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::fingerprint::{Fingerprint, FingerprintDecoder};
11 use rustc_data_structures::fx::FxHashMap;
12 use rustc_data_structures::svh::Svh;
13 use rustc_data_structures::sync::{AtomicCell, Lock, LockGuard, Lrc, OnceCell};
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::lang_items;
22 use rustc_index::vec::{Idx, IndexVec};
23 use rustc_middle::dep_graph::{self, DepNode, DepNodeExt, DepNodeIndex};
24 use rustc_middle::hir::exports::Export;
25 use rustc_middle::middle::cstore::{CrateSource, ExternCrate};
26 use rustc_middle::middle::cstore::{ForeignModule, LinkagePreference, NativeLib};
27 use rustc_middle::middle::exported_symbols::{ExportedSymbol, SymbolExportLevel};
28 use rustc_middle::mir::interpret::{AllocDecodingSession, AllocDecodingState};
29 use rustc_middle::mir::{self, Body, Promoted};
30 use rustc_middle::ty::codec::TyDecoder;
31 use rustc_middle::ty::{self, Ty, TyCtxt};
32 use rustc_serialize::{opaque, Decodable, Decoder};
33 use rustc_session::Session;
34 use rustc_span::hygiene::ExpnDataDecodeMode;
35 use rustc_span::source_map::{respan, Spanned};
36 use rustc_span::symbol::{sym, Ident, Symbol};
37 use rustc_span::{self, hygiene::MacroKind, BytePos, ExpnId, Pos, Span, SyntaxContext, DUMMY_SP};
39 use proc_macro::bridge::client::ProcMacro;
43 use std::num::NonZeroUsize;
47 pub use cstore_impl::{provide, provide_extern};
48 use rustc_span::hygiene::HygieneDecodeContext;
52 crate struct MetadataBlob(MetadataRef);
54 // A map from external crate numbers (as decoded from some crate file) to
55 // local crate numbers (as generated during this session). Each external
56 // crate may refer to types in other external crates, and each has their
58 crate type CrateNumMap = IndexVec<CrateNum, CrateNum>;
60 crate struct CrateMetadata {
61 /// The primary crate data - binary metadata blob.
64 // --- Some data pre-decoded from the metadata blob, usually for performance ---
65 /// Properties of the whole crate.
66 /// NOTE(eddyb) we pass `'static` to a `'tcx` parameter because this
67 /// lifetime is only used behind `Lazy`, and therefore acts like an
68 /// universal (`for<'tcx>`), that is paired up with whichever `TyCtxt`
69 /// is being used to decode those values.
70 root: CrateRoot<'static>,
72 /// FIXME: Used only from queries and can use query cache,
73 /// so pre-decoding can probably be avoided.
75 FxHashMap<(u32, DefIndex), Lazy<[(DefIndex, Option<ty::fast_reject::SimplifiedType>)]>>,
76 /// Proc macro descriptions for this crate, if it's a proc macro crate.
77 raw_proc_macros: Option<&'static [ProcMacro]>,
78 /// Source maps for code from the crate.
79 source_map_import_info: OnceCell<Vec<ImportedSourceFile>>,
80 /// Used for decoding interpret::AllocIds in a cached & thread-safe manner.
81 alloc_decoding_state: AllocDecodingState,
82 /// The `DepNodeIndex` of the `DepNode` representing this upstream crate.
83 /// It is initialized on the first access in `get_crate_dep_node_index()`.
84 /// Do not access the value directly, as it might not have been initialized yet.
85 /// The field must always be initialized to `DepNodeIndex::INVALID`.
86 dep_node_index: AtomicCell<DepNodeIndex>,
87 /// Caches decoded `DefKey`s.
88 def_key_cache: Lock<FxHashMap<DefIndex, DefKey>>,
89 /// Caches decoded `DefPathHash`es.
90 def_path_hash_cache: Lock<FxHashMap<DefIndex, DefPathHash>>,
92 // --- Other significant crate properties ---
93 /// ID of this crate, from the current compilation session's point of view.
95 /// Maps crate IDs as they are were seen from this crate's compilation sessions into
96 /// IDs as they are seen from the current compilation session.
97 cnum_map: CrateNumMap,
98 /// Same ID set as `cnum_map` plus maybe some injected crates like panic runtime.
99 dependencies: Lock<Vec<CrateNum>>,
100 /// How to link (or not link) this crate to the currently compiled crate.
101 dep_kind: Lock<CrateDepKind>,
102 /// Filesystem location of this crate.
104 /// Whether or not this crate should be consider a private dependency
105 /// for purposes of the 'exported_private_dependencies' lint
107 /// The hash for the host proc macro. Used to support `-Z dual-proc-macro`.
108 host_hash: Option<Svh>,
110 /// Additional data used for decoding `HygieneData` (e.g. `SyntaxContext`
112 /// Note that we store a `HygieneDecodeContext` for each `CrateMetadat`. This is
113 /// because `SyntaxContext` ids are not globally unique, so we need
114 /// to track which ids we've decoded on a per-crate basis.
115 hygiene_context: HygieneDecodeContext,
117 // --- Data used only for improving diagnostics ---
118 /// Information about the `extern crate` item or path that caused this crate to be loaded.
119 /// If this is `None`, then the crate was injected (e.g., by the allocator).
120 extern_crate: Lock<Option<ExternCrate>>,
123 /// Holds information about a rustc_span::SourceFile imported from another crate.
124 /// See `imported_source_files()` for more information.
125 struct ImportedSourceFile {
126 /// This SourceFile's byte-offset within the source_map of its original crate
127 original_start_pos: rustc_span::BytePos,
128 /// The end of this SourceFile within the source_map of its original crate
129 original_end_pos: rustc_span::BytePos,
130 /// The imported SourceFile's representation within the local source_map
131 translated_source_file: Lrc<rustc_span::SourceFile>,
134 pub(super) struct DecodeContext<'a, 'tcx> {
135 opaque: opaque::Decoder<'a>,
136 cdata: Option<CrateMetadataRef<'a>>,
137 sess: Option<&'tcx Session>,
138 tcx: Option<TyCtxt<'tcx>>,
140 // Cache the last used source_file for translating spans as an optimization.
141 last_source_file_index: usize,
143 lazy_state: LazyState,
145 // Used for decoding interpret::AllocIds in a cached & thread-safe manner.
146 alloc_decoding_session: Option<AllocDecodingSession<'a>>,
149 /// Abstract over the various ways one can create metadata decoders.
