Refactored VM to two separate VMs; std & debug

Standard VM should be about 10x faster than the debug VM. Some error
checking has been removed, all of the log statements and therefor quite
some unnecessary if-statements.

1 files changed, 872 insertions, 0 deletions

diff --git a/ethvm/vm_debug.go b/ethvm/vm_debug.go
new file mode 100644
index 000000000..8892ed6b8
--- /dev/null
+++ b/ethvm/vm_debug.go
@@ -0,0 +1,872 @@
+package ethvm
+
+import (
+	"fmt"
+	"math/big"
+
+	"github.com/ethereum/eth-go/ethcrypto"
+	"github.com/ethereum/eth-go/ethutil"
+)
+
+type DebugVm struct {
+	env Environment
+
+	logTy  byte
+	logStr string
+
+	err error
+
+	// Debugging
+	Dbg Debugger
+
+	BreakPoints []int64
+	Stepping    bool
+	Fn          string
+
+	Recoverable bool
+
+	depth int
+}
+
+func NewDebugVm(env Environment) *DebugVm {
+	lt := LogTyPretty
+	if ethutil.Config.Diff {
+		lt = LogTyDiff
+	}
+
+	return &DebugVm{env: env, logTy: lt, Recoverable: true}
+}
+
+func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
+	self.depth++
+
+	if self.Recoverable {
+		// Recover from any require exception
+		defer func() {
+			if r := recover(); r != nil {
+				ret = closure.Return(nil)
+				err = fmt.Errorf("%v", r)
+			}
+		}()
+	}
+
+	// Debug hook
+	if self.Dbg != nil {
+		self.Dbg.SetCode(closure.Code)
+	}
+
+	// Don't bother with the execution if there's no code.
+	if len(closure.Code) == 0 {
+		return closure.Return(nil), nil
+	}
+
+	vmlogger.Debugf("(%s) %x gas: %v (d) %x\n", self.Fn, closure.Address(), closure.Gas, closure.Args)
+
+	var (
+		op OpCode
+
+		mem      = &Memory{}
+		stack    = NewStack()
+		pc       = big.NewInt(0)
+		step     = 0
+		prevStep = 0
+		require  = func(m int) {
+			if stack.Len() < m {
+				panic(fmt.Sprintf("%04v (%v) stack err size = %d, required = %d", pc, op, stack.Len(), m))
+			}
+		}
+	)
+
+	for {
+		prevStep = step
+		// The base for all big integer arithmetic
+		base := new(big.Int)
+
+		step++
+		// Get the memory location of pc
+		op := OpCode(closure.Get(pc).Uint())
+
+		// XXX Leave this Println intact. Don't change this to the log system.
+		// Used for creating diffs between implementations
+		if self.logTy == LogTyDiff {
+			switch op {
+			case STOP, RETURN, SUICIDE:
+				closure.object.EachStorage(func(key string, value *ethutil.Value) {
+					value.Decode()
+					fmt.Printf("%x %x\n", new(big.Int).SetBytes([]byte(key)).Bytes(), value.Bytes())
+				})
+			}
+
+			b := pc.Bytes()
+			if len(b) == 0 {
+				b = []byte{0}
+			}
+
+			fmt.Printf("%x %x %x %x\n", closure.Address(), b, []byte{byte(op)}, closure.Gas.Bytes())
+		}
+
+		gas := new(big.Int)
+		addStepGasUsage := func(amount *big.Int) {
+			if amount.Cmp(ethutil.Big0) >= 0 {
+				gas.Add(gas, amount)
+			}
+		}
+
+		addStepGasUsage(GasStep)
+
+		var newMemSize *big.Int = ethutil.Big0
+		switch op {
+		case STOP:
+			gas.Set(ethutil.Big0)
+		case SUICIDE:
+			gas.Set(ethutil.Big0)
+		case SLOAD:
+			gas.Set(GasSLoad)
+		case SSTORE:
+			var mult *big.Int
+			y, x := stack.Peekn()
+			val := closure.GetStorage(x)
+			if val.BigInt().Cmp(ethutil.Big0) == 0 && len(y.Bytes()) > 0 {
+				mult = ethutil.Big2
+			} else if val.BigInt().Cmp(ethutil.Big0) != 0 && len(y.Bytes()) == 0 {
+				mult = ethutil.Big0
