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bucket.go
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bucket.go
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/*
* Copyright 2022 ByteDance 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 encoder
import (
`sync`
`unsafe`
`github.com/cloudwego/frugal/internal/rt`
)
type _Bucket struct {
h int
v uint64
p unsafe.Pointer
}
func (self _Bucket) String() string {
return rt.StringFrom(self.p, int(self.v))
}
var (
bucketPool sync.Pool
)
const (
_BucketSize = unsafe.Sizeof(_Bucket{})
)
//go:noescape
//go:linkname memclrNoHeapPointers runtime.memclrNoHeapPointers
//goland:noinspection GoUnusedParameter
func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
func newBucket(n int) []_Bucket {
var r []_Bucket
var v interface{}
/* attempt to get one from pool */
if v = bucketPool.Get(); v == nil {
return make([]_Bucket, n)
}
/* check for capacity, and update it's capacity */
if r = v.([]_Bucket); n <= cap(r) {
return bucketClear(r[:n:cap(r)])
}
/* not enough space, reallocate a new one */
bucketPool.Put(v)
return make([]_Bucket, n)
}
func freeBucket(p []_Bucket) {
bucketPool.Put(p)
}
func bucketClear(bm []_Bucket) []_Bucket {
v := (*rt.GoSlice)(unsafe.Pointer(&bm))
memclrNoHeapPointers(v.Ptr, uintptr(v.Len) * _BucketSize)
return bm
}
func bucketAppend64(bm []_Bucket, v uint64) bool {
h := hash64(v)
i := h % len(bm)
/* search for an empty slot (linear probing, this must
* success, since item count never exceeds the bucket size) */
for bm[i].h != 0 {
if bm[i].v == v {
return true
} else {
i = (i + 1) % len(bm)
}
}
/* assign the slot */
bm[i].h = h
bm[i].v = v
return false
}
func bucketAppendStr(bm []_Bucket, p unsafe.Pointer) bool {
h := hashstr(p)
i := h % len(bm)
v := (*rt.GoString)(p)
/* search for an empty slot (linear probing, this must
* success, since item count never exceeds the bucket size) */
for bm[i].h != 0 {
if bm[i].h == h && bm[i].v == uint64(v.Len) && (bm[i].p == v.Ptr || bm[i].String() == *(*string)(p)) {
return true
} else {
i = (i + 1) % len(bm)
}
}
/* assign the slot */
bm[i].h = h
bm[i].p = v.Ptr
bm[i].v = uint64(v.Len)
return false
}