mcs/gmcs/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 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 //
  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
  25 namespace Mono.CSharp {
  26
  27         /// <summary>
  28         ///   Base class for objects that can have Attributes applied to them.
  29         /// </summary>
  30         public abstract class Attributable {
  31                 /// <summary>
  32                 ///   Attributes for this type
  33                 /// </summary>
  34                 Attributes attributes;
  35
  36                 public Attributable (Attributes attrs)
  37                 {
  38                         attributes = attrs;
  39                 }
  40
  41                 public Attributes OptAttributes
  42                 {
  43                         get {
  44                                 return attributes;
  45                         }
  46                         set {
  47                                 attributes = value;
  48                         }
  49                 }
  50
  51                 /// <summary>
  52                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  53                 /// </summary>
  54                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb);
  55
  56                 /// <summary>
  57                 /// Returns one AttributeTarget for this element.
  58                 /// </summary>
  59                 public abstract AttributeTargets AttributeTargets { get; }
  60
  61                 public abstract bool IsClsCompliaceRequired (DeclSpace ds);
  62
  63                 /// <summary>
  64                 /// Gets list of valid attribute targets for explicit target declaration.
  65                 /// The first array item is default target. Don't break this rule.
  66                 /// </summary>
  67                 public abstract string[] ValidAttributeTargets { get; }
  68         };
  69
  70         public class Attribute {
  71                 public readonly string ExplicitTarget;
  72                 public AttributeTargets Target;
  73
  74                 public readonly string    Name;
  75                 public readonly Expression LeftExpr;
  76                 public readonly string Identifier;
  77
  78                 public readonly ArrayList Arguments;
  79
  80                 public readonly Location Location;
  81
  82                 public Type Type;
  83
  84                 bool resolve_error;
  85
  86                 static AttributeUsageAttribute DefaultUsageAttribute = new AttributeUsageAttribute (AttributeTargets.All);
  87
  88                 CustomAttributeBuilder cb;
  89
  90                 // non-null if named args present after Resolve () is called
  91                 PropertyInfo [] prop_info_arr;
  92                 FieldInfo [] field_info_arr;
  93                 object [] field_values_arr;
  94                 object [] prop_values_arr;
  95                 object [] pos_values;
  96
  97                 static PtrHashtable usage_attr_cache = new PtrHashtable ();
  98
  99                 public Attribute (string target, Expression left_expr, string identifier, ArrayList args, Location loc)
 100                 {
 101                         LeftExpr = left_expr;
 102                         Identifier = identifier;
 103                         Name = LeftExpr == null ? identifier : LeftExpr + "." + identifier;
 104                         Arguments = args;
 105                         Location = loc;
 106                         ExplicitTarget = target;
 107                 }
 108
 109                 void Error_InvalidNamedArgument (string name)
 110                 {
 111                         Report.Error (617, Location, "Invalid attribute argument: '{0}'.  Argument must be fields " +
 112                                       "fields which are not readonly, static or const;  or read-write instance properties.",
 113                                       name);
 114                 }
 115
 116                 static void Error_AttributeArgumentNotValid (string extra, Location loc)
 117                 {
 118                         Report.Error (182, loc,
 119                                       "An attribute argument must be a constant expression, typeof " +
 120                                       "expression or array creation expression" + extra);
 121                 }
 122
 123                 static void Error_AttributeArgumentNotValid (Location loc)
 124                 {
 125                         Error_AttributeArgumentNotValid ("", loc);
 126                 }
 127
 128                 static void Error_TypeParameterInAttribute (Location loc)
 129                 {
 130                         Report.Error (
 131                                 -202, loc, "Can not use a type parameter in an attribute");
 132                 }
 133
 134                 /// <summary>
 135                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 136                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 137                 /// </summary>
 138                 public void Error_AttributeEmitError (string inner)
 139                 {
 140                         Report.Error (647, Location, "Error emitting '{0}' attribute because '{1}'", Name, inner);
 141                 }
 142
 143                 public void Error_InvalidSecurityParent ()
 144                 {
 145                         Error_AttributeEmitError ("it is attached to invalid parent");
 146                 }
 147
 148                 void Error_AttributeConstructorMismatch ()
 149                 {
 150                         Report.Error (-6, Location,
 151                                       "Could not find a constructor for this argument list.");
 152                 }
 153
 154                 void ResolvePossibleAttributeTypes (EmitContext ec, out Type t1, out Type t2)
 155                 {
 156                         t1 = null;
 157                         t2 = null;
 158
 159                         FullNamedExpression n1 = null;
 160                         FullNamedExpression n2 = null;
 161                         string IdentifierAttribute = Identifier + "Attribute";
 162                         if (LeftExpr == null) {
 163                                 n1 = new SimpleName (Identifier, Location).ResolveAsTypeStep (ec);
 164
 165                                 // FIXME: Shouldn't do this for quoted attributes: [@A]
 166                                 n2 = new SimpleName (IdentifierAttribute, Location).ResolveAsTypeStep (ec);
 167                         } else {
 168                                 FullNamedExpression l = LeftExpr.ResolveAsTypeStep (ec);
 169                                 if (l == null) {
 170                                         Report.Error (246, Location, "Couldn't find namespace or type '{0}'", LeftExpr);
 171                                         return;
 172                                 }
 173                                 n1 = new MemberAccess (l, Identifier, Location).ResolveNamespaceOrType (ec, true);
 174
 175                                 // FIXME: Shouldn't do this for quoted attributes: [X.@A]
 176                                 n2 = new MemberAccess (l, IdentifierAttribute, Location).ResolveNamespaceOrType (ec, true);
 177                         }
 178
 179                         TypeExpr te1 = n1 == null ? null : n1 as TypeExpr;
 180                         TypeExpr te2 = n2 == null ? null : n2 as TypeExpr;
 181
 182                         if (te1 != null)
 183                                 t1 = te1.ResolveType (ec);
 184                         if (te2 != null)
 185                                 t2 = te2.ResolveType (ec);
 186                 }
 187
 188                 /// <summary>
 189                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 190                 /// </summary>
 191                 Type CheckAttributeType (EmitContext ec)
 192                 {
 193                         Type t1, t2;
 194                         ResolvePossibleAttributeTypes (ec, out t1, out t2);
 195
 196                         string NameAttribute = Name + "Attribute";
 197
 198                         String err0616 = null;
 199                         if (t1 != null && ! t1.IsSubclassOf (TypeManager.attribute_type)) {
 200                                 t1 = null;
 201                                 err0616 = "'" + Name + "': is not an attribute class";
 202                         }
 203                         if (t2 != null && ! t2.IsSubclassOf (TypeManager.attribute_type)) {
 204                                 t2 = null;
 205                                 err0616 = (err0616 != null)
 206                                         ? "Neither '" + Name + "' nor '" + NameAttribute +"' is an attribute class"
 207                                         : "'" + Name + "Attribute': is not an attribute class";
 208                         }
 209
 210                         if (t1 != null && t2 != null) {
 211                                 Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
 212                                              + " use either '@" + Name + "' or '" + NameAttribute + "'");
 213                                 return null;
 214                         }
 215                         if (t1 != null)
 216                                 return t1;
 217                         if (t2 != null)
 218                                 return t2;
 219                         if (err0616 != null) {
 220                                 Report.Error (616, Location, err0616);
 221                                 return null;
 222                         }
 223
 224                         Report.Error (246, Location,
 225                                       "Could not find attribute '" + Name
 226                                       + "' (are you missing a using directive or an assembly reference ?)");
 227
 228                         resolve_error = true;
 229                         return null;
 230                 }
 231
 232                 public virtual Type ResolveType (EmitContext ec)
 233                 {
 234                         if (Type == null && !resolve_error)
 235                                 Type = CheckAttributeType (ec);
 236                         return Type;
 237                 }
 238
 239                 string GetFullMemberName (string member)
 240                 {
 241                         return Type.FullName + '.' + member;
 242                 }
 243
 244                 //
 245                 // Given an expression, if the expression is a valid attribute-argument-expression
 246                 // returns an object that can be used to encode it, or null on failure.
