1 use crate::arena::Arena;
2 use crate::hir::map::{Entry, HirOwnerData, Map};
3 use crate::hir::{Owner, OwnerNodes, ParentedNode};
4 use crate::ich::StableHashingContext;
5 use crate::middle::cstore::CrateStore;
6 use rustc_data_structures::fingerprint::Fingerprint;
7 use rustc_data_structures::fx::FxHashMap;
8 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
9 use rustc_data_structures::svh::Svh;
11 use rustc_hir::def_id::CRATE_DEF_INDEX;
12 use rustc_hir::def_id::{LocalDefId, LOCAL_CRATE};
13 use rustc_hir::definitions::{self, DefPathHash};
14 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
16 use rustc_index::vec::{Idx, IndexVec};
17 use rustc_session::{CrateDisambiguator, Session};
18 use rustc_span::source_map::SourceMap;
19 use rustc_span::{Span, Symbol, DUMMY_SP};
21 use std::iter::repeat;
23 /// A visitor that walks over the HIR and collects `Node`s into a HIR map.
24 pub(super) struct NodeCollector<'a, 'hir> {
25 arena: &'hir Arena<'hir>,
28 krate: &'hir Crate<'hir>,
31 source_map: &'a SourceMap,
33 map: IndexVec<LocalDefId, HirOwnerData<'hir>>,
35 /// The parent of this node
36 parent_node: hir::HirId,
38 current_dep_node_owner: LocalDefId,
40 definitions: &'a definitions::Definitions,
42 hcx: StableHashingContext<'a>,
44 // We are collecting HIR hashes here so we can compute the
45 // crate hash from them later on.
46 hir_body_nodes: Vec<(DefPathHash, Fingerprint)>,
49 fn insert_vec_map<K: Idx, V: Clone>(map: &mut IndexVec<K, Option<V>>, k: K, v: V) {
53 map.extend(repeat(None).take(i - len + 1));
59 hcx: &mut StableHashingContext<'_>,
60 input: impl for<'a> HashStable<StableHashingContext<'a>>,
62 let mut stable_hasher = StableHasher::new();
63 input.hash_stable(hcx, &mut stable_hasher);
64 stable_hasher.finish()
68 hcx: &mut StableHashingContext<'_>,
69 def_path_hash: DefPathHash,
70 item_like: impl for<'a> HashStable<StableHashingContext<'a>>,
71 hir_body_nodes: &mut Vec<(DefPathHash, Fingerprint)>,
73 let hash = hash(hcx, HirItemLike { item_like: &item_like });
74 hir_body_nodes.push((def_path_hash, hash));
78 fn upstream_crates(cstore: &dyn CrateStore) -> Vec<(Symbol, Fingerprint, Svh)> {
79 let mut upstream_crates: Vec<_> = cstore
83 let name = cstore.crate_name_untracked(cnum);
84 let disambiguator = cstore.crate_disambiguator_untracked(cnum).to_fingerprint();
85 let hash = cstore.crate_hash_untracked(cnum);
86 (name, disambiguator, hash)
89 upstream_crates.sort_unstable_by_key(|&(name, dis, _)| (name.as_str(), dis));
93 impl<'a, 'hir> NodeCollector<'a, 'hir> {
96 arena: &'hir Arena<'hir>,
97 krate: &'hir Crate<'hir>,
98 definitions: &'a definitions::Definitions,
99 mut hcx: StableHashingContext<'a>,
100 ) -> NodeCollector<'a, 'hir> {
101 let root_mod_def_path_hash =
102 definitions.def_path_hash(LocalDefId { local_def_index: CRATE_DEF_INDEX });
104 let mut hir_body_nodes = Vec::new();
109 // These fields are handled separately:
111 non_exported_macro_attrs: _,
124 hash_body(&mut hcx, root_mod_def_path_hash, item, &mut hir_body_nodes)
127 let mut collector = NodeCollector {
130 source_map: sess.source_map(),
131 parent_node: hir::CRATE_HIR_ID,
