vm: move Emit* functions to a separate package

Also strip 'Emit' prefix because 'emit' is now
in the package name.

pkg/core/blockchain.go

@@ -23,6 +23,7 @@ import (
 	"github.com/CityOfZion/neo-go/pkg/smartcontract/trigger"
 	"github.com/CityOfZion/neo-go/pkg/util"
 	"github.com/CityOfZion/neo-go/pkg/vm"
+	"github.com/CityOfZion/neo-go/pkg/vm/emit"
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
 )
@@ -1486,7 +1487,7 @@ func ScriptFromWitness(hash util.Uint160, witness *transaction.Witness) ([]byte,
 
 	if len(verification) == 0 {
 		bb := new(bytes.Buffer)
-		err := vm.EmitAppCall(bb, hash, false)
+		err := emit.AppCall(bb, hash, false)
 		if err != nil {
 			return nil, err
 		}

pkg/rpc/txBuilder.go

@@ -12,7 +12,7 @@ import (
 	"github.com/CityOfZion/neo-go/pkg/io"
 	"github.com/CityOfZion/neo-go/pkg/smartcontract"
 	"github.com/CityOfZion/neo-go/pkg/util"
-	"github.com/CityOfZion/neo-go/pkg/vm"
+	"github.com/CityOfZion/neo-go/pkg/vm/emit"
 	"github.com/CityOfZion/neo-go/pkg/vm/opcode"
 	errs "github.com/pkg/errors"
 )
@@ -114,19 +114,19 @@ func CreateDeploymentScript(avm []byte, contract *ContractDetails) ([]byte, erro
 	var props smartcontract.PropertyState
 
