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_region_data, parse_def_id,
22 parse_type_param_def_data, parse_bounds_data,
23 parse_bare_fn_ty_data, parse_trait_ref_data};
25 use middle::lang_items;
26 use middle::resolve::TraitItemKind;
28 use middle::ty::{ImplContainer, TraitContainer};
31 use middle::astencode::vtable_decoder_helpers;
35 use std::io::extensions::u64_from_be_bytes;
37 use std::collections::hashmap::HashMap;
42 use serialize::Decodable;
45 use syntax::parse::token::{IdentInterner, special_idents};
46 use syntax::parse::token;
47 use syntax::print::pprust;
52 pub type Cmd<'a> = &'a crate_metadata;
54 // A function that takes a def_id relative to the crate being searched and
55 // returns a def_id relative to the compilation environment, i.e. if we hit a
56 // def_id for an item defined in another crate, somebody needs to figure out
57 // what crate that's in and give us a def_id that makes sense for the current
60 fn lookup_hash<'a>(d: rbml::Doc<'a>, eq_fn: |&[u8]| -> bool,
61 hash: u64) -> Option<rbml::Doc<'a>> {
62 let index = reader::get_doc(d, tag_index);
63 let table = reader::get_doc(index, tag_index_table);
64 let hash_pos = table.start + (hash % 256 * 4) as uint;
65 let pos = u64_from_be_bytes(d.data, hash_pos, 4) as uint;
66 let tagged_doc = reader::doc_at(d.data, pos).unwrap();
68 let belt = tag_index_buckets_bucket_elt;
71 reader::tagged_docs(tagged_doc.doc, belt, |elt| {
72 let pos = u64_from_be_bytes(elt.data, elt.start, 4) as uint;
73 if eq_fn(elt.data.slice(elt.start + 4, elt.end)) {
74 ret = Some(reader::doc_at(d.data, pos).unwrap().doc);
83 pub fn maybe_find_item<'a>(item_id: ast::NodeId,
84 items: rbml::Doc<'a>) -> Option<rbml::Doc<'a>> {
85 fn eq_item(bytes: &[u8], item_id: ast::NodeId) -> bool {
86 return u64_from_be_bytes(
87 bytes.slice(0u, 4u), 0u, 4u) as ast::NodeId
91 |a| eq_item(a, item_id),
92 hash::hash(&(item_id as i64)))
95 fn find_item<'a>(item_id: ast::NodeId, items: rbml::Doc<'a>) -> rbml::Doc<'a> {
96 match maybe_find_item(item_id, items) {
97 None => fail!("lookup_item: id not found: {}", item_id),
102 // Looks up an item in the given metadata and returns an rbml doc pointing
104 fn lookup_item<'a>(item_id: ast::NodeId, data: &'a [u8]) -> rbml::Doc<'a> {
105 let items = reader::get_doc(rbml::Doc::new(data), tag_items);
106 find_item(item_id, items)
109 #[deriving(PartialEq)]
116 UnsafeStaticMethod, // U
131 fn item_family(item: rbml::Doc) -> Family {
132 let fam = reader::get_doc(item, tag_items_data_item_family);
133 match reader::doc_as_u8(fam) as char {
139 'U' => UnsafeStaticMethod,
146 'V' => StructVariant,
151 'N' => InheritedField,
152 c => fail!("unexpected family char: {}", c)
156 fn item_visibility(item: rbml::Doc) -> ast::Visibility {
157 match reader::maybe_get_doc(item, tag_items_data_item_visibility) {
159 Some(visibility_doc) => {
160 match reader::doc_as_u8(visibility_doc) as char {
162 'i' => ast::Inherited,
163 _ => fail!("unknown visibility character")
169 fn item_sort(item: rbml::Doc) -> char {
171 reader::tagged_docs(item, tag_item_trait_item_sort, |doc| {
172 ret = doc.as_str_slice().as_bytes()[0] as char;
178 fn item_symbol(item: rbml::Doc) -> String {
179 reader::get_doc(item, tag_items_data_item_symbol).as_str().to_string()
182 fn item_parent_item(d: rbml::Doc) -> Option<ast::DefId> {
184 reader::tagged_docs(d, tag_items_data_parent_item, |did| {
185 ret = Some(reader::with_doc_data(did, parse_def_id));
191 fn item_reqd_and_translated_parent_item(cnum: ast::CrateNum,
192 d: rbml::Doc) -> ast::DefId {
193 let trait_did = item_parent_item(d).expect("item without parent");
194 ast::DefId { krate: cnum, node: trait_did.node }
197 fn item_def_id(d: rbml::Doc, cdata: Cmd) -> ast::DefId {
198 let tagdoc = reader::get_doc(d, tag_def_id);
199 return translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
202 fn get_provided_source(d: rbml::Doc, cdata: Cmd) -> Option<ast::DefId> {
203 reader::maybe_get_doc(d, tag_item_method_provided_source).map(|doc| {
204 translate_def_id(cdata, reader::with_doc_data(doc, parse_def_id))
208 fn each_reexport(d: rbml::Doc, f: |rbml::Doc| -> bool) -> bool {
209 reader::tagged_docs(d, tag_items_data_item_reexport, f)
212 fn variant_disr_val(d: rbml::Doc) -> Option<ty::Disr> {
213 reader::maybe_get_doc(d, tag_disr_val).and_then(|val_doc| {
214 reader::with_doc_data(val_doc, |data| u64::parse_bytes(data, 10u))
218 fn doc_type(doc: rbml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::t {
219 let tp = reader::get_doc(doc, tag_items_data_item_type);
220 parse_ty_data(tp.data, cdata.cnum, tp.start, tcx,
221 |_, did| translate_def_id(cdata, did))
224 fn doc_method_fty(doc: rbml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::BareFnTy {
225 let tp = reader::get_doc(doc, tag_item_method_fty);
226 parse_bare_fn_ty_data(tp.data, cdata.cnum, tp.start, tcx,
227 |_, did| translate_def_id(cdata, did))
230 pub fn item_type(_item_id: ast::DefId, item: rbml::Doc,
231 tcx: &ty::ctxt, cdata: Cmd) -> ty::t {
232 doc_type(item, tcx, cdata)
