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-rw-r--r--crates/hir_ty/Cargo.toml6
-rw-r--r--crates/hir_ty/src/db.rs6
-rw-r--r--crates/hir_ty/src/tests/regression.rs43
-rw-r--r--crates/hir_ty/src/traits.rs13
-rw-r--r--crates/hir_ty/src/traits/chalk.rs49
-rw-r--r--crates/hir_ty/src/traits/chalk/interner.rs16
-rw-r--r--crates/hir_ty/src/traits/chalk/mapping.rs13
7 files changed, 129 insertions, 17 deletions
diff --git a/crates/hir_ty/Cargo.toml b/crates/hir_ty/Cargo.toml
index cf5c38a23..289e812fe 100644
--- a/crates/hir_ty/Cargo.toml
+++ b/crates/hir_ty/Cargo.toml
@@ -17,9 +17,9 @@ ena = "0.14.0"
17log = "0.4.8" 17log = "0.4.8"
18rustc-hash = "1.1.0" 18rustc-hash = "1.1.0"
19scoped-tls = "1" 19scoped-tls = "1"
20chalk-solve = { version = "0.37", default-features = false } 20chalk-solve = { version = "0.43", default-features = false }
21chalk-ir = "0.37" 21chalk-ir = "0.43"
22chalk-recursive = "0.37" 22chalk-recursive = "0.43"
23 23
24stdx = { path = "../stdx", version = "0.0.0" } 24stdx = { path = "../stdx", version = "0.0.0" }
25hir_def = { path = "../hir_def", version = "0.0.0" } 25hir_def = { path = "../hir_def", version = "0.0.0" }
diff --git a/crates/hir_ty/src/db.rs b/crates/hir_ty/src/db.rs
index 25cf9eb7f..66bdb8e88 100644
--- a/crates/hir_ty/src/db.rs
+++ b/crates/hir_ty/src/db.rs
@@ -99,6 +99,12 @@ pub trait HirDatabase: DefDatabase + Upcast<dyn DefDatabase> {
99 #[salsa::invoke(crate::traits::chalk::fn_def_datum_query)] 99 #[salsa::invoke(crate::traits::chalk::fn_def_datum_query)]
100 fn fn_def_datum(&self, krate: CrateId, fn_def_id: chalk::FnDefId) -> Arc<chalk::FnDefDatum>; 100 fn fn_def_datum(&self, krate: CrateId, fn_def_id: chalk::FnDefId) -> Arc<chalk::FnDefDatum>;
101 101
102 #[salsa::invoke(crate::traits::chalk::fn_def_variance_query)]
103 fn fn_def_variance(&self, krate: CrateId, fn_def_id: chalk::FnDefId) -> chalk::Variances;
104
105 #[salsa::invoke(crate::traits::chalk::adt_variance_query)]
106 fn adt_variance(&self, krate: CrateId, adt_id: chalk::AdtId) -> chalk::Variances;
107
102 #[salsa::invoke(crate::traits::chalk::associated_ty_value_query)] 108 #[salsa::invoke(crate::traits::chalk::associated_ty_value_query)]
103 fn associated_ty_value( 109 fn associated_ty_value(
104 &self, 110 &self,
diff --git a/crates/hir_ty/src/tests/regression.rs b/crates/hir_ty/src/tests/regression.rs
index 94d86b0d1..8cf4e7012 100644
--- a/crates/hir_ty/src/tests/regression.rs
+++ b/crates/hir_ty/src/tests/regression.rs
@@ -840,3 +840,46 @@ fn issue_4966() {
840 "#]], 840 "#]],
841 ); 841 );
842} 842}
843
844#[test]
845fn issue_6628() {
846 check_infer(
847 r#"
848 #[lang = "fn_once"]
849 pub trait FnOnce<Args> {
850 type Output;
851 }
852
853 struct S<T>();
854 impl<T> S<T> {
855 fn f(&self, _t: T) {}
856 fn g<F: FnOnce(&T)>(&self, _f: F) {}
857 }
858 fn main() {
859 let s = S();
860 s.g(|_x| {});
861 s.f(10);
862 }
863 "#,
864 expect![[r#"
865 105..109 'self': &S<T>
866 111..113 '_t': T
867 118..120 '{}': ()
868 146..150 'self': &S<T>
869 152..154 '_f': F
870 159..161 '{}': ()
871 174..225 '{ ...10); }': ()
872 184..185 's': S<i32>
873 188..189 'S': S<i32>() -> S<i32>
874 188..191 'S()': S<i32>
875 197..198 's': S<i32>
876 197..209 's.g(|_x| {})': ()
877 201..208 '|_x| {}': |&i32| -> ()
878 202..204 '_x': &i32
879 206..208 '{}': ()
880 215..216 's': S<i32>
881 215..222 's.f(10)': ()
882 219..221 '10': i32
883 "#]],
884 );
885}
diff --git a/crates/hir_ty/src/traits.rs b/crates/hir_ty/src/traits.rs
index ce1174cbe..dfa51896b 100644
--- a/crates/hir_ty/src/traits.rs
+++ b/crates/hir_ty/src/traits.rs
@@ -1,4 +1,5 @@
1//! Trait solving using Chalk. 1//! Trait solving using Chalk.
