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)]
15 pub use self::DefLike::*;
18 use front::map as ast_map;
19 use rustc_front::print::pprust;
23 use metadata::cstore::crate_metadata;
24 use metadata::common::*;
25 use metadata::csearch::MethodInfo;
26 use metadata::csearch;
28 use metadata::encoder::def_to_u64;
30 use metadata::inline::InlinedItem;
31 use metadata::tydecode::TyDecoder;
33 use middle::def_id::{DefId, LOCAL_CRATE};
34 use middle::lang_items;
36 use middle::ty::{ImplContainer, TraitContainer};
37 use middle::ty::{self, RegionEscape, Ty};
38 use util::nodemap::FnvHashMap;
40 use std::cell::{Cell, RefCell};
41 use std::io::prelude::*;
48 use serialize::Decodable;
49 use rustc_front::attr;
50 use syntax::parse::token::{IdentInterner, special_idents};
51 use syntax::parse::token;
58 pub type Cmd<'a> = &'a crate_metadata;
61 fn get_item(&self, item_id: ast::NodeId) -> Option<rbml::Doc> {
62 self.index.lookup_item(self.data(), item_id).map(|pos| {
63 reader::doc_at(self.data(), pos as usize).unwrap().doc
67 fn lookup_item(&self, item_id: ast::NodeId) -> rbml::Doc {
68 match self.get_item(item_id) {
69 None => panic!("lookup_item: id not found: {}", item_id),
75 pub fn load_index(data: &[u8]) -> index::Index {
76 let index = reader::get_doc(rbml::Doc::new(data), tag_index);
77 index::Index::from_buf(index.data, index.start, index.end)
80 #[derive(Debug, PartialEq)]
103 fn item_family(item: rbml::Doc) -> Family {
104 let fam = reader::get_doc(item, tag_items_data_item_family);
105 match reader::doc_as_u8(fam) as char {
118 'V' => StructVariant,
124 'N' => InheritedField,
125 c => panic!("unexpected family char: {}", c)
129 fn item_visibility(item: rbml::Doc) -> hir::Visibility {
130 match reader::maybe_get_doc(item, tag_items_data_item_visibility) {
132 Some(visibility_doc) => {
133 match reader::doc_as_u8(visibility_doc) as char {
135 'i' => hir::Inherited,
136 _ => panic!("unknown visibility character")
142 fn fn_constness(item: rbml::Doc) -> hir::Constness {
143 match reader::maybe_get_doc(item, tag_items_data_item_constness) {
144 None => hir::Constness::NotConst,
145 Some(constness_doc) => {
146 match reader::doc_as_u8(constness_doc) as char {
147 'c' => hir::Constness::Const,
148 'n' => hir::Constness::NotConst,
149 _ => panic!("unknown constness character")
155 fn item_sort(item: rbml::Doc) -> Option<char> {
156 reader::tagged_docs(item, tag_item_trait_item_sort).nth(0).map(|doc| {
157 doc.as_str_slice().as_bytes()[0] as char
161 fn item_symbol(item: rbml::Doc) -> String {
162 reader::get_doc(item, tag_items_data_item_symbol).as_str().to_string()
165 fn translated_def_id(cdata: Cmd, d: rbml::Doc) -> DefId {
166 let id = reader::doc_as_u64(d);
167 let def_id = DefId { krate: (id >> 32) as u32, node: id as u32 };
168 translate_def_id(cdata, def_id)
171 fn item_parent_item(cdata: Cmd, d: rbml::Doc) -> Option<DefId> {
172 reader::tagged_docs(d, tag_items_data_parent_item).nth(0).map(|did| {
173 translated_def_id(cdata, did)
177 fn item_require_parent_item(cdata: Cmd, d: rbml::Doc) -> DefId {
178 translated_def_id(cdata, reader::get_doc(d, tag_items_data_parent_item))
181 fn item_def_id(d: rbml::Doc, cdata: Cmd) -> DefId {
182 translated_def_id(cdata, reader::get_doc(d, tag_def_id))
185 fn get_provided_source(d: rbml::Doc, cdata: Cmd) -> Option<DefId> {
186 reader::maybe_get_doc(d, tag_item_method_provided_source).map(|doc| {
187 translated_def_id(cdata, doc)
191 fn reexports<'a>(d: rbml::Doc<'a>) -> reader::TaggedDocsIterator<'a> {
192 reader::tagged_docs(d, tag_items_data_item_reexport)
195 fn variant_disr_val(d: rbml::Doc) -> Option<ty::Disr> {
196 reader::maybe_get_doc(d, tag_disr_val).and_then(|val_doc| {
197 reader::with_doc_data(val_doc, |data| {
198 str::from_utf8(data).ok().and_then(|s| s.parse().ok())
203 fn doc_type<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> Ty<'tcx> {
204 let tp = reader::get_doc(doc, tag_items_data_item_type);
205 TyDecoder::with_doc(tcx, cdata.cnum, tp,
206 &mut |_, did| translate_def_id(cdata, did))
210 fn maybe_doc_type<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> Option<Ty<'tcx>> {
211 reader::maybe_get_doc(doc, tag_items_data_item_type).map(|tp| {
212 TyDecoder::with_doc(tcx, cdata.cnum, tp,
213 &mut |_, did| translate_def_id(cdata, did))
218 fn doc_method_fty<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>,
219 cdata: Cmd) -> ty::BareFnTy<'tcx> {
220 let tp = reader::get_doc(doc, tag_item_method_fty);
221 TyDecoder::with_doc(tcx, cdata.cnum, tp,
222 &mut |_, did| translate_def_id(cdata, did))
226 pub fn item_type<'tcx>(_item_id: DefId, item: rbml::Doc,
227 tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> Ty<'tcx> {
228 doc_type(item, tcx, cdata)
231 fn doc_trait_ref<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd)
232 -> ty::TraitRef<'tcx> {
233 TyDecoder::with_doc(tcx, cdata.cnum, doc,
234 &mut |_, did| translate_def_id(cdata, did))
238 fn item_trait_ref<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd)
239 -> ty::TraitRef<'tcx> {
240 let tp = reader::get_doc(doc, tag_item_trait_ref);
241 doc_trait_ref(tp, tcx, cdata)
244 fn item_path(item_doc: rbml::Doc) -> Vec<ast_map::PathElem> {
245 let path_doc = reader::get_doc(item_doc, tag_path);
246 reader::docs(path_doc).filter_map(|(tag, elt_doc)| {
247 if tag == tag_path_elem_mod {
248 let s = elt_doc.as_str_slice();
249 Some(ast_map::PathMod(token::intern(s)))
250 } else if tag == tag_path_elem_name {
251 let s = elt_doc.as_str_slice();
252 Some(ast_map::PathName(token::intern(s)))
254 // ignore tag_path_len element
260 fn item_name(intr: &IdentInterner, item: rbml::Doc) -> ast::Name {
261 let name = reader::get_doc(item, tag_paths_data_name);
262 let string = name.as_str_slice();
263 match intr.find(string) {
264 None => token::intern(string),
269 fn item_to_def_like(cdata: Cmd, item: rbml::Doc, did: DefId) -> DefLike {
270 let fam = item_family(item);
273 // Check whether we have an associated const item.
