//
-// constant.cs: Constant expressions and constant folding.
+// constant.cs: Constants.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
namespace Mono.CSharp {
using System;
- using System.Reflection;
using System.Reflection.Emit;
- using System.Collections;
+ /// <summary>
+ /// Base class for constants and literals.
+ /// </summary>
+ public abstract class Constant : Expression {
- public class Constant : Expression {
-
- public readonly string Name;
- public readonly string ConstantType;
- public Expression Expr;
- public Attributes OptAttributes;
-
- int mod_flags;
- Location Location;
- public FieldBuilder FieldBuilder;
-
- public const int AllowedModifiers =
- Modifiers.NEW |
- Modifiers.PUBLIC |
- Modifiers.PROTECTED |
- Modifiers.INTERNAL |
- Modifiers.PRIVATE;
-
- public Constant (string constant_type, string name, Expression expr, int mod_flags,
- Attributes attrs, Location loc)
- {
- this.ConstantType = constant_type;
- this.Name = name;
- this.Expr = expr;
- this.mod_flags = Modifiers.Check (AllowedModifiers, mod_flags, Modifiers.PRIVATE);
- this.Location = loc;
- OptAttributes = attrs;
- }
-
- public FieldAttributes FieldAttr {
- get {
- return FieldAttributes.Literal | FieldAttributes.Static |
- Modifiers.FieldAttr (mod_flags) ;
- }
+ protected Constant ()
+ {
+ eclass = ExprClass.Value;
}
- public int ModFlags {
- get {
- return mod_flags;
- }
+ /// <remarks>
+ /// This is different from ToString in that ToString
+ /// is supposed to be there for debugging purposes,
+ /// and is not guaranteed to be useful for anything else,
+ /// AsString() will provide something that can be used
+ /// for round-tripping C# code. Maybe it can be used
+ /// for IL assembly as well.
+ /// </remarks>
+ public abstract string AsString ();
+
+ override public string ToString ()
+ {
+ return AsString ();
}
+ /// <summary>
+ /// This is used to obtain the actual value of the literal
+ /// cast into an object.
+ /// </summary>
+ public abstract object GetValue ();
+
+ /// <summary>
+ /// Constants are always born in a fully resolved state
+ /// </summary>
public override Expression DoResolve (EmitContext ec)
{
- // FIXME: implement
return this;
}
+ }
+ public class BoolConstant : Constant {
+ public readonly bool Value;
+
+ public BoolConstant (bool val)
+ {
+ type = TypeManager.bool_type;
+
+ Value = val;
+ }
+
+ override public string AsString ()
+ {
+ return Value ? "true" : "false";
+ }
+
+ public override object GetValue ()
+ {
+ return (object) Value;
+ }
+
+
public override void Emit (EmitContext ec)
{
- throw new Exception ("Unimplemented");
+ if (Value)
+ ec.ig.Emit (OpCodes.Ldc_I4_1);
+ else
+ ec.ig.Emit (OpCodes.Ldc_I4_0);
}
-
- /// <summary>
- /// Defines the constant in the @parent
- /// </summary>
- public void Define (TypeContainer parent)
+ }
+
+ public class ByteConstant : Constant {
+ public readonly byte Value;
+
+ public ByteConstant (byte v)
{
- type = parent.LookupType (ConstantType, true);
+ type = TypeManager.byte_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class CharConstant : Constant {
+ public readonly char Value;
+
+ public CharConstant (char v)
+ {
+ type = TypeManager.char_type;
+ Value = v;
+ }
- if (type == null)
- return;
-
- if (!TypeManager.IsBuiltinType (type) && (!type.IsSubclassOf (TypeManager.enum_type))) {
- Report.Error (-3, "Constant type is not valid (only system types are allowed)");
- return;
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ static public string descape (char c)
+ {
+ switch (c){
+ case '\a':
+ return "\\a";
+ case '\b':
+ return "\\b";
+ case '\n':
+ return "\\n";
+ case '\t':
+ return "\\t";
+ case '\v':
+ return "\\v";
+ case '\r':
+ return "\\r";
+ case '\\':
+ return "\\\\";
+ case '\f':
+ return "\\f";
+ case '\0':
+ return "\\0";
+ case '"':
+ return "\\\"";
+ case '\'':
+ return "\\\'";
}
-
- FieldBuilder = parent.TypeBuilder.DefineField (Name, type, FieldAttr);
+ return c.ToString ();
}
- /// <summary>
- /// Emits the field value by evaluating the expression
- /// </summary>
- public void EmitConstant (TypeContainer parent)
+ public override string AsString ()
{
- if (FieldBuilder == null)
- return;
-
