773 lines
31 KiB
Rust
773 lines
31 KiB
Rust
//! The implementation of `RustIrDatabase` for Chalk, which provides information
|
||
//! about the code that Chalk needs.
|
||
use std::sync::Arc;
|
||
|
||
use cov_mark::hit;
|
||
use tracing::debug;
|
||
|
||
use chalk_ir::{cast::Cast, fold::shift::Shift, CanonicalVarKinds};
|
||
use chalk_solve::rust_ir::{self, OpaqueTyDatumBound, WellKnownTrait};
|
||
|
||
use base_db::CrateId;
|
||
use hir_def::{
|
||
lang_item::{lang_attr, LangItemTarget},
|
||
AssocItemId, GenericDefId, HasModule, ItemContainerId, Lookup, ModuleId, TypeAliasId,
|
||
};
|
||
use hir_expand::name::name;
|
||
|
||
use crate::{
|
||
db::HirDatabase,
|
||
display::HirDisplay,
|
||
from_assoc_type_id, from_chalk_trait_id, from_foreign_def_id, make_only_type_binders,
|
||
mapping::{from_chalk, ToChalk, TypeAliasAsValue},
|
||
method_resolution::{TraitImpls, TyFingerprint, ALL_FLOAT_FPS, ALL_INT_FPS},
|
||
to_assoc_type_id, to_chalk_trait_id,
|
||
traits::ChalkContext,
|
||
utils::generics,
|
||
AliasEq, AliasTy, BoundVar, CallableDefId, DebruijnIndex, FnDefId, Interner, ProjectionTy,
|
||
ProjectionTyExt, QuantifiedWhereClause, Substitution, TraitRef, TraitRefExt, Ty, TyBuilder,
|
||
TyExt, TyKind, WhereClause,
|
||
};
|
||
|
||
pub(crate) type AssociatedTyDatum = chalk_solve::rust_ir::AssociatedTyDatum<Interner>;
|
||
pub(crate) type TraitDatum = chalk_solve::rust_ir::TraitDatum<Interner>;
|
||
pub(crate) type StructDatum = chalk_solve::rust_ir::AdtDatum<Interner>;
|
||
pub(crate) type ImplDatum = chalk_solve::rust_ir::ImplDatum<Interner>;
|
||
pub(crate) type OpaqueTyDatum = chalk_solve::rust_ir::OpaqueTyDatum<Interner>;
|
||
|
||
pub(crate) type AssocTypeId = chalk_ir::AssocTypeId<Interner>;
|
||
pub(crate) type TraitId = chalk_ir::TraitId<Interner>;
|
||
pub(crate) type AdtId = chalk_ir::AdtId<Interner>;
|
||
pub(crate) type ImplId = chalk_ir::ImplId<Interner>;
|
||
pub(crate) type AssociatedTyValueId = chalk_solve::rust_ir::AssociatedTyValueId<Interner>;
|
||
pub(crate) type AssociatedTyValue = chalk_solve::rust_ir::AssociatedTyValue<Interner>;
|
||
pub(crate) type FnDefDatum = chalk_solve::rust_ir::FnDefDatum<Interner>;
|
||
pub(crate) type Variances = chalk_ir::Variances<Interner>;
|
||
|
||
impl<'a> chalk_solve::RustIrDatabase<Interner> for ChalkContext<'a> {
|
||
fn associated_ty_data(&self, id: AssocTypeId) -> Arc<AssociatedTyDatum> {
|
||
self.db.associated_ty_data(id)
|
||
}
|
||
fn trait_datum(&self, trait_id: TraitId) -> Arc<TraitDatum> {
|
||
self.db.trait_datum(self.krate, trait_id)
|
||
}
|
||
fn adt_datum(&self, struct_id: AdtId) -> Arc<StructDatum> {
|
||
self.db.struct_datum(self.krate, struct_id)
|
||
}
|
||
fn adt_repr(&self, _struct_id: AdtId) -> Arc<rust_ir::AdtRepr<Interner>> {
|
||
// FIXME: keep track of these
|
||
Arc::new(rust_ir::AdtRepr { c: false, packed: false, int: None })
|
||
}
|
||
fn discriminant_type(&self, _ty: chalk_ir::Ty<Interner>) -> chalk_ir::Ty<Interner> {
|
||
// FIXME: keep track of this
|
||
chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Uint(chalk_ir::UintTy::U32)).intern(&Interner)
|
||
}
|
||
fn impl_datum(&self, impl_id: ImplId) -> Arc<ImplDatum> {
|
||
self.db.impl_datum(self.krate, impl_id)
|
||
}
|
||
|
||
fn fn_def_datum(
|
||
&self,
|
||
fn_def_id: chalk_ir::FnDefId<Interner>,
|
||
) -> Arc<rust_ir::FnDefDatum<Interner>> {
|
||
self.db.fn_def_datum(self.krate, fn_def_id)
|
||
}
|
||
|
||
fn impls_for_trait(
|
||
&self,
|
||
trait_id: TraitId,
|
||
