1 // Decoding metadata from a single crate's metadata
3 use crate::rmeta::table::{FixedSizeEncoding, Table};
6 use rustc::dep_graph::{self, DepNodeIndex};
7 use rustc::hir::exports::Export;
8 use rustc::hir::map::definitions::DefPathTable;
9 use rustc::hir::map::{DefKey, DefPath, DefPathData, DefPathHash};
10 use rustc::middle::cstore::{CrateSource, ExternCrate};
11 use rustc::middle::cstore::{ForeignModule, LinkagePreference, NativeLibrary};
12 use rustc::middle::exported_symbols::{ExportedSymbol, SymbolExportLevel};
13 use rustc::middle::lang_items;
14 use rustc::mir::interpret::{AllocDecodingSession, AllocDecodingState};
15 use rustc::mir::{self, interpret, BodyAndCache, Promoted};
16 use rustc::session::Session;
17 use rustc::ty::codec::TyDecoder;
18 use rustc::ty::{self, Ty, TyCtxt};
19 use rustc::util::common::record_time;
20 use rustc_data_structures::captures::Captures;
21 use rustc_data_structures::fingerprint::Fingerprint;
22 use rustc_data_structures::fx::FxHashMap;
23 use rustc_data_structures::svh::Svh;
24 use rustc_data_structures::sync::{AtomicCell, Lock, LockGuard, Lrc, Once};
26 use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
27 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, LocalDefId, CRATE_DEF_INDEX, LOCAL_CRATE};
28 use rustc_index::vec::{Idx, IndexVec};
32 use std::num::NonZeroUsize;
36 use proc_macro::bridge::client::ProcMacro;
37 use rustc_expand::base::{SyntaxExtension, SyntaxExtensionKind};
38 use rustc_expand::proc_macro::{AttrProcMacro, BangProcMacro, ProcMacroDerive};
39 use rustc_serialize::{opaque, Decodable, Decoder, SpecializedDecoder};
40 use rustc_span::source_map::{self, respan, Spanned};
41 use rustc_span::symbol::{sym, Symbol};
42 use rustc_span::{self, hygiene::MacroKind, BytePos, Pos, Span, DUMMY_SP};
43 use syntax::ast::{self, Ident};
46 pub use cstore_impl::{provide, provide_extern};
50 crate struct MetadataBlob(MetadataRef);
52 // A map from external crate numbers (as decoded from some crate file) to
53 // local crate numbers (as generated during this session). Each external
54 // crate may refer to types in other external crates, and each has their
56 crate type CrateNumMap = IndexVec<CrateNum, CrateNum>;
58 crate struct CrateMetadata {
59 /// The primary crate data - binary metadata blob.
62 // --- Some data pre-decoded from the metadata blob, usually for performance ---
63 /// Properties of the whole crate.
64 /// NOTE(eddyb) we pass `'static` to a `'tcx` parameter because this
65 /// lifetime is only used behind `Lazy`, and therefore acts like an
66 /// universal (`for<'tcx>`), that is paired up with whichever `TyCtxt`
67 /// is being used to decode those values.
68 root: CrateRoot<'static>,
69 /// For each definition in this crate, we encode a key. When the
70 /// crate is loaded, we read all the keys and put them in this
71 /// hashmap, which gives the reverse mapping. This allows us to
72 /// quickly retrace a `DefPath`, which is needed for incremental
73 /// compilation support.
74 def_path_table: DefPathTable,
76 /// FIXME: Used only from queries and can use query cache,
77 /// so pre-decoding can probably be avoided.
78 trait_impls: FxHashMap<(u32, DefIndex), Lazy<[DefIndex]>>,
79 /// Proc macro descriptions for this crate, if it's a proc macro crate.
80 raw_proc_macros: Option<&'static [ProcMacro]>,
81 /// Source maps for code from the crate.
82 source_map_import_info: Once<Vec<ImportedSourceFile>>,
83 /// Used for decoding interpret::AllocIds in a cached & thread-safe manner.
84 alloc_decoding_state: AllocDecodingState,
85 /// The `DepNodeIndex` of the `DepNode` representing this upstream crate.
86 /// It is initialized on the first access in `get_crate_dep_node_index()`.
87 /// Do not access the value directly, as it might not have been initialized yet.
88 /// The field must always be initialized to `DepNodeIndex::INVALID`.
89 dep_node_index: AtomicCell<DepNodeIndex>,
91 // --- Other significant crate properties ---
92 /// ID of this crate, from the current compilation session's point of view.
94 /// Maps crate IDs as they are were seen from this crate's compilation sessions into
95 /// IDs as they are seen from the current compilation session.
96 cnum_map: CrateNumMap,
97 /// Same ID set as `cnum_map` plus maybe some injected crates like panic runtime.
98 dependencies: Lock<Vec<CrateNum>>,
99 /// How to link (or not link) this crate to the currently compiled crate.
100 dep_kind: Lock<DepKind>,
101 /// Filesystem location of this crate.
103 /// Whether or not this crate should be consider a private dependency
104 /// for purposes of the 'exported_private_dependencies' lint
106 /// The hash for the host proc macro. Used to support `-Z dual-proc-macro`.
107 host_hash: Option<Svh>,
109 // --- Data used only for improving diagnostics ---
110 /// Information about the `extern crate` item or path that caused this crate to be loaded.
111 /// If this is `None`, then the crate was injected (e.g., by the allocator).
112 extern_crate: Lock<Option<ExternCrate>>,
115 /// Holds information about a rustc_span::SourceFile imported from another crate.
116 /// See `imported_source_files()` for more information.
117 struct ImportedSourceFile {
118 /// This SourceFile's byte-offset within the source_map of its original crate
119 original_start_pos: rustc_span::BytePos,
120 /// The end of this SourceFile within the source_map of its original crate
121 original_end_pos: rustc_span::BytePos,
122 /// The imported SourceFile's representation within the local source_map
123 translated_source_file: Lrc<rustc_span::SourceFile>,
126 pub(super) struct DecodeContext<'a, 'tcx> {
127 opaque: opaque::Decoder<'a>,
128 cdata: Option<&'a CrateMetadata>,
129 sess: Option<&'tcx Session>,
130 tcx: Option<TyCtxt<'tcx>>,
132 // Cache the last used source_file for translating spans as an optimization.
133 last_source_file_index: usize,
135 lazy_state: LazyState,
137 // Used for decoding interpret::AllocIds in a cached & thread-safe manner.
138 alloc_decoding_session: Option<AllocDecodingSession<'a>>,
141 /// Abstract over the various ways one can create metadata decoders.
