1 /* PR 71831 - __builtin_object_size poor results with no optimization
2 Verify that even without optimization __builtin_object_size result
3 is folded into a constant and dead code that depends on it is
4 eliminated. */
5 /* { dg-do compile } */
6 /* { dg-options "-O0 -fdump-tree-ssa" } */
7
8 #define concat(a, b) a ## b
9 #define CAT(a, b) concat (a, b)
10
11 /* Create a symbol name unique to each tes and object size type. */
12 #define SYM(type) CAT (CAT (CAT (failure_on_line_, __LINE__), _type_), type)
13
14 /* References to the following undefined symbol which is unique for each
15 test case are expected to be eliminated. */
16 #define TEST_FAILURE(type) \
17 do { \
18 extern void SYM (type)(void); \
19 SYM (type)(); \
20 } while (0)
21
22 #define bos(obj, type) __builtin_object_size (obj, type)
23 #define size(obj, n) ((size_t)n == X ? sizeof *obj : (size_t)n)
24
25 #define test(expect, type, obj) \
26 do { \
27 if (bos (obj, type) != size (obj, expect)) \
28 TEST_FAILURE (type); \
29 } while (0)
30
31 #define FOLD_ALL(r0, r1, r2, r3, obj) \
32 do { \
33 test (r0, 0, obj); \
34 test (r1, 1, obj); \
35 test (r2, 2, obj); \
36 test (r3, 3, obj); \
37 } while (0)
38
39 #define FOLD_0_2(r0, r1, r2, r3, obj) \
40 do { \
41 test (r0, 0, obj); \
42 test (r2, 2, obj); \
43 } while (0)
44
45 /* For convenience. Substitute for 'sizeof object' in test cases where
46 the size can vary from target to target. */
47 #define X (size_t)0xdeadbeef
48
49 typedef __SIZE_TYPE__ size_t;
50
51 extern char ax[];
52 char ax2[]; /* { dg-warning "assumed to have one element" } */
53
54 extern char a0[0];
55 static char a1[1];
56 static char a2[2];
57 static char a9[9];
58
59 #if __SIZEOF_SHORT__ == 4
60 extern short ia0[0];
61 static short ia1[1];
62 static short ia9[9];
63 #elif __SIZEOF_INT__ == 4
64 extern int ia0[0];
65 static int ia1[1];
66 static int ia9[9];
67 #elif __SIZEOF_LONG__ == 4
68 extern long ia0[0];
69 static long ia1[1];
70 static long ia9[9];
71 #endif
72
73 static char a2x2[2][2];
74 static char a3x5[3][5];
75
76 struct Sx { char n, a[]; } sx;
77 struct S0 { char n, a[0]; } s0;
78 struct S1 { char n, a[1]; } s1;
79 struct S2 { char n, a[2]; } s2;
80 struct S9 { char n, a[9]; } s9;
81
82 struct S2x2 { char n, a[2][2]; } s2x2;
83 struct S3x5 { char n, a[3][5]; } s3x5;
84
85 static __attribute__ ((noclone, noinline)) void
test_arrays()86 test_arrays ()
87 {
88 FOLD_ALL ( 1, 1, 1, 1, ax2);
89
90 FOLD_ALL ( 1, 1, 1, 1, a1);
91 FOLD_ALL ( 2, 2, 2, 2, a2);
92 FOLD_ALL ( 9, 9, 9, 9, a9);
93
94 FOLD_ALL ( 0, 0, 0, 0, a0);
95 FOLD_ALL ( 1, 1, 1, 1, ax2);
96
97 FOLD_ALL ( 0, 0, 0, 0, ia0);
98 FOLD_ALL ( 4, 4, 4, 4, ia1);
99 FOLD_ALL ( 36, 36, 36, 36, ia9);
100
101 /* Not all results for multidimensional arrays make sense (see
102 bug 77293). The expected results below simply reflect those
103 obtained at -O2 (modulo the known limitations at -O1). */
104 FOLD_ALL ( 4, 4, 4, 4, a2x2);
105 FOLD_ALL ( 4, 4, 4, 4, &a2x2[0]);
106 FOLD_ALL ( 4, 2, 4, 2, &a2x2[0][0]);
107 FOLD_0_2 ( 0, F1 (0), 0, 0, &a2x2 + 1);
108 FOLD_0_2 ( 2, F1 ( 2), 2, F3 ( 2), &a2x2[0] + 1);
109 FOLD_0_2 ( 3, F1 ( 1), 3, F3 ( 3), &a2x2[0][0] + 1);
110
111 FOLD_ALL ( 15, 15, 15, 15, a3x5);
112 FOLD_ALL ( 15, 5, 15, 5, &a3x5[0][0] + 0);
113 FOLD_0_2 ( 14, F1 ( 4), 14, F3 (14), &a3x5[0][0] + 1);
114
115 FOLD_ALL ( 1, 1, 1, 1, a1 + 0);
116 FOLD_0_2 ( 0, F1 ( 0), 0, 0, &a1 + 1);
117 FOLD_ALL ( 2, 2, 2, 2, a2 + 0);
118 FOLD_0_2 ( 1, F1 ( 1), 1, F3 ( 1), a2 + 1);
119 FOLD_0_2 ( 0, F1 ( 0), 0, 0, a2 + 2);
120 }
121
122 static __attribute__ ((noclone, noinline)) void
test_structs(void)123 test_structs (void)
124 {
125 /* The expected size of a declared object with a flexible array member
126 is sizeof sx in all __builtin_object_size types. */
127 FOLD_ALL ( X, X, X, X, &sx);
128
129 /* The expected size of a flexible array member of a declared object
130 is zero. */
131 FOLD_ALL ( 0, 0, 0, 0, sx.a);
132
133 /* The expected size of a declared object with a zero-length array member
134 is sizeof sx in all __builtin_object_size types. */
135 FOLD_ALL ( X, X, X, X, &s0);
136
137 /* The expected size of a zero-length array member of a declared object
138 is zero. */
139 FOLD_ALL ( 0, 0, 0, 0, s0.a);
140
141 FOLD_ALL ( X, X, X, X, &s1);
142 FOLD_ALL ( 1, 1, 1, 1, s1.a);
143 FOLD_0_2 ( 0, F1 (0), 0, 0, s1.a + 1);
144
145 FOLD_ALL ( X, X, X, X, &s9);
146 FOLD_ALL ( 9, 9, 9, 9, s9.a);
147 FOLD_ALL ( 9, 9, 9, 9, s9.a + 0);
148 FOLD_0_2 ( 8, F1 ( 8), 8, F3 ( 8), s9.a + 1);
149 FOLD_0_2 ( 7, F1 ( 7), 7, F3 ( 7), s9.a + 2);
150 FOLD_0_2 ( 0, F1 ( 0), 0, F3 ( 0), s9.a + 9);
151 }
152
153 int
main()154 main()
155 {
156 test_arrays ();
157 test_structs ();
158
159 return 0;
160 }
161
162 /* { dg-final { scan-tree-dump-not "failure_on_line" "ssa" } } */
163