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runtime: add bmap.setoverflow

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bmap already has a overflow (getter) method.
Add a setoverflow (setter) method, for readability.

Updates #19931
Updates #19992

Change-Id: I00b3d94037c0d75508a7ebd51085c5c3857fb764
Reviewed-on: https://go-review.googlesource.com/40977
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-04-16 06:27:24 -07:00
parent a41b1d5052
commit 17d497feaa
1 changed files with 5 additions and 1 deletions
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6
src/runtime/hashmap.go
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@ -174,6 +174,10 @@ func (b *bmap) overflow(t *maptype) *bmap {
return *(**bmap)(add(unsafe.Pointer(b), uintptr(t.bucketsize)-sys.PtrSize))
}
func (b *bmap) setoverflow(t *maptype, ovf *bmap) {
*(**bmap)(add(unsafe.Pointer(b), uintptr(t.bucketsize)-sys.PtrSize)) = ovf
}
// incrnoverflow increments h.noverflow.
// noverflow counts the number of overflow buckets.
// This is used to trigger same-size map growth.
@ -207,7 +211,7 @@ func (h *hmap) newoverflow(t *maptype, b *bmap) *bmap {
h.createOverflow()
*h.extra.overflow[0] = append(*h.extra.overflow[0], ovf)
}
*(**bmap)(add(unsafe.Pointer(b), uintptr(t.bucketsize)-sys.PtrSize)) = ovf
b.setoverflow(t, ovf)
return ovf
}