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Replace all the types by their Chalk versions

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This commit is contained in:
Florian Diebold 2021-04-03 17:40:56 +02:00
parent 855a739ebf
commit 77d974ae6b
3 changed files with 32 additions and 554 deletions
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35
crates/hir_ty/src/lib.rs
View file

@ -17,7 +17,6 @@ mod chalk_cast;
mod chalk_ext;
mod builder;
mod walk;
mod types;
pub mod display;
pub mod db;
@ -48,7 +47,6 @@ pub use lower::{
TyDefId, TyLoweringContext, ValueTyDefId,
};
pub use traits::{chalk::Interner, TraitEnvironment};
pub use types::*;
pub use walk::TypeWalk;
pub use chalk_ir::{
@ -65,6 +63,21 @@ pub type PlaceholderIndex = chalk_ir::PlaceholderIndex;
pub type VariableKind = chalk_ir::VariableKind<Interner>;
pub type VariableKinds = chalk_ir::VariableKinds<Interner>;
pub type CanonicalVarKinds = chalk_ir::CanonicalVarKinds<Interner>;
pub type Binders<T> = chalk_ir::Binders<T>;
pub type Substitution = chalk_ir::Substitution<Interner>;
pub type GenericArg = chalk_ir::GenericArg<Interner>;
pub type GenericArgData = chalk_ir::GenericArgData<Interner>;
pub type Ty = chalk_ir::Ty<Interner>;
pub type TyKind = chalk_ir::TyKind<Interner>;
pub type DynTy = chalk_ir::DynTy<Interner>;
pub type FnPointer = chalk_ir::FnPointer<Interner>;
// pub type FnSubst = chalk_ir::FnSubst<Interner>;
pub use chalk_ir::FnSubst;
pub type ProjectionTy = chalk_ir::ProjectionTy<Interner>;
pub type AliasTy = chalk_ir::AliasTy<Interner>;
pub type OpaqueTy = chalk_ir::OpaqueTy<Interner>;
pub type InferenceVar = chalk_ir::InferenceVar;
pub type Lifetime = chalk_ir::Lifetime<Interner>;
pub type LifetimeData = chalk_ir::LifetimeData<Interner>;
@ -79,6 +92,14 @@ pub type ChalkTraitId = chalk_ir::TraitId<Interner>;
pub type FnSig = chalk_ir::FnSig<Interner>;
pub type InEnvironment<T> = chalk_ir::InEnvironment<T>;
pub type DomainGoal = chalk_ir::DomainGoal<Interner>;
pub type AliasEq = chalk_ir::AliasEq<Interner>;
pub type Solution = chalk_solve::Solution<Interner>;
pub type ConstrainedSubst = chalk_ir::ConstrainedSubst<Interner>;
pub type Guidance = chalk_solve::Guidance<Interner>;
pub type WhereClause = chalk_ir::WhereClause<Interner>;
// FIXME: get rid of this
pub fn subst_prefix(s: &Substitution, n: usize) -> Substitution {
Substitution::intern(s.interned()[..std::cmp::min(s.len(&Interner), n)].into())
@ -121,6 +142,14 @@ pub fn make_canonical<T>(
Canonical { value, binders: chalk_ir::CanonicalVarKinds::from_iter(&Interner, kinds) }
}
pub type TraitRef = chalk_ir::TraitRef<Interner>;
pub type QuantifiedWhereClause = Binders<WhereClause>;
pub type QuantifiedWhereClauses = chalk_ir::QuantifiedWhereClauses<Interner>;
pub type Canonical<T> = chalk_ir::Canonical<T>;
/// A function signature as seen by type inference: Several parameter types and
/// one return type.
