1 //! This module contains implements of the `Lift` and `TypeFoldable`
2 //! traits for various types in the Rust compiler. Most are written by
3 //! hand, though we've recently added some macros and proc-macros to help with the tedium.
5 use crate::mir::interpret;
6 use crate::mir::ProjectionKind;
7 use crate::ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
8 use crate::ty::print::{with_no_trimmed_paths, FmtPrinter, Printer};
9 use crate::ty::{self, InferConst, Lift, Ty, TyCtxt};
10 use rustc_data_structures::functor::IdFunctor;
12 use rustc_hir::def::Namespace;
13 use rustc_hir::def_id::CRATE_DEF_INDEX;
14 use rustc_index::vec::{Idx, IndexVec};
17 use std::ops::ControlFlow;
21 impl fmt::Debug for ty::TraitDef {
22 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
24 with_no_trimmed_paths(|| {
25 FmtPrinter::new(tcx, f, Namespace::TypeNS).print_def_path(self.def_id, &[])
32 impl fmt::Debug for ty::AdtDef {
33 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
35 with_no_trimmed_paths(|| {
36 FmtPrinter::new(tcx, f, Namespace::TypeNS).print_def_path(self.did, &[])
43 impl fmt::Debug for ty::UpvarId {
44 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
45 let name = ty::tls::with(|tcx| tcx.hir().name(self.var_path.hir_id));
46 write!(f, "UpvarId({:?};`{}`;{:?})", self.var_path.hir_id, name, self.closure_expr_id)
50 impl fmt::Debug for ty::UpvarBorrow<'tcx> {
51 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
52 write!(f, "UpvarBorrow({:?}, {:?})", self.kind, self.region)
56 impl fmt::Debug for ty::ExistentialTraitRef<'tcx> {
57 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
58 with_no_trimmed_paths(|| fmt::Display::fmt(self, f))
62 impl fmt::Debug for ty::adjustment::Adjustment<'tcx> {
63 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
64 write!(f, "{:?} -> {}", self.kind, self.target)
68 impl fmt::Debug for ty::BoundRegionKind {
69 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
71 ty::BrAnon(n) => write!(f, "BrAnon({:?})", n),
72 ty::BrNamed(did, name) => {
73 if did.index == CRATE_DEF_INDEX {
74 write!(f, "BrNamed({})", name)
76 write!(f, "BrNamed({:?}, {})", did, name)
79 ty::BrEnv => write!(f, "BrEnv"),
84 impl fmt::Debug for ty::RegionKind {
85 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
87 ty::ReEarlyBound(ref data) => write!(f, "ReEarlyBound({}, {})", data.index, data.name),
89 ty::ReLateBound(binder_id, ref bound_region) => {
90 write!(f, "ReLateBound({:?}, {:?})", binder_id, bound_region)
93 ty::ReFree(ref fr) => fr.fmt(f),
95 ty::ReStatic => write!(f, "ReStatic"),
97 ty::ReVar(ref vid) => vid.fmt(f),
99 ty::RePlaceholder(placeholder) => write!(f, "RePlaceholder({:?})", placeholder),
101 ty::ReEmpty(ui) => write!(f, "ReEmpty({:?})", ui),
103 ty::ReErased => write!(f, "ReErased"),
108 impl fmt::Debug for ty::FreeRegion {
109 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
110 write!(f, "ReFree({:?}, {:?})", self.scope, self.bound_region)
114 impl fmt::Debug for ty::FnSig<'tcx> {
115 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
116 write!(f, "({:?}; c_variadic: {})->{:?}", self.inputs(), self.c_variadic, self.output())
120 impl<'tcx> fmt::Debug for ty::ConstVid<'tcx> {
121 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
122 write!(f, "_#{}c", self.index)
126 impl fmt::Debug for ty::RegionVid {
127 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
128 write!(f, "'_#{}r", self.index())
132 impl fmt::Debug for ty::TraitRef<'tcx> {
133 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
134 with_no_trimmed_paths(|| fmt::Display::fmt(self, f))
138 impl fmt::Debug for Ty<'tcx> {
139 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
