| // Copyright 2023 The Centipede Authors. |
| // |
| // 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 |
| // |
| // https://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. |
| |
| #include <cstddef> |
| #include <cstdint> |
| #include <cstdio> |
| |
| static int sink; |
| |
| // Instrumented function that runs at startup. We want it's coverage ignored. |
| __attribute__((constructor, noinline)) void Startup() { |
| fprintf(stderr, "Startup\n"); |
| // Function entry: generate a coverage feature. |
| sink++; // generate data flow feature |
| if (sink == (sink == 42)) // generate some cmp features |
| Startup(); |
| } |
| |
| // A fuzz target used for testing Centipede. |
| // Does nothing, returns 0. There is a startup code that runs before the target. |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { |
| return 0; |
| } |