#[derive(Clone, PartialEq, Eq, Debug)]
@ -164,8 +193,6 @@ impl CallableSig {
}
}
impl Ty {}
#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
pub enum ImplTraitId {
ReturnTypeImplTrait(hir_def::FunctionId, u16),

549
crates/hir_ty/src/types.rs
View file

@ -1,549 +0,0 @@
//! This is the home of `Ty` etc. until they get replaced by their chalk_ir
//! equivalents.
use std::sync::Arc;
use chalk_ir::{
cast::{Cast, CastTo, Caster},
BoundVar, Mutability, Scalar, TyVariableKind,
};
use smallvec::SmallVec;
use crate::{
AssocTypeId, CanonicalVarKinds, ChalkTraitId, ClosureId, Const, FnDefId, FnSig, ForeignDefId,
Interner, Lifetime, OpaqueTyId, PlaceholderIndex, TypeWalk, VariableKind, VariableKinds,
};
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct OpaqueTy {
pub opaque_ty_id: OpaqueTyId,
pub substitution: Substitution,
}
/// A "projection" type corresponds to an (unnormalized)
/// projection like `<P0 as Trait<P1..Pn>>::Foo`. Note that the
/// trait and all its parameters are fully known.
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct ProjectionTy {
pub associated_ty_id: AssocTypeId,
pub substitution: Substitution,
}
impl ProjectionTy {
pub fn self_type_parameter(&self, interner: &Interner) -> Ty {
self.substitution.interned()[0].assert_ty_ref(interner).clone()
}
}
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct DynTy {
/// The unknown self type.
pub bounds: Binders<QuantifiedWhereClauses>,
pub lifetime: Lifetime,
}
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct FnPointer {
pub num_binders: usize,
pub sig: FnSig,
pub substitution: FnSubst,
}
/// A wrapper for the substs on a Fn.
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct FnSubst(pub Substitution);
impl FnPointer {
/// Represent the current `Fn` as if it was wrapped in `Binders`
pub fn into_binders(self, interner: &Interner) -> Binders<FnSubst> {
Binders::new(
VariableKinds::from_iter(
interner,
(0..self.num_binders).map(|_| VariableKind::Lifetime),
),
self.substitution,
)
}
/// Represent the current `Fn` as if it was wrapped in `Binders`
pub fn as_binders(&self, interner: &Interner) -> Binders<&FnSubst> {
Binders::new(
VariableKinds::from_iter(
interner,
(0..self.num_binders).map(|_| VariableKind::Lifetime),
),
&self.substitution,
)
}
}
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub enum AliasTy {
/// A "projection" type corresponds to an (unnormalized)
/// projection like `<P0 as Trait<P1..Pn>>::Foo`. Note that the
/// trait and all its parameters are fully known.
Projection(ProjectionTy),
/// An opaque type (`impl Trait`).
///
/// This is currently only used for return type impl trait; each instance of
/// `impl Trait` in a return type gets its own ID.
Opaque(OpaqueTy),
}
/// A type.
///
/// See also the `TyKind` enum in rustc (librustc/ty/sty.rs), which represents
/// the same thing (but in a different way).
///
/// This should be cheap to clone.
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub enum TyKind {
/// Structures, enumerations and unions.
Adt(chalk_ir::AdtId<Interner>, Substitution),
/// Represents an associated item like `Iterator::Item`. This is used
/// when we have tried to normalize a projection like `T::Item` but
/// couldn't find a better representation. In that case, we generate
/// an **application type** like `(Iterator::Item)<T>`.
AssociatedType(AssocTypeId, Substitution),
/// a scalar type like `bool` or `u32`
Scalar(Scalar),
/// A tuple type. For example, `(i32, bool)`.
Tuple(usize, Substitution),
/// An array with the given length. Written as `[T; n]`.
Array(Ty, Const),
/// The pointee of an array slice. Written as `[T]`.
Slice(Ty),
/// A raw pointer. Written as `*mut T` or `*const T`
Raw(Mutability, Ty),
/// A reference; a pointer with an associated lifetime. Written as
/// `&'a mut T` or `&'a T`.
Ref(Mutability, Lifetime, Ty),
/// This represents a placeholder for an opaque type in situations where we
/// don't know the hidden type (i.e. currently almost always). This is
/// analogous to the `AssociatedType` type constructor.
/// It is also used as the type of async block, with one type parameter
/// representing the Future::Output type.