140 with_no_trimmed_paths(|| fmt::Display::fmt(self, f))
144 impl fmt::Debug for ty::ParamTy {
145 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
146 write!(f, "{}/#{}", self.name, self.index)
150 impl fmt::Debug for ty::ParamConst {
151 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
152 write!(f, "{}/#{}", self.name, self.index)
156 impl fmt::Debug for ty::TraitPredicate<'tcx> {
157 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
158 write!(f, "TraitPredicate({:?})", self.trait_ref)
162 impl fmt::Debug for ty::ProjectionPredicate<'tcx> {
163 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
164 write!(f, "ProjectionPredicate({:?}, {:?})", self.projection_ty, self.ty)
168 impl fmt::Debug for ty::Predicate<'tcx> {
169 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
170 write!(f, "{:?}", self.kind())
174 impl fmt::Debug for ty::PredicateKind<'tcx> {
175 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
177 ty::PredicateKind::Trait(ref a, constness) => {
178 if let hir::Constness::Const = constness {
179 write!(f, "const ")?;
183 ty::PredicateKind::Subtype(ref pair) => pair.fmt(f),
184 ty::PredicateKind::RegionOutlives(ref pair) => pair.fmt(f),
185 ty::PredicateKind::TypeOutlives(ref pair) => pair.fmt(f),
186 ty::PredicateKind::Projection(ref pair) => pair.fmt(f),
187 ty::PredicateKind::WellFormed(data) => write!(f, "WellFormed({:?})", data),
188 ty::PredicateKind::ObjectSafe(trait_def_id) => {
189 write!(f, "ObjectSafe({:?})", trait_def_id)
191 ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind) => {
192 write!(f, "ClosureKind({:?}, {:?}, {:?})", closure_def_id, closure_substs, kind)
194 ty::PredicateKind::ConstEvaluatable(def_id, substs) => {
195 write!(f, "ConstEvaluatable({:?}, {:?})", def_id, substs)
197 ty::PredicateKind::ConstEquate(c1, c2) => write!(f, "ConstEquate({:?}, {:?})", c1, c2),
198 ty::PredicateKind::TypeWellFormedFromEnv(ty) => {
199 write!(f, "TypeWellFormedFromEnv({:?})", ty)
205 ///////////////////////////////////////////////////////////////////////////
208 // For things that don't carry any arena-allocated data (and are
209 // copy...), just add them to this list.
211 TrivialTypeFoldableAndLiftImpls! {
215 ::rustc_target::abi::VariantIdx,
219 crate::middle::region::Scope,
221 ::rustc_ast::InlineAsmOptions,
222 ::rustc_ast::InlineAsmTemplatePiece,
224 ::rustc_span::symbol::Symbol,
225 ::rustc_hir::def::Res,
226 ::rustc_hir::def_id::DefId,
227 ::rustc_hir::def_id::LocalDefId,
229 ::rustc_hir::LlvmInlineAsmInner,
230 ::rustc_hir::MatchSource,
231 ::rustc_hir::Mutability,
232 ::rustc_hir::Unsafety,
233 ::rustc_target::asm::InlineAsmRegOrRegClass,
234 ::rustc_target::spec::abi::Abi,
235 crate::mir::coverage::ExpressionOperandId,
236 crate::mir::coverage::CounterValueReference,
237 crate::mir::coverage::InjectedExpressionId,
238 crate::mir::coverage::InjectedExpressionIndex,
239 crate::mir::coverage::MappedExpressionIndex,
241 crate::mir::Promoted,
242 crate::traits::Reveal,
243 crate::ty::adjustment::AutoBorrowMutability,
245 // Including `BoundRegionKind` is a *bit* dubious, but direct
246 // references to bound region appear in `ty::Error`, and aren't
247 // really meant to be folded. In general, we can only fold a fully
249 crate::ty::BoundRegionKind,
250 crate::ty::AssocItem,
251 crate::ty::Placeholder<crate::ty::BoundRegionKind>,
252 crate::ty::ClosureKind,
253 crate::ty::FreeRegion,
255 crate::ty::IntVarValue,
256 crate::ty::ParamConst,
258 crate::ty::adjustment::PointerCast,
259 crate::ty::RegionVid,
260 crate::ty::UniverseIndex,
265 ///////////////////////////////////////////////////////////////////////////
266 // Lift implementations
268 // FIXME(eddyb) replace all the uses of `Option::map` with `?`.
