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Commit | Line | Data |
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f9f354fc XL |
1 | //! Provides the `RustIrDatabase` implementation for `chalk-solve` |
2 | //! | |
3 | //! The purpose of the `chalk_solve::RustIrDatabase` is to get data about | |
4 | //! specific types, such as bounds, where clauses, or fields. This file contains | |
5 | //! the minimal logic to assemble the types for `chalk-solve` by calling out to | |
6 | //! either the `TyCtxt` (for information about types) or | |
7 | //! `crate::chalk::lowering` (to lower rustc types into Chalk types). | |
8 | ||
f035d41b | 9 | use rustc_middle::traits::ChalkRustInterner as RustInterner; |
064997fb | 10 | use rustc_middle::ty::{self, AssocKind, EarlyBinder, Ty, TyCtxt, TypeFoldable, TypeSuperFoldable}; |
2b03887a | 11 | use rustc_middle::ty::{InternalSubsts, SubstsRef}; |
487cf647 | 12 | use rustc_target::abi::{Integer, IntegerType}; |
f9f354fc | 13 | |
5869c6ff | 14 | use rustc_ast::ast; |
5869c6ff | 15 | |
f9f354fc XL |
16 | use rustc_hir::def_id::DefId; |
17 | ||
18 | use rustc_span::symbol::sym; | |
19 | ||
20 | use std::fmt; | |
21 | use std::sync::Arc; | |
22 | ||
5099ac24 | 23 | use crate::chalk::lowering::LowerInto; |
f9f354fc XL |
24 | |
25 | pub struct RustIrDatabase<'tcx> { | |
1b1a35ee | 26 | pub(crate) interner: RustInterner<'tcx>, |
f9f354fc XL |
27 | } |
28 | ||
29 | impl fmt::Debug for RustIrDatabase<'_> { | |
30 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | |
31 | write!(f, "RustIrDatabase") | |
32 | } | |
33 | } | |
34 | ||
1b1a35ee XL |
35 | impl<'tcx> RustIrDatabase<'tcx> { |
36 | fn where_clauses_for( | |
37 | &self, | |
38 | def_id: DefId, | |
39 | bound_vars: SubstsRef<'tcx>, | |
40 | ) -> Vec<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>> { | |
29967ef6 | 41 | let predicates = self.interner.tcx.predicates_defined_on(def_id).predicates; |
1b1a35ee XL |
42 | predicates |
43 | .iter() | |
04454e1e | 44 | .map(|(wc, _)| EarlyBinder(*wc).subst(self.interner.tcx, bound_vars)) |
a2a8927a XL |
45 | .filter_map(|wc| LowerInto::< |
46 | Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>> | |
47 | >::lower_into(wc, self.interner)).collect() | |
1b1a35ee | 48 | } |
29967ef6 XL |
49 | |
50 | fn bounds_for<T>(&self, def_id: DefId, bound_vars: SubstsRef<'tcx>) -> Vec<T> | |
51 | where | |
52 | ty::Predicate<'tcx>: LowerInto<'tcx, std::option::Option<T>>, | |
53 | { | |
064997fb FG |
54 | let bounds = self.interner.tcx.bound_explicit_item_bounds(def_id); |
55 | bounds | |
56 | .0 | |
29967ef6 | 57 | .iter() |
064997fb | 58 | .map(|(bound, _)| bounds.rebind(*bound).subst(self.interner.tcx, &bound_vars)) |
a2a8927a | 59 | .filter_map(|bound| LowerInto::<Option<_>>::lower_into(bound, self.interner)) |
29967ef6 XL |
60 | .collect() |
61 | } | |
1b1a35ee XL |
62 | } |
63 | ||
f9f354fc | 64 | impl<'tcx> chalk_solve::RustIrDatabase<RustInterner<'tcx>> for RustIrDatabase<'tcx> { |
a2a8927a XL |
65 | fn interner(&self) -> RustInterner<'tcx> { |
66 | self.interner | |
f9f354fc XL |
67 | } |
68 | ||
69 | fn associated_ty_data( | |
70 | &self, | |
71 | assoc_type_id: chalk_ir::AssocTypeId<RustInterner<'tcx>>, | |
f035d41b XL |
72 | ) -> Arc<chalk_solve::rust_ir::AssociatedTyDatum<RustInterner<'tcx>>> { |
73 | let def_id = assoc_type_id.0; | |
1b1a35ee | 74 | let assoc_item = self.interner.tcx.associated_item(def_id); |
064997fb | 75 | let Some(trait_def_id) = assoc_item.trait_container(self.interner.tcx) else { |
5e7ed085 | 76 | unimplemented!("Not possible??"); |
f9f354fc XL |
77 | }; |
78 | match assoc_item.kind { | |
79 | AssocKind::Type => {} | |
80 | _ => unimplemented!("Not possible??"), | |
81 | } | |
1b1a35ee | 82 | let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
a2a8927a | 83 | let binders = binders_for(self.interner, bound_vars); |
29967ef6 | 84 | |
1b1a35ee | 85 | let where_clauses = self.where_clauses_for(def_id, bound_vars); |
29967ef6 | 86 | let bounds = self.bounds_for(def_id, bound_vars); |
f9f354fc | 87 | |
f035d41b XL |
88 | Arc::new(chalk_solve::rust_ir::AssociatedTyDatum { |
89 | trait_id: chalk_ir::TraitId(trait_def_id), | |
f9f354fc XL |
90 | id: assoc_type_id, |
91 | name: (), | |
92 | binders: chalk_ir::Binders::new( | |
93 | binders, | |
29967ef6 | 94 | chalk_solve::rust_ir::AssociatedTyDatumBound { bounds, where_clauses }, |
f9f354fc XL |
95 | ), |
96 | }) | |
97 | } | |
98 | ||
99 | fn trait_datum( | |
100 | &self, | |
