mcs/mcs/import.cs

   1 //
   2 // import.cs: System.Reflection conversions
   3 //
   4 // Authors: Marek Safar (marek.safar@gmail.com)
   5 //
   6 // Dual licensed under the terms of the MIT X11 or GNU GPL
   7 //
   8 // Copyright 2009, 2010 Novell, Inc
   9 //
  10
  11 using System;
  12 using System.Runtime.CompilerServices;
  13 using System.Linq;
  14 using System.Collections.Generic;
  15
  16 #if STATIC
  17 using MetaType = IKVM.Reflection.Type;
  18 using IKVM.Reflection;
  19 using IKVM.Reflection.Emit;
  20 #else
  21 using MetaType = System.Type;
  22 using System.Reflection;
  23 using System.Reflection.Emit;
  24 #endif
  25
  26 namespace Mono.CSharp
  27 {
  28         public abstract class MetadataImporter
  29         {
  30                 //
  31                 // Dynamic types reader with additional logic to reconstruct a dynamic
  32                 // type using DynamicAttribute values
  33                 //
  34                 struct DynamicTypeReader
  35                 {
  36                         static readonly bool[] single_attribute = { true };
  37
  38                         public int Position;
  39                         bool[] flags;
  40
  41                         // There is no common type for CustomAttributeData and we cannot
  42                         // use ICustomAttributeProvider
  43                         object provider;
  44
  45                         //
  46                         // A member provider which can be used to get CustomAttributeData
  47                         //
  48                         public DynamicTypeReader (object provider)
  49                         {
  50                                 Position = 0;
  51                                 flags = null;
  52                                 this.provider = provider;
  53                         }
  54
  55                         //
  56                         // Returns true when object at local position has dynamic attribute flag
  57                         //
  58                         public bool IsDynamicObject (MetadataImporter importer)
  59                         {
  60                                 if (provider != null)
  61                                         ReadAttribute (importer);
  62
  63                                 return flags != null && Position < flags.Length && flags[Position];
  64                         }
  65
  66                         //
  67                         // Returns true when DynamicAttribute exists
  68                         //
  69                         public bool HasDynamicAttribute (MetadataImporter importer)
  70                         {
  71                                 if (provider != null)
  72                                         ReadAttribute (importer);
  73
  74                                 return flags != null;
  75                         }
  76
  77                         void ReadAttribute (MetadataImporter importer)
  78                         {
  79                                 IList<CustomAttributeData> cad;
  80                                 if (provider is MemberInfo) {
  81                                         cad = CustomAttributeData.GetCustomAttributes ((MemberInfo) provider);
  82                                 } else if (provider is ParameterInfo) {
  83                                         cad = CustomAttributeData.GetCustomAttributes ((ParameterInfo) provider);
  84                                 } else {
  85                                         provider = null;
  86                                         return;
  87                                 }
  88
  89                                 if (cad.Count > 0) {
  90                                         string ns, name;
  91                                         foreach (var ca in cad) {
  92                                                 importer.GetCustomAttributeTypeName (ca, out ns, out name);
  93                                                 if (name != "DynamicAttribute" && ns != CompilerServicesNamespace)
  94                                                         continue;
  95
  96                                                 if (ca.ConstructorArguments.Count == 0) {
  97                                                         flags = single_attribute;
  98                                                         break;
  99                                                 }
 100
 101                                                 var arg_type = ca.ConstructorArguments[0].ArgumentType;
 102
 103                                                 if (arg_type.IsArray && MetaType.GetTypeCode (arg_type.GetElementType ()) == TypeCode.Boolean) {
 104                                                         var carg = (IList<CustomAttributeTypedArgument>) ca.ConstructorArguments[0].Value;
 105                                                         flags = new bool[carg.Count];
 106                                                         for (int i = 0; i < flags.Length; ++i) {
 107                                                                 if (MetaType.GetTypeCode (carg[i].ArgumentType) == TypeCode.Boolean)
 108                                                                         flags[i] = (bool) carg[i].Value;
 109                                                         }
 110
 111                                                         break;
 112                                                 }
 113                                         }
 114                                 }
 115
 116                                 provider = null;
 117                         }
 118                 }
 119
 120                 protected readonly Dictionary<MetaType, TypeSpec> import_cache;
 121                 protected readonly Dictionary<MetaType, TypeSpec> compiled_types;
 122                 protected readonly Dictionary<Assembly, IAssemblyDefinition> assembly_2_definition;
 123                 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                 public abstract void GetCustomAttributeTypeName (CustomAttributeData cad, out string typeNamespace, out string typeName);
 153
 154                 public FieldSpec CreateField (FieldInfo fi, TypeSpec declaringType)
 155                 {
 156                         Modifiers mod = 0;
 157                         var fa = fi.Attributes;
 158                         switch (fa & FieldAttributes.FieldAccessMask) {
 159                                 case FieldAttributes.Public:
 160                                         mod = Modifiers.PUBLIC;
 161                                         break;
 162                                 case FieldAttributes.Assembly:
 163                                         mod = Modifiers.INTERNAL;
 164                                         break;
 165                                 case FieldAttributes.Family:
 166                                         mod = Modifiers.PROTECTED;
 167                                         break;
 168                                 case FieldAttributes.FamORAssem:
 169                                         mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 170                                         break;
 171                                 default:
 172                                         // Ignore private fields (even for error reporting) to not require extra dependencies
 173                                         if (IgnorePrivateMembers || 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.BuildinType == BuildinTypeSpec.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.BuildinTypes.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.BuildinType == BuildinTypeSpec.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 && kind == MemberKind.Method && declaringType.BaseType != null) {
 391                                         var filter = MemberFilter.Method (name, tparams != null ? tparams.Length : 0, parameters, null);
 392                                         var candidate = MemberCache.FindMember (declaringType.BaseType, filter, BindingRestriction.None);
 393
 394                                         //
 395                                         // For imported class method do additional validation to be sure that metadata
 396                                         // override flag was correct
 397                                         //
 398                                         // Difference between protected internal and protected is ok
 399                                         //
 400                                         const Modifiers conflict_mask = Modifiers.AccessibilityMask & ~Modifiers.INTERNAL;
 401                                         if (candidate == null || (candidate.Modifiers & conflict_mask) != (mod & conflict_mask) || candidate.IsStatic) {
 402                                                 mod &= ~Modifiers.OVERRIDE;
 403                                                 mod |= Modifiers.VIRTUAL;
 404                                         }
 405                                 }
 406                         }
 407
 408                         IMemberDefinition definition;
 409                         if (tparams != null) {
 410                                 var gmd = new ImportedGenericMethodDefinition ((MethodInfo) mb, returnType, parameters, tparams, this);
 411                                 foreach (var tp in gmd.TypeParameters) {
 412                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
 413                                 }
 414
 415                                 definition = gmd;
 416                         } else {
 417                                 definition = new ImportedParameterMemberDefinition (mb, returnType, parameters, this);
 418                         }
 419
 420                         MethodSpec ms = new MethodSpec (kind, declaringType, definition, returnType, mb, parameters, mod);
 421                         if (tparams != null)
 422                                 ms.IsGeneric = true;
 423
 424                         return ms;
 425                 }
 426
 427                 //
 428                 // Imports System.Reflection parameters
 429                 //
 430                 AParametersCollection CreateParameters (TypeSpec parent, ParameterInfo[] pi, MethodBase method)
 431                 {
 432                         int varargs = method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0 ? 1 : 0;
 433
 434                         if (pi.Length == 0 && varargs == 0)
 435                                 return ParametersCompiled.EmptyReadOnlyParameters;
 436
 437                         TypeSpec[] types = new TypeSpec[pi.Length + varargs];
 438                         IParameterData[] par = new IParameterData[pi.Length + varargs];
 439                         bool is_params = false;
 440                         for (int i = 0; i < pi.Length; i++) {
 441                                 ParameterInfo p = pi[i];
 442                                 Parameter.Modifier mod = 0;
 443                                 Expression default_value = null;
 444                                 if (p.ParameterType.IsByRef) {
 445                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 446                                                 mod = Parameter.Modifier.OUT;
 447                                         else
