mcs/mcs/import.cs

   1 //
   2 // import.cs: System.Reflection conversions
   3 //
   4 // Authors: Marek Safar (marek.safar@gmail.com)
   5 //
   6 // Dual licensed under the terms of the MIT X11 or GNU GPL
   7 //
   8 // Copyright 2009-2011 Novell, Inc
   9 // Copyright 2011-2012 Xamarin, Inc (http://www.xamarin.com)
  10 //
  11
  12 using System;
  13 using System.Runtime.CompilerServices;
  14 using System.Linq;
  15 using System.Collections.Generic;
  16
  17 #if STATIC
  18 using MetaType = IKVM.Reflection.Type;
  19 using IKVM.Reflection;
  20 using IKVM.Reflection.Emit;
  21 #else
  22 using MetaType = System.Type;
  23 using System.Reflection;
  24 using System.Reflection.Emit;
  25 #endif
  26
  27 namespace Mono.CSharp
  28 {
  29         public abstract class MetadataImporter
  30         {
  31                 //
  32                 // Dynamic types reader with additional logic to reconstruct a dynamic
  33                 // type using DynamicAttribute values
  34                 //
  35                 protected struct DynamicTypeReader
  36                 {
  37                         static readonly bool[] single_attribute = { true };
  38
  39                         public int Position;
  40                         bool[] flags;
  41
  42                         // There is no common type for CustomAttributeData and we cannot
  43                         // use ICustomAttributeProvider
  44                         object provider;
  45
  46                         //
  47                         // A member provider which can be used to get CustomAttributeData
  48                         //
  49                         public DynamicTypeReader (object provider)
  50                         {
  51                                 Position = 0;
  52                                 flags = null;
  53                                 this.provider = provider;
  54                         }
  55
  56                         //
  57                         // Returns true when object at local position has dynamic attribute flag
  58                         //
  59                         public bool IsDynamicObject (MetadataImporter importer)
  60                         {
  61                                 if (provider != null)
  62                                         ReadAttribute (importer);
  63
  64                                 return flags != null && Position < flags.Length && flags[Position];
  65                         }
  66
  67                         //
  68                         // Returns true when DynamicAttribute exists
  69                         //
  70                         public bool HasDynamicAttribute (MetadataImporter importer)
  71                         {
  72                                 if (provider != null)
  73                                         ReadAttribute (importer);
  74
  75                                 return flags != null;
  76                         }
  77
  78                         void ReadAttribute (MetadataImporter importer)
  79                         {
  80                                 IList<CustomAttributeData> cad;
  81                                 if (provider is MemberInfo) {
  82                                         cad = CustomAttributeData.GetCustomAttributes ((MemberInfo) provider);
  83                                 } else if (provider is ParameterInfo) {
  84                                         cad = CustomAttributeData.GetCustomAttributes ((ParameterInfo) provider);
  85                                 } else {
  86                                         provider = null;
  87                                         return;
  88                                 }
  89
  90                                 if (cad.Count > 0) {
  91                                         foreach (var ca in cad) {
  92                                                 var dt = ca.Constructor.DeclaringType;
  93                                                 if (dt.Name != "DynamicAttribute" || dt.Namespace != CompilerServicesNamespace)
  94                                                         continue;
  95
  96                                                 if (ca.ConstructorArguments.Count == 0) {
  97                                                         flags = single_attribute;
  98                                                         break;
  99                                                 }
 100
 101                                                 var arg_type = ca.ConstructorArguments[0].ArgumentType;
 102
 103                                                 if (arg_type.IsArray && MetaType.GetTypeCode (arg_type.GetElementType ()) == TypeCode.Boolean) {
 104                                                         var carg = (IList<CustomAttributeTypedArgument>) ca.ConstructorArguments[0].Value;
 105                                                         flags = new bool[carg.Count];
 106                                                         for (int i = 0; i < flags.Length; ++i) {
 107                                                                 if (MetaType.GetTypeCode (carg[i].ArgumentType) == TypeCode.Boolean)
 108                                                                         flags[i] = (bool) carg[i].Value;
 109                                                         }
 110
 111                                                         break;
 112                                                 }
 113                                         }
 114                                 }
 115
 116                                 provider = null;
 117                         }
 118                 }
 119
 120                 protected readonly Dictionary<MetaType, TypeSpec> import_cache;
 121                 protected readonly Dictionary<MetaType, TypeSpec> compiled_types;
 122                 protected readonly Dictionary<Assembly, IAssemblyDefinition> assembly_2_definition;
 123                 protected readonly ModuleContainer module;
 124
 125                 public static readonly string CompilerServicesNamespace = "System.Runtime.CompilerServices";
 126
 127                 protected MetadataImporter (ModuleContainer module)
 128                 {
 129                         this.module = module;
 130
 131                         import_cache = new Dictionary<MetaType, TypeSpec> (1024, ReferenceEquality<MetaType>.Default);
 132                         compiled_types = new Dictionary<MetaType, TypeSpec> (40, ReferenceEquality<MetaType>.Default);
 133                         assembly_2_definition = new Dictionary<Assembly, IAssemblyDefinition> (ReferenceEquality<Assembly>.Default);
 134                         IgnorePrivateMembers = true;
 135                 }
 136
 137                 #region Properties
 138
 139                 public ICollection<IAssemblyDefinition> Assemblies {
 140                         get {
 141                                 return assembly_2_definition.Values;
 142                         }
 143                 }
 144
 145                 public bool IgnorePrivateMembers { get; set; }
 146
 147                 #endregion
 148
 149                 public abstract void AddCompiledType (TypeBuilder builder, TypeSpec spec);
 150                 protected abstract MemberKind DetermineKindFromBaseType (MetaType baseType);
 151                 protected abstract bool HasVolatileModifier (MetaType[] modifiers);
 152
 153                 public FieldSpec CreateField (FieldInfo fi, TypeSpec declaringType)
 154                 {
 155                         Modifiers mod;
 156                         var fa = fi.Attributes;
 157                         switch (fa & FieldAttributes.FieldAccessMask) {
 158                                 case FieldAttributes.Public:
 159                                         mod = Modifiers.PUBLIC;
 160                                         break;
 161                                 case FieldAttributes.Assembly:
 162                                         mod = Modifiers.INTERNAL;
 163                                         break;
 164                                 case FieldAttributes.Family:
 165                                         mod = Modifiers.PROTECTED;
 166                                         break;
 167                                 case FieldAttributes.FamORAssem:
 168                                         mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 169                                         break;
 170                                 default:
 171                                         // Ignore private fields (even for error reporting) to not require extra dependencies
 172                                         if ((IgnorePrivateMembers && !declaringType.IsStruct) ||
 173                                                 HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "CompilerGeneratedAttribute", CompilerServicesNamespace))
 174                                                 return null;
 175
 176                                         mod = Modifiers.PRIVATE;
 177                                         break;
 178                         }
 179
 180                         TypeSpec field_type;
 181
 182                         try {
 183                                 field_type = ImportType (fi.FieldType, new DynamicTypeReader (fi));
 184                         } catch (Exception e) {
 185                                 // TODO: I should construct fake TypeSpec based on TypeRef signature
 186                                 // but there is no way to do it with System.Reflection
 187                                 throw new InternalErrorException (e, "Cannot import field `{0}.{1}' referenced in assembly `{2}'",
 188                                         declaringType.GetSignatureForError (), fi.Name, declaringType.MemberDefinition.DeclaringAssembly);
 189                         }
 190
 191                         var definition = new ImportedMemberDefinition (fi, field_type, this);