OpaqueType(OpaqueTyId, Substitution),
/// The anonymous type of a function declaration/definition. Each
/// function has a unique type, which is output (for a function
/// named `foo` returning an `i32`) as `fn() -> i32 {foo}`.
///
/// This includes tuple struct / enum variant constructors as well.
///
/// For example the type of `bar` here:
///
/// ```
/// fn foo() -> i32 { 1 }
/// let bar = foo; // bar: fn() -> i32 {foo}
/// ```
FnDef(FnDefId, Substitution),
/// The pointee of a string slice. Written as `str`.
Str,
/// The never type `!`.
Never,
/// The type of a specific closure.
///
/// The closure signature is stored in a `FnPtr` type in the first type
/// parameter.
Closure(ClosureId, Substitution),
/// Represents a foreign type declared in external blocks.
Foreign(ForeignDefId),
/// A pointer to a function. Written as `fn() -> i32`.
///
/// For example the type of `bar` here:
///
/// ```
/// fn foo() -> i32 { 1 }
/// let bar: fn() -> i32 = foo;
/// ```
Function(FnPointer),
/// An "alias" type represents some form of type alias, such as:
/// - An associated type projection like `<T as Iterator>::Item`
/// - `impl Trait` types
/// - Named type aliases like `type Foo<X> = Vec<X>`
Alias(AliasTy),
/// A placeholder for a type parameter; for example, `T` in `fn f<T>(x: T)
/// {}` when we're type-checking the body of that function. In this
/// situation, we know this stands for *some* type, but don't know the exact
/// type.
Placeholder(PlaceholderIndex),
/// A bound type variable. This is used in various places: when representing
/// some polymorphic type like the type of function `fn f<T>`, the type
/// parameters get turned into variables; during trait resolution, inference
/// variables get turned into bound variables and back; and in `Dyn` the
/// `Self` type is represented with a bound variable as well.
BoundVar(BoundVar),
/// A type variable used during type checking.
InferenceVar(InferenceVar, TyVariableKind),
/// A trait object (`dyn Trait` or bare `Trait` in pre-2018 Rust).
///
/// The predicates are quantified over the `Self` type, i.e. `Ty::Bound(0)`
/// represents the `Self` type inside the bounds. This is currently
/// implicit; Chalk has the `Binders` struct to make it explicit, but it
/// didn't seem worth the overhead yet.
Dyn(DynTy),
/// A placeholder for a type which could not be computed; this is propagated
/// to avoid useless error messages. Doubles as a placeholder where type
/// variables are inserted before type checking, since we want to try to
/// infer a better type here anyway -- for the IDE use case, we want to try
/// to infer as much as possible even in the presence of type errors.
Error,
}
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct Ty(Arc<TyKind>);
impl TyKind {
pub fn intern(self, _interner: &Interner) -> Ty {
Ty(Arc::new(self))
}
}
impl Ty {
pub fn kind(&self, _interner: &Interner) -> &TyKind {
&self.0
}
pub fn interned_mut(&mut self) -> &mut TyKind {
Arc::make_mut(&mut self.0)
}
pub fn into_inner(self) -> TyKind {
Arc::try_unwrap(self.0).unwrap_or_else(|a| (*a).clone())
}
}
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct GenericArg {
interned: GenericArgData,
}
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub enum GenericArgData {
Ty(Ty),
}
impl GenericArg {
/// Constructs a generic argument using `GenericArgData`.
pub fn new(_interner: &Interner, data: GenericArgData) -> Self {
GenericArg { interned: data }
}
/// Gets the interned value.
pub fn interned(&self) -> &GenericArgData {
&self.interned
}
/// Asserts that this is a type argument.
pub fn assert_ty_ref(&self, interner: &Interner) -> &Ty {
self.ty(interner).unwrap()
}
/// Checks whether the generic argument is a type.
pub fn is_ty(&self, _interner: &Interner) -> bool {
match self.interned() {
GenericArgData::Ty(_) => true,
}
}
/// Returns the type if it is one, `None` otherwise.
pub fn ty(&self, _interner: &Interner) -> Option<&Ty> {
match self.interned() {
GenericArgData::Ty(t) => Some(t),
}
}
pub fn interned_mut(&mut self) -> &mut GenericArgData {
&mut self.interned
}
}
/// A list of substitutions for generic parameters.
