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-exception
6//
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_LINUX
13#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 when
49 // accessing bytes before it.
50 // - The second one (top) is not necessarily aligned and faults when
51 // 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) && !defined(LIBC_HAS_SANITIZER)
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) && !defined(LIBC_HAS_SANITIZER)
71
72} // namespace LIBC_NAMESPACE_DECL
73

source code of libc/test/src/string/memset_test.cpp