102 lines
2.6 KiB
Go
102 lines
2.6 KiB
Go
package core
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/params"
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)
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type Execution struct {
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env vm.Environment
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address *common.Address
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input []byte
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evm vm.VirtualMachine
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Gas, price, value *big.Int
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}
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func NewExecution(env vm.Environment, address *common.Address, input []byte, gas, gasPrice, value *big.Int) *Execution {
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exe := &Execution{env: env, address: address, input: input, Gas: gas, price: gasPrice, value: value}
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exe.evm = vm.NewVm(env)
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return exe
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}
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func (self *Execution) Call(codeAddr common.Address, caller vm.ContextRef) ([]byte, error) {
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// Retrieve the executing code
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code := self.env.State().GetCode(codeAddr)
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return self.exec(&codeAddr, code, caller)
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}
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func (self *Execution) Create(caller vm.ContextRef) (ret []byte, err error, account *state.StateObject) {
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// Input must be nil for create
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code := self.input
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self.input = nil
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ret, err = self.exec(nil, code, caller)
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// Here we get an error if we run into maximum stack depth,
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// See: https://github.com/ethereum/yellowpaper/pull/131
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// and YP definitions for CREATE instruction
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if err != nil {
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return nil, err, nil
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}
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account = self.env.State().GetStateObject(*self.address)
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return
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}
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func (self *Execution) exec(contextAddr *common.Address, code []byte, caller vm.ContextRef) (ret []byte, err error) {
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env := self.env
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evm := self.evm
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if env.Depth() > int(params.CallCreateDepth.Int64()) {
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caller.ReturnGas(self.Gas, self.price)
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return nil, vm.DepthError
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}
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vsnapshot := env.State().Copy()
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var createAccount bool
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if self.address == nil {
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// Generate a new address
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nonce := env.State().GetNonce(caller.Address())
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env.State().SetNonce(caller.Address(), nonce+1)
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addr := crypto.CreateAddress(caller.Address(), nonce)
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self.address = &addr
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createAccount = true
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}
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snapshot := env.State().Copy()
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var (
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from = env.State().GetStateObject(caller.Address())
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to *state.StateObject
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)
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if createAccount {
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to = env.State().CreateAccount(*self.address)
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} else {
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to = env.State().GetOrNewStateObject(*self.address)
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}
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err = env.Transfer(from, to, self.value)
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if err != nil {
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env.State().Set(vsnapshot)
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caller.ReturnGas(self.Gas, self.price)
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return nil, ValueTransferErr("insufficient funds to transfer value. Req %v, has %v", self.value, from.Balance())
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}
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context := vm.NewContext(caller, to, self.value, self.Gas, self.price)
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context.SetCallCode(contextAddr, code)
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ret, err = evm.Run(context, self.input)
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if err != nil {
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env.State().Set(snapshot)
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}
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return
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}
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