1 //=== - llvm/unittest/Support/AlignOfTest.cpp - Alignment utility tests ----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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)
16 #include "llvm/Support/AlignOf.h"
17 #include "llvm/Support/Compiler.h"
18 #include "gtest/gtest.h"
23 // Disable warnings about questionable type definitions.
24 // We're testing that even questionable types work with the alignment utilities.
26 #pragma warning(disable:4584)
29 // Suppress direct base '{anonymous}::S1' inaccessible in '{anonymous}::D9'
30 // due to ambiguity warning.
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"
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 {};
48 struct S2 { char a; };
50 struct S4 { double y; };
51 struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; };
52 struct S6 { double f(); };
54 struct D2 : S6 { float g(); };
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 { virtual ~V3(); };
65 struct V4 : virtual V2 { int y; virtual ~V4(); };
66 struct V5 : V4, V3 { double z; virtual ~V5(); };
67 struct V6 : S1 { virtual ~V6(); };
68 struct V7 : virtual V2, virtual V6 { virtual ~V7(); };
69 struct V8 : V5, virtual V6, V7 { double zz; virtual ~V8(); };
71 double S6::f() { return 0.0; }
72 float D2::g() { return 0.0f; }
82 // Ensure alignment is a compile-time constant.
83 char LLVM_ATTRIBUTE_UNUSED test_arr1
84 [AlignOf<char>::Alignment > 0]
85 [AlignOf<short>::Alignment > 0]
86 [AlignOf<int>::Alignment > 0]
87 [AlignOf<long>::Alignment > 0]
88 [AlignOf<long long>::Alignment > 0]
89 [AlignOf<float>::Alignment > 0]
90 [AlignOf<double>::Alignment > 0]
91 [AlignOf<long double>::Alignment > 0]
92 [AlignOf<void *>::Alignment > 0]
93 [AlignOf<int *>::Alignment > 0]
94 [AlignOf<double (*)(double)>::Alignment > 0]
95 [AlignOf<double (S6::*)()>::Alignment > 0];
96 char LLVM_ATTRIBUTE_UNUSED test_arr2
97 [AlignOf<A1>::Alignment > 0]
98 [AlignOf<A2>::Alignment > 0]
99 [AlignOf<A4>::Alignment > 0]
100 [AlignOf<A8>::Alignment > 0];
101 char LLVM_ATTRIBUTE_UNUSED test_arr3
102 [AlignOf<S1>::Alignment > 0]
103 [AlignOf<S2>::Alignment > 0]
104 [AlignOf<S3>::Alignment > 0]
105 [AlignOf<S4>::Alignment > 0]
106 [AlignOf<S5>::Alignment > 0]
107 [AlignOf<S6>::Alignment > 0];
108 char LLVM_ATTRIBUTE_UNUSED test_arr4
109 [AlignOf<D1>::Alignment > 0]
110 [AlignOf<D2>::Alignment > 0]
111 [AlignOf<D3>::Alignment > 0]
112 [AlignOf<D4>::Alignment > 0]
113 [AlignOf<D5>::Alignment > 0]
114 [AlignOf<D6>::Alignment > 0]
115 [AlignOf<D7>::Alignment > 0]
116 [AlignOf<D8>::Alignment > 0]
117 [AlignOf<D9>::Alignment > 0];
118 char LLVM_ATTRIBUTE_UNUSED test_arr5
119 [AlignOf<V1>::Alignment > 0]
120 [AlignOf<V2>::Alignment > 0]
121 [AlignOf<V3>::Alignment > 0]
122 [AlignOf<V4>::Alignment > 0]
123 [AlignOf<V5>::Alignment > 0]
124 [AlignOf<V6>::Alignment > 0]
125 [AlignOf<V7>::Alignment > 0]
126 [AlignOf<V8>::Alignment > 0];
128 TEST(AlignOfTest, BasicAlignmentInvariants) {
129 EXPECT_LE(1u, alignOf<A1>());
130 EXPECT_LE(2u, alignOf<A2>());
131 EXPECT_LE(4u, alignOf<A4>());
132 EXPECT_LE(8u, alignOf<A8>());
134 EXPECT_EQ(1u, alignOf<char>());
135 EXPECT_LE(alignOf<char>(), alignOf<short>());
136 EXPECT_LE(alignOf<short>(), alignOf<int>());
137 EXPECT_LE(alignOf<int>(), alignOf<long>());
