SafeInterface.h revision 81ea3efb75a6427c946221f95dcf9c388b27a977
1d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza/* 2d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * Copyright 2016 The Android Open Source Project 3d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * 4d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * Licensed under the Apache License, Version 2.0 (the "License"); 5d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * you may not use this file except in compliance with the License. 6d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * You may obtain a copy of the License at 7d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * 8d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * http://www.apache.org/licenses/LICENSE-2.0 9d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * 10d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * Unless required by applicable law or agreed to in writing, software 11d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * distributed under the License is distributed on an "AS IS" BASIS, 12d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * See the License for the specific language governing permissions and 14d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza * limitations under the License. 15d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza */ 16d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 17d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#pragma once 18d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 19d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#include <binder/IInterface.h> 20d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#include <binder/Parcel.h> 21d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#include <cutils/compiler.h> 22d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 23d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza// Set to 1 to enable CallStacks when logging errors 24d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#define SI_DUMP_CALLSTACKS 0 25d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#if SI_DUMP_CALLSTACKS 26d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#include <utils/CallStack.h> 27d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#endif 28d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 29d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#include <functional> 30d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#include <type_traits> 31d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 32d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozanamespace android { 33d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozanamespace SafeInterface { 34d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 35d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza// ParcelHandler is responsible for writing/reading various types to/from a Parcel in a generic way 36d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozaclass ParcelHandler { 37d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozapublic: 38d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza explicit ParcelHandler(const char* logTag) : mLogTag(logTag) {} 39d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 40d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Specializations for types with dedicated handling in Parcel 41d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t read(const Parcel& parcel, bool* b) const { 42d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("readBool", [&]() { return parcel.readBool(b); }); 43d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 44d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t write(Parcel* parcel, bool b) const { 45d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("writeBool", [&]() { return parcel->writeBool(b); }); 46d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 4781ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza template <typename E> 4881ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza typename std::enable_if<std::is_enum<E>::value, status_t>::type read(const Parcel& parcel, 4981ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza E* e) const { 5081ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza typename std::underlying_type<E>::type u{}; 5181ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza status_t result = read(parcel, &u); 5281ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza *e = static_cast<E>(u); 5381ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza return result; 5481ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza } 5581ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza template <typename E> 5681ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza typename std::enable_if<std::is_enum<E>::value, status_t>::type write(Parcel* parcel, 5781ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza E e) const { 5881ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza return write(parcel, static_cast<typename std::underlying_type<E>::type>(e)); 5981ea3efb75a6427c946221f95dcf9c388b27a977Dan Stoza } 60d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 61df614ae850b0b277030f94fd32062d45e723f91bDan Stoza typename std::enable_if<std::is_base_of<Flattenable<T>, T>::value, status_t>::type read( 62df614ae850b0b277030f94fd32062d45e723f91bDan Stoza const Parcel& parcel, T* t) const { 63df614ae850b0b277030f94fd32062d45e723f91bDan Stoza return callParcel("read(Flattenable)", [&]() { return parcel.read(*t); }); 64df614ae850b0b277030f94fd32062d45e723f91bDan Stoza } 65df614ae850b0b277030f94fd32062d45e723f91bDan Stoza template <typename T> 66df614ae850b0b277030f94fd32062d45e723f91bDan Stoza typename std::enable_if<std::is_base_of<Flattenable<T>, T>::value, status_t>::type write( 67df614ae850b0b277030f94fd32062d45e723f91bDan Stoza Parcel* parcel, const T& t) const { 68df614ae850b0b277030f94fd32062d45e723f91bDan Stoza return callParcel("write(Flattenable)", [&]() { return parcel->write(t); }); 69df614ae850b0b277030f94fd32062d45e723f91bDan Stoza } 70df614ae850b0b277030f94fd32062d45e723f91bDan Stoza template <typename T> 716dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza typename std::enable_if<std::is_base_of<Flattenable<T>, T>::value, status_t>::type read( 726dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza const Parcel& parcel, sp<T>* t) const { 736dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza *t = new T{}; 746dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza return callParcel("read(sp<Flattenable>)", [&]() { return parcel.read(*(t->get())); }); 756dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza } 766dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza template <typename T> 776dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza typename std::enable_if<std::is_base_of<Flattenable<T>, T>::value, status_t>::type write( 786dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza Parcel* parcel, const sp<T>& t) const { 796dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza return callParcel("write(sp<Flattenable>)", [&]() { return parcel->write(*(t.get())); }); 806dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza } 816dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza template <typename T> 82d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<std::is_base_of<LightFlattenable<T>, T>::value, status_t>::type read( 83d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const Parcel& parcel, T* t) const { 84d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("read(LightFlattenable)", [&]() { return parcel.read(*t); }); 85d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 86d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 