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                 string pa_file_version, pa_assembly_version;
  81
  82                 protected AssemblyDefinition (ModuleContainer module, string name)
  83                 {
  84                         this.module = module;
  85                         this.name = Path.GetFileNameWithoutExtension (name);
  86
  87                         wrap_non_exception_throws = true;
  88
  89                         delay_sign = Compiler.Settings.StrongNameDelaySign;
  90
  91                         //
  92                         // Load strong name key early enough for assembly importer to be able to
  93                         // use the keys for InternalsVisibleTo
  94                         // This should go somewhere close to ReferencesLoading but don't have the place yet
  95                         //
  96                         if (Compiler.Settings.HasKeyFileOrContainer) {
  97                                 LoadPublicKey (Compiler.Settings.StrongNameKeyFile, Compiler.Settings.StrongNameKeyContainer);
  98                         }
  99                 }
 100
 101                 protected AssemblyDefinition (ModuleContainer module, string name, string fileName)
 102                         : this (module, name)
 103                 {
 104                         this.file_name = fileName;
 105                 }
 106
 107                 #region Properties
 108
 109                 public Attribute CLSCompliantAttribute {
 110                         get {
 111                                 return cls_attribute;
 112                         }
 113                 }
 114
 115                 public CompilerContext Compiler {
 116                         get {
 117                                 return module.Compiler;
 118                         }
 119                 }
 120
 121                 //
 122                 // Assembly entry point, aka Main method
 123                 //
 124                 public Method EntryPoint {
 125                         get {
 126                                 return entry_point;
 127                         }
 128                         set {
 129                                 entry_point = value;
 130                         }
 131                 }
 132
 133                 public string FullName {
 134                         get {
 135                                 return Builder.FullName;
 136                         }
 137                 }
 138
 139                 public bool HasCLSCompliantAttribute {
 140                         get {
 141                                 return cls_attribute != null;
 142                         }
 143                 }
 144
 145                 // TODO: This should not exist here but will require more changes
 146                 public MetadataImporter Importer {
 147                     get; set;
 148                 }
 149
 150                 public bool IsCLSCompliant {
 151                         get {
 152                                 return is_cls_compliant;
 153                         }
 154                 }
 155
 156                 bool IAssemblyDefinition.IsMissing {
 157                         get {
 158                                 return false;
 159                         }
 160                 }
 161
 162                 public bool IsSatelliteAssembly { get; private set; }
 163
 164                 public string Name {
 165                         get {
 166                                 return name;
 167                         }
 168                 }
 169
 170                 public bool WrapNonExceptionThrows {
 171                         get {
 172                                 return wrap_non_exception_throws;
 173                         }
 174                 }
 175
 176                 protected Report Report {
 177                         get {
 178                                 return Compiler.Report;
 179                         }
 180                 }
 181
 182                 public MonoSymbolFile SymbolWriter {
 183                         get {
 184                                 return symbol_writer;
 185                         }
 186                 }
 187
 188                 #endregion
 189
 190                 public void AddModule (ImportedModuleDefinition module)
 191                 {
 192                         if (added_modules == null) {
 193                                 added_modules = new List<ImportedModuleDefinition> ();
 194                                 added_modules.Add (module);
 195                         }
 196                 }
 197
 198                 public void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 199                 {
 200                         if (a.IsValidSecurityAttribute ()) {
 201                                 a.ExtractSecurityPermissionSet (ctor, ref declarative_security);
 202                                 return;
 203                         }
 204
 205                         if (a.Type == pa.AssemblyCulture) {
 206                                 string value = a.GetString ();
 207                                 if (value == null || value.Length == 0)
 208                                         return;
 209
 210                                 if (Compiler.Settings.Target == Target.Exe) {
 211                                         Report.Error (7059, a.Location, "Executables cannot be satellite assemblies. Remove the attribute or keep it empty");
 212                                         return;
 213                                 }
 214
 215                                 if (value == "neutral")
 216                                         value = "";
 217
 218                                 if (Compiler.Settings.Target == Target.Module) {
 219                                         SetCustomAttribute (ctor, cdata);
 220                                 } else {
 221                                         builder_extra.SetCulture (value, a.Location);
 222                                 }
 223
 224                                 IsSatelliteAssembly = true;
 225                                 return;
 226                         }
 227
 228                         if (a.Type == pa.AssemblyVersion) {
 229                                 string value = a.GetString ();
 230                                 if (value == null || value.Length == 0)
 231                                         return;
 232
 233                                 var vinfo = IsValidAssemblyVersion (value, true);
 234                                 if (vinfo == null) {
 235                                         Report.Error (7034, a.Location, "The specified version string `{0}' does not conform to the required format - major[.minor[.build[.revision]]]",
 236                                                 value);
 237                                         return;
 238                                 }
 239
 240                                 if (Compiler.Settings.Target == Target.Module) {
 241                                         SetCustomAttribute (ctor, cdata);
 242                                 } else {
 243                                         builder_extra.SetVersion (vinfo, a.Location);
 244                                         pa_assembly_version = vinfo.ToString ();
 245                                 }
 246
 247                                 return;
 248                         }
 249
 250                         if (a.Type == pa.AssemblyAlgorithmId) {
 251                                 const int pos = 2; // skip CA header
 252                                 uint alg = (uint) cdata [pos];
 253                                 alg |= ((uint) cdata [pos + 1]) << 8;
 254                                 alg |= ((uint) cdata [pos + 2]) << 16;
 255                                 alg |= ((uint) cdata [pos + 3]) << 24;
