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)]
16 use metadata::cstore::crate_metadata;
17 use metadata::common::*;
18 use metadata::csearch::StaticMethodInfo;
19 use metadata::csearch;
21 use metadata::tydecode::{parse_ty_data, parse_def_id,
22 parse_type_param_def_data,
23 parse_bare_fn_ty_data, parse_trait_ref_data};
24 use middle::lang_items;
27 use middle::ty::{ImplContainer, TraitContainer};
30 use middle::astencode::vtable_decoder_helpers;
35 use std::io::extensions::u64_from_be_bytes;
39 use serialize::ebml::reader;
41 use serialize::Decodable;
44 use syntax::parse::token::{IdentInterner, special_idents};
45 use syntax::parse::token;
46 use syntax::print::pprust;
49 use syntax::crateid::CrateId;
51 pub type Cmd<'a> = &'a crate_metadata;
53 // A function that takes a def_id relative to the crate being searched and
54 // returns a def_id relative to the compilation environment, i.e. if we hit a
55 // def_id for an item defined in another crate, somebody needs to figure out
56 // what crate that's in and give us a def_id that makes sense for the current
59 fn lookup_hash<'a>(d: ebml::Doc<'a>, eq_fn: |&[u8]| -> bool,
60 hash: u64) -> Option<ebml::Doc<'a>> {
61 let index = reader::get_doc(d, tag_index);
62 let table = reader::get_doc(index, tag_index_table);
63 let hash_pos = table.start + (hash % 256 * 4) as uint;
64 let pos = u64_from_be_bytes(d.data, hash_pos, 4) as uint;
65 let tagged_doc = reader::doc_at(d.data, pos).unwrap();
67 let belt = tag_index_buckets_bucket_elt;
70 reader::tagged_docs(tagged_doc.doc, belt, |elt| {
71 let pos = u64_from_be_bytes(elt.data, elt.start, 4) as uint;
72 if eq_fn(elt.data.slice(elt.start + 4, elt.end)) {
73 ret = Some(reader::doc_at(d.data, pos).unwrap().doc);
82 pub fn maybe_find_item<'a>(item_id: ast::NodeId,
83 items: ebml::Doc<'a>) -> Option<ebml::Doc<'a>> {
84 fn eq_item(bytes: &[u8], item_id: ast::NodeId) -> bool {
85 return u64_from_be_bytes(
86 bytes.slice(0u, 4u), 0u, 4u) as ast::NodeId
90 |a| eq_item(a, item_id),
91 hash::hash(&(item_id as i64)))
94 fn find_item<'a>(item_id: ast::NodeId, items: ebml::Doc<'a>) -> ebml::Doc<'a> {
95 match maybe_find_item(item_id, items) {
96 None => fail!("lookup_item: id not found: {}", item_id),
101 // Looks up an item in the given metadata and returns an ebml doc pointing
103 fn lookup_item<'a>(item_id: ast::NodeId, data: &'a [u8]) -> ebml::Doc<'a> {
104 let items = reader::get_doc(ebml::Doc::new(data), tag_items);
105 find_item(item_id, items)
108 #[deriving(PartialEq)]
115 UnsafeStaticMethod, // U
130 fn item_family(item: ebml::Doc) -> Family {
131 let fam = reader::get_doc(item, tag_items_data_item_family);
132 match reader::doc_as_u8(fam) as char {
138 'U' => UnsafeStaticMethod,
145 'V' => StructVariant,
150 'N' => InheritedField,
151 c => fail!("unexpected family char: {}", c)
155 fn item_visibility(item: ebml::Doc) -> ast::Visibility {
156 match reader::maybe_get_doc(item, tag_items_data_item_visibility) {
158 Some(visibility_doc) => {
159 match reader::doc_as_u8(visibility_doc) as char {
161 'i' => ast::Inherited,
162 _ => fail!("unknown visibility character")
168 fn item_sized(item: ebml::Doc) -> ast::Sized {
169 match reader::maybe_get_doc(item, tag_items_data_item_sized) {
170 None => ast::StaticSize,
172 match reader::doc_as_u8(sized_doc) as char {
174 's' => ast::StaticSize,
175 _ => fail!("unknown sized-ness character")
181 fn item_method_sort(item: ebml::Doc) -> char {
183 reader::tagged_docs(item, tag_item_trait_method_sort, |doc| {
184 ret = doc.as_str_slice().as_bytes()[0] as char;
190 fn item_symbol(item: ebml::Doc) -> String {
191 reader::get_doc(item, tag_items_data_item_symbol).as_str().to_string()
194 fn item_parent_item(d: ebml::Doc) -> Option<ast::DefId> {
196 reader::tagged_docs(d, tag_items_data_parent_item, |did| {
197 ret = Some(reader::with_doc_data(did, parse_def_id));
203 fn item_reqd_and_translated_parent_item(cnum: ast::CrateNum,
204 d: ebml::Doc) -> ast::DefId {
205 let trait_did = item_parent_item(d).expect("item without parent");
206 ast::DefId { krate: cnum, node: trait_did.node }
209 fn item_def_id(d: ebml::Doc, cdata: Cmd) -> ast::DefId {
210 let tagdoc = reader::get_doc(d, tag_def_id);
211 return translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
214 fn get_provided_source(d: ebml::Doc, cdata: Cmd) -> Option<ast::DefId> {
215 reader::maybe_get_doc(d, tag_item_method_provided_source).map(|doc| {
216 translate_def_id(cdata, reader::with_doc_data(doc, parse_def_id))
