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 using System.IO;
  17
  18 #if STATIC
  19 using MetaType = IKVM.Reflection.Type;
  20 using IKVM.Reflection;
  21 using IKVM.Reflection.Emit;
  22 #else
  23 using MetaType = System.Type;
  24 using System.Reflection;
  25 using System.Reflection.Emit;
  26 #endif
  27
  28 namespace Mono.CSharp
  29 {
  30         public abstract class MetadataImporter
  31         {
  32                 //
  33                 // Dynamic types reader with additional logic to reconstruct a dynamic
  34                 // type using DynamicAttribute values
  35                 //
  36                 protected struct DynamicTypeReader
  37                 {
  38                         static readonly bool[] single_attribute = { true };
  39
  40                         public int Position;
  41                         bool[] flags;
  42
  43                         // There is no common type for CustomAttributeData and we cannot
  44                         // use ICustomAttributeProvider
  45                         object provider;
  46
  47                         //
  48                         // A member provider which can be used to get CustomAttributeData
  49                         //
  50                         public DynamicTypeReader (object provider)
  51                         {
  52                                 Position = 0;
  53                                 flags = null;
  54                                 this.provider = provider;
  55                         }
  56
  57                         //
  58                         // Returns true when object at local position has dynamic attribute flag
  59                         //
  60                         public bool IsDynamicObject ()
  61                         {
  62                                 if (provider != null)
  63                                         ReadAttribute ();
  64
  65                                 return flags != null && Position < flags.Length && flags[Position];
  66                         }
  67
  68                         //
  69                         // Returns true when DynamicAttribute exists
  70                         //
  71                         public bool HasDynamicAttribute ()
  72                         {
  73                                 if (provider != null)
  74                                         ReadAttribute ();
  75
  76                                 return flags != null;
  77                         }
  78
  79                         IList<CustomAttributeData> GetCustomAttributes ()
  80                         {
  81                                 var mi = provider as MemberInfo;
  82                                 if (mi != null)
  83                                         return CustomAttributeData.GetCustomAttributes (mi);
  84
  85                                 var pi = provider as ParameterInfo;
  86                                 if (pi != null)
  87                                         return CustomAttributeData.GetCustomAttributes (pi);
  88
  89                                 provider = null;
  90                                 return null;
  91                         }
  92
  93                         void ReadAttribute ()
  94                         {
  95                                 var cad = GetCustomAttributes ();
  96                                 if (cad == null) {
  97                                         return;
  98                                 }
  99
 100                                 if (cad.Count > 0) {
 101                                         foreach (var ca in cad) {
 102                                                 var dt = ca.Constructor.DeclaringType;
 103                                                 if (dt.Name != "DynamicAttribute" || dt.Namespace != CompilerServicesNamespace)
 104                                                         continue;
 105
 106                                                 if (ca.ConstructorArguments.Count == 0) {
 107                                                         flags = single_attribute;
 108                                                         break;
 109                                                 }
 110
 111                                                 var arg_type = ca.ConstructorArguments[0].ArgumentType;
 112
 113                                                 if (arg_type.IsArray && MetaType.GetTypeCode (arg_type.GetElementType ()) == TypeCode.Boolean) {
 114                                                         var carg = (IList<CustomAttributeTypedArgument>) ca.ConstructorArguments[0].Value;
 115                                                         flags = new bool[carg.Count];
 116                                                         for (int i = 0; i < flags.Length; ++i) {
 117                                                                 if (MetaType.GetTypeCode (carg[i].ArgumentType) == TypeCode.Boolean)
 118                                                                         flags[i] = (bool) carg[i].Value;
 119                                                         }
 120
 121                                                         break;
 122                                                 }
 123                                         }
 124                                 }
 125
 126                                 provider = null;
 127                         }
 128                 }
 129
 130                 protected readonly Dictionary<MetaType, TypeSpec> import_cache;
 131                 protected readonly Dictionary<MetaType, TypeSpec> compiled_types;
 132                 protected readonly Dictionary<Assembly, IAssemblyDefinition> assembly_2_definition;
 133                 protected readonly ModuleContainer module;
 134
 135                 public static readonly string CompilerServicesNamespace = "System.Runtime.CompilerServices";
 136
 137                 protected MetadataImporter (ModuleContainer module)
 138                 {
 139                         this.module = module;
 140
 141                         import_cache = new Dictionary<MetaType, TypeSpec> (1024, ReferenceEquality<MetaType>.Default);
 142                         compiled_types = new Dictionary<MetaType, TypeSpec> (40, ReferenceEquality<MetaType>.Default);
 143                         assembly_2_definition = new Dictionary<Assembly, IAssemblyDefinition> (ReferenceEquality<Assembly>.Default);
 144                         IgnorePrivateMembers = true;
 145                         IgnoreCompilerGeneratedField = true;
 146                 }
 147
 148                 #region Properties
 149
 150                 public ICollection<IAssemblyDefinition> Assemblies {
 151                         get {
 152                                 return assembly_2_definition.Values;
 153                         }
 154                 }
 155
 156                 public bool IgnorePrivateMembers { get; set; }
 157
 158                 public bool IgnoreCompilerGeneratedField { get; set; }
 159
 160                 #endregion
 161
 162                 public abstract void AddCompiledType (TypeBuilder builder, TypeSpec spec);
 163                 protected abstract MemberKind DetermineKindFromBaseType (MetaType baseType);
 164                 protected abstract bool HasVolatileModifier (MetaType[] modifiers);
 165
 166                 public FieldSpec CreateField (FieldInfo fi, TypeSpec declaringType)
 167                 {
 168                         Modifiers mod;
 169                         var fa = fi.Attributes;
 170                         switch (fa & FieldAttributes.FieldAccessMask) {
 171                                 case FieldAttributes.Public:
 172                                         mod = Modifiers.PUBLIC;
 173                                         break;
 174                                 case FieldAttributes.Assembly:
 175                                         mod = Modifiers.INTERNAL;
 176                                         break;
 177                                 case FieldAttributes.Family:
 178                                         mod = Modifiers.PROTECTED;
 179                                         break;
 180                                 case FieldAttributes.FamORAssem:
 181                                         mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 182                                         break;
 183                                 default:
 184                                         // Ignore private fields (even for error reporting) to not require extra dependencies
 185                                         if (IgnorePrivateMembers && !declaringType.IsStruct)
 186                                                 return null;
 187
 188                                         if (IgnoreCompilerGeneratedField && HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "CompilerGeneratedAttribute", CompilerServicesNamespace))
 189                                                 return null;
 190
 191                                         mod = Modifiers.PRIVATE;
 192                                         break;
 193                         }
 194
 195                         TypeSpec field_type;
 196
 197                         try {
 198                                 field_type = ImportType (fi.FieldType, new DynamicTypeReader (fi));
 199
 200                                 //
 201                                 // Private field has private type which is not fixed buffer
 202                                 //
 203                                 if (field_type == null)
 204                                         return null;
 205                         } catch (Exception e) {
 206                                 // TODO: I should construct fake TypeSpec based on TypeRef signature
 207                                 // but there is no way to do it with System.Reflection
 208                                 throw new InternalErrorException (e, "Cannot import field `{0}.{1}' referenced in assembly `{2}'",
 209                                         declaringType.GetSignatureForError (), fi.Name, declaringType.MemberDefinition.DeclaringAssembly);
 210                         }
 211
 212                         var definition = new ImportedMemberDefinition (fi, field_type, this);
