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 = GetDeclaringTypesTypeParametersCount (spec);
 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                 static int GetDeclaringTypesTypeParametersCount (TypeSpec spec)
 385                 {
 386                         int total = 0;
 387                         while (spec.DeclaringType != null) {
 388                                 total += spec.DeclaringType.MemberDefinition.TypeParametersCount;
 389                                 spec = spec.DeclaringType;
 390                         }
 391
 392                         return total;
 393                 }
 394
 395                 public MethodSpec CreateMethod (MethodBase mb, TypeSpec declaringType)
 396                 {
 397                         Modifiers mod = ReadMethodModifiers (mb, declaringType);
 398                         TypeParameterSpec[] tparams;
 399
 400                         var parameters = CreateParameters (declaringType, mb.GetParameters (), mb);
 401
 402                         if (mb.IsGenericMethod) {
 403                                 if (!mb.IsGenericMethodDefinition)
 404                                         throw new NotSupportedException ("assert");
 405
 406                                 tparams = CreateGenericParameters (0, mb.GetGenericArguments ());
 407                         } else {
 408                                 tparams = null;
 409                         }
 410
 411                         MemberKind kind;
 412                         TypeSpec returnType;
 413                         if (mb.MemberType == MemberTypes.Constructor) {
 414                                 kind = MemberKind.Constructor;
 415                                 returnType = module.Compiler.BuiltinTypes.Void;
 416                         } else {
 417                                 //
 418                                 // Detect operators and destructors
 419                                 //
 420                                 string name = mb.Name;
 421                                 kind = MemberKind.Method;
 422                                 if (tparams == null && !mb.DeclaringType.IsInterface && name.Length > 6) {
 423                                         if ((mod & (Modifiers.STATIC | Modifiers.PUBLIC)) == (Modifiers.STATIC | Modifiers.PUBLIC)) {
 424                                                 if (name[2] == '_' && name[1] == 'p' && name[0] == 'o' && (mb.Attributes & MethodAttributes.SpecialName) != 0) {
 425                                                         var op_type = Operator.GetType (name);
 426                                                         if (op_type.HasValue && parameters.Count > 0 && parameters.Count < 3) {
 427                                                                 kind = MemberKind.Operator;
 428                                                         }
 429                                                 }
 430                                         } else if (parameters.IsEmpty && name == Destructor.MetadataName) {
 431                                                 kind = MemberKind.Destructor;
 432                                                 if (declaringType.BuiltinType == BuiltinTypeSpec.Type.Object) {
 433                                                         mod &= ~Modifiers.OVERRIDE;
 434                                                         mod |= Modifiers.VIRTUAL;
 435                                                 }
 436                                         }
 437                                 }
 438
 439                                 var mi = (MethodInfo) mb;
 440                                 returnType = ImportType (mi.ReturnType, new DynamicTypeReader (mi.ReturnParameter));
 441
 442                                 // Cannot set to OVERRIDE without full hierarchy checks
 443                                 // this flag indicates that the method could be override
 444                                 // but further validation is needed
 445                                 if ((mod & Modifiers.OVERRIDE) != 0) {
 446                                         bool is_real_override = false;
 447                                         if (kind == MemberKind.Method && declaringType.BaseType != null) {
 448                                                 var btype = declaringType.BaseType;
 449                                                 if (IsOverrideMethodBaseTypeAccessible (btype)) {
 450                                                         var filter = MemberFilter.Method (name, tparams != null ? tparams.Length : 0, parameters, null);
 451                                                         var candidate = MemberCache.FindMember (btype, filter, BindingRestriction.None);
 452
 453                                                         //
 454                                                         // For imported class method do additional validation to be sure that metadata
 455                                                         // override flag was correct
 456                                                         //
 457                                                         // Difference between protected internal and protected is ok
 458                                                         //
 459                                                         const Modifiers conflict_mask = Modifiers.AccessibilityMask & ~Modifiers.INTERNAL;
 460                                                         if (candidate != null && (candidate.Modifiers & conflict_mask) == (mod & conflict_mask) && !candidate.IsStatic) {
 461                                                                 is_real_override = true;
 462                                                         }
 463                                                 }
 464                                         }
 465
 466                                         if (!is_real_override) {
 467                                                 mod &= ~Modifiers.OVERRIDE;
 468                                                 if ((mod & Modifiers.SEALED) != 0)
 469                                                         mod &= ~Modifiers.SEALED;
 470                                                 else
 471                                                         mod |= Modifiers.VIRTUAL;
 472                                         }
 473                                 } else if (parameters.HasExtensionMethodType) {
 474                                         mod |= Modifiers.METHOD_EXTENSION;
 475                                 }
 476                         }
 477
 478                         IMethodDefinition definition;
 479                         if (tparams != null) {
 480                                 var gmd = new ImportedGenericMethodDefinition ((MethodInfo) mb, returnType, parameters, tparams, this);
 481                                 foreach (var tp in gmd.TypeParameters) {
 482                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
 483                                 }
 484
 485                                 definition = gmd;
 486                         } else {
 487                                 definition = new ImportedMethodDefinition (mb, returnType, parameters, this);
 488                         }
 489
 490                         MethodSpec ms = new MethodSpec (kind, declaringType, definition, returnType, parameters, mod);
 491                         if (tparams != null)
 492                                 ms.IsGeneric = true;
 493
 494                         return ms;
 495                 }
 496
 497                 bool IsOverrideMethodBaseTypeAccessible (TypeSpec baseType)
 498                 {
 499                         switch (baseType.Modifiers & Modifiers.AccessibilityMask) {
 500                         case Modifiers.PUBLIC:
 501                                 return true;
 502                         case Modifiers.INTERNAL:
 503                                 //
 504                                 // Check whether imported method in base type is accessible from compiled
 505                                 // context
 506                                 //
 507                                 return baseType.MemberDefinition.IsInternalAsPublic (module.DeclaringAssembly);
 508                         case Modifiers.PRIVATE:
 509                                 return false;
 510                         default:
 511                                 // protected
 512                                 // protected internal
 513                                 //
 514                                 // Method accessibility checks will be done later based on context
 515                                 // where the method is called (CS0122 error will be reported for inaccessible)
 516                                 //
 517                                 return true;
 518                         }
 519                 }
 520
 521                 //
 522                 // Imports System.Reflection parameters
 523                 //
 524                 AParametersCollection CreateParameters (TypeSpec parent, ParameterInfo[] pi, MethodBase method)
 525                 {
 526                         int varargs = method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0 ? 1 : 0;
 527
 528                         if (pi.Length == 0 && varargs == 0)
 529                                 return ParametersCompiled.EmptyReadOnlyParameters;
 530
 531                         TypeSpec[] types = new TypeSpec[pi.Length + varargs];
 532                         IParameterData[] par = new IParameterData[pi.Length + varargs];
 533                         bool is_params = false;
 534                         for (int i = 0; i < pi.Length; i++) {
 535                                 ParameterInfo p = pi[i];
 536                                 Parameter.Modifier mod = 0;
 537                                 Expression default_value = null;
 538                                 if (p.ParameterType.IsByRef) {
 539                                         if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
 540                                                 mod = Parameter.Modifier.OUT;
 541                                         else
 542                                                 mod = Parameter.Modifier.REF;
 543
 544                                         //
 545                                         // Strip reference wrapping
 546                                         //
 547                                         var el = p.ParameterType.GetElementType ();
 548                                         types[i] = ImportType (el, new DynamicTypeReader (p));  // TODO: 1-based positio to be csc compatible
 549                                 } else if (i == 0 && method.IsStatic && (parent.Modifiers & Modifiers.METHOD_EXTENSION) != 0 &&
 550                                         HasAttribute (CustomAttributeData.GetCustomAttributes (method), "ExtensionAttribute", CompilerServicesNamespace)) {
 551                                         mod = Parameter.Modifier.This;
 552                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 553                                 } else {
 554                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p));
 555
 556                                         if (i >= pi.Length - 2 && types[i] is ArrayContainer) {
 557                                                 if (HasAttribute (CustomAttributeData.GetCustomAttributes (p), "ParamArrayAttribute", "System")) {
 558                                                         mod = Parameter.Modifier.PARAMS;
 559                                                         is_params = true;
 560                                                 }
 561                                         }
 562
 563                                         if (!is_params && p.IsOptional) {
 564                                                 object value = p.RawDefaultValue;
 565                                                 var ptype = types[i];
 566                                                 if ((p.Attributes & ParameterAttributes.HasDefault) != 0 && ptype.Kind != MemberKind.TypeParameter && (value != null || TypeSpec.IsReferenceType (ptype))) {
 567                                                         if (value == null) {
 568                                                                 default_value = Constant.CreateConstantFromValue (ptype, null, Location.Null);
 569                                                         } else {
 570                                                                 default_value = ImportConstant (value);
 571
 572                                                                 if (ptype.IsEnum) {
 573                                                                         default_value = new EnumConstant ((Constant) default_value, ptype);
 574                                                                 }
 575                                                         }
 576
 577                                                         var attrs = CustomAttributeData.GetCustomAttributes (p);
 578                                                         for (int ii = 0; ii < attrs.Count; ++ii) {
 579                                                                 var attr = attrs[ii];
 580                                                                 var dt = attr.Constructor.DeclaringType;
 581                                                                 if (dt.Namespace != CompilerServicesNamespace)
 582                                                                         continue;
 583
 584                                                                 if (dt.Name == "CallerLineNumberAttribute" && (ptype.BuiltinType == BuiltinTypeSpec.Type.Int || Convert.ImplicitNumericConversionExists (module.Compiler.BuiltinTypes.Int, ptype)))
 585                                                                         mod |= Parameter.Modifier.CallerLineNumber;
 586                                                                 else if (dt.Name == "CallerFilePathAttribute" && Convert.ImplicitReferenceConversionExists (module.Compiler.BuiltinTypes.String, ptype))
 587                                                                         mod |= Parameter.Modifier.CallerFilePath;
 588                                                                 else if (dt.Name == "CallerMemberNameAttribute" && Convert.ImplicitReferenceConversionExists (module.Compiler.BuiltinTypes.String, ptype))
 589                                                                         mod |= Parameter.Modifier.CallerMemberName;
 590                                                         }
 591                                                 } else if (value == Missing.Value) {
 592                                                         default_value = EmptyExpression.MissingValue;
 593                                                 } else if (value == null) {
 594                                                         default_value = new DefaultValueExpression (new TypeExpression (ptype, Location.Null), Location.Null);
 595                                                 } else if (ptype.BuiltinType == BuiltinTypeSpec.Type.Decimal) {
 596                                                         default_value = ImportConstant (value);
 597                                                 }
 598                                         }
 599                                 }
 600
 601                                 par[i] = new ParameterData (p.Name, mod, default_value);
 602                         }
 603
 604                         if (varargs != 0) {
 605                                 par[par.Length - 1] = new ArglistParameter (Location.Null);
 606                                 types[types.Length - 1] = InternalType.Arglist;
 607                         }
 608
 609                         return method != null ?