220 fn each_reexport(d: ebml::Doc, f: |ebml::Doc| -> bool) -> bool {
221 reader::tagged_docs(d, tag_items_data_item_reexport, f)
224 fn variant_disr_val(d: ebml::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| u64::parse_bytes(data, 10u))
230 fn doc_type(doc: ebml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::t {
231 let tp = reader::get_doc(doc, tag_items_data_item_type);
232 parse_ty_data(tp.data, cdata.cnum, tp.start, tcx,
233 |_, did| translate_def_id(cdata, did))
236 fn doc_method_fty(doc: ebml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::BareFnTy {
237 let tp = reader::get_doc(doc, tag_item_method_fty);
238 parse_bare_fn_ty_data(tp.data, cdata.cnum, tp.start, tcx,
239 |_, did| translate_def_id(cdata, did))
242 pub fn item_type(_item_id: ast::DefId, item: ebml::Doc,
243 tcx: &ty::ctxt, cdata: Cmd) -> ty::t {
244 doc_type(item, tcx, cdata)
247 fn doc_trait_ref(doc: ebml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::TraitRef {
248 parse_trait_ref_data(doc.data, cdata.cnum, doc.start, tcx,
249 |_, did| translate_def_id(cdata, did))
252 fn item_trait_ref(doc: ebml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::TraitRef {
253 let tp = reader::get_doc(doc, tag_item_trait_ref);
254 doc_trait_ref(tp, tcx, cdata)
257 fn item_ty_param_defs(item: ebml::Doc,
261 -> subst::VecPerParamSpace<ty::TypeParameterDef> {
262 let mut bounds = subst::VecPerParamSpace::empty();
263 reader::tagged_docs(item, tag, |p| {
264 let bd = parse_type_param_def_data(
265 p.data, p.start, cdata.cnum, tcx,
266 |_, did| translate_def_id(cdata, did));
267 bounds.push(bd.space, bd);
273 fn item_region_param_defs(item_doc: ebml::Doc, cdata: Cmd)
274 -> subst::VecPerParamSpace<ty::RegionParameterDef>
276 let mut v = subst::VecPerParamSpace::empty();
277 reader::tagged_docs(item_doc, tag_region_param_def, |rp_doc| {
278 let ident_str_doc = reader::get_doc(rp_doc,
279 tag_region_param_def_ident);
280 let ident = item_name(&*token::get_ident_interner(), ident_str_doc);
281 let def_id_doc = reader::get_doc(rp_doc,
282 tag_region_param_def_def_id);
283 let def_id = reader::with_doc_data(def_id_doc, parse_def_id);
284 let def_id = translate_def_id(cdata, def_id);
286 let doc = reader::get_doc(rp_doc, tag_region_param_def_space);
287 let space = subst::ParamSpace::from_uint(reader::doc_as_u64(doc) as uint);
289 let doc = reader::get_doc(rp_doc, tag_region_param_def_index);
290 let index = reader::doc_as_u64(doc) as uint;
292 v.push(space, ty::RegionParameterDef { name: ident.name,
301 fn enum_variant_ids(item: ebml::Doc, cdata: Cmd) -> Vec<ast::DefId> {
302 let mut ids: Vec<ast::DefId> = Vec::new();
303 let v = tag_items_data_item_variant;
304 reader::tagged_docs(item, v, |p| {
305 let ext = reader::with_doc_data(p, parse_def_id);
306 ids.push(ast::DefId { krate: cdata.cnum, node: ext.node });
312 fn item_path(item_doc: ebml::Doc) -> Vec<ast_map::PathElem> {
313 let path_doc = reader::get_doc(item_doc, tag_path);
315 let len_doc = reader::get_doc(path_doc, tag_path_len);
316 let len = reader::doc_as_u32(len_doc) as uint;
318 let mut result = Vec::with_capacity(len);
319 reader::docs(path_doc, |tag, elt_doc| {
320 if tag == tag_path_elem_mod {
321 let s = elt_doc.as_str_slice();
322 result.push(ast_map::PathMod(token::intern(s)));
323 } else if tag == tag_path_elem_name {
324 let s = elt_doc.as_str_slice();
325 result.push(ast_map::PathName(token::intern(s)));
327 // ignore tag_path_len element
335 fn item_name(intr: &IdentInterner, item: ebml::Doc) -> ast::Ident {
336 let name = reader::get_doc(item, tag_paths_data_name);
337 let string = name.as_str_slice();
338 match intr.find_equiv(&string) {
339 None => token::str_to_ident(string),
340 Some(val) => ast::Ident::new(val as ast::Name),
344 fn item_to_def_like(item: ebml::Doc, did: ast::DefId, cnum: ast::CrateNum)
346 let fam = item_family(item);
348 ImmStatic => DlDef(def::DefStatic(did, false)),
349 MutStatic => DlDef(def::DefStatic(did, true)),
350 Struct => DlDef(def::DefStruct(did)),
351 UnsafeFn => DlDef(def::DefFn(did, ast::UnsafeFn)),
352 Fn => DlDef(def::DefFn(did, ast::NormalFn)),
353 StaticMethod | UnsafeStaticMethod => {
354 let fn_style = if fam == UnsafeStaticMethod { ast::UnsafeFn } else
356 // def_static_method carries an optional field of its enclosing
357 // trait or enclosing impl (if this is an inherent static method).
358 // So we need to detect whether this is in a trait or not, which
359 // we do through the mildly hacky way of checking whether there is
360 // a trait_method_sort.
