1 //=== - llvm/unittest/Support/AlignOfTest.cpp - Alignment utility tests ---===// 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 #ifdef _MSC_VER 10 // Disable warnings about alignment-based structure padding. 11 // This must be above the includes to suppress warnings in included templates. 12 #pragma warning(disable:4324) 13 #endif 14 15 #include "llvm/Support/AlignOf.h" 16 #include "llvm/Support/Compiler.h" 17 #include "gtest/gtest.h" 18 19 using namespace llvm; 20 21 namespace { 22 // Disable warnings about questionable type definitions. 23 // We're testing that even questionable types work with the alignment utilities. 24 #ifdef _MSC_VER 25 #pragma warning(disable:4584) 26 #endif 27 28 // Suppress direct base '{anonymous}::S1' inaccessible in '{anonymous}::D9' 29 // due to ambiguity warning. 30 #ifdef __clang__ 31 #pragma clang diagnostic ignored "-Wunknown-pragmas" 32 #pragma clang diagnostic ignored "-Winaccessible-base" 33 #elif ((__GNUC__ * 100) + __GNUC_MINOR__) >= 402 34 // Pragma based warning suppression was introduced in GGC 4.2. Additionally 35 // this warning is "enabled by default". The warning still appears if -Wall is 36 // suppressed. Apparently GCC suppresses it when -w is specifed, which is odd. 37 #pragma GCC diagnostic warning "-w" 38 #endif 39 40 // Define some fixed alignment types to use in these tests. 41 struct alignas(1) A1 {}; 42 struct alignas(2) A2 {}; 43 struct alignas(4) A4 {}; 44 struct alignas(8) A8 {}; 45 46 struct S1 {}; 47 struct S2 { char a; }; 48 struct S3 { int x; }; 49 struct S4 { double y; }; 50 struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; }; 51 struct S6 { double f(); }; 52 struct D1 : S1 {}; 53 struct D2 : S6 { float g(); }; 54 struct D3 : S2 {}; 55 struct D4 : S2 { int x; }; 56 struct D5 : S3 { char c; }; 57 struct D6 : S2, S3 {}; 58 struct D7 : S1, S3 {}; 59 struct D8 : S1, D4, D5 { double x[2]; }; 60 struct D9 : S1, D1 { S1 s1; }; 61 struct V1 { virtual ~V1(); }; 62 struct V2 { int x; virtual ~V2(); }; 63 struct V3 : V1 { 64 ~V3() override; 65 }; 66 struct V4 : virtual V2 { int y; 67 ~V4() override; 68 }; 69 struct V5 : V4, V3 { double z; 70 ~V5() override; 71 }; 72 struct V6 : S1 { virtual ~V6(); }; 73 struct V7 : virtual V2, virtual V6 { 74 ~V7() override; 75 }; 76 struct V8 : V5, virtual V6, V7 { double zz; 77 ~V8() override; 78 }; 79 80 double S6::f() { return 0.0; } 81 float D2::g() { return 0.0f; } 82 V1::~V1() {} 83 V2::~V2() {} 84 V3::~V3() {} 85 V4::~V4() {} 86 V5::~V5() {} 87 V6::~V6() {} 88 V7::~V7() {} 89 V8::~V8() {} 90 91 template <typename M> struct T { M m; }; 92 93 TEST(AlignOfTest, BasicAlignedArray) { 94 EXPECT_LE(1u, alignof(AlignedCharArrayUnion<A1>)); 95 EXPECT_LE(2u, alignof(AlignedCharArrayUnion<A2>)); 96 