mirror of https://github.com/ethereum/go-ethereum
all: implement EIP-2929 (gas cost increases for state access opcodes) + yolo-v2 (#21509)
* core/vm, core/state: implement EIP-2929 + YOLOv2 * core/state, core/vm: fix some review concerns * core/state, core/vm: address review concerns * core/vm: address review concerns * core/vm: better documentation * core/vm: unify sload cost as fully dynamic * core/vm: fix typo * core/vm/runtime: fix compilation flaw * core/vm/runtime: fix renaming-err leftovers * core/vm: renaming * params/config: use correct yolov2 chainid for config * core, params: use a proper new genesis for yolov2 * core/state/tests: golinter nitpickspull/21745/head
Martin Holst Swende
4 years ago
committed by
GitHub
parent
fb2c79df19
commit
6487c002f6
@ -0,0 +1,136 @@ |
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// 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 state |
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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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// Copy creates an independent copy of an accessList.
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func (a *accessList) Copy() *accessList { |
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cp := newAccessList() |
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for k, v := range a.addresses { |
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cp.addresses[k] = v |
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} |
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cp.slots = make([]map[common.Hash]struct{}, len(a.slots)) |
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for i, slotMap := range a.slots { |
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newSlotmap := make(map[common.Hash]struct{}, len(slotMap)) |
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for k := range slotMap { |
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newSlotmap[k] = struct{}{} |
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} |
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cp.slots[i] = newSlotmap |
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} |
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return cp |
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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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// There are two ways this can fail
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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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@ -0,0 +1,222 @@ |
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// 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 vm |
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import ( |
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"errors" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/common/math" |
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"github.com/ethereum/go-ethereum/params" |
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) |
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const ( |
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ColdAccountAccessCostEIP2929 = uint64(2600) // COLD_ACCOUNT_ACCESS_COST
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ColdSloadCostEIP2929 = uint64(2100) // COLD_SLOAD_COST
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WarmStorageReadCostEIP2929 = uint64(100) // WARM_STORAGE_READ_COST
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) |
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// gasSStoreEIP2929 implements gas cost for SSTORE according to EIP-2929"
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//
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// When calling SSTORE, check if the (address, storage_key) pair is in accessed_storage_keys.
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// If it is not, charge an additional COLD_SLOAD_COST gas, and add the pair to accessed_storage_keys.
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// Additionally, modify the parameters defined in EIP 2200 as follows:
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//
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// Parameter Old value New value
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// SLOAD_GAS 800 = WARM_STORAGE_READ_COST
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// SSTORE_RESET_GAS 5000 5000 - COLD_SLOAD_COST
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//
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//The other parameters defined in EIP 2200 are unchanged.
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// see gasSStoreEIP2200(...) in core/vm/gas_table.go for more info about how EIP 2200 is specified
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func gasSStoreEIP2929(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { |
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// If we fail the minimum gas availability invariant, fail (0)
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if contract.Gas <= params.SstoreSentryGasEIP2200 { |
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return 0, errors.New("not enough gas for reentrancy sentry") |
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} |
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// Gas sentry honoured, do the actual gas calculation based on the stored value
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var ( |
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y, x = stack.Back(1), stack.peek() |
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slot = common.Hash(x.Bytes32()) |
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current = evm.StateDB.GetState(contract.Address(), slot) |
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cost = uint64(0) |
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) |
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// Check slot presence in the access list
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if addrPresent, slotPresent := evm.StateDB.SlotInAccessList(contract.Address(), slot); !slotPresent { |
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cost = ColdSloadCostEIP2929 |
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// If the caller cannot afford the cost, this change will be rolled back
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evm.StateDB.AddSlotToAccessList(contract.Address(), slot) |
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if !addrPresent { |
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// Once we're done with YOLOv2 and schedule this for mainnet, might
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// be good to remove this panic here, which is just really a