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct Substitution(SmallVec<[GenericArg; 2]>);
impl Substitution {
pub fn interned(&self) -> &SmallVec<[GenericArg; 2]> {
&self.0
}
pub fn len(&self, _: &Interner) -> usize {
self.0.len()
}
pub fn is_empty(&self, _: &Interner) -> bool {
self.0.is_empty()
}
pub fn at(&self, _: &Interner, i: usize) -> &GenericArg {
&self.0[i]
}
pub fn empty(_: &Interner) -> Substitution {
Substitution(SmallVec::new())
}
pub fn iter(&self, _: &Interner) -> std::slice::Iter<'_, GenericArg> {
self.0.iter()
}
pub fn from1(_interner: &Interner, ty: Ty) -> Substitution {
Substitution::intern({
let mut v = SmallVec::new();
v.push(ty.cast(&Interner));
v
})
}
pub fn from_iter(
interner: &Interner,
elements: impl IntoIterator<Item = impl CastTo<GenericArg>>,
) -> Self {
Substitution(elements.into_iter().casted(interner).collect())
}
pub fn apply<T: TypeWalk>(&self, value: T, _interner: &Interner) -> T {
value.subst_bound_vars(self)
}
// Temporary helper functions, to be removed
pub fn intern(interned: SmallVec<[GenericArg; 2]>) -> Substitution {
Substitution(interned)
}
pub fn interned_mut(&mut self) -> &mut SmallVec<[GenericArg; 2]> {
&mut self.0
}
}
#[derive(Clone, PartialEq, Eq, Hash)]
pub struct Binders<T> {
/// The binders that quantify over the value.
pub binders: VariableKinds,
value: T,
}
impl<T> Binders<T> {
pub fn new(binders: VariableKinds, value: T) -> Self {
Self { binders, value }
}
pub fn empty(_interner: &Interner, value: T) -> Self {
crate::make_only_type_binders(0, value)
}
pub fn as_ref(&self) -> Binders<&T> {
Binders { binders: self.binders.clone(), value: &self.value }
}
pub fn map<U>(self, f: impl FnOnce(T) -> U) -> Binders<U> {
Binders { binders: self.binders, value: f(self.value) }
}
pub fn filter_map<U>(self, f: impl FnOnce(T) -> Option<U>) -> Option<Binders<U>> {
Some(Binders { binders: self.binders, value: f(self.value)? })
}
pub fn skip_binders(&self) -> &T {
&self.value
}
pub fn into_value_and_skipped_binders(self) -> (T, VariableKinds) {
(self.value, self.binders)
}
/// Returns the number of binders.
pub fn len(&self, interner: &Interner) -> usize {
self.binders.len(interner)
}
// Temporary helper function, to be removed
pub fn skip_binders_mut(&mut self) -> &mut T {
&mut self.value
}
}
impl<T: Clone> Binders<&T> {
pub fn cloned(&self) -> Binders<T> {
Binders::new(self.binders.clone(), self.value.clone())
}
}
impl<T: TypeWalk> Binders<T> {
/// Substitutes all variables.
pub fn substitute(self, interner: &Interner, subst: &Substitution) -> T {
let (value, binders) = self.into_value_and_skipped_binders();
assert_eq!(subst.len(interner), binders.len(interner));
value.subst_bound_vars(subst)
}
}
impl<T: std::fmt::Debug> std::fmt::Debug for Binders<T> {
fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
let Binders { ref binders, ref value } = *self;
write!(fmt, "for{:?} ", binders.inner_debug(&Interner))?;
std::fmt::Debug::fmt(value, fmt)
}
}
/// A trait with type parameters. This includes the `Self`, so this represents a concrete type implementing the trait.
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct TraitRef {
pub trait_id: ChalkTraitId,
pub substitution: Substitution,
}
impl TraitRef {
pub fn self_type_parameter(&self, interner: &Interner) -> Ty {
self.substitution.at(interner, 0).assert_ty_ref(interner).clone()
}
}
/// Like `generics::WherePredicate`, but with resolved types: A condition on the
/// parameters of a generic item.
