gcc/testsuite/gcc.dg/tree-ssa/pr79376.c

   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
  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
  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"} } */