mcs/mcs/attribute.cs

   1 //
   2 // attribute.cs: Attribute Handler
   3 //
   4 // Author: Ravi Pratap (ravi@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // 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 ArrayList Arguments;
  76
  77                 public readonly Location Location;
  78
  79                 public Type Type;
  80
  81                 // Is non-null if type is AttributeUsageAttribute
  82                 AttributeUsageAttribute usage_attribute;
  83
  84                 public AttributeUsageAttribute UsageAttribute {
  85                         get {
  86                                 return usage_attribute;
  87                         }
  88                 }
  89
  90                 MethodImplOptions ImplOptions;
  91                 UnmanagedType     UnmanagedType;
  92                 CustomAttributeBuilder cb;
  93
  94                 // non-null if named args present after Resolve () is called
  95                 PropertyInfo [] prop_info_arr;
  96                 FieldInfo [] field_info_arr;
  97                 object [] field_values_arr;
  98                 object [] prop_values_arr;
  99                 object [] pos_values;
 100
 101                 static PtrHashtable usage_attr_cache = new PtrHashtable ();
 102
 103                 public Attribute (string target, string name, ArrayList args, Location loc)
 104                 {
 105                         Name = name;
 106                         Arguments = args;
 107                         Location = loc;
 108                         ExplicitTarget = target;
 109                 }
 110
 111                 void Error_InvalidNamedArgument (string name)
 112                 {
 113                         Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +
 114                                       "argument. Named attribute arguments must be fields which are not " +
 115                                       "readonly, static or const, or read-write properties which are not static.");
 116                 }
 117
 118                 static void Error_AttributeArgumentNotValid (Location loc)
 119                 {
 120                         Report.Error (182, loc,
 121                                       "An attribute argument must be a constant expression, typeof " +
 122                                       "expression or array creation expression");
 123                 }
 124
 125                 /// <summary>
 126                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 127                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 128                 /// </summary>
 129                 public void Error_AttributeEmitError (string inner)
 130                 {
 131                         Report.Error (647, Location, "Error emitting '{0}' attribute because '{1}'", Name, inner);
 132                 }
 133
 134                 public void Error_InvalidSecurityParent ()
 135                 {
 136                         Error_AttributeEmitError ("it is attached to invalid parent");
 137                 }
 138
 139                 void Error_AttributeConstructorMismatch ()
 140                 {
 141                         Report.Error (-6, Location,
 142                                       "Could not find a constructor for this argument list.");
 143                 }
 144
 145                 /// <summary>
 146                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 147                 /// </summary>
 148                 protected virtual Type CheckAttributeType (EmitContext ec, bool complain)
 149                 {
 150                         Type t1 = RootContext.LookupType (ec.DeclSpace, Name, true, Location);
 151
 152                         // FIXME: Shouldn't do this for quoted attributes: [@A]
 153                         Type t2 = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);
 154
 155                         String err0616 = null;
 156
 157                         if (t1 != null && ! t1.IsSubclassOf (TypeManager.attribute_type)) {
 158                                 t1 = null;
 159                                 err0616 = "'" + Name + "': is not an attribute class";
 160                         }
 161                         if (t2 != null && ! t2.IsSubclassOf (TypeManager.attribute_type)) {
 162                                 t2 = null;
 163                                 err0616 = (err0616 != null)
 164                                         ? "Neither '" + Name + "' nor '" + Name + "Attribute' is an attribute class"
 165                                         : "'" + Name + "Attribute': is not an attribute class";
 166                         }
 167
 168                         if (t1 != null && t2 != null) {
 169                                 Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
 170                                              + " use either '@" + Name + "' or '" + Name + "Attribute'");
 171                                 return null;
 172                         }
 173                         if (t1 != null)
 174                                 return t1;
 175                         if (t2 != null)
 176                                 return t2;
 177
 178                         if (err0616 != null) {
 179                                 Report.Error (616, Location, err0616);
 180                                 return null;
 181                         }
 182
 183                         if (complain)
 184                                 Report.Error (246, Location,
 185                                               "Could not find attribute '" + Name
 186                                               + "' (are you missing a using directive or an assembly reference ?)");
 187                         return null;
 188                 }
 189
 190                 public Type ResolveType (EmitContext ec, bool complain)
 191                 {
 192                         if (Type == null)
 193                                 Type = CheckAttributeType (ec, complain);
 194                         return Type;
 195                 }
 196
 197                 /// <summary>
 198                 ///   Validates the guid string
 199                 /// </summary>
 200                 bool ValidateGuid (string guid)
 201                 {
 202                         try {
 203                                 new Guid (guid);
 204                                 return true;
 205                         } catch {
 206                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);
 207                                 return false;
 208                         }
 209                 }
 210
 211                 string GetFullMemberName (string member)
 212                 {
 213                         return Type.FullName + '.' + member;
 214                 }
 215
 216                 //
 217                 // Given an expression, if the expression is a valid attribute-argument-expression
 218                 // returns an object that can be used to encode it, or null on failure.
 219                 //
 220                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, Type arg_type, out object result)
 221                 {
 222                         if (e is EnumConstant) {
 223                                 if (RootContext.StdLib)
 224                                         result = ((EnumConstant)e).GetValueAsEnumType ();
 225                                 else
 226                                         result = ((EnumConstant)e).GetValue ();
 227
 228                                 return true;
 229                         }
 230
 231                         Constant constant = e as Constant;
 232                         if (constant != null) {
 233                                 if (e.Type != arg_type) {
 234                                         constant = Const.ChangeType (loc, constant, arg_type);
 235                                         if (constant == null) {
 236                                                 result = null;
 237                                                 Error_AttributeArgumentNotValid (loc);
 238                                                 return false;
 239                                         }
 240                                 }
 241                                 result = constant.GetValue ();
 242                                 return true;
 243                         } else if (e is TypeOf) {
 244                                 result = ((TypeOf) e).TypeArg;
 245                                 return true;
 246                         } else if (e is ArrayCreation){
 247                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 248                                 if (result != null)
 249                                         return true;
 250                         } else if (e is EmptyCast) {
 251                                 Expression child = ((EmptyCast)e).Child;
 252                                 return GetAttributeArgumentExpression (child, loc, child.Type, out result);
 253                         }
 254
 255                         result = null;
 256                         Error_AttributeArgumentNotValid (loc);
 257                         return false;
 258                 }
 259
 260                 public CustomAttributeBuilder Resolve (EmitContext ec)
 261                 {
 262                         Type oldType = Type;
 263
 264                         // Sanity check.