274 if item_sort(item) == Some('C') {
275 DlDef(def::DefAssociatedConst(did))
277 // Regular const item.
278 DlDef(def::DefConst(did))
281 ImmStatic => DlDef(def::DefStatic(did, false)),
282 MutStatic => DlDef(def::DefStatic(did, true)),
283 Struct => DlDef(def::DefStruct(did)),
284 Fn => DlDef(def::DefFn(did, false)),
285 CtorFn => DlDef(def::DefFn(did, true)),
286 Method | StaticMethod => {
287 DlDef(def::DefMethod(did))
290 if item_sort(item) == Some('t') {
291 let trait_did = item_require_parent_item(cdata, item);
292 DlDef(def::DefAssociatedTy(trait_did, did))
294 DlDef(def::DefTy(did, false))
297 Mod => DlDef(def::DefMod(did)),
298 ForeignMod => DlDef(def::DefForeignMod(did)),
300 let enum_did = item_require_parent_item(cdata, item);
301 DlDef(def::DefVariant(enum_did, did, true))
304 let enum_did = item_require_parent_item(cdata, item);
305 DlDef(def::DefVariant(enum_did, did, false))
307 Trait => DlDef(def::DefTrait(did)),
308 Enum => DlDef(def::DefTy(did, true)),
309 Impl | DefaultImpl => DlImpl(did),
310 PublicField | InheritedField => DlField,
314 fn parse_unsafety(item_doc: rbml::Doc) -> hir::Unsafety {
315 let unsafety_doc = reader::get_doc(item_doc, tag_unsafety);
316 if reader::doc_as_u8(unsafety_doc) != 0 {
317 hir::Unsafety::Unsafe
319 hir::Unsafety::Normal
323 fn parse_paren_sugar(item_doc: rbml::Doc) -> bool {
324 let paren_sugar_doc = reader::get_doc(item_doc, tag_paren_sugar);
325 reader::doc_as_u8(paren_sugar_doc) != 0
328 fn parse_polarity(item_doc: rbml::Doc) -> hir::ImplPolarity {
329 let polarity_doc = reader::get_doc(item_doc, tag_polarity);
330 if reader::doc_as_u8(polarity_doc) != 0 {
331 hir::ImplPolarity::Negative
333 hir::ImplPolarity::Positive
337 fn parse_associated_type_names(item_doc: rbml::Doc) -> Vec<ast::Name> {
338 let names_doc = reader::get_doc(item_doc, tag_associated_type_names);
339 reader::tagged_docs(names_doc, tag_associated_type_name)
340 .map(|name_doc| token::intern(name_doc.as_str_slice()))
344 pub fn get_trait_def<'tcx>(cdata: Cmd,
345 item_id: ast::NodeId,
346 tcx: &ty::ctxt<'tcx>) -> ty::TraitDef<'tcx>
348 let item_doc = cdata.lookup_item(item_id);
349 let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
350 let unsafety = parse_unsafety(item_doc);
351 let associated_type_names = parse_associated_type_names(item_doc);
352 let paren_sugar = parse_paren_sugar(item_doc);
355 paren_sugar: paren_sugar,
358 trait_ref: item_trait_ref(item_doc, tcx, cdata),
359 associated_type_names: associated_type_names,
360 nonblanket_impls: RefCell::new(FnvHashMap()),
361 blanket_impls: RefCell::new(vec![]),
362 flags: Cell::new(ty::TraitFlags::NO_TRAIT_FLAGS)
366 pub fn get_adt_def<'tcx>(intr: &IdentInterner,
368 item_id: ast::NodeId,
369 tcx: &ty::ctxt<'tcx>) -> ty::AdtDefMaster<'tcx>
371 fn get_enum_variants<'tcx>(intr: &IdentInterner,
374 tcx: &ty::ctxt<'tcx>) -> Vec<ty::VariantDefData<'tcx, 'tcx>> {
375 let mut disr_val = 0;
376 reader::tagged_docs(doc, tag_items_data_item_variant).map(|p| {
377 let did = translated_def_id(cdata, p);
378 let item = cdata.lookup_item(did.node);
380 if let Some(disr) = variant_disr_val(item) {
384 disr_val = disr_val.wrapping_add(1);
388 name: item_name(intr, item),
389 fields: get_variant_fields(intr, cdata, item, tcx),
394 fn get_variant_fields<'tcx>(intr: &IdentInterner,
397 tcx: &ty::ctxt<'tcx>) -> Vec<ty::FieldDefData<'tcx, 'tcx>> {
398 reader::tagged_docs(doc, tag_item_field).map(|f| {
399 let ff = item_family(f);
401 PublicField | InheritedField => {},
402 _ => tcx.sess.bug(&format!("expected field, found {:?}", ff))
404 ty::FieldDefData::new(item_def_id(f, cdata),
406 struct_field_family_to_visibility(ff))
407 }).chain(reader::tagged_docs(doc, tag_item_unnamed_field).map(|f| {
408 let ff = item_family(f);
409 ty::FieldDefData::new(item_def_id(f, cdata),
410 special_idents::unnamed_field.name,
411 struct_field_family_to_visibility(ff))
414 fn get_struct_variant<'tcx>(intr: &IdentInterner,
418 tcx: &ty::ctxt<'tcx>) -> ty::VariantDefData<'tcx, 'tcx> {
421 name: item_name(intr, doc),
422 fields: get_variant_fields(intr, cdata, doc, tcx),
427 let doc = cdata.lookup_item(item_id);
428 let did = DefId { krate: cdata.cnum, node: item_id };
429 let (kind, variants) = match item_family(doc) {
430 Enum => (ty::AdtKind::Enum,
431 get_enum_variants(intr, cdata, doc, tcx)),
432 Struct => (ty::AdtKind::Struct,
433 vec![get_struct_variant(intr, cdata, doc, did, tcx)]),
434 _ => tcx.sess.bug("get_adt_def called on a non-ADT")
437 let adt = tcx.intern_adt_def(did, kind, variants);
439 // this needs to be done *after* the variant is interned,