101 | trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, | |
f035d41b | 102 | ) -> Arc<chalk_solve::rust_ir::TraitDatum<RustInterner<'tcx>>> { |
5e7ed085 FG |
103 | use chalk_solve::rust_ir::WellKnownTrait::*; |
104 | ||
f035d41b | 105 | let def_id = trait_id.0; |
1b1a35ee | 106 | let trait_def = self.interner.tcx.trait_def(def_id); |
f9f354fc | 107 | |
1b1a35ee | 108 | let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
a2a8927a | 109 | let binders = binders_for(self.interner, bound_vars); |
1b1a35ee XL |
110 | |
111 | let where_clauses = self.where_clauses_for(def_id, bound_vars); | |
112 | ||
f035d41b | 113 | let associated_ty_ids: Vec<_> = self |
1b1a35ee | 114 | .interner |
f035d41b XL |
115 | .tcx |
116 | .associated_items(def_id) | |
117 | .in_definition_order() | |
118 | .filter(|i| i.kind == AssocKind::Type) | |
119 | .map(|i| chalk_ir::AssocTypeId(i.def_id)) | |
120 | .collect(); | |
f9f354fc | 121 | |
29967ef6 XL |
122 | let lang_items = self.interner.tcx.lang_items(); |
123 | let well_known = if lang_items.sized_trait() == Some(def_id) { | |
5e7ed085 | 124 | Some(Sized) |
29967ef6 | 125 | } else if lang_items.copy_trait() == Some(def_id) { |
5e7ed085 | 126 | Some(Copy) |
29967ef6 | 127 | } else if lang_items.clone_trait() == Some(def_id) { |
5e7ed085 | 128 | Some(Clone) |
29967ef6 | 129 | } else if lang_items.drop_trait() == Some(def_id) { |
5e7ed085 | 130 | Some(Drop) |
29967ef6 | 131 | } else if lang_items.fn_trait() == Some(def_id) { |
5e7ed085 | 132 | Some(Fn) |
29967ef6 | 133 | } else if lang_items.fn_once_trait() == Some(def_id) { |
5e7ed085 | 134 | Some(FnOnce) |
29967ef6 | 135 | } else if lang_items.fn_mut_trait() == Some(def_id) { |
5e7ed085 | 136 | Some(FnMut) |
29967ef6 | 137 | } else if lang_items.unsize_trait() == Some(def_id) { |
5e7ed085 | 138 | Some(Unsize) |
29967ef6 | 139 | } else if lang_items.unpin_trait() == Some(def_id) { |
5e7ed085 | 140 | Some(Unpin) |
29967ef6 | 141 | } else if lang_items.coerce_unsized_trait() == Some(def_id) { |
5e7ed085 FG |
142 | Some(CoerceUnsized) |
143 | } else if lang_items.dispatch_from_dyn_trait() == Some(def_id) { | |
144 | Some(DispatchFromDyn) | |
487cf647 FG |
145 | } else if lang_items.tuple_trait() == Some(def_id) { |
146 | Some(Tuple) | |
1b1a35ee XL |
147 | } else { |
148 | None | |
149 | }; | |
f035d41b | 150 | Arc::new(chalk_solve::rust_ir::TraitDatum { |
f9f354fc XL |
151 | id: trait_id, |
152 | binders: chalk_ir::Binders::new( | |
153 | binders, | |
f035d41b | 154 | chalk_solve::rust_ir::TraitDatumBound { where_clauses }, |
f9f354fc | 155 | ), |
f035d41b | 156 | flags: chalk_solve::rust_ir::TraitFlags { |
f9f354fc XL |
157 | auto: trait_def.has_auto_impl, |
158 | marker: trait_def.is_marker, | |
159 | upstream: !def_id.is_local(), | |
1b1a35ee | 160 | fundamental: self.interner.tcx.has_attr(def_id, sym::fundamental), |
f9f354fc XL |
161 | non_enumerable: true, |
162 | coinductive: false, | |
163 | }, | |
f035d41b | 164 | associated_ty_ids, |
f9f354fc XL |
165 | well_known, |
166 | }) | |
167 | } | |
168 | ||
f035d41b | 169 | fn adt_datum( |
f9f354fc | 170 | &self, |
f035d41b XL |
171 | adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, |
172 | ) -> Arc<chalk_solve::rust_ir::AdtDatum<RustInterner<'tcx>>> { | |
173 | let adt_def = adt_id.0; | |
f9f354fc | 174 | |
5e7ed085 | 175 | let bound_vars = bound_vars_for_item(self.interner.tcx, adt_def.did()); |
a2a8927a | 176 | let binders = binders_for(self.interner, bound_vars); |
f9f354fc | 177 | |
5e7ed085 | 178 | let where_clauses = self.where_clauses_for(adt_def.did(), bound_vars); |
1b1a35ee XL |
179 | |
180 | let variants: Vec<_> = adt_def | |
5e7ed085 | 181 | .variants() |
3dfed10e | 182 | .iter() |
1b1a35ee XL |
183 | .map(|variant| chalk_solve::rust_ir::AdtVariantDatum { |
184 | fields: variant | |
f035d41b | 185 | .fields |
f9f354fc | 186 | .iter() |
a2a8927a | 187 | .map(|field| field.ty(self.interner.tcx, bound_vars).lower_into(self.interner)) |
1b1a35ee XL |
188 | .collect(), |
189 | }) | |
190 | .collect(); | |
191 | Arc::new(chalk_solve::rust_ir::AdtDatum { | |
f035d41b XL |
192 | id: adt_id, |
193 | binders: chalk_ir::Binders::new( | |
194 | binders, | |
1b1a35ee | 195 | chalk_solve::rust_ir::AdtDatumBound { variants, where_clauses }, |
f035d41b XL |
196 | ), |
197 | flags: chalk_solve::rust_ir::AdtFlags { | |
5e7ed085 | 198 | upstream: !adt_def.did().is_local(), |
f035d41b XL |
199 | fundamental: adt_def.is_fundamental(), |
200 | phantom_data: adt_def.is_phantom_data(), | |
201 | }, | |
