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