neo-go/pkg/vm/vm_test.go
2019-09-16 15:50:51 +03:00

1457 lines
36 KiB
Go

package vm
import (
"bytes"
"encoding/hex"
"math/big"
"math/rand"
"testing"
"github.com/CityOfZion/neo-go/pkg/util"
"github.com/stretchr/testify/assert"
)
func TestInteropHook(t *testing.T) {
v := New(ModeMute)
v.RegisterInteropFunc("foo", func(evm *VM) error {
evm.Estack().PushVal(1)
return nil
})
buf := new(bytes.Buffer)
EmitSyscall(buf, "foo")
EmitOpcode(buf, RET)
v.Load(buf.Bytes())
v.Run()
assert.Equal(t, false, v.state.HasFlag(faultState))
assert.Equal(t, 1, v.estack.Len())
assert.Equal(t, big.NewInt(1), v.estack.Pop().value.Value())
}
func TestRegisterInterop(t *testing.T) {
v := New(ModeMute)
currRegistered := len(v.interop)
v.RegisterInteropFunc("foo", func(evm *VM) error { return nil })
assert.Equal(t, currRegistered+1, len(v.interop))
_, ok := v.interop["foo"]
assert.Equal(t, true, ok)
}
func TestPushBytes1to75(t *testing.T) {
buf := new(bytes.Buffer)
for i := 1; i <= 75; i++ {
b := randomBytes(i)
EmitBytes(buf, b)
vm := load(buf.Bytes())
vm.Step()
assert.Equal(t, 1, vm.estack.Len())
elem := vm.estack.Pop()
assert.IsType(t, &ByteArrayItem{}, elem.value)
assert.IsType(t, elem.Bytes(), b)
assert.Equal(t, 0, vm.estack.Len())
vm.execute(nil, RET)
assert.Equal(t, 0, vm.astack.Len())
assert.Equal(t, 0, vm.istack.Len())
buf.Reset()
}
}
func TestPushBytesNoParam(t *testing.T) {
prog := make([]byte, 1)
prog[0] = byte(PUSHBYTES1)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushBytesShort(t *testing.T) {
prog := make([]byte, 10)
prog[0] = byte(PUSHBYTES10) // but only 9 left in the `prog`
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushm1to16(t *testing.T) {
var prog []byte
for i := int(PUSHM1); i <= int(PUSH16); i++ {
if i == 80 {
continue // opcode layout we got here.
}
prog = append(prog, byte(i))
}
vm := load(prog)
for i := int(PUSHM1); i <= int(PUSH16); i++ {
if i == 80 {
continue // nice opcode layout we got here.
}
vm.Step()
elem := vm.estack.Pop()
assert.IsType(t, &BigIntegerItem{}, elem.value)
val := i - int(PUSH1) + 1
assert.Equal(t, elem.BigInt().Int64(), int64(val))
}
}
func TestPushData1BadNoN(t *testing.T) {
prog := []byte{byte(PUSHDATA1)}
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushData1BadN(t *testing.T) {
prog := []byte{byte(PUSHDATA1), 1}
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushData1Good(t *testing.T) {
prog := makeProgram(PUSHDATA1, 3, 1, 2, 3)
vm := load(prog)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []byte{1, 2, 3}, vm.estack.Pop().Bytes())
}
func TestPushData2BadNoN(t *testing.T) {
prog := []byte{byte(PUSHDATA2)}
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushData2ShortN(t *testing.T) {
prog := []byte{byte(PUSHDATA2), 0}
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushData2BadN(t *testing.T) {
prog := []byte{byte(PUSHDATA2), 1, 0}
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushData2Good(t *testing.T) {
prog := makeProgram(PUSHDATA2, 3, 0, 1, 2, 3)
vm := load(prog)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []byte{1, 2, 3}, vm.estack.Pop().Bytes())
}
func TestPushData4BadNoN(t *testing.T) {
prog := []byte{byte(PUSHDATA4)}
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushData4BadN(t *testing.T) {
prog := []byte{byte(PUSHDATA4), 1, 0, 0, 0}
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushData4ShortN(t *testing.T) {
prog := []byte{byte(PUSHDATA4), 0, 0, 0}
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPushData4Good(t *testing.T) {
prog := makeProgram(PUSHDATA4, 3, 0, 0, 0, 1, 2, 3)
vm := load(prog)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []byte{1, 2, 3}, vm.estack.Pop().Bytes())
}
func TestNOTNoArgument(t *testing.T) {
prog := makeProgram(NOT)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestNOTBool(t *testing.T) {
prog := makeProgram(NOT)
vm := load(prog)
vm.estack.PushVal(false)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, &BoolItem{true}, vm.estack.Pop().value)
}
func TestNOTNonZeroInt(t *testing.T) {
prog := makeProgram(NOT)
