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