1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Decoding metadata from a single crate's metadata
13 #![allow(non_camel_case_types)]
17 use astencode::decode_inlined_item;
18 use cstore::{self, CrateMetadata};
21 use encoder::def_to_u64;
24 use tydecode::TyDecoder;
26 use rustc::hir::svh::Svh;
27 use rustc::hir::map as hir_map;
28 use rustc::hir::map::DefKey;
29 use rustc::util::nodemap::FnvHashMap;
31 use rustc::session::config::PanicStrategy;
33 use middle::cstore::{InlinedItem, LinkagePreference};
34 use middle::cstore::{DefLike, DlDef, DlField, DlImpl, tls};
35 use rustc::hir::def::Def;
36 use rustc::hir::def_id::{DefId, DefIndex};
37 use middle::lang_items;
38 use rustc::ty::{ImplContainer, TraitContainer};
39 use rustc::ty::{self, Ty, TyCtxt, TypeFoldable, VariantKind};
41 use rustc_const_math::ConstInt;
44 use rustc::mir::visit::MutVisitor;
53 use rustc_serialize::Decodable;
55 use syntax::parse::token;
58 use syntax::print::pprust;
60 use syntax_pos::{self, Span, BytePos, NO_EXPANSION};
62 pub type Cmd<'a> = &'a CrateMetadata;
65 fn get_item(&self, item_id: DefIndex) -> Option<rbml::Doc> {
66 self.index.lookup_item(self.data(), item_id).map(|pos| {
67 reader::doc_at(self.data(), pos as usize).unwrap().doc
71 fn lookup_item(&self, item_id: DefIndex) -> rbml::Doc {
72 match self.get_item(item_id) {
73 None => bug!("lookup_item: id not found: {:?} in crate {:?} with number {}",
82 pub fn load_index(data: &[u8]) -> index::Index {
83 let index = reader::get_doc(rbml::Doc::new(data), tag_index);
84 index::Index::from_rbml(index)
87 pub fn crate_rustc_version(data: &[u8]) -> Option<String> {
88 let doc = rbml::Doc::new(data);
89 reader::maybe_get_doc(doc, tag_rustc_version).map(|s| s.as_str())
92 pub fn load_xrefs(data: &[u8]) -> index::DenseIndex {
93 let index = reader::get_doc(rbml::Doc::new(data), tag_xref_index);
94 index::DenseIndex::from_buf(index.data, index.start, index.end)
97 // Go through each item in the metadata and create a map from that
98 // item's def-key to the item's DefIndex.
99 pub fn load_key_map(data: &[u8]) -> FnvHashMap<DefKey, DefIndex> {
100 let root_doc = rbml::Doc::new(data);
101 let items_doc = reader::get_doc(root_doc, tag_items);
102 let items_data_doc = reader::get_doc(items_doc, tag_items_data);
103 reader::docs(items_data_doc)
104 .filter(|&(tag, _)| tag == tag_items_data_item)
105 .map(|(_, item_doc)| {
106 // load def-key from item
107 let key = item_def_key(item_doc);
109 // load def-index from item; we only encode the full def-id,
110 // so just pull out the index
111 let def_id_doc = reader::get_doc(item_doc, tag_def_id);
112 let def_id = untranslated_def_id(def_id_doc);
113 assert!(def_id.is_local()); // local to the crate we are decoding, that is
120 #[derive(Clone, Copy, Debug, PartialEq)]
131 Variant(VariantKind), // V, v, w
135 Struct(VariantKind), // S, s, u
141 fn item_family(item: rbml::Doc) -> Family {
142 let fam = reader::get_doc(item, tag_items_data_item_family);
143 match reader::doc_as_u8(fam) as char {
154 'V' => Variant(VariantKind::Struct),
155 'v' => Variant(VariantKind::Tuple),
156 'w' => Variant(VariantKind::Unit),
160 'S' => Struct(VariantKind::Struct),
161 's' => Struct(VariantKind::Tuple),
162 'u' => Struct(VariantKind::Unit),
164 'N' => InheritedField,
165 c => bug!("unexpected family char: {}", c)
169 fn item_visibility(item: rbml::Doc) -> ty::Visibility {
170 match reader::maybe_get_doc(item, tag_items_data_item_visibility) {
171 None => ty::Visibility::Public,
172 Some(visibility_doc) => {
173 match reader::doc_as_u8(visibility_doc) as char {
174 'y' => ty::Visibility::Public,
175 'i' => ty::Visibility::PrivateExternal,
176 _ => bug!("unknown visibility character")
182 fn fn_constness(item: rbml::Doc) -> hir::Constness {
183 match reader::maybe_get_doc(item, tag_items_data_item_constness) {
184 None => hir::Constness::NotConst,
185 Some(constness_doc) => {
186 match reader::doc_as_u8(constness_doc) as char {
187 'c' => hir::Constness::Const,
188 'n' => hir::Constness::NotConst,
189 _ => bug!("unknown constness character")
195 fn item_defaultness(item: rbml::Doc) -> hir::Defaultness {
196 match reader::maybe_get_doc(item, tag_items_data_item_defaultness) {
197 None => hir::Defaultness::Default, // should occur only for default impls on traits
198 Some(defaultness_doc) => {
199 match reader::doc_as_u8(defaultness_doc) as char {
200 'd' => hir::Defaultness::Default,
201 'f' => hir::Defaultness::Final,
202 _ => bug!("unknown defaultness character")
208 fn item_sort(item: rbml::Doc) -> Option<char> {
209 reader::tagged_docs(item, tag_item_trait_item_sort).nth(0).map(|doc| {
210 doc.as_str_slice().as_bytes()[0] as char
214 fn untranslated_def_id(d: rbml::Doc) -> DefId {
215 let id = reader::doc_as_u64(d);
216 let index = DefIndex::new((id & 0xFFFF_FFFF) as usize);
217 DefId { krate: (id >> 32) as u32, index: index }
220 fn translated_def_id(cdata: Cmd, d: rbml::Doc) -> DefId {
221 let def_id = untranslated_def_id(d);
222 translate_def_id(cdata, def_id)
225 fn item_parent_item(cdata: Cmd, d: rbml::Doc) -> Option<DefId> {
226 reader::tagged_docs(d, tag_items_data_parent_item).nth(0).map(|did| {
227 translated_def_id(cdata, did)
231 fn item_require_parent_item(cdata: Cmd, d: rbml::Doc) -> DefId {
232 translated_def_id(cdata, reader::get_doc(d, tag_items_data_parent_item))
235 fn item_def_id(d: rbml::Doc, cdata: Cmd) -> DefId {
236 translated_def_id(cdata, reader::get_doc(d, tag_def_id))
239 fn reexports<'a>(d: rbml::Doc<'a>) -> reader::TaggedDocsIterator<'a> {
240 reader::tagged_docs(d, tag_items_data_item_reexport)
243 fn variant_disr_val(d: rbml::Doc) -> Option<u64> {
244 reader::maybe_get_doc(d, tag_disr_val).and_then(|val_doc| {
245 reader::with_doc_data(val_doc, |data| {
246 str::from_utf8(data).ok().and_then(|s| s.parse().ok())
251 fn doc_type<'a, 'tcx>(doc: rbml::Doc, tcx: TyCtxt<'a, 'tcx, 'tcx>, cdata: Cmd) -> Ty<'tcx> {
