843 lines
18 KiB
Go
843 lines
18 KiB
Go
package ethchain
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import (
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"fmt"
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"github.com/ethereum/eth-go/ethcrypto"
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"github.com/ethereum/eth-go/ethlog"
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"github.com/ethereum/eth-go/ethutil"
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"math"
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"math/big"
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)
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var vmlogger = ethlog.NewLogger("VM")
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var (
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GasStep = big.NewInt(1)
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GasSha = big.NewInt(20)
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GasSLoad = big.NewInt(20)
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GasSStore = big.NewInt(100)
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GasBalance = big.NewInt(20)
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GasCreate = big.NewInt(100)
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GasCall = big.NewInt(20)
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GasMemory = big.NewInt(1)
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GasData = big.NewInt(5)
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GasTx = big.NewInt(500)
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LogTyPretty byte = 0x1
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LogTyDiff byte = 0x2
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)
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type Debugger interface {
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BreakHook(step int, op OpCode, mem *Memory, stack *Stack, stateObject *StateObject) bool
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StepHook(step int, op OpCode, mem *Memory, stack *Stack, stateObject *StateObject) bool
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BreakPoints() []int64
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SetCode(byteCode []byte)
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}
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type Vm struct {
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// Stack for processing contracts
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stack *Stack
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// non-persistent key/value memory storage
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mem map[string]*big.Int
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vars RuntimeVars
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state *State
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stateManager *StateManager
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Verbose bool
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logTy byte
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logStr string
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err error
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// Debugging
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Dbg Debugger
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BreakPoints []int64
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Stepping bool
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Fn string
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}
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type RuntimeVars struct {
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Origin []byte
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Block *Block
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BlockNumber *big.Int
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PrevHash []byte
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Coinbase []byte
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Time int64
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Diff *big.Int
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TxData []string
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Value *big.Int
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}
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func (self *Vm) Printf(format string, v ...interface{}) *Vm {
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if self.Verbose && self.logTy == LogTyPretty {
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self.logStr += fmt.Sprintf(format, v...)
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}
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return self
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}
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func (self *Vm) Endl() *Vm {
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if self.Verbose && self.logTy == LogTyPretty {
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vmlogger.Debugln(self.logStr)
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self.logStr = ""
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}
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return self
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}
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func NewVm(state *State, stateManager *StateManager, vars RuntimeVars) *Vm {
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lt := LogTyPretty
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if ethutil.Config.Diff {
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lt = LogTyDiff
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}
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return &Vm{vars: vars, state: state, stateManager: stateManager, logTy: lt}
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}
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var Pow256 = ethutil.BigPow(2, 256)
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var isRequireError = false
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func (vm *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
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// Recover from any require exception
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defer func() {
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if r := recover(); r != nil {
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ret = closure.Return(nil)
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err = fmt.Errorf("%v", r)
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vmlogger.Errorln("vm err", err)
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}
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}()
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// Debug hook
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if vm.Dbg != nil {
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vm.Dbg.SetCode(closure.Script)
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}
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// Don't bother with the execution if there's no code.
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if len(closure.Script) == 0 {
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return closure.Return(nil), nil
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}
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vmlogger.Debugf("(%s) %x gas: %v (d) %x\n", vm.Fn, closure.Address(), closure.Gas, closure.Args)
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var (
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op OpCode
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mem = &Memory{}
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stack = NewStack()
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pc = big.NewInt(0)
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step = 0
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prevStep = 0
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require = func(m int) {
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if stack.Len() < m {
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isRequireError = true
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panic(fmt.Sprintf("%04v (%v) stack err size = %d, required = %d", pc, op, stack.Len(), m))
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}
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}
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)
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for {
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prevStep = step
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// The base for all big integer arithmetic
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base := new(big.Int)
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step++
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// Get the memory location of pc
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val := closure.Get(pc)
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// Get the opcode (it must be an opcode!)
