1 | //=== - llvm/unittest/Support/AlignOfTest.cpp - Alignment utility tests ---===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | #ifdef _MSC_VER |
10 | // Disable warnings about alignment-based structure padding. |
11 | // This must be above the includes to suppress warnings in included templates. |
12 | #pragma warning(disable:4324) |
13 | #endif |
14 | |
15 | #include "llvm/Support/AlignOf.h" |
16 | #include "llvm/Support/Compiler.h" |
17 | #include "gtest/gtest.h" |
18 | |
19 | using namespace llvm; |
20 | |
21 | namespace { |
22 | // Disable warnings about questionable type definitions. |
23 | // We're testing that even questionable types work with the alignment utilities. |
24 | #ifdef _MSC_VER |
25 | #pragma warning(disable:4584) |
26 | #endif |
27 | |
28 | // Suppress direct base '{anonymous}::S1' inaccessible in '{anonymous}::D9' |
29 | // due to ambiguity warning. |
30 | #ifdef __clang__ |
31 | #pragma clang diagnostic ignored "-Wunknown-pragmas" |
32 | #pragma clang diagnostic ignored "-Winaccessible-base" |
33 | #elif ((__GNUC__ * 100) + __GNUC_MINOR__) >= 402 |
34 | // Pragma based warning suppression was introduced in GGC 4.2. Additionally |
35 | // this warning is "enabled by default". The warning still appears if -Wall is |
36 | // suppressed. Apparently GCC suppresses it when -w is specifed, which is odd. |
37 | #pragma GCC diagnostic warning "-w" |
38 | #endif |
39 | |
40 | // Define some fixed alignment types to use in these tests. |
41 | struct alignas(1) A1 {}; |
42 | struct alignas(2) A2 {}; |
43 | struct alignas(4) A4 {}; |
44 | struct alignas(8) A8 {}; |
45 | |
46 | struct S1 {}; |
47 | struct S2 { char a; }; |
48 | struct S3 { int x; }; |
49 | struct S4 { double y; }; |
50 | struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; }; |
51 | struct S6 { double f(); }; |
52 | struct D1 : S1 {}; |
53 | struct D2 : S6 { float g(); }; |
54 | struct D3 : S2 {}; |
55 | struct D4 : S2 { int x; }; |
56 | struct D5 : S3 { char c; }; |
57 | struct D6 : S2, S3 {}; |
58 | struct D7 : S1, S3 {}; |
59 | struct D8 : S1, D4, D5 { double x[2]; }; |
60 | struct D9 : S1, D1 { S1 s1; }; |
61 | struct V1 { virtual ~V1(); }; |
62 | struct V2 { int x; virtual ~V2(); }; |
63 | struct V3 : V1 { |
64 | ~V3() override; |
65 | }; |
66 | struct V4 : virtual V2 { int y; |
67 | ~V4() override; |
68 | }; |
69 | struct V5 : V4, V3 { double z; |
70 | ~V5() override; |
71 | }; |
72 | struct V6 : S1 { virtual ~V6(); }; |
73 | struct V7 : virtual V2, virtual V6 { |
74 | ~V7() override; |
75 | }; |
76 | struct V8 : V5, virtual V6, V7 { double zz; |
77 | ~V8() override; |
78 | }; |
79 | |
80 | double S6::f() { return 0.0; } |
81 | float D2::g() { return 0.0f; } |
82 | V1::~V1() {} |
83 | V2::~V2() {} |
84 | V3::~V3() {} |
85 | V4::~V4() {} |
86 | V5::~V5() {} |
87 | V6::~V6() {} |
88 | V7::~V7() {} |
89 | V8::~V8() {} |
90 | |
91 | template <typename M> struct T { M m; }; |
92 | |
93 | TEST(AlignOfTest, BasicAlignedArray) { |
94 | EXPECT_LE(1u, alignof(AlignedCharArrayUnion<A1>)); |
