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;
19 use hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
20 use hir::map as hir_map;
21 use hir::map::DisambiguatedDefPathData;
22 use middle::free_region::FreeRegionMap;
23 use middle::lang_items;
24 use middle::region::RegionMaps;
25 use middle::resolve_lifetime;
26 use middle::stability;
28 use ty::subst::{Kind, Substs};
31 use ty::{self, TraitRef, Ty, TypeAndMut};
32 use ty::{TyS, TypeVariants, Slice};
33 use ty::{AdtKind, AdtDef, ClosureSubsts, Region};
35 use ty::{PolyFnSig, InferTy, ParamTy, ProjectionTy, ExistentialPredicate};
36 use ty::{TyVar, TyVid, IntVar, IntVid, FloatVar, FloatVid};
37 use ty::TypeVariants::*;
38 use ty::layout::{Layout, TargetDataLayout};
39 use ty::inhabitedness::DefIdForest;
41 use util::nodemap::{NodeMap, NodeSet, DefIdMap, DefIdSet};
42 use util::nodemap::{FxHashMap, FxHashSet};
43 use rustc_data_structures::accumulate_vec::AccumulateVec;
45 use arena::{TypedArena, DroplessArena};
46 use rustc_data_structures::indexed_vec::IndexVec;
47 use std::borrow::Borrow;
48 use std::cell::{Cell, RefCell};
49 use std::hash::{Hash, Hasher};
53 use std::cmp::Ordering;
55 use syntax::ast::{self, Name, NodeId};
57 use syntax::symbol::{Symbol, keywords};
62 pub struct GlobalArenas<'tcx> {
64 layout: TypedArena<Layout>,
67 generics: TypedArena<ty::Generics>,
68 trait_def: TypedArena<ty::TraitDef>,
69 adt_def: TypedArena<ty::AdtDef>,
70 mir: TypedArena<RefCell<Mir<'tcx>>>,
71 tables: TypedArena<ty::TypeckTables<'tcx>>,
74 impl<'tcx> GlobalArenas<'tcx> {
75 pub fn new() -> GlobalArenas<'tcx> {
77 layout: TypedArena::new(),
78 generics: TypedArena::new(),
79 trait_def: TypedArena::new(),
80 adt_def: TypedArena::new(),
81 mir: TypedArena::new(),
82 tables: TypedArena::new(),
87 pub struct CtxtInterners<'tcx> {
88 /// The arena that types, regions, etc are allocated from
89 arena: &'tcx DroplessArena,
91 /// Specifically use a speedy hash algorithm for these hash sets,
92 /// they're accessed quite often.
93 type_: RefCell<FxHashSet<Interned<'tcx, TyS<'tcx>>>>,
94 type_list: RefCell<FxHashSet<Interned<'tcx, Slice<Ty<'tcx>>>>>,
95 substs: RefCell<FxHashSet<Interned<'tcx, Substs<'tcx>>>>,
96 region: RefCell<FxHashSet<Interned<'tcx, Region>>>,
97 existential_predicates: RefCell<FxHashSet<Interned<'tcx, Slice<ExistentialPredicate<'tcx>>>>>,
100 impl<'gcx: 'tcx, 'tcx> CtxtInterners<'tcx> {
101 fn new(arena: &'tcx DroplessArena) -> CtxtInterners<'tcx> {
104 type_: RefCell::new(FxHashSet()),
105 type_list: RefCell::new(FxHashSet()),
106 substs: RefCell::new(FxHashSet()),
107 region: RefCell::new(FxHashSet()),
108 existential_predicates: RefCell::new(FxHashSet()),
112 /// Intern a type. global_interners is Some only if this is
113 /// a local interner and global_interners is its counterpart.
114 fn intern_ty(&self, st: TypeVariants<'tcx>,
115 global_interners: Option<&CtxtInterners<'gcx>>)
118 let mut interner = self.type_.borrow_mut();
119 let global_interner = global_interners.map(|interners| {
120 interners.type_.borrow_mut()
122 if let Some(&Interned(ty)) = interner.get(&st) {
125 if let Some(ref interner) = global_interner {
126 if let Some(&Interned(ty)) = interner.get(&st) {
131 let flags = super::flags::FlagComputation::for_sty(&st);
132 let ty_struct = TyS {
134 flags: Cell::new(flags.flags),
135 region_depth: flags.depth,
138 // HACK(eddyb) Depend on flags being accurate to
139 // determine that all contents are in the global tcx.
140 // See comments on Lift for why we can't use that.
141 if !flags.flags.intersects(ty::TypeFlags::KEEP_IN_LOCAL_TCX) {
142 if let Some(interner) = global_interners {
143 let ty_struct: TyS<'gcx> = unsafe {
144 mem::transmute(ty_struct)
146 let ty: Ty<'gcx> = interner.arena.alloc(ty_struct);
147 global_interner.unwrap().insert(Interned(ty));
151 // Make sure we don't end up with inference
152 // types/regions in the global tcx.
153 if global_interners.is_none() {
155 bug!("Attempted to intern `{:?}` which contains \
156 inference types/regions in the global type context",
161 // Don't be &mut TyS.
162 let ty: Ty<'tcx> = self.arena.alloc(ty_struct);
163 interner.insert(Interned(ty));
167 debug!("Interned type: {:?} Pointer: {:?}",
168 ty, ty as *const TyS);
174 pub struct CommonTypes<'tcx> {
195 #[derive(RustcEncodable, RustcDecodable)]
196 pub struct TypeckTables<'tcx> {
197 /// Resolved definitions for `<T>::X` associated paths.
198 pub type_relative_path_defs: NodeMap<Def>,
200 /// Stores the types for various nodes in the AST. Note that this table
201 /// is not guaranteed to be populated until after typeck. See
202 /// typeck::check::fn_ctxt for details.
203 pub node_types: NodeMap<Ty<'tcx>>,
205 /// Stores the type parameters which were substituted to obtain the type
206 /// of this node. This only applies to nodes that refer to entities
207 /// parameterized by type parameters, such as generic fns, types, or
209 pub item_substs: NodeMap<ty::ItemSubsts<'tcx>>,
211 pub adjustments: NodeMap<ty::adjustment::Adjustment<'tcx>>,
213 pub method_map: ty::MethodMap<'tcx>,
216 pub upvar_capture_map: ty::UpvarCaptureMap<'tcx>,
218 /// Records the type of each closure.
219 pub closure_tys: NodeMap<ty::PolyFnSig<'tcx>>,
221 /// Records the kind of each closure.
222 pub closure_kinds: NodeMap<ty::ClosureKind>,
224 /// For each fn, records the "liberated" types of its arguments
225 /// and return type. Liberated means that all bound regions
226 /// (including late-bound regions) are replaced with free
227 /// equivalents. This table is not used in trans (since regions
228 /// are erased there) and hence is not serialized to metadata.