2use std::env::var;
2use std::sync::Arc; 3use std::sync::Arc;
3 4
4use base_db::CrateId; 5use base_db::CrateId;
@@ -15,12 +16,6 @@ use self::chalk::{from_chalk, Interner, ToChalk};
15 16
16pub(crate) mod chalk; 17pub(crate) mod chalk;
17 18
18// This controls the maximum size of types Chalk considers. If we set this too
19// high, we can run into slow edge cases; if we set it too low, Chalk won't
20// find some solutions.
21// FIXME this is currently hardcoded in the recursive solver
22// const CHALK_SOLVER_MAX_SIZE: usize = 10;
23
24/// This controls how much 'time' we give the Chalk solver before giving up. 19/// This controls how much 'time' we give the Chalk solver before giving up.
25const CHALK_SOLVER_FUEL: i32 = 100; 20const CHALK_SOLVER_FUEL: i32 = 100;
26 21
@@ -31,9 +26,11 @@ struct ChalkContext<'a> {
31} 26}
32 27
33fn create_chalk_solver() -> chalk_recursive::RecursiveSolver<Interner> { 28fn create_chalk_solver() -> chalk_recursive::RecursiveSolver<Interner> {
34 let overflow_depth = 100; 29 let overflow_depth =
30 var("CHALK_OVERFLOW_DEPTH").ok().and_then(|s| s.parse().ok()).unwrap_or(100);
35 let caching_enabled = true; 31 let caching_enabled = true;
36 chalk_recursive::RecursiveSolver::new(overflow_depth, caching_enabled) 32 let max_size = var("CHALK_SOLVER_MAX_SIZE").ok().and_then(|s| s.parse().ok()).unwrap_or(30);
33 chalk_recursive::RecursiveSolver::new(overflow_depth, max_size, caching_enabled)
37} 34}
38 35
39/// A set of clauses that we assume to be true. E.g. if we are inside this function: 36/// A set of clauses that we assume to be true. E.g. if we are inside this function:
diff --git a/crates/hir_ty/src/traits/chalk.rs b/crates/hir_ty/src/traits/chalk.rs
index 55e2c3a3e..69eae6f79 100644
--- a/crates/hir_ty/src/traits/chalk.rs
+++ b/crates/hir_ty/src/traits/chalk.rs
@@ -104,7 +104,7 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
104 }; 104 };
105 105
106 // Note: Since we're using impls_for_trait, only impls where the trait 106 // Note: Since we're using impls_for_trait, only impls where the trait
107 // can be resolved should ever reach Chalk. `impl_datum` relies on that 107 // can be resolved should ever reach Chalk. Symbol’s value as variable is void: impl_datum relies on that
108 // and will panic if the trait can't be resolved. 108 // and will panic if the trait can't be resolved.
109 let in_deps = self.db.trait_impls_in_deps(self.krate); 109 let in_deps = self.db.trait_impls_in_deps(self.krate);
110 let in_self = self.db.trait_impls_in_crate(self.krate); 110 let in_self = self.db.trait_impls_in_crate(self.krate);
@@ -206,7 +206,7 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
206 Some((trait_, alias)) 206 Some((trait_, alias))
207 }) 207 })
208 { 208 {
209 // Making up `AsyncBlock<T>: Future<Output = T>` 209 // Making up Symbol’s value as variable is void: AsyncBlock<T>:
210 // 210 //
211 // |--------------------OpaqueTyDatum-------------------| 211 // |--------------------OpaqueTyDatum-------------------|
212 // |-------------OpaqueTyDatumBound--------------| 212 // |-------------OpaqueTyDatumBound--------------|
@@ -242,7 +242,7 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
242 // The opaque type has 1 parameter. 242 // The opaque type has 1 parameter.
243 make_binders(bound, 1) 243 make_binders(bound, 1)
244 } else { 244 } else {
245 // If failed to find `Future::Output`, return empty bounds as fallback. 245 // If failed to find Symbol’s value as variable is void: Future::Output, return empty bounds as fallback.
