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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
commit698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch)
tree173a775858bd501c378080a10dca74132f05bc50 /compiler/rustc_middle/src/hir
parentInitial commit. (diff)
downloadrustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz
rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'compiler/rustc_middle/src/hir')
-rw-r--r--compiler/rustc_middle/src/hir/map/mod.rs1405
-rw-r--r--compiler/rustc_middle/src/hir/mod.rs182
-rw-r--r--compiler/rustc_middle/src/hir/nested_filter.rs31
-rw-r--r--compiler/rustc_middle/src/hir/place.rs117
4 files changed, 1735 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/hir/map/mod.rs b/compiler/rustc_middle/src/hir/map/mod.rs
new file mode 100644
index 000000000..47b04c33e
--- /dev/null
+++ b/compiler/rustc_middle/src/hir/map/mod.rs
@@ -0,0 +1,1405 @@
+use crate::hir::{ModuleItems, Owner};
+use crate::ty::{DefIdTree, TyCtxt};
+use rustc_ast as ast;
+use rustc_data_structures::fingerprint::Fingerprint;
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
+use rustc_data_structures::svh::Svh;
+use rustc_data_structures::sync::{par_for_each_in, Send, Sync};
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_ID, LOCAL_CRATE};
+use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
+use rustc_hir::intravisit::{self, Visitor};
+use rustc_hir::*;
+use rustc_index::vec::Idx;
+use rustc_middle::hir::nested_filter;
+use rustc_span::def_id::StableCrateId;
+use rustc_span::symbol::{kw, sym, Ident, Symbol};
+use rustc_span::Span;
+use rustc_target::spec::abi::Abi;
+
+fn fn_decl<'hir>(node: Node<'hir>) -> Option<&'hir FnDecl<'hir>> {
+ match node {
+ Node::Item(Item { kind: ItemKind::Fn(sig, _, _), .. })
+ | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, _), .. })
+ | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, _), .. }) => Some(&sig.decl),
+ Node::Expr(Expr { kind: ExprKind::Closure(Closure { fn_decl, .. }), .. })
+ | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(fn_decl, ..), .. }) => {
+ Some(fn_decl)
+ }
+ _ => None,
+ }
+}
+
+pub fn fn_sig<'hir>(node: Node<'hir>) -> Option<&'hir FnSig<'hir>> {
+ match &node {
+ Node::Item(Item { kind: ItemKind::Fn(sig, _, _), .. })
+ | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, _), .. })
+ | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, _), .. }) => Some(sig),
+ _ => None,
+ }
+}
+
+#[inline]
+pub fn associated_body<'hir>(node: Node<'hir>) -> Option<BodyId> {
+ match node {
+ Node::Item(Item {
+ kind: ItemKind::Const(_, body) | ItemKind::Static(.., body) | ItemKind::Fn(.., body),
+ ..
+ })
+ | Node::TraitItem(TraitItem {
+ kind:
+ TraitItemKind::Const(_, Some(body)) | TraitItemKind::Fn(_, TraitFn::Provided(body)),
+ ..
+ })
+ | Node::ImplItem(ImplItem {
+ kind: ImplItemKind::Const(_, body) | ImplItemKind::Fn(_, body),
+ ..
+ })
+ | Node::Expr(Expr { kind: ExprKind::Closure(Closure { body, .. }), .. }) => Some(*body),
+
+ Node::AnonConst(constant) => Some(constant.body),
+
+ _ => None,
+ }
+}
+
+fn is_body_owner<'hir>(node: Node<'hir>, hir_id: HirId) -> bool {
+ match associated_body(node) {
+ Some(b) => b.hir_id == hir_id,
+ None => false,
+ }
+}
+
+#[derive(Copy, Clone)]
+pub struct Map<'hir> {
+ pub(super) tcx: TyCtxt<'hir>,
+}
+
+/// An iterator that walks up the ancestor tree of a given `HirId`.
+/// Constructed using `tcx.hir().parent_iter(hir_id)`.
+pub struct ParentHirIterator<'hir> {
+ current_id: HirId,
+ map: Map<'hir>,
+}
+
+impl<'hir> Iterator for ParentHirIterator<'hir> {
+ type Item = (HirId, Node<'hir>);
+
+ fn next(&mut self) -> Option<Self::Item> {
+ if self.current_id == CRATE_HIR_ID {
+ return None;
+ }
+ loop {
+ // There are nodes that do not have entries, so we need to skip them.
+ let parent_id = self.map.get_parent_node(self.current_id);
+
+ if parent_id == self.current_id {
+ self.current_id = CRATE_HIR_ID;
+ return None;
+ }
+
+ self.current_id = parent_id;
+ if let Some(node) = self.map.find(parent_id) {
+ return Some((parent_id, node));
+ }
+ // If this `HirId` doesn't have an entry, skip it and look for its `parent_id`.
+ }
+ }
+}
+
+/// An iterator that walks up the ancestor tree of a given `HirId`.
+/// Constructed using `tcx.hir().parent_owner_iter(hir_id)`.
+pub struct ParentOwnerIterator<'hir> {
+ current_id: HirId,
+ map: Map<'hir>,
+}
+
+impl<'hir> Iterator for ParentOwnerIterator<'hir> {
+ type Item = (LocalDefId, OwnerNode<'hir>);
+
+ fn next(&mut self) -> Option<Self::Item> {
+ if self.current_id.local_id.index() != 0 {
+ self.current_id.local_id = ItemLocalId::new(0);
+ if let Some(node) = self.map.tcx.hir_owner(self.current_id.owner) {
+ return Some((self.current_id.owner, node.node));
+ }
+ }
+ if self.current_id == CRATE_HIR_ID {
+ return None;
+ }
+ loop {
+ // There are nodes that do not have entries, so we need to skip them.
+ let parent_id = self.map.def_key(self.current_id.owner).parent;
+
+ let parent_id = parent_id.map_or(CRATE_HIR_ID.owner, |local_def_index| {
+ let def_id = LocalDefId { local_def_index };
+ self.map.local_def_id_to_hir_id(def_id).owner
+ });
+ self.current_id = HirId::make_owner(parent_id);
+
+ // If this `HirId` doesn't have an entry, skip it and look for its `parent_id`.
+ if let Some(node) = self.map.tcx.hir_owner(self.current_id.owner) {
+ return Some((self.current_id.owner, node.node));
+ }
+ }
+ }
+}
+
+impl<'hir> Map<'hir> {
+ pub fn krate(self) -> &'hir Crate<'hir> {
+ self.tcx.hir_crate(())
+ }
+
+ pub fn root_module(self) -> &'hir Mod<'hir> {
+ match self.tcx.hir_owner(CRATE_DEF_ID).map(|o| o.node) {
+ Some(OwnerNode::Crate(item)) => item,
+ _ => bug!(),
+ }
+ }
+
+ pub fn items(self) -> impl Iterator<Item = ItemId> + 'hir {
+ self.tcx.hir_crate_items(()).items.iter().copied()
+ }
+
+ pub fn module_items(self, module: LocalDefId) -> impl Iterator<Item = ItemId> + 'hir {
+ self.tcx.hir_module_items(module).items()
+ }
+
+ pub fn par_for_each_item(self, f: impl Fn(ItemId) + Sync + Send) {
+ par_for_each_in(&self.tcx.hir_crate_items(()).items[..], |id| f(*id));
+ }
+
+ pub fn def_key(self, def_id: LocalDefId) -> DefKey {
+ // Accessing the DefKey is ok, since it is part of DefPathHash.
+ self.tcx.definitions_untracked().def_key(def_id)
+ }
+
+ pub fn def_path_from_hir_id(self, id: HirId) -> Option<DefPath> {
+ self.opt_local_def_id(id).map(|def_id| self.def_path(def_id))
+ }
+
+ pub fn def_path(self, def_id: LocalDefId) -> DefPath {
+ // Accessing the DefPath is ok, since it is part of DefPathHash.
+ self.tcx.definitions_untracked().def_path(def_id)
+ }
+
+ #[inline]
+ pub fn def_path_hash(self, def_id: LocalDefId) -> DefPathHash {
+ // Accessing the DefPathHash is ok, it is incr. comp. stable.
+ self.tcx.definitions_untracked().def_path_hash(def_id)
+ }
+
+ #[inline]
+ pub fn local_def_id(self, hir_id: HirId) -> LocalDefId {
+ self.opt_local_def_id(hir_id).unwrap_or_else(|| {
+ bug!(
+ "local_def_id: no entry for `{:?}`, which has a map of `{:?}`",
+ hir_id,
+ self.find(hir_id)
+ )
+ })
+ }
+
+ #[inline]
+ pub fn opt_local_def_id(self, hir_id: HirId) -> Option<LocalDefId> {
+ if hir_id.local_id == ItemLocalId::new(0) {
+ Some(hir_id.owner)
+ } else {
+ self.tcx
+ .hir_owner_nodes(hir_id.owner)
+ .as_owner()?
+ .local_id_to_def_id
+ .get(&hir_id.local_id)
+ .copied()
+ }
+ }
+
+ #[inline]
+ pub fn local_def_id_to_hir_id(self, def_id: LocalDefId) -> HirId {
+ self.tcx.local_def_id_to_hir_id(def_id)
+ }
+
+ /// Do not call this function directly. The query should be called.
