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 //===----------------------------------------------------------------------===//
10 #include "llvm/Support/AlignOf.h"
11 #include "llvm/Support/Compiler.h"
13 #include "gtest/gtest.h"
19 // Disable warnings about questionable type definitions.
20 // We're testing that even questionable types work with the alignment utilities.
22 #pragma warning(disable:4584)
25 // Define some fixed alignment types to use in these tests.
26 #if __has_feature(cxx_alignas)
27 struct alignas(1) A1 { };
28 struct alignas(2) A2 { };
29 struct alignas(4) A4 { };
30 struct alignas(8) A8 { };
31 #elif defined(__GNUC__)
32 struct A1 { } __attribute__((aligned(1)));
33 struct A2 { } __attribute__((aligned(2)));
34 struct A4 { } __attribute__((aligned(4)));
35 struct 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 { };
42 # error No supported align as directive.
46 struct S2 { char a; };
48 struct S4 { double y; };
49 struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; };
50 struct S6 { double f(); };
52 struct D2 : S6 { float g(); };
54 struct D4 : S2 { int x; };
55 struct D5 : S3 { char c; };
56 struct D6 : S2, S3 {};
57 struct D7 : S1, S3 {};
58 struct D8 : S1, D4, D5 { double x[2]; };
59 struct D9 : S1, D1 { S1 s1; };
60 struct V1 { virtual ~V1(); };
61 struct V2 { int x; virtual ~V2(); };
62 struct V3 : V1 { virtual ~V3(); };
63 struct V4 : virtual V2 { int y; virtual ~V4(); };
64 struct V5 : V4, V3 { double z; virtual ~V5(); };
65 struct V6 : S1 { virtual ~V6(); };
66 struct V7 : virtual V2, virtual V6 { virtual ~V7(); };
67 struct V8 : V5, virtual V6, V7 { double zz; virtual ~V8(); };
69 double S6::f() { return 0.0; }
70 float D2::g() { return 0.0f; }
80 // Ensure alignment is a compile-time constant.
81 char LLVM_ATTRIBUTE_UNUSED test_arr1
82 [AlignOf<char>::Alignment > 0]
83 [AlignOf<short>::Alignment > 0]
84 [AlignOf<int>::Alignment > 0]
85 [AlignOf<long>::Alignment > 0]
86 [AlignOf<long long>::Alignment > 0]
87 [AlignOf<float>::Alignment > 0]
88 [AlignOf<double>::Alignment > 0]
89 [AlignOf<long double>::Alignment > 0]
90 [AlignOf<void *>::Alignment > 0]
91 [AlignOf<int *>::Alignment > 0]
92 [AlignOf<double (*)(double)>::Alignment > 0]
93 [AlignOf<double (S6::*)()>::Alignment > 0];
94 char LLVM_ATTRIBUTE_UNUSED test_arr2
95 [AlignOf<A1>::Alignment > 0]
96 [AlignOf<A2>::Alignment > 0]
97 [AlignOf<A4>::Alignment > 0]
98 [AlignOf<A8>::Alignment > 0];
99 char LLVM_ATTRIBUTE_UNUSED test_arr3
100 [AlignOf<S1>::Alignment > 0]
101 [AlignOf<S2>::Alignment > 0]
102 [AlignOf<S3>::Alignment > 0]
103 [AlignOf<S4>::Alignment > 0]
104 [AlignOf<S5>::Alignment > 0]
105 [AlignOf<S6>::Alignment > 0];
106 char LLVM_ATTRIBUTE_UNUSED test_arr4
107 [AlignOf<D1>::Alignment > 0]
108 [AlignOf<D2>::Alignment > 0]
109 [AlignOf<D3>::Alignment > 0]
110 [AlignOf<D4>::Alignment > 0]
111 [AlignOf<D5>::Alignment > 0]
112 [AlignOf<D6>::Alignment > 0]
113 [AlignOf<D7>::Alignment > 0]
114 [AlignOf<D8>::Alignment > 0]
115 [AlignOf<D9>::Alignment > 0];
116 char LLVM_ATTRIBUTE_UNUSED test_arr5
117 [AlignOf<V1>::Alignment > 0]
118 [AlignOf<V2>::Alignment > 0]
119 [AlignOf<V3>::Alignment > 0]
120 [AlignOf<V4>::Alignment > 0]
121 [AlignOf<V5>::Alignment > 0]
122 [AlignOf<V6>::Alignment > 0]
123 [AlignOf<V7>::Alignment > 0]
124 [AlignOf<V8>::Alignment > 0];
126 TEST(AlignOfTest, BasicAlignmentInvariants) {
127 EXPECT_LE(1u, alignOf<A1>());
128 EXPECT_LE(2u, alignOf<A2>());
129 EXPECT_LE(4u, alignOf<A4>());
