mcs/mcs/import.cs

   1 //
   2 // import.cs: System.Reflection conversions
   3 //
   4 // Authors: Marek Safar (marek.safar@gmail.com)
   5 //
   6 // Dual licensed under the terms of the MIT X11 or GNU GPL
   7 //
   8 // Copyright 2009, 2010 Novell, Inc
   9 //
  10
  11 using System;
  12 using System.Runtime.CompilerServices;
  13 using System.Linq;
  14 using System.Collections.Generic;
  15
  16 #if STATIC
  17 using MetaType = IKVM.Reflection.Type;
  18 using IKVM.Reflection;
  19 using IKVM.Reflection.Emit;
  20 #else
  21 using MetaType = System.Type;
  22 using System.Reflection;
  23 using System.Reflection.Emit;
  24 #endif
  25
  26 namespace Mono.CSharp
  27 {
  28         public abstract class MetadataImporter
  29         {
  30                 //
  31                 // Dynamic types reader with additional logic to reconstruct a dynamic
  32                 // type using DynamicAttribute values
  33                 //
  34                 struct DynamicTypeReader
  35                 {
  36                         static readonly bool[] single_attribute = { true };
  37
  38                         public int Position;
  39                         bool[] flags;
  40
  41                         // There is no common type for CustomAttributeData and we cannot
  42                         // use ICustomAttributeProvider
  43                         object provider;
  44
  45                         //
  46                         // A member provider which can be used to get CustomAttributeData
  47                         //
  48                         public DynamicTypeReader (object provider)
  49                         {
  50                                 Position = 0;
  51                                 flags = null;
  52                                 this.provider = provider;
  53                         }
  54
  55                         //
  56                         // Returns true when object at local position has dynamic attribute flag
  57                         //
  58                         public bool IsDynamicObject (MetadataImporter importer)
  59                         {
  60                                 if (provider != null)
  61                                         ReadAttribute (importer);
  62
  63                                 return flags != null && Position < flags.Length && flags[Position];
  64                         }
  65
  66                         //
  67                         // Returns true when DynamicAttribute exists
  68                         //
  69                         public bool HasDynamicAttribute (MetadataImporter importer)
  70                         {
  71                                 if (provider != null)
  72                                         ReadAttribute (importer);
  73
  74                                 return flags != null;
  75                         }
  76
  77                         void ReadAttribute (MetadataImporter importer)
  78                         {
  79                                 IList<CustomAttributeData> cad;
  80                                 if (provider is MemberInfo) {
  81                                         cad = CustomAttributeData.GetCustomAttributes ((MemberInfo) provider);
  82                                 } else if (provider is ParameterInfo) {
  83                                         cad = CustomAttributeData.GetCustomAttributes ((ParameterInfo) provider);
  84                                 } else {
  85                                         provider = null;
  86                                         return;
  87                                 }
  88
  89                                 if (cad.Count > 0) {
  90                                         string ns, name;
  91                                         foreach (var ca in cad) {
  92                                                 importer.GetCustomAttributeTypeName (ca, out ns, out name);
  93                                                 if (name != "DynamicAttribute" && ns != CompilerServicesNamespace)
  94                                                         continue;
  95
  96                                                 if (ca.ConstructorArguments.Count == 0) {
  97                                                         flags = single_attribute;
  98                                                         break;
  99                                                 }
 100
 101                                                 var arg_type = ca.ConstructorArguments[0].ArgumentType;
 102
 103                                                 if (arg_type.IsArray && MetaType.GetTypeCode (arg_type.GetElementType ()) == TypeCode.Boolean) {
 104                                                         var carg = (IList<CustomAttributeTypedArgument>) ca.ConstructorArguments[0].Value;
 105                                                         flags = new bool[carg.Count];
 106                                                         for (int i = 0; i < flags.Length; ++i) {
 107                                                                 if (MetaType.GetTypeCode (carg[i].ArgumentType) == TypeCode.Boolean)
 108                                                                         flags[i] = (bool) carg[i].Value;
 109                                                         }
 110
 111                                                         break;
 112                                                 }
 113                                         }
 114                                 }
 115
 116                                 provider = null;
 117                         }
 118                 }
 119
 120                 protected readonly Dictionary<MetaType, TypeSpec> import_cache;
 121                 protected readonly Dictionary<MetaType, TypeSpec> compiled_types;
 122                 protected readonly Dictionary<Assembly, IAssemblyDefinition> assembly_2_definition;
 123
 124                 public static readonly string CompilerServicesNamespace = "System.Runtime.CompilerServices";
 125
 126                 protected MetadataImporter ()
 127                 {
 128                         import_cache = new Dictionary<MetaType, TypeSpec> (1024, ReferenceEquality<MetaType>.Default);
 129                         compiled_types = new Dictionary<MetaType, TypeSpec> (40, ReferenceEquality<MetaType>.Default);
 130                         assembly_2_definition = new Dictionary<Assembly, IAssemblyDefinition> (ReferenceEquality<Assembly>.Default);
 131                         IgnorePrivateMembers = true;
 132                 }
 133
 134                 #region Properties
 135
 136                 public ICollection<IAssemblyDefinition> Assemblies {
 137                         get {
 138                                 return assembly_2_definition.Values;
 139                         }
 140                 }
 141
 142                 public bool IgnorePrivateMembers { get; set; }
 143
 144                 #endregion
 145
 146                 public abstract void AddCompiledType (TypeBuilder builder, TypeSpec spec);
 147                 protected abstract MemberKind DetermineKindFromBaseType (MetaType baseType);
 148                 protected abstract bool HasVolatileModifier (MetaType[] modifiers);
 149                 public abstract void GetCustomAttributeTypeName (CustomAttributeData cad, out string typeNamespace, out string typeName);
 150
 151                 public FieldSpec CreateField (FieldInfo fi, TypeSpec declaringType)
 152                 {
 153                         Modifiers mod = 0;
 154                         var fa = fi.Attributes;
 155                         switch (fa & FieldAttributes.FieldAccessMask) {
 156                                 case FieldAttributes.Public:
 157                                         mod = Modifiers.PUBLIC;
 158                                         break;
 159                                 case FieldAttributes.Assembly:
 160                                         mod = Modifiers.INTERNAL;
 161                                         break;
 162                                 case FieldAttributes.Family:
 163                                         mod = Modifiers.PROTECTED;
 164                                         break;
 165                                 case FieldAttributes.FamORAssem:
 166                                         mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 167                                         break;
 168                                 default:
 169                                         // Ignore private fields (even for error reporting) to not require extra dependencies
 170                                         if (IgnorePrivateMembers || HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "CompilerGeneratedAttribute", CompilerServicesNamespace))
 171                                                 return null;
 172
 173                                         mod = Modifiers.PRIVATE;
 174                                         break;
 175                         }
 176
 177                         TypeSpec field_type;
 178
 179                         try {
 180                                 field_type = ImportType (fi.FieldType, new DynamicTypeReader (fi));
 181                         } catch (Exception e) {
 182                                 // TODO: I should construct fake TypeSpec based on TypeRef signature
 183                                 // but there is no way to do it with System.Reflection
 184                                 throw new InternalErrorException (e, "Cannot import field `{0}.{1}' referenced in assembly `{2}'",
 185                                         declaringType.GetSignatureForError (), fi.Name, declaringType.MemberDefinition.DeclaringAssembly);
 186                         }
 187
 188                         var definition = new ImportedMemberDefinition (fi, field_type, this);
 189
 190                         if ((fa & FieldAttributes.Literal) != 0) {
 191                                 var c = Constant.CreateConstantFromValue (field_type, fi.GetRawConstantValue (), Location.Null);
 192                                 return new ConstSpec (declaringType, definition, field_type, fi, mod, c);
 193                         }
 194
 195                         if ((fa & FieldAttributes.InitOnly) != 0) {
 196                                 if (field_type == TypeManager.decimal_type) {
 197                                         var dc = ReadDecimalConstant (CustomAttributeData.GetCustomAttributes (fi));
 198                                         if (dc != null)
 199                                                 return new ConstSpec (declaringType, definition, field_type, fi, mod, dc);
 200                                 }
 201
 202                                 mod |= Modifiers.READONLY;
 203                         } else {
 204                                 var req_mod = fi.GetRequiredCustomModifiers ();
 205                                 if (req_mod.Length > 0 && HasVolatileModifier (req_mod))
 206                                         mod |= Modifiers.VOLATILE;
 207                         }
 208
 209                         if ((fa & FieldAttributes.Static) != 0) {
 210                                 mod |= Modifiers.STATIC;
 211                         } else {
 212                                 // Fixed buffers cannot be static
 213                                 if (declaringType.IsStruct && field_type.IsStruct && field_type.IsNested &&
 214                                         HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "FixedBufferAttribute", CompilerServicesNamespace)) {
 215
 216                                         // TODO: Sanity check on field_type (only few type are allowed)
 217                                         var element_field = CreateField (fi.FieldType.GetField (FixedField.FixedElementName), declaringType);
 218                                         return new FixedFieldSpec (declaringType, definition, fi, element_field, mod);
 219                                 }
 220                         }
 221
 222                         return new FieldSpec (declaringType, definition, field_type, fi, mod);
 223                 }
 224
 225                 public EventSpec CreateEvent (EventInfo ei, TypeSpec declaringType, MethodSpec add, MethodSpec remove)
 226                 {
 227                         add.IsAccessor = true;
 228                         remove.IsAccessor = true;
 229
 230                         if (add.Modifiers != remove.Modifiers)
 231                                 throw new NotImplementedException ("Different accessor modifiers " + ei.Name);