 265                         Type = CheckAttributeType (ec, true);
 266
 267                         if (oldType == null && Type == null)
 268                                 return null;
 269                         if (oldType != null && oldType != Type){
 270                                 Report.Error (-27, Location,
 271                                               "Attribute {0} resolved to different types at different times: {1} vs. {2}",
 272                                               Name, oldType, Type);
 273                                 return null;
 274                         }
 275
 276                         if (Type.IsAbstract) {
 277                                 Report.Error (653, Location, "Cannot apply attribute class '{0}' because it is abstract", Name);
 278                                 return null;
 279                         }
 280
 281                         bool MethodImplAttr = false;
 282                         bool MarshalAsAttr = false;
 283                         bool GuidAttr = false;
 284                         bool usage_attr = false;
 285
 286                         bool DoCompares = true;
 287
 288                         //
 289                         // If we are a certain special attribute, we
 290                         // set the information accordingly
 291                         //
 292
 293                         if (Type == TypeManager.attribute_usage_type)
 294                                 usage_attr = true;
 295                         else if (Type == TypeManager.methodimpl_attr_type)
 296                                 MethodImplAttr = true;
 297                         else if (Type == TypeManager.marshal_as_attr_type)
 298                                 MarshalAsAttr = true;
 299                         else if (Type == TypeManager.guid_attr_type)
 300                                 GuidAttr = true;
 301                         else
 302                                 DoCompares = false;
 303
 304                         // Now we extract the positional and named arguments
 305
 306                         ArrayList pos_args = new ArrayList ();
 307                         ArrayList named_args = new ArrayList ();
 308                         int pos_arg_count = 0;
 309
 310                         if (Arguments != null) {
 311                                 pos_args = (ArrayList) Arguments [0];
 312                                 if (pos_args != null)
 313                                         pos_arg_count = pos_args.Count;
 314                                 if (Arguments.Count > 1)
 315                                         named_args = (ArrayList) Arguments [1];
 316                         }
 317
 318                         pos_values = new object [pos_arg_count];
 319
 320                         //
 321                         // First process positional arguments
 322                         //
 323
 324                         int i;
 325                         for (i = 0; i < pos_arg_count; i++) {
 326                                 Argument a = (Argument) pos_args [i];
 327                                 Expression e;
 328
 329                                 if (!a.Resolve (ec, Location))
 330                                         return null;
 331
 332                                 e = a.Expr;
 333
 334                                 object val;
 335                                 if (!GetAttributeArgumentExpression (e, Location, a.Type, out val))
 336                                         return null;
 337
 338                                 pos_values [i] = val;
 339
 340                                 if (DoCompares){
 341                                         if (usage_attr) {
 342                                                 usage_attribute = new AttributeUsageAttribute ((AttributeTargets)val);
 343                                         } else if (MethodImplAttr) {
 344                                                 this.ImplOptions = (MethodImplOptions) val;
 345                                         } else if (GuidAttr){
 346                                                 //
 347                                                 // we will later check the validity of the type
 348                                                 //
 349                                                 if (val is string){
 350                                                         if (!ValidateGuid ((string) val))
 351                                                                 return null;
 352                                                 }
 353
 354                                         } else if (MarshalAsAttr)
 355                                                 this.UnmanagedType =
 356                                                 (System.Runtime.InteropServices.UnmanagedType) val;
 357                                 }
 358                         }
 359
 360                         //
 361                         // Now process named arguments
 362                         //
 363
 364                         ArrayList field_infos = null;
 365                         ArrayList prop_infos  = null;
 366                         ArrayList field_values = null;
 367                         ArrayList prop_values = null;
 368
 369                         if (named_args.Count > 0) {
 370                                 field_infos = new ArrayList ();
 371                                 prop_infos  = new ArrayList ();
 372                                 field_values = new ArrayList ();
 373                                 prop_values = new ArrayList ();
 374                         }
 375
 376                         Hashtable seen_names = new Hashtable();
 377
 378                         for (i = 0; i < named_args.Count; i++) {
 379                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 380                                 string member_name = (string) de.Key;
 381                                 Argument a  = (Argument) de.Value;
 382                                 Expression e;
 383
 384                                 if (seen_names.Contains(member_name)) {
 385                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 386                                         return null;
 387                                 }
 388                                 seen_names.Add(member_name, 1);
 389
 390                                 if (!a.Resolve (ec, Location))
 391                                         return null;
 392
 393                                 Expression member = Expression.MemberLookup (
 394                                         ec, Type, member_name,
 395                                         MemberTypes.Field | MemberTypes.Property,
 396                                         BindingFlags.Public | BindingFlags.Instance,
 397                                         Location);
 398
 399                                 if (member == null) {
 400                                         member = Expression.MemberLookup (ec, Type, member_name,
 401                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 402                                                 Location);
 403
 404                                         if (member != null) {
 405                                                 Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", GetFullMemberName (member_name));
 406                                                 return null;
 407                                         }
 408                                 }
 409
 410                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {
 411                                         Error_InvalidNamedArgument (member_name);
 412                                         return null;
 413                                 }
 414
 415                                 e = a.Expr;
 416                                 if (member is PropertyExpr) {
 417                                         PropertyExpr pe = (PropertyExpr) member;
 418                                         PropertyInfo pi = pe.PropertyInfo;
 419
 420                                         if (!pi.CanWrite || !pi.CanRead) {
 421                                                 Report.SymbolRelatedToPreviousError (pi);
 422                                                 Error_InvalidNamedArgument (member_name);
 423                                                 return null;
 424                                         }
 425
 426                                         object value;
 427                                         if (!GetAttributeArgumentExpression (e, Location, pi.PropertyType, out value))
 428                                                 return null;
 429
 430                                         if (usage_attribute != null) {
 431                                                 if (member_name == "AllowMultiple")
 432                                                         usage_attribute.AllowMultiple = (bool) value;
