[−][src]Trait chalk_solve::RustIrDatabase

pub trait RustIrDatabase<I: Interner>: Debug {
    fn custom_clauses(&self) -> Vec<ProgramClause<I>>;

    fn associated_ty_data(
        &self, 
        ty: AssocTypeId<I>
    ) -> Arc<AssociatedTyDatum<I>>;

    fn trait_datum(&self, trait_id: TraitId<I>) -> Arc<TraitDatum<I>>;

    fn adt_datum(&self, adt_id: AdtId<I>) -> Arc<AdtDatum<I>>;

    fn fn_def_datum(&self, fn_def_id: FnDefId<I>) -> Arc<FnDefDatum<I>>;

    fn impl_datum(&self, impl_id: ImplId<I>) -> Arc<ImplDatum<I>>;

    fn associated_ty_value(
        &self, 
        id: AssociatedTyValueId<I>
    ) -> Arc<AssociatedTyValue<I>>;

    fn opaque_ty_data(&self, id: OpaqueTyId<I>) -> Arc<OpaqueTyDatum<I>>;

    fn hidden_opaque_type(&self, id: OpaqueTyId<I>) -> Ty<I>;

    fn impls_for_trait(
        &self, 
        trait_id: TraitId<I>, 
        parameters: &[GenericArg<I>]
    ) -> Vec<ImplId<I>>;

    fn local_impls_to_coherence_check(
        &self, 
        trait_id: TraitId<I>
    ) -> Vec<ImplId<I>>;

    fn impl_provided_for(
        &self, 
        auto_trait_id: TraitId<I>, 
        adt_id: AdtId<I>
    ) -> bool;

    fn well_known_trait_id(
        &self, 
        well_known_trait: WellKnownTrait
    ) -> Option<TraitId<I>>;

    fn program_clauses_for_env(
        &self, 
        environment: &Environment<I>
    ) -> ProgramClauses<I>;

    fn interner(&self) -> &I;

    fn is_object_safe(&self, trait_id: TraitId<I>) -> bool;

    fn closure_kind(
        &self, 
        closure_id: ClosureId<I>, 
        substs: &Substitution<I>
    ) -> ClosureKind;

    fn closure_inputs_and_output(
        &self, 
        closure_id: ClosureId<I>, 
        substs: &Substitution<I>
    ) -> Binders<FnDefInputsAndOutputDatum<I>>;

    fn closure_upvars(
        &self, 
        closure_id: ClosureId<I>, 
        substs: &Substitution<I>
    ) -> Binders<Ty<I>>;

    fn closure_fn_substitution(
        &self, 
        closure_id: ClosureId<I>, 
        substs: &Substitution<I>
    ) -> Substitution<I>;

    fn force_impl_for(
        &self, 
        well_known: WellKnownTrait, 
        ty: &TyData<I>
    ) -> Option<bool> { ... }
}

Required methods

fn custom_clauses(&self) -> Vec<ProgramClause<I>>

Returns any "custom program clauses" that do not derive from Rust IR. Used only in testing the underlying solver.

fn associated_ty_data(&self, ty: AssocTypeId<I>) -> Arc<AssociatedTyDatum<I>>

Returns the datum for the associated type with the given id.

fn trait_datum(&self, trait_id: TraitId<I>) -> Arc<TraitDatum<I>>

Returns the datum for the definition with the given id.

fn adt_datum(&self, adt_id: AdtId<I>) -> Arc<AdtDatum<I>>

Returns the datum for the impl with the given id.

fn fn_def_datum(&self, fn_def_id: FnDefId<I>) -> Arc<FnDefDatum<I>>

fn impl_datum(&self, impl_id: ImplId<I>) -> Arc<ImplDatum<I>>

Returns the datum for the impl with the given id.

fn associated_ty_value(
    &self,
    id: AssociatedTyValueId<I>
) -> Arc<AssociatedTyValue<I>>

Returns the AssociatedTyValue with the given id.

fn opaque_ty_data(&self, id: OpaqueTyId<I>) -> Arc<OpaqueTyDatum<I>>

Returns the OpaqueTyDatum with the given id.

fn hidden_opaque_type(&self, id: OpaqueTyId<I>) -> Ty<I>

Returns the "hidden type" corresponding with the opaque type.

fn impls_for_trait(
    &self,
    trait_id: TraitId<I>,
    parameters: &[GenericArg<I>]
) -> Vec<ImplId<I>>

Returns a list of potentially relevant impls for a given trait-id; we also supply the type parameters that we are trying to match (if known: these parameters may contain inference variables, for example). The implementor is permitted to return any superset of the applicable impls; chalk will narrow down the list to only those that truly apply. The parameters are provided as a "hint" to help the implementor do less work, but can be completely ignored if desired.

fn local_impls_to_coherence_check(&self, trait_id: TraitId<I>) -> Vec<ImplId<I>>

Returns the impls that require coherence checking. This is not the full set of impls that exist:

  • It can exclude impls not defined in the current crate.
  • It can exclude "built-in" impls, like those for closures; only the impls actually written by users need to be checked.

fn impl_provided_for(&self, auto_trait_id: TraitId<I>, adt_id: AdtId<I>) -> bool

Returns true if there is an explicit impl of the auto trait auto_trait_id for the ADT adt_id. This is part of the auto trait handling -- if there is no explicit impl given by the user for the struct, then we provide default impls based on the field types (otherwise, we rely on the impls the user gave).

fn well_known_trait_id(
    &self,
    well_known_trait: WellKnownTrait
) -> Option<TraitId<I>>

Returns id of a trait lang item, if found

fn program_clauses_for_env(
    &self,
    environment: &Environment<I>
) -> ProgramClauses<I>

Calculates program clauses from an env. This is intended to call the program_clauses_for_env function and then possibly cache the clauses.

fn interner(&self) -> &I

fn is_object_safe(&self, trait_id: TraitId<I>) -> bool

Check if a trait is object safe

fn closure_kind(
    &self,
    closure_id: ClosureId<I>,
    substs: &Substitution<I>
) -> ClosureKind

Gets the ClosureKind for a given closure and substitution.

fn closure_inputs_and_output(
    &self,
    closure_id: ClosureId<I>,
    substs: &Substitution<I>
) -> Binders<FnDefInputsAndOutputDatum<I>>

Gets the inputs and output for a given closure id and substitution. We pass both the ClosureId and it's Substituion to give implementors the freedom to store associated data in the substitution (like rustc) or separately (like chalk-integration).

fn closure_upvars(
    &self,
    closure_id: ClosureId<I>,
    substs: &Substitution<I>
) -> Binders<Ty<I>>

Gets the upvars as a Ty for a given closure id and substitution. There are no restrictions on the type of upvars.

fn closure_fn_substitution(
    &self,
    closure_id: ClosureId<I>,
    substs: &Substitution<I>
) -> Substitution<I>

Gets the substitution for the closure when used as a function. For example, for the following (not-quite-)rust code:

ⓘThis example is not tested
let foo = |a: &mut u32| { a += 1; };
let c: &'a u32 = &0;
foo(c);

This would return a Substitution of [&'a]. This could either be substituted into the inputs and output, or into the upvars.

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Provided methods

fn force_impl_for(
    &self,
    well_known: WellKnownTrait,
    ty: &TyData<I>
) -> Option<bool>

A stop-gap solution to force an impl for a given well-known trait. Useful when the logic for a given trait is absent or incomplete. A value of Some(true) means that the the clause for the impl will be added. A value of Some(false) means that the clause for the impl will not be added, and fallback logic will not be checked. A value of None means that the clause will not be added, but fallback logic may add logic.

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Implementors

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