// 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);
}
// Attempt to find the first type of integer that a number can fit into
public static LiteralElement Create(string image, bool isHex, bool negated, IServiceProvider services)
{
StringComparison comparison = StringComparison.OrdinalIgnoreCase;
ExpressionOptions options = services.GetService(typeof(ExpressionOptions)) as ExpressionOptions;
// Convert to a double if option is set
if (options.IntegersAsDoubles == true)
{
return(DoubleLiteralElement.Parse(image, services));
}
bool hasUSuffix = image.EndsWith("u", comparison) & !image.EndsWith("lu", comparison);
bool hasLSuffix = image.EndsWith("l", comparison) & !image.EndsWith("ul", comparison);
bool hasULSuffix = image.EndsWith("ul", comparison) | image.EndsWith("lu", comparison);
bool hasSuffix = hasUSuffix | hasLSuffix | hasULSuffix;
LiteralElement constant = default(LiteralElement);
NumberStyles numStyles = NumberStyles.Integer;
if (isHex == true)
{
numStyles = NumberStyles.AllowHexSpecifier;
image = image.Remove(0, 2);
}
if (hasSuffix == false)
{
// If the literal has no suffix, it has the first of these types in which its value can be represented: int, uint, long, ulong.
constant = Int32LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
constant = UInt32LiteralElement.TryCreate(image, numStyles);
if ((constant != null))
{
return(constant);
}
constant = Int64LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
return(new UInt64LiteralElement(image, numStyles));
}
else if (hasUSuffix == true)
{
image = image.Remove(image.Length - 1);
// If the literal is suffixed by U or u, it has the first of these types in which its value can be represented: uint, ulong.
constant = UInt32LiteralElement.TryCreate(image, numStyles);
if ((constant != null))
{
return(constant);
}
else
{
return(new UInt64LiteralElement(image, numStyles));
}
}
else if (hasLSuffix == true)
{
// If the literal is suffixed by L or l, it has the first of these types in which its value can be represented: long, ulong.
image = image.Remove(image.Length - 1);
constant = Int64LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
else
{
return(new UInt64LiteralElement(image, numStyles));
}
}
else
{
// If the literal is suffixed by UL, Ul, uL, ul, LU, Lu, lU, or lu, it is of type ulong.
Debug.Assert(hasULSuffix == true, "expecting ul suffix");
image = image.Remove(image.Length - 2);
return(new UInt64LiteralElement(image, numStyles));
}
}