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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found at https://go.dev/LICENSE.
package sysenc
import (
"reflect"
"sync"
)
var hasUnexportedFieldsCache sync.Map // map[reflect.Type]bool
func hasUnexportedFields(typ reflect.Type) bool {
switch typ.Kind() {
case reflect.Slice, reflect.Array, reflect.Pointer:
return hasUnexportedFields(typ.Elem())
case reflect.Struct:
if unexported, ok := hasUnexportedFieldsCache.Load(typ); ok {
return unexported.(bool)
}
unexported := false
for i, n := 0, typ.NumField(); i < n; i++ {
field := typ.Field(i)
// Package binary allows _ fields but always writes zeroes into them.
if (!field.IsExported() && field.Name != "_") || hasUnexportedFields(field.Type) {
unexported = true
break
}
}
hasUnexportedFieldsCache.Store(typ, unexported)
return unexported
default:
// NB: It's not clear what this means for Chan and so on.
return false
}
}
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