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 int* f(void) {
  15     int b[10];
  16     int i;
  17     struct {
  18        int c[10];
  19     } c;
  20
  21     a[-1] = 0;             /* { dg-warning "6:array subscript" } */
  22     a[ 0] = 0;
  23     a[ 1] = 0;
  24
  25
  26     a[ 9] = 0;
  27     a[10] = 0;             /* { dg-warning "6:array subscript" } */
  28     a[11] = 0;             /* { dg-warning "6:array subscript" } */
  29     a[2 * n() - 11] = 1;    /* { dg-warning "6:array subscript" } */
  30     a[2 * n() - 10] = 1;
  31     a[2 * n() -  1] = 1;
  32     a[2 * n() -  0] = 1;    /* { dg-warning "6:array subscript" } */
  33
  34     b[-1] = 0;             /* { dg-warning "6:array subscript" } */
  35     b[ 0] = 0;
  36     b[ 1] = 0;
  37     b[ 9] = 0;
  38     b[10] = 0;             /* { dg-warning "6:array subscript" } */
  39     b[11] = 0;             /* { dg-warning "6:array subscript" } */
  40     b[2 * n() - 11] = 1;    /* { dg-warning "6:array subscript" } */
  41     b[2 * n() - 10] = 1;
  42     b[2 * n() -  1] = 1;
  43     b[2 * n() -  0] = 1;    /* { dg-warning "array subscript" } */
  44
  45     c.c[-1] = 0;           /* { dg-warning "8:array subscript" } */
  46     c.c[ 0] = 0;
  47     c.c[ 1] = 0;
  48     c.c[ 9] = 0;
  49     c.c[10] = 0;           /* { dg-warning "8:array subscript" } */
  50     c.c[11] = 0;           /* { dg-warning "8:array subscript" } */
  51     c.c[2 * n() - 11] = 1;  /* { dg-warning "8:array subscript" } */
  52     c.c[2 * n() - 10] = 1;
  53     c.c[2 * n() -  1] = 1;
  54     c.c[2 * n() -  0] = 1;  /* { dg-warning "8:array subscript" } */
  55
  56     g(&a[8]);
  57     g(&a[9]);
  58     g(&a[10]);
  59     g(&a[11]);             /* { dg-warning "array subscript" "" { xfail *-*-* } } */
  60     g(&a[-30]+10);             /* { dg-warning "array subscript" } */
  61     g(&a[-30]+30);
  62
  63     g(&b[10]);
  64     g(&c.c[10]);
  65     g(&b[11]);             /* { dg-warning "array subscript" "" { xfail *-*-* } } */
  66     g(&c.c[11]);           /* { dg-warning "array subscript" } */
  67
  68     g(&a[0]);
  69     g(&b[0]);
  70     g(&c.c[0]);
  71
  72     g(&a[-1]);             /* { dg-warning "array subscript" } */
  73     g(&b[-1]);             /* { dg-warning "array subscript" } */
  74     h(sizeof a[-1]);
  75     h(sizeof a[10]);
  76     h(sizeof b[-1]);
  77     h(sizeof b[10]);
  78     h(sizeof c.c[-1]);
  79     h(sizeof c.c[10]);
  80
  81     if (10 < 10)
  82        a[10] = 0;
  83     if (10 < 10)
  84        b[10] = 0;
  85     if (-1 >= 0)
  86        c.c[-1] = 0;
  87
  88     for (i = 20; i < 30; ++i)
  89              a[i] = 1;       /* { dg-warning "15:array subscript" } */
  90
  91     return a;
  92 }
  93