forked from mirrors/gotosocial
199 lines
6 KiB
Go
199 lines
6 KiB
Go
/*
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* Copyright 2021 ByteDance Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package encoder
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import (
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"encoding"
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"reflect"
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"sync"
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"unsafe"
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"github.com/bytedance/sonic/internal/native"
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"github.com/bytedance/sonic/internal/rt"
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)
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type _MapPair struct {
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k string // when the map key is integer, k is pointed to m
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v unsafe.Pointer
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m [32]byte
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}
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type _MapIterator struct {
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it rt.GoMapIterator // must be the first field
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kv rt.GoSlice // slice of _MapPair
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ki int
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}
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var (
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iteratorPool = sync.Pool{}
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iteratorPair = rt.UnpackType(reflect.TypeOf(_MapPair{}))
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)
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func init() {
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if unsafe.Offsetof(_MapIterator{}.it) != 0 {
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panic("_MapIterator.it is not the first field")
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}
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}
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func newIterator() *_MapIterator {
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if v := iteratorPool.Get(); v == nil {
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return new(_MapIterator)
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} else {
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return resetIterator(v.(*_MapIterator))
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}
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}
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func resetIterator(p *_MapIterator) *_MapIterator {
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p.ki = 0
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p.it = rt.GoMapIterator{}
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p.kv.Len = 0
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return p
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}
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func (self *_MapIterator) at(i int) *_MapPair {
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return (*_MapPair)(unsafe.Pointer(uintptr(self.kv.Ptr) + uintptr(i) * unsafe.Sizeof(_MapPair{})))
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}
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func (self *_MapIterator) add() (p *_MapPair) {
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p = self.at(self.kv.Len)
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self.kv.Len++
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return
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}
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func (self *_MapIterator) data() (p []_MapPair) {
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*(*rt.GoSlice)(unsafe.Pointer(&p)) = self.kv
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return
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}
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func (self *_MapIterator) append(t *rt.GoType, k unsafe.Pointer, v unsafe.Pointer) (err error) {
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p := self.add()
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p.v = v
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/* check for strings */
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if tk := t.Kind(); tk != reflect.String {
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return self.appendGeneric(p, t, tk, k)
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}
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/* fast path for strings */
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p.k = *(*string)(k)
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return nil
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}
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func (self *_MapIterator) appendGeneric(p *_MapPair, t *rt.GoType, v reflect.Kind, k unsafe.Pointer) error {
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switch v {
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case reflect.Int : p.k = rt.Mem2Str(p.m[:native.I64toa(&p.m[0], int64(*(*int)(k)))]) ; return nil
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case reflect.Int8 : p.k = rt.Mem2Str(p.m[:native.I64toa(&p.m[0], int64(*(*int8)(k)))]) ; return nil
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case reflect.Int16 : p.k = rt.Mem2Str(p.m[:native.I64toa(&p.m[0], int64(*(*int16)(k)))]) ; return nil
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case reflect.Int32 : p.k = rt.Mem2Str(p.m[:native.I64toa(&p.m[0], int64(*(*int32)(k)))]) ; return nil
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case reflect.Int64 : p.k = rt.Mem2Str(p.m[:native.I64toa(&p.m[0], *(*int64)(k))]) ; return nil
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case reflect.Uint : p.k = rt.Mem2Str(p.m[:native.U64toa(&p.m[0], uint64(*(*uint)(k)))]) ; return nil
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case reflect.Uint8 : p.k = rt.Mem2Str(p.m[:native.U64toa(&p.m[0], uint64(*(*uint8)(k)))]) ; return nil
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case reflect.Uint16 : p.k = rt.Mem2Str(p.m[:native.U64toa(&p.m[0], uint64(*(*uint16)(k)))]) ; return nil
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case reflect.Uint32 : p.k = rt.Mem2Str(p.m[:native.U64toa(&p.m[0], uint64(*(*uint32)(k)))]) ; return nil
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case reflect.Uint64 : p.k = rt.Mem2Str(p.m[:native.U64toa(&p.m[0], *(*uint64)(k))]) ; return nil
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case reflect.Uintptr : p.k = rt.Mem2Str(p.m[:native.U64toa(&p.m[0], uint64(*(*uintptr)(k)))]) ; return nil
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case reflect.Interface : return self.appendInterface(p, t, k)
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case reflect.Struct, reflect.Ptr : return self.appendConcrete(p, t, k)
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default : panic("unexpected map key type")
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}
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}
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func (self *_MapIterator) appendConcrete(p *_MapPair, t *rt.GoType, k unsafe.Pointer) (err error) {
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// compiler has already checked that the type implements the encoding.MarshalText interface
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if !t.Indirect() {
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k = *(*unsafe.Pointer)(k)
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}
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eface := rt.GoEface{Value: k, Type: t}.Pack()
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out, err := eface.(encoding.TextMarshaler).MarshalText()
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if err != nil {
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return err
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}
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p.k = rt.Mem2Str(out)
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return
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}
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func (self *_MapIterator) appendInterface(p *_MapPair, t *rt.GoType, k unsafe.Pointer) (err error) {
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if len(rt.IfaceType(t).Methods) == 0 {
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panic("unexpected map key type")
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} else if p.k, err = asText(k); err == nil {
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return nil
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} else {
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return
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}
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}
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func iteratorStop(p *_MapIterator) {
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iteratorPool.Put(p)
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}
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func iteratorNext(p *_MapIterator) {
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i := p.ki
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t := &p.it
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/* check for unordered iteration */
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if i < 0 {
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mapiternext(t)
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return
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}
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/* check for end of iteration */
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if p.ki >= p.kv.Len {
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t.K = nil
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t.V = nil
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return
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}
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/* update the key-value pair, and increase the pointer */
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t.K = unsafe.Pointer(&p.at(p.ki).k)
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t.V = p.at(p.ki).v
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p.ki++
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}
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func iteratorStart(t *rt.GoMapType, m *rt.GoMap, fv uint64) (*_MapIterator, error) {
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it := newIterator()
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mapiterinit(t, m, &it.it)
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/* check for key-sorting, empty map don't need sorting */
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if m.Count == 0 || (fv & uint64(SortMapKeys)) == 0 {
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it.ki = -1
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return it, nil
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}
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/* pre-allocate space if needed */
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if m.Count > it.kv.Cap {
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it.kv = growslice(iteratorPair, it.kv, m.Count)
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}
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/* dump all the key-value pairs */
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for ; it.it.K != nil; mapiternext(&it.it) {
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if err := it.append(t.Key, it.it.K, it.it.V); err != nil {
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iteratorStop(it)
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return nil, err
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}
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}
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/* sort the keys, map with only 1 item don't need sorting */
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if it.ki = 1; m.Count > 1 {
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radixQsort(it.data(), 0, maxDepth(it.kv.Len))
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}
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/* load the first pair into iterator */
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it.it.V = it.at(0).v
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it.it.K = unsafe.Pointer(&it.at(0).k)
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return it, nil
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}
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