 232
 233                         var event_type = ImportType (ei.EventHandlerType, new DynamicTypeReader (ei));
 234                         var definition = new ImportedMemberDefinition (ei, event_type,  this);
 235                         return new EventSpec (declaringType, definition, event_type, add.Modifiers, add, remove);
 236                 }
 237
 238                 TypeParameterSpec[] CreateGenericParameters (MetaType type, TypeSpec declaringType)
 239                 {
 240                         var tparams = type.GetGenericArguments ();
 241
 242                         int parent_owned_count;
 243                         if (type.IsNested) {
 244                                 parent_owned_count = type.DeclaringType.GetGenericArguments ().Length;
 245
 246                                 //
 247                                 // System.Reflection duplicates parent type parameters for each
 248                                 // nested type with slightly modified properties (eg. different owner)
 249                                 // This just makes things more complicated (think of cloned constraints)
 250                                 // therefore we remap any nested type owned by parent using `type_cache'
 251                                 // to the single TypeParameterSpec
 252                                 //
 253                                 if (declaringType != null && parent_owned_count > 0) {
 254                                         int read_count = 0;
 255                                         while (read_count != parent_owned_count) {
 256                                                 var tparams_count = declaringType.Arity;
 257                                                 if (tparams_count != 0) {
 258                                                         var parent_tp = declaringType.MemberDefinition.TypeParameters;
 259                                                         read_count += tparams_count;
 260                                                         for (int i = 0; i < tparams_count; i++) {
 261                                                                 import_cache.Add (tparams[parent_owned_count - read_count + i], parent_tp[i]);
 262                                                         }
 263                                                 }
 264
 265                                                 declaringType = declaringType.DeclaringType;
 266                                         }
 267                                 }
 268                         } else {
 269                                 parent_owned_count = 0;
 270                         }
 271
 272                         if (tparams.Length - parent_owned_count == 0)
 273                                 return null;
 274
 275                         return CreateGenericParameters (parent_owned_count, tparams);
 276                 }
 277
 278                 TypeParameterSpec[] CreateGenericParameters (int first, MetaType[] tparams)
 279                 {
 280                         var tspec = new TypeParameterSpec[tparams.Length - first];
 281                         for (int pos = first; pos < tparams.Length; ++pos) {
 282                                 var type = tparams[pos];
 283                                 int index = pos - first;
 284
 285                                 tspec [index] = (TypeParameterSpec) CreateType (type, new DynamicTypeReader (), false);
 286                         }
 287
 288                         return tspec;
 289                 }
 290
 291                 TypeSpec[] CreateGenericArguments (int first, MetaType[] tparams, DynamicTypeReader dtype)
 292                 {
 293                         ++dtype.Position;
 294
 295                         var tspec = new TypeSpec [tparams.Length - first];
 296                         for (int pos = first; pos < tparams.Length; ++pos) {
 297                                 var type = tparams[pos];
 298                                 int index = pos - first;
 299
 300                                 TypeSpec spec;
 301                                 if (type.HasElementType) {
 302                                         var element = type.GetElementType ();
 303                                         ++dtype.Position;
 304                                         spec = ImportType (element, dtype);
 305
 306                                         if (!type.IsArray) {
 307                                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
 308                                         }
 309
 310                                         spec = ArrayContainer.MakeType (spec, type.GetArrayRank ());
 311                                 } else {
 312                                         spec = CreateType (type, dtype, true);
 313
 314                                         //
 315                                         // We treat nested generic types as inflated internally where
 316                                         // reflection uses type definition
 317                                         //
 318                                         // class A<T> {
 319                                         //    IFoo<A<T>> foo;   // A<T> is definition in this case
 320                                         // }
 321                                         //
 322                                         // TODO: Is full logic from CreateType needed here as well?
 323                                         //
 324                                         if (!IsMissingType (type) && type.IsGenericTypeDefinition) {
 325                                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 326                                                 spec = spec.MakeGenericType (targs);
 327                                         }
 328                                 }
 329
 330                                 ++dtype.Position;
 331                                 tspec[index] = spec;
 332                         }
 333
 334                         return tspec;
 335                 }
 336
 337                 public MethodSpec CreateMethod (MethodBase mb, TypeSpec declaringType)
 338                 {
 339                         Modifiers mod = ReadMethodModifiers (mb, declaringType);
 340                         TypeParameterSpec[] tparams;
 341
 342                         var parameters = CreateParameters (declaringType, mb.GetParameters (), mb);
 343
 344                         if (mb.IsGenericMethod) {
 345                                 if (!mb.IsGenericMethodDefinition)
 346                                         throw new NotSupportedException ("assert");
 347
 348                                 tparams = CreateGenericParameters (0, mb.GetGenericArguments ());
 349                         } else {
 350                                 tparams = null;
 351                         }
 352
 353                         MemberKind kind;
 354                         TypeSpec returnType;
 355                         if (mb.MemberType == MemberTypes.Constructor) {
 356                                 kind = MemberKind.Constructor;
 357                                 returnType = TypeManager.void_type;
 358                         } else {
 359                                 //
 360                                 // Detect operators and destructors
 361                                 //
 362                                 string name = mb.Name;
 363                                 kind = MemberKind.Method;
 364                                 if (tparams == null && !mb.DeclaringType.IsInterface && name.Length > 6) {
 365                                         if ((mod & (Modifiers.STATIC | Modifiers.PUBLIC)) == (Modifiers.STATIC | Modifiers.PUBLIC)) {
 366                                                 if (name[2] == '_' && name[1] == 'p' && name[0] == 'o') {
 367                                                         var op_type = Operator.GetType (name);
 368                                                         if (op_type.HasValue && parameters.Count > 0 && parameters.Count < 3) {
 369                                                                 kind = MemberKind.Operator;
 370                                                         }
 371                                                 }
 372                                         } else if (parameters.IsEmpty && name == Destructor.MetadataName) {
 373                                                 kind = MemberKind.Destructor;
 374                                                 if (declaringType == TypeManager.object_type) {
 375                                                         mod &= ~Modifiers.OVERRIDE;
 376                                                         mod |= Modifiers.VIRTUAL;
 377                                                 }
 378                                         }
 379                                 }
 380
 381                                 var mi = (MethodInfo) mb;
 382                                 returnType = ImportType (mi.ReturnType, new DynamicTypeReader (mi.ReturnParameter));
 383
 384                                 // Cannot set to OVERRIDE without full hierarchy checks
 385                                 // this flag indicates that the method could be override
 386                                 // but further validation is needed
 387                                 if ((mod & Modifiers.OVERRIDE) != 0 && kind == MemberKind.Method && declaringType.BaseType != null) {
 388                                         var filter = MemberFilter.Method (name, tparams != null ? tparams.Length : 0, parameters, null);
 389                                         var candidate = MemberCache.FindMember (declaringType.BaseType, filter, BindingRestriction.None);
 390
 391                                         //
 392                                         // For imported class method do additional validation to be sure that metadata
 393                                         // override flag was correct
 394                                         //
 395                                         // Difference between protected internal and protected is ok
 396                                         //
 397                                         const Modifiers conflict_mask = Modifiers.AccessibilityMask & ~Modifiers.INTERNAL;
 398                                         if (candidate == null || (candidate.Modifiers & conflict_mask) != (mod & conflict_mask) || candidate.IsStatic) {
 399                                                 mod &= ~Modifiers.OVERRIDE;
 400                                         }
 401                                 }
 402                         }
 403
 404                         IMemberDefinition definition;
 405                         if (tparams != null) {
 406                                 definition = new ImportedGenericMethodDefinition ((MethodInfo) mb, returnType, parameters, tparams, this);
 407                         } else {
 408                                 definition = new ImportedParameterMemberDefinition (mb, returnType, parameters, this);
 409                         }
 410
 411                         MethodSpec ms = new MethodSpec (kind, declaringType, definition, returnType, mb, parameters, mod);
 412                         if (tparams != null)
 413                                 ms.IsGeneric = true;
 414
 415                         return ms;
 416                 }
 417
 418                 //
 419                 // Imports System.Reflection parameters
 420                 //
 421                 AParametersCollection CreateParameters (TypeSpec parent, ParameterInfo[] pi, MethodBase method)
 422                 {
 423                         int varargs = method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0 ? 1 : 0;
 424
 425                         if (pi.Length == 0 && varargs == 0)
 426                                 return ParametersCompiled.EmptyReadOnlyParameters;
 427
 428                         TypeSpec[] types = new TypeSpec[pi.Length + varargs];
 429                         IParameterData[] par = new IParameterData[pi.Length + varargs];
 430                         bool is_params = false;
 431                         for (int i = 0; i < pi.Length; i++) {
 432                                 ParameterInfo p = pi[i];
 433                                 Parameter.Modifier mod = 0;
 434                                 Expression default_value = null;
 435                                 if (p.ParameterType.IsByRef) {
 436                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 437                                                 mod = Parameter.Modifier.OUT;
