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                         if (attributes != null)
  40                                 attributes.CheckTargets (this);
  41                 }
  42
  43                 public Attributes OptAttributes
  44                 {
  45                         get {
  46                                 return attributes;
  47                         }
  48                         set {
  49                                 attributes = value;
  50                                 if (attributes != null)
  51                                         attributes.CheckTargets (this);
  52                         }
  53                 }
  54
  55                 /// <summary>
  56                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  57                 /// </summary>
  58                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb);
  59
  60                 /// <summary>
  61                 /// Returns one AttributeTarget for this element.
  62                 /// </summary>
  63                 public abstract AttributeTargets AttributeTargets { get; }
  64
  65                 public abstract bool IsClsCompliaceRequired (DeclSpace ds);
  66
  67                 /// <summary>
  68                 /// Gets list of valid attribute targets for explicit target declaration.
  69                 /// The first array item is default target. Don't break this rule.
  70                 /// </summary>
  71                 public abstract string[] ValidAttributeTargets { get; }
  72         };
  73
  74         public class Attribute {
  75                 public readonly string ExplicitTarget;
  76                 public AttributeTargets Target;
  77
  78                 public readonly string    Name;
  79                 public readonly ArrayList Arguments;
  80
  81                 public readonly Location Location;
  82
  83                 public Type Type;
  84
  85                 // Is non-null if type is AttributeUsageAttribute
  86                 AttributeUsageAttribute usage_attribute;
  87
  88                 public AttributeUsageAttribute UsageAttribute {
  89                         get {
  90                                 return usage_attribute;
  91                         }
  92                 }
  93
  94                 MethodImplOptions ImplOptions;
  95                 UnmanagedType     UnmanagedType;
  96                 CustomAttributeBuilder cb;
  97
  98                 // non-null if named args present after Resolve () is called
  99                 PropertyInfo [] prop_info_arr;
 100                 FieldInfo [] field_info_arr;
 101                 object [] field_values_arr;
 102                 object [] prop_values_arr;
 103                 object [] pos_values;
 104
 105                 static PtrHashtable usage_attr_cache = new PtrHashtable ();
 106
 107                 public Attribute (string target, string name, ArrayList args, Location loc)
 108                 {
 109                         Name = name;
 110                         Arguments = args;
 111                         Location = loc;
 112                         ExplicitTarget = target;
 113                 }
 114
 115                 void Error_InvalidNamedArgument (string name)
 116                 {
 117                         Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +
 118                                       "argument. Named attribute arguments must be fields which are not " +
 119                                       "readonly, static or const, or read-write properties which are not static.");
 120                 }
 121
 122                 static void Error_AttributeArgumentNotValid (Location loc)
 123                 {
 124                         Report.Error (182, loc,
 125                                       "An attribute argument must be a constant expression, typeof " +
 126                                       "expression or array creation expression");
 127                 }
 128
 129                 static void Error_TypeParameterInAttribute (Location loc)
 130                 {
 131                         Report.Error (
 132                                 -202, loc, "Can not use a type parameter in an attribute");
 133                 }
 134
 135                 /// <summary>
 136                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 137                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 138                 /// </summary>
 139                 public void Error_AttributeEmitError (string inner)
 140                 {
 141                         Report.Error (647, Location, "Error emitting '{0}' attribute because '{1}'", Name, inner);
 142                 }
 143
 144                 public void Error_InvalidSecurityParent ()
 145                 {
 146                         Error_AttributeEmitError ("it is attached to invalid parent");
 147                 }
 148
 149                 void Error_AttributeConstructorMismatch ()
 150                 {
 151                         Report.Error (-6, Location,
 152                                       "Could not find a constructor for this argument list.");
 153                 }
 154
 155                 /// <summary>
 156                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 157                 /// </summary>
 158                 protected virtual Type CheckAttributeType (EmitContext ec, bool complain)
 159                 {
 160                         TypeExpr t1 = RootContext.LookupType (ec.DeclSpace, Name, true, Location);
 161                         // FIXME: Shouldn't do this for quoted attributes: [@A]
 162                         TypeExpr t2 = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);
 163
 164                         String err0616 = null;
 165                         if (t1 != null && ! t1.IsAttribute) {
 166                                 t1 = null;
 167                                 err0616 = "'" + Name + "': is not an attribute class";
 168                         }
 169                         if (t2 != null && ! t2.IsAttribute) {
 170                                 t2 = null;
 171                                 err0616 = (err0616 != null)
 172                                         ? "Neither '" + Name + "' nor '" + Name + "Attribute' is an attribute class"
 173                                         : "'" + Name + "Attribute': is not an attribute class";
 174                         }
 175
 176                         if (t1 != null && t2 != null) {
 177                                 Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
 178                                              + " use either '@" + Name + "' or '" + Name + "Attribute'");
 179                                 return null;
 180                         }
 181                         if (t1 != null)
 182                                 return t1.ResolveType (ec);
 183                         if (t2 != null)
 184                                 return t2.ResolveType (ec);
 185                         if (err0616 != null) {
 186                                 Report.Error (616, Location, err0616);
 187                                 return null;
 188                         }
 189
 190                         if (complain)
 191                                 Report.Error (246, Location,
 192                                               "Could not find attribute '" + Name
 193                                               + "' (are you missing a using directive or an assembly reference ?)");
 194                         return null;
 195                 }
 196
 197                 public Type ResolveType (EmitContext ec, bool complain)
 198                 {
 199                         if (Type == null)
 200                                 Type = CheckAttributeType (ec, complain);
 201                         return Type;
 202                 }
 203
 204                 /// <summary>
 205                 ///   Validates the guid string
 206                 /// </summary>
 207                 bool ValidateGuid (string guid)
 208                 {
 209                         try {
 210                                 new Guid (guid);
 211                                 return true;
 212                         } catch {
 213                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);
 214                                 return false;
 215                         }
 216                 }
 217
 218                 string GetFullMemberName (string member)
 219                 {
 220                         return Type.FullName + '.' + member;
 221                 }
 222
 223                 //
 224                 // Given an expression, if the expression is a valid attribute-argument-expression
 225                 // returns an object that can be used to encode it, or null on failure.