 256
 257                                 if (Compiler.Settings.Target == Target.Module) {
 258                                         SetCustomAttribute (ctor, cdata);
 259                                 } else {
 260                                         builder_extra.SetAlgorithmId (alg, a.Location);
 261                                 }
 262
 263                                 return;
 264                         }
 265
 266                         if (a.Type == pa.AssemblyFlags) {
 267                                 const int pos = 2; // skip CA header
 268                                 uint flags = (uint) cdata[pos];
 269                                 flags |= ((uint) cdata [pos + 1]) << 8;
 270                                 flags |= ((uint) cdata [pos + 2]) << 16;
 271                                 flags |= ((uint) cdata [pos + 3]) << 24;
 272
 273                                 // Ignore set PublicKey flag if assembly is not strongnamed
 274                                 if ((flags & (uint) AssemblyNameFlags.PublicKey) != 0 && public_key == null)
 275                                         flags &= ~(uint) AssemblyNameFlags.PublicKey;
 276
 277                                 if (Compiler.Settings.Target == Target.Module) {
 278                                         SetCustomAttribute (ctor, cdata);
 279                                 } else {
 280                                         builder_extra.SetFlags (flags, a.Location);
 281                                 }
 282
 283                                 return;
 284                         }
 285
 286                         if (a.Type == pa.TypeForwarder) {
 287                                 TypeSpec t = a.GetArgumentType ();
 288                                 if (t == null || TypeManager.HasElementType (t)) {
 289                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
 290                                         return;
 291                                 }
 292
 293                                 if (emitted_forwarders == null) {
 294                                         emitted_forwarders = new Dictionary<ITypeDefinition, Attribute> ();
 295                                 } else if (emitted_forwarders.ContainsKey (t.MemberDefinition)) {
 296                                         Report.SymbolRelatedToPreviousError (emitted_forwarders[t.MemberDefinition].Location, null);
 297                                         Report.Error (739, a.Location, "A duplicate type forward of type `{0}'",
 298                                                 t.GetSignatureForError ());
 299                                         return;
 300                                 }
 301
 302                                 emitted_forwarders.Add (t.MemberDefinition, a);
 303
 304                                 if (t.MemberDefinition.DeclaringAssembly == this) {
 305                                         Report.SymbolRelatedToPreviousError (t);
 306                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
 307                                                 t.GetSignatureForError ());
 308                                         return;
 309                                 }
 310
 311                                 if (t.IsNested) {
 312                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
 313                                                 t.GetSignatureForError ());
 314                                         return;
 315                                 }
 316
 317                                 AddTypeForwarders (t, a.Location);
 318                                 return;
 319                         }
 320
 321                         if (a.Type == pa.Extension) {
 322                                 a.Error_MisusedExtensionAttribute ();
 323                                 return;
 324                         }
 325
 326                         if (a.Type == pa.InternalsVisibleTo) {
 327                                 string assembly_name = a.GetString ();
 328                                 if (assembly_name == null) {
 329                                         Report.Error (7030, a.Location, "Friend assembly reference cannot have `null' value");
 330                                         return;
 331                                 }
 332
 333                                 if (assembly_name.Length == 0)
 334                                         return;
 335 #if STATIC
 336                                 ParsedAssemblyName aname;
 337                                 ParseAssemblyResult r = Fusion.ParseAssemblyName (assembly_name, out aname);
 338                                 if (r != ParseAssemblyResult.OK) {
 339                                         Report.Warning (1700, 3, a.Location, "Friend assembly reference `{0}' is invalid and cannot be resolved",
 340                                                 assembly_name);
 341                                         return;
 342                                 }
 343
 344                                 if (aname.Version != null || aname.Culture != null || aname.ProcessorArchitecture != ProcessorArchitecture.None) {
 345                                         Report.Error (1725, a.Location,
 346                                                 "Friend assembly reference `{0}' is invalid. InternalsVisibleTo declarations cannot have a version, culture or processor architecture specified",
 347                                                 assembly_name);
 348
 349                                         return;
 350                                 }
 351
 352                                 if (public_key != null && !aname.HasPublicKey) {
 353                                         Report.Error (1726, a.Location,
 354                                                 "Friend assembly reference `{0}' is invalid. Strong named assemblies must specify a public key in their InternalsVisibleTo declarations",
 355                                                 assembly_name);
 356                                         return;
 357                                 }
 358 #endif
 359                         } else if (a.Type == pa.RuntimeCompatibility) {
 360                                 wrap_non_exception_throws_custom = true;
 361                         } else if (a.Type == pa.AssemblyFileVersion) {
 362                                 pa_file_version = a.GetString ();
 363                                 if (string.IsNullOrEmpty (pa_file_version) || IsValidAssemblyVersion (pa_file_version, false) == null) {
 364                                         Report.Warning (7035, 1, a.Location, "The specified version string `{0}' does not conform to the recommended format major.minor.build.revision",
 365                                                         pa_file_version, a.Name);
 366                                         return;
 367                                 }
 368
 369                                 // File version info decoding from blob is not supported
 370                                 var cab = new CustomAttributeBuilder ((ConstructorInfo)ctor.GetMetaInfo (), new object [] { pa_file_version });
 371                                 Builder.SetCustomAttribute (cab);
 372                                 return;
 373                         } else if (a.Type == pa.AssemblyProduct) {
 374                                 vi_product = a.GetString ();
 375                         } else if (a.Type == pa.AssemblyCompany) {
 376                                 vi_company = a.GetString ();
 377                         } else if (a.Type == pa.AssemblyCopyright) {
 378                                 vi_copyright = a.GetString ();
 379                         } else if (a.Type == pa.AssemblyTrademark) {
 380                                 vi_trademark = a.GetString ();
