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

   1 use crate::creader::{CStore, LoadedMacro};
   2 use crate::foreign_modules;
   3 use crate::native_libs;
   4 use crate::rmeta::{self, encoder};
   5
   6 use rustc_ast as ast;
   7 use rustc_ast::expand::allocator::AllocatorKind;
   8 use rustc_data_structures::stable_map::FxHashMap;
   9 use rustc_data_structures::svh::Svh;
  10 use rustc_hir as hir;
  11 use rustc_hir::def::DefKind;
  12 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, CRATE_DEF_INDEX, LOCAL_CRATE};
  13 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
  14 use rustc_middle::hir::exports::Export;
  15 use rustc_middle::middle::cstore::ForeignModule;
  16 use rustc_middle::middle::cstore::{CrateSource, CrateStore, EncodedMetadata};
  17 use rustc_middle::middle::exported_symbols::ExportedSymbol;
  18 use rustc_middle::middle::stability::DeprecationEntry;
  19 use rustc_middle::ty::query::Providers;
  20 use rustc_middle::ty::{self, TyCtxt};
  21 use rustc_session::utils::NativeLibKind;
  22 use rustc_session::{CrateDisambiguator, Session};
  23 use rustc_span::source_map::{Span, Spanned};
  24 use rustc_span::symbol::Symbol;
  25
  26 use rustc_data_structures::sync::Lrc;
  27 use rustc_span::ExpnId;
  28 use smallvec::SmallVec;
  29 use std::any::Any;
  30
  31 macro_rules! provide {
  32     (<$lt:tt> $tcx:ident, $def_id:ident, $other:ident, $cdata:ident,
  33       $($name:ident => $compute:block)*) => {
  34         pub fn provide_extern(providers: &mut Providers) {
  35             $(fn $name<$lt>(
  36                 $tcx: TyCtxt<$lt>,
  37                 def_id_arg: ty::query::query_keys::$name<$lt>,
  38             ) -> ty::query::query_values::$name<$lt> {
  39                 let _prof_timer =
  40                     $tcx.prof.generic_activity(concat!("metadata_decode_entry_", stringify!($name)));
  41
  42                 #[allow(unused_variables)]
  43                 let ($def_id, $other) = def_id_arg.into_args();
  44                 assert!(!$def_id.is_local());
  45
  46                 // External query providers call `crate_hash` in order to register a dependency
  47                 // on the crate metadata. The exception is `crate_hash` itself, which obviously
  48                 // doesn't need to do this (and can't, as it would cause a query cycle).
  49                 use rustc_middle::dep_graph::DepKind;
  50                 if DepKind::$name != DepKind::crate_hash && $tcx.dep_graph.is_fully_enabled() {
  51                     $tcx.ensure().crate_hash($def_id.krate);
  52                 }
  53
  54                 let $cdata = CStore::from_tcx($tcx).get_crate_data($def_id.krate);
  55
  56                 $compute
  57             })*
  58
  59             *providers = Providers {
  60                 $($name,)*
  61                 ..*providers
  62             };
  63         }
  64     }
  65 }
  66
  67 // small trait to work around different signature queries all being defined via
  68 // the macro above.