 247                 //
 248                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, Type arg_type, out object result)
 249                 {
 250                         if (e is EnumConstant) {
 251                                 if (RootContext.StdLib)
 252                                         result = ((EnumConstant)e).GetValueAsEnumType ();
 253                                 else
 254                                         result = ((EnumConstant)e).GetValue ();
 255
 256                                 return true;
 257                         }
 258
 259                         Constant constant = e as Constant;
 260                         if (constant != null) {
 261                                 if (e.Type != arg_type) {
 262                                         constant = Const.ChangeType (loc, constant, arg_type);
 263                                         if (constant == null) {
 264                                                 result = null;
 265                                                 Error_AttributeArgumentNotValid (loc);
 266                                                 return false;
 267                                         }
 268                                 }
 269                                 result = constant.GetValue ();
 270                                 return true;
 271                         } else if (e is TypeOf) {
 272                                 result = ((TypeOf) e).TypeArg;
 273                                 return true;
 274                         } else if (e is ArrayCreation){
 275                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 276                                 if (result != null)
 277                                         return true;
 278                         } else if (e is EmptyCast) {
 279                                 Expression child = ((EmptyCast)e).Child;
 280                                 return GetAttributeArgumentExpression (child, loc, child.Type, out result);
 281                         }
 282
 283                         result = null;
 284                         Error_AttributeArgumentNotValid (loc);
 285                         return false;
 286                 }
 287
 288                 // Cache for parameter-less attributes
 289                 static PtrHashtable att_cache = new PtrHashtable ();
 290
 291                 public virtual CustomAttributeBuilder Resolve (EmitContext ec)
 292                 {
 293                         if (resolve_error)
 294                                 return null;
 295
 296                         resolve_error = true;
 297
 298                         if (Type == null)
 299                                 Type = CheckAttributeType (ec);
 300
 301                         if (Type == null)
 302                                 return null;
 303
 304                         if (Type.IsAbstract) {
 305                                 Report.Error (653, Location, "Cannot apply attribute class '{0}' because it is abstract", Name);
 306                                 return null;
 307                         }
 308
 309                         if (Arguments == null) {
 310                                 object o = att_cache [Type];
 311                                 if (o != null) {
 312                                         resolve_error = false;
 313                                         return (CustomAttributeBuilder)o;
 314                                 }
 315                         }
 316
 317                         // Now we extract the positional and named arguments
 318
 319                         ArrayList pos_args = new ArrayList ();
 320                         ArrayList named_args = new ArrayList ();
 321                         int pos_arg_count = 0;
 322
 323                         if (Arguments != null) {
 324                                 pos_args = (ArrayList) Arguments [0];
 325                                 if (pos_args != null)
 326                                         pos_arg_count = pos_args.Count;
 327                                 if (Arguments.Count > 1)
 328                                         named_args = (ArrayList) Arguments [1];
 329                         }
 330
 331                         pos_values = new object [pos_arg_count];
 332
 333                         //
 334                         // First process positional arguments
 335                         //
 336
 337                         int i;
 338                         for (i = 0; i < pos_arg_count; i++) {
 339                                 Argument a = (Argument) pos_args [i];
 340                                 Expression e;
 341
 342                                 if (!a.Resolve (ec, Location))
 343                                         return null;
 344
 345                                 e = a.Expr;
 346
 347                                 object val;
 348                                 if (!GetAttributeArgumentExpression (e, Location, a.Type, out val))
 349                                         return null;
 350
 351                                 pos_values [i] = val;
 352
 353                                 if (i == 0 && Type == TypeManager.attribute_usage_type && (int)val == 0) {
 354                                         Report.Error (591, Location, "Invalid value for argument to 'System.AttributeUsage' attribute");
 355                                         return null;
 356                                 }
 357                         }
 358
 359                         //
 360                         // Now process named arguments
 361                         //
 362
 363                         ArrayList field_infos = null;
 364                         ArrayList prop_infos  = null;
 365                         ArrayList field_values = null;
 366                         ArrayList prop_values = null;
 367
 368                         if (named_args.Count > 0) {
 369                                 field_infos = new ArrayList ();
 370                                 prop_infos  = new ArrayList ();
 371                                 field_values = new ArrayList ();
 372                                 prop_values = new ArrayList ();
 373                         }
 374
 375                         Hashtable seen_names = new Hashtable();
 376
 377                         for (i = 0; i < named_args.Count; i++) {
 378                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 379                                 string member_name = (string) de.Key;
 380                                 Argument a  = (Argument) de.Value;
 381                                 Expression e;
 382
 383                                 if (seen_names.Contains(member_name)) {
 384                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 385                                         return null;
 386                                 }
 387                                 seen_names.Add(member_name, 1);
 388
 389                                 if (!a.Resolve (ec, Location))
 390                                         return null;
 391
 392                                 Expression member = Expression.MemberLookup (
 393                                         ec, Type, member_name,
 394                                         MemberTypes.Field | MemberTypes.Property,
 395                                         BindingFlags.Public | BindingFlags.Instance,
 396                                         Location);
 397
 398                                 if (member == null) {
 399                                         member = Expression.MemberLookup (ec, Type, member_name,
 400                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 401                                                 Location);
 402
 403                                         if (member != null) {
 404                                                 Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", GetFullMemberName (member_name));
 405                                                 return null;
 406                                         }
 407                                 }
 408
 409                                 if (member == null){
 410                                         Report.Error (117, Location, "Attribute `{0}' does not contain a definition for `{1}'",
 411                                                       Type, member_name);
 412                                         return null;
 413                                 }
 414
 415                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 416                                         Error_InvalidNamedArgument (member_name);
 417                                         return null;
 418                                 }
 419
 420                                 e = a.Expr;
 421                                 if (e is TypeParameterExpr){
 422                                         Error_TypeParameterInAttribute (Location);
 423                                         return null;
 424                                 }
 425
 426                                 if (member is PropertyExpr) {
 427                                         PropertyExpr pe = (PropertyExpr) member;
 428                                         PropertyInfo pi = pe.PropertyInfo;
 429
 430                                         if (!pi.CanWrite || !pi.CanRead) {
 431                                                 Report.SymbolRelatedToPreviousError (pi);
 432                                                 Error_InvalidNamedArgument (member_name);
 433                                                 return null;
 434                                         }
 435
 436                                         object value;
 437                                         if (!GetAttributeArgumentExpression (e, Location, pi.PropertyType, out value))
 438                                                 return null;