 433                                                 if (member_name == "Inherited")
 434                                                         usage_attribute.Inherited = (bool) value;
 435                                         }
 436
 437                                         prop_values.Add (value);
 438                                         prop_infos.Add (pi);
 439
 440                                 } else if (member is FieldExpr) {
 441                                         FieldExpr fe = (FieldExpr) member;
 442                                         FieldInfo fi = fe.FieldInfo;
 443
 444                                         if (fi.IsInitOnly) {
 445                                                 Error_InvalidNamedArgument (member_name);
 446                                                 return null;
 447                                         }
 448
 449                                         object value;
 450                                         if (!GetAttributeArgumentExpression (e, Location, fi.FieldType, out value))
 451                                                 return null;
 452
 453                                         field_values.Add (value);
 454                                         field_infos.Add (fi);
 455                                 }
 456                         }
 457
 458                         Expression mg = Expression.MemberLookup (
 459                                 ec, Type, ".ctor", MemberTypes.Constructor,
 460                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 461                                 Location);
 462
 463                         if (mg == null) {
 464                                 Error_AttributeConstructorMismatch ();
 465                                 return null;
 466                         }
 467
 468                         MethodBase constructor = Invocation.OverloadResolve (
 469                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 470
 471                         if (constructor == null) {
 472                                 return null;
 473                         }
 474
 475                         //
 476                         // Now we perform some checks on the positional args as they
 477                         // cannot be null for a constructor which expects a parameter
 478                         // of type object
 479                         //
 480
 481                         ParameterData pd = Invocation.GetParameterData (constructor);
 482
 483                         int group_in_params_array = Int32.MaxValue;
 484                         int pc = pd.Count;
 485                         if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)
 486                                 group_in_params_array = pc-1;
 487
 488                         for (int j = 0; j < pos_arg_count; ++j) {
 489                                 Argument a = (Argument) pos_args [j];
 490
 491                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 492                                         Error_AttributeArgumentNotValid (Location);
 493                                         return null;
 494                                 }
 495
 496                                 if (j < group_in_params_array)
 497                                         continue;
 498
 499                                 if (j == group_in_params_array){
 500                                         object v = pos_values [j];
 501                                         int count = pos_arg_count - j;
 502
 503                                         object [] array = new object [count];
 504                                         pos_values [j] = array;
 505                                         array [0] = v;
 506                                 } else {
 507                                         object [] array = (object []) pos_values [group_in_params_array];
 508
 509                                         array [j - group_in_params_array] = pos_values [j];
 510                                 }
 511                         }
 512
 513                         //
 514                         // Adjust the size of the pos_values if it had params
 515                         //
 516                         if (group_in_params_array != Int32.MaxValue){
 517                                 int argc = group_in_params_array+1;
 518                                 object [] new_pos_values = new object [argc];
 519
 520                                 for (int p = 0; p < argc; p++)
 521                                         new_pos_values [p] = pos_values [p];
 522                                 pos_values = new_pos_values;
 523                         }
 524
 525                         try {
 526                                 if (named_args.Count > 0) {
 527                                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 528                                         field_info_arr = new FieldInfo [field_infos.Count];
 529                                         field_values_arr = new object [field_values.Count];
 530                                         prop_values_arr = new object [prop_values.Count];
 531
 532                                         field_infos.CopyTo  (field_info_arr, 0);
 533                                         field_values.CopyTo (field_values_arr, 0);
 534
 535                                         prop_values.CopyTo  (prop_values_arr, 0);
 536                                         prop_infos.CopyTo   (prop_info_arr, 0);
 537
 538                                         cb = new CustomAttributeBuilder (
 539                                                 (ConstructorInfo) constructor, pos_values,
 540                                                 prop_info_arr, prop_values_arr,
 541                                                 field_info_arr, field_values_arr);
 542                                 }
 543                                 else
 544                                         cb = new CustomAttributeBuilder (
 545                                                 (ConstructorInfo) constructor, pos_values);
 546                         } catch (NullReferenceException) {
 547                                 //
 548                                 // Don't know what to do here
 549                                 //
 550                                 Report.Warning (
 551                                         -101, Location, "NullReferenceException while trying to create attribute." +
 552                                         "Something's wrong!");
 553                         } catch (Exception e) {
 554                                 //
 555                                 // Sample:
 556                                 // using System.ComponentModel;
 557                                 // [DefaultValue (CollectionChangeAction.Add)]
 558                                 // class X { static void Main () {} }
 559                                 //
 560                                 Report.Warning (
 561                                         -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);
 562                         }
 563
 564                         return cb;
 565                 }
 566
 567                 /// <summary>
 568                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 569                 /// </summary>
 570                 public string GetValidTargets ()
 571                 {
 572                         StringBuilder sb = new StringBuilder ();
 573                         AttributeTargets targets = GetAttributeUsage ().ValidOn;
 574
 575                         if ((targets & AttributeTargets.Assembly) != 0)
 576                                 sb.Append ("'assembly' ");
 577
 578                         if ((targets & AttributeTargets.Class) != 0)
 579                                 sb.Append ("'class' ");
 580
 581                         if ((targets & AttributeTargets.Constructor) != 0)
 582                                 sb.Append ("'constructor' ");
 583
 584                         if ((targets & AttributeTargets.Delegate) != 0)
 585                                 sb.Append ("'delegate' ");
 586
 587                         if ((targets & AttributeTargets.Enum) != 0)
 588                                 sb.Append ("'enum' ");
 589
 590                         if ((targets & AttributeTargets.Event) != 0)
 591                                 sb.Append ("'event' ");
 592
 593                         if ((targets & AttributeTargets.Field) != 0)
 594                                 sb.Append ("'field' ");
 595
 596                         if ((targets & AttributeTargets.Interface) != 0)
 597                                 sb.Append ("'interface' ");
 598
 599                         if ((targets & AttributeTargets.Method) != 0)
 600                                 sb.Append ("'method' ");
 601
 602                         if ((targets & AttributeTargets.Module) != 0)
 603                                 sb.Append ("'module' ");
