 let node = owner.nodes[id.local_id].as_ref()?;
305 let hir_id = HirId { owner: id.owner, local_id: node.parent };
310 pub fn get_parent_node(&self, hir_id: HirId) -> HirId {
311 self.find_parent_node(hir_id).unwrap_or(CRATE_HIR_ID)
314 /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found.
315 pub fn find(&self, id: HirId) -> Option<Node<'hir>> {
316 if id.local_id == ItemLocalId::from_u32(0) {
317 let owner = self.tcx.hir_owner(id.owner)?;
318 Some(owner.node.into())
320 let owner = self.tcx.hir_owner_nodes(id.owner)?;
321 let node = owner.nodes[id.local_id].as_ref()?;
326 /// Retrieves the `Node` corresponding to `id`, panicking if it cannot be found.
327 pub fn get(&self, id: HirId) -> Node<'hir> {
328 self.find(id).unwrap_or_else(|| bug!("couldn't find hir id {} in the HIR map", id))
331 pub fn get_if_local(&self, id: DefId) -> Option<Node<'hir>> {
332 id.as_local().and_then(|id| self.find(self.local_def_id_to_hir_id(id)))
335 pub fn get_generics(&self, id: DefId) -> Option<&'hir Generics<'hir>> {
336 let id = id.as_local()?;
337 let node = self.tcx.hir_owner(id)?;
339 OwnerNode::ImplItem(impl_item) => Some(&impl_item.generics),
340 OwnerNode::TraitItem(trait_item) => Some(&trait_item.generics),
341 OwnerNode::Item(Item {
343 ItemKind::Fn(_, generics, _)
344 | ItemKind::TyAlias(_, generics)
345 | ItemKind::Enum(_, generics)
346 | ItemKind::Struct(_, generics)
347 | ItemKind::Union(_, generics)
348 | ItemKind::Trait(_, _, generics, ..)
349 | ItemKind::TraitAlias(generics, _)
350 | ItemKind::Impl(Impl { generics, .. }),
352 }) => Some(generics),
357 pub fn item(&self, id: ItemId) -> &'hir Item<'hir> {
358 self.tcx.hir_owner(id.def_id).unwrap().node.expect_item()
361 pub fn trait_item(&self, id: TraitItemId) -> &'hir TraitItem<'hir> {
362 self.tcx.hir_owner(id.def_id).unwrap().node.expect_trait_item()
365 pub fn impl_item(&self, id: ImplItemId) -> &'hir ImplItem<'hir> {
366 self.tcx.hir_owner(id.def_id).unwrap().node.expect_impl_item()
369 pub fn foreign_item(&self, id: ForeignItemId) -> &'hir ForeignItem<'hir> {
370 self.tcx.hir_owner(id.def_id).unwrap().node.expect_foreign_item()
373 pub fn body(&self, id: BodyId) -> &'hir Body<'hir> {
374 self.tcx.hir_owner_nodes(id.hir_id.owner).unwrap().bodies.get(&id.hir_id.local_id).unwrap()
377 pub fn fn_decl_by_hir_id(&self, hir_id: HirId) -> Option<&'hir FnDecl<'hir>> {
378 if let Some(node) = self.find(hir_id) {
381 bug!("no node for hir_id `{}`", hir_id)
385 pub fn fn_sig_by_hir_id(&self, hir_id: HirId) -> Option<&'hir FnSig<'hir>> {
386 if let Some(node) = self.find(hir_id) {
389 bug!("no node for hir_id `{}`", hir_id)
393 pub fn enclosing_body_owner(&self, hir_id: HirId) -> HirId {
394 for (parent, _) in self.parent_iter(hir_id) {
395 if let Some(body) = self.maybe_body_owned_by(parent) {
396 return self.body_owner(body);
400 bug!("no `enclosing_body_owner` for hir_id `{}`", hir_id);
403 /// Returns the `HirId` that corresponds to the definition of
404 /// which this is the body of, i.e., a `fn`, `const` or `static`
405 /// item (possibly associated), a closure, or a `hir::AnonConst`.
406 pub fn body_owner(&self, BodyId { hir_id }: BodyId) -> HirId {
407 let parent = self.get_parent_node(hir_id);
408 assert!(self.find(parent).map_or(false, |n| is_body_owner(n, hir_id)));
412 pub fn body_owner_def_id(&self, id: BodyId) -> LocalDefId {
413 self.local_def_id(self.body_owner(id))
416 /// Given a `HirId`, returns the `BodyId` associated with it,
417 /// if the node is a body owner, otherwise returns `None`.