 439
 440                                         prop_values.Add (value);
 441                                         prop_infos.Add (pi);
 442
 443                                 } else if (member is FieldExpr) {
 444                                         FieldExpr fe = (FieldExpr) member;
 445                                         FieldInfo fi = fe.FieldInfo;
 446
 447                                         if (fi.IsInitOnly) {
 448                                                 Error_InvalidNamedArgument (member_name);
 449                                                 return null;
 450                                         }
 451
 452                                         object value;
 453                                         if (!GetAttributeArgumentExpression (e, Location, fi.FieldType, out value))
 454                                                 return null;
 455
 456                                         field_values.Add (value);
 457
 458                                         field_infos.Add (fi);
 459                                 }
 460                         }
 461
 462                         Expression mg = Expression.MemberLookup (
 463                                 ec, Type, ".ctor", MemberTypes.Constructor,
 464                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 465                                 Location);
 466
 467                         if (mg == null) {
 468                                 Error_AttributeConstructorMismatch ();
 469                                 return null;
 470                         }
 471
 472                         MethodBase constructor = Invocation.OverloadResolve (
 473                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 474
 475                         if (constructor == null) {
 476                                 return null;
 477                         }
 478
 479                         //
 480                         // Now we perform some checks on the positional args as they
 481                         // cannot be null for a constructor which expects a parameter
 482                         // of type object
 483                         //
 484
 485                         ParameterData pd = TypeManager.GetParameterData (constructor);
 486
 487                         int last_real_param = pd.Count;
 488                         if (pd.HasParams) {
 489                                 // When the params is not filled we need to put one
 490                                 if (last_real_param > pos_arg_count) {
 491                                         object [] new_pos_values = new object [pos_arg_count + 1];
 492                                         pos_values.CopyTo (new_pos_values, 0);
 493                                         new_pos_values [pos_arg_count] = new object [] {} ;
 494                                         pos_values = new_pos_values;
 495                                 }
 496                                 last_real_param--;
 497                         }
 498
 499                         for (int j = 0; j < pos_arg_count; ++j) {
 500                                 Argument a = (Argument) pos_args [j];
 501
 502                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 503                                         Error_AttributeArgumentNotValid (Location);
 504                                         return null;
 505                                 }
 506
 507                                 object value = pos_values [j];
 508                                 if (value != null && a.Type != value.GetType () && a.Type.IsPrimitive) {
 509                                         bool fail;
 510                                         pos_values [j] = TypeManager.ChangeType (value, a.Type, out fail);
 511                                         if (fail) {
 512                                                 // TODO: Can failed ?
 513                                                 throw new NotImplementedException ();
 514                                         }
 515                                 }
 516
 517                                 if (j < last_real_param)
 518                                         continue;
 519
 520                                 if (j == last_real_param) {
 521                                         object [] array = new object [pos_arg_count - last_real_param];
 522                                         array [0] = pos_values [j];
 523                                         pos_values [j] = array;
 524                                         continue;
 525                                 }
 526
 527                                 object [] params_array = (object []) pos_values [last_real_param];
 528                                 params_array [j - last_real_param] = pos_values [j];
 529                         }
 530
 531                         // Adjust the size of the pos_values if it had params
 532                         if (last_real_param != pos_arg_count) {
 533                                 object [] new_pos_values = new object [last_real_param + 1];
 534                                 Array.Copy (pos_values, new_pos_values, last_real_param + 1);
 535                                 pos_values = new_pos_values;
 536                         }
 537
 538                         try {
 539                                 if (named_args.Count > 0) {
 540                                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 541                                         field_info_arr = new FieldInfo [field_infos.Count];
 542                                         field_values_arr = new object [field_values.Count];
 543                                         prop_values_arr = new object [prop_values.Count];
 544
 545                                         field_infos.CopyTo  (field_info_arr, 0);
 546                                         field_values.CopyTo (field_values_arr, 0);
 547
 548                                         prop_values.CopyTo  (prop_values_arr, 0);
 549                                         prop_infos.CopyTo   (prop_info_arr, 0);
 550
 551                                         cb = new CustomAttributeBuilder (
 552                                                 (ConstructorInfo) constructor, pos_values,
 553                                                 prop_info_arr, prop_values_arr,
 554                                                 field_info_arr, field_values_arr);
 555                                 }
 556                                 else {
 557                                         cb = new CustomAttributeBuilder (
 558                                                 (ConstructorInfo) constructor, pos_values);
 559
 560                                         if (pos_values.Length == 0)
 561                                                 att_cache.Add (Type, cb);
 562                                 }
 563                         } catch (Exception) {
 564                                 //
 565                                 // Sample:
 566                                 // using System.ComponentModel;
 567                                 // [DefaultValue (CollectionChangeAction.Add)]
 568                                 // class X { static void Main () {} }
 569                                 //
 570                                 Error_AttributeArgumentNotValid (Location);
 571                                 return null;
 572                         }
 573
 574                         resolve_error = false;
 575                         return cb;
 576                 }
 577
 578                 /// <summary>
 579                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 580                 /// </summary>
 581                 public string GetValidTargets ()
 582                 {
 583                         StringBuilder sb = new StringBuilder ();
 584                         AttributeTargets targets = GetAttributeUsage (null).ValidOn;
 585
 586                         if ((targets & AttributeTargets.Assembly) != 0)
 587                                 sb.Append ("'assembly' ");
 588
 589                         if ((targets & AttributeTargets.Class) != 0)
 590                                 sb.Append ("'class' ");
 591
 592                         if ((targets & AttributeTargets.Constructor) != 0)
 593                                 sb.Append ("'constructor' ");
 594
 595                         if ((targets & AttributeTargets.Delegate) != 0)
 596                                 sb.Append ("'delegate' ");
 597
 598                         if ((targets & AttributeTargets.Enum) != 0)
 599                                 sb.Append ("'enum' ");
 600
 601                         if ((targets & AttributeTargets.Event) != 0)
 602                                 sb.Append ("'event' ");
 603
 604                         if ((targets & AttributeTargets.Field) != 0)
 605                                 sb.Append ("'field' ");
 606
 607                         if ((targets & AttributeTargets.Interface) != 0)
 608                                 sb.Append ("'interface' ");
 609
 610                         if ((targets & AttributeTargets.Method) != 0)
 611                                 sb.Append ("'method' ");
 612
 613                         if ((targets & AttributeTargets.Module) != 0)
 614                                 sb.Append ("'module' ");
 615
 616                         if ((targets & AttributeTargets.Parameter) != 0)
 617                                 sb.Append ("'parameter' ");
 618
 619                         if ((targets & AttributeTargets.Property) != 0)
 620                                 sb.Append ("'property' ");
 621
 622                         if ((targets & AttributeTargets.ReturnValue) != 0)
 623                                 sb.Append ("'return' ");
 624
 625                         if ((targets & AttributeTargets.Struct) != 0)