 438                                         else
 439                                                 mod = Parameter.Modifier.REF;
 440
 441                                         //
 442                                         // Strip reference wrapping
 443                                         //
 444                                         var el = p.ParameterType.GetElementType ();
 445                                         types[i] = ImportType (el, new DynamicTypeReader (p));  // TODO: 1-based positio to be csc compatible
 446                                 } else if (i == 0 && method.IsStatic && parent.IsStatic && parent.MemberDefinition.DeclaringAssembly.HasExtensionMethod &&
 447                                         HasAttribute (CustomAttributeData.GetCustomAttributes (method), "ExtensionAttribute", CompilerServicesNamespace)) {
 448                                         mod = Parameter.Modifier.This;
 449                                         types[i] = ImportType (p.ParameterType);
 450                                 } else {
 451                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 452
 453                                         if (i >= pi.Length - 2 && types[i] is ArrayContainer) {
 454                                                 if (HasAttribute (CustomAttributeData.GetCustomAttributes (p), "ParamArrayAttribute", "System")) {
 455                                                         mod = Parameter.Modifier.PARAMS;
 456                                                         is_params = true;
 457                                                 }
 458                                         }
 459
 460                                         if (!is_params && p.IsOptional) {
 461                                                 object value = p.RawDefaultValue;
 462                                                 var ptype = types[i];
 463                                                 if ((p.Attributes & ParameterAttributes.HasDefault) != 0 && ptype.Kind != MemberKind.TypeParameter && (value != null || TypeManager.IsReferenceType (ptype))) {
 464                                                         if (value == null) {
 465                                                                 default_value = Constant.CreateConstant (null, ptype, null, Location.Null);
 466                                                         } else {
 467                                                                 default_value = ImportParameterConstant (value).Resolve (null);
 468
 469                                                                 if (ptype.IsEnum) {
 470                                                                         default_value = new EnumConstant ((Constant) default_value, ptype).Resolve (null);
 471                                                                 }
 472                                                         }
 473                                                 } else if (value == Missing.Value) {
 474                                                         default_value = EmptyExpression.MissingValue;
 475                                                 } else if (value == null) {
 476                                                         default_value = new DefaultValueExpression (new TypeExpression (ptype, Location.Null), Location.Null);
 477                                                 } else if (ptype == TypeManager.decimal_type) {
 478                                                         default_value = ImportParameterConstant (value).Resolve (null);
 479                                                 }
 480                                         }
 481                                 }
 482
 483                                 par[i] = new ParameterData (p.Name, mod, default_value);
 484                         }
 485
 486                         if (varargs != 0) {
 487                                 par[par.Length - 1] = new ArglistParameter (Location.Null);
 488                                 types[types.Length - 1] = InternalType.Arglist;
 489                         }
 490
 491                         return method != null ?
 492                                 new ParametersImported (par, types, varargs != 0, is_params) :
 493                                 new ParametersImported (par, types, is_params);
 494                 }
 495
 496                 //
 497                 // Returns null when the property is not valid C# property
 498                 //
 499                 public PropertySpec CreateProperty (PropertyInfo pi, TypeSpec declaringType, MethodSpec get, MethodSpec set)
 500                 {
 501                         Modifiers mod = 0;
 502                         AParametersCollection param = null;
 503                         TypeSpec type = null;
 504                         if (get != null) {
 505                                 mod = get.Modifiers;
 506                                 param = get.Parameters;
 507                                 type = get.ReturnType;
 508                         }
 509
 510                         bool is_valid_property = true;
 511                         if (set != null) {
 512                                 if (set.ReturnType != TypeManager.void_type)
 513                                         is_valid_property = false;
 514
 515                                 var set_param_count = set.Parameters.Count - 1;
 516
 517                                 if (set_param_count < 0) {
 518                                         set_param_count = 0;
 519                                         is_valid_property = false;
 520                                 }
 521
 522                                 var set_type = set.Parameters.Types[set_param_count];
 523
 524                                 if (mod == 0) {
 525                                         AParametersCollection set_based_param;
 526
 527                                         if (set_param_count == 0) {
 528                                                 set_based_param = ParametersCompiled.EmptyReadOnlyParameters;
 529                                         } else {
 530                                                 //
 531                                                 // Create indexer parameters based on setter method parameters (the last parameter has to be removed)
 532                                                 //
 533                                                 var data = new IParameterData[set_param_count];
 534                                                 var types = new TypeSpec[set_param_count];
 535                                                 Array.Copy (set.Parameters.FixedParameters, data, set_param_count);
 536                                                 Array.Copy (set.Parameters.Types, types, set_param_count);
 537                                                 set_based_param = new ParametersImported (data, types, set.Parameters.HasParams);
 538                                         }
 539
 540                                         mod = set.Modifiers;
 541                                         param = set_based_param;
 542                                         type = set_type;
 543                                 } else {
 544                                         if (set_param_count != get.Parameters.Count)
 545                                                 is_valid_property = false;
 546
 547                                         if (get.ReturnType != set_type)
 548                                                 is_valid_property = false;
 549
 550                                         // Possible custom accessor modifiers
 551                                         if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
 552                                                 var get_acc = mod & Modifiers.AccessibilityMask;
 553                                                 if (get_acc != Modifiers.PUBLIC) {
 554                                                         var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
 555                                                         // If the accessor modifiers are not same, do extra restriction checks
 556                                                         if (get_acc != set_acc) {
 557                                                                 var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
 558                                                                 var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
 559                                                                 if (get_restr && set_restr) {
 560                                                                         is_valid_property = false; // Neither is more restrictive
 561                                                                 }
 562
 563                                                                 if (get_restr) {
 564                                                                         mod &= ~Modifiers.AccessibilityMask;
 565                                                                         mod |= set_acc;
 566                                                                 }
 567                                                         }
 568                                                 }
 569                                         }
 570                                 }
 571                         }
 572
 573                         PropertySpec spec = null;
 574                         if (!param.IsEmpty) {
 575                                 var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
 576                                 if (index_name == null) {
 577                                         is_valid_property = false;
 578                                 } else {
 579                                         if (get != null) {
 580                                                 if (get.IsStatic)
 581                                                         is_valid_property = false;
 582                                                 if (get.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 583                                                         is_valid_property = false;
 584                                         }
 585                                         if (set != null) {
 586                                                 if (set.IsStatic)
 587                                                         is_valid_property = false;
 588                                                 if (set.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 589                                                         is_valid_property = false;
 590                                         }
 591                                 }
 592
 593                                 if (is_valid_property)
 594                                         spec = new IndexerSpec (declaringType, new ImportedParameterMemberDefinition (pi, type, param, this), type, param, pi, mod);
 595                         }
 596
 597                         if (spec == null)
 598                                 spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi, type, this), type, pi, mod);
 599
 600                         if (!is_valid_property) {
 601                                 spec.IsNotRealProperty = true;
 602                                 return spec;
 603                         }
 604
 605                         if (set != null)
 606                                 spec.Set = set;
 607                         if (get != null)
 608                                 spec.Get = get;
 609
 610                         return spec;
 611                 }
 612
 613                 public TypeSpec CreateType (MetaType type)
 614                 {
 615                         return CreateType (type, new DynamicTypeReader (), true);
 616                 }
 617
 618                 public TypeSpec CreateNestedType (MetaType type, TypeSpec declaringType)
 619                 {
 620                         return CreateType (type, declaringType, new DynamicTypeReader (type), false);
 621                 }
 622
 623                 TypeSpec CreateType (MetaType type, DynamicTypeReader dtype, bool canImportBaseType)
 624                 {
 625                         TypeSpec declaring_type;
 626                         if (type.IsNested && !type.IsGenericParameter)
 627                                 declaring_type = CreateType (type.DeclaringType, new DynamicTypeReader (type.DeclaringType), true);
 628                         else