130 EXPECT_LE(8u, alignOf<A8>());
132 EXPECT_EQ(1u, alignOf<char>());
133 EXPECT_LE(alignOf<char>(), alignOf<short>());
134 EXPECT_LE(alignOf<short>(), alignOf<int>());
135 EXPECT_LE(alignOf<int>(), alignOf<long>());
136 EXPECT_LE(alignOf<long>(), alignOf<long long>());
137 EXPECT_LE(alignOf<char>(), alignOf<float>());
138 EXPECT_LE(alignOf<float>(), alignOf<double>());
139 EXPECT_LE(alignOf<char>(), alignOf<long double>());
140 EXPECT_LE(alignOf<char>(), alignOf<void *>());
141 EXPECT_EQ(alignOf<void *>(), alignOf<int *>());
142 EXPECT_LE(alignOf<char>(), alignOf<S1>());
143 EXPECT_LE(alignOf<S1>(), alignOf<S2>());
144 EXPECT_LE(alignOf<S1>(), alignOf<S3>());
145 EXPECT_LE(alignOf<S1>(), alignOf<S4>());
146 EXPECT_LE(alignOf<S1>(), alignOf<S5>());
147 EXPECT_LE(alignOf<S1>(), alignOf<S6>());
148 EXPECT_LE(alignOf<S1>(), alignOf<D1>());
149 EXPECT_LE(alignOf<S1>(), alignOf<D2>());
150 EXPECT_LE(alignOf<S1>(), alignOf<D3>());
151 EXPECT_LE(alignOf<S1>(), alignOf<D4>());
152 EXPECT_LE(alignOf<S1>(), alignOf<D5>());
153 EXPECT_LE(alignOf<S1>(), alignOf<D6>());
154 EXPECT_LE(alignOf<S1>(), alignOf<D7>());
155 EXPECT_LE(alignOf<S1>(), alignOf<D8>());
156 EXPECT_LE(alignOf<S1>(), alignOf<D9>());
157 EXPECT_LE(alignOf<S1>(), alignOf<V1>());
158 EXPECT_LE(alignOf<V1>(), alignOf<V2>());
159 EXPECT_LE(alignOf<V1>(), alignOf<V3>());
160 EXPECT_LE(alignOf<V1>(), alignOf<V4>());
161 EXPECT_LE(alignOf<V1>(), alignOf<V5>());
162 EXPECT_LE(alignOf<V1>(), alignOf<V6>());
163 EXPECT_LE(alignOf<V1>(), alignOf<V7>());
164 EXPECT_LE(alignOf<V1>(), alignOf<V8>());
167 TEST(AlignOfTest, BasicAlignedArray) {
168 EXPECT_LE(1u, alignOf<AlignedCharArrayUnion<A1> >());
169 EXPECT_LE(2u, alignOf<AlignedCharArrayUnion<A2> >());
170 EXPECT_LE(4u, alignOf<AlignedCharArrayUnion<A4> >());
171 EXPECT_LE(8u, alignOf<AlignedCharArrayUnion<A8> >());
173 EXPECT_LE(1u, sizeof(AlignedCharArrayUnion<A1>));
174 EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<A2>));
175 EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<A4>));
176 EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<A8>));
178 EXPECT_EQ(1u, (alignOf<AlignedCharArrayUnion<A1> >()));
179 EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<A1, A2> >()));
180 EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<A1, A2, A4> >()));
181 EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<A1, A2, A4, A8> >()));
183 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1>));
184 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1, A2>));
185 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1, A2, A4>));
186 EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<A1, A2, A4, A8>));
188 EXPECT_EQ(1u, (alignOf<AlignedCharArrayUnion<A1[1]> >()));
189 EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<A1[2], A2[1]> >()));
190 EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<A1[42], A2[55],
192 EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<A1[2], A2[1],
195 EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1[1]>));
196 EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1[2], A2[1]>));
197 EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1[3], A2[2], A4>));
198 EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<A1, A2[3],
201 // For other tests we simply assert that the alignment of the union mathes
202 // that of the fundamental type and hope that we have any weird type
203 // productions that would trigger bugs.
