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remove feature prefix
This commit is contained in:
Tao Wen
551
reflect.go
Normal file
551
reflect.go
Normal file
@ -0,0 +1,551 @@
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package jsoniter
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import (
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"encoding"
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"encoding/json"
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"fmt"
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"reflect"
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"time"
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"unsafe"
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"github.com/v2pro/plz/reflect2"
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)
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// ValDecoder is an internal type registered to cache as needed.
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// Don't confuse jsoniter.ValDecoder with json.Decoder.
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// For json.Decoder's adapter, refer to jsoniter.AdapterDecoder(todo link).
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//
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// Reflection on type to create decoders, which is then cached
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// Reflection on value is avoided as we can, as the reflect.Value itself will allocate, with following exceptions
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// 1. create instance of new value, for example *int will need a int to be allocated
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// 2. append to slice, if the existing cap is not enough, allocate will be done using Reflect.New
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// 3. assignment to map, both key and value will be reflect.Value
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// For a simple struct binding, it will be reflect.Value free and allocation free
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type ValDecoder interface {
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Decode(ptr unsafe.Pointer, iter *Iterator)
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}
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// ValEncoder is an internal type registered to cache as needed.
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// Don't confuse jsoniter.ValEncoder with json.Encoder.
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// For json.Encoder's adapter, refer to jsoniter.AdapterEncoder(todo godoc link).
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type ValEncoder interface {
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IsEmpty(ptr unsafe.Pointer) bool
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Encode(ptr unsafe.Pointer, stream *Stream)
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}
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type checkIsEmpty interface {
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IsEmpty(ptr unsafe.Pointer) bool
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}
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var jsonNumberType reflect.Type
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var jsoniterNumberType reflect.Type
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var jsonRawMessageType reflect.Type
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var jsoniterRawMessageType reflect.Type
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var anyType reflect.Type
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var marshalerType reflect.Type
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var unmarshalerType reflect.Type
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var textMarshalerType reflect.Type
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var textUnmarshalerType reflect.Type
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func init() {
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jsonNumberType = reflect.TypeOf((*json.Number)(nil)).Elem()
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jsoniterNumberType = reflect.TypeOf((*Number)(nil)).Elem()
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jsonRawMessageType = reflect.TypeOf((*json.RawMessage)(nil)).Elem()
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jsoniterRawMessageType = reflect.TypeOf((*RawMessage)(nil)).Elem()
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anyType = reflect.TypeOf((*Any)(nil)).Elem()
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marshalerType = reflect.TypeOf((*json.Marshaler)(nil)).Elem()
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unmarshalerType = reflect.TypeOf((*json.Unmarshaler)(nil)).Elem()
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textMarshalerType = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem()
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textUnmarshalerType = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem()
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}
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// ReadVal copy the underlying JSON into go interface, same as json.Unmarshal
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func (iter *Iterator) ReadVal(obj interface{}) {
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typ := reflect.TypeOf(obj)
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cacheKey := typ.Elem()
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decoder := decoderOfType(iter.cfg, "", cacheKey)
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e := (*emptyInterface)(unsafe.Pointer(&obj))
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if e.word == nil {
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iter.ReportError("ReadVal", "can not read into nil pointer")
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return
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}
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decoder.Decode(e.word, iter)
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}
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// WriteVal copy the go interface into underlying JSON, same as json.Marshal
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func (stream *Stream) WriteVal(val interface{}) {
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if nil == val {
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stream.WriteNil()
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return
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}
