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::*;
19 use metadata::cstore::crate_metadata;
20 use metadata::common::*;
21 use metadata::csearch::MethodInfo;
22 use metadata::csearch;
24 use metadata::tydecode::{parse_ty_data, parse_region_data, parse_def_id,
25 parse_type_param_def_data, parse_bare_fn_ty_data,
26 parse_trait_ref_data, parse_predicate_data};
28 use middle::lang_items;
30 use middle::ty::{ImplContainer, TraitContainer};
31 use middle::ty::{self, Ty};
32 use middle::astencode::vtable_decoder_helpers;
34 use std::collections::HashMap;
35 use std::hash::{self, Hash, SipHasher};
36 use std::io::prelude::*;
38 use std::num::FromPrimitive;
40 use std::slice::bytes;
45 use serialize::Decodable;
48 use syntax::parse::token::{IdentInterner, special_idents};
49 use syntax::parse::token;
50 use syntax::print::pprust;
55 pub type Cmd<'a> = &'a crate_metadata;
57 // A function that takes a def_id relative to the crate being searched and
58 // returns a def_id relative to the compilation environment, i.e. if we hit a
59 // def_id for an item defined in another crate, somebody needs to figure out
60 // what crate that's in and give us a def_id that makes sense for the current
63 fn u32_from_be_bytes(bytes: &[u8]) -> u32 {
65 bytes::copy_memory(&bytes[..4], &mut b);
66 unsafe { (*(b.as_ptr() as *const u32)).to_be() }
69 fn lookup_hash<'a, F>(d: rbml::Doc<'a>, mut eq_fn: F, hash: u64) -> Option<rbml::Doc<'a>> where
70 F: FnMut(&[u8]) -> bool,
72 let index = reader::get_doc(d, tag_index);
73 let table = reader::get_doc(index, tag_index_table);
74 let hash_pos = table.start + (hash % 256 * 4) as usize;
75 let pos = u32_from_be_bytes(&d.data[hash_pos..]) as usize;
76 let tagged_doc = reader::doc_at(d.data, pos).unwrap();
78 let belt = tag_index_buckets_bucket_elt;
81 reader::tagged_docs(tagged_doc.doc, belt, |elt| {
82 let pos = u32_from_be_bytes(&elt.data[elt.start..]) as usize;
83 if eq_fn(&elt.data[elt.start + 4 .. elt.end]) {
84 ret = Some(reader::doc_at(d.data, pos).unwrap().doc);
93 pub fn maybe_find_item<'a>(item_id: ast::NodeId,
94 items: rbml::Doc<'a>) -> Option<rbml::Doc<'a>> {
95 fn eq_item(bytes: &[u8], item_id: ast::NodeId) -> bool {
96 u32_from_be_bytes(bytes) == item_id
99 |a| eq_item(a, item_id),
100 hash::hash::<i64, SipHasher>(&(item_id as i64)))
103 fn find_item<'a>(item_id: ast::NodeId, items: rbml::Doc<'a>) -> rbml::Doc<'a> {
104 match maybe_find_item(item_id, items) {
105 None => panic!("lookup_item: id not found: {}", item_id),
110 // Looks up an item in the given metadata and returns an rbml doc pointing
112 fn lookup_item<'a>(item_id: ast::NodeId, data: &'a [u8]) -> rbml::Doc<'a> {
113 let items = reader::get_doc(rbml::Doc::new(data), tag_items);
114 find_item(item_id, items)
140 fn item_family(item: rbml::Doc) -> Family {
141 let fam = reader::get_doc(item, tag_items_data_item_family);
142 match reader::doc_as_u8(fam) as char {
155 'V' => StructVariant,
161 'N' => InheritedField,
162 c => panic!("unexpected family char: {}", c)
166 fn item_visibility(item: rbml::Doc) -> ast::Visibility {
167 match reader::maybe_get_doc(item, tag_items_data_item_visibility) {
169 Some(visibility_doc) => {
170 match reader::doc_as_u8(visibility_doc) as char {
172 'i' => ast::Inherited,
173 _ => panic!("unknown visibility character")
179 fn item_sort(item: rbml::Doc) -> Option<char> {
181 reader::tagged_docs(item, tag_item_trait_item_sort, |doc| {
182 ret = Some(doc.as_str_slice().as_bytes()[0] as char);
188 fn item_symbol(item: rbml::Doc) -> String {
189 reader::get_doc(item, tag_items_data_item_symbol).as_str().to_string()
192 fn item_parent_item(d: rbml::Doc) -> Option<ast::DefId> {
194 reader::tagged_docs(d, tag_items_data_parent_item, |did| {
195 ret = Some(reader::with_doc_data(did, parse_def_id));
201 fn item_reqd_and_translated_parent_item(cnum: ast::CrateNum,
202 d: rbml::Doc) -> ast::DefId {
203 let trait_did = item_parent_item(d).expect("item without parent");
204 ast::DefId { krate: cnum, node: trait_did.node }
207 fn item_def_id(d: rbml::Doc, cdata: Cmd) -> ast::DefId {
208 let tagdoc = reader::get_doc(d, tag_def_id);
209 return translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
212 fn get_provided_source(d: rbml::Doc, cdata: Cmd) -> Option<ast::DefId> {
213 reader::maybe_get_doc(d, tag_item_method_provided_source).map(|doc| {
214 translate_def_id(cdata, reader::with_doc_data(doc, parse_def_id))
218 fn each_reexport<F>(d: rbml::Doc, f: F) -> bool where
219 F: FnMut(rbml::Doc) -> bool,
221 reader::tagged_docs(d, tag_items_data_item_reexport, f)
224 fn variant_disr_val(d: rbml::Doc) -> Option<ty::Disr> {
225 reader::maybe_get_doc(d, tag_disr_val).and_then(|val_doc| {
226 reader::with_doc_data(val_doc, |data| {
227 str::from_utf8(data).ok().and_then(|s| s.parse().ok())
232 fn doc_type<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> Ty<'tcx> {
233 let tp = reader::get_doc(doc, tag_items_data_item_type);
234 parse_ty_data(tp.data, cdata.cnum, tp.start, tcx,
235 |_, did| translate_def_id(cdata, did))
238 fn doc_method_fty<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>,
239 cdata: Cmd) -> ty::BareFnTy<'tcx> {
