1 /* PR tree-optimization/79376 - wrong lower bound with %s and non-constant
2 strings in -Wformat-overflow
3 { dg-do compile }
4 { dg-options "-O2 -fdump-tree-optimized" } */
5
6 #define CAT(s, n) s ## n
7 #define FAIL(line) CAT (failure_on_line_, line)
8
9 /* Emit a call to a function named failure_on_line_NNN when EXPR is false. */
10 #define ASSERT(expr) \
11 do { \
12 extern void FAIL (__LINE__)(void); \
13 if (!(expr)) FAIL (__LINE__)(); \
14 } while (0)
15
16 #define KEEP(line) CAT (keep_call_on_line_, line)
17
18 /* Emit a call to a function named keep_call_on_line_NNN when EXPR is true.
19 Used to verify that the expression need not be the only one that holds. */
20 #define ASSERT_MAYBE(expr) \
21 do { \
22 extern void KEEP (__LINE__)(void); \
23 if (expr) KEEP (__LINE__)(); \
24 } while (0)
25
26 struct Arrays
27 {
28 char a1[1];
29 char a2[2];
30 char a3[3];
31 char a4[4];
32 char a5[5];
33 char ax[];
34 };
35
test_arrays(int i,struct Arrays * a)36 void test_arrays (int i, struct Arrays *a)
37 {
38 {
39 const char *s = i < 0 ? a->a3 : a->a1;
40
41 int n = __builtin_snprintf (0, 0, "%-s", s);
42
43 ASSERT (0 <= n && n < 3);
44
45 ASSERT_MAYBE (0 == n);
46 ASSERT_MAYBE (1 == n);
47 ASSERT_MAYBE (2 == n);
48 }
49
50 {
51 const char *s = i < 0 ? a->a3 : a->a5;
52
53 int n = __builtin_snprintf (0, 0, "%-s", s);
54
55 ASSERT (0 <= n && n < 5);
56
57 ASSERT_MAYBE (0 == n);
58 ASSERT_MAYBE (1 == n);
59 ASSERT_MAYBE (2 == n);
60 ASSERT_MAYBE (3 == n);
61 ASSERT_MAYBE (4 == n);
62 }
63 }
64
test_string_and_array(int i,struct Arrays * a)65 void test_string_and_array (int i, struct Arrays *a)
66 {
67 {
68 const char *s = i < 0 ? a->a3 : "1";
69
70 int n = __builtin_snprintf (0, 0, "%-s", s);
71
72 ASSERT (0 <= n && n < 3);
73
74 ASSERT_MAYBE (0 == n);
75 ASSERT_MAYBE (1 == n);
76 ASSERT_MAYBE (2 == n);
77 }
78
79 {
80 const char *s = i < 0 ? "12" : a->a5;
81
82 int n = __builtin_snprintf (0, 0, "%-s", s);
83
84 ASSERT (0 <= n && n < 5);
85
86 ASSERT_MAYBE (0 == n);
87 ASSERT_MAYBE (1 == n);
88 ASSERT_MAYBE (2 == n);
89 ASSERT_MAYBE (3 == n);
90 ASSERT_MAYBE (4 == n);
91 }
92
93 {
94 const char *s = i < 0 ? a->a4 : 0 < i ? "12" : a->a5;
95
96 int n = __builtin_snprintf (0, 0, "%-s", s);
97
98 ASSERT (0 <= n && n < 5);
99
100 ASSERT_MAYBE (0 == n);
101 ASSERT_MAYBE (1 == n);
102 ASSERT_MAYBE (2 == n);
103 ASSERT_MAYBE (3 == n);
104 ASSERT_MAYBE (4 == n);
105 }
106 }
107
108 /* { dg-final { scan-tree-dump-not "failure_on_line" "optimized"} }
109 { dg-final { scan-tree-dump-times "keep_call_on_line" 21 "optimized"} } */
110