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-rw-r--r--crates/hir_ty/src/lib.rs27
-rw-r--r--crates/hir_ty/src/lower.rs9
-rw-r--r--crates/hir_ty/src/traits/chalk/interner.rs7
3 files changed, 29 insertions, 14 deletions
diff --git a/crates/hir_ty/src/lib.rs b/crates/hir_ty/src/lib.rs
index 503910dde..850385280 100644
--- a/crates/hir_ty/src/lib.rs
+++ b/crates/hir_ty/src/lib.rs
@@ -31,6 +31,7 @@ use hir_def::{
31 GenericDefId, HasModule, LifetimeParamId, Lookup, TraitId, TypeAliasId, TypeParamId, 31 GenericDefId, HasModule, LifetimeParamId, Lookup, TraitId, TypeAliasId, TypeParamId,
32}; 32};
33use itertools::Itertools; 33use itertools::Itertools;
34use smallvec::SmallVec;
34 35
35use crate::{ 36use crate::{
36 db::HirDatabase, 37 db::HirDatabase,
@@ -272,7 +273,7 @@ impl Ty {
272 273
273/// A list of substitutions for generic parameters. 274/// A list of substitutions for generic parameters.
274#[derive(Clone, PartialEq, Eq, Debug, Hash)] 275#[derive(Clone, PartialEq, Eq, Debug, Hash)]
275pub struct Substs(Arc<[Ty]>); 276pub struct Substs(SmallVec<[Ty; 2]>);
276 277
277impl TypeWalk for Substs { 278impl TypeWalk for Substs {
278 fn walk(&self, f: &mut impl FnMut(&Ty)) { 279 fn walk(&self, f: &mut impl FnMut(&Ty)) {
@@ -286,19 +287,27 @@ impl TypeWalk for Substs {
286 f: &mut impl FnMut(&mut Ty, DebruijnIndex), 287 f: &mut impl FnMut(&mut Ty, DebruijnIndex),
287 binders: DebruijnIndex, 288 binders: DebruijnIndex,
288 ) { 289 ) {
289 for t in make_mut_slice(&mut self.0) { 290 for t in &mut self.0 {
290 t.walk_mut_binders(f, binders); 291 t.walk_mut_binders(f, binders);
291 } 292 }
292 } 293 }
293} 294}
294 295
295impl Substs { 296impl Substs {
297 pub fn interned(&self, _: &Interner) -> &[Ty] {
298 &self.0
299 }
300
296 pub fn empty() -> Substs { 301 pub fn empty() -> Substs {
297 Substs(Arc::new([])) 302 Substs(SmallVec::new())
298 } 303 }
299 304
300 pub fn single(ty: Ty) -> Substs { 305 pub fn single(ty: Ty) -> Substs {
301 Substs(Arc::new([ty])) 306 Substs({
307 let mut v = SmallVec::new();
308 v.push(ty);
309 v
310 })
302 } 311 }
303 312
304 pub fn prefix(&self, n: usize) -> Substs { 313 pub fn prefix(&self, n: usize) -> Substs {
@@ -316,6 +325,10 @@ impl Substs {
316 &self.0[0] 325 &self.0[0]
317 } 326 }
318 327
328 pub fn from_iter(_interner: &Interner, elements: impl IntoIterator<Item = Ty>) -> Self {
329 Substs(elements.into_iter().collect())
330 }
331
319 /// Return Substs that replace each parameter by itself (i.e. `Ty::Param`). 332 /// Return Substs that replace each parameter by itself (i.e. `Ty::Param`).