 192
 193                         if ((fa & FieldAttributes.Literal) != 0) {
 194                                 Constant c = field_type.Kind == MemberKind.MissingType ?
 195                                         new NullConstant (InternalType.ErrorType, Location.Null) :
 196                                         Constant.CreateConstantFromValue (field_type, fi.GetRawConstantValue (), Location.Null);
 197                                 return new ConstSpec (declaringType, definition, field_type, fi, mod, c);
 198                         }
 199
 200                         if ((fa & FieldAttributes.InitOnly) != 0) {
 201                                 if (field_type.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 202                                         var dc = ReadDecimalConstant (CustomAttributeData.GetCustomAttributes (fi));
 203                                         if (dc != null)
 204                                                 return new ConstSpec (declaringType, definition, field_type, fi, mod, dc);
 205                                 }
 206
 207                                 mod |= Modifiers.READONLY;
 208                         } else {
 209                                 var req_mod = fi.GetRequiredCustomModifiers ();
 210                                 if (req_mod.Length > 0 && HasVolatileModifier (req_mod))
 211                                         mod |= Modifiers.VOLATILE;
 212                         }
 213
 214                         if ((fa & FieldAttributes.Static) != 0) {
 215                                 mod |= Modifiers.STATIC;
 216                         } else {
 217                                 // Fixed buffers cannot be static
 218                                 if (declaringType.IsStruct && field_type.IsStruct && field_type.IsNested &&
 219                                         HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "FixedBufferAttribute", CompilerServicesNamespace)) {
 220
 221                                         // TODO: Sanity check on field_type (only few types are allowed)
 222                                         var element_field = CreateField (fi.FieldType.GetField (FixedField.FixedElementName), declaringType);
 223                                         return new FixedFieldSpec (module, declaringType, definition, fi, element_field, mod);
 224                                 }
 225                         }
 226
 227                         return new FieldSpec (declaringType, definition, field_type, fi, mod);
 228                 }
 229
 230                 public EventSpec CreateEvent (EventInfo ei, TypeSpec declaringType, MethodSpec add, MethodSpec remove)
 231                 {
 232                         add.IsAccessor = true;
 233                         remove.IsAccessor = true;
 234
 235                         if (add.Modifiers != remove.Modifiers)
 236                                 throw new NotImplementedException ("Different accessor modifiers " + ei.Name);
 237
 238                         var event_type = ImportType (ei.EventHandlerType, new DynamicTypeReader (ei));
 239                         var definition = new ImportedMemberDefinition (ei, event_type,  this);
 240                         return new EventSpec (declaringType, definition, event_type, add.Modifiers, add, remove);
 241                 }
 242
 243                 TypeParameterSpec[] CreateGenericParameters (MetaType type, TypeSpec declaringType)
 244                 {
 245                         var tparams = type.GetGenericArguments ();
 246
 247                         int parent_owned_count;
 248                         if (type.IsNested) {
 249                                 parent_owned_count = type.DeclaringType.GetGenericArguments ().Length;
 250
 251                                 //
 252                                 // System.Reflection duplicates parent type parameters for each
 253                                 // nested type with slightly modified properties (eg. different owner)
 254                                 // This just makes things more complicated (think of cloned constraints)
 255                                 // therefore we remap any nested type owned by parent using `type_cache'
 256                                 // to the single TypeParameterSpec
 257                                 //
 258                                 if (declaringType != null && parent_owned_count > 0) {
 259                                         int read_count = 0;
 260                                         while (read_count != parent_owned_count) {
 261                                                 var tparams_count = declaringType.Arity;
 262                                                 if (tparams_count != 0) {
 263                                                         var parent_tp = declaringType.MemberDefinition.TypeParameters;
 264                                                         read_count += tparams_count;
 265                                                         for (int i = 0; i < tparams_count; i++) {
 266                                                                 import_cache.Add (tparams[parent_owned_count - read_count + i], parent_tp[i]);
 267                                                         }
 268                                                 }
 269
 270                                                 declaringType = declaringType.DeclaringType;
 271                                         }
 272                                 }
 273                         } else {
 274                                 parent_owned_count = 0;
 275                         }
 276
 277                         if (tparams.Length - parent_owned_count == 0)
 278                                 return null;
 279
 280                         return CreateGenericParameters (parent_owned_count, tparams);
 281                 }
 282
 283                 TypeParameterSpec[] CreateGenericParameters (int first, MetaType[] tparams)
 284                 {
 285                         var tspec = new TypeParameterSpec[tparams.Length - first];
 286                         for (int pos = first; pos < tparams.Length; ++pos) {
 287                                 var type = tparams[pos];
 288                                 int index = pos - first;
 289
 290                                 tspec[index] = (TypeParameterSpec) CreateType (type, new DynamicTypeReader (), false);
 291                         }
 292
 293                         return tspec;
 294                 }
 295
 296                 TypeSpec[] CreateGenericArguments (int first, MetaType[] tparams, DynamicTypeReader dtype)
 297                 {
 298                         ++dtype.Position;
 299
 300                         var tspec = new TypeSpec [tparams.Length - first];
 301                         for (int pos = first; pos < tparams.Length; ++pos) {
 302                                 var type = tparams[pos];
 303                                 int index = pos - first;
 304
 305                                 TypeSpec spec;
 306                                 if (type.HasElementType) {
 307                                         var element = type.GetElementType ();
 308                                         ++dtype.Position;
 309                                         spec = ImportType (element, dtype);
 310
 311                                         if (!type.IsArray) {
 312                                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
 313                                         }
 314
 315                                         spec = ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
 316                                 } else {
 317                                         spec = CreateType (type, dtype, true);
 318
 319                                         //
 320                                         // We treat nested generic types as inflated internally where
 321                                         // reflection uses type definition
 322                                         //
 323                                         // class A<T> {
 324                                         //    IFoo<A<T>> foo;   // A<T> is definition in this case
 325                                         // }
 326                                         //
 327                                         if (!IsMissingType (type) && type.IsGenericTypeDefinition) {
 328                                                 var start_pos = spec.DeclaringType == null ? 0 : spec.DeclaringType.MemberDefinition.TypeParametersCount;
 329                                                 var targs = CreateGenericArguments (start_pos, type.GetGenericArguments (), dtype);
 330                                                 spec = spec.MakeGenericType (module, targs);
 331                                         }
 332                                 }
 333
 334                                 ++dtype.Position;
 335                                 tspec[index] = spec;
 336                         }
 337
 338                         return tspec;
 339                 }
 340
 341                 public MethodSpec CreateMethod (MethodBase mb, TypeSpec declaringType)
 342                 {
 343                         Modifiers mod = ReadMethodModifiers (mb, declaringType);
 344                         TypeParameterSpec[] tparams;
 345
 346                         var parameters = CreateParameters (declaringType, mb.GetParameters (), mb);
 347
 348                         if (mb.IsGenericMethod) {
 349                                 if (!mb.IsGenericMethodDefinition)
 350                                         throw new NotSupportedException ("assert");
 351
 352                                 tparams = CreateGenericParameters (0, mb.GetGenericArguments ());
 353                         } else {
 354                                 tparams = null;
 355                         }
 356
 357                         MemberKind kind;
 358                         TypeSpec returnType;
 359                         if (mb.MemberType == MemberTypes.Constructor) {
 360                                 kind = MemberKind.Constructor;
 361                                 returnType = module.Compiler.BuiltinTypes.Void;
 362                         } else {
 363                                 //
 364                                 // Detect operators and destructors
 365                                 //
 366                                 string name = mb.Name;
 367                                 kind = MemberKind.Method;
 368                                 if (tparams == null && !mb.DeclaringType.IsInterface && name.Length > 6) {
 369                                         if ((mod & (Modifiers.STATIC | Modifiers.PUBLIC)) == (Modifiers.STATIC | Modifiers.PUBLIC)) {
 370                                                 if (name[2] == '_' && name[1] == 'p' && name[0] == 'o') {
 371                                                         var op_type = Operator.GetType (name);
 372                                                         if (op_type.HasValue && parameters.Count > 0 && parameters.Count < 3) {
 373                                                                 kind = MemberKind.Operator;
 374                                                         }
 375                                                 }
 376                                         } else if (parameters.IsEmpty && name == Destructor.MetadataName) {
 377                                                 kind = MemberKind.Destructor;
 378                                                 if (declaringType.BuiltinType == BuiltinTypeSpec.Type.Object) {
 379                                                         mod &= ~Modifiers.OVERRIDE;
 380                                                         mod |= Modifiers.VIRTUAL;
 381                                                 }
 382                                         }
 383                                 }
 384
 385                                 var mi = (MethodInfo) mb;
 386                                 returnType = ImportType (mi.ReturnType, new DynamicTypeReader (mi.ReturnParameter));
 387
 388                                 // Cannot set to OVERRIDE without full hierarchy checks
 389                                 // this flag indicates that the method could be override
 390                                 // but further validation is needed
 391                                 if ((mod & Modifiers.OVERRIDE) != 0) {
 392                                         bool is_real_override = false;
 393                                         if (kind == MemberKind.Method && declaringType.BaseType != null) {
 394                                                 var btype = declaringType.BaseType;
 395                                                 if (IsOverrideMethodBaseTypeAccessible (btype)) {
 396                                                         var filter = MemberFilter.Method (name, tparams != null ? tparams.Length : 0, parameters, null);
 397                                                         var candidate = MemberCache.FindMember (btype, filter, BindingRestriction.None);
 398
 399                                                         //
 400                                                         // For imported class method do additional validation to be sure that metadata
 401                                                         // override flag was correct
 402                                                         //
 403                                                         // Difference between protected internal and protected is ok
 404                                                         //
 405                                                         const Modifiers conflict_mask = Modifiers.AccessibilityMask & ~Modifiers.INTERNAL;
 406                                                         if (candidate != null && (candidate.Modifiers & conflict_mask) == (mod & conflict_mask) && !candidate.IsStatic) {
 407                                                                 is_real_override = true;
 408                                                         }
 409                                                 }
 410                                         }
 411
 412                                         if (!is_real_override) {
 413                                                 mod &= ~Modifiers.OVERRIDE;
 414                                                 if ((mod & Modifiers.SEALED) != 0)
 415                                                         mod &= ~Modifiers.SEALED;
 416                                                 else
 417                                                         mod |= Modifiers.VIRTUAL;
 418                                         }
 419                                 }
 420                         }
 421
 422                         IMethodDefinition definition;
 423                         if (tparams != null) {
 424                                 var gmd = new ImportedGenericMethodDefinition ((MethodInfo) mb, returnType, parameters, tparams, this);
 425                                 foreach (var tp in gmd.TypeParameters) {
 426                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
 427                                 }
 428
 429                                 definition = gmd;
 430                         } else {
 431                                 definition = new ImportedMethodDefinition (mb, returnType, parameters, this);
 432                         }
 433
 434                         MethodSpec ms = new MethodSpec (kind, declaringType, definition, returnType, parameters, mod);
 435                         if (tparams != null)
 436                                 ms.IsGeneric = true;
 437
 438                         return ms;
 439                 }
 440
 441                 bool IsOverrideMethodBaseTypeAccessible (TypeSpec baseType)
 442                 {
 443                         switch (baseType.Modifiers & Modifiers.AccessibilityMask) {
 444                         case Modifiers.PUBLIC:
 445                                 return true;
 446                         case Modifiers.INTERNAL:
 447                                 //
 448                                 // Check whether imported method in base type is accessible from compiled
 449                                 // context
 450                                 //
 451                                 return baseType.MemberDefinition.IsInternalAsPublic (module.DeclaringAssembly);
 452                         case Modifiers.PRIVATE:
 453                                 return false;
 454                         default:
 455                                 // protected
 456                                 // protected internal
 457                                 //
 458                                 // Method accessibility checks will be done later based on context
 459                                 // where the method is called (CS0122 error will be reported for inaccessible)
 460                                 //
 461                                 return true;
 462                         }
 463                 }
 464
 465                 //
 466                 // Imports System.Reflection parameters
 467                 //
 468                 AParametersCollection CreateParameters (TypeSpec parent, ParameterInfo[] pi, MethodBase method)
 469                 {
 470                         int varargs = method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0 ? 1 : 0;
 471
 472                         if (pi.Length == 0 && varargs == 0)
 473                                 return ParametersCompiled.EmptyReadOnlyParameters;
 474
 475                         TypeSpec[] types = new TypeSpec[pi.Length + varargs];