252 let tp = reader::get_doc(doc, tag_items_data_item_type);
253 TyDecoder::with_doc(tcx, cdata.cnum, tp,
254 &mut |did| translate_def_id(cdata, did))
258 fn maybe_doc_type<'a, 'tcx>(doc: rbml::Doc, tcx: TyCtxt<'a, 'tcx, 'tcx>, cdata: Cmd)
259 -> Option<Ty<'tcx>> {
260 reader::maybe_get_doc(doc, tag_items_data_item_type).map(|tp| {
261 TyDecoder::with_doc(tcx, cdata.cnum, tp,
262 &mut |did| translate_def_id(cdata, did))
267 fn doc_trait_ref<'a, 'tcx>(doc: rbml::Doc, tcx: TyCtxt<'a, 'tcx, 'tcx>, cdata: Cmd)
268 -> ty::TraitRef<'tcx> {
269 TyDecoder::with_doc(tcx, cdata.cnum, doc,
270 &mut |did| translate_def_id(cdata, did))
274 fn item_trait_ref<'a, 'tcx>(doc: rbml::Doc, tcx: TyCtxt<'a, 'tcx, 'tcx>, cdata: Cmd)
275 -> ty::TraitRef<'tcx> {
276 let tp = reader::get_doc(doc, tag_item_trait_ref);
277 doc_trait_ref(tp, tcx, cdata)
280 fn item_name(item: rbml::Doc) -> ast::Name {
281 maybe_item_name(item).expect("no item in item_name")
284 fn maybe_item_name(item: rbml::Doc) -> Option<ast::Name> {
285 reader::maybe_get_doc(item, tag_paths_data_name).map(|name| {
286 let string = name.as_str_slice();
287 token::intern(string)
291 fn family_to_variant_kind<'tcx>(family: Family) -> Option<ty::VariantKind> {
293 Struct(VariantKind::Struct) | Variant(VariantKind::Struct) =>
294 Some(ty::VariantKind::Struct),
295 Struct(VariantKind::Tuple) | Variant(VariantKind::Tuple) =>
296 Some(ty::VariantKind::Tuple),
297 Struct(VariantKind::Unit) | Variant(VariantKind::Unit) =>
298 Some(ty::VariantKind::Unit),
303 fn item_to_def_like(cdata: Cmd, item: rbml::Doc, did: DefId) -> DefLike {
304 let fam = item_family(item);
307 // Check whether we have an associated const item.
308 match item_sort(item) {
309 Some('C') | Some('c') => {
310 DlDef(Def::AssociatedConst(did))
313 // Regular const item.
314 DlDef(Def::Const(did))
318 ImmStatic => DlDef(Def::Static(did, false)),
319 MutStatic => DlDef(Def::Static(did, true)),
320 Struct(..) => DlDef(Def::Struct(did)),
321 Fn => DlDef(Def::Fn(did)),
322 Method | StaticMethod => {
323 DlDef(Def::Method(did))
326 if item_sort(item) == Some('t') {
327 let trait_did = item_require_parent_item(cdata, item);
328 DlDef(Def::AssociatedTy(trait_did, did))
330 DlDef(Def::TyAlias(did))
333 Mod => DlDef(Def::Mod(did)),
334 ForeignMod => DlDef(Def::ForeignMod(did)),
336 let enum_did = item_require_parent_item(cdata, item);
337 DlDef(Def::Variant(enum_did, did))
339 Trait => DlDef(Def::Trait(did)),
340 Enum => DlDef(Def::Enum(did)),
341 Impl | DefaultImpl => DlImpl(did),
342 PublicField | InheritedField => DlField,
346 fn parse_unsafety(item_doc: rbml::Doc) -> hir::Unsafety {
347 let unsafety_doc = reader::get_doc(item_doc, tag_unsafety);
348 if reader::doc_as_u8(unsafety_doc) != 0 {
349 hir::Unsafety::Unsafe
351 hir::Unsafety::Normal
355 fn parse_paren_sugar(item_doc: rbml::Doc) -> bool {
356 let paren_sugar_doc = reader::get_doc(item_doc, tag_paren_sugar);
357 reader::doc_as_u8(paren_sugar_doc) != 0
360 fn parse_polarity(item_doc: rbml::Doc) -> hir::ImplPolarity {
361 let polarity_doc = reader::get_doc(item_doc, tag_polarity);
362 if reader::doc_as_u8(polarity_doc) != 0 {
363 hir::ImplPolarity::Negative
365 hir::ImplPolarity::Positive
369 fn parse_associated_type_names(item_doc: rbml::Doc) -> Vec<ast::Name> {
370 let names_doc = reader::get_doc(item_doc, tag_associated_type_names);
371 reader::tagged_docs(names_doc, tag_associated_type_name)
372 .map(|name_doc| token::intern(name_doc.as_str_slice()))
376 pub fn get_trait_def<'a, 'tcx>(cdata: Cmd,
378 tcx: TyCtxt<'a, 'tcx, 'tcx>) -> ty::TraitDef<'tcx>
380 let item_doc = cdata.lookup_item(item_id);
381 let generics = doc_generics(item_doc, tcx, cdata);
382 let unsafety = parse_unsafety(item_doc);
383 let associated_type_names = parse_associated_type_names(item_doc);
384 let paren_sugar = parse_paren_sugar(item_doc);
386 ty::TraitDef::new(unsafety,
389 item_trait_ref(item_doc, tcx, cdata),
390 associated_type_names)
393 pub fn get_adt_def<'a, 'tcx>(cdata: Cmd,
395 tcx: TyCtxt<'a, 'tcx, 'tcx>)
396 -> ty::AdtDefMaster<'tcx>
398 fn expect_variant_kind(family: Family) -> ty::VariantKind {
399 match family_to_variant_kind(family) {
401 _ => bug!("unexpected family: {:?}", family),
404 fn get_enum_variants<'tcx>(cdata: Cmd, doc: rbml::Doc) -> Vec<ty::VariantDefData<'tcx, 'tcx>> {
405 let mut disr_val = 0;
406 reader::tagged_docs(doc, tag_items_data_item_variant).map(|p| {
407 let did = translated_def_id(cdata, p);
408 let item = cdata.lookup_item(did.index);
410 if let Some(disr) = variant_disr_val(item) {
414 disr_val = disr_val.wrapping_add(1);
418 name: item_name(item),
419 fields: get_variant_fields(cdata, item),
420 disr_val: ConstInt::Infer(disr),
421 kind: expect_variant_kind(item_family(item)),
425 fn get_variant_fields<'tcx>(cdata: Cmd, doc: rbml::Doc) -> Vec<ty::FieldDefData<'tcx, 'tcx>> {
427 reader::tagged_docs(doc, tag_item_field).map(|f| {
428 let ff = item_family(f);
430 PublicField | InheritedField => {},
431 _ => bug!("expected field, found {:?}", ff)
433 ty::FieldDefData::new(item_def_id(f, cdata),
435 struct_field_family_to_visibility(ff))
436 }).chain(reader::tagged_docs(doc, tag_item_unnamed_field).map(|f| {
437 let ff = item_family(f);
438 let name = token::with_ident_interner(|interner| interner.intern(index.to_string()));
440 ty::FieldDefData::new(item_def_id(f, cdata), name,
441 struct_field_family_to_visibility(ff))
444 fn get_struct_variant<'tcx>(cdata: Cmd,
446 did: DefId) -> ty::VariantDefData<'tcx, 'tcx> {
449 name: item_name(doc),
450 fields: get_variant_fields(cdata, doc),
451 disr_val: ConstInt::Infer(0),
452 kind: expect_variant_kind(item_family(doc)),
456 let doc = cdata.lookup_item(item_id);
457 let did = DefId { krate: cdata.cnum, index: item_id };
458 let mut ctor_did = None;
459 let (kind, variants) = match item_family(doc) {
462 get_enum_variants(cdata, doc))
465 // Use separate constructor id for unit/tuple structs and reuse did for braced structs.