vm := load(prog)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, &BoolItem{false}, vm.estack.Pop().value)
}
func TestNOTArray(t *testing.T) {
prog := makeProgram(NOT)
vm := load(prog)
vm.estack.PushVal([]StackItem{})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, &BoolItem{false}, vm.estack.Pop().value)
}
func TestNOTStruct(t *testing.T) {
prog := makeProgram(NOT)
vm := load(prog)
vm.estack.Push(NewElement(&StructItem{[]StackItem{}}))
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, &BoolItem{false}, vm.estack.Pop().value)
}
func TestNOTByteArray0(t *testing.T) {
prog := makeProgram(NOT)
vm := load(prog)
vm.estack.PushVal([]byte{0, 0})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, &BoolItem{true}, vm.estack.Pop().value)
}
func TestNOTByteArray1(t *testing.T) {
prog := makeProgram(NOT)
vm := load(prog)
vm.estack.PushVal([]byte{0, 1})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, &BoolItem{false}, vm.estack.Pop().value)
}
func TestAdd(t *testing.T) {
prog := makeProgram(ADD)
vm := load(prog)
vm.estack.PushVal(4)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(6), vm.estack.Pop().BigInt().Int64())
}
func TestMul(t *testing.T) {
prog := makeProgram(MUL)
vm := load(prog)
vm.estack.PushVal(4)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(8), vm.estack.Pop().BigInt().Int64())
}
func TestDiv(t *testing.T) {
prog := makeProgram(DIV)
vm := load(prog)
vm.estack.PushVal(4)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(2), vm.estack.Pop().BigInt().Int64())
}
func TestSub(t *testing.T) {
prog := makeProgram(SUB)
vm := load(prog)
vm.estack.PushVal(4)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(2), vm.estack.Pop().BigInt().Int64())
}
func TestSHRGood(t *testing.T) {
prog := makeProgram(SHR)
vm := load(prog)
vm.estack.PushVal(4)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem(1), vm.estack.Pop().value)
}
func TestSHRZero(t *testing.T) {
prog := makeProgram(SHR)
vm := load(prog)
vm.estack.PushVal([]byte{0, 1})
vm.estack.PushVal(0)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem([]byte{0, 1}), vm.estack.Pop().value)
}
func TestSHLGood(t *testing.T) {
prog := makeProgram(SHL)
vm := load(prog)
vm.estack.PushVal(4)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem(16), vm.estack.Pop().value)
}
func TestSHLZero(t *testing.T) {
prog := makeProgram(SHL)
vm := load(prog)
vm.estack.PushVal([]byte{0, 1})
vm.estack.PushVal(0)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem([]byte{0, 1}), vm.estack.Pop().value)
}
func TestLT(t *testing.T) {
prog := makeProgram(LT)
vm := load(prog)
vm.estack.PushVal(4)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, false, vm.estack.Pop().Bool())
}
func TestLTE(t *testing.T) {
prog := makeProgram(LTE)
vm := load(prog)
vm.estack.PushVal(2)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, true, vm.estack.Pop().Bool())
}
func TestGT(t *testing.T) {
prog := makeProgram(GT)
vm := load(prog)
vm.estack.PushVal(9)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, true, vm.estack.Pop().Bool())
}
func TestGTE(t *testing.T) {
prog := makeProgram(GTE)
vm := load(prog)
vm.estack.PushVal(3)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, true, vm.estack.Pop().Bool())
}
func TestDepth(t *testing.T) {
prog := makeProgram(DEPTH)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(3), vm.estack.Pop().BigInt().Int64())
}
func TestEQUALNoArguments(t *testing.T) {
prog := makeProgram(EQUAL)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestEQUALBad1Argument(t *testing.T) {
prog := makeProgram(EQUAL)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestEQUALGoodInteger(t *testing.T) {
prog := makeProgram(EQUAL)
vm := load(prog)
vm.estack.PushVal(5)
vm.estack.PushVal(5)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &BoolItem{true}, vm.estack.Pop().value)
}
func TestNumEqual(t *testing.T) {
prog := makeProgram(NUMEQUAL)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, false, vm.estack.Pop().Bool())
}
func TestNumNotEqual(t *testing.T) {
prog := makeProgram(NUMNOTEQUAL)
