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 struct LLVM_ALIGNAS(1) A1 {}; 43 struct LLVM_ALIGNAS(2) A2 {}; 44 struct LLVM_ALIGNAS(4) A4 {}; 45 struct LLVM_ALIGNAS(8) A8 {}; 46 47 struct S1 {}; 48 struct S2 { char a; }; 49 struct S3 { int x; }; 50 struct S4 { double y; }; 51 struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; }; 52 struct S6 { double f(); }; 53 struct D1 : S1 {}; 54 struct D2 : S6 { float g(); }; 55 struct D3 : S2 {}; 56 struct D4 : S2 { int x; }; 57 struct D5 : S3 { char c; }; 58 struct D6 : S2, S3 {}; 59 struct D7 : S1, S3 {}; 60 struct D8 : S1, D4, D5 { double x[2]; }; 61 struct D9 : S1, D1 { S1 s1; }; 62 struct V1 { virtual ~V1(); }; 63 struct V2 { int x; virtual ~V2(); }; 64 struct V3 : V1 { 65 ~V3() override; 66 }; 67 struct V4 : virtual V2 { int y; 68 ~V4() override; 69 }; 70 struct V5 : V4, V3 { double z; 71 ~V5() override; 72 }; 73 struct V6 : S1 { virtual ~V6(); }; 74 struct V7 : virtual V2, virtual V6 { 75 ~V7() override; 76 }; 77 struct V8 : V5, virtual V6, V7 { double zz; 78 ~V8() override; 79 }; 80 81 double S6::f() { return 0.0; } 82 float D2::g() { return 0.0f; } 83 V1::~V1() {} 84 V2::~V2() {} 85 V3::~V3() {} 86 V4::~V4() {} 87 V5::~V5() {} 88 V6::~V6() {} 89 V7::~V7() {} 90 V8::~V8() {} 91 92 template <typename M> struct T { M m; }; 93 94 typedef uint8_t t1; 95 typedef uint16_t t2; 96 typedef uint32_t t3; 97 typedef uint64_t t4; 98 typedef int8_t t5; 99 typedef int16_t t6; 100 typedef int32_t t7; 101 typedef int64_t t8; 102 typedef struct { uint8_t bytes[16]; } t9; 103 typedef struct { uint16_t words[16]; } t10; 104 typedef struct { uint32_t words[16]; } t11; 105 typedef struct { uint64_t words[16]; } t12; 106 107 typedef AlignedCharArrayUnion<t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12> U; 108 109 static_assert(sizeof(U) == sizeof(uint64_t[16]), "Statically-computed size must be right"); 110 static_assert(alignof(U) == alignof(uint64_t), "Statically-computed alignment must be right"); 111 112 TEST(AlignOfTest, BasicAlignedArray) { 113 EXPECT_LE(1u, alignof(AlignedCharArrayUnion<A1>)); 114 EXPECT_LE(2u, alignof(AlignedCharArrayUnion<A2>)); 115 EXPECT_LE(4u, alignof(AlignedCharArrayUnion<A4>)); 116 EXPECT_LE(8u, alignof(AlignedCharArrayUnion<A8>)); 117 118 EXPECT_LE(1u, sizeof(AlignedCharArrayUnion<A1>)); 119 EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<A2>)); 120 EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<A4>)); 121 EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<A8>)); 122 123 EXPECT_EQ(1u, (alignof(AlignedCharArrayUnion<A1>))); 124 EXPECT_EQ(2u, (alignof(AlignedCharArrayUnion<A1, A2>))); 125 EXPECT_EQ(4u, (alignof(AlignedCharArrayUnion<A1, A2, A4>))); 126 