mcs/gmcs/enum.cs

   1 //
   2 // enum.cs: Enum handling.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Ravi Pratap     (ravi@ximian.com)
   6 //         Marek Safar     (marek.safar@seznam.cz)
   7 //
   8 // Licensed under the terms of the GNU GPL
   9 //
  10 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  11 //
  12
  13 using System;
  14 using System.Collections;
  15 using System.Collections.Specialized;
  16 using System.Reflection;
  17 using System.Reflection.Emit;
  18 using System.Globalization;
  19
  20 namespace Mono.CSharp {
  21
  22         public class EnumMember : MemberCore, IConstant {
  23                 static string[] attribute_targets = new string [] { "field" };
  24
  25                 public FieldBuilder builder;
  26
  27                 readonly Enum parent_enum;
  28                 readonly Expression ValueExpr;
  29                 readonly EnumMember prev_member;
  30
  31                 Constant value;
  32                 bool in_transit;
  33
  34                 // TODO: remove or simplify
  35                 EmitContext ec;
  36
  37                 public EnumMember (Enum parent_enum, EnumMember prev_member, Expression expr,
  38                                 MemberName name, Attributes attrs):
  39                         base (parent_enum, name, attrs)
  40                 {
  41                         this.parent_enum = parent_enum;
  42                         this.ModFlags = parent_enum.ModFlags;
  43                         this.ValueExpr = expr;
  44                         this.prev_member = prev_member;
  45
  46                         ec = new EmitContext (parent_enum, parent_enum, Location, null, null, ModFlags, false);
  47                         ec.InEnumContext = true;
  48                 }
  49
  50                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
  51                 {
  52                         if (a.Type == TypeManager.marshal_as_attr_type) {
  53                                 UnmanagedMarshal marshal = a.GetMarshal (this);
  54                                 if (marshal != null) {
  55                                         builder.SetMarshal (marshal);
  56                                 }
  57                                 return;
  58                         }
  59
  60                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type)) {
  61                                 a.Error_InvalidSecurityParent ();
  62                                 return;
  63                         }
  64
  65                         builder.SetCustomAttribute (cb);
  66                 }
  67
  68                 public override AttributeTargets AttributeTargets {
  69                         get {
  70                                 return AttributeTargets.Field;
  71                         }
  72                 }
  73
  74                 bool IsValidEnumType (Type t)
  75                 {
  76                         return (t == TypeManager.int32_type || t == TypeManager.uint32_type || t == TypeManager.int64_type ||
  77                                 t == TypeManager.byte_type || t == TypeManager.sbyte_type || t == TypeManager.short_type ||
  78                                 t == TypeManager.ushort_type || t == TypeManager.uint64_type || t == TypeManager.char_type ||
  79                                 t.IsEnum);
  80                 }
  81
  82                 public override bool Define ()
  83                 {
  84                         const FieldAttributes attr = FieldAttributes.Public | FieldAttributes.Static | FieldAttributes.Literal;
  85                         TypeBuilder tb = parent_enum.TypeBuilder;
  86                         builder = tb.DefineField (Name, tb, attr);
  87                         ec.ContainerType = tb;
  88
  89                         TypeManager.RegisterConstant (builder, this);
  90                         return true;
  91                 }
  92
  93                 // Because parent is TypeContainer and we have DeclSpace only
  94                 public override void CheckObsoleteness (Location loc)
  95                 {
  96                         parent_enum.CheckObsoleteness (loc);
  97
  98                         ObsoleteAttribute oa = GetObsoleteAttribute ();
  99                         if (oa == null) {
 100                                 return;
 101                         }
 102
 103                         AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
 104                 }
 105
 106                 public bool ResolveValue ()
 107                 {
 108                         if (value != null)
 109                                 return true;
 110
 111                         if (in_transit) {
 112                                 // suppress cyclic errors
 113                                 value = new EnumConstant (New.Constantify (parent_enum.UnderlyingType), parent_enum.TypeBuilder);
 114                                 Const.Error_CyclicDeclaration (this);
 115                                 return false;
 116                         }
 117
 118                         if (ValueExpr != null) {
 119                                 in_transit = true;
 120                                 Constant c = ValueExpr.ResolveAsConstant (ec, this);
 121                                 in_transit = false;
 122
 123                                 if (c == null)
 124                                         return false;
 125
 126                                 if (c is EnumConstant)
 127                                         c = ((EnumConstant)c).Child;
 128
 129                                 c = c.ToType (parent_enum.UnderlyingType, Location);
 130                                 if (c == null)
 131                                         return false;
 132
 133                                 if (!IsValidEnumType (c.Type)) {
 134                                         Report.Error (1008, Location, "Type byte, sbyte, short, ushort, int, uint, long or ulong expected");
 135                                         return false;
 136                                 }
 137
 138                                 in_transit = false;
 139                                 value = new EnumConstant (c, parent_enum.TypeBuilder);
