1 use crate::creader::{CStore, LoadedMacro};
2 use crate::foreign_modules;
3 use crate::native_libs;
6 use rustc_attr::Deprecation;
7 use rustc_hir::def::{CtorKind, DefKind, Res};
8 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LOCAL_CRATE};
9 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
10 use rustc_middle::arena::ArenaAllocatable;
11 use rustc_middle::metadata::ModChild;
12 use rustc_middle::middle::exported_symbols::ExportedSymbol;
13 use rustc_middle::middle::stability::DeprecationEntry;
14 use rustc_middle::ty::fast_reject::SimplifiedType;
15 use rustc_middle::ty::query::{ExternProviders, Providers};
16 use rustc_middle::ty::{self, TyCtxt, Visibility};
17 use rustc_session::cstore::{CrateSource, CrateStore};
18 use rustc_session::{Session, StableCrateId};
19 use rustc_span::hygiene::{ExpnHash, ExpnId};
20 use rustc_span::source_map::{Span, Spanned};
21 use rustc_span::symbol::{kw, Symbol};
23 use rustc_data_structures::sync::Lrc;
26 use super::{Decodable, DecodeContext, DecodeIterator};
28 trait ProcessQueryValue<'tcx, T> {
29 fn process_decoded(self, _tcx: TyCtxt<'tcx>, _err: impl Fn() -> !) -> T;
32 impl<T> ProcessQueryValue<'_, Option<T>> for Option<T> {
34 fn process_decoded(self, _tcx: TyCtxt<'_>, _err: impl Fn() -> !) -> Option<T> {
39 impl<T> ProcessQueryValue<'_, T> for Option<T> {
41 fn process_decoded(self, _tcx: TyCtxt<'_>, err: impl Fn() -> !) -> T {
42 if let Some(value) = self { value } else { err() }
46 impl<'tcx, T: ArenaAllocatable<'tcx>> ProcessQueryValue<'tcx, &'tcx T> for Option<T> {
48 fn process_decoded(self, tcx: TyCtxt<'tcx>, err: impl Fn() -> !) -> &'tcx T {
49 if let Some(value) = self { tcx.arena.alloc(value) } else { err() }
53 impl<T, E> ProcessQueryValue<'_, Result<Option<T>, E>> for Option<T> {
55 fn process_decoded(self, _tcx: TyCtxt<'_>, _err: impl Fn() -> !) -> Result<Option<T>, E> {
60 impl<'a, 'tcx, T: Copy + Decodable<DecodeContext<'a, 'tcx>>> ProcessQueryValue<'tcx, &'tcx [T]>
61 for Option<DecodeIterator<'a, 'tcx, T>>
64 fn process_decoded(self, tcx: TyCtxt<'tcx>, _err: impl Fn() -> !) -> &'tcx [T] {
65 if let Some(iter) = self { tcx.arena.alloc_from_iter(iter) } else { &[] }
69 impl ProcessQueryValue<'_, Option<DeprecationEntry>> for Option<Deprecation> {
71 fn process_decoded(self, _tcx: TyCtxt<'_>, _err: impl Fn() -> !) -> Option<DeprecationEntry> {
72 self.map(DeprecationEntry::external)
76 macro_rules! provide_one {
77 ($tcx:ident, $def_id:ident, $other:ident, $cdata:ident, $name:ident => { table }) => {
79 $tcx, $def_id, $other, $cdata, $name => {
84 .get($cdata, $def_id.index)
85 .map(|lazy| lazy.decode(($cdata, $tcx)))
86 .process_decoded($tcx, || panic!("{:?} does not have a {:?}", $def_id, stringify!($name)))
90 ($tcx:ident, $def_id:ident, $other:ident, $cdata:ident, $name:ident => { table_direct }) => {
92 $tcx, $def_id, $other, $cdata, $name => {
93 // We don't decode `table_direct`, since it's not a Lazy, but an actual value
98 .get($cdata, $def_id.index)
99 .process_decoded($tcx, || panic!("{:?} does not have a {:?}", $def_id, stringify!($name)))
103 ($tcx:ident, $def_id:ident, $other:ident, $cdata:ident, $name:ident => $compute:block) => {
106 def_id_arg: ty::query::query_keys::$name<'tcx>,
107 ) -> ty::query::query_values::$name<'tcx> {
109 $tcx.prof.generic_activity(concat!("metadata_decode_entry_", stringify!($name)));
111 #[allow(unused_variables)]
112 let ($def_id, $other) = def_id_arg.into_args();
113 assert!(!$def_id.is_local());
115 // External query providers call `crate_hash` in order to register a dependency
116 // on the crate metadata. The exception is `crate_hash` itself, which obviously
117 // doesn't need to do this (and can't, as it would cause a query cycle).