+ pub(super) fn opt_def_kind(self, local_def_id: LocalDefId) -> Option<DefKind> {
+ let hir_id = self.local_def_id_to_hir_id(local_def_id);
+ let def_kind = match self.find(hir_id)? {
+ Node::Item(item) => match item.kind {
+ ItemKind::Static(_, mt, _) => DefKind::Static(mt),
+ ItemKind::Const(..) => DefKind::Const,
+ ItemKind::Fn(..) => DefKind::Fn,
+ ItemKind::Macro(_, macro_kind) => DefKind::Macro(macro_kind),
+ ItemKind::Mod(..) => DefKind::Mod,
+ ItemKind::OpaqueTy(..) => DefKind::OpaqueTy,
+ ItemKind::TyAlias(..) => DefKind::TyAlias,
+ ItemKind::Enum(..) => DefKind::Enum,
+ ItemKind::Struct(..) => DefKind::Struct,
+ ItemKind::Union(..) => DefKind::Union,
+ ItemKind::Trait(..) => DefKind::Trait,
+ ItemKind::TraitAlias(..) => DefKind::TraitAlias,
+ ItemKind::ExternCrate(_) => DefKind::ExternCrate,
+ ItemKind::Use(..) => DefKind::Use,
+ ItemKind::ForeignMod { .. } => DefKind::ForeignMod,
+ ItemKind::GlobalAsm(..) => DefKind::GlobalAsm,
+ ItemKind::Impl { .. } => DefKind::Impl,
+ },
+ Node::ForeignItem(item) => match item.kind {
+ ForeignItemKind::Fn(..) => DefKind::Fn,
+ ForeignItemKind::Static(_, mt) => DefKind::Static(mt),
+ ForeignItemKind::Type => DefKind::ForeignTy,
+ },
+ Node::TraitItem(item) => match item.kind {
+ TraitItemKind::Const(..) => DefKind::AssocConst,
+ TraitItemKind::Fn(..) => DefKind::AssocFn,
+ TraitItemKind::Type(..) => DefKind::AssocTy,
+ },
+ Node::ImplItem(item) => match item.kind {
+ ImplItemKind::Const(..) => DefKind::AssocConst,
+ ImplItemKind::Fn(..) => DefKind::AssocFn,
+ ImplItemKind::TyAlias(..) => DefKind::AssocTy,
+ },
+ Node::Variant(_) => DefKind::Variant,
+ Node::Ctor(variant_data) => {
+ // FIXME(eddyb) is this even possible, if we have a `Node::Ctor`?
+ assert_ne!(variant_data.ctor_hir_id(), None);
+
+ let ctor_of = match self.find(self.get_parent_node(hir_id)) {
+ Some(Node::Item(..)) => def::CtorOf::Struct,
+ Some(Node::Variant(..)) => def::CtorOf::Variant,
+ _ => unreachable!(),
+ };
+ DefKind::Ctor(ctor_of, def::CtorKind::from_hir(variant_data))
+ }
+ Node::AnonConst(_) => {
+ let inline = match self.find(self.get_parent_node(hir_id)) {
+ Some(Node::Expr(&Expr {
+ kind: ExprKind::ConstBlock(ref anon_const), ..
+ })) if anon_const.hir_id == hir_id => true,
+ _ => false,
+ };
+ if inline { DefKind::InlineConst } else { DefKind::AnonConst }
+ }
+ Node::Field(_) => DefKind::Field,
+ Node::Expr(expr) => match expr.kind {
+ ExprKind::Closure(Closure { movability: None, .. }) => DefKind::Closure,
+ ExprKind::Closure(Closure { movability: Some(_), .. }) => DefKind::Generator,
+ _ => bug!("def_kind: unsupported node: {}", self.node_to_string(hir_id)),
+ },
+ Node::GenericParam(param) => match param.kind {
+ GenericParamKind::Lifetime { .. } => DefKind::LifetimeParam,
+ GenericParamKind::Type { .. } => DefKind::TyParam,
+ GenericParamKind::Const { .. } => DefKind::ConstParam,
+ },
+ Node::Crate(_) => DefKind::Mod,
+ Node::Stmt(_)
+ | Node::PathSegment(_)
+ | Node::Ty(_)
+ | Node::TypeBinding(_)
+ | Node::Infer(_)
+ | Node::TraitRef(_)
+ | Node::Pat(_)
+ | Node::Local(_)
+ | Node::Param(_)
+ | Node::Arm(_)
+ | Node::Lifetime(_)
+ | Node::Block(_) => return None,
+ };
+ Some(def_kind)
+ }
+
+ pub fn find_parent_node(self, id: HirId) -> Option<HirId> {
+ if id.local_id == ItemLocalId::from_u32(0) {
+ Some(self.tcx.hir_owner_parent(id.owner))
+ } else {
+ let owner = self.tcx.hir_owner_nodes(id.owner).as_owner()?;
+ let node = owner.nodes[id.local_id].as_ref()?;
+ let hir_id = HirId { owner: id.owner, local_id: node.parent };
+ Some(hir_id)
+ }
+ }
+
+ pub fn get_parent_node(self, hir_id: HirId) -> HirId {
+ self.find_parent_node(hir_id)
+ .unwrap_or_else(|| bug!("No parent for node {:?}", self.node_to_string(hir_id)))
+ }
+
+ /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found.
+ pub fn find(self, id: HirId) -> Option<Node<'hir>> {
+ if id.local_id == ItemLocalId::from_u32(0) {
+ let owner = self.tcx.hir_owner(id.owner)?;
+ Some(owner.node.into())
+ } else {
+ let owner = self.tcx.hir_owner_nodes(id.owner).as_owner()?;
+ let node = owner.nodes[id.local_id].as_ref()?;
+ Some(node.node)
+ }
+ }
+
+ /// Retrieves the `Node` corresponding to `id`, returning `None` if cannot be found.
+ #[inline]
+ pub fn find_by_def_id(self, id: LocalDefId) -> Option<Node<'hir>> {
+ self.find(self.local_def_id_to_hir_id(id))
+ }
+
+ /// Retrieves the `Node` corresponding to `id`, panicking if it cannot be found.
+ pub fn get(self, id: HirId) -> Node<'hir> {
+ self.find(id).unwrap_or_else(|| bug!("couldn't find hir id {} in the HIR map", id))
+ }
+
+ /// Retrieves the `Node` corresponding to `id`, panicking if it cannot be found.
+ #[inline]
+ pub fn get_by_def_id(self, id: LocalDefId) -> Node<'hir> {
+ self.find_by_def_id(id).unwrap_or_else(|| bug!("couldn't find {:?} in the HIR map", id))
+ }
+
+ pub fn get_if_local(self, id: DefId) -> Option<Node<'hir>> {
+ id.as_local().and_then(|id| self.find(self.local_def_id_to_hir_id(id)))
+ }
+
+ pub fn get_generics(self, id: LocalDefId) -> Option<&'hir Generics<'hir>> {
+ let node = self.tcx.hir_owner(id)?;
+ node.node.generics()
+ }
+
+ pub fn item(self, id: ItemId) -> &'hir Item<'hir> {
+ self.tcx.hir_owner(id.def_id).unwrap().node.expect_item()
+ }
+
+ pub fn trait_item(self, id: TraitItemId) -> &'hir TraitItem<'hir> {
+ self.tcx.hir_owner(id.def_id).unwrap().node.expect_trait_item()
+ }
+
+ pub fn impl_item(self, id: ImplItemId) -> &'hir ImplItem<'hir> {
+ self.tcx.hir_owner(id.def_id).unwrap().node.expect_impl_item()
+ }
+
+ pub fn foreign_item(self, id: ForeignItemId) -> &'hir ForeignItem<'hir> {
+ self.tcx.hir_owner(id.def_id).unwrap().node.expect_foreign_item()
+ }
+
+ pub fn body(self, id: BodyId) -> &'hir Body<'hir> {
+ self.tcx.hir_owner_nodes(id.hir_id.owner).unwrap().bodies[&id.hir_id.local_id]
+ }
+
+ pub fn fn_decl_by_hir_id(self, hir_id: HirId) -> Option<&'hir FnDecl<'hir>> {
+ if let Some(node) = self.find(hir_id) {
+ fn_decl(node)
+ } else {
+ bug!("no node for hir_id `{}`", hir_id)
+ }
+ }
+
+ pub fn fn_sig_by_hir_id(self, hir_id: HirId) -> Option<&'hir FnSig<'hir>> {
+ if let Some(node) = self.find(hir_id) {
+ fn_sig(node)
+ } else {
+ bug!("no node for hir_id `{}`", hir_id)
+ }
+ }
+
+ pub fn enclosing_body_owner(self, hir_id: HirId) -> LocalDefId {
+ for (parent, _) in self.parent_iter(hir_id) {
+ if let Some(body) = self.find(parent).map(associated_body).flatten() {
+ return self.body_owner_def_id(body);
+ }
+ }
+
+ bug!("no `enclosing_body_owner` for hir_id `{}`", hir_id);
+ }
+
+ /// Returns the `HirId` that corresponds to the definition of
+ /// which this is the body of, i.e., a `fn`, `const` or `static`
+ /// item (possibly associated), a closure, or a `hir::AnonConst`.
