clang/test/Sema/div-sizeof-ptr.cpp

   1 // RUN: %clang_cc1 %s -verify -Wsizeof-pointer-div -fsyntax-only
   2
   3 template <typename Ty, int N>
   4 int f(Ty (&Array)[N]) {
   5   return sizeof(Array) / sizeof(Ty); // Should not warn
   6 }
   7
   8 typedef int int32;
   9
  10 void test(int *p, int **q) {          // expected-note 6 {{pointer 'p' declared here}}
  11   const int *r;                       // expected-note {{pointer 'r' declared here}}
  12   int a1 = sizeof(p) / sizeof(*p);    // expected-warning {{'sizeof (p)' will return the size of the pointer, not the array itself}}
  13   int a2 = sizeof p / sizeof *p;      // expected-warning {{'sizeof p' will return the size of the pointer, not the array itself}}
  14   int a3 = sizeof(p) / sizeof(int);   // expected-warning {{'sizeof (p)' will return the size of the pointer, not the array itself}}
  15   int a4 = sizeof(p) / sizeof(p[0]);  // expected-warning {{'sizeof (p)' will return the size of the pointer, not the array itself}}
  16   int a5 = sizeof(p) / sizeof(int32); // expected-warning {{'sizeof (p)' will return the size of the pointer, not the array itself}}
  17   int a6 = sizeof(r) / sizeof(int);   // expected-warning {{'sizeof (r)' will return the size of the pointer, not the array itself}}
  18
  19   int32 *d;                           // expected-note 2 {{pointer 'd' declared here}}
  20   int a7 = sizeof(d) / sizeof(int32); // expected-warning {{'sizeof (d)' will return the size of the pointer, not the array itself}}
  21   int a8 = sizeof(d) / sizeof(int);  // expected-warning {{'sizeof (d)' will return the size of the pointer, not the array itself}}
  22
  23   int a9 = sizeof(*q) / sizeof(**q); // expected-warning {{'sizeof (*q)' will return the size of the pointer, not the array itself}}
  24   int a10 = sizeof(p) / sizeof(decltype(*p)); // expected-warning {{'sizeof (p)' will return the size of the pointer, not the array itself}}
  25
  26   // Should not warn
  27   int b1 = sizeof(int *) / sizeof(int);
  28   int b2 = sizeof(p) / sizeof(p);
  29   int b3 = sizeof(*q) / sizeof(q);
  30   int b4 = sizeof(p) / sizeof(char);
  31
  32   int arr[10];
  33   int c1 = sizeof(arr) / sizeof(*arr);
  34   int c2 = sizeof(arr) / sizeof(arr[0]);
  35   int c3 = sizeof(arr) / sizeof(int);
  36
  37   int arr2[10][12];
  38   int d1 = sizeof(arr2) / sizeof(*arr2);
  39 }