 604
 605                         if ((targets & AttributeTargets.Parameter) != 0)
 606                                 sb.Append ("'parameter' ");
 607
 608                         if ((targets & AttributeTargets.Property) != 0)
 609                                 sb.Append ("'property' ");
 610
 611                         if ((targets & AttributeTargets.ReturnValue) != 0)
 612                                 sb.Append ("'return' ");
 613
 614                         if ((targets & AttributeTargets.Struct) != 0)
 615                                 sb.Append ("'struct' ");
 616
 617                         return sb.ToString ();
 618
 619                 }
 620
 621                 /// <summary>
 622                 /// Returns AttributeUsage attribute for this type
 623                 /// </summary>
 624                 public AttributeUsageAttribute GetAttributeUsage ()
 625                 {
 626                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 627                         if (ua != null)
 628                                 return ua;
 629
 630                         Class attr_class = TypeManager.LookupClass (Type);
 631
 632                         if (attr_class == null) {
 633                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 634                                 ua = (AttributeUsageAttribute)usage_attr [0];
 635                                 usage_attr_cache.Add (Type, ua);
 636                                 return ua;
 637                         }
 638
 639                         return attr_class.AttributeUsage;
 640                 }
 641
 642                 /// <summary>
 643                 /// Returns custom name of indexer
 644                 /// </summary>
 645                 public string GetIndexerAttributeValue (EmitContext ec)
 646                 {
 647                         if (pos_values == null) {
 648                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 649                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 650                                 Resolve (ec);
 651                         }
 652
 653                         return pos_values [0] as string;
 654                 }
 655
 656                 /// <summary>
 657                 /// Returns condition of ConditionalAttribute
 658                 /// </summary>
 659                 public string GetConditionalAttributeValue (DeclSpace ds)
 660                 {
 661                         if (pos_values == null) {
 662                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 663
 664                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 665                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 666                                 Resolve (ec);
 667                         }
 668
 669                         // Some error occurred
 670                         if (pos_values [0] == null)
 671                                 return null;
 672
 673                         return (string)pos_values [0];
 674                 }
 675
 676                 /// <summary>
 677                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 678                 /// </summary>
 679                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 680                 {
 681                         if (pos_values == null) {
 682                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 683
 684                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 685                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 686                                 Resolve (ec);
 687                         }
 688
 689                         // Some error occurred
 690                         if (pos_values == null)
 691                                 return null;
 692
 693                         if (pos_values.Length == 0)
 694                                 return new ObsoleteAttribute ();
 695
 696                         if (pos_values.Length == 1)
 697                                 return new ObsoleteAttribute ((string)pos_values [0]);
 698
 699                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 700                 }
 701
 702                 /// <summary>
 703                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 704                 /// before ApplyAttribute. We need to resolve the arguments.
 705                 /// This situation occurs when class deps is differs from Emit order.
 706                 /// </summary>
 707                 public bool GetClsCompliantAttributeValue (DeclSpace ds)
 708                 {
 709                         if (pos_values == null) {
 710                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 711
 712                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 713                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 714                                 Resolve (ec);
 715                         }
 716
 717                         // Some error occurred
 718                         if (pos_values [0] == null)
 719                                 return false;
 720
 721                         return (bool)pos_values [0];
 722                 }
 723
 724                 /// <summary>
 725                 /// Tests permitted SecurityAction for assembly or other types
 726                 /// </summary>
 727                 public bool CheckSecurityActionValidity (bool for_assembly)
 728                 {
 729                         SecurityAction action  = GetSecurityActionValue ();
 730
 731                         if ((action == SecurityAction.RequestMinimum || action == SecurityAction.RequestOptional || action == SecurityAction.RequestRefuse) && for_assembly)
 732                                 return true;
 733
 734                         if (!for_assembly) {
 735                                 if (action < SecurityAction.Demand || action > SecurityAction.InheritanceDemand) {
 736                                         Error_AttributeEmitError ("SecurityAction is out of range");
 737                                         return false;
 738                                 }
 739
 740                                 if ((action != SecurityAction.RequestMinimum && action != SecurityAction.RequestOptional && action != SecurityAction.RequestRefuse) && !for_assembly)
 741                                         return true;
 742                         }
 743
 744                         Error_AttributeEmitError (String.Concat ("SecurityAction '", action, "' is not valid for this declaration"));
 745                         return false;
 746                 }
 747
 748                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 749                 {
 750                         return (SecurityAction)pos_values [0];
 751                 }
 752
 753                 /// <summary>
 754                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 755                 /// </summary>
 756                 /// <returns></returns>
 757                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 758                 {
 759                         if (TypeManager.LookupDeclSpace (Type) != null && RootContext.StdLib) {
 760                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 761                                 return;
 762                         }
 763
 764                         SecurityAttribute sa;
 765                         // For all assemblies except corlib we can avoid all hacks
 766                         if (RootContext.StdLib) {
 767                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 768
 769                                 if (prop_info_arr != null) {
 770                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 771                                                 PropertyInfo pi = prop_info_arr [i];
 772                                                 pi.SetValue (sa, prop_values_arr [i], null);
 773                                         }
 774                                 }
 775                         } else {
 776                                 Type temp_type = Type.GetType (Type.FullName);
 777                                 // HACK: All mscorlib attributes have same ctor syntax
 778                                 sa = (SecurityAttribute) Activator.CreateInstance (temp_type, new object[] { GetSecurityActionValue () } );
 779
 780                                 // All types are from newly created corlib but for invocation with old we need to convert them
 781                                 if (prop_info_arr != null) {
 782                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 783                                                 PropertyInfo emited_pi = prop_info_arr [i];
 784                                                 PropertyInfo pi = temp_type.GetProperty (emited_pi.Name, emited_pi.PropertyType);
 785
 786                                                 object old_instance = pi.PropertyType.IsEnum ?