+ pub fn body_owner(self, BodyId { hir_id }: BodyId) -> HirId {
+ let parent = self.get_parent_node(hir_id);
+ assert!(self.find(parent).map_or(false, |n| is_body_owner(n, hir_id)));
+ parent
+ }
+
+ pub fn body_owner_def_id(self, id: BodyId) -> LocalDefId {
+ self.local_def_id(self.body_owner(id))
+ }
+
+ /// Given a `LocalDefId`, returns the `BodyId` associated with it,
+ /// if the node is a body owner, otherwise returns `None`.
+ pub fn maybe_body_owned_by(self, id: LocalDefId) -> Option<BodyId> {
+ self.get_if_local(id.to_def_id()).map(associated_body).flatten()
+ }
+
+ /// Given a body owner's id, returns the `BodyId` associated with it.
+ pub fn body_owned_by(self, id: LocalDefId) -> BodyId {
+ self.maybe_body_owned_by(id).unwrap_or_else(|| {
+ let hir_id = self.local_def_id_to_hir_id(id);
+ span_bug!(
+ self.span(hir_id),
+ "body_owned_by: {} has no associated body",
+ self.node_to_string(hir_id)
+ );
+ })
+ }
+
+ pub fn body_param_names(self, id: BodyId) -> impl Iterator<Item = Ident> + 'hir {
+ self.body(id).params.iter().map(|arg| match arg.pat.kind {
+ PatKind::Binding(_, _, ident, _) => ident,
+ _ => Ident::empty(),
+ })
+ }
+
+ /// Returns the `BodyOwnerKind` of this `LocalDefId`.
+ ///
+ /// Panics if `LocalDefId` does not have an associated body.
+ pub fn body_owner_kind(self, def_id: LocalDefId) -> BodyOwnerKind {
+ match self.tcx.def_kind(def_id) {
+ DefKind::Const | DefKind::AssocConst | DefKind::InlineConst | DefKind::AnonConst => {
+ BodyOwnerKind::Const
+ }
+ DefKind::Ctor(..) | DefKind::Fn | DefKind::AssocFn => BodyOwnerKind::Fn,
+ DefKind::Closure | DefKind::Generator => BodyOwnerKind::Closure,
+ DefKind::Static(mt) => BodyOwnerKind::Static(mt),
+ dk => bug!("{:?} is not a body node: {:?}", def_id, dk),
+ }
+ }
+
+ /// Returns the `ConstContext` of the body associated with this `LocalDefId`.
+ ///
+ /// Panics if `LocalDefId` does not have an associated body.
+ ///
+ /// This should only be used for determining the context of a body, a return
+ /// value of `Some` does not always suggest that the owner of the body is `const`,
+ /// just that it has to be checked as if it were.
+ pub fn body_const_context(self, def_id: LocalDefId) -> Option<ConstContext> {
+ let ccx = match self.body_owner_kind(def_id) {
+ BodyOwnerKind::Const => ConstContext::Const,
+ BodyOwnerKind::Static(mt) => ConstContext::Static(mt),
+
+ BodyOwnerKind::Fn if self.tcx.is_constructor(def_id.to_def_id()) => return None,
+ BodyOwnerKind::Fn if self.tcx.is_const_fn_raw(def_id.to_def_id()) => {
+ ConstContext::ConstFn
+ }
+ BodyOwnerKind::Fn if self.tcx.is_const_default_method(def_id.to_def_id()) => {
+ ConstContext::ConstFn
+ }
+ BodyOwnerKind::Fn | BodyOwnerKind::Closure => return None,
+ };
+
+ Some(ccx)
+ }
+
+ /// Returns an iterator of the `DefId`s for all body-owners in this
+ /// crate. If you would prefer to iterate over the bodies
+ /// themselves, you can do `self.hir().krate().body_ids.iter()`.
+ pub fn body_owners(self) -> impl Iterator<Item = LocalDefId> + 'hir {
+ self.tcx.hir_crate_items(()).body_owners.iter().copied()
+ }
+
+ pub fn par_body_owners<F: Fn(LocalDefId) + Sync + Send>(self, f: F) {
+ par_for_each_in(&self.tcx.hir_crate_items(()).body_owners[..], |&def_id| f(def_id));
+ }
+
+ pub fn ty_param_owner(self, def_id: LocalDefId) -> LocalDefId {
+ let def_kind = self.tcx.def_kind(def_id);
+ match def_kind {
+ DefKind::Trait | DefKind::TraitAlias => def_id,
+ DefKind::TyParam | DefKind::ConstParam => self.tcx.local_parent(def_id),
+ _ => bug!("ty_param_owner: {:?} is a {:?} not a type parameter", def_id, def_kind),
+ }
+ }
+
+ pub fn ty_param_name(self, def_id: LocalDefId) -> Symbol {
+ let def_kind = self.tcx.def_kind(def_id);
+ match def_kind {
+ DefKind::Trait | DefKind::TraitAlias => kw::SelfUpper,
+ DefKind::TyParam | DefKind::ConstParam => self.tcx.item_name(def_id.to_def_id()),
+ _ => bug!("ty_param_name: {:?} is a {:?} not a type parameter", def_id, def_kind),
+ }
+ }
+
+ pub fn trait_impls(self, trait_did: DefId) -> &'hir [LocalDefId] {
+ self.tcx.all_local_trait_impls(()).get(&trait_did).map_or(&[], |xs| &xs[..])
+ }
+
+ /// Gets the attributes on the crate. This is preferable to
+ /// invoking `krate.attrs` because it registers a tighter
+ /// dep-graph access.
+ pub fn krate_attrs(self) -> &'hir [ast::Attribute] {
+ self.attrs(CRATE_HIR_ID)
+ }
+
+ pub fn rustc_coherence_is_core(self) -> bool {
+ self.krate_attrs().iter().any(|attr| attr.has_name(sym::rustc_coherence_is_core))
+ }
+
+ pub fn get_module(self, module: LocalDefId) -> (&'hir Mod<'hir>, Span, HirId) {
+ let hir_id = HirId::make_owner(module);
+ match self.tcx.hir_owner(module).map(|o| o.node) {
+ Some(OwnerNode::Item(&Item { span, kind: ItemKind::Mod(ref m), .. })) => {
+ (m, span, hir_id)
+ }
+ Some(OwnerNode::Crate(item)) => (item, item.spans.inner_span, hir_id),
+ node => panic!("not a module: {:?}", node),
+ }
+ }
+
+ /// Walks the contents of the local crate. See also `visit_all_item_likes_in_crate`.
+ pub fn walk_toplevel_module(self, visitor: &mut impl Visitor<'hir>) {
+ let (top_mod, span, hir_id) = self.get_module(CRATE_DEF_ID);
+ visitor.visit_mod(top_mod, span, hir_id);
+ }
+
+ /// Walks the attributes in a crate.
+ pub fn walk_attributes(self, visitor: &mut impl Visitor<'hir>) {
+ let krate = self.krate();
+ for info in krate.owners.iter() {
+ if let MaybeOwner::Owner(info) = info {
+ for attrs in info.attrs.map.values() {
+ for a in *attrs {
+ visitor.visit_attribute(a)
+ }
+ }
+ }
+ }
+ }
+
+ /// Visits all item-likes in the crate in some deterministic (but unspecified) order. If you
+ /// need to process every item-like, and don't care about visiting nested items in a particular
+ /// order then this method is the best choice. If you do care about this nesting, you should
+ /// use the `tcx.hir().walk_toplevel_module`.
+ ///
+ /// Note that this function will access HIR for all the item-likes in the crate. If you only
+ /// need to access some of them, it is usually better to manually loop on the iterators
+ /// provided by `tcx.hir_crate_items(())`.
+ ///
+ /// Please see the notes in `intravisit.rs` for more information.
+ pub fn visit_all_item_likes_in_crate<V>(self, visitor: &mut V)
+ where
+ V: Visitor<'hir>,
+ {
+ let krate = self.tcx.hir_crate_items(());
+
+ for id in krate.items() {
+ visitor.visit_item(self.item(id));
+ }
+
+ for id in krate.trait_items() {
+ visitor.visit_trait_item(self.trait_item(id));
+ }
+
+ for id in krate.impl_items() {
+ visitor.visit_impl_item(self.impl_item(id));
+ }
+
+ for id in krate.foreign_items() {
+ visitor.visit_foreign_item(self.foreign_item(id));
+ }
+ }
+
+ /// This method is the equivalent of `visit_all_item_likes_in_crate` but restricted to
+ /// item-likes in a single module.