440 // to support recursive structures
441 for variant in &adt.variants {
442 if variant.kind() == ty::VariantKind::Tuple &&
443 adt.adt_kind() == ty::AdtKind::Enum {
444 // tuple-like enum variant fields aren't real items - get the types
446 debug!("evaluating the ctor-type of {:?}",
448 let ctor_ty = get_type(cdata, variant.did.node, tcx).ty;
449 debug!("evaluating the ctor-type of {:?}.. {:?}",
452 let field_tys = match ctor_ty.sty {
453 ty::TyBareFn(_, &ty::BareFnTy { sig: ty::Binder(ty::FnSig {
456 // tuple-struct constructors don't have escaping regions
457 assert!(!inputs.has_escaping_regions());
460 _ => tcx.sess.bug("tuple-variant ctor is not an ADT")
462 for (field, &ty) in variant.fields.iter().zip(field_tys.iter()) {
463 field.fulfill_ty(ty);
466 for field in &variant.fields {
467 debug!("evaluating the type of {:?}::{:?}", variant.name, field.name);
468 let ty = get_type(cdata, field.did.node, tcx).ty;
469 field.fulfill_ty(ty);
470 debug!("evaluating the type of {:?}::{:?}: {:?}",
471 variant.name, field.name, ty);
479 pub fn get_predicates<'tcx>(cdata: Cmd,
480 item_id: ast::NodeId,
481 tcx: &ty::ctxt<'tcx>)
482 -> ty::GenericPredicates<'tcx>
484 let item_doc = cdata.lookup_item(item_id);
485 doc_predicates(item_doc, tcx, cdata, tag_item_generics)
488 pub fn get_super_predicates<'tcx>(cdata: Cmd,
489 item_id: ast::NodeId,
490 tcx: &ty::ctxt<'tcx>)
491 -> ty::GenericPredicates<'tcx>
493 let item_doc = cdata.lookup_item(item_id);
494 doc_predicates(item_doc, tcx, cdata, tag_item_super_predicates)
497 pub fn get_type<'tcx>(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt<'tcx>)
498 -> ty::TypeScheme<'tcx>
500 let item_doc = cdata.lookup_item(id);
501 let t = item_type(DefId { krate: cdata.cnum, node: id }, item_doc, tcx,
503 let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
510 pub fn get_stability(cdata: Cmd, id: ast::NodeId) -> Option<attr::Stability> {
511 let item = cdata.lookup_item(id);
512 reader::maybe_get_doc(item, tag_items_data_item_stability).map(|doc| {
513 let mut decoder = reader::Decoder::new(doc);
514 Decodable::decode(&mut decoder).unwrap()
518 pub fn get_repr_attrs(cdata: Cmd, id: ast::NodeId) -> Vec<attr::ReprAttr> {
519 let item = cdata.lookup_item(id);
520 match reader::maybe_get_doc(item, tag_items_data_item_repr).map(|doc| {
521 let mut decoder = reader::Decoder::new(doc);
522 Decodable::decode(&mut decoder).unwrap()
524 Some(attrs) => attrs,
529 pub fn get_impl_polarity<'tcx>(cdata: Cmd,
531 -> Option<hir::ImplPolarity>
533 let item_doc = cdata.lookup_item(id);
534 let fam = item_family(item_doc);
537 Some(parse_polarity(item_doc))
543 pub fn get_custom_coerce_unsized_kind<'tcx>(cdata: Cmd,
545 -> Option<ty::CustomCoerceUnsized> {
546 let item_doc = cdata.lookup_item(id);
547 reader::maybe_get_doc(item_doc, tag_impl_coerce_unsized_kind).map(|kind_doc| {
548 let mut decoder = reader::Decoder::new(kind_doc);
549 Decodable::decode(&mut decoder).unwrap()
553 pub fn get_impl_trait<'tcx>(cdata: Cmd,
555 tcx: &ty::ctxt<'tcx>)
556 -> Option<ty::TraitRef<'tcx>>
558 let item_doc = cdata.lookup_item(id);
559 let fam = item_family(item_doc);
561 Family::Impl | Family::DefaultImpl => {
562 reader::maybe_get_doc(item_doc, tag_item_trait_ref).map(|tp| {
563 doc_trait_ref(tp, tcx, cdata)
570 pub fn get_symbol(cdata: Cmd, id: ast::NodeId) -> String {
571 return item_symbol(cdata.lookup_item(id));
574 /// If you have a crate_metadata, call get_symbol instead
575 pub fn get_symbol_from_buf(data: &[u8], id: ast::NodeId) -> String {
576 let index = load_index(data);
577 let pos = index.lookup_item(data, id).unwrap();
578 let doc = reader::doc_at(data, pos as usize).unwrap().doc;
582 // Something that a name can resolve to.
583 #[derive(Copy, Clone, Debug)]
590 /// Iterates over the language items in the given crate.
591 pub fn each_lang_item<F>(cdata: Cmd, mut f: F) -> bool where
592 F: FnMut(ast::NodeId, usize) -> bool,
594 let root = rbml::Doc::new(cdata.data());
595 let lang_items = reader::get_doc(root, tag_lang_items);
596 reader::tagged_docs(lang_items, tag_lang_items_item).all(|item_doc| {
597 let id_doc = reader::get_doc(item_doc, tag_lang_items_item_id);
598 let id = reader::doc_as_u32(id_doc) as usize;
599 let node_id_doc = reader::get_doc(item_doc,
600 tag_lang_items_item_node_id);
601 let node_id = reader::doc_as_u32(node_id_doc) as ast::NodeId;
607 fn each_child_of_item_or_crate<F, G>(intr: Rc<IdentInterner>,
610 mut get_crate_data: G,
611 mut callback: F) where
612 F: FnMut(DefLike, ast::Name, hir::Visibility),
613 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
615 // Iterate over all children.
