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updates go-mutexes to no longer rely on unsafe linkname (#3027)

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kim 2024-06-21 16:35:32 +00:00 committed by GitHub
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19 changed files with 134 additions and 1242 deletions
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4
go.mod
View file

@ -17,7 +17,7 @@ require (
codeberg.org/gruf/go-list v0.0.0-20240425093752-494db03d641f
codeberg.org/gruf/go-logger/v2 v2.2.1
codeberg.org/gruf/go-mempool v0.0.0-20240507125005-cef10d64a760
codeberg.org/gruf/go-mutexes v1.5.0
codeberg.org/gruf/go-mutexes v1.5.1
codeberg.org/gruf/go-runners v1.6.2
codeberg.org/gruf/go-sched v1.2.3
codeberg.org/gruf/go-storage v0.1.1
@ -107,8 +107,6 @@ require (
github.com/coreos/go-systemd/v22 v22.3.2 // indirect
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
github.com/docker/go-units v0.5.0 // indirect
github.com/dolthub/maphash v0.1.0 // indirect
github.com/dolthub/swiss v0.2.1 // indirect
github.com/dsoprea/go-exif/v3 v3.0.0-20210625224831-a6301f85c82b // indirect
github.com/dsoprea/go-iptc v0.0.0-20200610044640-bc9ca208b413 // indirect
github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd // indirect

8
go.sum
View file

@ -68,8 +68,8 @@ codeberg.org/gruf/go-maps v1.0.3 h1:VDwhnnaVNUIy5O93CvkcE2IZXnMB1+IJjzfop9V12es=
codeberg.org/gruf/go-maps v1.0.3/go.mod h1:D5LNDxlC9rsDuVQVM6JObaVGAdHB6g2dTdOdkh1aXWA=
codeberg.org/gruf/go-mempool v0.0.0-20240507125005-cef10d64a760 h1:m2/UCRXhjDwAg4vyji6iKCpomKw6P4PmBOUi5DvAMH4=
codeberg.org/gruf/go-mempool v0.0.0-20240507125005-cef10d64a760/go.mod h1:E3RcaCFNq4zXpvaJb8lfpPqdUAmSkP5F1VmMiEUYTEk=
codeberg.org/gruf/go-mutexes v1.5.0 h1:kDegqA/FYQhcn294zUJ3U3VBegfvhtcI7ObcAku1zkw=
codeberg.org/gruf/go-mutexes v1.5.0/go.mod h1:rPEqQ/y6CmGITaZ3GPTMQVsoZAOzbsAHyIaLsJcOqVE=
codeberg.org/gruf/go-mutexes v1.5.1 h1:xICU0WXhWr6wf+Iror4eE3xT+xnXNPrO6o77D/G6QuY=
codeberg.org/gruf/go-mutexes v1.5.1/go.mod h1:rPEqQ/y6CmGITaZ3GPTMQVsoZAOzbsAHyIaLsJcOqVE=
codeberg.org/gruf/go-runners v1.6.2 h1:oQef9niahfHu/wch14xNxlRMP8i+ABXH1Cb9PzZ4oYo=
codeberg.org/gruf/go-runners v1.6.2/go.mod h1:Tq5PrZ/m/rBXbLZz0u5if+yP3nG5Sf6S8O/GnyEePeQ=
codeberg.org/gruf/go-sched v1.2.3 h1:H5ViDxxzOBR3uIyGBCf0eH8b1L8wMybOXcdtUUTXZHk=
@ -148,10 +148,6 @@ github.com/disintegration/imaging v1.6.2 h1:w1LecBlG2Lnp8B3jk5zSuNqd7b4DXhcjwek1
github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4=
github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
github.com/dolthub/maphash v0.1.0 h1:bsQ7JsF4FkkWyrP3oCnFJgrCUAFbFf3kOl4L/QxPDyQ=
github.com/dolthub/maphash v0.1.0/go.mod h1:gkg4Ch4CdCDu5h6PMriVLawB7koZ+5ijb9puGMV50a4=
github.com/dolthub/swiss v0.2.1 h1:gs2osYs5SJkAaH5/ggVJqXQxRXtWshF6uE0lgR/Y3Gw=
github.com/dolthub/swiss v0.2.1/go.mod h1:8AhKZZ1HK7g18j7v7k6c5cYIGEZJcPn0ARsai8cUrh0=
github.com/dsoprea/go-exif/v2 v2.0.0-20200321225314-640175a69fe4/go.mod h1:Lm2lMM2zx8p4a34ZemkaUV95AnMl4ZvLbCUbwOvLC2E=
github.com/dsoprea/go-exif/v3 v3.0.0-20200717053412-08f1b6708903/go.mod h1:0nsO1ce0mh5czxGeLo4+OCZ/C6Eo6ZlMWsz7rH/Gxv8=
github.com/dsoprea/go-exif/v3 v3.0.0-20210428042052-dca55bf8ca15/go.mod h1:cg5SNYKHMmzxsr9X6ZeLh/nfBRHHp5PngtEPcujONtk=