95 | EXPECT_LE(2u, alignof(AlignedCharArrayUnion<A2>)); |
96 | EXPECT_LE(4u, alignof(AlignedCharArrayUnion<A4>)); |
97 | EXPECT_LE(8u, alignof(AlignedCharArrayUnion<A8>)); |
98 | |
99 | EXPECT_LE(1u, sizeof(AlignedCharArrayUnion<A1>)); |
100 | EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<A2>)); |
101 | EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<A4>)); |
102 | EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<A8>)); |
103 | |
104 | EXPECT_EQ(1u, (alignof(AlignedCharArrayUnion<A1>))); |
105 | EXPECT_EQ(2u, (alignof(AlignedCharArrayUnion<A1, A2>))); |
106 | EXPECT_EQ(4u, (alignof(AlignedCharArrayUnion<A1, A2, A4>))); |
107 | EXPECT_EQ(8u, (alignof(AlignedCharArrayUnion<A1, A2, A4, A8>))); |
108 | |
109 | EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1>)); |
110 | EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1, A2>)); |
111 | EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1, A2, A4>)); |
112 | EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<A1, A2, A4, A8>)); |
113 | |
114 | EXPECT_EQ(1u, (alignof(AlignedCharArrayUnion<A1[1]>))); |
115 | EXPECT_EQ(2u, (alignof(AlignedCharArrayUnion<A1[2], A2[1]>))); |
116 | EXPECT_EQ(4u, (alignof(AlignedCharArrayUnion<A1[42], A2[55], A4[13]>))); |
117 | EXPECT_EQ(8u, (alignof(AlignedCharArrayUnion<A1[2], A2[1], A4, A8>))); |
118 | |
119 | EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1[1]>)); |
120 | EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1[2], A2[1]>)); |
121 | EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1[3], A2[2], A4>)); |
122 | EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<A1, A2[3], |
123 | A4[3], A8>)); |
124 | |
125 | // For other tests we simply assert that the alignment of the union mathes |
126 | // that of the fundamental type and hope that we have any weird type |
127 | // productions that would trigger bugs. |
128 | EXPECT_EQ(alignof(T<char>), alignof(AlignedCharArrayUnion<char>)); |
129 | EXPECT_EQ(alignof(T<short>), alignof(AlignedCharArrayUnion<short>)); |
130 | EXPECT_EQ(alignof(T<int>), alignof(AlignedCharArrayUnion<int>)); |
131 | EXPECT_EQ(alignof(T<long>), alignof(AlignedCharArrayUnion<long>)); |
132 | EXPECT_EQ(alignof(T<long long>), alignof(AlignedCharArrayUnion<long long>)); |
133 | EXPECT_EQ(alignof(T<float>), alignof(AlignedCharArrayUnion<float>)); |
134 | #ifdef _AIX |
135 | EXPECT_LE(alignof(T<double>), alignof(AlignedCharArrayUnion<double>)); |
136 | EXPECT_LE(alignof(T<long double>), |
137 | alignof(AlignedCharArrayUnion<long double>)); |
138 | EXPECT_LE(alignof(S4), alignof(AlignedCharArrayUnion<S4>)); |
139 | #else |
140 | EXPECT_EQ(alignof(T<double>), alignof(AlignedCharArrayUnion<double>)); |
141 | EXPECT_EQ(alignof(T<long double>), |
142 | alignof(AlignedCharArrayUnion<long double>)); |
143 | EXPECT_EQ(alignof(S4), alignof(AlignedCharArrayUnion<S4>)); |
144 | #endif |
145 | EXPECT_EQ(alignof(T<void *>), alignof(AlignedCharArrayUnion<void *>)); |
146 | EXPECT_EQ(alignof(T<int *>), alignof(AlignedCharArrayUnion<int *>)); |
147 | EXPECT_EQ(alignof(T<double (*)(double)>), |
