554 lines
22 KiB
Rust
554 lines
22 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::{ChalkRustDefId as RustDefId, 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};
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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::LowerInto;
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pub struct RustIrDatabase<'tcx> {
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pub tcx: TyCtxt<'tcx>,
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pub interner: RustInterner<'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> 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 = match assoc_type_id.0 {
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RustDefId::AssocTy(def_id) => def_id,
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_ => bug!("Did not use `AssocTy` variant when expecting associated type."),
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};
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let assoc_item = self.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.tcx, def_id);
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let binders = binders_for(&self.interner, bound_vars);
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// FIXME(chalk): this really isn't right I don't think. The functions
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// for GATs are a bit hard to figure out. Are these supposed to be where
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// clauses or bounds?
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let predicates = self.tcx.predicates_defined_on(def_id).predicates;
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let where_clauses: Vec<_> = predicates
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.iter()
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.map(|(wc, _)| wc.subst(self.tcx, &bound_vars))
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.filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect();
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Arc::new(chalk_solve::rust_ir::AssociatedTyDatum {
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trait_id: chalk_ir::TraitId(RustDefId::Trait(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: vec![], 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 = match trait_id.0 {
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RustDefId::Trait(def_id) => def_id,
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_ => bug!("Did not use `Trait` variant when expecting trait."),
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};
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let trait_def = self.tcx.trait_def(def_id);
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let bound_vars = bound_vars_for_item(self.tcx, def_id);
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let binders = binders_for(&self.interner, bound_vars);
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let predicates = self.tcx.predicates_defined_on(def_id).predicates;
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let where_clauses: Vec<_> = predicates
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.iter()
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.map(|(wc, _)| wc.subst(self.tcx, &bound_vars))
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.filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect();
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let well_known =
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if self.tcx.lang_items().sized_trait().map(|t| def_id == t).unwrap_or(false) {
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Some(chalk_solve::rust_ir::WellKnownTrait::SizedTrait)
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} else if self.tcx.lang_items().copy_trait().map(|t| def_id == t).unwrap_or(false) {
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Some(chalk_solve::rust_ir::WellKnownTrait::CopyTrait)
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} else if self.tcx.lang_items().clone_trait().map(|t| def_id == t).unwrap_or(false) {
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Some(chalk_solve::rust_ir::WellKnownTrait::CloneTrait)
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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.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: vec![],
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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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struct_id: chalk_ir::AdtId<RustInterner<'tcx>>,
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) -> Arc<chalk_solve::rust_ir::AdtDatum<RustInterner<'tcx>>> {
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match struct_id.0 {
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RustDefId::Adt(adt_def_id) => {
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let adt_def = self.tcx.adt_def(adt_def_id);
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let bound_vars = bound_vars_for_item(self.tcx, adt_def_id);
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let binders = binders_for(&self.interner, bound_vars);
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let predicates = self.tcx.predicates_of(adt_def_id).predicates;
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let where_clauses: Vec<_> = predicates
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.iter()
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.map(|(wc, _)| wc.subst(self.tcx, bound_vars))
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.filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner))
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.collect();
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let fields = match adt_def.adt_kind() {
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ty::AdtKind::Struct | ty::AdtKind::Union => {
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let variant = adt_def.non_enum_variant();
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variant
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.fields
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.iter()
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.map(|field| {
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self.tcx
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.type_of(field.did)
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.subst(self.tcx, bound_vars)
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.lower_into(&self.interner)
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})
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.collect()
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}
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// FIXME(chalk): handle enums; force_impl_for requires this
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ty::AdtKind::Enum => vec![],
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};
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let struct_datum = Arc::new(chalk_solve::rust_ir::AdtDatum {
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id: struct_id,
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binders: chalk_ir::Binders::new(
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binders,
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chalk_solve::rust_ir::AdtDatumBound { fields, where_clauses },
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),
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flags: chalk_solve::rust_ir::AdtFlags {
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upstream: !adt_def_id.is_local(),
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fundamental: adt_def.is_fundamental(),
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},
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});
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struct_datum
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}
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RustDefId::Array => {
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return Arc::new(chalk_solve::rust_ir::AdtDatum {
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id: struct_id,
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binders: chalk_ir::Binders::new(
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chalk_ir::VariableKinds::from(
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&self.interner,
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Some(chalk_ir::VariableKind::Ty(chalk_ir::TyKind::General)),
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),
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chalk_solve::rust_ir::AdtDatumBound {
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fields: vec![],
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where_clauses: vec![],
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},
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),
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flags: chalk_solve::rust_ir::AdtFlags { upstream: false, fundamental: false },
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});
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}
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RustDefId::Never | RustDefId::FnDef(_) => {
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return Arc::new(chalk_solve::rust_ir::AdtDatum {
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id: struct_id,
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binders: chalk_ir::Binders::new(
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chalk_ir::VariableKinds::new(&self.interner),
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chalk_solve::rust_ir::AdtDatumBound {