 381                         } else if (a.Type == pa.Debuggable) {
 382                                 has_user_debuggable = true;
 383                         } else if (a.Type == pa.AssemblyInformationalVersion) {
 384                                 vi_product_version = a.GetString ();
 385                         }
 386
 387                         //
 388                         // Win32 version info attributes AssemblyDescription and AssemblyTitle cannot be
 389                         // set using public API and because we have blob like attributes we need to use
 390                         // special option DecodeVersionInfoAttributeBlobs to support values extraction
 391                         //
 392
 393                         SetCustomAttribute (ctor, cdata);
 394                 }
 395
 396                 void AddTypeForwarders (TypeSpec type, Location loc)
 397                 {
 398                         builder_extra.AddTypeForwarder (type.GetDefinition (), loc);
 399
 400                         var ntypes = MemberCache.GetDeclaredNestedTypes (type);
 401                         if (ntypes == null)
 402                                 return;
 403
 404                         foreach (var nested in ntypes) {
 405                                 if (nested.IsPrivate)
 406                                         continue;
 407
 408                                 AddTypeForwarders (nested, loc);
 409                         }
 410                 }
 411
 412                 //
 413                 // When using assembly public key attributes InternalsVisibleTo key
 414                 // was not checked, we have to do it later when we actually know what
 415                 // our public key token is
 416                 //
 417                 void CheckReferencesPublicToken ()
 418                 {
 419                         foreach (var an in builder_extra.GetReferencedAssemblies ()) {
 420                                 if (public_key != null && an.GetPublicKey ().Length == 0) {
 421                                         Report.Error (1577, "Referenced assembly `{0}' does not have a strong name",
 422                                                 an.FullName);
 423                                 }
 424
 425                                 var ci = an.CultureInfo;
 426                                 if (!ci.Equals (CultureInfo.InvariantCulture)) {
 427                                         Report.Warning (8009, 1, "Referenced assembly `{0}' has different culture setting of `{1}'",
 428                                                 an.Name, ci.Name);
 429                                 }
 430
 431                                 var ia = Importer.GetImportedAssemblyDefinition (an);
 432                                 if (ia == null)
 433                                         continue;
 434
 435                                 var references = GetNotUnifiedReferences (an);
 436                                 if (references != null) {
 437                                         foreach (var r in references) {
 438                                                 Report.SymbolRelatedToPreviousError ( r[0]);
 439                                                 Report.Error (1705, r [1]);
 440                                         }
 441                                 }
 442
 443                                 if (!ia.IsFriendAssemblyTo (this))
 444                                         continue;
 445
 446                                 var attr = ia.GetAssemblyVisibleToName (this);
 447                                 var atoken = attr.GetPublicKeyToken ();
 448
 449                                 if (ArrayComparer.IsEqual (GetPublicKeyToken (), atoken))
 450                                         continue;
 451
 452                                 Report.SymbolRelatedToPreviousError (ia.Location);
 453                                 Report.Error (281,
 454                                         "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",
 455                                         attr.FullName, FullName);
 456                         }
 457                 }
 458
 459                 protected AssemblyName CreateAssemblyName ()
 460                 {
 461                         var an = new AssemblyName (name);
 462
 463                         if (public_key != null && Compiler.Settings.Target != Target.Module) {
 464                                 if (delay_sign) {
 465                                         an.SetPublicKey (public_key);
 466                                 } else {
 467                                         if (public_key.Length == 16) {
 468                                                 Report.Error (1606, "Could not sign the assembly. ECMA key can only be used to delay-sign assemblies");
 469                                         } else if (private_key == null) {
 470                                                 Error_AssemblySigning ("The specified key file does not have a private key");
 471                                         } else {
 472                                                 an.KeyPair = private_key;
 473                                         }
 474                                 }
 475                         }
 476
 477                         return an;
 478                 }
 479
 480                 public virtual ModuleBuilder CreateModuleBuilder ()
 481                 {
 482                         if (file_name == null)
 483                                 throw new NotSupportedException ("transient module in static assembly");
 484
 485                         var module_name = Path.GetFileName (file_name);
 486
 487                         // Always initialize module without symbolInfo. We could be framework dependent
 488                         // but returned ISymbolWriter does not have all what we need therefore some
 489                         // adaptor will be needed for now we alwayas emit MDB format when generating
 490                         // debug info
 491                         return Builder.DefineDynamicModule (module_name, module_name, false);
 492                 }
 493
 494                 public virtual void Emit ()
 495                 {
 496                         if (Compiler.Settings.Target == Target.Module) {
 497                                 module_target_attrs = new AssemblyAttributesPlaceholder (module, name);
 498                                 module_target_attrs.CreateContainer ();
 499                                 module_target_attrs.DefineContainer ();
 500                                 module_target_attrs.Define ();
 501                                 module.AddCompilerGeneratedClass (module_target_attrs);
 502                         } else if (added_modules != null) {
 503                                 ReadModulesAssemblyAttributes ();
 504                         }
 505
 506                         if (Compiler.Settings.GenerateDebugInfo) {
 507                                 symbol_writer = new MonoSymbolFile ();
 508                         }
 509
 510                         module.EmitContainer ();
 511
 512                         if (module.HasExtensionMethod) {
 513                                 var pa = module.PredefinedAttributes.Extension;
 514                                 if (pa.IsDefined) {
 515                                         SetCustomAttribute (pa.Constructor, AttributeEncoder.Empty);
 516                                 }
 517                         }
 518
 519                         if (!IsSatelliteAssembly) {
 520                                 if (!has_user_debuggable && Compiler.Settings.GenerateDebugInfo) {
 521                                         var pa = module.PredefinedAttributes.Debuggable;
