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/*
* Copyright 2021 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 alg
import (
"encoding"
"reflect"
"strconv"
"sync"
"unsafe"
"github.com/bytedance/sonic/internal/encoder/vars"
"github.com/bytedance/sonic/internal/rt"
)
type _MapPair struct {
k string // when the map key is integer, k is pointed to m
v unsafe.Pointer
m [32]byte
}
type MapIterator struct {
It rt.GoMapIterator // must be the first field
kv rt.GoSlice // slice of _MapPair
ki int
}
var (
iteratorPool = sync.Pool{}
iteratorPair = rt.UnpackType(reflect.TypeOf(_MapPair{}))
)
func init() {
if unsafe.Offsetof(MapIterator{}.It) != 0 {
panic("_MapIterator.it is not the first field")
}
}
func newIterator() *MapIterator {
if v := iteratorPool.Get(); v == nil {
return new(MapIterator)
} else {
return resetIterator(v.(*MapIterator))
}
}
func resetIterator(p *MapIterator) *MapIterator {
p.ki = 0
p.It = rt.GoMapIterator{}
p.kv.Len = 0
return p
}
func (self *MapIterator) at(i int) *_MapPair {
return (*_MapPair)(unsafe.Pointer(uintptr(self.kv.Ptr) + uintptr(i) * unsafe.Sizeof(_MapPair{})))
}
func (self *MapIterator) add() (p *_MapPair) {
p = self.at(self.kv.Len)
self.kv.Len++
return
}
func (self *MapIterator) data() (p []_MapPair) {
*(*rt.GoSlice)(unsafe.Pointer(&p)) = self.kv
return
}
func (self *MapIterator) append(t *rt.GoType, k unsafe.Pointer, v unsafe.Pointer) (err error) {
p := self.add()
p.v = v
/* check for strings */
if tk := t.Kind(); tk != reflect.String {
return self.appendGeneric(p, t, tk, k)
}
/* fast path for strings */
p.k = *(*string)(k)
return nil
}
func (self *MapIterator) appendGeneric(p *_MapPair, t *rt.GoType, v reflect.Kind, k unsafe.Pointer) error {
switch v {
case reflect.Int : p.k = rt.Mem2Str(strconv.AppendInt(p.m[:0], int64(*(*int)(k)), 10)) ; return nil
case reflect.Int8 : p.k = rt.Mem2Str(strconv.AppendInt(p.m[:0], int64(*(*int8)(k)), 10)) ; return nil
case reflect.Int16 : p.k = rt.Mem2Str(strconv.AppendInt(p.m[:0], int64(*(*int16)(k)), 10)) ; return nil
case reflect.Int32 : p.k = rt.Mem2Str(strconv.AppendInt(p.m[:0], int64(*(*int32)(k)), 10)) ; return nil
case reflect.Int64 : p.k = rt.Mem2Str(strconv.AppendInt(p.m[:0], int64(*(*int64)(k)), 10)) ; return nil
case reflect.Uint : p.k = rt.Mem2Str(strconv.AppendUint(p.m[:0], uint64(*(*uint)(k)), 10)) ; return nil
case reflect.Uint8 : p.k = rt.Mem2Str(strconv.AppendUint(p.m[:0], uint64(*(*uint8)(k)), 10)) ; return nil
case reflect.Uint16 : p.k = rt.Mem2Str(strconv.AppendUint(p.m[:0], uint64(*(*uint16)(k)), 10)) ; return nil
case reflect.Uint32 : p.k = rt.Mem2Str(strconv.AppendUint(p.m[:0], uint64(*(*uint32)(k)), 10)) ; return nil
case reflect.Uint64 : p.k = rt.Mem2Str(strconv.AppendUint(p.m[:0], uint64(*(*uint64)(k)), 10)) ; return nil
case reflect.Uintptr : p.k = rt.Mem2Str(strconv.AppendUint(p.m[:0], uint64(*(*uintptr)(k)), 10)) ; return nil
case reflect.Interface : return self.appendInterface(p, t, k)
case reflect.Struct, reflect.Ptr : return self.appendConcrete(p, t, k)
default : panic("unexpected map key type")
}
}
func (self *MapIterator) appendConcrete(p *_MapPair, t *rt.GoType, k unsafe.Pointer) (err error) {
// compiler has already checked that the type implements the encoding.MarshalText interface
if !t.Indirect() {
k = *(*unsafe.Pointer)(k)
}
eface := rt.GoEface{Value: k, Type: t}.Pack()
out, err := eface.(encoding.TextMarshaler).MarshalText()
if err != nil {
return err
}
p.k = rt.Mem2Str(out)
return
}
func (self *MapIterator) appendInterface(p *_MapPair, t *rt.GoType, k unsafe.Pointer) (err error) {
if len(rt.IfaceType(t).Methods) == 0 {
panic("unexpected map key type")
} else if p.k, err = asText(k); err == nil {
return nil
} else {
return
}
}
func IteratorStop(p *MapIterator) {
iteratorPool.Put(p)
}
func IteratorNext(p *MapIterator) {
i := p.ki
t := &p.It
/* check for unordered iteration */
if i < 0 {
rt.Mapiternext(t)
return
}
/* check for end of iteration */
if p.ki >= p.kv.Len {
t.K = nil
t.V = nil
return
}
/* update the key-value pair, and increase the pointer */
t.K = unsafe.Pointer(&p.at(p.ki).k)
t.V = p.at(p.ki).v
p.ki++
}
func IteratorStart(t *rt.GoMapType, m *rt.GoMap, fv uint64) (*MapIterator, error) {
it := newIterator()
rt.Mapiterinit(t, m, &it.It)
/* check for key-sorting, empty map don't need sorting */
if m.Count == 0 || (fv & (1<<BitSortMapKeys)) == 0 {
it.ki = -1
return it, nil
}
/* pre-allocate space if needed */
if m.Count > it.kv.Cap {
it.kv = rt.GrowSlice(iteratorPair, it.kv, m.Count)
}
/* dump all the key-value pairs */
for ; it.It.K != nil; rt.Mapiternext(&it.It) {
if err := it.append(t.Key, it.It.K, it.It.V); err != nil {
IteratorStop(it)
return nil, err
}
}
/* sort the keys, map with only 1 item don't need sorting */
if it.ki = 1; m.Count > 1 {
radixQsort(it.data(), 0, maxDepth(it.kv.Len))
}
/* load the first pair into iterator */
it.It.V = it.at(0).v
it.It.K = unsafe.Pointer(&it.at(0).k)
return it, nil
}
func asText(v unsafe.Pointer) (string, error) {
text := rt.AssertI2I(rt.UnpackType(vars.EncodingTextMarshalerType), *(*rt.GoIface)(v))
r, e := (*(*encoding.TextMarshaler)(unsafe.Pointer(&text))).MarshalText()
return rt.Mem2Str(r), e
}
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