Remove lower::value_ty in favor of lower_nextsolver::value_ty

Author: jackh726

crates/hir-ty/src/db.rs

@@ -127,8 +127,11 @@ pub trait HirDatabase: DefDatabase + std::fmt::Debug {
 
     /// Returns the type of the value of the given constant, or `None` if the `ValueTyDefId` is
     /// a `StructId` or `EnumVariantId` with a record constructor.
-    #[salsa::invoke(crate::lower::value_ty_query)]
-    fn value_ty(&self, def: ValueTyDefId) -> Option<Binders<Ty>>;
+    #[salsa::invoke(crate::lower_nextsolver::value_ty_query)]
+    fn value_ty<'db>(
+        &'db self,
+        def: ValueTyDefId,
+    ) -> Option<crate::next_solver::EarlyBinder<'db, crate::next_solver::Ty<'db>>>;
 
     #[salsa::invoke(crate::lower::impl_self_ty_with_diagnostics_query)]
     #[salsa::cycle(cycle_result = crate::lower::impl_self_ty_with_diagnostics_cycle_result)]
@@ -280,14 +283,6 @@ pub trait HirDatabase: DefDatabase + std::fmt::Debug {
 
     // next trait solver
 
-    /// Returns the type of the value of the given constant, or `None` if the `ValueTyDefId` is
-    /// a `StructId` or `EnumVariantId` with a record constructor.
-    #[salsa::invoke(crate::lower_nextsolver::value_ty_query)]
-    fn value_ty_ns<'db>(
-        &'db self,
-        def: ValueTyDefId,
-    ) -> Option<crate::next_solver::EarlyBinder<'db, crate::next_solver::Ty<'db>>>;
-
     #[salsa::invoke(crate::lower_nextsolver::type_for_type_alias_with_diagnostics_query)]
     #[salsa::cycle(cycle_result = crate::lower_nextsolver::type_for_type_alias_with_diagnostics_cycle_result)]
     fn type_for_type_alias_with_diagnostics_ns<'db>(

crates/hir-ty/src/infer/expr.rs

@@ -23,13 +23,13 @@ use syntax::ast::RangeOp;
 use tracing::debug;
 
 use crate::autoderef::overloaded_deref_ty;
-use crate::next_solver::ErrorGuaranteed;
 use crate::next_solver::infer::DefineOpaqueTypes;
 use crate::next_solver::obligation_ctxt::ObligationCtxt;
+use crate::next_solver::{DbInterner, ErrorGuaranteed};
 use crate::{
-    Adjust, Adjustment, AdtId, AutoBorrow, Binders, CallableDefId, CallableSig, DeclContext,
-    DeclOrigin, IncorrectGenericsLenKind, Interner, LifetimeElisionKind, Rawness, Scalar,
-    Substitution, TraitEnvironment, TraitRef, Ty, TyBuilder, TyExt, TyKind, consteval,
+    Adjust, Adjustment, AdtId, AutoBorrow, CallableDefId, CallableSig, DeclContext, DeclOrigin,
+    IncorrectGenericsLenKind, Interner, LifetimeElisionKind, Rawness, Scalar, Substitution,
+    TraitEnvironment, TraitRef, Ty, TyBuilder, TyExt, TyKind, consteval,
     generics::generics,
     infer::{
         AllowTwoPhase, BreakableKind,
@@ -1481,7 +1481,10 @@ impl<'db> InferenceContext<'db> {
 
         self.write_method_resolution(tgt_expr, func, subst.clone());
 
-        let method_ty = self.db.value_ty(func.into()).unwrap().substitute(Interner, &subst);
+        let interner = DbInterner::new_with(self.db, None, None);
+        let args: crate::next_solver::GenericArgs<'_> = subst.to_nextsolver(interner);
+        let method_ty =
+            self.db.value_ty(func.into()).unwrap().instantiate(interner, args).to_chalk(interner);
         self.register_obligations_for_call(&method_ty);
 
         self.infer_expr_coerce(rhs, &Expectation::has_type(rhs_ty.clone()), ExprIsRead::Yes);
@@ -1800,11 +1803,17 @@ impl<'db> InferenceContext<'db> {
                         self.write_expr_adj(receiver, adjustments.into_boxed_slice());
                         self.write_method_resolution(tgt_expr, func, substs.clone());
 