142 pub(super) trait Metadata<'a, 'tcx>: Copy {
143 fn raw_bytes(self) -> &'a [u8];
144 fn cdata(self) -> Option<&'a CrateMetadata> {
147 fn sess(self) -> Option<&'tcx Session> {
150 fn tcx(self) -> Option<TyCtxt<'tcx>> {
154 fn decoder(self, pos: usize) -> DecodeContext<'a, 'tcx> {
155 let tcx = self.tcx();
157 opaque: opaque::Decoder::new(self.raw_bytes(), pos),
159 sess: self.sess().or(tcx.map(|tcx| tcx.sess)),
161 last_source_file_index: 0,
162 lazy_state: LazyState::NoNode,
163 alloc_decoding_session: self
165 .map(|cdata| cdata.alloc_decoding_state.new_decoding_session()),
170 impl<'a, 'tcx> Metadata<'a, 'tcx> for &'a MetadataBlob {
171 fn raw_bytes(self) -> &'a [u8] {
176 impl<'a, 'tcx> Metadata<'a, 'tcx> for (&'a MetadataBlob, &'tcx Session) {
177 fn raw_bytes(self) -> &'a [u8] {
178 let (blob, _) = self;
182 fn sess(self) -> Option<&'tcx Session> {
183 let (_, sess) = self;
188 impl<'a, 'tcx> Metadata<'a, 'tcx> for &'a CrateMetadata {
189 fn raw_bytes(self) -> &'a [u8] {
190 self.blob.raw_bytes()
192 fn cdata(self) -> Option<&'a CrateMetadata> {
197 impl<'a, 'tcx> Metadata<'a, 'tcx> for (&'a CrateMetadata, &'tcx Session) {
198 fn raw_bytes(self) -> &'a [u8] {
201 fn cdata(self) -> Option<&'a CrateMetadata> {
204 fn sess(self) -> Option<&'tcx Session> {
209 impl<'a, 'tcx> Metadata<'a, 'tcx> for (&'a CrateMetadata, TyCtxt<'tcx>) {
210 fn raw_bytes(self) -> &'a [u8] {
213 fn cdata(self) -> Option<&'a CrateMetadata> {
216 fn tcx(self) -> Option<TyCtxt<'tcx>> {
221 impl<'a, 'tcx, T: Decodable> Lazy<T> {
222 fn decode<M: Metadata<'a, 'tcx>>(self, metadata: M) -> T {
223 let mut dcx = metadata.decoder(self.position.get());
224 dcx.lazy_state = LazyState::NodeStart(self.position);
225 T::decode(&mut dcx).unwrap()
229 impl<'a: 'x, 'tcx: 'x, 'x, T: Decodable> Lazy<[T]> {
230 fn decode<M: Metadata<'a, 'tcx>>(
233 ) -> impl ExactSizeIterator<Item = T> + Captures<'a> + Captures<'tcx> + 'x {
234 let mut dcx = metadata.decoder(self.position.get());
235 dcx.lazy_state = LazyState::NodeStart(self.position);
236 (0..self.meta).map(move |_| T::decode(&mut dcx).unwrap())
240 impl<'a, 'tcx> DecodeContext<'a, 'tcx> {
241 fn tcx(&self) -> TyCtxt<'tcx> {
242 self.tcx.expect("missing TyCtxt in DecodeContext")
245 fn cdata(&self) -> &'a CrateMetadata {
246 self.cdata.expect("missing CrateMetadata in DecodeContext")
249 fn read_lazy_with_meta<T: ?Sized + LazyMeta>(
252 ) -> Result<Lazy<T>, <Self as Decoder>::Error> {
253 let min_size = T::min_size(meta);
254 let distance = self.read_usize()?;
255 let position = match self.lazy_state {
256 LazyState::NoNode => bug!("read_lazy_with_meta: outside of a metadata node"),
257 LazyState::NodeStart(start) => {
258 let start = start.get();
259 assert!(distance + min_size <= start);
260 start - distance - min_size
262 LazyState::Previous(last_min_end) => last_min_end.get() + distance,
264 self.lazy_state = LazyState::Previous(NonZeroUsize::new(position + min_size).unwrap());
265 Ok(Lazy::from_position_and_meta(NonZeroUsize::new(position).unwrap(), meta))
269 impl<'a, 'tcx> TyDecoder<'tcx> for DecodeContext<'a, 'tcx> {
271 fn tcx(&self) -> TyCtxt<'tcx> {
272 self.tcx.expect("missing TyCtxt in DecodeContext")
276 fn peek_byte(&self) -> u8 {
277 self.opaque.data[self.opaque.position()]
281 fn position(&self) -> usize {
282 self.opaque.position()
285 fn cached_ty_for_shorthand<F>(
289 ) -> Result<Ty<'tcx>, Self::Error>
291 F: FnOnce(&mut Self) -> Result<Ty<'tcx>, Self::Error>,
293 let tcx = self.tcx();
295 let key = ty::CReaderCacheKey { cnum: self.cdata().cnum, pos: shorthand };
297 if let Some(&ty) = tcx.rcache.borrow().get(&key) {
301 let ty = or_insert_with(self)?;
302 tcx.rcache.borrow_mut().insert(key, ty);
306 fn with_position<F, R>(&mut self, pos: usize, f: F) -> R
308 F: FnOnce(&mut Self) -> R,
310 let new_opaque = opaque::Decoder::new(self.opaque.data, pos);
311 let old_opaque = mem::replace(&mut self.opaque, new_opaque);
312 let old_state = mem::replace(&mut self.lazy_state, LazyState::NoNode);
314 self.opaque = old_opaque;
315 self.lazy_state = old_state;
319 fn map_encoded_cnum_to_current(&self, cnum: CrateNum) -> CrateNum {
320 if cnum == LOCAL_CRATE { self.cdata().cnum } else { self.cdata().cnum_map[cnum] }
324 impl<'a, 'tcx, T> SpecializedDecoder<Lazy<T>> for DecodeContext<'a, 'tcx> {
325 fn specialized_decode(&mut self) -> Result<Lazy<T>, Self::Error> {
326 self.read_lazy_with_meta(())
330 impl<'a, 'tcx, T> SpecializedDecoder<Lazy<[T]>> for DecodeContext<'a, 'tcx> {
331 fn specialized_decode(&mut self) -> Result<Lazy<[T]>, Self::Error> {
332 let len = self.read_usize()?;
333 if len == 0 { Ok(Lazy::empty()) } else { self.read_lazy_with_meta(len) }
337 impl<'a, 'tcx, I: Idx, T> SpecializedDecoder<Lazy<Table<I, T>>> for DecodeContext<'a, 'tcx>
339 Option<T>: FixedSizeEncoding,
341 fn specialized_decode(&mut self) -> Result<Lazy<Table<I, T>>, Self::Error> {
342 let len = self.read_usize()?;
343 self.read_lazy_with_meta(len)
347 impl<'a, 'tcx> SpecializedDecoder<DefId> for DecodeContext<'a, 'tcx> {
349 fn specialized_decode(&mut self) -> Result<DefId, Self::Error> {
350 let krate = CrateNum::decode(self)?;
351 let index = DefIndex::decode(self)?;