 226                 //
 227                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, Type arg_type, out object result)
 228                 {
 229                         if (e is EnumConstant) {
 230                                 if (RootContext.StdLib)
 231                                         result = ((EnumConstant)e).GetValueAsEnumType ();
 232                                 else
 233                                         result = ((EnumConstant)e).GetValue ();
 234
 235                                 return true;
 236                         }
 237
 238                         Constant constant = e as Constant;
 239                         if (constant != null) {
 240                                 if (e.Type != arg_type) {
 241                                         constant = Const.ChangeType (loc, constant, arg_type);
 242                                         if (constant == null) {
 243                                                 result = null;
 244                                                 Error_AttributeArgumentNotValid (loc);
 245                                                 return false;
 246                                         }
 247                                 }
 248                                 result = constant.GetValue ();
 249                                 return true;
 250                         } else if (e is TypeOf) {
 251                                 result = ((TypeOf) e).TypeArg;
 252                                 return true;
 253                         } else if (e is ArrayCreation){
 254                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 255                                 if (result != null)
 256                                         return true;
 257                         } else if (e is EmptyCast) {
 258                                 Expression child = ((EmptyCast)e).Child;
 259                                 return GetAttributeArgumentExpression (child, loc, child.Type, out result);
 260                         }
 261
 262                         result = null;
 263                         Error_AttributeArgumentNotValid (loc);
 264                         return false;
 265                 }
 266
 267                 public CustomAttributeBuilder Resolve (EmitContext ec)
 268                 {
 269                         Type oldType = Type;
 270
 271                         // Sanity check.
 272                         Type = CheckAttributeType (ec, true);
 273
 274                         if (oldType == null && Type == null)
 275                                 return null;
 276                         if (oldType != null && oldType != Type){
 277                                 Report.Error (-27, Location,
 278                                               "Attribute {0} resolved to different types at different times: {1} vs. {2}",
 279                                               Name, oldType, Type);
 280                                 return null;
 281                         }
 282
 283                         if (Type.IsAbstract) {
 284                                 Report.Error (653, Location, "Cannot apply attribute class '{0}' because it is abstract", Name);
 285                                 return null;
 286                         }
 287
 288                         bool MethodImplAttr = false;
 289                         bool MarshalAsAttr = false;
 290                         bool GuidAttr = false;
 291                         bool usage_attr = false;
 292
 293                         bool DoCompares = true;
 294
 295                         //
 296                         // If we are a certain special attribute, we
 297                         // set the information accordingly
 298                         //
 299
 300                         if (Type == TypeManager.attribute_usage_type)
 301                                 usage_attr = true;
 302                         else if (Type == TypeManager.methodimpl_attr_type)
 303                                 MethodImplAttr = true;
 304                         else if (Type == TypeManager.marshal_as_attr_type)
 305                                 MarshalAsAttr = true;
 306                         else if (Type == TypeManager.guid_attr_type)
 307                                 GuidAttr = true;
 308                         else
 309                                 DoCompares = false;
 310
 311                         // Now we extract the positional and named arguments
 312
 313                         ArrayList pos_args = new ArrayList ();
 314                         ArrayList named_args = new ArrayList ();
 315                         int pos_arg_count = 0;
 316
 317                         if (Arguments != null) {
 318                                 pos_args = (ArrayList) Arguments [0];
 319                                 if (pos_args != null)
 320                                         pos_arg_count = pos_args.Count;
 321                                 if (Arguments.Count > 1)
 322                                         named_args = (ArrayList) Arguments [1];
 323                         }
 324
 325                         pos_values = new object [pos_arg_count];
 326
 327                         //
 328                         // First process positional arguments
 329                         //
 330
 331                         int i;
 332                         for (i = 0; i < pos_arg_count; i++) {
 333                                 Argument a = (Argument) pos_args [i];
 334                                 Expression e;
 335
 336                                 if (!a.Resolve (ec, Location))
 337                                         return null;
 338
 339                                 e = a.Expr;
 340
 341                                 object val;
 342                                 if (!GetAttributeArgumentExpression (e, Location, a.Type, out val))
 343                                         return null;
 344
 345                                 pos_values [i] = val;
 346
 347                                 if (DoCompares){
 348                                         if (usage_attr) {
 349                                                 usage_attribute = new AttributeUsageAttribute ((AttributeTargets)val);
 350                                         } else if (MethodImplAttr) {
 351                                                 this.ImplOptions = (MethodImplOptions) val;
 352                                         } else if (GuidAttr){
 353                                                 //
 354                                                 // we will later check the validity of the type
 355                                                 //
 356                                                 if (val is string){
 357                                                         if (!ValidateGuid ((string) val))
 358                                                                 return null;
 359                                                 }
 360
 361                                         } else if (MarshalAsAttr)
 362                                                 this.UnmanagedType =
 363                                                 (System.Runtime.InteropServices.UnmanagedType) val;
 364                                 }
 365                         }
 366
 367                         //
 368                         // Now process named arguments
 369                         //
 370
 371                         ArrayList field_infos = null;
 372                         ArrayList prop_infos  = null;
 373                         ArrayList field_values = null;
 374                         ArrayList prop_values = null;
 375
 376                         if (named_args.Count > 0) {
 377                                 field_infos = new ArrayList ();
 378                                 prop_infos  = new ArrayList ();
 379                                 field_values = new ArrayList ();
 380                                 prop_values = new ArrayList ();
 381                         }
 382
 383                         Hashtable seen_names = new Hashtable();
 384
 385                         for (i = 0; i < named_args.Count; i++) {
 386                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 387                                 string member_name = (string) de.Key;
 388                                 Argument a  = (Argument) de.Value;
 389                                 Expression e;
 390
 391                                 if (seen_names.Contains(member_name)) {
 392                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 393                                         return null;
 394                                 }
 395                                 seen_names.Add(member_name, 1);
 396
 397                                 if (!a.Resolve (ec, Location))
 398                                         return null;
 399
 400                                 Expression member = Expression.MemberLookup (
 401                                         ec, Type, member_name,
 402                                         MemberTypes.Field | MemberTypes.Property,
 403                                         BindingFlags.Public | BindingFlags.Instance,
 404                                         Location);
 405
 406                                 if (member == null) {
 407                                         member = Expression.MemberLookup (ec, Type, member_name,