 522                                         if (pa.IsDefined) {
 523                                                 var modes = System.Diagnostics.DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints;
 524                                                 if (!Compiler.Settings.Optimize)
 525                                                         modes |= System.Diagnostics.DebuggableAttribute.DebuggingModes.DisableOptimizations;
 526
 527                                                 pa.EmitAttribute (Builder, modes);
 528                                         }
 529                                 }
 530
 531                                 if (!wrap_non_exception_throws_custom) {
 532                                         PredefinedAttribute pa = module.PredefinedAttributes.RuntimeCompatibility;
 533                                         if (pa.IsDefined && pa.ResolveBuilder ()) {
 534                                                 var prop = module.PredefinedMembers.RuntimeCompatibilityWrapNonExceptionThrows.Get ();
 535                                                 if (prop != null) {
 536                                                         AttributeEncoder encoder = new AttributeEncoder ();
 537                                                         encoder.EncodeNamedPropertyArgument (prop, new BoolLiteral (Compiler.BuiltinTypes, true, Location.Null));
 538                                                         SetCustomAttribute (pa.Constructor, encoder.ToArray ());
 539                                                 }
 540                                         }
 541                                 }
 542
 543                                 if (declarative_security != null) {
 544 #if STATIC
 545                                         foreach (var entry in declarative_security) {
 546                                                 Builder.__AddDeclarativeSecurity (entry);
 547                                         }
 548 #else
 549                                         throw new NotSupportedException ("Assembly-level security");
 550 #endif
 551                                 }
 552                         }
 553
 554                         CheckReferencesPublicToken ();
 555
 556                         SetEntryPoint ();
 557                 }
 558
 559                 public byte[] GetPublicKeyToken ()
 560                 {
 561                         if (public_key == null || public_key_token != null)
 562                                 return public_key_token;
 563
 564                         HashAlgorithm ha = SHA1.Create ();
 565                         byte[] hash = ha.ComputeHash (public_key);
 566                         // we need the last 8 bytes in reverse order
 567                         public_key_token = new byte[8];
 568                         Buffer.BlockCopy (hash, hash.Length - 8, public_key_token, 0, 8);
 569                         Array.Reverse (public_key_token, 0, 8);
 570                         return public_key_token;
 571                 }
 572
 573                 protected virtual List<string[]> GetNotUnifiedReferences (AssemblyName assemblyName)
 574                 {
 575                         return null;
 576                 }
 577
 578                 //
 579                 // Either keyFile or keyContainer has to be non-null
 580                 //
 581                 void LoadPublicKey (string keyFile, string keyContainer)
 582                 {
 583                         if (keyContainer != null) {
 584                                 try {
 585                                         private_key = new StrongNameKeyPair (keyContainer);
 586                                         public_key = private_key.PublicKey;
 587                                 } catch {
 588                                         Error_AssemblySigning ("The specified key container `" + keyContainer + "' does not exist");
 589                                 }
 590
 591                                 return;
 592                         }
 593
 594                         bool key_file_exists = File.Exists (keyFile);
 595
 596                         //
 597                         // For attribute based KeyFile do additional lookup
 598                         // in output assembly path
 599                         //
 600                         if (!key_file_exists && Compiler.Settings.StrongNameKeyFile == null) {
 601                                 //
 602                                 // The key file can be relative to output assembly
 603                                 //
 604                                 string test_path = Path.Combine (Path.GetDirectoryName (file_name), keyFile);
 605                                 key_file_exists = File.Exists (test_path);
 606                                 if (key_file_exists)
 607                                         keyFile = test_path;
 608                         }
 609
 610                         if (!key_file_exists) {
 611                                 Error_AssemblySigning ("The specified key file `" + keyFile + "' does not exist");
 612                                 return;
 613                         }
 614
 615                         using (FileStream fs = new FileStream (keyFile, FileMode.Open, FileAccess.Read)) {
 616                                 byte[] snkeypair = new byte[fs.Length];
 617                                 fs.Read (snkeypair, 0, snkeypair.Length);
 618
 619                                 // check for ECMA key
 620                                 if (snkeypair.Length == 16) {
 621                                         public_key = snkeypair;
 622                                         return;
 623                                 }
 624
 625                                 try {
 626                                         // take it, with or without, a private key
 627                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (snkeypair);
 628                                         // and make sure we only feed the public part to Sys.Ref
 629                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
 630
 631                                         // AssemblyName.SetPublicKey requires an additional header
 632                                         byte[] publicKeyHeader = new byte[8] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00 };
 633
 634                                         // Encode public key
 635                                         public_key = new byte[12 + publickey.Length];
 636                                         Buffer.BlockCopy (publicKeyHeader, 0, public_key, 0, publicKeyHeader.Length);
 637
 638                                         // Length of Public Key (in bytes)
 639                                         int lastPart = public_key.Length - 12;
 640                                         public_key[8] = (byte) (lastPart & 0xFF);
 641                                         public_key[9] = (byte) ((lastPart >> 8) & 0xFF);
 642                                         public_key[10] = (byte) ((lastPart >> 16) & 0xFF);
 643                                         public_key[11] = (byte) ((lastPart >> 24) & 0xFF);
 644
 645                                         Buffer.BlockCopy (publickey, 0, public_key, 12, publickey.Length);
 646                                 } catch {
 647                                         Error_AssemblySigning ("The specified key file `" + keyFile + "' has incorrect format");
 648                                         return;
 649                                 }
 650
 651                                 if (delay_sign)
 652                                         return;
 653
 654                                 try {
 655                                         // TODO: Is there better way to test for a private key presence ?