vm := load(prog)
vm.estack.PushVal(2)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, false, vm.estack.Pop().Bool())
}
func TestINC(t *testing.T) {
prog := makeProgram(INC)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, big.NewInt(2), vm.estack.Pop().BigInt())
}
func TestNEWARRAYInteger(t *testing.T) {
prog := makeProgram(NEWARRAY)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &ArrayItem{[]StackItem{makeStackItem(false)}}, vm.estack.Pop().value)
}
func TestNEWARRAYStruct(t *testing.T) {
prog := makeProgram(NEWARRAY)
vm := load(prog)
arr := []StackItem{makeStackItem(42)}
vm.estack.Push(&Element{value: &StructItem{arr}})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &ArrayItem{arr}, vm.estack.Pop().value)
}
func TestNEWARRAYArray(t *testing.T) {
prog := makeProgram(NEWARRAY)
vm := load(prog)
arr := []StackItem{makeStackItem(42)}
vm.estack.Push(&Element{value: &ArrayItem{arr}})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &ArrayItem{arr}, vm.estack.Pop().value)
}
func TestNEWARRAYByteArray(t *testing.T) {
prog := makeProgram(NEWARRAY)
vm := load(prog)
vm.estack.PushVal([]byte{})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &ArrayItem{[]StackItem{}}, vm.estack.Pop().value)
}
func TestNEWSTRUCTInteger(t *testing.T) {
prog := makeProgram(NEWSTRUCT)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &StructItem{[]StackItem{makeStackItem(false)}}, vm.estack.Pop().value)
}
func TestNEWSTRUCTArray(t *testing.T) {
prog := makeProgram(NEWSTRUCT)
vm := load(prog)
arr := []StackItem{makeStackItem(42)}
vm.estack.Push(&Element{value: &ArrayItem{arr}})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &StructItem{arr}, vm.estack.Pop().value)
}
func TestNEWSTRUCTStruct(t *testing.T) {
prog := makeProgram(NEWSTRUCT)
vm := load(prog)
arr := []StackItem{makeStackItem(42)}
vm.estack.Push(&Element{value: &StructItem{arr}})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &StructItem{arr}, vm.estack.Pop().value)
}
func TestNEWSTRUCTByteArray(t *testing.T) {
prog := makeProgram(NEWSTRUCT)
vm := load(prog)
vm.estack.PushVal([]byte{})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &StructItem{[]StackItem{}}, vm.estack.Pop().value)
}
func TestAPPENDArray(t *testing.T) {
prog := makeProgram(DUP, PUSH5, APPEND)
vm := load(prog)
vm.estack.Push(&Element{value: &ArrayItem{}})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &ArrayItem{[]StackItem{makeStackItem(5)}}, vm.estack.Pop().value)
}
func TestAPPENDStruct(t *testing.T) {
prog := makeProgram(DUP, PUSH5, APPEND)
vm := load(prog)
vm.estack.Push(&Element{value: &StructItem{}})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &StructItem{[]StackItem{makeStackItem(5)}}, vm.estack.Pop().value)
}
func TestAPPENDBadNoArguments(t *testing.T) {
prog := makeProgram(APPEND)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestAPPENDBad1Argument(t *testing.T) {
prog := makeProgram(APPEND)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestAPPENDWrongType(t *testing.T) {
prog := makeProgram(APPEND)
vm := load(prog)
vm.estack.PushVal([]byte{})
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPICKITEMBadIndex(t *testing.T) {
prog := makeProgram(PICKITEM)
vm := load(prog)
vm.estack.PushVal([]StackItem{})
vm.estack.PushVal(0)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPICKITEMArray(t *testing.T) {
prog := makeProgram(PICKITEM)
vm := load(prog)
vm.estack.PushVal([]StackItem{makeStackItem(1), makeStackItem(2)})
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem(2), vm.estack.Pop().value)
}
func TestPICKITEMByteArray(t *testing.T) {
prog := makeProgram(PICKITEM)
vm := load(prog)
vm.estack.PushVal([]byte{1, 2})
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem(2), vm.estack.Pop().value)
}
func TestSIZENoArgument(t *testing.T) {
prog := makeProgram(SIZE)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSIZEByteArray(t *testing.T) {
prog := makeProgram(SIZE)
vm := load(prog)
vm.estack.PushVal([]byte{0, 1})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem(2), vm.estack.Pop().value)
}
