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Remove on_all_drop_children_bits.

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As drop elaboration only tracks places that need dropping, is has become
equivalent to `on_all_children_bits`.
This commit is contained in:
Camille GILLOT 2023-10-01 08:47:12 +00:00
parent c9c0c0cbca
commit 547af00019
4 changed files with 18 additions and 36 deletions
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23
compiler/rustc_mir_dataflow/src/drop_flag_effects.rs
View File

@ -75,29 +75,6 @@ pub fn on_all_children_bits<'tcx, F>(
on_all_children_bits(tcx, body, move_data, move_path_index, &mut each_child);
}
pub fn on_all_drop_children_bits<'tcx, F>(
tcx: TyCtxt<'tcx>,
body: &Body<'tcx>,
ctxt: &MoveDataParamEnv<'tcx>,
path: MovePathIndex,
mut each_child: F,
) where
F: FnMut(MovePathIndex),
{
on_all_children_bits(tcx, body, &ctxt.move_data, path, |child| {
let place = &ctxt.move_data.move_paths[path].place;
let ty = place.ty(body, tcx).ty;
debug!("on_all_drop_children_bits({:?}, {:?} : {:?})", path, place, ty);
let erased_ty = tcx.erase_regions(ty);
if erased_ty.needs_drop(tcx, ctxt.param_env) {
each_child(child);
} else {
debug!("on_all_drop_children_bits - skipping")
}
})
}
pub fn drop_flag_effects_for_function_entry<'tcx, F>(
tcx: TyCtxt<'tcx>,
body: &Body<'tcx>,

4
compiler/rustc_mir_dataflow/src/impls/initialized.rs
View File

@ -10,7 +10,7 @@ use crate::framework::SwitchIntEdgeEffects;
use crate::move_paths::{HasMoveData, InitIndex, InitKind, LookupResult, MoveData, MovePathIndex};
use crate::on_lookup_result_bits;
use crate::MoveDataParamEnv;
use crate::{drop_flag_effects, on_all_children_bits, on_all_drop_children_bits};
use crate::{drop_flag_effects, on_all_children_bits};
use crate::{lattice, AnalysisDomain, GenKill, GenKillAnalysis, MaybeReachable};
/// `MaybeInitializedPlaces` tracks all places that might be
@ -72,7 +72,7 @@ impl<'a, 'tcx> MaybeInitializedPlaces<'a, 'tcx> {
) -> bool {
if let LookupResult::Exact(path) = self.move_data().rev_lookup.find(place.as_ref()) {
let mut maybe_live = false;
on_all_drop_children_bits(self.tcx, self.body, self.mdpe, path, |child| {
on_all_children_bits(self.tcx, self.body, self.move_data(), path, |child| {
maybe_live |= state.contains(child);
});
!maybe_live

3
compiler/rustc_mir_dataflow/src/lib.rs
View File

@ -23,8 +23,7 @@ use rustc_span::symbol::{sym, Symbol};
pub use self::drop_flag_effects::{
drop_flag_effects_for_function_entry, drop_flag_effects_for_location,
move_path_children_matching, on_all_children_bits, on_all_drop_children_bits,
on_lookup_result_bits,
move_path_children_matching, on_all_children_bits, on_lookup_result_bits,
};
pub use self::framework::{
fmt, graphviz, lattice, visit_results, Analysis, AnalysisDomain, AnalysisResults, Backward,

24
compiler/rustc_mir_transform/src/elaborate_drops.rs
View File

@ -9,9 +9,9 @@ use rustc_mir_dataflow::elaborate_drops::{elaborate_drop, DropFlagState, Unwind}
use rustc_mir_dataflow::elaborate_drops::{DropElaborator, DropFlagMode, DropStyle};
use rustc_mir_dataflow::impls::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
use rustc_mir_dataflow::move_paths::{LookupResult, MoveData, MovePathIndex};
use rustc_mir_dataflow::on_all_children_bits;
use rustc_mir_dataflow::on_lookup_result_bits;
use rustc_mir_dataflow::MoveDataParamEnv;
use rustc_mir_dataflow::{on_all_children_bits, on_all_drop_children_bits};
use rustc_mir_dataflow::{Analysis, ResultsCursor};
use rustc_span::Span;
use rustc_target::abi::{FieldIdx, VariantIdx};
@ -172,13 +172,19 @@ impl<'a, 'tcx> DropElaborator<'a, 'tcx> for Elaborator<'a, '_, 'tcx> {
let mut some_live = false;
let mut some_dead = false;
let mut children_count = 0;
on_all_drop_children_bits(self.tcx(), self.body(), self.ctxt.env, path, |child| {
let (live, dead) = self.ctxt.init_data.maybe_live_dead(child);
debug!("elaborate_drop: state({:?}) = {:?}", child, (live, dead));
some_live |= live;
some_dead |= dead;
children_count += 1;
});
on_all_children_bits(
self.tcx(),
self.body(),
self.ctxt.move_data(),
path,
|child| {
let (live, dead) = self.ctxt.init_data.maybe_live_dead(child);
debug!("elaborate_drop: state({:?}) = {:?}", child, (live, dead));
some_live |= live;
some_dead |= dead;
children_count += 1;
},
);
((some_live, some_dead), children_count != 1)
}
};
@ -298,7 +304,7 @@ impl<'b, 'tcx> ElaborateDropsCtxt<'b, 'tcx> {
match path {
LookupResult::Exact(path) => {
self.init_data.seek_before(self.body.terminator_loc(bb));
on_all_drop_children_bits(self.tcx, self.body, self.env, path, |child| {
on_all_children_bits(self.tcx, self.body, self.move_data(), path, |child| {
let (maybe_live, maybe_dead) = self.init_data.maybe_live_dead(child);
debug!(
"collect_drop_flags: collecting {:?} from {:?}@{:?} - {:?}",