640 lines
26 KiB
Rust
640 lines
26 KiB
Rust
//! Provides the `RustIrDatabase` implementation for `chalk-solve`
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//!
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//! The purpose of the `chalk_solve::RustIrDatabase` is to get data about
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//! specific types, such as bounds, where clauses, or fields. This file contains
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//! the minimal logic to assemble the types for `chalk-solve` by calling out to
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//! either the `TyCtxt` (for information about types) or
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//! `crate::chalk::lowering` (to lower rustc types into Chalk types).
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use rustc_middle::traits::ChalkRustInterner as RustInterner;
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use rustc_middle::ty::subst::{InternalSubsts, Subst, SubstsRef};
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use rustc_middle::ty::{self, AssocItemContainer, AssocKind, TyCtxt, TypeFoldable};
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use rustc_hir::def_id::DefId;
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use rustc_span::symbol::sym;
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use std::fmt;
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use std::sync::Arc;
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use crate::chalk::lowering::{self, LowerInto};
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use rustc_ast::ast;
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pub struct RustIrDatabase<'tcx> {
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pub(crate) interner: RustInterner<'tcx>,
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pub(crate) reempty_placeholder: ty::Region<'tcx>,
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}
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impl fmt::Debug for RustIrDatabase<'_> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "RustIrDatabase")
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}
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}
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impl<'tcx> RustIrDatabase<'tcx> {
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fn where_clauses_for(
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&self,
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def_id: DefId,
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bound_vars: SubstsRef<'tcx>,
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) -> Vec<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>> {
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let predicates = self.interner.tcx.predicates_of(def_id).predicates;
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let mut regions_substitutor =
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lowering::RegionsSubstitutor::new(self.interner.tcx, self.reempty_placeholder);
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predicates
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.iter()
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.map(|(wc, _)| wc.subst(self.interner.tcx, bound_vars))
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.map(|wc| wc.fold_with(&mut regions_substitutor))
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.filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect()
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}
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fn bounds_for<T>(&self, def_id: DefId, bound_vars: SubstsRef<'tcx>) -> Vec<T>
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where
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ty::Predicate<'tcx>: LowerInto<'tcx, std::option::Option<T>>,
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{
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self.interner
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.tcx
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.explicit_item_bounds(def_id)
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.iter()
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.map(|(bound, _)| bound.subst(self.interner.tcx, &bound_vars))
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.filter_map(|bound| LowerInto::<Option<_>>::lower_into(bound, &self.interner))
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.collect()
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}
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}
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impl<'tcx> chalk_solve::RustIrDatabase<RustInterner<'tcx>> for RustIrDatabase<'tcx> {
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fn interner(&self) -> &RustInterner<'tcx> {
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&self.interner
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}
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fn associated_ty_data(
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&self,
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assoc_type_id: chalk_ir::AssocTypeId<RustInterner<'tcx>>,
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) -> Arc<chalk_solve::rust_ir::AssociatedTyDatum<RustInterner<'tcx>>> {
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let def_id = assoc_type_id.0;
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let assoc_item = self.interner.tcx.associated_item(def_id);
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let trait_def_id = match assoc_item.container {
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AssocItemContainer::TraitContainer(def_id) => def_id,
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_ => unimplemented!("Not possible??"),
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};
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match assoc_item.kind {
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AssocKind::Type => {}
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_ => unimplemented!("Not possible??"),
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}
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let bound_vars = bound_vars_for_item(self.interner.tcx, def_id);
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let binders = binders_for(&self.interner, bound_vars);
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let where_clauses = self.where_clauses_for(def_id, bound_vars);
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let bounds = self.bounds_for(def_id, bound_vars);
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Arc::new(chalk_solve::rust_ir::AssociatedTyDatum {
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trait_id: chalk_ir::TraitId(trait_def_id),
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id: assoc_type_id,
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name: (),
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binders: chalk_ir::Binders::new(
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binders,
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chalk_solve::rust_ir::AssociatedTyDatumBound { bounds, where_clauses },
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),
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})
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}
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fn trait_datum(
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&self,
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trait_id: chalk_ir::TraitId<RustInterner<'tcx>>,
