1// Protocol Buffers for Go with Gadgets 2// 3// Copyright (c) 2018, The GoGo Authors. All rights reserved. 4// http://github.com/gogo/protobuf 5// 6// Redistribution and use in source and binary forms, with or without 7// modification, are permitted provided that the following conditions are 8// met: 9// 10// * Redistributions of source code must retain the above copyright 11// notice, this list of conditions and the following disclaimer. 12// * Redistributions in binary form must reproduce the above 13// copyright notice, this list of conditions and the following disclaimer 14// in the documentation and/or other materials provided with the 15// distribution. 16// 17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29// +build purego appengine js 30 31// This file contains an implementation of proto field accesses using package reflect. 32// It is slower than the code in pointer_unsafe.go but it avoids package unsafe and can 33// be used on App Engine. 34 35package proto 36 37import ( 38 "reflect" 39) 40 41// TODO: untested, so probably incorrect. 42 43func (p pointer) getRef() pointer { 44 return pointer{v: p.v.Addr()} 45} 46 47func (p pointer) appendRef(v pointer, typ reflect.Type) { 48 slice := p.getSlice(typ) 49 elem := v.asPointerTo(typ).Elem() 50 newSlice := reflect.Append(slice, elem) 51 slice.Set(newSlice) 52} 53 54func (p pointer) getSlice(typ reflect.Type) reflect.Value { 55 sliceTyp := reflect.SliceOf(typ) 56 slice := p.asPointerTo(sliceTyp) 57 slice = slice.Elem() 58 return slice 59} 60