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- //===- 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 "FuzzerPlatform.h"
- #include <cstdint>
- #if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \
- LIBFUZZER_FUCHSIA || LIBFUZZER_EMSCRIPTEN
- __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
- #endif
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