1 // Copyright 2012-2015 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 //! type context book-keeping
13 use dep_graph::DepGraph;
14 use dep_graph::{DepNode, DepConstructor};
15 use errors::DiagnosticBuilder;
17 use session::config::{BorrowckMode, OutputFilenames, OptLevel};
18 use session::config::CrateType::*;
20 use hir::{TraitCandidate, HirId, ItemLocalId};
21 use hir::def::{Def, Export};
22 use hir::def_id::{CrateNum, DefId, DefIndex, LOCAL_CRATE};
23 use hir::map as hir_map;
24 use hir::map::DefPathHash;
25 use lint::{self, Lint};
26 use ich::{StableHashingContext, NodeIdHashingMode};
27 use infer::canonical::{CanonicalVarInfo, CanonicalVarInfos};
28 use infer::outlives::free_region_map::FreeRegionMap;
29 use middle::const_val::ConstVal;
30 use middle::cstore::{CrateStore, LinkMeta};
31 use middle::cstore::EncodedMetadata;
32 use middle::lang_items;
33 use middle::resolve_lifetime::{self, ObjectLifetimeDefault};
34 use middle::stability;
35 use mir::{self, Mir, interpret};
36 use mir::interpret::{Value, PrimVal};
37 use ty::subst::{Kind, Substs};
41 use traits::{Clause, Clauses, Goal, Goals};
42 use ty::{self, Ty, TypeAndMut};
43 use ty::{TyS, TypeVariants, Slice};
44 use ty::{AdtKind, AdtDef, ClosureSubsts, GeneratorInterior, Region, Const};
45 use ty::{PolyFnSig, InferTy, ParamTy, ProjectionTy, ExistentialPredicate, Predicate};
47 use ty::{TyVar, TyVid, IntVar, IntVid, FloatVar, FloatVid};
48 use ty::TypeVariants::*;
49 use ty::layout::{LayoutDetails, TargetDataLayout};
54 use util::nodemap::{DefIdSet, ItemLocalMap};
55 use util::nodemap::{FxHashMap, FxHashSet};
56 use rustc_data_structures::accumulate_vec::AccumulateVec;
57 use rustc_data_structures::stable_hasher::{HashStable, hash_stable_hashmap,
58 StableHasher, StableHasherResult,
60 use arena::{TypedArena, SyncDroplessArena};
61 use rustc_data_structures::indexed_vec::IndexVec;
62 use rustc_data_structures::sync::{Lrc, Lock};
64 use std::borrow::Borrow;
65 use std::cmp::Ordering;
66 use std::collections::hash_map::{self, Entry};
67 use std::hash::{Hash, Hasher};
73 use rustc_target::spec::abi;
74 use syntax::ast::{self, NodeId};
76 use syntax::codemap::MultiSpan;
77 use syntax::feature_gate;
78 use syntax::symbol::{Symbol, keywords, InternedString};
83 pub struct AllArenas<'tcx> {
84 pub global: GlobalArenas<'tcx>,
85 pub interner: SyncDroplessArena,
88 impl<'tcx> AllArenas<'tcx> {
89 pub fn new() -> Self {
91 global: GlobalArenas::new(),
92 interner: SyncDroplessArena::new(),
98 pub struct GlobalArenas<'tcx> {
100 layout: TypedArena<LayoutDetails>,
103 generics: TypedArena<ty::Generics>,
104 trait_def: TypedArena<ty::TraitDef>,
105 adt_def: TypedArena<ty::AdtDef>,
106 steal_mir: TypedArena<Steal<Mir<'tcx>>>,
107 mir: TypedArena<Mir<'tcx>>,
108 tables: TypedArena<ty::TypeckTables<'tcx>>,
110 const_allocs: TypedArena<interpret::Allocation>,
113 impl<'tcx> GlobalArenas<'tcx> {
114 pub fn new() -> GlobalArenas<'tcx> {
116 layout: TypedArena::new(),
117 generics: TypedArena::new(),
118 trait_def: TypedArena::new(),
119 adt_def: TypedArena::new(),
120 steal_mir: TypedArena::new(),
121 mir: TypedArena::new(),
122 tables: TypedArena::new(),
123 const_allocs: TypedArena::new(),
128 type InternedSet<'tcx, T> = Lock<FxHashSet<Interned<'tcx, T>>>;
130 pub struct CtxtInterners<'tcx> {
131 /// The arena that types, regions, etc are allocated from
132 arena: &'tcx SyncDroplessArena,
134 /// Specifically use a speedy hash algorithm for these hash sets,
135 /// they're accessed quite often.
136 type_: InternedSet<'tcx, TyS<'tcx>>,
137 type_list: InternedSet<'tcx, Slice<Ty<'tcx>>>,
138 substs: InternedSet<'tcx, Substs<'tcx>>,
139 canonical_var_infos: InternedSet<'tcx, Slice<CanonicalVarInfo>>,
140 region: InternedSet<'tcx, RegionKind>,
141 existential_predicates: InternedSet<'tcx, Slice<ExistentialPredicate<'tcx>>>,
142 predicates: InternedSet<'tcx, Slice<Predicate<'tcx>>>,
143 const_: InternedSet<'tcx, Const<'tcx>>,
144 clauses: InternedSet<'tcx, Slice<Clause<'tcx>>>,
145 goals: InternedSet<'tcx, Slice<Goal<'tcx>>>,
148 impl<'gcx: 'tcx, 'tcx> CtxtInterners<'tcx> {
149 fn new(arena: &'tcx SyncDroplessArena) -> CtxtInterners<'tcx> {
152 type_: Default::default(),
153 type_list: Default::default(),
154 substs: Default::default(),
155 region: Default::default(),
156 existential_predicates: Default::default(),
157 canonical_var_infos: Default::default(),
158 predicates: Default::default(),
159 const_: Default::default(),
160 clauses: Default::default(),
161 goals: Default::default(),
165 /// Intern a type. global_interners is Some only if this is
166 /// a local interner and global_interners is its counterpart.
167 fn intern_ty(&self, st: TypeVariants<'tcx>,
168 global_interners: Option<&CtxtInterners<'gcx>>)
171 let mut interner = self.type_.borrow_mut();
172 if let Some(&Interned(ty)) = interner.get(&st) {
175 let global_interner = global_interners.map(|interners| {
176 (interners.type_.borrow_mut(), &interners.arena)
178 if let Some((ref type_, _)) = global_interner {
179 if let Some(&Interned(ty)) = type_.get(&st) {
184 let flags = super::flags::FlagComputation::for_sty(&st);
185 let ty_struct = TyS {
188 region_depth: flags.depth,
191 // HACK(eddyb) Depend on flags being accurate to
192 // determine that all contents are in the global tcx.
193 // See comments on Lift for why we can't use that.
194 if !flags.flags.intersects(ty::TypeFlags::KEEP_IN_LOCAL_TCX) {
195 if let Some((mut type_, arena)) = global_interner {
196 let ty_struct: TyS<'gcx> = unsafe {
197 mem::transmute(ty_struct)
199 let ty: Ty<'gcx> = arena.alloc(ty_struct);
200 type_.insert(Interned(ty));
204 // Make sure we don't end up with inference
205 // types/regions in the global tcx.
206 if global_interner.is_none() {
208 bug!("Attempted to intern `{:?}` which contains \
209 inference types/regions in the global type context",
214 // Don't be &mut TyS.
215 let ty: Ty<'tcx> = self.arena.alloc(ty_struct);
216 interner.insert(Interned(ty));
220 debug!("Interned type: {:?} Pointer: {:?}",
221 ty, ty as *const TyS);
227 pub struct CommonTypes<'tcx> {
247 pub re_empty: Region<'tcx>,
248 pub re_static: Region<'tcx>,
249 pub re_erased: Region<'tcx>,
252 pub struct LocalTableInContext<'a, V: 'a> {
253 local_id_root: Option<DefId>,
254 data: &'a ItemLocalMap<V>
257 /// Validate that the given HirId (respectively its `local_id` part) can be
258 /// safely used as a key in the tables of a TypeckTable. For that to be
259 /// the case, the HirId must have the same `owner` as all the other IDs in
260 /// this table (signified by `local_id_root`). Otherwise the HirId
261 /// would be in a different frame of reference and using its `local_id`
262 /// would result in lookup errors, or worse, in silently wrong data being
264 fn validate_hir_id_for_typeck_tables(local_id_root: Option<DefId>,
267 if cfg!(debug_assertions) {
268 if let Some(local_id_root) = local_id_root {
269 if hir_id.owner != local_id_root.index {
270 ty::tls::with(|tcx| {
271 let node_id = tcx.hir
273 .find_node_for_hir_id(hir_id);
275 bug!("node {} with HirId::owner {:?} cannot be placed in \
276 TypeckTables with local_id_root {:?}",
277 tcx.hir.node_to_string(node_id),
278 DefId::local(hir_id.owner),
283 // We use "Null Object" TypeckTables in some of the analysis passes.
284 // These are just expected to be empty and their `local_id_root` is
285 // `None`. Therefore we cannot verify whether a given `HirId` would
286 // be a valid key for the given table. Instead we make sure that
287 // nobody tries to write to such a Null Object table.
289 bug!("access to invalid TypeckTables")
295 impl<'a, V> LocalTableInContext<'a, V> {
296 pub fn contains_key(&self, id: hir::HirId) -> bool {
297 validate_hir_id_for_typeck_tables(self.local_id_root, id, false);
298 self.data.contains_key(&id.local_id)
301 pub fn get(&self, id: hir::HirId) -> Option<&V> {
302 validate_hir_id_for_typeck_tables(self.local_id_root, id, false);
303 self.data.get(&id.local_id)
306 pub fn iter(&self) -> hash_map::Iter<hir::ItemLocalId, V> {
311 impl<'a, V> ::std::ops::Index<hir::HirId> for LocalTableInContext<'a, V> {
314 fn index(&self, key: hir::HirId) -> &V {
315 self.get(key).expect("LocalTableInContext: key not found")
319 pub struct LocalTableInContextMut<'a, V: 'a> {
320 local_id_root: Option<DefId>,
321 data: &'a mut ItemLocalMap<V>
324 impl<'a, V> LocalTableInContextMut<'a, V> {
325 pub fn get_mut(&mut self, id: hir::HirId) -> Option<&mut V> {
326 validate_hir_id_for_typeck_tables(self.local_id_root, id, true);
327 self.data.get_mut(&id.local_id)
330 pub fn entry(&mut self, id: hir::HirId) -> Entry<hir::ItemLocalId, V> {
331 validate_hir_id_for_typeck_tables(self.local_id_root, id, true);
332 self.data.entry(id.local_id)
335 pub fn insert(&mut self, id: hir::HirId, val: V) -> Option<V> {
336 validate_hir_id_for_typeck_tables(self.local_id_root, id, true);
337 self.data.insert(id.local_id, val)
340 pub fn remove(&mut self, id: hir::HirId) -> Option<V> {
341 validate_hir_id_for_typeck_tables(self.local_id_root, id, true);
342 self.data.remove(&id.local_id)
346 #[derive(RustcEncodable, RustcDecodable, Debug)]
347 pub struct TypeckTables<'tcx> {
348 /// The HirId::owner all ItemLocalIds in this table are relative to.
349 pub local_id_root: Option<DefId>,
351 /// Resolved definitions for `<T>::X` associated paths and
352 /// method calls, including those of overloaded operators.
353 type_dependent_defs: ItemLocalMap<Def>,
355 /// Resolved field indices for field accesses in expressions (`S { field }`, `obj.field`)
356 /// or patterns (`S { field }`). The index is often useful by itself, but to learn more
357 /// about the field you also need definition of the variant to which the field
358 /// belongs, but it may not exist if it's a tuple field (`tuple.0`).
359 field_indices: ItemLocalMap<usize>,
361 /// Stores the canonicalized types provided by the user. See also `UserAssertTy` statement in
363 user_provided_tys: ItemLocalMap<CanonicalTy<'tcx>>,
365 /// Stores the types for various nodes in the AST. Note that this table
366 /// is not guaranteed to be populated until after typeck. See
367 /// typeck::check::fn_ctxt for details.
368 node_types: ItemLocalMap<Ty<'tcx>>,
370 /// Stores the type parameters which were substituted to obtain the type
371 /// of this node. This only applies to nodes that refer to entities
372 /// parameterized by type parameters, such as generic fns, types, or
374 node_substs: ItemLocalMap<&'tcx Substs<'tcx>>,
376 adjustments: ItemLocalMap<Vec<ty::adjustment::Adjustment<'tcx>>>,
378 /// Stores the actual binding mode for all instances of hir::BindingAnnotation.