240 let tp = reader::get_doc(doc, tag_item_method_fty);
241 parse_bare_fn_ty_data(tp.data, cdata.cnum, tp.start, tcx,
242 |_, did| translate_def_id(cdata, did))
245 pub fn item_type<'tcx>(_item_id: ast::DefId, item: rbml::Doc,
246 tcx: &ty::ctxt<'tcx>, cdata: Cmd) -> Ty<'tcx> {
247 doc_type(item, tcx, cdata)
250 fn doc_trait_ref<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd)
251 -> Rc<ty::TraitRef<'tcx>> {
252 parse_trait_ref_data(doc.data, cdata.cnum, doc.start, tcx,
253 |_, did| translate_def_id(cdata, did))
256 fn item_trait_ref<'tcx>(doc: rbml::Doc, tcx: &ty::ctxt<'tcx>, cdata: Cmd)
257 -> Rc<ty::TraitRef<'tcx>> {
258 let tp = reader::get_doc(doc, tag_item_trait_ref);
259 doc_trait_ref(tp, tcx, cdata)
262 fn enum_variant_ids(item: rbml::Doc, cdata: Cmd) -> Vec<ast::DefId> {
263 let mut ids: Vec<ast::DefId> = Vec::new();
264 let v = tag_items_data_item_variant;
265 reader::tagged_docs(item, v, |p| {
266 let ext = reader::with_doc_data(p, parse_def_id);
267 ids.push(ast::DefId { krate: cdata.cnum, node: ext.node });
273 fn item_path(item_doc: rbml::Doc) -> Vec<ast_map::PathElem> {
274 let path_doc = reader::get_doc(item_doc, tag_path);
276 let len_doc = reader::get_doc(path_doc, tag_path_len);
277 let len = reader::doc_as_u32(len_doc) as usize;
279 let mut result = Vec::with_capacity(len);
280 reader::docs(path_doc, |tag, elt_doc| {
281 if tag == tag_path_elem_mod {
282 let s = elt_doc.as_str_slice();
283 result.push(ast_map::PathMod(token::intern(s)));
284 } else if tag == tag_path_elem_name {
285 let s = elt_doc.as_str_slice();
286 result.push(ast_map::PathName(token::intern(s)));
288 // ignore tag_path_len element
296 fn item_name(intr: &IdentInterner, item: rbml::Doc) -> ast::Name {
297 let name = reader::get_doc(item, tag_paths_data_name);
298 let string = name.as_str_slice();
299 match intr.find(string) {
300 None => token::intern(string),
305 fn item_to_def_like(item: rbml::Doc, did: ast::DefId, cnum: ast::CrateNum)
307 let fam = item_family(item);
309 Constant => DlDef(def::DefConst(did)),
310 ImmStatic => DlDef(def::DefStatic(did, false)),
311 MutStatic => DlDef(def::DefStatic(did, true)),
312 Struct => DlDef(def::DefStruct(did)),
313 Fn => DlDef(def::DefFn(did, false)),
314 CtorFn => DlDef(def::DefFn(did, true)),
315 Method | StaticMethod => {
316 // def_static_method carries an optional field of its enclosing
317 // trait or enclosing impl (if this is an inherent static method).
318 // So we need to detect whether this is in a trait or not, which
319 // we do through the mildly hacky way of checking whether there is
320 // a trait_parent_sort.
321 let provenance = if reader::maybe_get_doc(
322 item, tag_item_trait_parent_sort).is_some() {
323 def::FromTrait(item_reqd_and_translated_parent_item(cnum,
326 def::FromImpl(item_reqd_and_translated_parent_item(cnum,
329 DlDef(def::DefMethod(did, provenance))
332 if item_sort(item) == Some('t') {
333 let trait_did = item_reqd_and_translated_parent_item(cnum, item);
334 DlDef(def::DefAssociatedTy(trait_did, did))
336 DlDef(def::DefTy(did, false))
339 Mod => DlDef(def::DefMod(did)),
340 ForeignMod => DlDef(def::DefForeignMod(did)),
342 let enum_did = item_reqd_and_translated_parent_item(cnum, item);
343 DlDef(def::DefVariant(enum_did, did, true))
346 let enum_did = item_reqd_and_translated_parent_item(cnum, item);
347 DlDef(def::DefVariant(enum_did, did, false))
349 Trait => DlDef(def::DefTrait(did)),
350 Enum => DlDef(def::DefTy(did, true)),
351 Impl | DefaultImpl => DlImpl(did),
352 PublicField | InheritedField => DlField,
356 fn parse_unsafety(item_doc: rbml::Doc) -> ast::Unsafety {
357 let unsafety_doc = reader::get_doc(item_doc, tag_unsafety);
358 if reader::doc_as_u8(unsafety_doc) != 0 {
359 ast::Unsafety::Unsafe
361 ast::Unsafety::Normal
365 fn parse_paren_sugar(item_doc: rbml::Doc) -> bool {
366 let paren_sugar_doc = reader::get_doc(item_doc, tag_paren_sugar);
367 reader::doc_as_u8(paren_sugar_doc) != 0
370 fn parse_polarity(item_doc: rbml::Doc) -> ast::ImplPolarity {
371 let polarity_doc = reader::get_doc(item_doc, tag_polarity);
372 if reader::doc_as_u8(polarity_doc) != 0 {
373 ast::ImplPolarity::Negative
375 ast::ImplPolarity::Positive
379 fn parse_associated_type_names(item_doc: rbml::Doc) -> Vec<ast::Name> {
380 let names_doc = reader::get_doc(item_doc, tag_associated_type_names);
381 let mut names = Vec::new();
382 reader::tagged_docs(names_doc, tag_associated_type_name, |name_doc| {
383 let name = token::intern(name_doc.as_str_slice());
390 pub fn get_trait_def<'tcx>(cdata: Cmd,
391 item_id: ast::NodeId,
392 tcx: &ty::ctxt<'tcx>) -> ty::TraitDef<'tcx>
394 let item_doc = lookup_item(item_id, cdata.data());
395 let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
396 let unsafety = parse_unsafety(item_doc);
397 let associated_type_names = parse_associated_type_names(item_doc);
398 let paren_sugar = parse_paren_sugar(item_doc);
401 paren_sugar: paren_sugar,
404 trait_ref: item_trait_ref(item_doc, tcx, cdata),
405 associated_type_names: associated_type_names,
409 pub fn get_predicates<'tcx>(cdata: Cmd,
410 item_id: ast::NodeId,
411 tcx: &ty::ctxt<'tcx>)
412 -> ty::GenericPredicates<'tcx>