+                        let interner = DbInterner::new_with(self.db, None, None);
+                        let args: crate::next_solver::GenericArgs<'_> =
+                            substs.to_nextsolver(interner);
                         self.check_method_call(
                             tgt_expr,
                             &[],
-                            self.db.value_ty(func.into()).unwrap(),
-                            substs,
+                            self.db
+                                .value_ty(func.into())
+                                .unwrap()
+                                .instantiate(interner, args)
+                                .to_chalk(interner),
                             ty,
                             expected,
                         )
@@ -1963,11 +1972,16 @@ impl<'db> InferenceContext<'db> {
 
                 let substs = self.substs_for_method_call(tgt_expr, func.into(), generic_args);
                 self.write_method_resolution(tgt_expr, func, substs.clone());
+                let interner = DbInterner::new_with(self.db, None, None);
+                let gen_args: crate::next_solver::GenericArgs<'_> = substs.to_nextsolver(interner);
                 self.check_method_call(
                     tgt_expr,
                     args,
-                    self.db.value_ty(func.into()).expect("we have a function def"),
-                    substs,
+                    self.db
+                        .value_ty(func.into())
+                        .expect("we have a function def")
+                        .instantiate(interner, gen_args)
+                        .to_chalk(interner),
                     ty,
                     expected,
                 )
@@ -2012,11 +2026,15 @@ impl<'db> InferenceContext<'db> {
                 let recovered = match assoc_func_with_same_name {
                     Some(f) => {
                         let substs = self.substs_for_method_call(tgt_expr, f.into(), generic_args);
+                        let interner = DbInterner::new_with(self.db, None, None);
+                        let args: crate::next_solver::GenericArgs<'_> =
+                            substs.to_nextsolver(interner);
                         let f = self
                             .db
                             .value_ty(f.into())
                             .expect("we have a function def")
-                            .substitute(Interner, &substs);
+                            .instantiate(interner, args)
+                            .to_chalk(interner);
                         let sig = f.callable_sig(self.db).expect("we have a function def");
                         Some((f, sig, true))
                     }
@@ -2056,12 +2074,10 @@ impl<'db> InferenceContext<'db> {
         &mut self,
         tgt_expr: ExprId,
         args: &[ExprId],
-        method_ty: Binders<Ty>,
-        substs: Substitution,
+        method_ty: Ty,
         receiver_ty: Ty,
         expected: &Expectation,
     ) -> Ty {
-        let method_ty = method_ty.substitute(Interner, &substs);
         self.register_obligations_for_call(&method_ty);
         let interner = self.table.interner;
         let ((formal_receiver_ty, param_tys), ret_ty, is_varargs) =

crates/hir-ty/src/infer/path.rs

@@ -17,7 +17,10 @@ use crate::{
     generics::generics,
     infer::diagnostics::InferenceTyLoweringContext as TyLoweringContext,
     method_resolution::{self, VisibleFromModule},
-    next_solver::mapping::ChalkToNextSolver,
+    next_solver::{
+        DbInterner,
+        mapping::{ChalkToNextSolver, NextSolverToChalk},
+    },
     to_chalk_trait_id,
 };
 
@@ -36,7 +39,9 @@ impl<'db> InferenceContext<'db> {
 
         self.add_required_obligations_for_value_path(generic_def, &substs);
 
-        let ty = self.db.value_ty(value_def)?.substitute(Interner, &substs);
+        let interner = DbInterner::new_with(self.db, None, None);
+        let args: crate::next_solver::GenericArgs<'_> = substs.to_nextsolver(interner);
+        let ty = self.db.value_ty(value_def)?.instantiate(interner, args).to_chalk(interner);
         let ty = self.process_remote_user_written_ty(ty);
         Some(ty)
     }
@@ -89,9 +94,9 @@ impl<'db> InferenceContext<'db> {
 
         let generic_def = value_def.to_generic_def_id(self.db);
         if let GenericDefId::StaticId(_) = generic_def {
+            let interner = DbInterner::new_with(self.db, None, None);
             // `Static` is the kind of item that can never be generic currently. We can just skip the binders to get its type.
-            let (ty, binders) = self.db.value_ty(value_def)?.into_value_and_skipped_binders();
-            stdx::always!(binders.is_empty(Interner), "non-empty binders for non-generic def",);
+            let ty = self.db.value_ty(value_def)?.skip_binder().to_chalk(interner);
             return Some(ValuePathResolution::NonGeneric(ty));
         };
 

crates/hir-ty/src/lower.rs

@@ -30,7 +30,6 @@ use hir_def::{
     builtin_type::BuiltinType,
     expr_store::{ExpressionStore, path::Path},
     hir::generics::{GenericParamDataRef, TypeOrConstParamData, WherePredicate},
-    item_tree::FieldsShape,
     lang_item::LangItem,
     resolver::{HasResolver, LifetimeNs, Resolver, TypeNs},
     signatures::{FunctionSignature, TraitFlags, TypeAliasFlags},
@@ -59,7 +58,7 @@ use crate::{
         path::{PathDiagnosticCallback, PathLoweringContext},
     },
     make_binders,
-    mapping::{ToChalk, from_chalk_trait_id, lt_to_placeholder_idx},
+    mapping::{from_chalk_trait_id, lt_to_placeholder_idx},
     static_lifetime, to_chalk_trait_id, to_placeholder_idx,
     utils::all_super_trait_refs,
     variable_kinds_from_iter,
@@ -1352,51 +1351,6 @@ fn fn_sig_for_fn(db: &dyn HirDatabase, def: FunctionId) -> PolyFnSig {
     make_binders(db, &generics, sig)
 }
 
