| Pragya Arya | 324337e | 2020-02-20 14:35:08 +0530 | [diff] [blame^] | 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. |
| 4 | |
| 5 | // +build !purego |
| 6 | |
| 7 | package cmp |
| 8 | |
| 9 | import ( |
| 10 | "reflect" |
| 11 | "unsafe" |
| 12 | ) |
| 13 | |
| 14 | const supportExporters = true |
| 15 | |
| 16 | // retrieveUnexportedField uses unsafe to forcibly retrieve any field from |
| 17 | // a struct such that the value has read-write permissions. |
| 18 | // |
| 19 | // The parent struct, v, must be addressable, while f must be a StructField |
| 20 | // describing the field to retrieve. |
| 21 | func retrieveUnexportedField(v reflect.Value, f reflect.StructField) reflect.Value { |
| 22 | // See https://github.com/google/go-cmp/issues/167 for discussion of the |
| 23 | // following expression. |
| 24 | return reflect.NewAt(f.Type, unsafe.Pointer(uintptr(unsafe.Pointer(v.UnsafeAddr()))+f.Offset)).Elem() |
| 25 | } |