418 pub fn maybe_body_owned_by(&self, hir_id: HirId) -> Option<BodyId> {
419 self.find(hir_id).map(associated_body).flatten()
422 /// Given a body owner's id, returns the `BodyId` associated with it.
423 pub fn body_owned_by(&self, id: HirId) -> BodyId {
424 self.maybe_body_owned_by(id).unwrap_or_else(|| {
427 "body_owned_by: {} has no associated body",
428 self.node_to_string(id)
433 pub fn body_param_names(&self, id: BodyId) -> impl Iterator<Item = Ident> + 'hir {
434 self.body(id).params.iter().map(|arg| match arg.pat.kind {
435 PatKind::Binding(_, _, ident, _) => ident,
436 _ => Ident::new(kw::Empty, rustc_span::DUMMY_SP),
440 /// Returns the `BodyOwnerKind` of this `LocalDefId`.
442 /// Panics if `LocalDefId` does not have an associated body.
443 pub fn body_owner_kind(&self, id: HirId) -> BodyOwnerKind {
445 Node::Item(&Item { kind: ItemKind::Const(..), .. })
446 | Node::TraitItem(&TraitItem { kind: TraitItemKind::Const(..), .. })
447 | Node::ImplItem(&ImplItem { kind: ImplItemKind::Const(..), .. })
448 | Node::AnonConst(_) => BodyOwnerKind::Const,
450 | Node::Item(&Item { kind: ItemKind::Fn(..), .. })
451 | Node::TraitItem(&TraitItem { kind: TraitItemKind::Fn(..), .. })
452 | Node::ImplItem(&ImplItem { kind: ImplItemKind::Fn(..), .. }) => BodyOwnerKind::Fn,
453 Node::Item(&Item { kind: ItemKind::Static(_, m, _), .. }) => BodyOwnerKind::Static(m),
454 Node::Expr(&Expr { kind: ExprKind::Closure(..), .. }) => BodyOwnerKind::Closure,
455 node => bug!("{:#?} is not a body node", node),
459 /// Returns the `ConstContext` of the body associated with this `LocalDefId`.
461 /// Panics if `LocalDefId` does not have an associated body.
463 /// This should only be used for determining the context of a body, a return
464 /// value of `Some` does not always suggest that the owner of the body is `const`.
465 pub fn body_const_context(&self, did: LocalDefId) -> Option<ConstContext> {
466 let hir_id = self.local_def_id_to_hir_id(did);
467 let ccx = match self.body_owner_kind(hir_id) {
468 BodyOwnerKind::Const => ConstContext::Const,
469 BodyOwnerKind::Static(mt) => ConstContext::Static(mt),
471 BodyOwnerKind::Fn if self.tcx.is_constructor(did.to_def_id()) => return None,
472 BodyOwnerKind::Fn if self.tcx.is_const_fn_raw(did.to_def_id()) => ConstContext::ConstFn,
474 if self.tcx.has_attr(did.to_def_id(), sym::default_method_body_is_const) =>
476 ConstContext::ConstFn
478 BodyOwnerKind::Fn | BodyOwnerKind::Closure => return None,
484 pub fn ty_param_owner(&self, id: HirId) -> HirId {
486 Node::Item(&Item { kind: ItemKind::Trait(..) | ItemKind::TraitAlias(..), .. }) => id,
487 Node::GenericParam(_) => self.get_parent_node(id),
488 _ => bug!("ty_param_owner: {} not a type parameter", self.node_to_string(id)),
492 pub fn ty_param_name(&self, id: HirId) -> Symbol {
494 Node::Item(&Item { kind: ItemKind::Trait(..) | ItemKind::TraitAlias(..), .. }) => {
497 Node::GenericParam(param) => param.name.ident().name,
498 _ => bug!("ty_param_name: {} not a type parameter", self.node_to_string(id)),
502 pub fn trait_impls(&self, trait_did: DefId) -> &'hir [LocalDefId] {
503 self.tcx.all_local_trait_impls(()).get(&trait_did).map_or(&[], |xs| &xs[..])
506 /// Gets the attributes on the crate. This is preferable to
507 /// invoking `krate.attrs` because it registers a tighter
508 /// dep-graph access.