+			} else {
+				mult = ethutil.Big1
+			}
+			gas = new(big.Int).Mul(mult, GasSStore)
+		case BALANCE:
+			gas.Set(GasBalance)
+		case MSTORE:
+			require(2)
+			newMemSize = calcMemSize(stack.Peek(), u256(32))
+		case MLOAD:
+			require(1)
+
+			newMemSize = calcMemSize(stack.Peek(), u256(32))
+		case MSTORE8:
+			require(2)
+			newMemSize = calcMemSize(stack.Peek(), u256(1))
+		case RETURN:
+			require(2)
+
+			newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-2])
+		case SHA3:
+			require(2)
+
+			gas.Set(GasSha)
+
+			newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-2])
+		case CALLDATACOPY:
+			require(2)
+
+			newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-3])
+		case CODECOPY:
+			require(3)
+
+			newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-3])
+		case EXTCODECOPY:
+			require(4)
+
+			newMemSize = calcMemSize(stack.data[stack.Len()-2], stack.data[stack.Len()-4])
+		case CALL, CALLCODE:
+			require(7)
+			gas.Set(GasCall)
+			addStepGasUsage(stack.data[stack.Len()-1])
+
+			x := calcMemSize(stack.data[stack.Len()-6], stack.data[stack.Len()-7])
+			y := calcMemSize(stack.data[stack.Len()-4], stack.data[stack.Len()-5])
+
+			newMemSize = ethutil.BigMax(x, y)
+		case CREATE:
+			require(3)
+			gas.Set(GasCreate)
+
+			newMemSize = calcMemSize(stack.data[stack.Len()-2], stack.data[stack.Len()-3])
+		}
+
+		if newMemSize.Cmp(ethutil.Big0) > 0 {
+			newMemSize.Add(newMemSize, u256(31))
+			newMemSize.Div(newMemSize, u256(32))
+			newMemSize.Mul(newMemSize, u256(32))
+
+			if newMemSize.Cmp(u256(int64(mem.Len()))) > 0 {
+				memGasUsage := new(big.Int).Sub(newMemSize, u256(int64(mem.Len())))
+				memGasUsage.Mul(GasMemory, memGasUsage)
+				memGasUsage.Div(memGasUsage, u256(32))
+
+				addStepGasUsage(memGasUsage)
+			}
+		}
+
+		if !closure.UseGas(gas) {
+			err := fmt.Errorf("Insufficient gas for %v. req %v has %v", op, gas, closure.Gas)
+
+			closure.UseGas(closure.Gas)
+
+			return closure.Return(nil), err
+		}
+
+		self.Printf("(pc) %-3d -o- %-14s", pc, op.String())
+		self.Printf(" (g) %-3v (%v)", gas, closure.Gas)
+
+		mem.Resize(newMemSize.Uint64())
+
+		switch op {
+		case LOG:
+			stack.Print()
+			mem.Print()
+			// 0x20 range
+		case ADD:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v + %v", y, x)
+
+			base.Add(y, x)
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case SUB:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v - %v", y, x)
+
+			base.Sub(y, x)
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case MUL:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v * %v", y, x)
+
+			base.Mul(y, x)
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case DIV:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v / %v", y, x)
+
+			if x.Cmp(ethutil.Big0) != 0 {
+				base.Div(y, x)
+			}
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case SDIV:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v / %v", y, x)
+
+			if x.Cmp(ethutil.Big0) != 0 {
+				base.Div(y, x)
+			}
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case MOD:
+			require(2)
+			x, y := stack.Popn()
+
+			self.Printf(" %v %% %v", y, x)
+
+			base.Mod(y, x)
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+			stack.Push(base)