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) -> Arc<chalk_solve::rust_ir::TraitDatum<RustInterner<'tcx>>> {
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let def_id = trait_id.0;
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let trait_def = self.interner.tcx.trait_def(def_id);
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let bound_vars = bound_vars_for_item(self.interner.tcx, def_id);
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let binders = binders_for(&self.interner, bound_vars);
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let where_clauses = self.where_clauses_for(def_id, bound_vars);
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let associated_ty_ids: Vec<_> = self
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.interner
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.tcx
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.associated_items(def_id)
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.in_definition_order()
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.filter(|i| i.kind == AssocKind::Type)
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.map(|i| chalk_ir::AssocTypeId(i.def_id))
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.collect();
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let well_known = if self.interner.tcx.lang_items().sized_trait() == Some(def_id) {
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Some(chalk_solve::rust_ir::WellKnownTrait::Sized)
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} else if self.interner.tcx.lang_items().copy_trait() == Some(def_id) {
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Some(chalk_solve::rust_ir::WellKnownTrait::Copy)
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} else if self.interner.tcx.lang_items().clone_trait() == Some(def_id) {
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Some(chalk_solve::rust_ir::WellKnownTrait::Clone)
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} else if self.interner.tcx.lang_items().drop_trait() == Some(def_id) {
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Some(chalk_solve::rust_ir::WellKnownTrait::Drop)
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} else if self.interner.tcx.lang_items().fn_trait() == Some(def_id) {
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Some(chalk_solve::rust_ir::WellKnownTrait::Fn)
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} else if self
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.interner
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.tcx
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.lang_items()
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.fn_once_trait()
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.map(|t| def_id == t)
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.unwrap_or(false)
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{
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Some(chalk_solve::rust_ir::WellKnownTrait::FnOnce)
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} else if self
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.interner
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.tcx
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.lang_items()
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.fn_mut_trait()
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.map(|t| def_id == t)
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.unwrap_or(false)
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{
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Some(chalk_solve::rust_ir::WellKnownTrait::FnMut)
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} else {
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None
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};
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Arc::new(chalk_solve::rust_ir::TraitDatum {
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id: trait_id,
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binders: chalk_ir::Binders::new(
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binders,
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chalk_solve::rust_ir::TraitDatumBound { where_clauses },
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),
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flags: chalk_solve::rust_ir::TraitFlags {
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auto: trait_def.has_auto_impl,
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marker: trait_def.is_marker,
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upstream: !def_id.is_local(),
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fundamental: self.interner.tcx.has_attr(def_id, sym::fundamental),
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non_enumerable: true,
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coinductive: false,
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},
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associated_ty_ids,
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well_known,
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})
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}
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fn adt_datum(
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&self,
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adt_id: chalk_ir::AdtId<RustInterner<'tcx>>,
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) -> Arc<chalk_solve::rust_ir::AdtDatum<RustInterner<'tcx>>> {
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let adt_def = adt_id.0;
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let bound_vars = bound_vars_for_item(self.interner.tcx, adt_def.did);
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let binders = binders_for(&self.interner, bound_vars);
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let where_clauses = self.where_clauses_for(adt_def.did, bound_vars);
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let variants: Vec<_> = adt_def
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.variants
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.iter()
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.map(|variant| chalk_solve::rust_ir::AdtVariantDatum {
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fields: variant
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.fields
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.iter()
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.map(|field| field.ty(self.interner.tcx, bound_vars).lower_into(&self.interner))
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.collect(),
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})
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.collect();
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Arc::new(chalk_solve::rust_ir::AdtDatum {
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id: adt_id,
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binders: chalk_ir::Binders::new(
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binders,
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chalk_solve::rust_ir::AdtDatumBound { variants, where_clauses },
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),
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flags: chalk_solve::rust_ir::AdtFlags {
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upstream: !adt_def.did.is_local(),
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fundamental: adt_def.is_fundamental(),
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phantom_data: adt_def.is_phantom_data(),