509 pub fn krate_attrs(&self) -> &'hir [ast::Attribute] {
510 self.attrs(CRATE_HIR_ID)
513 pub fn get_module(&self, module: LocalDefId) -> (&'hir Mod<'hir>, Span, HirId) {
514 let hir_id = HirId::make_owner(module);
515 match self.tcx.hir_owner(module).map(|o| o.node) {
516 Some(OwnerNode::Item(&Item { span, kind: ItemKind::Mod(ref m), .. })) => {
519 Some(OwnerNode::Crate(item)) => (item, item.inner, hir_id),
520 node => panic!("not a module: {:?}", node),
524 /// Walks the contents of a crate. See also `Crate::visit_all_items`.
525 pub fn walk_toplevel_module(self, visitor: &mut impl Visitor<'hir>) {
526 let (top_mod, span, hir_id) = self.get_module(CRATE_DEF_ID);
527 visitor.visit_mod(top_mod, span, hir_id);
530 /// Walks the attributes in a crate.
531 pub fn walk_attributes(self, visitor: &mut impl Visitor<'hir>) {
532 let krate = self.krate();
533 for (&id, attrs) in krate.attrs.iter() {
535 visitor.visit_attribute(id, a)
540 pub fn visit_item_likes_in_module<V>(&self, module: LocalDefId, visitor: &mut V)
542 V: ItemLikeVisitor<'hir>,
544 let module = self.tcx.hir_module_items(module);
546 for id in &module.items {
547 visitor.visit_item(self.item(*id));
550 for id in &module.trait_items {
551 visitor.visit_trait_item(self.trait_item(*id));
554 for id in &module.impl_items {
555 visitor.visit_impl_item(self.impl_item(*id));
558 for id in &module.foreign_items {
559 visitor.visit_foreign_item(self.foreign_item(*id));
563 pub fn for_each_module(&self, f: impl Fn(LocalDefId)) {
564 let mut queue = BTreeSet::default();
565 queue.insert(CRATE_DEF_ID);
567 while let Some(id) = queue.pop_first() {
569 let items = self.tcx.hir_module_items(id);
570 queue.extend(items.submodules.iter().copied())
574 pub fn par_for_each_module(&self, f: impl Fn(LocalDefId) + sync::Sync) {
575 use rustc_data_structures::sync::ParallelIterator;
576 par_iter_submodules(self.tcx, CRATE_DEF_ID, &f);
578 fn par_iter_submodules<F>(tcx: TyCtxt<'_>, module: LocalDefId, f: &F)
580 F: Fn(LocalDefId) + sync::Sync,
583 let items = tcx.hir_module_items(module);
584 par_iter(&items.submodules).for_each(|&sm| par_iter_submodules(tcx, sm, f));
588 /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
589 /// until the crate root is reached. Prefer this over your own loop using `get_parent_node`.
590 pub fn parent_iter(&self, current_id: HirId) -> ParentHirIterator<'_, 'hir> {
591 ParentHirIterator { current_id, map: self }
594 /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
595 /// until the crate root is reached. Prefer this over your own loop using `get_parent_node`.
596 pub fn parent_owner_iter(&self, current_id: HirId) -> ParentOwnerIterator<'_, 'hir> {
597 ParentOwnerIterator { current_id, map: self }
600 /// Checks if the node is left-hand side of an assignment.
601 pub fn is_lhs(&self, id: HirId) -> bool {
602 match self.find(self.get_parent_node(id)) {
603 Some(Node::Expr(expr)) => match expr.kind {
604 ExprKind::Assign(lhs, _rhs, _span) => lhs.hir_id == id,
611 /// Whether the expression pointed at by `hir_id` belongs to a `const` evaluation context.
612 /// Used exclusively for diagnostics, to avoid suggestion function calls.
613 pub fn is_inside_const_context(&self, hir_id: HirId) -> bool {
614 self.body_const_context(self.local_def_id(self.enclosing_body_owner(hir_id))).is_some()
617 /// Retrieves the `HirId` for `id`'s enclosing method, unless there's a
618 /// `while` or `loop` before reaching it, as block tail returns are not
619 /// available in them.
622 /// fn foo(x: usize) -> bool {
624 /// true // If `get_return_block` gets passed the `id` corresponding
625 /// } else { // to this, it will return `foo`'s `HirId`.
632 /// fn foo(x: usize) -> bool {
634 /// true // If `get_return_block` gets passed the `id` corresponding
635 /// } // to this, it will return `None`.