150 pub(super) trait Metadata<'a, 'tcx>: Copy {
151 fn raw_bytes(self) -> &'a [u8];
152 fn cdata(self) -> Option<CrateMetadataRef<'a>> {
155 fn sess(self) -> Option<&'tcx Session> {
158 fn tcx(self) -> Option<TyCtxt<'tcx>> {
162 fn decoder(self, pos: usize) -> DecodeContext<'a, 'tcx> {
163 let tcx = self.tcx();
165 opaque: opaque::Decoder::new(self.raw_bytes(), pos),
167 sess: self.sess().or(tcx.map(|tcx| tcx.sess)),
169 last_source_file_index: 0,
170 lazy_state: LazyState::NoNode,
171 alloc_decoding_session: self
173 .map(|cdata| cdata.cdata.alloc_decoding_state.new_decoding_session()),
178 impl<'a, 'tcx> Metadata<'a, 'tcx> for &'a MetadataBlob {
179 fn raw_bytes(self) -> &'a [u8] {
184 impl<'a, 'tcx> Metadata<'a, 'tcx> for (&'a MetadataBlob, &'tcx Session) {
185 fn raw_bytes(self) -> &'a [u8] {
186 let (blob, _) = self;
190 fn sess(self) -> Option<&'tcx Session> {
191 let (_, sess) = self;
196 impl<'a, 'tcx> Metadata<'a, 'tcx> for &'a CrateMetadataRef<'a> {
197 fn raw_bytes(self) -> &'a [u8] {
198 self.blob.raw_bytes()
200 fn cdata(self) -> Option<CrateMetadataRef<'a>> {
205 impl<'a, 'tcx> Metadata<'a, 'tcx> for (&'a CrateMetadataRef<'a>, &'tcx Session) {
206 fn raw_bytes(self) -> &'a [u8] {
209 fn cdata(self) -> Option<CrateMetadataRef<'a>> {
212 fn sess(self) -> Option<&'tcx Session> {
217 impl<'a, 'tcx> Metadata<'a, 'tcx> for (&'a CrateMetadataRef<'a>, TyCtxt<'tcx>) {
218 fn raw_bytes(self) -> &'a [u8] {
221 fn cdata(self) -> Option<CrateMetadataRef<'a>> {
224 fn tcx(self) -> Option<TyCtxt<'tcx>> {
229 impl<'a, 'tcx, T: Decodable<DecodeContext<'a, 'tcx>>> Lazy<T> {
230 fn decode<M: Metadata<'a, 'tcx>>(self, metadata: M) -> T {
231 let mut dcx = metadata.decoder(self.position.get());
232 dcx.lazy_state = LazyState::NodeStart(self.position);
233 T::decode(&mut dcx).unwrap()
237 impl<'a: 'x, 'tcx: 'x, 'x, T: Decodable<DecodeContext<'a, 'tcx>>> Lazy<[T]> {
238 fn decode<M: Metadata<'a, 'tcx>>(
241 ) -> impl ExactSizeIterator<Item = T> + Captures<'a> + Captures<'tcx> + 'x {
242 let mut dcx = metadata.decoder(self.position.get());
243 dcx.lazy_state = LazyState::NodeStart(self.position);
244 (0..self.meta).map(move |_| T::decode(&mut dcx).unwrap())
248 impl<'a, 'tcx> DecodeContext<'a, 'tcx> {
249 fn tcx(&self) -> TyCtxt<'tcx> {
250 self.tcx.expect("missing TyCtxt in DecodeContext")
253 fn cdata(&self) -> CrateMetadataRef<'a> {
254 self.cdata.expect("missing CrateMetadata in DecodeContext")
257 fn read_lazy_with_meta<T: ?Sized + LazyMeta>(
260 ) -> Result<Lazy<T>, <Self as Decoder>::Error> {
261 let min_size = T::min_size(meta);
262 let distance = self.read_usize()?;
263 let position = match self.lazy_state {
264 LazyState::NoNode => bug!("read_lazy_with_meta: outside of a metadata node"),
265 LazyState::NodeStart(start) => {
266 let start = start.get();
267 assert!(distance + min_size <= start);
268 start - distance - min_size
270 LazyState::Previous(last_min_end) => last_min_end.get() + distance,
272 self.lazy_state = LazyState::Previous(NonZeroUsize::new(position + min_size).unwrap());
273 Ok(Lazy::from_position_and_meta(NonZeroUsize::new(position).unwrap(), meta))
277 impl<'a, 'tcx> TyDecoder<'tcx> for DecodeContext<'a, 'tcx> {
278 const CLEAR_CROSS_CRATE: bool = true;
281 fn tcx(&self) -> TyCtxt<'tcx> {
282 self.tcx.expect("missing TyCtxt in DecodeContext")
286 fn peek_byte(&self) -> u8 {
287 self.opaque.data[self.opaque.position()]
291 fn position(&self) -> usize {
292 self.opaque.position()
295 fn cached_ty_for_shorthand<F>(
299 ) -> Result<Ty<'tcx>, Self::Error>
301 F: FnOnce(&mut Self) -> Result<Ty<'tcx>, Self::Error>,
303 let tcx = self.tcx();
305 let key = ty::CReaderCacheKey { cnum: self.cdata().cnum, pos: shorthand };
307 if let Some(&ty) = tcx.ty_rcache.borrow().get(&key) {
311 let ty = or_insert_with(self)?;
312 tcx.ty_rcache.borrow_mut().insert(key, ty);
316 fn cached_predicate_for_shorthand<F>(
320 ) -> Result<ty::Predicate<'tcx>, Self::Error>
322 F: FnOnce(&mut Self) -> Result<ty::Predicate<'tcx>, Self::Error>,
324 let tcx = self.tcx();
326 let key = ty::CReaderCacheKey { cnum: self.cdata().cnum, pos: shorthand };
328 if let Some(&pred) = tcx.pred_rcache.borrow().get(&key) {
332 let pred = or_insert_with(self)?;
333 tcx.pred_rcache.borrow_mut().insert(key, pred);
337 fn with_position<F, R>(&mut self, pos: usize, f: F) -> R
339 F: FnOnce(&mut Self) -> R,
341 let new_opaque = opaque::Decoder::new(self.opaque.data, pos);
342 let old_opaque = mem::replace(&mut self.opaque, new_opaque);
343 let old_state = mem::replace(&mut self.lazy_state, LazyState::NoNode);
345 self.opaque = old_opaque;
346 self.lazy_state = old_state;
350 fn map_encoded_cnum_to_current(&self, cnum: CrateNum) -> CrateNum {
351 if cnum == LOCAL_CRATE { self.cdata().cnum } else { self.cdata().cnum_map[cnum] }
354 fn decode_alloc_id(&mut self) -> Result<rustc_middle::mir::interpret::AllocId, Self::Error> {
355 if let Some(alloc_decoding_session) = self.alloc_decoding_session {
356 alloc_decoding_session.decode_alloc_id(self)
358 bug!("Attempting to decode interpret::AllocId without CrateMetadata")
363 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for CrateNum {
364 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> Result<CrateNum, String> {
365 let cnum = CrateNum::from_u32(d.read_u32()?);
366 Ok(d.map_encoded_cnum_to_current(cnum))
370 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for DefIndex {
371 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> Result<DefIndex, String> {
372 Ok(DefIndex::from_u32(d.read_u32()?))
376 impl<'a, 'tcx> FingerprintDecoder for DecodeContext<'a, 'tcx> {
377 fn decode_fingerprint(&mut self) -> Result<Fingerprint, String> {
378 Fingerprint::decode_opaque(&mut self.opaque)
382 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for SyntaxContext {
383 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Result<SyntaxContext, String> {
384 let cdata = decoder.cdata();
385 let sess = decoder.sess.unwrap();
386 let cname = cdata.root.name;
387 rustc_span::hygiene::decode_syntax_context(decoder, &cdata.hygiene_context, |_, id| {
388 debug!("SpecializedDecoder<SyntaxContext>: decoding {}", id);
393 .unwrap_or_else(|| panic!("Missing SyntaxContext {:?} for crate {:?}", id, cname))
394 .decode((&cdata, sess)))
399 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for ExpnId {
400 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Result<ExpnId, String> {
401 let local_cdata = decoder.cdata();
402 let sess = decoder.sess.unwrap();
403 let expn_cnum = Cell::new(None);
404 let get_ctxt = |cnum| {
405 expn_cnum.set(Some(cnum));
406 if cnum == LOCAL_CRATE {
407 &local_cdata.hygiene_context
409 &local_cdata.cstore.get_crate_data(cnum).cdata.hygiene_context
413 rustc_span::hygiene::decode_expn_id(
415 ExpnDataDecodeMode::Metadata(get_ctxt),
417 let cnum = expn_cnum.get().unwrap();
418 // Lookup local `ExpnData`s in our own crate data. Foreign `ExpnData`s
419 // are stored in the owning crate, to avoid duplication.
420 let crate_data = if cnum == LOCAL_CRATE {
423 local_cdata.cstore.get_crate_data(cnum)
428 .get(&crate_data, index)
430 .decode((&crate_data, sess)))
436 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for Span {
437 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Result<Span, String> {
438 let tag = u8::decode(decoder)?;
440 if tag == TAG_INVALID_SPAN {
444 debug_assert!(tag == TAG_VALID_SPAN_LOCAL || tag == TAG_VALID_SPAN_FOREIGN);
446 let lo = BytePos::decode(decoder)?;
447 let len = BytePos::decode(decoder)?;
448 let ctxt = SyntaxContext::decode(decoder)?;
451 let sess = if let Some(sess) = decoder.sess {
454 bug!("Cannot decode Span without Session.")