 610                                 new ParametersImported (par, types, varargs != 0, is_params) :
 611                                 new ParametersImported (par, types, is_params);
 612                 }
 613
 614                 //
 615                 // Returns null when the property is not valid C# property
 616                 //
 617                 public PropertySpec CreateProperty (PropertyInfo pi, TypeSpec declaringType, MethodSpec get, MethodSpec set)
 618                 {
 619                         Modifiers mod = 0;
 620                         AParametersCollection param = null;
 621                         TypeSpec type = null;
 622                         if (get != null) {
 623                                 mod = get.Modifiers;
 624                                 param = get.Parameters;
 625                                 type = get.ReturnType;
 626                         }
 627
 628                         bool is_valid_property = true;
 629                         if (set != null) {
 630                                 if (set.ReturnType.Kind != MemberKind.Void)
 631                                         is_valid_property = false;
 632
 633                                 var set_param_count = set.Parameters.Count - 1;
 634
 635                                 if (set_param_count < 0) {
 636                                         set_param_count = 0;
 637                                         is_valid_property = false;
 638                                 }
 639
 640                                 var set_type = set.Parameters.Types[set_param_count];
 641
 642                                 if (mod == 0) {
 643                                         AParametersCollection set_based_param;
 644
 645                                         if (set_param_count == 0) {
 646                                                 set_based_param = ParametersCompiled.EmptyReadOnlyParameters;
 647                                         } else {
 648                                                 //
 649                                                 // Create indexer parameters based on setter method parameters (the last parameter has to be removed)
 650                                                 //
 651                                                 var data = new IParameterData[set_param_count];
 652                                                 var types = new TypeSpec[set_param_count];
 653                                                 Array.Copy (set.Parameters.FixedParameters, data, set_param_count);
 654                                                 Array.Copy (set.Parameters.Types, types, set_param_count);
 655                                                 set_based_param = new ParametersImported (data, types, set.Parameters.HasParams);
 656                                         }
 657
 658                                         mod = set.Modifiers;
 659                                         param = set_based_param;
 660                                         type = set_type;
 661                                 } else {
 662                                         if (set_param_count != get.Parameters.Count)
 663                                                 is_valid_property = false;
 664
 665                                         if (get.ReturnType != set_type)
 666                                                 is_valid_property = false;
 667
 668                                         // Possible custom accessor modifiers
 669                                         if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
 670                                                 var get_acc = mod & Modifiers.AccessibilityMask;
 671                                                 if (get_acc != Modifiers.PUBLIC) {
 672                                                         var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
 673                                                         // If the accessor modifiers are not same, do extra restriction checks
 674                                                         if (get_acc != set_acc) {
 675                                                                 var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
 676                                                                 var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
 677                                                                 if (get_restr && set_restr) {
 678                                                                         is_valid_property = false; // Neither is more restrictive
 679                                                                 }
 680
 681                                                                 if (get_restr) {
 682                                                                         mod &= ~Modifiers.AccessibilityMask;
 683                                                                         mod |= set_acc;
 684                                                                 }
 685                                                         }
 686                                                 }
 687                                         }
 688                                 }
 689                         }
 690
 691                         PropertySpec spec = null;
 692                         if (!param.IsEmpty) {
 693                                 if (is_valid_property) {
 694                                         var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
 695                                         if (index_name == null || index_name != pi.Name) {
 696                                                 is_valid_property = false;
 697                                         } else {
 698                                                 if (get != null) {
 699                                                         if (get.IsStatic)
 700                                                                 is_valid_property = false;
 701                                                 }
 702                                                 if (set != null) {
 703                                                         if (set.IsStatic)
 704                                                                 is_valid_property = false;
 705                                                 }
 706                                         }
 707
 708                                         if (is_valid_property) {
 709                                                 spec = new IndexerSpec (declaringType, new ImportedParameterMemberDefinition (pi, type, param, this), type, param, pi, mod);
 710                                         } else if (declaringType.MemberDefinition.IsComImport && param.FixedParameters[0].HasDefaultValue) {
 711                                                 //
 712                                                 // Enables support for properties with parameters (must have default value) of COM-imported types
 713                                                 //
 714                                                 is_valid_property = true;
 715
 716                                                 for (int i = 0; i < param.FixedParameters.Length; ++i) {
 717                                                         if (!param.FixedParameters[i].HasDefaultValue) {
 718                                                                 is_valid_property = false;
 719                                                                 break;
 720                                                         }
 721                                                 }
 722                                         }
 723                                 }
 724                         }
 725
 726                         if (spec == null)
 727                                 spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi, type, this), type, pi, mod);
 728
 729                         if (!is_valid_property) {
 730                                 spec.IsNotCSharpCompatible = true;
 731                                 return spec;
 732                         }
 733
 734                         if (set != null)
 735                                 spec.Set = set;
 736                         if (get != null)
 737                                 spec.Get = get;
 738
 739                         return spec;
 740                 }
 741
 742                 public TypeSpec CreateType (MetaType type)
 743                 {
 744                         return CreateType (type, new DynamicTypeReader (), true);
 745                 }
 746
 747                 public TypeSpec CreateNestedType (MetaType type, TypeSpec declaringType)
 748                 {
 749                         return CreateType (type, declaringType, new DynamicTypeReader (type), false);
 750                 }
 751
 752                 TypeSpec CreateType (MetaType type, DynamicTypeReader dtype, bool canImportBaseType)
 753                 {
 754                         TypeSpec declaring_type;
 755                         if (type.IsNested && !type.IsGenericParameter)
 756                                 declaring_type = CreateType (type.DeclaringType, new DynamicTypeReader (type.DeclaringType), true);
 757                         else
 758                                 declaring_type = null;
 759
 760                         return CreateType (type, declaring_type, dtype, canImportBaseType);
 761                 }
 762
 763                 protected TypeSpec CreateType (MetaType type, TypeSpec declaringType, DynamicTypeReader dtype, bool canImportBaseType)
 764                 {
 765                         TypeSpec spec;
 766                         if (import_cache.TryGetValue (type, out spec)) {
 767                                 if (spec.BuiltinType == BuiltinTypeSpec.Type.Object) {
 768                                         if (dtype.IsDynamicObject ())
 769                                                 return module.Compiler.BuiltinTypes.Dynamic;
 770
 771                                         return spec;
 772                                 }
 773
 774                                 if (!spec.IsGeneric || type.IsGenericTypeDefinition)
 775                                         return spec;
 776
 777                                 if (!dtype.HasDynamicAttribute ())
 778                                         return spec;
 779
 780                                 // We've found same object in the cache but this one has a dynamic custom attribute
