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
19using namespace llvm;
20
21namespace {
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.
41struct alignas(1) A1 {};
42struct alignas(2) A2 {};
43struct alignas(4) A4 {};
44struct alignas(8) A8 {};
45
46struct S1 {};
47struct S2 { char a; };
48struct S3 { int x; };
49struct S4 { double y; };
50struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; };
51struct S6 { double f(); };
52struct D1 : S1 {};
53struct D2 : S6 { float g(); };
54struct D3 : S2 {};
55struct D4 : S2 { int x; };
56struct D5 : S3 { char c; };
57struct D6 : S2, S3 {};
58struct D7 : S1, S3 {};
59struct D8 : S1, D4, D5 { double x[2]; };
60struct D9 : S1, D1 { S1 s1; };
61struct V1 { virtual ~V1(); };
62struct V2 { int x; virtual ~V2(); };
63struct V3 : V1 {
64 ~V3() override;
65};
66struct V4 : virtual V2 { int y;
67 ~V4() override;
68};
69struct V5 : V4, V3 { double z;
70 ~V5() override;
71};
72struct V6 : S1 { virtual ~V6(); };
73struct V7 : virtual V2, virtual V6 {
74 ~V7() override;
75};
76struct V8 : V5, virtual V6, V7 { double zz;
77 ~V8() override;
78};
79
80double S6::f() { return 0.0; }
81float D2::g() { return 0.0f; }
82V1::~V1() {}
83V2::~V2() {}
84V3::~V3() {}
85V4::~V4() {}
86V5::~V5() {}
87V6::~V6() {}
88V7::~V7() {}
89V8::~V8() {}
90
91template <typename M> struct T { M m; };
92
93TEST(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

source code of llvm/unittests/Support/AlignOfTest.cpp