229 pub liberated_fn_sigs: NodeMap<ty::FnSig<'tcx>>,
231 /// For each FRU expression, record the normalized types of the fields
232 /// of the struct - this is needed because it is non-trivial to
233 /// normalize while preserving regions. This table is used only in
234 /// MIR construction and hence is not serialized to metadata.
235 pub fru_field_types: NodeMap<Vec<Ty<'tcx>>>,
237 /// Maps a cast expression to its kind. This is keyed on the
238 /// *from* expression of the cast, not the cast itself.
239 pub cast_kinds: NodeMap<ty::cast::CastKind>,
241 /// Lints for the body of this fn generated by typeck.
242 pub lints: lint::LintTable,
244 /// Set of trait imports actually used in the method resolution.
245 /// This is used for warning unused imports.
246 pub used_trait_imports: DefIdSet,
248 /// If any errors occurred while type-checking this body,
249 /// this field will be set to `true`.
250 pub tainted_by_errors: bool,
252 /// Stores the free-region relationships that were deduced from
253 /// its where clauses and parameter types. These are then
254 /// read-again by borrowck.
255 pub free_region_map: FreeRegionMap,
258 impl<'tcx> TypeckTables<'tcx> {
259 pub fn empty() -> TypeckTables<'tcx> {
261 type_relative_path_defs: NodeMap(),
262 node_types: FxHashMap(),
263 item_substs: NodeMap(),
264 adjustments: NodeMap(),
265 method_map: FxHashMap(),
266 upvar_capture_map: FxHashMap(),
267 closure_tys: NodeMap(),
268 closure_kinds: NodeMap(),
269 liberated_fn_sigs: NodeMap(),
270 fru_field_types: NodeMap(),
271 cast_kinds: NodeMap(),
272 lints: lint::LintTable::new(),
273 used_trait_imports: DefIdSet(),
274 tainted_by_errors: false,
275 free_region_map: FreeRegionMap::new(),
279 /// Returns the final resolution of a `QPath` in an `Expr` or `Pat` node.
280 pub fn qpath_def(&self, qpath: &hir::QPath, id: NodeId) -> Def {
282 hir::QPath::Resolved(_, ref path) => path.def,
283 hir::QPath::TypeRelative(..) => {
284 self.type_relative_path_defs.get(&id).cloned().unwrap_or(Def::Err)
289 pub fn node_id_to_type(&self, id: NodeId) -> Ty<'tcx> {
290 match self.node_id_to_type_opt(id) {
293 bug!("node_id_to_type: no type for node `{}`",
294 tls::with(|tcx| tcx.hir.node_to_string(id)))
299 pub fn node_id_to_type_opt(&self, id: NodeId) -> Option<Ty<'tcx>> {
300 self.node_types.get(&id).cloned()
303 pub fn node_id_item_substs(&self, id: NodeId) -> Option<&'tcx Substs<'tcx>> {
304 self.item_substs.get(&id).map(|ts| ts.substs)
307 // Returns the type of a pattern as a monotype. Like @expr_ty, this function
308 // doesn't provide type parameter substitutions.
309 pub fn pat_ty(&self, pat: &hir::Pat) -> Ty<'tcx> {
310 self.node_id_to_type(pat.id)
313 pub fn pat_ty_opt(&self, pat: &hir::Pat) -> Option<Ty<'tcx>> {
314 self.node_id_to_type_opt(pat.id)
317 // Returns the type of an expression as a monotype.
319 // NB (1): This is the PRE-ADJUSTMENT TYPE for the expression. That is, in
320 // some cases, we insert `Adjustment` annotations such as auto-deref or
321 // auto-ref. The type returned by this function does not consider such
322 // adjustments. See `expr_ty_adjusted()` instead.
324 // NB (2): This type doesn't provide type parameter substitutions; e.g. if you
325 // ask for the type of "id" in "id(3)", it will return "fn(&isize) -> isize"
326 // instead of "fn(ty) -> T with T = isize".
327 pub fn expr_ty(&self, expr: &hir::Expr) -> Ty<'tcx> {
328 self.node_id_to_type(expr.id)
331 pub fn expr_ty_opt(&self, expr: &hir::Expr) -> Option<Ty<'tcx>> {
332 self.node_id_to_type_opt(expr.id)
335 /// Returns the type of `expr`, considering any `Adjustment`
336 /// entry recorded for that expression.
337 pub fn expr_ty_adjusted(&self, expr: &hir::Expr) -> Ty<'tcx> {
338 self.adjustments.get(&expr.id)
339 .map_or_else(|| self.expr_ty(expr), |adj| adj.target)
342 pub fn expr_ty_adjusted_opt(&self, expr: &hir::Expr) -> Option<Ty<'tcx>> {
343 self.adjustments.get(&expr.id)
344 .map(|adj| adj.target).or_else(|| self.expr_ty_opt(expr))
347 pub fn is_method_call(&self, expr_id: NodeId) -> bool {
348 self.method_map.contains_key(&ty::MethodCall::expr(expr_id))
351 pub fn is_overloaded_autoderef(&self, expr_id: NodeId, autoderefs: u32) -> bool {
352 self.method_map.contains_key(&ty::MethodCall::autoderef(expr_id, autoderefs))
355 pub fn upvar_capture(&self, upvar_id: ty::UpvarId) -> Option<ty::UpvarCapture<'tcx>> {
356 Some(self.upvar_capture_map.get(&upvar_id).unwrap().clone())
360 impl<'tcx> CommonTypes<'tcx> {
361 fn new(interners: &CtxtInterners<'tcx>) -> CommonTypes<'tcx> {
362 let mk = |sty| interners.intern_ty(sty, None);
368 isize: mk(TyInt(ast::IntTy::Is)),
369 i8: mk(TyInt(ast::IntTy::I8)),
370 i16: mk(TyInt(ast::IntTy::I16)),
371 i32: mk(TyInt(ast::IntTy::I32)),
372 i64: mk(TyInt(ast::IntTy::I64)),
373 i128: mk(TyInt(ast::IntTy::I128)),
374 usize: mk(TyUint(ast::UintTy::Us)),
375 u8: mk(TyUint(ast::UintTy::U8)),
376 u16: mk(TyUint(ast::UintTy::U16)),
377 u32: mk(TyUint(ast::UintTy::U32)),
378 u64: mk(TyUint(ast::UintTy::U64)),
379 u128: mk(TyUint(ast::UintTy::U128)),
380 f32: mk(TyFloat(ast::FloatTy::F32)),
381 f64: mk(TyFloat(ast::FloatTy::F64)),
386 /// The data structure to keep track of all the information that typechecker
387 /// generates so that so that it can be reused and doesn't have to be redone
389 #[derive(Copy, Clone)]
390 pub struct TyCtxt<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
391 gcx: &'a GlobalCtxt<'gcx>,
392 interners: &'a CtxtInterners<'tcx>
395 impl<'a, 'gcx, 'tcx> Deref for TyCtxt<'a, 'gcx, 'tcx> {
396 type Target = &'a GlobalCtxt<'gcx>;
397 fn deref(&self) -> &Self::Target {
402 pub struct GlobalCtxt<'tcx> {
403 global_arenas: &'tcx GlobalArenas<'tcx>,
404 global_interners: CtxtInterners<'tcx>,
406 pub sess: &'tcx Session,
408 pub specializes_cache: RefCell<traits::SpecializesCache>,
410 pub dep_graph: DepGraph,
412 /// Common types, pre-interned for your convenience.