  69 trait IntoArgs {
  70     fn into_args(self) -> (DefId, DefId);
  71 }
  72
  73 impl IntoArgs for DefId {
  74     fn into_args(self) -> (DefId, DefId) {
  75         (self, self)
  76     }
  77 }
  78
  79 impl IntoArgs for CrateNum {
  80     fn into_args(self) -> (DefId, DefId) {
  81         (self.as_def_id(), self.as_def_id())
  82     }
  83 }
  84
  85 impl IntoArgs for (CrateNum, DefId) {
  86     fn into_args(self) -> (DefId, DefId) {
  87         (self.0.as_def_id(), self.1)
  88     }
  89 }
  90
  91 provide! { <'tcx> tcx, def_id, other, cdata,
  92     type_of => { cdata.get_type(def_id.index, tcx) }
  93     generics_of => { cdata.get_generics(def_id.index, tcx.sess) }
  94     explicit_predicates_of => { cdata.get_explicit_predicates(def_id.index, tcx) }
  95     inferred_outlives_of => { cdata.get_inferred_outlives(def_id.index, tcx) }
  96     super_predicates_of => { cdata.get_super_predicates(def_id.index, tcx) }
  97     explicit_item_bounds => { cdata.get_explicit_item_bounds(def_id.index, tcx) }
  98     trait_def => { cdata.get_trait_def(def_id.index, tcx.sess) }
  99     adt_def => { cdata.get_adt_def(def_id.index, tcx) }
 100     adt_destructor => {
 101         let _ = cdata;
 102         tcx.calculate_dtor(def_id, |_,_| Ok(()))
 103     }
 104     variances_of => { tcx.arena.alloc_from_iter(cdata.get_item_variances(def_id.index)) }
 105     associated_item_def_ids => {
 106         let mut result = SmallVec::<[_; 8]>::new();
 107         cdata.each_child_of_item(def_id.index,
 108           |child| result.push(child.res.def_id()), tcx.sess);
 109         tcx.arena.alloc_slice(&result)
 110     }
 111     associated_item => { cdata.get_associated_item(def_id.index, tcx.sess) }
 112     impl_trait_ref => { cdata.get_impl_trait(def_id.index, tcx) }
 113     impl_polarity => { cdata.get_impl_polarity(def_id.index) }
 114     coerce_unsized_info => {
 115         cdata.get_coerce_unsized_info(def_id.index).unwrap_or_else(|| {
 116             bug!("coerce_unsized_info: `{:?}` is missing its info", def_id);
 117         })
 118     }
 119     optimized_mir => { tcx.arena.alloc(cdata.get_optimized_mir(tcx, def_id.index)) }
 120     mir_for_ctfe => { tcx.arena.alloc(cdata.get_mir_for_ctfe(tcx, def_id.index)) }
 121     promoted_mir => { tcx.arena.alloc(cdata.get_promoted_mir(tcx, def_id.index)) }
 122     mir_abstract_const => { cdata.get_mir_abstract_const(tcx, def_id.index) }
 123     unused_generic_params => { cdata.get_unused_generic_params(def_id.index) }
 124     const_param_default => { tcx.mk_const(cdata.get_const_param_default(tcx, def_id.index)) }
 125     mir_const_qualif => { cdata.mir_const_qualif(def_id.index) }
 126     fn_sig => { cdata.fn_sig(def_id.index, tcx) }
 127     inherent_impls => { cdata.get_inherent_implementations_for_type(tcx, def_id.index) }
 128     is_const_fn_raw => { cdata.is_const_fn_raw(def_id.index) }
 129     asyncness => { cdata.asyncness(def_id.index) }
 130     is_foreign_item => { cdata.is_foreign_item(def_id.index) }
 131     static_mutability => { cdata.static_mutability(def_id.index) }
 132     generator_kind => { cdata.generator_kind(def_id.index) }
 133     opt_def_kind => { Some(cdata.def_kind(def_id.index)) }
 134     def_span => { cdata.get_span(def_id.index, &tcx.sess) }
 135     def_ident_span => {
 136         cdata.try_item_ident(def_id.index, &tcx.sess).ok().map(|ident| ident.span)
 137     }
 138     lookup_stability => {
 139         cdata.get_stability(def_id.index).map(|s| tcx.intern_stability(s))
 140     }
 141     lookup_const_stability => {
 142         cdata.get_const_stability(def_id.index).map(|s| tcx.intern_const_stability(s))
 143     }
 144     lookup_deprecation_entry => {
 145         cdata.get_deprecation(def_id.index).map(DeprecationEntry::external)
 146     }
 147     item_attrs => { tcx.arena.alloc_from_iter(
