forked from cerc-io/laconicd-deprecated
119 lines
4.0 KiB
Go
119 lines
4.0 KiB
Go
// Copyright 2020 The go-ethereum Authors
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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 statedb
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import (
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"github.com/ethereum/go-ethereum/common"
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)
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type accessList struct {
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addresses map[common.Address]int
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slots []map[common.Hash]struct{}
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}
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// ContainsAddress returns true if the address is in the access list.
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func (al *accessList) ContainsAddress(address common.Address) bool {
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_, ok := al.addresses[address]
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return ok
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}
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// Contains checks if a slot within an account is present in the access list, returning
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// separate flags for the presence of the account and the slot respectively.
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func (al *accessList) Contains(address common.Address, slot common.Hash) (addressPresent bool, slotPresent bool) {
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idx, ok := al.addresses[address]
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if !ok {
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// no such address (and hence zero slots)
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return false, false
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}
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if idx == -1 {
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// address yes, but no slots
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return true, false
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}
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_, slotPresent = al.slots[idx][slot]
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return true, slotPresent
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}
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// newAccessList creates a new accessList.
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func newAccessList() *accessList {
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return &accessList{
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addresses: make(map[common.Address]int),
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}
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}
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// AddAddress adds an address to the access list, and returns 'true' if the operation
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// caused a change (addr was not previously in the list).
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func (al *accessList) AddAddress(address common.Address) bool {
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if _, present := al.addresses[address]; present {
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return false
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}
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al.addresses[address] = -1
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return true
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}
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// AddSlot adds the specified (addr, slot) combo to the access list.
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// Return values are:
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// - address added
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// - slot added
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// For any 'true' value returned, a corresponding journal entry must be made.
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func (al *accessList) AddSlot(address common.Address, slot common.Hash) (addrChange bool, slotChange bool) {
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idx, addrPresent := al.addresses[address]
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if !addrPresent || idx == -1 {
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// Address not present, or addr present but no slots there
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al.addresses[address] = len(al.slots)
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slotmap := map[common.Hash]struct{}{slot: {}}
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al.slots = append(al.slots, slotmap)
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return !addrPresent, true
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}
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// There is already an (address,slot) mapping
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slotmap := al.slots[idx]
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if _, ok := slotmap[slot]; !ok {
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slotmap[slot] = struct{}{}
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// Journal add slot change
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return false, true
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}
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// No changes required
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return false, false
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}
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// DeleteSlot removes an (address, slot)-tuple from the access list.
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// This operation needs to be performed in the same order as the addition happened.
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// This method is meant to be used by the journal, which maintains ordering of
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// operations.
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func (al *accessList) DeleteSlot(address common.Address, slot common.Hash) {
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idx, addrOk := al.addresses[address]
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if !addrOk {
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panic("reverting slot change, address not present in list")
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}
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slotmap := al.slots[idx]
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delete(slotmap, slot)
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// If that was the last (first) slot, remove it
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// Since additions and rollbacks are always performed in order,
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// we can delete the item without worrying about screwing up later indices
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if len(slotmap) == 0 {
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al.slots = al.slots[:idx]
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al.addresses[address] = -1
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}
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}
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// DeleteAddress removes an address from the access list. This operation
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// needs to be performed in the same order as the addition happened.
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// This method is meant to be used by the journal, which maintains ordering of
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// operations.
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func (al *accessList) DeleteAddress(address common.Address) {
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delete(al.addresses, address)
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}
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