 448                                                 mod = Parameter.Modifier.REF;
 449
 450                                         //
 451                                         // Strip reference wrapping
 452                                         //
 453                                         var el = p.ParameterType.GetElementType ();
 454                                         types[i] = ImportType (el, new DynamicTypeReader (p));  // TODO: 1-based positio to be csc compatible
 455                                 } else if (i == 0 && method.IsStatic && parent.IsStatic && parent.MemberDefinition.DeclaringAssembly.HasExtensionMethod &&
 456                                         HasAttribute (CustomAttributeData.GetCustomAttributes (method), "ExtensionAttribute", CompilerServicesNamespace)) {
 457                                         mod = Parameter.Modifier.This;
 458                                         types[i] = ImportType (p.ParameterType);
 459                                 } else {
 460                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 461
 462                                         if (i >= pi.Length - 2 && types[i] is ArrayContainer) {
 463                                                 if (HasAttribute (CustomAttributeData.GetCustomAttributes (p), "ParamArrayAttribute", "System")) {
 464                                                         mod = Parameter.Modifier.PARAMS;
 465                                                         is_params = true;
 466                                                 }
 467                                         }
 468
 469                                         if (!is_params && p.IsOptional) {
 470                                                 object value = p.RawDefaultValue;
 471                                                 var ptype = types[i];
 472                                                 if ((p.Attributes & ParameterAttributes.HasDefault) != 0 && ptype.Kind != MemberKind.TypeParameter && (value != null || TypeManager.IsReferenceType (ptype))) {
 473                                                         if (value == null) {
 474                                                                 default_value = Constant.CreateConstant (ptype, null, Location.Null);
 475                                                         } else {
 476                                                                 default_value = ImportParameterConstant (value);
 477
 478                                                                 if (ptype.IsEnum) {
 479                                                                         default_value = new EnumConstant ((Constant) default_value, ptype);
 480                                                                 }
 481                                                         }
 482                                                 } else if (value == Missing.Value) {
 483                                                         default_value = EmptyExpression.MissingValue;
 484                                                 } else if (value == null) {
 485                                                         default_value = new DefaultValueExpression (new TypeExpression (ptype, Location.Null), Location.Null);
 486                                                 } else if (ptype.BuildinType == BuildinTypeSpec.Type.Decimal) {
 487                                                         default_value = ImportParameterConstant (value);
 488                                                 }
 489                                         }
 490                                 }
 491
 492                                 par[i] = new ParameterData (p.Name, mod, default_value);
 493                         }
 494
 495                         if (varargs != 0) {
 496                                 par[par.Length - 1] = new ArglistParameter (Location.Null);
 497                                 types[types.Length - 1] = InternalType.Arglist;
 498                         }
 499
 500                         return method != null ?
 501                                 new ParametersImported (par, types, varargs != 0, is_params) :
 502                                 new ParametersImported (par, types, is_params);
 503                 }
 504
 505                 //
 506                 // Returns null when the property is not valid C# property
 507                 //
 508                 public PropertySpec CreateProperty (PropertyInfo pi, TypeSpec declaringType, MethodSpec get, MethodSpec set)
 509                 {
 510                         Modifiers mod = 0;
 511                         AParametersCollection param = null;
 512                         TypeSpec type = null;
 513                         if (get != null) {
 514                                 mod = get.Modifiers;
 515                                 param = get.Parameters;
 516                                 type = get.ReturnType;
 517                         }
 518
 519                         bool is_valid_property = true;
 520                         if (set != null) {
 521                                 if (set.ReturnType.Kind != MemberKind.Void)
 522                                         is_valid_property = false;
 523
 524                                 var set_param_count = set.Parameters.Count - 1;
 525
 526                                 if (set_param_count < 0) {
 527                                         set_param_count = 0;
 528                                         is_valid_property = false;
 529                                 }
 530
 531                                 var set_type = set.Parameters.Types[set_param_count];
 532
 533                                 if (mod == 0) {
 534                                         AParametersCollection set_based_param;
 535
 536                                         if (set_param_count == 0) {
 537                                                 set_based_param = ParametersCompiled.EmptyReadOnlyParameters;
 538                                         } else {
 539                                                 //
 540                                                 // Create indexer parameters based on setter method parameters (the last parameter has to be removed)
 541                                                 //
 542                                                 var data = new IParameterData[set_param_count];
 543                                                 var types = new TypeSpec[set_param_count];
 544                                                 Array.Copy (set.Parameters.FixedParameters, data, set_param_count);
 545                                                 Array.Copy (set.Parameters.Types, types, set_param_count);
 546                                                 set_based_param = new ParametersImported (data, types, set.Parameters.HasParams);
 547                                         }
 548
 549                                         mod = set.Modifiers;
 550                                         param = set_based_param;
 551                                         type = set_type;
 552                                 } else {
 553                                         if (set_param_count != get.Parameters.Count)
 554                                                 is_valid_property = false;
 555
 556                                         if (get.ReturnType != set_type)
 557                                                 is_valid_property = false;
 558
 559                                         // Possible custom accessor modifiers
 560                                         if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
 561                                                 var get_acc = mod & Modifiers.AccessibilityMask;
 562                                                 if (get_acc != Modifiers.PUBLIC) {
 563                                                         var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
 564                                                         // If the accessor modifiers are not same, do extra restriction checks
 565                                                         if (get_acc != set_acc) {
 566                                                                 var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
 567                                                                 var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
 568                                                                 if (get_restr && set_restr) {
 569                                                                         is_valid_property = false; // Neither is more restrictive
 570                                                                 }
 571
 572                                                                 if (get_restr) {
 573                                                                         mod &= ~Modifiers.AccessibilityMask;
 574                                                                         mod |= set_acc;
 575                                                                 }
 576                                                         }
 577                                                 }
 578                                         }
 579                                 }
 580                         }
 581
 582                         PropertySpec spec = null;
 583                         if (!param.IsEmpty) {
 584                                 var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
 585                                 if (index_name == null) {
 586                                         is_valid_property = false;
 587                                 } else {
 588                                         if (get != null) {
 589                                                 if (get.IsStatic)
 590                                                         is_valid_property = false;
 591                                                 if (get.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 592                                                         is_valid_property = false;
 593                                         }
 594                                         if (set != null) {
 595                                                 if (set.IsStatic)
 596                                                         is_valid_property = false;
 597                                                 if (set.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 598                                                         is_valid_property = false;
 599                                         }
 600                                 }
 601
 602                                 if (is_valid_property)
 603                                         spec = new IndexerSpec (declaringType, new ImportedParameterMemberDefinition (pi, type, param, this), type, param, pi, mod);
 604                         }
 605
 606                         if (spec == null)
 607                                 spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi, type, this), type, pi, mod);
 608
 609                         if (!is_valid_property) {
 610                                 spec.IsNotRealProperty = true;
 611                                 return spec;
 612                         }
 613
 614                         if (set != null)
 615                                 spec.Set = set;
