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), declaringType);
 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), declaringType);
 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, null);
 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                                 var mi = (MethodInfo)mb;
 418                                 returnType = ImportType (mi.ReturnType, new DynamicTypeReader (mi.ReturnParameter), declaringType);
 419
 420                                 //
 421                                 // Detect operators and destructors
 422                                 //
 423                                 string name = mb.Name;
 424                                 kind = MemberKind.Method;
 425                                 if (tparams == null && !mb.DeclaringType.IsInterface && name.Length > 6) {
 426                                         if ((mod & (Modifiers.STATIC | Modifiers.PUBLIC)) == (Modifiers.STATIC | Modifiers.PUBLIC)) {
 427                                                 if (name[2] == '_' && name[1] == 'p' && name[0] == 'o' && (mb.Attributes & MethodAttributes.SpecialName) != 0) {
 428                                                         var op_type = Operator.GetType (name);
 429                                                         if (op_type.HasValue && parameters.Count > 0 && parameters.Count < 3) {
 430                                                                 kind = MemberKind.Operator;
 431                                                         }
 432                                                 }
 433                                         } else if (parameters.IsEmpty && name == Destructor.MetadataName && returnType.Kind == MemberKind.Void) {
 434                                                 kind = MemberKind.Destructor;
 435                                                 if (declaringType.BuiltinType == BuiltinTypeSpec.Type.Object) {
 436                                                         mod &= ~Modifiers.OVERRIDE;
 437                                                         mod |= Modifiers.VIRTUAL;
 438                                                 }
 439                                         }
 440                                 }
 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), parent);  // 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), parent);
 553                                 } else {
 554                                         types[i] = ImportType (p.ParameterType, new DynamicTypeReader (p), parent);
 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                                                 set_based_param = IndexerSpec.CreateParametersFromSetter (set, set_param_count);
 649                                         }
 650
 651                                         mod = set.Modifiers;
 652                                         param = set_based_param;
 653                                         type = set_type;
 654                                 } else {
 655                                         if (set_param_count != get.Parameters.Count)
 656                                                 is_valid_property = false;
 657
 658                                         if (get.ReturnType != set_type)
 659                                                 is_valid_property = false;
 660
 661                                         // Possible custom accessor modifiers
 662                                         if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
 663                                                 var get_acc = mod & Modifiers.AccessibilityMask;
 664                                                 if (get_acc != Modifiers.PUBLIC) {
 665                                                         var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
 666                                                         // If the accessor modifiers are not same, do extra restriction checks
 667                                                         if (get_acc != set_acc) {
 668                                                                 var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
 669                                                                 var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
 670                                                                 if (get_restr && set_restr) {
 671                                                                         is_valid_property = false; // Neither is more restrictive
 672                                                                 }
 673
 674                                                                 if (get_restr) {
 675                                                                         mod &= ~Modifiers.AccessibilityMask;
 676                                                                         mod |= set_acc;
 677                                                                 }
 678                                                         }
 679                                                 }
 680                                         }
 681                                 }
 682                         }
 683
 684                         PropertySpec spec = null;
 685                         if (!param.IsEmpty) {
 686                                 if (is_valid_property) {
 687                                         var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
 688                                         if (index_name == null || index_name != pi.Name) {
 689                                                 is_valid_property = false;
 690                                         } else {
 691                                                 if (get != null) {
 692                                                         if (get.IsStatic)
 693                                                                 is_valid_property = false;
 694                                                 }
 695                                                 if (set != null) {
 696                                                         if (set.IsStatic)
 697                                                                 is_valid_property = false;
 698                                                 }
 699                                         }
 700
 701                                         if (is_valid_property) {
 702                                                 spec = new IndexerSpec (declaringType, new ImportedParameterMemberDefinition (pi, type, param, this), type, param, pi, mod);
 703                                         } else if (declaringType.MemberDefinition.IsComImport && param.FixedParameters[0].HasDefaultValue) {
 704                                                 //
 705                                                 // Enables support for properties with parameters (must have default value) of COM-imported types
 706                                                 //
 707                                                 is_valid_property = true;
 708
 709                                                 for (int i = 0; i < param.FixedParameters.Length; ++i) {
 710                                                         if (!param.FixedParameters[i].HasDefaultValue) {
 711                                                                 is_valid_property = false;
 712                                                                 break;
 713                                                         }
 714                                                 }
 715                                         }
 716                                 }
 717                         }
 718
 719                         if (spec == null)
 720                                 spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi, type, this), type, pi, mod);
 721
 722                         if (!is_valid_property) {
 723                                 spec.IsNotCSharpCompatible = true;
 724                                 return spec;
 725                         }
 726
 727                         if (set != null)
 728                                 spec.Set = set;
 729                         if (get != null)
 730                                 spec.Get = get;
 731
 732                         return spec;
 733                 }
 734
 735                 public TypeSpec CreateType (MetaType type)
 736                 {
 737                         return CreateType (type, new DynamicTypeReader (), true);
 738                 }
 739
 740                 public TypeSpec CreateNestedType (MetaType type, TypeSpec declaringType)
 741                 {
 742                         return CreateType (type, declaringType, new DynamicTypeReader (type), false);
 743                 }
 744
 745                 TypeSpec CreateType (MetaType type, DynamicTypeReader dtype, bool canImportBaseType)
 746                 {
 747                         TypeSpec declaring_type;
 748                         if (type.IsNested && !type.IsGenericParameter)
 749                                 declaring_type = CreateType (type.DeclaringType, new DynamicTypeReader (type.DeclaringType), true);
 750                         else
 751                                 declaring_type = null;
 752
 753                         return CreateType (type, declaring_type, dtype, canImportBaseType);
 754                 }
 755
 756                 protected TypeSpec CreateType (MetaType type, TypeSpec declaringType, DynamicTypeReader dtype, bool canImportBaseType)
 757                 {
 758                         TypeSpec spec;
 759                         if (import_cache.TryGetValue (type, out spec)) {
 760                                 if (spec.BuiltinType == BuiltinTypeSpec.Type.Object) {
 761                                         if (dtype.IsDynamicObject ())
 762                                                 return module.Compiler.BuiltinTypes.Dynamic;
 763
 764                                         return spec;
 765                                 }
 766
 767                                 if (!spec.IsGeneric || type.IsGenericTypeDefinition)
 768                                         return spec;
 769
 770                                 if (!dtype.HasDynamicAttribute ())
 771                                         return spec;
 772
 773                                 // We've found same object in the cache but this one has a dynamic custom attribute
