mcs/mcs/attribute.cs

   1 //
   2 // attribute.cs: Attribute Handler
   3 //
   4 // Author: Ravi Pratap (ravi@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
  10 // Copyright 2003-2008 Novell, Inc.
  11 //
  12
  13 using System;
  14 using System.Diagnostics;
  15 using System.Collections;
  16 using System.Collections.Specialized;
  17 using System.Reflection;
  18 using System.Reflection.Emit;
  19 using System.Runtime.InteropServices;
  20 using System.Runtime.CompilerServices;
  21 using System.Security;
  22 using System.Security.Permissions;
  23 using System.Text;
  24 using System.IO;
  25
  26 namespace Mono.CSharp {
  27
  28         /// <summary>
  29         ///   Base class for objects that can have Attributes applied to them.
  30         /// </summary>
  31         public abstract class Attributable {
  32                 /// <summary>
  33                 ///   Attributes for this type
  34                 /// </summary>
  35                 protected Attributes attributes;
  36
  37                 public Attributable (Attributes attrs)
  38                 {
  39                         if (attrs != null)
  40                                 OptAttributes = attrs;
  41                 }
  42
  43                 public Attributes OptAttributes
  44                 {
  45                         get {
  46                                 return attributes;
  47                         }
  48                         set {
  49                                 attributes = value;
  50
  51                                 if (attributes != null) {
  52                                         attributes.AttachTo (this);
  53                                 }
  54                         }
  55                 }
  56
  57                 /// <summary>
  58                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  59                 /// </summary>
  60                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb);
  61
  62                 /// <summary>
  63                 /// Returns one AttributeTarget for this element.
  64                 /// </summary>
  65                 public abstract AttributeTargets AttributeTargets { get; }
  66
  67                 public abstract IResolveContext ResolveContext { get; }
  68
  69                 public abstract bool IsClsComplianceRequired ();
  70
  71                 /// <summary>
  72                 /// Gets list of valid attribute targets for explicit target declaration.
  73                 /// The first array item is default target. Don't break this rule.
  74                 /// </summary>
  75                 public abstract string[] ValidAttributeTargets { get; }
  76         };
  77
  78         public class Attribute : Expression
  79         {
  80                 //
  81                 // Wraps owner resolve context, the owner is an attribute
  82                 // parent and the rest is exactly same
  83                 //
  84                 struct AttributeResolveContext : IResolveContext
  85                 {
  86                         readonly IResolveContext rc;
  87
  88                         public AttributeResolveContext (IResolveContext rc)
  89                         {
  90                                 this.rc = rc;
  91                         }
  92
  93                         #region IResolveContext Members
  94
  95                         public DeclSpace DeclContainer {
  96                                 get {
  97                                         DeclSpace ds = rc as DeclSpace;
  98                                         if (ds == null)
  99                                                 return rc.DeclContainer;
 100
 101                                         return ds;
 102                                 }
 103                         }
 104
 105                         public bool IsInObsoleteScope {
 106                                 get { return rc.IsInObsoleteScope; }
 107                         }
 108
 109                         public bool IsInUnsafeScope {
 110                                 get { return rc.IsInUnsafeScope; }
 111                         }
 112
 113                         public DeclSpace GenericDeclContainer {
 114                                 get { return rc.GenericDeclContainer; }
 115                         }
 116
 117                         #endregion
 118                 }
 119
 120                 public readonly string ExplicitTarget;
 121                 public AttributeTargets Target;
 122
 123                 // TODO: remove this member
 124                 public readonly string    Name;
 125                 public readonly Expression LeftExpr;
 126                 public readonly string Identifier;
 127
 128                 ArrayList PosArguments;
 129                 ArrayList NamedArguments;
 130
 131                 bool resolve_error;
 132                 readonly bool nameEscaped;
 133
 134                 // It can contain more onwers when the attribute is applied to multiple fiels.
 135                 protected Attributable[] owners;
 136
 137                 static readonly AttributeUsageAttribute DefaultUsageAttribute = new AttributeUsageAttribute (AttributeTargets.All);
 138                 static Assembly orig_sec_assembly;
 139                 public static readonly object[] EmptyObject = new object [0];
 140
 141                 // non-null if named args present after Resolve () is called
 142                 PropertyInfo [] prop_info_arr;
 143                 FieldInfo [] field_info_arr;
 144                 object [] field_values_arr;
 145                 object [] prop_values_arr;
 146                 object [] pos_values;
 147
 148                 static PtrHashtable usage_attr_cache;
 149                 // Cache for parameter-less attributes
 150                 static PtrHashtable att_cache;
 151
 152                 public Attribute (string target, Expression left_expr, string identifier, object[] args, Location loc, bool nameEscaped)
 153                 {
 154                         LeftExpr = left_expr;
 155                         Identifier = identifier;
 156                         Name = LeftExpr == null ? identifier : LeftExpr + "." + identifier;
 157                         if (args != null) {
 158                                 PosArguments = (ArrayList)args [0];
 159                                 NamedArguments = (ArrayList)args [1];
 160                         }
 161                         this.loc = loc;
 162                         ExplicitTarget = target;
 163                         this.nameEscaped = nameEscaped;
 164                 }
 165
 166                 public Attribute Clone ()
 167                 {
 168                         Attribute a = new Attribute (ExplicitTarget, LeftExpr, Identifier, null, loc, nameEscaped);
 169                         a.PosArguments = PosArguments;
 170                         a.NamedArguments = NamedArguments;
 171                         return a;
 172                 }
 173
 174                 static Attribute ()
 175                 {
 176                         Reset ();
 177                 }
 178
 179                 public static void Reset ()
 180                 {
 181                         usage_attr_cache = new PtrHashtable ();
 182                         att_cache = new PtrHashtable ();
 183                 }
 184
 185                 public virtual void AttachTo (Attributable owner)
 186                 {
 187                         if (this.owners == null) {
 188                                 this.owners = new Attributable[1] { owner };
 189                                 return;
 190                         }
 191
 192                         // When the same attribute is attached to multiple fiels
 193                         // we use this extra_owners as a list of owners. The attribute
 194                         // then can be removed because will be emitted when first owner
 195                         // is served
 196                         Attributable[] new_array = new Attributable [this.owners.Length + 1];
 197                         owners.CopyTo (new_array, 0);
 198                         new_array [owners.Length] = owner;
 199                         this.owners = new_array;
 200                         owner.OptAttributes = null;
 201                 }
 202
 203                 void Error_InvalidNamedArgument (string name)
 204                 {
 205                         Report.Error (617, Location, "`{0}' is not a valid named attribute argument. Named attribute arguments " +
 206                                       "must be fields which are not readonly, static, const or read-write properties which are " +
 207                                       "public and not static",
 208                               name);
 209                 }
 210
 211                 void Error_InvalidNamedAgrumentType (string name)
 212                 {
 213                         Report.Error (655, Location, "`{0}' is not a valid named attribute argument because it is not a valid " +
 214                                       "attribute parameter type", name);
 215                 }
 216
 217                 public static void Error_AttributeArgumentNotValid (Location loc)
 218                 {
 219                         Report.Error (182, loc,
 220                                       "An attribute argument must be a constant expression, typeof " +
 221                                       "expression or array creation expression");
 222                 }
 223
 224                 static void Error_TypeParameterInAttribute (Location loc)
 225                 {
 226                         Report.Error (
 227                                 -202, loc, "Can not use a type parameter in an attribute");
 228                 }
 229
 230                 public void Error_MissingGuidAttribute ()
 231                 {
 232                         Report.Error (596, Location, "The Guid attribute must be specified with the ComImport attribute");
 233                 }
 234
 235                 public void Error_MisusedExtensionAttribute ()
 236                 {
 237                         Report.Error (1112, Location, "Do not use `{0}' directly. Use parameter modifier `this' instead", GetSignatureForError ());
 238                 }
 239
 240                 /// <summary>
 241                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 242                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 243                 /// </summary>
 244                 public void Error_AttributeEmitError (string inner)
 245                 {
 246                         Report.Error (647, Location, "Error during emitting `{0}' attribute. The reason is `{1}'",
 247                                       TypeManager.CSharpName (Type), inner);
 248                 }
 249
 250                 public void Error_InvalidSecurityParent ()
 251                 {
 252                         Error_AttributeEmitError ("it is attached to invalid parent");
 253                 }
 254
 255                 Attributable Owner {
 256                         get {
 257                                 return owners [0];
 258                         }
 259                 }
 260
 261                 protected virtual TypeExpr ResolveAsTypeTerminal (Expression expr, IResolveContext ec, bool silent)
 262                 {
 263                         return expr.ResolveAsTypeTerminal (ec, silent);
 264                 }
 265
 266                 Type ResolvePossibleAttributeType (string name, bool silent, ref bool is_attr)
 267                 {
 268                         IResolveContext rc = new AttributeResolveContext (Owner.ResolveContext);
 269
 270                         TypeExpr te;
 271                         if (LeftExpr == null) {
 272                                 te = ResolveAsTypeTerminal (new SimpleName (name, Location), rc, silent);
 273                         } else {
 274                                 te = ResolveAsTypeTerminal (new MemberAccess (LeftExpr, name), rc, silent);