379 pat_binding_modes: ItemLocalMap<BindingMode>,
381 /// Stores the types which were implicitly dereferenced in pattern binding modes
382 /// for later usage in HAIR lowering. For example,
385 /// match &&Some(5i32) {
390 /// leads to a `vec![&&Option<i32>, &Option<i32>]`. Empty vectors are not stored.
393 /// https://github.com/rust-lang/rfcs/blob/master/text/2005-match-ergonomics.md#definitions
394 pat_adjustments: ItemLocalMap<Vec<Ty<'tcx>>>,
397 pub upvar_capture_map: ty::UpvarCaptureMap<'tcx>,
399 /// Records the reasons that we picked the kind of each closure;
400 /// not all closures are present in the map.
401 closure_kind_origins: ItemLocalMap<(Span, ast::Name)>,
403 /// For each fn, records the "liberated" types of its arguments
404 /// and return type. Liberated means that all bound regions
405 /// (including late-bound regions) are replaced with free
406 /// equivalents. This table is not used in trans (since regions
407 /// are erased there) and hence is not serialized to metadata.
408 liberated_fn_sigs: ItemLocalMap<ty::FnSig<'tcx>>,
410 /// For each FRU expression, record the normalized types of the fields
411 /// of the struct - this is needed because it is non-trivial to
412 /// normalize while preserving regions. This table is used only in
413 /// MIR construction and hence is not serialized to metadata.
414 fru_field_types: ItemLocalMap<Vec<Ty<'tcx>>>,
416 /// Maps a cast expression to its kind. This is keyed on the
417 /// *from* expression of the cast, not the cast itself.
418 cast_kinds: ItemLocalMap<ty::cast::CastKind>,
420 /// Set of trait imports actually used in the method resolution.
421 /// This is used for warning unused imports. During type
422 /// checking, this `Lrc` should not be cloned: it must have a ref-count
423 /// of 1 so that we can insert things into the set mutably.
424 pub used_trait_imports: Lrc<DefIdSet>,
426 /// If any errors occurred while type-checking this body,
427 /// this field will be set to `true`.
428 pub tainted_by_errors: bool,
430 /// Stores the free-region relationships that were deduced from
431 /// its where clauses and parameter types. These are then
432 /// read-again by borrowck.
433 pub free_region_map: FreeRegionMap<'tcx>,
436 impl<'tcx> TypeckTables<'tcx> {
437 pub fn empty(local_id_root: Option<DefId>) -> TypeckTables<'tcx> {
440 type_dependent_defs: ItemLocalMap(),
441 field_indices: ItemLocalMap(),
442 user_provided_tys: ItemLocalMap(),
443 node_types: ItemLocalMap(),
444 node_substs: ItemLocalMap(),
445 adjustments: ItemLocalMap(),
446 pat_binding_modes: ItemLocalMap(),
447 pat_adjustments: ItemLocalMap(),
448 upvar_capture_map: FxHashMap(),
449 closure_kind_origins: ItemLocalMap(),
450 liberated_fn_sigs: ItemLocalMap(),
451 fru_field_types: ItemLocalMap(),
452 cast_kinds: ItemLocalMap(),
453 used_trait_imports: Lrc::new(DefIdSet()),
454 tainted_by_errors: false,
455 free_region_map: FreeRegionMap::new(),
459 /// Returns the final resolution of a `QPath` in an `Expr` or `Pat` node.
460 pub fn qpath_def(&self, qpath: &hir::QPath, id: hir::HirId) -> Def {
462 hir::QPath::Resolved(_, ref path) => path.def,
463 hir::QPath::TypeRelative(..) => {
464 validate_hir_id_for_typeck_tables(self.local_id_root, id, false);
465 self.type_dependent_defs.get(&id.local_id).cloned().unwrap_or(Def::Err)
470 pub fn type_dependent_defs(&self) -> LocalTableInContext<Def> {
471 LocalTableInContext {
472 local_id_root: self.local_id_root,
473 data: &self.type_dependent_defs
477 pub fn type_dependent_defs_mut(&mut self) -> LocalTableInContextMut<Def> {
478 LocalTableInContextMut {
479 local_id_root: self.local_id_root,
480 data: &mut self.type_dependent_defs
484 pub fn field_indices(&self) -> LocalTableInContext<usize> {
485 LocalTableInContext {
486 local_id_root: self.local_id_root,
487 data: &self.field_indices
491 pub fn field_indices_mut(&mut self) -> LocalTableInContextMut<usize> {
492 LocalTableInContextMut {
493 local_id_root: self.local_id_root,
494 data: &mut self.field_indices
498 pub fn user_provided_tys(&self) -> LocalTableInContext<CanonicalTy<'tcx>> {
499 LocalTableInContext {
500 local_id_root: self.local_id_root,
501 data: &self.user_provided_tys
505 pub fn user_provided_tys_mut(&mut self) -> LocalTableInContextMut<CanonicalTy<'tcx>> {
506 LocalTableInContextMut {
507 local_id_root: self.local_id_root,
508 data: &mut self.user_provided_tys
512 pub fn node_types(&self) -> LocalTableInContext<Ty<'tcx>> {
513 LocalTableInContext {
514 local_id_root: self.local_id_root,
515 data: &self.node_types
519 pub fn node_types_mut(&mut self) -> LocalTableInContextMut<Ty<'tcx>> {
520 LocalTableInContextMut {
521 local_id_root: self.local_id_root,
522 data: &mut self.node_types
526 pub fn node_id_to_type(&self, id: hir::HirId) -> Ty<'tcx> {
527 match self.node_id_to_type_opt(id) {
530 bug!("node_id_to_type: no type for node `{}`",
532 let id = tcx.hir.definitions().find_node_for_hir_id(id);
533 tcx.hir.node_to_string(id)
539 pub fn node_id_to_type_opt(&self, id: hir::HirId) -> Option<Ty<'tcx>> {
540 validate_hir_id_for_typeck_tables(self.local_id_root, id, false);
541 self.node_types.get(&id.local_id).cloned()
544 pub fn node_substs_mut(&mut self) -> LocalTableInContextMut<&'tcx Substs<'tcx>> {
545 LocalTableInContextMut {
546 local_id_root: self.local_id_root,
547 data: &mut self.node_substs
551 pub fn node_substs(&self, id: hir::HirId) -> &'tcx Substs<'tcx> {
552 validate_hir_id_for_typeck_tables(self.local_id_root, id, false);
553 self.node_substs.get(&id.local_id).cloned().unwrap_or(Substs::empty())
556 pub fn node_substs_opt(&self, id: hir::HirId) -> Option<&'tcx Substs<'tcx>> {
557 validate_hir_id_for_typeck_tables(self.local_id_root, id, false);
558 self.node_substs.get(&id.local_id).cloned()
561 // Returns the type of a pattern as a monotype. Like @expr_ty, this function
562 // doesn't provide type parameter substitutions.
563 pub fn pat_ty(&self, pat: &hir::Pat) -> Ty<'tcx> {
564 self.node_id_to_type(pat.hir_id)
567 pub fn pat_ty_opt(&self, pat: &hir::Pat) -> Option<Ty<'tcx>> {
568 self.node_id_to_type_opt(pat.hir_id)
571 // Returns the type of an expression as a monotype.
573 // NB (1): This is the PRE-ADJUSTMENT TYPE for the expression. That is, in
574 // some cases, we insert `Adjustment` annotations such as auto-deref or
575 // auto-ref. The type returned by this function does not consider such
576 // adjustments. See `expr_ty_adjusted()` instead.
578 // NB (2): This type doesn't provide type parameter substitutions; e.g. if you
579 // ask for the type of "id" in "id(3)", it will return "fn(&isize) -> isize"
580 // instead of "fn(ty) -> T with T = isize".
581 pub fn expr_ty(&self, expr: &hir::Expr) -> Ty<'tcx> {
582 self.node_id_to_type(expr.hir_id)
585 pub fn expr_ty_opt(&self, expr: &hir::Expr) -> Option<Ty<'tcx>> {
586 self.node_id_to_type_opt(expr.hir_id)
589 pub fn adjustments(&self) -> LocalTableInContext<Vec<ty::adjustment::Adjustment<'tcx>>> {
590 LocalTableInContext {
591 local_id_root: self.local_id_root,
592 data: &self.adjustments
596 pub fn adjustments_mut(&mut self)
597 -> LocalTableInContextMut<Vec<ty::adjustment::Adjustment<'tcx>>> {
598 LocalTableInContextMut {
599 local_id_root: self.local_id_root,
600 data: &mut self.adjustments
604 pub fn expr_adjustments(&self, expr: &hir::Expr)
605 -> &[ty::adjustment::Adjustment<'tcx>] {
606 validate_hir_id_for_typeck_tables(self.local_id_root, expr.hir_id, false);
607 self.adjustments.get(&expr.hir_id.local_id).map_or(&[], |a| &a[..])
610 /// Returns the type of `expr`, considering any `Adjustment`
611 /// entry recorded for that expression.
612 pub fn expr_ty_adjusted(&self, expr: &hir::Expr) -> Ty<'tcx> {
613 self.expr_adjustments(expr)
615 .map_or_else(|| self.expr_ty(expr), |adj| adj.target)
618 pub fn expr_ty_adjusted_opt(&self, expr: &hir::Expr) -> Option<Ty<'tcx>> {
619 self.expr_adjustments(expr)
621 .map(|adj| adj.target)
622 .or_else(|| self.expr_ty_opt(expr))
625 pub fn is_method_call(&self, expr: &hir::Expr) -> bool {
626 // Only paths and method calls/overloaded operators have
627 // entries in type_dependent_defs, ignore the former here.
