compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

   1 use super::LazyQueryDecodable;
   2 use crate::creader::{CStore, LoadedMacro};
   3 use crate::foreign_modules;
   4 use crate::native_libs;
   5
   6 use rustc_ast as ast;
   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::metadata::ModChild;
  11 use rustc_middle::middle::exported_symbols::ExportedSymbol;
  12 use rustc_middle::ty::fast_reject::SimplifiedType;
  13 use rustc_middle::ty::query::{ExternProviders, Providers};
  14 use rustc_middle::ty::{self, TyCtxt, Visibility};
  15 use rustc_session::cstore::{CrateSource, CrateStore};
  16 use rustc_session::utils::NativeLibKind;
  17 use rustc_session::{Session, StableCrateId};
  18 use rustc_span::hygiene::{ExpnHash, ExpnId};
  19 use rustc_span::source_map::{Span, Spanned};
  20 use rustc_span::symbol::{kw, Symbol};
  21
  22 use rustc_data_structures::sync::Lrc;
  23 use smallvec::SmallVec;
  24 use std::any::Any;
  25
  26 macro_rules! provide_one {
  27     (<$lt:tt> $tcx:ident, $def_id:ident, $other:ident, $cdata:ident, $name:ident => { table }) => {
  28         provide_one! {
  29             <$lt> $tcx, $def_id, $other, $cdata, $name => {
  30                 $cdata.root.tables.$name.get($cdata, $def_id.index).decode_query(
  31                     $cdata,
  32                     $tcx,
  33                     || panic!("{:?} does not have a {:?}", $def_id, stringify!($name)),
  34                 )
  35             }
  36         }
  37     };
  38     (<$lt:tt> $tcx:ident, $def_id:ident, $other:ident, $cdata:ident, $name:ident => $compute:block) => {
  39         fn $name<$lt>(
  40             $tcx: TyCtxt<$lt>,
  41             def_id_arg: ty::query::query_keys::$name<$lt>,
  42         ) -> ty::query::query_values::$name<$lt> {
  43             let _prof_timer =
  44                 $tcx.prof.generic_activity(concat!("metadata_decode_entry_", stringify!($name)));
  45
  46             #[allow(unused_variables)]
  47             let ($def_id, $other) = def_id_arg.into_args();
  48             assert!(!$def_id.is_local());
  49
  50             // External query providers call `crate_hash` in order to register a dependency
  51             // on the crate metadata. The exception is `crate_hash` itself, which obviously
  52             // doesn't need to do this (and can't, as it would cause a query cycle).
  53             use rustc_middle::dep_graph::DepKind;
  54             if DepKind::$name != DepKind::crate_hash && $tcx.dep_graph.is_fully_enabled() {
  55                 $tcx.ensure().crate_hash($def_id.krate);
  56             }
  57
  58             let $cdata = CStore::from_tcx($tcx).get_crate_data($def_id.krate);
  59
  60             $compute
  61         }
  62     };
  63 }
  64
  65 macro_rules! provide {
  66     (<$lt:tt> $tcx:ident, $def_id:ident, $other:ident, $cdata:ident,
  67       $($name:ident => { $($compute:tt)* })*) => {
  68         pub fn provide_extern(providers: &mut ExternProviders) {
  69             $(provide_one! {
  70                 <$lt> $tcx, $def_id, $other, $cdata, $name => { $($compute)* }
  71             })*
  72
  73             *providers = ExternProviders {
  74                 $($name,)*
  75                 ..*providers
  76             };
  77         }
  78     }
  79 }
  80
  81 // small trait to work around different signature queries all being defined via
  82 // the macro above.