+ pub fn visit_item_likes_in_module<V>(self, module: LocalDefId, visitor: &mut V)
+ where
+ V: Visitor<'hir>,
+ {
+ let module = self.tcx.hir_module_items(module);
+
+ for id in module.items() {
+ visitor.visit_item(self.item(id));
+ }
+
+ for id in module.trait_items() {
+ visitor.visit_trait_item(self.trait_item(id));
+ }
+
+ for id in module.impl_items() {
+ visitor.visit_impl_item(self.impl_item(id));
+ }
+
+ for id in module.foreign_items() {
+ visitor.visit_foreign_item(self.foreign_item(id));
+ }
+ }
+
+ pub fn for_each_module(self, mut f: impl FnMut(LocalDefId)) {
+ let crate_items = self.tcx.hir_crate_items(());
+ for module in crate_items.submodules.iter() {
+ f(*module)
+ }
+ }
+
+ #[cfg(not(parallel_compiler))]
+ #[inline]
+ pub fn par_for_each_module(self, f: impl Fn(LocalDefId)) {
+ self.for_each_module(f)
+ }
+
+ #[cfg(parallel_compiler)]
+ pub fn par_for_each_module(self, f: impl Fn(LocalDefId) + Sync) {
+ use rustc_data_structures::sync::{par_iter, ParallelIterator};
+ par_iter_submodules(self.tcx, CRATE_DEF_ID, &f);
+
+ fn par_iter_submodules<F>(tcx: TyCtxt<'_>, module: LocalDefId, f: &F)
+ where
+ F: Fn(LocalDefId) + Sync,
+ {
+ (*f)(module);
+ let items = tcx.hir_module_items(module);
+ par_iter(&items.submodules[..]).for_each(|&sm| par_iter_submodules(tcx, sm, f));
+ }
+ }
+
+ /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
+ /// until the crate root is reached. Prefer this over your own loop using `get_parent_node`.
+ pub fn parent_iter(self, current_id: HirId) -> ParentHirIterator<'hir> {
+ ParentHirIterator { current_id, map: self }
+ }
+
+ /// Returns an iterator for the nodes in the ancestor tree of the `current_id`
+ /// until the crate root is reached. Prefer this over your own loop using `get_parent_node`.
+ pub fn parent_owner_iter(self, current_id: HirId) -> ParentOwnerIterator<'hir> {
+ ParentOwnerIterator { current_id, map: self }
+ }
+
+ /// Checks if the node is left-hand side of an assignment.
+ pub fn is_lhs(self, id: HirId) -> bool {
+ match self.find(self.get_parent_node(id)) {
+ Some(Node::Expr(expr)) => match expr.kind {
+ ExprKind::Assign(lhs, _rhs, _span) => lhs.hir_id == id,
+ _ => false,
+ },
+ _ => false,
+ }
+ }
+
+ /// Whether the expression pointed at by `hir_id` belongs to a `const` evaluation context.
+ /// Used exclusively for diagnostics, to avoid suggestion function calls.
+ pub fn is_inside_const_context(self, hir_id: HirId) -> bool {
+ self.body_const_context(self.enclosing_body_owner(hir_id)).is_some()
+ }
+
+ /// Retrieves the `HirId` for `id`'s enclosing method, unless there's a
+ /// `while` or `loop` before reaching it, as block tail returns are not
+ /// available in them.
+ ///
+ /// ```
+ /// fn foo(x: usize) -> bool {
+ /// if x == 1 {
+ /// true // If `get_return_block` gets passed the `id` corresponding
+ /// } else { // to this, it will return `foo`'s `HirId`.
+ /// false
+ /// }
+ /// }
+ /// ```
+ ///
+ /// ```compile_fail,E0308
+ /// fn foo(x: usize) -> bool {
+ /// loop {
+ /// true // If `get_return_block` gets passed the `id` corresponding
+ /// } // to this, it will return `None`.
+ /// false
+ /// }
+ /// ```
+ pub fn get_return_block(self, id: HirId) -> Option<HirId> {
+ let mut iter = self.parent_iter(id).peekable();
+ let mut ignore_tail = false;
+ if let Some(node) = self.find(id) {
+ if let Node::Expr(Expr { kind: ExprKind::Ret(_), .. }) = node {
+ // When dealing with `return` statements, we don't care about climbing only tail
+ // expressions.
+ ignore_tail = true;
+ }
+ }
+ while let Some((hir_id, node)) = iter.next() {
+ if let (Some((_, next_node)), false) = (iter.peek(), ignore_tail) {
+ match next_node {
+ Node::Block(Block { expr: None, .. }) => return None,
+ // The current node is not the tail expression of its parent.
+ Node::Block(Block { expr: Some(e), .. }) if hir_id != e.hir_id => return None,
+ _ => {}
+ }
+ }
+ match node {
+ Node::Item(_)
+ | Node::ForeignItem(_)
+ | Node::TraitItem(_)
+ | Node::Expr(Expr { kind: ExprKind::Closure { .. }, .. })
+ | Node::ImplItem(_) => return Some(hir_id),
+ // Ignore `return`s on the first iteration
+ Node::Expr(Expr { kind: ExprKind::Loop(..) | ExprKind::Ret(..), .. })
+ | Node::Local(_) => {
+ return None;
+ }
+ _ => {}
+ }
+ }
+ None
+ }
+
+ /// Retrieves the `HirId` for `id`'s parent item, or `id` itself if no
+ /// parent item is in this map. The "parent item" is the closest parent node
+ /// in the HIR which is recorded by the map and is an item, either an item
+ /// in a module, trait, or impl.
+ pub fn get_parent_item(self, hir_id: HirId) -> LocalDefId {
+ if let Some((def_id, _node)) = self.parent_owner_iter(hir_id).next() {
+ def_id
+ } else {
+ CRATE_DEF_ID
+ }
+ }
+
+ /// Returns the `HirId` of `id`'s nearest module parent, or `id` itself if no
+ /// module parent is in this map.
+ pub(super) fn get_module_parent_node(self, hir_id: HirId) -> LocalDefId {
+ for (def_id, node) in self.parent_owner_iter(hir_id) {
+ if let OwnerNode::Item(&Item { kind: ItemKind::Mod(_), .. }) = node {
+ return def_id;
+ }
+ }
+ CRATE_DEF_ID
+ }
+
+ /// When on an if expression, a match arm tail expression or a match arm, give back
+ /// the enclosing `if` or `match` expression.
+ ///
+ /// Used by error reporting when there's a type error in an if or match arm caused by the
+ /// expression needing to be unit.
+ pub fn get_if_cause(self, hir_id: HirId) -> Option<&'hir Expr<'hir>> {
+ for (_, node) in self.parent_iter(hir_id) {
+ match node {
+ Node::Item(_)
+ | Node::ForeignItem(_)
+ | Node::TraitItem(_)
+ | Node::ImplItem(_)
+ | Node::Stmt(Stmt { kind: StmtKind::Local(_), .. }) => break,
+ Node::Expr(expr @ Expr { kind: ExprKind::If(..) | ExprKind::Match(..), .. }) => {
+ return Some(expr);
+ }
+ _ => {}
+ }
+ }
+ None
+ }
+
+ /// Returns the nearest enclosing scope. A scope is roughly an item or block.
+ pub fn get_enclosing_scope(self, hir_id: HirId) -> Option<HirId> {
+ for (hir_id, node) in self.parent_iter(hir_id) {
+ if let Node::Item(Item {
+ kind:
+ ItemKind::Fn(..)
+ | ItemKind::Const(..)
+ | ItemKind::Static(..)
+ | ItemKind::Mod(..)
+ | ItemKind::Enum(..)
+ | ItemKind::Struct(..)
+ | ItemKind::Union(..)
+ | ItemKind::Trait(..)
+ | ItemKind::Impl { .. },
+ ..
+ })
+ | Node::ForeignItem(ForeignItem { kind: ForeignItemKind::Fn(..), .. })
+ | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(..), .. })
+ | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(..), .. })
+ | Node::Block(_) = node
+ {
+ return Some(hir_id);
+ }
+ }
+ None
+ }
+
+ /// Returns the defining scope for an opaque type definition.
+ pub fn get_defining_scope(self, id: HirId) -> HirId {
+ let mut scope = id;
+ loop {
+ scope = self.get_enclosing_scope(scope).unwrap_or(CRATE_HIR_ID);
+ if scope == CRATE_HIR_ID || !matches!(self.get(scope), Node::Block(_)) {
+ return scope;
+ }
+ }
+ }
+
+ pub fn get_foreign_abi(self, hir_id: HirId) -> Abi {
+ let parent = self.get_parent_item(hir_id);
+ if let Some(node) = self.tcx.hir_owner(parent) {
+ if let OwnerNode::Item(Item { kind: ItemKind::ForeignMod { abi, .. }, .. }) = node.node
+ {
+ return *abi;
+ }
+ }
+ bug!(
+ "expected foreign mod or inlined parent, found {}",
+ self.node_to_string(HirId::make_owner(parent))
+ )
+ }
+
+ pub fn expect_owner(self, id: LocalDefId) -> OwnerNode<'hir> {
+ self.tcx.hir_owner(id).unwrap_or_else(|| bug!("expected owner for {:?}", id)).node
+ }
+
+ pub fn expect_item(self, id: LocalDefId) -> &'hir Item<'hir> {
+ match self.tcx.hir_owner(id) {
+ Some(Owner { node: OwnerNode::Item(item), .. }) => item,
+ _ => bug!("expected item, found {}", self.node_to_string(HirId::make_owner(id))),
+ }
+ }
+
+ pub fn expect_impl_item(self, id: LocalDefId) -> &'hir ImplItem<'hir> {
+ match self.tcx.hir_owner(id) {
+ Some(Owner { node: OwnerNode::ImplItem(item), .. }) => item,
+ _ => bug!("expected impl item, found {}", self.node_to_string(HirId::make_owner(id))),
+ }
+ }
+
+ pub fn expect_trait_item(self, id: LocalDefId) -> &'hir TraitItem<'hir> {
+ match self.tcx.hir_owner(id) {
+ Some(Owner { node: OwnerNode::TraitItem(item), .. }) => item,
+ _ => bug!("expected trait item, found {}", self.node_to_string(HirId::make_owner(id))),
+ }
+ }
+
+ pub fn expect_variant(self, id: HirId) -> &'hir Variant<'hir> {
+ match self.find(id) {
+ Some(Node::Variant(variant)) => variant,
+ _ => bug!("expected variant, found {}", self.node_to_string(id)),
+ }
+ }
+
+ pub fn expect_foreign_item(self, id: LocalDefId) -> &'hir ForeignItem<'hir> {
+ match self.tcx.hir_owner(id) {
+ Some(Owner { node: OwnerNode::ForeignItem(item), .. }) => item,
+ _ => {
+ bug!("expected foreign item, found {}", self.node_to_string(HirId::make_owner(id)))
+ }
+ }
+ }
+
+ pub fn expect_expr(self, id: HirId) -> &'hir Expr<'hir> {
+ match self.find(id) {
+ Some(Node::Expr(expr)) => expr,
+ _ => bug!("expected expr, found {}", self.node_to_string(id)),
+ }
+ }
+
+ #[inline]
+ fn opt_ident(self, id: HirId) -> Option<Ident> {
+ match self.get(id) {
+ Node::Pat(&Pat { kind: PatKind::Binding(_, _, ident, _), .. }) => Some(ident),
+ // A `Ctor` doesn't have an identifier itself, but its parent
+ // struct/variant does. Compare with `hir::Map::opt_span`.