639 pub fn get_return_block(&self, id: HirId) -> Option<HirId> {
640 let mut iter = self.parent_iter(id).peekable();
641 let mut ignore_tail = false;
642 if let Some(node) = self.find(id) {
643 if let Node::Expr(Expr { kind: ExprKind::Ret(_), .. }) = node {
644 // When dealing with `return` statements, we don't care about climbing only tail
649 while let Some((hir_id, node)) = iter.next() {
650 if let (Some((_, next_node)), false) = (iter.peek(), ignore_tail) {
652 Node::Block(Block { expr: None, .. }) => return None,
653 // The current node is not the tail expression of its parent.
654 Node::Block(Block { expr: Some(e), .. }) if hir_id != e.hir_id => return None,
660 | Node::ForeignItem(_)
662 | Node::Expr(Expr { kind: ExprKind::Closure(..), .. })
663 | Node::ImplItem(_) => return Some(hir_id),
664 // Ignore `return`s on the first iteration
665 Node::Expr(Expr { kind: ExprKind::Loop(..) | ExprKind::Ret(..), .. })
666 | Node::Local(_) => {
675 /// Retrieves the `HirId` for `id`'s parent item, or `id` itself if no
676 /// parent item is in this map. The "parent item" is the closest parent node
677 /// in the HIR which is recorded by the map and is an item, either an item
678 /// in a module, trait, or impl.
679 pub fn get_parent_item(&self, hir_id: HirId) -> HirId {
680 if let Some((hir_id, _node)) = self.parent_owner_iter(hir_id).next() {
687 /// Returns the `HirId` of `id`'s nearest module parent, or `id` itself if no
688 /// module parent is in this map.
689 pub(super) fn get_module_parent_node(&self, hir_id: HirId) -> HirId {
690 for (hir_id, node) in self.parent_owner_iter(hir_id) {
691 if let OwnerNode::Item(&Item { kind: ItemKind::Mod(_), .. }) = node {
698 /// When on an if expression, a match arm tail expression or a match arm, give back
699 /// the enclosing `if` or `match` expression.
701 /// Used by error reporting when there's a type error in an if or match arm caused by the
702 /// expression needing to be unit.
703 pub fn get_if_cause(&self, hir_id: HirId) -> Option<&'hir Expr<'hir>> {
704 for (_, node) in self.parent_iter(hir_id) {
707 | Node::ForeignItem(_)
710 | Node::Stmt(Stmt { kind: StmtKind::Local(_), .. }) => break,
711 Node::Expr(expr @ Expr { kind: ExprKind::If(..) | ExprKind::Match(..), .. }) => {
720 /// Returns the nearest enclosing scope. A scope is roughly an item or block.
721 pub fn get_enclosing_scope(&self, hir_id: HirId) -> Option<HirId> {
722 for (hir_id, node) in self.parent_iter(hir_id) {
723 if let Node::Item(Item {
726 | ItemKind::Const(..)
727 | ItemKind::Static(..)
730 | ItemKind::Struct(..)
731 | ItemKind::Union(..)
732 | ItemKind::Trait(..)
733 | ItemKind::Impl { .. },
736 | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(..), .. })
737 | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(..), .. })
738 | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(..), .. })
739 | Node::Block(_) = node
747 /// Returns the defining scope for an opaque type definition.