- EmitContext ec = new EmitContext (parent, Location, null, type, ModFlags);
+ return "\"" + descape (Value) + "\"";
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
- Expr = Expression.Reduce (ec, Expr);
+ public class SByteConstant : Constant {
+ public readonly sbyte Value;
- if (!(Expr is Literal)) {
- Report.Error (150, Location, "A constant value is expected");
- return;
+ public SByteConstant (sbyte v)
+ {
+ type = TypeManager.sbyte_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class ShortConstant : Constant {
+ public readonly short Value;
+
+ public ShortConstant (short v)
+ {
+ type = TypeManager.short_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class UShortConstant : Constant {
+ public readonly ushort Value;
+
+ public UShortConstant (ushort v)
+ {
+ type = TypeManager.ushort_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class IntConstant : Constant {
+ public readonly int Value;
+
+ public IntConstant (int v)
+ {
+ type = TypeManager.int32_type;
+ Value = v;
+ }
+
+ static public void EmitInt (ILGenerator ig, int i)
+ {
+ switch (i){
+ case -1:
+ ig.Emit (OpCodes.Ldc_I4_M1);
+ break;
+
+ case 0:
+ ig.Emit (OpCodes.Ldc_I4_0);
+ break;
+
+ case 1:
+ ig.Emit (OpCodes.Ldc_I4_1);
+ break;
+
+ case 2:
+ ig.Emit (OpCodes.Ldc_I4_2);
+ break;
+
+ case 3:
+ ig.Emit (OpCodes.Ldc_I4_3);
+ break;
+
+ case 4:
+ ig.Emit (OpCodes.Ldc_I4_4);
+ break;
+
+ case 5:
+ ig.Emit (OpCodes.Ldc_I4_5);
+ break;
+
+ case 6:
+ ig.Emit (OpCodes.Ldc_I4_6);
+ break;
+
+ case 7:
+ ig.Emit (OpCodes.Ldc_I4_7);
+ break;
+
+ case 8:
+ ig.Emit (OpCodes.Ldc_I4_8);
+ break;
+
+ default:
+ if (i >= -128 && i <= 127){
+ ig.Emit (OpCodes.Ldc_I4_S, (sbyte) i);
+ } else
+ ig.Emit (OpCodes.Ldc_I4, i);
+ break;
}
+ }
- object val = ((Literal) Expr).GetValue ();
+ public override void Emit (EmitContext ec)
+ {
+ EmitInt (ec.ig, Value);
+ }
- FieldBuilder.SetConstant (val);
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
- TypeManager.RegisterField (FieldBuilder, val);
-
- return;
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class UIntConstant : Constant {
+ public readonly uint Value;
+
+ public UIntConstant (uint v)
+ {
+ type = TypeManager.uint32_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, unchecked ((int) Value));
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class LongConstant : Constant {
+ public readonly long Value;
+
+ public LongConstant (long v)
+ {
+ type = TypeManager.int64_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ EmitLong (ig, Value);
+ }
+
+ static public void EmitLong (ILGenerator ig, long l)
+ {
+ ig.Emit (OpCodes.Ldc_I8, l);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class ULongConstant : Constant {
+ public readonly ulong Value;
+
+ public ULongConstant (ulong v)
+ {
+ type = TypeManager.uint64_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ LongLiteral.EmitLong (ig, unchecked ((long) Value));
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class FloatConstant : Constant {
+ public readonly float Value;
+
+ public FloatConstant (float v)
+ {
+ type = TypeManager.float_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldc_R4, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class DoubleConstant : Constant {
+ public readonly double Value;
+
+ public DoubleConstant (double v)
+ {
+ type = TypeManager.double_type;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldc_R8, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+ }
+
+ public class DecimalConstant : Constant {
+ public readonly decimal Value;
+
+ public DecimalConstant (decimal d)
+ {
+ type = TypeManager.decimal_type;
+ Value = d;
+ }
+
+ override public string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return (object) Value;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Implement me");
+ }
+ }
+
+ public class StringConstant : Constant {
+ public readonly string Value;
+
+ public StringConstant (string s)
+ {
+ type = TypeManager.string_type;
+ Value = s;
+ }
+
+ // FIXME: Escape the string.
+ override public string AsString ()
+ {
+ return "\"" + Value + "\"";
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldstr, Value);
}
}
+
}
projects / mono.git / blobdiff