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 ()
  60                         {
  61                                 if (provider != null)
  62                                         ReadAttribute ();
  63
  64                                 return flags != null && Position < flags.Length && flags[Position];
  65                         }
  66
  67                         //
  68                         // Returns true when DynamicAttribute exists
  69                         //
  70                         public bool HasDynamicAttribute ()
  71                         {
  72                                 if (provider != null)
  73                                         ReadAttribute ();
  74
  75                                 return flags != null;
  76                         }
  77
  78                         IList<CustomAttributeData> GetCustomAttributes ()
  79                         {
  80                                 var mi = provider as MemberInfo;
  81                                 if (mi != null)
  82                                         return CustomAttributeData.GetCustomAttributes (mi);
  83
  84                                 var pi = provider as ParameterInfo;
  85                                 if (pi != null)
  86                                         return CustomAttributeData.GetCustomAttributes (pi);
  87
  88                                 provider = null;
  89                                 return null;
  90                         }
  91
  92                         void ReadAttribute ()
  93                         {
  94                                 var cad = GetCustomAttributes ();
  95                                 if (cad == null) {
  96                                         return;
  97                                 }
  98
  99                                 if (cad.Count > 0) {
 100                                         foreach (var ca in cad) {
 101                                                 var dt = ca.Constructor.DeclaringType;
 102                                                 if (dt.Name != "DynamicAttribute" || dt.Namespace != CompilerServicesNamespace)
 103                                                         continue;
 104
 105                                                 if (ca.ConstructorArguments.Count == 0) {
 106                                                         flags = single_attribute;
 107                                                         break;
 108                                                 }
 109
 110                                                 var arg_type = ca.ConstructorArguments[0].ArgumentType;
 111
 112                                                 if (arg_type.IsArray && MetaType.GetTypeCode (arg_type.GetElementType ()) == TypeCode.Boolean) {
 113                                                         var carg = (IList<CustomAttributeTypedArgument>) ca.ConstructorArguments[0].Value;
 114                                                         flags = new bool[carg.Count];
 115                                                         for (int i = 0; i < flags.Length; ++i) {
 116                                                                 if (MetaType.GetTypeCode (carg[i].ArgumentType) == TypeCode.Boolean)
 117                                                                         flags[i] = (bool) carg[i].Value;
 118                                                         }
 119
 120                                                         break;
 121                                                 }
 122                                         }
 123                                 }
 124
 125                                 provider = null;
 126                         }
 127                 }
 128
 129                 protected readonly Dictionary<MetaType, TypeSpec> import_cache;
 130                 protected readonly Dictionary<MetaType, TypeSpec> compiled_types;
 131                 protected readonly Dictionary<Assembly, IAssemblyDefinition> assembly_2_definition;
 132                 protected readonly ModuleContainer module;
 133
 134                 public static readonly string CompilerServicesNamespace = "System.Runtime.CompilerServices";
 135
 136                 protected MetadataImporter (ModuleContainer module)
 137                 {
 138                         this.module = module;
 139
 140                         import_cache = new Dictionary<MetaType, TypeSpec> (1024, ReferenceEquality<MetaType>.Default);
 141                         compiled_types = new Dictionary<MetaType, TypeSpec> (40, ReferenceEquality<MetaType>.Default);
 142                         assembly_2_definition = new Dictionary<Assembly, IAssemblyDefinition> (ReferenceEquality<Assembly>.Default);
 143                         IgnorePrivateMembers = true;
 144                 }
 145
 146                 #region Properties
 147
 148                 public ICollection<IAssemblyDefinition> Assemblies {
 149                         get {
 150                                 return assembly_2_definition.Values;
 151                         }
 152                 }
 153
 154                 public bool IgnorePrivateMembers { get; set; }
 155
 156                 #endregion
 157
 158                 public abstract void AddCompiledType (TypeBuilder builder, TypeSpec spec);
 159                 protected abstract MemberKind DetermineKindFromBaseType (MetaType baseType);
 160                 protected abstract bool HasVolatileModifier (MetaType[] modifiers);
 161
 162                 public FieldSpec CreateField (FieldInfo fi, TypeSpec declaringType)
 163                 {
 164                         Modifiers mod;
 165                         var fa = fi.Attributes;
 166                         switch (fa & FieldAttributes.FieldAccessMask) {
 167                                 case FieldAttributes.Public:
 168                                         mod = Modifiers.PUBLIC;
 169                                         break;
 170                                 case FieldAttributes.Assembly:
 171                                         mod = Modifiers.INTERNAL;
 172                                         break;
 173                                 case FieldAttributes.Family:
 174                                         mod = Modifiers.PROTECTED;
 175                                         break;
 176                                 case FieldAttributes.FamORAssem:
 177                                         mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 178                                         break;
 179                                 default:
 180                                         // Ignore private fields (even for error reporting) to not require extra dependencies
 181                                         if ((IgnorePrivateMembers && !declaringType.IsStruct) ||
 182                                                 HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "CompilerGeneratedAttribute", CompilerServicesNamespace))
 183                                                 return null;
 184
 185                                         mod = Modifiers.PRIVATE;
 186                                         break;
 187                         }
 188
 189                         TypeSpec field_type;
 190
 191                         try {
 192                                 field_type = ImportType (fi.FieldType, new DynamicTypeReader (fi));
 193
 194                                 //
 195                                 // Private field has private type which is not fixed buffer
 196                                 //
 197                                 if (field_type == null)
 198                                         return null;
 199                         } catch (Exception e) {
 200                                 // TODO: I should construct fake TypeSpec based on TypeRef signature
 201                                 // but there is no way to do it with System.Reflection
 202                                 throw new InternalErrorException (e, "Cannot import field `{0}.{1}' referenced in assembly `{2}'",
 203                                         declaringType.GetSignatureForError (), fi.Name, declaringType.MemberDefinition.DeclaringAssembly);
 204                         }
 205
 206                         var definition = new ImportedMemberDefinition (fi, field_type, this);
 207
 208                         if ((fa & FieldAttributes.Literal) != 0) {
 209                                 Constant c = field_type.Kind == MemberKind.MissingType ?
 210                                         new NullConstant (InternalType.ErrorType, Location.Null) :
 211                                         Constant.CreateConstantFromValue (field_type, fi.GetRawConstantValue (), Location.Null);
 212                                 return new ConstSpec (declaringType, definition, field_type, fi, mod, c);
 213                         }
 214
 215                         if ((fa & FieldAttributes.InitOnly) != 0) {
 216                                 if (field_type.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 217                                         var dc = ReadDecimalConstant (CustomAttributeData.GetCustomAttributes (fi));
 218                                         if (dc != null)
 219                                                 return new ConstSpec (declaringType, definition, field_type, fi, mod, dc);
 220                                 }
 221
 222                                 mod |= Modifiers.READONLY;
 223                         } else {
 224                                 var req_mod = fi.GetRequiredCustomModifiers ();
 225                                 if (req_mod.Length > 0 && HasVolatileModifier (req_mod))
 226                                         mod |= Modifiers.VOLATILE;
 227                         }
 228
 229                         if ((fa & FieldAttributes.Static) != 0) {
 230                                 mod |= Modifiers.STATIC;
 231                         } else {
 232                                 // Fixed buffers cannot be static
 233                                 if (declaringType.IsStruct && field_type.IsStruct && field_type.IsNested &&
 234                                         HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "FixedBufferAttribute", CompilerServicesNamespace)) {
 235
 236                                         // TODO: Sanity check on field_type (only few types are allowed)
 237                                         var element_field = CreateField (fi.FieldType.GetField (FixedField.FixedElementName), declaringType);
 238                                         return new FixedFieldSpec (module, declaringType, definition, fi, element_field, mod);
 239                                 }
 240                         }
 241
 242                         return new FieldSpec (declaringType, definition, field_type, fi, mod);
 243                 }
 244
 245                 public EventSpec CreateEvent (EventInfo ei, TypeSpec declaringType, MethodSpec add, MethodSpec remove)
 246                 {
 247                         add.IsAccessor = true;
 248                         remove.IsAccessor = true;
 249
 250                         if (add.Modifiers != remove.Modifiers)
 251                                 throw new NotImplementedException ("Different accessor modifiers " + ei.Name);
 252
 253                         var event_type = ImportType (ei.EventHandlerType, new DynamicTypeReader (ei));
 254                         var definition = new ImportedMemberDefinition (ei, event_type,  this);
 255                         return new EventSpec (declaringType, definition, event_type, add.Modifiers, add, remove);
 256                 }
 257
 258                 TypeParameterSpec[] CreateGenericParameters (MetaType type, TypeSpec declaringType)
 259                 {
 260                         var tparams = type.GetGenericArguments ();
 261
 262                         int parent_owned_count;
 263                         if (type.IsNested) {
 264                                 parent_owned_count = type.DeclaringType.GetGenericArguments ().Length;
 265
 266                                 //
 267                                 // System.Reflection duplicates parent type parameters for each
 268                                 // nested type with slightly modified properties (eg. different owner)
 269                                 // This just makes things more complicated (think of cloned constraints)
 270                                 // therefore we remap any nested type owned by parent using `type_cache'
 271                                 // to the single TypeParameterSpec
 272                                 //
 273                                 if (declaringType != null && parent_owned_count > 0) {
 274                                         int read_count = 0;
 275                                         while (read_count != parent_owned_count) {
 276                                                 var tparams_count = declaringType.Arity;
 277                                                 if (tparams_count != 0) {
 278                                                         var parent_tp = declaringType.MemberDefinition.TypeParameters;
 279                                                         read_count += tparams_count;
 280                                                         for (int i = 0; i < tparams_count; i++) {
 281                                                                 import_cache.Add (tparams[parent_owned_count - read_count + i], parent_tp[i]);
 282                                                         }
 283                                                 }
 284
 285                                                 declaringType = declaringType.DeclaringType;
 286                                         }
 287                                 }
 288                         } else {
 289                                 parent_owned_count = 0;
 290                         }
 291
 292                         if (tparams.Length - parent_owned_count == 0)
 293                                 return null;
 294
 295                         return CreateGenericParameters (parent_owned_count, tparams);
 296                 }
 297
 298                 TypeParameterSpec[] CreateGenericParameters (int first, MetaType[] tparams)
 299                 {
 300                         var tspec = new TypeParameterSpec[tparams.Length - first];
 301                         for (int pos = first; pos < tparams.Length; ++pos) {
 302                                 var type = tparams[pos];
 303                                 int index = pos - first;
 304
 305                                 tspec[index] = (TypeParameterSpec) CreateType (type, new DynamicTypeReader (), false);
 306                         }
 307
 308                         return tspec;
 309                 }
 310
 311                 TypeSpec[] CreateGenericArguments (int first, MetaType[] tparams, DynamicTypeReader dtype)
 312                 {
 313                         ++dtype.Position;
 314
 315                         var tspec = new TypeSpec [tparams.Length - first];
 316                         for (int pos = first; pos < tparams.Length; ++pos) {
 317                                 var type = tparams[pos];
 318                                 int index = pos - first;
 319
 320                                 TypeSpec spec;
 321                                 if (type.HasElementType) {
 322                                         var element = type.GetElementType ();
 323                                         ++dtype.Position;
 324                                         spec = ImportType (element, dtype);
 325
 326                                         if (!type.IsArray) {
 327                                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
 328                                         }
 329
 330                                         spec = ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
 331                                 } else {
 332                                         spec = CreateType (type, dtype, true);
 333
 334                                         //
 335                                         // We treat nested generic types as inflated internally where
 336                                         // reflection uses type definition
 337                                         //
 338                                         // class A<T> {