 626                                 sb.Append ("'struct' ");
 627
 628                         return sb.ToString ();
 629
 630                 }
 631
 632                 /// <summary>
 633                 /// Returns AttributeUsage attribute for this type
 634                 /// </summary>
 635                 AttributeUsageAttribute GetAttributeUsage (EmitContext ec)
 636                 {
 637                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 638                         if (ua != null)
 639                                 return ua;
 640
 641                         Class attr_class = TypeManager.LookupClass (Type);
 642
 643                         if (attr_class == null) {
 644                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 645                                 ua = (AttributeUsageAttribute)usage_attr [0];
 646                                 usage_attr_cache.Add (Type, ua);
 647                                 return ua;
 648                         }
 649
 650                         if (attr_class.OptAttributes == null) {
 651                                 usage_attr_cache.Add (Type, DefaultUsageAttribute);
 652                                 return DefaultUsageAttribute;
 653                         }
 654
 655                         Attribute a = attr_class.OptAttributes.Search (TypeManager.attribute_usage_type, ec);
 656                         if (a == null) {
 657                                 usage_attr_cache.Add (Type, DefaultUsageAttribute);
 658                                 return DefaultUsageAttribute;
 659                         }
 660
 661                         ua = a.GetAttributeUsageAttribute (ec);
 662                         usage_attr_cache.Add (Type, ua);
 663                         return ua;
 664                 }
 665
 666                 AttributeUsageAttribute GetAttributeUsageAttribute (EmitContext ec)
 667                 {
 668                         if (pos_values == null)
 669                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 670                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 671                                 Resolve (ec);
 672
 673                         if (resolve_error)
 674                                 return DefaultUsageAttribute;
 675
 676                         AttributeUsageAttribute usage_attribute = new AttributeUsageAttribute ((AttributeTargets)pos_values [0]);
 677
 678                         object field = GetPropertyValue ("AllowMultiple");
 679                         if (field != null)
 680                                 usage_attribute.AllowMultiple = (bool)field;
 681
 682                         field = GetPropertyValue ("Inherited");
 683                         if (field != null)
 684                                 usage_attribute.Inherited = (bool)field;
 685
 686                         return usage_attribute;
 687                 }
 688
 689                 /// <summary>
 690                 /// Returns custom name of indexer
 691                 /// </summary>
 692                 public string GetIndexerAttributeValue (EmitContext ec)
 693                 {
 694                         if (pos_values == null)
 695                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 696                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 697                                 Resolve (ec);
 698
 699                         if (resolve_error)
 700                                 return null;
 701
 702                         return pos_values [0] as string;
 703                 }
 704
 705                 /// <summary>
 706                 /// Returns condition of ConditionalAttribute
 707                 /// </summary>
 708                 public string GetConditionalAttributeValue (EmitContext ec)
 709                 {
 710                         if (pos_values == null)
 711                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 712                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 713                                 Resolve (ec);
 714
 715                         if (resolve_error)
 716                                 return null;
 717
 718                         return (string)pos_values [0];
 719                 }
 720
 721                 /// <summary>
 722                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 723                 /// </summary>
 724                 public ObsoleteAttribute GetObsoleteAttribute (EmitContext ec)
 725                 {
 726                         if (pos_values == null)
 727                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 728                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 729                                 Resolve (ec);
 730
 731                         if (resolve_error)
 732                                 return null;
 733
 734                         if (pos_values == null || pos_values.Length == 0)
 735                                 return new ObsoleteAttribute ();
 736
 737                         if (pos_values.Length == 1)
 738                                 return new ObsoleteAttribute ((string)pos_values [0]);
 739
 740                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 741                 }
 742
 743                 /// <summary>
 744                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 745                 /// before ApplyAttribute. We need to resolve the arguments.
 746                 /// This situation occurs when class deps is differs from Emit order.
 747                 /// </summary>
 748                 public bool GetClsCompliantAttributeValue (EmitContext ec)
 749                 {
 750                         if (pos_values == null)
 751                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 752                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 753                                 Resolve (ec);
 754
 755                         if (resolve_error)
 756                                 return false;
 757
 758                         return (bool)pos_values [0];
 759                 }
 760
 761                 /// <summary>
 762                 /// Tests permitted SecurityAction for assembly or other types
 763                 /// </summary>
 764                 public bool CheckSecurityActionValidity (bool for_assembly)
 765                 {
 766                         SecurityAction action  = GetSecurityActionValue ();
 767
 768                         if ((action == SecurityAction.RequestMinimum || action == SecurityAction.RequestOptional || action == SecurityAction.RequestRefuse) && for_assembly)
 769                                 return true;
 770
 771                         if (!for_assembly) {
 772                                 if (action < SecurityAction.Demand || action > SecurityAction.InheritanceDemand) {
 773                                         Error_AttributeEmitError ("SecurityAction is out of range");
 774                                         return false;
 775                                 }
 776
 777                                 if ((action != SecurityAction.RequestMinimum && action != SecurityAction.RequestOptional && action != SecurityAction.RequestRefuse) && !for_assembly)
 778                                         return true;
 779                         }
 780
 781                         Error_AttributeEmitError (String.Concat ("SecurityAction '", action, "' is not valid for this declaration"));
 782                         return false;
 783                 }
 784
 785                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 786                 {
 787                         return (SecurityAction)pos_values [0];
 788                 }
 789
 790                 /// <summary>
 791                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 792                 /// </summary>
 793                 /// <returns></returns>
 794                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 795                 {
 796                         if (TypeManager.LookupDeclSpace (Type) != null && RootContext.StdLib) {
 797                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 798                                 return;
 799                         }
 800
 801                         SecurityAttribute sa;
 802                         // For all assemblies except corlib we can avoid all hacks
 803                         if (RootContext.StdLib) {
 804                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 805
 806                                 if (prop_info_arr != null) {
 807                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 808                                                 PropertyInfo pi = prop_info_arr [i];
 809                                                 pi.SetValue (sa, prop_values_arr [i], null);
 810                                         }
 811                                 }
 812                         } else {
 813                                 Type temp_type = Type.GetType (Type.FullName);
 814                                 // HACK: All mscorlib attributes have same ctor syntax
 815                                 sa = (SecurityAttribute) Activator.CreateInstance (temp_type, new object[] { GetSecurityActionValue () } );
 816
 817                                 // All types are from newly created corlib but for invocation with old we need to convert them
 818                                 if (prop_info_arr != null) {
 819                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 820                                                 PropertyInfo emited_pi = prop_info_arr [i];
 821                                                 PropertyInfo pi = temp_type.GetProperty (emited_pi.Name, emited_pi.PropertyType);
 822
 823                                                 object old_instance = pi.PropertyType.IsEnum ?