 774                                 // and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
 775                                 // Do type resolve process again in that case
 776
 777                                 // TODO: Handle cases where they still unify
 778                         }
 779
 780                         if (IsMissingType (type)) {
 781                                 spec = new TypeSpec (MemberKind.MissingType, declaringType, new ImportedTypeDefinition (type, this), type, Modifiers.PUBLIC);
 782                                 spec.MemberCache = MemberCache.Empty;
 783                                 import_cache.Add (type, spec);
 784                                 return spec;
 785                         }
 786
 787                         if (type.IsGenericType && !type.IsGenericTypeDefinition) {
 788                                 var type_def = type.GetGenericTypeDefinition ();
 789
 790                                 // Generic type definition can also be forwarded
 791                                 if (compiled_types.TryGetValue (type_def, out spec))
 792                                         return spec;
 793
 794                                 var targs = CreateGenericArguments (0, type.GetGenericArguments (), dtype);
 795                                 if (targs == null)
 796                                         return null;
 797                                 if (declaringType == null) {
 798                                         // Simple case, no nesting
 799                                         spec = CreateType (type_def, null, new DynamicTypeReader (), canImportBaseType);
 800                                         spec = spec.MakeGenericType (module, targs);
 801                                 } else {
 802                                         //
 803                                         // Nested type case, converting .NET types like
 804                                         // A`1.B`1.C`1<int, long, string> to typespec like
 805                                         // A<int>.B<long>.C<string>
 806                                         //
 807                                         var nested_hierarchy = new List<TypeSpec> ();
 808                                         while (declaringType.IsNested) {
 809                                                 nested_hierarchy.Add (declaringType);
 810                                                 declaringType = declaringType.DeclaringType;
 811                                         }
 812
 813                                         int targs_pos = 0;
 814                                         if (declaringType.Arity > 0) {
 815                                                 spec = declaringType.MakeGenericType (module, targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
 816                                                 targs_pos = spec.Arity;
 817                                         } else {
 818                                                 spec = declaringType;
 819                                         }
 820
 821                                         for (int i = nested_hierarchy.Count; i != 0; --i) {
 822                                                 var t = nested_hierarchy [i - 1];
 823                                                 if (t.Kind == MemberKind.MissingType)
 824                                                         spec = t;
 825                                                 else
 826                                                         spec = MemberCache.FindNestedType (spec, t.Name, t.Arity, false);
 827
 828                                                 if (t.Arity > 0) {
 829                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
 830                                                         targs_pos += t.Arity;
 831                                                 }
 832                                         }
 833
 834                                         if (spec.Kind == MemberKind.MissingType) {
 835                                                 spec = new TypeSpec (MemberKind.MissingType, spec, new ImportedTypeDefinition (type_def, this), type_def, Modifiers.PUBLIC);
 836                                                 spec.MemberCache = MemberCache.Empty;
 837                                         } else {
 838                                                 if ((type_def.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && IgnorePrivateMembers)
 839                                                         return null;
 840
 841                                                 string name = type.Name;
 842                                                 int index = name.IndexOf ('`');
 843                                                 if (index > 0)
 844                                                         name = name.Substring (0, index);
 845
 846                                                 spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos, false);
 847
 848                                                 if (spec.Arity > 0) {
 849                                                         spec = spec.MakeGenericType (module, targs.Skip (targs_pos).ToArray ());
 850                                                 }
 851                                         }
 852                                 }
 853
 854                                 // Don't add generic type with dynamic arguments, they can interfere with same type
 855                                 // using object type arguments
 856                                 if (!spec.HasDynamicElement) {
 857
 858                                         // Add to reading cache to speed up reading
 859                                         if (!import_cache.ContainsKey (type))
 860                                                 import_cache.Add (type, spec);
 861                                 }
 862
 863                                 return spec;
 864                         }
 865
 866                         Modifiers mod;
 867                         MemberKind kind;
 868
 869                         var ma = type.Attributes;
 870                         switch (ma & TypeAttributes.VisibilityMask) {
 871                         case TypeAttributes.Public:
 872                         case TypeAttributes.NestedPublic:
 873                                 mod = Modifiers.PUBLIC;
 874                                 break;
 875                         case TypeAttributes.NestedPrivate:
 876                                 mod = Modifiers.PRIVATE;
 877                                 break;
 878                         case TypeAttributes.NestedFamily:
 879                                 mod = Modifiers.PROTECTED;
 880                                 break;
 881                         case TypeAttributes.NestedFamORAssem:
 882                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
 883                                 break;
 884                         default:
 885                                 mod = Modifiers.INTERNAL;
 886                                 break;
 887                         }
 888
 889                         if ((ma & TypeAttributes.Interface) != 0) {
 890                                 kind = MemberKind.Interface;
 891                         } else if (type.IsGenericParameter) {
 892                                 kind = MemberKind.TypeParameter;
 893                         } else {
 894                                 var base_type = type.BaseType;
 895                                 if (base_type == null || (ma & TypeAttributes.Abstract) != 0) {
 896                                         kind = MemberKind.Class;
 897                                 } else {
 898                                         kind = DetermineKindFromBaseType (base_type);
 899                                         if (kind == MemberKind.Struct || kind == MemberKind.Delegate) {
 900                                                 mod |= Modifiers.SEALED;
 901                                         }
 902                                 }
 903
 904                                 if (kind == MemberKind.Class) {
 905                                         if ((ma & TypeAttributes.Sealed) != 0) {
 906                                                 if ((ma & TypeAttributes.Abstract) != 0)
 907                                                         mod |= Modifiers.STATIC;
 908                                                 else
 909                                                         mod |= Modifiers.SEALED;
 910                                         } else if ((ma & TypeAttributes.Abstract) != 0) {
 911                                                 mod |= Modifiers.ABSTRACT;
 912                                         }
 913                                 }
 914                         }
 915
 916                         var definition = new ImportedTypeDefinition (type, this);
 917                         TypeSpec pt;
 918
 919                         if (kind == MemberKind.Enum) {
 920                                 const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
 921                                         BindingFlags.Instance |
 922                                         BindingFlags.Public | BindingFlags.NonPublic;
 923
 924                                 var type_members = type.GetFields (underlying_member);
 925                                 foreach (var type_member in type_members) {
 926                                         spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
 927                                         break;
 928                                 }
 929
 930                                 if (spec == null)
 931                                         kind = MemberKind.Class;
 932
 933                         } else if (kind == MemberKind.TypeParameter) {
 934                                 spec = CreateTypeParameter (type, declaringType);
 935                         } else if (type.IsGenericTypeDefinition) {
 936                                 definition.TypeParameters = CreateGenericParameters (type, declaringType);
 937                         } else if (compiled_types.TryGetValue (type, out pt)) {
 938                                 //
 939                                 // Same type was found in inside compiled types. It's
 940                                 // either build-in type or forward referenced typed
 941                                 // which point into just compiled assembly.