87d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<std::is_base_of<LightFlattenable<T>, T>::value, status_t>::type write( 88d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel* parcel, const T& t) const { 89d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("write(LightFlattenable)", [&]() { return parcel->write(t); }); 90d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 91d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 92d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<std::is_base_of<Parcelable, T>::value, status_t>::type read( 93d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const Parcel& parcel, T* t) const { 94d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("readParcelable", [&]() { return parcel.readParcelable(t); }); 95d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 96d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 97d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<std::is_base_of<Parcelable, T>::value, status_t>::type write( 98d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel* parcel, const T& t) const { 99d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("writeParcelable", [&]() { return parcel->writeParcelable(t); }); 100d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 101d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t read(const Parcel& parcel, String8* str) const { 102d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("readString8", [&]() { return parcel.readString8(str); }); 103d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 104d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t write(Parcel* parcel, const String8& str) const { 105d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("writeString8", [&]() { return parcel->writeString8(str); }); 106d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 107d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 1086dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza typename std::enable_if<std::is_same<IBinder, T>::value, status_t>::type read( 1096dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza const Parcel& parcel, sp<T>* pointer) const { 110d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("readNullableStrongBinder", 111d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza [&]() { return parcel.readNullableStrongBinder(pointer); }); 112d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 113d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 114d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<std::is_same<IBinder, T>::value, status_t>::type write( 115d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel* parcel, const sp<T>& pointer) const { 116d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callParcel("writeStrongBinder", 117d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza [&]() { return parcel->writeStrongBinder(pointer); }); 118d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 119d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 1206dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza typename std::enable_if<std::is_base_of<IInterface, T>::value, status_t>::type read( 1216dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza const Parcel& parcel, sp<T>* pointer) const { 1226dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza return callParcel("readNullableStrongBinder[IInterface]", 1236dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza [&]() { return parcel.readNullableStrongBinder(pointer); }); 1246dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza } 1256dd325b9396c9946ced9d01665152a44167a8fa2Dan Stoza template <typename T> 126d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<std::is_base_of<IInterface, T>::value, status_t>::type write( 127d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel* parcel, const sp<T>& interface) const { 128d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return write(parcel, IInterface::asBinder(interface)); 129d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 130d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 131d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Templates to handle integral types. We use a struct template to require that the called 132d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // function exactly matches the signedness and size of the argument (e.g., the argument isn't 133d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // silently widened). 134d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <bool isSigned, size_t size, typename I> 135d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct HandleInt; 136d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename I> 137d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct HandleInt<true, 4, I> { 138d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static status_t read(const ParcelHandler& handler, const Parcel& parcel, I* i) { 139d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return handler.callParcel("readInt32", [&]() { return parcel.readInt32(i); }); 140d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 141d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static status_t write(const ParcelHandler& handler, Parcel* parcel, I i) { 142d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return handler.callParcel("writeInt32", [&]() { return parcel->writeInt32(i); }); 143d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 144d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 145d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename I> 146d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct HandleInt<false, 4, I> { 147d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static status_t read(const ParcelHandler& handler, const Parcel& parcel, I* i) { 148d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return handler.callParcel("readUint32", [&]() { return parcel.readUint32(i); }); 149d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 150d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static status_t write(const ParcelHandler& handler, Parcel* parcel, I i) { 151d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return handler.callParcel("writeUint32", [&]() { return parcel->writeUint32(i); }); 152d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 153d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 154d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename I> 155662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza struct HandleInt<true, 8, I> { 156662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza static status_t read(const ParcelHandler& handler, const Parcel& parcel, I* i) { 157662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza return handler.callParcel("readInt64", [&]() { return parcel.readInt64(i); }); 158662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza } 159662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza static status_t write(const ParcelHandler& handler, Parcel* parcel, I i) { 160662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza return handler.callParcel("writeInt64", [&]() { return parcel->writeInt64(i); }); 161662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza } 162662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza }; 163662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza template <typename I> 164662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza struct HandleInt<false, 8, I> { 165662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza static status_t read(const ParcelHandler& handler, const Parcel& parcel, I* i) { 166662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza return handler.callParcel("readUint64", [&]() { return