 781                                 // and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
 782                                 // Do type resolve process again in that case
 783
 784                                 // TODO: Handle cases where they still unify
 785                         }
 786
 787                         if (IsMissingType (type)) {
 788                                 spec = new TypeSpec (MemberKind.MissingType, declaringType, new ImportedTypeDefinition (type, this), type, Modifiers.PUBLIC);
 789                                 spec.MemberCache = MemberCache.Empty;
 790                                 import_cache.Add (type, spec);
 791                                 return spec;
 792                         }
 793
 794                         if (type.IsGenericType && !type.IsGenericTypeDefinition) {
 795                                 var type_def = type.GetGenericTypeDefinition ();
 796
 797                                 // Generic type definition can also be forwarded
 798                                 if (compiled_types.TryGetValue (type_def, out spec))
 799                                         return spec;
 800
 801                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 802                                 if (targs == null)
 803                                         return null;
 804                                 if (declaringType == null) {
 805                                         // Simple case, no nesting
 806                                         spec = CreateType (type_def, null, new DynamicTypeReader (), canImportBaseType);
 807                                         spec = spec.MakeGenericType (module, targs);
 808                                 } else {
 809                                         //
 810                                         // Nested type case, converting .NET types like
 811                                         // A`1.B`1.C`1<int, long, string> to typespec like
 812                                         // A<int>.B<long>.C<string>
 813                                         //
 814                                         var nested_hierarchy = new List<TypeSpec> ();
 815                                         while (declaringType.IsNested) {
 816                                                 nested_hierarchy.Add (declaringType);
 817                                                 declaringType = declaringType.DeclaringType;
 818                                         }
 819
 820                                         int targs_pos = 0;
 821                                         if (declaringType.Arity > 0) {
 822                                                 spec = declaringType.MakeGenericType (module, targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
 823                                                 targs_pos = spec.Arity;
 824                                         } else {
 825                                                 spec = declaringType;
 826                                         }
 827
 828                                         for (int i = nested_hierarchy.Count; i != 0; --i) {
 829                                                 var t = nested_hierarchy [i - 1];
 830                                                 if (t.Kind == MemberKind.MissingType)
 831                                                         spec = t;
 832                                                 else
 833                                                         spec = MemberCache.FindNestedType (spec, t.Name, t.Arity, false);
 834
 835                                                 if (t.Arity > 0) {
 836                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
 837                                                         targs_pos += t.Arity;
 838                                                 }
 839                                         }
 840
 841                                         if (spec.Kind == MemberKind.MissingType) {
 842                                                 spec = new TypeSpec (MemberKind.MissingType, spec, new ImportedTypeDefinition (type_def, this), type_def, Modifiers.PUBLIC);
 843                                                 spec.MemberCache = MemberCache.Empty;
 844                                         } else {
 845                                                 if ((type_def.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && IgnorePrivateMembers)
 846                                                         return null;
 847
 848                                                 string name = type.Name;
 849                                                 int index = name.IndexOf ('`');
 850                                                 if (index > 0)
 851                                                         name = name.Substring (0, index);
 852
 853                                                 spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos, false);
 854
 855                                                 if (spec.Arity > 0) {
 856                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).ToArray ());
 857                                                 }
 858                                         }
 859                                 }
 860
 861                                 // Don't add generic type with dynamic arguments, they can interfere with same type
 862                                 // using object type arguments
 863                                 if (!spec.HasDynamicElement) {
 864
 865                                         // Add to reading cache to speed up reading
 866                                         if (!import_cache.ContainsKey (type))
 867                                                 import_cache.Add (type, spec);
 868                                 }
 869
 870                                 return spec;
 871                         }
 872
 873                         Modifiers mod;
 874                         MemberKind kind;
 875
 876                         var ma = type.Attributes;
 877                         switch (ma & TypeAttributes.VisibilityMask) {
 878                         case TypeAttributes.Public:
 879                         case TypeAttributes.NestedPublic:
 880                                 mod = Modifiers.PUBLIC;
 881                                 break;
 882                         case TypeAttributes.NestedPrivate:
 883                                 mod = Modifiers.PRIVATE;
 884                                 break;
 885                         case TypeAttributes.NestedFamily:
 886                                 mod = Modifiers.PROTECTED;
 887                                 break;
 888                         case TypeAttributes.NestedFamORAssem:
 889                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 890                                 break;
 891                         default:
 892                                 mod = Modifiers.INTERNAL;
 893                                 break;
 894                         }
 895
 896                         if ((ma & TypeAttributes.Interface) != 0) {
 897                                 kind = MemberKind.Interface;
 898                         } else if (type.IsGenericParameter) {
 899                                 kind = MemberKind.TypeParameter;
 900                         } else {
 901                                 var base_type = type.BaseType;
 902                                 if (base_type == null || (ma & TypeAttributes.Abstract) != 0) {
 903                                         kind = MemberKind.Class;
 904                                 } else {
 905                                         kind = DetermineKindFromBaseType (base_type);
 906                                         if (kind == MemberKind.Struct || kind == MemberKind.Delegate) {
 907                                                 mod |= Modifiers.SEALED;
 908                                         }
 909                                 }
 910
 911                                 if (kind == MemberKind.Class) {
 912                                         if ((ma & TypeAttributes.Sealed) != 0) {
 913                                                 if ((ma & TypeAttributes.Abstract) != 0)
 914                                                         mod |= Modifiers.STATIC;
 915                                                 else
 916                                                         mod |= Modifiers.SEALED;
 917                                         } else if ((ma & TypeAttributes.Abstract) != 0) {
 918                                                 mod |= Modifiers.ABSTRACT;
 919                                         }
 920                                 }
 921                         }
 922
 923                         var definition = new ImportedTypeDefinition (type, this);
 924                         TypeSpec pt;
 925
 926                         if (kind == MemberKind.Enum) {
 927                                 const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
 928                                         BindingFlags.Instance |
 929                                         BindingFlags.Public | BindingFlags.NonPublic;
 930
 931                                 var type_members = type.GetFields (underlying_member);
 932                                 foreach (var type_member in type_members) {
 933                                         spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
 934                                         break;
 935                                 }
 936
 937                                 if (spec == null)
 938                                         kind = MemberKind.Class;
 939
 940                         } else if (kind == MemberKind.TypeParameter) {
 941                                 spec = CreateTypeParameter (type, declaringType);
 942                         } else if (type.IsGenericTypeDefinition) {
 943                                 definition.TypeParameters = CreateGenericParameters (type, declaringType);
 944                         } else if (compiled_types.TryGetValue (type, out pt)) {
 945                                 //
 946                                 // Same type was found in inside compiled types. It's
 947                                 // either build-in type or forward referenced typed
 948                                 // which point into just compiled assembly.
