2 // literal.cs: Literal representation for the IL tree.
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001 Ximian, Inc.
10 // Notice that during parsing we create objects of type Literal, but the
11 // types are not loaded (thats why the Resolve method has to assign the
12 // type at that point).
14 // Literals differ from the constants in that we know we encountered them
15 // as a literal in the source code (and some extra rules apply there) and
16 // they have to be resolved (since during parsing we have not loaded the
17 // types yet) while constants are created only after types have been loaded
18 // and are fully resolved when born.
22 using System.Reflection;
23 using System.Reflection.Emit;
26 // I put System.Null just so we do not have to special case it on
27 // TypeManager.CSharpName
31 // Represents the Null Type, just used as a placeholder for the type in NullLiteral
37 namespace Mono.CSharp {
40 // The NullType just exists to compare type equality, and for
41 // expressions that might have the `null type'
43 public class NullType {
47 // The null Literal constant
49 public class NullLiteral : Constant {
50 public static readonly NullLiteral Null;
54 Null = new NullLiteral ();
59 eclass = ExprClass.Value;
62 override public string AsString ()
67 public override object GetValue ()
72 public override Expression DoResolve (EmitContext ec)
74 type = TypeManager.null_type;
78 public override void Emit (EmitContext ec)
80 ec.ig.Emit (OpCodes.Ldnull);
83 public override bool IsDefaultValue {
89 public override bool IsNegative {
95 public override bool IsZeroInteger {
99 public override string GetSignatureForError()
107 // A null literal in a pointer context
109 public class NullPointer : NullLiteral {
110 public new static readonly NullLiteral Null;
112 static NullPointer ()
114 Null = new NullPointer ();
117 private NullPointer ()
119 type = TypeManager.object_type;
122 public override void Emit (EmitContext ec)
124 ILGenerator ig = ec.ig;
126 ig.Emit (OpCodes.Ldc_I4_0);
127 ig.Emit (OpCodes.Conv_U);
131 public class BoolLiteral : BoolConstant {
132 public BoolLiteral (bool val) : base (val)
136 public override Expression DoResolve (EmitContext ec)
138 type = TypeManager.bool_type;
143 public class CharLiteral : CharConstant {
144 public CharLiteral (char c) : base (c)
148 public override Expression DoResolve (EmitContext ec)
150 type = TypeManager.char_type;
155 public class IntLiteral : IntConstant {
156 public static IntLiteral One, Zero;
160 Zero = new IntLiteral (0);
161 One = new IntLiteral (1);
164 public IntLiteral (int l) : base (l)
168 public override Expression DoResolve (EmitContext ec)
170 type = TypeManager.int32_type;
175 public class UIntLiteral : UIntConstant {
176 public UIntLiteral (uint l) : base (l)
180 public override Expression DoResolve (EmitContext ec)
182 type = TypeManager.uint32_type;
187 public class LongLiteral : LongConstant {
188 public LongLiteral (long l) : base (l)
192 public override Expression DoResolve (EmitContext ec)
194 type = TypeManager.int64_type;
200 public class ULongLiteral : ULongConstant {
201 public ULongLiteral (ulong l) : base (l)
205 public override Expression DoResolve (EmitContext ec)
207 type = TypeManager.uint64_type;
212 public class FloatLiteral : FloatConstant {
214 public FloatLiteral (float f) : base (f)
218 public override Expression DoResolve (EmitContext ec)
220 type = TypeManager.float_type;
225 public class DoubleLiteral : DoubleConstant {
226 public DoubleLiteral (double d) : base (d)
230 public override Expression DoResolve (EmitContext ec)
232 type = TypeManager.double_type;
238 public class DecimalLiteral : DecimalConstant {
239 public DecimalLiteral (decimal d) : base (d)
243 public override Expression DoResolve (EmitContext ec)
245 type = TypeManager.decimal_type;
250 public class StringLiteral : StringConstant {
251 public StringLiteral (string s) : base (s)
255 public override Expression DoResolve (EmitContext ec)
257 type = TypeManager.string_type;