mcs/mcs/assembly.cs

   1 //
   2 // assembly.cs: Assembly declaration and specifications
   3 //
   4 // Authors:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //   Marek Safar (marek.safar@gmail.com)
   7 //
   8 // Copyright 2001, 2002, 2003 Ximian, Inc.
   9 // Copyright 2004-2011 Novell, Inc.
  10 // Copyright 2011-2013 Xamarin Inc
  11 //
  12
  13
  14 using System;
  15 using System.IO;
  16 using System.Collections.Generic;
  17 using System.Globalization;
  18 using System.Security;
  19 using System.Security.Cryptography;
  20 using System.Security.Permissions;
  21 using Mono.Security.Cryptography;
  22 using Mono.CompilerServices.SymbolWriter;
  23
  24 #if STATIC
  25 using IKVM.Reflection;
  26 using IKVM.Reflection.Emit;
  27 using SecurityType = System.Collections.Generic.List<IKVM.Reflection.Emit.CustomAttributeBuilder>;
  28 #else
  29 using SecurityType = System.Collections.Generic.Dictionary<System.Security.Permissions.SecurityAction, System.Security.PermissionSet>;
  30 using System.Reflection;
  31 using System.Reflection.Emit;
  32 #endif
  33
  34 namespace Mono.CSharp
  35 {
  36         public interface IAssemblyDefinition
  37         {
  38                 string FullName { get; }
  39                 bool IsCLSCompliant { get; }
  40                 bool IsMissing { get; }
  41                 string Name { get; }
  42
  43                 byte[] GetPublicKeyToken ();
  44                 bool IsFriendAssemblyTo (IAssemblyDefinition assembly);
  45         }
  46
  47         public abstract class AssemblyDefinition : IAssemblyDefinition
  48         {
  49                 // TODO: make it private and move all builder based methods here
  50                 public AssemblyBuilder Builder;
  51                 protected AssemblyBuilderExtension builder_extra;
  52                 MonoSymbolFile symbol_writer;
  53
  54                 bool is_cls_compliant;
  55                 bool wrap_non_exception_throws;
  56                 bool wrap_non_exception_throws_custom;
  57                 bool has_user_debuggable;
  58
  59                 protected ModuleContainer module;
  60                 readonly string name;
  61                 protected readonly string file_name;
  62
  63                 byte[] public_key, public_key_token;
  64                 bool delay_sign;
  65
  66                 // Holds private/public key pair when private key
  67                 // was available
  68                 StrongNameKeyPair private_key;
  69
  70                 Attribute cls_attribute;
  71                 Method entry_point;
  72
  73                 protected List<ImportedModuleDefinition> added_modules;
  74                 SecurityType declarative_security;
  75                 Dictionary<ITypeDefinition, Attribute> emitted_forwarders;
  76                 AssemblyAttributesPlaceholder module_target_attrs;
  77
  78                 // Win32 version info values
  79                 string vi_product, vi_product_version, vi_company, vi_copyright, vi_trademark;
  80
  81                 protected AssemblyDefinition (ModuleContainer module, string name)
  82                 {
  83                         this.module = module;
  84                         this.name = Path.GetFileNameWithoutExtension (name);
  85
  86                         wrap_non_exception_throws = true;
  87
  88                         delay_sign = Compiler.Settings.StrongNameDelaySign;
  89
  90                         //
  91                         // Load strong name key early enough for assembly importer to be able to
  92                         // use the keys for InternalsVisibleTo
  93                         // This should go somewhere close to ReferencesLoading but don't have the place yet
  94                         //
  95                         if (Compiler.Settings.HasKeyFileOrContainer) {
  96                                 LoadPublicKey (Compiler.Settings.StrongNameKeyFile, Compiler.Settings.StrongNameKeyContainer);
  97                         }
  98                 }
  99
 100                 protected AssemblyDefinition (ModuleContainer module, string name, string fileName)
 101                         : this (module, name)
 102                 {
 103                         this.file_name = fileName;
 104                 }
 105
 106                 #region Properties
 107
 108                 public Attribute CLSCompliantAttribute {
 109                         get {
 110                                 return cls_attribute;
 111                         }
 112                 }
 113
 114                 public CompilerContext Compiler {
 115                         get {
 116                                 return module.Compiler;
 117                         }
 118                 }
 119
 120                 //
 121                 // Assembly entry point, aka Main method
 122                 //
 123                 public Method EntryPoint {
 124                         get {
 125                                 return entry_point;
 126                         }
 127                         set {
 128                                 entry_point = value;
 129                         }
 130                 }
 131
 132                 public string FullName {
 133                         get {
 134                                 return Builder.FullName;
 135                         }
 136                 }
 137
 138                 public bool HasCLSCompliantAttribute {
 139                         get {
 140                                 return cls_attribute != null;
 141                         }
 142                 }
 143
 144                 // TODO: This should not exist here but will require more changes
 145                 public MetadataImporter Importer {
 146                     get; set;
 147                 }
 148
 149                 public bool IsCLSCompliant {
 150                         get {
 151                                 return is_cls_compliant;
 152                         }
 153                 }
 154
 155                 bool IAssemblyDefinition.IsMissing {
 156                         get {
 157                                 return false;
 158                         }
 159                 }
 160
 161                 public bool IsSatelliteAssembly { get; private set; }
 162
 163                 public string Name {
 164                         get {
 165                                 return name;
 166                         }
 167                 }
 168
 169                 public bool WrapNonExceptionThrows {
 170                         get {
 171                                 return wrap_non_exception_throws;
 172                         }
 173                 }
 174
 175                 protected Report Report {
 176                         get {
 177                                 return Compiler.Report;
 178                         }
 179                 }
 180
 181                 public MonoSymbolFile SymbolWriter {
 182                         get {
 183                                 return symbol_writer;
 184                         }
 185                 }
 186
 187                 #endregion
 188
 189                 public void AddModule (ImportedModuleDefinition module)
 190                 {
 191                         if (added_modules == null) {
 192                                 added_modules = new List<ImportedModuleDefinition> ();
 193                                 added_modules.Add (module);
 194                         }
 195                 }
 196
 197                 public void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 198                 {
 199                         if (a.IsValidSecurityAttribute ()) {
 200                                 a.ExtractSecurityPermissionSet (ctor, ref declarative_security);
 201                                 return;
 202                         }
 203
 204                         if (a.Type == pa.AssemblyCulture) {
 205                                 string value = a.GetString ();
 206                                 if (value == null || value.Length == 0)
 207                                         return;
 208
 209                                 if (Compiler.Settings.Target == Target.Exe) {
 210                                         Report.Error (7059, a.Location, "Executables cannot be satellite assemblies. Remove the attribute or keep it empty");