 	script := new(bytes.Buffer)
-	if err := vm.EmitBytes(script, []byte(contract.Description)); err != nil {
+	if err := emit.Bytes(script, []byte(contract.Description)); err != nil {
 		return nil, err
 	}
-	if err := vm.EmitBytes(script, []byte(contract.Email)); err != nil {
+	if err := emit.Bytes(script, []byte(contract.Email)); err != nil {
 		return nil, err
 	}
-	if err := vm.EmitBytes(script, []byte(contract.Author)); err != nil {
+	if err := emit.Bytes(script, []byte(contract.Author)); err != nil {
 		return nil, err
 	}
-	if err := vm.EmitBytes(script, []byte(contract.Version)); err != nil {
+	if err := emit.Bytes(script, []byte(contract.Version)); err != nil {
 		return nil, err
 	}
-	if err := vm.EmitBytes(script, []byte(contract.ProjectName)); err != nil {
+	if err := emit.Bytes(script, []byte(contract.ProjectName)); err != nil {
 		return nil, err
 	}
 	if contract.HasStorage {
@@ -138,23 +138,23 @@ func CreateDeploymentScript(avm []byte, contract *ContractDetails) ([]byte, erro
 	if contract.IsPayable {
 		props |= smartcontract.IsPayable
 	}
-	if err := vm.EmitInt(script, int64(props)); err != nil {
+	if err := emit.Int(script, int64(props)); err != nil {
 		return nil, err
 	}
-	if err := vm.EmitInt(script, int64(contract.ReturnType)); err != nil {
+	if err := emit.Int(script, int64(contract.ReturnType)); err != nil {
 		return nil, err
 	}
 	params := make([]byte, len(contract.Parameters))
 	for k := range contract.Parameters {
 		params[k] = byte(contract.Parameters[k])
 	}
-	if err := vm.EmitBytes(script, params); err != nil {
+	if err := emit.Bytes(script, params); err != nil {
 		return nil, err
 	}
-	if err := vm.EmitBytes(script, avm); err != nil {
+	if err := emit.Bytes(script, avm); err != nil {
 		return nil, err
 	}
-	if err := vm.EmitSyscall(script, "Neo.Contract.Create"); err != nil {
+	if err := emit.Syscall(script, "Neo.Contract.Create"); err != nil {
 		return nil, err
 	}
 	return script.Bytes(), nil
@@ -174,7 +174,7 @@ func expandArrayIntoScript(script *bytes.Buffer, slice []Param) error {
 			if err != nil {
 				return err
 			}
-			if err := vm.EmitBytes(script, str); err != nil {
+			if err := emit.Bytes(script, str); err != nil {
 				return err
 			}
 		case String:
@@ -182,7 +182,7 @@ func expandArrayIntoScript(script *bytes.Buffer, slice []Param) error {
 			if err != nil {
 				return err
 			}
-			if err := vm.EmitString(script, str); err != nil {
+			if err := emit.String(script, str); err != nil {
 				return err
 			}
 		case Hash160:
@@ -190,7 +190,7 @@ func expandArrayIntoScript(script *bytes.Buffer, slice []Param) error {
 			if err != nil {
 				return err
 			}
-			if err := vm.EmitBytes(script, hash.BytesBE()); err != nil {
+			if err := emit.Bytes(script, hash.BytesBE()); err != nil {
 				return err
 			}
 		case Hash256:
@@ -198,7 +198,7 @@ func expandArrayIntoScript(script *bytes.Buffer, slice []Param) error {
 			if err != nil {
 				return err
 			}
-			if err := vm.EmitBytes(script, hash.BytesBE()); err != nil {
+			if err := emit.Bytes(script, hash.BytesBE()); err != nil {
 				return err
 			}
 		case PublicKey:
@@ -210,7 +210,7 @@ func expandArrayIntoScript(script *bytes.Buffer, slice []Param) error {
 			if err != nil {
 				return err
 			}
-			if err := vm.EmitBytes(script, key.Bytes()); err != nil {
+			if err := emit.Bytes(script, key.Bytes()); err != nil {
 				return err
 			}
 		case Integer:
@@ -218,7 +218,7 @@ func expandArrayIntoScript(script *bytes.Buffer, slice []Param) error {
 			if err != nil {
 				return err
 			}
-			if err := vm.EmitInt(script, int64(val)); err != nil {
+			if err := emit.Int(script, int64(val)); err != nil {
 				return err
 			}
 		case Boolean:
@@ -228,9 +228,9 @@ func expandArrayIntoScript(script *bytes.Buffer, slice []Param) error {
 			}
 			switch str {
 			case "true":
-				err = vm.EmitInt(script, 1)
+				err = emit.Int(script, 1)
 			case "false":
-				err = vm.EmitInt(script, 0)
+				err = emit.Int(script, 0)
 			default:
 				err = errors.New("wrong boolean value")
 			}
@@ -251,7 +251,7 @@ func CreateFunctionInvocationScript(contract util.Uint160, params Params) ([]byt
 	for i := len(params) - 1; i >= 0; i-- {
 		switch params[i].Type {
 		case stringT:
-			if err := vm.EmitString(script, params[i].String()); err != nil {
+			if err := emit.String(script, params[i].String()); err != nil {
 				return nil, err
 			}
 		case numberT:
@@ -259,7 +259,7 @@ func CreateFunctionInvocationScript(contract util.Uint160, params Params) ([]byt
 			if err != nil {
 				return nil, err
 			}
-			if err := vm.EmitString(script, strconv.Itoa(num)); err != nil {
+			if err := emit.String(script, strconv.Itoa(num)); err != nil {
 				return nil, err
 			}
 		case arrayT:
@@ -271,18 +271,18 @@ func CreateFunctionInvocationScript(contract util.Uint160, params Params) ([]byt
 			if err != nil {
 				return nil, err
 			}
-			err = vm.EmitInt(script, int64(len(slice)))
+			err = emit.Int(script, int64(len(slice)))
 			if err != nil {
 				return nil, err
 			}
-			err = vm.EmitOpcode(script, opcode.PACK)
+			err = emit.Opcode(script, opcode.PACK)
 			if err != nil {
 				return nil, err
 			}
 		}
 	}
 
-	if err := vm.EmitAppCall(script, contract, false); err != nil {
+	if err := emit.AppCall(script, contract, false); err != nil {
 		return nil, err
 	}
 	return script.Bytes(), nil
@@ -298,7 +298,7 @@ func CreateInvocationScript(contract util.Uint160, funcParams []Param) ([]byte,
 	if err != nil {
 		return nil, err
 	}
-	if err = vm.EmitAppCall(script, contract, false); err != nil {
+	if err = emit.AppCall(script, contract, false); err != nil {
 		return nil, err
 	}
 	return script.Bytes(), nil

pkg/smartcontract/contract.go

@@ -6,7 +6,7 @@ import (
 	"sort"
 