 629                                 declaring_type = null;
 630
 631                         return CreateType (type, declaring_type, dtype, canImportBaseType);
 632                 }
 633
 634                 TypeSpec CreateType (MetaType type, TypeSpec declaringType, DynamicTypeReader dtype, bool canImportBaseType)
 635                 {
 636                         TypeSpec spec;
 637                         if (import_cache.TryGetValue (type, out spec)) {
 638                                 if (spec == TypeManager.object_type) {
 639                                         if (dtype.IsDynamicObject (this))
 640                                                 return InternalType.Dynamic;
 641
 642                                         return spec;
 643                                 }
 644
 645                                 if (!spec.IsGeneric || type.IsGenericTypeDefinition)
 646                                         return spec;
 647
 648                                 if (!dtype.HasDynamicAttribute (this))
 649                                         return spec;
 650
 651                                 // We've found same object in the cache but this one has a dynamic custom attribute
 652                                 // and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
 653                                 // Do type resolve process again in that case
 654
 655                                 // TODO: Handle cases where they still unify
 656                         }
 657
 658                         if (IsMissingType (type)) {
 659                                 spec = new TypeSpec (MemberKind.MissingType, declaringType, new ImportedTypeDefinition (type, this), type, Modifiers.PUBLIC);
 660                                 spec.MemberCache = MemberCache.Empty;
 661                                 import_cache.Add (type, spec);
 662                                 return spec;
 663                         }
 664
 665                         if (type.IsGenericType && !type.IsGenericTypeDefinition) {
 666                                 var type_def = type.GetGenericTypeDefinition ();
 667                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 668                                 if (declaringType == null) {
 669                                         // Simple case, no nesting
 670                                         spec = CreateType (type_def, null, new DynamicTypeReader (), canImportBaseType);
 671                                         spec = spec.MakeGenericType (targs);
 672                                 } else {
 673                                         //
 674                                         // Nested type case, converting .NET types like
 675                                         // A`1.B`1.C`1<int, long, string> to typespec like
 676                                         // A<int>.B<long>.C<string>
 677                                         //
 678                                         var nested_hierarchy = new List<TypeSpec> ();
 679                                         while (declaringType.IsNested) {
 680                                                 nested_hierarchy.Add (declaringType);
 681                                                 declaringType = declaringType.DeclaringType;
 682                                         }
 683
 684                                         int targs_pos = 0;
 685                                         if (declaringType.Arity > 0) {
 686                                                 spec = declaringType.MakeGenericType (targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
 687                                                 targs_pos = spec.Arity;
 688                                         } else {
 689                                                 spec = declaringType;
 690                                         }
 691
 692                                         for (int i = nested_hierarchy.Count; i != 0; --i) {
 693                                                 var t = nested_hierarchy [i - 1];
 694                                                 spec = MemberCache.FindNestedType (spec, t.Name, t.Arity);
 695                                                 if (t.Arity > 0) {
 696                                                         spec = spec.MakeGenericType (targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
 697                                                         targs_pos += t.Arity;
 698                                                 }
 699                                         }
 700
 701                                         string name = type.Name;
 702                                         int index = name.IndexOf ('`');
 703                                         if (index > 0)
 704                                                 name = name.Substring (0, index);
 705
 706                                         spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos);
 707                                         if (spec.Arity > 0) {
 708                                                 spec = spec.MakeGenericType (targs.Skip (targs_pos).ToArray ());
 709                                         }
 710                                 }
 711
 712                                 // Don't add generic type with dynamic arguments, they can interfere with same type
 713                                 // using object type arguments
 714                                 if (!spec.HasDynamicElement) {
 715
 716                                         // Add to reading cache to speed up reading
 717                                         if (!import_cache.ContainsKey (type))
 718                                                 import_cache.Add (type, spec);
 719                                 }
 720
 721                                 return spec;
 722                         }
 723
 724                         Modifiers mod;
 725                         MemberKind kind;
 726
 727                         var ma = type.Attributes;
 728                         switch (ma & TypeAttributes.VisibilityMask) {
 729                         case TypeAttributes.Public:
 730                         case TypeAttributes.NestedPublic:
 731                                 mod = Modifiers.PUBLIC;
 732                                 break;
 733                         case TypeAttributes.NestedPrivate:
 734                                 mod = Modifiers.PRIVATE;
 735                                 break;
 736                         case TypeAttributes.NestedFamily:
 737                                 mod = Modifiers.PROTECTED;
 738                                 break;
 739                         case TypeAttributes.NestedFamORAssem:
 740                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 741                                 break;
 742                         default:
 743                                 mod = Modifiers.INTERNAL;
 744                                 break;
 745                         }
 746
 747                         if ((ma & TypeAttributes.Interface) != 0) {
 748                                 kind = MemberKind.Interface;
 749                         } else if (type.IsGenericParameter) {
 750                                 kind = MemberKind.TypeParameter;
 751                         } else {
 752                                 var base_type = type.BaseType;
 753                                 if (base_type == null || (ma & TypeAttributes.Abstract) != 0) {
 754                                         kind = MemberKind.Class;
 755                                 } else {
 756                                         kind = DetermineKindFromBaseType (base_type);
 757                                         if (kind == MemberKind.Struct || kind == MemberKind.Delegate) {
 758                                                 mod |= Modifiers.SEALED;
 759                                         }
 760                                 }
 761
 762                                 if (kind == MemberKind.Class) {
 763                                         if ((ma & TypeAttributes.Sealed) != 0) {
 764                                                 mod |= Modifiers.SEALED;
 765                                                 if ((ma & TypeAttributes.Abstract) != 0)
 766                                                         mod |= Modifiers.STATIC;
 767                                         } else if ((ma & TypeAttributes.Abstract) != 0) {
 768                                                 mod |= Modifiers.ABSTRACT;
 769                                         }
 770                                 }
 771                         }
 772
 773                         var definition = new ImportedTypeDefinition (type, this);
 774                         TypeSpec pt;
 775
 776                         if (kind == MemberKind.Enum) {
 777                                 const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
 778                                         BindingFlags.Instance |
 779                                         BindingFlags.Public | BindingFlags.NonPublic;
 780
 781                                 var type_members = type.GetFields (underlying_member);
 782                                 foreach (var type_member in type_members) {
 783                                         spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
 784                                         break;
 785                                 }
 786
 787                                 if (spec == null)
 788                                         kind = MemberKind.Class;
 789
 790                         } else if (kind == MemberKind.TypeParameter) {
 791                                 // Return as type_cache was updated
 792                                 return CreateTypeParameter (type, declaringType);
 793                         } else if (type.IsGenericTypeDefinition) {
 794                                 definition.TypeParameters = CreateGenericParameters (type, declaringType);
 795
 796                                 // Constraints are not loaded on demand and can reference this type
 797                                 if (import_cache.TryGetValue (type, out spec))
 798                                         return spec;
 799
 800                         } else if (compiled_types.TryGetValue (type, out pt)) {
 801                                 //
 802                                 // Same type was found in inside compiled types. It's
 803                                 // either build-in type or forward referenced typed
 804                                 // which point into just compiled assembly.
 805                                 //
 806                                 spec = pt;
 807                                 BuildinTypeSpec bts = pt as BuildinTypeSpec;
 808                                 if (bts != null)
 809                                         bts.SetDefinition (definition, type, mod);
 810                         }
 811
 812                         if (spec == null)
 813                                 spec = new TypeSpec (kind, declaringType, definition, type, mod);
 814
 815                         import_cache.Add (type, spec);
 816
 817                         //
 818                         // Two stage setup as the base type can be inflated declaring type or
 819                         // another nested type inside same declaring type which has not been
 820                         // loaded, therefore we can import a base type of nested types once
 821                         // the types have been imported
 822                         //
 823                         if (canImportBaseType)
 824                                 ImportTypeBase (spec, type);
 825
 826                         return spec;
 827                 }
 828
 829                 public IAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
 830                 {
 831                         IAssemblyDefinition found;
 832                         if (!assembly_2_definition.TryGetValue (assembly, out found)) {
 833
 834                                 // This can happen in dynamic context only
 835                                 var def = new ImportedAssemblyDefinition (assembly, this);
 836                                 assembly_2_definition.Add (assembly, def);
 837                                 def.ReadAttributes ();
 838                                 found = def;
 839                         }
 840
 841                         return found;
 842                 }
 843
 844                 public void ImportTypeBase (MetaType type)