 211                                         return;
 212                                 }
 213
 214                                 if (value == "neutral")
 215                                         value = "";
 216
 217                                 if (Compiler.Settings.Target == Target.Module) {
 218                                         SetCustomAttribute (ctor, cdata);
 219                                 } else {
 220                                         builder_extra.SetCulture (value, a.Location);
 221                                 }
 222
 223                                 IsSatelliteAssembly = true;
 224                                 return;
 225                         }
 226
 227                         if (a.Type == pa.AssemblyVersion) {
 228                                 string value = a.GetString ();
 229                                 if (value == null || value.Length == 0)
 230                                         return;
 231
 232                                 var vinfo = IsValidAssemblyVersion (value, true);
 233                                 if (vinfo == null) {
 234                                         Report.Error (7034, a.Location, "The specified version string `{0}' does not conform to the required format - major[.minor[.build[.revision]]]",
 235                                                 value);
 236                                         return;
 237                                 }
 238
 239                                 if (Compiler.Settings.Target == Target.Module) {
 240                                         SetCustomAttribute (ctor, cdata);
 241                                 } else {
 242                                         builder_extra.SetVersion (vinfo, a.Location);
 243                                 }
 244
 245                                 return;
 246                         }
 247
 248                         if (a.Type == pa.AssemblyAlgorithmId) {
 249                                 const int pos = 2; // skip CA header
 250                                 uint alg = (uint) cdata [pos];
 251                                 alg |= ((uint) cdata [pos + 1]) << 8;
 252                                 alg |= ((uint) cdata [pos + 2]) << 16;
 253                                 alg |= ((uint) cdata [pos + 3]) << 24;
 254
 255                                 if (Compiler.Settings.Target == Target.Module) {
 256                                         SetCustomAttribute (ctor, cdata);
 257                                 } else {
 258                                         builder_extra.SetAlgorithmId (alg, a.Location);
 259                                 }
 260
 261                                 return;
 262                         }
 263
 264                         if (a.Type == pa.AssemblyFlags) {
 265                                 const int pos = 2; // skip CA header
 266                                 uint flags = (uint) cdata[pos];
 267                                 flags |= ((uint) cdata [pos + 1]) << 8;
 268                                 flags |= ((uint) cdata [pos + 2]) << 16;
 269                                 flags |= ((uint) cdata [pos + 3]) << 24;
 270
 271                                 // Ignore set PublicKey flag if assembly is not strongnamed
 272                                 if ((flags & (uint) AssemblyNameFlags.PublicKey) != 0 && public_key == null)
 273                                         flags &= ~(uint) AssemblyNameFlags.PublicKey;
 274
 275                                 if (Compiler.Settings.Target == Target.Module) {
 276                                         SetCustomAttribute (ctor, cdata);
 277                                 } else {
 278                                         builder_extra.SetFlags (flags, a.Location);
 279                                 }
 280
 281                                 return;
 282                         }
 283
 284                         if (a.Type == pa.TypeForwarder) {
 285                                 TypeSpec t = a.GetArgumentType ();
 286                                 if (t == null || TypeManager.HasElementType (t)) {
 287                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
 288                                         return;
 289                                 }
 290
 291                                 if (emitted_forwarders == null) {
 292                                         emitted_forwarders = new Dictionary<ITypeDefinition, Attribute> ();
 293                                 } else if (emitted_forwarders.ContainsKey (t.MemberDefinition)) {
 294                                         Report.SymbolRelatedToPreviousError (emitted_forwarders[t.MemberDefinition].Location, null);
 295                                         Report.Error (739, a.Location, "A duplicate type forward of type `{0}'",
 296                                                 t.GetSignatureForError ());
 297                                         return;
 298                                 }
 299
 300                                 emitted_forwarders.Add (t.MemberDefinition, a);
 301
 302                                 if (t.MemberDefinition.DeclaringAssembly == this) {
 303                                         Report.SymbolRelatedToPreviousError (t);
 304                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
 305                                                 t.GetSignatureForError ());
 306                                         return;
 307                                 }
 308
 309                                 if (t.IsNested) {
 310                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
 311                                                 t.GetSignatureForError ());
 312                                         return;
 313                                 }
 314
 315                                 builder_extra.AddTypeForwarder (t.GetDefinition (), a.Location);
 316                                 return;
 317                         }
 318
 319                         if (a.Type == pa.Extension) {
 320                                 a.Error_MisusedExtensionAttribute ();
 321                                 return;
 322                         }
 323
 324                         if (a.Type == pa.InternalsVisibleTo) {
 325                                 string assembly_name = a.GetString ();
 326                                 if (assembly_name == null) {
 327                                         Report.Error (7030, a.Location, "Friend assembly reference cannot have `null' value");
 328                                         return;
 329                                 }
 330
 331                                 if (assembly_name.Length == 0)
 332                                         return;
 333 #if STATIC
 334                                 ParsedAssemblyName aname;
 335                                 ParseAssemblyResult r = Fusion.ParseAssemblyName (assembly_name, out aname);
 336                                 if (r != ParseAssemblyResult.OK) {
 337                                         Report.Warning (1700, 3, a.Location, "Friend assembly reference `{0}' is invalid and cannot be resolved",
 338                                                 assembly_name);
 339                                         return;
 340                                 }
 341
 342                                 if (aname.Version != null || aname.Culture != null || aname.ProcessorArchitecture != ProcessorArchitecture.None) {
 343                                         Report.Error (1725, a.Location,
 344                                                 "Friend assembly reference `{0}' is invalid. InternalsVisibleTo declarations cannot have a version, culture or processor architecture specified",
 345                                                 assembly_name);
 346
 347                                         return;
 348                                 }
 349
 350                                 if (public_key != null && !aname.HasPublicKey) {
 351                                         Report.Error (1726, a.Location,
 352                                                 "Friend assembly reference `{0}' is invalid. Strong named assemblies must specify a public key in their InternalsVisibleTo declarations",
 353                                                 assembly_name);