 339                                         //    IFoo<A<T>> foo;   // A<T> is definition in this case
 340                                         // }
 341                                         //
 342                                         if (!IsMissingType (type) && type.IsGenericTypeDefinition) {
 343                                                 var start_pos = spec.DeclaringType == null ? 0 : spec.DeclaringType.MemberDefinition.TypeParametersCount;
 344                                                 var targs = CreateGenericArguments (start_pos, type.GetGenericArguments (), dtype);
 345                                                 spec = spec.MakeGenericType (module, targs);
 346                                         }
 347                                 }
 348
 349                                 if (spec == null)
 350                                         return null;
 351
 352                                 ++dtype.Position;
 353                                 tspec[index] = spec;
 354                         }
 355
 356                         return tspec;
 357                 }
 358
 359                 public MethodSpec CreateMethod (MethodBase mb, TypeSpec declaringType)
 360                 {
 361                         Modifiers mod = ReadMethodModifiers (mb, declaringType);
 362                         TypeParameterSpec[] tparams;
 363
 364                         var parameters = CreateParameters (declaringType, mb.GetParameters (), mb);
 365
 366                         if (mb.IsGenericMethod) {
 367                                 if (!mb.IsGenericMethodDefinition)
 368                                         throw new NotSupportedException ("assert");
 369
 370                                 tparams = CreateGenericParameters (0, mb.GetGenericArguments ());
 371                         } else {
 372                                 tparams = null;
 373                         }
 374
 375                         MemberKind kind;
 376                         TypeSpec returnType;
 377                         if (mb.MemberType == MemberTypes.Constructor) {
 378                                 kind = MemberKind.Constructor;
 379                                 returnType = module.Compiler.BuiltinTypes.Void;
 380                         } else {
 381                                 //
 382                                 // Detect operators and destructors
 383                                 //
 384                                 string name = mb.Name;
 385                                 kind = MemberKind.Method;
 386                                 if (tparams == null && !mb.DeclaringType.IsInterface && name.Length > 6) {
 387                                         if ((mod & (Modifiers.STATIC | Modifiers.PUBLIC)) == (Modifiers.STATIC | Modifiers.PUBLIC)) {
 388                                                 if (name[2] == '_' && name[1] == 'p' && name[0] == 'o' && (mb.Attributes & MethodAttributes.SpecialName) != 0) {
 389                                                         var op_type = Operator.GetType (name);
 390                                                         if (op_type.HasValue && parameters.Count > 0 && parameters.Count < 3) {
 391                                                                 kind = MemberKind.Operator;
 392                                                         }
 393                                                 }
 394                                         } else if (parameters.IsEmpty && name == Destructor.MetadataName) {
 395                                                 kind = MemberKind.Destructor;
 396                                                 if (declaringType.BuiltinType == BuiltinTypeSpec.Type.Object) {
 397                                                         mod &= ~Modifiers.OVERRIDE;
 398                                                         mod |= Modifiers.VIRTUAL;
 399                                                 }
 400                                         }
 401                                 }
 402
 403                                 var mi = (MethodInfo) mb;
 404                                 returnType = ImportType (mi.ReturnType, new DynamicTypeReader (mi.ReturnParameter));
 405
 406                                 // Cannot set to OVERRIDE without full hierarchy checks
 407                                 // this flag indicates that the method could be override
 408                                 // but further validation is needed
 409                                 if ((mod & Modifiers.OVERRIDE) != 0) {
 410                                         bool is_real_override = false;
 411                                         if (kind == MemberKind.Method && declaringType.BaseType != null) {
 412                                                 var btype = declaringType.BaseType;
 413                                                 if (IsOverrideMethodBaseTypeAccessible (btype)) {
 414                                                         var filter = MemberFilter.Method (name, tparams != null ? tparams.Length : 0, parameters, null);
 415                                                         var candidate = MemberCache.FindMember (btype, filter, BindingRestriction.None);
 416
 417                                                         //
 418                                                         // For imported class method do additional validation to be sure that metadata
 419                                                         // override flag was correct
 420                                                         //
 421                                                         // Difference between protected internal and protected is ok
 422                                                         //
 423                                                         const Modifiers conflict_mask = Modifiers.AccessibilityMask & ~Modifiers.INTERNAL;
 424                                                         if (candidate != null && (candidate.Modifiers & conflict_mask) == (mod & conflict_mask) && !candidate.IsStatic) {
 425                                                                 is_real_override = true;
 426                                                         }
 427                                                 }
 428                                         }
 429
 430                                         if (!is_real_override) {
 431                                                 mod &= ~Modifiers.OVERRIDE;
 432                                                 if ((mod & Modifiers.SEALED) != 0)
 433                                                         mod &= ~Modifiers.SEALED;
 434                                                 else
 435                                                         mod |= Modifiers.VIRTUAL;
 436                                         }
 437                                 } else if (parameters.HasExtensionMethodType) {
 438                                         mod |= Modifiers.METHOD_EXTENSION;
 439                                 }
 440                         }
 441
 442                         IMethodDefinition definition;
 443                         if (tparams != null) {
 444                                 var gmd = new ImportedGenericMethodDefinition ((MethodInfo) mb, returnType, parameters, tparams, this);
 445                                 foreach (var tp in gmd.TypeParameters) {
 446                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
 447                                 }
 448
 449                                 definition = gmd;
 450                         } else {
 451                                 definition = new ImportedMethodDefinition (mb, returnType, parameters, this);
 452                         }
 453
 454                         MethodSpec ms = new MethodSpec (kind, declaringType, definition, returnType, parameters, mod);
 455                         if (tparams != null)
 456                                 ms.IsGeneric = true;
 457
 458                         return ms;
 459                 }
 460
 461                 bool IsOverrideMethodBaseTypeAccessible (TypeSpec baseType)
 462                 {
 463                         switch (baseType.Modifiers & Modifiers.AccessibilityMask) {
 464                         case Modifiers.PUBLIC:
 465                                 return true;
 466                         case Modifiers.INTERNAL:
 467                                 //
 468                                 // Check whether imported method in base type is accessible from compiled
 469                                 // context
 470                                 //
 471                                 return baseType.MemberDefinition.IsInternalAsPublic (module.DeclaringAssembly);
 472                         case Modifiers.PRIVATE:
 473                                 return false;
 474                         default:
 475                                 // protected
 476                                 // protected internal
 477                                 //
 478                                 // Method accessibility checks will be done later based on context
 479                                 // where the method is called (CS0122 error will be reported for inaccessible)
 480                                 //
 481                                 return true;
 482                         }
 483                 }
 484
 485                 //
 486                 // Imports System.Reflection parameters
 487                 //
 488                 AParametersCollection CreateParameters (TypeSpec parent, ParameterInfo[] pi, MethodBase method)
 489                 {
 490                         int varargs = method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0 ? 1 : 0;
 491
 492                         if (pi.Length == 0 && varargs == 0)
 493                                 return ParametersCompiled.EmptyReadOnlyParameters;
 494
 495                         TypeSpec[] types = new TypeSpec[pi.Length + varargs];
 496                         IParameterData[] par = new IParameterData[pi.Length + varargs];
 497                         bool is_params = false;
 498                         for (int i = 0; i < pi.Length; i++) {
 499                                 ParameterInfo p = pi[i];
 500                                 Parameter.Modifier mod = 0;
 501                                 Expression default_value = null;
 502                                 if (p.ParameterType.IsByRef) {
 503                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 504                                                 mod = Parameter.Modifier.OUT;
 505                                         else
 506                                                 mod = Parameter.Modifier.REF;
 507
 508                                         //
 509                                         // Strip reference wrapping
 510                                         //
 511                                         var el = p.ParameterType.GetElementType ();
 512                                         types[i] = ImportType (el, new DynamicTypeReader (p));  // TODO: 1-based positio to be csc compatible
 513                                 } else if (i == 0 && method.IsStatic && (parent.Modifiers & Modifiers.METHOD_EXTENSION) != 0 &&
 514                                         HasAttribute (CustomAttributeData.GetCustomAttributes (method), "ExtensionAttribute", CompilerServicesNamespace)) {
 515                                         mod = Parameter.Modifier.This;
 516                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 517                                 } else {
 518                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 519
 520                                         if (i >= pi.Length - 2 && types[i] is ArrayContainer) {
 521                                                 if (HasAttribute (CustomAttributeData.GetCustomAttributes (p), "ParamArrayAttribute", "System")) {
 522                                                         mod = Parameter.Modifier.PARAMS;
 523                                                         is_params = true;
 524                                                 }
 525                                         }
 526
 527                                         if (!is_params && p.IsOptional) {
 528                                                 object value = p.RawDefaultValue;
 529                                                 var ptype = types[i];
 530                                                 if ((p.Attributes & ParameterAttributes.HasDefault) != 0 && ptype.Kind != MemberKind.TypeParameter && (value != null || TypeSpec.IsReferenceType (ptype))) {
 531                                                         if (value == null) {
 532                                                                 default_value = Constant.CreateConstantFromValue (ptype, null, Location.Null);
 533                                                         } else {
 534                                                                 default_value = ImportParameterConstant (value);
 535
 536                                                                 if (ptype.IsEnum) {
 537                                                                         default_value = new EnumConstant ((Constant) default_value, ptype);
 538                                                                 }
 539                                                         }
 540
 541                                                         var attrs = CustomAttributeData.GetCustomAttributes (p);
 542                                                         for (int ii = 0; ii < attrs.Count; ++ii) {
 543                                                                 var attr = attrs[ii];
 544                                                                 var dt = attr.Constructor.DeclaringType;
 545                                                                 if (dt.Namespace != CompilerServicesNamespace)
 546                                                                         continue;
 547
 548                                                                 if (dt.Name == "CallerLineNumberAttribute" && (ptype.BuiltinType == BuiltinTypeSpec.Type.Int || Convert.ImplicitNumericConversionExists (module.Compiler.BuiltinTypes.Int, ptype)))
 549                                                                         mod |= Parameter.Modifier.CallerLineNumber;
 550                                                                 else if (dt.Name == "CallerFilePathAttribute" && Convert.ImplicitReferenceConversionExists (module.Compiler.BuiltinTypes.String, ptype))
 551                                                                         mod |= Parameter.Modifier.CallerFilePath;
 552                                                                 else if (dt.Name == "CallerMemberNameAttribute" && Convert.ImplicitReferenceConversionExists (module.Compiler.BuiltinTypes.String, ptype))
 553                                                                         mod |= Parameter.Modifier.CallerMemberName;
 554                                                         }
 555                                                 } else if (value == Missing.Value) {
 556                                                         default_value = EmptyExpression.MissingValue;
 557                                                 } else if (value == null) {
 558                                                         default_value = new DefaultValueExpression (new TypeExpression (ptype, Location.Null), Location.Null);
 559                                                 } else if (ptype.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 560                                                         default_value = ImportParameterConstant (value);
 561                                                 }
 562                                         }
 563                                 }
 564
 565                                 par[i] = new ParameterData (p.Name, mod, default_value);
 566                         }
 567
 568                         if (varargs != 0) {
 569                                 par[par.Length - 1] = new ArglistParameter (Location.Null);
 570                                 types[types.Length - 1] = InternalType.Arglist;
 571                         }
 572
 573                         return method != null ?
