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 2009-2011 Novell, Inc
   9 // Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
  10 //
  11
  12 using System;
  13 using System.Runtime.CompilerServices;
  14 using System.Linq;
  15 using System.Collections.Generic;
  16
  17 #if STATIC
  18 using MetaType = IKVM.Reflection.Type;
  19 using IKVM.Reflection;
  20 using IKVM.Reflection.Emit;
  21 #else
  22 using MetaType = System.Type;
  23 using System.Reflection;
  24 using System.Reflection.Emit;
  25 #endif
  26
  27 namespace Mono.CSharp
  28 {
  29         public abstract class MetadataImporter
  30         {
  31                 //
  32                 // Dynamic types reader with additional logic to reconstruct a dynamic
  33                 // type using DynamicAttribute values
  34                 //
  35                 struct DynamicTypeReader
  36                 {
  37                         static readonly bool[] single_attribute = { true };
  38
  39                         public int Position;
  40                         bool[] flags;
  41
  42                         // There is no common type for CustomAttributeData and we cannot
  43                         // use ICustomAttributeProvider
  44                         object provider;
  45
  46                         //
  47                         // A member provider which can be used to get CustomAttributeData
  48                         //
  49                         public DynamicTypeReader (object provider)
  50                         {
  51                                 Position = 0;
  52                                 flags = null;
  53                                 this.provider = provider;
  54                         }
  55
  56                         //
  57                         // Returns true when object at local position has dynamic attribute flag
  58                         //
  59                         public bool IsDynamicObject (MetadataImporter importer)
  60                         {
  61                                 if (provider != null)
  62                                         ReadAttribute (importer);
  63
  64                                 return flags != null && Position < flags.Length && flags[Position];
  65                         }
  66
  67                         //
  68                         // Returns true when DynamicAttribute exists
  69                         //
  70                         public bool HasDynamicAttribute (MetadataImporter importer)
  71                         {
  72                                 if (provider != null)
  73                                         ReadAttribute (importer);
  74
  75                                 return flags != null;
  76                         }
  77
  78                         void ReadAttribute (MetadataImporter importer)
  79                         {
  80                                 IList<CustomAttributeData> cad;
  81                                 if (provider is MemberInfo) {
  82                                         cad = CustomAttributeData.GetCustomAttributes ((MemberInfo) provider);
  83                                 } else if (provider is ParameterInfo) {
  84                                         cad = CustomAttributeData.GetCustomAttributes ((ParameterInfo) provider);
  85                                 } else {
  86                                         provider = null;
  87                                         return;
  88                                 }
  89
  90                                 if (cad.Count > 0) {
  91                                         foreach (var ca in cad) {
  92                                                 var dt = ca.Constructor.DeclaringType;
  93                                                 if (dt.Name != "DynamicAttribute" && dt.Namespace != 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                 readonly ModuleContainer module;
 124
 125                 public static readonly string CompilerServicesNamespace = "System.Runtime.CompilerServices";
 126
 127                 protected MetadataImporter (ModuleContainer module)
 128                 {
 129                         this.module = module;
 130
 131                         import_cache = new Dictionary<MetaType, TypeSpec> (1024, ReferenceEquality<MetaType>.Default);
 132                         compiled_types = new Dictionary<MetaType, TypeSpec> (40, ReferenceEquality<MetaType>.Default);
 133                         assembly_2_definition = new Dictionary<Assembly, IAssemblyDefinition> (ReferenceEquality<Assembly>.Default);
 134                         IgnorePrivateMembers = true;
 135                 }
 136
 137                 #region Properties
 138
 139                 public ICollection<IAssemblyDefinition> Assemblies {
 140                         get {
 141                                 return assembly_2_definition.Values;
 142                         }
 143                 }
 144
 145                 public bool IgnorePrivateMembers { get; set; }
 146
 147                 #endregion
 148
 149                 public abstract void AddCompiledType (TypeBuilder builder, TypeSpec spec);
 150                 protected abstract MemberKind DetermineKindFromBaseType (MetaType baseType);
 151                 protected abstract bool HasVolatileModifier (MetaType[] modifiers);
 152
 153                 public FieldSpec CreateField (FieldInfo fi, TypeSpec declaringType)
 154                 {
 155                         Modifiers mod = 0;
 156                         var fa = fi.Attributes;
 157                         switch (fa & FieldAttributes.FieldAccessMask) {
 158                                 case FieldAttributes.Public:
 159                                         mod = Modifiers.PUBLIC;
 160                                         break;
 161                                 case FieldAttributes.Assembly:
 162                                         mod = Modifiers.INTERNAL;
 163                                         break;
 164                                 case FieldAttributes.Family:
 165                                         mod = Modifiers.PROTECTED;
 166                                         break;
 167                                 case FieldAttributes.FamORAssem:
 168                                         mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 169                                         break;
 170                                 default:
 171                                         // Ignore private fields (even for error reporting) to not require extra dependencies
 172                                         if ((IgnorePrivateMembers && !declaringType.IsStruct) ||
 173                                                 HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "CompilerGeneratedAttribute", CompilerServicesNamespace))
 174                                                 return null;
 175
 176                                         mod = Modifiers.PRIVATE;
 177                                         break;
 178                         }
 179
 180                         TypeSpec field_type;
 181
 182                         try {
 183                                 field_type = ImportType (fi.FieldType, new DynamicTypeReader (fi));
 184                         } catch (Exception e) {
 185                                 // TODO: I should construct fake TypeSpec based on TypeRef signature
 186                                 // but there is no way to do it with System.Reflection
 187                                 throw new InternalErrorException (e, "Cannot import field `{0}.{1}' referenced in assembly `{2}'",
 188                                         declaringType.GetSignatureForError (), fi.Name, declaringType.MemberDefinition.DeclaringAssembly);
 189                         }
 190
 191                         var definition = new ImportedMemberDefinition (fi, field_type, this);
 192
 193                         if ((fa & FieldAttributes.Literal) != 0) {
 194                                 var c = Constant.CreateConstantFromValue (field_type, fi.GetRawConstantValue (), Location.Null);
 195                                 return new ConstSpec (declaringType, definition, field_type, fi, mod, c);
 196                         }
 197
 198                         if ((fa & FieldAttributes.InitOnly) != 0) {
 199                                 if (field_type.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 200                                         var dc = ReadDecimalConstant (CustomAttributeData.GetCustomAttributes (fi));
 201                                         if (dc != null)
 202                                                 return new ConstSpec (declaringType, definition, field_type, fi, mod, dc);
 203                                 }
 204
 205                                 mod |= Modifiers.READONLY;
 206                         } else {
 207                                 var req_mod = fi.GetRequiredCustomModifiers ();
 208                                 if (req_mod.Length > 0 && HasVolatileModifier (req_mod))
 209                                         mod |= Modifiers.VOLATILE;
 210                         }
 211
 212                         if ((fa & FieldAttributes.Static) != 0) {
 213                                 mod |= Modifiers.STATIC;
 214                         } else {
 215                                 // Fixed buffers cannot be static
 216                                 if (declaringType.IsStruct && field_type.IsStruct && field_type.IsNested &&
 217                                         HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "FixedBufferAttribute", CompilerServicesNamespace)) {
 218
 219                                         // TODO: Sanity check on field_type (only few types are allowed)
 220                                         var element_field = CreateField (fi.FieldType.GetField (FixedField.FixedElementName), declaringType);
 221                                         return new FixedFieldSpec (declaringType, definition, fi, element_field, mod);
 222                                 }
 223                         }
 224
 225                         return new FieldSpec (declaringType, definition, field_type, fi, mod);
 226                 }
 227
 228                 public EventSpec CreateEvent (EventInfo ei, TypeSpec declaringType, MethodSpec add, MethodSpec remove)
 229                 {
 230                         add.IsAccessor = true;
 231                         remove.IsAccessor = true;
 232
 233                         if (add.Modifiers != remove.Modifiers)
 234                                 throw new NotImplementedException ("Different accessor modifiers " + ei.Name);
 235
 236                         var event_type = ImportType (ei.EventHandlerType, new DynamicTypeReader (ei));
 237                         var definition = new ImportedMemberDefinition (ei, event_type,  this);
 238                         return new EventSpec (declaringType, definition, event_type, add.Modifiers, add, remove);
 239                 }
 240
 241                 TypeParameterSpec[] CreateGenericParameters (MetaType type, TypeSpec declaringType)
 242                 {
 243                         var tparams = type.GetGenericArguments ();
 244
 245                         int parent_owned_count;
 246                         if (type.IsNested) {
 247                                 parent_owned_count = type.DeclaringType.GetGenericArguments ().Length;
 248
 249                                 //
 250                                 // System.Reflection duplicates parent type parameters for each
 251                                 // nested type with slightly modified properties (eg. different owner)
 252                                 // This just makes things more complicated (think of cloned constraints)
 253                                 // therefore we remap any nested type owned by parent using `type_cache'
 254                                 // to the single TypeParameterSpec
 255                                 //
 256                                 if (declaringType != null && parent_owned_count > 0) {
 257                                         int read_count = 0;
 258                                         while (read_count != parent_owned_count) {
 259                                                 var tparams_count = declaringType.Arity;
 260                                                 if (tparams_count != 0) {
 261                                                         var parent_tp = declaringType.MemberDefinition.TypeParameters;
 262                                                         read_count += tparams_count;
 263                                                         for (int i = 0; i < tparams_count; i++) {
 264                                                                 import_cache.Add (tparams[parent_owned_count - read_count + i], parent_tp[i]);
 265                                                         }
 266                                                 }
 267
 268                                                 declaringType = declaringType.DeclaringType;
 269                                         }
 270                                 }
 271                         } else {
 272                                 parent_owned_count = 0;
 273                         }
 274
 275                         if (tparams.Length - parent_owned_count == 0)
 276                                 return null;
 277
 278                         return CreateGenericParameters (parent_owned_count, tparams);
 279                 }
 280
 281                 TypeParameterSpec[] CreateGenericParameters (int first, MetaType[] tparams)
 282                 {
 283                         var tspec = new TypeParameterSpec[tparams.Length - first];
 284                         for (int pos = first; pos < tparams.Length; ++pos) {
 285                                 var type = tparams[pos];
 286                                 int index = pos - first;
 287
 288                                 tspec[index] = (TypeParameterSpec) CreateType (type, new DynamicTypeReader (), false);
 289                         }
 290
 291                         return tspec;
 292                 }
 293
 294                 TypeSpec[] CreateGenericArguments (int first, MetaType[] tparams, DynamicTypeReader dtype)
 295                 {
 296                         ++dtype.Position;
 297
 298                         var tspec = new TypeSpec [tparams.Length - first];
 299                         for (int pos = first; pos < tparams.Length; ++pos) {
 300                                 var type = tparams[pos];
 301                                 int index = pos - first;
 302
 303                                 TypeSpec spec;
 304                                 if (type.HasElementType) {
 305                                         var element = type.GetElementType ();
 306                                         ++dtype.Position;
 307                                         spec = ImportType (element, dtype);
 308
 309                                         if (!type.IsArray) {
 310                                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
 311                                         }
 312
 313                                         spec = ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
 314                                 } else {
 315                                         spec = CreateType (type, dtype, true);
 316
 317                                         //
 318                                         // We treat nested generic types as inflated internally where
 319                                         // reflection uses type definition
 320                                         //
 321                                         // class A<T> {
 322                                         //    IFoo<A<T>> foo;   // A<T> is definition in this case
 323                                         // }
 324                                         //
 325                                         // TODO: Is full logic from CreateType needed here as well?