269 impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>> Lift<'tcx> for (A, B) {
270 type Lifted = (A::Lifted, B::Lifted);
271 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
272 Some((tcx.lift(self.0)?, tcx.lift(self.1)?))
276 impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>, C: Lift<'tcx>> Lift<'tcx> for (A, B, C) {
277 type Lifted = (A::Lifted, B::Lifted, C::Lifted);
278 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
279 Some((tcx.lift(self.0)?, tcx.lift(self.1)?, tcx.lift(self.2)?))
283 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Option<T> {
284 type Lifted = Option<T::Lifted>;
285 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
287 Some(x) => tcx.lift(x).map(Some),
293 impl<'tcx, T: Lift<'tcx>, E: Lift<'tcx>> Lift<'tcx> for Result<T, E> {
294 type Lifted = Result<T::Lifted, E::Lifted>;
295 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
297 Ok(x) => tcx.lift(x).map(Ok),
298 Err(e) => tcx.lift(e).map(Err),
303 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Box<T> {
304 type Lifted = Box<T::Lifted>;
305 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
306 tcx.lift(*self).map(Box::new)
310 impl<'tcx, T: Lift<'tcx> + Clone> Lift<'tcx> for Rc<T> {
311 type Lifted = Rc<T::Lifted>;
312 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
313 tcx.lift(self.as_ref().clone()).map(Rc::new)
317 impl<'tcx, T: Lift<'tcx> + Clone> Lift<'tcx> for Arc<T> {
318 type Lifted = Arc<T::Lifted>;
319 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
320 tcx.lift(self.as_ref().clone()).map(Arc::new)
323 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Vec<T> {
324 type Lifted = Vec<T::Lifted>;
325 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
326 self.into_iter().map(|v| tcx.lift(v)).collect()
330 impl<'tcx, I: Idx, T: Lift<'tcx>> Lift<'tcx> for IndexVec<I, T> {
331 type Lifted = IndexVec<I, T::Lifted>;
332 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
333 self.into_iter().map(|e| tcx.lift(e)).collect()
337 impl<'a, 'tcx> Lift<'tcx> for ty::TraitRef<'a> {
338 type Lifted = ty::TraitRef<'tcx>;
339 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
340 tcx.lift(self.substs).map(|substs| ty::TraitRef { def_id: self.def_id, substs })
344 impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialTraitRef<'a> {
345 type Lifted = ty::ExistentialTraitRef<'tcx>;
346 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
347 tcx.lift(self.substs).map(|substs| ty::ExistentialTraitRef { def_id: self.def_id, substs })
351 impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialPredicate<'a> {
352 type Lifted = ty::ExistentialPredicate<'tcx>;
353 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
355 ty::ExistentialPredicate::Trait(x) => tcx.lift(x).map(ty::ExistentialPredicate::Trait),
356 ty::ExistentialPredicate::Projection(x) => {
357 tcx.lift(x).map(ty::ExistentialPredicate::Projection)
359 ty::ExistentialPredicate::AutoTrait(def_id) => {
360 Some(ty::ExistentialPredicate::AutoTrait(def_id))
366 impl<'a, 'tcx> Lift<'tcx> for ty::TraitPredicate<'a> {
367 type Lifted = ty::TraitPredicate<'tcx>;
368 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::TraitPredicate<'tcx>> {
369 tcx.lift(self.trait_ref).map(|trait_ref| ty::TraitPredicate { trait_ref })
373 impl<'a, 'tcx> Lift<'tcx> for ty::SubtypePredicate<'a> {
374 type Lifted = ty::SubtypePredicate<'tcx>;
375 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::SubtypePredicate<'tcx>> {
376 tcx.lift((self.a, self.b)).map(|(a, b)| ty::SubtypePredicate {
377 a_is_expected: self.a_is_expected,
384 impl<'tcx, A: Copy + Lift<'tcx>, B: Copy + Lift<'tcx>> Lift<'tcx> for ty::OutlivesPredicate<A, B> {
385 type Lifted = ty::OutlivesPredicate<A::Lifted, B::Lifted>;
386 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
387 tcx.lift((self.0, self.1)).map(|(a, b)| ty::OutlivesPredicate(a, b))
391 impl<'a, 'tcx> Lift<'tcx> for ty::ProjectionTy<'a> {
392 type Lifted = ty::ProjectionTy<'tcx>;
393 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::ProjectionTy<'tcx>> {
394 tcx.lift(self.substs)