 213
 214                         if ((fa & FieldAttributes.Literal) != 0) {
 215                                 Constant c = field_type.Kind == MemberKind.MissingType ?
 216                                         new NullConstant (InternalType.ErrorType, Location.Null) :
 217                                         CreateConstantFromValue (field_type, fi);
 218                                 return new ConstSpec (declaringType, definition, field_type, fi, mod | Modifiers.STATIC, c);
 219                         }
 220
 221                         if ((fa & FieldAttributes.InitOnly) != 0) {
 222                                 if (field_type.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 223                                         var dc = ReadDecimalConstant (CustomAttributeData.GetCustomAttributes (fi));
 224                                         if (dc != null)
 225                                                 return new ConstSpec (declaringType, definition, field_type, fi, mod | Modifiers.STATIC, dc);
 226                                 }
 227
 228                                 mod |= Modifiers.READONLY;
 229                         } else {
 230                                 var req_mod = fi.GetRequiredCustomModifiers ();
 231                                 if (req_mod.Length > 0 && HasVolatileModifier (req_mod))
 232                                         mod |= Modifiers.VOLATILE;
 233                         }
 234
 235                         if ((fa & FieldAttributes.Static) != 0) {
 236                                 mod |= Modifiers.STATIC;
 237                         } else {
 238                                 // Fixed buffers cannot be static
 239                                 if (declaringType.IsStruct && field_type.IsStruct && field_type.IsNested &&
 240                                         HasAttribute (CustomAttributeData.GetCustomAttributes (fi), "FixedBufferAttribute", CompilerServicesNamespace)) {
 241
 242                                         // TODO: Sanity check on field_type (only few types are allowed)
 243                                         var element_field = CreateField (fi.FieldType.GetField (FixedField.FixedElementName), declaringType);
 244                                         return new FixedFieldSpec (module, declaringType, definition, fi, element_field, mod);
 245                                 }
 246                         }
 247
 248                         return new FieldSpec (declaringType, definition, field_type, fi, mod);
 249                 }
 250
 251                 Constant CreateConstantFromValue (TypeSpec fieldType, FieldInfo fi)
 252                 {
 253                         var value = fi.GetRawConstantValue ();
 254                         //
 255                         // Metadata value can be encoded using different constant value type
 256                         // than is actual field type
 257                         //
 258                         // e.g. unsigned int16 CONSTANT = int16 (0x0000ffff)
 259                         //
 260                         if (value != null && !fieldType.IsEnum) {
 261                                 var c = ImportConstant (value);
 262                                 if (c != null) {
 263                                         return fieldType == c.Type ? c : c.ConvertExplicitly (false, fieldType);
 264                                 }
 265                         }
 266
 267                         return Constant.CreateConstantFromValue (fieldType, value, Location.Null);
 268                 }
 269
 270                 public EventSpec CreateEvent (EventInfo ei, TypeSpec declaringType, MethodSpec add, MethodSpec remove)
 271                 {
 272                         add.IsAccessor = true;
 273                         remove.IsAccessor = true;
 274
 275                         if (add.Modifiers != remove.Modifiers)
 276                                 throw new NotImplementedException ("Different accessor modifiers " + ei.Name);
 277
 278                         var event_type = ImportType (ei.EventHandlerType, new DynamicTypeReader (ei));
 279                         var definition = new ImportedMemberDefinition (ei, event_type,  this);
 280                         return new EventSpec (declaringType, definition, event_type, add.Modifiers, add, remove);
 281                 }
 282
 283                 TypeParameterSpec[] CreateGenericParameters (MetaType type, TypeSpec declaringType)
 284                 {
 285                         var tparams = type.GetGenericArguments ();
 286
 287                         int parent_owned_count;
 288                         if (type.IsNested) {
 289                                 parent_owned_count = type.DeclaringType.GetGenericArguments ().Length;
 290
 291                                 //
 292                                 // System.Reflection duplicates parent type parameters for each
 293                                 // nested type with slightly modified properties (eg. different owner)
 294                                 // This just makes things more complicated (think of cloned constraints)
 295                                 // therefore we remap any nested type owned by parent using `type_cache'
 296                                 // to the single TypeParameterSpec
 297                                 //
 298                                 if (declaringType != null && parent_owned_count > 0) {
 299                                         int read_count = 0;
 300                                         while (read_count != parent_owned_count) {
 301                                                 var tparams_count = declaringType.Arity;
 302                                                 if (tparams_count != 0) {
 303                                                         var parent_tp = declaringType.MemberDefinition.TypeParameters;
 304                                                         read_count += tparams_count;
 305                                                         for (int i = 0; i < tparams_count; i++) {
 306                                                                 import_cache.Add (tparams[parent_owned_count - read_count + i], parent_tp[i]);
 307                                                         }
 308                                                 }
 309
 310                                                 declaringType = declaringType.DeclaringType;
 311                                         }
 312                                 }
 313                         } else {
 314                                 parent_owned_count = 0;
 315                         }
 316
 317                         if (tparams.Length - parent_owned_count == 0)
 318                                 return null;
 319
 320                         return CreateGenericParameters (parent_owned_count, tparams);
 321                 }
 322
 323                 TypeParameterSpec[] CreateGenericParameters (int first, MetaType[] tparams)
 324                 {
 325                         var tspec = new TypeParameterSpec[tparams.Length - first];
 326                         for (int pos = first; pos < tparams.Length; ++pos) {
 327                                 var type = tparams[pos];
 328                                 int index = pos - first;
 329
 330                                 tspec[index] = (TypeParameterSpec) CreateType (type, new DynamicTypeReader (), false);
 331                         }
 332
 333                         return tspec;
 334                 }
 335
 336                 TypeSpec[] CreateGenericArguments (int first, MetaType[] tparams, DynamicTypeReader dtype)
 337                 {
 338                         ++dtype.Position;
 339
 340                         var tspec = new TypeSpec [tparams.Length - first];
 341                         for (int pos = first; pos < tparams.Length; ++pos) {
 342                                 var type = tparams[pos];
 343                                 int index = pos - first;
 344
 345                                 TypeSpec spec;
 346                                 if (type.HasElementType) {
 347                                         var element = type.GetElementType ();
 348                                         ++dtype.Position;
 349                                         spec = ImportType (element, dtype);
 350
 351                                         if (!type.IsArray) {
 352                                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
 353                                         }
 354
 355                                         spec = ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
 356                                 } else {
 357                                         spec = CreateType (type, dtype, true);
 358
 359                                         //
 360                                         // We treat nested generic types as inflated internally where
 361                                         // reflection uses type definition
 362                                         //
 363                                         // class A<T> {
 364                                         //    IFoo<A<T>> foo;   // A<T> is definition in this case
 365                                         // }
 366                                         //
 367                                         if (!IsMissingType (type) && type.IsGenericTypeDefinition) {
 368                                                 var start_pos = spec.DeclaringType == null ? 0 : spec.DeclaringType.MemberDefinition.TypeParametersCount;
 369                                                 var targs = CreateGenericArguments (start_pos, type.GetGenericArguments (), dtype);
 370                                                 spec = spec.MakeGenericType (module, targs);
 371                                         }
 372                                 }
 373
 374                                 if (spec == null)
 375                                         return null;
 376
 377                                 ++dtype.Position;
 378                                 tspec[index] = spec;
 379                         }
 380
 381                         return tspec;
 382                 }
 383
 384                 public MethodSpec CreateMethod (MethodBase mb, TypeSpec declaringType)
 385                 {
 386                         Modifiers mod = ReadMethodModifiers (mb, declaringType);
 387                         TypeParameterSpec[] tparams;
 388
 389                         var parameters = CreateParameters (declaringType, mb.GetParameters (), mb);
 390
 391                         if (mb.IsGenericMethod) {
 392                                 if (!mb.IsGenericMethodDefinition)
 393                                         throw new NotSupportedException ("assert");
 394
 395                                 tparams = CreateGenericParameters (0, mb.GetGenericArguments ());
 396                         } else {
 397                                 tparams = null;
 398                         }
 399
 400                         MemberKind kind;
 401                         TypeSpec returnType;
 402                         if (mb.MemberType == MemberTypes.Constructor) {
 403                                 kind = MemberKind.Constructor;
 404                                 returnType = module.Compiler.BuiltinTypes.Void;
 405                         } else {
 406                                 //
 407                                 // Detect operators and destructors
 408                                 //
 409                                 string name = mb.Name;
 410                                 kind = MemberKind.Method;
 411                                 if (tparams == null && !mb.DeclaringType.IsInterface && name.Length > 6) {
 412                                         if ((mod & (Modifiers.STATIC | Modifiers.PUBLIC)) == (Modifiers.STATIC | Modifiers.PUBLIC)) {
 413                                                 if (name[2] == '_' && name[1] == 'p' && name[0] == 'o' && (mb.Attributes & MethodAttributes.SpecialName) != 0) {
 414                                                         var op_type = Operator.GetType (name);
 415                                                         if (op_type.HasValue && parameters.Count > 0 && parameters.Count < 3) {
 416                                                                 kind = MemberKind.Operator;
 417                                                         }
 418                                                 }
 419                                         } else if (parameters.IsEmpty && name == Destructor.MetadataName) {
 420                                                 kind = MemberKind.Destructor;
 421                                                 if (declaringType.BuiltinType == BuiltinTypeSpec.Type.Object) {
 422                                                         mod &= ~Modifiers.OVERRIDE;
 423                                                         mod |= Modifiers.VIRTUAL;
 424                                                 }
 425                                         }
 426                                 }
 427
 428                                 var mi = (MethodInfo) mb;
 429                                 returnType = ImportType (mi.ReturnType, new DynamicTypeReader (mi.ReturnParameter));
 430
 431                                 // Cannot set to OVERRIDE without full hierarchy checks
 432                                 // this flag indicates that the method could be override
 433                                 // but further validation is needed
 434                                 if ((mod & Modifiers.OVERRIDE) != 0) {
 435                                         bool is_real_override = false;
 436                                         if (kind == MemberKind.Method && declaringType.BaseType != null) {
 437                                                 var btype = declaringType.BaseType;
 438                                                 if (IsOverrideMethodBaseTypeAccessible (btype)) {
 439                                                         var filter = MemberFilter.Method (name, tparams != null ? tparams.Length : 0, parameters, null);
 440                                                         var candidate = MemberCache.FindMember (btype, filter, BindingRestriction.None);
 441
 442                                                         //
 443                                                         // For imported class method do additional validation to be sure that metadata
 444                                                         // override flag was correct
 445                                                         //
 446                                                         // Difference between protected internal and protected is ok
 447                                                         //
 448                                                         const Modifiers conflict_mask = Modifiers.AccessibilityMask & ~Modifiers.INTERNAL;
 449                                                         if (candidate != null && (candidate.Modifiers & conflict_mask) == (mod & conflict_mask) && !candidate.IsStatic) {
 450                                                                 is_real_override = true;
 451                                                         }
 452                                                 }
 453                                         }
 454
 455                                         if (!is_real_override) {
 456                                                 mod &= ~Modifiers.OVERRIDE;
 457                                                 if ((mod & Modifiers.SEALED) != 0)
 458                                                         mod &= ~Modifiers.SEALED;
 459                                                 else
 460                                                         mod |= Modifiers.VIRTUAL;
 461                                         }
 462                                 } else if (parameters.HasExtensionMethodType) {
 463                                         mod |= Modifiers.METHOD_EXTENSION;
 464                                 }
 465                         }
 466
 467                         IMethodDefinition definition;
 468                         if (tparams != null) {
 469                                 var gmd = new ImportedGenericMethodDefinition ((MethodInfo) mb, returnType, parameters, tparams, this);
 470                                 foreach (var tp in gmd.TypeParameters) {
 471                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
 472                                 }
 473
 474                                 definition = gmd;
 475                         } else {
 476                                 definition = new ImportedMethodDefinition (mb, returnType, parameters, this);
 477                         }
 478
 479                         MethodSpec ms = new MethodSpec (kind, declaringType, definition, returnType, parameters, mod);
 480                         if (tparams != null)
 481                                 ms.IsGeneric = true;
 482
 483                         return ms;
 484                 }
 485
 486                 bool IsOverrideMethodBaseTypeAccessible (TypeSpec baseType)
 487                 {
 488                         switch (baseType.Modifiers & Modifiers.AccessibilityMask) {
 489                         case Modifiers.PUBLIC:
 490                                 return true;
 491                         case Modifiers.INTERNAL:
 492                                 //
 493                                 // Check whether imported method in base type is accessible from compiled
 494                                 // context
 495                                 //
 496                                 return baseType.MemberDefinition.IsInternalAsPublic (module.DeclaringAssembly);
 497                         case Modifiers.PRIVATE:
 498                                 return false;
 499                         default:
 500                                 // protected
 501                                 // protected internal
 502                                 //
 503                                 // Method accessibility checks will be done later based on context
 504                                 // where the method is called (CS0122 error will be reported for inaccessible)
