VmDebug => StdVm

1 files changed, 945 insertions, 22 deletions

diff --git a/vm/vm.go b/vm/vm.go
index b795bb86e..6aa39797e 100644
--- a/vm/vm.go
+++ b/vm/vm.go
@@ -1,38 +1,961 @@
 package vm
 
-import "math/big"
+import (
+	"fmt"
+	"math/big"
 
-// BIG FAT WARNING. THIS VM IS NOT YET IS USE!
-// I want to get all VM tests pass first before updating this VM
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/state"
+)
 
 type Vm struct {
-	env   Environment
-	err   error
-	depth int
+	env Environment
+
+	logTy  byte
+	logStr string
+
+	err error
+
+	// Debugging
+	Dbg Debugger
+
+	BreakPoints []int64
+	Stepping    bool
+	Fn          string
+
+	Recoverable bool
+}
+
+func NewVm(env Environment) *Vm {
+	lt := LogTyPretty
+	if ethutil.Config.Diff {
+		lt = LogTyDiff
+	}
+
+	return &Vm{env: env, logTy: lt, Recoverable: true}
+}
+
+func (self *Vm) Run(me, caller ContextRef, code []byte, value, gas, price *big.Int, callData []byte) (ret []byte, err error) {
+	self.env.SetDepth(self.env.Depth() + 1)
+
+	msg := self.env.State().Manifest().AddMessage(&state.Message{
+		To: me.Address(), From: caller.Address(),
+		Input:     callData,
+		Origin:    self.env.Origin(),
+		Timestamp: self.env.Time(), Coinbase: self.env.Coinbase(), Number: self.env.BlockNumber(),
+		Value: value,
+	})
+	context := NewContext(caller, me, code, gas, price)
+
+	vmlogger.Debugf("(%d) (%x) %x (code=%d) gas: %v (d) %x\n", self.env.Depth(), caller.Address()[:4], context.Address(), len(code), context.Gas, callData)
+
+	if self.Recoverable {
+		// Recover from any require exception
+		defer func() {
+			if r := recover(); r != nil {
+				self.Printf(" %v", r).Endl()
+
+				context.UseGas(context.Gas)
+
+				ret = context.Return(nil)
+
+				err = fmt.Errorf("%v", r)
+
+			}
+		}()
+	}
+
+	if p := Precompiled[string(me.Address())]; p != nil {
+		return self.RunPrecompiled(p, callData, context)
+	}
+
+	var (
+		op OpCode
+
+		destinations        = analyseJumpDests(context.Code)
+		mem                 = NewMemory()
+		stack               = NewStack()
+		pc           uint64 = 0
+		step                = 0
+		prevStep            = 0
+		statedb             = self.env.State()
+
+		jump = func(from uint64, to *big.Int) {
+			p := to.Uint64()
+
+			nop := context.GetOp(p)
+			if !destinations.Has(p) {
+				panic(fmt.Sprintf("invalid jump destination (%v) %v", nop, p))
+			}
+
+			self.Printf(" ~> %v", to)
+			pc = to.Uint64()
+
+			self.Endl()
+		}
+	)
+
+	// Don't bother with the execution if there's no code.
