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                         if (IntPtr.Size <= 4)
  15                                 return CheckSub((short*)(-1), int.MaxValue);
  16                         else
  17                                 return CheckSub((short*)(-1), long.MaxValue);
  18                 } catch (System.OverflowException) {}
  19
  20                 CheckSub2((short*)(-1), int.MaxValue);
  21
  22                 if ((long)Conversions (long.MaxValue) != (IntPtr.Size <= 4 ? uint.MaxValue : long.MaxValue))
  23                         return 5;
  24
  25                 Console.WriteLine ("OK");
  26                 return 0;
  27         }
  28
  29         unsafe static int* Conversions (long b)
  30         {
  31                 return (int*)b;
  32         }
  33
  34         unsafe static int CheckAdd(byte* ptr, int offset)
  35         {
  36                 if (checked(ptr + offset < ptr))
  37                         return 1;
  38
  39                 return 101;
  40         }
  41
  42         unsafe static int CheckSub(short* ptr, int offset)
  43         {
  44                 if (checked(ptr - offset < ptr))
  45                         return 2;
  46
  47                 return 102;
  48         }
  49
  50         unsafe static int CheckSub(short* ptr, long offset)
  51         {
  52                 if (checked(ptr - offset < ptr))
  53                         return 2;
  54
  55                 return 102;
  56         }
  57
  58         unsafe static int CheckSub2(short* ptr, int offset)
  59         {
  60                 short* b = ptr + offset;
  61                 if (checked(ptr - b < 0))
  62                         return 3;
  63
  64                 return 0;
  65         }
  66 }