 656                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
 657                                         private_key = new StrongNameKeyPair (snkeypair);
 658                                 } catch { }
 659                         }
 660                 }
 661
 662                 void ReadModulesAssemblyAttributes ()
 663                 {
 664                         foreach (var m in added_modules) {
 665                                 var cattrs = m.ReadAssemblyAttributes ();
 666                                 if (cattrs == null)
 667                                         continue;
 668
 669                                 module.OptAttributes.AddAttributes (cattrs);
 670                         }
 671                 }
 672
 673                 public void Resolve ()
 674                 {
 675                         if (Compiler.Settings.Unsafe && module.PredefinedTypes.SecurityAction.Define ()) {
 676                                 //
 677                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
 678                                 // when -unsafe option was specified
 679                                 //
 680                                 Location loc = Location.Null;
 681
 682                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
 683                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
 684
 685                                 var req_min = module.PredefinedMembers.SecurityActionRequestMinimum.Resolve (loc);
 686
 687                                 Arguments pos = new Arguments (1);
 688                                 pos.Add (new Argument (req_min.GetConstant (null)));
 689
 690                                 Arguments named = new Arguments (1);
 691                                 named.Add (new NamedArgument ("SkipVerification", loc, new BoolLiteral (Compiler.BuiltinTypes, true, loc)));
 692
 693                                 Attribute g = new Attribute ("assembly",
 694                                         new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
 695                                         new Arguments[] { pos, named }, loc, false);
 696                                 g.AttachTo (module, module);
 697
 698                                 // Disable no-location warnings (e.g. obsolete) for compiler generated attribute
 699                                 Compiler.Report.DisableReporting ();
 700                                 try {
 701                                         var ctor = g.Resolve ();
 702                                         if (ctor != null) {
 703                                                 g.ExtractSecurityPermissionSet (ctor, ref declarative_security);
 704                                         }
 705                                 } finally {
 706                                         Compiler.Report.EnableReporting ();
 707                                 }
 708                         }
 709
 710                         if (module.OptAttributes == null)
 711                                 return;
 712
 713                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
 714                         if (!module.OptAttributes.CheckTargets())
 715                                 return;
 716
 717                         cls_attribute = module.ResolveAssemblyAttribute (module.PredefinedAttributes.CLSCompliant);
 718
 719                         if (cls_attribute != null) {
 720                                 is_cls_compliant = cls_attribute.GetClsCompliantAttributeValue ();
 721                         }
 722
 723                         if (added_modules != null && Compiler.Settings.VerifyClsCompliance && is_cls_compliant) {
 724                                 foreach (var m in added_modules) {
 725                                         if (!m.IsCLSCompliant) {
 726                                                 Report.Error (3013,
 727                                                         "Added modules must be marked with the CLSCompliant attribute to match the assembly",
 728                                                         m.Name);
 729                                         }
 730                                 }
 731                         }
 732
 733                         Attribute a = module.ResolveAssemblyAttribute (module.PredefinedAttributes.RuntimeCompatibility);
 734                         if (a != null) {
 735                                 var val = a.GetNamedValue ("WrapNonExceptionThrows") as BoolConstant;
 736                                 if (val != null)
 737                                         wrap_non_exception_throws = val.Value;
 738                         }
 739                 }
 740
 741                 protected void ResolveAssemblySecurityAttributes ()
 742                 {
 743                         string key_file = null;
 744                         string key_container = null;
 745
 746                         if (module.OptAttributes != null) {
 747                                 foreach (Attribute a in module.OptAttributes.Attrs) {
 748                                         // cannot rely on any resolve-based members before you call Resolve
 749                                         if (a.ExplicitTarget != "assembly")
 750                                                 continue;
 751
 752                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
 753                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
 754                                         //       are loaded yet.
 755                                         // TODO: Does not handle quoted attributes properly
 756                                         switch (a.Name) {
 757                                         case "AssemblyKeyFile":
 758                                         case "AssemblyKeyFileAttribute":
 759                                         case "System.Reflection.AssemblyKeyFileAttribute":
 760                                                 if (Compiler.Settings.StrongNameKeyFile != null) {
 761                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 762                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 763                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
 764                                                 } else {
 765                                                         string value = a.GetString ();
 766                                                         if (!string.IsNullOrEmpty (value)) {
 767                                                                 Error_ObsoleteSecurityAttribute (a, "keyfile");
 768                                                                 key_file = value;
 769                                                         }
 770                                                 }
 771                                                 break;
 772                                         case "AssemblyKeyName":
 773                                         case "AssemblyKeyNameAttribute":
 774                                         case "System.Reflection.AssemblyKeyNameAttribute":
 775                                                 if (Compiler.Settings.StrongNameKeyContainer != null) {
 776                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 777                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 778                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
 779                                                 } else {
 780                                                         string value = a.GetString ();
 781                                                         if (!string.IsNullOrEmpty (value)) {
 782                                                                 Error_ObsoleteSecurityAttribute (a, "keycontainer");
 783                                                                 key_container = value;
 784                                                         }
 785                                                 }
 786                                                 break;
 787                                         case "AssemblyDelaySign":
 788                                         case "AssemblyDelaySignAttribute":
 789                                         case "System.Reflection.AssemblyDelaySignAttribute":
 790                                                 bool b = a.GetBoolean ();
 791                                                 if (b) {
 792                                                         Error_ObsoleteSecurityAttribute (a, "delaysign");
 793                                                 }
 794
 795                                                 delay_sign = b;
 796                                                 break;
 797                                         }
 798                                 }
 799                         }
 800
 801                         // We came here only to report assembly attributes warnings