+	if len(code) == 0 {
+		return context.Return(nil), nil
+	}
+
+	for {
+		prevStep = step
+		// The base for all big integer arithmetic
+		base := new(big.Int)
+
+		step++
+		// Get the memory location of pc
+		op = context.GetOp(pc)
+
+		self.Printf("(pc) %-3d -o- %-14s (m) %-4d (s) %-4d ", pc, op.String(), mem.Len(), stack.Len())
+
+		newMemSize, gas := self.calculateGasAndSize(context, caller, op, statedb, mem, stack)
+
+		self.Printf("(g) %-3v (%v)", gas, context.Gas)
+
+		if !context.UseGas(gas) {
+			self.Endl()
+
+			tmp := new(big.Int).Set(context.Gas)
+
+			context.UseGas(context.Gas)
+
+			return context.Return(nil), OOG(gas, tmp)
+		}
+
+		mem.Resize(newMemSize.Uint64())
+
+		switch op {
+		// 0x20 range
+		case ADD:
+			x, y := stack.Popn()
+			self.Printf(" %v + %v", y, x)
+
+			base.Add(y, x)
+
+			U256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case SUB:
+			x, y := stack.Popn()
+			self.Printf(" %v - %v", y, x)
+
+			base.Sub(y, x)
+
+			U256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case MUL:
+			x, y := stack.Popn()
+			self.Printf(" %v * %v", y, x)
+
+			base.Mul(y, x)
+
+			U256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case DIV:
+			x, y := stack.Pop(), stack.Pop()
+			self.Printf(" %v / %v", x, y)
+
+			if y.Cmp(ethutil.Big0) != 0 {
+				base.Div(x, y)
+			}
+
+			U256(base)
+
+			self.Printf(" = %v", base)
+			// Pop result back on the stack
+			stack.Push(base)
+		case SDIV:
+			x, y := S256(stack.Pop()), S256(stack.Pop())
+
+			self.Printf(" %v / %v", x, y)
+
+			if y.Cmp(ethutil.Big0) == 0 {
+				base.Set(ethutil.Big0)
+			} else {
+				n := new(big.Int)
+				if new(big.Int).Mul(x, y).Cmp(ethutil.Big0) < 0 {
+					n.SetInt64(-1)
+				} else {
+					n.SetInt64(1)
+				}
+
+				base.Div(x.Abs(x), y.Abs(y)).Mul(base, n)
+
+				U256(base)
+			}
+
+			self.Printf(" = %v", base)
+			stack.Push(base)
+		case MOD:
+			x, y := stack.Pop(), stack.Pop()
+
+			self.Printf(" %v %% %v", x, y)
+
+			if y.Cmp(ethutil.Big0) == 0 {
+				base.Set(ethutil.Big0)
+			} else {
+				base.Mod(x, y)
+			}
+
+			U256(base)
+
+			self.Printf(" = %v", base)
+			stack.Push(base)
+		case SMOD:
+			x, y := S256(stack.Pop()), S256(stack.Pop())
+
+			self.Printf(" %v %% %v", x, y)
+
+			if y.Cmp(ethutil.Big0) == 0 {
+				base.Set(ethutil.Big0)
+			} else {
+				n := new(big.Int)
+				if x.Cmp(ethutil.Big0) < 0 {
+					n.SetInt64(-1)
+				} else {
+					n.SetInt64(1)
+				}
+
+				base.Mod(x.Abs(x), y.Abs(y)).Mul(base, n)
+
+				U256(base)
+			}
+
+			self.Printf(" = %v", base)
+			stack.Push(base)
+
+		case EXP:
+			x, y := stack.Popn()
+
+			self.Printf(" %v ** %v", y, x)
+
+			base.Exp(y, x, Pow256)
+
+			U256(base)
+
+			self.Printf(" = %v", base)
+
+			stack.Push(base)
+		case SIGNEXTEND:
+			back := stack.Pop().Uint64()
+			if back < 31 {
+				bit := uint(back*8 + 7)
+				num := stack.Pop()
+				mask := new(big.Int).Lsh(ethutil.Big1, bit)
+				mask.Sub(mask, ethutil.Big1)
+				if ethutil.BitTest(num, int(bit)) {
+					num.Or(num, mask.Not(mask))
