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Commit | Line | Data |
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f9f354fc XL |
1 | //! Contains the logic to lower rustc types into Chalk types |
2 | //! | |
3 | //! In many cases there is a 1:1 relationship between a rustc type and a Chalk type. | |
4 | //! For example, a `SubstsRef` maps almost directly to a `Substitution`. In some | |
5 | //! other cases, such as `Param`s, there is no Chalk type, so we have to handle | |
6 | //! accordingly. | |
7 | //! | |
8 | //! ## `Ty` lowering | |
9 | //! Much of the `Ty` lowering is 1:1 with Chalk. (Or will be eventually). A | |
10 | //! helpful table for what types lower to what can be found in the | |
136023e0 | 11 | //! [Chalk book](https://rust-lang.github.io/chalk/book/types/rust_types.html). |
f9f354fc XL |
12 | //! The most notable difference lies with `Param`s. To convert from rustc to |
13 | //! Chalk, we eagerly and deeply convert `Param`s to placeholders (in goals) or | |
14 | //! bound variables (for clause generation through functions in `db`). | |
15 | //! | |
16 | //! ## `Region` lowering | |
17 | //! Regions are handled in rustc and Chalk is quite differently. In rustc, there | |
18 | //! is a difference between "early bound" and "late bound" regions, where only | |
19 | //! the late bound regions have a `DebruijnIndex`. Moreover, in Chalk all | |
20 | //! regions (Lifetimes) have an associated index. In rustc, only `BrAnon`s have | |
21 | //! an index, whereas `BrNamed` don't. In order to lower regions to Chalk, we | |
22 | //! convert all regions into `BrAnon` late-bound regions. | |
23 | //! | |
24 | //! ## `Const` lowering | |
25 | //! Chalk doesn't handle consts currently, so consts are currently lowered to | |
26 | //! an empty tuple. | |
27 | //! | |
28 | //! ## Bound variable collection | |
29 | //! Another difference between rustc and Chalk lies in the handling of binders. | |
30 | //! Chalk requires that we store the bound parameter kinds, whereas rustc does | |
31 | //! not. To lower anything wrapped in a `Binder`, we first deeply find any bound | |
32 | //! variables from the current `Binder`. | |
33 | ||
29967ef6 | 34 | use rustc_ast::ast; |
1b1a35ee | 35 | use rustc_middle::traits::{ChalkEnvironmentAndGoal, ChalkRustInterner as RustInterner}; |
f035d41b | 36 | use rustc_middle::ty::subst::{GenericArg, GenericArgKind, SubstsRef}; |
923072b8 | 37 | use rustc_middle::ty::{ |
064997fb FG |
38 | self, Binder, Region, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, |
39 | TypeSuperVisitable, TypeVisitable, TypeVisitor, | |
923072b8 | 40 | }; |
f9f354fc XL |
41 | use rustc_span::def_id::DefId; |
42 | ||
1b1a35ee XL |
43 | use chalk_ir::{FnSig, ForeignDefId}; |
44 | use rustc_hir::Unsafety; | |
f9f354fc | 45 | use std::collections::btree_map::{BTreeMap, Entry}; |
29967ef6 | 46 | use std::ops::ControlFlow; |
f9f354fc XL |
47 | |
48 | /// Essentially an `Into` with a `&RustInterner` parameter | |
923072b8 | 49 | pub(crate) trait LowerInto<'tcx, T> { |
f9f354fc | 50 | /// Lower a rustc construct (e.g., `ty::TraitPredicate`) to a chalk type, consuming `self`. |
a2a8927a | 51 | fn lower_into(self, interner: RustInterner<'tcx>) -> T; |
f9f354fc XL |
52 | } |
53 | ||
54 | impl<'tcx> LowerInto<'tcx, chalk_ir::Substitution<RustInterner<'tcx>>> for SubstsRef<'tcx> { | |
55 | fn lower_into( | |
56 | self, | |
a2a8927a | 57 | interner: RustInterner<'tcx>, |
f9f354fc | 58 | ) -> chalk_ir::Substitution<RustInterner<'tcx>> { |
1b1a35ee XL |
59 | chalk_ir::Substitution::from_iter(interner, self.iter().map(|s| s.lower_into(interner))) |
60 | } | |
61 | } | |
62 | ||
63 | impl<'tcx> LowerInto<'tcx, SubstsRef<'tcx>> for &chalk_ir::Substitution<RustInterner<'tcx>> { | |
a2a8927a | 64 | fn lower_into(self, interner: RustInterner<'tcx>) -> SubstsRef<'tcx> { |
1b1a35ee | 65 | interner.tcx.mk_substs(self.iter(interner).map(|subst| subst.lower_into(interner))) |
f9f354fc XL |
66 | } |
67 | } | |
68 | ||
69 | impl<'tcx> LowerInto<'tcx, chalk_ir::AliasTy<RustInterner<'tcx>>> for ty::ProjectionTy<'tcx> { | |
a2a8927a | 70 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::AliasTy<RustInterner<'tcx>> { |
f9f354fc | 71 | chalk_ir::AliasTy::Projection(chalk_ir::ProjectionTy { |
f035d41b | 72 | associated_ty_id: chalk_ir::AssocTypeId(self.item_def_id), |
f9f354fc XL |
73 | substitution: self.substs.lower_into(interner), |
74 | }) | |
75 | } | |
76 | } | |
77 | ||
78 | impl<'tcx> LowerInto<'tcx, chalk_ir::InEnvironment<chalk_ir::Goal<RustInterner<'tcx>>>> | |
79 | for ChalkEnvironmentAndGoal<'tcx> | |
80 | { | |
81 | fn lower_into( | |
82 | self, | |
a2a8927a | 83 | interner: RustInterner<'tcx>, |
f9f354fc | 84 | ) -> chalk_ir::InEnvironment<chalk_ir::Goal<RustInterner<'tcx>>> { |
1b1a35ee | 85 | let clauses = self.environment.into_iter().map(|predicate| { |
5869c6ff XL |
86 | let (predicate, binders, _named_regions) = |
87 | collect_bound_vars(interner, interner.tcx, predicate.kind()); | |
1b1a35ee | 88 | let consequence = match predicate { |
5869c6ff | 89 | ty::PredicateKind::TypeWellFormedFromEnv(ty) => { |
1b1a35ee | 90 | chalk_ir::DomainGoal::FromEnv(chalk_ir::FromEnv::Ty(ty.lower_into(interner))) |
f9f354fc | 91 | } |
94222f64 | 92 | ty::PredicateKind::Trait(predicate) => chalk_ir::DomainGoal::FromEnv( |
1b1a35ee XL |
93 | chalk_ir::FromEnv::Trait(predicate.trait_ref.lower_into(interner)), |
94 | ), | |
5869c6ff | 95 | ty::PredicateKind::RegionOutlives(predicate) => chalk_ir::DomainGoal::Holds( |
1b1a35ee XL |
96 | chalk_ir::WhereClause::LifetimeOutlives(chalk_ir::LifetimeOutlives { |
97 | a: predicate.0.lower_into(interner), | |
98 | b: predicate.1.lower_into(interner), | |
99 | }), | |
100 | ), | |
5869c6ff | 101 | ty::PredicateKind::TypeOutlives(predicate) => chalk_ir::DomainGoal::Holds( |
1b1a35ee XL |
102 | chalk_ir::WhereClause::TypeOutlives(chalk_ir::TypeOutlives { |
103 | ty: predicate.0.lower_into(interner), | |
104 | lifetime: predicate.1.lower_into(interner), | |
105 | }), | |
106 | ), | |
5869c6ff | 107 | ty::PredicateKind::Projection(predicate) => chalk_ir::DomainGoal::Holds( |
1b1a35ee XL |
108 | chalk_ir::WhereClause::AliasEq(predicate.lower_into(interner)), |
109 | ), | |
064997fb FG |
110 | ty::PredicateKind::WellFormed(arg) => match arg.unpack() { |
111 | ty::GenericArgKind::Type(ty) => chalk_ir::DomainGoal::WellFormed( | |
112 | chalk_ir::WellFormed::Ty(ty.lower_into(interner)), | |
113 | ), | |
114 | // FIXME(chalk): we need to change `WellFormed` in Chalk to take a `GenericArg` | |
115 | _ => chalk_ir::DomainGoal::WellFormed(chalk_ir::WellFormed::Ty( | |
116 | interner.tcx.types.unit.lower_into(interner), | |
117 | )), | |
118 | }, | |
119 | ty::PredicateKind::ObjectSafe(..) | |
5869c6ff XL |
120 | | ty::PredicateKind::ClosureKind(..) |
121 | | ty::PredicateKind::Subtype(..) | |
94222f64 | 122 | | ty::PredicateKind::Coerce(..) |
