package vm import ( "errors" "fmt" "sort" "github.com/nspcc-dev/neo-go/pkg/smartcontract" "github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger" "github.com/nspcc-dev/neo-go/pkg/vm/emit" "github.com/nspcc-dev/neo-go/pkg/vm/stackitem" ) // InteropFunc allows to hook into the VM. type InteropFunc func(vm *VM) error // InteropFuncPrice represents an interop function with a price. type InteropFuncPrice struct { Func InteropFunc Price int64 // AllowedTriggers is a mask representing triggers which should be allowed by an interop. // 0 is interpreted as All. AllowedTriggers trigger.Type RequiredFlags smartcontract.CallFlag } // interopIDFuncPrice adds an ID to the InteropFuncPrice. type interopIDFuncPrice struct { ID uint32 InteropFuncPrice } // InteropGetterFunc is a function that returns an interop function-price // structure by the given interop ID. type InteropGetterFunc func(uint32) *InteropFuncPrice var defaultVMInterops = []interopIDFuncPrice{ {emit.InteropNameToID([]byte("System.Binary.Deserialize")), InteropFuncPrice{Func: RuntimeDeserialize, Price: 500000}}, {emit.InteropNameToID([]byte("System.Binary.Serialize")), InteropFuncPrice{Func: RuntimeSerialize, Price: 100000}}, {emit.InteropNameToID([]byte("System.Runtime.Log")), InteropFuncPrice{Func: runtimeLog, Price: 1000000, RequiredFlags: smartcontract.AllowNotify}}, {emit.InteropNameToID([]byte("System.Runtime.Notify")), InteropFuncPrice{Func: runtimeNotify, Price: 1000000, RequiredFlags: smartcontract.AllowNotify}}, {emit.InteropNameToID([]byte("System.Enumerator.Create")), InteropFuncPrice{Func: EnumeratorCreate, Price: 400}}, {emit.InteropNameToID([]byte("System.Enumerator.Next")), InteropFuncPrice{Func: EnumeratorNext, Price: 1000000}}, {emit.InteropNameToID([]byte("System.Enumerator.Concat")), InteropFuncPrice{Func: EnumeratorConcat, Price: 400}}, {emit.InteropNameToID([]byte("System.Enumerator.Value")), InteropFuncPrice{Func: EnumeratorValue, Price: 400}}, {emit.InteropNameToID([]byte("System.Iterator.Create")), InteropFuncPrice{Func: IteratorCreate, Price: 400}}, {emit.InteropNameToID([]byte("System.Iterator.Concat")), InteropFuncPrice{Func: IteratorConcat, Price: 400}}, {emit.InteropNameToID([]byte("System.Iterator.Key")), InteropFuncPrice{Func: IteratorKey, Price: 400}}, {emit.InteropNameToID([]byte("System.Iterator.Keys")), InteropFuncPrice{Func: IteratorKeys, Price: 400}}, {emit.InteropNameToID([]byte("System.Iterator.Values")), InteropFuncPrice{Func: IteratorValues, Price: 400}}, } func getDefaultVMInterop(id uint32) *InteropFuncPrice { n := sort.Search(len(defaultVMInterops), func(i int) bool { return defaultVMInterops[i].ID >= id }) if n < len(defaultVMInterops) && defaultVMInterops[n].ID == id { return &defaultVMInterops[n].InteropFuncPrice } return nil } // runtimeLog handles the syscall "System.Runtime.Log" for printing and logging stuff. func runtimeLog(vm *VM) error { item := vm.Estack().Pop() fmt.Printf("NEO-GO-VM (log) > %s\n", item.Value()) return nil } // runtimeNotify handles the syscall "System.Runtime.Notify" for printing and logging stuff. func runtimeNotify(vm *VM) error { item := vm.Estack().Pop() fmt.Printf("NEO-GO-VM (notify) > %s\n", item.Value()) return nil } // RuntimeSerialize handles System.Binary.Serialize syscall. func RuntimeSerialize(vm *VM) error { item := vm.Estack().Pop() data, err := stackitem.SerializeItem(item.value) if err != nil { return err } else if len(data) > stackitem.MaxSize { return errors.New("too big item") } vm.Estack().PushVal(data) return nil } // RuntimeDeserialize handles System.Binary.Deserialize syscall. func RuntimeDeserialize(vm *VM) error { data := vm.Estack().Pop().Bytes() item, err := stackitem.DeserializeItem(data) if err != nil { return err } vm.Estack().Push(&Element{value: item}) return nil } // init sorts the global defaultVMInterops value. func init() { sort.Slice(defaultVMInterops, func(i, j int) bool { return defaultVMInterops[i].ID < defaultVMInterops[j].ID }) } // EnumeratorCreate handles syscall System.Enumerator.Create. func EnumeratorCreate(v *VM) error { data := v.Estack().Pop().Array() v.Estack().Push(&Element{ value: stackitem.NewInterop(&arrayWrapper{ index: -1, value: data, }), }) return nil } // EnumeratorNext handles syscall System.Enumerator.Next. func EnumeratorNext(v *VM) error { iop := v.Estack().Pop().Interop() arr := iop.Value().(enumerator) v.Estack().PushVal(arr.Next()) return nil } // EnumeratorValue handles syscall System.Enumerator.Value. func EnumeratorValue(v *VM) error { iop := v.Estack().Pop().Interop() arr := iop.Value().(enumerator) v.Estack().Push(&Element{value: arr.Value()}) return nil } // EnumeratorConcat handles syscall System.Enumerator.Concat. func EnumeratorConcat(v *VM) error { iop1 := v.Estack().Pop().Interop() arr1 := iop1.Value().(enumerator) iop2 := v.Estack().Pop().Interop() arr2 := iop2.Value().(enumerator) v.Estack().Push(&Element{ value: stackitem.NewInterop(&concatEnum{ current: arr1, second: arr2, }), }) return nil } // IteratorCreate handles syscall System.Iterator.Create. func IteratorCreate(v *VM) error { data := v.Estack().Pop() var item stackitem.Item switch t := data.value.(type) { case *stackitem.Array, *stackitem.Struct: item = stackitem.NewInterop(&arrayWrapper{ index: -1, value: t.Value().([]stackitem.Item), }) case *stackitem.Map: item = NewMapIterator(t) default: return errors.New("non-iterable type") } v.Estack().Push(&Element{value: item}) return nil } // NewMapIterator returns new interop item containing iterator over m. func NewMapIterator(m *stackitem.Map) *stackitem.Interop { return stackitem.NewInterop(&mapWrapper{ index: -1, m: m.Value().([]stackitem.MapElement), }) } // IteratorConcat handles syscall System.Iterator.Concat. func IteratorConcat(v *VM) error { iop1 := v.Estack().Pop().Interop() iter1 := iop1.Value().(iterator) iop2 := v.Estack().Pop().Interop() iter2 := iop2.Value().(iterator) v.Estack().Push(&Element{value: stackitem.NewInterop( &concatIter{ current: iter1, second: iter2, }, )}) return nil } // IteratorKey handles syscall System.Iterator.Key. func IteratorKey(v *VM) error { iop := v.estack.Pop().Interop() iter := iop.Value().(iterator) v.Estack().Push(&Element{value: iter.Key()}) return nil } // IteratorKeys handles syscall System.Iterator.Keys. func IteratorKeys(v *VM) error { iop := v.estack.Pop().Interop() iter := iop.Value().(iterator) v.Estack().Push(&Element{value: stackitem.NewInterop( &keysWrapper{iter}, )}) return nil } // IteratorValues handles syscall System.Iterator.Values. func IteratorValues(v *VM) error { iop := v.estack.Pop().Interop() iter := iop.Value().(iterator) v.Estack().Push(&Element{value: stackitem.NewInterop( &valuesWrapper{iter}, )}) return nil }