+				} else {
+					num.And(num, mask)
+				}
+
+				num = U256(num)
+
+				self.Printf(" = %v", num)
+
+				stack.Push(num)
+			}
+		case NOT:
+			base.Sub(Pow256, stack.Pop()).Sub(base, ethutil.Big1)
+
+			// Not needed
+			//base = U256(base)
+
+			stack.Push(base)
+		case LT:
+			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:
+			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:
+			y, x := S256(stack.Pop()), S256(stack.Pop())
+			self.Printf(" %v < %v", y, x)
+			// x < y
+			if y.Cmp(S256(x)) < 0 {
+				stack.Push(ethutil.BigTrue)
+			} else {
+				stack.Push(ethutil.BigFalse)
+			}
+		case SGT:
+			y, x := S256(stack.Pop()), S256(stack.Pop())
+			self.Printf(" %v > %v", y, x)
+
+			// x > y
+			if y.Cmp(x) > 0 {
+				stack.Push(ethutil.BigTrue)
+			} else {
+				stack.Push(ethutil.BigFalse)
+			}
+
+		case EQ:
+			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 ISZERO:
+			x := stack.Pop()
+			if x.Cmp(ethutil.BigFalse) > 0 {
+				stack.Push(ethutil.BigFalse)
+			} else {
+				stack.Push(ethutil.BigTrue)
+			}
+
+			// 0x10 range
+		case AND:
+			x, y := stack.Popn()
+			self.Printf(" %v & %v", y, x)
+
+			stack.Push(base.And(y, x))
+		case OR:
+			x, y := stack.Popn()
+			self.Printf(" %v | %v", y, x)
+
+			stack.Push(base.Or(y, x))
+		case XOR:
+			x, y := stack.Popn()
+			self.Printf(" %v ^ %v", y, x)
+
+			stack.Push(base.Xor(y, x))
+		case BYTE:
+			val, th := stack.Popn()
+
+			if th.Cmp(big.NewInt(32)) < 0 {
+				byt := big.NewInt(int64(ethutil.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))
+
+				base.Set(byt)
+			} else {
+				base.Set(ethutil.BigFalse)
+			}
+
+			self.Printf(" => 0x%x", base.Bytes())
+
+			stack.Push(base)
+		case ADDMOD:
+
+			x := stack.Pop()
+			y := stack.Pop()
+			z := stack.Pop()
+
+			add := new(big.Int).Add(x, y)
+			if len(z.Bytes()) > 0 { // NOT 0x0
+				base.Mod(add, z)
+
+				U256(base)
+			}
+
+			self.Printf(" %v + %v %% %v = %v", x, y, z, base)
+
+			stack.Push(base)
+		case MULMOD:
+
+			x := stack.Pop()
+			y := stack.Pop()
+			z := stack.Pop()
+
+			mul := new(big.Int).Mul(x, y)
+			if len(z.Bytes()) > 0 { // NOT 0x0
+				base.Mod(mul, z)
+
+				U256(base)
+			}
+
+			self.Printf(" %v + %v %% %v = %v", x, y, z, base)
+
+			stack.Push(base)
+
+			// 0x20 range
+		case SHA3:
+			size, offset := stack.Popn()
+			data := crypto.Sha3(mem.Get(offset.Int64(), size.Int64()))
+
+			stack.Push(ethutil.BigD(data))
+
+			self.Printf(" => %x", data)
+			// 0x30 range
+		case ADDRESS:
+			stack.Push(ethutil.BigD(context.Address()))
+
+			self.Printf(" => %x", context.Address())
+		case BALANCE:
+
+			addr := stack.Pop().Bytes()
+			balance := statedb.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 := context.caller.Address()
+			stack.Push(ethutil.BigD(caller))
+
+			self.Printf(" => %x", caller)
+		case CALLVALUE:
+			stack.Push(value)
+
+			self.Printf(" => %v", value)
+		case CALLDATALOAD:
+			var (
+				offset  = stack.Pop()
+				data    = make([]byte, 32)
+				lenData = big.NewInt(int64(len(callData)))