 275                         }
 276
 277                         if (te == null)
 278                                 return null;
 279
 280                         Type t = te.Type;
 281                         if (TypeManager.IsSubclassOf (t, TypeManager.attribute_type)) {
 282                                 is_attr = true;
 283                         } else if (!silent) {
 284                                 Report.SymbolRelatedToPreviousError (t);
 285                                 Report.Error (616, Location, "`{0}': is not an attribute class", TypeManager.CSharpName (t));
 286                         }
 287                         return t;
 288                 }
 289
 290                 /// <summary>
 291                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 292                 /// </summary>
 293                 void ResolveAttributeType ()
 294                 {
 295                         bool t1_is_attr = false;
 296                         Type t1 = ResolvePossibleAttributeType (Identifier, true, ref t1_is_attr);
 297
 298                         bool t2_is_attr = false;
 299                         Type t2 = nameEscaped ? null :
 300                                 ResolvePossibleAttributeType (Identifier + "Attribute", true, ref t2_is_attr);
 301
 302                         if (t1_is_attr && t2_is_attr) {
 303                                 Report.Error (1614, Location, "`{0}' is ambiguous between `{0}' and `{0}Attribute'. " +
 304                                               "Use either `@{0}' or `{0}Attribute'", GetSignatureForError ());
 305                                 resolve_error = true;
 306                                 return;
 307                         }
 308
 309                         if (t1_is_attr) {
 310                                 Type = t1;
 311                                 return;
 312                         }
 313
 314                         if (t2_is_attr) {
 315                                 Type = t2;
 316                                 return;
 317                         }
 318
 319                         if (t1 == null && t2 == null)
 320                                 ResolvePossibleAttributeType (Identifier, false, ref t1_is_attr);
 321                         if (t1 != null)
 322                                 ResolvePossibleAttributeType (Identifier, false, ref t1_is_attr);
 323                         if (t2 != null)
 324                                 ResolvePossibleAttributeType (Identifier + "Attribute", false, ref t2_is_attr);
 325
 326                         resolve_error = true;
 327                 }
 328
 329                 public virtual Type ResolveType ()
 330                 {
 331                         if (Type == null && !resolve_error)
 332                                 ResolveAttributeType ();
 333                         return Type;
 334                 }
 335
 336                 public override string GetSignatureForError ()
 337                 {
 338                         if (Type != null)
 339                                 return TypeManager.CSharpName (Type);
 340
 341                         return LeftExpr == null ? Identifier : LeftExpr.GetSignatureForError () + "." + Identifier;
 342                 }
 343
 344                 public bool HasSecurityAttribute {
 345                         get {
 346                                 return TypeManager.security_attr_type != null &&
 347                                 TypeManager.IsSubclassOf (type, TypeManager.security_attr_type);
 348                         }
 349                 }
 350
 351                 public bool IsValidSecurityAttribute ()
 352                 {
 353                         return HasSecurityAttribute && IsSecurityActionValid (false);
 354                 }
 355
 356                 static bool IsValidArgumentType (Type t)
 357                 {
 358                         if (t.IsArray)
 359                                 t = TypeManager.GetElementType (t);
 360
 361                         return t == TypeManager.string_type ||
 362                                 TypeManager.IsPrimitiveType (t) ||
 363                                 TypeManager.IsEnumType (t) ||
 364                                 t == TypeManager.object_type ||
 365                                 t == TypeManager.type_type;
 366                 }
 367
 368                 [Conditional ("GMCS_SOURCE")]
 369                 void ApplyModuleCharSet ()
 370                 {
 371                         if (Type != TypeManager.dllimport_type)
 372                                 return;
 373
 374                         if (!CodeGen.Module.HasDefaultCharSet)
 375                                 return;
 376
 377                         const string CharSetEnumMember = "CharSet";
 378                         if (NamedArguments == null) {
 379                                 NamedArguments = new ArrayList (1);
 380                         } else {
 381                                 foreach (DictionaryEntry de in NamedArguments) {
 382                                         if ((string)de.Key == CharSetEnumMember)
 383                                                 return;
 384                                 }
 385                         }
 386
 387                         NamedArguments.Add (new DictionaryEntry (CharSetEnumMember,
 388                                 new Argument (Constant.CreateConstant (typeof (CharSet), CodeGen.Module.DefaultCharSet, Location))));
 389                 }
 390
 391                 public CustomAttributeBuilder Resolve ()
 392                 {
 393                         if (resolve_error)
 394                                 return null;
 395
 396                         resolve_error = true;
 397
 398                         if (Type == null) {
 399                                 ResolveAttributeType ();
 400                                 if (Type == null)
 401                                         return null;
 402                         }
 403
 404                         if (Type.IsAbstract) {
 405                                 Report.Error (653, Location, "Cannot apply attribute class `{0}' because it is abstract", GetSignatureForError ());
 406                                 return null;
 407                         }
 408
 409                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (Type);
 410                         if (obsolete_attr != null) {
 411                                 AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (Type), Location);
 412                         }
 413
 414                         if (PosArguments == null && NamedArguments == null) {
 415                                 object o = att_cache [Type];
 416                                 if (o != null) {
 417                                         resolve_error = false;
 418                                         return (CustomAttributeBuilder)o;
 419                                 }
 420                         }
 421
 422                         Attributable owner = Owner;
 423                         DeclSpace ds = owner.ResolveContext as DeclSpace;
 424                         if (ds == null)
 425                                 ds = owner.ResolveContext.DeclContainer;
 426
 427                         EmitContext ec = new EmitContext (owner.ResolveContext, ds, ds,
 428                                 Location, null, typeof (Attribute), ds.ModFlags, false);
 429                         ec.IsAnonymousMethodAllowed = false;
 430
 431                         ConstructorInfo ctor = ResolveConstructor (ec);
 432                         if (ctor == null) {
 433                                 if (Type is TypeBuilder &&
 434                                     TypeManager.LookupDeclSpace (Type).MemberCache == null)
 435                                         // The attribute type has been DefineType'd, but not Defined.  Let's not treat it as an error.
 436                                         // It'll be resolved again when the attached-to entity is emitted.
 437                                         resolve_error = false;
 438                                 return null;
 439                         }
 440
 441                         ApplyModuleCharSet ();
 442
 443                         CustomAttributeBuilder cb;
 444                         try {
 445                                 // SRE does not allow private ctor but we want to report all source code errors
 446                                 if (ctor.IsPrivate)
 447                                         return null;
 448
 449                                 if (NamedArguments == null) {
 450                                         cb = new CustomAttributeBuilder (ctor, pos_values);
 451
 452                                         if (pos_values.Length == 0)
 453                                                 att_cache.Add (Type, cb);
 454
 455                                         resolve_error = false;
 456                                         return cb;
 457                                 }
 458
 459                                 if (!ResolveNamedArguments (ec)) {
 460                                         return null;
 461                                 }
 462
 463                                 cb = new CustomAttributeBuilder (ctor, pos_values,
 464                                                 prop_info_arr, prop_values_arr,
 465                                                 field_info_arr, field_values_arr);
 466
 467                                 resolve_error = false;
 468                                 return cb;
 469                         }
 470                         catch (Exception) {
 471                                 Error_AttributeArgumentNotValid (Location);
 472                                 return null;
 473                         }
 474                 }
 475
 476                 protected virtual ConstructorInfo ResolveConstructor (EmitContext ec)
 477                 {
 478                         if (PosArguments != null) {
 479                                 for (int i = 0; i < PosArguments.Count; i++) {
 480                                         Argument a = (Argument) PosArguments [i];
 481
 482                                         if (!a.Resolve (ec, Location))
 483                                                 return null;
 484                                 }
 485                         }
 486
 487                         MethodGroupExpr mg = MemberLookupFinal (ec, ec.ContainerType,
 488                                 Type, ".ctor", MemberTypes.Constructor,
 489                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 490                                 Location) as MethodGroupExpr;
 491
 492                         if (mg == null)
 493                                 return null;
 494
 495                         mg = mg.OverloadResolve (ec, ref PosArguments, false, Location);
 496                         if (mg == null)
 497                                 return null;
 498
 499                         ConstructorInfo constructor = (ConstructorInfo)mg;
 500                         if (PosArguments == null) {
 501                                 pos_values = EmptyObject;
 502                                 return constructor;
 503                         }
 504
 505                         AParametersCollection pd = TypeManager.GetParameterData (constructor);
 506
 507                         int pos_arg_count = PosArguments.Count;
 508                         pos_values = new object [pos_arg_count];
 509                         for (int j = 0; j < pos_arg_count; ++j) {
 510                                 Argument a = (Argument) PosArguments [j];
 511
 512                                 if (!a.Expr.GetAttributableValue (ec, a.Type, out pos_values [j]))
 513                                         return null;
 514                         }
 515
 516                         // Here we do the checks which should be done by corlib or by runtime.