  83 trait IntoArgs {
  84     type Other;
  85     fn into_args(self) -> (DefId, Self::Other);
  86 }
  87
  88 impl IntoArgs for DefId {
  89     type Other = ();
  90     fn into_args(self) -> (DefId, ()) {
  91         (self, ())
  92     }
  93 }
  94
  95 impl IntoArgs for CrateNum {
  96     type Other = ();
  97     fn into_args(self) -> (DefId, ()) {
  98         (self.as_def_id(), ())
  99     }
 100 }
 101
 102 impl IntoArgs for (CrateNum, DefId) {
 103     type Other = DefId;
 104     fn into_args(self) -> (DefId, DefId) {
 105         (self.0.as_def_id(), self.1)
 106     }
 107 }
 108
 109 impl<'tcx> IntoArgs for ty::InstanceDef<'tcx> {
 110     type Other = ();
 111     fn into_args(self) -> (DefId, ()) {
 112         (self.def_id(), ())
 113     }
 114 }
 115
 116 impl IntoArgs for (CrateNum, SimplifiedType) {
 117     type Other = SimplifiedType;
 118     fn into_args(self) -> (DefId, SimplifiedType) {
 119         (self.0.as_def_id(), self.1)
 120     }
 121 }
 122
 123 provide! { <'tcx> tcx, def_id, other, cdata,
 124     explicit_item_bounds => { table }
 125     explicit_predicates_of => { table }
 126     generics_of => { table }
 127     inferred_outlives_of => { table }
 128     super_predicates_of => { table }
 129     type_of => { table }
 130     variances_of => { table }
 131     fn_sig => { table }
 132     codegen_fn_attrs => { table }
 133     impl_trait_ref => { table }
 134     const_param_default => { table }
 135     thir_abstract_const => { table }
 136     optimized_mir => { table }
 137     mir_for_ctfe => { table }
 138     promoted_mir => { table }
 139     def_span => { table }
 140     def_ident_span => { table }
 141     lookup_stability => { table }
 142     lookup_const_stability => { table }
 143     lookup_deprecation_entry => { table }
 144     visibility => { table }
 145     unused_generic_params => { table }
 146     opt_def_kind => { table }
 147     impl_parent => { table }
 148     impl_polarity => { table }
 149     impl_defaultness => { table }
 150     impl_constness => { table }
 151     coerce_unsized_info => { table }
 152     mir_const_qualif => { table }
 153     rendered_const => { table }
 154     asyncness => { table }
 155     fn_arg_names => { table }
 156     generator_kind => { table }
 157     trait_def => { table }
 158
 159     adt_def => { cdata.get_adt_def(def_id.index, tcx) }
 160     adt_destructor => {
 161         let _ = cdata;
 162         tcx.calculate_dtor(def_id, |_,_| Ok(()))
 163     }
 164     associated_item_def_ids => {
 165         tcx.arena.alloc_from_iter(cdata.get_associated_item_def_ids(def_id.index, tcx.sess))
 166     }
 167     associated_item => { cdata.get_associated_item(def_id.index) }
 168     inherent_impls => { cdata.get_inherent_implementations_for_type(tcx, def_id.index) }
 169     is_foreign_item => { cdata.is_foreign_item(def_id.index) }
 170     item_attrs => { tcx.arena.alloc_from_iter(cdata.get_item_attrs(def_id.index, tcx.sess)) }
 171     trait_of_item => { cdata.get_trait_of_item(def_id.index) }
 172     is_mir_available => { cdata.is_item_mir_available(def_id.index) }
 173     is_ctfe_mir_available => { cdata.is_ctfe_mir_available(def_id.index) }
 174
 175     dylib_dependency_formats => { cdata.get_dylib_dependency_formats(tcx) }
 176     is_private_dep => { cdata.private_dep }
 177     is_panic_runtime => { cdata.root.panic_runtime }
 178     is_compiler_builtins => { cdata.root.compiler_builtins }
 179     has_global_allocator => { cdata.root.has_global_allocator }
 180     has_panic_handler => { cdata.root.has_panic_handler }
 181     is_profiler_runtime => { cdata.root.profiler_runtime }
 182     panic_strategy => { cdata.root.panic_strategy }
 183     panic_in_drop_strategy => { cdata.root.panic_in_drop_strategy }
 184     extern_crate => {
 185         let r = *cdata.extern_crate.lock();
 186         r.map(|c| &*tcx.arena.alloc(c))
 187     }
 188     is_no_builtins => { cdata.root.no_builtins }
 189     symbol_mangling_version => { cdata.root.symbol_mangling_version }
 190     reachable_non_generics => {
 191         let reachable_non_generics = tcx
 192             .exported_symbols(cdata.cnum)
 193             .iter()
 194             .filter_map(|&(exported_symbol, export_info)| {
 195                 if let ExportedSymbol::NonGeneric(def_id) = exported_symbol {
 196                     Some((def_id, export_info))
 197                 } else {
 198                     None
 199                 }
 200             })
 201             .collect();
 202