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typ := reflect.TypeOf(val)
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encoder := stream.cfg.EncoderOf(typ)
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encoder.Encode(reflect2.PtrOf(val), stream)
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}
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func (cfg *frozenConfig) DecoderOf(typ reflect.Type) ValDecoder {
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cacheKey := typ
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decoder := cfg.getDecoderFromCache(cacheKey)
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if decoder != nil {
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return decoder
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}
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decoder = decoderOfType(cfg, "", typ)
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cfg.addDecoderToCache(cacheKey, decoder)
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return decoder
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}
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func decoderOfType(cfg *frozenConfig, prefix string, typ reflect.Type) ValDecoder {
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decoder := getTypeDecoderFromExtension(cfg, typ)
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if decoder != nil {
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return decoder
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}
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decoder = createDecoderOfType(cfg, prefix, typ)
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for _, extension := range extensions {
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decoder = extension.DecorateDecoder(typ, decoder)
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}
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for _, extension := range cfg.extensions {
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decoder = extension.DecorateDecoder(typ, decoder)
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}
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return decoder
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}
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func createDecoderOfType(cfg *frozenConfig, prefix string, typ reflect.Type) ValDecoder {
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typeName := typ.String()
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if typ == jsonRawMessageType {
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return &jsonRawMessageCodec{}
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}
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if typ == jsoniterRawMessageType {
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return &jsoniterRawMessageCodec{}
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}
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if typ.AssignableTo(jsonNumberType) {
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return &jsonNumberCodec{}
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}
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if typ.AssignableTo(jsoniterNumberType) {
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return &jsoniterNumberCodec{}
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}
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decoder := createDecoderOfMarshaler(cfg, prefix, typ)
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if decoder != nil {
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return decoder
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}
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if typ.Kind() == reflect.Slice && typ.Elem().Kind() == reflect.Uint8 {
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sliceDecoder := decoderOfSlice(cfg, prefix, typ)
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return &base64Codec{sliceDecoder: sliceDecoder}
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}
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if typ == anyType {
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return &directAnyCodec{}
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}
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if typ.Implements(anyType) {
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return &anyCodec{}
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}
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switch typ.Kind() {
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case reflect.String:
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if typeName != "string" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*string)(nil)).Elem())
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}
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return &stringCodec{}
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case reflect.Int:
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if typeName != "int" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*int)(nil)).Elem())
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}
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return &intCodec{}
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case reflect.Int8:
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if typeName != "int8" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*int8)(nil)).Elem())
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}
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return &int8Codec{}
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case reflect.Int16:
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if typeName != "int16" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*int16)(nil)).Elem())
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}
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return &int16Codec{}
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case reflect.Int32:
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if typeName != "int32" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*int32)(nil)).Elem())
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}
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return &int32Codec{}
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case reflect.Int64:
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if typeName != "int64" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*int64)(nil)).Elem())
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}
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return &int64Codec{}
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case reflect.Uint:
