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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
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"errors"
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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/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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// Call executes within the given contract
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func Call(env vm.Environment, caller vm.ContractRef, addr common.Address, input []byte, gas, gasPrice, value *big.Int) (ret []byte, err error) {
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ret, _, err = exec(env, caller, &addr, &addr, input, env.Db().GetCode(addr), gas, gasPrice, value)
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return ret, err
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}
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// CallCode executes the given address' code as the given contract address
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func CallCode(env vm.Environment, caller vm.ContractRef, addr common.Address, input []byte, gas, gasPrice, value *big.Int) (ret []byte, err error) {
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prev := caller.Address()
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ret, _, err = exec(env, caller, &prev, &addr, input, env.Db().GetCode(addr), gas, gasPrice, value)
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return ret, err
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}
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// Create creates a new contract with the given code
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func Create(env vm.Environment, caller vm.ContractRef, code []byte, gas, gasPrice, value *big.Int) (ret []byte, address common.Address, err error) {
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ret, address, err = exec(env, caller, nil, nil, nil, code, gas, gasPrice, value)
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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, address, err
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}
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return ret, address, err
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}
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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) {
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evm := vm.NewVm(env)
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// Depth check execution. Fail if we're trying to execute above the
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// limit.
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if env.Depth() > int(params.CallCreateDepth.Int64()) {
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caller.ReturnGas(gas, gasPrice)
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return nil, common.Address{}, vm.DepthError
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}
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if !env.CanTransfer(caller.Address(), value) {
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caller.ReturnGas(gas, gasPrice)
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return nil, common.Address{}, ValueTransferErr("insufficient funds to transfer value. Req %v, has %v", value, env.Db().GetBalance(caller.Address()))
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}
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var createAccount bool
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if address == nil {
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// Generate a new address
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nonce := env.Db().GetNonce(caller.Address())
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env.Db().SetNonce(caller.Address(), nonce+1)
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addr = crypto.CreateAddress(caller.Address(), nonce)
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address = &addr
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createAccount = true
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}
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snapshot := env.MakeSnapshot()
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var (
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from = env.Db().GetAccount(caller.Address())
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to vm.Account
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)
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if createAccount {
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to = env.Db().CreateAccount(*address)
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} else {
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if !env.Db().Exist(*address) {
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to = env.Db().CreateAccount(*address)
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} else {
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to = env.Db().GetAccount(*address)
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}
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}
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env.Transfer(from, to, value)
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contract := vm.NewContract(caller, to, value, gas, gasPrice)
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contract.SetCallCode(codeAddr, code)
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ret, err = evm.Run(contract, input)
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if err != nil {
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env.SetSnapshot(snapshot) //env.Db().Set(snapshot)
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}
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return ret, addr, err
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}
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// generic transfer method
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func Transfer(from, to vm.Account, amount *big.Int) error {
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if from.Balance().Cmp(amount) < 0 {
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return errors.New("Insufficient balance in account")
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}
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from.SubBalance(amount)
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to.AddBalance(amount)
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return nil
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}
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