parameters: &[chalk_ir::GenericArg<Interner>],
|
||
binders: &CanonicalVarKinds<Interner>,
|
||
) -> Vec<ImplId> {
|
||
debug!("impls_for_trait {:?}", trait_id);
|
||
let trait_: hir_def::TraitId = from_chalk_trait_id(trait_id);
|
||
|
||
let ty: Ty = parameters[0].assert_ty_ref(&Interner).clone();
|
||
|
||
fn binder_kind(
|
||
ty: &Ty,
|
||
binders: &CanonicalVarKinds<Interner>,
|
||
) -> Option<chalk_ir::TyVariableKind> {
|
||
if let TyKind::BoundVar(bv) = ty.kind(&Interner) {
|
||
let binders = binders.as_slice(&Interner);
|
||
if bv.debruijn == DebruijnIndex::INNERMOST {
|
||
if let chalk_ir::VariableKind::Ty(tk) = binders[bv.index].kind {
|
||
return Some(tk);
|
||
}
|
||
}
|
||
}
|
||
None
|
||
}
|
||
|
||
let self_ty_fp = TyFingerprint::for_trait_impl(&ty);
|
||
let fps: &[TyFingerprint] = match binder_kind(&ty, binders) {
|
||
Some(chalk_ir::TyVariableKind::Integer) => &ALL_INT_FPS,
|
||
Some(chalk_ir::TyVariableKind::Float) => &ALL_FLOAT_FPS,
|
||
_ => self_ty_fp.as_ref().map(std::slice::from_ref).unwrap_or(&[]),
|
||
};
|
||
|
||
fn local_impls(db: &dyn HirDatabase, module: ModuleId) -> Option<Arc<TraitImpls>> {
|
||
let block = module.containing_block()?;
|
||
hit!(block_local_impls);
|
||
db.trait_impls_in_block(block)
|
||
}
|
||
|
||
// Note: Since we're using impls_for_trait, only impls where the trait
|
||
// can be resolved should ever reach Chalk. impl_datum relies on that
|
||
// and will panic if the trait can't be resolved.
|
||
let in_deps = self.db.trait_impls_in_deps(self.krate);
|
||
let in_self = self.db.trait_impls_in_crate(self.krate);
|
||
let trait_module = trait_.module(self.db.upcast());
|
||
let type_module = match self_ty_fp {
|
||
Some(TyFingerprint::Adt(adt_id)) => Some(adt_id.module(self.db.upcast())),
|
||
Some(TyFingerprint::ForeignType(type_id)) => {
|
||
Some(from_foreign_def_id(type_id).module(self.db.upcast()))
|
||
}
|
||
Some(TyFingerprint::Dyn(trait_id)) => Some(trait_id.module(self.db.upcast())),
|
||
_ => None,
|
||
};
|
||
let impl_maps = [
|
||
Some(in_deps),
|
||
Some(in_self),
|
||
local_impls(self.db, trait_module),
|
||
type_module.and_then(|m| local_impls(self.db, m)),
|
||
];
|
||
|
||
let id_to_chalk = |id: hir_def::ImplId| id.to_chalk(self.db);
|
||
|
||
let result: Vec<_> = if fps.is_empty() {
|
||
debug!("Unrestricted search for {:?} impls...", trait_);
|
||
impl_maps
|
||
.iter()
|
||
.filter_map(|o| o.as_ref())
|
||
.flat_map(|impls| impls.for_trait(trait_).map(id_to_chalk))
|
||
.collect()
|
||
} else {
|
||
impl_maps
|
||
.iter()
|
||
.filter_map(|o| o.as_ref())
|
||
.flat_map(|impls| {
|
||
fps.iter().flat_map(move |fp| {
|
||
impls.for_trait_and_self_ty(trait_, *fp).map(id_to_chalk)
|
||
})
|
||
})
|
||
.collect()
|
||
};
|
||
|
||
debug!("impls_for_trait returned {} impls", result.len());
|
||
result
|
||
}
|
||
fn impl_provided_for(&self, auto_trait_id: TraitId, kind: &chalk_ir::TyKind<Interner>) -> bool {
|
||
debug!("impl_provided_for {:?}, {:?}", auto_trait_id, kind);
|
||
false // FIXME
|
||
}
|
||
fn associated_ty_value(&self, id: AssociatedTyValueId) -> Arc<AssociatedTyValue> {
|
||
self.db.associated_ty_value(self.krate, id)
|
||
}
|
||
|
||
fn custom_clauses(&self) -> Vec<chalk_ir::ProgramClause<Interner>> {
|
||
vec![]
|
||
}
|
||
fn local_impls_to_coherence_check(&self, _trait_id: TraitId) -> Vec<ImplId> {
|
||
// We don't do coherence checking (yet)
|
||
unimplemented!()
|
||
}
|
||
fn interner(&self) -> &Interner {
|
||
&Interner
|
||
}
|
||
fn well_known_trait_id(
|
||
&self,