1b1a35ee XL |
202 | kind: match adt_def.adt_kind() { |
203 | ty::AdtKind::Struct => chalk_solve::rust_ir::AdtKind::Struct, | |
204 | ty::AdtKind::Union => chalk_solve::rust_ir::AdtKind::Union, | |
205 | ty::AdtKind::Enum => chalk_solve::rust_ir::AdtKind::Enum, | |
206 | }, | |
207 | }) | |
208 | } | |
209 | ||
210 | fn adt_repr( | |
211 | &self, | |
212 | adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, | |
5869c6ff | 213 | ) -> Arc<chalk_solve::rust_ir::AdtRepr<RustInterner<'tcx>>> { |
1b1a35ee | 214 | let adt_def = adt_id.0; |
a2a8927a XL |
215 | let int = |i| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Int(i)).intern(self.interner); |
216 | let uint = |i| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Uint(i)).intern(self.interner); | |
5869c6ff | 217 | Arc::new(chalk_solve::rust_ir::AdtRepr { |
5e7ed085 FG |
218 | c: adt_def.repr().c(), |
219 | packed: adt_def.repr().packed(), | |
220 | int: adt_def.repr().int.map(|i| match i { | |
487cf647 FG |
221 | IntegerType::Pointer(true) => int(chalk_ir::IntTy::Isize), |
222 | IntegerType::Pointer(false) => uint(chalk_ir::UintTy::Usize), | |
223 | IntegerType::Fixed(i, true) => match i { | |
224 | Integer::I8 => int(chalk_ir::IntTy::I8), | |
225 | Integer::I16 => int(chalk_ir::IntTy::I16), | |
226 | Integer::I32 => int(chalk_ir::IntTy::I32), | |
227 | Integer::I64 => int(chalk_ir::IntTy::I64), | |
228 | Integer::I128 => int(chalk_ir::IntTy::I128), | |
5869c6ff | 229 | }, |
487cf647 FG |
230 | IntegerType::Fixed(i, false) => match i { |
231 | Integer::I8 => uint(chalk_ir::UintTy::U8), | |
232 | Integer::I16 => uint(chalk_ir::UintTy::U16), | |
233 | Integer::I32 => uint(chalk_ir::UintTy::U32), | |
234 | Integer::I64 => uint(chalk_ir::UintTy::U64), | |
235 | Integer::I128 => uint(chalk_ir::UintTy::U128), | |
5869c6ff XL |
236 | }, |
237 | }), | |
238 | }) | |
f035d41b | 239 | } |
f9f354fc | 240 | |
5e7ed085 FG |
241 | fn adt_size_align( |
242 | &self, | |
243 | adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, | |
244 | ) -> Arc<chalk_solve::rust_ir::AdtSizeAlign> { | |
245 | let tcx = self.interner.tcx; | |
246 | let did = adt_id.0.did(); | |
247 | ||
248 | // Grab the ADT and the param we might need to calculate its layout | |
249 | let param_env = tcx.param_env(did); | |
250 | let adt_ty = tcx.type_of(did); | |
251 | ||
252 | // The ADT is a 1-zst if it's a ZST and its alignment is 1. | |
253 | // Mark the ADT as _not_ a 1-zst if there was a layout error. | |
254 | let one_zst = if let Ok(layout) = tcx.layout_of(param_env.and(adt_ty)) { | |
255 | layout.is_zst() && layout.align.abi.bytes() == 1 | |
256 | } else { | |
257 | false | |
258 | }; | |
259 | ||
260 | Arc::new(chalk_solve::rust_ir::AdtSizeAlign::from_one_zst(one_zst)) | |
261 | } | |
262 | ||
f035d41b XL |
263 | fn fn_def_datum( |
264 | &self, | |
265 | fn_def_id: chalk_ir::FnDefId<RustInterner<'tcx>>, | |
266 | ) -> Arc<chalk_solve::rust_ir::FnDefDatum<RustInterner<'tcx>>> { | |
267 | let def_id = fn_def_id.0; | |
1b1a35ee | 268 | let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
a2a8927a | 269 | let binders = binders_for(self.interner, bound_vars); |
f035d41b | 270 | |
1b1a35ee | 271 | let where_clauses = self.where_clauses_for(def_id, bound_vars); |
f035d41b | 272 | |
064997fb | 273 | let sig = self.interner.tcx.bound_fn_sig(def_id); |
f035d41b | 274 | let (inputs_and_output, iobinders, _) = crate::chalk::lowering::collect_bound_vars( |
a2a8927a | 275 | self.interner, |
1b1a35ee | 276 | self.interner.tcx, |
064997fb | 277 | sig.map_bound(|s| s.inputs_and_output()).subst(self.interner.tcx, bound_vars), |
f035d41b XL |
278 | ); |
279 | ||
280 | let argument_types = inputs_and_output[..inputs_and_output.len() - 1] | |
281 | .iter() | |
064997fb | 282 | .map(|t| sig.rebind(*t).subst(self.interner.tcx, &bound_vars).lower_into(self.interner)) |
f035d41b XL |
283 | .collect(); |
284 | ||
064997fb FG |
285 | let return_type = sig |
286 | .rebind(inputs_and_output[inputs_and_output.len() - 1]) | |
1b1a35ee | 287 | .subst(self.interner.tcx, &bound_vars) |
a2a8927a | 288 | .lower_into(self.interner); |
f035d41b XL |
289 | |
290 | let bound = chalk_solve::rust_ir::FnDefDatumBound { | |
291 | inputs_and_output: chalk_ir::Binders::new( | |
292 | iobinders, | |
293 | chalk_solve::rust_ir::FnDefInputsAndOutputDatum { argument_types, return_type }, | |
294 | ), | |
295 | where_clauses, | |
296 | }; | |
297 | Arc::new(chalk_solve::rust_ir::FnDefDatum { | |
298 | id: fn_def_id, | |