 616                         if (get != null)
 617                                 spec.Get = get;
 618
 619                         return spec;
 620                 }
 621
 622                 public TypeSpec CreateType (MetaType type)
 623                 {
 624                         return CreateType (type, new DynamicTypeReader (), true);
 625                 }
 626
 627                 public TypeSpec CreateNestedType (MetaType type, TypeSpec declaringType)
 628                 {
 629                         return CreateType (type, declaringType, new DynamicTypeReader (type), false);
 630                 }
 631
 632                 TypeSpec CreateType (MetaType type, DynamicTypeReader dtype, bool canImportBaseType)
 633                 {
 634                         TypeSpec declaring_type;
 635                         if (type.IsNested && !type.IsGenericParameter)
 636                                 declaring_type = CreateType (type.DeclaringType, new DynamicTypeReader (type.DeclaringType), true);
 637                         else
 638                                 declaring_type = null;
 639
 640                         return CreateType (type, declaring_type, dtype, canImportBaseType);
 641                 }
 642
 643                 TypeSpec CreateType (MetaType type, TypeSpec declaringType, DynamicTypeReader dtype, bool canImportBaseType)
 644                 {
 645                         TypeSpec spec;
 646                         if (import_cache.TryGetValue (type, out spec)) {
 647                                 if (spec.BuildinType == BuildinTypeSpec.Type.Object) {
 648                                         if (dtype.IsDynamicObject (this))
 649                                                 return module.Compiler.BuildinTypes.Dynamic;
 650
 651                                         return spec;
 652                                 }
 653
 654                                 if (!spec.IsGeneric || type.IsGenericTypeDefinition)
 655                                         return spec;
 656
 657                                 if (!dtype.HasDynamicAttribute (this))
 658                                         return spec;
 659
 660                                 // We've found same object in the cache but this one has a dynamic custom attribute
 661                                 // and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
 662                                 // Do type resolve process again in that case
 663
 664                                 // TODO: Handle cases where they still unify
 665                         }
 666
 667                         if (IsMissingType (type)) {
 668                                 spec = new TypeSpec (MemberKind.MissingType, declaringType, new ImportedTypeDefinition (type, this), type, Modifiers.PUBLIC);
 669                                 spec.MemberCache = MemberCache.Empty;
 670                                 import_cache.Add (type, spec);
 671                                 return spec;
 672                         }
 673
 674                         if (type.IsGenericType && !type.IsGenericTypeDefinition) {
 675                                 var type_def = type.GetGenericTypeDefinition ();
 676                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 677                                 if (declaringType == null) {
 678                                         // Simple case, no nesting
 679                                         spec = CreateType (type_def, null, new DynamicTypeReader (), canImportBaseType);
 680                                         spec = spec.MakeGenericType (module, targs);
 681                                 } else {
 682                                         //
 683                                         // Nested type case, converting .NET types like
 684                                         // A`1.B`1.C`1<int, long, string> to typespec like
 685                                         // A<int>.B<long>.C<string>
 686                                         //
 687                                         var nested_hierarchy = new List<TypeSpec> ();
 688                                         while (declaringType.IsNested) {
 689                                                 nested_hierarchy.Add (declaringType);
 690                                                 declaringType = declaringType.DeclaringType;
 691                                         }
 692
 693                                         int targs_pos = 0;
 694                                         if (declaringType.Arity > 0) {
 695                                                 spec = declaringType.MakeGenericType (module, targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
 696                                                 targs_pos = spec.Arity;
 697                                         } else {
 698                                                 spec = declaringType;
 699                                         }
 700
 701                                         for (int i = nested_hierarchy.Count; i != 0; --i) {
 702                                                 var t = nested_hierarchy [i - 1];
 703                                                 spec = MemberCache.FindNestedType (spec, t.Name, t.Arity);
 704                                                 if (t.Arity > 0) {
 705                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
 706                                                         targs_pos += t.Arity;
 707                                                 }
 708                                         }
 709
 710                                         string name = type.Name;
 711                                         int index = name.IndexOf ('`');
 712                                         if (index > 0)
 713                                                 name = name.Substring (0, index);
 714
 715                                         spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos);
 716                                         if (spec.Arity > 0) {
 717                                                 spec = spec.MakeGenericType (module, targs.Skip (targs_pos).ToArray ());
 718                                         }
 719                                 }
 720
 721                                 // Don't add generic type with dynamic arguments, they can interfere with same type
 722                                 // using object type arguments
 723                                 if (!spec.HasDynamicElement) {
 724
 725                                         // Add to reading cache to speed up reading
 726                                         if (!import_cache.ContainsKey (type))
 727                                                 import_cache.Add (type, spec);
 728                                 }
 729
 730                                 return spec;
 731                         }
 732
 733                         Modifiers mod;
 734                         MemberKind kind;
 735
 736                         var ma = type.Attributes;
 737                         switch (ma & TypeAttributes.VisibilityMask) {
 738                         case TypeAttributes.Public:
 739                         case TypeAttributes.NestedPublic:
 740                                 mod = Modifiers.PUBLIC;
 741                                 break;
 742                         case TypeAttributes.NestedPrivate:
 743                                 mod = Modifiers.PRIVATE;
 744                                 break;
 745                         case TypeAttributes.NestedFamily:
 746                                 mod = Modifiers.PROTECTED;
 747                                 break;
 748                         case TypeAttributes.NestedFamORAssem:
 749                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 750                                 break;
 751                         default:
 752                                 mod = Modifiers.INTERNAL;
 753                                 break;
 754                         }
 755
 756                         if ((ma & TypeAttributes.Interface) != 0) {
 757                                 kind = MemberKind.Interface;
 758                         } else if (type.IsGenericParameter) {
 759                                 kind = MemberKind.TypeParameter;
 760                         } else {
 761                                 var base_type = type.BaseType;
 762                                 if (base_type == null || (ma & TypeAttributes.Abstract) != 0) {
 763                                         kind = MemberKind.Class;
 764                                 } else {
 765                                         kind = DetermineKindFromBaseType (base_type);
 766                                         if (kind == MemberKind.Struct || kind == MemberKind.Delegate) {
 767                                                 mod |= Modifiers.SEALED;
 768                                         }
 769                                 }
 770
 771                                 if (kind == MemberKind.Class) {
 772                                         if ((ma & TypeAttributes.Sealed) != 0) {
 773                                                 mod |= Modifiers.SEALED;
 774                                                 if ((ma & TypeAttributes.Abstract) != 0)
 775                                                         mod |= Modifiers.STATIC;
 776                                         } else if ((ma & TypeAttributes.Abstract) != 0) {
 777                                                 mod |= Modifiers.ABSTRACT;
 778                                         }
 779                                 }
 780                         }
 781
 782                         var definition = new ImportedTypeDefinition (type, this);
 783                         TypeSpec pt;
 784
 785                         if (kind == MemberKind.Enum) {
 786                                 const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
 787                                         BindingFlags.Instance |
 788                                         BindingFlags.Public | BindingFlags.NonPublic;
 789
 790                                 var type_members = type.GetFields (underlying_member);
 791                                 foreach (var type_member in type_members) {
 792                                         spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
 793                                         break;
 794                                 }
 795
 796                                 if (spec == null)
 797                                         kind = MemberKind.Class;
 798
 799                         } else if (kind == MemberKind.TypeParameter) {
 800                                 spec = CreateTypeParameter (type, declaringType);
 801                         } else if (type.IsGenericTypeDefinition) {
 802                                 definition.TypeParameters = CreateGenericParameters (type, declaringType);
 803                         } else if (compiled_types.TryGetValue (type, out pt)) {
 804                                 //
 805                                 // Same type was found in inside compiled types. It's
 806                                 // either build-in type or forward referenced typed
 807                                 // which point into just compiled assembly.