457 // There are two possibilities here:
458 // 1. This is a 'local span', which is located inside a `SourceFile`
459 // that came from this crate. In this case, we use the source map data
460 // encoded in this crate. This branch should be taken nearly all of the time.
461 // 2. This is a 'foreign span', which is located inside a `SourceFile`
462 // that came from a *different* crate (some crate upstream of the one
463 // whose metadata we're looking at). For example, consider this dependency graph:
467 // Suppose that we're currently compiling crate A, and start deserializing
468 // metadata from crate B. When we deserialize a Span from crate B's metadata,
469 // there are two posibilites:
471 // 1. The span references a file from crate B. This makes it a 'local' span,
472 // which means that we can use crate B's serialized source map information.
473 // 2. The span references a file from crate C. This makes it a 'foreign' span,
474 // which means we need to use Crate *C* (not crate B) to determine the source
475 // map information. We only record source map information for a file in the
476 // crate that 'owns' it, so deserializing a Span may require us to look at
477 // a transitive dependency.
479 // When we encode a foreign span, we adjust its 'lo' and 'high' values
480 // to be based on the *foreign* crate (e.g. crate C), not the crate
481 // we are writing metadata for (e.g. crate B). This allows us to
482 // treat the 'local' and 'foreign' cases almost identically during deserialization:
483 // we can call `imported_source_files` for the proper crate, and binary search
484 // through the returned slice using our span.
485 let imported_source_files = if tag == TAG_VALID_SPAN_LOCAL {
486 decoder.cdata().imported_source_files(sess)
488 // When we encode a proc-macro crate, all `Span`s should be encoded
489 // with `TAG_VALID_SPAN_LOCAL`
490 if decoder.cdata().root.is_proc_macro_crate() {
491 // Decode `CrateNum` as u32 - using `CrateNum::decode` will ICE
492 // since we don't have `cnum_map` populated.
493 let cnum = u32::decode(decoder)?;
495 "Decoding of crate {:?} tried to access proc-macro dep {:?}",
496 decoder.cdata().root.name,
500 // tag is TAG_VALID_SPAN_FOREIGN, checked by `debug_assert` above
501 let cnum = CrateNum::decode(decoder)?;
503 "SpecializedDecoder<Span>::specialized_decode: loading source files from cnum {:?}",
507 // Decoding 'foreign' spans should be rare enough that it's
508 // not worth it to maintain a per-CrateNum cache for `last_source_file_index`.
509 // We just set it to 0, to ensure that we don't try to access something out
510 // of bounds for our initial 'guess'
511 decoder.last_source_file_index = 0;
513 let foreign_data = decoder.cdata().cstore.get_crate_data(cnum);
514 foreign_data.imported_source_files(sess)
518 // Optimize for the case that most spans within a translated item
519 // originate from the same source_file.
520 let last_source_file = &imported_source_files[decoder.last_source_file_index];
522 if lo >= last_source_file.original_start_pos && lo <= last_source_file.original_end_pos
526 let index = imported_source_files
527 .binary_search_by_key(&lo, |source_file| source_file.original_start_pos)
528 .unwrap_or_else(|index| index - 1);
530 // Don't try to cache the index for foreign spans,
531 // as this would require a map from CrateNums to indices
532 if tag == TAG_VALID_SPAN_LOCAL {
533 decoder.last_source_file_index = index;
535 &imported_source_files[index]
539 // Make sure our binary search above is correct.
541 lo >= source_file.original_start_pos && lo <= source_file.original_end_pos,
542 "Bad binary search: lo={:?} source_file.original_start_pos={:?} source_file.original_end_pos={:?}",
544 source_file.original_start_pos,
545 source_file.original_end_pos
548 // Make sure we correctly filtered out invalid spans during encoding
550 hi >= source_file.original_start_pos && hi <= source_file.original_end_pos,
551 "Bad binary search: hi={:?} source_file.original_start_pos={:?} source_file.original_end_pos={:?}",
553 source_file.original_start_pos,
554 source_file.original_end_pos
558 (lo + source_file.translated_source_file.start_pos) - source_file.original_start_pos;
560 (hi + source_file.translated_source_file.start_pos) - source_file.original_start_pos;
562 Ok(Span::new(lo, hi, ctxt))
566 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for &'tcx [mir::abstract_const::Node<'tcx>] {
567 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> Result<Self, String> {
568 ty::codec::RefDecodable::decode(d)
572 impl<'a, 'tcx> Decodable<DecodeContext<'a, 'tcx>> for &'tcx [(ty::Predicate<'tcx>, Span)] {
573 fn decode(d: &mut DecodeContext<'a, 'tcx>) -> Result<Self, String> {
574 ty::codec::RefDecodable::decode(d)
578 impl<'a, 'tcx, T: Decodable<DecodeContext<'a, 'tcx>>> Decodable<DecodeContext<'a, 'tcx>>
581 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Result<Self, String> {
582 decoder.read_lazy_with_meta(())
586 impl<'a, 'tcx, T: Decodable<DecodeContext<'a, 'tcx>>> Decodable<DecodeContext<'a, 'tcx>>
589 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Result<Self, String> {
590 let len = decoder.read_usize()?;
591 if len == 0 { Ok(Lazy::empty()) } else { decoder.read_lazy_with_meta(len) }
595 impl<'a, 'tcx, I: Idx, T: Decodable<DecodeContext<'a, 'tcx>>> Decodable<DecodeContext<'a, 'tcx>>
596 for Lazy<Table<I, T>>
598 Option<T>: FixedSizeEncoding,
600 fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Result<Self, String> {
601 let len = decoder.read_usize()?;
602 decoder.read_lazy_with_meta(len)
606 implement_ty_decoder!(DecodeContext<'a, 'tcx>);
609 crate fn new(metadata_ref: MetadataRef) -> MetadataBlob {
610 MetadataBlob(metadata_ref)
613 crate fn is_compatible(&self) -> bool {
614 self.raw_bytes().starts_with(METADATA_HEADER)
617 crate fn get_rustc_version(&self) -> String {
618 Lazy::<String>::from_position(NonZeroUsize::new(METADATA_HEADER.len() + 4).unwrap())
622 crate fn get_root(&self) -> CrateRoot<'tcx> {
623 let slice = self.raw_bytes();
624 let offset = METADATA_HEADER.len();
625 let pos = (((slice[offset + 0] as u32) << 24)
626 | ((slice[offset + 1] as u32) << 16)
627 | ((slice[offset + 2] as u32) << 8)
628 | ((slice[offset + 3] as u32) << 0)) as usize;
629 Lazy::<CrateRoot<'tcx>>::from_position(NonZeroUsize::new(pos).unwrap()).decode(self)
632 crate fn list_crate_metadata(&self, out: &mut dyn io::Write) -> io::Result<()> {
633 write!(out, "=External Dependencies=\n")?;
634 let root = self.get_root();
635 for (i, dep) in root.crate_deps.decode(self).enumerate() {
636 write!(out, "{} {}{}\n", i + 1, dep.name, dep.extra_filename)?;
644 fn def_kind(&self) -> DefKind {
646 EntryKind::AnonConst(..) => DefKind::AnonConst,
647 EntryKind::Const(..) => DefKind::Const,
648 EntryKind::AssocConst(..) => DefKind::AssocConst,
650 | EntryKind::MutStatic
651 | EntryKind::ForeignImmStatic
652 | EntryKind::ForeignMutStatic => DefKind::Static,
653 EntryKind::Struct(_, _) => DefKind::Struct,
654 EntryKind::Union(_, _) => DefKind::Union,
655 EntryKind::Fn(_) | EntryKind::ForeignFn(_) => DefKind::Fn,
656 EntryKind::AssocFn(_) => DefKind::AssocFn,
657 EntryKind::Type => DefKind::TyAlias,
658 EntryKind::TypeParam => DefKind::TyParam,
659 EntryKind::ConstParam => DefKind::ConstParam,
660 EntryKind::OpaqueTy => DefKind::OpaqueTy,
661 EntryKind::AssocType(_) => DefKind::AssocTy,
662 EntryKind::Mod(_) => DefKind::Mod,
663 EntryKind::Variant(_) => DefKind::Variant,
664 EntryKind::Trait(_) => DefKind::Trait,