 408                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 409                                                 Location);
 410
 411                                         if (member != null) {
 412                                                 Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", GetFullMemberName (member_name));
 413                                                 return null;
 414                                         }
 415                                 }
 416
 417                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {
 418                                         Error_InvalidNamedArgument (member_name);
 419                                         return null;
 420                                 }
 421
 422                                 e = a.Expr;
 423                                 if (e is TypeParameterExpr){
 424                                         Error_TypeParameterInAttribute (Location);
 425                                         return null;
 426                                 }
 427
 428                                 if (member is PropertyExpr) {
 429                                         PropertyExpr pe = (PropertyExpr) member;
 430                                         PropertyInfo pi = pe.PropertyInfo;
 431
 432                                         if (!pi.CanWrite || !pi.CanRead) {
 433                                                 Report.SymbolRelatedToPreviousError (pi);
 434                                                 Error_InvalidNamedArgument (member_name);
 435                                                 return null;
 436                                         }
 437
 438                                         object value;
 439                                         if (!GetAttributeArgumentExpression (e, Location, pi.PropertyType, out value))
 440                                                                 return null;
 441
 442                                                 if (usage_attribute != null) {
 443                                                         if (member_name == "AllowMultiple")
 444                                                         usage_attribute.AllowMultiple = (bool) value;
 445                                                         if (member_name == "Inherited")
 446                                                         usage_attribute.Inherited = (bool) value;
 447                                         }
 448
 449                                         prop_values.Add (value);
 450                                         prop_infos.Add (pi);
 451
 452                                 } else if (member is FieldExpr) {
 453                                         FieldExpr fe = (FieldExpr) member;
 454                                         FieldInfo fi = fe.FieldInfo;
 455
 456                                         if (fi.IsInitOnly) {
 457                                                 Error_InvalidNamedArgument (member_name);
 458                                                 return null;
 459                                         }
 460
 461                                         object value;
 462                                         if (!GetAttributeArgumentExpression (e, Location, fi.FieldType, out value))
 463                                                 return null;
 464
 465                                         field_values.Add (value);
 466
 467                                         field_infos.Add (fi);
 468                                 }
 469                         }
 470
 471                         Expression mg = Expression.MemberLookup (
 472                                 ec, Type, ".ctor", MemberTypes.Constructor,
 473                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 474                                 Location);
 475
 476                         if (mg == null) {
 477                                 Error_AttributeConstructorMismatch ();
 478                                 return null;
 479                         }
 480
 481                         MethodBase constructor = Invocation.OverloadResolve (
 482                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 483
 484                         if (constructor == null) {
 485                                 return null;
 486                         }
 487
 488                         //
 489                         // Now we perform some checks on the positional args as they
 490                         // cannot be null for a constructor which expects a parameter
 491                         // of type object
 492                         //
 493
 494                         ParameterData pd = Invocation.GetParameterData (constructor);
 495
 496                         int group_in_params_array = Int32.MaxValue;
 497                         int pc = pd.Count;
 498                         if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)
 499                                 group_in_params_array = pc-1;
 500
 501                         for (int j = 0; j < pos_arg_count; ++j) {
 502                                 Argument a = (Argument) pos_args [j];
 503
 504                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 505                                         Error_AttributeArgumentNotValid (Location);
 506                                         return null;
 507                                 }
 508
 509                                 if (j < group_in_params_array)
 510                                         continue;
 511
 512                                 if (j == group_in_params_array){
 513                                         object v = pos_values [j];
 514                                         int count = pos_arg_count - j;
 515
 516                                         object [] array = new object [count];
 517                                         pos_values [j] = array;
 518                                         array [0] = v;
 519                                 } else {
 520                                         object [] array = (object []) pos_values [group_in_params_array];
 521
 522                                         array [j - group_in_params_array] = pos_values [j];
 523                                 }
 524                         }
 525
 526                         //
 527                         // Adjust the size of the pos_values if it had params
 528                         //
 529                         if (group_in_params_array != Int32.MaxValue){
 530                                 int argc = group_in_params_array+1;
 531                                 object [] new_pos_values = new object [argc];
 532
 533                                 for (int p = 0; p < argc; p++)
 534                                         new_pos_values [p] = pos_values [p];
 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                         } catch (NullReferenceException) {
 560                                 //
 561                                 // Don't know what to do here
 562                                 //
 563                                 Report.Warning (
 564                                         -101, Location, "NullReferenceException while trying to create attribute." +
 565                                         "Something's wrong!");
 566                         } catch (Exception e) {
 567                                 //
 568                                 // Sample:
 569                                 // using System.ComponentModel;
 570                                 // [DefaultValue (CollectionChangeAction.Add)]
 571                                 // class X { static void Main () {} }
 572                                 //
 573                                 Report.Warning (
 574                                         -23, Location, "The compiler can not encode this attribute in .NET due to a bug in the .NET runtime. Try the Mono runtime. The exception was: " + e.Message);
 575                         }
 576
 577                         return cb;
 578                 }
 579
 580                 /// <summary>
 581                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 582                 /// </summary>
 583                 public string GetValidTargets ()
 584                 {
 585                         StringBuilder sb = new StringBuilder ();
 586                         AttributeTargets targets = GetAttributeUsage ().ValidOn;
 587
 588                         if ((targets & AttributeTargets.Assembly) != 0)
 589                                 sb.Append ("'assembly' ");
 590
 591                         if ((targets & AttributeTargets.Class) != 0)
 592                                 sb.Append ("'class' ");
 593
 594                         if ((targets & AttributeTargets.Constructor) != 0)
 595                                 sb.Append ("'constructor' ");
 596
 597                         if ((targets & AttributeTargets.Delegate) != 0)
 598                                 sb.Append ("'delegate' ");
 599
 600                         if ((targets & AttributeTargets.Enum) != 0)
 601                                 sb.Append ("'enum' ");
 602
 603                         if ((targets & AttributeTargets.Event) != 0)
 604                                 sb.Append ("'event' ");
 605
 606                         if ((targets & AttributeTargets.Field) != 0)