414 let item_doc = lookup_item(item_id, cdata.data());
415 doc_predicates(item_doc, tcx, cdata, tag_item_generics)
418 pub fn get_super_predicates<'tcx>(cdata: Cmd,
419 item_id: ast::NodeId,
420 tcx: &ty::ctxt<'tcx>)
421 -> ty::GenericPredicates<'tcx>
423 let item_doc = lookup_item(item_id, cdata.data());
424 doc_predicates(item_doc, tcx, cdata, tag_item_super_predicates)
427 pub fn get_type<'tcx>(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt<'tcx>)
428 -> ty::TypeScheme<'tcx>
430 let item_doc = lookup_item(id, cdata.data());
431 let t = item_type(ast::DefId { krate: cdata.cnum, node: id }, item_doc, tcx,
433 let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
440 pub fn get_stability(cdata: Cmd, id: ast::NodeId) -> Option<attr::Stability> {
441 let item = lookup_item(id, cdata.data());
442 reader::maybe_get_doc(item, tag_items_data_item_stability).map(|doc| {
443 let mut decoder = reader::Decoder::new(doc);
444 Decodable::decode(&mut decoder).unwrap()
448 pub fn get_repr_attrs(cdata: Cmd, id: ast::NodeId) -> Vec<attr::ReprAttr> {
449 let item = lookup_item(id, cdata.data());
450 match reader::maybe_get_doc(item, tag_items_data_item_repr).map(|doc| {
451 let mut decoder = reader::Decoder::new(doc);
452 Decodable::decode(&mut decoder).unwrap()
454 Some(attrs) => attrs,
459 pub fn get_impl_polarity<'tcx>(cdata: Cmd,
461 -> Option<ast::ImplPolarity>
463 let item_doc = lookup_item(id, cdata.data());
464 let fam = item_family(item_doc);
467 Some(parse_polarity(item_doc))
473 pub fn get_impl_trait<'tcx>(cdata: Cmd,
475 tcx: &ty::ctxt<'tcx>)
476 -> Option<Rc<ty::TraitRef<'tcx>>>
478 let item_doc = lookup_item(id, cdata.data());
479 let fam = item_family(item_doc);
481 Family::Impl | Family::DefaultImpl => {
482 reader::maybe_get_doc(item_doc, tag_item_trait_ref).map(|tp| {
483 doc_trait_ref(tp, tcx, cdata)
490 pub fn get_impl_vtables<'tcx>(cdata: Cmd,
492 tcx: &ty::ctxt<'tcx>)
493 -> ty::vtable_res<'tcx>
495 let item_doc = lookup_item(id, cdata.data());
496 let vtables_doc = reader::get_doc(item_doc, tag_item_impl_vtables);
497 let mut decoder = reader::Decoder::new(vtables_doc);
498 decoder.read_vtable_res(tcx, cdata)
502 pub fn get_symbol(data: &[u8], id: ast::NodeId) -> String {
503 return item_symbol(lookup_item(id, data));
506 // Something that a name can resolve to.
507 #[derive(Copy, Clone, Debug)]
514 /// Iterates over the language items in the given crate.
515 pub fn each_lang_item<F>(cdata: Cmd, mut f: F) -> bool where
516 F: FnMut(ast::NodeId, usize) -> bool,
518 let root = rbml::Doc::new(cdata.data());
519 let lang_items = reader::get_doc(root, tag_lang_items);
520 reader::tagged_docs(lang_items, tag_lang_items_item, |item_doc| {
521 let id_doc = reader::get_doc(item_doc, tag_lang_items_item_id);
522 let id = reader::doc_as_u32(id_doc) as usize;
523 let node_id_doc = reader::get_doc(item_doc,
524 tag_lang_items_item_node_id);
525 let node_id = reader::doc_as_u32(node_id_doc) as ast::NodeId;
531 fn each_child_of_item_or_crate<F, G>(intr: Rc<IdentInterner>,
534 mut get_crate_data: G,
535 mut callback: F) where
536 F: FnMut(DefLike, ast::Name, ast::Visibility),
537 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
539 // Iterate over all children.
540 let _ = reader::tagged_docs(item_doc, tag_mod_child, |child_info_doc| {
541 let child_def_id = reader::with_doc_data(child_info_doc,
543 let child_def_id = translate_def_id(cdata, child_def_id);
545 // This item may be in yet another crate if it was the child of a
547 let crate_data = if child_def_id.krate == cdata.cnum {
550 Some(get_crate_data(child_def_id.krate))
552 let crate_data = match crate_data {
553 Some(ref cdata) => &**cdata,
557 let other_crates_items = reader::get_doc(rbml::Doc::new(crate_data.data()), tag_items);
560 match maybe_find_item(child_def_id.node, other_crates_items) {
562 Some(child_item_doc) => {
563 // Hand off the item to the callback.
564 let child_name = item_name(&*intr, child_item_doc);
565 let def_like = item_to_def_like(child_item_doc,
568 let visibility = item_visibility(child_item_doc);
569 callback(def_like, child_name, visibility);
577 // As a special case, iterate over all static methods of
578 // associated implementations too. This is a bit of a botch.
580 let _ = reader::tagged_docs(item_doc,
581 tag_items_data_item_inherent_impl,
582 |inherent_impl_def_id_doc| {
583 let inherent_impl_def_id = item_def_id(inherent_impl_def_id_doc,
585 let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_items);
586 if let Some(inherent_impl_doc) = maybe_find_item(inherent_impl_def_id.node, items) {
587 let _ = reader::tagged_docs(inherent_impl_doc,
589 |impl_item_def_id_doc| {
590 let impl_item_def_id = item_def_id(impl_item_def_id_doc,
592 if let Some(impl_method_doc) = maybe_find_item(impl_item_def_id.node, items) {
593 if let StaticMethod = item_family(impl_method_doc) {
594 // Hand off the static method to the callback.
595 let static_method_name = item_name(&*intr, impl_method_doc);
596 let static_method_def_like = item_to_def_like(impl_method_doc,
599 callback(static_method_def_like,
601 item_visibility(impl_method_doc));
610 // Iterate over all reexports.