235 fn doc_trait_ref(doc: rbml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::TraitRef {
236 parse_trait_ref_data(doc.data, cdata.cnum, doc.start, tcx,
237 |_, did| translate_def_id(cdata, did))
240 fn item_trait_ref(doc: rbml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::TraitRef {
241 let tp = reader::get_doc(doc, tag_item_trait_ref);
242 doc_trait_ref(tp, tcx, cdata)
245 fn doc_bounds(doc: rbml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::ParamBounds {
246 parse_bounds_data(doc.data, cdata.cnum, doc.start, tcx,
247 |_, did| translate_def_id(cdata, did))
250 fn trait_def_bounds(doc: rbml::Doc, tcx: &ty::ctxt, cdata: Cmd) -> ty::ParamBounds {
251 let d = reader::get_doc(doc, tag_trait_def_bounds);
252 doc_bounds(d, tcx, cdata)
255 fn enum_variant_ids(item: rbml::Doc, cdata: Cmd) -> Vec<ast::DefId> {
256 let mut ids: Vec<ast::DefId> = Vec::new();
257 let v = tag_items_data_item_variant;
258 reader::tagged_docs(item, v, |p| {
259 let ext = reader::with_doc_data(p, parse_def_id);
260 ids.push(ast::DefId { krate: cdata.cnum, node: ext.node });
266 fn item_path(item_doc: rbml::Doc) -> Vec<ast_map::PathElem> {
267 let path_doc = reader::get_doc(item_doc, tag_path);
269 let len_doc = reader::get_doc(path_doc, tag_path_len);
270 let len = reader::doc_as_u32(len_doc) as uint;
272 let mut result = Vec::with_capacity(len);
273 reader::docs(path_doc, |tag, elt_doc| {
274 if tag == tag_path_elem_mod {
275 let s = elt_doc.as_str_slice();
276 result.push(ast_map::PathMod(token::intern(s)));
277 } else if tag == tag_path_elem_name {
278 let s = elt_doc.as_str_slice();
279 result.push(ast_map::PathName(token::intern(s)));
281 // ignore tag_path_len element
289 fn item_name(intr: &IdentInterner, item: rbml::Doc) -> ast::Ident {
290 let name = reader::get_doc(item, tag_paths_data_name);
291 let string = name.as_str_slice();
292 match intr.find_equiv(&string) {
293 None => token::str_to_ident(string),
294 Some(val) => ast::Ident::new(val),
298 fn item_to_def_like(item: rbml::Doc, did: ast::DefId, cnum: ast::CrateNum)
300 let fam = item_family(item);
302 ImmStatic => DlDef(def::DefStatic(did, false)),
303 MutStatic => DlDef(def::DefStatic(did, true)),
304 Struct => DlDef(def::DefStruct(did)),
305 UnsafeFn => DlDef(def::DefFn(did, ast::UnsafeFn)),
306 Fn => DlDef(def::DefFn(did, ast::NormalFn)),
307 StaticMethod | UnsafeStaticMethod => {
308 let fn_style = if fam == UnsafeStaticMethod {
313 // def_static_method carries an optional field of its enclosing
314 // trait or enclosing impl (if this is an inherent static method).
315 // So we need to detect whether this is in a trait or not, which
316 // we do through the mildly hacky way of checking whether there is
317 // a trait_parent_sort.
318 let provenance = if reader::maybe_get_doc(
319 item, tag_item_trait_parent_sort).is_some() {
320 def::FromTrait(item_reqd_and_translated_parent_item(cnum,
323 def::FromImpl(item_reqd_and_translated_parent_item(cnum,
326 DlDef(def::DefStaticMethod(did, provenance, fn_style))
328 Type | ForeignType => DlDef(def::DefTy(did)),
329 Mod => DlDef(def::DefMod(did)),
330 ForeignMod => DlDef(def::DefForeignMod(did)),
332 let enum_did = item_reqd_and_translated_parent_item(cnum, item);
333 DlDef(def::DefVariant(enum_did, did, true))
336 let enum_did = item_reqd_and_translated_parent_item(cnum, item);
337 DlDef(def::DefVariant(enum_did, did, false))
339 Trait => DlDef(def::DefTrait(did)),
340 Enum => DlDef(def::DefTy(did)),
342 PublicField | InheritedField => DlField,
346 pub fn get_trait_def(cdata: Cmd,
347 item_id: ast::NodeId,
348 tcx: &ty::ctxt) -> ty::TraitDef
350 let item_doc = lookup_item(item_id, cdata.data());
351 let generics = doc_generics(item_doc, tcx, cdata, tag_item_generics);
352 let bounds = trait_def_bounds(item_doc, tcx, cdata);
357 trait_ref: Rc::new(item_trait_ref(item_doc, tcx, cdata))
361 pub fn get_type(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
364 let item = lookup_item(id, cdata.data());
366 let t = item_type(ast::DefId { krate: cdata.cnum, node: id }, item, tcx,
369 let generics = doc_generics(item, tcx, cdata, tag_item_generics);
377 pub fn get_stability(cdata: Cmd, id: ast::NodeId) -> Option<attr::Stability> {
378 let item = lookup_item(id, cdata.data());
379 reader::maybe_get_doc(item, tag_items_data_item_stability).map(|doc| {
380 let mut decoder = reader::Decoder::new(doc);
381 Decodable::decode(&mut decoder).unwrap()
385 pub fn get_impl_trait(cdata: Cmd,
387 tcx: &ty::ctxt) -> Option<Rc<ty::TraitRef>>
389 let item_doc = lookup_item(id, cdata.data());
390 reader::maybe_get_doc(item_doc, tag_item_trait_ref).map(|tp| {
391 Rc::new(doc_trait_ref(tp, tcx, cdata))
395 pub fn get_impl_vtables(cdata: Cmd,
398 -> typeck::vtable_res
400 let item_doc = lookup_item(id, cdata.data());
401 let vtables_doc = reader::get_doc(item_doc, tag_item_impl_vtables);
402 let mut decoder = reader::Decoder::new(vtables_doc);
403 decoder.read_vtable_res(tcx, cdata)
407 pub fn get_symbol(data: &[u8], id: ast::NodeId) -> String {
408 return item_symbol(lookup_item(id, data));
411 // Something that a name can resolve to.