 517                         // However Zoltan doesn't like it and every Mono compiler has to do it again.
 518
 519                         if (Type == TypeManager.guid_attr_type) {
 520                                 try {
 521                                         new Guid ((string)pos_values [0]);
 522                                 }
 523                                 catch (Exception e) {
 524                                         Error_AttributeEmitError (e.Message);
 525                                         return null;
 526                                 }
 527                         }
 528
 529                         if (Type == TypeManager.attribute_usage_type && (int)pos_values [0] == 0) {
 530                                 Report.Error (591, Location, "Invalid value for argument to `System.AttributeUsage' attribute");
 531                                 return null;
 532                         }
 533
 534                         if (Type == TypeManager.indexer_name_type || Type == TypeManager.conditional_attribute_type) {
 535                                 string v = pos_values [0] as string;
 536                                 if (!Tokenizer.IsValidIdentifier (v) || Tokenizer.IsKeyword (v)) {
 537                                         Report.Error (633, ((Argument)PosArguments[0]).Expr.Location,
 538                                                 "The argument to the `{0}' attribute must be a valid identifier", GetSignatureForError ());
 539                                         return null;
 540                                 }
 541                         }
 542
 543                         if (Type == TypeManager.methodimpl_attr_type && pos_values.Length == 1 &&
 544                                 pd.Types [0] == TypeManager.short_type &&
 545                                 !System.Enum.IsDefined (typeof (MethodImplOptions), pos_values [0].ToString ())) {
 546                                 Error_AttributeEmitError ("Incorrect argument value.");
 547                                 return null;
 548                         }
 549
 550                         return constructor;
 551                 }
 552
 553                 protected virtual bool ResolveNamedArguments (EmitContext ec)
 554                 {
 555                         int named_arg_count = NamedArguments.Count;
 556
 557                         ArrayList field_infos = new ArrayList (named_arg_count);
 558                         ArrayList prop_infos  = new ArrayList (named_arg_count);
 559                         ArrayList field_values = new ArrayList (named_arg_count);
 560                         ArrayList prop_values = new ArrayList (named_arg_count);
 561
 562                         ArrayList seen_names = new ArrayList(named_arg_count);
 563
 564                         foreach (DictionaryEntry de in NamedArguments) {
 565                                 string member_name = (string) de.Key;
 566
 567                                 if (seen_names.Contains(member_name)) {
 568                                         Report.Error(643, Location, "'{0}' duplicate named attribute argument", member_name);
 569                                         return false;
 570                                 }
 571                                 seen_names.Add(member_name);
 572
 573                                 Argument a = (Argument) de.Value;
 574                                 if (!a.Resolve (ec, Location))
 575                                         return false;
 576
 577                                 Expression member = Expression.MemberLookup (
 578                                         ec.ContainerType, Type, member_name,
 579                                         MemberTypes.Field | MemberTypes.Property,
 580                                         BindingFlags.Public | BindingFlags.Instance,
 581                                         Location);
 582
 583                                 if (member == null) {
 584                                         member = Expression.MemberLookup (ec.ContainerType, Type, member_name,
 585                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 586                                                 Location);
 587
 588                                         if (member != null) {
 589                                                 Report.SymbolRelatedToPreviousError (member.Type);
 590                                                 Expression.ErrorIsInaccesible (Location, member.GetSignatureForError ());
 591                                                 return false;
 592                                         }
 593                                 }
 594
 595                                 if (member == null){
 596                                         Expression.Error_TypeDoesNotContainDefinition (Location, Type, member_name);
 597                                         return false;
 598                                 }
 599
 600                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 601                                         Error_InvalidNamedArgument (member_name);
 602                                         return false;
 603                                 }
 604
 605                                 if (a.Expr is TypeParameterExpr){
 606                                         Error_TypeParameterInAttribute (Location);
 607                                         return false;
 608                                 }
 609
 610                                 ObsoleteAttribute obsolete_attr;
 611
 612                                 if (member is PropertyExpr) {
 613                                         PropertyInfo pi = ((PropertyExpr) member).PropertyInfo;
 614
 615                                         if (!pi.CanWrite || !pi.CanRead) {
 616                                                 Report.SymbolRelatedToPreviousError (pi);
 617                                                 Error_InvalidNamedArgument (member_name);
 618                                                 return false;
 619                                         }
 620
 621                                         if (!IsValidArgumentType (member.Type)) {
 622                                                 Report.SymbolRelatedToPreviousError (pi);
 623                                                 Error_InvalidNamedAgrumentType (member_name);
 624                                                 return false;
 625                                         }
 626
 627                                         object value;
 628                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 629                                                 return false;
 630
 631                                         PropertyBase pb = TypeManager.GetProperty (pi);
 632                                         if (pb != null)
 633                                                 obsolete_attr = pb.GetObsoleteAttribute ();
 634                                         else
 635                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (pi);
 636
 637                                         prop_values.Add (value);
 638                                         prop_infos.Add (pi);
 639
 640                                 } else {
 641                                         FieldInfo fi = ((FieldExpr) member).FieldInfo;
 642
 643                                         if (fi.IsInitOnly) {
 644                                                 Error_InvalidNamedArgument (member_name);
 645                                                 return false;
 646                                         }
 647
 648                                         if (!IsValidArgumentType (member.Type)) {
 649                                                 Report.SymbolRelatedToPreviousError (fi);
 650                                                 Error_InvalidNamedAgrumentType (member_name);
 651                                                 return false;
 652                                         }
 653
 654                                         object value;
 655                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 656                                                 return false;
 657
 658                                         FieldBase fb = TypeManager.GetField (fi);
 659                                         if (fb != null)
 660                                                 obsolete_attr = fb.GetObsoleteAttribute ();
 661                                         else
 662                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (fi);
 663
 664                                         field_values.Add (value);
 665                                         field_infos.Add (fi);
 666                                 }
 667
 668                                 if (obsolete_attr != null && !Owner.ResolveContext.IsInObsoleteScope)
 669                                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, member.GetSignatureForError (), member.Location);
 670                         }
 671
 672                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 673                         field_info_arr = new FieldInfo [field_infos.Count];
 674                         field_values_arr = new object [field_values.Count];
 675                         prop_values_arr = new object [prop_values.Count];
 676
 677                         field_infos.CopyTo  (field_info_arr, 0);
 678                         field_values.CopyTo (field_values_arr, 0);
 679
 680                         prop_values.CopyTo  (prop_values_arr, 0);
 681                         prop_infos.CopyTo   (prop_info_arr, 0);
 682
 683                         return true;
 684                 }
 685
 686                 /// <summary>
 687                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 688                 /// </summary>
 689                 public string GetValidTargets ()
 690                 {
 691                         StringBuilder sb = new StringBuilder ();
 692                         AttributeTargets targets = GetAttributeUsage (Type).ValidOn;
 693
 694                         if ((targets & AttributeTargets.Assembly) != 0)
 695                                 sb.Append ("assembly, ");
 696
 697                         if ((targets & AttributeTargets.Module) != 0)
 698                                 sb.Append ("module, ");
 699
 700                         if ((targets & AttributeTargets.Class) != 0)
 701                                 sb.Append ("class, ");
 702
 703                         if ((targets & AttributeTargets.Struct) != 0)
 704                                 sb.Append ("struct, ");
 705
 706                         if ((targets & AttributeTargets.Enum) != 0)
 707                                 sb.Append ("enum, ");
 708
 709                         if ((targets & AttributeTargets.Constructor) != 0)
 710                                 sb.Append ("constructor, ");
 711
 712                         if ((targets & AttributeTargets.Method) != 0)
 713                                 sb.Append ("method, ");
 714
 715                         if ((targets & AttributeTargets.Property) != 0)
 716                                 sb.Append ("property, indexer, ");
 717
 718                         if ((targets & AttributeTargets.Field) != 0)
 719                                 sb.Append ("field, ");
 720
 721                         if ((targets & AttributeTargets.Event) != 0)
 722                                 sb.Append ("event, ");
 723
 724                         if ((targets & AttributeTargets.Interface) != 0)
 725                                 sb.Append ("interface, ");
 726
 727                         if ((targets & AttributeTargets.Parameter) != 0)
 728                                 sb.Append ("parameter, ");
 729
 730                         if ((targets & AttributeTargets.Delegate) != 0)
 731                                 sb.Append ("delegate, ");
 732
 733                         if ((targets & AttributeTargets.ReturnValue) != 0)
 734                                 sb.Append ("return, ");
 735
 736 #if NET_2_0
 737                         if ((targets & AttributeTargets.GenericParameter) != 0)
 738                                 sb.Append ("type parameter, ");
 739 #endif
 740                         return sb.Remove (sb.Length - 2, 2).ToString ();
 741                 }
 742
 743                 /// <summary>
 744                 /// Returns AttributeUsage attribute based on types hierarchy
 745                 /// </summary>
 746                 static AttributeUsageAttribute GetAttributeUsage (Type type)
 747                 {
 748                         AttributeUsageAttribute ua = usage_attr_cache [type] as AttributeUsageAttribute;
 749                         if (ua != null)
 750                                 return ua;
 751
 752                         Class attr_class = TypeManager.LookupClass (type);
 753
 754                         if (attr_class == null) {
 755                                 object[] usage_attr = type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 756                                 ua = (AttributeUsageAttribute)usage_attr [0];
