vm: use ID-based syscalls

In NEO3 SYSCALL opcode has 4-byte ID parameter.
This commit removes support for string-based syscalls and
changes SYSCALL's parameter to be fixed 4-byte value.

pkg/core/gas_price_test.go

@@ -24,13 +24,13 @@ func TestGetPrice(t *testing.T) {
 
 	t.Run("Neo.Asset.Create", func(t *testing.T) {
 		// Neo.Asset.Create: 83c5c61f
-		v.Load([]byte{0x68, 0x04, 0x83, 0xc5, 0xc6, 0x1f})
+		v.Load([]byte{0x68, 0x83, 0xc5, 0xc6, 0x1f})
 		checkGas(t, util.Fixed8FromInt64(5000), v)
 	})
 
 	t.Run("Neo.Asset.Renew", func(t *testing.T) {
 		// Neo.Asset.Renew: 78849071 (requires push 09 push 09 before)
-		v.Load([]byte{0x59, 0x59, 0x68, 0x04, 0x78, 0x84, 0x90, 0x71})
+		v.Load([]byte{0x59, 0x59, 0x68, 0x78, 0x84, 0x90, 0x71})
 		require.NoError(t, v.StepInto()) // push 9
 		require.NoError(t, v.StepInto()) // push 9
 
@@ -39,7 +39,7 @@ func TestGetPrice(t *testing.T) {
 
 	t.Run("Neo.Contract.Create (no props)", func(t *testing.T) {
 		// Neo.Contract.Create: f66ca56e (requires push properties on fourth position)
-		v.Load([]byte{0x00, 0x00, 0x00, 0x00, 0x68, 0x04, 0xf6, 0x6c, 0xa5, 0x6e})
+		v.Load([]byte{0x00, 0x00, 0x00, 0x00, 0x68, 0xf6, 0x6c, 0xa5, 0x6e})
 		require.NoError(t, v.StepInto()) // push 0 - ContractPropertyState.NoProperty
 		require.NoError(t, v.StepInto()) // push 0
 		require.NoError(t, v.StepInto()) // push 0
@@ -50,7 +50,7 @@ func TestGetPrice(t *testing.T) {
 
 	t.Run("Neo.Contract.Create (has storage)", func(t *testing.T) {
 		// Neo.Contract.Create: f66ca56e (requires push properties on fourth position)
-		v.Load([]byte{0x51, 0x00, 0x00, 0x00, 0x68, 0x04, 0xf6, 0x6c, 0xa5, 0x6e})
+		v.Load([]byte{0x51, 0x00, 0x00, 0x00, 0x68, 0xf6, 0x6c, 0xa5, 0x6e})
 		require.NoError(t, v.StepInto()) // push 01 - ContractPropertyState.HasStorage
 		require.NoError(t, v.StepInto()) // push 0
 		require.NoError(t, v.StepInto()) // push 0
@@ -61,7 +61,7 @@ func TestGetPrice(t *testing.T) {
 
 	t.Run("Neo.Contract.Create (has dynamic invoke)", func(t *testing.T) {
 		// Neo.Contract.Create: f66ca56e (requires push properties on fourth position)
-		v.Load([]byte{0x52, 0x00, 0x00, 0x00, 0x68, 0x04, 0xf6, 0x6c, 0xa5, 0x6e})
+		v.Load([]byte{0x52, 0x00, 0x00, 0x00, 0x68, 0xf6, 0x6c, 0xa5, 0x6e})
 		require.NoError(t, v.StepInto()) // push 02 - ContractPropertyState.HasDynamicInvoke
 		require.NoError(t, v.StepInto()) // push 0
 		require.NoError(t, v.StepInto()) // push 0
@@ -72,7 +72,7 @@ func TestGetPrice(t *testing.T) {
 
