2 use crate::dep_graph::{DepGraph, DepKind, DepNodeIndex};
4 use crate::hir::map::HirEntryMap;
5 use crate::hir::def_id::{LOCAL_CRATE, CrateNum};
6 use crate::hir::intravisit::{Visitor, NestedVisitorMap};
7 use rustc_data_structures::svh::Svh;
8 use rustc_data_structures::indexed_vec::IndexVec;
9 use crate::ich::Fingerprint;
10 use crate::middle::cstore::CrateStore;
11 use crate::session::CrateDisambiguator;
12 use crate::session::Session;
13 use crate::util::nodemap::FxHashMap;
14 use syntax::ast::NodeId;
15 use syntax::source_map::SourceMap;
17 use std::iter::repeat;
19 use crate::ich::StableHashingContext;
20 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, StableHasherResult};
22 /// A visitor that walks over the HIR and collects `Node`s into a HIR map.
23 pub(super) struct NodeCollector<'a, 'hir> {
28 source_map: &'a SourceMap,
31 map: HirEntryMap<'hir>,
32 /// The parent of this node
33 parent_node: hir::HirId,
35 // These fields keep track of the currently relevant DepNodes during
36 // the visitor's traversal.
37 current_dep_node_owner: DefIndex,
38 current_signature_dep_index: DepNodeIndex,
39 current_full_dep_index: DepNodeIndex,
40 currently_in_body: bool,
42 dep_graph: &'a DepGraph,
43 definitions: &'a definitions::Definitions,
44 hir_to_node_id: &'a FxHashMap<HirId, NodeId>,
46 hcx: StableHashingContext<'a>,
48 // We are collecting `DepNode::HirBody` hashes here so we can compute the
49 // crate hash from then later on.
50 hir_body_nodes: Vec<(DefPathHash, Fingerprint)>,
53 fn input_dep_node_and_hash<I>(
55 hcx: &mut StableHashingContext<'_>,
58 ) -> (DepNodeIndex, Fingerprint)
60 I: for<'a> HashStable<StableHashingContext<'a>>,
62 let dep_node_index = dep_graph.input_task(dep_node, &mut *hcx, &input).1;
64 let hash = if dep_graph.is_fully_enabled() {
65 dep_graph.fingerprint_of(dep_node_index)
67 let mut stable_hasher = StableHasher::new();
68 input.hash_stable(hcx, &mut stable_hasher);
69 stable_hasher.finish()
72 (dep_node_index, hash)
75 fn alloc_hir_dep_nodes<I>(
77 hcx: &mut StableHashingContext<'_>,
78 def_path_hash: DefPathHash,
80 hir_body_nodes: &mut Vec<(DefPathHash, Fingerprint)>,
81 ) -> (DepNodeIndex, DepNodeIndex)
83 I: for<'a> HashStable<StableHashingContext<'a>>,
85 let sig = dep_graph.input_task(
86 def_path_hash.to_dep_node(DepKind::Hir),
88 HirItemLike { item_like: &item_like, hash_bodies: false },
90 let (full, hash) = input_dep_node_and_hash(
93 def_path_hash.to_dep_node(DepKind::HirBody),
94 HirItemLike { item_like: &item_like, hash_bodies: true },
96 hir_body_nodes.push((def_path_hash, hash));
100 impl<'a, 'hir> NodeCollector<'a, 'hir> {
101 pub(super) fn root(sess: &'a Session,
103 dep_graph: &'a DepGraph,
104 definitions: &'a definitions::Definitions,
105 hir_to_node_id: &'a FxHashMap<HirId, NodeId>,
106 mut hcx: StableHashingContext<'a>)
107 -> NodeCollector<'a, 'hir> {
108 let root_mod_def_path_hash = definitions.def_path_hash(CRATE_DEF_INDEX);
110 let mut hir_body_nodes = Vec::new();
112 // Allocate `DepNode`s for the root module.
113 let (root_mod_sig_dep_index, root_mod_full_dep_index) = {
116 // Crate attributes are not copied over to the root `Mod`, so hash
117 // them explicitly here.