 505                                 //
 506                                 return true;
 507                         }
 508                 }
 509
 510                 //
 511                 // Imports System.Reflection parameters
 512                 //
 513                 AParametersCollection CreateParameters (TypeSpec parent, ParameterInfo[] pi, MethodBase method)
 514                 {
 515                         int varargs = method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0 ? 1 : 0;
 516
 517                         if (pi.Length == 0 && varargs == 0)
 518                                 return ParametersCompiled.EmptyReadOnlyParameters;
 519
 520                         TypeSpec[] types = new TypeSpec[pi.Length + varargs];
 521                         IParameterData[] par = new IParameterData[pi.Length + varargs];
 522                         bool is_params = false;
 523                         for (int i = 0; i < pi.Length; i++) {
 524                                 ParameterInfo p = pi[i];
 525                                 Parameter.Modifier mod = 0;
 526                                 Expression default_value = null;
 527                                 if (p.ParameterType.IsByRef) {
 528                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 529                                                 mod = Parameter.Modifier.OUT;
 530                                         else
 531                                                 mod = Parameter.Modifier.REF;
 532
 533                                         //
 534                                         // Strip reference wrapping
 535                                         //
 536                                         var el = p.ParameterType.GetElementType ();
 537                                         types[i] = ImportType (el, new DynamicTypeReader (p));  // TODO: 1-based positio to be csc compatible
 538                                 } else if (i == 0 && method.IsStatic && (parent.Modifiers & Modifiers.METHOD_EXTENSION) != 0 &&
 539                                         HasAttribute (CustomAttributeData.GetCustomAttributes (method), "ExtensionAttribute", CompilerServicesNamespace)) {
 540                                         mod = Parameter.Modifier.This;
 541                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 542                                 } else {
 543                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 544
 545                                         if (i >= pi.Length - 2 && types[i] is ArrayContainer) {
 546                                                 if (HasAttribute (CustomAttributeData.GetCustomAttributes (p), "ParamArrayAttribute", "System")) {
 547                                                         mod = Parameter.Modifier.PARAMS;
 548                                                         is_params = true;
 549                                                 }
 550                                         }
 551
 552                                         if (!is_params && p.IsOptional) {
 553                                                 object value = p.RawDefaultValue;
 554                                                 var ptype = types[i];
 555                                                 if ((p.Attributes & ParameterAttributes.HasDefault) != 0 && ptype.Kind != MemberKind.TypeParameter && (value != null || TypeSpec.IsReferenceType (ptype))) {
 556                                                         if (value == null) {
 557                                                                 default_value = Constant.CreateConstantFromValue (ptype, null, Location.Null);
 558                                                         } else {
 559                                                                 default_value = ImportConstant (value);
 560
 561                                                                 if (ptype.IsEnum) {
 562                                                                         default_value = new EnumConstant ((Constant) default_value, ptype);
 563                                                                 }
 564                                                         }
 565
 566                                                         var attrs = CustomAttributeData.GetCustomAttributes (p);
 567                                                         for (int ii = 0; ii < attrs.Count; ++ii) {
 568                                                                 var attr = attrs[ii];
 569                                                                 var dt = attr.Constructor.DeclaringType;
 570                                                                 if (dt.Namespace != CompilerServicesNamespace)
 571                                                                         continue;
 572
 573                                                                 if (dt.Name == "CallerLineNumberAttribute" && (ptype.BuiltinType == BuiltinTypeSpec.Type.Int || Convert.ImplicitNumericConversionExists (module.Compiler.BuiltinTypes.Int, ptype)))
 574                                                                         mod |= Parameter.Modifier.CallerLineNumber;
 575                                                                 else if (dt.Name == "CallerFilePathAttribute" && Convert.ImplicitReferenceConversionExists (module.Compiler.BuiltinTypes.String, ptype))
 576                                                                         mod |= Parameter.Modifier.CallerFilePath;
 577                                                                 else if (dt.Name == "CallerMemberNameAttribute" && Convert.ImplicitReferenceConversionExists (module.Compiler.BuiltinTypes.String, ptype))
 578                                                                         mod |= Parameter.Modifier.CallerMemberName;
 579                                                         }
 580                                                 } else if (value == Missing.Value) {
 581                                                         default_value = EmptyExpression.MissingValue;
 582                                                 } else if (value == null) {
 583                                                         default_value = new DefaultValueExpression (new TypeExpression (ptype, Location.Null), Location.Null);
 584                                                 } else if (ptype.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 585                                                         default_value = ImportConstant (value);
 586                                                 }
 587                                         }
 588                                 }
 589
 590                                 par[i] = new ParameterData (p.Name, mod, default_value);
 591                         }
 592
 593                         if (varargs != 0) {
 594                                 par[par.Length - 1] = new ArglistParameter (Location.Null);
 595                                 types[types.Length - 1] = InternalType.Arglist;
 596                         }
 597
 598                         return method != null ?
 599                                 new ParametersImported (par, types, varargs != 0, is_params) :
 600                                 new ParametersImported (par, types, is_params);
 601                 }
 602
 603                 //
 604                 // Returns null when the property is not valid C# property
 605                 //
 606                 public PropertySpec CreateProperty (PropertyInfo pi, TypeSpec declaringType, MethodSpec get, MethodSpec set)
 607                 {
 608                         Modifiers mod = 0;
 609                         AParametersCollection param = null;
 610                         TypeSpec type = null;
 611                         if (get != null) {
 612                                 mod = get.Modifiers;
 613                                 param = get.Parameters;
 614                                 type = get.ReturnType;
 615                         }
 616
 617                         bool is_valid_property = true;
 618                         if (set != null) {
 619                                 if (set.ReturnType.Kind != MemberKind.Void)
 620                                         is_valid_property = false;
 621
 622                                 var set_param_count = set.Parameters.Count - 1;
 623
 624                                 if (set_param_count < 0) {
 625                                         set_param_count = 0;
 626                                         is_valid_property = false;
 627                                 }
 628
 629                                 var set_type = set.Parameters.Types[set_param_count];
 630
 631                                 if (mod == 0) {
 632                                         AParametersCollection set_based_param;
 633
 634                                         if (set_param_count == 0) {
 635                                                 set_based_param = ParametersCompiled.EmptyReadOnlyParameters;
 636                                         } else {
 637                                                 //
 638                                                 // Create indexer parameters based on setter method parameters (the last parameter has to be removed)
 639                                                 //
 640                                                 var data = new IParameterData[set_param_count];
 641                                                 var types = new TypeSpec[set_param_count];
 642                                                 Array.Copy (set.Parameters.FixedParameters, data, set_param_count);
 643                                                 Array.Copy (set.Parameters.Types, types, set_param_count);
 644                                                 set_based_param = new ParametersImported (data, types, set.Parameters.HasParams);
 645                                         }
 646
 647                                         mod = set.Modifiers;
 648                                         param = set_based_param;
 649                                         type = set_type;
 650                                 } else {
 651                                         if (set_param_count != get.Parameters.Count)
 652                                                 is_valid_property = false;
 653
 654                                         if (get.ReturnType != set_type)
 655                                                 is_valid_property = false;
 656
 657                                         // Possible custom accessor modifiers
 658                                         if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
 659                                                 var get_acc = mod & Modifiers.AccessibilityMask;
 660                                                 if (get_acc != Modifiers.PUBLIC) {
 661                                                         var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
 662                                                         // If the accessor modifiers are not same, do extra restriction checks
 663                                                         if (get_acc != set_acc) {
 664                                                                 var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
 665                                                                 var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
 666                                                                 if (get_restr && set_restr) {
 667                                                                         is_valid_property = false; // Neither is more restrictive
 668                                                                 }
 669
 670                                                                 if (get_restr) {
 671                                                                         mod &= ~Modifiers.AccessibilityMask;
 672                                                                         mod |= set_acc;
 673                                                                 }
 674                                                         }
 675                                                 }
 676                                         }
 677                                 }
 678                         }
 679
 680                         PropertySpec spec = null;
 681                         if (!param.IsEmpty) {
 682                                 if (is_valid_property) {
 683                                         var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
 684                                         if (index_name == null || index_name != pi.Name) {
 685                                                 is_valid_property = false;
 686                                         } else {
 687                                                 if (get != null) {
 688                                                         if (get.IsStatic)
 689                                                                 is_valid_property = false;
 690                                                 }
 691                                                 if (set != null) {
 692                                                         if (set.IsStatic)
 693                                                                 is_valid_property = false;
 694                                                 }
 695                                         }
 696
 697                                         if (is_valid_property) {
 698                                                 spec = new IndexerSpec (declaringType, new ImportedParameterMemberDefinition (pi, type, param, this), type, param, pi, mod);
 699                                         } else if (declaringType.MemberDefinition.IsComImport && param.FixedParameters[0].HasDefaultValue) {
 700                                                 //
 701                                                 // Enables support for properties with parameters (must have default value) of COM-imported types
 702                                                 //
 703                                                 is_valid_property = true;
 704
 705                                                 for (int i = 0; i < param.FixedParameters.Length; ++i) {
 706                                                         if (!param.FixedParameters[i].HasDefaultValue) {
 707                                                                 is_valid_property = false;
 708                                                                 break;
 709                                                         }
 710                                                 }
 711                                         }
 712                                 }
 713                         }
 714
 715                         if (spec == null)
 716                                 spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi, type, this), type, pi, mod);
 717
 718                         if (!is_valid_property) {
 719                                 spec.IsNotCSharpCompatible = true;
 720                                 return spec;
 721                         }
 722
 723                         if (set != null)
 724                                 spec.Set = set;
 725                         if (get != null)
 726                                 spec.Get = get;
 727
 728                         return spec;
 729                 }
 730
 731                 public TypeSpec CreateType (MetaType type)
 732                 {
 733                         return CreateType (type, new DynamicTypeReader (), true);
 734                 }
 735
 736                 public TypeSpec CreateNestedType (MetaType type, TypeSpec declaringType)
 737                 {
 738                         return CreateType (type, declaringType, new DynamicTypeReader (type), false);
 739                 }
 740
 741                 TypeSpec CreateType (MetaType type, DynamicTypeReader dtype, bool canImportBaseType)
 742                 {
 743                         TypeSpec declaring_type;
 744                         if (type.IsNested && !type.IsGenericParameter)
 745                                 declaring_type = CreateType (type.DeclaringType, new DynamicTypeReader (type.DeclaringType), true);
 746                         else
 747                                 declaring_type = null;
 748
 749                         return CreateType (type, declaring_type, dtype, canImportBaseType);
 750                 }
 751
 752                 protected TypeSpec CreateType (MetaType type, TypeSpec declaringType, DynamicTypeReader dtype, bool canImportBaseType)
 753                 {
 754                         TypeSpec spec;
 755                         if (import_cache.TryGetValue (type, out spec)) {
 756                                 if (spec.BuiltinType == BuiltinTypeSpec.Type.Object) {
 757                                         if (dtype.IsDynamicObject ())
 758                                                 return module.Compiler.BuiltinTypes.Dynamic;
 759
 760                                         return spec;
 761                                 }
 762
 763                                 if (!spec.IsGeneric || type.IsGenericTypeDefinition)
 764                                         return spec;
 765
 766                                 if (!dtype.HasDynamicAttribute ())
 767                                         return spec;
 768
 769                                 // We've found same object in the cache but this one has a dynamic custom attribute
 770                                 // and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
 771                                 // Do type resolve process again in that case
 772
 773                                 // TODO: Handle cases where they still unify
 774                         }
 775
 776                         if (IsMissingType (type)) {
 777                                 spec = new TypeSpec (MemberKind.MissingType, declaringType, new ImportedTypeDefinition (type, this), type, Modifiers.PUBLIC);
 778                                 spec.MemberCache = MemberCache.Empty;
 779                                 import_cache.Add (type, spec);
 780                                 return spec;
 781                         }
 782
