X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=mcs%2Fmcs%2Fconstant.cs;h=4030080a0b273504b59c05e496bd60cad8b91fb6;hb=e7690bd882ef9b0b077a0d15f4a7ec7d71ecfc70;hp=0085a756c6df16487583e85ebec8ac79e0cebbfa;hpb=21f1862187bf3a120f55dfe98f81b10e6eb29c72;p=mono.git

diff --git a/mcs/mcs/constant.cs b/mcs/mcs/constant.cs
index 0085a756c6d..4030080a0b2 100755
--- a/mcs/mcs/constant.cs
+++ b/mcs/mcs/constant.cs
@@ -1,5 +1,5 @@
 //
-// constant.cs: Constant expressions and constant folding.
+// constant.cs: Constants.
 //
 // Author:
 //   Miguel de Icaza (miguel@ximian.com)
@@ -11,110 +11,964 @@
 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 {
+		/// <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 ();
 
-	public class Constant : Expression {
+		override public string ToString ()
+		{
+			return this.GetType ().Name + " (" + 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)
+		{
+			return this;
+		}
+
+		//
+		// The various ToXXXX conversion functions are used by the constant
+		// folding evaluator.   A null value is returned if the conversion is
+		// not possible.   
+		//
+		// Note: not all the patterns for catching `implicit_conv' are the same.
+		// some implicit conversions can never be performed between two types
+		// even if the conversion would be lossless (for example short to uint),
+		// but some conversions are explicitly permitted by the standard provided
+		// that there will be no loss of information (for example, int to uint).
+		//
+		public DoubleConstant ToDouble (Location loc)
+		{
+			DoubleConstant c = ConvertToDouble ();
+
+			if (c == null)
+				Error_CannotConvertImplicit (loc, Type, TypeManager.double_type);
+
+			return c;
+		}
+
+		public FloatConstant ToFloat (Location loc)
+		{
+			FloatConstant c = ConvertToFloat ();
+
+			if (c == null)
+				Error_CannotConvertImplicit (loc, Type, TypeManager.float_type);
+
+			return c;
+		}
+
+		public ULongConstant ToULong (Location loc)
+		{
+			ULongConstant c = ConvertToULong ();
+
+			if (c == null)
+				Error_CannotConvertImplicit (loc, Type, TypeManager.uint64_type);
+
+			return c;
+		}
+
+		public LongConstant ToLong (Location loc)
+		{
+			LongConstant c = ConvertToLong ();
+
+			if (c == null)
+				Error_CannotConvertImplicit (loc, Type, TypeManager.int64_type);
+
+			return c;
+		}
+		
+		public UIntConstant ToUInt (Location loc)
+		{
+			UIntConstant c = ConvertToUInt ();
+
+			if (c == null)
+				Error_CannotConvertImplicit (loc, Type, TypeManager.uint32_type);
+
+			return c;
+		}
+
+		public IntConstant ToInt (Location loc)
+		{
+			IntConstant c = ConvertToInt ();
+
+			if (c == null)
+				Error_CannotConvertImplicit (loc, Type, TypeManager.int32_type);
+
+			return c;
+		}
+		
+		public virtual DoubleConstant ConvertToDouble ()
+		{
+			return null;
+		}
+
+		public virtual FloatConstant ConvertToFloat ()
+		{
+			return null;
+		}
+
+		public virtual ULongConstant ConvertToULong ()
+		{
+			return null;
+		}
+
+		public virtual LongConstant ConvertToLong ()
+		{
+			return null;
+		}
+
+		public virtual UIntConstant ConvertToUInt ()
+		{
+			return null;
+		}
+
+		public virtual IntConstant ConvertToInt ()
+		{
+			return null;
+		}
+	}
+	
+	public class BoolConstant : Constant {
+		public readonly bool Value;
+		
+		public BoolConstant (bool val)
+		{
+			type = TypeManager.bool_type;
+			eclass = ExprClass.Value;
 
-		public readonly string     Name;
-		public Expression Expr;
-		public readonly string     ConstantType;
-		public Attributes  OptAttributes;
+			Value = val;
+		}
+
+		override public string AsString ()
+		{
+			return Value ? "true" : "false";
+		}
+
+		public override object GetValue ()
+		{
+			return (object) Value;
+		}
+				
 		
-		int        mod_flags;
+		public override void Emit (EmitContext ec)
+		{
+			if (Value)
+				ec.ig.Emit (OpCodes.Ldc_I4_1);
+			else
+				ec.ig.Emit (OpCodes.Ldc_I4_0);
+		}
+	}
 
-		Location Location;
-		FieldBuilder FieldBuilder;
+	public class ByteConstant : Constant {
+		public readonly byte Value;
 
-		public const int AllowedModifiers =
-			Modifiers.NEW |
-			Modifiers.PUBLIC |
-			Modifiers.PROTECTED |
-			Modifiers.INTERNAL |
-			Modifiers.PRIVATE;
+		public ByteConstant (byte v)
+		{
+			type = TypeManager.byte_type;
+			eclass = ExprClass.Value;
+			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 override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
 