-/// Build the declared type of a function. This should not need to look at the
-/// function body.
-fn type_for_fn(db: &dyn HirDatabase, def: FunctionId) -> Binders<Ty> {
-    let generics = generics(db, def.into());
-    let substs = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
-    make_binders(
-        db,
-        &generics,
-        TyKind::FnDef(CallableDefId::FunctionId(def).to_chalk(db), substs).intern(Interner),
-    )
-}
-
-/// Build the declared type of a const.
-fn type_for_const(db: &dyn HirDatabase, def: ConstId) -> Binders<Ty> {
-    let data = db.const_signature(def);
-    let generics = generics(db, def.into());
-    let resolver = def.resolver(db);
-    let parent = def.loc(db).container;
-    let mut ctx = TyLoweringContext::new(
-        db,
-        &resolver,
-        &data.store,
-        def.into(),
-        LifetimeElisionKind::for_const(parent),
-    )
-    .with_type_param_mode(ParamLoweringMode::Variable);
-
-    make_binders(db, &generics, ctx.lower_ty(data.type_ref))
-}
-
-/// Build the declared type of a static.
-fn type_for_static(db: &dyn HirDatabase, def: StaticId) -> Binders<Ty> {
-    let data = db.static_signature(def);
-    let resolver = def.resolver(db);
-    let mut ctx = TyLoweringContext::new(
-        db,
-        &resolver,
-        &data.store,
-        def.into(),
-        LifetimeElisionKind::Elided(static_lifetime()),
-    );
-
-    Binders::empty(Interner, ctx.lower_ty(data.type_ref))
-}
-
 fn fn_sig_for_struct_constructor(db: &dyn HirDatabase, def: StructId) -> PolyFnSig {
     let field_tys = db.field_types(def.into());
     let params = field_tys.iter().map(|(_, ty)| ty.skip_binders().clone());
@@ -1407,24 +1361,6 @@ fn fn_sig_for_struct_constructor(db: &dyn HirDatabase, def: StructId) -> PolyFnS
     )
 }
 
-/// Build the type of a tuple struct constructor.
-fn type_for_struct_constructor(db: &dyn HirDatabase, def: StructId) -> Option<Binders<Ty>> {
-    let struct_data = def.fields(db);
-    match struct_data.shape {
-        FieldsShape::Record => None,
-        FieldsShape::Unit => Some(type_for_adt(db, def.into())),
-        FieldsShape::Tuple => {
-            let generics = generics(db, AdtId::from(def).into());
-            let substs = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
-            Some(make_binders(
-                db,
-                &generics,
-                TyKind::FnDef(CallableDefId::StructId(def).to_chalk(db), substs).intern(Interner),
-            ))
-        }
-    }
-}
-
 fn fn_sig_for_enum_variant_constructor(db: &dyn HirDatabase, def: EnumVariantId) -> PolyFnSig {
     let field_tys = db.field_types(def.into());
     let params = field_tys.iter().map(|(_, ty)| ty.skip_binders().clone());
@@ -1436,28 +1372,6 @@ fn fn_sig_for_enum_variant_constructor(db: &dyn HirDatabase, def: EnumVariantId)
     )
 }
 
-/// Build the type of a tuple enum variant constructor.
-fn type_for_enum_variant_constructor(
-    db: &dyn HirDatabase,
-    def: EnumVariantId,
-) -> Option<Binders<Ty>> {
-    let e = def.lookup(db).parent;
-    match def.fields(db).shape {
-        FieldsShape::Record => None,
-        FieldsShape::Unit => Some(type_for_adt(db, e.into())),
-        FieldsShape::Tuple => {
-            let generics = generics(db, e.into());
-            let substs = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
-            Some(make_binders(
-                db,
-                &generics,
-                TyKind::FnDef(CallableDefId::EnumVariantId(def).to_chalk(db), substs)
-                    .intern(Interner),
-            ))
-        }
-    }
-}
-
 fn type_for_adt(db: &dyn HirDatabase, adt: AdtId) -> Binders<Ty> {
     let generics = generics(db, adt.into());
     let subst = generics.bound_vars_subst(db, DebruijnIndex::INNERMOST);
@@ -1537,17 +1451,6 @@ impl ValueTyDefId {
     }
 }
 
