bjoernager/rust
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Cache dominators.

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This commit is contained in:
Camille GILLOT 2023-05-04 16:26:09 +00:00
parent aa1267f630
commit 6f271dc49c
6 changed files with 19 additions and 19 deletions
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13
compiler/rustc_borrowck/src/lib.rs
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@ -43,7 +43,6 @@ use rustc_target::abi::FieldIdx;
use either::Either;
use smallvec::SmallVec;
use std::cell::OnceCell;
use std::cell::RefCell;
use std::collections::BTreeMap;
use std::ops::Deref;
@ -331,7 +330,7 @@ fn do_mir_borrowck<'tcx>(
used_mut: Default::default(),
used_mut_upvars: SmallVec::new(),
borrow_set: Rc::clone(&borrow_set),
dominators: Default::default(),
dominators: promoted_body.basic_blocks.dominators(),
upvars: Vec::new(),
local_names: IndexVec::from_elem(None, &promoted_body.local_decls),
region_names: RefCell::default(),
@ -360,7 +359,7 @@ fn do_mir_borrowck<'tcx>(
used_mut: Default::default(),
used_mut_upvars: SmallVec::new(),
borrow_set: Rc::clone(&borrow_set),
dominators: Default::default(),
dominators: body.basic_blocks.dominators(),
upvars,
local_names,
region_names: RefCell::default(),
@ -592,7 +591,7 @@ struct MirBorrowckCtxt<'cx, 'tcx> {
borrow_set: Rc<BorrowSet<'tcx>>,
/// Dominators for MIR
dominators: OnceCell<Dominators<BasicBlock>>,
dominators: &'cx Dominators<BasicBlock>,
/// Information about upvars not necessarily preserved in types or MIR
upvars: Vec<Upvar<'tcx>>,
@ -1103,7 +1102,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
(Read(kind), BorrowKind::Unique | BorrowKind::Mut { .. }) => {
// Reading from mere reservations of mutable-borrows is OK.
if !is_active(this.dominators(), borrow, location) {
if !is_active(this.dominators, borrow, location) {
assert!(allow_two_phase_borrow(borrow.kind));
return Control::Continue;
}
@ -2267,10 +2266,6 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
fn is_upvar_field_projection(&self, place_ref: PlaceRef<'tcx>) -> Option<FieldIdx> {
path_utils::is_upvar_field_projection(self.infcx.tcx, &self.upvars, place_ref, self.body())
}
fn dominators(&self) -> &Dominators<BasicBlock> {
self.dominators.get_or_init(|| self.body.basic_blocks.dominators())
}
}
mod error {