 	t.Run("Neo.Contract.Create (has both storage and dynamic invoke)", func(t *testing.T) {
 		// Neo.Contract.Create: f66ca56e (requires push properties on fourth position)
-		v.Load([]byte{0x53, 0x00, 0x00, 0x00, 0x68, 0x04, 0xf6, 0x6c, 0xa5, 0x6e})
+		v.Load([]byte{0x53, 0x00, 0x00, 0x00, 0x68, 0xf6, 0x6c, 0xa5, 0x6e})
 		require.NoError(t, v.StepInto()) // push 03 - HasStorage and HasDynamicInvoke
 		require.NoError(t, v.StepInto()) // push 0
 		require.NoError(t, v.StepInto()) // push 0
@@ -83,7 +83,7 @@ func TestGetPrice(t *testing.T) {
 
 	t.Run("Neo.Contract.Migrate", func(t *testing.T) {
 		// Neo.Contract.Migrate: 471b6290 (requires push properties on fourth position)
-		v.Load([]byte{0x00, 0x00, 0x00, 0x00, 0x68, 0x04, 0x47, 0x1b, 0x62, 0x90})
+		v.Load([]byte{0x00, 0x00, 0x00, 0x00, 0x68, 0x47, 0x1b, 0x62, 0x90})
 		require.NoError(t, v.StepInto()) // push 0 - ContractPropertyState.NoProperty
 		require.NoError(t, v.StepInto()) // push 0
 		require.NoError(t, v.StepInto()) // push 0
@@ -94,7 +94,7 @@ func TestGetPrice(t *testing.T) {
 
 	t.Run("System.Storage.Put", func(t *testing.T) {
 		// System.Storage.Put: e63f1884 (requires push key and value)
-		v.Load([]byte{0x53, 0x53, 0x00, 0x68, 0x04, 0xe6, 0x3f, 0x18, 0x84})
+		v.Load([]byte{0x53, 0x53, 0x00, 0x68, 0xe6, 0x3f, 0x18, 0x84})
 		require.NoError(t, v.StepInto()) // push 03 (length 1)
 		require.NoError(t, v.StepInto()) // push 03 (length 1)
 		require.NoError(t, v.StepInto()) // push 00
@@ -104,7 +104,7 @@ func TestGetPrice(t *testing.T) {
 
 	t.Run("System.Storage.PutEx", func(t *testing.T) {
 		// System.Storage.PutEx: 73e19b3a (requires push key and value)
-		v.Load([]byte{0x53, 0x53, 0x00, 0x68, 0x04, 0x73, 0xe1, 0x9b, 0x3a})
+		v.Load([]byte{0x53, 0x53, 0x00, 0x68, 0x73, 0xe1, 0x9b, 0x3a})
 		require.NoError(t, v.StepInto()) // push 03 (length 1)
 		require.NoError(t, v.StepInto()) // push 03 (length 1)
 		require.NoError(t, v.StepInto()) // push 00

pkg/rpc/server/server_test.go

@@ -43,20 +43,20 @@ type rpcTestCase struct {
 	check  func(t *testing.T, e *executor, result interface{})
 }
 
-const testContractHash = "c2789e5ab9bab828743833965b1df0d5fbcc206f"
+const testContractHash = "1b5cbfaa2e54b584d3240e38fc4bd413a65ea40c"
 
 var rpcTestCases = map[string][]rpcTestCase{
 	"getapplicationlog": {
 		{
 			name:   "positive",
-			params: `["e5a6be3cd796e2284a55ebb2061f85d3f199263bbf659dbd5b670a6506e7a4a0"]`,
+			params: `["d98e4b58783aa9665efcc5be19ee432772a94462efc8a5e4165776e6dd8c4e92"]`,
 			result: func(e *executor) interface{} { return &result.ApplicationLog{} },
 			check: func(t *testing.T, e *executor, acc interface{}) {
 				res, ok := acc.(*result.ApplicationLog)
 
 				require.True(t, ok)
 