EXPECT_EQ(8u, (alignof(AlignedCharArrayUnion<A1, A2, A4, A8>))); 127 128 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1>)); 129 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1, A2>)); 130 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1, A2, A4>)); 131 EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<A1, A2, A4, A8>)); 132 133 EXPECT_EQ(1u, (alignof(AlignedCharArrayUnion<A1[1]>))); 134 EXPECT_EQ(2u, (alignof(AlignedCharArrayUnion<A1[2], A2[1]>))); 135 EXPECT_EQ(4u, (alignof(AlignedCharArrayUnion<A1[42], A2[55], A4[13]>))); 136 EXPECT_EQ(8u, (alignof(AlignedCharArrayUnion<A1[2], A2[1], A4, A8>))); 137 138 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1[1]>)); 139 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1[2], A2[1]>)); 140 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1[3], A2[2], A4>)); 141 EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<A1, A2[3], 142 A4[3], A8>)); 143 144 // For other tests we simply assert that the alignment of the union mathes 145 // that of the fundamental type and hope that we have any weird type 146 // productions that would trigger bugs. 147 EXPECT_EQ(alignof(T<char>), alignof(AlignedCharArrayUnion<char>)); 148 EXPECT_EQ(alignof(T<short>), alignof(AlignedCharArrayUnion<short>)); 149 EXPECT_EQ(alignof(T<int>), alignof(AlignedCharArrayUnion<int>)); 150 EXPECT_EQ(alignof(T<long>), alignof(AlignedCharArrayUnion<long>)); 151 EXPECT_EQ(alignof(T<long long>), alignof(AlignedCharArrayUnion<long long>)); 152 EXPECT_EQ(alignof(T<float>), alignof(AlignedCharArrayUnion<float>)); 153 EXPECT_EQ(alignof(T<double>), alignof(AlignedCharArrayUnion<double>)); 154 EXPECT_EQ(alignof(T<long double>), 155 alignof(AlignedCharArrayUnion<long double>)); 156 EXPECT_EQ(alignof(T<void *>), alignof(AlignedCharArrayUnion<void *>)); 157 EXPECT_EQ(alignof(T<int *>), alignof(AlignedCharArrayUnion<int *>)); 158 EXPECT_EQ(alignof(T<double (*)(double)>), 159 alignof(AlignedCharArrayUnion<double (*)(double)>)); 160 EXPECT_EQ(alignof(T<double (S6::*)()>), 161 alignof(AlignedCharArrayUnion<double (S6::*)()>)); 162 EXPECT_EQ(alignof(S1), alignof(AlignedCharArrayUnion<S1>)); 163 EXPECT_EQ(alignof(S2), alignof(AlignedCharArrayUnion<S2>)); 164 EXPECT_EQ(alignof(S3), alignof(AlignedCharArrayUnion<S3>)); 165 EXPECT_EQ(alignof(S4), alignof(AlignedCharArrayUnion<S4>)); 166 EXPECT_EQ(alignof(S5), alignof(AlignedCharArrayUnion<S5>)); 167 EXPECT_EQ(alignof(S6), alignof(AlignedCharArrayUnion<S6>)); 168 EXPECT_EQ(alignof(D1), alignof(AlignedCharArrayUnion<D1>)); 169 EXPECT_EQ(alignof(D2), alignof(AlignedCharArrayUnion<D2>)); 170 EXPECT_EQ(alignof(D3), alignof(AlignedCharArrayUnion<D3>)); 171 EXPECT_EQ(alignof(D4), alignof(AlignedCharArrayUnion<D4>)); 172 