 	"github.com/CityOfZion/neo-go/pkg/crypto/keys"
-	"github.com/CityOfZion/neo-go/pkg/vm"
+	"github.com/CityOfZion/neo-go/pkg/vm/emit"
 	"github.com/CityOfZion/neo-go/pkg/vm/opcode"
 )
 
@@ -23,19 +23,19 @@ func CreateMultiSigRedeemScript(m int, publicKeys keys.PublicKeys) ([]byte, erro
 	}
 
 	buf := new(bytes.Buffer)
-	if err := vm.EmitInt(buf, int64(m)); err != nil {
+	if err := emit.Int(buf, int64(m)); err != nil {
 		return nil, err
 	}
 	sort.Sort(publicKeys)
 	for _, pubKey := range publicKeys {
-		if err := vm.EmitBytes(buf, pubKey.Bytes()); err != nil {
+		if err := emit.Bytes(buf, pubKey.Bytes()); err != nil {
 			return nil, err
 		}
 	}
-	if err := vm.EmitInt(buf, int64(len(publicKeys))); err != nil {
+	if err := emit.Int(buf, int64(len(publicKeys))); err != nil {
 		return nil, err
 	}
-	if err := vm.EmitOpcode(buf, opcode.CHECKMULTISIG); err != nil {
+	if err := emit.Opcode(buf, opcode.CHECKMULTISIG); err != nil {
 		return nil, err
 	}
 