+		case SMOD:
+			require(2)
+			x, y := stack.Popn()
+
+			self.Printf(" %v %% %v", y, x)
+
+			base.Mod(y, x)
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+			stack.Push(base)
+
+		case EXP:
+			require(2)
+			x, y := stack.Popn()
+
+			self.Printf(" %v ** %v", y, x)
+
+			base.Exp(y, x, Pow256)
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+
+			stack.Push(base)
+		case NEG:
+			require(1)
+			base.Sub(Pow256, stack.Pop())
+			stack.Push(base)
+		case LT:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v < %v", y, x)
+			// x < y
+			if y.Cmp(x) < 0 {
+				stack.Push(ethutil.BigTrue)
+			} else {
+				stack.Push(ethutil.BigFalse)
+			}
+		case GT:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v > %v", y, x)
+
+			// x > y
+			if y.Cmp(x) > 0 {
+				stack.Push(ethutil.BigTrue)
+			} else {
+				stack.Push(ethutil.BigFalse)
+			}
+
+		case SLT:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v < %v", y, x)
+			// x < y
+			if y.Cmp(x) < 0 {
+				stack.Push(ethutil.BigTrue)
+			} else {
+				stack.Push(ethutil.BigFalse)
+			}
+		case SGT:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v > %v", y, x)
+
+			// x > y
+			if y.Cmp(x) > 0 {
+				stack.Push(ethutil.BigTrue)
+			} else {
+				stack.Push(ethutil.BigFalse)
+			}
+
+		case EQ:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v == %v", y, x)
+
+			// x == y
+			if x.Cmp(y) == 0 {
+				stack.Push(ethutil.BigTrue)
+			} else {
+				stack.Push(ethutil.BigFalse)
+			}
+		case NOT:
+			require(1)
+			x := stack.Pop()
+			if x.Cmp(ethutil.BigFalse) > 0 {
+				stack.Push(ethutil.BigFalse)
+			} else {
+				stack.Push(ethutil.BigTrue)
+			}
+
+			// 0x10 range
+		case AND:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v & %v", y, x)
+
+			stack.Push(base.And(y, x))
+		case OR:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v | %v", y, x)
+
+			stack.Push(base.Or(y, x))
+		case XOR:
+			require(2)
+			x, y := stack.Popn()
+			self.Printf(" %v ^ %v", y, x)
+
+			stack.Push(base.Xor(y, x))
+		case BYTE:
+			require(2)
+			val, th := stack.Popn()
+			if th.Cmp(big.NewInt(32)) < 0 && th.Cmp(big.NewInt(int64(len(val.Bytes())))) < 0 {
+				byt := big.NewInt(int64(ethutil.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))
+				stack.Push(byt)
+
+				self.Printf(" => 0x%x", byt.Bytes())
+			} else {
+				stack.Push(ethutil.BigFalse)
+			}
+		case ADDMOD:
+			require(3)
+
+			x := stack.Pop()
+			y := stack.Pop()
+			z := stack.Pop()
+
+			base.Add(x, y)
+			base.Mod(base, z)
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+
+			stack.Push(base)
+		case MULMOD:
+			require(3)
+
+			x := stack.Pop()
+			y := stack.Pop()
+			z := stack.Pop()
+
+			base.Mul(x, y)
+			base.Mod(base, z)
+
+			To256(base)
+
+			self.Printf(" = %v", base)
+
+			stack.Push(base)
+
+			// 0x20 range
+		case SHA3:
+			require(2)
+			size, offset := stack.Popn()
+			data := ethcrypto.Sha3(mem.Get(offset.Int64(), size.Int64()))
+
+			stack.Push(ethutil.BigD(data))
+
+			self.Printf(" => %x", data)
+			// 0x30 range
+		case ADDRESS:
+			stack.Push(ethutil.BigD(closure.Address()))
+
+			self.Printf(" => %x", closure.Address())
+		case BALANCE:
+			require(1)
+
+			addr := stack.Pop().Bytes()
+			balance := self.env.State().GetBalance(addr)