 607                                 sb.Append ("'field' ");
 608
 609                         if ((targets & AttributeTargets.Interface) != 0)
 610                                 sb.Append ("'interface' ");
 611
 612                         if ((targets & AttributeTargets.Method) != 0)
 613                                 sb.Append ("'method' ");
 614
 615                         if ((targets & AttributeTargets.Module) != 0)
 616                                 sb.Append ("'module' ");
 617
 618                         if ((targets & AttributeTargets.Parameter) != 0)
 619                                 sb.Append ("'parameter' ");
 620
 621                         if ((targets & AttributeTargets.Property) != 0)
 622                                 sb.Append ("'property' ");
 623
 624                         if ((targets & AttributeTargets.ReturnValue) != 0)
 625                                 sb.Append ("'return' ");
 626
 627                         if ((targets & AttributeTargets.Struct) != 0)
 628                                 sb.Append ("'struct' ");
 629
 630                         return sb.ToString ();
 631
 632                 }
 633
 634                 /// <summary>
 635                 /// Returns AttributeUsage attribute for this type
 636                 /// </summary>
 637                 public AttributeUsageAttribute GetAttributeUsage ()
 638                 {
 639                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 640                         if (ua != null)
 641                                 return ua;
 642
 643                         Class attr_class = TypeManager.LookupClass (Type);
 644
 645                         if (attr_class == null) {
 646                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 647                                 ua = (AttributeUsageAttribute)usage_attr [0];
 648                                 usage_attr_cache.Add (Type, ua);
 649                                 return ua;
 650                         }
 651
 652                         return attr_class.AttributeUsage;
 653                 }
 654
 655                 /// <summary>
 656                 /// Returns custom name of indexer
 657                 /// </summary>
 658                 public string GetIndexerAttributeValue (EmitContext ec)
 659                 {
 660                         if (pos_values == null) {
 661                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 662                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 663                                 Resolve (ec);
 664                         }
 665
 666                         return pos_values [0] as string;
 667                 }
 668
 669                 /// <summary>
 670                 /// Returns condition of ConditionalAttribute
 671                 /// </summary>
 672                 public string GetConditionalAttributeValue (DeclSpace ds)
 673                 {
 674                         if (pos_values == null) {
 675                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 676
 677                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 678                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 679                                 Resolve (ec);
 680                         }
 681
 682                         // Some error occurred
 683                         if (pos_values [0] == null)
 684                                 return null;
 685
 686                         return (string)pos_values [0];
 687                 }
 688
 689                 /// <summary>
 690                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 691                 /// </summary>
 692                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 693                 {
 694                         if (pos_values == null) {
 695                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 696
 697                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 698                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 699                                 Resolve (ec);
 700                         }
 701
 702                         // Some error occurred
 703                         if (pos_values == null)
 704                                 return null;
 705
 706                         if (pos_values.Length == 0)
 707                                 return new ObsoleteAttribute ();
 708
 709                         if (pos_values.Length == 1)
 710                                 return new ObsoleteAttribute ((string)pos_values [0]);
 711
 712                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 713                 }
 714
 715                 /// <summary>
 716                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 717                 /// before ApplyAttribute. We need to resolve the arguments.
 718                 /// This situation occurs when class deps is differs from Emit order.
 719                 /// </summary>
 720                 public bool GetClsCompliantAttributeValue (DeclSpace ds)
 721                 {
 722                         if (pos_values == null) {
 723                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 724
 725                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 726                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 727                                 Resolve (ec);
 728                         }
 729
 730                         // Some error occurred
 731                         if (pos_values [0] == null)
 732                                 return false;
 733
 734                         return (bool)pos_values [0];
 735                 }
 736
 737                 /// <summary>
 738                 /// Tests permitted SecurityAction for assembly or other types
 739                 /// </summary>
 740                 public bool CheckSecurityActionValidity (bool for_assembly)
 741                 {
 742                         SecurityAction action  = GetSecurityActionValue ();
 743
 744                         if ((action == SecurityAction.RequestMinimum || action == SecurityAction.RequestOptional || action == SecurityAction.RequestRefuse) && for_assembly)
 745                                 return true;
 746
 747                         if (!for_assembly) {
 748                                 if (action < SecurityAction.Demand || action > SecurityAction.InheritanceDemand) {
 749                                         Error_AttributeEmitError ("SecurityAction is out of range");
 750                                         return false;
 751                                 }
 752
 753                                 if ((action != SecurityAction.RequestMinimum && action != SecurityAction.RequestOptional && action != SecurityAction.RequestRefuse) && !for_assembly)
 754                                         return true;
 755                         }
 756
 757                         Error_AttributeEmitError (String.Concat ("SecurityAction '", action, "' is not valid for this declaration"));
 758                         return false;
 759                 }
 760
 761                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 762                 {
 763                         return (SecurityAction)pos_values [0];
 764                 }
 765
 766                 /// <summary>
 767                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 768                 /// </summary>
 769                 /// <returns></returns>
 770                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 771                 {
 772                         if (TypeManager.LookupDeclSpace (Type) != null && RootContext.StdLib) {
 773                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 774                                 return;
 775                         }
 776
 777                         SecurityAttribute sa;
 778                         // For all assemblies except corlib we can avoid all hacks
 779                         if (RootContext.StdLib) {
 780                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 781
 782                                 if (prop_info_arr != null) {
 783                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 784                                                 PropertyInfo pi = prop_info_arr [i];
 785                                                 pi.SetValue (sa, prop_values_arr [i], null);
 786                                         }
 787                                 }
 788                         } else {
 789                                 Type temp_type = Type.GetType (Type.FullName);
 790                                 // HACK: All mscorlib attributes have same ctor syntax
 791                                 sa = (SecurityAttribute) Activator.CreateInstance (temp_type, new object[] { GetSecurityActionValue () } );
 792
 793                                 // All types are from newly created corlib but for invocation with old we need to convert them
 794                                 if (prop_info_arr != null) {
 795                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 796                                                 PropertyInfo emited_pi = prop_info_arr [i];
 797                                                 PropertyInfo pi = temp_type.GetProperty (emited_pi.Name, emited_pi.PropertyType);
 798
 799                                                 object old_instance = pi.PropertyType.IsEnum ?
