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coverage: Simplify counter expressions using simple algebra

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Some of these cases currently don't occur in practice, but are included for
completeness, and to avoid having to add them later as branch coverage and
MC/DC coverage start building more complex expressions.
This commit is contained in:
Zalathar 2024-05-14 13:51:24 +10:00
parent a68bb5e176
commit d01df6f9aa
43 changed files with 845 additions and 1315 deletions
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8
tests/coverage/overflow.cov-map
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@ -27,17 +27,15 @@ Number of file 0 mappings: 9
- Code(Counter(4)) at (prev + 2, 5) to (start + 1, 2)
Function name: overflow::might_overflow
Raw bytes (28): 0x[01, 01, 02, 01, 05, 05, 02, 04, 01, 05, 01, 01, 12, 05, 01, 13, 02, 06, 02, 02, 06, 00, 07, 07, 01, 09, 05, 02]
Raw bytes (26): 0x[01, 01, 01, 01, 05, 04, 01, 05, 01, 01, 12, 05, 01, 13, 02, 06, 02, 02, 06, 00, 07, 01, 01, 09, 05, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 2
Number of expressions: 1
- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
- expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
Number of file 0 mappings: 4
- Code(Counter(0)) at (prev + 5, 1) to (start + 1, 18)
- Code(Counter(1)) at (prev + 1, 19) to (start + 2, 6)
- Code(Expression(0, Sub)) at (prev + 2, 6) to (start + 0, 7)
= (c0 - c1)
- Code(Expression(1, Add)) at (prev + 1, 9) to (start + 5, 2)
= (c1 + (c0 - c1))
- Code(Counter(0)) at (prev + 1, 9) to (start + 5, 2)