395 .map(|substs| ty::ProjectionTy { item_def_id: self.item_def_id, substs })
399 impl<'a, 'tcx> Lift<'tcx> for ty::ProjectionPredicate<'a> {
400 type Lifted = ty::ProjectionPredicate<'tcx>;
401 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::ProjectionPredicate<'tcx>> {
402 tcx.lift((self.projection_ty, self.ty))
403 .map(|(projection_ty, ty)| ty::ProjectionPredicate { projection_ty, ty })
407 impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialProjection<'a> {
408 type Lifted = ty::ExistentialProjection<'tcx>;
409 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
410 tcx.lift(self.substs).map(|substs| ty::ExistentialProjection {
412 ty: tcx.lift(self.ty).expect("type must lift when substs do"),
413 item_def_id: self.item_def_id,
418 impl<'a, 'tcx> Lift<'tcx> for ty::PredicateKind<'a> {
419 type Lifted = ty::PredicateKind<'tcx>;
420 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
422 ty::PredicateKind::Trait(data, constness) => {
423 tcx.lift(data).map(|data| ty::PredicateKind::Trait(data, constness))
425 ty::PredicateKind::Subtype(data) => tcx.lift(data).map(ty::PredicateKind::Subtype),
426 ty::PredicateKind::RegionOutlives(data) => {
427 tcx.lift(data).map(ty::PredicateKind::RegionOutlives)
429 ty::PredicateKind::TypeOutlives(data) => {
430 tcx.lift(data).map(ty::PredicateKind::TypeOutlives)
432 ty::PredicateKind::Projection(data) => {
433 tcx.lift(data).map(ty::PredicateKind::Projection)
435 ty::PredicateKind::WellFormed(ty) => tcx.lift(ty).map(ty::PredicateKind::WellFormed),
436 ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind) => {
437 tcx.lift(closure_substs).map(|closure_substs| {
438 ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind)
441 ty::PredicateKind::ObjectSafe(trait_def_id) => {
442 Some(ty::PredicateKind::ObjectSafe(trait_def_id))
444 ty::PredicateKind::ConstEvaluatable(def_id, substs) => {
445 tcx.lift(substs).map(|substs| ty::PredicateKind::ConstEvaluatable(def_id, substs))
447 ty::PredicateKind::ConstEquate(c1, c2) => {
448 tcx.lift((c1, c2)).map(|(c1, c2)| ty::PredicateKind::ConstEquate(c1, c2))
450 ty::PredicateKind::TypeWellFormedFromEnv(ty) => {
451 tcx.lift(ty).map(ty::PredicateKind::TypeWellFormedFromEnv)
457 impl<'a, 'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::Binder<'a, T>
459 <T as Lift<'tcx>>::Lifted: TypeFoldable<'tcx>,
461 type Lifted = ty::Binder<'tcx, T::Lifted>;
462 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
463 // FIXME: need to lift inner values
464 tcx.lift(self.skip_binder()).map(|v| ty::Binder::bind(v))
468 impl<'a, 'tcx> Lift<'tcx> for ty::ParamEnv<'a> {
469 type Lifted = ty::ParamEnv<'tcx>;
470 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
471 tcx.lift(self.caller_bounds())
472 .map(|caller_bounds| ty::ParamEnv::new(caller_bounds, self.reveal()))
476 impl<'a, 'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::ParamEnvAnd<'a, T> {
477 type Lifted = ty::ParamEnvAnd<'tcx, T::Lifted>;
478 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
479 tcx.lift(self.param_env).and_then(|param_env| {
480 tcx.lift(self.value).map(|value| ty::ParamEnvAnd { param_env, value })
485 impl<'a, 'tcx> Lift<'tcx> for ty::ClosureSubsts<'a> {
486 type Lifted = ty::ClosureSubsts<'tcx>;
487 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
488 tcx.lift(self.substs).map(|substs| ty::ClosureSubsts { substs })
492 impl<'a, 'tcx> Lift<'tcx> for ty::GeneratorSubsts<'a> {
493 type Lifted = ty::GeneratorSubsts<'tcx>;
494 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
495 tcx.lift(self.substs).map(|substs| ty::GeneratorSubsts { substs })
499 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjustment<'a> {
500 type Lifted = ty::adjustment::Adjustment<'tcx>;
501 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
502 let ty::adjustment::Adjustment { kind, target } = self;
503 tcx.lift(kind).and_then(|kind| {
504 tcx.lift(target).map(|target| ty::adjustment::Adjustment { kind, target })
509 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjust<'a> {
510 type Lifted = ty::adjustment::Adjust<'tcx>;