138 EXPECT_LE(alignOf<long>(), alignOf<long long>());
139 EXPECT_LE(alignOf<char>(), alignOf<float>());
140 EXPECT_LE(alignOf<float>(), alignOf<double>());
141 EXPECT_LE(alignOf<char>(), alignOf<long double>());
142 EXPECT_LE(alignOf<char>(), alignOf<void *>());
143 EXPECT_EQ(alignOf<void *>(), alignOf<int *>());
144 EXPECT_LE(alignOf<char>(), alignOf<S1>());
145 EXPECT_LE(alignOf<S1>(), alignOf<S2>());
146 EXPECT_LE(alignOf<S1>(), alignOf<S3>());
147 EXPECT_LE(alignOf<S1>(), alignOf<S4>());
148 EXPECT_LE(alignOf<S1>(), alignOf<S5>());
149 EXPECT_LE(alignOf<S1>(), alignOf<S6>());
150 EXPECT_LE(alignOf<S1>(), alignOf<D1>());
151 EXPECT_LE(alignOf<S1>(), alignOf<D2>());
152 EXPECT_LE(alignOf<S1>(), alignOf<D3>());
153 EXPECT_LE(alignOf<S1>(), alignOf<D4>());
154 EXPECT_LE(alignOf<S1>(), alignOf<D5>());
155 EXPECT_LE(alignOf<S1>(), alignOf<D6>());
156 EXPECT_LE(alignOf<S1>(), alignOf<D7>());
157 EXPECT_LE(alignOf<S1>(), alignOf<D8>());
158 EXPECT_LE(alignOf<S1>(), alignOf<D9>());
159 EXPECT_LE(alignOf<S1>(), alignOf<V1>());
160 EXPECT_LE(alignOf<V1>(), alignOf<V2>());
161 EXPECT_LE(alignOf<V1>(), alignOf<V3>());
162 EXPECT_LE(alignOf<V1>(), alignOf<V4>());
163 EXPECT_LE(alignOf<V1>(), alignOf<V5>());
164 EXPECT_LE(alignOf<V1>(), alignOf<V6>());
165 EXPECT_LE(alignOf<V1>(), alignOf<V7>());
166 EXPECT_LE(alignOf<V1>(), alignOf<V8>());
169 TEST(AlignOfTest, BasicAlignedArray) {
170 EXPECT_LE(1u, alignOf<AlignedCharArrayUnion<A1> >());
171 EXPECT_LE(2u, alignOf<AlignedCharArrayUnion<A2> >());
172 EXPECT_LE(4u, alignOf<AlignedCharArrayUnion<A4> >());
173 EXPECT_LE(8u, alignOf<AlignedCharArrayUnion<A8> >());
175 EXPECT_LE(1u, sizeof(AlignedCharArrayUnion<A1>));
176 EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<A2>));
177 EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<A4>));
178 EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<A8>));
180 EXPECT_EQ(1u, (alignOf<AlignedCharArrayUnion<A1> >()));
181 EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<A1, A2> >()));
182 EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<A1, A2, A4> >()));
183 EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<A1, A2, A4, A8> >()));
185 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1>));
186 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1, A2>));
187 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1, A2, A4>));
188 EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<A1, A2, A4, A8>));
190 EXPECT_EQ(1u, (alignOf<AlignedCharArrayUnion<A1[1]> >()));
191 EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<A1[2], A2[1]> >()));
192 EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<A1[42], A2[55],
194 EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<A1[2], A2[1],
197 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1[1]>));
198 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1[2], A2[1]>));
199 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1[3], A2[2], A4>));
200 EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<A1, A2[3],
203 // For other tests we simply assert that the alignment of the union mathes
204 // that of the fundamental type and hope that we have any weird type
205 // productions that would trigger bugs.