361 let provenance = if reader::maybe_get_doc(
362 item, tag_item_trait_method_sort).is_some() {
363 def::FromTrait(item_reqd_and_translated_parent_item(cnum,
366 def::FromImpl(item_reqd_and_translated_parent_item(cnum,
369 DlDef(def::DefStaticMethod(did, provenance, fn_style))
371 Type | ForeignType => DlDef(def::DefTy(did)),
372 Mod => DlDef(def::DefMod(did)),
373 ForeignMod => DlDef(def::DefForeignMod(did)),
375 let enum_did = item_reqd_and_translated_parent_item(cnum, item);
376 DlDef(def::DefVariant(enum_did, did, true))
379 let enum_did = item_reqd_and_translated_parent_item(cnum, item);
380 DlDef(def::DefVariant(enum_did, did, false))
382 Trait => DlDef(def::DefTrait(did)),
383 Enum => DlDef(def::DefTy(did)),
385 PublicField | InheritedField => DlField,
389 pub fn get_trait_def(cdata: Cmd,
390 item_id: ast::NodeId,
391 tcx: &ty::ctxt) -> ty::TraitDef
393 let item_doc = lookup_item(item_id, cdata.data());
394 let tp_defs = item_ty_param_defs(item_doc, tcx, cdata,
395 tag_items_data_item_ty_param_bounds);
396 let rp_defs = item_region_param_defs(item_doc, cdata);
397 let sized = item_sized(item_doc);
398 let mut bounds = ty::empty_builtin_bounds();
399 // Collect the builtin bounds from the encoded supertraits.
400 // FIXME(#8559): They should be encoded directly.
401 reader::tagged_docs(item_doc, tag_item_super_trait_ref, |trait_doc| {
402 // NB. Bypasses real supertraits. See get_supertraits() if you wanted them.
403 let trait_ref = doc_trait_ref(trait_doc, tcx, cdata);
404 tcx.lang_items.to_builtin_kind(trait_ref.def_id).map(|bound| {
409 // Turn sized into a bound, FIXME(#8559).
410 if sized == ast::StaticSize {
411 tcx.lang_items.to_builtin_kind(tcx.lang_items.sized_trait().unwrap()).map(|bound| {
417 generics: ty::Generics {types: tp_defs,
420 trait_ref: Rc::new(item_trait_ref(item_doc, tcx, cdata))
424 pub fn get_type(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
427 let item = lookup_item(id, cdata.data());
429 let t = item_type(ast::DefId { krate: cdata.cnum, node: id }, item, tcx,
432 let tp_defs = item_ty_param_defs(item, tcx, cdata, tag_items_data_item_ty_param_bounds);
433 let rp_defs = item_region_param_defs(item, cdata);
436 generics: ty::Generics {types: tp_defs,
442 pub fn get_stability(cdata: Cmd, id: ast::NodeId) -> Option<attr::Stability> {
443 let item = lookup_item(id, cdata.data());
444 reader::maybe_get_doc(item, tag_items_data_item_stability).map(|doc| {
445 let mut decoder = reader::Decoder::new(doc);
446 Decodable::decode(&mut decoder).unwrap()
450 pub fn get_impl_trait(cdata: Cmd,
452 tcx: &ty::ctxt) -> Option<Rc<ty::TraitRef>>
454 let item_doc = lookup_item(id, cdata.data());
455 reader::maybe_get_doc(item_doc, tag_item_trait_ref).map(|tp| {
456 Rc::new(doc_trait_ref(tp, tcx, cdata))
460 pub fn get_impl_vtables(cdata: Cmd,
463 -> typeck::vtable_res
465 let item_doc = lookup_item(id, cdata.data());
466 let vtables_doc = reader::get_doc(item_doc, tag_item_impl_vtables);
467 let mut decoder = reader::Decoder::new(vtables_doc);
468 decoder.read_vtable_res(tcx, cdata)
472 pub fn get_symbol(data: &[u8], id: ast::NodeId) -> String {
473 return item_symbol(lookup_item(id, data));
476 // Something that a name can resolve to.
484 /// Iterates over the language items in the given crate.
485 pub fn each_lang_item(cdata: Cmd, f: |ast::NodeId, uint| -> bool) -> bool {
486 let root = ebml::Doc::new(cdata.data());
487 let lang_items = reader::get_doc(root, tag_lang_items);
488 reader::tagged_docs(lang_items, tag_lang_items_item, |item_doc| {
489 let id_doc = reader::get_doc(item_doc, tag_lang_items_item_id);
490 let id = reader::doc_as_u32(id_doc) as uint;
491 let node_id_doc = reader::get_doc(item_doc,
492 tag_lang_items_item_node_id);
493 let node_id = reader::doc_as_u32(node_id_doc) as ast::NodeId;
499 pub type GetCrateDataCb<'a> = |ast::CrateNum|: 'a -> Rc<crate_metadata>;
501 fn each_child_of_item_or_crate(intr: Rc<IdentInterner>,
504 get_crate_data: GetCrateDataCb,
508 // Iterate over all children.
509 let _ = reader::tagged_docs(item_doc, tag_mod_child, |child_info_doc| {
510 let child_def_id = reader::with_doc_data(child_info_doc,
512 let child_def_id = translate_def_id(cdata, child_def_id);
514 // This item may be in yet another crate if it was the child of a
516 let crate_data = if child_def_id.krate == cdata.cnum {
519 Some(get_crate_data(child_def_id.krate))
521 let crate_data = match crate_data {
522 Some(ref cdata) => &**cdata,
526 let other_crates_items = reader::get_doc(ebml::Doc::new(crate_data.data()), tag_items);
529 match maybe_find_item(child_def_id.node, other_crates_items) {
531 Some(child_item_doc) => {
532 // Hand off the item to the callback.
