1/*
2 * Copyright (C) 2014 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
17class A {
18public:
19  virtual int getRandomNumber() {
20    return 4;  // chosen by fair dice roll.
21               // guaranteed to be random.
22  }
23
24  virtual ~A() {}
25};
26
27A a;
28
29// nested macros to make it easy to define a large amount of read-only data
30// which will require relocation.
31#define A_16 &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a,
32#define A_128 A_16 A_16 A_16 A_16 A_16 A_16 A_16 A_16
33#define A_1024 A_128 A_128 A_128 A_128 A_128 A_128 A_128 A_128
34
35extern "C" A* const lots_of_relro[] = {
36  A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024
37};
38
39extern "C" int getRandomNumber() {
40  // access the relro section (twice, in fact, once for the pointer, and once
41  // for the vtable of A) to check it's actually there.
42  return lots_of_relro[0]->getRandomNumber();
43}
44