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op = OpCode(val.Uint())
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// XXX Leave this Println intact. Don't change this to the log system.
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// Used for creating diffs between implementations
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if vm.logTy == LogTyDiff {
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switch op {
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case STOP, RETURN, SUICIDE:
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closure.object.Sync()
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closure.object.EachStorage(func(key string, value *ethutil.Value) {
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value.Decode()
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fmt.Printf("%x %x\n", new(big.Int).SetBytes([]byte(key)).Bytes(), value.Bytes())
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})
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}
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b := pc.Bytes()
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if len(b) == 0 {
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b = []byte{0}
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}
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fmt.Printf("%x %x %x %x\n", closure.Address(), b, []byte{byte(op)}, closure.Gas.Bytes())
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}
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gas := new(big.Int)
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addStepGasUsage := func(amount *big.Int) {
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if amount.Cmp(ethutil.Big0) >= 0 {
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gas.Add(gas, amount)
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}
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}
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addStepGasUsage(GasStep)
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var newMemSize uint64 = 0
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switch op {
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case STOP:
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gas.Set(ethutil.Big0)
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case SUICIDE:
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gas.Set(ethutil.Big0)
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case SLOAD:
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gas.Set(GasSLoad)
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case SSTORE:
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var mult *big.Int
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y, x := stack.Peekn()
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val := closure.GetStorage(x)
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if val.BigInt().Cmp(ethutil.Big0) == 0 && len(y.Bytes()) > 0 {
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mult = ethutil.Big2
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} else if val.BigInt().Cmp(ethutil.Big0) != 0 && len(y.Bytes()) == 0 {
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mult = ethutil.Big0
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} else {
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mult = ethutil.Big1
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}
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gas = new(big.Int).Mul(mult, GasSStore)
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case BALANCE:
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gas.Set(GasBalance)
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case MSTORE:
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require(2)
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newMemSize = stack.Peek().Uint64() + 32
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case MLOAD:
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require(1)
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newMemSize = stack.Peek().Uint64() + 32
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case MSTORE8:
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require(2)
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newMemSize = stack.Peek().Uint64() + 1
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case RETURN:
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require(2)
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newMemSize = stack.Peek().Uint64() + stack.data[stack.Len()-2].Uint64()
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case SHA3:
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require(2)
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gas.Set(GasSha)
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newMemSize = stack.Peek().Uint64() + stack.data[stack.Len()-2].Uint64()
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case CALLDATACOPY:
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require(3)
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newMemSize = stack.Peek().Uint64() + stack.data[stack.Len()-3].Uint64()
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case CODECOPY:
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require(3)
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newMemSize = stack.Peek().Uint64() + stack.data[stack.Len()-3].Uint64()
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case CALL:
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require(7)
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gas.Set(GasCall)
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addStepGasUsage(stack.data[stack.Len()-1])
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x := stack.data[stack.Len()-6].Uint64() + stack.data[stack.Len()-7].Uint64()
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y := stack.data[stack.Len()-4].Uint64() + stack.data[stack.Len()-5].Uint64()
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newMemSize = uint64(math.Max(float64(x), float64(y)))
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case CREATE:
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require(3)
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gas.Set(GasCreate)
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newMemSize = stack.data[stack.Len()-2].Uint64() + stack.data[stack.Len()-3].Uint64()
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}