533 let child_name = item_name(&*intr, child_item_doc);
534 let def_like = item_to_def_like(child_item_doc,
537 let visibility = item_visibility(child_item_doc);
538 callback(def_like, child_name, visibility);
546 // As a special case, iterate over all static methods of
547 // associated implementations too. This is a bit of a botch.
549 let _ = reader::tagged_docs(item_doc,
550 tag_items_data_item_inherent_impl,
551 |inherent_impl_def_id_doc| {
552 let inherent_impl_def_id = item_def_id(inherent_impl_def_id_doc,
554 let items = reader::get_doc(ebml::Doc::new(cdata.data()), tag_items);
555 match maybe_find_item(inherent_impl_def_id.node, items) {
557 Some(inherent_impl_doc) => {
558 let _ = reader::tagged_docs(inherent_impl_doc,
559 tag_item_impl_method,
560 |impl_method_def_id_doc| {
561 let impl_method_def_id =
562 reader::with_doc_data(impl_method_def_id_doc,
564 let impl_method_def_id =
565 translate_def_id(cdata, impl_method_def_id);
566 match maybe_find_item(impl_method_def_id.node, items) {
568 Some(impl_method_doc) => {
569 match item_family(impl_method_doc) {
570 StaticMethod | UnsafeStaticMethod => {
571 // Hand off the static method
573 let static_method_name =
574 item_name(&*intr, impl_method_doc);
575 let static_method_def_like =
576 item_to_def_like(impl_method_doc,
579 callback(static_method_def_like,
581 item_visibility(impl_method_doc));
596 // Iterate over all reexports.
597 let _ = each_reexport(item_doc, |reexport_doc| {
598 let def_id_doc = reader::get_doc(reexport_doc,
599 tag_items_data_item_reexport_def_id);
600 let child_def_id = reader::with_doc_data(def_id_doc,
602 let child_def_id = translate_def_id(cdata, child_def_id);
604 let name_doc = reader::get_doc(reexport_doc,
605 tag_items_data_item_reexport_name);
606 let name = name_doc.as_str_slice();
608 // This reexport may be in yet another crate.
609 let crate_data = if child_def_id.krate == cdata.cnum {
612 Some(get_crate_data(child_def_id.krate))
614 let crate_data = match crate_data {
615 Some(ref cdata) => &**cdata,
619 let other_crates_items = reader::get_doc(ebml::Doc::new(crate_data.data()), tag_items);
622 match maybe_find_item(child_def_id.node, other_crates_items) {
624 Some(child_item_doc) => {
625 // Hand off the item to the callback.
626 let def_like = item_to_def_like(child_item_doc,
629 // These items have a public visibility because they're part of
630 // a public re-export.
631 callback(def_like, token::str_to_ident(name), ast::Public);
639 /// Iterates over each child of the given item.
640 pub fn each_child_of_item(intr: Rc<IdentInterner>,
643 get_crate_data: GetCrateDataCb,
644 callback: |DefLike, ast::Ident, ast::Visibility|) {
646 let root_doc = ebml::Doc::new(cdata.data());
647 let items = reader::get_doc(root_doc, tag_items);
648 let item_doc = match maybe_find_item(id, items) {
650 Some(item_doc) => item_doc,
653 each_child_of_item_or_crate(intr,
660 /// Iterates over all the top-level crate items.
661 pub fn each_top_level_item_of_crate(intr: Rc<IdentInterner>,
663 get_crate_data: GetCrateDataCb,
667 let root_doc = ebml::Doc::new(cdata.data());
668 let misc_info_doc = reader::get_doc(root_doc, tag_misc_info);
669 let crate_items_doc = reader::get_doc(misc_info_doc,
670 tag_misc_info_crate_items);
672 each_child_of_item_or_crate(intr,
679 pub fn get_item_path(cdata: Cmd, id: ast::NodeId) -> Vec<ast_map::PathElem> {
680 item_path(lookup_item(id, cdata.data()))
683 pub type DecodeInlinedItem<'a> = |cdata: Cmd,
685 path: Vec<ast_map::PathElem>,
686 par_doc: ebml::Doc|: 'a
687 -> Result<ast::InlinedItem, Vec<ast_map::PathElem> >;
689 pub fn maybe_get_item_ast(cdata: Cmd, tcx: &ty::ctxt, id: ast::NodeId,
690 decode_inlined_item: DecodeInlinedItem)
691 -> csearch::found_ast {
692 debug!("Looking up item: {}", id);
693 let item_doc = lookup_item(id, cdata.data());
694 let path = Vec::from_slice(item_path(item_doc).init());
695 match decode_inlined_item(cdata, tcx, path, item_doc) {
696 Ok(ref ii) => csearch::found(*ii),
698 match item_parent_item(item_doc) {
700 let did = translate_def_id(cdata, did);
701 let parent_item = lookup_item(did.node, cdata.data());
702 match decode_inlined_item(cdata, tcx, path, parent_item) {
703 Ok(ref ii) => csearch::found_parent(did, *ii),
704 Err(_) => csearch::not_found
707 None => csearch::not_found
713 pub fn get_enum_variants(intr: Rc<IdentInterner>, cdata: Cmd, id: ast::NodeId,
714 tcx: &ty::ctxt) -> Vec<Rc<ty::VariantInfo>> {
715 let data = cdata.data();
716 let items = reader::get_doc(ebml::Doc::new(data), tag_items);
717 let item = find_item(id, items);
718 let mut disr_val = 0;
719 enum_variant_ids(item, cdata).iter().map(|did| {
720 let item = find_item(did.node, items);
721 let ctor_ty = item_type(ast::DefId { krate: cdata.cnum, node: id},
723 let name = item_name(&*intr, item);
724 let arg_tys = match ty::get(ctor_ty).sty {
725 ty::ty_bare_fn(ref f) => f.sig.inputs.clone(),
726 _ => Vec::new(), // Nullary enum variant.