120 // These fields are handled separately:
122 non_exported_macro_attrs: _,
135 root_mod_def_path_hash,
136 (module, attrs, span),
142 dep_graph.input_task(
143 DepNode::new_no_params(DepKind::AllLocalTraitImpls),
149 let mut collector = NodeCollector {
151 source_map: sess.source_map(),
152 map: vec![None; definitions.def_index_count()],
153 parent_node: hir::CRATE_HIR_ID,
154 current_signature_dep_index: root_mod_sig_dep_index,
155 current_full_dep_index: root_mod_full_dep_index,
156 current_dep_node_owner: CRATE_DEF_INDEX,
157 currently_in_body: false,
164 collector.insert_entry(hir::CRATE_HIR_ID, Entry {
165 parent: hir::CRATE_HIR_ID,
166 dep_node: root_mod_sig_dep_index,
173 pub(super) fn finalize_and_compute_crate_hash(mut self,
174 crate_disambiguator: CrateDisambiguator,
175 cstore: &dyn CrateStore,
176 commandline_args_hash: u64)
177 -> (HirEntryMap<'hir>, Svh)
179 self.hir_body_nodes.sort_unstable_by_key(|bn| bn.0);
181 let node_hashes = self
184 .fold(Fingerprint::ZERO, |combined_fingerprint, &(def_path_hash, fingerprint)| {
185 combined_fingerprint.combine(def_path_hash.0.combine(fingerprint))
188 let mut upstream_crates: Vec<_> = cstore.crates_untracked().iter().map(|&cnum| {
189 let name = cstore.crate_name_untracked(cnum).as_str();
190 let disambiguator = cstore.crate_disambiguator_untracked(cnum).to_fingerprint();
191 let hash = cstore.crate_hash_untracked(cnum);
192 (name, disambiguator, hash)
195 upstream_crates.sort_unstable_by_key(|&(name, dis, _)| (name, dis));
197 // We hash the final, remapped names of all local source files so we
198 // don't have to include the path prefix remapping commandline args.
199 // If we included the full mapping in the SVH, we could only have
200 // reproducible builds by compiling from the same directory. So we just
201 // hash the result of the mapping instead of the mapping itself.
202 let mut source_file_names: Vec<_> = self
206 .filter(|source_file| CrateNum::from_u32(source_file.crate_of_origin) == LOCAL_CRATE)
207 .map(|source_file| source_file.name_hash)
210 source_file_names.sort_unstable();
212 let crate_hash_input = (
213 ((node_hashes, upstream_crates), source_file_names),
214 (commandline_args_hash, crate_disambiguator.to_fingerprint())
217 let (_, crate_hash) = input_dep_node_and_hash(
220 DepNode::new_no_params(DepKind::Krate),
224 let svh = Svh::new(crate_hash.to_smaller_hash());
228 fn insert_entry(&mut self, id: HirId, entry: Entry<'hir>) {
229 debug!("hir_map: {:?} => {:?}", id, entry);
230 let local_map = &mut self.map[id.owner.index()];
231 let i = id.local_id.as_u32() as usize;
232 if local_map.is_none() {
233 *local_map = Some(IndexVec::with_capacity(i + 1));
235 let local_map = local_map.as_mut().unwrap();
236 let len = local_map.len();
238 local_map.extend(repeat(None).take(i - len + 1));
240 local_map[id.local_id] = Some(entry);
243 fn insert(&mut self, span: Span, hir_id: HirId, node: Node<'hir>) {
245 parent: self.parent_node,
246 dep_node: if self.currently_in_body {
247 self.current_full_dep_index
249 self.current_signature_dep_index
254 // Make sure that the DepNode of some node coincides with the HirId
255 // owner of that node.