+			)
+
+			if lenData.Cmp(offset) >= 0 {
+				length := new(big.Int).Add(offset, ethutil.Big32)
+				length = ethutil.BigMin(length, lenData)
+
+				copy(data, callData[offset.Int64():length.Int64()])
+			}
+
+			self.Printf(" => 0x%x", data)
+
+			stack.Push(ethutil.BigD(data))
+		case CALLDATASIZE:
+			l := int64(len(callData))
+			stack.Push(big.NewInt(l))
+
+			self.Printf(" => %d", l)
+		case CALLDATACOPY:
+			var (
+				size = uint64(len(callData))
+				mOff = stack.Pop().Uint64()
+				cOff = stack.Pop().Uint64()
+				l    = stack.Pop().Uint64()
+			)
+
+			if cOff > size {
+				cOff = 0
+				l = 0
+			} else if cOff+l > size {
+				l = 0
+			}
+
+			code := callData[cOff : cOff+l]
+
+			mem.Set(mOff, l, code)
+
+			self.Printf(" => [%v, %v, %v] %x", mOff, cOff, l, callData[cOff:cOff+l])
+		case CODESIZE, EXTCODESIZE:
+			var code []byte
+			if op == EXTCODESIZE {
+				addr := stack.Pop().Bytes()
+
+				code = statedb.GetCode(addr)
+			} else {
+				code = context.Code
+			}
+
+			l := big.NewInt(int64(len(code)))
+			stack.Push(l)
+
+			self.Printf(" => %d", l)
+		case CODECOPY, EXTCODECOPY:
+			var code []byte
+			if op == EXTCODECOPY {
+				code = statedb.GetCode(stack.Pop().Bytes())
+			} else {
+				code = context.Code
+			}
+			context := NewContext(nil, nil, code, ethutil.Big0, ethutil.Big0)
+			var (
+				mOff = stack.Pop().Uint64()
+				cOff = stack.Pop().Uint64()
+				l    = stack.Pop().Uint64()
+			)
+			codeCopy := context.GetCode(cOff, l)
+
+			mem.Set(mOff, l, codeCopy)
+
+			self.Printf(" => [%v, %v, %v] %x", mOff, cOff, l, codeCopy)
+		case GASPRICE:
+			stack.Push(context.Price)
+
+			self.Printf(" => %v", context.Price)
+
+			// 0x40 range
+		case BLOCKHASH:
+			num := stack.Pop()
+
+			n := U256(new(big.Int).Sub(self.env.BlockNumber(), ethutil.Big257))
+			if num.Cmp(n) > 0 && num.Cmp(self.env.BlockNumber()) < 0 {
+				stack.Push(ethutil.BigD(self.env.GetHash(num.Uint64())))
+			} else {
+				stack.Push(ethutil.Big0)
+			}
+
+			self.Printf(" => 0x%x", stack.Peek().Bytes())
+		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:
+			self.Printf(" => %v", self.env.GasLimit())
+
+			stack.Push(self.env.GasLimit())
+
+			// 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 := uint64(op - PUSH1 + 1)
+			byts := context.GetRangeValue(pc+1, a)
+			// Push value to stack
+			stack.Push(ethutil.BigD(byts))
+			pc += a
+
+			step += int(op) - int(PUSH1) + 1
+
+			self.Printf(" => 0x%x", byts)
+		case POP:
+			stack.Pop()
+		case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
+			n := int(op - DUP1 + 1)
+			stack.Dupn(n)
+
+			self.Printf(" => [%d] 0x%x", n, stack.Peek().Bytes())
+		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 LOG0, LOG1, LOG2, LOG3, LOG4:
+			n := int(op - LOG0)
+			topics := make([][]byte, n)
+			mSize, mStart := stack.Popn()
+			for i := 0; i < n; i++ {
+				topics[i] = ethutil.LeftPadBytes(stack.Pop().Bytes(), 32)
+			}
+
+			data := mem.Get(mStart.Int64(), mSize.Int64())
+			log := &Log{context.Address(), topics, data}