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if typeName != "uint" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*uint)(nil)).Elem())
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}
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return &uintCodec{}
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case reflect.Uint8:
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if typeName != "uint8" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*uint8)(nil)).Elem())
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}
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return &uint8Codec{}
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case reflect.Uint16:
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if typeName != "uint16" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*uint16)(nil)).Elem())
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}
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return &uint16Codec{}
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case reflect.Uint32:
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if typeName != "uint32" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*uint32)(nil)).Elem())
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}
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return &uint32Codec{}
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case reflect.Uintptr:
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if typeName != "uintptr" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*uintptr)(nil)).Elem())
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}
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return &uintptrCodec{}
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case reflect.Uint64:
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if typeName != "uint64" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*uint64)(nil)).Elem())
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}
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return &uint64Codec{}
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case reflect.Float32:
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if typeName != "float32" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*float32)(nil)).Elem())
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}
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return &float32Codec{}
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case reflect.Float64:
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if typeName != "float64" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*float64)(nil)).Elem())
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}
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return &float64Codec{}
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case reflect.Bool:
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if typeName != "bool" {
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return decoderOfType(cfg, prefix, reflect.TypeOf((*bool)(nil)).Elem())
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}
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return &boolCodec{}
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case reflect.Interface:
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if typ.NumMethod() == 0 {
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return &emptyInterfaceCodec{}
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}
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return &nonEmptyInterfaceCodec{}
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case reflect.Struct:
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return decoderOfStruct(cfg, prefix, typ)
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case reflect.Array:
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return decoderOfArray(cfg, prefix, typ)
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case reflect.Slice:
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return decoderOfSlice(cfg, prefix, typ)
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case reflect.Map:
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return decoderOfMap(cfg, prefix, typ)
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case reflect.Ptr:
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return decoderOfOptional(cfg, prefix, typ)
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default:
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return &lazyErrorDecoder{err: fmt.Errorf("%s%s is unsupported type", prefix, typ.String())}
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}
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}
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func (cfg *frozenConfig) EncoderOf(typ reflect.Type) ValEncoder {
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cacheKey := typ
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encoder := cfg.getEncoderFromCache(cacheKey)
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if encoder != nil {
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return encoder
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}
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encoder = encoderOfType(cfg, "", typ)
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if shouldFixOnePtr(typ) {
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encoder = &onePtrEncoder{encoder}
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}
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cfg.addEncoderToCache(cacheKey, encoder)
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return encoder
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}
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type onePtrEncoder struct {
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encoder ValEncoder
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}
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func (encoder *onePtrEncoder) IsEmpty(ptr unsafe.Pointer) bool {
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return encoder.encoder.IsEmpty(unsafe.Pointer(&ptr))
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}
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func (encoder *onePtrEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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encoder.encoder.Encode(unsafe.Pointer(&ptr), stream)
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}
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func shouldFixOnePtr(typ reflect.Type) bool {
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if isPtrKind(typ.Kind()) {