86
vendor/codeberg.org/gruf/go-mutexes/cond.go generated vendored
View file

@ -2,86 +2,66 @@ package mutexes
import (
"sync"
"unsafe"
)
// Cond is similar to a sync.Cond{}, but
// it encompasses the Mutex{} within itself.
type Cond struct {
notify notifyList
c sync.Cond
sync.Mutex
}
// See: sync.Cond{}.Wait().
func (c *Cond) Wait() {
t := runtime_notifyListAdd(&c.notify)
c.Mutex.Unlock()
runtime_notifyListWait(&c.notify, t)
c.Mutex.Lock()
if c.c.L == nil {
c.c.L = &c.Mutex
}
c.c.Wait()
}
// See: sync.Cond{}.Signal().
func (c *Cond) Signal() { runtime_notifyListNotifyOne(&c.notify) }
func (c *Cond) Signal() {
if c.c.L == nil {
c.c.L = &c.Mutex
}
c.c.Signal()
}
// See: sync.Cond{}.Broadcast().
func (c *Cond) Broadcast() { runtime_notifyListNotifyAll(&c.notify) }
func (c *Cond) Broadcast() {
if c.c.L == nil {
c.c.L = &c.Mutex
}
c.c.Broadcast()
}
// RWCond is similar to a sync.Cond{}, but
// it encompasses the RWMutex{} within itself.
type RWCond struct {
notify notifyList
c sync.Cond
sync.RWMutex
}
// See: sync.Cond{}.Wait().
func (c *RWCond) Wait() {
t := runtime_notifyListAdd(&c.notify)
c.RWMutex.Unlock()
runtime_notifyListWait(&c.notify, t)
c.RWMutex.Lock()
if c.c.L == nil {
c.c.L = &c.RWMutex
}
c.c.Wait()
}
// See: sync.Cond{}.Signal().
func (c *RWCond) Signal() { runtime_notifyListNotifyOne(&c.notify) }
func (c *RWCond) Signal() {
if c.c.L == nil {
c.c.L = &c.RWMutex
}
c.c.Signal()
}
// See: sync.Cond{}.Broadcast().
func (c *RWCond) Broadcast() { runtime_notifyListNotifyAll(&c.notify) }
// unused fields left
// un-named for safety.
type notifyList struct {
_ uint32 // wait uint32
notify uint32 // notify uint32
_ uintptr // lock mutex
_ unsafe.Pointer // head *sudog
_ unsafe.Pointer // tail *sudog
}
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListAdd sync.runtime_notifyListAdd
func runtime_notifyListAdd(l *notifyList) uint32
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListWait sync.runtime_notifyListWait
func runtime_notifyListWait(l *notifyList, t uint32)
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListNotifyOne sync.runtime_notifyListNotifyOne
func runtime_notifyListNotifyOne(l *notifyList)
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListNotifyAll sync.runtime_notifyListNotifyAll
func runtime_notifyListNotifyAll(l *notifyList)
// Ensure that sync and runtime agree on size of notifyList.
//
//go:linkname runtime_notifyListCheck sync.runtime_notifyListCheck
func runtime_notifyListCheck(size uintptr)
func init() {
var n notifyList
runtime_notifyListCheck(unsafe.Sizeof(n))
func (c *RWCond) Broadcast() {
if c.c.L == nil {
c.c.L = &c.RWMutex
}
c.c.Broadcast()
}