 845                 {
 846                         TypeSpec spec = import_cache[type];
 847                         if (spec != null)
 848                                 ImportTypeBase (spec, type);
 849                 }
 850
 851                 TypeParameterSpec CreateTypeParameter (MetaType type, TypeSpec declaringType)
 852                 {
 853                         Variance variance;
 854                         switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
 855                         case GenericParameterAttributes.Covariant:
 856                                 variance = Variance.Covariant;
 857                                 break;
 858                         case GenericParameterAttributes.Contravariant:
 859                                 variance = Variance.Contravariant;
 860                                 break;
 861                         default:
 862                                 variance = Variance.None;
 863                                 break;
 864                         }
 865
 866                         SpecialConstraint special = SpecialConstraint.None;
 867                         var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
 868
 869                         if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
 870                                 special |= SpecialConstraint.Struct;
 871                         } else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
 872                                 special = SpecialConstraint.Constructor;
 873                         }
 874
 875                         if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
 876                                 special |= SpecialConstraint.Class;
 877                         }
 878
 879                         TypeParameterSpec spec;
 880                         var def = new ImportedTypeParameterDefinition (type, this);
 881                         if (type.DeclaringMethod != null)
 882                                 spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
 883                         else
 884                                 spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
 885
 886                         // Add it now, so any constraint can reference it and get same instance
 887                         import_cache.Add (type, spec);
 888
 889                         var constraints = type.GetGenericParameterConstraints ();
 890                         List<TypeSpec> tparams = null;
 891                         foreach (var ct in constraints) {
 892                                 if (ct.IsGenericParameter) {
 893                                         if (tparams == null)
 894                                                 tparams = new List<TypeSpec> ();
 895
 896                                         tparams.Add (CreateType (ct));
 897                                         continue;
 898                                 }
 899
 900                                 if (!IsMissingType (ct) && ct.IsClass) {
 901                                         spec.BaseType = CreateType (ct);
 902                                         continue;
 903                                 }
 904
 905                                 spec.AddInterface (CreateType (ct));
 906                         }
 907
 908                         if (spec.BaseType == null)
 909                                 spec.BaseType = TypeManager.object_type;
 910
 911                         if (tparams != null)
 912                                 spec.TypeArguments = tparams.ToArray ();
 913
 914                         return spec;
 915                 }
 916
 917                 //
 918                 // Test for a custom attribute type match. Custom attributes are not really predefined globaly
 919                 // they can be assembly specific therefore we do check based on names only
 920                 //
 921                 public bool HasAttribute (IList<CustomAttributeData> attributesData, string attrName, string attrNamespace)
 922                 {
 923                         if (attributesData.Count == 0)
 924                                 return false;
 925
 926                         string ns, name;
 927                         foreach (var attr in attributesData) {
 928                                 GetCustomAttributeTypeName (attr, out ns, out name);
 929                                 if (name == attrName && ns == attrNamespace)
 930                                         return true;
 931                         }
 932
 933                         return false;
 934                 }
 935
 936                 void ImportTypeBase (TypeSpec spec, MetaType type)
 937                 {
 938                         if (spec.Kind == MemberKind.Interface)
 939                                 spec.BaseType = TypeManager.object_type;
 940                         else if (type.BaseType != null) {
 941                                 TypeSpec base_type;
 942                                 if (!IsMissingType (type.BaseType) && type.BaseType.IsGenericType)
 943                                         base_type = CreateType (type.BaseType, new DynamicTypeReader (type), true);
 944                                 else
 945                                         base_type = CreateType (type.BaseType);
 946
 947                                 spec.BaseType = base_type;
 948                         }
 949
 950                         MetaType[] ifaces;
 951 #if STATIC
 952                         ifaces = type.__GetDeclaredInterfaces ();
 953                         if (ifaces.Length != 0) {
 954                                 foreach (var iface in ifaces)
 955                                         spec.AddInterface (CreateType (iface));
 956                         }
 957
 958                         if (spec.BaseType != null) {
 959                                 var bifaces = spec.BaseType.Interfaces;
 960                                 if (bifaces != null) {
 961                                         foreach (var iface in bifaces)
 962                                                 spec.AddInterface (iface);
 963                                 }
 964                         }
 965 #else
 966                         ifaces = type.GetInterfaces ();
 967
 968                         if (ifaces.Length > 0) {
 969                                 foreach (var iface in ifaces) {
 970                                         spec.AddInterface (CreateType (iface));
 971                                 }
 972                         }
 973 #endif
 974                 }
 975
 976                 protected void ImportTypes (MetaType[] types, Namespace targetNamespace, bool hasExtensionTypes)
 977                 {
 978                         Namespace ns = targetNamespace;
 979                         string prev_namespace = null;
 980                         foreach (var t in types) {
 981                                 if (t == null)
 982                                         continue;
 983
 984                                 // Be careful not to trigger full parent type loading
 985                                 if (t.MemberType == MemberTypes.NestedType)
 986                                         continue;
 987
 988                                 if (t.Name[0] == '<')
 989                                         continue;
 990
 991                                 var it = CreateType (t, null, new DynamicTypeReader (t), true);
 992                                 if (it == null)
 993                                         continue;
 994
 995                                 if (prev_namespace != t.Namespace) {
 996                                         ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
 997                                         prev_namespace = t.Namespace;
 998                                 }
 999
1000                                 ns.AddType (it);
1001
1002                                 if (it.IsStatic && hasExtensionTypes &&
1003                                         HasAttribute (CustomAttributeData.GetCustomAttributes (t), "ExtensionAttribute", CompilerServicesNamespace)) {
1004                                         it.SetExtensionMethodContainer ();
1005                                 }
1006                         }
1007                 }
1008
1009                 static Constant ImportParameterConstant (object value)
1010                 {
1011                         //
1012                         // Get type of underlying value as int constant can be used for object
1013                         // parameter type. This is not allowed in C# but other languages can do that
1014                         //
1015                         switch (System.Type.GetTypeCode (value.GetType ())) {
1016                         case TypeCode.Boolean:
1017                                 return new BoolConstant ((bool) value, Location.Null);
1018                         case TypeCode.Byte:
1019                                 return new ByteConstant ((byte) value, Location.Null);
1020                         case TypeCode.Char:
1021                                 return new CharConstant ((char) value, Location.Null);
1022                         case TypeCode.Decimal:
1023                                 return new DecimalConstant ((decimal) value, Location.Null);
1024                         case TypeCode.Double:
1025                                 return new DoubleConstant ((double) value, Location.Null);
1026                         case TypeCode.Int16:
1027                                 return new ShortConstant ((short) value, Location.Null);
1028                         case TypeCode.Int32:
1029                                 return new IntConstant ((int) value, Location.Null);
1030                         case TypeCode.Int64:
1031                                 return new LongConstant ((long) value, Location.Null);
1032                         case TypeCode.SByte:
1033                                 return new SByteConstant ((sbyte) value, Location.Null);
1034                         case TypeCode.Single:
1035                                 return new FloatConstant ((float) value, Location.Null);
1036                         case TypeCode.String:
1037                                 return new StringConstant ((string) value, Location.Null);
1038                         case TypeCode.UInt16:
1039                                 return new UShortConstant ((ushort) value, Location.Null);
1040                         case TypeCode.UInt32:
1041                                 return new UIntConstant ((uint) value, Location.Null);
1042                         case TypeCode.UInt64:
1043                                 return new ULongConstant ((ulong) value, Location.Null);
1044                         }
1045
1046                         throw new NotImplementedException (value.GetType ().ToString ());
1047                 }
1048
1049                 public TypeSpec ImportType (MetaType type)
1050                 {
1051                         return ImportType (type, new DynamicTypeReader (type));
1052                 }
1053
1054                 TypeSpec ImportType (MetaType type, DynamicTypeReader dtype)
1055                 {
1056                         if (type.HasElementType) {
1057                                 var element = type.GetElementType ();
1058                                 ++dtype.Position;
1059                                 var spec = ImportType (element, dtype);
1060
1061                                 if (type.IsArray)
1062                                         return ArrayContainer.MakeType (spec, type.GetArrayRank ());
1063                                 if (type.IsByRef)
1064                                         return ReferenceContainer.MakeType (spec);
1065                                 if (type.IsPointer)
1066                                         return PointerContainer.MakeType (spec);
1067
1068                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
1069                         }
1070
1071                         return CreateType (type, dtype, true);
1072                 }
1073
1074                 static bool IsMissingType (MetaType type)
1075                 {
1076 #if STATIC
1077                         return type.__IsMissing;
1078 #else
1079                         return false;
1080 #endif
1081                 }
1082
1083                 //
1084                 // Decimal constants cannot be encoded in the constant blob, and thus are marked
1085                 // as IsInitOnly ('readonly' in C# parlance).  We get its value from the
1086                 // DecimalConstantAttribute metadata.