628 if let hir::ExprPath(_) = expr.node {
632 match self.type_dependent_defs().get(expr.hir_id) {
633 Some(&Def::Method(_)) => true,
638 pub fn pat_binding_modes(&self) -> LocalTableInContext<BindingMode> {
639 LocalTableInContext {
640 local_id_root: self.local_id_root,
641 data: &self.pat_binding_modes
645 pub fn pat_binding_modes_mut(&mut self)
646 -> LocalTableInContextMut<BindingMode> {
647 LocalTableInContextMut {
648 local_id_root: self.local_id_root,
649 data: &mut self.pat_binding_modes
653 pub fn pat_adjustments(&self) -> LocalTableInContext<Vec<Ty<'tcx>>> {
654 LocalTableInContext {
655 local_id_root: self.local_id_root,
656 data: &self.pat_adjustments,
660 pub fn pat_adjustments_mut(&mut self)
661 -> LocalTableInContextMut<Vec<Ty<'tcx>>> {
662 LocalTableInContextMut {
663 local_id_root: self.local_id_root,
664 data: &mut self.pat_adjustments,
668 pub fn upvar_capture(&self, upvar_id: ty::UpvarId) -> ty::UpvarCapture<'tcx> {
669 self.upvar_capture_map[&upvar_id]
672 pub fn closure_kind_origins(&self) -> LocalTableInContext<(Span, ast::Name)> {
673 LocalTableInContext {
674 local_id_root: self.local_id_root,
675 data: &self.closure_kind_origins
679 pub fn closure_kind_origins_mut(&mut self) -> LocalTableInContextMut<(Span, ast::Name)> {
680 LocalTableInContextMut {
681 local_id_root: self.local_id_root,
682 data: &mut self.closure_kind_origins
686 pub fn liberated_fn_sigs(&self) -> LocalTableInContext<ty::FnSig<'tcx>> {
687 LocalTableInContext {
688 local_id_root: self.local_id_root,
689 data: &self.liberated_fn_sigs
693 pub fn liberated_fn_sigs_mut(&mut self) -> LocalTableInContextMut<ty::FnSig<'tcx>> {
694 LocalTableInContextMut {
695 local_id_root: self.local_id_root,
696 data: &mut self.liberated_fn_sigs
700 pub fn fru_field_types(&self) -> LocalTableInContext<Vec<Ty<'tcx>>> {
701 LocalTableInContext {
702 local_id_root: self.local_id_root,
703 data: &self.fru_field_types
707 pub fn fru_field_types_mut(&mut self) -> LocalTableInContextMut<Vec<Ty<'tcx>>> {
708 LocalTableInContextMut {
709 local_id_root: self.local_id_root,
710 data: &mut self.fru_field_types
714 pub fn cast_kinds(&self) -> LocalTableInContext<ty::cast::CastKind> {
715 LocalTableInContext {
716 local_id_root: self.local_id_root,
717 data: &self.cast_kinds
721 pub fn cast_kinds_mut(&mut self) -> LocalTableInContextMut<ty::cast::CastKind> {
722 LocalTableInContextMut {
723 local_id_root: self.local_id_root,
724 data: &mut self.cast_kinds
729 impl<'a, 'gcx> HashStable<StableHashingContext<'a>> for TypeckTables<'gcx> {
730 fn hash_stable<W: StableHasherResult>(&self,
731 hcx: &mut StableHashingContext<'a>,
732 hasher: &mut StableHasher<W>) {
733 let ty::TypeckTables {
735 ref type_dependent_defs,
737 ref user_provided_tys,
741 ref pat_binding_modes,
743 ref upvar_capture_map,
744 ref closure_kind_origins,
745 ref liberated_fn_sigs,
750 ref used_trait_imports,
755 hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
756 type_dependent_defs.hash_stable(hcx, hasher);
757 field_indices.hash_stable(hcx, hasher);
758 user_provided_tys.hash_stable(hcx, hasher);
759 node_types.hash_stable(hcx, hasher);
760 node_substs.hash_stable(hcx, hasher);
761 adjustments.hash_stable(hcx, hasher);
762 pat_binding_modes.hash_stable(hcx, hasher);
763 pat_adjustments.hash_stable(hcx, hasher);
764 hash_stable_hashmap(hcx, hasher, upvar_capture_map, |up_var_id, hcx| {
771 local_id_root.expect("trying to hash invalid TypeckTables");
773 let var_owner_def_id = DefId {
774 krate: local_id_root.krate,
777 let closure_def_id = DefId {
778 krate: local_id_root.krate,
779 index: closure_expr_id.to_def_id().index,
781 (hcx.def_path_hash(var_owner_def_id),
783 hcx.def_path_hash(closure_def_id))
786 closure_kind_origins.hash_stable(hcx, hasher);
787 liberated_fn_sigs.hash_stable(hcx, hasher);
788 fru_field_types.hash_stable(hcx, hasher);
789 cast_kinds.hash_stable(hcx, hasher);
790 used_trait_imports.hash_stable(hcx, hasher);
791 tainted_by_errors.hash_stable(hcx, hasher);
792 free_region_map.hash_stable(hcx, hasher);
797 impl<'tcx> CommonTypes<'tcx> {
798 fn new(interners: &CtxtInterners<'tcx>) -> CommonTypes<'tcx> {
799 let mk = |sty| interners.intern_ty(sty, None);
800 let mk_region = |r| {
801 if let Some(r) = interners.region.borrow().get(&r) {
804 let r = interners.arena.alloc(r);
805 interners.region.borrow_mut().insert(Interned(r));
813 isize: mk(TyInt(ast::IntTy::Isize)),
814 i8: mk(TyInt(ast::IntTy::I8)),
815 i16: mk(TyInt(ast::IntTy::I16)),
816 i32: mk(TyInt(ast::IntTy::I32)),
817 i64: mk(TyInt(ast::IntTy::I64)),
818 i128: mk(TyInt(ast::IntTy::I128)),
819 usize: mk(TyUint(ast::UintTy::Usize)),
820 u8: mk(TyUint(ast::UintTy::U8)),
821 u16: mk(TyUint(ast::UintTy::U16)),
822 u32: mk(TyUint(ast::UintTy::U32)),
823 u64: mk(TyUint(ast::UintTy::U64)),
824 u128: mk(TyUint(ast::UintTy::U128)),
825 f32: mk(TyFloat(ast::FloatTy::F32)),
826 f64: mk(TyFloat(ast::FloatTy::F64)),
828 re_empty: mk_region(RegionKind::ReEmpty),
829 re_static: mk_region(RegionKind::ReStatic),
830 re_erased: mk_region(RegionKind::ReErased),
835 /// The central data structure of the compiler. It stores references
836 /// to the various **arenas** and also houses the results of the
837 /// various **compiler queries** that have been performed. See the
838 /// [rustc guide] for more details.
840 /// [rustc guide]: https://rust-lang-nursery.github.io/rustc-guide/ty.html
841 #[derive(Copy, Clone)]
842 pub struct TyCtxt<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
843 gcx: &'a GlobalCtxt<'gcx>,
844 interners: &'a CtxtInterners<'tcx>
847 impl<'a, 'gcx, 'tcx> Deref for TyCtxt<'a, 'gcx, 'tcx> {
848 type Target = &'a GlobalCtxt<'gcx>;
849 fn deref(&self) -> &Self::Target {
854 pub struct GlobalCtxt<'tcx> {
855 global_arenas: &'tcx GlobalArenas<'tcx>,
856 global_interners: CtxtInterners<'tcx>,
858 cstore: &'tcx dyn CrateStore,
860 pub sess: &'tcx Session,
862 pub dep_graph: DepGraph,
864 /// This provides access to the incr. comp. on-disk cache for query results.
865 /// Do not access this directly. It is only meant to be used by
866 /// `DepGraph::try_mark_green()` and the query infrastructure in `ty::maps`.
867 pub(crate) on_disk_query_result_cache: maps::OnDiskCache<'tcx>,
869 /// Common types, pre-interned for your convenience.
870 pub types: CommonTypes<'tcx>,
872 /// Map indicating what traits are in scope for places where this
873 /// is relevant; generated by resolve.
874 trait_map: FxHashMap<DefIndex,
875 Lrc<FxHashMap<ItemLocalId,
876 Lrc<StableVec<TraitCandidate>>>>>,
878 /// Export map produced by name resolution.
879 export_map: FxHashMap<DefId, Lrc<Vec<Export>>>,
881 pub hir: hir_map::Map<'tcx>,
883 /// A map from DefPathHash -> DefId. Includes DefIds from the local crate
884 /// as well as all upstream crates. Only populated in incremental mode.
885 pub def_path_hash_to_def_id: Option<FxHashMap<DefPathHash, DefId>>,
887 pub maps: maps::Maps<'tcx>,
889 // Records the free variables refrenced by every closure
890 // expression. Do not track deps for this, just recompute it from
891 // scratch every time.
892 freevars: FxHashMap<DefId, Lrc<Vec<hir::Freevar>>>,
894 maybe_unused_trait_imports: FxHashSet<DefId>,
896 maybe_unused_extern_crates: Vec<(DefId, Span)>,
898 // Internal cache for metadata decoding. No need to track deps on this.
899 pub rcache: Lock<FxHashMap<ty::CReaderCacheKey, Ty<'tcx>>>,
901 /// Caches the results of trait selection. This cache is used
902 /// for things that do not have to do with the parameters in scope.
903 pub selection_cache: traits::SelectionCache<'tcx>,
905 /// Caches the results of trait evaluation. This cache is used
906 /// for things that do not have to do with the parameters in scope.
907 /// Merge this with `selection_cache`?
908 pub evaluation_cache: traits::EvaluationCache<'tcx>,
910 /// The definite name of the current crate after taking into account
911 /// attributes, commandline parameters, etc.
912 pub crate_name: Symbol,
914 /// Data layout specification for the current target.
915 pub data_layout: TargetDataLayout,
917 stability_interner: Lock<FxHashSet<&'tcx attr::Stability>>,
919 pub interpret_interner: InterpretInterner<'tcx>,
921 layout_interner: Lock<FxHashSet<&'tcx LayoutDetails>>,
923 /// A general purpose channel to throw data out the back towards LLVM worker
926 /// This is intended to only get used during the trans phase of the compiler
927 /// when satisfying the query for a particular codegen unit. Internally in
928 /// the query it'll send data along this channel to get processed later.
929 pub tx_to_llvm_workers: Lock<mpsc::Sender<Box<dyn Any + Send>>>,
931 output_filenames: Arc<OutputFilenames>,
934 /// Everything needed to efficiently work with interned allocations
935 #[derive(Debug, Default)]
936 pub struct InterpretInterner<'tcx> {
937 inner: Lock<InterpretInternerInner<'tcx>>,
940 #[derive(Debug, Default)]
941 struct InterpretInternerInner<'tcx> {
942 /// Stores the value of constants (and deduplicates the actual memory)
943 allocs: FxHashSet<&'tcx interpret::Allocation>,
945 /// Allows obtaining function instance handles via a unique identifier
946 functions: FxHashMap<interpret::AllocId, Instance<'tcx>>,
948 /// Inverse map of `interpret_functions`.
949 /// Used so we don't allocate a new pointer every time we need one
950 function_cache: FxHashMap<Instance<'tcx>, interpret::AllocId>,
952 /// Allows obtaining const allocs via a unique identifier
953 alloc_by_id: FxHashMap<interpret::AllocId, &'tcx interpret::Allocation>,
955 /// Allows obtaining static def ids via a unique id
956 statics: FxHashMap<interpret::AllocId, DefId>,
958 /// The AllocId to assign to the next new regular allocation.
959 /// Always incremented, never gets smaller.
960 next_id: interpret::AllocId,
962 /// Inverse map of `statics`
963 /// Used so we don't allocate a new pointer every time we need one
964 static_cache: FxHashMap<DefId, interpret::AllocId>,
966 /// A cache for basic byte allocations keyed by their contents. This is used to deduplicate
967 /// allocations for string and bytestring literals.
968 literal_alloc_cache: FxHashMap<Vec<u8>, interpret::AllocId>,
971 impl<'tcx> InterpretInterner<'tcx> {
972 pub fn create_fn_alloc(&self, instance: Instance<'tcx>) -> interpret::AllocId {
973 if let Some(&alloc_id) = self.inner.borrow().function_cache.get(&instance) {
976 let id = self.reserve();
977 debug!("creating fn ptr: {}", id);
978 let mut inner = self.inner.borrow_mut();
979 inner.functions.insert(id, instance);
980 inner.function_cache.insert(instance, id);
986 id: interpret::AllocId,
987 ) -> Option<Instance<'tcx>> {
988 self.inner.borrow().functions.get(&id).cloned()
993 id: interpret::AllocId,
994 ) -> Option<&'tcx interpret::Allocation> {
995 self.inner.borrow().alloc_by_id.get(&id).cloned()
1001 ) -> interpret::AllocId {
1002 if let Some(alloc_id) = self.inner.borrow().static_cache.get(&static_id).cloned() {
1005 let alloc_id = self.reserve();
1006 let mut inner = self.inner.borrow_mut();
1007 inner.static_cache.insert(static_id, alloc_id);
1008 inner.statics.insert(alloc_id, static_id);
1014 ptr: interpret::AllocId,
1015 ) -> Option<DefId> {
1016 self.inner.borrow().statics.get(&ptr).cloned()
1019 pub fn intern_at_reserved(
1021 id: interpret::AllocId,
1022 alloc: &'tcx interpret::Allocation,
1024 if let Some(old) = self.inner.borrow_mut().alloc_by_id.insert(id, alloc) {
1025 bug!("tried to intern allocation at {}, but was already existing as {:#?}", id, old);
1029 /// obtains a new allocation ID that can be referenced but does not
1030 /// yet have an allocation backing it.
1033 ) -> interpret::AllocId {
1034 let mut inner = self.inner.borrow_mut();
1035 let next = inner.next_id;
1036 inner.next_id.0 = inner.next_id.0
1038 .expect("You overflowed a u64 by incrementing by 1... \
1039 You've just earned yourself a free drink if we ever meet. \
1040 Seriously, how did you do that?!");
1045 impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
1046 /// Get the global TyCtxt.
