1 // Copyright 2015 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.
16 use rustc::dep_graph::DepTrackingMapConfig;
17 use rustc::middle::cstore::{CrateStore, CrateSource, LibSource, DepKind,
18 ExternCrate, NativeLibrary, LinkMeta,
19 LinkagePreference, LoadedMacro, EncodedMetadata};
20 use rustc::hir::def::{self, Def};
21 use rustc::middle::lang_items;
22 use rustc::session::Session;
23 use rustc::ty::{self, TyCtxt};
24 use rustc::ty::maps::Providers;
25 use rustc::hir::def_id::{CrateNum, DefId, DefIndex, CRATE_DEF_INDEX, LOCAL_CRATE};
27 use rustc::dep_graph::DepNode;
28 use rustc::hir::map::{DefKey, DefPath, DisambiguatedDefPathData};
29 use rustc::util::nodemap::{NodeSet, DefIdMap};
30 use rustc_back::PanicStrategy;
38 use syntax::parse::filemap_to_stream;
39 use syntax::symbol::Symbol;
40 use syntax_pos::{Span, NO_EXPANSION};
41 use rustc::hir::svh::Svh;
42 use rustc_back::target::Target;
45 use std::collections::BTreeMap;
47 macro_rules! provide {
48 (<$lt:tt> $tcx:ident, $def_id:ident, $cdata:ident $($name:ident => $compute:block)*) => {
49 pub fn provide<$lt>(providers: &mut Providers<$lt>) {
50 $(fn $name<'a, $lt:$lt>($tcx: TyCtxt<'a, $lt, $lt>, $def_id: DefId)
51 -> <ty::queries::$name<$lt> as
52 DepTrackingMapConfig>::Value {
53 assert!(!$def_id.is_local());
55 $tcx.dep_graph.read(DepNode::MetaData($def_id));
57 let $cdata = $tcx.sess.cstore.crate_data_as_rc_any($def_id.krate);
58 let $cdata = $cdata.downcast_ref::<cstore::CrateMetadata>()
59 .expect("CrateStore crated ata is not a CrateMetadata");
63 *providers = Providers {
71 provide! { <'tcx> tcx, def_id, cdata
72 type_of => { cdata.get_type(def_id.index, tcx) }
73 generics_of => { tcx.alloc_generics(cdata.get_generics(def_id.index)) }
74 predicates_of => { cdata.get_predicates(def_id.index, tcx) }
75 super_predicates_of => { cdata.get_super_predicates(def_id.index, tcx) }
77 tcx.alloc_trait_def(cdata.get_trait_def(def_id.index))
79 adt_def => { cdata.get_adt_def(def_id.index, tcx) }
82 tcx.calculate_dtor(def_id, &mut |_,_| Ok(()))
84 variances_of => { Rc::new(cdata.get_item_variances(def_id.index)) }
85 associated_item_def_ids => {
86 let mut result = vec![];
87 cdata.each_child_of_item(def_id.index, |child| result.push(child.def.def_id()));
90 associated_item => { cdata.get_associated_item(def_id.index) }
91 impl_trait_ref => { cdata.get_impl_trait(def_id.index, tcx) }
92 impl_polarity => { cdata.get_impl_polarity(def_id.index) }
93 coerce_unsized_info => {
94 cdata.get_coerce_unsized_info(def_id.index).unwrap_or_else(|| {
95 bug!("coerce_unsized_info: `{:?}` is missing its info", def_id);
99 let mir = cdata.maybe_get_item_mir(tcx, def_id.index).unwrap_or_else(|| {
100 bug!("get_item_mir: missing MIR for `{:?}`", def_id)
103 let mir = tcx.alloc_mir(mir);
105 // Perma-borrow MIR from extern crates to prevent mutation.