511 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
513 ty::adjustment::Adjust::NeverToAny => Some(ty::adjustment::Adjust::NeverToAny),
514 ty::adjustment::Adjust::Pointer(ptr) => Some(ty::adjustment::Adjust::Pointer(ptr)),
515 ty::adjustment::Adjust::Deref(overloaded) => {
516 tcx.lift(overloaded).map(ty::adjustment::Adjust::Deref)
518 ty::adjustment::Adjust::Borrow(autoref) => {
519 tcx.lift(autoref).map(ty::adjustment::Adjust::Borrow)
525 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::OverloadedDeref<'a> {
526 type Lifted = ty::adjustment::OverloadedDeref<'tcx>;
527 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
528 tcx.lift(self.region).map(|region| ty::adjustment::OverloadedDeref {
536 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::AutoBorrow<'a> {
537 type Lifted = ty::adjustment::AutoBorrow<'tcx>;
538 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
540 ty::adjustment::AutoBorrow::Ref(r, m) => {
541 tcx.lift(r).map(|r| ty::adjustment::AutoBorrow::Ref(r, m))
543 ty::adjustment::AutoBorrow::RawPtr(m) => Some(ty::adjustment::AutoBorrow::RawPtr(m)),
548 impl<'a, 'tcx> Lift<'tcx> for ty::GenSig<'a> {
549 type Lifted = ty::GenSig<'tcx>;
550 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
551 tcx.lift((self.resume_ty, self.yield_ty, self.return_ty))
552 .map(|(resume_ty, yield_ty, return_ty)| ty::GenSig { resume_ty, yield_ty, return_ty })
556 impl<'a, 'tcx> Lift<'tcx> for ty::FnSig<'a> {
557 type Lifted = ty::FnSig<'tcx>;
558 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
559 tcx.lift(self.inputs_and_output).map(|x| ty::FnSig {
560 inputs_and_output: x,
561 c_variadic: self.c_variadic,
562 unsafety: self.unsafety,
568 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::error::ExpectedFound<T> {
569 type Lifted = ty::error::ExpectedFound<T::Lifted>;
570 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
571 let ty::error::ExpectedFound { expected, found } = self;
572 tcx.lift(expected).and_then(|expected| {
573 tcx.lift(found).map(|found| ty::error::ExpectedFound { expected, found })
578 impl<'a, 'tcx> Lift<'tcx> for ty::error::TypeError<'a> {
579 type Lifted = ty::error::TypeError<'tcx>;
580 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
581 use crate::ty::error::TypeError::*;
584 Mismatch => Mismatch,
585 UnsafetyMismatch(x) => UnsafetyMismatch(x),
586 AbiMismatch(x) => AbiMismatch(x),
587 Mutability => Mutability,
588 TupleSize(x) => TupleSize(x),
589 FixedArraySize(x) => FixedArraySize(x),
590 ArgCount => ArgCount,
591 RegionsDoesNotOutlive(a, b) => {
592 return tcx.lift((a, b)).map(|(a, b)| RegionsDoesNotOutlive(a, b));
594 RegionsInsufficientlyPolymorphic(a, b) => {
595 return tcx.lift(b).map(|b| RegionsInsufficientlyPolymorphic(a, b));
597 RegionsOverlyPolymorphic(a, b) => {
598 return tcx.lift(b).map(|b| RegionsOverlyPolymorphic(a, b));
600 RegionsPlaceholderMismatch => RegionsPlaceholderMismatch,
601 IntMismatch(x) => IntMismatch(x),
602 FloatMismatch(x) => FloatMismatch(x),
603 Traits(x) => Traits(x),
604 VariadicMismatch(x) => VariadicMismatch(x),
605 CyclicTy(t) => return tcx.lift(t).map(|t| CyclicTy(t)),
606 CyclicConst(ct) => return tcx.lift(ct).map(|ct| CyclicConst(ct)),
607 ProjectionMismatched(x) => ProjectionMismatched(x),
608 Sorts(x) => return tcx.lift(x).map(Sorts),
609 ExistentialMismatch(x) => return tcx.lift(x).map(ExistentialMismatch),
610 ConstMismatch(x) => return tcx.lift(x).map(ConstMismatch),
611 IntrinsicCast => IntrinsicCast,
612 TargetFeatureCast(x) => TargetFeatureCast(x),
613 ObjectUnsafeCoercion(x) => return tcx.lift(x).map(ObjectUnsafeCoercion),
618 impl<'a, 'tcx> Lift<'tcx> for ty::InstanceDef<'a> {
619 type Lifted = ty::InstanceDef<'tcx>;
620 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
622 ty::InstanceDef::Item(def_id) => Some(ty::InstanceDef::Item(def_id)),
623 ty::InstanceDef::VtableShim(def_id) => Some(ty::InstanceDef::VtableShim(def_id)),
624 ty::InstanceDef::ReifyShim(def_id) => Some(ty::InstanceDef::ReifyShim(def_id)),
625 ty::InstanceDef::Intrinsic(def_id) => Some(ty::InstanceDef::Intrinsic(def_id)),
