cleanups
This commit is contained in:
Jacek Sieka
parent
872d7ff493
commit
7e881a4c09
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@ -295,7 +295,7 @@ proc readValue*[T](r: var SszReader, val: var T) {.raises: [Defect, MalformedSsz
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readSszValue(r.stream.read(r.stream.len.get), val)
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const
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zeroChunk = default array[32, byte]
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zero64 = default array[64, byte]
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func hash(a, b: openArray[byte]): Eth2Digest =
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result = withEth2Hash:
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@ -319,14 +319,14 @@ func mergeBranches(existing: Eth2Digest, newData: openarray[byte]): Eth2Digest =
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let paddingBytes = bytesPerChunk - newData.len
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if paddingBytes > 0:
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trs "USING ", paddingBytes, " PADDING BYTES"
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h.update zeroChunk.toOpenArray(0, paddingBytes - 1)
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h.update zero64.toOpenArray(0, paddingBytes - 1)
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trs "HASH RESULT ", result
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template mergeBranches(a, b: Eth2Digest): Eth2Digest =
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hash(a.data, b.data)
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func computeZeroHashes: array[sizeof(Limit) * 8, Eth2Digest] =
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result[0] = Eth2Digest(data: zeroChunk)
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result[0] = Eth2Digest()
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for i in 1 .. result.high:
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result[i] = mergeBranches(result[i - 1], result[i - 1])
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@ -533,11 +533,7 @@ func maxChunksCount(T: type, maxLen: int64): int64 =
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when T is BitList|BitArray:
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(maxLen + bitsPerChunk - 1) div bitsPerChunk
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elif T is array|List:
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type E = ElemType(T)
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when E is BasicType:
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(maxLen * sizeof(E) + bytesPerChunk - 1) div bytesPerChunk
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else:
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maxLen
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maxChunkIdx(ElemType(T), maxLen)
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else:
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unsupported T # This should never happen
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@ -579,8 +575,28 @@ func hashTreeRootAux[T](x: T): Eth2Digest =
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else:
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unsupported T
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func hashTreeRootList(x: List|BitList): Eth2Digest =
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const maxLen = static(x.maxLen)
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type T = type(x)
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const limit = maxChunksCount(T, maxLen)
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var merkleizer = createMerkleizer(limit)
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when x is BitList:
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merkleizer.bitListHashTreeRoot(BitSeq x)
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else:
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type E = ElemType(T)
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let contentsHash = when E is BasicType:
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chunkedHashTreeRootForBasicTypes(merkleizer, asSeq x)
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else:
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for elem in x:
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let elemHash = hash_tree_root(elem)
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merkleizer.addChunk(elemHash.data)
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merkleizer.getFinalHash()
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mixInLength(contentsHash, x.len)
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func mergedDataHash(x: HashList|HashArray, chunkIdx: int64): Eth2Digest =
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# The hash of the two cached
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# The merged hash of the data at `chunkIdx` and `chunkIdx + 1`
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trs "DATA HASH ", chunkIdx, " ", x.data.len
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when x.T is BasicType:
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@ -592,8 +608,6 @@ func mergedDataHash(x: HashList|HashArray, chunkIdx: int64): Eth2Digest =
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byteIdx = chunkIdx * bytesPerChunk
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byteLen = x.data.len * sizeof(x.T)
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const zero64 = default(array[64, byte])
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if byteIdx >= byteLen:
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zeroHashes[1]
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else:
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@ -616,8 +630,20 @@ func mergedDataHash(x: HashList|HashArray, chunkIdx: int64): Eth2Digest =
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hash_tree_root(x.data[chunkIdx]),
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hash_tree_root(x.data[chunkIdx + 1]))
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func cachedHash*(x: HashList, vIdx: int64): Eth2Digest =
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doAssert vIdx >= 1
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template mergedHash(x: HashList|HashArray, vIdxParam: int64): Eth2Digest =
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# The merged hash of the data at `vIdx` and `vIdx + 1`
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let vIdx = vIdxParam
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if vIdx >= x.maxChunks:
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let dataIdx = vIdx - x.maxChunks
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mergedDataHash(x, dataIdx)
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else:
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mergeBranches(
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hashTreeRootCached(x, vIdx),
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hashTreeRootCached(x, vIdx + 1))
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func hashTreeRootCached*(x: HashList, vIdx: int64): Eth2Digest =
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doAssert vIdx >= 1, "Only valid for flat merkle tree indices"
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let
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layer = layer(vIdx)
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@ -636,71 +662,46 @@ func cachedHash*(x: HashList, vIdx: int64): Eth2Digest =
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trs "REFRESHING ", vIdx, " ", layerIdx, " ", layer
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px[].hashes[layerIdx] =
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if layer == x.maxDepth - 1:
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let dataIdx = vIdx * 2 - 1'i64 shl (x.maxDepth)
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mergedDataHash(x, dataIdx)
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else:
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mergeBranches(
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cachedHash(x, vIdx * 2),
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cachedHash(x, vIdx * 2 + 1))
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px[].hashes[layerIdx] = mergedHash(x, vIdx * 2)
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else:
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trs "CACHED ", layerIdx
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x.hashes[layerIdx]
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func cachedHash*(x: HashArray, i: int): Eth2Digest =
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doAssert i > 0, "Only valid for flat merkle tree indices"
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func hashTreeRootCached*(x: HashArray, vIdx: int): Eth2Digest =
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doAssert vIdx >= 1, "Only valid for flat merkle tree indices"
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if not isCached(x.hashes[i]):
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if not isCached(x.hashes[vIdx]):
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# TODO oops. so much for maintaining non-mutability.
