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74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
// Copyright 2024 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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"sync"
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"github.com/ethereum/go-ethereum/common"
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)
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// JumpDestCache represents the cache of jumpdest analysis results.
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type JumpDestCache interface {
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// Load retrieves the cached jumpdest analysis for the given code hash.
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// Returns the BitVec and true if found, or nil and false if not cached.
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Load(codeHash common.Hash) (BitVec, bool)
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// Store saves the jumpdest analysis for the given code hash.
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Store(codeHash common.Hash, vec BitVec)
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}
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// mapJumpDests is the default implementation of JumpDests using a map.
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// This implementation is not thread-safe and is meant to be used per EVM instance.
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type mapJumpDests map[common.Hash]BitVec
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// newMapJumpDests creates a new map-based JumpDests implementation.
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func newMapJumpDests() JumpDestCache {
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return make(mapJumpDests)
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}
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func (j mapJumpDests) Load(codeHash common.Hash) (BitVec, bool) {
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vec, ok := j[codeHash]
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return vec, ok
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}
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func (j mapJumpDests) Store(codeHash common.Hash, vec BitVec) {
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j[codeHash] = vec
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}
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// globalJumpDestCache is a global cache of JUMPDEST bitmaps.
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var globalJumpDestCache sync.Map
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type globalJumpDests struct{}
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// newGlobalJumpDests returns a JumpDestCache backed by the process-global
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// sync.Map. All callers share the same backing map.
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func newGlobalJumpDests() JumpDestCache {
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return globalJumpDests{}
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}
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func (globalJumpDests) Load(codeHash common.Hash) (BitVec, bool) {
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v, ok := globalJumpDestCache.Load(codeHash)
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if !ok {
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return nil, false
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}
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return v.(BitVec), true
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}
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func (globalJumpDests) Store(codeHash common.Hash, vec BitVec) {
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globalJumpDestCache.Store(codeHash, vec)
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}
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