 802                         if (public_key != null)
 803                                 return;
 804
 805                         //
 806                         // Load the strong key file found in attributes when no
 807                         // command line key was given
 808                         //
 809                         if (key_file != null || key_container != null) {
 810                                 LoadPublicKey (key_file, key_container);
 811                         } else if (delay_sign) {
 812                                 Report.Warning (1607, 1, "Delay signing was requested but no key file was given");
 813                         }
 814                 }
 815
 816                 public void EmbedResources ()
 817                 {
 818                         //
 819                         // Add Win32 resources
 820                         //
 821                         if (Compiler.Settings.Win32ResourceFile != null) {
 822                                 Builder.DefineUnmanagedResource (Compiler.Settings.Win32ResourceFile);
 823                         } else {
 824                                 Builder.DefineVersionInfoResource (vi_product,
 825                                                                    vi_product_version ?? pa_file_version ?? pa_assembly_version,
 826                                                                    vi_company,
 827                                                                    vi_copyright,
 828                                                                    vi_trademark);
 829                         }
 830
 831                         if (Compiler.Settings.Win32IconFile != null) {
 832                                 builder_extra.DefineWin32IconResource (Compiler.Settings.Win32IconFile);
 833                         }
 834
 835                         if (Compiler.Settings.Resources != null) {
 836                                 if (Compiler.Settings.Target == Target.Module) {
 837                                         Report.Error (1507, "Cannot link resource file when building a module");
 838                                 } else {
 839                                         int counter = 0;
 840                                         foreach (var res in Compiler.Settings.Resources) {
 841                                                 if (!File.Exists (res.FileName)) {
 842                                                         Report.Error (1566, "Error reading resource file `{0}'", res.FileName);
 843                                                         continue;
 844                                                 }
 845
 846                                                 if (res.IsEmbeded) {
 847                                                         Stream stream;
 848                                                         if (counter++ < 10) {
 849                                                                 stream = File.OpenRead (res.FileName);
 850                                                         } else {
 851                                                                 // TODO: SRE API requires resource stream to be available during AssemblyBuilder::Save
 852                                                                 // we workaround it by reading everything into memory to compile projects with
 853                                                                 // many embedded resource (over 3500) references
 854                                                                 stream = new MemoryStream (File.ReadAllBytes (res.FileName));
 855                                                         }
 856
 857                                                         module.Builder.DefineManifestResource (res.Name, stream, res.Attributes);
 858                                                 } else {
 859                                                         Builder.AddResourceFile (res.Name, Path.GetFileName (res.FileName), res.Attributes);
 860                                                 }
 861                                         }
 862                                 }
 863                         }
 864                 }
 865
 866                 public void Save ()
 867                 {
 868                         PortableExecutableKinds pekind = PortableExecutableKinds.ILOnly;
 869                         ImageFileMachine machine;
 870
 871                         switch (Compiler.Settings.Platform) {
 872                         case Platform.X86:
 873                                 pekind |= PortableExecutableKinds.Required32Bit;
 874                                 machine = ImageFileMachine.I386;
 875                                 break;
 876                         case Platform.X64:
 877                                 pekind |= PortableExecutableKinds.PE32Plus;
 878                                 machine = ImageFileMachine.AMD64;
 879                                 break;
 880                         case Platform.IA64:
 881                                 machine = ImageFileMachine.IA64;
 882                                 break;
 883                         case Platform.AnyCPU32Preferred:
 884 #if STATIC
 885                                 pekind |= PortableExecutableKinds.Preferred32Bit;
 886                                 machine = ImageFileMachine.I386;
 887                                 break;
 888 #else
 889                                 throw new NotSupportedException ();
 890 #endif
 891                         case Platform.Arm:
 892 #if STATIC
 893                                 machine = ImageFileMachine.ARM;
 894                                 break;
 895 #else
 896                                 throw new NotSupportedException ();
 897 #endif
 898                         case Platform.AnyCPU:
 899                         default:
 900                                 machine = ImageFileMachine.I386;
 901                                 break;
 902                         }
 903
 904                         Compiler.TimeReporter.Start (TimeReporter.TimerType.OutputSave);
 905                         try {
 906                                 if (Compiler.Settings.Target == Target.Module) {
 907                                         SaveModule (pekind, machine);
 908                                 } else {
 909                                         Builder.Save (module.Builder.ScopeName, pekind, machine);
 910                                 }
 911                         } catch (ArgumentOutOfRangeException) {
 912                                 Report.Error (16, "Output file `{0}' exceeds the 4GB limit", name);
 913                         } catch (Exception e) {
 914                                 Report.Error (16, "Could not write to file `{0}'. {1}", name, e.Message);
 915                         }
 916                         Compiler.TimeReporter.Stop (TimeReporter.TimerType.OutputSave);
 917
 918                         // Save debug symbols file
 919                         if (symbol_writer != null && Compiler.Report.Errors == 0) {
 920                                 // TODO: it should run in parallel
 921                                 Compiler.TimeReporter.Start (TimeReporter.TimerType.DebugSave);
 922
 923                                 var filename = file_name + ".mdb";
 924                                 try {
 925                                         // We mmap the file, so unlink the previous version since it may be in use
 926                                         File.Delete (filename);
 927                                 } catch {
 928                                         // We can safely ignore
 929                                 }
 930
 931                                 module.WriteDebugSymbol (symbol_writer);
 932
 933                                 using (FileStream fs = new FileStream (filename, FileMode.Create, FileAccess.Write)) {
 934                                         symbol_writer.CreateSymbolFile (module.Builder.ModuleVersionId, fs);
 935                                 }
 936
 937                                 Compiler.TimeReporter.Stop (TimeReporter.TimerType.DebugSave);
 938                         }
 939                 }
 940
 941                 protected virtual void SaveModule (PortableExecutableKinds pekind, ImageFileMachine machine)
 942                 {
 943                         Report.RuntimeMissingSupport (Location.Null, "-target:module");
 944                 }
 945
 946                 void SetCustomAttribute (MethodSpec ctor, byte[] data)
 947                 {
 948                         if (module_target_attrs != null)
 949                                 module_target_attrs.AddAssemblyAttribute (ctor, data);
 950                         else
 951                                 Builder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), data);
 952                 }