 787                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
 788                                                         prop_values_arr [i];
 789
 790                                                 pi.SetValue (sa, old_instance, null);
 791                                         }
 792                                 }
 793                         }
 794
 795                         IPermission perm = sa.CreatePermission ();
 796                         SecurityAction action;
 797
 798                         // IS is correct because for corlib we are using an instance from old corlib
 799                         if (perm is System.Security.CodeAccessPermission) {
 800                                 action = GetSecurityActionValue ();
 801                         } else {
 802                                 switch (GetSecurityActionValue ()) {
 803                                         case SecurityAction.Demand:
 804                                                 action = (SecurityAction)13;
 805                                                 break;
 806                                         case SecurityAction.LinkDemand:
 807                                                 action = (SecurityAction)14;
 808                                                 break;
 809                                         case SecurityAction.InheritanceDemand:
 810                                                 action = (SecurityAction)15;
 811                                                 break;
 812                                         default:
 813                                                 Error_AttributeEmitError ("Invalid SecurityAction for non-Code Access Security permission");
 814                                                 return;
 815                                 }
 816                         }
 817
 818                         PermissionSet ps = (PermissionSet)permissions [action];
 819                         if (ps == null) {
 820                                 ps = new PermissionSet (PermissionState.None);
 821                                 permissions.Add (action, ps);
 822                         }
 823                         ps.AddPermission (sa.CreatePermission ());
 824                 }
 825
 826                 object GetValue (object value)
 827                 {
 828                         if (value is EnumConstant)
 829                                 return ((EnumConstant) value).GetValue ();
 830                         else
 831                                 return value;
 832                 }
 833
 834                 public object GetPositionalValue (int i)
 835                 {
 836                         return (pos_values == null) ? null : pos_values[i];
 837                 }
 838
 839                 object GetFieldValue (string name)
 840                 {
 841                         int i;
 842                         if (field_info_arr == null)
 843                                 return null;
 844                         i = 0;
 845                         foreach (FieldInfo fi in field_info_arr) {
 846                                 if (fi.Name == name)
 847                                         return GetValue (field_values_arr [i]);
 848                                 i++;
 849                         }
 850                         return null;
 851                 }
 852
 853                 public UnmanagedMarshal GetMarshal (Attributable attr)
 854                 {
 855                         object value = GetFieldValue ("SizeParamIndex");
 856                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
 857                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
 858                                 return null;
 859                         }
 860
 861                         object o = GetFieldValue ("ArraySubType");
 862                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 863
 864                         switch (UnmanagedType) {
 865                         case UnmanagedType.CustomMarshaler:
 866                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 867                                                                        BindingFlags.Static | BindingFlags.Public);
 868                                 if (define_custom == null) {
 869                                         Report.RuntimeMissingSupport (Location, "set marshal info");
 870                                         return null;
 871                                 }
 872
 873                                 object [] args = new object [4];
 874                                 args [0] = GetFieldValue ("MarshalTypeRef");
 875                                 args [1] = GetFieldValue ("MarshalCookie");
 876                                 args [2] = GetFieldValue ("MarshalType");
 877                                 args [3] = Guid.Empty;
 878                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 879
 880                         case UnmanagedType.LPArray:
 881                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 882
 883                         case UnmanagedType.SafeArray:
 884                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 885
 886                         case UnmanagedType.ByValArray:
 887                                 FieldMember fm = attr as FieldMember;
 888                                 if (fm == null) {
 889                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
 890                                         return null;
 891                                 }
 892                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 893
 894                         case UnmanagedType.ByValTStr:
 895                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 896
 897                         default:
 898                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 899                         }
 900                 }
 901
 902                 public bool IsInternalCall
 903                 {
 904                         get { return ImplOptions == MethodImplOptions.InternalCall; }
 905                 }
 906
 907                 /// <summary>
 908                 /// Emit attribute for Attributable symbol
 909                 /// </summary>
 910                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 911                 {
 912                         CustomAttributeBuilder cb = Resolve (ec);
 913                         if (cb == null)
 914                                 return;
 915
 916                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
 917                         if ((usage_attr.ValidOn & Target) == 0) {
 918                                 Report.Error (592, Location, "Attribute '{0}' is not valid on this declaration type. It is valid on {1} declarations only.", Name, GetValidTargets ());
 919                                 return;
 920                         }
 921
 922                         ias.ApplyAttributeBuilder (this, cb);
 923
 924                         if (!usage_attr.AllowMultiple) {
 925                                 ArrayList emitted_targets = (ArrayList)emitted_attr [Type];
 926                                 if (emitted_targets == null) {
 927                                         emitted_targets = new ArrayList ();
 928                                         emitted_attr.Add (Type, emitted_targets);
 929                                 } else if (emitted_targets.Contains (Target)) {
 930                                         Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
 931                                         return;
 932                                 }
 933                                 emitted_targets.Add (Target);
 934                         }
 935
 936                         if (!RootContext.VerifyClsCompliance)
 937                                 return;
 938
 939                         // Here we are testing attribute arguments for array usage (error 3016)
 940                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
 941                                 if (Arguments == null)
 942                                         return;
 943
 944                                 ArrayList pos_args = (ArrayList) Arguments [0];
 945                                 if (pos_args != null) {
 946                                         foreach (Argument arg in pos_args) {
 947                                                 // Type is undefined (was error 246)
 948                                                 if (arg.Type == null)
 949                                                         return;
 950
 951                                                 if (arg.Type.IsArray) {
 952                                                         Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 953                                                         return;
 954                                                 }
 955                                         }
 956                                 }
 957
 958                                 if (Arguments.Count < 2)
 959                                         return;
 960
 961                                 ArrayList named_args = (ArrayList) Arguments [1];
 962                                 foreach (DictionaryEntry de in named_args) {
