1 // Decoding metadata from a single crate's metadata
3 use crate::creader::CrateMetadataRef;
4 use crate::rmeta::table::{FixedSizeEncoding, Table};
8 use rustc_attr as attr;
9 use rustc_data_structures::captures::Captures;
10 use rustc_data_structures::fx::FxHashMap;
11 use rustc_data_structures::svh::Svh;
12 use rustc_data_structures::sync::{Lock, LockGuard, Lrc, OnceCell};
13 use rustc_data_structures::unhash::UnhashMap;
14 use rustc_errors::ErrorReported;
15 use rustc_expand::base::{SyntaxExtension, SyntaxExtensionKind};
16 use rustc_expand::proc_macro::{AttrProcMacro, BangProcMacro, ProcMacroDerive};
18 use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
19 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, CRATE_DEF_INDEX, LOCAL_CRATE};
20 use rustc_hir::definitions::{DefKey, DefPath, DefPathData, DefPathHash};
21 use rustc_hir::diagnostic_items::DiagnosticItems;
22 use rustc_hir::lang_items;
23 use rustc_index::vec::{Idx, IndexVec};
24 use rustc_middle::metadata::ModChild;
25 use rustc_middle::middle::exported_symbols::{ExportedSymbol, SymbolExportLevel};
26 use rustc_middle::mir::interpret::{AllocDecodingSession, AllocDecodingState};
27 use rustc_middle::mir::{self, Body, Promoted};
28 use rustc_middle::thir;
29 use rustc_middle::ty::codec::TyDecoder;
30 use rustc_middle::ty::fast_reject::SimplifiedType;
31 use rustc_middle::ty::{self, Ty, TyCtxt, Visibility};
32 use rustc_serialize::{opaque, Decodable, Decoder};
33 use rustc_session::cstore::{
34 CrateSource, ExternCrate, ForeignModule, LinkagePreference, NativeLib,
36 use rustc_session::Session;
37 use rustc_span::hygiene::{ExpnIndex, MacroKind};
38 use rustc_span::source_map::{respan, Spanned};
39 use rustc_span::symbol::{sym, Ident, Symbol};
40 use rustc_span::{self, BytePos, ExpnId, Pos, Span, SyntaxContext, DUMMY_SP};
42 use proc_macro::bridge::client::ProcMacro;
45 use std::num::NonZeroUsize;
49 pub(super) use cstore_impl::provide;
50 pub use cstore_impl::provide_extern;
51 use rustc_span::hygiene::HygieneDecodeContext;
55 /// A reference to the raw binary version of crate metadata.
56 /// A `MetadataBlob` internally is just a reference counted pointer to
57 /// the actual data, so cloning it is cheap.
59 crate struct MetadataBlob(Lrc<MetadataRef>);
61 // This is needed so we can create an OwningRef into the blob.
62 // The data behind a `MetadataBlob` has a stable address because it is
63 // contained within an Rc/Arc.
64 unsafe impl rustc_data_structures::owning_ref::StableAddress for MetadataBlob {}
66 // This is needed so we can create an OwningRef into the blob.
67 impl std::ops::Deref for MetadataBlob {
71 fn deref(&self) -> &[u8] {
76 // A map from external crate numbers (as decoded from some crate file) to
77 // local crate numbers (as generated during this session). Each external
78 // crate may refer to types in other external crates, and each has their
80 crate type CrateNumMap = IndexVec<CrateNum, CrateNum>;
82 crate struct CrateMetadata {
83 /// The primary crate data - binary metadata blob.
86 // --- Some data pre-decoded from the metadata blob, usually for performance ---
87 /// Properties of the whole crate.
88 /// NOTE(eddyb) we pass `'static` to a `'tcx` parameter because this
89 /// lifetime is only used behind `Lazy`, and therefore acts like a
90 /// universal (`for<'tcx>`), that is paired up with whichever `TyCtxt`
91 /// is being used to decode those values.
92 root: CrateRoot<'static>,
94 /// FIXME: Used only from queries and can use query cache,
95 /// so pre-decoding can probably be avoided.
96 trait_impls: FxHashMap<(u32, DefIndex), Lazy<[(DefIndex, Option<SimplifiedType>)]>>,
97 /// Proc macro descriptions for this crate, if it's a proc macro crate.
98 raw_proc_macros: Option<&'static [ProcMacro]>,
99 /// Source maps for code from the crate.
100 source_map_import_info: OnceCell<Vec<ImportedSourceFile>>,
101 /// For every definition in this crate, maps its `DefPathHash` to its `DefIndex`.
102 def_path_hash_map: DefPathHashMapRef<'static>,
103 /// Likewise for ExpnHash.
104 expn_hash_map: OnceCell<UnhashMap<ExpnHash, ExpnIndex>>,
105 /// Used for decoding interpret::AllocIds in a cached & thread-safe manner.
106 alloc_decoding_state: AllocDecodingState,
107 /// Caches decoded `DefKey`s.
108 def_key_cache: Lock<FxHashMap<DefIndex, DefKey>>,
109 /// Caches decoded `DefPathHash`es.
110 def_path_hash_cache: Lock<FxHashMap<DefIndex, DefPathHash>>,
112 // --- Other significant crate properties ---
113 /// ID of this crate, from the current compilation session's point of view.
115 /// Maps crate IDs as they are were seen from this crate's compilation sessions into
116 /// IDs as they are seen from the current compilation session.
117 cnum_map: CrateNumMap,
118 /// Same ID set as `cnum_map` plus maybe some injected crates like panic runtime.
119 dependencies: Lock<Vec<CrateNum>>,
120 /// How to link (or not link) this crate to the currently compiled crate.
121 dep_kind: Lock<CrateDepKind>,
122 /// Filesystem location of this crate.
124 /// Whether or not this crate should be consider a private dependency
125 /// for purposes of the 'exported_private_dependencies' lint
127 /// The hash for the host proc macro. Used to support `-Z dual-proc-macro`.
128 host_hash: Option<Svh>,
130 /// Additional data used for decoding `HygieneData` (e.g. `SyntaxContext`
132 /// Note that we store a `HygieneDecodeContext` for each `CrateMetadat`. This is
133 /// because `SyntaxContext` ids are not globally unique, so we need
134 /// to track which ids we've decoded on a per-crate basis.
135 hygiene_context: HygieneDecodeContext,
137 // --- Data used only for improving diagnostics ---
138 /// Information about the `extern crate` item or path that caused this crate to be loaded.
139 /// If this is `None`, then the crate was injected (e.g., by the allocator).
140 extern_crate: Lock<Option<ExternCrate>>,
143 /// Holds information about a rustc_span::SourceFile imported from another crate.
144 /// See `imported_source_files()` for more information.
145 struct ImportedSourceFile {
146 /// This SourceFile's byte-offset within the source_map of its original crate
147 original_start_pos: rustc_span::BytePos,
148 /// The end of this SourceFile within the source_map of its original crate
149 original_end_pos: rustc_span::BytePos,
150 /// The imported SourceFile's representation within the local source_map
151 translated_source_file: Lrc<rustc_span::SourceFile>,
154 pub(super) struct DecodeContext<'a, 'tcx> {
155 opaque: opaque::Decoder<'a>,
156 cdata: Option<CrateMetadataRef<'a>>,
157 blob: &'a MetadataBlob,
158 sess: Option<&'tcx Session>,
159 tcx: Option<TyCtxt<'tcx>>,
161 // Cache the last used source_file for translating spans as an optimization.
162 last_source_file_index: usize,
164 lazy_state: LazyState,
166 // Used for decoding interpret::AllocIds in a cached & thread-safe manner.
167 alloc_decoding_session: Option<AllocDecodingSession<'a>>,
170 /// Abstract over the various ways one can create metadata decoders.