413 pub types: CommonTypes<'tcx>,
415 /// Map indicating what traits are in scope for places where this
416 /// is relevant; generated by resolve.
417 pub trait_map: TraitMap,
419 pub named_region_map: resolve_lifetime::NamedRegionMap,
421 pub region_maps: RegionMaps,
423 pub hir: hir_map::Map<'tcx>,
424 pub maps: maps::Maps<'tcx>,
426 // Records the free variables refrenced by every closure
427 // expression. Do not track deps for this, just recompute it from
428 // scratch every time.
429 pub freevars: RefCell<FreevarMap>,
431 pub maybe_unused_trait_imports: NodeSet,
433 // Internal cache for metadata decoding. No need to track deps on this.
434 pub rcache: RefCell<FxHashMap<ty::CReaderCacheKey, Ty<'tcx>>>,
436 // Cache for the type-contents routine. FIXME -- track deps?
437 pub tc_cache: RefCell<FxHashMap<Ty<'tcx>, ty::contents::TypeContents>>,
439 // FIXME dep tracking -- should be harmless enough
440 pub normalized_cache: RefCell<FxHashMap<Ty<'tcx>, Ty<'tcx>>>,
442 pub inhabitedness_cache: RefCell<FxHashMap<Ty<'tcx>, DefIdForest>>,
444 pub lang_items: middle::lang_items::LanguageItems,
446 /// True if the variance has been computed yet; false otherwise.
447 pub variance_computed: Cell<bool>,
449 /// Set of used unsafe nodes (functions or blocks). Unsafe nodes not
450 /// present in this set can be warned about.
451 pub used_unsafe: RefCell<NodeSet>,
453 /// Set of nodes which mark locals as mutable which end up getting used at
454 /// some point. Local variable definitions not in this set can be warned
456 pub used_mut_nodes: RefCell<NodeSet>,
458 /// The set of external nominal types whose implementations have been read.
459 /// This is used for lazy resolution of methods.
460 pub populated_external_types: RefCell<DefIdSet>,
462 /// The set of external primitive types whose implementations have been read.
463 /// FIXME(arielb1): why is this separate from populated_external_types?
464 pub populated_external_primitive_impls: RefCell<DefIdSet>,
466 /// Maps any item's def-id to its stability index.
467 pub stability: RefCell<stability::Index<'tcx>>,
469 /// Caches the results of trait selection. This cache is used
470 /// for things that do not have to do with the parameters in scope.
471 pub selection_cache: traits::SelectionCache<'tcx>,
473 /// Caches the results of trait evaluation. This cache is used
474 /// for things that do not have to do with the parameters in scope.
475 /// Merge this with `selection_cache`?
476 pub evaluation_cache: traits::EvaluationCache<'tcx>,
478 /// A set of predicates that have been fulfilled *somewhere*.
479 /// This is used to avoid duplicate work. Predicates are only
480 /// added to this set when they mention only "global" names
481 /// (i.e., no type or lifetime parameters).
482 pub fulfilled_predicates: RefCell<traits::GlobalFulfilledPredicates<'tcx>>,
484 /// Maps Expr NodeId's to `true` iff `&expr` can have 'static lifetime.
485 pub rvalue_promotable_to_static: RefCell<NodeMap<bool>>,
487 /// Maps Fn items to a collection of fragment infos.
489 /// The main goal is to identify data (each of which may be moved
490 /// or assigned) whose subparts are not moved nor assigned
491 /// (i.e. their state is *unfragmented*) and corresponding ast
492 /// nodes where the path to that data is moved or assigned.
494 /// In the long term, unfragmented values will have their
495 /// destructor entirely driven by a single stack-local drop-flag,
496 /// and their parents, the collections of the unfragmented values
497 /// (or more simply, "fragmented values"), are mapped to the
498 /// corresponding collections of stack-local drop-flags.
500 /// (However, in the short term that is not the case; e.g. some
501 /// unfragmented paths still need to be zeroed, namely when they
502 /// reference parent data from an outer scope that was not
503 /// entirely moved, and therefore that needs to be zeroed so that
504 /// we do not get double-drop when we hit the end of the parent
507 /// Also: currently the table solely holds keys for node-ids of
508 /// unfragmented values (see `FragmentInfo` enum definition), but
509 /// longer-term we will need to also store mappings from
510 /// fragmented data to the set of unfragmented pieces that
512 pub fragment_infos: RefCell<DefIdMap<Vec<ty::FragmentInfo>>>,
514 /// The definite name of the current crate after taking into account
515 /// attributes, commandline parameters, etc.
516 pub crate_name: Symbol,
518 /// Data layout specification for the current target.
519 pub data_layout: TargetDataLayout,
521 /// Cache for layouts computed from types.
522 pub layout_cache: RefCell<FxHashMap<Ty<'tcx>, &'tcx Layout>>,
524 /// Used to prevent layout from recursing too deeply.
525 pub layout_depth: Cell<usize>,
527 /// Map from function to the `#[derive]` mode that it's defining. Only used
528 /// by `proc-macro` crates.
529 pub derive_macros: RefCell<NodeMap<Symbol>>,
531 stability_interner: RefCell<FxHashSet<&'tcx attr::Stability>>,
533 layout_interner: RefCell<FxHashSet<&'tcx Layout>>,
535 /// A vector of every trait accessible in the whole crate
536 /// (i.e. including those from subcrates). This is used only for
537 /// error reporting, and so is lazily initialised and generally
538 /// shouldn't taint the common path (hence the RefCell).
539 pub all_traits: RefCell<Option<Vec<DefId>>>,
541 /// HIR Ty -> Ty lowering cache.
542 pub ast_ty_to_ty_cache: RefCell<NodeMap<Ty<'tcx>>>,
545 impl<'tcx> GlobalCtxt<'tcx> {
546 /// Get the global TyCtxt.
