Struct CoverageIdsInfo

pub struct CoverageIdsInfo {
    pub counters_seen: DenseBitSet<CounterId>,
    pub zero_expressions: DenseBitSet<ExpressionId>,
}

Summarizes coverage IDs inserted by the InstrumentCoverage MIR pass (for compiler option -Cinstrument-coverage), after MIR optimizations have had a chance to potentially remove some of them.

Used by the coverage_ids_info query.

Fields

counters_seen: DenseBitSet<CounterId>

zero_expressions: DenseBitSet<ExpressionId>

Implementations

impl CoverageIdsInfo

pub fn num_counters_after_mir_opts(&self) -> u32

Coverage codegen needs to know how many coverage counters are ever incremented within a function, so that it can set the num-counters argument of the llvm.instrprof.increment intrinsic.

This may be less than the highest counter ID emitted by the InstrumentCoverage MIR pass, if the highest-numbered counter increments were removed by MIR optimizations.

pub fn is_zero_term(&self, term: CovTerm) -> bool

Returns true if the given term is known to have a value of zero, taking into account knowledge of which counters are unused and which expressions are always zero.

Trait Implementations

impl Clone for CoverageIdsInfo

fn clone(&self) -> CoverageIdsInfo

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CoverageIdsInfo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<__D: TyDecoder> Decodable<__D> for CoverageIdsInfo

fn decode(__decoder: &mut __D) -> Self

impl<__E: TyEncoder> Encodable<__E> for CoverageIdsInfo

fn encode(&self, __encoder: &mut __E)

impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for CoverageIdsInfo

fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher, )

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: 64 bytes