118 use rustc_middle::dep_graph::DepKind;
119 if DepKind::$name != DepKind::crate_hash && $tcx.dep_graph.is_fully_enabled() {
120 $tcx.ensure().crate_hash($def_id.krate);
123 let $cdata = CStore::from_tcx($tcx).get_crate_data($def_id.krate);
130 macro_rules! provide {
131 ($tcx:ident, $def_id:ident, $other:ident, $cdata:ident,
132 $($name:ident => { $($compute:tt)* })*) => {
133 pub fn provide_extern(providers: &mut ExternProviders) {
135 $tcx, $def_id, $other, $cdata, $name => { $($compute)* }
138 *providers = ExternProviders {
146 // small trait to work around different signature queries all being defined via
150 fn into_args(self) -> (DefId, Self::Other);
153 impl IntoArgs for DefId {
155 fn into_args(self) -> (DefId, ()) {
160 impl IntoArgs for CrateNum {
162 fn into_args(self) -> (DefId, ()) {
163 (self.as_def_id(), ())
167 impl IntoArgs for (CrateNum, DefId) {
169 fn into_args(self) -> (DefId, DefId) {
170 (self.0.as_def_id(), self.1)
174 impl<'tcx> IntoArgs for ty::InstanceDef<'tcx> {
176 fn into_args(self) -> (DefId, ()) {
181 impl IntoArgs for (CrateNum, SimplifiedType) {
182 type Other = SimplifiedType;
183 fn into_args(self) -> (DefId, SimplifiedType) {
184 (self.0.as_def_id(), self.1)
188 provide! { tcx, def_id, other, cdata,
189 explicit_item_bounds => { table }
190 explicit_predicates_of => { table }
191 generics_of => { table }
192 inferred_outlives_of => { table }
193 super_predicates_of => { table }
195 variances_of => { table }
197 codegen_fn_attrs => { table }
198 impl_trait_ref => { table }
199 const_param_default => { table }
200 object_lifetime_default => { table }
201 thir_abstract_const => { table }
202 optimized_mir => { table }
203 mir_for_ctfe => { table }
204 promoted_mir => { table }
205 def_span => { table }
206 def_ident_span => { table }
207 lookup_stability => { table }
208 lookup_const_stability => { table }
209 lookup_default_body_stability => { table }
210 lookup_deprecation_entry => { table }
211 params_in_repr => { table }
212 unused_generic_params => { table }
213 opt_def_kind => { table_direct }
214 impl_parent => { table }
215 impl_polarity => { table_direct }
216 impl_defaultness => { table_direct }
217 constness => { table_direct }
218 coerce_unsized_info => { table }
219 mir_const_qualif => { table }
220 rendered_const => { table }
221 asyncness => { table_direct }
222 fn_arg_names => { table }
223 generator_kind => { table }
224 trait_def => { table }
225 deduced_param_attrs => { table }
226 collect_trait_impl_trait_tys => {
230 .trait_impl_trait_tys
231 .get(cdata, def_id.index)
232 .map(|lazy| lazy.decode((cdata, tcx)))
233 .process_decoded(tcx, || panic!("{:?} does not have trait_impl_trait_tys", def_id)))
236 visibility => { cdata.get_visibility(def_id.index) }
237 adt_def => { cdata.get_adt_def(def_id.index, tcx) }
240 tcx.calculate_dtor(def_id, |_,_| Ok(()))
242 associated_item_def_ids => {
243 tcx.arena.alloc_from_iter(cdata.get_associated_item_def_ids(def_id.index, tcx.sess))
245 associated_item => { cdata.get_associated_item(def_id.index, tcx.sess) }
