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runtime: refactor hmap setoverflow into newoverflow

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This simplifies the code, as well as providing
a single place to modify to change the
allocation of new overflow buckets.

Updates #19931
Updates #19992

Change-Id: I77070619f5c8fe449bbc35278278bca5eda780f2
Reviewed-on: https://go-review.googlesource.com/40975
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 2017-04-13 05:25:20 -07:00
parent dc444418d9
commit 619af17205
2 changed files with 9 additions and 13 deletions
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13
src/runtime/hashmap.go
View File

@ -196,13 +196,15 @@ func (h *hmap) incrnoverflow() {
}
}
func (h *hmap) setoverflow(t *maptype, b, ovf *bmap) {
func (h *hmap) newoverflow(t *maptype, b *bmap) *bmap {
ovf := (*bmap)(newobject(t.bucket))
h.incrnoverflow()
if t.bucket.kind&kindNoPointers != 0 {
h.createOverflow()
*h.overflow[0] = append(*h.overflow[0], ovf)
}
*(**bmap)(add(unsafe.Pointer(b), uintptr(t.bucketsize)-sys.PtrSize)) = ovf
return ovf
}
func (h *hmap) createOverflow() {
@ -565,8 +567,7 @@ again:
if inserti == nil {
// all current buckets are full, allocate a new one.
newb := (*bmap)(newobject(t.bucket))
h.setoverflow(t, b, newb)
newb := h.newoverflow(t, b)
inserti = &newb.tophash[0]
insertk = add(unsafe.Pointer(newb), dataOffset)
val = add(insertk, bucketCnt*uintptr(t.keysize))
@ -1045,8 +1046,7 @@ func evacuate(t *maptype, h *hmap, oldbucket uintptr) {
if useX {
b.tophash[i] = evacuatedX
if xi == bucketCnt {
newx := (*bmap)(newobject(t.bucket))
h.setoverflow(t, x, newx)
newx := h.newoverflow(t, x)
x = newx
xi = 0
xk = add(unsafe.Pointer(x), dataOffset)
@ -1069,8 +1069,7 @@ func evacuate(t *maptype, h *hmap, oldbucket uintptr) {
} else {
b.tophash[i] = evacuatedY
if yi == bucketCnt {
newy := (*bmap)(newobject(t.bucket))
h.setoverflow(t, y, newy)
newy := h.newoverflow(t, y)
y = newy
yi = 0
yk = add(unsafe.Pointer(y), dataOffset)

9
src/runtime/hashmap_fast.go
View File

@ -490,8 +490,7 @@ again:
if inserti == nil {
// all current buckets are full, allocate a new one.
newb := (*bmap)(newobject(t.bucket))
h.setoverflow(t, b, newb)
newb := h.newoverflow(t, b)
inserti = &newb.tophash[0]
insertk = add(unsafe.Pointer(newb), dataOffset)
val = add(insertk, bucketCnt*4)
@ -579,8 +578,7 @@ again:
if inserti == nil {
// all current buckets are full, allocate a new one.
newb := (*bmap)(newobject(t.bucket))
h.setoverflow(t, b, newb)
newb := h.newoverflow(t, b)
inserti = &newb.tophash[0]
insertk = add(unsafe.Pointer(newb), dataOffset)
val = add(insertk, bucketCnt*8)
@ -673,8 +671,7 @@ again:
if inserti == nil {
// all current buckets are full, allocate a new one.
newb := (*bmap)(newobject(t.bucket))
h.setoverflow(t, b, newb)
newb := h.newoverflow(t, b)
inserti = &newb.tophash[0]
insertk = add(unsafe.Pointer(newb), dataOffset)
val = add(insertk, bucketCnt*2*sys.PtrSize)