gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-15.c

   1 /* PR middle-end/79692 - -Wformat-overflow false positive on an integer
   2    directive with unknown width
   3    { dg-do compile }
   4    { dg-options "-O2 -Wall -Wformat-overflow=1 -ftrack-macro-expansion=0" }
   5    { dg-require-effective-target int32plus } */
   6
   7 typedef __SIZE_TYPE__  size_t;
   8 typedef __WCHAR_TYPE__ wchar_t;
   9
  10 #define INT_MAX __INT_MAX__
  11 #define INT_MIN (-INT_MAX - 1)
  12
  13 /* When debugging, define LINE to the line number of the test case to exercise
  14    and avoid exercising any of the others.  The buffer and objsize macros
  15    below make use of LINE to avoid warnings for other lines.  */
  16 #ifndef LINE
  17 # define LINE 0
  18 #endif
  19
  20 void sink (char*, char*);
  21
  22 int dummy_sprintf (char*, const char*, ...);
  23
  24 char buffer [1024];
  25 extern char *ptr;
  26
  27 int int_range (int min, int max)
  28 {
  29   extern int int_value (void);
  30   int n = int_value ();
  31   return n < min || max < n ? min : n;
  32 }
  33
  34 unsigned uint_range (unsigned min, unsigned max)
  35 {
  36   extern unsigned uint_value (void);
  37   unsigned n = uint_value ();
  38   return n < min || max < n ? min : n;
  39 }
  40
  41 /* Evaluate to an array of SIZE characters when non-negative, or to
  42    a pointer to an unknown object otherwise.  */
  43 #define buffer(size)                                    \
  44   ((0 <= size) ? buffer + sizeof buffer - (size) : ptr)
  45
  46 /* Helper to expand function to either __builtin_f or dummy_f to
  47    make debugging GCC easy.  */
  48 #define FUNC(f)                                                 \
  49   ((!LINE || LINE == __LINE__) ? __builtin_ ## f : dummy_ ## f)
  50
  51 /* Macro to verify that calls to __builtin_sprintf (i.e., with no size
  52    argument) issue diagnostics by correctly determining the size of
  53    the destination buffer.  */
  54 #define T(size, ...)                                            \
  55   (FUNC (sprintf) (buffer (size),  __VA_ARGS__),                \
  56    sink (buffer, ptr))
  57
  58 /* Return a signed integer in the range [MIN, MAX].  */
  59 #define R(min, max)  int_range (min, max)
  60
  61 void test_unknown_width_integer (int w, int i)
  62 {
  63   T (10, "%*d", w, i);
  64   T (10, "%*d", w, R (0, 12345));
  65
  66   T (10, "%*i", w, i);
  67   T (10, "%*i", w, R (0, 12345));
  68
  69   T (10, "%*o", w, i);
  70   T (10, "%*o", w, R (0, 12345));
  71
  72   T (10, "%*i", w, i);
  73   T (10, "%*i", w, R (0, 12345));
  74 }
  75
  76 void test_unknown_width_floating (int w, double d)
  77 {
  78   T ( 7, "%*a", w, d);
  79   T (21, "%*a", w, 3.141);
  80
  81   T (12, "%*e",  w, d);    /* { dg-warning "writing a terminating nul" } */
  82   T (12, "%#*e", w, d);    /* { dg-warning "writing a terminating nul" } */
  83   T (13, "%*e",  w, d);
  84   T (13, "%#*e", w, d);
  85   T (13, "%*e",  w, 3.141);
  86
  87   T ( 8, "%*f",  w, d);   /* { dg-warning "writing a terminating nul" } */
  88   T ( 8, "%#*f", w, d);   /* { dg-warning "writing a terminating nul" } */
  89   T ( 9, "%*f",  w, d);
  90   T ( 9, "%#*f", w, d);
  91   T ( 9, "%*f",  w, 3.141);
  92   T ( 9, "%#*f", w, 3.141);
  93
  94   T (12, "%*g", w, d);   /* { dg-warning "may write a terminating nul" } */
  95   T (13, "%*g", w, d);
  96   T (13, "%*g", w, 3.141);
  97 }
  98
  99 void test_unknown_precision_integer (int p, int i, double d)
 100 {
 101   T (10, "%.*d", p, i);
 102   T (10, "%.*d", p, R (0, 12345));
 103
 104   T (10, "%.*i", p, i);
 105   T (10, "%.*i", p, R (0, 12345));
 106
 107   T (10, "%.*o", p, i);
 108   T (10, "%.*o", p, R (0, 12345));
 109