 808                                 //
 809                                 spec = pt;
 810                                 BuildinTypeSpec bts = pt as BuildinTypeSpec;
 811                                 if (bts != null)
 812                                         bts.SetDefinition (definition, type, mod);
 813                         }
 814
 815                         if (spec == null)
 816                                 spec = new TypeSpec (kind, declaringType, definition, type, mod);
 817
 818                         import_cache.Add (type, spec);
 819
 820                         //
 821                         // Two stage setup as the base type can be inflated declaring type or
 822                         // another nested type inside same declaring type which has not been
 823                         // loaded, therefore we can import a base type of nested types once
 824                         // the types have been imported
 825                         //
 826                         if (canImportBaseType)
 827                                 ImportTypeBase (spec, type);
 828
 829                         return spec;
 830                 }
 831
 832                 public IAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
 833                 {
 834                         IAssemblyDefinition found;
 835                         if (!assembly_2_definition.TryGetValue (assembly, out found)) {
 836
 837                                 // This can happen in dynamic context only
 838                                 var def = new ImportedAssemblyDefinition (assembly, this);
 839                                 assembly_2_definition.Add (assembly, def);
 840                                 def.ReadAttributes ();
 841                                 found = def;
 842                         }
 843
 844                         return found;
 845                 }
 846
 847                 public void ImportTypeBase (MetaType type)
 848                 {
 849                         TypeSpec spec = import_cache[type];
 850                         if (spec != null)
 851                                 ImportTypeBase (spec, type);
 852                 }
 853
 854                 TypeParameterSpec CreateTypeParameter (MetaType type, TypeSpec declaringType)
 855                 {
 856                         Variance variance;
 857                         switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
 858                         case GenericParameterAttributes.Covariant:
 859                                 variance = Variance.Covariant;
 860                                 break;
 861                         case GenericParameterAttributes.Contravariant:
 862                                 variance = Variance.Contravariant;
 863                                 break;
 864                         default:
 865                                 variance = Variance.None;
 866                                 break;
 867                         }
 868
 869                         SpecialConstraint special = SpecialConstraint.None;
 870                         var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
 871
 872                         if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
 873                                 special |= SpecialConstraint.Struct;
 874                         } else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
 875                                 special = SpecialConstraint.Constructor;
 876                         }
 877
 878                         if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
 879                                 special |= SpecialConstraint.Class;
 880                         }
 881
 882                         TypeParameterSpec spec;
 883                         var def = new ImportedTypeParameterDefinition (type, this);
 884                         if (type.DeclaringMethod != null) {
 885                                 spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
 886                         } else {
 887                                 spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
 888                         }
 889
 890                         return spec;
 891                 }
 892
 893                 //
 894                 // Test for a custom attribute type match. Custom attributes are not really predefined globaly
 895                 // they can be assembly specific therefore we do check based on names only
 896                 //
 897                 public bool HasAttribute (IList<CustomAttributeData> attributesData, string attrName, string attrNamespace)
 898                 {
 899                         if (attributesData.Count == 0)
 900                                 return false;
 901
 902                         string ns, name;
 903                         foreach (var attr in attributesData) {
 904                                 GetCustomAttributeTypeName (attr, out ns, out name);
 905                                 if (name == attrName && ns == attrNamespace)
 906                                         return true;
 907                         }
 908
 909                         return false;
 910                 }
 911
 912                 void ImportTypeBase (TypeSpec spec, MetaType type)
 913                 {
 914                         if (spec.Kind == MemberKind.Interface)
 915                                 spec.BaseType = module.Compiler.BuildinTypes.Object;
 916                         else if (type.BaseType != null) {
 917                                 TypeSpec base_type;
 918                                 if (!IsMissingType (type.BaseType) && type.BaseType.IsGenericType)
 919                                         base_type = CreateType (type.BaseType, new DynamicTypeReader (type), true);
 920                                 else
 921                                         base_type = CreateType (type.BaseType);
 922
 923                                 spec.BaseType = base_type;
 924                         }
 925
 926                         MetaType[] ifaces;
 927 #if STATIC
 928                         ifaces = type.__GetDeclaredInterfaces ();
 929                         if (ifaces.Length != 0) {
 930                                 foreach (var iface in ifaces) {
 931                                         var it = CreateType (iface);
 932                                         spec.AddInterface (it);
 933
 934                                         // Unfortunatelly not all languages inlcude inherited interfaces
 935                                         var bifaces = it.Interfaces;
 936                                         if (bifaces != null) {
 937                                                 foreach (var biface in bifaces) {
 938                                                         spec.AddInterface (biface);
 939                                                 }
 940                                         }
 941                                 }
 942                         }
 943
 944                         if (spec.BaseType != null) {
 945                                 var bifaces = spec.BaseType.Interfaces;
 946                                 if (bifaces != null) {
 947                                         foreach (var iface in bifaces)
 948                                                 spec.AddInterface (iface);
 949                                 }
 950                         }
 951 #else
 952                         ifaces = type.GetInterfaces ();
 953
 954                         if (ifaces.Length > 0) {
 955                                 foreach (var iface in ifaces) {
 956                                         spec.AddInterface (CreateType (iface));
 957                                 }
 958                         }
 959 #endif
 960
 961                         if (spec.MemberDefinition.TypeParametersCount > 0) {
 962                                 foreach (var tp in spec.MemberDefinition.TypeParameters) {
 963                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
 964                                 }
 965                         }
 966
 967                 }
 968
 969                 protected void ImportTypes (MetaType[] types, Namespace targetNamespace, bool hasExtensionTypes)
 970                 {
 971                         Namespace ns = targetNamespace;
 972                         string prev_namespace = null;
 973                         foreach (var t in types) {
 974                                 if (t == null)
 975                                         continue;
 976
 977                                 // Be careful not to trigger full parent type loading
 978                                 if (t.MemberType == MemberTypes.NestedType)
 979                                         continue;
 980
 981                                 if (t.Name[0] == '<')
 982                                         continue;
 983
 984                                 var it = CreateType (t, null, new DynamicTypeReader (t), true);
 985                                 if (it == null)
 986                                         continue;
 987
 988                                 if (prev_namespace != t.Namespace) {
 989                                         ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
 990                                         prev_namespace = t.Namespace;
 991                                 }
 992
 993                                 ns.AddType (it);
 994
 995                                 if (it.IsStatic && hasExtensionTypes &&
 996                                         HasAttribute (CustomAttributeData.GetCustomAttributes (t), "ExtensionAttribute", CompilerServicesNamespace)) {
 997                                         it.SetExtensionMethodContainer ();
 998                                 }
 999                         }
1000                 }
1001
1002                 void ImportTypeParameterTypeConstraints (TypeParameterSpec spec, MetaType type)
1003                 {
1004                         var constraints = type.GetGenericParameterConstraints ();
1005                         List<TypeSpec> tparams = null;
1006                         foreach (var ct in constraints) {
1007                                 if (ct.IsGenericParameter) {
1008                                         if (tparams == null)
1009                                                 tparams = new List<TypeSpec> ();
1010
1011                                         tparams.Add (CreateType (ct));
1012                                         continue;
1013                                 }
1014
1015                                 if (!IsMissingType (ct) && ct.IsClass) {
1016                                         spec.BaseType = CreateType (ct);
1017                                         continue;
1018                                 }
1019
1020                                 spec.AddInterface (CreateType (ct));
1021                         }
1022
1023                         if (spec.BaseType == null)
1024                                 spec.BaseType = module.Compiler.BuildinTypes.Object;
1025
1026                         if (tparams != null)
1027                                 spec.TypeArguments = tparams.ToArray ();
1028                 }
1029
1030                 Constant ImportParameterConstant (object value)
1031                 {
1032                         //
1033                         // Get type of underlying value as int constant can be used for object
1034                         // parameter type. This is not allowed in C# but other languages can do that
1035                         //
1036                         var types = module.Compiler.BuildinTypes;
1037                         switch (System.Type.GetTypeCode (value.GetType ())) {
1038                         case TypeCode.Boolean:
1039                                 return new BoolConstant (types, (bool) value, Location.Null);
1040                         case TypeCode.Byte:
1041                                 return new ByteConstant (types, (byte) value, Location.Null);
1042                         case TypeCode.Char:
1043                                 return new CharConstant (types, (char) value, Location.Null);
1044                         case TypeCode.Decimal:
1045                                 return new DecimalConstant (types, (decimal) value, Location.Null);
1046                         case TypeCode.Double:
1047                                 return new DoubleConstant (types, (double) value, Location.Null);
1048                         case TypeCode.Int16:
1049                                 return new ShortConstant (types, (short) value, Location.Null);
1050                         case TypeCode.Int32:
1051                                 return new IntConstant (types, (int) value, Location.Null);
1052                         case TypeCode.Int64:
1053                                 return new LongConstant (types, (long) value, Location.Null);
1054                         case TypeCode.SByte:
1055                                 return new SByteConstant (types, (sbyte) value, Location.Null);
1056                         case TypeCode.Single:
1057                                 return new FloatConstant (types, (float) value, Location.Null);
1058                         case TypeCode.String:
1059                                 return new StringConstant (types, (string) value, Location.Null);
1060                         case TypeCode.UInt16:
1061                                 return new UShortConstant (types, (ushort) value, Location.Null);
1062                         case TypeCode.UInt32:
1063                                 return new UIntConstant (types, (uint) value, Location.Null);
1064                         case TypeCode.UInt64:
1065                                 return new ULongConstant (types, (ulong) value, Location.Null);
1066                         }
1067
1068                         throw new NotImplementedException (value.GetType ().ToString ());
1069                 }
1070
1071                 public TypeSpec ImportType (MetaType type)
1072                 {
1073                         return ImportType (type, new DynamicTypeReader (type));
1074                 }
1075
1076                 TypeSpec ImportType (MetaType type, DynamicTypeReader dtype)
1077                 {
1078                         if (type.HasElementType) {
1079                                 var element = type.GetElementType ();
1080                                 ++dtype.Position;
1081                                 var spec = ImportType (element, dtype);
1082
1083                                 if (type.IsArray)
1084                                         return ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
1085                                 if (type.IsByRef)
1086                                         return ReferenceContainer.MakeType (module, spec);
1087                                 if (type.IsPointer)
1088                                         return PointerContainer.MakeType (module, spec);
1089
1090                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
1091                         }
1092
1093                         return CreateType (type, dtype, true);
1094                 }
1095
1096                 static bool IsMissingType (MetaType type)
1097                 {
1098 #if STATIC
1099                         return type.__IsMissing;
1100 #else
1101                         return false;
1102 #endif
1103                 }
1104
1105                 //
1106                 // Decimal constants cannot be encoded in the constant blob, and thus are marked
1107                 // as IsInitOnly ('readonly' in C# parlance).  We get its value from the
1108                 // DecimalConstantAttribute metadata.