106 mem::forget(mir.borrow());
110 mir_const_qualif => { cdata.mir_const_qualif(def_id.index) }
111 typeck_tables_of => { cdata.item_body_tables(def_id.index, tcx) }
112 closure_kind => { cdata.closure_kind(def_id.index) }
113 closure_type => { cdata.closure_ty(def_id.index, tcx) }
114 inherent_impls => { Rc::new(cdata.get_inherent_implementations_for_type(def_id.index)) }
115 is_foreign_item => { cdata.is_foreign_item(def_id.index) }
118 impl CrateStore for cstore::CStore {
119 fn crate_data_as_rc_any(&self, krate: CrateNum) -> Rc<Any> {
120 self.get_crate_data(krate)
123 fn describe_def(&self, def: DefId) -> Option<Def> {
124 self.dep_graph.read(DepNode::MetaData(def));
125 self.get_crate_data(def.krate).get_def(def.index)
128 fn def_span(&self, sess: &Session, def: DefId) -> Span {
129 self.dep_graph.read(DepNode::MetaData(def));
130 self.get_crate_data(def.krate).get_span(def.index, sess)
133 fn stability(&self, def: DefId) -> Option<attr::Stability> {
134 self.dep_graph.read(DepNode::MetaData(def));
135 self.get_crate_data(def.krate).get_stability(def.index)
138 fn deprecation(&self, def: DefId) -> Option<attr::Deprecation> {
139 self.dep_graph.read(DepNode::MetaData(def));
140 self.get_crate_data(def.krate).get_deprecation(def.index)
143 fn visibility(&self, def: DefId) -> ty::Visibility {
144 self.dep_graph.read(DepNode::MetaData(def));
145 self.get_crate_data(def.krate).get_visibility(def.index)
148 fn item_generics_cloned(&self, def: DefId) -> ty::Generics {
149 self.dep_graph.read(DepNode::MetaData(def));
150 self.get_crate_data(def.krate).get_generics(def.index)
153 fn item_attrs(&self, def_id: DefId) -> Rc<[ast::Attribute]>
155 self.dep_graph.read(DepNode::MetaData(def_id));
156 self.get_crate_data(def_id.krate).get_item_attrs(def_id.index)
159 fn fn_arg_names(&self, did: DefId) -> Vec<ast::Name>
161 // FIXME(#38501) We've skipped a `read` on the `HirBody` of
162 // a `fn` when encoding, so the dep-tracking wouldn't work.
163 // This is only used by rustdoc anyway, which shouldn't have
164 // incremental recompilation ever enabled.
165 assert!(!self.dep_graph.is_fully_enabled());
166 self.get_crate_data(did.krate).get_fn_arg_names(did.index)
169 fn implementations_of_trait(&self, filter: Option<DefId>) -> Vec<DefId>
171 if let Some(def_id) = filter {
172 self.dep_graph.read(DepNode::MetaData(def_id));
174 let mut result = vec![];
175 self.iter_crate_data(|_, cdata| {
176 cdata.get_implementations_for_trait(filter, &mut result)
181 fn impl_defaultness(&self, def: DefId) -> hir::Defaultness
183 self.dep_graph.read(DepNode::MetaData(def));
184 self.get_crate_data(def.krate).get_impl_defaultness(def.index)
187 fn impl_parent(&self, impl_def: DefId) -> Option<DefId> {
188 self.dep_graph.read(DepNode::MetaData(impl_def));
189 self.get_crate_data(impl_def.krate).get_parent_impl(impl_def.index)
192 fn trait_of_item(&self, def_id: DefId) -> Option<DefId> {
193 self.dep_graph.read(DepNode::MetaData(def_id));
194 self.get_crate_data(def_id.krate).get_trait_of_item(def_id.index)
197 fn associated_item_cloned(&self, def: DefId) -> ty::AssociatedItem
199 self.dep_graph.read(DepNode::MetaData(def));
200 self.get_crate_data(def.krate).get_associated_item(def.index)
203 fn is_const_fn(&self, did: DefId) -> bool
205 self.dep_graph.read(DepNode::MetaData(did));
206 self.get_crate_data(did.krate).is_const_fn(did.index)
209 fn is_default_impl(&self, impl_did: DefId) -> bool {
210 self.dep_graph.read(DepNode::MetaData(impl_did));
