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Auto merge of #96892 - oli-obk:🐌_obligation_cause_code_🐌, r=estebank

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Clean up derived obligation creation

r? `@estebank`

working on fixing the perf regression from https://github.com/rust-lang/rust/pull/91030#issuecomment-1083360210
This commit is contained in:
bors
2022-05-17 01:46:25 +00:00
parent c1cfdd1fb2 0cefa5fa18
commit c1d65eaa45
11 changed files with 176 additions and 219 deletions
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38
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
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@@ -17,17 +17,15 @@ use rustc_middle::ty::{ToPolyTraitRef, ToPredicate};
use rustc_span::def_id::DefId;
use crate::traits::project::{normalize_with_depth, normalize_with_depth_to};
use crate::traits::select::TraitObligationExt;
use crate::traits::util::{self, closure_trait_ref_and_return_type, predicate_for_trait_def};
use crate::traits::{
BuiltinDerivedObligation, DerivedObligationCause, ImplDerivedObligation,
ImplDerivedObligationCause, ImplSource, ImplSourceAutoImplData, ImplSourceBuiltinData,
ImplSourceClosureData, ImplSourceConstDestructData, ImplSourceDiscriminantKindData,
ImplSourceFnPointerData, ImplSourceGeneratorData, ImplSourceObjectData, ImplSourcePointeeData,
ImplSourceTraitAliasData, ImplSourceTraitUpcastingData, ImplSourceUserDefinedData, Normalized,
ObjectCastObligation, Obligation, ObligationCause, OutputTypeParameterMismatch,
PredicateObligation, Selection, SelectionError, TraitNotObjectSafe, TraitObligation,
Unimplemented, VtblSegment,
BuiltinDerivedObligation, ImplDerivedObligation, ImplDerivedObligationCause, ImplSource,
ImplSourceAutoImplData, ImplSourceBuiltinData, ImplSourceClosureData,
ImplSourceConstDestructData, ImplSourceDiscriminantKindData, ImplSourceFnPointerData,
ImplSourceGeneratorData, ImplSourceObjectData, ImplSourcePointeeData, ImplSourceTraitAliasData,
ImplSourceTraitUpcastingData, ImplSourceUserDefinedData, Normalized, ObjectCastObligation,
Obligation, ObligationCause, OutputTypeParameterMismatch, PredicateObligation, Selection,
SelectionError, TraitNotObjectSafe, TraitObligation, Unimplemented, VtblSegment,
};
use super::BuiltinImplConditions;
@@ -1128,21 +1126,13 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
let substs = self.rematch_impl(impl_def_id, &new_obligation);
debug!(?substs, "impl substs");
let derived = DerivedObligationCause {
parent_trait_pred: obligation.predicate,
parent_code: obligation.cause.clone_code(),
};
let derived_code = ImplDerivedObligation(Box::new(ImplDerivedObligationCause {
derived,
impl_def_id,
span: obligation.cause.span,
}));
let cause = ObligationCause::new(
obligation.cause.span,
obligation.cause.body_id,
derived_code,
);
let cause = obligation.derived_cause(|derived| {
ImplDerivedObligation(Box::new(ImplDerivedObligationCause {
derived,
impl_def_id,
span: obligation.cause.span,
}))
});
ensure_sufficient_stack(|| {
self.vtable_impl(
impl_def_id,