1109                 //
1110                 Constant ReadDecimalConstant (IList<CustomAttributeData> attrs)
1111                 {
1112                         if (attrs.Count == 0)
1113                                 return null;
1114
1115                         string name, ns;
1116                         foreach (var ca in attrs) {
1117                                 GetCustomAttributeTypeName (ca, out ns, out name);
1118                                 if (name != "DecimalConstantAttribute" || ns != CompilerServicesNamespace)
1119                                         continue;
1120
1121                                 var value = new decimal (
1122                                         (int) (uint) ca.ConstructorArguments[4].Value,
1123                                         (int) (uint) ca.ConstructorArguments[3].Value,
1124                                         (int) (uint) ca.ConstructorArguments[2].Value,
1125                                         (byte) ca.ConstructorArguments[1].Value != 0,
1126                                         (byte) ca.ConstructorArguments[0].Value);
1127
1128                                 return new DecimalConstant (module.Compiler.BuildinTypes, value, Location.Null);
1129                         }
1130
1131                         return null;
1132                 }
1133
1134                 static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
1135                 {
1136                         Modifiers mod;
1137                         var ma = mb.Attributes;
1138                         switch (ma & MethodAttributes.MemberAccessMask) {
1139                         case MethodAttributes.Public:
1140                                 mod = Modifiers.PUBLIC;
1141                                 break;
1142                         case MethodAttributes.Assembly:
1143                                 mod = Modifiers.INTERNAL;
1144                                 break;
1145                         case MethodAttributes.Family:
1146                                 mod = Modifiers.PROTECTED;
1147                                 break;
1148                         case MethodAttributes.FamORAssem:
1149                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
1150                                 break;
1151                         default:
1152                                 mod = Modifiers.PRIVATE;
1153                                 break;
1154                         }
1155
1156                         if ((ma & MethodAttributes.Static) != 0) {
1157                                 mod |= Modifiers.STATIC;
1158                                 return mod;
1159                         }
1160                         if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
1161                                 mod |= Modifiers.ABSTRACT;
1162                                 return mod;
1163                         }
1164
1165                         if ((ma & MethodAttributes.Final) != 0)
1166                                 mod |= Modifiers.SEALED;
1167
1168                         // It can be sealed and override
1169                         if ((ma & MethodAttributes.Virtual) != 0) {
1170                                 if ((ma & MethodAttributes.NewSlot) != 0 || !declaringType.IsClass) {
1171                                         // No private virtual or sealed virtual
1172                                         if ((mod & (Modifiers.PRIVATE | Modifiers.SEALED)) == 0)
1173                                                 mod |= Modifiers.VIRTUAL;
1174                                 } else {
1175                                         mod |= Modifiers.OVERRIDE;
1176                                 }
1177                         }
1178
1179                         return mod;
1180                 }
1181         }
1182
1183         abstract class ImportedDefinition : IMemberDefinition
1184         {
1185                 protected class AttributesBag
1186                 {
1187                         public static readonly AttributesBag Default = new AttributesBag ();
1188
1189                         public AttributeUsageAttribute AttributeUsage;
1190                         public ObsoleteAttribute Obsolete;
1191                         public string[] Conditionals;
1192                         public string DefaultIndexerName;
1193                         public bool? CLSAttributeValue;
1194                         public TypeSpec CoClass;
1195
1196                         public static AttributesBag Read (MemberInfo mi, MetadataImporter importer)
1197                         {
1198                                 AttributesBag bag = null;
1199                                 List<string> conditionals = null;
1200
1201                                 // It should not throw any loading exception
1202                                 IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
1203
1204                                 string ns, name;
1205                                 foreach (var a in attrs) {
1206                                         importer.GetCustomAttributeTypeName (a, out ns, out name);
1207                                         if (name == "ObsoleteAttribute") {
1208                                                 if (ns != "System")
1209                                                         continue;
1210
1211                                                 if (bag == null)
1212                                                         bag = new AttributesBag ();
1213
1214                                                 var args = a.ConstructorArguments;
1215
1216                                                 if (args.Count == 1) {
1217                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
1218                                                 } else if (args.Count == 2) {
1219                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
1220                                                 } else {
1221                                                         bag.Obsolete = new ObsoleteAttribute ();
1222                                                 }
1223
1224                                                 continue;
1225                                         }
1226
1227                                         if (name == "ConditionalAttribute") {
1228                                                 if (ns != "System.Diagnostics")
1229                                                         continue;
1230
1231                                                 if (bag == null)
1232                                                         bag = new AttributesBag ();
1233
1234                                                 if (conditionals == null)
1235                                                         conditionals = new List<string> (2);
1236
1237                                                 conditionals.Add ((string) a.ConstructorArguments[0].Value);
1238                                                 continue;
1239                                         }
1240
1241                                         if (name == "CLSCompliantAttribute") {
1242                                                 if (ns != "System")
1243                                                         continue;
1244
1245                                                 if (bag == null)
1246                                                         bag = new AttributesBag ();
1247
1248                                                 bag.CLSAttributeValue = (bool) a.ConstructorArguments[0].Value;
1249                                                 continue;
1250                                         }
1251
1252                                         // Type only attributes
1253                                         if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
1254                                                 if (name == "DefaultMemberAttribute") {
1255                                                         if (ns != "System.Reflection")
1256                                                                 continue;
1257
1258                                                         if (bag == null)
1259                                                                 bag = new AttributesBag ();
1260
1261                                                         bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
1262                                                         continue;
1263                                                 }
1264
1265                                                 if (name == "AttributeUsageAttribute") {
1266                                                         if (ns != "System")
1267                                                                 continue;
1268
1269                                                         if (bag == null)
1270                                                                 bag = new AttributesBag ();
1271
1272                                                         bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
1273                                                         foreach (var named in a.NamedArguments) {
1274                                                                 if (named.MemberInfo.Name == "AllowMultiple")
1275                                                                         bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
1276                                                                 else if (named.MemberInfo.Name == "Inherited")
1277                                                                         bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
1278                                                         }
1279                                                         continue;
1280                                                 }
1281
1282                                                 // Interface only attribute
1283                                                 if (name == "CoClassAttribute") {
1284                                                         if (ns != "System.Runtime.InteropServices")
1285                                                                 continue;
1286
1287                                                         if (bag == null)
1288                                                                 bag = new AttributesBag ();
1289
1290                                                         bag.CoClass = importer.ImportType ((MetaType) a.ConstructorArguments[0].Value);
1291                                                         continue;
1292                                                 }
1293                                         }
1294                                 }
1295
1296                                 if (bag == null)
1297                                         return Default;
1298
1299                                 if (conditionals != null)
1300                                         bag.Conditionals = conditionals.ToArray ();
1301
1302                                 return bag;
1303                         }
1304                 }
1305
1306                 protected readonly MemberInfo provider;
1307                 protected AttributesBag cattrs;
1308                 protected readonly MetadataImporter importer;
1309
1310                 public ImportedDefinition (MemberInfo provider, MetadataImporter importer)
1311                 {
1312                         this.provider = provider;
1313                         this.importer = importer;
1314                 }
1315
1316                 #region Properties
1317
1318                 public bool IsImported {
1319                         get {
1320                                 return true;
1321                         }
1322                 }
1323
1324                 public virtual string Name {
1325                         get {
1326                                 return provider.Name;
1327                         }