 800                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
 801                                                         prop_values_arr [i];
 802
 803                                                 pi.SetValue (sa, old_instance, null);
 804                                         }
 805                                 }
 806                         }
 807
 808                         IPermission perm = sa.CreatePermission ();
 809                         SecurityAction action;
 810
 811                         // IS is correct because for corlib we are using an instance from old corlib
 812                         if (perm is System.Security.CodeAccessPermission) {
 813                                 action = GetSecurityActionValue ();
 814                         } else {
 815                                 switch (GetSecurityActionValue ()) {
 816                                         case SecurityAction.Demand:
 817                                                 action = (SecurityAction)13;
 818                                                 break;
 819                                         case SecurityAction.LinkDemand:
 820                                                 action = (SecurityAction)14;
 821                                                 break;
 822                                         case SecurityAction.InheritanceDemand:
 823                                                 action = (SecurityAction)15;
 824                                                 break;
 825                                         default:
 826                                                 Error_AttributeEmitError ("Invalid SecurityAction for non-Code Access Security permission");
 827                                                 return;
 828                                 }
 829                         }
 830
 831                         PermissionSet ps = (PermissionSet)permissions [action];
 832                         if (ps == null) {
 833                                 ps = new PermissionSet (PermissionState.None);
 834                                 permissions.Add (action, ps);
 835                         }
 836                         ps.AddPermission (sa.CreatePermission ());
 837                 }
 838
 839                 object GetValue (object value)
 840                 {
 841                         if (value is EnumConstant)
 842                                 return ((EnumConstant) value).GetValue ();
 843                         else
 844                                 return value;
 845                 }
 846
 847                 public object GetPositionalValue (int i)
 848                 {
 849                         return (pos_values == null) ? null : pos_values[i];
 850                 }
 851
 852                 object GetFieldValue (string name)
 853                 {
 854                         int i;
 855                         if (field_info_arr == null)
 856                                 return null;
 857                         i = 0;
 858                         foreach (FieldInfo fi in field_info_arr) {
 859                                 if (fi.Name == name)
 860                                         return GetValue (field_values_arr [i]);
 861                                 i++;
 862                         }
 863                         return null;
 864                 }
 865
 866                 public UnmanagedMarshal GetMarshal (Attributable attr)
 867                 {
 868                         object value = GetFieldValue ("SizeParamIndex");
 869                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
 870                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
 871                                 return null;
 872                         }
 873
 874                         object o = GetFieldValue ("ArraySubType");
 875                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 876
 877                         switch (UnmanagedType) {
 878                         case UnmanagedType.CustomMarshaler:
 879                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 880                                                                        BindingFlags.Static | BindingFlags.Public);
 881                                 if (define_custom == null) {
 882                                         Report.RuntimeMissingSupport (Location, "set marshal info");
 883                                         return null;
 884                                 }
 885
 886                                 object [] args = new object [4];
 887                                 args [0] = GetFieldValue ("MarshalTypeRef");
 888                                 args [1] = GetFieldValue ("MarshalCookie");
 889                                 args [2] = GetFieldValue ("MarshalType");
 890                                 args [3] = Guid.Empty;
 891                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 892
 893                         case UnmanagedType.LPArray:
 894                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 895
 896                         case UnmanagedType.SafeArray:
 897                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 898
 899                         case UnmanagedType.ByValArray:
 900                                 FieldMember fm = attr as FieldMember;
 901                                 if (fm == null) {
 902                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
 903                                         return null;
 904                                 }
 905                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 906
 907                         case UnmanagedType.ByValTStr:
 908                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 909
 910                         default:
 911                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 912                         }
 913                 }
 914
 915                 public bool IsInternalCall
 916                 {
 917                         get { return ImplOptions == MethodImplOptions.InternalCall; }
 918                 }
 919
 920                 /// <summary>
 921                 /// Emit attribute for Attributable symbol
 922                 /// </summary>
 923                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 924                 {
 925                         CustomAttributeBuilder cb = Resolve (ec);
 926                         if (cb == null)
 927                                 return;
 928
 929                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
 930                         if ((usage_attr.ValidOn & Target) == 0) {
 931                                 Report.Error (592, Location, "Attribute '{0}' is not valid on this declaration type. It is valid on {1} declarations only.", Name, GetValidTargets ());
 932                                 return;
 933                         }
 934
 935                         ias.ApplyAttributeBuilder (this, cb);
 936
 937                         if (!usage_attr.AllowMultiple) {
 938                                 ArrayList emitted_targets = (ArrayList)emitted_attr [Type];
 939                                 if (emitted_targets == null) {
 940                                         emitted_targets = new ArrayList ();
 941                                         emitted_attr.Add (Type, emitted_targets);
 942                                 } else if (emitted_targets.Contains (Target)) {
 943                                 Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
 944                                         return;
 945                                 }
 946                                 emitted_targets.Add (Target);
 947                         }
 948
 949                         if (!RootContext.VerifyClsCompliance)
 950                                 return;
 951
 952                         // Here we are testing attribute arguments for array usage (error 3016)
 953                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
 954                                 if (Arguments == null)
 955                                         return;
 956
 957                                 ArrayList pos_args = (ArrayList) Arguments [0];
 958                                 if (pos_args != null) {
 959                                         foreach (Argument arg in pos_args) {
 960                                                 // Type is undefined (was error 246)
 961                                                 if (arg.Type == null)
 962                                                         return;
 963
 964                                                 if (arg.Type.IsArray) {
 965                                                         Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 966                                                         return;
 967                                                 }
 968                                         }
 969                                 }
 970
 971                                 if (Arguments.Count < 2)
 972                                         return;
 973
 974                                 ArrayList named_args = (ArrayList) Arguments [1];
 975                                 foreach (DictionaryEntry de in named_args) {
