// Creates a 20 byte address and bumps the nonce.
func createAddress(creator *Account) Word256 {
nonce := creator.Nonce
creator.Nonce += 1
temp := make([]byte, 32+8)
copy(temp, creator.Address[:])
PutUint64BE(temp[32:], nonce)
return LeftPadWord256(sha3.Sha3(temp)[:20])
}
func ecrecoverFunc(input []byte, gas *uint64) (output []byte, err error) {
// Deduct gas
gasRequired := GasEcRecover
if *gas < gasRequired {
return nil, ErrInsufficientGas
} else {
*gas -= gasRequired
}
// Recover
hash := input[:32]
v := byte(input[32] - 27) // ignore input[33:64], v is small.
sig := append(input[64:], v)
recovered, err := secp256k1.RecoverPubkey(hash, sig)
if err != nil {
return nil, err
}
hashed := sha3.Sha3(recovered[1:])
return LeftPadBytes(hashed, 32), nil
}
// Convenience function to return address of new contract
func NewContractAddress(caller []byte, nonce uint64) []byte {
temp := make([]byte, 32+8)
copy(temp, caller)
PutUint64BE(temp[32:], nonce)
return sha3.Sha3(temp)[:20]
}
// Just like Call() but does not transfer 'value' or modify the callDepth.
func (vm *VM) call(caller, callee *Account, code, input []byte, value uint64, gas *uint64) (output []byte, err error) {
dbg.Printf("(%d) (%X) %X (code=%d) gas: %v (d) %X\n", vm.callDepth, caller.Address[:4], callee.Address, len(callee.Code), *gas, input)
var (
pc uint64 = 0
stack = NewStack(dataStackCapacity, gas, &err)
memory = make([]byte, memoryCapacity)
ok = false // convenience
)
for {
// If there is an error, return
if err != nil {
return nil, err
}
var op = codeGetOp(code, pc)
dbg.Printf("(pc) %-3d (op) %-14s (st) %-4d ", pc, op.String(), stack.Len())
switch op {
case STOP: // 0x00
return nil, nil
case ADD: // 0x01
x, y := stack.Pop(), stack.Pop()
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
sum := new(big.Int).Add(xb, yb)
res := LeftPadWord256(U256(sum).Bytes())
stack.Push(res)
dbg.Printf(" %v + %v = %v (%X)\n", xb, yb, sum, res)
case MUL: // 0x02
x, y := stack.Pop(), stack.Pop()
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
prod := new(big.Int).Mul(xb, yb)
res := LeftPadWord256(U256(prod).Bytes())
stack.Push(res)
dbg.Printf(" %v * %v = %v (%X)\n", xb, yb, prod, res)
case SUB: // 0x03
x, y := stack.Pop(), stack.Pop()
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
diff := new(big.Int).Sub(xb, yb)
res := LeftPadWord256(U256(diff).Bytes())
stack.Push(res)
dbg.Printf(" %v - %v = %v (%X)\n", xb, yb, diff, res)
case DIV: // 0x04
x, y := stack.Pop(), stack.Pop()
if y.IsZero() {
stack.Push(Zero256)
dbg.Printf(" %x / %x = %v\n", x, y, 0)
} else {
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
div := new(big.Int).Div(xb, yb)
res := LeftPadWord256(U256(div).Bytes())
stack.Push(res)
dbg.Printf(" %v / %v = %v (%X)\n", xb, yb, div, res)
}
case SDIV: // 0x05
x, y := stack.Pop(), stack.Pop()
if y.IsZero() {
stack.Push(Zero256)
dbg.Printf(" %x / %x = %v\n", x, y, 0)
} else {
xb := S256(new(big.Int).SetBytes(x[:]))
yb := S256(new(big.Int).SetBytes(y[:]))
div := new(big.Int).Div(xb, yb)
res := LeftPadWord256(U256(div).Bytes())
stack.Push(res)
dbg.Printf(" %v / %v = %v (%X)\n", xb, yb, div, res)
}
case MOD: // 0x06
x, y := stack.Pop(), stack.Pop()
if y.IsZero() {
stack.Push(Zero256)
dbg.Printf(" %v %% %v = %v\n", x, y, 0)
} else {
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
mod := new(big.Int).Mod(xb, yb)
res := LeftPadWord256(U256(mod).Bytes())
stack.Push(res)
dbg.Printf(" %v %% %v = %v (%X)\n", xb, yb, mod, res)
}
case SMOD: // 0x07
x, y := stack.Pop(), stack.Pop()
if y.IsZero() {
stack.Push(Zero256)