56
vendor/codeberg.org/gruf/go-mutexes/hash_map.go generated vendored Normal file
View file

@ -0,0 +1,56 @@
package mutexes
type hashmap struct {
m map[string]*rwmutex
n int
}
func (m *hashmap) init(cap int) {
m.m = make(map[string]*rwmutex, cap)
m.n = cap
}
func (m *hashmap) Get(key string) *rwmutex { return m.m[key] }
func (m *hashmap) Put(key string, mu *rwmutex) {
m.m[key] = mu
if n := len(m.m); n > m.n {
m.n = n
}
}
func (m *hashmap) Delete(key string) {
delete(m.m, key)
}
func (m *hashmap) Compact() {
// Noop when hashmap size
// is too small to matter.
if m.n < 2048 {
return
}
// Difference between maximum map
// size and the current map size.
diff := m.n - len(m.m)
// Maximum load factor before
// runtime allocates new hmap:
// maxLoad = 13 / 16
//
// So we apply the inverse/2, once
// $maxLoad/2 % of hmap is empty we
// compact the map to drop buckets.
if 2*16*diff > m.n*13 {
// Create new map only as big as required.
m2 := make(map[string]*rwmutex, len(m.m))
for k, v := range m.m {
m2[k] = v
}
// Set new.
m.m = m2
m.n = len(m2)
}
}

92
vendor/codeberg.org/gruf/go-mutexes/map.go generated vendored
View file

@ -6,7 +6,6 @@ import (
"unsafe"
"codeberg.org/gruf/go-mempool"
"github.com/dolthub/swiss"
)
const (
@ -27,14 +26,14 @@ const (
// like structures for sleeping / awaking awaiting goroutines.
type MutexMap struct {
mapmu sync.Mutex
mumap *swiss.Map[string, *rwmutex]
mumap hashmap
mupool mempool.UnsafePool
}
// checkInit ensures MutexMap is initialized (UNSAFE).
func (mm *MutexMap) checkInit() {
if mm.mumap == nil {
mm.mumap = swiss.NewMap[string, *rwmutex](0)
if mm.mumap.m == nil {
mm.mumap.init(0)
mm.mupool.DirtyFactor = 256
}
}
@ -58,7 +57,7 @@ func (mm *MutexMap) lock(key string, lt uint8) func() {
for {
// Check map for mutex.
mu, _ := mm.mumap.Get(key)
mu := mm.mumap.Get(key)
if mu == nil {
// Allocate mutex.
@ -69,7 +68,7 @@ func (mm *MutexMap) lock(key string, lt uint8) func() {
if !mu.Lock(lt) {
// Wait on mutex unlock, after
// immediately relocking map mu.
mu.WaitRelock(&mm.mapmu)
mu.WaitRelock()
continue
}
@ -100,27 +99,9 @@ func (mm *MutexMap) unlock(key string, mu *rwmutex) {
mm.mumap.Delete(key)
mm.release(mu)
// Maximum load factor before
// 'swiss' allocates new hmap:
// maxLoad = 7 / 8
//
// So we apply the inverse/2, once
// $maxLoad/2 % of hmap is empty we
// compact the map to drop buckets.
len := mm.mumap.Count()
cap := mm.mumap.Capacity()
if cap-len > (cap*7)/(8*2) {
// Create a new map only as big as required.
mumap := swiss.NewMap[string, *rwmutex](uint32(len))
mm.mumap.Iter(func(k string, v *rwmutex) (stop bool) {
mumap.Put(k, v)
return false
})
// Set new map.
mm.mumap = mumap
}
// Check if compaction
// needed.
mm.mumap.Compact()
// Done with map.
mm.mapmu.Unlock()
@ -131,7 +112,9 @@ func (mm *MutexMap) acquire() *rwmutex {
if ptr := mm.mupool.Get(); ptr != nil {
return (*rwmutex)(ptr)
}
return new(rwmutex)
mu := new(rwmutex)
mu.c.L = &mm.mapmu
return mu
}
// release will release given mutex to memory pool.
@ -152,9 +135,9 @@ func (mm *MutexMap) release(mu *rwmutex) {
// mechanism we use, otherwise all Cond{}.L would reference
// the same outer map mutex.
type rwmutex struct {
n notifyList // 'trigger' mechanism
l int32 // no. locks
t uint8 // lock type
c sync.Cond // 'trigger' mechanism
l int32 // no. locks
t uint8 // lock type
}
// Lock will lock the mutex for given lock type, in the
@ -202,11 +185,34 @@ func (mu *rwmutex) Unlock() bool {
// Fully unlocked.
mu.t = 0
// NOTE: must remain in
// sync with runtime.notifyList{}.
//
// goexperiment.staticlockranking
// does change it slightly, but
// this does not alter the first
// 2 fields which are all we need.
type notifyList struct {
_ uint32
notify uint32
// ... other fields
}
// NOTE: must remain in
// sync with sync.Cond{}.
type syncCond struct {
_ struct{}
L sync.Locker
n notifyList
// ... other fields
}
// Awake all blocked goroutines and check
// for change in the last notified ticket.
before := atomic.LoadUint32(&mu.n.notify)
runtime_notifyListNotifyAll(&mu.n)
after := atomic.LoadUint32(&mu.n.notify)
cptr := (*syncCond)(unsafe.Pointer(&mu.c))
before := atomic.LoadUint32(&cptr.n.notify)
mu.c.Broadcast() // awakes all blocked!
after := atomic.LoadUint32(&cptr.n.notify)
// If ticket changed, this indicates
// AT LEAST one goroutine was awoken.
@ -226,20 +232,4 @@ func (mu *rwmutex) Unlock() bool {
// locked state. It incr the notifyList waiter count before
// unlocking the outer mutex and blocking on notifyList wait.
// On awake it will decr wait count and relock outer mutex.
func (mu *rwmutex) WaitRelock(outer *sync.Mutex) {
// add ourselves to list while still
// under protection of outer map lock.
t := runtime_notifyListAdd(&mu.n)
// Finished with
// outer map lock.
outer.Unlock()
// Block until awoken by another
// goroutine within mu.Unlock().
runtime_notifyListWait(&mu.n, t)
// Relock!
outer.Lock()
}
func (mu *rwmutex) WaitRelock() { mu.c.Wait() }