 976                                         Argument arg  = (Argument) de.Value;
 977
 978                                         // Type is undefined (was error 246)
 979                                         if (arg.Type == null)
 980                                                 return;
 981
 982                                         if (arg.Type.IsArray) {
 983                                                 Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 984                                                 return;
 985                                         }
 986                                 }
 987                         }
 988                 }
 989
 990                 public object GetValue (EmitContext ec, Constant c, Type target)
 991                 {
 992                         if (Convert.ImplicitConversionExists (ec, c, target))
 993                                 return c.GetValue ();
 994
 995                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
 996                         return null;
 997                 }
 998
 999                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
1000                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
1001                 {
1002                         //
1003                         // We extract from the attribute the information we need
1004                         //
1005
1006                         if (Arguments == null) {
1007                                 Console.WriteLine ("Internal error : this is not supposed to happen !");
1008                                 return null;
1009                         }
1010
1011                         ResolveType (ec, true);
1012                         if (Type == null)
1013                                 return null;
1014
1015                         ArrayList named_args = new ArrayList ();
1016
1017                         ArrayList pos_args = (ArrayList) Arguments [0];
1018                         if (Arguments.Count > 1)
1019                                 named_args = (ArrayList) Arguments [1];
1020
1021
1022                         string dll_name = null;
1023
1024                         Argument tmp = (Argument) pos_args [0];
1025
1026                         if (!tmp.Resolve (ec, Location))
1027                                 return null;
1028
1029                         if (tmp.Expr is Constant)
1030                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();
1031                         else {
1032                                 Error_AttributeArgumentNotValid (Location);
1033                                 return null;
1034                         }
1035
1036                         // Now we process the named arguments
1037                         CallingConvention cc = CallingConvention.Winapi;
1038                         CharSet charset = CharSet.Ansi;
1039                         bool preserve_sig = true;
1040 #if FIXME
1041                         bool exact_spelling = false;
1042 #endif
1043                         bool set_last_err = false;
1044                         string entry_point = null;
1045
1046                         for (int i = 0; i < named_args.Count; i++) {
1047
1048                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
1049
1050                                 string member_name = (string) de.Key;
1051                                 Argument a  = (Argument) de.Value;
1052
1053                                 if (!a.Resolve (ec, Location))
1054                                         return null;
1055
1056                                 Expression member = Expression.MemberLookup (
1057                                         ec, Type, member_name,
1058                                         MemberTypes.Field | MemberTypes.Property,
1059                                         BindingFlags.Public | BindingFlags.Instance,
1060                                         Location);
1061
1062                                 if (member == null || !(member is FieldExpr)) {
1063                                         Error_InvalidNamedArgument (member_name);
1064                                         return null;
1065                                 }
1066
1067                                 if (member is FieldExpr) {
1068                                         FieldExpr fe = (FieldExpr) member;
1069                                         FieldInfo fi = fe.FieldInfo;
1070
1071                                         if (fi.IsInitOnly) {
1072                                                 Error_InvalidNamedArgument (member_name);
1073                                                 return null;
1074                                         }
1075
1076                                         if (a.Expr is Constant) {
1077                                                 Constant c = (Constant) a.Expr;
1078
1079                                                 try {
1080                                                         if (member_name == "CallingConvention"){
1081                                                                 object val = GetValue (ec, c, typeof (CallingConvention));
1082                                                                 if (val == null)
1083                                                                         return null;
1084                                                                 cc = (CallingConvention) val;
1085                                                         } else if (member_name == "CharSet"){
1086                                                                 charset = (CharSet) c.GetValue ();
1087                                                         } else if (member_name == "EntryPoint")
1088                                                                 entry_point = (string) c.GetValue ();
1089                                                         else if (member_name == "SetLastError")
1090                                                                 set_last_err = (bool) c.GetValue ();
1091 #if FIXME
1092                                                         else if (member_name == "ExactSpelling")
1093                                                                 exact_spelling = (bool) c.GetValue ();
1094 #endif
1095                                                         else if (member_name == "PreserveSig")
1096                                                                 preserve_sig = (bool) c.GetValue ();
1097                                                 } catch (InvalidCastException){
1098                                                         Error_InvalidNamedArgument (member_name);
1099                                                         Error_AttributeArgumentNotValid (Location);
1100                                                 }
1101                                         } else {
1102                                                 Error_AttributeArgumentNotValid (Location);
1103                                                 return null;
1104                                         }
1105
1106                                 }
1107                         }
1108
1109                         if (entry_point == null)
1110                                 entry_point = name;
1111                         if (set_last_err)
1112                                 charset = (CharSet)((int)charset | 0x40);
1113
1114                         MethodBuilder mb = builder.DefinePInvokeMethod (
1115                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,
1116                                 CallingConventions.Standard,
1117                                 ret_type,
1118                                 param_types,
1119                                 cc,
1120                                 charset);
1121
1122                         if (preserve_sig)
1123                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
1124
1125                         return mb;
1126                 }
1127
1128                 private Expression GetValue ()
1129                 {
1130                         if ((Arguments == null) || (Arguments.Count < 1))
1131                                 return null;
1132                         ArrayList al = (ArrayList) Arguments [0];
1133                         if ((al == null) || (al.Count < 1))
1134                                 return null;
1135                         Argument arg = (Argument) al [0];
1136                         if ((arg == null) || (arg.Expr == null))
1137                                 return null;
1138                         return arg.Expr;
1139                 }
1140
1141                 public string GetString ()
1142                 {
1143                         Expression e = GetValue ();
1144                         if (e is StringLiteral)
1145                                 return (e as StringLiteral).Value;
1146                         return null;
1147                 }
1148
1149                 public bool GetBoolean ()
1150                 {
1151                         Expression e = GetValue ();
1152                         if (e is BoolLiteral)
1153                                 return (e as BoolLiteral).Value;
1154                         return false;
1155                 }
1156         }
1157
1158
1159         /// <summary>
1160         /// For global attributes (assembly, module) we need special handling.