611 let _ = each_reexport(item_doc, |reexport_doc| {
612 let def_id_doc = reader::get_doc(reexport_doc,
613 tag_items_data_item_reexport_def_id);
614 let child_def_id = reader::with_doc_data(def_id_doc,
616 let child_def_id = translate_def_id(cdata, child_def_id);
618 let name_doc = reader::get_doc(reexport_doc,
619 tag_items_data_item_reexport_name);
620 let name = name_doc.as_str_slice();
622 // This reexport may be in yet another crate.
623 let crate_data = if child_def_id.krate == cdata.cnum {
626 Some(get_crate_data(child_def_id.krate))
628 let crate_data = match crate_data {
629 Some(ref cdata) => &**cdata,
633 let other_crates_items = reader::get_doc(rbml::Doc::new(crate_data.data()), tag_items);
636 if let Some(child_item_doc) = maybe_find_item(child_def_id.node, other_crates_items) {
637 // Hand off the item to the callback.
638 let def_like = item_to_def_like(child_item_doc,
641 // These items have a public visibility because they're part of
642 // a public re-export.
643 callback(def_like, token::intern(name), ast::Public);
650 /// Iterates over each child of the given item.
651 pub fn each_child_of_item<F, G>(intr: Rc<IdentInterner>,
656 F: FnMut(DefLike, ast::Name, ast::Visibility),
657 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
660 let root_doc = rbml::Doc::new(cdata.data());
661 let items = reader::get_doc(root_doc, tag_items);
662 let item_doc = match maybe_find_item(id, items) {
664 Some(item_doc) => item_doc,
667 each_child_of_item_or_crate(intr,
674 /// Iterates over all the top-level crate items.
675 pub fn each_top_level_item_of_crate<F, G>(intr: Rc<IdentInterner>,
679 F: FnMut(DefLike, ast::Name, ast::Visibility),
680 G: FnMut(ast::CrateNum) -> Rc<crate_metadata>,
682 let root_doc = rbml::Doc::new(cdata.data());
683 let misc_info_doc = reader::get_doc(root_doc, tag_misc_info);
684 let crate_items_doc = reader::get_doc(misc_info_doc,
685 tag_misc_info_crate_items);
687 each_child_of_item_or_crate(intr,
694 pub fn get_item_path(cdata: Cmd, id: ast::NodeId) -> Vec<ast_map::PathElem> {
695 item_path(lookup_item(id, cdata.data()))
698 pub type DecodeInlinedItem<'a> =
699 Box<for<'tcx> FnMut(Cmd,
701 Vec<ast_map::PathElem>,
703 -> Result<&'tcx ast::InlinedItem, Vec<ast_map::PathElem>> + 'a>;
705 pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: ast::NodeId,
706 mut decode_inlined_item: DecodeInlinedItem)
707 -> csearch::FoundAst<'tcx> {
708 debug!("Looking up item: {}", id);
709 let item_doc = lookup_item(id, cdata.data());
710 let path = item_path(item_doc).init().to_vec();
711 match decode_inlined_item(cdata, tcx, path, item_doc) {
712 Ok(ii) => csearch::FoundAst::Found(ii),
714 match item_parent_item(item_doc) {
716 let did = translate_def_id(cdata, did);
717 let parent_item = lookup_item(did.node, cdata.data());
718 match decode_inlined_item(cdata, tcx, path, parent_item) {
719 Ok(ii) => csearch::FoundAst::FoundParent(did, ii),
720 Err(_) => csearch::FoundAst::NotFound
723 None => csearch::FoundAst::NotFound
729 pub fn get_enum_variant_defs(intr: &IdentInterner,
732 -> Vec<(def::Def, ast::Name, ast::Visibility)> {
733 let data = cdata.data();
734 let items = reader::get_doc(rbml::Doc::new(data), tag_items);
735 let item = find_item(id, items);
736 enum_variant_ids(item, cdata).iter().map(|did| {
737 let item = find_item(did.node, items);
738 let name = item_name(intr, item);
739 let visibility = item_visibility(item);
740 match item_to_def_like(item, *did, cdata.cnum) {
741 DlDef(def @ def::DefVariant(..)) => (def, name, visibility),
747 pub fn get_enum_variants<'tcx>(intr: Rc<IdentInterner>, cdata: Cmd, id: ast::NodeId,
748 tcx: &ty::ctxt<'tcx>) -> Vec<Rc<ty::VariantInfo<'tcx>>> {
749 let data = cdata.data();
750 let items = reader::get_doc(rbml::Doc::new(data), tag_items);
751 let item = find_item(id, items);
752 let mut disr_val = 0;
753 enum_variant_ids(item, cdata).iter().map(|did| {
754 let item = find_item(did.node, items);
755 let ctor_ty = item_type(ast::DefId { krate: cdata.cnum, node: id},
757 let name = item_name(&*intr, item);
758 let (ctor_ty, arg_tys, arg_names) = match ctor_ty.sty {
759 ty::ty_bare_fn(_, ref f) =>
760 (Some(ctor_ty), f.sig.0.inputs.clone(), None),
761 _ => { // Nullary or struct enum variant.
762 let mut arg_names = Vec::new();
763 let arg_tys = get_struct_fields(intr.clone(), cdata, did.node)
766 arg_names.push(ast::Ident::new(field_ty.name));
767 get_type(cdata, field_ty.id.node, tcx).ty
770 let arg_names = if arg_names.len() == 0 { None } else { Some(arg_names) };
772 (None, arg_tys, arg_names)
775 match variant_disr_val(item) {
776 Some(val) => { disr_val = val; }
779 let old_disr_val = disr_val;
780 disr_val = disr_val.wrapping_add(1);
781 Rc::new(ty::VariantInfo {
783 arg_names: arg_names,
786 // I'm not even sure if we encode visibility
787 // for variants -- TEST -- tjc
789 disr_val: old_disr_val,
795 fn get_explicit_self(item: rbml::Doc) -> ty::ExplicitSelfCategory {
796 fn get_mutability(ch: u8) -> ast::Mutability {
798 'i' => ast::MutImmutable,
799 'm' => ast::MutMutable,
800 _ => panic!("unknown mutability character: `{}`", ch as char),
804 let explicit_self_doc = reader::get_doc(item, tag_item_trait_method_explicit_self);
805 let string = explicit_self_doc.as_str_slice();
807 let explicit_self_kind = string.as_bytes()[0];
808 match explicit_self_kind as char {
809 's' => ty::StaticExplicitSelfCategory,
810 'v' => ty::ByValueExplicitSelfCategory,
811 '~' => ty::ByBoxExplicitSelfCategory,
812 // FIXME(#4846) expl. region
814 ty::ByReferenceExplicitSelfCategory(
816 get_mutability(string.as_bytes()[1]))
818 _ => panic!("unknown self type code: `{}`", explicit_self_kind as char)
822 /// Returns the def IDs of all the items in the given implementation.