 203         reachable_non_generics
 204     }
 205     native_libraries => { cdata.get_native_libraries(tcx.sess).collect() }
 206     foreign_modules => { cdata.get_foreign_modules(tcx.sess).map(|m| (m.def_id, m)).collect() }
 207     crate_hash => { cdata.root.hash }
 208     crate_host_hash => { cdata.host_hash }
 209     crate_name => { cdata.root.name }
 210
 211     extra_filename => { cdata.root.extra_filename.clone() }
 212
 213     traits_in_crate => { tcx.arena.alloc_from_iter(cdata.get_traits()) }
 214     implementations_of_trait => { cdata.get_implementations_of_trait(tcx, other) }
 215     crate_incoherent_impls => { cdata.get_incoherent_impls(tcx, other) }
 216
 217     dep_kind => {
 218         let r = *cdata.dep_kind.lock();
 219         r
 220     }
 221     module_children => {
 222         let mut result = SmallVec::<[_; 8]>::new();
 223         cdata.for_each_module_child(def_id.index, |child| result.push(child), tcx.sess);
 224         tcx.arena.alloc_slice(&result)
 225     }
 226     defined_lib_features => { cdata.get_lib_features(tcx) }
 227     defined_lang_items => { cdata.get_lang_items(tcx) }
 228     diagnostic_items => { cdata.get_diagnostic_items() }
 229     missing_lang_items => { cdata.get_missing_lang_items(tcx) }
 230
 231     missing_extern_crate_item => {
 232         let r = matches!(*cdata.extern_crate.borrow(), Some(extern_crate) if !extern_crate.is_direct());
 233         r
 234     }
 235
 236     used_crate_source => { Lrc::clone(&cdata.source) }
 237     debugger_visualizers => { cdata.get_debugger_visualizers() }
 238
 239     exported_symbols => {
 240         let syms = cdata.exported_symbols(tcx);
 241
 242         // FIXME rust-lang/rust#64319, rust-lang/rust#64872: We want
 243         // to block export of generics from dylibs, but we must fix
 244         // rust-lang/rust#65890 before we can do that robustly.
 245
 246         syms
 247     }
 248
 249     crate_extern_paths => { cdata.source().paths().cloned().collect() }
 250     expn_that_defined => { cdata.get_expn_that_defined(def_id.index, tcx.sess) }
 251     generator_diagnostic_data => { cdata.get_generator_diagnostic_data(tcx, def_id.index) }
 252 }
 253
 254 pub(in crate::rmeta) fn provide(providers: &mut Providers) {
 255     // FIXME(#44234) - almost all of these queries have no sub-queries and
 256     // therefore no actual inputs, they're just reading tables calculated in
 257     // resolve! Does this work? Unsure! That's what the issue is about
 258     *providers = Providers {
 259         allocator_kind: |tcx, ()| CStore::from_tcx(tcx).allocator_kind(),
 260         is_dllimport_foreign_item: |tcx, id| match tcx.native_library_kind(id) {
 261             Some(
 262                 NativeLibKind::Dylib { .. } | NativeLibKind::RawDylib | NativeLibKind::Unspecified,
 263             ) => true,
 264             _ => false,
 265         },
 266         is_statically_included_foreign_item: |tcx, id| {
 267             matches!(tcx.native_library_kind(id), Some(NativeLibKind::Static { .. }))
 268         },
 269         is_private_dep: |_tcx, cnum| {
 270             assert_eq!(cnum, LOCAL_CRATE);
 271             false
 272         },
 273         native_library_kind: |tcx, id| {
 274             tcx.native_libraries(id.krate)
 275                 .iter()
 276                 .filter(|lib| native_libs::relevant_lib(&tcx.sess, lib))
 277                 .find(|lib| {
 278                     let Some(fm_id) = lib.foreign_module else {
 279                         return false;
 280                     };
 281                     let map = tcx.foreign_modules(id.krate);
 282                     map.get(&fm_id)
 283                         .expect("failed to find foreign module")
 284                         .foreign_items
 285                         .contains(&id)
 286                 })
 287                 .map(|l| l.kind)
 288         },
 289         native_libraries: |tcx, cnum| {
 290             assert_eq!(cnum, LOCAL_CRATE);
 291             native_libs::collect(tcx)
 292         },
 293         foreign_modules: |tcx, cnum| {
 294             assert_eq!(cnum, LOCAL_CRATE);
 295             foreign_modules::collect(tcx).into_iter().map(|m| (m.def_id, m)).collect()
 296         },
 297
 298         // Returns a map from a sufficiently visible external item (i.e., an
 299         // external item that is visible from at least one local module) to a
 300         // sufficiently visible parent (considering modules that re-export the
 301         // external item to be parents).
