gcc/testsuite/gcc.dg/Warray-bounds.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -Warray-bounds" } */
   3
   4 int a[10];
   5
   6 static inline int n(void) {
   7     __SIZE_TYPE__ strlen(const char *s);
   8     return strlen("12345");
   9 }
  10
  11 void g(int *p);
  12 void h(int p);
  13
  14 void bar (void *);
  15
  16 int* f(void) {
  17     int b[10];
  18     int i;
  19     struct {
  20        int c[10];
  21     } c;
  22
  23     a[-1] = 0;             /* { dg-warning "6:array subscript" } */
  24     a[ 0] = 0;
  25     a[ 1] = 0;
  26
  27
  28     a[ 9] = 0;
  29     a[10] = 0;             /* { dg-warning "6:array subscript" } */
  30     a[11] = 0;             /* { dg-warning "6:array subscript" } */
  31     bar (a);
  32     a[2 * n() - 11] = 1;    /* { dg-warning "6:array subscript" } */
  33     a[2 * n() - 10] = 1;
  34     a[2 * n() -  1] = 1;
  35     a[2 * n() -  0] = 1;    /* { dg-warning "6:array subscript" } */
  36     bar (a);
  37
  38     b[-1] = 0;             /* { dg-warning "6:array subscript" } */
  39     b[ 0] = 0;
  40     b[ 1] = 0;
  41     b[ 9] = 0;
  42     b[10] = 0;             /* { dg-warning "6:array subscript" } */
  43     b[11] = 0;             /* { dg-warning "6:array subscript" } */
  44     bar (b);
  45     b[2 * n() - 11] = 1;    /* { dg-warning "6:array subscript" } */
  46     b[2 * n() - 10] = 1;
  47     b[2 * n() -  1] = 1;
  48     b[2 * n() -  0] = 1;    /* { dg-warning "array subscript" } */
  49
  50     c.c[-1] = 0;           /* { dg-warning "8:array subscript" } */
  51     c.c[ 0] = 0;
  52     c.c[ 1] = 0;
  53     c.c[ 9] = 0;
  54     c.c[10] = 0;           /* { dg-warning "8:array subscript" } */
  55     c.c[11] = 0;           /* { dg-warning "8:array subscript" } */
  56     bar (&c);
  57     c.c[2 * n() - 11] = 1;  /* { dg-warning "8:array subscript" } */
  58     c.c[2 * n() - 10] = 1;
  59     c.c[2 * n() -  1] = 1;
  60     c.c[2 * n() -  0] = 1;  /* { dg-warning "8:array subscript" } */
  61
  62     g(&a[8]);
  63     g(&a[9]);
  64     g(&a[10]);
  65     g(&a[11]);             /* { dg-warning "array subscript" } */
  66     g(&a[-30]+10);             /* { dg-warning "array subscript" } */
  67     g(&a[-30]+30);
  68
  69     g(&b[10]);
  70     g(&c.c[10]);
  71     g(&b[11]);             /* { dg-warning "array subscript" } */
  72     g(&c.c[11]);           /* { dg-warning "array subscript" } */
  73
  74     g(&a[0]);
  75     g(&b[0]);
  76     g(&c.c[0]);
  77
  78     g(&a[-1]);             /* { dg-warning "array subscript" } */
  79     g(&b[-1]);             /* { dg-warning "array subscript" } */
  80     h(sizeof a[-1]);
  81     h(sizeof a[10]);
  82     h(sizeof b[-1]);
  83     h(sizeof b[10]);
  84     h(sizeof c.c[-1]);
  85     h(sizeof c.c[10]);
  86
  87     if (10 < 10)
  88        a[10] = 0;
  89     if (10 < 10)
  90        b[10] = 0;
  91     if (-1 >= 0)
  92        c.c[-1] = 0;
  93
  94     for (i = 20; i < 30; ++i)
  95              a[i] = 1;       /* { dg-warning "15:array subscript" } */
  96
  97     bar (b);
  98     bar (&c);
  99     return a;
 100 }
 101