 476                         IParameterData[] par = new IParameterData[pi.Length + varargs];
 477                         bool is_params = false;
 478                         for (int i = 0; i < pi.Length; i++) {
 479                                 ParameterInfo p = pi[i];
 480                                 Parameter.Modifier mod = 0;
 481                                 Expression default_value = null;
 482                                 if (p.ParameterType.IsByRef) {
 483                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 484                                                 mod = Parameter.Modifier.OUT;
 485                                         else
 486                                                 mod = Parameter.Modifier.REF;
 487
 488                                         //
 489                                         // Strip reference wrapping
 490                                         //
 491                                         var el = p.ParameterType.GetElementType ();
 492                                         types[i] = ImportType (el, new DynamicTypeReader (p));  // TODO: 1-based positio to be csc compatible
 493                                 } else if (i == 0 && method.IsStatic && (parent.Modifiers & Modifiers.METHOD_EXTENSION) != 0 &&
 494                                         HasAttribute (CustomAttributeData.GetCustomAttributes (method), "ExtensionAttribute", CompilerServicesNamespace)) {
 495                                         mod = Parameter.Modifier.This;
 496                                         types[i] = ImportType (p.ParameterType);
 497                                 } else {
 498                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 499
 500                                         if (i >= pi.Length - 2 && types[i] is ArrayContainer) {
 501                                                 if (HasAttribute (CustomAttributeData.GetCustomAttributes (p), "ParamArrayAttribute", "System")) {
 502                                                         mod = Parameter.Modifier.PARAMS;
 503                                                         is_params = true;
 504                                                 }
 505                                         }
 506
 507                                         if (!is_params && p.IsOptional) {
 508                                                 object value = p.RawDefaultValue;
 509                                                 var ptype = types[i];
 510                                                 if ((p.Attributes & ParameterAttributes.HasDefault) != 0 && ptype.Kind != MemberKind.TypeParameter && (value != null || TypeSpec.IsReferenceType (ptype))) {
 511                                                         if (value == null) {
 512                                                                 default_value = Constant.CreateConstantFromValue (ptype, null, Location.Null);
 513                                                         } else {
 514                                                                 default_value = ImportParameterConstant (value);
 515
 516                                                                 if (ptype.IsEnum) {
 517                                                                         default_value = new EnumConstant ((Constant) default_value, ptype);
 518                                                                 }
 519                                                         }
 520
 521                                                         var attrs = CustomAttributeData.GetCustomAttributes (p);
 522                                                         for (int ii = 0; ii < attrs.Count; ++ii) {
 523                                                                 var attr = attrs[ii];
 524                                                                 var dt = attr.Constructor.DeclaringType;
 525                                                                 if (dt.Namespace != CompilerServicesNamespace)
 526                                                                         continue;
 527
 528                                                                 if (dt.Name == "CallerLineNumberAttribute" && (ptype.BuiltinType == BuiltinTypeSpec.Type.Int || Convert.ImplicitNumericConversionExists (module.Compiler.BuiltinTypes.Int, ptype)))
 529                                                                         mod |= Parameter.Modifier.CallerLineNumber;
 530                                                                 else if (dt.Name == "CallerFilePathAttribute" && Convert.ImplicitReferenceConversionExists (module.Compiler.BuiltinTypes.String, ptype))
 531                                                                         mod |= Parameter.Modifier.CallerFilePath;
 532                                                                 else if (dt.Name == "CallerMemberNameAttribute" && Convert.ImplicitReferenceConversionExists (module.Compiler.BuiltinTypes.String, ptype))
 533                                                                         mod |= Parameter.Modifier.CallerMemberName;
 534                                                         }
 535                                                 } else if (value == Missing.Value) {
 536                                                         default_value = EmptyExpression.MissingValue;
 537                                                 } else if (value == null) {
 538                                                         default_value = new DefaultValueExpression (new TypeExpression (ptype, Location.Null), Location.Null);
 539                                                 } else if (ptype.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 540                                                         default_value = ImportParameterConstant (value);
 541                                                 }
 542                                         }
 543                                 }
 544
 545                                 par[i] = new ParameterData (p.Name, mod, default_value);
 546                         }
 547
 548                         if (varargs != 0) {
 549                                 par[par.Length - 1] = new ArglistParameter (Location.Null);
 550                                 types[types.Length - 1] = InternalType.Arglist;
 551                         }
 552
 553                         return method != null ?
 554                                 new ParametersImported (par, types, varargs != 0, is_params) :
 555                                 new ParametersImported (par, types, is_params);
 556                 }
 557
 558                 //
 559                 // Returns null when the property is not valid C# property
 560                 //
 561                 public PropertySpec CreateProperty (PropertyInfo pi, TypeSpec declaringType, MethodSpec get, MethodSpec set)
 562                 {
 563                         Modifiers mod = 0;
 564                         AParametersCollection param = null;
 565                         TypeSpec type = null;
 566                         if (get != null) {
 567                                 mod = get.Modifiers;
 568                                 param = get.Parameters;
 569                                 type = get.ReturnType;
 570                         }
 571
 572                         bool is_valid_property = true;
 573                         if (set != null) {
 574                                 if (set.ReturnType.Kind != MemberKind.Void)
 575                                         is_valid_property = false;
 576
 577                                 var set_param_count = set.Parameters.Count - 1;
 578
 579                                 if (set_param_count < 0) {
 580                                         set_param_count = 0;
 581                                         is_valid_property = false;
 582                                 }
 583
 584                                 var set_type = set.Parameters.Types[set_param_count];
 585
 586                                 if (mod == 0) {
 587                                         AParametersCollection set_based_param;
 588
 589                                         if (set_param_count == 0) {
 590                                                 set_based_param = ParametersCompiled.EmptyReadOnlyParameters;
 591                                         } else {
 592                                                 //
 593                                                 // Create indexer parameters based on setter method parameters (the last parameter has to be removed)
 594                                                 //
 595                                                 var data = new IParameterData[set_param_count];
 596                                                 var types = new TypeSpec[set_param_count];
 597                                                 Array.Copy (set.Parameters.FixedParameters, data, set_param_count);
 598                                                 Array.Copy (set.Parameters.Types, types, set_param_count);
 599                                                 set_based_param = new ParametersImported (data, types, set.Parameters.HasParams);
 600                                         }
 601
 602                                         mod = set.Modifiers;
 603                                         param = set_based_param;
 604                                         type = set_type;
 605                                 } else {
 606                                         if (set_param_count != get.Parameters.Count)
 607                                                 is_valid_property = false;
 608
 609                                         if (get.ReturnType != set_type)
 610                                                 is_valid_property = false;
 611
 612                                         // Possible custom accessor modifiers
 613                                         if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
 614                                                 var get_acc = mod & Modifiers.AccessibilityMask;
 615                                                 if (get_acc != Modifiers.PUBLIC) {
 616                                                         var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
 617                                                         // If the accessor modifiers are not same, do extra restriction checks
 618                                                         if (get_acc != set_acc) {
 619                                                                 var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
 620                                                                 var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
 621                                                                 if (get_restr && set_restr) {
 622                                                                         is_valid_property = false; // Neither is more restrictive
 623                                                                 }
 624
 625                                                                 if (get_restr) {
 626                                                                         mod &= ~Modifiers.AccessibilityMask;
 627                                                                         mod |= set_acc;
 628                                                                 }
 629                                                         }
 630                                                 }
 631                                         }
 632                                 }
 633                         }
 634
 635                         PropertySpec spec = null;
 636                         if (!param.IsEmpty) {
 637                                 if (is_valid_property) {
 638                                         var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
 639                                         if (index_name == null) {
 640                                                 is_valid_property = false;
 641                                         } else {
 642                                                 if (get != null) {
 643                                                         if (get.IsStatic)
 644                                                                 is_valid_property = false;
 645                                                         if (get.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 646                                                                 is_valid_property = false;
 647                                                 }
 648                                                 if (set != null) {
 649                                                         if (set.IsStatic)
 650                                                                 is_valid_property = false;
 651                                                         if (set.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 652                                                                 is_valid_property = false;
 653                                                 }
 654                                         }
 655
 656                                         if (is_valid_property) {
 657                                                 spec = new IndexerSpec (declaringType, new ImportedParameterMemberDefinition (pi, type, param, this), type, param, pi, mod);
 658                                         } else if (declaringType.MemberDefinition.IsComImport && param.FixedParameters[0].HasDefaultValue) {
 659                                                 //
 660                                                 // Enables support for properties with parameters (must have default value) of COM-imported types
 661                                                 //
 662                                                 is_valid_property = true;
 663
 664                                                 for (int i = 0; i < param.FixedParameters.Length; ++i) {
 665                                                         if (!param.FixedParameters[i].HasDefaultValue) {
 666                                                                 is_valid_property = false;
 667                                                                 break;
 668                                                         }
 669                                                 }
 670                                         }
 671                                 }
 672                         }
 673
 674                         if (spec == null)
 675                                 spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi, type, this), type, pi, mod);
 676
 677                         if (!is_valid_property) {
 678                                 spec.IsNotCSharpCompatible = true;
 679                                 return spec;
 680                         }
 681
 682                         if (set != null)
 683                                 spec.Set = set;
 684                         if (get != null)
 685                                 spec.Get = get;
 686
 687                         return spec;
 688                 }
 689
 690                 public TypeSpec CreateType (MetaType type)
 691                 {
 692                         return CreateType (type, new DynamicTypeReader (), true);
 693                 }
 694
 695                 public TypeSpec CreateNestedType (MetaType type, TypeSpec declaringType)
 696                 {
 697                         return CreateType (type, declaringType, new DynamicTypeReader (type), false);
 698                 }
 699
 700                 TypeSpec CreateType (MetaType type, DynamicTypeReader dtype, bool canImportBaseType)
 701                 {
 702                         TypeSpec declaring_type;
 703                         if (type.IsNested && !type.IsGenericParameter)
 704                                 declaring_type = CreateType (type.DeclaringType, new DynamicTypeReader (type.DeclaringType), true);
 705                         else
 706                                 declaring_type = null;
 707
 708                         return CreateType (type, declaring_type, dtype, canImportBaseType);
 709                 }
 710
 711                 protected TypeSpec CreateType (MetaType type, TypeSpec declaringType, DynamicTypeReader dtype, bool canImportBaseType)
 712                 {
 713                         TypeSpec spec;
 714                         if (import_cache.TryGetValue (type, out spec)) {
 715                                 if (spec.BuiltinType == BuiltinTypeSpec.Type.Object) {
 716                                         if (dtype.IsDynamicObject (this))
 717                                                 return module.Compiler.BuiltinTypes.Dynamic;
 718
 719                                         return spec;
 720                                 }
 721
 722                                 if (!spec.IsGeneric || type.IsGenericTypeDefinition)
 723                                         return spec;
 724
 725                                 if (!dtype.HasDynamicAttribute (this))
 726                                         return spec;
 727
 728                                 // We've found same object in the cache but this one has a dynamic custom attribute
 729                                 // and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
 730                                 // Do type resolve process again in that case
 731
 732                                 // TODO: Handle cases where they still unify
 733                         }
 734
 735                         if (IsMissingType (type)) {
 736                                 spec = new TypeSpec (MemberKind.MissingType, declaringType, new ImportedTypeDefinition (type, this), type, Modifiers.PUBLIC);
