struct MakeBcbCounters<'a> {
    coverage_counters: &'a mut CoverageCounters,
    basic_coverage_blocks: &'a CoverageGraph,
}
Expand description

Traverse the CoverageGraph and add either a Counter or Expression to every BCB, to be injected with coverage spans. Expressions have no runtime overhead, so if a viable expression (adding or subtracting two other counters or expressions) can compute the same result as an embedded counter, an Expression should be used.

Fields§

§coverage_counters: &'a mut CoverageCounters§basic_coverage_blocks: &'a CoverageGraph

Implementations§

source§

impl<'a> MakeBcbCounters<'a>

source

fn new( coverage_counters: &'a mut CoverageCounters, basic_coverage_blocks: &'a CoverageGraph, ) -> Self

source

fn make_bcb_counters( &mut self, bcb_has_coverage_spans: impl Fn(BasicCoverageBlock) -> bool, )

If two BasicCoverageBlocks branch from another BasicCoverageBlock, one of the branches can be counted by Expression by subtracting the other branch from the branching block. Otherwise, the BasicCoverageBlock executed the least should have the Counter. One way to predict which branch executes the least is by considering loops. A loop is exited at a branch, so the branch that jumps to a BasicCoverageBlock outside the loop is almost always executed less than the branch that does not exit the loop.

source

fn make_node_and_branch_counters( &mut self, traversal: &TraverseCoverageGraphWithLoops<'_>, from_bcb: BasicCoverageBlock, )

source

fn get_or_make_counter_operand(&mut self, bcb: BasicCoverageBlock) -> BcbCounter

source

fn get_or_make_edge_counter_operand( &mut self, from_bcb: BasicCoverageBlock, to_bcb: BasicCoverageBlock, ) -> BcbCounter

source

fn choose_preferred_expression_branch( &self, traversal: &TraverseCoverageGraphWithLoops<'_>, from_bcb: BasicCoverageBlock, ) -> BasicCoverageBlock

Select a branch for the expression, either the recommended reloop_branch, or if none was found, select any branch.

source

fn find_good_reloop_branch( &self, traversal: &TraverseCoverageGraphWithLoops<'_>, from_bcb: BasicCoverageBlock, ) -> Option<BasicCoverageBlock>

Tries to find a branch that leads back to the top of a loop, and that doesn’t already have a counter. Such branches are good candidates to be given an expression (instead of a physical counter), because they will tend to be executed more times than a loop-exit branch.

source

fn bcb_predecessors(&self, bcb: BasicCoverageBlock) -> &[BasicCoverageBlock]

source

fn bcb_successors(&self, bcb: BasicCoverageBlock) -> &[BasicCoverageBlock]

source

fn branch_has_no_counter( &self, from_bcb: BasicCoverageBlock, to_bcb: BasicCoverageBlock, ) -> bool

source

fn branch_counter( &self, from_bcb: BasicCoverageBlock, to_bcb: BasicCoverageBlock, ) -> Option<&BcbCounter>

Auto Trait Implementations§

§

impl<'a> Freeze for MakeBcbCounters<'a>

§

impl<'a> RefUnwindSafe for MakeBcbCounters<'a>

§

impl<'a> Send for MakeBcbCounters<'a>

§

impl<'a> Sync for MakeBcbCounters<'a>

§

impl<'a> Unpin for MakeBcbCounters<'a>

§

impl<'a> !UnwindSafe for MakeBcbCounters<'a>

Blanket Implementations§

source§

impl<T> Aligned for T

source§

const ALIGN: Alignment = _

Alignment of Self.
source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

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

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

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

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T, R> CollectAndApply<T, R> for T

source§

fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

source§

type Output = R

source§

impl<T> Filterable for T

source§

fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> Instrument for T

source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
source§

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

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<T> IntoEither for T

source§

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
source§

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
source§

impl<P> IntoQueryParam<P> for P

source§

impl<T> MaybeResult<T> for T

source§

type Error = !

source§

fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

source§

fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

source§

impl<T> Same for T

source§

type Output = T

Should always be Self
source§

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

source§

type Error = Infallible

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

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

source§

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

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

source§

fn upcast(self, interner: I) -> U

source§

impl<I, T> UpcastFrom<I, T> for T

source§

fn upcast_from(from: T, _tcx: I) -> T

source§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

source§

fn vzip(self) -> V

source§

impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

source§

default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

source§

impl<T> WithSubscriber for T

source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
source§

impl<'a, T> Captures<'a> for T
where T: ?Sized,

source§

impl<'a, T> Captures<'a> for T
where T: ?Sized,

source§

impl<T> ErasedDestructor for T
where T: 'static,

source§

impl<T> MaybeSendSync for T

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: 16 bytes