| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| class A { |
| public: |
| virtual int getRandomNumber() { |
| return 4; // chosen by fair dice roll. |
| // guaranteed to be random. |
| } |
| |
| virtual ~A() {} |
| }; |
| |
| A a; |
| |
| // nested macros to make it easy to define a large amount of read-only data |
| // which will require relocation. |
| #define A_16 &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, &a, |
| #define A_128 A_16 A_16 A_16 A_16 A_16 A_16 A_16 A_16 |
| #define A_1024 A_128 A_128 A_128 A_128 A_128 A_128 A_128 A_128 |
| |
| extern "C" A* const lots_of_relro[] = { |
| A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 A_1024 |
| }; |
| |
| extern "C" int getRandomNumber() { |
| // access the relro section (twice, in fact, once for the pointer, and once |
| // for the vtable of A) to check it's actually there. |
| return lots_of_relro[0]->getRandomNumber(); |
| } |