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279 lines
10 KiB
279 lines
10 KiB
// Copyright 2021 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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"maps"
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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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"github.com/ethereum/go-ethereum/trie/utils"
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"github.com/holiman/uint256"
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)
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// mode specifies how a tree location has been accessed
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// for the byte value:
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// * the first bit is set if the branch has been edited
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// * the second bit is set if the branch has been read
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type mode byte
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const (
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AccessWitnessReadFlag = mode(1)
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AccessWitnessWriteFlag = mode(2)
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)
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var zeroTreeIndex uint256.Int
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// AccessEvents lists the locations of the state that are being accessed
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// during the production of a block.
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type AccessEvents struct {
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branches map[branchAccessKey]mode
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chunks map[chunkAccessKey]mode
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pointCache *utils.PointCache
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}
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func NewAccessEvents(pointCache *utils.PointCache) *AccessEvents {
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return &AccessEvents{
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branches: make(map[branchAccessKey]mode),
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chunks: make(map[chunkAccessKey]mode),
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pointCache: pointCache,
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}
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}
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// Merge is used to merge the access events that were generated during the
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// execution of a tx, with the accumulation of all access events that were
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// generated during the execution of all txs preceding this one in a block.
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func (ae *AccessEvents) Merge(other *AccessEvents) {
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for k := range other.branches {
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ae.branches[k] |= other.branches[k]
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}
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for k, chunk := range other.chunks {
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ae.chunks[k] |= chunk
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}
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}
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// Keys returns, predictably, the list of keys that were touched during the
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// buildup of the access witness.
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func (ae *AccessEvents) Keys() [][]byte {
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// TODO: consider if parallelizing this is worth it, probably depending on len(ae.chunks).
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keys := make([][]byte, 0, len(ae.chunks))
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for chunk := range ae.chunks {
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basePoint := ae.pointCache.Get(chunk.addr[:])
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key := utils.GetTreeKeyWithEvaluatedAddress(basePoint, &chunk.treeIndex, chunk.leafKey)
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keys = append(keys, key)
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}
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return keys
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}
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func (ae *AccessEvents) Copy() *AccessEvents {
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cpy := &AccessEvents{
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branches: maps.Clone(ae.branches),
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chunks: maps.Clone(ae.chunks),
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pointCache: ae.pointCache,
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}
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return cpy
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}
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// AddAccount returns the gas to be charged for each of the currently cold
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// member fields of an account.
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func (ae *AccessEvents) AddAccount(addr common.Address, isWrite bool) uint64 {
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var gas uint64
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gas += ae.touchAddressAndChargeGas(addr, zeroTreeIndex, utils.BasicDataLeafKey, isWrite)
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gas += ae.touchAddressAndChargeGas(addr, zeroTreeIndex, utils.CodeHashLeafKey, isWrite)
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return gas
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}
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// MessageCallGas returns the gas to be charged for each of the currently
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// cold member fields of an account, that need to be touched when making a message
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// call to that account.
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func (ae *AccessEvents) MessageCallGas(destination common.Address) uint64 {
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var gas uint64
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gas += ae.touchAddressAndChargeGas(destination, zeroTreeIndex, utils.BasicDataLeafKey, false)
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return gas
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}
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// ValueTransferGas returns the gas to be charged for each of the currently
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// cold balance member fields of the caller and the callee accounts.
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func (ae *AccessEvents) ValueTransferGas(callerAddr, targetAddr common.Address) uint64 {
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var gas uint64
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gas += ae.touchAddressAndChargeGas(callerAddr, zeroTreeIndex, utils.BasicDataLeafKey, true)
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gas += ae.touchAddressAndChargeGas(targetAddr, zeroTreeIndex, utils.BasicDataLeafKey, true)
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return gas
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}
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// ContractCreateInitGas returns the access gas costs for the initialization of
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// a contract creation.
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func (ae *AccessEvents) ContractCreateInitGas(addr common.Address, createSendsValue bool) uint64 {
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var gas uint64
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gas += ae.touchAddressAndChargeGas(addr, zeroTreeIndex, utils.BasicDataLeafKey, true)
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return gas
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}
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// AddTxOrigin adds the member fields of the sender account to the access event list,
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// so that cold accesses are not charged, since they are covered by the 21000 gas.
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func (ae *AccessEvents) AddTxOrigin(originAddr common.Address) {
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ae.touchAddressAndChargeGas(originAddr, zeroTreeIndex, utils.BasicDataLeafKey, true)
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ae.touchAddressAndChargeGas(originAddr, zeroTreeIndex, utils.CodeHashLeafKey, false)
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}
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// AddTxDestination adds the member fields of the sender account to the access event list,
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// so that cold accesses are not charged, since they are covered by the 21000 gas.
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func (ae *AccessEvents) AddTxDestination(addr common.Address, sendsValue bool) {
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ae.touchAddressAndChargeGas(addr, zeroTreeIndex, utils.BasicDataLeafKey, sendsValue)
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ae.touchAddressAndChargeGas(addr, zeroTreeIndex, utils.CodeHashLeafKey, false)
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}
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// SlotGas returns the amount of gas to be charged for a cold storage access.
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func (ae *AccessEvents) SlotGas(addr common.Address, slot common.Hash, isWrite bool) uint64 {
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treeIndex, subIndex := utils.StorageIndex(slot.Bytes())
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return ae.touchAddressAndChargeGas(addr, *treeIndex, subIndex, isWrite)
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}
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// touchAddressAndChargeGas adds any missing access event to the access event list, and returns the cold
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// access cost to be charged, if need be.