+ Node::Ctor(..) => match self.find(self.get_parent_node(id))? {
+ Node::Item(item) => Some(item.ident),
+ Node::Variant(variant) => Some(variant.ident),
+ _ => unreachable!(),
+ },
+ node => node.ident(),
+ }
+ }
+
+ #[inline]
+ pub(super) fn opt_ident_span(self, id: HirId) -> Option<Span> {
+ self.opt_ident(id).map(|ident| ident.span)
+ }
+
+ #[inline]
+ pub fn opt_name(self, id: HirId) -> Option<Symbol> {
+ self.opt_ident(id).map(|ident| ident.name)
+ }
+
+ pub fn name(self, id: HirId) -> Symbol {
+ self.opt_name(id).unwrap_or_else(|| bug!("no name for {}", self.node_to_string(id)))
+ }
+
+ /// Given a node ID, gets a list of attributes associated with the AST
+ /// corresponding to the node-ID.
+ pub fn attrs(self, id: HirId) -> &'hir [ast::Attribute] {
+ self.tcx.hir_attrs(id.owner).get(id.local_id)
+ }
+
+ /// Gets the span of the definition of the specified HIR node.
+ /// This is used by `tcx.def_span`.
+ pub fn span(self, hir_id: HirId) -> Span {
+ self.opt_span(hir_id)
+ .unwrap_or_else(|| bug!("hir::map::Map::span: id not in map: {:?}", hir_id))
+ }
+
+ pub fn opt_span(self, hir_id: HirId) -> Option<Span> {
+ fn until_within(outer: Span, end: Span) -> Span {
+ if let Some(end) = end.find_ancestor_inside(outer) {
+ outer.with_hi(end.hi())
+ } else {
+ outer
+ }
+ }
+
+ fn named_span(item_span: Span, ident: Ident, generics: Option<&Generics<'_>>) -> Span {
+ if ident.name != kw::Empty {
+ let mut span = until_within(item_span, ident.span);
+ if let Some(g) = generics
+ && !g.span.is_dummy()
+ && let Some(g_span) = g.span.find_ancestor_inside(item_span)
+ {
+ span = span.to(g_span);
+ }
+ span
+ } else {
+ item_span
+ }
+ }
+
+ let span = match self.find(hir_id)? {
+ // Function-like.
+ Node::Item(Item { kind: ItemKind::Fn(sig, ..), .. })
+ | Node::TraitItem(TraitItem { kind: TraitItemKind::Fn(sig, ..), .. })
+ | Node::ImplItem(ImplItem { kind: ImplItemKind::Fn(sig, ..), .. }) => sig.span,
+ // Constants and Statics.
+ Node::Item(Item {
+ kind:
+ ItemKind::Const(ty, ..)
+ | ItemKind::Static(ty, ..)
+ | ItemKind::Impl(Impl { self_ty: ty, .. }),
+ span: outer_span,
+ ..
+ })
+ | Node::TraitItem(TraitItem {
+ kind: TraitItemKind::Const(ty, ..),
+ span: outer_span,
+ ..
+ })
+ | Node::ImplItem(ImplItem {
+ kind: ImplItemKind::Const(ty, ..),
+ span: outer_span,
+ ..
+ })
+ | Node::ForeignItem(ForeignItem {
+ kind: ForeignItemKind::Static(ty, ..),
+ span: outer_span,
+ ..
+ }) => until_within(*outer_span, ty.span),
+ // With generics and bounds.
+ Node::Item(Item {
+ kind: ItemKind::Trait(_, _, generics, bounds, _),
+ span: outer_span,
+ ..
+ })
+ | Node::TraitItem(TraitItem {
+ kind: TraitItemKind::Type(bounds, _),
+ generics,
+ span: outer_span,
+ ..
+ }) => {
+ let end = if let Some(b) = bounds.last() { b.span() } else { generics.span };
+ until_within(*outer_span, end)
+ }
+ // Other cases.
+ Node::Item(item) => match &item.kind {
+ ItemKind::Use(path, _) => path.span,
+ _ => named_span(item.span, item.ident, item.kind.generics()),
+ },
+ Node::Variant(variant) => named_span(variant.span, variant.ident, None),
+ Node::ImplItem(item) => named_span(item.span, item.ident, Some(item.generics)),
+ Node::ForeignItem(item) => match item.kind {
+ ForeignItemKind::Fn(decl, _, _) => until_within(item.span, decl.output.span()),
+ _ => named_span(item.span, item.ident, None),
+ },
+ Node::Ctor(_) => return self.opt_span(self.get_parent_node(hir_id)),
+ Node::Expr(Expr { kind: ExprKind::Closure(Closure { fn_decl_span, .. }), .. }) => {
+ *fn_decl_span
+ }
+ _ => self.span_with_body(hir_id),
+ };
+ Some(span)
+ }
+
+ /// Like `hir.span()`, but includes the body of items
+ /// (instead of just the item header)
+ pub fn span_with_body(self, hir_id: HirId) -> Span {
+ match self.get(hir_id) {
+ Node::Param(param) => param.span,
+ Node::Item(item) => item.span,
+ Node::ForeignItem(foreign_item) => foreign_item.span,
+ Node::TraitItem(trait_item) => trait_item.span,
+ Node::ImplItem(impl_item) => impl_item.span,
+ Node::Variant(variant) => variant.span,
+ Node::Field(field) => field.span,
+ Node::AnonConst(constant) => self.body(constant.body).value.span,
+ Node::Expr(expr) => expr.span,
+ Node::Stmt(stmt) => stmt.span,
+ Node::PathSegment(seg) => {
+ let ident_span = seg.ident.span;
+ ident_span
+ .with_hi(seg.args.map_or_else(|| ident_span.hi(), |args| args.span_ext.hi()))
+ }
+ Node::Ty(ty) => ty.span,
+ Node::TypeBinding(tb) => tb.span,
+ Node::TraitRef(tr) => tr.path.span,
+ Node::Pat(pat) => pat.span,
+ Node::Arm(arm) => arm.span,
+ Node::Block(block) => block.span,
+ Node::Ctor(..) => self.span_with_body(self.get_parent_node(hir_id)),
+ Node::Lifetime(lifetime) => lifetime.span,
+ Node::GenericParam(param) => param.span,
+ Node::Infer(i) => i.span,
+ Node::Local(local) => local.span,
+ Node::Crate(item) => item.spans.inner_span,
+ }
+ }
+
+ pub fn span_if_local(self, id: DefId) -> Option<Span> {
+ if id.is_local() { Some(self.tcx.def_span(id)) } else { None }
+ }
+
+ pub fn res_span(self, res: Res) -> Option<Span> {
+ match res {
+ Res::Err => None,
+ Res::Local(id) => Some(self.span(id)),
+ res => self.span_if_local(res.opt_def_id()?),
+ }
+ }
+
+ /// Get a representation of this `id` for debugging purposes.
+ /// NOTE: Do NOT use this in diagnostics!
+ pub fn node_to_string(self, id: HirId) -> String {
+ hir_id_to_string(self, id)
+ }
+
+ /// Returns the HirId of `N` in `struct Foo<const N: usize = { ... }>` when
+ /// called with the HirId for the `{ ... }` anon const
+ pub fn opt_const_param_default_param_hir_id(self, anon_const: HirId) -> Option<HirId> {
+ match self.get(self.get_parent_node(anon_const)) {
+ Node::GenericParam(GenericParam {
+ hir_id: param_id,
+ kind: GenericParamKind::Const { .. },
+ ..