1048 pub fn global_tcx(self) -> TyCtxt<'a, 'gcx, 'gcx> {
1051 interners: &self.gcx.global_interners,
1055 pub fn alloc_generics(self, generics: ty::Generics) -> &'gcx ty::Generics {
1056 self.global_arenas.generics.alloc(generics)
1059 pub fn alloc_steal_mir(self, mir: Mir<'gcx>) -> &'gcx Steal<Mir<'gcx>> {
1060 self.global_arenas.steal_mir.alloc(Steal::new(mir))
1063 pub fn alloc_mir(self, mir: Mir<'gcx>) -> &'gcx Mir<'gcx> {
1064 self.global_arenas.mir.alloc(mir)
1067 pub fn alloc_tables(self, tables: ty::TypeckTables<'gcx>) -> &'gcx ty::TypeckTables<'gcx> {
1068 self.global_arenas.tables.alloc(tables)
1071 pub fn alloc_trait_def(self, def: ty::TraitDef) -> &'gcx ty::TraitDef {
1072 self.global_arenas.trait_def.alloc(def)
1075 pub fn alloc_adt_def(self,
1078 variants: Vec<ty::VariantDef>,
1080 -> &'gcx ty::AdtDef {
1081 let def = ty::AdtDef::new(self, did, kind, variants, repr);
1082 self.global_arenas.adt_def.alloc(def)
1085 pub fn alloc_byte_array(self, bytes: &[u8]) -> &'gcx [u8] {
1086 if bytes.is_empty() {
1089 self.global_interners.arena.alloc_slice(bytes)
1093 pub fn alloc_const_slice(self, values: &[&'tcx ty::Const<'tcx>])
1094 -> &'tcx [&'tcx ty::Const<'tcx>] {
1095 if values.is_empty() {
1098 self.interners.arena.alloc_slice(values)
1102 pub fn alloc_name_const_slice(self, values: &[(ast::Name, &'tcx ty::Const<'tcx>)])
1103 -> &'tcx [(ast::Name, &'tcx ty::Const<'tcx>)] {
1104 if values.is_empty() {
1107 self.interners.arena.alloc_slice(values)
1111 pub fn intern_const_alloc(
1113 alloc: interpret::Allocation,
1114 ) -> &'gcx interpret::Allocation {
1115 let allocs = &mut self.interpret_interner.inner.borrow_mut().allocs;
1116 if let Some(alloc) = allocs.get(&alloc) {
1120 let interned = self.global_arenas.const_allocs.alloc(alloc);
1121 if let Some(prev) = allocs.replace(interned) {
1122 bug!("Tried to overwrite interned Allocation: {:#?}", prev)
1127 /// Allocates a byte or string literal for `mir::interpret`
1128 pub fn allocate_cached(self, bytes: &[u8]) -> interpret::AllocId {
1129 // check whether we already allocated this literal or a constant with the same memory
1130 if let Some(&alloc_id) = self.interpret_interner.inner.borrow()
1131 .literal_alloc_cache.get(bytes) {
1134 // create an allocation that just contains these bytes
1135 let alloc = interpret::Allocation::from_bytes(bytes);
1136 let alloc = self.intern_const_alloc(alloc);
1138 // the next unique id
1139 let id = self.interpret_interner.reserve();
1140 // make the allocation identifiable
1141 self.interpret_interner.inner.borrow_mut().alloc_by_id.insert(id, alloc);
1142 // cache it for the future
1143 self.interpret_interner.inner.borrow_mut().literal_alloc_cache.insert(bytes.to_owned(), id);
1147 pub fn intern_stability(self, stab: attr::Stability) -> &'gcx attr::Stability {
1148 let mut stability_interner = self.stability_interner.borrow_mut();
1149 if let Some(st) = stability_interner.get(&stab) {
1153 let interned = self.global_interners.arena.alloc(stab);
1154 if let Some(prev) = stability_interner.replace(interned) {
1155 bug!("Tried to overwrite interned Stability: {:?}", prev)
1160 pub fn intern_layout(self, layout: LayoutDetails) -> &'gcx LayoutDetails {
1161 let mut layout_interner = self.layout_interner.borrow_mut();
1162 if let Some(layout) = layout_interner.get(&layout) {
1166 let interned = self.global_arenas.layout.alloc(layout);
1167 if let Some(prev) = layout_interner.replace(interned) {
1168 bug!("Tried to overwrite interned Layout: {:?}", prev)
1173 pub fn lift<T: ?Sized + Lift<'tcx>>(self, value: &T) -> Option<T::Lifted> {
1174 value.lift_to_tcx(self)
1177 /// Like lift, but only tries in the global tcx.
1178 pub fn lift_to_global<T: ?Sized + Lift<'gcx>>(self, value: &T) -> Option<T::Lifted> {
1179 value.lift_to_tcx(self.global_tcx())
1182 /// Returns true if self is the same as self.global_tcx().
1183 fn is_global(self) -> bool {
1184 let local = self.interners as *const _;
1185 let global = &self.global_interners as *const _;
1186 local as usize == global as usize
1189 /// Create a type context and call the closure with a `TyCtxt` reference
1190 /// to the context. The closure enforces that the type context and any interned
1191 /// value (types, substs, etc.) can only be used while `ty::tls` has a valid
1192 /// reference to the context, to allow formatting values that need it.
1193 pub fn create_and_enter<F, R>(s: &'tcx Session,
1194 cstore: &'tcx dyn CrateStore,
1195 local_providers: ty::maps::Providers<'tcx>,
1196 extern_providers: ty::maps::Providers<'tcx>,
1197 arenas: &'tcx AllArenas<'tcx>,
1198 resolutions: ty::Resolutions,
1199 hir: hir_map::Map<'tcx>,
1200 on_disk_query_result_cache: maps::OnDiskCache<'tcx>,
1202 tx: mpsc::Sender<Box<dyn Any + Send>>,
1203 output_filenames: &OutputFilenames,
1205 where F: for<'b> FnOnce(TyCtxt<'b, 'tcx, 'tcx>) -> R
1207 let data_layout = TargetDataLayout::parse(&s.target.target).unwrap_or_else(|err| {
1210 let interners = CtxtInterners::new(&arenas.interner);
1211 let common_types = CommonTypes::new(&interners);
1212 let dep_graph = hir.dep_graph.clone();
1213 let max_cnum = cstore.crates_untracked().iter().map(|c| c.as_usize()).max().unwrap_or(0);
1214 let mut providers = IndexVec::from_elem_n(extern_providers, max_cnum + 1);
1215 providers[LOCAL_CRATE] = local_providers;
1217 let def_path_hash_to_def_id = if s.opts.build_dep_graph() {
1218 let upstream_def_path_tables: Vec<(CrateNum, Lrc<_>)> = cstore
1221 .map(|&cnum| (cnum, cstore.def_path_table(cnum)))
1224 let def_path_tables = || {
1225 upstream_def_path_tables
1227 .map(|&(cnum, ref rc)| (cnum, &**rc))
1228 .chain(iter::once((LOCAL_CRATE, hir.definitions().def_path_table())))
1231 // Precompute the capacity of the hashmap so we don't have to
1232 // re-allocate when populating it.
1233 let capacity = def_path_tables().map(|(_, t)| t.size()).sum::<usize>();
1235 let mut map: FxHashMap<_, _> = FxHashMap::with_capacity_and_hasher(
1237 ::std::default::Default::default()
1240 for (cnum, def_path_table) in def_path_tables() {
1241 def_path_table.add_def_path_hashes_to(cnum, &mut map);
1249 let mut trait_map = FxHashMap();
1250 for (k, v) in resolutions.trait_map {
1251 let hir_id = hir.node_to_hir_id(k);
1252 let map = trait_map.entry(hir_id.owner)
1253 .or_insert_with(|| Lrc::new(FxHashMap()));
1254 Lrc::get_mut(map).unwrap()
1255 .insert(hir_id.local_id,
1256 Lrc::new(StableVec::new(v)));
1259 let gcx = &GlobalCtxt {
1262 global_arenas: &arenas.global,
1263 global_interners: interners,
1264 dep_graph: dep_graph.clone(),
1265 on_disk_query_result_cache,
1266 types: common_types,
1268 export_map: resolutions.export_map.into_iter().map(|(k, v)| {
1271 freevars: resolutions.freevars.into_iter().map(|(k, v)| {
1272 (hir.local_def_id(k), Lrc::new(v))
1274 maybe_unused_trait_imports:
1275 resolutions.maybe_unused_trait_imports
1277 .map(|id| hir.local_def_id(id))
1279 maybe_unused_extern_crates:
1280 resolutions.maybe_unused_extern_crates
1282 .map(|(id, sp)| (hir.local_def_id(id), sp))
1285 def_path_hash_to_def_id,
1286 maps: maps::Maps::new(providers),
1287 rcache: Lock::new(FxHashMap()),
1288 selection_cache: traits::SelectionCache::new(),
1289 evaluation_cache: traits::EvaluationCache::new(),
1290 crate_name: Symbol::intern(crate_name),
1292 layout_interner: Lock::new(FxHashSet()),
1293 stability_interner: Lock::new(FxHashSet()),
1294 interpret_interner: Default::default(),
1295 tx_to_llvm_workers: Lock::new(tx),
1296 output_filenames: Arc::new(output_filenames.clone()),
1299 tls::enter_global(gcx, f)
1302 pub fn consider_optimizing<T: Fn() -> String>(&self, msg: T) -> bool {
1303 let cname = self.crate_name(LOCAL_CRATE).as_str();
1304 self.sess.consider_optimizing(&cname, msg)
1307 pub fn lang_items(self) -> Lrc<middle::lang_items::LanguageItems> {
1308 self.get_lang_items(LOCAL_CRATE)
1311 /// Due to missing llvm support for lowering 128 bit math to software emulation
1312 /// (on some targets), the lowering can be done in MIR.
1314 /// This function only exists until said support is implemented.
1315 pub fn is_binop_lang_item(&self, def_id: DefId) -> Option<(mir::BinOp, bool)> {
1316 let items = self.lang_items();
1317 let def_id = Some(def_id);
1318 if items.i128_add_fn() == def_id { Some((mir::BinOp::Add, false)) }
1319 else if items.u128_add_fn() == def_id { Some((mir::BinOp::Add, false)) }
1320 else if items.i128_sub_fn() == def_id { Some((mir::BinOp::Sub, false)) }
1321 else if items.u128_sub_fn() == def_id { Some((mir::BinOp::Sub, false)) }
1322 else if items.i128_mul_fn() == def_id { Some((mir::BinOp::Mul, false)) }
1323 else if items.u128_mul_fn() == def_id { Some((mir::BinOp::Mul, false)) }
1324 else if items.i128_div_fn() == def_id { Some((mir::BinOp::Div, false)) }
1325 else if items.u128_div_fn() == def_id { Some((mir::BinOp::Div, false)) }
1326 else if items.i128_rem_fn() == def_id { Some((mir::BinOp::Rem, false)) }
1327 else if items.u128_rem_fn() == def_id { Some((mir::BinOp::Rem, false)) }
1328 else if items.i128_shl_fn() == def_id { Some((mir::BinOp::Shl, false)) }
1329 else if items.u128_shl_fn() == def_id { Some((mir::BinOp::Shl, false)) }
1330 else if items.i128_shr_fn() == def_id { Some((mir::BinOp::Shr, false)) }
1331 else if items.u128_shr_fn() == def_id { Some((mir::BinOp::Shr, false)) }
1332 else if items.i128_addo_fn() == def_id { Some((mir::BinOp::Add, true)) }
1333 else if items.u128_addo_fn() == def_id { Some((mir::BinOp::Add, true)) }
1334 else if items.i128_subo_fn() == def_id { Some((mir::BinOp::Sub, true)) }
1335 else if items.u128_subo_fn() == def_id { Some((mir::BinOp::Sub, true)) }
1336 else if items.i128_mulo_fn() == def_id { Some((mir::BinOp::Mul, true)) }
1337 else if items.u128_mulo_fn() == def_id { Some((mir::BinOp::Mul, true)) }
1338 else if items.i128_shlo_fn() == def_id { Some((mir::BinOp::Shl, true)) }
1339 else if items.u128_shlo_fn() == def_id { Some((mir::BinOp::Shl, true)) }
1340 else if items.i128_shro_fn() == def_id { Some((mir::BinOp::Shr, true)) }
1341 else if items.u128_shro_fn() == def_id { Some((mir::BinOp::Shr, true)) }
1345 pub fn stability(self) -> Lrc<stability::Index<'tcx>> {
1346 self.stability_index(LOCAL_CRATE)
1349 pub fn crates(self) -> Lrc<Vec<CrateNum>> {
1350 self.all_crate_nums(LOCAL_CRATE)
1353 pub fn features(self) -> Lrc<feature_gate::Features> {
1354 self.features_query(LOCAL_CRATE)
1357 pub fn def_key(self, id: DefId) -> hir_map::DefKey {
1359 self.hir.def_key(id)
1361 self.cstore.def_key(id)
1365 /// Convert a `DefId` into its fully expanded `DefPath` (every
1366 /// `DefId` is really just an interned def-path).
1368 /// Note that if `id` is not local to this crate, the result will
1369 /// be a non-local `DefPath`.
1370 pub fn def_path(self, id: DefId) -> hir_map::DefPath {
1372 self.hir.def_path(id)
1374 self.cstore.def_path(id)
1379 pub fn def_path_hash(self, def_id: DefId) -> hir_map::DefPathHash {
1380 if def_id.is_local() {
1381 self.hir.definitions().def_path_hash(def_id.index)
1383 self.cstore.def_path_hash(def_id)
1387 pub fn def_path_debug_str(self, def_id: DefId) -> String {
1388 // We are explicitly not going through queries here in order to get
1389 // crate name and disambiguator since this code is called from debug!()
1390 // statements within the query system and we'd run into endless
1391 // recursion otherwise.