parcel.readUint64(i); }); 167662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza } 168662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza static status_t write(const ParcelHandler& handler, Parcel* parcel, I i) { 169662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza return handler.callParcel("writeUint64", [&]() { return parcel->writeUint64(i); }); 170662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza } 171662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza }; 172662a899ed9bb727c1267ec10d24d87a2f0be3355Dan Stoza template <typename I> 173d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<std::is_integral<I>::value, status_t>::type read(const Parcel& parcel, 174d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza I* i) const { 175d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return HandleInt<std::is_signed<I>::value, sizeof(I), I>::read(*this, parcel, i); 176d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 177d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename I> 178d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<std::is_integral<I>::value, status_t>::type write(Parcel* parcel, 179d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza I i) const { 180d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return HandleInt<std::is_signed<I>::value, sizeof(I), I>::write(*this, parcel, i); 181d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 182d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 183d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozaprivate: 184d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const char* const mLogTag; 185d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 186d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Helper to encapsulate error handling while calling the various Parcel methods 187d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Function> 188d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t callParcel(const char* name, Function f) const { 189d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = f(); 190d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 191d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza ALOG(LOG_ERROR, mLogTag, "Failed to %s, (%d: %s)", name, error, strerror(-error)); 192d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#if SI_DUMP_CALLSTACKS 193d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza CallStack callStack(mLogTag); 194d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#endif 195d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 196d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 197d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 198d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza}; 199d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 200d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza// Utility struct template which allows us to retrieve the types of the parameters of a member 201d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza// function pointer 202d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozatemplate <typename T> 203d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozastruct ParamExtractor; 204d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozatemplate <typename Class, typename Return, typename... Params> 205d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozastruct ParamExtractor<Return (Class::*)(Params...)> { 206d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using ParamTuple = std::tuple<Params...>; 207d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza}; 208d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozatemplate <typename Class, typename Return, typename... Params> 209d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozastruct ParamExtractor<Return (Class::*)(Params...) const> { 210d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using ParamTuple = std::tuple<Params...>; 211d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza}; 212d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 213d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza} // namespace SafeInterface 214d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 215d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozatemplate <typename Interface> 216d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozaclass SafeBpInterface : public BpInterface<Interface> { 217d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozaprotected: 218d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza SafeBpInterface(const sp<IBinder>& impl, const char* logTag) 219d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza : BpInterface<Interface>(impl), mLogTag(logTag) {} 220d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza ~SafeBpInterface() override = default; 221d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 222d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // callRemote is used to invoke a synchronous procedure call over Binder 223d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Method, typename TagType, typename... Args> 224d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t callRemote(TagType tag, Args&&... args) const { 225d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static_assert(sizeof(TagType) <= sizeof(uint32_t), "Tag must fit inside uint32_t"); 226d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 227d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Verify that the arguments are compatible with the parameters 228d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using ParamTuple = typename SafeInterface::ParamExtractor<Method>::ParamTuple; 229d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static_assert(ArgsMatchParams<std::tuple<Args...>, ParamTuple>::value, 230d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza "Invalid argument type"); 231d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 232d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Write the input arguments to the data Parcel 233d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel data; 234d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza data.writeInterfaceToken(this->getInterfaceDescriptor()); 235d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 236d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = writeInputs(&data, std::forward<Args>(args)...); 237d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 238d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged by writeInputs 239d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 240d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 241d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 242d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Send the data Parcel to the remote and retrieve the reply parcel 243d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel reply; 244d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza error = this->remote()->transact(static_cast<uint32_t>(tag), data, &reply); 245d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 246d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza ALOG(LOG_ERROR, mLogTag, "Failed to transact (%d)", error); 247d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#if SI_DUMP_CALLSTACKS 248d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza CallStack callStack(mLogTag); 249d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#endif 250d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 251d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 252d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 253d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Read the outputs from the reply Parcel into the output arguments 254d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza error = readOutputs(reply, std::forward<Args>(args)...); 255d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 256d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged by readOutputs 257d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 258d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 259d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 260d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Retrieve the result code from the reply Parcel 261d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t result = NO_ERROR; 262d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza error = reply.readInt32(&result); 263d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 264d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza ALOG(LOG_ERROR, mLogTag, "Failed to obtain result"); 265d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#if SI_DUMP_CALLSTACKS 266d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza CallStack callStack(mLogTag); 267d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#endif 268d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 269d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 270d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return result; 271d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 272d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 273d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // callRemoteAsync is used to invoke an asynchronous procedure call over Binder 274d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Method, typename TagType, typename... Args> 275d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza void callRemoteAsync(TagType tag, Args&&... args) const { 276d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static_assert(sizeof(TagType) <= sizeof(uint32_t), "Tag must fit inside uint32_t"); 277d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 278d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Verify that the arguments are compatible with the parameters 279d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using ParamTuple = typename SafeInterface::ParamExtractor<Method>::ParamTuple; 280d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static_assert(ArgsMatchParams<std::tuple<Args...>, ParamTuple>::value, 281d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza "Invalid argument type"); 282d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 283d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Write the input arguments to the data Parcel 284d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel data; 285d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza data.writeInterfaceToken(this->getInterfaceDescriptor()); 286d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = writeInputs(&data, std::forward<Args>(args)...); 287d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 288d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged by writeInputs 289d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return; 290d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 291d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 292d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // There will be no data in the reply Parcel since the call is one-way 293d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel reply; 294d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza error = this->remote()->transact(static_cast<uint32_t>(tag), data, &reply, 295d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza IBinder::FLAG_ONEWAY); 296d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 297d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza ALOG(LOG_ERROR, mLogTag, "Failed to transact (%d)", error); 298d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#if SI_DUMP_CALLSTACKS 299d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza CallStack callStack(mLogTag); 300d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#endif 301d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 302d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 303d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 304d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozaprivate: 305d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const char* const mLogTag; 306d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 307d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // This struct provides information on whether the decayed types of the elements at Index in the 308d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // tuple types T and U (that is, the types after stripping cv-qualifiers, removing references, 309d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // and a few other less common operations) are the same 310d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <size_t Index, typename T, typename U> 311d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct DecayedElementsMatch { 312d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza private: 313d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using FirstT = typename std::tuple_element<Index, T>::type; 314d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using DecayedT = typename std::decay<FirstT>::type; 315d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using FirstU = typename std::tuple_element<Index, U>::type; 316d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using DecayedU = typename std::decay<FirstU>::type; 317d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 318d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza public: 319d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static constexpr bool value = std::is_same<DecayedT, DecayedU>::value; 320d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 321d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 322d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // When comparing whether the argument types match the parameter types, we first decay them (see 323d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // DecayedElementsMatch) to avoid falsely flagging, say, T&& against T even though they are 324d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // equivalent enough for our purposes 325d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T, typename U> 326d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct ArgsMatchParams {}; 327d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename... Args, typename... Params> 328d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct ArgsMatchParams<std::tuple<Args...>, std::tuple<Params...>> { 329d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static_assert(sizeof...(Args) <= sizeof...(Params), "Too many arguments"); 330d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static_assert(sizeof...(Args) >= sizeof...(Params), "Not enough arguments"); 331d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 332d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza private: 333d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <size_t Index> 334d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static constexpr typename std::enable_if<(Index < sizeof...(Args)), bool>::type 335d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza elementsMatch() { 336d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (!DecayedElementsMatch<Index, std::tuple<Args...>, std::tuple<Params...>>::value) { 337d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return false; 338d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 339d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return elementsMatch<Index + 1>(); 340d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 341d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <size_t Index> 342d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static constexpr typename std::enable_if<(Index >= sizeof...