 574                                 new ParametersImported (par, types, varargs != 0, is_params) :
 575                                 new ParametersImported (par, types, is_params);
 576                 }
 577
 578                 //
 579                 // Returns null when the property is not valid C# property
 580                 //
 581                 public PropertySpec CreateProperty (PropertyInfo pi, TypeSpec declaringType, MethodSpec get, MethodSpec set)
 582                 {
 583                         Modifiers mod = 0;
 584                         AParametersCollection param = null;
 585                         TypeSpec type = null;
 586                         if (get != null) {
 587                                 mod = get.Modifiers;
 588                                 param = get.Parameters;
 589                                 type = get.ReturnType;
 590                         }
 591
 592                         bool is_valid_property = true;
 593                         if (set != null) {
 594                                 if (set.ReturnType.Kind != MemberKind.Void)
 595                                         is_valid_property = false;
 596
 597                                 var set_param_count = set.Parameters.Count - 1;
 598
 599                                 if (set_param_count < 0) {
 600                                         set_param_count = 0;
 601                                         is_valid_property = false;
 602                                 }
 603
 604                                 var set_type = set.Parameters.Types[set_param_count];
 605
 606                                 if (mod == 0) {
 607                                         AParametersCollection set_based_param;
 608
 609                                         if (set_param_count == 0) {
 610                                                 set_based_param = ParametersCompiled.EmptyReadOnlyParameters;
 611                                         } else {
 612                                                 //
 613                                                 // Create indexer parameters based on setter method parameters (the last parameter has to be removed)
 614                                                 //
 615                                                 var data = new IParameterData[set_param_count];
 616                                                 var types = new TypeSpec[set_param_count];
 617                                                 Array.Copy (set.Parameters.FixedParameters, data, set_param_count);
 618                                                 Array.Copy (set.Parameters.Types, types, set_param_count);
 619                                                 set_based_param = new ParametersImported (data, types, set.Parameters.HasParams);
 620                                         }
 621
 622                                         mod = set.Modifiers;
 623                                         param = set_based_param;
 624                                         type = set_type;
 625                                 } else {
 626                                         if (set_param_count != get.Parameters.Count)
 627                                                 is_valid_property = false;
 628
 629                                         if (get.ReturnType != set_type)
 630                                                 is_valid_property = false;
 631
 632                                         // Possible custom accessor modifiers
 633                                         if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
 634                                                 var get_acc = mod & Modifiers.AccessibilityMask;
 635                                                 if (get_acc != Modifiers.PUBLIC) {
 636                                                         var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
 637                                                         // If the accessor modifiers are not same, do extra restriction checks
 638                                                         if (get_acc != set_acc) {
 639                                                                 var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
 640                                                                 var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
 641                                                                 if (get_restr && set_restr) {
 642                                                                         is_valid_property = false; // Neither is more restrictive
 643                                                                 }
 644
 645                                                                 if (get_restr) {
 646                                                                         mod &= ~Modifiers.AccessibilityMask;
 647                                                                         mod |= set_acc;
 648                                                                 }
 649                                                         }
 650                                                 }
 651                                         }
 652                                 }
 653                         }
 654
 655                         PropertySpec spec = null;
 656                         if (!param.IsEmpty) {
 657                                 if (is_valid_property) {
 658                                         var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
 659                                         if (index_name == null) {
 660                                                 is_valid_property = false;
 661                                         } else {
 662                                                 if (get != null) {
 663                                                         if (get.IsStatic)
 664                                                                 is_valid_property = false;
 665                                                         if (get.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 666                                                                 is_valid_property = false;
 667                                                 }
 668                                                 if (set != null) {
 669                                                         if (set.IsStatic)
 670                                                                 is_valid_property = false;
 671                                                         if (set.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
 672                                                                 is_valid_property = false;
 673                                                 }
 674                                         }
 675
 676                                         if (is_valid_property) {
 677                                                 spec = new IndexerSpec (declaringType, new ImportedParameterMemberDefinition (pi, type, param, this), type, param, pi, mod);
 678                                         } else if (declaringType.MemberDefinition.IsComImport && param.FixedParameters[0].HasDefaultValue) {
 679                                                 //
 680                                                 // Enables support for properties with parameters (must have default value) of COM-imported types
 681                                                 //
 682                                                 is_valid_property = true;
 683
 684                                                 for (int i = 0; i < param.FixedParameters.Length; ++i) {
 685                                                         if (!param.FixedParameters[i].HasDefaultValue) {
 686                                                                 is_valid_property = false;
 687                                                                 break;
 688                                                         }
 689                                                 }
 690                                         }
 691                                 }
 692                         }
 693
 694                         if (spec == null)
 695                                 spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi, type, this), type, pi, mod);
 696
 697                         if (!is_valid_property) {
 698                                 spec.IsNotCSharpCompatible = true;
 699                                 return spec;
 700                         }
 701
 702                         if (set != null)
 703                                 spec.Set = set;
 704                         if (get != null)
 705                                 spec.Get = get;
 706
 707                         return spec;
 708                 }
 709
 710                 public TypeSpec CreateType (MetaType type)
 711                 {
 712                         return CreateType (type, new DynamicTypeReader (), true);
 713                 }
 714
 715                 public TypeSpec CreateNestedType (MetaType type, TypeSpec declaringType)
 716                 {
 717                         return CreateType (type, declaringType, new DynamicTypeReader (type), false);
 718                 }
 719
 720                 TypeSpec CreateType (MetaType type, DynamicTypeReader dtype, bool canImportBaseType)
 721                 {
 722                         TypeSpec declaring_type;
 723                         if (type.IsNested && !type.IsGenericParameter)
 724                                 declaring_type = CreateType (type.DeclaringType, new DynamicTypeReader (type.DeclaringType), true);
 725                         else
 726                                 declaring_type = null;
 727
 728                         return CreateType (type, declaring_type, dtype, canImportBaseType);
 729                 }
 730
 731                 protected TypeSpec CreateType (MetaType type, TypeSpec declaringType, DynamicTypeReader dtype, bool canImportBaseType)
 732                 {
 733                         TypeSpec spec;
 734                         if (import_cache.TryGetValue (type, out spec)) {
 735                                 if (spec.BuiltinType == BuiltinTypeSpec.Type.Object) {
 736                                         if (dtype.IsDynamicObject ())
 737                                                 return module.Compiler.BuiltinTypes.Dynamic;
 738
 739                                         return spec;
 740                                 }
 741
 742                                 if (!spec.IsGeneric || type.IsGenericTypeDefinition)
 743                                         return spec;
 744
 745                                 if (!dtype.HasDynamicAttribute ())
 746                                         return spec;
 747
 748                                 // We've found same object in the cache but this one has a dynamic custom attribute
 749                                 // and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
 750                                 // Do type resolve process again in that case
 751
 752                                 // TODO: Handle cases where they still unify
 753                         }
 754
 755                         if (IsMissingType (type)) {
 756                                 spec = new TypeSpec (MemberKind.MissingType, declaringType, new ImportedTypeDefinition (type, this), type, Modifiers.PUBLIC);
 757                                 spec.MemberCache = MemberCache.Empty;
 758                                 import_cache.Add (type, spec);
 759                                 return spec;
 760                         }
 761
 762                         if (type.IsGenericType && !type.IsGenericTypeDefinition) {
 763                                 var type_def = type.GetGenericTypeDefinition ();
 764
 765                                 // Generic type definition can also be forwarded
 766                                 if (compiled_types.TryGetValue (type_def, out spec))
 767                                         return spec;
 768
 769                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 770                                 if (targs == null)
 771                                         return null;
 772                                 if (declaringType == null) {
 773                                         // Simple case, no nesting
 774                                         spec = CreateType (type_def, null, new DynamicTypeReader (), canImportBaseType);
 775                                         spec = spec.MakeGenericType (module, targs);
 776                                 } else {
 777                                         //
 778                                         // Nested type case, converting .NET types like
 779                                         // A`1.B`1.C`1<int, long, string> to typespec like
 780                                         // A<int>.B<long>.C<string>
 781                                         //
 782                                         var nested_hierarchy = new List<TypeSpec> ();
 783                                         while (declaringType.IsNested) {
 784                                                 nested_hierarchy.Add (declaringType);
 785                                                 declaringType = declaringType.DeclaringType;
 786                                         }
 787
 788                                         int targs_pos = 0;
 789                                         if (declaringType.Arity > 0) {
 790                                                 spec = declaringType.MakeGenericType (module, targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
 791                                                 targs_pos = spec.Arity;
 792                                         } else {
 793                                                 spec = declaringType;
 794                                         }
 795
 796                                         for (int i = nested_hierarchy.Count; i != 0; --i) {
 797                                                 var t = nested_hierarchy [i - 1];
 798                                                 if (t.Kind == MemberKind.MissingType)
 799                                                         spec = t;
 800                                                 else
 801                                                         spec = MemberCache.FindNestedType (spec, t.Name, t.Arity);
 802
 803                                                 if (t.Arity > 0) {
 804                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
 805                                                         targs_pos += t.Arity;