1392 let (crate_name, crate_disambiguator) = if def_id.is_local() {
1393 (self.crate_name.clone(),
1394 self.sess.local_crate_disambiguator())
1396 (self.cstore.crate_name_untracked(def_id.krate),
1397 self.cstore.crate_disambiguator_untracked(def_id.krate))
1402 // Don't print the whole crate disambiguator. That's just
1403 // annoying in debug output.
1404 &(crate_disambiguator.to_fingerprint().to_hex())[..4],
1405 self.def_path(def_id).to_string_no_crate())
1408 pub fn metadata_encoding_version(self) -> Vec<u8> {
1409 self.cstore.metadata_encoding_version().to_vec()
1412 // Note that this is *untracked* and should only be used within the query
1413 // system if the result is otherwise tracked through queries
1414 pub fn crate_data_as_rc_any(self, cnum: CrateNum) -> Lrc<dyn Any> {
1415 self.cstore.crate_data_as_rc_any(cnum)
1418 pub fn create_stable_hashing_context(self) -> StableHashingContext<'a> {
1419 let krate = self.dep_graph.with_ignore(|| self.gcx.hir.krate());
1421 StableHashingContext::new(self.sess,
1423 self.hir.definitions(),
1427 // This method makes sure that we have a DepNode and a Fingerprint for
1428 // every upstream crate. It needs to be called once right after the tcx is
1430 // With full-fledged red/green, the method will probably become unnecessary
1431 // as this will be done on-demand.
1432 pub fn allocate_metadata_dep_nodes(self) {
1433 // We cannot use the query versions of crates() and crate_hash(), since
1434 // those would need the DepNodes that we are allocating here.
1435 for cnum in self.cstore.crates_untracked() {
1436 let dep_node = DepNode::new(self, DepConstructor::CrateMetadata(cnum));
1437 let crate_hash = self.cstore.crate_hash_untracked(cnum);
1438 self.dep_graph.with_task(dep_node,
1441 |_, x| x // No transformation needed
1446 // This method exercises the `in_scope_traits_map` query for all possible
1447 // values so that we have their fingerprints available in the DepGraph.
1448 // This is only required as long as we still use the old dependency tracking
1449 // which needs to have the fingerprints of all input nodes beforehand.
1450 pub fn precompute_in_scope_traits_hashes(self) {
1451 for &def_index in self.trait_map.keys() {
1452 self.in_scope_traits_map(def_index);
1456 pub fn serialize_query_result_cache<E>(self,
1458 -> Result<(), E::Error>
1459 where E: ty::codec::TyEncoder
1461 self.on_disk_query_result_cache.serialize(self.global_tcx(), encoder)
1464 /// If true, we should use the MIR-based borrowck (we may *also* use
1465 /// the AST-based borrowck).
1466 pub fn use_mir_borrowck(self) -> bool {
1467 self.borrowck_mode().use_mir()
1470 /// If true, we should enable two-phase borrows checks. This is
1471 /// done with either `-Ztwo-phase-borrows` or with
1472 /// `#![feature(nll)]`.
1473 pub fn two_phase_borrows(self) -> bool {
1474 self.features().nll || self.sess.opts.debugging_opts.two_phase_borrows
1477 /// What mode(s) of borrowck should we run? AST? MIR? both?
1478 /// (Also considers the `#![feature(nll)]` setting.)
1479 pub fn borrowck_mode(&self) -> BorrowckMode {
1480 match self.sess.opts.borrowck_mode {
1481 mode @ BorrowckMode::Mir |
1482 mode @ BorrowckMode::Compare => mode,
1484 mode @ BorrowckMode::Ast => {
1485 if self.features().nll {
1495 /// Should we emit EndRegion MIR statements? These are consumed by
1496 /// MIR borrowck, but not when NLL is used. They are also consumed
1497 /// by the validation stuff.
1498 pub fn emit_end_regions(self) -> bool {
1499 self.sess.opts.debugging_opts.emit_end_regions ||
1500 self.sess.opts.debugging_opts.mir_emit_validate > 0 ||
1501 self.use_mir_borrowck()
1505 pub fn share_generics(self) -> bool {
1506 match self.sess.opts.debugging_opts.share_generics {
1507 Some(setting) => setting,
1509 self.sess.opts.incremental.is_some() ||
1510 match self.sess.opts.optimize {
1514 OptLevel::SizeMin => true,
1516 OptLevel::Aggressive => false,
1523 pub fn local_crate_exports_generics(self) -> bool {
1524 debug_assert!(self.share_generics());
1526 self.sess.crate_types.borrow().iter().any(|crate_type| {
1528 CrateTypeExecutable |
1529 CrateTypeStaticlib |
1530 CrateTypeProcMacro |
1531 CrateTypeCdylib => false,
1533 CrateTypeDylib => true,
1539 impl<'a, 'tcx> TyCtxt<'a, 'tcx, 'tcx> {
1540 pub fn encode_metadata(self, link_meta: &LinkMeta)
1543 self.cstore.encode_metadata(self, link_meta)
1547 impl<'gcx: 'tcx, 'tcx> GlobalCtxt<'gcx> {
1548 /// Call the closure with a local `TyCtxt` using the given arena.
1549 pub fn enter_local<F, R>(
1551 arena: &'tcx SyncDroplessArena,
1555 F: for<'a> FnOnce(TyCtxt<'a, 'gcx, 'tcx>) -> R
1557 let interners = CtxtInterners::new(arena);
1560 interners: &interners,
1562 ty::tls::with_related_context(tcx.global_tcx(), |icx| {
1563 let new_icx = ty::tls::ImplicitCtxt {
1565 query: icx.query.clone(),
1566 layout_depth: icx.layout_depth,
1569 ty::tls::enter_context(&new_icx, |new_icx| {
1576 /// A trait implemented for all X<'a> types which can be safely and
1577 /// efficiently converted to X<'tcx> as long as they are part of the
1578 /// provided TyCtxt<'tcx>.
1579 /// This can be done, for example, for Ty<'tcx> or &'tcx Substs<'tcx>
1580 /// by looking them up in their respective interners.
1582 /// However, this is still not the best implementation as it does
1583 /// need to compare the components, even for interned values.
1584 /// It would be more efficient if TypedArena provided a way to
1585 /// determine whether the address is in the allocated range.
1587 /// None is returned if the value or one of the components is not part
1588 /// of the provided context.
1589 /// For Ty, None can be returned if either the type interner doesn't
1590 /// contain the TypeVariants key or if the address of the interned
1591 /// pointer differs. The latter case is possible if a primitive type,
1592 /// e.g. `()` or `u8`, was interned in a different context.
1593 pub trait Lift<'tcx> {
1595 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted>;
1598 impl<'a, 'tcx> Lift<'tcx> for Ty<'a> {
1599 type Lifted = Ty<'tcx>;
1600 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Ty<'tcx>> {
1601 if tcx.interners.arena.in_arena(*self as *const _) {
1602 return Some(unsafe { mem::transmute(*self) });
1604 // Also try in the global tcx if we're not that.
1605 if !tcx.is_global() {
1606 self.lift_to_tcx(tcx.global_tcx())
1613 impl<'a, 'tcx> Lift<'tcx> for Region<'a> {
1614 type Lifted = Region<'tcx>;
1615 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Region<'tcx>> {
1616 if tcx.interners.arena.in_arena(*self as *const _) {
1617 return Some(unsafe { mem::transmute(*self) });
1619 // Also try in the global tcx if we're not that.
1620 if !tcx.is_global() {
1621 self.lift_to_tcx(tcx.global_tcx())
1628 impl<'a, 'tcx> Lift<'tcx> for &'a Const<'a> {
1629 type Lifted = &'tcx Const<'tcx>;
1630 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<&'tcx Const<'tcx>> {
1631 if tcx.interners.arena.in_arena(*self as *const _) {
1632 return Some(unsafe { mem::transmute(*self) });
1634 // Also try in the global tcx if we're not that.
1635 if !tcx.is_global() {
1636 self.lift_to_tcx(tcx.global_tcx())
1643 impl<'a, 'tcx> Lift<'tcx> for &'a Substs<'a> {
1644 type Lifted = &'tcx Substs<'tcx>;
1645 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<&'tcx Substs<'tcx>> {
1646 if self.len() == 0 {
1647 return Some(Slice::empty());
1649 if tcx.interners.arena.in_arena(&self[..] as *const _) {
1650 return Some(unsafe { mem::transmute(*self) });
1652 // Also try in the global tcx if we're not that.
1653 if !tcx.is_global() {
1654 self.lift_to_tcx(tcx.global_tcx())
1661 impl<'a, 'tcx> Lift<'tcx> for &'a Slice<Ty<'a>> {
1662 type Lifted = &'tcx Slice<Ty<'tcx>>;
1663 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
1664 -> Option<&'tcx Slice<Ty<'tcx>>> {
1665 if self.len() == 0 {
1666 return Some(Slice::empty());
1668 if tcx.interners.arena.in_arena(*self as *const _) {
1669 return Some(unsafe { mem::transmute(*self) });
1671 // Also try in the global tcx if we're not that.
1672 if !tcx.is_global() {
1673 self.lift_to_tcx(tcx.global_tcx())
1680 impl<'a, 'tcx> Lift<'tcx> for &'a Slice<ExistentialPredicate<'a>> {
1681 type Lifted = &'tcx Slice<ExistentialPredicate<'tcx>>;
1682 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
1683 -> Option<&'tcx Slice<ExistentialPredicate<'tcx>>> {
1684 if self.is_empty() {
1685 return Some(Slice::empty());
1687 if tcx.interners.arena.in_arena(*self as *const _) {
1688 return Some(unsafe { mem::transmute(*self) });
1690 // Also try in the global tcx if we're not that.
1691 if !tcx.is_global() {
1692 self.lift_to_tcx(tcx.global_tcx())
1699 impl<'a, 'tcx> Lift<'tcx> for &'a Slice<Predicate<'a>> {
1700 type Lifted = &'tcx Slice<Predicate<'tcx>>;
1701 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
1702 -> Option<&'tcx Slice<Predicate<'tcx>>> {
1703 if self.is_empty() {
1704 return Some(Slice::empty());
1706 if tcx.interners.arena.in_arena(*self as *const _) {
1707 return Some(unsafe { mem::transmute(*self) });
1709 // Also try in the global tcx if we're not that.
1710 if !tcx.is_global() {
1711 self.lift_to_tcx(tcx.global_tcx())
1718 impl<'a, 'tcx> Lift<'tcx> for &'a Slice<CanonicalVarInfo> {
1719 type Lifted = &'tcx Slice<CanonicalVarInfo>;
1720 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
1721 if self.len() == 0 {
1722 return Some(Slice::empty());
1724 if tcx.interners.arena.in_arena(*self as *const _) {
1725 return Some(unsafe { mem::transmute(*self) });
1727 // Also try in the global tcx if we're not that.
1728 if !tcx.is_global() {
1729 self.lift_to_tcx(tcx.global_tcx())
1737 use super::{GlobalCtxt, TyCtxt};
1739 use std::cell::Cell;
1744 use errors::{Diagnostic, TRACK_DIAGNOSTICS};
1745 use rustc_data_structures::OnDrop;
1746 use rustc_data_structures::sync::Lrc;
1747 use dep_graph::OpenTask;
1749 /// This is the implicit state of rustc. It contains the current
1750 /// TyCtxt and query. It is updated when creating a local interner or
1751 /// executing a new query. Whenever there's a TyCtxt value available
1752 /// you should also have access to an ImplicitCtxt through the functions
1755 pub struct ImplicitCtxt<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
1756 /// The current TyCtxt. Initially created by `enter_global` and updated
1757 /// by `enter_local` with a new local interner
1758 pub tcx: TyCtxt<'a, 'gcx, 'tcx>,
1760 /// The current query job, if any. This is updated by start_job in
1761 /// ty::maps::plumbing when executing a query
1762 pub query: Option<Lrc<maps::QueryJob<'gcx>>>,
1764 /// Used to prevent layout from recursing too deeply.