466 ctor_did = reader::maybe_get_doc(doc, tag_items_data_item_struct_ctor).map(|ctor_doc| {
467 translated_def_id(cdata, ctor_doc)
469 (ty::AdtKind::Struct,
470 vec![get_struct_variant(cdata, doc, ctor_did.unwrap_or(did))])
472 _ => bug!("get_adt_def called on a non-ADT {:?} - {:?}",
473 item_family(doc), did)
476 let adt = tcx.intern_adt_def(did, kind, variants);
477 if let Some(ctor_did) = ctor_did {
478 // Make adt definition available through constructor id as well.
479 tcx.insert_adt_def(ctor_did, adt);
482 // this needs to be done *after* the variant is interned,
483 // to support recursive structures
484 for variant in &adt.variants {
485 if variant.kind == ty::VariantKind::Tuple &&
486 adt.adt_kind() == ty::AdtKind::Enum {
487 // tuple-like enum variant fields aren't real items - get the types
489 debug!("evaluating the ctor-type of {:?}",
491 let ctor_ty = get_type(cdata, variant.did.index, tcx);
492 debug!("evaluating the ctor-type of {:?}.. {:?}",
495 let field_tys = match ctor_ty.sty {
496 ty::TyFnDef(_, _, &ty::BareFnTy { sig: ty::Binder(ty::FnSig {
499 // tuple-struct constructors don't have escaping regions
500 assert!(!inputs.has_escaping_regions());
503 _ => bug!("tuple-variant ctor is not an ADT")
505 for (field, &ty) in variant.fields.iter().zip(field_tys.iter()) {
506 field.fulfill_ty(ty);
509 for field in &variant.fields {
510 debug!("evaluating the type of {:?}::{:?}", variant.name, field.name);
511 let ty = get_type(cdata, field.did.index, tcx);
512 field.fulfill_ty(ty);
513 debug!("evaluating the type of {:?}::{:?}: {:?}",
514 variant.name, field.name, ty);
522 pub fn get_predicates<'a, 'tcx>(cdata: Cmd,
524 tcx: TyCtxt<'a, 'tcx, 'tcx>)
525 -> ty::GenericPredicates<'tcx>
527 let item_doc = cdata.lookup_item(item_id);
528 doc_predicates(item_doc, tcx, cdata, tag_item_predicates)
531 pub fn get_super_predicates<'a, 'tcx>(cdata: Cmd,
533 tcx: TyCtxt<'a, 'tcx, 'tcx>)
534 -> ty::GenericPredicates<'tcx>
536 let item_doc = cdata.lookup_item(item_id);
537 doc_predicates(item_doc, tcx, cdata, tag_item_super_predicates)
540 pub fn get_generics<'a, 'tcx>(cdata: Cmd,
542 tcx: TyCtxt<'a, 'tcx, 'tcx>)
543 -> &'tcx ty::Generics<'tcx>
545 let item_doc = cdata.lookup_item(item_id);
546 doc_generics(item_doc, tcx, cdata)
549 pub fn get_type<'a, 'tcx>(cdata: Cmd, id: DefIndex, tcx: TyCtxt<'a, 'tcx, 'tcx>)
552 let item_doc = cdata.lookup_item(id);
553 doc_type(item_doc, tcx, cdata)
556 pub fn get_stability(cdata: Cmd, id: DefIndex) -> Option<attr::Stability> {
557 let item = cdata.lookup_item(id);
558 reader::maybe_get_doc(item, tag_items_data_item_stability).map(|doc| {
559 let mut decoder = reader::Decoder::new(doc);
560 Decodable::decode(&mut decoder).unwrap()
564 pub fn get_deprecation(cdata: Cmd, id: DefIndex) -> Option<attr::Deprecation> {
565 let item = cdata.lookup_item(id);
566 reader::maybe_get_doc(item, tag_items_data_item_deprecation).map(|doc| {
567 let mut decoder = reader::Decoder::new(doc);
568 Decodable::decode(&mut decoder).unwrap()
572 pub fn get_visibility(cdata: Cmd, id: DefIndex) -> ty::Visibility {
573 item_visibility(cdata.lookup_item(id))
576 pub fn get_parent_impl(cdata: Cmd, id: DefIndex) -> Option<DefId> {
577 let item = cdata.lookup_item(id);
578 reader::maybe_get_doc(item, tag_items_data_parent_impl).map(|doc| {
579 translated_def_id(cdata, doc)
583 pub fn get_repr_attrs(cdata: Cmd, id: DefIndex) -> Vec<attr::ReprAttr> {
584 let item = cdata.lookup_item(id);
585 match reader::maybe_get_doc(item, tag_items_data_item_repr).map(|doc| {
586 let mut decoder = reader::Decoder::new(doc);
587 Decodable::decode(&mut decoder).unwrap()
589 Some(attrs) => attrs,
594 pub fn get_impl_polarity<'tcx>(cdata: Cmd,
596 -> Option<hir::ImplPolarity>
598 let item_doc = cdata.lookup_item(id);
599 let fam = item_family(item_doc);
602 Some(parse_polarity(item_doc))
608 pub fn get_custom_coerce_unsized_kind<'tcx>(
611 -> Option<ty::adjustment::CustomCoerceUnsized>
613 let item_doc = cdata.lookup_item(id);
614 reader::maybe_get_doc(item_doc, tag_impl_coerce_unsized_kind).map(|kind_doc| {
615 let mut decoder = reader::Decoder::new(kind_doc);
616 Decodable::decode(&mut decoder).unwrap()
620 pub fn get_impl_trait<'a, 'tcx>(cdata: Cmd,
622 tcx: TyCtxt<'a, 'tcx, 'tcx>)
623 -> Option<ty::TraitRef<'tcx>>
625 let item_doc = cdata.lookup_item(id);
626 let fam = item_family(item_doc);
628 Family::Impl | Family::DefaultImpl => {
629 reader::maybe_get_doc(item_doc, tag_item_trait_ref).map(|tp| {
630 doc_trait_ref(tp, tcx, cdata)
637 /// Iterates over the language items in the given crate.
638 pub fn each_lang_item<F>(cdata: Cmd, mut f: F) -> bool where
639 F: FnMut(DefIndex, usize) -> bool,
641 let root = rbml::Doc::new(cdata.data());
642 let lang_items = reader::get_doc(root, tag_lang_items);
643 reader::tagged_docs(lang_items, tag_lang_items_item).all(|item_doc| {
644 let id_doc = reader::get_doc(item_doc, tag_lang_items_item_id);
645 let id = reader::doc_as_u32(id_doc) as usize;
646 let index_doc = reader::get_doc(item_doc, tag_lang_items_item_index);
647 let index = DefIndex::from_u32(reader::doc_as_u32(index_doc));
653 fn each_child_of_item_or_crate<F, G>(cdata: Cmd,
655 mut get_crate_data: G,
656 mut callback: F) where
657 F: FnMut(DefLike, ast::Name, ty::Visibility),
658 G: FnMut(ast::CrateNum) -> Rc<CrateMetadata>,
660 // Iterate over all children.
