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 #ifdef _MSC_VER
11 // Disable warnings about alignment-based structure padding.
12 // This must be above the includes to suppress warnings in included templates.
13 #pragma warning(disable:4324)
14 #endif
15 
16 #include "llvm/Support/AlignOf.h"
17 #include "llvm/Support/Compiler.h"
18 #include "gtest/gtest.h"
19 
20 using namespace llvm;
21 
22 namespace {
23 // Disable warnings about questionable type definitions.
24 // We're testing that even questionable types work with the alignment utilities.
25 #ifdef _MSC_VER
26 #pragma warning(disable:4584)
27 #endif
28 
29 // Suppress direct base '{anonymous}::S1' inaccessible in '{anonymous}::D9'
30 // due to ambiguity warning.
31 #ifdef __clang__
32 #pragma clang diagnostic ignored "-Wunknown-pragmas"
33 #pragma clang diagnostic ignored "-Winaccessible-base"
34 #elif ((__GNUC__ * 100) + __GNUC_MINOR__) >= 402
35 // Pragma based warning suppression was introduced in GGC 4.2.  Additionally
36 // this warning is "enabled by default".  The warning still appears if -Wall is
37 // suppressed.  Apparently GCC suppresses it when -w is specifed, which is odd.
38 #pragma GCC diagnostic warning "-w"
39 #endif
40 
41 // Define some fixed alignment types to use in these tests.
42 struct LLVM_ALIGNAS(1) A1 {};
43 struct LLVM_ALIGNAS(2) A2 {};
44 struct LLVM_ALIGNAS(4) A4 {};
45 struct LLVM_ALIGNAS(8) A8 {};
46 
47 struct S1 {};
48 struct S2 { char a; };
49 struct S3 { int x; };
50 struct S4 { double y; };
51 struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; };
52 struct S6 { double f(); };
53 struct D1 : S1 {};
54 struct D2 : S6 { float g(); };
55 struct D3 : S2 {};
56 struct D4 : S2 { int x; };
57 struct D5 : S3 { char c; };
58 struct D6 : S2, S3 {};
59 struct D7 : S1, S3 {};
60 struct D8 : S1, D4, D5 { double x[2]; };
61 struct D9 : S1, D1 { S1 s1; };
62 struct V1 { virtual ~V1(); };
63 struct V2 { int x; virtual ~V2(); };
64 struct V3 : V1 {
65   ~V3() override;
66 };
67 struct V4 : virtual V2 { int y;
68   ~V4() override;
69 };
70 struct V5 : V4, V3 { double z;
71   ~V5() override;
72 };
73 struct V6 : S1 { virtual ~V6(); };
74 struct V7 : virtual V2, virtual V6 {
75   ~V7() override;
76 };
77 struct V8 : V5, virtual V6, V7 { double zz;
78   ~V8() override;
79 };
80 
f()81 double S6::f() { return 0.0; }
g()82 float D2::g() { return 0.0f; }
~V1()83 V1::~V1() {}
~V2()84 V2::~V2() {}
~V3()85 V3::~V3() {}
~V4()86 V4::~V4() {}
~V5()87 V5::~V5() {}
~V6()88 V6::~V6() {}
~V7()89 V7::~V7() {}
~V8()90 V8::~V8() {}
91 
92 template <typename M> struct T { M m; };
93 
TEST(AlignOfTest,BasicAlignedArray)94 TEST(AlignOfTest, BasicAlignedArray) {
95   EXPECT_LE(1u, alignof(AlignedCharArrayUnion<A1>));
96   EXPECT_LE(2u, alignof(AlignedCharArrayUnion<A2>));
97   EXPECT_LE(4u, alignof(AlignedCharArrayUnion<A4>));
98   EXPECT_LE(8u, alignof(AlignedCharArrayUnion<A8>));
99 
100   EXPECT_LE(1u, sizeof(AlignedCharArrayUnion<A1>));
