94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
package ethvm
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/eth-go/ethstate"
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"github.com/ethereum/eth-go/ethutil"
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)
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type Execution struct {
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vm VirtualMachine
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address, input []byte
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Gas, price, value *big.Int
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object *ethstate.StateObject
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}
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func NewExecution(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) Exec(codeAddr []byte, caller 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 ClosureRef) (ret []byte, err error) {
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env := self.vm.Env()
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snapshot := env.State().Copy()
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defer func() {
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if err != nil {
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env.State().Set(snapshot)
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}
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}()
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msg := env.State().Manifest().AddMessage(ðstate.Message{
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To: self.address, From: caller.Address(),
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Input: self.input,
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Origin: env.Origin(),
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Block: env.BlockHash(), Timestamp: env.Time(), Coinbase: env.Coinbase(), Number: env.BlockNumber(),
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Value: self.value,
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})
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object := caller.Object()
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if object.Balance.Cmp(self.value) < 0 {
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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, object.Balance)
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} else {
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stateObject := env.State().GetOrNewStateObject(self.address)
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self.object = stateObject
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caller.Object().SubAmount(self.value)
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stateObject.AddAmount(self.value)
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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 := 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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}
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} else {
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// Create a new callable closure
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c := NewClosure(msg, caller, stateObject, code, self.Gas, self.price)
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c.exe = self
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if self.vm.Depth() == MaxCallDepth {
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c.UseGas(c.Gas)
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return c.Return(nil), fmt.Errorf("Max call depth exceeded (%d)", MaxCallDepth)
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}
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// Executer the closure and get the return value (if any)
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ret, _, err = c.Call(self.vm, self.input)
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msg.Output = ret
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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 ClosureRef) (ret []byte, err error) {
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return self.exec(self.input, nil, caller)
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}
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