81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
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package chain
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/state"
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"github.com/ethereum/go-ethereum/vm"
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)
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type Execution struct {
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vm vm.VirtualMachine
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address, input []byte
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Gas, price, value *big.Int
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object *state.StateObject
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SkipTransfer bool
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}
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func NewExecution(vm vm.VirtualMachine, address, input []byte, gas, gasPrice, value *big.Int) *Execution {
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return &Execution{vm: vm, address: address, input: input, Gas: gas, price: gasPrice, value: value}
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}
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func (self *Execution) Addr() []byte {
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return self.address
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}
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func (self *Execution) Call(codeAddr []byte, caller vm.ClosureRef) ([]byte, error) {
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// Retrieve the executing code
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code := self.vm.Env().State().GetCode(codeAddr)
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return self.exec(code, codeAddr, caller)
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}
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func (self *Execution) exec(code, caddr []byte, caller vm.ClosureRef) (ret []byte, err error) {
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env := self.vm.Env()
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chainlogger.Debugf("pre state %x\n", env.State().Root())
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snapshot := env.State().Copy()
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defer func() {
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if vm.IsDepthErr(err) || vm.IsOOGErr(err) {
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env.State().Set(snapshot)
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}
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chainlogger.Debugf("post state %x\n", env.State().Root())
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}()
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from, to := env.State().GetStateObject(caller.Address()), env.State().GetOrNewStateObject(self.address)
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// Skipping transfer is used on testing for the initial call
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if !self.SkipTransfer {
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err = env.Transfer(from, to, self.value)
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}
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if err != nil {
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caller.ReturnGas(self.Gas, self.price)
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err = fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, from.Balance)
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} else {
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self.object = to
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// Pre-compiled contracts (address.go) 1, 2 & 3.
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naddr := ethutil.BigD(caddr).Uint64()
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if p := vm.Precompiled[naddr]; p != nil {
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if self.Gas.Cmp(p.Gas) >= 0 {
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ret = p.Call(self.input)
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self.vm.Printf("NATIVE_FUNC(%x) => %x", naddr, ret)
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self.vm.Endl()
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}
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} else {
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ret, err = self.vm.Run(to, caller, code, self.value, self.Gas, self.price, self.input)
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}
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}
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return
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}
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func (self *Execution) Create(caller vm.ClosureRef) (ret []byte, err error, account *state.StateObject) {
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ret, err = self.exec(self.input, nil, caller)
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account = self.vm.Env().State().GetStateObject(self.address)
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return
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}
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