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internal/fuzz: minimization should not reduce coverage

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Minimization should result in a fuzz input which
includes the same coverage bits as the original
input.

Updates #48326

Change-Id: I6c5f30058b57ccd1a096ad0e9452a4dfbb7d9aab
Reviewed-on: https://go-review.googlesource.com/c/go/+/391454
Trust: Bryan Mills <bcmills@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
Auto-Submit: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Steven Johnstone 2022-03-10 13:38:00 +00:00 • committed by Gopher Robot
parent bd71dee2b4
commit 5003ed884a
3 changed files with 13 additions and 12 deletions
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11
src/internal/fuzz/coverage.go
View file

@ -66,6 +66,17 @@ func countNewCoverageBits(base, snapshot []byte) int {
return n
}
// isCoverageSubset returns true if all the base coverage bits are set in
// snapshot
func isCoverageSubset(base, snapshot []byte) bool {
for i, v := range base {
if v&snapshot[i] != v {
return false
}
}
return true
}
// hasCoverageBit returns true if snapshot has at least one bit set that is
// also set in base.
func hasCoverageBit(base, snapshot []byte) bool {