1 //=== - llvm/unittest/Support/AlignOfTest.cpp - Alignment utility tests ----===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifdef _MSC_VER 11 // Disable warnings about alignment-based structure padding. 12 // This must be above the includes to suppress warnings in included templates. 13 #pragma warning(disable:4324) 14 #endif 15 16 #include "llvm/Support/AlignOf.h" 17 #include "llvm/Support/Compiler.h" 18 #include "gtest/gtest.h" 19 20 using namespace llvm; 21 22 namespace { 23 // Disable warnings about questionable type definitions. 24 // We're testing that even questionable types work with the alignment utilities. 25 #ifdef _MSC_VER 26 #pragma warning(disable:4584) 27 #endif 28 29 // Suppress direct base '{anonymous}::S1' inaccessible in '{anonymous}::D9' 30 // due to ambiguity warning. 31 #ifdef __clang__ 32 #pragma clang diagnostic ignored "-Wunknown-pragmas" 33 #pragma clang diagnostic ignored "-Winaccessible-base" 34 #elif ((__GNUC__ * 100) + __GNUC_MINOR__) >= 402 35 // Pragma based warning suppression was introduced in GGC 4.2. Additionally 36 // this warning is "enabled by default". The warning still appears if -Wall is 37 // suppressed. Apparently GCC suppresses it when -w is specifed, which is odd. 38 #pragma GCC diagnostic warning "-w" 39 #endif 40 41 // Define some fixed alignment types to use in these tests. 42 #if __has_feature(cxx_alignas) 43 struct alignas(1) A1 { }; 44 struct alignas(2) A2 { }; 45 struct alignas(4) A4 { }; 46 struct alignas(8) A8 { }; 47 #elif defined(__GNUC__) 48 struct A1 { } __attribute__((aligned(1))); 49 struct A2 { } __attribute__((aligned(2))); 50 struct A4 { } __attribute__((aligned(4))); 51 struct A8 { } __attribute__((aligned(8))); 52 #elif defined(_MSC_VER) 53 __declspec(align(1)) struct A1 { }; 54 __declspec(align(2)) struct A2 { }; 55 __declspec(align(4)) struct A4 { }; 56 __declspec(align(8)) struct A8 { }; 57 #else 58 # error No supported align as directive. 59 #endif 60 61 struct S1 {}; 62 struct S2 { char a; }; 63 struct S3 { int x; }; 64 struct S4 { double y; }; 65 struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; }; 66 struct S6 { double f(); }; 67 struct D1 : S1 {}; 68 struct D2 : S6 { float g(); }; 69 struct D3 : S2 {}; 70 struct D4 : S2 { int x; }; 71 struct D5 : S3 { char c; }; 72 struct D6 : S2, S3 {}; 73 struct D7 : S1, S3 {}; 74 struct D8 : S1, D4, D5 { double x[2]; }; 75 struct D9 : S1, D1 { S1 s1; }; 76 struct V1 { virtual ~V1(); }; 77 struct V2 { int x; virtual ~V2(); }; 78 struct V3 : V1 { virtual ~V3(); }; 79 struct V4 : virtual V2 { int y; virtual ~V4(); }; 80 struct V5 : V4, V3 { double z; virtual ~V5(); }; 81 struct V6 : S1 { virtual ~V6(); }; 82 struct V7 : virtual V2, virtual V6 { virtual ~V7(); }; 83 struct V8 : V5, virtual V6, V7 { double zz; virtual ~V8(); }; 84 85 double S6::f() { return 0.0; } 86 float D2::g() { return 0.0f; } 87 V1::~V1() {} 88 V2::~V2() {} 89 V3::~V3() {} 90 V4::~V4() {} 91 V5::~V5() {} 92 V6::~V6() {} 93 V7::~V7() {} 94 V8::~V8() {} 95 96 // Ensure alignment is a compile-time constant. 