dbg.Printf(" %v %% %v = %v\n", x, y, 0)
} else {
xb := S256(new(big.Int).SetBytes(x[:]))
yb := S256(new(big.Int).SetBytes(y[:]))
mod := new(big.Int).Mod(xb, yb)
res := LeftPadWord256(U256(mod).Bytes())
stack.Push(res)
dbg.Printf(" %v %% %v = %v (%X)\n", xb, yb, mod, res)
}
case ADDMOD: // 0x08
x, y, z := stack.Pop(), stack.Pop(), stack.Pop()
if z.IsZero() {
stack.Push(Zero256)
dbg.Printf(" %v %% %v = %v\n", x, y, 0)
} else {
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
zb := new(big.Int).SetBytes(z[:])
add := new(big.Int).Add(xb, yb)
mod := new(big.Int).Mod(add, zb)
res := LeftPadWord256(U256(mod).Bytes())
stack.Push(res)
dbg.Printf(" %v + %v %% %v = %v (%X)\n",
xb, yb, zb, mod, res)
}
case MULMOD: // 0x09
x, y, z := stack.Pop(), stack.Pop(), stack.Pop()
if z.IsZero() {
stack.Push(Zero256)
dbg.Printf(" %v %% %v = %v\n", x, y, 0)
} else {
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
zb := new(big.Int).SetBytes(z[:])
mul := new(big.Int).Mul(xb, yb)
mod := new(big.Int).Mod(mul, zb)
res := LeftPadWord256(U256(mod).Bytes())
stack.Push(res)
dbg.Printf(" %v * %v %% %v = %v (%X)\n",
xb, yb, zb, mod, res)
}
case EXP: // 0x0A
x, y := stack.Pop(), stack.Pop()
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
pow := new(big.Int).Exp(xb, yb, big.NewInt(0))
res := LeftPadWord256(U256(pow).Bytes())
stack.Push(res)
dbg.Printf(" %v ** %v = %v (%X)\n", xb, yb, pow, res)
case SIGNEXTEND: // 0x0B
back := stack.Pop()
backb := new(big.Int).SetBytes(back[:])
if backb.Cmp(big.NewInt(31)) < 0 {
bit := uint(backb.Uint64()*8 + 7)
num := stack.Pop()
numb := new(big.Int).SetBytes(num[:])
mask := new(big.Int).Lsh(big.NewInt(1), bit)
mask.Sub(mask, big.NewInt(1))
if numb.Bit(int(bit)) == 1 {
numb.Or(numb, mask.Not(mask))
} else {
numb.Add(numb, mask)
}
res := LeftPadWord256(U256(numb).Bytes())
dbg.Printf(" = %v (%X)", numb, res)
stack.Push(res)
}
case LT: // 0x10
x, y := stack.Pop(), stack.Pop()
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
if xb.Cmp(yb) < 0 {
stack.Push64(1)
dbg.Printf(" %v < %v = %v\n", xb, yb, 1)
} else {
stack.Push(Zero256)
dbg.Printf(" %v < %v = %v\n", xb, yb, 0)
}
case GT: // 0x11
x, y := stack.Pop(), stack.Pop()
xb := new(big.Int).SetBytes(x[:])
yb := new(big.Int).SetBytes(y[:])
if xb.Cmp(yb) > 0 {
stack.Push64(1)
dbg.Printf(" %v > %v = %v\n", xb, yb, 1)
} else {
stack.Push(Zero256)
dbg.Printf(" %v > %v = %v\n", xb, yb, 0)
}
case SLT: // 0x12
x, y := stack.Pop(), stack.Pop()
xb := S256(new(big.Int).SetBytes(x[:]))
yb := S256(new(big.Int).SetBytes(y[:]))
if xb.Cmp(yb) < 0 {
stack.Push64(1)
dbg.Printf(" %v < %v = %v\n", xb, yb, 1)
} else {
stack.Push(Zero256)
dbg.Printf(" %v < %v = %v\n", xb, yb, 0)
}
case SGT: // 0x13
x, y := stack.Pop(), stack.Pop()
xb := S256(new(big.Int).SetBytes(x[:]))
yb := S256(new(big.Int).SetBytes(y[:]))
if xb.Cmp(yb) > 0 {
stack.Push64(1)
dbg.Printf(" %v > %v = %v\n", xb, yb, 1)
} else {
stack.Push(Zero256)
dbg.Printf(" %v > %v = %v\n", xb, yb, 0)
}
case EQ: // 0x14
x, y := stack.Pop(), stack.Pop()
if bytes.Equal(x[:], y[:]) {
stack.Push64(1)
dbg.Printf(" %X == %X = %v\n", x, y, 1)
} else {
stack.Push(Zero256)
dbg.Printf(" %X == %X = %v\n", x, y, 0)
}
case ISZERO: // 0x15
x := stack.Pop()
if x.IsZero() {
stack.Push64(1)
dbg.Printf(" %v == 0 = %v\n", x, 1)
} else {
stack.Push(Zero256)
dbg.Printf(" %v == 0 = %v\n", x, 0)
}
case AND: // 0x16
x, y := stack.Pop(), stack.Pop()
z := [32]byte{}
for i := 0; i < 32; i++ {
z[i] = x[i] & y[i]
}
stack.Push(z)
dbg.Printf(" %X & %X = %X\n", x, y, z)
case OR: // 0x17
x, y := stack.Pop(), stack.Pop()
z := [32]byte{}