246 let bound = OpaqueTyDatumBound { 246 let bound = OpaqueTyDatumBound {
247 bounds: make_binders(vec![], 0), 247 bounds: make_binders(vec![], 0),
248 where_clauses: make_binders(vec![], 0), 248 where_clauses: make_binders(vec![], 0),
@@ -343,6 +343,23 @@ impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
343 // FIXME 343 // FIXME
344 unimplemented!() 344 unimplemented!()
345 } 345 }
346
347 fn unification_database(&self) -> &dyn chalk_ir::UnificationDatabase<Interner> {
348 self
349 }
350}
351
352impl<'a> chalk_ir::UnificationDatabase<Interner> for ChalkContext<'a> {
353 fn fn_def_variance(
354 &self,
355 fn_def_id: chalk_ir::FnDefId<Interner>,
356 ) -> chalk_ir::Variances<Interner> {
357 self.db.fn_def_variance(self.krate, fn_def_id)
358 }
359
360 fn adt_variance(&self, adt_id: chalk_ir::AdtId<Interner>) -> chalk_ir::Variances<Interner> {
361 self.db.adt_variance(self.krate, adt_id)
362 }
346} 363}
347 364
348pub(crate) fn program_clauses_for_chalk_env_query( 365pub(crate) fn program_clauses_for_chalk_env_query(
@@ -644,6 +661,32 @@ pub(crate) fn fn_def_datum_query(
644 Arc::new(datum) 661 Arc::new(datum)
645} 662}
646 663
664pub(crate) fn fn_def_variance_query(
665 db: &dyn HirDatabase,
666 _krate: CrateId,
667 fn_def_id: FnDefId,
668) -> Variances {
669 let callable_def: CallableDefId = from_chalk(db, fn_def_id);
670 let generic_params = generics(db.upcast(), callable_def.into());
671 Variances::from(
672 &Interner,
673 std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()),
674 )
675}
676
677pub(crate) fn adt_variance_query(
678 db: &dyn HirDatabase,
679 _krate: CrateId,
680 adt_id: AdtId,
681) -> Variances {
682 let adt: crate::AdtId = from_chalk(db, adt_id);
683 let generic_params = generics(db.upcast(), adt.into());
684 Variances::from(
685 &Interner,
686 std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()),
687 )
688}
689
647impl From<FnDefId> for crate::db::InternedCallableDefId { 690impl From<FnDefId> for crate::db::InternedCallableDefId {
648 fn from(fn_def_id: FnDefId) -> Self { 691 fn from(fn_def_id: FnDefId) -> Self {
649 InternKey::from_intern_id(fn_def_id.0) 692 InternKey::from_intern_id(fn_def_id.0)
diff --git a/crates/hir_ty/src/traits/chalk/interner.rs b/crates/hir_ty/src/traits/chalk/interner.rs
index 39569e690..6a4aa8333 100644
--- a/crates/hir_ty/src/traits/chalk/interner.rs
+++ b/crates/hir_ty/src/traits/chalk/interner.rs
@@ -25,6 +25,7 @@ pub(crate) type FnDefId = chalk_ir::FnDefId<Interner>;
25pub(crate) type FnDefDatum = chalk_solve::rust_ir::FnDefDatum<Interner>; 25pub(crate) type FnDefDatum = chalk_solve::rust_ir::FnDefDatum<Interner>;
26pub(crate) type OpaqueTyId = chalk_ir::OpaqueTyId<Interner>; 26pub(crate) type OpaqueTyId = chalk_ir::OpaqueTyId<Interner>;
27pub(crate) type OpaqueTyDatum = chalk_solve::rust_ir::OpaqueTyDatum<Interner>; 27pub(crate) type OpaqueTyDatum = chalk_solve::rust_ir::OpaqueTyDatum<Interner>;
28pub(crate) type Variances = chalk_ir::Variances<Interner>;
28 29
29impl chalk_ir::interner::Interner for Interner { 30impl chalk_ir::interner::Interner for Interner {
30 type InternedType = Arc<chalk_ir::TyData<Self>>; 31 type InternedType = Arc<chalk_ir::TyData<Self>>;
@@ -41,6 +42,7 @@ impl chalk_ir::interner::Interner for Interner {
41 type InternedVariableKinds = Vec<chalk_ir::VariableKind<Self>>; 42 type InternedVariableKinds = Vec<chalk_ir::VariableKind<Self>>;
42 type InternedCanonicalVarKinds = Vec<chalk_ir::CanonicalVarKind<Self>>; 43 type InternedCanonicalVarKinds = Vec<chalk_ir::CanonicalVarKind<Self>>;
43 type InternedConstraints = Vec<chalk_ir::InEnvironment<chalk_ir::Constraint<Self>>>; 44 type InternedConstraints = Vec<chalk_ir::InEnvironment<chalk_ir::Constraint<Self>>>;
45 type InternedVariances = Arc<[chalk_ir::Variance]>;
