mcs/class/System.Private.CoreLib/System/DefaultBinder.cs

   1 using System.Reflection;
   2
   3 namespace System
   4 {
   5         partial class DefaultBinder
   6         {
   7                 // InvokeUtil::PrimitiveAttributes from coreclr
   8                 static readonly int[] PrimitiveAttributes = {
   9                         0x00,                     // ELEMENT_TYPE_END
  10                         0x00,                     // ELEMENT_TYPE_VOID
  11                         0x0004,    // ELEMENT_TYPE_BOOLEAN
  12                         0x3F88,    // ELEMENT_TYPE_CHAR (W = U2, CHAR, I4, U4, I8, U8, R4, R8) (U2 == Char)
  13                         0x3550,    // ELEMENT_TYPE_I1   (W = I1, I2, I4, I8, R4, R8)
  14                         0x3FE8,    // ELEMENT_TYPE_U1   (W = CHAR, U1, I2, U2, I4, U4, I8, U8, R4, R8)
  15                         0x3540,    // ELEMENT_TYPE_I2   (W = I2, I4, I8, R4, R8)
  16                         0x3F88,    // ELEMENT_TYPE_U2   (W = U2, CHAR, I4, U4, I8, U8, R4, R8)
  17                         0x3500,    // ELEMENT_TYPE_I4   (W = I4, I8, R4, R8)
  18                         0x3E00,    // ELEMENT_TYPE_U4   (W = U4, I8, R4, R8)
  19                         0x3400,    // ELEMENT_TYPE_I8   (W = I8, R4, R8)
  20                         0x3800,    // ELEMENT_TYPE_U8   (W = U8, R4, R8)
  21                         0x3000,    // ELEMENT_TYPE_R4   (W = R4, R8)
  22                         0x2000,    // ELEMENT_TYPE_R8   (W = R8)
  23                 };
  24
  25                 static bool IsPrimitiveType (CorElementType type) {
  26                         return (type >= CorElementType.Void && type <= CorElementType.R8) || type == CorElementType.I || type == CorElementType.U;
  27                 }
  28
  29                 static bool CanChangePrimitive (Type source, Type target)
  30                 {
  31                         var src = RuntimeTypeHandle.GetCorElementType ((RuntimeType)source);
  32                         var dst = RuntimeTypeHandle.GetCorElementType ((RuntimeType)target);
  33
  34                         if (!IsPrimitiveType (dst) || !IsPrimitiveType (src))
  35                                 return false;
  36                         // This handles I/U
  37                         if (src == dst)
  38                                 return true;
  39                         return ((1 << (int)dst) | PrimitiveAttributes [(int)src]) != 0;
  40                 }
  41
  42                 private static bool CanChangePrimitiveObjectToType(object source, Type type)
  43                 {
  44                         if (source == null)
  45                                 return true;
  46
  47                         if (source is Enum)
  48                                 return CanChangePrimitive (Enum.GetUnderlyingType (source.GetType ()), type);
  49                         else
  50                                 return CanChangePrimitive (source.GetType (), type);
  51                 }
  52         }
  53 }