 737                                 spec.MemberCache = MemberCache.Empty;
 738                                 import_cache.Add (type, spec);
 739                                 return spec;
 740                         }
 741
 742                         if (type.IsGenericType && !type.IsGenericTypeDefinition) {
 743                                 var type_def = type.GetGenericTypeDefinition ();
 744
 745                                 // Generic type definition can also be forwarded
 746                                 if (compiled_types.TryGetValue (type_def, out spec))
 747                                         return spec;
 748
 749                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 750                                 if (declaringType == null) {
 751                                         // Simple case, no nesting
 752                                         spec = CreateType (type_def, null, new DynamicTypeReader (), canImportBaseType);
 753                                         spec = spec.MakeGenericType (module, targs);
 754                                 } else {
 755                                         //
 756                                         // Nested type case, converting .NET types like
 757                                         // A`1.B`1.C`1<int, long, string> to typespec like
 758                                         // A<int>.B<long>.C<string>
 759                                         //
 760                                         var nested_hierarchy = new List<TypeSpec> ();
 761                                         while (declaringType.IsNested) {
 762                                                 nested_hierarchy.Add (declaringType);
 763                                                 declaringType = declaringType.DeclaringType;
 764                                         }
 765
 766                                         int targs_pos = 0;
 767                                         if (declaringType.Arity > 0) {
 768                                                 spec = declaringType.MakeGenericType (module, targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
 769                                                 targs_pos = spec.Arity;
 770                                         } else {
 771                                                 spec = declaringType;
 772                                         }
 773
 774                                         for (int i = nested_hierarchy.Count; i != 0; --i) {
 775                                                 var t = nested_hierarchy [i - 1];
 776                                                 if (t.Kind == MemberKind.MissingType)
 777                                                         spec = t;
 778                                                 else
 779                                                         spec = MemberCache.FindNestedType (spec, t.Name, t.Arity);
 780
 781                                                 if (t.Arity > 0) {
 782                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
 783                                                         targs_pos += t.Arity;
 784                                                 }
 785                                         }
 786
 787                                         if (spec.Kind == MemberKind.MissingType) {
 788                                                 spec = new TypeSpec (MemberKind.MissingType, spec, new ImportedTypeDefinition (type_def, this), type_def, Modifiers.PUBLIC);
 789                                                 spec.MemberCache = MemberCache.Empty;
 790                                         } else {
 791                                                 if ((type_def.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && IgnorePrivateMembers)
 792                                                         return null;
 793
 794                                                 string name = type.Name;
 795                                                 int index = name.IndexOf ('`');
 796                                                 if (index > 0)
 797                                                         name = name.Substring (0, index);
 798
 799                                                 spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos);
 800
 801                                                 if (spec.Arity > 0) {
 802                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).ToArray ());
 803                                                 }
 804                                         }
 805                                 }
 806
 807                                 // Don't add generic type with dynamic arguments, they can interfere with same type
 808                                 // using object type arguments
 809                                 if (!spec.HasDynamicElement) {
 810
 811                                         // Add to reading cache to speed up reading
 812                                         if (!import_cache.ContainsKey (type))
 813                                                 import_cache.Add (type, spec);
 814                                 }
 815
 816                                 return spec;
 817                         }
 818
 819                         Modifiers mod;
 820                         MemberKind kind;
 821
 822                         var ma = type.Attributes;
 823                         switch (ma & TypeAttributes.VisibilityMask) {
 824                         case TypeAttributes.Public:
 825                         case TypeAttributes.NestedPublic:
 826                                 mod = Modifiers.PUBLIC;
 827                                 break;
 828                         case TypeAttributes.NestedPrivate:
 829                                 mod = Modifiers.PRIVATE;
 830                                 break;
 831                         case TypeAttributes.NestedFamily:
 832                                 mod = Modifiers.PROTECTED;
 833                                 break;
 834                         case TypeAttributes.NestedFamORAssem:
 835                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 836                                 break;
 837                         default:
 838                                 mod = Modifiers.INTERNAL;
 839                                 break;
 840                         }
 841
 842                         if ((ma & TypeAttributes.Interface) != 0) {
 843                                 kind = MemberKind.Interface;
 844                         } else if (type.IsGenericParameter) {
 845                                 kind = MemberKind.TypeParameter;
 846                         } else {
 847                                 var base_type = type.BaseType;
 848                                 if (base_type == null || (ma & TypeAttributes.Abstract) != 0) {
 849                                         kind = MemberKind.Class;
 850                                 } else {
 851                                         kind = DetermineKindFromBaseType (base_type);
 852                                         if (kind == MemberKind.Struct || kind == MemberKind.Delegate) {
 853                                                 mod |= Modifiers.SEALED;
 854                                         }
 855                                 }
 856
 857                                 if (kind == MemberKind.Class) {
 858                                         if ((ma & TypeAttributes.Sealed) != 0) {
 859                                                 mod |= Modifiers.SEALED;
 860                                                 if ((ma & TypeAttributes.Abstract) != 0)
 861                                                         mod |= Modifiers.STATIC;
 862                                         } else if ((ma & TypeAttributes.Abstract) != 0) {
 863                                                 mod |= Modifiers.ABSTRACT;
 864                                         }
 865                                 }
 866                         }
 867
 868                         var definition = new ImportedTypeDefinition (type, this);
 869                         TypeSpec pt;
 870
 871                         if (kind == MemberKind.Enum) {
 872                                 const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
 873                                         BindingFlags.Instance |
 874                                         BindingFlags.Public | BindingFlags.NonPublic;
 875
 876                                 var type_members = type.GetFields (underlying_member);
 877                                 foreach (var type_member in type_members) {
 878                                         spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
 879                                         break;
 880                                 }
 881
 882                                 if (spec == null)
 883                                         kind = MemberKind.Class;
 884
 885                         } else if (kind == MemberKind.TypeParameter) {
 886                                 spec = CreateTypeParameter (type, declaringType);
 887                         } else if (type.IsGenericTypeDefinition) {
 888                                 definition.TypeParameters = CreateGenericParameters (type, declaringType);
 889                         } else if (compiled_types.TryGetValue (type, out pt)) {
 890                                 //
 891                                 // Same type was found in inside compiled types. It's
 892                                 // either build-in type or forward referenced typed
 893                                 // which point into just compiled assembly.
 894                                 //
 895                                 spec = pt;
 896                                 BuiltinTypeSpec bts = pt as BuiltinTypeSpec;
 897                                 if (bts != null)
 898                                         bts.SetDefinition (definition, type, mod);
 899                         }
 900
 901                         if (spec == null)
 902                                 spec = new TypeSpec (kind, declaringType, definition, type, mod);
 903
 904                         import_cache.Add (type, spec);
 905
 906                         if (kind == MemberKind.TypeParameter) {
 907                                 if (canImportBaseType)
 908                                         ImportTypeParameterTypeConstraints ((TypeParameterSpec) spec, type);
 909
 910                                 return spec;
 911                         }
 912
 913                         //
 914                         // Two stage setup as the base type can be inflated declaring type or
 915                         // another nested type inside same declaring type which has not been
 916                         // loaded, therefore we can import a base type of nested types once
 917                         // the types have been imported
 918                         //
 919                         if (canImportBaseType)
 920                                 ImportTypeBase (spec, type);
 921
 922                         return spec;
 923                 }
 924
 925                 public IAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
 926                 {
 927                         IAssemblyDefinition found;
 928                         if (!assembly_2_definition.TryGetValue (assembly, out found)) {
 929
 930                                 // This can happen in dynamic context only
 931                                 var def = new ImportedAssemblyDefinition (assembly);
 932                                 assembly_2_definition.Add (assembly, def);
 933                                 def.ReadAttributes ();
 934                                 found = def;
 935                         }
 936
 937                         return found;
 938                 }
 939
 940                 public void ImportTypeBase (MetaType type)
 941                 {
 942                         TypeSpec spec = import_cache[type];
 943                         if (spec != null)
 944                                 ImportTypeBase (spec, type);
 945                 }
 946
 947                 TypeParameterSpec CreateTypeParameter (MetaType type, TypeSpec declaringType)
 948                 {
 949                         Variance variance;
 950                         switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
 951                         case GenericParameterAttributes.Covariant:
 952                                 variance = Variance.Covariant;
 953                                 break;
 954                         case GenericParameterAttributes.Contravariant:
 955                                 variance = Variance.Contravariant;
 956                                 break;
 957                         default:
 958                                 variance = Variance.None;
 959                                 break;
 960                         }
 961
 962                         SpecialConstraint special = SpecialConstraint.None;
 963                         var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
 964
 965                         if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
 966                                 special |= SpecialConstraint.Struct;
 967                         } else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
 968                                 special = SpecialConstraint.Constructor;
 969                         }
 970
 971                         if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
 972                                 special |= SpecialConstraint.Class;
 973                         }
 974
 975                         TypeParameterSpec spec;
 976                         var def = new ImportedTypeParameterDefinition (type, this);
 977                         if (type.DeclaringMethod != null) {
 978                                 spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
 979                         } else {
 980                                 spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
 981                         }
 982
 983                         return spec;
 984                 }
 985
 986                 //
 987                 // Test for a custom attribute type match. Custom attributes are not really predefined globaly
 988                 // they can be assembly specific therefore we do check based on names only
 989                 //
 990                 public static bool HasAttribute (IList<CustomAttributeData> attributesData, string attrName, string attrNamespace)
 991                 {
 992                         if (attributesData.Count == 0)
 993                                 return false;
 994
 995                         foreach (var attr in attributesData) {
 996                                 var dt = attr.Constructor.DeclaringType;
 997                                 if (dt.Name == attrName && dt.Namespace == attrNamespace)
 998                                         return true;
 999                         }
1000
1001                         return false;
1002                 }
1003
1004                 void ImportTypeBase (TypeSpec spec, MetaType type)
1005                 {
1006                         if (spec.Kind == MemberKind.Interface)
1007                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1008                         else if (type.BaseType != null) {
1009                                 TypeSpec base_type;
1010                                 if (!IsMissingType (type.BaseType) && type.BaseType.IsGenericType)
1011                                         base_type = CreateType (type.BaseType, new DynamicTypeReader (type), true);
1012                                 else
1013                                         base_type = CreateType (type.BaseType);
1014
1015                                 spec.BaseType = base_type;
1016                         }
1017
1018                         if (spec.MemberDefinition.TypeParametersCount > 0) {
1019                                 foreach (var tp in spec.MemberDefinition.TypeParameters) {
1020                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
1021                                 }
1022                         }
1023                 }
1024
1025                 protected void ImportTypes (MetaType[] types, Namespace targetNamespace, bool importExtensionTypes)
1026                 {
1027                         Namespace ns = targetNamespace;
1028                         string prev_namespace = null;
1029                         foreach (var t in types) {
1030                                 if (t == null)
1031                                         continue;
1032
1033                                 // Be careful not to trigger full parent type loading
1034                                 if (t.MemberType == MemberTypes.NestedType)
1035                                         continue;
1036
1037                                 if (t.Name[0] == '<')
1038                                         continue;
1039
1040                                 var it = CreateType (t, null, new DynamicTypeReader (t), true);
1041                                 if (it == null)
1042                                         continue;
1043
1044                                 if (prev_namespace != t.Namespace) {
1045                                         ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
1046                                         prev_namespace = t.Namespace;
1047                                 }
1048
1049                                 // Cannot rely on assembly level Extension attribute or static modifier because they
1050                                 // are not followed by other compilers (e.g. F#).