 326                                         //
 327                                         if (!IsMissingType (type) && type.IsGenericTypeDefinition) {
 328                                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 329                                                 spec = spec.MakeGenericType (module, targs);
 330                                         }
 331                                 }
 332
 333                                 ++dtype.Position;
 334                                 tspec[index] = spec;
 335                         }
 336
 337                         return tspec;
 338                 }
 339
 340                 public MethodSpec CreateMethod (MethodBase mb, TypeSpec declaringType)
 341                 {
 342                         Modifiers mod = ReadMethodModifiers (mb, declaringType);
 343                         TypeParameterSpec[] tparams;
 344
 345                         var parameters = CreateParameters (declaringType, mb.GetParameters (), mb);
 346
 347                         if (mb.IsGenericMethod) {
 348                                 if (!mb.IsGenericMethodDefinition)
 349                                         throw new NotSupportedException ("assert");
 350
 351                                 tparams = CreateGenericParameters (0, mb.GetGenericArguments ());
 352                         } else {
 353                                 tparams = null;
 354                         }
 355
 356                         MemberKind kind;
 357                         TypeSpec returnType;
 358                         if (mb.MemberType == MemberTypes.Constructor) {
 359                                 kind = MemberKind.Constructor;
 360                                 returnType = module.Compiler.BuiltinTypes.Void;
 361                         } else {
 362                                 //
 363                                 // Detect operators and destructors
 364                                 //
 365                                 string name = mb.Name;
 366                                 kind = MemberKind.Method;
 367                                 if (tparams == null && !mb.DeclaringType.IsInterface && name.Length > 6) {
 368                                         if ((mod & (Modifiers.STATIC | Modifiers.PUBLIC)) == (Modifiers.STATIC | Modifiers.PUBLIC)) {
 369                                                 if (name[2] == '_' && name[1] == 'p' && name[0] == 'o') {
 370                                                         var op_type = Operator.GetType (name);
 371                                                         if (op_type.HasValue && parameters.Count > 0 && parameters.Count < 3) {
 372                                                                 kind = MemberKind.Operator;
 373                                                         }
 374                                                 }
 375                                         } else if (parameters.IsEmpty && name == Destructor.MetadataName) {
 376                                                 kind = MemberKind.Destructor;
 377                                                 if (declaringType.BuiltinType == BuiltinTypeSpec.Type.Object) {
 378                                                         mod &= ~Modifiers.OVERRIDE;
 379                                                         mod |= Modifiers.VIRTUAL;
 380                                                 }
 381                                         }
 382                                 }
 383
 384                                 var mi = (MethodInfo) mb;
 385                                 returnType = ImportType (mi.ReturnType, new DynamicTypeReader (mi.ReturnParameter));
 386
 387                                 // Cannot set to OVERRIDE without full hierarchy checks
 388                                 // this flag indicates that the method could be override
 389                                 // but further validation is needed
 390                                 if ((mod & Modifiers.OVERRIDE) != 0) {
 391                                         bool is_real_override = false;
 392                                         if (kind == MemberKind.Method && declaringType.BaseType != null) {
 393                                                 var filter = MemberFilter.Method (name, tparams != null ? tparams.Length : 0, parameters, null);
 394                                                 var candidate = MemberCache.FindMember (declaringType.BaseType, filter, BindingRestriction.None);
 395
 396                                                 //
 397                                                 // For imported class method do additional validation to be sure that metadata
 398                                                 // override flag was correct
 399                                                 //
 400                                                 // Difference between protected internal and protected is ok
 401                                                 //
 402                                                 const Modifiers conflict_mask = Modifiers.AccessibilityMask & ~Modifiers.INTERNAL;
 403                                                 if (candidate != null && (candidate.Modifiers & conflict_mask) == (mod & conflict_mask) && !candidate.IsStatic) {
 404                                                         is_real_override = true;
 405                                                 }
 406                                         }
 407
 408                                         if (!is_real_override) {
 409                                                 mod &= ~Modifiers.OVERRIDE;
 410                                                 if ((mod & Modifiers.SEALED) != 0)
 411                                                         mod &= ~Modifiers.SEALED;
 412                                                 else
 413                                                         mod |= Modifiers.VIRTUAL;
 414                                         }
 415                                 }
 416                         }
 417
 418                         IMemberDefinition definition;
 419                         if (tparams != null) {
 420                                 var gmd = new ImportedGenericMethodDefinition ((MethodInfo) mb, returnType, parameters, tparams, this);
 421                                 foreach (var tp in gmd.TypeParameters) {
 422                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
 423                                 }
 424
 425                                 definition = gmd;
 426                         } else {
 427                                 definition = new ImportedParameterMemberDefinition (mb, returnType, parameters, this);
 428                         }
 429
 430                         MethodSpec ms = new MethodSpec (kind, declaringType, definition, returnType, mb, parameters, mod);
 431                         if (tparams != null)
 432                                 ms.IsGeneric = true;
 433
 434                         return ms;
 435                 }
 436
 437                 //
 438                 // Imports System.Reflection parameters
 439                 //
 440                 AParametersCollection CreateParameters (TypeSpec parent, ParameterInfo[] pi, MethodBase method)
 441                 {
 442                         int varargs = method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0 ? 1 : 0;
 443
 444                         if (pi.Length == 0 && varargs == 0)
 445                                 return ParametersCompiled.EmptyReadOnlyParameters;
 446
 447                         TypeSpec[] types = new TypeSpec[pi.Length + varargs];
 448                         IParameterData[] par = new IParameterData[pi.Length + varargs];
 449                         bool is_params = false;
 450                         for (int i = 0; i < pi.Length; i++) {
 451                                 ParameterInfo p = pi[i];
 452                                 Parameter.Modifier mod = 0;
 453                                 Expression default_value = null;
 454                                 if (p.ParameterType.IsByRef) {
 455                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 456                                                 mod = Parameter.Modifier.OUT;
 457                                         else
 458                                                 mod = Parameter.Modifier.REF;
 459
 460                                         //
 461                                         // Strip reference wrapping
 462                                         //
 463                                         var el = p.ParameterType.GetElementType ();
 464                                         types[i] = ImportType (el, new DynamicTypeReader (p));  // TODO: 1-based positio to be csc compatible
 465                                 } else if (i == 0 && method.IsStatic && parent.IsStatic && parent.MemberDefinition.DeclaringAssembly.HasExtensionMethod &&
 466                                         HasAttribute (CustomAttributeData.GetCustomAttributes (method), "ExtensionAttribute", CompilerServicesNamespace)) {
 467                                         mod = Parameter.Modifier.This;
 468                                         types[i] = ImportType (p.ParameterType);
 469                                 } else {
 470                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 471
 472                                         if (i >= pi.Length - 2 && types[i] is ArrayContainer) {
 473                                                 if (HasAttribute (CustomAttributeData.GetCustomAttributes (p), "ParamArrayAttribute", "System")) {
 474                                                         mod = Parameter.Modifier.PARAMS;
 475                                                         is_params = true;
 476                                                 }
 477                                         }
 478
 479                                         if (!is_params && p.IsOptional) {
 480                                                 object value = p.RawDefaultValue;
 481                                                 var ptype = types[i];
 482                                                 if ((p.Attributes & ParameterAttributes.HasDefault) != 0 && ptype.Kind != MemberKind.TypeParameter && (value != null || TypeSpec.IsReferenceType (ptype))) {
 483                                                         if (value == null) {
 484                                                                 default_value = Constant.CreateConstant (ptype, null, Location.Null);
 485                                                         } else {
 486                                                                 default_value = ImportParameterConstant (value);
 487
 488                                                                 if (ptype.IsEnum) {
 489                                                                         default_value = new EnumConstant ((Constant) default_value, ptype);
 490                                                                 }
 491                                                         }
 492                                                 } else if (value == Missing.Value) {
 493                                                         default_value = EmptyExpression.MissingValue;
 494                                                 } else if (value == null) {
 495                                                         default_value = new DefaultValueExpression (new TypeExpression (ptype, Location.Null), Location.Null);
 496                                                 } else if (ptype.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 497                                                         default_value = ImportParameterConstant (value);
 498                                                 }
 499                                         }
 500                                 }
 501
 502                                 par[i] = new ParameterData (p.Name, mod, default_value);
 503                         }
 504
 505                         if (varargs != 0) {
 506                                 par[par.Length - 1] = new ArglistParameter (Location.Null);
 507                                 types[types.Length - 1] = InternalType.Arglist;
 508                         }
 509
 510                         return method != null ?