 963                                         Argument arg  = (Argument) de.Value;
 964
 965                                         // Type is undefined (was error 246)
 966                                         if (arg.Type == null)
 967                                                 return;
 968
 969                                         if (arg.Type.IsArray) {
 970                                                 Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 971                                                 return;
 972                                         }
 973                                 }
 974                         }
 975                 }
 976
 977                 public object GetValue (EmitContext ec, Constant c, Type target)
 978                 {
 979                         if (Convert.ImplicitConversionExists (ec, c, target))
 980                                 return c.GetValue ();
 981
 982                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
 983                         return null;
 984                 }
 985
 986                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
 987                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
 988                 {
 989                         //
 990                         // We extract from the attribute the information we need
 991                         //
 992
 993                         if (Arguments == null) {
 994                                 Console.WriteLine ("Internal error : this is not supposed to happen !");
 995                                 return null;
 996                         }
 997
 998                         ResolveType (ec, true);
 999                         if (Type == null)
1000                                 return null;
1001
1002                         ArrayList named_args = new ArrayList ();
1003
1004                         ArrayList pos_args = (ArrayList) Arguments [0];
1005                         if (Arguments.Count > 1)
1006                                 named_args = (ArrayList) Arguments [1];
1007
1008
1009                         string dll_name = null;
1010
1011                         Argument tmp = (Argument) pos_args [0];
1012
1013                         if (!tmp.Resolve (ec, Location))
1014                                 return null;
1015
1016                         if (tmp.Expr is Constant)
1017                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();
1018                         else {
1019                                 Error_AttributeArgumentNotValid (Location);
1020                                 return null;
1021                         }
1022
1023                         // Now we process the named arguments
1024                         CallingConvention cc = CallingConvention.Winapi;
1025                         CharSet charset = CharSet.Ansi;
1026                         bool preserve_sig = true;
1027 #if FIXME
1028                         bool exact_spelling = false;
1029 #endif
1030                         bool set_last_err = false;
1031                         string entry_point = null;
1032
1033                         for (int i = 0; i < named_args.Count; i++) {
1034
1035                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
1036
1037                                 string member_name = (string) de.Key;
1038                                 Argument a  = (Argument) de.Value;
1039
1040                                 if (!a.Resolve (ec, Location))
1041                                         return null;
1042
1043                                 Expression member = Expression.MemberLookup (
1044                                         ec, Type, member_name,
1045                                         MemberTypes.Field | MemberTypes.Property,
1046                                         BindingFlags.Public | BindingFlags.Instance,
1047                                         Location);
1048
1049                                 if (member == null || !(member is FieldExpr)) {
1050                                         Error_InvalidNamedArgument (member_name);
1051                                         return null;
1052                                 }
1053
1054                                 if (member is FieldExpr) {
1055                                         FieldExpr fe = (FieldExpr) member;
1056                                         FieldInfo fi = fe.FieldInfo;
1057
1058                                         if (fi.IsInitOnly) {
1059                                                 Error_InvalidNamedArgument (member_name);
1060                                                 return null;
1061                                         }
1062
1063                                         if (a.Expr is Constant) {
1064                                                 Constant c = (Constant) a.Expr;
1065
1066                                                 try {
1067                                                         if (member_name == "CallingConvention"){
1068                                                                 object val = GetValue (ec, c, typeof (CallingConvention));
1069                                                                 if (val == null)
1070                                                                         return null;
1071                                                                 cc = (CallingConvention) val;
1072                                                         } else if (member_name == "CharSet"){
1073                                                                 charset = (CharSet) c.GetValue ();
1074                                                         } else if (member_name == "EntryPoint")
1075                                                                 entry_point = (string) c.GetValue ();
1076                                                         else if (member_name == "SetLastError")
1077                                                                 set_last_err = (bool) c.GetValue ();
1078 #if FIXME
1079                                                         else if (member_name == "ExactSpelling")
1080                                                                 exact_spelling = (bool) c.GetValue ();
1081 #endif
1082                                                         else if (member_name == "PreserveSig")
1083                                                                 preserve_sig = (bool) c.GetValue ();
1084                                                 } catch (InvalidCastException){
1085                                                         Error_InvalidNamedArgument (member_name);
1086                                                         Error_AttributeArgumentNotValid (Location);
1087                                                 }
1088                                         } else {
1089                                                 Error_AttributeArgumentNotValid (Location);
1090                                                 return null;
1091                                         }
1092
1093                                 }
1094                         }
1095
1096                         if (entry_point == null)
1097                                 entry_point = name;
1098                         if (set_last_err)
1099                                 charset = (CharSet)((int)charset | 0x40);
1100
1101                         MethodBuilder mb = builder.DefinePInvokeMethod (
1102                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,
1103                                 CallingConventions.Standard,
1104                                 ret_type,
1105                                 param_types,
1106                                 cc,
1107                                 charset);
1108
1109                         if (preserve_sig)
1110                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
1111
1112                         return mb;
1113                 }
1114
1115                 private Expression GetValue ()
1116                 {
1117                         if ((Arguments == null) || (Arguments.Count < 1))
1118                                 return null;
1119                         ArrayList al = (ArrayList) Arguments [0];
1120                         if ((al == null) || (al.Count < 1))
1121                                 return null;
1122                         Argument arg = (Argument) al [0];
1123                         if ((arg == null) || (arg.Expr == null))
1124                                 return null;
1125                         return arg.Expr;
1126                 }
1127
1128                 public string GetString ()
1129                 {
1130                         Expression e = GetValue ();
1131                         if (e is StringLiteral)
1132                                 return (e as StringLiteral).Value;
1133                         return null;
1134                 }
1135
1136                 public bool GetBoolean ()
1137                 {
1138                         Expression e = GetValue ();
1139                         if (e is BoolLiteral)
1140                                 return (e as BoolLiteral).Value;
1141                         return false;
1142                 }
1143         }
1144
1145
1146         /// <summary>
1147         /// For global attributes (assembly, module) we need special handling.