 757                                 usage_attr_cache.Add (type, ua);
 758                                 return ua;
 759                         }
 760
 761                         Attribute a = null;
 762                         if (attr_class.OptAttributes != null)
 763                                 a = attr_class.OptAttributes.Search (TypeManager.attribute_usage_type);
 764
 765                         if (a == null) {
 766                                 if (attr_class.TypeBuilder.BaseType != TypeManager.attribute_type)
 767                                         ua = GetAttributeUsage (attr_class.TypeBuilder.BaseType);
 768                                 else
 769                                         ua = DefaultUsageAttribute;
 770                         } else {
 771                                 ua = a.GetAttributeUsageAttribute ();
 772                         }
 773
 774                         usage_attr_cache.Add (type, ua);
 775                         return ua;
 776                 }
 777
 778                 AttributeUsageAttribute GetAttributeUsageAttribute ()
 779                 {
 780                         if (pos_values == null)
 781                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 782                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 783                                 Resolve ();
 784
 785                         if (resolve_error)
 786                                 return DefaultUsageAttribute;
 787
 788                         AttributeUsageAttribute usage_attribute = new AttributeUsageAttribute ((AttributeTargets)pos_values [0]);
 789
 790                         object field = GetPropertyValue ("AllowMultiple");
 791                         if (field != null)
 792                                 usage_attribute.AllowMultiple = (bool)field;
 793
 794                         field = GetPropertyValue ("Inherited");
 795                         if (field != null)
 796                                 usage_attribute.Inherited = (bool)field;
 797
 798                         return usage_attribute;
 799                 }
 800
 801                 /// <summary>
 802                 /// Returns custom name of indexer
 803                 /// </summary>
 804                 public string GetIndexerAttributeValue ()
 805                 {
 806                         if (pos_values == null)
 807                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 808                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 809                                 Resolve ();
 810
 811                         if (resolve_error)
 812                                 return null;
 813
 814                         return pos_values [0] as string;
 815                 }
 816
 817                 /// <summary>
 818                 /// Returns condition of ConditionalAttribute
 819                 /// </summary>
 820                 public string GetConditionalAttributeValue ()
 821                 {
 822                         if (pos_values == null)
 823                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 824                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 825                                 Resolve ();
 826
 827                         if (resolve_error)
 828                                 return null;
 829
 830                         return (string)pos_values [0];
 831                 }
 832
 833                 /// <summary>
 834                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 835                 /// </summary>
 836                 public ObsoleteAttribute GetObsoleteAttribute ()
 837                 {
 838                         if (pos_values == null)
 839                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 840                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 841                                 Resolve ();
 842
 843                         if (resolve_error)
 844                                 return null;
 845
 846                         if (pos_values == null || pos_values.Length == 0)
 847                                 return new ObsoleteAttribute ();
 848
 849                         if (pos_values.Length == 1)
 850                                 return new ObsoleteAttribute ((string)pos_values [0]);
 851
 852                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 853                 }
 854
 855                 /// <summary>
 856                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 857                 /// before ApplyAttribute. We need to resolve the arguments.
 858                 /// This situation occurs when class deps is differs from Emit order.
 859                 /// </summary>
 860                 public bool GetClsCompliantAttributeValue ()
 861                 {
 862                         if (pos_values == null)
 863                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 864                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 865                                 Resolve ();
 866
 867                         if (resolve_error)
 868                                 return false;
 869
 870                         return (bool)pos_values [0];
 871                 }
 872
 873                 public Type GetCoClassAttributeValue ()
 874                 {
 875                         if (pos_values == null)
 876                                 Resolve ();
 877
 878                         if (resolve_error)
 879                                 return null;
 880
 881                         return (Type)pos_values [0];
 882                 }
 883
 884                 public bool CheckTarget ()
 885                 {
 886                         string[] valid_targets = Owner.ValidAttributeTargets;
 887                         if (ExplicitTarget == null || ExplicitTarget == valid_targets [0]) {
 888                                 Target = Owner.AttributeTargets;
 889                                 return true;
 890                         }
 891
 892                         // TODO: we can skip the first item
 893                         if (((IList) valid_targets).Contains (ExplicitTarget)) {
 894                                 switch (ExplicitTarget) {
 895                                 case "return": Target = AttributeTargets.ReturnValue; return true;
 896                                 case "param": Target = AttributeTargets.Parameter; return true;
 897                                 case "field": Target = AttributeTargets.Field; return true;
 898                                 case "method": Target = AttributeTargets.Method; return true;
 899                                 case "property": Target = AttributeTargets.Property; return true;
 900                                 }
 901                                 throw new InternalErrorException ("Unknown explicit target: " + ExplicitTarget);
 902                         }
 903
 904                         StringBuilder sb = new StringBuilder ();
 905                         foreach (string s in valid_targets) {
 906                                 sb.Append (s);
 907                                 sb.Append (", ");
 908                         }
 909                         sb.Remove (sb.Length - 2, 2);
 910                         Report.Error (657, Location, "`{0}' is not a valid attribute location for this declaration. " +
 911                                 "Valid attribute locations for this declaration are `{1}'", ExplicitTarget, sb.ToString ());
 912                         return false;
 913                 }
 914
 915                 /// <summary>
 916                 /// Tests permitted SecurityAction for assembly or other types
 917                 /// </summary>
 918                 protected virtual bool IsSecurityActionValid (bool for_assembly)
 919                 {
 920                         SecurityAction action = GetSecurityActionValue ();
 921
 922                         switch (action) {
 923                         case SecurityAction.Demand:
 924                         case SecurityAction.Assert:
 925                         case SecurityAction.Deny:
 926                         case SecurityAction.PermitOnly:
 927                         case SecurityAction.LinkDemand:
 928                         case SecurityAction.InheritanceDemand:
 929                                 if (!for_assembly)
 930                                         return true;
 931                                 break;
 932
 933                         case SecurityAction.RequestMinimum:
 934                         case SecurityAction.RequestOptional:
 935                         case SecurityAction.RequestRefuse:
 936                                 if (for_assembly)
 937                                         return true;
 938                                 break;
 939
 940                         default:
 941                                 Error_AttributeEmitError ("SecurityAction is out of range");
 942                                 return false;
 943                         }
 944
 945                         Error_AttributeEmitError (String.Concat ("SecurityAction `", action, "' is not valid for this declaration"));
 946                         return false;
 947                 }
 948
 949                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 950                 {
 951                         return (SecurityAction)pos_values [0];
 952                 }
 953
 954                 /// <summary>
 955                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 956                 /// </summary>
 957                 /// <returns></returns>
 958                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 959                 {
 960                         Type orig_assembly_type = null;
 961
 962                         if (TypeManager.LookupDeclSpace (Type) != null) {
 963                                 if (!RootContext.StdLib) {
 964                                         orig_assembly_type = Type.GetType (Type.FullName);
 965                                 } else {
 966                                         string orig_version_path = Environment.GetEnvironmentVariable ("__SECURITY_BOOTSTRAP_DB");
 967                                         if (orig_version_path == null) {
 968                                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 969                                                 return;
 970                                         }
 971
 972                                         if (orig_sec_assembly == null) {
 973                                                 string file = Path.Combine (orig_version_path, Driver.OutputFile);
 974                                                 orig_sec_assembly = Assembly.LoadFile (file);
 975                                         }
 976
 977                                         orig_assembly_type = orig_sec_assembly.GetType (Type.FullName, true);
 978                                         if (orig_assembly_type == null) {
 979                                                 Report.Warning (-112, 1, Location, "Self-referenced security attribute `{0}' " +
 980                                                                 "was not found in previous version of assembly");
 981                                                 return;
 982                                         }
 983                                 }
 984                         }
 985
 986                         SecurityAttribute sa;
 987                         // For all non-selfreferencing security attributes we can avoid all hacks
 988                         if (orig_assembly_type == null) {
 989                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 990
 991                                 if (prop_info_arr != null) {
 992                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 993                                                 PropertyInfo pi = prop_info_arr [i];
 994                                                 pi.SetValue (sa, prop_values_arr [i], null);
 995                                         }
 996                                 }
 997                         } else {
 998                                 // HACK: All security attributes have same ctor syntax
 999                                 sa = (SecurityAttribute) Activator.CreateInstance (orig_assembly_type, new object[] { GetSecurityActionValue () } );
1000
1001                                 // All types are from newly created assembly but for invocation with old one we need to convert them
1002                                 if (prop_info_arr != null) {
1003                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
1004                                                 PropertyInfo emited_pi = prop_info_arr [i];
1005                                                 // FIXME: We are missing return type filter
1006                                                 // TODO: pi can be null
1007                                                 PropertyInfo pi = orig_assembly_type.GetProperty (emited_pi.Name);
1008
1009                                                 object old_instance = TypeManager.IsEnumType (pi.PropertyType) ?
