From fdd721e9ef4d330351769a7498d459a198bf0a0b Mon Sep 17 00:00:00 2001 From: Florian Diebold Date: Wed, 7 Apr 2021 19:35:24 +0200 Subject: Improve indexing of impls Store impls for e.g. &Foo with the ones for Foo instead of the big "other" bucket. This can improve performance and simplifies the HIR impl search a bit. --- crates/hir_ty/src/method_resolution.rs | 81 ++++++++++++++++++++++++++-------- 1 file changed, 63 insertions(+), 18 deletions(-) (limited to 'crates/hir_ty/src/method_resolution.rs') diff --git a/crates/hir_ty/src/method_resolution.rs b/crates/hir_ty/src/method_resolution.rs index be3e4f09a..55c7b1a09 100644 --- a/crates/hir_ty/src/method_resolution.rs +++ b/crates/hir_ty/src/method_resolution.rs @@ -13,6 +13,7 @@ use hir_def::{ }; use hir_expand::name::Name; use rustc_hash::{FxHashMap, FxHashSet}; +use stdx::always; use crate::{ autoderef, @@ -21,32 +22,36 @@ use crate::{ primitive::{self, FloatTy, IntTy, UintTy}, static_lifetime, utils::all_super_traits, - AdtId, Canonical, CanonicalVarKinds, DebruijnIndex, FnPointer, FnSig, ForeignDefId, - InEnvironment, Interner, Scalar, Substitution, TraitEnvironment, TraitRefExt, Ty, TyBuilder, - TyExt, TyKind, + AdtId, Canonical, CanonicalVarKinds, DebruijnIndex, ForeignDefId, InEnvironment, Interner, + Scalar, Substitution, TraitEnvironment, TraitRefExt, Ty, TyBuilder, TyExt, TyKind, }; /// This is used as a key for indexing impls. #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] pub enum TyFingerprint { + // These are lang item impls: Str, Slice, Array, Never, RawPtr(Mutability), Scalar(Scalar), + // These can have user-defined impls: Adt(hir_def::AdtId), Dyn(TraitId), - Tuple(usize), ForeignType(ForeignDefId), - FnPtr(usize, FnSig), + // These only exist for trait impls + Unit, + Unnameable, + Function(u32), } impl TyFingerprint { - /// Creates a TyFingerprint for looking up an impl. Only certain types can - /// have impls: if we have some `struct S`, we can have an `impl S`, but not - /// `impl &S`. Hence, this will return `None` for reference types and such. - pub fn for_impl(ty: &Ty) -> Option { + /// Creates a TyFingerprint for looking up an inherent impl. Only certain + /// types can have inherent impls: if we have some `struct S`, we can have + /// an `impl S`, but not `impl &S`. Hence, this will return `None` for + /// reference types and such. + pub fn for_inherent_impl(ty: &Ty) -> Option { let fp = match ty.kind(&Interner) { TyKind::Str => TyFingerprint::Str, TyKind::Never => TyFingerprint::Never, @@ -54,17 +59,52 @@ impl TyFingerprint { TyKind::Array(..) => TyFingerprint::Array, TyKind::Scalar(scalar) => TyFingerprint::Scalar(*scalar), TyKind::Adt(AdtId(adt), _) => TyFingerprint::Adt(*adt), - TyKind::Tuple(cardinality, _) => TyFingerprint::Tuple(*cardinality), TyKind::Raw(mutability, ..) => TyFingerprint::RawPtr(*mutability), TyKind::Foreign(alias_id, ..) => TyFingerprint::ForeignType(*alias_id), - TyKind::Function(FnPointer { sig, substitution: substs, .. }) => { - TyFingerprint::FnPtr(substs.0.len(&Interner) - 1, *sig) - } TyKind::Dyn(_) => ty.dyn_trait().map(|trait_| TyFingerprint::Dyn(trait_))?, _ => return None, }; Some(fp) } + + /// Creates a TyFingerprint for looking up a trait impl. + pub fn for_trait_impl(ty: &Ty) -> Option { + let fp = match ty.kind(&Interner) { + TyKind::Str => TyFingerprint::Str, + TyKind::Never => TyFingerprint::Never, + TyKind::Slice(..) => TyFingerprint::Slice, + TyKind::Array(..) => TyFingerprint::Array, + TyKind::Scalar(scalar) => TyFingerprint::Scalar(*scalar), + TyKind::Adt(AdtId(adt), _) => TyFingerprint::Adt(*adt), + TyKind::Raw(mutability, ..) => TyFingerprint::RawPtr(*mutability), + TyKind::Foreign(alias_id, ..) => TyFingerprint::ForeignType(*alias_id), + TyKind::Dyn(_) => ty.dyn_trait().map(|trait_| TyFingerprint::Dyn(trait_))?, + TyKind::Ref(_, _, ty) => return TyFingerprint::for_trait_impl(ty), + TyKind::Tuple(_, subst) => { + let first_ty = subst.interned().get(0).map(|arg| arg.assert_ty_ref(&Interner)); + if let Some(ty) = first_ty { + return TyFingerprint::for_trait_impl(ty); + } else { + TyFingerprint::Unit + } + } + TyKind::AssociatedType(_, _) + | TyKind::OpaqueType(_, _) + | TyKind::FnDef(_, _) + | TyKind::Closure(_, _) + | TyKind::Generator(..) + | TyKind::GeneratorWitness(..) => TyFingerprint::Unnameable, + TyKind::Function(fn_ptr) => { + TyFingerprint::Function(fn_ptr.substitution.0.len(&Interner) as u32) + } + TyKind::Alias(_) + | TyKind::Placeholder(_) + | TyKind::BoundVar(_) + | TyKind::InferenceVar(_, _) + | TyKind::Error => return None, + }; + Some(fp) + } } pub(crate) const ALL_INT_FPS: [TyFingerprint; 12] = [ @@ -112,7 +152,7 @@ impl TraitImpls { None => continue, }; let self_ty = db.impl_self_ty(impl_id); - let self_ty_fp = TyFingerprint::for_impl(self_ty.skip_binders()); + let self_ty_fp = TyFingerprint::for_trait_impl(self_ty.skip_binders()); impls .map .entry(target_trait) @@ -157,10 +197,13 @@ impl TraitImpls { } /// Queries all trait impls for the given type. - pub fn for_self_ty(&self, fp: TyFingerprint) -> impl Iterator + '_ { + pub fn for_self_ty_without_blanket_impls( + &self, + fp: TyFingerprint, + ) -> impl Iterator + '_ { self.map .values() - .flat_map(move |impls| impls.get(&None).into_iter().chain(impls.get(&Some(fp)))) + .flat_map(move |impls| impls.get(&Some(fp)).into_iter()) .flat_map(|it| it.iter().copied()) } @@ -215,7 +258,9 @@ impl InherentImpls { } let self_ty = db.impl_self_ty(impl_id); - if let Some(fp) = TyFingerprint::for_impl(self_ty.skip_binders()) { + let fp = TyFingerprint::for_inherent_impl(self_ty.skip_binders()); + always!(fp.is_some()); + if let Some(fp) = fp { map.entry(fp).or_default().push(impl_id); } } @@ -228,7 +273,7 @@ impl InherentImpls { } pub fn for_self_ty(&self, self_ty: &Ty) -> &[ImplId] { - match TyFingerprint::for_impl(self_ty) { + match TyFingerprint::for_inherent_impl(self_ty) { Some(fp) => self.map.get(&fp).map(|vec| vec.as_ref()).unwrap_or(&[]), None => &[], } -- cgit v1.2.3