 824                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
 825                                                         prop_values_arr [i];
 826
 827                                                 pi.SetValue (sa, old_instance, null);
 828                                         }
 829                                 }
 830                         }
 831
 832                         IPermission perm;
 833                         perm = sa.CreatePermission ();
 834                         SecurityAction action = GetSecurityActionValue ();
 835
 836                         // IS is correct because for corlib we are using an instance from old corlib
 837                         if (!(perm is System.Security.CodeAccessPermission)) {
 838                                 switch (action) {
 839                                         case SecurityAction.Demand:
 840                                                 action = (SecurityAction)13;
 841                                                 break;
 842                                         case SecurityAction.LinkDemand:
 843                                                 action = (SecurityAction)14;
 844                                                 break;
 845                                         case SecurityAction.InheritanceDemand:
 846                                                 action = (SecurityAction)15;
 847                                                 break;
 848                                 }
 849                         }
 850
 851                         PermissionSet ps = (PermissionSet)permissions [action];
 852                         if (ps == null) {
 853                                 if (sa is PermissionSetAttribute)
 854                                         ps = new PermissionSet (sa.Unrestricted ? PermissionState.Unrestricted : PermissionState.None);
 855                                 else
 856                                         ps = new PermissionSet (PermissionState.None);
 857
 858                                 permissions.Add (action, ps);
 859                         } else if (!ps.IsUnrestricted () && sa.Unrestricted) {
 860                                 ps = ps.Union (new PermissionSet (PermissionState.Unrestricted));
 861                                 permissions [action] = ps;
 862                         }
 863                         ps.AddPermission (perm);
 864                 }
 865
 866                 object GetValue (object value)
 867                 {
 868                         if (value is EnumConstant)
 869                                 return ((EnumConstant) value).GetValue ();
 870                         else
 871                                 return value;
 872                 }
 873
 874                 object GetPropertyValue (string name)
 875                 {
 876                         if (prop_info_arr == null)
 877                                 return null;
 878
 879                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 880                                 if (prop_info_arr [i].Name == name)
 881                                         return prop_values_arr [i];
 882                         }
 883
 884                         return null;
 885                 }
 886
 887                 object GetFieldValue (string name)
 888                 {
 889                         int i;
 890                         if (field_info_arr == null)
 891                                 return null;
 892                         i = 0;
 893                         foreach (FieldInfo fi in field_info_arr) {
 894                                 if (fi.Name == name)
 895                                         return GetValue (field_values_arr [i]);
 896                                 i++;
 897                         }
 898                         return null;
 899                 }
 900
 901                 public UnmanagedMarshal GetMarshal (Attributable attr)
 902                 {
 903                         UnmanagedType UnmanagedType = (UnmanagedType)System.Enum.Parse (typeof (UnmanagedType), pos_values [0].ToString ());
 904
 905                         object value = GetFieldValue ("SizeParamIndex");
 906                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
 907                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
 908                                 return null;
 909                         }
 910
 911                         object o = GetFieldValue ("ArraySubType");
 912                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 913
 914                         switch (UnmanagedType) {
 915                         case UnmanagedType.CustomMarshaler: {
 916                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 917                                                                        BindingFlags.Static | BindingFlags.Public);
 918                                 if (define_custom == null) {
 919                                         Report.RuntimeMissingSupport (Location, "set marshal info");
 920                                         return null;
 921                                 }
 922
 923                                 object [] args = new object [4];
 924                                 args [0] = GetFieldValue ("MarshalTypeRef");
 925                                 args [1] = GetFieldValue ("MarshalCookie");
 926                                 args [2] = GetFieldValue ("MarshalType");
 927                                 args [3] = Guid.Empty;
 928                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 929                         }
 930                         case UnmanagedType.LPArray: {
 931                                 object size_const = GetFieldValue ("SizeConst");
 932                                 object size_param_index = GetFieldValue ("SizeParamIndex");
 933
 934                                 if ((size_const != null) || (size_param_index != null)) {
 935                                         MethodInfo define_array = typeof (UnmanagedMarshal).GetMethod ("DefineLPArrayInternal", BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
 936                                         if (define_array == null) {
 937                                                 Report.RuntimeMissingSupport (Location, "set marshal info");
 938                                                 return null;
 939                                         }
 940
 941                                         object [] args = new object [3];
 942                                         args [0] = array_sub_type;
 943                                         args [1] = size_const;
 944                                         args [2] = size_param_index;
 945                                         return (UnmanagedMarshal) define_array.Invoke (null, args);
 946                                 }
 947                                 else
 948                                         return UnmanagedMarshal.DefineLPArray (array_sub_type);
 949                         }
 950                         case UnmanagedType.SafeArray:
 951                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 952
 953                         case UnmanagedType.ByValArray:
 954                                 FieldMember fm = attr as FieldMember;
 955                                 if (fm == null) {
 956                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
 957                                         return null;
 958                                 }
 959                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 960
 961                         case UnmanagedType.ByValTStr:
 962                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 963
 964                         default:
 965                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 966                         }
 967                 }
 968
 969                 public MethodImplOptions GetMethodImplOptions ()
 970                 {
 971                         return (MethodImplOptions)System.Enum.Parse (typeof (MethodImplOptions), pos_values [0].ToString ());
 972                 }
 973
 974                 public LayoutKind GetLayoutKindValue ()
 975                 {
 976                         return (LayoutKind)System.Enum.Parse (typeof (LayoutKind), pos_values [0].ToString ());
 977                 }
 978
 979                 /// <summary>
 980                 /// Emit attribute for Attributable symbol
 981                 /// </summary>
 982                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 983                 {
 984                         CustomAttributeBuilder cb = Resolve (ec);
 985                         if (cb == null)
 986                                 return;
 987
 988                         AttributeUsageAttribute usage_attr = GetAttributeUsage (ec);
 989                         if ((usage_attr.ValidOn & Target) == 0) {
 990                                 Report.Error (592, Location, "Attribute '{0}' is not valid on this declaration type. It is valid on {1} declarations only.", Name, GetValidTargets ());
 991                                 return;
 992                         }
 993
 994                         try {
 995                                 ias.ApplyAttributeBuilder (this, cb);
 996                         }
 997                         catch (Exception e) {
 998                                 Error_AttributeEmitError (e.Message);
 999                                 return;
1000                         }
1001
1002                         if (!usage_attr.AllowMultiple) {
1003                                 ArrayList emitted_targets = (ArrayList)emitted_attr [Type];
1004                                 if (emitted_targets == null) {
1005                                         emitted_targets = new ArrayList ();
1006                                         emitted_attr.Add (Type, emitted_targets);
1007                                 } else if (emitted_targets.Contains (Target)) {
1008                                 Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
1009                                         return;
1010                                 }
1011                                 emitted_targets.Add (Target);
1012                         }
1013
1014                         if (!RootContext.VerifyClsCompliance)
1015                                 return;
1016
1017                         // Here we are testing attribute arguments for array usage (error 3016)
1018                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
1019                                 if (Arguments == null)
1020                                         return;
1021
1022                                 ArrayList pos_args = (ArrayList) Arguments [0];
1023                                 if (pos_args != null) {
1024                                         foreach (Argument arg in pos_args) {
1025                                                 // Type is undefined (was error 246)
1026                                                 if (arg.Type == null)
1027                                                         return;
1028
1029                                                 if (arg.Type.IsArray) {
1030                                                         Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
1031                                                         return;
1032                                                 }
1033                                         }
1034                                 }
1035
1036                                 if (Arguments.Count < 2)
1037                                         return;
1038
1039                                 ArrayList named_args = (ArrayList) Arguments [1];
1040                                 foreach (DictionaryEntry de in named_args) {
1041                                         Argument arg  = (Argument) de.Value;
1042
1043                                         // Type is undefined (was error 246)
1044                                         if (arg.Type == null)
1045                                                 return;
1046
1047                                         if (arg.Type.IsArray) {
1048                                                 Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
1049                                                 return;
1050                                         }
1051                                 }
1052                         }
1053                 }
1054
1055                 object GetValue (EmitContext ec, Constant c, Type target)
1056                 {
1057                         if (Convert.ImplicitConversionExists (ec, c, target))
1058                                 return c.GetValue ();
1059
1060                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
1061                         return null;
1062                 }
1063
1064                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
1065                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
1066                 {
1067                         if (pos_values == null)
1068                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
1069                                 // But because a lot of attribute class code must be rewritten will be better to wait...