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// canary to have during testing
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panic("impossible case: address was not present in access list during sstore op") |
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} |
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} |
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value := common.Hash(y.Bytes32()) |
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if current == value { // noop (1)
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// EIP 2200 original clause:
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// return params.SloadGasEIP2200, nil
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return cost + WarmStorageReadCostEIP2929, nil // SLOAD_GAS
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} |
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original := evm.StateDB.GetCommittedState(contract.Address(), common.Hash(x.Bytes32())) |
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if original == current { |
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if original == (common.Hash{}) { // create slot (2.1.1)
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return cost + params.SstoreSetGasEIP2200, nil |
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} |
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if value == (common.Hash{}) { // delete slot (2.1.2b)
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evm.StateDB.AddRefund(params.SstoreClearsScheduleRefundEIP2200) |
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} |
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// EIP-2200 original clause:
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// return params.SstoreResetGasEIP2200, nil // write existing slot (2.1.2)
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return cost + (params.SstoreResetGasEIP2200 - ColdSloadCostEIP2929), nil // write existing slot (2.1.2)
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} |
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if original != (common.Hash{}) { |
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if current == (common.Hash{}) { // recreate slot (2.2.1.1)
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evm.StateDB.SubRefund(params.SstoreClearsScheduleRefundEIP2200) |
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} else if value == (common.Hash{}) { // delete slot (2.2.1.2)
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evm.StateDB.AddRefund(params.SstoreClearsScheduleRefundEIP2200) |
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} |
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} |
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if original == value { |
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if original == (common.Hash{}) { // reset to original inexistent slot (2.2.2.1)
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// EIP 2200 Original clause:
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//evm.StateDB.AddRefund(params.SstoreSetGasEIP2200 - params.SloadGasEIP2200)
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evm.StateDB.AddRefund(params.SstoreSetGasEIP2200 - WarmStorageReadCostEIP2929) |
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} else { // reset to original existing slot (2.2.2.2)
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// EIP 2200 Original clause:
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// evm.StateDB.AddRefund(params.SstoreResetGasEIP2200 - params.SloadGasEIP2200)
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// - SSTORE_RESET_GAS redefined as (5000 - COLD_SLOAD_COST)
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// - SLOAD_GAS redefined as WARM_STORAGE_READ_COST
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// Final: (5000 - COLD_SLOAD_COST) - WARM_STORAGE_READ_COST
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evm.StateDB.AddRefund((params.SstoreResetGasEIP2200 - ColdSloadCostEIP2929) - WarmStorageReadCostEIP2929) |
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} |
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} |
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// EIP-2200 original clause:
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//return params.SloadGasEIP2200, nil // dirty update (2.2)
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return cost + WarmStorageReadCostEIP2929, nil // dirty update (2.2)
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} |
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// gasSLoadEIP2929 calculates dynamic gas for SLOAD according to EIP-2929
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// For SLOAD, if the (address, storage_key) pair (where address is the address of the contract
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// whose storage is being read) is not yet in accessed_storage_keys,
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// charge 2100 gas and add the pair to accessed_storage_keys.
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// If the pair is already in accessed_storage_keys, charge 100 gas.
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func gasSLoadEIP2929(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { |
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loc := stack.peek() |
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slot := common.Hash(loc.Bytes32()) |
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// Check slot presence in the access list
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if _, slotPresent := evm.StateDB.SlotInAccessList(contract.Address(), slot); !slotPresent { |
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// If the caller cannot afford the cost, this change will be rolled back
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// If he does afford it, we can skip checking the same thing later on, during execution
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evm.StateDB.AddSlotToAccessList(contract.Address(), slot) |
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return ColdSloadCostEIP2929, nil |
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} |
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return WarmStorageReadCostEIP2929, nil |
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} |
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// gasExtCodeCopyEIP2929 implements extcodecopy according to EIP-2929
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// EIP spec:
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// > If the target is not in accessed_addresses,
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// > charge COLD_ACCOUNT_ACCESS_COST gas, and add the address to accessed_addresses.
