1 // Copyright 2017, The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE.md file.
14 const supportExporters = true
16 // retrieveUnexportedField uses unsafe to forcibly retrieve any field from
17 // a struct such that the value has read-write permissions.
19 // The parent struct, v, must be addressable, while f must be a StructField
20 // describing the field to retrieve. If addr is false,
21 // then the returned value will be shallowed copied to be non-addressable.
22 func retrieveUnexportedField(v reflect.Value, f reflect.StructField, addr bool) reflect.Value {
23 ve := reflect.NewAt(f.Type, unsafe.Pointer(uintptr(unsafe.Pointer(v.UnsafeAddr()))+f.Offset)).Elem()
25 // A field is addressable if and only if the struct is addressable.
26 // If the original parent value was not addressable, shallow copy the
27 // value to make it non-addressable to avoid leaking an implementation
28 // detail of how forcibly exporting a field works.
29 if ve.Kind() == reflect.Interface && ve.IsNil() {
30 return reflect.Zero(f.Type)
32 return reflect.ValueOf(ve.Interface()).Convert(f.Type)