Struct rustc_mir_dataflow::impls::MaybeInitializedPlaces
source · pub struct MaybeInitializedPlaces<'a, 'tcx> {
tcx: TyCtxt<'tcx>,
body: &'a Body<'tcx>,
mdpe: &'a MoveDataParamEnv<'tcx>,
skip_unreachable_unwind: bool,
}
Expand description
MaybeInitializedPlaces
tracks all places that might be
initialized upon reaching a particular point in the control flow
for a function.
For example, in code like the following, we have corresponding dataflow information shown in the right-hand comments.
struct S;
fn foo(pred: bool) { // maybe-init:
// {}
let a = S; let mut b = S; let c; let d; // {a, b}
if pred {
drop(a); // { b}
b = S; // { b}
} else {
drop(b); // {a}
d = S; // {a, d}
} // {a, b, d}
c = S; // {a, b, c, d}
}
To determine whether a place must be initialized at a
particular control-flow point, one can take the set-difference
between this data and the data from MaybeUninitializedPlaces
at the
corresponding control-flow point.
Similarly, at a given drop
statement, the set-intersection
between this data and MaybeUninitializedPlaces
yields the set of
places that would require a dynamic drop-flag at that statement.
Fields§
§tcx: TyCtxt<'tcx>
§body: &'a Body<'tcx>
§mdpe: &'a MoveDataParamEnv<'tcx>
§skip_unreachable_unwind: bool
Implementations§
source§impl<'a, 'tcx> MaybeInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> MaybeInitializedPlaces<'a, 'tcx>
pub fn new( tcx: TyCtxt<'tcx>, body: &'a Body<'tcx>, mdpe: &'a MoveDataParamEnv<'tcx> ) -> Self
pub fn skipping_unreachable_unwind(self) -> Self
pub fn is_unwind_dead( &self, place: Place<'tcx>, state: &MaybeReachable<ChunkedBitSet<MovePathIndex>> ) -> bool
source§impl<'a, 'tcx> MaybeInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> MaybeInitializedPlaces<'a, 'tcx>
fn update_bits( trans: &mut impl GenKill<MovePathIndex>, path: MovePathIndex, state: DropFlagState )
Trait Implementations§
source§impl<'tcx> AnalysisDomain<'tcx> for MaybeInitializedPlaces<'_, 'tcx>
impl<'tcx> AnalysisDomain<'tcx> for MaybeInitializedPlaces<'_, 'tcx>
§type Domain = MaybeReachable<ChunkedBitSet<MovePathIndex>>
type Domain = MaybeReachable<ChunkedBitSet<MovePathIndex>>
source§const NAME: &'static str = "maybe_init"
const NAME: &'static str = "maybe_init"
source§fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain
fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain
source§impl<'tcx> GenKillAnalysis<'tcx> for MaybeInitializedPlaces<'_, 'tcx>
impl<'tcx> GenKillAnalysis<'tcx> for MaybeInitializedPlaces<'_, 'tcx>
type Idx = MovePathIndex
fn domain_size(&self, _: &Body<'tcx>) -> usize
source§fn statement_effect(
&mut self,
trans: &mut impl GenKill<Self::Idx>,
statement: &Statement<'tcx>,
location: Location
)
fn statement_effect( &mut self, trans: &mut impl GenKill<Self::Idx>, statement: &Statement<'tcx>, location: Location )
Analysis::apply_statement_effect
.source§fn terminator_effect<'mir>(
&mut self,
state: &mut Self::Domain,
terminator: &'mir Terminator<'tcx>,
location: Location
) -> TerminatorEdges<'mir, 'tcx>
fn terminator_effect<'mir>( &mut self, state: &mut Self::Domain, terminator: &'mir Terminator<'tcx>, location: Location ) -> TerminatorEdges<'mir, 'tcx>
Analysis::apply_terminator_effect
.source§fn call_return_effect(
&mut self,
trans: &mut impl GenKill<Self::Idx>,
_block: BasicBlock,
return_places: CallReturnPlaces<'_, 'tcx>
)
fn call_return_effect( &mut self, trans: &mut impl GenKill<Self::Idx>, _block: BasicBlock, return_places: CallReturnPlaces<'_, 'tcx> )
Analysis::apply_call_return_effect
.source§fn switch_int_edge_effects<G: GenKill<Self::Idx>>(
&mut self,
block: BasicBlock,
discr: &Operand<'tcx>,
edge_effects: &mut impl SwitchIntEdgeEffects<G>
)
fn switch_int_edge_effects<G: GenKill<Self::Idx>>( &mut self, block: BasicBlock, discr: &Operand<'tcx>, edge_effects: &mut impl SwitchIntEdgeEffects<G> )
Analysis::apply_switch_int_edge_effects
.source§fn before_statement_effect(
&mut self,
_trans: &mut impl GenKill<Self::Idx>,
_statement: &Statement<'tcx>,
_location: Location
)
fn before_statement_effect( &mut self, _trans: &mut impl GenKill<Self::Idx>, _statement: &Statement<'tcx>, _location: Location )
Analysis::apply_before_statement_effect
.source§fn before_terminator_effect(
&mut self,
_trans: &mut impl GenKill<Self::Idx>,
_terminator: &Terminator<'tcx>,
_location: Location
)
fn before_terminator_effect( &mut self, _trans: &mut impl GenKill<Self::Idx>, _terminator: &Terminator<'tcx>, _location: Location )
Analysis::apply_before_terminator_effect
.source§impl<'a, 'tcx> HasMoveData<'tcx> for MaybeInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> HasMoveData<'tcx> for MaybeInitializedPlaces<'a, 'tcx>
Auto Trait Implementations§
impl<'a, 'tcx> !RefUnwindSafe for MaybeInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !Send for MaybeInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !Sync for MaybeInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> Unpin for MaybeInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !UnwindSafe for MaybeInitializedPlaces<'a, 'tcx>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<'tcx, A, D> RustcPeekAt<'tcx> for Awhere
A: Analysis<'tcx, Domain = D> + HasMoveData<'tcx>,
D: JoinSemiLattice + Clone + BitSetExt<MovePathIndex>,
impl<'tcx, A, D> RustcPeekAt<'tcx> for Awhere A: Analysis<'tcx, Domain = D> + HasMoveData<'tcx>, D: JoinSemiLattice + Clone + BitSetExt<MovePathIndex>,
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 32 bytes