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.
11 use cstore::{self, LoadedMacro};
18 use rustc::ty::query::QueryConfig;
19 use rustc::middle::cstore::{CrateStore, DepKind,
20 EncodedMetadata, NativeLibraryKind};
21 use rustc::middle::exported_symbols::ExportedSymbol;
22 use rustc::middle::stability::DeprecationEntry;
24 use rustc::session::{CrateDisambiguator, Session};
25 use rustc::ty::{self, TyCtxt};
26 use rustc::ty::query::Providers;
27 use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE, CRATE_DEF_INDEX};
28 use rustc::hir::map::{DefKey, DefPath, DefPathHash};
29 use rustc::hir::map::definitions::DefPathTable;
30 use rustc::util::nodemap::DefIdMap;
31 use rustc_data_structures::svh::Svh;
34 use rustc_data_structures::sync::Lrc;
39 use syntax::source_map;
40 use syntax::edition::Edition;
41 use syntax::parse::source_file_to_stream;
42 use syntax::symbol::Symbol;
43 use syntax_pos::{Span, NO_EXPANSION, FileName};
44 use rustc_data_structures::bit_set::BitSet;
46 macro_rules! provide {
47 (<$lt:tt> $tcx:ident, $def_id:ident, $other:ident, $cdata:ident,
48 $($name:ident => $compute:block)*) => {
49 pub fn provide_extern<$lt>(providers: &mut Providers<$lt>) {
50 $(fn $name<'a, $lt:$lt, T>($tcx: TyCtxt<'a, $lt, $lt>, def_id_arg: T)
51 -> <ty::queries::$name<$lt> as
52 QueryConfig<$lt>>::Value
55 #[allow(unused_variables)]
56 let ($def_id, $other) = def_id_arg.into_args();
57 assert!(!$def_id.is_local());
59 let def_path_hash = $tcx.def_path_hash(DefId {
61 index: CRATE_DEF_INDEX
63 let dep_node = def_path_hash
64 .to_dep_node(::rustc::dep_graph::DepKind::CrateMetadata);
65 // The DepNodeIndex of the DepNode::CrateMetadata should be
66 // cached somewhere, so that we can use read_index().
67 $tcx.dep_graph.read(dep_node);
69 let $cdata = $tcx.crate_data_as_rc_any($def_id.krate);
70 let $cdata = $cdata.downcast_ref::<cstore::CrateMetadata>()
71 .expect("CrateStore created data is not a CrateMetadata");
75 *providers = Providers {
83 // small trait to work around different signature queries all being defined via
86 fn into_args(self) -> (DefId, DefId);
89 impl IntoArgs for DefId {
90 fn into_args(self) -> (DefId, DefId) { (self, self) }
93 impl IntoArgs for CrateNum {
94 fn into_args(self) -> (DefId, DefId) { (self.as_def_id(), self.as_def_id()) }
97 impl IntoArgs for (CrateNum, DefId) {
98 fn into_args(self) -> (DefId, DefId) { (self.0.as_def_id(), self.1) }
101 provide! { <'tcx> tcx, def_id, other, cdata,
102 type_of => { cdata.get_type(def_id.index, tcx) }
104 tcx.alloc_generics(cdata.get_generics(def_id.index, tcx.sess))
106 predicates_of => { Lrc::new(cdata.get_predicates(def_id.index, tcx)) }
107 predicates_defined_on => { Lrc::new(cdata.get_predicates_defined_on(def_id.index, tcx)) }
108 super_predicates_of => { Lrc::new(cdata.get_super_predicates(def_id.index, tcx)) }
110 tcx.alloc_trait_def(cdata.get_trait_def(def_id.index, tcx.sess))
112 adt_def => { cdata.get_adt_def(def_id.index, tcx) }
115 tcx.calculate_dtor(def_id, &mut |_,_| Ok(()))
117 variances_of => { Lrc::new(cdata.get_item_variances(def_id.index)) }
118 associated_item_def_ids => {
119 let mut result = vec![];
120 cdata.each_child_of_item(def_id.index,
121 |child| result.push(child.def.def_id()), tcx.sess);