1765 pub layout_depth: usize,
1767 /// The current dep graph task. This is used to add dependencies to queries
1768 /// when executing them
1769 pub task: &'a OpenTask,
1772 // A thread local value which stores a pointer to the current ImplicitCtxt
1773 thread_local!(static TLV: Cell<usize> = Cell::new(0));
1775 fn set_tlv<F: FnOnce() -> R, R>(value: usize, f: F) -> R {
1776 let old = get_tlv();
1777 let _reset = OnDrop(move || TLV.with(|tlv| tlv.set(old)));
1778 TLV.with(|tlv| tlv.set(value));
1782 fn get_tlv() -> usize {
1783 TLV.with(|tlv| tlv.get())
1786 /// This is a callback from libsyntax as it cannot access the implicit state
1787 /// in librustc otherwise
1788 fn span_debug(span: syntax_pos::Span, f: &mut fmt::Formatter) -> fmt::Result {
1790 write!(f, "{}", tcx.sess.codemap().span_to_string(span))
1794 /// This is a callback from libsyntax as it cannot access the implicit state
1795 /// in librustc otherwise. It is used to when diagnostic messages are
1796 /// emitted and stores them in the current query, if there is one.
1797 fn track_diagnostic(diagnostic: &Diagnostic) {
1798 with_context(|context| {
1799 if let Some(ref query) = context.query {
1800 query.diagnostics.lock().push(diagnostic.clone());
1805 /// Sets up the callbacks from libsyntax on the current thread
1806 pub fn with_thread_locals<F, R>(f: F) -> R
1807 where F: FnOnce() -> R
1809 syntax_pos::SPAN_DEBUG.with(|span_dbg| {
1810 let original_span_debug = span_dbg.get();
1811 span_dbg.set(span_debug);
1813 let _on_drop = OnDrop(move || {
1814 span_dbg.set(original_span_debug);
1817 TRACK_DIAGNOSTICS.with(|current| {
1818 let original = current.get();
1819 current.set(track_diagnostic);
1821 let _on_drop = OnDrop(move || {
1822 current.set(original);
1830 /// Sets `context` as the new current ImplicitCtxt for the duration of the function `f`
1831 pub fn enter_context<'a, 'gcx: 'tcx, 'tcx, F, R>(context: &ImplicitCtxt<'a, 'gcx, 'tcx>,
1833 where F: FnOnce(&ImplicitCtxt<'a, 'gcx, 'tcx>) -> R
1835 set_tlv(context as *const _ as usize, || {
1840 /// Enters GlobalCtxt by setting up libsyntax callbacks and
1841 /// creating a initial TyCtxt and ImplicitCtxt.
1842 /// This happens once per rustc session and TyCtxts only exists
1843 /// inside the `f` function.
1844 pub fn enter_global<'gcx, F, R>(gcx: &GlobalCtxt<'gcx>, f: F) -> R
1845 where F: for<'a> FnOnce(TyCtxt<'a, 'gcx, 'gcx>) -> R
1847 with_thread_locals(|| {
1850 interners: &gcx.global_interners,
1852 let icx = ImplicitCtxt {
1856 task: &OpenTask::Ignore,
1858 enter_context(&icx, |_| {
1864 /// Allows access to the current ImplicitCtxt in a closure if one is available
1865 pub fn with_context_opt<F, R>(f: F) -> R
1866 where F: for<'a, 'gcx, 'tcx> FnOnce(Option<&ImplicitCtxt<'a, 'gcx, 'tcx>>) -> R
1868 let context = get_tlv();
1872 unsafe { f(Some(&*(context as *const ImplicitCtxt))) }
1876 /// Allows access to the current ImplicitCtxt.
1877 /// Panics if there is no ImplicitCtxt available
1878 pub fn with_context<F, R>(f: F) -> R
1879 where F: for<'a, 'gcx, 'tcx> FnOnce(&ImplicitCtxt<'a, 'gcx, 'tcx>) -> R
1881 with_context_opt(|opt_context| f(opt_context.expect("no ImplicitCtxt stored in tls")))
1884 /// Allows access to the current ImplicitCtxt whose tcx field has the same global
1885 /// interner as the tcx argument passed in. This means the closure is given an ImplicitCtxt
1886 /// with the same 'gcx lifetime as the TyCtxt passed in.
1887 /// This will panic if you pass it a TyCtxt which has a different global interner from
1888 /// the current ImplicitCtxt's tcx field.
1889 pub fn with_related_context<'a, 'gcx, 'tcx1, F, R>(tcx: TyCtxt<'a, 'gcx, 'tcx1>, f: F) -> R
1890 where F: for<'b, 'tcx2> FnOnce(&ImplicitCtxt<'b, 'gcx, 'tcx2>) -> R
1892 with_context(|context| {
1894 let gcx = tcx.gcx as *const _ as usize;
1895 assert!(context.tcx.gcx as *const _ as usize == gcx);
1896 let context: &ImplicitCtxt = mem::transmute(context);
1902 /// Allows access to the current ImplicitCtxt whose tcx field has the same global
1903 /// interner and local interner as the tcx argument passed in. This means the closure
1904 /// is given an ImplicitCtxt with the same 'tcx and 'gcx lifetimes as the TyCtxt passed in.
1905 /// This will panic if you pass it a TyCtxt which has a different global interner or
1906 /// a different local interner from the current ImplicitCtxt's tcx field.
1907 pub fn with_fully_related_context<'a, 'gcx, 'tcx, F, R>(tcx: TyCtxt<'a, 'gcx, 'tcx>, f: F) -> R
1908 where F: for<'b> FnOnce(&ImplicitCtxt<'b, 'gcx, 'tcx>) -> R
1910 with_context(|context| {
1912 let gcx = tcx.gcx as *const _ as usize;
1913 let interners = tcx.interners as *const _ as usize;
1914 assert!(context.tcx.gcx as *const _ as usize == gcx);
1915 assert!(context.tcx.interners as *const _ as usize == interners);
1916 let context: &ImplicitCtxt = mem::transmute(context);
1922 /// Allows access to the TyCtxt in the current ImplicitCtxt.
1923 /// Panics if there is no ImplicitCtxt available
1924 pub fn with<F, R>(f: F) -> R
1925 where F: for<'a, 'gcx, 'tcx> FnOnce(TyCtxt<'a, 'gcx, 'tcx>) -> R
1927 with_context(|context| f(context.tcx))
1930 /// Allows access to the TyCtxt in the current ImplicitCtxt.
1931 /// The closure is passed None if there is no ImplicitCtxt available
1932 pub fn with_opt<F, R>(f: F) -> R
1933 where F: for<'a, 'gcx, 'tcx> FnOnce(Option<TyCtxt<'a, 'gcx, 'tcx>>) -> R
1935 with_context_opt(|opt_context| f(opt_context.map(|context| context.tcx)))
1939 macro_rules! sty_debug_print {
1940 ($ctxt: expr, $($variant: ident),*) => {{
1941 // curious inner module to allow variant names to be used as
1943 #[allow(non_snake_case)]
1945 use ty::{self, TyCtxt};
1946 use ty::context::Interned;
1948 #[derive(Copy, Clone)]
1951 region_infer: usize,
1956 pub fn go(tcx: TyCtxt) {
1957 let mut total = DebugStat {
1959 region_infer: 0, ty_infer: 0, both_infer: 0,
1961 $(let mut $variant = total;)*
1964 for &Interned(t) in tcx.interners.type_.borrow().iter() {
1965 let variant = match t.sty {
1966 ty::TyBool | ty::TyChar | ty::TyInt(..) | ty::TyUint(..) |
1967 ty::TyFloat(..) | ty::TyStr | ty::TyNever => continue,
1968 ty::TyError => /* unimportant */ continue,
1969 $(ty::$variant(..) => &mut $variant,)*
1971 let region = t.flags.intersects(ty::TypeFlags::HAS_RE_INFER);
1972 let ty = t.flags.intersects(ty::TypeFlags::HAS_TY_INFER);
1976 if region { total.region_infer += 1; variant.region_infer += 1 }
1977 if ty { total.ty_infer += 1; variant.ty_infer += 1 }
1978 if region && ty { total.both_infer += 1; variant.both_infer += 1 }
1980 println!("Ty interner total ty region both");
1981 $(println!(" {:18}: {uses:6} {usespc:4.1}%, \
1982 {ty:4.1}% {region:5.1}% {both:4.1}%",
1983 stringify!($variant),
1984 uses = $variant.total,
1985 usespc = $variant.total as f64 * 100.0 / total.total as f64,
1986 ty = $variant.ty_infer as f64 * 100.0 / total.total as f64,
1987 region = $variant.region_infer as f64 * 100.0 / total.total as f64,
1988 both = $variant.both_infer as f64 * 100.0 / total.total as f64);
1990 println!(" total {uses:6} \
1991 {ty:4.1}% {region:5.1}% {both:4.1}%",
1993 ty = total.ty_infer as f64 * 100.0 / total.total as f64,
1994 region = total.region_infer as f64 * 100.0 / total.total as f64,
1995 both = total.both_infer as f64 * 100.0 / total.total as f64)
2003 impl<'a, 'tcx> TyCtxt<'a, 'tcx, 'tcx> {
2004 pub fn print_debug_stats(self) {
2007 TyAdt, TyArray, TySlice, TyRawPtr, TyRef, TyFnDef, TyFnPtr,
2008 TyGenerator, TyGeneratorWitness, TyDynamic, TyClosure, TyTuple,
2009 TyParam, TyInfer, TyProjection, TyAnon, TyForeign);
2011 println!("Substs interner: #{}", self.interners.substs.borrow().len());
2012 println!("Region interner: #{}", self.interners.region.borrow().len());
2013 println!("Stability interner: #{}", self.stability_interner.borrow().len());
2014 println!("Interpret interner: #{}", self.interpret_interner.inner.borrow().allocs.len());
2015 println!("Layout interner: #{}", self.layout_interner.borrow().len());
2020 /// An entry in an interner.
2021 struct Interned<'tcx, T: 'tcx+?Sized>(&'tcx T);
2023 // NB: An Interned<Ty> compares and hashes as a sty.
2024 impl<'tcx> PartialEq for Interned<'tcx, TyS<'tcx>> {
2025 fn eq(&self, other: &Interned<'tcx, TyS<'tcx>>) -> bool {
2026 self.0.sty == other.0.sty
2030 impl<'tcx> Eq for Interned<'tcx, TyS<'tcx>> {}
2032 impl<'tcx> Hash for Interned<'tcx, TyS<'tcx>> {
2033 fn hash<H: Hasher>(&self, s: &mut H) {
2038 impl<'tcx: 'lcx, 'lcx> Borrow<TypeVariants<'lcx>> for Interned<'tcx, TyS<'tcx>> {
2039 fn borrow<'a>(&'a self) -> &'a TypeVariants<'lcx> {
2044 // NB: An Interned<Slice<T>> compares and hashes as its elements.
2045 impl<'tcx, T: PartialEq> PartialEq for Interned<'tcx, Slice<T>> {
2046 fn eq(&self, other: &Interned<'tcx, Slice<T>>) -> bool {
2047 self.0[..] == other.0[..]
2051 impl<'tcx, T: Eq> Eq for Interned<'tcx, Slice<T>> {}
2053 impl<'tcx, T: Hash> Hash for Interned<'tcx, Slice<T>> {
2054 fn hash<H: Hasher>(&self, s: &mut H) {
2059 impl<'tcx: 'lcx, 'lcx> Borrow<[Ty<'lcx>]> for Interned<'tcx, Slice<Ty<'tcx>>> {
2060 fn borrow<'a>(&'a self) -> &'a [Ty<'lcx>] {
2065 impl<'tcx: 'lcx, 'lcx> Borrow<[CanonicalVarInfo]> for Interned<'tcx, Slice<CanonicalVarInfo>> {
2066 fn borrow<'a>(&'a self) -> &'a [CanonicalVarInfo] {
2071 impl<'tcx: 'lcx, 'lcx> Borrow<[Kind<'lcx>]> for Interned<'tcx, Substs<'tcx>> {
2072 fn borrow<'a>(&'a self) -> &'a [Kind<'lcx>] {
2077 impl<'tcx> Borrow<RegionKind> for Interned<'tcx, RegionKind> {
2078 fn borrow<'a>(&'a self) -> &'a RegionKind {
2083 impl<'tcx: 'lcx, 'lcx> Borrow<[ExistentialPredicate<'lcx>]>
2084 for Interned<'tcx, Slice<ExistentialPredicate<'tcx>>> {
2085 fn borrow<'a>(&'a self) -> &'a [ExistentialPredicate<'lcx>] {
2090 impl<'tcx: 'lcx, 'lcx> Borrow<[Predicate<'lcx>]>
2091 for Interned<'tcx, Slice<Predicate<'tcx>>> {
2092 fn borrow<'a>(&'a self) -> &'a [Predicate<'lcx>] {
2097 impl<'tcx: 'lcx, 'lcx> Borrow<Const<'lcx>> for Interned<'tcx, Const<'tcx>> {
2098 fn borrow<'a>(&'a self) -> &'a Const<'lcx> {
2103 impl<'tcx: 'lcx, 'lcx> Borrow<[Clause<'lcx>]>
2104 for Interned<'tcx, Slice<Clause<'tcx>>> {
2105 fn borrow<'a>(&'a self) -> &'a [Clause<'lcx>] {
2110 impl<'tcx: 'lcx, 'lcx> Borrow<[Goal<'lcx>]>
2111 for Interned<'tcx, Slice<Goal<'tcx>>> {
2112 fn borrow<'a>(&'a self) -> &'a [Goal<'lcx>] {
2117 macro_rules! intern_method {
2118 ($lt_tcx:tt, $name:ident: $method:ident($alloc:ty,
2119 $alloc_method:ident,
2122 $needs_infer:expr) -> $ty:ty) => {
2123 impl<'a, 'gcx, $lt_tcx> TyCtxt<'a, 'gcx, $lt_tcx> {
2124 pub fn $method(self, v: $alloc) -> &$lt_tcx $ty {
2126 let key = ($alloc_to_key)(&v);
2127 if let Some(i) = self.interners.$name.borrow().get(key) {
2130 if !self.is_global() {
2131 if let Some(i) = self.global_interners.$name.borrow().get(key) {
2137 // HACK(eddyb) Depend on flags being accurate to
2138 // determine that all contents are in the global tcx.