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newMemSize = (newMemSize + 31) / 32 * 32
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if newMemSize > uint64(mem.Len()) {
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m := GasMemory.Uint64() * (newMemSize - uint64(mem.Len())) / 32
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addStepGasUsage(big.NewInt(int64(m)))
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}
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if !closure.UseGas(gas) {
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err := fmt.Errorf("Insufficient gas for %v. req %v has %v", op, gas, closure.Gas)
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closure.UseGas(closure.Gas)
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return closure.Return(nil), err
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}
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vm.Printf("(pc) %-3d -o- %-14s", pc, op.String())
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vm.Printf(" (g) %-3v (%v)", gas, closure.Gas)
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mem.Resize(newMemSize)
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switch op {
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case LOG:
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stack.Print()
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mem.Print()
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// 0x20 range
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case ADD:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v + %v", y, x)
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base.Add(y, x)
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vm.Printf(" = %v", base)
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// Pop result back on the stack
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stack.Push(base)
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case SUB:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v - %v", y, x)
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base.Sub(y, x)
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vm.Printf(" = %v", base)
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// Pop result back on the stack
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stack.Push(base)
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case MUL:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v * %v", y, x)
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base.Mul(y, x)
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vm.Printf(" = %v", base)
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// Pop result back on the stack
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stack.Push(base)
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case DIV:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v / %v", y, x)
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base.Div(y, x)
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vm.Printf(" = %v", base)
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// Pop result back on the stack
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stack.Push(base)
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case SDIV:
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require(2)
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x, y := stack.Popn()
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// n > 2**255
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if x.Cmp(Pow256) > 0 {
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x.Sub(Pow256, x)
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}
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if y.Cmp(Pow256) > 0 {
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y.Sub(Pow256, y)
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}
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z := new(big.Int)
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z.Div(x, y)
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if z.Cmp(Pow256) > 0 {
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z.Sub(Pow256, z)
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}
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// Push result on to the stack
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stack.Push(z)
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case MOD:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v %% %v", y, x)
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base.Mod(y, x)
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vm.Printf(" = %v", base)
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stack.Push(base)
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case SMOD:
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require(2)
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x, y := stack.Popn()
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// n > 2**255
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if x.Cmp(Pow256) > 0 {
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x.Sub(Pow256, x)
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}
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if y.Cmp(Pow256) > 0 {
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y.Sub(Pow256, y)
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}
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z := new(big.Int)
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z.Mod(x, y)
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if z.Cmp(Pow256) > 0 {
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z.Sub(Pow256, z)
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}
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// Push result on to the stack
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stack.Push(z)
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case EXP:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v ** %v", y, x)
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base.Exp(y, x, Pow256)
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vm.Printf(" = %v", base)
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stack.Push(base)
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case NEG:
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require(1)
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base.Sub(Pow256, stack.Pop())
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stack.Push(base)