 942                                 //
 943                                 spec = pt;
 944                                 BuiltinTypeSpec bts = pt as BuiltinTypeSpec;
 945                                 if (bts != null)
 946                                         bts.SetDefinition (definition, type, mod);
 947                         }
 948
 949                         if (spec == null)
 950                                 spec = new TypeSpec (kind, declaringType, definition, type, mod);
 951
 952                         import_cache.Add (type, spec);
 953
 954                         if (kind == MemberKind.TypeParameter) {
 955                                 if (canImportBaseType)
 956                                         ImportTypeParameterTypeConstraints ((TypeParameterSpec) spec, type);
 957
 958                                 return spec;
 959                         }
 960
 961                         //
 962                         // Two stage setup as the base type can be inflated declaring type or
 963                         // another nested type inside same declaring type which has not been
 964                         // loaded, therefore we can import a base type of nested types once
 965                         // the types have been imported
 966                         //
 967                         if (canImportBaseType)
 968                                 ImportTypeBase (spec, type);
 969
 970                         return spec;
 971                 }
 972
 973                 public IAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
 974                 {
 975                         IAssemblyDefinition found;
 976                         if (!assembly_2_definition.TryGetValue (assembly, out found)) {
 977
 978                                 // This can happen in dynamic context only
 979                                 var def = new ImportedAssemblyDefinition (assembly);
 980                                 assembly_2_definition.Add (assembly, def);
 981                                 def.ReadAttributes ();
 982                                 found = def;
 983                         }
 984
 985                         return found;
 986                 }
 987
 988                 public ImportedAssemblyDefinition GetImportedAssemblyDefinition (AssemblyName assemblyName)
 989                 {
 990                         foreach (var a in Assemblies) {
 991                                 var ia = a as ImportedAssemblyDefinition;
 992                                 if (ia == null)
 993                                         continue;
 994
 995                                 if (a.Name == assemblyName.Name)
 996                                         return ia;
 997                         }
 998
 999                         return null;
1000                 }
1001
1002
1003                 public void ImportTypeBase (MetaType type)
1004                 {
1005                         TypeSpec spec = import_cache[type];
1006                         if (spec != null)
1007                                 ImportTypeBase (spec, type);
1008                 }
1009
1010                 TypeParameterSpec CreateTypeParameter (MetaType type, TypeSpec declaringType)
1011                 {
1012                         Variance variance;
1013                         switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
1014                         case GenericParameterAttributes.Covariant:
1015                                 variance = Variance.Covariant;
1016                                 break;
1017                         case GenericParameterAttributes.Contravariant:
1018                                 variance = Variance.Contravariant;
1019                                 break;
1020                         default:
1021                                 variance = Variance.None;
1022                                 break;
1023                         }
1024
1025                         SpecialConstraint special = SpecialConstraint.None;
1026                         var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
1027
1028                         if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
1029                                 special |= SpecialConstraint.Struct;
1030                         } else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
1031                                 special = SpecialConstraint.Constructor;
1032                         }
1033
1034                         if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
1035                                 special |= SpecialConstraint.Class;
1036                         }
1037
1038                         TypeParameterSpec spec;
1039                         var def = new ImportedTypeParameterDefinition (type, this);
1040                         if (type.DeclaringMethod != null) {
1041                                 spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
1042                         } else {
1043                                 spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
1044                         }
1045
1046                         return spec;
1047                 }
1048
1049                 //
1050                 // Test for a custom attribute type match. Custom attributes are not really predefined globaly
1051                 // they can be assembly specific therefore we do check based on names only
1052                 //
1053                 public static bool HasAttribute (IList<CustomAttributeData> attributesData, string attrName, string attrNamespace)
1054                 {
1055                         if (attributesData.Count == 0)
1056                                 return false;
1057
1058                         foreach (var attr in attributesData) {
1059                                 var dt = attr.Constructor.DeclaringType;
1060                                 if (dt.Name == attrName && dt.Namespace == attrNamespace)
1061                                         return true;
1062                         }
1063
1064                         return false;
1065                 }
1066
1067                 void ImportTypeBase (TypeSpec spec, MetaType type)
1068                 {
1069                         if (spec.Kind == MemberKind.Interface)
1070                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1071                         else if (type.BaseType != null) {
1072                                 TypeSpec base_type;
1073                                 if (!IsMissingType (type.BaseType) && type.BaseType.IsGenericType)
1074                                         base_type = CreateType (type.BaseType, new DynamicTypeReader (type), true);
1075                                 else
1076                                         base_type = CreateType (type.BaseType);
1077
1078                                 spec.BaseType = base_type;
1079                         }
1080
1081                         if (spec.MemberDefinition.TypeParametersCount > 0) {
1082                                 foreach (var tp in spec.MemberDefinition.TypeParameters) {
1083                                         ImportTypeParameterTypeConstraints (tp, tp.GetMetaInfo ());
1084                                 }
1085                         }
1086                 }
1087
1088                 public void ImportTypes (MetaType[] types, Namespace targetNamespace, bool importExtensionTypes)
1089                 {
1090                         Namespace ns = targetNamespace;
1091                         string prev_namespace = null;
1092                         foreach (var t in types) {
1093                                 if (t == null)
1094                                         continue;
1095
1096                                 // Be careful not to trigger full parent type loading
1097                                 if (t.MemberType == MemberTypes.NestedType)
1098                                         continue;
1099
1100                                 if (t.Name[0] == '<')
1101                                         continue;
1102
1103                                 var it = CreateType (t, null, new DynamicTypeReader (t), true);
1104                                 if (it == null)
1105                                         continue;
1106
1107                                 if (prev_namespace != t.Namespace) {
1108                                         ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
1109                                         prev_namespace = t.Namespace;
1110                                 }
1111
1112                                 // Cannot rely on assembly level Extension attribute or static modifier because they
1113                                 // are not followed by other compilers (e.g. F#).
1114                                 if (it.IsClass && it.Arity == 0 && importExtensionTypes &&
1115                                         HasAttribute (CustomAttributeData.GetCustomAttributes (t), "ExtensionAttribute", CompilerServicesNamespace)) {
1116                                         it.SetExtensionMethodContainer ();
1117                                 }
1118
1119                                 ns.AddType (module, it);
1120                         }
1121                 }
1122
1123                 void ImportTypeParameterTypeConstraints (TypeParameterSpec spec, MetaType type)
1124                 {
1125                         var constraints = type.GetGenericParameterConstraints ();
1126                         List<TypeSpec> tparams = null;
1127                         foreach (var ct in constraints) {
1128                                 if (ct.IsGenericParameter) {
1129                                         if (tparams == null)
1130                                                 tparams = new List<TypeSpec> ();
1131
1132                                         tparams.Add (CreateType (ct));
1133                                         continue;
1134                                 }
1135
1136                                 var constraint_type = CreateType (ct);
1137                                 if (constraint_type.IsClass) {
1138                                         spec.BaseType = constraint_type;
1139                                         continue;
1140                                 }
1141
1142                                 spec.AddInterface (constraint_type);
1143                         }
1144
1145                         if (spec.BaseType == null)
1146                                 spec.BaseType = module.Compiler.BuiltinTypes.Object;
1147
1148                         if (tparams != null)
1149                                 spec.TypeArguments = tparams.ToArray ();
1150                 }
1151
1152                 Constant ImportConstant (object value)
1153                 {
1154                         //
1155                         // Get type of underlying value as int constant can be used for object
1156                         // parameter type. This is not allowed in C# but other languages can do that
1157                         //
1158                         var types = module.Compiler.BuiltinTypes;
1159                         switch (System.Type.GetTypeCode (value.GetType ())) {
1160                         case TypeCode.Boolean:
1161                                 return new BoolConstant (types, (bool) value, Location.Null);
1162                         case TypeCode.Byte:
1163                                 return new ByteConstant (types, (byte) value, Location.Null);
1164                         case TypeCode.Char:
1165                                 return new CharConstant (types, (char) value, Location.Null);
1166                         case TypeCode.Decimal:
1167                                 return new DecimalConstant (types, (decimal) value, Location.Null);
1168                         case TypeCode.Double:
1169                                 return new DoubleConstant (types, (double) value, Location.Null);
1170                         case TypeCode.Int16:
1171                                 return new ShortConstant (types, (short) value, Location.Null);
1172                         case TypeCode.Int32:
1173                                 return new IntConstant (types, (int) value, Location.Null);
1174                         case TypeCode.Int64:
1175                                 return new LongConstant (types, (long) value, Location.Null);
1176                         case TypeCode.SByte:
1177                                 return new SByteConstant (types, (sbyte) value, Location.Null);
1178                         case TypeCode.Single:
1179                                 return new FloatConstant (types, (float) value, Location.Null);
1180                         case TypeCode.String:
1181                                 return new StringConstant (types, (string) value, Location.Null);
1182                         case TypeCode.UInt16:
1183                                 return new UShortConstant (types, (ushort) value, Location.Null);
1184                         case TypeCode.UInt32:
1185                                 return new UIntConstant (types, (uint) value, Location.Null);
1186                         case TypeCode.UInt64:
1187                                 return new ULongConstant (types, (ulong) value, Location.Null);
1188                         }
1189
1190                         throw new NotImplementedException (value.GetType ().ToString ());
1191                 }
1192
1193                 public TypeSpec ImportType (MetaType type)
1194                 {
1195                         return ImportType (type, new DynamicTypeReader (type), null);
1196                 }
1197
1198                 TypeSpec ImportType (MetaType type, DynamicTypeReader dtype, TypeSpec currentType)
1199                 {
1200                         if (type.HasElementType) {
1201                                 var element = type.GetElementType ();
1202                                 ++dtype.Position;
1203                                 var spec = ImportType (element, dtype, currentType);
1204
1205                                 if (type.IsArray)
1206                                         return ArrayContainer.MakeType (module, spec, type.GetArrayRank ());
1207                                 if (type.IsByRef)
1208                                         return ReferenceContainer.MakeType (module, spec);
1209                                 if (type.IsPointer)
1210                                         return PointerContainer.MakeType (module, spec);
1211
1212                                 throw new NotImplementedException ("Unknown element type " + type.ToString ());
1213                         }
1214
1215                         TypeSpec compiled_type;
1216                         if (compiled_types.TryGetValue (type, out compiled_type)) {
1217                                 if (compiled_type.BuiltinType == BuiltinTypeSpec.Type.Object && dtype.IsDynamicObject ())
1218                                         return module.Compiler.BuiltinTypes.Dynamic;
1219                         } else {
1220                                 compiled_type = CreateType (type, dtype, true);
1221                         }
1222
1223                         if (currentType == compiled_type && currentType?.IsGeneric == true) {
1224                                 //
1225                                 // Inflates current type to match behaviour of TypeDefinition::CurrentType used by compiled types
1226                                 //
1227                                 var targs = compiled_type.MemberDefinition.TypeParameters;
1228                                 compiled_type = compiled_type.MakeGenericType (module, targs);
1229                         }
1230
1231                         return compiled_type;
1232                 }
1233
1234                 static bool IsMissingType (MetaType type)
1235                 {
1236 #if STATIC
1237                         return type.__IsMissing;
1238 #else
1239                         return false;
1240 #endif
1241                 }
1242
1243                 //
1244                 // Decimal constants cannot be encoded in the constant blob, and thus are marked
1245                 // as IsInitOnly ('readonly' in C# parlance).  We get its value from the
1246                 // DecimalConstantAttribute metadata.