748 pub fn get_defining_scope(&self, id: HirId) -> HirId {
751 scope = self.get_enclosing_scope(scope).unwrap_or(CRATE_HIR_ID);
752 if scope == CRATE_HIR_ID || !matches!(self.get(scope), Node::Block(_)) {
758 pub fn get_parent_did(&self, id: HirId) -> LocalDefId {
759 self.local_def_id(self.get_parent_item(id))
762 pub fn get_foreign_abi(&self, hir_id: HirId) -> Abi {
763 let parent = self.get_parent_item(hir_id);
764 if let Some(node) = self.tcx.hir_owner(self.local_def_id(parent)) {
765 if let OwnerNode::Item(Item { kind: ItemKind::ForeignMod { abi, .. }, .. }) = node.node
770 bug!("expected foreign mod or inlined parent, found {}", self.node_to_string(parent))
773 pub fn expect_item(&self, id: HirId) -> &'hir Item<'hir> {
774 match self.tcx.hir_owner(id.expect_owner()) {
775 Some(Owner { node: OwnerNode::Item(item) }) => item,
776 _ => bug!("expected item, found {}", self.node_to_string(id)),
780 pub fn expect_impl_item(&self, id: HirId) -> &'hir ImplItem<'hir> {
781 match self.tcx.hir_owner(id.expect_owner()) {
782 Some(Owner { node: OwnerNode::ImplItem(item) }) => item,
783 _ => bug!("expected impl item, found {}", self.node_to_string(id)),
787 pub fn expect_trait_item(&self, id: HirId) -> &'hir TraitItem<'hir> {
788 match self.tcx.hir_owner(id.expect_owner()) {
789 Some(Owner { node: OwnerNode::TraitItem(item) }) => item,
790 _ => bug!("expected trait item, found {}", self.node_to_string(id)),
794 pub fn expect_variant(&self, id: HirId) -> &'hir Variant<'hir> {
795 match self.find(id) {
796 Some(Node::Variant(variant)) => variant,
797 _ => bug!("expected variant, found {}", self.node_to_string(id)),
801 pub fn expect_foreign_item(&self, id: HirId) -> &'hir ForeignItem<'hir> {
802 match self.tcx.hir_owner(id.expect_owner()) {
803 Some(Owner { node: OwnerNode::ForeignItem(item) }) => item,
804 _ => bug!("expected foreign item, found {}", self.node_to_string(id)),
808 pub fn expect_expr(&self, id: HirId) -> &'hir Expr<'hir> {
809 match self.find(id) {
810 Some(Node::Expr(expr)) => expr,
811 _ => bug!("expected expr, found {}", self.node_to_string(id)),
815 pub fn opt_name(&self, id: HirId) -> Option<Symbol> {
816 Some(match self.get(id) {
817 Node::Item(i) => i.ident.name,
818 Node::ForeignItem(fi) => fi.ident.name,
819 Node::ImplItem(ii) => ii.ident.name,
820 Node::TraitItem(ti) => ti.ident.name,
821 Node::Variant(v) => v.ident.name,
822 Node::Field(f) => f.ident.name,
823 Node::Lifetime(lt) => lt.name.ident().name,
824 Node::GenericParam(param) => param.name.ident().name,
825 Node::Binding(&Pat { kind: PatKind::Binding(_, _, l, _), .. }) => l.name,
826 Node::Ctor(..) => self.name(self.get_parent_item(id)),
831 pub fn name(&self, id: HirId) -> Symbol {
832 match self.opt_name(id) {
834 None => bug!("no name for {}", self.node_to_string(id)),
838 /// Given a node ID, gets a list of attributes associated with the AST
839 /// corresponding to the node-ID.
840 pub fn attrs(&self, id: HirId) -> &'hir [ast::Attribute] {
841 self.tcx.hir_attrs(id.owner).get(id.local_id)
844 /// Gets the span of the definition of the specified HIR node.
845 /// This is used by `tcx.get_span`
846 pub fn span(&self, hir_id: HirId) -> Span {
847 self.opt_span(hir_id)
848 .unwrap_or_else(|| bug!("hir::map::Map::span: id not in map: {:?}", hir_id))
851 pub fn opt_span(&self, hir_id: HirId) -> Option<Span> {
852 let span = match self.find(hir_id)? {
853 Node::Param(param) => param.span,
854 Node::Item(item) => match &item.kind {
855 ItemKind::Fn(sig, _, _) => sig.span,
858 Node::ForeignItem(foreign_item) => foreign_item.span,
859 Node::TraitItem(trait_item) => match &trait_item.kind {
860 TraitItemKind::Fn(sig, _) => sig.span,
861 _ => trait_item.span,
863 Node::ImplItem(impl_item) => match &impl_item.kind {
864 ImplItemKind::Fn(sig, _) => sig.span,
867 Node::Variant(variant) => variant.span,
868 Node::Field(field) => field.span,
869 Node::AnonConst(constant) => self.body(constant.body).value.span,
870 Node::Expr(expr) => expr.span,
871 Node::Stmt(stmt) => stmt.span,