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},
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kind: match adt_def.adt_kind() {
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ty::AdtKind::Struct => chalk_solve::rust_ir::AdtKind::Struct,
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ty::AdtKind::Union => chalk_solve::rust_ir::AdtKind::Union,
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ty::AdtKind::Enum => chalk_solve::rust_ir::AdtKind::Enum,
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},
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})
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}
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fn adt_repr(
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&self,
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adt_id: chalk_ir::AdtId<RustInterner<'tcx>>,
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) -> chalk_solve::rust_ir::AdtRepr {
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let adt_def = adt_id.0;
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chalk_solve::rust_ir::AdtRepr {
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repr_c: adt_def.repr.c(),
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repr_packed: adt_def.repr.packed(),
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}
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}
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fn fn_def_datum(
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&self,
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fn_def_id: chalk_ir::FnDefId<RustInterner<'tcx>>,
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) -> Arc<chalk_solve::rust_ir::FnDefDatum<RustInterner<'tcx>>> {
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let def_id = fn_def_id.0;
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let bound_vars = bound_vars_for_item(self.interner.tcx, def_id);
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let binders = binders_for(&self.interner, bound_vars);
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let where_clauses = self.where_clauses_for(def_id, bound_vars);
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let sig = self.interner.tcx.fn_sig(def_id);
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let (inputs_and_output, iobinders, _) = crate::chalk::lowering::collect_bound_vars(
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&self.interner,
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self.interner.tcx,
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&sig.inputs_and_output().subst(self.interner.tcx, bound_vars),
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);
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let argument_types = inputs_and_output[..inputs_and_output.len() - 1]
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.iter()
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.map(|t| t.subst(self.interner.tcx, &bound_vars).lower_into(&self.interner))
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.collect();
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let return_type = inputs_and_output[inputs_and_output.len() - 1]
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.subst(self.interner.tcx, &bound_vars)
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.lower_into(&self.interner);
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let bound = chalk_solve::rust_ir::FnDefDatumBound {
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inputs_and_output: chalk_ir::Binders::new(
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iobinders,
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chalk_solve::rust_ir::FnDefInputsAndOutputDatum { argument_types, return_type },
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),
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where_clauses,
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};
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Arc::new(chalk_solve::rust_ir::FnDefDatum {
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id: fn_def_id,
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sig: sig.lower_into(&self.interner),
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binders: chalk_ir::Binders::new(binders, bound),
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})
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}
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fn impl_datum(
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&self,
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impl_id: chalk_ir::ImplId<RustInterner<'tcx>>,
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) -> Arc<chalk_solve::rust_ir::ImplDatum<RustInterner<'tcx>>> {
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let def_id = impl_id.0;
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let bound_vars = bound_vars_for_item(self.interner.tcx, def_id);
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let binders = binders_for(&self.interner, bound_vars);
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let trait_ref = self.interner.tcx.impl_trait_ref(def_id).expect("not an impl");
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let trait_ref = trait_ref.subst(self.interner.tcx, bound_vars);
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let mut regions_substitutor =
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lowering::RegionsSubstitutor::new(self.interner.tcx, self.reempty_placeholder);
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let trait_ref = trait_ref.fold_with(&mut regions_substitutor);
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let where_clauses = self.where_clauses_for(def_id, bound_vars);
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let value = chalk_solve::rust_ir::ImplDatumBound {
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trait_ref: trait_ref.lower_into(&self.interner),
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where_clauses,
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};
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Arc::new(chalk_solve::rust_ir::ImplDatum {
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polarity: chalk_solve::rust_ir::Polarity::Positive,
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binders: chalk_ir::Binders::new(binders, value),
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impl_type: chalk_solve::rust_ir::ImplType::Local,
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associated_ty_value_ids: vec![],
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})
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}
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fn impls_for_trait(
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&self,
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trait_id: chalk_ir::TraitId<RustInterner<'tcx>>,
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parameters: &[chalk_ir::GenericArg<RustInterner<'tcx>>],
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_binders: &chalk_ir::CanonicalVarKinds<RustInterner<'tcx>>,
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) -> Vec<chalk_ir::ImplId<RustInterner<'tcx>>> {
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let def_id = trait_id.0;
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// FIXME(chalk): use TraitDef::for_each_relevant_impl, but that will
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// require us to be able to interconvert `Ty<'tcx>`, and we're
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// not there yet.