5869c6ff XL |
123 | | ty::PredicateKind::ConstEvaluatable(..) |
124 | | ty::PredicateKind::ConstEquate(..) => bug!("unexpected predicate {}", predicate), | |
1b1a35ee XL |
125 | }; |
126 | let value = chalk_ir::ProgramClauseImplication { | |
127 | consequence, | |
128 | conditions: chalk_ir::Goals::empty(interner), | |
129 | priority: chalk_ir::ClausePriority::High, | |
130 | constraints: chalk_ir::Constraints::empty(interner), | |
131 | }; | |
132 | chalk_ir::ProgramClauseData(chalk_ir::Binders::new(binders, value)).intern(interner) | |
f9f354fc XL |
133 | }); |
134 | ||
a2a8927a | 135 | let goal: chalk_ir::GoalData<RustInterner<'tcx>> = self.goal.lower_into(interner); |
f9f354fc XL |
136 | chalk_ir::InEnvironment { |
137 | environment: chalk_ir::Environment { | |
a2a8927a | 138 | clauses: chalk_ir::ProgramClauses::from_iter(interner, clauses), |
f9f354fc | 139 | }, |
a2a8927a | 140 | goal: goal.intern(interner), |
f9f354fc XL |
141 | } |
142 | } | |
143 | } | |
144 | ||
145 | impl<'tcx> LowerInto<'tcx, chalk_ir::GoalData<RustInterner<'tcx>>> for ty::Predicate<'tcx> { | |
a2a8927a | 146 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::GoalData<RustInterner<'tcx>> { |
5869c6ff XL |
147 | let (predicate, binders, _named_regions) = |
148 | collect_bound_vars(interner, interner.tcx, self.kind()); | |
1b1a35ee XL |
149 | |
150 | let value = match predicate { | |
94222f64 | 151 | ty::PredicateKind::Trait(predicate) => { |
1b1a35ee XL |
152 | chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::Holds( |
153 | chalk_ir::WhereClause::Implemented(predicate.trait_ref.lower_into(interner)), | |
154 | )) | |
3dfed10e | 155 | } |
5869c6ff | 156 | ty::PredicateKind::RegionOutlives(predicate) => { |
1b1a35ee XL |
157 | chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::Holds( |
158 | chalk_ir::WhereClause::LifetimeOutlives(chalk_ir::LifetimeOutlives { | |
159 | a: predicate.0.lower_into(interner), | |
160 | b: predicate.1.lower_into(interner), | |
161 | }), | |
162 | )) | |
f9f354fc | 163 | } |
5869c6ff | 164 | ty::PredicateKind::TypeOutlives(predicate) => { |
1b1a35ee XL |
165 | chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::Holds( |
166 | chalk_ir::WhereClause::TypeOutlives(chalk_ir::TypeOutlives { | |
167 | ty: predicate.0.lower_into(interner), | |
168 | lifetime: predicate.1.lower_into(interner), | |
169 | }), | |
170 | )) | |
f9f354fc | 171 | } |
5869c6ff | 172 | ty::PredicateKind::Projection(predicate) => { |
1b1a35ee XL |
173 | chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::Holds( |
174 | chalk_ir::WhereClause::AliasEq(predicate.lower_into(interner)), | |
175 | )) | |
3dfed10e | 176 | } |
5869c6ff | 177 | ty::PredicateKind::WellFormed(arg) => match arg.unpack() { |
1b1a35ee | 178 | GenericArgKind::Type(ty) => match ty.kind() { |
f035d41b XL |
179 | // FIXME(chalk): In Chalk, a placeholder is WellFormed if it |
180 | // `FromEnv`. However, when we "lower" Params, we don't update | |
181 | // the environment. | |
1b1a35ee XL |
182 | ty::Placeholder(..) => { |
183 | chalk_ir::GoalData::All(chalk_ir::Goals::empty(interner)) | |
3dfed10e | 184 | } |
1b1a35ee XL |
185 | |
186 | _ => chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::WellFormed( | |
187 | chalk_ir::WellFormed::Ty(ty.lower_into(interner)), | |
188 | )), | |
f035d41b XL |
189 | }, |
190 | // FIXME(chalk): handle well formed consts | |
191 | GenericArgKind::Const(..) => { | |
1b1a35ee | 192 | chalk_ir::GoalData::All(chalk_ir::Goals::empty(interner)) |
f9f354fc | 193 | } |
f2b60f7d | 194 | GenericArgKind::Lifetime(lt) => bug!("unexpected well formed predicate: {:?}", lt), |
f9f354fc XL |
195 | }, |
196 | ||
5869c6ff | 197 | ty::PredicateKind::ObjectSafe(t) => chalk_ir::GoalData::DomainGoal( |
3dfed10e | 198 | chalk_ir::DomainGoal::ObjectSafe(chalk_ir::TraitId(t)), |
f035d41b XL |
199 | ), |
200 | ||
5099ac24 FG |
201 | ty::PredicateKind::Subtype(ty::SubtypePredicate { a, b, a_is_expected: _ }) => { |
202 | chalk_ir::GoalData::SubtypeGoal(chalk_ir::SubtypeGoal { | |
203 | a: a.lower_into(interner), | |
204 | b: b.lower_into(interner), | |
205 | }) | |
206 | } | |
207 | ||
f9f354fc XL |
208 | // FIXME(chalk): other predicates |
209 | // | |
210 | // We can defer this, but ultimately we'll want to express | |
211 | // some of these in terms of chalk operations. | |
5869c6ff | 212 | ty::PredicateKind::ClosureKind(..) |
94222f64 | 213 | | ty::PredicateKind::Coerce(..) |
5869c6ff XL |
214 | | ty::PredicateKind::ConstEvaluatable(..) |
215 | | ty::PredicateKind::ConstEquate(..) => { | |
1b1a35ee | 216 | chalk_ir::GoalData::All(chalk_ir::Goals::empty(interner)) |
f9f354fc | 217 | } |
5869c6ff | 218 | ty::PredicateKind::TypeWellFormedFromEnv(ty) => chalk_ir::GoalData::DomainGoal( |
1b1a35ee XL |
219 | chalk_ir::DomainGoal::FromEnv(chalk_ir::FromEnv::Ty(ty.lower_into(interner))), |
220 | ), | |
221 | }; | |
222 | ||
223 | chalk_ir::GoalData::Quantified( | |
224 | chalk_ir::QuantifierKind::ForAll, | |
225 | chalk_ir::Binders::new(binders, value.intern(interner)), | |
226 | ) | |
f9f354fc XL |
227 | } |
228 | } | |
229 | ||
230 | impl<'tcx> LowerInto<'tcx, chalk_ir::TraitRef<RustInterner<'tcx>>> | |
231 | for rustc_middle::ty::TraitRef<'tcx> | |
232 | { | |
a2a8927a | 233 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::TraitRef<RustInterner<'tcx>> { |
f9f354fc | 234 | chalk_ir::TraitRef { |
f035d41b | 235 | trait_id: chalk_ir::TraitId(self.def_id), |
f9f354fc XL |
236 | substitution: self.substs.lower_into(interner), |
237 | } | |
238 | } | |
239 | } | |
240 | ||
f9f354fc XL |
241 | impl<'tcx> LowerInto<'tcx, chalk_ir::AliasEq<RustInterner<'tcx>>> |
242 | for rustc_middle::ty::ProjectionPredicate<'tcx> | |
243 | { | |
a2a8927a | 244 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::AliasEq<RustInterner<'tcx>> { |
5099ac24 | 245 | // FIXME(associated_const_equality): teach chalk about terms for alias eq. |
f9f354fc | 246 | chalk_ir::AliasEq { |
5099ac24 | 247 | ty: self.term.ty().unwrap().lower_into(interner), |
f9f354fc XL |
248 | alias: self.projection_ty.lower_into(interner), |
249 | } | |
250 | } | |
251 | } | |
252 | ||
5099ac24 FG |
253 | /* |
254 | // FIXME(...): Where do I add this to Chalk? I can't find it in the rustc repo anywhere. | |
255 | impl<'tcx> LowerInto<'tcx, chalk_ir::Term<RustInterner<'tcx>>> for rustc_middle::ty::Term<'tcx> { | |
256 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::Term<RustInterner<'tcx>> { | |
257 | match self { | |
258 | ty::Term::Ty(ty) => ty.lower_into(interner).into(), | |
259 | ty::Term::Const(c) => c.lower_into(interner).into(), | |
260 | } | |
261 | } | |
262 | } | |
263 | */ | |
264 | ||
f9f354fc | 265 | impl<'tcx> LowerInto<'tcx, chalk_ir::Ty<RustInterner<'tcx>>> for Ty<'tcx> { |
a2a8927a | 266 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::Ty<RustInterner<'tcx>> { |
29967ef6 XL |