419 /// Iterates over the language items in the given crate.
420 pub fn each_lang_item(cdata: Cmd, f: |ast::NodeId, uint| -> bool) -> bool {
421 let root = rbml::Doc::new(cdata.data());
422 let lang_items = reader::get_doc(root, tag_lang_items);
423 reader::tagged_docs(lang_items, tag_lang_items_item, |item_doc| {
424 let id_doc = reader::get_doc(item_doc, tag_lang_items_item_id);
425 let id = reader::doc_as_u32(id_doc) as uint;
426 let node_id_doc = reader::get_doc(item_doc,
427 tag_lang_items_item_node_id);
428 let node_id = reader::doc_as_u32(node_id_doc) as ast::NodeId;
434 pub type GetCrateDataCb<'a> = |ast::CrateNum|: 'a -> Rc<crate_metadata>;
436 fn each_child_of_item_or_crate(intr: Rc<IdentInterner>,
439 get_crate_data: GetCrateDataCb,
443 // Iterate over all children.
444 let _ = reader::tagged_docs(item_doc, tag_mod_child, |child_info_doc| {
445 let child_def_id = reader::with_doc_data(child_info_doc,
447 let child_def_id = translate_def_id(cdata, child_def_id);
449 // This item may be in yet another crate if it was the child of a
451 let crate_data = if child_def_id.krate == cdata.cnum {
454 Some(get_crate_data(child_def_id.krate))
456 let crate_data = match crate_data {
457 Some(ref cdata) => &**cdata,
461 let other_crates_items = reader::get_doc(rbml::Doc::new(crate_data.data()), tag_items);
464 match maybe_find_item(child_def_id.node, other_crates_items) {
466 Some(child_item_doc) => {
467 // Hand off the item to the callback.
468 let child_name = item_name(&*intr, child_item_doc);
469 let def_like = item_to_def_like(child_item_doc,
472 let visibility = item_visibility(child_item_doc);
473 callback(def_like, child_name, visibility);
481 // As a special case, iterate over all static methods of
482 // associated implementations too. This is a bit of a botch.
484 let _ = reader::tagged_docs(item_doc,
485 tag_items_data_item_inherent_impl,
486 |inherent_impl_def_id_doc| {
487 let inherent_impl_def_id = item_def_id(inherent_impl_def_id_doc,
489 let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_items);
490 match maybe_find_item(inherent_impl_def_id.node, items) {
492 Some(inherent_impl_doc) => {
493 let _ = reader::tagged_docs(inherent_impl_doc,
495 |impl_item_def_id_doc| {
496 let impl_item_def_id = item_def_id(impl_item_def_id_doc,
498 match maybe_find_item(impl_item_def_id.node, items) {
500 Some(impl_method_doc) => {
501 match item_family(impl_method_doc) {
502 StaticMethod | UnsafeStaticMethod => {
503 // Hand off the static method
505 let static_method_name =
506 item_name(&*intr, impl_method_doc);
507 let static_method_def_like =
508 item_to_def_like(impl_method_doc,
511 callback(static_method_def_like,
513 item_visibility(impl_method_doc));
528 // Iterate over all reexports.
529 let _ = each_reexport(item_doc, |reexport_doc| {
530 let def_id_doc = reader::get_doc(reexport_doc,
531 tag_items_data_item_reexport_def_id);
532 let child_def_id = reader::with_doc_data(def_id_doc,
534 let child_def_id = translate_def_id(cdata, child_def_id);
536 let name_doc = reader::get_doc(reexport_doc,
537 tag_items_data_item_reexport_name);
538 let name = name_doc.as_str_slice();
540 // This reexport may be in yet another crate.
541 let crate_data = if child_def_id.krate == cdata.cnum {
544 Some(get_crate_data(child_def_id.krate))
546 let crate_data = match crate_data {
547 Some(ref cdata) => &**cdata,
551 let other_crates_items = reader::get_doc(rbml::Doc::new(crate_data.data()), tag_items);
554 match maybe_find_item(child_def_id.node, other_crates_items) {
556 Some(child_item_doc) => {
557 // Hand off the item to the callback.
558 let def_like = item_to_def_like(child_item_doc,
561 // These items have a public visibility because they're part of
562 // a public re-export.
