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cmd/cover: fix sorting of profile segment boundaries

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If a span of coverable code is empty (e.g. an empty select clause)
then there will be two Boundary values with the same offset. In that
case, the starting Boundary needs to come first so that the generated
HTML output will open the <span> tag before it tries to close it.

Change-Id: Ib44a8b7c36ae57757c18b6cceb7a88ffa4e95394
Reviewed-on: https://go-review.googlesource.com/114855
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
David Symonds 2018-05-28 13:03:08 +10:00
parent c1d9d1f305
commit 4fe688c6a4
1 changed files with 5 additions and 2 deletions
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7
src/cmd/cover/profile.go
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@ -174,7 +174,7 @@ func (p *Profile) Boundaries(src []byte) (boundaries []Boundary) {
return b
}
if max <= 1 {
b.Norm = 0.8 // Profile is in"set" mode; we want a heat map. Use cov8 in the CSS.
b.Norm = 0.8 // Profile is in "set" mode; we want a heat map. Use cov8 in the CSS.
} else if count > 0 {
b.Norm = math.Log(float64(count)) / divisor
}
@ -209,7 +209,10 @@ func (b boundariesByPos) Len() int { return len(b) }
func (b boundariesByPos) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
func (b boundariesByPos) Less(i, j int) bool {
if b[i].Offset == b[j].Offset {
return !b[i].Start && b[j].Start
// Boundaries at the same offset should be ordered Start < !Start.
// They represent empty sections of code (e.g. a switch/select clause
// without a body).
return b[i].Start && !b[j].Start
}
return b[i].Offset < b[j].Offset
}