|
||
well_known_trait: rust_ir::WellKnownTrait,
|
||
) -> Option<chalk_ir::TraitId<Interner>> {
|
||
let lang_attr = lang_attr_from_well_known_trait(well_known_trait);
|
||
let trait_ = match self.db.lang_item(self.krate, lang_attr.into()) {
|
||
Some(LangItemTarget::TraitId(trait_)) => trait_,
|
||
_ => return None,
|
||
};
|
||
Some(to_chalk_trait_id(trait_))
|
||
}
|
||
|
||
fn program_clauses_for_env(
|
||
&self,
|
||
environment: &chalk_ir::Environment<Interner>,
|
||
) -> chalk_ir::ProgramClauses<Interner> {
|
||
self.db.program_clauses_for_chalk_env(self.krate, environment.clone())
|
||
}
|
||
|
||
fn opaque_ty_data(&self, id: chalk_ir::OpaqueTyId<Interner>) -> Arc<OpaqueTyDatum> {
|
||
let full_id = self.db.lookup_intern_impl_trait_id(id.into());
|
||
let bound = match full_id {
|
||
crate::ImplTraitId::ReturnTypeImplTrait(func, idx) => {
|
||
let datas = self
|
||
.db
|
||
.return_type_impl_traits(func)
|
||
.expect("impl trait id without impl traits");
|
||
let (datas, binders) = (*datas).as_ref().into_value_and_skipped_binders();
|
||
let data = &datas.impl_traits[idx as usize];
|
||
let bound = OpaqueTyDatumBound {
|
||
bounds: make_only_type_binders(1, data.bounds.skip_binders().to_vec()),
|
||
where_clauses: make_only_type_binders(0, vec![]),
|
||
};
|
||
chalk_ir::Binders::new(binders, bound)
|
||
}
|
||
crate::ImplTraitId::AsyncBlockTypeImplTrait(..) => {
|
||
if let Some((future_trait, future_output)) = self
|
||
.db
|
||
.lang_item(self.krate, "future_trait".into())
|
||
.and_then(|item| item.as_trait())
|
||
.and_then(|trait_| {
|
||
let alias =
|
||
self.db.trait_data(trait_).associated_type_by_name(&name![Output])?;
|
||
Some((trait_, alias))
|
||
})
|
||
{
|
||
// Making up Symbol’s value as variable is void: AsyncBlock<T>:
|
||
//
|
||
// |--------------------OpaqueTyDatum-------------------|
|
||
// |-------------OpaqueTyDatumBound--------------|
|
||
// for<T> <Self> [Future<Self>, Future::Output<Self> = T]
|
||
// ^1 ^0 ^0 ^0 ^1
|
||
let impl_bound = WhereClause::Implemented(TraitRef {
|
||
trait_id: to_chalk_trait_id(future_trait),
|
||
// Self type as the first parameter.
|
||
substitution: Substitution::from1(
|
||
&Interner,
|
||
TyKind::BoundVar(BoundVar {
|
||
debruijn: DebruijnIndex::INNERMOST,
|
||
index: 0,
|
||
})
|
||
.intern(&Interner),
|
||
),
|
||
});
|
||
let proj_bound = WhereClause::AliasEq(AliasEq {
|
||
alias: AliasTy::Projection(ProjectionTy {
|
||
associated_ty_id: to_assoc_type_id(future_output),
|
||
// Self type as the first parameter.
|
||
substitution: Substitution::from1(
|
||
&Interner,
|
||
TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0))
|
||
.intern(&Interner),
|
||
),
|
||
}),
|
||
// The parameter of the opaque type.
|
||
ty: TyKind::BoundVar(BoundVar { debruijn: DebruijnIndex::ONE, index: 0 })
|
||
.intern(&Interner),
|
||
});
|
||
let bound = OpaqueTyDatumBound {
|
||
bounds: make_only_type_binders(
|
||
1,
|
||
vec![
|
||
crate::wrap_empty_binders(impl_bound),
|
||
crate::wrap_empty_binders(proj_bound),
|
||
],
|
||
),
|
||
where_clauses: make_only_type_binders(0, vec![]),
|
||
};
|
||
// The opaque type has 1 parameter.
|
||
make_only_type_binders(1, bound)
|
||
} else {
|
||
// If failed to find Symbol’s value as variable is void: Future::Output, return empty bounds as fallback.
|
||
let bound = OpaqueTyDatumBound {
|
||
bounds: make_only_type_binders(0, vec![]),
|
||
where_clauses: make_only_type_binders(0, vec![]),
|
||
};
|
||
// The opaque type has 1 parameter.