+			self.env.AddLog(log)
+
+			self.Printf(" => %v", log)
+		case MLOAD:
+			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
+			// Pop value of the stack
+			val, mStart := stack.Popn()
+			mem.Set(mStart.Uint64(), 32, ethutil.BigToBytes(val, 256))
+
+			self.Printf(" => 0x%x", val)
+		case MSTORE8:
+			off := stack.Pop()
+			val := stack.Pop()
+
+			mem.store[off.Int64()] = byte(val.Int64() & 0xff)
+
+			self.Printf(" => [%v] 0x%x", off, val)
+		case SLOAD:
+			loc := stack.Pop()
+			val := ethutil.BigD(statedb.GetState(context.Address(), loc.Bytes()))
+			stack.Push(val)
+
+			self.Printf(" {0x%x : 0x%x}", loc.Bytes(), val.Bytes())
+		case SSTORE:
+			val, loc := stack.Popn()
+			statedb.SetState(context.Address(), loc.Bytes(), val)
+
+			msg.AddStorageChange(loc.Bytes())
+
+			self.Printf(" {0x%x : 0x%x}", loc.Bytes(), val.Bytes())
+		case JUMP:
+			jump(pc, stack.Pop())
+
+			continue
+		case JUMPI:
+			cond, pos := stack.Popn()
+
+			if cond.Cmp(ethutil.BigTrue) >= 0 {
+				jump(pc, pos)
+
+				continue
+			}
+
+		case JUMPDEST:
+		case PC:
+			stack.Push(big.NewInt(int64(pc)))
+		case MSIZE:
+			stack.Push(big.NewInt(int64(mem.Len())))
+		case GAS:
+			stack.Push(context.Gas)
+			// 0x60 range
+		case CREATE:
+
+			var (
+				value        = stack.Pop()
+				size, offset = stack.Popn()
+				input        = mem.Get(offset.Int64(), size.Int64())
+				gas          = new(big.Int).Set(context.Gas)
+				addr         []byte
+			)
+
+			context.UseGas(context.Gas)
+			ret, suberr, ref := self.env.Create(context, nil, input, gas, price, value)
+			if suberr != nil {
+				stack.Push(ethutil.BigFalse)
+
+				self.Printf(" (*) 0x0 %v", suberr)
+			} else {
+
+				// gas < len(ret) * CreateDataGas == NO_CODE
+				dataGas := big.NewInt(int64(len(ret)))
+				dataGas.Mul(dataGas, GasCreateByte)
+				if context.UseGas(dataGas) {
+					ref.SetCode(ret)
+					msg.Output = ret
+				}
+				addr = ref.Address()
+
+				stack.Push(ethutil.BigD(addr))
+
+				self.Printf(" (*) %x", addr)
+			}
+
+			// Debug hook
+			if self.Dbg != nil {
+				self.Dbg.SetCode(context.Code)
+			}
+		case CALL, CALLCODE:
+			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())
+
+			var (
+				ret []byte
+				err error
+			)
+			if op == CALLCODE {
+				ret, err = self.env.CallCode(context, addr.Bytes(), args, gas, price, value)
+			} else {
+				ret, err = self.env.Call(context, addr.Bytes(), args, gas, price, value)
+			}
+
+			if err != nil {
+				stack.Push(ethutil.BigFalse)
+
+				vmlogger.Debugln(err)
+			} else {
+				stack.Push(ethutil.BigTrue)
+				msg.Output = ret
+
+				mem.Set(retOffset.Uint64(), retSize.Uint64(), ret)
+			}
+			self.Printf("resume %x (%v)", context.Address(), context.Gas)
+
+			// Debug hook
+			if self.Dbg != nil {
+				self.Dbg.SetCode(context.Code)
+			}
+
+		case RETURN:
+			size, offset := stack.Popn()
+			ret := mem.Get(offset.Int64(), size.Int64())
+
+			self.Printf(" => [%v, %v] (%d) 0x%x", offset, size, len(ret), ret).Endl()
+
+			return context.Return(ret), nil