064997fb | 299 | sig: sig.0.lower_into(self.interner), |
f035d41b XL |
300 | binders: chalk_ir::Binders::new(binders, bound), |
301 | }) | |
f9f354fc XL |
302 | } |
303 | ||
304 | fn impl_datum( | |
305 | &self, | |
306 | impl_id: chalk_ir::ImplId<RustInterner<'tcx>>, | |
f035d41b XL |
307 | ) -> Arc<chalk_solve::rust_ir::ImplDatum<RustInterner<'tcx>>> { |
308 | let def_id = impl_id.0; | |
1b1a35ee | 309 | let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
a2a8927a | 310 | let binders = binders_for(self.interner, bound_vars); |
f9f354fc | 311 | |
04454e1e | 312 | let trait_ref = self.interner.tcx.bound_impl_trait_ref(def_id).expect("not an impl"); |
1b1a35ee | 313 | let trait_ref = trait_ref.subst(self.interner.tcx, bound_vars); |
f9f354fc | 314 | |
1b1a35ee | 315 | let where_clauses = self.where_clauses_for(def_id, bound_vars); |
f9f354fc | 316 | |
f035d41b | 317 | let value = chalk_solve::rust_ir::ImplDatumBound { |
a2a8927a | 318 | trait_ref: trait_ref.lower_into(self.interner), |
f9f354fc XL |
319 | where_clauses, |
320 | }; | |
321 | ||
29967ef6 XL |
322 | let associated_ty_value_ids: Vec<_> = self |
323 | .interner | |
324 | .tcx | |
325 | .associated_items(def_id) | |
326 | .in_definition_order() | |
327 | .filter(|i| i.kind == AssocKind::Type) | |
328 | .map(|i| chalk_solve::rust_ir::AssociatedTyValueId(i.def_id)) | |
329 | .collect(); | |
330 | ||
f035d41b | 331 | Arc::new(chalk_solve::rust_ir::ImplDatum { |
a2a8927a | 332 | polarity: self.interner.tcx.impl_polarity(def_id).lower_into(self.interner), |
f9f354fc | 333 | binders: chalk_ir::Binders::new(binders, value), |
f035d41b | 334 | impl_type: chalk_solve::rust_ir::ImplType::Local, |
29967ef6 | 335 | associated_ty_value_ids, |
f9f354fc XL |
336 | }) |
337 | } | |
338 | ||
339 | fn impls_for_trait( | |
340 | &self, | |
341 | trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, | |
f035d41b | 342 | parameters: &[chalk_ir::GenericArg<RustInterner<'tcx>>], |
1b1a35ee | 343 | _binders: &chalk_ir::CanonicalVarKinds<RustInterner<'tcx>>, |
f9f354fc | 344 | ) -> Vec<chalk_ir::ImplId<RustInterner<'tcx>>> { |
f035d41b | 345 | let def_id = trait_id.0; |
f9f354fc XL |
346 | |
347 | // FIXME(chalk): use TraitDef::for_each_relevant_impl, but that will | |
348 | // require us to be able to interconvert `Ty<'tcx>`, and we're | |
349 | // not there yet. | |
350 | ||
1b1a35ee | 351 | let all_impls = self.interner.tcx.all_impls(def_id); |
f9f354fc XL |
352 | let matched_impls = all_impls.filter(|impl_def_id| { |
353 | use chalk_ir::could_match::CouldMatch; | |
04454e1e | 354 | let trait_ref = self.interner.tcx.bound_impl_trait_ref(*impl_def_id).unwrap(); |
1b1a35ee | 355 | let bound_vars = bound_vars_for_item(self.interner.tcx, *impl_def_id); |
f9f354fc | 356 | |
04454e1e | 357 | let self_ty = trait_ref.map_bound(|t| t.self_ty()); |
1b1a35ee | 358 | let self_ty = self_ty.subst(self.interner.tcx, bound_vars); |
a2a8927a | 359 | let lowered_ty = self_ty.lower_into(self.interner); |
f9f354fc | 360 | |
a2a8927a XL |
361 | parameters[0].assert_ty_ref(self.interner).could_match( |
362 | self.interner, | |
5869c6ff XL |
363 | self.unification_database(), |
364 | &lowered_ty, | |
365 | ) | |
f9f354fc XL |
366 | }); |
367 | ||
3dfed10e | 368 | let impls = matched_impls.map(chalk_ir::ImplId).collect(); |
f9f354fc XL |
369 | impls |
370 | } | |
371 | ||
372 | fn impl_provided_for( | |
373 | &self, | |
374 | auto_trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, | |
29967ef6 | 375 | chalk_ty: &chalk_ir::TyKind<RustInterner<'tcx>>, |
f9f354fc | 376 | ) -> bool { |
1b1a35ee | 377 | use chalk_ir::Scalar::*; |
29967ef6 | 378 | use chalk_ir::TyKind::*; |
1b1a35ee | 379 | |
f035d41b | 380 | let trait_def_id = auto_trait_id.0; |
1b1a35ee | 381 | let all_impls = self.interner.tcx.all_impls(trait_def_id); |
f9f354fc | 382 | for impl_def_id in all_impls { |
1b1a35ee | 383 | let trait_ref = self.interner.tcx.impl_trait_ref(impl_def_id).unwrap(); |
f9f354fc | 384 | let self_ty = trait_ref.self_ty(); |
29967ef6 | 385 | let provides = match (self_ty.kind(), chalk_ty) { |
5e7ed085 | 386 | (&ty::Adt(impl_adt_def, ..), Adt(id, ..)) => impl_adt_def.did() == id.0.did(), |
29967ef6 | 387 | (_, AssociatedType(_ty_id, ..)) => { |
1b1a35ee XL |
388 | // FIXME(chalk): See https://github.com/rust-lang/rust/pull/77152#discussion_r494484774 |
389 | false | |
390 | } | |
391 | (ty::Bool, Scalar(Bool)) => true, | |
392 | (ty::Char, Scalar(Char)) => true, | |
29967ef6 XL |
393 | (ty::Int(ty1), Scalar(Int(ty2))) => matches!( |