 511                                 new ParametersImported (par, types, varargs != 0, is_params) :
 512                                 new ParametersImported (par, types, is_params);
 513                 }
 514
 515                 //
 516                 // Returns null when the property is not valid C# property
 517                 //
 518                 public PropertySpec CreateProperty (PropertyInfo pi, TypeSpec declaringType, MethodSpec get, MethodSpec set)
 519                 {
 520                         Modifiers mod = 0;
 521                         AParametersCollection param = null;
 522                         TypeSpec type = null;
 523                         if (get != null) {
 524                                 mod = get.Modifiers;
 525                                 param = get.Parameters;
 526                                 type = get.ReturnType;
 527                         }
 528
 529                         bool is_valid_property = true;
 530                         if (set != null) {
 531                                 if (set.ReturnType.Kind != MemberKind.Void)
 532                                         is_valid_property = false;
 533
 534                                 var set_param_count = set.Parameters.Count - 1;
 535
 536                                 if (set_param_count < 0) {
 537                                         set_param_count = 0;
 538                                         is_valid_property = false;
 539                                 }
 540
 541                                 var set_type = set.Parameters.Types[set_param_count];
 542
 543                                 if (mod == 0) {
 544                                         AParametersCollection set_based_param;
 545
 546                                         if (set_param_count == 0) {
 547                                                 set_based_param = ParametersCompiled.EmptyReadOnlyParameters;
 548                                         } else {
 549                                                 //
 550                                                 // Create indexer parameters based on setter method parameters (the last parameter has to be removed)
 551                                                 //
 552                                                 var data = new IParameterData[set_param_count];
 553                                                 var types = new TypeSpec[set_param_count];
 554                                                 Array.Copy (set.Parameters.FixedParameters, data, set_param_count);
 555                                                 Array.Copy (set.Parameters.Types, types, set_param_count);
 556                                                 set_based_param = new ParametersImported (data, types, set.Parameters.HasParams);
 557                                         }
 558
 559                                         mod = set.Modifiers;
 560                                         param = set_based_param;
 561                                         type = set_type;
 562                                 } else {
 563                                         if (set_param_count != get.Parameters.Count)
 564                                                 is_valid_property = false;
 565
 566                                         if (get.ReturnType != set_type)
 567                                                 is_valid_property = false;
 568
 569                                         // Possible custom accessor modifiers
 570                                         if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
 571                                                 var get_acc = mod & Modifiers.AccessibilityMask;
 572                                                 if (get_acc != Modifiers.PUBLIC) {
 573                                                         var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
 574                                                         // If the accessor modifiers are not same, do extra restriction checks
 575                                                         if (get_acc != set_acc) {
 576                                                                 var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
 577                                                                 var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
 578                                                                 if (get_restr && set_restr) {
 579                                                                         is_valid_property = false; // Neither is more restrictive
 580                                                                 }
 581
 582                                                                 if (get_restr) {
 583                                                                         mod &= ~Modifiers.AccessibilityMask;
 584                                                                         mod |= set_acc;
 585                                                                 }
 586                                                         }
 587                                                 }
 588                                         }
 589                                 }
 590                         }
 591
 592                         PropertySpec spec = null;
 593                         if (!param.IsEmpty) {
 594                                 var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
 595                                 if (index_name == null) {
 596                                         is_valid_property = false;
 597                                 } else {
 598                                         if (get != null) {
 599                                                 if (get.IsStatic)
 600                                                         is_valid_property = false;
 601                                                 if (get.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 602                                                         is_valid_property = false;
 603                                         }
 604                                         if (set != null) {
 605                                                 if (set.IsStatic)
 606                                                         is_valid_property = false;
 607                                                 if (set.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 608                                                         is_valid_property = false;
 609                                         }
 610                                 }
 611
 612                                 if (is_valid_property)
 613                                         spec = new IndexerSpec (declaringType, new ImportedParameterMemberDefinition (pi, type, param, this), type, param, pi, mod);
 614                         }
 615
 616                         if (spec == null)
 617                                 spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi, type, this), type, pi, mod);
 618
 619                         if (!is_valid_property) {
 620                                 spec.IsNotCSharpCompatible = true;
 621                                 return spec;
 622                         }
 623
 624                         if (set != null)
 625                                 spec.Set = set;
 626                         if (get != null)
 627                                 spec.Get = get;
 628
 629                         return spec;
 630                 }
 631
 632                 public TypeSpec CreateType (MetaType type)
 633                 {
 634                         return CreateType (type, new DynamicTypeReader (), true);
 635                 }
 636
 637                 public TypeSpec CreateNestedType (MetaType type, TypeSpec declaringType)
 638                 {
 639                         return CreateType (type, declaringType, new DynamicTypeReader (type), false);
 640                 }
 641
 642                 TypeSpec CreateType (MetaType type, DynamicTypeReader dtype, bool canImportBaseType)
 643                 {
 644                         TypeSpec declaring_type;
 645                         if (type.IsNested && !type.IsGenericParameter)
 646                                 declaring_type = CreateType (type.DeclaringType, new DynamicTypeReader (type.DeclaringType), true);
 647                         else
 648                                 declaring_type = null;
 649
 650                         return CreateType (type, declaring_type, dtype, canImportBaseType);
 651                 }
 652
 653                 TypeSpec CreateType (MetaType type, TypeSpec declaringType, DynamicTypeReader dtype, bool canImportBaseType)
 654                 {
 655                         TypeSpec spec;
 656                         if (import_cache.TryGetValue (type, out spec)) {
 657                                 if (spec.BuiltinType == BuiltinTypeSpec.Type.Object) {
 658                                         if (dtype.IsDynamicObject (this))
 659                                                 return module.Compiler.BuiltinTypes.Dynamic;
 660
 661                                         return spec;
 662                                 }
 663
 664                                 if (!spec.IsGeneric || type.IsGenericTypeDefinition)
 665                                         return spec;
 666
 667                                 if (!dtype.HasDynamicAttribute (this))
 668                                         return spec;
 669
 670                                 // We've found same object in the cache but this one has a dynamic custom attribute
 671                                 // and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
 672                                 // Do type resolve process again in that case
 673
 674                                 // TODO: Handle cases where they still unify
 675                         }
 676
 677                         if (IsMissingType (type)) {
 678                                 spec = new TypeSpec (MemberKind.MissingType, declaringType, new ImportedTypeDefinition (type, this), type, Modifiers.PUBLIC);
 679                                 spec.MemberCache = MemberCache.Empty;
 680                                 import_cache.Add (type, spec);
 681                                 return spec;
 682                         }
 683
 684                         if (type.IsGenericType && !type.IsGenericTypeDefinition) {
 685                                 var type_def = type.GetGenericTypeDefinition ();
 686
 687                                 // Generic type definition can also be forwarded
 688                                 if (compiled_types.TryGetValue (type_def, out spec))
 689                                         return spec;
 690
 691                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 692                                 if (declaringType == null) {
 693                                         // Simple case, no nesting
 694                                         spec = CreateType (type_def, null, new DynamicTypeReader (), canImportBaseType);
 695                                         spec = spec.MakeGenericType (module, targs);
 696                                 } else {
 697                                         //
 698                                         // Nested type case, converting .NET types like
 699                                         // A`1.B`1.C`1<int, long, string> to typespec like
 700                                         // A<int>.B<long>.C<string>
 701                                         //
 702                                         var nested_hierarchy = new List<TypeSpec> ();
 703                                         while (declaringType.IsNested) {
 704                                                 nested_hierarchy.Add (declaringType);
 705                                                 declaringType = declaringType.DeclaringType;
 706                                         }
 707
 708                                         int targs_pos = 0;
 709                                         if (declaringType.Arity > 0) {
 710                                                 spec = declaringType.MakeGenericType (module, targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
 711                                                 targs_pos = spec.Arity;
 712                                         } else {
 713                                                 spec = declaringType;
 714                                         }
 715
 716                                         for (int i = nested_hierarchy.Count; i != 0; --i) {
 717                                                 var t = nested_hierarchy [i - 1];
 718                                                 spec = MemberCache.FindNestedType (spec, t.Name, t.Arity);