(Args)), bool>::type 343d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza elementsMatch() { 344d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return true; 345d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 346d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 347d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza public: 348d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static constexpr bool value = elementsMatch<0>(); 349d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 350d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 351d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Since we assume that pointer arguments are outputs, we can use this template struct to 352d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // determine whether or not a given argument is fundamentally a pointer type and thus an output 353d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 354d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct IsPointerIfDecayed { 355d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza private: 356d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using Decayed = typename std::decay<T>::type; 357d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 358d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza public: 359d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static constexpr bool value = std::is_pointer<Decayed>::value; 360d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 361d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 362d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 363d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<!IsPointerIfDecayed<T>::value, status_t>::type writeIfInput( 364d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel* data, T&& t) const { 365d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return SafeInterface::ParcelHandler{mLogTag}.write(data, std::forward<T>(t)); 366d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 367d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 368d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<IsPointerIfDecayed<T>::value, status_t>::type writeIfInput( 369d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel* /*data*/, T&& /*t*/) const { 370d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return NO_ERROR; 371d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 372d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 373d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // This method iterates through all of the arguments, writing them to the data Parcel if they 374d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // are an input (i.e., if they are not a pointer type) 375d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T, typename... Remaining> 376d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t writeInputs(Parcel* data, T&& t, Remaining&&... remaining) const { 377d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = writeIfInput(data, std::forward<T>(t)); 378d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 379d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged by writeIfInput 380d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 381d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 382d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return writeInputs(data, std::forward<Remaining>(remaining)...); 383d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 384d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static status_t writeInputs(Parcel* /*data*/) { return NO_ERROR; } 385d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 386d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 387d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<IsPointerIfDecayed<T>::value, status_t>::type readIfOutput( 388d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const Parcel& reply, T&& t) const { 389d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return SafeInterface::ParcelHandler{mLogTag}.read(reply, std::forward<T>(t)); 390d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 391d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T> 392d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static typename std::enable_if<!IsPointerIfDecayed<T>::value, status_t>::type readIfOutput( 393d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const Parcel& /*reply*/, T&& /*t*/) { 394d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return NO_ERROR; 395d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 396d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 397d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Similar to writeInputs except that it reads output arguments from the reply Parcel 398d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T, typename... Remaining> 399d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t readOutputs(const Parcel& reply, T&& t, Remaining&&... remaining) const { 400d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = readIfOutput(reply, std::forward<T>(t)); 401d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 402d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged by readIfOutput 403d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 404d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 405d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return readOutputs(reply, std::forward<Remaining>(remaining)...); 406d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 407d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static status_t readOutputs(const Parcel& /*data*/) { return NO_ERROR; } 408d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza}; 409d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 410d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozatemplate <typename Interface> 411d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozaclass SafeBnInterface : public BnInterface<Interface> { 412d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozapublic: 413d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza explicit SafeBnInterface(const char* logTag) : mLogTag(logTag) {} 414d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 415d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozaprotected: 416d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Method> 417d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t callLocal(const Parcel& data, Parcel* reply, Method method) { 418d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza CHECK_INTERFACE(this, data, reply); 419d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 420d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Since we need to both pass inputs into the call as well as retrieve outputs, we create a 421d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // "raw" tuple, where the inputs are interleaved with actual, non-pointer versions of the 422d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // outputs. When we ultimately call into the method, we will pass the addresses of the 423d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // output arguments instead of their tuple members directly, but the storage will live in 424d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // the tuple. 