 783                         if (type.IsGenericType && !type.IsGenericTypeDefinition) {
 784                                 var type_def = type.GetGenericTypeDefinition ();
 785
 786                                 // Generic type definition can also be forwarded
 787                                 if (compiled_types.TryGetValue (type_def, out spec))
 788                                         return spec;
 789
 790                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 791                                 if (targs == null)
 792                                         return null;
 793                                 if (declaringType == null) {
 794                                         // Simple case, no nesting
 795                                         spec = CreateType (type_def, null, new DynamicTypeReader (), canImportBaseType);
 796                                         spec = spec.MakeGenericType (module, targs);
 797                                 } else {
 798                                         //
 799                                         // Nested type case, converting .NET types like
 800                                         // A`1.B`1.C`1<int, long, string> to typespec like
 801                                         // A<int>.B<long>.C<string>
 802                                         //
 803                                         var nested_hierarchy = new List<TypeSpec> ();
 804                                         while (declaringType.IsNested) {
 805                                                 nested_hierarchy.Add (declaringType);
 806                                                 declaringType = declaringType.DeclaringType;
 807                                         }
 808
 809                                         int targs_pos = 0;
 810                                         if (declaringType.Arity > 0) {
 811                                                 spec = declaringType.MakeGenericType (module, targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
 812                                                 targs_pos = spec.Arity;
 813                                         } else {
 814                                                 spec = declaringType;
 815                                         }
 816
 817                                         for (int i = nested_hierarchy.Count; i != 0; --i) {
 818                                                 var t = nested_hierarchy [i - 1];
 819                                                 if (t.Kind == MemberKind.MissingType)
 820                                                         spec = t;
 821                                                 else
 822                                                         spec = MemberCache.FindNestedType (spec, t.Name, t.Arity, false);
 823
 824                                                 if (t.Arity > 0) {
 825                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
 826                                                         targs_pos += t.Arity;
 827                                                 }
 828                                         }
 829
 830                                         if (spec.Kind == MemberKind.MissingType) {
 831                                                 spec = new TypeSpec (MemberKind.MissingType, spec, new ImportedTypeDefinition (type_def, this), type_def, Modifiers.PUBLIC);
 832                                                 spec.MemberCache = MemberCache.Empty;
 833                                         } else {
 834                                                 if ((type_def.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && IgnorePrivateMembers)
 835                                                         return null;
 836
 837                                                 string name = type.Name;
 838                                                 int index = name.IndexOf ('`');
 839                                                 if (index > 0)
 840                                                         name = name.Substring (0, index);
 841
 842                                                 spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos, false);
 843
 844                                                 if (spec.Arity > 0) {
 845                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).ToArray ());
 846                                                 }
 847                                         }
 848                                 }
 849
 850                                 // Don't add generic type with dynamic arguments, they can interfere with same type
 851                                 // using object type arguments
 852                                 if (!spec.HasDynamicElement) {
 853
 854                                         // Add to reading cache to speed up reading
 855                                         if (!import_cache.ContainsKey (type))
 856                                                 import_cache.Add (type, spec);
 857                                 }
 858
 859                                 return spec;
 860                         }
 861
 862                         Modifiers mod;
 863                         MemberKind kind;
 864
 865                         var ma = type.Attributes;
 866                         switch (ma & TypeAttributes.VisibilityMask) {
 867                         case TypeAttributes.Public:
 868                         case TypeAttributes.NestedPublic:
 869                                 mod = Modifiers.PUBLIC;
 870                                 break;
 871                         case TypeAttributes.NestedPrivate:
 872                                 mod = Modifiers.PRIVATE;
 873                                 break;
 874                         case TypeAttributes.NestedFamily:
 875                                 mod = Modifiers.PROTECTED;
 876                                 break;
 877                         case TypeAttributes.NestedFamORAssem:
 878                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 879                                 break;
 880                         default:
 881                                 mod = Modifiers.INTERNAL;
 882                                 break;
 883                         }
 884
 885                         if ((ma & TypeAttributes.Interface) != 0) {
 886                                 kind = MemberKind.Interface;
 887                         } else if (type.IsGenericParameter) {
 888                                 kind = MemberKind.TypeParameter;
 889                         } else {
 890                                 var base_type = type.BaseType;
 891                                 if (base_type == null || (ma & TypeAttributes.Abstract) != 0) {
 892                                         kind = MemberKind.Class;
 893                                 } else {
 894                                         kind = DetermineKindFromBaseType (base_type);
 895                                         if (kind == MemberKind.Struct || kind == MemberKind.Delegate) {
 896                                                 mod |= Modifiers.SEALED;
 897                                         }
 898                                 }
 899
 900                                 if (kind == MemberKind.Class) {
 901                                         if ((ma & TypeAttributes.Sealed) != 0) {
 902                                                 if ((ma & TypeAttributes.Abstract) != 0)
 903                                                         mod |= Modifiers.STATIC;
 904                                                 else
 905                                                         mod |= Modifiers.SEALED;
 906                                         } else if ((ma & TypeAttributes.Abstract) != 0) {
 907                                                 mod |= Modifiers.ABSTRACT;
 908                                         }
 909                                 }
 910                         }
 911
 912                         var definition = new ImportedTypeDefinition (type, this);
 913                         TypeSpec pt;
 914
 915                         if (kind == MemberKind.Enum) {
 916                                 const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
 917                                         BindingFlags.Instance |
 918                                         BindingFlags.Public | BindingFlags.NonPublic;
 919
 920                                 var type_members = type.GetFields (underlying_member);
 921                                 foreach (var type_member in type_members) {
 922                                         spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
 923                                         break;
 924                                 }
 925
 926                                 if (spec == null)
 927                                         kind = MemberKind.Class;
 928
 929                         } else if (kind == MemberKind.TypeParameter) {
 930                                 spec = CreateTypeParameter (type, declaringType);
 931                         } else if (type.IsGenericTypeDefinition) {
 932                                 definition.TypeParameters = CreateGenericParameters (type, declaringType);
 933                         } else if (compiled_types.TryGetValue (type, out pt)) {
 934                                 //
 935                                 // Same type was found in inside compiled types. It's
 936                                 // either build-in type or forward referenced typed
 937                                 // which point into just compiled assembly.
 938                                 //
 939                                 spec = pt;
 940                                 BuiltinTypeSpec bts = pt as BuiltinTypeSpec;
 941                                 if (bts != null)
 942                                         bts.SetDefinition (definition, type, mod);
 943                         }
 944
 945                         if (spec == null)
 946                                 spec = new TypeSpec (kind, declaringType, definition, type, mod);
 947
 948                         import_cache.Add (type, spec);
 949
 950                         if (kind == MemberKind.TypeParameter) {
 951                                 if (canImportBaseType)
 952                                         ImportTypeParameterTypeConstraints ((TypeParameterSpec) spec, type);
 953
 954                                 return spec;
 955                         }
 956
 957                         //
 958                         // Two stage setup as the base type can be inflated declaring type or
 959                         // another nested type inside same declaring type which has not been
 960                         // loaded, therefore we can import a base type of nested types once
 961                         // the types have been imported
 962                         //
 963                         if (canImportBaseType)
 964                                 ImportTypeBase (spec, type);
 965
 966                         return spec;
 967                 }
 968
 969                 public IAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
 970                 {
 971                         IAssemblyDefinition found;
 972                         if (!assembly_2_definition.TryGetValue (assembly, out found)) {
 973
 974                                 // This can happen in dynamic context only
 975                                 var def = new ImportedAssemblyDefinition (assembly);
 976                                 assembly_2_definition.Add (assembly, def);
 977                                 def.ReadAttributes ();
 978                                 found = def;
 979                         }
 980
 981                         return found;
 982                 }
 983
 984                 public ImportedAssemblyDefinition GetImportedAssemblyDefinition (AssemblyName assemblyName)
 985                 {
 986                         foreach (var a in Assemblies) {
 987                                 var ia = a as ImportedAssemblyDefinition;
 988                                 if (ia == null)
 989                                         continue;
 990
 991                                 if (a.Name == assemblyName.Name)
 992                                         return ia;
 993                         }
 994
 995                         return null;
 996                 }
 997
 998
 999                 public void ImportTypeBase (MetaType type)
1000                 {
1001                         TypeSpec spec = import_cache[type];
1002                         if (spec != null)
1003                                 ImportTypeBase (spec, type);
1004                 }
1005
1006                 TypeParameterSpec CreateTypeParameter (MetaType type, TypeSpec declaringType)
1007                 {
1008                         Variance variance;
1009                         switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
1010                         case GenericParameterAttributes.Covariant:
1011                                 variance = Variance.Covariant;
1012                                 break;
1013                         case GenericParameterAttributes.Contravariant:
1014                                 variance = Variance.Contravariant;
1015                                 break;
1016                         default:
1017                                 variance = Variance.None;
1018                                 break;
1019                         }
1020
1021                         SpecialConstraint special = SpecialConstraint.None;
1022                         var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
1023
1024                         if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
1025                                 special |= SpecialConstraint.Struct;
1026                         } else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
1027                                 special = SpecialConstraint.Constructor;
1028                         }
1029
1030                         if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
1031                                 special |= SpecialConstraint.Class;
1032                         }
1033
1034                         TypeParameterSpec spec;
1035                         var def = new ImportedTypeParameterDefinition (type, this);
1036                         if (type.DeclaringMethod != null) {
1037                                 spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
1038                         } else {
1039                                 spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
1040                         }
1041
1042                         return spec;
1043                 }
1044
1045                 //
1046                 // Test for a custom attribute type match. Custom attributes are not really predefined globaly
1047                 // they can be assembly specific therefore we do check based on names only
1048                 //
1049                 public static bool HasAttribute (IList<CustomAttributeData> attributesData, string attrName, string attrNamespace)
1050                 {
1051                         if (attributesData.Count == 0)
1052                                 return false;
1053
1054                         foreach (var attr in attributesData) {
1055                                 var dt = attr.Constructor.DeclaringType;
1056                                 if (dt.Name == attrName && dt.Namespace == attrNamespace)
1057                                         return true;
1058                         }
1059
1060                         return false;
1061                 }
1062
1063                 void ImportTypeBase (TypeSpec spec, MetaType type)
1064                 {
1065                         if (spec.Kind == MemberKind.Interface)
1066                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1067                         else if (type.BaseType != null) {
1068                                 TypeSpec base_type;
1069                                 if (!IsMissingType (type.BaseType) && type.BaseType.IsGenericType)
1070                                         base_type = CreateType (type.BaseType, new DynamicTypeReader (type), true);
1071                                 else
1072                                         base_type = CreateType (type.BaseType);
1073
1074                                 spec.BaseType = base_type;
1075                         }
1076
1077                         if (spec.MemberDefinition.TypeParametersCount > 0) {
1078                                 foreach (var tp in spec.MemberDefinition.TypeParameters) {
1079                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
1080                                 }
1081                         }
1082                 }
1083
1084                 protected void ImportTypes (MetaType[] types, Namespace targetNamespace, bool importExtensionTypes)
1085                 {
1086                         Namespace ns = targetNamespace;
1087                         string prev_namespace = null;
1088                         foreach (var t in types) {
1089                                 if (t == null)
1090                                         continue;
1091
1092                                 // Be careful not to trigger full parent type loading
1093                                 if (t.MemberType == MemberTypes.NestedType)
1094                                         continue;
1095
1096                                 if (t.Name[0] == '<')
1097                                         continue;
1098
1099                                 var it = CreateType (t, null, new DynamicTypeReader (t), true);
1100                                 if (it == null)
1101                                         continue;
1102
1103                                 if (prev_namespace != t.Namespace) {
1104                                         ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
1105                                         prev_namespace = t.Namespace;
1106                                 }
1107
1108                                 // Cannot rely on assembly level Extension attribute or static modifier because they
1109                                 // are not followed by other compilers (e.g. F#).