211 self.get_crate_data(impl_did.krate).is_default_impl(impl_did.index)
214 fn is_foreign_item(&self, did: DefId) -> bool {
215 self.get_crate_data(did.krate).is_foreign_item(did.index)
218 fn is_statically_included_foreign_item(&self, def_id: DefId) -> bool
220 self.do_is_statically_included_foreign_item(def_id)
223 fn is_exported_symbol(&self, def_id: DefId) -> bool {
224 self.get_crate_data(def_id.krate).exported_symbols.contains(&def_id.index)
227 fn is_dllimport_foreign_item(&self, def_id: DefId) -> bool {
228 if def_id.krate == LOCAL_CRATE {
229 self.dllimport_foreign_items.borrow().contains(&def_id.index)
231 self.get_crate_data(def_id.krate).is_dllimport_foreign_item(def_id.index)
235 fn dylib_dependency_formats(&self, cnum: CrateNum)
236 -> Vec<(CrateNum, LinkagePreference)>
238 self.get_crate_data(cnum).get_dylib_dependency_formats()
241 fn dep_kind(&self, cnum: CrateNum) -> DepKind
243 self.get_crate_data(cnum).dep_kind.get()
246 fn export_macros(&self, cnum: CrateNum) {
247 if self.get_crate_data(cnum).dep_kind.get() == DepKind::UnexportedMacrosOnly {
248 self.get_crate_data(cnum).dep_kind.set(DepKind::MacrosOnly)
252 fn lang_items(&self, cnum: CrateNum) -> Vec<(DefIndex, usize)>
254 self.get_crate_data(cnum).get_lang_items()
257 fn missing_lang_items(&self, cnum: CrateNum)
258 -> Vec<lang_items::LangItem>
260 self.get_crate_data(cnum).get_missing_lang_items()
263 fn is_staged_api(&self, cnum: CrateNum) -> bool
265 self.get_crate_data(cnum).is_staged_api()
268 fn is_allocator(&self, cnum: CrateNum) -> bool
270 self.get_crate_data(cnum).is_allocator()
273 fn is_panic_runtime(&self, cnum: CrateNum) -> bool
275 self.get_crate_data(cnum).is_panic_runtime()
278 fn is_compiler_builtins(&self, cnum: CrateNum) -> bool {
279 self.get_crate_data(cnum).is_compiler_builtins()
282 fn is_sanitizer_runtime(&self, cnum: CrateNum) -> bool {
283 self.get_crate_data(cnum).is_sanitizer_runtime()
286 fn panic_strategy(&self, cnum: CrateNum) -> PanicStrategy {
287 self.get_crate_data(cnum).panic_strategy()
290 fn crate_name(&self, cnum: CrateNum) -> Symbol
292 self.get_crate_data(cnum).name
295 fn original_crate_name(&self, cnum: CrateNum) -> Symbol
297 self.get_crate_data(cnum).name()
300 fn extern_crate(&self, cnum: CrateNum) -> Option<ExternCrate>
302 self.get_crate_data(cnum).extern_crate.get()
305 fn crate_hash(&self, cnum: CrateNum) -> Svh
307 self.get_crate_hash(cnum)
310 fn crate_disambiguator(&self, cnum: CrateNum) -> Symbol
312 self.get_crate_data(cnum).disambiguator()
315 fn plugin_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>
317 self.get_crate_data(cnum).root.plugin_registrar_fn.map(|index| DefId {
323 fn derive_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>
325 self.get_crate_data(cnum).root.macro_derive_registrar.map(|index| DefId {
331 fn native_libraries(&self, cnum: CrateNum) -> Vec<NativeLibrary>
333 self.get_crate_data(cnum).get_native_libraries()
336 fn exported_symbols(&self, cnum: CrateNum) -> Vec<DefId>
338 self.get_crate_data(cnum).get_exported_symbols()
341 fn is_no_builtins(&self, cnum: CrateNum) -> bool {
342 self.get_crate_data(cnum).is_no_builtins()
345 fn retrace_path(&self,
347 path: &[DisambiguatedDefPathData])
349 let cdata = self.get_crate_data(cnum);
352 .map(|index| DefId { krate: cnum, index: index })
355 /// Returns the `DefKey` for a given `DefId`. This indicates the
356 /// parent `DefId` as well as some idea of what kind of data the
357 /// `DefId` refers to.