132 current_dep_node_owner: LocalDefId { local_def_index: CRATE_DEF_INDEX },
136 map: (0..definitions.def_index_count())
137 .map(|_| HirOwnerData { signature: None, with_bodies: None })
140 collector.insert_entry(
142 Entry { parent: hir::CRATE_HIR_ID, node: Node::Crate(&krate.item) },
149 pub(super) fn finalize_and_compute_crate_hash(
151 crate_disambiguator: CrateDisambiguator,
152 cstore: &dyn CrateStore,
153 commandline_args_hash: u64,
154 ) -> (IndexVec<LocalDefId, HirOwnerData<'hir>>, Svh) {
155 // Insert bodies into the map
156 for (id, body) in self.krate.bodies.iter() {
157 let bodies = &mut self.map[id.hir_id.owner].with_bodies.as_mut().unwrap().bodies;
158 assert!(bodies.insert(id.hir_id.local_id, body).is_none());
161 self.hir_body_nodes.sort_unstable_by_key(|bn| bn.0);
163 let node_hashes = self.hir_body_nodes.iter().fold(
165 |combined_fingerprint, &(def_path_hash, fingerprint)| {
166 combined_fingerprint.combine(def_path_hash.0.combine(fingerprint))
170 let upstream_crates = upstream_crates(cstore);
172 // We hash the final, remapped names of all local source files so we
173 // don't have to include the path prefix remapping commandline args.
174 // If we included the full mapping in the SVH, we could only have
175 // reproducible builds by compiling from the same directory. So we just
176 // hash the result of the mapping instead of the mapping itself.
177 let mut source_file_names: Vec<_> = self
181 .filter(|source_file| source_file.cnum == LOCAL_CRATE)
182 .map(|source_file| source_file.name_hash)
185 source_file_names.sort_unstable();
187 let crate_hash_input = (
188 ((node_hashes, upstream_crates), source_file_names),
189 (commandline_args_hash, crate_disambiguator.to_fingerprint()),
192 let mut stable_hasher = StableHasher::new();
193 crate_hash_input.hash_stable(&mut self.hcx, &mut stable_hasher);
194 let crate_hash: Fingerprint = stable_hasher.finish();
196 let svh = Svh::new(crate_hash.to_smaller_hash());
200 fn insert_entry(&mut self, id: HirId, entry: Entry<'hir>, hash: Fingerprint) {
201 let i = id.local_id.as_u32() as usize;
203 let arena = self.arena;
205 let data = &mut self.map[id.owner];
207 if data.with_bodies.is_none() {
208 data.with_bodies = Some(arena.alloc(OwnerNodes {
210 nodes: IndexVec::new(),
211 bodies: FxHashMap::default(),
215 let nodes = data.with_bodies.as_mut().unwrap();
218 // Overwrite the dummy hash with the real HIR owner hash.
221 // FIXME: feature(impl_trait_in_bindings) broken and trigger this assert
222 //assert!(data.signature.is_none());
225 Some(self.arena.alloc(Owner { parent: entry.parent, node: entry.node }));
227 assert_eq!(entry.parent.owner, id.owner);
231 ParentedNode { parent: entry.parent.local_id, node: entry.node },
236 fn insert(&mut self, span: Span, hir_id: HirId, node: Node<'hir>) {
237 self.insert_with_hash(span, hir_id, node, Fingerprint::ZERO)
240 fn insert_with_hash(&mut self, span: Span, hir_id: HirId, node: Node<'hir>, hash: Fingerprint) {
241 let entry = Entry { parent: self.parent_node, node };
243 // Make sure that the DepNode of some node coincides with the HirId
244 // owner of that node.