823 pub fn get_impl_items(cdata: Cmd, impl_id: ast::NodeId)
824 -> Vec<ty::ImplOrTraitItemId> {
825 let mut impl_items = Vec::new();
826 reader::tagged_docs(lookup_item(impl_id, cdata.data()),
827 tag_item_impl_item, |doc| {
828 let def_id = item_def_id(doc, cdata);
829 match item_sort(doc) {
830 Some('r') | Some('p') => {
831 impl_items.push(ty::MethodTraitItemId(def_id))
833 Some('t') => impl_items.push(ty::TypeTraitItemId(def_id)),
834 _ => panic!("unknown impl item sort"),
842 pub fn get_trait_name(intr: Rc<IdentInterner>,
846 let doc = lookup_item(id, cdata.data());
847 item_name(&*intr, doc)
850 pub fn is_static_method(cdata: Cmd, id: ast::NodeId) -> bool {
851 let doc = lookup_item(id, cdata.data());
852 match item_sort(doc) {
853 Some('r') | Some('p') => {
854 get_explicit_self(doc) == ty::StaticExplicitSelfCategory
860 pub fn get_impl_or_trait_item<'tcx>(intr: Rc<IdentInterner>,
863 tcx: &ty::ctxt<'tcx>)
864 -> ty::ImplOrTraitItem<'tcx> {
865 let method_doc = lookup_item(id, cdata.data());
867 let def_id = item_def_id(method_doc, cdata);
869 let container_id = item_reqd_and_translated_parent_item(cdata.cnum,
871 let container_doc = lookup_item(container_id.node, cdata.data());
872 let container = match item_family(container_doc) {
873 Trait => TraitContainer(container_id),
874 _ => ImplContainer(container_id),
877 let name = item_name(&*intr, method_doc);
878 let vis = item_visibility(method_doc);
880 match item_sort(method_doc) {
881 Some('r') | Some('p') => {
882 let generics = doc_generics(method_doc, tcx, cdata, tag_method_ty_generics);
883 let predicates = doc_predicates(method_doc, tcx, cdata, tag_method_ty_generics);
884 let fty = doc_method_fty(method_doc, tcx, cdata);
885 let explicit_self = get_explicit_self(method_doc);
886 let provided_source = get_provided_source(method_doc, cdata);
888 ty::MethodTraitItem(Rc::new(ty::Method::new(name,
899 ty::TypeTraitItem(Rc::new(ty::AssociatedType {
903 container: container,
906 _ => panic!("unknown impl/trait item sort"),
910 pub fn get_trait_item_def_ids(cdata: Cmd, id: ast::NodeId)
911 -> Vec<ty::ImplOrTraitItemId> {
912 let data = cdata.data();
913 let item = lookup_item(id, data);
914 let mut result = Vec::new();
915 reader::tagged_docs(item, tag_item_trait_item, |mth| {
916 let def_id = item_def_id(mth, cdata);
917 match item_sort(mth) {
918 Some('r') | Some('p') => {
919 result.push(ty::MethodTraitItemId(def_id));
921 Some('t') => result.push(ty::TypeTraitItemId(def_id)),
922 _ => panic!("unknown trait item sort"),
929 pub fn get_item_variances(cdata: Cmd, id: ast::NodeId) -> ty::ItemVariances {
930 let data = cdata.data();
931 let item_doc = lookup_item(id, data);
932 let variance_doc = reader::get_doc(item_doc, tag_item_variances);
933 let mut decoder = reader::Decoder::new(variance_doc);
934 Decodable::decode(&mut decoder).unwrap()
937 pub fn get_provided_trait_methods<'tcx>(intr: Rc<IdentInterner>,
940 tcx: &ty::ctxt<'tcx>)
941 -> Vec<Rc<ty::Method<'tcx>>> {
942 let data = cdata.data();
943 let item = lookup_item(id, data);
944 let mut result = Vec::new();
946 reader::tagged_docs(item, tag_item_trait_item, |mth_id| {
947 let did = item_def_id(mth_id, cdata);
948 let mth = lookup_item(did.node, data);
950 if item_sort(mth) == Some('p') {
951 let trait_item = get_impl_or_trait_item(intr.clone(),
956 ty::MethodTraitItem(ref method) => {
957 result.push((*method).clone())
959 ty::TypeTraitItem(_) => {}
968 pub fn get_type_name_if_impl(cdata: Cmd,
969 node_id: ast::NodeId) -> Option<ast::Name> {
970 let item = lookup_item(node_id, cdata.data());
971 if item_family(item) != Impl {
976 reader::tagged_docs(item, tag_item_impl_type_basename, |doc| {
977 ret = Some(token::intern(doc.as_str_slice()));
984 pub fn get_methods_if_impl(intr: Rc<IdentInterner>,
986 node_id: ast::NodeId)
987 -> Option<Vec<MethodInfo> > {
988 let item = lookup_item(node_id, cdata.data());
989 if item_family(item) != Impl {
993 // If this impl implements a trait, don't consider it.