204 EXPECT_EQ(alignOf<char>(), alignOf<AlignedCharArrayUnion<char> >());
205 EXPECT_EQ(alignOf<short>(), alignOf<AlignedCharArrayUnion<short> >());
206 EXPECT_EQ(alignOf<int>(), alignOf<AlignedCharArrayUnion<int> >());
207 EXPECT_EQ(alignOf<long>(), alignOf<AlignedCharArrayUnion<long> >());
208 EXPECT_EQ(alignOf<long long>(),
209 alignOf<AlignedCharArrayUnion<long long> >());
210 EXPECT_EQ(alignOf<float>(), alignOf<AlignedCharArrayUnion<float> >());
211 EXPECT_EQ(alignOf<double>(), alignOf<AlignedCharArrayUnion<double> >());
212 EXPECT_EQ(alignOf<long double>(),
213 alignOf<AlignedCharArrayUnion<long double> >());
214 EXPECT_EQ(alignOf<void *>(), alignOf<AlignedCharArrayUnion<void *> >());
215 EXPECT_EQ(alignOf<int *>(), alignOf<AlignedCharArrayUnion<int *> >());
216 EXPECT_EQ(alignOf<double (*)(double)>(),
217 alignOf<AlignedCharArrayUnion<double (*)(double)> >());
218 EXPECT_EQ(alignOf<double (S6::*)()>(),
219 alignOf<AlignedCharArrayUnion<double (S6::*)()> >());
220 EXPECT_EQ(alignOf<S1>(), alignOf<AlignedCharArrayUnion<S1> >());
221 EXPECT_EQ(alignOf<S2>(), alignOf<AlignedCharArrayUnion<S2> >());
222 EXPECT_EQ(alignOf<S3>(), alignOf<AlignedCharArrayUnion<S3> >());
223 EXPECT_EQ(alignOf<S4>(), alignOf<AlignedCharArrayUnion<S4> >());
224 EXPECT_EQ(alignOf<S5>(), alignOf<AlignedCharArrayUnion<S5> >());
225 EXPECT_EQ(alignOf<S6>(), alignOf<AlignedCharArrayUnion<S6> >());
226 EXPECT_EQ(alignOf<D1>(), alignOf<AlignedCharArrayUnion<D1> >());
227 EXPECT_EQ(alignOf<D2>(), alignOf<AlignedCharArrayUnion<D2> >());
228 EXPECT_EQ(alignOf<D3>(), alignOf<AlignedCharArrayUnion<D3> >());
229 EXPECT_EQ(alignOf<D4>(), alignOf<AlignedCharArrayUnion<D4> >());
230 EXPECT_EQ(alignOf<D5>(), alignOf<AlignedCharArrayUnion<D5> >());
231 EXPECT_EQ(alignOf<D6>(), alignOf<AlignedCharArrayUnion<D6> >());
232 EXPECT_EQ(alignOf<D7>(), alignOf<AlignedCharArrayUnion<D7> >());
233 EXPECT_EQ(alignOf<D8>(), alignOf<AlignedCharArrayUnion<D8> >());
234 EXPECT_EQ(alignOf<D9>(), alignOf<AlignedCharArrayUnion<D9> >());
235 EXPECT_EQ(alignOf<V1>(), alignOf<AlignedCharArrayUnion<V1> >());
236 EXPECT_EQ(alignOf<V2>(), alignOf<AlignedCharArrayUnion<V2> >());
237 EXPECT_EQ(alignOf<V3>(), alignOf<AlignedCharArrayUnion<V3> >());
