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