 719                                                 if (t.Arity > 0) {
 720                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
 721                                                         targs_pos += t.Arity;
 722                                                 }
 723                                         }
 724
 725                                         string name = type.Name;
 726                                         int index = name.IndexOf ('`');
 727                                         if (index > 0)
 728                                                 name = name.Substring (0, index);
 729
 730                                         spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos);
 731                                         if (spec == null)
 732                                                 return null;
 733
 734                                         if (spec.Arity > 0) {
 735                                                 spec = spec.MakeGenericType (module, targs.Skip (targs_pos).ToArray ());
 736                                         }
 737                                 }
 738
 739                                 // Don't add generic type with dynamic arguments, they can interfere with same type
 740                                 // using object type arguments
 741                                 if (!spec.HasDynamicElement) {
 742
 743                                         // Add to reading cache to speed up reading
 744                                         if (!import_cache.ContainsKey (type))
 745                                                 import_cache.Add (type, spec);
 746                                 }
 747
 748                                 return spec;
 749                         }
 750
 751                         Modifiers mod;
 752                         MemberKind kind;
 753
 754                         var ma = type.Attributes;
 755                         switch (ma & TypeAttributes.VisibilityMask) {
 756                         case TypeAttributes.Public:
 757                         case TypeAttributes.NestedPublic:
 758                                 mod = Modifiers.PUBLIC;
 759                                 break;
 760                         case TypeAttributes.NestedPrivate:
 761                                 mod = Modifiers.PRIVATE;
 762                                 break;
 763                         case TypeAttributes.NestedFamily:
 764                                 mod = Modifiers.PROTECTED;
 765                                 break;
 766                         case TypeAttributes.NestedFamORAssem:
 767                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 768                                 break;
 769                         default:
 770                                 mod = Modifiers.INTERNAL;
 771                                 break;
 772                         }
 773
 774                         if ((ma & TypeAttributes.Interface) != 0) {
 775                                 kind = MemberKind.Interface;
 776                         } else if (type.IsGenericParameter) {
 777                                 kind = MemberKind.TypeParameter;
 778                         } else {
 779                                 var base_type = type.BaseType;
 780                                 if (base_type == null || (ma & TypeAttributes.Abstract) != 0) {
 781                                         kind = MemberKind.Class;
 782                                 } else {
 783                                         kind = DetermineKindFromBaseType (base_type);
 784                                         if (kind == MemberKind.Struct || kind == MemberKind.Delegate) {
 785                                                 mod |= Modifiers.SEALED;
 786                                         }
 787                                 }
 788
 789                                 if (kind == MemberKind.Class) {
 790                                         if ((ma & TypeAttributes.Sealed) != 0) {
 791                                                 mod |= Modifiers.SEALED;
 792                                                 if ((ma & TypeAttributes.Abstract) != 0)
 793                                                         mod |= Modifiers.STATIC;
 794                                         } else if ((ma & TypeAttributes.Abstract) != 0) {
 795                                                 mod |= Modifiers.ABSTRACT;
 796                                         }
 797                                 }
 798                         }
 799
 800                         var definition = new ImportedTypeDefinition (type, this);
 801                         TypeSpec pt;
 802
 803                         if (kind == MemberKind.Enum) {
 804                                 const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
 805                                         BindingFlags.Instance |
 806                                         BindingFlags.Public | BindingFlags.NonPublic;
 807
 808                                 var type_members = type.GetFields (underlying_member);
 809                                 foreach (var type_member in type_members) {
 810                                         spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
 811                                         break;
 812                                 }
 813
 814                                 if (spec == null)
 815                                         kind = MemberKind.Class;
 816
 817                         } else if (kind == MemberKind.TypeParameter) {
 818                                 spec = CreateTypeParameter (type, declaringType);
 819                         } else if (type.IsGenericTypeDefinition) {
 820                                 definition.TypeParameters = CreateGenericParameters (type, declaringType);
 821                         } else if (compiled_types.TryGetValue (type, out pt)) {
 822                                 //
 823                                 // Same type was found in inside compiled types. It's
 824                                 // either build-in type or forward referenced typed
 825                                 // which point into just compiled assembly.
 826                                 //
 827                                 spec = pt;
 828                                 BuiltinTypeSpec bts = pt as BuiltinTypeSpec;
 829                                 if (bts != null)
 830                                         bts.SetDefinition (definition, type, mod);
 831                         }
 832
 833                         if (spec == null)
 834                                 spec = new TypeSpec (kind, declaringType, definition, type, mod);
 835
 836                         import_cache.Add (type, spec);
 837
 838                         if (kind == MemberKind.TypeParameter) {
 839                                 if (canImportBaseType)
 840                                         ImportTypeParameterTypeConstraints ((TypeParameterSpec) spec, type);
 841
 842                                 return spec;
 843                         }
 844
 845                         //
 846                         // Two stage setup as the base type can be inflated declaring type or
 847                         // another nested type inside same declaring type which has not been
 848                         // loaded, therefore we can import a base type of nested types once
 849                         // the types have been imported
 850                         //
 851                         if (canImportBaseType)
 852                                 ImportTypeBase (spec, type);
 853
 854                         return spec;
 855                 }
 856
 857                 public IAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
 858                 {
 859                         IAssemblyDefinition found;
 860                         if (!assembly_2_definition.TryGetValue (assembly, out found)) {
 861
 862                                 // This can happen in dynamic context only
 863                                 var def = new ImportedAssemblyDefinition (assembly);
 864                                 assembly_2_definition.Add (assembly, def);
 865                                 def.ReadAttributes ();
 866                                 found = def;
 867                         }
 868
 869                         return found;
 870                 }
 871
 872                 public void ImportTypeBase (MetaType type)
 873                 {
 874                         TypeSpec spec = import_cache[type];
 875                         if (spec != null)
 876                                 ImportTypeBase (spec, type);
 877                 }
 878
 879                 TypeParameterSpec CreateTypeParameter (MetaType type, TypeSpec declaringType)
 880                 {
 881                         Variance variance;
 882                         switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
 883                         case GenericParameterAttributes.Covariant:
 884                                 variance = Variance.Covariant;
 885                                 break;
 886                         case GenericParameterAttributes.Contravariant:
 887                                 variance = Variance.Contravariant;
 888                                 break;
 889                         default:
 890                                 variance = Variance.None;
 891                                 break;
 892                         }
 893
 894                         SpecialConstraint special = SpecialConstraint.None;
 895                         var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
 896
 897                         if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
 898                                 special |= SpecialConstraint.Struct;
 899                         } else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
 900                                 special = SpecialConstraint.Constructor;
 901                         }
 902
 903                         if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
 904                                 special |= SpecialConstraint.Class;
 905                         }
 906
 907                         TypeParameterSpec spec;
 908                         var def = new ImportedTypeParameterDefinition (type, this);
 909                         if (type.DeclaringMethod != null) {
 910                                 spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
 911                         } else {
 912                                 spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
 913                         }
 914
 915                         return spec;
 916                 }
 917
 918                 //
 919                 // Test for a custom attribute type match. Custom attributes are not really predefined globaly
 920                 // they can be assembly specific therefore we do check based on names only
 921                 //
 922                 public static bool HasAttribute (IList<CustomAttributeData> attributesData, string attrName, string attrNamespace)
 923                 {
 924                         if (attributesData.Count == 0)
 925                                 return false;
 926
 927                         foreach (var attr in attributesData) {
 928                                 var dt = attr.Constructor.DeclaringType;
 929                                 if (dt.Name == attrName && dt.Namespace == 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 = module.Compiler.BuiltinTypes.Object;
 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                                         var it = CreateType (iface);
 956                                         if (it == null)
 957                                                 continue;
 958
 959                                         spec.AddInterface (it);
 960
 961                                         // Unfortunately not all languages expand inherited interfaces
 962                                         var bifaces = it.Interfaces;
 963                                         if (bifaces != null) {
 964                                                 foreach (var biface in bifaces) {
 965                                                         spec.AddInterface (biface);
 966                                                 }
 967                                         }
 968                                 }
 969                         }
 970
 971                         if (spec.BaseType != null) {
 972                                 var bifaces = spec.BaseType.Interfaces;
 973                                 if (bifaces != null) {
 974                                         //
 975                                         // Before adding base class interfaces close defined interfaces
