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