|
||
make_only_type_binders(1, bound)
|
||
}
|
||
}
|
||
};
|
||
|
||
Arc::new(OpaqueTyDatum { opaque_ty_id: id, bound })
|
||
}
|
||
|
||
fn hidden_opaque_type(&self, _id: chalk_ir::OpaqueTyId<Interner>) -> chalk_ir::Ty<Interner> {
|
||
// FIXME: actually provide the hidden type; it is relevant for auto traits
|
||
TyKind::Error.intern(&Interner)
|
||
}
|
||
|
||
fn is_object_safe(&self, _trait_id: chalk_ir::TraitId<Interner>) -> bool {
|
||
// FIXME: implement actual object safety
|
||
true
|
||
}
|
||
|
||
fn closure_kind(
|
||
&self,
|
||
_closure_id: chalk_ir::ClosureId<Interner>,
|
||
_substs: &chalk_ir::Substitution<Interner>,
|
||
) -> rust_ir::ClosureKind {
|
||
// Fn is the closure kind that implements all three traits
|
||
rust_ir::ClosureKind::Fn
|
||
}
|
||
fn closure_inputs_and_output(
|
||
&self,
|
||
_closure_id: chalk_ir::ClosureId<Interner>,
|
||
substs: &chalk_ir::Substitution<Interner>,
|
||
) -> chalk_ir::Binders<rust_ir::FnDefInputsAndOutputDatum<Interner>> {
|
||
let sig_ty = substs.at(&Interner, 0).assert_ty_ref(&Interner).clone();
|
||
let sig = &sig_ty.callable_sig(self.db).expect("first closure param should be fn ptr");
|
||
let io = rust_ir::FnDefInputsAndOutputDatum {
|
||
argument_types: sig.params().to_vec(),
|
||
return_type: sig.ret().clone(),
|
||
};
|
||
make_only_type_binders(0, io.shifted_in(&Interner))
|
||
}
|
||
fn closure_upvars(
|
||
&self,
|
||
_closure_id: chalk_ir::ClosureId<Interner>,
|
||
_substs: &chalk_ir::Substitution<Interner>,
|
||
) -> chalk_ir::Binders<chalk_ir::Ty<Interner>> {
|
||
let ty = TyBuilder::unit();
|
||
make_only_type_binders(0, ty)
|
||
}
|
||
fn closure_fn_substitution(
|
||
&self,
|
||
_closure_id: chalk_ir::ClosureId<Interner>,
|
||
_substs: &chalk_ir::Substitution<Interner>,
|
||
) -> chalk_ir::Substitution<Interner> {
|
||
Substitution::empty(&Interner)
|
||
}
|
||
|
||
fn trait_name(&self, trait_id: chalk_ir::TraitId<Interner>) -> String {
|
||
let id = from_chalk_trait_id(trait_id);
|
||
self.db.trait_data(id).name.to_string()
|
||
}
|
||
fn adt_name(&self, chalk_ir::AdtId(adt_id): AdtId) -> String {
|
||
match adt_id {
|
||
hir_def::AdtId::StructId(id) => self.db.struct_data(id).name.to_string(),
|
||
hir_def::AdtId::EnumId(id) => self.db.enum_data(id).name.to_string(),
|
||
hir_def::AdtId::UnionId(id) => self.db.union_data(id).name.to_string(),
|
||
}
|
||
}
|
||
fn assoc_type_name(&self, assoc_ty_id: chalk_ir::AssocTypeId<Interner>) -> String {
|
||
let id = self.db.associated_ty_data(assoc_ty_id).name;
|
||
self.db.type_alias_data(id).name.to_string()
|
||
}
|
||
fn opaque_type_name(&self, opaque_ty_id: chalk_ir::OpaqueTyId<Interner>) -> String {
|
||
format!("Opaque_{}", opaque_ty_id.0)
|
||
}
|
||
fn fn_def_name(&self, fn_def_id: chalk_ir::FnDefId<Interner>) -> String {
|
||
format!("fn_{}", fn_def_id.0)
|
||
}
|
||
fn generator_datum(
|
||
&self,
|
||
_: chalk_ir::GeneratorId<Interner>,
|
||
) -> std::sync::Arc<chalk_solve::rust_ir::GeneratorDatum<Interner>> {
|
||
// FIXME
|
||
unimplemented!()
|
||
}
|
||
fn generator_witness_datum(
|
||
&self,
|
||
_: chalk_ir::GeneratorId<Interner>,
|
||
) -> std::sync::Arc<chalk_solve::rust_ir::GeneratorWitnessDatum<Interner>> {
|
||
// FIXME
|
||
unimplemented!()
|
||
}
|
||
|
||
fn unification_database(&self) -> &dyn chalk_ir::UnificationDatabase<Interner> {
|
||
&self.db
|
||
}
|
||
}
|
||
|
||
impl<'a> chalk_ir::UnificationDatabase<Interner> for &'a dyn HirDatabase {
|
||
fn fn_def_variance(
|
||
&self,
|
||
fn_def_id: chalk_ir::FnDefId<Interner>,
|
||
) -> chalk_ir::Variances<Interner> {
|
||
HirDatabase::fn_def_variance(*self, fn_def_id)
|
||
}
|
||
|
||
fn adt_variance(&self, adt_id: chalk_ir::AdtId<Interner>) -> chalk_ir::Variances<Interner> {