358 fn def_key(&self, def: DefId) -> DefKey {
359 // Note: loading the def-key (or def-path) for a def-id is not
360 // a *read* of its metadata. This is because the def-id is
361 // really just an interned shorthand for a def-path, which is the
362 // canonical name for an item.
364 // self.dep_graph.read(DepNode::MetaData(def));
365 self.get_crate_data(def.krate).def_key(def.index)
368 fn def_path(&self, def: DefId) -> DefPath {
369 // See `Note` above in `def_key()` for why this read is
372 // self.dep_graph.read(DepNode::MetaData(def));
373 self.get_crate_data(def.krate).def_path(def.index)
376 fn def_path_hash(&self, def: DefId) -> u64 {
377 self.get_crate_data(def.krate).def_path_hash(def.index)
380 fn struct_field_names(&self, def: DefId) -> Vec<ast::Name>
382 self.dep_graph.read(DepNode::MetaData(def));
383 self.get_crate_data(def.krate).get_struct_field_names(def.index)
386 fn item_children(&self, def_id: DefId) -> Vec<def::Export>
388 self.dep_graph.read(DepNode::MetaData(def_id));
389 let mut result = vec![];
390 self.get_crate_data(def_id.krate)
391 .each_child_of_item(def_id.index, |child| result.push(child));
395 fn load_macro(&self, id: DefId, sess: &Session) -> LoadedMacro {
396 let data = self.get_crate_data(id.krate);
397 if let Some(ref proc_macros) = data.proc_macros {
398 return LoadedMacro::ProcMacro(proc_macros[id.index.as_usize() - 1].1.clone());
401 let (name, def) = data.get_macro(id.index);
402 let source_name = format!("<{} macros>", name);
404 let filemap = sess.parse_sess.codemap().new_filemap(source_name, None, def.body);
405 let local_span = Span { lo: filemap.start_pos, hi: filemap.end_pos, ctxt: NO_EXPANSION };
406 let body = filemap_to_stream(&sess.parse_sess, filemap);
408 // Mark the attrs as used
409 let attrs = data.get_item_attrs(id.index);
410 for attr in attrs.iter() {
411 attr::mark_used(attr);
414 let name = data.def_key(id.index).disambiguated_data.data
415 .get_opt_name().expect("no name in load_macro");
416 sess.imported_macro_spans.borrow_mut()
417 .insert(local_span, (name.to_string(), data.get_span(id.index, sess)));
419 LoadedMacro::MacroDef(ast::Item {
420 ident: ast::Ident::with_empty_ctxt(name),
421 id: ast::DUMMY_NODE_ID,
423 attrs: attrs.iter().cloned().collect(),
424 node: ast::ItemKind::MacroDef(body.into()),
425 vis: ast::Visibility::Inherited,
429 fn item_body<'a, 'tcx>(&self,
430 tcx: TyCtxt<'a, 'tcx, 'tcx>,
433 if let Some(cached) = tcx.hir.get_inlined_body(def_id) {
437 self.dep_graph.read(DepNode::MetaData(def_id));
438 debug!("item_body({}): inlining item", tcx.item_path_str(def_id));
440 self.get_crate_data(def_id.krate).item_body(tcx, def_id.index)
443 fn item_body_nested_bodies(&self, def: DefId) -> BTreeMap<hir::BodyId, hir::Body> {
444 self.dep_graph.read(DepNode::MetaData(def));
445 self.get_crate_data(def.krate).item_body_nested_bodies(def.index)
448 fn const_is_rvalue_promotable_to_static(&self, def: DefId) -> bool {
449 self.dep_graph.read(DepNode::MetaData(def));
450 self.get_crate_data(def.krate).const_is_rvalue_promotable_to_static(def.index)