171 pub(super) trait Metadata<'a, 'tcx>: Copy {
172 fn blob(self) -> &'a MetadataBlob;
174 fn cdata(self) -> Option<CrateMetadataRef<'a>> {
177 fn sess(self) -> Option<&'tcx Session> {
180 fn tcx(self) -> Option<TyCtxt<'tcx>> {
184 fn decoder(self, pos: usize) -> DecodeContext<'a, 'tcx> {
185 let tcx = self.tcx();
187 opaque: opaque::Decoder::new(self.blob(), pos),
190 sess: self.sess().or(tcx.map(|tcx| tcx.sess)),
192 last_source_file_index: 0,
193 lazy_state: LazyState::NoNode,
194 alloc_decoding_session: self
196 .map(|cdata| cdata.cdata.alloc_decoding_state.new_decoding_session()),
201 impl<'a, 'tcx> Metadata<'a, 'tcx> for &'a MetadataBlob {
203 fn blob(self) -> &'a MetadataBlob {
208 impl<'a, 'tcx> Metadata<'a, 'tcx> for (&'a MetadataBlob, &'tcx Session) {
210 fn blob(self) -> &'a MetadataBlob {
215 fn sess(self) -> Option<&'tcx Session> {
216 let (_, sess) = self;
221 impl<'a, 'tcx> Metadata<'a, 'tcx> for CrateMetadataRef<'a> {
223 fn blob(self) -> &'a MetadataBlob {
227 fn cdata(self) -> Option<CrateMetadataRef<'a>> {
232 impl<'a, 'tcx> Metadata<'a, 'tcx> for (CrateMetadataRef<'a>, &'tcx Session) {
234 fn blob(self) -> &'a MetadataBlob {
238 fn cdata(self) -> Option<CrateMetadataRef<'a>> {
242 fn sess(self) -> Option<&'tcx Session> {
247 impl<'a, 'tcx> Metadata<'a, 'tcx> for (CrateMetadataRef<'a>, TyCtxt<'tcx>) {
249 fn blob(self) -> &'a MetadataBlob {
253 fn cdata(self) -> Option<CrateMetadataRef<'a>> {
257 fn tcx(self) -> Option<TyCtxt<'tcx>> {
262 impl<'a, 'tcx, T: Decodable<DecodeContext<'a, 'tcx>>> Lazy<T> {
263 fn decode<M: Metadata<'a, 'tcx>>(self, metadata: M) -> T {
264 let mut dcx = metadata.decoder(self.position.get());
265 dcx.lazy_state = LazyState::NodeStart(self.position);
270 impl<'a: 'x, 'tcx: 'x, 'x, T: Decodable<DecodeContext<'a, 'tcx>>> Lazy<[T]> {
271 fn decode<M: Metadata<'a, 'tcx>>(
274 ) -> impl ExactSizeIterator<Item = T> + Captures<'a> + Captures<'tcx> + 'x {
275 let mut dcx = metadata.decoder(self.position.get());
276 dcx.lazy_state = LazyState::NodeStart(self.position);
277 (0..self.meta).map(move |_| T::decode(&mut dcx))
281 impl<'a, 'tcx> DecodeContext<'a, 'tcx> {
283 fn tcx(&self) -> TyCtxt<'tcx> {
284 debug_assert!(self.tcx.is_some(), "missing TyCtxt in DecodeContext");
289 pub fn blob(&self) -> &'a MetadataBlob {
294 pub fn cdata(&self) -> CrateMetadataRef<'a> {
295 debug_assert!(self.cdata.is_some(), "missing CrateMetadata in DecodeContext");
299 fn map_encoded_cnum_to_current(&self, cnum: CrateNum) -> CrateNum {
300 if cnum == LOCAL_CRATE { self.cdata().cnum } else { self.cdata().cnum_map[cnum] }
303 fn read_lazy_with_meta<T: ?Sized + LazyMeta>(&mut self, meta: T::Meta) -> Lazy<T> {
304 let distance = self.read_usize();
305 let position = match self.lazy_state {
306 LazyState::NoNode => bug!("read_lazy_with_meta: outside of a metadata node"),
307 LazyState::NodeStart(start) => {
308 let start = start.get();
309 assert!(distance <= start);
312 LazyState::Previous(last_pos) => last_pos.get() + distance,
314 self.lazy_state = LazyState::Previous(NonZeroUsize::new(position).unwrap());
315 Lazy::from_position_and_meta(NonZeroUsize::new(position).unwrap(), meta)
319 pub fn read_raw_bytes(&mut self, len: usize) -> &'a [u8] {
320 self.opaque.read_raw_bytes(len)
324 impl<'a, 'tcx> TyDecoder<'tcx> for DecodeContext<'a, 'tcx> {
325 const CLEAR_CROSS_CRATE: bool = true;
328 fn tcx(&self) -> TyCtxt<'tcx> {
329 self.tcx.expect("missing TyCtxt in DecodeContext")
333 fn peek_byte(&self) -> u8 {
334 self.opaque.data[self.opaque.position()]
338 fn position(&self) -> usize {
339 self.opaque.position()
342 fn cached_ty_for_shorthand<F>(&mut self, shorthand: usize, or_insert_with: F) -> Ty<'tcx>
344 F: FnOnce(&mut Self) -> Ty<'tcx>,
346 let tcx = self.tcx();
348 let key = ty::CReaderCacheKey { cnum: Some(self.cdata().cnum), pos: shorthand };
350 if let Some(&ty) = tcx.ty_rcache.borrow().get(&key) {
354 let ty = or_insert_with(self);
355 tcx.ty_rcache.borrow_mut().insert(key, ty);
359 fn with_position<F, R>(&mut self, pos: usize, f: F) -> R
361 F: FnOnce(&mut Self) -> R,
363 let new_opaque = opaque::Decoder::new(self.opaque.data, pos);
364 let old_opaque = mem::replace(&mut self.opaque, new_opaque);
365 let old_state = mem::replace(&mut self.lazy_state, LazyState::NoNode);
367 self.opaque = old_opaque;
368 self.lazy_state = old_state;
372 fn decode_alloc_id(&mut self) -> rustc_middle::mir::interpret::AllocId {
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> Decodable<DecodeContext<'a, 'tcx>> for CrateNum {
382 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> CrateNum {
383 let cnum = CrateNum::from_u32(d.read_u32());
384 d.map_encoded_cnum_to_current(cnum)
388 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for DefIndex {
389 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> DefIndex {
390 DefIndex::from_u32(d.read_u32())
394 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for ExpnIndex {
395 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> ExpnIndex {
396 ExpnIndex::from_u32(d.read_u32())
400 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for SyntaxContext {
401 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> SyntaxContext {
402 let cdata = decoder.cdata();
403 let sess = decoder.sess.unwrap();
404 let cname = cdata.root.name;
405 rustc_span::hygiene::decode_syntax_context(decoder, &cdata.hygiene_context, |_, id| {
406 debug!("SpecializedDecoder<SyntaxContext>: decoding {}", id);
411 .unwrap_or_else(|| panic!("Missing SyntaxContext {:?} for crate {:?}", id, cname))
412 .decode((cdata, sess))
417 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for ExpnId {
418 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> ExpnId {
419 let local_cdata = decoder.cdata();
420 let sess = decoder.sess.unwrap();
422 let cnum = CrateNum::decode(decoder);
423 let index = u32::decode(decoder);
425 let expn_id = rustc_span::hygiene::decode_expn_id(cnum, index, |expn_id| {
426 let ExpnId { krate: cnum, local_id: index } = expn_id;
427 // Lookup local `ExpnData`s in our own crate data. Foreign `ExpnData`s
428 // are stored in the owning crate, to avoid duplication.
429 debug_assert_ne!(cnum, LOCAL_CRATE);
430 let crate_data = if cnum == local_cdata.cnum {
433 local_cdata.cstore.get_crate_data(cnum)
435 let expn_data = crate_data
438 .get(crate_data, index)
440 .decode((crate_data, sess));
441 let expn_hash = crate_data
444 .get(crate_data, index)
446 .decode((crate_data, sess));
447 (expn_data, expn_hash)
453 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for Span {
454 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Span {
455 let ctxt = SyntaxContext::decode(decoder);
456 let tag = u8::decode(decoder);
458 if tag == TAG_PARTIAL_SPAN {
459 return DUMMY_SP.with_ctxt(ctxt);
462 debug_assert!(tag == TAG_VALID_SPAN_LOCAL || tag == TAG_VALID_SPAN_FOREIGN);
464 let lo = BytePos::decode(decoder);
465 let len = BytePos::decode(decoder);
468 let Some(sess) = decoder.sess else {
469 bug!("Cannot decode Span without Session.")
