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 {
101 // A null literal in a pointer context
103 public class NullPointer : NullLiteral {
104 public new static readonly NullLiteral Null;
106 static NullPointer ()
108 Null = new NullPointer ();
111 private NullPointer ()
113 type = TypeManager.object_type;
116 public override void Emit (EmitContext ec)
118 ILGenerator ig = ec.ig;
120 ig.Emit (OpCodes.Ldc_I4_0);
121 ig.Emit (OpCodes.Conv_U);
125 public class BoolLiteral : BoolConstant {
126 public BoolLiteral (bool val) : base (val)
130 public override Expression DoResolve (EmitContext ec)
132 type = TypeManager.bool_type;
137 public class CharLiteral : CharConstant {
138 public CharLiteral (char c) : base (c)
142 public override Expression DoResolve (EmitContext ec)
144 type = TypeManager.char_type;
149 public class IntLiteral : IntConstant {
150 public static IntLiteral One, Zero;
154 Zero = new IntLiteral (0);
155 One = new IntLiteral (1);
158 public IntLiteral (int l) : base (l)
162 public override Expression DoResolve (EmitContext ec)
164 type = TypeManager.int32_type;
169 public class UIntLiteral : UIntConstant {
170 public UIntLiteral (uint l) : base (l)
174 public override Expression DoResolve (EmitContext ec)
176 type = TypeManager.uint32_type;
181 public class LongLiteral : LongConstant {
182 public LongLiteral (long l) : base (l)
186 public override Expression DoResolve (EmitContext ec)
188 type = TypeManager.int64_type;
194 public class ULongLiteral : ULongConstant {
195 public ULongLiteral (ulong l) : base (l)
199 public override Expression DoResolve (EmitContext ec)
201 type = TypeManager.uint64_type;
206 public class FloatLiteral : FloatConstant {
208 public FloatLiteral (float f) : base (f)
212 public override Expression DoResolve (EmitContext ec)
214 type = TypeManager.float_type;
219 public class DoubleLiteral : DoubleConstant {
220 public DoubleLiteral (double d) : base (d)
224 public override Expression DoResolve (EmitContext ec)
226 type = TypeManager.double_type;
232 public class DecimalLiteral : DecimalConstant {
233 public DecimalLiteral (decimal d) : base (d)
237 public override Expression DoResolve (EmitContext ec)
239 type = TypeManager.decimal_type;
244 public class StringLiteral : StringConstant {
245 public StringLiteral (string s) : base (s)
249 public override Expression DoResolve (EmitContext ec)
251 type = TypeManager.string_type;