 354                                         return;
 355                                 }
 356 #endif
 357                         } else if (a.Type == pa.RuntimeCompatibility) {
 358                                 wrap_non_exception_throws_custom = true;
 359                         } else if (a.Type == pa.AssemblyFileVersion) {
 360                                 vi_product_version = a.GetString ();
 361                                 if (string.IsNullOrEmpty (vi_product_version) || IsValidAssemblyVersion (vi_product_version, false) == null) {
 362                                         Report.Warning (7035, 1, a.Location, "The specified version string `{0}' does not conform to the recommended format major.minor.build.revision",
 363                                                 vi_product_version, a.Name);
 364                                         return;
 365                                 }
 366
 367                                 // File version info decoding from blob is not supported
 368                                 var cab = new CustomAttributeBuilder ((ConstructorInfo) ctor.GetMetaInfo (), new object[] { vi_product_version });
 369                                 Builder.SetCustomAttribute (cab);
 370                                 return;
 371                         } else if (a.Type == pa.AssemblyProduct) {
 372                                 vi_product = a.GetString ();
 373                         } else if (a.Type == pa.AssemblyCompany) {
 374                                 vi_company = a.GetString ();
 375                         } else if (a.Type == pa.AssemblyCopyright) {
 376                                 vi_copyright = a.GetString ();
 377                         } else if (a.Type == pa.AssemblyTrademark) {
 378                                 vi_trademark = a.GetString ();
 379                         } else if (a.Type == pa.Debuggable) {
 380                                 has_user_debuggable = true;
 381                         }
 382
 383                         //
 384                         // Win32 version info attributes AssemblyDescription and AssemblyTitle cannot be
 385                         // set using public API and because we have blob like attributes we need to use
 386                         // special option DecodeVersionInfoAttributeBlobs to support values extraction
 387                         //
 388
 389                         SetCustomAttribute (ctor, cdata);
 390                 }
 391
 392                 //
 393                 // When using assembly public key attributes InternalsVisibleTo key
 394                 // was not checked, we have to do it later when we actually know what
 395                 // our public key token is
 396                 //
 397                 void CheckReferencesPublicToken ()
 398                 {
 399                         foreach (var an in builder_extra.GetReferencedAssemblies ()) {
 400                                 if (public_key != null && an.GetPublicKey ().Length == 0) {
 401                                         Report.Error (1577, "Referenced assembly `{0}' does not have a strong name",
 402                                                 an.FullName);
 403                                 }
 404
 405                                 var ci = an.CultureInfo;
 406                                 if (!ci.Equals (CultureInfo.InvariantCulture)) {
 407                                         Report.Warning (8009, 1, "Referenced assembly `{0}' has different culture setting of `{1}'",
 408                                                 an.Name, ci.Name);
 409                                 }
 410
 411                                 var ia = Importer.GetImportedAssemblyDefinition (an);
 412                                 if (ia == null)
 413                                         continue;
 414
 415                                 var references = GetNotUnifiedReferences (an);
 416                                 if (references != null) {
 417                                         foreach (var r in references) {
 418                                                 Report.SymbolRelatedToPreviousError ( r[0]);
 419                                                 Report.Error (1705, r [1]);
 420                                         }
 421                                 }
 422
 423                                 if (!ia.IsFriendAssemblyTo (this))
 424                                         continue;
 425
 426                                 var attr = ia.GetAssemblyVisibleToName (this);
 427                                 var atoken = attr.GetPublicKeyToken ();
 428
 429                                 if (ArrayComparer.IsEqual (GetPublicKeyToken (), atoken))
 430                                         continue;
 431
 432                                 Report.SymbolRelatedToPreviousError (ia.Location);
 433                                 Report.Error (281,
 434                                         "Friend access was granted to `{0}', but the output assembly is named `{1}'. Try adding a reference to `{0}' or change the output assembly name to match it",
 435                                         attr.FullName, FullName);
 436                         }
 437                 }
 438
 439                 protected AssemblyName CreateAssemblyName ()
 440                 {
 441                         var an = new AssemblyName (name);
 442
 443                         if (public_key != null && Compiler.Settings.Target != Target.Module) {
 444                                 if (delay_sign) {
 445                                         an.SetPublicKey (public_key);
 446                                 } else {
 447                                         if (public_key.Length == 16) {
 448                                                 Report.Error (1606, "Could not sign the assembly. ECMA key can only be used to delay-sign assemblies");
 449                                         } else if (private_key == null) {
 450                                                 Error_AssemblySigning ("The specified key file does not have a private key");
 451                                         } else {
 452                                                 an.KeyPair = private_key;
 453                                         }
 454                                 }
 455                         }
 456
 457                         return an;
 458                 }
 459
 460                 public virtual ModuleBuilder CreateModuleBuilder ()
 461                 {
 462                         if (file_name == null)
 463                                 throw new NotSupportedException ("transient module in static assembly");
 464
 465                         var module_name = Path.GetFileName (file_name);
 466
 467                         // Always initialize module without symbolInfo. We could be framework dependent
 468                         // but returned ISymbolWriter does not have all what we need therefore some
 469                         // adaptor will be needed for now we alwayas emit MDB format when generating
 470                         // debug info
 471                         return Builder.DefineDynamicModule (module_name, module_name, false);
 472                 }
 473
 474                 public virtual void Emit ()
 475                 {
 476                         if (Compiler.Settings.Target == Target.Module) {
 477                                 module_target_attrs = new AssemblyAttributesPlaceholder (module, name);
 478                                 module_target_attrs.CreateContainer ();
 479                                 module_target_attrs.DefineContainer ();
 480                                 module_target_attrs.Define ();
 481                                 module.AddCompilerGeneratedClass (module_target_attrs);
 482                         } else if (added_modules != null) {
 483                                 ReadModulesAssemblyAttributes ();
 484                         }
 485
 486                         if (Compiler.Settings.GenerateDebugInfo) {
 487                                 symbol_writer = new MonoSymbolFile ();
 488                         }
 489
 490                         module.EmitContainer ();
 491
 492                         if (module.HasExtensionMethod) {
 493                                 var pa = module.PredefinedAttributes.Extension;