func TestSIZEBool(t *testing.T) {
prog := makeProgram(SIZE)
vm := load(prog)
vm.estack.PushVal(false)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem(1), vm.estack.Pop().value)
}
func TestSIGNNoArgument(t *testing.T) {
prog := makeProgram(SIGN)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSIGNWrongType(t *testing.T) {
prog := makeProgram(SIGN)
vm := load(prog)
vm.estack.PushVal([]StackItem{})
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSIGNBool(t *testing.T) {
prog := makeProgram(SIGN)
vm := load(prog)
vm.estack.PushVal(false)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &BigIntegerItem{big.NewInt(0)}, vm.estack.Pop().value)
}
func TestSIGNPositiveInt(t *testing.T) {
prog := makeProgram(SIGN)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &BigIntegerItem{big.NewInt(1)}, vm.estack.Pop().value)
}
func TestSIGNNegativeInt(t *testing.T) {
prog := makeProgram(SIGN)
vm := load(prog)
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &BigIntegerItem{big.NewInt(-1)}, vm.estack.Pop().value)
}
func TestSIGNZero(t *testing.T) {
prog := makeProgram(SIGN)
vm := load(prog)
vm.estack.PushVal(0)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &BigIntegerItem{big.NewInt(0)}, vm.estack.Pop().value)
}
func TestSIGNByteArray(t *testing.T) {
prog := makeProgram(SIGN)
vm := load(prog)
vm.estack.PushVal([]byte{0, 1})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &BigIntegerItem{big.NewInt(1)}, vm.estack.Pop().value)
}
func TestAppCall(t *testing.T) {
prog := []byte{byte(APPCALL)}
hash := util.Uint160{}
prog = append(prog, hash.Bytes()...)
prog = append(prog, byte(RET))
vm := load(prog)
vm.scripts[hash] = makeProgram(DEPTH)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
elem := vm.estack.Pop() // depth should be 1
assert.Equal(t, int64(1), elem.BigInt().Int64())
}
func TestSimpleCall(t *testing.T) {
progStr := "52c56b525a7c616516006c766b00527ac46203006c766b00c3616c756653c56b6c766b00527ac46c766b51527ac46203006c766b00c36c766b51c393616c7566"
result := 12
prog, err := hex.DecodeString(progStr)
if err != nil {
t.Fatal(err)
}
vm := load(prog)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, result, int(vm.estack.Pop().BigInt().Int64()))
}
func TestNZtrue(t *testing.T) {
prog := makeProgram(NZ)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, true, vm.estack.Pop().Bool())
}
func TestNZfalse(t *testing.T) {
prog := makeProgram(NZ)
vm := load(prog)
vm.estack.PushVal(0)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, false, vm.estack.Pop().Bool())
}
func TestPICKbadNoitem(t *testing.T) {
prog := makeProgram(PICK)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPICKbadNegative(t *testing.T) {
prog := makeProgram(PICK)
vm := load(prog)
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPICKgood(t *testing.T) {
prog := makeProgram(PICK)
result := 2
vm := load(prog)
vm.estack.PushVal(0)
vm.estack.PushVal(1)
vm.estack.PushVal(result)
vm.estack.PushVal(3)
vm.estack.PushVal(4)
vm.estack.PushVal(5)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(result), vm.estack.Pop().BigInt().Int64())
}
func TestROTBad(t *testing.T) {
prog := makeProgram(ROT)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestROTGood(t *testing.T) {
prog := makeProgram(ROT)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 3, vm.estack.Len())
assert.Equal(t, makeStackItem(1), vm.estack.Pop().value)
assert.Equal(t, makeStackItem(3), vm.estack.Pop().value)
assert.Equal(t, makeStackItem(2), vm.estack.Pop().value)
}
func TestXTUCKbadNoitem(t *testing.T) {
prog := makeProgram(XTUCK)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXTUCKbadNoN(t *testing.T) {
prog := makeProgram(XTUCK)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXTUCKbadNegative(t *testing.T) {
prog := makeProgram(XTUCK)
vm := load(prog)
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXTUCKbadZero(t *testing.T) {
prog := makeProgram(XTUCK)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(0)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXTUCKgood(t *testing.T) {
