service/vendor/github.com/bytedance/sonic/internal/rt/stackmap.go

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2023-12-21 22:17:40 +08:00
/**
* Copyright 2023 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 rt
import (
`fmt`
`strings`
`unsafe`
)
type Bitmap struct {
N int
B []byte
}
func (self *Bitmap) grow() {
if self.N >= len(self.B) * 8 {
self.B = append(self.B, 0)
}
}
func (self *Bitmap) mark(i int, bv int) {
if bv != 0 {
self.B[i / 8] |= 1 << (i % 8)
} else {
self.B[i / 8] &^= 1 << (i % 8)
}
}
func (self *Bitmap) Set(i int, bv int) {
if i >= self.N {
panic("bitmap: invalid bit position")
} else {
self.mark(i, bv)
}
}
func (self *Bitmap) Append(bv int) {
self.grow()
self.mark(self.N, bv)
self.N++
}
func (self *Bitmap) AppendMany(n int, bv int) {
for i := 0; i < n; i++ {
self.Append(bv)
}
}
// var (
// _stackMapLock = sync.Mutex{}
// _stackMapCache = make(map[*StackMap]struct{})
// )
type BitVec struct {
N uintptr
B unsafe.Pointer
}
func (self BitVec) Bit(i uintptr) byte {
return (*(*byte)(unsafe.Pointer(uintptr(self.B) + i / 8)) >> (i % 8)) & 1
}
func (self BitVec) String() string {
var i uintptr
var v []string
/* add each bit */
for i = 0; i < self.N; i++ {
v = append(v, fmt.Sprintf("%d", self.Bit(i)))
}
/* join them together */
return fmt.Sprintf(
"BitVec { %s }",
strings.Join(v, ", "),
)
}
type StackMap struct {
N int32
L int32
B [1]byte
}
// func (self *StackMap) add() {
// _stackMapLock.Lock()
// _stackMapCache[self] = struct{}{}
// _stackMapLock.Unlock()
// }
func (self *StackMap) Pin() uintptr {
// self.add()
return uintptr(unsafe.Pointer(self))
}
func (self *StackMap) Get(i int32) BitVec {
return BitVec {
N: uintptr(self.L),
B: unsafe.Pointer(uintptr(unsafe.Pointer(&self.B)) + uintptr(i * ((self.L + 7) >> 3))),
}
}
func (self *StackMap) String() string {
sb := strings.Builder{}
sb.WriteString("StackMap {")
/* dump every stack map */
for i := int32(0); i < self.N; i++ {
sb.WriteRune('\n')
sb.WriteString(" " + self.Get(i).String())
}
/* close the stackmap */
sb.WriteString("\n}")
return sb.String()
}
func (self *StackMap) MarshalBinary() ([]byte, error) {
size := int(self.N) * int(self.L) + int(unsafe.Sizeof(self.L)) + int(unsafe.Sizeof(self.N))
return BytesFrom(unsafe.Pointer(self), size, size), nil
}
var (
byteType = UnpackEface(byte(0)).Type
)
const (
_StackMapSize = unsafe.Sizeof(StackMap{})
)
//go:linkname mallocgc runtime.mallocgc
//goland:noinspection GoUnusedParameter
func mallocgc(nb uintptr, vt *GoType, zero bool) unsafe.Pointer
type StackMapBuilder struct {
b Bitmap
}
//go:nocheckptr
func (self *StackMapBuilder) Build() (p *StackMap) {
nb := len(self.b.B)
bm := mallocgc(_StackMapSize + uintptr(nb) - 1, byteType, false)
/* initialize as 1 bitmap of N bits */
p = (*StackMap)(bm)
p.N, p.L = 1, int32(self.b.N)
copy(BytesFrom(unsafe.Pointer(&p.B), nb, nb), self.b.B)
return
}
func (self *StackMapBuilder) AddField(ptr bool) {
if ptr {
self.b.Append(1)
} else {
self.b.Append(0)
}
}
func (self *StackMapBuilder) AddFields(n int, ptr bool) {
if ptr {
self.b.AppendMany(n, 1)
} else {
self.b.AppendMany(n, 0)
}
}