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https://github.com/ethereum/go-ethereum.git
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76 lines
2.7 KiB
Go
76 lines
2.7 KiB
Go
// Copyright 2026 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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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/lru"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/metrics"
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)
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var (
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jumpDestHitMeter = metrics.NewRegisteredMeter("chain/cache/jumpdest/hit", nil)
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jumpDestMissMeter = metrics.NewRegisteredMeter("chain/cache/jumpdest/miss", nil)
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)
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const (
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// jumpDestBuckets is the number of independent LRU shards. Code hashes
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// are dispatched by the low bits of the first byte to spread load across
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// shards and reduce mutex contention from the parallel prefetcher.
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jumpDestBuckets = 8
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// jumpDestBucketSize is the per-shard byte budget.
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jumpDestBucketSize = 8 * 1024 * 1024
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)
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// shardedJumpDestCache is a thread-safe, byte-bounded LRU of JUMPDEST analysis
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// bitmaps, sharded into independent buckets to reduce lock contention. It is
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// owned by BlockChain and shared across block processing and prefetching,
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// keyed by the immutable contract code hash.
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type shardedJumpDestCache struct {
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buckets [jumpDestBuckets]struct {
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dest *lru.SizeConstrainedCache[common.Hash, vm.BitVec]
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}
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}
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// NewJumpDestCache constructs the analysis cache.
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func NewJumpDestCache() vm.JumpDestCache {
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c := new(shardedJumpDestCache)
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for i := range c.buckets {
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c.buckets[i].dest = lru.NewSizeConstrainedCache[common.Hash, vm.BitVec](jumpDestBucketSize)
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}
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return c
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}
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// Load retrieves the cached jumpdest analysis for the given code hash.
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func (c *shardedJumpDestCache) Load(hash common.Hash) (vm.BitVec, bool) {
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bucket := &c.buckets[hash[0]&(jumpDestBuckets-1)]
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v, ok := bucket.dest.Get(hash)
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if ok {
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jumpDestHitMeter.Mark(1)
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} else {
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jumpDestMissMeter.Mark(1)
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}
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return v, ok
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}
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// Store saves the jumpdest analysis for the given code hash.
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func (c *shardedJumpDestCache) Store(hash common.Hash, b vm.BitVec) {
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bucket := &c.buckets[hash[0]&(jumpDestBuckets-1)]
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bucket.dest.Add(hash, b)
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}
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