 953
 954                 void SetEntryPoint ()
 955                 {
 956                         if (!Compiler.Settings.NeedsEntryPoint) {
 957                                 if (Compiler.Settings.MainClass != null)
 958                                         Report.Error (2017, "Cannot specify -main if building a module or library");
 959
 960                                 return;
 961                         }
 962
 963                         PEFileKinds file_kind;
 964
 965                         switch (Compiler.Settings.Target) {
 966                         case Target.Library:
 967                         case Target.Module:
 968                                 file_kind = PEFileKinds.Dll;
 969                                 break;
 970                         case Target.WinExe:
 971                                 file_kind = PEFileKinds.WindowApplication;
 972                                 break;
 973                         default:
 974                                 file_kind = PEFileKinds.ConsoleApplication;
 975                                 break;
 976                         }
 977
 978                         if (entry_point == null) {
 979                                 string main_class = Compiler.Settings.MainClass;
 980                                 if (main_class != null) {
 981                                         // TODO: Handle dotted names
 982                                         var texpr = module.GlobalRootNamespace.LookupType (module, main_class, 0, LookupMode.Probing, Location.Null);
 983                                         if (texpr == null) {
 984                                                 Report.Error (1555, "Could not find `{0}' specified for Main method", main_class);
 985                                                 return;
 986                                         }
 987
 988                                         var mtype = texpr.MemberDefinition as ClassOrStruct;
 989                                         if (mtype == null) {
 990                                                 Report.Error (1556, "`{0}' specified for Main method must be a valid class or struct", main_class);
 991                                                 return;
 992                                         }
 993
 994                                         Report.Error (1558, mtype.Location, "`{0}' does not have a suitable static Main method", mtype.GetSignatureForError ());
 995                                 } else {
 996                                         string pname = file_name == null ? name : Path.GetFileName (file_name);
 997                                         Report.Error (5001, "Program `{0}' does not contain a static `Main' method suitable for an entry point",
 998                                                 pname);
 999                                 }
1000
1001                                 return;
1002                         }
1003
1004                         Builder.SetEntryPoint (entry_point.MethodBuilder, file_kind);
1005                 }
1006
1007                 void Error_ObsoleteSecurityAttribute (Attribute a, string option)
1008                 {
1009                         Report.Warning (1699, 1, a.Location,
1010                                 "Use compiler option `{0}' or appropriate project settings instead of `{1}' attribute",
1011                                 option, a.Name);
1012                 }
1013
1014                 void Error_AssemblySigning (string text)
1015                 {
1016                         Report.Error (1548, "Error during assembly signing. " + text);
1017                 }
1018
1019                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1020                 {
1021                         return false;
1022                 }
1023
1024                 static Version IsValidAssemblyVersion (string version, bool allowGenerated)
1025                 {
1026                         string[] parts = version.Split ('.');
1027                         if (parts.Length < 1 || parts.Length > 4)
1028                                 return null;
1029
1030                         var values = new int[4];
1031                         for (int i = 0; i < parts.Length; ++i) {
1032                                 if (!int.TryParse (parts[i], out values[i])) {
1033                                         if (parts[i].Length == 1 && parts[i][0] == '*' && allowGenerated) {
1034                                                 if (i == 2) {
1035                                                         // Nothing can follow *
1036                                                         if (parts.Length > 3)
1037                                                                 return null;
1038
1039                                                         // Generate Build value based on days since 1/1/2000
1040                                                         TimeSpan days = DateTime.Today - new DateTime (2000, 1, 1);
1041                                                         values[i] = System.Math.Max (days.Days, 0);
1042                                                         i = 3;
1043                                                 }
1044
1045                                                 if (i == 3) {
1046                                                         // Generate Revision value based on every other second today
1047                                                         var seconds = DateTime.Now - DateTime.Today;
1048                                                         values[i] = (int) seconds.TotalSeconds / 2;
1049                                                         continue;
1050                                                 }
1051                                         }
1052
1053                                         return null;
1054                                 }
1055
1056                                 if (values[i] > ushort.MaxValue)
1057                                         return null;
1058                         }
1059
1060                         return new Version (values[0], values[1], values[2], values[3]);
1061                 }
1062         }
1063
1064         public class AssemblyResource : IEquatable<AssemblyResource>
1065         {
1066                 public AssemblyResource (string fileName, string name)
1067                         : this (fileName, name, false)
1068                 {
1069                 }
1070
1071                 public AssemblyResource (string fileName, string name, bool isPrivate)
1072                 {
1073                         FileName = fileName;
1074                         Name = name;
1075                         Attributes = isPrivate ? ResourceAttributes.Private : ResourceAttributes.Public;
1076                 }
1077
1078                 public ResourceAttributes Attributes { get; private set; }
1079                 public string Name { get; private set; }
1080                 public string FileName { get; private set; }
1081                 public bool IsEmbeded { get; set; }
1082
1083                 #region IEquatable<AssemblyResource> Members
1084
1085                 public bool Equals (AssemblyResource other)
1086                 {
1087                         return Name == other.Name;
1088                 }
1089
1090                 #endregion
1091         }
1092
1093         //
1094         // A placeholder class for assembly attributes when emitting module
1095         //
1096         class AssemblyAttributesPlaceholder : CompilerGeneratedContainer
1097         {
1098                 static readonly string TypeNamePrefix = "<$AssemblyAttributes${0}>";
1099                 public static readonly string AssemblyFieldName = "attributes";
1100
1101                 Field assembly;
1102
1103                 public AssemblyAttributesPlaceholder (ModuleContainer parent, string outputName)
1104                         : base (parent, new MemberName (GetGeneratedName (outputName)), Modifiers.STATIC | Modifiers.INTERNAL)
1105                 {
1106                         assembly = new Field (this, new TypeExpression (parent.Compiler.BuiltinTypes.Object, Location), Modifiers.PUBLIC | Modifiers.STATIC,
1107                                 new MemberName (AssemblyFieldName), null);
1108
1109                         AddField (assembly);
1110                 }
1111
1112                 public void AddAssemblyAttribute (MethodSpec ctor, byte[] data)
1113                 {
1114                         assembly.SetCustomAttribute (ctor, data);
1115                 }
1116
1117                 public static string GetGeneratedName (string outputName)
1118                 {
1119                         return string.Format (TypeNamePrefix, outputName);
1120                 }
1121         }
1122
1123         //
1124         // Extension to System.Reflection.Emit.AssemblyBuilder to have fully compatible
1125         // compiler. This is a default implementation for framework System.Reflection.Emit