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let all_impls = self.interner.tcx.all_impls(def_id);
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let matched_impls = all_impls.filter(|impl_def_id| {
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use chalk_ir::could_match::CouldMatch;
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let trait_ref = self.interner.tcx.impl_trait_ref(*impl_def_id).unwrap();
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let bound_vars = bound_vars_for_item(self.interner.tcx, *impl_def_id);
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let self_ty = trait_ref.self_ty();
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let self_ty = self_ty.subst(self.interner.tcx, bound_vars);
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let mut regions_substitutor =
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lowering::RegionsSubstitutor::new(self.interner.tcx, self.reempty_placeholder);
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let self_ty = self_ty.fold_with(&mut regions_substitutor);
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let lowered_ty = self_ty.lower_into(&self.interner);
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parameters[0].assert_ty_ref(&self.interner).could_match(&self.interner, &lowered_ty)
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});
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let impls = matched_impls.map(chalk_ir::ImplId).collect();
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impls
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}
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fn impl_provided_for(
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&self,
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auto_trait_id: chalk_ir::TraitId<RustInterner<'tcx>>,
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chalk_ty: &chalk_ir::TyKind<RustInterner<'tcx>>,
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) -> bool {
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use chalk_ir::Scalar::*;
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use chalk_ir::TyKind::*;
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let trait_def_id = auto_trait_id.0;
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let all_impls = self.interner.tcx.all_impls(trait_def_id);
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for impl_def_id in all_impls {
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let trait_ref = self.interner.tcx.impl_trait_ref(impl_def_id).unwrap();
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let self_ty = trait_ref.self_ty();
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let provides = match (self_ty.kind(), chalk_ty) {
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(&ty::Adt(impl_adt_def, ..), Adt(id, ..)) => impl_adt_def.did == id.0.did,
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(_, AssociatedType(_ty_id, ..)) => {
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// FIXME(chalk): See https://github.com/rust-lang/rust/pull/77152#discussion_r494484774
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false
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}
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(ty::Bool, Scalar(Bool)) => true,
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(ty::Char, Scalar(Char)) => true,
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(ty::Int(ty1), Scalar(Int(ty2))) => matches!(
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(ty1, ty2),
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(ast::IntTy::Isize, chalk_ir::IntTy::Isize)
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| (ast::IntTy::I8, chalk_ir::IntTy::I8)
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| (ast::IntTy::I16, chalk_ir::IntTy::I16)
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| (ast::IntTy::I32, chalk_ir::IntTy::I32)
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| (ast::IntTy::I64, chalk_ir::IntTy::I64)
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| (ast::IntTy::I128, chalk_ir::IntTy::I128)
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),
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(ty::Uint(ty1), Scalar(Uint(ty2))) => matches!(
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(ty1, ty2),