-				expectedTxHash, err := util.Uint256DecodeStringLE("e5a6be3cd796e2284a55ebb2061f85d3f199263bbf659dbd5b670a6506e7a4a0")
+				expectedTxHash, err := util.Uint256DecodeStringLE("d98e4b58783aa9665efcc5be19ee432772a94462efc8a5e4165776e6dd8c4e92")
 				require.NoError(t, err)
 				assert.Equal(t, expectedTxHash, res.TxHash)
 				assert.Equal(t, 1, len(res.Executions))
@@ -405,25 +405,25 @@ var rpcTestCases = map[string][]rpcTestCase{
 	"getblockheader": {
 		{
 			name:   "positive, no verbose",
-			params: `["02b9e6f634578f34c6026f1676e25aa04f58889a320fba8bc632c6fe48c26cf1"]`,
+			params: `["60c00bfa7f283d1821e1bc8c1c83aa534f325968944d73fa25cf7235af17d608"]`,
 			result: func(e *executor) interface{} {
-				expected := "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"
+				expected := "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"
 				return &expected
 			},
 		},
 		{
 			name:   "positive, verbose 0",
-			params: `["02b9e6f634578f34c6026f1676e25aa04f58889a320fba8bc632c6fe48c26cf1", 0]`,
+			params: `["60c00bfa7f283d1821e1bc8c1c83aa534f325968944d73fa25cf7235af17d608", 0]`,
 			result: func(e *executor) interface{} {
-				expected := "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"
+				expected := "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"
 				return &expected
 			},
 		},
 		{
 			name:   "positive, verbose !=0",
-			params: `["02b9e6f634578f34c6026f1676e25aa04f58889a320fba8bc632c6fe48c26cf1", 2]`,
+			params: `["60c00bfa7f283d1821e1bc8c1c83aa534f325968944d73fa25cf7235af17d608", 2]`,
 			result: func(e *executor) interface{} {
-				hash, err := util.Uint256DecodeStringLE("02b9e6f634578f34c6026f1676e25aa04f58889a320fba8bc632c6fe48c26cf1")
+				hash, err := util.Uint256DecodeStringLE("60c00bfa7f283d1821e1bc8c1c83aa534f325968944d73fa25cf7235af17d608")
 				if err != nil {
 					panic("can not decode hash parameter")
 				}
@@ -822,7 +822,7 @@ var rpcTestCases = map[string][]rpcTestCase{
 		{
 			// If you are planning to modify test chain from `testblocks.acc`, please, update param value (first block)
 			name:   "empty block",
-			params: `["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"]`,
+			params: `["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"]`,
 			fail:   true,
 		},
 		{
@@ -848,7 +848,7 @@ var rpcTestCases = map[string][]rpcTestCase{
 		{
 			name: "positive",
 			// If you are planning to modify test chain from `testblocks.acc`, please, update param value (second block)
-			params: `["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"]`,
+			params: `["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"]`,
 			result: func(e *executor) interface{} {
 				v := true
 				return &v

pkg/vm/context.go

@@ -74,7 +74,7 @@ func (c *Context) Next() (opcode.Opcode, []byte, error) {
 
 	var numtoread int
 	switch instr {
-	case opcode.PUSHDATA1, opcode.SYSCALL:
+	case opcode.PUSHDATA1:
 		if c.nextip >= len(c.prog) {
 			err = errNoInstParam
 		} else {
@@ -101,7 +101,7 @@ func (c *Context) Next() (opcode.Opcode, []byte, error) {
 		}
 	case opcode.JMP, opcode.JMPIF, opcode.JMPIFNOT, opcode.CALL, opcode.CALLED, opcode.CALLEDT:
 		numtoread = 2
-	case opcode.CALLI:
+	case opcode.CALLI, opcode.SYSCALL:
 		numtoread = 4
 	case opcode.APPCALL, opcode.TAILCALL:
 		numtoread = 20

pkg/vm/emit/emit.go

@@ -108,9 +108,8 @@ func Syscall(w *io.BinWriter, api string) {
 		w.Err = errors.New("syscall api cannot be of length 0")
 		return
 	}
-	buf := make([]byte, len(api)+1)
+	buf := make([]byte, 4)
-	buf[0] = byte(len(api))
+	binary.LittleEndian.PutUint32(buf, InteropNameToID([]byte(api)))
-	copy(buf[1:], api)
 	Instruction(w, opcode.SYSCALL, buf)
 }
 