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func (ae *AccessEvents) touchAddressAndChargeGas(addr common.Address, treeIndex uint256.Int, subIndex byte, isWrite bool) uint64 {
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stemRead, selectorRead, stemWrite, selectorWrite, selectorFill := ae.touchAddress(addr, treeIndex, subIndex, isWrite)
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var gas uint64
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if stemRead {
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gas += params.WitnessBranchReadCost
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}
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if selectorRead {
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gas += params.WitnessChunkReadCost
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}
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if stemWrite {
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gas += params.WitnessBranchWriteCost
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}
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if selectorWrite {
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gas += params.WitnessChunkWriteCost
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}
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if selectorFill {
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gas += params.WitnessChunkFillCost
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}
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return gas
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}
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// touchAddress adds any missing access event to the access event list.
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func (ae *AccessEvents) touchAddress(addr common.Address, treeIndex uint256.Int, subIndex byte, isWrite bool) (bool, bool, bool, bool, bool) {
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branchKey := newBranchAccessKey(addr, treeIndex)
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chunkKey := newChunkAccessKey(branchKey, subIndex)
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// Read access.
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var branchRead, chunkRead bool
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if _, hasStem := ae.branches[branchKey]; !hasStem {
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branchRead = true
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ae.branches[branchKey] = AccessWitnessReadFlag
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}
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if _, hasSelector := ae.chunks[chunkKey]; !hasSelector {
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chunkRead = true
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ae.chunks[chunkKey] = AccessWitnessReadFlag
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}
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// Write access.
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var branchWrite, chunkWrite, chunkFill bool
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if isWrite {
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if (ae.branches[branchKey] & AccessWitnessWriteFlag) == 0 {
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branchWrite = true
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ae.branches[branchKey] |= AccessWitnessWriteFlag
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}
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chunkValue := ae.chunks[chunkKey]
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if (chunkValue & AccessWitnessWriteFlag) == 0 {
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chunkWrite = true
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ae.chunks[chunkKey] |= AccessWitnessWriteFlag
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}
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// TODO: charge chunk filling costs if the leaf was previously empty in the state
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}
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return branchRead, chunkRead, branchWrite, chunkWrite, chunkFill
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}
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type branchAccessKey struct {
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addr common.Address
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treeIndex uint256.Int
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}
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func newBranchAccessKey(addr common.Address, treeIndex uint256.Int) branchAccessKey {
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var sk branchAccessKey
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sk.addr = addr
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sk.treeIndex = treeIndex
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return sk
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}
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type chunkAccessKey struct {
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branchAccessKey
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leafKey byte
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}
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func newChunkAccessKey(branchKey branchAccessKey, leafKey byte) chunkAccessKey {
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var lk chunkAccessKey
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lk.branchAccessKey = branchKey
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lk.leafKey = leafKey
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return lk
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}
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// CodeChunksRangeGas is a helper function to touch every chunk in a code range and charge witness gas costs
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func (ae *AccessEvents) CodeChunksRangeGas(contractAddr common.Address, startPC, size uint64, codeLen uint64, isWrite bool) uint64 {
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// note that in the case where the copied code is outside the range of the
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// contract code but touches the last leaf with contract code in it,
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// we don't include the last leaf of code in the AccessWitness. The
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// reason that we do not need the last leaf is the account's code size
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// is already in the AccessWitness so a stateless verifier can see that
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// the code from the last leaf is not needed.
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if (codeLen == 0 && size == 0) || startPC > codeLen {
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return 0
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}
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endPC := startPC + size
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if endPC > codeLen {
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endPC = codeLen
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}
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if endPC > 0 {
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endPC -= 1 // endPC is the last bytecode that will be touched.
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}
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var statelessGasCharged uint64
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for chunkNumber := startPC / 31; chunkNumber <= endPC/31; chunkNumber++ {
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treeIndex := *uint256.NewInt((chunkNumber + 128) / 256)
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subIndex := byte((chunkNumber + 128) % 256)
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gas := ae.touchAddressAndChargeGas(contractAddr, treeIndex, subIndex, isWrite)
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var overflow bool
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statelessGasCharged, overflow = math.SafeAdd(statelessGasCharged, gas)
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if overflow {
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panic("overflow when adding gas")
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}
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}
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return statelessGasCharged
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}
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// BasicDataGas adds the account's basic data to the accessed data, and returns the
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// amount of gas that it costs.
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// Note that an access in write mode implies an access in read mode, whereas an
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// access in read mode does not imply an access in write mode.
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func (ae *AccessEvents) BasicDataGas(addr common.Address, isWrite bool) uint64 {
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return ae.touchAddressAndChargeGas(addr, zeroTreeIndex, utils.BasicDataLeafKey, isWrite)
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}
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// CodeHashGas adds the account's code hash to the accessed data, and returns the
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// amount of gas that it costs.
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// in write mode. If false, the charged gas corresponds to an access in read mode.
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// Note that an access in write mode implies an access in read mode, whereas an access in
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// read mode does not imply an access in write mode.
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func (ae *AccessEvents) CodeHashGas(addr common.Address, isWrite bool) uint64 {
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return ae.touchAddressAndChargeGas(addr, zeroTreeIndex, utils.CodeHashLeafKey, isWrite)
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}
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