 302         visible_parent_map: |tcx, ()| {
 303             use std::collections::hash_map::Entry;
 304             use std::collections::vec_deque::VecDeque;
 305
 306             let mut visible_parent_map: DefIdMap<DefId> = Default::default();
 307             // This is a secondary visible_parent_map, storing the DefId of parents that re-export
 308             // the child as `_`. Since we prefer parents that don't do this, merge this map at the
 309             // end, only if we're missing any keys from the former.
 310             let mut fallback_map: DefIdMap<DefId> = Default::default();
 311
 312             // Issue 46112: We want the map to prefer the shortest
 313             // paths when reporting the path to an item. Therefore we
 314             // build up the map via a breadth-first search (BFS),
 315             // which naturally yields minimal-length paths.
 316             //
 317             // Note that it needs to be a BFS over the whole forest of
 318             // crates, not just each individual crate; otherwise you
 319             // only get paths that are locally minimal with respect to
 320             // whatever crate we happened to encounter first in this
 321             // traversal, but not globally minimal across all crates.
 322             let bfs_queue = &mut VecDeque::new();
 323
 324             for &cnum in tcx.crates(()) {
 325                 // Ignore crates without a corresponding local `extern crate` item.
 326                 if tcx.missing_extern_crate_item(cnum) {
 327                     continue;
 328                 }
 329
 330                 bfs_queue.push_back(cnum.as_def_id());
 331             }
 332
 333             let mut add_child = |bfs_queue: &mut VecDeque<_>, child: &ModChild, parent: DefId| {
 334                 if !child.vis.is_public() {
 335                     return;
 336                 }
 337
 338                 if let Some(def_id) = child.res.opt_def_id() {
 339                     if child.ident.name == kw::Underscore {
 340                         fallback_map.insert(def_id, parent);
 341                         return;
 342                     }
 343
 344                     match visible_parent_map.entry(def_id) {
 345                         Entry::Occupied(mut entry) => {
 346                             // If `child` is defined in crate `cnum`, ensure
 347                             // that it is mapped to a parent in `cnum`.
 348                             if def_id.is_local() && entry.get().is_local() {
 349                                 entry.insert(parent);
 350                             }
 351                         }
 352                         Entry::Vacant(entry) => {
 353                             entry.insert(parent);
 354                             if matches!(
 355                                 child.res,
 356                                 Res::Def(DefKind::Mod | DefKind::Enum | DefKind::Trait, _)
 357                             ) {
 358                                 bfs_queue.push_back(def_id);
 359                             }
 360                         }
 361                     }
 362                 }
 363             };
 364
 365             while let Some(def) = bfs_queue.pop_front() {
 366                 for child in tcx.module_children(def).iter() {
 367                     add_child(bfs_queue, child, def);
 368                 }
 369             }
 370
 371             // Fill in any missing entries with the (less preferable) path ending in `::_`.
 372             // We still use this path in a diagnostic that suggests importing `::*`.