661 for child_info_doc in reader::tagged_docs(item_doc, tag_mod_child) {
662 let child_def_id = translated_def_id(cdata, child_info_doc);
664 // This item may be in yet another crate if it was the child of a
666 let crate_data = if child_def_id.krate == cdata.cnum {
669 Some(get_crate_data(child_def_id.krate))
671 let crate_data = match crate_data {
672 Some(ref cdata) => &**cdata,
677 if let Some(child_item_doc) = crate_data.get_item(child_def_id.index) {
678 // Hand off the item to the callback.
679 let child_name = item_name(child_item_doc);
680 let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id);
681 let visibility = item_visibility(child_item_doc);
682 callback(def_like, child_name, visibility);
686 for reexport_doc in reexports(item_doc) {
687 let def_id_doc = reader::get_doc(reexport_doc,
688 tag_items_data_item_reexport_def_id);
689 let child_def_id = translated_def_id(cdata, def_id_doc);
691 let name_doc = reader::get_doc(reexport_doc,
692 tag_items_data_item_reexport_name);
693 let name = name_doc.as_str_slice();
695 // This reexport may be in yet another crate.
696 let crate_data = if child_def_id.krate == cdata.cnum {
699 Some(get_crate_data(child_def_id.krate))
701 let crate_data = match crate_data {
702 Some(ref cdata) => &**cdata,
707 if let Some(child_item_doc) = crate_data.get_item(child_def_id.index) {
708 // Hand off the item to the callback.
709 let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id);
710 // These items have a public visibility because they're part of
711 // a public re-export.
712 callback(def_like, token::intern(name), ty::Visibility::Public);
717 /// Iterates over each child of the given item.
718 pub fn each_child_of_item<F, G>(cdata: Cmd, id: DefIndex, get_crate_data: G, callback: F)
719 where F: FnMut(DefLike, ast::Name, ty::Visibility),
720 G: FnMut(ast::CrateNum) -> Rc<CrateMetadata>,
723 let item_doc = match cdata.get_item(id) {
725 Some(item_doc) => item_doc,
728 each_child_of_item_or_crate(cdata, item_doc, get_crate_data, callback)
731 /// Iterates over all the top-level crate items.
732 pub fn each_top_level_item_of_crate<F, G>(cdata: Cmd, get_crate_data: G, callback: F)
733 where F: FnMut(DefLike, ast::Name, ty::Visibility),
734 G: FnMut(ast::CrateNum) -> Rc<CrateMetadata>,
736 let root_doc = rbml::Doc::new(cdata.data());
737 let misc_info_doc = reader::get_doc(root_doc, tag_misc_info);
738 let crate_items_doc = reader::get_doc(misc_info_doc,
739 tag_misc_info_crate_items);
741 each_child_of_item_or_crate(cdata,
747 pub fn get_item_name(cdata: Cmd, id: DefIndex) -> ast::Name {
748 item_name(cdata.lookup_item(id))
751 pub fn maybe_get_item_name(cdata: Cmd, id: DefIndex) -> Option<ast::Name> {
752 maybe_item_name(cdata.lookup_item(id))
755 pub enum FoundAst<'ast> {
756 Found(&'ast InlinedItem),
757 FoundParent(DefId, &'ast hir::Item),
761 pub fn maybe_get_item_ast<'a, 'tcx>(cdata: Cmd, tcx: TyCtxt<'a, 'tcx, 'tcx>, id: DefIndex)
763 debug!("Looking up item: {:?}", id);
764 let item_doc = cdata.lookup_item(id);
765 let item_did = item_def_id(item_doc, cdata);
766 let parent_def_id = DefId {
768 index: def_key(cdata, id).parent.unwrap()
770 let mut parent_def_path = def_path(cdata, id);
771 parent_def_path.data.pop();
772 if let Some(ast_doc) = reader::maybe_get_doc(item_doc, tag_ast as usize) {
773 let ii = decode_inlined_item(cdata,
779 return FoundAst::Found(ii);
780 } else if let Some(parent_did) = item_parent_item(cdata, item_doc) {
781 // Remove the last element from the paths, since we are now
782 // trying to inline the parent.
783 let grandparent_def_id = DefId {
785 index: def_key(cdata, parent_def_id.index).parent.unwrap()
787 let mut grandparent_def_path = parent_def_path;
788 grandparent_def_path.data.pop();
789 let parent_doc = cdata.lookup_item(parent_did.index);
790 if let Some(ast_doc) = reader::maybe_get_doc(parent_doc, tag_ast as usize) {
791 let ii = decode_inlined_item(cdata,
793 grandparent_def_path,
797 if let &InlinedItem::Item(_, ref i) = ii {
798 return FoundAst::FoundParent(parent_did, i);
805 pub fn is_item_mir_available<'tcx>(cdata: Cmd, id: DefIndex) -> bool {
806 if let Some(item_doc) = cdata.get_item(id) {
807 return reader::maybe_get_doc(item_doc, tag_mir as usize).is_some();
813 pub fn maybe_get_item_mir<'a, 'tcx>(cdata: Cmd,
814 tcx: TyCtxt<'a, 'tcx, 'tcx>,
816 -> Option<mir::repr::Mir<'tcx>> {
817 let item_doc = cdata.lookup_item(id);
819 return reader::maybe_get_doc(item_doc, tag_mir as usize).map(|mir_doc| {
820 let dcx = tls_context::DecodingContext {
821 crate_metadata: cdata,
824 let mut decoder = reader::Decoder::new(mir_doc);
826 let mut mir = decoder.read_opaque(|opaque_decoder, _| {
827 tls::enter_decoding_context(&dcx, opaque_decoder, |_, opaque_decoder| {
828 Decodable::decode(opaque_decoder)
832 assert!(decoder.position() == mir_doc.end);
834 let mut def_id_and_span_translator = MirDefIdAndSpanTranslator {
835 crate_metadata: cdata,
836 codemap: tcx.sess.codemap(),
837 last_filemap_index_hint: Cell::new(0),
840 def_id_and_span_translator.visit_mir(&mut mir);
841 for promoted in &mut mir.promoted {
842 def_id_and_span_translator.visit_mir(promoted);
848 struct MirDefIdAndSpanTranslator<'cdata, 'codemap> {
849 crate_metadata: Cmd<'cdata>,
850 codemap: &'codemap codemap::CodeMap,
851 last_filemap_index_hint: Cell<usize>
854 impl<'v, 'cdata, 'codemap> mir::visit::MutVisitor<'v>
855 for MirDefIdAndSpanTranslator<'cdata, 'codemap>
857 fn visit_def_id(&mut self, def_id: &mut DefId) {
858 *def_id = translate_def_id(self.crate_metadata, *def_id);
861 fn visit_span(&mut self, span: &mut Span) {
862 *span = translate_span(self.crate_metadata,
864 &self.last_filemap_index_hint,
870 fn get_explicit_self(item: rbml::Doc) -> ty::ExplicitSelfCategory {
871 fn get_mutability(ch: u8) -> hir::Mutability {
873 'i' => hir::MutImmutable,
874 'm' => hir::MutMutable,
875 _ => bug!("unknown mutability character: `{}`", ch as char),
879 let explicit_self_doc = reader::get_doc(item, tag_item_trait_method_explicit_self);
880 let string = explicit_self_doc.as_str_slice();
882 let explicit_self_kind = string.as_bytes()[0];
883 match explicit_self_kind as char {
884 's' => ty::ExplicitSelfCategory::Static,
885 'v' => ty::ExplicitSelfCategory::ByValue,
886 '~' => ty::ExplicitSelfCategory::ByBox,
887 // FIXME(#4846) expl. region
889 ty::ExplicitSelfCategory::ByReference(
891 get_mutability(string.as_bytes()[1]))
893 _ => bug!("unknown self type code: `{}`", explicit_self_kind as char)
897 /// Returns the def IDs of all the items in the given implementation.