245 if cfg!(debug_assertions) {
246 if hir_id.owner != self.current_dep_node_owner {
247 let node_str = match self.definitions.opt_hir_id_to_local_def_id(hir_id) {
248 Some(def_id) => self.definitions.def_path(def_id).to_string_no_crate_verbose(),
249 None => format!("{:?}", node),
254 "inconsistent DepNode at `{:?}` for `{}`: \
255 current_dep_node_owner={} ({:?}), hir_id.owner={} ({:?})",
256 self.source_map.span_to_string(span),
259 .def_path(self.current_dep_node_owner)
260 .to_string_no_crate_verbose(),
261 self.current_dep_node_owner,
262 self.definitions.def_path(hir_id.owner).to_string_no_crate_verbose(),
268 self.insert_entry(hir_id, entry, hash);
271 fn with_parent<F: FnOnce(&mut Self)>(&mut self, parent_node_id: HirId, f: F) {
272 let parent_node = self.parent_node;
273 self.parent_node = parent_node_id;
275 self.parent_node = parent_node;
278 fn with_dep_node_owner<
279 T: for<'b> HashStable<StableHashingContext<'b>>,
280 F: FnOnce(&mut Self, Fingerprint),
283 dep_node_owner: LocalDefId,
287 let prev_owner = self.current_dep_node_owner;
289 let def_path_hash = self.definitions.def_path_hash(dep_node_owner);
291 let hash = hash_body(&mut self.hcx, def_path_hash, item_like, &mut self.hir_body_nodes);
293 self.current_dep_node_owner = dep_node_owner;
295 self.current_dep_node_owner = prev_owner;
299 impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
300 type Map = Map<'hir>;
302 /// Because we want to track parent items and so forth, enable
303 /// deep walking so that we walk nested items in the context of
304 /// their outer items.
306 fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
307 panic!("`visit_nested_xxx` must be manually implemented in this visitor");
310 fn visit_nested_item(&mut self, item: ItemId) {
311 debug!("visit_nested_item: {:?}", item);
312 self.visit_item(self.krate.item(item.id));
315 fn visit_nested_trait_item(&mut self, item_id: TraitItemId) {
316 self.visit_trait_item(self.krate.trait_item(item_id));
319 fn visit_nested_impl_item(&mut self, item_id: ImplItemId) {
320 self.visit_impl_item(self.krate.impl_item(item_id));
323 fn visit_nested_foreign_item(&mut self, foreign_id: ForeignItemId) {
324 self.visit_foreign_item(self.krate.foreign_item(foreign_id));
327 fn visit_nested_body(&mut self, id: BodyId) {
328 self.visit_body(self.krate.body(id));
331 fn visit_param(&mut self, param: &'hir Param<'hir>) {
332 let node = Node::Param(param);
333 self.insert(param.pat.span, param.hir_id, node);
334 self.with_parent(param.hir_id, |this| {
335 intravisit::walk_param(this, param);
339 fn visit_item(&mut self, i: &'hir Item<'hir>) {
340 debug!("visit_item: {:?}", i);
343 self.definitions.opt_hir_id_to_local_def_id(i.hir_id).unwrap()
345 self.with_dep_node_owner(i.hir_id.owner, i, |this, hash| {
346 this.insert_with_hash(i.span, i.hir_id, Node::Item(i), hash);
347 this.with_parent(i.hir_id, |this| {
348 if let ItemKind::Struct(ref struct_def, _) = i.kind {
349 // If this is a tuple or unit-like struct, register the constructor.