 806                                                 }
 807                                         }
 808
 809                                         if (spec.Kind == MemberKind.MissingType) {
 810                                                 spec = new TypeSpec (MemberKind.MissingType, spec, new ImportedTypeDefinition (type_def, this), type_def, Modifiers.PUBLIC);
 811                                                 spec.MemberCache = MemberCache.Empty;
 812                                         } else {
 813                                                 if ((type_def.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && IgnorePrivateMembers)
 814                                                         return null;
 815
 816                                                 string name = type.Name;
 817                                                 int index = name.IndexOf ('`');
 818                                                 if (index > 0)
 819                                                         name = name.Substring (0, index);
 820
 821                                                 spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos);
 822
 823                                                 if (spec.Arity > 0) {
 824                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).ToArray ());
 825                                                 }
 826                                         }
 827                                 }
 828
 829                                 // Don't add generic type with dynamic arguments, they can interfere with same type
 830                                 // using object type arguments
 831                                 if (!spec.HasDynamicElement) {
 832
 833                                         // Add to reading cache to speed up reading
 834                                         if (!import_cache.ContainsKey (type))
 835                                                 import_cache.Add (type, spec);
 836                                 }
 837
 838                                 return spec;
 839                         }
 840
 841                         Modifiers mod;
 842                         MemberKind kind;
 843
 844                         var ma = type.Attributes;
 845                         switch (ma & TypeAttributes.VisibilityMask) {
 846                         case TypeAttributes.Public:
 847                         case TypeAttributes.NestedPublic:
 848                                 mod = Modifiers.PUBLIC;
 849                                 break;
 850                         case TypeAttributes.NestedPrivate:
 851                                 mod = Modifiers.PRIVATE;
 852                                 break;
 853                         case TypeAttributes.NestedFamily:
 854                                 mod = Modifiers.PROTECTED;
 855                                 break;
 856                         case TypeAttributes.NestedFamORAssem:
 857                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 858                                 break;
 859                         default:
 860                                 mod = Modifiers.INTERNAL;
 861                                 break;
 862                         }
 863
 864                         if ((ma & TypeAttributes.Interface) != 0) {
 865                                 kind = MemberKind.Interface;
 866                         } else if (type.IsGenericParameter) {
 867                                 kind = MemberKind.TypeParameter;
 868                         } else {
 869                                 var base_type = type.BaseType;
 870                                 if (base_type == null || (ma & TypeAttributes.Abstract) != 0) {
 871                                         kind = MemberKind.Class;
 872                                 } else {
 873                                         kind = DetermineKindFromBaseType (base_type);
 874                                         if (kind == MemberKind.Struct || kind == MemberKind.Delegate) {
 875                                                 mod |= Modifiers.SEALED;
 876                                         }
 877                                 }
 878
 879                                 if (kind == MemberKind.Class) {
 880                                         if ((ma & TypeAttributes.Sealed) != 0) {
 881                                                 if ((ma & TypeAttributes.Abstract) != 0)
 882                                                         mod |= Modifiers.STATIC;
 883                                                 else
 884                                                         mod |= Modifiers.SEALED;
 885                                         } else if ((ma & TypeAttributes.Abstract) != 0) {
 886                                                 mod |= Modifiers.ABSTRACT;
 887                                         }
 888                                 }
 889                         }
 890
 891                         var definition = new ImportedTypeDefinition (type, this);
 892                         TypeSpec pt;
 893
 894                         if (kind == MemberKind.Enum) {
 895                                 const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
 896                                         BindingFlags.Instance |
 897                                         BindingFlags.Public | BindingFlags.NonPublic;
 898
 899                                 var type_members = type.GetFields (underlying_member);
 900                                 foreach (var type_member in type_members) {
 901                                         spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
 902                                         break;
 903                                 }
 904
 905                                 if (spec == null)
 906                                         kind = MemberKind.Class;
 907
 908                         } else if (kind == MemberKind.TypeParameter) {
 909                                 spec = CreateTypeParameter (type, declaringType);
 910                         } else if (type.IsGenericTypeDefinition) {
 911                                 definition.TypeParameters = CreateGenericParameters (type, declaringType);
 912                         } else if (compiled_types.TryGetValue (type, out pt)) {
 913                                 //
 914                                 // Same type was found in inside compiled types. It's
 915                                 // either build-in type or forward referenced typed
 916                                 // which point into just compiled assembly.
 917                                 //
 918                                 spec = pt;
 919                                 BuiltinTypeSpec bts = pt as BuiltinTypeSpec;
 920                                 if (bts != null)
 921                                         bts.SetDefinition (definition, type, mod);
 922                         }
 923
 924                         if (spec == null)
 925                                 spec = new TypeSpec (kind, declaringType, definition, type, mod);
 926
 927                         import_cache.Add (type, spec);
 928
 929                         if (kind == MemberKind.TypeParameter) {
 930                                 if (canImportBaseType)
 931                                         ImportTypeParameterTypeConstraints ((TypeParameterSpec) spec, type);
 932
 933                                 return spec;
 934                         }
 935
 936                         //
 937                         // Two stage setup as the base type can be inflated declaring type or
 938                         // another nested type inside same declaring type which has not been
 939                         // loaded, therefore we can import a base type of nested types once
 940                         // the types have been imported
 941                         //
 942                         if (canImportBaseType)
 943                                 ImportTypeBase (spec, type);
 944
 945                         return spec;
 946                 }
 947
 948                 public IAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
 949                 {
 950                         IAssemblyDefinition found;
 951                         if (!assembly_2_definition.TryGetValue (assembly, out found)) {
 952
 953                                 // This can happen in dynamic context only
 954                                 var def = new ImportedAssemblyDefinition (assembly);
 955                                 assembly_2_definition.Add (assembly, def);
 956                                 def.ReadAttributes ();
 957                                 found = def;
 958                         }
 959
 960                         return found;
 961                 }
 962
 963                 public void ImportTypeBase (MetaType type)
 964                 {
 965                         TypeSpec spec = import_cache[type];
 966                         if (spec != null)
 967                                 ImportTypeBase (spec, type);
 968                 }
 969
 970                 TypeParameterSpec CreateTypeParameter (MetaType type, TypeSpec declaringType)
 971                 {
 972                         Variance variance;
 973                         switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
 974                         case GenericParameterAttributes.Covariant:
 975                                 variance = Variance.Covariant;
 976                                 break;
 977                         case GenericParameterAttributes.Contravariant:
 978                                 variance = Variance.Contravariant;
 979                                 break;
 980                         default:
 981                                 variance = Variance.None;
 982                                 break;
 983                         }
 984
 985                         SpecialConstraint special = SpecialConstraint.None;
 986                         var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
 987
 988                         if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
 989                                 special |= SpecialConstraint.Struct;
 990                         } else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
 991                                 special = SpecialConstraint.Constructor;
 992                         }
 993
 994                         if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
 995                                 special |= SpecialConstraint.Class;
 996                         }
 997
 998                         TypeParameterSpec spec;
 999                         var def = new ImportedTypeParameterDefinition (type, this);
1000                         if (type.DeclaringMethod != null) {
1001                                 spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
1002                         } else {
1003                                 spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
1004                         }
1005
1006                         return spec;
1007                 }
1008
1009                 //
1010                 // Test for a custom attribute type match. Custom attributes are not really predefined globaly
1011                 // they can be assembly specific therefore we do check based on names only
1012                 //
1013                 public static bool HasAttribute (IList<CustomAttributeData> attributesData, string attrName, string attrNamespace)
1014                 {
1015                         if (attributesData.Count == 0)
1016                                 return false;
1017
1018                         foreach (var attr in attributesData) {
1019                                 var dt = attr.Constructor.DeclaringType;
1020                                 if (dt.Name == attrName && dt.Namespace == attrNamespace)
1021                                         return true;
1022                         }
1023
1024                         return false;
1025                 }
1026
1027                 void ImportTypeBase (TypeSpec spec, MetaType type)
1028                 {
1029                         if (spec.Kind == MemberKind.Interface)
1030                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1031                         else if (type.BaseType != null) {
1032                                 TypeSpec base_type;
1033                                 if (!IsMissingType (type.BaseType) && type.BaseType.IsGenericType)
1034                                         base_type = CreateType (type.BaseType, new DynamicTypeReader (type), true);
1035                                 else
1036                                         base_type = CreateType (type.BaseType);
1037
1038                                 spec.BaseType = base_type;
1039                         }
1040
1041                         if (spec.MemberDefinition.TypeParametersCount > 0) {
1042                                 foreach (var tp in spec.MemberDefinition.TypeParameters) {
1043                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
1044                                 }
1045                         }
1046                 }
1047
1048                 protected void ImportTypes (MetaType[] types, Namespace targetNamespace, bool importExtensionTypes)
1049                 {
1050                         Namespace ns = targetNamespace;
1051                         string prev_namespace = null;
1052                         foreach (var t in types) {
1053                                 if (t == null)
1054                                         continue;
1055
1056                                 // Be careful not to trigger full parent type loading
1057                                 if (t.MemberType == MemberTypes.NestedType)
1058                                         continue;
1059
1060                                 if (t.Name[0] == '<')
1061                                         continue;
1062
1063                                 var it = CreateType (t, null, new DynamicTypeReader (t), true);
1064                                 if (it == null)
1065                                         continue;
1066
1067                                 if (prev_namespace != t.Namespace) {
1068                                         ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
1069                                         prev_namespace = t.Namespace;
1070                                 }
1071
1072                                 // Cannot rely on assembly level Extension attribute or static modifier because they
1073                                 // are not followed by other compilers (e.g. F#).