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// > Otherwise, charge WARM_STORAGE_READ_COST gas.
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func gasExtCodeCopyEIP2929(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { |
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// memory expansion first (dynamic part of pre-2929 implementation)
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gas, err := gasExtCodeCopy(evm, contract, stack, mem, memorySize) |
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if err != nil { |
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return 0, err |
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} |
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addr := common.Address(stack.peek().Bytes20()) |
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// Check slot presence in the access list
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if !evm.StateDB.AddressInAccessList(addr) { |
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evm.StateDB.AddAddressToAccessList(addr) |
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var overflow bool |
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// We charge (cold-warm), since 'warm' is already charged as constantGas
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if gas, overflow = math.SafeAdd(gas, ColdAccountAccessCostEIP2929-WarmStorageReadCostEIP2929); overflow { |
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return 0, ErrGasUintOverflow |
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} |
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return gas, nil |
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} |
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return gas, nil |
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} |
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// gasEip2929AccountCheck checks whether the first stack item (as address) is present in the access list.
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// If it is, this method returns '0', otherwise 'cold-warm' gas, presuming that the opcode using it
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// is also using 'warm' as constant factor.
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// This method is used by:
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// - extcodehash,
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// - extcodesize,
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// - (ext) balance
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func gasEip2929AccountCheck(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { |
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addr := common.Address(stack.peek().Bytes20()) |
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// Check slot presence in the access list
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if !evm.StateDB.AddressInAccessList(addr) { |
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// If the caller cannot afford the cost, this change will be rolled back
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evm.StateDB.AddAddressToAccessList(addr) |
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// The warm storage read cost is already charged as constantGas
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return ColdAccountAccessCostEIP2929 - WarmStorageReadCostEIP2929, nil |
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} |
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return 0, nil |
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} |
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func makeCallVariantGasCallEIP2929(oldCalculator gasFunc) gasFunc { |
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return func(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { |
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addr := common.Address(stack.Back(1).Bytes20()) |
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// Check slot presence in the access list
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if !evm.StateDB.AddressInAccessList(addr) { |
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evm.StateDB.AddAddressToAccessList(addr) |
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// The WarmStorageReadCostEIP2929 (100) is already deducted in the form of a constant cost
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if !contract.UseGas(ColdAccountAccessCostEIP2929 - WarmStorageReadCostEIP2929) { |
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return 0, ErrOutOfGas |
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} |
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} |
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// Now call the old calculator, which takes into account
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// - create new account
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// - transfer value
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// - memory expansion
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// - 63/64ths rule
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return oldCalculator(evm, contract, stack, mem, memorySize) |
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} |
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} |
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var ( |
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gasCallEIP2929 = makeCallVariantGasCallEIP2929(gasCall) |
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gasDelegateCallEIP2929 = makeCallVariantGasCallEIP2929(gasDelegateCall) |
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gasStaticCallEIP2929 = makeCallVariantGasCallEIP2929(gasStaticCall) |
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gasCallCodeEIP2929 = makeCallVariantGasCallEIP2929(gasCallCode) |
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) |
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func gasSelfdestructEIP2929(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { |
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var ( |
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gas uint64 |
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address = common.Address(stack.peek().Bytes20()) |
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) |
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if !evm.StateDB.AddressInAccessList(address) { |
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// If the caller cannot afford the cost, this change will be rolled back
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evm.StateDB.AddAddressToAccessList(address) |
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gas = ColdAccountAccessCostEIP2929 |
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} |
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// if empty and transfers value
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if evm.StateDB.Empty(address) && evm.StateDB.GetBalance(contract.Address()).Sign() != 0 { |
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gas += params.CreateBySelfdestructGas |
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} |
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if !evm.StateDB.HasSuicided(contract.Address()) { |
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evm.StateDB.AddRefund(params.SelfdestructRefundGas) |
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} |
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return gas, nil |
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} |
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