1070                                 Resolve (ec);
1071
1072                         if (resolve_error)
1073                                 return null;
1074
1075                         string dll_name = (string)pos_values [0];
1076
1077                         // Default settings
1078                         CallingConvention cc = CallingConvention.Winapi;
1079                         CharSet charset = CharSet.Ansi;
1080                         bool preserve_sig = true;
1081                         string entry_point = name;
1082
1083                         if (field_info_arr != null) {
1084                                 int char_set_extra = 0;
1085
1086                                 for (int i = 0; i < field_info_arr.Length; i++) {
1087                                         switch (field_info_arr [i].Name) {
1088                                                 case "BestFitMapping":
1089                                                         throw new NotImplementedException ();
1090                                                 case "CallingConvention":
1091                                                         cc = (CallingConvention) field_values_arr [i];
1092                                                         break;
1093                                                 case "CharSet":
1094                                                         charset = (CharSet) field_values_arr [i];
1095                                                         break;
1096                                                 case "EntryPoint":
1097                                                         entry_point = (string) field_values_arr [i];
1098                                                         break;
1099                                                 case "ExactSpelling":
1100                                                         char_set_extra |= 0x01;
1101                                                         break;
1102                                                 case "PreserveSig":
1103                                                         preserve_sig = (bool) field_values_arr [i];
1104                                                         break;
1105                                                 case "SetLastError":
1106                                                         char_set_extra |= 0x40;
1107                                                         break;
1108                                                 case "ThrowOnUnmappableChar":
1109                                                         throw new NotImplementedException ();
1110                                                 default:
1111                                                         throw new InternalErrorException (field_info_arr [i].ToString ());
1112                                         }
1113                                 }
1114                                 charset |= (CharSet)char_set_extra;
1115                         }
1116
1117                         try {
1118                                 MethodBuilder mb = builder.DefinePInvokeMethod (
1119                                         name, dll_name, entry_point, flags | MethodAttributes.HideBySig | MethodAttributes.PinvokeImpl,
1120                                         CallingConventions.Standard, ret_type, param_types, cc, charset);
1121
1122                                 if (preserve_sig)
1123                                         mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
1124
1125                                 return mb;
1126                         }
1127                         catch (ArgumentException e) {
1128                                 Error_AttributeEmitError (e.Message);
1129                                 return null;
1130                         }
1131                 }
1132
1133                 private Expression GetValue ()
1134                 {
1135                         if ((Arguments == null) || (Arguments.Count < 1))
1136                                 return null;
1137                         ArrayList al = (ArrayList) Arguments [0];
1138                         if ((al == null) || (al.Count < 1))
1139                                 return null;
1140                         Argument arg = (Argument) al [0];
1141                         if ((arg == null) || (arg.Expr == null))
1142                                 return null;
1143                         return arg.Expr;
1144                 }
1145
1146                 public string GetString ()
1147                 {
1148                         Expression e = GetValue ();
1149                         if (e is StringLiteral)
1150                                 return (e as StringLiteral).Value;
1151                         return null;
1152                 }
1153
1154                 public bool GetBoolean ()
1155                 {
1156                         Expression e = GetValue ();
1157                         if (e is BoolLiteral)
1158                                 return (e as BoolLiteral).Value;
1159                         return false;
1160                 }
1161         }
1162
1163
1164         /// <summary>
1165         /// For global attributes (assembly, module) we need special handling.
1166         /// Attributes can be located in the several files
1167         /// </summary>
1168         public class GlobalAttribute: Attribute
1169         {
1170                 public readonly NamespaceEntry ns;
1171
1172                 public GlobalAttribute (TypeContainer container, string target,
1173                                         Expression left_expr, string identifier, ArrayList args, Location loc):
1174                         base (target, left_expr, identifier, args, loc)
1175                 {
1176                         ns = container.NamespaceEntry;
1177                 }
1178
1179                 void Enter ()
1180                 {
1181                         // RootContext.Tree.Types has a single NamespaceEntry which gets overwritten
1182                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1183                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1184                         // that the NamespaceEntry is right, just overwrite it.
