github.com/ethereumproject/go-ethereum@v5.5.2+incompatible/core/vm/runtime/env.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package runtime
    18  
    19  import (
    20  	"math/big"
    21  
    22  	"github.com/ethereumproject/go-ethereum/common"
    23  	"github.com/ethereumproject/go-ethereum/core"
    24  	"github.com/ethereumproject/go-ethereum/core/state"
    25  	"github.com/ethereumproject/go-ethereum/core/vm"
    26  )
    27  
    28  // Env is a basic runtime environment required for running the EVM.
    29  type Env struct {
    30  	ruleSet vm.RuleSet
    31  	depth   int
    32  	state   *state.StateDB
    33  
    34  	origin   common.Address
    35  	coinbase common.Address
    36  
    37  	number     *big.Int
    38  	time       *big.Int
    39  	difficulty *big.Int
    40  	gasLimit   *big.Int
    41  
    42  	getHashFn func(uint64) common.Hash
    43  
    44  	evm *vm.EVM
    45  }
    46  
    47  // NewEnv returns a new vm.Environment
    48  func NewEnv(cfg *Config, state *state.StateDB) vm.Environment {
    49  	env := &Env{
    50  		ruleSet:    cfg.RuleSet,
    51  		state:      state,
    52  		origin:     cfg.Origin,
    53  		coinbase:   cfg.Coinbase,
    54  		number:     cfg.BlockNumber,
    55  		time:       cfg.Time,
    56  		difficulty: cfg.Difficulty,
    57  		gasLimit:   cfg.GasLimit,
    58  	}
    59  	env.evm = vm.New(env)
    60  
    61  	return env
    62  }
    63  
    64  func (self *Env) RuleSet() vm.RuleSet      { return self.ruleSet }
    65  func (self *Env) Vm() vm.Vm                { return self.evm }
    66  func (self *Env) Origin() common.Address   { return self.origin }
    67  func (self *Env) BlockNumber() *big.Int    { return self.number }
    68  func (self *Env) Coinbase() common.Address { return self.coinbase }
    69  func (self *Env) Time() *big.Int           { return self.time }
    70  func (self *Env) Difficulty() *big.Int     { return self.difficulty }
    71  func (self *Env) Db() vm.Database          { return self.state }
    72  func (self *Env) GasLimit() *big.Int       { return self.gasLimit }
    73  func (self *Env) VmType() vm.Type          { return vm.StdVmTy }
    74  func (self *Env) GetHash(n uint64) common.Hash {
    75  	return self.getHashFn(n)
    76  }
    77  func (self *Env) AddLog(log *vm.Log) {
    78  	self.state.AddLog(*log)
    79  }
    80  func (self *Env) Depth() int     { return self.depth }
    81  func (self *Env) SetDepth(i int) { self.depth = i }
    82  func (self *Env) CanTransfer(from common.Address, balance *big.Int) bool {
    83  	return self.state.GetBalance(from).Cmp(balance) >= 0
    84  }
    85  func (self *Env) SnapshotDatabase() int {
    86  	return self.state.Snapshot()
    87  }
    88  func (self *Env) RevertToSnapshot(snapshot int) {
    89  	self.state.RevertToSnapshot(snapshot)
    90  }
    91  
    92  func (self *Env) Transfer(from, to vm.Account, amount *big.Int) {
    93  	core.Transfer(from, to, amount)
    94  }
    95  
    96  func (self *Env) Call(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
    97  	return core.Call(self, caller, addr, data, gas, price, value)
    98  }
    99  func (self *Env) CallCode(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
   100  	return core.CallCode(self, caller, addr, data, gas, price, value)
   101  }
   102  
   103  func (self *Env) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error) {
   104  	return core.DelegateCall(self, me, addr, data, gas, price)
   105  }
   106  
   107  func (self *Env) Create(caller vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error) {
   108  	return core.Create(self, caller, data, gas, price, value)
   109  }