563 callback(def_like, token::str_to_ident(name), ast::Public);
571 /// Iterates over each child of the given item.
572 pub fn each_child_of_item(intr: Rc<IdentInterner>,
575 get_crate_data: GetCrateDataCb,
576 callback: |DefLike, ast::Ident, ast::Visibility|) {
578 let root_doc = rbml::Doc::new(cdata.data());
579 let items = reader::get_doc(root_doc, tag_items);
580 let item_doc = match maybe_find_item(id, items) {
582 Some(item_doc) => item_doc,
585 each_child_of_item_or_crate(intr,
592 /// Iterates over all the top-level crate items.
593 pub fn each_top_level_item_of_crate(intr: Rc<IdentInterner>,
595 get_crate_data: GetCrateDataCb,
599 let root_doc = rbml::Doc::new(cdata.data());
600 let misc_info_doc = reader::get_doc(root_doc, tag_misc_info);
601 let crate_items_doc = reader::get_doc(misc_info_doc,
602 tag_misc_info_crate_items);
604 each_child_of_item_or_crate(intr,
611 pub fn get_item_path(cdata: Cmd, id: ast::NodeId) -> Vec<ast_map::PathElem> {
612 item_path(lookup_item(id, cdata.data()))
615 pub type DecodeInlinedItem<'a> = <'tcx> |cdata: Cmd,
616 tcx: &ty::ctxt<'tcx>,
617 path: Vec<ast_map::PathElem>,
618 par_doc: rbml::Doc|: 'a
619 -> Result<&'tcx ast::InlinedItem,
620 Vec<ast_map::PathElem>>;
622 pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: ast::NodeId,
623 decode_inlined_item: DecodeInlinedItem)
624 -> csearch::found_ast<'tcx> {
625 debug!("Looking up item: {}", id);
626 let item_doc = lookup_item(id, cdata.data());
627 let path = Vec::from_slice(item_path(item_doc).init());
628 match decode_inlined_item(cdata, tcx, path, item_doc) {
629 Ok(ii) => csearch::found(ii),
631 match item_parent_item(item_doc) {
633 let did = translate_def_id(cdata, did);
634 let parent_item = lookup_item(did.node, cdata.data());
635 match decode_inlined_item(cdata, tcx, path, parent_item) {
636 Ok(ii) => csearch::found_parent(did, ii),
637 Err(_) => csearch::not_found
640 None => csearch::not_found
646 pub fn get_enum_variants(intr: Rc<IdentInterner>, cdata: Cmd, id: ast::NodeId,
647 tcx: &ty::ctxt) -> Vec<Rc<ty::VariantInfo>> {
648 let data = cdata.data();
649 let items = reader::get_doc(rbml::Doc::new(data), tag_items);
650 let item = find_item(id, items);
651 let mut disr_val = 0;
652 enum_variant_ids(item, cdata).iter().map(|did| {
653 let item = find_item(did.node, items);
654 let ctor_ty = item_type(ast::DefId { krate: cdata.cnum, node: id},
656 let name = item_name(&*intr, item);
657 let arg_tys = match ty::get(ctor_ty).sty {
658 ty::ty_bare_fn(ref f) => f.sig.inputs.clone(),
659 _ => Vec::new(), // Nullary enum variant.
661 match variant_disr_val(item) {
662 Some(val) => { disr_val = val; }
665 let old_disr_val = disr_val;
667 Rc::new(ty::VariantInfo {
672 // I'm not even sure if we encode visibility
673 // for variants -- TEST -- tjc
675 disr_val: old_disr_val,
681 fn get_explicit_self(item: rbml::Doc) -> ty::ExplicitSelfCategory {
682 fn get_mutability(ch: u8) -> ast::Mutability {
684 'i' => ast::MutImmutable,
685 'm' => ast::MutMutable,
686 _ => fail!("unknown mutability character: `{}`", ch as char),
690 let explicit_self_doc = reader::get_doc(item, tag_item_trait_method_explicit_self);
691 let string = explicit_self_doc.as_str_slice();
693 let explicit_self_kind = string.as_bytes()[0];
694 match explicit_self_kind as char {
695 's' => ty::StaticExplicitSelfCategory,
696 'v' => ty::ByValueExplicitSelfCategory,
697 '~' => ty::ByBoxExplicitSelfCategory,
698 // FIXME(#4846) expl. region
700 ty::ByReferenceExplicitSelfCategory(
702 get_mutability(string.as_bytes()[1]))
704 _ => fail!("unknown self type code: `{}`", explicit_self_kind as char)
708 /// Returns the def IDs of all the items in the given implementation.