1126         // which does not implement any of the methods
1127         //
1128         public class AssemblyBuilderExtension
1129         {
1130                 protected readonly CompilerContext ctx;
1131
1132                 public AssemblyBuilderExtension (CompilerContext ctx)
1133                 {
1134                         this.ctx = ctx;
1135                 }
1136
1137                 public virtual System.Reflection.Module AddModule (string module)
1138                 {
1139                         ctx.Report.RuntimeMissingSupport (Location.Null, "-addmodule");
1140                         return null;
1141                 }
1142
1143                 public virtual void AddPermissionRequests (PermissionSet[] permissions)
1144                 {
1145                         ctx.Report.RuntimeMissingSupport (Location.Null, "assembly declarative security");
1146                 }
1147
1148                 public virtual void AddTypeForwarder (TypeSpec type, Location loc)
1149                 {
1150                         ctx.Report.RuntimeMissingSupport (loc, "TypeForwardedToAttribute");
1151                 }
1152
1153                 public virtual void DefineWin32IconResource (string fileName)
1154                 {
1155                         ctx.Report.RuntimeMissingSupport (Location.Null, "-win32icon");
1156                 }
1157
1158                 public virtual AssemblyName[] GetReferencedAssemblies ()
1159                 {
1160                         return null;
1161                 }
1162
1163                 public virtual void SetAlgorithmId (uint value, Location loc)
1164                 {
1165                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyAlgorithmIdAttribute");
1166                 }
1167
1168                 public virtual void SetCulture (string culture, Location loc)
1169                 {
1170                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyCultureAttribute");
1171                 }
1172
1173                 public virtual void SetFlags (uint flags, Location loc)
1174                 {
1175                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyFlagsAttribute");
1176                 }
1177
1178                 public virtual void SetVersion (Version version, Location loc)
1179                 {
1180                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyVersionAttribute");
1181                 }
1182         }
1183
1184         abstract class AssemblyReferencesLoader<T> where T : class
1185         {
1186                 protected readonly CompilerContext compiler;
1187
1188                 protected readonly List<string> paths;
1189
1190                 protected AssemblyReferencesLoader (CompilerContext compiler)
1191                 {
1192                         this.compiler = compiler;
1193
1194                         paths = new List<string> ();
1195                         paths.Add (Directory.GetCurrentDirectory ());
1196                         paths.AddRange (compiler.Settings.ReferencesLookupPaths);
1197                 }
1198
1199                 public abstract T HasObjectType (T assembly);
1200                 protected abstract string[] GetDefaultReferences ();
1201                 public abstract T LoadAssemblyFile (string fileName, bool isImplicitReference);
1202                 public abstract void LoadReferences (ModuleContainer module);
1203
1204                 protected void Error_FileNotFound (string fileName)
1205                 {
1206                         compiler.Report.Error (6, "Metadata file `{0}' could not be found", fileName);
1207                 }
1208
1209                 protected void Error_FileCorrupted (string fileName)
1210                 {
1211                         compiler.Report.Error (9, "Metadata file `{0}' does not contain valid metadata", fileName);
1212                 }
1213
1214                 protected void Error_AssemblyIsModule (string fileName)
1215                 {
1216                         compiler.Report.Error (1509,
1217                                 "Referenced assembly file `{0}' is a module. Consider using `-addmodule' option to add the module",
1218                                 fileName);
1219                 }
1220
1221                 protected void Error_ModuleIsAssembly (string fileName)
1222                 {
1223                         compiler.Report.Error (1542,
1224                                 "Added module file `{0}' is an assembly. Consider using `-r' option to reference the file",
1225                                 fileName);
1226                 }
1227
1228                 protected void LoadReferencesCore (ModuleContainer module, out T corlib_assembly, out List<Tuple<RootNamespace, T>> loaded)
1229                 {
1230                         compiler.TimeReporter.Start (TimeReporter.TimerType.ReferencesLoading);
1231
1232                         loaded = new List<Tuple<RootNamespace, T>> ();
1233
1234                         //
1235                         // Load mscorlib.dll as the first
1236                         //
1237                         if (module.Compiler.Settings.StdLib) {
1238                                 corlib_assembly = LoadAssemblyFile ("mscorlib.dll", true);
1239                         } else {
1240                                 corlib_assembly = default (T);
1241                         }
1242
1243                         T a;
1244                         foreach (string r in module.Compiler.Settings.AssemblyReferences) {
1245                                 a = LoadAssemblyFile (r, false);
1246                                 if (a == null || EqualityComparer<T>.Default.Equals (a, corlib_assembly))
1247                                         continue;
1248
1249                                 var key = Tuple.Create (module.GlobalRootNamespace, a);
1250                                 if (loaded.Contains (key))
1251                                         continue;
1252
1253                                 loaded.Add (key);
1254                         }
1255
1256                         if (corlib_assembly == null) {
1257                                 //
1258                                 // Requires second pass because HasObjectType can trigger assembly load event
1259                                 //
1260                                 for (int i = 0; i < loaded.Count; ++i) {
1261                                         var assembly = loaded [i];
1262
1263                                         //
1264                                         // corlib assembly is the first referenced assembly which contains System.Object
1265                                         //
1266                                         corlib_assembly = HasObjectType (assembly.Item2);
1267                                         if (corlib_assembly != null) {
1268                                                 if (corlib_assembly != assembly.Item2) {
1269                                                         var ca = corlib_assembly;
1270                                                         i = loaded.FindIndex (l => l.Item2 == ca);
1271                                                 }
1272
1273                                                 loaded.RemoveAt (i);
1274                                                 break;
1275                                         }
1276                                 }
1277                         }
1278
1279                         foreach (var entry in module.Compiler.Settings.AssemblyReferencesAliases) {
1280                                 a = LoadAssemblyFile (entry.Item2, false);
1281                                 if (a == null)
1282                                         continue;
1283
1284                                 var key = Tuple.Create (module.CreateRootNamespace (entry.Item1), a);
1285                                 if (loaded.Contains (key))
1286                                         continue;
1287
1288                                 loaded.Add (key);
1289                         }
1290
1291                         if (compiler.Settings.LoadDefaultReferences) {
1292                                 foreach (string r in GetDefaultReferences ()) {
1293                                         a = LoadAssemblyFile (r, true);
1294                                         if (a == null)
1295                                                 continue;
1296
1297                                         var key = Tuple.Create (module.GlobalRootNamespace, a);
1298                                         if (loaded.Contains (key))
1299                                                 continue;
1300
1301                                         loaded.Add (key);
1302                                 }
1303                         }
1304
1305                         compiler.TimeReporter.Stop (TimeReporter.TimerType.ReferencesLoading);
1306                 }
1307         }
1308 }