44 type DefId = InternId; 46 type DefId = InternId;
45 type InternedAdtId = hir_def::AdtId; 47 type InternedAdtId = hir_def::AdtId;
46 type Identifier = TypeAliasId; 48 type Identifier = TypeAliasId;
@@ -370,6 +372,20 @@ impl chalk_ir::interner::Interner for Interner {
370 ) -> Option<fmt::Result> { 372 ) -> Option<fmt::Result> {
371 None 373 None
372 } 374 }
375
376 fn intern_variances<E>(
377 &self,
378 data: impl IntoIterator<Item = Result<chalk_ir::Variance, E>>,
379 ) -> Result<Self::InternedVariances, E> {
380 data.into_iter().collect()
381 }
382
383 fn variances_data<'a>(
384 &self,
385 variances: &'a Self::InternedVariances,
386 ) -> &'a [chalk_ir::Variance] {
387 &variances
388 }
373} 389}
374 390
375impl chalk_ir::interner::HasInterner for Interner { 391impl chalk_ir::interner::HasInterner for Interner {
diff --git a/crates/hir_ty/src/traits/chalk/mapping.rs b/crates/hir_ty/src/traits/chalk/mapping.rs
index 86cbc4c7e..8700d664e 100644
--- a/crates/hir_ty/src/traits/chalk/mapping.rs
+++ b/crates/hir_ty/src/traits/chalk/mapping.rs
@@ -31,7 +31,8 @@ impl ToChalk for Ty {
31 TypeCtor::Ref(m) => ref_to_chalk(db, m, apply_ty.parameters), 31 TypeCtor::Ref(m) => ref_to_chalk(db, m, apply_ty.parameters),
32 TypeCtor::Array => array_to_chalk(db, apply_ty.parameters), 32 TypeCtor::Array => array_to_chalk(db, apply_ty.parameters),
33 TypeCtor::FnPtr { num_args: _, is_varargs } => { 33 TypeCtor::FnPtr { num_args: _, is_varargs } => {
34 let substitution = apply_ty.parameters.to_chalk(db).shifted_in(&Interner); 34 let substitution =
35 chalk_ir::FnSubst(apply_ty.parameters.to_chalk(db).shifted_in(&Interner));
35 chalk_ir::TyKind::Function(chalk_ir::FnPointer { 36 chalk_ir::TyKind::Function(chalk_ir::FnPointer {
36 num_binders: 0, 37 num_binders: 0,
37 sig: chalk_ir::FnSig { 38 sig: chalk_ir::FnSig {
@@ -183,7 +184,7 @@ impl ToChalk for Ty {
183 assert_eq!(num_binders, 0); 184 assert_eq!(num_binders, 0);
184 let parameters: Substs = from_chalk( 185 let parameters: Substs = from_chalk(
185 db, 186 db,
186 substitution.shifted_out(&Interner).expect("fn ptr should have no binders"), 187 substitution.0.shifted_out(&Interner).expect("fn ptr should have no binders"),
187 ); 188 );
188 Ty::Apply(ApplicationTy { 189 Ty::Apply(ApplicationTy {
189 ctor: TypeCtor::FnPtr { 190 ctor: TypeCtor::FnPtr {
@@ -536,6 +537,7 @@ impl ToChalk for GenericPredicate {
536 // we don't produce any where clauses with binders and can't currently deal with them 537 // we don't produce any where clauses with binders and can't currently deal with them
537 match where_clause 538 match where_clause
538 .skip_binders() 539 .skip_binders()
540 .clone()
539 .shifted_out(&Interner) 541 .shifted_out(&Interner)
540 .expect("unexpected bound vars in where clause") 542 .expect("unexpected bound vars in where clause")
541 { 543 {
@@ -661,7 +663,12 @@ where
661 chalk_ir::TyVariableKind::Integer => TyKind::Integer, 663 chalk_ir::TyVariableKind::Integer => TyKind::Integer,
662 chalk_ir::TyVariableKind::Float => TyKind::Float, 664 chalk_ir::TyVariableKind::Float => TyKind::Float,
663 }, 665 },
664 chalk_ir::VariableKind::Lifetime => panic!("unexpected lifetime from Chalk"), 666 // HACK: Chalk can sometimes return new lifetime variables. We
667 // want to just skip them, but to not mess up the indices of
668 // other variables, we'll just create a new type variable in
669 // their place instead. This should not matter (we never see the
670 // actual *uses* of the lifetime variable).
671 chalk_ir::VariableKind::Lifetime => TyKind::General,
665 chalk_ir::VariableKind::Const(_) => panic!("unexpected const from Chalk"), 672 chalk_ir::VariableKind::Const(_) => panic!("unexpected const from Chalk"),
666 }) 673 })
667 .collect(); 674 .collect();