mcs/tests/test-643.cs

   1 // Compiler options: -unsafe
   2
   3 using System;
   4
   5 class PointerArithmeticTest
   6 {
   7         unsafe public static int Main()
   8         {
   9                 try {
  10                         return CheckAdd((byte*)(-1), -1);
  11                 } catch (System.OverflowException) {}
  12
  13                 try {
  14                         return CheckSub((short*)(-1), int.MaxValue);
  15                 } catch (System.OverflowException) {}
  16
  17                 CheckSub2((short*)(-1), int.MaxValue);
  18
  19                 if ((long)Conversions (long.MaxValue) != (IntPtr.Size <= 4 ? uint.MaxValue : long.MaxValue))
  20                         return 5;
  21
  22                 Console.WriteLine ("OK");
  23                 return 0;
  24         }
  25
  26         unsafe static int* Conversions (long b)
  27         {
  28                 return (int*)b;
  29         }
  30
  31         unsafe static int CheckAdd(byte* ptr, int offset)
  32         {
  33                 if (checked(ptr + offset < ptr))
  34                         return 1;
  35
  36                 return 101;
  37         }
  38
  39         unsafe static int CheckSub(short* ptr, int offset)
  40         {
  41                 if (checked(ptr - offset < ptr))
  42                         return 2;
  43
  44                 return 102;
  45         }
  46
  47         unsafe static int CheckSub2(short* ptr, int offset)
  48         {
  49                 short* b = ptr + offset;
  50                 if (checked(ptr - b < 0))
  51                         return 3;
  52
  53                 return 0;
  54         }
  55 }