1328                 }
1329
1330                 #endregion
1331
1332                 public string[] ConditionalConditions ()
1333                 {
1334                         if (cattrs == null)
1335                                 ReadAttributes ();
1336
1337                         return cattrs.Conditionals;
1338                 }
1339
1340                 public ObsoleteAttribute GetAttributeObsolete ()
1341                 {
1342                         if (cattrs == null)
1343                                 ReadAttributes ();
1344
1345                         return cattrs.Obsolete;
1346                 }
1347
1348                 public bool? CLSAttributeValue {
1349                         get {
1350                                 if (cattrs == null)
1351                                         ReadAttributes ();
1352
1353                                 return cattrs.CLSAttributeValue;
1354                         }
1355                 }
1356
1357                 protected void ReadAttributes ()
1358                 {
1359                         cattrs = AttributesBag.Read (provider, importer);
1360                 }
1361
1362                 public void SetIsAssigned ()
1363                 {
1364                         // Unused for imported members
1365                 }
1366
1367                 public void SetIsUsed ()
1368                 {
1369                         // Unused for imported members
1370                 }
1371         }
1372
1373         public class ImportedModuleDefinition
1374         {
1375                 readonly Module module;
1376                 bool cls_compliant;
1377                 readonly MetadataImporter importer;
1378
1379                 public ImportedModuleDefinition (Module module, MetadataImporter importer)
1380                 {
1381                         this.module = module;
1382                         this.importer = importer;
1383                 }
1384
1385                 #region Properties
1386
1387                 public bool IsCLSCompliant {
1388                         get {
1389                                 return cls_compliant;
1390                         }
1391                 }
1392
1393                 public string Name {
1394                         get {
1395                                 return module.Name;
1396                         }
1397                 }
1398
1399                 #endregion
1400
1401                 public void ReadAttributes ()
1402                 {
1403                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
1404
1405                         string ns, name;
1406                         foreach (var a in attrs) {
1407                                 importer.GetCustomAttributeTypeName (a, out ns, out name);
1408                                 if (name == "CLSCompliantAttribute") {
1409                                         if (ns != "System")
1410                                                 continue;
1411
1412                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1413                                         continue;
1414                                 }
1415                         }
1416                 }
1417
1418                 //
1419                 // Reads assembly attributes which where attached to a special type because
1420                 // module does have assembly manifest
1421                 //
1422                 public List<Attribute> ReadAssemblyAttributes ()
1423                 {
1424                         var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
1425                         if (t == null)
1426                                 return null;
1427
1428                         var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
1429                         if (field == null)
1430                                 return null;
1431
1432                         // TODO: implement, the idea is to fabricate specil Attribute class and
1433                         // add it to OptAttributes before resolving the source code attributes
1434                         // Need to build module location as well for correct error reporting
1435
1436                         //var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
1437                         //var attrs = new List<Attribute> (assembly_attributes.Count);
1438                         //foreach (var a in assembly_attributes)
1439                         //{
1440                         //    var type = metaImporter.ImportType (a.Constructor.DeclaringType);
1441                         //    var ctor = metaImporter.CreateMethod (a.Constructor, type);
1442
1443                         //    foreach (var carg in a.ConstructorArguments) {
1444                         //        carg.Value
1445                         //    }
1446
1447                         //    attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
1448                         //}
1449
1450                         return null;
1451                 }
1452         }
1453
1454         public class ImportedAssemblyDefinition : IAssemblyDefinition
1455         {
1456                 readonly Assembly assembly;
1457                 readonly AssemblyName aname;
1458                 readonly MetadataImporter importer;
1459                 bool cls_compliant;
1460                 bool contains_extension_methods;
1461
1462                 List<AssemblyName> internals_visible_to;
1463                 Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
1464
1465                 public ImportedAssemblyDefinition (Assembly assembly, MetadataImporter importer)
1466                 {
1467                         this.assembly = assembly;
1468                         this.aname = assembly.GetName ();
1469                         this.importer = importer;
1470                 }
1471
1472                 #region Properties
1473
1474                 public Assembly Assembly {
1475                         get {
1476                                 return assembly;
1477                         }
1478                 }
1479
1480                 public string FullName {
1481                         get {
1482                                 return aname.FullName;
1483                         }
1484                 }
1485
1486                 public bool HasExtensionMethod {
1487                         get {
1488                                 return contains_extension_methods;
1489                         }
1490                 }
1491
1492                 public bool HasStrongName {
1493                         get {
1494                                 return aname.GetPublicKey ().Length != 0;
1495                         }
1496                 }
1497
1498                 public bool IsMissing {
1499                         get {
1500 #if STATIC
1501                                 return assembly.__IsMissing;
1502 #else
1503                                 return false;
1504 #endif
1505                         }
1506                 }
1507
1508                 public bool IsCLSCompliant {
1509                         get {
1510                                 return cls_compliant;
1511                         }
1512                 }
1513
1514                 public string Location {
1515                         get {
1516                                 return assembly.Location;
1517                         }
1518                 }
1519
1520                 public string Name {
1521                         get {
1522                                 return aname.Name;
1523                         }
1524                 }
1525
1526                 #endregion
1527
1528                 public byte[] GetPublicKeyToken ()
1529                 {
1530                         return aname.GetPublicKeyToken ();
1531                 }
1532
1533                 public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
1534                 {
1535                         return internals_visible_to_cache [assembly];
1536                 }
1537
1538                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1539                 {
1540                         if (internals_visible_to == null)
1541                                 return false;
1542
1543                         AssemblyName is_visible = null;
1544                         if (internals_visible_to_cache == null) {
1545                                 internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
1546                         } else {
1547                                 if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
1548                                         return is_visible != null;
1549                         }
1550
1551                         var token = assembly.GetPublicKeyToken ();
1552                         if (token != null && token.Length == 0)
1553                                 token = null;
1554
1555                         foreach (var internals in internals_visible_to) {
1556                                 if (internals.Name != assembly.Name)
1557                                         continue;
1558
1559                                 if (token == null && assembly is AssemblyDefinition) {
1560                                         is_visible = internals;
1561                                         break;
1562                                 }
1563
1564                                 if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
1565                                         continue;
1566
1567                                 is_visible = internals;
1568                                 break;
1569                         }
1570
1571                         internals_visible_to_cache.Add (assembly, is_visible);
1572                         return is_visible != null;
1573                 }
1574
1575                 public void ReadAttributes ()
1576                 {
1577 #if STATIC
1578                         if (assembly.__IsMissing)
1579                                 return;
1580 #endif
1581
1582                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
1583
1584                         string ns, name;
1585                         foreach (var a in attrs) {
1586                                 importer.GetCustomAttributeTypeName (a, out ns, out name);
1587
1588                                 if (name == "CLSCompliantAttribute") {
1589                                         if (ns == "System") {
1590                                                 try {
1591                                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1592                                                 } catch {
1593                                                 }
1594                                         }
1595                                         continue;
1596                                 }
1597
1598                                 if (name == "InternalsVisibleToAttribute") {
1599                                         if (ns != MetadataImporter.CompilerServicesNamespace)
1600                                                 continue;
1601
1602                                         string s;
1603                                         try {
1604                                                 s = a.ConstructorArguments[0].Value as string;
1605                                         } catch {
1606                                                 s = null;
1607                                         }
1608
1609                                         if (s == null)
1610                                                 continue;
1611
1612                                         var an = new AssemblyName (s);
1613                                         if (internals_visible_to == null)
1614                                                 internals_visible_to = new List<AssemblyName> ();
1615
1616                                         internals_visible_to.Add (an);
1617                                         continue;