for i := 0; i < 32; i++ {
z[i] = x[i] | y[i]
}
stack.Push(z)
dbg.Printf(" %X | %X = %X\n", x, y, z)
case XOR: // 0x18
x, y := stack.Pop(), stack.Pop()
z := [32]byte{}
for i := 0; i < 32; i++ {
z[i] = x[i] ^ y[i]
}
stack.Push(z)
dbg.Printf(" %X ^ %X = %X\n", x, y, z)
case NOT: // 0x19
x := stack.Pop()
z := [32]byte{}
for i := 0; i < 32; i++ {
z[i] = ^x[i]
}
stack.Push(z)
dbg.Printf(" !%X = %X\n", x, z)
case BYTE: // 0x1A
idx, val := stack.Pop64(), stack.Pop()
res := byte(0)
if idx < 32 {
res = val[idx]
}
stack.Push64(uint64(res))
dbg.Printf(" => 0x%X\n", res)
case SHA3: // 0x20
if ok = useGas(gas, GasSha3); !ok {
return nil, firstErr(err, ErrInsufficientGas)
}
offset, size := stack.Pop64(), stack.Pop64()
data, ok := subslice(memory, offset, size)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
data = sha3.Sha3(data)
stack.PushBytes(data)
dbg.Printf(" => (%v) %X\n", size, data)
case ADDRESS: // 0x30
stack.Push(callee.Address)
dbg.Printf(" => %X\n", callee.Address)
case BALANCE: // 0x31
addr := stack.Pop()
if ok = useGas(gas, GasGetAccount); !ok {
return nil, firstErr(err, ErrInsufficientGas)
}
acc := vm.appState.GetAccount(addr)
if acc == nil {
return nil, firstErr(err, ErrUnknownAddress)
}
balance := acc.Balance
stack.Push64(balance)
dbg.Printf(" => %v (%X)\n", balance, addr)
case ORIGIN: // 0x32
stack.Push(vm.origin)
dbg.Printf(" => %X\n", vm.origin)
case CALLER: // 0x33
stack.Push(caller.Address)
dbg.Printf(" => %X\n", caller.Address)
case CALLVALUE: // 0x34
stack.Push64(value)
dbg.Printf(" => %v\n", value)
case CALLDATALOAD: // 0x35
offset := stack.Pop64()
data, ok := subslice(input, offset, 32)
if !ok {
return nil, firstErr(err, ErrInputOutOfBounds)
}
res := LeftPadWord256(data)
stack.Push(res)
dbg.Printf(" => 0x%X\n", res)
case CALLDATASIZE: // 0x36
stack.Push64(uint64(len(input)))
dbg.Printf(" => %d\n", len(input))
case CALLDATACOPY: // 0x37
memOff := stack.Pop64()
inputOff := stack.Pop64()
length := stack.Pop64()
data, ok := subslice(input, inputOff, length)
if !ok {
return nil, firstErr(err, ErrInputOutOfBounds)
}
dest, ok := subslice(memory, memOff, length)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
copy(dest, data)
dbg.Printf(" => [%v, %v, %v] %X\n", memOff, inputOff, length, data)
case CODESIZE: // 0x38
l := uint64(len(code))
stack.Push64(l)
dbg.Printf(" => %d\n", l)
case CODECOPY: // 0x39
memOff := stack.Pop64()
codeOff := stack.Pop64()
length := stack.Pop64()
data, ok := subslice(code, codeOff, length)
if !ok {
return nil, firstErr(err, ErrCodeOutOfBounds)
}
dest, ok := subslice(memory, memOff, length)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
copy(dest, data)
dbg.Printf(" => [%v, %v, %v] %X\n", memOff, codeOff, length, data)
case GASPRICE_DEPRECATED: // 0x3A
stack.Push(Zero256)
dbg.Printf(" => %X (GASPRICE IS DEPRECATED)\n")
case EXTCODESIZE: // 0x3B
addr := stack.Pop()
if ok = useGas(gas, GasGetAccount); !ok {
return nil, firstErr(err, ErrInsufficientGas)
}
acc := vm.appState.GetAccount(addr)
if acc == nil {
return nil, firstErr(err, ErrUnknownAddress)
}
code := acc.Code
l := uint64(len(code))
stack.Push64(l)
dbg.Printf(" => %d\n", l)
case EXTCODECOPY: // 0x3C
addr := stack.Pop()
if ok = useGas(gas, GasGetAccount); !ok {
return nil, firstErr(err, ErrInsufficientGas)
}
acc := vm.appState.GetAccount(addr)
if acc == nil {
return nil, firstErr(err, ErrUnknownAddress)
}
code := acc.Code
memOff := stack.Pop64()
codeOff := stack.Pop64()
length := stack.Pop64()
data, ok := subslice(code, codeOff, length)
if !ok {
return nil, firstErr(err, ErrCodeOutOfBounds)
}