616 for child_info_doc in reader::tagged_docs(item_doc, tag_mod_child) {
617 let child_def_id = translated_def_id(cdata, child_info_doc);
619 // This item may be in yet another crate if it was the child of a
621 let crate_data = if child_def_id.krate == cdata.cnum {
624 Some(get_crate_data(child_def_id.krate))
626 let crate_data = match crate_data {
627 Some(ref cdata) => &**cdata,
632 match crate_data.get_item(child_def_id.node) {
634 Some(child_item_doc) => {
635 // Hand off the item to the callback.
636 let child_name = item_name(&*intr, child_item_doc);
637 let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id);
638 let visibility = item_visibility(child_item_doc);
639 callback(def_like, child_name, visibility);
644 // As a special case, iterate over all static methods of
645 // associated implementations too. This is a bit of a botch.
647 for inherent_impl_def_id_doc in reader::tagged_docs(item_doc,
648 tag_items_data_item_inherent_impl) {
649 let inherent_impl_def_id = item_def_id(inherent_impl_def_id_doc, cdata);
650 if let Some(inherent_impl_doc) = cdata.get_item(inherent_impl_def_id.node) {
651 for impl_item_def_id_doc in reader::tagged_docs(inherent_impl_doc,
652 tag_item_impl_item) {
653 let impl_item_def_id = item_def_id(impl_item_def_id_doc,
655 if let Some(impl_method_doc) = cdata.get_item(impl_item_def_id.node) {
656 if let StaticMethod = item_family(impl_method_doc) {
657 // Hand off the static method to the callback.
658 let static_method_name = item_name(&*intr, impl_method_doc);
659 let static_method_def_like = item_to_def_like(cdata, impl_method_doc,
661 callback(static_method_def_like,
663 item_visibility(impl_method_doc));
670 for reexport_doc in reexports(item_doc) {
671 let def_id_doc = reader::get_doc(reexport_doc,
672 tag_items_data_item_reexport_def_id);
673 let child_def_id = translated_def_id(cdata, def_id_doc);
675 let name_doc = reader::get_doc(reexport_doc,
676 tag_items_data_item_reexport_name);
677 let name = name_doc.as_str_slice();
679 // This reexport may be in yet another crate.
680 let crate_data = if child_def_id.krate == cdata.cnum {
683 Some(get_crate_data(child_def_id.krate))
685 let crate_data = match crate_data {
686 Some(ref cdata) => &**cdata,
691 if let Some(child_item_doc) = crate_data.get_item(child_def_id.node) {
692 // Hand off the item to the callback.
693 let def_like = item_to_def_like(crate_data, child_item_doc, child_def_id);
694 // These items have a public visibility because they're part of
695 // a public re-export.
696 callback(def_like, token::intern(name), hir::Public);
701 /// Iterates over each child of the given item.
702 pub fn each_child_of_item<F, G>(intr: Rc<IdentInterner>,
707 F: FnMut(DefLike, ast::Name, hir::Visibility),
708 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
711 let item_doc = match cdata.get_item(id) {
713 Some(item_doc) => item_doc,
716 each_child_of_item_or_crate(intr,
723 /// Iterates over all the top-level crate items.
724 pub fn each_top_level_item_of_crate<F, G>(intr: Rc<IdentInterner>,
728 F: FnMut(DefLike, ast::Name, hir::Visibility),
729 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
731 let root_doc = rbml::Doc::new(cdata.data());
732 let misc_info_doc = reader::get_doc(root_doc, tag_misc_info);
733 let crate_items_doc = reader::get_doc(misc_info_doc,
734 tag_misc_info_crate_items);
736 each_child_of_item_or_crate(intr,
743 pub fn get_item_path(cdata: Cmd, id: ast::NodeId) -> Vec<ast_map::PathElem> {
744 item_path(cdata.lookup_item(id))
747 pub fn get_item_name(intr: &IdentInterner, cdata: Cmd, id: ast::NodeId) -> ast::Name {
748 item_name(intr, cdata.lookup_item(id))
751 pub type DecodeInlinedItem<'a> =
752 Box<for<'tcx> FnMut(Cmd,
754 Vec<ast_map::PathElem>,
756 -> Result<&'tcx InlinedItem, Vec<ast_map::PathElem>> + 'a>;
758 pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: ast::NodeId,
759 mut decode_inlined_item: DecodeInlinedItem)
760 -> csearch::FoundAst<'tcx> {
761 debug!("Looking up item: {}", id);
762 let item_doc = cdata.lookup_item(id);
763 let path = item_path(item_doc).split_last().unwrap().1.to_vec();
764 match decode_inlined_item(cdata, tcx, path, item_doc) {
765 Ok(ii) => csearch::FoundAst::Found(ii),
767 match item_parent_item(cdata, item_doc) {
769 let parent_item = cdata.lookup_item(did.node);
770 match decode_inlined_item(cdata, tcx, path, parent_item) {
771 Ok(ii) => csearch::FoundAst::FoundParent(did, ii),
772 Err(_) => csearch::FoundAst::NotFound
775 None => csearch::FoundAst::NotFound
781 fn get_explicit_self(item: rbml::Doc) -> ty::ExplicitSelfCategory {
782 fn get_mutability(ch: u8) -> hir::Mutability {
784 'i' => hir::MutImmutable,
785 'm' => hir::MutMutable,
786 _ => panic!("unknown mutability character: `{}`", ch as char),
790 let explicit_self_doc = reader::get_doc(item, tag_item_trait_method_explicit_self);
791 let string = explicit_self_doc.as_str_slice();
793 let explicit_self_kind = string.as_bytes()[0];
794 match explicit_self_kind as char {
795 's' => ty::StaticExplicitSelfCategory,
796 'v' => ty::ByValueExplicitSelfCategory,
797 '~' => ty::ByBoxExplicitSelfCategory,
798 // FIXME(#4846) expl. region
800 ty::ByReferenceExplicitSelfCategory(
802 get_mutability(string.as_bytes()[1]))
804 _ => panic!("unknown self type code: `{}`", explicit_self_kind as char)
808 /// Returns the def IDs of all the items in the given implementation.