-		public Constant (string constant_type, string name, Expression expr, int mod_flags,
-				 Attributes attrs, Location loc)
+		public override FloatConstant ConvertToFloat ()
 		{
-			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;
+			return new FloatConstant (Value);
 		}
 
-		public FieldAttributes FieldAttr {
-			get {
-				return FieldAttributes.Literal | FieldAttributes.Static |
-					Modifiers.FieldAttr (mod_flags) ;
+		public override ULongConstant ConvertToULong ()
+		{
+			return new ULongConstant (Value);
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return new LongConstant (Value);
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return new UIntConstant (Value);
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return new IntConstant (Value);
+		}
+	}
+
+	public class CharConstant : Constant {
+		public readonly char Value;
+
+		public CharConstant (char v)
+		{
+			type = TypeManager.char_type;
+			eclass = ExprClass.Value;
+			Value = v;
+		}
+
+		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 "\\\'"; 
 			}
+			return c.ToString ();
+		}
+
+		public override string AsString ()
+		{
+			return "\"" + descape (Value) + "\"";
+		}
+
+		public override object GetValue ()
+		{
+			return Value;
+		}
+
+		public override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return new FloatConstant (Value);
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			return new ULongConstant (Value);
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return new LongConstant (Value);
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return new UIntConstant (Value);
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return new IntConstant (Value);
+		}
+	}
+
+	public class SByteConstant : Constant {
+		public readonly sbyte Value;
+
+		public SByteConstant (sbyte v)
+		{
+			type = TypeManager.sbyte_type;
+			eclass = ExprClass.Value;
+			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 override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return new FloatConstant (Value);
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			if (Value >= 0)
+				return new ULongConstant ((ulong) Value);
+			
+			return null;
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return new LongConstant (Value);
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return null;
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return new IntConstant (Value);
+		}
+	}
+
+	public class ShortConstant : Constant {
+		public readonly short Value;
+
+		public ShortConstant (short v)
+		{
+			type = TypeManager.short_type;
+			eclass = ExprClass.Value;
+			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 override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return new FloatConstant (Value);
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			return null;
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return new LongConstant (Value);
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return null;
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return new IntConstant (Value);
+		}
+	}
+
+	public class UShortConstant : Constant {
+		public readonly ushort Value;
+
+		public UShortConstant (ushort v)
+		{
+			type = TypeManager.ushort_type;
+			eclass = ExprClass.Value;
+			Value = v;
 		}
 
-		public int ModFlags {
-			get {
-				return mod_flags;
+		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 override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return new FloatConstant (Value);
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			return new ULongConstant (Value);
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return new LongConstant (Value);
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return new UIntConstant (Value);
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return new IntConstant (Value);
+		}
+	}
+
+	public class IntConstant : Constant {
+		public readonly int Value;
+
+		public IntConstant (int v)
+		{
+			type = TypeManager.int32_type;
+			eclass = ExprClass.Value;
+			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;
 			}
 		}
 
-		public override Expression DoResolve (EmitContext ec)
+		public override void Emit (EmitContext ec)
+		{
+			EmitInt (ec.ig, Value);
+		}
+
+		public override string AsString ()
+		{
+			return Value.ToString ();
+		}
+
+		public override object GetValue ()
+		{
+			return Value;
+		}
+
+		public override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return new FloatConstant (Value);
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			if (Value < 0)
+				return null;
+
+			return new ULongConstant ((ulong) Value);
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return new LongConstant (Value);
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			if (Value < 0)
+				return null;
+
+			return new UIntConstant ((uint) Value);
+		}
+
+		public override IntConstant ConvertToInt ()
 		{
-			// FIXME: implement
 			return this;
 		}
+	}
+
+	public class UIntConstant : Constant {
+		public readonly uint Value;
+
+		public UIntConstant (uint v)
+		{
+			type = TypeManager.uint32_type;
+			eclass = ExprClass.Value;
+			Value = v;
+		}
 
 		public override void Emit (EmitContext ec)
 		{
-			throw new Exception ("Unimplemented");
+			IntLiteral.EmitInt (ec.ig, unchecked ((int) Value));
 		}
-		       
-		/// <summary>
-		///   Defines the constant in the @parent
-		/// </summary>
-		public void Define (TypeContainer parent)
+
+		public override string AsString ()
 		{
-			type = parent.LookupType (ConstantType, true);
+			return Value.ToString ();
+		}
 