2
vendor/github.com/dolthub/maphash/.gitignore generated vendored
View file

@ -1,2 +0,0 @@
*.idea
*.test

201
vendor/github.com/dolthub/maphash/LICENSE generated vendored
View file

@ -1,201 +0,0 @@
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4
vendor/github.com/dolthub/maphash/README.md generated vendored
View file

@ -1,4 +0,0 @@
# maphash
Hash any `comparable` type using Golang's fast runtime hash.
Uses [AES](https://en.wikipedia.org/wiki/AES_instruction_set) instructions when available.

48
vendor/github.com/dolthub/maphash/hasher.go generated vendored
View file

@ -1,48 +0,0 @@
// Copyright 2022 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package maphash
import "unsafe"
// Hasher hashes values of type K.
// Uses runtime AES-based hashing.
type Hasher[K comparable] struct {
hash hashfn
seed uintptr
}
// NewHasher creates a new Hasher[K] with a random seed.
func NewHasher[K comparable]() Hasher[K] {
return Hasher[K]{
hash: getRuntimeHasher[K](),
seed: newHashSeed(),
}
}
// NewSeed returns a copy of |h| with a new hash seed.
func NewSeed[K comparable](h Hasher[K]) Hasher[K] {
return Hasher[K]{
hash: h.hash,
seed: newHashSeed(),
}
}
// Hash hashes |key|.
func (h Hasher[K]) Hash(key K) uint64 {
// promise to the compiler that pointer
// |p| does not escape the stack.
p := noescape(unsafe.Pointer(&key))
return uint64(h.hash(p, h.seed))
}