809 pub fn get_impl_items(cdata: Cmd, impl_id: ast::NodeId)
810 -> Vec<ty::ImplOrTraitItemId> {
811 reader::tagged_docs(cdata.lookup_item(impl_id), tag_item_impl_item).map(|doc| {
812 let def_id = item_def_id(doc, cdata);
813 match item_sort(doc) {
814 Some('C') => ty::ConstTraitItemId(def_id),
815 Some('r') | Some('p') => ty::MethodTraitItemId(def_id),
816 Some('t') => ty::TypeTraitItemId(def_id),
817 _ => panic!("unknown impl item sort"),
822 pub fn get_trait_name(intr: Rc<IdentInterner>,
826 let doc = cdata.lookup_item(id);
827 item_name(&*intr, doc)
830 pub fn is_static_method(cdata: Cmd, id: ast::NodeId) -> bool {
831 let doc = cdata.lookup_item(id);
832 match item_sort(doc) {
833 Some('r') | Some('p') => {
834 get_explicit_self(doc) == ty::StaticExplicitSelfCategory
840 pub fn get_impl_or_trait_item<'tcx>(intr: Rc<IdentInterner>,
843 tcx: &ty::ctxt<'tcx>)
844 -> ty::ImplOrTraitItem<'tcx> {
845 let item_doc = cdata.lookup_item(id);
847 let def_id = item_def_id(item_doc, cdata);
849 let container_id = item_require_parent_item(cdata, item_doc);
850 let container_doc = cdata.lookup_item(container_id.node);
851 let container = match item_family(container_doc) {
852 Trait => TraitContainer(container_id),
853 _ => ImplContainer(container_id),
856 let name = item_name(&*intr, item_doc);
857 let vis = item_visibility(item_doc);
859 match item_sort(item_doc) {
861 let ty = doc_type(item_doc, tcx, cdata);
862 let default = get_provided_source(item_doc, cdata);
863 ty::ConstTraitItem(Rc::new(ty::AssociatedConst {
868 container: container,
872 Some('r') | Some('p') => {
873 let generics = doc_generics(item_doc, tcx, cdata, tag_method_ty_generics);
874 let predicates = doc_predicates(item_doc, tcx, cdata, tag_method_ty_generics);
875 let fty = doc_method_fty(item_doc, tcx, cdata);
876 let explicit_self = get_explicit_self(item_doc);
877 let provided_source = get_provided_source(item_doc, cdata);
879 ty::MethodTraitItem(Rc::new(ty::Method::new(name,
890 let ty = maybe_doc_type(item_doc, tcx, cdata);
891 ty::TypeTraitItem(Rc::new(ty::AssociatedType {
896 container: container,
899 _ => panic!("unknown impl/trait item sort"),
903 pub fn get_trait_item_def_ids(cdata: Cmd, id: ast::NodeId)
904 -> Vec<ty::ImplOrTraitItemId> {
905 let item = cdata.lookup_item(id);
906 reader::tagged_docs(item, tag_item_trait_item).map(|mth| {
907 let def_id = item_def_id(mth, cdata);
908 match item_sort(mth) {
909 Some('C') => ty::ConstTraitItemId(def_id),
910 Some('r') | Some('p') => ty::MethodTraitItemId(def_id),
911 Some('t') => ty::TypeTraitItemId(def_id),
912 _ => panic!("unknown trait item sort"),
917 pub fn get_item_variances(cdata: Cmd, id: ast::NodeId) -> ty::ItemVariances {
918 let item_doc = cdata.lookup_item(id);
919 let variance_doc = reader::get_doc(item_doc, tag_item_variances);
920 let mut decoder = reader::Decoder::new(variance_doc);
921 Decodable::decode(&mut decoder).unwrap()
924 pub fn get_provided_trait_methods<'tcx>(intr: Rc<IdentInterner>,
927 tcx: &ty::ctxt<'tcx>)
928 -> Vec<Rc<ty::Method<'tcx>>> {
929 let item = cdata.lookup_item(id);
931 reader::tagged_docs(item, tag_item_trait_item).filter_map(|mth_id| {
932 let did = item_def_id(mth_id, cdata);
933 let mth = cdata.lookup_item(did.node);
935 if item_sort(mth) == Some('p') {
936 let trait_item = get_impl_or_trait_item(intr.clone(),
940 if let ty::MethodTraitItem(ref method) = trait_item {
941 Some((*method).clone())
951 pub fn get_associated_consts<'tcx>(intr: Rc<IdentInterner>,
954 tcx: &ty::ctxt<'tcx>)
955 -> Vec<Rc<ty::AssociatedConst<'tcx>>> {
956 let item = cdata.lookup_item(id);
958 [tag_item_trait_item, tag_item_impl_item].iter().flat_map(|&tag| {
959 reader::tagged_docs(item, tag).filter_map(|ac_id| {
960 let did = item_def_id(ac_id, cdata);
961 let ac_doc = cdata.lookup_item(did.node);
963 if item_sort(ac_doc) == Some('C') {
964 let trait_item = get_impl_or_trait_item(intr.clone(),
968 if let ty::ConstTraitItem(ref ac) = trait_item {
980 pub fn get_type_name_if_impl(cdata: Cmd,
981 node_id: ast::NodeId) -> Option<ast::Name> {
982 let item = cdata.lookup_item(node_id);
983 if item_family(item) != Impl {
987 reader::tagged_docs(item, tag_item_impl_type_basename).nth(0).map(|doc| {
988 token::intern(doc.as_str_slice())
992 pub fn get_methods_if_impl(intr: Rc<IdentInterner>,
994 node_id: ast::NodeId)
995 -> Option<Vec<MethodInfo> > {
996 let item = cdata.lookup_item(node_id);
997 if item_family(item) != Impl {
1001 // If this impl implements a trait, don't consider it.
