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package core
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, contextAddr []byte, caller vm.ClosureRef) (ret []byte, err error) {
env := self.vm.Env()
chainlogger.Debugf("pre 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)
}
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())
}()
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(contextAddr).Uint64()
if p := vm.Precompiled[naddr]; p != nil {
if self.Gas.Cmp(p.Gas(len(self.input))) >= 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
}
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