 373             for (child, parent) in fallback_map {
 374                 visible_parent_map.entry(child).or_insert(parent);
 375             }
 376
 377             visible_parent_map
 378         },
 379
 380         dependency_formats: |tcx, ()| Lrc::new(crate::dependency_format::calculate(tcx)),
 381         has_global_allocator: |tcx, cnum| {
 382             assert_eq!(cnum, LOCAL_CRATE);
 383             CStore::from_tcx(tcx).has_global_allocator()
 384         },
 385         postorder_cnums: |tcx, ()| {
 386             tcx.arena
 387                 .alloc_slice(&CStore::from_tcx(tcx).crate_dependencies_in_postorder(LOCAL_CRATE))
 388         },
 389         crates: |tcx, ()| tcx.arena.alloc_from_iter(CStore::from_tcx(tcx).crates_untracked()),
 390         ..*providers
 391     };
 392 }
 393
 394 impl CStore {
 395     pub fn struct_field_names_untracked<'a>(
 396         &'a self,
 397         def: DefId,
 398         sess: &'a Session,
 399     ) -> impl Iterator<Item = Spanned<Symbol>> + 'a {
 400         self.get_crate_data(def.krate).get_struct_field_names(def.index, sess)
 401     }
 402
 403     pub fn struct_field_visibilities_untracked(
 404         &self,
 405         def: DefId,
 406     ) -> impl Iterator<Item = Visibility> + '_ {
 407         self.get_crate_data(def.krate).get_struct_field_visibilities(def.index)
 408     }
 409
 410     pub fn ctor_def_id_and_kind_untracked(&self, def: DefId) -> Option<(DefId, CtorKind)> {
 411         self.get_crate_data(def.krate).get_ctor_def_id_and_kind(def.index)
 412     }
 413
 414     pub fn visibility_untracked(&self, def: DefId) -> Visibility {
 415         self.get_crate_data(def.krate).get_visibility(def.index)
 416     }
 417
 418     pub fn module_children_untracked(&self, def_id: DefId, sess: &Session) -> Vec<ModChild> {
 419         let mut result = vec![];
 420         self.get_crate_data(def_id.krate).for_each_module_child(
 421             def_id.index,
 422             |child| result.push(child),
 423             sess,
 424         );
 425         result
 426     }
 427
 428     pub fn load_macro_untracked(&self, id: DefId, sess: &Session) -> LoadedMacro {
 429         let _prof_timer = sess.prof.generic_activity("metadata_load_macro");
 430
 431         let data = self.get_crate_data(id.krate);
 432         if data.root.is_proc_macro_crate() {
 433             return LoadedMacro::ProcMacro(data.load_proc_macro(id.index, sess));
 434         }
 435
 436         let span = data.get_span(id.index, sess);
 437
 438         LoadedMacro::MacroDef(
 439             ast::Item {
 440                 ident: data.item_ident(id.index, sess),
 441                 id: ast::DUMMY_NODE_ID,
 442                 span,
 443                 attrs: data.get_item_attrs(id.index, sess).collect(),
 444                 kind: ast::ItemKind::MacroDef(data.get_macro(id.index, sess)),
 445                 vis: ast::Visibility {
 446                     span: span.shrink_to_lo(),
 447                     kind: ast::VisibilityKind::Inherited,
 448                     tokens: None,
 449                 },
 450                 tokens: None,
 451             },
 452             data.root.edition,
 453         )
 454     }
 455
 456     pub fn fn_has_self_parameter_untracked(&self, def: DefId) -> bool {
 457         self.get_crate_data(def.krate).get_fn_has_self_parameter(def.index)
 458     }
 459
 460     pub fn crate_source_untracked(&self, cnum: CrateNum) -> Lrc<CrateSource> {
 461         self.get_crate_data(cnum).source.clone()
 462     }
 463
 464     pub fn get_span_untracked(&self, def_id: DefId, sess: &Session) -> Span {
 465         self.get_crate_data(def_id.krate).get_span(def_id.index, sess)
 466     }
 467
 468     pub fn def_kind(&self, def: DefId) -> DefKind {
 469         self.get_crate_data(def.krate).def_kind(def.index)
 470     }
 471
 472     pub fn crates_untracked(&self) -> impl Iterator<Item = CrateNum> + '_ {
 473         self.iter_crate_data().map(|(cnum, _)| cnum)
 474     }
 475
 476     pub fn item_generics_num_lifetimes(&self, def_id: DefId, sess: &Session) -> usize {
 477         self.get_crate_data(def_id.krate).get_generics(def_id.index, sess).own_counts().lifetimes
 478     }
 479
 480     pub fn module_expansion_untracked(&self, def_id: DefId, sess: &Session) -> ExpnId {
 481         self.get_crate_data(def_id.krate).module_expansion(def_id.index, sess)
 482     }
 483
 484     /// Only public-facing way to traverse all the definitions in a non-local crate.
 485     /// Critically useful for this third-party project: <https://github.com/hacspec/hacspec>.
 486     /// See <https://github.com/rust-lang/rust/pull/85889> for context.
 487     pub fn num_def_ids_untracked(&self, cnum: CrateNum) -> usize {
 488         self.get_crate_data(cnum).num_def_ids()
 489     }
 490
 491     pub fn item_attrs_untracked<'a>(
 492         &'a self,
 493         def_id: DefId,
 494         sess: &'a Session,
 495     ) -> impl Iterator<Item = ast::Attribute> + 'a {
 496         self.get_crate_data(def_id.krate).get_item_attrs(def_id.index, sess)
 497     }
 498
 499     pub fn get_proc_macro_quoted_span_untracked(
 500         &self,
 501         cnum: CrateNum,
 502         id: usize,
 503         sess: &Session,
 504     ) -> Span {
 505         self.get_crate_data(cnum).get_proc_macro_quoted_span(id, sess)
 506     }
 507
 508     /// Decodes all traits in the crate (for rustdoc).
