Struct FunctionCoverageCollector

pub(crate) struct FunctionCoverageCollector<'tcx> {
    function_coverage_info: &'tcx FunctionCoverageInfo,
    is_used: bool,
    counters_seen: BitSet<CounterId>,
    expressions_seen: BitSet<ExpressionId>,
}

Holds all of the coverage mapping data associated with a function instance, collected during traversal of Coverage statements in the function’s MIR.

Fields

function_coverage_info: &'tcx FunctionCoverageInfo

Coverage info that was attached to this function by the instrumentor.

is_used: bool

counters_seen: BitSet<CounterId>

Tracks which counters have been seen, so that we can identify mappings to counters that were optimized out, and set them to zero.

expressions_seen: BitSet<ExpressionId>

Contains all expression IDs that have been seen in an ExpressionUsed coverage statement, plus all expression IDs that aren’t directly used by any mappings (and therefore do not have expression-used statements). After MIR traversal is finished, we can conclude that any IDs missing from this set must have had their statements deleted by MIR opts.

Implementations

impl<'tcx> FunctionCoverageCollector<'tcx>

pub(crate) fn new( instance: Instance<'tcx>, function_coverage_info: &'tcx FunctionCoverageInfo, ) -> Self

Creates a new set of coverage data for a used (called) function.

pub(crate) fn unused( instance: Instance<'tcx>, function_coverage_info: &'tcx FunctionCoverageInfo, ) -> Self

Creates a new set of coverage data for an unused (never called) function.

fn create( instance: Instance<'tcx>, function_coverage_info: &'tcx FunctionCoverageInfo, is_used: bool, ) -> Self

pub(crate) fn mark_counter_id_seen(&mut self, id: CounterId)

Marks a counter ID as having been seen in a counter-increment statement.

pub(crate) fn mark_expression_id_seen(&mut self, id: ExpressionId)

Marks an expression ID as having been seen in an expression-used statement.

fn identify_zero_expressions(&self) -> ZeroExpressions

Identify expressions that will always have a value of zero, and note their IDs in ZeroExpressions. Mappings that refer to a zero expression can instead become mappings to a constant zero value.

This method mainly exists to preserve the simplifications that were already being performed by the Rust-side expression renumbering, so that the resulting coverage mappings don’t get worse.

pub(crate) fn into_finished(self) -> FunctionCoverage<'tcx>

Trait Implementations

impl<'tcx> Debug for FunctionCoverageCollector<'tcx>

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

Formats the value using the given formatter.

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: 80 bytes