 494                                 if (pa.IsDefined) {
 495                                         SetCustomAttribute (pa.Constructor, AttributeEncoder.Empty);
 496                                 }
 497                         }
 498
 499                         if (!IsSatelliteAssembly) {
 500                                 if (!has_user_debuggable && Compiler.Settings.GenerateDebugInfo) {
 501                                         var pa = module.PredefinedAttributes.Debuggable;
 502                                         if (pa.IsDefined) {
 503                                                 var modes = System.Diagnostics.DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints;
 504                                                 if (!Compiler.Settings.Optimize)
 505                                                         modes |= System.Diagnostics.DebuggableAttribute.DebuggingModes.DisableOptimizations;
 506
 507                                                 pa.EmitAttribute (Builder, modes);
 508                                         }
 509                                 }
 510
 511                                 if (!wrap_non_exception_throws_custom) {
 512                                         PredefinedAttribute pa = module.PredefinedAttributes.RuntimeCompatibility;
 513                                         if (pa.IsDefined && pa.ResolveBuilder ()) {
 514                                                 var prop = module.PredefinedMembers.RuntimeCompatibilityWrapNonExceptionThrows.Get ();
 515                                                 if (prop != null) {
 516                                                         AttributeEncoder encoder = new AttributeEncoder ();
 517                                                         encoder.EncodeNamedPropertyArgument (prop, new BoolLiteral (Compiler.BuiltinTypes, true, Location.Null));
 518                                                         SetCustomAttribute (pa.Constructor, encoder.ToArray ());
 519                                                 }
 520                                         }
 521                                 }
 522
 523                                 if (declarative_security != null) {
 524 #if STATIC
 525                                         foreach (var entry in declarative_security) {
 526                                                 Builder.__AddDeclarativeSecurity (entry);
 527                                         }
 528 #else
 529                                         throw new NotSupportedException ("Assembly-level security");
 530 #endif
 531                                 }
 532                         }
 533
 534                         CheckReferencesPublicToken ();
 535
 536                         SetEntryPoint ();
 537                 }
 538
 539                 public byte[] GetPublicKeyToken ()
 540                 {
 541                         if (public_key == null || public_key_token != null)
 542                                 return public_key_token;
 543
 544                         HashAlgorithm ha = SHA1.Create ();
 545                         byte[] hash = ha.ComputeHash (public_key);
 546                         // we need the last 8 bytes in reverse order
 547                         public_key_token = new byte[8];
 548                         Buffer.BlockCopy (hash, hash.Length - 8, public_key_token, 0, 8);
 549                         Array.Reverse (public_key_token, 0, 8);
 550                         return public_key_token;
 551                 }
 552
 553                 protected virtual List<string[]> GetNotUnifiedReferences (AssemblyName assemblyName)
 554                 {
 555                         return null;
 556                 }
 557
 558                 //
 559                 // Either keyFile or keyContainer has to be non-null
 560                 //
 561                 void LoadPublicKey (string keyFile, string keyContainer)
 562                 {
 563                         if (keyContainer != null) {
 564                                 try {
 565                                         private_key = new StrongNameKeyPair (keyContainer);
 566                                         public_key = private_key.PublicKey;
 567                                 } catch {
 568                                         Error_AssemblySigning ("The specified key container `" + keyContainer + "' does not exist");
 569                                 }
 570
 571                                 return;
 572                         }
 573
 574                         bool key_file_exists = File.Exists (keyFile);
 575
 576                         //
 577                         // For attribute based KeyFile do additional lookup
 578                         // in output assembly path
 579                         //
 580                         if (!key_file_exists && Compiler.Settings.StrongNameKeyFile == null) {
 581                                 //
 582                                 // The key file can be relative to output assembly
 583                                 //
 584                                 string test_path = Path.Combine (Path.GetDirectoryName (file_name), keyFile);
 585                                 key_file_exists = File.Exists (test_path);
 586                                 if (key_file_exists)
 587                                         keyFile = test_path;
 588                         }
 589
 590                         if (!key_file_exists) {
 591                                 Error_AssemblySigning ("The specified key file `" + keyFile + "' does not exist");
 592                                 return;
 593                         }
 594
 595                         using (FileStream fs = new FileStream (keyFile, FileMode.Open, FileAccess.Read)) {
 596                                 byte[] snkeypair = new byte[fs.Length];
 597                                 fs.Read (snkeypair, 0, snkeypair.Length);
 598
 599                                 // check for ECMA key
 600                                 if (snkeypair.Length == 16) {
 601                                         public_key = snkeypair;
 602                                         return;
 603                                 }
 604
 605                                 try {
 606                                         // take it, with or without, a private key
 607                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (snkeypair);
 608                                         // and make sure we only feed the public part to Sys.Ref
 609                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
 610
 611                                         // AssemblyName.SetPublicKey requires an additional header
 612                                         byte[] publicKeyHeader = new byte[8] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00 };
 613
 614                                         // Encode public key
 615                                         public_key = new byte[12 + publickey.Length];
 616                                         Buffer.BlockCopy (publicKeyHeader, 0, public_key, 0, publicKeyHeader.Length);
 617
 618                                         // Length of Public Key (in bytes)
 619                                         int lastPart = public_key.Length - 12;
 620                                         public_key[8] = (byte) (lastPart & 0xFF);
 621                                         public_key[9] = (byte) ((lastPart >> 8) & 0xFF);
 622                                         public_key[10] = (byte) ((lastPart >> 16) & 0xFF);
 623                                         public_key[11] = (byte) ((lastPart >> 24) & 0xFF);
 624
 625                                         Buffer.BlockCopy (publickey, 0, public_key, 12, publickey.Length);
 626                                 } catch {
 627                                         Error_AssemblySigning ("The specified key file `" + keyFile + "' has incorrect format");
 628                                         return;
 629                                 }
 630
 631                                 if (delay_sign)
 632                                         return;
 633
 634                                 try {
 635                                         // TODO: Is there better way to test for a private key presence ?