+		case SUICIDE:
+			receiver := statedb.GetOrNewStateObject(stack.Pop().Bytes())
+			balance := statedb.GetBalance(context.Address())
+
+			self.Printf(" => (%x) %v", receiver.Address()[:4], balance)
+
+			receiver.AddAmount(balance)
+			statedb.Delete(context.Address())
+
+			fallthrough
+		case STOP: // Stop the context
+			self.Endl()
+
+			return context.Return(nil), nil
+		default:
+			vmlogger.Debugf("(pc) %-3v Invalid opcode %x\n", pc, op)
+
+			panic(fmt.Errorf("Invalid opcode %x", op))
+		}
+
+		pc++
+
+		self.Endl()
+
+		if self.Dbg != nil {
+			for _, instrNo := range self.Dbg.BreakPoints() {
+				if pc == uint64(instrNo) {
+					self.Stepping = true
+
+					if !self.Dbg.BreakHook(prevStep, op, mem, stack, statedb.GetStateObject(context.Address())) {
+						return nil, nil
+					}
+				} else if self.Stepping {
+					if !self.Dbg.StepHook(prevStep, op, mem, stack, statedb.GetStateObject(context.Address())) {
+						return nil, nil
+					}
+				}
+			}
+		}
+
+	}
 }
 
-func New(env Environment, typ Type) VirtualMachine {
-	switch typ {
-	case DebugVmTy:
-		return NewDebugVm(env)
-	case JitVmTy:
-		return NewJitVm(env)
-	default:
-		return &Vm{env: env}
+func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCode, statedb *state.StateDB, mem *Memory, stack *Stack) (*big.Int, *big.Int) {
+	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
+	var additionalGas *big.Int = new(big.Int)
+	// Stack Check, memory resize & gas phase
+	switch op {
+	// Stack checks only
+	case ISZERO, CALLDATALOAD, POP, JUMP, NOT: // 1
+		stack.require(1)
+	case JUMPI, ADD, SUB, DIV, SDIV, MOD, SMOD, LT, GT, SLT, SGT, EQ, AND, OR, XOR, BYTE, SIGNEXTEND: // 2
+		stack.require(2)
+	case ADDMOD, MULMOD: // 3
+		stack.require(3)
+	case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
+		n := int(op - SWAP1 + 2)
+		stack.require(n)
+	case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
+		n := int(op - DUP1 + 1)
+		stack.require(n)
+	case LOG0, LOG1, LOG2, LOG3, LOG4:
+		n := int(op - LOG0)
+		stack.require(n + 2)
+
+		gas.Set(GasLog)
+		addStepGasUsage(new(big.Int).Mul(big.NewInt(int64(n)), GasLog))
+
+		mSize, mStart := stack.Peekn()
+		addStepGasUsage(mSize)
+
+		newMemSize = calcMemSize(mStart, mSize)
+	case EXP:
+		stack.require(2)
+
+		gas.Set(big.NewInt(int64(len(stack.data[stack.Len()-2].Bytes()) + 1)))
+	// Gas only
+	case STOP:
+		gas.Set(ethutil.Big0)
+	case SUICIDE:
+		stack.require(1)
+
+		gas.Set(ethutil.Big0)
+	case SLOAD:
+		stack.require(1)
+
+		gas.Set(GasSLoad)
+	// Memory resize & Gas
+	case SSTORE:
+		stack.require(2)
+
+		var mult *big.Int
+		y, x := stack.Peekn()
+		val := statedb.GetState(context.Address(), x.Bytes())
+		if len(val) == 0 && len(y.Bytes()) > 0 {
+			// 0 => non 0
+			mult = ethutil.Big3
+		} else if len(val) > 0 && len(y.Bytes()) == 0 {
+			statedb.Refund(caller.Address(), GasSStoreRefund)
+
+			mult = ethutil.Big0
+		} else {
+			// non 0 => non 0 (or 0 => 0)
+			mult = ethutil.Big1
+		}
+		gas.Set(new(big.Int).Mul(mult, GasSStore))