 949                                 //
 950                                 spec = pt;
 951                                 BuiltinTypeSpec bts = pt as BuiltinTypeSpec;
 952                                 if (bts != null)
 953                                         bts.SetDefinition (definition, type, mod);
 954                         }
 955
 956                         if (spec == null)
 957                                 spec = new TypeSpec (kind, declaringType, definition, type, mod);
 958
 959                         import_cache.Add (type, spec);
 960
 961                         if (kind == MemberKind.TypeParameter) {
 962                                 if (canImportBaseType)
 963                                         ImportTypeParameterTypeConstraints ((TypeParameterSpec) spec, type);
 964
 965                                 return spec;
 966                         }
 967
 968                         //
 969                         // Two stage setup as the base type can be inflated declaring type or
 970                         // another nested type inside same declaring type which has not been
 971                         // loaded, therefore we can import a base type of nested types once
 972                         // the types have been imported
 973                         //
 974                         if (canImportBaseType)
 975                                 ImportTypeBase (spec, type);
 976
 977                         return spec;
 978                 }
 979
 980                 public IAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
 981                 {
 982                         IAssemblyDefinition found;
 983                         if (!assembly_2_definition.TryGetValue (assembly, out found)) {
 984
 985                                 // This can happen in dynamic context only
 986                                 var def = new ImportedAssemblyDefinition (assembly);
 987                                 assembly_2_definition.Add (assembly, def);
 988                                 def.ReadAttributes ();
 989                                 found = def;
 990                         }
 991
 992                         return found;
 993                 }
 994
 995                 public ImportedAssemblyDefinition GetImportedAssemblyDefinition (AssemblyName assemblyName)
 996                 {
 997                         foreach (var a in Assemblies) {
 998                                 var ia = a as ImportedAssemblyDefinition;
 999                                 if (ia == null)
1000                                         continue;
1001
1002                                 if (a.Name == assemblyName.Name)
1003                                         return ia;
1004                         }
1005
1006                         return null;
1007                 }
1008
1009
1010                 public void ImportTypeBase (MetaType type)
1011                 {
1012                         TypeSpec spec = import_cache[type];
1013                         if (spec != null)
1014                                 ImportTypeBase (spec, type);
1015                 }
1016
1017                 TypeParameterSpec CreateTypeParameter (MetaType type, TypeSpec declaringType)
1018                 {
1019                         Variance variance;
1020                         switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
1021                         case GenericParameterAttributes.Covariant:
1022                                 variance = Variance.Covariant;
1023                                 break;
1024                         case GenericParameterAttributes.Contravariant:
1025                                 variance = Variance.Contravariant;
1026                                 break;
1027                         default:
1028                                 variance = Variance.None;
1029                                 break;
1030                         }
1031
1032                         SpecialConstraint special = SpecialConstraint.None;
1033                         var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
1034
1035                         if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
1036                                 special |= SpecialConstraint.Struct;
1037                         } else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
1038                                 special = SpecialConstraint.Constructor;
1039                         }
1040
1041                         if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
1042                                 special |= SpecialConstraint.Class;
1043                         }
1044
1045                         TypeParameterSpec spec;
1046                         var def = new ImportedTypeParameterDefinition (type, this);
1047                         if (type.DeclaringMethod != null) {
1048                                 spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
1049                         } else {
1050                                 spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
1051                         }
1052
1053                         return spec;
1054                 }
1055
1056                 //
1057                 // Test for a custom attribute type match. Custom attributes are not really predefined globaly
1058                 // they can be assembly specific therefore we do check based on names only
1059                 //
1060                 public static bool HasAttribute (IList<CustomAttributeData> attributesData, string attrName, string attrNamespace)
1061                 {
1062                         if (attributesData.Count == 0)
1063                                 return false;
1064
1065                         foreach (var attr in attributesData) {
1066                                 var dt = attr.Constructor.DeclaringType;
1067                                 if (dt.Name == attrName && dt.Namespace == attrNamespace)
1068                                         return true;
1069                         }
1070
1071                         return false;
1072                 }
1073
1074                 void ImportTypeBase (TypeSpec spec, MetaType type)
1075                 {
1076                         if (spec.Kind == MemberKind.Interface)
1077                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1078                         else if (type.BaseType != null) {
1079                                 TypeSpec base_type;
1080                                 if (!IsMissingType (type.BaseType) && type.BaseType.IsGenericType)
1081                                         base_type = CreateType (type.BaseType, new DynamicTypeReader (type), true);
1082                                 else
1083                                         base_type = CreateType (type.BaseType);
1084
1085                                 spec.BaseType = base_type;
1086                         }
1087
1088                         if (spec.MemberDefinition.TypeParametersCount > 0) {
1089                                 foreach (var tp in spec.MemberDefinition.TypeParameters) {
1090                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
1091                                 }
1092                         }
1093                 }
1094
1095                 protected void ImportTypes (MetaType[] types, Namespace targetNamespace, bool importExtensionTypes)
1096                 {
1097                         Namespace ns = targetNamespace;
1098                         string prev_namespace = null;
1099                         foreach (var t in types) {
1100                                 if (t == null)
1101                                         continue;
1102
1103                                 // Be careful not to trigger full parent type loading
1104                                 if (t.MemberType == MemberTypes.NestedType)
1105                                         continue;
1106
1107                                 if (t.Name[0] == '<')
1108                                         continue;
1109
1110                                 var it = CreateType (t, null, new DynamicTypeReader (t), true);
1111                                 if (it == null)
1112                                         continue;
1113
1114                                 if (prev_namespace != t.Namespace) {
1115                                         ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
1116                                         prev_namespace = t.Namespace;
1117                                 }
1118
1119                                 // Cannot rely on assembly level Extension attribute or static modifier because they
1120                                 // are not followed by other compilers (e.g. F#).
1121                                 if (it.IsClass && it.Arity == 0 && importExtensionTypes &&
1122                                         HasAttribute (CustomAttributeData.GetCustomAttributes (t), "ExtensionAttribute", CompilerServicesNamespace)) {
1123                                         it.SetExtensionMethodContainer ();
1124                                 }
1125
1126                                 ns.AddType (module, it);
1127                         }
1128                 }
1129
1130                 void ImportTypeParameterTypeConstraints (TypeParameterSpec spec, MetaType type)
1131                 {
1132                         var constraints = type.GetGenericParameterConstraints ();
1133                         List<TypeSpec> tparams = null;
1134                         foreach (var ct in constraints) {
1135                                 if (ct.IsGenericParameter) {
1136                                         if (tparams == null)
1137                                                 tparams = new List<TypeSpec> ();
1138
1139                                         tparams.Add (CreateType (ct));
1140                                         continue;
1141                                 }
1142
1143                                 var constraint_type = CreateType (ct);
1144                                 if (constraint_type.IsClass) {
1145                                         spec.BaseType = constraint_type;
1146                                         continue;
1147                                 }
1148
1149                                 spec.AddInterface (constraint_type);
1150                         }
1151
1152                         if (spec.BaseType == null)
1153                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1154
1155                         if (tparams != null)
1156                                 spec.TypeArguments = tparams.ToArray ();
1157                 }
1158
1159                 Constant ImportConstant (object value)
1160                 {
1161                         //
1162                         // Get type of underlying value as int constant can be used for object
1163                         // parameter type. This is not allowed in C# but other languages can do that
1164                         //
1165                         var types = module.Compiler.BuiltinTypes;
1166                         switch (System.Type.GetTypeCode (value.GetType ())) {
1167                         case TypeCode.Boolean:
1168                                 return new BoolConstant (types, (bool) value, Location.Null);
1169                         case TypeCode.Byte:
1170                                 return new ByteConstant (types, (byte) value, Location.Null);
1171                         case TypeCode.Char:
1172                                 return new CharConstant (types, (char) value, Location.Null);
1173                         case TypeCode.Decimal:
1174                                 return new DecimalConstant (types, (decimal) value, Location.Null);
1175                         case TypeCode.Double:
1176                                 return new DoubleConstant (types, (double) value, Location.Null);
1177                         case TypeCode.Int16:
1178                                 return new ShortConstant (types, (short) value, Location.Null);
1179                         case TypeCode.Int32:
1180                                 return new IntConstant (types, (int) value, Location.Null);
1181                         case TypeCode.Int64:
1182                                 return new LongConstant (types, (long) value, Location.Null);
1183                         case TypeCode.SByte:
1184                                 return new SByteConstant (types, (sbyte) value, Location.Null);
1185                         case TypeCode.Single:
1186                                 return new FloatConstant (types, (float) value, Location.Null);
1187                         case TypeCode.String:
1188                                 return new StringConstant (types, (string) value, Location.Null);
1189                         case TypeCode.UInt16:
1190                                 return new UShortConstant (types, (ushort) value, Location.Null);
1191                         case TypeCode.UInt32:
1192                                 return new UIntConstant (types, (uint) value, Location.Null);
1193                         case TypeCode.UInt64:
1194                                 return new ULongConstant (types, (ulong) value, Location.Null);
1195                         }
1196
1197                         throw new NotImplementedException (value.GetType ().ToString ());
1198                 }
1199
1200                 public TypeSpec ImportType (MetaType type)
1201                 {
1202                         return ImportType (type, new DynamicTypeReader (type));
1203                 }
1204
1205                 TypeSpec ImportType (MetaType type, DynamicTypeReader dtype)
1206                 {
1207                         if (type.HasElementType) {
1208                                 var element = type.GetElementType ();
1209                                 ++dtype.Position;
1210                                 var spec = ImportType (element, dtype);
1211
1212                                 if (type.IsArray)
1213                                         return ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
1214                                 if (type.IsByRef)
1215                                         return ReferenceContainer.MakeType (module, spec);
1216                                 if (type.IsPointer)
1217                                         return PointerContainer.MakeType (module, spec);
1218
1219                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
1220                         }
1221
1222                         TypeSpec compiled_type;
1223                         if (compiled_types.TryGetValue (type, out compiled_type)) {
1224                                 if (compiled_type.BuiltinType == BuiltinTypeSpec.Type.Object && dtype.IsDynamicObject ())
1225                                         return module.Compiler.BuiltinTypes.Dynamic;
1226
1227                                 return compiled_type;
1228                         }
1229
1230                         return CreateType (type, dtype, true);
1231                 }
1232
1233                 static bool IsMissingType (MetaType type)
1234                 {
1235 #if STATIC
1236                         return type.__IsMissing;
1237 #else
1238                         return false;
1239 #endif
1240                 }
1241
1242                 //
1243                 // Decimal constants cannot be encoded in the constant blob, and thus are marked
1244                 // as IsInitOnly ('readonly' in C# parlance).  We get its value from the
1245                 // DecimalConstantAttribute metadata.