 636                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
 637                                         private_key = new StrongNameKeyPair (snkeypair);
 638                                 } catch { }
 639                         }
 640                 }
 641
 642                 void ReadModulesAssemblyAttributes ()
 643                 {
 644                         foreach (var m in added_modules) {
 645                                 var cattrs = m.ReadAssemblyAttributes ();
 646                                 if (cattrs == null)
 647                                         continue;
 648
 649                                 module.OptAttributes.AddAttributes (cattrs);
 650                         }
 651                 }
 652
 653                 public void Resolve ()
 654                 {
 655                         if (Compiler.Settings.Unsafe && module.PredefinedTypes.SecurityAction.Define ()) {
 656                                 //
 657                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
 658                                 // when -unsafe option was specified
 659                                 //
 660                                 Location loc = Location.Null;
 661
 662                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
 663                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
 664
 665                                 var req_min = module.PredefinedMembers.SecurityActionRequestMinimum.Resolve (loc);
 666
 667                                 Arguments pos = new Arguments (1);
 668                                 pos.Add (new Argument (req_min.GetConstant (null)));
 669
 670                                 Arguments named = new Arguments (1);
 671                                 named.Add (new NamedArgument ("SkipVerification", loc, new BoolLiteral (Compiler.BuiltinTypes, true, loc)));
 672
 673                                 Attribute g = new Attribute ("assembly",
 674                                         new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
 675                                         new Arguments[] { pos, named }, loc, false);
 676                                 g.AttachTo (module, module);
 677
 678                                 // Disable no-location warnings (e.g. obsolete) for compiler generated attribute
 679                                 Compiler.Report.DisableReporting ();
 680                                 try {
 681                                         var ctor = g.Resolve ();
 682                                         if (ctor != null) {
 683                                                 g.ExtractSecurityPermissionSet (ctor, ref declarative_security);
 684                                         }
 685                                 } finally {
 686                                         Compiler.Report.EnableReporting ();
 687                                 }
 688                         }
 689
 690                         if (module.OptAttributes == null)
 691                                 return;
 692
 693                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
 694                         if (!module.OptAttributes.CheckTargets())
 695                                 return;
 696
 697                         cls_attribute = module.ResolveAssemblyAttribute (module.PredefinedAttributes.CLSCompliant);
 698
 699                         if (cls_attribute != null) {
 700                                 is_cls_compliant = cls_attribute.GetClsCompliantAttributeValue ();
 701                         }
 702
 703                         if (added_modules != null && Compiler.Settings.VerifyClsCompliance && is_cls_compliant) {
 704                                 foreach (var m in added_modules) {
 705                                         if (!m.IsCLSCompliant) {
 706                                                 Report.Error (3013,
 707                                                         "Added modules must be marked with the CLSCompliant attribute to match the assembly",
 708                                                         m.Name);
 709                                         }
 710                                 }
 711                         }
 712
 713                         Attribute a = module.ResolveAssemblyAttribute (module.PredefinedAttributes.RuntimeCompatibility);
 714                         if (a != null) {
 715                                 var val = a.GetNamedValue ("WrapNonExceptionThrows") as BoolConstant;
 716                                 if (val != null)
 717                                         wrap_non_exception_throws = val.Value;
 718                         }
 719                 }
 720
 721                 protected void ResolveAssemblySecurityAttributes ()
 722                 {
 723                         string key_file = null;
 724                         string key_container = null;
 725
 726                         if (module.OptAttributes != null) {
 727                                 foreach (Attribute a in module.OptAttributes.Attrs) {
 728                                         // cannot rely on any resolve-based members before you call Resolve
 729                                         if (a.ExplicitTarget != "assembly")
 730                                                 continue;
 731
 732                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
 733                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
 734                                         //       are loaded yet.
 735                                         // TODO: Does not handle quoted attributes properly
 736                                         switch (a.Name) {
 737                                         case "AssemblyKeyFile":
 738                                         case "AssemblyKeyFileAttribute":
 739                                         case "System.Reflection.AssemblyKeyFileAttribute":
 740                                                 if (Compiler.Settings.StrongNameKeyFile != null) {
 741                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 742                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 743                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
 744                                                 } else {
 745                                                         string value = a.GetString ();
 746                                                         if (!string.IsNullOrEmpty (value)) {
 747                                                                 Error_ObsoleteSecurityAttribute (a, "keyfile");
 748                                                                 key_file = value;
 749                                                         }
 750                                                 }
 751                                                 break;
 752                                         case "AssemblyKeyName":
 753                                         case "AssemblyKeyNameAttribute":
 754                                         case "System.Reflection.AssemblyKeyNameAttribute":
 755                                                 if (Compiler.Settings.StrongNameKeyContainer != null) {
 756                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 757                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 758                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
 759                                                 } else {
 760                                                         string value = a.GetString ();
 761                                                         if (!string.IsNullOrEmpty (value)) {
 762                                                                 Error_ObsoleteSecurityAttribute (a, "keycontainer");
 763                                                                 key_container = value;
 764                                                         }
 765                                                 }
 766                                                 break;
 767                                         case "AssemblyDelaySign":
 768                                         case "AssemblyDelaySignAttribute":
 769                                         case "System.Reflection.AssemblyDelaySignAttribute":
 770                                                 bool b = a.GetBoolean ();
 771                                                 if (b) {
 772                                                         Error_ObsoleteSecurityAttribute (a, "delaysign");
 773                                                 }
 774
 775                                                 delay_sign = b;
 776                                                 break;