124 associated_item => { cdata.get_associated_item(def_id.index) }
125 impl_trait_ref => { cdata.get_impl_trait(def_id.index, tcx) }
126 impl_polarity => { cdata.get_impl_polarity(def_id.index) }
127 coerce_unsized_info => {
128 cdata.get_coerce_unsized_info(def_id.index).unwrap_or_else(|| {
129 bug!("coerce_unsized_info: `{:?}` is missing its info", def_id);
133 let mir = cdata.maybe_get_optimized_mir(tcx, def_id.index).unwrap_or_else(|| {
134 bug!("get_optimized_mir: missing MIR for `{:?}`", def_id)
137 let mir = tcx.alloc_mir(mir);
141 mir_const_qualif => {
142 (cdata.mir_const_qualif(def_id.index), Lrc::new(BitSet::new_empty(0)))
144 fn_sig => { cdata.fn_sig(def_id.index, tcx) }
145 inherent_impls => { Lrc::new(cdata.get_inherent_implementations_for_type(def_id.index)) }
146 is_const_fn_raw => { cdata.is_const_fn_raw(def_id.index) }
147 is_foreign_item => { cdata.is_foreign_item(def_id.index) }
148 describe_def => { cdata.get_def(def_id.index) }
149 def_span => { cdata.get_span(def_id.index, &tcx.sess) }
150 lookup_stability => {
151 cdata.get_stability(def_id.index).map(|s| tcx.intern_stability(s))
153 lookup_deprecation_entry => {
154 cdata.get_deprecation(def_id.index).map(DeprecationEntry::external)
156 item_attrs => { cdata.get_item_attrs(def_id.index, tcx.sess) }
157 // FIXME(#38501) We've skipped a `read` on the `HirBody` of
158 // a `fn` when encoding, so the dep-tracking wouldn't work.
159 // This is only used by rustdoc anyway, which shouldn't have
160 // incremental recompilation ever enabled.
161 fn_arg_names => { cdata.get_fn_arg_names(def_id.index) }
162 rendered_const => { cdata.get_rendered_const(def_id.index) }
163 impl_parent => { cdata.get_parent_impl(def_id.index) }
164 trait_of_item => { cdata.get_trait_of_item(def_id.index) }
165 const_is_rvalue_promotable_to_static => {
166 cdata.const_is_rvalue_promotable_to_static(def_id.index)
168 is_mir_available => { cdata.is_item_mir_available(def_id.index) }
170 dylib_dependency_formats => { Lrc::new(cdata.get_dylib_dependency_formats()) }
171 is_panic_runtime => { cdata.root.panic_runtime }
172 is_compiler_builtins => { cdata.root.compiler_builtins }
173 has_global_allocator => { cdata.root.has_global_allocator }
174 has_panic_handler => { cdata.root.has_panic_handler }
175 is_sanitizer_runtime => { cdata.root.sanitizer_runtime }
176 is_profiler_runtime => { cdata.root.profiler_runtime }
177 panic_strategy => { cdata.root.panic_strategy }
179 let r = Lrc::new(*cdata.extern_crate.lock());
182 is_no_builtins => { cdata.root.no_builtins }
183 impl_defaultness => { cdata.get_impl_defaultness(def_id.index) }
184 reachable_non_generics => {
185 let reachable_non_generics = tcx
186 .exported_symbols(cdata.cnum)
188 .filter_map(|&(exported_symbol, export_level)| {
189 if let ExportedSymbol::NonGeneric(def_id) = exported_symbol {
190 return Some((def_id, export_level))
197 Lrc::new(reachable_non_generics)
199 native_libraries => { Lrc::new(cdata.get_native_libraries(tcx.sess)) }
200 foreign_modules => { Lrc::new(cdata.get_foreign_modules(tcx.sess)) }
201 plugin_registrar_fn => {
202 cdata.root.plugin_registrar_fn.map(|index| {
203 DefId { krate: def_id.krate, index }
206 proc_macro_decls_static => {
207 cdata.root.proc_macro_decls_static.map(|index| {
