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Boxy
2023-06-08 19:10:07 +01:00
parent 8d1fa473dd
commit 3009b2c647
11 changed files with 929 additions and 402 deletions
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20
compiler/rustc_middle/src/traits/solve.rs
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@@ -11,6 +11,8 @@ use crate::ty::{
TypeVisitor,
};
pub mod inspect;
pub type EvaluationCache<'tcx> = Cache<CanonicalInput<'tcx>, QueryResult<'tcx>>;
/// A goal is a statement, i.e. `predicate`, we want to prove
@@ -18,7 +20,7 @@ pub type EvaluationCache<'tcx> = Cache<CanonicalInput<'tcx>, QueryResult<'tcx>>;
///
/// Most of the time the `param_env` contains the `where`-bounds of the function
/// we're currently typechecking while the `predicate` is some trait bound.
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, TypeFoldable, TypeVisitable)]
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub struct Goal<'tcx, P> {
pub predicate: P,
pub param_env: ty::ParamEnv<'tcx>,
@@ -39,7 +41,7 @@ impl<'tcx, P> Goal<'tcx, P> {
}
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, TypeFoldable, TypeVisitable)]
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub struct Response<'tcx> {
pub certainty: Certainty,
pub var_values: CanonicalVarValues<'tcx>,
@@ -47,7 +49,7 @@ pub struct Response<'tcx> {
pub external_constraints: ExternalConstraints<'tcx>,
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, TypeFoldable, TypeVisitable)]
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub enum Certainty {
Yes,
Maybe(MaybeCause),
@@ -86,7 +88,7 @@ impl Certainty {
}
/// Why we failed to evaluate a goal.
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, TypeFoldable, TypeVisitable)]
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub enum MaybeCause {
/// We failed due to ambiguity. This ambiguity can either
/// be a true ambiguity, i.e. there are multiple different answers,
@@ -96,7 +98,7 @@ pub enum MaybeCause {
Overflow,
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, TypeFoldable, TypeVisitable)]
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub struct QueryInput<'tcx, T> {
pub goal: Goal<'tcx, T>,
pub anchor: DefiningAnchor,
@@ -104,12 +106,12 @@ pub struct QueryInput<'tcx, T> {
}
/// Additional constraints returned on success.
#[derive(Debug, PartialEq, Eq, Clone, Hash, Default)]
#[derive(Debug, PartialEq, Eq, Clone, Hash, HashStable, Default)]
pub struct PredefinedOpaquesData<'tcx> {
pub opaque_types: Vec<(ty::OpaqueTypeKey<'tcx>, Ty<'tcx>)>,
}
#[derive(Debug, PartialEq, Eq, Copy, Clone, Hash)]
#[derive(Debug, PartialEq, Eq, Copy, Clone, Hash, HashStable)]
pub struct PredefinedOpaques<'tcx>(pub(crate) Interned<'tcx, PredefinedOpaquesData<'tcx>>);
impl<'tcx> std::ops::Deref for PredefinedOpaques<'tcx> {
@@ -132,7 +134,7 @@ pub type CanonicalResponse<'tcx> = Canonical<'tcx, Response<'tcx>>;
/// solver, merge the two responses again.
pub type QueryResult<'tcx> = Result<CanonicalResponse<'tcx>, NoSolution>;
#[derive(Debug, PartialEq, Eq, Copy, Clone, Hash)]
#[derive(Debug, PartialEq, Eq, Copy, Clone, Hash, HashStable)]
pub struct ExternalConstraints<'tcx>(pub(crate) Interned<'tcx, ExternalConstraintsData<'tcx>>);
impl<'tcx> std::ops::Deref for ExternalConstraints<'tcx> {
@@ -144,7 +146,7 @@ impl<'tcx> std::ops::Deref for ExternalConstraints<'tcx> {
}
/// Additional constraints returned on success.
#[derive(Debug, PartialEq, Eq, Clone, Hash, Default)]
#[derive(Debug, PartialEq, Eq, Clone, Hash, HashStable, Default)]
pub struct ExternalConstraintsData<'tcx> {
// FIXME: implement this.
pub region_constraints: QueryRegionConstraints<'tcx>,