353 Ok(DefId { krate, index })
357 impl<'a, 'tcx> SpecializedDecoder<DefIndex> for DecodeContext<'a, 'tcx> {
359 fn specialized_decode(&mut self) -> Result<DefIndex, Self::Error> {
360 Ok(DefIndex::from_u32(self.read_u32()?))
364 impl<'a, 'tcx> SpecializedDecoder<LocalDefId> for DecodeContext<'a, 'tcx> {
366 fn specialized_decode(&mut self) -> Result<LocalDefId, Self::Error> {
367 self.specialized_decode().map(|i| LocalDefId::from_def_id(i))
371 impl<'a, 'tcx> SpecializedDecoder<interpret::AllocId> for DecodeContext<'a, 'tcx> {
372 fn specialized_decode(&mut self) -> Result<interpret::AllocId, Self::Error> {
373 if let Some(alloc_decoding_session) = self.alloc_decoding_session {
374 alloc_decoding_session.decode_alloc_id(self)
376 bug!("Attempting to decode interpret::AllocId without CrateMetadata")
381 impl<'a, 'tcx> SpecializedDecoder<Span> for DecodeContext<'a, 'tcx> {
382 fn specialized_decode(&mut self) -> Result<Span, Self::Error> {
383 let tag = u8::decode(self)?;
385 if tag == TAG_INVALID_SPAN {
389 debug_assert_eq!(tag, TAG_VALID_SPAN);
391 let lo = BytePos::decode(self)?;
392 let len = BytePos::decode(self)?;
395 let sess = if let Some(sess) = self.sess {
398 bug!("Cannot decode Span without Session.")
401 let imported_source_files = self.cdata().imported_source_files(&sess.source_map());
403 // Optimize for the case that most spans within a translated item
404 // originate from the same source_file.
405 let last_source_file = &imported_source_files[self.last_source_file_index];
407 if lo >= last_source_file.original_start_pos && lo <= last_source_file.original_end_pos
412 let mut b = imported_source_files.len();
416 if imported_source_files[m].original_start_pos > lo {
423 self.last_source_file_index = a;
424 &imported_source_files[a]
428 // Make sure our binary search above is correct.
429 debug_assert!(lo >= source_file.original_start_pos && lo <= source_file.original_end_pos);
431 // Make sure we correctly filtered out invalid spans during encoding
432 debug_assert!(hi >= source_file.original_start_pos && hi <= source_file.original_end_pos);
435 (lo + source_file.translated_source_file.start_pos) - source_file.original_start_pos;
437 (hi + source_file.translated_source_file.start_pos) - source_file.original_start_pos;
439 Ok(Span::with_root_ctxt(lo, hi))
443 impl SpecializedDecoder<Ident> for DecodeContext<'_, '_> {
444 fn specialized_decode(&mut self) -> Result<Ident, Self::Error> {
445 // FIXME(jseyfried): intercrate hygiene
447 Ok(Ident::with_dummy_span(Symbol::decode(self)?))
451 impl<'a, 'tcx> SpecializedDecoder<Fingerprint> for DecodeContext<'a, 'tcx> {
452 fn specialized_decode(&mut self) -> Result<Fingerprint, Self::Error> {
453 Fingerprint::decode_opaque(&mut self.opaque)
457 impl<'a, 'tcx, T: Decodable> SpecializedDecoder<mir::ClearCrossCrate<T>>
458 for DecodeContext<'a, 'tcx>
461 fn specialized_decode(&mut self) -> Result<mir::ClearCrossCrate<T>, Self::Error> {
462 Ok(mir::ClearCrossCrate::Clear)
466 implement_ty_decoder!(DecodeContext<'a, 'tcx>);
469 crate fn new(metadata_ref: MetadataRef) -> MetadataBlob {
470 MetadataBlob(metadata_ref)
473 crate fn is_compatible(&self) -> bool {
474 self.raw_bytes().starts_with(METADATA_HEADER)
477 crate fn get_rustc_version(&self) -> String {
478 Lazy::<String>::from_position(NonZeroUsize::new(METADATA_HEADER.len() + 4).unwrap())
482 crate fn get_root(&self) -> CrateRoot<'tcx> {
483 let slice = self.raw_bytes();
484 let offset = METADATA_HEADER.len();
485 let pos = (((slice[offset + 0] as u32) << 24)
486 | ((slice[offset + 1] as u32) << 16)
487 | ((slice[offset + 2] as u32) << 8)
488 | ((slice[offset + 3] as u32) << 0)) as usize;
489 Lazy::<CrateRoot<'tcx>>::from_position(NonZeroUsize::new(pos).unwrap()).decode(self)
492 crate fn list_crate_metadata(&self, out: &mut dyn io::Write) -> io::Result<()> {
493 write!(out, "=External Dependencies=\n")?;
494 let root = self.get_root();
495 for (i, dep) in root.crate_deps.decode(self).enumerate() {
496 write!(out, "{} {}{}\n", i + 1, dep.name, dep.extra_filename)?;
503 impl<'tcx> EntryKind<'tcx> {
504 fn def_kind(&self) -> Option<DefKind> {
506 EntryKind::Const(..) => DefKind::Const,
507 EntryKind::AssocConst(..) => DefKind::AssocConst,
509 | EntryKind::MutStatic
510 | EntryKind::ForeignImmStatic
511 | EntryKind::ForeignMutStatic => DefKind::Static,
512 EntryKind::Struct(_, _) => DefKind::Struct,
513 EntryKind::Union(_, _) => DefKind::Union,
514 EntryKind::Fn(_) | EntryKind::ForeignFn(_) => DefKind::Fn,
515 EntryKind::Method(_) => DefKind::Method,
516 EntryKind::Type => DefKind::TyAlias,
517 EntryKind::TypeParam => DefKind::TyParam,
518 EntryKind::ConstParam => DefKind::ConstParam,
519 EntryKind::OpaqueTy => DefKind::OpaqueTy,
520 EntryKind::AssocType(_) => DefKind::AssocTy,
521 EntryKind::AssocOpaqueTy(_) => DefKind::AssocOpaqueTy,
522 EntryKind::Mod(_) => DefKind::Mod,
523 EntryKind::Variant(_) => DefKind::Variant,
524 EntryKind::Trait(_) => DefKind::Trait,
525 EntryKind::TraitAlias => DefKind::TraitAlias,
526 EntryKind::Enum(..) => DefKind::Enum,
527 EntryKind::MacroDef(_) => DefKind::Macro(MacroKind::Bang),
528 EntryKind::ForeignType => DefKind::ForeignTy,
530 EntryKind::ForeignMod
531 | EntryKind::GlobalAsm
534 | EntryKind::Generator(_)
535 | EntryKind::Closure => return None,
541 crate fn is_proc_macro_crate(&self) -> bool {
542 self.proc_macro_data.is_some()
545 crate fn name(&self) -> Symbol {
549 crate fn disambiguator(&self) -> CrateDisambiguator {
553 crate fn hash(&self) -> Svh {
557 crate fn triple(&self) -> &TargetTriple {
