github.com/codingfuture/orig-energi3@v0.8.4/core/vm/runtime/runtime.go (about)

     1  // Copyright 2018 The Energi Core Authors
     2  // Copyright 2015 The go-ethereum Authors
     3  // This file is part of the Energi Core library.
     4  //
     5  // The Energi Core library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Lesser General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // The Energi Core library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  // GNU Lesser General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public License
    16  // along with the Energi Core library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package runtime
    19  
    20  import (
    21  	"math"
    22  	"math/big"
    23  	"time"
    24  
    25  	"github.com/ethereum/go-ethereum/common"
    26  	"github.com/ethereum/go-ethereum/core/state"
    27  	"github.com/ethereum/go-ethereum/core/vm"
    28  	"github.com/ethereum/go-ethereum/crypto"
    29  	"github.com/ethereum/go-ethereum/ethdb"
    30  	"github.com/ethereum/go-ethereum/params"
    31  )
    32  
    33  // Config is a basic type specifying certain configuration flags for running
    34  // the EVM.
    35  type Config struct {
    36  	ChainConfig *params.ChainConfig
    37  	Difficulty  *big.Int
    38  	Origin      common.Address
    39  	Coinbase    common.Address
    40  	BlockNumber *big.Int
    41  	Time        *big.Int
    42  	GasLimit    uint64
    43  	GasPrice    *big.Int
    44  	Value       *big.Int
    45  	Debug       bool
    46  	EVMConfig   vm.Config
    47  
    48  	State     *state.StateDB
    49  	GetHashFn func(n uint64) common.Hash
    50  }
    51  
    52  // sets defaults on the config
    53  func setDefaults(cfg *Config) {
    54  	if cfg.ChainConfig == nil {
    55  		cfg.ChainConfig = &params.ChainConfig{
    56  			ChainID:        big.NewInt(1),
    57  			HomesteadBlock: new(big.Int),
    58  			EIP150Block:    new(big.Int),
    59  			EIP155Block:    new(big.Int),
    60  			EIP158Block:    new(big.Int),
    61  		}
    62  	}
    63  
    64  	if cfg.Difficulty == nil {
    65  		cfg.Difficulty = new(big.Int)
    66  	}
    67  	if cfg.Time == nil {
    68  		cfg.Time = big.NewInt(time.Now().Unix())
    69  	}
    70  	if cfg.GasLimit == 0 {
    71  		cfg.GasLimit = math.MaxUint64
    72  	}
    73  	if cfg.GasPrice == nil {
    74  		cfg.GasPrice = new(big.Int)
    75  	}
    76  	if cfg.Value == nil {
    77  		cfg.Value = new(big.Int)
    78  	}
    79  	if cfg.BlockNumber == nil {
    80  		cfg.BlockNumber = new(big.Int)
    81  	}
    82  	if cfg.GetHashFn == nil {
    83  		cfg.GetHashFn = func(n uint64) common.Hash {
    84  			return common.BytesToHash(crypto.Keccak256([]byte(new(big.Int).SetUint64(n).String())))
    85  		}
    86  	}
    87  }
    88  
    89  // Execute executes the code using the input as call data during the execution.
    90  // It returns the EVM's return value, the new state and an error if it failed.
    91  //
    92  // Executes sets up a in memory, temporarily, environment for the execution of
    93  // the given code. It makes sure that it's restored to it's original state afterwards.
    94  func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error) {
    95  	if cfg == nil {
    96  		cfg = new(Config)
    97  	}
    98  	setDefaults(cfg)
    99  
   100  	if cfg.State == nil {
   101  		cfg.State, _ = state.New(common.Hash{}, state.NewDatabase(ethdb.NewMemDatabase()))
   102  	}
   103  	var (
   104  		address = common.BytesToAddress([]byte("contract"))
   105  		vmenv   = NewEnv(cfg)
   106  		sender  = vm.AccountRef(cfg.Origin)
   107  	)
   108  	cfg.State.CreateAccount(address)
   109  	// set the receiver's (the executing contract) code for execution.
   110  	cfg.State.SetCode(address, code)
   111  	// Call the code with the given configuration.
   112  	ret, _, err := vmenv.Call(
   113  		sender,
   114  		common.BytesToAddress([]byte("contract")),
   115  		input,
   116  		cfg.GasLimit,
   117  		cfg.Value,
   118  	)
   119  
   120  	return ret, cfg.State, err
   121  }
   122  
   123  // Create executes the code using the EVM create method
   124  func Create(input []byte, cfg *Config) ([]byte, common.Address, uint64, error) {
   125  	if cfg == nil {
   126  		cfg = new(Config)
   127  	}
   128  	setDefaults(cfg)
   129  
   130  	if cfg.State == nil {
   131  		cfg.State, _ = state.New(common.Hash{}, state.NewDatabase(ethdb.NewMemDatabase()))
   132  	}
   133  	var (
   134  		vmenv  = NewEnv(cfg)
   135  		sender = vm.AccountRef(cfg.Origin)
   136  	)
   137  
   138  	// Call the code with the given configuration.
   139  	code, address, leftOverGas, err := vmenv.Create(
   140  		sender,
   141  		input,
   142  		cfg.GasLimit,
   143  		cfg.Value,
   144  	)
   145  	return code, address, leftOverGas, err
   146  }
   147  
   148  // Call executes the code given by the contract's address. It will return the
   149  // EVM's return value or an error if it failed.
   150  //
   151  // Call, unlike Execute, requires a config and also requires the State field to
   152  // be set.
   153  func Call(address common.Address, input []byte, cfg *Config) ([]byte, uint64, error) {
   154  	setDefaults(cfg)
   155  
   156  	vmenv := NewEnv(cfg)
   157  
   158  	sender := cfg.State.GetOrNewStateObject(cfg.Origin)
   159  	// Call the code with the given configuration.
   160  	ret, leftOverGas, err := vmenv.Call(
   161  		sender,
   162  		address,
   163  		input,
   164  		cfg.GasLimit,
   165  		cfg.Value,
   166  	)
   167  
   168  	return ret, leftOverGas, err
   169  }