994 let ret = reader::tagged_docs(item, tag_item_trait_ref, |_doc| {
998 if !ret { return None }
1000 let mut impl_method_ids = Vec::new();
1001 reader::tagged_docs(item, tag_item_impl_item, |impl_method_doc| {
1002 impl_method_ids.push(item_def_id(impl_method_doc, cdata));
1006 let mut impl_methods = Vec::new();
1007 for impl_method_id in &impl_method_ids {
1008 let impl_method_doc = lookup_item(impl_method_id.node, cdata.data());
1009 let family = item_family(impl_method_doc);
1011 StaticMethod | Method => {
1012 impl_methods.push(MethodInfo {
1013 name: item_name(&*intr, impl_method_doc),
1014 def_id: item_def_id(impl_method_doc, cdata),
1015 vis: item_visibility(impl_method_doc),
1022 return Some(impl_methods);
1025 /// If node_id is the constructor of a tuple struct, retrieve the NodeId of
1026 /// the actual type definition, otherwise, return None
1027 pub fn get_tuple_struct_definition_if_ctor(cdata: Cmd,
1028 node_id: ast::NodeId)
1029 -> Option<ast::DefId>
1031 let item = lookup_item(node_id, cdata.data());
1033 reader::tagged_docs(item, tag_items_data_item_is_tuple_struct_ctor, |_| {
1034 ret = Some(item_reqd_and_translated_parent_item(cdata.cnum, item));
1040 pub fn get_item_attrs(cdata: Cmd,
1041 orig_node_id: ast::NodeId)
1042 -> Vec<ast::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 = lookup_item(node_id, cdata.data());
1049 get_attributes(item)
1052 pub fn get_struct_field_attrs(cdata: Cmd) -> HashMap<ast::NodeId, Vec<ast::Attribute>> {
1053 let data = rbml::Doc::new(cdata.data());
1054 let fields = reader::get_doc(data, tag_struct_fields);
1055 let mut map = HashMap::new();
1056 reader::tagged_docs(fields, tag_struct_field, |field| {
1057 let id = reader::doc_as_u32(reader::get_doc(field, tag_struct_field_id));
1058 let attrs = get_attributes(field);
1059 map.insert(id, attrs);
1065 fn struct_field_family_to_visibility(family: Family) -> ast::Visibility {
1067 PublicField => ast::Public,
1068 InheritedField => ast::Inherited,
1073 pub fn get_struct_fields(intr: Rc<IdentInterner>, cdata: Cmd, id: ast::NodeId)
1074 -> Vec<ty::field_ty> {
1075 let data = cdata.data();
1076 let item = lookup_item(id, data);
1077 let mut result = Vec::new();
1078 reader::tagged_docs(item, tag_item_field, |an_item| {
1079 let f = item_family(an_item);
1080 if f == PublicField || f == InheritedField {
1081 let name = item_name(&*intr, an_item);
1082 let did = item_def_id(an_item, cdata);
1083 let tagdoc = reader::get_doc(an_item, tag_item_field_origin);
1084 let origin_id = translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
1085 result.push(ty::field_ty {
1088 vis: struct_field_family_to_visibility(f),
1094 reader::tagged_docs(item, tag_item_unnamed_field, |an_item| {
1095 let did = item_def_id(an_item, cdata);
1096 let tagdoc = reader::get_doc(an_item, tag_item_field_origin);
1097 let f = item_family(an_item);
1098 let origin_id = translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
1099 result.push(ty::field_ty {
1100 name: special_idents::unnamed_field.name,
1102 vis: struct_field_family_to_visibility(f),
1110 fn get_meta_items(md: rbml::Doc) -> Vec<P<ast::MetaItem>> {
1111 let mut items: Vec<P<ast::MetaItem>> = Vec::new();
1112 reader::tagged_docs(md, tag_meta_item_word, |meta_item_doc| {
1113 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1114 let n = token::intern_and_get_ident(nd.as_str_slice());
1115 items.push(attr::mk_word_item(n));
1118 reader::tagged_docs(md, tag_meta_item_name_value, |meta_item_doc| {
1119 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1120 let vd = reader::get_doc(meta_item_doc, tag_meta_item_value);
1121 let n = token::intern_and_get_ident(nd.as_str_slice());
1122 let v = token::intern_and_get_ident(vd.as_str_slice());
1123 // FIXME (#623): Should be able to decode MetaNameValue variants,
1124 // but currently the encoder just drops them
1125 items.push(attr::mk_name_value_item_str(n, v));
1128 reader::tagged_docs(md, tag_meta_item_list, |meta_item_doc| {
1129 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1130 let n = token::intern_and_get_ident(nd.as_str_slice());
1131 let subitems = get_meta_items(meta_item_doc);
1132 items.push(attr::mk_list_item(n, subitems.into_iter().collect()));
1138 fn get_attributes(md: rbml::Doc) -> Vec<ast::Attribute> {
1139 let mut attrs: Vec<ast::Attribute> = Vec::new();
1140 match reader::maybe_get_doc(md, tag_attributes) {
1142 reader::tagged_docs(attrs_d, tag_attribute, |attr_doc| {
1143 let is_sugared_doc = reader::doc_as_u8(
1144 reader::get_doc(attr_doc, tag_attribute_is_sugared_doc)
1146 let meta_items = get_meta_items(attr_doc);
1147 // Currently it's only possible to have a single meta item on
1149 assert_eq!(meta_items.len(), 1);
1150 let meta_item = meta_items.into_iter().nth(0).unwrap();
1153 node: ast::Attribute_ {
1154 id: attr::mk_attr_id(),
1155 style: ast::AttrOuter,
1157 is_sugared_doc: is_sugared_doc,
1159 span: codemap::DUMMY_SP
1169 fn list_crate_attributes(md: rbml::Doc, hash: &Svh,
1170 out: &mut io::Write) -> io::Result<()> {
1171 try!(write!(out, "=Crate Attributes ({})=\n", *hash));
1173 let r = get_attributes(md);
1175 try!(write!(out, "{}\n", pprust::attribute_to_string(attr)));
1181 pub fn get_crate_attributes(data: &[u8]) -> Vec<ast::Attribute> {
1182 get_attributes(rbml::Doc::new(data))
1186 pub struct CrateDep {
1187 pub cnum: ast::CrateNum,
1192 pub fn get_crate_deps(data: &[u8]) -> Vec<CrateDep> {