1002 if reader::tagged_docs(item, tag_item_trait_ref).next().is_some() {
1006 let impl_method_ids = reader::tagged_docs(item, tag_item_impl_item)
1007 .map(|impl_method_doc| item_def_id(impl_method_doc, cdata));
1009 let mut impl_methods = Vec::new();
1010 for impl_method_id in impl_method_ids {
1011 let impl_method_doc = cdata.lookup_item(impl_method_id.node);
1012 let family = item_family(impl_method_doc);
1014 StaticMethod | Method => {
1015 impl_methods.push(MethodInfo {
1016 name: item_name(&*intr, impl_method_doc),
1017 def_id: item_def_id(impl_method_doc, cdata),
1018 vis: item_visibility(impl_method_doc),
1025 return Some(impl_methods);
1028 /// If node_id is the constructor of a tuple struct, retrieve the NodeId of
1029 /// the actual type definition, otherwise, return None
1030 pub fn get_tuple_struct_definition_if_ctor(cdata: Cmd,
1031 node_id: ast::NodeId)
1034 let item = cdata.lookup_item(node_id);
1035 reader::tagged_docs(item, tag_items_data_item_is_tuple_struct_ctor).next().map(|_| {
1036 item_require_parent_item(cdata, item)
1040 pub fn get_item_attrs(cdata: Cmd,
1041 orig_node_id: ast::NodeId)
1042 -> Vec<hir::Attribute> {
1043 // The attributes for a tuple struct are attached to the definition, not the ctor;
1044 // we assume that someone passing in a tuple struct ctor is actually wanting to
1045 // look at the definition
1046 let node_id = get_tuple_struct_definition_if_ctor(cdata, orig_node_id);
1047 let node_id = node_id.map(|x| x.node).unwrap_or(orig_node_id);
1048 let item = cdata.lookup_item(node_id);
1049 get_attributes(item)
1052 pub fn get_struct_field_attrs(cdata: Cmd) -> FnvHashMap<ast::NodeId, Vec<hir::Attribute>> {
1053 let data = rbml::Doc::new(cdata.data());
1054 let fields = reader::get_doc(data, tag_struct_fields);
1055 reader::tagged_docs(fields, tag_struct_field).map(|field| {
1056 let id = reader::doc_as_u32(reader::get_doc(field, tag_struct_field_id));
1057 let attrs = get_attributes(field);
1062 fn struct_field_family_to_visibility(family: Family) -> hir::Visibility {
1064 PublicField => hir::Public,
1065 InheritedField => hir::Inherited,
1070 pub fn get_struct_field_names(intr: &IdentInterner, cdata: Cmd, id: ast::NodeId)
1072 let item = cdata.lookup_item(id);
1073 reader::tagged_docs(item, tag_item_field).map(|an_item| {
1074 item_name(intr, an_item)
1075 }).chain(reader::tagged_docs(item, tag_item_unnamed_field).map(|_| {
1076 special_idents::unnamed_field.name
1080 fn get_meta_items(md: rbml::Doc) -> Vec<P<hir::MetaItem>> {
1081 reader::tagged_docs(md, tag_meta_item_word).map(|meta_item_doc| {
1082 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1083 let n = token::intern_and_get_ident(nd.as_str_slice());
1084 attr::mk_word_item(n)
1085 }).chain(reader::tagged_docs(md, tag_meta_item_name_value).map(|meta_item_doc| {
1086 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1087 let vd = reader::get_doc(meta_item_doc, tag_meta_item_value);
1088 let n = token::intern_and_get_ident(nd.as_str_slice());
1089 let v = token::intern_and_get_ident(vd.as_str_slice());
1090 // FIXME (#623): Should be able to decode MetaNameValue variants,
1091 // but currently the encoder just drops them
1092 attr::mk_name_value_item_str(n, v)
1093 })).chain(reader::tagged_docs(md, tag_meta_item_list).map(|meta_item_doc| {
1094 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1095 let n = token::intern_and_get_ident(nd.as_str_slice());
1096 let subitems = get_meta_items(meta_item_doc);
1097 attr::mk_list_item(n, subitems)
1101 fn get_attributes(md: rbml::Doc) -> Vec<hir::Attribute> {
1102 match reader::maybe_get_doc(md, tag_attributes) {
1104 reader::tagged_docs(attrs_d, tag_attribute).map(|attr_doc| {
1105 let is_sugared_doc = reader::doc_as_u8(
1106 reader::get_doc(attr_doc, tag_attribute_is_sugared_doc)
1108 let meta_items = get_meta_items(attr_doc);
1109 // Currently it's only possible to have a single meta item on
1111 assert_eq!(meta_items.len(), 1);
1112 let meta_item = meta_items.into_iter().nth(0).unwrap();
1114 node: hir::Attribute_ {
1115 id: attr::mk_attr_id(),
1116 style: hir::AttrOuter,
1118 is_sugared_doc: is_sugared_doc,
1120 span: codemap::DUMMY_SP
1128 fn list_crate_attributes(md: rbml::Doc, hash: &Svh,
1129 out: &mut io::Write) -> io::Result<()> {
1130 try!(write!(out, "=Crate Attributes ({})=\n", *hash));
1132 let r = get_attributes(md);
1134 try!(write!(out, "{}\n", pprust::attribute_to_string(attr)));
1140 pub fn get_crate_attributes(data: &[u8]) -> Vec<hir::Attribute> {
1141 get_attributes(rbml::Doc::new(data))
1145 pub struct CrateDep {
1146 pub cnum: ast::CrateNum,
1149 pub explicitly_linked: bool,
1152 pub fn get_crate_deps(data: &[u8]) -> Vec<CrateDep> {
1153 let cratedoc = rbml::Doc::new(data);
1154 let depsdoc = reader::get_doc(cratedoc, tag_crate_deps);
1156 fn docstr(doc: rbml::Doc, tag_: usize) -> String {
1157 let d = reader::get_doc(doc, tag_);
1158 d.as_str_slice().to_string()
1161 reader::tagged_docs(depsdoc, tag_crate_dep).enumerate().map(|(crate_num, depdoc)| {
1162 let name = docstr(depdoc, tag_crate_dep_crate_name);
1163 let hash = Svh::new(&docstr(depdoc, tag_crate_dep_hash));
1164 let doc = reader::get_doc(depdoc, tag_crate_dep_explicitly_linked);
1165 let explicitly_linked = reader::doc_as_u8(doc) != 0;
1167 cnum: crate_num as u32 + 1,
1170 explicitly_linked: explicitly_linked,
1175 fn list_crate_deps(data: &[u8], out: &mut io::Write) -> io::Result<()> {
1176 try!(write!(out, "=External Dependencies=\n"));
1177 for dep in &get_crate_deps(data) {
1178 try!(write!(out, "{} {}-{}\n", dep.cnum, dep.name, dep.hash));
1180 try!(write!(out, "\n"));
1184 pub fn maybe_get_crate_hash(data: &[u8]) -> Option<Svh> {
1185 let cratedoc = rbml::Doc::new(data);
1186 reader::maybe_get_doc(cratedoc, tag_crate_hash).map(|doc| {
1187 Svh::new(doc.as_str_slice())
1191 pub fn get_crate_hash(data: &[u8]) -> Svh {
1192 let cratedoc = rbml::Doc::new(data);
1193 let hashdoc = reader::get_doc(cratedoc, tag_crate_hash);
1194 Svh::new(hashdoc.as_str_slice())
1197 pub fn maybe_get_crate_name(data: &[u8]) -> Option<String> {
1198 let cratedoc = rbml::Doc::new(data);
1199 reader::maybe_get_doc(cratedoc, tag_crate_crate_name).map(|doc| {
1200 doc.as_str_slice().to_string()
1204 pub fn get_crate_triple(data: &[u8]) -> Option<String> {
1205 let cratedoc = rbml::Doc::new(data);
1206 let triple_doc = reader::maybe_get_doc(cratedoc, tag_crate_triple);
1207 triple_doc.map(|s| s.as_str().to_string())
1210 pub fn get_crate_name(data: &[u8]) -> String {
1211 maybe_get_crate_name(data).expect("no crate name in crate")
1214 pub fn list_crate_metadata(bytes: &[u8], out: &mut io::Write) -> io::Result<()> {
1215 let hash = get_crate_hash(bytes);
1216 let md = rbml::Doc::new(bytes);
1217 try!(list_crate_attributes(md, &hash, out));
1218 list_crate_deps(bytes, out)
1221 // Translates a def_id from an external crate to a def_id for the current
1222 // compilation environment. We use this when trying to load types from
1223 // external crates - if those types further refer to types in other crates
1224 // then we must translate the crate number from that encoded in the external
1225 // crate to the correct local crate number.