 976                                         // on type parameter
 977                                         //
 978                                         var tp = spec as TypeParameterSpec;
 979                                         if (tp != null && tp.InterfacesDefined == null) {
 980                                                 tp.InterfacesDefined = TypeSpec.EmptyTypes;
 981                                         }
 982
 983                                         foreach (var iface in bifaces)
 984                                                 spec.AddInterface (iface);
 985                                 }
 986                         }
 987 #else
 988                         ifaces = type.GetInterfaces ();
 989
 990                         if (ifaces.Length > 0) {
 991                                 foreach (var iface in ifaces) {
 992                                         spec.AddInterface (CreateType (iface));
 993                                 }
 994                         }
 995 #endif
 996
 997                         if (spec.MemberDefinition.TypeParametersCount > 0) {
 998                                 foreach (var tp in spec.MemberDefinition.TypeParameters) {
 999                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
1000                                 }
1001                         }
1002                 }
1003
1004                 protected void ImportTypes (MetaType[] types, Namespace targetNamespace, bool hasExtensionTypes)
1005                 {
1006                         Namespace ns = targetNamespace;
1007                         string prev_namespace = null;
1008                         foreach (var t in types) {
1009                                 if (t == null)
1010                                         continue;
1011
1012                                 // Be careful not to trigger full parent type loading
1013                                 if (t.MemberType == MemberTypes.NestedType)
1014                                         continue;
1015
1016                                 if (t.Name[0] == '<')
1017                                         continue;
1018
1019                                 var it = CreateType (t, null, new DynamicTypeReader (t), true);
1020                                 if (it == null)
1021                                         continue;
1022
1023                                 if (prev_namespace != t.Namespace) {
1024                                         ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
1025                                         prev_namespace = t.Namespace;
1026                                 }
1027
1028                                 ns.AddType (module, it);
1029
1030                                 if (it.IsStatic && hasExtensionTypes &&
1031                                         HasAttribute (CustomAttributeData.GetCustomAttributes (t), "ExtensionAttribute", CompilerServicesNamespace)) {
1032                                         it.SetExtensionMethodContainer ();
1033                                 }
1034                         }
1035                 }
1036
1037                 void ImportTypeParameterTypeConstraints (TypeParameterSpec spec, MetaType type)
1038                 {
1039                         var constraints = type.GetGenericParameterConstraints ();
1040                         List<TypeSpec> tparams = null;
1041                         foreach (var ct in constraints) {
1042                                 if (ct.IsGenericParameter) {
1043                                         if (tparams == null)
1044                                                 tparams = new List<TypeSpec> ();
1045
1046                                         tparams.Add (CreateType (ct));
1047                                         continue;
1048                                 }
1049
1050                                 if (!IsMissingType (ct) && ct.IsClass) {
1051                                         spec.BaseType = CreateType (ct);
1052                                         continue;
1053                                 }
1054
1055                                 spec.AddInterface (CreateType (ct));
1056                         }
1057
1058                         if (spec.BaseType == null)
1059                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1060
1061                         if (tparams != null)
1062                                 spec.TypeArguments = tparams.ToArray ();
1063                 }
1064
1065                 Constant ImportParameterConstant (object value)
1066                 {
1067                         //
1068                         // Get type of underlying value as int constant can be used for object
1069                         // parameter type. This is not allowed in C# but other languages can do that
1070                         //
1071                         var types = module.Compiler.BuiltinTypes;
1072                         switch (System.Type.GetTypeCode (value.GetType ())) {
1073                         case TypeCode.Boolean:
1074                                 return new BoolConstant (types, (bool) value, Location.Null);
1075                         case TypeCode.Byte:
1076                                 return new ByteConstant (types, (byte) value, Location.Null);
1077                         case TypeCode.Char:
1078                                 return new CharConstant (types, (char) value, Location.Null);
1079                         case TypeCode.Decimal:
1080                                 return new DecimalConstant (types, (decimal) value, Location.Null);
1081                         case TypeCode.Double:
1082                                 return new DoubleConstant (types, (double) value, Location.Null);
1083                         case TypeCode.Int16:
1084                                 return new ShortConstant (types, (short) value, Location.Null);
1085                         case TypeCode.Int32:
1086                                 return new IntConstant (types, (int) value, Location.Null);
1087                         case TypeCode.Int64:
1088                                 return new LongConstant (types, (long) value, Location.Null);
1089                         case TypeCode.SByte:
1090                                 return new SByteConstant (types, (sbyte) value, Location.Null);
1091                         case TypeCode.Single:
1092                                 return new FloatConstant (types, (float) value, Location.Null);
1093                         case TypeCode.String:
1094                                 return new StringConstant (types, (string) value, Location.Null);
1095                         case TypeCode.UInt16:
1096                                 return new UShortConstant (types, (ushort) value, Location.Null);
1097                         case TypeCode.UInt32:
1098                                 return new UIntConstant (types, (uint) value, Location.Null);
1099                         case TypeCode.UInt64:
1100                                 return new ULongConstant (types, (ulong) value, Location.Null);
1101                         }
1102
1103                         throw new NotImplementedException (value.GetType ().ToString ());
1104                 }
1105
1106                 public TypeSpec ImportType (MetaType type)
1107                 {
1108                         return ImportType (type, new DynamicTypeReader (type));
1109                 }
1110
1111                 TypeSpec ImportType (MetaType type, DynamicTypeReader dtype)
1112                 {
1113                         if (type.HasElementType) {
1114                                 var element = type.GetElementType ();
1115                                 ++dtype.Position;
1116                                 var spec = ImportType (element, dtype);
1117
1118                                 if (type.IsArray)
1119                                         return ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
1120                                 if (type.IsByRef)
1121                                         return ReferenceContainer.MakeType (module, spec);
1122                                 if (type.IsPointer)
1123                                         return PointerContainer.MakeType (module, spec);
1124
1125                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
1126                         }
1127
1128                         return CreateType (type, dtype, true);
1129                 }
1130
1131                 static bool IsMissingType (MetaType type)
1132                 {
1133 #if STATIC
1134                         return type.__IsMissing;
1135 #else
1136                         return false;
1137 #endif
1138                 }
1139
1140                 //
1141                 // Decimal constants cannot be encoded in the constant blob, and thus are marked
1142                 // as IsInitOnly ('readonly' in C# parlance).  We get its value from the
1143                 // DecimalConstantAttribute metadata.
1144                 //
1145                 Constant ReadDecimalConstant (IList<CustomAttributeData> attrs)
1146                 {
1147                         if (attrs.Count == 0)
1148                                 return null;
1149
1150                         foreach (var ca in attrs) {
1151                                 var dt = ca.Constructor.DeclaringType;
1152                                 if (dt.Name != "DecimalConstantAttribute" || dt.Namespace != CompilerServicesNamespace)
1153                                         continue;
1154
1155                                 var value = new decimal (
1156                                         (int) (uint) ca.ConstructorArguments[4].Value,
1157                                         (int) (uint) ca.ConstructorArguments[3].Value,
1158                                         (int) (uint) ca.ConstructorArguments[2].Value,
1159                                         (byte) ca.ConstructorArguments[1].Value != 0,
1160                                         (byte) ca.ConstructorArguments[0].Value);
1161
1162                                 return new DecimalConstant (module.Compiler.BuiltinTypes, value, Location.Null);
1163                         }
1164
1165                         return null;
1166                 }
1167
1168                 static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
1169                 {
1170                         Modifiers mod;
1171                         var ma = mb.Attributes;
1172                         switch (ma & MethodAttributes.MemberAccessMask) {
1173                         case MethodAttributes.Public:
1174                                 mod = Modifiers.PUBLIC;
1175                                 break;
1176                         case MethodAttributes.Assembly:
1177                                 mod = Modifiers.INTERNAL;
1178                                 break;
1179                         case MethodAttributes.Family:
1180                                 mod = Modifiers.PROTECTED;
1181                                 break;
1182                         case MethodAttributes.FamORAssem:
1183                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
1184                                 break;
1185                         default:
1186                                 mod = Modifiers.PRIVATE;
1187                                 break;
1188                         }
1189
1190                         if ((ma & MethodAttributes.Static) != 0) {
1191                                 mod |= Modifiers.STATIC;
1192                                 return mod;
1193                         }
1194                         if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
1195                                 mod |= Modifiers.ABSTRACT;
1196                                 return mod;
1197                         }
1198
1199                         // It can be sealed and override
1200                         if ((ma & MethodAttributes.Final) != 0)
1201                                 mod |= Modifiers.SEALED;
1202
1203                         if ((ma & MethodAttributes.Virtual) != 0) {
1204                                 // Not every member can be detected based on MethodAttribute, we
1205                                 // set virtual or non-virtual only when we are certain. Further checks
1206                                 // to really find out what `virtual' means for this member are done
1207                                 // later
1208                                 if ((ma & MethodAttributes.NewSlot) != 0) {
1209                                         if ((mod & Modifiers.SEALED) != 0) {
1210                                                 mod &= ~Modifiers.SEALED;
1211                                         } else {
1212                                                 mod |= Modifiers.VIRTUAL;
1213                                         }