728 match variant_disr_val(item) {
729 Some(val) => { disr_val = val; }
732 let old_disr_val = disr_val;
734 Rc::new(ty::VariantInfo {
739 // I'm not even sure if we encode visibility
740 // for variants -- TEST -- tjc
742 disr_val: old_disr_val,
748 fn get_explicit_self(item: ebml::Doc) -> ast::ExplicitSelf_ {
749 fn get_mutability(ch: u8) -> ast::Mutability {
751 'i' => ast::MutImmutable,
752 'm' => ast::MutMutable,
753 _ => fail!("unknown mutability character: `{}`", ch as char),
757 let explicit_self_doc = reader::get_doc(item, tag_item_trait_method_explicit_self);
758 let string = explicit_self_doc.as_str_slice();
760 let explicit_self_kind = string.as_bytes()[0];
761 match explicit_self_kind as char {
762 's' => ast::SelfStatic,
763 'v' => ast::SelfValue,
764 '~' => ast::SelfUniq,
765 // FIXME(#4846) expl. region
766 '&' => ast::SelfRegion(None, get_mutability(string.as_bytes()[1])),
767 _ => fail!("unknown self type code: `{}`", explicit_self_kind as char)
771 /// Returns information about the given implementation.
772 pub fn get_impl_methods(cdata: Cmd, impl_id: ast::NodeId) -> Vec<ast::DefId> {
773 let mut methods = Vec::new();
774 reader::tagged_docs(lookup_item(impl_id, cdata.data()),
775 tag_item_impl_method, |doc| {
776 let m_did = reader::with_doc_data(doc, parse_def_id);
777 methods.push(translate_def_id(cdata, m_did));
784 pub fn get_method_name_and_explicit_self(
785 intr: Rc<IdentInterner>,
787 id: ast::NodeId) -> (ast::Ident, ast::ExplicitSelf_)
789 let method_doc = lookup_item(id, cdata.data());
790 let name = item_name(&*intr, method_doc);
791 let explicit_self = get_explicit_self(method_doc);
792 (name, explicit_self)
795 pub fn get_method(intr: Rc<IdentInterner>, cdata: Cmd, id: ast::NodeId,
796 tcx: &ty::ctxt) -> ty::Method
798 let method_doc = lookup_item(id, cdata.data());
799 let def_id = item_def_id(method_doc, cdata);
801 let container_id = item_reqd_and_translated_parent_item(cdata.cnum,
803 let container_doc = lookup_item(container_id.node, cdata.data());
804 let container = match item_family(container_doc) {
805 Trait => TraitContainer(container_id),
806 _ => ImplContainer(container_id),
809 let name = item_name(&*intr, method_doc);
810 let type_param_defs = item_ty_param_defs(method_doc, tcx, cdata,
811 tag_item_method_tps);
812 let rp_defs = item_region_param_defs(method_doc, cdata);
813 let fty = doc_method_fty(method_doc, tcx, cdata);
814 let vis = item_visibility(method_doc);
815 let explicit_self = get_explicit_self(method_doc);
816 let provided_source = get_provided_source(method_doc, cdata);
821 types: type_param_defs,
833 pub fn get_trait_method_def_ids(cdata: Cmd,
834 id: ast::NodeId) -> Vec<ast::DefId> {
835 let data = cdata.data();
836 let item = lookup_item(id, data);
837 let mut result = Vec::new();
838 reader::tagged_docs(item, tag_item_trait_method, |mth| {
839 result.push(item_def_id(mth, cdata));
845 pub fn get_item_variances(cdata: Cmd, id: ast::NodeId) -> ty::ItemVariances {
846 let data = cdata.data();
847 let item_doc = lookup_item(id, data);
848 let variance_doc = reader::get_doc(item_doc, tag_item_variances);
849 let mut decoder = reader::Decoder::new(variance_doc);
850 Decodable::decode(&mut decoder).unwrap()
853 pub fn get_provided_trait_methods(intr: Rc<IdentInterner>, cdata: Cmd,
854 id: ast::NodeId, tcx: &ty::ctxt)
855 -> Vec<Rc<ty::Method>> {
856 let data = cdata.data();
857 let item = lookup_item(id, data);
858 let mut result = Vec::new();
860 reader::tagged_docs(item, tag_item_trait_method, |mth_id| {
861 let did = item_def_id(mth_id, cdata);
862 let mth = lookup_item(did.node, data);
864 if item_method_sort(mth) == 'p' {
865 result.push(Rc::new(get_method(intr.clone(), cdata, did.node, tcx)));
873 /// Returns the supertraits of the given trait.
874 pub fn get_supertraits(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
875 -> Vec<Rc<ty::TraitRef>> {
876 let mut results = Vec::new();
877 let item_doc = lookup_item(id, cdata.data());
878 reader::tagged_docs(item_doc, tag_item_super_trait_ref, |trait_doc| {
879 // NB. Only reads the ones that *aren't* builtin-bounds. See also
880 // get_trait_def() for collecting the builtin bounds.
881 // FIXME(#8559): The builtin bounds shouldn't be encoded in the first place.
