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>

source

pub fn new(
    tcx: TyCtxt<'tcx>,
    body: &'a Body<'tcx>,
    mdpe: &'a MoveDataParamEnv<'tcx>
) -> Self

source§

impl<'a, 'tcx> DefinitelyInitializedPlaces<'a, 'tcx>

source

fn update_bits(
    trans: &mut impl GenKill<MovePathIndex>,
    path: MovePathIndex,
    state: DropFlagState
)

Trait Implementations§

source§

impl<'a, 'tcx> AnalysisDomain<'tcx> for DefinitelyInitializedPlaces<'a, 'tcx>

§

type Domain = Dual<BitSet<MovePathIndex>>

Use set intersection as the join operator.

source§

const NAME: &'static str = "definite_init"

A descriptive name for this analysis. Used only for debugging. Read more
source§

fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain

Returns the initial value of the dataflow state upon entry to each basic block.
source§

fn initialize_start_block(&self, _: &Body<'tcx>, state: &mut Self::Domain)

Mutates the initial value of the dataflow state upon entry to the START_BLOCK. Read more
§

type Direction = Forward

The direction of this analysis. Either Forward or Backward.
source§

impl<'tcx> GenKillAnalysis<'tcx> for DefinitelyInitializedPlaces<'_, 'tcx>

§

type Idx = MovePathIndex

source§

fn statement_effect(
    &self,
    trans: &mut impl GenKill<Self::Idx>,
    _statement: &Statement<'tcx>,
    location: Location
)

See Analysis::apply_statement_effect.
source§

fn terminator_effect(
    &self,
    trans: &mut impl GenKill<Self::Idx>,
    _terminator: &Terminator<'tcx>,
    location: Location
)

See Analysis::apply_terminator_effect.
source§

fn call_return_effect(
    &self,
    trans: &mut impl GenKill<Self::Idx>,
    _block: BasicBlock,
    return_places: CallReturnPlaces<'_, 'tcx>
)

See Analysis::apply_call_return_effect.
source§

fn before_statement_effect(
    &self,
    _trans: &mut impl GenKill<Self::Idx>,
    _statement: &Statement<'tcx>,
    _location: Location
)

See Analysis::apply_before_statement_effect.
source§

fn before_terminator_effect(
    &self,
    _trans: &mut impl GenKill<Self::Idx>,
    _terminator: &Terminator<'tcx>,
    _location: Location
)

See Analysis::apply_before_terminator_effect.
source§

fn yield_resume_effect(
    &self,
    _trans: &mut impl GenKill<Self::Idx>,
    _resume_block: BasicBlock,
    _resume_place: Place<'tcx>
)

See Analysis::apply_yield_resume_effect.
source§

fn switch_int_edge_effects<G: GenKill<Self::Idx>>(
    &self,
    _block: BasicBlock,
    _discr: &Operand<'tcx>,
    _edge_effects: &mut impl SwitchIntEdgeEffects<G>
)

See Analysis::apply_switch_int_edge_effects.
source§

impl<'a, 'tcx> HasMoveData<'tcx> for DefinitelyInitializedPlaces<'a, 'tcx>

source§

fn move_data(&self) -> &MoveData<'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§

source§

impl<T> Any for Twhere
    T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere
    T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere
    T: ?Sized,

const: unstable · source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for Twhere
    U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<'tcx, A, D> RustcPeekAt<'tcx> for Awhere
    A: Analysis<'tcx, Domain = D> + HasMoveData<'tcx>,
    D: JoinSemiLattice + Clone + BitSetExt<MovePathIndex>,

source§

fn peek_at(
    &self,
    tcx: TyCtxt<'tcx>,
    place: Place<'tcx>,
    flow_state: &<A as AnalysisDomain<'tcx>>::Domain,
    call: PeekCall
)

source§

impl<T, U> TryFrom<U> for Twhere
    U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere
    U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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