561 crate fn decode_crate_deps(
563 metadata: &'a MetadataBlob,
564 ) -> impl ExactSizeIterator<Item = CrateDep> + Captures<'a> {
565 self.crate_deps.decode(metadata)
569 impl<'a, 'tcx> CrateMetadata {
573 root: CrateRoot<'static>,
574 raw_proc_macros: Option<&'static [ProcMacro]>,
576 cnum_map: CrateNumMap,
580 host_hash: Option<Svh>,
582 let def_path_table = record_time(&sess.perf_stats.decode_def_path_tables_time, || {
583 root.def_path_table.decode((&blob, sess))
585 let trait_impls = root
587 .decode((&blob, sess))
588 .map(|trait_impls| (trait_impls.trait_id, trait_impls.impls))
590 let alloc_decoding_state =
591 AllocDecodingState::new(root.interpret_alloc_index.decode(&blob).collect());
592 let dependencies = Lock::new(cnum_map.iter().cloned().collect());
599 source_map_import_info: Once::new(),
600 alloc_decoding_state,
601 dep_node_index: AtomicCell::new(DepNodeIndex::INVALID),
605 dep_kind: Lock::new(dep_kind),
609 extern_crate: Lock::new(None),
613 fn is_proc_macro(&self, id: DefIndex) -> bool {
614 self.root.proc_macro_data.and_then(|data| data.decode(self).find(|x| *x == id)).is_some()
617 fn maybe_kind(&self, item_id: DefIndex) -> Option<EntryKind<'tcx>> {
618 self.root.per_def.kind.get(self, item_id).map(|k| k.decode(self))
621 fn kind(&self, item_id: DefIndex) -> EntryKind<'tcx> {
622 assert!(!self.is_proc_macro(item_id));
623 self.maybe_kind(item_id).unwrap_or_else(|| {
625 "CrateMetadata::kind({:?}): id not found, in crate {:?} with number {}",
633 fn local_def_id(&self, index: DefIndex) -> DefId {
634 DefId { krate: self.cnum, index }
637 fn raw_proc_macro(&self, id: DefIndex) -> &ProcMacro {
638 // DefIndex's in root.proc_macro_data have a one-to-one correspondence
639 // with items in 'raw_proc_macros'.
640 // NOTE: If you update the order of macros in 'proc_macro_data' for any reason,
641 // you must also update src/librustc_builtin_macros/proc_macro_harness.rs
642 // Failing to do so will result in incorrect data being associated
643 // with proc macros when deserialized.
644 let pos = self.root.proc_macro_data.unwrap().decode(self).position(|i| i == id).unwrap();
645 &self.raw_proc_macros.unwrap()[pos]
648 fn item_name(&self, item_index: DefIndex) -> Symbol {
649 if !self.is_proc_macro(item_index) {
650 self.def_key(item_index)
654 .expect("no name in item_name")
656 Symbol::intern(self.raw_proc_macro(item_index).name())
660 fn def_kind(&self, index: DefIndex) -> Option<DefKind> {
661 if !self.is_proc_macro(index) {
662 self.kind(index).def_kind()
664 Some(DefKind::Macro(macro_kind(self.raw_proc_macro(index))))
668 fn get_span(&self, index: DefIndex, sess: &Session) -> Span {
669 self.root.per_def.span.get(self, index).unwrap().decode((self, sess))
672 fn load_proc_macro(&self, id: DefIndex, sess: &Session) -> SyntaxExtension {
673 let (name, kind, helper_attrs) = match *self.raw_proc_macro(id) {
674 ProcMacro::CustomDerive { trait_name, attributes, client } => {
676 attributes.iter().cloned().map(Symbol::intern).collect::<Vec<_>>();
679 SyntaxExtensionKind::Derive(Box::new(ProcMacroDerive { client })),
683 ProcMacro::Attr { name, client } => {
684 (name, SyntaxExtensionKind::Attr(Box::new(AttrProcMacro { client })), Vec::new())
686 ProcMacro::Bang { name, client } => {
687 (name, SyntaxExtensionKind::Bang(Box::new(BangProcMacro { client })), Vec::new())
691 SyntaxExtension::new(
694 self.get_span(id, sess),
697 Symbol::intern(name),
698 &self.get_item_attrs(id, sess),
702 fn get_trait_def(&self, item_id: DefIndex, sess: &Session) -> ty::TraitDef {
703 match self.kind(item_id) {
704 EntryKind::Trait(data) => {
705 let data = data.decode((self, sess));
707 self.local_def_id(item_id),
712 self.def_path_table.def_path_hash(item_id),
715 EntryKind::TraitAlias => ty::TraitDef::new(
716 self.local_def_id(item_id),
717 hir::Unsafety::Normal,
721 self.def_path_table.def_path_hash(item_id),
723 _ => bug!("def-index does not refer to trait or trait alias"),
730 kind: &EntryKind<'_>,
733 ) -> ty::VariantDef {
734 let data = match kind {
735 EntryKind::Variant(data) | EntryKind::Struct(data, _) | EntryKind::Union(data, _) => {
741 let adt_kind = match kind {
742 EntryKind::Variant(_) => ty::AdtKind::Enum,
743 EntryKind::Struct(..) => ty::AdtKind::Struct,
744 EntryKind::Union(..) => ty::AdtKind::Union,
749 if adt_kind == ty::AdtKind::Enum { Some(self.local_def_id(index)) } else { None };
750 let ctor_did = data.ctor.map(|index| self.local_def_id(index));
754 Ident::with_dummy_span(self.item_name(index)),
762 .unwrap_or(Lazy::empty())
764 .map(|index| ty::FieldDef {
765 did: self.local_def_id(index),
766 ident: Ident::with_dummy_span(self.item_name(index)),
767 vis: self.get_visibility(index),
777 fn get_adt_def(&self, item_id: DefIndex, tcx: TyCtxt<'tcx>) -> &'tcx ty::AdtDef {
778 let kind = self.kind(item_id);
779 let did = self.local_def_id(item_id);
781 let (adt_kind, repr) = match kind {
782 EntryKind::Enum(repr) => (ty::AdtKind::Enum, repr),
783 EntryKind::Struct(_, repr) => (ty::AdtKind::Struct, repr),
784 EntryKind::Union(_, repr) => (ty::AdtKind::Union, repr),
785 _ => bug!("get_adt_def called on a non-ADT {:?}", did),
788 let variants = if let ty::AdtKind::Enum = adt_kind {
793 .unwrap_or(Lazy::empty())
795 .map(|index| self.get_variant(tcx, &self.kind(index), index, did))
798 std::iter::once(self.get_variant(tcx, &kind, item_id, did)).collect()
801 tcx.alloc_adt_def(did, adt_kind, variants, repr)
804 fn get_explicit_predicates(
808 ) -> ty::GenericPredicates<'tcx> {