EXPECT_LE(4u, alignof(AlignedCharArrayUnion<A4>)); 97 EXPECT_LE(8u, alignof(AlignedCharArrayUnion<A8>)); 98 99 EXPECT_LE(1u, sizeof(AlignedCharArrayUnion<A1>)); 100 EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<A2>)); 101 EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<A4>)); 102 EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<A8>)); 103 104 EXPECT_EQ(1u, (alignof(AlignedCharArrayUnion<A1>))); 105 EXPECT_EQ(2u, (alignof(AlignedCharArrayUnion<A1, A2>))); 106 EXPECT_EQ(4u, (alignof(AlignedCharArrayUnion<A1, A2, A4>))); 107 EXPECT_EQ(8u, (alignof(AlignedCharArrayUnion<A1, A2, A4, A8>))); 108 109 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1>)); 110 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1, A2>)); 111 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1, A2, A4>)); 112 EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<A1, A2, A4, A8>)); 113 114 EXPECT_EQ(1u, (alignof(AlignedCharArrayUnion<A1[1]>))); 115 EXPECT_EQ(2u, (alignof(AlignedCharArrayUnion<A1[2], A2[1]>))); 116 EXPECT_EQ(4u, (alignof(AlignedCharArrayUnion<A1[42], A2[55], A4[13]>))); 117 EXPECT_EQ(8u, (alignof(AlignedCharArrayUnion<A1[2], A2[1], A4, A8>))); 118 119 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1[1]>)); 120 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1[2], A2[1]>)); 121 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1[3], A2[2], A4>)); 122 EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<A1, A2[3], 123 A4[3], A8>)); 124 125 // For other tests we simply assert that the alignment of the union mathes 126 // that of the fundamental type and hope that we have any weird type 127 // productions that would trigger bugs. 128 EXPECT_EQ(alignof(T<char>), alignof(AlignedCharArrayUnion<char>)); 129 EXPECT_EQ(alignof(T<short>), alignof(AlignedCharArrayUnion<short>)); 130 EXPECT_EQ(alignof(T<int>), alignof(AlignedCharArrayUnion<int>)); 131 EXPECT_EQ(alignof(T<long>), alignof(AlignedCharArrayUnion<long>)); 132 EXPECT_EQ(alignof(T<long long>), alignof(AlignedCharArrayUnion<long long>)); 133 EXPECT_EQ(alignof(T<float>), alignof(AlignedCharArrayUnion<float>)); 134 EXPECT_EQ(alignof(T<double>), alignof(AlignedCharArrayUnion<double>)); 135 EXPECT_EQ(alignof(T<long double>), 136 alignof(AlignedCharArrayUnion<long double>)); 137 EXPECT_EQ(alignof(T<void *>), alignof(AlignedCharArrayUnion<void *>)); 138 EXPECT_EQ(alignof(T<int *>), alignof(AlignedCharArrayUnion<int *>)); 139 EXPECT_EQ(alignof(T<double (*)(double)>), 140 alignof(AlignedCharArrayUnion<double (*)(double)>)); 141 EXPECT_EQ(alignof(T<double (S6::*)()>), 142 alignof(AlignedCharArrayUnion<double (S6::*)()>)); 143 EXPECT_EQ(alignof(S1), alignof(AlignedCharArrayUnion<S1>)); 144 EXPECT_EQ(alignof(S2), alignof(AlignedCharArrayUnion<S2>)); 