1247                 //
1248                 Constant ReadDecimalConstant (IList<CustomAttributeData> attrs)
1249                 {
1250                         if (attrs.Count == 0)
1251                                 return null;
1252
1253                         foreach (var ca in attrs) {
1254                                 var dt = ca.Constructor.DeclaringType;
1255                                 if (dt.Name != "DecimalConstantAttribute" || dt.Namespace != CompilerServicesNamespace)
1256                                         continue;
1257
1258                                 var value = new decimal (
1259                                         (int) (uint) ca.ConstructorArguments[4].Value,
1260                                         (int) (uint) ca.ConstructorArguments[3].Value,
1261                                         (int) (uint) ca.ConstructorArguments[2].Value,
1262                                         (byte) ca.ConstructorArguments[1].Value != 0,
1263                                         (byte) ca.ConstructorArguments[0].Value);
1264
1265                                 return new DecimalConstant (module.Compiler.BuiltinTypes, value, Location.Null);
1266                         }
1267
1268                         return null;
1269                 }
1270
1271                 static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
1272                 {
1273                         Modifiers mod;
1274                         var ma = mb.Attributes;
1275                         switch (ma & MethodAttributes.MemberAccessMask) {
1276                         case MethodAttributes.Public:
1277                                 mod = Modifiers.PUBLIC;
1278                                 break;
1279                         case MethodAttributes.Assembly:
1280                                 mod = Modifiers.INTERNAL;
1281                                 break;
1282                         case MethodAttributes.Family:
1283                                 mod = Modifiers.PROTECTED;
1284                                 break;
1285                         case MethodAttributes.FamORAssem:
1286                                 mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
1287                                 break;
1288                         default:
1289                                 mod = Modifiers.PRIVATE;
1290                                 break;
1291                         }
1292
1293                         if ((ma & MethodAttributes.Static) != 0) {
1294                                 mod |= Modifiers.STATIC;
1295                                 return mod;
1296                         }
1297                         if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
1298                                 mod |= Modifiers.ABSTRACT;
1299                                 return mod;
1300                         }
1301
1302                         // It can be sealed and override
1303                         if ((ma & MethodAttributes.Final) != 0)
1304                                 mod |= Modifiers.SEALED;
1305
1306                         if ((ma & MethodAttributes.Virtual) != 0) {
1307                                 // Not every member can be detected based on MethodAttribute, we
1308                                 // set virtual or non-virtual only when we are certain. Further checks
1309                                 // to really find out what `virtual' means for this member are done
1310                                 // later
1311                                 if ((ma & MethodAttributes.NewSlot) != 0) {
1312                                         if ((mod & Modifiers.SEALED) != 0) {
1313                                                 mod &= ~Modifiers.SEALED;
1314                                         } else {
1315                                                 mod |= Modifiers.VIRTUAL;
1316                                         }
1317                                 } else {
1318                                         mod |= Modifiers.OVERRIDE;
1319                                 }
1320                         }
1321
1322                         return mod;
1323                 }
1324         }
1325
1326         abstract class ImportedDefinition : IMemberDefinition
1327         {
1328                 protected class AttributesBag
1329                 {
1330                         public static readonly AttributesBag Default = new AttributesBag ();
1331
1332                         public AttributeUsageAttribute AttributeUsage;
1333                         public ObsoleteAttribute Obsolete;
1334                         public string[] Conditionals;
1335                         public string DefaultIndexerName;
1336                         public bool? CLSAttributeValue;
1337                         public TypeSpec CoClass;
1338
1339                         static bool HasMissingType (ConstructorInfo ctor)
1340                         {
1341 #if STATIC
1342                                 //
1343                                 // Mimic odd csc behaviour where missing type on predefined
1344                                 // attributes means the attribute is silently ignored. This can
1345                                 // happen with PCL facades
1346                                 //
1347                                 foreach (var p in ctor.GetParameters ()) {
1348                                         if (p.ParameterType.__ContainsMissingType)
1349                                                 return true;
1350                                 }
1351 #endif
1352
1353                                 return false;
1354                         }
1355
1356                         public static AttributesBag Read (MemberInfo mi, MetadataImporter importer)
1357                         {
1358                                 AttributesBag bag = null;
1359                                 List<string> conditionals = null;
1360
1361                                 // It should not throw any loading exception
1362                                 IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
1363
1364                                 foreach (var a in attrs) {
1365                                         var dt = a.Constructor.DeclaringType;
1366                                         string name = dt.Name;
1367                                         if (name == "ObsoleteAttribute") {
1368                                                 if (dt.Namespace != "System")
1369                                                         continue;
1370
1371                                                 if (bag == null)
1372                                                         bag = new AttributesBag ();
1373
1374                                                 var args = a.ConstructorArguments;
1375
1376                                                 if (args.Count == 1) {
1377                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
1378                                                 } else if (args.Count == 2) {
1379                                                         bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
1380                                                 } else {
1381                                                         bag.Obsolete = new ObsoleteAttribute ();
1382                                                 }
1383
1384                                                 continue;
1385                                         }
1386
1387                                         if (name == "ConditionalAttribute") {
1388                                                 if (dt.Namespace != "System.Diagnostics")
1389                                                         continue;
1390
1391                                                 if (bag == null)
1392                                                         bag = new AttributesBag ();
1393
1394                                                 if (conditionals == null)
1395                                                         conditionals = new List<string> (2);
1396
1397                                                 conditionals.Add ((string) a.ConstructorArguments[0].Value);
1398                                                 continue;
1399                                         }
1400
1401                                         if (name == "CLSCompliantAttribute") {
1402                                                 if (dt.Namespace != "System")
1403                                                         continue;
1404
1405                                                 if (bag == null)
1406                                                         bag = new AttributesBag ();
1407
1408                                                 bag.CLSAttributeValue = (bool) a.ConstructorArguments[0].Value;
1409                                                 continue;
1410                                         }
1411
1412                                         // Type only attributes
1413                                         if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
1414                                                 if (name == "DefaultMemberAttribute") {
1415                                                         if (dt.Namespace != "System.Reflection")
1416                                                                 continue;
1417
1418                                                         if (bag == null)
1419                                                                 bag = new AttributesBag ();
1420
1421                                                         bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
1422                                                         continue;
1423                                                 }
1424
1425                                                 if (name == "AttributeUsageAttribute") {
1426                                                         if (dt.Namespace != "System")
1427                                                                 continue;
1428
1429                                                         if (HasMissingType (a.Constructor))
1430                                                                 continue;
1431
1432                                                         if (bag == null)
1433                                                                 bag = new AttributesBag ();
1434
1435                                                         bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
1436                                                         foreach (var named in a.NamedArguments) {
1437                                                                 if (named.MemberInfo.Name == "AllowMultiple")
1438                                                                         bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
1439                                                                 else if (named.MemberInfo.Name == "Inherited")
1440                                                                         bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
1441                                                         }
1442                                                         continue;
1443                                                 }
1444
1445                                                 // Interface only attribute
1446                                                 if (name == "CoClassAttribute") {
1447                                                         if (dt.Namespace != "System.Runtime.InteropServices")
1448                                                                 continue;
1449
1450                                                         if (HasMissingType (a.Constructor))