1110                                 if (it.IsClass && it.Arity == 0 && importExtensionTypes &&
1111                                         HasAttribute (CustomAttributeData.GetCustomAttributes (t), "ExtensionAttribute", CompilerServicesNamespace)) {
1112                                         it.SetExtensionMethodContainer ();
1113                                 }
1114
1115                                 ns.AddType (module, it);
1116                         }
1117                 }
1118
1119                 void ImportTypeParameterTypeConstraints (TypeParameterSpec spec, MetaType type)
1120                 {
1121                         var constraints = type.GetGenericParameterConstraints ();
1122                         List<TypeSpec> tparams = null;
1123                         foreach (var ct in constraints) {
1124                                 if (ct.IsGenericParameter) {
1125                                         if (tparams == null)
1126                                                 tparams = new List<TypeSpec> ();
1127
1128                                         tparams.Add (CreateType (ct));
1129                                         continue;
1130                                 }
1131
1132                                 var constraint_type = CreateType (ct);
1133                                 if (constraint_type.IsClass) {
1134                                         spec.BaseType = constraint_type;
1135                                         continue;
1136                                 }
1137
1138                                 spec.AddInterface (constraint_type);
1139                         }
1140
1141                         if (spec.BaseType == null)
1142                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1143
1144                         if (tparams != null)
1145                                 spec.TypeArguments = tparams.ToArray ();
1146                 }
1147
1148                 Constant ImportConstant (object value)
1149                 {
1150                         //
1151                         // Get type of underlying value as int constant can be used for object
1152                         // parameter type. This is not allowed in C# but other languages can do that
1153                         //
1154                         var types = module.Compiler.BuiltinTypes;
1155                         switch (System.Type.GetTypeCode (value.GetType ())) {
1156                         case TypeCode.Boolean:
1157                                 return new BoolConstant (types, (bool) value, Location.Null);
1158                         case TypeCode.Byte:
1159                                 return new ByteConstant (types, (byte) value, Location.Null);
1160                         case TypeCode.Char:
1161                                 return new CharConstant (types, (char) value, Location.Null);
1162                         case TypeCode.Decimal:
1163                                 return new DecimalConstant (types, (decimal) value, Location.Null);
1164                         case TypeCode.Double:
1165                                 return new DoubleConstant (types, (double) value, Location.Null);
1166                         case TypeCode.Int16:
1167                                 return new ShortConstant (types, (short) value, Location.Null);
1168                         case TypeCode.Int32:
1169                                 return new IntConstant (types, (int) value, Location.Null);
1170                         case TypeCode.Int64:
1171                                 return new LongConstant (types, (long) value, Location.Null);
1172                         case TypeCode.SByte:
1173                                 return new SByteConstant (types, (sbyte) value, Location.Null);
1174                         case TypeCode.Single:
1175                                 return new FloatConstant (types, (float) value, Location.Null);
1176                         case TypeCode.String:
1177                                 return new StringConstant (types, (string) value, Location.Null);
1178                         case TypeCode.UInt16:
1179                                 return new UShortConstant (types, (ushort) value, Location.Null);
1180                         case TypeCode.UInt32:
1181                                 return new UIntConstant (types, (uint) value, Location.Null);
1182                         case TypeCode.UInt64:
1183                                 return new ULongConstant (types, (ulong) value, Location.Null);
1184                         }
1185
1186                         throw new NotImplementedException (value.GetType ().ToString ());
1187                 }
1188
1189                 public TypeSpec ImportType (MetaType type)
1190                 {
1191                         return ImportType (type, new DynamicTypeReader (type));
1192                 }
1193
1194                 TypeSpec ImportType (MetaType type, DynamicTypeReader dtype)
1195                 {
1196                         if (type.HasElementType) {
1197                                 var element = type.GetElementType ();
1198                                 ++dtype.Position;
1199                                 var spec = ImportType (element, dtype);
1200
1201                                 if (type.IsArray)
1202                                         return ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
1203                                 if (type.IsByRef)
1204                                         return ReferenceContainer.MakeType (module, spec);
1205                                 if (type.IsPointer)
1206                                         return PointerContainer.MakeType (module, spec);
1207
1208                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
1209                         }
1210
1211                         TypeSpec compiled_type;
1212                         if (compiled_types.TryGetValue (type, out compiled_type)) {
1213                                 if (compiled_type.BuiltinType == BuiltinTypeSpec.Type.Object && dtype.IsDynamicObject ())
1214                                         return module.Compiler.BuiltinTypes.Dynamic;
1215
1216                                 return compiled_type;
1217                         }
1218
1219                         return CreateType (type, dtype, true);
1220                 }
1221
1222                 static bool IsMissingType (MetaType type)
1223                 {
1224 #if STATIC
1225                         return type.__IsMissing;
1226 #else
1227                         return false;
1228 #endif
1229                 }
1230
1231                 //
1232                 // Decimal constants cannot be encoded in the constant blob, and thus are marked
1233                 // as IsInitOnly ('readonly' in C# parlance).  We get its value from the
1234                 // DecimalConstantAttribute metadata.
1235                 //
1236                 Constant ReadDecimalConstant (IList<CustomAttributeData> attrs)
1237                 {
1238                         if (attrs.Count == 0)
1239                                 return null;
1240
1241                         foreach (var ca in attrs) {
1242                                 var dt = ca.Constructor.DeclaringType;
1243                                 if (dt.Name != "DecimalConstantAttribute" || dt.Namespace != CompilerServicesNamespace)
1244                                         continue;
1245
1246                                 var value = new decimal (
1247                                         (int) (uint) ca.ConstructorArguments[4].Value,
1248                                         (int) (uint) ca.ConstructorArguments[3].Value,
1249                                         (int) (uint) ca.ConstructorArguments[2].Value,
1250                                         (byte) ca.ConstructorArguments[1].Value != 0,
1251                                         (byte) ca.ConstructorArguments[0].Value);
1252
1253                                 return new DecimalConstant (module.Compiler.BuiltinTypes, value, Location.Null);
1254                         }
1255
1256                         return null;
1257                 }
1258
1259                 static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
1260                 {
1261                         Modifiers mod;
1262                         var ma = mb.Attributes;
1263                         switch (ma & MethodAttributes.MemberAccessMask) {
1264                         case MethodAttributes.Public:
1265                                 mod = Modifiers.PUBLIC;
1266                                 break;
1267                         case MethodAttributes.Assembly:
1268                                 mod = Modifiers.INTERNAL;
1269                                 break;
1270                         case MethodAttributes.Family:
1271                                 mod = Modifiers.PROTECTED;
1272                                 break;
1273                         case MethodAttributes.FamORAssem:
1274                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
1275                                 break;
1276                         default:
1277                                 mod = Modifiers.PRIVATE;
1278                                 break;
1279                         }
1280
1281                         if ((ma & MethodAttributes.Static) != 0) {
1282                                 mod |= Modifiers.STATIC;
1283                                 return mod;
1284                         }
1285                         if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
1286                                 mod |= Modifiers.ABSTRACT;
1287                                 return mod;
1288                         }
1289
1290                         // It can be sealed and override
1291                         if ((ma & MethodAttributes.Final) != 0)
1292                                 mod |= Modifiers.SEALED;
1293
1294                         if ((ma & MethodAttributes.Virtual) != 0) {
1295                                 // Not every member can be detected based on MethodAttribute, we
1296                                 // set virtual or non-virtual only when we are certain. Further checks
1297                                 // to really find out what `virtual' means for this member are done
1298                                 // later
1299                                 if ((ma & MethodAttributes.NewSlot) != 0) {
1300                                         if ((mod & Modifiers.SEALED) != 0) {
1301                                                 mod &= ~Modifiers.SEALED;
1302                                         } else {
1303                                                 mod |= Modifiers.VIRTUAL;
1304                                         }
1305                                 } else {
1306                                         mod |= Modifiers.OVERRIDE;
1307                                 }
1308                         }
1309
1310                         return mod;
1311                 }
1312         }
1313
1314         abstract class ImportedDefinition : IMemberDefinition
1315         {
1316                 protected class AttributesBag
1317                 {
1318                         public static readonly AttributesBag Default = new AttributesBag ();
1319
1320                         public AttributeUsageAttribute AttributeUsage;
1321                         public ObsoleteAttribute Obsolete;
1322                         public string[] Conditionals;
1323                         public string DefaultIndexerName;
1324                         public bool? CLSAttributeValue;
1325                         public TypeSpec CoClass;
1326
1327                         static bool HasMissingType (ConstructorInfo ctor)
1328                         {
1329 #if STATIC
1330                                 //
1331                                 // Mimic odd csc behaviour where missing type on predefined
1332                                 // attributes means the attribute is silently ignored. This can
1333                                 // happen with PCL facades
1334                                 //
1335                                 foreach (var p in ctor.GetParameters ()) {
1336                                         if (p.ParameterType.__ContainsMissingType)
1337                                                 return true;
1338                                 }
1339 #endif
1340
1341                                 return false;
1342                         }
1343
1344                         public static AttributesBag Read (MemberInfo mi, MetadataImporter importer)
1345                         {
1346                                 AttributesBag bag = null;
1347                                 List<string> conditionals = null;
1348
1349                                 // It should not throw any loading exception
1350                                 IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
1351
1352                                 foreach (var a in attrs) {
1353                                         var dt = a.Constructor.DeclaringType;
1354                                         string name = dt.Name;
1355                                         if (name == "ObsoleteAttribute") {
1356                                                 if (dt.Namespace != "System")
1357                                                         continue;
1358
1359                                                 if (bag == null)
1360                                                         bag = new AttributesBag ();
1361
1362                                                 var args = a.ConstructorArguments;
1363
1364                                                 if (args.Count == 1) {
1365                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
1366                                                 } else if (args.Count == 2) {
1367                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
1368                                                 } else {