148 | alignof(AlignedCharArrayUnion<double (*)(double)>)); |
149 | EXPECT_EQ(alignof(T<double (S6::*)()>), |
150 | alignof(AlignedCharArrayUnion<double (S6::*)()>)); |
151 | EXPECT_EQ(alignof(S1), alignof(AlignedCharArrayUnion<S1>)); |
152 | EXPECT_EQ(alignof(S2), alignof(AlignedCharArrayUnion<S2>)); |
153 | EXPECT_EQ(alignof(S3), alignof(AlignedCharArrayUnion<S3>)); |
154 | EXPECT_EQ(alignof(S5), alignof(AlignedCharArrayUnion<S5>)); |
155 | EXPECT_EQ(alignof(S6), alignof(AlignedCharArrayUnion<S6>)); |
156 | EXPECT_EQ(alignof(D1), alignof(AlignedCharArrayUnion<D1>)); |
157 | EXPECT_EQ(alignof(D2), alignof(AlignedCharArrayUnion<D2>)); |
158 | EXPECT_EQ(alignof(D3), alignof(AlignedCharArrayUnion<D3>)); |
159 | EXPECT_EQ(alignof(D4), alignof(AlignedCharArrayUnion<D4>)); |
160 | EXPECT_EQ(alignof(D5), alignof(AlignedCharArrayUnion<D5>)); |
161 | EXPECT_EQ(alignof(D6), alignof(AlignedCharArrayUnion<D6>)); |
162 | EXPECT_EQ(alignof(D7), alignof(AlignedCharArrayUnion<D7>)); |
163 | EXPECT_EQ(alignof(D8), alignof(AlignedCharArrayUnion<D8>)); |
164 | EXPECT_EQ(alignof(D9), alignof(AlignedCharArrayUnion<D9>)); |
165 | EXPECT_EQ(alignof(V1), alignof(AlignedCharArrayUnion<V1>)); |
166 | EXPECT_EQ(alignof(V2), alignof(AlignedCharArrayUnion<V2>)); |
167 | EXPECT_EQ(alignof(V3), alignof(AlignedCharArrayUnion<V3>)); |
168 | EXPECT_EQ(alignof(V4), alignof(AlignedCharArrayUnion<V4>)); |
169 | EXPECT_EQ(alignof(V5), alignof(AlignedCharArrayUnion<V5>)); |
170 | EXPECT_EQ(alignof(V6), alignof(AlignedCharArrayUnion<V6>)); |
171 | EXPECT_EQ(alignof(V7), alignof(AlignedCharArrayUnion<V7>)); |
172 | |
173 | // Some versions of MSVC get this wrong somewhat disturbingly. The failure |
174 | // appears to be benign: alignof(V8) produces a preposterous value: 12 |
175 | #ifndef _MSC_VER |
176 | EXPECT_EQ(alignof(V8), alignof(AlignedCharArrayUnion<V8>)); |
177 | #endif |
178 | |
179 | EXPECT_EQ(sizeof(char), sizeof(AlignedCharArrayUnion<char>)); |
180 | EXPECT_EQ(sizeof(char[1]), sizeof(AlignedCharArrayUnion<char[1]>)); |
181 | EXPECT_EQ(sizeof(char[2]), sizeof(AlignedCharArrayUnion<char[2]>)); |
182 | EXPECT_EQ(sizeof(char[3]), sizeof(AlignedCharArrayUnion<char[3]>)); |
183 | EXPECT_EQ(sizeof(char[4]), sizeof(AlignedCharArrayUnion<char[4]>)); |
184 | EXPECT_EQ(sizeof(char[5]), sizeof(AlignedCharArrayUnion<char[5]>)); |
185 | EXPECT_EQ(sizeof(char[8]), sizeof(AlignedCharArrayUnion<char[8]>)); |
186 | EXPECT_EQ(sizeof(char[13]), sizeof(AlignedCharArrayUnion<char[13]>)); |
187 | EXPECT_EQ(sizeof(char[16]), sizeof(AlignedCharArrayUnion<char[16]>)); |
188 | EXPECT_EQ(sizeof(char[21]), sizeof(AlignedCharArrayUnion<char[21]>)); |
189 | EXPECT_EQ(sizeof(char[32]), sizeof(AlignedCharArrayUnion<char[32]>)); |
190 | EXPECT_EQ(sizeof(short), sizeof(AlignedCharArrayUnion<short>)); |
191 | EXPECT_EQ(sizeof(int), sizeof(AlignedCharArrayUnion<int>)); |
192 | EXPECT_EQ(sizeof(long), sizeof(AlignedCharArrayUnion<long>)); |
193 | EXPECT_EQ(sizeof(long long), |
194 | sizeof(AlignedCharArrayUnion<long long>)); |
195 | EXPECT_EQ(sizeof(float), sizeof(AlignedCharArrayUnion<float>)); |