425d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using ParamTuple = typename SafeInterface::ParamExtractor<Method>::ParamTuple; 426d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename RawConverter<std::tuple<>, ParamTuple>::type rawArgs{}; 427d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 428d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Read the inputs from the data Parcel into the argument tuple 429d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = InputReader<ParamTuple>{mLogTag}.readInputs(data, &rawArgs); 430d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 431d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged by read 432d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 433d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 434d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 435d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Call the local method 436d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t result = MethodCaller<ParamTuple>::call(this, method, &rawArgs); 437d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 438d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Extract the outputs from the argument tuple and write them into the reply Parcel 439d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza error = OutputWriter<ParamTuple>{mLogTag}.writeOutputs(reply, &rawArgs); 440d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 441d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged by write 442d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 443d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 444d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 445d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Return the result code in the reply Parcel 446d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza error = reply->writeInt32(result); 447d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 448d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza ALOG(LOG_ERROR, mLogTag, "Failed to write result"); 449d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#if SI_DUMP_CALLSTACKS 450d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza CallStack callStack(mLogTag); 451d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza#endif 452d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 453d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 454d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return NO_ERROR; 455d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 456d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 457d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Method> 458d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t callLocalAsync(const Parcel& data, Parcel* /*reply*/, Method method) { 459d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // reply is not actually used by CHECK_INTERFACE 460d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza CHECK_INTERFACE(this, data, reply); 461d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 462d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Since we need to both pass inputs into the call as well as retrieve outputs, we create a 463d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // "raw" tuple, where the inputs are interleaved with actual, non-pointer versions of the 464d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // outputs. When we ultimately call into the method, we will pass the addresses of the 465d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // output arguments instead of their tuple members directly, but the storage will live in 466d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // the tuple. 467d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using ParamTuple = typename SafeInterface::ParamExtractor<Method>::ParamTuple; 468d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename RawConverter<std::tuple<>, ParamTuple>::type rawArgs{}; 469d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 470d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Read the inputs from the data Parcel into the argument tuple 471d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = InputReader<ParamTuple>{mLogTag}.readInputs(data, &rawArgs); 472d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 473d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged by read 474d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 475d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 476d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 477d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Call the local method 478d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza MethodCaller<ParamTuple>::callVoid(this, method, &rawArgs); 479d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 480d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // After calling, there is nothing more to do since asynchronous calls do not return a value 481d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // to the caller 482d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return NO_ERROR; 483d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 484d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 485d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stozaprivate: 486d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const char* const mLogTag; 487d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 488d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // RemoveFirst strips the first element from a tuple. 489d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // For example, given T = std::tuple<A, B, C>, RemoveFirst<T>::type = std::tuple<B, C> 490d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T, typename... Args> 491d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct RemoveFirst; 492d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename T, typename... Args> 493d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct RemoveFirst<std::tuple<T, Args...>> { 494d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using type = std::tuple<Args...>; 495d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 496d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 497d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // RawConverter strips a tuple down to its fundamental types, discarding both pointers and 498d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // references. This allows us to allocate storage for both input (non-pointer) arguments and 499d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // output (pointer) arguments in one tuple. 500d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // For example, given T = std::tuple<const A&, B*>, RawConverter<T>::type = std::tuple<A, B> 501d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Unconverted, typename... Converted> 502d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct RawConverter; 503d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Unconverted, typename... Converted> 504d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct RawConverter<std::tuple<Converted...>, Unconverted> { 505d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza private: 506d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using ElementType = typename std::tuple_element<0, Unconverted>::type; 507d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using Decayed = typename std::decay<ElementType>::type; 508d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using WithoutPointer = typename std::remove_pointer<Decayed>::type; 509d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 510d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza public: 511d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using type = typename RawConverter<std::tuple<Converted..., WithoutPointer>, 512d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename RemoveFirst<Unconverted>::type>::type; 513d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 514d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename... Converted> 515d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct RawConverter<std::tuple<Converted...