111
vendor/github.com/dolthub/maphash/runtime.go generated vendored
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@ -1,111 +0,0 @@
// Copyright 2022 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file incorporates work covered by the following copyright and
// permission notice:
//
// Copyright 2022 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 go1.18 || go1.19
// +build go1.18 go1.19
package maphash
import (
"math/rand"
"unsafe"
)
type hashfn func(unsafe.Pointer, uintptr) uintptr
func getRuntimeHasher[K comparable]() (h hashfn) {
a := any(make(map[K]struct{}))
i := (*mapiface)(unsafe.Pointer(&a))
h = i.typ.hasher
return
}
func newHashSeed() uintptr {
return uintptr(rand.Int())
}
// noescape hides a pointer from escape analysis. It is the identity function
// but escape analysis doesn't think the output depends on the input.
// noescape is inlined and currently compiles down to zero instructions.
// USE CAREFULLY!
// This was copied from the runtime (via pkg "strings"); see issues 23382 and 7921.
//
//go:nosplit
//go:nocheckptr
func noescape(p unsafe.Pointer) unsafe.Pointer {
x := uintptr(p)
return unsafe.Pointer(x ^ 0)
}
type mapiface struct {
typ *maptype
val *hmap
}
// go/src/runtime/type.go
type maptype struct {
typ _type
key *_type
elem *_type
bucket *_type
// function for hashing keys (ptr to key, seed) -> hash
hasher func(unsafe.Pointer, uintptr) uintptr
keysize uint8
elemsize uint8
bucketsize uint16
flags uint32
}
// go/src/runtime/map.go
type hmap struct {
count int
flags uint8
B uint8
noverflow uint16
// hash seed
hash0 uint32
buckets unsafe.Pointer
oldbuckets unsafe.Pointer
nevacuate uintptr
// true type is *mapextra
// but we don't need this data
extra unsafe.Pointer
}
// go/src/runtime/type.go
type tflag uint8
type nameOff int32
type typeOff int32
// go/src/runtime/type.go
type _type struct {
size uintptr
ptrdata uintptr
hash uint32
tflag tflag
align uint8
fieldAlign uint8
kind uint8
equal func(unsafe.Pointer, unsafe.Pointer) bool
gcdata *byte
str nameOff
ptrToThis typeOff
}

5
vendor/github.com/dolthub/swiss/.gitignore generated vendored
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@ -1,5 +0,0 @@
**/.idea/
.vscode
.run
venv
.DS_Store

201
vendor/github.com/dolthub/swiss/LICENSE generated vendored
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@ -1,201 +0,0 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
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otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
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not limited to compiled object code, generated documentation,
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"Work" shall mean the work of authorship, whether in Source or
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"Contribution" shall mean any work of authorship, including
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whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
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the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
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License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
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APPENDIX: How to apply the Apache License to your work.
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boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

54
vendor/github.com/dolthub/swiss/README.md generated vendored
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@ -1,54 +0,0 @@
# SwissMap
SwissMap is a hash table adapated from the "SwissTable" family of hash tables from [Abseil](https://abseil.io/blog/20180927-swisstables). It uses [AES](https://github.com/dolthub/maphash) instructions for fast-hashing and performs key lookups in parallel using [SSE](https://en.wikipedia.org/wiki/Streaming_SIMD_Extensions) instructions. Because of these optimizations, SwissMap is faster and more memory efficient than Golang's built-in `map`. If you'd like to learn more about its design and implementation, check out this [blog post](https://www.dolthub.com/blog/2023-03-28-swiss-map/) announcing its release.
## Example
SwissMap exposes the same interface as the built-in `map`. Give it a try using this [Go playground](https://go.dev/play/p/JPDC5WhYN7g).
```go
package main
import "github.com/dolthub/swiss"
func main() {
m := swiss.NewMap[string, int](42)
m.Put("foo", 1)
m.Put("bar", 2)
m.Iter(func(k string, v int) (stop bool) {
println("iter", k, v)
return false // continue
})
if x, ok := m.Get("foo"); ok {
println(x)
}
if m.Has("bar") {
x, _ := m.Get("bar")
println(x)
}
m.Put("foo", -1)
m.Delete("bar")
if x, ok := m.Get("foo"); ok {
println(x)
}
if m.Has("bar") {
x, _ := m.Get("bar")
println(x)
}
m.Clear()
// Output:
// iter foo 1
// iter bar 2
// 1
// 2
// -1
}
```

