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|
//! The type system. We currently use this to infer types for completion, hover
//! information and various assists.
#[allow(unused)]
macro_rules! eprintln {
($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
}
mod autoderef;
mod builder;
mod chalk_db;
mod chalk_ext;
mod infer;
mod interner;
mod lower;
mod mapping;
mod op;
mod tls;
mod utils;
mod walk;
pub mod db;
pub mod diagnostics;
pub mod display;
pub mod method_resolution;
pub mod primitive;
pub mod traits;
#[cfg(test)]
mod tests;
#[cfg(test)]
mod test_db;
use std::sync::Arc;
use chalk_ir::{
fold::{Fold, Shift},
interner::HasInterner,
UintTy,
};
use hir_def::{expr::ExprId, type_ref::Rawness, TypeParamId};
use crate::{db::HirDatabase, display::HirDisplay, utils::generics};
pub use autoderef::autoderef;
pub use builder::TyBuilder;
pub use chalk_ext::*;
pub use infer::{could_unify, InferenceResult};
pub use interner::Interner;
pub use lower::{
associated_type_shorthand_candidates, callable_item_sig, CallableDefId, ImplTraitLoweringMode,
TyDefId, TyLoweringContext, ValueTyDefId,
};
pub use mapping::{
const_from_placeholder_idx, from_assoc_type_id, from_chalk_trait_id, from_foreign_def_id,
from_placeholder_idx, lt_from_placeholder_idx, to_assoc_type_id, to_chalk_trait_id,
to_foreign_def_id, to_placeholder_idx,
};
pub use traits::TraitEnvironment;
pub use utils::all_super_traits;
pub use walk::TypeWalk;
pub use chalk_ir::{
cast::Cast, AdtId, BoundVar, DebruijnIndex, Mutability, Safety, Scalar, TyVariableKind,
};
pub type ForeignDefId = chalk_ir::ForeignDefId<Interner>;
pub type AssocTypeId = chalk_ir::AssocTypeId<Interner>;
pub type FnDefId = chalk_ir::FnDefId<Interner>;
pub type ClosureId = chalk_ir::ClosureId<Interner>;
pub type OpaqueTyId = chalk_ir::OpaqueTyId<Interner>;
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>;
pub type LifetimeOutlives = chalk_ir::LifetimeOutlives<Interner>;
pub type Const = chalk_ir::Const<Interner>;
pub type ConstData = chalk_ir::ConstData<Interner>;
pub type ConstValue = chalk_ir::ConstValue<Interner>;
pub type ConcreteConst = chalk_ir::ConcreteConst<Interner>;
pub type ChalkTraitId = chalk_ir::TraitId<Interner>;
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>;
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::from_iter(
&Interner,
s.as_slice(&Interner)[..std::cmp::min(s.len(&Interner), n)].iter().cloned(),
)
}
/// Return an index of a parameter in the generic type parameter list by it's id.
pub fn param_idx(db: &dyn HirDatabase, id: TypeParamId) -> Option<usize> {
generics(db.upcast(), id.parent).param_idx(id)
}
pub(crate) fn wrap_empty_binders<T>(value: T) -> Binders<T>
where
T: Fold<Interner, Result = T> + HasInterner<Interner = Interner>,
{
Binders::empty(&Interner, value.shifted_in_from(&Interner, DebruijnIndex::ONE))
}
pub(crate) fn make_only_type_binders<T: HasInterner<Interner = Interner>>(
num_vars: usize,
value: T,
) -> Binders<T> {
Binders::new(
VariableKinds::from_iter(
&Interner,
std::iter::repeat(chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General))
.take(num_vars),
),
value,
)
}
// FIXME: get rid of this
pub fn make_canonical<T: HasInterner<Interner = Interner>>(
value: T,
kinds: impl IntoIterator<Item = TyVariableKind>,
) -> Canonical<T> {
let kinds = kinds.into_iter().map(|tk| {
chalk_ir::CanonicalVarKind::new(
chalk_ir::VariableKind::Ty(tk),
chalk_ir::UniverseIndex::ROOT,
)
});
Canonical { value, binders: chalk_ir::CanonicalVarKinds::from_iter(&Interner, kinds) }
}
/// A function signature as seen by type inference: Several parameter types and
/// one return type.