1246                 //
1247                 Constant ReadDecimalConstant (IList<CustomAttributeData> attrs)
1248                 {
1249                         if (attrs.Count == 0)
1250                                 return null;
1251
1252                         foreach (var ca in attrs) {
1253                                 var dt = ca.Constructor.DeclaringType;
1254                                 if (dt.Name != "DecimalConstantAttribute" || dt.Namespace != CompilerServicesNamespace)
1255                                         continue;
1256
1257                                 var value = new decimal (
1258                                         (int) (uint) ca.ConstructorArguments[4].Value,
1259                                         (int) (uint) ca.ConstructorArguments[3].Value,
1260                                         (int) (uint) ca.ConstructorArguments[2].Value,
1261                                         (byte) ca.ConstructorArguments[1].Value != 0,
1262                                         (byte) ca.ConstructorArguments[0].Value);
1263
1264                                 return new DecimalConstant (module.Compiler.BuiltinTypes, value, Location.Null);
1265                         }
1266
1267                         return null;
1268                 }
1269
1270                 static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
1271                 {
1272                         Modifiers mod;
1273                         var ma = mb.Attributes;
1274                         switch (ma & MethodAttributes.MemberAccessMask) {
1275                         case MethodAttributes.Public:
1276                                 mod = Modifiers.PUBLIC;
1277                                 break;
1278                         case MethodAttributes.Assembly:
1279                                 mod = Modifiers.INTERNAL;
1280                                 break;
1281                         case MethodAttributes.Family:
1282                                 mod = Modifiers.PROTECTED;
1283                                 break;
1284                         case MethodAttributes.FamORAssem:
1285                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
1286                                 break;
1287                         default:
1288                                 mod = Modifiers.PRIVATE;
1289                                 break;
1290                         }
1291
1292                         if ((ma & MethodAttributes.Static) != 0) {
1293                                 mod |= Modifiers.STATIC;
1294                                 return mod;
1295                         }
1296                         if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
1297                                 mod |= Modifiers.ABSTRACT;
1298                                 return mod;
1299                         }
1300
1301                         // It can be sealed and override
1302                         if ((ma & MethodAttributes.Final) != 0)
1303                                 mod |= Modifiers.SEALED;
1304
1305                         if ((ma & MethodAttributes.Virtual) != 0) {
1306                                 // Not every member can be detected based on MethodAttribute, we
1307                                 // set virtual or non-virtual only when we are certain. Further checks
1308                                 // to really find out what `virtual' means for this member are done
1309                                 // later
1310                                 if ((ma & MethodAttributes.NewSlot) != 0) {
1311                                         if ((mod & Modifiers.SEALED) != 0) {
1312                                                 mod &= ~Modifiers.SEALED;
1313                                         } else {
1314                                                 mod |= Modifiers.VIRTUAL;
1315                                         }
1316                                 } else {
1317                                         mod |= Modifiers.OVERRIDE;
1318                                 }
1319                         }
1320
1321                         return mod;
1322                 }
1323         }
1324
1325         abstract class ImportedDefinition : IMemberDefinition
1326         {
1327                 protected class AttributesBag
1328                 {
1329                         public static readonly AttributesBag Default = new AttributesBag ();
1330
1331                         public AttributeUsageAttribute AttributeUsage;
1332                         public ObsoleteAttribute Obsolete;
1333                         public string[] Conditionals;
1334                         public string DefaultIndexerName;
1335                         public bool? CLSAttributeValue;
1336                         public TypeSpec CoClass;
1337
1338                         static bool HasMissingType (ConstructorInfo ctor)
1339                         {
1340 #if STATIC
1341                                 //
1342                                 // Mimic odd csc behaviour where missing type on predefined
1343                                 // attributes means the attribute is silently ignored. This can
1344                                 // happen with PCL facades
1345                                 //
1346                                 foreach (var p in ctor.GetParameters ()) {
1347                                         if (p.ParameterType.__ContainsMissingType)
1348                                                 return true;
1349                                 }
1350 #endif
1351
1352                                 return false;
1353                         }
1354
1355                         public static AttributesBag Read (MemberInfo mi, MetadataImporter importer)
1356                         {
1357                                 AttributesBag bag = null;
1358                                 List<string> conditionals = null;
1359
1360                                 // It should not throw any loading exception
1361                                 IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
1362
1363                                 foreach (var a in attrs) {
1364                                         var dt = a.Constructor.DeclaringType;
1365                                         string name = dt.Name;
1366                                         if (name == "ObsoleteAttribute") {
1367                                                 if (dt.Namespace != "System")
1368                                                         continue;
1369
1370                                                 if (bag == null)
1371                                                         bag = new AttributesBag ();
1372
1373                                                 var args = a.ConstructorArguments;
1374
1375                                                 if (args.Count == 1) {
1376                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
1377                                                 } else if (args.Count == 2) {
1378                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
1379                                                 } else {
1380                                                         bag.Obsolete = new ObsoleteAttribute ();
1381                                                 }
1382
1383                                                 continue;
1384                                         }
1385
1386                                         if (name == "ConditionalAttribute") {
1387                                                 if (dt.Namespace != "System.Diagnostics")
1388                                                         continue;
1389
1390                                                 if (bag == null)
1391                                                         bag = new AttributesBag ();
1392
1393                                                 if (conditionals == null)
1394                                                         conditionals = new List<string> (2);
1395
1396                                                 conditionals.Add ((string) a.ConstructorArguments[0].Value);
1397                                                 continue;
1398                                         }
1399
1400                                         if (name == "CLSCompliantAttribute") {
1401                                                 if (dt.Namespace != "System")
1402                                                         continue;
1403
1404                                                 if (bag == null)
1405                                                         bag = new AttributesBag ();
1406
1407                                                 bag.CLSAttributeValue = (bool) a.ConstructorArguments[0].Value;
1408                                                 continue;
1409                                         }
1410
1411                                         // Type only attributes
1412                                         if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
1413                                                 if (name == "DefaultMemberAttribute") {
1414                                                         if (dt.Namespace != "System.Reflection")
1415                                                                 continue;
1416
1417                                                         if (bag == null)
1418                                                                 bag = new AttributesBag ();
1419
1420                                                         bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
1421                                                         continue;
1422                                                 }
1423
1424                                                 if (name == "AttributeUsageAttribute") {
1425                                                         if (dt.Namespace != "System")
1426                                                                 continue;
1427
1428                                                         if (HasMissingType (a.Constructor))
1429                                                                 continue;
1430
1431                                                         if (bag == null)
1432                                                                 bag = new AttributesBag ();
1433
1434                                                         bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
1435                                                         foreach (var named in a.NamedArguments) {
1436                                                                 if (named.MemberInfo.Name == "AllowMultiple")
1437                                                                         bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
1438                                                                 else if (named.MemberInfo.Name == "Inherited")
1439                                                                         bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
1440                                                         }
1441                                                         continue;
1442                                                 }
1443
1444                                                 // Interface only attribute
1445                                                 if (name == "CoClassAttribute") {
1446                                                         if (dt.Namespace != "System.Runtime.InteropServices")
1447                                                                 continue;
1448
1449                                                         if (HasMissingType (a.Constructor))
1450                                                                 continue;
1451
1452                                                         if (bag == null)
1453                                                                 bag = new AttributesBag ();
1454
1455                                                         bag.CoClass = importer.ImportType ((MetaType) a.ConstructorArguments[0].Value);
1456                                                         continue;
1457                                                 }
1458                                         }
1459                                 }
1460
1461                                 if (bag == null)
1462                                         return Default;
1463
1464                                 if (conditionals != null)
1465                                         bag.Conditionals = conditionals.ToArray ();
1466
1467                                 return bag;
1468                         }
1469                 }
1470
1471                 protected readonly MemberInfo provider;
1472                 protected AttributesBag cattrs;
1473                 protected readonly MetadataImporter importer;
1474
1475                 protected ImportedDefinition (MemberInfo provider, MetadataImporter importer)
1476                 {
1477                         this.provider = provider;
1478                         this.importer = importer;
1479                 }
1480
1481                 #region Properties
1482
1483                 public bool IsImported {
1484                         get {
1485                                 return true;
1486                         }
1487                 }
1488
1489                 public virtual string Name {
1490                         get {
1491                                 return provider.Name;
1492                         }
1493                 }
1494
1495                 #endregion
1496
1497                 public string[] ConditionalConditions ()
1498                 {
1499                         if (cattrs == null)
1500                                 ReadAttributes ();
1501
1502                         return cattrs.Conditionals;
1503                 }
1504
1505                 public ObsoleteAttribute GetAttributeObsolete ()
1506                 {
1507                         if (cattrs == null)
1508                                 ReadAttributes ();
1509
1510                         return cattrs.Obsolete;
1511                 }
1512
1513                 public bool? CLSAttributeValue {
1514                         get {