472 // There are two possibilities here:
473 // 1. This is a 'local span', which is located inside a `SourceFile`
474 // that came from this crate. In this case, we use the source map data
475 // encoded in this crate. This branch should be taken nearly all of the time.
476 // 2. This is a 'foreign span', which is located inside a `SourceFile`
477 // that came from a *different* crate (some crate upstream of the one
478 // whose metadata we're looking at). For example, consider this dependency graph:
482 // Suppose that we're currently compiling crate A, and start deserializing
483 // metadata from crate B. When we deserialize a Span from crate B's metadata,
484 // there are two posibilites:
486 // 1. The span references a file from crate B. This makes it a 'local' span,
487 // which means that we can use crate B's serialized source map information.
488 // 2. The span references a file from crate C. This makes it a 'foreign' span,
489 // which means we need to use Crate *C* (not crate B) to determine the source
490 // map information. We only record source map information for a file in the
491 // crate that 'owns' it, so deserializing a Span may require us to look at
492 // a transitive dependency.
494 // When we encode a foreign span, we adjust its 'lo' and 'high' values
495 // to be based on the *foreign* crate (e.g. crate C), not the crate
496 // we are writing metadata for (e.g. crate B). This allows us to
497 // treat the 'local' and 'foreign' cases almost identically during deserialization:
498 // we can call `imported_source_files` for the proper crate, and binary search
499 // through the returned slice using our span.
500 let imported_source_files = if tag == TAG_VALID_SPAN_LOCAL {
501 decoder.cdata().imported_source_files(sess)
503 // When we encode a proc-macro crate, all `Span`s should be encoded
504 // with `TAG_VALID_SPAN_LOCAL`
505 if decoder.cdata().root.is_proc_macro_crate() {
506 // Decode `CrateNum` as u32 - using `CrateNum::decode` will ICE
507 // since we don't have `cnum_map` populated.
508 let cnum = u32::decode(decoder);
510 "Decoding of crate {:?} tried to access proc-macro dep {:?}",
511 decoder.cdata().root.name,
515 // tag is TAG_VALID_SPAN_FOREIGN, checked by `debug_assert` above
516 let cnum = CrateNum::decode(decoder);
518 "SpecializedDecoder<Span>::specialized_decode: loading source files from cnum {:?}",
522 // Decoding 'foreign' spans should be rare enough that it's
523 // not worth it to maintain a per-CrateNum cache for `last_source_file_index`.
524 // We just set it to 0, to ensure that we don't try to access something out
525 // of bounds for our initial 'guess'
526 decoder.last_source_file_index = 0;
528 let foreign_data = decoder.cdata().cstore.get_crate_data(cnum);
529 foreign_data.imported_source_files(sess)
533 // Optimize for the case that most spans within a translated item
534 // originate from the same source_file.
535 let last_source_file = &imported_source_files[decoder.last_source_file_index];
537 if lo >= last_source_file.original_start_pos && lo <= last_source_file.original_end_pos
541 let index = imported_source_files
542 .binary_search_by_key(&lo, |source_file| source_file.original_start_pos)
543 .unwrap_or_else(|index| index - 1);
545 // Don't try to cache the index for foreign spans,
546 // as this would require a map from CrateNums to indices
547 if tag == TAG_VALID_SPAN_LOCAL {
548 decoder.last_source_file_index = index;
550 &imported_source_files[index]
554 // Make sure our binary search above is correct.
556 lo >= source_file.original_start_pos && lo <= source_file.original_end_pos,
557 "Bad binary search: lo={:?} source_file.original_start_pos={:?} source_file.original_end_pos={:?}",
559 source_file.original_start_pos,
560 source_file.original_end_pos
563 // Make sure we correctly filtered out invalid spans during encoding
565 hi >= source_file.original_start_pos && hi <= source_file.original_end_pos,
566 "Bad binary search: hi={:?} source_file.original_start_pos={:?} source_file.original_end_pos={:?}",
568 source_file.original_start_pos,
569 source_file.original_end_pos
573 (lo + source_file.translated_source_file.start_pos) - source_file.original_start_pos;
575 (hi + source_file.translated_source_file.start_pos) - source_file.original_start_pos;
577 // Do not try to decode parent for foreign spans.
578 Span::new(lo, hi, ctxt, None)
582 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for &'tcx [thir::abstract_const::Node<'tcx>] {
583 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> Self {
584 ty::codec::RefDecodable::decode(d)
588 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for &'tcx [(ty::Predicate<'tcx>, Span)] {
589 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> Self {
590 ty::codec::RefDecodable::decode(d)
594 impl<'a, 'tcx, T: Decodable<DecodeContext<'a, 'tcx>>> Decodable<DecodeContext<'a, 'tcx>>
597 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Self {
598 decoder.read_lazy_with_meta(())
602 impl<'a, 'tcx, T: Decodable<DecodeContext<'a, 'tcx>>> Decodable<DecodeContext<'a, 'tcx>>
605 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Self {
606 let len = decoder.read_usize();
607 if len == 0 { Lazy::empty() } else { decoder.read_lazy_with_meta(len) }
611 impl<'a, 'tcx, I: Idx, T: Decodable<DecodeContext<'a, 'tcx>>> Decodable<DecodeContext<'a, 'tcx>>
612 for Lazy<Table<I, T>>
614 Option<T>: FixedSizeEncoding,
616 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Self {
617 let len = decoder.read_usize();
618 decoder.read_lazy_with_meta(len)
622 implement_ty_decoder!(DecodeContext<'a, 'tcx>);
624 impl<'tcx> MetadataBlob {
625 crate fn new(metadata_ref: MetadataRef) -> MetadataBlob {
626 MetadataBlob(Lrc::new(metadata_ref))
629 crate fn is_compatible(&self) -> bool {
630 self.blob().starts_with(METADATA_HEADER)
633 crate fn get_rustc_version(&self) -> String {
634 Lazy::<String>::from_position(NonZeroUsize::new(METADATA_HEADER.len() + 4).unwrap())
638 crate fn get_root(&self) -> CrateRoot<'tcx> {
639 let slice = &self.blob()[..];
640 let offset = METADATA_HEADER.len();
641 let pos = (((slice[offset + 0] as u32) << 24)
642 | ((slice[offset + 1] as u32) << 16)
643 | ((slice[offset + 2] as u32) << 8)
644 | ((slice[offset + 3] as u32) << 0)) as usize;
645 Lazy::<CrateRoot<'tcx>>::from_position(NonZeroUsize::new(pos).unwrap()).decode(self)
648 crate fn list_crate_metadata(&self, out: &mut dyn io::Write) -> io::Result<()> {
649 let root = self.get_root();
650 writeln!(out, "Crate info:")?;
651 writeln!(out, "name {}{}", root.name, root.extra_filename)?;
652 writeln!(out, "hash {} stable_crate_id {:?}", root.hash, root.stable_crate_id)?;
653 writeln!(out, "proc_macro {:?}", root.proc_macro_data.is_some())?;
654 writeln!(out, "=External Dependencies=")?;
655 for (i, dep) in root.crate_deps.decode(self).enumerate() {
658 "{} {}{} hash {} host_hash {:?} kind {:?}",
673 crate fn is_proc_macro_crate(&self) -> bool {
674 self.proc_macro_data.is_some()
677 crate fn name(&self) -> Symbol {
681 crate fn hash(&self) -> Svh {
685 crate fn stable_crate_id(&self) -> StableCrateId {
689 crate fn triple(&self) -> &TargetTriple {
693 crate fn decode_crate_deps<'a>(
695 metadata: &'a MetadataBlob,
696 ) -> impl ExactSizeIterator<Item = CrateDep> + Captures<'a> {
697 self.crate_deps.decode(metadata)
701 impl<'a, 'tcx> CrateMetadataRef<'a> {
702 fn raw_proc_macro(self, id: DefIndex) -> &'a ProcMacro {
703 // DefIndex's in root.proc_macro_data have a one-to-one correspondence
704 // with items in 'raw_proc_macros'.