97 char LLVM_ATTRIBUTE_UNUSED test_arr1 98 [AlignOf<char>::Alignment > 0] 99 [AlignOf<short>::Alignment > 0] 100 [AlignOf<int>::Alignment > 0] 101 [AlignOf<long>::Alignment > 0] 102 [AlignOf<long long>::Alignment > 0] 103 [AlignOf<float>::Alignment > 0] 104 [AlignOf<double>::Alignment > 0] 105 [AlignOf<long double>::Alignment > 0] 106 [AlignOf<void *>::Alignment > 0] 107 [AlignOf<int *>::Alignment > 0] 108 [AlignOf<double (*)(double)>::Alignment > 0] 109 [AlignOf<double (S6::*)()>::Alignment > 0]; 110 char LLVM_ATTRIBUTE_UNUSED test_arr2 111 [AlignOf<A1>::Alignment > 0] 112 [AlignOf<A2>::Alignment > 0] 113 [AlignOf<A4>::Alignment > 0] 114 [AlignOf<A8>::Alignment > 0]; 115 char LLVM_ATTRIBUTE_UNUSED test_arr3 116 [AlignOf<S1>::Alignment > 0] 117 [AlignOf<S2>::Alignment > 0] 118 [AlignOf<S3>::Alignment > 0] 119 [AlignOf<S4>::Alignment > 0] 120 [AlignOf<S5>::Alignment > 0] 121 [AlignOf<S6>::Alignment > 0]; 122 char LLVM_ATTRIBUTE_UNUSED test_arr4 123 [AlignOf<D1>::Alignment > 0] 124 [AlignOf<D2>::Alignment > 0] 125 [AlignOf<D3>::Alignment > 0] 126 [AlignOf<D4>::Alignment > 0] 127 [AlignOf<D5>::Alignment > 0] 128 [AlignOf<D6>::Alignment > 0] 129 [AlignOf<D7>::Alignment > 0] 130 [AlignOf<D8>::Alignment > 0] 131 [AlignOf<D9>::Alignment > 0]; 132 char LLVM_ATTRIBUTE_UNUSED test_arr5 133 [AlignOf<V1>::Alignment > 0] 134 [AlignOf<V2>::Alignment > 0] 135 [AlignOf<V3>::Alignment > 0] 136 [AlignOf<V4>::Alignment > 0] 137 [AlignOf<V5>::Alignment > 0] 138 [AlignOf<V6>::Alignment > 0] 139 [AlignOf<V7>::Alignment > 0] 140 [AlignOf<V8>::Alignment > 0]; 141 142 TEST(AlignOfTest, BasicAlignmentInvariants) { 143 EXPECT_LE(1u, alignOf<A1>()); 144 EXPECT_LE(2u, alignOf<A2>()); 145 EXPECT_LE(4u, alignOf<A4>()); 146 EXPECT_LE(8u, alignOf<A8>()); 147 148 EXPECT_EQ(1u, alignOf<char>()); 149 EXPECT_LE(alignOf<char>(), alignOf<short>()); 150 EXPECT_LE(alignOf<short>(), alignOf<int>()); 151 EXPECT_LE(alignOf<int>(), alignOf<long>()); 152 EXPECT_LE(alignOf<long>(), alignOf<long long>()); 153 EXPECT_LE(alignOf<char>(), alignOf<float>()); 154 EXPECT_LE(alignOf<float>(), alignOf<double>()); 155 EXPECT_LE(alignOf<char>(), alignOf<long double>()); 156 EXPECT_LE(alignOf<char>(), alignOf<void *>()); 157 EXPECT_EQ(alignOf<void *>(), alignOf<int *>()); 158 EXPECT_LE(alignOf<char>(), alignOf<S1>()); 159 EXPECT_LE(alignOf<S1>(), alignOf<S2>()); 160 EXPECT_LE(alignOf<S1>(), alignOf<S3>()); 161 EXPECT_LE(alignOf<S1>(), alignOf<S4>()); 162 EXPECT_LE(alignOf<S1>(), alignOf<S5>()); 163 EXPECT_LE(alignOf<S1>(), alignOf<S6>()); 164 EXPECT_LE(alignOf<S1>(), alignOf<D1>()); 165 EXPECT_LE(alignOf<S1>(), alignOf<D2>()); 166 EXPECT_LE(alignOf<S1>(), alignOf<D3>()); 167 EXPECT_LE(alignOf<S1>(), alignOf<D4>()); 168 EXPECT_LE(alignOf<S1>(), alignOf<D5>()); 169 EXPECT_LE(alignOf<S1>(), alignOf<D6>()); 170 EXPECT_LE(alignOf<S1>(), alignOf<D7>()); 171 EXPECT_LE(alignOf<S1>(), alignOf<D8>()); 172 EXPECT_LE(alignOf<S1>(), alignOf<D9>()); 173 EXPECT_LE(alignOf<S1>(), alignOf<V1>()); 174 EXPECT_LE(alignOf<V1>(), alignOf<V2>()); 175 EXPECT_LE(alignOf<V1>(), alignOf<V3>()); 176 EXPECT_LE(alignOf<V1>(), alignOf<V4>()); 177 EXPECT_LE(alignOf<V1>(), alignOf<V5>()); 