1369                                                         bag.Obsolete = new ObsoleteAttribute ();
1370                                                 }
1371
1372                                                 continue;
1373                                         }
1374
1375                                         if (name == "ConditionalAttribute") {
1376                                                 if (dt.Namespace != "System.Diagnostics")
1377                                                         continue;
1378
1379                                                 if (bag == null)
1380                                                         bag = new AttributesBag ();
1381
1382                                                 if (conditionals == null)
1383                                                         conditionals = new List<string> (2);
1384
1385                                                 conditionals.Add ((string) a.ConstructorArguments[0].Value);
1386                                                 continue;
1387                                         }
1388
1389                                         if (name == "CLSCompliantAttribute") {
1390                                                 if (dt.Namespace != "System")
1391                                                         continue;
1392
1393                                                 if (bag == null)
1394                                                         bag = new AttributesBag ();
1395
1396                                                 bag.CLSAttributeValue = (bool) a.ConstructorArguments[0].Value;
1397                                                 continue;
1398                                         }
1399
1400                                         // Type only attributes
1401                                         if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
1402                                                 if (name == "DefaultMemberAttribute") {
1403                                                         if (dt.Namespace != "System.Reflection")
1404                                                                 continue;
1405
1406                                                         if (bag == null)
1407                                                                 bag = new AttributesBag ();
1408
1409                                                         bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
1410                                                         continue;
1411                                                 }
1412
1413                                                 if (name == "AttributeUsageAttribute") {
1414                                                         if (dt.Namespace != "System")
1415                                                                 continue;
1416
1417                                                         if (HasMissingType (a.Constructor))
1418                                                                 continue;
1419
1420                                                         if (bag == null)
1421                                                                 bag = new AttributesBag ();
1422
1423                                                         bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
1424                                                         foreach (var named in a.NamedArguments) {
1425                                                                 if (named.MemberInfo.Name == "AllowMultiple")
1426                                                                         bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
1427                                                                 else if (named.MemberInfo.Name == "Inherited")
1428                                                                         bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
1429                                                         }
1430                                                         continue;
1431                                                 }
1432
1433                                                 // Interface only attribute
1434                                                 if (name == "CoClassAttribute") {
1435                                                         if (dt.Namespace != "System.Runtime.InteropServices")
1436                                                                 continue;
1437
1438                                                         if (HasMissingType (a.Constructor))
1439                                                                 continue;
1440
1441                                                         if (bag == null)
1442                                                                 bag = new AttributesBag ();
1443
1444                                                         bag.CoClass = importer.ImportType ((MetaType) a.ConstructorArguments[0].Value);
1445                                                         continue;
1446                                                 }
1447                                         }
1448                                 }
1449
1450                                 if (bag == null)
1451                                         return Default;
1452
1453                                 if (conditionals != null)
1454                                         bag.Conditionals = conditionals.ToArray ();
1455
1456                                 return bag;
1457                         }
1458                 }
1459
1460                 protected readonly MemberInfo provider;
1461                 protected AttributesBag cattrs;
1462                 protected readonly MetadataImporter importer;
1463
1464                 protected ImportedDefinition (MemberInfo provider, MetadataImporter importer)
1465                 {
1466                         this.provider = provider;
1467                         this.importer = importer;
1468                 }
1469
1470                 #region Properties
1471
1472                 public bool IsImported {
1473                         get {
1474                                 return true;
1475                         }
1476                 }
1477
1478                 public virtual string Name {
1479                         get {
1480                                 return provider.Name;
1481                         }
1482                 }
1483
1484                 #endregion
1485
1486                 public string[] ConditionalConditions ()
1487                 {
1488                         if (cattrs == null)
1489                                 ReadAttributes ();
1490
1491                         return cattrs.Conditionals;
1492                 }
1493
1494                 public ObsoleteAttribute GetAttributeObsolete ()
1495                 {
1496                         if (cattrs == null)
1497                                 ReadAttributes ();
1498
1499                         return cattrs.Obsolete;
1500                 }
1501
1502                 public bool? CLSAttributeValue {
1503                         get {
1504                                 if (cattrs == null)
1505                                         ReadAttributes ();
1506
1507                                 return cattrs.CLSAttributeValue;
1508                         }
1509                 }
1510
1511                 protected void ReadAttributes ()
1512                 {
1513                         cattrs = AttributesBag.Read (provider, importer);
1514                 }
1515
1516                 public void SetIsAssigned ()
1517                 {
1518                         // Unused for imported members
1519                 }
1520
1521                 public void SetIsUsed ()
1522                 {
1523                         // Unused for imported members
1524                 }
1525         }
1526
1527         public class ImportedModuleDefinition
1528         {
1529                 readonly Module module;
1530                 bool cls_compliant;
1531
1532                 public ImportedModuleDefinition (Module module)
1533                 {
1534                         this.module = module;
1535                 }
1536
1537                 #region Properties
1538
1539                 public bool IsCLSCompliant {
1540                         get {
1541                                 return cls_compliant;
1542                         }
1543                 }
1544
1545                 public string Name {
1546                         get {
1547                                 return module.Name;
1548                         }
1549                 }
1550
1551                 #endregion
1552
1553                 public void ReadAttributes ()
1554                 {
1555                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
1556
1557                         foreach (var a in attrs) {
1558                                 var dt = a.Constructor.DeclaringType;
1559                                 if (dt.Name == "CLSCompliantAttribute") {
1560                                         if (dt.Namespace != "System")
1561                                                 continue;
1562
1563                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1564                                         continue;
1565                                 }
1566                         }
1567                 }
1568
1569                 //
1570                 // Reads assembly attributes which where attached to a special type because
1571                 // module does have assembly manifest
1572                 //
1573                 public List<Attribute> ReadAssemblyAttributes ()
1574                 {
1575                         var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
1576                         if (t == null)
1577                                 return null;
1578
1579                         var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
1580                         if (field == null)
1581                                 return null;
1582
1583                         // TODO: implement, the idea is to fabricate specil Attribute class and
1584                         // add it to OptAttributes before resolving the source code attributes
1585                         // Need to build module location as well for correct error reporting
1586
1587                         //var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
1588                         //var attrs = new List<Attribute> (assembly_attributes.Count);
1589                         //foreach (var a in assembly_attributes)
1590                         //{
1591                         //    var type = metaImporter.ImportType (a.Constructor.DeclaringType);
1592                         //    var ctor = metaImporter.CreateMethod (a.Constructor, type);
1593
1594                         //    foreach (var carg in a.ConstructorArguments) {
1595                         //        carg.Value
1596                         //    }
1597
1598                         //    attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
1599                         //}
1600
1601                         return null;
1602                 }
1603         }
1604
1605         public class ImportedAssemblyDefinition : IAssemblyDefinition
1606         {
1607                 readonly Assembly assembly;
1608                 readonly AssemblyName aname;
1609                 bool cls_compliant;
1610
1611                 List<AssemblyName> internals_visible_to;
1612                 Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
1613
1614                 public ImportedAssemblyDefinition (Assembly assembly)
1615                 {
1616                         this.assembly = assembly;
1617                         this.aname = assembly.GetName ();
1618                 }
1619
1620                 #region Properties
1621
1622                 public Assembly Assembly {
1623                         get {
1624                                 return assembly;
1625                         }
1626                 }
1627
1628                 public string FullName {
1629                         get {
1630                                 return aname.FullName;
1631                         }
1632                 }
1633
1634                 public bool HasStrongName {
1635                         get {
1636                                 return aname.GetPublicKey ().Length != 0;
1637                         }
1638                 }
1639
1640                 public bool IsMissing {
1641                         get {
1642 #if STATIC
1643                                 return assembly.__IsMissing;
1644 #else
1645                                 return false;
1646 #endif
1647                         }
1648                 }
1649
1650                 public bool IsCLSCompliant {
1651                         get {
1652                                 return cls_compliant;
1653                         }
1654                 }
1655
1656                 public string Location {
1657                         get {
1658                                 return assembly.Location;
1659                         }
1660                 }
1661
1662                 public string Name {
1663                         get {
1664                                 return aname.Name;
1665                         }
1666                 }
1667
1668                 #endregion
1669
1670                 public byte[] GetPublicKeyToken ()
1671                 {
1672                         return aname.GetPublicKeyToken ();
1673                 }
1674
1675                 public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
1676                 {
1677                         return internals_visible_to_cache [assembly];
1678                 }
1679
1680                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1681                 {
1682                         if (internals_visible_to == null)
1683                                 return false;