712 .position(|i| i == id)
714 &self.raw_proc_macros.unwrap()[pos]
717 fn opt_item_ident(self, item_index: DefIndex, sess: &Session) -> Option<Ident> {
718 let name = self.def_key(item_index).disambiguated_data.data.get_opt_name()?;
719 let span = match self.root.tables.ident_span.get(self, item_index) {
720 Some(lazy_span) => lazy_span.decode((self, sess)),
722 // FIXME: this weird case of a name with no span is specific to `extern crate`
723 // items, which are supposed to be treated like `use` items and only be encoded
724 // to metadata as `Export`s, return `None` because that's what all the callers
725 // expect in this case.
726 assert_eq!(self.def_kind(item_index), DefKind::ExternCrate);
730 Some(Ident::new(name, span))
733 fn item_ident(self, item_index: DefIndex, sess: &Session) -> Ident {
734 self.opt_item_ident(item_index, sess).expect("no encoded ident for item")
737 fn maybe_kind(self, item_id: DefIndex) -> Option<EntryKind> {
738 self.root.tables.kind.get(self, item_id).map(|k| k.decode(self))
741 fn kind(self, item_id: DefIndex) -> EntryKind {
742 self.maybe_kind(item_id).unwrap_or_else(|| {
744 "CrateMetadata::kind({:?}): id not found, in crate {:?} with number {}",
752 fn def_kind(self, item_id: DefIndex) -> DefKind {
753 self.root.tables.def_kind.get(self, item_id).map(|k| k.decode(self)).unwrap_or_else(|| {
755 "CrateMetadata::def_kind({:?}): id not found, in crate {:?} with number {}",
763 fn get_span(self, index: DefIndex, sess: &Session) -> Span {
768 .unwrap_or_else(|| panic!("Missing span for {:?}", index))
769 .decode((self, sess))
772 fn load_proc_macro(self, id: DefIndex, sess: &Session) -> SyntaxExtension {
773 let (name, kind, helper_attrs) = match *self.raw_proc_macro(id) {
774 ProcMacro::CustomDerive { trait_name, attributes, client } => {
776 attributes.iter().cloned().map(Symbol::intern).collect::<Vec<_>>();
779 SyntaxExtensionKind::Derive(Box::new(ProcMacroDerive { client })),
783 ProcMacro::Attr { name, client } => {
784 (name, SyntaxExtensionKind::Attr(Box::new(AttrProcMacro { client })), Vec::new())
786 ProcMacro::Bang { name, client } => {
787 (name, SyntaxExtensionKind::Bang(Box::new(BangProcMacro { client })), Vec::new())
791 let attrs: Vec<_> = self.get_item_attrs(id, sess).collect();
792 SyntaxExtension::new(
795 self.get_span(id, sess),
798 Symbol::intern(name),
803 fn get_trait_def(self, item_id: DefIndex, sess: &Session) -> ty::TraitDef {
804 match self.kind(item_id) {
805 EntryKind::Trait(data) => {
806 let data = data.decode((self, sess));
808 self.local_def_id(item_id),
813 data.skip_array_during_method_dispatch,
814 data.specialization_kind,
815 self.def_path_hash(item_id),
816 data.must_implement_one_of,
819 EntryKind::TraitAlias => ty::TraitDef::new(
820 self.local_def_id(item_id),
821 hir::Unsafety::Normal,
826 ty::trait_def::TraitSpecializationKind::None,
827 self.def_path_hash(item_id),
830 _ => bug!("def-index does not refer to trait or trait alias"),
840 ) -> ty::VariantDef {
841 let data = match kind {
842 EntryKind::Variant(data) | EntryKind::Struct(data, _) | EntryKind::Union(data, _) => {
848 let adt_kind = match kind {
849 EntryKind::Variant(_) => ty::AdtKind::Enum,
850 EntryKind::Struct(..) => ty::AdtKind::Struct,
851 EntryKind::Union(..) => ty::AdtKind::Union,
856 if adt_kind == ty::AdtKind::Enum { Some(self.local_def_id(index)) } else { None };
857 let ctor_did = data.ctor.map(|index| self.local_def_id(index));
860 self.item_ident(index, sess).name,
868 .unwrap_or_else(Lazy::empty)
870 .map(|index| ty::FieldDef {
871 did: self.local_def_id(index),
872 name: self.item_ident(index, sess).name,
873 vis: self.get_visibility(index),
880 data.is_non_exhaustive,
884 fn get_adt_def(self, item_id: DefIndex, tcx: TyCtxt<'tcx>) -> &'tcx ty::AdtDef {
885 let kind = self.kind(item_id);
886 let did = self.local_def_id(item_id);
888 let (adt_kind, repr) = match kind {
889 EntryKind::Enum(repr) => (ty::AdtKind::Enum, repr),
890 EntryKind::Struct(_, repr) => (ty::AdtKind::Struct, repr),
891 EntryKind::Union(_, repr) => (ty::AdtKind::Union, repr),
892 _ => bug!("get_adt_def called on a non-ADT {:?}", did),
895 let variants = if let ty::AdtKind::Enum = adt_kind {
900 .unwrap_or_else(Lazy::empty)
902 .map(|index| self.get_variant(&self.kind(index), index, did, tcx.sess))
905 std::iter::once(self.get_variant(&kind, item_id, did, tcx.sess)).collect()
908 tcx.alloc_adt_def(did, adt_kind, variants, repr)
911 fn get_explicit_predicates(
915 ) -> ty::GenericPredicates<'tcx> {
916 self.root.tables.explicit_predicates.get(self, item_id).unwrap().decode((self, tcx))
919 fn get_inferred_outlives(
923 ) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
928 .map(|predicates| tcx.arena.alloc_from_iter(predicates.decode((self, tcx))))
932 fn get_super_predicates(
936 ) -> ty::GenericPredicates<'tcx> {
937 self.root.tables.super_predicates.get(self, item_id).unwrap().decode((self, tcx))
940 fn get_explicit_item_bounds(
944 ) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
947 .explicit_item_bounds
949 .map(|bounds| tcx.arena.alloc_from_iter(bounds.decode((self, tcx))))
953 fn get_generics(self, item_id: DefIndex, sess: &Session) -> ty::Generics {
954 self.root.tables.generics.get(self, item_id).unwrap().decode((self, sess))
957 fn get_type(self, id: DefIndex, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
962 .unwrap_or_else(|| panic!("Not a type: {:?}", id))
966 fn get_stability(self, id: DefIndex) -> Option<attr::Stability> {
967 self.root.tables.stability.get(self, id).map(|stab| stab.decode(self))
970 fn get_const_stability(self, id: DefIndex) -> Option<attr::ConstStability> {
971 self.root.tables.const_stability.get(self, id).map(|stab| stab.decode(self))
974 fn get_deprecation(self, id: DefIndex) -> Option<attr::Deprecation> {
975 self.root.tables.deprecation.get(self, id).map(|depr| depr.decode(self))
978 fn get_visibility(self, id: DefIndex) -> ty::Visibility {
979 self.root.tables.visibility.get(self, id).unwrap().decode(self)
982 fn get_impl_data(self, id: DefIndex) -> ImplData {
983 match self.kind(id) {
984 EntryKind::Impl(data) => data.decode(self),
989 fn get_parent_impl(self, id: DefIndex) -> Option<DefId> {
990 self.get_impl_data(id).parent_impl
993 fn get_impl_polarity(self, id: DefIndex) -> ty::ImplPolarity {
994 self.get_impl_data(id).polarity
997 fn get_impl_defaultness(self, id: DefIndex) -> hir::Defaultness {
998 self.get_impl_data(id).defaultness
1001 fn get_impl_constness(self, id: DefIndex) -> hir::Constness {
1002 self.get_impl_data(id).constness
1005 fn get_trait_item_def_id(self, id: DefIndex) -> Option<DefId> {
1006 self.root.tables.trait_item_def_id.get(self, id).map(|d| d.decode(self))
1009 fn get_coerce_unsized_info(self, id: DefIndex) -> Option<ty::adjustment::CoerceUnsizedInfo> {
1010 self.get_impl_data(id).coerce_unsized_info
1013 fn get_impl_trait(self, id: DefIndex, tcx: TyCtxt<'tcx>) -> Option<ty::TraitRef<'tcx>> {
1014 self.root.tables.impl_trait_ref.get(self, id).map(|tr| tr.decode((self, tcx)))
1017 fn get_expn_that_defined(self, id: DefIndex, sess: &Session) -> ExpnId {
1018 self.root.tables.expn_that_defined.get(self, id).unwrap().decode((self, sess))
1021 fn get_const_param_default(
1025 ) -> rustc_middle::ty::Const<'tcx> {
1026 self.root.tables.const_defaults.get(self, id).unwrap().decode((self, tcx))
1029 /// Iterates over all the stability attributes in the given crate.