1051                                 if (it.IsClass && it.Arity == 0 && importExtensionTypes &&
1052                                         HasAttribute (CustomAttributeData.GetCustomAttributes (t), "ExtensionAttribute", CompilerServicesNamespace)) {
1053                                         it.SetExtensionMethodContainer ();
1054                                 }
1055
1056                                 ns.AddType (module, it);
1057                         }
1058                 }
1059
1060                 void ImportTypeParameterTypeConstraints (TypeParameterSpec spec, MetaType type)
1061                 {
1062                         var constraints = type.GetGenericParameterConstraints ();
1063                         List<TypeSpec> tparams = null;
1064                         foreach (var ct in constraints) {
1065                                 if (ct.IsGenericParameter) {
1066                                         if (tparams == null)
1067                                                 tparams = new List<TypeSpec> ();
1068
1069                                         tparams.Add (CreateType (ct));
1070                                         continue;
1071                                 }
1072
1073                                 var constraint_type = CreateType (ct);
1074                                 if (constraint_type.IsClass) {
1075                                         spec.BaseType = constraint_type;
1076                                         continue;
1077                                 }
1078
1079                                 spec.AddInterface (constraint_type);
1080                         }
1081
1082                         if (spec.BaseType == null)
1083                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1084
1085                         if (tparams != null)
1086                                 spec.TypeArguments = tparams.ToArray ();
1087                 }
1088
1089                 Constant ImportParameterConstant (object value)
1090                 {
1091                         //
1092                         // Get type of underlying value as int constant can be used for object
1093                         // parameter type. This is not allowed in C# but other languages can do that
1094                         //
1095                         var types = module.Compiler.BuiltinTypes;
1096                         switch (System.Type.GetTypeCode (value.GetType ())) {
1097                         case TypeCode.Boolean:
1098                                 return new BoolConstant (types, (bool) value, Location.Null);
1099                         case TypeCode.Byte:
1100                                 return new ByteConstant (types, (byte) value, Location.Null);
1101                         case TypeCode.Char:
1102                                 return new CharConstant (types, (char) value, Location.Null);
1103                         case TypeCode.Decimal:
1104                                 return new DecimalConstant (types, (decimal) value, Location.Null);
1105                         case TypeCode.Double:
1106                                 return new DoubleConstant (types, (double) value, Location.Null);
1107                         case TypeCode.Int16:
1108                                 return new ShortConstant (types, (short) value, Location.Null);
1109                         case TypeCode.Int32:
1110                                 return new IntConstant (types, (int) value, Location.Null);
1111                         case TypeCode.Int64:
1112                                 return new LongConstant (types, (long) value, Location.Null);
1113                         case TypeCode.SByte:
1114                                 return new SByteConstant (types, (sbyte) value, Location.Null);
1115                         case TypeCode.Single:
1116                                 return new FloatConstant (types, (float) value, Location.Null);
1117                         case TypeCode.String:
1118                                 return new StringConstant (types, (string) value, Location.Null);
1119                         case TypeCode.UInt16:
1120                                 return new UShortConstant (types, (ushort) value, Location.Null);
1121                         case TypeCode.UInt32:
1122                                 return new UIntConstant (types, (uint) value, Location.Null);
1123                         case TypeCode.UInt64:
1124                                 return new ULongConstant (types, (ulong) value, Location.Null);
1125                         }
1126
1127                         throw new NotImplementedException (value.GetType ().ToString ());
1128                 }
1129
1130                 public TypeSpec ImportType (MetaType type)
1131                 {
1132                         return ImportType (type, new DynamicTypeReader (type));
1133                 }
1134
1135                 TypeSpec ImportType (MetaType type, DynamicTypeReader dtype)
1136                 {
1137                         if (type.HasElementType) {
1138                                 var element = type.GetElementType ();
1139                                 ++dtype.Position;
1140                                 var spec = ImportType (element, dtype);
1141
1142                                 if (type.IsArray)
1143                                         return ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
1144                                 if (type.IsByRef)
1145                                         return ReferenceContainer.MakeType (module, spec);
1146                                 if (type.IsPointer)
1147                                         return PointerContainer.MakeType (module, spec);
1148
1149                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
1150                         }
1151
1152                         return CreateType (type, dtype, true);
1153                 }
1154
1155                 static bool IsMissingType (MetaType type)
1156                 {
1157 #if STATIC
1158                         return type.__IsMissing;
1159 #else
1160                         return false;
1161 #endif
1162                 }
1163
1164                 //
1165                 // Decimal constants cannot be encoded in the constant blob, and thus are marked
1166                 // as IsInitOnly ('readonly' in C# parlance).  We get its value from the
1167                 // DecimalConstantAttribute metadata.
1168                 //
1169                 Constant ReadDecimalConstant (IList<CustomAttributeData> attrs)
1170                 {
1171                         if (attrs.Count == 0)
1172                                 return null;
1173
1174                         foreach (var ca in attrs) {
1175                                 var dt = ca.Constructor.DeclaringType;
1176                                 if (dt.Name != "DecimalConstantAttribute" || dt.Namespace != CompilerServicesNamespace)
1177                                         continue;
1178
1179                                 var value = new decimal (
1180                                         (int) (uint) ca.ConstructorArguments[4].Value,
1181                                         (int) (uint) ca.ConstructorArguments[3].Value,
1182                                         (int) (uint) ca.ConstructorArguments[2].Value,
1183                                         (byte) ca.ConstructorArguments[1].Value != 0,
1184                                         (byte) ca.ConstructorArguments[0].Value);
1185
1186                                 return new DecimalConstant (module.Compiler.BuiltinTypes, value, Location.Null);
1187                         }
1188
1189                         return null;
1190                 }
1191
1192                 static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
1193                 {
1194                         Modifiers mod;
1195                         var ma = mb.Attributes;
1196                         switch (ma & MethodAttributes.MemberAccessMask) {
1197                         case MethodAttributes.Public:
1198                                 mod = Modifiers.PUBLIC;
1199                                 break;
1200                         case MethodAttributes.Assembly:
1201                                 mod = Modifiers.INTERNAL;
1202                                 break;
1203                         case MethodAttributes.Family:
1204                                 mod = Modifiers.PROTECTED;
1205                                 break;
1206                         case MethodAttributes.FamORAssem:
1207                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
1208                                 break;
1209                         default:
1210                                 mod = Modifiers.PRIVATE;
1211                                 break;
1212                         }
1213
1214                         if ((ma & MethodAttributes.Static) != 0) {
1215                                 mod |= Modifiers.STATIC;
1216                                 return mod;
1217                         }
1218                         if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
1219                                 mod |= Modifiers.ABSTRACT;
1220                                 return mod;
1221                         }
1222
1223                         // It can be sealed and override
1224                         if ((ma & MethodAttributes.Final) != 0)
1225                                 mod |= Modifiers.SEALED;
1226
1227                         if ((ma & MethodAttributes.Virtual) != 0) {
1228                                 // Not every member can be detected based on MethodAttribute, we
1229                                 // set virtual or non-virtual only when we are certain. Further checks
1230                                 // to really find out what `virtual' means for this member are done
1231                                 // later
1232                                 if ((ma & MethodAttributes.NewSlot) != 0) {
1233                                         if ((mod & Modifiers.SEALED) != 0) {
1234                                                 mod &= ~Modifiers.SEALED;
1235                                         } else {
1236                                                 mod |= Modifiers.VIRTUAL;
1237                                         }
1238                                 } else {
1239                                         mod |= Modifiers.OVERRIDE;
1240                                 }
1241                         }
1242
1243                         return mod;
1244                 }
1245         }
1246
1247         abstract class ImportedDefinition : IMemberDefinition
1248         {
1249                 protected class AttributesBag
1250                 {
1251                         public static readonly AttributesBag Default = new AttributesBag ();
1252
1253                         public AttributeUsageAttribute AttributeUsage;
1254                         public ObsoleteAttribute Obsolete;
1255                         public string[] Conditionals;
1256                         public string DefaultIndexerName;
1257                         public bool? CLSAttributeValue;
1258                         public TypeSpec CoClass;
1259
1260                         public static AttributesBag Read (MemberInfo mi, MetadataImporter importer)
1261                         {
1262                                 AttributesBag bag = null;
1263                                 List<string> conditionals = null;
1264
1265                                 // It should not throw any loading exception
1266                                 IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
1267
1268                                 foreach (var a in attrs) {
1269                                         var dt = a.Constructor.DeclaringType;
1270                                         string name = dt.Name;
1271                                         if (name == "ObsoleteAttribute") {
1272                                                 if (dt.Namespace != "System")
1273                                                         continue;
1274
1275                                                 if (bag == null)
1276                                                         bag = new AttributesBag ();
1277
1278                                                 var args = a.ConstructorArguments;
1279
1280                                                 if (args.Count == 1) {
1281                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
1282                                                 } else if (args.Count == 2) {
1283                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
1284                                                 } else {
1285                                                         bag.Obsolete = new ObsoleteAttribute ();
1286                                                 }
1287
1288                                                 continue;
1289                                         }
1290
1291                                         if (name == "ConditionalAttribute") {
1292                                                 if (dt.Namespace != "System.Diagnostics")