1684
1685                         AssemblyName is_visible = null;
1686                         if (internals_visible_to_cache == null) {
1687                                 internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
1688                         } else {
1689                                 if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
1690                                         return is_visible != null;
1691                         }
1692
1693                         var token = assembly.GetPublicKeyToken ();
1694                         if (token != null && token.Length == 0)
1695                                 token = null;
1696
1697                         foreach (var internals in internals_visible_to) {
1698                                 if (internals.Name != assembly.Name)
1699                                         continue;
1700
1701                                 if (token == null && assembly is AssemblyDefinition) {
1702                                         is_visible = internals;
1703                                         break;
1704                                 }
1705
1706                                 if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
1707                                         continue;
1708
1709                                 is_visible = internals;
1710                                 break;
1711                         }
1712
1713                         internals_visible_to_cache.Add (assembly, is_visible);
1714                         return is_visible != null;
1715                 }
1716
1717                 public void ReadAttributes ()
1718                 {
1719 #if STATIC
1720                         if (assembly.__IsMissing)
1721                                 return;
1722 #endif
1723
1724                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
1725
1726                         foreach (var a in attrs) {
1727                                 var dt = a.Constructor.DeclaringType;
1728                                 var name = dt.Name;
1729                                 if (name == "CLSCompliantAttribute") {
1730                                         if (dt.Namespace == "System") {
1731                                                 cls_compliant = (bool) a.ConstructorArguments[0].Value;
1732                                         }
1733                                         continue;
1734                                 }
1735
1736                                 if (name == "InternalsVisibleToAttribute") {
1737                                         if (dt.Namespace != MetadataImporter.CompilerServicesNamespace)
1738                                                 continue;
1739
1740                                         string s = a.ConstructorArguments[0].Value as string;
1741                                         if (s == null)
1742                                                 continue;
1743
1744                                         AssemblyName an;
1745                                         try {
1746                                                 an = new AssemblyName (s);
1747                                         } catch (FileLoadException) {
1748                                                 // Invalid assembly name reuses FileLoadException
1749                                                 continue;
1750                                         }
1751
1752                                         if (internals_visible_to == null)
1753                                                 internals_visible_to = new List<AssemblyName> ();
1754
1755                                         internals_visible_to.Add (an);
1756                                         continue;
1757                                 }
1758                         }
1759                 }
1760
1761                 public override string ToString ()
1762                 {
1763                         return FullName;
1764                 }
1765         }
1766
1767         class ImportedMemberDefinition : ImportedDefinition
1768         {
1769                 readonly TypeSpec type;
1770
1771                 public ImportedMemberDefinition (MemberInfo member, TypeSpec type, MetadataImporter importer)
1772                         : base (member, importer)
1773                 {
1774                         this.type = type;
1775                 }
1776
1777                 #region Properties
1778
1779                 public TypeSpec MemberType {
1780                         get {
1781                                 return type;
1782                         }
1783                 }
1784
1785                 #endregion
1786         }
1787
1788         class ImportedParameterMemberDefinition : ImportedMemberDefinition, IParametersMember
1789         {
1790                 readonly AParametersCollection parameters;
1791
1792                 protected ImportedParameterMemberDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1793                         : base (provider, type, importer)
1794                 {
1795                         this.parameters = parameters;
1796                 }
1797
1798                 public ImportedParameterMemberDefinition (PropertyInfo provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1799                         : base (provider, type, importer)
1800                 {
1801                         this.parameters = parameters;
1802                 }
1803
1804                 #region Properties
1805
1806                 public AParametersCollection Parameters {
1807                         get {
1808                                 return parameters;
1809                         }
1810                 }
1811
1812                 #endregion
1813         }
1814
1815         class ImportedMethodDefinition : ImportedParameterMemberDefinition, IMethodDefinition
1816         {
1817                 public ImportedMethodDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1818                         : base (provider, type, parameters, importer)
1819                 {
1820                 }
1821
1822                 MethodBase IMethodDefinition.Metadata {
1823                         get {
1824                                 return (MethodBase) provider;
1825                         }
1826                 }
1827         }
1828
1829         class ImportedGenericMethodDefinition : ImportedMethodDefinition, IGenericMethodDefinition
1830         {
1831                 readonly TypeParameterSpec[] tparams;
1832
1833                 public ImportedGenericMethodDefinition (MethodInfo provider, TypeSpec type, AParametersCollection parameters, TypeParameterSpec[] tparams, MetadataImporter importer)
1834                         : base (provider, type, parameters, importer)
1835                 {
1836                         this.tparams = tparams;
1837                 }
1838
1839                 #region Properties
1840
1841                 public TypeParameterSpec[] TypeParameters {
1842                         get {
1843                                 return tparams;
1844                         }
1845                 }
1846
1847                 public int TypeParametersCount {
1848                         get {
1849                                 return tparams.Length;
1850                         }
1851                 }
1852
1853                 #endregion
1854         }
1855
1856         class ImportedTypeDefinition : ImportedDefinition, ITypeDefinition
1857         {
1858                 TypeParameterSpec[] tparams;
1859                 string name;
1860
1861                 public ImportedTypeDefinition (MetaType type, MetadataImporter importer)
1862                         : base (type, importer)
1863                 {
1864                 }
1865
1866                 #region Properties
1867
1868                 public IAssemblyDefinition DeclaringAssembly {
1869                         get {
1870                                 return importer.GetAssemblyDefinition (provider.Module.Assembly);
1871                         }
1872                 }
1873
1874                 bool ITypeDefinition.IsComImport {
1875                         get {
1876                                 return ((MetaType) provider).IsImport;
1877                         }
1878                 }
1879
1880
1881                 bool ITypeDefinition.IsPartial {
1882                         get {
1883                                 return false;
1884                         }
1885                 }
1886
1887                 bool ITypeDefinition.IsTypeForwarder {
1888                         get {
1889 #if STATIC
1890                                 return ((MetaType) provider).__IsTypeForwarder;
1891 #else
1892                                 return false;
1893 #endif
1894                         }
1895                 }
1896
1897                 bool ITypeDefinition.IsCyclicTypeForwarder {
1898                         get {
1899 #if STATIC
1900                                 return ((MetaType) provider).__IsCyclicTypeForwarder;
1901 #else
1902                                 return false;
1903 #endif
1904                         }
1905                 }
1906
1907                 public override string Name {
1908                         get {
1909                                 if (name == null) {
1910                                         name = base.Name;
1911                                         if (tparams != null) {
1912                                                 int arity_start = name.IndexOf ('`');
1913                                                 if (arity_start > 0)
1914                                                         name = name.Substring (0, arity_start);
1915                                         }
1916                                 }
1917
1918                                 return name;
1919                         }
1920                 }
1921
1922                 public string Namespace {
1923                         get {
1924                                 return ((MetaType) provider).Namespace;
1925                         }
1926                 }
1927
1928                 public int TypeParametersCount {
1929                         get {
1930                                 return tparams == null ? 0 : tparams.Length;
1931                         }
1932                 }
1933
1934                 public TypeParameterSpec[] TypeParameters {
1935                         get {
1936                                 return tparams;
1937                         }
1938                         set {
1939                                 tparams = value;
1940                         }
1941                 }
1942
1943                 #endregion
1944
1945                 public void DefineInterfaces (TypeSpec spec)
1946                 {
1947                         var type = (MetaType) provider;
1948                         MetaType[] ifaces;
1949 #if STATIC
1950                         ifaces = type.__GetDeclaredInterfaces ();
1951                         if (ifaces.Length != 0) {
1952                                 foreach (var iface in ifaces) {
1953                                         var it = importer.CreateType (iface);
1954                                         if (it == null)
1955                                                 continue;
1956
1957                                         spec.AddInterfaceDefined (it);
1958
1959                                         // Unfortunately not all languages expand inherited interfaces
1960                                         var bifaces = it.Interfaces;
1961                                         if (bifaces != null) {
1962                                                 foreach (var biface in bifaces) {
1963                                                         spec.AddInterfaceDefined (biface);
1964                                                 }
1965                                         }
1966                                 }
1967                         }
1968
1969                         //
1970                         // It's impossible to get declared interfaces only using System.Reflection
1971                         // hence we need to mimic the behavior with ikvm-reflection too to keep
1972                         // our type look-up logic same
1973                         //
1974                         if (spec.BaseType != null) {
1975                                 var bifaces = spec.BaseType.Interfaces;
1976                                 if (bifaces != null) {
1977                                         //
1978                                         // Before adding base class interfaces close defined interfaces
1979                                         // on type parameter
1980                                         //
1981                                         var tp = spec as TypeParameterSpec;
1982                                         if (tp != null && tp.InterfacesDefined == null) {
1983                                                 tp.InterfacesDefined = TypeSpec.EmptyTypes;
1984                                         }
1985
1986                                         foreach (var iface in bifaces)
1987                                                 spec.AddInterfaceDefined (iface);
1988                                 }
1989                         }
1990 #else
1991                         ifaces = type.GetInterfaces ();
1992
1993                         if (ifaces.Length > 0) {
1994                                 foreach (var iface in ifaces) {
1995                                         spec.AddInterface (importer.CreateType (iface));
1996                                 }
1997                         }
1998 #endif
1999
2000                 }
2001
2002                 public static void Error_MissingDependency (IMemberContext ctx, List<MissingTypeSpecReference> missing, Location loc)
2003                 {
2004                         //
2005                         // Report details about missing type and most likely cause of the problem.