256 if cfg!(debug_assertions) {
257 let node_id = self.hir_to_node_id[&hir_id];
258 assert_eq!(self.definitions.node_to_hir_id(node_id), hir_id);
260 if hir_id.owner != self.current_dep_node_owner {
261 let node_str = match self.definitions.opt_def_index(node_id) {
263 self.definitions.def_path(def_index).to_string_no_crate()
265 None => format!("{:?}", node)
268 let forgot_str = if hir_id == crate::hir::DUMMY_HIR_ID {
269 format!("\nMaybe you forgot to lower the node id {:?}?", node_id)
276 "inconsistent DepNode at `{:?}` for `{}`: \
277 current_dep_node_owner={} ({:?}), hir_id.owner={} ({:?}){}",
278 self.source_map.span_to_string(span),
281 .def_path(self.current_dep_node_owner)
282 .to_string_no_crate(),
283 self.current_dep_node_owner,
284 self.definitions.def_path(hir_id.owner).to_string_no_crate(),
291 self.insert_entry(hir_id, entry);
294 fn with_parent<F: FnOnce(&mut Self)>(
296 parent_node_id: HirId,
299 let parent_node = self.parent_node;
300 self.parent_node = parent_node_id;
302 self.parent_node = parent_node;
305 fn with_dep_node_owner<T: for<'b> HashStable<StableHashingContext<'b>>,
306 F: FnOnce(&mut Self)>(&mut self,
307 dep_node_owner: DefIndex,
310 let prev_owner = self.current_dep_node_owner;
311 let prev_signature_dep_index = self.current_signature_dep_index;
312 let prev_full_dep_index = self.current_full_dep_index;
313 let prev_in_body = self.currently_in_body;
315 let def_path_hash = self.definitions.def_path_hash(dep_node_owner);
317 let (signature_dep_index, full_dep_index) = alloc_hir_dep_nodes(
322 &mut self.hir_body_nodes,
324 self.current_signature_dep_index = signature_dep_index;
325 self.current_full_dep_index = full_dep_index;
327 self.current_dep_node_owner = dep_node_owner;
328 self.currently_in_body = false;
330 self.currently_in_body = prev_in_body;
331 self.current_dep_node_owner = prev_owner;
332 self.current_full_dep_index = prev_full_dep_index;
333 self.current_signature_dep_index = prev_signature_dep_index;
337 impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
338 /// Because we want to track parent items and so forth, enable
339 /// deep walking so that we walk nested items in the context of
340 /// their outer items.
342 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'hir> {
343 panic!("visit_nested_xxx must be manually implemented in this visitor")
346 fn visit_nested_item(&mut self, item: ItemId) {
347 debug!("visit_nested_item: {:?}", item);
348 self.visit_item(self.krate.item(item.id));
351 fn visit_nested_trait_item(&mut self, item_id: TraitItemId) {
352 self.visit_trait_item(self.krate.trait_item(item_id));
355 fn visit_nested_impl_item(&mut self, item_id: ImplItemId) {
356 self.visit_impl_item(self.krate.impl_item(item_id));
359 fn visit_nested_body(&mut self, id: BodyId) {
360 let prev_in_body = self.currently_in_body;
361 self.currently_in_body = true;
362 self.visit_body(self.krate.body(id));
363 self.currently_in_body = prev_in_body;
366 fn visit_item(&mut self, i: &'hir Item) {
367 debug!("visit_item: {:?}", i);
368 debug_assert_eq!(i.hir_id.owner,
369 self.definitions.opt_def_index(self.hir_to_node_id[&i.hir_id]).unwrap());
370 self.with_dep_node_owner(i.hir_id.owner, i, |this| {
371 this.insert(i.span, i.hir_id, Node::Item(i));
372 this.with_parent(i.hir_id, |this| {
373 if let ItemKind::Struct(ref struct_def, _) = i.node {
374 // If this is a tuple or unit-like struct, register the constructor.
375 if let Some(ctor_hir_id) = struct_def.ctor_hir_id() {
376 this.insert(i.span, ctor_hir_id, Node::Ctor(struct_def));
379 intravisit::walk_item(this, i);
384 fn visit_foreign_item(&mut self, foreign_item: &'hir ForeignItem) {
385 self.insert(foreign_item.span, foreign_item.hir_id, Node::ForeignItem(foreign_item));
387 self.with_parent(foreign_item.hir_id, |this| {
388 intravisit::walk_foreign_item(this, foreign_item);
392 fn visit_generic_param(&mut self, param: &'hir GenericParam) {
393 self.insert(param.span, param.hir_id, Node::GenericParam(param));
394 intravisit::walk_generic_param(self, param);
397 fn visit_trait_item(&mut self, ti: &'hir TraitItem) {
398 debug_assert_eq!(ti.hir_id.owner,