1074                                 if (it.IsClass && it.Arity == 0 && importExtensionTypes &&
1075                                         HasAttribute (CustomAttributeData.GetCustomAttributes (t), "ExtensionAttribute", CompilerServicesNamespace)) {
1076                                         it.SetExtensionMethodContainer ();
1077                                 }
1078
1079                                 ns.AddType (module, it);
1080                         }
1081                 }
1082
1083                 void ImportTypeParameterTypeConstraints (TypeParameterSpec spec, MetaType type)
1084                 {
1085                         var constraints = type.GetGenericParameterConstraints ();
1086                         List<TypeSpec> tparams = null;
1087                         foreach (var ct in constraints) {
1088                                 if (ct.IsGenericParameter) {
1089                                         if (tparams == null)
1090                                                 tparams = new List<TypeSpec> ();
1091
1092                                         tparams.Add (CreateType (ct));
1093                                         continue;
1094                                 }
1095
1096                                 var constraint_type = CreateType (ct);
1097                                 if (constraint_type.IsClass) {
1098                                         spec.BaseType = constraint_type;
1099                                         continue;
1100                                 }
1101
1102                                 spec.AddInterface (constraint_type);
1103                         }
1104
1105                         if (spec.BaseType == null)
1106                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1107
1108                         if (tparams != null)
1109                                 spec.TypeArguments = tparams.ToArray ();
1110                 }
1111
1112                 Constant ImportParameterConstant (object value)
1113                 {
1114                         //
1115                         // Get type of underlying value as int constant can be used for object
1116                         // parameter type. This is not allowed in C# but other languages can do that
1117                         //
1118                         var types = module.Compiler.BuiltinTypes;
1119                         switch (System.Type.GetTypeCode (value.GetType ())) {
1120                         case TypeCode.Boolean:
1121                                 return new BoolConstant (types, (bool) value, Location.Null);
1122                         case TypeCode.Byte:
1123                                 return new ByteConstant (types, (byte) value, Location.Null);
1124                         case TypeCode.Char:
1125                                 return new CharConstant (types, (char) value, Location.Null);
1126                         case TypeCode.Decimal:
1127                                 return new DecimalConstant (types, (decimal) value, Location.Null);
1128                         case TypeCode.Double:
1129                                 return new DoubleConstant (types, (double) value, Location.Null);
1130                         case TypeCode.Int16:
1131                                 return new ShortConstant (types, (short) value, Location.Null);
1132                         case TypeCode.Int32:
1133                                 return new IntConstant (types, (int) value, Location.Null);
1134                         case TypeCode.Int64:
1135                                 return new LongConstant (types, (long) value, Location.Null);
1136                         case TypeCode.SByte:
1137                                 return new SByteConstant (types, (sbyte) value, Location.Null);
1138                         case TypeCode.Single:
1139                                 return new FloatConstant (types, (float) value, Location.Null);
1140                         case TypeCode.String:
1141                                 return new StringConstant (types, (string) value, Location.Null);
1142                         case TypeCode.UInt16:
1143                                 return new UShortConstant (types, (ushort) value, Location.Null);
1144                         case TypeCode.UInt32:
1145                                 return new UIntConstant (types, (uint) value, Location.Null);
1146                         case TypeCode.UInt64:
1147                                 return new ULongConstant (types, (ulong) value, Location.Null);
1148                         }
1149
1150                         throw new NotImplementedException (value.GetType ().ToString ());
1151                 }
1152
1153                 public TypeSpec ImportType (MetaType type)
1154                 {
1155                         return ImportType (type, new DynamicTypeReader (type));
1156                 }
1157
1158                 TypeSpec ImportType (MetaType type, DynamicTypeReader dtype)
1159                 {
1160                         if (type.HasElementType) {
1161                                 var element = type.GetElementType ();
1162                                 ++dtype.Position;
1163                                 var spec = ImportType (element, dtype);
1164
1165                                 if (type.IsArray)
1166                                         return ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
1167                                 if (type.IsByRef)
1168                                         return ReferenceContainer.MakeType (module, spec);
1169                                 if (type.IsPointer)
1170                                         return PointerContainer.MakeType (module, spec);
1171
1172                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
1173                         }
1174
1175                         TypeSpec compiled_type;
1176                         if (compiled_types.TryGetValue (type, out compiled_type)) {
1177                                 if (compiled_type.BuiltinType == BuiltinTypeSpec.Type.Object && dtype.IsDynamicObject ())
1178                                         return module.Compiler.BuiltinTypes.Dynamic;
1179
1180                                 return compiled_type;
1181                         }
1182
1183                         return CreateType (type, dtype, true);
1184                 }
1185
1186                 static bool IsMissingType (MetaType type)
1187                 {
1188 #if STATIC
1189                         return type.__IsMissing;
1190 #else
1191                         return false;
1192 #endif
1193                 }
1194
1195                 //
1196                 // Decimal constants cannot be encoded in the constant blob, and thus are marked
1197                 // as IsInitOnly ('readonly' in C# parlance).  We get its value from the
1198                 // DecimalConstantAttribute metadata.
1199                 //
1200                 Constant ReadDecimalConstant (IList<CustomAttributeData> attrs)
1201                 {
1202                         if (attrs.Count == 0)
1203                                 return null;
1204
1205                         foreach (var ca in attrs) {
1206                                 var dt = ca.Constructor.DeclaringType;
1207                                 if (dt.Name != "DecimalConstantAttribute" || dt.Namespace != CompilerServicesNamespace)
1208                                         continue;
1209
1210                                 var value = new decimal (
1211                                         (int) (uint) ca.ConstructorArguments[4].Value,
1212                                         (int) (uint) ca.ConstructorArguments[3].Value,
1213                                         (int) (uint) ca.ConstructorArguments[2].Value,
1214                                         (byte) ca.ConstructorArguments[1].Value != 0,
1215                                         (byte) ca.ConstructorArguments[0].Value);
1216
1217                                 return new DecimalConstant (module.Compiler.BuiltinTypes, value, Location.Null);
1218                         }
1219
1220                         return null;
1221                 }
1222
1223                 static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
1224                 {
1225                         Modifiers mod;
1226                         var ma = mb.Attributes;
1227                         switch (ma & MethodAttributes.MemberAccessMask) {
1228                         case MethodAttributes.Public:
1229                                 mod = Modifiers.PUBLIC;
1230                                 break;
1231                         case MethodAttributes.Assembly:
1232                                 mod = Modifiers.INTERNAL;
1233                                 break;
1234                         case MethodAttributes.Family:
1235                                 mod = Modifiers.PROTECTED;
1236                                 break;
1237                         case MethodAttributes.FamORAssem:
1238                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
1239                                 break;
1240                         default:
1241                                 mod = Modifiers.PRIVATE;
1242                                 break;
1243                         }
1244
1245                         if ((ma & MethodAttributes.Static) != 0) {
1246                                 mod |= Modifiers.STATIC;
1247                                 return mod;
1248                         }
1249                         if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
1250                                 mod |= Modifiers.ABSTRACT;
1251                                 return mod;
1252                         }
1253
1254                         // It can be sealed and override
1255                         if ((ma & MethodAttributes.Final) != 0)
1256                                 mod |= Modifiers.SEALED;
1257
1258                         if ((ma & MethodAttributes.Virtual) != 0) {
1259                                 // Not every member can be detected based on MethodAttribute, we
1260                                 // set virtual or non-virtual only when we are certain. Further checks
1261                                 // to really find out what `virtual' means for this member are done
1262                                 // later
1263                                 if ((ma & MethodAttributes.NewSlot) != 0) {
1264                                         if ((mod & Modifiers.SEALED) != 0) {
1265                                                 mod &= ~Modifiers.SEALED;
1266                                         } else {
1267                                                 mod |= Modifiers.VIRTUAL;
1268                                         }
1269                                 } else {
1270                                         mod |= Modifiers.OVERRIDE;
1271                                 }
1272                         }
1273
1274                         return mod;
1275                 }
1276         }
1277
1278         abstract class ImportedDefinition : IMemberDefinition
1279         {
1280                 protected class AttributesBag
1281                 {
1282                         public static readonly AttributesBag Default = new AttributesBag ();
1283
1284                         public AttributeUsageAttribute AttributeUsage;
1285                         public ObsoleteAttribute Obsolete;
1286                         public string[] Conditionals;
1287                         public string DefaultIndexerName;
1288                         public bool? CLSAttributeValue;
1289                         public TypeSpec CoClass;
1290
1291                         static bool HasMissingType (ConstructorInfo ctor)
1292                         {
1293 #if STATIC
1294                                 //
1295                                 // Mimic odd csc behaviour where missing type on predefined
1296                                 // attributes means the attribute is silently ignored. This can
1297                                 // happen with PCL facades
1298                                 //
1299                                 foreach (var p in ctor.GetParameters ()) {
1300                                         if (p.ParameterType.__ContainsMissingType)
1301                                                 return true;
1302                                 }
1303 #endif
1304
1305                                 return false;
1306                         }
1307
1308                         public static AttributesBag Read (MemberInfo mi, MetadataImporter importer)
1309                         {
1310                                 AttributesBag bag = null;
1311                                 List<string> conditionals = null;
1312
1313                                 // It should not throw any loading exception
1314                                 IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
1315
1316                                 foreach (var a in attrs) {
1317                                         var dt = a.Constructor.DeclaringType;
1318                                         string name = dt.Name;
1319                                         if (name == "ObsoleteAttribute") {
1320                                                 if (dt.Namespace != "System")
1321                                                         continue;
1322
1323                                                 if (bag == null)
1324                                                         bag = new AttributesBag ();
1325
1326                                                 var args = a.ConstructorArguments;
1327
1328                                                 if (args.Count == 1) {
1329                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
1330                                                 } else if (args.Count == 2) {