 509     pub fn traits_in_crate_untracked(&self, cnum: CrateNum) -> impl Iterator<Item = DefId> + '_ {
 510         self.get_crate_data(cnum).get_traits()
 511     }
 512
 513     /// Decodes all trait impls in the crate (for rustdoc).
 514     pub fn trait_impls_in_crate_untracked(
 515         &self,
 516         cnum: CrateNum,
 517     ) -> impl Iterator<Item = (DefId, DefId, Option<SimplifiedType>)> + '_ {
 518         self.get_crate_data(cnum).get_trait_impls()
 519     }
 520
 521     /// Decodes all inherent impls in the crate (for rustdoc).
 522     pub fn inherent_impls_in_crate_untracked(
 523         &self,
 524         cnum: CrateNum,
 525     ) -> impl Iterator<Item = (DefId, DefId)> + '_ {
 526         self.get_crate_data(cnum).get_inherent_impls()
 527     }
 528
 529     /// Decodes all incoherent inherent impls in the crate (for rustdoc).
 530     pub fn incoherent_impls_in_crate_untracked(
 531         &self,
 532         cnum: CrateNum,
 533     ) -> impl Iterator<Item = DefId> + '_ {
 534         self.get_crate_data(cnum).get_all_incoherent_impls()
 535     }
 536
 537     pub fn associated_item_def_ids_untracked<'a>(
 538         &'a self,
 539         def_id: DefId,
 540         sess: &'a Session,
 541     ) -> impl Iterator<Item = DefId> + 'a {
 542         self.get_crate_data(def_id.krate).get_associated_item_def_ids(def_id.index, sess)
 543     }
 544
 545     pub fn may_have_doc_links_untracked(&self, def_id: DefId) -> bool {
 546         self.get_crate_data(def_id.krate).get_may_have_doc_links(def_id.index)
 547     }
 548 }
 549
 550 impl CrateStore for CStore {
 551     fn as_any(&self) -> &dyn Any {
 552         self
 553     }
 554
 555     fn crate_name(&self, cnum: CrateNum) -> Symbol {
 556         self.get_crate_data(cnum).root.name
 557     }
 558
 559     fn stable_crate_id(&self, cnum: CrateNum) -> StableCrateId {
 560         self.get_crate_data(cnum).root.stable_crate_id
 561     }
 562
 563     fn stable_crate_id_to_crate_num(&self, stable_crate_id: StableCrateId) -> CrateNum {
 564         self.stable_crate_ids[&stable_crate_id]
 565     }
 566
 567     /// Returns the `DefKey` for a given `DefId`. This indicates the
 568     /// parent `DefId` as well as some idea of what kind of data the
 569     /// `DefId` refers to.
 570     fn def_key(&self, def: DefId) -> DefKey {
 571         self.get_crate_data(def.krate).def_key(def.index)
 572     }
 573
 574     fn def_path(&self, def: DefId) -> DefPath {
 575         self.get_crate_data(def.krate).def_path(def.index)
 576     }
 577
 578     fn def_path_hash(&self, def: DefId) -> DefPathHash {
 579         self.get_crate_data(def.krate).def_path_hash(def.index)
 580     }
 581
 582     fn def_path_hash_to_def_id(&self, cnum: CrateNum, hash: DefPathHash) -> DefId {
 583         let def_index = self.get_crate_data(cnum).def_path_hash_to_def_index(hash);
 584         DefId { krate: cnum, index: def_index }
 585     }
 586
 587     fn expn_hash_to_expn_id(
 588         &self,
 589         sess: &Session,
 590         cnum: CrateNum,
 591         index_guess: u32,
 592         hash: ExpnHash,
 593     ) -> ExpnId {
 594         self.get_crate_data(cnum).expn_hash_to_expn_id(sess, index_guess, hash)
 595     }
 596
 597     fn import_source_files(&self, sess: &Session, cnum: CrateNum) {
 598         self.get_crate_data(cnum).imported_source_files(sess);
 599     }
 600 }