320 pub(crate) fn type_params_for_generics( 333 pub(crate) fn type_params_for_generics(
321 db: &dyn HirDatabase, 334 db: &dyn HirDatabase,
@@ -600,13 +613,13 @@ impl CallableSig {
600 613
601 pub fn from_fn_ptr(fn_ptr: &FnPointer) -> CallableSig { 614 pub fn from_fn_ptr(fn_ptr: &FnPointer) -> CallableSig {
602 CallableSig { 615 CallableSig {
603 params_and_return: Arc::clone(&fn_ptr.substs.0), 616 params_and_return: fn_ptr.substs.interned(&Interner).iter().cloned().collect(),
604 is_varargs: fn_ptr.sig.variadic, 617 is_varargs: fn_ptr.sig.variadic,
605 } 618 }
606 } 619 }
607 620
608 pub fn from_substs(substs: &Substs) -> CallableSig { 621 pub fn from_substs(substs: &Substs) -> CallableSig {
609 CallableSig { params_and_return: Arc::clone(&substs.0), is_varargs: false } 622 CallableSig { params_and_return: substs.iter().cloned().collect(), is_varargs: false }
610 } 623 }
611 624
612 pub fn params(&self) -> &[Ty] { 625 pub fn params(&self) -> &[Ty] {
@@ -649,7 +662,7 @@ impl Ty {
649 TyKind::Function(FnPointer { 662 TyKind::Function(FnPointer {
650 num_args: sig.params().len(), 663 num_args: sig.params().len(),
651 sig: FnSig { abi: (), safety: Safety::Safe, variadic: sig.is_varargs }, 664 sig: FnSig { abi: (), safety: Safety::Safe, variadic: sig.is_varargs },
652 substs: Substs(sig.params_and_return), 665 substs: Substs::from_iter(&Interner, sig.params_and_return.iter().cloned()),
653 }) 666 })
654 .intern(&Interner) 667 .intern(&Interner)
655 } 668 }
diff --git a/crates/hir_ty/src/lower.rs b/crates/hir_ty/src/lower.rs
index b4c650fa1..6ab757bfc 100644
--- a/crates/hir_ty/src/lower.rs
+++ b/crates/hir_ty/src/lower.rs
@@ -31,7 +31,7 @@ use crate::{
31 traits::chalk::{Interner, ToChalk}, 31 traits::chalk::{Interner, ToChalk},
32 utils::{ 32 utils::{
33 all_super_trait_refs, associated_type_by_name_including_super_traits, generics, 33 all_super_trait_refs, associated_type_by_name_including_super_traits, generics,
34 make_mut_slice, variant_data, 34 variant_data,
35 }, 35 },
36 AliasTy, Binders, BoundVar, CallableSig, DebruijnIndex, FnPointer, FnSig, GenericPredicate, 36 AliasTy, Binders, BoundVar, CallableSig, DebruijnIndex, FnPointer, FnSig, GenericPredicate,
37 ImplTraitId, OpaqueTy, PolyFnSig, ProjectionPredicate, ProjectionTy, ReturnTypeImplTrait, 37 ImplTraitId, OpaqueTy, PolyFnSig, ProjectionPredicate, ProjectionTy, ReturnTypeImplTrait,
@@ -150,8 +150,9 @@ impl<'a> TyLoweringContext<'a> {
150 let ty = match type_ref { 150 let ty = match type_ref {
151 TypeRef::Never => TyKind::Never.intern(&Interner), 151 TypeRef::Never => TyKind::Never.intern(&Interner),
152 TypeRef::Tuple(inner) => { 152 TypeRef::Tuple(inner) => {
153 let inner_tys: Arc<[Ty]> = inner.iter().map(|tr| self.lower_ty(tr)).collect(); 153 let inner_tys = inner.iter().map(|tr| self.lower_ty(tr));
154 TyKind::Tuple(inner_tys.len(), Substs(inner_tys)).intern(&Interner) 154 TyKind::Tuple(inner_tys.len(), Substs::from_iter(&Interner, inner_tys))
155 .intern(&Interner)
155 } 156 }