626 ty::InstanceDef::FnPtrShim(def_id, ty) => {
627 Some(ty::InstanceDef::FnPtrShim(def_id, tcx.lift(ty)?))
629 ty::InstanceDef::Virtual(def_id, n) => Some(ty::InstanceDef::Virtual(def_id, n)),
630 ty::InstanceDef::ClosureOnceShim { call_once } => {
631 Some(ty::InstanceDef::ClosureOnceShim { call_once })
633 ty::InstanceDef::DropGlue(def_id, ty) => {
634 Some(ty::InstanceDef::DropGlue(def_id, tcx.lift(ty)?))
636 ty::InstanceDef::CloneShim(def_id, ty) => {
637 Some(ty::InstanceDef::CloneShim(def_id, tcx.lift(ty)?))
643 ///////////////////////////////////////////////////////////////////////////
644 // TypeFoldable implementations.
646 // Ideally, each type should invoke `folder.fold_foo(self)` and
647 // nothing else. In some cases, though, we haven't gotten around to
648 // adding methods on the `folder` yet, and thus the folding is
649 // hard-coded here. This is less-flexible, because folders cannot
650 // override the behavior, but there are a lot of random types and one
651 // can easily refactor the folding into the TypeFolder trait as
654 /// AdtDefs are basically the same as a DefId.
655 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::AdtDef {
656 fn super_fold_with<F: TypeFolder<'tcx>>(self, _folder: &mut F) -> Self {
660 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
661 ControlFlow::CONTINUE
665 impl<'tcx, T: TypeFoldable<'tcx>, U: TypeFoldable<'tcx>> TypeFoldable<'tcx> for (T, U) {
666 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> (T, U) {
667 (self.0.fold_with(folder), self.1.fold_with(folder))
670 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
671 self.0.visit_with(visitor)?;
672 self.1.visit_with(visitor)
676 impl<'tcx, A: TypeFoldable<'tcx>, B: TypeFoldable<'tcx>, C: TypeFoldable<'tcx>> TypeFoldable<'tcx>
679 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> (A, B, C) {
680 (self.0.fold_with(folder), self.1.fold_with(folder), self.2.fold_with(folder))
683 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
684 self.0.visit_with(visitor)?;
685 self.1.visit_with(visitor)?;
686 self.2.visit_with(visitor)
690 EnumTypeFoldableImpl! {
691 impl<'tcx, T> TypeFoldable<'tcx> for Option<T> {
694 } where T: TypeFoldable<'tcx>
697 EnumTypeFoldableImpl! {
698 impl<'tcx, T, E> TypeFoldable<'tcx> for Result<T, E> {
701 } where T: TypeFoldable<'tcx>, E: TypeFoldable<'tcx>,
704 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Rc<T> {
705 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
706 // FIXME: Reuse the `Rc` here.
707 Rc::new((*self).clone().fold_with(folder))
710 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
711 (**self).visit_with(visitor)
715 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Arc<T> {
716 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
717 // FIXME: Reuse the `Arc` here.