1451                                                                 continue;
1452
1453                                                         if (bag == null)
1454                                                                 bag = new AttributesBag ();
1455
1456                                                         bag.CoClass = importer.ImportType ((MetaType) a.ConstructorArguments[0].Value);
1457                                                         continue;
1458                                                 }
1459                                         }
1460                                 }
1461
1462                                 if (bag == null)
1463                                         return Default;
1464
1465                                 if (conditionals != null)
1466                                         bag.Conditionals = conditionals.ToArray ();
1467
1468                                 return bag;
1469                         }
1470                 }
1471
1472                 protected readonly MemberInfo provider;
1473                 protected AttributesBag cattrs;
1474                 protected readonly MetadataImporter importer;
1475
1476                 protected ImportedDefinition (MemberInfo provider, MetadataImporter importer)
1477                 {
1478                         this.provider = provider;
1479                         this.importer = importer;
1480                 }
1481
1482                 #region Properties
1483
1484                 public bool IsImported {
1485                         get {
1486                                 return true;
1487                         }
1488                 }
1489
1490                 public virtual string Name {
1491                         get {
1492                                 return provider.Name;
1493                         }
1494                 }
1495
1496                 #endregion
1497
1498                 public string[] ConditionalConditions ()
1499                 {
1500                         if (cattrs == null)
1501                                 ReadAttributes ();
1502
1503                         return cattrs.Conditionals;
1504                 }
1505
1506                 public ObsoleteAttribute GetAttributeObsolete ()
1507                 {
1508                         if (cattrs == null)
1509                                 ReadAttributes ();
1510
1511                         return cattrs.Obsolete;
1512                 }
1513
1514                 public bool? CLSAttributeValue {
1515                         get {
1516                                 if (cattrs == null)
1517                                         ReadAttributes ();
1518
1519                                 return cattrs.CLSAttributeValue;
1520                         }
1521                 }
1522
1523                 protected void ReadAttributes ()
1524                 {
1525                         cattrs = AttributesBag.Read (provider, importer);
1526                 }
1527
1528                 public void SetIsAssigned ()
1529                 {
1530                         // Unused for imported members
1531                 }
1532
1533                 public void SetIsUsed ()
1534                 {
1535                         // Unused for imported members
1536                 }
1537         }
1538
1539         public class ImportedModuleDefinition
1540         {
1541                 readonly Module module;
1542                 bool cls_compliant;
1543
1544                 public ImportedModuleDefinition (Module module)
1545                 {
1546                         this.module = module;
1547                 }
1548
1549                 #region Properties
1550
1551                 public bool IsCLSCompliant {
1552                         get {
1553                                 return cls_compliant;
1554                         }
1555                 }
1556
1557                 public string Name {
1558                         get {
1559                                 return module.Name;
1560                         }
1561                 }
1562
1563                 #endregion
1564
1565                 public void ReadAttributes ()
1566                 {
1567                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
1568
1569                         foreach (var a in attrs) {
1570                                 var dt = a.Constructor.DeclaringType;
1571                                 if (dt.Name == "CLSCompliantAttribute") {
1572                                         if (dt.Namespace != "System")
1573                                                 continue;
1574
1575                                         cls_compliant = (bool) a.ConstructorArguments[0].Value;
1576                                         continue;
1577                                 }
1578                         }
1579                 }
1580
1581                 //
1582                 // Reads assembly attributes which where attached to a special type because
1583                 // module does have assembly manifest
1584                 //
1585                 public List<Attribute> ReadAssemblyAttributes ()
1586                 {
1587                         var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
1588                         if (t == null)
1589                                 return null;
1590
1591                         var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
1592                         if (field == null)
1593                                 return null;
1594
1595                         // TODO: implement, the idea is to fabricate specil Attribute class and
1596                         // add it to OptAttributes before resolving the source code attributes
1597                         // Need to build module location as well for correct error reporting
1598
1599                         //var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
1600                         //var attrs = new List<Attribute> (assembly_attributes.Count);
1601                         //foreach (var a in assembly_attributes)
1602                         //{
1603                         //    var type = metaImporter.ImportType (a.Constructor.DeclaringType);
1604                         //    var ctor = metaImporter.CreateMethod (a.Constructor, type);
1605
1606                         //    foreach (var carg in a.ConstructorArguments) {
1607                         //        carg.Value
1608                         //    }
1609
1610                         //    attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
1611                         //}
1612
1613                         return null;
1614                 }
1615         }
1616
1617         public class ImportedAssemblyDefinition : IAssemblyDefinition
1618         {
1619                 readonly Assembly assembly;
1620                 readonly AssemblyName aname;
1621                 bool cls_compliant;
1622
1623                 List<AssemblyName> internals_visible_to;
1624                 Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
1625
1626                 public ImportedAssemblyDefinition (Assembly assembly)
1627                 {
1628                         this.assembly = assembly;
1629                         this.aname = assembly.GetName ();
1630                 }
1631
1632                 #region Properties
1633
1634                 public Assembly Assembly {
1635                         get {
1636                                 return assembly;
1637                         }
1638                 }
1639
1640                 public string FullName {
1641                         get {
1642                                 return aname.FullName;
1643                         }
1644                 }
1645
1646                 public bool HasStrongName {
1647                         get {
1648                                 return aname.GetPublicKey ().Length != 0;
1649                         }
1650                 }
1651
1652                 public bool IsMissing {
1653                         get {
1654 #if STATIC
1655                                 return assembly.__IsMissing;
1656 #else
1657                                 return false;
1658 #endif
1659                         }
1660                 }
1661
1662                 public bool IsCLSCompliant {
1663                         get {
1664                                 return cls_compliant;
1665                         }
1666                 }
1667
1668                 public string Location {
1669                         get {
1670                                 return assembly.Location;
1671                         }
1672                 }
1673
1674                 public string Name {
1675                         get {
1676                                 return aname.Name;
1677                         }
1678                 }
1679
1680                 #endregion
1681
1682                 public byte[] GetPublicKeyToken ()
1683                 {
1684                         return aname.GetPublicKeyToken ();
1685                 }
1686
1687                 public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
1688                 {
1689                         return internals_visible_to_cache [assembly];
1690                 }
1691
1692                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1693                 {
1694                         if (internals_visible_to == null)
1695                                 return false;
1696
1697                         AssemblyName is_visible = null;
1698                         if (internals_visible_to_cache == null) {
1699                                 internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
1700                         } else {
1701                                 if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
1702                                         return is_visible != null;
1703                         }
1704
1705                         var token = assembly.GetPublicKeyToken ();
1706                         if (token != null && token.Length == 0)
1707                                 token = null;
1708
1709                         foreach (var internals in internals_visible_to) {
1710                                 if (!String.Equals(internals.Name, assembly.Name, StringComparison.OrdinalIgnoreCase))
1711                                         continue;
1712
1713                                 if (token == null && assembly is AssemblyDefinition) {
1714                                         is_visible = internals;
1715                                         break;
1716                                 }
1717
1718                                 if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
1719                                         continue;
1720
1721                                 is_visible = internals;
1722                                 break;
1723                         }
1724
1725                         internals_visible_to_cache.Add (assembly, is_visible);
1726                         return is_visible != null;
1727                 }
1728
1729                 public void ReadAttributes ()
1730                 {
1731 #if STATIC
1732                         if (assembly.__IsMissing)
1733                                 return;
1734 #endif
1735
1736                         IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
1737
1738                         foreach (var a in attrs) {
1739                                 var dt = a.Constructor.DeclaringType;
1740                                 var name = dt.Name;
1741                                 if (name == "CLSCompliantAttribute") {
1742                                         if (dt.Namespace == "System") {
1743                                                 cls_compliant = (bool) a.ConstructorArguments[0].Value;