898 pub fn get_impl_items(cdata: Cmd, impl_id: DefIndex)
899 -> Vec<ty::ImplOrTraitItemId> {
900 reader::tagged_docs(cdata.lookup_item(impl_id), tag_item_impl_item).map(|doc| {
901 let def_id = item_def_id(doc, cdata);
902 match item_sort(doc) {
903 Some('C') | Some('c') => ty::ConstTraitItemId(def_id),
904 Some('r') | Some('p') => ty::MethodTraitItemId(def_id),
905 Some('t') => ty::TypeTraitItemId(def_id),
906 _ => bug!("unknown impl item sort"),
911 pub fn get_trait_name(cdata: Cmd, id: DefIndex) -> ast::Name {
912 let doc = cdata.lookup_item(id);
916 pub fn is_static_method(cdata: Cmd, id: DefIndex) -> bool {
917 let doc = cdata.lookup_item(id);
918 match item_sort(doc) {
919 Some('r') | Some('p') => {
920 get_explicit_self(doc) == ty::ExplicitSelfCategory::Static
926 pub fn get_impl_or_trait_item<'a, 'tcx>(cdata: Cmd, id: DefIndex, tcx: TyCtxt<'a, 'tcx, 'tcx>)
927 -> Option<ty::ImplOrTraitItem<'tcx>> {
928 let item_doc = cdata.lookup_item(id);
930 let def_id = item_def_id(item_doc, cdata);
932 let container_id = if let Some(id) = item_parent_item(cdata, item_doc) {
937 let container_doc = cdata.lookup_item(container_id.index);
938 let container = match item_family(container_doc) {
939 Trait => TraitContainer(container_id),
940 _ => ImplContainer(container_id),
943 let name = item_name(item_doc);
944 let vis = item_visibility(item_doc);
945 let defaultness = item_defaultness(item_doc);
947 Some(match item_sort(item_doc) {
948 sort @ Some('C') | sort @ Some('c') => {
949 let ty = doc_type(item_doc, tcx, cdata);
950 ty::ConstTraitItem(Rc::new(ty::AssociatedConst {
954 defaultness: defaultness,
956 container: container,
957 has_value: sort == Some('C')
960 Some('r') | Some('p') => {
961 let generics = doc_generics(item_doc, tcx, cdata);
962 let predicates = doc_predicates(item_doc, tcx, cdata, tag_item_predicates);
963 let ity = tcx.lookup_item_type(def_id).ty;
964 let fty = match ity.sty {
965 ty::TyFnDef(_, _, fty) => fty,
967 "the type {:?} of the method {:?} is not a function?",
970 let explicit_self = get_explicit_self(item_doc);
972 ty::MethodTraitItem(Rc::new(ty::Method::new(name,
983 let ty = maybe_doc_type(item_doc, tcx, cdata);
984 ty::TypeTraitItem(Rc::new(ty::AssociatedType {
988 defaultness: defaultness,
990 container: container,
997 pub fn get_trait_item_def_ids(cdata: Cmd, id: DefIndex)
998 -> Vec<ty::ImplOrTraitItemId> {
999 let item = cdata.lookup_item(id);
1000 reader::tagged_docs(item, tag_item_trait_item).map(|mth| {
1001 let def_id = item_def_id(mth, cdata);
1002 match item_sort(mth) {
1003 Some('C') | Some('c') => ty::ConstTraitItemId(def_id),
1004 Some('r') | Some('p') => ty::MethodTraitItemId(def_id),
1005 Some('t') => ty::TypeTraitItemId(def_id),
1006 _ => bug!("unknown trait item sort"),
1011 pub fn get_item_variances(cdata: Cmd, id: DefIndex) -> ty::ItemVariances {
1012 let item_doc = cdata.lookup_item(id);
1013 let variance_doc = reader::get_doc(item_doc, tag_item_variances);
1014 let mut decoder = reader::Decoder::new(variance_doc);
1015 Decodable::decode(&mut decoder).unwrap()
1018 pub fn get_provided_trait_methods<'a, 'tcx>(cdata: Cmd,
1020 tcx: TyCtxt<'a, 'tcx, 'tcx>)
1021 -> Vec<Rc<ty::Method<'tcx>>> {
1022 let item = cdata.lookup_item(id);
1024 reader::tagged_docs(item, tag_item_trait_item).filter_map(|mth_id| {
1025 let did = item_def_id(mth_id, cdata);
1026 let mth = cdata.lookup_item(did.index);
1028 if item_sort(mth) == Some('p') {
1029 let trait_item = get_impl_or_trait_item(cdata, did.index, tcx);
1030 if let Some(ty::MethodTraitItem(ref method)) = trait_item {
1031 Some((*method).clone())
1041 pub fn get_associated_consts<'a, 'tcx>(cdata: Cmd, id: DefIndex, tcx: TyCtxt<'a, 'tcx, 'tcx>)
1042 -> Vec<Rc<ty::AssociatedConst<'tcx>>> {
1043 let item = cdata.lookup_item(id);
1045 [tag_item_trait_item, tag_item_impl_item].iter().flat_map(|&tag| {
1046 reader::tagged_docs(item, tag).filter_map(|ac_id| {
1047 let did = item_def_id(ac_id, cdata);
1048 let ac_doc = cdata.lookup_item(did.index);
1050 match item_sort(ac_doc) {
1051 Some('C') | Some('c') => {
1052 let trait_item = get_impl_or_trait_item(cdata, did.index, tcx);
1053 if let Some(ty::ConstTraitItem(ref ac)) = trait_item {
1065 pub fn get_variant_kind(cdata: Cmd, node_id: DefIndex) -> Option<VariantKind>
1067 let item = cdata.lookup_item(node_id);
1068 family_to_variant_kind(item_family(item))
1071 pub fn get_struct_ctor_def_id(cdata: Cmd, node_id: DefIndex) -> Option<DefId>
1073 let item = cdata.lookup_item(node_id);
1074 reader::maybe_get_doc(item, tag_items_data_item_struct_ctor).