238 EXPECT_EQ(alignOf<V4>(), alignOf<AlignedCharArrayUnion<V4> >());
239 EXPECT_EQ(alignOf<V5>(), alignOf<AlignedCharArrayUnion<V5> >());
240 EXPECT_EQ(alignOf<V6>(), alignOf<AlignedCharArrayUnion<V6> >());
241 EXPECT_EQ(alignOf<V7>(), alignOf<AlignedCharArrayUnion<V7> >());
243 // Some versions of MSVC get this wrong somewhat disturbingly. The failure
244 // appears to be benign: alignOf<V8>() produces a preposterous value: 12
246 EXPECT_EQ(alignOf<V8>(), alignOf<AlignedCharArrayUnion<V8> >());
249 EXPECT_EQ(sizeof(char), sizeof(AlignedCharArrayUnion<char>));
250 EXPECT_EQ(sizeof(char[1]), sizeof(AlignedCharArrayUnion<char[1]>));
251 EXPECT_EQ(sizeof(char[2]), sizeof(AlignedCharArrayUnion<char[2]>));
252 EXPECT_EQ(sizeof(char[3]), sizeof(AlignedCharArrayUnion<char[3]>));
253 EXPECT_EQ(sizeof(char[4]), sizeof(AlignedCharArrayUnion<char[4]>));
254 EXPECT_EQ(sizeof(char[5]), sizeof(AlignedCharArrayUnion<char[5]>));
255 EXPECT_EQ(sizeof(char[8]), sizeof(AlignedCharArrayUnion<char[8]>));
256 EXPECT_EQ(sizeof(char[13]), sizeof(AlignedCharArrayUnion<char[13]>));
257 EXPECT_EQ(sizeof(char[16]), sizeof(AlignedCharArrayUnion<char[16]>));
258 EXPECT_EQ(sizeof(char[21]), sizeof(AlignedCharArrayUnion<char[21]>));
259 EXPECT_EQ(sizeof(char[32]), sizeof(AlignedCharArrayUnion<char[32]>));
260 EXPECT_EQ(sizeof(short), sizeof(AlignedCharArrayUnion<short>));
261 EXPECT_EQ(sizeof(int), sizeof(AlignedCharArrayUnion<int>));
262 EXPECT_EQ(sizeof(long), sizeof(AlignedCharArrayUnion<long>));
263 EXPECT_EQ(sizeof(long long),
264 sizeof(AlignedCharArrayUnion<long long>));
265 EXPECT_EQ(sizeof(float), sizeof(AlignedCharArrayUnion<float>));
266 EXPECT_EQ(sizeof(double), sizeof(AlignedCharArrayUnion<double>));
267 EXPECT_EQ(sizeof(long double),
268 sizeof(AlignedCharArrayUnion<long double>));
269 EXPECT_EQ(sizeof(void *), sizeof(AlignedCharArrayUnion<void *>));
270 EXPECT_EQ(sizeof(int *), sizeof(AlignedCharArrayUnion<int *>));
271 EXPECT_EQ(sizeof(double (*)(double)),
272 sizeof(AlignedCharArrayUnion<double (*)(double)>));
273 EXPECT_EQ(sizeof(double (S6::*)()),
274 sizeof(AlignedCharArrayUnion<double (S6::*)()>));
275 EXPECT_EQ(sizeof(S1), sizeof(AlignedCharArrayUnion<S1>));