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case LT:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v < %v", y, x)
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// x < y
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if y.Cmp(x) < 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case GT:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v > %v", y, x)
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// x > y
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if y.Cmp(x) > 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case SLT:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v < %v", y, x)
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// x < y
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if y.Cmp(x) < 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case SGT:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v > %v", y, x)
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// x > y
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if y.Cmp(x) > 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case EQ:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v == %v", y, x)
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// x == y
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if x.Cmp(y) == 0 {
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stack.Push(ethutil.BigTrue)
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} else {
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stack.Push(ethutil.BigFalse)
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}
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case NOT:
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require(1)
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x := stack.Pop()
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if x.Cmp(ethutil.BigFalse) > 0 {
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stack.Push(ethutil.BigFalse)
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} else {
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stack.Push(ethutil.BigTrue)
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}
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// 0x10 range
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case AND:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v & %v", y, x)
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stack.Push(base.And(y, x))
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case OR:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v | %v", y, x)
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stack.Push(base.Or(y, x))
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case XOR:
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require(2)
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x, y := stack.Popn()
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vm.Printf(" %v ^ %v", y, x)
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stack.Push(base.Xor(y, x))
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case BYTE:
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require(2)
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val, th := stack.Popn()
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if th.Cmp(big.NewInt(32)) < 0 && th.Cmp(big.NewInt(int64(len(val.Bytes())))) < 0 {
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byt := big.NewInt(int64(val.Bytes()[th.Int64()]))
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stack.Push(byt)
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vm.Printf(" => 0x%x", byt.Bytes())
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} else {
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stack.Push(ethutil.BigFalse)
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}
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// 0x20 range
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case SHA3:
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require(2)
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size, offset := stack.Popn()
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data := ethcrypto.Sha3Bin(mem.Get(offset.Int64(), size.Int64()))
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stack.Push(ethutil.BigD(data))
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vm.Printf(" => %x", data)
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// 0x30 range
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case ADDRESS:
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stack.Push(ethutil.BigD(closure.Address()))
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vm.Printf(" => %x", closure.Address())
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case BALANCE:
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require(1)
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addr := stack.Pop().Bytes()
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balance := vm.state.GetBalance(addr)
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stack.Push(balance)
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vm.Printf(" => %v (%x)", balance, addr)
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case ORIGIN:
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stack.Push(ethutil.BigD(vm.vars.Origin))
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vm.Printf(" => %x", vm.vars.Origin)
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case CALLER:
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caller := closure.caller.Address()
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stack.Push(ethutil.BigD(caller))
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vm.Printf(" => %x", caller)
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case CALLVALUE:
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stack.Push(vm.vars.Value)
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vm.Printf(" => %v", vm.vars.Value)
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case CALLDATALOAD:
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require(1)
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var (
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offset = stack.Pop()
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data = make([]byte, 32)
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lenData = big.NewInt(int64(len(closure.Args)))
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)
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if lenData.Cmp(offset) >= 0 {
