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mod.rs
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mod.rs
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//! HIR datatypes. See the [rustc dev guide] for more info.
//!
//! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/hir.html
pub mod exports;
pub mod map;
pub mod place;
use crate::ich::StableHashingContext;
use crate::ty::query::Providers;
use crate::ty::TyCtxt;
use rustc_ast::Attribute;
use rustc_data_structures::fingerprint::Fingerprint;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_hir::def_id::LocalDefId;
use rustc_hir::*;
use rustc_index::vec::{Idx, IndexVec};
use rustc_span::DUMMY_SP;
use std::collections::BTreeMap;
/// Result of HIR indexing.
#[derive(Debug)]
pub struct IndexedHir<'hir> {
/// Contents of the HIR owned by each definition. None for definitions that are not HIR owners.
// The `mut` comes from construction time, and is harmless since we only ever hand out
// immutable refs to IndexedHir.
map: IndexVec<LocalDefId, Option<&'hir mut OwnerNodes<'hir>>>,
/// Map from each owner to its parent's HirId inside another owner.
// This map is separate from `map` to eventually allow for per-owner indexing.
parenting: FxHashMap<LocalDefId, HirId>,
}
/// 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>,
}
impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Owner<'tcx> {
fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
let Owner { node } = self;
hcx.while_hashing_hir_bodies(false, |hcx| node.hash_stable(hcx, hasher));
}
}
/// HIR node coupled with its parent's id in the same HIR owner.
///
/// The parent is trash when the node is a HIR owner.
#[derive(Clone, Debug)]
pub struct ParentedNode<'tcx> {
parent: ItemLocalId,
node: Node<'tcx>,
}
#[derive(Debug)]
pub struct OwnerNodes<'tcx> {
/// Pre-computed hash of the full HIR.
hash: Fingerprint,
/// Full HIR for the current owner.
// The zeroth node's parent is trash, but is never accessed.
nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>,
/// Content of local bodies.
bodies: FxHashMap<ItemLocalId, &'tcx Body<'tcx>>,
}
impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for OwnerNodes<'tcx> {
fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
// We ignore the `nodes` and `bodies` fields since these refer to information included in
// `hash` which is hashed in the collector and used for the crate hash.
let OwnerNodes { hash, nodes: _, bodies: _ } = *self;
hash.hash_stable(hcx, hasher);
}
}
/// Attributes owner by a HIR owner. It is build as a slice inside the attributes map, restricted
/// to the nodes whose `HirId::owner` is `prefix`.
#[derive(Copy, Clone)]
pub struct AttributeMap<'tcx> {
map: &'tcx BTreeMap<HirId, &'tcx [Attribute]>,
prefix: LocalDefId,
}
impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for AttributeMap<'tcx> {
fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
let range = self.range();
range.clone().count().hash_stable(hcx, hasher);
for (key, value) in range {
key.hash_stable(hcx, hasher);
value.hash_stable(hcx, hasher);
}
}
}
impl<'tcx> std::fmt::Debug for AttributeMap<'tcx> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("AttributeMap")
.field("prefix", &self.prefix)
.field("range", &&self.range().collect::<Vec<_>>()[..])
.finish()
}
}
impl<'tcx> AttributeMap<'tcx> {
fn get(&self, id: ItemLocalId) -> &'tcx [Attribute] {
self.map.get(&HirId { owner: self.prefix, local_id: id }).copied().unwrap_or(&[])
}
fn range(&self) -> std::collections::btree_map::Range<'_, rustc_hir::HirId, &[Attribute]> {
let local_zero = ItemLocalId::from_u32(0);
let range = HirId { owner: self.prefix, local_id: local_zero }..HirId {
owner: LocalDefId { local_def_index: self.prefix.local_def_index + 1 },
local_id: local_zero,
};
self.map.range(range)
}
}
/// 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)]
pub struct ModuleItems {
submodules: Box<[LocalDefId]>,
items: Box<[ItemId]>,
trait_items: Box<[TraitItemId]>,
impl_items: Box<[ImplItemId]>,
foreign_items: Box<[ForeignItemId]>,
}
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 provide(providers: &mut Providers) {
providers.parent_module_from_def_id = |tcx, id| {
let hir = tcx.hir();
hir.local_def_id(hir.get_module_parent_node(hir.local_def_id_to_hir_id(id)))
};
providers.hir_crate = |tcx, ()| tcx.untracked_crate;
providers.index_hir = map::index_hir;
providers.crate_hash = map::crate_hash;
providers.hir_module_items = map::hir_module_items;
providers.hir_owner = |tcx, id| {
let owner = tcx.index_hir(()).map[id].as_ref()?;
let node = owner.nodes[ItemLocalId::new(0)].as_ref().unwrap().node;
let node = node.as_owner().unwrap(); // Indexing must ensure it is an OwnerNode.
Some(Owner { node })
};
providers.hir_owner_nodes = |tcx, id| tcx.index_hir(()).map[id].as_deref();
providers.hir_owner_parent = |tcx, id| {
let index = tcx.index_hir(());
index.parenting.get(&id).copied().unwrap_or(CRATE_HIR_ID)
};
providers.hir_attrs = |tcx, id| AttributeMap { map: &tcx.untracked_crate.attrs, prefix: id };
providers.source_span = |tcx, def_id| tcx.resolutions(()).definitions.def_span(def_id);
providers.def_span = |tcx, def_id| tcx.hir().span_if_local(def_id).unwrap_or(DUMMY_SP);
providers.fn_arg_names = |tcx, id| {
let hir = tcx.hir();
let hir_id = hir.local_def_id_to_hir_id(id.expect_local());
if let Some(body_id) = hir.maybe_body_owned_by(hir_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(()).definitions.expansion_that_defined(id)
};
}