 777                                         }
 778                                 }
 779                         }
 780
 781                         // We came here only to report assembly attributes warnings
 782                         if (public_key != null)
 783                                 return;
 784
 785                         //
 786                         // Load the strong key file found in attributes when no
 787                         // command line key was given
 788                         //
 789                         if (key_file != null || key_container != null) {
 790                                 LoadPublicKey (key_file, key_container);
 791                         } else if (delay_sign) {
 792                                 Report.Warning (1607, 1, "Delay signing was requested but no key file was given");
 793                         }
 794                 }
 795
 796                 public void EmbedResources ()
 797                 {
 798                         //
 799                         // Add Win32 resources
 800                         //
 801                         if (Compiler.Settings.Win32ResourceFile != null) {
 802                                 Builder.DefineUnmanagedResource (Compiler.Settings.Win32ResourceFile);
 803                         } else {
 804                                 Builder.DefineVersionInfoResource (vi_product, vi_product_version, vi_company, vi_copyright, vi_trademark);
 805                         }
 806
 807                         if (Compiler.Settings.Win32IconFile != null) {
 808                                 builder_extra.DefineWin32IconResource (Compiler.Settings.Win32IconFile);
 809                         }
 810
 811                         if (Compiler.Settings.Resources != null) {
 812                                 if (Compiler.Settings.Target == Target.Module) {
 813                                         Report.Error (1507, "Cannot link resource file when building a module");
 814                                 } else {
 815                                         int counter = 0;
 816                                         foreach (var res in Compiler.Settings.Resources) {
 817                                                 if (!File.Exists (res.FileName)) {
 818                                                         Report.Error (1566, "Error reading resource file `{0}'", res.FileName);
 819                                                         continue;
 820                                                 }
 821
 822                                                 if (res.IsEmbeded) {
 823                                                         Stream stream;
 824                                                         if (counter++ < 10) {
 825                                                                 stream = File.OpenRead (res.FileName);
 826                                                         } else {
 827                                                                 // TODO: SRE API requires resource stream to be available during AssemblyBuilder::Save
 828                                                                 // we workaround it by reading everything into memory to compile projects with
 829                                                                 // many embedded resource (over 3500) references
 830                                                                 stream = new MemoryStream (File.ReadAllBytes (res.FileName));
 831                                                         }
 832
 833                                                         module.Builder.DefineManifestResource (res.Name, stream, res.Attributes);
 834                                                 } else {
 835                                                         Builder.AddResourceFile (res.Name, Path.GetFileName (res.FileName), res.Attributes);
 836                                                 }
 837                                         }
 838                                 }
 839                         }
 840                 }
 841
 842                 public void Save ()
 843                 {
 844                         PortableExecutableKinds pekind = PortableExecutableKinds.ILOnly;
 845                         ImageFileMachine machine;
 846
 847                         switch (Compiler.Settings.Platform) {
 848                         case Platform.X86:
 849                                 pekind |= PortableExecutableKinds.Required32Bit;
 850                                 machine = ImageFileMachine.I386;
 851                                 break;
 852                         case Platform.X64:
 853                                 pekind |= PortableExecutableKinds.PE32Plus;
 854                                 machine = ImageFileMachine.AMD64;
 855                                 break;
 856                         case Platform.IA64:
 857                                 machine = ImageFileMachine.IA64;
 858                                 break;
 859                         case Platform.AnyCPU32Preferred:
 860 #if STATIC
 861                                 pekind |= PortableExecutableKinds.Preferred32Bit;
 862                                 machine = ImageFileMachine.I386;
 863                                 break;
 864 #else
 865                                 throw new NotSupportedException ();
 866 #endif
 867                         case Platform.Arm:
 868 #if STATIC
 869                                 machine = ImageFileMachine.ARM;
 870                                 break;
 871 #else
 872                                 throw new NotSupportedException ();
 873 #endif
 874                         case Platform.AnyCPU:
 875                         default:
 876                                 machine = ImageFileMachine.I386;
 877                                 break;
 878                         }
 879
 880                         Compiler.TimeReporter.Start (TimeReporter.TimerType.OutputSave);
 881                         try {
 882                                 if (Compiler.Settings.Target == Target.Module) {
 883                                         SaveModule (pekind, machine);
 884                                 } else {
 885                                         Builder.Save (module.Builder.ScopeName, pekind, machine);
 886                                 }
 887                         } catch (ArgumentOutOfRangeException) {
 888                                 Report.Error (16, "Output file `{0}' exceeds the 4GB limit");
 889                         } catch (Exception e) {
 890                                 Report.Error (16, "Could not write to file `{0}'. {1}", name, e.Message);
 891                         }
 892                         Compiler.TimeReporter.Stop (TimeReporter.TimerType.OutputSave);
 893
 894                         // Save debug symbols file
 895                         if (symbol_writer != null && Compiler.Report.Errors == 0) {
 896                                 // TODO: it should run in parallel
 897                                 Compiler.TimeReporter.Start (TimeReporter.TimerType.DebugSave);
 898
 899                                 var filename = file_name + ".mdb";
 900                                 try {
 901                                         // We mmap the file, so unlink the previous version since it may be in use
 902                                         File.Delete (filename);
 903                                 } catch {
 904                                         // We can safely ignore
 905                                 }
 906
 907                                 module.WriteDebugSymbol (symbol_writer);
 908
 909                                 using (FileStream fs = new FileStream (filename, FileMode.Create, FileAccess.Write)) {
 910                                         symbol_writer.CreateSymbolFile (module.Builder.ModuleVersionId, fs);
 911                                 }
 912
 913                                 Compiler.TimeReporter.Stop (TimeReporter.TimerType.DebugSave);
 914                         }
 915                 }
 916
 917                 protected virtual void SaveModule (PortableExecutableKinds pekind, ImageFileMachine machine)
 918                 {
 919                         Report.RuntimeMissingSupport (Location.Null, "-target:module");
 920                 }
 921
 922                 void SetCustomAttribute (MethodSpec ctor, byte[] data)
 923                 {
 924                         if (module_target_attrs != null)
 925                                 module_target_attrs.AddAssemblyAttribute (ctor, data);
 926                         else
 927                                 Builder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), data);
 928                 }