394 | (ty1, ty2), | |
5869c6ff XL |
395 | (ty::IntTy::Isize, chalk_ir::IntTy::Isize) |
396 | | (ty::IntTy::I8, chalk_ir::IntTy::I8) | |
397 | | (ty::IntTy::I16, chalk_ir::IntTy::I16) | |
398 | | (ty::IntTy::I32, chalk_ir::IntTy::I32) | |
399 | | (ty::IntTy::I64, chalk_ir::IntTy::I64) | |
400 | | (ty::IntTy::I128, chalk_ir::IntTy::I128) | |
29967ef6 XL |
401 | ), |
402 | (ty::Uint(ty1), Scalar(Uint(ty2))) => matches!( | |
403 | (ty1, ty2), | |
5869c6ff XL |
404 | (ty::UintTy::Usize, chalk_ir::UintTy::Usize) |
405 | | (ty::UintTy::U8, chalk_ir::UintTy::U8) | |
406 | | (ty::UintTy::U16, chalk_ir::UintTy::U16) | |
407 | | (ty::UintTy::U32, chalk_ir::UintTy::U32) | |
408 | | (ty::UintTy::U64, chalk_ir::UintTy::U64) | |
409 | | (ty::UintTy::U128, chalk_ir::UintTy::U128) | |
29967ef6 XL |
410 | ), |
411 | (ty::Float(ty1), Scalar(Float(ty2))) => matches!( | |
412 | (ty1, ty2), | |
5869c6ff XL |
413 | (ty::FloatTy::F32, chalk_ir::FloatTy::F32) |
414 | | (ty::FloatTy::F64, chalk_ir::FloatTy::F64) | |
29967ef6 XL |
415 | ), |
416 | (&ty::Tuple(substs), Tuple(len, _)) => substs.len() == *len, | |
417 | (&ty::Array(..), Array(..)) => true, | |
418 | (&ty::Slice(..), Slice(..)) => true, | |
419 | (&ty::RawPtr(type_and_mut), Raw(mutability, _)) => { | |
1b1a35ee XL |
420 | match (type_and_mut.mutbl, mutability) { |
421 | (ast::Mutability::Mut, chalk_ir::Mutability::Mut) => true, | |
422 | (ast::Mutability::Mut, chalk_ir::Mutability::Not) => false, | |
423 | (ast::Mutability::Not, chalk_ir::Mutability::Mut) => false, | |
424 | (ast::Mutability::Not, chalk_ir::Mutability::Not) => true, | |
f9f354fc XL |
425 | } |
426 | } | |
29967ef6 XL |
427 | (&ty::Ref(.., mutability1), Ref(mutability2, ..)) => { |
428 | match (mutability1, mutability2) { | |
429 | (ast::Mutability::Mut, chalk_ir::Mutability::Mut) => true, | |
430 | (ast::Mutability::Mut, chalk_ir::Mutability::Not) => false, | |
431 | (ast::Mutability::Not, chalk_ir::Mutability::Mut) => false, | |
432 | (ast::Mutability::Not, chalk_ir::Mutability::Not) => true, | |
433 | } | |
434 | } | |
435 | (&ty::Opaque(def_id, ..), OpaqueType(opaque_ty_id, ..)) => def_id == opaque_ty_id.0, | |
436 | (&ty::FnDef(def_id, ..), FnDef(fn_def_id, ..)) => def_id == fn_def_id.0, | |
1b1a35ee XL |
437 | (&ty::Str, Str) => true, |
438 | (&ty::Never, Never) => true, | |
29967ef6 | 439 | (&ty::Closure(def_id, ..), Closure(closure_id, _)) => def_id == closure_id.0, |
1b1a35ee XL |
440 | (&ty::Foreign(def_id), Foreign(foreign_def_id)) => def_id == foreign_def_id.0, |
441 | (&ty::Error(..), Error) => false, | |
442 | _ => false, | |
443 | }; | |
444 | if provides { | |
445 | return true; | |
f9f354fc XL |
446 | } |
447 | } | |
448 | false | |
449 | } | |
450 | ||
451 | fn associated_ty_value( | |
452 | &self, | |
f035d41b XL |
453 | associated_ty_id: chalk_solve::rust_ir::AssociatedTyValueId<RustInterner<'tcx>>, |
454 | ) -> Arc<chalk_solve::rust_ir::AssociatedTyValue<RustInterner<'tcx>>> { | |
455 | let def_id = associated_ty_id.0; | |
1b1a35ee | 456 | let assoc_item = self.interner.tcx.associated_item(def_id); |
064997fb | 457 | let impl_id = assoc_item.container_id(self.interner.tcx); |
f9f354fc XL |
458 | match assoc_item.kind { |
459 | AssocKind::Type => {} | |
460 | _ => unimplemented!("Not possible??"), | |
461 | } | |
29967ef6 | 462 | |
5099ac24 | 463 | let trait_item_id = assoc_item.trait_item_def_id.expect("assoc_ty with no trait version"); |
1b1a35ee | 464 | let bound_vars = bound_vars_for_item(self.interner.tcx, def_id); |
a2a8927a | 465 | let binders = binders_for(self.interner, bound_vars); |
29967ef6 XL |
466 | let ty = self |
467 | .interner | |
468 | .tcx | |
04454e1e | 469 | .bound_type_of(def_id) |
29967ef6 | 470 | .subst(self.interner.tcx, bound_vars) |
a2a8927a | 471 | .lower_into(self.interner); |
f9f354fc | 472 | |
f035d41b XL |
473 | Arc::new(chalk_solve::rust_ir::AssociatedTyValue { |
474 | impl_id: chalk_ir::ImplId(impl_id), | |
5099ac24 | 475 | associated_ty_id: chalk_ir::AssocTypeId(trait_item_id), |
f9f354fc XL |
476 | value: chalk_ir::Binders::new( |
477 | binders, | |
29967ef6 | 478 | chalk_solve::rust_ir::AssociatedTyValueBound { ty }, |
f9f354fc XL |
479 | ), |
480 | }) | |
481 | } | |
482 | ||
483 | fn custom_clauses(&self) -> Vec<chalk_ir::ProgramClause<RustInterner<'tcx>>> { | |
484 | vec![] | |
485 | } | |
486 | ||
487 | fn local_impls_to_coherence_check( | |
488 | &self, | |
489 | _trait_id: chalk_ir::TraitId<RustInterner<'tcx>>, | |
