1 /* bf-no-ms-layout.c */
2
3 /* Test for gcc bitfield layout, with -mno-ms-bitfields */
4 /* Adapted from Donn Terry <donnte@microsoft.com> testcase
5 posted to GCC-patches
6 http://gcc.gnu.org/ml/gcc-patches/2000-08/msg00577.html */
7
8 /* { dg-do run { target *-*-mingw* *-*-cygwin* i?86-*-darwin } } */
9 /* { dg-options "-mno-ms-bitfields" } */
10
11 #include <stddef.h>
12 #include <string.h>
13
14 extern void abort();
15
16 #pragma pack(8)
17
18 struct one {
19 int d;
20 unsigned char a;
21 unsigned short b:7;
22 char c;
23 };
24
25 struct two {
26 int d;
27 unsigned char a;
28 unsigned int b:7;
29 char c;
30 };
31
32 struct three {
33 short d;
34 unsigned short a:3;
35 unsigned short b:9;
36 unsigned char c:7;
37 };
38
39
40 /* Bitfields of size 0 have some truly odd behaviors. */
41
42 struct four {
43 unsigned short a:3;
44 unsigned short b:9;
45 unsigned int :0; /* forces struct alignment to int */
46 unsigned char c:7;
47 };
48
49 struct five {
50 char a;
51 int :0; /* ignored; prior field is not a bitfield. */
52 char b;
53 char c;
54 };
55
56 struct six {
57 char a :8;
58 int :0; /* not ignored; prior field IS a bitfield, causes
59 struct alignment as well. */
60 char b;
61 char c;
62 } ;
63
64 struct seven {
65 char a:8;
66 char :0;
67 int :0; /* Ignored; prior field is zero size bitfield. */
68 char b;
69 char c;
70 };
71
72 struct eight { /* ms size 4 */
73 short b:3;
74 char c;
75 };
76
77 #ifdef _MSC_VER
78 #define LONGLONG __int64
79 #else
80 #define LONGLONG long long
81 #endif
82
83 union nine { /* ms size 8 */
84 LONGLONG a:3;
85 char c;
86 };
87
88 struct ten { /* ms size 16 */
89 LONGLONG a:3;
90 LONGLONG b:3;
91 char c;
92 };
93
94
95 #define val(s,f) (s.f)
96
97 #define check_struct(_X) \
98 { \
99 if (sizeof (struct _X) != exp_sizeof_##_X ) \
100 abort(); \
101 memcpy(&test_##_X, filler, sizeof(test_##_X));\
102 if (val(test_##_X,c) != exp_##_X##_c) \
103 abort(); \
104 }
105
106 #define check_union(_X) \
107 { \
108 if (sizeof (union _X) != exp_sizeof_##_X ) \
109 abort(); \
110 memcpy(&test_##_X, filler, sizeof(test_##_X));\
111 if (val(test_##_X,c) != exp_##_X##_c) \
112 abort(); \
113 }
114
115 #define check_struct_size(_X) \
116 { \
117 if (sizeof (struct _X) != exp_sizeof_##_X ) \
118 abort(); \
119 }
120
121 #define check_struct_off(_X) \
122 { \
123 memcpy(&test_##_X, filler, sizeof(test_##_X));\
124 if (val(test_##_X,c) != exp_##_X##_c) \
125 abort(); \
126 }
127
128 #define check_union_size(_X) \
129 { \
130 if (sizeof (union _X) != exp_sizeof_##_X ) \
131 abort(); \
132 }
133
134 #define check_union_off(_X) \
135 { \
136 memcpy(&test_##_X, filler, sizeof(test_##_X));\
137 if (val(test_##_X,c) != exp_##_X##_c) \
138 abort(); \
139 }
140
141 int main(){
142
143 unsigned char filler[16];
144 struct one test_one;
145 struct two test_two;
146 struct three test_three;
147 struct four test_four;
148 struct five test_five;
149 struct six test_six;
150 struct seven test_seven;
151 struct eight test_eight;
152 union nine test_nine;
153 struct ten test_ten;
154
155 #if defined (_TEST_MS_LAYOUT) || defined (_MSC_VER)
156 size_t exp_sizeof_one = 12;
157 size_t exp_sizeof_two = 16;
158 size_t exp_sizeof_three =6;
159 size_t exp_sizeof_four = 8;
160 size_t exp_sizeof_five = 3;
161 size_t exp_sizeof_six = 8;
162 size_t exp_sizeof_seven = 3;
163 size_t exp_sizeof_eight = 4;
164 size_t exp_sizeof_nine = 8;
165 size_t exp_sizeof_ten = 16;
166
167 unsigned char exp_one_c = 8;
168 unsigned char exp_two_c = 12;
169 unsigned char exp_three_c = 4;
170 unsigned char exp_four_c = 4;
171 char exp_five_c = 2;
172 char exp_six_c = 5;
173 char exp_seven_c = 2;
174 char exp_eight_c = 2;
175 char exp_nine_c = 0;
176 char exp_ten_c = 8;
177
178 #else /* testing -mno-ms-bitfields */
179
180 size_t exp_sizeof_one = 8;
181 size_t exp_sizeof_two = 8;
182 size_t exp_sizeof_three = 6;
183 size_t exp_sizeof_four = 6;
184 size_t exp_sizeof_five = 6;
185 size_t exp_sizeof_six = 6;
186 size_t exp_sizeof_seven = 6;
187 size_t exp_sizeof_eight = 2;
188 size_t exp_sizeof_nine = 8;
189 size_t exp_sizeof_ten = 8;
190
191 unsigned short exp_one_c = 6;
192 unsigned int exp_two_c = 6;
193 unsigned char exp_three_c = 64;
194 unsigned char exp_four_c = 4;
195 char exp_five_c = 5;
196 char exp_six_c = 5;
197 char exp_seven_c = 5;
198 char exp_eight_c = 1;
199 char exp_nine_c = 0;
200 char exp_ten_c = 1;
201
202 #endif
203
204 unsigned char i;
205 for ( i = 0; i < 16; i++ )
206 filler[i] = i;
207
208 check_struct_off (one);
209 check_struct_off (two);
210 check_struct_off (three);
211 check_struct_off (four);
212 check_struct_off (five);
213 check_struct_off (six);
214 check_struct_off (seven);
215 check_struct_off (eight);
216 check_union_off (nine);
217 check_struct_off (ten);
218
219 check_struct_size (one);
220 check_struct_size (two);
221 check_struct_size (three);
222 check_struct_size (four);
223 check_struct_size (five);
224 check_struct_size (six);
225 check_struct_size (seven);
226 check_struct_size (eight);
227 check_union_size (nine);
228 check_struct_size (ten);
229
230 return 0;
231 };