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fields: vec![],
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where_clauses: vec![],
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},
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),
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flags: chalk_solve::rust_ir::AdtFlags { upstream: false, fundamental: false },
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});
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}
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v => bug!("Used not struct variant ({:?}) when expecting struct variant.", v),
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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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unimplemented!()
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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 = match impl_id.0 {
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RustDefId::Impl(def_id) => def_id,
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_ => bug!("Did not use `Impl` variant when expecting impl."),
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};
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let bound_vars = bound_vars_for_item(self.tcx, def_id);
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let binders = binders_for(&self.interner, bound_vars);
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let trait_ref = self.tcx.impl_trait_ref(def_id).expect("not an impl");
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let trait_ref = trait_ref.subst(self.tcx, bound_vars);
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let predicates = self.tcx.predicates_of(def_id).predicates;
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let where_clauses: Vec<_> = predicates
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.iter()
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.map(|(wc, _)| wc.subst(self.tcx, bound_vars))
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.filter_map(|wc| LowerInto::<Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>>::lower_into(wc, &self.interner)).collect();
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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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) -> Vec<chalk_ir::ImplId<RustInterner<'tcx>>> {
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let def_id: DefId = match trait_id.0 {
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RustDefId::Trait(def_id) => def_id,
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_ => bug!("Did not use `Trait` variant when expecting trait."),
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};
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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.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.tcx.impl_trait_ref(*impl_def_id).unwrap();
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let bound_vars = bound_vars_for_item(self.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.tcx, bound_vars);
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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
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.map(|matched_impl| chalk_ir::ImplId(RustDefId::Impl(matched_impl)))
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.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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struct_id: chalk_ir::AdtId<RustInterner<'tcx>>,
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) -> bool {
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let trait_def_id: DefId = match auto_trait_id.0 {
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RustDefId::Trait(def_id) => def_id,
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_ => bug!("Did not use `Trait` variant when expecting trait."),
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};
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// FIXME(chalk): this match can be removed when builtin types supported
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match struct_id.0 {
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RustDefId::Adt(_) => {}
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RustDefId::Never => return false,
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RustDefId::Array => return false,
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_ => bug!("Did not use `Adt` variant when expecting adt."),
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}
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let adt_def_id: DefId = match struct_id.0 {
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RustDefId::Adt(def_id) => def_id,
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_ => bug!("Did not use `Adt` variant when expecting adt."),
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};
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let all_impls = self.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.tcx.impl_trait_ref(impl_def_id).unwrap();
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let self_ty = trait_ref.self_ty();
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match self_ty.kind {
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ty::Adt(adt_def, _) => {
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if adt_def.did == adt_def_id {
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return true;
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}
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}
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_ => {}
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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 = match associated_ty_id.0 {
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RustDefId::AssocTy(def_id) => def_id,
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_ => bug!("Did not use `AssocTy` variant when expecting associated type."),
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};
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let assoc_item = self.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,
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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.tcx, def_id);
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let binders = binders_for(&self.interner, bound_vars);
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let ty = self.tcx.type_of(def_id);
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Arc::new(chalk_solve::rust_ir::AssociatedTyValue {
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impl_id: chalk_ir::ImplId(RustDefId::Impl(impl_id)),
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associated_ty_id: chalk_ir::AssocTypeId(RustDefId::AssocTy(def_id)),
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value: chalk_ir::Binders::new(
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binders,
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chalk_solve::rust_ir::AssociatedTyValueBound { ty: ty.lower_into(&self.interner) },
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),
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})
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}
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fn custom_clauses(&self) -> Vec<chalk_ir::ProgramClause<RustInterner<'tcx>>> {
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vec![]
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}
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fn local_impls_to_coherence_check(
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&self,
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_trait_id: chalk_ir::TraitId<RustInterner<'tcx>>,
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) -> Vec<chalk_ir::ImplId<RustInterner<'tcx>>> {
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unimplemented!()
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}
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fn opaque_ty_data(
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&self,
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opaque_ty_id: chalk_ir::OpaqueTyId<RustInterner<'tcx>>,
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) -> Arc<chalk_solve::rust_ir::OpaqueTyDatum<RustInterner<'tcx>>> {
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// FIXME(chalk): actually lower opaque ty
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let hidden_ty =
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self.tcx.mk_ty(ty::Tuple(self.tcx.intern_substs(&[]))).lower_into(&self.interner);
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let value = chalk_solve::rust_ir::OpaqueTyDatumBound {
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hidden_ty,
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bounds: chalk_ir::Binders::new(chalk_ir::VariableKinds::new(&self.interner), vec![]),
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};
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Arc::new(chalk_solve::rust_ir::OpaqueTyDatum {
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opaque_ty_id,
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bound: chalk_ir::Binders::new(chalk_ir::VariableKinds::new(&self.interner), value),
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})
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}
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/// Since Chalk can't handle all Rust types currently, we have to handle
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/// some specially for now. Over time, these `Some` returns will change to
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/// `None` and eventually this function will be removed.