267 | let int = |i| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Int(i)); |
268 | let uint = |i| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Uint(i)); | |
269 | let float = |f| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Float(f)); | |
f9f354fc | 270 | |
1b1a35ee | 271 | match *self.kind() { |
29967ef6 XL |
272 | ty::Bool => chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Bool), |
273 | ty::Char => chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Char), | |
274 | ty::Int(ty) => match ty { | |
5869c6ff XL |
275 | ty::IntTy::Isize => int(chalk_ir::IntTy::Isize), |
276 | ty::IntTy::I8 => int(chalk_ir::IntTy::I8), | |
277 | ty::IntTy::I16 => int(chalk_ir::IntTy::I16), | |
278 | ty::IntTy::I32 => int(chalk_ir::IntTy::I32), | |
279 | ty::IntTy::I64 => int(chalk_ir::IntTy::I64), | |
280 | ty::IntTy::I128 => int(chalk_ir::IntTy::I128), | |
f9f354fc | 281 | }, |
29967ef6 | 282 | ty::Uint(ty) => match ty { |
5869c6ff XL |
283 | ty::UintTy::Usize => uint(chalk_ir::UintTy::Usize), |
284 | ty::UintTy::U8 => uint(chalk_ir::UintTy::U8), | |
285 | ty::UintTy::U16 => uint(chalk_ir::UintTy::U16), | |
286 | ty::UintTy::U32 => uint(chalk_ir::UintTy::U32), | |
287 | ty::UintTy::U64 => uint(chalk_ir::UintTy::U64), | |
288 | ty::UintTy::U128 => uint(chalk_ir::UintTy::U128), | |
f9f354fc | 289 | }, |
29967ef6 | 290 | ty::Float(ty) => match ty { |
5869c6ff XL |
291 | ty::FloatTy::F32 => float(chalk_ir::FloatTy::F32), |
292 | ty::FloatTy::F64 => float(chalk_ir::FloatTy::F64), | |
f9f354fc | 293 | }, |
29967ef6 XL |
294 | ty::Adt(def, substs) => { |
295 | chalk_ir::TyKind::Adt(chalk_ir::AdtId(def), substs.lower_into(interner)) | |
f035d41b | 296 | } |
29967ef6 XL |
297 | ty::Foreign(def_id) => chalk_ir::TyKind::Foreign(ForeignDefId(def_id)), |
298 | ty::Str => chalk_ir::TyKind::Str, | |
299 | ty::Array(ty, len) => { | |
300 | chalk_ir::TyKind::Array(ty.lower_into(interner), len.lower_into(interner)) | |
f035d41b | 301 | } |
29967ef6 XL |
302 | ty::Slice(ty) => chalk_ir::TyKind::Slice(ty.lower_into(interner)), |
303 | ||
304 | ty::RawPtr(ptr) => { | |
305 | chalk_ir::TyKind::Raw(ptr.mutbl.lower_into(interner), ptr.ty.lower_into(interner)) | |
f035d41b | 306 | } |
29967ef6 XL |
307 | ty::Ref(region, ty, mutability) => chalk_ir::TyKind::Ref( |
308 | mutability.lower_into(interner), | |
309 | region.lower_into(interner), | |
310 | ty.lower_into(interner), | |
f9f354fc | 311 | ), |
29967ef6 XL |
312 | ty::FnDef(def_id, substs) => { |
313 | chalk_ir::TyKind::FnDef(chalk_ir::FnDefId(def_id), substs.lower_into(interner)) | |
314 | } | |
315 | ty::FnPtr(sig) => { | |
f9f354fc | 316 | let (inputs_and_outputs, binders, _named_regions) = |
fc512014 | 317 | collect_bound_vars(interner, interner.tcx, sig.inputs_and_output()); |
29967ef6 | 318 | chalk_ir::TyKind::Function(chalk_ir::FnPointer { |
f9f354fc | 319 | num_binders: binders.len(interner), |
1b1a35ee | 320 | sig: sig.lower_into(interner), |
5869c6ff | 321 | substitution: chalk_ir::FnSubst(chalk_ir::Substitution::from_iter( |
f9f354fc XL |
322 | interner, |
323 | inputs_and_outputs.iter().map(|ty| { | |
f035d41b | 324 | chalk_ir::GenericArgData::Ty(ty.lower_into(interner)).intern(interner) |
f9f354fc | 325 | }), |
5869c6ff | 326 | )), |
f9f354fc | 327 | }) |
f9f354fc | 328 | } |
f2b60f7d FG |
329 | // FIXME(dyn-star): handle the dynamic kind (dyn or dyn*) |
330 | ty::Dynamic(predicates, region, _kind) => chalk_ir::TyKind::Dyn(chalk_ir::DynTy { | |
f035d41b XL |
331 | bounds: predicates.lower_into(interner), |
332 | lifetime: region.lower_into(interner), | |
29967ef6 XL |
333 | }), |
334 | ty::Closure(def_id, substs) => { | |
335 | chalk_ir::TyKind::Closure(chalk_ir::ClosureId(def_id), substs.lower_into(interner)) | |
f9f354fc | 336 | } |
5e7ed085 FG |
337 | ty::Generator(def_id, substs, _) => chalk_ir::TyKind::Generator( |
338 | chalk_ir::GeneratorId(def_id), | |
339 | substs.lower_into(interner), | |
340 | ), | |
29967ef6 XL |
341 | ty::GeneratorWitness(_) => unimplemented!(), |
342 | ty::Never => chalk_ir::TyKind::Never, | |
5e7ed085 FG |
343 | ty::Tuple(types) => { |
344 | chalk_ir::TyKind::Tuple(types.len(), types.as_substs().lower_into(interner)) | |
345 | } | |
29967ef6 XL |
346 | ty::Projection(proj) => chalk_ir::TyKind::Alias(proj.lower_into(interner)), |
347 | ty::Opaque(def_id, substs) => { | |
348 | chalk_ir::TyKind::Alias(chalk_ir::AliasTy::Opaque(chalk_ir::OpaqueTy { | |
f035d41b XL |
349 | opaque_ty_id: chalk_ir::OpaqueTyId(def_id), |
350 | substitution: substs.lower_into(interner), | |
351 | })) | |
f035d41b | 352 | } |
f9f354fc XL |
353 | // This should have been done eagerly prior to this, and all Params |
354 | // should have been substituted to placeholders | |
29967ef6 XL |
355 | ty::Param(_) => panic!("Lowering Param when not expected."), |
356 | ty::Bound(db, bound) => chalk_ir::TyKind::BoundVar(chalk_ir::BoundVar::new( | |
f9f354fc XL |
357 | chalk_ir::DebruijnIndex::new(db.as_u32()), |
358 | bound.var.index(), | |
29967ef6 XL |
359 | )), |
360 | ty::Placeholder(_placeholder) => { | |
361 | chalk_ir::TyKind::Placeholder(chalk_ir::PlaceholderIndex { | |
362 | ui: chalk_ir::UniverseIndex { counter: _placeholder.universe.as_usize() }, | |
363 | idx: _placeholder.name.as_usize(), | |
364 | }) | |
365 | } | |
366 | ty::Infer(_infer) => unimplemented!(), | |
367 | ty::Error(_) => chalk_ir::TyKind::Error, | |
f9f354fc | 368 | } |
29967ef6 | 369 | .intern(interner) |
f9f354fc XL |
370 | } |
371 | } | |
372 | ||
1b1a35ee | 373 | impl<'tcx> LowerInto<'tcx, Ty<'tcx>> for &chalk_ir::Ty<RustInterner<'tcx>> { |
a2a8927a | 374 | fn lower_into(self, interner: RustInterner<'tcx>) -> Ty<'tcx> { |
29967ef6 | 375 | use chalk_ir::TyKind; |
1b1a35ee | 376 | |
29967ef6 XL |
377 | let kind = match self.kind(interner) { |
378 | TyKind::Adt(struct_id, substitution) => { | |
379 | ty::Adt(struct_id.0, substitution.lower_into(interner)) | |
380 | } | |
381 | TyKind::Scalar(scalar) => match scalar { | |
382 | chalk_ir::Scalar::Bool => ty::Bool, | |
383 | chalk_ir::Scalar::Char => ty::Char, | |
384 | chalk_ir::Scalar::Int(int_ty) => match int_ty { | |
5869c6ff XL |
385 | chalk_ir::IntTy::Isize => ty::Int(ty::IntTy::Isize), |
386 | chalk_ir::IntTy::I8 => ty::Int(ty::IntTy::I8), | |
387 | chalk_ir::IntTy::I16 => ty::Int(ty::IntTy::I16), | |
388 | chalk_ir::IntTy::I32 => ty::Int(ty::IntTy::I32), | |
389 | chalk_ir::IntTy::I64 => ty::Int(ty::IntTy::I64), | |
390 | chalk_ir::IntTy::I128 => ty::Int(ty::IntTy::I128), | |
29967ef6 XL |
391 | }, |
392 | chalk_ir::Scalar::Uint(int_ty) => match int_ty { | |
5869c6ff XL |
393 | chalk_ir::UintTy::Usize => ty::Uint(ty::UintTy::Usize), |
394 | chalk_ir::UintTy::U8 => ty::Uint(ty::UintTy::U8), | |
395 | chalk_ir::UintTy::U16 => ty::Uint(ty::UintTy::U16), | |
396 | chalk_ir::UintTy::U32 => ty::Uint(ty::UintTy::U32), | |
397 | chalk_ir::UintTy::U64 => ty::Uint(ty::UintTy::U64), | |
398 | chalk_ir::UintTy::U128 => ty::Uint(ty::UintTy::U128), | |