2139 // See comments on Lift for why we can't use that.
2140 if !($needs_infer)(&v) {
2141 if !self.is_global() {
2145 let i = ($alloc_to_ret)(self.global_interners.arena.$alloc_method(v));
2146 self.global_interners.$name.borrow_mut().insert(Interned(i));
2150 // Make sure we don't end up with inference
2151 // types/regions in the global tcx.
2152 if self.is_global() {
2153 bug!("Attempted to intern `{:?}` which contains \
2154 inference types/regions in the global type context",
2159 let i = ($alloc_to_ret)(self.interners.arena.$alloc_method(v));
2160 self.interners.$name.borrow_mut().insert(Interned(i));
2167 macro_rules! direct_interners {
2168 ($lt_tcx:tt, $($name:ident: $method:ident($needs_infer:expr) -> $ty:ty),+) => {
2169 $(impl<$lt_tcx> PartialEq for Interned<$lt_tcx, $ty> {
2170 fn eq(&self, other: &Self) -> bool {
2175 impl<$lt_tcx> Eq for Interned<$lt_tcx, $ty> {}
2177 impl<$lt_tcx> Hash for Interned<$lt_tcx, $ty> {
2178 fn hash<H: Hasher>(&self, s: &mut H) {
2183 intern_method!($lt_tcx, $name: $method($ty, alloc, |x| x, |x| x, $needs_infer) -> $ty);)+
2187 pub fn keep_local<'tcx, T: ty::TypeFoldable<'tcx>>(x: &T) -> bool {
2188 x.has_type_flags(ty::TypeFlags::KEEP_IN_LOCAL_TCX)
2191 direct_interners!('tcx,
2192 region: mk_region(|r| {
2194 &ty::ReVar(_) | &ty::ReSkolemized(..) => true,
2198 const_: mk_const(|c: &Const| keep_local(&c.ty) || keep_local(&c.val)) -> Const<'tcx>
2201 macro_rules! slice_interners {
2202 ($($field:ident: $method:ident($ty:ident)),+) => (
2203 $(intern_method!('tcx, $field: $method(&[$ty<'tcx>], alloc_slice, Deref::deref,
2204 |xs: &[$ty]| -> &Slice<$ty> {
2205 unsafe { mem::transmute(xs) }
2206 }, |xs: &[$ty]| xs.iter().any(keep_local)) -> Slice<$ty<'tcx>>);)+
2211 existential_predicates: _intern_existential_predicates(ExistentialPredicate),
2212 predicates: _intern_predicates(Predicate),
2213 type_list: _intern_type_list(Ty),
2214 substs: _intern_substs(Kind),
2215 clauses: _intern_clauses(Clause),
2216 goals: _intern_goals(Goal)
2219 // This isn't a perfect fit: CanonicalVarInfo slices are always
2220 // allocated in the global arena, so this `intern_method!` macro is
2221 // overly general. But we just return false for the code that checks
2222 // whether they belong in the thread-local arena, so no harm done, and
2223 // seems better than open-coding the rest.
2226 canonical_var_infos: _intern_canonical_var_infos(
2227 &[CanonicalVarInfo],
2230 |xs: &[CanonicalVarInfo]| -> &Slice<CanonicalVarInfo> { unsafe { mem::transmute(xs) } },
2231 |_xs: &[CanonicalVarInfo]| -> bool { false }
2232 ) -> Slice<CanonicalVarInfo>
2235 impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
2236 /// Given a `fn` type, returns an equivalent `unsafe fn` type;
2237 /// that is, a `fn` type that is equivalent in every way for being
2239 pub fn safe_to_unsafe_fn_ty(self, sig: PolyFnSig<'tcx>) -> Ty<'tcx> {
2240 assert_eq!(sig.unsafety(), hir::Unsafety::Normal);
2241 self.mk_fn_ptr(sig.map_bound(|sig| ty::FnSig {
2242 unsafety: hir::Unsafety::Unsafe,
2247 /// Given a closure signature `sig`, returns an equivalent `fn`
2248 /// type with the same signature. Detuples and so forth -- so
2249 /// e.g. if we have a sig with `Fn<(u32, i32)>` then you would get
2250 /// a `fn(u32, i32)`.
2251 pub fn coerce_closure_fn_ty(self, sig: PolyFnSig<'tcx>) -> Ty<'tcx> {
2252 let converted_sig = sig.map_bound(|s| {
2253 let params_iter = match s.inputs()[0].sty {
2254 ty::TyTuple(params) => {
2255 params.into_iter().cloned()
2263 hir::Unsafety::Normal,
2268 self.mk_fn_ptr(converted_sig)
2271 // Interns a type/name combination, stores the resulting box in cx.interners,
2272 // and returns the box as cast to an unsafe ptr (see comments for Ty above).
2273 pub fn mk_ty(self, st: TypeVariants<'tcx>) -> Ty<'tcx> {
2274 let global_interners = if !self.is_global() {
2275 Some(&self.global_interners)
2279 self.interners.intern_ty(st, global_interners)
2282 pub fn mk_mach_int(self, tm: ast::IntTy) -> Ty<'tcx> {
2284 ast::IntTy::Isize => self.types.isize,
2285 ast::IntTy::I8 => self.types.i8,
2286 ast::IntTy::I16 => self.types.i16,
2287 ast::IntTy::I32 => self.types.i32,
2288 ast::IntTy::I64 => self.types.i64,
2289 ast::IntTy::I128 => self.types.i128,
2293 pub fn mk_mach_uint(self, tm: ast::UintTy) -> Ty<'tcx> {
2295 ast::UintTy::Usize => self.types.usize,
2296 ast::UintTy::U8 => self.types.u8,
2297 ast::UintTy::U16 => self.types.u16,
2298 ast::UintTy::U32 => self.types.u32,
2299 ast::UintTy::U64 => self.types.u64,
2300 ast::UintTy::U128 => self.types.u128,
2304 pub fn mk_mach_float(self, tm: ast::FloatTy) -> Ty<'tcx> {
2306 ast::FloatTy::F32 => self.types.f32,
2307 ast::FloatTy::F64 => self.types.f64,
2311 pub fn mk_str(self) -> Ty<'tcx> {
2315 pub fn mk_static_str(self) -> Ty<'tcx> {
2316 self.mk_imm_ref(self.types.re_static, self.mk_str())
2319 pub fn mk_adt(self, def: &'tcx AdtDef, substs: &'tcx Substs<'tcx>) -> Ty<'tcx> {
2320 // take a copy of substs so that we own the vectors inside
2321 self.mk_ty(TyAdt(def, substs))
2324 pub fn mk_foreign(self, def_id: DefId) -> Ty<'tcx> {
2325 self.mk_ty(TyForeign(def_id))
2328 pub fn mk_box(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2329 let def_id = self.require_lang_item(lang_items::OwnedBoxLangItem);
2330 let adt_def = self.adt_def(def_id);
2331 let substs = self.mk_substs(iter::once(Kind::from(ty)));
2332 self.mk_ty(TyAdt(adt_def, substs))
2335 pub fn mk_ptr(self, tm: TypeAndMut<'tcx>) -> Ty<'tcx> {
2336 self.mk_ty(TyRawPtr(tm))
2339 pub fn mk_ref(self, r: Region<'tcx>, tm: TypeAndMut<'tcx>) -> Ty<'tcx> {
2340 self.mk_ty(TyRef(r, tm))
2343 pub fn mk_mut_ref(self, r: Region<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
2344 self.mk_ref(r, TypeAndMut {ty: ty, mutbl: hir::MutMutable})
2347 pub fn mk_imm_ref(self, r: Region<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
2348 self.mk_ref(r, TypeAndMut {ty: ty, mutbl: hir::MutImmutable})
2351 pub fn mk_mut_ptr(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2352 self.mk_ptr(TypeAndMut {ty: ty, mutbl: hir::MutMutable})
2355 pub fn mk_imm_ptr(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2356 self.mk_ptr(TypeAndMut {ty: ty, mutbl: hir::MutImmutable})
2359 pub fn mk_nil_ptr(self) -> Ty<'tcx> {
2360 self.mk_imm_ptr(self.mk_nil())
2363 pub fn mk_array(self, ty: Ty<'tcx>, n: u64) -> Ty<'tcx> {
2364 self.mk_ty(TyArray(ty, self.mk_const(ty::Const {
2365 val: ConstVal::Value(Value::ByVal(PrimVal::Bytes(n.into()))),
2366 ty: self.types.usize
2370 pub fn mk_slice(self, ty: Ty<'tcx>) -> Ty<'tcx> {
2371 self.mk_ty(TySlice(ty))
2374 pub fn intern_tup(self, ts: &[Ty<'tcx>]) -> Ty<'tcx> {
2375 self.mk_ty(TyTuple(self.intern_type_list(ts)))
2378 pub fn mk_tup<I: InternAs<[Ty<'tcx>], Ty<'tcx>>>(self, iter: I) -> I::Output {
2379 iter.intern_with(|ts| self.mk_ty(TyTuple(self.intern_type_list(ts))))
2382 pub fn mk_nil(self) -> Ty<'tcx> {
2383 self.intern_tup(&[])
2386 pub fn mk_diverging_default(self) -> Ty<'tcx> {
2387 if self.features().never_type {
2390 self.intern_tup(&[])
2394 pub fn mk_bool(self) -> Ty<'tcx> {
2398 pub fn mk_fn_def(self, def_id: DefId,
2399 substs: &'tcx Substs<'tcx>) -> Ty<'tcx> {
2400 self.mk_ty(TyFnDef(def_id, substs))
2403 pub fn mk_fn_ptr(self, fty: PolyFnSig<'tcx>) -> Ty<'tcx> {
2404 self.mk_ty(TyFnPtr(fty))
2409 obj: ty::Binder<&'tcx Slice<ExistentialPredicate<'tcx>>>,
2410 reg: ty::Region<'tcx>
2412 self.mk_ty(TyDynamic(obj, reg))
2415 pub fn mk_projection(self,
2417 substs: &'tcx Substs<'tcx>)
2419 self.mk_ty(TyProjection(ProjectionTy {
2425 pub fn mk_closure(self,
2427 substs: ClosureSubsts<'tcx>)
2429 self.mk_closure_from_closure_substs(closure_id, substs)
2432 pub fn mk_closure_from_closure_substs(self,
2434 closure_substs: ClosureSubsts<'tcx>)
2436 self.mk_ty(TyClosure(closure_id, closure_substs))
2439 pub fn mk_generator(self,
2441 closure_substs: ClosureSubsts<'tcx>,
2442 interior: GeneratorInterior<'tcx>)
2444 self.mk_ty(TyGenerator(id, closure_substs, interior))
2447 pub fn mk_generator_witness(self, types: ty::Binder<&'tcx Slice<Ty<'tcx>>>) -> Ty<'tcx> {
2448 self.mk_ty(TyGeneratorWitness(types))
2451 pub fn mk_var(self, v: TyVid) -> Ty<'tcx> {
2452 self.mk_infer(TyVar(v))
2455 pub fn mk_int_var(self, v: IntVid) -> Ty<'tcx> {
2456 self.mk_infer(IntVar(v))
2459 pub fn mk_float_var(self, v: FloatVid) -> Ty<'tcx> {
2460 self.mk_infer(FloatVar(v))
2463 pub fn mk_infer(self, it: InferTy) -> Ty<'tcx> {
2464 self.mk_ty(TyInfer(it))
2467 pub fn mk_param(self,
2469 name: InternedString) -> Ty<'tcx> {
2470 self.mk_ty(TyParam(ParamTy { idx: index, name: name }))
2473 pub fn mk_self_type(self) -> Ty<'tcx> {
2474 self.mk_param(0, keywords::SelfType.name().as_str())
2477 pub fn mk_param_from_def(self, def: &ty::TypeParameterDef) -> Ty<'tcx> {
2478 self.mk_param(def.index, def.name)
2481 pub fn mk_anon(self, def_id: DefId, substs: &'tcx Substs<'tcx>) -> Ty<'tcx> {
2482 self.mk_ty(TyAnon(def_id, substs))
2485 pub fn intern_existential_predicates(self, eps: &[ExistentialPredicate<'tcx>])
2486 -> &'tcx Slice<ExistentialPredicate<'tcx>> {
2487 assert!(!eps.is_empty());
2488 assert!(eps.windows(2).all(|w| w[0].cmp(self, &w[1]) != Ordering::Greater));
2489 self._intern_existential_predicates(eps)
2492 pub fn intern_predicates(self, preds: &[Predicate<'tcx>])
2493 -> &'tcx Slice<Predicate<'tcx>> {
2494 // FIXME consider asking the input slice to be sorted to avoid
2495 // re-interning permutations, in which case that would be asserted
2497 if preds.len() == 0 {
2498 // The macro-generated method below asserts we don't intern an empty slice.
