forked from forks/go-ethereum
e3d61e6db0
This pull request refactors the EVM constructor by removing the TxContext parameter. The EVM object is frequently overused. Ideally, only a single EVM instance should be created and reused throughout the entire state transition of a block, with the transaction context switched as needed by calling evm.SetTxContext. Unfortunately, in some parts of the code, the EVM object is repeatedly created, resulting in unnecessary complexity. This pull request is the first step towards gradually improving and simplifying this setup. --------- Co-authored-by: Martin Holst Swende <martin@swende.se>
91 lines
3.6 KiB
Go
91 lines
3.6 KiB
Go
// Copyright 2019 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 core
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import (
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"sync/atomic"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/params"
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)
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// statePrefetcher is a basic Prefetcher, which blindly executes a block on top
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// of an arbitrary state with the goal of prefetching potentially useful state
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// data from disk before the main block processor start executing.
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type statePrefetcher struct {
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config *params.ChainConfig // Chain configuration options
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chain *HeaderChain // Canonical block chain
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}
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// newStatePrefetcher initialises a new statePrefetcher.
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func newStatePrefetcher(config *params.ChainConfig, chain *HeaderChain) *statePrefetcher {
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return &statePrefetcher{
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config: config,
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chain: chain,
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}
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}
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// Prefetch processes the state changes according to the Ethereum rules by running
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// the transaction messages using the statedb, but any changes are discarded. The
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// only goal is to pre-cache transaction signatures and state trie nodes.
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func (p *statePrefetcher) Prefetch(block *types.Block, statedb *state.StateDB, cfg vm.Config, interrupt *atomic.Bool) {
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var (
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header = block.Header()
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gaspool = new(GasPool).AddGas(block.GasLimit())
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blockContext = NewEVMBlockContext(header, p.chain, nil)
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evm = vm.NewEVM(blockContext, statedb, p.config, cfg)
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signer = types.MakeSigner(p.config, header.Number, header.Time)
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)
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// Iterate over and process the individual transactions
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byzantium := p.config.IsByzantium(block.Number())
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for i, tx := range block.Transactions() {
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// If block precaching was interrupted, abort
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if interrupt != nil && interrupt.Load() {
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return
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}
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// Convert the transaction into an executable message and pre-cache its sender
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msg, err := TransactionToMessage(tx, signer, header.BaseFee)
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if err != nil {
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return // Also invalid block, bail out
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}
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statedb.SetTxContext(tx.Hash(), i)
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if err := precacheTransaction(msg, gaspool, evm); err != nil {
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return // Ugh, something went horribly wrong, bail out
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}
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// If we're pre-byzantium, pre-load trie nodes for the intermediate root
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if !byzantium {
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statedb.IntermediateRoot(true)
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}
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}
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// If were post-byzantium, pre-load trie nodes for the final root hash
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if byzantium {
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statedb.IntermediateRoot(true)
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}
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}
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// precacheTransaction attempts to apply a transaction to the given state database
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// and uses the input parameters for its environment. The goal is not to execute
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// the transaction successfully, rather to warm up touched data slots.
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func precacheTransaction(msg *Message, gaspool *GasPool, evm *vm.EVM) error {
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// Update the evm with the new transaction context.
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evm.SetTxContext(NewEVMTxContext(msg))
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// Add addresses to access list if applicable
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_, err := ApplyMessage(evm, msg, gaspool)
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return err
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}
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