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 using System.Linq;
  24
  25 #if STATIC
  26 using IKVM.Reflection;
  27 using IKVM.Reflection.Emit;
  28 using SecurityType = System.Collections.Generic.List<IKVM.Reflection.Emit.CustomAttributeBuilder>;
  29 #else
  30 using SecurityType = System.Collections.Generic.Dictionary<System.Security.Permissions.SecurityAction, System.Security.PermissionSet>;
  31 using System.Reflection;
  32 using System.Reflection.Emit;
  33 #endif
  34
  35 namespace Mono.CSharp
  36 {
  37         public interface IAssemblyDefinition
  38         {
  39                 string FullName { get; }
  40                 bool IsCLSCompliant { get; }
  41                 bool IsMissing { get; }
  42                 string Name { get; }
  43
  44                 byte[] GetPublicKeyToken ();
  45                 bool IsFriendAssemblyTo (IAssemblyDefinition assembly);
  46         }
  47
  48         public class AssemblyReferenceErrorInfo
  49         {
  50                 public AssemblyReferenceErrorInfo (AssemblyName dependencyName, string location, string message)
  51                 {
  52                         this.DependencyName = dependencyName;
  53                         this.RequestingAssemblyLocation = location;
  54                         this.Message = message;
  55                 }
  56
  57                 public AssemblyName DependencyName { get; private set; }
  58                 public string RequestingAssemblyLocation { get; private set; }
  59                 public string Message { get; private set; }
  60         }
  61
  62         public abstract class AssemblyDefinition : IAssemblyDefinition
  63         {
  64                 // TODO: make it private and move all builder based methods here
  65                 public AssemblyBuilder Builder;
  66                 protected AssemblyBuilderExtension builder_extra;
  67                 MonoSymbolFile symbol_writer;
  68
  69                 bool is_cls_compliant;
  70                 bool wrap_non_exception_throws;
  71                 bool wrap_non_exception_throws_custom;
  72                 bool has_user_debuggable;
  73
  74                 protected ModuleContainer module;
  75                 readonly string name;
  76                 protected readonly string file_name;
  77
  78                 byte[] public_key, public_key_token;
  79                 bool delay_sign;
  80
  81                 // Holds private/public key pair when private key
  82                 // was available
  83                 StrongNameKeyPair private_key;
  84
  85                 Attribute cls_attribute;
  86                 Method entry_point;
  87
  88                 protected List<ImportedModuleDefinition> added_modules;
  89                 SecurityType declarative_security;
  90                 Dictionary<ITypeDefinition, Attribute> emitted_forwarders;
  91                 AssemblyAttributesPlaceholder module_target_attrs;
  92
  93                 // Win32 version info values
  94                 string vi_product, vi_product_version, vi_company, vi_copyright, vi_trademark;
  95                 string pa_file_version, pa_assembly_version;
  96
  97                 protected AssemblyDefinition (ModuleContainer module, string name)
  98                 {
  99                         this.module = module;
 100                         this.name = Path.GetFileNameWithoutExtension (name);
 101
 102                         wrap_non_exception_throws = true;
 103
 104                         delay_sign = Compiler.Settings.StrongNameDelaySign;
 105
 106                         //
 107                         // Load strong name key early enough for assembly importer to be able to
 108                         // use the keys for InternalsVisibleTo
 109                         // This should go somewhere close to ReferencesLoading but don't have the place yet
 110                         //
 111                         if (Compiler.Settings.HasKeyFileOrContainer) {
 112                                 LoadPublicKey (Compiler.Settings.StrongNameKeyFile, Compiler.Settings.StrongNameKeyContainer);
 113                         }
 114                 }
 115
 116                 protected AssemblyDefinition (ModuleContainer module, string name, string fileName)
 117                         : this (module, name)
 118                 {
 119                         this.file_name = fileName;
 120                 }
 121
 122                 #region Properties
 123
 124                 public Attribute CLSCompliantAttribute {
 125                         get {
 126                                 return cls_attribute;
 127                         }
 128                 }
 129
 130                 public CompilerContext Compiler {
 131                         get {
 132                                 return module.Compiler;
 133                         }
 134                 }
 135
 136                 //
 137                 // Assembly entry point, aka Main method
 138                 //
 139                 public Method EntryPoint {
 140                         get {
 141                                 return entry_point;
 142                         }
 143                         set {
 144                                 entry_point = value;
 145                         }
 146                 }
 147
 148                 public string FullName {
 149                         get {
 150                                 return Builder.FullName;
 151                         }
 152                 }
 153
 154                 public bool HasCLSCompliantAttribute {
 155                         get {
 156                                 return cls_attribute != null;
 157                         }
 158                 }
 159
 160                 // TODO: This should not exist here but will require more changes
 161                 public MetadataImporter Importer {
 162                     get; set;
 163                 }
 164
 165                 public bool IsCLSCompliant {
 166                         get {
 167                                 return is_cls_compliant;
 168                         }
 169                 }
 170
 171                 bool IAssemblyDefinition.IsMissing {
 172                         get {
 173                                 return false;
 174                         }
 175                 }
 176
 177                 public bool IsSatelliteAssembly { get; private set; }
 178
 179                 public string Name {
 180                         get {
 181                                 return name;
 182                         }
 183                 }
 184
 185                 public bool WrapNonExceptionThrows {
 186                         get {