1030 fn get_lib_features(self, tcx: TyCtxt<'tcx>) -> &'tcx [(Symbol, Option<Symbol>)] {
1031 tcx.arena.alloc_from_iter(self.root.lib_features.decode(self))
1034 /// Iterates over the language items in the given crate.
1035 fn get_lang_items(self, tcx: TyCtxt<'tcx>) -> &'tcx [(DefId, usize)] {
1036 tcx.arena.alloc_from_iter(
1040 .map(|(def_index, index)| (self.local_def_id(def_index), index)),
1044 /// Iterates over the diagnostic items in the given crate.
1045 fn get_diagnostic_items(self) -> DiagnosticItems {
1046 let mut id_to_name = FxHashMap::default();
1047 let name_to_id = self
1051 .map(|(name, def_index)| {
1052 let id = self.local_def_id(def_index);
1053 id_to_name.insert(id, name);
1057 DiagnosticItems { id_to_name, name_to_id }
1060 /// Iterates over all named children of the given module,
1061 /// including both proper items and reexports.
1062 /// Module here is understood in name resolution sense - it can be a `mod` item,
1063 /// or a crate root, or an enum, or a trait.
1064 fn for_each_module_child(
1067 mut callback: impl FnMut(ModChild),
1070 if let Some(data) = &self.root.proc_macro_data {
1071 // If we are loading as a proc macro, we want to return
1072 // the view of this crate as a proc macro crate.
1073 if id == CRATE_DEF_INDEX {
1074 for def_index in data.macros.decode(self) {
1075 let raw_macro = self.raw_proc_macro(def_index);
1077 DefKind::Macro(macro_kind(raw_macro)),
1078 self.local_def_id(def_index),
1080 let ident = self.item_ident(def_index, sess);
1084 vis: ty::Visibility::Public,
1092 // Iterate over all children.
1093 if let Some(children) = self.root.tables.children.get(self, id) {
1094 for child_index in children.decode((self, sess)) {
1095 if let Some(ident) = self.opt_item_ident(child_index, sess) {
1096 let kind = self.def_kind(child_index);
1097 if matches!(kind, DefKind::Macro(..)) {
1098 // FIXME: Macros are currently encoded twice, once as items and once as
1099 // reexports. We ignore the items here and only use the reexports.
1102 let def_id = self.local_def_id(child_index);
1103 let res = Res::Def(kind, def_id);
1104 let vis = self.get_visibility(child_index);
1105 let span = self.get_span(child_index, sess);
1107 callback(ModChild { ident, res, vis, span });
1109 // For non-re-export structs and variants add their constructors to children.
1110 // Re-export lists automatically contain constructors when necessary.
1112 DefKind::Struct => {
1113 if let Some((ctor_def_id, ctor_kind)) =
1114 self.get_ctor_def_id_and_kind(child_index)
1117 Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);
1118 let vis = self.get_visibility(ctor_def_id.index);
1119 callback(ModChild { ident, res: ctor_res, vis, span });
1122 DefKind::Variant => {
1123 // Braced variants, unlike structs, generate unusable names in
1124 // value namespace, they are reserved for possible future use.
1125 // It's ok to use the variant's id as a ctor id since an
1126 // error will be reported on any use of such resolution anyway.
1127 let (ctor_def_id, ctor_kind) = self
1128 .get_ctor_def_id_and_kind(child_index)
1129 .unwrap_or((def_id, CtorKind::Fictive));
1131 Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id);
1132 let mut vis = self.get_visibility(ctor_def_id.index);
1133 if ctor_def_id == def_id && vis.is_public() {
1134 // For non-exhaustive variants lower the constructor visibility to
1135 // within the crate. We only need this for fictive constructors,
1136 // for other constructors correct visibilities
1137 // were already encoded in metadata.
1138 let mut attrs = self.get_item_attrs(def_id.index, sess);
1139 if attrs.any(|item| item.has_name(sym::non_exhaustive)) {
1140 let crate_def_id = self.local_def_id(CRATE_DEF_INDEX);
1141 vis = ty::Visibility::Restricted(crate_def_id);
1144 callback(ModChild { ident, res: ctor_res, vis, span });
1152 match self.kind(id) {
1153 EntryKind::Mod(exports) => {
1154 for exp in exports.decode((self, sess)) {
1158 EntryKind::Enum(..) | EntryKind::Trait(..) => {}
1159 _ => bug!("`for_each_module_child` is called on a non-module: {:?}", self.def_kind(id)),
1163 fn is_ctfe_mir_available(self, id: DefIndex) -> bool {
1164 self.root.tables.mir_for_ctfe.get(self, id).is_some()
1167 fn is_item_mir_available(self, id: DefIndex) -> bool {
1168 self.root.tables.mir.get(self, id).is_some()
1171 fn module_expansion(self, id: DefIndex, sess: &Session) -> ExpnId {
1172 match self.kind(id) {
1173 EntryKind::Mod(_) | EntryKind::Enum(_) | EntryKind::Trait(_) => {
1174 self.get_expn_that_defined(id, sess)
1176 _ => panic!("Expected module, found {:?}", self.local_def_id(id)),
1180 fn get_optimized_mir(self, tcx: TyCtxt<'tcx>, id: DefIndex) -> Body<'tcx> {
1185 .unwrap_or_else(|| {
1186 bug!("get_optimized_mir: missing MIR for `{:?}`", self.local_def_id(id))
1188 .decode((self, tcx))
1191 fn get_mir_for_ctfe(self, tcx: TyCtxt<'tcx>, id: DefIndex) -> Body<'tcx> {
1196 .unwrap_or_else(|| {
1197 bug!("get_mir_for_ctfe: missing MIR for `{:?}`", self.local_def_id(id))
1199 .decode((self, tcx))
1202 fn get_thir_abstract_const(
1206 ) -> Result<Option<&'tcx [thir::abstract_const::Node<'tcx>]>, ErrorReported> {
1209 .thir_abstract_consts
1211 .map_or(Ok(None), |v| Ok(Some(v.decode((self, tcx)))))
1214 fn get_unused_generic_params(self, id: DefIndex) -> FiniteBitSet<u32> {
1217 .unused_generic_params
1219 .map(|params| params.decode(self))
1220 .unwrap_or_default()
1223 fn get_promoted_mir(self, tcx: TyCtxt<'tcx>, id: DefIndex) -> IndexVec<Promoted, Body<'tcx>> {
1228 .unwrap_or_else(|| {
1229 bug!("get_promoted_mir: missing MIR for `{:?}`", self.local_def_id(id))
1231 .decode((self, tcx))
1234 fn mir_const_qualif(self, id: DefIndex) -> mir::ConstQualifs {
1235 match self.kind(id) {
1236 EntryKind::AnonConst(qualif, _)
1237 | EntryKind::Const(qualif, _)
1238 | EntryKind::AssocConst(
1239 AssocContainer::ImplDefault
1240 | AssocContainer::ImplFinal
1241 | AssocContainer::TraitWithDefault,
1245 _ => bug!("mir_const_qualif: unexpected kind"),
1249 fn get_fn_has_self_parameter(self, id: DefIndex) -> bool {
1250 match self.kind(id) {
1251 EntryKind::AssocFn(data) => data.decode(self).has_self,
1256 fn get_associated_item_def_ids(self, tcx: TyCtxt<'tcx>, id: DefIndex) -> &'tcx [DefId] {
1257 if let Some(children) = self.root.tables.children.get(self, id) {
1258 tcx.arena.alloc_from_iter(