 929
 930                 void SetEntryPoint ()
 931                 {
 932                         if (!Compiler.Settings.NeedsEntryPoint) {
 933                                 if (Compiler.Settings.MainClass != null)
 934                                         Report.Error (2017, "Cannot specify -main if building a module or library");
 935
 936                                 return;
 937                         }
 938
 939                         PEFileKinds file_kind;
 940
 941                         switch (Compiler.Settings.Target) {
 942                         case Target.Library:
 943                         case Target.Module:
 944                                 file_kind = PEFileKinds.Dll;
 945                                 break;
 946                         case Target.WinExe:
 947                                 file_kind = PEFileKinds.WindowApplication;
 948                                 break;
 949                         default:
 950                                 file_kind = PEFileKinds.ConsoleApplication;
 951                                 break;
 952                         }
 953
 954                         if (entry_point == null) {
 955                                 string main_class = Compiler.Settings.MainClass;
 956                                 if (main_class != null) {
 957                                         // TODO: Handle dotted names
 958                                         var texpr = module.GlobalRootNamespace.LookupType (module, main_class, 0, LookupMode.Probing, Location.Null);
 959                                         if (texpr == null) {
 960                                                 Report.Error (1555, "Could not find `{0}' specified for Main method", main_class);
 961                                                 return;
 962                                         }
 963
 964                                         var mtype = texpr.MemberDefinition as ClassOrStruct;
 965                                         if (mtype == null) {
 966                                                 Report.Error (1556, "`{0}' specified for Main method must be a valid class or struct", main_class);
 967                                                 return;
 968                                         }
 969
 970                                         Report.Error (1558, mtype.Location, "`{0}' does not have a suitable static Main method", mtype.GetSignatureForError ());
 971                                 } else {
 972                                         string pname = file_name == null ? name : Path.GetFileName (file_name);
 973                                         Report.Error (5001, "Program `{0}' does not contain a static `Main' method suitable for an entry point",
 974                                                 pname);
 975                                 }
 976
 977                                 return;
 978                         }
 979
 980                         Builder.SetEntryPoint (entry_point.MethodBuilder, file_kind);
 981                 }
 982
 983                 void Error_ObsoleteSecurityAttribute (Attribute a, string option)
 984                 {
 985                         Report.Warning (1699, 1, a.Location,
 986                                 "Use compiler option `{0}' or appropriate project settings instead of `{1}' attribute",
 987                                 option, a.Name);
 988                 }
 989
 990                 void Error_AssemblySigning (string text)
 991                 {
 992                         Report.Error (1548, "Error during assembly signing. " + text);
 993                 }
 994
 995                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
 996                 {
 997                         return false;
 998                 }
 999
1000                 static Version IsValidAssemblyVersion (string version, bool allowGenerated)
1001                 {
1002                         string[] parts = version.Split ('.');
1003                         if (parts.Length < 1 || parts.Length > 4)
1004                                 return null;
1005
1006                         var values = new int[4];
1007                         for (int i = 0; i < parts.Length; ++i) {
1008                                 if (!int.TryParse (parts[i], out values[i])) {
1009                                         if (parts[i].Length == 1 && parts[i][0] == '*' && allowGenerated) {
1010                                                 if (i == 2) {
1011                                                         // Nothing can follow *
1012                                                         if (parts.Length > 3)
1013                                                                 return null;
1014
1015                                                         // Generate Build value based on days since 1/1/2000
1016                                                         TimeSpan days = DateTime.Today - new DateTime (2000, 1, 1);
1017                                                         values[i] = System.Math.Max (days.Days, 0);
1018                                                         i = 3;
1019                                                 }
1020
1021                                                 if (i == 3) {
1022                                                         // Generate Revision value based on every other second today
1023                                                         var seconds = DateTime.Now - DateTime.Today;
1024                                                         values[i] = (int) seconds.TotalSeconds / 2;
1025                                                         continue;
1026                                                 }
1027                                         }
1028
1029                                         return null;
1030                                 }
1031
1032                                 if (values[i] > ushort.MaxValue)
1033                                         return null;
1034                         }
1035
1036                         return new Version (values[0], values[1], values[2], values[3]);
1037                 }
1038         }
1039
1040         public class AssemblyResource : IEquatable<AssemblyResource>
1041         {
1042                 public AssemblyResource (string fileName, string name)
1043                         : this (fileName, name, false)
1044                 {
1045                 }
1046
1047                 public AssemblyResource (string fileName, string name, bool isPrivate)
1048                 {
1049                         FileName = fileName;
1050                         Name = name;
1051                         Attributes = isPrivate ? ResourceAttributes.Private : ResourceAttributes.Public;
1052                 }
1053
1054                 public ResourceAttributes Attributes { get; private set; }
1055                 public string Name { get; private set; }
1056                 public string FileName { get; private set; }
1057                 public bool IsEmbeded { get; set; }
1058
1059                 #region IEquatable<AssemblyResource> Members
1060
1061                 public bool Equals (AssemblyResource other)
1062                 {
1063                         return Name == other.Name;
1064                 }
1065
1066                 #endregion
1067         }
1068
1069         //
1070         // A placeholder class for assembly attributes when emitting module
1071         //
1072         class AssemblyAttributesPlaceholder : CompilerGeneratedContainer
1073         {
1074                 static readonly string TypeNamePrefix = "<$AssemblyAttributes${0}>";
1075                 public static readonly string AssemblyFieldName = "attributes";
1076
1077                 Field assembly;
1078
1079                 public AssemblyAttributesPlaceholder (ModuleContainer parent, string outputName)
1080                         : base (parent, new MemberName (GetGeneratedName (outputName)), Modifiers.STATIC | Modifiers.INTERNAL)
1081                 {
1082                         assembly = new Field (this, new TypeExpression (parent.Compiler.BuiltinTypes.Object, Location), Modifiers.PUBLIC | Modifiers.STATIC,
1083                                 new MemberName (AssemblyFieldName), null);
1084
1085                         AddField (assembly);
1086                 }
1087
1088                 public void AddAssemblyAttribute (MethodSpec ctor, byte[] data)
1089                 {
1090                         assembly.SetCustomAttribute (ctor, data);
1091                 }
1092
1093                 public static string GetGeneratedName (string outputName)
1094                 {
1095                         return string.Format (TypeNamePrefix, outputName);
1096                 }
1097         }
1098