1161         /// Attributes can be located in the several files
1162         /// </summary>
1163         public class GlobalAttribute: Attribute
1164         {
1165                 public readonly NamespaceEntry ns;
1166
1167                 public GlobalAttribute (TypeContainer container, string target, string name, ArrayList args, Location loc):
1168                         base (target, name, args, loc)
1169                 {
1170                         ns = container.NamespaceEntry;
1171                 }
1172
1173                 protected override Type CheckAttributeType (EmitContext ec, bool complain)
1174                 {
1175                         NamespaceEntry old = ec.DeclSpace.NamespaceEntry;
1176                         if (old == null || old.NS == null || old.NS == Namespace.Root)
1177                                 ec.DeclSpace.NamespaceEntry = ns;
1178                         return base.CheckAttributeType (ec, complain);
1179                 }
1180         }
1181
1182         public class Attributes {
1183                 public ArrayList Attrs;
1184
1185                 public Attributes (Attribute a)
1186                 {
1187                         Attrs = new ArrayList ();
1188                         Attrs.Add (a);
1189                 }
1190
1191                 public Attributes (ArrayList attrs)
1192                 {
1193                         Attrs = attrs;
1194                 }
1195
1196                 public void AddAttributes (ArrayList attrs)
1197                 {
1198                         Attrs.AddRange (attrs);
1199                 }
1200
1201                 /// <summary>
1202                 /// Checks whether attribute target is valid for the current element
1203                 /// </summary>
1204                 public void CheckTargets (Attributable member)
1205                 {
1206                         string[] valid_targets = member.ValidAttributeTargets;
1207                         foreach (Attribute a in Attrs) {
1208                                 if (a.ExplicitTarget == null || a.ExplicitTarget == valid_targets [0]) {
1209                                         a.Target = member.AttributeTargets;
1210                                         continue;
1211                                 }
1212
1213                                 // TODO: we can skip the first item
1214                                 if (((IList) valid_targets).Contains (a.ExplicitTarget)) {
1215                                         switch (a.ExplicitTarget) {
1216                                                 case "return": a.Target = AttributeTargets.ReturnValue; continue;
1217                                                 case "param": a.Target = AttributeTargets.Parameter; continue;
1218                                                 case "field": a.Target = AttributeTargets.Field; continue;
1219                                                 case "method": a.Target = AttributeTargets.Method; continue;
1220                                                 case "property": a.Target = AttributeTargets.Property; continue;
1221                                         }
1222                                         throw new InternalErrorException ("Unknown explicit target: " + a.ExplicitTarget);
1223                                 }
1224
1225                                 StringBuilder sb = new StringBuilder ();
1226                                 foreach (string s in valid_targets) {
1227                                         sb.Append (s);
1228                                         sb.Append (", ");
1229                                 }
1230                                 sb.Remove (sb.Length - 2, 2);
1231                                 Report.Error (657, a.Location, "'{0}' is not a valid attribute location for this declaration. Valid attribute locations for this declaration are '{1}'", a.Target, sb.ToString ());
1232                         }
1233                 }
1234
1235                 private Attribute Search (Type t, EmitContext ec, bool complain)
1236                 {
1237                         foreach (Attribute a in Attrs) {
1238                                 if (a.ResolveType (ec, complain) == t)
1239                                         return a;
1240                         }
1241                         return null;
1242                 }
1243
1244                 public Attribute Search (Type t, EmitContext ec)
1245                 {
1246                         return Search (t, ec, true);
1247                 }
1248
1249                 /// <summary>
1250                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1251                 /// </summary>
1252                 public Attribute[] SearchMulti (Type t, EmitContext ec)
1253                 {
1254                         ArrayList ar = null;
1255
1256                         foreach (Attribute a in Attrs) {
1257                                 if (a.ResolveType (ec, false) == t) {
1258                                         if (ar == null)
1259                                                 ar = new ArrayList ();
1260                                         ar.Add (a);
1261                                 }
1262                         }
1263
1264                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1265                 }
1266
1267                 public void Emit (EmitContext ec, Attributable ias)
1268                 {
1269                         ListDictionary ld = new ListDictionary ();
1270
1271                         foreach (Attribute a in Attrs)
1272                                 a.Emit (ec, ias, ld);
1273                 }
1274
1275                 public bool Contains (Type t, EmitContext ec)
1276                 {
1277                         return Search (t, ec) != null;
1278                 }
1279
1280                 public Attribute GetClsCompliantAttribute (EmitContext ec)
1281                 {
1282                         return Search (TypeManager.cls_compliant_attribute_type, ec, false);
1283                 }
1284
1285                 /// <summary>
1286                 /// Pulls the IndexerName attribute from an Indexer if it exists.
1287                 /// </summary>
1288                 public Attribute GetIndexerNameAttribute (EmitContext ec)
1289                 {
1290                         Attribute a = Search (TypeManager.indexer_name_type, ec, false);
1291                         if (a == null)
1292                                 return null;
1293
1294                         // Remove the attribute from the list because it is not emitted
1295                         Attrs.Remove (a);
1296                         return a;
1297                 }
1298
1299         }
1300
1301         /// <summary>
1302         /// Helper class for attribute verification routine.
1303         /// </summary>
1304         sealed class AttributeTester
1305         {
1306                 static PtrHashtable analyzed_types = new PtrHashtable ();
1307                 static PtrHashtable analyzed_types_obsolete = new PtrHashtable ();
1308                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1309                 static PtrHashtable analyzed_method_excluded = new PtrHashtable ();
1310
1311                 private AttributeTester ()
1312                 {
1313                 }
1314
1315                 /// <summary>
1316                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1317                 /// It tests differing only in ref or out, or in array rank.
1318                 /// </summary>
1319                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1320                 {
1321                         if (types_a == null || types_b == null)
1322                                 return true;
1323
1324                         if (types_a.Length != types_b.Length)
1325                                 return true;
1326
1327                         for (int i = 0; i < types_b.Length; ++i) {
1328                                 Type aType = types_a [i];
1329                                 Type bType = types_b [i];
1330
1331                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1332                                         return false;
1333                                 }
1334
1335                                 Type aBaseType = aType;
1336                                 bool is_either_ref_or_out = false;
1337
1338                                 if (aType.IsByRef || aType.IsPointer) {
1339                                         aBaseType = aType.GetElementType ();
1340                                         is_either_ref_or_out = true;
1341                                 }
1342
1343                                 Type bBaseType = bType;
1344                                 if (bType.IsByRef || bType.IsPointer)
1345                                 {
1346                                         bBaseType = bType.GetElementType ();
1347                                         is_either_ref_or_out = !is_either_ref_or_out;
1348                                 }
1349
1350                                 if (aBaseType != bBaseType)
1351                                         continue;
1352
1353                                 if (is_either_ref_or_out)
1354                                         return false;
1355                         }
1356                         return true;
1357                 }
1358
1359                 /// <summary>
1360                 /// Goes through all parameters and test if they are CLS-Compliant.
