2 // literal.cs: Literal representation for the IL tree.
5 // Miguel de Icaza (miguel@ximian.com)
6 // Marek Safar (marek.safar@seznam.cz)
8 // Copyright 2001 Ximian, Inc.
11 // Notice that during parsing we create objects of type Literal, but the
12 // types are not loaded (thats why the Resolve method has to assign the
13 // type at that point).
15 // Literals differ from the constants in that we know we encountered them
16 // as a literal in the source code (and some extra rules apply there) and
17 // they have to be resolved (since during parsing we have not loaded the
18 // types yet) while constants are created only after types have been loaded
19 // and are fully resolved when born.
23 using System.Reflection.Emit;
25 namespace Mono.CSharp {
30 // Note: C# specification null-literal is NullLiteral of NullType type
32 public class NullLiteral : NullConstant
35 // Default type of null is an object
37 public NullLiteral (Location loc)
38 : base (InternalType.Null, loc)
42 public override void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, TypeSpec t, bool expl)
44 if (t.IsGenericParameter) {
45 ec.Report.Error(403, loc,
46 "Cannot convert null to the type parameter `{0}' because it could be a value " +
47 "type. Consider using `default ({0})' instead", t.Name);
51 if (TypeManager.IsValueType (t)) {
52 ec.Report.Error(37, loc, "Cannot convert null to `{0}' because it is a value type",
53 TypeManager.CSharpName(t));
57 base.Error_ValueCannotBeConverted (ec, loc, t, expl);
60 public override bool IsLiteral {
64 public override System.Linq.Expressions.Expression MakeExpression (BuilderContext ctx)
66 return System.Linq.Expressions.Expression.Constant (null);
71 // A null literal in a pointer context
73 class NullPointer : NullLiteral {
74 public NullPointer (Location loc):
77 type = TypeManager.object_type;
80 public override void Emit (EmitContext ec)
85 ec.Emit (OpCodes.Ldc_I4_0);
86 ec.Emit (OpCodes.Conv_U);
90 public class BoolLiteral : BoolConstant {
91 public BoolLiteral (bool val, Location loc) : base (val, loc)
95 public override bool IsLiteral {
100 public class CharLiteral : CharConstant {
101 public CharLiteral (char c, Location loc) : base (c, loc)
105 public override bool IsLiteral {
110 public class IntLiteral : IntConstant {
111 public IntLiteral (int l, Location loc) : base (l, loc)
115 public override Constant ConvertImplicitly (ResolveContext rc, TypeSpec type)
118 // The 0 literal can be converted to an enum value
120 if (Value == 0 && TypeManager.IsEnumType (type)) {
121 Constant c = ConvertImplicitly (rc, EnumSpec.GetUnderlyingType (type));
125 return new EnumConstant (c, type).Resolve (rc);
128 return base.ConvertImplicitly (rc, type);
131 public override bool IsLiteral {
136 public class UIntLiteral : UIntConstant {
137 public UIntLiteral (uint l, Location loc) : base (l, loc)
141 public override bool IsLiteral {
146 public class LongLiteral : LongConstant {
147 public LongLiteral (long l, Location loc) : base (l, loc)
151 public override bool IsLiteral {
156 public class ULongLiteral : ULongConstant {
157 public ULongLiteral (ulong l, Location loc) : base (l, loc)
161 public override bool IsLiteral {
166 public class FloatLiteral : FloatConstant {
168 public FloatLiteral (float f, Location loc) : base (f, loc)
172 public override bool IsLiteral {
178 public class DoubleLiteral : DoubleConstant {
179 public DoubleLiteral (double d, Location loc) : base (d, loc)
183 public override void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, TypeSpec target, bool expl)
185 if (target == TypeManager.float_type) {
186 Error_664 (ec, loc, "float", "f");
190 if (target == TypeManager.decimal_type) {
191 Error_664 (ec, loc, "decimal", "m");
195 base.Error_ValueCannotBeConverted (ec, loc, target, expl);
198 static void Error_664 (ResolveContext ec, Location loc, string type, string suffix)
200 ec.Report.Error (664, loc,
201 "Literal of type double cannot be implicitly converted to type `{0}'. Add suffix `{1}' to create a literal of this type",
205 public override bool IsLiteral {
211 public class DecimalLiteral : DecimalConstant {
212 public DecimalLiteral (decimal d, Location loc) : base (d, loc)
216 public override bool IsLiteral {
221 public class StringLiteral : StringConstant {
222 public StringLiteral (string s, Location loc) : base (s, loc)
226 public override bool IsLiteral {