1087                 //
1088                 Constant ReadDecimalConstant (IList<CustomAttributeData> attrs)
1089                 {
1090                         if (attrs.Count == 0)
1091                                 return null;
1092
1093                         string name, ns;
1094                         foreach (var ca in attrs) {
1095                                 GetCustomAttributeTypeName (ca, out ns, out name);
1096                                 if (name != "DecimalConstantAttribute" || ns != CompilerServicesNamespace)
1097                                         continue;
1098
1099                                 var value = new decimal (
1100                                         (int) (uint) ca.ConstructorArguments[4].Value,
1101                                         (int) (uint) ca.ConstructorArguments[3].Value,
1102                                         (int) (uint) ca.ConstructorArguments[2].Value,
1103                                         (byte) ca.ConstructorArguments[1].Value != 0,
1104                                         (byte) ca.ConstructorArguments[0].Value);
1105
1106                                 return new DecimalConstant (value, Location.Null).Resolve (null);
1107                         }
1108
1109                         return null;
1110                 }
1111
1112                 static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
1113                 {
1114                         Modifiers mod;
1115                         var ma = mb.Attributes;
1116                         switch (ma & MethodAttributes.MemberAccessMask) {
1117                         case MethodAttributes.Public:
1118                                 mod = Modifiers.PUBLIC;
1119                                 break;
1120                         case MethodAttributes.Assembly:
1121                                 mod = Modifiers.INTERNAL;
1122                                 break;
1123                         case MethodAttributes.Family:
1124                                 mod = Modifiers.PROTECTED;
1125                                 break;
1126                         case MethodAttributes.FamORAssem:
1127                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
1128                                 break;
1129                         default:
1130                                 mod = Modifiers.PRIVATE;
1131                                 break;
1132                         }
1133
1134                         if ((ma & MethodAttributes.Static) != 0) {
1135                                 mod |= Modifiers.STATIC;
1136                                 return mod;
1137                         }
1138                         if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
1139                                 mod |= Modifiers.ABSTRACT;
1140                                 return mod;
1141                         }
1142
1143                         if ((ma & MethodAttributes.Final) != 0)
1144                                 mod |= Modifiers.SEALED;
1145
1146                         // It can be sealed and override
1147                         if ((ma & MethodAttributes.Virtual) != 0) {
1148                                 if ((ma & MethodAttributes.NewSlot) != 0 || !declaringType.IsClass) {
1149                                         // No private virtual or sealed virtual
1150                                         if ((mod & (Modifiers.PRIVATE | Modifiers.SEALED)) == 0)
1151                                                 mod |= Modifiers.VIRTUAL;
1152                                 } else {
1153                                         mod |= Modifiers.OVERRIDE;
1154                                 }
1155                         }
1156
1157                         return mod;
1158                 }
1159         }
1160
1161         abstract class ImportedDefinition : IMemberDefinition
1162         {
1163                 protected class AttributesBag
1164                 {
1165                         public static readonly AttributesBag Default = new AttributesBag ();
1166
1167                         public AttributeUsageAttribute AttributeUsage;
1168                         public ObsoleteAttribute Obsolete;
1169                         public string[] Conditionals;
1170                         public string DefaultIndexerName;
1171                         public bool IsNotCLSCompliant;
1172                         public TypeSpec CoClass;
1173
1174                         public static AttributesBag Read (MemberInfo mi, MetadataImporter importer)
1175                         {
1176                                 AttributesBag bag = null;
1177                                 List<string> conditionals = null;
1178
1179                                 // It should not throw any loading exception
1180                                 IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
1181
1182                                 string ns, name;
1183                                 foreach (var a in attrs) {
1184                                         importer.GetCustomAttributeTypeName (a, out ns, out name);
1185                                         if (name == "ObsoleteAttribute") {
1186                                                 if (ns != "System")
1187                                                         continue;
1188
1189                                                 if (bag == null)
1190                                                         bag = new AttributesBag ();
1191
1192                                                 var args = a.ConstructorArguments;
1193
1194                                                 if (args.Count == 1) {
1195                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
1196                                                 } else if (args.Count == 2) {
1197                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
1198                                                 } else {
1199                                                         bag.Obsolete = new ObsoleteAttribute ();
1200                                                 }
1201
1202                                                 continue;
1203                                         }
1204
1205                                         if (name == "ConditionalAttribute") {
1206                                                 if (ns != "System.Diagnostics")
1207                                                         continue;
1208
1209                                                 if (bag == null)
1210                                                         bag = new AttributesBag ();
1211
1212                                                 if (conditionals == null)
1213                                                         conditionals = new List<string> (2);
1214
1215                                                 conditionals.Add ((string) a.ConstructorArguments[0].Value);
1216                                                 continue;
1217                                         }
1218
1219                                         if (name == "CLSCompliantAttribute") {
1220                                                 if (ns != "System")
1221                                                         continue;
1222
1223                                                 if (bag == null)
1224                                                         bag = new AttributesBag ();
1225
1226                                                 bag.IsNotCLSCompliant = !(bool) a.ConstructorArguments[0].Value;
1227                                                 continue;
1228                                         }
1229
1230                                         // Type only attributes
1231                                         if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
1232                                                 if (name == "DefaultMemberAttribute") {
1233                                                         if (ns != "System.Reflection")
1234                                                                 continue;
1235
1236                                                         if (bag == null)
1237                                                                 bag = new AttributesBag ();
1238
1239                                                         bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
1240                                                         continue;
1241                                                 }
1242
1243                                                 if (name == "AttributeUsageAttribute") {
1244                                                         if (ns != "System")
1245                                                                 continue;
1246
1247                                                         if (bag == null)
1248                                                                 bag = new AttributesBag ();
1249
1250                                                         bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
1251                                                         foreach (var named in a.NamedArguments) {
1252                                                                 if (named.MemberInfo.Name == "AllowMultiple")
1253                                                                         bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
1254                                                                 else if (named.MemberInfo.Name == "Inherited")
1255                                                                         bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
1256                                                         }
1257                                                         continue;
1258                                                 }
1259
1260                                                 // Interface only attribute
1261                                                 if (name == "CoClassAttribute") {
1262                                                         if (ns != "System.Runtime.InteropServices")
1263                                                                 continue;
1264
1265                                                         if (bag == null)
1266                                                                 bag = new AttributesBag ();
1267
1268                                                         bag.CoClass = importer.ImportType ((MetaType) a.ConstructorArguments[0].Value);
1269                                                         continue;
1270                                                 }
1271                                         }
1272                                 }
1273
1274                                 if (bag == null)
1275                                         return Default;
1276
1277                                 if (conditionals != null)
1278                                         bag.Conditionals = conditionals.ToArray ();
1279
1280                                 return bag;
1281                         }
1282                 }
1283
1284                 protected readonly MemberInfo provider;
1285                 protected AttributesBag cattrs;
1286                 protected readonly MetadataImporter importer;
1287
1288                 public ImportedDefinition (MemberInfo provider, MetadataImporter importer)
1289                 {
1290                         this.provider = provider;
1291                         this.importer = importer;
1292                 }
1293
1294                 #region Properties
1295
1296                 public bool IsImported {
1297                         get {
1298                                 return true;
1299                         }
1300                 }
1301
1302                 public virtual string Name {
1303                         get {
1304                                 return provider.Name;
1305                         }
1306                 }
1307
1308                 #endregion
1309
1310                 public string[] ConditionalConditions ()
1311                 {
1312                         if (cattrs == null)
1313                                 ReadAttributes ();
1314
1315                         return cattrs.Conditionals;
1316                 }
1317
1318                 public ObsoleteAttribute GetAttributeObsolete ()
1319                 {
1320                         if (cattrs == null)
1321                                 ReadAttributes ();
1322
1323                         return cattrs.Obsolete;
1324                 }
1325
1326                 public bool IsNotCLSCompliant ()
1327                 {
1328                         if (cattrs == null)
1329                                 ReadAttributes ();
1330
1331                         return cattrs.IsNotCLSCompliant;
1332                 }
1333
1334                 protected void ReadAttributes ()
1335                 {
1336                         cattrs = AttributesBag.Read (provider, importer);
1337                 }
1338
1339                 public void SetIsAssigned ()
1340                 {
1341                         // Unused for imported members
1342                 }
1343
1344                 public void SetIsUsed ()
1345                 {
1346                         // Unused for imported members
1347                 }
1348         }
1349
1350         public class ImportedModuleDefinition
1351         {
1352                 readonly Module module;
1353                 bool cls_compliant;
1354                 readonly MetadataImporter importer;
1355
1356                 public ImportedModuleDefinition (Module module, MetadataImporter importer)
1357                 {
1358                         this.module = module;
1359                         this.importer = importer;
1360                 }
1361
1362                 #region Properties
1363
1364                 public bool IsCLSCompliant {
1365                         get {
1366                                 return cls_compliant;
1367                         }
1368                 }
1369
1370                 public string Name {
1371                         get {
1372                                 return module.Name;
1373                         }
1374                 }
1375
1376                 #endregion
1377
1378                 public void ReadAttributes ()
1379                 {
1380                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
1381
1382                         string ns, name;
1383                         foreach (var a in attrs) {
1384                                 importer.GetCustomAttributeTypeName (a, out ns, out name);
1385                                 if (name == "CLSCompliantAttribute") {
1386                                         if (ns != "System")
1387                                                 continue;
1388