1214                                 } else {
1215                                         mod |= Modifiers.OVERRIDE;
1216                                 }
1217                         }
1218
1219                         return mod;
1220                 }
1221         }
1222
1223         abstract class ImportedDefinition : IMemberDefinition
1224         {
1225                 protected class AttributesBag
1226                 {
1227                         public static readonly AttributesBag Default = new AttributesBag ();
1228
1229                         public AttributeUsageAttribute AttributeUsage;
1230                         public ObsoleteAttribute Obsolete;
1231                         public string[] Conditionals;
1232                         public string DefaultIndexerName;
1233                         public bool? CLSAttributeValue;
1234                         public TypeSpec CoClass;
1235
1236                         public static AttributesBag Read (MemberInfo mi, MetadataImporter importer)
1237                         {
1238                                 AttributesBag bag = null;
1239                                 List<string> conditionals = null;
1240
1241                                 // It should not throw any loading exception
1242                                 IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
1243
1244                                 foreach (var a in attrs) {
1245                                         var dt = a.Constructor.DeclaringType;
1246                                         string name = dt.Name;
1247                                         if (name == "ObsoleteAttribute") {
1248                                                 if (dt.Namespace != "System")
1249                                                         continue;
1250
1251                                                 if (bag == null)
1252                                                         bag = new AttributesBag ();
1253
1254                                                 var args = a.ConstructorArguments;
1255
1256                                                 if (args.Count == 1) {
1257                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
1258                                                 } else if (args.Count == 2) {
1259                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
1260                                                 } else {
1261                                                         bag.Obsolete = new ObsoleteAttribute ();
1262                                                 }
1263
1264                                                 continue;
1265                                         }
1266
1267                                         if (name == "ConditionalAttribute") {
1268                                                 if (dt.Namespace != "System.Diagnostics")
1269                                                         continue;
1270
1271                                                 if (bag == null)
1272                                                         bag = new AttributesBag ();
1273
1274                                                 if (conditionals == null)
1275                                                         conditionals = new List<string> (2);
1276
1277                                                 conditionals.Add ((string) a.ConstructorArguments[0].Value);
1278                                                 continue;
1279                                         }
1280
1281                                         if (name == "CLSCompliantAttribute") {
1282                                                 if (dt.Namespace != "System")
1283                                                         continue;
1284
1285                                                 if (bag == null)
1286                                                         bag = new AttributesBag ();
1287
1288                                                 bag.CLSAttributeValue = (bool) a.ConstructorArguments[0].Value;
1289                                                 continue;
1290                                         }
1291
1292                                         // Type only attributes
1293                                         if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
1294                                                 if (name == "DefaultMemberAttribute") {
1295                                                         if (dt.Namespace != "System.Reflection")
1296                                                                 continue;
1297
1298                                                         if (bag == null)
1299                                                                 bag = new AttributesBag ();
1300
1301                                                         bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
1302                                                         continue;
1303                                                 }
1304
1305                                                 if (name == "AttributeUsageAttribute") {
1306                                                         if (dt.Namespace != "System")
1307                                                                 continue;
1308
1309                                                         if (bag == null)
1310                                                                 bag = new AttributesBag ();
1311
1312                                                         bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
1313                                                         foreach (var named in a.NamedArguments) {
1314                                                                 if (named.MemberInfo.Name == "AllowMultiple")
1315                                                                         bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
1316                                                                 else if (named.MemberInfo.Name == "Inherited")
1317                                                                         bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
1318                                                         }
1319                                                         continue;
1320                                                 }
1321
1322                                                 // Interface only attribute
1323                                                 if (name == "CoClassAttribute") {
1324                                                         if (dt.Namespace != "System.Runtime.InteropServices")
1325                                                                 continue;
1326
1327                                                         if (bag == null)
1328                                                                 bag = new AttributesBag ();
1329
1330                                                         bag.CoClass = importer.ImportType ((MetaType) a.ConstructorArguments[0].Value);
1331                                                         continue;
1332                                                 }
1333                                         }
1334                                 }
1335
1336                                 if (bag == null)
1337                                         return Default;
1338
1339                                 if (conditionals != null)
1340                                         bag.Conditionals = conditionals.ToArray ();
1341
1342                                 return bag;
1343                         }
1344                 }
1345
1346                 protected readonly MemberInfo provider;
1347                 protected AttributesBag cattrs;
1348                 protected readonly MetadataImporter importer;
1349
1350                 public ImportedDefinition (MemberInfo provider, MetadataImporter importer)
1351                 {
1352                         this.provider = provider;
1353                         this.importer = importer;
1354                 }
1355
1356                 #region Properties
1357
1358                 public bool IsImported {
1359                         get {
1360                                 return true;
1361                         }
1362                 }
1363
1364                 public virtual string Name {
1365                         get {
1366                                 return provider.Name;
1367                         }
1368                 }
1369
1370                 #endregion
1371
1372                 public string[] ConditionalConditions ()
1373                 {
1374                         if (cattrs == null)
1375                                 ReadAttributes ();
1376
1377                         return cattrs.Conditionals;
1378                 }
1379
1380                 public ObsoleteAttribute GetAttributeObsolete ()
1381                 {
1382                         if (cattrs == null)
1383                                 ReadAttributes ();
1384
1385                         return cattrs.Obsolete;
1386                 }
1387
1388                 public bool? CLSAttributeValue {
1389                         get {
1390                                 if (cattrs == null)
1391                                         ReadAttributes ();
1392
1393                                 return cattrs.CLSAttributeValue;
1394                         }
1395                 }
1396
1397                 protected void ReadAttributes ()
1398                 {
1399                         cattrs = AttributesBag.Read (provider, importer);
1400                 }
1401
1402                 public void SetIsAssigned ()
1403                 {
1404                         // Unused for imported members
1405                 }
1406
1407                 public void SetIsUsed ()
1408                 {
1409                         // Unused for imported members
1410                 }
1411         }
1412
1413         public class ImportedModuleDefinition
1414         {
1415                 readonly Module module;
1416                 bool cls_compliant;
1417
1418                 public ImportedModuleDefinition (Module module)
1419                 {
1420                         this.module = module;
1421                 }
1422
1423                 #region Properties
1424
1425                 public bool IsCLSCompliant {
1426                         get {
1427                                 return cls_compliant;
1428                         }
1429                 }
1430
1431                 public string Name {
1432                         get {
1433                                 return module.Name;
1434                         }
1435                 }
1436
1437                 #endregion
1438
1439                 public void ReadAttributes ()
1440                 {
1441                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
1442
1443                         foreach (var a in attrs) {
1444                                 var dt = a.Constructor.DeclaringType;
1445                                 if (dt.Name == "CLSCompliantAttribute") {
1446                                         if (dt.Namespace != "System")
1447                                                 continue;
1448
1449                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1450                                         continue;
1451                                 }
1452                         }
1453                 }
1454
1455                 //
1456                 // Reads assembly attributes which where attached to a special type because
1457                 // module does have assembly manifest
1458                 //
1459                 public List<Attribute> ReadAssemblyAttributes ()
1460                 {
1461                         var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
1462                         if (t == null)
1463                                 return null;
1464
1465                         var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
1466                         if (field == null)
1467                                 return null;
1468
1469                         // TODO: implement, the idea is to fabricate specil Attribute class and
1470                         // add it to OptAttributes before resolving the source code attributes
1471                         // Need to build module location as well for correct error reporting
1472
1473                         //var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
1474                         //var attrs = new List<Attribute> (assembly_attributes.Count);
1475                         //foreach (var a in assembly_attributes)
1476                         //{
1477                         //    var type = metaImporter.ImportType (a.Constructor.DeclaringType);
1478                         //    var ctor = metaImporter.CreateMethod (a.Constructor, type);