1515                                 if (cattrs == null)
1516                                         ReadAttributes ();
1517
1518                                 return cattrs.CLSAttributeValue;
1519                         }
1520                 }
1521
1522                 protected void ReadAttributes ()
1523                 {
1524                         cattrs = AttributesBag.Read (provider, importer);
1525                 }
1526
1527                 public void SetIsAssigned ()
1528                 {
1529                         // Unused for imported members
1530                 }
1531
1532                 public void SetIsUsed ()
1533                 {
1534                         // Unused for imported members
1535                 }
1536         }
1537
1538         public class ImportedModuleDefinition
1539         {
1540                 readonly Module module;
1541                 bool cls_compliant;
1542
1543                 public ImportedModuleDefinition (Module module)
1544                 {
1545                         this.module = module;
1546                 }
1547
1548                 #region Properties
1549
1550                 public bool IsCLSCompliant {
1551                         get {
1552                                 return cls_compliant;
1553                         }
1554                 }
1555
1556                 public string Name {
1557                         get {
1558                                 return module.Name;
1559                         }
1560                 }
1561
1562                 #endregion
1563
1564                 public void ReadAttributes ()
1565                 {
1566                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
1567
1568                         foreach (var a in attrs) {
1569                                 var dt = a.Constructor.DeclaringType;
1570                                 if (dt.Name == "CLSCompliantAttribute") {
1571                                         if (dt.Namespace != "System")
1572                                                 continue;
1573
1574                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1575                                         continue;
1576                                 }
1577                         }
1578                 }
1579
1580                 //
1581                 // Reads assembly attributes which where attached to a special type because
1582                 // module does have assembly manifest
1583                 //
1584                 public List<Attribute> ReadAssemblyAttributes ()
1585                 {
1586                         var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
1587                         if (t == null)
1588                                 return null;
1589
1590                         var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
1591                         if (field == null)
1592                                 return null;
1593
1594                         // TODO: implement, the idea is to fabricate specil Attribute class and
1595                         // add it to OptAttributes before resolving the source code attributes
1596                         // Need to build module location as well for correct error reporting
1597
1598                         //var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
1599                         //var attrs = new List<Attribute> (assembly_attributes.Count);
1600                         //foreach (var a in assembly_attributes)
1601                         //{
1602                         //    var type = metaImporter.ImportType (a.Constructor.DeclaringType);
1603                         //    var ctor = metaImporter.CreateMethod (a.Constructor, type);
1604
1605                         //    foreach (var carg in a.ConstructorArguments) {
1606                         //        carg.Value
1607                         //    }
1608
1609                         //    attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
1610                         //}
1611
1612                         return null;
1613                 }
1614         }
1615
1616         public class ImportedAssemblyDefinition : IAssemblyDefinition
1617         {
1618                 readonly Assembly assembly;
1619                 readonly AssemblyName aname;
1620                 bool cls_compliant;
1621
1622                 List<AssemblyName> internals_visible_to;
1623                 Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
1624
1625                 public ImportedAssemblyDefinition (Assembly assembly)
1626                 {
1627                         this.assembly = assembly;
1628                         this.aname = assembly.GetName ();
1629                 }
1630
1631                 #region Properties
1632
1633                 public Assembly Assembly {
1634                         get {
1635                                 return assembly;
1636                         }
1637                 }
1638
1639                 public string FullName {
1640                         get {
1641                                 return aname.FullName;
1642                         }
1643                 }
1644
1645                 public bool HasStrongName {
1646                         get {
1647                                 return aname.GetPublicKey ().Length != 0;
1648                         }
1649                 }
1650
1651                 public bool IsMissing {
1652                         get {
1653 #if STATIC
1654                                 return assembly.__IsMissing;
1655 #else
1656                                 return false;
1657 #endif
1658                         }
1659                 }
1660
1661                 public bool IsCLSCompliant {
1662                         get {
1663                                 return cls_compliant;
1664                         }
1665                 }
1666
1667                 public string Location {
1668                         get {
1669                                 return assembly.Location;
1670                         }
1671                 }
1672
1673                 public string Name {
1674                         get {
1675                                 return aname.Name;
1676                         }
1677                 }
1678
1679                 #endregion
1680
1681                 public byte[] GetPublicKeyToken ()
1682                 {
1683                         return aname.GetPublicKeyToken ();
1684                 }
1685
1686                 public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
1687                 {
1688                         return internals_visible_to_cache [assembly];
1689                 }
1690
1691                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1692                 {
1693                         if (internals_visible_to == null)
1694                                 return false;
1695
1696                         AssemblyName is_visible = null;
1697                         if (internals_visible_to_cache == null) {
1698                                 internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
1699                         } else {
1700                                 if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
1701                                         return is_visible != null;
1702                         }
1703
1704                         var token = assembly.GetPublicKeyToken ();
1705                         if (token != null && token.Length == 0)
1706                                 token = null;
1707
1708                         foreach (var internals in internals_visible_to) {
1709                                 if (internals.Name != assembly.Name)
1710                                         continue;
1711
1712                                 if (token == null && assembly is AssemblyDefinition) {
1713                                         is_visible = internals;
1714                                         break;
1715                                 }
1716
1717                                 if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
1718                                         continue;
1719
1720                                 is_visible = internals;
1721                                 break;
1722                         }
1723
1724                         internals_visible_to_cache.Add (assembly, is_visible);
1725                         return is_visible != null;
1726                 }
1727
1728                 public void ReadAttributes ()
1729                 {
1730 #if STATIC
1731                         if (assembly.__IsMissing)
1732                                 return;
1733 #endif
1734
1735                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
1736
1737                         foreach (var a in attrs) {
1738                                 var dt = a.Constructor.DeclaringType;
1739                                 var name = dt.Name;
1740                                 if (name == "CLSCompliantAttribute") {
1741                                         if (dt.Namespace == "System") {
1742                                                 cls_compliant = (bool) a.ConstructorArguments[0].Value;
1743                                         }
1744                                         continue;
1745                                 }
1746
1747                                 if (name == "InternalsVisibleToAttribute") {
1748                                         if (dt.Namespace != MetadataImporter.CompilerServicesNamespace)
1749                                                 continue;
1750
1751                                         string s = a.ConstructorArguments[0].Value as string;
1752                                         if (s == null)
1753                                                 continue;
1754
1755                                         AssemblyName an;
1756                                         try {
1757                                                 an = new AssemblyName (s);
1758                                         } catch (FileLoadException) {
1759                                                 // Invalid assembly name reuses FileLoadException
1760                                                 continue;
1761                                         }
1762
1763                                         if (internals_visible_to == null)
1764                                                 internals_visible_to = new List<AssemblyName> ();
1765
1766                                         internals_visible_to.Add (an);
1767                                         continue;
1768                                 }
1769                         }
1770                 }
1771
1772                 public override string ToString ()
1773                 {
1774                         return FullName;
1775                 }
1776         }
1777
1778         class ImportedMemberDefinition : ImportedDefinition
1779         {
1780                 readonly TypeSpec type;
1781
1782                 public ImportedMemberDefinition (MemberInfo member, TypeSpec type, MetadataImporter importer)
1783                         : base (member, importer)
1784                 {
1785                         this.type = type;
1786                 }
1787
1788                 #region Properties
1789
1790                 public TypeSpec MemberType {
1791                         get {
1792                                 return type;
1793                         }
1794                 }
1795
1796                 #endregion
1797         }
1798
1799         class ImportedParameterMemberDefinition : ImportedMemberDefinition, IParametersMember
1800         {
1801                 readonly AParametersCollection parameters;
1802
1803                 protected ImportedParameterMemberDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1804                         : base (provider, type, importer)
1805                 {
1806                         this.parameters = parameters;
1807                 }
1808
1809                 public ImportedParameterMemberDefinition (PropertyInfo provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1810                         : base (provider, type, importer)
1811                 {
1812                         this.parameters = parameters;
1813                 }
1814
1815                 #region Properties
1816
1817                 public AParametersCollection Parameters {
1818                         get {
1819                                 return parameters;
1820                         }
1821                 }
1822
1823                 #endregion
1824         }
1825
1826         class ImportedMethodDefinition : ImportedParameterMemberDefinition, IMethodDefinition
1827         {
1828                 public ImportedMethodDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1829                         : base (provider, type, parameters, importer)
1830                 {
1831                 }
1832
1833                 MethodBase IMethodDefinition.Metadata {
1834                         get {
1835                                 return (MethodBase) provider;
1836                         }
1837                 }
1838         }
1839
1840         class ImportedGenericMethodDefinition : ImportedMethodDefinition, IGenericMethodDefinition
1841         {
1842                 readonly TypeParameterSpec[] tparams;
1843
1844                 public ImportedGenericMethodDefinition (MethodInfo provider, TypeSpec type, AParametersCollection parameters, TypeParameterSpec[] tparams, MetadataImporter importer)
1845                         : base (provider, type, parameters, importer)
1846                 {
1847                         this.tparams = tparams;
1848                 }
1849
1850                 #region Properties
1851
1852                 public TypeParameterSpec[] TypeParameters {
1853                         get {
1854                                 return tparams;
1855                         }
1856                 }
1857
1858                 public int TypeParametersCount {
1859                         get {
1860                                 return tparams.Length;
1861                         }
1862                 }
1863
1864                 #endregion
1865         }
1866