1259 children.decode((self, tcx.sess)).map(|child_index| self.local_def_id(child_index)),
1266 fn get_associated_item(self, id: DefIndex, sess: &Session) -> ty::AssocItem {
1267 let def_key = self.def_key(id);
1268 let parent = self.local_def_id(def_key.parent.unwrap());
1269 let ident = self.item_ident(id, sess);
1271 let (kind, container, has_self) = match self.kind(id) {
1272 EntryKind::AssocConst(container, _, _) => (ty::AssocKind::Const, container, false),
1273 EntryKind::AssocFn(data) => {
1274 let data = data.decode(self);
1275 (ty::AssocKind::Fn, data.container, data.has_self)
1277 EntryKind::AssocType(container) => (ty::AssocKind::Type, container, false),
1278 _ => bug!("cannot get associated-item of `{:?}`", def_key),
1284 vis: self.get_visibility(id),
1285 defaultness: container.defaultness(),
1286 def_id: self.local_def_id(id),
1287 trait_item_def_id: self.get_trait_item_def_id(id),
1288 container: container.with_def_id(parent),
1289 fn_has_self_parameter: has_self,
1293 fn get_item_variances(self, id: DefIndex) -> impl Iterator<Item = ty::Variance> + 'a {
1294 self.root.tables.variances.get(self, id).unwrap_or_else(Lazy::empty).decode(self)
1297 fn get_ctor_def_id_and_kind(self, node_id: DefIndex) -> Option<(DefId, CtorKind)> {
1298 match self.kind(node_id) {
1299 EntryKind::Struct(data, _) | EntryKind::Variant(data) => {
1300 let vdata = data.decode(self);
1301 vdata.ctor.map(|index| (self.local_def_id(index), vdata.ctor_kind))
1311 ) -> impl Iterator<Item = ast::Attribute> + 'a {
1316 .unwrap_or_else(|| {
1317 // Structure and variant constructors don't have any attributes encoded for them,
1318 // but we assume that someone passing a constructor ID actually wants to look at
1319 // the attributes on the corresponding struct or variant.
1320 let def_key = self.def_key(id);
1321 assert_eq!(def_key.disambiguated_data.data, DefPathData::Ctor);
1322 let parent_id = def_key.parent.expect("no parent for a constructor");
1326 .get(self, parent_id)
1327 .expect("no encoded attributes for a structure or variant")
1329 .decode((self, sess))
1332 fn get_struct_field_names(
1336 ) -> impl Iterator<Item = Spanned<Symbol>> + 'a {
1341 .unwrap_or_else(Lazy::empty)
1343 .map(move |index| respan(self.get_span(index, sess), self.item_ident(index, sess).name))
1346 fn get_struct_field_visibilities(self, id: DefIndex) -> impl Iterator<Item = Visibility> + 'a {
1351 .unwrap_or_else(Lazy::empty)
1353 .map(move |field_index| self.get_visibility(field_index))
1356 fn get_inherent_implementations_for_type(
1360 ) -> &'tcx [DefId] {
1361 tcx.arena.alloc_from_iter(
1366 .unwrap_or_else(Lazy::empty)
1368 .map(|index| self.local_def_id(index)),
1372 fn get_traits(self) -> impl Iterator<Item = DefId> + 'a {
1373 self.root.traits.decode(self).map(move |index| self.local_def_id(index))
1376 fn get_trait_impls(self) -> impl Iterator<Item = (DefId, DefId, Option<SimplifiedType>)> + 'a {
1377 self.cdata.trait_impls.iter().flat_map(move |((trait_cnum_raw, trait_index), impls)| {
1378 let trait_def_id = DefId {
1379 krate: self.cnum_map[CrateNum::from_u32(*trait_cnum_raw)],
1380 index: *trait_index,
1382 impls.decode(self).map(move |(impl_index, simplified_self_ty)| {
1383 (trait_def_id, self.local_def_id(impl_index), simplified_self_ty)
1388 fn get_implementations_of_trait(
1391 trait_def_id: DefId,
1392 ) -> &'tcx [(DefId, Option<SimplifiedType>)] {
1393 if self.trait_impls.is_empty() {
1397 // Do a reverse lookup beforehand to avoid touching the crate_num
1398 // hash map in the loop below.
1399 let key = match self.reverse_translate_def_id(trait_def_id) {
1400 Some(def_id) => (def_id.krate.as_u32(), def_id.index),
1404 if let Some(impls) = self.trait_impls.get(&key) {
1405 tcx.arena.alloc_from_iter(
1408 .map(|(idx, simplified_self_ty)| (self.local_def_id(idx), simplified_self_ty)),
1415 fn get_trait_of_item(self, id: DefIndex) -> Option<DefId> {
1416 let def_key = self.def_key(id);
1417 match def_key.disambiguated_data.data {
1418 DefPathData::TypeNs(..) | DefPathData::ValueNs(..) => (),
1419 // Not an associated item
1422 def_key.parent.and_then(|parent_index| match self.kind(parent_index) {
1423 EntryKind::Trait(_) | EntryKind::TraitAlias => Some(self.local_def_id(parent_index)),
1428 fn get_native_libraries(self, sess: &'a Session) -> impl Iterator<Item = NativeLib> + 'a {
1429 self.root.native_libraries.decode((self, sess))
1432 fn get_proc_macro_quoted_span(self, index: usize, sess: &Session) -> Span {
1435 .proc_macro_quoted_spans
1437 .unwrap_or_else(|| panic!("Missing proc macro quoted span: {:?}", index))
1438 .decode((self, sess))
1441 fn get_foreign_modules(self, sess: &'a Session) -> impl Iterator<Item = ForeignModule> + '_ {
1442 self.root.foreign_modules.decode((self, sess))
1445 fn get_dylib_dependency_formats(
1448 ) -> &'tcx [(CrateNum, LinkagePreference)] {
1449 tcx.arena.alloc_from_iter(
1450 self.root.dylib_dependency_formats.decode(self).enumerate().flat_map(|(i, link)| {
1451 let cnum = CrateNum::new(i + 1);
1452 link.map(|link| (self.cnum_map[cnum], link))
1457 fn get_missing_lang_items(self, tcx: TyCtxt<'tcx>) -> &'tcx [lang_items::LangItem] {
1458 tcx.arena.alloc_from_iter(self.root.lang_items_missing.decode(self))
1461 fn get_fn_param_names(self, tcx: TyCtxt<'tcx>, id: DefIndex) -> &'tcx [Ident] {
1462 let param_names = match self.kind(id) {
1463 EntryKind::Fn(data) | EntryKind::ForeignFn(data) => data.decode(self).param_names,
1464 EntryKind::AssocFn(data) => data.decode(self).fn_data.param_names,
1467 tcx.arena.alloc_from_iter(param_names.decode((self, tcx)))
1470 fn exported_symbols(
1473 ) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportLevel)] {
1474 tcx.arena.alloc_from_iter(self.root.exported_symbols.decode((self, tcx)))
1477 fn get_rendered_const(self, id: DefIndex) -> String {
1478 match self.kind(id) {
1479 EntryKind::AnonConst(_, data)
1480 | EntryKind::Const(_, data)
1481 | EntryKind::AssocConst(_, _, data) => data.decode(self).0,
1486 fn get_macro(self, id: DefIndex, sess: &Session) -> MacroDef {
1487 match self.kind(id) {
1488 EntryKind::MacroDef(macro_def) => macro_def.decode((self, sess)),
1493 // This replicates some of the logic of the crate-local `is_const_fn_raw` query, because we
1494 // don't serialize constness for tuple variant and tuple struct constructors.