276 EXPECT_EQ(sizeof(S2), sizeof(AlignedCharArrayUnion<S2>));
277 EXPECT_EQ(sizeof(S3), sizeof(AlignedCharArrayUnion<S3>));
278 EXPECT_EQ(sizeof(S4), sizeof(AlignedCharArrayUnion<S4>));
279 EXPECT_EQ(sizeof(S5), sizeof(AlignedCharArrayUnion<S5>));
280 EXPECT_EQ(sizeof(S6), sizeof(AlignedCharArrayUnion<S6>));
281 EXPECT_EQ(sizeof(D1), sizeof(AlignedCharArrayUnion<D1>));
282 EXPECT_EQ(sizeof(D2), sizeof(AlignedCharArrayUnion<D2>));
283 EXPECT_EQ(sizeof(D3), sizeof(AlignedCharArrayUnion<D3>));
284 EXPECT_EQ(sizeof(D4), sizeof(AlignedCharArrayUnion<D4>));
285 EXPECT_EQ(sizeof(D5), sizeof(AlignedCharArrayUnion<D5>));
286 EXPECT_EQ(sizeof(D6), sizeof(AlignedCharArrayUnion<D6>));
287 EXPECT_EQ(sizeof(D7), sizeof(AlignedCharArrayUnion<D7>));
288 EXPECT_EQ(sizeof(D8), sizeof(AlignedCharArrayUnion<D8>));
289 EXPECT_EQ(sizeof(D9), sizeof(AlignedCharArrayUnion<D9>));
290 EXPECT_EQ(sizeof(D9[1]), sizeof(AlignedCharArrayUnion<D9[1]>));
291 EXPECT_EQ(sizeof(D9[2]), sizeof(AlignedCharArrayUnion<D9[2]>));
292 EXPECT_EQ(sizeof(D9[3]), sizeof(AlignedCharArrayUnion<D9[3]>));
293 EXPECT_EQ(sizeof(D9[4]), sizeof(AlignedCharArrayUnion<D9[4]>));
294 EXPECT_EQ(sizeof(D9[5]), sizeof(AlignedCharArrayUnion<D9[5]>));
295 EXPECT_EQ(sizeof(D9[8]), sizeof(AlignedCharArrayUnion<D9[8]>));
296 EXPECT_EQ(sizeof(D9[13]), sizeof(AlignedCharArrayUnion<D9[13]>));
297 EXPECT_EQ(sizeof(D9[16]), sizeof(AlignedCharArrayUnion<D9[16]>));
298 EXPECT_EQ(sizeof(D9[21]), sizeof(AlignedCharArrayUnion<D9[21]>));
299 EXPECT_EQ(sizeof(D9[32]), sizeof(AlignedCharArrayUnion<D9[32]>));
300 EXPECT_EQ(sizeof(V1), sizeof(AlignedCharArrayUnion<V1>));
301 EXPECT_EQ(sizeof(V2), sizeof(AlignedCharArrayUnion<V2>));
302 EXPECT_EQ(sizeof(V3), sizeof(AlignedCharArrayUnion<V3>));
303 EXPECT_EQ(sizeof(V4), sizeof(AlignedCharArrayUnion<V4>));
304 EXPECT_EQ(sizeof(V5), sizeof(AlignedCharArrayUnion<V5>));
305 EXPECT_EQ(sizeof(V6), sizeof(AlignedCharArrayUnion<V6>));
306 EXPECT_EQ(sizeof(V7), sizeof(AlignedCharArrayUnion<V7>));
308 // Some versions of MSVC also get this wrong. The failure again appears to be
309 // benign: sizeof(V8) is only 52 bytes, but our array reserves 56.
311 EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>));