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return true
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}
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if typ.Kind() == reflect.Struct {
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if typ.NumField() != 1 {
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return false
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}
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return shouldFixOnePtr(typ.Field(0).Type)
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}
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if typ.Kind() == reflect.Array {
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if typ.Len() != 1 {
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return false
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}
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return shouldFixOnePtr(typ.Elem())
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}
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return false
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}
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func isPtrKind(kind reflect.Kind) bool {
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switch kind {
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case reflect.Ptr, reflect.Map, reflect.Chan, reflect.Func:
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return true
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}
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return false
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}
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func encoderOfType(cfg *frozenConfig, prefix string, typ reflect.Type) ValEncoder {
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encoder := getTypeEncoderFromExtension(cfg, typ)
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if encoder != nil {
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return encoder
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}
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encoder = createEncoderOfType(cfg, prefix, typ)
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for _, extension := range extensions {
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encoder = extension.DecorateEncoder(typ, encoder)
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}
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for _, extension := range cfg.extensions {
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encoder = extension.DecorateEncoder(typ, encoder)
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}
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return encoder
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}
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func createEncoderOfType(cfg *frozenConfig, prefix string, typ reflect.Type) ValEncoder {
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if typ == jsonRawMessageType {
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return &jsonRawMessageCodec{}
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}
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if typ == jsoniterRawMessageType {
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return &jsoniterRawMessageCodec{}
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}
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if typ.AssignableTo(jsonNumberType) {
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return &jsonNumberCodec{}
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}
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if typ.AssignableTo(jsoniterNumberType) {
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return &jsoniterNumberCodec{}
|
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}
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encoder := createEncoderOfMarshaler(cfg, prefix, typ)
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if encoder != nil {
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return encoder
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}
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if typ.Kind() == reflect.Slice && typ.Elem().Kind() == reflect.Uint8 {
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return &base64Codec{}
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}
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if typ == anyType {
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return &directAnyCodec{}
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}
|
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if typ.Implements(anyType) {
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return &anyCodec{
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valType: reflect2.Type2(typ),
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}
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}
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return createEncoderOfSimpleType(cfg, prefix, typ)
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}
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func createCheckIsEmpty(cfg *frozenConfig, typ reflect.Type) checkIsEmpty {
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kind := typ.Kind()
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switch kind {
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case reflect.String:
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return &stringCodec{}
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case reflect.Int:
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return &intCodec{}
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case reflect.Int8:
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return &int8Codec{}
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case reflect.Int16:
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return &int16Codec{}
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case reflect.Int32:
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return &int32Codec{}
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case reflect.Int64:
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||||
return &int64Codec{}
|
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case reflect.Uint:
|
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return &uintCodec{}
|
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case reflect.Uint8:
|
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return &uint8Codec{}
|
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case reflect.Uint16:
|
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return &uint16Codec{}
|
||||