246 inherent_impls => { cdata.get_inherent_implementations_for_type(tcx, def_id.index) }
247 is_foreign_item => { cdata.is_foreign_item(def_id.index) }
248 item_attrs => { tcx.arena.alloc_from_iter(cdata.get_item_attrs(def_id.index, tcx.sess)) }
249 is_mir_available => { cdata.is_item_mir_available(def_id.index) }
250 is_ctfe_mir_available => { cdata.is_ctfe_mir_available(def_id.index) }
252 dylib_dependency_formats => { cdata.get_dylib_dependency_formats(tcx) }
253 is_private_dep => { cdata.private_dep }
254 is_panic_runtime => { cdata.root.panic_runtime }
255 is_compiler_builtins => { cdata.root.compiler_builtins }
256 has_global_allocator => { cdata.root.has_global_allocator }
257 has_alloc_error_handler => { cdata.root.has_alloc_error_handler }
258 has_panic_handler => { cdata.root.has_panic_handler }
259 is_profiler_runtime => { cdata.root.profiler_runtime }
260 required_panic_strategy => { cdata.root.required_panic_strategy }
261 panic_in_drop_strategy => { cdata.root.panic_in_drop_strategy }
263 let r = *cdata.extern_crate.lock();
264 r.map(|c| &*tcx.arena.alloc(c))
266 is_no_builtins => { cdata.root.no_builtins }
267 symbol_mangling_version => { cdata.root.symbol_mangling_version }
268 reachable_non_generics => {
269 let reachable_non_generics = tcx
270 .exported_symbols(cdata.cnum)
272 .filter_map(|&(exported_symbol, export_info)| {
273 if let ExportedSymbol::NonGeneric(def_id) = exported_symbol {
274 Some((def_id, export_info))
281 reachable_non_generics
283 native_libraries => { cdata.get_native_libraries(tcx.sess).collect() }
284 foreign_modules => { cdata.get_foreign_modules(tcx.sess).map(|m| (m.def_id, m)).collect() }
285 crate_hash => { cdata.root.hash }
286 crate_host_hash => { cdata.host_hash }
287 crate_name => { cdata.root.name }
289 extra_filename => { cdata.root.extra_filename.clone() }
291 traits_in_crate => { tcx.arena.alloc_from_iter(cdata.get_traits()) }
292 implementations_of_trait => { cdata.get_implementations_of_trait(tcx, other) }
293 crate_incoherent_impls => { cdata.get_incoherent_impls(tcx, other) }
296 let r = *cdata.dep_kind.lock();
300 tcx.arena.alloc_from_iter(cdata.get_module_children(def_id.index, tcx.sess))
302 defined_lib_features => { cdata.get_lib_features(tcx) }
303 stability_implications => {
304 cdata.get_stability_implications(tcx).iter().copied().collect()
306 is_intrinsic => { cdata.get_is_intrinsic(def_id.index) }
307 defined_lang_items => { cdata.get_lang_items(tcx) }
308 diagnostic_items => { cdata.get_diagnostic_items() }
309 missing_lang_items => { cdata.get_missing_lang_items(tcx) }
311 missing_extern_crate_item => {
312 let r = matches!(*cdata.extern_crate.borrow(), Some(extern_crate) if !extern_crate.is_direct());
316 used_crate_source => { Lrc::clone(&cdata.source) }
317 debugger_visualizers => { cdata.get_debugger_visualizers() }
319 exported_symbols => {
320 let syms = cdata.exported_symbols(tcx);
322 // FIXME rust-lang/rust#64319, rust-lang/rust#64872: We want
323 // to block export of generics from dylibs, but we must fix
324 // rust-lang/rust#65890 before we can do that robustly.
