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//===-- Unittests for memset ----------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "hdr/signal_macros.h"
#include "memory_utils/memory_check_utils.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/properties/os.h" // LIBC_TARGET_OS_IS_LINUX
#include "src/string/memset.h"
#include "test/UnitTest/Test.h"
#if !defined(LIBC_FULL_BUILD) && defined(LIBC_TARGET_OS_IS_LINUX)
#include "memory_utils/protected_pages.h"
#endif // !defined(LIBC_FULL_BUILD) && defined(LIBC_TARGET_OS_IS_LINUX)
namespace LIBC_NAMESPACE_DECL {
// Adapt CheckMemset signature to memset.
static inline void Adaptor(cpp::span<char> p1, uint8_t value, size_t size) {
LIBC_NAMESPACE::memset(p1.begin(), value, size);
}
TEST(LlvmLibcMemsetTest, SizeSweep) {
static constexpr size_t kMaxSize = 400;
Buffer DstBuffer(kMaxSize);
for (size_t size = 0; size < kMaxSize; ++size) {
const uint8_t value = size % 10;
auto dst = DstBuffer.span().subspan(0, size);
ASSERT_TRUE((CheckMemset<Adaptor>(dst, value, size)));
}
}
#if !defined(LIBC_FULL_BUILD) && defined(LIBC_TARGET_OS_IS_LINUX)
TEST(LlvmLibcMemsetTest, CheckAccess) {
static constexpr size_t MAX_SIZE = 1024;
LIBC_ASSERT(MAX_SIZE < GetPageSize());
ProtectedPages pages;
const Page write_buffer = pages.GetPageA().WithAccess(PROT_WRITE);
const cpp::array<int, 2> fill_chars = {0, 0x7F};
for (int fill_char : fill_chars) {
for (size_t size = 0; size < MAX_SIZE; ++size) {
// We cross-check the function with two destinations.
// - The first of them (bottom) is always page aligned and faults when
// accessing bytes before it.
// - The second one (top) is not necessarily aligned and faults when
// accessing bytes after it.
uint8_t *destinations[2] = {write_buffer.bottom(size),
write_buffer.top(size)};
for (uint8_t *dst : destinations) {
LIBC_NAMESPACE::memset(dst, fill_char, size);
}
}
}
}
#endif // !defined(LIBC_FULL_BUILD) && defined(LIBC_TARGET_OS_IS_LINUX)
#if defined(LIBC_ADD_NULL_CHECKS)
TEST(LlvmLibcMemsetTest, CrashOnNullPtr) {
ASSERT_DEATH([]() { LIBC_NAMESPACE::memset(nullptr, 0, 1); },
WITH_SIGNAL(-1));
}
#endif // defined(LIBC_ADD_NULL_CHECKS)
} // namespace LIBC_NAMESPACE_DECL
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