1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 extern "C" int getRandomNumber(); 18 19 class B { 20 public: 21 virtual int getBiggerRandomNumber() { 22 // Call to the other library. 23 return getRandomNumber() * 2; 24 } 25 26 virtual ~B() {} 27 }; 28 29 B b; 30 31 // nested macros to make it easy to define a large amount of read-only data 32 // which will require relocation. 33 #define B_16 &b, &b, &b, &b, &b, &b, &b, &b, &b, &b, &b, &b, &b, &b, &b, &b, 34 #define B_128 B_16 B_16 B_16 B_16 B_16 B_16 B_16 B_16 35 #define B_1024 B_128 B_128 B_128 B_128 B_128 B_128 B_128 B_128 36 37 extern "C" B* const lots_more_relro[] = { 38 B_1024 B_1024 B_1024 B_1024 B_1024 B_1024 B_1024 B_1024 39 }; 40 41 extern "C" int getBiggerRandomNumber() { 42 // access the relro section (twice, in fact, once for the pointer, and once 43 // for the vtable of B) to check it's actually there. 44 return lots_more_relro[0]->getBiggerRandomNumber(); 45 } 46