1744                                         }
1745                                         continue;
1746                                 }
1747
1748                                 if (name == "InternalsVisibleToAttribute") {
1749                                         if (dt.Namespace != MetadataImporter.CompilerServicesNamespace)
1750                                                 continue;
1751
1752                                         string s = a.ConstructorArguments[0].Value as string;
1753                                         if (s == null)
1754                                                 continue;
1755
1756                                         AssemblyName an;
1757                                         try {
1758                                                 an = new AssemblyName (s);
1759                                         } catch (FileLoadException) {
1760                                                 // Invalid assembly name reuses FileLoadException
1761                                                 continue;
1762                                         }
1763
1764                                         if (internals_visible_to == null)
1765                                                 internals_visible_to = new List<AssemblyName> ();
1766
1767                                         internals_visible_to.Add (an);
1768                                         continue;
1769                                 }
1770                         }
1771                 }
1772
1773                 public override string ToString ()
1774                 {
1775                         return FullName;
1776                 }
1777         }
1778
1779         class ImportedMemberDefinition : ImportedDefinition
1780         {
1781                 readonly TypeSpec type;
1782
1783                 public ImportedMemberDefinition (MemberInfo member, TypeSpec type, MetadataImporter importer)
1784                         : base (member, importer)
1785                 {
1786                         this.type = type;
1787                 }
1788
1789                 #region Properties
1790
1791                 public TypeSpec MemberType {
1792                         get {
1793                                 return type;
1794                         }
1795                 }
1796
1797                 #endregion
1798         }
1799
1800         class ImportedParameterMemberDefinition : ImportedMemberDefinition, IParametersMember
1801         {
1802                 readonly AParametersCollection parameters;
1803
1804                 protected ImportedParameterMemberDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1805                         : base (provider, type, importer)
1806                 {
1807                         this.parameters = parameters;
1808                 }
1809
1810                 public ImportedParameterMemberDefinition (PropertyInfo provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1811                         : base (provider, type, importer)
1812                 {
1813                         this.parameters = parameters;
1814                 }
1815
1816                 #region Properties
1817
1818                 public AParametersCollection Parameters {
1819                         get {
1820                                 return parameters;
1821                         }
1822                 }
1823
1824                 #endregion
1825         }
1826
1827         class ImportedMethodDefinition : ImportedParameterMemberDefinition, IMethodDefinition
1828         {
1829                 public ImportedMethodDefinition (MethodBase provider, TypeSpec type, AParametersCollection parameters, MetadataImporter importer)
1830                         : base (provider, type, parameters, importer)
1831                 {
1832                 }
1833
1834                 MethodBase IMethodDefinition.Metadata {
1835                         get {
1836                                 return (MethodBase) provider;
1837                         }
1838                 }
1839         }
1840
1841         class ImportedGenericMethodDefinition : ImportedMethodDefinition, IGenericMethodDefinition
1842         {
1843                 readonly TypeParameterSpec[] tparams;
1844
1845                 public ImportedGenericMethodDefinition (MethodInfo provider, TypeSpec type, AParametersCollection parameters, TypeParameterSpec[] tparams, MetadataImporter importer)
1846                         : base (provider, type, parameters, importer)
1847                 {
1848                         this.tparams = tparams;
1849                 }
1850
1851                 #region Properties
1852
1853                 public TypeParameterSpec[] TypeParameters {
1854                         get {
1855                                 return tparams;
1856                         }
1857                 }
1858
1859                 public int TypeParametersCount {
1860                         get {
1861                                 return tparams.Length;
1862                         }
1863                 }
1864
1865                 #endregion
1866         }
1867
1868         class ImportedTypeDefinition : ImportedDefinition, ITypeDefinition
1869         {
1870                 TypeParameterSpec[] tparams;
1871                 string name;
1872
1873                 public ImportedTypeDefinition (MetaType type, MetadataImporter importer)
1874                         : base (type, importer)
1875                 {
1876                 }
1877
1878                 #region Properties
1879
1880                 public IAssemblyDefinition DeclaringAssembly {
1881                         get {
1882                                 return importer.GetAssemblyDefinition (provider.Module.Assembly);
1883                         }
1884                 }
1885
1886                 bool ITypeDefinition.IsComImport {
1887                         get {
1888                                 return ((MetaType) provider).IsImport;
1889                         }
1890                 }
1891
1892
1893                 bool ITypeDefinition.IsPartial {
1894                         get {
1895                                 return false;
1896                         }
1897                 }
1898
1899                 bool ITypeDefinition.IsTypeForwarder {
1900                         get {
1901 #if STATIC
1902                                 return ((MetaType) provider).__IsTypeForwarder;
1903 #else
1904                                 return false;
1905 #endif
1906                         }
1907                 }
1908
1909                 bool ITypeDefinition.IsCyclicTypeForwarder {
1910                         get {
1911 #if STATIC
1912                                 return ((MetaType) provider).__IsCyclicTypeForwarder;
1913 #else
1914                                 return false;
1915 #endif
1916                         }
1917                 }
1918
1919                 public override string Name {
1920                         get {
1921                                 if (name == null) {
1922                                         name = base.Name;
1923                                         if (tparams != null) {
1924                                                 int arity_start = name.IndexOf ('`');
1925                                                 if (arity_start > 0)
1926                                                         name = name.Substring (0, arity_start);
1927                                         }
1928                                 }
1929
1930                                 return name;
1931                         }
1932                 }
1933
1934                 public string Namespace {
1935                         get {
1936                                 return ((MetaType) provider).Namespace;
1937                         }
1938                 }
1939
1940                 public int TypeParametersCount {
1941                         get {
1942                                 return tparams == null ? 0 : tparams.Length;
1943                         }
1944                 }
1945
1946                 public TypeParameterSpec[] TypeParameters {
1947                         get {
1948                                 return tparams;
1949                         }
1950                         set {
1951                                 tparams = value;
1952                         }
1953                 }
1954
1955                 #endregion
1956
1957                 public void DefineInterfaces (TypeSpec spec)
1958                 {
1959                         var type = (MetaType) provider;
1960                         MetaType[] ifaces;
1961 #if STATIC
1962                         ifaces = type.__GetDeclaredInterfaces ();
1963                         if (ifaces.Length != 0) {
1964                                 foreach (var iface in ifaces) {
1965                                         var it = importer.CreateType (iface);
1966                                         if (it == null)
1967                                                 continue;
1968
1969                                         spec.AddInterfaceDefined (it);
1970
1971                                         // Unfortunately not all languages expand inherited interfaces
1972                                         var bifaces = it.Interfaces;
1973                                         if (bifaces != null) {
1974                                                 foreach (var biface in bifaces) {
1975                                                         spec.AddInterfaceDefined (biface);
1976                                                 }
1977                                         }
1978                                 }
1979                         }
1980
1981                         //
1982                         // It's impossible to get declared interfaces only using System.Reflection
1983                         // hence we need to mimic the behavior with ikvm-reflection too to keep
1984                         // our type look-up logic same
1985                         //
1986                         if (spec.BaseType != null) {
1987                                 var bifaces = spec.BaseType.Interfaces;
1988                                 if (bifaces != null) {
1989                                         //
1990                                         // Before adding base class interfaces close defined interfaces
1991                                         // on type parameter
1992                                         //
1993                                         var tp = spec as TypeParameterSpec;
1994                                         if (tp != null && tp.InterfacesDefined == null) {
1995                                                 tp.InterfacesDefined = TypeSpec.EmptyTypes;
1996                                         }
1997
1998                                         foreach (var iface in bifaces)
1999                                                 spec.AddInterfaceDefined (iface);
2000                                 }
2001                         }
2002 #else
2003                         ifaces = type.GetInterfaces ();
2004
2005                         if (ifaces.Length > 0) {
2006                                 foreach (var iface in ifaces) {
2007                                         spec.AddInterface (importer.CreateType (iface));
2008                                 }
2009                         }
2010 #endif
2011
2012                 }
2013
2014                 public static void Error_MissingDependency (IMemberContext ctx, List<MissingTypeSpecReference> missing, Location loc)
2015                 {
2016                         //
2017                         // Report details about missing type and most likely cause of the problem.