329 crate_extern_paths => { cdata.source().paths().cloned().collect() }
330 expn_that_defined => { cdata.get_expn_that_defined(def_id.index, tcx.sess) }
331 generator_diagnostic_data => { cdata.get_generator_diagnostic_data(tcx, def_id.index) }
334 pub(in crate::rmeta) fn provide(providers: &mut Providers) {
335 // FIXME(#44234) - almost all of these queries have no sub-queries and
336 // therefore no actual inputs, they're just reading tables calculated in
337 // resolve! Does this work? Unsure! That's what the issue is about
338 *providers = Providers {
339 allocator_kind: |tcx, ()| CStore::from_tcx(tcx).allocator_kind(),
340 alloc_error_handler_kind: |tcx, ()| CStore::from_tcx(tcx).alloc_error_handler_kind(),
341 is_private_dep: |_tcx, cnum| {
342 assert_eq!(cnum, LOCAL_CRATE);
345 native_library: |tcx, id| {
346 tcx.native_libraries(id.krate)
348 .filter(|lib| native_libs::relevant_lib(&tcx.sess, lib))
350 let Some(fm_id) = lib.foreign_module else {
353 let map = tcx.foreign_modules(id.krate);
355 .expect("failed to find foreign module")
360 native_libraries: |tcx, cnum| {
361 assert_eq!(cnum, LOCAL_CRATE);
362 native_libs::collect(tcx)
364 foreign_modules: |tcx, cnum| {
365 assert_eq!(cnum, LOCAL_CRATE);
366 foreign_modules::collect(tcx).into_iter().map(|m| (m.def_id, m)).collect()
369 // Returns a map from a sufficiently visible external item (i.e., an
370 // external item that is visible from at least one local module) to a
371 // sufficiently visible parent (considering modules that re-export the
372 // external item to be parents).
373 visible_parent_map: |tcx, ()| {
374 use std::collections::hash_map::Entry;
375 use std::collections::vec_deque::VecDeque;
377 let mut visible_parent_map: DefIdMap<DefId> = Default::default();
378 // This is a secondary visible_parent_map, storing the DefId of
379 // parents that re-export the child as `_` or module parents
380 // which are `#[doc(hidden)]`. Since we prefer paths that don't
381 // do this, merge this map at the end, only if we're missing
382 // keys from the former.
383 // This is a rudimentary check that does not catch all cases,
385 let mut fallback_map: DefIdMap<DefId> = Default::default();
387 // Issue 46112: We want the map to prefer the shortest
388 // paths when reporting the path to an item. Therefore we
389 // build up the map via a breadth-first search (BFS),
390 // which naturally yields minimal-length paths.
392 // Note that it needs to be a BFS over the whole forest of
393 // crates, not just each individual crate; otherwise you
394 // only get paths that are locally minimal with respect to
395 // whatever crate we happened to encounter first in this
396 // traversal, but not globally minimal across all crates.
397 let bfs_queue = &mut VecDeque::new();
399 for &cnum in tcx.crates(()) {
400 // Ignore crates without a corresponding local `extern crate` item.
401 if tcx.missing_extern_crate_item(cnum) {
405 bfs_queue.push_back(cnum.as_def_id());
408 let mut add_child = |bfs_queue: &mut VecDeque<_>, child: &ModChild, parent: DefId| {
409 if !child.vis.is_public() {
413 if let Some(def_id) = child.res.opt_def_id() {
414 if child.ident.name == kw::Underscore {
415 fallback_map.insert(def_id, parent);
419 if ty::util::is_doc_hidden(tcx, parent) {
420 fallback_map.insert(def_id, parent);
424 match visible_parent_map.entry(def_id) {
425 Entry::Occupied(mut entry) => {
426 // If `child` is defined in crate `cnum`, ensure
427 // that it is mapped to a parent in `cnum`.
428 if def_id.is_local() && entry.get().is_local() {
429 entry.insert(parent);
432 Entry::Vacant(entry) => {
433 entry.insert(parent);
436 Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, _)
438 bfs_queue.push_back(def_id);
445 while let Some(def) = bfs_queue.pop_front() {
446 for child in tcx.module_children(def).iter() {
447 add_child(bfs_queue, child, def);
451 // Fill in any missing entries with the less preferable path.