350 if let Some(ctor_hir_id) = struct_def.ctor_hir_id() {
351 this.insert(i.span, ctor_hir_id, Node::Ctor(struct_def));
354 intravisit::walk_item(this, i);
359 fn visit_foreign_item(&mut self, fi: &'hir ForeignItem<'hir>) {
362 self.definitions.opt_hir_id_to_local_def_id(fi.hir_id).unwrap()
364 self.with_dep_node_owner(fi.hir_id.owner, fi, |this, hash| {
365 this.insert_with_hash(fi.span, fi.hir_id, Node::ForeignItem(fi), hash);
367 this.with_parent(fi.hir_id, |this| {
368 intravisit::walk_foreign_item(this, fi);
373 fn visit_generic_param(&mut self, param: &'hir GenericParam<'hir>) {
374 if let hir::GenericParamKind::Type {
375 synthetic: Some(hir::SyntheticTyParamKind::ImplTrait),
381 self.definitions.opt_hir_id_to_local_def_id(param.hir_id).unwrap()
383 self.with_dep_node_owner(param.hir_id.owner, param, |this, hash| {
384 this.insert_with_hash(param.span, param.hir_id, Node::GenericParam(param), hash);
386 this.with_parent(param.hir_id, |this| {
387 intravisit::walk_generic_param(this, param);
391 self.insert(param.span, param.hir_id, Node::GenericParam(param));
392 intravisit::walk_generic_param(self, param);
396 fn visit_trait_item(&mut self, ti: &'hir TraitItem<'hir>) {
399 self.definitions.opt_hir_id_to_local_def_id(ti.hir_id).unwrap()
401 self.with_dep_node_owner(ti.hir_id.owner, ti, |this, hash| {
402 this.insert_with_hash(ti.span, ti.hir_id, Node::TraitItem(ti), hash);
404 this.with_parent(ti.hir_id, |this| {
405 intravisit::walk_trait_item(this, ti);
410 fn visit_impl_item(&mut self, ii: &'hir ImplItem<'hir>) {
413 self.definitions.opt_hir_id_to_local_def_id(ii.hir_id).unwrap()
415 self.with_dep_node_owner(ii.hir_id.owner, ii, |this, hash| {
416 this.insert_with_hash(ii.span, ii.hir_id, Node::ImplItem(ii), hash);
418 this.with_parent(ii.hir_id, |this| {
419 intravisit::walk_impl_item(this, ii);
424 fn visit_pat(&mut self, pat: &'hir Pat<'hir>) {
426 if let PatKind::Binding(..) = pat.kind { Node::Binding(pat) } else { Node::Pat(pat) };
427 self.insert(pat.span, pat.hir_id, node);
429 self.with_parent(pat.hir_id, |this| {
430 intravisit::walk_pat(this, pat);
434 fn visit_arm(&mut self, arm: &'hir Arm<'hir>) {
435 let node = Node::Arm(arm);
437 self.insert(arm.span, arm.hir_id, node);
439 self.with_parent(arm.hir_id, |this| {
440 intravisit::walk_arm(this, arm);
444 fn visit_anon_const(&mut self, constant: &'hir AnonConst) {
445 self.insert(DUMMY_SP, constant.hir_id, Node::AnonConst(constant));
447 self.with_parent(constant.hir_id, |this| {
448 intravisit::walk_anon_const(this, constant);
452 fn visit_expr(&mut self, expr: &'hir Expr<'hir>) {
453 self.insert(expr.span, expr.hir_id, Node::Expr(expr));
455 self.with_parent(expr.hir_id, |this| {
456 intravisit::walk_expr(this, expr);
460 fn visit_stmt(&mut self, stmt: &'hir Stmt<'hir>) {
461 self.insert(stmt.span, stmt.hir_id, Node::Stmt(stmt));
463 self.with_parent(stmt.hir_id, |this| {
464 intravisit::walk_stmt(this, stmt);
468 fn visit_path_segment(&mut self, path_span: Span, path_segment: &'hir PathSegment<'hir>) {
469 if let Some(hir_id) = path_segment.hir_id {
470 self.insert(path_span, hir_id, Node::PathSegment(path_segment));
472 intravisit::walk_path_segment(self, path_span, path_segment);
