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This opens the door to collecting and storing coverage information that is
unrelated to branch coverage or MC/DC.
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Condition coverage extends branch coverage to treat the specific case
of last operands of boolean decisions not involved in control flow.
This is ultimately made for MCDC to be exhaustive on all boolean expressions.
This patch adds a call to `visit_branch_coverage_operation` to track the
top-level operand of the said decisions, and changes
`visit_coverage_standalone_condition` so MCDC branch registration is called
when enabled on these _last RHS_ cases.
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When a lazy logical operator (`&&` or `||`) occurs outside of an `if`
condition, it normally doesn't have any associated control-flow branch, so we
don't have an existing way to track whether it was true or false.
This patch adds special code to handle this case, by inserting extra MIR blocks
in a diamond shape after evaluating the RHS. This gives us a place to insert
the appropriate marker statements, which can then be given their own counters.
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Use decision context stack to handle nested decisions:
- Introduce MCDCDecisionCtx
- Use a stack of MCDCDecisionCtx to handle nested decisions
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Add decision_depth field to TVBitmapUpdate/CondBitmapUpdate statements
Add decision_depth field to BcbMappingKinds MCDCBranch and MCDCDecision
Add decision_depth field to MCDCBranchSpan and MCDCDecisionSpan
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MC/DC's reliance on the existing branch coverage types is making it much harder
to improve branch coverage.
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The payload of coverage statements was historically a structure with several
fields, so it was boxed to avoid bloating `StatementKind`.
Now that the payload is a single relatively-small enum, we can replace
`Box<Coverage>` with just `CoverageKind`.
This patch also adds a size assertion for `StatementKind`, to avoid
accidentally bloating it in the future.
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