1293                                                         continue;
1294
1295                                                 if (bag == null)
1296                                                         bag = new AttributesBag ();
1297
1298                                                 if (conditionals == null)
1299                                                         conditionals = new List<string> (2);
1300
1301                                                 conditionals.Add ((string) a.ConstructorArguments[0].Value);
1302                                                 continue;
1303                                         }
1304
1305                                         if (name == "CLSCompliantAttribute") {
1306                                                 if (dt.Namespace != "System")
1307                                                         continue;
1308
1309                                                 if (bag == null)
1310                                                         bag = new AttributesBag ();
1311
1312                                                 bag.CLSAttributeValue = (bool) a.ConstructorArguments[0].Value;
1313                                                 continue;
1314                                         }
1315
1316                                         // Type only attributes
1317                                         if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
1318                                                 if (name == "DefaultMemberAttribute") {
1319                                                         if (dt.Namespace != "System.Reflection")
1320                                                                 continue;
1321
1322                                                         if (bag == null)
1323                                                                 bag = new AttributesBag ();
1324
1325                                                         bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
1326                                                         continue;
1327                                                 }
1328
1329                                                 if (name == "AttributeUsageAttribute") {
1330                                                         if (dt.Namespace != "System")
1331                                                                 continue;
1332
1333                                                         if (bag == null)
1334                                                                 bag = new AttributesBag ();
1335
1336                                                         bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
1337                                                         foreach (var named in a.NamedArguments) {
1338                                                                 if (named.MemberInfo.Name == "AllowMultiple")
1339                                                                         bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
1340                                                                 else if (named.MemberInfo.Name == "Inherited")
1341                                                                         bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
1342                                                         }
1343                                                         continue;
1344                                                 }
1345
1346                                                 // Interface only attribute
1347                                                 if (name == "CoClassAttribute") {
1348                                                         if (dt.Namespace != "System.Runtime.InteropServices")
1349                                                                 continue;
1350
1351                                                         if (bag == null)
1352                                                                 bag = new AttributesBag ();
1353
1354                                                         bag.CoClass = importer.ImportType ((MetaType) a.ConstructorArguments[0].Value);
1355                                                         continue;
1356                                                 }
1357                                         }
1358                                 }
1359
1360                                 if (bag == null)
1361                                         return Default;
1362
1363                                 if (conditionals != null)
1364                                         bag.Conditionals = conditionals.ToArray ();
1365
1366                                 return bag;
1367                         }
1368                 }
1369
1370                 protected readonly MemberInfo provider;
1371                 protected AttributesBag cattrs;
1372                 protected readonly MetadataImporter importer;
1373
1374                 public ImportedDefinition (MemberInfo provider, MetadataImporter importer)
1375                 {
1376                         this.provider = provider;
1377                         this.importer = importer;
1378                 }
1379
1380                 #region Properties
1381
1382                 public bool IsImported {
1383                         get {
1384                                 return true;
1385                         }
1386                 }
1387
1388                 public virtual string Name {
1389                         get {
1390                                 return provider.Name;
1391                         }
1392                 }
1393
1394                 #endregion
1395
1396                 public string[] ConditionalConditions ()
1397                 {
1398                         if (cattrs == null)
1399                                 ReadAttributes ();
1400
1401                         return cattrs.Conditionals;
1402                 }
1403
1404                 public ObsoleteAttribute GetAttributeObsolete ()
1405                 {
1406                         if (cattrs == null)
1407                                 ReadAttributes ();
1408
1409                         return cattrs.Obsolete;
1410                 }
1411
1412                 public bool? CLSAttributeValue {
1413                         get {
1414                                 if (cattrs == null)
1415                                         ReadAttributes ();
1416
1417                                 return cattrs.CLSAttributeValue;
1418                         }
1419                 }
1420
1421                 protected void ReadAttributes ()
1422                 {
1423                         cattrs = AttributesBag.Read (provider, importer);
1424                 }
1425
1426                 public void SetIsAssigned ()
1427                 {
1428                         // Unused for imported members
1429                 }
1430
1431                 public void SetIsUsed ()
1432                 {
1433                         // Unused for imported members
1434                 }
1435         }
1436
1437         public class ImportedModuleDefinition
1438         {
1439                 readonly Module module;
1440                 bool cls_compliant;
1441
1442                 public ImportedModuleDefinition (Module module)
1443                 {
1444                         this.module = module;
1445                 }
1446
1447                 #region Properties
1448
1449                 public bool IsCLSCompliant {
1450                         get {
1451                                 return cls_compliant;
1452                         }
1453                 }
1454
1455                 public string Name {
1456                         get {
1457                                 return module.Name;
1458                         }
1459                 }
1460
1461                 #endregion
1462
1463                 public void ReadAttributes ()
1464                 {
1465                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
1466
1467                         foreach (var a in attrs) {
1468                                 var dt = a.Constructor.DeclaringType;
1469                                 if (dt.Name == "CLSCompliantAttribute") {
1470                                         if (dt.Namespace != "System")
1471                                                 continue;
1472
1473                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1474                                         continue;
1475                                 }
1476                         }
1477                 }
1478
1479                 //
1480                 // Reads assembly attributes which where attached to a special type because
1481                 // module does have assembly manifest
1482                 //
1483                 public List<Attribute> ReadAssemblyAttributes ()
1484                 {
1485                         var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
1486                         if (t == null)
1487                                 return null;
1488
1489                         var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
1490                         if (field == null)
1491                                 return null;
1492
1493                         // TODO: implement, the idea is to fabricate specil Attribute class and
1494                         // add it to OptAttributes before resolving the source code attributes
1495                         // Need to build module location as well for correct error reporting
1496
1497                         //var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
1498                         //var attrs = new List<Attribute> (assembly_attributes.Count);
1499                         //foreach (var a in assembly_attributes)
1500                         //{
1501                         //    var type = metaImporter.ImportType (a.Constructor.DeclaringType);
1502                         //    var ctor = metaImporter.CreateMethod (a.Constructor, type);
1503
1504                         //    foreach (var carg in a.ConstructorArguments) {
1505                         //        carg.Value
1506                         //    }
1507
1508                         //    attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
1509                         //}
1510
1511                         return null;
1512                 }
1513         }
1514
1515         public class ImportedAssemblyDefinition : IAssemblyDefinition
1516         {
1517                 readonly Assembly assembly;
1518                 readonly AssemblyName aname;
1519                 bool cls_compliant;
1520
1521                 List<AssemblyName> internals_visible_to;
1522                 Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
1523
1524                 public ImportedAssemblyDefinition (Assembly assembly)
1525                 {
1526                         this.assembly = assembly;
1527                         this.aname = assembly.GetName ();
1528                 }
1529
1530                 #region Properties
1531
1532                 public Assembly Assembly {
1533                         get {
1534                                 return assembly;
1535                         }
1536                 }
1537
1538                 public string FullName {
1539                         get {
1540                                 return aname.FullName;
1541                         }
1542                 }
1543
1544                 public bool HasStrongName {
1545                         get {
1546                                 return aname.GetPublicKey ().Length != 0;
1547                         }
1548                 }
1549
1550                 public bool IsMissing {
1551                         get {
1552 #if STATIC
1553                                 return assembly.__IsMissing;
1554 #else
1555                                 return false;
1556 #endif
1557                         }
1558                 }
1559
1560                 public bool IsCLSCompliant {
1561                         get {
1562                                 return cls_compliant;
1563                         }
1564                 }
1565
1566                 public string Location {
1567                         get {
1568                                 return assembly.Location;
1569                         }
1570                 }
1571
1572                 public string Name {
1573                         get {
1574                                 return aname.Name;
1575                         }
1576                 }
1577
1578                 #endregion
1579
1580                 public byte[] GetPublicKeyToken ()
1581                 {
1582                         return aname.GetPublicKeyToken ();
1583                 }
1584
1585                 public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
1586                 {
1587                         return internals_visible_to_cache [assembly];
1588                 }
1589
1590                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1591                 {
1592                         if (internals_visible_to == null)
1593                                 return false;
1594
1595                         AssemblyName is_visible = null;
