2016-04-14 16:18:24 +00:00
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// Copyright 2015 The go-ethereum Authors
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2015-10-09 12:56:12 +00:00
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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 runtime
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import (
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2017-01-04 19:17:24 +00:00
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"math"
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/common"
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2018-09-24 12:57:49 +00:00
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"github.com/ethereum/go-ethereum/core/rawdb"
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2015-10-09 12:56:12 +00:00
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"github.com/ethereum/go-ethereum/core/state"
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2016-12-06 01:16:03 +00:00
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"github.com/ethereum/go-ethereum/core/vm"
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2015-10-09 12:56:12 +00:00
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"github.com/ethereum/go-ethereum/crypto"
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2016-10-07 22:23:45 +00:00
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"github.com/ethereum/go-ethereum/params"
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2015-10-09 12:56:12 +00:00
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)
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2016-03-15 18:08:18 +00:00
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// Config is a basic type specifying certain configuration flags for running
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// the EVM.
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type Config struct {
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ChainConfig *params.ChainConfig
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Difficulty *big.Int
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Origin common.Address
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Coinbase common.Address
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BlockNumber *big.Int
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Time *big.Int
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GasLimit uint64
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GasPrice *big.Int
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Value *big.Int
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Debug bool
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EVMConfig vm.Config
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State *state.StateDB
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GetHashFn func(n uint64) common.Hash
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}
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// sets defaults on the config
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func setDefaults(cfg *Config) {
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if cfg.ChainConfig == nil {
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cfg.ChainConfig = ¶ms.ChainConfig{
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ChainID: big.NewInt(1),
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HomesteadBlock: new(big.Int),
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DAOForkBlock: new(big.Int),
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DAOForkSupport: false,
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EIP150Block: new(big.Int),
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EIP155Block: new(big.Int),
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EIP158Block: new(big.Int),
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}
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}
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if cfg.Difficulty == nil {
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cfg.Difficulty = new(big.Int)
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}
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if cfg.Time == nil {
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cfg.Time = big.NewInt(time.Now().Unix())
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}
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if cfg.GasLimit == 0 {
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cfg.GasLimit = math.MaxUint64
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}
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if cfg.GasPrice == nil {
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cfg.GasPrice = new(big.Int)
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}
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if cfg.Value == nil {
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cfg.Value = new(big.Int)
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}
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if cfg.BlockNumber == nil {
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cfg.BlockNumber = new(big.Int)
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}
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if cfg.GetHashFn == nil {
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cfg.GetHashFn = func(n uint64) common.Hash {
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return common.BytesToHash(crypto.Keccak256([]byte(new(big.Int).SetUint64(n).String())))
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}
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}
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}
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// Execute executes the code using the input as call data during the execution.
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// It returns the EVM's return value, the new state and an error if it failed.
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//
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// Execute sets up an in-memory, temporary, environment for the execution of
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// the given code. It makes sure that it's restored to its original state afterwards.
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func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error) {
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if cfg == nil {
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cfg = new(Config)
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}
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setDefaults(cfg)
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if cfg.State == nil {
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cfg.State, _ = state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
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}
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var (
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address = common.BytesToAddress([]byte("contract"))
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vmenv = NewEnv(cfg)
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sender = vm.AccountRef(cfg.Origin)
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)
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cfg.State.CreateAccount(address)
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// set the receiver's (the executing contract) code for execution.
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cfg.State.SetCode(address, code)
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// Call the code with the given configuration.
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ret, _, err := vmenv.Call(
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sender,
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common.BytesToAddress([]byte("contract")),
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input,
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cfg.GasLimit,
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cfg.Value,
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)
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2016-02-09 22:20:42 +00:00
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return ret, cfg.State, err
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}
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2016-12-06 01:16:03 +00:00
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// Create executes the code using the EVM create method
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func Create(input []byte, cfg *Config) ([]byte, common.Address, uint64, error) {
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if cfg == nil {
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cfg = new(Config)
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}
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setDefaults(cfg)
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if cfg.State == nil {
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cfg.State, _ = state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
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}
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var (
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vmenv = NewEnv(cfg)
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sender = vm.AccountRef(cfg.Origin)
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)
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// Call the code with the given configuration.
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code, address, leftOverGas, err := vmenv.Create(
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sender,
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input,
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cfg.GasLimit,
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cfg.Value,
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)
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return code, address, leftOverGas, err
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}
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// Call executes the code given by the contract's address. It will return the
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// EVM's return value or an error if it failed.
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//
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// Call, unlike Execute, requires a config and also requires the State field to
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// be set.
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func Call(address common.Address, input []byte, cfg *Config) ([]byte, uint64, error) {
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setDefaults(cfg)
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2017-08-11 11:29:32 +00:00
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vmenv := NewEnv(cfg)
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sender := cfg.State.GetOrNewStateObject(cfg.Origin)
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// Call the code with the given configuration.
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ret, leftOverGas, err := vmenv.Call(
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sender,
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address,
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input,
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cfg.GasLimit,
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cfg.Value,
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)
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2017-06-07 15:09:08 +00:00
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return ret, leftOverGas, err
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}
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