206 EXPECT_EQ(alignOf<char>(), alignOf<AlignedCharArrayUnion<char> >());
207 EXPECT_EQ(alignOf<short>(), alignOf<AlignedCharArrayUnion<short> >());
208 EXPECT_EQ(alignOf<int>(), alignOf<AlignedCharArrayUnion<int> >());
209 EXPECT_EQ(alignOf<long>(), alignOf<AlignedCharArrayUnion<long> >());
210 EXPECT_EQ(alignOf<long long>(),
211 alignOf<AlignedCharArrayUnion<long long> >());
212 EXPECT_EQ(alignOf<float>(), alignOf<AlignedCharArrayUnion<float> >());
213 EXPECT_EQ(alignOf<double>(), alignOf<AlignedCharArrayUnion<double> >());
214 EXPECT_EQ(alignOf<long double>(),
215 alignOf<AlignedCharArrayUnion<long double> >());
216 EXPECT_EQ(alignOf<void *>(), alignOf<AlignedCharArrayUnion<void *> >());
217 EXPECT_EQ(alignOf<int *>(), alignOf<AlignedCharArrayUnion<int *> >());
218 EXPECT_EQ(alignOf<double (*)(double)>(),
219 alignOf<AlignedCharArrayUnion<double (*)(double)> >());
220 EXPECT_EQ(alignOf<double (S6::*)()>(),
221 alignOf<AlignedCharArrayUnion<double (S6::*)()> >());
222 EXPECT_EQ(alignOf<S1>(), alignOf<AlignedCharArrayUnion<S1> >());
223 EXPECT_EQ(alignOf<S2>(), alignOf<AlignedCharArrayUnion<S2> >());
224 EXPECT_EQ(alignOf<S3>(), alignOf<AlignedCharArrayUnion<S3> >());
225 EXPECT_EQ(alignOf<S4>(), alignOf<AlignedCharArrayUnion<S4> >());
226 EXPECT_EQ(alignOf<S5>(), alignOf<AlignedCharArrayUnion<S5> >());
227 EXPECT_EQ(alignOf<S6>(), alignOf<AlignedCharArrayUnion<S6> >());
228 EXPECT_EQ(alignOf<D1>(), alignOf<AlignedCharArrayUnion<D1> >());
229 EXPECT_EQ(alignOf<D2>(), alignOf<AlignedCharArrayUnion<D2> >());
230 EXPECT_EQ(alignOf<D3>(), alignOf<AlignedCharArrayUnion<D3> >());
231 EXPECT_EQ(alignOf<D4>(), alignOf<AlignedCharArrayUnion<D4> >());
232 EXPECT_EQ(alignOf<D5>(), alignOf<AlignedCharArrayUnion<D5> >());
233 EXPECT_EQ(alignOf<D6>(), alignOf<AlignedCharArrayUnion<D6> >());
234 EXPECT_EQ(alignOf<D7>(), alignOf<AlignedCharArrayUnion<D7> >());
235 EXPECT_EQ(alignOf<D8>(), alignOf<AlignedCharArrayUnion<D8> >());
236 EXPECT_EQ(alignOf<D9>(), alignOf<AlignedCharArrayUnion<D9> >());
237 EXPECT_EQ(alignOf<V1>(), alignOf<AlignedCharArrayUnion<V1> >());
238 EXPECT_EQ(alignOf<V2>(), alignOf<AlignedCharArrayUnion<V2> >());
239 EXPECT_EQ(alignOf<V3>(), alignOf<AlignedCharArrayUnion<V3> >());
240 EXPECT_EQ(alignOf<V4>(), alignOf<AlignedCharArrayUnion<V4> >());
241 EXPECT_EQ(alignOf<V5>(), alignOf<AlignedCharArrayUnion<V5> >());