 148         cdata.get_item_attrs(def_id.index, tcx.sess)
 149     ) }
 150     fn_arg_names => { cdata.get_fn_param_names(tcx, def_id.index) }
 151     rendered_const => { cdata.get_rendered_const(def_id.index) }
 152     impl_parent => { cdata.get_parent_impl(def_id.index) }
 153     trait_of_item => { cdata.get_trait_of_item(def_id.index) }
 154     is_mir_available => { cdata.is_item_mir_available(def_id.index) }
 155     is_ctfe_mir_available => { cdata.is_ctfe_mir_available(def_id.index) }
 156
 157     dylib_dependency_formats => { cdata.get_dylib_dependency_formats(tcx) }
 158     is_panic_runtime => { cdata.root.panic_runtime }
 159     is_compiler_builtins => { cdata.root.compiler_builtins }
 160     has_global_allocator => { cdata.root.has_global_allocator }
 161     has_panic_handler => { cdata.root.has_panic_handler }
 162     is_profiler_runtime => { cdata.root.profiler_runtime }
 163     panic_strategy => { cdata.root.panic_strategy }
 164     extern_crate => {
 165         let r = *cdata.extern_crate.lock();
 166         r.map(|c| &*tcx.arena.alloc(c))
 167     }
 168     is_no_builtins => { cdata.root.no_builtins }
 169     symbol_mangling_version => { cdata.root.symbol_mangling_version }
 170     impl_defaultness => { cdata.get_impl_defaultness(def_id.index) }
 171     reachable_non_generics => {
 172         let reachable_non_generics = tcx
 173             .exported_symbols(cdata.cnum)
 174             .iter()
 175             .filter_map(|&(exported_symbol, export_level)| {
 176                 if let ExportedSymbol::NonGeneric(def_id) = exported_symbol {
 177                     Some((def_id, export_level))
 178                 } else {
 179                     None
 180                 }
 181             })
 182             .collect();
 183
 184         reachable_non_generics
 185     }
 186     native_libraries => { Lrc::new(cdata.get_native_libraries(tcx.sess)) }
 187     foreign_modules => { cdata.get_foreign_modules(tcx) }
 188     plugin_registrar_fn => {
 189         cdata.root.plugin_registrar_fn.map(|index| {
 190             DefId { krate: def_id.krate, index }
 191         })
 192     }
 193     proc_macro_decls_static => {
 194         cdata.root.proc_macro_data.as_ref().map(|data| {
 195             DefId {
 196                 krate: def_id.krate,
 197                 index: data.proc_macro_decls_static,
 198             }
 199         })
 200     }
 201     crate_disambiguator => { cdata.root.disambiguator }
 202     crate_hash => { cdata.root.hash }
 203     crate_host_hash => { cdata.host_hash }
 204     original_crate_name => { cdata.root.name }
 205
 206     extra_filename => { cdata.root.extra_filename.clone() }
 207
 208     implementations_of_trait => {
 209         cdata.get_implementations_for_trait(tcx, Some(other))
 210     }
 211
 212     all_trait_implementations => {
 213         cdata.get_implementations_for_trait(tcx, None)
 214     }
 215
 216     visibility => { cdata.get_visibility(def_id.index) }
 217     dep_kind => {
 218         let r = *cdata.dep_kind.lock();
 219         r
 220     }
 221     crate_name => { cdata.root.name }
 222     item_children => {
 223         let mut result = SmallVec::<[_; 8]>::new();
 224         cdata.each_child_of_item(def_id.index, |child| result.push(child), tcx.sess);
 225         tcx.arena.alloc_slice(&result)
 226     }
 227     defined_lib_features => { cdata.get_lib_features(tcx) }
 228     defined_lang_items => { cdata.get_lang_items(tcx) }
 229     diagnostic_items => { cdata.get_diagnostic_items() }
 230     missing_lang_items => { cdata.get_missing_lang_items(tcx) }
 231
 232     missing_extern_crate_item => {
 233         let r = matches!(*cdata.extern_crate.borrow(), Some(extern_crate) if !extern_crate.is_direct());
 234         r
 235     }
 236
 237     used_crate_source => { Lrc::new(cdata.source.clone()) }
 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 }