1389                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1390                                         continue;
1391                                 }
1392                         }
1393                 }
1394
1395                 //
1396                 // Reads assembly attributes which where attached to a special type because
1397                 // module does have assembly manifest
1398                 //
1399                 public List<Attribute> ReadAssemblyAttributes ()
1400                 {
1401                         var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
1402                         if (t == null)
1403                                 return null;
1404
1405                         var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
1406                         if (field == null)
1407                                 return null;
1408
1409                         // TODO: implement, the idea is to fabricate specil Attribute class and
1410                         // add it to OptAttributes before resolving the source code attributes
1411                         // Need to build module location as well for correct error reporting
1412
1413                         //var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
1414                         //var attrs = new List<Attribute> (assembly_attributes.Count);
1415                         //foreach (var a in assembly_attributes)
1416                         //{
1417                         //    var type = metaImporter.ImportType (a.Constructor.DeclaringType);
1418                         //    var ctor = metaImporter.CreateMethod (a.Constructor, type);
1419
1420                         //    foreach (var carg in a.ConstructorArguments) {
1421                         //        carg.Value
1422                         //    }
1423
1424                         //    attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
1425                         //}
1426
1427                         return null;
1428                 }
1429         }
1430
1431         public class ImportedAssemblyDefinition : IAssemblyDefinition
1432         {
1433                 readonly Assembly assembly;
1434                 readonly AssemblyName aname;
1435                 readonly MetadataImporter importer;
1436                 bool cls_compliant;
1437                 bool contains_extension_methods;
1438
1439                 List<AssemblyName> internals_visible_to;
1440                 Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
1441
1442                 public ImportedAssemblyDefinition (Assembly assembly, MetadataImporter importer)
1443                 {
1444                         this.assembly = assembly;
1445                         this.aname = assembly.GetName ();
1446                         this.importer = importer;
1447                 }
1448
1449                 #region Properties
1450
1451                 public Assembly Assembly {
1452                         get {
1453                                 return assembly;
1454                         }
1455                 }
1456
1457                 public string FullName {
1458                         get {
1459                                 return aname.FullName;
1460                         }
1461                 }
1462
1463                 public bool HasExtensionMethod {
1464                         get {
1465                                 return contains_extension_methods;
1466                         }
1467                 }
1468
1469                 public bool HasStrongName {
1470                         get {
1471                                 return aname.GetPublicKey ().Length != 0;
1472                         }
1473                 }
1474
1475                 public bool IsMissing {
1476                         get {
1477 #if STATIC
1478                                 return assembly.__IsMissing;
1479 #else
1480                                 return false;
1481 #endif
1482                         }
1483                 }
1484
1485                 public bool IsCLSCompliant {
1486                         get {
1487                                 return cls_compliant;
1488                         }
1489                 }
1490
1491                 public string Location {
1492                         get {
1493                                 return assembly.Location;
1494                         }
1495                 }
1496
1497                 public string Name {
1498                         get {
1499                                 return aname.Name;
1500                         }
1501                 }
1502
1503                 #endregion
1504
1505                 public byte[] GetPublicKeyToken ()
1506                 {
1507                         return aname.GetPublicKeyToken ();
1508                 }
1509
1510                 public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
1511                 {
1512                         return internals_visible_to_cache [assembly];
1513                 }
1514
1515                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1516                 {
1517                         if (internals_visible_to == null)
1518                                 return false;
1519
1520                         AssemblyName is_visible = null;
1521                         if (internals_visible_to_cache == null) {
1522                                 internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
1523                         } else {
1524                                 if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
1525                                         return is_visible != null;
1526                         }
1527
1528                         var token = assembly.GetPublicKeyToken ();
1529                         if (token != null && token.Length == 0)
1530                                 token = null;
1531
1532                         foreach (var internals in internals_visible_to) {
1533                                 if (internals.Name != assembly.Name)
1534                                         continue;
1535
1536                                 if (token == null && assembly is AssemblyDefinition) {
1537                                         is_visible = internals;
1538                                         break;
1539                                 }
1540
1541                                 if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
1542                                         continue;
1543
1544                                 is_visible = internals;
1545                                 break;
1546                         }
1547
1548                         internals_visible_to_cache.Add (assembly, is_visible);
1549                         return is_visible != null;
1550                 }
1551
1552                 public void ReadAttributes ()
1553                 {
1554 #if STATIC
1555                         if (assembly.__IsMissing)
1556                                 return;
1557 #endif
1558
1559                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
1560
1561                         string ns, name;
1562                         foreach (var a in attrs) {
1563                                 importer.GetCustomAttributeTypeName (a, out ns, out name);
1564
1565                                 if (name == "CLSCompliantAttribute") {
1566                                         if (ns == "System") {
1567                                                 try {
1568                                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1569                                                 } catch {
1570                                                 }
1571                                         }
1572                                         continue;
1573                                 }
1574
1575                                 if (name == "InternalsVisibleToAttribute") {
1576                                         if (ns != MetadataImporter.CompilerServicesNamespace)
1577                                                 continue;
1578
1579                                         string s;
1580                                         try {
1581                                                 s = a.ConstructorArguments[0].Value as string;
1582                                         } catch {
1583                                                 s = null;
1584                                         }
1585
1586                                         if (s == null)
1587                                                 continue;
1588
1589                                         var an = new AssemblyName (s);
1590                                         if (internals_visible_to == null)
1591                                                 internals_visible_to = new List<AssemblyName> ();
1592
1593                                         internals_visible_to.Add (an);
1594                                         continue;
1595                                 }
1596
1597                                 if (name == "ExtensionAttribute") {
1598                                         if (ns == MetadataImporter.CompilerServicesNamespace)
1599                                                 contains_extension_methods = true;
1600
1601                                         continue;
1602                                 }
1603                         }
1604                 }
1605
1606                 public override string ToString ()
1607                 {
1608                         return FullName;
1609                 }
1610         }
1611
1612         class ImportedMemberDefinition : ImportedDefinition
1613         {
1614                 readonly TypeSpec type;
1615
1616                 public ImportedMemberDefinition (MemberInfo member, TypeSpec type, MetadataImporter importer)
1617                         : base (member, importer)
1618                 {
1619                         this.type = type;
1620                 }
1621
1622                 #region Properties
1623
1624                 public TypeSpec MemberType {
1625                         get {
1626                                 return type;
1627                         }
1628                 }
1629
1630                 #endregion
1631         }
1632
1633         class ImportedParameterMemberDefinition : ImportedMemberDefinition, IParametersMember
1634         {
1635                 readonly AParametersCollection parameters;
1636
1637                 public ImportedParameterMemberDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1638                         : base (provider, type, importer)
1639                 {
1640                         this.parameters = parameters;
1641                 }
1642
1643                 public ImportedParameterMemberDefinition (PropertyInfo provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1644                         : base (provider, type, importer)
1645                 {
1646                         this.parameters = parameters;
1647                 }
1648
1649                 #region Properties
1650
1651                 public AParametersCollection Parameters {
1652                         get {
1653                                 return parameters;
1654                         }
1655                 }
1656
1657                 #endregion
1658         }
1659
1660         class ImportedGenericMethodDefinition : ImportedParameterMemberDefinition, IGenericMethodDefinition
1661         {
1662                 readonly TypeParameterSpec[] tparams;
1663
1664                 public ImportedGenericMethodDefinition (MethodInfo provider, TypeSpec type, AParametersCollection parameters, TypeParameterSpec[] tparams, MetadataImporter importer)
1665                         : base (provider, type, parameters, importer)
1666                 {
1667                         this.tparams = tparams;
1668                 }
1669
1670                 #region Properties
1671
1672                 public TypeParameterSpec[] TypeParameters {
1673                         get {
1674                                 return tparams;
1675                         }
1676                 }
1677
1678                 public int TypeParametersCount {
1679                         get {
1680                                 return tparams.Length;
1681                         }
1682                 }
1683
1684                 #endregion
1685         }
1686
1687         class ImportedTypeDefinition : ImportedDefinition, ITypeDefinition
1688         {
1689                 TypeParameterSpec[] tparams;
1690                 string name;
1691
1692                 public ImportedTypeDefinition (MetaType type, MetadataImporter importer)
1693                         : base (type, importer)
1694                 {
1695                 }
1696
1697                 #region Properties
1698
1699                 public IAssemblyDefinition DeclaringAssembly {
1700                         get {
1701                                 return importer.GetAssemblyDefinition (provider.Module.Assembly);
1702                         }
1703                 }
1704
1705                 public override string Name {
1706                         get {
1707                                 if (name == null) {
1708                                         name = base.Name;
1709                                         if (tparams != null) {
1710                                                 int arity_start = name.IndexOf ('`');
1711                                                 if (arity_start > 0)
1712                                                         name = name.Substring (0, arity_start);
1713                                         }
1714                                 }
1715
1716                                 return name;
1717                         }
1718                 }
1719
1720                 public string Namespace {
1721                         get {
1722                                 return ((MetaType) provider).Namespace;
1723                         }
1724                 }
1725
1726                 public int TypeParametersCount {
1727                         get {
1728                                 return tparams == null ? 0 : tparams.Length;
1729                         }
1730                 }
1731
1732                 public TypeParameterSpec[] TypeParameters {
1733                         get {
1734                                 return tparams;
1735                         }
1736                         set {
1737                                 tparams = value;
1738                         }
1739                 }
1740
1741                 #endregion
1742
1743                 public static void Error_MissingDependency (IMemberContext ctx, List<TypeSpec> types, Location loc)
1744                 {
1745                         //
1746                         // Report details about missing type and most likely cause of the problem.