709 pub fn get_impl_items(cdata: Cmd, impl_id: ast::NodeId)
710 -> Vec<ty::ImplOrTraitItemId> {
711 let mut impl_items = Vec::new();
712 reader::tagged_docs(lookup_item(impl_id, cdata.data()),
713 tag_item_impl_item, |doc| {
714 let def_id = item_def_id(doc, cdata);
715 match item_sort(doc) {
716 'r' | 'p' => impl_items.push(ty::MethodTraitItemId(def_id)),
717 _ => fail!("unknown impl item sort"),
725 pub fn get_trait_item_name_and_kind(intr: Rc<IdentInterner>,
728 -> (ast::Ident, TraitItemKind) {
729 let doc = lookup_item(id, cdata.data());
730 let name = item_name(&*intr, doc);
731 match item_sort(doc) {
733 let explicit_self = get_explicit_self(doc);
734 (name, TraitItemKind::from_explicit_self_category(explicit_self))
737 fail!("get_trait_item_name_and_kind(): unknown trait item kind \
738 in metadata: `{}`", c)
743 pub fn get_impl_or_trait_item(intr: Rc<IdentInterner>,
747 -> ty::ImplOrTraitItem {
748 let method_doc = lookup_item(id, cdata.data());
750 let def_id = item_def_id(method_doc, cdata);
752 let container_id = item_reqd_and_translated_parent_item(cdata.cnum,
754 let container_doc = lookup_item(container_id.node, cdata.data());
755 let container = match item_family(container_doc) {
756 Trait => TraitContainer(container_id),
757 _ => ImplContainer(container_id),
760 let name = item_name(&*intr, method_doc);
762 match item_sort(method_doc) {
764 let generics = doc_generics(method_doc, tcx, cdata,
765 tag_method_ty_generics);
766 let fty = doc_method_fty(method_doc, tcx, cdata);
767 let vis = item_visibility(method_doc);
768 let explicit_self = get_explicit_self(method_doc);
769 let provided_source = get_provided_source(method_doc, cdata);
771 ty::MethodTraitItem(Rc::new(ty::Method::new(name,
780 _ => fail!("unknown impl/trait item sort"),
784 pub fn get_trait_item_def_ids(cdata: Cmd, id: ast::NodeId)
785 -> Vec<ty::ImplOrTraitItemId> {
786 let data = cdata.data();
787 let item = lookup_item(id, data);
788 let mut result = Vec::new();
789 reader::tagged_docs(item, tag_item_trait_item, |mth| {
790 let def_id = item_def_id(mth, cdata);
791 match item_sort(mth) {
792 'r' | 'p' => result.push(ty::MethodTraitItemId(def_id)),
793 _ => fail!("unknown trait item sort"),
800 pub fn get_item_variances(cdata: Cmd, id: ast::NodeId) -> ty::ItemVariances {
801 let data = cdata.data();
802 let item_doc = lookup_item(id, data);
803 let variance_doc = reader::get_doc(item_doc, tag_item_variances);
804 let mut decoder = reader::Decoder::new(variance_doc);
805 Decodable::decode(&mut decoder).unwrap()
808 pub fn get_provided_trait_methods(intr: Rc<IdentInterner>,
812 -> Vec<Rc<ty::Method>> {
813 let data = cdata.data();
814 let item = lookup_item(id, data);
815 let mut result = Vec::new();
817 reader::tagged_docs(item, tag_item_trait_item, |mth_id| {
818 let did = item_def_id(mth_id, cdata);
819 let mth = lookup_item(did.node, data);
821 if item_sort(mth) == 'p' {
822 let trait_item = get_impl_or_trait_item(intr.clone(),
827 ty::MethodTraitItem(ref method) => {
828 result.push((*method).clone())
838 /// Returns the supertraits of the given trait.
839 pub fn get_supertraits(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
840 -> Vec<Rc<ty::TraitRef>> {
841 let mut results = Vec::new();
842 let item_doc = lookup_item(id, cdata.data());
843 reader::tagged_docs(item_doc, tag_item_super_trait_ref, |trait_doc| {
844 // NB. Only reads the ones that *aren't* builtin-bounds. See also
845 // get_trait_def() for collecting the builtin bounds.
846 // FIXME(#8559): The builtin bounds shouldn't be encoded in the first place.
847 let trait_ref = doc_trait_ref(trait_doc, tcx, cdata);
848 if tcx.lang_items.to_builtin_kind(trait_ref.def_id).is_none() {
849 results.push(Rc::new(trait_ref));
856 pub fn get_type_name_if_impl(cdata: Cmd,
857 node_id: ast::NodeId) -> Option<ast::Ident> {
858 let item = lookup_item(node_id, cdata.data());
859 if item_family(item) != Impl {
864 reader::tagged_docs(item, tag_item_impl_type_basename, |doc| {
865 ret = Some(token::str_to_ident(doc.as_str_slice()));
872 pub fn get_static_methods_if_impl(intr: Rc<IdentInterner>,
874 node_id: ast::NodeId)
875 -> Option<Vec<StaticMethodInfo> > {
876 let item = lookup_item(node_id, cdata.data());
877 if item_family(item) != Impl {
881 // If this impl implements a trait, don't consider it.