1193 let mut deps: Vec<CrateDep> = Vec::new();
1194 let cratedoc = rbml::Doc::new(data);
1195 let depsdoc = reader::get_doc(cratedoc, tag_crate_deps);
1196 let mut crate_num = 1;
1197 fn docstr(doc: rbml::Doc, tag_: usize) -> String {
1198 let d = reader::get_doc(doc, tag_);
1199 d.as_str_slice().to_string()
1201 reader::tagged_docs(depsdoc, tag_crate_dep, |depdoc| {
1202 let name = docstr(depdoc, tag_crate_dep_crate_name);
1203 let hash = Svh::new(&docstr(depdoc, tag_crate_dep_hash));
1204 deps.push(CrateDep {
1215 fn list_crate_deps(data: &[u8], out: &mut io::Write) -> io::Result<()> {
1216 try!(write!(out, "=External Dependencies=\n"));
1217 for dep in &get_crate_deps(data) {
1218 try!(write!(out, "{} {}-{}\n", dep.cnum, dep.name, dep.hash));
1220 try!(write!(out, "\n"));
1224 pub fn maybe_get_crate_hash(data: &[u8]) -> Option<Svh> {
1225 let cratedoc = rbml::Doc::new(data);
1226 reader::maybe_get_doc(cratedoc, tag_crate_hash).map(|doc| {
1227 Svh::new(doc.as_str_slice())
1231 pub fn get_crate_hash(data: &[u8]) -> Svh {
1232 let cratedoc = rbml::Doc::new(data);
1233 let hashdoc = reader::get_doc(cratedoc, tag_crate_hash);
1234 Svh::new(hashdoc.as_str_slice())
1237 pub fn maybe_get_crate_name(data: &[u8]) -> Option<String> {
1238 let cratedoc = rbml::Doc::new(data);
1239 reader::maybe_get_doc(cratedoc, tag_crate_crate_name).map(|doc| {
1240 doc.as_str_slice().to_string()
1244 pub fn get_crate_triple(data: &[u8]) -> Option<String> {
1245 let cratedoc = rbml::Doc::new(data);
1246 let triple_doc = reader::maybe_get_doc(cratedoc, tag_crate_triple);
1247 triple_doc.map(|s| s.as_str().to_string())
1250 pub fn get_crate_name(data: &[u8]) -> String {
1251 maybe_get_crate_name(data).expect("no crate name in crate")
1254 pub fn list_crate_metadata(bytes: &[u8], out: &mut io::Write) -> io::Result<()> {
1255 let hash = get_crate_hash(bytes);
1256 let md = rbml::Doc::new(bytes);
1257 try!(list_crate_attributes(md, &hash, out));
1258 list_crate_deps(bytes, out)
1261 // Translates a def_id from an external crate to a def_id for the current
1262 // compilation environment. We use this when trying to load types from
1263 // external crates - if those types further refer to types in other crates
1264 // then we must translate the crate number from that encoded in the external
1265 // crate to the correct local crate number.
1266 pub fn translate_def_id(cdata: Cmd, did: ast::DefId) -> ast::DefId {
1267 if did.krate == ast::LOCAL_CRATE {
1268 return ast::DefId { krate: cdata.cnum, node: did.node };
1271 match cdata.cnum_map.get(&did.krate) {
1278 None => panic!("didn't find a crate in the cnum_map")
1282 pub fn each_impl<F>(cdata: Cmd, mut callback: F) where
1283 F: FnMut(ast::DefId),
1285 let impls_doc = reader::get_doc(rbml::Doc::new(cdata.data()), tag_impls);
1286 let _ = reader::tagged_docs(impls_doc, tag_impls_impl, |impl_doc| {
1287 callback(item_def_id(impl_doc, cdata));
1292 pub fn each_implementation_for_type<F>(cdata: Cmd,
1295 where F: FnMut(ast::DefId),
1297 let item_doc = lookup_item(id, cdata.data());
1298 reader::tagged_docs(item_doc,
1299 tag_items_data_item_inherent_impl,
1301 let implementation_def_id = item_def_id(impl_doc, cdata);
1302 callback(implementation_def_id);
1307 pub fn each_implementation_for_trait<F>(cdata: Cmd,
1309 mut callback: F) where
1310 F: FnMut(ast::DefId),
1312 let item_doc = lookup_item(id, cdata.data());
1314 let _ = reader::tagged_docs(item_doc,
1315 tag_items_data_item_extension_impl,
1317 let implementation_def_id = item_def_id(impl_doc, cdata);
1318 callback(implementation_def_id);
1323 pub fn get_trait_of_item(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
1324 -> Option<ast::DefId> {
1325 let item_doc = lookup_item(id, cdata.data());
1326 let parent_item_id = match item_parent_item(item_doc) {
1327 None => return None,
1328 Some(item_id) => item_id,
1330 let parent_item_id = translate_def_id(cdata, parent_item_id);
1331 let parent_item_doc = lookup_item(parent_item_id.node, cdata.data());
1332 match item_family(parent_item_doc) {
1333 Trait => Some(item_def_id(parent_item_doc, cdata)),
1334 Impl | DefaultImpl => {
1335 reader::maybe_get_doc(parent_item_doc, tag_item_trait_ref)
1336 .map(|_| item_trait_ref(parent_item_doc, tcx, cdata).def_id)
1343 pub fn get_native_libraries(cdata: Cmd)
1344 -> Vec<(cstore::NativeLibraryKind, String)> {
1345 let libraries = reader::get_doc(rbml::Doc::new(cdata.data()),
1346 tag_native_libraries);
1347 let mut result = Vec::new();
1348 reader::tagged_docs(libraries, tag_native_libraries_lib, |lib_doc| {
1349 let kind_doc = reader::get_doc(lib_doc, tag_native_libraries_kind);
1350 let name_doc = reader::get_doc(lib_doc, tag_native_libraries_name);
1351 let kind: cstore::NativeLibraryKind =
1352 FromPrimitive::from_u32(reader::doc_as_u32(kind_doc)).unwrap();
1353 let name = name_doc.as_str().to_string();
1354 result.push((kind, name));
1360 pub fn get_plugin_registrar_fn(data: &[u8]) -> Option<ast::NodeId> {
1361 reader::maybe_get_doc(rbml::Doc::new(data), tag_plugin_registrar_fn)
1362 .map(|doc| FromPrimitive::from_u32(reader::doc_as_u32(doc)).unwrap())
1365 pub fn each_exported_macro<F>(data: &[u8], intr: &IdentInterner, mut f: F) where
1366 F: FnMut(ast::Name, Vec<ast::Attribute>, String) -> bool,
1368 let macros = reader::get_doc(rbml::Doc::new(data), tag_macro_defs);
1369 reader::tagged_docs(macros, tag_macro_def, |macro_doc| {
1370 let name = item_name(intr, macro_doc);