1075 map(|ctor_doc| translated_def_id(cdata, ctor_doc))
1078 /// If node_id is the constructor of a tuple struct, retrieve the NodeId of
1079 /// the actual type definition, otherwise, return None
1080 pub fn get_tuple_struct_definition_if_ctor(cdata: Cmd,
1084 let item = cdata.lookup_item(node_id);
1085 reader::tagged_docs(item, tag_items_data_item_is_tuple_struct_ctor).next().map(|_| {
1086 item_require_parent_item(cdata, item)
1090 pub fn get_item_attrs(cdata: Cmd,
1091 orig_node_id: DefIndex)
1092 -> Vec<ast::Attribute> {
1093 // The attributes for a tuple struct are attached to the definition, not the ctor;
1094 // we assume that someone passing in a tuple struct ctor is actually wanting to
1095 // look at the definition
1096 let node_id = get_tuple_struct_definition_if_ctor(cdata, orig_node_id);
1097 let node_id = node_id.map(|x| x.index).unwrap_or(orig_node_id);
1098 let item = cdata.lookup_item(node_id);
1099 get_attributes(item)
1102 pub fn get_struct_field_attrs(cdata: Cmd) -> FnvHashMap<DefId, Vec<ast::Attribute>> {
1103 let data = rbml::Doc::new(cdata.data());
1104 let fields = reader::get_doc(data, tag_struct_fields);
1105 reader::tagged_docs(fields, tag_struct_field).map(|field| {
1106 let def_id = translated_def_id(cdata, reader::get_doc(field, tag_def_id));
1107 let attrs = get_attributes(field);
1112 fn struct_field_family_to_visibility(family: Family) -> ty::Visibility {
1114 PublicField => ty::Visibility::Public,
1115 InheritedField => ty::Visibility::PrivateExternal,
1120 pub fn get_struct_field_names(cdata: Cmd, id: DefIndex) -> Vec<ast::Name> {
1121 let item = cdata.lookup_item(id);
1123 reader::tagged_docs(item, tag_item_field).map(|an_item| {
1125 }).chain(reader::tagged_docs(item, tag_item_unnamed_field).map(|_| {
1126 let name = token::with_ident_interner(|interner| interner.intern(index.to_string()));
1132 fn get_meta_items(md: rbml::Doc) -> Vec<P<ast::MetaItem>> {
1133 reader::tagged_docs(md, tag_meta_item_word).map(|meta_item_doc| {
1134 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1135 let n = token::intern_and_get_ident(nd.as_str_slice());
1136 attr::mk_word_item(n)
1137 }).chain(reader::tagged_docs(md, tag_meta_item_name_value).map(|meta_item_doc| {
1138 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1139 let vd = reader::get_doc(meta_item_doc, tag_meta_item_value);
1140 let n = token::intern_and_get_ident(nd.as_str_slice());
1141 let v = token::intern_and_get_ident(vd.as_str_slice());
1142 // FIXME (#623): Should be able to decode MetaItemKind::NameValue variants,
1143 // but currently the encoder just drops them
1144 attr::mk_name_value_item_str(n, v)
1145 })).chain(reader::tagged_docs(md, tag_meta_item_list).map(|meta_item_doc| {
1146 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1147 let n = token::intern_and_get_ident(nd.as_str_slice());
1148 let subitems = get_meta_items(meta_item_doc);
1149 attr::mk_list_item(n, subitems)
1153 fn get_attributes(md: rbml::Doc) -> Vec<ast::Attribute> {
1154 match reader::maybe_get_doc(md, tag_attributes) {
1156 reader::tagged_docs(attrs_d, tag_attribute).map(|attr_doc| {
1157 let is_sugared_doc = reader::doc_as_u8(
1158 reader::get_doc(attr_doc, tag_attribute_is_sugared_doc)
1160 let meta_items = get_meta_items(attr_doc);
1161 // Currently it's only possible to have a single meta item on
1163 assert_eq!(meta_items.len(), 1);
1164 let meta_item = meta_items.into_iter().nth(0).unwrap();
1165 attr::mk_doc_attr_outer(attr::mk_attr_id(), meta_item, is_sugared_doc)
1172 fn list_crate_attributes(md: rbml::Doc, hash: &Svh,
1173 out: &mut io::Write) -> io::Result<()> {
1174 write!(out, "=Crate Attributes ({})=\n", *hash)?;
1176 let r = get_attributes(md);
1178 write!(out, "{}\n", pprust::attribute_to_string(attr))?;
1184 pub fn get_crate_attributes(data: &[u8]) -> Vec<ast::Attribute> {
1185 get_attributes(rbml::Doc::new(data))
1189 pub struct CrateDep {
1190 pub cnum: ast::CrateNum,
1193 pub explicitly_linked: bool,
1196 pub fn get_crate_deps(data: &[u8]) -> Vec<CrateDep> {
1197 let cratedoc = rbml::Doc::new(data);
1198 let depsdoc = reader::get_doc(cratedoc, tag_crate_deps);
1200 fn docstr(doc: rbml::Doc, tag_: usize) -> String {
1201 let d = reader::get_doc(doc, tag_);
1202 d.as_str_slice().to_string()
1205 reader::tagged_docs(depsdoc, tag_crate_dep).enumerate().map(|(crate_num, depdoc)| {
1206 let name = docstr(depdoc, tag_crate_dep_crate_name);
1207 let hash = Svh::new(reader::doc_as_u64(reader::get_doc(depdoc, tag_crate_dep_hash)));
1208 let doc = reader::get_doc(depdoc, tag_crate_dep_explicitly_linked);
1209 let explicitly_linked = reader::doc_as_u8(doc) != 0;
1211 cnum: crate_num as u32 + 1,
1214 explicitly_linked: explicitly_linked,
1219 fn list_crate_deps(data: &[u8], out: &mut io::Write) -> io::Result<()> {
1220 write!(out, "=External Dependencies=\n")?;
1221 for dep in &get_crate_deps(data) {
1222 write!(out, "{} {}-{}\n", dep.cnum, dep.name, dep.hash)?;
1228 pub fn maybe_get_crate_hash(data: &[u8]) -> Option<Svh> {
1229 let cratedoc = rbml::Doc::new(data);
1230 reader::maybe_get_doc(cratedoc, tag_crate_hash).map(|doc| {
1231 Svh::new(reader::doc_as_u64(doc))
1235 pub fn get_crate_hash(data: &[u8]) -> Svh {
1236 let cratedoc = rbml::Doc::new(data);
1237 let hashdoc = reader::get_doc(cratedoc, tag_crate_hash);
1238 Svh::new(reader::doc_as_u64(hashdoc))
1241 pub fn maybe_get_crate_name(data: &[u8]) -> Option<&str> {
1242 let cratedoc = rbml::Doc::new(data);
1243 reader::maybe_get_doc(cratedoc, tag_crate_crate_name).map(|doc| {
1248 pub fn get_crate_disambiguator<'a>(data: &'a [u8]) -> &'a str {
1249 let crate_doc = rbml::Doc::new(data);
1250 let disambiguator_doc = reader::get_doc(crate_doc, tag_crate_disambiguator);
1251 let slice: &'a str = disambiguator_doc.as_str_slice();
1255 pub fn get_crate_triple(data: &[u8]) -> Option<String> {
1256 let cratedoc = rbml::Doc::new(data);
1257 let triple_doc = reader::maybe_get_doc(cratedoc, tag_crate_triple);
1258 triple_doc.map(|s| s.as_str().to_string())
1261 pub fn get_crate_name(data: &[u8]) -> &str {
1262 maybe_get_crate_name(data).expect("no crate name in crate")
1265 pub fn list_crate_metadata(bytes: &[u8], out: &mut io::Write) -> io::Result<()> {
1266 let hash = get_crate_hash(bytes);
1267 let md = rbml::Doc::new(bytes);
1268 list_crate_attributes(md, &hash, out)?;
1269 list_crate_deps(bytes, out)
1272 // Translates a def_id from an external crate to a def_id for the current
1273 // compilation environment. We use this when trying to load types from
1274 // external crates - if those types further refer to types in other crates
1275 // then we must translate the crate number from that encoded in the external
1276 // crate to the correct local crate number.
1277 pub fn translate_def_id(cdata: Cmd, did: DefId) -> DefId {
1279 return DefId { krate: cdata.cnum, index: did.index };
1283 krate: cdata.cnum_map.borrow()[did.krate],
1288 // Translate a DefId from the current compilation environment to a DefId
1289 // for an external crate.