1479
1480                         //    foreach (var carg in a.ConstructorArguments) {
1481                         //        carg.Value
1482                         //    }
1483
1484                         //    attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
1485                         //}
1486
1487                         return null;
1488                 }
1489         }
1490
1491         public class ImportedAssemblyDefinition : IAssemblyDefinition
1492         {
1493                 readonly Assembly assembly;
1494                 readonly AssemblyName aname;
1495                 bool cls_compliant;
1496                 bool contains_extension_methods;
1497
1498                 List<AssemblyName> internals_visible_to;
1499                 Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
1500
1501                 public ImportedAssemblyDefinition (Assembly assembly)
1502                 {
1503                         this.assembly = assembly;
1504                         this.aname = assembly.GetName ();
1505                 }
1506
1507                 #region Properties
1508
1509                 public Assembly Assembly {
1510                         get {
1511                                 return assembly;
1512                         }
1513                 }
1514
1515                 public string FullName {
1516                         get {
1517                                 return aname.FullName;
1518                         }
1519                 }
1520
1521                 public bool HasExtensionMethod {
1522                         get {
1523                                 return contains_extension_methods;
1524                         }
1525                 }
1526
1527                 public bool HasStrongName {
1528                         get {
1529                                 return aname.GetPublicKey ().Length != 0;
1530                         }
1531                 }
1532
1533                 public bool IsMissing {
1534                         get {
1535 #if STATIC
1536                                 return assembly.__IsMissing;
1537 #else
1538                                 return false;
1539 #endif
1540                         }
1541                 }
1542
1543                 public bool IsCLSCompliant {
1544                         get {
1545                                 return cls_compliant;
1546                         }
1547                 }
1548
1549                 public string Location {
1550                         get {
1551                                 return assembly.Location;
1552                         }
1553                 }
1554
1555                 public string Name {
1556                         get {
1557                                 return aname.Name;
1558                         }
1559                 }
1560
1561                 #endregion
1562
1563                 public byte[] GetPublicKeyToken ()
1564                 {
1565                         return aname.GetPublicKeyToken ();
1566                 }
1567
1568                 public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
1569                 {
1570                         return internals_visible_to_cache [assembly];
1571                 }
1572
1573                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1574                 {
1575                         if (internals_visible_to == null)
1576                                 return false;
1577
1578                         AssemblyName is_visible = null;
1579                         if (internals_visible_to_cache == null) {
1580                                 internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
1581                         } else {
1582                                 if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
1583                                         return is_visible != null;
1584                         }
1585
1586                         var token = assembly.GetPublicKeyToken ();
1587                         if (token != null && token.Length == 0)
1588                                 token = null;
1589
1590                         foreach (var internals in internals_visible_to) {
1591                                 if (internals.Name != assembly.Name)
1592                                         continue;
1593
1594                                 if (token == null && assembly is AssemblyDefinition) {
1595                                         is_visible = internals;
1596                                         break;
1597                                 }
1598
1599                                 if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
1600                                         continue;
1601
1602                                 is_visible = internals;
1603                                 break;
1604                         }
1605
1606                         internals_visible_to_cache.Add (assembly, is_visible);
1607                         return is_visible != null;
1608                 }
1609
1610                 public void ReadAttributes ()
1611                 {
1612 #if STATIC
1613                         if (assembly.__IsMissing)
1614                                 return;
1615 #endif
1616
1617                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
1618
1619                         foreach (var a in attrs) {
1620                                 var dt = a.Constructor.DeclaringType;
1621                                 var name = dt.Name;
1622                                 if (name == "CLSCompliantAttribute") {
1623                                         if (dt.Namespace == "System") {
1624                                                 cls_compliant = (bool) a.ConstructorArguments[0].Value;
1625                                         }
1626                                         continue;
1627                                 }
1628
1629                                 if (name == "InternalsVisibleToAttribute") {
1630                                         if (dt.Namespace != MetadataImporter.CompilerServicesNamespace)
1631                                                 continue;
1632
1633                                         string s = a.ConstructorArguments[0].Value as string;
1634                                         if (s == null)
1635                                                 continue;
1636
1637                                         var an = new AssemblyName (s);
1638                                         if (internals_visible_to == null)
1639                                                 internals_visible_to = new List<AssemblyName> ();
1640
1641                                         internals_visible_to.Add (an);
1642                                         continue;
1643                                 }
1644
1645                                 if (name == "ExtensionAttribute") {
1646                                         if (dt.Namespace == MetadataImporter.CompilerServicesNamespace)
1647                                                 contains_extension_methods = true;
1648
1649                                         continue;
1650                                 }
1651                         }
1652                 }
1653
1654                 public override string ToString ()
1655                 {
1656                         return FullName;
1657                 }
1658         }
1659
1660         class ImportedMemberDefinition : ImportedDefinition
1661         {
1662                 readonly TypeSpec type;
1663
1664                 public ImportedMemberDefinition (MemberInfo member, TypeSpec type, MetadataImporter importer)
1665                         : base (member, importer)
1666                 {
1667                         this.type = type;
1668                 }
1669
1670                 #region Properties
1671
1672                 public TypeSpec MemberType {
1673                         get {
1674                                 return type;
1675                         }
1676                 }
1677
1678                 #endregion
1679         }
1680
1681         class ImportedParameterMemberDefinition : ImportedMemberDefinition, IParametersMember
1682         {
1683                 readonly AParametersCollection parameters;
1684
1685                 public ImportedParameterMemberDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1686                         : base (provider, type, importer)
1687                 {
1688                         this.parameters = parameters;
1689                 }
1690
1691                 public ImportedParameterMemberDefinition (PropertyInfo provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1692                         : base (provider, type, importer)
1693                 {
1694                         this.parameters = parameters;
1695                 }
1696
1697                 #region Properties
1698
1699                 public AParametersCollection Parameters {
1700                         get {
1701                                 return parameters;
1702                         }
1703                 }
1704
1705                 #endregion
1706         }
1707
1708         class ImportedGenericMethodDefinition : ImportedParameterMemberDefinition, IGenericMethodDefinition
1709         {
1710                 readonly TypeParameterSpec[] tparams;
1711
1712                 public ImportedGenericMethodDefinition (MethodInfo provider, TypeSpec type, AParametersCollection parameters, TypeParameterSpec[] tparams, MetadataImporter importer)
1713                         : base (provider, type, parameters, importer)
1714                 {
1715                         this.tparams = tparams;
1716                 }
1717
1718                 #region Properties
1719
1720                 public TypeParameterSpec[] TypeParameters {
1721                         get {
1722                                 return tparams;
1723                         }
1724                 }
1725
1726                 public int TypeParametersCount {
1727                         get {
1728                                 return tparams.Length;
1729                         }
1730                 }
1731
1732                 #endregion
1733         }
1734
1735         class ImportedTypeDefinition : ImportedDefinition, ITypeDefinition
1736         {
1737                 TypeParameterSpec[] tparams;
1738                 string name;
1739
1740                 public ImportedTypeDefinition (MetaType type, MetadataImporter importer)
1741                         : base (type, importer)
1742                 {
1743                 }
1744
1745                 #region Properties
1746
1747                 public IAssemblyDefinition DeclaringAssembly {
1748                         get {
1749                                 return importer.GetAssemblyDefinition (provider.Module.Assembly);
1750                         }
1751                 }
1752
1753                 bool ITypeDefinition.IsPartial {
1754                         get {
1755                                 return false;
1756                         }
1757                 }
1758
1759                 public override string Name {
1760                         get {
1761                                 if (name == null) {
1762                                         name = base.Name;
1763                                         if (tparams != null) {
1764                                                 int arity_start = name.IndexOf ('`');
1765                                                 if (arity_start > 0)
1766                                                         name = name.Substring (0, arity_start);
1767                                         }
1768                                 }
1769
1770                                 return name;
1771                         }
1772                 }
1773
1774                 public string Namespace {
1775                         get {
1776                                 return ((MetaType) provider).Namespace;
1777                         }
1778                 }
1779
1780                 public int TypeParametersCount {
1781                         get {
1782                                 return tparams == null ? 0 : tparams.Length;
1783                         }
1784                 }
1785
1786                 public TypeParameterSpec[] TypeParameters {
1787                         get {
1788                                 return tparams;
1789                         }
1790                         set {
1791                                 tparams = value;
1792                         }
1793                 }
1794
1795                 #endregion
1796
1797                 public static void Error_MissingDependency (IMemberContext ctx, List<TypeSpec> types, Location loc)
1798                 {
1799                         //
1800                         // Report details about missing type and most likely cause of the problem.