490 | ) -> Vec<chalk_ir::ImplId<RustInterner<'tcx>>> { | |
491 | unimplemented!() | |
492 | } | |
493 | ||
494 | fn opaque_ty_data( | |
495 | &self, | |
f035d41b XL |
496 | opaque_ty_id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>, |
497 | ) -> Arc<chalk_solve::rust_ir::OpaqueTyDatum<RustInterner<'tcx>>> { | |
29967ef6 XL |
498 | let bound_vars = ty::fold::shift_vars( |
499 | self.interner.tcx, | |
fc512014 | 500 | bound_vars_for_item(self.interner.tcx, opaque_ty_id.0), |
29967ef6 XL |
501 | 1, |
502 | ); | |
1b1a35ee | 503 | let where_clauses = self.where_clauses_for(opaque_ty_id.0, bound_vars); |
f035d41b | 504 | |
29967ef6 XL |
505 | let identity_substs = InternalSubsts::identity_for_item(self.interner.tcx, opaque_ty_id.0); |
506 | ||
064997fb | 507 | let explicit_item_bounds = self.interner.tcx.bound_explicit_item_bounds(opaque_ty_id.0); |
29967ef6 | 508 | let bounds = |
064997fb FG |
509 | explicit_item_bounds |
510 | .0 | |
29967ef6 | 511 | .iter() |
064997fb FG |
512 | .map(|(bound, _)| { |
513 | explicit_item_bounds.rebind(*bound).subst(self.interner.tcx, &bound_vars) | |
514 | }) | |
29967ef6 | 515 | .map(|bound| { |
5e7ed085 | 516 | bound.fold_with(&mut ReplaceOpaqueTyFolder { |
29967ef6 | 517 | tcx: self.interner.tcx, |
5e7ed085 FG |
518 | opaque_ty_id, |
519 | identity_substs, | |
520 | binder_index: ty::INNERMOST, | |
29967ef6 XL |
521 | }) |
522 | }) | |
523 | .filter_map(|bound| { | |
524 | LowerInto::< | |
525 | Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>> | |
a2a8927a | 526 | >::lower_into(bound, self.interner) |
29967ef6 XL |
527 | }) |
528 | .collect(); | |
529 | ||
530 | // Binder for the bound variable representing the concrete impl Trait type. | |
531 | let existential_binder = chalk_ir::VariableKinds::from1( | |
a2a8927a | 532 | self.interner, |
29967ef6 XL |
533 | chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General), |
534 | ); | |
535 | ||
f035d41b | 536 | let value = chalk_solve::rust_ir::OpaqueTyDatumBound { |
29967ef6 XL |
537 | bounds: chalk_ir::Binders::new(existential_binder.clone(), bounds), |
538 | where_clauses: chalk_ir::Binders::new(existential_binder, where_clauses), | |
f035d41b | 539 | }; |
29967ef6 | 540 | |
a2a8927a | 541 | let binders = binders_for(self.interner, bound_vars); |
f035d41b XL |
542 | Arc::new(chalk_solve::rust_ir::OpaqueTyDatum { |
543 | opaque_ty_id, | |
29967ef6 | 544 | bound: chalk_ir::Binders::new(binders, value), |
f035d41b | 545 | }) |
f9f354fc XL |
546 | } |
547 | ||
f9f354fc XL |
548 | fn program_clauses_for_env( |
549 | &self, | |
550 | environment: &chalk_ir::Environment<RustInterner<'tcx>>, | |
551 | ) -> chalk_ir::ProgramClauses<RustInterner<'tcx>> { | |
552 | chalk_solve::program_clauses_for_env(self, environment) | |
553 | } | |
554 | ||
555 | fn well_known_trait_id( | |
556 | &self, | |
f035d41b | 557 | well_known_trait: chalk_solve::rust_ir::WellKnownTrait, |
f9f354fc | 558 | ) -> Option<chalk_ir::TraitId<RustInterner<'tcx>>> { |
f035d41b | 559 | use chalk_solve::rust_ir::WellKnownTrait::*; |
1b1a35ee | 560 | let lang_items = self.interner.tcx.lang_items(); |
f035d41b | 561 | let def_id = match well_known_trait { |
1b1a35ee XL |
562 | Sized => lang_items.sized_trait(), |
563 | Copy => lang_items.copy_trait(), | |
564 | Clone => lang_items.clone_trait(), | |
565 | Drop => lang_items.drop_trait(), | |
566 | Fn => lang_items.fn_trait(), | |
567 | FnMut => lang_items.fn_mut_trait(), | |
568 | FnOnce => lang_items.fn_once_trait(), | |
5099ac24 | 569 | Generator => lang_items.gen_trait(), |
1b1a35ee XL |
570 | Unsize => lang_items.unsize_trait(), |
571 | Unpin => lang_items.unpin_trait(), | |
572 | CoerceUnsized => lang_items.coerce_unsized_trait(), | |
5869c6ff | 573 | DiscriminantKind => lang_items.discriminant_kind_trait(), |
5e7ed085 | 574 | DispatchFromDyn => lang_items.dispatch_from_dyn_trait(), |
487cf647 | 575 | Tuple => lang_items.tuple_trait(), |
f9f354fc | 576 | }; |
3dfed10e | 577 | def_id.map(chalk_ir::TraitId) |
f035d41b XL |
578 | } |
579 | ||
580 | fn is_object_safe(&self, trait_id: chalk_ir::TraitId<RustInterner<'tcx>>) -> bool { | |
1b1a35ee | 581 | self.interner.tcx.is_object_safe(trait_id.0) |
f035d41b XL |
582 | } |
583 | ||
584 | fn hidden_opaque_type( | |
585 | &self, | |
586 | _id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>, | |
587 | ) -> chalk_ir::Ty<RustInterner<'tcx>> { | |
588 | // FIXME(chalk): actually get hidden ty | |
1b1a35ee XL |
589 | self.interner |
590 | .tcx | |