1495 fn is_const_fn_raw(self, id: DefIndex) -> bool {
1496 let constness = match self.kind(id) {
1497 EntryKind::AssocFn(data) => data.decode(self).fn_data.constness,
1498 EntryKind::Fn(data) => data.decode(self).constness,
1499 EntryKind::ForeignFn(data) => data.decode(self).constness,
1500 EntryKind::Variant(..) | EntryKind::Struct(..) => hir::Constness::Const,
1501 _ => hir::Constness::NotConst,
1503 constness == hir::Constness::Const
1506 fn asyncness(self, id: DefIndex) -> hir::IsAsync {
1507 match self.kind(id) {
1508 EntryKind::Fn(data) => data.decode(self).asyncness,
1509 EntryKind::AssocFn(data) => data.decode(self).fn_data.asyncness,
1510 EntryKind::ForeignFn(data) => data.decode(self).asyncness,
1511 _ => bug!("asyncness: expected function kind"),
1515 fn is_foreign_item(self, id: DefIndex) -> bool {
1516 match self.kind(id) {
1517 EntryKind::ForeignImmStatic | EntryKind::ForeignMutStatic | EntryKind::ForeignFn(_) => {
1524 fn static_mutability(self, id: DefIndex) -> Option<hir::Mutability> {
1525 match self.kind(id) {
1526 EntryKind::ImmStatic | EntryKind::ForeignImmStatic => Some(hir::Mutability::Not),
1527 EntryKind::MutStatic | EntryKind::ForeignMutStatic => Some(hir::Mutability::Mut),
1532 fn generator_kind(self, id: DefIndex) -> Option<hir::GeneratorKind> {
1533 match self.kind(id) {
1534 EntryKind::Generator(data) => Some(data),
1539 fn fn_sig(self, id: DefIndex, tcx: TyCtxt<'tcx>) -> ty::PolyFnSig<'tcx> {
1540 self.root.tables.fn_sig.get(self, id).unwrap().decode((self, tcx))
1544 fn def_key(self, index: DefIndex) -> DefKey {
1549 .or_insert_with(|| self.root.tables.def_keys.get(self, index).unwrap().decode(self))
1552 // Returns the path leading to the thing with this `id`.
1553 fn def_path(self, id: DefIndex) -> DefPath {
1554 debug!("def_path(cnum={:?}, id={:?})", self.cnum, id);
1555 DefPath::make(self.cnum, id, |parent| self.def_key(parent))
1558 fn def_path_hash_unlocked(
1561 def_path_hashes: &mut FxHashMap<DefIndex, DefPathHash>,
1563 *def_path_hashes.entry(index).or_insert_with(|| {
1564 self.root.tables.def_path_hashes.get(self, index).unwrap().decode(self)
1569 fn def_path_hash(self, index: DefIndex) -> DefPathHash {
1570 let mut def_path_hashes = self.def_path_hash_cache.lock();
1571 self.def_path_hash_unlocked(index, &mut def_path_hashes)
1575 fn def_path_hash_to_def_index(self, hash: DefPathHash) -> DefIndex {
1576 self.def_path_hash_map.def_path_hash_to_def_index(&hash)
1579 fn expn_hash_to_expn_id(self, sess: &Session, index_guess: u32, hash: ExpnHash) -> ExpnId {
1580 debug_assert_eq!(ExpnId::from_hash(hash), None);
1581 let index_guess = ExpnIndex::from_u32(index_guess);
1582 let old_hash = self.root.expn_hashes.get(self, index_guess).map(|lazy| lazy.decode(self));
1584 let index = if old_hash == Some(hash) {
1585 // Fast path: the expn and its index is unchanged from the
1586 // previous compilation session. There is no need to decode anything
1590 // Slow path: We need to find out the new `DefIndex` of the provided
1591 // `DefPathHash`, if its still exists. This requires decoding every `DefPathHash`
1592 // stored in this crate.
1593 let map = self.cdata.expn_hash_map.get_or_init(|| {
1594 let end_id = self.root.expn_hashes.size() as u32;
1596 UnhashMap::with_capacity_and_hasher(end_id as usize, Default::default());
1597 for i in 0..end_id {
1598 let i = ExpnIndex::from_u32(i);
1599 if let Some(hash) = self.root.expn_hashes.get(self, i) {
1600 map.insert(hash.decode(self), i);
1608 let data = self.root.expn_data.get(self, index).unwrap().decode((self, sess));
1609 rustc_span::hygiene::register_expn_id(self.cnum, index, data, hash)
1612 /// Imports the source_map from an external crate into the source_map of the crate
1613 /// currently being compiled (the "local crate").
1615 /// The import algorithm works analogous to how AST items are inlined from an
1616 /// external crate's metadata:
1617 /// For every SourceFile in the external source_map an 'inline' copy is created in the
1618 /// local source_map. The correspondence relation between external and local
1619 /// SourceFiles is recorded in the `ImportedSourceFile` objects returned from this
1620 /// function. When an item from an external crate is later inlined into this
1621 /// crate, this correspondence information is used to translate the span
1622 /// information of the inlined item so that it refers the correct positions in
1623 /// the local source_map (see `<decoder::DecodeContext as SpecializedDecoder<Span>>`).
1625 /// The import algorithm in the function below will reuse SourceFiles already
1626 /// existing in the local source_map. For example, even if the SourceFile of some
1627 /// source file of libstd gets imported many times, there will only ever be
1628 /// one SourceFile object for the corresponding file in the local source_map.
1630 /// Note that imported SourceFiles do not actually contain the source code of the
1631 /// file they represent, just information about length, line breaks, and
1632 /// multibyte characters. This information is enough to generate valid debuginfo
1633 /// for items inlined from other crates.
1635 /// Proc macro crates don't currently export spans, so this function does not have
1636 /// to work for them.
1637 fn imported_source_files(self, sess: &Session) -> &'a [ImportedSourceFile] {
1638 // Translate the virtual `/rustc/$hash` prefix back to a real directory
1639 // that should hold actual sources, where possible.
1641 // NOTE: if you update this, you might need to also update bootstrap's code for generating
1642 // the `rust-src` component in `Src::run` in `src/bootstrap/dist.rs`.
1643 let virtual_rust_source_base_dir = option_env!("CFG_VIRTUAL_RUST_SOURCE_BASE_DIR")
1646 // Only spend time on further checks if we have what to translate *to*.
1647 sess.opts.real_rust_source_base_dir.is_some()
1649 .filter(|virtual_dir| {
1650 // Don't translate away `/rustc/$hash` if we're still remapping to it,
1651 // since that means we're still building `std`/`rustc` that need it,
1652 // and we don't want the real path to leak into codegen/debuginfo.
1653 !sess.opts.remap_path_prefix.iter().any(|(_from, to)| to == virtual_dir)
1655 let try_to_translate_virtual_to_real = |name: &mut rustc_span::FileName| {
1657 "try_to_translate_virtual_to_real(name={:?}): \
1658 virtual_rust_source_base_dir={:?}, real_rust_source_base_dir={:?}",
1659 name, virtual_rust_source_base_dir, sess.opts.real_rust_source_base_dir,
1662 if let Some(virtual_dir) = virtual_rust_source_base_dir {
1663 if let Some(real_dir) = &sess.opts.real_rust_source_base_dir {
1664 if let rustc_span::FileName::Real(old_name) = name {
1665 if let rustc_span::RealFileName::Remapped { local_path: _, virtual_name } =
1668 if let Ok(rest) = virtual_name.strip_prefix(virtual_dir) {
1669 let virtual_name = virtual_name.clone();
1671 // The std library crates are in
1672 // `$sysroot/lib/rustlib/src/rust/library`, whereas other crates
1673 // may be in `$sysroot/lib/rustlib/src/rust/` directly. So we
1674 // detect crates from the std libs and handle them specially.
