forked from OSchip/llvm-project
43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
//===- FuzzerExtraCounters.cpp - Extra coverage counters ------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Extra coverage counters defined by user code.
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//===----------------------------------------------------------------------===//
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#include "FuzzerPlatform.h"
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#include <cstdint>
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#if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \
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LIBFUZZER_FUCHSIA || LIBFUZZER_EMSCRIPTEN
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__attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters;
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__attribute__((weak)) extern uint8_t __stop___libfuzzer_extra_counters;
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namespace fuzzer {
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uint8_t *ExtraCountersBegin() { return &__start___libfuzzer_extra_counters; }
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uint8_t *ExtraCountersEnd() { return &__stop___libfuzzer_extra_counters; }
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ATTRIBUTE_NO_SANITIZE_ALL
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void ClearExtraCounters() { // hand-written memset, don't asan-ify.
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uintptr_t *Beg = reinterpret_cast<uintptr_t*>(ExtraCountersBegin());
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uintptr_t *End = reinterpret_cast<uintptr_t*>(ExtraCountersEnd());
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for (; Beg < End; Beg++) {
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*Beg = 0;
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__asm__ __volatile__("" : : : "memory");
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}
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}
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} // namespace fuzzer
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#else
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// TODO: implement for other platforms.
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namespace fuzzer {
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uint8_t *ExtraCountersBegin() { return nullptr; }
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uint8_t *ExtraCountersEnd() { return nullptr; }
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void ClearExtraCounters() {}
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} // namespace fuzzer
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#endif
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