// Emit the load of a constant field. We can't emit a ldsfld/ldfld of a constant so we have to get its value
// and then emit a ldc.
private static void EmitLiteral(FieldInfo fi, FleeILGenerator ilg, IServiceProvider services)
{
object value = fi.GetValue(null);
Type t = value.GetType();
TypeCode code = Type.GetTypeCode(t);
LiteralElement elem = default(LiteralElement);
switch (code)
{
case TypeCode.Char:
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
elem = new Int32LiteralElement(System.Convert.ToInt32(value));
break;
case TypeCode.UInt32:
elem = new UInt32LiteralElement((UInt32)value);
break;
case TypeCode.Int64:
elem = new Int64LiteralElement((Int64)value);
break;
case TypeCode.UInt64:
elem = new UInt64LiteralElement((UInt64)value);
break;
case TypeCode.Double:
elem = new DoubleLiteralElement((double)value);
break;
case TypeCode.Single:
elem = new SingleLiteralElement((float)value);
break;
case TypeCode.Boolean:
elem = new BooleanLiteralElement((bool)value);
break;
case TypeCode.String:
elem = new StringLiteralElement((string)value);
break;
default:
elem = null;
Debug.Fail("Unsupported constant type");
break;
}
elem.Emit(ilg, services);
}
public static SingleLiteralElement Parse(string image, IServiceProvider services)
{
ExpressionParserOptions options = services.GetService(typeof(ExpressionParserOptions)) as ExpressionParserOptions;
SingleLiteralElement element = new SingleLiteralElement();
try
{
float value = options.ParseSingle(image);
return(new SingleLiteralElement(value));
}
catch (OverflowException)
{
element.OnParseOverflow(image);
return(null);
}
}
public override Node ExitReal(Token node)
{
LiteralElement element = default(LiteralElement);
string image = node.Image;
if (image.EndsWith("f", StringComparison.OrdinalIgnoreCase) == true)
{
image = image.Remove(image.Length - 1);
element = SingleLiteralElement.Parse(image, MyServices);
}
else
{
element = DoubleLiteralElement.Parse(image, MyServices);
}
node.AddValue(element);
return(node);
}