 187                                 return wrap_non_exception_throws;
 188                         }
 189                 }
 190
 191                 protected Report Report {
 192                         get {
 193                                 return Compiler.Report;
 194                         }
 195                 }
 196
 197                 public MonoSymbolFile SymbolWriter {
 198                         get {
 199                                 return symbol_writer;
 200                         }
 201                 }
 202
 203                 #endregion
 204
 205                 public void AddModule (ImportedModuleDefinition module)
 206                 {
 207                         if (added_modules == null) {
 208                                 added_modules = new List<ImportedModuleDefinition> ();
 209                                 added_modules.Add (module);
 210                         }
 211                 }
 212
 213                 public void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 214                 {
 215                         if (a.IsValidSecurityAttribute ()) {
 216                                 a.ExtractSecurityPermissionSet (ctor, ref declarative_security);
 217                                 return;
 218                         }
 219
 220                         if (a.Type == pa.AssemblyCulture) {
 221                                 string value = a.GetString ();
 222                                 if (value == null || value.Length == 0)
 223                                         return;
 224
 225                                 if (Compiler.Settings.Target == Target.Exe) {
 226                                         Report.Error (7059, a.Location, "Executables cannot be satellite assemblies. Remove the attribute or keep it empty");
 227                                         return;
 228                                 }
 229
 230                                 if (value == "neutral")
 231                                         value = "";
 232
 233                                 if (Compiler.Settings.Target == Target.Module) {
 234                                         SetCustomAttribute (ctor, cdata);
 235                                 } else {
 236                                         builder_extra.SetCulture (value, a.Location);
 237                                 }
 238
 239                                 IsSatelliteAssembly = true;
 240                                 return;
 241                         }
 242
 243                         if (a.Type == pa.AssemblyVersion) {
 244                                 string value = a.GetString ();
 245                                 if (value == null || value.Length == 0)
 246                                         return;
 247
 248                                 var vinfo = IsValidAssemblyVersion (value, true);
 249                                 if (vinfo == null) {
 250                                         Report.Error (7034, a.Location, "The specified version string `{0}' does not conform to the required format - major[.minor[.build[.revision]]]",
 251                                                 value);
 252                                         return;
 253                                 }
 254
 255                                 if (Compiler.Settings.Target == Target.Module) {
 256                                         SetCustomAttribute (ctor, cdata);
 257                                 } else {
 258                                         builder_extra.SetVersion (vinfo, a.Location);
 259                                         pa_assembly_version = vinfo.ToString ();
 260                                 }
 261
 262                                 return;
 263                         }
 264
 265                         if (a.Type == pa.AssemblyAlgorithmId) {
 266                                 const int pos = 2; // skip CA header
 267                                 uint alg = (uint) cdata [pos];
 268                                 alg |= ((uint) cdata [pos + 1]) << 8;
 269                                 alg |= ((uint) cdata [pos + 2]) << 16;
 270                                 alg |= ((uint) cdata [pos + 3]) << 24;
 271
 272                                 if (Compiler.Settings.Target == Target.Module) {
 273                                         SetCustomAttribute (ctor, cdata);
 274                                 } else {
 275                                         builder_extra.SetAlgorithmId (alg, a.Location);
 276                                 }
 277
 278                                 return;
 279                         }
 280
 281                         if (a.Type == pa.AssemblyFlags) {
 282                                 const int pos = 2; // skip CA header
 283                                 uint flags = (uint) cdata[pos];
 284                                 flags |= ((uint) cdata [pos + 1]) << 8;
 285                                 flags |= ((uint) cdata [pos + 2]) << 16;
 286                                 flags |= ((uint) cdata [pos + 3]) << 24;
 287
 288                                 // Ignore set PublicKey flag if assembly is not strongnamed
 289                                 if ((flags & (uint) AssemblyNameFlags.PublicKey) != 0 && public_key == null)
 290                                         flags &= ~(uint) AssemblyNameFlags.PublicKey;
 291
 292                                 if (Compiler.Settings.Target == Target.Module) {
 293                                         SetCustomAttribute (ctor, cdata);
 294                                 } else {
 295                                         builder_extra.SetFlags (flags, a.Location);
 296                                 }
 297
 298                                 return;
 299                         }
 300
 301                         if (a.Type == pa.TypeForwarder) {
 302                                 TypeSpec t = a.GetArgumentType ();
 303                                 if (t == null || TypeManager.HasElementType (t)) {
 304                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
 305                                         return;
 306                                 }
 307
 308                                 if (emitted_forwarders == null) {
 309                                         emitted_forwarders = new Dictionary<ITypeDefinition, Attribute> ();
 310                                 } else if (emitted_forwarders.ContainsKey (t.MemberDefinition)) {
 311                                         Report.SymbolRelatedToPreviousError (emitted_forwarders[t.MemberDefinition].Location, null);
 312                                         Report.Error (739, a.Location, "A duplicate type forward of type `{0}'",