718 Arc::new((*self).clone().fold_with(folder))
721 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
722 (**self).visit_with(visitor)
726 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<T> {
727 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
728 self.map_id(|value| value.fold_with(folder))
731 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
732 (**self).visit_with(visitor)
736 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Vec<T> {
737 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
738 self.map_id(|t| t.fold_with(folder))
741 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
742 self.iter().try_for_each(|t| t.visit_with(visitor))
746 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<[T]> {
747 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
748 self.map_id(|t| t.fold_with(folder))
751 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
752 self.iter().try_for_each(|t| t.visit_with(visitor))
756 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for ty::Binder<'tcx, T> {
757 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
758 self.map_bound(|ty| ty.fold_with(folder))
761 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
762 folder.fold_binder(self)
765 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
766 self.as_ref().skip_binder().visit_with(visitor)
769 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
770 visitor.visit_binder(self)
774 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Binder<'tcx, ty::ExistentialPredicate<'tcx>>> {
775 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
776 ty::util::fold_list(self, folder, |tcx, v| tcx.intern_poly_existential_predicates(v))
779 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
780 self.iter().try_for_each(|p| p.visit_with(visitor))
784 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<Ty<'tcx>> {
785 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
786 ty::util::fold_list(self, folder, |tcx, v| tcx.intern_type_list(v))
789 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
790 self.iter().try_for_each(|t| t.visit_with(visitor))
794 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ProjectionKind> {
795 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
796 ty::util::fold_list(self, folder, |tcx, v| tcx.intern_projs(v))
799 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
800 self.iter().try_for_each(|t| t.visit_with(visitor))
804 impl<'tcx> TypeFoldable<'tcx> for ty::instance::Instance<'tcx> {
805 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
806 use crate::ty::InstanceDef::*;
808 substs: self.substs.fold_with(folder),
809 def: match self.def {
810 Item(def) => Item(def.fold_with(folder)),
811 VtableShim(did) => VtableShim(did.fold_with(folder)),
812 ReifyShim(did) => ReifyShim(did.fold_with(folder)),
813 Intrinsic(did) => Intrinsic(did.fold_with(folder)),
814 FnPtrShim(did, ty) => FnPtrShim(did.fold_with(folder), ty.fold_with(folder)),
815 Virtual(did, i) => Virtual(did.fold_with(folder), i),
816 ClosureOnceShim { call_once } => {
817 ClosureOnceShim { call_once: call_once.fold_with(folder) }
819 DropGlue(did, ty) => DropGlue(did.fold_with(folder), ty.fold_with(folder)),
820 CloneShim(did, ty) => CloneShim(did.fold_with(folder), ty.fold_with(folder)),
825 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
826 use crate::ty::InstanceDef::*;
827 self.substs.visit_with(visitor)?;
829 Item(def) => def.visit_with(visitor),
830 VtableShim(did) | ReifyShim(did) | Intrinsic(did) | Virtual(did, _) => {
831 did.visit_with(visitor)
833 FnPtrShim(did, ty) | CloneShim(did, ty) => {
834 did.visit_with(visitor)?;
835 ty.visit_with(visitor)
837 DropGlue(did, ty) => {
838 did.visit_with(visitor)?;
839 ty.visit_with(visitor)
841 ClosureOnceShim { call_once } => call_once.visit_with(visitor),
846 impl<'tcx> TypeFoldable<'tcx> for interpret::GlobalId<'tcx> {
847 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
848 Self { instance: self.instance.fold_with(folder), promoted: self.promoted }
851 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
852 self.instance.visit_with(visitor)
856 impl<'tcx> TypeFoldable<'tcx> for Ty<'tcx> {
857 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
858 let kind = match *self.kind() {
859 ty::RawPtr(tm) => ty::RawPtr(tm.fold_with(folder)),
860 ty::Array(typ, sz) => ty::Array(typ.fold_with(folder), sz.fold_with(folder)),
861 ty::Slice(typ) => ty::Slice(typ.fold_with(folder)),
862 ty::Adt(tid, substs) => ty::Adt(tid, substs.fold_with(folder)),
863 ty::Dynamic(trait_ty, region) => {
864 ty::Dynamic(trait_ty.fold_with(folder), region.fold_with(folder))
866 ty::Tuple(ts) => ty::Tuple(ts.fold_with(folder)),
867 ty::FnDef(def_id, substs) => ty::FnDef(def_id, substs.fold_with(folder)),
868 ty::FnPtr(f) => ty::FnPtr(f.fold_with(folder)),
869 ty::Ref(r, ty, mutbl) => ty::Ref(r.fold_with(folder), ty.fold_with(folder), mutbl),
870 ty::Generator(did, substs, movability) => {
871 ty::Generator(did, substs.fold_with(folder), movability)
873 ty::GeneratorWitness(types) => ty::GeneratorWitness(types.fold_with(folder)),
874 ty::Closure(did, substs) => ty::Closure(did, substs.fold_with(folder)),
875 ty::Projection(data) => ty::Projection(data.fold_with(folder)),
876 ty::Opaque(did, substs) => ty::Opaque(did, substs.fold_with(folder)),
888 | ty::Placeholder(..)