prog := makeProgram(XTUCK)
topelement := 5
xtuckdepth := 3
vm := load(prog)
vm.estack.PushVal(0)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.estack.PushVal(3)
vm.estack.PushVal(4)
vm.estack.PushVal(topelement)
vm.estack.PushVal(xtuckdepth)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(topelement), vm.estack.Peek(0).BigInt().Int64())
assert.Equal(t, int64(topelement), vm.estack.Peek(xtuckdepth).BigInt().Int64())
}
func TestTUCKbadNoitems(t *testing.T) {
prog := makeProgram(TUCK)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestTUCKbadNoitem(t *testing.T) {
prog := makeProgram(TUCK)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestTUCKgood(t *testing.T) {
prog := makeProgram(TUCK)
vm := load(prog)
vm.estack.PushVal(42)
vm.estack.PushVal(34)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(34), vm.estack.Peek(0).BigInt().Int64())
assert.Equal(t, int64(42), vm.estack.Peek(1).BigInt().Int64())
assert.Equal(t, int64(34), vm.estack.Peek(2).BigInt().Int64())
}
func TestTUCKgood2(t *testing.T) {
prog := makeProgram(TUCK)
vm := load(prog)
vm.estack.PushVal(11)
vm.estack.PushVal(42)
vm.estack.PushVal(34)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(34), vm.estack.Peek(0).BigInt().Int64())
assert.Equal(t, int64(42), vm.estack.Peek(1).BigInt().Int64())
assert.Equal(t, int64(34), vm.estack.Peek(2).BigInt().Int64())
assert.Equal(t, int64(11), vm.estack.Peek(3).BigInt().Int64())
}
func TestOVERbadNoitem(t *testing.T) {
prog := makeProgram(OVER)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestOVERbadNoitems(t *testing.T) {
prog := makeProgram(OVER)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestOVERgood(t *testing.T) {
prog := makeProgram(OVER)
vm := load(prog)
vm.estack.PushVal(42)
vm.estack.PushVal(34)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(42), vm.estack.Peek(0).BigInt().Int64())
assert.Equal(t, int64(34), vm.estack.Peek(1).BigInt().Int64())
assert.Equal(t, int64(42), vm.estack.Peek(2).BigInt().Int64())
assert.Equal(t, 3, vm.estack.Len())
}
func TestNIPBadNoItem(t *testing.T) {
prog := makeProgram(NIP)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestNIPGood(t *testing.T) {
prog := makeProgram(NIP)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, makeStackItem(2), vm.estack.Pop().value)
}
func TestDROPBadNoItem(t *testing.T) {
prog := makeProgram(DROP)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestDROPGood(t *testing.T) {
prog := makeProgram(DROP)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 0, vm.estack.Len())
}
func TestXDROPbadNoitem(t *testing.T) {
prog := makeProgram(XDROP)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXDROPbadNoN(t *testing.T) {
prog := makeProgram(XDROP)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXDROPbadNegative(t *testing.T) {
prog := makeProgram(XDROP)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXDROPgood(t *testing.T) {
prog := makeProgram(XDROP)
vm := load(prog)
vm.estack.PushVal(0)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
assert.Equal(t, int64(2), vm.estack.Peek(0).BigInt().Int64())
assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
}
func TestINVERTbadNoitem(t *testing.T) {
prog := makeProgram(INVERT)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestINVERTgood1(t *testing.T) {
prog := makeProgram(INVERT)
vm := load(prog)
vm.estack.PushVal(0)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(-1), vm.estack.Peek(0).BigInt().Int64())
}
func TestINVERTgood2(t *testing.T) {
prog := makeProgram(INVERT)
vm := load(prog)
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(0), vm.estack.Peek(0).BigInt().Int64())
}
func TestINVERTgood3(t *testing.T) {
prog := makeProgram(INVERT)
vm := load(prog)
vm.estack.PushVal(0x69)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, int64(-0x6A), vm.estack.Peek(0).BigInt().Int64())
}
func TestCATBadNoArgs(t *testing.T) {
prog := makeProgram(CAT)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestCATBadOneArg(t *testing.T) {
prog := makeProgram(CAT)
vm := load(prog)
vm.estack.PushVal([]byte("abc"))