58
vendor/github.com/dolthub/swiss/bits.go generated vendored
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@ -1,58 +0,0 @@
// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !amd64 || nosimd
package swiss
import (
"math/bits"
"unsafe"
)
const (
groupSize = 8
maxAvgGroupLoad = 7
loBits uint64 = 0x0101010101010101
hiBits uint64 = 0x8080808080808080
)
type bitset uint64
func metaMatchH2(m *metadata, h h2) bitset {
// https://graphics.stanford.edu/~seander/bithacks.html##ValueInWord
return hasZeroByte(castUint64(m) ^ (loBits * uint64(h)))
}
func metaMatchEmpty(m *metadata) bitset {
return hasZeroByte(castUint64(m) ^ hiBits)
}
func nextMatch(b *bitset) uint32 {
s := uint32(bits.TrailingZeros64(uint64(*b)))
*b &= ^(1 << s) // clear bit |s|
return s >> 3 // div by 8
}
func hasZeroByte(x uint64) bitset {
return bitset(((x - loBits) & ^(x)) & hiBits)
}
func castUint64(m *metadata) uint64 {
return *(*uint64)((unsafe.Pointer)(m))
}
//go:linkname fastrand runtime.fastrand
func fastrand() uint32

50
vendor/github.com/dolthub/swiss/bits_amd64.go generated vendored
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@ -1,50 +0,0 @@
// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build amd64 && !nosimd
package swiss
import (
"math/bits"
_ "unsafe"
"github.com/dolthub/swiss/simd"
)
const (
groupSize = 16
maxAvgGroupLoad = 14
)
type bitset uint16
func metaMatchH2(m *metadata, h h2) bitset {
b := simd.MatchMetadata((*[16]int8)(m), int8(h))
return bitset(b)
}
func metaMatchEmpty(m *metadata) bitset {
b := simd.MatchMetadata((*[16]int8)(m), empty)
return bitset(b)
}
func nextMatch(b *bitset) (s uint32) {
s = uint32(bits.TrailingZeros16(uint16(*b)))
*b &= ^(1 << s) // clear bit |s|
return
}
//go:linkname fastrand runtime.fastrand
func fastrand() uint32