475 fn visit_ty(&mut self, ty: &'hir Ty<'hir>) {
476 self.insert(ty.span, ty.hir_id, Node::Ty(ty));
478 self.with_parent(ty.hir_id, |this| {
479 intravisit::walk_ty(this, ty);
483 fn visit_trait_ref(&mut self, tr: &'hir TraitRef<'hir>) {
484 self.insert(tr.path.span, tr.hir_ref_id, Node::TraitRef(tr));
486 self.with_parent(tr.hir_ref_id, |this| {
487 intravisit::walk_trait_ref(this, tr);
493 fk: intravisit::FnKind<'hir>,
494 fd: &'hir FnDecl<'hir>,
499 assert_eq!(self.parent_node, id);
500 intravisit::walk_fn(self, fk, fd, b, s, id);
503 fn visit_block(&mut self, block: &'hir Block<'hir>) {
504 self.insert(block.span, block.hir_id, Node::Block(block));
505 self.with_parent(block.hir_id, |this| {
506 intravisit::walk_block(this, block);
510 fn visit_local(&mut self, l: &'hir Local<'hir>) {
511 self.insert(l.span, l.hir_id, Node::Local(l));
512 self.with_parent(l.hir_id, |this| intravisit::walk_local(this, l))
515 fn visit_lifetime(&mut self, lifetime: &'hir Lifetime) {
516 self.insert(lifetime.span, lifetime.hir_id, Node::Lifetime(lifetime));
519 fn visit_vis(&mut self, visibility: &'hir Visibility<'hir>) {
520 match visibility.node {
521 VisibilityKind::Public | VisibilityKind::Crate(_) | VisibilityKind::Inherited => {}
522 VisibilityKind::Restricted { hir_id, .. } => {
523 self.insert(visibility.span, hir_id, Node::Visibility(visibility));
524 self.with_parent(hir_id, |this| {
525 intravisit::walk_vis(this, visibility);
531 fn visit_macro_def(&mut self, macro_def: &'hir MacroDef<'hir>) {
532 self.with_dep_node_owner(macro_def.hir_id.owner, macro_def, |this, hash| {
533 this.insert_with_hash(
536 Node::MacroDef(macro_def),
542 fn visit_variant(&mut self, v: &'hir Variant<'hir>, g: &'hir Generics<'hir>, item_id: HirId) {
543 self.insert(v.span, v.id, Node::Variant(v));
544 self.with_parent(v.id, |this| {
545 // Register the constructor of this variant.
546 if let Some(ctor_hir_id) = v.data.ctor_hir_id() {
547 this.insert(v.span, ctor_hir_id, Node::Ctor(&v.data));
549 intravisit::walk_variant(this, v, g, item_id);
553 fn visit_struct_field(&mut self, field: &'hir StructField<'hir>) {
554 self.insert(field.span, field.hir_id, Node::Field(field));
555 self.with_parent(field.hir_id, |this| {
556 intravisit::walk_struct_field(this, field);
560 fn visit_trait_item_ref(&mut self, ii: &'hir TraitItemRef) {
561 // Do not visit the duplicate information in TraitItemRef. We want to
562 // map the actual nodes, not the duplicate ones in the *Ref.
563 let TraitItemRef { id, ident: _, kind: _, span: _, defaultness: _ } = *ii;
565 self.visit_nested_trait_item(id);
568 fn visit_impl_item_ref(&mut self, ii: &'hir ImplItemRef<'hir>) {
569 // Do not visit the duplicate information in ImplItemRef. We want to
570 // map the actual nodes, not the duplicate ones in the *Ref.
571 let ImplItemRef { id, ident: _, kind: _, span: _, vis: _, defaultness: _ } = *ii;
573 self.visit_nested_impl_item(id);
577 struct HirItemLike<T> {
581 impl<'hir, T> HashStable<StableHashingContext<'hir>> for HirItemLike<T>
583 T: HashStable<StableHashingContext<'hir>>,
585 fn hash_stable(&self, hcx: &mut StableHashingContext<'hir>, hasher: &mut StableHasher) {
586 hcx.while_hashing_hir_bodies(true, |hcx| {
587 self.item_like.hash_stable(hcx, hasher);