66 lines
1.3 KiB
Go
66 lines
1.3 KiB
Go
package vm
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import (
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"encoding/json"
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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 []stackitem.Item
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// init sets static slot size to n. It is intended to be used only by INITSSLOT.
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func (s *slot) init(n int) {
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if *s != nil {
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panic("already initialized")
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}
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*s = make([]stackitem.Item, n)
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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, refs *refCounter) {
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if s[i] == item {
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return
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}
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old := s[i]
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s[i] = item
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if old != nil {
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refs.Remove(old)
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}
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refs.Add(item)
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}
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// Get returns the item contained in the i-th slot.
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func (s slot) Get(i int) stackitem.Item {
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if item := s[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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// Clear removes all slot variables from the reference counter.
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func (s slot) Clear(refs *refCounter) {
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for _, item := range s {
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refs.Remove(item)
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}
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}
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// Size returns the slot size.
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func (s slot) Size() int {
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if s == nil {
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panic("not initialized")
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}
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return len(s)
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}
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// MarshalJSON implements the JSON marshalling interface.
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func (s slot) MarshalJSON() ([]byte, error) {
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arr := make([]json.RawMessage, len(s))
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for i := range s {
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data, err := stackitem.ToJSONWithTypes(s[i])
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if err == nil {
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arr[i] = data
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}
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}
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return json.Marshal(arr)
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}
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