1867         class ImportedTypeDefinition : ImportedDefinition, ITypeDefinition
1868         {
1869                 TypeParameterSpec[] tparams;
1870                 string name;
1871
1872                 public ImportedTypeDefinition (MetaType type, MetadataImporter importer)
1873                         : base (type, importer)
1874                 {
1875                 }
1876
1877                 #region Properties
1878
1879                 public IAssemblyDefinition DeclaringAssembly {
1880                         get {
1881                                 return importer.GetAssemblyDefinition (provider.Module.Assembly);
1882                         }
1883                 }
1884
1885                 bool ITypeDefinition.IsComImport {
1886                         get {
1887                                 return ((MetaType) provider).IsImport;
1888                         }
1889                 }
1890
1891
1892                 bool ITypeDefinition.IsPartial {
1893                         get {
1894                                 return false;
1895                         }
1896                 }
1897
1898                 bool ITypeDefinition.IsTypeForwarder {
1899                         get {
1900 #if STATIC
1901                                 return ((MetaType) provider).__IsTypeForwarder;
1902 #else
1903                                 return false;
1904 #endif
1905                         }
1906                 }
1907
1908                 bool ITypeDefinition.IsCyclicTypeForwarder {
1909                         get {
1910 #if STATIC
1911                                 return ((MetaType) provider).__IsCyclicTypeForwarder;
1912 #else
1913                                 return false;
1914 #endif
1915                         }
1916                 }
1917
1918                 public override string Name {
1919                         get {
1920                                 if (name == null) {
1921                                         name = base.Name;
1922                                         if (tparams != null) {
1923                                                 int arity_start = name.IndexOf ('`');
1924                                                 if (arity_start > 0)
1925                                                         name = name.Substring (0, arity_start);
1926                                         }
1927                                 }
1928
1929                                 return name;
1930                         }
1931                 }
1932
1933                 public string Namespace {
1934                         get {
1935                                 return ((MetaType) provider).Namespace;
1936                         }
1937                 }
1938
1939                 public int TypeParametersCount {
1940                         get {
1941                                 return tparams == null ? 0 : tparams.Length;
1942                         }
1943                 }
1944
1945                 public TypeParameterSpec[] TypeParameters {
1946                         get {
1947                                 return tparams;
1948                         }
1949                         set {
1950                                 tparams = value;
1951                         }
1952                 }
1953
1954                 #endregion
1955
1956                 public void DefineInterfaces (TypeSpec spec)
1957                 {
1958                         var type = (MetaType) provider;
1959                         MetaType[] ifaces;
1960 #if STATIC
1961                         ifaces = type.__GetDeclaredInterfaces ();
1962                         if (ifaces.Length != 0) {
1963                                 foreach (var iface in ifaces) {
1964                                         var it = importer.CreateType (iface);
1965                                         if (it == null)
1966                                                 continue;
1967
1968                                         spec.AddInterfaceDefined (it);
1969
1970                                         // Unfortunately not all languages expand inherited interfaces
1971                                         var bifaces = it.Interfaces;
1972                                         if (bifaces != null) {
1973                                                 foreach (var biface in bifaces) {
1974                                                         spec.AddInterfaceDefined (biface);
1975                                                 }
1976                                         }
1977                                 }
1978                         }
1979
1980                         //
1981                         // It's impossible to get declared interfaces only using System.Reflection
1982                         // hence we need to mimic the behavior with ikvm-reflection too to keep
1983                         // our type look-up logic same
1984                         //
1985                         if (spec.BaseType != null) {
1986                                 var bifaces = spec.BaseType.Interfaces;
1987                                 if (bifaces != null) {
1988                                         //
1989                                         // Before adding base class interfaces close defined interfaces
1990                                         // on type parameter
1991                                         //
1992                                         var tp = spec as TypeParameterSpec;
1993                                         if (tp != null && tp.InterfacesDefined == null) {
1994                                                 tp.InterfacesDefined = TypeSpec.EmptyTypes;
1995                                         }
1996
1997                                         foreach (var iface in bifaces)
1998                                                 spec.AddInterfaceDefined (iface);
1999                                 }
2000                         }
2001 #else
2002                         ifaces = type.GetInterfaces ();
2003
2004                         if (ifaces.Length > 0) {
2005                                 foreach (var iface in ifaces) {
2006                                         spec.AddInterface (importer.CreateType (iface));
2007                                 }
2008                         }
2009 #endif
2010
2011                 }
2012
2013                 public static void Error_MissingDependency (IMemberContext ctx, List<MissingTypeSpecReference> missing, Location loc)
2014                 {
2015                         //
2016                         // Report details about missing type and most likely cause of the problem.
2017                         // csc used to reports 1683, 1684 (now 7069) as warnings but we report them only when used
2018                         // or referenced from the user core in which case compilation error has to
2019                         // be reported because compiler cannot continue anyway
2020                         //
2021
2022                         var report = ctx.Module.Compiler.Report;
2023
2024                         for (int i = 0; i < missing.Count; ++i) {
2025                                 var t = missing [i].Type;
2026
2027                                 //
2028                                 // Report missing types only once
2029                                 //
2030                                 if (report.Printer.MissingTypeReported (t.MemberDefinition))
2031                                         continue;
2032
2033                                 string name = t.GetSignatureForError ();
2034
2035                                 var caller = missing[i].Caller;
2036                                 if (caller.Kind != MemberKind.MissingType)
2037                                         report.SymbolRelatedToPreviousError (caller);
2038
2039                                 var definition = t.MemberDefinition;
2040                                 if (definition.DeclaringAssembly == ctx.Module.DeclaringAssembly) {
2041                                         report.Error (1683, loc,
2042                                                 "Reference to type `{0}' claims it is defined in this assembly, but it is not defined in source or any added modules",
2043                                                 name);
2044                                 } else if (definition.DeclaringAssembly.IsMissing) {
2045                                         if (definition.IsTypeForwarder) {
2046                                                 report.Error (1070, loc,
2047                                                         "The type `{0}' has been forwarded to an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
2048                                                         name, definition.DeclaringAssembly.FullName);
2049                                         } else {
2050                                                 report.Error (12, loc,
2051                                                         "The type `{0}' is defined in an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
2052                                                         name, definition.DeclaringAssembly.FullName);
2053                                         }
2054                                 } else if (definition.IsTypeForwarder) {
2055                                         report.Error (731, loc, "The type forwarder for type `{0}' in assembly `{1}' has circular dependency",
2056                                                 name, definition.DeclaringAssembly.FullName);
2057                                 } else {
2058                                         report.Error (7069, loc,
2059                                                 "Reference to type `{0}' claims it is defined assembly `{1}', but it could not be found",
2060                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
2061                                 }
2062                         }
2063                 }
2064
2065                 public TypeSpec GetAttributeCoClass ()
2066                 {
2067                         if (cattrs == null)
2068                                 ReadAttributes ();
2069
2070                         return cattrs.CoClass;
2071                 }
2072
2073                 public string GetAttributeDefaultMember ()
2074                 {
2075                         if (cattrs == null)
2076                                 ReadAttributes ();
2077
2078                         return cattrs.DefaultIndexerName;
2079                 }
2080
2081                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2082                 {
2083                         if (cattrs == null)
2084                                 ReadAttributes ();
2085
2086                         return cattrs.AttributeUsage;
2087                 }
2088
2089                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2090                 {
2091                         var a = importer.GetAssemblyDefinition (provider.Module.Assembly);
2092                         return a == assembly || a.IsFriendAssemblyTo (assembly);
2093                 }
2094
2095                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2096                 {
2097                         //
2098                         // Not interested in members of nested private types unless the importer needs them
2099                         //
2100                         if (declaringType.IsPrivate && importer.IgnorePrivateMembers) {
2101                                 cache = MemberCache.Empty;
2102                                 return;
2103                         }
2104
2105                         var loading_type = (MetaType) provider;
2106                         const BindingFlags all_members = BindingFlags.DeclaredOnly |
2107                                 BindingFlags.Static | BindingFlags.Instance |
2108                                 BindingFlags.Public | BindingFlags.NonPublic;
2109
2110                         const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
2111                                         MethodAttributes.Virtual | MethodAttributes.HideBySig |
2112                                         MethodAttributes.Final;
2113
2114                         Dictionary<MethodBase, MethodSpec> possible_accessors = null;
2115                         List<EventSpec> imported_events = null;
2116                         EventSpec event_spec;
2117                         MemberSpec imported;
2118                         MethodInfo m;
2119                         MemberInfo[] all;
2120                         try {
2121                                 all = loading_type.GetMembers (all_members);
2122                         } catch (Exception e) {
2123                                 throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
2124                                         declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
2125                         }
2126
2127                         if (cache == null) {
2128                                 cache = new MemberCache (all.Length);
2129
2130                                 //
2131                                 // Do the types first as they can be referenced by the members before
2132                                 // they are found or inflated
2133                                 //
2134                                 foreach (var member in all) {
2135                                         if (member.MemberType != MemberTypes.NestedType)
2136                                                 continue;
2137
2138                                         var t = (MetaType) member;
2139
2140                                         // Ignore compiler generated types, mostly lambda containers
2141                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2142                                                 continue;
2143
2144                                         try {
2145                                                 imported = importer.CreateNestedType (t, declaringType);
2146                                         } catch (Exception e) {
2147                                                 throw new InternalErrorException (e, "Could not import nested type `{0}' from `{1}'",