pkg/vm/emit.go

@@ -1,151 +0,0 @@
-package vm
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"io"
-	"math/big"
-
-	"github.com/CityOfZion/neo-go/pkg/util"
-	"github.com/CityOfZion/neo-go/pkg/vm/opcode"
-)
-
-// Emit a VM Instruction with data to the given buffer.
-func Emit(w *bytes.Buffer, op opcode.Opcode, b []byte) error {
-	if err := w.WriteByte(byte(op)); err != nil {
-		return err
-	}
-	_, err := w.Write(b)
-	return err
-}
-
-// EmitOpcode emits a single VM Instruction the given buffer.
-func EmitOpcode(w io.ByteWriter, op opcode.Opcode) error {
-	return w.WriteByte(byte(op))
-}
-
-// EmitBool emits a bool type the given buffer.
-func EmitBool(w io.ByteWriter, ok bool) error {
-	if ok {
-		return EmitOpcode(w, opcode.PUSHT)
-	}
-	return EmitOpcode(w, opcode.PUSHF)
-}
-
-// EmitInt emits a int type to the given buffer.
-func EmitInt(w *bytes.Buffer, i int64) error {
-	if i == -1 {
-		return EmitOpcode(w, opcode.PUSHM1)
-	}
-	if i == 0 {
-		return EmitOpcode(w, opcode.PUSHF)
-	}
-	if i > 0 && i < 16 {
-		val := opcode.Opcode(int(opcode.PUSH1) - 1 + int(i))
-		return EmitOpcode(w, val)
-	}
-
-	bInt := big.NewInt(i)
-	val := util.ArrayReverse(bInt.Bytes())
-	return EmitBytes(w, val)
-}
-
-// EmitString emits a string to the given buffer.
-func EmitString(w *bytes.Buffer, s string) error {
-	return EmitBytes(w, []byte(s))
-}
-
-// EmitBytes emits a byte array to the given buffer.
-func EmitBytes(w *bytes.Buffer, b []byte) error {
-	var (
-		err error
-		n   = len(b)
-	)
-
-	if n <= int(opcode.PUSHBYTES75) {
-		return Emit(w, opcode.Opcode(n), b)
-	} else if n < 0x100 {
-		err = Emit(w, opcode.PUSHDATA1, []byte{byte(n)})
-	} else if n < 0x10000 {
-		buf := make([]byte, 2)
-		binary.LittleEndian.PutUint16(buf, uint16(n))
-		err = Emit(w, opcode.PUSHDATA2, buf)
-	} else {
-		buf := make([]byte, 4)
-		binary.LittleEndian.PutUint32(buf, uint32(n))
-		err = Emit(w, opcode.PUSHDATA4, buf)
-	}
-	if err != nil {
-		return err
-	}
-	_, err = w.Write(b)
-	return err
-}
-
-// EmitSyscall emits the syscall API to the given buffer.
-// Syscall API string cannot be 0.
-func EmitSyscall(w *bytes.Buffer, api string) error {
-	if len(api) == 0 {
-		return errors.New("syscall api cannot be of length 0")
-	}
-	buf := make([]byte, len(api)+1)
-	buf[0] = byte(len(api))
-	copy(buf[1:], api)
-	return Emit(w, opcode.SYSCALL, buf)
-}
-
-// EmitCall emits a call Instruction with label to the given buffer.
-func EmitCall(w *bytes.Buffer, op opcode.Opcode, label int16) error {
-	return EmitJmp(w, op, label)
-}
-
-// EmitJmp emits a jump Instruction along with label to the given buffer.
-func EmitJmp(w *bytes.Buffer, op opcode.Opcode, label int16) error {
-	if !isInstructionJmp(op) {
-		return fmt.Errorf("opcode %s is not a jump or call type", op.String())
-	}
-	buf := make([]byte, 2)
-	binary.LittleEndian.PutUint16(buf, uint16(label))
-	return Emit(w, op, buf)
-}
-
-// EmitAppCall emits an appcall, if tailCall is true, tailCall opcode will be
-// emitted instead.
-func EmitAppCall(w *bytes.Buffer, scriptHash util.Uint160, tailCall bool) error {
-	op := opcode.APPCALL
-	if tailCall {
-		op = opcode.TAILCALL
-	}
-	return Emit(w, op, scriptHash.BytesBE())
-}
-
-// EmitAppCallWithOperationAndData emits an appcall with the given operation and data.
-func EmitAppCallWithOperationAndData(w *bytes.Buffer, scriptHash util.Uint160, operation string, data []byte) error {
-	if err := EmitBytes(w, data); err != nil {
-		return err
-	}
-	if err := EmitString(w, operation); err != nil {
-		return err
-	}
-	return EmitAppCall(w, scriptHash, false)
-}
-
-// EmitAppCallWithOperation emits an appcall with the given operation.
-func EmitAppCallWithOperation(w *bytes.Buffer, scriptHash util.Uint160, operation string) error {
-	if err := EmitBool(w, false); err != nil {
-		return err
-	}
-	if err := EmitString(w, operation); err != nil {
-		return err
-	}
-	return EmitAppCall(w, scriptHash, false)
-}
-
-func isInstructionJmp(op opcode.Opcode) bool {
-	if op == opcode.JMP || op == opcode.JMPIFNOT || op == opcode.JMPIF || op == opcode.CALL {
-		return true
-	}
-	return false
-}

