github.com/immesys/bw2bc@v1.1.0/core/vm_env.go (about) 1 // Copyright 2014 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 core 18 19 import ( 20 "math/big" 21 22 "github.com/ethereum/go-ethereum/common" 23 "github.com/ethereum/go-ethereum/core/state" 24 "github.com/ethereum/go-ethereum/core/types" 25 "github.com/ethereum/go-ethereum/core/vm" 26 ) 27 28 type VMEnv struct { 29 state *state.StateDB 30 header *types.Header 31 msg Message 32 depth int 33 chain *ChainManager 34 typ vm.Type 35 // structured logging 36 logs []vm.StructLog 37 } 38 39 func NewEnv(state *state.StateDB, chain *ChainManager, msg Message, header *types.Header) *VMEnv { 40 return &VMEnv{ 41 chain: chain, 42 state: state, 43 header: header, 44 msg: msg, 45 typ: vm.StdVmTy, 46 } 47 } 48 49 func (self *VMEnv) Origin() common.Address { f, _ := self.msg.From(); return f } 50 func (self *VMEnv) BlockNumber() *big.Int { return self.header.Number } 51 func (self *VMEnv) Coinbase() common.Address { return self.header.Coinbase } 52 func (self *VMEnv) Time() *big.Int { return self.header.Time } 53 func (self *VMEnv) Difficulty() *big.Int { return self.header.Difficulty } 54 func (self *VMEnv) GasLimit() *big.Int { return self.header.GasLimit } 55 func (self *VMEnv) Value() *big.Int { return self.msg.Value() } 56 func (self *VMEnv) State() *state.StateDB { return self.state } 57 func (self *VMEnv) Depth() int { return self.depth } 58 func (self *VMEnv) SetDepth(i int) { self.depth = i } 59 func (self *VMEnv) VmType() vm.Type { return self.typ } 60 func (self *VMEnv) SetVmType(t vm.Type) { self.typ = t } 61 func (self *VMEnv) GetHash(n uint64) common.Hash { 62 if block := self.chain.GetBlockByNumber(n); block != nil { 63 return block.Hash() 64 } 65 66 return common.Hash{} 67 } 68 69 func (self *VMEnv) AddLog(log *state.Log) { 70 self.state.AddLog(log) 71 } 72 func (self *VMEnv) CanTransfer(from vm.Account, balance *big.Int) bool { 73 return from.Balance().Cmp(balance) >= 0 74 } 75 76 func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) error { 77 return vm.Transfer(from, to, amount) 78 } 79 80 func (self *VMEnv) Call(me vm.ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) { 81 exe := NewExecution(self, &addr, data, gas, price, value) 82 return exe.Call(addr, me) 83 } 84 func (self *VMEnv) CallCode(me vm.ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) { 85 maddr := me.Address() 86 exe := NewExecution(self, &maddr, data, gas, price, value) 87 return exe.Call(addr, me) 88 } 89 90 func (self *VMEnv) Create(me vm.ContextRef, data []byte, gas, price, value *big.Int) ([]byte, error, vm.ContextRef) { 91 exe := NewExecution(self, nil, data, gas, price, value) 92 return exe.Create(me) 93 } 94 95 func (self *VMEnv) StructLogs() []vm.StructLog { 96 return self.logs 97 } 98 99 func (self *VMEnv) AddStructLog(log vm.StructLog) { 100 self.logs = append(self.logs, log) 101 }