665 EntryKind::TraitAlias => DefKind::TraitAlias,
666 EntryKind::Enum(..) => DefKind::Enum,
667 EntryKind::MacroDef(_) => DefKind::Macro(MacroKind::Bang),
668 EntryKind::ForeignType => DefKind::ForeignTy,
669 EntryKind::Impl(_) => DefKind::Impl,
670 EntryKind::Closure => DefKind::Closure,
671 EntryKind::ForeignMod => DefKind::ForeignMod,
672 EntryKind::GlobalAsm => DefKind::GlobalAsm,
673 EntryKind::Field => DefKind::Field,
674 EntryKind::Generator(_) => DefKind::Generator,
680 crate fn is_proc_macro_crate(&self) -> bool {
681 self.proc_macro_data.is_some()
684 crate fn name(&self) -> Symbol {
688 crate fn disambiguator(&self) -> CrateDisambiguator {
692 crate fn hash(&self) -> Svh {
696 crate fn triple(&self) -> &TargetTriple {
700 crate fn decode_crate_deps(
702 metadata: &'a MetadataBlob,
703 ) -> impl ExactSizeIterator<Item = CrateDep> + Captures<'a> {
704 self.crate_deps.decode(metadata)
708 impl<'a, 'tcx> CrateMetadataRef<'a> {
709 fn is_proc_macro(&self, id: DefIndex) -> bool {
713 .and_then(|data| data.macros.decode(self).find(|x| *x == id))
717 fn maybe_kind(&self, item_id: DefIndex) -> Option<EntryKind> {
718 self.root.tables.kind.get(self, item_id).map(|k| k.decode(self))
721 fn kind(&self, item_id: DefIndex) -> EntryKind {
722 assert!(!self.is_proc_macro(item_id));
723 self.maybe_kind(item_id).unwrap_or_else(|| {
725 "CrateMetadata::kind({:?}): id not found, in crate {:?} with number {}",
733 fn raw_proc_macro(&self, id: DefIndex) -> &ProcMacro {
734 // DefIndex's in root.proc_macro_data have a one-to-one correspondence
735 // with items in 'raw_proc_macros'.
743 .position(|i| i == id)
745 &self.raw_proc_macros.unwrap()[pos]
748 fn item_ident(&self, item_index: DefIndex, sess: &Session) -> Ident {
749 if !self.is_proc_macro(item_index) {
755 .expect("no name in item_ident");
760 .get(self, item_index)
761 .map(|data| data.decode((self, sess)))
762 .unwrap_or_else(|| panic!("Missing ident span for {:?} ({:?})", name, item_index));
763 Ident::new(name, span)
766 Symbol::intern(self.raw_proc_macro(item_index).name()),
767 self.get_span(item_index, sess),
772 fn def_kind(&self, index: DefIndex) -> DefKind {
773 if !self.is_proc_macro(index) {
774 self.kind(index).def_kind()
776 DefKind::Macro(macro_kind(self.raw_proc_macro(index)))
780 fn get_span(&self, index: DefIndex, sess: &Session) -> Span {
785 .unwrap_or_else(|| panic!("Missing span for {:?}", index))
786 .decode((self, sess))
789 fn load_proc_macro(&self, id: DefIndex, sess: &Session) -> SyntaxExtension {
790 let (name, kind, helper_attrs) = match *self.raw_proc_macro(id) {
791 ProcMacro::CustomDerive { trait_name, attributes, client } => {
793 attributes.iter().cloned().map(Symbol::intern).collect::<Vec<_>>();
796 SyntaxExtensionKind::Derive(Box::new(ProcMacroDerive { client })),
800 ProcMacro::Attr { name, client } => {
801 (name, SyntaxExtensionKind::Attr(Box::new(AttrProcMacro { client })), Vec::new())
803 ProcMacro::Bang { name, client } => {
804 (name, SyntaxExtensionKind::Bang(Box::new(BangProcMacro { client })), Vec::new())
808 SyntaxExtension::new(
811 self.get_span(id, sess),
814 Symbol::intern(name),
815 &self.get_item_attrs(id, sess),
819 fn get_trait_def(&self, item_id: DefIndex, sess: &Session) -> ty::TraitDef {
820 match self.kind(item_id) {
821 EntryKind::Trait(data) => {
822 let data = data.decode((self, sess));
824 self.local_def_id(item_id),
829 data.specialization_kind,
830 self.def_path_hash(item_id),
833 EntryKind::TraitAlias => ty::TraitDef::new(
834 self.local_def_id(item_id),
835 hir::Unsafety::Normal,
839 ty::trait_def::TraitSpecializationKind::None,
840 self.def_path_hash(item_id),
842 _ => bug!("def-index does not refer to trait or trait alias"),
852 ) -> ty::VariantDef {
853 let data = match kind {
854 EntryKind::Variant(data) | EntryKind::Struct(data, _) | EntryKind::Union(data, _) => {
860 let adt_kind = match kind {
861 EntryKind::Variant(_) => ty::AdtKind::Enum,
862 EntryKind::Struct(..) => ty::AdtKind::Struct,
863 EntryKind::Union(..) => ty::AdtKind::Union,
868 if adt_kind == ty::AdtKind::Enum { Some(self.local_def_id(index)) } else { None };
869 let ctor_did = data.ctor.map(|index| self.local_def_id(index));
872 self.item_ident(index, sess),
880 .unwrap_or(Lazy::empty())
882 .map(|index| ty::FieldDef {
883 did: self.local_def_id(index),
884 ident: self.item_ident(index, sess),
885 vis: self.get_visibility(index),
892 data.is_non_exhaustive,
896 fn get_adt_def(&self, item_id: DefIndex, tcx: TyCtxt<'tcx>) -> &'tcx ty::AdtDef {
897 let kind = self.kind(item_id);
898 let did = self.local_def_id(item_id);
900 let (adt_kind, repr) = match kind {
901 EntryKind::Enum(repr) => (ty::AdtKind::Enum, repr),
902 EntryKind::Struct(_, repr) => (ty::AdtKind::Struct, repr),
903 EntryKind::Union(_, repr) => (ty::AdtKind::Union, repr),
904 _ => bug!("get_adt_def called on a non-ADT {:?}", did),
907 let variants = if let ty::AdtKind::Enum = adt_kind {
912 .unwrap_or(Lazy::empty())
914 .map(|index| self.get_variant(&self.kind(index), index, did, tcx.sess))
917 std::iter::once(self.get_variant(&kind, item_id, did, tcx.sess)).collect()
920 tcx.alloc_adt_def(did, adt_kind, variants, repr)
923 fn get_explicit_predicates(
927 ) -> ty::GenericPredicates<'tcx> {
928 self.root.tables.explicit_predicates.get(self, item_id).unwrap().decode((self, tcx))
931 fn get_inferred_outlives(
935 ) -> &'tcx [(ty::Predicate<'tcx>, Span)] {
940 .map(|predicates| predicates.decode((self, tcx)))
944 fn get_super_predicates(
948 ) -> ty::GenericPredicates<'tcx> {
949 self.root.tables.super_predicates.get(self, item_id).unwrap().decode((self, tcx))
952 fn get_generics(&self, item_id: DefIndex, sess: &Session) -> ty::Generics {
953 self.root.tables.generics.get(self, item_id).unwrap().decode((self, sess))
956 fn get_type(&self, id: DefIndex, tcx: TyCtxt<'tcx>) -> Ty<'tcx> {
957 self.root.tables.ty.get(self, id).unwrap().decode((self, tcx))
960 fn get_stability(&self, id: DefIndex) -> Option<attr::Stability> {
961 match self.is_proc_macro(id) {
962 true => self.root.proc_macro_data.as_ref().unwrap().stability,
963 false => self.root.tables.stability.get(self, id).map(|stab| stab.decode(self)),
967 fn get_const_stability(&self, id: DefIndex) -> Option<attr::ConstStability> {
968 self.root.tables.const_stability.get(self, id).map(|stab| stab.decode(self))
971 fn get_deprecation(&self, id: DefIndex) -> Option<attr::Deprecation> {
976 .filter(|_| !self.is_proc_macro(id))
977 .map(|depr| depr.decode(self))
980 fn get_visibility(&self, id: DefIndex) -> ty::Visibility {
981 match self.is_proc_macro(id) {
982 true => ty::Visibility::Public,
983 false => self.root.tables.visibility.get(self, id).unwrap().decode(self),
987 fn get_impl_data(&self, id: DefIndex) -> ImplData {
988 match self.kind(id) {
989 EntryKind::Impl(data) => data.decode(self),
994 fn get_parent_impl(&self, id: DefIndex) -> Option<DefId> {
995 self.get_impl_data(id).parent_impl
998 fn get_impl_polarity(&self, id: DefIndex) -> ty::ImplPolarity {
999 self.get_impl_data(id).polarity
1002 fn get_impl_defaultness(&self, id: DefIndex) -> hir::Defaultness {
1003 self.get_impl_data(id).defaultness
1006 fn get_coerce_unsized_info(&self, id: DefIndex) -> Option<ty::adjustment::CoerceUnsizedInfo> {
1007 self.get_impl_data(id).coerce_unsized_info
1010 fn get_impl_trait(&self, id: DefIndex, tcx: TyCtxt<'tcx>) -> Option<ty::TraitRef<'tcx>> {
1011 self.root.tables.impl_trait_ref.get(self, id).map(|tr| tr.decode((self, tcx)))
1014 /// Iterates over all the stability attributes in the given crate.
