pub struct ScopedReachabilityConstraintId(/* private fields */);Expand description
A ternary formula that defines under what conditions a binding is visible. (A ternary formula
is just like a boolean formula, but with Ambiguous as a third potential result. See the
module documentation for more details.)
The primitive atoms of the formula are super::predicate::Predicates, which express some
property of the runtime state of the code that we are analyzing.
We assume that each atom has a stable value each time that the formula is evaluated. An atom
that resolves to Ambiguous might be true or false, and we can’t tell which — but within that
evaluation, we assume that the atom has the same unknown value each time it appears. That
allows us to perform simplifications like A ∨ !A → true and A ∧ !A → false.
That means that when you are constructing a formula, you might need to create distinct atoms
for a particular super::predicate::Predicate, if your formula needs to consider how a
particular runtime property might be different at different points in the execution of the
program.
reachability constraints are normalized, so equivalent constraints are guaranteed to have equal IDs.
Implementations§
Source§impl ScopedReachabilityConstraintId
impl ScopedReachabilityConstraintId
Sourcepub const ALWAYS_TRUE: ScopedReachabilityConstraintId
pub const ALWAYS_TRUE: ScopedReachabilityConstraintId
A special ID that is used for an “always true” / “always visible” constraint.
Sourcepub const AMBIGUOUS: ScopedReachabilityConstraintId
pub const AMBIGUOUS: ScopedReachabilityConstraintId
A special ID that is used for an ambiguous constraint.
Sourcepub const ALWAYS_FALSE: ScopedReachabilityConstraintId
pub const ALWAYS_FALSE: ScopedReachabilityConstraintId
A special ID that is used for an “always false” / “never visible” constraint.
Trait Implementations§
Source§impl Clone for ScopedReachabilityConstraintId
impl Clone for ScopedReachabilityConstraintId
Source§fn clone(&self) -> ScopedReachabilityConstraintId
fn clone(&self) -> ScopedReachabilityConstraintId
Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source. Read moreimpl Copy for ScopedReachabilityConstraintId
impl Eq for ScopedReachabilityConstraintId
Source§impl GetSize for ScopedReachabilityConstraintId
impl GetSize for ScopedReachabilityConstraintId
Source§fn get_heap_size(&self) -> usize
fn get_heap_size(&self) -> usize
Determines how many bytes this object occupies inside the heap. Read more
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tracker: TRACKER,
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Determines how many bytes this object occupies inside the heap while using a
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fn get_stack_size() -> usize
Determines how may bytes this object occupies inside the stack. Read more
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fn get_size_with_tracker<T>(&self, tracker: T) -> (usize, T)where
T: GetSizeTracker,
Determines the total size of the object while using a
tracker. Read moreSource§impl Idx for ScopedReachabilityConstraintId
impl Idx for ScopedReachabilityConstraintId
impl StructuralPartialEq for ScopedReachabilityConstraintId
Auto Trait Implementations§
impl Freeze for ScopedReachabilityConstraintId
impl RefUnwindSafe for ScopedReachabilityConstraintId
impl Send for ScopedReachabilityConstraintId
impl Sync for ScopedReachabilityConstraintId
impl Unpin for ScopedReachabilityConstraintId
impl UnsafeUnpin for ScopedReachabilityConstraintId
impl UnwindSafe for ScopedReachabilityConstraintId
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