1226 pub fn translate_def_id(cdata: Cmd, did: DefId) -> DefId {
1228 return DefId { krate: cdata.cnum, node: did.node };
1231 match cdata.cnum_map.borrow().get(&did.krate) {
1238 None => panic!("didn't find a crate in the cnum_map")
1242 // Translate a DefId from the current compilation environment to a DefId
1243 // for an external crate.
1244 fn reverse_translate_def_id(cdata: Cmd, did: DefId) -> Option<DefId> {
1245 if did.krate == cdata.cnum {
1246 return Some(DefId { krate: LOCAL_CRATE, node: did.node });
1249 for (&local, &global) in cdata.cnum_map.borrow().iter() {
1250 if global == did.krate {
1251 return Some(DefId { krate: local, node: did.node });
1258 pub fn each_inherent_implementation_for_type<F>(cdata: Cmd,
1261 where F: FnMut(DefId),
1263 let item_doc = cdata.lookup_item(id);
1264 for impl_doc in reader::tagged_docs(item_doc, tag_items_data_item_inherent_impl) {
1265 if reader::maybe_get_doc(impl_doc, tag_item_trait_ref).is_none() {
1266 callback(item_def_id(impl_doc, cdata));
1271 pub fn each_implementation_for_trait<F>(cdata: Cmd,
1273 mut callback: F) where
1276 if cdata.cnum == def_id.krate {
1277 let item_doc = cdata.lookup_item(def_id.node);
1278 for impl_doc in reader::tagged_docs(item_doc, tag_items_data_item_extension_impl) {
1279 callback(item_def_id(impl_doc, cdata));
1284 // Do a reverse lookup beforehand to avoid touching the crate_num
1285 // hash map in the loop below.
1286 if let Some(crate_local_did) = reverse_translate_def_id(cdata, def_id) {
1287 let def_id_u64 = def_to_u64(crate_local_did);
1289 let impls_doc = reader::get_doc(rbml::Doc::new(cdata.data()), tag_impls);
1290 for impl_doc in reader::tagged_docs(impls_doc, tag_impls_impl) {
1291 let impl_trait = reader::get_doc(impl_doc, tag_impls_impl_trait_def_id);
1292 if reader::doc_as_u64(impl_trait) == def_id_u64 {
1293 callback(item_def_id(impl_doc, cdata));
1299 pub fn get_trait_of_item(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
1301 let item_doc = cdata.lookup_item(id);
1302 let parent_item_id = match item_parent_item(cdata, item_doc) {
1303 None => return None,
1304 Some(item_id) => item_id,
1306 let parent_item_doc = cdata.lookup_item(parent_item_id.node);
1307 match item_family(parent_item_doc) {
1308 Trait => Some(item_def_id(parent_item_doc, cdata)),
1309 Impl | DefaultImpl => {
1310 reader::maybe_get_doc(parent_item_doc, tag_item_trait_ref)
1311 .map(|_| item_trait_ref(parent_item_doc, tcx, cdata).def_id)
1318 pub fn get_native_libraries(cdata: Cmd)
1319 -> Vec<(cstore::NativeLibraryKind, String)> {
1320 let libraries = reader::get_doc(rbml::Doc::new(cdata.data()),
1321 tag_native_libraries);
1322 reader::tagged_docs(libraries, tag_native_libraries_lib).map(|lib_doc| {
1323 let kind_doc = reader::get_doc(lib_doc, tag_native_libraries_kind);
1324 let name_doc = reader::get_doc(lib_doc, tag_native_libraries_name);
1325 let kind: cstore::NativeLibraryKind =
1326 cstore::NativeLibraryKind::from_u32(reader::doc_as_u32(kind_doc)).unwrap();
1327 let name = name_doc.as_str().to_string();
1332 pub fn get_plugin_registrar_fn(data: &[u8]) -> Option<ast::NodeId> {
1333 reader::maybe_get_doc(rbml::Doc::new(data), tag_plugin_registrar_fn)
1334 .map(|doc| reader::doc_as_u32(doc))
1337 pub fn each_exported_macro<F>(data: &[u8], intr: &IdentInterner, mut f: F) where
1338 F: FnMut(ast::Name, Vec<hir::Attribute>, String) -> bool,
1340 let macros = reader::get_doc(rbml::Doc::new(data), tag_macro_defs);
1341 for macro_doc in reader::tagged_docs(macros, tag_macro_def) {
1342 let name = item_name(intr, macro_doc);
1343 let attrs = get_attributes(macro_doc);
1344 let body = reader::get_doc(macro_doc, tag_macro_def_body);
1345 if !f(name, attrs, body.as_str().to_string()) {
1351 pub fn get_dylib_dependency_formats(cdata: Cmd)
1352 -> Vec<(ast::CrateNum, cstore::LinkagePreference)>
1354 let formats = reader::get_doc(rbml::Doc::new(cdata.data()),
1355 tag_dylib_dependency_formats);
1356 let mut result = Vec::new();
1358 debug!("found dylib deps: {}", formats.as_str_slice());
1359 for spec in formats.as_str_slice().split(',') {
1360 if spec.is_empty() { continue }
1361 let cnum = spec.split(':').nth(0).unwrap();
1362 let link = spec.split(':').nth(1).unwrap();
1363 let cnum: ast::CrateNum = cnum.parse().unwrap();
1364 let cnum = match cdata.cnum_map.borrow().get(&cnum) {
1366 None => panic!("didn't find a crate in the cnum_map")
1368 result.push((cnum, if link == "d" {
1369 cstore::RequireDynamic
1371 cstore::RequireStatic
1377 pub fn get_missing_lang_items(cdata: Cmd)
1378 -> Vec<lang_items::LangItem>