29967ef6 XL |
399 | }, |
400 | chalk_ir::Scalar::Float(float_ty) => match float_ty { | |
5869c6ff XL |
401 | chalk_ir::FloatTy::F32 => ty::Float(ty::FloatTy::F32), |
402 | chalk_ir::FloatTy::F64 => ty::Float(ty::FloatTy::F64), | |
1b1a35ee | 403 | }, |
1b1a35ee | 404 | }, |
29967ef6 XL |
405 | TyKind::Array(ty, c) => { |
406 | let ty = ty.lower_into(interner); | |
407 | let c = c.lower_into(interner); | |
5099ac24 | 408 | ty::Array(ty, c) |
29967ef6 XL |
409 | } |
410 | TyKind::FnDef(id, substitution) => ty::FnDef(id.0, substitution.lower_into(interner)), | |
411 | TyKind::Closure(closure, substitution) => { | |
412 | ty::Closure(closure.0, substitution.lower_into(interner)) | |
413 | } | |
414 | TyKind::Generator(..) => unimplemented!(), | |
415 | TyKind::GeneratorWitness(..) => unimplemented!(), | |
416 | TyKind::Never => ty::Never, | |
5e7ed085 FG |
417 | TyKind::Tuple(_len, substitution) => { |
418 | ty::Tuple(substitution.lower_into(interner).try_as_type_list().unwrap()) | |
419 | } | |
29967ef6 XL |
420 | TyKind::Slice(ty) => ty::Slice(ty.lower_into(interner)), |
421 | TyKind::Raw(mutbl, ty) => ty::RawPtr(ty::TypeAndMut { | |
422 | ty: ty.lower_into(interner), | |
423 | mutbl: mutbl.lower_into(interner), | |
424 | }), | |
425 | TyKind::Ref(mutbl, lifetime, ty) => ty::Ref( | |
426 | lifetime.lower_into(interner), | |
427 | ty.lower_into(interner), | |
428 | mutbl.lower_into(interner), | |
429 | ), | |
430 | TyKind::Str => ty::Str, | |
431 | TyKind::OpaqueType(opaque_ty, substitution) => { | |
432 | ty::Opaque(opaque_ty.0, substitution.lower_into(interner)) | |
433 | } | |
434 | TyKind::AssociatedType(assoc_ty, substitution) => ty::Projection(ty::ProjectionTy { | |
435 | substs: substitution.lower_into(interner), | |
436 | item_def_id: assoc_ty.0, | |
437 | }), | |
438 | TyKind::Foreign(def_id) => ty::Foreign(def_id.0), | |
439 | TyKind::Error => return interner.tcx.ty_error(), | |
440 | TyKind::Placeholder(placeholder) => ty::Placeholder(ty::Placeholder { | |
1b1a35ee XL |
441 | universe: ty::UniverseIndex::from_usize(placeholder.ui.counter), |
442 | name: ty::BoundVar::from_usize(placeholder.idx), | |
443 | }), | |
29967ef6 XL |
444 | TyKind::Alias(alias_ty) => match alias_ty { |
445 | chalk_ir::AliasTy::Projection(projection) => ty::Projection(ty::ProjectionTy { | |
446 | item_def_id: projection.associated_ty_id.0, | |
447 | substs: projection.substitution.lower_into(interner), | |
448 | }), | |
449 | chalk_ir::AliasTy::Opaque(opaque) => { | |
450 | ty::Opaque(opaque.opaque_ty_id.0, opaque.substitution.lower_into(interner)) | |
451 | } | |
452 | }, | |
453 | TyKind::Function(_quantified_ty) => unimplemented!(), | |
454 | TyKind::BoundVar(_bound) => ty::Bound( | |
1b1a35ee XL |
455 | ty::DebruijnIndex::from_usize(_bound.debruijn.depth() as usize), |
456 | ty::BoundTy { | |
457 | var: ty::BoundVar::from_usize(_bound.index), | |
458 | kind: ty::BoundTyKind::Anon, | |
459 | }, | |
460 | ), | |
29967ef6 XL |
461 | TyKind::InferenceVar(_, _) => unimplemented!(), |
462 | TyKind::Dyn(_) => unimplemented!(), | |
1b1a35ee XL |
463 | }; |
464 | interner.tcx.mk_ty(kind) | |
465 | } | |
466 | } | |
467 | ||
f9f354fc | 468 | impl<'tcx> LowerInto<'tcx, chalk_ir::Lifetime<RustInterner<'tcx>>> for Region<'tcx> { |
a2a8927a | 469 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::Lifetime<RustInterner<'tcx>> { |
5099ac24 FG |
470 | match *self { |
471 | ty::ReEarlyBound(_) => { | |
f9f354fc XL |
472 | panic!("Should have already been substituted."); |
473 | } | |
5099ac24 | 474 | ty::ReLateBound(db, br) => chalk_ir::LifetimeData::BoundVar(chalk_ir::BoundVar::new( |
cdc7bbd5 XL |
475 | chalk_ir::DebruijnIndex::new(db.as_u32()), |
476 | br.var.as_usize(), | |
477 | )) | |
478 | .intern(interner), | |
5099ac24 FG |
479 | ty::ReFree(_) => unimplemented!(), |
480 | ty::ReStatic => chalk_ir::LifetimeData::Static.intern(interner), | |
481 | ty::ReVar(_) => unimplemented!(), | |
482 | ty::RePlaceholder(placeholder_region) => { | |
f9f354fc XL |
483 | chalk_ir::LifetimeData::Placeholder(chalk_ir::PlaceholderIndex { |
484 | ui: chalk_ir::UniverseIndex { counter: placeholder_region.universe.index() }, | |
485 | idx: 0, | |
486 | }) | |
487 | .intern(interner) | |
488 | } | |
5099ac24 | 489 | ty::ReErased => chalk_ir::LifetimeData::Erased.intern(interner), |
f9f354fc XL |
490 | } |
491 | } | |
492 | } | |
493 | ||
1b1a35ee | 494 | impl<'tcx> LowerInto<'tcx, Region<'tcx>> for &chalk_ir::Lifetime<RustInterner<'tcx>> { |
a2a8927a | 495 | fn lower_into(self, interner: RustInterner<'tcx>) -> Region<'tcx> { |
1b1a35ee | 496 | let kind = match self.data(interner) { |
5099ac24 | 497 | chalk_ir::LifetimeData::BoundVar(var) => ty::ReLateBound( |
1b1a35ee | 498 | ty::DebruijnIndex::from_u32(var.debruijn.depth()), |
cdc7bbd5 XL |
499 | ty::BoundRegion { |
500 | var: ty::BoundVar::from_usize(var.index), | |
501 | kind: ty::BrAnon(var.index as u32), | |
502 | }, | |
1b1a35ee XL |
503 | ), |
504 | chalk_ir::LifetimeData::InferenceVar(_var) => unimplemented!(), | |
5099ac24 FG |
505 | chalk_ir::LifetimeData::Placeholder(p) => ty::RePlaceholder(ty::Placeholder { |
506 | universe: ty::UniverseIndex::from_usize(p.ui.counter), | |
507 | name: ty::BoundRegionKind::BrAnon(p.idx as u32), | |
508 | }), | |
509 | chalk_ir::LifetimeData::Static => return interner.tcx.lifetimes.re_static, | |
f2b60f7d FG |
510 | chalk_ir::LifetimeData::Empty(_) => { |
511 | bug!("Chalk should not have been passed an empty lifetime.") | |
5869c6ff | 512 | } |
5099ac24 FG |
513 | chalk_ir::LifetimeData::Erased => return interner.tcx.lifetimes.re_erased, |
514 | chalk_ir::LifetimeData::Phantom(void, _) => match *void {}, | |
1b1a35ee XL |
515 | }; |
516 | interner.tcx.mk_region(kind) | |
517 | } | |
518 | } | |
519 | ||
520 | impl<'tcx> LowerInto<'tcx, chalk_ir::Const<RustInterner<'tcx>>> for ty::Const<'tcx> { | |
a2a8927a | 521 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::Const<RustInterner<'tcx>> { |
5099ac24 | 522 | let ty = self.ty().lower_into(interner); |
923072b8 | 523 | let value = match self.kind() { |
1b1a35ee XL |
524 | ty::ConstKind::Value(val) => { |
525 | chalk_ir::ConstValue::Concrete(chalk_ir::ConcreteConst { interned: val }) | |
526 | } | |
527 | ty::ConstKind::Bound(db, bound) => chalk_ir::ConstValue::BoundVar( | |
528 | chalk_ir::BoundVar::new(chalk_ir::DebruijnIndex::new(db.as_u32()), bound.index()), | |
529 | ), | |
530 | _ => unimplemented!("Const not implemented. {:?}", self), | |
531 | }; | |
532 | chalk_ir::ConstData { ty, value }.intern(interner) | |
533 | } | |
534 | } | |
535 | ||
536 | impl<'tcx> LowerInto<'tcx, ty::Const<'tcx>> for &chalk_ir::Const<RustInterner<'tcx>> { | |
a2a8927a | 537 | fn lower_into(self, interner: RustInterner<'tcx>) -> ty::Const<'tcx> { |
1b1a35ee XL |
538 | let data = self.data(interner); |
539 | let ty = data.ty.lower_into(interner); | |