1010                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
1011                                                         prop_values_arr [i];
1012
1013                                                 pi.SetValue (sa, old_instance, null);
1014                                         }
1015                                 }
1016                         }
1017
1018                         IPermission perm;
1019                         perm = sa.CreatePermission ();
1020                         SecurityAction action = GetSecurityActionValue ();
1021
1022                         // IS is correct because for corlib we are using an instance from old corlib
1023                         if (!(perm is System.Security.CodeAccessPermission)) {
1024                                 switch (action) {
1025                                 case SecurityAction.Demand:
1026                                         action = (SecurityAction)13;
1027                                         break;
1028                                 case SecurityAction.LinkDemand:
1029                                         action = (SecurityAction)14;
1030                                         break;
1031                                 case SecurityAction.InheritanceDemand:
1032                                         action = (SecurityAction)15;
1033                                         break;
1034                                 }
1035                         }
1036
1037                         PermissionSet ps = (PermissionSet)permissions [action];
1038                         if (ps == null) {
1039                                 if (sa is PermissionSetAttribute)
1040                                         ps = new PermissionSet (sa.Unrestricted ? PermissionState.Unrestricted : PermissionState.None);
1041                                 else
1042                                         ps = new PermissionSet (PermissionState.None);
1043
1044                                 permissions.Add (action, ps);
1045                         } else if (!ps.IsUnrestricted () && (sa is PermissionSetAttribute) && sa.Unrestricted) {
1046                                 ps = ps.Union (new PermissionSet (PermissionState.Unrestricted));
1047                                 permissions [action] = ps;
1048                         }
1049                         ps.AddPermission (perm);
1050                 }
1051
1052                 public object GetPropertyValue (string name)
1053                 {
1054                         if (prop_info_arr == null)
1055                                 return null;
1056
1057                         for (int i = 0; i < prop_info_arr.Length; ++i) {
1058                                 if (prop_info_arr [i].Name == name)
1059                                         return prop_values_arr [i];
1060                         }
1061
1062                         return null;
1063                 }
1064
1065                 //
1066                 // Theoretically, we can get rid of this, since FieldBuilder.SetCustomAttribute()
1067                 // and ParameterBuilder.SetCustomAttribute() are supposed to handle this attribute.
1068                 // However, we can't, since it appears that the .NET 1.1 SRE hangs when given a MarshalAsAttribute.
1069                 //
1070 #if !NET_2_0
1071                 public UnmanagedMarshal GetMarshal (Attributable attr)
1072                 {
1073                         UnmanagedType UnmanagedType;
1074                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (UnmanagedType))
1075                                 UnmanagedType = (UnmanagedType) System.Enum.ToObject (typeof (UnmanagedType), pos_values [0]);
1076                         else
1077                                 UnmanagedType = (UnmanagedType) pos_values [0];
1078
1079                         object value = GetFieldValue ("SizeParamIndex");
1080                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
1081                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
1082                                 return null;
1083                         }
1084
1085                         object o = GetFieldValue ("ArraySubType");
1086                         UnmanagedType array_sub_type = o == null ? (UnmanagedType) 0x50 /* NATIVE_MAX */ : (UnmanagedType) o;
1087
1088                         switch (UnmanagedType) {
1089                         case UnmanagedType.CustomMarshaler: {
1090                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
1091                                         BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1092                                 if (define_custom == null) {
1093                                         Report.RuntimeMissingSupport (Location, "set marshal info");
1094                                         return null;
1095                                 }
1096
1097                                 object [] args = new object [4];
1098                                 args [0] = GetFieldValue ("MarshalTypeRef");
1099                                 args [1] = GetFieldValue ("MarshalCookie");
1100                                 args [2] = GetFieldValue ("MarshalType");
1101                                 args [3] = Guid.Empty;
1102                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
1103                         }
1104                         case UnmanagedType.LPArray: {
1105                                 object size_const = GetFieldValue ("SizeConst");
1106                                 object size_param_index = GetFieldValue ("SizeParamIndex");
1107
1108                                 if ((size_const != null) || (size_param_index != null)) {
1109                                         MethodInfo define_array = typeof (UnmanagedMarshal).GetMethod ("DefineLPArrayInternal",
1110                                                 BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1111                                         if (define_array == null) {
1112                                                 Report.RuntimeMissingSupport (Location, "set marshal info");
1113                                                 return null;
1114                                         }
1115
1116                                         object [] args = new object [3];
1117                                         args [0] = array_sub_type;
1118                                         args [1] = size_const == null ? -1 : size_const;
1119                                         args [2] = size_param_index == null ? -1 : size_param_index;
1120                                         return (UnmanagedMarshal) define_array.Invoke (null, args);
1121                                 }
1122                                 else
1123                                         return UnmanagedMarshal.DefineLPArray (array_sub_type);
1124                         }
1125                         case UnmanagedType.SafeArray:
1126                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
1127
1128                         case UnmanagedType.ByValArray:
1129                                 FieldBase fm = attr as FieldBase;
1130                                 if (fm == null) {
1131                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
1132                                         return null;
1133                                 }
1134                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
1135
1136                         case UnmanagedType.ByValTStr:
1137                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
1138
1139                         default:
1140                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
1141                         }
1142                 }
1143
1144                 object GetFieldValue (string name)
1145                 {
1146                         int i;
1147                         if (field_info_arr == null)
1148                                 return null;
1149                         i = 0;
1150                         foreach (FieldInfo fi in field_info_arr) {
1151                                 if (fi.Name == name)
1152                                         return GetValue (field_values_arr [i]);
1153                                 i++;
1154                         }
1155                         return null;
1156                 }
1157
1158                 static object GetValue (object value)
1159                 {
1160                         if (value is EnumConstant)
1161                                 return ((EnumConstant) value).GetValue ();
1162                         else
1163                                 return value;
1164                 }
1165
1166 #endif
1167
1168                 public CharSet GetCharSetValue ()
1169                 {
1170                         return (CharSet)System.Enum.Parse (typeof (CharSet), pos_values [0].ToString ());
1171                 }
1172
1173                 public bool HasField (string fieldName)
1174                 {
1175                         if (field_info_arr == null)
1176                                 return false;
1177
1178                         foreach (FieldInfo fi in field_info_arr) {
1179                                 if (fi.Name == fieldName)
1180                                         return true;
1181                         }
1182
1183                         return false;
1184                 }
1185
1186                 public bool IsInternalMethodImplAttribute {
1187                         get {