208 DefId { krate: def_id.krate, index }
211 crate_disambiguator => { cdata.root.disambiguator }
212 crate_hash => { cdata.root.hash }
213 original_crate_name => { cdata.root.name }
215 extra_filename => { cdata.root.extra_filename.clone() }
218 implementations_of_trait => {
219 let mut result = vec![];
220 let filter = Some(other);
221 cdata.get_implementations_for_trait(filter, &mut result);
225 all_trait_implementations => {
226 let mut result = vec![];
227 cdata.get_implementations_for_trait(None, &mut result);
231 visibility => { cdata.get_visibility(def_id.index) }
233 let r = *cdata.dep_kind.lock();
236 crate_name => { cdata.name }
238 let mut result = vec![];
239 cdata.each_child_of_item(def_id.index, |child| result.push(child), tcx.sess);
242 defined_lib_features => { Lrc::new(cdata.get_lib_features()) }
243 defined_lang_items => { Lrc::new(cdata.get_lang_items()) }
244 missing_lang_items => { Lrc::new(cdata.get_missing_lang_items()) }
246 missing_extern_crate_item => {
247 let r = match *cdata.extern_crate.borrow() {
248 Some(extern_crate) if !extern_crate.direct => true,
254 used_crate_source => { Lrc::new(cdata.source.clone()) }
256 exported_symbols => {
257 let cnum = cdata.cnum;
258 assert!(cnum != LOCAL_CRATE);
260 Arc::new(cdata.exported_symbols(tcx))
264 pub fn provide<'tcx>(providers: &mut Providers<'tcx>) {
265 // FIXME(#44234) - almost all of these queries have no sub-queries and
266 // therefore no actual inputs, they're just reading tables calculated in
267 // resolve! Does this work? Unsure! That's what the issue is about
268 *providers = Providers {
269 is_dllimport_foreign_item: |tcx, id| {
270 tcx.native_library_kind(id) == Some(NativeLibraryKind::NativeUnknown)
272 is_statically_included_foreign_item: |tcx, id| {
273 match tcx.native_library_kind(id) {
274 Some(NativeLibraryKind::NativeStatic) |
275 Some(NativeLibraryKind::NativeStaticNobundle) => true,
279 native_library_kind: |tcx, id| {
280 tcx.native_libraries(id.krate)
282 .filter(|lib| native_libs::relevant_lib(&tcx.sess, lib))
284 let fm_id = match lib.foreign_module {
286 None => return false,
288 tcx.foreign_modules(id.krate)
290 .find(|m| m.def_id == fm_id)
291 .expect("failed to find foreign module")
297 native_libraries: |tcx, cnum| {
298 assert_eq!(cnum, LOCAL_CRATE);
299 Lrc::new(native_libs::collect(tcx))
301 foreign_modules: |tcx, cnum| {
302 assert_eq!(cnum, LOCAL_CRATE);
303 Lrc::new(foreign_modules::collect(tcx))
305 link_args: |tcx, cnum| {
306 assert_eq!(cnum, LOCAL_CRATE);
307 Lrc::new(link_args::collect(tcx))
310 // Returns a map from a sufficiently visible external item (i.e. an
311 // external item that is visible from at least one local module) to a
312 // sufficiently visible parent (considering modules that re-export the
313 // external item to be parents).
314 visible_parent_map: |tcx, cnum| {
315 use std::collections::vec_deque::VecDeque;
316 use std::collections::hash_map::Entry;
318 assert_eq!(cnum, LOCAL_CRATE);
319 let mut visible_parent_map: DefIdMap<DefId> = Default::default();
321 // Issue 46112: We want the map to prefer the shortest
322 // paths when reporting the path to an item. Therefore we
323 // build up the map via a breadth-first search (BFS),
324 // which naturally yields minimal-length paths.