923072b8 | 540 | let kind = match data.value { |
1b1a35ee XL |
541 | chalk_ir::ConstValue::BoundVar(var) => ty::ConstKind::Bound( |
542 | ty::DebruijnIndex::from_u32(var.debruijn.depth()), | |
543 | ty::BoundVar::from_u32(var.index as u32), | |
544 | ), | |
545 | chalk_ir::ConstValue::InferenceVar(_var) => unimplemented!(), | |
546 | chalk_ir::ConstValue::Placeholder(_p) => unimplemented!(), | |
547 | chalk_ir::ConstValue::Concrete(c) => ty::ConstKind::Value(c.interned), | |
548 | }; | |
923072b8 | 549 | interner.tcx.mk_const(ty::ConstS { ty, kind }) |
1b1a35ee XL |
550 | } |
551 | } | |
552 | ||
f035d41b | 553 | impl<'tcx> LowerInto<'tcx, chalk_ir::GenericArg<RustInterner<'tcx>>> for GenericArg<'tcx> { |
a2a8927a | 554 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::GenericArg<RustInterner<'tcx>> { |
f9f354fc XL |
555 | match self.unpack() { |
556 | ty::subst::GenericArgKind::Type(ty) => { | |
f035d41b | 557 | chalk_ir::GenericArgData::Ty(ty.lower_into(interner)) |
f9f354fc XL |
558 | } |
559 | ty::subst::GenericArgKind::Lifetime(lifetime) => { | |
f035d41b | 560 | chalk_ir::GenericArgData::Lifetime(lifetime.lower_into(interner)) |
f9f354fc | 561 | } |
1b1a35ee XL |
562 | ty::subst::GenericArgKind::Const(c) => { |
563 | chalk_ir::GenericArgData::Const(c.lower_into(interner)) | |
564 | } | |
f9f354fc XL |
565 | } |
566 | .intern(interner) | |
567 | } | |
568 | } | |
569 | ||
1b1a35ee XL |
570 | impl<'tcx> LowerInto<'tcx, ty::subst::GenericArg<'tcx>> |
571 | for &chalk_ir::GenericArg<RustInterner<'tcx>> | |
572 | { | |
a2a8927a | 573 | fn lower_into(self, interner: RustInterner<'tcx>) -> ty::subst::GenericArg<'tcx> { |
1b1a35ee XL |
574 | match self.data(interner) { |
575 | chalk_ir::GenericArgData::Ty(ty) => { | |
576 | let t: Ty<'tcx> = ty.lower_into(interner); | |
577 | t.into() | |
578 | } | |
579 | chalk_ir::GenericArgData::Lifetime(lifetime) => { | |
580 | let r: Region<'tcx> = lifetime.lower_into(interner); | |
581 | r.into() | |
582 | } | |
583 | chalk_ir::GenericArgData::Const(c) => { | |
584 | let c: ty::Const<'tcx> = c.lower_into(interner); | |
5099ac24 | 585 | c.into() |
1b1a35ee XL |
586 | } |
587 | } | |
588 | } | |
589 | } | |
590 | ||
f9f354fc XL |
591 | // We lower into an Option here since there are some predicates which Chalk |
592 | // doesn't have a representation for yet (as a `WhereClause`), but are so common | |
593 | // that we just are accepting the unsoundness for now. The `Option` will | |
594 | // eventually be removed. | |
595 | impl<'tcx> LowerInto<'tcx, Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>> | |
596 | for ty::Predicate<'tcx> | |
597 | { | |
598 | fn lower_into( | |
599 | self, | |
a2a8927a | 600 | interner: RustInterner<'tcx>, |
f9f354fc | 601 | ) -> Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>> { |
5869c6ff XL |
602 | let (predicate, binders, _named_regions) = |
603 | collect_bound_vars(interner, interner.tcx, self.kind()); | |
1b1a35ee | 604 | let value = match predicate { |
94222f64 | 605 | ty::PredicateKind::Trait(predicate) => { |
1b1a35ee | 606 | Some(chalk_ir::WhereClause::Implemented(predicate.trait_ref.lower_into(interner))) |
f9f354fc | 607 | } |
5869c6ff | 608 | ty::PredicateKind::RegionOutlives(predicate) => { |
1b1a35ee XL |
609 | Some(chalk_ir::WhereClause::LifetimeOutlives(chalk_ir::LifetimeOutlives { |
610 | a: predicate.0.lower_into(interner), | |
611 | b: predicate.1.lower_into(interner), | |
612 | })) | |
613 | } | |
5869c6ff | 614 | ty::PredicateKind::TypeOutlives(predicate) => { |
1b1a35ee XL |
615 | Some(chalk_ir::WhereClause::TypeOutlives(chalk_ir::TypeOutlives { |
616 | ty: predicate.0.lower_into(interner), | |
617 | lifetime: predicate.1.lower_into(interner), | |
618 | })) | |
619 | } | |
5869c6ff | 620 | ty::PredicateKind::Projection(predicate) => { |
1b1a35ee | 621 | Some(chalk_ir::WhereClause::AliasEq(predicate.lower_into(interner))) |
f035d41b | 622 | } |
5869c6ff | 623 | ty::PredicateKind::WellFormed(_ty) => None, |
3dfed10e | 624 | |
5869c6ff XL |
625 | ty::PredicateKind::ObjectSafe(..) |
626 | | ty::PredicateKind::ClosureKind(..) | |
627 | | ty::PredicateKind::Subtype(..) | |
94222f64 | 628 | | ty::PredicateKind::Coerce(..) |
5869c6ff XL |
629 | | ty::PredicateKind::ConstEvaluatable(..) |
630 | | ty::PredicateKind::ConstEquate(..) | |
631 | | ty::PredicateKind::TypeWellFormedFromEnv(..) => { | |
1b1a35ee XL |
632 | bug!("unexpected predicate {}", &self) |
633 | } | |
634 | }; | |
635 | value.map(|value| chalk_ir::Binders::new(binders, value)) | |
f9f354fc XL |
636 | } |
637 | } | |
638 | ||
f035d41b | 639 | impl<'tcx> LowerInto<'tcx, chalk_ir::Binders<chalk_ir::QuantifiedWhereClauses<RustInterner<'tcx>>>> |
cdc7bbd5 | 640 | for &'tcx ty::List<ty::Binder<'tcx, ty::ExistentialPredicate<'tcx>>> |
f035d41b XL |
641 | { |
642 | fn lower_into( | |
643 | self, | |
a2a8927a | 644 | interner: RustInterner<'tcx>, |
f035d41b | 645 | ) -> chalk_ir::Binders<chalk_ir::QuantifiedWhereClauses<RustInterner<'tcx>>> { |
29967ef6 XL |
646 | // `Self` has one binder: |
647 | // Binder<&'tcx ty::List<ty::ExistentialPredicate<'tcx>>> | |
648 | // The return type has two: | |
649 | // Binders<&[Binders<WhereClause<I>>]> | |
650 | // This means that any variables that are escaping `self` need to be | |
651 | // shifted in by one so that they are still escaping. | |
fc512014 | 652 | let predicates = ty::fold::shift_vars(interner.tcx, self, 1); |
29967ef6 | 653 | |
1b1a35ee XL |
654 | let self_ty = interner.tcx.mk_ty(ty::Bound( |
655 | // This is going to be wrapped in a binder | |
656 | ty::DebruijnIndex::from_usize(1), | |
657 | ty::BoundTy { var: ty::BoundVar::from_usize(0), kind: ty::BoundTyKind::Anon }, | |
658 | )); | |
fc512014 XL |
659 | let where_clauses = predicates.into_iter().map(|predicate| { |
660 | let (predicate, binders, _named_regions) = | |
661 | collect_bound_vars(interner, interner.tcx, predicate); | |
662 | match predicate { | |
663 | ty::ExistentialPredicate::Trait(ty::ExistentialTraitRef { def_id, substs }) => { | |
664 | chalk_ir::Binders::new( | |
665 | binders.clone(), | |
666 | chalk_ir::WhereClause::Implemented(chalk_ir::TraitRef { | |
667 | trait_id: chalk_ir::TraitId(def_id), | |
668 | substitution: interner | |
669 | .tcx | |
670 | .mk_substs_trait(self_ty, substs) | |
671 | .lower_into(interner), | |
672 | }), | |
673 | ) | |
674 | } | |
675 | ty::ExistentialPredicate::Projection(predicate) => chalk_ir::Binders::new( | |
676 | binders.clone(), | |
677 | chalk_ir::WhereClause::AliasEq(chalk_ir::AliasEq { | |
678 | alias: chalk_ir::AliasTy::Projection(chalk_ir::ProjectionTy { | |
679 | associated_ty_id: chalk_ir::AssocTypeId(predicate.item_def_id), | |
680 | substitution: interner | |
681 | .tcx | |
682 | .mk_substs_trait(self_ty, predicate.substs) | |
683 | .lower_into(interner), | |
684 | }), | |
5099ac24 FG |
685 | // FIXME(associated_const_equality): teach chalk about terms for alias eq. |