+ }) => Some(*param_id),
+ _ => None,
+ }
+ }
+}
+
+impl<'hir> intravisit::Map<'hir> for Map<'hir> {
+ fn find(&self, hir_id: HirId) -> Option<Node<'hir>> {
+ (*self).find(hir_id)
+ }
+
+ fn body(&self, id: BodyId) -> &'hir Body<'hir> {
+ (*self).body(id)
+ }
+
+ fn item(&self, id: ItemId) -> &'hir Item<'hir> {
+ (*self).item(id)
+ }
+
+ fn trait_item(&self, id: TraitItemId) -> &'hir TraitItem<'hir> {
+ (*self).trait_item(id)
+ }
+
+ fn impl_item(&self, id: ImplItemId) -> &'hir ImplItem<'hir> {
+ (*self).impl_item(id)
+ }
+
+ fn foreign_item(&self, id: ForeignItemId) -> &'hir ForeignItem<'hir> {
+ (*self).foreign_item(id)
+ }
+}
+
+pub(super) fn crate_hash(tcx: TyCtxt<'_>, crate_num: CrateNum) -> Svh {
+ debug_assert_eq!(crate_num, LOCAL_CRATE);
+ let krate = tcx.hir_crate(());
+ let hir_body_hash = krate.hir_hash;
+
+ let upstream_crates = upstream_crates(tcx);
+
+ let resolutions = tcx.resolutions(());
+
+ // We hash the final, remapped names of all local source files so we
+ // don't have to include the path prefix remapping commandline args.
+ // If we included the full mapping in the SVH, we could only have
+ // reproducible builds by compiling from the same directory. So we just
+ // hash the result of the mapping instead of the mapping itself.
+ let mut source_file_names: Vec<_> = tcx
+ .sess
+ .source_map()
+ .files()
+ .iter()
+ .filter(|source_file| source_file.cnum == LOCAL_CRATE)
+ .map(|source_file| source_file.name_hash)
+ .collect();
+
+ source_file_names.sort_unstable();
+
+ let crate_hash: Fingerprint = tcx.with_stable_hashing_context(|mut hcx| {
+ let mut stable_hasher = StableHasher::new();
+ hir_body_hash.hash_stable(&mut hcx, &mut stable_hasher);
+ upstream_crates.hash_stable(&mut hcx, &mut stable_hasher);
+ source_file_names.hash_stable(&mut hcx, &mut stable_hasher);
+ if tcx.sess.opts.unstable_opts.incremental_relative_spans {
+ let definitions = tcx.definitions_untracked();
+ let mut owner_spans: Vec<_> = krate
+ .owners
+ .iter_enumerated()
+ .filter_map(|(def_id, info)| {
+ let _ = info.as_owner()?;
+ let def_path_hash = definitions.def_path_hash(def_id);
+ let span = resolutions.source_span[def_id];
+ debug_assert_eq!(span.parent(), None);
+ Some((def_path_hash, span))
+ })
+ .collect();
+ owner_spans.sort_unstable_by_key(|bn| bn.0);
+ owner_spans.hash_stable(&mut hcx, &mut stable_hasher);
+ }
+ tcx.sess.opts.dep_tracking_hash(true).hash_stable(&mut hcx, &mut stable_hasher);
+ tcx.sess.local_stable_crate_id().hash_stable(&mut hcx, &mut stable_hasher);
+ // Hash visibility information since it does not appear in HIR.
+ resolutions.visibilities.hash_stable(&mut hcx, &mut stable_hasher);
+ resolutions.has_pub_restricted.hash_stable(&mut hcx, &mut stable_hasher);
+ stable_hasher.finish()
+ });
+
+ Svh::new(crate_hash.to_smaller_hash())
+}
+
+fn upstream_crates(tcx: TyCtxt<'_>) -> Vec<(StableCrateId, Svh)> {
+ let mut upstream_crates: Vec<_> = tcx
+ .crates(())
+ .iter()
+ .map(|&cnum| {
+ let stable_crate_id = tcx.stable_crate_id(cnum);
+ let hash = tcx.crate_hash(cnum);
+ (stable_crate_id, hash)
+ })
+ .collect();
+ upstream_crates.sort_unstable_by_key(|&(stable_crate_id, _)| stable_crate_id);
+ upstream_crates
+}
+
+fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
+ let id_str = format!(" (hir_id={})", id);
+
+ let path_str = || {
+ // This functionality is used for debugging, try to use `TyCtxt` to get
+ // the user-friendly path, otherwise fall back to stringifying `DefPath`.
+ crate::ty::tls::with_opt(|tcx| {
+ if let Some(tcx) = tcx {
+ let def_id = map.local_def_id(id);
+ tcx.def_path_str(def_id.to_def_id())
+ } else if let Some(path) = map.def_path_from_hir_id(id) {
+ path.data.into_iter().map(|elem| elem.to_string()).collect::<Vec<_>>().join("::")
+ } else {
+ String::from("<missing path>")
+ }
+ })
+ };
+
+ let span_str = || map.tcx.sess.source_map().span_to_snippet(map.span(id)).unwrap_or_default();
+ let node_str = |prefix| format!("{} {}{}", prefix, span_str(), id_str);
+
+ match map.find(id) {
+ Some(Node::Item(item)) => {
+ let item_str = match item.kind {
+ ItemKind::ExternCrate(..) => "extern crate",
+ ItemKind::Use(..) => "use",
+ ItemKind::Static(..) => "static",
+ ItemKind::Const(..) => "const",
+ ItemKind::Fn(..) => "fn",
+ ItemKind::Macro(..) => "macro",
+ ItemKind::Mod(..) => "mod",
+ ItemKind::ForeignMod { .. } => "foreign mod",
+ ItemKind::GlobalAsm(..) => "global asm",
+ ItemKind::TyAlias(..) => "ty",
+ ItemKind::OpaqueTy(..) => "opaque type",
+ ItemKind::Enum(..) => "enum",
+ ItemKind::Struct(..) => "struct",
+ ItemKind::Union(..) => "union",
+ ItemKind::Trait(..) => "trait",
+ ItemKind::TraitAlias(..) => "trait alias",
+ ItemKind::Impl { .. } => "impl",
+ };
+ format!("{} {}{}", item_str, path_str(), id_str)
+ }
+ Some(Node::ForeignItem(_)) => format!("foreign item {}{}", path_str(), id_str),
+ Some(Node::ImplItem(ii)) => match ii.kind {
+ ImplItemKind::Const(..) => {
+ format!("assoc const {} in {}{}", ii.ident, path_str(), id_str)
+ }
+ ImplItemKind::Fn(..) => format!("method {} in {}{}", ii.ident, path_str(), id_str),
+ ImplItemKind::TyAlias(_) => {
+ format!("assoc type {} in {}{}", ii.ident, path_str(), id_str)
+ }
+ },
+ Some(Node::TraitItem(ti)) => {
+ let kind = match ti.kind {
+ TraitItemKind::Const(..) => "assoc constant",
+ TraitItemKind::Fn(..) => "trait method",
+ TraitItemKind::Type(..) => "assoc type",
+ };
+
+ format!("{} {} in {}{}", kind, ti.ident, path_str(), id_str)
+ }
+ Some(Node::Variant(ref variant)) => {
+ format!("variant {} in {}{}", variant.ident, path_str(), id_str)
+ }
+ Some(Node::Field(ref field)) => {
+ format!("field {} in {}{}", field.ident, path_str(), id_str)
+ }
+ Some(Node::AnonConst(_)) => node_str("const"),
+ Some(Node::Expr(_)) => node_str("expr"),
+ Some(Node::Stmt(_)) => node_str("stmt"),
+ Some(Node::PathSegment(_)) => node_str("path segment"),
+ Some(Node::Ty(_)) => node_str("type"),
+ Some(Node::TypeBinding(_)) => node_str("type binding"),
+ Some(Node::TraitRef(_)) => node_str("trait ref"),
+ Some(Node::Pat(_)) => node_str("pat"),
+ Some(Node::Param(_)) => node_str("param"),
+ Some(Node::Arm(_)) => node_str("arm"),
+ Some(Node::Block(_)) => node_str("block"),
+ Some(Node::Infer(_)) => node_str("infer"),
+ Some(Node::Local(_)) => node_str("local"),
+ Some(Node::Ctor(..)) => format!("ctor {}{}", path_str(), id_str),
+ Some(Node::Lifetime(_)) => node_str("lifetime"),
+ Some(Node::GenericParam(ref param)) => format!("generic_param {:?}{}", param, id_str),
+ Some(Node::Crate(..)) => String::from("root_crate"),
+ None => format!("unknown node{}", id_str),
+ }
+}
+
+pub(super) fn hir_module_items(tcx: TyCtxt<'_>, module_id: LocalDefId) -> ModuleItems {
+ let mut collector = ItemCollector::new(tcx, false);
+
+ let (hir_mod, span, hir_id) = tcx.hir().get_module(module_id);
+ collector.visit_mod(hir_mod, span, hir_id);
+
+ let ItemCollector {
+ submodules,
+ items,
+ trait_items,
+ impl_items,
+ foreign_items,
+ body_owners,
+ ..
+ } = collector;
+ return ModuleItems {
+ submodules: submodules.into_boxed_slice(),
+ items: items.into_boxed_slice(),
+ trait_items: trait_items.into_boxed_slice(),
+ impl_items: impl_items.into_boxed_slice(),
+ foreign_items: foreign_items.into_boxed_slice(),
+ body_owners: body_owners.into_boxed_slice(),
+ };
+}
+
+pub(crate) fn hir_crate_items(tcx: TyCtxt<'_>, _: ()) -> ModuleItems {
+ let mut collector = ItemCollector::new(tcx, true);
+
+ // A "crate collector" and "module collector" start at a
+ // module item (the former starts at the crate root) but only
+ // the former needs to collect it. ItemCollector does not do this for us.