242 EXPECT_EQ(alignOf<V6>(), alignOf<AlignedCharArrayUnion<V6> >());
243 EXPECT_EQ(alignOf<V7>(), alignOf<AlignedCharArrayUnion<V7> >());
245 // Some versions of MSVC get this wrong somewhat disturbingly. The failure
246 // appears to be benign: alignOf<V8>() produces a preposterous value: 12
248 EXPECT_EQ(alignOf<V8>(), alignOf<AlignedCharArrayUnion<V8> >());
251 EXPECT_EQ(sizeof(char), sizeof(AlignedCharArrayUnion<char>));
252 EXPECT_EQ(sizeof(char[1]), sizeof(AlignedCharArrayUnion<char[1]>));
253 EXPECT_EQ(sizeof(char[2]), sizeof(AlignedCharArrayUnion<char[2]>));
254 EXPECT_EQ(sizeof(char[3]), sizeof(AlignedCharArrayUnion<char[3]>));
255 EXPECT_EQ(sizeof(char[4]), sizeof(AlignedCharArrayUnion<char[4]>));
256 EXPECT_EQ(sizeof(char[5]), sizeof(AlignedCharArrayUnion<char[5]>));
257 EXPECT_EQ(sizeof(char[8]), sizeof(AlignedCharArrayUnion<char[8]>));
258 EXPECT_EQ(sizeof(char[13]), sizeof(AlignedCharArrayUnion<char[13]>));
259 EXPECT_EQ(sizeof(char[16]), sizeof(AlignedCharArrayUnion<char[16]>));
260 EXPECT_EQ(sizeof(char[21]), sizeof(AlignedCharArrayUnion<char[21]>));
261 EXPECT_EQ(sizeof(char[32]), sizeof(AlignedCharArrayUnion<char[32]>));
262 EXPECT_EQ(sizeof(short), sizeof(AlignedCharArrayUnion<short>));
263 EXPECT_EQ(sizeof(int), sizeof(AlignedCharArrayUnion<int>));
264 EXPECT_EQ(sizeof(long), sizeof(AlignedCharArrayUnion<long>));
265 EXPECT_EQ(sizeof(long long),
266 sizeof(AlignedCharArrayUnion<long long>));
267 EXPECT_EQ(sizeof(float), sizeof(AlignedCharArrayUnion<float>));
268 EXPECT_EQ(sizeof(double), sizeof(AlignedCharArrayUnion<double>));
269 EXPECT_EQ(sizeof(long double),
270 sizeof(AlignedCharArrayUnion<long double>));
271 EXPECT_EQ(sizeof(void *), sizeof(AlignedCharArrayUnion<void *>));
272 EXPECT_EQ(sizeof(int *), sizeof(AlignedCharArrayUnion<int *>));
273 EXPECT_EQ(sizeof(double (*)(double)),
274 sizeof(AlignedCharArrayUnion<double (*)(double)>));
275 EXPECT_EQ(sizeof(double (S6::*)()),
276 sizeof(AlignedCharArrayUnion<double (S6::*)()>));
277 EXPECT_EQ(sizeof(S1), sizeof(AlignedCharArrayUnion<S1>));
278 EXPECT_EQ(sizeof(S2), sizeof(AlignedCharArrayUnion<S2>));
279 EXPECT_EQ(sizeof(S3), sizeof(AlignedCharArrayUnion<S3>));
280 EXPECT_EQ(sizeof(S4), sizeof(AlignedCharArrayUnion<S4>));
281 EXPECT_EQ(sizeof(S5), sizeof(AlignedCharArrayUnion<S5>));
282 EXPECT_EQ(sizeof(S6), sizeof(AlignedCharArrayUnion<S6>));