101   EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<A2>));
102   EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<A4>));
103   EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<A8>));
104 
105   EXPECT_EQ(1u, (alignof(AlignedCharArrayUnion<A1>)));
106   EXPECT_EQ(2u, (alignof(AlignedCharArrayUnion<A1, A2>)));
107   EXPECT_EQ(4u, (alignof(AlignedCharArrayUnion<A1, A2, A4>)));
108   EXPECT_EQ(8u, (alignof(AlignedCharArrayUnion<A1, A2, A4, A8>)));
109 
110   EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1>));
111   EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1, A2>));
112   EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1, A2, A4>));
113   EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<A1, A2, A4, A8>));
114 
115   EXPECT_EQ(1u, (alignof(AlignedCharArrayUnion<A1[1]>)));
116   EXPECT_EQ(2u, (alignof(AlignedCharArrayUnion<A1[2], A2[1]>)));
117   EXPECT_EQ(4u, (alignof(AlignedCharArrayUnion<A1[42], A2[55], A4[13]>)));
118   EXPECT_EQ(8u, (alignof(AlignedCharArrayUnion<A1[2], A2[1], A4, A8>)));
119 
120   EXPECT_EQ(1u,  sizeof(AlignedCharArrayUnion<A1[1]>));
121   EXPECT_EQ(2u,  sizeof(AlignedCharArrayUnion<A1[2], A2[1]>));
122   EXPECT_EQ(4u,  sizeof(AlignedCharArrayUnion<A1[3], A2[2], A4>));
123   EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<A1, A2[3],
124                                               A4[3], A8>));
125 
126   // For other tests we simply assert that the alignment of the union mathes
127   // that of the fundamental type and hope that we have any weird type
128   // productions that would trigger bugs.
129   EXPECT_EQ(alignof(T<char>), alignof(AlignedCharArrayUnion<char>));
130   EXPECT_EQ(alignof(T<short>), alignof(AlignedCharArrayUnion<short>));
131   EXPECT_EQ(alignof(T<int>), alignof(AlignedCharArrayUnion<int>));
132   EXPECT_EQ(alignof(T<long>), alignof(AlignedCharArrayUnion<long>));
133   EXPECT_EQ(alignof(T<long long>), alignof(AlignedCharArrayUnion<long long>));
134   EXPECT_EQ(alignof(T<float>), alignof(AlignedCharArrayUnion<float>));
135   EXPECT_EQ(alignof(T<double>), alignof(AlignedCharArrayUnion<double>));
136   EXPECT_EQ(alignof(T<long double>),
137             alignof(AlignedCharArrayUnion<long double>));
138   EXPECT_EQ(alignof(T<void *>), alignof(AlignedCharArrayUnion<void *>));
139   EXPECT_EQ(alignof(T<int *>), alignof(AlignedCharArrayUnion<int *>));
140   EXPECT_EQ(alignof(T<double (*)(double)>),
141             alignof(AlignedCharArrayUnion<double (*)(double)>));
142   EXPECT_EQ(alignof(T<double (S6::*)()>),
143             alignof(AlignedCharArrayUnion<double (S6::*)()>));
144   EXPECT_EQ(alignof(S1), alignof(AlignedCharArrayUnion<S1>));
145   EXPECT_EQ(alignof(S2), alignof(AlignedCharArrayUnion<S2>));
146   EXPECT_EQ(alignof(S3), alignof(AlignedCharArrayUnion<S3>));
147   EXPECT_EQ(alignof(S4), alignof(AlignedCharArrayUnion<S4>));
148   EXPECT_EQ(alignof(S5), alignof(AlignedCharArrayUnion<S5>));
149   EXPECT_EQ(alignof(S6), alignof(AlignedCharArrayUnion<S6>));