453 fn is_item_mir_available(&self, def: DefId) -> bool {
454 self.dep_graph.read(DepNode::MetaData(def));
455 self.get_crate_data(def.krate).is_item_mir_available(def.index)
458 fn crates(&self) -> Vec<CrateNum>
460 let mut result = vec![];
461 self.iter_crate_data(|cnum, _| result.push(cnum));
465 fn used_libraries(&self) -> Vec<NativeLibrary>
467 self.get_used_libraries().borrow().clone()
470 fn used_link_args(&self) -> Vec<String>
472 self.get_used_link_args().borrow().clone()
475 fn metadata_filename(&self) -> &str
477 locator::METADATA_FILENAME
480 fn metadata_section_name(&self, target: &Target) -> &str
482 locator::meta_section_name(target)
485 fn used_crates(&self, prefer: LinkagePreference) -> Vec<(CrateNum, LibSource)>
487 self.do_get_used_crates(prefer)
490 fn used_crate_source(&self, cnum: CrateNum) -> CrateSource
492 self.get_crate_data(cnum).source.clone()
495 fn extern_mod_stmt_cnum(&self, emod_id: ast::NodeId) -> Option<CrateNum>
497 self.do_extern_mod_stmt_cnum(emod_id)
500 fn encode_metadata<'a, 'tcx>(&self,
501 tcx: TyCtxt<'a, 'tcx, 'tcx>,
502 link_meta: &LinkMeta,
506 encoder::encode_metadata(tcx, self, link_meta, reachable)
509 fn metadata_encoding_version(&self) -> &[u8]
511 schema::METADATA_HEADER
514 /// Returns a map from a sufficiently visible external item (i.e. an external item that is
515 /// visible from at least one local module) to a sufficiently visible parent (considering
516 /// modules that re-export the external item to be parents).
517 fn visible_parent_map<'a>(&'a self) -> ::std::cell::Ref<'a, DefIdMap<DefId>> {
519 let visible_parent_map = self.visible_parent_map.borrow();
520 if !visible_parent_map.is_empty() {
521 return visible_parent_map;
525 use std::collections::vec_deque::VecDeque;
526 use std::collections::hash_map::Entry;
528 let mut visible_parent_map = self.visible_parent_map.borrow_mut();
530 for cnum in (1 .. self.next_crate_num().as_usize()).map(CrateNum::new) {
531 let cdata = self.get_crate_data(cnum);
533 match cdata.extern_crate.get() {
534 // Ignore crates without a corresponding local `extern crate` item.
535 Some(extern_crate) if !extern_crate.direct => continue,
539 let mut bfs_queue = &mut VecDeque::new();
540 let mut add_child = |bfs_queue: &mut VecDeque<_>, child: def::Export, parent: DefId| {
541 let child = child.def.def_id();
543 if self.visibility(child) != ty::Visibility::Public {
547 match visible_parent_map.entry(child) {
548 Entry::Occupied(mut entry) => {
549 // If `child` is defined in crate `cnum`, ensure
550 // that it is mapped to a parent in `cnum`.
551 if child.krate == cnum && entry.get().krate != cnum {
552 entry.insert(parent);
555 Entry::Vacant(entry) => {
556 entry.insert(parent);
557 bfs_queue.push_back(child);
562 bfs_queue.push_back(DefId {
564 index: CRATE_DEF_INDEX
566 while let Some(def) = bfs_queue.pop_front() {
567 for child in self.item_children(def) {
568 add_child(bfs_queue, child, def);
573 drop(visible_parent_map);
574 self.visible_parent_map.borrow()