283 EXPECT_EQ(sizeof(D1), sizeof(AlignedCharArrayUnion<D1>));
284 EXPECT_EQ(sizeof(D2), sizeof(AlignedCharArrayUnion<D2>));
285 EXPECT_EQ(sizeof(D3), sizeof(AlignedCharArrayUnion<D3>));
286 EXPECT_EQ(sizeof(D4), sizeof(AlignedCharArrayUnion<D4>));
287 EXPECT_EQ(sizeof(D5), sizeof(AlignedCharArrayUnion<D5>));
288 EXPECT_EQ(sizeof(D6), sizeof(AlignedCharArrayUnion<D6>));
289 EXPECT_EQ(sizeof(D7), sizeof(AlignedCharArrayUnion<D7>));
290 EXPECT_EQ(sizeof(D8), sizeof(AlignedCharArrayUnion<D8>));
291 EXPECT_EQ(sizeof(D9), sizeof(AlignedCharArrayUnion<D9>));
292 EXPECT_EQ(sizeof(D9[1]), sizeof(AlignedCharArrayUnion<D9[1]>));
293 EXPECT_EQ(sizeof(D9[2]), sizeof(AlignedCharArrayUnion<D9[2]>));
294 EXPECT_EQ(sizeof(D9[3]), sizeof(AlignedCharArrayUnion<D9[3]>));
295 EXPECT_EQ(sizeof(D9[4]), sizeof(AlignedCharArrayUnion<D9[4]>));
296 EXPECT_EQ(sizeof(D9[5]), sizeof(AlignedCharArrayUnion<D9[5]>));
297 EXPECT_EQ(sizeof(D9[8]), sizeof(AlignedCharArrayUnion<D9[8]>));
298 EXPECT_EQ(sizeof(D9[13]), sizeof(AlignedCharArrayUnion<D9[13]>));
299 EXPECT_EQ(sizeof(D9[16]), sizeof(AlignedCharArrayUnion<D9[16]>));
300 EXPECT_EQ(sizeof(D9[21]), sizeof(AlignedCharArrayUnion<D9[21]>));
301 EXPECT_EQ(sizeof(D9[32]), sizeof(AlignedCharArrayUnion<D9[32]>));
302 EXPECT_EQ(sizeof(V1), sizeof(AlignedCharArrayUnion<V1>));
303 EXPECT_EQ(sizeof(V2), sizeof(AlignedCharArrayUnion<V2>));
304 EXPECT_EQ(sizeof(V3), sizeof(AlignedCharArrayUnion<V3>));
305 EXPECT_EQ(sizeof(V4), sizeof(AlignedCharArrayUnion<V4>));
306 EXPECT_EQ(sizeof(V5), sizeof(AlignedCharArrayUnion<V5>));
307 EXPECT_EQ(sizeof(V6), sizeof(AlignedCharArrayUnion<V6>));
308 EXPECT_EQ(sizeof(V7), sizeof(AlignedCharArrayUnion<V7>));
310 // Some versions of MSVC also get this wrong. The failure again appears to be
311 // benign: sizeof(V8) is only 52 bytes, but our array reserves 56.
313 EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>));
316 EXPECT_EQ(1u, (alignOf<AlignedCharArray<1, 1> >()));
317 EXPECT_EQ(2u, (alignOf<AlignedCharArray<2, 1> >()));
318 EXPECT_EQ(4u, (alignOf<AlignedCharArray<4, 1> >()));
319 EXPECT_EQ(8u, (alignOf<AlignedCharArray<8, 1> >()));
320 EXPECT_EQ(16u, (alignOf<AlignedCharArray<16, 1> >()));
322 EXPECT_EQ(1u, sizeof(AlignedCharArray<1, 1>));
323 EXPECT_EQ(7u, sizeof(AlignedCharArray<1, 7>));
324 EXPECT_EQ(2u, sizeof(AlignedCharArray<2, 2>));
325 EXPECT_EQ(16u, sizeof(AlignedCharArray<2, 16>));