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//===-- Unittests for memalignment ----------------------------------------===//
//
// 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/stdint_proxy.h"
#include "src/stdlib/memalignment.h"
#include "test/UnitTest/Test.h"
TEST(LlvmLibcMemAlignmentTest, NullPointer) {
void *ptr = nullptr;
EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr), static_cast<size_t>(0));
}
TEST(LlvmLibcMemAlignmentTest, SpecificAlignment) {
// These addresses have known alignment patterns - if we can construct them
uintptr_t addr_align2 = 0x2; // 2-byte aligned
uintptr_t addr_align4 = 0x4; // 4-byte aligned
uintptr_t addr_align8 = 0x8; // 8-byte aligned
uintptr_t addr_align16 = 0x10; // 16-byte aligned
uintptr_t addr_align32 = 0x20; // 32-byte aligned
void *ptr_align2 = reinterpret_cast<void *>(addr_align2);
void *ptr_align4 = reinterpret_cast<void *>(addr_align4);
void *ptr_align8 = reinterpret_cast<void *>(addr_align8);
void *ptr_align16 = reinterpret_cast<void *>(addr_align16);
void *ptr_align32 = reinterpret_cast<void *>(addr_align32);
EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align2), static_cast<size_t>(2));
EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align4), static_cast<size_t>(4));
EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align8), static_cast<size_t>(8));
EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align16), static_cast<size_t>(16));
EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align32), static_cast<size_t>(32));
uintptr_t addr_complex = 0x1234560; // 16-byte aligned (ends in 0)
void *ptr_complex = reinterpret_cast<void *>(addr_complex);
EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_complex), static_cast<size_t>(32));
}
TEST(LlvmLibcMemAlignmentTest, AlignasSpecifiedAlignment) {
alignas(16) static int aligned_16;
alignas(32) static int aligned_32;
alignas(64) static int aligned_64;
alignas(128) static int aligned_128;
alignas(256) static int aligned_256;
EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_16), static_cast<size_t>(16));
EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_32), static_cast<size_t>(32));
EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_64), static_cast<size_t>(64));
EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_128),
static_cast<size_t>(128));
EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_256),
static_cast<size_t>(256));
}
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