1290 fn reverse_translate_def_id(cdata: Cmd, did: DefId) -> Option<DefId> {
1291 for (local, &global) in cdata.cnum_map.borrow().iter_enumerated() {
1292 if global == did.krate {
1293 return Some(DefId { krate: local, index: did.index });
1300 /// Translates a `Span` from an extern crate to the corresponding `Span`
1301 /// within the local crate's codemap.
1302 pub fn translate_span(cdata: Cmd,
1303 codemap: &codemap::CodeMap,
1304 last_filemap_index_hint: &Cell<usize>,
1305 span: syntax_pos::Span)
1306 -> syntax_pos::Span {
1307 let span = if span.lo > span.hi {
1308 // Currently macro expansion sometimes produces invalid Span values
1309 // where lo > hi. In order not to crash the compiler when trying to
1310 // translate these values, let's transform them into something we
1311 // can handle (and which will produce useful debug locations at
1312 // least some of the time).
1313 // This workaround is only necessary as long as macro expansion is
1314 // not fixed. FIXME(#23480)
1315 syntax_pos::mk_sp(span.lo, span.lo)
1320 let imported_filemaps = cdata.imported_filemaps(&codemap);
1322 // Optimize for the case that most spans within a translated item
1323 // originate from the same filemap.
1324 let last_filemap_index = last_filemap_index_hint.get();
1325 let last_filemap = &imported_filemaps[last_filemap_index];
1327 if span.lo >= last_filemap.original_start_pos &&
1328 span.lo <= last_filemap.original_end_pos &&
1329 span.hi >= last_filemap.original_start_pos &&
1330 span.hi <= last_filemap.original_end_pos {
1334 let mut b = imported_filemaps.len();
1337 let m = (a + b) / 2;
1338 if imported_filemaps[m].original_start_pos > span.lo {
1345 last_filemap_index_hint.set(a);
1346 &imported_filemaps[a]
1350 let lo = (span.lo - filemap.original_start_pos) +
1351 filemap.translated_filemap.start_pos;
1352 let hi = (span.hi - filemap.original_start_pos) +
1353 filemap.translated_filemap.start_pos;
1355 syntax_pos::mk_sp(lo, hi)
1358 pub fn each_inherent_implementation_for_type<F>(cdata: Cmd,
1361 where F: FnMut(DefId),
1363 let item_doc = cdata.lookup_item(id);
1364 for impl_doc in reader::tagged_docs(item_doc, tag_items_data_item_inherent_impl) {
1365 if reader::maybe_get_doc(impl_doc, tag_item_trait_ref).is_none() {
1366 callback(item_def_id(impl_doc, cdata));
1371 pub fn each_implementation_for_trait<F>(cdata: Cmd,
1373 mut callback: F) where
1376 // Do a reverse lookup beforehand to avoid touching the crate_num
1377 // hash map in the loop below.
1378 if let Some(crate_local_did) = reverse_translate_def_id(cdata, def_id) {
1379 let def_id_u64 = def_to_u64(crate_local_did);
1381 let impls_doc = reader::get_doc(rbml::Doc::new(cdata.data()), tag_impls);
1382 for trait_doc in reader::tagged_docs(impls_doc, tag_impls_trait) {
1383 let trait_def_id = reader::get_doc(trait_doc, tag_def_id);
1384 if reader::doc_as_u64(trait_def_id) != def_id_u64 {
1387 for impl_doc in reader::tagged_docs(trait_doc, tag_impls_trait_impl) {
1388 callback(translated_def_id(cdata, impl_doc));
1394 pub fn get_trait_of_item(cdata: Cmd, id: DefIndex) -> Option<DefId> {
1395 let item_doc = cdata.lookup_item(id);
1396 let parent_item_id = match item_parent_item(cdata, item_doc) {
1397 None => return None,
1398 Some(item_id) => item_id,
1400 let parent_item_doc = cdata.lookup_item(parent_item_id.index);
1401 match item_family(parent_item_doc) {
1402 Trait => Some(item_def_id(parent_item_doc, cdata)),
1408 pub fn get_native_libraries(cdata: Cmd)
1409 -> Vec<(cstore::NativeLibraryKind, String)> {
1410 let libraries = reader::get_doc(rbml::Doc::new(cdata.data()),
1411 tag_native_libraries);
1412 reader::tagged_docs(libraries, tag_native_libraries_lib).map(|lib_doc| {
1413 let kind_doc = reader::get_doc(lib_doc, tag_native_libraries_kind);
1414 let name_doc = reader::get_doc(lib_doc, tag_native_libraries_name);
1415 let kind: cstore::NativeLibraryKind =
1416 cstore::NativeLibraryKind::from_u32(reader::doc_as_u32(kind_doc)).unwrap();
1417 let name = name_doc.as_str().to_string();
1422 pub fn get_plugin_registrar_fn(data: &[u8]) -> Option<DefIndex> {
1423 reader::maybe_get_doc(rbml::Doc::new(data), tag_plugin_registrar_fn)
1424 .map(|doc| DefIndex::from_u32(reader::doc_as_u32(doc)))
1427 pub fn each_exported_macro<F>(data: &[u8], mut f: F) where
1428 F: FnMut(ast::Name, Vec<ast::Attribute>, Span, String) -> bool,
1430 let macros = reader::get_doc(rbml::Doc::new(data), tag_macro_defs);
1431 for macro_doc in reader::tagged_docs(macros, tag_macro_def) {
1432 let name = item_name(macro_doc);
1433 let attrs = get_attributes(macro_doc);
1434 let span = get_macro_span(macro_doc);
1435 let body = reader::get_doc(macro_doc, tag_macro_def_body);
1436 if !f(name, attrs, span, body.as_str().to_string()) {
1442 pub fn get_macro_span(doc: rbml::Doc) -> Span {
1443 let lo_doc = reader::get_doc(doc, tag_macro_def_span_lo);
1444 let lo = BytePos(reader::doc_as_u32(lo_doc));
1445 let hi_doc = reader::get_doc(doc, tag_macro_def_span_hi);
1446 let hi = BytePos(reader::doc_as_u32(hi_doc));
1447 return Span { lo: lo, hi: hi, expn_id: NO_EXPANSION };
1450 pub fn get_dylib_dependency_formats(cdata: Cmd)
1451 -> Vec<(ast::CrateNum, LinkagePreference)>
1453 let formats = reader::get_doc(rbml::Doc::new(cdata.data()),
1454 tag_dylib_dependency_formats);
1455 let mut result = Vec::new();
1457 debug!("found dylib deps: {}", formats.as_str_slice());
1458 for spec in formats.as_str_slice().split(',') {
1459 if spec.is_empty() { continue }
1460 let cnum = spec.split(':').nth(0).unwrap();
1461 let link = spec.split(':').nth(1).unwrap();
1462 let cnum: ast::CrateNum = cnum.parse().unwrap();
1463 let cnum = cdata.cnum_map.borrow()[cnum];
1464 result.push((cnum, if link == "d" {
1465 LinkagePreference::RequireDynamic
1467 LinkagePreference::RequireStatic
1473 pub fn get_missing_lang_items(cdata: Cmd)