|
||
HirDatabase::adt_variance(*self, adt_id)
|
||
}
|
||
}
|
||
|
||
pub(crate) fn program_clauses_for_chalk_env_query(
|
||
db: &dyn HirDatabase,
|
||
krate: CrateId,
|
||
environment: chalk_ir::Environment<Interner>,
|
||
) -> chalk_ir::ProgramClauses<Interner> {
|
||
chalk_solve::program_clauses_for_env(&ChalkContext { db, krate }, &environment)
|
||
}
|
||
|
||
pub(crate) fn associated_ty_data_query(
|
||
db: &dyn HirDatabase,
|
||
id: AssocTypeId,
|
||
) -> Arc<AssociatedTyDatum> {
|
||
debug!("associated_ty_data {:?}", id);
|
||
let type_alias: TypeAliasId = from_assoc_type_id(id);
|
||
let trait_ = match type_alias.lookup(db.upcast()).container {
|
||
ItemContainerId::TraitId(t) => t,
|
||
_ => panic!("associated type not in trait"),
|
||
};
|
||
|
||
// Lower bounds -- we could/should maybe move this to a separate query in `lower`
|
||
let type_alias_data = db.type_alias_data(type_alias);
|
||
let generic_params = generics(db.upcast(), type_alias.into());
|
||
// let bound_vars = generic_params.bound_vars_subst(DebruijnIndex::INNERMOST);
|
||
let resolver = hir_def::resolver::HasResolver::resolver(type_alias, db.upcast());
|
||
let ctx = crate::TyLoweringContext::new(db, &resolver)
|
||
.with_type_param_mode(crate::lower::TypeParamLoweringMode::Variable);
|
||
let self_ty =
|
||
TyKind::BoundVar(BoundVar::new(crate::DebruijnIndex::INNERMOST, 0)).intern(&Interner);
|
||
let mut bounds: Vec<_> = type_alias_data
|
||
.bounds
|
||
.iter()
|
||
.flat_map(|bound| ctx.lower_type_bound(bound, self_ty.clone(), false))
|
||
.filter_map(|pred| generic_predicate_to_inline_bound(db, &pred, &self_ty))
|
||
.collect();
|
||
|
||
if !ctx.unsized_types.borrow().contains(&self_ty) {
|
||
let sized_trait = resolver
|
||
.krate()
|
||
.and_then(|krate| db.lang_item(krate, "sized".into()))
|
||
.and_then(|lang_item| lang_item.as_trait().map(to_chalk_trait_id));
|
||
let sized_bound = sized_trait.into_iter().map(|sized_trait| {
|
||
let trait_bound =
|
||
rust_ir::TraitBound { trait_id: sized_trait, args_no_self: Default::default() };
|
||
let inline_bound = rust_ir::InlineBound::TraitBound(trait_bound);
|
||
chalk_ir::Binders::empty(&Interner, inline_bound)
|
||
});
|
||
bounds.extend(sized_bound);
|
||
bounds.shrink_to_fit();
|
||
}
|
||
|
||
// FIXME: Re-enable where clauses on associated types when an upstream chalk bug is fixed.
|
||
// (rust-analyzer#9052)
|
||
// let where_clauses = convert_where_clauses(db, type_alias.into(), &bound_vars);
|
||
let bound_data = rust_ir::AssociatedTyDatumBound { bounds, where_clauses: vec![] };
|
||
let datum = AssociatedTyDatum {
|
||
trait_id: to_chalk_trait_id(trait_),
|
||
id,
|
||
name: type_alias,
|
||
binders: make_only_type_binders(generic_params.len(), bound_data),
|
||
};
|
||
Arc::new(datum)
|
||
}
|
||
|
||
pub(crate) fn trait_datum_query(
|
||
db: &dyn HirDatabase,
|
||
krate: CrateId,
|
||
trait_id: TraitId,
|
||
) -> Arc<TraitDatum> {
|
||
debug!("trait_datum {:?}", trait_id);
|
||
let trait_ = from_chalk_trait_id(trait_id);
|
||
let trait_data = db.trait_data(trait_);
|
||
debug!("trait {:?} = {:?}", trait_id, trait_data.name);
|
||
let generic_params = generics(db.upcast(), trait_.into());
|
||
let bound_vars = generic_params.bound_vars_subst(DebruijnIndex::INNERMOST);
|
||
let flags = rust_ir::TraitFlags {
|
||
auto: trait_data.is_auto,
|
||
upstream: trait_.lookup(db.upcast()).container.krate() != krate,
|
||
non_enumerable: true,
|
||
coinductive: false, // only relevant for Chalk testing
|
||
// FIXME: set these flags correctly
|
||
marker: false,
|
||
fundamental: false,
|
||
};
|
||
let where_clauses = convert_where_clauses(db, trait_.into(), &bound_vars);
|
||
let associated_ty_ids = trait_data.associated_types().map(to_assoc_type_id).collect();
