package ethvm import ( "fmt" "math/big" "github.com/ethereum/eth-go/ethstate" "github.com/ethereum/eth-go/ethutil" ) type Execution struct { vm VirtualMachine closure *Closure address, input []byte gas, price, value *big.Int object *ethstate.StateObject } func NewExecution(vm VirtualMachine, address, input []byte, gas, gasPrice, value *big.Int) *Execution { return &Execution{vm: vm, address: address, input: input, gas: gas, price: gasPrice, value: value} } func (self *Execution) Addr() []byte { return self.address } func (self *Execution) Exec(codeAddr []byte, caller ClosureRef) (ret []byte, err error) { env := self.vm.Env() snapshot := env.State().Copy() defer func() { if err != nil { env.State().Set(snapshot) } }() msg := env.State().Manifest().AddMessage(ðstate.Message{ To: self.address, From: caller.Address(), Input: self.input, Origin: env.Origin(), Block: env.BlockHash(), Timestamp: env.Time(), Coinbase: env.Coinbase(), Number: env.BlockNumber(), Value: self.value, }) object := caller.Object() if object.Balance.Cmp(self.value) < 0 { caller.ReturnGas(self.gas, self.price) err = fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, object.Balance) } else { stateObject := env.State().GetOrNewStateObject(self.address) self.object = stateObject caller.Object().SubAmount(self.value) stateObject.AddAmount(self.value) // Pre-compiled contracts (address.go) 1, 2 & 3. naddr := ethutil.BigD(codeAddr).Uint64() if p := Precompiled[naddr]; p != nil { if self.gas.Cmp(p.Gas) >= 0 { ret = p.Call(self.input) self.vm.Printf("NATIVE_FUNC(%x) => %x", naddr, ret) } } else { if self.vm.Depth() == MaxCallDepth { return nil, fmt.Errorf("Max call depth exceeded (%d)", MaxCallDepth) } // Retrieve the executing code code := env.State().GetCode(codeAddr) // Create a new callable closure c := NewClosure(msg, caller, stateObject, code, self.gas, self.price) c.exe = self // Executer the closure and get the return value (if any) ret, _, err = c.Call(self.vm, self.input) msg.Output = ret } } return }