neoneo-go/pkg/vm/ref_counter.go
Evgeniy Stratonikov 9712be78fd vm: optimize refcounter
```
name                    old time/op    new time/op    delta
RefCounter_Add-8          9.47ns ± 4%    2.75ns ± 1%   -70.92%  (p=0.000 n=10+9)
RefCounter_AddRemove-8    88.9ns ±20%     5.5ns ± 4%   -93.78%  (p=0.000 n=10+10)

name                    old alloc/op   new alloc/op   delta
RefCounter_Add-8           0.00B          0.00B           ~     (all equal)
RefCounter_AddRemove-8     48.0B ± 0%      0.0B       -100.00%  (p=0.000 n=10+10)

name                    old allocs/op  new allocs/op  delta
RefCounter_Add-8            0.00           0.00           ~     (all equal)
RefCounter_AddRemove-8      2.00 ± 0%      0.00       -100.00%  (p=0.000 n=10+10)
```

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
2022-08-23 13:18:06 +03:00

74 lines
1.4 KiB
Go

package vm
import (
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// refCounter represents a reference counter for the VM.
type refCounter int
func newRefCounter() *refCounter {
return new(refCounter)
}
// Add adds an item to the reference counter.
func (r *refCounter) Add(item stackitem.Item) {
if r == nil {
return
}
*r++
switch t := item.(type) {
case *stackitem.Array:
if t.IncRC() == 1 {
for _, it := range t.Value().([]stackitem.Item) {
r.Add(it)
}
}
case *stackitem.Struct:
if t.IncRC() == 1 {
for _, it := range t.Value().([]stackitem.Item) {
r.Add(it)
}
}
case *stackitem.Map:
if t.IncRC() == 1 {
elems := t.Value().([]stackitem.MapElement)
for i := range elems {
r.Add(elems[i].Key)
r.Add(elems[i].Value)
}
}
}
}
// Remove removes an item from the reference counter.
func (r *refCounter) Remove(item stackitem.Item) {
if r == nil {
return
}
*r--
switch t := item.(type) {
case *stackitem.Array:
if t.DecRC() == 0 {
for _, it := range t.Value().([]stackitem.Item) {
r.Remove(it)
}
}
case *stackitem.Struct:
if t.DecRC() == 0 {
for _, it := range t.Value().([]stackitem.Item) {
r.Remove(it)
}
}
case *stackitem.Map:
if t.DecRC() == 0 {
elems := t.Value().([]stackitem.MapElement)
for i := range elems {
r.Remove(elems[i].Key)
r.Remove(elems[i].Value)
}
}
}
}