73 lines · cpp
1//===-- Unittests for memset ----------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "hdr/signal_macros.h"10#include "memory_utils/memory_check_utils.h"11#include "src/__support/macros/config.h"12#include "src/__support/macros/properties/os.h" // LIBC_TARGET_OS_IS_LINUX13#include "src/string/memset.h"14#include "test/UnitTest/Test.h"15 16#if !defined(LIBC_FULL_BUILD) && defined(LIBC_TARGET_OS_IS_LINUX)17#include "memory_utils/protected_pages.h"18#endif // !defined(LIBC_FULL_BUILD) && defined(LIBC_TARGET_OS_IS_LINUX)19 20namespace LIBC_NAMESPACE_DECL {21 22// Adapt CheckMemset signature to memset.23static inline void Adaptor(cpp::span<char> p1, uint8_t value, size_t size) {24 LIBC_NAMESPACE::memset(p1.begin(), value, size);25}26 27TEST(LlvmLibcMemsetTest, SizeSweep) {28 static constexpr size_t kMaxSize = 400;29 Buffer DstBuffer(kMaxSize);30 for (size_t size = 0; size < kMaxSize; ++size) {31 const uint8_t value = size % 10;32 auto dst = DstBuffer.span().subspan(0, size);33 ASSERT_TRUE((CheckMemset<Adaptor>(dst, value, size)));34 }35}36 37#if !defined(LIBC_FULL_BUILD) && defined(LIBC_TARGET_OS_IS_LINUX)38 39TEST(LlvmLibcMemsetTest, CheckAccess) {40 static constexpr size_t MAX_SIZE = 1024;41 LIBC_ASSERT(MAX_SIZE < GetPageSize());42 ProtectedPages pages;43 const Page write_buffer = pages.GetPageA().WithAccess(PROT_WRITE);44 const cpp::array<int, 2> fill_chars = {0, 0x7F};45 for (int fill_char : fill_chars) {46 for (size_t size = 0; size < MAX_SIZE; ++size) {47 // We cross-check the function with two destinations.48 // - The first of them (bottom) is always page aligned and faults when49 // accessing bytes before it.50 // - The second one (top) is not necessarily aligned and faults when51 // accessing bytes after it.52 uint8_t *destinations[2] = {write_buffer.bottom(size),53 write_buffer.top(size)};54 for (uint8_t *dst : destinations) {55 LIBC_NAMESPACE::memset(dst, fill_char, size);56 }57 }58 }59}60 61#endif // !defined(LIBC_FULL_BUILD) && defined(LIBC_TARGET_OS_IS_LINUX)62 63#if defined(LIBC_ADD_NULL_CHECKS)64 65TEST(LlvmLibcMemsetTest, CrashOnNullPtr) {66 ASSERT_DEATH([]() { LIBC_NAMESPACE::memset(nullptr, 0, 1); },67 WITH_SIGNAL(-1));68}69 70#endif // defined(LIBC_ADD_NULL_CHECKS)71 72} // namespace LIBC_NAMESPACE_DECL73