-pub(crate) fn value_ty_query(db: &dyn HirDatabase, def: ValueTyDefId) -> Option<Binders<Ty>> {
-    match def {
-        ValueTyDefId::FunctionId(it) => Some(type_for_fn(db, it)),
-        ValueTyDefId::StructId(it) => type_for_struct_constructor(db, it),
-        ValueTyDefId::UnionId(it) => Some(type_for_adt(db, it.into())),
-        ValueTyDefId::EnumVariantId(it) => type_for_enum_variant_constructor(db, it),
-        ValueTyDefId::ConstId(it) => Some(type_for_const(db, it)),
-        ValueTyDefId::StaticId(it) => Some(type_for_static(db, it)),
-    }
-}
-
 pub(crate) fn impl_self_ty_query(db: &dyn HirDatabase, impl_id: ImplId) -> Binders<Ty> {
     db.impl_self_ty_with_diagnostics(impl_id).0
 }

crates/hir-ty/src/next_solver/interner.rs

@@ -1099,15 +1099,13 @@ impl<'db> rustc_type_ir::Interner for DbInterner<'db> {
             // We currently always use the type from HIR typeck which ignores regions. This
             // should be fine.
             SolverDefId::InternedOpaqueTyId(_) => self.type_of_opaque_hir_typeck(def_id),
-            SolverDefId::FunctionId(id) => self.db.value_ty_ns(id.into()).unwrap(),
+            SolverDefId::FunctionId(id) => self.db.value_ty(id.into()).unwrap(),
             SolverDefId::Ctor(id) => {
                 let id = match id {
                     Ctor::Struct(id) => id.into(),
                     Ctor::Enum(id) => id.into(),
                 };
-                self.db
-                    .value_ty_ns(id)
-                    .expect("`SolverDefId::Ctor` should have a function-like ctor")
+                self.db.value_ty(id).expect("`SolverDefId::Ctor` should have a function-like ctor")
             }
             _ => panic!("Unexpected def_id `{def_id:?}` provided for `type_of`"),
         }

crates/hir/src/lib.rs

@@ -4872,6 +4872,7 @@ impl<'db> Type<'db> {
         let Some(ty) = db.value_ty(def.into()) else {
             return Type::new(db, def, TyKind::Error.intern(Interner));
         };
+        let interner = DbInterner::new_with(db, None, None);
         let substs = TyBuilder::unknown_subst(
             db,
             match def.into() {
@@ -4882,10 +4883,13 @@ impl<'db> Type<'db> {
                 ValueTyDefId::EnumVariantId(it) => {
                     GenericDefId::AdtId(AdtId::EnumId(it.lookup(db).parent))
                 }
-                ValueTyDefId::StaticId(_) => return Type::new(db, def, ty.skip_binders().clone()),
+                ValueTyDefId::StaticId(_) => {
+                    return Type::new(db, def, ty.skip_binder().to_chalk(interner));
+                }
             },
         );
-        Type::new(db, def, ty.substitute(Interner, &substs))
+        let args: crate::next_solver::GenericArgs<'_> = substs.to_nextsolver(interner);
+        Type::new(db, def, ty.instantiate(interner, args).to_chalk(interner))
     }
 
     pub fn new_slice(ty: Self) -> Self {

crates/hir/src/source_analyzer.rs

@@ -46,6 +46,10 @@ use hir_ty::{
     from_assoc_type_id,
     lang_items::lang_items_for_bin_op,
     method_resolution,
+    next_solver::{
+        DbInterner,
+        mapping::{ChalkToNextSolver, NextSolverToChalk},
+    },
 };
 use intern::sym;
 use itertools::Itertools;
@@ -372,8 +376,10 @@ impl<'db> SourceAnalyzer<'db> {
     ) -> Option<Callable<'db>> {
         let expr_id = self.expr_id(call.clone().into())?.as_expr()?;
         let (func, substs) = self.infer()?.method_resolution(expr_id)?;
-        let ty = db.value_ty(func.into())?.substitute(Interner, &substs);
-        let ty = Type::new_with_resolver(db, &self.resolver, ty);
+        let interner = DbInterner::new_with(db, None, None);
+        let args: hir_ty::next_solver::GenericArgs<'_> = substs.to_nextsolver(interner);
+        let ty = db.value_ty(func.into())?.instantiate(interner, args);
+        let ty = Type::new_with_resolver(db, &self.resolver, ty.to_chalk(interner));
         let mut res = ty.as_callable(db)?;
         res.is_bound_method = true;
         Some(res)

crates/ide-db/src/syntax_helpers/suggest_name.rs

@@ -473,7 +473,7 @@ mod tests {
             frange.range,
             "selection is not an expression(yet contained in one)"
         );
-        let name = NameGenerator::default().for_variable(&expr, &sema);
+        let name = salsa::attach(sema.db, || NameGenerator::default().for_variable(&expr, &sema));
         assert_eq!(&name, expected);
     }