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(ast::UintTy::Usize, chalk_ir::UintTy::Usize)
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| (ast::UintTy::U8, chalk_ir::UintTy::U8)
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| (ast::UintTy::U16, chalk_ir::UintTy::U16)
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| (ast::UintTy::U32, chalk_ir::UintTy::U32)
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| (ast::UintTy::U64, chalk_ir::UintTy::U64)
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| (ast::UintTy::U128, chalk_ir::UintTy::U128)
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),
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(ty::Float(ty1), Scalar(Float(ty2))) => matches!(
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(ty1, ty2),
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(ast::FloatTy::F32, chalk_ir::FloatTy::F32)
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| (ast::FloatTy::F64, chalk_ir::FloatTy::F64)
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),
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(&ty::Tuple(substs), Tuple(len, _)) => substs.len() == *len,
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(&ty::Array(..), Array(..)) => true,
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(&ty::Slice(..), Slice(..)) => true,
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(&ty::RawPtr(type_and_mut), Raw(mutability, _)) => {
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match (type_and_mut.mutbl, mutability) {
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(ast::Mutability::Mut, chalk_ir::Mutability::Mut) => true,
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(ast::Mutability::Mut, chalk_ir::Mutability::Not) => false,
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(ast::Mutability::Not, chalk_ir::Mutability::Mut) => false,
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(ast::Mutability::Not, chalk_ir::Mutability::Not) => true,
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}
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}
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(&ty::Ref(.., mutability1), Ref(mutability2, ..)) => {
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match (mutability1, mutability2) {
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(ast::Mutability::Mut, chalk_ir::Mutability::Mut) => true,
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(ast::Mutability::Mut, chalk_ir::Mutability::Not) => false,
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(ast::Mutability::Not, chalk_ir::Mutability::Mut) => false,
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(ast::Mutability::Not, chalk_ir::Mutability::Not) => true,
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}
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}
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(&ty::Opaque(def_id, ..), OpaqueType(opaque_ty_id, ..)) => def_id == opaque_ty_id.0,
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(&ty::FnDef(def_id, ..), FnDef(fn_def_id, ..)) => def_id == fn_def_id.0,
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(&ty::Str, Str) => true,
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(&ty::Never, Never) => true,
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(&ty::Closure(def_id, ..), Closure(closure_id, _)) => def_id == closure_id.0,
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(&ty::Foreign(def_id), Foreign(foreign_def_id)) => def_id == foreign_def_id.0,
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(&ty::Error(..), Error) => false,
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_ => false,
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};
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if provides {
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return true;
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}
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}
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false
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}
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fn associated_ty_value(
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&self,
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associated_ty_id: chalk_solve::rust_ir::AssociatedTyValueId<RustInterner<'tcx>>,