686 | ty: predicate.term.ty().unwrap().lower_into(interner), | |
fc512014 XL |
687 | }), |
688 | ), | |
689 | ty::ExistentialPredicate::AutoTrait(def_id) => chalk_ir::Binders::new( | |
29967ef6 | 690 | binders.clone(), |
f035d41b XL |
691 | chalk_ir::WhereClause::Implemented(chalk_ir::TraitRef { |
692 | trait_id: chalk_ir::TraitId(def_id), | |
1b1a35ee XL |
693 | substitution: interner |
694 | .tcx | |
fc512014 | 695 | .mk_substs_trait(self_ty, &[]) |
1b1a35ee | 696 | .lower_into(interner), |
f035d41b | 697 | }), |
fc512014 | 698 | ), |
f035d41b | 699 | } |
f035d41b | 700 | }); |
29967ef6 XL |
701 | |
702 | // Binder for the bound variable representing the concrete underlying type. | |
703 | let existential_binder = chalk_ir::VariableKinds::from1( | |
704 | interner, | |
705 | chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General), | |
706 | ); | |
1b1a35ee | 707 | let value = chalk_ir::QuantifiedWhereClauses::from_iter(interner, where_clauses); |
29967ef6 | 708 | chalk_ir::Binders::new(existential_binder, value) |
f035d41b XL |
709 | } |
710 | } | |
711 | ||
cdc7bbd5 XL |
712 | impl<'tcx> LowerInto<'tcx, chalk_ir::FnSig<RustInterner<'tcx>>> |
713 | for ty::Binder<'tcx, ty::FnSig<'tcx>> | |
714 | { | |
a2a8927a | 715 | fn lower_into(self, _interner: RustInterner<'_>) -> FnSig<RustInterner<'tcx>> { |
1b1a35ee XL |
716 | chalk_ir::FnSig { |
717 | abi: self.abi(), | |
718 | safety: match self.unsafety() { | |
719 | Unsafety::Normal => chalk_ir::Safety::Safe, | |
720 | Unsafety::Unsafe => chalk_ir::Safety::Unsafe, | |
721 | }, | |
722 | variadic: self.c_variadic(), | |
723 | } | |
724 | } | |
725 | } | |
726 | ||
29967ef6 XL |
727 | // We lower into an Option here since there are some predicates which Chalk |
728 | // doesn't have a representation for yet (as an `InlineBound`). The `Option` will | |
729 | // eventually be removed. | |
730 | impl<'tcx> LowerInto<'tcx, Option<chalk_solve::rust_ir::QuantifiedInlineBound<RustInterner<'tcx>>>> | |
731 | for ty::Predicate<'tcx> | |
732 | { | |
733 | fn lower_into( | |
734 | self, | |
a2a8927a | 735 | interner: RustInterner<'tcx>, |
29967ef6 | 736 | ) -> Option<chalk_solve::rust_ir::QuantifiedInlineBound<RustInterner<'tcx>>> { |
5869c6ff XL |
737 | let (predicate, binders, _named_regions) = |
738 | collect_bound_vars(interner, interner.tcx, self.kind()); | |
29967ef6 | 739 | match predicate { |
94222f64 | 740 | ty::PredicateKind::Trait(predicate) => Some(chalk_ir::Binders::new( |
29967ef6 XL |
741 | binders, |
742 | chalk_solve::rust_ir::InlineBound::TraitBound( | |
743 | predicate.trait_ref.lower_into(interner), | |
744 | ), | |
745 | )), | |
5869c6ff | 746 | ty::PredicateKind::Projection(predicate) => Some(chalk_ir::Binders::new( |
29967ef6 XL |
747 | binders, |
748 | chalk_solve::rust_ir::InlineBound::AliasEqBound(predicate.lower_into(interner)), | |
749 | )), | |
5869c6ff XL |
750 | ty::PredicateKind::TypeOutlives(_predicate) => None, |
751 | ty::PredicateKind::WellFormed(_ty) => None, | |
752 | ||
753 | ty::PredicateKind::RegionOutlives(..) | |
754 | | ty::PredicateKind::ObjectSafe(..) | |
755 | | ty::PredicateKind::ClosureKind(..) | |
756 | | ty::PredicateKind::Subtype(..) | |
94222f64 | 757 | | ty::PredicateKind::Coerce(..) |
5869c6ff XL |
758 | | ty::PredicateKind::ConstEvaluatable(..) |
759 | | ty::PredicateKind::ConstEquate(..) | |
760 | | ty::PredicateKind::TypeWellFormedFromEnv(..) => { | |
29967ef6 XL |
761 | bug!("unexpected predicate {}", &self) |
762 | } | |
763 | } | |
764 | } | |
765 | } | |
766 | ||
767 | impl<'tcx> LowerInto<'tcx, chalk_solve::rust_ir::TraitBound<RustInterner<'tcx>>> | |
768 | for ty::TraitRef<'tcx> | |
769 | { | |
770 | fn lower_into( | |
771 | self, | |
a2a8927a | 772 | interner: RustInterner<'tcx>, |
29967ef6 XL |
773 | ) -> chalk_solve::rust_ir::TraitBound<RustInterner<'tcx>> { |
774 | chalk_solve::rust_ir::TraitBound { | |
775 | trait_id: chalk_ir::TraitId(self.def_id), | |
776 | args_no_self: self.substs[1..].iter().map(|arg| arg.lower_into(interner)).collect(), | |
777 | } | |
778 | } | |
779 | } | |
780 | ||
781 | impl<'tcx> LowerInto<'tcx, chalk_ir::Mutability> for ast::Mutability { | |
a2a8927a | 782 | fn lower_into(self, _interner: RustInterner<'tcx>) -> chalk_ir::Mutability { |
29967ef6 XL |
783 | match self { |
784 | rustc_ast::Mutability::Mut => chalk_ir::Mutability::Mut, | |
785 | rustc_ast::Mutability::Not => chalk_ir::Mutability::Not, | |
786 | } | |
787 | } | |
788 | } | |
789 | ||
790 | impl<'tcx> LowerInto<'tcx, ast::Mutability> for chalk_ir::Mutability { | |
a2a8927a | 791 | fn lower_into(self, _interner: RustInterner<'tcx>) -> ast::Mutability { |
29967ef6 XL |
792 | match self { |
793 | chalk_ir::Mutability::Mut => ast::Mutability::Mut, | |
794 | chalk_ir::Mutability::Not => ast::Mutability::Not, | |
795 | } | |
796 | } | |
797 | } | |
798 | ||
799 | impl<'tcx> LowerInto<'tcx, chalk_solve::rust_ir::Polarity> for ty::ImplPolarity { | |
a2a8927a | 800 | fn lower_into(self, _interner: RustInterner<'tcx>) -> chalk_solve::rust_ir::Polarity { |
29967ef6 XL |
801 | match self { |
802 | ty::ImplPolarity::Positive => chalk_solve::rust_ir::Polarity::Positive, | |
803 | ty::ImplPolarity::Negative => chalk_solve::rust_ir::Polarity::Negative, | |
804 | // FIXME(chalk) reservation impls | |
805 | ty::ImplPolarity::Reservation => chalk_solve::rust_ir::Polarity::Negative, | |
806 | } | |
807 | } | |
808 | } | |
5099ac24 FG |
809 | impl<'tcx> LowerInto<'tcx, chalk_ir::Variance> for ty::Variance { |
810 | fn lower_into(self, _interner: RustInterner<'tcx>) -> chalk_ir::Variance { | |
811 | match self { | |
812 | ty::Variance::Covariant => chalk_ir::Variance::Covariant, | |
813 | ty::Variance::Invariant => chalk_ir::Variance::Invariant, | |
814 | ty::Variance::Contravariant => chalk_ir::Variance::Contravariant, | |
815 | ty::Variance::Bivariant => unimplemented!(), | |
816 | } | |
817 | } | |
818 | } | |
29967ef6 XL |
819 | |
820 | impl<'tcx> LowerInto<'tcx, chalk_solve::rust_ir::AliasEqBound<RustInterner<'tcx>>> | |
821 | for ty::ProjectionPredicate<'tcx> | |
822 | { | |
823 | fn lower_into( | |
824 | self, | |
a2a8927a | 825 | interner: RustInterner<'tcx>, |
29967ef6 | 826 | ) -> chalk_solve::rust_ir::AliasEqBound<RustInterner<'tcx>> { |
6a06907d | 827 | let (trait_ref, own_substs) = self.projection_ty.trait_ref_and_own_substs(interner.tcx); |
29967ef6 XL |
828 | chalk_solve::rust_ir::AliasEqBound { |
829 | trait_bound: trait_ref.lower_into(interner), | |
830 | associated_ty_id: chalk_ir::AssocTypeId(self.projection_ty.item_def_id), | |
6a06907d | 831 | parameters: own_substs.iter().map(|arg| arg.lower_into(interner)).collect(), |
5099ac24 | 832 | value: self.term.ty().unwrap().lower_into(interner), |
29967ef6 XL |
833 | } |
834 | } | |
835 | } | |
836 | ||
f9f354fc | 837 | /// To collect bound vars, we have to do two passes. In the first pass, we |