1148         /// Attributes can be located in the several files
1149         /// </summary>
1150         public class GlobalAttribute: Attribute
1151         {
1152                 public readonly NamespaceEntry ns;
1153
1154                 public GlobalAttribute (TypeContainer container, string target, string name, ArrayList args, Location loc):
1155                         base (target, name, args, loc)
1156                 {
1157                         ns = container.NamespaceEntry;
1158                 }
1159
1160                 protected override Type CheckAttributeType (EmitContext ec, bool complain)
1161                 {
1162                         NamespaceEntry old = ec.DeclSpace.NamespaceEntry;
1163                         if (old == null || old.NS == null || old.NS == Namespace.Root)
1164                                 ec.DeclSpace.NamespaceEntry = ns;
1165                         return base.CheckAttributeType (ec, complain);
1166                 }
1167         }
1168
1169         public class Attributes {
1170                 public ArrayList Attrs;
1171
1172                 public Attributes (Attribute a)
1173                 {
1174                         Attrs = new ArrayList ();
1175                         Attrs.Add (a);
1176                 }
1177
1178                 public Attributes (ArrayList attrs)
1179                 {
1180                         Attrs = attrs;
1181                 }
1182
1183                 public void AddAttributes (ArrayList attrs)
1184                 {
1185                         Attrs.AddRange (attrs);
1186                 }
1187
1188                 /// <summary>
1189                 /// Checks whether attribute target is valid for the current element
1190                 /// </summary>
1191                 public bool CheckTargets (Attributable member)
1192                 {
1193                         string[] valid_targets = member.ValidAttributeTargets;
1194                         foreach (Attribute a in Attrs) {
1195                                 if (a.ExplicitTarget == null || a.ExplicitTarget == valid_targets [0]) {
1196                                         a.Target = member.AttributeTargets;
1197                                         continue;
1198                                 }
1199
1200                                 // TODO: we can skip the first item
1201                                 if (((IList) valid_targets).Contains (a.ExplicitTarget)) {
1202                                         switch (a.ExplicitTarget) {
1203                                                 case "return": a.Target = AttributeTargets.ReturnValue; continue;
1204                                                 case "param": a.Target = AttributeTargets.Parameter; continue;
1205                                                 case "field": a.Target = AttributeTargets.Field; continue;
1206                                                 case "method": a.Target = AttributeTargets.Method; continue;
1207                                                 case "property": a.Target = AttributeTargets.Property; continue;
1208                                         }
1209                                         throw new InternalErrorException ("Unknown explicit target: " + a.ExplicitTarget);
1210                                 }
1211
1212                                 StringBuilder sb = new StringBuilder ();
1213                                 foreach (string s in valid_targets) {
1214                                         sb.Append (s);
1215                                         sb.Append (", ");
1216                                 }
1217                                 sb.Remove (sb.Length - 2, 2);
1218                                 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 ());
1219                                 return false;
1220                         }
1221                         return true;
1222                 }
1223
1224                 private Attribute Search (Type t, EmitContext ec, bool complain)
1225                 {
1226                         foreach (Attribute a in Attrs) {
1227                                 if (a.ResolveType (ec, complain) == t)
1228                                         return a;
1229                         }
1230                         return null;
1231                 }
1232
1233                 public Attribute Search (Type t, EmitContext ec)
1234                 {
1235                         return Search (t, ec, true);
1236                 }
1237
1238                 /// <summary>
1239                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1240                 /// </summary>
1241                 public Attribute[] SearchMulti (Type t, EmitContext ec)
1242                 {
1243                         ArrayList ar = null;
1244
1245                         foreach (Attribute a in Attrs) {
1246                                 if (a.ResolveType (ec, false) == t) {
1247                                         if (ar == null)
1248                                                 ar = new ArrayList ();
1249                                         ar.Add (a);
1250                                 }
1251                         }
1252
1253                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1254                 }
1255
1256                 public void Emit (EmitContext ec, Attributable ias)
1257                 {
1258                         if (!CheckTargets (ias))
1259                                 return;
1260
1261                         ListDictionary ld = new ListDictionary ();
1262
1263                         foreach (Attribute a in Attrs)
1264                                 a.Emit (ec, ias, ld);
1265                 }
1266
1267                 public bool Contains (Type t, EmitContext ec)
1268                 {
1269                         return Search (t, ec) != null;
1270                 }
1271
1272                 public Attribute GetClsCompliantAttribute (EmitContext ec)
1273                 {
1274                         return Search (TypeManager.cls_compliant_attribute_type, ec, false);
1275                 }
1276
1277                 /// <summary>
1278                 /// Pulls the IndexerName attribute from an Indexer if it exists.
1279                 /// </summary>
1280                 public Attribute GetIndexerNameAttribute (EmitContext ec)
1281                 {
1282                         Attribute a = Search (TypeManager.indexer_name_type, ec, false);
1283                         if (a == null)
1284                                 return null;
1285
1286                         // Remove the attribute from the list because it is not emitted
1287                         Attrs.Remove (a);
1288                         return a;
1289                 }
1290
1291         }
1292
1293         /// <summary>
1294         /// Helper class for attribute verification routine.
1295         /// </summary>
1296         sealed class AttributeTester
1297         {
1298                 static PtrHashtable analyzed_types = new PtrHashtable ();
1299                 static PtrHashtable analyzed_types_obsolete = new PtrHashtable ();
1300                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1301                 static PtrHashtable analyzed_method_excluded = new PtrHashtable ();
1302
1303                 private AttributeTester ()
1304                 {
1305                 }
1306
1307                 /// <summary>
1308                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1309                 /// It tests differing only in ref or out, or in array rank.
1310                 /// </summary>
1311                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1312                 {
1313                         if (types_a == null || types_b == null)
1314                                 return true;
1315
1316                         if (types_a.Length != types_b.Length)
1317                                 return true;
1318
1319                         for (int i = 0; i < types_b.Length; ++i) {
1320                                 Type aType = types_a [i];
1321                                 Type bType = types_b [i];
1322
1323                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1324                                         return false;
1325                                 }
1326
1327                                 Type aBaseType = aType;
1328                                 bool is_either_ref_or_out = false;
1329
1330                                 if (aType.IsByRef || aType.IsPointer) {
1331                                         aBaseType = aType.GetElementType ();
1332                                         is_either_ref_or_out = true;
1333                                 }
1334
1335                                 Type bBaseType = bType;
1336                                 if (bType.IsByRef || bType.IsPointer)
1337                                 {
1338                                         bBaseType = bType.GetElementType ();
1339                                         is_either_ref_or_out = !is_either_ref_or_out;
1340                                 }
1341
1342                                 if (aBaseType != bBaseType)
1343                                         continue;
1344
1345                                 if (is_either_ref_or_out)
1346                                         return false;
1347                         }
1348                         return true;
1349                 }
1350
1351                 /// <summary>
1352                 /// Goes through all parameters and test if they are CLS-Compliant.