145 EXPECT_EQ(alignof(S3), alignof(AlignedCharArrayUnion<S3>)); 146 EXPECT_EQ(alignof(S4), alignof(AlignedCharArrayUnion<S4>)); 147 EXPECT_EQ(alignof(S5), alignof(AlignedCharArrayUnion<S5>)); 148 EXPECT_EQ(alignof(S6), alignof(AlignedCharArrayUnion<S6>)); 149 EXPECT_EQ(alignof(D1), alignof(AlignedCharArrayUnion<D1>)); 150 EXPECT_EQ(alignof(D2), alignof(AlignedCharArrayUnion<D2>)); 151 EXPECT_EQ(alignof(D3), alignof(AlignedCharArrayUnion<D3>)); 152 EXPECT_EQ(alignof(D4), alignof(AlignedCharArrayUnion<D4>)); 153 EXPECT_EQ(alignof(D5), alignof(AlignedCharArrayUnion<D5>)); 154 EXPECT_EQ(alignof(D6), alignof(AlignedCharArrayUnion<D6>)); 155 EXPECT_EQ(alignof(D7), alignof(AlignedCharArrayUnion<D7>)); 156 EXPECT_EQ(alignof(D8), alignof(AlignedCharArrayUnion<D8>)); 157 EXPECT_EQ(alignof(D9), alignof(AlignedCharArrayUnion<D9>)); 158 EXPECT_EQ(alignof(V1), alignof(AlignedCharArrayUnion<V1>)); 159 EXPECT_EQ(alignof(V2), alignof(AlignedCharArrayUnion<V2>)); 160 EXPECT_EQ(alignof(V3), alignof(AlignedCharArrayUnion<V3>)); 161 EXPECT_EQ(alignof(V4), alignof(AlignedCharArrayUnion<V4>)); 162 EXPECT_EQ(alignof(V5), alignof(AlignedCharArrayUnion<V5>)); 163 EXPECT_EQ(alignof(V6), alignof(AlignedCharArrayUnion<V6>)); 164 EXPECT_EQ(alignof(V7), alignof(AlignedCharArrayUnion<V7>)); 165 166 // Some versions of MSVC get this wrong somewhat disturbingly. The failure 167 // appears to be benign: alignof(V8) produces a preposterous value: 12 168 #ifndef _MSC_VER 169 EXPECT_EQ(alignof(V8), alignof(AlignedCharArrayUnion<V8>)); 170 #endif 171 172 EXPECT_EQ(sizeof(char), sizeof(AlignedCharArrayUnion<char>)); 173 EXPECT_EQ(sizeof(char[1]), sizeof(AlignedCharArrayUnion<char[1]>)); 174 EXPECT_EQ(sizeof(char[2]), sizeof(AlignedCharArrayUnion<char[2]>)); 175 EXPECT_EQ(sizeof(char[3]), sizeof(AlignedCharArrayUnion<char[3]>)); 176 EXPECT_EQ(sizeof(char[4]), sizeof(AlignedCharArrayUnion<char[4]>)); 177 EXPECT_EQ(sizeof(char[5]), sizeof(AlignedCharArrayUnion<char[5]>)); 178 EXPECT_EQ(sizeof(char[8]), sizeof(AlignedCharArrayUnion<char[8]>)); 179 EXPECT_EQ(sizeof(char[13]), sizeof(AlignedCharArrayUnion<char[13]>)); 180 EXPECT_EQ(sizeof(char[16]), sizeof(AlignedCharArrayUnion<char[16]>)); 181 EXPECT_EQ(sizeof(char[21]), sizeof(AlignedCharArrayUnion<char[21]>)); 182 EXPECT_EQ(sizeof(char[32]), sizeof(AlignedCharArrayUnion<char[32]>)); 183 EXPECT_EQ(sizeof(short), sizeof(AlignedCharArrayUnion<short>)); 184 EXPECT_EQ(sizeof(int), sizeof(AlignedCharArrayUnion<int>)); 185 EXPECT_EQ(sizeof(long), sizeof(AlignedCharArrayUnion<long>)); 186 EXPECT_EQ(sizeof(long long), 187 sizeof(AlignedCharArrayUnion<long long>)); 188 EXPECT_EQ(sizeof(float), sizeof(AlignedCharArrayUnion<float>)); 189 EXPECT_EQ(sizeof(double), sizeof(AlignedCharArrayUnion<double>)); 190 