1361                 /// </summary>
1362                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1363                 {
1364                         if (fixedParameters == null)
1365                                 return true;
1366
1367                         foreach (Parameter arg in fixedParameters) {
1368                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1369                                         Report.Error (3001, loc, "Argument type '{0}' is not CLS-compliant", arg.GetSignatureForError ());
1370                                         return false;
1371                                 }
1372                         }
1373                         return true;
1374                 }
1375
1376
1377                 /// <summary>
1378                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1379                 /// </summary>
1380                 public static bool IsClsCompliant (Type type)
1381                 {
1382                         if (type == null)
1383                                 return true;
1384
1385                         object type_compliance = analyzed_types[type];
1386                         if (type_compliance != null)
1387                                 return type_compliance == TRUE;
1388
1389                         if (type.IsPointer) {
1390                                 analyzed_types.Add (type, null);
1391                                 return false;
1392                         }
1393
1394                         bool result;
1395                         if (type.IsArray || type.IsByRef)       {
1396                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1397                         } else {
1398                                 result = AnalyzeTypeCompliance (type);
1399                         }
1400                         analyzed_types.Add (type, result ? TRUE : FALSE);
1401                         return result;
1402                 }
1403
1404                 static object TRUE = new object ();
1405                 static object FALSE = new object ();
1406
1407                 public static void VerifyModulesClsCompliance ()
1408                 {
1409                         Module[] modules = TypeManager.Modules;
1410                         if (modules == null)
1411                                 return;
1412
1413                         // The first module is generated assembly
1414                         for (int i = 1; i < modules.Length; ++i) {
1415                                 Module module = modules [i];
1416                                 if (!IsClsCompliant (module)) {
1417                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute to match the assembly", module.Name);
1418                                         return;
1419                                 }
1420                         }
1421                 }
1422
1423                 /// <summary>
1424                 /// Tests container name for CLS-Compliant name (differing only in case)
1425                 /// </summary>
1426                 public static void VerifyTopLevelNameClsCompliance ()
1427                 {
1428                         Hashtable locase_table = new Hashtable ();
1429
1430                         // Convert imported type names to lower case and ignore not cls compliant
1431                         foreach (DictionaryEntry de in TypeManager.all_imported_types) {
1432                                 Type t = (Type)de.Value;
1433                                 if (!AttributeTester.IsClsCompliant (t))
1434                                         continue;
1435
1436                                 locase_table.Add (((string)de.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture), t);
1437                         }
1438
1439                         foreach (DictionaryEntry de in RootContext.Tree.Decls) {
1440                                 DeclSpace decl = (DeclSpace)de.Value;
1441                                 if (!decl.IsClsCompliaceRequired (decl))
1442                                         continue;
1443
1444                                 string lcase = decl.Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1445                                 if (!locase_table.Contains (lcase)) {
1446                                         locase_table.Add (lcase, decl);
1447                                         continue;
1448                                 }
1449
1450                                 object conflict = locase_table [lcase];
1451                                 if (conflict is Type)
1452                                         Report.SymbolRelatedToPreviousError ((Type)conflict);
1453                                 else
1454                                         Report.SymbolRelatedToPreviousError ((MemberCore)conflict);
1455
1456                                 Report.Error (3005, decl.Location, "Identifier '{0}' differing only in case is not CLS-compliant", decl.GetSignatureForError ());
1457                         }
1458                 }
1459
1460                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1461                 {
1462                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1463                         if (CompliantAttribute.Length == 0)
1464                                 return false;
1465
1466                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1467                 }
1468
1469                 static bool AnalyzeTypeCompliance (Type type)
1470                 {
1471                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1472                         if (ds != null) {
1473                                 return ds.IsClsCompliaceRequired (ds.Parent);
1474                         }
1475
1476                         if (type.IsGenericParameter)
1477                                 return false;
1478
1479                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1480                         if (CompliantAttribute.Length == 0)
1481                                 return IsClsCompliant (type.Assembly);
1482
1483                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1484                 }
1485
1486                 /// <summary>
1487                 /// Returns instance of ObsoleteAttribute when type is obsolete
1488                 /// </summary>
1489                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1490                 {
1491                         object type_obsolete = analyzed_types_obsolete [type];
1492                         if (type_obsolete == FALSE)
1493                                 return null;
1494
1495                         if (type_obsolete != null)
1496                                 return (ObsoleteAttribute)type_obsolete;
1497
1498                         ObsoleteAttribute result = null;
1499                         if (type.IsByRef || type.IsArray || type.IsPointer) {
1500                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1501                         } else if (type.IsGenericParameter || type.IsGenericInstance)
1502                                 return null;
1503                         else {
1504                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1505
1506                                 // Type is external, we can get attribute directly
1507                                 if (type_ds == null) {
1508                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1509                                         if (attribute.Length == 1)
1510                                                 result = (ObsoleteAttribute)attribute [0];
1511                                 } else {
1512                                         result = type_ds.GetObsoleteAttribute (type_ds);
1513                                 }
1514                         }
1515
1516                         analyzed_types_obsolete.Add (type, result == null ? FALSE : result);
1517                         return result;
1518                 }
1519
1520                 /// <summary>
1521                 /// Returns instance of ObsoleteAttribute when method is obsolete
1522                 /// </summary>
1523                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1524                 {
1525                         IMethodData mc = TypeManager.GetMethod (mb);
1526                         if (mc != null)
1527                                 return mc.GetObsoleteAttribute ();
1528
1529                         // compiler generated methods are not registered by AddMethod
1530                         if (mb.DeclaringType is TypeBuilder)
1531                                 return null;
1532
1533                         return GetMemberObsoleteAttribute (mb);
1534                 }
1535
1536                 /// <summary>
1537                 /// Returns instance of ObsoleteAttribute when member is obsolete
1538                 /// </summary>
1539                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1540                 {
1541                         object type_obsolete = analyzed_member_obsolete [mi];
1542                         if (type_obsolete == FALSE)
1543                                 return null;
1544
1545                         if (type_obsolete != null)
1546                                 return (ObsoleteAttribute)type_obsolete;
1547
1548                         if ((mi.DeclaringType is TypeBuilder) || mi.DeclaringType.IsGenericInstance)
1549                                 return null;
1550
1551                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1552                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1553                         return oa;
1554                 }
1555
1556                 /// <summary>
1557                 /// Common method for Obsolete error/warning reporting.
1558                 /// </summary>
1559                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1560                 {
1561                         if (oa.IsError) {
1562                                 Report.Error (619, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1563                                 return;
1564                         }
1565
1566                         if (oa.Message == null) {
1567                                 Report.Warning (612, loc, "'{0}' is obsolete", member);
1568                                 return;
1569                         }
1570                         if (RootContext.WarningLevel >= 2)
1571                                 Report.Warning (618, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1572                 }
1573
1574                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1575                 {
1576                         object excluded = analyzed_method_excluded [mb];
1577                         if (excluded != null)
1578                                 return excluded == TRUE ? true : false;
1579
1580                         if (mb.Mono_IsInflatedMethod)
1581                                 return false;
1582
1583                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true) as ConditionalAttribute[];
1584                         if (attrs.Length == 0) {
1585                                 analyzed_method_excluded.Add (mb, FALSE);
1586                                 return false;
1587                         }
1588
1589                         foreach (ConditionalAttribute a in attrs) {
1590                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1591                                         analyzed_method_excluded.Add (mb, FALSE);
1592                                         return false;
1593                                 }
1594                         }
1595                         analyzed_method_excluded.Add (mb, TRUE);
1596                         return true;
1597                 }
1598         }
1599 }