399 self.definitions.opt_def_index(self.hir_to_node_id[&ti.hir_id]).unwrap());
400 self.with_dep_node_owner(ti.hir_id.owner, ti, |this| {
401 this.insert(ti.span, ti.hir_id, Node::TraitItem(ti));
403 this.with_parent(ti.hir_id, |this| {
404 intravisit::walk_trait_item(this, ti);
409 fn visit_impl_item(&mut self, ii: &'hir ImplItem) {
410 debug_assert_eq!(ii.hir_id.owner,
411 self.definitions.opt_def_index(self.hir_to_node_id[&ii.hir_id]).unwrap());
412 self.with_dep_node_owner(ii.hir_id.owner, ii, |this| {
413 this.insert(ii.span, ii.hir_id, Node::ImplItem(ii));
415 this.with_parent(ii.hir_id, |this| {
416 intravisit::walk_impl_item(this, ii);
421 fn visit_pat(&mut self, pat: &'hir Pat) {
422 let node = if let PatKind::Binding(..) = pat.node {
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) {
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) {
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) {
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) {
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) {
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) {
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);
491 fn visit_fn(&mut self, fk: intravisit::FnKind<'hir>, fd: &'hir FnDecl,
492 b: BodyId, s: Span, id: HirId) {
493 assert_eq!(self.parent_node, id);
494 intravisit::walk_fn(self, fk, fd, b, s, id);
497 fn visit_block(&mut self, block: &'hir Block) {
498 self.insert(block.span, block.hir_id, Node::Block(block));
499 self.with_parent(block.hir_id, |this| {
500 intravisit::walk_block(this, block);
504 fn visit_local(&mut self, l: &'hir Local) {
505 self.insert(l.span, l.hir_id, Node::Local(l));
506 self.with_parent(l.hir_id, |this| {
507 intravisit::walk_local(this, l)
511 fn visit_lifetime(&mut self, lifetime: &'hir Lifetime) {
512 self.insert(lifetime.span, lifetime.hir_id, Node::Lifetime(lifetime));
515 fn visit_vis(&mut self, visibility: &'hir Visibility) {
516 match visibility.node {
517 VisibilityKind::Public |
518 VisibilityKind::Crate(_) |
519 VisibilityKind::Inherited => {}
520 VisibilityKind::Restricted { hir_id, .. } => {
521 self.insert(visibility.span, hir_id, Node::Visibility(visibility));
522 self.with_parent(hir_id, |this| {
523 intravisit::walk_vis(this, visibility);
529 fn visit_macro_def(&mut self, macro_def: &'hir MacroDef) {
530 let node_id = self.hir_to_node_id[¯o_def.hir_id];
531 let def_index = self.definitions.opt_def_index(node_id).unwrap();
533 self.with_dep_node_owner(def_index, macro_def, |this| {
534 this.insert(macro_def.span, macro_def.hir_id, Node::MacroDef(macro_def));
538 fn visit_variant(&mut self, v: &'hir Variant, g: &'hir Generics, item_id: HirId) {
539 self.insert(v.span, v.node.id, Node::Variant(v));
540 self.with_parent(v.node.id, |this| {
541 // Register the constructor of this variant.
542 if let Some(ctor_hir_id) = v.node.data.ctor_hir_id() {
543 this.insert(v.span, ctor_hir_id, Node::Ctor(&v.node.data));
545 intravisit::walk_variant(this, v, g, item_id);
549 fn visit_struct_field(&mut self, field: &'hir StructField) {
550 self.insert(field.span, field.hir_id, Node::Field(field));
551 self.with_parent(field.hir_id, |this| {
552 intravisit::walk_struct_field(this, field);
556 fn visit_trait_item_ref(&mut self, ii: &'hir TraitItemRef) {
557 // Do not visit the duplicate information in TraitItemRef. We want to
558 // map the actual nodes, not the duplicate ones in the *Ref.
567 self.visit_nested_trait_item(id);
570 fn visit_impl_item_ref(&mut self, ii: &'hir ImplItemRef) {
571 // Do not visit the duplicate information in ImplItemRef. We want to
572 // map the actual nodes, not the duplicate ones in the *Ref.
582 self.visit_nested_impl_item(id);
586 // This is a wrapper structure that allows determining if span values within
587 // the wrapped item should be hashed or not.
588 struct HirItemLike<T> {
593 impl<'hir, T> HashStable<StableHashingContext<'hir>> for HirItemLike<T>
595 T: HashStable<StableHashingContext<'hir>>,
597 fn hash_stable<W: StableHasherResult>(&self,
598 hcx: &mut StableHashingContext<'hir>,
599 hasher: &mut StableHasher<W>) {
600 hcx.while_hashing_hir_bodies(self.hash_bodies, |hcx| {
601 self.item_like.hash_stable(hcx, hasher);