1747                         // csc reports 1683, 1684 as warnings but we report them only when used
1748                         // or referenced from the user core in which case compilation error has to
1749                         // be reported because compiler cannot continue anyway
1750                         //
1751                         foreach (var t in types) {
1752                                 string name = t.GetSignatureForError ();
1753
1754                                 if (t.MemberDefinition.DeclaringAssembly == ctx.Module.DeclaringAssembly) {
1755                                         ctx.Compiler.Report.Error (1683, loc,
1756                                                 "Reference to type `{0}' claims it is defined in this assembly, but it is not defined in source or any added modules",
1757                                                 name);
1758                                 } else if (t.MemberDefinition.DeclaringAssembly.IsMissing) {
1759                                         ctx.Compiler.Report.Error (12, loc,
1760                                                 "The type `{0}' is defined in an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
1761                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
1762                                 } else {
1763                                         ctx.Compiler.Report.Error (1684, loc,
1764                                                 "Reference to type `{0}' claims it is defined assembly `{1}', but it could not be found",
1765                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
1766                                 }
1767                         }
1768                 }
1769
1770                 public TypeSpec GetAttributeCoClass ()
1771                 {
1772                         if (cattrs == null)
1773                                 ReadAttributes ();
1774
1775                         return cattrs.CoClass;
1776                 }
1777
1778                 public string GetAttributeDefaultMember ()
1779                 {
1780                         if (cattrs == null)
1781                                 ReadAttributes ();
1782
1783                         return cattrs.DefaultIndexerName;
1784                 }
1785
1786                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
1787                 {
1788                         if (cattrs == null)
1789                                 ReadAttributes ();
1790
1791                         return cattrs.AttributeUsage;
1792                 }
1793
1794                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
1795                 {
1796                         var a = importer.GetAssemblyDefinition (provider.Module.Assembly);
1797                         return a == assembly || a.IsFriendAssemblyTo (assembly);
1798                 }
1799
1800                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
1801                 {
1802                         //
1803                         // Not interested in members of nested private types unless the importer needs them
1804                         //
1805                         if (declaringType.IsPrivate && importer.IgnorePrivateMembers) {
1806                                 cache = MemberCache.Empty;
1807                                 return;
1808                         }
1809
1810                         var loading_type = (MetaType) provider;
1811                         const BindingFlags all_members = BindingFlags.DeclaredOnly |
1812                                 BindingFlags.Static | BindingFlags.Instance |
1813                                 BindingFlags.Public | BindingFlags.NonPublic;
1814
1815                         const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
1816                                         MethodAttributes.Virtual | MethodAttributes.HideBySig |
1817                                         MethodAttributes.Final;
1818
1819                         Dictionary<MethodBase, MethodSpec> possible_accessors = null;
1820                         List<EventSpec> imported_events = null;
1821                         EventSpec event_spec;
1822                         MemberSpec imported;
1823                         MethodInfo m;
1824                         MemberInfo[] all;
1825                         try {
1826                                 all = loading_type.GetMembers (all_members);
1827                         } catch (Exception e) {
1828                                 throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
1829                                         declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
1830                         }
1831
1832                         if (cache == null) {
1833                                 cache = new MemberCache (all.Length);
1834
1835                                 //
1836                                 // Do the types first as they can be referenced by the members before
1837                                 // they are found or inflated
1838                                 //
1839                                 foreach (var member in all) {
1840                                         if (member.MemberType != MemberTypes.NestedType)
1841                                                 continue;
1842
1843                                         var t = (MetaType) member;
1844
1845                                         // Ignore compiler generated types, mostly lambda containers
1846                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate)
1847                                                 continue;
1848
1849                                         imported = importer.CreateNestedType (t, declaringType);
1850                                         cache.AddMemberImported (imported);
1851                                 }
1852
1853                                 foreach (var member in all) {
1854                                         if (member.MemberType != MemberTypes.NestedType)
1855                                                 continue;
1856
1857                                         var t = (MetaType) member;
1858
1859                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate)
1860                                                 continue;
1861
1862                                         importer.ImportTypeBase (t);
1863                                 }
1864                         }
1865
1866                         if (!onlyTypes) {
1867                                 //
1868                                 // The logic here requires methods to be returned first which seems to work for both Mono and .NET
1869                                 //
1870                                 foreach (var member in all) {
1871                                         switch (member.MemberType) {
1872                                         case MemberTypes.Constructor:
1873                                         case MemberTypes.Method:
1874                                                 MethodBase mb = (MethodBase) member;
1875                                                 var attrs = mb.Attributes;
1876
1877                                                 if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
1878                                                         if (importer.IgnorePrivateMembers)
1879                                                                 continue;
1880
1881                                                         // Ignore explicitly implemented members
1882                                                         if ((attrs & explicit_impl) == explicit_impl)
1883                                                                 continue;
1884
1885                                                         // Ignore compiler generated methods
1886                                                         if (importer.HasAttribute (CustomAttributeData.GetCustomAttributes (mb), "CompilerGeneratedAttribute", MetadataImporter.CompilerServicesNamespace))
1887                                                                 continue;
1888                                                 }
1889
1890                                                 imported = importer.CreateMethod (mb, declaringType);
1891                                                 if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
1892                                                         if (possible_accessors == null)
1893                                                                 possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
1894
1895                                                         // There are no metadata rules for accessors, we have to consider any method as possible candidate
1896                                                         possible_accessors.Add (mb, (MethodSpec) imported);
1897                                                 }
1898
1899                                                 break;
1900                                         case MemberTypes.Property:
1901                                                 if (possible_accessors == null)
1902                                                         continue;
1903
1904                                                 var p = (PropertyInfo) member;
1905                                                 //
1906                                                 // Links possible accessors with property
1907                                                 //
1908                                                 MethodSpec get, set;
1909                                                 m = p.GetGetMethod (true);
1910                                                 if (m == null || !possible_accessors.TryGetValue (m, out get))
1911                                                         get = null;
1912
1913                                                 m = p.GetSetMethod (true);
1914                                                 if (m == null || !possible_accessors.TryGetValue (m, out set))
1915                                                         set = null;
1916
1917                                                 // No accessors registered (e.g. explicit implementation)
1918                                                 if (get == null && set == null)
1919                                                         continue;
1920
1921                                                 imported = importer.CreateProperty (p, declaringType, get, set);
1922                                                 if (imported == null)
1923                                                         continue;
1924
1925                                                 break;
1926                                         case MemberTypes.Event:
1927                                                 if (possible_accessors == null)
1928                                                         continue;
1929
1930                                                 var e = (EventInfo) member;
1931                                                 //
1932                                                 // Links accessors with event
1933                                                 //
1934                                                 MethodSpec add, remove;
1935                                                 m = e.GetAddMethod (true);
1936                                                 if (m == null || !possible_accessors.TryGetValue (m, out add))
1937                                                         add = null;
1938
1939                                                 m = e.GetRemoveMethod (true);
1940                                                 if (m == null || !possible_accessors.TryGetValue (m, out remove))
1941                                                         remove = null;
1942
1943                                                 // Both accessors are required
1944                                                 if (add == null || remove == null)
1945                                                         continue;
1946
1947                                                 event_spec = importer.CreateEvent (e, declaringType, add, remove);
1948                                                 if (!importer.IgnorePrivateMembers) {
1949                                                         if (imported_events == null)
1950                                                                 imported_events = new List<EventSpec> ();
1951
1952                                                         imported_events.Add (event_spec);
1953                                                 }
1954
1955                                                 imported = event_spec;
1956                                                 break;
1957                                         case MemberTypes.Field:
1958                                                 var fi = (FieldInfo) member;
1959
1960                                                 imported = importer.CreateField (fi, declaringType);
1961                                                 if (imported == null)
1962                                                         continue;
1963
1964                                                 //
1965                                                 // For dynamic binder event has to be fully restored to allow operations
1966                                                 // within the type container to work correctly
1967                                                 //
1968                                                 if (imported_events != null) {
1969                                                         // The backing event field should be private but it may not
1970                                                         int index = imported_events.FindIndex (l => l.Name == fi.Name);
1971                                                         if (index >= 0) {
1972                                                                 event_spec = imported_events[index];
1973                                                                 event_spec.BackingField = (FieldSpec) imported;
1974                                                                 imported_events.RemoveAt (index);
1975                                                                 continue;
1976                                                         }
1977                                                 }
1978
1979                                                 break;
1980                                         case MemberTypes.NestedType:
1981                                                 // Already in the cache from the first pass
1982                                                 continue;
1983                                         default:
1984                                                 throw new NotImplementedException (member.ToString ());
1985                                         }
1986
1987                                         cache.AddMemberImported (imported);
1988                                 }
1989                         }
1990
1991                         if (declaringType.IsInterface && declaringType.Interfaces != null) {
1992                                 foreach (var iface in declaringType.Interfaces) {
1993                                         cache.AddInterface (iface);
1994                                 }
1995                         }
1996                 }
1997         }
1998
1999         class ImportedTypeParameterDefinition : ImportedDefinition, ITypeDefinition
2000         {
2001                 public ImportedTypeParameterDefinition (MetaType type, MetadataImporter importer)
2002                         : base (type, importer)
2003                 {
2004                 }
2005
2006                 #region Properties
2007
2008                 public IAssemblyDefinition DeclaringAssembly {
2009                         get {
2010                                 throw new NotImplementedException ();
2011                         }
2012                 }
2013
2014                 public string Namespace {
2015                         get {
2016                                 return null;
2017                         }
2018                 }
2019
2020                 public int TypeParametersCount {
2021                         get {
2022                                 return 0;
2023                         }
2024                 }
2025
2026                 public TypeParameterSpec[] TypeParameters {
2027                         get {
2028                                 return null;
2029                         }
2030                 }
2031
2032                 #endregion
2033
2034                 public TypeSpec GetAttributeCoClass ()
2035                 {
2036                         return null;
2037                 }
2038
2039                 public string GetAttributeDefaultMember ()
2040                 {
2041                         throw new NotSupportedException ();
2042                 }
2043
2044                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2045                 {
2046                         throw new NotSupportedException ();
2047                 }
2048
2049                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2050                 {
2051                         throw new NotImplementedException ();
2052                 }
2053
2054                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2055                 {
2056                         throw new NotImplementedException ();
2057                 }
2058         }
2059 }