452 // If this path re-exports the child as `_`, we still use this
453 // path in a diagnostic that suggests importing `::*`.
454 for (child, parent) in fallback_map {
455 visible_parent_map.entry(child).or_insert(parent);
461 dependency_formats: |tcx, ()| Lrc::new(crate::dependency_format::calculate(tcx)),
462 has_global_allocator: |tcx, cnum| {
463 assert_eq!(cnum, LOCAL_CRATE);
464 CStore::from_tcx(tcx).has_global_allocator()
466 has_alloc_error_handler: |tcx, cnum| {
467 assert_eq!(cnum, LOCAL_CRATE);
468 CStore::from_tcx(tcx).has_alloc_error_handler()
470 postorder_cnums: |tcx, ()| {
472 .alloc_slice(&CStore::from_tcx(tcx).crate_dependencies_in_postorder(LOCAL_CRATE))
474 crates: |tcx, ()| tcx.arena.alloc_from_iter(CStore::from_tcx(tcx).crates_untracked()),
480 pub fn struct_field_names_untracked<'a>(
484 ) -> impl Iterator<Item = Spanned<Symbol>> + 'a {
485 self.get_crate_data(def.krate).get_struct_field_names(def.index, sess)
488 pub fn struct_field_visibilities_untracked(
491 ) -> impl Iterator<Item = Visibility<DefId>> + '_ {
492 self.get_crate_data(def.krate).get_struct_field_visibilities(def.index)
495 pub fn ctor_untracked(&self, def: DefId) -> Option<(CtorKind, DefId)> {
496 self.get_crate_data(def.krate).get_ctor(def.index)
499 pub fn visibility_untracked(&self, def: DefId) -> Visibility<DefId> {
500 self.get_crate_data(def.krate).get_visibility(def.index)
503 pub fn module_children_untracked<'a>(
507 ) -> impl Iterator<Item = ModChild> + 'a {
508 self.get_crate_data(def_id.krate).get_module_children(def_id.index, sess)
511 pub fn load_macro_untracked(&self, id: DefId, sess: &Session) -> LoadedMacro {
512 let _prof_timer = sess.prof.generic_activity("metadata_load_macro");
514 let data = self.get_crate_data(id.krate);
515 if data.root.is_proc_macro_crate() {
516 return LoadedMacro::ProcMacro(data.load_proc_macro(id.index, sess));
519 let span = data.get_span(id.index, sess);
521 LoadedMacro::MacroDef(
523 ident: data.item_ident(id.index, sess),
524 id: ast::DUMMY_NODE_ID,
526 attrs: data.get_item_attrs(id.index, sess).collect(),
527 kind: ast::ItemKind::MacroDef(data.get_macro(id.index, sess)),
528 vis: ast::Visibility {
529 span: span.shrink_to_lo(),
530 kind: ast::VisibilityKind::Inherited,
539 pub fn fn_has_self_parameter_untracked(&self, def: DefId, sess: &Session) -> bool {
540 self.get_crate_data(def.krate).get_fn_has_self_parameter(def.index, sess)
543 pub fn crate_source_untracked(&self, cnum: CrateNum) -> Lrc<CrateSource> {
544 self.get_crate_data(cnum).source.clone()
547 pub fn get_span_untracked(&self, def_id: DefId, sess: &Session) -> Span {
548 self.get_crate_data(def_id.krate).get_span(def_id.index, sess)
551 pub fn def_kind(&self, def: DefId) -> DefKind {
552 self.get_crate_data(def.krate).def_kind(def.index)
555 pub fn crates_untracked(&self) -> impl Iterator<Item = CrateNum> + '_ {
556 self.iter_crate_data().map(|(cnum, _)| cnum)
559 pub fn item_generics_num_lifetimes(&self, def_id: DefId, sess: &Session) -> usize {
560 self.get_crate_data(def_id.krate).get_generics(def_id.index, sess).own_counts().lifetimes
563 pub fn module_expansion_untracked(&self, def_id: DefId, sess: &Session) -> ExpnId {
564 self.get_crate_data(def_id.krate).module_expansion(def_id.index, sess)
567 /// Only public-facing way to traverse all the definitions in a non-local crate.