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum WhereClause {
/// The given trait needs to be implemented for its type parameters.
Implemented(TraitRef),
/// An associated type bindings like in `Iterator<Item = T>`.
AliasEq(AliasEq),
}
pub type QuantifiedWhereClause = Binders<WhereClause>;
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct QuantifiedWhereClauses(Arc<[QuantifiedWhereClause]>);
impl QuantifiedWhereClauses {
pub fn from_iter(
_interner: &Interner,
elements: impl IntoIterator<Item = QuantifiedWhereClause>,
) -> Self {
QuantifiedWhereClauses(elements.into_iter().collect())
}
pub fn interned(&self) -> &Arc<[QuantifiedWhereClause]> {
&self.0
}
pub fn interned_mut(&mut self) -> &mut Arc<[QuantifiedWhereClause]> {
&mut self.0
}
}
/// Basically a claim (currently not validated / checked) that the contained
/// type / trait ref contains no inference variables; any inference variables it
/// contained have been replaced by bound variables, and `kinds` tells us how
/// many there are and whether they were normal or float/int variables. This is
/// used to erase irrelevant differences between types before using them in
/// queries.
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Canonical<T> {
pub value: T,
pub binders: CanonicalVarKinds,
}
/// Something (usually a goal), along with an environment.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct InEnvironment<T> {
pub environment: chalk_ir::Environment<Interner>,
pub goal: T,
}
impl<T> InEnvironment<T> {
pub fn new(environment: &chalk_ir::Environment<Interner>, value: T) -> InEnvironment<T> {
InEnvironment { environment: environment.clone(), goal: value }
}
}
/// Something that needs to be proven (by Chalk) during type checking, e.g. that
/// a certain type implements a certain trait. Proving the Obligation might
/// result in additional information about inference variables.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum DomainGoal {
Holds(WhereClause),
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct AliasEq {
pub alias: AliasTy,
pub ty: Ty,
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ConstrainedSubst {
pub subst: Substitution,
}
#[derive(Clone, Debug, PartialEq, Eq)]
/// A (possible) solution for a proposed goal.
pub enum Solution {
/// The goal indeed holds, and there is a unique value for all existential
/// variables.
Unique(Canonical<ConstrainedSubst>),
/// The goal may be provable in multiple ways, but regardless we may have some guidance
/// for type inference. In this case, we don't return any lifetime
/// constraints, since we have not "committed" to any particular solution
/// yet.
Ambig(Guidance),
}
#[derive(Clone, Debug, PartialEq, Eq)]
/// When a goal holds ambiguously (e.g., because there are multiple possible
/// solutions), we issue a set of *guidance* back to type inference.
pub enum Guidance {
/// The existential variables *must* have the given values if the goal is
/// ever to hold, but that alone isn't enough to guarantee the goal will
/// actually hold.
Definite(Canonical<Substitution>),
/// There are multiple plausible values for the existentials, but the ones
/// here are suggested as the preferred choice heuristically. These should
/// be used for inference fallback only.
Suggested(Canonical<Substitution>),
/// There's no useful information to feed back to type inference
Unknown,
}
/// The kinds of placeholders we need during type inference. There's separate
/// values for general types, and for integer and float variables. The latter
/// two are used for inference of literal values (e.g. `100` could be one of
/// several integer types).
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub struct InferenceVar {
index: u32,
}
impl From<u32> for InferenceVar {
fn from(index: u32) -> InferenceVar {
InferenceVar { index }
}
}
impl InferenceVar {
/// Gets the underlying index value.
pub fn index(self) -> u32 {
self.index
}
}

2
crates/hir_ty/src/walk.rs
View file

@ -408,7 +408,7 @@ impl TypeWalk for AliasEq {
}
}
impl TypeWalk for FnSubst {
impl TypeWalk for FnSubst<Interner> {
fn walk(&self, f: &mut impl FnMut(&Ty)) {
self.0.walk(f)
}