1371 let attrs = get_attributes(macro_doc);
1372 let body = reader::get_doc(macro_doc, tag_macro_def_body);
1373 f(name, attrs, body.as_str().to_string())
1377 pub fn get_dylib_dependency_formats(cdata: Cmd)
1378 -> Vec<(ast::CrateNum, cstore::LinkagePreference)>
1380 let formats = reader::get_doc(rbml::Doc::new(cdata.data()),
1381 tag_dylib_dependency_formats);
1382 let mut result = Vec::new();
1384 debug!("found dylib deps: {}", formats.as_str_slice());
1385 for spec in formats.as_str_slice().split(',') {
1386 if spec.len() == 0 { continue }
1387 let cnum = spec.split(':').nth(0).unwrap();
1388 let link = spec.split(':').nth(1).unwrap();
1389 let cnum: ast::CrateNum = cnum.parse().unwrap();
1390 let cnum = match cdata.cnum_map.get(&cnum) {
1392 None => panic!("didn't find a crate in the cnum_map")
1394 result.push((cnum, if link == "d" {
1395 cstore::RequireDynamic
1397 cstore::RequireStatic
1403 pub fn get_missing_lang_items(cdata: Cmd)
1404 -> Vec<lang_items::LangItem>
1406 let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_lang_items);
1407 let mut result = Vec::new();
1408 reader::tagged_docs(items, tag_lang_items_missing, |missing_docs| {
1409 let item: lang_items::LangItem =
1410 FromPrimitive::from_u32(reader::doc_as_u32(missing_docs)).unwrap();
1417 pub fn get_method_arg_names(cdata: Cmd, id: ast::NodeId) -> Vec<String> {
1418 let mut ret = Vec::new();
1419 let method_doc = lookup_item(id, cdata.data());
1420 match reader::maybe_get_doc(method_doc, tag_method_argument_names) {
1422 reader::tagged_docs(args_doc, tag_method_argument_name, |name_doc| {
1423 ret.push(name_doc.as_str_slice().to_string());
1432 pub fn get_reachable_extern_fns(cdata: Cmd) -> Vec<ast::DefId> {
1433 let mut ret = Vec::new();
1434 let items = reader::get_doc(rbml::Doc::new(cdata.data()),
1435 tag_reachable_extern_fns);
1436 reader::tagged_docs(items, tag_reachable_extern_fn_id, |doc| {
1437 ret.push(ast::DefId {
1439 node: reader::doc_as_u32(doc),
1446 pub fn is_typedef(cdata: Cmd, id: ast::NodeId) -> bool {
1447 let item_doc = lookup_item(id, cdata.data());
1448 match item_family(item_doc) {
1454 fn doc_generics<'tcx>(base_doc: rbml::Doc,
1455 tcx: &ty::ctxt<'tcx>,
1458 -> ty::Generics<'tcx>
1460 let doc = reader::get_doc(base_doc, tag);
1462 let mut types = subst::VecPerParamSpace::empty();
1463 reader::tagged_docs(doc, tag_type_param_def, |p| {
1464 let bd = parse_type_param_def_data(
1465 p.data, p.start, cdata.cnum, tcx,
1466 |_, did| translate_def_id(cdata, did));
1467 types.push(bd.space, bd);
1471 let mut regions = subst::VecPerParamSpace::empty();
1472 reader::tagged_docs(doc, tag_region_param_def, |rp_doc| {
1473 let ident_str_doc = reader::get_doc(rp_doc,
1474 tag_region_param_def_ident);
1475 let name = item_name(&*token::get_ident_interner(), ident_str_doc);
1476 let def_id_doc = reader::get_doc(rp_doc,
1477 tag_region_param_def_def_id);
1478 let def_id = reader::with_doc_data(def_id_doc, parse_def_id);
1479 let def_id = translate_def_id(cdata, def_id);
1481 let doc = reader::get_doc(rp_doc, tag_region_param_def_space);
1482 let space = subst::ParamSpace::from_uint(reader::doc_as_u64(doc) as usize);
1484 let doc = reader::get_doc(rp_doc, tag_region_param_def_index);
1485 let index = reader::doc_as_u64(doc) as u32;
1487 let mut bounds = Vec::new();
1488 reader::tagged_docs(rp_doc, tag_items_data_region, |p| {
1491 p.data, cdata.cnum, p.start, tcx,
1492 |_, did| translate_def_id(cdata, did)));
1496 regions.push(space, ty::RegionParameterDef { name: name,
1505 ty::Generics { types: types, regions: regions }
1508 fn doc_predicates<'tcx>(base_doc: rbml::Doc,
1509 tcx: &ty::ctxt<'tcx>,
1512 -> ty::GenericPredicates<'tcx>
1514 let doc = reader::get_doc(base_doc, tag);
1516 let mut predicates = subst::VecPerParamSpace::empty();
1517 reader::tagged_docs(doc, tag_predicate, |predicate_doc| {
1518 let space_doc = reader::get_doc(predicate_doc, tag_predicate_space);
1519 let space = subst::ParamSpace::from_uint(reader::doc_as_u8(space_doc) as usize);
1521 let data_doc = reader::get_doc(predicate_doc, tag_predicate_data);
1522 let data = parse_predicate_data(data_doc.data, data_doc.start, cdata.cnum, tcx,
1523 |_, did| translate_def_id(cdata, did));
1525 predicates.push(space, data);
1529 ty::GenericPredicates { predicates: predicates }
1532 pub fn is_associated_type(cdata: Cmd, id: ast::NodeId) -> bool {
1533 let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_items);
1534 match maybe_find_item(id, items) {
1536 Some(item) => item_sort(item) == Some('t'),
1540 pub fn is_defaulted_trait(cdata: Cmd, trait_id: ast::NodeId) -> bool {
1541 let trait_doc = lookup_item(trait_id, cdata.data());
1542 assert!(item_family(trait_doc) == Family::Trait);
1543 let defaulted_doc = reader::get_doc(trait_doc, tag_defaulted_trait);
1544 reader::doc_as_u8(defaulted_doc) != 0
1547 pub fn is_default_impl(cdata: Cmd, impl_id: ast::NodeId) -> bool {
1548 let impl_doc = lookup_item(impl_id, cdata.data());
1549 item_family(impl_doc) == Family::DefaultImpl
1552 pub fn get_imported_filemaps(metadata: &[u8]) -> Vec<codemap::FileMap> {
1553 let crate_doc = rbml::Doc::new(metadata);
1554 let cm_doc = reader::get_doc(crate_doc, tag_codemap);
1556 let mut filemaps = vec![];
1558 reader::tagged_docs(cm_doc, tag_codemap_filemap, |filemap_doc| {
1559 let mut decoder = reader::Decoder::new(filemap_doc);
1560 let filemap: codemap::FileMap = Decodable::decode(&mut decoder).unwrap();
1561 filemaps.push(filemap);