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https://github.com/ethereum/go-ethereum.git
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73eeee65bf
Replace 1-byte-per-bit path encoding with bit-packed `BitArray`,
reducing DB key size by 8x
Benchmark (sparse single-leaf write, M3 Pro):
```
│ Before (1B/bit) │ After (BitArray) │
│ sec/op │ sec/op vs base │
CollectNodesSparseWrite-11 10.50µ ± 1% 9.78µ ± 1% -6.86%
│ B/op │ B/op vs base │
CollectNodesSparseWrite-11 5.50Ki ± 0% 5.09Ki ± 0% -7.38%
│ allocs/op │ allocs vs base │
CollectNodesSparseWrite-11 67 ± 0% 58 ± 0% -13.43%
```
---------
Co-authored-by: Guillaume Ballet <3272758+gballet@users.noreply.github.com>
41 lines
1.4 KiB
Go
41 lines
1.4 KiB
Go
// Copyright 2025 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 bintrie
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import (
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"errors"
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"github.com/ethereum/go-ethereum/common"
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)
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func keyToPath(depth int, key []byte) ([]byte, error) {
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if depth >= 31*8 {
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return nil, errors.New("node too deep")
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}
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path := new(BitArray).SetBytes(uint8(depth+1), key)
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return path.KeyBytes(), nil
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}
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// Invariant: dirty=false implies mustRecompute=false. Every mutation that
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// invalidates the cached hash MUST also mark the blob for re-flush.
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type InternalNode struct {
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left, right nodeRef
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depth uint8
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mustRecompute bool // hash is stale (cleared by Hash)
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dirty bool // on-disk blob is stale (cleared by CollectNodes)
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hash common.Hash
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}
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