+
+			stack.Push(balance)
+
+			self.Printf(" => %v (%x)", balance, addr)
+		case ORIGIN:
+			origin := self.env.Origin()
+
+			stack.Push(ethutil.BigD(origin))
+
+			self.Printf(" => %x", origin)
+		case CALLER:
+			caller := closure.caller.Address()
+			stack.Push(ethutil.BigD(caller))
+
+			self.Printf(" => %x", caller)
+		case CALLVALUE:
+			value := self.env.Value()
+
+			stack.Push(value)
+
+			self.Printf(" => %v", value)
+		case CALLDATALOAD:
+			require(1)
+			var (
+				offset  = stack.Pop()
+				data    = make([]byte, 32)
+				lenData = big.NewInt(int64(len(closure.Args)))
+			)
+
+			if lenData.Cmp(offset) >= 0 {
+				length := new(big.Int).Add(offset, ethutil.Big32)
+				length = ethutil.BigMin(length, lenData)
+
+				copy(data, closure.Args[offset.Int64():length.Int64()])
+			}
+
+			self.Printf(" => 0x%x", data)
+
+			stack.Push(ethutil.BigD(data))
+		case CALLDATASIZE:
+			l := int64(len(closure.Args))
+			stack.Push(big.NewInt(l))
+
+			self.Printf(" => %d", l)
+		case CALLDATACOPY:
+			var (
+				size = int64(len(closure.Args))
+				mOff = stack.Pop().Int64()
+				cOff = stack.Pop().Int64()
+				l    = stack.Pop().Int64()
+			)
+
+			if cOff > size {
+				cOff = 0
+				l = 0
+			} else if cOff+l > size {
+				l = 0
+			}
+
+			code := closure.Args[cOff : cOff+l]
+
+			mem.Set(mOff, l, code)
+		case CODESIZE, EXTCODESIZE:
+			var code []byte
+			if op == EXTCODECOPY {
+				addr := stack.Pop().Bytes()
+
+				code = self.env.State().GetCode(addr)
+			} else {
+				code = closure.Code
+			}
+
+			l := big.NewInt(int64(len(code)))
+			stack.Push(l)
+
+			self.Printf(" => %d", l)
+		case CODECOPY, EXTCODECOPY:
+			var code []byte
+			if op == EXTCODECOPY {
+				addr := stack.Pop().Bytes()
+
+				code = self.env.State().GetCode(addr)
+			} else {
+				code = closure.Code
+			}
+
+			var (
+				size = int64(len(code))
+				mOff = stack.Pop().Int64()
+				cOff = stack.Pop().Int64()
+				l    = stack.Pop().Int64()
+			)
+
+			if cOff > size {
+				cOff = 0
+				l = 0
+			} else if cOff+l > size {
+				l = 0
+			}
+
+			codeCopy := code[cOff : cOff+l]
+
+			mem.Set(mOff, l, codeCopy)
+		case GASPRICE:
+			stack.Push(closure.Price)
+
+			self.Printf(" => %v", closure.Price)
+
+			// 0x40 range
+		case PREVHASH:
+			prevHash := self.env.PrevHash()
+
+			stack.Push(ethutil.BigD(prevHash))
+
+			self.Printf(" => 0x%x", prevHash)
+		case COINBASE:
+			coinbase := self.env.Coinbase()
+
+			stack.Push(ethutil.BigD(coinbase))
+
+			self.Printf(" => 0x%x", coinbase)
+		case TIMESTAMP:
+			time := self.env.Time()
+
+			stack.Push(big.NewInt(time))
+
+			self.Printf(" => 0x%x", time)
+		case NUMBER:
+			number := self.env.BlockNumber()
+
+			stack.Push(number)
+
+			self.Printf(" => 0x%x", number.Bytes())
+		case DIFFICULTY:
+			difficulty := self.env.Difficulty()
+
+			stack.Push(difficulty)
+
+			self.Printf(" => 0x%x", difficulty.Bytes())
+		case GASLIMIT:
+			// TODO
+			stack.Push(big.NewInt(0))
+
+			// 0x50 range
+		case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
+			a := big.NewInt(int64(op) - int64(PUSH1) + 1)
+			pc.Add(pc, ethutil.Big1)
+			data := closure.Gets(pc, a)
+			val := ethutil.BigD(data.Bytes())
+			// Push value to stack
+			stack.Push(val)