547 pub fn global_tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx> {
550 interners: &self.global_interners
555 impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
556 pub fn crate_name(self, cnum: CrateNum) -> Symbol {
557 if cnum == LOCAL_CRATE {
560 self.sess.cstore.crate_name(cnum)
564 pub fn original_crate_name(self, cnum: CrateNum) -> Symbol {
565 if cnum == LOCAL_CRATE {
566 self.crate_name.clone()
568 self.sess.cstore.original_crate_name(cnum)
572 pub fn crate_disambiguator(self, cnum: CrateNum) -> Symbol {
573 if cnum == LOCAL_CRATE {
574 self.sess.local_crate_disambiguator()
576 self.sess.cstore.crate_disambiguator(cnum)
580 pub fn retrace_path(self,
582 path_data: &[DisambiguatedDefPathData])
584 debug!("retrace_path(path={:?}, krate={:?})", path_data, self.crate_name(krate));
586 if krate == LOCAL_CRATE {
590 .retrace_path(path_data)
591 .map(|def_index| DefId { krate: krate, index: def_index })
593 self.sess.cstore.retrace_path(krate, path_data)
597 pub fn alloc_generics(self, generics: ty::Generics) -> &'gcx ty::Generics {
598 self.global_arenas.generics.alloc(generics)
601 pub fn alloc_mir(self, mir: Mir<'gcx>) -> &'gcx RefCell<Mir<'gcx>> {
602 self.global_arenas.mir.alloc(RefCell::new(mir))
605 pub fn alloc_tables(self, tables: ty::TypeckTables<'gcx>) -> &'gcx ty::TypeckTables<'gcx> {
606 self.global_arenas.tables.alloc(tables)
609 pub fn alloc_trait_def(self, def: ty::TraitDef) -> &'gcx ty::TraitDef {
610 self.global_arenas.trait_def.alloc(def)
613 pub fn alloc_adt_def(self,
616 variants: Vec<ty::VariantDef>,
618 -> &'gcx ty::AdtDef {
619 let def = ty::AdtDef::new(self, did, kind, variants, repr);
620 self.global_arenas.adt_def.alloc(def)
623 pub fn intern_stability(self, stab: attr::Stability) -> &'gcx attr::Stability {
624 if let Some(st) = self.stability_interner.borrow().get(&stab) {
628 let interned = self.global_interners.arena.alloc(stab);
629 if let Some(prev) = self.stability_interner.borrow_mut().replace(interned) {
630 bug!("Tried to overwrite interned Stability: {:?}", prev)
635 pub fn intern_layout(self, layout: Layout) -> &'gcx Layout {
636 if let Some(layout) = self.layout_interner.borrow().get(&layout) {
640 let interned = self.global_arenas.layout.alloc(layout);
641 if let Some(prev) = self.layout_interner.borrow_mut().replace(interned) {
642 bug!("Tried to overwrite interned Layout: {:?}", prev)
647 pub fn lift<T: ?Sized + Lift<'tcx>>(self, value: &T) -> Option<T::Lifted> {
648 value.lift_to_tcx(self)
651 /// Like lift, but only tries in the global tcx.
652 pub fn lift_to_global<T: ?Sized + Lift<'gcx>>(self, value: &T) -> Option<T::Lifted> {
653 value.lift_to_tcx(self.global_tcx())
656 /// Returns true if self is the same as self.global_tcx().
657 fn is_global(self) -> bool {
658 let local = self.interners as *const _;
659 let global = &self.global_interners as *const _;
660 local as usize == global as usize
663 /// Create a type context and call the closure with a `TyCtxt` reference
664 /// to the context. The closure enforces that the type context and any interned
665 /// value (types, substs, etc.) can only be used while `ty::tls` has a valid
666 /// reference to the context, to allow formatting values that need it.
667 pub fn create_and_enter<F, R>(s: &'tcx Session,
668 local_providers: ty::maps::Providers<'tcx>,
669 extern_providers: ty::maps::Providers<'tcx>,
670 arenas: &'tcx GlobalArenas<'tcx>,
671 arena: &'tcx DroplessArena,
672 resolutions: ty::Resolutions,
673 named_region_map: resolve_lifetime::NamedRegionMap,
674 hir: hir_map::Map<'tcx>,
675 region_maps: RegionMaps,
676 lang_items: middle::lang_items::LanguageItems,
677 stability: stability::Index<'tcx>,
680 where F: for<'b> FnOnce(TyCtxt<'b, 'tcx, 'tcx>) -> R
682 let data_layout = TargetDataLayout::parse(s);
683 let interners = CtxtInterners::new(arena);
684 let common_types = CommonTypes::new(&interners);
685 let dep_graph = hir.dep_graph.clone();
686 let fulfilled_predicates = traits::GlobalFulfilledPredicates::new(dep_graph.clone());
687 let max_cnum = s.cstore.crates().iter().map(|c| c.as_usize()).max().unwrap_or(0);
688 let mut providers = IndexVec::from_elem_n(extern_providers, max_cnum + 1);
689 providers[LOCAL_CRATE] = local_providers;
690 tls::enter_global(GlobalCtxt {
692 specializes_cache: RefCell::new(traits::SpecializesCache::new()),
693 global_arenas: arenas,
694 global_interners: interners,
695 dep_graph: dep_graph.clone(),
697 named_region_map: named_region_map,
698 region_maps: region_maps,
699 variance_computed: Cell::new(false),
700 trait_map: resolutions.trait_map,
701 fulfilled_predicates: RefCell::new(fulfilled_predicates),
703 maps: maps::Maps::new(dep_graph, providers),
704 freevars: RefCell::new(resolutions.freevars),
705 maybe_unused_trait_imports: resolutions.maybe_unused_trait_imports,
706 rcache: RefCell::new(FxHashMap()),
707 tc_cache: RefCell::new(FxHashMap()),
708 normalized_cache: RefCell::new(FxHashMap()),
709 inhabitedness_cache: RefCell::new(FxHashMap()),
710 lang_items: lang_items,
711 used_unsafe: RefCell::new(NodeSet()),
712 used_mut_nodes: RefCell::new(NodeSet()),
713 populated_external_types: RefCell::new(DefIdSet()),
714 populated_external_primitive_impls: RefCell::new(DefIdSet()),
715 stability: RefCell::new(stability),
716 selection_cache: traits::SelectionCache::new(),
717 evaluation_cache: traits::EvaluationCache::new(),
718 rvalue_promotable_to_static: RefCell::new(NodeMap()),
719 fragment_infos: RefCell::new(DefIdMap()),
720 crate_name: Symbol::intern(crate_name),
721 data_layout: data_layout,
722 layout_cache: RefCell::new(FxHashMap()),
723 layout_interner: RefCell::new(FxHashSet()),
724 layout_depth: Cell::new(0),
725 derive_macros: RefCell::new(NodeMap()),
726 stability_interner: RefCell::new(FxHashSet()),
727 all_traits: RefCell::new(None),
728 ast_ty_to_ty_cache: RefCell::new(NodeMap()),
733 impl<'gcx: 'tcx, 'tcx> GlobalCtxt<'gcx> {
734 /// Call the closure with a local `TyCtxt` using the given arena.