5e7ed085 | 591 | .mk_ty(ty::Tuple(self.interner.tcx.intern_type_list(&[]))) |
a2a8927a | 592 | .lower_into(self.interner) |
f035d41b XL |
593 | } |
594 | ||
595 | fn closure_kind( | |
596 | &self, | |
597 | _closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>, | |
598 | substs: &chalk_ir::Substitution<RustInterner<'tcx>>, | |
599 | ) -> chalk_solve::rust_ir::ClosureKind { | |
a2a8927a XL |
600 | let kind = &substs.as_slice(self.interner)[substs.len(self.interner) - 3]; |
601 | match kind.assert_ty_ref(self.interner).kind(self.interner) { | |
29967ef6 XL |
602 | chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Int(int_ty)) => match int_ty { |
603 | chalk_ir::IntTy::I8 => chalk_solve::rust_ir::ClosureKind::Fn, | |
604 | chalk_ir::IntTy::I16 => chalk_solve::rust_ir::ClosureKind::FnMut, | |
605 | chalk_ir::IntTy::I32 => chalk_solve::rust_ir::ClosureKind::FnOnce, | |
f035d41b XL |
606 | _ => bug!("bad closure kind"), |
607 | }, | |
608 | _ => bug!("bad closure kind"), | |
609 | } | |
610 | } | |
611 | ||
612 | fn closure_inputs_and_output( | |
613 | &self, | |
614 | _closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>, | |
615 | substs: &chalk_ir::Substitution<RustInterner<'tcx>>, | |
616 | ) -> chalk_ir::Binders<chalk_solve::rust_ir::FnDefInputsAndOutputDatum<RustInterner<'tcx>>> | |
617 | { | |
a2a8927a XL |
618 | let sig = &substs.as_slice(self.interner)[substs.len(self.interner) - 2]; |
619 | match sig.assert_ty_ref(self.interner).kind(self.interner) { | |
29967ef6 | 620 | chalk_ir::TyKind::Function(f) => { |
a2a8927a XL |
621 | let substitution = f.substitution.0.as_slice(self.interner); |
622 | let return_type = substitution.last().unwrap().assert_ty_ref(self.interner).clone(); | |
f035d41b | 623 | // Closure arguments are tupled |
a2a8927a XL |
624 | let argument_tuple = substitution[0].assert_ty_ref(self.interner); |
625 | let argument_types = match argument_tuple.kind(self.interner) { | |
29967ef6 | 626 | chalk_ir::TyKind::Tuple(_len, substitution) => substitution |
a2a8927a XL |
627 | .iter(self.interner) |
628 | .map(|arg| arg.assert_ty_ref(self.interner)) | |
29967ef6 XL |
629 | .cloned() |
630 | .collect(), | |
f035d41b XL |
631 | _ => bug!("Expecting closure FnSig args to be tupled."), |
632 | }; | |
633 | ||
634 | chalk_ir::Binders::new( | |
1b1a35ee | 635 | chalk_ir::VariableKinds::from_iter( |
a2a8927a | 636 | self.interner, |
f035d41b XL |
637 | (0..f.num_binders).map(|_| chalk_ir::VariableKind::Lifetime), |
638 | ), | |
639 | chalk_solve::rust_ir::FnDefInputsAndOutputDatum { argument_types, return_type }, | |
640 | ) | |
641 | } | |
642 | _ => panic!("Invalid sig."), | |
643 | } | |
644 | } | |
645 | ||
646 | fn closure_upvars( | |
647 | &self, | |
648 | _closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>, | |
649 | substs: &chalk_ir::Substitution<RustInterner<'tcx>>, | |
650 | ) -> chalk_ir::Binders<chalk_ir::Ty<RustInterner<'tcx>>> { | |
651 | let inputs_and_output = self.closure_inputs_and_output(_closure_id, substs); | |
a2a8927a | 652 | let tuple = substs.as_slice(self.interner).last().unwrap().assert_ty_ref(self.interner); |
f035d41b XL |
653 | inputs_and_output.map_ref(|_| tuple.clone()) |
654 | } | |
655 | ||
656 | fn closure_fn_substitution( | |
657 | &self, | |
658 | _closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>, | |
659 | substs: &chalk_ir::Substitution<RustInterner<'tcx>>, | |
660 | ) -> chalk_ir::Substitution<RustInterner<'tcx>> { | |
a2a8927a XL |
661 | let substitution = &substs.as_slice(self.interner)[0..substs.len(self.interner) - 3]; |
662 | chalk_ir::Substitution::from_iter(self.interner, substitution) | |
f9f354fc | 663 | } |
29967ef6 XL |
664 | |
665 | fn generator_datum( | |
666 | &self, | |
667 | _generator_id: chalk_ir::GeneratorId<RustInterner<'tcx>>, | |
668 | ) -> Arc<chalk_solve::rust_ir::GeneratorDatum<RustInterner<'tcx>>> { | |
669 | unimplemented!() | |
670 | } | |
671 | ||
672 | fn generator_witness_datum( | |
673 | &self, | |
674 | _generator_id: chalk_ir::GeneratorId<RustInterner<'tcx>>, | |
675 | ) -> Arc<chalk_solve::rust_ir::GeneratorWitnessDatum<RustInterner<'tcx>>> { | |
676 | unimplemented!() | |
677 | } | |
5869c6ff XL |
678 | |
679 | fn unification_database(&self) -> &dyn chalk_ir::UnificationDatabase<RustInterner<'tcx>> { | |
680 | self | |
681 | } | |
682 | ||
683 | fn discriminant_type( | |
684 | &self, | |
685 | _: chalk_ir::Ty<RustInterner<'tcx>>, | |
686 | ) -> chalk_ir::Ty<RustInterner<'tcx>> { | |
687 | unimplemented!() | |
688 | } | |