|
||
let trait_datum_bound = rust_ir::TraitDatumBound { where_clauses };
|
||
let well_known =
|
||
lang_attr(db.upcast(), trait_).and_then(|name| well_known_trait_from_lang_attr(&name));
|
||
let trait_datum = TraitDatum {
|
||
id: trait_id,
|
||
binders: make_only_type_binders(bound_vars.len(&Interner), trait_datum_bound),
|
||
flags,
|
||
associated_ty_ids,
|
||
well_known,
|
||
};
|
||
Arc::new(trait_datum)
|
||
}
|
||
|
||
fn well_known_trait_from_lang_attr(name: &str) -> Option<WellKnownTrait> {
|
||
Some(match name {
|
||
"sized" => WellKnownTrait::Sized,
|
||
"copy" => WellKnownTrait::Copy,
|
||
"clone" => WellKnownTrait::Clone,
|
||
"drop" => WellKnownTrait::Drop,
|
||
"fn_once" => WellKnownTrait::FnOnce,
|
||
"fn_mut" => WellKnownTrait::FnMut,
|
||
"fn" => WellKnownTrait::Fn,
|
||
"unsize" => WellKnownTrait::Unsize,
|
||
"coerce_unsized" => WellKnownTrait::CoerceUnsized,
|
||
"discriminant_kind" => WellKnownTrait::DiscriminantKind,
|
||
_ => return None,
|
||
})
|
||
}
|
||
|
||
fn lang_attr_from_well_known_trait(attr: WellKnownTrait) -> &'static str {
|
||
match attr {
|
||
WellKnownTrait::Sized => "sized",
|
||
WellKnownTrait::Copy => "copy",
|
||
WellKnownTrait::Clone => "clone",
|
||
WellKnownTrait::Drop => "drop",
|
||
WellKnownTrait::FnOnce => "fn_once",
|
||
WellKnownTrait::FnMut => "fn_mut",
|
||
WellKnownTrait::Fn => "fn",
|
||
WellKnownTrait::Unsize => "unsize",
|
||
WellKnownTrait::Unpin => "unpin",
|
||
WellKnownTrait::CoerceUnsized => "coerce_unsized",
|
||
WellKnownTrait::DiscriminantKind => "discriminant_kind",
|
||
WellKnownTrait::Generator => "generator",
|
||
}
|
||
}
|
||
|
||
pub(crate) fn struct_datum_query(
|
||
db: &dyn HirDatabase,
|
||
krate: CrateId,
|
||
struct_id: AdtId,
|
||
) -> Arc<StructDatum> {
|
||
debug!("struct_datum {:?}", struct_id);
|
||
let chalk_ir::AdtId(adt_id) = struct_id;
|
||
let num_params = generics(db.upcast(), adt_id.into()).len();
|
||
let upstream = adt_id.module(db.upcast()).krate() != krate;
|
||
let where_clauses = {
|
||
let generic_params = generics(db.upcast(), adt_id.into());
|
||
let bound_vars = generic_params.bound_vars_subst(DebruijnIndex::INNERMOST);
|
||
convert_where_clauses(db, adt_id.into(), &bound_vars)
|
||
};
|
||
let flags = rust_ir::AdtFlags {
|
||
upstream,
|
||
// FIXME set fundamental and phantom_data flags correctly
|
||
fundamental: false,
|
||
phantom_data: false,
|
||
};
|
||
// FIXME provide enum variants properly (for auto traits)
|
||
let variant = rust_ir::AdtVariantDatum {
|
||
fields: Vec::new(), // FIXME add fields (only relevant for auto traits),
|
||
};
|
||
let struct_datum_bound = rust_ir::AdtDatumBound { variants: vec![variant], where_clauses };
|
||
let struct_datum = StructDatum {
|
||
// FIXME set ADT kind
|
||
kind: rust_ir::AdtKind::Struct,
|
||
id: struct_id,
|
||
binders: make_only_type_binders(num_params, struct_datum_bound),
|
||
flags,
|
||
};
|
||
Arc::new(struct_datum)
|
||
}
|
||
|
||
pub(crate) fn impl_datum_query(
|
||
db: &dyn HirDatabase,
|
||
krate: CrateId,
|
||
impl_id: ImplId,
|
||
) -> Arc<ImplDatum> {
|
||
let _p = profile::span("impl_datum");
|
||
debug!("impl_datum {:?}", impl_id);
|
||
let impl_: hir_def::ImplId = from_chalk(db, impl_id);
|
||
impl_def_datum(db, krate, impl_id, impl_)
|
||
}
|
||
|
||
fn impl_def_datum(
|
||
db: &dyn HirDatabase,
|
||
krate: CrateId,
|
||
chalk_id: ImplId,
|
||
impl_id: hir_def::ImplId,
|
||
) -> Arc<ImplDatum> {
|
||
let trait_ref = db
|
||
.impl_trait(impl_id)
|
||
// ImplIds for impls where the trait ref can't be resolved should never reach Chalk
|
||
.expect("invalid impl passed to Chalk")
|
||
.into_value_and_skipped_binders()
|
||
.0;
|
||
let impl_data = db.impl_data(impl_id);