1015 fn get_lib_features(&self, tcx: TyCtxt<'tcx>) -> &'tcx [(Symbol, Option<Symbol>)] {
1016 // FIXME: For a proc macro crate, not sure whether we should return the "host"
1017 // features or an empty Vec. Both don't cause ICEs.
1018 tcx.arena.alloc_from_iter(self.root.lib_features.decode(self))
1021 /// Iterates over the language items in the given crate.
1022 fn get_lang_items(&self, tcx: TyCtxt<'tcx>) -> &'tcx [(DefId, usize)] {
1023 if self.root.is_proc_macro_crate() {
1024 // Proc macro crates do not export any lang-items to the target.
1027 tcx.arena.alloc_from_iter(
1031 .map(|(def_index, index)| (self.local_def_id(def_index), index)),
1036 /// Iterates over the diagnostic items in the given crate.
1037 fn get_diagnostic_items(&self) -> FxHashMap<Symbol, DefId> {
1038 if self.root.is_proc_macro_crate() {
1039 // Proc macro crates do not export any diagnostic-items to the target.
1045 .map(|(name, def_index)| (name, self.local_def_id(def_index)))
1050 /// Iterates over each child of the given item.
1051 fn each_child_of_item<F>(&self, id: DefIndex, mut callback: F, sess: &Session)
1053 F: FnMut(Export<hir::HirId>),
1055 if let Some(data) = &self.root.proc_macro_data {
1056 /* If we are loading as a proc macro, we want to return the view of this crate
1057 * as a proc macro crate.
1059 if id == CRATE_DEF_INDEX {
1060 let macros = data.macros.decode(self);
1061 for def_index in macros {
1062 let raw_macro = self.raw_proc_macro(def_index);
1064 DefKind::Macro(macro_kind(raw_macro)),
1065 self.local_def_id(def_index),
1067 let ident = self.item_ident(def_index, sess);
1068 callback(Export { ident, res, vis: ty::Visibility::Public, span: ident.span });
1075 let kind = match self.maybe_kind(id) {
1080 // Iterate over all children.
1081 let macros_only = self.dep_kind.lock().macros_only();
1082 let children = self.root.tables.children.get(self, id).unwrap_or(Lazy::empty());
1083 for child_index in children.decode((self, sess)) {
1089 if let Some(child_kind) = self.maybe_kind(child_index) {
1091 EntryKind::MacroDef(..) => {}
1092 _ if macros_only => continue,
1096 // Hand off the item to the callback.
1098 // FIXME(eddyb) Don't encode these in children.
1099 EntryKind::ForeignMod => {
1100 let child_children = self
1104 .get(self, child_index)
1105 .unwrap_or(Lazy::empty());
1106 for child_index in child_children.decode((self, sess)) {
1107 let kind = self.def_kind(child_index);
1109 res: Res::Def(kind, self.local_def_id(child_index)),
1110 ident: self.item_ident(child_index, sess),
1111 vis: self.get_visibility(child_index),
1116 .get(self, child_index)
1118 .decode((self, sess)),
1123 EntryKind::Impl(_) => continue,
1128 let def_key = self.def_key(child_index);
1129 let span = self.get_span(child_index, sess);
1130 if def_key.disambiguated_data.data.get_opt_name().is_some() {
1131 let kind = self.def_kind(child_index);
1132 let ident = self.item_ident(child_index, sess);
1133 let vis = self.get_visibility(child_index);
1134 let def_id = self.local_def_id(child_index);
1135 let res = Res::Def(kind, def_id);
1136 callback(Export { res, ident, vis, span });
1137 // For non-re-export structs and variants add their constructors to children.
1138 // Re-export lists automatically contain constructors when necessary.
1140 DefKind::Struct => {
1141 if let Some(ctor_def_id) = self.get_ctor_def_id(child_index) {
1142 let ctor_kind = self.get_ctor_kind(child_index);
1144 Res::Def(DefKind::Ctor(CtorOf::Struct, ctor_kind), ctor_def_id);
1145 let vis = self.get_visibility(ctor_def_id.index);
1146 callback(Export { res: ctor_res, vis, ident, span });
1149 DefKind::Variant => {
1150 // Braced variants, unlike structs, generate unusable names in
1151 // value namespace, they are reserved for possible future use.
1152 // It's ok to use the variant's id as a ctor id since an
1153 // error will be reported on any use of such resolution anyway.
1154 let ctor_def_id = self.get_ctor_def_id(child_index).unwrap_or(def_id);
1155 let ctor_kind = self.get_ctor_kind(child_index);
1157 Res::Def(DefKind::Ctor(CtorOf::Variant, ctor_kind), ctor_def_id);
1158 let mut vis = self.get_visibility(ctor_def_id.index);
1159 if ctor_def_id == def_id && vis == ty::Visibility::Public {
1160 // For non-exhaustive variants lower the constructor visibility to
1161 // within the crate. We only need this for fictive constructors,
1162 // for other constructors correct visibilities
1163 // were already encoded in metadata.