 110   T (10, "%.*i", p, i);
 111   T (10, "%.*i", p, R (0, 12345));
 112 }
 113
 114 void test_unknown_precision_floating (int p, double d)
 115 {
 116   T ( 7, "%.*a", p, d);
 117   T (21, "%.*a", p, 3.141);
 118
 119   /* "%.0e", 0.0 results in 5 bytes: "0e+00"  */
 120   T ( 5, "%.*e",  p, d);      /* { dg-warning "writing a terminating nul" } */
 121   /* "%#.0e", 0.0 results in 6 bytes: "0.e+00"  */
 122   T ( 6, "%#.*e", p, d);      /* { dg-warning "writing a terminating nul" } */
 123   T ( 6, "%.*e",  p, d);
 124   T ( 6, "%.*e",  p, 3.141);
 125   T ( 6, "%#.*e", p, 3.141);  /* { dg-warning "writing a terminating nul" } */
 126   T ( 7, "%#.*e", p, 3.141);
 127
 128   /* "%.0f", 0.0 results in 1 byte: "0" but precision of at least 1
 129      is likely, resulting in "0.0".  */
 130   T ( 3, "%.*f",  p, d);   /* { dg-warning "may write a terminating nul" } */
 131   /* "%#.0f", 0.0 results in 2 bytes: "0." but precision of at least 1
 132      is likely, resulting in "0.0".  */
 133   T ( 3, "%#.*f", p, d);   /* { dg-warning "may write a terminating nul" } */
 134   T ( 4, "%.*f",  p, d);
 135   T ( 4, "%#.*f", p, d);
 136   T ( 3, "%.*f",  p, 3.141); /* { dg-warning "may write a terminating nul" } */
 137   T ( 4, "%.*f",  p, 3.141);
 138   T ( 3, "%#.*f", p, 3.141); /* { dg-warning "may write a terminating nul" } */
 139   T ( 4, "%#.*f", p, 3.141);
 140
 141   T (12, "%.*g",  p, d);   /* { dg-warning "may write a terminating nul" } */
 142   T (12, "%#.*g", p, d);   /* { dg-warning "may write a terminating nul" } */
 143   T (13, "%.*g",  p, d);
 144   T (13, "%#.*g", p, d);
 145   T ( 6, "%#.*g", R (-1, 0), d);/* { dg-warning "may write a terminating nul" } */
 146   T ( 7, "%#.*g", R (-1, 0), d);
 147   T ( 6, "%#.*g", R ( 0, 0), d);/* { dg-warning "may write a terminating nul" } */
 148   T ( 7, "%#.*g", R ( 0, 0), d);
 149   T ( 6, "%#.*g", R ( 0, 1), d);/* { dg-warning "may write a terminating nul" } */
 150   T ( 7, "%#.*g", R ( 0, 1), d);
 151   T ( 3, "%.*g",  p, 3.141); /* { dg-warning "may write a terminating nul" } */
 152   T ( 4, "%.*g",  p, 3.141);
 153   T ( 3, "%#.*g", p, 3.141); /* { dg-warning "may write a terminating nul" } */
 154   T ( 4, "%#.*g", p, 3.141);
 155 }
 156
 157
 158 void test_unknown_width_and_precision_integer (int w, int p, int i)
 159 {
 160   T (10, "%*.*d", w, p, i);
 161   T (10, "%*.*d", w, p, R (0, 12345));
 162
 163   T (10, "%*.*i", w, p, i);
 164   T (10, "%*.*i", w, p, R (0, 12345));
 165
 166   T (10, "%*.*o", w, p, i);
 167   T (10, "%*.*o", w, p, R (0, 12345));
 168
 169   T (10, "%*.*i", w, p, i);
 170   T (10, "%*.*i", w, p, R (0, 12345));
 171 }
 172
 173 void test_unknown_width_and_precision_floating (int w, int p, double d)
 174 {
 175   T ( 7, "%*.*a", w, p, d);
 176   T (21, "%*.*a", w, p, 3.141);
 177
 178   /* "%0.0e", 0.0 results in 5 bytes: "0e+00"  */
 179   T ( 5, "%*.*e",  w, p, d);   /* { dg-warning "writing a terminating nul" } */
 180   /* "%#0.0e", 0.0 results in 6 bytes: "0.e+00"  */
 181   T ( 6, "%#*.*e", w, p, d);   /* { dg-warning "writing a terminating nul" } */
 182   T ( 6, "%*.*e",  w, p, d);
 183   T ( 6, "%*.*e",  w, p, 3.141);
 184   T ( 6, "%#*.*e", w, p, 3.141);/* { dg-warning "writing a terminating nul" } */
 185   T ( 7, "%#*.*e", w, p, 3.141);
 186
 187   T ( 3, "%*.*f",  w, p, d);  /* { dg-warning "may write a terminating nul" } */
 188   T ( 3, "%#*.*f", w, p, d);  /* { dg-warning "may write a terminating nul" } */
 189   T ( 4, "%*.*f",  w, p, d);
 190   T ( 4, "%*.*f",  w, p, 3.141);
 191   T ( 4, "%#*.*f", w, p, 3.141);
 192
 193   T (13, "%*.*g",  w, p, d);
 194   T (13, "%#*.*g", w, p, d);
 195   T (13, "%*.*g",  w, p, 3.141);
 196   T (13, "%#*.*g", w, p, 3.141);
 197 }