private static void ConvertFromBoolean(ILGenerator il, OpCode conversionOpCode)
{
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Ceq);
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Ceq);
if (conversionOpCode == OpCodes.Call)
{
il.Emit(OpCodes.Call, DecimalMetadata.GetConversionMethodToDecimal(TypeCode.Int32));
}
else
{
il.Emit(conversionOpCode);
}
}
public static void EmitConversion(ILGenerator il, Type from, Type to)
{
if (from.IsClass == false && ReferenceEquals(to, typeof(object)))
{
il.Emit(OpCodes.Box, from);
return;
}
var fromTypeCode = Type.GetTypeCode(from);
var toTypeCode = Type.GetTypeCode(to);
var conversionOpCode = ConversionOpCodeTable[(int)toTypeCode, (int)fromTypeCode];
if (conversionOpCode == OpCodes.Nop)
{
return;
}
if (conversionOpCode == OpCodes.Throw)
{
// Guid cannot be resolved from ConversionOpCodeTable.
if (ReferenceEquals(from, typeof(Guid)) && ReferenceEquals(to, typeof(Guid)))
{
return;
}
// byte[] cannot be resolved from ConversionOpCodeTable.
if (ReferenceEquals(from, typeof(object)) && ReferenceEquals(to, typeof(byte[])))
{
return;
}
// char[] cannot be resolved from ConversionOpCodeTable.
if (ReferenceEquals(from, typeof(object)) && ReferenceEquals(to, typeof(char[])))
{
return;
}
il.Emit(OpCodes.Ldstr, ThrowException.InvalidCast(from, to));
il.Emit(OpCodes.Newobj, typeof(InvalidCastException).GetConstructor(Type.EmptyTypes));
il.Emit(OpCodes.Throw);
}
if (fromTypeCode == TypeCode.Boolean)
{
ConvertFromBoolean(il, conversionOpCode);
return;
}
if (toTypeCode == TypeCode.Boolean)
{
ConvertToBoolean(il, conversionOpCode);
return;
}
if (fromTypeCode == TypeCode.Decimal)
{
il.Emit(OpCodes.Call, DecimalMetadata.GetConversionMethodFromDecimal(toTypeCode));
return;
}
if (toTypeCode == TypeCode.Decimal)
{
il.Emit(OpCodes.Call, DecimalMetadata.GetConversionMethodToDecimal(fromTypeCode));
return;
}
if ((fromTypeCode == TypeCode.UInt32 || fromTypeCode == TypeCode.UInt64) && (toTypeCode == TypeCode.Single || toTypeCode == TypeCode.Double))
{
il.Emit(OpCodes.Conv_R_Un);
}
il.Emit(conversionOpCode);
}