882 let trait_ref = doc_trait_ref(trait_doc, tcx, cdata);
883 if tcx.lang_items.to_builtin_kind(trait_ref.def_id).is_none() {
884 results.push(Rc::new(trait_ref));
891 pub fn get_type_name_if_impl(cdata: Cmd,
892 node_id: ast::NodeId) -> Option<ast::Ident> {
893 let item = lookup_item(node_id, cdata.data());
894 if item_family(item) != Impl {
899 reader::tagged_docs(item, tag_item_impl_type_basename, |doc| {
900 ret = Some(token::str_to_ident(doc.as_str_slice()));
907 pub fn get_static_methods_if_impl(intr: Rc<IdentInterner>,
909 node_id: ast::NodeId)
910 -> Option<Vec<StaticMethodInfo> > {
911 let item = lookup_item(node_id, cdata.data());
912 if item_family(item) != Impl {
916 // If this impl implements a trait, don't consider it.
917 let ret = reader::tagged_docs(item, tag_item_trait_ref, |_doc| {
921 if !ret { return None }
923 let mut impl_method_ids = Vec::new();
924 reader::tagged_docs(item, tag_item_impl_method, |impl_method_doc| {
925 impl_method_ids.push(reader::with_doc_data(impl_method_doc, parse_def_id));
929 let mut static_impl_methods = Vec::new();
930 for impl_method_id in impl_method_ids.iter() {
931 let impl_method_doc = lookup_item(impl_method_id.node, cdata.data());
932 let family = item_family(impl_method_doc);
934 StaticMethod | UnsafeStaticMethod => {
936 match item_family(impl_method_doc) {
937 StaticMethod => fn_style = ast::NormalFn,
938 UnsafeStaticMethod => fn_style = ast::UnsafeFn,
942 static_impl_methods.push(StaticMethodInfo {
943 ident: item_name(&*intr, impl_method_doc),
944 def_id: item_def_id(impl_method_doc, cdata),
946 vis: item_visibility(impl_method_doc),
953 return Some(static_impl_methods);
956 /// If node_id is the constructor of a tuple struct, retrieve the NodeId of
957 /// the actual type definition, otherwise, return None
958 pub fn get_tuple_struct_definition_if_ctor(cdata: Cmd,
959 node_id: ast::NodeId)
960 -> Option<ast::DefId>
962 let item = lookup_item(node_id, cdata.data());
964 reader::tagged_docs(item, tag_items_data_item_is_tuple_struct_ctor, |_| {
965 ret = Some(item_reqd_and_translated_parent_item(cdata.cnum, item));
971 pub fn get_item_attrs(cdata: Cmd,
972 orig_node_id: ast::NodeId,
973 f: |Vec<ast::Attribute>|) {
974 // The attributes for a tuple struct are attached to the definition, not the ctor;
975 // we assume that someone passing in a tuple struct ctor is actually wanting to
976 // look at the definition
977 let node_id = get_tuple_struct_definition_if_ctor(cdata, orig_node_id);
978 let node_id = node_id.map(|x| x.node).unwrap_or(orig_node_id);
979 let item = lookup_item(node_id, cdata.data());
980 f(get_attributes(item));
983 fn struct_field_family_to_visibility(family: Family) -> ast::Visibility {
985 PublicField => ast::Public,
986 InheritedField => ast::Inherited,
991 pub fn get_struct_fields(intr: Rc<IdentInterner>, cdata: Cmd, id: ast::NodeId)
992 -> Vec<ty::field_ty> {
993 let data = cdata.data();
994 let item = lookup_item(id, data);
995 let mut result = Vec::new();
996 reader::tagged_docs(item, tag_item_field, |an_item| {
997 let f = item_family(an_item);
998 if f == PublicField || f == InheritedField {
999 // FIXME #6993: name should be of type Name, not Ident
1000 let name = item_name(&*intr, an_item);
1001 let did = item_def_id(an_item, cdata);
1002 let tagdoc = reader::get_doc(an_item, tag_item_field_origin);
1003 let origin_id = translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
1004 result.push(ty::field_ty {
1007 vis: struct_field_family_to_visibility(f),
1013 reader::tagged_docs(item, tag_item_unnamed_field, |an_item| {
1014 let did = item_def_id(an_item, cdata);
1015 let tagdoc = reader::get_doc(an_item, tag_item_field_origin);
1016 let f = item_family(an_item);
1017 let origin_id = translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
1018 result.push(ty::field_ty {
1019 name: special_idents::unnamed_field.name,
1021 vis: struct_field_family_to_visibility(f),
1029 fn get_meta_items(md: ebml::Doc) -> Vec<Gc<ast::MetaItem>> {
1030 let mut items: Vec<Gc<ast::MetaItem>> = Vec::new();
1031 reader::tagged_docs(md, tag_meta_item_word, |meta_item_doc| {
1032 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1033 let n = token::intern_and_get_ident(nd.as_str_slice());
1034 items.push(attr::mk_word_item(n));
1037 reader::tagged_docs(md, tag_meta_item_name_value, |meta_item_doc| {