 140                                 return true;
 141                         }
 142
 143                         if (prev_member == null) {
 144                                 value = new EnumConstant (New.Constantify (parent_enum.UnderlyingType), parent_enum.TypeBuilder);
 145                                 return true;
 146                         }
 147
 148                         if (!prev_member.ResolveValue ())
 149                                 return false;
 150
 151                         in_transit = true;
 152
 153                         try {
 154                                 value = prev_member.value.Increment ();
 155                         }
 156                         catch (OverflowException) {
 157                                 Report.Error (543, Location, "The enumerator value `{0}' is too large to fit in its type `{1}'",
 158                                         GetSignatureForError (), TypeManager.CSharpName (parent_enum.UnderlyingType));
 159                                 return false;
 160                         }
 161                         in_transit = false;
 162
 163                         return true;
 164                 }
 165
 166                 public override void Emit ()
 167                 {
 168                         if (OptAttributes != null)
 169                                 OptAttributes.Emit ();
 170
 171                         if (!ResolveValue ())
 172                                 return;
 173
 174                         builder.SetConstant (value.GetValue ());
 175                         base.Emit ();
 176                 }
 177
 178                 public override string GetSignatureForError()
 179                 {
 180                         return String.Concat (parent_enum.GetSignatureForError (), '.', Name);
 181                 }
 182
 183                 public override string[] ValidAttributeTargets {
 184                         get {
 185                                 return attribute_targets;
 186                         }
 187                 }
 188
 189                 protected override bool VerifyClsCompliance(DeclSpace ds)
 190                 {
 191                         // Because parent is TypeContainer and we have only DeclSpace parent.
 192                         // Parameter replacing is required
 193                         return base.VerifyClsCompliance (parent_enum);
 194                 }
 195
 196                 public override string DocCommentHeader {
 197                         get { return "F:"; }
 198                 }
 199
 200                 #region IConstant Members
 201
 202                 public Constant Value {
 203                         get {
 204                                 return value;
 205                         }
 206                 }
 207
 208                 #endregion
 209         }
 210
 211         /// <summary>
 212         ///   Enumeration container
 213         /// </summary>
 214         public class Enum : DeclSpace {
 215                 Expression BaseType;
 216                 public Type UnderlyingType;
 217
 218                 static MemberList no_list = new MemberList (new object[0]);
 219
 220                 public const int AllowedModifiers =
 221                         Modifiers.NEW |
 222                         Modifiers.PUBLIC |
 223                         Modifiers.PROTECTED |
 224                         Modifiers.INTERNAL |
 225                         Modifiers.PRIVATE;
 226
 227                 public Enum (NamespaceEntry ns, TypeContainer parent, Expression type,
 228                              int mod_flags, MemberName name, Attributes attrs)
 229                         : base (ns, parent, name, attrs)
 230                 {
 231                         this.BaseType = type;
 232                         ModFlags = Modifiers.Check (AllowedModifiers, mod_flags,
 233                                                     IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE, name.Location);
 234                 }
 235
 236                 public void AddEnumMember (EnumMember em)
 237                 {
 238                         if (em.Name == "value__") {
 239                                 Report.Error (76, em.Location, "An item in an enumeration cannot have an identifier `value__'");
 240                                 return;
 241                         }
 242
 243                         if (!AddToContainer (em, em.Name))
 244                                 return;
 245                 }
 246
 247                 public override TypeBuilder DefineType ()
 248                 {
 249                         if (TypeBuilder != null)
 250                                 return TypeBuilder;
 251
 252                         if (!(BaseType is TypeLookupExpression)) {
 253                                 Report.Error (1008, Location,
 254                                         "Type byte, sbyte, short, ushort, int, uint, long or ulong expected");
 255                                 return null;
 256                         }
 257
 258                         TypeExpr ute = ResolveBaseTypeExpr (BaseType, false, Location);
 259                         if (ute == null)
 260                                 return null;
 261
 262                         UnderlyingType = ute.Type;
 263
 264                         if (UnderlyingType != TypeManager.int32_type &&
 265                             UnderlyingType != TypeManager.uint32_type &&
 266                             UnderlyingType != TypeManager.int64_type &&
 267                             UnderlyingType != TypeManager.uint64_type &&
 268                             UnderlyingType != TypeManager.short_type &&
 269                             UnderlyingType != TypeManager.ushort_type &&
 270                             UnderlyingType != TypeManager.byte_type  &&
 271                             UnderlyingType != TypeManager.sbyte_type) {
 272                                 Report.Error (1008, Location,
 273                                         "Type byte, sbyte, short, ushort, int, uint, long or ulong expected");
 274                                 return null;
 275                         }
 276
 277                         if (IsTopLevel) {