735 pub fn enter_local<F, R>(&self, arena: &'tcx DroplessArena, f: F) -> R
736 where F: for<'a> FnOnce(TyCtxt<'a, 'gcx, 'tcx>) -> R
738 let interners = CtxtInterners::new(arena);
739 tls::enter(self, &interners, f)
743 /// A trait implemented for all X<'a> types which can be safely and
744 /// efficiently converted to X<'tcx> as long as they are part of the
745 /// provided TyCtxt<'tcx>.
746 /// This can be done, for example, for Ty<'tcx> or &'tcx Substs<'tcx>
747 /// by looking them up in their respective interners.
749 /// However, this is still not the best implementation as it does
750 /// need to compare the components, even for interned values.
751 /// It would be more efficient if TypedArena provided a way to
752 /// determine whether the address is in the allocated range.
754 /// None is returned if the value or one of the components is not part
755 /// of the provided context.
756 /// For Ty, None can be returned if either the type interner doesn't
757 /// contain the TypeVariants key or if the address of the interned
758 /// pointer differs. The latter case is possible if a primitive type,
759 /// e.g. `()` or `u8`, was interned in a different context.
760 pub trait Lift<'tcx> {
762 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted>;
765 impl<'a, 'tcx> Lift<'tcx> for Ty<'a> {
766 type Lifted = Ty<'tcx>;
767 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Ty<'tcx>> {
768 if tcx.interners.arena.in_arena(*self as *const _) {
769 return Some(unsafe { mem::transmute(*self) });
771 // Also try in the global tcx if we're not that.
772 if !tcx.is_global() {
773 self.lift_to_tcx(tcx.global_tcx())
780 impl<'a, 'tcx> Lift<'tcx> for &'a Substs<'a> {
781 type Lifted = &'tcx Substs<'tcx>;
782 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<&'tcx Substs<'tcx>> {
784 return Some(Slice::empty());
786 if tcx.interners.arena.in_arena(&self[..] as *const _) {
787 return Some(unsafe { mem::transmute(*self) });
789 // Also try in the global tcx if we're not that.
790 if !tcx.is_global() {
791 self.lift_to_tcx(tcx.global_tcx())
798 impl<'a, 'tcx> Lift<'tcx> for &'a Region {
799 type Lifted = &'tcx Region;
800 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<&'tcx Region> {
801 if tcx.interners.arena.in_arena(*self as *const _) {
802 return Some(unsafe { mem::transmute(*self) });
804 // Also try in the global tcx if we're not that.
805 if !tcx.is_global() {
806 self.lift_to_tcx(tcx.global_tcx())
813 impl<'a, 'tcx> Lift<'tcx> for &'a Slice<Ty<'a>> {
814 type Lifted = &'tcx Slice<Ty<'tcx>>;
815 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
816 -> Option<&'tcx Slice<Ty<'tcx>>> {
818 return Some(Slice::empty());
820 if tcx.interners.arena.in_arena(*self as *const _) {
821 return Some(unsafe { mem::transmute(*self) });
823 // Also try in the global tcx if we're not that.
824 if !tcx.is_global() {
825 self.lift_to_tcx(tcx.global_tcx())
832 impl<'a, 'tcx> Lift<'tcx> for &'a Slice<ExistentialPredicate<'a>> {
833 type Lifted = &'tcx Slice<ExistentialPredicate<'tcx>>;
834 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
835 -> Option<&'tcx Slice<ExistentialPredicate<'tcx>>> {
837 return Some(Slice::empty());
839 if tcx.interners.arena.in_arena(*self as *const _) {
840 return Some(unsafe { mem::transmute(*self) });
842 // Also try in the global tcx if we're not that.
843 if !tcx.is_global() {
844 self.lift_to_tcx(tcx.global_tcx())
852 use super::{CtxtInterners, GlobalCtxt, TyCtxt};
858 /// Marker types used for the scoped TLS slot.
859 /// The type context cannot be used directly because the scoped TLS
860 /// in libstd doesn't allow types generic over lifetimes.
861 enum ThreadLocalGlobalCtxt {}
862 enum ThreadLocalInterners {}
865 static TLS_TCX: Cell<Option<(*const ThreadLocalGlobalCtxt,
866 *const ThreadLocalInterners)>> = Cell::new(None)
869 fn span_debug(span: syntax_pos::Span, f: &mut fmt::Formatter) -> fmt::Result {
871 write!(f, "{}", tcx.sess.codemap().span_to_string(span))
875 pub fn enter_global<'gcx, F, R>(gcx: GlobalCtxt<'gcx>, f: F) -> R
876 where F: for<'a> FnOnce(TyCtxt<'a, 'gcx, 'gcx>) -> R
878 syntax_pos::SPAN_DEBUG.with(|span_dbg| {
879 let original_span_debug = span_dbg.get();
880 span_dbg.set(span_debug);
881 let result = enter(&gcx, &gcx.global_interners, f);
882 span_dbg.set(original_span_debug);
887 pub fn enter<'a, 'gcx: 'tcx, 'tcx, F, R>(gcx: &'a GlobalCtxt<'gcx>,
888 interners: &'a CtxtInterners<'tcx>,
890 where F: FnOnce(TyCtxt<'a, 'gcx, 'tcx>) -> R
892 let gcx_ptr = gcx as *const _ as *const ThreadLocalGlobalCtxt;
893 let interners_ptr = interners as *const _ as *const ThreadLocalInterners;
895 let prev = tls.get();
896 tls.set(Some((gcx_ptr, interners_ptr)));
906 pub fn with<F, R>(f: F) -> R
907 where F: for<'a, 'gcx, 'tcx> FnOnce(TyCtxt<'a, 'gcx, 'tcx>) -> R
910 let (gcx, interners) = tcx.get().unwrap();
911 let gcx = unsafe { &*(gcx as *const GlobalCtxt) };
912 let interners = unsafe { &*(interners as *const CtxtInterners) };