+ collector.submodules.push(CRATE_DEF_ID);
+ tcx.hir().walk_toplevel_module(&mut collector);
+
+ let ItemCollector {
+ submodules,
+ items,
+ trait_items,
+ impl_items,
+ foreign_items,
+ body_owners,
+ ..
+ } = collector;
+
+ return ModuleItems {
+ submodules: submodules.into_boxed_slice(),
+ items: items.into_boxed_slice(),
+ trait_items: trait_items.into_boxed_slice(),
+ impl_items: impl_items.into_boxed_slice(),
+ foreign_items: foreign_items.into_boxed_slice(),
+ body_owners: body_owners.into_boxed_slice(),
+ };
+}
+
+struct ItemCollector<'tcx> {
+ // When true, it collects all items in the create,
+ // otherwise it collects items in some module.
+ crate_collector: bool,
+ tcx: TyCtxt<'tcx>,
+ submodules: Vec<LocalDefId>,
+ items: Vec<ItemId>,
+ trait_items: Vec<TraitItemId>,
+ impl_items: Vec<ImplItemId>,
+ foreign_items: Vec<ForeignItemId>,
+ body_owners: Vec<LocalDefId>,
+}
+
+impl<'tcx> ItemCollector<'tcx> {
+ fn new(tcx: TyCtxt<'tcx>, crate_collector: bool) -> ItemCollector<'tcx> {
+ ItemCollector {
+ crate_collector,
+ tcx,
+ submodules: Vec::default(),
+ items: Vec::default(),
+ trait_items: Vec::default(),
+ impl_items: Vec::default(),
+ foreign_items: Vec::default(),
+ body_owners: Vec::default(),
+ }
+ }
+}
+
+impl<'hir> Visitor<'hir> for ItemCollector<'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.tcx.hir()
+ }
+
+ fn visit_item(&mut self, item: &'hir Item<'hir>) {
+ if associated_body(Node::Item(item)).is_some() {
+ self.body_owners.push(item.def_id);
+ }
+
+ self.items.push(item.item_id());
+
+ // Items that are modules are handled here instead of in visit_mod.
+ if let ItemKind::Mod(module) = &item.kind {
+ self.submodules.push(item.def_id);
+ // A module collector does not recurse inside nested modules.
+ if self.crate_collector {
+ intravisit::walk_mod(self, module, item.hir_id());
+ }
+ } else {
+ intravisit::walk_item(self, item)
+ }
+ }
+
+ fn visit_foreign_item(&mut self, item: &'hir ForeignItem<'hir>) {
+ self.foreign_items.push(item.foreign_item_id());
+ intravisit::walk_foreign_item(self, item)
+ }
+
+ fn visit_anon_const(&mut self, c: &'hir AnonConst) {
+ self.body_owners.push(self.tcx.hir().local_def_id(c.hir_id));
+ intravisit::walk_anon_const(self, c)
+ }
+
+ fn visit_expr(&mut self, ex: &'hir Expr<'hir>) {
+ if matches!(ex.kind, ExprKind::Closure { .. }) {
+ self.body_owners.push(self.tcx.hir().local_def_id(ex.hir_id));
+ }
+ intravisit::walk_expr(self, ex)
+ }
+
+ fn visit_trait_item(&mut self, item: &'hir TraitItem<'hir>) {
+ if associated_body(Node::TraitItem(item)).is_some() {
+ self.body_owners.push(item.def_id);
+ }
+
+ self.trait_items.push(item.trait_item_id());
+ intravisit::walk_trait_item(self, item)
+ }
+
+ fn visit_impl_item(&mut self, item: &'hir ImplItem<'hir>) {
+ if associated_body(Node::ImplItem(item)).is_some() {
+ self.body_owners.push(item.def_id);
+ }
+
+ self.impl_items.push(item.impl_item_id());
+ intravisit::walk_impl_item(self, item)
+ }
+}
diff --git a/compiler/rustc_middle/src/hir/mod.rs b/compiler/rustc_middle/src/hir/mod.rs
new file mode 100644
index 000000000..211a61471
--- /dev/null
+++ b/compiler/rustc_middle/src/hir/mod.rs
@@ -0,0 +1,182 @@
+//! HIR datatypes. See the [rustc dev guide] for more info.
+//!
+//! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/hir.html
+
+pub mod map;
+pub mod nested_filter;
+pub mod place;
+
+use crate::ty::query::Providers;
+use crate::ty::{DefIdTree, ImplSubject, TyCtxt};
+use rustc_data_structures::fingerprint::Fingerprint;
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
+use rustc_data_structures::sync::{par_for_each_in, Send, Sync};
+use rustc_hir::def_id::{DefId, LocalDefId};
+use rustc_hir::*;
+use rustc_query_system::ich::StableHashingContext;
+use rustc_span::{ExpnId, DUMMY_SP};
+
+/// Top-level HIR node for current owner. This only contains the node for which
+/// `HirId::local_id == 0`, and excludes bodies.
+///
+/// This struct exists to encapsulate all access to the hir_owner query in this module, and to
+/// implement HashStable without hashing bodies.
+#[derive(Copy, Clone, Debug)]
+pub struct Owner<'tcx> {
+ node: OwnerNode<'tcx>,
+ hash_without_bodies: Fingerprint,
+}
+
+impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Owner<'tcx> {
+ #[inline]
+ fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
+ let Owner { node: _, hash_without_bodies } = self;
+ hash_without_bodies.hash_stable(hcx, hasher)
+ }
+}
+
+/// Gather the LocalDefId for each item-like within a module, including items contained within
+/// bodies. The Ids are in visitor order. This is used to partition a pass between modules.
+#[derive(Debug, HashStable, Encodable, Decodable)]
+pub struct ModuleItems {
+ submodules: Box<[LocalDefId]>,
+ items: Box<[ItemId]>,
+ trait_items: Box<[TraitItemId]>,
+ impl_items: Box<[ImplItemId]>,
+ foreign_items: Box<[ForeignItemId]>,
+ body_owners: Box<[LocalDefId]>,
+}
+
+impl ModuleItems {
+ pub fn items(&self) -> impl Iterator<Item = ItemId> + '_ {
+ self.items.iter().copied()
+ }
+
+ pub fn trait_items(&self) -> impl Iterator<Item = TraitItemId> + '_ {
+ self.trait_items.iter().copied()
+ }
+
+ pub fn impl_items(&self) -> impl Iterator<Item = ImplItemId> + '_ {
+ self.impl_items.iter().copied()
+ }
+
+ pub fn foreign_items(&self) -> impl Iterator<Item = ForeignItemId> + '_ {
+ self.foreign_items.iter().copied()
+ }
+
+ pub fn definitions(&self) -> impl Iterator<Item = LocalDefId> + '_ {
+ self.items
+ .iter()
+ .map(|id| id.def_id)
+ .chain(self.trait_items.iter().map(|id| id.def_id))
+ .chain(self.impl_items.iter().map(|id| id.def_id))
+ .chain(self.foreign_items.iter().map(|id| id.def_id))
+ }
+
+ pub fn par_items(&self, f: impl Fn(ItemId) + Send + Sync) {
+ par_for_each_in(&self.items[..], |&id| f(id))
+ }
+
+ pub fn par_trait_items(&self, f: impl Fn(TraitItemId) + Send + Sync) {
+ par_for_each_in(&self.trait_items[..], |&id| f(id))
+ }
+
+ pub fn par_impl_items(&self, f: impl Fn(ImplItemId) + Send + Sync) {
+ par_for_each_in(&self.impl_items[..], |&id| f(id))
+ }
+
+ pub fn par_foreign_items(&self, f: impl Fn(ForeignItemId) + Send + Sync) {
+ par_for_each_in(&self.foreign_items[..], |&id| f(id))
+ }
+}
+
+impl<'tcx> TyCtxt<'tcx> {
+ #[inline(always)]
+ pub fn hir(self) -> map::Map<'tcx> {
+ map::Map { tcx: self }
+ }
+
+ pub fn parent_module(self, id: HirId) -> LocalDefId {
+ self.parent_module_from_def_id(id.owner)
+ }
+
+ pub fn impl_subject(self, def_id: DefId) -> ImplSubject<'tcx> {
+ self.impl_trait_ref(def_id)
+ .map(ImplSubject::Trait)
+ .unwrap_or_else(|| ImplSubject::Inherent(self.type_of(def_id)))
+ }
+}
+
+pub fn provide(providers: &mut Providers) {
+ providers.parent_module_from_def_id = |tcx, id| {
+ let hir = tcx.hir();
+ hir.get_module_parent_node(hir.local_def_id_to_hir_id(id))
+ };
+ providers.hir_crate_items = map::hir_crate_items;
+ providers.crate_hash = map::crate_hash;
+ providers.hir_module_items = map::hir_module_items;
+ providers.hir_owner = |tcx, id| {
+ let owner = tcx.hir_crate(()).owners.get(id)?.as_owner()?;
+ let node = owner.node();
+ Some(Owner { node, hash_without_bodies: owner.nodes.hash_without_bodies })
+ };
+ providers.local_def_id_to_hir_id = |tcx, id| {
+ let owner = tcx.hir_crate(()).owners[id].map(|_| ());
+ match owner {
+ MaybeOwner::Owner(_) => HirId::make_owner(id),
+ MaybeOwner::Phantom => bug!("No HirId for {:?}", id),
+ MaybeOwner::NonOwner(hir_id) => hir_id,
+ }
+ };
+ providers.hir_owner_nodes = |tcx, id| tcx.hir_crate(()).owners[id].map(|i| &i.nodes);
+ providers.hir_owner_parent = |tcx, id| {
+ // Accessing the local_parent is ok since its value is hashed as part of `id`'s DefPathHash.
