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reflect.go
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reflect.go
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package codec
import (
"reflect"
"runtime"
"unsafe"
)
const maskFlagRO = ^uintptr(96)
var flagOffset uintptr
var hasFlagField bool
var serializableInterfaceType = reflect.TypeOf((*Serializable)(nil)).Elem()
func determineReflectValueFlagOffset() {
if field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag"); ok {
flagOffset = field.Offset
hasFlagField = true
} else {
hasFlagField = false
}
}
func setValue(oldValue reflect.Value, newValue reflect.Value) {
if hasFlagField {
flag := (*uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&newValue)) + flagOffset))
*flag &= maskFlagRO
}
oldValue.Set(newValue)
}
func changeValue(value reflect.Value, newValue any) {
value.Set(reflect.ValueOf(newValue).Convert(value.Type()))
}
func isSerializable(v reflect.Value) bool {
if v.IsValid() {
t := v.Type()
if isPointer(t) {
if isCommonType(t.Elem()) {
return false
}
} else if isCommonType(t) {
return false
}
return t.Implements(serializableInterfaceType)
}
return false
}
func isPointer(t reflect.Type) bool {
return t.Kind() == reflect.Pointer
}
func isSimplePointer(t reflect.Type) bool {
return isPointer(t) && isCommonType(t)
}
func isCommonType(t reflect.Type) bool {
name := t.Name()
if name == "" {
return true
}
if name == t.Kind().String() {
return true
}
if t.Kind() == reflect.UnsafePointer && name == "Pointer" {
return true
}
return false
}
func funcName(f reflect.Value) string {
if f.Kind() != reflect.Func {
return ""
}
return runtime.FuncForPC(f.Pointer()).Name()
}