1331                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
1332                                                 } else {
1333                                                         bag.Obsolete = new ObsoleteAttribute ();
1334                                                 }
1335
1336                                                 continue;
1337                                         }
1338
1339                                         if (name == "ConditionalAttribute") {
1340                                                 if (dt.Namespace != "System.Diagnostics")
1341                                                         continue;
1342
1343                                                 if (bag == null)
1344                                                         bag = new AttributesBag ();
1345
1346                                                 if (conditionals == null)
1347                                                         conditionals = new List<string> (2);
1348
1349                                                 conditionals.Add ((string) a.ConstructorArguments[0].Value);
1350                                                 continue;
1351                                         }
1352
1353                                         if (name == "CLSCompliantAttribute") {
1354                                                 if (dt.Namespace != "System")
1355                                                         continue;
1356
1357                                                 if (bag == null)
1358                                                         bag = new AttributesBag ();
1359
1360                                                 bag.CLSAttributeValue = (bool) a.ConstructorArguments[0].Value;
1361                                                 continue;
1362                                         }
1363
1364                                         // Type only attributes
1365                                         if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
1366                                                 if (name == "DefaultMemberAttribute") {
1367                                                         if (dt.Namespace != "System.Reflection")
1368                                                                 continue;
1369
1370                                                         if (bag == null)
1371                                                                 bag = new AttributesBag ();
1372
1373                                                         bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
1374                                                         continue;
1375                                                 }
1376
1377                                                 if (name == "AttributeUsageAttribute") {
1378                                                         if (dt.Namespace != "System")
1379                                                                 continue;
1380
1381                                                         if (HasMissingType (a.Constructor))
1382                                                                 continue;
1383
1384                                                         if (bag == null)
1385                                                                 bag = new AttributesBag ();
1386
1387                                                         bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
1388                                                         foreach (var named in a.NamedArguments) {
1389                                                                 if (named.MemberInfo.Name == "AllowMultiple")
1390                                                                         bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
1391                                                                 else if (named.MemberInfo.Name == "Inherited")
1392                                                                         bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
1393                                                         }
1394                                                         continue;
1395                                                 }
1396
1397                                                 // Interface only attribute
1398                                                 if (name == "CoClassAttribute") {
1399                                                         if (dt.Namespace != "System.Runtime.InteropServices")
1400                                                                 continue;
1401
1402                                                         if (HasMissingType (a.Constructor))
1403                                                                 continue;
1404
1405                                                         if (bag == null)
1406                                                                 bag = new AttributesBag ();
1407
1408                                                         bag.CoClass = importer.ImportType ((MetaType) a.ConstructorArguments[0].Value);
1409                                                         continue;
1410                                                 }
1411                                         }
1412                                 }
1413
1414                                 if (bag == null)
1415                                         return Default;
1416
1417                                 if (conditionals != null)
1418                                         bag.Conditionals = conditionals.ToArray ();
1419
1420                                 return bag;
1421                         }
1422                 }
1423
1424                 protected readonly MemberInfo provider;
1425                 protected AttributesBag cattrs;
1426                 protected readonly MetadataImporter importer;
1427
1428                 protected ImportedDefinition (MemberInfo provider, MetadataImporter importer)
1429                 {
1430                         this.provider = provider;
1431                         this.importer = importer;
1432                 }
1433
1434                 #region Properties
1435
1436                 public bool IsImported {
1437                         get {
1438                                 return true;
1439                         }
1440                 }
1441
1442                 public virtual string Name {
1443                         get {
1444                                 return provider.Name;
1445                         }
1446                 }
1447
1448                 #endregion
1449
1450                 public string[] ConditionalConditions ()
1451                 {
1452                         if (cattrs == null)
1453                                 ReadAttributes ();
1454
1455                         return cattrs.Conditionals;
1456                 }
1457
1458                 public ObsoleteAttribute GetAttributeObsolete ()
1459                 {
1460                         if (cattrs == null)
1461                                 ReadAttributes ();
1462
1463                         return cattrs.Obsolete;
1464                 }
1465
1466                 public bool? CLSAttributeValue {
1467                         get {
1468                                 if (cattrs == null)
1469                                         ReadAttributes ();
1470
1471                                 return cattrs.CLSAttributeValue;
1472                         }
1473                 }
1474
1475                 protected void ReadAttributes ()
1476                 {
1477                         cattrs = AttributesBag.Read (provider, importer);
1478                 }
1479
1480                 public void SetIsAssigned ()
1481                 {
1482                         // Unused for imported members
1483                 }
1484
1485                 public void SetIsUsed ()
1486                 {
1487                         // Unused for imported members
1488                 }
1489         }
1490
1491         public class ImportedModuleDefinition
1492         {
1493                 readonly Module module;
1494                 bool cls_compliant;
1495
1496                 public ImportedModuleDefinition (Module module)
1497                 {
1498                         this.module = module;
1499                 }
1500
1501                 #region Properties
1502
1503                 public bool IsCLSCompliant {
1504                         get {
1505                                 return cls_compliant;
1506                         }
1507                 }
1508
1509                 public string Name {
1510                         get {
1511                                 return module.Name;
1512                         }
1513                 }
1514
1515                 #endregion
1516
1517                 public void ReadAttributes ()
1518                 {
1519                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
1520
1521                         foreach (var a in attrs) {
1522                                 var dt = a.Constructor.DeclaringType;
1523                                 if (dt.Name == "CLSCompliantAttribute") {
1524                                         if (dt.Namespace != "System")
1525                                                 continue;
1526
1527                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1528                                         continue;
1529                                 }
1530                         }
1531                 }
1532
1533                 //
1534                 // Reads assembly attributes which where attached to a special type because
1535                 // module does have assembly manifest
1536                 //
1537                 public List<Attribute> ReadAssemblyAttributes ()
1538                 {
1539                         var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
1540                         if (t == null)
1541                                 return null;
1542
1543                         var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
1544                         if (field == null)
1545                                 return null;
1546
1547                         // TODO: implement, the idea is to fabricate specil Attribute class and
1548                         // add it to OptAttributes before resolving the source code attributes
1549                         // Need to build module location as well for correct error reporting
1550
1551                         //var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
1552                         //var attrs = new List<Attribute> (assembly_attributes.Count);
1553                         //foreach (var a in assembly_attributes)
1554                         //{
1555                         //    var type = metaImporter.ImportType (a.Constructor.DeclaringType);
1556                         //    var ctor = metaImporter.CreateMethod (a.Constructor, type);
1557
1558                         //    foreach (var carg in a.ConstructorArguments) {
1559                         //        carg.Value
1560                         //    }
1561
1562                         //    attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
1563                         //}
1564
1565                         return null;
1566                 }
1567         }
1568
1569         public class ImportedAssemblyDefinition : IAssemblyDefinition
1570         {
1571                 readonly Assembly assembly;
1572                 readonly AssemblyName aname;
1573                 bool cls_compliant;
1574
1575                 List<AssemblyName> internals_visible_to;
1576                 Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
1577
1578                 public ImportedAssemblyDefinition (Assembly assembly)
1579                 {
1580                         this.assembly = assembly;
1581                         this.aname = assembly.GetName ();
1582                 }
1583
1584                 #region Properties
1585
1586                 public Assembly Assembly {
1587                         get {
1588                                 return assembly;
1589                         }
1590                 }
1591
1592                 public string FullName {
1593                         get {
1594                                 return aname.FullName;
1595                         }
1596                 }
1597
1598                 public bool HasStrongName {
1599                         get {
1600                                 return aname.GetPublicKey ().Length != 0;
1601                         }
1602                 }
1603
1604                 public bool IsMissing {
1605                         get {
1606 #if STATIC
1607                                 return assembly.__IsMissing;
1608 #else
1609                                 return false;
1610 #endif
1611                         }
1612                 }
1613
1614                 public bool IsCLSCompliant {
1615                         get {
1616                                 return cls_compliant;
1617                         }
1618                 }
1619
1620                 public string Location {
1621                         get {
1622                                 return assembly.Location;
1623                         }
1624                 }
1625
1626                 public string Name {
1627                         get {
1628                                 return aname.Name;
1629                         }
1630                 }
1631
1632                 #endregion
1633
1634                 public byte[] GetPublicKeyToken ()
1635                 {
1636                         return aname.GetPublicKeyToken ();
1637                 }
1638
1639                 public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
1640                 {