pkg/vm/emit/emit.go

@@ -0,0 +1,151 @@
+package emit
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"math/big"
+
+	"github.com/CityOfZion/neo-go/pkg/util"
+	"github.com/CityOfZion/neo-go/pkg/vm/opcode"
+)
+
+// Instruction emits a VM Instruction with data to the given buffer.
+func Instruction(w *bytes.Buffer, op opcode.Opcode, b []byte) error {
+	if err := w.WriteByte(byte(op)); err != nil {
+		return err
+	}
+	_, err := w.Write(b)
+	return err
+}
+
+// Opcode emits a single VM Instruction without arguments to the given buffer.
+func Opcode(w io.ByteWriter, op opcode.Opcode) error {
+	return w.WriteByte(byte(op))
+}
+
+// Bool emits a bool type the given buffer.
+func Bool(w io.ByteWriter, ok bool) error {
+	if ok {
+		return Opcode(w, opcode.PUSHT)
+	}
+	return Opcode(w, opcode.PUSHF)
+}
+
+// Int emits a int type to the given buffer.
+func Int(w *bytes.Buffer, i int64) error {
+	if i == -1 {
+		return Opcode(w, opcode.PUSHM1)
+	}
+	if i == 0 {
+		return Opcode(w, opcode.PUSHF)
+	}
+	if i > 0 && i < 16 {
+		val := opcode.Opcode(int(opcode.PUSH1) - 1 + int(i))
+		return Opcode(w, val)
+	}
+
+	bInt := big.NewInt(i)
+	val := util.ArrayReverse(bInt.Bytes())
+	return Bytes(w, val)
+}
+
+// String emits a string to the given buffer.
+func String(w *bytes.Buffer, s string) error {
+	return Bytes(w, []byte(s))
+}
+
+// Bytes emits a byte array to the given buffer.
+func Bytes(w *bytes.Buffer, b []byte) error {
+	var (
+		err error
+		n   = len(b)
+	)
+
+	if n <= int(opcode.PUSHBYTES75) {
+		return Instruction(w, opcode.Opcode(n), b)
+	} else if n < 0x100 {
+		err = Instruction(w, opcode.PUSHDATA1, []byte{byte(n)})
+	} else if n < 0x10000 {
+		buf := make([]byte, 2)
+		binary.LittleEndian.PutUint16(buf, uint16(n))
+		err = Instruction(w, opcode.PUSHDATA2, buf)
+	} else {
+		buf := make([]byte, 4)
+		binary.LittleEndian.PutUint32(buf, uint32(n))
+		err = Instruction(w, opcode.PUSHDATA4, buf)
+	}
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(b)
+	return err
+}
+
+// Syscall emits the syscall API to the given buffer.
+// Syscall API string cannot be 0.
+func Syscall(w *bytes.Buffer, api string) error {
+	if len(api) == 0 {
+		return errors.New("syscall api cannot be of length 0")
+	}
+	buf := make([]byte, len(api)+1)
+	buf[0] = byte(len(api))
+	copy(buf[1:], api)
+	return Instruction(w, opcode.SYSCALL, buf)
+}
+
+// Call emits a call Instruction with label to the given buffer.
+func Call(w *bytes.Buffer, op opcode.Opcode, label int16) error {
+	return Jmp(w, op, label)
+}
+
+// Jmp emits a jump Instruction along with label to the given buffer.
+func Jmp(w *bytes.Buffer, op opcode.Opcode, label int16) error {
+	if !isInstructionJmp(op) {
+		return fmt.Errorf("opcode %s is not a jump or call type", op.String())
+	}
+	buf := make([]byte, 2)
+	binary.LittleEndian.PutUint16(buf, uint16(label))
+	return Instruction(w, op, buf)
+}
+
+// AppCall emits an appcall, if tailCall is true, tailCall opcode will be
+// emitted instead.
+func AppCall(w *bytes.Buffer, scriptHash util.Uint160, tailCall bool) error {
+	op := opcode.APPCALL
+	if tailCall {
+		op = opcode.TAILCALL
+	}
+	return Instruction(w, op, scriptHash.BytesBE())
+}
+
+// AppCallWithOperationAndData emits an appcall with the given operation and data.
+func AppCallWithOperationAndData(w *bytes.Buffer, scriptHash util.Uint160, operation string, data []byte) error {
+	if err := Bytes(w, data); err != nil {
+		return err
+	}
+	if err := String(w, operation); err != nil {
+		return err
+	}
+	return AppCall(w, scriptHash, false)
+}
+
+// AppCallWithOperation emits an appcall with the given operation.
+func AppCallWithOperation(w *bytes.Buffer, scriptHash util.Uint160, operation string) error {
+	if err := Bool(w, false); err != nil {
+		return err
+	}
+	if err := String(w, operation); err != nil {
+		return err
+	}
+	return AppCall(w, scriptHash, false)
+}
+
+func isInstructionJmp(op opcode.Opcode) bool {
+	if op == opcode.JMP || op == opcode.JMPIFNOT || op == opcode.JMPIF || op == opcode.CALL {
+		return true
+	}
+	return false
+}

pkg/vm/emit/emit_test.go

@@ -1,4 +1,4 @@
-package vm
+package emit
 
 import (
 	"bytes"
@@ -11,22 +11,22 @@ import (
 
 func TestEmitInt(t *testing.T) {
 	buf := new(bytes.Buffer)
-	EmitInt(buf, 10)
+	Int(buf, 10)
 	assert.Equal(t, opcode.Opcode(buf.Bytes()[0]), opcode.PUSH10)
 	buf.Reset()
-	EmitInt(buf, 100)
+	Int(buf, 100)
 	assert.Equal(t, buf.Bytes()[0], uint8(1))
 	assert.Equal(t, buf.Bytes()[1], uint8(100))
 	buf.Reset()
-	EmitInt(buf, 1000)
+	Int(buf, 1000)
 	assert.Equal(t, buf.Bytes()[0], uint8(2))
 	assert.Equal(t, buf.Bytes()[1:3], []byte{0xe8, 0x03})
 }
 