872 Node::PathSegment(seg) => seg.ident.span,
873 Node::Ty(ty) => ty.span,
874 Node::TraitRef(tr) => tr.path.span,
875 Node::Binding(pat) => pat.span,
876 Node::Pat(pat) => pat.span,
877 Node::Arm(arm) => arm.span,
878 Node::Block(block) => block.span,
879 Node::Ctor(..) => match self.find(self.get_parent_node(hir_id))? {
880 Node::Item(item) => item.span,
881 Node::Variant(variant) => variant.span,
884 Node::Lifetime(lifetime) => lifetime.span,
885 Node::GenericParam(param) => param.span,
886 Node::Visibility(&Spanned {
887 node: VisibilityKind::Restricted { ref path, .. },
890 Node::Infer(i) => i.span,
891 Node::Visibility(v) => bug!("unexpected Visibility {:?}", v),
892 Node::Local(local) => local.span,
893 Node::Crate(item) => item.inner,
898 /// Like `hir.span()`, but includes the body of function items
899 /// (instead of just the function header)
900 pub fn span_with_body(&self, hir_id: HirId) -> Span {
901 match self.find(hir_id) {
902 Some(Node::TraitItem(item)) => item.span,
903 Some(Node::ImplItem(impl_item)) => impl_item.span,
904 Some(Node::Item(item)) => item.span,
905 Some(_) => self.span(hir_id),
906 _ => bug!("hir::map::Map::span_with_body: id not in map: {:?}", hir_id),
910 pub fn span_if_local(&self, id: DefId) -> Option<Span> {
911 id.as_local().and_then(|id| self.opt_span(self.local_def_id_to_hir_id(id)))
914 pub fn res_span(&self, res: Res) -> Option<Span> {
917 Res::Local(id) => Some(self.span(id)),
918 res => self.span_if_local(res.opt_def_id()?),
922 /// Get a representation of this `id` for debugging purposes.
923 /// NOTE: Do NOT use this in diagnostics!
924 pub fn node_to_string(&self, id: HirId) -> String {
925 hir_id_to_string(self, id)
928 /// Returns the HirId of `N` in `struct Foo<const N: usize = { ... }>` when
929 /// called with the HirId for the `{ ... }` anon const
930 pub fn opt_const_param_default_param_hir_id(&self, anon_const: HirId) -> Option<HirId> {
931 match self.get(self.get_parent_node(anon_const)) {
932 Node::GenericParam(GenericParam {
934 kind: GenericParamKind::Const { .. },
936 }) => Some(*param_id),
942 impl<'hir> intravisit::Map<'hir> for Map<'hir> {
943 fn find(&self, hir_id: HirId) -> Option<Node<'hir>> {
947 fn body(&self, id: BodyId) -> &'hir Body<'hir> {
951 fn item(&self, id: ItemId) -> &'hir Item<'hir> {
955 fn trait_item(&self, id: TraitItemId) -> &'hir TraitItem<'hir> {
959 fn impl_item(&self, id: ImplItemId) -> &'hir ImplItem<'hir> {
963 fn foreign_item(&self, id: ForeignItemId) -> &'hir ForeignItem<'hir> {
964 self.foreign_item(id)
968 pub(super) fn index_hir<'tcx>(tcx: TyCtxt<'tcx>, (): ()) -> &'tcx IndexedHir<'tcx> {
969 let _prof_timer = tcx.sess.prof.generic_activity("build_hir_map");
971 // We can access untracked state since we are an eval_always query.
972 let hcx = tcx.create_stable_hashing_context();
973 let mut collector = NodeCollector::root(
977 &tcx.untracked_resolutions.definitions,
980 let top_mod = tcx.untracked_crate.module();
981 collector.visit_mod(top_mod, top_mod.inner, CRATE_HIR_ID);
983 let map = collector.finalize_and_compute_crate_hash();
987 pub(super) fn crate_hash(tcx: TyCtxt<'_>, crate_num: CrateNum) -> Svh {
988 assert_eq!(crate_num, LOCAL_CRATE);
990 // We can access untracked state since we are an eval_always query.
991 let mut hcx = tcx.create_stable_hashing_context();
993 let mut hir_body_nodes: Vec<_> = tcx
997 .filter_map(|(def_id, hod)| {
998 let def_path_hash = tcx.untracked_resolutions.definitions.def_path_hash(def_id);
999 let hash = hod.as_ref()?.hash;
1000 Some((def_path_hash, hash, def_id))
1003 hir_body_nodes.sort_unstable_by_key(|bn| bn.0);
1005 let upstream_crates = upstream_crates(tcx);
1007 // We hash the final, remapped names of all local source files so we
1008 // don't have to include the path prefix remapping commandline args.
1009 // If we included the full mapping in the SVH, we could only have
1010 // reproducible builds by compiling from the same directory. So we just
1011 // hash the result of the mapping instead of the mapping itself.