|
||
|
||
let generic_params = generics(db.upcast(), impl_id.into());
|
||
let bound_vars = generic_params.bound_vars_subst(DebruijnIndex::INNERMOST);
|
||
let trait_ = trait_ref.hir_trait_id();
|
||
let impl_type = if impl_id.lookup(db.upcast()).container.krate() == krate {
|
||
rust_ir::ImplType::Local
|
||
} else {
|
||
rust_ir::ImplType::External
|
||
};
|
||
let where_clauses = convert_where_clauses(db, impl_id.into(), &bound_vars);
|
||
let negative = impl_data.is_negative;
|
||
debug!(
|
||
"impl {:?}: {}{} where {:?}",
|
||
chalk_id,
|
||
if negative { "!" } else { "" },
|
||
trait_ref.display(db),
|
||
where_clauses
|
||
);
|
||
|
||
let polarity = if negative { rust_ir::Polarity::Negative } else { rust_ir::Polarity::Positive };
|
||
|
||
let impl_datum_bound = rust_ir::ImplDatumBound { trait_ref, where_clauses };
|
||
let trait_data = db.trait_data(trait_);
|
||
let associated_ty_value_ids = impl_data
|
||
.items
|
||
.iter()
|
||
.filter_map(|item| match item {
|
||
AssocItemId::TypeAliasId(type_alias) => Some(*type_alias),
|
||
_ => None,
|
||
})
|
||
.filter(|&type_alias| {
|
||
// don't include associated types that don't exist in the trait
|
||
let name = &db.type_alias_data(type_alias).name;
|
||
trait_data.associated_type_by_name(name).is_some()
|
||
})
|
||
.map(|type_alias| TypeAliasAsValue(type_alias).to_chalk(db))
|
||
.collect();
|
||
debug!("impl_datum: {:?}", impl_datum_bound);
|
||
let impl_datum = ImplDatum {
|
||
binders: make_only_type_binders(bound_vars.len(&Interner), impl_datum_bound),
|
||
impl_type,
|
||
polarity,
|
||
associated_ty_value_ids,
|
||
};
|
||
Arc::new(impl_datum)
|
||
}
|
||
|
||
pub(crate) fn associated_ty_value_query(
|
||
db: &dyn HirDatabase,
|
||
krate: CrateId,
|
||
id: AssociatedTyValueId,
|
||
) -> Arc<AssociatedTyValue> {
|
||
let type_alias: TypeAliasAsValue = from_chalk(db, id);
|
||
type_alias_associated_ty_value(db, krate, type_alias.0)
|
||
}
|
||
|
||
fn type_alias_associated_ty_value(
|
||
db: &dyn HirDatabase,
|
||
_krate: CrateId,
|
||
type_alias: TypeAliasId,
|
||
) -> Arc<AssociatedTyValue> {
|
||
let type_alias_data = db.type_alias_data(type_alias);
|
||
let impl_id = match type_alias.lookup(db.upcast()).container {
|
||
ItemContainerId::ImplId(it) => it,
|
||
_ => panic!("assoc ty value should be in impl"),
|
||
};
|
||
|
||
let trait_ref = db
|
||
.impl_trait(impl_id)
|
||
.expect("assoc ty value should not exist")
|
||
.into_value_and_skipped_binders()
|
||
.0; // we don't return any assoc ty values if the impl'd trait can't be resolved
|
||
|
||
let assoc_ty = db
|
||
.trait_data(trait_ref.hir_trait_id())
|
||
.associated_type_by_name(&type_alias_data.name)
|
||
.expect("assoc ty value should not exist"); // validated when building the impl data as well
|
||
let (ty, binders) = db.ty(type_alias.into()).into_value_and_skipped_binders();
|
||
let value_bound = rust_ir::AssociatedTyValueBound { ty };
|
||
let value = rust_ir::AssociatedTyValue {
|
||
impl_id: impl_id.to_chalk(db),
|
||
associated_ty_id: to_assoc_type_id(assoc_ty),
|
||
value: chalk_ir::Binders::new(binders, value_bound),
|
||
};
|
||
Arc::new(value)
|
||
}
|
||
|
||
pub(crate) fn fn_def_datum_query(
|
||
db: &dyn HirDatabase,
|
||
_krate: CrateId,
|
||
fn_def_id: FnDefId,
|
||
) -> Arc<FnDefDatum> {
|
||
let callable_def: CallableDefId = from_chalk(db, fn_def_id);
|
||
let generic_params = generics(db.upcast(), callable_def.into());
|
||
let (sig, binders) = db.callable_item_signature(callable_def).into_value_and_skipped_binders();
|
||
let bound_vars = generic_params.bound_vars_subst(DebruijnIndex::INNERMOST);
|
||
let where_clauses = convert_where_clauses(db, callable_def.into(), &bound_vars);
|
||
let bound = rust_ir::FnDefDatumBound {