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fn force_impl_for(
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&self,
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well_known: chalk_solve::rust_ir::WellKnownTrait,
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ty: &chalk_ir::TyData<RustInterner<'tcx>>,
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) -> Option<bool> {
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use chalk_ir::TyData::*;
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match well_known {
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chalk_solve::rust_ir::WellKnownTrait::SizedTrait => match ty {
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Apply(apply) => match apply.name {
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chalk_ir::TypeName::Adt(chalk_ir::AdtId(rust_def_id)) => {
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use rustc_middle::traits::ChalkRustDefId::*;
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match rust_def_id {
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Never | Array | FnDef(_) => Some(true),
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Adt(adt_def_id) => {
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let adt_def = self.tcx.adt_def(adt_def_id);
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match adt_def.adt_kind() {
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ty::AdtKind::Struct | ty::AdtKind::Union => None,
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ty::AdtKind::Enum => {
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let constraint = self.tcx.adt_sized_constraint(adt_def_id);
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if !constraint.0.is_empty() {
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unimplemented!()
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} else {
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Some(true)
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}
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}
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}
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}
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Trait(_) | Impl(_) | AssocTy(_) | Opaque(_) => panic!(),
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}
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}
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_ => None,
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},
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Dyn(_)
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| Alias(_)
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| Placeholder(_)
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| Function(_)
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| InferenceVar(_, _)
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| BoundVar(_) => None,
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},
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chalk_solve::rust_ir::WellKnownTrait::CopyTrait
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| chalk_solve::rust_ir::WellKnownTrait::CloneTrait => match ty {
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Apply(apply) => match apply.name {
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chalk_ir::TypeName::Adt(chalk_ir::AdtId(rust_def_id)) => {
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use rustc_middle::traits::ChalkRustDefId::*;
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match rust_def_id {
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Never => Some(false),
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FnDef(_) | Array => Some(true),
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Adt(adt_def_id) => {
|
|
let adt_def = self.tcx.adt_def(adt_def_id);
|
|
match adt_def.adt_kind() {
|
|
ty::AdtKind::Struct | ty::AdtKind::Union => None,
|
|
ty::AdtKind::Enum => {
|
|
let constraint = self.tcx.adt_sized_constraint(adt_def_id);
|
|
if !constraint.0.is_empty() {
|
|
unimplemented!()
|
|
} else {
|
|
Some(true)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Trait(_) | Impl(_) | AssocTy(_) | Opaque(_) => panic!(),
|
|
}
|
|
}
|
|
_ => None,
|
|
},
|
|
Dyn(_)
|
|
| Alias(_)
|
|
| Placeholder(_)
|
|
| Function(_)
|
|
| InferenceVar(_, _)
|
|
| BoundVar(_) => None,
|
|
},
|
|
chalk_solve::rust_ir::WellKnownTrait::DropTrait => None,
|
|
}
|
|
}
|
|
|
|
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 t = match well_known_trait {
|
|
SizedTrait => self
|
|
.tcx
|
|
.lang_items()
|
|
.sized_trait()
|
|
.map(|t| chalk_ir::TraitId(RustDefId::Trait(t)))
|
|
.unwrap(),
|
|
CopyTrait => self
|
|
.tcx
|
|
.lang_items()
|
|
.copy_trait()
|
|
.map(|t| chalk_ir::TraitId(RustDefId::Trait(t)))
|
|
.unwrap(),
|
|
CloneTrait => self
|
|
.tcx
|
|
.lang_items()
|
|
.clone_trait()
|
|
.map(|t| chalk_ir::TraitId(RustDefId::Trait(t)))
|
|
.unwrap(),
|
|
DropTrait => self
|
|
.tcx
|
|
.lang_items()
|
|
.drop_trait()
|
|
.map(|t| chalk_ir::TraitId(RustDefId::Trait(t)))
|
|
.unwrap(),
|
|
};
|
|
Some(t)
|
|
}
|
|
|
|
fn is_object_safe(&self, trait_id: chalk_ir::TraitId<RustInterner<'tcx>>) -> bool {
|
|
let def_id: DefId = match trait_id.0 {
|
|
RustDefId::Trait(def_id) => def_id,
|
|
_ => bug!("Did not use `Trait` variant when expecting trait."),
|
|
};
|
|
self.tcx.is_object_safe(def_id)
|
|
}
|
|
}
|
|
|
|
/// 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(
|
|
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::TyKind::General)
|
|
}
|
|
ty::subst::GenericArgKind::Const(_const) => {
|
|
chalk_ir::VariableKind::Ty(chalk_ir::TyKind::General)
|
|
}
|
|
}),
|
|
)
|
|
}
|