clang/test/SemaCXX/vla-construct.cpp

   1 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcxx-exceptions -fexceptions -O0 -verify -Wno-vla %s
   2 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcxx-exceptions -fexceptions -pedantic-errors -O0 -verify=pe %s
   3
   4 // expected-no-diagnostics
   5
   6 extern "C" int printf(const char*, ...);
   7
   8 static int N;
   9 struct S {
  10   S() __attribute__ ((nothrow))  { printf("%d: S()\n", ++N); }
  11   ~S()  __attribute__ ((nothrow))  { printf("%d: ~S()\n", N--); }
  12   int n[17];
  13 };
  14
  15 void print(int n, int a, int b, int c, int d) {
  16   printf("n=%d\n,sizeof(S)=%d\nsizeof(array_t[0][0])=%d\nsizeof(array_t[0])=%d\nsizeof(array_t)=%d\n",
  17          n, a, b, c, d);
  18   if (n == 2) throw(n);
  19 }
  20
  21 void test(int n) {
  22   S array_t[n][n+1]; // pe-error 2{{variable length arrays in C++ are a Clang extension}} pe-note 2{{parameter}} pe-note@-1 2{{here}}
  23   int sizeof_S = sizeof(S);
  24   int sizeof_array_t_0_0 = sizeof(array_t[0][0]);
  25   int sizeof_array_t_0 = sizeof(array_t[0]);
  26   int sizeof_array_t = sizeof(array_t);
  27   print(n, sizeof_S, sizeof_array_t_0_0, sizeof_array_t_0, sizeof_array_t);
  28 }
  29
  30 int main()
  31 {
  32   try {
  33     test(2);
  34   } catch(int e) {
  35     printf("exception %d\n", e);
  36   }
  37   try {
  38     test(3);
  39   } catch(int e) {
  40     printf("exception %d", e);
  41   }
  42 }