809 self.root.per_def.explicit_predicates.get(self, item_id).unwrap().decode((self, tcx))
812 fn get_inferred_outlives(
816 ) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
821 .map(|predicates| predicates.decode((self, tcx)))
825 fn get_super_predicates(
829 ) -> ty::GenericPredicates<'tcx> {
830 self.root.per_def.super_predicates.get(self, item_id).unwrap().decode((self, tcx))
833 fn get_generics(&self, item_id: DefIndex, sess: &Session) -> ty::Generics {
834 self.root.per_def.generics.get(self, item_id).unwrap().decode((self, sess))
837 fn get_type(&self, id: DefIndex, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
838 self.root.per_def.ty.get(self, id).unwrap().decode((self, tcx))
841 fn get_stability(&self, id: DefIndex) -> Option<attr::Stability> {
842 match self.is_proc_macro(id) {
843 true => self.root.proc_macro_stability,
844 false => self.root.per_def.stability.get(self, id).map(|stab| stab.decode(self)),
848 fn get_const_stability(&self, id: DefIndex) -> Option<attr::ConstStability> {
849 self.root.per_def.const_stability.get(self, id).map(|stab| stab.decode(self))
852 fn get_deprecation(&self, id: DefIndex) -> Option<attr::Deprecation> {
857 .filter(|_| !self.is_proc_macro(id))
858 .map(|depr| depr.decode(self))
861 fn get_visibility(&self, id: DefIndex) -> ty::Visibility {
862 match self.is_proc_macro(id) {
863 true => ty::Visibility::Public,
864 false => self.root.per_def.visibility.get(self, id).unwrap().decode(self),
868 fn get_impl_data(&self, id: DefIndex) -> ImplData {
869 match self.kind(id) {
870 EntryKind::Impl(data) => data.decode(self),
875 fn get_parent_impl(&self, id: DefIndex) -> Option<DefId> {
876 self.get_impl_data(id).parent_impl
879 fn get_impl_polarity(&self, id: DefIndex) -> ty::ImplPolarity {
880 self.get_impl_data(id).polarity
883 fn get_impl_defaultness(&self, id: DefIndex) -> hir::Defaultness {
884 self.get_impl_data(id).defaultness
887 fn get_coerce_unsized_info(&self, id: DefIndex) -> Option<ty::adjustment::CoerceUnsizedInfo> {
888 self.get_impl_data(id).coerce_unsized_info
891 fn get_impl_trait(&self, id: DefIndex, tcx: TyCtxt<'tcx>) -> Option<ty::TraitRef<'tcx>> {
892 self.root.per_def.impl_trait_ref.get(self, id).map(|tr| tr.decode((self, tcx)))
895 /// Iterates over all the stability attributes in the given crate.
896 fn get_lib_features(&self, tcx: TyCtxt<'tcx>) -> &'tcx [(ast::Name, Option<ast::Name>)] {
897 // FIXME: For a proc macro crate, not sure whether we should return the "host"
898 // features or an empty Vec. Both don't cause ICEs.
899 tcx.arena.alloc_from_iter(self.root.lib_features.decode(self))
902 /// Iterates over the language items in the given crate.
903 fn get_lang_items(&self, tcx: TyCtxt<'tcx>) -> &'tcx [(DefId, usize)] {
904 if self.root.is_proc_macro_crate() {
905 // Proc macro crates do not export any lang-items to the target.
908 tcx.arena.alloc_from_iter(
912 .map(|(def_index, index)| (self.local_def_id(def_index), index)),
917 /// Iterates over the diagnostic items in the given crate.
918 fn get_diagnostic_items(&self, tcx: TyCtxt<'tcx>) -> &'tcx FxHashMap<Symbol, DefId> {
919 tcx.arena.alloc(if self.root.is_proc_macro_crate() {
920 // Proc macro crates do not export any diagnostic-items to the target.
926 .map(|(name, def_index)| (name, self.local_def_id(def_index)))
931 /// Iterates over each child of the given item.
932 fn each_child_of_item<F>(&self, id: DefIndex, mut callback: F, sess: &Session)
934 F: FnMut(Export<hir::HirId>),
936 if let Some(proc_macros_ids) = self.root.proc_macro_data.map(|d| d.decode(self)) {
937 /* If we are loading as a proc macro, we want to return the view of this crate
938 * as a proc macro crate.
940 if id == CRATE_DEF_INDEX {
941 for def_index in proc_macros_ids {
942 let raw_macro = self.raw_proc_macro(def_index);
944 DefKind::Macro(macro_kind(raw_macro)),
945 self.local_def_id(def_index),
947 let ident = Ident::from_str(raw_macro.name());
948 callback(Export { ident, res, vis: ty::Visibility::Public, span: DUMMY_SP });
955 let kind = match self.maybe_kind(id) {
960 // Iterate over all children.
961 let macros_only = self.dep_kind.lock().macros_only();
962 let children = self.root.per_def.children.get(self, id).unwrap_or(Lazy::empty());
963 for child_index in children.decode((self, sess)) {
969 if let Some(child_kind) = self.maybe_kind(child_index) {
971 EntryKind::MacroDef(..) => {}
972 _ if macros_only => continue,
976 // Hand off the item to the callback.
978 // FIXME(eddyb) Don't encode these in children.
979 EntryKind::ForeignMod => {
980 let child_children = self
984 .get(self, child_index)
985 .unwrap_or(Lazy::empty());
986 for child_index in child_children.decode((self, sess)) {
987 if let Some(kind) = self.def_kind(child_index) {
989 res: Res::Def(kind, self.local_def_id(child_index)),
990 ident: Ident::with_dummy_span(self.item_name(child_index)),
991 vis: self.get_visibility(child_index),
996 .get(self, child_index)
998 .decode((self, sess)),
1004 EntryKind::Impl(_) => continue,
1009 let def_key = self.def_key(child_index);
1010 let span = self.get_span(child_index, sess);
1011 if let (Some(kind), Some(name)) =
1012 (self.def_kind(child_index), def_key.disambiguated_data.data.get_opt_name())
1014 let ident = Ident::with_dummy_span(name);
1015 let vis = self.get_visibility(child_index);
1016 let def_id = self.local_def_id(child_index);
1017 let res = Res::Def(kind, def_id);
1018 callback(Export { res, ident, vis, span });
1019 // For non-re-export structs and variants add their constructors to children.
