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