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chore: add hashtriemap implementation
This PR adds a hashtriemap implementation to the project. This is mostly a direct copy from unique package [^1] internals [^2] with some adjustments to make it work with our project. Once `maphash.Comparable` lands we can remove dependency on Go internals [^3]. Michael Knyszek says he plans to use this implementation as a general idea for the future generic sync/v2.Map, but nothing is in stone yet. [^1]: golang/go#62483 [^2]: https://go-review.googlesource.com/c/go/+/573956 [^3]: golang/go#54670 Signed-off-by: Dmitriy Matrenichev <dmitry.matrenichev@siderolabs.com>
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,74 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| // Copyright 2024 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
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| //go:build go1.22 && !go1.24 && !nomaptypehash | ||
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| //nolint:revive,govet,stylecheck,nlreturn,wsl | ||
| package concurrent | ||
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| import ( | ||
| "math/rand/v2" | ||
| "unsafe" | ||
| ) | ||
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| // NewHashTrieMap creates a new HashTrieMap for the provided key and value. | ||
| func NewHashTrieMap[K, V comparable]() *HashTrieMap[K, V] { | ||
| var m map[K]V | ||
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| mapType := efaceMapOf(m) | ||
| ht := &HashTrieMap[K, V]{ | ||
| root: newIndirectNode[K, V](nil), | ||
| keyHash: mapType._type.Hasher, | ||
| seed: uintptr(rand.Uint64()), | ||
| } | ||
| return ht | ||
| } | ||
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| // _MapType is runtime.maptype from runtime/type.go. | ||
| type _MapType struct { | ||
| _Type | ||
| Key *_Type | ||
| Elem *_Type | ||
| Bucket *_Type // internal type representing a hash bucket | ||
| // function for hashing keys (ptr to key, seed) -> hash | ||
| Hasher func(unsafe.Pointer, uintptr) uintptr | ||
| KeySize uint8 // size of key slot | ||
| ValueSize uint8 // size of elem slot | ||
| BucketSize uint16 // size of bucket | ||
| Flags uint32 | ||
| } | ||
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| // _Type is runtime._type from runtime/type.go. | ||
| type _Type struct { | ||
| Size_ uintptr | ||
| PtrBytes uintptr // number of (prefix) bytes in the type that can contain pointers | ||
| Hash uint32 // hash of type; avoids computation in hash tables | ||
| TFlag uint8 // extra type information flags | ||
| Align_ uint8 // alignment of variable with this type | ||
| FieldAlign_ uint8 // alignment of struct field with this type | ||
| Kind_ uint8 // enumeration for C | ||
| // function for comparing objects of this type | ||
| // (ptr to object A, ptr to object B) -> ==? | ||
| Equal func(unsafe.Pointer, unsafe.Pointer) bool | ||
| // GCData stores the GC type data for the garbage collector. | ||
| // If the KindGCProg bit is set in kind, GCData is a GC program. | ||
| // Otherwise it is a ptrmask bitmap. See mbitmap.go for details. | ||
| GCData *byte | ||
| Str int32 // string form | ||
| PtrToThis int32 // type for pointer to this type, may be zero | ||
| } | ||
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| // efaceMap is runtime.eface from runtime/runtime2.go. | ||
| type efaceMap struct { | ||
| _type *_MapType | ||
| data unsafe.Pointer | ||
| } | ||
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| func efaceMapOf(ep any) *efaceMap { | ||
| return (*efaceMap)(unsafe.Pointer(&ep)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| // Copyright 2024 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
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| //go:build go1.22 && !go1.24 && !nomaptypehash | ||
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| //nolint:wsl,testpackage | ||
| package concurrent | ||
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| import ( | ||
| "testing" | ||
| ) | ||
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| func BenchmarkHashTrieMapLoadSmall(b *testing.B) { | ||
| benchmarkHashTrieMapLoad(b, testDataSmall[:]) | ||
| } | ||
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| func BenchmarkHashTrieMapLoad(b *testing.B) { | ||
| benchmarkHashTrieMapLoad(b, testData[:]) | ||
| } | ||
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| func BenchmarkHashTrieMapLoadLarge(b *testing.B) { | ||
| benchmarkHashTrieMapLoad(b, testDataLarge[:]) | ||
| } | ||
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| func benchmarkHashTrieMapLoad(b *testing.B, data []string) { | ||
| b.ReportAllocs() | ||
| m := NewHashTrieMap[string, int]() | ||
| for i := range data { | ||
| m.LoadOrStore(data[i], i) | ||
| } | ||
| b.ResetTimer() | ||
| b.RunParallel(func(pb *testing.PB) { | ||
| i := 0 | ||
| for pb.Next() { | ||
| _, _ = m.Load(data[i]) | ||
| i++ | ||
| if i >= len(data) { | ||
| i = 0 | ||
| } | ||
| } | ||
| }) | ||
| } | ||
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| func BenchmarkHashTrieMapLoadOrStore(b *testing.B) { | ||
| benchmarkHashTrieMapLoadOrStore(b, testData[:]) | ||
| } | ||
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| func BenchmarkHashTrieMapLoadOrStoreLarge(b *testing.B) { | ||
| benchmarkHashTrieMapLoadOrStore(b, testDataLarge[:]) | ||
| } | ||
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| func benchmarkHashTrieMapLoadOrStore(b *testing.B, data []string) { | ||
| b.ReportAllocs() | ||
| m := NewHashTrieMap[string, int]() | ||
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| b.RunParallel(func(pb *testing.PB) { | ||
| i := 0 | ||
| for pb.Next() { | ||
| _, _ = m.LoadOrStore(data[i], i) | ||
| i++ | ||
| if i >= len(data) { | ||
| i = 0 | ||
| } | ||
| } | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
|
||
| // Copyright 2024 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| //go:build go1.22 && !go1.24 && !nomaptypehash | ||
|
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| //nolint:nlreturn,wsl,testpackage | ||
| package concurrent | ||
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| import ( | ||
| "testing" | ||
| "unsafe" | ||
| ) | ||
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| func TestHashTrieMap(t *testing.T) { | ||
| testHashTrieMap(t, func() *HashTrieMap[string, int] { | ||
| return NewHashTrieMap[string, int]() | ||
| }) | ||
| } | ||
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| func TestHashTrieMapBadHash(t *testing.T) { | ||
| testHashTrieMap(t, func() *HashTrieMap[string, int] { | ||
| // Stub out the good hash function with a terrible one. | ||
| // Everything should still work as expected. | ||
| m := NewHashTrieMap[string, int]() | ||
| m.keyHash = func(_ unsafe.Pointer, _ uintptr) uintptr { | ||
| return 0 | ||
| } | ||
| return m | ||
| }) | ||
| } |
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