1675 const STD_LIBS: &[&str] = &[
1685 "profiler_builtins",
1687 "rustc-std-workspace-core",
1688 "rustc-std-workspace-alloc",
1689 "rustc-std-workspace-std",
1692 let is_std_lib = STD_LIBS.iter().any(|l| rest.starts_with(l));
1694 let new_path = if is_std_lib {
1695 real_dir.join("library").join(rest)
1701 "try_to_translate_virtual_to_real: `{}` -> `{}`",
1702 virtual_name.display(),
1705 let new_name = rustc_span::RealFileName::Remapped {
1706 local_path: Some(new_path),
1709 *old_name = new_name;
1717 self.cdata.source_map_import_info.get_or_init(|| {
1718 let external_source_map = self.root.source_map.decode(self);
1721 .map(|source_file_to_import| {
1722 // We can't reuse an existing SourceFile, so allocate a new one
1723 // containing the information we need.
1724 let rustc_span::SourceFile {
1730 mut multibyte_chars,
1731 mut non_narrow_chars,
1735 } = source_file_to_import;
1737 // If this file is under $sysroot/lib/rustlib/src/ but has not been remapped
1738 // during rust bootstrapping by `remap-debuginfo = true`, and the user
1739 // wish to simulate that behaviour by -Z simulate-remapped-rust-src-base,
1740 // then we change `name` to a similar state as if the rust was bootstrapped
1741 // with `remap-debuginfo = true`.
1742 // This is useful for testing so that tests about the effects of
1743 // `try_to_translate_virtual_to_real` don't have to worry about how the
1744 // compiler is bootstrapped.
1745 if let Some(virtual_dir) =
1746 &sess.opts.debugging_opts.simulate_remapped_rust_src_base
1748 if let Some(real_dir) = &sess.opts.real_rust_source_base_dir {
1749 if let rustc_span::FileName::Real(ref mut old_name) = name {
1750 if let rustc_span::RealFileName::LocalPath(local) = old_name {
1751 if let Ok(rest) = local.strip_prefix(real_dir) {
1752 *old_name = rustc_span::RealFileName::Remapped {
1754 virtual_name: virtual_dir.join(rest),
1762 // If this file's path has been remapped to `/rustc/$hash`,
1763 // we might be able to reverse that (also see comments above,
1764 // on `try_to_translate_virtual_to_real`).
1765 try_to_translate_virtual_to_real(&mut name);
1767 let source_length = (end_pos - start_pos).to_usize();
1769 // Translate line-start positions and multibyte character
1770 // position into frame of reference local to file.
1771 // `SourceMap::new_imported_source_file()` will then translate those
1772 // coordinates to their new global frame of reference when the
1773 // offset of the SourceFile is known.
1774 for pos in &mut lines {
1775 *pos = *pos - start_pos;
1777 for mbc in &mut multibyte_chars {
1778 mbc.pos = mbc.pos - start_pos;
1780 for swc in &mut non_narrow_chars {
1781 *swc = *swc - start_pos;
1783 for np in &mut normalized_pos {
1784 np.pos = np.pos - start_pos;
1787 let local_version = sess.source_map().new_imported_source_file(
1801 "CrateMetaData::imported_source_files alloc \
1802 source_file {:?} original (start_pos {:?} end_pos {:?}) \
1803 translated (start_pos {:?} end_pos {:?})",
1807 local_version.start_pos,
1808 local_version.end_pos
1811 ImportedSourceFile {
1812 original_start_pos: start_pos,
1813 original_end_pos: end_pos,
1814 translated_source_file: local_version,
1822 impl CrateMetadata {
1826 root: CrateRoot<'static>,
1827 raw_proc_macros: Option<&'static [ProcMacro]>,
1829 cnum_map: CrateNumMap,
1830 dep_kind: CrateDepKind,
1831 source: CrateSource,
1833 host_hash: Option<Svh>,
1834 ) -> CrateMetadata {
1835 let trait_impls = root
1837 .decode((&blob, sess))
1838 .map(|trait_impls| (trait_impls.trait_id, trait_impls.impls))
1840 let alloc_decoding_state =
1841 AllocDecodingState::new(root.interpret_alloc_index.decode(&blob).collect());
1842 let dependencies = Lock::new(cnum_map.iter().cloned().collect());
1844 // Pre-decode the DefPathHash->DefIndex table. This is a cheap operation
1845 // that does not copy any data. It just does some data verification.
1846 let def_path_hash_map = root.def_path_hash_map.decode(&blob);
1853 source_map_import_info: OnceCell::new(),
1855 expn_hash_map: Default::default(),
1856 alloc_decoding_state,
1860 dep_kind: Lock::new(dep_kind),
1864 extern_crate: Lock::new(None),
1865 hygiene_context: Default::default(),
1866 def_key_cache: Default::default(),
1867 def_path_hash_cache: Default::default(),
1871 crate fn dependencies(&self) -> LockGuard<'_, Vec<CrateNum>> {
1872 self.dependencies.borrow()
1875 crate fn add_dependency(&self, cnum: CrateNum) {
1876 self.dependencies.borrow_mut().push(cnum);
1879 crate fn update_extern_crate(&self, new_extern_crate: ExternCrate) -> bool {
1880 let mut extern_crate = self.extern_crate.borrow_mut();
1881 let update = Some(new_extern_crate.rank()) > extern_crate.as_ref().map(ExternCrate::rank);
1883 *extern_crate = Some(new_extern_crate);
1888 crate fn source(&self) -> &CrateSource {
1892 crate fn dep_kind(&self) -> CrateDepKind {
1893 *self.dep_kind.lock()
1896 crate fn update_dep_kind(&self, f: impl FnOnce(CrateDepKind) -> CrateDepKind) {
1897 self.dep_kind.with_lock(|dep_kind| *dep_kind = f(*dep_kind))
1900 crate fn panic_strategy(&self) -> PanicStrategy {
1901 self.root.panic_strategy
1904 crate fn needs_panic_runtime(&self) -> bool {
1905 self.root.needs_panic_runtime
1908 crate fn is_panic_runtime(&self) -> bool {
1909 self.root.panic_runtime
1912 crate fn is_profiler_runtime(&self) -> bool {
1913 self.root.profiler_runtime
1916 crate fn needs_allocator(&self) -> bool {
1917 self.root.needs_allocator
1920 crate fn has_global_allocator(&self) -> bool {
1921 self.root.has_global_allocator
1924 crate fn has_default_lib_allocator(&self) -> bool {
1925 self.root.has_default_lib_allocator
1928 crate fn is_proc_macro_crate(&self) -> bool {
1929 self.root.is_proc_macro_crate()
1932 crate fn name(&self) -> Symbol {
1936 crate fn stable_crate_id(&self) -> StableCrateId {
1937 self.root.stable_crate_id
1940 crate fn hash(&self) -> Svh {
1944 fn num_def_ids(&self) -> usize {
1945 self.root.tables.def_keys.size()
1948 fn local_def_id(&self, index: DefIndex) -> DefId {
1949 DefId { krate: self.cnum, index }
1952 // Translate a DefId from the current compilation environment to a DefId
1953 // for an external crate.
1954 fn reverse_translate_def_id(&self, did: DefId) -> Option<DefId> {
1955 for (local, &global) in self.cnum_map.iter_enumerated() {
1956 if global == did.krate {
1957 return Some(DefId { krate: local, index: did.index });
1965 // Cannot be implemented on 'ProcMacro', as libproc_macro
1966 // does not depend on librustc_ast
1967 fn macro_kind(raw: &ProcMacro) -> MacroKind {
1969 ProcMacro::CustomDerive { .. } => MacroKind::Derive,
1970 ProcMacro::Attr { .. } => MacroKind::Attr,
1971 ProcMacro::Bang { .. } => MacroKind::Bang,