1185                         //
1186                         // Precondition: RootContext.Tree.Types == null
1187
1188                         if (RootContext.Tree.Types.NamespaceEntry != null)
1189                                 throw new InternalErrorException (Location + " non-null NamespaceEntry");
1190
1191                         RootContext.Tree.Types.NamespaceEntry = ns;
1192                 }
1193
1194                 void Leave ()
1195                 {
1196                         RootContext.Tree.Types.NamespaceEntry = null;
1197                 }
1198
1199                 public override Type ResolveType (EmitContext ec)
1200                 {
1201                         Enter ();
1202                         Type retval = base.ResolveType (ec);
1203                         Leave ();
1204                         return retval;
1205                 }
1206
1207                 public override CustomAttributeBuilder Resolve (EmitContext ec)
1208                 {
1209                         Enter ();
1210                         CustomAttributeBuilder retval = base.Resolve (ec);
1211                         Leave ();
1212                         return retval;
1213                 }
1214         }
1215
1216         public class Attributes {
1217                 public ArrayList Attrs;
1218
1219                 public Attributes (Attribute a)
1220                 {
1221                         Attrs = new ArrayList ();
1222                         Attrs.Add (a);
1223                 }
1224
1225                 public Attributes (ArrayList attrs)
1226                 {
1227                         Attrs = attrs;
1228                 }
1229
1230                 public void AddAttributes (ArrayList attrs)
1231                 {
1232                         Attrs.AddRange (attrs);
1233                 }
1234
1235                 /// <summary>
1236                 /// Checks whether attribute target is valid for the current element
1237                 /// </summary>
1238                 public bool CheckTargets (Attributable member)
1239                 {
1240                         string[] valid_targets = member.ValidAttributeTargets;
1241                         foreach (Attribute a in Attrs) {
1242                                 if (a.ExplicitTarget == null || a.ExplicitTarget == valid_targets [0]) {
1243                                         a.Target = member.AttributeTargets;
1244                                         continue;
1245                                 }
1246
1247                                 // TODO: we can skip the first item
1248                                 if (((IList) valid_targets).Contains (a.ExplicitTarget)) {
1249                                         switch (a.ExplicitTarget) {
1250                                                 case "return": a.Target = AttributeTargets.ReturnValue; continue;
1251                                                 case "param": a.Target = AttributeTargets.Parameter; continue;
1252                                                 case "field": a.Target = AttributeTargets.Field; continue;
1253                                                 case "method": a.Target = AttributeTargets.Method; continue;
1254                                                 case "property": a.Target = AttributeTargets.Property; continue;
1255                                         }
1256                                         throw new InternalErrorException ("Unknown explicit target: " + a.ExplicitTarget);
1257                                 }
1258
1259                                 StringBuilder sb = new StringBuilder ();
1260                                 foreach (string s in valid_targets) {
1261                                         sb.Append (s);
1262                                         sb.Append (", ");
1263                                 }
1264                                 sb.Remove (sb.Length - 2, 2);
1265                                 Report.Error (657, a.Location, "'{0}' is not a valid attribute location for this declaration. Valid attribute locations for this declaration are '{1}'", a.ExplicitTarget, sb.ToString ());
1266                                 return false;
1267                         }
1268                         return true;
1269                 }
1270
1271                 public Attribute Search (Type t, EmitContext ec)
1272                 {
1273                         foreach (Attribute a in Attrs) {
1274                                 if (a.ResolveType (ec) == t)
1275                                         return a;
1276                         }
1277                         return null;
1278                 }
1279
1280                 /// <summary>
1281                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1282                 /// </summary>
1283                 public Attribute[] SearchMulti (Type t, EmitContext ec)
1284                 {
1285                         ArrayList ar = null;
1286
1287                         foreach (Attribute a in Attrs) {
1288                                 if (a.ResolveType (ec) == t) {
1289                                         if (ar == null)
1290                                                 ar = new ArrayList ();
1291                                         ar.Add (a);
1292                                 }
1293                         }
1294
1295                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1296                 }
1297
1298                 public void Emit (EmitContext ec, Attributable ias)
1299                 {
1300                         if (!CheckTargets (ias))
1301                                 return;
1302
1303                         ListDictionary ld = new ListDictionary ();
1304
1305                         foreach (Attribute a in Attrs)
1306                                 a.Emit (ec, ias, ld);
1307                 }
1308
1309                 public bool Contains (Type t, EmitContext ec)
1310                 {
1311                         return Search (t, ec) != null;
1312                 }
1313         }
1314
1315         /// <summary>
1316         /// Helper class for attribute verification routine.
1317         /// </summary>
1318         sealed class AttributeTester
1319         {
1320                 static PtrHashtable analyzed_types = new PtrHashtable ();
1321                 static PtrHashtable analyzed_types_obsolete = new PtrHashtable ();
1322                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1323                 static PtrHashtable analyzed_method_excluded = new PtrHashtable ();
1324                 static PtrHashtable fixed_buffer_cache = new PtrHashtable ();
1325
1326                 static object TRUE = new object ();
1327                 static object FALSE = new object ();
1328
1329                 private AttributeTester ()
1330                 {
1331                 }
1332
1333                 /// <summary>
1334                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1335                 /// It tests differing only in ref or out, or in array rank.
1336                 /// </summary>
1337                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1338                 {
1339                         if (types_a == null || types_b == null)
1340                                 return true;
1341
1342                         if (types_a.Length != types_b.Length)
1343                                 return true;
1344
1345                         for (int i = 0; i < types_b.Length; ++i) {
1346                                 Type aType = types_a [i];
1347                                 Type bType = types_b [i];
1348
1349                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1350                                         return false;
1351                                 }
1352
1353                                 Type aBaseType = aType;
1354                                 bool is_either_ref_or_out = false;
1355
1356                                 if (aType.IsByRef || aType.IsPointer) {
1357                                         aBaseType = aType.GetElementType ();
1358                                         is_either_ref_or_out = true;
1359                                 }
1360
1361                                 Type bBaseType = bType;
1362                                 if (bType.IsByRef || bType.IsPointer)
1363                                 {
1364                                         bBaseType = bType.GetElementType ();
1365                                         is_either_ref_or_out = !is_either_ref_or_out;
1366                                 }
1367
1368                                 if (aBaseType != bBaseType)
1369                                         continue;
1370
1371                                 if (is_either_ref_or_out)
1372                                         return false;
1373                         }
1374                         return true;
1375                 }
1376
1377                 /// <summary>
1378                 /// Goes through all parameters and test if they are CLS-Compliant.
1379                 /// </summary>
1380                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1381                 {
1382                         if (fixedParameters == null)
1383                                 return true;
1384
1385                         foreach (Parameter arg in fixedParameters) {
1386                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1387                                         Report.Error (3001, loc, "Argument type '{0}' is not CLS-compliant", arg.GetSignatureForError ());
1388                                         return false;
1389                                 }
1390                         }
1391                         return true;
1392                 }
1393
1394
1395                 /// <summary>
1396                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1397                 /// </summary>
1398                 public static bool IsClsCompliant (Type type)
1399                 {
1400                         if (type == null)
1401                                 return true;
1402
1403                         object type_compliance = analyzed_types[type];
1404                         if (type_compliance != null)
1405                                 return type_compliance == TRUE;
1406
1407                         if (type.IsPointer) {
1408                                 analyzed_types.Add (type, null);
1409                                 return false;
1410                         }
1411
1412                         bool result;
1413                         if (type.IsArray || type.IsByRef)       {
1414                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1415                         } else {
1416                                 result = AnalyzeTypeCompliance (type);
1417                         }
1418                         analyzed_types.Add (type, result ? TRUE : FALSE);
1419                         return result;
1420                 }
1421
1422                 /// <summary>
1423                 /// Returns IFixedBuffer implementation if field is fixed buffer else null.
