47 lines
889 B
Go
47 lines
889 B
Go
package vm
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import (
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// Slot is a fixed-size slice of stack items.
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type Slot struct {
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storage []stackitem.Item
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refs *refCounter
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}
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// newSlot returns new slot of n items.
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func newSlot(n int, refs *refCounter) *Slot {
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return &Slot{
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storage: make([]stackitem.Item, n),
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refs: refs,
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}
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}
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func (v *VM) newSlot(n int) *Slot {
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return newSlot(n, v.refs)
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}
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// Set sets i-th storage slot.
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func (s *Slot) Set(i int, item stackitem.Item) {
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if s.storage[i] == item {
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return
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}
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old := s.storage[i]
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s.storage[i] = item
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if old != nil {
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s.refs.Remove(old)
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}
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s.refs.Add(item)
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}
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// Get returns item contained in i-th slot.
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func (s *Slot) Get(i int) stackitem.Item {
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if item := s.storage[i]; item != nil {
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return item
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}
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return stackitem.Null{}
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}
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// Size returns slot size.
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func (s *Slot) Size() int { return len(s.storage) }
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