 252
 253 pub fn provide(providers: &mut Providers) {
 254     // FIXME(#44234) - almost all of these queries have no sub-queries and
 255     // therefore no actual inputs, they're just reading tables calculated in
 256     // resolve! Does this work? Unsure! That's what the issue is about
 257     *providers = Providers {
 258         is_dllimport_foreign_item: |tcx, id| match tcx.native_library_kind(id) {
 259             Some(NativeLibKind::Dylib | NativeLibKind::RawDylib | NativeLibKind::Unspecified) => {
 260                 true
 261             }
 262             _ => false,
 263         },
 264         is_statically_included_foreign_item: |tcx, id| {
 265             matches!(
 266                 tcx.native_library_kind(id),
 267                 Some(NativeLibKind::StaticBundle | NativeLibKind::StaticNoBundle)
 268             )
 269         },
 270         native_library_kind: |tcx, id| {
 271             tcx.native_libraries(id.krate)
 272                 .iter()
 273                 .filter(|lib| native_libs::relevant_lib(&tcx.sess, lib))
 274                 .find(|lib| {
 275                     let fm_id = match lib.foreign_module {
 276                         Some(id) => id,
 277                         None => return false,
 278                     };
 279                     let map = tcx.foreign_modules(id.krate);
 280                     map.get(&fm_id)
 281                         .expect("failed to find foreign module")
 282                         .foreign_items
 283                         .contains(&id)
 284                 })
 285                 .map(|l| l.kind)
 286         },
 287         native_libraries: |tcx, cnum| {
 288             assert_eq!(cnum, LOCAL_CRATE);
 289             Lrc::new(native_libs::collect(tcx))
 290         },
 291         foreign_modules: |tcx, cnum| {
 292             assert_eq!(cnum, LOCAL_CRATE);
 293             let modules: FxHashMap<DefId, ForeignModule> =
 294                 foreign_modules::collect(tcx).into_iter().map(|m| (m.def_id, m)).collect();
 295             Lrc::new(modules)
 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, cnum| {
 303             use std::collections::hash_map::Entry;
 304             use std::collections::vec_deque::VecDeque;
 305
 306             assert_eq!(cnum, LOCAL_CRATE);
 307             let mut visible_parent_map: DefIdMap<DefId> = Default::default();
 308
 309             // Issue 46112: We want the map to prefer the shortest
 310             // paths when reporting the path to an item. Therefore we
 311             // build up the map via a breadth-first search (BFS),
 312             // which naturally yields minimal-length paths.
 313             //
 314             // Note that it needs to be a BFS over the whole forest of
 315             // crates, not just each individual crate; otherwise you
 316             // only get paths that are locally minimal with respect to
 317             // whatever crate we happened to encounter first in this
 318             // traversal, but not globally minimal across all crates.
 319             let bfs_queue = &mut VecDeque::new();
 320
 321             // Preferring shortest paths alone does not guarantee a
 322             // deterministic result; so sort by crate num to avoid
 323             // hashtable iteration non-determinism. This only makes
 324             // things as deterministic as crate-nums assignment is,
 325             // which is to say, its not deterministic in general. But
 326             // we believe that libstd is consistently assigned crate
 327             // num 1, so it should be enough to resolve #46112.
 328             let mut crates: Vec<CrateNum> = (*tcx.crates()).to_owned();
 329             crates.sort();
 330
 331             for &cnum in crates.iter() {
 332                 // Ignore crates without a corresponding local `extern crate` item.
