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;
25 namespace Mono.CSharp {
27 public class NullLiteral : Constant {
28 public static readonly NullLiteral Null;
32 Null = new NullLiteral ();
37 eclass = ExprClass.Value;
40 override public string AsString ()
45 public override object GetValue ()
50 public override Expression DoResolve (EmitContext ec)
52 type = TypeManager.object_type;
56 public override void Emit (EmitContext ec)
58 ec.ig.Emit (OpCodes.Ldnull);
63 // A null literal in a pointer context
65 public class NullPointer : NullLiteral {
66 public new static readonly NullLiteral Null;
70 Null = new NullPointer ();
73 public override void Emit (EmitContext ec)
75 ILGenerator ig = ec.ig;
77 ig.Emit (OpCodes.Ldc_I4_0);
78 ig.Emit (OpCodes.Conv_U);
82 public class BoolLiteral : BoolConstant {
83 public BoolLiteral (bool val) : base (val)
87 public override Expression DoResolve (EmitContext ec)
89 type = TypeManager.bool_type;
94 public class CharLiteral : CharConstant {
95 public CharLiteral (char c) : base (c)
99 public override Expression DoResolve (EmitContext ec)
101 type = TypeManager.char_type;
106 public class IntLiteral : IntConstant {
107 public static IntLiteral One, Zero;
111 Zero = new IntLiteral (0);
112 One = new IntLiteral (1);
115 public IntLiteral (int l) : base (l)
119 public override Expression DoResolve (EmitContext ec)
121 type = TypeManager.int32_type;
126 public class UIntLiteral : UIntConstant {
127 public UIntLiteral (uint l) : base (l)
131 public override Expression DoResolve (EmitContext ec)
133 type = TypeManager.uint32_type;
138 public class LongLiteral : LongConstant {
139 public LongLiteral (long l) : base (l)
143 public override Expression DoResolve (EmitContext ec)
145 type = TypeManager.int64_type;
151 public class ULongLiteral : ULongConstant {
152 public ULongLiteral (ulong l) : base (l)
156 public override Expression DoResolve (EmitContext ec)
158 type = TypeManager.uint64_type;
163 public class FloatLiteral : FloatConstant {
165 public FloatLiteral (float f) : base (f)
169 public override Expression DoResolve (EmitContext ec)
171 type = TypeManager.float_type;
176 public class DoubleLiteral : DoubleConstant {
177 public DoubleLiteral (double d) : base (d)
181 public override Expression DoResolve (EmitContext ec)
183 type = TypeManager.double_type;
189 public class DecimalLiteral : DecimalConstant {
190 public DecimalLiteral (decimal d) : base (d)
194 public override Expression DoResolve (EmitContext ec)
196 type = TypeManager.decimal_type;
201 public class StringLiteral : StringConstant {
202 public StringLiteral (string s) : base (s)
206 public override Expression DoResolve (EmitContext ec)
208 type = TypeManager.string_type;