1618                                 }
1619
1620                                 if (name == "ExtensionAttribute") {
1621                                         if (ns == MetadataImporter.CompilerServicesNamespace)
1622                                                 contains_extension_methods = true;
1623
1624                                         continue;
1625                                 }
1626                         }
1627                 }
1628
1629                 public override string ToString ()
1630                 {
1631                         return FullName;
1632                 }
1633         }
1634
1635         class ImportedMemberDefinition : ImportedDefinition
1636         {
1637                 readonly TypeSpec type;
1638
1639                 public ImportedMemberDefinition (MemberInfo member, TypeSpec type, MetadataImporter importer)
1640                         : base (member, importer)
1641                 {
1642                         this.type = type;
1643                 }
1644
1645                 #region Properties
1646
1647                 public TypeSpec MemberType {
1648                         get {
1649                                 return type;
1650                         }
1651                 }
1652
1653                 #endregion
1654         }
1655
1656         class ImportedParameterMemberDefinition : ImportedMemberDefinition, IParametersMember
1657         {
1658                 readonly AParametersCollection parameters;
1659
1660                 public ImportedParameterMemberDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1661                         : base (provider, type, importer)
1662                 {
1663                         this.parameters = parameters;
1664                 }
1665
1666                 public ImportedParameterMemberDefinition (PropertyInfo provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1667                         : base (provider, type, importer)
1668                 {
1669                         this.parameters = parameters;
1670                 }
1671
1672                 #region Properties
1673
1674                 public AParametersCollection Parameters {
1675                         get {
1676                                 return parameters;
1677                         }
1678                 }
1679
1680                 #endregion
1681         }
1682
1683         class ImportedGenericMethodDefinition : ImportedParameterMemberDefinition, IGenericMethodDefinition
1684         {
1685                 readonly TypeParameterSpec[] tparams;
1686
1687                 public ImportedGenericMethodDefinition (MethodInfo provider, TypeSpec type, AParametersCollection parameters, TypeParameterSpec[] tparams, MetadataImporter importer)
1688                         : base (provider, type, parameters, importer)
1689                 {
1690                         this.tparams = tparams;
1691                 }
1692
1693                 #region Properties
1694
1695                 public TypeParameterSpec[] TypeParameters {
1696                         get {
1697                                 return tparams;
1698                         }
1699                 }
1700
1701                 public int TypeParametersCount {
1702                         get {
1703                                 return tparams.Length;
1704                         }
1705                 }
1706
1707                 #endregion
1708         }
1709
1710         class ImportedTypeDefinition : ImportedDefinition, ITypeDefinition
1711         {
1712                 TypeParameterSpec[] tparams;
1713                 string name;
1714
1715                 public ImportedTypeDefinition (MetaType type, MetadataImporter importer)
1716                         : base (type, importer)
1717                 {
1718                 }
1719
1720                 #region Properties
1721
1722                 public IAssemblyDefinition DeclaringAssembly {
1723                         get {
1724                                 return importer.GetAssemblyDefinition (provider.Module.Assembly);
1725                         }
1726                 }
1727
1728                 public override string Name {
1729                         get {
1730                                 if (name == null) {
1731                                         name = base.Name;
1732                                         if (tparams != null) {
1733                                                 int arity_start = name.IndexOf ('`');
1734                                                 if (arity_start > 0)
1735                                                         name = name.Substring (0, arity_start);
1736                                         }
1737                                 }
1738
1739                                 return name;
1740                         }
1741                 }
1742
1743                 public string Namespace {
1744                         get {
1745                                 return ((MetaType) provider).Namespace;
1746                         }
1747                 }
1748
1749                 public int TypeParametersCount {
1750                         get {
1751                                 return tparams == null ? 0 : tparams.Length;
1752                         }
1753                 }
1754
1755                 public TypeParameterSpec[] TypeParameters {
1756                         get {
1757                                 return tparams;
1758                         }
1759                         set {
1760                                 tparams = value;
1761                         }
1762                 }
1763
1764                 #endregion
1765
1766                 public static void Error_MissingDependency (IMemberContext ctx, List<TypeSpec> types, Location loc)
1767                 {
1768                         //
1769                         // Report details about missing type and most likely cause of the problem.
1770                         // csc reports 1683, 1684 as warnings but we report them only when used
1771                         // or referenced from the user core in which case compilation error has to
1772                         // be reported because compiler cannot continue anyway
1773                         //
1774                         foreach (var t in types) {
1775                                 string name = t.GetSignatureForError ();
1776
1777                                 if (t.MemberDefinition.DeclaringAssembly == ctx.Module.DeclaringAssembly) {
1778                                         ctx.Module.Compiler.Report.Error (1683, loc,
1779                                                 "Reference to type `{0}' claims it is defined in this assembly, but it is not defined in source or any added modules",
1780                                                 name);
1781                                 } else if (t.MemberDefinition.DeclaringAssembly.IsMissing) {
1782                                         ctx.Module.Compiler.Report.Error (12, loc,
1783                                                 "The type `{0}' is defined in an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
1784                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
1785                                 } else {
1786                                         ctx.Module.Compiler.Report.Error (1684, loc,
1787                                                 "Reference to type `{0}' claims it is defined assembly `{1}', but it could not be found",
1788                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
1789                                 }
1790                         }
1791                 }
1792
1793                 public TypeSpec GetAttributeCoClass ()
1794                 {
1795                         if (cattrs == null)
1796                                 ReadAttributes ();
1797
1798                         return cattrs.CoClass;
1799                 }
1800
1801                 public string GetAttributeDefaultMember ()
1802                 {
1803                         if (cattrs == null)
1804                                 ReadAttributes ();
1805
1806                         return cattrs.DefaultIndexerName;
1807                 }
1808
1809                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
1810                 {
1811                         if (cattrs == null)
1812                                 ReadAttributes ();
1813
1814                         return cattrs.AttributeUsage;
1815                 }
1816
1817                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
1818                 {
1819                         var a = importer.GetAssemblyDefinition (provider.Module.Assembly);
1820                         return a == assembly || a.IsFriendAssemblyTo (assembly);
1821                 }
1822
1823                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
1824                 {
1825                         //
1826                         // Not interested in members of nested private types unless the importer needs them
1827                         //
1828                         if (declaringType.IsPrivate && importer.IgnorePrivateMembers) {
1829                                 cache = MemberCache.Empty;
1830                                 return;
1831                         }
1832
1833                         var loading_type = (MetaType) provider;
1834                         const BindingFlags all_members = BindingFlags.DeclaredOnly |
1835                                 BindingFlags.Static | BindingFlags.Instance |
1836                                 BindingFlags.Public | BindingFlags.NonPublic;
1837
1838                         const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
1839                                         MethodAttributes.Virtual | MethodAttributes.HideBySig |
1840                                         MethodAttributes.Final;
1841
1842                         Dictionary<MethodBase, MethodSpec> possible_accessors = null;
1843                         List<EventSpec> imported_events = null;
1844                         EventSpec event_spec;
1845                         MemberSpec imported;
1846                         MethodInfo m;
1847                         MemberInfo[] all;
1848                         try {
1849                                 all = loading_type.GetMembers (all_members);
1850                         } catch (Exception e) {
1851                                 throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
1852                                         declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
1853                         }
1854
1855                         if (cache == null) {
1856                                 cache = new MemberCache (all.Length);
1857
1858                                 //
1859                                 // Do the types first as they can be referenced by the members before
1860                                 // they are found or inflated
1861                                 //
1862                                 foreach (var member in all) {
1863                                         if (member.MemberType != MemberTypes.NestedType)
1864                                                 continue;
1865
1866                                         var t = (MetaType) member;
1867
1868                                         // Ignore compiler generated types, mostly lambda containers
1869                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
1870                                                 continue;
1871
1872                                         imported = importer.CreateNestedType (t, declaringType);
1873                                         cache.AddMemberImported (imported);
1874                                 }
1875
1876                                 foreach (var member in all) {
1877                                         if (member.MemberType != MemberTypes.NestedType)