1020 // Re-export lists automatically contain constructors when necessary.
1022 DefKind::Struct => {
1023 if let Some(ctor_def_id) = self.get_ctor_def_id(child_index) {
1024 let ctor_kind = self.get_ctor_kind(child_index);
1026 Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);
1027 let vis = self.get_visibility(ctor_def_id.index);
1028 callback(Export { res: ctor_res, vis, ident, span });
1031 DefKind::Variant => {
1032 // Braced variants, unlike structs, generate unusable names in
1033 // value namespace, they are reserved for possible future use.
1034 // It's ok to use the variant's id as a ctor id since an
1035 // error will be reported on any use of such resolution anyway.
1036 let ctor_def_id = self.get_ctor_def_id(child_index).unwrap_or(def_id);
1037 let ctor_kind = self.get_ctor_kind(child_index);
1039 Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id);
1040 let mut vis = self.get_visibility(ctor_def_id.index);
1041 if ctor_def_id == def_id && vis == ty::Visibility::Public {
1042 // For non-exhaustive variants lower the constructor visibility to
1043 // within the crate. We only need this for fictive constructors,
1044 // for other constructors correct visibilities
1045 // were already encoded in metadata.
1046 let attrs = self.get_item_attrs(def_id.index, sess);
1047 if attr::contains_name(&attrs, sym::non_exhaustive) {
1048 let crate_def_id = self.local_def_id(CRATE_DEF_INDEX);
1049 vis = ty::Visibility::Restricted(crate_def_id);
1052 callback(Export { res: ctor_res, ident, vis, span });
1060 if let EntryKind::Mod(data) = kind {
1061 for exp in data.decode((self, sess)).reexports.decode((self, sess)) {
1063 Res::Def(DefKind::Macro(..), _) => {}
1064 _ if macros_only => continue,
1072 fn is_item_mir_available(&self, id: DefIndex) -> bool {
1073 !self.is_proc_macro(id) && self.root.per_def.mir.get(self, id).is_some()
1076 fn get_optimized_mir(&self, tcx: TyCtxt<'tcx>, id: DefIndex) -> BodyAndCache<'tcx> {
1077 let mut cache = self
1082 .filter(|_| !self.is_proc_macro(id))
1083 .unwrap_or_else(|| {
1084 bug!("get_optimized_mir: missing MIR for `{:?}`", self.local_def_id(id))
1086 .decode((self, tcx));
1087 cache.ensure_predecessors();
1091 fn get_promoted_mir(
1095 ) -> IndexVec<Promoted, BodyAndCache<'tcx>> {
1096 let mut cache = self
1101 .filter(|_| !self.is_proc_macro(id))
1102 .unwrap_or_else(|| {
1103 bug!("get_promoted_mir: missing MIR for `{:?}`", self.local_def_id(id))
1105 .decode((self, tcx));
1106 for body in cache.iter_mut() {
1107 body.ensure_predecessors();
1112 fn mir_const_qualif(&self, id: DefIndex) -> mir::ConstQualifs {
1113 match self.kind(id) {
1114 EntryKind::Const(qualif, _)
1115 | EntryKind::AssocConst(AssocContainer::ImplDefault, qualif, _)
1116 | EntryKind::AssocConst(AssocContainer::ImplFinal, qualif, _) => qualif,
1121 fn get_associated_item(&self, id: DefIndex) -> ty::AssocItem {
1122 let def_key = self.def_key(id);
1123 let parent = self.local_def_id(def_key.parent.unwrap());
1124 let name = def_key.disambiguated_data.data.get_opt_name().unwrap();
1126 let (kind, container, has_self) = match self.kind(id) {
1127 EntryKind::AssocConst(container, _, _) => (ty::AssocKind::Const, container, false),
1128 EntryKind::Method(data) => {
1129 let data = data.decode(self);
1130 (ty::AssocKind::Method, data.container, data.has_self)
1132 EntryKind::AssocType(container) => (ty::AssocKind::Type, container, false),
1133 EntryKind::AssocOpaqueTy(container) => (ty::AssocKind::OpaqueTy, container, false),
1134 _ => bug!("cannot get associated-item of `{:?}`", def_key),
1138 ident: Ident::with_dummy_span(name),
1140 vis: self.get_visibility(id),
1141 defaultness: container.defaultness(),
1142 def_id: self.local_def_id(id),
1143 container: container.with_def_id(parent),
1144 method_has_self_argument: has_self,
1148 fn get_item_variances(&self, id: DefIndex) -> Vec<ty::Variance> {
1149 self.root.per_def.variances.get(self, id).unwrap_or(Lazy::empty()).decode(self).collect()
1152 fn get_ctor_kind(&self, node_id: DefIndex) -> CtorKind {
1153 match self.kind(node_id) {
1154 EntryKind::Struct(data, _) | EntryKind::Union(data, _) | EntryKind::Variant(data) => {
1155 data.decode(self).ctor_kind
1157 _ => CtorKind::Fictive,
1161 fn get_ctor_def_id(&self, node_id: DefIndex) -> Option<DefId> {
1162 match self.kind(node_id) {
1163 EntryKind::Struct(data, _) => {
1164 data.decode(self).ctor.map(|index| self.local_def_id(index))
1166 EntryKind::Variant(data) => {
1167 data.decode(self).ctor.map(|index| self.local_def_id(index))
1173 fn get_item_attrs(&self, node_id: DefIndex, sess: &Session) -> Lrc<[ast::Attribute]> {
1174 // The attributes for a tuple struct/variant are attached to the definition, not the ctor;
1175 // we assume that someone passing in a tuple struct ctor is actually wanting to
1176 // look at the definition
1177 let def_key = self.def_key(node_id);
1178 let item_id = if def_key.disambiguated_data.data == DefPathData::Ctor {
1179 def_key.parent.unwrap()
1189 .unwrap_or(Lazy::empty())
1190 .decode((self, sess))
1191 .collect::<Vec<_>>(),
1195 fn get_struct_field_names(&self, id: DefIndex, sess: &Session) -> Vec<Spanned<ast::Name>> {
1200 .unwrap_or(Lazy::empty())
1202 .map(|index| respan(self.get_span(index, sess), self.item_name(index)))
1206 // Translate a DefId from the current compilation environment to a DefId
1207 // for an external crate.