pkg/vm/emit/emit_test.go

@@ -165,9 +165,9 @@ func TestEmitSyscall(t *testing.T) {
 	for _, syscall := range syscalls {
 		Syscall(buf.BinWriter, syscall)
 		result := buf.Bytes()
+		assert.Equal(t, 5, len(result))
 		assert.Equal(t, opcode.Opcode(result[0]), opcode.SYSCALL)
-		assert.Equal(t, result[1], uint8(len(syscall)))
+		assert.Equal(t, binary.LittleEndian.Uint32(result[1:]), InteropNameToID([]byte(syscall)))
-		assert.Equal(t, result[2:], []byte(syscall))
 		buf.Reset()
 	}
 

pkg/vm/vm.go

@@ -14,7 +14,6 @@ import (
 	"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/util"
-	"github.com/nspcc-dev/neo-go/pkg/vm/emit"
 	"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
 	"github.com/pkg/errors"
 )
@@ -480,11 +479,7 @@ func (v *VM) SetScriptGetter(gs func(util.Uint160) ([]byte, bool)) {
 
 // GetInteropID converts instruction parameter to an interop ID.
 func GetInteropID(parameter []byte) uint32 {
-	if len(parameter) == 4 {
+	return binary.LittleEndian.Uint32(parameter)
-		return binary.LittleEndian.Uint32(parameter)
-	}
-
-	return emit.InteropNameToID(parameter)
 }
 
 // GetInteropByID returns interop function together with price.

pkg/vm/vm_test.go

@@ -41,22 +41,6 @@ func TestInteropHook(t *testing.T) {
 	assert.Equal(t, big.NewInt(1), v.estack.Pop().value.Value())
 }
 
-func TestInteropHookViaID(t *testing.T) {
-	v := New()
-	v.RegisterInteropGetter(fooInteropGetter)
-
-	buf := io.NewBufBinWriter()
-	fooid := emit.InteropNameToID([]byte("foo"))
-	var id = make([]byte, 4)
-	binary.LittleEndian.PutUint32(id, fooid)
-	emit.Syscall(buf.BinWriter, string(id))
-	emit.Opcode(buf.BinWriter, opcode.RET)
-	v.Load(buf.Bytes())
-	runVM(t, v)
-	assert.Equal(t, 1, v.estack.Len())
-	assert.Equal(t, big.NewInt(1), v.estack.Pop().value.Value())
-}
-
 func TestRegisterInteropGetter(t *testing.T) {
 	v := New()
 	currRegistered := len(v.getInterop)
@@ -563,11 +547,9 @@ func TestIteratorValues(t *testing.T) {
 }
 
 func getSyscallProg(name string) (prog []byte) {
-	prog = []byte{byte(opcode.SYSCALL)}
+	buf := io.NewBufBinWriter()
-	prog = append(prog, byte(len(name)))
+	emit.Syscall(buf.BinWriter, name)
-	prog = append(prog, name...)
+	return buf.Bytes()
-
-	return
 }
 
 func getSerializeProg() (prog []byte) {
@@ -704,15 +686,21 @@ func TestSerializeMap(t *testing.T) {
 }
 
 func TestSerializeMapCompat(t *testing.T) {
-	// Create a map, push key and value, add KV to map, serialize.
-	progHex := "c776036b65790576616c7565c468154e656f2e52756e74696d652e53657269616c697a65"
 	resHex := "820100036b6579000576616c7565"
-	prog, err := hex.DecodeString(progHex)
-	require.NoError(t, err)
 	res, err := hex.DecodeString(resHex)
 	require.NoError(t, err)
 
-	vm := load(prog)
+	// Create a map, push key and value, add KV to map, serialize.
+	buf := io.NewBufBinWriter()
+	emit.Opcode(buf.BinWriter, opcode.NEWMAP)
+	emit.Opcode(buf.BinWriter, opcode.DUP)
+	emit.Bytes(buf.BinWriter, []byte("key"))
+	emit.Bytes(buf.BinWriter, []byte("value"))
+	emit.Opcode(buf.BinWriter, opcode.SETITEM)
+	emit.Syscall(buf.BinWriter, "Neo.Runtime.Serialize")
+	require.NoError(t, buf.Err)
+
+	vm := load(buf.Bytes())
 	runVM(t, vm)
 	assert.Equal(t, res, vm.estack.Pop().Bytes())
 }