gcc/testsuite/gcc.dg/Wparentheses-2.c

   1 /* Test operation of -Wparentheses.  Warnings for X<=Y<=Z should be
   2    there rather than hidden in -Wextra.  */
   3 /* Origin: Joseph Myers <jsm@polyomino.org.uk> */
   4
   5 /* { dg-do compile } */
   6 /* { dg-options "-Wparentheses" } */
   7
   8 int foo (int);
   9
  10 int
  11 bar (int a, int b, int c)
  12 {
  13   foo (a <= b <= c); /* { dg-warning "mathematical meaning" "correct warning" } */
  14   foo ((a <= b) <= c);
  15   foo (a <= (b <= c));
  16   foo (1 <= 2 <= c); /* { dg-warning "mathematical meaning" "correct warning" } */
  17   foo ((1 <= 2) <= c);
  18   foo (1 <= (2 <= c));
  19   foo (1 <= 2 <= 3); /* { dg-warning "mathematical meaning" "correct warning" } */
  20   foo ((1 <= 2) <= 3);
  21   foo (1 <= (2 <= 3));
  22   foo (a > b > c); /* { dg-warning "mathematical meaning" "correct warning" } */
  23   foo ((a > b) > c);
  24   foo (a > (b > c));
  25   foo (1 > 2 > c); /* { dg-warning "mathematical meaning" "correct warning" } */
  26   foo ((1 > 2) > c);
  27   foo (1 > (2 > c));
  28   foo (1 > 2 > 3); /* { dg-warning "mathematical meaning" "correct warning" } */
  29   foo ((1 > 2) > 3);
  30   foo (1 > (2 > 3));
  31   foo (a < b <= c); /* { dg-warning "mathematical meaning" "correct warning" } */
  32   foo ((a < b) <= c);
  33   foo (a < (b <= c));
  34   foo (1 < 2 <= c); /* { dg-warning "mathematical meaning" "correct warning" } */
  35   foo ((1 < 2) <= c);
  36   foo (1 < (2 <= c));
  37   foo (1 < 2 <= 3); /* { dg-warning "mathematical meaning" "correct warning" } */
  38   foo ((1 < 2) <= 3);
  39   foo (1 < (2 <= 3));
  40   foo (a <= b > c); /* { dg-warning "mathematical meaning" "correct warning" } */
  41   foo ((a <= b) > c);
  42   foo (a <= (b > c));
  43   foo (1 <= 2 > c); /* { dg-warning "mathematical meaning" "correct warning" } */
  44   foo ((1 <= 2) > c);
  45   foo (1 <= (2 > c));
  46   foo (1 <= 2 > 3); /* { dg-warning "mathematical meaning" "correct warning" } */
  47   foo ((1 <= 2) > 3);
  48   foo (1 <= (2 > 3));
  49   foo (a <= b == c); /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  50   foo ((a <= b) == c);
  51   foo (a <= (b == c));
  52   foo (1 <= 2 == c); /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  53   foo ((1 <= 2) == c);
  54   foo (1 <= (2 == c));
  55   foo (1 <= 2 == 3); /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  56   foo ((1 <= 2) == 3);
  57   foo (1 <= (2 == 3));
  58   foo (a != b != c); /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  59   foo ((a != b) != c);
  60   foo (a != (b != c));
  61   foo (1 != 2 != c); /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  62   foo ((1 != 2) != c);
  63   foo (1 != (2 != c));
  64   foo (1 != 2 != 3); /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  65   foo ((1 != 2) != 3);
  66   foo (1 != (2 != 3));
  67   foo (a < b == c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  68   foo ((a < b) == c);
  69   foo (a < (b == c));
  70   foo (a > b == c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  71   foo ((a > b) == c);
  72   foo (a > (b == c));
  73   foo (a == b < c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  74   foo ((a == b) < c);
  75   foo (a == (b < c));
  76   foo (a == b > c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  77   foo ((a == b) > c);
  78   foo (a == (b > c));
  79   foo (a == b == c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  80   foo ((a == b) == c);
  81   foo (a == (b == c));
  82   foo (1 == 2 == 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  83   foo ((1 == 2) == 3);
  84   foo (1 == (2 == 3));
  85   foo (1 < 2 == 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  86   foo ((1 < 2) == 3);
  87   foo (1 < (2 == 3));
  88   foo (1 > 2 == 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  89   foo ((1 > 2) == 3);
  90   foo (1 > (2 == 3));
  91   foo (1 == 2 < 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  92   foo ((1 == 2) < 3);
  93   foo (1 == (2 < 3));
  94   foo (1 == 2 > 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  95   foo ((1 == 2) > 3);
  96   foo (1 == (2 > 3));
  97   foo (a < b != c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
  98   foo ((a < b) != c);
  99   foo (a < (b != c));
 100   foo (a > b != c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
 101   foo ((a > b) != c);
 102   foo (a > (b != c));
 103   foo (a != b < c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
 104   foo ((a != b) < c);
 105   foo (a != (b < c));
 106   foo (a != b > c);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
 107   foo ((a != b) > c);
 108   foo (a != (b > c));
 109   foo (1 < 2 != 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
 110   foo ((1 < 2) != 3);
 111   foo (1 < (2 != 3));
 112   foo (1 > 2 != 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
 113   foo ((1 > 2) != 3);
 114   foo (1 > (2 != 3));
 115   foo (1 != 2 < 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
 116   foo ((1 != 2) < 3);
 117   foo (1 != (2 < 3));
 118   foo (1 != 2 > 3);  /* { dg-warning "suggest parentheses around comparison" "correct warning" } */
 119   foo ((1 != 2) > 3);
 120   foo (1 != (2 > 3));
 121 }