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
sourceimpl<'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
sourceimpl<'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
sourceimpl<'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.
sourceconst NAME: &'static str = "definite_init"
const NAME: &'static str = "definite_init"
sourcefn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain
fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain
sourcefn initialize_start_block(&self, _: &Body<'tcx>, state: &mut Self::Domain)
fn initialize_start_block(&self, _: &Body<'tcx>, state: &mut Self::Domain)
START_BLOCK
. Read moresourceimpl<'tcx> GenKillAnalysis<'tcx> for DefinitelyInitializedPlaces<'_, 'tcx>
impl<'tcx> GenKillAnalysis<'tcx> for DefinitelyInitializedPlaces<'_, 'tcx>
type Idx = MovePathIndex
sourcefn statement_effect(
&self,
trans: &mut impl GenKill<Self::Idx>,
_statement: &Statement<'tcx>,
location: Location
)
fn statement_effect(
&self,
trans: &mut impl GenKill<Self::Idx>,
_statement: &Statement<'tcx>,
location: Location
)
Analysis::apply_statement_effect
.sourcefn terminator_effect(
&self,
trans: &mut impl GenKill<Self::Idx>,
_terminator: &Terminator<'tcx>,
location: Location
)
fn terminator_effect(
&self,
trans: &mut impl GenKill<Self::Idx>,
_terminator: &Terminator<'tcx>,
location: Location
)
Analysis::apply_terminator_effect
.sourcefn call_return_effect(
&self,
trans: &mut impl GenKill<Self::Idx>,
_block: BasicBlock,
return_places: CallReturnPlaces<'_, 'tcx>
)
fn call_return_effect(
&self,
trans: &mut impl GenKill<Self::Idx>,
_block: BasicBlock,
return_places: CallReturnPlaces<'_, 'tcx>
)
Analysis::apply_call_return_effect
.sourcefn before_statement_effect(
&self,
_trans: &mut impl GenKill<Self::Idx>,
_statement: &Statement<'tcx>,
_location: Location
)
fn before_statement_effect(
&self,
_trans: &mut impl GenKill<Self::Idx>,
_statement: &Statement<'tcx>,
_location: Location
)
Analysis::apply_before_statement_effect
.sourcefn before_terminator_effect(
&self,
_trans: &mut impl GenKill<Self::Idx>,
_terminator: &Terminator<'tcx>,
_location: Location
)
fn before_terminator_effect(
&self,
_trans: &mut impl GenKill<Self::Idx>,
_terminator: &Terminator<'tcx>,
_location: Location
)
Analysis::apply_before_terminator_effect
.sourcefn yield_resume_effect(
&self,
_trans: &mut impl GenKill<Self::Idx>,
_resume_block: BasicBlock,
_resume_place: Place<'tcx>
)
fn yield_resume_effect(
&self,
_trans: &mut impl GenKill<Self::Idx>,
_resume_block: BasicBlock,
_resume_place: Place<'tcx>
)
Analysis::apply_yield_resume_effect
.sourcefn switch_int_edge_effects<G: GenKill<Self::Idx>>(
&self,
_block: BasicBlock,
_discr: &Operand<'tcx>,
_edge_effects: &mut impl SwitchIntEdgeEffects<G>
)
fn switch_int_edge_effects<G: GenKill<Self::Idx>>(
&self,
_block: BasicBlock,
_discr: &Operand<'tcx>,
_edge_effects: &mut impl SwitchIntEdgeEffects<G>
)
Analysis::apply_switch_int_edge_effects
.sourceimpl<'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>where
'tcx: 'a,
impl<'a, 'tcx> !UnwindSafe for DefinitelyInitializedPlaces<'a, 'tcx>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
sourceimpl<'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