EXPECT_EQ(alignof(D5), alignof(AlignedCharArrayUnion<D5>)); 173 EXPECT_EQ(alignof(D6), alignof(AlignedCharArrayUnion<D6>)); 174 EXPECT_EQ(alignof(D7), alignof(AlignedCharArrayUnion<D7>)); 175 EXPECT_EQ(alignof(D8), alignof(AlignedCharArrayUnion<D8>)); 176 EXPECT_EQ(alignof(D9), alignof(AlignedCharArrayUnion<D9>)); 177 EXPECT_EQ(alignof(V1), alignof(AlignedCharArrayUnion<V1>)); 178 EXPECT_EQ(alignof(V2), alignof(AlignedCharArrayUnion<V2>)); 179 EXPECT_EQ(alignof(V3), alignof(AlignedCharArrayUnion<V3>)); 180 EXPECT_EQ(alignof(V4), alignof(AlignedCharArrayUnion<V4>)); 181 EXPECT_EQ(alignof(V5), alignof(AlignedCharArrayUnion<V5>)); 182 EXPECT_EQ(alignof(V6), alignof(AlignedCharArrayUnion<V6>)); 183 EXPECT_EQ(alignof(V7), alignof(AlignedCharArrayUnion<V7>)); 184 185 // Some versions of MSVC get this wrong somewhat disturbingly. The failure 186 // appears to be benign: alignof(V8) produces a preposterous value: 12 187 #ifndef _MSC_VER 188 EXPECT_EQ(alignof(V8), alignof(AlignedCharArrayUnion<V8>)); 189 #endif 190 191 EXPECT_EQ(sizeof(char), sizeof(AlignedCharArrayUnion<char>)); 192 EXPECT_EQ(sizeof(char[1]), sizeof(AlignedCharArrayUnion<char[1]>)); 193 EXPECT_EQ(sizeof(char[2]), sizeof(AlignedCharArrayUnion<char[2]>)); 194 EXPECT_EQ(sizeof(char[3]), sizeof(AlignedCharArrayUnion<char[3]>)); 195 EXPECT_EQ(sizeof(char[4]), sizeof(AlignedCharArrayUnion<char[4]>)); 196 EXPECT_EQ(sizeof(char[5]), sizeof(AlignedCharArrayUnion<char[5]>)); 197 EXPECT_EQ(sizeof(char[8]), sizeof(AlignedCharArrayUnion<char[8]>)); 198 EXPECT_EQ(sizeof(char[13]), sizeof(AlignedCharArrayUnion<char[13]>)); 199 EXPECT_EQ(sizeof(char[16]), sizeof(AlignedCharArrayUnion<char[16]>)); 200 EXPECT_EQ(sizeof(char[21]), sizeof(AlignedCharArrayUnion<char[21]>)); 201 EXPECT_EQ(sizeof(char[32]), sizeof(AlignedCharArrayUnion<char[32]>)); 202 EXPECT_EQ(sizeof(short), sizeof(AlignedCharArrayUnion<short>)); 203 EXPECT_EQ(sizeof(int), sizeof(AlignedCharArrayUnion<int>)); 204 EXPECT_EQ(sizeof(long), sizeof(AlignedCharArrayUnion<long>)); 205 EXPECT_EQ(sizeof(long long), 206 sizeof(AlignedCharArrayUnion<long long>)); 207 EXPECT_EQ(sizeof(float), sizeof(AlignedCharArrayUnion<float>)); 208 EXPECT_EQ(sizeof(double), sizeof(AlignedCharArrayUnion<double>)); 209 EXPECT_EQ(sizeof(long double), 210 sizeof(AlignedCharArrayUnion<long double>)); 211 EXPECT_EQ(sizeof(void *), sizeof(AlignedCharArrayUnion<void *>)); 212 EXPECT_EQ(sizeof(int *), sizeof(AlignedCharArrayUnion<int *>)); 213 EXPECT_EQ(sizeof(double (*)(double)), 214 sizeof(AlignedCharArrayUnion<double (*)(double)>)); 215 EXPECT_EQ(sizeof(double (S6::*)()), 216 sizeof(AlignedCharArrayUnion<double (S6::*)()>)); 217 EXPECT_EQ(sizeof(S1), sizeof(AlignedCharArrayUnion<S1>)); 218 EXPECT_EQ(sizeof(S2), sizeof(AlignedCharArrayUnion<S2>)); 