156 TypeRef::Path(path) => { 157 TypeRef::Path(path) => {
157 let (ty, res_) = self.lower_path(path); 158 let (ty, res_) = self.lower_path(path);
@@ -638,7 +639,7 @@ impl<'a> TyLoweringContext<'a> {
638 ) -> TraitRef { 639 ) -> TraitRef {
639 let mut substs = self.trait_ref_substs_from_path(segment, resolved); 640 let mut substs = self.trait_ref_substs_from_path(segment, resolved);
640 if let Some(self_ty) = explicit_self_ty { 641 if let Some(self_ty) = explicit_self_ty {
641 make_mut_slice(&mut substs.0)[0] = self_ty; 642 substs.0[0] = self_ty;
642 } 643 }
643 TraitRef { trait_: resolved, substs } 644 TraitRef { trait_: resolved, substs }
644 } 645 }
diff --git a/crates/hir_ty/src/traits/chalk/interner.rs b/crates/hir_ty/src/traits/chalk/interner.rs
index 1dc3f497d..94e94a26d 100644
--- a/crates/hir_ty/src/traits/chalk/interner.rs
+++ b/crates/hir_ty/src/traits/chalk/interner.rs
@@ -5,6 +5,7 @@ use super::tls;
5use base_db::salsa::InternId; 5use base_db::salsa::InternId;
6use chalk_ir::{GenericArg, Goal, GoalData}; 6use chalk_ir::{GenericArg, Goal, GoalData};
7use hir_def::TypeAliasId; 7use hir_def::TypeAliasId;
8use smallvec::SmallVec;
8use std::{fmt, sync::Arc}; 9use std::{fmt, sync::Arc};
9 10
10#[derive(Debug, Copy, Clone, Hash, PartialOrd, Ord, PartialEq, Eq)] 11#[derive(Debug, Copy, Clone, Hash, PartialOrd, Ord, PartialEq, Eq)]
@@ -33,7 +34,7 @@ impl chalk_ir::interner::Interner for Interner {
33 type InternedGenericArg = chalk_ir::GenericArgData<Self>; 34 type InternedGenericArg = chalk_ir::GenericArgData<Self>;
34 type InternedGoal = Arc<GoalData<Self>>; 35 type InternedGoal = Arc<GoalData<Self>>;
35 type InternedGoals = Vec<Goal<Self>>; 36 type InternedGoals = Vec<Goal<Self>>;
36 type InternedSubstitution = Vec<GenericArg<Self>>; 37 type InternedSubstitution = SmallVec<[GenericArg<Self>; 2]>;
37 type InternedProgramClause = Arc<chalk_ir::ProgramClauseData<Self>>; 38 type InternedProgramClause = Arc<chalk_ir::ProgramClauseData<Self>>;
38 type InternedProgramClauses = Arc<[chalk_ir::ProgramClause<Self>]>; 39 type InternedProgramClauses = Arc<[chalk_ir::ProgramClause<Self>]>;
39 type InternedQuantifiedWhereClauses = Vec<chalk_ir::QuantifiedWhereClause<Self>>; 40 type InternedQuantifiedWhereClauses = Vec<chalk_ir::QuantifiedWhereClause<Self>>;
@@ -265,13 +266,13 @@ impl chalk_ir::interner::Interner for Interner {
265 fn intern_substitution<E>( 266 fn intern_substitution<E>(
266 &self, 267 &self,
267 data: impl IntoIterator<Item = Result<GenericArg<Self>, E>>, 268 data: impl IntoIterator<Item = Result<GenericArg<Self>, E>>,
268 ) -> Result<Vec<GenericArg<Self>>, E> { 269 ) -> Result<Self::InternedSubstitution, E> {
269 data.into_iter().collect() 270 data.into_iter().collect()
270 } 271 }
271 272
272 fn substitution_data<'a>( 273 fn substitution_data<'a>(
273 &self, 274 &self,
274 substitution: &'a Vec<GenericArg<Self>>, 275 substitution: &'a Self::InternedSubstitution,
275 ) -> &'a [GenericArg<Self>] { 276 ) -> &'a [GenericArg<Self>] {
276 substitution 277 substitution
277 } 278 }