882 let ret = reader::tagged_docs(item, tag_item_trait_ref, |_doc| {
886 if !ret { return None }
888 let mut impl_method_ids = Vec::new();
889 reader::tagged_docs(item, tag_item_impl_item, |impl_method_doc| {
890 impl_method_ids.push(item_def_id(impl_method_doc, cdata));
894 let mut static_impl_methods = Vec::new();
895 for impl_method_id in impl_method_ids.iter() {
896 let impl_method_doc = lookup_item(impl_method_id.node, cdata.data());
897 let family = item_family(impl_method_doc);
899 StaticMethod | UnsafeStaticMethod => {
901 match item_family(impl_method_doc) {
902 StaticMethod => fn_style = ast::NormalFn,
903 UnsafeStaticMethod => fn_style = ast::UnsafeFn,
907 static_impl_methods.push(StaticMethodInfo {
908 ident: item_name(&*intr, impl_method_doc),
909 def_id: item_def_id(impl_method_doc, cdata),
911 vis: item_visibility(impl_method_doc),
918 return Some(static_impl_methods);
921 /// If node_id is the constructor of a tuple struct, retrieve the NodeId of
922 /// the actual type definition, otherwise, return None
923 pub fn get_tuple_struct_definition_if_ctor(cdata: Cmd,
924 node_id: ast::NodeId)
925 -> Option<ast::DefId>
927 let item = lookup_item(node_id, cdata.data());
929 reader::tagged_docs(item, tag_items_data_item_is_tuple_struct_ctor, |_| {
930 ret = Some(item_reqd_and_translated_parent_item(cdata.cnum, item));
936 pub fn get_item_attrs(cdata: Cmd,
937 orig_node_id: ast::NodeId,
938 f: |Vec<ast::Attribute>|) {
939 // The attributes for a tuple struct are attached to the definition, not the ctor;
940 // we assume that someone passing in a tuple struct ctor is actually wanting to
941 // look at the definition
942 let node_id = get_tuple_struct_definition_if_ctor(cdata, orig_node_id);
943 let node_id = node_id.map(|x| x.node).unwrap_or(orig_node_id);
944 let item = lookup_item(node_id, cdata.data());
945 f(get_attributes(item));
948 pub fn get_struct_field_attrs(cdata: Cmd) -> HashMap<ast::NodeId, Vec<ast::Attribute>> {
949 let data = rbml::Doc::new(cdata.data());
950 let fields = reader::get_doc(data, tag_struct_fields);
951 let mut map = HashMap::new();
952 reader::tagged_docs(fields, tag_struct_field, |field| {
953 let id = reader::doc_as_u32(reader::get_doc(field, tag_struct_field_id));
954 let attrs = get_attributes(field);
955 map.insert(id, attrs);
961 fn struct_field_family_to_visibility(family: Family) -> ast::Visibility {
963 PublicField => ast::Public,
964 InheritedField => ast::Inherited,
969 pub fn get_struct_fields(intr: Rc<IdentInterner>, cdata: Cmd, id: ast::NodeId)
970 -> Vec<ty::field_ty> {
971 let data = cdata.data();
972 let item = lookup_item(id, data);
973 let mut result = Vec::new();
974 reader::tagged_docs(item, tag_item_field, |an_item| {
975 let f = item_family(an_item);
976 if f == PublicField || f == InheritedField {
977 // FIXME #6993: name should be of type Name, not Ident
978 let name = item_name(&*intr, an_item);
979 let did = item_def_id(an_item, cdata);
980 let tagdoc = reader::get_doc(an_item, tag_item_field_origin);
981 let origin_id = translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
982 result.push(ty::field_ty {
985 vis: struct_field_family_to_visibility(f),
991 reader::tagged_docs(item, tag_item_unnamed_field, |an_item| {
992 let did = item_def_id(an_item, cdata);
993 let tagdoc = reader::get_doc(an_item, tag_item_field_origin);
994 let f = item_family(an_item);
995 let origin_id = translate_def_id(cdata, reader::with_doc_data(tagdoc, parse_def_id));
996 result.push(ty::field_ty {
997 name: special_idents::unnamed_field.name,
999 vis: struct_field_family_to_visibility(f),
1007 fn get_meta_items(md: rbml::Doc) -> Vec<P<ast::MetaItem>> {
1008 let mut items: Vec<P<ast::MetaItem>> = Vec::new();
1009 reader::tagged_docs(md, tag_meta_item_word, |meta_item_doc| {
1010 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1011 let n = token::intern_and_get_ident(nd.as_str_slice());
1012 items.push(attr::mk_word_item(n));
1015 reader::tagged_docs(md, tag_meta_item_name_value, |meta_item_doc| {
1016 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1017 let vd = reader::get_doc(meta_item_doc, tag_meta_item_value);
1018 let n = token::intern_and_get_ident(nd.as_str_slice());
1019 let v = token::intern_and_get_ident(vd.as_str_slice());
1020 // FIXME (#623): Should be able to decode MetaNameValue variants,
1021 // but currently the encoder just drops them
1022 items.push(attr::mk_name_value_item_str(n, v));
1025 reader::tagged_docs(md, tag_meta_item_list, |meta_item_doc| {
1026 let nd = reader::get_doc(meta_item_doc, tag_meta_item_name);
1027 let n = token::intern_and_get_ident(nd.as_str_slice());
1028 let subitems = get_meta_items(meta_item_doc);
1029 items.push(attr::mk_list_item(n, subitems.move_iter().collect()));
1035 fn get_attributes(md: rbml::Doc) -> Vec<ast::Attribute> {
1036 let mut attrs: Vec<ast::Attribute> = Vec::new();