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let px = unsafeAddr x
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px[].hashes[i] =
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if i * 2 >= x.hashes.len():
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let dataIdx = i * 2 - x.hashes.len()
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mergedDataHash(x, dataIdx)
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else:
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mergeBranches(
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cachedHash(x, i * 2),
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cachedHash(x, i * 2 + 1))
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px[].hashes[vIdx] = mergedHash(x, vIdx * 2)
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return x.hashes[i]
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return x.hashes[vIdx]
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func hash_tree_root*(x: auto): Eth2Digest {.raises: [Defect], nbench.} =
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trs "STARTING HASH TREE ROOT FOR TYPE ", name(type(x))
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mixin toSszType
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func hashTreeRootCached*(x: HashArray): Eth2Digest =
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hashTreeRootCached(x, 1) # Array does not use idx 0
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result = when x is HashArray:
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cachedHash(x, 1)
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elif x is HashList:
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if x.hashes.len < 2:
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func hashTreeRootCached*(x: HashList): Eth2Digest =
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if x.data.len == 0:
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mixInLength(zeroHashes[x.maxDepth], x.data.len())
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else:
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if not isCached(x.hashes[0]):
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# TODO oops. so much for maintaining non-mutability.
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let px = unsafeAddr x
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px[].hashes[0] = mixInLength(hashTreeRootCached(x, 1), x.data.len)
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px[].hashes[0] = mixInLength(cachedHash(x, 1), x.data.len)
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x.hashes[0]
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elif x is List|BitList:
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const maxLen = static(x.maxLen)
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type T = type(x)
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const limit = maxChunksCount(T, maxLen)
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var merkleizer = createMerkleizer(limit)
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when x is BitList:
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merkleizer.bitListHashTreeRoot(BitSeq x)
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else:
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type E = ElemType(T)
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let contentsHash = when E is BasicType:
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chunkedHashTreeRootForBasicTypes(merkleizer, asSeq x)
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else:
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for elem in x:
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let elemHash = hash_tree_root(elem)
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merkleizer.addChunk(elemHash.data)
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merkleizer.getFinalHash()
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mixInLength(contentsHash, x.len)
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func hash_tree_root*(x: auto): Eth2Digest {.raises: [Defect], nbench.} =
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trs "STARTING HASH TREE ROOT FOR TYPE ", name(type(x))
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mixin toSszType
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result =
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when x is HashArray|HashList:
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hashTreeRootCached(x)
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elif x is List|BitList:
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hashTreeRootList(x)
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else:
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hashTreeRootAux toSszType(x)
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@ -8,6 +8,8 @@ import
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const
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offsetSize* = 4
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bytesPerChunk* = 32
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# A few index types from here onwards:
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# * dataIdx - leaf index starting from 0 to maximum length of collection
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@ -18,7 +20,7 @@ const
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proc dataPerChunk(T: type): int =
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# How many data items fit in a chunk
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when T is bool|SomeUnsignedInt: # BasicType
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32 div sizeof(T)
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bytesPerChunk div sizeof(T)
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else:
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1
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@ -26,7 +28,7 @@ template chunkIdx*(T: type, dataIdx: int64): int64 =
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# Given a data index, which chunk does it belong to?
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dataIdx div dataPerChunk(T)
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template maxChunkIdx(T: type, maxLen: int64): int64 =
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template maxChunkIdx*(T: type, maxLen: int64): int64 =
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# Given a number of data items, how many chunks are needed?
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chunkIdx(T, maxLen + dataPerChunk(T) - 1)
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