196 | EXPECT_EQ(sizeof(double), sizeof(AlignedCharArrayUnion<double>)); |
197 | EXPECT_EQ(sizeof(long double), |
198 | sizeof(AlignedCharArrayUnion<long double>)); |
199 | EXPECT_EQ(sizeof(void *), sizeof(AlignedCharArrayUnion<void *>)); |
200 | EXPECT_EQ(sizeof(int *), sizeof(AlignedCharArrayUnion<int *>)); |
201 | EXPECT_EQ(sizeof(double (*)(double)), |
202 | sizeof(AlignedCharArrayUnion<double (*)(double)>)); |
203 | EXPECT_EQ(sizeof(double (S6::*)()), |
204 | sizeof(AlignedCharArrayUnion<double (S6::*)()>)); |
205 | EXPECT_EQ(sizeof(S1), sizeof(AlignedCharArrayUnion<S1>)); |
206 | EXPECT_EQ(sizeof(S2), sizeof(AlignedCharArrayUnion<S2>)); |
207 | EXPECT_EQ(sizeof(S3), sizeof(AlignedCharArrayUnion<S3>)); |
208 | EXPECT_EQ(sizeof(S4), sizeof(AlignedCharArrayUnion<S4>)); |
209 | EXPECT_EQ(sizeof(S5), sizeof(AlignedCharArrayUnion<S5>)); |
210 | EXPECT_EQ(sizeof(S6), sizeof(AlignedCharArrayUnion<S6>)); |
211 | EXPECT_EQ(sizeof(D1), sizeof(AlignedCharArrayUnion<D1>)); |
212 | EXPECT_EQ(sizeof(D2), sizeof(AlignedCharArrayUnion<D2>)); |
213 | EXPECT_EQ(sizeof(D3), sizeof(AlignedCharArrayUnion<D3>)); |
214 | EXPECT_EQ(sizeof(D4), sizeof(AlignedCharArrayUnion<D4>)); |
215 | EXPECT_EQ(sizeof(D5), sizeof(AlignedCharArrayUnion<D5>)); |
216 | EXPECT_EQ(sizeof(D6), sizeof(AlignedCharArrayUnion<D6>)); |
217 | EXPECT_EQ(sizeof(D7), sizeof(AlignedCharArrayUnion<D7>)); |
218 | EXPECT_EQ(sizeof(D8), sizeof(AlignedCharArrayUnion<D8>)); |
219 | EXPECT_EQ(sizeof(D9), sizeof(AlignedCharArrayUnion<D9>)); |
220 | EXPECT_EQ(sizeof(D9[1]), sizeof(AlignedCharArrayUnion<D9[1]>)); |
221 | EXPECT_EQ(sizeof(D9[2]), sizeof(AlignedCharArrayUnion<D9[2]>)); |
222 | EXPECT_EQ(sizeof(D9[3]), sizeof(AlignedCharArrayUnion<D9[3]>)); |
223 | EXPECT_EQ(sizeof(D9[4]), sizeof(AlignedCharArrayUnion<D9[4]>)); |
224 | EXPECT_EQ(sizeof(D9[5]), sizeof(AlignedCharArrayUnion<D9[5]>)); |
225 | EXPECT_EQ(sizeof(D9[8]), sizeof(AlignedCharArrayUnion<D9[8]>)); |
226 | EXPECT_EQ(sizeof(D9[13]), sizeof(AlignedCharArrayUnion<D9[13]>)); |
227 | EXPECT_EQ(sizeof(D9[16]), sizeof(AlignedCharArrayUnion<D9[16]>)); |
228 | EXPECT_EQ(sizeof(D9[21]), sizeof(AlignedCharArrayUnion<D9[21]>)); |
229 | EXPECT_EQ(sizeof(D9[32]), sizeof(AlignedCharArrayUnion<D9[32]>)); |
230 | EXPECT_EQ(sizeof(V1), sizeof(AlignedCharArrayUnion<V1>)); |
231 | EXPECT_EQ(sizeof(V2), sizeof(AlignedCharArrayUnion<V2>)); |
232 | EXPECT_EQ(sizeof(V3), sizeof(AlignedCharArrayUnion<V3>)); |
233 | EXPECT_EQ(sizeof(V4), sizeof(AlignedCharArrayUnion<V4>)); |
234 | EXPECT_EQ(sizeof(V5), sizeof(AlignedCharArrayUnion<V5>)); |
235 | EXPECT_EQ(sizeof(V6), sizeof(AlignedCharArrayUnion<V6>)); |
236 | EXPECT_EQ(sizeof(V7), sizeof(AlignedCharArrayUnion<V7>)); |
237 | |
238 | // Some versions of MSVC also get this wrong. The failure again appears to be |
239 | // benign: sizeof(V8) is only 52 bytes, but our array reserves 56. |
240 | #ifndef _MSC_VER |
241 | EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>)); |
242 | #endif |
243 | } |
244 | } // end anonymous namespace |
245 | |