>, std::tuple<>> { 516d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using type = std::tuple<Converted...>; 517d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 518d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 519d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // This provides a simple way to determine whether the indexed element of Args... is a pointer 520d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <size_t I, typename... Args> 521d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct ElementIsPointer { 522d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza private: 523d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza using ElementType = typename std::tuple_element<I, std::tuple<Args...>>::type; 524d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 525d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza public: 526d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static constexpr bool value = std::is_pointer<ElementType>::value; 527d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 528d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 529d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // This class iterates over the parameter types, and if a given parameter is an input 530d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // (i.e., is not a pointer), reads the corresponding argument tuple element from the data Parcel 531d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename... Params> 532d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza class InputReader; 533d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename... Params> 534d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza class InputReader<std::tuple<Params...>> { 535d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza public: 536d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza explicit InputReader(const char* logTag) : mLogTag(logTag) {} 537d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 538d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Note that in this case (as opposed to in SafeBpInterface), we iterate using an explicit 539d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // index (starting with 0 here) instead of using recursion and stripping the first element. 540d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // This is because in SafeBpInterface we aren't actually operating on a real tuple, but are 541d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // instead just using a tuple as a convenient container for variadic types, whereas here we 542d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // can't modify the argument tuple without causing unnecessary copies or moves of the data 543d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // contained therein. 544d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename RawTuple> 545d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t readInputs(const Parcel& data, RawTuple* args) { 546d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return dispatchArg<0>(data, args); 547d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 548d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 549d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza private: 550d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const char* const mLogTag; 551d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 552d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <std::size_t I, typename RawTuple> 553d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<!ElementIsPointer<I, Params...>::value, status_t>::type readIfInput( 554d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const Parcel& data, RawTuple* args) { 555d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return SafeInterface::ParcelHandler{mLogTag}.read(data, &std::get<I>(*args)); 556d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 557d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <std::size_t I, typename RawTuple> 558d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<ElementIsPointer<I, Params...>::value, status_t>::type readIfInput( 559d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const Parcel& /*data*/, RawTuple* /*args*/) { 560d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return NO_ERROR; 561d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 562d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 563d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Recursively iterate through the arguments 564d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <std::size_t I, typename RawTuple> 565d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<(I < sizeof...(Params)), status_t>::type dispatchArg( 566d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const Parcel& data, RawTuple* args) { 567d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = readIfInput<I>(data, args); 568d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 569d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged in read 570d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 571d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 572d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return dispatchArg<I + 1>(data, args); 573d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 574d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <std::size_t I, typename RawTuple> 575d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<(I >= sizeof...(Params)), status_t>::type dispatchArg( 576d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const Parcel& /*data*/, RawTuple* /*args*/) { 577d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return NO_ERROR; 578d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 579d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 580d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 581d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // getForCall uses the types of the parameters to determine whether a given element of the 582d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // argument tuple is an input, which should be passed directly into the call, or an output, for 583d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // which its address should be passed into the call 584d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <size_t I, typename RawTuple, typename... Params> 585d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static typename std::enable_if< 586d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza ElementIsPointer<I, Params...>::value, 587d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::tuple_element<I, std::tuple<Params...>>::type>::type 588d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza getForCall(RawTuple* args) { 589d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return &std::get<I>(*args); 590d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 591d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <size_t I, typename RawTuple, typename... Params> 592d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static typename std::enable_if< 593d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza !ElementIsPointer<I, Params...>::value, 594d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::tuple_element<I, std::tuple<Params...