1424                 /// </summary>
1425                 public static IFixedBuffer GetFixedBuffer (FieldInfo fi)
1426                 {
1427                         FieldBase fb = TypeManager.GetField (fi);
1428                         if (fb != null) {
1429                                 return fb as IFixedBuffer;
1430                         }
1431
1432                         object o = fixed_buffer_cache [fi];
1433                         if (o == null) {
1434                                 if (System.Attribute.GetCustomAttribute (fi, TypeManager.fixed_buffer_attr_type) == null) {
1435                                         fixed_buffer_cache.Add (fi, FALSE);
1436                                         return null;
1437                                 }
1438
1439                                 IFixedBuffer iff = new FixedFieldExternal (fi);
1440                                 fixed_buffer_cache.Add (fi, iff);
1441                                 return iff;
1442                         }
1443
1444                         if (o == FALSE)
1445                                 return null;
1446
1447                         return (IFixedBuffer)o;
1448                 }
1449
1450                 public static void VerifyModulesClsCompliance ()
1451                 {
1452                         Module[] modules = TypeManager.Modules;
1453                         if (modules == null)
1454                                 return;
1455
1456                         // The first module is generated assembly
1457                         for (int i = 1; i < modules.Length; ++i) {
1458                                 Module module = modules [i];
1459                                 if (!IsClsCompliant (module)) {
1460                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute to match the assembly", module.Name);
1461                                         return;
1462                                 }
1463                         }
1464                 }
1465
1466                 /// <summary>
1467                 /// Tests container name for CLS-Compliant name (differing only in case)
1468                 /// </summary>
1469                 public static void VerifyTopLevelNameClsCompliance ()
1470                 {
1471                         Hashtable locase_table = new Hashtable ();
1472
1473                         // Convert imported type names to lower case and ignore not cls compliant
1474                         foreach (DictionaryEntry de in TypeManager.all_imported_types) {
1475                                 Type t = (Type)de.Value;
1476                                 if (!AttributeTester.IsClsCompliant (t))
1477                                         continue;
1478
1479                                 locase_table.Add (((string)de.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture), t);
1480                         }
1481
1482                         foreach (DictionaryEntry de in RootContext.Tree.Decls) {
1483                                 DeclSpace decl = (DeclSpace)de.Value;
1484                                 if (!decl.IsClsCompliaceRequired (decl))
1485                                         continue;
1486
1487                                 string lcase = decl.Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1488                                 if (!locase_table.Contains (lcase)) {
1489                                         locase_table.Add (lcase, decl);
1490                                         continue;
1491                                 }
1492
1493                                 object conflict = locase_table [lcase];
1494                                 if (conflict is Type)
1495                                         Report.SymbolRelatedToPreviousError ((Type)conflict);
1496                                 else
1497                                         Report.SymbolRelatedToPreviousError ((MemberCore)conflict);
1498
1499                                 Report.Error (3005, decl.Location, "Identifier '{0}' differing only in case is not CLS-compliant", decl.GetSignatureForError ());
1500                         }
1501                 }
1502
1503                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1504                 {
1505                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1506                         if (CompliantAttribute.Length == 0)
1507                                 return false;
1508
1509                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1510                 }
1511
1512                 static bool AnalyzeTypeCompliance (Type type)
1513                 {
1514                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1515                         if (ds != null) {
1516                                 return ds.IsClsCompliaceRequired (ds.Parent);
1517                         }
1518
1519                         if (type.IsGenericParameter || type.IsGenericInstance)
1520                                 return false;
1521
1522                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1523                         if (CompliantAttribute.Length == 0)
1524                                 return IsClsCompliant (type.Assembly);
1525
1526                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1527                 }
1528
1529                 /// <summary>
1530                 /// Returns instance of ObsoleteAttribute when type is obsolete
1531                 /// </summary>
1532                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1533                 {
1534                         object type_obsolete = analyzed_types_obsolete [type];
1535                         if (type_obsolete == FALSE)
1536                                 return null;
1537
1538                         if (type_obsolete != null)
1539                                 return (ObsoleteAttribute)type_obsolete;
1540
1541                         ObsoleteAttribute result = null;
1542                         if (type.IsByRef || type.IsArray || type.IsPointer) {
1543                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1544                         } else if (type.IsGenericParameter || type.IsGenericInstance)
1545                                 return null;
1546                         else {
1547                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1548
1549                                 // Type is external, we can get attribute directly
1550                                 if (type_ds == null) {
1551                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1552                                         if (attribute.Length == 1)
1553                                                 result = (ObsoleteAttribute)attribute [0];
1554                                 } else {
1555                                         result = type_ds.GetObsoleteAttribute (type_ds);
1556                                 }
1557                         }
1558
1559                         analyzed_types_obsolete.Add (type, result == null ? FALSE : result);
1560                         return result;
1561                 }
1562
1563                 /// <summary>
1564                 /// Returns instance of ObsoleteAttribute when method is obsolete
1565                 /// </summary>
1566                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1567                 {
1568                         IMethodData mc = TypeManager.GetMethod (mb);
1569                         if (mc != null)
1570                                 return mc.GetObsoleteAttribute ();
1571
1572                         // compiler generated methods are not registered by AddMethod
1573                         if (mb.DeclaringType is TypeBuilder)
1574                                 return null;
1575
1576                         PropertyInfo pi = PropertyExpr.AccessorTable [mb] as PropertyInfo;
1577                         if (pi != null)
1578                                 return GetMemberObsoleteAttribute (pi);
1579
1580                         return GetMemberObsoleteAttribute (mb);
1581                 }
1582
1583                 /// <summary>
1584                 /// Returns instance of ObsoleteAttribute when member is obsolete
1585                 /// </summary>
1586                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1587                 {
1588                         object type_obsolete = analyzed_member_obsolete [mi];
1589                         if (type_obsolete == FALSE)
1590                                 return null;
1591
1592                         if (type_obsolete != null)
1593                                 return (ObsoleteAttribute)type_obsolete;
1594
1595                         if ((mi.DeclaringType is TypeBuilder) || mi.DeclaringType.IsGenericInstance)
1596                                 return null;
1597
1598                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1599                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1600                         return oa;
1601                 }
1602
1603                 /// <summary>
1604                 /// Common method for Obsolete error/warning reporting.
1605                 /// </summary>
1606                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1607                 {
1608                         if (oa.IsError) {
1609                                 Report.Error (619, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1610                                 return;
1611                         }
1612
1613                         if (oa.Message == null) {
1614                                 Report.Warning (612, loc, "'{0}' is obsolete", member);
1615                                 return;
1616                         }
1617                         if (RootContext.WarningLevel >= 2)
1618                                 Report.Warning (618, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1619                 }
1620
1621                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1622                 {
1623                         object excluded = analyzed_method_excluded [mb];
1624                         if (excluded != null)
1625                                 return excluded == TRUE ? true : false;
1626
1627                         if (mb.Mono_IsInflatedMethod)
1628                                 return false;
1629
1630                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true) as ConditionalAttribute[];
1631                         if (attrs.Length == 0) {
1632                                 analyzed_method_excluded.Add (mb, FALSE);
1633                                 return false;
1634                         }
1635
1636                         foreach (ConditionalAttribute a in attrs) {
1637                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1638                                         analyzed_method_excluded.Add (mb, FALSE);
1639                                         return false;
1640                                 }
1641                         }
1642                         analyzed_method_excluded.Add (mb, TRUE);
1643                         return true;
1644                 }
1645         }
1646 }