2148                                                         t.FullName, declaringType.MemberDefinition.DeclaringAssembly.FullName);
2149                                         }
2150
2151                                         cache.AddMemberImported (imported);
2152                                 }
2153
2154                                 foreach (var member in all) {
2155                                         if (member.MemberType != MemberTypes.NestedType)
2156                                                 continue;
2157
2158                                         var t = (MetaType) member;
2159
2160                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2161                                                 continue;
2162
2163                                         importer.ImportTypeBase (t);
2164                                 }
2165                         }
2166
2167                         //
2168                         // Load base interfaces first to minic behaviour of compiled members
2169                         //
2170                         if (declaringType.IsInterface && declaringType.Interfaces != null) {
2171                                 foreach (var iface in declaringType.Interfaces) {
2172                                         cache.AddInterface (iface);
2173                                 }
2174                         }
2175
2176                         if (!onlyTypes) {
2177                                 //
2178                                 // The logic here requires methods to be returned first which seems to work for both Mono and .NET
2179                                 //
2180                                 foreach (var member in all) {
2181                                         switch (member.MemberType) {
2182                                         case MemberTypes.Constructor:
2183                                                 if (declaringType.IsInterface)
2184                                                         continue;
2185
2186                                                 goto case MemberTypes.Method;
2187                                         case MemberTypes.Method:
2188                                                 MethodBase mb = (MethodBase) member;
2189                                                 var attrs = mb.Attributes;
2190
2191                                                 if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
2192                                                         if (importer.IgnorePrivateMembers)
2193                                                                 continue;
2194
2195                                                         // Ignore explicitly implemented members
2196                                                         if ((attrs & explicit_impl) == explicit_impl)
2197                                                                 continue;
2198
2199                                                         // Ignore compiler generated methods
2200                                                         if (MetadataImporter.HasAttribute (CustomAttributeData.GetCustomAttributes (mb), "CompilerGeneratedAttribute", MetadataImporter.CompilerServicesNamespace))
2201                                                                 continue;
2202                                                 }
2203
2204                                                 imported = importer.CreateMethod (mb, declaringType);
2205                                                 if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
2206                                                         if (possible_accessors == null)
2207                                                                 possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
2208
2209                                                         // There are no metadata rules for accessors, we have to consider any method as possible candidate
2210                                                         possible_accessors.Add (mb, (MethodSpec) imported);
2211                                                 }
2212
2213                                                 break;
2214                                         case MemberTypes.Property:
2215                                                 if (possible_accessors == null)
2216                                                         continue;
2217
2218                                                 var p = (PropertyInfo) member;
2219                                                 //
2220                                                 // Links possible accessors with property
2221                                                 //
2222                                                 MethodSpec get, set;
2223                                                 m = p.GetGetMethod (true);
2224                                                 if (m == null || !possible_accessors.TryGetValue (m, out get))
2225                                                         get = null;
2226
2227                                                 m = p.GetSetMethod (true);
2228                                                 if (m == null || !possible_accessors.TryGetValue (m, out set))
2229                                                         set = null;
2230
2231                                                 // No accessors registered (e.g. explicit implementation)
2232                                                 if (get == null && set == null)
2233                                                         continue;
2234
2235                                                 try {
2236                                                         imported = importer.CreateProperty (p, declaringType, get, set);
2237                                                 } catch (Exception ex) {
2238                                                         throw new InternalErrorException (ex, "Could not import property `{0}' inside `{1}'",
2239                                                                 p.Name, declaringType.GetSignatureForError ());
2240                                                 }
2241
2242                                                 if (imported == null)
2243                                                         continue;
2244
2245                                                 break;
2246                                         case MemberTypes.Event:
2247                                                 if (possible_accessors == null)
2248                                                         continue;
2249
2250                                                 var e = (EventInfo) member;
2251                                                 //
2252                                                 // Links accessors with event
2253                                                 //
2254                                                 MethodSpec add, remove;
2255                                                 m = e.GetAddMethod (true);
2256                                                 if (m == null || !possible_accessors.TryGetValue (m, out add))
2257                                                         add = null;
2258
2259                                                 m = e.GetRemoveMethod (true);
2260                                                 if (m == null || !possible_accessors.TryGetValue (m, out remove))
2261                                                         remove = null;
2262
2263                                                 // Both accessors are required
2264                                                 if (add == null || remove == null)
2265                                                         continue;
2266
2267                                                 event_spec = importer.CreateEvent (e, declaringType, add, remove);
2268                                                 if (!importer.IgnorePrivateMembers) {
2269                                                         if (imported_events == null)
2270                                                                 imported_events = new List<EventSpec> ();
2271
2272                                                         imported_events.Add (event_spec);
2273                                                 }
2274
2275                                                 imported = event_spec;
2276                                                 break;
2277                                         case MemberTypes.Field:
2278                                                 var fi = (FieldInfo) member;
2279
2280                                                 imported = importer.CreateField (fi, declaringType);
2281                                                 if (imported == null)
2282                                                         continue;
2283
2284                                                 //
2285                                                 // For dynamic binder event has to be fully restored to allow operations
2286                                                 // within the type container to work correctly
2287                                                 //
2288                                                 if (imported_events != null) {
2289                                                         // The backing event field should be private but it may not
2290                                                         int i;
2291                                                         for (i = 0; i < imported_events.Count; ++i) {
2292                                                                 var ev = imported_events[i];
2293                                                                 if (ev.Name == fi.Name) {
2294                                                                         ev.BackingField = (FieldSpec) imported;
2295                                                                         imported_events.RemoveAt (i);
2296                                                                         i = -1;
2297                                                                         break;
2298                                                                 }
2299                                                         }
2300
2301                                                         if (i < 0)
2302                                                                 continue;
2303                                                 }
2304
2305                                                 break;
2306                                         case MemberTypes.NestedType:
2307                                                 // Already in the cache from the first pass
2308                                                 continue;
2309                                         default:
2310                                                 throw new NotImplementedException (member.ToString ());
2311                                         }
2312
2313                                         if (imported.IsStatic && declaringType.IsInterface)
2314                                                 continue;
2315
2316                                         cache.AddMemberImported (imported);
2317                                 }
2318                         }
2319                 }
2320         }
2321
2322         class ImportedTypeParameterDefinition : ImportedDefinition, ITypeDefinition
2323         {
2324                 public ImportedTypeParameterDefinition (MetaType type, MetadataImporter importer)
2325                         : base (type, importer)
2326                 {
2327                 }
2328
2329                 #region Properties
2330
2331                 public IAssemblyDefinition DeclaringAssembly {
2332                         get {
2333                                 throw new NotImplementedException ();
2334                         }
2335                 }
2336
2337                 bool ITypeDefinition.IsComImport {
2338                         get {
2339                                 return false;
2340                         }
2341                 }
2342
2343                 bool ITypeDefinition.IsPartial {
2344                         get {
2345                                 return false;
2346                         }
2347                 }
2348
2349                 bool ITypeDefinition.IsTypeForwarder {
2350                         get {
2351                                 return false;
2352                         }
2353                 }
2354
2355                 bool ITypeDefinition.IsCyclicTypeForwarder {
2356                         get {
2357                                 return false;
2358                         }
2359                 }
2360
2361                 public string Namespace {
2362                         get {
2363                                 return null;
2364                         }
2365                 }
2366
2367                 public int TypeParametersCount {
2368                         get {
2369                                 return 0;
2370                         }
2371                 }
2372
2373                 public TypeParameterSpec[] TypeParameters {
2374                         get {
2375                                 return null;
2376                         }
2377                 }
2378
2379                 #endregion
2380
2381                 public TypeSpec GetAttributeCoClass ()
2382                 {
2383                         return null;
2384                 }
2385
2386                 public string GetAttributeDefaultMember ()
2387                 {
2388                         throw new NotSupportedException ();
2389                 }
2390
2391                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2392                 {
2393                         throw new NotSupportedException ();
2394                 }
2395
2396                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2397                 {
2398                         throw new NotImplementedException ();
2399                 }
2400
2401                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2402                 {
2403                         throw new NotImplementedException ();
2404                 }
2405         }
2406 }