2018                         // csc used to reports 1683, 1684 (now 7069) as warnings but we report them only when used
2019                         // or referenced from the user core in which case compilation error has to
2020                         // be reported because compiler cannot continue anyway
2021                         //
2022
2023                         var report = ctx.Module.Compiler.Report;
2024
2025                         for (int i = 0; i < missing.Count; ++i) {
2026                                 var t = missing [i].Type;
2027
2028                                 //
2029                                 // Report missing types only once
2030                                 //
2031                                 if (report.Printer.MissingTypeReported (t.MemberDefinition))
2032                                         continue;
2033
2034                                 string name = t.GetSignatureForError ();
2035
2036                                 var caller = missing[i].Caller;
2037                                 if (caller.Kind != MemberKind.MissingType)
2038                                         report.SymbolRelatedToPreviousError (caller);
2039
2040                                 var definition = t.MemberDefinition;
2041                                 if (definition.DeclaringAssembly == ctx.Module.DeclaringAssembly) {
2042                                         report.Error (1683, loc,
2043                                                 "Reference to type `{0}' claims it is defined in this assembly, but it is not defined in source or any added modules",
2044                                                 name);
2045                                 } else if (definition.DeclaringAssembly.IsMissing) {
2046                                         if (definition.IsTypeForwarder) {
2047                                                 report.Error (1070, loc,
2048                                                         "The type `{0}' has been forwarded to an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
2049                                                         name, definition.DeclaringAssembly.FullName);
2050                                         } else {
2051                                                 report.Error (12, loc,
2052                                                         "The type `{0}' is defined in an assembly that is not referenced. Consider adding a reference to assembly `{1}'",
2053                                                         name, definition.DeclaringAssembly.FullName);
2054                                         }
2055                                 } else if (definition.IsTypeForwarder) {
2056                                         report.Error (731, loc, "The type forwarder for type `{0}' in assembly `{1}' has circular dependency",
2057                                                 name, definition.DeclaringAssembly.FullName);
2058                                 } else {
2059                                         report.Error (7069, loc,
2060                                                 "Reference to type `{0}' claims it is defined assembly `{1}', but it could not be found",
2061                                                 name, t.MemberDefinition.DeclaringAssembly.FullName);
2062                                 }
2063                         }
2064                 }
2065
2066                 public TypeSpec GetAttributeCoClass ()
2067                 {
2068                         if (cattrs == null)
2069                                 ReadAttributes ();
2070
2071                         return cattrs.CoClass;
2072                 }
2073
2074                 public string GetAttributeDefaultMember ()
2075                 {
2076                         if (cattrs == null)
2077                                 ReadAttributes ();
2078
2079                         return cattrs.DefaultIndexerName;
2080                 }
2081
2082                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2083                 {
2084                         if (cattrs == null)
2085                                 ReadAttributes ();
2086
2087                         return cattrs.AttributeUsage;
2088                 }
2089
2090                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2091                 {
2092                         var a = importer.GetAssemblyDefinition (provider.Module.Assembly);
2093                         return a == assembly || a.IsFriendAssemblyTo (assembly);
2094                 }
2095
2096                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2097                 {
2098                         //
2099                         // Not interested in members of nested private types unless the importer needs them
2100                         //
2101                         if (declaringType.IsPrivate && importer.IgnorePrivateMembers) {
2102                                 cache = MemberCache.Empty;
2103                                 return;
2104                         }
2105
2106                         var loading_type = (MetaType) provider;
2107                         const BindingFlags all_members = BindingFlags.DeclaredOnly |
2108                                 BindingFlags.Static | BindingFlags.Instance |
2109                                 BindingFlags.Public | BindingFlags.NonPublic;
2110
2111                         const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
2112                                         MethodAttributes.Virtual | MethodAttributes.HideBySig |
2113                                         MethodAttributes.Final;
2114
2115                         Dictionary<MethodBase, MethodSpec> possible_accessors = null;
2116                         List<EventSpec> imported_events = null;
2117                         EventSpec event_spec;
2118                         MemberSpec imported;
2119                         MethodInfo m;
2120                         MemberInfo[] all;
2121                         try {
2122                                 all = loading_type.GetMembers (all_members);
2123                         } catch (Exception e) {
2124                                 throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
2125                                         declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
2126                         }
2127
2128                         if (cache == null) {
2129                                 cache = new MemberCache (all.Length);
2130
2131                                 //
2132                                 // Do the types first as they can be referenced by the members before
2133                                 // they are found or inflated
2134                                 //
2135                                 foreach (var member in all) {
2136                                         if (member.MemberType != MemberTypes.NestedType)
2137                                                 continue;
2138
2139                                         var t = (MetaType) member;
2140
2141                                         // Ignore compiler generated types, mostly lambda containers
2142                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2143                                                 continue;
2144
2145                                         try {
2146                                                 imported = importer.CreateNestedType (t, declaringType);
2147                                         } catch (Exception e) {
2148                                                 throw new InternalErrorException (e, "Could not import nested type `{0}' from `{1}'",
2149                                                         t.FullName, declaringType.MemberDefinition.DeclaringAssembly.FullName);
2150                                         }
2151
2152                                         cache.AddMemberImported (imported);
2153                                 }
2154
2155                                 foreach (var member in all) {
2156                                         if (member.MemberType != MemberTypes.NestedType)
2157                                                 continue;
2158
2159                                         var t = (MetaType) member;
2160
2161                                         if ((t.Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate && importer.IgnorePrivateMembers)
2162                                                 continue;
2163
2164                                         importer.ImportTypeBase (t);
2165                                 }
2166                         }
2167
2168                         //
2169                         // Load base interfaces first to minic behaviour of compiled members
2170                         //
2171                         if (declaringType.IsInterface && declaringType.Interfaces != null) {
2172                                 foreach (var iface in declaringType.Interfaces) {
2173                                         cache.AddInterface (iface);
2174                                 }
2175                         }
2176
2177                         if (!onlyTypes) {
2178                                 //
2179                                 // The logic here requires methods to be returned first which seems to work for both Mono and .NET
2180                                 //
2181                                 foreach (var member in all) {
2182                                         switch (member.MemberType) {
2183                                         case MemberTypes.Constructor:
2184                                                 if (declaringType.IsInterface)
2185                                                         continue;
2186
2187                                                 goto case MemberTypes.Method;
2188                                         case MemberTypes.Method:
2189                                                 MethodBase mb = (MethodBase) member;
2190                                                 var attrs = mb.Attributes;
2191
2192                                                 if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
2193                                                         if (importer.IgnorePrivateMembers)
2194                                                                 continue;
2195
2196                                                         // Ignore explicitly implemented members
2197                                                         if ((attrs & explicit_impl) == explicit_impl)
2198                                                                 continue;
2199
2200                                                         // Ignore compiler generated methods
2201                                                         if (MetadataImporter.HasAttribute (CustomAttributeData.GetCustomAttributes (mb), "CompilerGeneratedAttribute", MetadataImporter.CompilerServicesNamespace))
2202                                                                 continue;