920 pub fn with_opt<F, R>(f: F) -> R
921 where F: for<'a, 'gcx, 'tcx> FnOnce(Option<TyCtxt<'a, 'gcx, 'tcx>>) -> R
923 if TLS_TCX.with(|tcx| tcx.get().is_some()) {
931 macro_rules! sty_debug_print {
932 ($ctxt: expr, $($variant: ident),*) => {{
933 // curious inner module to allow variant names to be used as
935 #[allow(non_snake_case)]
937 use ty::{self, TyCtxt};
938 use ty::context::Interned;
940 #[derive(Copy, Clone)]
948 pub fn go(tcx: TyCtxt) {
949 let mut total = DebugStat {
951 region_infer: 0, ty_infer: 0, both_infer: 0,
953 $(let mut $variant = total;)*
956 for &Interned(t) in tcx.interners.type_.borrow().iter() {
957 let variant = match t.sty {
958 ty::TyBool | ty::TyChar | ty::TyInt(..) | ty::TyUint(..) |
959 ty::TyFloat(..) | ty::TyStr | ty::TyNever => continue,
960 ty::TyError => /* unimportant */ continue,
961 $(ty::$variant(..) => &mut $variant,)*
963 let region = t.flags.get().intersects(ty::TypeFlags::HAS_RE_INFER);
964 let ty = t.flags.get().intersects(ty::TypeFlags::HAS_TY_INFER);
968 if region { total.region_infer += 1; variant.region_infer += 1 }
969 if ty { total.ty_infer += 1; variant.ty_infer += 1 }
970 if region && ty { total.both_infer += 1; variant.both_infer += 1 }
972 println!("Ty interner total ty region both");
973 $(println!(" {:18}: {uses:6} {usespc:4.1}%, \
974 {ty:4.1}% {region:5.1}% {both:4.1}%",
975 stringify!($variant),
976 uses = $variant.total,
977 usespc = $variant.total as f64 * 100.0 / total.total as f64,
978 ty = $variant.ty_infer as f64 * 100.0 / total.total as f64,
979 region = $variant.region_infer as f64 * 100.0 / total.total as f64,
980 both = $variant.both_infer as f64 * 100.0 / total.total as f64);
982 println!(" total {uses:6} \
983 {ty:4.1}% {region:5.1}% {both:4.1}%",
985 ty = total.ty_infer as f64 * 100.0 / total.total as f64,
986 region = total.region_infer as f64 * 100.0 / total.total as f64,
987 both = total.both_infer as f64 * 100.0 / total.total as f64)
995 impl<'a, 'tcx> TyCtxt<'a, 'tcx, 'tcx> {
996 pub fn print_debug_stats(self) {
999 TyAdt, TyArray, TySlice, TyRawPtr, TyRef, TyFnDef, TyFnPtr,
1000 TyDynamic, TyClosure, TyTuple, TyParam, TyInfer, TyProjection, TyAnon);
1002 println!("Substs interner: #{}", self.interners.substs.borrow().len());
1003 println!("Region interner: #{}", self.interners.region.borrow().len());
1004 println!("Stability interner: #{}", self.stability_interner.borrow().len());
1005 println!("Layout interner: #{}", self.layout_interner.borrow().len());
1010 /// An entry in an interner.
1011 struct Interned<'tcx, T: 'tcx+?Sized>(&'tcx T);
1013 // NB: An Interned<Ty> compares and hashes as a sty.
1014 impl<'tcx> PartialEq for Interned<'tcx, TyS<'tcx>> {
1015 fn eq(&self, other: &Interned<'tcx, TyS<'tcx>>) -> bool {
1016 self.0.sty == other.0.sty
1020 impl<'tcx> Eq for Interned<'tcx, TyS<'tcx>> {}
1022 impl<'tcx> Hash for Interned<'tcx, TyS<'tcx>> {
1023 fn hash<H: Hasher>(&self, s: &mut H) {
1028 impl<'tcx: 'lcx, 'lcx> Borrow<TypeVariants<'lcx>> for Interned<'tcx, TyS<'tcx>> {
1029 fn borrow<'a>(&'a self) -> &'a TypeVariants<'lcx> {
1034 // NB: An Interned<Slice<T>> compares and hashes as its elements.
1035 impl<'tcx, T: PartialEq> PartialEq for Interned<'tcx, Slice<T>> {
1036 fn eq(&self, other: &Interned<'tcx, Slice<T>>) -> bool {
1037 self.0[..] == other.0[..]
1041 impl<'tcx, T: Eq> Eq for Interned<'tcx, Slice<T>> {}
1043 impl<'tcx, T: Hash> Hash for Interned<'tcx, Slice<T>> {
1044 fn hash<H: Hasher>(&self, s: &mut H) {
1049 impl<'tcx: 'lcx, 'lcx> Borrow<[Ty<'lcx>]> for Interned<'tcx, Slice<Ty<'tcx>>> {
1050 fn borrow<'a>(&'a self) -> &'a [Ty<'lcx>] {
1055 impl<'tcx: 'lcx, 'lcx> Borrow<[Kind<'lcx>]> for Interned<'tcx, Substs<'tcx>> {
1056 fn borrow<'a>(&'a self) -> &'a [Kind<'lcx>] {
1061 impl<'tcx> Borrow<Region> for Interned<'tcx, Region> {
1062 fn borrow<'a>(&'a self) -> &'a Region {
1067 impl<'tcx: 'lcx, 'lcx> Borrow<[ExistentialPredicate<'lcx>]>
1068 for Interned<'tcx, Slice<ExistentialPredicate<'tcx>>> {
1069 fn borrow<'a>(&'a self) -> &'a [ExistentialPredicate<'lcx>] {
1074 macro_rules! intern_method {
1075 ($lt_tcx:tt, $name:ident: $method:ident($alloc:ty,
1076 $alloc_method:ident,
1079 $needs_infer:expr) -> $ty:ty) => {
1080 impl<'a, 'gcx, $lt_tcx> TyCtxt<'a, 'gcx, $lt_tcx> {
1081 pub fn $method(self, v: $alloc) -> &$lt_tcx $ty {
1083 let key = ($alloc_to_key)(&v);
1084 if let Some(i) = self.interners.$name.borrow().get(key) {
1087 if !self.is_global() {
1088 if let Some(i) = self.global_interners.$name.borrow().get(key) {
1094 // HACK(eddyb) Depend on flags being accurate to
1095 // determine that all contents are in the global tcx.
1096 // See comments on Lift for why we can't use that.
1097 if !($needs_infer)(&v) {
1098 if !self.is_global() {
1102 let i = ($alloc_to_ret)(self.global_interners.arena.$alloc_method(v));
1103 self.global_interners.$name.borrow_mut().insert(Interned(i));
1107 // Make sure we don't end up with inference
1108 // types/regions in the global tcx.