1164 let attrs = self.get_item_attrs(def_id.index, sess);
1165 if sess.contains_name(&attrs, sym::non_exhaustive) {
1166 let crate_def_id = self.local_def_id(CRATE_DEF_INDEX);
1167 vis = ty::Visibility::Restricted(crate_def_id);
1170 callback(Export { res: ctor_res, ident, vis, span });
1178 if let EntryKind::Mod(data) = kind {
1179 for exp in data.decode((self, sess)).reexports.decode((self, sess)) {
1181 Res::Def(DefKind::Macro(..), _) => {}
1182 _ if macros_only => continue,
1190 fn is_item_mir_available(&self, id: DefIndex) -> bool {
1191 !self.is_proc_macro(id) && self.root.tables.mir.get(self, id).is_some()
1194 fn module_expansion(&self, id: DefIndex, sess: &Session) -> ExpnId {
1195 if let EntryKind::Mod(m) = self.kind(id) {
1196 m.decode((self, sess)).expansion
1198 panic!("Expected module, found {:?}", self.local_def_id(id))
1202 fn get_optimized_mir(&self, tcx: TyCtxt<'tcx>, id: DefIndex) -> Body<'tcx> {
1207 .filter(|_| !self.is_proc_macro(id))
1208 .unwrap_or_else(|| {
1209 bug!("get_optimized_mir: missing MIR for `{:?}`", self.local_def_id(id))
1211 .decode((self, tcx))
1214 fn get_mir_abstract_const(
1218 ) -> Result<Option<&'tcx [mir::abstract_const::Node<'tcx>]>, ErrorReported> {
1221 .mir_abstract_consts
1223 .filter(|_| !self.is_proc_macro(id))
1224 .map_or(Ok(None), |v| Ok(Some(v.decode((self, tcx)))))
1227 fn get_unused_generic_params(&self, id: DefIndex) -> FiniteBitSet<u32> {
1230 .unused_generic_params
1232 .filter(|_| !self.is_proc_macro(id))
1233 .map(|params| params.decode(self))
1234 .unwrap_or_default()
1237 fn get_promoted_mir(&self, tcx: TyCtxt<'tcx>, id: DefIndex) -> IndexVec<Promoted, Body<'tcx>> {
1242 .filter(|_| !self.is_proc_macro(id))
1243 .unwrap_or_else(|| {
1244 bug!("get_promoted_mir: missing MIR for `{:?}`", self.local_def_id(id))
1246 .decode((self, tcx))
1249 fn mir_const_qualif(&self, id: DefIndex) -> mir::ConstQualifs {
1250 match self.kind(id) {
1251 EntryKind::AnonConst(qualif, _)
1252 | EntryKind::Const(qualif, _)
1253 | EntryKind::AssocConst(
1254 AssocContainer::ImplDefault
1255 | AssocContainer::ImplFinal
1256 | AssocContainer::TraitWithDefault,
1260 _ => bug!("mir_const_qualif: unexpected kind"),
1264 fn get_associated_item(&self, id: DefIndex, sess: &Session) -> ty::AssocItem {
1265 let def_key = self.def_key(id);
1266 let parent = self.local_def_id(def_key.parent.unwrap());
1267 let ident = self.item_ident(id, sess);
1269 let (kind, container, has_self) = match self.kind(id) {
1270 EntryKind::AssocConst(container, _, _) => (ty::AssocKind::Const, container, false),
1271 EntryKind::AssocFn(data) => {
1272 let data = data.decode(self);
1273 (ty::AssocKind::Fn, data.container, data.has_self)
1275 EntryKind::AssocType(container) => (ty::AssocKind::Type, container, false),
1276 _ => bug!("cannot get associated-item of `{:?}`", def_key),
1282 vis: self.get_visibility(id),
1283 defaultness: container.defaultness(),
1284 def_id: self.local_def_id(id),
1285 container: container.with_def_id(parent),
1286 fn_has_self_parameter: has_self,
1290 fn get_item_variances(&self, id: DefIndex) -> Vec<ty::Variance> {
1291 self.root.tables.variances.get(self, id).unwrap_or(Lazy::empty()).decode(self).collect()
1294 fn get_ctor_kind(&self, node_id: DefIndex) -> CtorKind {
1295 match self.kind(node_id) {
1296 EntryKind::Struct(data, _) | EntryKind::Union(data, _) | EntryKind::Variant(data) => {
1297 data.decode(self).ctor_kind
1299 _ => CtorKind::Fictive,
1303 fn get_ctor_def_id(&self, node_id: DefIndex) -> Option<DefId> {
1304 match self.kind(node_id) {
1305 EntryKind::Struct(data, _) => {
1306 data.decode(self).ctor.map(|index| self.local_def_id(index))
1308 EntryKind::Variant(data) => {
1309 data.decode(self).ctor.map(|index| self.local_def_id(index))
1315 fn get_item_attrs(&self, node_id: DefIndex, sess: &Session) -> Vec<ast::Attribute> {
1316 // The attributes for a tuple struct/variant are attached to the definition, not the ctor;
1317 // we assume that someone passing in a tuple struct ctor is actually wanting to
1318 // look at the definition
1319 let def_key = self.def_key(node_id);
1320 let item_id = if def_key.disambiguated_data.data == DefPathData::Ctor {
1321 def_key.parent.unwrap()
1330 .unwrap_or(Lazy::empty())
1331 .decode((self, sess))
1332 .collect::<Vec<_>>()
1335 fn get_struct_field_names(&self, id: DefIndex, sess: &Session) -> Vec<Spanned<Symbol>> {
1340 .unwrap_or(Lazy::empty())
1342 .map(|index| respan(self.get_span(index, sess), self.item_ident(index, sess).name))
1346 fn get_inherent_implementations_for_type(
1350 ) -> &'tcx [DefId] {
1351 tcx.arena.alloc_from_iter(
1356 .unwrap_or(Lazy::empty())
1358 .map(|index| self.local_def_id(index)),
1362 fn get_implementations_for_trait(
1365 filter: Option<DefId>,
1366 ) -> &'tcx [(DefId, Option<ty::fast_reject::SimplifiedType>)] {
1367 if self.root.is_proc_macro_crate() {
1368 // proc-macro crates export no trait impls.
1372 // Do a reverse lookup beforehand to avoid touching the crate_num
1373 // hash map in the loop below.
1374 let filter = match filter.map(|def_id| self.reverse_translate_def_id(def_id)) {
1375 Some(Some(def_id)) => Some((def_id.krate.as_u32(), def_id.index)),
1376 Some(None) => return &[],
1380 if let Some(filter) = filter {
1381 if let Some(impls) = self.trait_impls.get(&filter) {
1382 tcx.arena.alloc_from_iter(
1383 impls.decode(self).map(|(idx, simplified_self_ty)| {
1384 (self.local_def_id(idx), simplified_self_ty)
1391 tcx.arena.alloc_from_iter(self.trait_impls.values().flat_map(|impls| {
1394 .map(|(idx, simplified_self_ty)| (self.local_def_id(idx), simplified_self_ty))
1399 fn get_trait_of_item(&self, id: DefIndex) -> Option<DefId> {
1400 let def_key = self.def_key(id);
1401 match def_key.disambiguated_data.data {
1402 DefPathData::TypeNs(..) | DefPathData::ValueNs(..) => (),
1403 // Not an associated item
1406 def_key.parent.and_then(|parent_index| match self.kind(parent_index) {
1407 EntryKind::Trait(_) | EntryKind::TraitAlias => Some(self.local_def_id(parent_index)),
1412 fn get_native_libraries(&self, sess: &Session) -> Vec<NativeLib> {
1413 if self.root.is_proc_macro_crate() {
1414 // Proc macro crates do not have any *target* native libraries.
1417 self.root.native_libraries.decode((self, sess)).collect()
1421 fn get_foreign_modules(&self, tcx: TyCtxt<'tcx>) -> &'tcx [ForeignModule] {
1422 if self.root.is_proc_macro_crate() {
1423 // Proc macro crates do not have any *target* foreign modules.
1426 tcx.arena.alloc_from_iter(self.root.foreign_modules.decode((self, tcx.sess)))
1430 fn get_dylib_dependency_formats(
1433 ) -> &'tcx [(CrateNum, LinkagePreference)] {
1434 tcx.arena.alloc_from_iter(
1435 self.root.dylib_dependency_formats.decode(self).enumerate().flat_map(|(i, link)| {
1436 let cnum = CrateNum::new(i + 1);
1437 link.map(|link| (self.cnum_map[cnum], link))
1442 fn get_missing_lang_items(&self, tcx: TyCtxt<'tcx>) -> &'tcx [lang_items::LangItem] {
1443 if self.root.is_proc_macro_crate() {
1444 // Proc macro crates do not depend on any target weak lang-items.
1447 tcx.arena.alloc_from_iter(self.root.lang_items_missing.decode(self))
1451 fn get_fn_param_names(&self, tcx: TyCtxt<'tcx>, id: DefIndex) -> &'tcx [Ident] {
1452 let param_names = match self.kind(id) {
1453 EntryKind::Fn(data) | EntryKind::ForeignFn(data) => data.decode(self).param_names,
1454 EntryKind::AssocFn(data) => data.decode(self).fn_data.param_names,
1457 tcx.arena.alloc_from_iter(param_names.decode((self, tcx)))
1460 fn exported_symbols(
1463 ) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportLevel)] {
1464 if self.root.is_proc_macro_crate() {
1465 // If this crate is a custom derive crate, then we're not even going to
1466 // link those in so we skip those crates.