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) -> Arc<chalk_solve::rust_ir::AssociatedTyValue<RustInterner<'tcx>>> {
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let def_id = associated_ty_id.0;
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let assoc_item = self.interner.tcx.associated_item(def_id);
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let impl_id = match assoc_item.container {
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|
AssocItemContainer::TraitContainer(def_id) => def_id,
|
|
_ => unimplemented!("Not possible??"),
|
|
};
|
|
match assoc_item.kind {
|
|
AssocKind::Type => {}
|
|
_ => unimplemented!("Not possible??"),
|
|
}
|
|
let bound_vars = bound_vars_for_item(self.interner.tcx, def_id);
|
|
let binders = binders_for(&self.interner, bound_vars);
|
|
let ty = self.interner.tcx.type_of(def_id);
|
|
|
|
Arc::new(chalk_solve::rust_ir::AssociatedTyValue {
|
|
impl_id: chalk_ir::ImplId(impl_id),
|
|
associated_ty_id: chalk_ir::AssocTypeId(def_id),
|
|
value: chalk_ir::Binders::new(
|
|
binders,
|
|
chalk_solve::rust_ir::AssociatedTyValueBound { ty: ty.lower_into(&self.interner) },
|
|
),
|
|
})
|
|
}
|
|
|
|
fn custom_clauses(&self) -> Vec<chalk_ir::ProgramClause<RustInterner<'tcx>>> {
|
|
vec![]
|
|
}
|
|
|
|
fn local_impls_to_coherence_check(
|
|
&self,
|
|
_trait_id: chalk_ir::TraitId<RustInterner<'tcx>>,
|
|
) -> Vec<chalk_ir::ImplId<RustInterner<'tcx>>> {
|
|
unimplemented!()
|
|
}
|
|
|
|
fn opaque_ty_data(
|
|
&self,
|
|
opaque_ty_id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>,
|
|
) -> Arc<chalk_solve::rust_ir::OpaqueTyDatum<RustInterner<'tcx>>> {
|
|
let bound_vars = bound_vars_for_item(self.interner.tcx, opaque_ty_id.0);
|
|
let binders = binders_for(&self.interner, bound_vars);
|
|
let where_clauses = self.where_clauses_for(opaque_ty_id.0, bound_vars);
|
|
let bounds = self.bounds_for(opaque_ty_id.0, bound_vars);
|
|
|
|
let value = chalk_solve::rust_ir::OpaqueTyDatumBound {
|
|
bounds: chalk_ir::Binders::new(binders.clone(), bounds),
|
|
where_clauses: chalk_ir::Binders::new(binders, where_clauses),
|
|
};
|
|
|
|
Arc::new(chalk_solve::rust_ir::OpaqueTyDatum {
|
|
opaque_ty_id,
|
|
bound: chalk_ir::Binders::empty(&self.interner, value),
|
|
})
|
|
}
|
|
|
|
fn program_clauses_for_env(
|
|
&self,
|
|
environment: &chalk_ir::Environment<RustInterner<'tcx>>,
|
|
) -> chalk_ir::ProgramClauses<RustInterner<'tcx>> {
|
|
chalk_solve::program_clauses_for_env(self, environment)
|
|
}
|
|
|
|
fn well_known_trait_id(
|
|
&self,
|
|
well_known_trait: chalk_solve::rust_ir::WellKnownTrait,
|
|
) -> Option<chalk_ir::TraitId<RustInterner<'tcx>>> {
|
|
use chalk_solve::rust_ir::WellKnownTrait::*;
|
|
let lang_items = self.interner.tcx.lang_items();
|
|
let def_id = match well_known_trait {
|
|
Sized => lang_items.sized_trait(),
|
|
Copy => lang_items.copy_trait(),
|
|
Clone => lang_items.clone_trait(),
|
|
Drop => lang_items.drop_trait(),
|
|
Fn => lang_items.fn_trait(),
|
|
FnMut => lang_items.fn_mut_trait(),
|
|
FnOnce => lang_items.fn_once_trait(),
|
|
Unsize => lang_items.unsize_trait(),
|
|
Unpin => lang_items.unpin_trait(),
|
|
CoerceUnsized => lang_items.coerce_unsized_trait(),
|
|
};
|
|
def_id.map(chalk_ir::TraitId)
|
|
}
|
|
|
|
fn is_object_safe(&self, trait_id: chalk_ir::TraitId<RustInterner<'tcx>>) -> bool {
|
|
self.interner.tcx.is_object_safe(trait_id.0)
|
|
}
|
|
|
|
fn hidden_opaque_type(
|
|
&self,
|
|
_id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>,
|
|
) -> chalk_ir::Ty<RustInterner<'tcx>> {
|
|
// FIXME(chalk): actually get hidden ty
|
|
self.interner
|
|
.tcx
|
|
.mk_ty(ty::Tuple(self.interner.tcx.intern_substs(&[])))
|
|
.lower_into(&self.interner)
|
|
}
|
|
|
|
fn closure_kind(
|
|
&self,
|
|
_closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>,
|
|
substs: &chalk_ir::Substitution<RustInterner<'tcx>>,
|
|
) -> chalk_solve::rust_ir::ClosureKind {
|
|
let kind = &substs.as_slice(&self.interner)[substs.len(&self.interner) - 3];
|
|
match kind.assert_ty_ref(&self.interner).kind(&self.interner) {
|
|
chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Int(int_ty)) => match int_ty {
|
|
chalk_ir::IntTy::I8 => chalk_solve::rust_ir::ClosureKind::Fn,
|
|
chalk_ir::IntTy::I16 => chalk_solve::rust_ir::ClosureKind::FnMut,
|
|
chalk_ir::IntTy::I32 => chalk_solve::rust_ir::ClosureKind::FnOnce,