1208 fn reverse_translate_def_id(&self, did: DefId) -> Option<DefId> {
1209 for (local, &global) in self.cnum_map.iter_enumerated() {
1210 if global == did.krate {
1211 return Some(DefId { krate: local, index: did.index });
1218 fn get_inherent_implementations_for_type(
1222 ) -> &'tcx [DefId] {
1223 tcx.arena.alloc_from_iter(
1228 .unwrap_or(Lazy::empty())
1230 .map(|index| self.local_def_id(index)),
1234 fn get_implementations_for_trait(
1237 filter: Option<DefId>,
1238 ) -> &'tcx [DefId] {
1239 if self.root.is_proc_macro_crate() {
1240 // proc-macro crates export no trait impls.
1244 // Do a reverse lookup beforehand to avoid touching the crate_num
1245 // hash map in the loop below.
1246 let filter = match filter.map(|def_id| self.reverse_translate_def_id(def_id)) {
1247 Some(Some(def_id)) => Some((def_id.krate.as_u32(), def_id.index)),
1248 Some(None) => return &[],
1252 if let Some(filter) = filter {
1253 if let Some(impls) = self.trait_impls.get(&filter) {
1254 tcx.arena.alloc_from_iter(impls.decode(self).map(|idx| self.local_def_id(idx)))
1259 tcx.arena.alloc_from_iter(
1262 .flat_map(|impls| impls.decode(self).map(|idx| self.local_def_id(idx))),
1267 fn get_trait_of_item(&self, id: DefIndex) -> Option<DefId> {
1268 let def_key = self.def_key(id);
1269 match def_key.disambiguated_data.data {
1270 DefPathData::TypeNs(..) | DefPathData::ValueNs(..) => (),
1271 // Not an associated item
1274 def_key.parent.and_then(|parent_index| match self.kind(parent_index) {
1275 EntryKind::Trait(_) | EntryKind::TraitAlias => Some(self.local_def_id(parent_index)),
1280 fn get_native_libraries(&self, sess: &Session) -> Vec<NativeLibrary> {
1281 if self.root.is_proc_macro_crate() {
1282 // Proc macro crates do not have any *target* native libraries.
1285 self.root.native_libraries.decode((self, sess)).collect()
1289 fn get_foreign_modules(&self, tcx: TyCtxt<'tcx>) -> &'tcx [ForeignModule] {
1290 if self.root.is_proc_macro_crate() {
1291 // Proc macro crates do not have any *target* foreign modules.
1294 tcx.arena.alloc_from_iter(self.root.foreign_modules.decode((self, tcx.sess)))
1298 fn get_dylib_dependency_formats(
1301 ) -> &'tcx [(CrateNum, LinkagePreference)] {
1302 tcx.arena.alloc_from_iter(
1303 self.root.dylib_dependency_formats.decode(self).enumerate().flat_map(|(i, link)| {
1304 let cnum = CrateNum::new(i + 1);
1305 link.map(|link| (self.cnum_map[cnum], link))
1310 fn get_missing_lang_items(&self, tcx: TyCtxt<'tcx>) -> &'tcx [lang_items::LangItem] {
1311 if self.root.is_proc_macro_crate() {
1312 // Proc macro crates do not depend on any target weak lang-items.
1315 tcx.arena.alloc_from_iter(self.root.lang_items_missing.decode(self))
1319 fn get_fn_param_names(&self, id: DefIndex) -> Vec<ast::Name> {
1320 let param_names = match self.kind(id) {
1321 EntryKind::Fn(data) | EntryKind::ForeignFn(data) => data.decode(self).param_names,
1322 EntryKind::Method(data) => data.decode(self).fn_data.param_names,
1325 param_names.decode(self).collect()
1328 fn exported_symbols(
1331 ) -> Vec<(ExportedSymbol<'tcx>, SymbolExportLevel)> {
1332 if self.root.is_proc_macro_crate() {
1333 // If this crate is a custom derive crate, then we're not even going to
1334 // link those in so we skip those crates.
1337 self.root.exported_symbols.decode((self, tcx)).collect()
1341 fn get_rendered_const(&self, id: DefIndex) -> String {
1342 match self.kind(id) {
1343 EntryKind::Const(_, data) | EntryKind::AssocConst(_, _, data) => data.decode(self).0,
1348 fn get_macro(&self, id: DefIndex) -> MacroDef {
1349 match self.kind(id) {
1350 EntryKind::MacroDef(macro_def) => macro_def.decode(self),
1355 // This replicates some of the logic of the crate-local `is_const_fn_raw` query, because we
1356 // don't serialize constness for tuple variant and tuple struct constructors.
1357 fn is_const_fn_raw(&self, id: DefIndex) -> bool {
1358 let constness = match self.kind(id) {
1359 EntryKind::Method(data) => data.decode(self).fn_data.constness,
1360 EntryKind::Fn(data) => data.decode(self).constness,
1361 // Some intrinsics can be const fn. While we could recompute this (at least until we
1362 // stop having hardcoded whitelists and move to stability attributes), it seems cleaner
1363 // to treat all const fns equally.
1364 EntryKind::ForeignFn(data) => data.decode(self).constness,
1365 EntryKind::Variant(..) | EntryKind::Struct(..) => hir::Constness::Const,
1366 _ => hir::Constness::NotConst,
1368 constness == hir::Constness::Const
1371 fn asyncness(&self, id: DefIndex) -> hir::IsAsync {
1372 match self.kind(id) {
1373 EntryKind::Fn(data) => data.decode(self).asyncness,
1374 EntryKind::Method(data) => data.decode(self).fn_data.asyncness,
1375 EntryKind::ForeignFn(data) => data.decode(self).asyncness,
1376 _ => bug!("asyncness: expected function kind"),
1380 fn is_foreign_item(&self, id: DefIndex) -> bool {
1381 match self.kind(id) {
1382 EntryKind::ForeignImmStatic | EntryKind::ForeignMutStatic | EntryKind::ForeignFn(_) => {
1389 fn static_mutability(&self, id: DefIndex) -> Option<hir::Mutability> {
1390 match self.kind(id) {
1391 EntryKind::ImmStatic | EntryKind::ForeignImmStatic => Some(hir::Mutability::Not),
1392 EntryKind::MutStatic | EntryKind::ForeignMutStatic => Some(hir::Mutability::Mut),
1397 fn fn_sig(&self, id: DefIndex, tcx: TyCtxt<'tcx>) -> ty::PolyFnSig<'tcx> {
1398 self.root.per_def.fn_sig.get(self, id).unwrap().decode((self, tcx))
1402 fn def_key(&self, index: DefIndex) -> DefKey {
1403 let mut key = self.def_path_table.def_key(index);
1404 if self.is_proc_macro(index) {
1405 let name = self.raw_proc_macro(index).name();
1406 key.disambiguated_data.data = DefPathData::MacroNs(Symbol::intern(name));
1411 // Returns the path leading to the thing with this `id`.