1641                         return internals_visible_to_cache [assembly];
1642                 }
1643
1644                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1645                 {
1646                         if (internals_visible_to == null)
1647                                 return false;
1648
1649                         AssemblyName is_visible = null;
1650                         if (internals_visible_to_cache == null) {
1651                                 internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
1652                         } else {
1653                                 if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
1654                                         return is_visible != null;
1655                         }
1656
1657                         var token = assembly.GetPublicKeyToken ();
1658                         if (token != null && token.Length == 0)
1659                                 token = null;
1660
1661                         foreach (var internals in internals_visible_to) {
1662                                 if (internals.Name != assembly.Name)
1663                                         continue;
1664
1665                                 if (token == null && assembly is AssemblyDefinition) {
1666                                         is_visible = internals;
1667                                         break;
1668                                 }
1669
1670                                 if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
1671                                         continue;
1672
1673                                 is_visible = internals;
1674                                 break;
1675                         }
1676
1677                         internals_visible_to_cache.Add (assembly, is_visible);
1678                         return is_visible != null;
1679                 }
1680
1681                 public void ReadAttributes ()
1682                 {
1683 #if STATIC
1684                         if (assembly.__IsMissing)
1685                                 return;
1686 #endif
1687
1688                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
1689
1690                         foreach (var a in attrs) {
1691                                 var dt = a.Constructor.DeclaringType;
1692                                 var name = dt.Name;
1693                                 if (name == "CLSCompliantAttribute") {
1694                                         if (dt.Namespace == "System") {
1695                                                 cls_compliant = (bool) a.ConstructorArguments[0].Value;
1696                                         }
1697                                         continue;
1698                                 }
1699
1700                                 if (name == "InternalsVisibleToAttribute") {
1701                                         if (dt.Namespace != MetadataImporter.CompilerServicesNamespace)
1702                                                 continue;
1703
1704                                         string s = a.ConstructorArguments[0].Value as string;
1705                                         if (s == null)
1706                                                 continue;
1707
1708                                         var an = new AssemblyName (s);
1709                                         if (internals_visible_to == null)
1710                                                 internals_visible_to = new List<AssemblyName> ();
1711
1712                                         internals_visible_to.Add (an);
1713                                         continue;
1714                                 }
1715                         }
1716                 }
1717
1718                 public override string ToString ()
1719                 {
1720                         return FullName;
1721                 }
1722         }
1723
1724         class ImportedMemberDefinition : ImportedDefinition
1725         {
1726                 readonly TypeSpec type;
1727
1728                 public ImportedMemberDefinition (MemberInfo member, TypeSpec type, MetadataImporter importer)
1729                         : base (member, importer)
1730                 {
1731                         this.type = type;
1732                 }
1733
1734                 #region Properties
1735
1736                 public TypeSpec MemberType {
1737                         get {
1738                                 return type;
1739                         }
1740                 }
1741
1742                 #endregion
1743         }
1744
1745         class ImportedParameterMemberDefinition : ImportedMemberDefinition, IParametersMember
1746         {
1747                 readonly AParametersCollection parameters;
1748
1749                 protected ImportedParameterMemberDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1750                         : base (provider, type, importer)
1751                 {
1752                         this.parameters = parameters;
1753                 }
1754
1755                 public ImportedParameterMemberDefinition (PropertyInfo provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1756                         : base (provider, type, importer)
1757                 {
1758                         this.parameters = parameters;
1759                 }
1760
1761                 #region Properties
1762
1763                 public AParametersCollection Parameters {
1764                         get {
1765                                 return parameters;
1766                         }
1767                 }
1768
1769                 #endregion
1770         }
1771
1772         class ImportedMethodDefinition : ImportedParameterMemberDefinition, IMethodDefinition
1773         {
1774                 public ImportedMethodDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1775                         : base (provider, type, parameters, importer)
1776                 {
1777                 }
1778
1779                 MethodBase IMethodDefinition.Metadata {
1780                         get {
1781                                 return (MethodBase) provider;
1782                         }
1783                 }
1784         }
1785
1786         class ImportedGenericMethodDefinition : ImportedMethodDefinition, IGenericMethodDefinition
1787         {
1788                 readonly TypeParameterSpec[] tparams;
1789
1790                 public ImportedGenericMethodDefinition (MethodInfo provider, TypeSpec type, AParametersCollection parameters, TypeParameterSpec[] tparams, MetadataImporter importer)
1791                         : base (provider, type, parameters, importer)
1792                 {
1793                         this.tparams = tparams;
1794                 }
1795
1796                 #region Properties
1797
1798                 public TypeParameterSpec[] TypeParameters {
1799                         get {
1800                                 return tparams;
1801                         }
1802                 }
1803
1804                 public int TypeParametersCount {
1805                         get {
1806                                 return tparams.Length;
1807                         }
1808                 }
1809
1810                 #endregion
1811         }
1812
1813         class ImportedTypeDefinition : ImportedDefinition, ITypeDefinition
1814         {
1815                 TypeParameterSpec[] tparams;
1816                 string name;
1817
1818                 public ImportedTypeDefinition (MetaType type, MetadataImporter importer)
1819                         : base (type, importer)
1820                 {
1821                 }
1822
1823                 #region Properties
1824
1825                 public IAssemblyDefinition DeclaringAssembly {
1826                         get {
1827                                 return importer.GetAssemblyDefinition (provider.Module.Assembly);
1828                         }
1829                 }
1830
1831                 bool ITypeDefinition.IsComImport {
1832                         get {
1833                                 return ((MetaType) provider).IsImport;
1834                         }
1835                 }
1836
1837
1838                 bool ITypeDefinition.IsPartial {
1839                         get {
1840                                 return false;
1841                         }
1842                 }
1843
1844                 bool ITypeDefinition.IsTypeForwarder {
1845                         get {
1846 #if STATIC
1847                                 return ((MetaType) provider).__IsTypeForwarder;
1848 #else
1849                                 return false;
1850 #endif
1851                         }
1852                 }
1853
1854                 bool ITypeDefinition.IsCyclicTypeForwarder {
1855                         get {
1856 #if STATIC
1857                                 return ((MetaType) provider).__IsCyclicTypeForwarder;
1858 #else
1859                                 return false;
1860 #endif
1861                         }
1862                 }
1863
1864                 public override string Name {
1865                         get {
1866                                 if (name == null) {
1867                                         name = base.Name;
1868                                         if (tparams != null) {
1869                                                 int arity_start = name.IndexOf ('`');
1870                                                 if (arity_start > 0)
1871                                                         name = name.Substring (0, arity_start);
1872                                         }
1873                                 }
1874
1875                                 return name;
1876                         }
1877                 }
1878
1879                 public string Namespace {
1880                         get {
1881                                 return ((MetaType) provider).Namespace;
1882                         }
1883                 }
1884
1885                 public int TypeParametersCount {
1886                         get {
1887                                 return tparams == null ? 0 : tparams.Length;
1888                         }
1889                 }
1890
1891                 public TypeParameterSpec[] TypeParameters {
1892                         get {
1893                                 return tparams;
1894                         }
1895                         set {
1896                                 tparams = value;
1897                         }
1898                 }
1899
1900                 #endregion
1901
1902                 public void DefineInterfaces (TypeSpec spec)
1903                 {
1904                         var type = (MetaType) provider;
1905                         MetaType[] ifaces;
1906 #if STATIC
1907                         ifaces = type.__GetDeclaredInterfaces ();
1908                         if (ifaces.Length != 0) {
1909                                 foreach (var iface in ifaces) {
1910                                         var it = importer.CreateType (iface);
1911                                         if (it == null)
1912                                                 continue;
1913
1914                                         spec.AddInterfaceDefined (it);
1915
1916                                         // Unfortunately not all languages expand inherited interfaces
1917                                         var bifaces = it.Interfaces;
1918                                         if (bifaces != null) {
1919                                                 foreach (var biface in bifaces) {
1920                                                         spec.AddInterfaceDefined (biface);
1921                                                 }
1922                                         }
1923                                 }
1924                         }
1925
1926                         //
1927                         // It's impossible to get declared interfaces only using System.Reflection
1928                         // hence we need to mimic the behavior with ikvm-reflection too to keep
1929                         // our type look-up logic same
1930                         //
1931                         if (spec.BaseType != null) {
1932                                 var bifaces = spec.BaseType.Interfaces;
1933                                 if (bifaces != null) {
1934                                         //
1935                                         // Before adding base class interfaces close defined interfaces
1936                                         // on type parameter
1937                                         //
1938                                         var tp = spec as TypeParameterSpec;
1939                                         if (tp != null && tp.InterfacesDefined == null) {
1940                                                 tp.InterfacesDefined = TypeSpec.EmptyTypes;
1941                                         }
1942
1943                                         foreach (var iface in bifaces)
1944                                                 spec.AddInterfaceDefined (iface);
1945                                 }
1946                         }
1947 #else
1948                         ifaces = type.GetInterfaces ();
1949
1950                         if (ifaces.Length > 0) {
1951                                 foreach (var iface in ifaces) {
1952                                         spec.AddInterface (importer.CreateType (iface));
1953                                 }
1954                         }
1955 #endif
1956
1957                 }
1958
1959                 public static void Error_MissingDependency (IMemberContext ctx, List<MissingTypeSpecReference> missing, Location loc)
1960                 {
1961                         //
1962                         // Report details about missing type and most likely cause of the problem.