1469 tcx.arena.alloc_from_iter(self.root.exported_symbols.decode((self, tcx)))
1473 fn get_rendered_const(&self, id: DefIndex) -> String {
1474 match self.kind(id) {
1475 EntryKind::AnonConst(_, data)
1476 | EntryKind::Const(_, data)
1477 | EntryKind::AssocConst(_, _, data) => data.decode(self).0,
1482 fn get_macro(&self, id: DefIndex, sess: &Session) -> MacroDef {
1483 match self.kind(id) {
1484 EntryKind::MacroDef(macro_def) => macro_def.decode((self, sess)),
1489 // This replicates some of the logic of the crate-local `is_const_fn_raw` query, because we
1490 // don't serialize constness for tuple variant and tuple struct constructors.
1491 fn is_const_fn_raw(&self, id: DefIndex) -> bool {
1492 let constness = match self.kind(id) {
1493 EntryKind::AssocFn(data) => data.decode(self).fn_data.constness,
1494 EntryKind::Fn(data) => data.decode(self).constness,
1495 EntryKind::ForeignFn(data) => data.decode(self).constness,
1496 EntryKind::Variant(..) | EntryKind::Struct(..) => hir::Constness::Const,
1497 _ => hir::Constness::NotConst,
1499 constness == hir::Constness::Const
1502 fn asyncness(&self, id: DefIndex) -> hir::IsAsync {
1503 match self.kind(id) {
1504 EntryKind::Fn(data) => data.decode(self).asyncness,
1505 EntryKind::AssocFn(data) => data.decode(self).fn_data.asyncness,
1506 EntryKind::ForeignFn(data) => data.decode(self).asyncness,
1507 _ => bug!("asyncness: expected function kind"),
1511 fn is_foreign_item(&self, id: DefIndex) -> bool {
1512 match self.kind(id) {
1513 EntryKind::ForeignImmStatic | EntryKind::ForeignMutStatic | EntryKind::ForeignFn(_) => {
1520 fn static_mutability(&self, id: DefIndex) -> Option<hir::Mutability> {
1521 match self.kind(id) {
1522 EntryKind::ImmStatic | EntryKind::ForeignImmStatic => Some(hir::Mutability::Not),
1523 EntryKind::MutStatic | EntryKind::ForeignMutStatic => Some(hir::Mutability::Mut),
1528 fn generator_kind(&self, id: DefIndex) -> Option<hir::GeneratorKind> {
1529 match self.kind(id) {
1530 EntryKind::Generator(data) => Some(data),
1535 fn fn_sig(&self, id: DefIndex, tcx: TyCtxt<'tcx>) -> ty::PolyFnSig<'tcx> {
1536 self.root.tables.fn_sig.get(self, id).unwrap().decode((self, tcx))
1540 fn def_key(&self, index: DefIndex) -> DefKey {
1541 *self.def_key_cache.lock().entry(index).or_insert_with(|| {
1542 let mut key = self.root.tables.def_keys.get(self, index).unwrap().decode(self);
1543 if self.is_proc_macro(index) {
1544 let name = self.raw_proc_macro(index).name();
1545 key.disambiguated_data.data = DefPathData::MacroNs(Symbol::intern(name));
1551 // Returns the path leading to the thing with this `id`.
1552 fn def_path(&self, id: DefIndex) -> DefPath {
1553 debug!("def_path(cnum={:?}, id={:?})", self.cnum, id);
1554 DefPath::make(self.cnum, id, |parent| self.def_key(parent))
1557 fn def_path_hash_unlocked(
1560 def_path_hashes: &mut FxHashMap<DefIndex, DefPathHash>,
1562 *def_path_hashes.entry(index).or_insert_with(|| {
1563 self.root.tables.def_path_hashes.get(self, index).unwrap().decode(self)
1568 fn def_path_hash(&self, index: DefIndex) -> DefPathHash {
1569 let mut def_path_hashes = self.def_path_hash_cache.lock();
1570 self.def_path_hash_unlocked(index, &mut def_path_hashes)
1573 fn all_def_path_hashes_and_def_ids(&self) -> Vec<(DefPathHash, DefId)> {
1574 let mut def_path_hashes = self.def_path_hash_cache.lock();
1575 let mut def_index_to_data = |index| {
1576 (self.def_path_hash_unlocked(index, &mut def_path_hashes), self.local_def_id(index))
1578 if let Some(data) = &self.root.proc_macro_data {
1579 std::iter::once(CRATE_DEF_INDEX)
1580 .chain(data.macros.decode(self))
1581 .map(def_index_to_data)
1584 (0..self.num_def_ids())
1585 .map(|index| def_index_to_data(DefIndex::from_usize(index)))
1590 /// Get the `DepNodeIndex` corresponding this crate. The result of this
1591 /// method is cached in the `dep_node_index` field.
1592 fn get_crate_dep_node_index(&self, tcx: TyCtxt<'tcx>) -> DepNodeIndex {
1593 let mut dep_node_index = self.dep_node_index.load();
1595 if unlikely!(dep_node_index == DepNodeIndex::INVALID) {
1596 // We have not cached the DepNodeIndex for this upstream crate yet,
1597 // so use the dep-graph to find it out and cache it.
1598 // Note that multiple threads can enter this block concurrently.
1599 // That is fine because the DepNodeIndex remains constant
1600 // throughout the whole compilation session, and multiple stores
1601 // would always write the same value.
1603 let def_path_hash = self.def_path_hash(CRATE_DEF_INDEX);
1605 DepNode::from_def_path_hash(def_path_hash, dep_graph::DepKind::CrateMetadata);
1607 dep_node_index = tcx.dep_graph.dep_node_index_of(&dep_node);
1608 assert!(dep_node_index != DepNodeIndex::INVALID);
1609 self.dep_node_index.store(dep_node_index);
1615 /// Imports the source_map from an external crate into the source_map of the crate
1616 /// currently being compiled (the "local crate").
1618 /// The import algorithm works analogous to how AST items are inlined from an
1619 /// external crate's metadata:
1620 /// For every SourceFile in the external source_map an 'inline' copy is created in the
1621 /// local source_map. The correspondence relation between external and local
1622 /// SourceFiles is recorded in the `ImportedSourceFile` objects returned from this
1623 /// function. When an item from an external crate is later inlined into this
1624 /// crate, this correspondence information is used to translate the span
1625 /// information of the inlined item so that it refers the correct positions in
1626 /// the local source_map (see `<decoder::DecodeContext as SpecializedDecoder<Span>>`).
1628 /// The import algorithm in the function below will reuse SourceFiles already
1629 /// existing in the local source_map. For example, even if the SourceFile of some
1630 /// source file of libstd gets imported many times, there will only ever be
1631 /// one SourceFile object for the corresponding file in the local source_map.
1633 /// Note that imported SourceFiles do not actually contain the source code of the
1634 /// file they represent, just information about length, line breaks, and
1635 /// multibyte characters. This information is enough to generate valid debuginfo
1636 /// for items inlined from other crates.
1638 /// Proc macro crates don't currently export spans, so this function does not have
1639 /// to work for them.
1640 fn imported_source_files(&self, sess: &Session) -> &'a [ImportedSourceFile] {
1641 // Translate the virtual `/rustc/$hash` prefix back to a real directory
1642 // that should hold actual sources, where possible.
1644 // NOTE: if you update this, you might need to also update bootstrap's code for generating
1645 // the `rust-src` component in `Src::run` in `src/bootstrap/dist.rs`.
1646 let virtual_rust_source_base_dir = option_env!("CFG_VIRTUAL_RUST_SOURCE_BASE_DIR")
1649 // Only spend time on further checks if we have what to translate *to*.