 333                 if tcx.missing_extern_crate_item(cnum) {
 334                     continue;
 335                 }
 336
 337                 bfs_queue.push_back(DefId { krate: cnum, index: CRATE_DEF_INDEX });
 338             }
 339
 340             // (restrict scope of mutable-borrow of `visible_parent_map`)
 341             {
 342                 let visible_parent_map = &mut visible_parent_map;
 343                 let mut add_child =
 344                     |bfs_queue: &mut VecDeque<_>, child: &Export<hir::HirId>, parent: DefId| {
 345                         if child.vis != ty::Visibility::Public {
 346                             return;
 347                         }
 348
 349                         if let Some(child) = child.res.opt_def_id() {
 350                             match visible_parent_map.entry(child) {
 351                                 Entry::Occupied(mut entry) => {
 352                                     // If `child` is defined in crate `cnum`, ensure
 353                                     // that it is mapped to a parent in `cnum`.
 354                                     if child.krate == cnum && entry.get().krate != cnum {
 355                                         entry.insert(parent);
 356                                     }
 357                                 }
 358                                 Entry::Vacant(entry) => {
 359                                     entry.insert(parent);
 360                                     bfs_queue.push_back(child);
 361                                 }
 362                             }
 363                         }
 364                     };
 365
 366                 while let Some(def) = bfs_queue.pop_front() {
 367                     for child in tcx.item_children(def).iter() {
 368                         add_child(bfs_queue, child, def);
 369                     }
 370                 }
 371             }
 372
 373             visible_parent_map
 374         },
 375
 376         dependency_formats: |tcx, cnum| {
 377             assert_eq!(cnum, LOCAL_CRATE);
 378             Lrc::new(crate::dependency_format::calculate(tcx))
 379         },
 380         has_global_allocator: |tcx, cnum| {
 381             assert_eq!(cnum, LOCAL_CRATE);
 382             CStore::from_tcx(tcx).has_global_allocator()
 383         },
 384         postorder_cnums: |tcx, cnum| {
 385             assert_eq!(cnum, LOCAL_CRATE);
 386             tcx.arena.alloc_slice(&CStore::from_tcx(tcx).crate_dependencies_in_postorder(cnum))
 387         },
 388
 389         ..*providers
 390     };
 391 }
 392
 393 impl CStore {
 394     pub fn struct_field_names_untracked(&self, def: DefId, sess: &Session) -> Vec<Spanned<Symbol>> {
 395         self.get_crate_data(def.krate).get_struct_field_names(def.index, sess)
 396     }
 397
 398     pub fn item_children_untracked(
 399         &self,
 400         def_id: DefId,
 401         sess: &Session,
 402     ) -> Vec<Export<hir::HirId>> {
 403         let mut result = vec![];
 404         self.get_crate_data(def_id.krate).each_child_of_item(
 405             def_id.index,
 406             |child| result.push(child),
 407             sess,
 408         );
 409         result
 410     }
 411
 412     pub fn load_macro_untracked(&self, id: DefId, sess: &Session) -> LoadedMacro {
 413         let _prof_timer = sess.prof.generic_activity("metadata_load_macro");
 414
 415         let data = self.get_crate_data(id.krate);
 416         if data.root.is_proc_macro_crate() {
 417             return LoadedMacro::ProcMacro(data.load_proc_macro(id.index, sess));
 418         }
 419
 420         let span = data.get_span(id.index, sess);
 421
 422         let attrs = data.get_item_attrs(id.index, sess).collect();
 423
 424         let ident = data.item_ident(id.index, sess);
 425
 426         LoadedMacro::MacroDef(
 427             ast::Item {
 428                 ident,
 429                 id: ast::DUMMY_NODE_ID,
 430                 span,