568 /// Critically useful for this third-party project: <https://github.com/hacspec/hacspec>.
569 /// See <https://github.com/rust-lang/rust/pull/85889> for context.
570 pub fn num_def_ids_untracked(&self, cnum: CrateNum) -> usize {
571 self.get_crate_data(cnum).num_def_ids()
574 pub fn item_attrs_untracked<'a>(
578 ) -> impl Iterator<Item = ast::Attribute> + 'a {
579 self.get_crate_data(def_id.krate).get_item_attrs(def_id.index, sess)
582 pub fn get_proc_macro_quoted_span_untracked(
588 self.get_crate_data(cnum).get_proc_macro_quoted_span(id, sess)
591 /// Decodes all trait impls in the crate (for rustdoc).
592 pub fn trait_impls_in_crate_untracked(
595 ) -> impl Iterator<Item = (DefId, DefId, Option<SimplifiedType>)> + '_ {
596 self.get_crate_data(cnum).get_trait_impls()
599 /// Decodes all inherent impls in the crate (for rustdoc).
600 pub fn inherent_impls_in_crate_untracked(
603 ) -> impl Iterator<Item = (DefId, DefId)> + '_ {
604 self.get_crate_data(cnum).get_inherent_impls()
607 /// Decodes all incoherent inherent impls in the crate (for rustdoc).
608 pub fn incoherent_impls_in_crate_untracked(
611 ) -> impl Iterator<Item = DefId> + '_ {
612 self.get_crate_data(cnum).get_all_incoherent_impls()
615 pub fn associated_item_def_ids_untracked<'a>(
619 ) -> impl Iterator<Item = DefId> + 'a {
620 self.get_crate_data(def_id.krate).get_associated_item_def_ids(def_id.index, sess)
623 pub fn may_have_doc_links_untracked(&self, def_id: DefId) -> bool {
624 self.get_crate_data(def_id.krate).get_may_have_doc_links(def_id.index)
628 impl CrateStore for CStore {
629 fn as_any(&self) -> &dyn Any {
632 fn untracked_as_any(&mut self) -> &mut dyn Any {
636 fn crate_name(&self, cnum: CrateNum) -> Symbol {
637 self.get_crate_data(cnum).root.name
640 fn stable_crate_id(&self, cnum: CrateNum) -> StableCrateId {
641 self.get_crate_data(cnum).root.stable_crate_id
644 fn stable_crate_id_to_crate_num(&self, stable_crate_id: StableCrateId) -> CrateNum {
645 self.stable_crate_ids[&stable_crate_id]
648 /// Returns the `DefKey` for a given `DefId`. This indicates the
649 /// parent `DefId` as well as some idea of what kind of data the
650 /// `DefId` refers to.
651 fn def_key(&self, def: DefId) -> DefKey {
652 self.get_crate_data(def.krate).def_key(def.index)
655 fn def_path(&self, def: DefId) -> DefPath {
656 self.get_crate_data(def.krate).def_path(def.index)
659 fn def_path_hash(&self, def: DefId) -> DefPathHash {
660 self.get_crate_data(def.krate).def_path_hash(def.index)
663 fn def_path_hash_to_def_id(&self, cnum: CrateNum, hash: DefPathHash) -> DefId {
664 let def_index = self.get_crate_data(cnum).def_path_hash_to_def_index(hash);
665 DefId { krate: cnum, index: def_index }
668 fn expn_hash_to_expn_id(
675 self.get_crate_data(cnum).expn_hash_to_expn_id(sess, index_guess, hash)
678 fn import_source_files(&self, sess: &Session, cnum: CrateNum) {
679 let cdata = self.get_crate_data(cnum);
680 for file_index in 0..cdata.root.source_map.size() {
681 cdata.imported_source_file(file_index as u32, sess);