//
// Author:
// Miguel de Icaza (miguel@ximian.com)
+// Marek Safar (marek.safar@seznam.cz)
//
-// (C) 2001 Ximian, Inc.
+// Copyright 2001 Ximian, Inc.
//
//
// Notice that during parsing we create objects of type Literal, but the
// and are fully resolved when born.
//
-using System;
-using System.Reflection;
+#if STATIC
+using IKVM.Reflection.Emit;
+#else
using System.Reflection.Emit;
-
-//
-// I put System.Null just so we do not have to special case it on
-// TypeManager.CSharpName
-//
-namespace System {
- //
- // Represents the Null Type, just used as a placeholder for the type in NullLiteral
- //
- public class Null {
+#endif
+
+namespace Mono.CSharp
+{
+ public interface ILiteralConstant
+ {
+#if FULL_AST
+ char[] ParsedValue { get; set; }
+#endif
}
-}
-
-namespace Mono.CSharp {
//
- // The NullType just exists to compare type equality, and for
- // expressions that might have the `null type'
+ // The null literal
//
- public class NullType {
- }
-
+ // Note: C# specification null-literal is NullLiteral of NullType type
//
- // The null Literal constant
- //
- public class NullLiteral : Constant {
- public static readonly NullLiteral Null;
-
- static NullLiteral ()
+ public class NullLiteral : NullConstant
+ {
+ //
+ // Default type of null is an object
+ //
+ public NullLiteral (Location loc)
+ : base (InternalType.NullLiteral, loc)
{
- Null = new NullLiteral ();
}
-
- public NullLiteral ()
+
+ public override void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, TypeSpec t, bool expl)
{
- eclass = ExprClass.Value;
+ 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, loc, t, expl);
}
-
- override public string AsString ()
+
+ public override string GetValueAsLiteral ()
{
return "null";
}
- public override object GetValue ()
- {
- return null;
+ public override bool IsLiteral {
+ get { return true; }
}
- public override Expression DoResolve (EmitContext ec)
+ public override System.Linq.Expressions.Expression MakeExpression (BuilderContext ctx)
{
- type = TypeManager.null_type;
- return this;
+ return System.Linq.Expressions.Expression.Constant (null);
}
+ }
- public override void Emit (EmitContext ec)
+ public class BoolLiteral : BoolConstant, ILiteralConstant
+ {
+ public BoolLiteral (BuiltinTypes types, bool val, Location loc)
+ : base (types, val, loc)
{
- ec.ig.Emit (OpCodes.Ldnull);
}
- public override bool IsDefaultValue {
- get {
- return true;
- }
- }
-
- public override bool IsNegative {
- get {
- return false;
- }
- }
-
- public override bool IsZeroInteger {
+ public override bool IsLiteral {
get { return true; }
}
- }
- //
- // A null literal in a pointer context
- //
- public class NullPointer : NullLiteral {
- public new static readonly NullLiteral Null;
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
+ }
- static NullPointer ()
+ public class CharLiteral : CharConstant, ILiteralConstant
+ {
+ public CharLiteral (BuiltinTypes types, char c, Location loc)
+ : base (types, c, loc)
{
- Null = new NullPointer ();
}
- private NullPointer ()
- {
- type = TypeManager.object_type;
+ public override bool IsLiteral {
+ get { return true; }
}
- public override void Emit (EmitContext ec)
- {
- ILGenerator ig = ec.ig;
-
- ig.Emit (OpCodes.Ldc_I4_0);
- ig.Emit (OpCodes.Conv_U);
- }
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
- public class BoolLiteral : BoolConstant {
- public BoolLiteral (bool val) : base (val)
+ public class IntLiteral : IntConstant, ILiteralConstant
+ {
+ public IntLiteral (BuiltinTypes types, int l, Location loc)
+ : base (types, l, loc)
{
}
- public override Expression DoResolve (EmitContext ec)
+ public override Constant ConvertImplicitly (TypeSpec type)
{
- type = TypeManager.bool_type;
- return this;
- }
- }
+ //
+ // The 0 literal can be converted to an enum value
+ //
+ if (Value == 0 && TypeManager.IsEnumType (type)) {
+ Constant c = ConvertImplicitly (EnumSpec.GetUnderlyingType (type));
+ if (c == null)
+ return null;
+
+ return new EnumConstant (c, type);
+ }
- public class CharLiteral : CharConstant {
- public CharLiteral (char c) : base (c)
- {
+ return base.ConvertImplicitly (type);
}
- public override Expression DoResolve (EmitContext ec)
- {
