pub(super) struct CoverageCounters {
    counter_increment_sites: IndexVec<CounterId, CounterIncrementSite>,
    bcb_counters: IndexVec<BasicCoverageBlock, Option<BcbCounter>>,
    bcb_edge_counters: FxHashMap<(BasicCoverageBlock, BasicCoverageBlock), BcbCounter>,
    expressions: IndexVec<ExpressionId, BcbExpression>,
    expressions_memo: FxHashMap<BcbExpression, BcbCounter>,
}
Expand description

Generates and stores coverage counter and coverage expression information associated with nodes/edges in the BCB graph.

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§counter_increment_sites: IndexVec<CounterId, CounterIncrementSite>

List of places where a counter-increment statement should be injected into MIR, each with its corresponding counter ID.

§bcb_counters: IndexVec<BasicCoverageBlock, Option<BcbCounter>>

Coverage counters/expressions that are associated with individual BCBs.

§bcb_edge_counters: FxHashMap<(BasicCoverageBlock, BasicCoverageBlock), BcbCounter>

Coverage counters/expressions that are associated with the control-flow edge between two BCBs.

We currently don’t iterate over this map, but if we do in the future, switch it back to FxIndexMap to avoid query stability hazards.

§expressions: IndexVec<ExpressionId, BcbExpression>

Table of expression data, associating each expression ID with its corresponding operator (+ or -) and its LHS/RHS operands.

§expressions_memo: FxHashMap<BcbExpression, BcbCounter>

Remember expressions that have already been created (or simplified), so that we don’t create unnecessary duplicates.

Implementations§

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impl CoverageCounters

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pub(super) fn make_bcb_counters( basic_coverage_blocks: &CoverageGraph, bcb_has_coverage_spans: impl Fn(BasicCoverageBlock) -> bool ) -> Self

Makes BcbCounter Counters and Expressions for the BasicCoverageBlocks directly or indirectly associated with coverage spans, and accumulates additional Expressions representing intermediate values.

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fn make_counter(&mut self, site: CounterIncrementSite) -> BcbCounter

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fn make_expression( &mut self, lhs: BcbCounter, op: Op, rhs: BcbCounter ) -> BcbCounter

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fn make_expression_inner( expressions: &mut IndexVec<ExpressionId, BcbExpression>, new_expr: BcbExpression ) -> BcbCounter

This is an associated function so that we can call it while borrowing &mut self.expressions_memo.

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fn make_sum_expression( &mut self, lhs: Option<BcbCounter>, rhs: BcbCounter ) -> BcbCounter

Variant of make_expression that makes lhs optional and assumes Op::Add.

This is useful when using Iterator::fold to build an arbitrary-length sum.

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pub(super) fn num_counters(&self) -> usize

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

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

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pub(super) fn bcb_counter(&self, bcb: BasicCoverageBlock) -> Option<BcbCounter>

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pub(super) fn counter_increment_sites( &self ) -> impl Iterator<Item = (CounterId, &CounterIncrementSite)>

Returns an iterator over all the nodes/edges in the coverage graph that should have a counter-increment statement injected into MIR, along with each site’s corresponding counter ID.

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pub(super) fn bcb_nodes_with_coverage_expressions( &self ) -> impl Iterator<Item = (BasicCoverageBlock, ExpressionId)> + Captures<'_>

Returns an iterator over the subset of BCB nodes that have been associated with a counter expression, along with the ID of that expression.

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pub(super) fn into_expressions(self) -> IndexVec<ExpressionId, Expression>

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Size: 136 bytes