2203                                                 }
2204
2205                                                 imported = importer.CreateMethod (mb, declaringType);
2206                                                 if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
2207                                                         if (possible_accessors == null)
2208                                                                 possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
2209
2210                                                         // There are no metadata rules for accessors, we have to consider any method as possible candidate
2211                                                         possible_accessors.Add (mb, (MethodSpec) imported);
2212                                                 }
2213
2214                                                 break;
2215                                         case MemberTypes.Property:
2216                                                 if (possible_accessors == null)
2217                                                         continue;
2218
2219                                                 var p = (PropertyInfo) member;
2220                                                 //
2221                                                 // Links possible accessors with property
2222                                                 //
2223                                                 MethodSpec get, set;
2224                                                 m = p.GetGetMethod (true);
2225                                                 if (m == null || !possible_accessors.TryGetValue (m, out get))
2226                                                         get = null;
2227
2228                                                 m = p.GetSetMethod (true);
2229                                                 if (m == null || !possible_accessors.TryGetValue (m, out set))
2230                                                         set = null;
2231
2232                                                 // No accessors registered (e.g. explicit implementation)
2233                                                 if (get == null && set == null)
2234                                                         continue;
2235
2236                                                 try {
2237                                                         imported = importer.CreateProperty (p, declaringType, get, set);
2238                                                 } catch (Exception ex) {
2239                                                         throw new InternalErrorException (ex, "Could not import property `{0}' inside `{1}'",
2240                                                                 p.Name, declaringType.GetSignatureForError ());
2241                                                 }
2242
2243                                                 if (imported == null)
2244                                                         continue;
2245
2246                                                 break;
2247                                         case MemberTypes.Event:
2248                                                 if (possible_accessors == null)
2249                                                         continue;
2250
2251                                                 var e = (EventInfo) member;
2252                                                 //
2253                                                 // Links accessors with event
2254                                                 //
2255                                                 MethodSpec add, remove;
2256                                                 m = e.GetAddMethod (true);
2257                                                 if (m == null || !possible_accessors.TryGetValue (m, out add))
2258                                                         add = null;
2259
2260                                                 m = e.GetRemoveMethod (true);
2261                                                 if (m == null || !possible_accessors.TryGetValue (m, out remove))
2262                                                         remove = null;
2263
2264                                                 // Both accessors are required
2265                                                 if (add == null || remove == null)
2266                                                         continue;
2267
2268                                                 event_spec = importer.CreateEvent (e, declaringType, add, remove);
2269                                                 if (!importer.IgnorePrivateMembers) {
2270                                                         if (imported_events == null)
2271                                                                 imported_events = new List<EventSpec> ();
2272
2273                                                         imported_events.Add (event_spec);
2274                                                 }
2275
2276                                                 imported = event_spec;
2277                                                 break;
2278                                         case MemberTypes.Field:
2279                                                 var fi = (FieldInfo) member;
2280
2281                                                 imported = importer.CreateField (fi, declaringType);
2282                                                 if (imported == null)
2283                                                         continue;
2284
2285                                                 //
2286                                                 // For dynamic binder event has to be fully restored to allow operations
2287                                                 // within the type container to work correctly
2288                                                 //
2289                                                 if (imported_events != null) {
2290                                                         // The backing event field should be private but it may not
2291                                                         int i;
2292                                                         for (i = 0; i < imported_events.Count; ++i) {
2293                                                                 var ev = imported_events[i];
2294                                                                 if (ev.Name == fi.Name) {
2295                                                                         ev.BackingField = (FieldSpec) imported;
2296                                                                         imported_events.RemoveAt (i);
2297                                                                         i = -1;
2298                                                                         break;
2299                                                                 }
2300                                                         }
2301
2302                                                         if (i < 0)
2303                                                                 continue;
2304                                                 }
2305
2306                                                 break;
2307                                         case MemberTypes.NestedType:
2308                                                 // Already in the cache from the first pass
2309                                                 continue;
2310                                         default:
2311                                                 throw new NotImplementedException (member.ToString ());
2312                                         }
2313
2314                                         if (imported.IsStatic && declaringType.IsInterface)
2315                                                 continue;
2316
2317                                         cache.AddMemberImported (imported);
2318                                 }
2319                         }
2320                 }
2321         }
2322
2323         class ImportedTypeParameterDefinition : ImportedDefinition, ITypeDefinition
2324         {
2325                 public ImportedTypeParameterDefinition (MetaType type, MetadataImporter importer)
2326                         : base (type, importer)
2327                 {
2328                 }
2329
2330                 #region Properties
2331
2332                 public IAssemblyDefinition DeclaringAssembly {
2333                         get {
2334                                 throw new NotImplementedException ();
2335                         }
2336                 }
2337
2338                 bool ITypeDefinition.IsComImport {
2339                         get {
2340                                 return false;
2341                         }
2342                 }
2343
2344                 bool ITypeDefinition.IsPartial {
2345                         get {
2346                                 return false;
2347                         }
2348                 }
2349
2350                 bool ITypeDefinition.IsTypeForwarder {
2351                         get {
2352                                 return false;
2353                         }
2354                 }
2355
2356                 bool ITypeDefinition.IsCyclicTypeForwarder {
2357                         get {
2358                                 return false;
2359                         }
2360                 }
2361
2362                 public string Namespace {
2363                         get {
2364                                 return null;
2365                         }
2366                 }
2367
2368                 public int TypeParametersCount {
2369                         get {
2370                                 return 0;
2371                         }
2372                 }
2373
2374                 public TypeParameterSpec[] TypeParameters {
2375                         get {
2376                                 return null;
2377                         }
2378                 }
2379
2380                 #endregion
2381
2382                 public TypeSpec GetAttributeCoClass ()
2383                 {
2384                         return null;
2385                 }
2386
2387                 public string GetAttributeDefaultMember ()
2388                 {
2389                         throw new NotSupportedException ();
2390                 }
2391
2392                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
2393                 {
2394                         throw new NotSupportedException ();
2395                 }
2396
2397                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2398                 {
2399                         throw new NotImplementedException ();
2400                 }
2401
2402                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2403                 {
2404                         throw new NotImplementedException ();
2405                 }
2406         }
2407 }