1188                                 if (Type != TypeManager.methodimpl_attr_type)
1189                                         return false;
1190
1191                                 MethodImplOptions options;
1192                                 if (pos_values[0].GetType () != typeof (MethodImplOptions))
1193                                         options = (MethodImplOptions)System.Enum.ToObject (typeof (MethodImplOptions), pos_values[0]);
1194                                 else
1195                                         options = (MethodImplOptions)pos_values[0];
1196
1197                                 return (options & MethodImplOptions.InternalCall) != 0;
1198                         }
1199                 }
1200
1201                 public LayoutKind GetLayoutKindValue ()
1202                 {
1203                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (LayoutKind))
1204                                 return (LayoutKind)System.Enum.ToObject (typeof (LayoutKind), pos_values [0]);
1205
1206                         return (LayoutKind)pos_values [0];
1207                 }
1208
1209                 public object GetParameterDefaultValue ()
1210                 {
1211                         return pos_values [0];
1212                 }
1213
1214                 public override bool Equals (object obj)
1215                 {
1216                         Attribute a = obj as Attribute;
1217                         if (a == null)
1218                                 return false;
1219
1220                         return Type == a.Type && Target == a.Target;
1221                 }
1222
1223                 public override int GetHashCode ()
1224                 {
1225                         return base.GetHashCode ();
1226                 }
1227
1228                 /// <summary>
1229                 /// Emit attribute for Attributable symbol
1230                 /// </summary>
1231                 public void Emit (ListDictionary allEmitted)
1232                 {
1233                         CustomAttributeBuilder cb = Resolve ();
1234                         if (cb == null)
1235                                 return;
1236
1237                         AttributeUsageAttribute usage_attr = GetAttributeUsage (Type);
1238                         if ((usage_attr.ValidOn & Target) == 0) {
1239                                 Report.Error (592, Location, "The attribute `{0}' is not valid on this declaration type. " +
1240                                               "It is valid on `{1}' declarations only",
1241                                         GetSignatureForError (), GetValidTargets ());
1242                                 return;
1243                         }
1244
1245                         try {
1246                                 foreach (Attributable owner in owners)
1247                                         owner.ApplyAttributeBuilder (this, cb);
1248                         }
1249                         catch (Exception e) {
1250                                 Error_AttributeEmitError (e.Message);
1251                                 return;
1252                         }
1253
1254                         if (!usage_attr.AllowMultiple && allEmitted != null) {
1255                                 if (allEmitted.Contains (this)) {
1256                                         ArrayList a = allEmitted [this] as ArrayList;
1257                                         if (a == null) {
1258                                                 a = new ArrayList (2);
1259                                                 allEmitted [this] = a;
1260                                         }
1261                                         a.Add (this);
1262                                 } else {
1263                                         allEmitted.Add (this, null);
1264                                 }
1265                         }
1266
1267                         if (!RootContext.VerifyClsCompliance)
1268                                 return;
1269
1270                         // Here we are testing attribute arguments for array usage (error 3016)
1271                         if (Owner.IsClsComplianceRequired ()) {
1272                                 if (PosArguments != null) {
1273                                         foreach (Argument arg in PosArguments) {
1274                                                 // Type is undefined (was error 246)
1275                                                 if (arg.Type == null)
1276                                                         return;
1277
1278                                                 if (arg.Type.IsArray) {
1279                                                         Report.Warning (3016, 1, Location, "Arrays as attribute arguments are not CLS-compliant");
1280                                                         return;
1281                                                 }
1282                                         }
1283                                 }
1284
1285                                 if (NamedArguments == null)
1286                                         return;
1287
1288                                 foreach (DictionaryEntry de in NamedArguments) {
1289                                         Argument arg  = (Argument) de.Value;
1290
1291                                         // Type is undefined (was error 246)
1292                                         if (arg.Type == null)
1293                                                 return;
1294
1295                                         if (arg.Type.IsArray) {
1296                                                 Report.Warning (3016, 1, Location, "Arrays as attribute arguments are not CLS-compliant");
1297                                                 return;
1298                                         }
1299                                 }
1300                         }
1301                 }
1302
1303                 private Expression GetValue ()
1304                 {
1305                         if (PosArguments == null || PosArguments.Count < 1)
1306                                 return null;
1307
1308                         return ((Argument) PosArguments [0]).Expr;
1309                 }
1310
1311                 public string GetString ()
1312                 {
1313                         Expression e = GetValue ();
1314                         if (e is StringConstant)
1315                                 return ((StringConstant)e).Value;
1316                         return null;
1317                 }
1318
1319                 public bool GetBoolean ()
1320                 {
1321                         Expression e = GetValue ();
1322                         if (e is BoolConstant)
1323                                 return ((BoolConstant)e).Value;
1324                         return false;
1325                 }
1326
1327                 public Type GetArgumentType ()
1328                 {
1329                         TypeOf e = GetValue () as TypeOf;
1330                         if (e == null)
1331                                 return null;
1332                         return e.TypeArgument;
1333                 }
1334
1335                 public override Expression CreateExpressionTree (EmitContext ec)
1336                 {
1337                         throw new NotSupportedException ("ET");
1338                 }
1339
1340                 public override Expression DoResolve (EmitContext ec)
1341                 {
1342                         throw new NotImplementedException ();
1343                 }
1344
1345                 public override void Emit (EmitContext ec)
1346                 {
1347                         throw new NotImplementedException ();
1348                 }
1349         }
1350
1351
1352         /// <summary>
1353         /// For global attributes (assembly, module) we need special handling.
1354         /// Attributes can be located in the several files
1355         /// </summary>
1356         public class GlobalAttribute : Attribute
1357         {
1358                 public readonly NamespaceEntry ns;
1359
1360                 public GlobalAttribute (NamespaceEntry ns, string target,
1361                                         Expression left_expr, string identifier, object[] args, Location loc, bool nameEscaped):
1362                         base (target, left_expr, identifier, args, loc, nameEscaped)
1363                 {
1364                         this.ns = ns;
1365                         this.owners = new Attributable[1];
1366                 }
1367
1368                 public override void AttachTo (Attributable owner)
1369                 {
1370                         if (ExplicitTarget == "assembly") {
1371                                 owners [0] = CodeGen.Assembly;
1372                                 return;
1373                         }
1374                         if (ExplicitTarget == "module") {
1375                                 owners [0] = CodeGen.Module;
1376                                 return;
1377                         }
1378                         throw new NotImplementedException ("Unknown global explicit target " + ExplicitTarget);
1379                 }
1380
1381                 void Enter ()
1382                 {
1383                         // RootContext.ToplevelTypes has a single NamespaceEntry which gets overwritten
1384                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1385                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1386                         // that the NamespaceEntry is right, just overwrite it.