1412 fn def_path(&self, id: DefIndex) -> DefPath {
1413 debug!("def_path(cnum={:?}, id={:?})", self.cnum, id);
1414 DefPath::make(self.cnum, id, |parent| self.def_key(parent))
1418 fn def_path_hash(&self, index: DefIndex) -> DefPathHash {
1419 self.def_path_table.def_path_hash(index)
1422 /// Imports the source_map from an external crate into the source_map of the crate
1423 /// currently being compiled (the "local crate").
1425 /// The import algorithm works analogous to how AST items are inlined from an
1426 /// external crate's metadata:
1427 /// For every SourceFile in the external source_map an 'inline' copy is created in the
1428 /// local source_map. The correspondence relation between external and local
1429 /// SourceFiles is recorded in the `ImportedSourceFile` objects returned from this
1430 /// function. When an item from an external crate is later inlined into this
1431 /// crate, this correspondence information is used to translate the span
1432 /// information of the inlined item so that it refers the correct positions in
1433 /// the local source_map (see `<decoder::DecodeContext as SpecializedDecoder<Span>>`).
1435 /// The import algorithm in the function below will reuse SourceFiles already
1436 /// existing in the local source_map. For example, even if the SourceFile of some
1437 /// source file of libstd gets imported many times, there will only ever be
1438 /// one SourceFile object for the corresponding file in the local source_map.
1440 /// Note that imported SourceFiles do not actually contain the source code of the
1441 /// file they represent, just information about length, line breaks, and
1442 /// multibyte characters. This information is enough to generate valid debuginfo
1443 /// for items inlined from other crates.
1445 /// Proc macro crates don't currently export spans, so this function does not have
1446 /// to work for them.
1447 fn imported_source_files(
1449 local_source_map: &source_map::SourceMap,
1450 ) -> &[ImportedSourceFile] {
1451 self.source_map_import_info.init_locking(|| {
1452 let external_source_map = self.root.source_map.decode(self);
1455 .map(|source_file_to_import| {
1456 // We can't reuse an existing SourceFile, so allocate a new one
1457 // containing the information we need.
1458 let rustc_span::SourceFile {
1465 mut multibyte_chars,
1466 mut non_narrow_chars,
1470 } = source_file_to_import;
1472 let source_length = (end_pos - start_pos).to_usize();
1474 // Translate line-start positions and multibyte character
1475 // position into frame of reference local to file.
1476 // `SourceMap::new_imported_source_file()` will then translate those
1477 // coordinates to their new global frame of reference when the
1478 // offset of the SourceFile is known.
1479 for pos in &mut lines {
1480 *pos = *pos - start_pos;
1482 for mbc in &mut multibyte_chars {
1483 mbc.pos = mbc.pos - start_pos;
1485 for swc in &mut non_narrow_chars {
1486 *swc = *swc - start_pos;
1488 for np in &mut normalized_pos {
1489 np.pos = np.pos - start_pos;
1492 let local_version = local_source_map.new_imported_source_file(
1505 "CrateMetaData::imported_source_files alloc \
1506 source_file {:?} original (start_pos {:?} end_pos {:?}) \
1507 translated (start_pos {:?} end_pos {:?})",
1511 local_version.start_pos,
1512 local_version.end_pos
1515 ImportedSourceFile {
1516 original_start_pos: start_pos,
1517 original_end_pos: end_pos,
1518 translated_source_file: local_version,
1525 /// Get the `DepNodeIndex` corresponding this crate. The result of this
1526 /// method is cached in the `dep_node_index` field.
1527 fn get_crate_dep_node_index(&self, tcx: TyCtxt<'tcx>) -> DepNodeIndex {
1528 let mut dep_node_index = self.dep_node_index.load();
1530 if unlikely!(dep_node_index == DepNodeIndex::INVALID) {
1531 // We have not cached the DepNodeIndex for this upstream crate yet,
1532 // so use the dep-graph to find it out and cache it.
1533 // Note that multiple threads can enter this block concurrently.
1534 // That is fine because the DepNodeIndex remains constant
1535 // throughout the whole compilation session, and multiple stores
1536 // would always write the same value.
1538 let def_path_hash = self.def_path_hash(CRATE_DEF_INDEX);
1539 let dep_node = def_path_hash.to_dep_node(dep_graph::DepKind::CrateMetadata);
1541 dep_node_index = tcx.dep_graph.dep_node_index_of(&dep_node);
1542 assert!(dep_node_index != DepNodeIndex::INVALID);
1543 self.dep_node_index.store(dep_node_index);
1549 crate fn dependencies(&self) -> LockGuard<'_, Vec<CrateNum>> {
1550 self.dependencies.borrow()
1553 crate fn add_dependency(&self, cnum: CrateNum) {
1554 self.dependencies.borrow_mut().push(cnum);
1557 crate fn update_extern_crate(&self, new_extern_crate: ExternCrate) -> bool {
1558 let mut extern_crate = self.extern_crate.borrow_mut();
1559 let update = Some(new_extern_crate.rank()) > extern_crate.as_ref().map(ExternCrate::rank);
1561 *extern_crate = Some(new_extern_crate);
1566 crate fn source(&self) -> &CrateSource {
1570 crate fn dep_kind(&self) -> DepKind {
1571 *self.dep_kind.lock()
1574 crate fn update_dep_kind(&self, f: impl FnOnce(DepKind) -> DepKind) {
1575 self.dep_kind.with_lock(|dep_kind| *dep_kind = f(*dep_kind))
1578 crate fn panic_strategy(&self) -> PanicStrategy {
1579 self.root.panic_strategy
1582 crate fn needs_panic_runtime(&self) -> bool {
1583 self.root.needs_panic_runtime
1586 crate fn is_panic_runtime(&self) -> bool {
1587 self.root.panic_runtime
1590 crate fn is_profiler_runtime(&self) -> bool {
1591 self.root.profiler_runtime
1594 crate fn needs_allocator(&self) -> bool {
1595 self.root.needs_allocator
1598 crate fn has_global_allocator(&self) -> bool {
1599 self.root.has_global_allocator
1602 crate fn has_default_lib_allocator(&self) -> bool {
1603 self.root.has_default_lib_allocator
1606 crate fn is_proc_macro_crate(&self) -> bool {
1607 self.root.is_proc_macro_crate()
1610 crate fn name(&self) -> Symbol {
1614 crate fn disambiguator(&self) -> CrateDisambiguator {
1615 self.root.disambiguator
1618 crate fn hash(&self) -> Svh {
1623 // Cannot be implemented on 'ProcMacro', as libproc_macro
1624 // does not depend on libsyntax
1625 fn macro_kind(raw: &ProcMacro) -> MacroKind {
1627 ProcMacro::CustomDerive { .. } => MacroKind::Derive,
1628 ProcMacro::Attr { .. } => MacroKind::Attr,
1629 ProcMacro::Bang { .. } => MacroKind::Bang,