689 | } | |
690 | ||
691 | impl<'tcx> chalk_ir::UnificationDatabase<RustInterner<'tcx>> for RustIrDatabase<'tcx> { | |
692 | fn fn_def_variance( | |
693 | &self, | |
694 | def_id: chalk_ir::FnDefId<RustInterner<'tcx>>, | |
695 | ) -> chalk_ir::Variances<RustInterner<'tcx>> { | |
696 | let variances = self.interner.tcx.variances_of(def_id.0); | |
697 | chalk_ir::Variances::from_iter( | |
a2a8927a | 698 | self.interner, |
5099ac24 | 699 | variances.iter().map(|v| v.lower_into(self.interner)), |
5869c6ff XL |
700 | ) |
701 | } | |
702 | ||
703 | fn adt_variance( | |
704 | &self, | |
5099ac24 | 705 | adt_id: chalk_ir::AdtId<RustInterner<'tcx>>, |
5869c6ff | 706 | ) -> chalk_ir::Variances<RustInterner<'tcx>> { |
5e7ed085 | 707 | let variances = self.interner.tcx.variances_of(adt_id.0.did()); |
5869c6ff | 708 | chalk_ir::Variances::from_iter( |
a2a8927a | 709 | self.interner, |
5099ac24 | 710 | variances.iter().map(|v| v.lower_into(self.interner)), |
5869c6ff XL |
711 | ) |
712 | } | |
f9f354fc XL |
713 | } |
714 | ||
94222f64 | 715 | /// Creates an `InternalSubsts` that maps each generic parameter to a higher-ranked |
f9f354fc | 716 | /// var bound at index `0`. For types, we use a `BoundVar` index equal to |
fc512014 | 717 | /// the type parameter index. For regions, we use the `BoundRegionKind::BrNamed` |
f9f354fc | 718 | /// variant (which has a `DefId`). |
a2a8927a | 719 | fn bound_vars_for_item<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> SubstsRef<'tcx> { |
f9f354fc XL |
720 | InternalSubsts::for_item(tcx, def_id, |param, substs| match param.kind { |
721 | ty::GenericParamDefKind::Type { .. } => tcx | |
722 | .mk_ty(ty::Bound( | |
723 | ty::INNERMOST, | |
724 | ty::BoundTy { | |
725 | var: ty::BoundVar::from(param.index), | |
726 | kind: ty::BoundTyKind::Param(param.name), | |
727 | }, | |
728 | )) | |
729 | .into(), | |
730 | ||
fc512014 | 731 | ty::GenericParamDefKind::Lifetime => { |
cdc7bbd5 XL |
732 | let br = ty::BoundRegion { |
733 | var: ty::BoundVar::from_usize(substs.len()), | |
487cf647 | 734 | kind: ty::BrAnon(substs.len() as u32, None), |
cdc7bbd5 | 735 | }; |
5099ac24 | 736 | tcx.mk_region(ty::ReLateBound(ty::INNERMOST, br)).into() |
fc512014 | 737 | } |
f9f354fc | 738 | |
cdc7bbd5 | 739 | ty::GenericParamDefKind::Const { .. } => tcx |
487cf647 FG |
740 | .mk_const( |
741 | ty::ConstKind::Bound(ty::INNERMOST, ty::BoundVar::from(param.index)), | |
742 | tcx.type_of(param.def_id), | |
743 | ) | |
f9f354fc XL |
744 | .into(), |
745 | }) | |
746 | } | |
747 | ||
748 | fn binders_for<'tcx>( | |
a2a8927a | 749 | interner: RustInterner<'tcx>, |
f9f354fc | 750 | bound_vars: SubstsRef<'tcx>, |
f035d41b | 751 | ) -> chalk_ir::VariableKinds<RustInterner<'tcx>> { |
1b1a35ee | 752 | chalk_ir::VariableKinds::from_iter( |
f9f354fc XL |
753 | interner, |
754 | bound_vars.iter().map(|arg| match arg.unpack() { | |
f035d41b XL |
755 | ty::subst::GenericArgKind::Lifetime(_re) => chalk_ir::VariableKind::Lifetime, |
756 | ty::subst::GenericArgKind::Type(_ty) => { | |
29967ef6 | 757 | chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General) |
f035d41b XL |
758 | } |
759 | ty::subst::GenericArgKind::Const(c) => { | |
5099ac24 | 760 | chalk_ir::VariableKind::Const(c.ty().lower_into(interner)) |
f035d41b | 761 | } |
f9f354fc XL |
762 | }), |
763 | ) | |
764 | } | |
5e7ed085 FG |
765 | |
766 | struct ReplaceOpaqueTyFolder<'tcx> { | |
767 | tcx: TyCtxt<'tcx>, | |
768 | opaque_ty_id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>, | |
769 | identity_substs: SubstsRef<'tcx>, | |
770 | binder_index: ty::DebruijnIndex, | |
771 | } | |
772 | ||
773 | impl<'tcx> ty::TypeFolder<'tcx> for ReplaceOpaqueTyFolder<'tcx> { | |
774 | fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { | |
775 | self.tcx | |
776 | } | |
777 | ||
778 | fn fold_binder<T: TypeFoldable<'tcx>>( | |
779 | &mut self, | |
780 | t: ty::Binder<'tcx, T>, | |
781 | ) -> ty::Binder<'tcx, T> { | |
782 | self.binder_index.shift_in(1); | |
783 | let t = t.super_fold_with(self); | |
784 | self.binder_index.shift_out(1); | |
785 | t | |
786 | } | |
787 | ||
788 | fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> { | |
789 | if let ty::Opaque(def_id, substs) = *ty.kind() { | |
790 | if def_id == self.opaque_ty_id.0 && substs == self.identity_substs { | |
791 | return self.tcx.mk_ty(ty::Bound( | |
792 | self.binder_index, | |
793 | ty::BoundTy::from(ty::BoundVar::from_u32(0)), | |
794 | )); | |
795 | } | |
796 | } | |
797 | ty | |
798 | } | |
799 | } |