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 #ifndef __builtin_object_size
53 char ax2[]; /* { dg-warning "assumed to have one element" } */
54 #endif
55
56 extern char a0[0];
57 static char a1[1];
58 static char a2[2];
59 static char a9[9];
60
61 #if __SIZEOF_SHORT__ == 4
62 extern short ia0[0];
63 static short ia1[1];
64 static short ia9[9];
65 #elif __SIZEOF_INT__ == 4
66 extern int ia0[0];
67 static int ia1[1];
68 static int ia9[9];
69 #elif __SIZEOF_LONG__ == 4
70 extern long ia0[0];
71 static long ia1[1];
72 static long ia9[9];
73 #endif
74
75 static char a2x2[2][2];
76 static char a3x5[3][5];
77
78 struct Sx { char n, a[]; } sx;
79 struct S0 { char n, a[0]; } s0;
80 struct S1 { char n, a[1]; } s1;
81 struct S2 { char n, a[2]; } s2;
82 struct S9 { char n, a[9]; } s9;
83
84 struct S2x2 { char n, a[2][2]; } s2x2;
85 struct S3x5 { char n, a[3][5]; } s3x5;
86
87 static __attribute__ ((noclone, noinline)) void
88 test_arrays ()
89 {
90 FOLD_ALL ( 1, 1, 1, 1, ax2);
91
92 FOLD_ALL ( 1, 1, 1, 1, a1);
93 FOLD_ALL ( 2, 2, 2, 2, a2);
94 FOLD_ALL ( 9, 9, 9, 9, a9);
95
96 FOLD_ALL ( 0, 0, 0, 0, a0);
97 FOLD_ALL ( 1, 1, 1, 1, ax2);
98
99 FOLD_ALL ( 0, 0, 0, 0, ia0);
100 FOLD_ALL ( 4, 4, 4, 4, ia1);
101 FOLD_ALL ( 36, 36, 36, 36, ia9);
102
103 /* Not all results for multidimensional arrays make sense (see
104 bug 77293). The expected results below simply reflect those
105 obtained at -O2 (modulo the known limitations at -O1). */
106 FOLD_ALL ( 4, 4, 4, 4, a2x2);
107 FOLD_ALL ( 4, 4, 4, 4, &a2x2[0]);
108 FOLD_ALL ( 4, 2, 4, 2, &a2x2[0][0]);
109 FOLD_0_2 ( 0, F1 (0), 0, 0, &a2x2 + 1);
110 FOLD_0_2 ( 2, F1 ( 2), 2, F3 ( 2), &a2x2[0] + 1);
111 FOLD_0_2 ( 3, F1 ( 1), 3, F3 ( 3), &a2x2[0][0] + 1);
112
113 FOLD_ALL ( 15, 15, 15, 15, a3x5);
114 FOLD_ALL ( 15, 5, 15, 5, &a3x5[0][0] + 0);
115 FOLD_0_2 ( 14, F1 ( 4), 14, F3 (14), &a3x5[0][0] + 1);
116
117 FOLD_ALL ( 1, 1, 1, 1, a1 + 0);
118 FOLD_0_2 ( 0, F1 ( 0), 0, 0, &a1 + 1);
119 FOLD_ALL ( 2, 2, 2, 2, a2 + 0);
120 FOLD_0_2 ( 1, F1 ( 1), 1, F3 ( 1), a2 + 1);
121 FOLD_0_2 ( 0, F1 ( 0), 0, 0, a2 + 2);
122 }
123
124 static __attribute__ ((noclone, noinline)) void
125 test_structs (void)
126 {
127 /* The expected size of a declared object with a flexible array member
128 is sizeof sx in all __builtin_object_size types. */
129 FOLD_ALL ( X, X, X, X, &sx);
130
131 /* The expected size of a flexible array member of a declared object
132 is zero. */
133 FOLD_ALL ( 0, 0, 0, 0, sx.a);
134
135 /* The expected size of a declared object with a zero-length array member
136 is sizeof sx in all __builtin_object_size types. */
137 FOLD_ALL ( X, X, X, X, &s0);
138
139 /* The expected size of a zero-length array member of a declared object
140 is zero. */
141 FOLD_ALL ( 0, 0, 0, 0, s0.a);
142
143 FOLD_ALL ( X, X, X, X, &s1);
144 FOLD_ALL ( 1, 1, 1, 1, s1.a);
145 FOLD_0_2 ( 0, F1 (0), 0, 0, s1.a + 1);
146
147 FOLD_ALL ( X, X, X, X, &s9);
148 FOLD_ALL ( 9, 9, 9, 9, s9.a);
149 FOLD_ALL ( 9, 9, 9, 9, s9.a + 0);
150 FOLD_0_2 ( 8, F1 ( 8), 8, F3 ( 8), s9.a + 1);
151 FOLD_0_2 ( 7, F1 ( 7), 7, F3 ( 7), s9.a + 2);
152 FOLD_0_2 ( 0, F1 ( 0), 0, F3 ( 0), s9.a + 9);
153 }
154
155 int
156 main()
157 {
158 test_arrays ();
159 test_structs ();
160
161 return 0;
162 }
163
164 /* { dg-final { scan-tree-dump-not "failure_on_line" "ssa" } } */