1380 let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_lang_items);
1381 reader::tagged_docs(items, tag_lang_items_missing).map(|missing_docs| {
1382 lang_items::LangItem::from_u32(reader::doc_as_u32(missing_docs)).unwrap()
1386 pub fn get_method_arg_names(cdata: Cmd, id: ast::NodeId) -> Vec<String> {
1387 let method_doc = cdata.lookup_item(id);
1388 match reader::maybe_get_doc(method_doc, tag_method_argument_names) {
1390 reader::tagged_docs(args_doc, tag_method_argument_name).map(|name_doc| {
1391 name_doc.as_str_slice().to_string()
1398 pub fn get_reachable_ids(cdata: Cmd) -> Vec<DefId> {
1399 let items = reader::get_doc(rbml::Doc::new(cdata.data()),
1401 reader::tagged_docs(items, tag_reachable_id).map(|doc| {
1404 node: reader::doc_as_u32(doc),
1409 pub fn is_typedef(cdata: Cmd, id: ast::NodeId) -> bool {
1410 let item_doc = cdata.lookup_item(id);
1411 match item_family(item_doc) {
1417 pub fn is_const_fn(cdata: Cmd, id: ast::NodeId) -> bool {
1418 let item_doc = cdata.lookup_item(id);
1419 match fn_constness(item_doc) {
1420 hir::Constness::Const => true,
1421 hir::Constness::NotConst => false,
1425 pub fn is_impl(cdata: Cmd, id: ast::NodeId) -> bool {
1426 let item_doc = cdata.lookup_item(id);
1427 match item_family(item_doc) {
1433 fn doc_generics<'tcx>(base_doc: rbml::Doc,
1434 tcx: &ty::ctxt<'tcx>,
1437 -> ty::Generics<'tcx>
1439 let doc = reader::get_doc(base_doc, tag);
1441 let mut types = subst::VecPerParamSpace::empty();
1442 for p in reader::tagged_docs(doc, tag_type_param_def) {
1444 TyDecoder::with_doc(tcx, cdata.cnum, p,
1445 &mut |_, did| translate_def_id(cdata, did))
1446 .parse_type_param_def();
1447 types.push(bd.space, bd);
1450 let mut regions = subst::VecPerParamSpace::empty();
1451 for rp_doc in reader::tagged_docs(doc, tag_region_param_def) {
1452 let ident_str_doc = reader::get_doc(rp_doc,
1453 tag_region_param_def_ident);
1454 let name = item_name(&*token::get_ident_interner(), ident_str_doc);
1455 let def_id_doc = reader::get_doc(rp_doc,
1456 tag_region_param_def_def_id);
1457 let def_id = translated_def_id(cdata, def_id_doc);
1459 let doc = reader::get_doc(rp_doc, tag_region_param_def_space);
1460 let space = subst::ParamSpace::from_uint(reader::doc_as_u64(doc) as usize);
1462 let doc = reader::get_doc(rp_doc, tag_region_param_def_index);
1463 let index = reader::doc_as_u64(doc) as u32;
1465 let bounds = reader::tagged_docs(rp_doc, tag_items_data_region).map(|p| {
1466 TyDecoder::with_doc(tcx, cdata.cnum, p,
1467 &mut |_, did| translate_def_id(cdata, did))
1471 regions.push(space, ty::RegionParameterDef { name: name,
1478 ty::Generics { types: types, regions: regions }
1481 fn doc_predicates<'tcx>(base_doc: rbml::Doc,
1482 tcx: &ty::ctxt<'tcx>,
1485 -> ty::GenericPredicates<'tcx>
1487 let doc = reader::get_doc(base_doc, tag);
1489 let mut predicates = subst::VecPerParamSpace::empty();
1490 for predicate_doc in reader::tagged_docs(doc, tag_predicate) {
1491 let space_doc = reader::get_doc(predicate_doc, tag_predicate_space);
1492 let space = subst::ParamSpace::from_uint(reader::doc_as_u8(space_doc) as usize);
1494 let data_doc = reader::get_doc(predicate_doc, tag_predicate_data);
1496 TyDecoder::with_doc(tcx, cdata.cnum, data_doc,
1497 &mut |_, did| translate_def_id(cdata, did))
1500 predicates.push(space, data);
1503 ty::GenericPredicates { predicates: predicates }
1506 pub fn is_defaulted_trait(cdata: Cmd, trait_id: ast::NodeId) -> bool {
1507 let trait_doc = cdata.lookup_item(trait_id);
1508 assert!(item_family(trait_doc) == Family::Trait);
1509 let defaulted_doc = reader::get_doc(trait_doc, tag_defaulted_trait);
1510 reader::doc_as_u8(defaulted_doc) != 0
1513 pub fn is_default_impl(cdata: Cmd, impl_id: ast::NodeId) -> bool {
1514 let impl_doc = cdata.lookup_item(impl_id);
1515 item_family(impl_doc) == Family::DefaultImpl
1518 pub fn get_imported_filemaps(metadata: &[u8]) -> Vec<codemap::FileMap> {
1519 let crate_doc = rbml::Doc::new(metadata);
1520 let cm_doc = reader::get_doc(crate_doc, tag_codemap);
1522 reader::tagged_docs(cm_doc, tag_codemap_filemap).map(|filemap_doc| {
1523 let mut decoder = reader::Decoder::new(filemap_doc);
1524 Decodable::decode(&mut decoder).unwrap()
1528 pub fn is_extern_fn(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt) -> bool {
1529 let item_doc = match cdata.get_item(id) {
1531 None => return false,
1533 if let Fn = item_family(item_doc) {
1534 let ty::TypeScheme { generics, ty } = get_type(cdata, id, tcx);
1535 generics.types.is_empty() && match ty.sty {
1536 ty::TyBareFn(_, fn_ty) => fn_ty.abi != abi::Rust,