| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| |
| // Tests whether scaling the Entropic scheduling weight based on input execution |
| // time is effective or not. Inputs of size 10 will take at least 100 |
| // microseconds more than any input of size 1-9. The input of size 2 in the |
| // corpus should be favored by the exec-time-scaled Entropic scheduling policy |
| // than the input of size 10 in the corpus, eventually finding the crashing |
| // input {0xab, 0xcd} with less executions. |
| #include <chrono> |
| #include <cstdint> |
| #include <thread> |
| |
| static volatile int Sink; |
| static volatile int *Nil = nullptr; |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { |
| if (Size > 10) |
| return 0; // To make the test quicker. |
| |
| if (Size == 10) { |
| size_t ExecTimeUSec = 100; |
| std::this_thread::sleep_for(std::chrono::microseconds(ExecTimeUSec)); |
| |
| Sink = 0; // execute a lot slower than the crashing input below. |
| } |
| |
| if (Size == 2 && Data[0] == 0xab && Data[1] == 0xcd) |
| *Nil = 42; // crash. |
| |
| return 0; |
| } |