package chain import ( "fmt" "math/big" "github.com/ethereum/go-ethereum/ethutil" "github.com/ethereum/go-ethereum/state" "github.com/ethereum/go-ethereum/vm" ) type Execution struct { vm vm.VirtualMachine address, input []byte Gas, price, value *big.Int object *state.StateObject SkipTransfer bool } func NewExecution(vm 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) Call(codeAddr []byte, caller vm.ClosureRef) ([]byte, error) { // Retrieve the executing code code := self.vm.Env().State().GetCode(codeAddr) return self.exec(code, codeAddr, caller) } func (self *Execution) exec(code, caddr []byte, caller vm.ClosureRef) (ret []byte, err error) { env := self.vm.Env() chainlogger.Debugf("pre state %x\n", env.State().Root()) snapshot := env.State().Copy() defer func() { if vm.IsDepthErr(err) || vm.IsOOGErr(err) { env.State().Set(snapshot) } chainlogger.Debugf("post state %x\n", env.State().Root()) }() from, to := env.State().GetStateObject(caller.Address()), env.State().GetOrNewStateObject(self.address) // Skipping transfer is used on testing for the initial call if !self.SkipTransfer { err = env.Transfer(from, to, self.value) } if err != nil { caller.ReturnGas(self.Gas, self.price) err = fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, from.Balance) } else { self.object = to // Pre-compiled contracts (address.go) 1, 2 & 3. naddr := ethutil.BigD(caddr).Uint64() if p := vm.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) self.vm.Endl() } } else { ret, err = self.vm.Run(to, caller, code, self.value, self.Gas, self.price, self.input) } } return } func (self *Execution) Create(caller vm.ClosureRef) (ret []byte, err error, account *state.StateObject) { ret, err = self.exec(self.input, nil, caller) account = self.vm.Env().State().GetStateObject(self.address) return }