fc512014 | 838 | /// collect all `BoundRegionKind`s and `ty::Bound`s. In the second pass, we then |
f9f354fc XL |
839 | /// replace `BrNamed` into `BrAnon`. The two separate passes are important, |
840 | /// since we can only replace `BrNamed` with `BrAnon`s with indices *after* all | |
841 | /// "real" `BrAnon`s. | |
842 | /// | |
843 | /// It's important to note that because of prior substitution, we may have | |
844 | /// late-bound regions, even outside of fn contexts, since this is the best way | |
845 | /// to prep types for chalk lowering. | |
923072b8 | 846 | pub(crate) fn collect_bound_vars<'tcx, T: TypeFoldable<'tcx>>( |
a2a8927a | 847 | interner: RustInterner<'tcx>, |
f9f354fc | 848 | tcx: TyCtxt<'tcx>, |
cdc7bbd5 | 849 | ty: Binder<'tcx, T>, |
f035d41b | 850 | ) -> (T, chalk_ir::VariableKinds<RustInterner<'tcx>>, BTreeMap<DefId, u32>) { |
5099ac24 | 851 | let mut bound_vars_collector = BoundVarsCollector::new(); |
f035d41b | 852 | ty.as_ref().skip_binder().visit_with(&mut bound_vars_collector); |
f9f354fc XL |
853 | let mut parameters = bound_vars_collector.parameters; |
854 | let named_parameters: BTreeMap<DefId, u32> = bound_vars_collector | |
855 | .named_parameters | |
856 | .into_iter() | |
857 | .enumerate() | |
858 | .map(|(i, def_id)| (def_id, (i + parameters.len()) as u32)) | |
859 | .collect(); | |
860 | ||
861 | let mut bound_var_substitutor = NamedBoundVarSubstitutor::new(tcx, &named_parameters); | |
fc512014 | 862 | let new_ty = ty.skip_binder().fold_with(&mut bound_var_substitutor); |
f9f354fc XL |
863 | |
864 | for var in named_parameters.values() { | |
f035d41b | 865 | parameters.insert(*var, chalk_ir::VariableKind::Lifetime); |
f9f354fc XL |
866 | } |
867 | ||
868 | (0..parameters.len()).for_each(|i| { | |
3dfed10e XL |
869 | parameters |
870 | .get(&(i as u32)) | |
fc512014 | 871 | .or_else(|| bug!("Skipped bound var index: parameters={:?}", parameters)); |
f9f354fc XL |
872 | }); |
873 | ||
1b1a35ee XL |
874 | let binders = |
875 | chalk_ir::VariableKinds::from_iter(interner, parameters.into_iter().map(|(_, v)| v)); | |
f9f354fc XL |
876 | |
877 | (new_ty, binders, named_parameters) | |
878 | } | |
879 | ||
923072b8 | 880 | pub(crate) struct BoundVarsCollector<'tcx> { |
f9f354fc | 881 | binder_index: ty::DebruijnIndex, |
923072b8 FG |
882 | pub(crate) parameters: BTreeMap<u32, chalk_ir::VariableKind<RustInterner<'tcx>>>, |
883 | pub(crate) named_parameters: Vec<DefId>, | |
f9f354fc XL |
884 | } |
885 | ||
f035d41b | 886 | impl<'tcx> BoundVarsCollector<'tcx> { |
923072b8 | 887 | pub(crate) fn new() -> Self { |
f9f354fc XL |
888 | BoundVarsCollector { |
889 | binder_index: ty::INNERMOST, | |
890 | parameters: BTreeMap::new(), | |
891 | named_parameters: vec![], | |
892 | } | |
893 | } | |
894 | } | |
895 | ||
f035d41b | 896 | impl<'tcx> TypeVisitor<'tcx> for BoundVarsCollector<'tcx> { |
064997fb | 897 | fn visit_binder<T: TypeVisitable<'tcx>>( |
cdc7bbd5 XL |
898 | &mut self, |
899 | t: &Binder<'tcx, T>, | |
900 | ) -> ControlFlow<Self::BreakTy> { | |
f9f354fc XL |
901 | self.binder_index.shift_in(1); |
902 | let result = t.super_visit_with(self); | |
903 | self.binder_index.shift_out(1); | |
904 | result | |
905 | } | |
906 | ||
fc512014 | 907 | fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> { |
1b1a35ee | 908 | match *t.kind() { |
f9f354fc XL |
909 | ty::Bound(debruijn, bound_ty) if debruijn == self.binder_index => { |
910 | match self.parameters.entry(bound_ty.var.as_u32()) { | |
911 | Entry::Vacant(entry) => { | |
29967ef6 | 912 | entry.insert(chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General)); |
f9f354fc | 913 | } |
f035d41b XL |
914 | Entry::Occupied(entry) => match entry.get() { |
915 | chalk_ir::VariableKind::Ty(_) => {} | |
916 | _ => panic!(), | |
917 | }, | |
f9f354fc XL |
918 | } |
919 | } | |
920 | ||
921 | _ => (), | |
922 | }; | |
923 | ||
924 | t.super_visit_with(self) | |
925 | } | |
926 | ||
fc512014 | 927 | fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> { |
5099ac24 FG |
928 | match *r { |
929 | ty::ReLateBound(index, br) if index == self.binder_index => match br.kind { | |
fc512014 | 930 | ty::BoundRegionKind::BrNamed(def_id, _name) => { |
c295e0f8 | 931 | if !self.named_parameters.iter().any(|d| *d == def_id) { |
fc512014 | 932 | self.named_parameters.push(def_id); |
f9f354fc XL |
933 | } |
934 | } | |
935 | ||
fc512014 | 936 | ty::BoundRegionKind::BrAnon(var) => match self.parameters.entry(var) { |
f9f354fc | 937 | Entry::Vacant(entry) => { |
f035d41b | 938 | entry.insert(chalk_ir::VariableKind::Lifetime); |
f9f354fc | 939 | } |
f035d41b XL |
940 | Entry::Occupied(entry) => match entry.get() { |
941 | chalk_ir::VariableKind::Lifetime => {} | |
942 | _ => panic!(), | |
943 | }, | |
f9f354fc XL |
944 | }, |
945 | ||
cdc7bbd5 | 946 | ty::BoundRegionKind::BrEnv => unimplemented!(), |
f9f354fc XL |
947 | }, |
948 | ||
949 | ty::ReEarlyBound(_re) => { | |
950 | // FIXME(chalk): jackh726 - I think we should always have already | |
951 | // substituted away `ReEarlyBound`s for `ReLateBound`s, but need to confirm. | |
952 | unimplemented!(); | |
953 | } | |
954 | ||
955 | _ => (), | |
956 | }; | |
957 | ||
958 | r.super_visit_with(self) | |
959 | } | |
960 | } | |
961 | ||
fc512014 | 962 | /// This is used to replace `BoundRegionKind::BrNamed` with `BoundRegionKind::BrAnon`. |
f9f354fc XL |
963 | /// Note: we assume that we will always have room for more bound vars. (i.e. we |
964 | /// won't ever hit the `u32` limit in `BrAnon`s). | |
965 | struct NamedBoundVarSubstitutor<'a, 'tcx> { | |
966 | tcx: TyCtxt<'tcx>, | |
967 | binder_index: ty::DebruijnIndex, | |
968 | named_parameters: &'a BTreeMap<DefId, u32>, | |
969 | } | |
970 | ||
971 | impl<'a, 'tcx> NamedBoundVarSubstitutor<'a, 'tcx> { | |
972 | fn new(tcx: TyCtxt<'tcx>, named_parameters: &'a BTreeMap<DefId, u32>) -> Self { | |
973 | NamedBoundVarSubstitutor { tcx, binder_index: ty::INNERMOST, named_parameters } | |
974 | } | |
975 | } | |
976 | ||
977 | impl<'a, 'tcx> TypeFolder<'tcx> for NamedBoundVarSubstitutor<'a, 'tcx> { | |
978 | fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { | |
979 | self.tcx | |
980 | } | |
981 | ||
cdc7bbd5 | 982 | fn fold_binder<T: TypeFoldable<'tcx>>(&mut self, t: Binder<'tcx, T>) -> Binder<'tcx, T> { |
f9f354fc XL |
983 | self.binder_index.shift_in(1); |
984 | let result = t.super_fold_with(self); | |
985 | self.binder_index.shift_out(1); | |
986 | result | |
987 | } | |
988 | ||
f9f354fc | 989 | fn fold_region(&mut self, r: Region<'tcx>) -> Region<'tcx> { |
5099ac24 FG |
990 | match *r { |
991 | ty::ReLateBound(index, br) if index == self.binder_index => match br.kind { | |
fc512014 XL |
992 | ty::BrNamed(def_id, _name) => match self.named_parameters.get(&def_id) { |
993 | Some(idx) => { | |
cdc7bbd5 | 994 | let new_br = ty::BoundRegion { var: br.var, kind: ty::BrAnon(*idx) }; |