-			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 object GetValue ()
+		{
+			return Value;
+		}
+
+		public override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return new FloatConstant (Value);
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			return new ULongConstant (Value);
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return new LongConstant (Value);
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return this;
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return null;
+		}
+	}
+
+	public class LongConstant : Constant {
+		public readonly long Value;
+
+		public LongConstant (long v)
+		{
+			type = TypeManager.int64_type;
+			eclass = ExprClass.Value;
+			Value = v;
+		}
+
+		public override void Emit (EmitContext ec)
+		{
+			ILGenerator ig = ec.ig;
+
+			EmitLong (ig, Value);
+		}
+
+		static public void EmitLong (ILGenerator ig, long l)
+		{
+			if ((l >> 32) == 0){
+				IntLiteral.EmitInt (ig, unchecked ((int) l));
+				ig.Emit (OpCodes.Conv_U8);
+			} else {
+				ig.Emit (OpCodes.Ldc_I8, l);
 			}
-			
-			FieldBuilder = parent.TypeBuilder.DefineField (Name, type, FieldAttr);
-			
 		}
 
-		/// <summary>
-		///  Emits the field value by evaluating the expression
-		/// </summary>
-		public void EmitConstant (TypeContainer parent)
+		public override string AsString ()
 		{
-			if (FieldBuilder == null)
-				return;
+			return Value.ToString ();
+		}
+
+		public override object GetValue ()
+		{
+			return Value;
+		}
+
+		public override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return new FloatConstant (Value);
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			if (Value < 0)
+				return null;
 			
-			EmitContext ec = new EmitContext (parent, null, type, ModFlags);
+			return new ULongConstant ((ulong) Value);
+		}
 
-			Expr = Expression.Reduce (ec, Expr);
+		public override LongConstant ConvertToLong ()
+		{
+			return this;
+		}
 
-			if (!(Expr is Literal)) {
-				Report.Error (150, Location, "A constant value is expected");
-				return;
-			}
+		public override UIntConstant ConvertToUInt ()
+		{
+			return null;
+		}
 
-			object val = ((Literal) Expr).GetValue ();
+		public override IntConstant ConvertToInt ()
+		{
+			return null;
+		}
+	}
 
-			FieldBuilder.SetConstant (val);
+	public class ULongConstant : Constant {
+		public readonly ulong Value;
 
-			TypeManager.RegisterField (FieldBuilder, val);
+		public ULongConstant (ulong v)
+		{
+			type = TypeManager.uint64_type;
+			eclass = ExprClass.Value;
+			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 override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return new FloatConstant (Value);
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			return this;
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return null;
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return null;
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return null;
+		}
+	}
+
+	public class FloatConstant : Constant {
+		public readonly float Value;
+
+		public FloatConstant (float v)
+		{
+			type = TypeManager.float_type;
+			eclass = ExprClass.Value;
+			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 override DoubleConstant ConvertToDouble ()
+		{
+			return new DoubleConstant (Value);
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return this;
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return null;
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return null;
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return null;
+		}
+	}
+
+	public class DoubleConstant : Constant {
+		public readonly double Value;
+
+		public DoubleConstant (double v)
+		{
+			type = TypeManager.double_type;
+			eclass = ExprClass.Value;
+			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 override DoubleConstant ConvertToDouble ()
+		{
+			return this;
+		}
+
+		public override FloatConstant ConvertToFloat ()
+		{
+			return null;
+		}
+
+		public override ULongConstant ConvertToULong ()
+		{
+			return null;
+		}
+
+		public override LongConstant ConvertToLong ()
+		{
+			return null;
+		}
+
+		public override UIntConstant ConvertToUInt ()
+		{
+			return null;
+		}
+
+		public override IntConstant ConvertToInt ()
+		{
+			return null;
+		}
+	}
+
+	public class DecimalConstant : Constant {
+		public readonly decimal Value;
+
+		public DecimalConstant (decimal d)
+		{
+			type = TypeManager.decimal_type;
+			eclass = ExprClass.Value;
+			Value = d;
+		}
+
+		override public string AsString ()
+		{
+			return Value.ToString ();
+		}
+
+		public override object GetValue ()
+		{
+			return (object) Value;
+		}
+
+		public override void Emit (EmitContext ec)
+		{
+			int [] words = Decimal.GetBits (Value);
 			
-			return;
+			//
+			// FIXME: we could optimize this, and call a better 
+			// constructor
+			//
+
+			ILGenerator ig = ec.ig;
+			
+			IntConstant.EmitInt (ig, words [0]);
+			IntConstant.EmitInt (ig, words [1]);
+			IntConstant.EmitInt (ig, words [2]);
+
+			// sign
+			IntConstant.EmitInt (ig, words [3] >> 31);
+
+			// power
+			IntConstant.EmitInt (ig, (words [3] >> 16) & 0xff);
+
+			ig.Emit (OpCodes.Newobj, TypeManager.void_decimal_ctor_five_args);
 		}
 	}
+
+	public class StringConstant : Constant {
+		public readonly string Value;
+
+		public StringConstant (string s)
+		{
+			type = TypeManager.string_type;
+			eclass = ExprClass.Value;
+			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);
+		}
+	}
+
 }