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| 1 | +// Copyright 2016 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 state |
| 18 | + |
| 19 | +import ( |
| 20 | + "math/big" |
| 21 | + |
| 22 | + "github.com/ethereum/go-ethereum/common" |
| 23 | +) |
| 24 | + |
| 25 | +type journalEntry interface { |
| 26 | + undo(*StateDB) |
| 27 | +} |
| 28 | + |
| 29 | +type journal []journalEntry |
| 30 | + |
| 31 | +type ( |
| 32 | + // Changes to the account trie. |
| 33 | + createObjectChange struct { |
| 34 | + account *common.Address |
| 35 | + } |
| 36 | + resetObjectChange struct { |
| 37 | + prev *StateObject |
| 38 | + } |
| 39 | + suicideChange struct { |
| 40 | + account *common.Address |
| 41 | + prev bool // whether account had already suicided |
| 42 | + prevbalance *big.Int |
| 43 | + } |
| 44 | + |
| 45 | + // Changes to individual accounts. |
| 46 | + balanceChange struct { |
| 47 | + account *common.Address |
| 48 | + prev *big.Int |
| 49 | + } |
| 50 | + nonceChange struct { |
| 51 | + account *common.Address |
| 52 | + prev uint64 |
| 53 | + } |
| 54 | + storageChange struct { |
| 55 | + account *common.Address |
| 56 | + key, prevalue common.Hash |
| 57 | + } |
| 58 | + codeChange struct { |
| 59 | + account *common.Address |
| 60 | + prevcode, prevhash []byte |
| 61 | + } |
| 62 | + |
| 63 | + // Changes to other state values. |
| 64 | + refundChange struct { |
| 65 | + prev *big.Int |
| 66 | + } |
| 67 | + addLogChange struct { |
| 68 | + txhash common.Hash |
| 69 | + } |
| 70 | +) |
| 71 | + |
| 72 | +func (ch createObjectChange) undo(s *StateDB) { |
| 73 | + s.GetStateObject(*ch.account).deleted = true |
| 74 | + delete(s.stateObjects, *ch.account) |
| 75 | + delete(s.stateObjectsDirty, *ch.account) |
| 76 | +} |
| 77 | + |
| 78 | +func (ch resetObjectChange) undo(s *StateDB) { |
| 79 | + s.setStateObject(ch.prev) |
| 80 | +} |
| 81 | + |
| 82 | +func (ch suicideChange) undo(s *StateDB) { |
| 83 | + obj := s.GetStateObject(*ch.account) |
| 84 | + if obj != nil { |
| 85 | + obj.suicided = ch.prev |
| 86 | + obj.setBalance(ch.prevbalance) |
| 87 | + } |
| 88 | +} |
| 89 | + |
| 90 | +func (ch balanceChange) undo(s *StateDB) { |
| 91 | + s.GetStateObject(*ch.account).setBalance(ch.prev) |
| 92 | +} |
| 93 | + |
| 94 | +func (ch nonceChange) undo(s *StateDB) { |
| 95 | + s.GetStateObject(*ch.account).setNonce(ch.prev) |
| 96 | +} |
| 97 | + |
| 98 | +func (ch codeChange) undo(s *StateDB) { |
| 99 | + s.GetStateObject(*ch.account).setCode(common.BytesToHash(ch.prevhash), ch.prevcode) |
| 100 | +} |
| 101 | + |
| 102 | +func (ch storageChange) undo(s *StateDB) { |
| 103 | + s.GetStateObject(*ch.account).setState(ch.key, ch.prevalue) |
| 104 | +} |
| 105 | + |
| 106 | +func (ch refundChange) undo(s *StateDB) { |
| 107 | + s.refund = ch.prev |
| 108 | +} |
| 109 | + |
| 110 | +func (ch addLogChange) undo(s *StateDB) { |
| 111 | + logs := s.logs[ch.txhash] |
| 112 | + if len(logs) == 1 { |
| 113 | + delete(s.logs, ch.txhash) |
| 114 | + } else { |
| 115 | + s.logs[ch.txhash] = logs[:len(logs)-1] |
| 116 | + } |
| 117 | +} |
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