|
||
// Note: Chalk doesn't actually use this information yet as far as I am aware, but we provide it anyway
|
||
inputs_and_output: make_only_type_binders(
|
||
0,
|
||
rust_ir::FnDefInputsAndOutputDatum {
|
||
argument_types: sig.params().to_vec(),
|
||
return_type: sig.ret().clone(),
|
||
}
|
||
.shifted_in(&Interner),
|
||
),
|
||
where_clauses,
|
||
};
|
||
let datum = FnDefDatum {
|
||
id: fn_def_id,
|
||
sig: chalk_ir::FnSig { abi: (), safety: chalk_ir::Safety::Safe, variadic: sig.is_varargs },
|
||
binders: chalk_ir::Binders::new(binders, bound),
|
||
};
|
||
Arc::new(datum)
|
||
}
|
||
|
||
pub(crate) fn fn_def_variance_query(db: &dyn HirDatabase, fn_def_id: FnDefId) -> Variances {
|
||
let callable_def: CallableDefId = from_chalk(db, fn_def_id);
|
||
let generic_params = generics(db.upcast(), callable_def.into());
|
||
Variances::from_iter(
|
||
&Interner,
|
||
std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()),
|
||
)
|
||
}
|
||
|
||
pub(crate) fn adt_variance_query(
|
||
db: &dyn HirDatabase,
|
||
chalk_ir::AdtId(adt_id): AdtId,
|
||
) -> Variances {
|
||
let generic_params = generics(db.upcast(), adt_id.into());
|
||
Variances::from_iter(
|
||
&Interner,
|
||
std::iter::repeat(chalk_ir::Variance::Invariant).take(generic_params.len()),
|
||
)
|
||
}
|
||
|
||
pub(super) fn convert_where_clauses(
|
||
db: &dyn HirDatabase,
|
||
def: GenericDefId,
|
||
substs: &Substitution,
|
||
) -> Vec<chalk_ir::QuantifiedWhereClause<Interner>> {
|
||
let generic_predicates = db.generic_predicates(def);
|
||
let mut result = Vec::with_capacity(generic_predicates.len());
|
||
for pred in generic_predicates.iter() {
|
||
result.push(pred.clone().substitute(&Interner, substs));
|
||
}
|
||
result
|
||
}
|
||
|
||
pub(super) fn generic_predicate_to_inline_bound(
|
||
db: &dyn HirDatabase,
|
||
pred: &QuantifiedWhereClause,
|
||
self_ty: &Ty,
|
||
) -> Option<chalk_ir::Binders<rust_ir::InlineBound<Interner>>> {
|
||
// An InlineBound is like a GenericPredicate, except the self type is left out.
|
||
// We don't have a special type for this, but Chalk does.
|
||
let self_ty_shifted_in = self_ty.clone().shifted_in_from(&Interner, DebruijnIndex::ONE);
|
||
let (pred, binders) = pred.as_ref().into_value_and_skipped_binders();
|
||
match pred {
|
||
WhereClause::Implemented(trait_ref) => {
|
||
if trait_ref.self_type_parameter(&Interner) != self_ty_shifted_in {
|
||
// we can only convert predicates back to type bounds if they
|
||
// have the expected self type
|
||
return None;
|
||
}
|
||
let args_no_self = trait_ref.substitution.as_slice(&Interner)[1..]
|
||
.iter()
|
||
.map(|ty| ty.clone().cast(&Interner))
|
||
.collect();
|
||
let trait_bound = rust_ir::TraitBound { trait_id: trait_ref.trait_id, args_no_self };
|
||
Some(chalk_ir::Binders::new(binders, rust_ir::InlineBound::TraitBound(trait_bound)))
|
||
}
|
||
WhereClause::AliasEq(AliasEq { alias: AliasTy::Projection(projection_ty), ty }) => {
|
||
if projection_ty.self_type_parameter(&Interner) != self_ty_shifted_in {
|
||
return None;
|
||
}
|
||
let trait_ = projection_ty.trait_(db);
|
||
let args_no_self = projection_ty.substitution.as_slice(&Interner)[1..]
|
||
.iter()
|
||
.map(|ty| ty.clone().cast(&Interner))
|
||
.collect();
|
||
let alias_eq_bound = rust_ir::AliasEqBound {
|
||
value: ty.clone(),
|
||
trait_bound: rust_ir::TraitBound {
|
||
trait_id: to_chalk_trait_id(trait_),
|
||
args_no_self,
|
||
},
|
||
associated_ty_id: projection_ty.associated_ty_id,
|
||
parameters: Vec::new(), // FIXME we don't support generic associated types yet
|
||
};
|
||
Some(chalk_ir::Binders::new(
|
||
binders,
|
||
rust_ir::InlineBound::AliasEqBound(alias_eq_bound),
|
||
))
|
||
}
|
||
_ => None,
|
||
}
|
||
}
|