2501 self._intern_predicates(preds)
2505 pub fn intern_type_list(self, ts: &[Ty<'tcx>]) -> &'tcx Slice<Ty<'tcx>> {
2509 self._intern_type_list(ts)
2513 pub fn intern_substs(self, ts: &[Kind<'tcx>]) -> &'tcx Slice<Kind<'tcx>> {
2517 self._intern_substs(ts)
2521 pub fn intern_canonical_var_infos(self, ts: &[CanonicalVarInfo]) -> CanonicalVarInfos<'gcx> {
2525 self.global_tcx()._intern_canonical_var_infos(ts)
2529 pub fn intern_clauses(self, ts: &[Clause<'tcx>]) -> Clauses<'tcx> {
2533 self._intern_clauses(ts)
2537 pub fn intern_goals(self, ts: &[Goal<'tcx>]) -> Goals<'tcx> {
2541 self._intern_goals(ts)
2545 pub fn mk_fn_sig<I>(self,
2549 unsafety: hir::Unsafety,
2551 -> <I::Item as InternIteratorElement<Ty<'tcx>, ty::FnSig<'tcx>>>::Output
2553 I::Item: InternIteratorElement<Ty<'tcx>, ty::FnSig<'tcx>>
2555 inputs.chain(iter::once(output)).intern_with(|xs| ty::FnSig {
2556 inputs_and_output: self.intern_type_list(xs),
2557 variadic, unsafety, abi
2561 pub fn mk_existential_predicates<I: InternAs<[ExistentialPredicate<'tcx>],
2562 &'tcx Slice<ExistentialPredicate<'tcx>>>>(self, iter: I)
2564 iter.intern_with(|xs| self.intern_existential_predicates(xs))
2567 pub fn mk_predicates<I: InternAs<[Predicate<'tcx>],
2568 &'tcx Slice<Predicate<'tcx>>>>(self, iter: I)
2570 iter.intern_with(|xs| self.intern_predicates(xs))
2573 pub fn mk_type_list<I: InternAs<[Ty<'tcx>],
2574 &'tcx Slice<Ty<'tcx>>>>(self, iter: I) -> I::Output {
2575 iter.intern_with(|xs| self.intern_type_list(xs))
2578 pub fn mk_substs<I: InternAs<[Kind<'tcx>],
2579 &'tcx Slice<Kind<'tcx>>>>(self, iter: I) -> I::Output {
2580 iter.intern_with(|xs| self.intern_substs(xs))
2583 pub fn mk_substs_trait(self,
2586 -> &'tcx Substs<'tcx>
2588 self.mk_substs(iter::once(s).chain(t.into_iter().cloned()).map(Kind::from))
2591 pub fn mk_clauses<I: InternAs<[Clause<'tcx>], Clauses<'tcx>>>(self, iter: I) -> I::Output {
2592 iter.intern_with(|xs| self.intern_clauses(xs))
2595 pub fn mk_goals<I: InternAs<[Goal<'tcx>], Goals<'tcx>>>(self, iter: I) -> I::Output {
2596 iter.intern_with(|xs| self.intern_goals(xs))
2599 pub fn mk_goal(self, goal: Goal<'tcx>) -> &'tcx Goal {
2600 &self.mk_goals(iter::once(goal))[0]
2603 pub fn lint_node<S: Into<MultiSpan>>(self,
2604 lint: &'static Lint,
2608 self.struct_span_lint_node(lint, id, span.into(), msg).emit()
2611 pub fn lint_node_note<S: Into<MultiSpan>>(self,
2612 lint: &'static Lint,
2617 let mut err = self.struct_span_lint_node(lint, id, span.into(), msg);
2622 pub fn lint_level_at_node(self, lint: &'static Lint, mut id: NodeId)
2623 -> (lint::Level, lint::LintSource)
2625 // Right now we insert a `with_ignore` node in the dep graph here to
2626 // ignore the fact that `lint_levels` below depends on the entire crate.
2627 // For now this'll prevent false positives of recompiling too much when
2628 // anything changes.
2630 // Once red/green incremental compilation lands we should be able to
2631 // remove this because while the crate changes often the lint level map
2632 // will change rarely.
2633 self.dep_graph.with_ignore(|| {
2634 let sets = self.lint_levels(LOCAL_CRATE);
2636 let hir_id = self.hir.definitions().node_to_hir_id(id);
2637 if let Some(pair) = sets.level_and_source(lint, hir_id, self.sess) {
2640 let next = self.hir.get_parent_node(id);
2642 bug!("lint traversal reached the root of the crate");
2649 pub fn struct_span_lint_node<S: Into<MultiSpan>>(self,
2650 lint: &'static Lint,
2654 -> DiagnosticBuilder<'tcx>
2656 let (level, src) = self.lint_level_at_node(lint, id);
2657 lint::struct_lint_level(self.sess, lint, level, src, Some(span.into()), msg)
2660 pub fn struct_lint_node(self, lint: &'static Lint, id: NodeId, msg: &str)
2661 -> DiagnosticBuilder<'tcx>
2663 let (level, src) = self.lint_level_at_node(lint, id);
2664 lint::struct_lint_level(self.sess, lint, level, src, None, msg)
2667 pub fn in_scope_traits(self, id: HirId) -> Option<Lrc<StableVec<TraitCandidate>>> {
2668 self.in_scope_traits_map(id.owner)
2669 .and_then(|map| map.get(&id.local_id).cloned())
2672 pub fn named_region(self, id: HirId) -> Option<resolve_lifetime::Region> {
2673 self.named_region_map(id.owner)
2674 .and_then(|map| map.get(&id.local_id).cloned())
2677 pub fn is_late_bound(self, id: HirId) -> bool {
2678 self.is_late_bound_map(id.owner)
2679 .map(|set| set.contains(&id.local_id))
2683 pub fn object_lifetime_defaults(self, id: HirId)
2684 -> Option<Lrc<Vec<ObjectLifetimeDefault>>>
2686 self.object_lifetime_defaults_map(id.owner)
2687 .and_then(|map| map.get(&id.local_id).cloned())
2691 pub trait InternAs<T: ?Sized, R> {
2693 fn intern_with<F>(self, f: F) -> Self::Output
2694 where F: FnOnce(&T) -> R;
2697 impl<I, T, R, E> InternAs<[T], R> for I
2698 where E: InternIteratorElement<T, R>,
2699 I: Iterator<Item=E> {
2700 type Output = E::Output;
2701 fn intern_with<F>(self, f: F) -> Self::Output
2702 where F: FnOnce(&[T]) -> R {
2703 E::intern_with(self, f)
2707 pub trait InternIteratorElement<T, R>: Sized {
2709 fn intern_with<I: Iterator<Item=Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output;
2712 impl<T, R> InternIteratorElement<T, R> for T {
2714 fn intern_with<I: Iterator<Item=Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output {
2715 f(&iter.collect::<AccumulateVec<[_; 8]>>())
2719 impl<'a, T, R> InternIteratorElement<T, R> for &'a T
2723 fn intern_with<I: Iterator<Item=Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output {
2724 f(&iter.cloned().collect::<AccumulateVec<[_; 8]>>())
2728 impl<T, R, E> InternIteratorElement<T, R> for Result<T, E> {
2729 type Output = Result<R, E>;
2730 fn intern_with<I: Iterator<Item=Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output {
2731 Ok(f(&iter.collect::<Result<AccumulateVec<[_; 8]>, _>>()?))
2735 pub fn provide(providers: &mut ty::maps::Providers) {
2736 // FIXME(#44234) - almost all of these queries have no sub-queries and
2737 // therefore no actual inputs, they're just reading tables calculated in
2738 // resolve! Does this work? Unsure! That's what the issue is about
2739 providers.in_scope_traits_map = |tcx, id| tcx.gcx.trait_map.get(&id).cloned();
2740 providers.module_exports = |tcx, id| tcx.gcx.export_map.get(&id).cloned();
2741 providers.crate_name = |tcx, id| {
2742 assert_eq!(id, LOCAL_CRATE);
2745 providers.get_lang_items = |tcx, id| {
2746 assert_eq!(id, LOCAL_CRATE);
2747 // FIXME(#42293) Right now we insert a `with_ignore` node in the dep
2748 // graph here to ignore the fact that `get_lang_items` below depends on
2749 // the entire crate. For now this'll prevent false positives of
2750 // recompiling too much when anything changes.
2752 // Once red/green incremental compilation lands we should be able to
2753 // remove this because while the crate changes often the lint level map
2754 // will change rarely.
2755 tcx.dep_graph.with_ignore(|| Lrc::new(middle::lang_items::collect(tcx)))
2757 providers.freevars = |tcx, id| tcx.gcx.freevars.get(&id).cloned();
2758 providers.maybe_unused_trait_import = |tcx, id| {
2759 tcx.maybe_unused_trait_imports.contains(&id)
2761 providers.maybe_unused_extern_crates = |tcx, cnum| {
2762 assert_eq!(cnum, LOCAL_CRATE);
2763 Lrc::new(tcx.maybe_unused_extern_crates.clone())
2766 providers.stability_index = |tcx, cnum| {
2767 assert_eq!(cnum, LOCAL_CRATE);
2768 Lrc::new(stability::Index::new(tcx))
2770 providers.lookup_stability = |tcx, id| {
2771 assert_eq!(id.krate, LOCAL_CRATE);
2772 let id = tcx.hir.definitions().def_index_to_hir_id(id.index);
2773 tcx.stability().local_stability(id)
2775 providers.lookup_deprecation_entry = |tcx, id| {
2776 assert_eq!(id.krate, LOCAL_CRATE);
2777 let id = tcx.hir.definitions().def_index_to_hir_id(id.index);
2778 tcx.stability().local_deprecation_entry(id)
2780 providers.extern_mod_stmt_cnum = |tcx, id| {
2781 let id = tcx.hir.as_local_node_id(id).unwrap();
2782 tcx.cstore.extern_mod_stmt_cnum_untracked(id)
2784 providers.all_crate_nums = |tcx, cnum| {
2785 assert_eq!(cnum, LOCAL_CRATE);
2786 Lrc::new(tcx.cstore.crates_untracked())
2788 providers.postorder_cnums = |tcx, cnum| {
2789 assert_eq!(cnum, LOCAL_CRATE);
2790 Lrc::new(tcx.cstore.postorder_cnums_untracked())
2792 providers.output_filenames = |tcx, cnum| {
2793 assert_eq!(cnum, LOCAL_CRATE);
2794 tcx.output_filenames.clone()
2796 providers.features_query = |tcx, cnum| {
2797 assert_eq!(cnum, LOCAL_CRATE);
2798 Lrc::new(tcx.sess.features_untracked().clone())
2800 providers.is_panic_runtime = |tcx, cnum| {
2801 assert_eq!(cnum, LOCAL_CRATE);
2802 attr::contains_name(tcx.hir.krate_attrs(), "panic_runtime")
2804 providers.is_compiler_builtins = |tcx, cnum| {
2805 assert_eq!(cnum, LOCAL_CRATE);
2806 attr::contains_name(tcx.hir.krate_attrs(), "compiler_builtins")