1596                         if (internals_visible_to_cache == null) {
1597                                 internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
1598                         } else {
1599                                 if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
1600                                         return is_visible != null;
1601                         }
1602
1603                         var token = assembly.GetPublicKeyToken ();
1604                         if (token != null && token.Length == 0)
1605                                 token = null;
1606
1607                         foreach (var internals in internals_visible_to) {
1608                                 if (internals.Name != assembly.Name)
1609                                         continue;
1610
1611                                 if (token == null && assembly is AssemblyDefinition) {
1612                                         is_visible = internals;
1613                                         break;
1614                                 }
1615
1616                                 if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
1617                                         continue;
1618
1619                                 is_visible = internals;
1620                                 break;
1621                         }
1622
1623                         internals_visible_to_cache.Add (assembly, is_visible);
1624                         return is_visible != null;
1625                 }
1626
1627                 public void ReadAttributes ()
1628                 {
1629 #if STATIC
1630                         if (assembly.__IsMissing)
1631                                 return;
1632 #endif
1633
1634                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
1635
1636                         foreach (var a in attrs) {
1637                                 var dt = a.Constructor.DeclaringType;
1638                                 var name = dt.Name;
1639                                 if (name == "CLSCompliantAttribute") {
1640                                         if (dt.Namespace == "System") {
1641                                                 cls_compliant = (bool) a.ConstructorArguments[0].Value;
1642                                         }
1643                                         continue;
1644                                 }
1645
1646                                 if (name == "InternalsVisibleToAttribute") {
1647                                         if (dt.Namespace != MetadataImporter.CompilerServicesNamespace)
1648                                                 continue;
1649
1650                                         string s = a.ConstructorArguments[0].Value as string;
1651                                         if (s == null)
1652                                                 continue;
1653
1654                                         var an = new AssemblyName (s);
1655                                         if (internals_visible_to == null)
1656                                                 internals_visible_to = new List<AssemblyName> ();
1657
1658                                         internals_visible_to.Add (an);
1659                                         continue;
1660                                 }
1661                         }
1662                 }
1663
1664                 public override string ToString ()
1665                 {
1666                         return FullName;
1667                 }
1668         }
1669
1670         class ImportedMemberDefinition : ImportedDefinition
1671         {
1672                 readonly TypeSpec type;
1673
1674                 public ImportedMemberDefinition (MemberInfo member, TypeSpec type, MetadataImporter importer)
1675                         : base (member, importer)
1676                 {
1677                         this.type = type;
1678                 }
1679
1680                 #region Properties
1681
1682                 public TypeSpec MemberType {
1683                         get {
1684                                 return type;
1685                         }
1686                 }
1687
1688                 #endregion
1689         }
1690
1691         class ImportedParameterMemberDefinition : ImportedMemberDefinition, IParametersMember
1692         {
1693                 readonly AParametersCollection parameters;
1694
1695                 protected ImportedParameterMemberDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1696                         : base (provider, type, importer)
1697                 {
1698                         this.parameters = parameters;
1699                 }
1700
1701                 public ImportedParameterMemberDefinition (PropertyInfo provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1702                         : base (provider, type, importer)
1703                 {
1704                         this.parameters = parameters;
1705                 }
1706
1707                 #region Properties
1708
1709                 public AParametersCollection Parameters {
1710                         get {
1711                                 return parameters;
1712                         }
1713                 }
1714
1715                 #endregion
1716         }
1717
1718         class ImportedMethodDefinition : ImportedParameterMemberDefinition, IMethodDefinition
1719         {
1720                 public ImportedMethodDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1721                         : base (provider, type, parameters, importer)
1722                 {
1723                 }
1724
1725                 MethodBase IMethodDefinition.Metadata {
1726                         get {
1727                                 return (MethodBase) provider;
1728                         }
1729                 }
1730         }
1731
1732         class ImportedGenericMethodDefinition : ImportedMethodDefinition, IGenericMethodDefinition
1733         {
1734                 readonly TypeParameterSpec[] tparams;
1735
1736                 public ImportedGenericMethodDefinition (MethodInfo provider, TypeSpec type, AParametersCollection parameters, TypeParameterSpec[] tparams, MetadataImporter importer)
1737                         : base (provider, type, parameters, importer)
1738                 {
1739                         this.tparams = tparams;
1740                 }
1741
1742                 #region Properties
1743
1744                 public TypeParameterSpec[] TypeParameters {
1745                         get {
1746                                 return tparams;
1747                         }
1748                 }
1749
1750                 public int TypeParametersCount {
1751                         get {
1752                                 return tparams.Length;
1753                         }
1754                 }
1755
1756                 #endregion
1757         }
1758
1759         class ImportedTypeDefinition : ImportedDefinition, ITypeDefinition
1760         {
1761                 TypeParameterSpec[] tparams;
1762                 string name;
1763
1764                 public ImportedTypeDefinition (MetaType type, MetadataImporter importer)
1765                         : base (type, importer)
1766                 {
1767                 }
1768
1769                 #region Properties
1770
1771                 public IAssemblyDefinition DeclaringAssembly {
1772                         get {
1773                                 return importer.GetAssemblyDefinition (provider.Module.Assembly);
1774                         }
1775                 }
1776
1777                 bool ITypeDefinition.IsComImport {
1778                         get {
1779                                 return ((MetaType) provider).IsImport;
1780                         }
1781                 }
1782
1783
1784                 bool ITypeDefinition.IsPartial {
1785                         get {
1786                                 return false;
1787                         }
1788                 }
1789
1790                 bool ITypeDefinition.IsTypeForwarder {
1791                         get {
1792 #if STATIC
1793                                 return ((MetaType) provider).__IsTypeForwarder;
1794 #else
1795                                 return false;
1796 #endif
1797                         }
1798                 }
1799
1800                 public override string Name {
1801                         get {
1802                                 if (name == null) {
1803                                         name = base.Name;
1804                                         if (tparams != null) {
1805                                                 int arity_start = name.IndexOf ('`');
1806                                                 if (arity_start > 0)
1807                                                         name = name.Substring (0, arity_start);
1808                                         }
1809                                 }
1810
1811                                 return name;
1812                         }
1813                 }
1814
1815                 public string Namespace {
1816                         get {
1817                                 return ((MetaType) provider).Namespace;
1818                         }
1819                 }
1820
1821                 public int TypeParametersCount {
1822                         get {
1823                                 return tparams == null ? 0 : tparams.Length;
1824                         }
1825                 }
1826
1827                 public TypeParameterSpec[] TypeParameters {
1828                         get {
1829                                 return tparams;
1830                         }
1831                         set {
1832                                 tparams = value;
1833                         }
1834                 }
1835
1836                 #endregion
1837
1838                 public void DefineInterfaces (TypeSpec spec)
1839                 {
1840                         var type = (MetaType) provider;
1841                         MetaType[] ifaces;
1842 #if STATIC
1843                         ifaces = type.__GetDeclaredInterfaces ();
1844                         if (ifaces.Length != 0) {
1845                                 foreach (var iface in ifaces) {
1846                                         var it = importer.CreateType (iface);
1847                                         if (it == null)
1848                                                 continue;
1849
1850                                         spec.AddInterfaceDefined (it);
1851
1852                                         // Unfortunately not all languages expand inherited interfaces
1853                                         var bifaces = it.Interfaces;
1854                                         if (bifaces != null) {
1855                                                 foreach (var biface in bifaces) {
1856                                                         spec.AddInterfaceDefined (biface);
1857                                                 }
1858                                         }
1859                                 }
1860                         }
1861
1862                         //
1863                         // It's impossible to get declared interfaces only using System.Reflection
1864                         // hence we need to mimic the behavior with ikvm-reflection too to keep
1865                         // our type look-up logic same
1866                         //
1867                         if (spec.BaseType != null) {
1868                                 var bifaces = spec.BaseType.Interfaces;
1869                                 if (bifaces != null) {
1870                                         //
1871                                         // Before adding base class interfaces close defined interfaces
1872                                         // on type parameter
1873                                         //
1874                                         var tp = spec as TypeParameterSpec;
1875                                         if (tp != null && tp.InterfacesDefined == null) {
1876                                                 tp.InterfacesDefined = TypeSpec.EmptyTypes;
1877                                         }
1878
1879                                         foreach (var iface in bifaces)
1880                                                 spec.AddInterfaceDefined (iface);
1881                                 }
1882                         }
1883 #else
1884                         ifaces = type.GetInterfaces ();
1885
1886                         if (ifaces.Length > 0) {
1887                                 foreach (var iface in ifaces) {
1888                                         spec.AddInterface (importer.CreateType (iface));
1889                                 }
1890                         }
1891 #endif
1892
1893                 }
1894
1895                 public static void Error_MissingDependency (IMemberContext ctx, List<MissingTypeSpecReference> missing, Location loc)
1896                 {
1897                         //
1898                         // Report details about missing type and most likely cause of the problem.