- type = TypeManager.char_type;
- return this;
+ public override bool IsLiteral {
+ get { return true; }
}
+
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
- public class IntLiteral : IntConstant {
- public static IntLiteral One, Zero;
-
- static IntLiteral ()
- {
- Zero = new IntLiteral (0);
- One = new IntLiteral (1);
- }
-
- public IntLiteral (int l) : base (l)
+ public class UIntLiteral : UIntConstant, ILiteralConstant
+ {
+ public UIntLiteral (BuiltinTypes types, uint l, Location loc)
+ : base (types, l, loc)
{
}
- public override Expression DoResolve (EmitContext ec)
- {
- type = TypeManager.int32_type;
- return this;
+ public override bool IsLiteral {
+ get { return true; }
}
+
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
- public class UIntLiteral : UIntConstant {
- public UIntLiteral (uint l) : base (l)
+ public class LongLiteral : LongConstant, ILiteralConstant
+ {
+ public LongLiteral (BuiltinTypes types, long l, Location loc)
+ : base (types, l, loc)
{
}
- public override Expression DoResolve (EmitContext ec)
- {
- type = TypeManager.uint32_type;
- return this;
+ public override bool IsLiteral {
+ get { return true; }
}
+
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
-
- public class LongLiteral : LongConstant {
- public LongLiteral (long l) : base (l)
- {
- }
- public override Expression DoResolve (EmitContext ec)
+ public class ULongLiteral : ULongConstant, ILiteralConstant
+ {
+ public ULongLiteral (BuiltinTypes types, ulong l, Location loc)
+ : base (types, l, loc)
{
- type = TypeManager.int64_type;
+ }
- return this;
+ public override bool IsLiteral {
+ get { return true; }
}
+
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
- public class ULongLiteral : ULongConstant {
- public ULongLiteral (ulong l) : base (l)
+ public class FloatLiteral : FloatConstant, ILiteralConstant
+ {
+ public FloatLiteral (BuiltinTypes types, float f, Location loc)
+ : base (types, f, loc)
{
}
- public override Expression DoResolve (EmitContext ec)
- {
- type = TypeManager.uint64_type;
- return this;
+ public override bool IsLiteral {
+ get { return true; }
}
+
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
-
- public class FloatLiteral : FloatConstant {
-
- public FloatLiteral (float f) : base (f)
- {
- }
- public override Expression DoResolve (EmitContext ec)
+ public class DoubleLiteral : DoubleConstant, ILiteralConstant
+ {
+ public DoubleLiteral (BuiltinTypes types, double d, Location loc)
+ : base (types, d, loc)
{
- type = TypeManager.float_type;
- return this;
}
- }
- public class DoubleLiteral : DoubleConstant {
- public DoubleLiteral (double d) : base (d)
+ public override void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, 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, loc, target, expl);
}
- public override Expression DoResolve (EmitContext ec)
+ static void Error_664 (ResolveContext ec, Location loc, string type, string suffix)
{
- type = TypeManager.double_type;
+ 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);
+ }
- return this;
+ public override bool IsLiteral {
+ get { return true; }
}
+
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
- public class DecimalLiteral : DecimalConstant {
- public DecimalLiteral (decimal d) : base (d)
+ public class DecimalLiteral : DecimalConstant, ILiteralConstant
+ {
+ public DecimalLiteral (BuiltinTypes types, decimal d, Location loc)
+ : base (types, d, loc)
{
}
- public override Expression DoResolve (EmitContext ec)
- {
- type = TypeManager.decimal_type;
- return this;
+ public override bool IsLiteral {
+ get { return true; }
}
+
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
- public class StringLiteral : StringConstant {
- public StringLiteral (string s) : base (s)
+ public class StringLiteral : StringConstant, ILiteralConstant
+ {
+ public StringLiteral (BuiltinTypes types, string s, Location loc)
+ : base (types, s, loc)
{
}
- public override Expression DoResolve (EmitContext ec)
- {
- type = TypeManager.string_type;
-
- return this;
+ public override bool IsLiteral {
+ get { return true; }
}
+
+#if FULL_AST
+ char[] ILiteralConstant.ParsedValue { get; set; }
+#endif
}
}
projects / mono.git / blobdiff