219 EXPECT_EQ(sizeof(S3), sizeof(AlignedCharArrayUnion<S3>)); 220 EXPECT_EQ(sizeof(S4), sizeof(AlignedCharArrayUnion<S4>)); 221 EXPECT_EQ(sizeof(S5), sizeof(AlignedCharArrayUnion<S5>)); 222 EXPECT_EQ(sizeof(S6), sizeof(AlignedCharArrayUnion<S6>)); 223 EXPECT_EQ(sizeof(D1), sizeof(AlignedCharArrayUnion<D1>)); 224 EXPECT_EQ(sizeof(D2), sizeof(AlignedCharArrayUnion<D2>)); 225 EXPECT_EQ(sizeof(D3), sizeof(AlignedCharArrayUnion<D3>)); 226 EXPECT_EQ(sizeof(D4), sizeof(AlignedCharArrayUnion<D4>)); 227 EXPECT_EQ(sizeof(D5), sizeof(AlignedCharArrayUnion<D5>)); 228 EXPECT_EQ(sizeof(D6), sizeof(AlignedCharArrayUnion<D6>)); 229 EXPECT_EQ(sizeof(D7), sizeof(AlignedCharArrayUnion<D7>)); 230 EXPECT_EQ(sizeof(D8), sizeof(AlignedCharArrayUnion<D8>)); 231 EXPECT_EQ(sizeof(D9), sizeof(AlignedCharArrayUnion<D9>)); 232 EXPECT_EQ(sizeof(D9[1]), sizeof(AlignedCharArrayUnion<D9[1]>)); 233 EXPECT_EQ(sizeof(D9[2]), sizeof(AlignedCharArrayUnion<D9[2]>)); 234 EXPECT_EQ(sizeof(D9[3]), sizeof(AlignedCharArrayUnion<D9[3]>)); 235 EXPECT_EQ(sizeof(D9[4]), sizeof(AlignedCharArrayUnion<D9[4]>)); 236 EXPECT_EQ(sizeof(D9[5]), sizeof(AlignedCharArrayUnion<D9[5]>)); 237 EXPECT_EQ(sizeof(D9[8]), sizeof(AlignedCharArrayUnion<D9[8]>)); 238 EXPECT_EQ(sizeof(D9[13]), sizeof(AlignedCharArrayUnion<D9[13]>)); 239 EXPECT_EQ(sizeof(D9[16]), sizeof(AlignedCharArrayUnion<D9[16]>)); 240 EXPECT_EQ(sizeof(D9[21]), sizeof(AlignedCharArrayUnion<D9[21]>)); 241 EXPECT_EQ(sizeof(D9[32]), sizeof(AlignedCharArrayUnion<D9[32]>)); 242 EXPECT_EQ(sizeof(V1), sizeof(AlignedCharArrayUnion<V1>)); 243 EXPECT_EQ(sizeof(V2), sizeof(AlignedCharArrayUnion<V2>)); 244 EXPECT_EQ(sizeof(V3), sizeof(AlignedCharArrayUnion<V3>)); 245 EXPECT_EQ(sizeof(V4), sizeof(AlignedCharArrayUnion<V4>)); 246 EXPECT_EQ(sizeof(V5), sizeof(AlignedCharArrayUnion<V5>)); 247 EXPECT_EQ(sizeof(V6), sizeof(AlignedCharArrayUnion<V6>)); 248 EXPECT_EQ(sizeof(V7), sizeof(AlignedCharArrayUnion<V7>)); 249 250 // Some versions of MSVC also get this wrong. The failure again appears to be 251 // benign: sizeof(V8) is only 52 bytes, but our array reserves 56. 252 #ifndef _MSC_VER 253 EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>)); 254 #endif 255 256 EXPECT_EQ(1u, (alignof(AlignedCharArray<1, 1>))); 257 EXPECT_EQ(2u, (alignof(AlignedCharArray<2, 1>))); 258 EXPECT_EQ(4u, (alignof(AlignedCharArray<4, 1>))); 259 EXPECT_EQ(8u, (alignof(AlignedCharArray<8, 1>))); 260 EXPECT_EQ(16u, (alignof(AlignedCharArray<16, 1>))); 261 262 EXPECT_EQ(1u, sizeof(AlignedCharArray<1, 1>)); 263 EXPECT_EQ(7u, sizeof(AlignedCharArray<1, 7>)); 264 EXPECT_EQ(2u, sizeof(AlignedCharArray<2, 2>)); 265 EXPECT_EQ(16u, sizeof(AlignedCharArray<2, 16>)); 266 } 267 } // end anonymous namespace 268