1387                         //
1388                         // Precondition: RootContext.ToplevelTypes == null
1389
1390                         if (RootContext.ToplevelTypes.NamespaceEntry != null)
1391                                 throw new InternalErrorException (Location + " non-null NamespaceEntry");
1392
1393                         RootContext.ToplevelTypes.NamespaceEntry = ns;
1394                 }
1395
1396                 protected override bool IsSecurityActionValid (bool for_assembly)
1397                 {
1398                         return base.IsSecurityActionValid (true);
1399                 }
1400
1401                 void Leave ()
1402                 {
1403                         RootContext.ToplevelTypes.NamespaceEntry = null;
1404                 }
1405
1406                 protected override TypeExpr ResolveAsTypeTerminal (Expression expr, IResolveContext ec, bool silent)
1407                 {
1408                         try {
1409                                 Enter ();
1410                                 return base.ResolveAsTypeTerminal (expr, ec, silent);
1411                         }
1412                         finally {
1413                                 Leave ();
1414                         }
1415                 }
1416
1417                 protected override ConstructorInfo ResolveConstructor (EmitContext ec)
1418                 {
1419                         try {
1420                                 Enter ();
1421                                 return base.ResolveConstructor (ec);
1422                         }
1423                         finally {
1424                                 Leave ();
1425                         }
1426                 }
1427
1428                 protected override bool ResolveNamedArguments (EmitContext ec)
1429                 {
1430                         try {
1431                                 Enter ();
1432                                 return base.ResolveNamedArguments (ec);
1433                         }
1434                         finally {
1435                                 Leave ();
1436                         }
1437                 }
1438         }
1439
1440         public class Attributes {
1441                 public readonly ArrayList Attrs;
1442
1443                 public Attributes (Attribute a)
1444                 {
1445                         Attrs = new ArrayList ();
1446                         Attrs.Add (a);
1447                 }
1448
1449                 public Attributes (ArrayList attrs)
1450                 {
1451                         Attrs = attrs;
1452                 }
1453
1454                 public void AddAttributes (ArrayList attrs)
1455                 {
1456                         Attrs.AddRange (attrs);
1457                 }
1458
1459                 public void AttachTo (Attributable attributable)
1460                 {
1461                         foreach (Attribute a in Attrs)
1462                                 a.AttachTo (attributable);
1463                 }
1464
1465                 public Attributes Clone ()
1466                 {
1467                         ArrayList al = new ArrayList (Attrs.Count);
1468                         foreach (Attribute a in Attrs)
1469                                 al.Add (a.Clone ());
1470
1471                         return new Attributes (al);
1472                 }
1473
1474                 /// <summary>
1475                 /// Checks whether attribute target is valid for the current element
1476                 /// </summary>
1477                 public bool CheckTargets ()
1478                 {
1479                         foreach (Attribute a in Attrs) {
1480                                 if (!a.CheckTarget ())
1481                                         return false;
1482                         }
1483                         return true;
1484                 }
1485
1486                 public Attribute Search (Type t)
1487                 {
1488                         foreach (Attribute a in Attrs) {
1489                                 if (a.ResolveType () == t)
1490                                         return a;
1491                         }
1492                         return null;
1493                 }
1494
1495                 /// <summary>
1496                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1497                 /// </summary>
1498                 public Attribute[] SearchMulti (Type t)
1499                 {
1500                         ArrayList ar = null;
1501
1502                         foreach (Attribute a in Attrs) {
1503                                 if (a.ResolveType () == t) {
1504                                         if (ar == null)
1505                                                 ar = new ArrayList ();
1506                                         ar.Add (a);
1507                                 }
1508                         }
1509
1510                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1511                 }
1512
1513                 public void Emit ()
1514                 {
1515                         CheckTargets ();
1516
1517                         ListDictionary ld = Attrs.Count > 1 ? new ListDictionary () : null;
1518
1519                         foreach (Attribute a in Attrs)
1520                                 a.Emit (ld);
1521
1522                         if (ld == null || ld.Count == 0)
1523                                 return;
1524
1525                         foreach (DictionaryEntry d in ld) {
1526                                 if (d.Value == null)
1527                                         continue;
1528
1529                                 foreach (Attribute collision in (ArrayList)d.Value)
1530                                         Report.SymbolRelatedToPreviousError (collision.Location, "");
1531
1532                                 Attribute a = (Attribute)d.Key;
1533                                 Report.Error (579, a.Location, "The attribute `{0}' cannot be applied multiple times",
1534                                         a.GetSignatureForError ());
1535                         }
1536                 }
1537
1538                 public bool Contains (Type t)
1539                 {
1540                         return Search (t) != null;
1541                 }
1542         }
1543
1544         /// <summary>
1545         /// Helper class for attribute verification routine.
1546         /// </summary>
1547         sealed class AttributeTester
1548         {
1549                 static PtrHashtable analyzed_types;
1550                 static PtrHashtable analyzed_types_obsolete;
1551                 static PtrHashtable analyzed_member_obsolete;
1552                 static PtrHashtable analyzed_method_excluded;
1553                 static PtrHashtable fixed_buffer_cache;
1554
1555                 static object TRUE = new object ();
1556                 static object FALSE = new object ();
1557
1558                 static AttributeTester ()
1559                 {
1560                         Reset ();
1561                 }
1562
1563                 private AttributeTester ()
1564                 {
1565                 }
1566
1567                 public static void Reset ()
1568                 {
1569                         analyzed_types = new PtrHashtable ();
1570                         analyzed_types_obsolete = new PtrHashtable ();
1571                         analyzed_member_obsolete = new PtrHashtable ();
1572                         analyzed_method_excluded = new PtrHashtable ();
1573                         fixed_buffer_cache = new PtrHashtable ();
1574                 }
1575
1576                 public enum Result {
1577                         Ok,
1578                         RefOutArrayError,
1579                         ArrayArrayError
1580                 }
1581
1582                 /// <summary>
1583                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1584                 /// It tests differing only in ref or out, or in array rank.
1585                 /// </summary>
1586                 public static Result AreOverloadedMethodParamsClsCompliant (AParametersCollection pa, AParametersCollection pb)
1587                 {
1588                         Type [] types_a = pa.Types;
1589                         Type [] types_b = pb.Types;
1590                         if (types_a == null || types_b == null)
1591                                 return Result.Ok;
1592
1593                         if (types_a.Length != types_b.Length)
1594                                 return Result.Ok;
1595
1596                         Result result = Result.Ok;
1597                         for (int i = 0; i < types_b.Length; ++i) {
1598                                 Type aType = types_a [i];
1599                                 Type bType = types_b [i];
1600
1601                                 if (aType.IsArray && bType.IsArray) {
1602                                         Type a_el_type = TypeManager.GetElementType (aType);
1603                                         Type b_el_type = TypeManager.GetElementType (bType);
1604                                         if (aType.GetArrayRank () != bType.GetArrayRank () && a_el_type == b_el_type) {
1605                                                 result = Result.RefOutArrayError;
1606                                                 continue;
1607                                         }
1608
1609                                         if (a_el_type.IsArray || b_el_type.IsArray) {
1610                                                 result = Result.ArrayArrayError;
1611                                                 continue;
1612                                         }
1613                                 }
1614
1615                                 if (aType != bType)
1616                                         return Result.Ok;
1617
1618                                 const Parameter.Modifier out_ref_mod = (Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
1619                                 if ((pa.FixedParameters[i].ModFlags & out_ref_mod) != (pb.FixedParameters[i].ModFlags & out_ref_mod))
1620                                         result = Result.RefOutArrayError;
1621                         }
1622                         return result;
1623                 }
1624
1625                 /// <summary>
1626                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1627                 /// </summary>
1628                 public static bool IsClsCompliant (Type type)
1629                 {
1630                         if (type == null)
1631                                 return true;
1632
1633                         object type_compliance = analyzed_types[type];
1634                         if (type_compliance != null)
1635                                 return type_compliance == TRUE;
1636
1637                         if (type.IsPointer) {
1638                                 analyzed_types.Add (type, FALSE);
1639                                 return false;
1640                         }
1641
1642                         bool result;
1643                         if (type.IsArray) {
1644                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1645                         } else if (TypeManager.IsNullableType (type)) {
1646                                 result = IsClsCompliant (TypeManager.GetTypeArguments (type) [0]);
1647                         } else {
1648                                 result = AnalyzeTypeCompliance (type);
1649                         }
1650                         analyzed_types.Add (type, result ? TRUE : FALSE);
1651                         return result;
1652                 }
1653
1654                 /// <summary>
1655                 /// Returns IFixedBuffer implementation if field is fixed buffer else null.