1353                 /// </summary>
1354                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1355                 {
1356                         if (fixedParameters == null)
1357                                 return true;
1358
1359                         foreach (Parameter arg in fixedParameters) {
1360                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1361                                         Report.Error (3001, loc, "Argument type '{0}' is not CLS-compliant", arg.GetSignatureForError ());
1362                                         return false;
1363                                 }
1364                         }
1365                         return true;
1366                 }
1367
1368
1369                 /// <summary>
1370                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1371                 /// </summary>
1372                 public static bool IsClsCompliant (Type type)
1373                 {
1374                         if (type == null)
1375                                 return true;
1376
1377                         object type_compliance = analyzed_types[type];
1378                         if (type_compliance != null)
1379                                 return type_compliance == TRUE;
1380
1381                         if (type.IsPointer) {
1382                                 analyzed_types.Add (type, null);
1383                                 return false;
1384                         }
1385
1386                         bool result;
1387                         if (type.IsArray || type.IsByRef)       {
1388                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1389                         } else {
1390                                 result = AnalyzeTypeCompliance (type);
1391                         }
1392                         analyzed_types.Add (type, result ? TRUE : FALSE);
1393                         return result;
1394                 }
1395
1396                 static object TRUE = new object ();
1397                 static object FALSE = new object ();
1398
1399                 public static void VerifyModulesClsCompliance ()
1400                 {
1401                         Module[] modules = TypeManager.Modules;
1402                         if (modules == null)
1403                                 return;
1404
1405                         // The first module is generated assembly
1406                         for (int i = 1; i < modules.Length; ++i) {
1407                                 Module module = modules [i];
1408                                 if (!IsClsCompliant (module)) {
1409                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute to match the assembly", module.Name);
1410                                         return;
1411                                 }
1412                         }
1413                 }
1414
1415                 /// <summary>
1416                 /// Tests container name for CLS-Compliant name (differing only in case)
1417                 /// </summary>
1418                 public static void VerifyTopLevelNameClsCompliance ()
1419                 {
1420                         Hashtable locase_table = new Hashtable ();
1421
1422                         // Convert imported type names to lower case and ignore not cls compliant
1423                         foreach (DictionaryEntry de in TypeManager.all_imported_types) {
1424                                 Type t = (Type)de.Value;
1425                                 if (!AttributeTester.IsClsCompliant (t))
1426                                         continue;
1427
1428                                 locase_table.Add (((string)de.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture), t);
1429                         }
1430
1431                         foreach (DictionaryEntry de in RootContext.Tree.Decls) {
1432                                 DeclSpace decl = (DeclSpace)de.Value;
1433                                 if (!decl.IsClsCompliaceRequired (decl))
1434                                         continue;
1435
1436                                 string lcase = decl.Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1437                                 if (!locase_table.Contains (lcase)) {
1438                                         locase_table.Add (lcase, decl);
1439                                         continue;
1440                                 }
1441
1442                                 object conflict = locase_table [lcase];
1443                                 if (conflict is Type)
1444                                         Report.SymbolRelatedToPreviousError ((Type)conflict);
1445                                 else
1446                                         Report.SymbolRelatedToPreviousError ((MemberCore)conflict);
1447
1448                                 Report.Error (3005, decl.Location, "Identifier '{0}' differing only in case is not CLS-compliant", decl.GetSignatureForError ());
1449                         }
1450                 }
1451
1452                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1453                 {
1454                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1455                         if (CompliantAttribute.Length == 0)
1456                                 return false;
1457
1458                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1459                 }
1460
1461                 static bool AnalyzeTypeCompliance (Type type)
1462                 {
1463                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1464                         if (ds != null) {
1465                                 return ds.IsClsCompliaceRequired (ds.Parent);
1466                         }
1467
1468                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1469                         if (CompliantAttribute.Length == 0)
1470                                 return IsClsCompliant (type.Assembly);
1471
1472                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1473                 }
1474
1475                 /// <summary>
1476                 /// Returns instance of ObsoleteAttribute when type is obsolete
1477                 /// </summary>
1478                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1479                 {
1480                         object type_obsolete = analyzed_types_obsolete [type];
1481                         if (type_obsolete == FALSE)
1482                                 return null;
1483
1484                         if (type_obsolete != null)
1485                                 return (ObsoleteAttribute)type_obsolete;
1486
1487                         ObsoleteAttribute result = null;
1488                         if (type.IsByRef || type.IsArray || type.IsPointer) {
1489                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1490                         } else {
1491                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1492
1493                                 // Type is external, we can get attribute directly
1494                                 if (type_ds == null) {
1495                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1496                                         if (attribute.Length == 1)
1497                                                 result = (ObsoleteAttribute)attribute [0];
1498                                 } else {
1499                                         result = type_ds.GetObsoleteAttribute (type_ds);
1500                                 }
1501                         }
1502
1503                         analyzed_types_obsolete.Add (type, result == null ? FALSE : result);
1504                         return result;
1505                 }
1506
1507                 /// <summary>
1508                 /// Returns instance of ObsoleteAttribute when method is obsolete
1509                 /// </summary>
1510                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1511                 {
1512                         IMethodData mc = TypeManager.GetMethod (mb);
1513                         if (mc != null)
1514                                 return mc.GetObsoleteAttribute ();
1515
1516                         // compiler generated methods are not registered by AddMethod
1517                         if (mb.DeclaringType is TypeBuilder)
1518                                 return null;
1519
1520                         return GetMemberObsoleteAttribute (mb);
1521                 }
1522
1523                 /// <summary>
1524                 /// Returns instance of ObsoleteAttribute when member is obsolete
1525                 /// </summary>
1526                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1527                 {
1528                         object type_obsolete = analyzed_member_obsolete [mi];
1529                         if (type_obsolete == FALSE)
1530                                 return null;
1531
1532                         if (type_obsolete != null)
1533                                 return (ObsoleteAttribute)type_obsolete;
1534
1535                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1536                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1537                         return oa;
1538                 }
1539
1540                 /// <summary>
1541                 /// Common method for Obsolete error/warning reporting.
1542                 /// </summary>
1543                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1544                 {
1545                         if (oa.IsError) {
1546                                 Report.Error (619, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1547                                 return;
1548                         }
1549
1550                         if (oa.Message == null) {
1551                                 Report.Warning (612, loc, "'{0}' is obsolete", member);
1552                                 return;
1553                         }
1554                         if (RootContext.WarningLevel >= 2)
1555                                 Report.Warning (618, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1556                 }
1557
1558                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1559                 {
1560                         object excluded = analyzed_method_excluded [mb];
1561                         if (excluded != null)
1562                                 return excluded == TRUE ? true : false;
1563
1564                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true) as ConditionalAttribute[];
1565                         if (attrs.Length == 0) {
1566                                 analyzed_method_excluded.Add (mb, FALSE);
1567                                 return false;
1568                         }
1569
1570                         foreach (ConditionalAttribute a in attrs) {
1571                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1572                                         analyzed_method_excluded.Add (mb, FALSE);
1573                                         return false;
1574                                 }
1575                         }
1576                         analyzed_method_excluded.Add (mb, TRUE);
1577                         return true;
1578                 }
1579         }
1580 }