| //===- FuzzerExtraCounters.cpp - Extra coverage counters ------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // Extra coverage counters defined by user code. |
| //===----------------------------------------------------------------------===// |
| |
| #include "FuzzerDefs.h" |
| |
| #if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \ |
| LIBFUZZER_OPENBSD |
| __attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters; |
| __attribute__((weak)) extern uint8_t __stop___libfuzzer_extra_counters; |
| |
| namespace fuzzer { |
| uint8_t *ExtraCountersBegin() { return &__start___libfuzzer_extra_counters; } |
| uint8_t *ExtraCountersEnd() { return &__stop___libfuzzer_extra_counters; } |
| ATTRIBUTE_NO_SANITIZE_ALL |
| void ClearExtraCounters() { // hand-written memset, don't asan-ify. |
| uintptr_t *Beg = reinterpret_cast<uintptr_t*>(ExtraCountersBegin()); |
| uintptr_t *End = reinterpret_cast<uintptr_t*>(ExtraCountersEnd()); |
| for (; Beg < End; Beg++) { |
| *Beg = 0; |
| __asm__ __volatile__("" : : : "memory"); |
| } |
| } |
| |
| } // namespace fuzzer |
| |
| #else |
| // TODO: implement for other platforms. |
| namespace fuzzer { |
| uint8_t *ExtraCountersBegin() { return nullptr; } |
| uint8_t *ExtraCountersEnd() { return nullptr; } |
| void ClearExtraCounters() {} |
| } // namespace fuzzer |
| |
| #endif |
