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//
// literal.cs: Literal representation for the IL tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Marek Safar (marek.safar@seznam.cz)
//
// Copyright 2001 Ximian, Inc.
// Copyright 2011 Xamarin Inc
//
//
// Notice that during parsing we create objects of type Literal, but the
// types are not loaded (thats why the Resolve method has to assign the
// type at that point).
//
// Literals differ from the constants in that we know we encountered them
// as a literal in the source code (and some extra rules apply there) and
// they have to be resolved (since during parsing we have not loaded the
// types yet) while constants are created only after types have been loaded
// and are fully resolved when born.
//
#if STATIC
using IKVM.Reflection.Emit;
#else
using System.Reflection.Emit;
#endif
namespace Mono.CSharp
{
public interface ILiteralConstant
{
#if FULL_AST
char[] ParsedValue { get; set; }
#endif
}
//
// The null literal
//
// Note: C# specification null-literal is NullLiteral of NullType type
//
public class NullLiteral : NullConstant
{
//
// Default type of null is an object
//
public NullLiteral (Location loc)
: base (InternalType.NullLiteral, loc)
{
}
public override void Error_ValueCannotBeConverted (ResolveContext ec, TypeSpec t, bool expl)
{
if (t.IsGenericParameter) {
ec.Report.Error(403, loc,
"Cannot convert null to the type parameter `{0}' because it could be a value " +
"type. Consider using `default ({0})' instead", t.Name);
return;
}
if (TypeSpec.IsValueType (t)) {
ec.Report.Error(37, loc, "Cannot convert null to `{0}' because it is a value type",
TypeManager.CSharpName(t));
return;
}
base.Error_ValueCannotBeConverted (ec, t, expl);
}
public override string GetValueAsLiteral ()
{
return "null";
}
public override bool IsLiteral {
get { return true; }
}
public override System.Linq.Expressions.Expression MakeExpression (BuilderContext ctx)
{
return System.Linq.Expressions.Expression.Constant (null);
}
}
public class BoolLiteral : BoolConstant, ILiteralConstant
{
public BoolLiteral (BuiltinTypes types, bool val, Location loc)
: base (types, val, loc)
{
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class CharLiteral : CharConstant, ILiteralConstant
{
public CharLiteral (BuiltinTypes types, char c, Location loc)
: base (types, c, loc)
{
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class IntLiteral : IntConstant, ILiteralConstant
{
public IntLiteral (BuiltinTypes types, int l, Location loc)
: base (types, l, loc)
{
}
public override Constant ConvertImplicitly (TypeSpec type)
{
//
// The 0 literal can be converted to an enum value
//
if (Value == 0 && type.IsEnum) {
Constant c = ConvertImplicitly (EnumSpec.GetUnderlyingType (type));
if (c == null)
return null;
return new EnumConstant (c, type);
}
return base.ConvertImplicitly (type);
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class UIntLiteral : UIntConstant, ILiteralConstant
{
public UIntLiteral (BuiltinTypes types, uint l, Location loc)
: base (types, l, loc)
{
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class LongLiteral : LongConstant, ILiteralConstant
{
public LongLiteral (BuiltinTypes types, long l, Location loc)
: base (types, l, loc)
{
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class ULongLiteral : ULongConstant, ILiteralConstant
{
public ULongLiteral (BuiltinTypes types, ulong l, Location loc)
: base (types, l, loc)
{
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class FloatLiteral : FloatConstant, ILiteralConstant
{
public FloatLiteral (BuiltinTypes types, float f, Location loc)
: base (types, f, loc)
{
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class DoubleLiteral : DoubleConstant, ILiteralConstant
{
public DoubleLiteral (BuiltinTypes types, double d, Location loc)
: base (types, d, loc)
{
}
public override void Error_ValueCannotBeConverted (ResolveContext ec, TypeSpec target, bool expl)
{
if (target.BuiltinType == BuiltinTypeSpec.Type.Float) {
Error_664 (ec, loc, "float", "f");
return;
}
if (target.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
Error_664 (ec, loc, "decimal", "m");
return;
}
base.Error_ValueCannotBeConverted (ec, target, expl);
}
static void Error_664 (ResolveContext ec, Location loc, string type, string suffix)
{
ec.Report.Error (664, loc,
"Literal of type double cannot be implicitly converted to type `{0}'. Add suffix `{1}' to create a literal of this type",
type, suffix);
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class DecimalLiteral : DecimalConstant, ILiteralConstant
{
public DecimalLiteral (BuiltinTypes types, decimal d, Location loc)
: base (types, d, loc)
{
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public class StringLiteral : StringConstant, ILiteralConstant
{
public StringLiteral (BuiltinTypes types, string s, Location loc)
: base (types, s, loc)
{
}
public override bool IsLiteral {
get { return true; }
}
#if FULL_AST
public char[] ParsedValue { get; set; }
#endif
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
}
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