 278                                 if (TypeManager.NamespaceClash (Name, Location))
 279                                         return null;
 280
 281                                 ModuleBuilder builder = CodeGen.Module.Builder;
 282
 283                                 TypeBuilder = builder.DefineType (Name, TypeAttr, TypeManager.enum_type);
 284                         } else {
 285                                 TypeBuilder builder = Parent.TypeBuilder;
 286
 287                                 TypeBuilder = builder.DefineNestedType (
 288                                         Basename, TypeAttr, TypeManager.enum_type);
 289                         }
 290
 291                         //
 292                         // Call MapToInternalType for corlib
 293                         //
 294                         TypeBuilder.DefineField ("value__", UnderlyingType,
 295                                                  FieldAttributes.Public | FieldAttributes.SpecialName
 296                                                  | FieldAttributes.RTSpecialName);
 297
 298                         TypeManager.AddUserType (this);
 299
 300                         foreach (EnumMember em in defined_names.Values) {
 301                                 if (!em.Define ())
 302                                         return null;
 303                         }
 304
 305                         return TypeBuilder;
 306                 }
 307
 308                 public override bool Define ()
 309                 {
 310                         return true;
 311                 }
 312
 313                 public override void Emit ()
 314                 {
 315                         if (OptAttributes != null) {
 316                                 OptAttributes.Emit ();
 317                         }
 318
 319                         foreach (EnumMember em in defined_names.Values) {
 320                                 em.Emit ();
 321                         }
 322
 323                         base.Emit ();
 324                 }
 325
 326                 //
 327                 // IMemberFinder
 328                 //
 329                 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 330                         MemberFilter filter, object criteria)
 331                 {
 332                         if ((mt & MemberTypes.Field) == 0)
 333                                 return no_list;
 334
 335                         EnumMember em = defined_names [criteria] as EnumMember;
 336                         if (em == null)
 337                                 return no_list;
 338
 339                         FieldBuilder[] fb = new FieldBuilder[] { em.builder };
 340                         return new MemberList (fb);
 341                 }
 342
 343                 void VerifyClsName ()
 344                 {
 345                         HybridDictionary dict = new HybridDictionary (defined_names.Count, true);
 346                         foreach (EnumMember em in defined_names.Values) {
 347                                 if (!em.IsClsComplianceRequired ())
 348                                         continue;
 349
 350                                 try {
 351                                         dict.Add (em.Name, em);
 352                                 }
 353                                 catch (ArgumentException) {
 354                                         Report.SymbolRelatedToPreviousError (em);
 355                                         MemberCore col = (MemberCore)dict [em.Name];
 356                                         Report.Warning (3005, 1, col.Location, "Identifier `{0}' differing only in case is not CLS-compliant", col.GetSignatureForError ());
 357                                 }
 358                         }
 359                 }
 360
 361                 protected override bool VerifyClsCompliance (DeclSpace ds)
 362                 {
 363                         if (!base.VerifyClsCompliance (ds))
 364                                 return false;
 365
 366                         VerifyClsName ();
 367
 368                         if (UnderlyingType == TypeManager.uint32_type ||
 369                                 UnderlyingType == TypeManager.uint64_type ||
 370                                 UnderlyingType == TypeManager.ushort_type) {
 371                                 Report.Error (3009, Location, "`{0}': base type `{1}' is not CLS-compliant", GetSignatureForError (), TypeManager.CSharpName (UnderlyingType));
 372                         }
 373
 374                         return true;
 375                 }
 376
 377
 378                 public override MemberCache MemberCache {
 379                         get {
 380                                 return null;
 381                         }
 382                 }
 383
 384                 public override AttributeTargets AttributeTargets {
 385                         get {
 386                                 return AttributeTargets.Enum;
 387                         }
 388                 }
 389
 390                 protected override TypeAttributes TypeAttr {
 391                         get {
 392                                 return Modifiers.TypeAttr (ModFlags, IsTopLevel) |
 393                                 TypeAttributes.Class | TypeAttributes.Sealed |
 394                                 base.TypeAttr;
 395                         }
 396                 }
 397
 398                 //
 399                 // Generates xml doc comments (if any), and if required,
 400                 // handle warning report.
 401                 //
 402                 internal override void GenerateDocComment (DeclSpace ds)
 403                 {
 404                         base.GenerateDocComment (ds);
 405
 406                         foreach (EnumMember em in defined_names.Values) {
 407                                 em.GenerateDocComment (this);
 408                         }
 409                 }
 410
 411                 //
 412                 //   Represents header string for documentation comment.
 413                 //
 414                 public override string DocCommentHeader {
 415                         get { return "T:"; }
 416                 }
 417         }
 418 }