pub struct EverInitializedPlaces<'a, 'tcx> {
tcx: TyCtxt<'tcx>,
body: &'a Body<'tcx>,
mdpe: &'a MoveDataParamEnv<'tcx>,
}
Expand description
EverInitializedPlaces
tracks all places that might have ever been
initialized upon reaching a particular point in the control flow
for a function, without an intervening StorageDead
.
This dataflow is used to determine if an immutable local variable may be assigned to.
For example, in code like the following, we have corresponding dataflow information shown in the right-hand comments.
struct S;
fn foo(pred: bool) { // ever-init:
// { }
let a = S; let mut b = S; let c; let d; // {a, b }
if pred {
drop(a); // {a, b, }
b = S; // {a, b, }
} else {
drop(b); // {a, b, }
d = S; // {a, b, d }
} // {a, b, d }
c = S; // {a, b, c, d }
}
Fields§
§tcx: TyCtxt<'tcx>
§body: &'a Body<'tcx>
§mdpe: &'a MoveDataParamEnv<'tcx>
Implementations§
source§impl<'a, 'tcx> EverInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> EverInitializedPlaces<'a, 'tcx>
pub fn new( tcx: TyCtxt<'tcx>, body: &'a Body<'tcx>, mdpe: &'a MoveDataParamEnv<'tcx> ) -> Self
Trait Implementations§
source§impl<'tcx> AnalysisDomain<'tcx> for EverInitializedPlaces<'_, 'tcx>
impl<'tcx> AnalysisDomain<'tcx> for EverInitializedPlaces<'_, 'tcx>
§type Domain = ChunkedBitSet<InitIndex>
type Domain = ChunkedBitSet<InitIndex>
The type that holds the dataflow state at any given point in the program.
source§const NAME: &'static str = "ever_init"
const NAME: &'static str = "ever_init"
A descriptive name for this analysis. Used only for debugging. Read more
source§fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain
fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain
Returns the initial value of the dataflow state upon entry to each basic block.
source§impl<'tcx> GenKillAnalysis<'tcx> for EverInitializedPlaces<'_, 'tcx>
impl<'tcx> GenKillAnalysis<'tcx> for EverInitializedPlaces<'_, 'tcx>
type Idx = InitIndex
fn domain_size(&self, _: &Body<'tcx>) -> usize
source§fn statement_effect(
&mut self,
trans: &mut impl GenKill<Self::Idx>,
stmt: &Statement<'tcx>,
location: Location
)
fn statement_effect( &mut self, trans: &mut impl GenKill<Self::Idx>, stmt: &Statement<'tcx>, location: Location )
See
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>
See
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> )
See
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 )
See
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 )
See
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> )
See
Analysis::apply_switch_int_edge_effects
.source§impl<'a, 'tcx> HasMoveData<'tcx> for EverInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> HasMoveData<'tcx> for EverInitializedPlaces<'a, 'tcx>
Auto Trait Implementations§
impl<'a, 'tcx> !RefUnwindSafe for EverInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !Send for EverInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !Sync for EverInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> Unpin for EverInitializedPlaces<'a, 'tcx>
impl<'a, 'tcx> !UnwindSafe for EverInitializedPlaces<'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
Mutably borrows from an owned value. Read more
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