1012 let mut source_file_names: Vec<_> = tcx
1017 .filter(|source_file| source_file.cnum == LOCAL_CRATE)
1018 .map(|source_file| source_file.name_hash)
1021 source_file_names.sort_unstable();
1023 let mut stable_hasher = StableHasher::new();
1024 for (def_path_hash, fingerprint, def_id) in hir_body_nodes.iter() {
1025 def_path_hash.0.hash_stable(&mut hcx, &mut stable_hasher);
1026 fingerprint.hash_stable(&mut hcx, &mut stable_hasher);
1027 AttributeMap { map: &tcx.untracked_crate.attrs, prefix: *def_id }
1028 .hash_stable(&mut hcx, &mut stable_hasher);
1029 if tcx.sess.opts.debugging_opts.incremental_relative_spans {
1030 let span = tcx.untracked_resolutions.definitions.def_span(*def_id);
1031 debug_assert_eq!(span.parent(), None);
1032 span.hash_stable(&mut hcx, &mut stable_hasher);
1035 upstream_crates.hash_stable(&mut hcx, &mut stable_hasher);
1036 source_file_names.hash_stable(&mut hcx, &mut stable_hasher);
1037 tcx.sess.opts.dep_tracking_hash(true).hash_stable(&mut hcx, &mut stable_hasher);
1038 tcx.sess.local_stable_crate_id().hash_stable(&mut hcx, &mut stable_hasher);
1040 let crate_hash: Fingerprint = stable_hasher.finish();
1041 Svh::new(crate_hash.to_smaller_hash())
1044 fn upstream_crates(tcx: TyCtxt<'_>) -> Vec<(StableCrateId, Svh)> {
1045 let mut upstream_crates: Vec<_> = tcx
1049 let stable_crate_id = tcx.resolutions(()).cstore.stable_crate_id(cnum);
1050 let hash = tcx.crate_hash(cnum);
1051 (stable_crate_id, hash)
1054 upstream_crates.sort_unstable_by_key(|&(stable_crate_id, _)| stable_crate_id);
1058 fn hir_id_to_string(map: &Map<'_>, id: HirId) -> String {
1059 let id_str = format!(" (hir_id={})", id);
1062 // This functionality is used for debugging, try to use `TyCtxt` to get
1063 // the user-friendly path, otherwise fall back to stringifying `DefPath`.
1064 crate::ty::tls::with_opt(|tcx| {
1065 if let Some(tcx) = tcx {
1066 let def_id = map.local_def_id(id);
1067 tcx.def_path_str(def_id.to_def_id())
1068 } else if let Some(path) = map.def_path_from_hir_id(id) {
1069 path.data.into_iter().map(|elem| elem.to_string()).collect::<Vec<_>>().join("::")
1071 String::from("<missing path>")
1076 let span_str = || map.tcx.sess.source_map().span_to_snippet(map.span(id)).unwrap_or_default();
1077 let node_str = |prefix| format!("{} {}{}", prefix, span_str(), id_str);
1079 match map.find(id) {
1080 Some(Node::Item(item)) => {
1081 let item_str = match item.kind {
1082 ItemKind::ExternCrate(..) => "extern crate",
1083 ItemKind::Use(..) => "use",
1084 ItemKind::Static(..) => "static",
1085 ItemKind::Const(..) => "const",
1086 ItemKind::Fn(..) => "fn",
1087 ItemKind::Macro(..) => "macro",
1088 ItemKind::Mod(..) => "mod",
1089 ItemKind::ForeignMod { .. } => "foreign mod",
1090 ItemKind::GlobalAsm(..) => "global asm",
1091 ItemKind::TyAlias(..) => "ty",
1092 ItemKind::OpaqueTy(..) => "opaque type",
1093 ItemKind::Enum(..) => "enum",
1094 ItemKind::Struct(..) => "struct",
1095 ItemKind::Union(..) => "union",
1096 ItemKind::Trait(..) => "trait",
1097 ItemKind::TraitAlias(..) => "trait alias",
1098 ItemKind::Impl { .. } => "impl",
1100 format!("{} {}{}", item_str, path_str(), id_str)
1102 Some(Node::ForeignItem(_)) => format!("foreign item {}{}", path_str(), id_str),
1103 Some(Node::ImplItem(ii)) => match ii.kind {
1104 ImplItemKind::Const(..) => {
1105 format!("assoc const {} in {}{}", ii.ident, path_str(), id_str)
1107 ImplItemKind::Fn(..) => format!("method {} in {}{}", ii.ident, path_str(), id_str),
