gcc/testsuite/gcc.dg/pointer-array-quals-1.c

   1 /* { dg-do compile } */
   2 /* Origin: Martin Uecker <uecker@eecs.berkeley.edu> */
   3 /* { dg-options "-Wdiscarded-array-qualifiers" } */
   4 void tvoid(void* x);
   5 void transpose0(double* out, const double* in) { }
   6 void transpose1(double out[2][2], const double in[2][2]) { }
   7 void transpose2(double out[2][2][2], const double in[2][2][2]) { }
   8 // return
   9 int (*y2(const int x[3][3]))[3] { return x; } /* { dg-warning "return discards 'const' qualifier from pointer target type" } */
  10 const int (*y3(int x[3][3]))[3] { return x; }
  11 void test(void)
  12 {
  13         double x0[2];
  14         double y0[2];
  15         const double z0[4];
  16         double x1[2][2];
  17         double y1[2][2];
  18         double o1[2][3];
  19         const double z1[2][2];
  20         double x2[2][2][2];
  21         double y2[2][2][2];
  22         double o2[2][2][3];
  23         const double z2[2][2][2];
  24         // void pointers
  25         tvoid(x0);
  26         tvoid(x1);
  27         tvoid(x2);
  28         tvoid(z0); /* { dg-warning "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
  29         tvoid(z1); /* { dg-warning "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
  30         tvoid(z2); /* { dg-warning "passing argument 1 of 'tvoid' discards 'const' qualifier from pointer target type" } */
  31         void* p;
  32         const void* pc;
  33         p = x0;
  34         p = x1;
  35         p = x2;
  36         p = z0; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  37         p = z1; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  38         p = z2; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  39         pc = x0;
  40         pc = x1;
  41         pc = x2;
  42         pc = z0;
  43         pc = z1;
  44         pc = z2;
  45         transpose0(pc, p); /* { dg-warning "passing argument 1 of 'transpose0' discards 'const' qualifier from pointer target type" } */
  46         transpose1(pc, p); /* { dg-warning "passing argument 1 of 'transpose1' discards 'const' qualifier from pointer target type" } */
  47         transpose2(pc, p); /* { dg-warning "passing argument 1 of 'transpose2' discards 'const' qualifier from pointer target type" } */
  48         transpose0(p, pc);
  49         transpose1(p, pc);
  50         transpose2(p, pc);
  51         // passing as arguments
  52         transpose0(y0, x0);
  53         transpose1(y1, x1);
  54         transpose2(y2, x2);
  55         // initialization
  56         const double (*u0p) = x0;
  57         const double (*u1p)[2] = x1;
  58         const double (*u2p)[2][2] = x2;
  59         double (*v0p) = z0; /* { dg-warning "initialization discards 'const' qualifier from pointer target type" } */
  60         double (*v1p)[2] = z1; /* { dg-warning "initialization discards 'const' qualifier from pointer target type" } */
  61         double (*v2p)[2][2] = z2; /* { dg-warning "initialization discards 'const' qualifier from pointer target type" } */
  62         // subtraction
  63         &(x0[1]) - &(z0[0]);
  64         &(x1[1]) - &(z1[0]);
  65         &(x2[1]) - &(z2[0]);
  66         // comparison
  67         x0 == z0;
  68         x1 == z1;
  69         x2 == z2;
  70         x0 < z0;
  71         x1 < z1;
  72         x2 < z2;
  73         x0 > z0;
  74         x1 > z1;
  75         x2 > z2;
  76         // assignment
  77         u0p = x0;
  78         u1p = x1;
  79         u2p = x2;
  80         v0p = z0; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  81         v1p = z1; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  82         v2p = z2; /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  83         // conditional expressions
  84         (void)(1 ? x0 : z0);
  85         (void)(1 ? x1 : z1);
  86         (void)(1 ? x2 : z2);
  87         (void)(1 ? x0 : x1); /* { dg-warning "pointer type mismatch in conditional expression" } */
  88         (void)(1 ? x1 : x2); /* { dg-warning "pointer type mismatch in conditional expression" } */
  89         (void)(1 ? x2 : x0); /* { dg-warning "pointer type mismatch in conditional expression" } */
  90         v0p = (1 ? z0 : v0p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  91         v1p = (1 ? z1 : v1p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  92         v2p = (1 ? z2 : v2p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  93         v0p = (1 ? x0 : u0p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  94         v1p = (1 ? x1 : u1p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  95         v2p = (1 ? x2 : u2p); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
  96         (1 ? x0 : z0)[0] = 1; /* { dg-error "assignment of read-only location" } */
  97         (1 ? x1 : z1)[0][0] = 1; /* { dg-error "assignment of read-only location" } */
  98         (1 ? x2 : z2)[0][0][0] = 1; /* { dg-error "assignment of read-only location" } */
  99         v0p = (1 ? p : z0); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
 100         v1p = (1 ? p : z1); /* { dg-warning "pointer to array loses qualifier in conditional expression" } */
 101         v2p = (1 ? p : z2); /* { dg-warning "pointer to array loses qualifier in conditional expression" } */
 102         v0p = (1 ? pc : x0); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
 103         v1p = (1 ? pc : x1); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
 104         v2p = (1 ? pc : x2); /* { dg-warning "assignment discards 'const' qualifier from pointer target type" } */
 105 }
 106