core: support System.Runtime.GetAddressVersion syscall

pkg/compiler/syscall_test.go

@@ -71,6 +71,7 @@ func TestSyscallExecution(t *testing.T) {
 		"runtime.BurnGas":                  {interopnames.SystemRuntimeBurnGas, []string{"1"}, true},
 		"runtime.CheckWitness":             {interopnames.SystemRuntimeCheckWitness, []string{b}, false},
 		"runtime.GasLeft":                  {interopnames.SystemRuntimeGasLeft, nil, false},
+		"runtime.GetAddressVersion":        {interopnames.SystemRuntimeGetAddressVersion, nil, false},
 		"runtime.GetCallingScriptHash":     {interopnames.SystemRuntimeGetCallingScriptHash, nil, false},
 		"runtime.GetEntryScriptHash":       {interopnames.SystemRuntimeGetEntryScriptHash, nil, false},
 		"runtime.GetExecutingScriptHash":   {interopnames.SystemRuntimeGetExecutingScriptHash, nil, false},

pkg/core/interop/interopnames/names.go

@@ -16,6 +16,7 @@ const (
 	SystemRuntimeBurnGas                = "System.Runtime.BurnGas"
 	SystemRuntimeCheckWitness           = "System.Runtime.CheckWitness"
 	SystemRuntimeGasLeft                = "System.Runtime.GasLeft"
+	SystemRuntimeGetAddressVersion      = "System.Runtime.GetAddressVersion"
 	SystemRuntimeGetCallingScriptHash   = "System.Runtime.GetCallingScriptHash"
 	SystemRuntimeGetEntryScriptHash     = "System.Runtime.GetEntryScriptHash"
 	SystemRuntimeGetExecutingScriptHash = "System.Runtime.GetExecutingScriptHash"
@@ -51,6 +52,7 @@ var names = []string{
 	SystemRuntimeBurnGas,
 	SystemRuntimeCheckWitness,
 	SystemRuntimeGasLeft,
+	SystemRuntimeGetAddressVersion,
 	SystemRuntimeGetCallingScriptHash,
 	SystemRuntimeGetEntryScriptHash,
 	SystemRuntimeGetExecutingScriptHash,

pkg/core/interop/runtime/util.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/nspcc-dev/neo-go/pkg/core/interop"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm"
@@ -72,6 +73,12 @@ func GetInvocationCounter(ic *interop.Context) error {
 	return nil
 }
 
+// GetAddressVersion returns the address version of the current protocol.
+func GetAddressVersion(ic *interop.Context) error {
+	ic.VM.Estack().PushItem(stackitem.NewBigInteger(big.NewInt(int64(address.NEO3Prefix))))
+	return nil
+}
+
 // GetNetwork returns chain network number.
 func GetNetwork(ic *interop.Context) error {
 	m := ic.Chain.GetConfig().Magic

pkg/core/interop_system_neotest_test.go

@@ -13,6 +13,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neo-go/pkg/io"
 	"github.com/nspcc-dev/neo-go/pkg/neotest"
 	"github.com/nspcc-dev/neo-go/pkg/neotest/chain"
@@ -207,6 +208,16 @@ func TestSystemRuntimeGetNetwork(t *testing.T) {
 	e.InvokeScriptCheckHALT(t, w.Bytes(), []neotest.Signer{acc}, stackitem.NewBigInteger(big.NewInt(int64(bc.GetConfig().Magic))))
 }
 
+func TestSystemRuntimeGetAddressVersion(t *testing.T) {
+	bc, acc := chain.NewSingle(t)
+	e := neotest.NewExecutor(t, bc, acc, acc)
+	w := io.NewBufBinWriter()
+
+	emit.Syscall(w.BinWriter, interopnames.SystemRuntimeGetAddressVersion)
+	require.NoError(t, w.Err)
+	e.InvokeScriptCheckHALT(t, w.Bytes(), []neotest.Signer{acc}, stackitem.NewBigInteger(big.NewInt(int64(address.NEO3Prefix))))
+}
+
 func TestSystemRuntimeBurnGas(t *testing.T) {
 	bc, acc := chain.NewSingle(t)
 	e := neotest.NewExecutor(t, bc, acc, acc)

pkg/core/interops.go

@@ -46,6 +46,7 @@ var systemInterops = []interop.Function{
 	{Name: interopnames.SystemRuntimeCheckWitness, Func: runtime.CheckWitness, Price: 1 << 10,
 		RequiredFlags: callflag.NoneFlag, ParamCount: 1},
 	{Name: interopnames.SystemRuntimeGasLeft, Func: runtime.GasLeft, Price: 1 << 4},
+	{Name: interopnames.SystemRuntimeGetAddressVersion, Func: runtime.GetAddressVersion, Price: 1 << 3},
 	{Name: interopnames.SystemRuntimeGetCallingScriptHash, Func: runtime.GetCallingScriptHash, Price: 1 << 4},
 	{Name: interopnames.SystemRuntimeGetEntryScriptHash, Func: runtime.GetEntryScriptHash, Price: 1 << 4},
 	{Name: interopnames.SystemRuntimeGetExecutingScriptHash, Func: runtime.GetExecutingScriptHash, Price: 1 << 4},

pkg/interop/runtime/runtime.go

@@ -46,6 +46,14 @@ func Notify(name string, args ...interface{}) {
 	neogointernal.Syscall2NoReturn("System.Runtime.Notify", name, args)
 }
 
+// GetAddressVersion returns the address version of the current protocol. The
+// address version represents the byte used to prepend to Neo addresses when
+// encoding them. The default value for Neo3 is 53 (0x35). This function uses
+// `System.Runtime.GetAddressVersion` syscall.
+func GetAddressVersion() int {
+	return neogointernal.Syscall0("System.Runtime.GetAddressVersion").(int)
+}
+
 // GetNetwork returns network magic number. This function uses
 // `System.Runtime.GetNetwork` syscall.
 func GetNetwork() int {