 431                 attrs,
 432                 kind: ast::ItemKind::MacroDef(data.get_macro(id.index, sess)),
 433                 vis: ast::Visibility {
 434                     span: span.shrink_to_lo(),
 435                     kind: ast::VisibilityKind::Inherited,
 436                     tokens: None,
 437                 },
 438                 tokens: None,
 439             },
 440             data.root.edition,
 441         )
 442     }
 443
 444     pub fn associated_item_cloned_untracked(&self, def: DefId, sess: &Session) -> ty::AssocItem {
 445         self.get_crate_data(def.krate).get_associated_item(def.index, sess)
 446     }
 447
 448     pub fn crate_source_untracked(&self, cnum: CrateNum) -> CrateSource {
 449         self.get_crate_data(cnum).source.clone()
 450     }
 451
 452     pub fn get_span_untracked(&self, def_id: DefId, sess: &Session) -> Span {
 453         self.get_crate_data(def_id.krate).get_span(def_id.index, sess)
 454     }
 455
 456     pub fn item_generics_num_lifetimes(&self, def_id: DefId, sess: &Session) -> usize {
 457         self.get_crate_data(def_id.krate).get_generics(def_id.index, sess).own_counts().lifetimes
 458     }
 459
 460     pub fn module_expansion_untracked(&self, def_id: DefId, sess: &Session) -> ExpnId {
 461         self.get_crate_data(def_id.krate).module_expansion(def_id.index, sess)
 462     }
 463
 464     pub fn num_def_ids(&self, cnum: CrateNum) -> usize {
 465         self.get_crate_data(cnum).num_def_ids()
 466     }
 467
 468     pub fn item_attrs(&self, def_id: DefId, sess: &Session) -> Vec<ast::Attribute> {
 469         self.get_crate_data(def_id.krate).get_item_attrs(def_id.index, sess).collect()
 470     }
 471 }
 472
 473 impl CrateStore for CStore {
 474     fn as_any(&self) -> &dyn Any {
 475         self
 476     }
 477
 478     fn crate_name_untracked(&self, cnum: CrateNum) -> Symbol {
 479         self.get_crate_data(cnum).root.name
 480     }
 481
 482     fn crate_is_private_dep_untracked(&self, cnum: CrateNum) -> bool {
 483         self.get_crate_data(cnum).private_dep
 484     }
 485
 486     fn crate_disambiguator_untracked(&self, cnum: CrateNum) -> CrateDisambiguator {
 487         self.get_crate_data(cnum).root.disambiguator
 488     }
 489
 490     fn crate_hash_untracked(&self, cnum: CrateNum) -> Svh {
 491         self.get_crate_data(cnum).root.hash
 492     }
 493
 494     /// Returns the `DefKey` for a given `DefId`. This indicates the
 495     /// parent `DefId` as well as some idea of what kind of data the
 496     /// `DefId` refers to.
 497     fn def_key(&self, def: DefId) -> DefKey {
 498         self.get_crate_data(def.krate).def_key(def.index)
 499     }
 500
 501     fn def_kind(&self, def: DefId) -> DefKind {
 502         self.get_crate_data(def.krate).def_kind(def.index)
 503     }
 504
 505     fn def_path(&self, def: DefId) -> DefPath {
 506         self.get_crate_data(def.krate).def_path(def.index)
 507     }
 508
 509     fn def_path_hash(&self, def: DefId) -> DefPathHash {
 510         self.get_crate_data(def.krate).def_path_hash(def.index)
 511     }
 512
 513     // See `CrateMetadataRef::def_path_hash_to_def_id` for more details
 514     fn def_path_hash_to_def_id(
 515         &self,
 516         cnum: CrateNum,
 517         index_guess: u32,
 518         hash: DefPathHash,
 519     ) -> Option<DefId> {
 520         self.get_crate_data(cnum).def_path_hash_to_def_id(cnum, index_guess, hash)
 521     }
 522
 523     fn crates_untracked(&self) -> Vec<CrateNum> {
 524         let mut result = vec![];
 525         self.iter_crate_data(|cnum, _| result.push(cnum));
 526         result
 527     }
 528
 529     fn encode_metadata(&self, tcx: TyCtxt<'_>) -> EncodedMetadata {
 530         encoder::encode_metadata(tcx)
 531     }
 532
 533     fn metadata_encoding_version(&self) -> &[u8] {
 534         rmeta::METADATA_HEADER
 535     }
 536
 537     fn allocator_kind(&self) -> Option<AllocatorKind> {
 538         self.allocator_kind()
 539     }
 540 }