Struct rustc_mir_transform::coverage::graph::CoverageGraph

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pub(crate) struct CoverageGraph {
    bcbs: IndexVec<BasicCoverageBlock, BasicCoverageBlockData>,
    bb_to_bcb: IndexVec<BasicBlock, Option<BasicCoverageBlock>>,
    pub(crate) successors: IndexVec<BasicCoverageBlock, Vec<BasicCoverageBlock>>,
    pub(crate) predecessors: IndexVec<BasicCoverageBlock, Vec<BasicCoverageBlock>>,
    dominators: Option<Dominators<BasicCoverageBlock>>,
}
Expand description

A coverage-specific simplification of the MIR control flow graph (CFG). The CoverageGraphs nodes are BasicCoverageBlocks, which encompass one or more MIR BasicBlocks.

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§bcbs: IndexVec<BasicCoverageBlock, BasicCoverageBlockData>§bb_to_bcb: IndexVec<BasicBlock, Option<BasicCoverageBlock>>§successors: IndexVec<BasicCoverageBlock, Vec<BasicCoverageBlock>>§predecessors: IndexVec<BasicCoverageBlock, Vec<BasicCoverageBlock>>§dominators: Option<Dominators<BasicCoverageBlock>>

Implementations§

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impl CoverageGraph

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pub(crate) fn from_mir(mir_body: &Body<'_>) -> Self

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fn compute_basic_coverage_blocks( mir_body: &Body<'_>, ) -> (IndexVec<BasicCoverageBlock, BasicCoverageBlockData>, IndexVec<BasicBlock, Option<BasicCoverageBlock>>)

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pub(crate) fn iter_enumerated( &self, ) -> impl Iterator<Item = (BasicCoverageBlock, &BasicCoverageBlockData)>

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pub(crate) fn bcb_from_bb(&self, bb: BasicBlock) -> Option<BasicCoverageBlock>

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pub(crate) fn dominates( &self, dom: BasicCoverageBlock, node: BasicCoverageBlock, ) -> bool

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pub(crate) fn cmp_in_dominator_order( &self, a: BasicCoverageBlock, b: BasicCoverageBlock, ) -> Ordering

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pub(crate) fn bcb_has_multiple_in_edges(&self, bcb: BasicCoverageBlock) -> bool

Returns true if the given node has 2 or more in-edges, i.e. 2 or more predecessors.

This property is interesting to code that assigns counters to nodes and edges, because if a node doesn’t have multiple in-edges, then there’s no benefit in having a separate counter for its in-edge, because it would have the same value as the node’s own counter.

FIXME: That assumption might not be true for TerminatorKind::Yield?

Trait Implementations§

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impl Debug for CoverageGraph

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

Formats the value using the given formatter. Read more
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impl DirectedGraph for CoverageGraph

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impl Index<BasicCoverageBlock> for CoverageGraph

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type Output = BasicCoverageBlockData

The returned type after indexing.
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fn index(&self, index: BasicCoverageBlock) -> &BasicCoverageBlockData

Performs the indexing (container[index]) operation. Read more
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impl IndexMut<BasicCoverageBlock> for CoverageGraph

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fn index_mut( &mut self, index: BasicCoverageBlock, ) -> &mut BasicCoverageBlockData

Performs the mutable indexing (container[index]) operation. Read more
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impl Predecessors for CoverageGraph

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fn predecessors(&self, node: Self::Node) -> impl Iterator<Item = Self::Node>

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impl StartNode for CoverageGraph

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fn start_node(&self) -> Self::Node

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impl Successors for CoverageGraph

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fn successors(&self, node: Self::Node) -> impl Iterator<Item = Self::Node>

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Size: 168 bytes