+ tcx.opt_local_parent(id).map_or(CRATE_HIR_ID, |parent| {
+ let mut parent_hir_id = tcx.hir().local_def_id_to_hir_id(parent);
+ if let Some(local_id) =
+ tcx.hir_crate(()).owners[parent_hir_id.owner].unwrap().parenting.get(&id)
+ {
+ parent_hir_id.local_id = *local_id;
+ }
+ parent_hir_id
+ })
+ };
+ providers.hir_attrs =
+ |tcx, id| tcx.hir_crate(()).owners[id].as_owner().map_or(AttributeMap::EMPTY, |o| &o.attrs);
+ providers.source_span =
+ |tcx, def_id| tcx.resolutions(()).source_span.get(def_id).copied().unwrap_or(DUMMY_SP);
+ providers.def_span = |tcx, def_id| {
+ let def_id = def_id.expect_local();
+ let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
+ tcx.hir().opt_span(hir_id).unwrap_or(DUMMY_SP)
+ };
+ providers.def_ident_span = |tcx, def_id| {
+ let def_id = def_id.expect_local();
+ let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
+ tcx.hir().opt_ident_span(hir_id)
+ };
+ providers.fn_arg_names = |tcx, id| {
+ let hir = tcx.hir();
+ let def_id = id.expect_local();
+ let hir_id = hir.local_def_id_to_hir_id(def_id);
+ if let Some(body_id) = hir.maybe_body_owned_by(def_id) {
+ tcx.arena.alloc_from_iter(hir.body_param_names(body_id))
+ } else if let Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Fn(_, TraitFn::Required(idents)),
+ ..
+ }) = hir.get(hir_id)
+ {
+ tcx.arena.alloc_slice(idents)
+ } else {
+ span_bug!(hir.span(hir_id), "fn_arg_names: unexpected item {:?}", id);
+ }
+ };
+ providers.opt_def_kind = |tcx, def_id| tcx.hir().opt_def_kind(def_id.expect_local());
+ providers.all_local_trait_impls = |tcx, ()| &tcx.resolutions(()).trait_impls;
+ providers.expn_that_defined = |tcx, id| {
+ let id = id.expect_local();
+ tcx.resolutions(()).expn_that_defined.get(&id).copied().unwrap_or(ExpnId::root())
+ };
+ providers.in_scope_traits_map =
+ |tcx, id| tcx.hir_crate(()).owners[id].as_owner().map(|owner_info| &owner_info.trait_map);
+}
diff --git a/compiler/rustc_middle/src/hir/nested_filter.rs b/compiler/rustc_middle/src/hir/nested_filter.rs
new file mode 100644
index 000000000..6896837aa
--- /dev/null
+++ b/compiler/rustc_middle/src/hir/nested_filter.rs
@@ -0,0 +1,31 @@
+use rustc_hir::intravisit::nested_filter::NestedFilter;
+
+/// Do not visit nested item-like things, but visit nested things
+/// that are inside of an item-like.
+///
+/// Notably, possible occurrences of bodies in non-item-like things
+/// include: closures/generators, inline `const {}` blocks, and
+/// constant arguments of types, e.g. in `let _: [(); /* HERE */];`.
+///
+/// **This is the most common choice.** A very common pattern is
+/// to use `visit_all_item_likes_in_crate()` as an outer loop,
+/// and to have the visitor that visits the contents of each item
+/// using this setting.
+pub struct OnlyBodies(());
+impl<'hir> NestedFilter<'hir> for OnlyBodies {
+ type Map = crate::hir::map::Map<'hir>;
+ const INTER: bool = false;
+ const INTRA: bool = true;
+}
+
+/// Visits all nested things, including item-likes.
+///
+/// **This is an unusual choice.** It is used when you want to
+/// process everything within their lexical context. Typically you
+/// kick off the visit by doing `walk_krate()`.
+pub struct All(());
+impl<'hir> NestedFilter<'hir> for All {
+ type Map = crate::hir::map::Map<'hir>;
+ const INTER: bool = true;
+ const INTRA: bool = true;
+}
diff --git a/compiler/rustc_middle/src/hir/place.rs b/compiler/rustc_middle/src/hir/place.rs
new file mode 100644
index 000000000..83d3b0100
--- /dev/null
+++ b/compiler/rustc_middle/src/hir/place.rs
@@ -0,0 +1,117 @@
+use crate::ty;
+use crate::ty::Ty;
+
+use rustc_hir::HirId;
+use rustc_target::abi::VariantIdx;
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
+#[derive(TypeFoldable, TypeVisitable)]
+pub enum PlaceBase {
+ /// A temporary variable.
+ Rvalue,
+ /// A named `static` item.
+ StaticItem,
+ /// A named local variable.
+ Local(HirId),
+ /// An upvar referenced by closure env.
+ Upvar(ty::UpvarId),
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
+#[derive(TypeFoldable, TypeVisitable)]
+pub enum ProjectionKind {
+ /// A dereference of a pointer, reference or `Box<T>` of the given type.
+ Deref,
+
+ /// `B.F` where `B` is the base expression and `F` is
+ /// the field. The field is identified by which variant
+ /// it appears in along with a field index. The variant
+ /// is used for enums.
+ Field(u32, VariantIdx),
+
+ /// Some index like `B[x]`, where `B` is the base
+ /// expression. We don't preserve the index `x` because
+ /// we won't need it.
+ Index,
+
+ /// A subslice covering a range of values like `B[x..y]`.
+ Subslice,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
+#[derive(TypeFoldable, TypeVisitable)]
+pub struct Projection<'tcx> {
+ /// Type after the projection is applied.
+ pub ty: Ty<'tcx>,
+
+ /// Defines the kind of access made by the projection.
+ pub kind: ProjectionKind,
+}
+
+/// A `Place` represents how a value is located in memory.
+///
+/// This is an HIR version of [`rustc_middle::mir::Place`].
+#[derive(Clone, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
+#[derive(TypeFoldable, TypeVisitable)]
+pub struct Place<'tcx> {
+ /// The type of the `PlaceBase`
+ pub base_ty: Ty<'tcx>,
+ /// The "outermost" place that holds this value.
+ pub base: PlaceBase,
+ /// How this place is derived from the base place.
+ pub projections: Vec<Projection<'tcx>>,
+}
+
+/// A `PlaceWithHirId` represents how a value is located in memory.
+///
+/// This is an HIR version of [`rustc_middle::mir::Place`].
+#[derive(Clone, Debug, PartialEq, Eq, Hash, TyEncodable, TyDecodable, HashStable)]
+#[derive(TypeFoldable, TypeVisitable)]
+pub struct PlaceWithHirId<'tcx> {
+ /// `HirId` of the expression or pattern producing this value.
+ pub hir_id: HirId,
+
+ /// Information about the `Place`.
+ pub place: Place<'tcx>,
+}
+
+impl<'tcx> PlaceWithHirId<'tcx> {
+ pub fn new(
+ hir_id: HirId,
+ base_ty: Ty<'tcx>,
+ base: PlaceBase,
+ projections: Vec<Projection<'tcx>>,
+ ) -> PlaceWithHirId<'tcx> {
+ PlaceWithHirId { hir_id, place: Place { base_ty, base, projections } }
+ }
+}
+
+impl<'tcx> Place<'tcx> {
+ /// Returns an iterator of the types that have to be dereferenced to access
+ /// the `Place`.
+ ///
+ /// The types are in the reverse order that they are applied. So if
+ /// `x: &*const u32` and the `Place` is `**x`, then the types returned are
+ ///`*const u32` then `&*const u32`.
+ pub fn deref_tys(&self) -> impl Iterator<Item = Ty<'tcx>> + '_ {
+ self.projections.iter().enumerate().rev().filter_map(move |(index, proj)| {
+ if ProjectionKind::Deref == proj.kind {
+ Some(self.ty_before_projection(index))
+ } else {
+ None
+ }
+ })
+ }
+
+ /// Returns the type of this `Place` after all projections have been applied.
+ pub fn ty(&self) -> Ty<'tcx> {
+ self.projections.last().map_or(self.base_ty, |proj| proj.ty)
+ }
+
+ /// Returns the type of this `Place` immediately before `projection_index`th projection
+ /// is applied.
+ pub fn ty_before_projection(&self, projection_index: usize) -> Ty<'tcx> {
+ assert!(projection_index < self.projections.len());
+ if projection_index == 0 { self.base_ty } else { self.projections[projection_index - 1].ty }
+ }
+}