1656                 /// </summary>
1657                 public static IFixedBuffer GetFixedBuffer (FieldInfo fi)
1658                 {
1659                         // Fixed buffer helper type is generated as value type
1660                         if (TypeManager.IsReferenceType (fi.FieldType))
1661                                 return null;
1662
1663                         FieldBase fb = TypeManager.GetField (fi);
1664                         if (fb != null) {
1665                                 return fb as IFixedBuffer;
1666                         }
1667
1668                         if (TypeManager.GetConstant (fi) != null)
1669                                 return null;
1670
1671                         object o = fixed_buffer_cache [fi];
1672                         if (o == null) {
1673                                 if (TypeManager.fixed_buffer_attr_type == null)
1674                                         return null;
1675
1676                                 if (!fi.IsDefined (TypeManager.fixed_buffer_attr_type, false)) {
1677                                         fixed_buffer_cache.Add (fi, FALSE);
1678                                         return null;
1679                                 }
1680
1681                                 IFixedBuffer iff = new FixedFieldExternal (fi);
1682                                 fixed_buffer_cache.Add (fi, iff);
1683                                 return iff;
1684                         }
1685
1686                         if (o == FALSE)
1687                                 return null;
1688
1689                         return (IFixedBuffer)o;
1690                 }
1691
1692                 public static void VerifyModulesClsCompliance ()
1693                 {
1694                         Module[] modules = RootNamespace.Global.Modules;
1695                         if (modules == null)
1696                                 return;
1697
1698                         // The first module is generated assembly
1699                         for (int i = 1; i < modules.Length; ++i) {
1700                                 Module module = modules [i];
1701                                 if (!GetClsCompliantAttributeValue (module, null)) {
1702                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute " +
1703                                                       "to match the assembly", module.Name);
1704                                         return;
1705                                 }
1706                         }
1707                 }
1708
1709                 public static Type GetImportedIgnoreCaseClsType (string name)
1710                 {
1711                         foreach (Assembly a in RootNamespace.Global.Assemblies) {
1712                                 Type t = a.GetType (name, false, true);
1713                                 if (t == null)
1714                                         continue;
1715
1716                                 if (IsClsCompliant (t))
1717                                         return t;
1718                         }
1719                         return null;
1720                 }
1721
1722                 static bool GetClsCompliantAttributeValue (ICustomAttributeProvider attribute_provider, Assembly a)
1723                 {
1724                         if (TypeManager.cls_compliant_attribute_type == null)
1725                                 return false;
1726
1727                         object[] cls_attr = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1728                         if (cls_attr.Length == 0) {
1729                                 if (a == null)
1730                                         return false;
1731
1732                                 return GetClsCompliantAttributeValue (a, null);
1733                         }
1734
1735                         return ((CLSCompliantAttribute)cls_attr [0]).IsCompliant;
1736                 }
1737
1738                 static bool AnalyzeTypeCompliance (Type type)
1739                 {
1740                         type = TypeManager.DropGenericTypeArguments (type);
1741                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1742                         if (ds != null) {
1743                                 return ds.IsClsComplianceRequired ();
1744                         }
1745
1746                         if (TypeManager.IsGenericParameter (type))
1747                                 return true;
1748
1749                         return GetClsCompliantAttributeValue (type, type.Assembly);
1750                 }
1751
1752                 /// <summary>
1753                 /// Returns instance of ObsoleteAttribute when type is obsolete
1754                 /// </summary>
1755                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1756                 {
1757                         object type_obsolete = analyzed_types_obsolete [type];
1758                         if (type_obsolete == FALSE)
1759                                 return null;
1760
1761                         if (type_obsolete != null)
1762                                 return (ObsoleteAttribute)type_obsolete;
1763
1764                         ObsoleteAttribute result = null;
1765                         if (TypeManager.HasElementType (type)) {
1766                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1767                         } else if (TypeManager.IsGenericParameter (type))
1768                                 result = null;  // TODO: throw new NotSupportedException ()
1769                         else if (TypeManager.IsGenericType (type) && !TypeManager.IsGenericTypeDefinition (type)) {
1770                                 return GetObsoleteAttribute (TypeManager.DropGenericTypeArguments (type));
1771                         } else {
1772                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1773
1774                                 // Type is external, we can get attribute directly
1775                                 if (type_ds == null) {
1776                                         if (TypeManager.obsolete_attribute_type != null) {
1777                                                 object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1778                                                 if (attribute.Length == 1)
1779                                                         result = (ObsoleteAttribute) attribute[0];
1780                                         }
1781                                 } else {
1782                                         result = type_ds.GetObsoleteAttribute ();
1783                                 }
1784                         }
1785
1786                         // Cannot use .Add because of corlib bootstrap
1787                         analyzed_types_obsolete [type] = result == null ? FALSE : result;
1788                         return result;
1789                 }
1790
1791                 /// <summary>
1792                 /// Returns instance of ObsoleteAttribute when method is obsolete
1793                 /// </summary>
1794                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1795                 {
1796                         IMethodData mc = TypeManager.GetMethod (mb);
1797                         if (mc != null)
1798                                 return mc.GetObsoleteAttribute ();
1799
1800                         // compiler generated methods are not registered by AddMethod
1801                         if (mb.DeclaringType is TypeBuilder)
1802                                 return null;
1803
1804                         MemberInfo mi = TypeManager.GetPropertyFromAccessor (mb);
1805                         if (mi != null)
1806                                 return GetMemberObsoleteAttribute (mi);
1807
1808                         mi = TypeManager.GetEventFromAccessor (mb);
1809                         if (mi != null)
1810                                 return GetMemberObsoleteAttribute (mi);
1811
1812                         return GetMemberObsoleteAttribute (mb);
1813                 }
1814
1815                 /// <summary>
1816                 /// Returns instance of ObsoleteAttribute when member is obsolete
1817                 /// </summary>
1818                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1819                 {
1820                         object type_obsolete = analyzed_member_obsolete [mi];
1821                         if (type_obsolete == FALSE)
1822                                 return null;
1823
1824                         if (type_obsolete != null)
1825                                 return (ObsoleteAttribute)type_obsolete;
1826
1827                         if ((mi.DeclaringType is TypeBuilder) || TypeManager.IsGenericType (mi.DeclaringType))
1828                                 return null;
1829
1830                         if (TypeManager.obsolete_attribute_type == null)
1831                                 return null;
1832
1833                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false)
1834                                 as ObsoleteAttribute;
1835                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1836                         return oa;
1837                 }
1838
1839                 /// <summary>
1840                 /// Common method for Obsolete error/warning reporting.
1841                 /// </summary>
1842                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1843                 {
1844                         if (oa.IsError) {
1845                                 Report.Error (619, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1846                                 return;
1847                         }
1848
1849                         if (oa.Message == null || oa.Message.Length == 0) {
1850                                 Report.Warning (612, 1, loc, "`{0}' is obsolete", member);
1851                                 return;
1852                         }
1853                         Report.Warning (618, 2, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1854                 }
1855
1856                 public static bool IsConditionalMethodExcluded (MethodBase mb, Location loc)
1857                 {
1858                         object excluded = analyzed_method_excluded [mb];
1859                         if (excluded != null)
1860                                 return excluded == TRUE ? true : false;
1861
1862                         if (TypeManager.conditional_attribute_type == null)
1863                                 return false;
1864
1865                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true)
1866                                 as ConditionalAttribute[];
1867                         if (attrs.Length == 0) {
1868                                 analyzed_method_excluded.Add (mb, FALSE);
1869                                 return false;
1870                         }
1871
1872                         foreach (ConditionalAttribute a in attrs) {
1873                                 if (loc.CompilationUnit.IsConditionalDefined (a.ConditionString)) {
1874                                         analyzed_method_excluded.Add (mb, FALSE);
1875                                         return false;
1876                                 }
1877                         }
1878
1879                         analyzed_method_excluded.Add (mb, TRUE);
1880                         return true;
1881                 }
1882
1883                 /// <summary>
1884                 /// Analyzes class whether it has attribute which has ConditionalAttribute
1885                 /// and its condition is not defined.
1886                 /// </summary>
1887                 public static bool IsAttributeExcluded (Type type, Location loc)
1888                 {
1889                         if (!type.IsClass)
1890                                 return false;
1891
1892                         Class class_decl = TypeManager.LookupDeclSpace (type) as Class;
1893
1894                         // TODO: add caching
1895                         // TODO: merge all Type bases attribute caching to one cache to save memory
1896                         if (class_decl == null && TypeManager.conditional_attribute_type != null) {
1897                                 object[] attributes = type.GetCustomAttributes (TypeManager.conditional_attribute_type, false);
1898                                 foreach (ConditionalAttribute ca in attributes) {
1899                                         if (loc.CompilationUnit.IsConditionalDefined (ca.ConditionString))
1900                                                 return false;
1901                                 }
1902                                 return attributes.Length > 0;
1903                         }
1904
1905                         return class_decl.IsExcluded ();
1906                 }
1907
1908                 public static Type GetCoClassAttribute (Type type)
1909                 {
1910                         TypeContainer tc = TypeManager.LookupInterface (type);
1911                         if (tc == null) {
1912                                 if (TypeManager.coclass_attr_type == null)
1913                                         return null;
1914
1915                                 object[] o = type.GetCustomAttributes (TypeManager.coclass_attr_type, false);
1916                                 if (o.Length < 1)
1917                                         return null;
1918                                 return ((System.Runtime.InteropServices.CoClassAttribute)o[0]).CoClass;
1919                         }
1920
1921                         if (tc.OptAttributes == null || TypeManager.coclass_attr_type == null)
1922                                 return null;
1923
1924                         Attribute a = tc.OptAttributes.Search (TypeManager.coclass_attr_type);
1925                         if (a == null)
1926                                 return null;
1927
1928                         return a.GetCoClassAttributeValue ();
1929                 }
1930         }
1931 }