neoneo-go/pkg/vm/ref_counter.go
Evgeniy Stratonikov 4f98ec2f53 vm: embed reference counter in compound items
```
name              old time/op  new time/op  delta
RefCounter_Add-8  44.8ns ± 4%  11.7ns ± 3%  -73.94%  (p=0.000 n=10+10)
```

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
2021-08-13 14:41:26 +03:00

67 lines
1.2 KiB
Go

package vm
import (
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// refCounter represents reference counter for the VM.
type refCounter int
type (
rcInc interface {
IncRC() int
}
rcDec interface {
DecRC() 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++
irc, ok := item.(rcInc)
if !ok || irc.IncRC() > 1 {
return
}
switch t := item.(type) {
case *stackitem.Array, *stackitem.Struct:
for _, it := range item.Value().([]stackitem.Item) {
r.Add(it)
}
case *stackitem.Map:
for i := range t.Value().([]stackitem.MapElement) {
r.Add(t.Value().([]stackitem.MapElement)[i].Value)
}
}
}
// Remove removes item from the reference counter.
func (r *refCounter) Remove(item stackitem.Item) {
if r == nil {
return
}
*r--
irc, ok := item.(rcDec)
if !ok || irc.DecRC() > 0 {
return
}
switch t := item.(type) {
case *stackitem.Array, *stackitem.Struct:
for _, it := range item.Value().([]stackitem.Item) {
r.Remove(it)
}
case *stackitem.Map:
for i := range t.Value().([]stackitem.MapElement) {
r.Remove(t.Value().([]stackitem.MapElement)[i].Value)
}
}
}