+	case BALANCE:
+		stack.require(1)
+		gas.Set(GasBalance)
+	case MSTORE:
+		stack.require(2)
+		newMemSize = calcMemSize(stack.Peek(), u256(32))
+	case MLOAD:
+		stack.require(1)
+
+		newMemSize = calcMemSize(stack.Peek(), u256(32))
+	case MSTORE8:
+		stack.require(2)
+		newMemSize = calcMemSize(stack.Peek(), u256(1))
+	case RETURN:
+		stack.require(2)
+
+		newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-2])
+	case SHA3:
+		stack.require(2)
+		gas.Set(GasSha)
+		newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-2])
+		additionalGas.Set(stack.data[stack.Len()-2])
+	case CALLDATACOPY:
+		stack.require(2)
+
+		newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-3])
+		additionalGas.Set(stack.data[stack.Len()-3])
+	case CODECOPY:
+		stack.require(3)
+
+		newMemSize = calcMemSize(stack.Peek(), stack.data[stack.Len()-3])
+		additionalGas.Set(stack.data[stack.Len()-3])
+	case EXTCODECOPY:
+		stack.require(4)
+
+		newMemSize = calcMemSize(stack.data[stack.Len()-2], stack.data[stack.Len()-4])
+		additionalGas.Set(stack.data[stack.Len()-4])
+	case CALL, CALLCODE:
+		stack.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:
+		stack.require(3)
+		gas.Set(GasCreate)
+
+		newMemSize = calcMemSize(stack.data[stack.Len()-2], stack.data[stack.Len()-3])
+	}
+
+	switch op {
+	case CALLDATACOPY, CODECOPY, EXTCODECOPY:
+		additionalGas.Add(additionalGas, u256(31))
+		additionalGas.Div(additionalGas, u256(32))
+		addStepGasUsage(additionalGas)
+	case SHA3:
+		additionalGas.Add(additionalGas, u256(31))
+		additionalGas.Div(additionalGas, u256(32))
+		additionalGas.Mul(additionalGas, GasSha3Byte)
+		addStepGasUsage(additionalGas)
+	}
+
+	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)
+		}
+
 	}
+
+	return newMemSize, gas
 }
 
-func (self *Vm) Run(me, caller ContextRef, code []byte, value, gas, price *big.Int, data []byte) (ret []byte, err error) {
-	panic("not implemented")
+func (self *Vm) RunPrecompiled(p *PrecompiledAccount, callData []byte, context *Context) (ret []byte, err error) {
+	gas := p.Gas(len(callData))
+	if context.UseGas(gas) {
+		ret = p.Call(callData)
+		self.Printf("NATIVE_FUNC => %x", ret)
+		self.Endl()
+
+		return context.Return(ret), nil
+	} else {
+		self.Printf("NATIVE_FUNC => failed").Endl()
+
+		tmp := new(big.Int).Set(context.Gas)
+
+		panic(OOG(gas, tmp).Error())
+	}
 }
 
-func (self *Vm) Env() Environment {
-	return self.env
+func (self *Vm) Printf(format string, v ...interface{}) VirtualMachine {
+	if self.logTy == LogTyPretty {
+		self.logStr += fmt.Sprintf(format, v...)
+	}
+
+	return self
 }
 
-func (self *Vm) Depth() int {
-	return self.depth
+func (self *Vm) Endl() VirtualMachine {
+	if self.logTy == LogTyPretty {
+		vmlogger.Debugln(self.logStr)
+		self.logStr = ""
+	}
+
+	return self
 }
 
-func (self *Vm) Printf(format string, v ...interface{}) VirtualMachine { return self }
-func (self *Vm) Endl() VirtualMachine                                  { return self }
+func (self *Vm) Env() Environment {
+	return self.env
+}