359
vendor/github.com/dolthub/swiss/map.go generated vendored
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@ -1,359 +0,0 @@
// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package swiss
import (
"github.com/dolthub/maphash"
)
const (
maxLoadFactor = float32(maxAvgGroupLoad) / float32(groupSize)
)
// Map is an open-addressing hash map
// based on Abseil's flat_hash_map.
type Map[K comparable, V any] struct {
ctrl []metadata
groups []group[K, V]
hash maphash.Hasher[K]
resident uint32
dead uint32
limit uint32
}
// metadata is the h2 metadata array for a group.
// find operations first probe the controls bytes
// to filter candidates before matching keys
type metadata [groupSize]int8
// group is a group of 16 key-value pairs
type group[K comparable, V any] struct {
keys [groupSize]K
values [groupSize]V
}
const (
h1Mask uint64 = 0xffff_ffff_ffff_ff80
h2Mask uint64 = 0x0000_0000_0000_007f
empty int8 = -128 // 0b1000_0000
tombstone int8 = -2 // 0b1111_1110
)
// h1 is a 57 bit hash prefix
type h1 uint64
// h2 is a 7 bit hash suffix
type h2 int8
// NewMap constructs a Map.
func NewMap[K comparable, V any](sz uint32) (m *Map[K, V]) {
groups := numGroups(sz)
m = &Map[K, V]{
ctrl: make([]metadata, groups),
groups: make([]group[K, V], groups),
hash: maphash.NewHasher[K](),
limit: groups * maxAvgGroupLoad,
}
for i := range m.ctrl {
m.ctrl[i] = newEmptyMetadata()
}
return
}
// Has returns true if |key| is present in |m|.
func (m *Map[K, V]) Has(key K) (ok bool) {
hi, lo := splitHash(m.hash.Hash(key))
g := probeStart(hi, len(m.groups))
for { // inlined find loop
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s := nextMatch(&matches)
if key == m.groups[g].keys[s] {
ok = true
return
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 {
ok = false
return
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
// Get returns the |value| mapped by |key| if one exists.
func (m *Map[K, V]) Get(key K) (value V, ok bool) {
hi, lo := splitHash(m.hash.Hash(key))
g := probeStart(hi, len(m.groups))
for { // inlined find loop
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s := nextMatch(&matches)
if key == m.groups[g].keys[s] {
value, ok = m.groups[g].values[s], true
return
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 {
ok = false
return
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
// Put attempts to insert |key| and |value|
func (m *Map[K, V]) Put(key K, value V) {
if m.resident >= m.limit {
m.rehash(m.nextSize())
}
hi, lo := splitHash(m.hash.Hash(key))
g := probeStart(hi, len(m.groups))
for { // inlined find loop
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s := nextMatch(&matches)
if key == m.groups[g].keys[s] { // update
m.groups[g].keys[s] = key
m.groups[g].values[s] = value
return
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 { // insert
s := nextMatch(&matches)
m.groups[g].keys[s] = key
m.groups[g].values[s] = value
m.ctrl[g][s] = int8(lo)
m.resident++
return
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
// Delete attempts to remove |key|, returns true successful.
func (m *Map[K, V]) Delete(key K) (ok bool) {
hi, lo := splitHash(m.hash.Hash(key))
g := probeStart(hi, len(m.groups))
for {
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s := nextMatch(&matches)
if key == m.groups[g].keys[s] {
ok = true
// optimization: if |m.ctrl[g]| contains any empty
// metadata bytes, we can physically delete |key|
// rather than placing a tombstone.
// The observation is that any probes into group |g|
// would already be terminated by the existing empty
// slot, and therefore reclaiming slot |s| will not
// cause premature termination of probes into |g|.
if metaMatchEmpty(&m.ctrl[g]) != 0 {
m.ctrl[g][s] = empty
m.resident--
} else {
m.ctrl[g][s] = tombstone
m.dead++
}
var k K
var v V
m.groups[g].keys[s] = k
m.groups[g].values[s] = v
return
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 { // |key| absent
ok = false
return
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
// Iter iterates the elements of the Map, passing them to the callback.
// It guarantees that any key in the Map will be visited only once, and
// for un-mutated Maps, every key will be visited once. If the Map is
// Mutated during iteration, mutations will be reflected on return from
// Iter, but the set of keys visited by Iter is non-deterministic.
func (m *Map[K, V]) Iter(cb func(k K, v V) (stop bool)) {
// take a consistent view of the table in case
// we rehash during iteration
ctrl, groups := m.ctrl, m.groups
// pick a random starting group
g := randIntN(len(groups))
for n := 0; n < len(groups); n++ {
for s, c := range ctrl[g] {
if c == empty || c == tombstone {
continue
}
k, v := groups[g].keys[s], groups[g].values[s]
if stop := cb(k, v); stop {
return
}
}
g++
if g >= uint32(len(groups)) {
g = 0
}
}
}
// Clear removes all elements from the Map.
func (m *Map[K, V]) Clear() {
for i, c := range m.ctrl {
for j := range c {
m.ctrl[i][j] = empty
}
}
var k K
var v V
for i := range m.groups {
g := &m.groups[i]
for i := range g.keys {
g.keys[i] = k
g.values[i] = v
}
}
m.resident, m.dead = 0, 0
}
// Count returns the number of elements in the Map.
func (m *Map[K, V]) Count() int {
return int(m.resident - m.dead)
}
// Capacity returns the number of additional elements
// the can be added to the Map before resizing.
func (m *Map[K, V]) Capacity() int {
return int(m.limit - m.resident)
}
// find returns the location of |key| if present, or its insertion location if absent.
// for performance, find is manually inlined into public methods.
func (m *Map[K, V]) find(key K, hi h1, lo h2) (g, s uint32, ok bool) {
g = probeStart(hi, len(m.groups))
for {
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s = nextMatch(&matches)
if key == m.groups[g].keys[s] {
return g, s, true
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 {
s = nextMatch(&matches)
return g, s, false
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
func (m *Map[K, V]) nextSize() (n uint32) {
n = uint32(len(m.groups)) * 2
if m.dead >= (m.resident / 2) {
n = uint32(len(m.groups))
}
return
}
func (m *Map[K, V]) rehash(n uint32) {
groups, ctrl := m.groups, m.ctrl
m.groups = make([]group[K, V], n)
m.ctrl = make([]metadata, n)
for i := range m.ctrl {
m.ctrl[i] = newEmptyMetadata()
}
m.hash = maphash.NewSeed(m.hash)
m.limit = n * maxAvgGroupLoad
m.resident, m.dead = 0, 0
for g := range ctrl {
for s := range ctrl[g] {
c := ctrl[g][s]
if c == empty || c == tombstone {
continue
}
m.Put(groups[g].keys[s], groups[g].values[s])
}
}
}
func (m *Map[K, V]) loadFactor() float32 {
slots := float32(len(m.groups) * groupSize)
return float32(m.resident-m.dead) / slots
}
// numGroups returns the minimum number of groups needed to store |n| elems.
func numGroups(n uint32) (groups uint32) {
groups = (n + maxAvgGroupLoad - 1) / maxAvgGroupLoad
if groups == 0 {
groups = 1
}
return
}
func newEmptyMetadata() (meta metadata) {
for i := range meta {
meta[i] = empty
}
return
}
func splitHash(h uint64) (h1, h2) {
return h1((h & h1Mask) >> 7), h2(h & h2Mask)
}
func probeStart(hi h1, groups int) uint32 {
return fastModN(uint32(hi), uint32(groups))
}
// lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/
func fastModN(x, n uint32) uint32 {
return uint32((uint64(x) * uint64(n)) >> 32)
}
// randIntN returns a random number in the interval [0, n).
func randIntN(n int) uint32 {
return fastModN(fastrand(), uint32(n))
}