1099         //
1100         // Extension to System.Reflection.Emit.AssemblyBuilder to have fully compatible
1101         // compiler. This is a default implementation for framework System.Reflection.Emit
1102         // which does not implement any of the methods
1103         //
1104         public class AssemblyBuilderExtension
1105         {
1106                 protected readonly CompilerContext ctx;
1107
1108                 public AssemblyBuilderExtension (CompilerContext ctx)
1109                 {
1110                         this.ctx = ctx;
1111                 }
1112
1113                 public virtual System.Reflection.Module AddModule (string module)
1114                 {
1115                         ctx.Report.RuntimeMissingSupport (Location.Null, "-addmodule");
1116                         return null;
1117                 }
1118
1119                 public virtual void AddPermissionRequests (PermissionSet[] permissions)
1120                 {
1121                         ctx.Report.RuntimeMissingSupport (Location.Null, "assembly declarative security");
1122                 }
1123
1124                 public virtual void AddTypeForwarder (TypeSpec type, Location loc)
1125                 {
1126                         ctx.Report.RuntimeMissingSupport (loc, "TypeForwardedToAttribute");
1127                 }
1128
1129                 public virtual void DefineWin32IconResource (string fileName)
1130                 {
1131                         ctx.Report.RuntimeMissingSupport (Location.Null, "-win32icon");
1132                 }
1133
1134                 public virtual AssemblyName[] GetReferencedAssemblies ()
1135                 {
1136                         return null;
1137                 }
1138
1139                 public virtual void SetAlgorithmId (uint value, Location loc)
1140                 {
1141                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyAlgorithmIdAttribute");
1142                 }
1143
1144                 public virtual void SetCulture (string culture, Location loc)
1145                 {
1146                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyCultureAttribute");
1147                 }
1148
1149                 public virtual void SetFlags (uint flags, Location loc)
1150                 {
1151                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyFlagsAttribute");
1152                 }
1153
1154                 public virtual void SetVersion (Version version, Location loc)
1155                 {
1156                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyVersionAttribute");
1157                 }
1158         }
1159
1160         abstract class AssemblyReferencesLoader<T> where T : class
1161         {
1162                 protected readonly CompilerContext compiler;
1163
1164                 protected readonly List<string> paths;
1165
1166                 protected AssemblyReferencesLoader (CompilerContext compiler)
1167                 {
1168                         this.compiler = compiler;
1169
1170                         paths = new List<string> ();
1171                         paths.Add (Directory.GetCurrentDirectory ());
1172                         paths.AddRange (compiler.Settings.ReferencesLookupPaths);
1173                 }
1174
1175                 public abstract bool HasObjectType (T assembly);
1176                 protected abstract string[] GetDefaultReferences ();
1177                 public abstract T LoadAssemblyFile (string fileName, bool isImplicitReference);
1178                 public abstract void LoadReferences (ModuleContainer module);
1179
1180                 protected void Error_FileNotFound (string fileName)
1181                 {
1182                         compiler.Report.Error (6, "Metadata file `{0}' could not be found", fileName);
1183                 }
1184
1185                 protected void Error_FileCorrupted (string fileName)
1186                 {
1187                         compiler.Report.Error (9, "Metadata file `{0}' does not contain valid metadata", fileName);
1188                 }
1189
1190                 protected void Error_AssemblyIsModule (string fileName)
1191                 {
1192                         compiler.Report.Error (1509,
1193                                 "Referenced assembly file `{0}' is a module. Consider using `-addmodule' option to add the module",
1194                                 fileName);
1195                 }
1196
1197                 protected void Error_ModuleIsAssembly (string fileName)
1198                 {
1199                         compiler.Report.Error (1542,
1200                                 "Added module file `{0}' is an assembly. Consider using `-r' option to reference the file",
1201                                 fileName);
1202                 }
1203
1204                 protected void LoadReferencesCore (ModuleContainer module, out T corlib_assembly, out List<Tuple<RootNamespace, T>> loaded)
1205                 {
1206                         compiler.TimeReporter.Start (TimeReporter.TimerType.ReferencesLoading);
1207
1208                         loaded = new List<Tuple<RootNamespace, T>> ();
1209
1210                         //
1211                         // Load mscorlib.dll as the first
1212                         //
1213                         if (module.Compiler.Settings.StdLib) {
1214                                 corlib_assembly = LoadAssemblyFile ("mscorlib.dll", true);
1215                         } else {
1216                                 corlib_assembly = default (T);
1217                         }
1218
1219                         T a;
1220                         foreach (string r in module.Compiler.Settings.AssemblyReferences) {
1221                                 a = LoadAssemblyFile (r, false);
1222                                 if (a == null || EqualityComparer<T>.Default.Equals (a, corlib_assembly))
1223                                         continue;
1224
1225                                 var key = Tuple.Create (module.GlobalRootNamespace, a);
1226                                 if (loaded.Contains (key))
1227                                         continue;
1228
1229                                 loaded.Add (key);
1230                         }
1231
1232                         if (corlib_assembly == null) {
1233                                 //
1234                                 // Requires second pass because HasObjectType can trigger assembly load event
1235                                 //
1236                                 for (int i = 0; i < loaded.Count; ++i) {
1237                                         var assembly = loaded [i];
1238
1239                                         //
1240                                         // corlib assembly is the first referenced assembly which contains System.Object
1241                                         //
1242                                         if (HasObjectType (assembly.Item2)) {
1243                                                 corlib_assembly = assembly.Item2;
1244                                                 loaded.RemoveAt (i);
1245                                                 break;
1246                                         }
1247                                 }
1248                         }
1249
1250                         foreach (var entry in module.Compiler.Settings.AssemblyReferencesAliases) {
1251                                 a = LoadAssemblyFile (entry.Item2, false);
1252                                 if (a == null)
1253                                         continue;
1254
1255                                 var key = Tuple.Create (module.CreateRootNamespace (entry.Item1), a);
1256                                 if (loaded.Contains (key))
1257                                         continue;
1258
1259                                 loaded.Add (key);
1260                         }
1261
1262                         if (compiler.Settings.LoadDefaultReferences) {
1263                                 foreach (string r in GetDefaultReferences ()) {
1264                                         a = LoadAssemblyFile (r, true);
1265                                         if (a == null)
1266                                                 continue;
1267
1268                                         var key = Tuple.Create (module.GlobalRootNamespace, a);
1269                                         if (loaded.Contains (key))
1270                                                 continue;
1271
1272                                         loaded.Add (key);
1273                                 }
1274                         }
1275
1276                         compiler.TimeReporter.Stop (TimeReporter.TimerType.ReferencesLoading);
1277                 }
1278         }
1279 }