1963                         // csc used to reports 1683, 1684 (now 7069) as warnings but we report them only when used
1964                         // or referenced from the user core in which case compilation error has to
1965                         // be reported because compiler cannot continue anyway
1966                         //
1967
1968                         var report = ctx.Module.Compiler.Report;
1969
1970                         for (int i = 0; i < missing.Count; ++i) {
1971                                 var t = missing [i].Type;
1972
1973                                 //
1974                                 // Report missing types only once
1975                                 //
1976                                 if (report.Printer.MissingTypeReported (t.MemberDefinition))
1977                                         continue;
1978
1979                                 string name = t.GetSignatureForError ();
1980
1981                                 var caller = missing[i].Caller;
1982                                 if (caller.Kind != MemberKind.MissingType)
1983                                         report.SymbolRelatedToPreviousError (caller);
1984
1985                                 var definition = t.MemberDefinition;
1986                                 if (definition.DeclaringAssembly == ctx.Module.DeclaringAssembly) {
1987                                         report.Error (1683, loc,
1988                                                 "Reference to type `{0}' claims it is defined in this assembly, but it is not defined in source or any added modules",
1989                                                 name);
1990                                 } else if (definition.DeclaringAssembly.IsMissing) {
1991                                         if (definition.IsTypeForwarder) {
1992                                                 report.Error (1070, loc,
1993                                                         "The type `{0}' has been forwarded to an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
1994                                                         name, definition.DeclaringAssembly.FullName);
1995                                         } else {
1996                                                 report.Error (12, loc,
1997                                                         "The type `{0}' is defined in an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
1998                                                         name, definition.DeclaringAssembly.FullName);
1999                                         }
2000                                 } else if (definition.IsTypeForwarder) {
2001                                         report.Error (731, loc, "The type forwarder for type `{0}' in assembly `{1}' has circular dependency",
2002                                                 name, definition.DeclaringAssembly.FullName);
2003                                 } else {
2004                                         report.Error (7069, loc,
2005                                                 "Reference to type `{0}' claims it is defined assembly `{1}', but it could not be found",
2006                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
2007                                 }
2008                         }
2009                 }
2010
2011                 public TypeSpec GetAttributeCoClass ()
2012                 {
2013                         if (cattrs == null)
2014                                 ReadAttributes ();
2015
2016                         return cattrs.CoClass;
2017                 }
2018
2019                 public string GetAttributeDefaultMember ()
2020                 {
2021                         if (cattrs == null)
2022                                 ReadAttributes ();
2023
2024                         return cattrs.DefaultIndexerName;
2025                 }
2026
2027                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2028                 {
2029                         if (cattrs == null)
2030                                 ReadAttributes ();
2031
2032                         return cattrs.AttributeUsage;
2033                 }
2034
2035                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2036                 {
2037                         var a = importer.GetAssemblyDefinition (provider.Module.Assembly);
2038                         return a == assembly || a.IsFriendAssemblyTo (assembly);
2039                 }
2040
2041                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2042                 {
2043                         //
2044                         // Not interested in members of nested private types unless the importer needs them
2045                         //
2046                         if (declaringType.IsPrivate && importer.IgnorePrivateMembers) {
2047                                 cache = MemberCache.Empty;
2048                                 return;
2049                         }
2050
2051                         var loading_type = (MetaType) provider;
2052                         const BindingFlags all_members = BindingFlags.DeclaredOnly |
2053                                 BindingFlags.Static | BindingFlags.Instance |
2054                                 BindingFlags.Public | BindingFlags.NonPublic;
2055
2056                         const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
2057                                         MethodAttributes.Virtual | MethodAttributes.HideBySig |
2058                                         MethodAttributes.Final;
2059
2060                         Dictionary<MethodBase, MethodSpec> possible_accessors = null;
2061                         List<EventSpec> imported_events = null;
2062                         EventSpec event_spec;
2063                         MemberSpec imported;
2064                         MethodInfo m;
2065                         MemberInfo[] all;
2066                         try {
2067                                 all = loading_type.GetMembers (all_members);
2068                         } catch (Exception e) {
2069                                 throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
2070                                         declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
2071                         }
2072
2073                         if (cache == null) {
2074                                 cache = new MemberCache (all.Length);
2075
2076                                 //
2077                                 // Do the types first as they can be referenced by the members before
2078                                 // they are found or inflated
2079                                 //
2080                                 foreach (var member in all) {
2081                                         if (member.MemberType != MemberTypes.NestedType)
2082                                                 continue;
2083
2084                                         var t = (MetaType) member;
2085
2086                                         // Ignore compiler generated types, mostly lambda containers
2087                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2088                                                 continue;
2089
2090                                         try {
2091                                                 imported = importer.CreateNestedType (t, declaringType);
2092                                         } catch (Exception e) {
2093                                                 throw new InternalErrorException (e, "Could not import nested type `{0}' from `{1}'",
2094                                                         t.FullName, declaringType.MemberDefinition.DeclaringAssembly.FullName);
2095                                         }
2096
2097                                         cache.AddMemberImported (imported);
2098                                 }
2099
2100                                 foreach (var member in all) {
2101                                         if (member.MemberType != MemberTypes.NestedType)
2102                                                 continue;
2103
2104                                         var t = (MetaType) member;
2105
2106                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2107                                                 continue;
2108
2109                                         importer.ImportTypeBase (t);
2110                                 }
2111                         }
2112
2113                         //
2114                         // Load base interfaces first to minic behaviour of compiled members
2115                         //
2116                         if (declaringType.IsInterface && declaringType.Interfaces != null) {
2117                                 foreach (var iface in declaringType.Interfaces) {
2118                                         cache.AddInterface (iface);
2119                                 }
2120                         }
2121
2122                         if (!onlyTypes) {
2123                                 //
2124                                 // The logic here requires methods to be returned first which seems to work for both Mono and .NET
2125                                 //
2126                                 foreach (var member in all) {
2127                                         switch (member.MemberType) {
2128                                         case MemberTypes.Constructor:
2129                                                 if (declaringType.IsInterface)
2130                                                         continue;
2131
2132                                                 goto case MemberTypes.Method;
2133                                         case MemberTypes.Method:
2134                                                 MethodBase mb = (MethodBase) member;
2135                                                 var attrs = mb.Attributes;
2136
2137                                                 if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
2138                                                         if (importer.IgnorePrivateMembers)
2139                                                                 continue;
2140
2141                                                         // Ignore explicitly implemented members
2142                                                         if ((attrs & explicit_impl) == explicit_impl)
2143                                                                 continue;
2144
2145                                                         // Ignore compiler generated methods
2146                                                         if (MetadataImporter.HasAttribute (CustomAttributeData.GetCustomAttributes (mb), "CompilerGeneratedAttribute", MetadataImporter.CompilerServicesNamespace))
2147                                                                 continue;
2148                                                 }
2149
2150                                                 imported = importer.CreateMethod (mb, declaringType);
2151                                                 if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
2152                                                         if (possible_accessors == null)
2153                                                                 possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
2154
2155                                                         // There are no metadata rules for accessors, we have to consider any method as possible candidate
2156                                                         possible_accessors.Add (mb, (MethodSpec) imported);
2157                                                 }
2158
2159                                                 break;
2160                                         case MemberTypes.Property:
2161                                                 if (possible_accessors == null)
2162                                                         continue;
2163
2164                                                 var p = (PropertyInfo) member;
2165                                                 //
2166                                                 // Links possible accessors with property
2167                                                 //
2168                                                 MethodSpec get, set;
2169                                                 m = p.GetGetMethod (true);
2170                                                 if (m == null || !possible_accessors.TryGetValue (m, out get))
2171                                                         get = null;
2172
2173                                                 m = p.GetSetMethod (true);
2174                                                 if (m == null || !possible_accessors.TryGetValue (m, out set))
2175                                                         set = null;
2176
2177                                                 // No accessors registered (e.g. explicit implementation)
2178                                                 if (get == null && set == null)
2179                                                         continue;
2180
2181                                                 try {
2182                                                         imported = importer.CreateProperty (p, declaringType, get, set);
2183                                                 } catch (Exception ex) {
2184                                                         throw new InternalErrorException (ex, "Could not import property `{0}' inside `{1}'",
2185                                                                 p.Name, declaringType.GetSignatureForError ());
2186                                                 }
2187
2188                                                 if (imported == null)
2189                                                         continue;
2190
2191                                                 break;
2192                                         case MemberTypes.Event:
2193                                                 if (possible_accessors == null)
2194                                                         continue;
2195
2196                                                 var e = (EventInfo) member;
2197                                                 //
2198                                                 // Links accessors with event
2199                                                 //
2200                                                 MethodSpec add, remove;
2201                                                 m = e.GetAddMethod (true);
2202                                                 if (m == null || !possible_accessors.TryGetValue (m, out add))
2203                                                         add = null;
2204
2205                                                 m = e.GetRemoveMethod (true);
2206                                                 if (m == null || !possible_accessors.TryGetValue (m, out remove))
2207                                                         remove = null;
2208
2209                                                 // Both accessors are required
2210                                                 if (add == null || remove == null)
2211                                                         continue;
2212
2213                                                 event_spec = importer.CreateEvent (e, declaringType, add, remove);
2214                                                 if (!importer.IgnorePrivateMembers) {
2215                                                         if (imported_events == null)
2216                                                                 imported_events = new List<EventSpec> ();
2217
2218                                                         imported_events.Add (event_spec);
2219                                                 }
2220
2221                                                 imported = event_spec;
2222                                                 break;
2223                                         case MemberTypes.Field:
2224                                                 var fi = (FieldInfo) member;
2225
2226                                                 imported = importer.CreateField (fi, declaringType);
2227                                                 if (imported == null)
2228                                                         continue;
2229
2230                                                 //
2231                                                 // For dynamic binder event has to be fully restored to allow operations
2232                                                 // within the type container to work correctly
2233                                                 //
2234                                                 if (imported_events != null) {
2235                                                         // The backing event field should be private but it may not
2236                                                         int i;
2237                                                         for (i = 0; i < imported_events.Count; ++i) {
2238                                                                 var ev = imported_events[i];
2239                                                                 if (ev.Name == fi.Name) {
2240                                                                         ev.BackingField = (FieldSpec) imported;
2241                                                                         imported_events.RemoveAt (i);
2242                                                                         i = -1;
2243                                                                         break;
2244                                                                 }
2245                                                         }
2246
2247                                                         if (i < 0)
2248                                                                 continue;
2249                                                 }
2250
2251                                                 break;
2252                                         case MemberTypes.NestedType:
2253                                                 // Already in the cache from the first pass
2254                                                 continue;
2255                                         default:
2256                                                 throw new NotImplementedException (member.ToString ());
2257                                         }
2258
2259                                         if (imported.IsStatic && declaringType.IsInterface)
2260                                                 continue;
2261
2262                                         cache.AddMemberImported (imported);
2263                                 }
2264                         }
2265                 }
2266         }
2267
2268         class ImportedTypeParameterDefinition : ImportedDefinition, ITypeDefinition
2269         {
2270                 public ImportedTypeParameterDefinition (MetaType type, MetadataImporter importer)
2271                         : base (type, importer)
2272                 {
2273                 }
2274
2275                 #region Properties
2276
2277                 public IAssemblyDefinition DeclaringAssembly {
2278                         get {
2279                                 throw new NotImplementedException ();
2280                         }
2281                 }
2282
2283                 bool ITypeDefinition.IsComImport {
2284                         get {
2285                                 return false;
2286                         }
2287                 }
2288
2289                 bool ITypeDefinition.IsPartial {
2290                         get {
2291                                 return false;
2292                         }
2293                 }
2294
2295                 bool ITypeDefinition.IsTypeForwarder {
2296                         get {
2297                                 return false;
2298                         }
2299                 }
2300
2301                 bool ITypeDefinition.IsCyclicTypeForwarder {
2302                         get {
2303                                 return false;
2304                         }
2305                 }
2306
2307                 public string Namespace {
2308                         get {
2309                                 return null;
2310                         }
2311                 }
2312
2313                 public int TypeParametersCount {
2314                         get {
2315                                 return 0;
2316                         }
2317                 }
2318
2319                 public TypeParameterSpec[] TypeParameters {
2320                         get {
2321                                 return null;
2322                         }
2323                 }
2324
2325                 #endregion
2326
2327                 public TypeSpec GetAttributeCoClass ()
2328                 {
2329                         return null;
2330                 }
2331
2332                 public string GetAttributeDefaultMember ()
2333                 {
2334                         throw new NotSupportedException ();
2335                 }
2336
2337                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2338                 {
2339                         throw new NotSupportedException ();
2340                 }
2341
2342                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2343                 {
2344                         throw new NotImplementedException ();
2345                 }
2346
2347                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2348                 {
2349                         throw new NotImplementedException ();
2350                 }
2351         }
2352 }