1038 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1039 let vd = reader::get_doc(meta_item_doc, tag_meta_item_value);
1040 let n = token::intern_and_get_ident(nd.as_str_slice());
1041 let v = token::intern_and_get_ident(vd.as_str_slice());
1042 // FIXME (#623): Should be able to decode MetaNameValue variants,
1043 // but currently the encoder just drops them
1044 items.push(attr::mk_name_value_item_str(n, v));
1047 reader::tagged_docs(md, tag_meta_item_list, |meta_item_doc| {
1048 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1049 let n = token::intern_and_get_ident(nd.as_str_slice());
1050 let subitems = get_meta_items(meta_item_doc);
1051 items.push(attr::mk_list_item(n, subitems.move_iter().collect()));
1057 fn get_attributes(md: ebml::Doc) -> Vec<ast::Attribute> {
1058 let mut attrs: Vec<ast::Attribute> = Vec::new();
1059 match reader::maybe_get_doc(md, tag_attributes) {
1061 reader::tagged_docs(attrs_d, tag_attribute, |attr_doc| {
1062 let meta_items = get_meta_items(attr_doc);
1063 // Currently it's only possible to have a single meta item on
1065 assert_eq!(meta_items.len(), 1u);
1066 let meta_item = *meta_items.get(0);
1069 node: ast::Attribute_ {
1070 id: attr::mk_attr_id(),
1071 style: ast::AttrOuter,
1073 is_sugared_doc: false,
1075 span: codemap::DUMMY_SP
1085 fn list_crate_attributes(md: ebml::Doc, hash: &Svh,
1086 out: &mut io::Writer) -> io::IoResult<()> {
1087 try!(write!(out, "=Crate Attributes ({})=\n", *hash));
1089 let r = get_attributes(md);
1090 for attr in r.iter() {
1091 try!(write!(out, "{}\n", pprust::attribute_to_str(attr)));
1097 pub fn get_crate_attributes(data: &[u8]) -> Vec<ast::Attribute> {
1098 get_attributes(ebml::Doc::new(data))
1102 pub struct CrateDep {
1103 pub cnum: ast::CrateNum,
1104 pub crate_id: CrateId,
1108 pub fn get_crate_deps(data: &[u8]) -> Vec<CrateDep> {
1109 let mut deps: Vec<CrateDep> = Vec::new();
1110 let cratedoc = ebml::Doc::new(data);
1111 let depsdoc = reader::get_doc(cratedoc, tag_crate_deps);
1112 let mut crate_num = 1;
1113 fn docstr(doc: ebml::Doc, tag_: uint) -> String {
1114 let d = reader::get_doc(doc, tag_);
1115 d.as_str_slice().to_string()
1117 reader::tagged_docs(depsdoc, tag_crate_dep, |depdoc| {
1119 from_str(docstr(depdoc,
1120 tag_crate_dep_crateid).as_slice()).unwrap();
1121 let hash = Svh::new(docstr(depdoc, tag_crate_dep_hash).as_slice());
1122 deps.push(CrateDep {
1133 fn list_crate_deps(data: &[u8], out: &mut io::Writer) -> io::IoResult<()> {
1134 try!(write!(out, "=External Dependencies=\n"));
1135 for dep in get_crate_deps(data).iter() {
1136 try!(write!(out, "{} {}-{}\n", dep.cnum, dep.crate_id, dep.hash));
1138 try!(write!(out, "\n"));
1142 pub fn maybe_get_crate_hash(data: &[u8]) -> Option<Svh> {
1143 let cratedoc = ebml::Doc::new(data);
1144 reader::maybe_get_doc(cratedoc, tag_crate_hash).map(|doc| {
1145 Svh::new(doc.as_str_slice())
1149 pub fn get_crate_hash(data: &[u8]) -> Svh {
1150 let cratedoc = ebml::Doc::new(data);
1151 let hashdoc = reader::get_doc(cratedoc, tag_crate_hash);
1152 Svh::new(hashdoc.as_str_slice())
1155 pub fn maybe_get_crate_id(data: &[u8]) -> Option<CrateId> {
1156 let cratedoc = ebml::Doc::new(data);
1157 reader::maybe_get_doc(cratedoc, tag_crate_crateid).map(|doc| {
1158 from_str(doc.as_str_slice()).unwrap()
1162 pub fn get_crate_triple(data: &[u8]) -> String {
1163 let cratedoc = ebml::Doc::new(data);
1164 let triple_doc = reader::maybe_get_doc(cratedoc, tag_crate_triple);
1165 triple_doc.expect("No triple in crate").as_str().to_string()
1168 pub fn get_crate_id(data: &[u8]) -> CrateId {
1169 let cratedoc = ebml::Doc::new(data);
1170 let hashdoc = reader::get_doc(cratedoc, tag_crate_crateid);
1171 from_str(hashdoc.as_str_slice()).unwrap()
1174 pub fn list_crate_metadata(bytes: &[u8], out: &mut io::Writer) -> io::IoResult<()> {
1175 let hash = get_crate_hash(bytes);
1176 let md = ebml::Doc::new(bytes);
1177 try!(list_crate_attributes(md, &hash, out));
1178 list_crate_deps(bytes, out)
1181 // Translates a def_id from an external crate to a def_id for the current
1182 // compilation environment. We use this when trying to load types from
1183 // external crates - if those types further refer to types in other crates
1184 // then we must translate the crate number from that encoded in the external
1185 // crate to the correct local crate number.