case reflect.Uint32:
|
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return &uint32Codec{}
|
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case reflect.Uintptr:
|
||||
return &uintptrCodec{}
|
||||
case reflect.Uint64:
|
||||
return &uint64Codec{}
|
||||
case reflect.Float32:
|
||||
return &float32Codec{}
|
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case reflect.Float64:
|
||||
return &float64Codec{}
|
||||
case reflect.Bool:
|
||||
return &boolCodec{}
|
||||
case reflect.Interface:
|
||||
return &dynamicEncoder{reflect2.Type2(typ)}
|
||||
case reflect.Struct:
|
||||
return &structEncoder{typ: typ}
|
||||
case reflect.Array:
|
||||
return &arrayEncoder{}
|
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case reflect.Slice:
|
||||
return &sliceEncoder{}
|
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case reflect.Map:
|
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return encoderOfMap(cfg, "", typ)
|
||||
case reflect.Ptr:
|
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return &OptionalEncoder{}
|
||||
default:
|
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return &lazyErrorEncoder{err: fmt.Errorf("unsupported type: %v", typ)}
|
||||
}
|
||||
}
|
||||
|
||||
func createEncoderOfSimpleType(cfg *frozenConfig, prefix string, typ reflect.Type) ValEncoder {
|
||||
typeName := typ.String()
|
||||
kind := typ.Kind()
|
||||
switch kind {
|
||||
case reflect.String:
|
||||
if typeName != "string" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*string)(nil)).Elem())
|
||||
}
|
||||
return &stringCodec{}
|
||||
case reflect.Int:
|
||||
if typeName != "int" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*int)(nil)).Elem())
|
||||
}
|
||||
return &intCodec{}
|
||||
case reflect.Int8:
|
||||
if typeName != "int8" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*int8)(nil)).Elem())
|
||||
}
|
||||
return &int8Codec{}
|
||||
case reflect.Int16:
|
||||
if typeName != "int16" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*int16)(nil)).Elem())
|
||||
}
|
||||
return &int16Codec{}
|
||||
case reflect.Int32:
|
||||
if typeName != "int32" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*int32)(nil)).Elem())
|
||||
}
|
||||
return &int32Codec{}
|
||||
case reflect.Int64:
|
||||
if typeName != "int64" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*int64)(nil)).Elem())
|
||||
}
|
||||
return &int64Codec{}
|
||||
case reflect.Uint:
|
||||
if typeName != "uint" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*uint)(nil)).Elem())
|
||||
}
|
||||
return &uintCodec{}
|
||||
case reflect.Uint8:
|
||||
if typeName != "uint8" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*uint8)(nil)).Elem())
|
||||
}
|
||||
return &uint8Codec{}
|
||||
case reflect.Uint16:
|
||||
if typeName != "uint16" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*uint16)(nil)).Elem())
|
||||
}
|
||||
return &uint16Codec{}
|
||||
case reflect.Uint32:
|
||||
if typeName != "uint32" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*uint32)(nil)).Elem())
|
||||
}
|
||||
return &uint32Codec{}
|
||||
case reflect.Uintptr:
|
||||
if typeName != "uintptr" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*uintptr)(nil)).Elem())
|
||||
}
|
||||
return &uintptrCodec{}
|
||||
case reflect.Uint64:
|
||||
if typeName != "uint64" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*uint64)(nil)).Elem())
|
||||
}
|
||||
return &uint64Codec{}
|
||||
case reflect.Float32:
|
||||
if typeName != "float32" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*float32)(nil)).Elem())
|
||||
}
|
||||
return &float32Codec{}
|
||||
case reflect.Float64:
|
||||
if typeName != "float64" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*float64)(nil)).Elem())
|
||||
}
|
||||
return &float64Codec{}
|
||||
case reflect.Bool:
|
||||
if typeName != "bool" {
|
||||
return encoderOfType(cfg, prefix, reflect.TypeOf((*bool)(nil)).Elem())
|
||||
}
|
||||
return &boolCodec{}
|
||||
case reflect.Interface:
|
||||
return &dynamicEncoder{reflect2.Type2(typ)}
|
||||
case reflect.Struct:
|
||||
return encoderOfStruct(cfg, prefix, typ)
|
||||
case reflect.Array:
|
||||
return encoderOfArray(cfg, prefix, typ)
|
||||
case reflect.Slice:
|
||||
return encoderOfSlice(cfg, prefix, typ)
|
||||
case reflect.Map:
|
||||
return encoderOfMap(cfg, prefix, typ)
|
||||
case reflect.Ptr:
|
||||
return encoderOfOptional(cfg, prefix, typ)
|
||||
default:
|
||||
return &lazyErrorEncoder{err: fmt.Errorf("%s%s is unsupported type", prefix, typ.String())}
|
||||
}
|
||||
}
|
||||
|
||||
type placeholderDecoder struct {
|
||||
cfg *frozenConfig
|
||||
cacheKey reflect.Type
|
||||
}
|
||||
|
||||
func (decoder *placeholderDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
|
||||
for i := 0; i < 500; i++ {
|
||||
realDecoder := decoder.cfg.getDecoderFromCache(decoder.cacheKey)
|
||||
_, isPlaceholder := realDecoder.(*placeholderDecoder)
|
||||
if isPlaceholder {
|
||||
time.Sleep(10 * time.Millisecond)
|
||||
} else {
|
||||
realDecoder.Decode(ptr, iter)
|
||||
return
|
||||
}
|
||||
}
|
||||
panic(fmt.Sprintf("real decoder not found for cache key: %v", decoder.cacheKey))
|
||||
}
|
||||
|
||||
type lazyErrorDecoder struct {
|
||||
err error
|
||||
}
|
||||
|
||||
func (decoder *lazyErrorDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
|
||||
if iter.WhatIsNext() != NilValue {
|
||||
if iter.Error == nil {
|
||||
iter.Error = decoder.err
|
||||
}
|
||||
} else {
|
||||
iter.Skip()
|
||||
}
|
||||
}
|
||||
|
||||
type lazyErrorEncoder struct {
|
||||
err error
|
||||
}
|
||||
|
||||
func (encoder *lazyErrorEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
|
||||
if ptr == nil {
|
||||
stream.WriteNil()
|
||||
} else if stream.Error == nil {
|
||||
stream.Error = encoder.err
|
||||
}
|
||||
}
|
||||
|
||||
func (encoder *lazyErrorEncoder) IsEmpty(ptr unsafe.Pointer) bool {
|
||||
return false
|
||||
}
|
||||
|
||||
func extractInterface(val interface{}) emptyInterface {
|
||||
return *((*emptyInterface)(unsafe.Pointer(&val)))
|
||||
}
|
||||
|
||||
// emptyInterface is the header for an interface{} value.
|
||||
type emptyInterface struct {
|
||||
typ unsafe.Pointer
|
||||
word unsafe.Pointer
|
||||
}
|
||||
|
||||
// emptyInterface is the header for an interface with method (not interface{})
|
||||
type nonEmptyInterface struct {
|
||||
// see ../runtime/iface.go:/Itab
|
||||
itab *struct {
|
||||
ityp unsafe.Pointer // static interface type
|
||||
typ unsafe.Pointer // dynamic concrete type
|
||||
link unsafe.Pointer
|
||||
bad int32
|
||||
unused int32
|
||||
fun [100000]unsafe.Pointer // method table
|
||||
}
|
||||
word unsafe.Pointer
|
||||
}
|
||||
Reference in New Issue
Block a user