178 EXPECT_LE(alignOf<V1>(), alignOf<V6>()); 179 EXPECT_LE(alignOf<V1>(), alignOf<V7>()); 180 EXPECT_LE(alignOf<V1>(), alignOf<V8>()); 181 } 182 183 TEST(AlignOfTest, BasicAlignedArray) { 184 EXPECT_LE(1u, alignOf<AlignedCharArrayUnion<A1> >()); 185 EXPECT_LE(2u, alignOf<AlignedCharArrayUnion<A2> >()); 186 EXPECT_LE(4u, alignOf<AlignedCharArrayUnion<A4> >()); 187 EXPECT_LE(8u, alignOf<AlignedCharArrayUnion<A8> >()); 188 189 EXPECT_LE(1u, sizeof(AlignedCharArrayUnion<A1>)); 190 EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<A2>)); 191 EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<A4>)); 192 EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<A8>)); 193 194 EXPECT_EQ(1u, (alignOf<AlignedCharArrayUnion<A1> >())); 195 EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<A1, A2> >())); 196 EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<A1, A2, A4> >())); 197 EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<A1, A2, A4, A8> >())); 198 199 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1>)); 200 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1, A2>)); 201 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1, A2, A4>)); 202 EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<A1, A2, A4, A8>)); 203 204 EXPECT_EQ(1u, (alignOf<AlignedCharArrayUnion<A1[1]> >())); 205 EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<A1[2], A2[1]> >())); 206 EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<A1[42], A2[55], 207 A4[13]> >())); 208 EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<A1[2], A2[1], 209 A4, A8> >())); 210 211 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1[1]>)); 212 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1[2], A2[1]>)); 213 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1[3], A2[2], A4>)); 214 EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<A1, A2[3], 215 A4[3], A8>)); 216 217 // For other tests we simply assert that the alignment of the union mathes 218 // that of the fundamental type and hope that we have any weird type 219 // productions that would trigger bugs. 220 EXPECT_EQ(alignOf<char>(), alignOf<AlignedCharArrayUnion<char> >()); 221 EXPECT_EQ(alignOf<short>(), alignOf<AlignedCharArrayUnion<short> >()); 222 EXPECT_EQ(alignOf<int>(), alignOf<AlignedCharArrayUnion<int> >()); 223 EXPECT_EQ(alignOf<long>(), alignOf<AlignedCharArrayUnion<long> >()); 224 EXPECT_EQ(alignOf<long long>(), 225 alignOf<AlignedCharArrayUnion<long long> >()); 226 EXPECT_EQ(alignOf<float>(), alignOf<AlignedCharArrayUnion<float> >()); 227 EXPECT_EQ(alignOf<double>(), alignOf<AlignedCharArrayUnion<double> >()); 228 EXPECT_EQ(alignOf<long double>(), 229 alignOf<AlignedCharArrayUnion<long double> >()); 230 EXPECT_EQ(alignOf<void *>(), alignOf<AlignedCharArrayUnion<void *> >()); 231 EXPECT_EQ(alignOf<int *>(), alignOf<AlignedCharArrayUnion<int *> >()); 232 EXPECT_EQ(alignOf<double (*)(double)>(), 233 alignOf<AlignedCharArrayUnion<double (*)(double)> >()); 234 EXPECT_EQ(alignOf<double (S6::*)()>(), 235 alignOf<AlignedCharArrayUnion<double (S6::*)()> >()); 236 