1878                                                 continue;
1879
1880                                         var t = (MetaType) member;
1881
1882                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
1883                                                 continue;
1884
1885                                         importer.ImportTypeBase (t);
1886                                 }
1887                         }
1888
1889                         if (!onlyTypes) {
1890                                 //
1891                                 // The logic here requires methods to be returned first which seems to work for both Mono and .NET
1892                                 //
1893                                 foreach (var member in all) {
1894                                         switch (member.MemberType) {
1895                                         case MemberTypes.Constructor:
1896                                         case MemberTypes.Method:
1897                                                 MethodBase mb = (MethodBase) member;
1898                                                 var attrs = mb.Attributes;
1899
1900                                                 if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
1901                                                         if (importer.IgnorePrivateMembers)
1902                                                                 continue;
1903
1904                                                         // Ignore explicitly implemented members
1905                                                         if ((attrs & explicit_impl) == explicit_impl)
1906                                                                 continue;
1907
1908                                                         // Ignore compiler generated methods
1909                                                         if (importer.HasAttribute (CustomAttributeData.GetCustomAttributes (mb), "CompilerGeneratedAttribute", MetadataImporter.CompilerServicesNamespace))
1910                                                                 continue;
1911                                                 }
1912
1913                                                 imported = importer.CreateMethod (mb, declaringType);
1914                                                 if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
1915                                                         if (possible_accessors == null)
1916                                                                 possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
1917
1918                                                         // There are no metadata rules for accessors, we have to consider any method as possible candidate
1919                                                         possible_accessors.Add (mb, (MethodSpec) imported);
1920                                                 }
1921
1922                                                 break;
1923                                         case MemberTypes.Property:
1924                                                 if (possible_accessors == null)
1925                                                         continue;
1926
1927                                                 var p = (PropertyInfo) member;
1928                                                 //
1929                                                 // Links possible accessors with property
1930                                                 //
1931                                                 MethodSpec get, set;
1932                                                 m = p.GetGetMethod (true);
1933                                                 if (m == null || !possible_accessors.TryGetValue (m, out get))
1934                                                         get = null;
1935
1936                                                 m = p.GetSetMethod (true);
1937                                                 if (m == null || !possible_accessors.TryGetValue (m, out set))
1938                                                         set = null;
1939
1940                                                 // No accessors registered (e.g. explicit implementation)
1941                                                 if (get == null && set == null)
1942                                                         continue;
1943
1944                                                 imported = importer.CreateProperty (p, declaringType, get, set);
1945                                                 if (imported == null)
1946                                                         continue;
1947
1948                                                 break;
1949                                         case MemberTypes.Event:
1950                                                 if (possible_accessors == null)
1951                                                         continue;
1952
1953                                                 var e = (EventInfo) member;
1954                                                 //
1955                                                 // Links accessors with event
1956                                                 //
1957                                                 MethodSpec add, remove;
1958                                                 m = e.GetAddMethod (true);
1959                                                 if (m == null || !possible_accessors.TryGetValue (m, out add))
1960                                                         add = null;
1961
1962                                                 m = e.GetRemoveMethod (true);
1963                                                 if (m == null || !possible_accessors.TryGetValue (m, out remove))
1964                                                         remove = null;
1965
1966                                                 // Both accessors are required
1967                                                 if (add == null || remove == null)
1968                                                         continue;
1969
1970                                                 event_spec = importer.CreateEvent (e, declaringType, add, remove);
1971                                                 if (!importer.IgnorePrivateMembers) {
1972                                                         if (imported_events == null)
1973                                                                 imported_events = new List<EventSpec> ();
1974
1975                                                         imported_events.Add (event_spec);
1976                                                 }
1977
1978                                                 imported = event_spec;
1979                                                 break;
1980                                         case MemberTypes.Field:
1981                                                 var fi = (FieldInfo) member;
1982
1983                                                 imported = importer.CreateField (fi, declaringType);
1984                                                 if (imported == null)
1985                                                         continue;
1986
1987                                                 //
1988                                                 // For dynamic binder event has to be fully restored to allow operations
1989                                                 // within the type container to work correctly
1990                                                 //
1991                                                 if (imported_events != null) {
1992                                                         // The backing event field should be private but it may not
1993                                                         int i;
1994                                                         for (i = 0; i < imported_events.Count; ++i) {
1995                                                                 var ev = imported_events[i];
1996                                                                 if (ev.Name == fi.Name) {
1997                                                                         ev.BackingField = (FieldSpec) imported;
1998                                                                         imported_events.RemoveAt (i);
1999                                                                         i = -1;
2000                                                                         break;
2001                                                                 }
2002                                                         }
2003
2004                                                         if (i < 0)
2005                                                                 continue;
2006                                                 }
2007
2008                                                 break;
2009                                         case MemberTypes.NestedType:
2010                                                 // Already in the cache from the first pass
2011                                                 continue;
2012                                         default:
2013                                                 throw new NotImplementedException (member.ToString ());
2014                                         }
2015
2016                                         cache.AddMemberImported (imported);
2017                                 }
2018                         }
2019
2020                         if (declaringType.IsInterface && declaringType.Interfaces != null) {
2021                                 foreach (var iface in declaringType.Interfaces) {
2022                                         cache.AddInterface (iface);
2023                                 }
2024                         }
2025                 }
2026         }
2027
2028         class ImportedTypeParameterDefinition : ImportedDefinition, ITypeDefinition
2029         {
2030                 public ImportedTypeParameterDefinition (MetaType type, MetadataImporter importer)
2031                         : base (type, importer)
2032                 {
2033                 }
2034
2035                 #region Properties
2036
2037                 public IAssemblyDefinition DeclaringAssembly {
2038                         get {
2039                                 throw new NotImplementedException ();
2040                         }
2041                 }
2042
2043                 public string Namespace {
2044                         get {
2045                                 return null;
2046                         }
2047                 }
2048
2049                 public int TypeParametersCount {
2050                         get {
2051                                 return 0;
2052                         }
2053                 }
2054
2055                 public TypeParameterSpec[] TypeParameters {
2056                         get {
2057                                 return null;
2058                         }
2059                 }
2060
2061                 #endregion
2062
2063                 public TypeSpec GetAttributeCoClass ()
2064                 {
2065                         return null;
2066                 }
2067
2068                 public string GetAttributeDefaultMember ()
2069                 {
2070                         throw new NotSupportedException ();
2071                 }
2072
2073                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2074                 {
2075                         throw new NotSupportedException ();
2076                 }
2077
2078                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2079                 {
2080                         throw new NotImplementedException ();
2081                 }
2082
2083                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2084                 {
2085                         throw new NotImplementedException ();
2086                 }
2087         }
2088 }