1801                         // csc reports 1683, 1684 as warnings but we report them only when used
1802                         // or referenced from the user core in which case compilation error has to
1803                         // be reported because compiler cannot continue anyway
1804                         //
1805                         foreach (var t in types) {
1806                                 string name = t.GetSignatureForError ();
1807
1808                                 if (t.MemberDefinition.DeclaringAssembly == ctx.Module.DeclaringAssembly) {
1809                                         ctx.Module.Compiler.Report.Error (1683, loc,
1810                                                 "Reference to type `{0}' claims it is defined in this assembly, but it is not defined in source or any added modules",
1811                                                 name);
1812                                 } else if (t.MemberDefinition.DeclaringAssembly.IsMissing) {
1813                                         ctx.Module.Compiler.Report.Error (12, loc,
1814                                                 "The type `{0}' is defined in an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
1815                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
1816                                 } else {
1817                                         ctx.Module.Compiler.Report.Error (1684, loc,
1818                                                 "Reference to type `{0}' claims it is defined assembly `{1}', but it could not be found",
1819                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
1820                                 }
1821                         }
1822                 }
1823
1824                 public TypeSpec GetAttributeCoClass ()
1825                 {
1826                         if (cattrs == null)
1827                                 ReadAttributes ();
1828
1829                         return cattrs.CoClass;
1830                 }
1831
1832                 public string GetAttributeDefaultMember ()
1833                 {
1834                         if (cattrs == null)
1835                                 ReadAttributes ();
1836
1837                         return cattrs.DefaultIndexerName;
1838                 }
1839
1840                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
1841                 {
1842                         if (cattrs == null)
1843                                 ReadAttributes ();
1844
1845                         return cattrs.AttributeUsage;
1846                 }
1847
1848                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
1849                 {
1850                         var a = importer.GetAssemblyDefinition (provider.Module.Assembly);
1851                         return a == assembly || a.IsFriendAssemblyTo (assembly);
1852                 }
1853
1854                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
1855                 {
1856                         //
1857                         // Not interested in members of nested private types unless the importer needs them
1858                         //
1859                         if (declaringType.IsPrivate && importer.IgnorePrivateMembers) {
1860                                 cache = MemberCache.Empty;
1861                                 return;
1862                         }
1863
1864                         var loading_type = (MetaType) provider;
1865                         const BindingFlags all_members = BindingFlags.DeclaredOnly |
1866                                 BindingFlags.Static | BindingFlags.Instance |
1867                                 BindingFlags.Public | BindingFlags.NonPublic;
1868
1869                         const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
1870                                         MethodAttributes.Virtual | MethodAttributes.HideBySig |
1871                                         MethodAttributes.Final;
1872
1873                         Dictionary<MethodBase, MethodSpec> possible_accessors = null;
1874                         List<EventSpec> imported_events = null;
1875                         EventSpec event_spec;
1876                         MemberSpec imported;
1877                         MethodInfo m;
1878                         MemberInfo[] all;
1879                         try {
1880                                 all = loading_type.GetMembers (all_members);
1881                         } catch (Exception e) {
1882                                 throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
1883                                         declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
1884                         }
1885
1886                         if (cache == null) {
1887                                 cache = new MemberCache (all.Length);
1888
1889                                 //
1890                                 // Do the types first as they can be referenced by the members before
1891                                 // they are found or inflated
1892                                 //
1893                                 foreach (var member in all) {
1894                                         if (member.MemberType != MemberTypes.NestedType)
1895                                                 continue;
1896
1897                                         var t = (MetaType) member;
1898
1899                                         // Ignore compiler generated types, mostly lambda containers
1900                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
1901                                                 continue;
1902
1903                                         try {
1904                                                 imported = importer.CreateNestedType (t, declaringType);
1905                                         } catch (Exception e) {
1906                                                 throw new InternalErrorException (e, "Could not import nested type `{0}' from `{1}'",
1907                                                         t.FullName, declaringType.MemberDefinition.DeclaringAssembly.FullName);
1908                                         }
1909
1910                                         cache.AddMemberImported (imported);
1911                                 }
1912
1913                                 foreach (var member in all) {
1914                                         if (member.MemberType != MemberTypes.NestedType)
1915                                                 continue;
1916
1917                                         var t = (MetaType) member;
1918
1919                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
1920                                                 continue;
1921
1922                                         importer.ImportTypeBase (t);
1923                                 }
1924                         }
1925
1926                         //
1927                         // Load base interfaces first to minic behaviour of compiled members
1928                         //
1929                         if (declaringType.IsInterface && declaringType.Interfaces != null) {
1930                                 foreach (var iface in declaringType.Interfaces) {
1931                                         cache.AddInterface (iface);
1932                                 }
1933                         }
1934
1935                         if (!onlyTypes) {
1936                                 //
1937                                 // The logic here requires methods to be returned first which seems to work for both Mono and .NET
1938                                 //
1939                                 foreach (var member in all) {
1940                                         switch (member.MemberType) {
1941                                         case MemberTypes.Constructor:
1942                                         case MemberTypes.Method:
1943                                                 MethodBase mb = (MethodBase) member;
1944                                                 var attrs = mb.Attributes;
1945
1946                                                 if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
1947                                                         if (importer.IgnorePrivateMembers)
1948                                                                 continue;
1949
1950                                                         // Ignore explicitly implemented members
1951                                                         if ((attrs & explicit_impl) == explicit_impl)
1952                                                                 continue;
1953
1954                                                         // Ignore compiler generated methods
1955                                                         if (MetadataImporter.HasAttribute (CustomAttributeData.GetCustomAttributes (mb), "CompilerGeneratedAttribute", MetadataImporter.CompilerServicesNamespace))
1956                                                                 continue;
1957                                                 }
1958
1959                                                 imported = importer.CreateMethod (mb, declaringType);
1960                                                 if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
1961                                                         if (possible_accessors == null)
1962                                                                 possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
1963
1964                                                         // There are no metadata rules for accessors, we have to consider any method as possible candidate
1965                                                         possible_accessors.Add (mb, (MethodSpec) imported);
1966                                                 }
1967
1968                                                 break;
1969                                         case MemberTypes.Property:
1970                                                 if (possible_accessors == null)
1971                                                         continue;
1972
1973                                                 var p = (PropertyInfo) member;
1974                                                 //
1975                                                 // Links possible accessors with property
1976                                                 //
1977                                                 MethodSpec get, set;
1978                                                 m = p.GetGetMethod (true);
1979                                                 if (m == null || !possible_accessors.TryGetValue (m, out get))
1980                                                         get = null;
1981
1982                                                 m = p.GetSetMethod (true);
1983                                                 if (m == null || !possible_accessors.TryGetValue (m, out set))
1984                                                         set = null;
1985
1986                                                 // No accessors registered (e.g. explicit implementation)
1987                                                 if (get == null && set == null)
1988                                                         continue;
1989
1990                                                 imported = importer.CreateProperty (p, declaringType, get, set);
1991                                                 if (imported == null)
1992                                                         continue;
1993
1994                                                 break;
1995                                         case MemberTypes.Event:
1996                                                 if (possible_accessors == null)
1997                                                         continue;
1998
1999                                                 var e = (EventInfo) member;
2000                                                 //
2001                                                 // Links accessors with event
2002                                                 //
2003                                                 MethodSpec add, remove;
2004                                                 m = e.GetAddMethod (true);
2005                                                 if (m == null || !possible_accessors.TryGetValue (m, out add))
2006                                                         add = null;
2007
2008                                                 m = e.GetRemoveMethod (true);
2009                                                 if (m == null || !possible_accessors.TryGetValue (m, out remove))
2010                                                         remove = null;
2011
2012                                                 // Both accessors are required
2013                                                 if (add == null || remove == null)
2014                                                         continue;
2015
2016                                                 event_spec = importer.CreateEvent (e, declaringType, add, remove);
2017                                                 if (!importer.IgnorePrivateMembers) {
2018                                                         if (imported_events == null)
2019                                                                 imported_events = new List<EventSpec> ();
2020
2021                                                         imported_events.Add (event_spec);
2022                                                 }
2023
2024                                                 imported = event_spec;
2025                                                 break;
2026                                         case MemberTypes.Field:
2027                                                 var fi = (FieldInfo) member;
2028
2029                                                 imported = importer.CreateField (fi, declaringType);
2030                                                 if (imported == null)
2031                                                         continue;
2032
2033                                                 //
2034                                                 // For dynamic binder event has to be fully restored to allow operations
2035                                                 // within the type container to work correctly
2036                                                 //
2037                                                 if (imported_events != null) {
2038                                                         // The backing event field should be private but it may not
2039                                                         int i;
2040                                                         for (i = 0; i < imported_events.Count; ++i) {
2041                                                                 var ev = imported_events[i];
2042                                                                 if (ev.Name == fi.Name) {
2043                                                                         ev.BackingField = (FieldSpec) imported;
2044                                                                         imported_events.RemoveAt (i);
2045                                                                         i = -1;
2046                                                                         break;
2047                                                                 }
2048                                                         }
2049
2050                                                         if (i < 0)
2051                                                                 continue;
2052                                                 }
2053
2054                                                 break;
2055                                         case MemberTypes.NestedType:
2056                                                 // Already in the cache from the first pass
2057                                                 continue;
2058                                         default:
2059                                                 throw new NotImplementedException (member.ToString ());
2060                                         }
2061
2062                                         cache.AddMemberImported (imported);
2063                                 }
2064                         }
2065                 }
2066         }
2067
2068         class ImportedTypeParameterDefinition : ImportedDefinition, ITypeDefinition
2069         {
2070                 public ImportedTypeParameterDefinition (MetaType type, MetadataImporter importer)
2071                         : base (type, importer)
2072                 {
2073                 }
2074
2075                 #region Properties
2076
2077                 public IAssemblyDefinition DeclaringAssembly {
2078                         get {
2079                                 throw new NotImplementedException ();
2080                         }
2081                 }
2082
2083                 bool ITypeDefinition.IsPartial {
2084                         get {
2085                                 return false;
2086                         }
2087                 }
2088
2089                 public string Namespace {
2090                         get {
2091                                 return null;
2092                         }
2093                 }
2094
2095                 public int TypeParametersCount {
2096                         get {
2097                                 return 0;
2098                         }
2099                 }
2100
2101                 public TypeParameterSpec[] TypeParameters {
2102                         get {
2103                                 return null;
2104                         }
2105                 }
2106
2107                 #endregion
2108
2109                 public TypeSpec GetAttributeCoClass ()
2110                 {
2111                         return null;
2112                 }
2113
2114                 public string GetAttributeDefaultMember ()
2115                 {
2116                         throw new NotSupportedException ();
2117                 }
2118
2119                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2120                 {
2121                         throw new NotSupportedException ();
2122                 }
2123
2124                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2125                 {
2126                         throw new NotImplementedException ();
2127                 }
2128
2129                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2130                 {
2131                         throw new NotImplementedException ();
2132                 }
2133         }
2134 }