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normalize_generic_arg_after in terms of try version

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This commit is contained in:
b-naber 2021-12-08 18:11:13 +01:00
parent 1796de7bb1
commit 8250eef685
1 changed files with 11 additions and 34 deletions
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45
compiler/rustc_traits/src/normalize_erasing_regions.rs
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@ -15,10 +15,19 @@
.perf_stats
.normalize_generic_arg_after_erasing_regions
.fetch_add(1, Ordering::Relaxed);
normalize_after_erasing_regions(tcx, goal)
let (param_env, goal) = goal.into_parts();
tcx.try_normalize_erasing_regions(param_env, goal).unwrap_or_else(|_| bug!(
"Failed to normalize {:?}, maybe try to call `try_normalize_erasing_regions` instead",
goal
))
},
normalize_mir_const_after_erasing_regions: |tcx, goal| {
normalize_after_erasing_regions(tcx, goal)
let (param_env, goal) = goal.into_parts();
tcx.try_normalize_erasing_regions(param_env, goal).unwrap_or_else(|_| bug!(
"Failed to normalize {:?}, maybe try to call `try_normalize_erasing_regions` instead",
goal
))
},
try_normalize_generic_arg_after_erasing_regions: |tcx, goal| {
debug!("try_normalize_generic_arg_after_erasing_regions(goal={:#?}", goal);
@ -32,38 +41,6 @@
};
}
#[instrument(level = "debug", skip(tcx))]
fn normalize_after_erasing_regions<'tcx, T: TypeFoldable<'tcx> + PartialEq + Copy>(
tcx: TyCtxt<'tcx>,
goal: ParamEnvAnd<'tcx, T>,
) -> T {
let ParamEnvAnd { param_env, value } = goal;
tcx.infer_ctxt().enter(|infcx| {
let cause = ObligationCause::dummy();
match infcx.at(&cause, param_env).normalize(value) {
Ok(Normalized { value: normalized_value, obligations: normalized_obligations }) => {
// We don't care about the `obligations`; they are
// always only region relations, and we are about to
// erase those anyway:
debug_assert_eq!(
normalized_obligations.iter().find(|p| not_outlives_predicate(&p.predicate)),
None,
);
let resolved_value = infcx.resolve_vars_if_possible(normalized_value);
// It's unclear when `resolve_vars` would have an effect in a
// fresh `InferCtxt`. If this assert does trigger, it will give
// us a test case.
debug_assert_eq!(normalized_value, resolved_value);
let erased = infcx.tcx.erase_regions(resolved_value);
debug_assert!(!erased.needs_infer(), "{:?}", erased);
erased
}
Err(NoSolution) => bug!("could not fully normalize `{:?}`", value),
}
})
}
#[instrument(level = "debug", skip(tcx))]
fn try_normalize_after_erasing_regions<'tcx, T: TypeFoldable<'tcx> + PartialEq + Copy>(
tcx: TyCtxt<'tcx>,