EXPECT_EQ(sizeof(long double), 191 sizeof(AlignedCharArrayUnion<long double>)); 192 EXPECT_EQ(sizeof(void *), sizeof(AlignedCharArrayUnion<void *>)); 193 EXPECT_EQ(sizeof(int *), sizeof(AlignedCharArrayUnion<int *>)); 194 EXPECT_EQ(sizeof(double (*)(double)), 195 sizeof(AlignedCharArrayUnion<double (*)(double)>)); 196 EXPECT_EQ(sizeof(double (S6::*)()), 197 sizeof(AlignedCharArrayUnion<double (S6::*)()>)); 198 EXPECT_EQ(sizeof(S1), sizeof(AlignedCharArrayUnion<S1>)); 199 EXPECT_EQ(sizeof(S2), sizeof(AlignedCharArrayUnion<S2>)); 200 EXPECT_EQ(sizeof(S3), sizeof(AlignedCharArrayUnion<S3>)); 201 EXPECT_EQ(sizeof(S4), sizeof(AlignedCharArrayUnion<S4>)); 202 EXPECT_EQ(sizeof(S5), sizeof(AlignedCharArrayUnion<S5>)); 203 EXPECT_EQ(sizeof(S6), sizeof(AlignedCharArrayUnion<S6>)); 204 EXPECT_EQ(sizeof(D1), sizeof(AlignedCharArrayUnion<D1>)); 205 EXPECT_EQ(sizeof(D2), sizeof(AlignedCharArrayUnion<D2>)); 206 EXPECT_EQ(sizeof(D3), sizeof(AlignedCharArrayUnion<D3>)); 207 EXPECT_EQ(sizeof(D4), sizeof(AlignedCharArrayUnion<D4>)); 208 EXPECT_EQ(sizeof(D5), sizeof(AlignedCharArrayUnion<D5>)); 209 EXPECT_EQ(sizeof(D6), sizeof(AlignedCharArrayUnion<D6>)); 210 EXPECT_EQ(sizeof(D7), sizeof(AlignedCharArrayUnion<D7>)); 211 EXPECT_EQ(sizeof(D8), sizeof(AlignedCharArrayUnion<D8>)); 212 EXPECT_EQ(sizeof(D9), sizeof(AlignedCharArrayUnion<D9>)); 213 EXPECT_EQ(sizeof(D9[1]), sizeof(AlignedCharArrayUnion<D9[1]>)); 214 EXPECT_EQ(sizeof(D9[2]), sizeof(AlignedCharArrayUnion<D9[2]>)); 215 EXPECT_EQ(sizeof(D9[3]), sizeof(AlignedCharArrayUnion<D9[3]>)); 216 EXPECT_EQ(sizeof(D9[4]), sizeof(AlignedCharArrayUnion<D9[4]>)); 217 EXPECT_EQ(sizeof(D9[5]), sizeof(AlignedCharArrayUnion<D9[5]>)); 218 EXPECT_EQ(sizeof(D9[8]), sizeof(AlignedCharArrayUnion<D9[8]>)); 219 EXPECT_EQ(sizeof(D9[13]), sizeof(AlignedCharArrayUnion<D9[13]>)); 220 EXPECT_EQ(sizeof(D9[16]), sizeof(AlignedCharArrayUnion<D9[16]>)); 221 EXPECT_EQ(sizeof(D9[21]), sizeof(AlignedCharArrayUnion<D9[21]>)); 222 EXPECT_EQ(sizeof(D9[32]), sizeof(AlignedCharArrayUnion<D9[32]>)); 223 EXPECT_EQ(sizeof(V1), sizeof(AlignedCharArrayUnion<V1>)); 224 EXPECT_EQ(sizeof(V2), sizeof(AlignedCharArrayUnion<V2>)); 225 EXPECT_EQ(sizeof(V3), sizeof(AlignedCharArrayUnion<V3>)); 226 EXPECT_EQ(sizeof(V4), sizeof(AlignedCharArrayUnion<V4>)); 227 EXPECT_EQ(sizeof(V5), sizeof(AlignedCharArrayUnion<V5>)); 228 EXPECT_EQ(sizeof(V6), sizeof(AlignedCharArrayUnion<V6>)); 229 EXPECT_EQ(sizeof(V7), sizeof(AlignedCharArrayUnion<V7>)); 230 231 // Some versions of MSVC also get this wrong. The failure again appears to be 232 // benign: sizeof(V8) is only 52 bytes, but our array reserves 56. 233 #ifndef _MSC_VER 234 EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>)); 235 #endif 236 } 237 } // end anonymous namespace 238