1899                         // csc reports 1683, 1684 as warnings but we report them only when used
1900                         // or referenced from the user core in which case compilation error has to
1901                         // be reported because compiler cannot continue anyway
1902                         //
1903
1904                         var report = ctx.Module.Compiler.Report;
1905
1906                         for (int i = 0; i < missing.Count; ++i) {
1907                                 var t = missing [i].Type;
1908
1909                                 //
1910                                 // Report missing types only once
1911                                 //
1912                                 if (report.Printer.MissingTypeReported (t.MemberDefinition))
1913                                         continue;
1914
1915                                 string name = t.GetSignatureForError ();
1916
1917                                 var caller = missing[i].Caller;
1918                                 if (caller.Kind != MemberKind.MissingType)
1919                                         report.SymbolRelatedToPreviousError (caller);
1920
1921                                 if (t.MemberDefinition.DeclaringAssembly == ctx.Module.DeclaringAssembly) {
1922                                         report.Error (1683, loc,
1923                                                 "Reference to type `{0}' claims it is defined in this assembly, but it is not defined in source or any added modules",
1924                                                 name);
1925                                 } else if (t.MemberDefinition.DeclaringAssembly.IsMissing) {
1926                                         if (t.MemberDefinition.IsTypeForwarder) {
1927                                                 report.Error (1070, loc,
1928                                                         "The type `{0}' has been forwarded to an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
1929                                                         name, t.MemberDefinition.DeclaringAssembly.FullName);
1930                                         } else {
1931                                                 report.Error (12, loc,
1932                                                         "The type `{0}' is defined in an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
1933                                                         name, t.MemberDefinition.DeclaringAssembly.FullName);
1934                                         }
1935                                 } else {
1936                                         report.Error (1684, loc,
1937                                                 "Reference to type `{0}' claims it is defined assembly `{1}', but it could not be found",
1938                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
1939                                 }
1940                         }
1941                 }
1942
1943                 public TypeSpec GetAttributeCoClass ()
1944                 {
1945                         if (cattrs == null)
1946                                 ReadAttributes ();
1947
1948                         return cattrs.CoClass;
1949                 }
1950
1951                 public string GetAttributeDefaultMember ()
1952                 {
1953                         if (cattrs == null)
1954                                 ReadAttributes ();
1955
1956                         return cattrs.DefaultIndexerName;
1957                 }
1958
1959                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
1960                 {
1961                         if (cattrs == null)
1962                                 ReadAttributes ();
1963
1964                         return cattrs.AttributeUsage;
1965                 }
1966
1967                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
1968                 {
1969                         var a = importer.GetAssemblyDefinition (provider.Module.Assembly);
1970                         return a == assembly || a.IsFriendAssemblyTo (assembly);
1971                 }
1972
1973                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
1974                 {
1975                         //
1976                         // Not interested in members of nested private types unless the importer needs them
1977                         //
1978                         if (declaringType.IsPrivate && importer.IgnorePrivateMembers) {
1979                                 cache = MemberCache.Empty;
1980                                 return;
1981                         }
1982
1983                         var loading_type = (MetaType) provider;
1984                         const BindingFlags all_members = BindingFlags.DeclaredOnly |
1985                                 BindingFlags.Static | BindingFlags.Instance |
1986                                 BindingFlags.Public | BindingFlags.NonPublic;
1987
1988                         const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
1989                                         MethodAttributes.Virtual | MethodAttributes.HideBySig |
1990                                         MethodAttributes.Final;
1991
1992                         Dictionary<MethodBase, MethodSpec> possible_accessors = null;
1993                         List<EventSpec> imported_events = null;
1994                         EventSpec event_spec;
1995                         MemberSpec imported;
1996                         MethodInfo m;
1997                         MemberInfo[] all;
1998                         try {
1999                                 all = loading_type.GetMembers (all_members);
2000                         } catch (Exception e) {
2001                                 throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
2002                                         declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
2003                         }
2004
2005                         if (cache == null) {
2006                                 cache = new MemberCache (all.Length);
2007
2008                                 //
2009                                 // Do the types first as they can be referenced by the members before
2010                                 // they are found or inflated
2011                                 //
2012                                 foreach (var member in all) {
2013                                         if (member.MemberType != MemberTypes.NestedType)
2014                                                 continue;
2015
2016                                         var t = (MetaType) member;
2017
2018                                         // Ignore compiler generated types, mostly lambda containers
2019                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2020                                                 continue;
2021
2022                                         try {
2023                                                 imported = importer.CreateNestedType (t, declaringType);
2024                                         } catch (Exception e) {
2025                                                 throw new InternalErrorException (e, "Could not import nested type `{0}' from `{1}'",
2026                                                         t.FullName, declaringType.MemberDefinition.DeclaringAssembly.FullName);
2027                                         }
2028
2029                                         cache.AddMemberImported (imported);
2030                                 }
2031
2032                                 foreach (var member in all) {
2033                                         if (member.MemberType != MemberTypes.NestedType)
2034                                                 continue;
2035
2036                                         var t = (MetaType) member;
2037
2038                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2039                                                 continue;
2040
2041                                         importer.ImportTypeBase (t);
2042                                 }
2043                         }
2044
2045                         //
2046                         // Load base interfaces first to minic behaviour of compiled members
2047                         //
2048                         if (declaringType.IsInterface && declaringType.Interfaces != null) {
2049                                 foreach (var iface in declaringType.Interfaces) {
2050                                         cache.AddInterface (iface);
2051                                 }
2052                         }
2053
2054                         if (!onlyTypes) {
2055                                 //
2056                                 // The logic here requires methods to be returned first which seems to work for both Mono and .NET
2057                                 //
2058                                 foreach (var member in all) {
2059                                         switch (member.MemberType) {
2060                                         case MemberTypes.Constructor:
2061                                                 if (declaringType.IsInterface)
2062                                                         continue;
2063
2064                                                 goto case MemberTypes.Method;
2065                                         case MemberTypes.Method:
2066                                                 MethodBase mb = (MethodBase) member;
2067                                                 var attrs = mb.Attributes;
2068
2069                                                 if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
2070                                                         if (importer.IgnorePrivateMembers)
2071                                                                 continue;
2072
2073                                                         // Ignore explicitly implemented members
2074                                                         if ((attrs & explicit_impl) == explicit_impl)
2075                                                                 continue;
2076
2077                                                         // Ignore compiler generated methods
2078                                                         if (MetadataImporter.HasAttribute (CustomAttributeData.GetCustomAttributes (mb), "CompilerGeneratedAttribute", MetadataImporter.CompilerServicesNamespace))
2079                                                                 continue;
2080                                                 }
2081
2082                                                 imported = importer.CreateMethod (mb, declaringType);
2083                                                 if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
2084                                                         if (possible_accessors == null)
2085                                                                 possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
2086
2087                                                         // There are no metadata rules for accessors, we have to consider any method as possible candidate
2088                                                         possible_accessors.Add (mb, (MethodSpec) imported);
2089                                                 }
2090
2091                                                 break;
2092                                         case MemberTypes.Property:
2093                                                 if (possible_accessors == null)
2094                                                         continue;
2095
2096                                                 var p = (PropertyInfo) member;
2097                                                 //
2098                                                 // Links possible accessors with property
2099                                                 //
2100                                                 MethodSpec get, set;
2101                                                 m = p.GetGetMethod (true);
2102                                                 if (m == null || !possible_accessors.TryGetValue (m, out get))
2103                                                         get = null;
2104
2105                                                 m = p.GetSetMethod (true);
2106                                                 if (m == null || !possible_accessors.TryGetValue (m, out set))
2107                                                         set = null;
2108
2109                                                 // No accessors registered (e.g. explicit implementation)
2110                                                 if (get == null && set == null)
2111                                                         continue;
2112
2113                                                 try {
2114                                                         imported = importer.CreateProperty (p, declaringType, get, set);
2115                                                 } catch (Exception ex) {
2116                                                         throw new InternalErrorException (ex, "Could not import property `{0}' inside `{1}'",
2117                                                                 p.Name, declaringType.GetSignatureForError ());
2118                                                 }
2119
2120                                                 if (imported == null)
2121                                                         continue;
2122
2123                                                 break;
2124                                         case MemberTypes.Event:
2125                                                 if (possible_accessors == null)
2126                                                         continue;
2127
2128                                                 var e = (EventInfo) member;
2129                                                 //
2130                                                 // Links accessors with event
2131                                                 //
2132                                                 MethodSpec add, remove;
2133                                                 m = e.GetAddMethod (true);
2134                                                 if (m == null || !possible_accessors.TryGetValue (m, out add))
2135                                                         add = null;
2136
2137                                                 m = e.GetRemoveMethod (true);
2138                                                 if (m == null || !possible_accessors.TryGetValue (m, out remove))
2139                                                         remove = null;
2140
2141                                                 // Both accessors are required
2142                                                 if (add == null || remove == null)
2143                                                         continue;
2144
2145                                                 event_spec = importer.CreateEvent (e, declaringType, add, remove);
2146                                                 if (!importer.IgnorePrivateMembers) {
2147                                                         if (imported_events == null)
2148                                                                 imported_events = new List<EventSpec> ();
2149
2150                                                         imported_events.Add (event_spec);
2151                                                 }
2152
2153                                                 imported = event_spec;
2154                                                 break;
2155                                         case MemberTypes.Field:
2156                                                 var fi = (FieldInfo) member;
2157
2158                                                 imported = importer.CreateField (fi, declaringType);
2159                                                 if (imported == null)
2160                                                         continue;
2161
2162                                                 //
2163                                                 // For dynamic binder event has to be fully restored to allow operations
2164                                                 // within the type container to work correctly
2165                                                 //
2166                                                 if (imported_events != null) {
2167                                                         // The backing event field should be private but it may not
2168                                                         int i;
2169                                                         for (i = 0; i < imported_events.Count; ++i) {
2170                                                                 var ev = imported_events[i];
2171                                                                 if (ev.Name == fi.Name) {
2172                                                                         ev.BackingField = (FieldSpec) imported;
2173                                                                         imported_events.RemoveAt (i);
2174                                                                         i = -1;
2175                                                                         break;
2176                                                                 }
2177                                                         }
2178
2179                                                         if (i < 0)
2180                                                                 continue;
2181                                                 }
2182
2183                                                 break;
2184                                         case MemberTypes.NestedType:
2185                                                 // Already in the cache from the first pass
2186                                                 continue;
2187                                         default:
2188                                                 throw new NotImplementedException (member.ToString ());
2189                                         }
2190
2191                                         if (imported.IsStatic && declaringType.IsInterface)
2192                                                 continue;
2193
2194                                         cache.AddMemberImported (imported);
2195                                 }
2196                         }
2197                 }
2198         }
2199
2200         class ImportedTypeParameterDefinition : ImportedDefinition, ITypeDefinition
2201         {
2202                 public ImportedTypeParameterDefinition (MetaType type, MetadataImporter importer)
2203                         : base (type, importer)
2204                 {
2205                 }
2206
2207                 #region Properties
2208
2209                 public IAssemblyDefinition DeclaringAssembly {
2210                         get {
2211                                 throw new NotImplementedException ();
2212                         }
2213                 }
2214
2215                 bool ITypeDefinition.IsComImport {
2216                         get {
2217                                 return false;
2218                         }
2219                 }
2220
2221                 bool ITypeDefinition.IsPartial {
2222                         get {
2223                                 return false;
2224                         }
2225                 }
2226
2227                 bool ITypeDefinition.IsTypeForwarder {
2228                         get {
2229                                 return false;
2230                         }
2231                 }
2232
2233                 public string Namespace {
2234                         get {
2235                                 return null;
2236                         }
2237                 }
2238
2239                 public int TypeParametersCount {
2240                         get {
2241                                 return 0;
2242                         }
2243                 }
2244
2245                 public TypeParameterSpec[] TypeParameters {
2246                         get {
2247                                 return null;
2248                         }
2249                 }
2250
2251                 #endregion
2252
2253                 public TypeSpec GetAttributeCoClass ()
2254                 {
2255                         return null;
2256                 }
2257
2258                 public string GetAttributeDefaultMember ()
2259                 {
2260                         throw new NotSupportedException ();
2261                 }
2262
2263                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2264                 {
2265                         throw new NotSupportedException ();
2266                 }
2267
2268                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2269                 {
2270                         throw new NotImplementedException ();
2271                 }
2272
2273                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2274                 {
2275                         throw new NotImplementedException ();
2276                 }
2277         }
2278 }