150   EXPECT_EQ(alignof(D1), alignof(AlignedCharArrayUnion<D1>));
151   EXPECT_EQ(alignof(D2), alignof(AlignedCharArrayUnion<D2>));
152   EXPECT_EQ(alignof(D3), alignof(AlignedCharArrayUnion<D3>));
153   EXPECT_EQ(alignof(D4), alignof(AlignedCharArrayUnion<D4>));
154   EXPECT_EQ(alignof(D5), alignof(AlignedCharArrayUnion<D5>));
155   EXPECT_EQ(alignof(D6), alignof(AlignedCharArrayUnion<D6>));
156   EXPECT_EQ(alignof(D7), alignof(AlignedCharArrayUnion<D7>));
157   EXPECT_EQ(alignof(D8), alignof(AlignedCharArrayUnion<D8>));
158   EXPECT_EQ(alignof(D9), alignof(AlignedCharArrayUnion<D9>));
159   EXPECT_EQ(alignof(V1), alignof(AlignedCharArrayUnion<V1>));
160   EXPECT_EQ(alignof(V2), alignof(AlignedCharArrayUnion<V2>));
161   EXPECT_EQ(alignof(V3), alignof(AlignedCharArrayUnion<V3>));
162   EXPECT_EQ(alignof(V4), alignof(AlignedCharArrayUnion<V4>));
163   EXPECT_EQ(alignof(V5), alignof(AlignedCharArrayUnion<V5>));
164   EXPECT_EQ(alignof(V6), alignof(AlignedCharArrayUnion<V6>));
165   EXPECT_EQ(alignof(V7), alignof(AlignedCharArrayUnion<V7>));
166 
167   // Some versions of MSVC get this wrong somewhat disturbingly. The failure
168   // appears to be benign: alignof(V8) produces a preposterous value: 12
169 #ifndef _MSC_VER
170   EXPECT_EQ(alignof(V8), alignof(AlignedCharArrayUnion<V8>));
171 #endif
172 
173   EXPECT_EQ(sizeof(char), sizeof(AlignedCharArrayUnion<char>));
174   EXPECT_EQ(sizeof(char[1]), sizeof(AlignedCharArrayUnion<char[1]>));
175   EXPECT_EQ(sizeof(char[2]), sizeof(AlignedCharArrayUnion<char[2]>));
176   EXPECT_EQ(sizeof(char[3]), sizeof(AlignedCharArrayUnion<char[3]>));
177   EXPECT_EQ(sizeof(char[4]), sizeof(AlignedCharArrayUnion<char[4]>));
178   EXPECT_EQ(sizeof(char[5]), sizeof(AlignedCharArrayUnion<char[5]>));
179   EXPECT_EQ(sizeof(char[8]), sizeof(AlignedCharArrayUnion<char[8]>));
180   EXPECT_EQ(sizeof(char[13]), sizeof(AlignedCharArrayUnion<char[13]>));
181   EXPECT_EQ(sizeof(char[16]), sizeof(AlignedCharArrayUnion<char[16]>));
182   EXPECT_EQ(sizeof(char[21]), sizeof(AlignedCharArrayUnion<char[21]>));
183   EXPECT_EQ(sizeof(char[32]), sizeof(AlignedCharArrayUnion<char[32]>));
184   EXPECT_EQ(sizeof(short), sizeof(AlignedCharArrayUnion<short>));
185   EXPECT_EQ(sizeof(int), sizeof(AlignedCharArrayUnion<int>));
186   EXPECT_EQ(sizeof(long), sizeof(AlignedCharArrayUnion<long>));
187   EXPECT_EQ(sizeof(long long),
188             sizeof(AlignedCharArrayUnion<long long>));
189   EXPECT_EQ(sizeof(float), sizeof(AlignedCharArrayUnion<float>));
190   EXPECT_EQ(sizeof(double), sizeof(AlignedCharArrayUnion<double>));
191   EXPECT_EQ(sizeof(long double),
192             sizeof(AlignedCharArrayUnion<long double>));
193   EXPECT_EQ(sizeof(void *), sizeof(AlignedCharArrayUnion<void *>));
194   EXPECT_EQ(sizeof(int *), sizeof(AlignedCharArrayUnion<int *>));
195   EXPECT_EQ(sizeof(double (*)(double)),
196             sizeof(AlignedCharArrayUnion<double (*)(double)>));
197   EXPECT_EQ(sizeof(double (S6::*)()),