+			pc.Add(pc, a.Sub(a, big.NewInt(1)))
+
+			step += int(op) - int(PUSH1) + 1
+
+			self.Printf(" => 0x%x", data.Bytes())
+		case POP:
+			require(1)
+			stack.Pop()
+		case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
+			n := int(op - DUP1 + 1)
+			v := stack.Dupn(n)
+
+			self.Printf(" => [%d] 0x%x", n, stack.Peek().Bytes())
+
+			if OpCode(closure.Get(new(big.Int).Add(pc, ethutil.Big1)).Uint()) == POP && OpCode(closure.Get(new(big.Int).Add(pc, big.NewInt(2))).Uint()) == POP {
+				fmt.Println(toValue(v))
+			}
+		case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
+			n := int(op - SWAP1 + 2)
+			x, y := stack.Swapn(n)
+
+			self.Printf(" => [%d] %x [0] %x", n, x.Bytes(), y.Bytes())
+		case MLOAD:
+			require(1)
+			offset := stack.Pop()
+			val := ethutil.BigD(mem.Get(offset.Int64(), 32))
+			stack.Push(val)
+
+			self.Printf(" => 0x%x", val.Bytes())
+		case MSTORE: // Store the value at stack top-1 in to memory at location stack top
+			require(2)
+			// Pop value of the stack
+			val, mStart := stack.Popn()
+			mem.Set(mStart.Int64(), 32, ethutil.BigToBytes(val, 256))
+
+			self.Printf(" => 0x%x", val)
+		case MSTORE8:
+			require(2)
+			off := stack.Pop()
+			val := stack.Pop()
+
+			mem.store[off.Int64()] = byte(val.Int64() & 0xff)
+
+			self.Printf(" => [%v] 0x%x", off, val)
+		case SLOAD:
+			require(1)
+			loc := stack.Pop()
+			val := closure.GetStorage(loc)
+
+			stack.Push(val.BigInt())
+
+			self.Printf(" {0x%x : 0x%x}", loc.Bytes(), val.Bytes())
+		case SSTORE:
+			require(2)
+			val, loc := stack.Popn()
+			closure.SetStorage(loc, ethutil.NewValue(val))
+
+			closure.message.AddStorageChange(loc.Bytes())
+
+			self.Printf(" {0x%x : 0x%x}", loc.Bytes(), val.Bytes())
+		case JUMP:
+			require(1)
+			pc = stack.Pop()
+			// Reduce pc by one because of the increment that's at the end of this for loop
+			self.Printf(" ~> %v", pc).Endl()
+
+			continue
+		case JUMPI:
+			require(2)
+			cond, pos := stack.Popn()
+			if cond.Cmp(ethutil.BigTrue) >= 0 {
+				pc = pos
+
+				if OpCode(closure.Get(pc).Uint()) != JUMPDEST {
+					return closure.Return(nil), fmt.Errorf("JUMP missed JUMPDEST %v", pc)
+				}
+
+				continue
+			} else {
+				self.Printf(" (f)")
+			}
+		case JUMPDEST:
+			self.Printf(" ~> %v (t)", pc).Endl()
+		case PC:
+			stack.Push(pc)
+		case MSIZE:
+			stack.Push(big.NewInt(int64(mem.Len())))
+		case GAS:
+			stack.Push(closure.Gas)
+			// 0x60 range
+		case CREATE:
+			require(3)
+
+			var (
+				err          error
+				value        = stack.Pop()
+				size, offset = stack.Popn()
+				input        = mem.Get(offset.Int64(), size.Int64())
+				gas          = new(big.Int).Set(closure.Gas)
+
+				// Snapshot the current stack so we are able to
+				// revert back to it later.
+				//snapshot = self.env.State().Copy()
+			)
+
+			// Generate a new address
+			addr := ethcrypto.CreateAddress(closure.Address(), closure.object.Nonce)
+			closure.object.Nonce++
+
+			self.Printf(" (*) %x", addr).Endl()
+
+			closure.UseGas(closure.Gas)
+
+			msg := NewExecution(self, addr, input, gas, closure.Price, value)
+			ret, err := msg.Exec(addr, closure)
+			if err != nil {
+				stack.Push(ethutil.BigFalse)
+
+				// Revert the state as it was before.