1186 pub fn translate_def_id(cdata: Cmd, did: ast::DefId) -> ast::DefId {
1187 if did.krate == ast::LOCAL_CRATE {
1188 return ast::DefId { krate: cdata.cnum, node: did.node };
1191 match cdata.cnum_map.find(&did.krate) {
1198 None => fail!("didn't find a crate in the cnum_map")
1202 pub fn each_impl(cdata: Cmd, callback: |ast::DefId|) {
1203 let impls_doc = reader::get_doc(ebml::Doc::new(cdata.data()), tag_impls);
1204 let _ = reader::tagged_docs(impls_doc, tag_impls_impl, |impl_doc| {
1205 callback(item_def_id(impl_doc, cdata));
1210 pub fn each_implementation_for_type(cdata: Cmd,
1212 callback: |ast::DefId|) {
1213 let item_doc = lookup_item(id, cdata.data());
1214 reader::tagged_docs(item_doc,
1215 tag_items_data_item_inherent_impl,
1217 let implementation_def_id = item_def_id(impl_doc, cdata);
1218 callback(implementation_def_id);
1223 pub fn each_implementation_for_trait(cdata: Cmd,
1225 callback: |ast::DefId|) {
1226 let item_doc = lookup_item(id, cdata.data());
1228 let _ = reader::tagged_docs(item_doc,
1229 tag_items_data_item_extension_impl,
1231 let implementation_def_id = item_def_id(impl_doc, cdata);
1232 callback(implementation_def_id);
1237 pub fn get_trait_of_method(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
1238 -> Option<ast::DefId> {
1239 let item_doc = lookup_item(id, cdata.data());
1240 let parent_item_id = match item_parent_item(item_doc) {
1241 None => return None,
1242 Some(item_id) => item_id,
1244 let parent_item_id = translate_def_id(cdata, parent_item_id);
1245 let parent_item_doc = lookup_item(parent_item_id.node, cdata.data());
1246 match item_family(parent_item_doc) {
1247 Trait => Some(item_def_id(parent_item_doc, cdata)),
1249 reader::maybe_get_doc(parent_item_doc, tag_item_trait_ref)
1250 .map(|_| item_trait_ref(parent_item_doc, tcx, cdata).def_id)
1257 pub fn get_native_libraries(cdata: Cmd)
1258 -> Vec<(cstore::NativeLibaryKind, String)> {
1259 let libraries = reader::get_doc(ebml::Doc::new(cdata.data()),
1260 tag_native_libraries);
1261 let mut result = Vec::new();
1262 reader::tagged_docs(libraries, tag_native_libraries_lib, |lib_doc| {
1263 let kind_doc = reader::get_doc(lib_doc, tag_native_libraries_kind);
1264 let name_doc = reader::get_doc(lib_doc, tag_native_libraries_name);
1265 let kind: cstore::NativeLibaryKind =
1266 FromPrimitive::from_u32(reader::doc_as_u32(kind_doc)).unwrap();
1267 let name = name_doc.as_str().to_string();
1268 result.push((kind, name));
1274 pub fn get_plugin_registrar_fn(data: &[u8]) -> Option<ast::NodeId> {
1275 reader::maybe_get_doc(ebml::Doc::new(data), tag_plugin_registrar_fn)
1276 .map(|doc| FromPrimitive::from_u32(reader::doc_as_u32(doc)).unwrap())
1279 pub fn get_exported_macros(data: &[u8]) -> Vec<String> {
1280 let macros = reader::get_doc(ebml::Doc::new(data),
1281 tag_exported_macros);
1282 let mut result = Vec::new();
1283 reader::tagged_docs(macros, tag_macro_def, |macro_doc| {
1284 result.push(macro_doc.as_str().to_string());
1290 pub fn get_dylib_dependency_formats(cdata: Cmd)
1291 -> Vec<(ast::CrateNum, cstore::LinkagePreference)>
1293 let formats = reader::get_doc(ebml::Doc::new(cdata.data()),
1294 tag_dylib_dependency_formats);
1295 let mut result = Vec::new();
1297 debug!("found dylib deps: {}", formats.as_str_slice());
1298 for spec in formats.as_str_slice().split(',') {
1299 if spec.len() == 0 { continue }
1300 let cnum = spec.split(':').nth(0).unwrap();
1301 let link = spec.split(':').nth(1).unwrap();
1302 let cnum = from_str(cnum).unwrap();
1303 let cnum = match cdata.cnum_map.find(&cnum) {
1305 None => fail!("didn't find a crate in the cnum_map")
1307 result.push((cnum, if link == "d" {
1308 cstore::RequireDynamic
1310 cstore::RequireStatic
1316 pub fn get_missing_lang_items(cdata: Cmd)
1317 -> Vec<lang_items::LangItem>
1319 let items = reader::get_doc(ebml::Doc::new(cdata.data()), tag_lang_items);
1320 let mut result = Vec::new();
1321 reader::tagged_docs(items, tag_lang_items_missing, |missing_doc| {
1322 let item: lang_items::LangItem =
1323 FromPrimitive::from_u32(reader::doc_as_u32(missing_doc)).unwrap();
1330 pub fn get_method_arg_names(cdata: Cmd, id: ast::NodeId) -> Vec<String> {
1331 let mut ret = Vec::new();
1332 let method_doc = lookup_item(id, cdata.data());
1333 match reader::maybe_get_doc(method_doc, tag_method_argument_names) {
1335 reader::tagged_docs(args_doc, tag_method_argument_name, |name_doc| {
1336 ret.push(name_doc.as_str_slice().to_string());
1345 pub fn get_reachable_extern_fns(cdata: Cmd) -> Vec<ast::DefId> {
1346 let mut ret = Vec::new();
1347 let items = reader::get_doc(ebml::Doc::new(cdata.data()),
1348 tag_reachable_extern_fns);
1349 reader::tagged_docs(items, tag_reachable_extern_fn_id, |doc| {
1350 ret.push(ast::DefId {
1352 node: reader::doc_as_u32(doc),
1359 pub fn is_typedef(cdata: Cmd, id: ast::NodeId) -> bool {
1360 let item_doc = lookup_item(id, cdata.data());
1361 match item_family(item_doc) {