326 // Note that it needs to be a BFS over the whole forest of
327 // crates, not just each individual crate; otherwise you
328 // only get paths that are locally minimal with respect to
329 // whatever crate we happened to encounter first in this
330 // traversal, but not globally minimal across all crates.
331 let bfs_queue = &mut VecDeque::new();
333 // Preferring shortest paths alone does not guarantee a
334 // deterministic result; so sort by crate num to avoid
335 // hashtable iteration non-determinism. This only makes
336 // things as deterministic as crate-nums assignment is,
337 // which is to say, its not deterministic in general. But
338 // we believe that libstd is consistently assigned crate
339 // num 1, so it should be enough to resolve #46112.
340 let mut crates: Vec<CrateNum> = (*tcx.crates()).clone();
343 for &cnum in crates.iter() {
344 // Ignore crates without a corresponding local `extern crate` item.
345 if tcx.missing_extern_crate_item(cnum) {
349 bfs_queue.push_back(DefId {
351 index: CRATE_DEF_INDEX
355 // (restrict scope of mutable-borrow of `visible_parent_map`)
357 let visible_parent_map = &mut visible_parent_map;
358 let mut add_child = |bfs_queue: &mut VecDeque<_>,
361 if child.vis != ty::Visibility::Public {
365 let child = child.def.def_id();
367 match visible_parent_map.entry(child) {
368 Entry::Occupied(mut entry) => {
369 // If `child` is defined in crate `cnum`, ensure
370 // that it is mapped to a parent in `cnum`.
371 if child.krate == cnum && entry.get().krate != cnum {
372 entry.insert(parent);
375 Entry::Vacant(entry) => {
376 entry.insert(parent);
377 bfs_queue.push_back(child);
382 while let Some(def) = bfs_queue.pop_front() {
383 for child in tcx.item_children(def).iter() {
384 add_child(bfs_queue, child, def);
389 Lrc::new(visible_parent_map)
396 impl cstore::CStore {
397 pub fn export_macros_untracked(&self, cnum: CrateNum) {
398 let data = self.get_crate_data(cnum);
399 let mut dep_kind = data.dep_kind.lock();
400 if *dep_kind == DepKind::UnexportedMacrosOnly {
401 *dep_kind = DepKind::MacrosOnly;
405 pub fn dep_kind_untracked(&self, cnum: CrateNum) -> DepKind {
406 let data = self.get_crate_data(cnum);
407 let r = *data.dep_kind.lock();
411 pub fn crate_edition_untracked(&self, cnum: CrateNum) -> Edition {
412 self.get_crate_data(cnum).root.edition
415 pub fn struct_field_names_untracked(&self, def: DefId) -> Vec<ast::Name> {
416 self.get_crate_data(def.krate).get_struct_field_names(def.index)
419 pub fn item_children_untracked(&self, def_id: DefId, sess: &Session) -> Vec<def::Export> {
420 let mut result = vec![];
421 self.get_crate_data(def_id.krate)
422 .each_child_of_item(def_id.index, |child| result.push(child), sess);
426 pub fn load_macro_untracked(&self, id: DefId, sess: &Session) -> LoadedMacro {
427 let data = self.get_crate_data(id.krate);
428 if let Some(ref proc_macros) = data.proc_macros {
429 return LoadedMacro::ProcMacro(proc_macros[id.index.to_proc_macro_index()].1.clone());
430 } else if data.name == "proc_macro" && data.item_name(id.index) == "quote" {
431 use syntax::ext::base::SyntaxExtension;
432 use syntax_ext::proc_macro_impl::BangProcMacro;
434 let client = ::proc_macro::bridge::client::Client::expand1(::proc_macro::quote);
435 let ext = SyntaxExtension::ProcMacro {
436 expander: Box::new(BangProcMacro { client }),
437 allow_internal_unstable: true,
438 edition: data.root.edition,
440 return LoadedMacro::ProcMacro(Lrc::new(ext));
