Struct rustc_mir_dataflow::impls::EverInitializedPlaces
source · [−]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
sourceimpl<'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
sourceimpl<'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.
sourceconst NAME: &'static str = "ever_init"
const NAME: &'static str = "ever_init"
A descriptive name for this analysis. Used only for debugging. Read more
sourcefn 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.
sourcefn initialize_start_block(&self, body: &Body<'tcx>, state: &mut Self::Domain)
fn initialize_start_block(&self, body: &Body<'tcx>, state: &mut Self::Domain)
Mutates the initial value of the dataflow state upon entry to the
START_BLOCK
. Read moresourceimpl<'tcx> GenKillAnalysis<'tcx> for EverInitializedPlaces<'_, 'tcx>
impl<'tcx> GenKillAnalysis<'tcx> for EverInitializedPlaces<'_, 'tcx>
type Idx = InitIndex
sourcefn statement_effect(
&self,
trans: &mut impl GenKill<Self::Idx>,
stmt: &Statement<'tcx>,
location: Location
)
fn statement_effect(
&self,
trans: &mut impl GenKill<Self::Idx>,
stmt: &Statement<'tcx>,
location: Location
)
See
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
)
See
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>
)
See
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
)
See
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
)
See
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>
)
See
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>
)
See
Analysis::apply_switch_int_edge_effects
.sourceimpl<'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>where
'tcx: 'a,
impl<'a, 'tcx> !UnwindSafe for EverInitializedPlaces<'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
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