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Don't store region in CapturedPlace #129987

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Sep 7, 2024
Merged

Don't store region in CapturedPlace #129987

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59 changes: 19 additions & 40 deletions compiler/rustc_hir_typeck/src/upvar.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,6 @@ use rustc_hir as hir;
use rustc_hir::def_id::LocalDefId;
use rustc_hir::intravisit::{self, Visitor};
use rustc_hir::HirId;
use rustc_infer::infer::UpvarRegion;
use rustc_middle::hir::place::{Place, PlaceBase, PlaceWithHirId, Projection, ProjectionKind};
use rustc_middle::mir::FakeReadCause;
use rustc_middle::traits::ObligationCauseCode;
Expand Down Expand Up @@ -425,7 +424,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
self.tcx,
upvar_ty,
capture,
if needs_ref { Some(closure_env_region) } else { child_capture.region },
if needs_ref {
closure_env_region
} else {
self.tcx.lifetimes.re_erased
},
);
},
),
Expand Down Expand Up @@ -587,7 +590,12 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {

debug!(?captured_place.place, ?upvar_ty, ?capture, ?captured_place.mutability);

apply_capture_kind_on_capture_ty(self.tcx, upvar_ty, capture, captured_place.region)
apply_capture_kind_on_capture_ty(
self.tcx,
upvar_ty,
capture,
self.tcx.lifetimes.re_erased,
)
})
.collect()
}
Expand Down Expand Up @@ -775,13 +783,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {

let Some(min_cap_list) = root_var_min_capture_list.get_mut(&var_hir_id) else {
let mutability = self.determine_capture_mutability(&typeck_results, &place);
let min_cap_list = vec![ty::CapturedPlace {
var_ident,
place,
info: capture_info,
mutability,
region: None,
}];
let min_cap_list =
vec![ty::CapturedPlace { var_ident, place, info: capture_info, mutability }];
root_var_min_capture_list.insert(var_hir_id, min_cap_list);
continue;
};
Expand Down Expand Up @@ -874,34 +877,12 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
// Only need to insert when we don't have an ancestor in the existing min capture list
if !ancestor_found {
let mutability = self.determine_capture_mutability(&typeck_results, &place);
let captured_place = ty::CapturedPlace {
var_ident,
place,
info: updated_capture_info,
mutability,
region: None,
};
let captured_place =
ty::CapturedPlace { var_ident, place, info: updated_capture_info, mutability };
min_cap_list.push(captured_place);
}
}

// For each capture that is determined to be captured by ref, add region info.
for (_, captures) in &mut root_var_min_capture_list {
for capture in captures {
match capture.info.capture_kind {
ty::UpvarCapture::ByRef(_) => {
let PlaceBase::Upvar(upvar_id) = capture.place.base else {
bug!("expected upvar")
};
let origin = UpvarRegion(upvar_id, closure_span);
let upvar_region = self.next_region_var(origin);
capture.region = Some(upvar_region);
}
_ => (),
}
}
}

debug!(
"For closure={:?}, min_captures before sorting={:?}",
closure_def_id, root_var_min_capture_list
Expand Down Expand Up @@ -1195,7 +1176,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
self.tcx,
ty,
max_capture_info.capture_kind,
Some(self.tcx.lifetimes.re_erased),
self.tcx.lifetimes.re_erased,
)
}
};
Expand All @@ -1217,7 +1198,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
self.tcx,
capture.place.ty(),
capture.info.capture_kind,
Some(self.tcx.lifetimes.re_erased),
self.tcx.lifetimes.re_erased,
);

// Checks if a capture implements any of the auto traits
Expand Down Expand Up @@ -1935,13 +1916,11 @@ fn apply_capture_kind_on_capture_ty<'tcx>(
tcx: TyCtxt<'tcx>,
ty: Ty<'tcx>,
capture_kind: UpvarCapture,
region: Option<ty::Region<'tcx>>,
region: ty::Region<'tcx>,
) -> Ty<'tcx> {
match capture_kind {
ty::UpvarCapture::ByValue => ty,
ty::UpvarCapture::ByRef(kind) => {
Ty::new_ref(tcx, region.unwrap(), ty, kind.to_mutbl_lossy())
}
ty::UpvarCapture::ByRef(kind) => Ty::new_ref(tcx, region, ty, kind.to_mutbl_lossy()),
}
}

Expand Down
3 changes: 0 additions & 3 deletions compiler/rustc_middle/src/ty/closure.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -88,9 +88,6 @@ pub struct CapturedPlace<'tcx> {

/// Represents if `place` can be mutated or not.
pub mutability: hir::Mutability,

/// Region of the resulting reference if the upvar is captured by ref.
pub region: Option<ty::Region<'tcx>>,
}

impl<'tcx> CapturedPlace<'tcx> {
Expand Down
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