443 let def = data.get_macro(id.index);
444 let macro_full_name = data.def_path(id.index).to_string_friendly(|_| data.imported_name);
445 let source_name = FileName::Macros(macro_full_name);
447 let source_file = sess.parse_sess.source_map().new_source_file(source_name, def.body);
448 let local_span = Span::new(source_file.start_pos, source_file.end_pos, NO_EXPANSION);
449 let body = source_file_to_stream(&sess.parse_sess, source_file, None);
451 // Mark the attrs as used
452 let attrs = data.get_item_attrs(id.index, sess);
453 for attr in attrs.iter() {
454 attr::mark_used(attr);
457 let name = data.def_key(id.index).disambiguated_data.data
458 .get_opt_name().expect("no name in load_macro");
459 sess.imported_macro_spans.borrow_mut()
460 .insert(local_span, (name.to_string(), data.get_span(id.index, sess)));
462 LoadedMacro::MacroDef(ast::Item {
463 ident: ast::Ident::from_str(&name.as_str()),
464 id: ast::DUMMY_NODE_ID,
466 attrs: attrs.iter().cloned().collect(),
467 node: ast::ItemKind::MacroDef(ast::MacroDef {
471 vis: source_map::respan(local_span.shrink_to_lo(), ast::VisibilityKind::Inherited),
476 pub fn associated_item_cloned_untracked(&self, def: DefId) -> ty::AssociatedItem {
477 self.get_crate_data(def.krate).get_associated_item(def.index)
481 impl CrateStore for cstore::CStore {
482 fn crate_data_as_rc_any(&self, krate: CrateNum) -> Lrc<dyn Any> {
483 self.get_crate_data(krate)
486 fn item_generics_cloned_untracked(&self, def: DefId, sess: &Session) -> ty::Generics {
487 self.get_crate_data(def.krate).get_generics(def.index, sess)
490 fn crate_name_untracked(&self, cnum: CrateNum) -> Symbol
492 self.get_crate_data(cnum).name
495 fn crate_disambiguator_untracked(&self, cnum: CrateNum) -> CrateDisambiguator
497 self.get_crate_data(cnum).root.disambiguator
500 fn crate_hash_untracked(&self, cnum: CrateNum) -> Svh
502 self.get_crate_data(cnum).root.hash
505 /// Returns the `DefKey` for a given `DefId`. This indicates the
506 /// parent `DefId` as well as some idea of what kind of data the
507 /// `DefId` refers to.
508 fn def_key(&self, def: DefId) -> DefKey {
509 // Note: loading the def-key (or def-path) for a def-id is not
510 // a *read* of its metadata. This is because the def-id is
511 // really just an interned shorthand for a def-path, which is the
512 // canonical name for an item.
514 // self.dep_graph.read(DepNode::MetaData(def));
515 self.get_crate_data(def.krate).def_key(def.index)
518 fn def_path(&self, def: DefId) -> DefPath {
519 // See `Note` above in `def_key()` for why this read is
522 // self.dep_graph.read(DepNode::MetaData(def));
523 self.get_crate_data(def.krate).def_path(def.index)
526 fn def_path_hash(&self, def: DefId) -> DefPathHash {
527 self.get_crate_data(def.krate).def_path_hash(def.index)
530 fn def_path_table(&self, cnum: CrateNum) -> Lrc<DefPathTable> {
531 self.get_crate_data(cnum).def_path_table.clone()
534 fn crates_untracked(&self) -> Vec<CrateNum>
536 let mut result = vec![];
537 self.iter_crate_data(|cnum, _| result.push(cnum));
541 fn extern_mod_stmt_cnum_untracked(&self, emod_id: ast::NodeId) -> Option<CrateNum>
543 self.do_extern_mod_stmt_cnum(emod_id)
546 fn postorder_cnums_untracked(&self) -> Vec<CrateNum> {
547 self.do_postorder_cnums_untracked()
550 fn encode_metadata<'a, 'tcx>(&self,
551 tcx: TyCtxt<'a, 'tcx, 'tcx>)
554 encoder::encode_metadata(tcx)
557 fn metadata_encoding_version(&self) -> &[u8]
559 schema::METADATA_HEADER