+				//self.env.State().Set(snapshot)
+
+				self.Printf("CREATE err %v", err)
+			} else {
+				msg.object.Code = ret
+
+				stack.Push(ethutil.BigD(addr))
+			}
+
+			self.Endl()
+
+			// Debug hook
+			if self.Dbg != nil {
+				self.Dbg.SetCode(closure.Code)
+			}
+		case CALL, CALLCODE:
+			require(7)
+
+			self.Endl()
+
+			gas := stack.Pop()
+			// Pop gas and value of the stack.
+			value, addr := stack.Popn()
+			// Pop input size and offset
+			inSize, inOffset := stack.Popn()
+			// Pop return size and offset
+			retSize, retOffset := stack.Popn()
+
+			// Get the arguments from the memory
+			args := mem.Get(inOffset.Int64(), inSize.Int64())
+
+			//snapshot := self.env.State().Copy()
+
+			var executeAddr []byte
+			if op == CALLCODE {
+				executeAddr = closure.Address()
+			} else {
+				executeAddr = addr.Bytes()
+			}
+
+			msg := NewExecution(self, executeAddr, args, gas, closure.Price, value)
+			ret, err := msg.Exec(addr.Bytes(), closure)
+			if err != nil {
+				stack.Push(ethutil.BigFalse)
+
+				//self.env.State().Set(snapshot)
+			} else {
+				stack.Push(ethutil.BigTrue)
+
+				mem.Set(retOffset.Int64(), retSize.Int64(), ret)
+			}
+
+			// Debug hook
+			if self.Dbg != nil {
+				self.Dbg.SetCode(closure.Code)
+			}
+
+		case RETURN:
+			require(2)
+			size, offset := stack.Popn()
+			ret := mem.Get(offset.Int64(), size.Int64())
+
+			self.Printf(" => (%d) 0x%x", len(ret), ret).Endl()
+
+			return closure.Return(ret), nil
+		case SUICIDE:
+			require(1)
+
+			receiver := self.env.State().GetOrNewStateObject(stack.Pop().Bytes())
+
+			receiver.AddAmount(closure.object.Balance)
+
+			closure.object.MarkForDeletion()
+
+			fallthrough
+		case STOP: // Stop the closure
+			self.Endl()
+
+			return closure.Return(nil), nil
+		default:
+			vmlogger.Debugf("(pc) %-3v Invalid opcode %x\n", pc, op)
+
+			//panic(fmt.Sprintf("Invalid opcode %x", op))
+
+			return closure.Return(nil), fmt.Errorf("Invalid opcode %x", op)
+		}
+
+		pc.Add(pc, ethutil.Big1)
+
+		self.Endl()
+
+		if self.Dbg != nil {
+			for _, instrNo := range self.Dbg.BreakPoints() {
+				if pc.Cmp(big.NewInt(instrNo)) == 0 {
+					self.Stepping = true
+
+					if !self.Dbg.BreakHook(prevStep, op, mem, stack, closure.Object()) {
+						return nil, nil
+					}
+				} else if self.Stepping {
+					if !self.Dbg.StepHook(prevStep, op, mem, stack, closure.Object()) {
+						return nil, nil
+					}
+				}
+			}
+		}
+
+	}
+}
+
+func (self *DebugVm) Printf(format string, v ...interface{}) *DebugVm {
+	if self.logTy == LogTyPretty {
+		self.logStr += fmt.Sprintf(format, v...)
+	}
+
+	return self
+}
+
+func (self *DebugVm) Endl() *DebugVm {
+	if self.logTy == LogTyPretty {
+		vmlogger.Debugln(self.logStr)
+		self.logStr = ""
+	}
+
+	return self
+}
+
+func (self *DebugVm) Env() Environment {
+	return self.env
+}
+
+func (self *DebugVm) Depth() int {
+	return self.depth
+}