361082ec4b
* Moved `vm.Transfer` to `core` package and changed execution to call `env.Transfer` instead of `core.Transfer` directly. * core/vm: byte code VM moved to jump table instead of switch * Moved `vm.Transfer` to `core` package and changed execution to call `env.Transfer` instead of `core.Transfer` directly. * Byte code VM now shares the same code as the JITVM * Renamed Context to Contract * Changed initialiser of state transition & unexported methods * Removed the Execution object and refactor `Call`, `CallCode` & `Create` in to their own functions instead of being methods. * Removed the hard dep on the state for the VM. The VM now depends on a Database interface returned by the environment. In the process the core now depends less on the statedb by usage of the env * Moved `Log` from package `core/state` to package `core/vm`.
121 lines
3.9 KiB
Go
121 lines
3.9 KiB
Go
// Copyright 2014 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package core
|
|
|
|
import (
|
|
"errors"
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core/vm"
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
"github.com/ethereum/go-ethereum/params"
|
|
)
|
|
|
|
// Call executes within the given contract
|
|
func Call(env vm.Environment, caller vm.ContractRef, addr common.Address, input []byte, gas, gasPrice, value *big.Int) (ret []byte, err error) {
|
|
ret, _, err = exec(env, caller, &addr, &addr, input, env.Db().GetCode(addr), gas, gasPrice, value)
|
|
return ret, err
|
|
}
|
|
|
|
// CallCode executes the given address' code as the given contract address
|
|
func CallCode(env vm.Environment, caller vm.ContractRef, addr common.Address, input []byte, gas, gasPrice, value *big.Int) (ret []byte, err error) {
|
|
prev := caller.Address()
|
|
ret, _, err = exec(env, caller, &prev, &addr, input, env.Db().GetCode(addr), gas, gasPrice, value)
|
|
return ret, err
|
|
}
|
|
|
|
// Create creates a new contract with the given code
|
|
func Create(env vm.Environment, caller vm.ContractRef, code []byte, gas, gasPrice, value *big.Int) (ret []byte, address common.Address, err error) {
|
|
ret, address, err = exec(env, caller, nil, nil, nil, code, gas, gasPrice, value)
|
|
// Here we get an error if we run into maximum stack depth,
|
|
// See: https://github.com/ethereum/yellowpaper/pull/131
|
|
// and YP definitions for CREATE instruction
|
|
if err != nil {
|
|
return nil, address, err
|
|
}
|
|
return ret, address, err
|
|
}
|
|
|
|
func exec(env vm.Environment, caller vm.ContractRef, address, codeAddr *common.Address, input, code []byte, gas, gasPrice, value *big.Int) (ret []byte, addr common.Address, err error) {
|
|
evm := vm.NewVm(env)
|
|
|
|
// Depth check execution. Fail if we're trying to execute above the
|
|
// limit.
|
|
if env.Depth() > int(params.CallCreateDepth.Int64()) {
|
|
caller.ReturnGas(gas, gasPrice)
|
|
|
|
return nil, common.Address{}, vm.DepthError
|
|
}
|
|
|
|
if !env.CanTransfer(caller.Address(), value) {
|
|
caller.ReturnGas(gas, gasPrice)
|
|
|
|
return nil, common.Address{}, ValueTransferErr("insufficient funds to transfer value. Req %v, has %v", value, env.Db().GetBalance(caller.Address()))
|
|
}
|
|
|
|
var createAccount bool
|
|
if address == nil {
|
|
// Generate a new address
|
|
nonce := env.Db().GetNonce(caller.Address())
|
|
env.Db().SetNonce(caller.Address(), nonce+1)
|
|
|
|
addr = crypto.CreateAddress(caller.Address(), nonce)
|
|
|
|
address = &addr
|
|
createAccount = true
|
|
}
|
|
snapshot := env.MakeSnapshot()
|
|
|
|
var (
|
|
from = env.Db().GetAccount(caller.Address())
|
|
to vm.Account
|
|
)
|
|
if createAccount {
|
|
to = env.Db().CreateAccount(*address)
|
|
} else {
|
|
if !env.Db().Exist(*address) {
|
|
to = env.Db().CreateAccount(*address)
|
|
} else {
|
|
to = env.Db().GetAccount(*address)
|
|
}
|
|
}
|
|
env.Transfer(from, to, value)
|
|
|
|
contract := vm.NewContract(caller, to, value, gas, gasPrice)
|
|
contract.SetCallCode(codeAddr, code)
|
|
|
|
ret, err = evm.Run(contract, input)
|
|
if err != nil {
|
|
env.SetSnapshot(snapshot) //env.Db().Set(snapshot)
|
|
}
|
|
|
|
return ret, addr, err
|
|
}
|
|
|
|
// generic transfer method
|
|
func Transfer(from, to vm.Account, amount *big.Int) error {
|
|
if from.Balance().Cmp(amount) < 0 {
|
|
return errors.New("Insufficient balance in account")
|
|
}
|
|
|
|
from.SubBalance(amount)
|
|
to.AddBalance(amount)
|
|
|
|
return nil
|
|
}
|