1037 match reader::maybe_get_doc(md, tag_attributes) {
1039 reader::tagged_docs(attrs_d, tag_attribute, |attr_doc| {
1040 let is_sugared_doc = reader::doc_as_u8(
1041 reader::get_doc(attr_doc, tag_attribute_is_sugared_doc)
1043 let meta_items = get_meta_items(attr_doc);
1044 // Currently it's only possible to have a single meta item on
1046 assert_eq!(meta_items.len(), 1u);
1047 let meta_item = meta_items.move_iter().nth(0).unwrap();
1050 node: ast::Attribute_ {
1051 id: attr::mk_attr_id(),
1052 style: ast::AttrOuter,
1054 is_sugared_doc: is_sugared_doc,
1056 span: codemap::DUMMY_SP
1066 fn list_crate_attributes(md: rbml::Doc, hash: &Svh,
1067 out: &mut io::Writer) -> io::IoResult<()> {
1068 try!(write!(out, "=Crate Attributes ({})=\n", *hash));
1070 let r = get_attributes(md);
1071 for attr in r.iter() {
1072 try!(write!(out, "{}\n", pprust::attribute_to_string(attr)));
1078 pub fn get_crate_attributes(data: &[u8]) -> Vec<ast::Attribute> {
1079 get_attributes(rbml::Doc::new(data))
1083 pub struct CrateDep {
1084 pub cnum: ast::CrateNum,
1089 pub fn get_crate_deps(data: &[u8]) -> Vec<CrateDep> {
1090 let mut deps: Vec<CrateDep> = Vec::new();
1091 let cratedoc = rbml::Doc::new(data);
1092 let depsdoc = reader::get_doc(cratedoc, tag_crate_deps);
1093 let mut crate_num = 1;
1094 fn docstr(doc: rbml::Doc, tag_: uint) -> String {
1095 let d = reader::get_doc(doc, tag_);
1096 d.as_str_slice().to_string()
1098 reader::tagged_docs(depsdoc, tag_crate_dep, |depdoc| {
1099 let name = docstr(depdoc, tag_crate_dep_crate_name);
1100 let hash = Svh::new(docstr(depdoc, tag_crate_dep_hash).as_slice());
1101 deps.push(CrateDep {
1112 fn list_crate_deps(data: &[u8], out: &mut io::Writer) -> io::IoResult<()> {
1113 try!(write!(out, "=External Dependencies=\n"));
1114 for dep in get_crate_deps(data).iter() {
1115 try!(write!(out, "{} {}-{}\n", dep.cnum, dep.name, dep.hash));
1117 try!(write!(out, "\n"));
1121 pub fn maybe_get_crate_hash(data: &[u8]) -> Option<Svh> {
1122 let cratedoc = rbml::Doc::new(data);
1123 reader::maybe_get_doc(cratedoc, tag_crate_hash).map(|doc| {
1124 Svh::new(doc.as_str_slice())
1128 pub fn get_crate_hash(data: &[u8]) -> Svh {
1129 let cratedoc = rbml::Doc::new(data);
1130 let hashdoc = reader::get_doc(cratedoc, tag_crate_hash);
1131 Svh::new(hashdoc.as_str_slice())
1134 pub fn maybe_get_crate_name(data: &[u8]) -> Option<String> {
1135 let cratedoc = rbml::Doc::new(data);
1136 reader::maybe_get_doc(cratedoc, tag_crate_crate_name).map(|doc| {
1137 doc.as_str_slice().to_string()
1141 pub fn get_crate_triple(data: &[u8]) -> Option<String> {
1142 let cratedoc = rbml::Doc::new(data);
1143 let triple_doc = reader::maybe_get_doc(cratedoc, tag_crate_triple);
1144 triple_doc.map(|s| s.as_str().to_string())
1147 pub fn get_crate_name(data: &[u8]) -> String {
1148 maybe_get_crate_name(data).expect("no crate name in crate")
1151 pub fn list_crate_metadata(bytes: &[u8], out: &mut io::Writer) -> io::IoResult<()> {
1152 let hash = get_crate_hash(bytes);
1153 let md = rbml::Doc::new(bytes);
1154 try!(list_crate_attributes(md, &hash, out));
1155 list_crate_deps(bytes, out)
1158 // Translates a def_id from an external crate to a def_id for the current
1159 // compilation environment. We use this when trying to load types from
1160 // external crates - if those types further refer to types in other crates
1161 // then we must translate the crate number from that encoded in the external
1162 // crate to the correct local crate number.
1163 pub fn translate_def_id(cdata: Cmd, did: ast::DefId) -> ast::DefId {
1164 if did.krate == ast::LOCAL_CRATE {
1165 return ast::DefId { krate: cdata.cnum, node: did.node };
1168 match cdata.cnum_map.find(&did.krate) {
1175 None => fail!("didn't find a crate in the cnum_map")
1179 pub fn each_impl(cdata: Cmd, callback: |ast::DefId|) {
1180 let impls_doc = reader::get_doc(rbml::Doc::new(cdata.data()), tag_impls);
1181 let _ = reader::tagged_docs(impls_doc, tag_impls_impl, |impl_doc| {
1182 callback(item_def_id(impl_doc, cdata));
1187 pub fn each_implementation_for_type(cdata: Cmd,
1189 callback: |ast::DefId|) {
1190 let item_doc = lookup_item(id, cdata.data());
1191 reader::tagged_docs(item_doc,
1192 tag_items_data_item_inherent_impl,
1194 let implementation_def_id = item_def_id(impl_doc, cdata);
1195 callback(implementation_def_id);
1200 pub fn each_implementation_for_trait(cdata: Cmd,
1202 callback: |ast::DefId|) {
1203 let item_doc = lookup_item(id, cdata.data());
1205 let _ = reader::tagged_docs(item_doc,
1206 tag_items_data_item_extension_impl,
1208 let implementation_def_id = item_def_id(impl_doc, cdata);
1209 callback(implementation_def_id);
1214 pub fn get_trait_of_item(cdata: Cmd, id: ast::NodeId, tcx: &ty::ctxt)
1215 -> Option<ast::DefId> {
1216 let item_doc = lookup_item(id, cdata.data());
1217 let parent_item_id = match item_parent_item(item_doc) {
1218 None => return None,