EXPECT_EQ(alignOf<S1>(), alignOf<AlignedCharArrayUnion<S1> >()); 237 EXPECT_EQ(alignOf<S2>(), alignOf<AlignedCharArrayUnion<S2> >()); 238 EXPECT_EQ(alignOf<S3>(), alignOf<AlignedCharArrayUnion<S3> >()); 239 EXPECT_EQ(alignOf<S4>(), alignOf<AlignedCharArrayUnion<S4> >()); 240 EXPECT_EQ(alignOf<S5>(), alignOf<AlignedCharArrayUnion<S5> >()); 241 EXPECT_EQ(alignOf<S6>(), alignOf<AlignedCharArrayUnion<S6> >()); 242 EXPECT_EQ(alignOf<D1>(), alignOf<AlignedCharArrayUnion<D1> >()); 243 EXPECT_EQ(alignOf<D2>(), alignOf<AlignedCharArrayUnion<D2> >()); 244 EXPECT_EQ(alignOf<D3>(), alignOf<AlignedCharArrayUnion<D3> >()); 245 EXPECT_EQ(alignOf<D4>(), alignOf<AlignedCharArrayUnion<D4> >()); 246 EXPECT_EQ(alignOf<D5>(), alignOf<AlignedCharArrayUnion<D5> >()); 247 EXPECT_EQ(alignOf<D6>(), alignOf<AlignedCharArrayUnion<D6> >()); 248 EXPECT_EQ(alignOf<D7>(), alignOf<AlignedCharArrayUnion<D7> >()); 249 EXPECT_EQ(alignOf<D8>(), alignOf<AlignedCharArrayUnion<D8> >()); 250 EXPECT_EQ(alignOf<D9>(), alignOf<AlignedCharArrayUnion<D9> >()); 251 EXPECT_EQ(alignOf<V1>(), alignOf<AlignedCharArrayUnion<V1> >()); 252 EXPECT_EQ(alignOf<V2>(), alignOf<AlignedCharArrayUnion<V2> >()); 253 EXPECT_EQ(alignOf<V3>(), alignOf<AlignedCharArrayUnion<V3> >()); 254 EXPECT_EQ(alignOf<V4>(), alignOf<AlignedCharArrayUnion<V4> >()); 255 EXPECT_EQ(alignOf<V5>(), alignOf<AlignedCharArrayUnion<V5> >()); 256 EXPECT_EQ(alignOf<V6>(), alignOf<AlignedCharArrayUnion<V6> >()); 257 EXPECT_EQ(alignOf<V7>(), alignOf<AlignedCharArrayUnion<V7> >()); 258 259 // Some versions of MSVC get this wrong somewhat disturbingly. The failure 260 // appears to be benign: alignOf<V8>() produces a preposterous value: 12 261 #ifndef _MSC_VER 262 EXPECT_EQ(alignOf<V8>(), alignOf<AlignedCharArrayUnion<V8> >()); 263 #endif 264 265 EXPECT_EQ(sizeof(char), sizeof(AlignedCharArrayUnion<char>)); 266 EXPECT_EQ(sizeof(char[1]), sizeof(AlignedCharArrayUnion<char[1]>)); 267 EXPECT_EQ(sizeof(char[2]), sizeof(AlignedCharArrayUnion<char[2]>)); 268 EXPECT_EQ(sizeof(char[3]), sizeof(AlignedCharArrayUnion<char[3]>)); 269 EXPECT_EQ(sizeof(char[4]), sizeof(AlignedCharArrayUnion<char[4]>)); 270 EXPECT_EQ(sizeof(char[5]), sizeof(AlignedCharArrayUnion<char[5]>)); 271 EXPECT_EQ(sizeof(char[8]), sizeof(AlignedCharArrayUnion<char[8]>)); 272 EXPECT_EQ(sizeof(char[13]), sizeof(AlignedCharArrayUnion<char[13]>)); 273 EXPECT_EQ(sizeof(char[16]), sizeof(AlignedCharArrayUnion<char[16]>)); 274 EXPECT_EQ(sizeof(char[21]), sizeof(AlignedCharArrayUnion<char[21]>)); 275 EXPECT_EQ(sizeof(char[32]), sizeof(AlignedCharArrayUnion<char[32]>)); 276 EXPECT_EQ(sizeof(short), sizeof(AlignedCharArrayUnion<short>)); 277 EXPECT_EQ(sizeof(int), sizeof(AlignedCharArrayUnion<int>)); 278 EXPECT_EQ(sizeof(long), sizeof(AlignedCharArrayUnion<long>)); 279 EXPECT_EQ(sizeof(long long), 280 sizeof(AlignedCharArrayUnion<long long>)); 281 EXPECT_EQ(sizeof(float), sizeof(AlignedCharArrayUnion<float>)); 282 EXPECT_EQ(sizeof(double), sizeof(AlignedCharArrayUnion<double>)); 283 EXPECT_EQ(sizeof(long double), 284 sizeof(AlignedCharArrayUnion<long double>)); 285 EXPECT_EQ(sizeof(void *), sizeof(AlignedCharArrayUnion<void *>)); 286 EXPECT_EQ(sizeof(int *), sizeof(AlignedCharArrayUnion<int *>)); 287 EXPECT_EQ(sizeof(double (*)(double)), 288 sizeof(AlignedCharArrayUnion<double (*)(double)>)); 289 EXPECT_EQ(sizeof(double (S6::*)()), 290 sizeof(AlignedCharArrayUnion<double (S6::*)()>)); 291 EXPECT_EQ(sizeof(S1), sizeof(AlignedCharArrayUnion<S1>)); 292 EXPECT_EQ(sizeof(S2), sizeof(AlignedCharArrayUnion<S2>)); 293 EXPECT_EQ(sizeof(S3), sizeof(AlignedCharArrayUnion<S3>)); 294 EXPECT_EQ(sizeof(S4), sizeof(AlignedCharArrayUnion<S4>)); 295 EXPECT_EQ(sizeof(S5), sizeof(AlignedCharArrayUnion<S5>)); 296 EXPECT_EQ(sizeof(S6), sizeof(AlignedCharArrayUnion<S6>)); 297 EXPECT_EQ(sizeof(D1), sizeof(AlignedCharArrayUnion<D1>)); 298 EXPECT_EQ(sizeof(D2), sizeof(AlignedCharArrayUnion<D2>)); 299 EXPECT_EQ(sizeof(D3), sizeof(AlignedCharArrayUnion<D3>)); 300 EXPECT_EQ(sizeof(D4), sizeof(AlignedCharArrayUnion<D4>)); 301 EXPECT_EQ(sizeof(D5), sizeof(AlignedCharArrayUnion<D5>)); 302 EXPECT_EQ(sizeof(D6), sizeof(AlignedCharArrayUnion<D6>)); 303 EXPECT_EQ(sizeof(D7), sizeof(AlignedCharArrayUnion<D7>)); 304 EXPECT_EQ(sizeof(D8), sizeof(AlignedCharArrayUnion<D8>)); 305 EXPECT_EQ(sizeof(D9), sizeof(AlignedCharArrayUnion<D9>)); 306 EXPECT_EQ(sizeof(D9[1]), sizeof(AlignedCharArrayUnion<D9[1]>)); 307 EXPECT_EQ(sizeof(D9[2]), sizeof(AlignedCharArrayUnion<D9[2]>)); 308 EXPECT_EQ(sizeof(D9[3]), sizeof(AlignedCharArrayUnion<D9[3]>)); 309 EXPECT_EQ(sizeof(D9[4]), sizeof(AlignedCharArrayUnion<D9[4]>)); 310 EXPECT_EQ(sizeof(D9[5]), sizeof(AlignedCharArrayUnion<D9[5]>)); 311 EXPECT_EQ(sizeof(D9[8]), sizeof(AlignedCharArrayUnion<D9[8]>)); 312 EXPECT_EQ(sizeof(D9[13]), sizeof(AlignedCharArrayUnion<D9[13]>)); 313 EXPECT_EQ(sizeof(D9[16]), sizeof(AlignedCharArrayUnion<D9[16]>)); 314 EXPECT_EQ(sizeof(D9[21]), sizeof(AlignedCharArrayUnion<D9[21]>)); 315 EXPECT_EQ(sizeof(D9[32]), sizeof(AlignedCharArrayUnion<D9[32]>)); 316 EXPECT_EQ(sizeof(V1), sizeof(AlignedCharArrayUnion<V1>)); 317 EXPECT_EQ(sizeof(V2), sizeof(AlignedCharArrayUnion<V2>)); 318 EXPECT_EQ(sizeof(V3), sizeof(AlignedCharArrayUnion<V3>)); 319 EXPECT_EQ(sizeof(V4), sizeof(AlignedCharArrayUnion<V4>)); 320 EXPECT_EQ(sizeof(V5), sizeof(AlignedCharArrayUnion<V5>)); 321 EXPECT_EQ(sizeof(V6), sizeof(AlignedCharArrayUnion<V6>)); 322 EXPECT_EQ(sizeof(V7), sizeof(AlignedCharArrayUnion<V7>)); 323 324 // Some versions of MSVC also get this wrong. The failure again appears to be 325 // benign: sizeof(V8) is only 52 bytes, but our array reserves 56. 326 #ifndef _MSC_VER 327 EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>)); 328 #endif 329 330 EXPECT_EQ(1u, (alignOf<AlignedCharArray<1, 1> >())); 331 EXPECT_EQ(2u, (alignOf<AlignedCharArray<2, 1> >())); 332 EXPECT_EQ(4u, (alignOf<AlignedCharArray<4, 1> >())); 333 EXPECT_EQ(8u, (alignOf<AlignedCharArray<8, 1> >())); 334 EXPECT_EQ(16u, (alignOf<AlignedCharArray<16, 1> >())); 335 336 EXPECT_EQ(1u, sizeof(AlignedCharArray<1, 1>)); 337 EXPECT_EQ(7u, sizeof(AlignedCharArray<1, 7>)); 338 EXPECT_EQ(2u, sizeof(AlignedCharArray<2, 2>)); 339 EXPECT_EQ(16u, sizeof(AlignedCharArray<2, 16>)); 340 } 341 } 342