 func TestEmitBool(t *testing.T) {
 	buf := new(bytes.Buffer)
-	EmitBool(buf, true)
+	Bool(buf, true)
-	EmitBool(buf, false)
+	Bool(buf, false)
 	assert.Equal(t, opcode.Opcode(buf.Bytes()[0]), opcode.PUSH1)
 	assert.Equal(t, opcode.Opcode(buf.Bytes()[1]), opcode.PUSH0)
 }
@@ -34,7 +34,7 @@ func TestEmitBool(t *testing.T) {
 func TestEmitString(t *testing.T) {
 	buf := new(bytes.Buffer)
 	str := "City Of Zion"
-	EmitString(buf, str)
+	String(buf, str)
 	assert.Equal(t, buf.Len(), len(str)+1)
 	assert.Equal(t, buf.Bytes()[1:], []byte(str))
 }
@@ -48,7 +48,7 @@ func TestEmitSyscall(t *testing.T) {
 
 	buf := new(bytes.Buffer)
 	for _, syscall := range syscalls {
-		EmitSyscall(buf, syscall)
+		Syscall(buf, syscall)
 		assert.Equal(t, opcode.Opcode(buf.Bytes()[0]), opcode.SYSCALL)
 		assert.Equal(t, buf.Bytes()[1], uint8(len(syscall)))
 		assert.Equal(t, buf.Bytes()[2:], []byte(syscall))
@@ -58,7 +58,7 @@ func TestEmitSyscall(t *testing.T) {
 
 func TestEmitCall(t *testing.T) {
 	buf := new(bytes.Buffer)
-	EmitCall(buf, opcode.JMP, 100)
+	Call(buf, opcode.JMP, 100)
 	assert.Equal(t, opcode.Opcode(buf.Bytes()[0]), opcode.JMP)
 	label := binary.LittleEndian.Uint16(buf.Bytes()[1:3])
 	assert.Equal(t, label, uint16(100))

pkg/vm/vm_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/CityOfZion/neo-go/pkg/crypto/hash"
 	"github.com/CityOfZion/neo-go/pkg/crypto/keys"
 	"github.com/CityOfZion/neo-go/pkg/util"
+	"github.com/CityOfZion/neo-go/pkg/vm/emit"
 	"github.com/CityOfZion/neo-go/pkg/vm/opcode"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -31,8 +32,8 @@ func TestInteropHook(t *testing.T) {
 	v.RegisterInteropGetter(fooInteropGetter)
 
 	buf := new(bytes.Buffer)
-	EmitSyscall(buf, "foo")
+	emit.Syscall(buf, "foo")
-	EmitOpcode(buf, opcode.RET)
+	emit.Opcode(buf, opcode.RET)
 	v.Load(buf.Bytes())
 	runVM(t, v)
 	assert.Equal(t, 1, v.estack.Len())
@@ -47,8 +48,8 @@ func TestInteropHookViaID(t *testing.T) {
 	fooid := InteropNameToID([]byte("foo"))
 	var id = make([]byte, 4)
 	binary.LittleEndian.PutUint32(id, fooid)
-	_ = EmitSyscall(buf, string(id))
+	_ = emit.Syscall(buf, string(id))
-	_ = EmitOpcode(buf, opcode.RET)
+	_ = emit.Opcode(buf, opcode.RET)
 	v.Load(buf.Bytes())
 	runVM(t, v)
 	assert.Equal(t, 1, v.estack.Len())
@@ -133,7 +134,7 @@ func TestPushBytes1to75(t *testing.T) {
 	buf := new(bytes.Buffer)
 	for i := 1; i <= 75; i++ {
 		b := randomBytes(i)
-		EmitBytes(buf, b)
+		emit.Bytes(buf, b)
 		vm := load(buf.Bytes())
 		err := vm.Step()
 		require.NoError(t, err)