890 | ty::Foreign(..) => return self,
893 if *self.kind() == kind { self } else { folder.tcx().mk_ty(kind) }
896 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
900 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
902 ty::RawPtr(ref tm) => tm.visit_with(visitor),
903 ty::Array(typ, sz) => {
904 typ.visit_with(visitor)?;
905 sz.visit_with(visitor)
907 ty::Slice(typ) => typ.visit_with(visitor),
908 ty::Adt(_, substs) => substs.visit_with(visitor),
909 ty::Dynamic(ref trait_ty, ref reg) => {
910 trait_ty.visit_with(visitor)?;
911 reg.visit_with(visitor)
913 ty::Tuple(ts) => ts.visit_with(visitor),
914 ty::FnDef(_, substs) => substs.visit_with(visitor),
915 ty::FnPtr(ref f) => f.visit_with(visitor),
916 ty::Ref(r, ty, _) => {
917 r.visit_with(visitor)?;
918 ty.visit_with(visitor)
920 ty::Generator(_did, ref substs, _) => substs.visit_with(visitor),
921 ty::GeneratorWitness(ref types) => types.visit_with(visitor),
922 ty::Closure(_did, ref substs) => substs.visit_with(visitor),
923 ty::Projection(ref data) => data.visit_with(visitor),
924 ty::Opaque(_, ref substs) => substs.visit_with(visitor),
935 | ty::Placeholder(..)
938 | ty::Foreign(..) => ControlFlow::CONTINUE,
942 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
943 visitor.visit_ty(self)
947 impl<'tcx> TypeFoldable<'tcx> for ty::Region<'tcx> {
948 fn super_fold_with<F: TypeFolder<'tcx>>(self, _folder: &mut F) -> Self {
952 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
953 folder.fold_region(self)
956 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
957 ControlFlow::CONTINUE
960 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
961 visitor.visit_region(*self)
965 impl<'tcx> TypeFoldable<'tcx> for ty::Predicate<'tcx> {
966 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
967 let new = self.inner.kind.fold_with(folder);
968 folder.tcx().reuse_or_mk_predicate(self, new)
971 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
972 self.inner.kind.visit_with(visitor)
975 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
976 visitor.visit_predicate(*self)
979 fn has_vars_bound_at_or_above(&self, binder: ty::DebruijnIndex) -> bool {
980 self.inner.outer_exclusive_binder > binder
983 fn has_type_flags(&self, flags: ty::TypeFlags) -> bool {
984 self.inner.flags.intersects(flags)
988 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Predicate<'tcx>> {
989 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
990 ty::util::fold_list(self, folder, |tcx, v| tcx.intern_predicates(v))
993 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
994 self.iter().try_for_each(|p| p.visit_with(visitor))
998 impl<'tcx, T: TypeFoldable<'tcx>, I: Idx> TypeFoldable<'tcx> for IndexVec<I, T> {
999 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1000 self.map_id(|x| x.fold_with(folder))
1003 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1004 self.iter().try_for_each(|t| t.visit_with(visitor))
1008 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::Const<'tcx> {
1009 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1010 let ty = self.ty.fold_with(folder);
1011 let val = self.val.fold_with(folder);
1012 if ty != self.ty || val != self.val {
1013 folder.tcx().mk_const(ty::Const { ty, val })
1019 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1020 folder.fold_const(self)
1023 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1024 self.ty.visit_with(visitor)?;
1025 self.val.visit_with(visitor)
1028 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1029 visitor.visit_const(self)
1033 impl<'tcx> TypeFoldable<'tcx> for ty::ConstKind<'tcx> {
1034 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1036 ty::ConstKind::Infer(ic) => ty::ConstKind::Infer(ic.fold_with(folder)),
1037 ty::ConstKind::Param(p) => ty::ConstKind::Param(p.fold_with(folder)),
1038 ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }) => {
1039 ty::ConstKind::Unevaluated(ty::Unevaluated {
1041 substs: substs.fold_with(folder),
1045 ty::ConstKind::Value(_)
1046 | ty::ConstKind::Bound(..)
1047 | ty::ConstKind::Placeholder(..)
1048 | ty::ConstKind::Error(_) => self,
1052 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1054 ty::ConstKind::Infer(ic) => ic.visit_with(visitor),
1055 ty::ConstKind::Param(p) => p.visit_with(visitor),
1056 ty::ConstKind::Unevaluated(ct) => ct.substs.visit_with(visitor),
1057 ty::ConstKind::Value(_)
1058 | ty::ConstKind::Bound(..)
1059 | ty::ConstKind::Placeholder(_)
1060 | ty::ConstKind::Error(_) => ControlFlow::CONTINUE,
1065 impl<'tcx> TypeFoldable<'tcx> for InferConst<'tcx> {
1066 fn super_fold_with<F: TypeFolder<'tcx>>(self, _folder: &mut F) -> Self {
1070 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
1071 ControlFlow::CONTINUE