198             sizeof(AlignedCharArrayUnion<double (S6::*)()>));
199   EXPECT_EQ(sizeof(S1), sizeof(AlignedCharArrayUnion<S1>));
200   EXPECT_EQ(sizeof(S2), sizeof(AlignedCharArrayUnion<S2>));
201   EXPECT_EQ(sizeof(S3), sizeof(AlignedCharArrayUnion<S3>));
202   EXPECT_EQ(sizeof(S4), sizeof(AlignedCharArrayUnion<S4>));
203   EXPECT_EQ(sizeof(S5), sizeof(AlignedCharArrayUnion<S5>));
204   EXPECT_EQ(sizeof(S6), sizeof(AlignedCharArrayUnion<S6>));
205   EXPECT_EQ(sizeof(D1), sizeof(AlignedCharArrayUnion<D1>));
206   EXPECT_EQ(sizeof(D2), sizeof(AlignedCharArrayUnion<D2>));
207   EXPECT_EQ(sizeof(D3), sizeof(AlignedCharArrayUnion<D3>));
208   EXPECT_EQ(sizeof(D4), sizeof(AlignedCharArrayUnion<D4>));
209   EXPECT_EQ(sizeof(D5), sizeof(AlignedCharArrayUnion<D5>));
210   EXPECT_EQ(sizeof(D6), sizeof(AlignedCharArrayUnion<D6>));
211   EXPECT_EQ(sizeof(D7), sizeof(AlignedCharArrayUnion<D7>));
212   EXPECT_EQ(sizeof(D8), sizeof(AlignedCharArrayUnion<D8>));
213   EXPECT_EQ(sizeof(D9), sizeof(AlignedCharArrayUnion<D9>));
214   EXPECT_EQ(sizeof(D9[1]), sizeof(AlignedCharArrayUnion<D9[1]>));
215   EXPECT_EQ(sizeof(D9[2]), sizeof(AlignedCharArrayUnion<D9[2]>));
216   EXPECT_EQ(sizeof(D9[3]), sizeof(AlignedCharArrayUnion<D9[3]>));
217   EXPECT_EQ(sizeof(D9[4]), sizeof(AlignedCharArrayUnion<D9[4]>));
218   EXPECT_EQ(sizeof(D9[5]), sizeof(AlignedCharArrayUnion<D9[5]>));
219   EXPECT_EQ(sizeof(D9[8]), sizeof(AlignedCharArrayUnion<D9[8]>));
220   EXPECT_EQ(sizeof(D9[13]), sizeof(AlignedCharArrayUnion<D9[13]>));
221   EXPECT_EQ(sizeof(D9[16]), sizeof(AlignedCharArrayUnion<D9[16]>));
222   EXPECT_EQ(sizeof(D9[21]), sizeof(AlignedCharArrayUnion<D9[21]>));
223   EXPECT_EQ(sizeof(D9[32]), sizeof(AlignedCharArrayUnion<D9[32]>));
224   EXPECT_EQ(sizeof(V1), sizeof(AlignedCharArrayUnion<V1>));
225   EXPECT_EQ(sizeof(V2), sizeof(AlignedCharArrayUnion<V2>));
226   EXPECT_EQ(sizeof(V3), sizeof(AlignedCharArrayUnion<V3>));
227   EXPECT_EQ(sizeof(V4), sizeof(AlignedCharArrayUnion<V4>));
228   EXPECT_EQ(sizeof(V5), sizeof(AlignedCharArrayUnion<V5>));
229   EXPECT_EQ(sizeof(V6), sizeof(AlignedCharArrayUnion<V6>));
230   EXPECT_EQ(sizeof(V7), sizeof(AlignedCharArrayUnion<V7>));
231 
232   // Some versions of MSVC also get this wrong. The failure again appears to be
233   // benign: sizeof(V8) is only 52 bytes, but our array reserves 56.
234 #ifndef _MSC_VER
235   EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>));
236 #endif
237 
238   EXPECT_EQ(1u, (alignof(AlignedCharArray<1, 1>)));
239   EXPECT_EQ(2u, (alignof(AlignedCharArray<2, 1>)));
240   EXPECT_EQ(4u, (alignof(AlignedCharArray<4, 1>)));
241   EXPECT_EQ(8u, (alignof(AlignedCharArray<8, 1>)));
242   EXPECT_EQ(16u, (alignof(AlignedCharArray<16, 1>)));
243 
244   EXPECT_EQ(1u, sizeof(AlignedCharArray<1, 1>));
245   EXPECT_EQ(7u, sizeof(AlignedCharArray<1, 7>));
246   EXPECT_EQ(2u, sizeof(AlignedCharArray<2, 2>));
247   EXPECT_EQ(16u, sizeof(AlignedCharArray<2, 16>));
248 }
249 } // end anonymous namespace
250