dest, ok := subslice(memory, memOff, length)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
copy(dest, data)
dbg.Printf(" => [%v, %v, %v] %X\n", memOff, codeOff, length, data)
case BLOCKHASH: // 0x40
stack.Push(Zero256)
dbg.Printf(" => 0x%X (NOT SUPPORTED)\n", stack.Peek().Bytes())
case COINBASE: // 0x41
stack.Push(Zero256)
dbg.Printf(" => 0x%X (NOT SUPPORTED)\n", stack.Peek().Bytes())
case TIMESTAMP: // 0x42
time := vm.params.BlockTime
stack.Push64(uint64(time))
dbg.Printf(" => 0x%X\n", time)
case BLOCKHEIGHT: // 0x43
number := uint64(vm.params.BlockHeight)
stack.Push64(number)
dbg.Printf(" => 0x%X\n", number)
case GASLIMIT: // 0x45
stack.Push64(vm.params.GasLimit)
dbg.Printf(" => %v\n", vm.params.GasLimit)
case POP: // 0x50
stack.Pop()
dbg.Printf(" => %v\n", vm.params.GasLimit)
case MLOAD: // 0x51
offset := stack.Pop64()
data, ok := subslice(memory, offset, 32)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
stack.Push(LeftPadWord256(data))
dbg.Printf(" => 0x%X\n", data)
case MSTORE: // 0x52
offset, data := stack.Pop64(), stack.Pop()
dest, ok := subslice(memory, offset, 32)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
copy(dest, data[:])
dbg.Printf(" => 0x%X\n", data)
case MSTORE8: // 0x53
offset, val := stack.Pop64(), byte(stack.Pop64()&0xFF)
if len(memory) <= int(offset) {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
memory[offset] = val
dbg.Printf(" => [%v] 0x%X\n", offset, val)
case SLOAD: // 0x54
loc := stack.Pop()
data := vm.appState.GetStorage(callee.Address, loc)
stack.Push(data)
dbg.Printf(" {0x%X : 0x%X}\n", loc, data)
case SSTORE: // 0x55
loc, data := stack.Pop(), stack.Pop()
vm.appState.SetStorage(callee.Address, loc, data)
useGas(gas, GasStorageUpdate)
dbg.Printf(" {0x%X : 0x%X}\n", loc, data)
case JUMP: // 0x56
err = jump(code, stack.Pop64(), &pc)
continue
case JUMPI: // 0x57
pos, cond := stack.Pop64(), stack.Pop()
if !cond.IsZero() {
err = jump(code, pos, &pc)
continue
}
dbg.Printf(" ~> false\n")
case PC: // 0x58
stack.Push64(pc)
case MSIZE: // 0x59
stack.Push64(uint64(len(memory)))
case GAS: // 0x5A
stack.Push64(*gas)
dbg.Printf(" => %X\n", *gas)
case JUMPDEST: // 0x5B
dbg.Printf("\n")
// Do nothing
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)
codeSegment, ok := subslice(code, pc+1, a)
if !ok {
return nil, firstErr(err, ErrCodeOutOfBounds)
}
res := LeftPadWord256(codeSegment)
stack.Push(res)
pc += a
dbg.Printf(" => 0x%X\n", res)
//stack.Print(10)
case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
n := int(op - DUP1 + 1)
stack.Dup(n)
dbg.Printf(" => [%d] 0x%X\n", 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)
stack.Swap(n)
dbg.Printf(" => [%d] %X\n", n, stack.Peek())
//stack.Print(10)
case LOG0, LOG1, LOG2, LOG3, LOG4:
n := int(op - LOG0)
topics := make([]Word256, n)
offset, size := stack.Pop64(), stack.Pop64()
for i := 0; i < n; i++ {
topics[i] = stack.Pop()
}
data, ok := subslice(memory, offset, size)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
log := &Log{
callee.Address,
topics,
data,
vm.params.BlockHeight,
}
vm.appState.AddLog(log)
dbg.Printf(" => %v\n", log)
case CREATE: // 0xF0
contractValue := stack.Pop64()
offset, size := stack.Pop64(), stack.Pop64()
input, ok := subslice(memory, offset, size)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
// Check balance
if callee.Balance < contractValue {
return nil, firstErr(err, ErrInsufficientBalance)
}
// TODO charge for gas to create account _ the code length * GasCreateByte
newAccount := vm.appState.CreateAccount(callee)
// Run the input to get the contract code.
