diff options
Diffstat (limited to 'compiler/rustc_middle/src/hir/map/mod.rs')
| -rw-r--r-- | compiler/rustc_middle/src/hir/map/mod.rs | 1405 |
1 files changed, 1405 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) + } +} |