1109 if self.is_global() {
1110 bug!("Attempted to intern `{:?}` which contains \
1111 inference types/regions in the global type context",
1116 let i = ($alloc_to_ret)(self.interners.arena.$alloc_method(v));
1117 self.interners.$name.borrow_mut().insert(Interned(i));
1124 macro_rules! direct_interners {
1125 ($lt_tcx:tt, $($name:ident: $method:ident($needs_infer:expr) -> $ty:ty),+) => {
1126 $(impl<$lt_tcx> PartialEq for Interned<$lt_tcx, $ty> {
1127 fn eq(&self, other: &Self) -> bool {
1132 impl<$lt_tcx> Eq for Interned<$lt_tcx, $ty> {}
1134 impl<$lt_tcx> Hash for Interned<$lt_tcx, $ty> {
1135 fn hash<H: Hasher>(&self, s: &mut H) {
1140 intern_method!($lt_tcx, $name: $method($ty, alloc, |x| x, |x| x, $needs_infer) -> $ty);)+
1144 fn keep_local<'tcx, T: ty::TypeFoldable<'tcx>>(x: &T) -> bool {
1145 x.has_type_flags(ty::TypeFlags::KEEP_IN_LOCAL_TCX)
1148 direct_interners!('tcx,
1149 region: mk_region(|r| {
1151 &ty::ReVar(_) | &ty::ReSkolemized(..) => true,
1157 macro_rules! slice_interners {
1158 ($($field:ident: $method:ident($ty:ident)),+) => (
1159 $(intern_method!('tcx, $field: $method(&[$ty<'tcx>], alloc_slice, Deref::deref,
1160 |xs: &[$ty]| -> &Slice<$ty> {
1161 unsafe { mem::transmute(xs) }
1162 }, |xs: &[$ty]| xs.iter().any(keep_local)) -> Slice<$ty<'tcx>>);)+
1167 existential_predicates: _intern_existential_predicates(ExistentialPredicate),
1168 type_list: _intern_type_list(Ty),
1169 substs: _intern_substs(Kind)
1172 impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
1173 /// Create an unsafe fn ty based on a safe fn ty.
1174 pub fn safe_to_unsafe_fn_ty(self, sig: PolyFnSig<'tcx>) -> Ty<'tcx> {
1175 assert_eq!(sig.unsafety(), hir::Unsafety::Normal);
1176 self.mk_fn_ptr(sig.map_bound(|sig| ty::FnSig {
1177 unsafety: hir::Unsafety::Unsafe,
1182 // Interns a type/name combination, stores the resulting box in cx.interners,
1183 // and returns the box as cast to an unsafe ptr (see comments for Ty above).
1184 pub fn mk_ty(self, st: TypeVariants<'tcx>) -> Ty<'tcx> {
1185 let global_interners = if !self.is_global() {
1186 Some(&self.global_interners)
1190 self.interners.intern_ty(st, global_interners)
1193 pub fn mk_mach_int(self, tm: ast::IntTy) -> Ty<'tcx> {
1195 ast::IntTy::Is => self.types.isize,
1196 ast::IntTy::I8 => self.types.i8,
1197 ast::IntTy::I16 => self.types.i16,
1198 ast::IntTy::I32 => self.types.i32,
1199 ast::IntTy::I64 => self.types.i64,
1200 ast::IntTy::I128 => self.types.i128,
1204 pub fn mk_mach_uint(self, tm: ast::UintTy) -> Ty<'tcx> {
1206 ast::UintTy::Us => self.types.usize,
1207 ast::UintTy::U8 => self.types.u8,
1208 ast::UintTy::U16 => self.types.u16,
1209 ast::UintTy::U32 => self.types.u32,
1210 ast::UintTy::U64 => self.types.u64,
1211 ast::UintTy::U128 => self.types.u128,
1215 pub fn mk_mach_float(self, tm: ast::FloatTy) -> Ty<'tcx> {
1217 ast::FloatTy::F32 => self.types.f32,
1218 ast::FloatTy::F64 => self.types.f64,
1222 pub fn mk_str(self) -> Ty<'tcx> {
1226 pub fn mk_static_str(self) -> Ty<'tcx> {
1227 self.mk_imm_ref(self.mk_region(ty::ReStatic), self.mk_str())
1230 pub fn mk_adt(self, def: &'tcx AdtDef, substs: &'tcx Substs<'tcx>) -> Ty<'tcx> {
1231 // take a copy of substs so that we own the vectors inside
1232 self.mk_ty(TyAdt(def, substs))
1235 pub fn mk_box(self, ty: Ty<'tcx>) -> Ty<'tcx> {
1236 let def_id = self.require_lang_item(lang_items::OwnedBoxLangItem);
1237 let adt_def = self.lookup_adt_def(def_id);
1238 let substs = self.mk_substs(iter::once(Kind::from(ty)));
1239 self.mk_ty(TyAdt(adt_def, substs))
1242 pub fn mk_ptr(self, tm: TypeAndMut<'tcx>) -> Ty<'tcx> {
1243 self.mk_ty(TyRawPtr(tm))
1246 pub fn mk_ref(self, r: &'tcx Region, tm: TypeAndMut<'tcx>) -> Ty<'tcx> {
1247 self.mk_ty(TyRef(r, tm))
1250 pub fn mk_mut_ref(self, r: &'tcx Region, ty: Ty<'tcx>) -> Ty<'tcx> {
1251 self.mk_ref(r, TypeAndMut {ty: ty, mutbl: hir::MutMutable})
1254 pub fn mk_imm_ref(self, r: &'tcx Region, ty: Ty<'tcx>) -> Ty<'tcx> {
1255 self.mk_ref(r, TypeAndMut {ty: ty, mutbl: hir::MutImmutable})
1258 pub fn mk_mut_ptr(self, ty: Ty<'tcx>) -> Ty<'tcx> {
1259 self.mk_ptr(TypeAndMut {ty: ty, mutbl: hir::MutMutable})
1262 pub fn mk_imm_ptr(self, ty: Ty<'tcx>) -> Ty<'tcx> {
1263 self.mk_ptr(TypeAndMut {ty: ty, mutbl: hir::MutImmutable})
1266 pub fn mk_nil_ptr(self) -> Ty<'tcx> {
1267 self.mk_imm_ptr(self.mk_nil())
1270 pub fn mk_array(self, ty: Ty<'tcx>, n: usize) -> Ty<'tcx> {
1271 self.mk_ty(TyArray(ty, n))
1274 pub fn mk_slice(self, ty: Ty<'tcx>) -> Ty<'tcx> {
1275 self.mk_ty(TySlice(ty))
1278 pub fn intern_tup(self, ts: &[Ty<'tcx>], defaulted: bool) -> Ty<'tcx> {
1279 self.mk_ty(TyTuple(self.intern_type_list(ts), defaulted))