ret, err_ := vm.Call(callee, newAccount, input, input, contractValue, gas)
if err_ != nil {
stack.Push(Zero256)
} else {
newAccount.Code = ret // Set the code
stack.Push(newAccount.Address)
}
case CALL, CALLCODE: // 0xF1, 0xF2
gasLimit := stack.Pop64()
addr, value := stack.Pop(), stack.Pop64()
inOffset, inSize := stack.Pop64(), stack.Pop64() // inputs
retOffset, retSize := stack.Pop64(), stack.Pop64() // outputs
dbg.Printf(" => %X\n", addr)
// Get the arguments from the memory
args, ok := subslice(memory, inOffset, inSize)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
// Ensure that gasLimit is reasonable
if *gas < gasLimit {
return nil, firstErr(err, ErrInsufficientGas)
} else {
*gas -= gasLimit
// NOTE: we will return any used gas later.
}
// Begin execution
var ret []byte
var err error
if nativeContract := nativeContracts[addr]; nativeContract != nil {
// Native contract
ret, err = nativeContract(args, &gasLimit)
} else {
// EVM contract
if ok = useGas(gas, GasGetAccount); !ok {
return nil, firstErr(err, ErrInsufficientGas)
}
acc := vm.appState.GetAccount(addr)
// since CALL is used also for sending funds,
// acc may not exist yet. This is an error for
// CALLCODE, but not for CALL, though I don't think
// ethereum actually cares
if op == CALLCODE {
if acc == nil {
return nil, firstErr(err, ErrUnknownAddress)
}
ret, err = vm.Call(callee, callee, acc.Code, args, value, gas)
} else {
if acc == nil {
// if we have not seen the account before, create it
// so we can send funds
acc = &Account{
Address: addr,
}
vm.appState.UpdateAccount(acc)
}
ret, err = vm.Call(callee, acc, acc.Code, args, value, gas)
}
}
// Push result
if err != nil {
dbg.Printf("error on call: %s", err.Error())
// TODO: fire event
stack.Push(Zero256)
} else {
stack.Push(One256)
dest, ok := subslice(memory, retOffset, retSize)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
copy(dest, ret)
}
// Handle remaining gas.
*gas += gasLimit
dbg.Printf("resume %X (%v)\n", callee.Address, gas)
case RETURN: // 0xF3
offset, size := stack.Pop64(), stack.Pop64()
ret, ok := subslice(memory, offset, size)
if !ok {
return nil, firstErr(err, ErrMemoryOutOfBounds)
}
dbg.Printf(" => [%v, %v] (%d) 0x%X\n", offset, size, len(ret), ret)
return ret, nil
case SUICIDE: // 0xFF
addr := stack.Pop()
if ok = useGas(gas, GasGetAccount); !ok {
return nil, firstErr(err, ErrInsufficientGas)
}
// TODO if the receiver is , then make it the fee.
receiver := vm.appState.GetAccount(addr)
if receiver == nil {
return nil, firstErr(err, ErrUnknownAddress)
}
balance := callee.Balance
receiver.Balance += balance
vm.appState.UpdateAccount(receiver)
vm.appState.RemoveAccount(callee)
dbg.Printf(" => (%X) %v\n", addr[:4], balance)
fallthrough
default:
dbg.Printf("(pc) %-3v Invalid opcode %X\n", pc, op)
panic(fmt.Errorf("Invalid opcode %X", op))
}
pc++
}
}