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct CallableSig {
params_and_return: Arc<[Ty]>,
is_varargs: bool,
}
has_interner!(CallableSig);
/// A polymorphic function signature.
pub type PolyFnSig = Binders<CallableSig>;
impl CallableSig {
pub fn from_params_and_return(mut params: Vec<Ty>, ret: Ty, is_varargs: bool) -> CallableSig {
params.push(ret);
CallableSig { params_and_return: params.into(), is_varargs }
}
pub fn from_fn_ptr(fn_ptr: &FnPointer) -> CallableSig {
CallableSig {
// FIXME: what to do about lifetime params? -> return PolyFnSig
params_and_return: fn_ptr
.substitution
.clone()
.shifted_out_to(&Interner, DebruijnIndex::ONE)
.expect("unexpected lifetime vars in fn ptr")
.0
.as_slice(&Interner)
.iter()
.map(|arg| arg.assert_ty_ref(&Interner).clone())
.collect(),
is_varargs: fn_ptr.sig.variadic,
}
}
pub fn params(&self) -> &[Ty] {
&self.params_and_return[0..self.params_and_return.len() - 1]
}
pub fn ret(&self) -> &Ty {
&self.params_and_return[self.params_and_return.len() - 1]
}
}
impl Fold<Interner> for CallableSig {
type Result = CallableSig;
fn fold_with<'i>(
self,
folder: &mut dyn chalk_ir::fold::Folder<'i, Interner>,
outer_binder: DebruijnIndex,
) -> chalk_ir::Fallible<Self::Result>
where
Interner: 'i,
{
let vec = self.params_and_return.to_vec();
let folded = vec.fold_with(folder, outer_binder)?;
Ok(CallableSig { params_and_return: folded.into(), is_varargs: self.is_varargs })
}
}
#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
pub enum ImplTraitId {
ReturnTypeImplTrait(hir_def::FunctionId, u16),
AsyncBlockTypeImplTrait(hir_def::DefWithBodyId, ExprId),
}
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub struct ReturnTypeImplTraits {
pub(crate) impl_traits: Vec<ReturnTypeImplTrait>,
}
has_interner!(ReturnTypeImplTraits);
#[derive(Clone, PartialEq, Eq, Debug, Hash)]
pub(crate) struct ReturnTypeImplTrait {
pub(crate) bounds: Binders<Vec<QuantifiedWhereClause>>,
}
pub fn static_lifetime() -> Lifetime {
LifetimeData::Static.intern(&Interner)
}
pub fn dummy_usize_const() -> Const {
let usize_ty = chalk_ir::TyKind::Scalar(Scalar::Uint(UintTy::Usize)).intern(&Interner);
chalk_ir::ConstData {
ty: usize_ty,
value: chalk_ir::ConstValue::Concrete(chalk_ir::ConcreteConst { interned: () }),
}
.intern(&Interner)
}
pub(crate) fn fold_free_vars<T: HasInterner<Interner = Interner> + Fold<Interner>>(
t: T,
f: impl FnMut(BoundVar, DebruijnIndex) -> Ty,
) -> T::Result {
use chalk_ir::{fold::Folder, Fallible};
struct FreeVarFolder<F>(F);
impl<'i, F: FnMut(BoundVar, DebruijnIndex) -> Ty + 'i> Folder<'i, Interner> for FreeVarFolder<F> {
fn as_dyn(&mut self) -> &mut dyn Folder<'i, Interner> {
self
}
fn interner(&self) -> &'i Interner {
&Interner
}
fn fold_free_var_ty(
&mut self,
bound_var: BoundVar,
outer_binder: DebruijnIndex,
) -> Fallible<Ty> {
Ok(self.0(bound_var, outer_binder))
}
}
t.fold_with(&mut FreeVarFolder(f), DebruijnIndex::INNERMOST).expect("fold failed unexpectedly")
}
pub(crate) fn fold_tys<T: HasInterner<Interner = Interner> + Fold<Interner>>(
t: T,
f: impl FnMut(Ty, DebruijnIndex) -> Ty,
binders: DebruijnIndex,
) -> T::Result {
use chalk_ir::{
fold::{Folder, SuperFold},
Fallible,
};
struct TyFolder<F>(F);
impl<'i, F: FnMut(Ty, DebruijnIndex) -> Ty + 'i> Folder<'i, Interner> for TyFolder<F> {
fn as_dyn(&mut self) -> &mut dyn Folder<'i, Interner> {
self
}
fn interner(&self) -> &'i Interner {
&Interner
}
fn fold_ty(&mut self, ty: Ty, outer_binder: DebruijnIndex) -> Fallible<Ty> {
let ty = ty.super_fold_with(self.as_dyn(), outer_binder)?;
Ok(self.0(ty, outer_binder))
}
}
t.fold_with(&mut TyFolder(f), binders).expect("fold failed unexpectedly")
}
|