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestCATGood(t *testing.T) {
prog := makeProgram(CAT)
vm := load(prog)
vm.estack.PushVal([]byte("abc"))
vm.estack.PushVal([]byte("def"))
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []byte("abcdef"), vm.estack.Peek(0).Bytes())
}
func TestCATInt0ByteArray(t *testing.T) {
prog := makeProgram(CAT)
vm := load(prog)
vm.estack.PushVal(0)
vm.estack.PushVal([]byte{})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &ByteArrayItem{[]byte{}}, vm.estack.Pop().value)
}
func TestCATByteArrayInt1(t *testing.T) {
prog := makeProgram(CAT)
vm := load(prog)
vm.estack.PushVal([]byte{})
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, &ByteArrayItem{[]byte{1}}, vm.estack.Pop().value)
}
func TestSUBSTRBadNoArgs(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSUBSTRBadOneArg(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSUBSTRBadTwoArgs(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
vm.estack.PushVal(0)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSUBSTRGood(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []byte("bc"), vm.estack.Peek(0).Bytes())
}
func TestSUBSTRBadOffset(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(6)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSUBSTRBadLen(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(1)
vm.estack.PushVal(6)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSUBSTRBad387(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
b := make([]byte, 6, 20)
copy(b, "abcdef")
vm.estack.PushVal(b)
vm.estack.PushVal(1)
vm.estack.PushVal(6)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSUBSTRBadNegativeOffset(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(-1)
vm.estack.PushVal(3)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestSUBSTRBadNegativeLen(t *testing.T) {
prog := makeProgram(SUBSTR)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(3)
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestLEFTBadNoArgs(t *testing.T) {
prog := makeProgram(LEFT)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestLEFTBadNoString(t *testing.T) {
prog := makeProgram(LEFT)
vm := load(prog)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestLEFTBadNegativeLen(t *testing.T) {
prog := makeProgram(LEFT)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestLEFTGood(t *testing.T) {
prog := makeProgram(LEFT)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []byte("ab"), vm.estack.Peek(0).Bytes())
}
func TestLEFTGoodLen(t *testing.T) {
prog := makeProgram(LEFT)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(8)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []byte("abcdef"), vm.estack.Peek(0).Bytes())
}
func TestRIGHTBadNoArgs(t *testing.T) {
prog := makeProgram(RIGHT)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestRIGHTBadNoString(t *testing.T) {
prog := makeProgram(RIGHT)
vm := load(prog)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestRIGHTBadNegativeLen(t *testing.T) {
prog := makeProgram(RIGHT)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestRIGHTGood(t *testing.T) {
prog := makeProgram(RIGHT)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []byte("ef"), vm.estack.Peek(0).Bytes())
}
func TestRIGHTBadLen(t *testing.T) {
prog := makeProgram(RIGHT)
vm := load(prog)
vm.estack.PushVal([]byte("abcdef"))
vm.estack.PushVal(8)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPACKBadLen(t *testing.T) {
prog := makeProgram(PACK)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestPACKGoodZeroLen(t *testing.T) {
prog := makeProgram(PACK)
vm := load(prog)
vm.estack.PushVal(0)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 1, vm.estack.Len())
assert.Equal(t, []StackItem{}, vm.estack.Peek(0).Array())
}
func TestPACKGood(t *testing.T) {
prog := makeProgram(PACK)
elements := []int{55, 34, 42}
vm := load(prog)
// canary
vm.estack.PushVal(1)
for i := len(elements) - 1; i >= 0; i-- {
vm.estack.PushVal(elements[i])
}
vm.estack.PushVal(len(elements))
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