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length := new(big.Int).Add(offset, ethutil.Big32)
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length = ethutil.BigMin(length, lenData)
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copy(data, closure.Args[offset.Int64():length.Int64()])
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}
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vm.Printf(" => 0x%x", data)
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stack.Push(ethutil.BigD(data))
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case CALLDATASIZE:
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l := int64(len(closure.Args))
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stack.Push(big.NewInt(l))
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vm.Printf(" => %d", l)
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case CALLDATACOPY:
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var (
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size = int64(len(closure.Args))
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mOff = stack.Pop().Int64()
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cOff = stack.Pop().Int64()
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l = stack.Pop().Int64()
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)
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if cOff > size {
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cOff = 0
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l = 0
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} else if cOff+l > size {
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l = 0
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}
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code := closure.Args[cOff : cOff+l]
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mem.Set(mOff, l, code)
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case CODESIZE:
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l := big.NewInt(int64(len(closure.Script)))
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stack.Push(l)
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vm.Printf(" => %d", l)
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case CODECOPY:
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var (
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size = int64(len(closure.Script))
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mOff = stack.Pop().Int64()
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cOff = stack.Pop().Int64()
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l = stack.Pop().Int64()
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)
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if cOff > size {
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cOff = 0
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l = 0
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} else if cOff+l > size {
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l = 0
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}
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|
code := closure.Script[cOff : cOff+l]
|
|
//fmt.Println("len:", l, "code off:", cOff, "mem off:", mOff)
|
|
|
|
mem.Set(mOff, l, code)
|
|
//fmt.Println(Code(mem.Get(mOff, l)))
|
|
case GASPRICE:
|
|
stack.Push(closure.Price)
|
|
|
|
// 0x40 range
|
|
case PREVHASH:
|
|
stack.Push(ethutil.BigD(vm.vars.PrevHash))
|
|
case COINBASE:
|
|
stack.Push(ethutil.BigD(vm.vars.Coinbase))
|
|
case TIMESTAMP:
|
|
stack.Push(big.NewInt(vm.vars.Time))
|
|
case NUMBER:
|
|
stack.Push(vm.vars.BlockNumber)
|
|
case DIFFICULTY:
|
|
stack.Push(vm.vars.Diff)
|
|
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
|
|
|
|
vm.Printf(" => 0x%x", data.Bytes())
|
|
case POP:
|
|
require(1)
|
|
stack.Pop()
|
|
case DUP:
|
|
require(1)
|
|
stack.Push(stack.Peek())
|
|
|
|
vm.Printf(" => 0x%x", stack.Peek().Bytes())
|
|
case SWAP:
|
|
require(2)
|
|
x, y := stack.Popn()
|
|
stack.Push(y)
|
|
stack.Push(x)
|
|
case MLOAD:
|
|
require(1)
|
|
offset := stack.Pop()
|
|
val := ethutil.BigD(mem.Get(offset.Int64(), 32))
|
|
stack.Push(val)
|
|
|
|
vm.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))
|
|
|
|
vm.Printf(" => 0x%x", val)
|
|
case MSTORE8:
|
|
require(2)
|
|
val, mStart := stack.Popn()
|
|
//base.And(val, new(big.Int).SetInt64(0xff))
|
|
//mem.Set(mStart.Int64(), 32, ethutil.BigToBytes(base, 256))
|
|
mem.store[mStart.Int64()] = byte(val.Int64() & 0xff)
|
|
|
|
vm.Printf(" => 0x%x", val)
|
|
case SLOAD:
|
|
require(1)
|
|
loc := stack.Pop()
|
|
val := closure.GetStorage(loc)
|
|
|
|
stack.Push(val.BigInt())
|
|
|
|
vm.Printf(" {0x%x : 0x%x}", loc.Bytes(), val.Bytes())
|
|
case SSTORE:
|
|
require(2)
|
|
val, loc := stack.Popn()
|
|
closure.SetStorage(loc, ethutil.NewValue(val))
|
|
|
|
// Add the change to manifest
|
|
vm.state.manifest.AddStorageChange(closure.Object(), loc.Bytes(), val)
|
|
|
|
vm.Printf(" {0x%x : 0x%x}", loc, val)
|
|
case JUMP:
|
|
require(1)
|
|
pc = stack.Pop()
|
|
// Reduce pc by one because of the increment that's at the end of this for loop
|
|
vm.Printf(" ~> %v", pc).Endl()
|
|
|
|
continue
|
|
case JUMPI:
|
|
require(2)
|
|
cond, pos := stack.Popn()
|
|
if cond.Cmp(ethutil.BigTrue) >= 0 {
|
|
pc = pos
|
|
|
|
vm.Printf(" ~> %v (t)", pc).Endl()
|
|
|
|
continue
|
|
} else {
|
|
vm.Printf(" (f)")
|
|
}
|
|
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()
|
|
|
|
// Snapshot the current stack so we are able to
|
|
// revert back to it later.
|
|
snapshot = vm.state.Copy()
|
|
)
|
|
|
|
// Generate a new address
|
|
addr := ethcrypto.CreateAddress(closure.Address(), closure.N().Uint64())
|
|
for i := uint64(0); vm.state.GetStateObject(addr) != nil; i++ {
|
|
ethcrypto.CreateAddress(closure.Address(), closure.N().Uint64()+i)
|
|
}
|
|
closure.object.Nonce++
|
|
|
|
vm.Printf(" (*) %x", addr).Endl()
|
|
|
|
// Create a new contract
|
|
contract := vm.state.NewStateObject(addr)
|
|
if contract.Amount.Cmp(value) >= 0 {
|
|
closure.object.SubAmount(value)
|
|
contract.AddAmount(value)
|
|
|
|
// Set the init script
|
|
initCode := mem.Get(offset.Int64(), size.Int64())
|
|
//fmt.Printf("%x\n", initCode)
|
|
// Transfer all remaining gas to the new
|
|
// contract so it may run the init script
|
|
gas := new(big.Int).Set(closure.Gas)
|
|
closure.UseGas(closure.Gas)
|
|
|
|
// Create the closure
|
|
c := NewClosure(closure, contract, initCode, vm.state, gas, closure.Price)
|
|
// Call the closure and set the return value as
|
|
// main script.