1108 ImplItemKind::TyAlias(_) => {
1109 format!("assoc type {} in {}{}", ii.ident, path_str(), id_str)
1112 Some(Node::TraitItem(ti)) => {
1113 let kind = match ti.kind {
1114 TraitItemKind::Const(..) => "assoc constant",
1115 TraitItemKind::Fn(..) => "trait method",
1116 TraitItemKind::Type(..) => "assoc type",
1119 format!("{} {} in {}{}", kind, ti.ident, path_str(), id_str)
1121 Some(Node::Variant(ref variant)) => {
1122 format!("variant {} in {}{}", variant.ident, path_str(), id_str)
1124 Some(Node::Field(ref field)) => {
1125 format!("field {} in {}{}", field.ident, path_str(), id_str)
1127 Some(Node::AnonConst(_)) => node_str("const"),
1128 Some(Node::Expr(_)) => node_str("expr"),
1129 Some(Node::Stmt(_)) => node_str("stmt"),
1130 Some(Node::PathSegment(_)) => node_str("path segment"),
1131 Some(Node::Ty(_)) => node_str("type"),
1132 Some(Node::TraitRef(_)) => node_str("trait ref"),
1133 Some(Node::Binding(_)) => node_str("local"),
1134 Some(Node::Pat(_)) => node_str("pat"),
1135 Some(Node::Param(_)) => node_str("param"),
1136 Some(Node::Arm(_)) => node_str("arm"),
1137 Some(Node::Block(_)) => node_str("block"),
1138 Some(Node::Infer(_)) => node_str("infer"),
1139 Some(Node::Local(_)) => node_str("local"),
1140 Some(Node::Ctor(..)) => format!("ctor {}{}", path_str(), id_str),
1141 Some(Node::Lifetime(_)) => node_str("lifetime"),
1142 Some(Node::GenericParam(ref param)) => format!("generic_param {:?}{}", param, id_str),
1143 Some(Node::Visibility(ref vis)) => format!("visibility {:?}{}", vis, id_str),
1144 Some(Node::Crate(..)) => String::from("root_crate"),
1145 None => format!("unknown node{}", id_str),
1149 pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalDefId) -> ModuleItems {
1150 let mut collector = ModuleCollector {
1152 submodules: BTreeSet::default(),
1153 items: BTreeSet::default(),
1154 trait_items: BTreeSet::default(),
1155 impl_items: BTreeSet::default(),
1156 foreign_items: BTreeSet::default(),
1159 let (hir_mod, span, hir_id) = tcx.hir().get_module(module_id);
1160 collector.visit_mod(hir_mod, span, hir_id);
1162 let ModuleCollector { submodules, items, trait_items, impl_items, foreign_items, .. } =
1164 return ModuleItems { submodules, items, trait_items, impl_items, foreign_items };
1166 struct ModuleCollector<'tcx> {
1168 submodules: BTreeSet<LocalDefId>,
1169 items: BTreeSet<ItemId>,
1170 trait_items: BTreeSet<TraitItemId>,
1171 impl_items: BTreeSet<ImplItemId>,
1172 foreign_items: BTreeSet<ForeignItemId>,
1175 impl<'hir> Visitor<'hir> for ModuleCollector<'hir> {
1176 type Map = Map<'hir>;
1178 fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap<Self::Map> {
1179 intravisit::NestedVisitorMap::All(self.tcx.hir())
1182 fn visit_item(&mut self, item: &'hir Item<'hir>) {
1183 self.items.insert(item.item_id());
1184 if let ItemKind::Mod(..) = item.kind {
1185 // If this declares another module, do not recurse inside it.
1186 self.submodules.insert(item.def_id);
1188 intravisit::walk_item(self, item)
1192 fn visit_trait_item(&mut self, item: &'hir TraitItem<'hir>) {
1193 self.trait_items.insert(item.trait_item_id());
1194 intravisit::walk_trait_item(self, item)
1197 fn visit_impl_item(&mut self, item: &'hir ImplItem<'hir>) {
1198 self.impl_items.insert(item.impl_item_id());
1199 intravisit::walk_impl_item(self, item)
1202 fn visit_foreign_item(&mut self, item: &'hir ForeignItem<'hir>) {
1203 self.foreign_items.insert(item.foreign_item_id());
1204 intravisit::walk_foreign_item(self, item)