>>::type>::type& 595d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza getForCall(RawTuple* args) { 596d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return std::get<I>(*args); 597d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 598d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 599d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // This template class uses std::index_sequence and parameter pack expansion to call the given 600d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // method using the elements of the argument tuple (after those arguments are passed through 601d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // getForCall to get addresses instead of values for output arguments) 602d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename... Params> 603d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct MethodCaller; 604d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename... Params> 605d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct MethodCaller<std::tuple<Params...>> { 606d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza public: 607d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // The calls through these to the helper methods are necessary to generate the 608d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // std::index_sequences used to unpack the argument tuple into the method call 609d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Class, typename MemberFunction, typename RawTuple> 610d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static status_t call(Class* instance, MemberFunction function, RawTuple* args) { 611d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return callHelper(instance, function, args, std::index_sequence_for<Params...>{}); 612d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 613d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Class, typename MemberFunction, typename RawTuple> 614d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static void callVoid(Class* instance, MemberFunction function, RawTuple* args) { 615d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza callVoidHelper(instance, function, args, std::index_sequence_for<Params...>{}); 616d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 617d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 618d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza private: 619d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Class, typename MemberFunction, typename RawTuple, std::size_t... I> 620d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static status_t callHelper(Class* instance, MemberFunction function, RawTuple* args, 621d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza std::index_sequence<I...> /*unused*/) { 622d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return (instance->*function)(getForCall<I, RawTuple, Params...>(args)...); 623d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 624d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename Class, typename MemberFunction, typename RawTuple, std::size_t... I> 625d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza static void callVoidHelper(Class* instance, MemberFunction function, RawTuple* args, 626d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza std::index_sequence<I...> /*unused*/) { 627d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza (instance->*function)(getForCall<I, RawTuple, Params...>(args)...); 628d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 629d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 630d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 631d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // This class iterates over the parameter types, and if a given parameter is an output 632d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // (i.e., is a pointer), writes the corresponding argument tuple element into the reply Parcel 633d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename... Params> 634d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct OutputWriter; 635d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename... Params> 636d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza struct OutputWriter<std::tuple<Params...>> { 637d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza public: 638d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza explicit OutputWriter(const char* logTag) : mLogTag(logTag) {} 639d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 640d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // See the note on InputReader::readInputs for why this differs from the arguably simpler 641d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // RemoveFirst approach in SafeBpInterface 642d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <typename RawTuple> 643d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t writeOutputs(Parcel* reply, RawTuple* args) { 644d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return dispatchArg<0>(reply, args); 645d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 646d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 647d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza private: 648d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza const char* const mLogTag; 649d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 650d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <std::size_t I, typename RawTuple> 651d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<ElementIsPointer<I, Params...>::value, status_t>::type 652d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza writeIfOutput(Parcel* reply, RawTuple* args) { 653d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return SafeInterface::ParcelHandler{mLogTag}.write(reply, std::get<I>(*args)); 654d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 655d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <std::size_t I, typename RawTuple> 656d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<!ElementIsPointer<I, Params...>::value, status_t>::type 657d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza writeIfOutput(Parcel* /*reply*/, RawTuple* /*args*/) { 658d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return NO_ERROR; 659d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 660d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 661d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // Recursively iterate through the arguments 662d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <std::size_t I, typename RawTuple> 663d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<(I < sizeof...(Params)), status_t>::type dispatchArg( 664d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel* reply, RawTuple* args) { 665d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza status_t error = writeIfOutput<I>(reply, args); 666d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza if (CC_UNLIKELY(error != NO_ERROR)) { 667d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza // A message will have been logged in read 668d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return error; 669d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 670d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return dispatchArg<I + 1>(reply, args); 671d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 672d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza template <std::size_t I, typename RawTuple> 673d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza typename std::enable_if<(I >= sizeof...(Params)), status_t>::type dispatchArg( 674d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza Parcel* /*reply*/, RawTuple* /*args*/) { 675d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza return NO_ERROR; 676d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza } 677d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza }; 678d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza}; 679d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza 680d630e520de9ff4bc50723a7e8f91b6d9be27db1cDan Stoza} // namespace android 681