1650 sess.real_rust_source_base_dir.is_some()
1652 .filter(|virtual_dir| {
1653 // Don't translate away `/rustc/$hash` if we're still remapping to it,
1654 // since that means we're still building `std`/`rustc` that need it,
1655 // and we don't want the real path to leak into codegen/debuginfo.
1656 !sess.opts.remap_path_prefix.iter().any(|(_from, to)| to == virtual_dir)
1658 let try_to_translate_virtual_to_real = |name: &mut rustc_span::FileName| {
1660 "try_to_translate_virtual_to_real(name={:?}): \
1661 virtual_rust_source_base_dir={:?}, real_rust_source_base_dir={:?}",
1662 name, virtual_rust_source_base_dir, sess.real_rust_source_base_dir,
1665 if let Some(virtual_dir) = virtual_rust_source_base_dir {
1666 if let Some(real_dir) = &sess.real_rust_source_base_dir {
1667 if let rustc_span::FileName::Real(old_name) = name {
1668 if let rustc_span::RealFileName::Named(one_path) = old_name {
1669 if let Ok(rest) = one_path.strip_prefix(virtual_dir) {
1670 let virtual_name = one_path.clone();
1672 // The std library crates are in
1673 // `$sysroot/lib/rustlib/src/rust/library`, whereas other crates
1674 // may be in `$sysroot/lib/rustlib/src/rust/` directly. So we
1675 // detect crates from the std libs and handle them specially.
1676 const STD_LIBS: &[&str] = &[
1686 "profiler_builtins",
1688 "rustc-std-workspace-core",
1689 "rustc-std-workspace-alloc",
1690 "rustc-std-workspace-std",
1693 let is_std_lib = STD_LIBS.iter().any(|l| rest.starts_with(l));
1695 let new_path = if is_std_lib {
1696 real_dir.join("library").join(rest)
1702 "try_to_translate_virtual_to_real: `{}` -> `{}`",
1703 virtual_name.display(),
1706 let new_name = rustc_span::RealFileName::Devirtualized {
1707 local_path: new_path,
1710 *old_name = new_name;
1718 self.cdata.source_map_import_info.get_or_init(|| {
1719 let external_source_map = self.root.source_map.decode(self);
1722 .map(|source_file_to_import| {
1723 // We can't reuse an existing SourceFile, so allocate a new one
1724 // containing the information we need.
1725 let rustc_span::SourceFile {
1732 mut multibyte_chars,
1733 mut non_narrow_chars,
1737 } = source_file_to_import;
1739 // If this file's path has been remapped to `/rustc/$hash`,
1740 // we might be able to reverse that (also see comments above,
1741 // on `try_to_translate_virtual_to_real`).
1742 // FIXME(eddyb) we could check `name_was_remapped` here,
1743 // but in practice it seems to be always `false`.
1744 try_to_translate_virtual_to_real(&mut name);
1746 let source_length = (end_pos - start_pos).to_usize();
1748 // Translate line-start positions and multibyte character
1749 // position into frame of reference local to file.
1750 // `SourceMap::new_imported_source_file()` will then translate those
1751 // coordinates to their new global frame of reference when the
1752 // offset of the SourceFile is known.
1753 for pos in &mut lines {
1754 *pos = *pos - start_pos;
1756 for mbc in &mut multibyte_chars {
1757 mbc.pos = mbc.pos - start_pos;
1759 for swc in &mut non_narrow_chars {
1760 *swc = *swc - start_pos;
1762 for np in &mut normalized_pos {
1763 np.pos = np.pos - start_pos;
1766 let local_version = sess.source_map().new_imported_source_file(
1781 "CrateMetaData::imported_source_files alloc \
1782 source_file {:?} original (start_pos {:?} end_pos {:?}) \
1783 translated (start_pos {:?} end_pos {:?})",
1787 local_version.start_pos,
1788 local_version.end_pos
1791 ImportedSourceFile {
1792 original_start_pos: start_pos,
1793 original_end_pos: end_pos,
1794 translated_source_file: local_version,
1802 impl CrateMetadata {
1806 root: CrateRoot<'static>,
1807 raw_proc_macros: Option<&'static [ProcMacro]>,
1809 cnum_map: CrateNumMap,
1810 dep_kind: CrateDepKind,
1811 source: CrateSource,
1813 host_hash: Option<Svh>,
1814 ) -> CrateMetadata {
1815 let trait_impls = root
1817 .decode((&blob, sess))
1818 .map(|trait_impls| (trait_impls.trait_id, trait_impls.impls))
1820 let alloc_decoding_state =
1821 AllocDecodingState::new(root.interpret_alloc_index.decode(&blob).collect());
1822 let dependencies = Lock::new(cnum_map.iter().cloned().collect());
1828 source_map_import_info: OnceCell::new(),
1829 alloc_decoding_state,
1830 dep_node_index: AtomicCell::new(DepNodeIndex::INVALID),
1834 dep_kind: Lock::new(dep_kind),
1838 extern_crate: Lock::new(None),
1839 hygiene_context: Default::default(),
1840 def_key_cache: Default::default(),
1841 def_path_hash_cache: Default::default(),
1845 crate fn dependencies(&self) -> LockGuard<'_, Vec<CrateNum>> {
1846 self.dependencies.borrow()
1849 crate fn add_dependency(&self, cnum: CrateNum) {
1850 self.dependencies.borrow_mut().push(cnum);
1853 crate fn update_extern_crate(&self, new_extern_crate: ExternCrate) -> bool {
1854 let mut extern_crate = self.extern_crate.borrow_mut();
1855 let update = Some(new_extern_crate.rank()) > extern_crate.as_ref().map(ExternCrate::rank);
1857 *extern_crate = Some(new_extern_crate);
1862 crate fn source(&self) -> &CrateSource {
1866 crate fn dep_kind(&self) -> CrateDepKind {
1867 *self.dep_kind.lock()
1870 crate fn update_dep_kind(&self, f: impl FnOnce(CrateDepKind) -> CrateDepKind) {
1871 self.dep_kind.with_lock(|dep_kind| *dep_kind = f(*dep_kind))
1874 crate fn panic_strategy(&self) -> PanicStrategy {
1875 self.root.panic_strategy
1878 crate fn needs_panic_runtime(&self) -> bool {
1879 self.root.needs_panic_runtime
1882 crate fn is_panic_runtime(&self) -> bool {
1883 self.root.panic_runtime
1886 crate fn is_profiler_runtime(&self) -> bool {
1887 self.root.profiler_runtime
1890 crate fn needs_allocator(&self) -> bool {
1891 self.root.needs_allocator
1894 crate fn has_global_allocator(&self) -> bool {
1895 self.root.has_global_allocator
1898 crate fn has_default_lib_allocator(&self) -> bool {
1899 self.root.has_default_lib_allocator
1902 crate fn is_proc_macro_crate(&self) -> bool {
1903 self.root.is_proc_macro_crate()
1906 crate fn name(&self) -> Symbol {
1910 crate fn disambiguator(&self) -> CrateDisambiguator {
1911 self.root.disambiguator
1914 crate fn hash(&self) -> Svh {
1918 fn num_def_ids(&self) -> usize {
1919 self.root.tables.def_keys.size()
1922 fn local_def_id(&self, index: DefIndex) -> DefId {
1923 DefId { krate: self.cnum, index }
1926 // Translate a DefId from the current compilation environment to a DefId
1927 // for an external crate.
1928 fn reverse_translate_def_id(&self, did: DefId) -> Option<DefId> {
1929 for (local, &global) in self.cnum_map.iter_enumerated() {
1930 if global == did.krate {
1931 return Some(DefId { krate: local, index: did.index });
1939 // Cannot be implemented on 'ProcMacro', as libproc_macro
1940 // does not depend on librustc_ast
1941 fn macro_kind(raw: &ProcMacro) -> MacroKind {
1943 ProcMacro::CustomDerive { .. } => MacroKind::Derive,
1944 ProcMacro::Attr { .. } => MacroKind::Attr,
1945 ProcMacro::Bang { .. } => MacroKind::Bang,