5099ac24 | 995 | return self.tcx.mk_region(ty::ReLateBound(index, new_br)); |
f9f354fc | 996 | } |
fc512014 XL |
997 | None => panic!("Missing `BrNamed`."), |
998 | }, | |
f9f354fc | 999 | ty::BrEnv => unimplemented!(), |
fc512014 | 1000 | ty::BrAnon(_) => {} |
f9f354fc XL |
1001 | }, |
1002 | _ => (), | |
1003 | }; | |
1004 | ||
1005 | r.super_fold_with(self) | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | /// Used to substitute `Param`s with placeholders. We do this since Chalk | |
1010 | /// have a notion of `Param`s. | |
923072b8 | 1011 | pub(crate) struct ParamsSubstitutor<'tcx> { |
f9f354fc XL |
1012 | tcx: TyCtxt<'tcx>, |
1013 | binder_index: ty::DebruijnIndex, | |
1014 | list: Vec<rustc_middle::ty::ParamTy>, | |
1b1a35ee | 1015 | next_ty_placeholder: usize, |
923072b8 FG |
1016 | pub(crate) params: rustc_data_structures::fx::FxHashMap<usize, rustc_middle::ty::ParamTy>, |
1017 | pub(crate) named_regions: BTreeMap<DefId, u32>, | |
f9f354fc XL |
1018 | } |
1019 | ||
1020 | impl<'tcx> ParamsSubstitutor<'tcx> { | |
923072b8 | 1021 | pub(crate) fn new(tcx: TyCtxt<'tcx>, next_ty_placeholder: usize) -> Self { |
f9f354fc XL |
1022 | ParamsSubstitutor { |
1023 | tcx, | |
1024 | binder_index: ty::INNERMOST, | |
1025 | list: vec![], | |
1b1a35ee | 1026 | next_ty_placeholder, |
f9f354fc XL |
1027 | params: rustc_data_structures::fx::FxHashMap::default(), |
1028 | named_regions: BTreeMap::default(), | |
1029 | } | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | impl<'tcx> TypeFolder<'tcx> for ParamsSubstitutor<'tcx> { | |
1034 | fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { | |
1035 | self.tcx | |
1036 | } | |
1037 | ||
cdc7bbd5 | 1038 | fn fold_binder<T: TypeFoldable<'tcx>>(&mut self, t: Binder<'tcx, T>) -> Binder<'tcx, T> { |
f9f354fc XL |
1039 | self.binder_index.shift_in(1); |
1040 | let result = t.super_fold_with(self); | |
1041 | self.binder_index.shift_out(1); | |
1042 | result | |
1043 | } | |
1044 | ||
1045 | fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> { | |
1b1a35ee | 1046 | match *t.kind() { |
f9f354fc | 1047 | ty::Param(param) => match self.list.iter().position(|r| r == ¶m) { |
1b1a35ee | 1048 | Some(idx) => self.tcx.mk_ty(ty::Placeholder(ty::PlaceholderType { |
f9f354fc | 1049 | universe: ty::UniverseIndex::from_usize(0), |
1b1a35ee | 1050 | name: ty::BoundVar::from_usize(idx), |
f9f354fc XL |
1051 | })), |
1052 | None => { | |
1053 | self.list.push(param); | |
1b1a35ee | 1054 | let idx = self.list.len() - 1 + self.next_ty_placeholder; |
f9f354fc XL |
1055 | self.params.insert(idx, param); |
1056 | self.tcx.mk_ty(ty::Placeholder(ty::PlaceholderType { | |
1057 | universe: ty::UniverseIndex::from_usize(0), | |
1058 | name: ty::BoundVar::from_usize(idx), | |
1059 | })) | |
1060 | } | |
1061 | }, | |
f9f354fc XL |
1062 | _ => t.super_fold_with(self), |
1063 | } | |
1064 | } | |
1065 | ||
1066 | fn fold_region(&mut self, r: Region<'tcx>) -> Region<'tcx> { | |
5099ac24 FG |
1067 | match *r { |
1068 | // FIXME(chalk) - jackh726 - this currently isn't hit in any tests, | |
1069 | // since canonicalization will already change these to canonical | |
1070 | // variables (ty::ReLateBound). | |
f9f354fc | 1071 | ty::ReEarlyBound(_re) => match self.named_regions.get(&_re.def_id) { |
fc512014 | 1072 | Some(idx) => { |
cdc7bbd5 XL |
1073 | let br = ty::BoundRegion { |
1074 | var: ty::BoundVar::from_u32(*idx), | |
1075 | kind: ty::BrAnon(*idx), | |
1076 | }; | |
5099ac24 | 1077 | self.tcx.mk_region(ty::ReLateBound(self.binder_index, br)) |
fc512014 | 1078 | } |
f9f354fc XL |
1079 | None => { |
1080 | let idx = self.named_regions.len() as u32; | |
cdc7bbd5 XL |
1081 | let br = |
1082 | ty::BoundRegion { var: ty::BoundVar::from_u32(idx), kind: ty::BrAnon(idx) }; | |
f9f354fc | 1083 | self.named_regions.insert(_re.def_id, idx); |
5099ac24 | 1084 | self.tcx.mk_region(ty::ReLateBound(self.binder_index, br)) |
f9f354fc XL |
1085 | } |
1086 | }, | |
1087 | ||
1088 | _ => r.super_fold_with(self), | |
1089 | } | |
1090 | } | |
1091 | } | |
1b1a35ee | 1092 | |
923072b8 | 1093 | pub(crate) struct ReverseParamsSubstitutor<'tcx> { |
5099ac24 FG |
1094 | tcx: TyCtxt<'tcx>, |
1095 | params: rustc_data_structures::fx::FxHashMap<usize, rustc_middle::ty::ParamTy>, | |
1096 | } | |
1097 | ||
1098 | impl<'tcx> ReverseParamsSubstitutor<'tcx> { | |
923072b8 | 1099 | pub(crate) fn new( |
5099ac24 FG |
1100 | tcx: TyCtxt<'tcx>, |
1101 | params: rustc_data_structures::fx::FxHashMap<usize, rustc_middle::ty::ParamTy>, | |
1102 | ) -> Self { | |
1103 | Self { tcx, params } | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | impl<'tcx> TypeFolder<'tcx> for ReverseParamsSubstitutor<'tcx> { | |
1108 | fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { | |
1109 | self.tcx | |
1110 | } | |
1111 | ||
1112 | fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> { | |
1113 | match *t.kind() { | |
1114 | ty::Placeholder(ty::PlaceholderType { universe: ty::UniverseIndex::ROOT, name }) => { | |
1115 | match self.params.get(&name.as_usize()) { | |
1116 | Some(param) => self.tcx.mk_ty(ty::Param(*param)), | |
1117 | None => t, | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | _ => t.super_fold_with(self), | |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | ||
1b1a35ee | 1126 | /// Used to collect `Placeholder`s. |
923072b8 | 1127 | pub(crate) struct PlaceholdersCollector { |
1b1a35ee | 1128 | universe_index: ty::UniverseIndex, |
923072b8 FG |
1129 | pub(crate) next_ty_placeholder: usize, |
1130 | pub(crate) next_anon_region_placeholder: u32, | |
1b1a35ee XL |
1131 | } |
1132 | ||
1133 | impl PlaceholdersCollector { | |
923072b8 | 1134 | pub(crate) fn new() -> Self { |
1b1a35ee XL |
1135 | PlaceholdersCollector { |
1136 | universe_index: ty::UniverseIndex::ROOT, | |
1137 | next_ty_placeholder: 0, | |
1138 | next_anon_region_placeholder: 0, | |
1139 | } | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | impl<'tcx> TypeVisitor<'tcx> for PlaceholdersCollector { | |
fc512014 | 1144 | fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> { |
1b1a35ee XL |
1145 | match t.kind() { |
1146 | ty::Placeholder(p) if p.universe == self.universe_index => { | |
1147 | self.next_ty_placeholder = self.next_ty_placeholder.max(p.name.as_usize() + 1); | |
1148 | } | |
1149 | ||
1150 | _ => (), | |
1151 | }; | |
1152 | ||
1153 | t.super_visit_with(self) | |
1154 | } | |
1155 | ||
fc512014 | 1156 | fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> { |
5099ac24 | 1157 | match *r { |
1b1a35ee | 1158 | ty::RePlaceholder(p) if p.universe == self.universe_index => { |
fc512014 | 1159 | if let ty::BoundRegionKind::BrAnon(anon) = p.name { |
1b1a35ee XL |
1160 | self.next_anon_region_placeholder = self.next_anon_region_placeholder.max(anon); |
1161 | } | |
1162 | } | |
1163 | ||
1164 | _ => (), | |
1165 | }; | |
1166 | ||
1167 | r.super_visit_with(self) | |
1168 | } | |
1169 | } |