|
|
contract.script, err = Call(vm, c, nil)
|
|
} else {
|
|
err = fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", value, closure.object.Amount)
|
|
}
|
|
|
|
if err != nil {
|
|
stack.Push(ethutil.BigFalse)
|
|
|
|
// Revert the state as it was before.
|
|
vm.state.Set(snapshot)
|
|
|
|
vm.Printf("CREATE err %v", err)
|
|
} else {
|
|
stack.Push(ethutil.BigD(addr))
|
|
vm.Printf("CREATE success")
|
|
}
|
|
vm.Endl()
|
|
|
|
// Debug hook
|
|
if vm.Dbg != nil {
|
|
vm.Dbg.SetCode(closure.Script)
|
|
}
|
|
case CALL:
|
|
require(7)
|
|
|
|
vm.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())
|
|
|
|
if closure.object.Amount.Cmp(value) < 0 {
|
|
vmlogger.Debugf("Insufficient funds to transfer value. Req %v, has %v", value, closure.object.Amount)
|
|
|
|
closure.ReturnGas(gas, nil, nil)
|
|
|
|
stack.Push(ethutil.BigFalse)
|
|
} else {
|
|
snapshot := vm.state.Copy()
|
|
|
|
stateObject := vm.state.GetOrNewStateObject(addr.Bytes())
|
|
|
|
closure.object.SubAmount(value)
|
|
stateObject.AddAmount(value)
|
|
|
|
// Create a new callable closure
|
|
c := NewClosure(closure, stateObject, stateObject.script, vm.state, gas, closure.Price)
|
|
// Executer the closure and get the return value (if any)
|
|
ret, err := Call(vm, c, args)
|
|
if err != nil {
|
|
stack.Push(ethutil.BigFalse)
|
|
|
|
vmlogger.Debugf("Closure execution failed. %v\n", err)
|
|
|
|
vm.state.Set(snapshot)
|
|
} else {
|
|
stack.Push(ethutil.BigTrue)
|
|
|
|
mem.Set(retOffset.Int64(), retSize.Int64(), ret)
|
|
}
|
|
|
|
// Debug hook
|
|
if vm.Dbg != nil {
|
|
vm.Dbg.SetCode(closure.Script)
|
|
}
|
|
}
|
|
case RETURN:
|
|
require(2)
|
|
size, offset := stack.Popn()
|
|
ret := mem.Get(offset.Int64(), size.Int64())
|
|
|
|
vm.Printf(" => (%d) 0x%x", len(ret), ret).Endl()
|
|
|
|
return closure.Return(ret), nil
|
|
case SUICIDE:
|
|
require(1)
|
|
|
|
receiver := vm.state.GetOrNewStateObject(stack.Pop().Bytes())
|
|
|
|
receiver.AddAmount(closure.object.Amount)
|
|
|
|
closure.object.MarkForDeletion()
|
|
|
|
fallthrough
|
|
case STOP: // Stop the closure
|
|
vm.Endl()
|
|
|
|
return closure.Return(nil), nil
|
|
default:
|
|
vmlogger.Debugf("(pc) %-3v Invalid opcode %x\n", pc, op)
|
|
fmt.Println(Code(closure.Script))
|
|
|
|
return closure.Return(nil), fmt.Errorf("Invalid opcode %x", op)
|
|
}
|
|
|
|
pc.Add(pc, ethutil.Big1)
|
|
|
|
vm.Endl()
|
|
|
|
if vm.Dbg != nil {
|
|
for _, instrNo := range vm.Dbg.BreakPoints() {
|
|
if pc.Cmp(big.NewInt(instrNo)) == 0 {
|
|
vm.Stepping = true
|
|
|
|
if !vm.Dbg.BreakHook(prevStep, op, mem, stack, closure.Object()) {
|
|
return nil, nil
|
|
}
|
|
} else if vm.Stepping {
|
|
if !vm.Dbg.StepHook(prevStep, op, mem, stack, closure.Object()) {
|
|
return nil, nil
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|