pub struct DefinitelyInitializedPlaces<'a, 'tcx> {
tcx: TyCtxt<'tcx>,
body: &'a Body<'tcx>,
mdpe: &'a MoveDataParamEnv<'tcx>,
}
Expand description
DefinitelyInitializedPlaces
tracks all places that are definitely
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) { // definite-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}
} // { }
c = S; // { c }
}
To determine whether a place may be uninitialized at a particular control-flow point, one can take the set-complement of this data.
Similarly, at a given drop
statement, the set-difference between
this data and MaybeInitializedPlaces
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>
Implementations§
source§impl<'a, 'tcx> DefinitelyInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> DefinitelyInitializedPlaces<'a, 'tcx>
pub fn new( tcx: TyCtxt<'tcx>, body: &'a Body<'tcx>, mdpe: &'a MoveDataParamEnv<'tcx> ) -> Self
source§impl<'a, 'tcx> DefinitelyInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> DefinitelyInitializedPlaces<'a, 'tcx>
fn update_bits( trans: &mut impl GenKill<MovePathIndex>, path: MovePathIndex, state: DropFlagState )
Trait Implementations§
source§impl<'a, 'tcx> AnalysisDomain<'tcx> for DefinitelyInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> AnalysisDomain<'tcx> for DefinitelyInitializedPlaces<'a, 'tcx>
§type Domain = Dual<BitSet<MovePathIndex>>
type Domain = Dual<BitSet<MovePathIndex>>
Use set intersection as the join operator.
source§const NAME: &'static str = "definite_init"
const NAME: &'static str = "definite_init"
source§fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain
fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain
source§impl<'tcx> GenKillAnalysis<'tcx> for DefinitelyInitializedPlaces<'_, 'tcx>
impl<'tcx> GenKillAnalysis<'tcx> for DefinitelyInitializedPlaces<'_, '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,
trans: &mut Self::Domain,
terminator: &'mir Terminator<'tcx>,
location: Location
) -> TerminatorEdges<'mir, 'tcx>
fn terminator_effect<'mir>( &mut self, trans: &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 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§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§impl<'a, 'tcx> HasMoveData<'tcx> for DefinitelyInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> HasMoveData<'tcx> for DefinitelyInitializedPlaces<'a, 'tcx>
Auto Trait Implementations§
impl<'a, 'tcx> !RefUnwindSafe for DefinitelyInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !Send for DefinitelyInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !Sync for DefinitelyInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> Unpin for DefinitelyInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !UnwindSafe for DefinitelyInitializedPlaces<'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: 24 bytes