|
|
_ => bug!("bad closure kind"),
|
|
},
|
|
_ => bug!("bad closure kind"),
|
|
}
|
|
}
|
|
|
|
fn closure_inputs_and_output(
|
|
&self,
|
|
_closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>,
|
|
substs: &chalk_ir::Substitution<RustInterner<'tcx>>,
|
|
) -> chalk_ir::Binders<chalk_solve::rust_ir::FnDefInputsAndOutputDatum<RustInterner<'tcx>>>
|
|
{
|
|
let sig = &substs.as_slice(&self.interner)[substs.len(&self.interner) - 2];
|
|
match sig.assert_ty_ref(&self.interner).kind(&self.interner) {
|
|
chalk_ir::TyKind::Function(f) => {
|
|
let substitution = f.substitution.as_slice(&self.interner);
|
|
let return_type =
|
|
substitution.last().unwrap().assert_ty_ref(&self.interner).clone();
|
|
// Closure arguments are tupled
|
|
let argument_tuple = substitution[0].assert_ty_ref(&self.interner);
|
|
let argument_types = match argument_tuple.kind(&self.interner) {
|
|
chalk_ir::TyKind::Tuple(_len, substitution) => substitution
|
|
.iter(&self.interner)
|
|
.map(|arg| arg.assert_ty_ref(&self.interner))
|
|
.cloned()
|
|
.collect(),
|
|
_ => bug!("Expecting closure FnSig args to be tupled."),
|
|
};
|
|
|
|
chalk_ir::Binders::new(
|
|
chalk_ir::VariableKinds::from_iter(
|
|
&self.interner,
|
|
(0..f.num_binders).map(|_| chalk_ir::VariableKind::Lifetime),
|
|
),
|
|
chalk_solve::rust_ir::FnDefInputsAndOutputDatum { argument_types, return_type },
|
|
)
|
|
}
|
|
_ => panic!("Invalid sig."),
|
|
}
|
|
}
|
|
|
|
fn closure_upvars(
|
|
&self,
|
|
_closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>,
|
|
substs: &chalk_ir::Substitution<RustInterner<'tcx>>,
|
|
) -> chalk_ir::Binders<chalk_ir::Ty<RustInterner<'tcx>>> {
|
|
let inputs_and_output = self.closure_inputs_and_output(_closure_id, substs);
|
|
let tuple = substs.as_slice(&self.interner).last().unwrap().assert_ty_ref(&self.interner);
|
|
inputs_and_output.map_ref(|_| tuple.clone())
|
|
}
|
|
|
|
fn closure_fn_substitution(
|
|
&self,
|
|
_closure_id: chalk_ir::ClosureId<RustInterner<'tcx>>,
|
|
substs: &chalk_ir::Substitution<RustInterner<'tcx>>,
|
|
) -> chalk_ir::Substitution<RustInterner<'tcx>> {
|
|
let substitution = &substs.as_slice(&self.interner)[0..substs.len(&self.interner) - 3];
|
|
chalk_ir::Substitution::from_iter(&self.interner, substitution)
|
|
}
|
|
|
|
fn generator_datum(
|
|
&self,
|
|
_generator_id: chalk_ir::GeneratorId<RustInterner<'tcx>>,
|
|
) -> Arc<chalk_solve::rust_ir::GeneratorDatum<RustInterner<'tcx>>> {
|
|
unimplemented!()
|
|
}
|
|
|
|
fn generator_witness_datum(
|
|
&self,
|
|
_generator_id: chalk_ir::GeneratorId<RustInterner<'tcx>>,
|
|
) -> Arc<chalk_solve::rust_ir::GeneratorWitnessDatum<RustInterner<'tcx>>> {
|
|
unimplemented!()
|
|
}
|
|
}
|
|
|
|
/// Creates a `InternalSubsts` that maps each generic parameter to a higher-ranked
|
|
/// var bound at index `0`. For types, we use a `BoundVar` index equal to
|
|
/// the type parameter index. For regions, we use the `BoundRegion::BrNamed`
|
|
/// variant (which has a `DefId`).
|
|
fn bound_vars_for_item(tcx: TyCtxt<'tcx>, def_id: DefId) -> SubstsRef<'tcx> {
|
|
InternalSubsts::for_item(tcx, def_id, |param, substs| match param.kind {
|
|
ty::GenericParamDefKind::Type { .. } => tcx
|
|
.mk_ty(ty::Bound(
|
|
ty::INNERMOST,
|
|
ty::BoundTy {
|
|
var: ty::BoundVar::from(param.index),
|
|
kind: ty::BoundTyKind::Param(param.name),
|
|
},
|
|
))
|
|
.into(),
|
|
|
|
ty::GenericParamDefKind::Lifetime => tcx
|
|
.mk_region(ty::RegionKind::ReLateBound(
|
|
ty::INNERMOST,
|
|
ty::BoundRegion::BrAnon(substs.len() as u32),
|
|
))
|
|
.into(),
|
|
|
|
ty::GenericParamDefKind::Const => tcx
|
|
.mk_const(ty::Const {
|
|
val: ty::ConstKind::Bound(ty::INNERMOST, ty::BoundVar::from(param.index)),
|
|
ty: tcx.type_of(param.def_id),
|
|
})
|
|
.into(),
|
|
})
|
|
}
|
|
|
|
fn binders_for<'tcx>(
|
|
interner: &RustInterner<'tcx>,
|
|
bound_vars: SubstsRef<'tcx>,
|
|
) -> chalk_ir::VariableKinds<RustInterner<'tcx>> {
|
|
chalk_ir::VariableKinds::from_iter(
|
|
interner,
|
|
bound_vars.iter().map(|arg| match arg.unpack() {
|
|
ty::subst::GenericArgKind::Lifetime(_re) => chalk_ir::VariableKind::Lifetime,
|
|
ty::subst::GenericArgKind::Type(_ty) => {
|
|
chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General)
|
|
}
|
|
ty::subst::GenericArgKind::Const(c) => {
|
|
chalk_ir::VariableKind::Const(c.ty.lower_into(interner))
|
|
}
|
|
}),
|
|
)
|
|
}
|