1219 Some(item_id) => item_id,
1221 let parent_item_id = translate_def_id(cdata, parent_item_id);
1222 let parent_item_doc = lookup_item(parent_item_id.node, cdata.data());
1223 match item_family(parent_item_doc) {
1224 Trait => Some(item_def_id(parent_item_doc, cdata)),
1226 reader::maybe_get_doc(parent_item_doc, tag_item_trait_ref)
1227 .map(|_| item_trait_ref(parent_item_doc, tcx, cdata).def_id)
1234 pub fn get_native_libraries(cdata: Cmd)
1235 -> Vec<(cstore::NativeLibaryKind, String)> {
1236 let libraries = reader::get_doc(rbml::Doc::new(cdata.data()),
1237 tag_native_libraries);
1238 let mut result = Vec::new();
1239 reader::tagged_docs(libraries, tag_native_libraries_lib, |lib_doc| {
1240 let kind_doc = reader::get_doc(lib_doc, tag_native_libraries_kind);
1241 let name_doc = reader::get_doc(lib_doc, tag_native_libraries_name);
1242 let kind: cstore::NativeLibaryKind =
1243 FromPrimitive::from_u32(reader::doc_as_u32(kind_doc)).unwrap();
1244 let name = name_doc.as_str().to_string();
1245 result.push((kind, name));
1251 pub fn get_plugin_registrar_fn(data: &[u8]) -> Option<ast::NodeId> {
1252 reader::maybe_get_doc(rbml::Doc::new(data), tag_plugin_registrar_fn)
1253 .map(|doc| FromPrimitive::from_u32(reader::doc_as_u32(doc)).unwrap())
1256 pub fn get_exported_macros(data: &[u8]) -> Vec<String> {
1257 let macros = reader::get_doc(rbml::Doc::new(data),
1258 tag_exported_macros);
1259 let mut result = Vec::new();
1260 reader::tagged_docs(macros, tag_macro_def, |macro_doc| {
1261 result.push(macro_doc.as_str().to_string());
1267 pub fn get_dylib_dependency_formats(cdata: Cmd)
1268 -> Vec<(ast::CrateNum, cstore::LinkagePreference)>
1270 let formats = reader::get_doc(rbml::Doc::new(cdata.data()),
1271 tag_dylib_dependency_formats);
1272 let mut result = Vec::new();
1274 debug!("found dylib deps: {}", formats.as_str_slice());
1275 for spec in formats.as_str_slice().split(',') {
1276 if spec.len() == 0 { continue }
1277 let cnum = spec.split(':').nth(0).unwrap();
1278 let link = spec.split(':').nth(1).unwrap();
1279 let cnum = from_str(cnum).unwrap();
1280 let cnum = match cdata.cnum_map.find(&cnum) {
1282 None => fail!("didn't find a crate in the cnum_map")
1284 result.push((cnum, if link == "d" {
1285 cstore::RequireDynamic
1287 cstore::RequireStatic
1293 pub fn get_missing_lang_items(cdata: Cmd)
1294 -> Vec<lang_items::LangItem>
1296 let items = reader::get_doc(rbml::Doc::new(cdata.data()), tag_lang_items);
1297 let mut result = Vec::new();
1298 reader::tagged_docs(items, tag_lang_items_missing, |missing_doc| {
1299 let item: lang_items::LangItem =
1300 FromPrimitive::from_u32(reader::doc_as_u32(missing_doc)).unwrap();
1307 pub fn get_method_arg_names(cdata: Cmd, id: ast::NodeId) -> Vec<String> {
1308 let mut ret = Vec::new();
1309 let method_doc = lookup_item(id, cdata.data());
1310 match reader::maybe_get_doc(method_doc, tag_method_argument_names) {
1312 reader::tagged_docs(args_doc, tag_method_argument_name, |name_doc| {
1313 ret.push(name_doc.as_str_slice().to_string());
1322 pub fn get_reachable_extern_fns(cdata: Cmd) -> Vec<ast::DefId> {
1323 let mut ret = Vec::new();
1324 let items = reader::get_doc(rbml::Doc::new(cdata.data()),
1325 tag_reachable_extern_fns);
1326 reader::tagged_docs(items, tag_reachable_extern_fn_id, |doc| {
1327 ret.push(ast::DefId {
1329 node: reader::doc_as_u32(doc),
1336 pub fn is_typedef(cdata: Cmd, id: ast::NodeId) -> bool {
1337 let item_doc = lookup_item(id, cdata.data());
1338 match item_family(item_doc) {
1344 fn doc_generics(base_doc: rbml::Doc,
1350 let doc = reader::get_doc(base_doc, tag);
1352 let mut types = subst::VecPerParamSpace::empty();
1353 reader::tagged_docs(doc, tag_type_param_def, |p| {
1354 let bd = parse_type_param_def_data(
1355 p.data, p.start, cdata.cnum, tcx,
1356 |_, did| translate_def_id(cdata, did));
1357 types.push(bd.space, bd);
1361 let mut regions = subst::VecPerParamSpace::empty();
1362 reader::tagged_docs(doc, tag_region_param_def, |rp_doc| {
1363 let ident_str_doc = reader::get_doc(rp_doc,
1364 tag_region_param_def_ident);
1365 let ident = item_name(&*token::get_ident_interner(), ident_str_doc);
1366 let def_id_doc = reader::get_doc(rp_doc,
1367 tag_region_param_def_def_id);
1368 let def_id = reader::with_doc_data(def_id_doc, parse_def_id);
1369 let def_id = translate_def_id(cdata, def_id);
1371 let doc = reader::get_doc(rp_doc, tag_region_param_def_space);
1372 let space = subst::ParamSpace::from_uint(reader::doc_as_u64(doc) as uint);
1374 let doc = reader::get_doc(rp_doc, tag_region_param_def_index);
1375 let index = reader::doc_as_u64(doc) as uint;
1377 let mut bounds = Vec::new();
1378 reader::tagged_docs(rp_doc, tag_items_data_region, |p| {
1381 p.data, cdata.cnum, p.start, tcx,
1382 |_, did| translate_def_id(cdata, did)));
1386 regions.push(space, ty::RegionParameterDef { name: ident.name,
1395 ty::Generics { types: types, regions: regions }