59 lines · cpp
1//===-- Unittests for memalignment ----------------------------------------===//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/stdint_proxy.h"10#include "src/stdlib/memalignment.h"11#include "test/UnitTest/Test.h"12 13TEST(LlvmLibcMemAlignmentTest, NullPointer) {14 void *ptr = nullptr;15 EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr), static_cast<size_t>(0));16}17 18TEST(LlvmLibcMemAlignmentTest, SpecificAlignment) {19 20 // These addresses have known alignment patterns - if we can construct them21 uintptr_t addr_align2 = 0x2; // 2-byte aligned22 uintptr_t addr_align4 = 0x4; // 4-byte aligned23 uintptr_t addr_align8 = 0x8; // 8-byte aligned24 uintptr_t addr_align16 = 0x10; // 16-byte aligned25 uintptr_t addr_align32 = 0x20; // 32-byte aligned26 27 void *ptr_align2 = reinterpret_cast<void *>(addr_align2);28 void *ptr_align4 = reinterpret_cast<void *>(addr_align4);29 void *ptr_align8 = reinterpret_cast<void *>(addr_align8);30 void *ptr_align16 = reinterpret_cast<void *>(addr_align16);31 void *ptr_align32 = reinterpret_cast<void *>(addr_align32);32 33 EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align2), static_cast<size_t>(2));34 EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align4), static_cast<size_t>(4));35 EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align8), static_cast<size_t>(8));36 EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align16), static_cast<size_t>(16));37 EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_align32), static_cast<size_t>(32));38 39 uintptr_t addr_complex = 0x1234560; // 16-byte aligned (ends in 0)40 void *ptr_complex = reinterpret_cast<void *>(addr_complex);41 EXPECT_EQ(LIBC_NAMESPACE::memalignment(ptr_complex), static_cast<size_t>(32));42}43 44TEST(LlvmLibcMemAlignmentTest, AlignasSpecifiedAlignment) {45 alignas(16) static int aligned_16;46 alignas(32) static int aligned_32;47 alignas(64) static int aligned_64;48 alignas(128) static int aligned_128;49 alignas(256) static int aligned_256;50 51 EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_16), static_cast<size_t>(16));52 EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_32), static_cast<size_t>(32));53 EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_64), static_cast<size_t>(64));54 EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_128),55 static_cast<size_t>(128));56 EXPECT_GE(LIBC_NAMESPACE::memalignment(&aligned_256),57 static_cast<size_t>(256));58}59