a := vm.estack.Peek(0).Array()
assert.Equal(t, len(elements), len(a))
for i := 0; i < len(elements); i++ {
e := a[i].Value().(*big.Int)
assert.Equal(t, int64(elements[i]), e.Int64())
}
assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
}
func TestUNPACKBadNotArray(t *testing.T) {
prog := makeProgram(UNPACK)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestUNPACKGood(t *testing.T) {
prog := makeProgram(UNPACK)
elements := []int{55, 34, 42}
vm := load(prog)
// canary
vm.estack.PushVal(1)
vm.estack.PushVal(elements)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 5, vm.estack.Len())
assert.Equal(t, int64(len(elements)), vm.estack.Peek(0).BigInt().Int64())
for k, v := range elements {
assert.Equal(t, int64(v), vm.estack.Peek(k+1).BigInt().Int64())
}
assert.Equal(t, int64(1), vm.estack.Peek(len(elements)+1).BigInt().Int64())
}
func TestREVERSEBadNotArray(t *testing.T) {
prog := makeProgram(REVERSE)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREVERSEGoodOneElem(t *testing.T) {
prog := makeProgram(DUP, REVERSE)
elements := []int{22}
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(elements)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
a := vm.estack.Peek(0).Array()
assert.Equal(t, len(elements), len(a))
e := a[0].Value().(*big.Int)
assert.Equal(t, int64(elements[0]), e.Int64())
}
func TestREVERSEGoodStruct(t *testing.T) {
eodd := []int{22, 34, 42, 55, 81}
even := []int{22, 34, 42, 55, 81, 99}
eall := [][]int{eodd, even}
for _, elements := range eall {
prog := makeProgram(DUP, REVERSE)
vm := load(prog)
vm.estack.PushVal(1)
arr := make([]StackItem, len(elements))
for i := range elements {
arr[i] = makeStackItem(elements[i])
}
vm.estack.Push(&Element{value: &StructItem{arr}})
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
a := vm.estack.Peek(0).Array()
assert.Equal(t, len(elements), len(a))
for k, v := range elements {
e := a[len(a)-1-k].Value().(*big.Int)
assert.Equal(t, int64(v), e.Int64())
}
assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
}
}
func TestREVERSEGood(t *testing.T) {
eodd := []int{22, 34, 42, 55, 81}
even := []int{22, 34, 42, 55, 81, 99}
eall := [][]int{eodd, even}
for _, elements := range eall {
prog := makeProgram(DUP, REVERSE)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(elements)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
a := vm.estack.Peek(0).Array()
assert.Equal(t, len(elements), len(a))
for k, v := range elements {
e := a[len(a)-1-k].Value().(*big.Int)
assert.Equal(t, int64(v), e.Int64())
}
assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
}
}
func TestREMOVEBadNoArgs(t *testing.T) {
prog := makeProgram(REMOVE)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREMOVEBadOneArg(t *testing.T) {
prog := makeProgram(REMOVE)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREMOVEBadNotArray(t *testing.T) {
prog := makeProgram(REMOVE)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREMOVEBadIndex(t *testing.T) {
prog := makeProgram(REMOVE)
elements := []int{22, 34, 42, 55, 81}
vm := load(prog)
vm.estack.PushVal(elements)
vm.estack.PushVal(10)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREMOVEGood(t *testing.T) {
prog := makeProgram(DUP, PUSH2, REMOVE)
elements := []int{22, 34, 42, 55, 81}
reselements := []int{22, 34, 55, 81}
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(elements)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
assert.Equal(t, makeStackItem(reselements), vm.estack.Pop().value)
assert.Equal(t, makeStackItem(1), vm.estack.Pop().value)
}
func makeProgram(opcodes ...Instruction) []byte {
prog := make([]byte, len(opcodes)+1) // RET
for i := 0; i < len(opcodes); i++ {
prog[i] = byte(opcodes[i])
}
prog[len(prog)-1] = byte(RET)
return prog
}
func load(prog []byte) *VM {
vm := New(ModeMute)
vm.mute = true
vm.istack.PushVal(NewContext(prog))
return vm
}
func randomBytes(n int) []byte {
const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
b := make([]byte, n)
for i := range b {
b[i] = charset[rand.Intn(len(charset))]
}
return b
}