1474 -> Vec<lang_items::LangItem>
1476 let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_lang_items);
1477 reader::tagged_docs(items, tag_lang_items_missing).map(|missing_docs| {
1478 lang_items::LangItem::from_u32(reader::doc_as_u32(missing_docs)).unwrap()
1482 pub fn get_method_arg_names(cdata: Cmd, id: DefIndex) -> Vec<String> {
1483 let method_doc = cdata.lookup_item(id);
1484 match reader::maybe_get_doc(method_doc, tag_method_argument_names) {
1486 reader::tagged_docs(args_doc, tag_method_argument_name).map(|name_doc| {
1487 name_doc.as_str_slice().to_string()
1494 pub fn get_reachable_ids(cdata: Cmd) -> Vec<DefId> {
1495 let items = reader::get_doc(rbml::Doc::new(cdata.data()),
1497 reader::tagged_docs(items, tag_reachable_id).map(|doc| {
1500 index: DefIndex::from_u32(reader::doc_as_u32(doc)),
1505 pub fn is_typedef(cdata: Cmd, id: DefIndex) -> bool {
1506 let item_doc = cdata.lookup_item(id);
1507 match item_family(item_doc) {
1513 pub fn is_const_fn(cdata: Cmd, id: DefIndex) -> bool {
1514 let item_doc = cdata.lookup_item(id);
1515 match fn_constness(item_doc) {
1516 hir::Constness::Const => true,
1517 hir::Constness::NotConst => false,
1521 pub fn is_extern_item<'a, 'tcx>(cdata: Cmd,
1523 tcx: TyCtxt<'a, 'tcx, 'tcx>)
1525 let item_doc = match cdata.get_item(id) {
1527 None => return false,
1529 let applicable = match item_family(item_doc) {
1530 ImmStatic | MutStatic => true,
1531 Fn => get_generics(cdata, id, tcx).types.is_empty(),
1536 attr::contains_extern_indicator(tcx.sess.diagnostic(),
1537 &get_attributes(item_doc))
1543 pub fn is_foreign_item(cdata: Cmd, id: DefIndex) -> bool {
1544 let item_doc = cdata.lookup_item(id);
1545 let parent_item_id = match item_parent_item(cdata, item_doc) {
1546 None => return false,
1547 Some(item_id) => item_id,
1549 let parent_item_doc = cdata.lookup_item(parent_item_id.index);
1550 item_family(parent_item_doc) == ForeignMod
1553 pub fn is_impl(cdata: Cmd, id: DefIndex) -> bool {
1554 let item_doc = cdata.lookup_item(id);
1555 match item_family(item_doc) {
1561 fn doc_generics<'a, 'tcx>(base_doc: rbml::Doc,
1562 tcx: TyCtxt<'a, 'tcx, 'tcx>,
1564 -> &'tcx ty::Generics<'tcx>
1566 let doc = reader::get_doc(base_doc, tag_item_generics);
1567 TyDecoder::with_doc(tcx, cdata.cnum, doc,
1568 &mut |did| translate_def_id(cdata, did))
1572 fn doc_predicate<'a, 'tcx>(cdata: Cmd,
1574 tcx: TyCtxt<'a, 'tcx, 'tcx>)
1575 -> ty::Predicate<'tcx>
1577 let predicate_pos = cdata.xref_index.lookup(
1578 cdata.data(), reader::doc_as_u32(doc)).unwrap() as usize;
1580 cdata.data(), cdata.cnum, predicate_pos, tcx,
1581 &mut |did| translate_def_id(cdata, did)
1585 fn doc_predicates<'a, 'tcx>(base_doc: rbml::Doc,
1586 tcx: TyCtxt<'a, 'tcx, 'tcx>,
1589 -> ty::GenericPredicates<'tcx>
1591 let doc = reader::get_doc(base_doc, tag);
1593 ty::GenericPredicates {
1594 parent: item_parent_item(cdata, doc),
1595 predicates: reader::tagged_docs(doc, tag_predicate).map(|predicate_doc| {
1596 doc_predicate(cdata, predicate_doc, tcx)
1601 pub fn is_defaulted_trait(cdata: Cmd, trait_id: DefIndex) -> bool {
1602 let trait_doc = cdata.lookup_item(trait_id);
1603 assert!(item_family(trait_doc) == Family::Trait);
1604 let defaulted_doc = reader::get_doc(trait_doc, tag_defaulted_trait);
1605 reader::doc_as_u8(defaulted_doc) != 0
1608 pub fn is_default_impl(cdata: Cmd, impl_id: DefIndex) -> bool {
1609 let impl_doc = cdata.lookup_item(impl_id);
1610 item_family(impl_doc) == Family::DefaultImpl
1613 pub fn get_imported_filemaps(metadata: &[u8]) -> Vec<syntax_pos::FileMap> {
1614 let crate_doc = rbml::Doc::new(metadata);
1615 let cm_doc = reader::get_doc(crate_doc, tag_codemap);
1617 reader::tagged_docs(cm_doc, tag_codemap_filemap).map(|filemap_doc| {
1618 let mut decoder = reader::Decoder::new(filemap_doc);
1619 decoder.read_opaque(|opaque_decoder, _| {
1620 Decodable::decode(opaque_decoder)
1625 pub fn closure_kind(cdata: Cmd, closure_id: DefIndex) -> ty::ClosureKind {
1626 let closure_doc = cdata.lookup_item(closure_id);
1627 let closure_kind_doc = reader::get_doc(closure_doc, tag_items_closure_kind);
1628 let mut decoder = reader::Decoder::new(closure_kind_doc);
1629 ty::ClosureKind::decode(&mut decoder).unwrap()
1632 pub fn closure_ty<'a, 'tcx>(cdata: Cmd, closure_id: DefIndex, tcx: TyCtxt<'a, 'tcx, 'tcx>)
1633 -> ty::ClosureTy<'tcx> {
1634 let closure_doc = cdata.lookup_item(closure_id);
1635 let closure_ty_doc = reader::get_doc(closure_doc, tag_items_closure_ty);
1636 TyDecoder::with_doc(tcx, cdata.cnum, closure_ty_doc, &mut |did| translate_def_id(cdata, did))
1640 pub fn def_key(cdata: Cmd, id: DefIndex) -> hir_map::DefKey {
1641 debug!("def_key: id={:?}", id);
1642 let item_doc = cdata.lookup_item(id);
1643 item_def_key(item_doc)
1646 fn item_def_key(item_doc: rbml::Doc) -> hir_map::DefKey {
1647 match reader::maybe_get_doc(item_doc, tag_def_key) {
1648 Some(def_key_doc) => {
1649 let mut decoder = reader::Decoder::new(def_key_doc);
1650 let simple_key = def_key::DefKey::decode(&mut decoder).unwrap();
1651 let name = reader::maybe_get_doc(item_doc, tag_paths_data_name).map(|name| {
1652 token::intern(name.as_str_slice()).as_str()
1654 def_key::recover_def_key(simple_key, name)
1657 bug!("failed to find block with tag {:?} for item with family {:?}",
1659 item_family(item_doc))
1664 pub fn def_path(cdata: Cmd, id: DefIndex) -> hir_map::DefPath {
1665 debug!("def_path(id={:?})", id);
1666 hir_map::DefPath::make(cdata.cnum, id, |parent| def_key(cdata, parent))
1669 pub fn get_panic_strategy(data: &[u8]) -> PanicStrategy {
1670 let crate_doc = rbml::Doc::new(data);
1671 let strat_doc = reader::get_doc(crate_doc, tag_panic_strategy);
1672 match reader::doc_as_u8(strat_doc) {
1673 b'U' => PanicStrategy::Unwind,
1674 b'A' => PanicStrategy::Abort,
1675 b => panic!("unknown panic strategy in metadata: {}", b),