1282 pub fn mk_tup<I: InternAs<[Ty<'tcx>], Ty<'tcx>>>(self, iter: I,
1283 defaulted: bool) -> I::Output {
1284 iter.intern_with(|ts| self.mk_ty(TyTuple(self.intern_type_list(ts), defaulted)))
1287 pub fn mk_nil(self) -> Ty<'tcx> {
1288 self.intern_tup(&[], false)
1291 pub fn mk_diverging_default(self) -> Ty<'tcx> {
1292 if self.sess.features.borrow().never_type {
1295 self.intern_tup(&[], true)
1299 pub fn mk_bool(self) -> Ty<'tcx> {
1303 pub fn mk_fn_def(self, def_id: DefId,
1304 substs: &'tcx Substs<'tcx>,
1305 fty: PolyFnSig<'tcx>) -> Ty<'tcx> {
1306 self.mk_ty(TyFnDef(def_id, substs, fty))
1309 pub fn mk_fn_ptr(self, fty: PolyFnSig<'tcx>) -> Ty<'tcx> {
1310 self.mk_ty(TyFnPtr(fty))
1315 obj: ty::Binder<&'tcx Slice<ExistentialPredicate<'tcx>>>,
1316 reg: &'tcx ty::Region
1318 self.mk_ty(TyDynamic(obj, reg))
1321 pub fn mk_projection(self,
1322 trait_ref: TraitRef<'tcx>,
1325 // take a copy of substs so that we own the vectors inside
1326 let inner = ProjectionTy { trait_ref: trait_ref, item_name: item_name };
1327 self.mk_ty(TyProjection(inner))
1330 pub fn mk_closure(self,
1332 substs: &'tcx Substs<'tcx>)
1334 self.mk_closure_from_closure_substs(closure_id, ClosureSubsts {
1339 pub fn mk_closure_from_closure_substs(self,
1341 closure_substs: ClosureSubsts<'tcx>)
1343 self.mk_ty(TyClosure(closure_id, closure_substs))
1346 pub fn mk_var(self, v: TyVid) -> Ty<'tcx> {
1347 self.mk_infer(TyVar(v))
1350 pub fn mk_int_var(self, v: IntVid) -> Ty<'tcx> {
1351 self.mk_infer(IntVar(v))
1354 pub fn mk_float_var(self, v: FloatVid) -> Ty<'tcx> {
1355 self.mk_infer(FloatVar(v))
1358 pub fn mk_infer(self, it: InferTy) -> Ty<'tcx> {
1359 self.mk_ty(TyInfer(it))
1362 pub fn mk_param(self,
1364 name: Name) -> Ty<'tcx> {
1365 self.mk_ty(TyParam(ParamTy { idx: index, name: name }))
1368 pub fn mk_self_type(self) -> Ty<'tcx> {
1369 self.mk_param(0, keywords::SelfType.name())
1372 pub fn mk_param_from_def(self, def: &ty::TypeParameterDef) -> Ty<'tcx> {
1373 self.mk_param(def.index, def.name)
1376 pub fn mk_anon(self, def_id: DefId, substs: &'tcx Substs<'tcx>) -> Ty<'tcx> {
1377 self.mk_ty(TyAnon(def_id, substs))
1380 pub fn intern_existential_predicates(self, eps: &[ExistentialPredicate<'tcx>])
1381 -> &'tcx Slice<ExistentialPredicate<'tcx>> {
1382 assert!(!eps.is_empty());
1383 assert!(eps.windows(2).all(|w| w[0].cmp(self, &w[1]) != Ordering::Greater));
1384 self._intern_existential_predicates(eps)
1387 pub fn intern_type_list(self, ts: &[Ty<'tcx>]) -> &'tcx Slice<Ty<'tcx>> {
1391 self._intern_type_list(ts)
1395 pub fn intern_substs(self, ts: &[Kind<'tcx>]) -> &'tcx Slice<Kind<'tcx>> {
1399 self._intern_substs(ts)
1403 pub fn mk_fn_sig<I>(self,
1407 unsafety: hir::Unsafety,
1409 -> <I::Item as InternIteratorElement<Ty<'tcx>, ty::FnSig<'tcx>>>::Output
1411 I::Item: InternIteratorElement<Ty<'tcx>, ty::FnSig<'tcx>>
1413 inputs.chain(iter::once(output)).intern_with(|xs| ty::FnSig {
1414 inputs_and_output: self.intern_type_list(xs),
1415 variadic, unsafety, abi
1419 pub fn mk_existential_predicates<I: InternAs<[ExistentialPredicate<'tcx>],
1420 &'tcx Slice<ExistentialPredicate<'tcx>>>>(self, iter: I)
1422 iter.intern_with(|xs| self.intern_existential_predicates(xs))
1425 pub fn mk_type_list<I: InternAs<[Ty<'tcx>],
1426 &'tcx Slice<Ty<'tcx>>>>(self, iter: I) -> I::Output {
1427 iter.intern_with(|xs| self.intern_type_list(xs))
1430 pub fn mk_substs<I: InternAs<[Kind<'tcx>],
1431 &'tcx Slice<Kind<'tcx>>>>(self, iter: I) -> I::Output {
1432 iter.intern_with(|xs| self.intern_substs(xs))
1435 pub fn mk_substs_trait(self,
1438 -> &'tcx Substs<'tcx>
1440 self.mk_substs(iter::once(s).chain(t.into_iter().cloned()).map(Kind::from))
1444 pub trait InternAs<T: ?Sized, R> {
1446 fn intern_with<F>(self, F) -> Self::Output
1447 where F: FnOnce(&T) -> R;
1450 impl<I, T, R, E> InternAs<[T], R> for I
1451 where E: InternIteratorElement<T, R>,
1452 I: Iterator<Item=E> {
1453 type Output = E::Output;
1454 fn intern_with<F>(self, f: F) -> Self::Output
1455 where F: FnOnce(&[T]) -> R {
1456 E::intern_with(self, f)
1460 pub trait InternIteratorElement<T, R>: Sized {
1462 fn intern_with<I: Iterator<Item=Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output;
1465 impl<T, R> InternIteratorElement<T, R> for T {
1467 fn intern_with<I: Iterator<Item=Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output {
1468 f(&iter.collect::<AccumulateVec<[_; 8]>>())
1472 impl<T, R, E> InternIteratorElement<T, R> for Result<T, E> {
1473 type Output = Result<R, E>;
1474 fn intern_with<I: Iterator<Item=Self>, F: FnOnce(&[T]) -> R>(iter: I, f: F) -> Self::Output {
1475 Ok(f(&iter.collect::<Result<AccumulateVec<[_; 8]>, _>>()?))