19
vendor/github.com/dolthub/swiss/simd/match.s generated vendored
View file

@ -1,19 +0,0 @@
// Code generated by command: go run asm.go -out match.s -stubs match_amd64.go. DO NOT EDIT.
//go:build amd64
#include "textflag.h"
// func MatchMetadata(metadata *[16]int8, hash int8) uint16
// Requires: SSE2, SSSE3
TEXT ·MatchMetadata(SB), NOSPLIT, $0-18
MOVQ metadata+0(FP), AX
MOVBLSX hash+8(FP), CX
MOVD CX, X0
PXOR X1, X1
PSHUFB X1, X0
MOVOU (AX), X1
PCMPEQB X1, X0
PMOVMSKB X0, AX
MOVW AX, ret+16(FP)
RET

9
vendor/github.com/dolthub/swiss/simd/match_amd64.go generated vendored
View file

@ -1,9 +0,0 @@
// Code generated by command: go run asm.go -out match.s -stubs match_amd64.go. DO NOT EDIT.
//go:build amd64
package simd
// MatchMetadata performs a 16-way probe of |metadata| using SSE instructions
// nb: |metadata| must be an aligned pointer
func MatchMetadata(metadata *[16]int8, hash int8) uint16

9
vendor/modules.txt vendored
View file

@ -52,7 +52,7 @@ codeberg.org/gruf/go-maps
# codeberg.org/gruf/go-mempool v0.0.0-20240507125005-cef10d64a760
## explicit; go 1.22.2
codeberg.org/gruf/go-mempool
# codeberg.org/gruf/go-mutexes v1.5.0
# codeberg.org/gruf/go-mutexes v1.5.1
## explicit; go 1.22.2
codeberg.org/gruf/go-mutexes
# codeberg.org/gruf/go-runners v1.6.2
@ -179,13 +179,6 @@ github.com/disintegration/imaging
# github.com/docker/go-units v0.5.0
## explicit
github.com/docker/go-units
# github.com/dolthub/maphash v0.1.0
## explicit; go 1.18
github.com/dolthub/maphash
# github.com/dolthub/swiss v0.2.1
## explicit; go 1.18
github.com/dolthub/swiss
github.com/dolthub/swiss/simd
# github.com/dsoprea/go-exif/v3 v3.0.0-20210625224831-a6301f85c82b
## explicit; go 1.12
github.com/dsoprea/go-exif/v3