2006                         // csc used to reports 1683, 1684 (now 7069) as warnings but we report them only when used
2007                         // or referenced from the user core in which case compilation error has to
2008                         // be reported because compiler cannot continue anyway
2009                         //
2010
2011                         var report = ctx.Module.Compiler.Report;
2012
2013                         for (int i = 0; i < missing.Count; ++i) {
2014                                 var t = missing [i].Type;
2015
2016                                 //
2017                                 // Report missing types only once
2018                                 //
2019                                 if (report.Printer.MissingTypeReported (t.MemberDefinition))
2020                                         continue;
2021
2022                                 string name = t.GetSignatureForError ();
2023
2024                                 var caller = missing[i].Caller;
2025                                 if (caller.Kind != MemberKind.MissingType)
2026                                         report.SymbolRelatedToPreviousError (caller);
2027
2028                                 var definition = t.MemberDefinition;
2029                                 if (definition.DeclaringAssembly == ctx.Module.DeclaringAssembly) {
2030                                         report.Error (1683, loc,
2031                                                 "Reference to type `{0}' claims it is defined in this assembly, but it is not defined in source or any added modules",
2032                                                 name);
2033                                 } else if (definition.DeclaringAssembly.IsMissing) {
2034                                         if (definition.IsTypeForwarder) {
2035                                                 report.Error (1070, loc,
2036                                                         "The type `{0}' has been forwarded to an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
2037                                                         name, definition.DeclaringAssembly.FullName);
2038                                         } else {
2039                                                 report.Error (12, loc,
2040                                                         "The type `{0}' is defined in an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
2041                                                         name, definition.DeclaringAssembly.FullName);
2042                                         }
2043                                 } else if (definition.IsTypeForwarder) {
2044                                         report.Error (731, loc, "The type forwarder for type `{0}' in assembly `{1}' has circular dependency",
2045                                                 name, definition.DeclaringAssembly.FullName);
2046                                 } else {
2047                                         report.Error (7069, loc,
2048                                                 "Reference to type `{0}' claims it is defined assembly `{1}', but it could not be found",
2049                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
2050                                 }
2051                         }
2052                 }
2053
2054                 public TypeSpec GetAttributeCoClass ()
2055                 {
2056                         if (cattrs == null)
2057                                 ReadAttributes ();
2058
2059                         return cattrs.CoClass;
2060                 }
2061
2062                 public string GetAttributeDefaultMember ()
2063                 {
2064                         if (cattrs == null)
2065                                 ReadAttributes ();
2066
2067                         return cattrs.DefaultIndexerName;
2068                 }
2069
2070                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2071                 {
2072                         if (cattrs == null)
2073                                 ReadAttributes ();
2074
2075                         return cattrs.AttributeUsage;
2076                 }
2077
2078                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2079                 {
2080                         var a = importer.GetAssemblyDefinition (provider.Module.Assembly);
2081                         return a == assembly || a.IsFriendAssemblyTo (assembly);
2082                 }
2083
2084                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2085                 {
2086                         //
2087                         // Not interested in members of nested private types unless the importer needs them
2088                         //
2089                         if (declaringType.IsPrivate && importer.IgnorePrivateMembers) {
2090                                 cache = MemberCache.Empty;
2091                                 return;
2092                         }
2093
2094                         var loading_type = (MetaType) provider;
2095                         const BindingFlags all_members = BindingFlags.DeclaredOnly |
2096                                 BindingFlags.Static | BindingFlags.Instance |
2097                                 BindingFlags.Public | BindingFlags.NonPublic;
2098
2099                         const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
2100                                         MethodAttributes.Virtual | MethodAttributes.HideBySig |
2101                                         MethodAttributes.Final;
2102
2103                         Dictionary<MethodBase, MethodSpec> possible_accessors = null;
2104                         List<EventSpec> imported_events = null;
2105                         EventSpec event_spec;
2106                         MemberSpec imported;
2107                         MethodInfo m;
2108                         MemberInfo[] all;
2109                         try {
2110                                 all = loading_type.GetMembers (all_members);
2111                         } catch (Exception e) {
2112                                 throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
2113                                         declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
2114                         }
2115
2116                         if (cache == null) {
2117                                 cache = new MemberCache (all.Length);
2118
2119                                 //
2120                                 // Do the types first as they can be referenced by the members before
2121                                 // they are found or inflated
2122                                 //
2123                                 foreach (var member in all) {
2124                                         if (member.MemberType != MemberTypes.NestedType)
2125                                                 continue;
2126
2127                                         var t = (MetaType) member;
2128
2129                                         // Ignore compiler generated types, mostly lambda containers
2130                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2131                                                 continue;
2132
2133                                         try {
2134                                                 imported = importer.CreateNestedType (t, declaringType);
2135                                         } catch (Exception e) {
2136                                                 throw new InternalErrorException (e, "Could not import nested type `{0}' from `{1}'",
2137                                                         t.FullName, declaringType.MemberDefinition.DeclaringAssembly.FullName);
2138                                         }
2139
2140                                         cache.AddMemberImported (imported);
2141                                 }
2142
2143                                 foreach (var member in all) {
2144                                         if (member.MemberType != MemberTypes.NestedType)
2145                                                 continue;
2146
2147                                         var t = (MetaType) member;
2148
2149                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2150                                                 continue;
2151
2152                                         importer.ImportTypeBase (t);
2153                                 }
2154                         }
2155
2156                         //
2157                         // Load base interfaces first to minic behaviour of compiled members
2158                         //
2159                         if (declaringType.IsInterface && declaringType.Interfaces != null) {
2160                                 foreach (var iface in declaringType.Interfaces) {
2161                                         cache.AddInterface (iface);
2162                                 }
2163                         }
2164
2165                         if (!onlyTypes) {
2166                                 //
2167                                 // The logic here requires methods to be returned first which seems to work for both Mono and .NET
2168                                 //
2169                                 foreach (var member in all) {
2170                                         switch (member.MemberType) {
2171                                         case MemberTypes.Constructor:
2172                                                 if (declaringType.IsInterface)
2173                                                         continue;
2174
2175                                                 goto case MemberTypes.Method;
2176                                         case MemberTypes.Method:
2177                                                 MethodBase mb = (MethodBase) member;
2178                                                 var attrs = mb.Attributes;
2179
2180                                                 if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
2181                                                         if (importer.IgnorePrivateMembers)
2182                                                                 continue;
2183
2184                                                         // Ignore explicitly implemented members
2185                                                         if ((attrs & explicit_impl) == explicit_impl)
2186                                                                 continue;
2187
2188                                                         // Ignore compiler generated methods
2189                                                         if (MetadataImporter.HasAttribute (CustomAttributeData.GetCustomAttributes (mb), "CompilerGeneratedAttribute", MetadataImporter.CompilerServicesNamespace))
2190                                                                 continue;
2191                                                 }
2192
2193                                                 imported = importer.CreateMethod (mb, declaringType);
2194                                                 if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
2195                                                         if (possible_accessors == null)
2196                                                                 possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
2197
2198                                                         // There are no metadata rules for accessors, we have to consider any method as possible candidate
2199                                                         possible_accessors.Add (mb, (MethodSpec) imported);
2200                                                 }
2201
2202                                                 break;
2203                                         case MemberTypes.Property:
2204                                                 if (possible_accessors == null)
2205                                                         continue;
2206
2207                                                 var p = (PropertyInfo) member;
2208                                                 //
2209                                                 // Links possible accessors with property
2210                                                 //
2211                                                 MethodSpec get, set;
2212                                                 m = p.GetGetMethod (true);
2213                                                 if (m == null || !possible_accessors.TryGetValue (m, out get))
2214                                                         get = null;
2215
2216                                                 m = p.GetSetMethod (true);
2217                                                 if (m == null || !possible_accessors.TryGetValue (m, out set))
2218                                                         set = null;
2219
2220                                                 // No accessors registered (e.g. explicit implementation)
2221                                                 if (get == null && set == null)
2222                                                         continue;
2223
2224                                                 try {
2225                                                         imported = importer.CreateProperty (p, declaringType, get, set);
2226                                                 } catch (Exception ex) {
2227                                                         throw new InternalErrorException (ex, "Could not import property `{0}' inside `{1}'",
2228                                                                 p.Name, declaringType.GetSignatureForError ());
2229                                                 }
2230
2231                                                 if (imported == null)
2232                                                         continue;
2233
2234                                                 break;
2235                                         case MemberTypes.Event:
2236                                                 if (possible_accessors == null)
2237                                                         continue;
2238
2239                                                 var e = (EventInfo) member;
2240                                                 //
2241                                                 // Links accessors with event
2242                                                 //
2243                                                 MethodSpec add, remove;
2244                                                 m = e.GetAddMethod (true);
2245                                                 if (m == null || !possible_accessors.TryGetValue (m, out add))
2246                                                         add = null;
2247
2248                                                 m = e.GetRemoveMethod (true);
2249                                                 if (m == null || !possible_accessors.TryGetValue (m, out remove))
2250                                                         remove = null;
2251
2252                                                 // Both accessors are required
2253                                                 if (add == null || remove == null)
2254                                                         continue;
2255
2256                                                 event_spec = importer.CreateEvent (e, declaringType, add, remove);
2257                                                 if (!importer.IgnorePrivateMembers) {
2258                                                         if (imported_events == null)
2259                                                                 imported_events = new List<EventSpec> ();
2260
2261                                                         imported_events.Add (event_spec);
2262                                                 }
2263
2264                                                 imported = event_spec;
2265                                                 break;
2266                                         case MemberTypes.Field:
2267                                                 var fi = (FieldInfo) member;
2268
2269                                                 imported = importer.CreateField (fi, declaringType);
2270                                                 if (imported == null)
2271                                                         continue;
2272
2273                                                 //
2274                                                 // For dynamic binder event has to be fully restored to allow operations
2275                                                 // within the type container to work correctly
2276                                                 //
2277                                                 if (imported_events != null) {
2278                                                         // The backing event field should be private but it may not
2279                                                         int i;
2280                                                         for (i = 0; i < imported_events.Count; ++i) {
2281                                                                 var ev = imported_events[i];
2282                                                                 if (ev.Name == fi.Name) {
2283                                                                         ev.BackingField = (FieldSpec) imported;
2284                                                                         imported_events.RemoveAt (i);
2285                                                                         i = -1;
2286                                                                         break;
2287                                                                 }
2288                                                         }
2289
2290                                                         if (i < 0)
2291                                                                 continue;
2292                                                 }
2293
2294                                                 break;
2295                                         case MemberTypes.NestedType:
2296                                                 // Already in the cache from the first pass
2297                                                 continue;
2298                                         default:
2299                                                 throw new NotImplementedException (member.ToString ());
2300                                         }
2301
2302                                         if (imported.IsStatic && declaringType.IsInterface)
2303                                                 continue;
2304
2305                                         cache.AddMemberImported (imported);
2306                                 }
2307                         }
2308                 }
2309         }
2310
2311         class ImportedTypeParameterDefinition : ImportedDefinition, ITypeDefinition
2312         {
2313                 public ImportedTypeParameterDefinition (MetaType type, MetadataImporter importer)
2314                         : base (type, importer)
2315                 {
2316                 }
2317
2318                 #region Properties
2319
2320                 public IAssemblyDefinition DeclaringAssembly {
2321                         get {
2322                                 throw new NotImplementedException ();
2323                         }
2324                 }
2325
2326                 bool ITypeDefinition.IsComImport {
2327                         get {
2328                                 return false;
2329                         }
2330                 }
2331
2332                 bool ITypeDefinition.IsPartial {
2333                         get {
2334                                 return false;
2335                         }
2336                 }
2337
2338                 bool ITypeDefinition.IsTypeForwarder {
2339                         get {
2340                                 return false;
2341                         }
2342                 }
2343
2344                 bool ITypeDefinition.IsCyclicTypeForwarder {
2345                         get {
2346                                 return false;
2347                         }
2348                 }
2349
2350                 public string Namespace {
2351                         get {
2352                                 return null;
2353                         }
2354                 }
2355
2356                 public int TypeParametersCount {
2357                         get {
2358                                 return 0;
2359                         }
2360                 }
2361
2362                 public TypeParameterSpec[] TypeParameters {
2363                         get {
2364                                 return null;
2365                         }
2366                 }
2367
2368                 #endregion
2369
2370                 public TypeSpec GetAttributeCoClass ()
2371                 {
2372                         return null;
2373                 }
2374
2375                 public string GetAttributeDefaultMember ()
2376                 {
2377                         throw new NotSupportedException ();
2378                 }
2379
2380                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2381                 {
2382                         throw new NotSupportedException ();
2383                 }
2384
2385                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2386                 {
2387                         throw new NotImplementedException ();
2388                 }
2389
2390                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2391                 {
2392                         throw new NotImplementedException ();
2393                 }
2394         }
2395 }