 313                                                 t.GetSignatureForError ());
 314                                         return;
 315                                 }
 316
 317                                 emitted_forwarders.Add (t.MemberDefinition, a);
 318
 319                                 if (t.MemberDefinition.DeclaringAssembly == this) {
 320                                         Report.SymbolRelatedToPreviousError (t);
 321                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
 322                                                 t.GetSignatureForError ());
 323                                         return;
 324                                 }
 325
 326                                 if (t.IsNested) {
 327                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
 328                                                 t.GetSignatureForError ());
 329                                         return;
 330                                 }
 331
 332                                 AddTypeForwarders (t, a.Location);
 333                                 return;
 334                         }
 335
 336                         if (a.Type == pa.Extension) {
 337                                 a.Error_MisusedExtensionAttribute ();
 338                                 return;
 339                         }
 340
 341                         if (a.Type == pa.InternalsVisibleTo) {
 342                                 string assembly_name = a.GetString ();
 343                                 if (assembly_name == null) {
 344                                         Report.Error (7030, a.Location, "Friend assembly reference cannot have `null' value");
 345                                         return;
 346                                 }
 347
 348                                 if (assembly_name.Length == 0)
 349                                         return;
 350 #if STATIC
 351                                 ParsedAssemblyName aname;
 352                                 ParseAssemblyResult r = Fusion.ParseAssemblyName (assembly_name, out aname);
 353                                 if (r != ParseAssemblyResult.OK) {
 354                                         Report.Warning (1700, 3, a.Location, "Friend assembly reference `{0}' is invalid and cannot be resolved",
 355                                                 assembly_name);
 356                                         return;
 357                                 }
 358
 359                                 if (aname.Version != null || aname.Culture != null || aname.ProcessorArchitecture != ProcessorArchitecture.None) {
 360                                         Report.Error (1725, a.Location,
 361                                                 "Friend assembly reference `{0}' is invalid. InternalsVisibleTo declarations cannot have a version, culture or processor architecture specified",
 362                                                 assembly_name);
 363
 364                                         return;
 365                                 }
 366
 367                                 if (public_key != null && !aname.HasPublicKey) {
 368                                         Report.Error (1726, a.Location,
 369                                                 "Friend assembly reference `{0}' is invalid. Strong named assemblies must specify a public key in their InternalsVisibleTo declarations",
 370                                                 assembly_name);
 371                                         return;
 372                                 }
 373 #endif
 374                         } else if (a.Type == pa.RuntimeCompatibility) {
 375                                 wrap_non_exception_throws_custom = true;
 376                         } else if (a.Type == pa.AssemblyFileVersion) {
 377                                 pa_file_version = a.GetString ();
 378                                 if (string.IsNullOrEmpty (pa_file_version) || IsValidAssemblyVersion (pa_file_version, false) == null) {
 379                                         Report.Warning (7035, 1, a.Location, "The specified version string `{0}' does not conform to the recommended format major.minor.build.revision",
 380                                                         pa_file_version, a.Name);
 381                                         return;
 382                                 }
 383
 384                                 // File version info decoding from blob is not supported
 385                                 var cab = new CustomAttributeBuilder ((ConstructorInfo)ctor.GetMetaInfo (), new object [] { pa_file_version });
 386                                 Builder.SetCustomAttribute (cab);
 387                                 return;
 388                         } else if (a.Type == pa.AssemblyProduct) {
 389                                 vi_product = a.GetString ();
 390                         } else if (a.Type == pa.AssemblyCompany) {
 391                                 vi_company = a.GetString ();
 392                         } else if (a.Type == pa.AssemblyCopyright) {
 393                                 vi_copyright = a.GetString ();
 394                         } else if (a.Type == pa.AssemblyTrademark) {
 395                                 vi_trademark = a.GetString ();
 396                         } else if (a.Type == pa.Debuggable) {
 397                                 has_user_debuggable = true;
 398                         } else if (a.Type == pa.AssemblyInformationalVersion) {
 399                                 vi_product_version = a.GetString ();
 400                         }
 401
 402                         //
 403                         // Win32 version info attributes AssemblyDescription and AssemblyTitle cannot be
 404                         // set using public API and because we have blob like attributes we need to use
 405                         // special option DecodeVersionInfoAttributeBlobs to support values extraction
 406                         //
 407
 408                         SetCustomAttribute (ctor, cdata);
 409                 }
 410
 411                 void AddTypeForwarders (TypeSpec type, Location loc)
 412                 {
 413                         builder_extra.AddTypeForwarder (type.GetDefinition (), loc);
 414
 415                         var ntypes = MemberCache.GetDeclaredNestedTypes (type);
 416                         if (ntypes == null)
 417                                 return;
 418
 419                         foreach (var nested in ntypes) {
 420                                 if (nested.IsPrivate)
 421                                         continue;
 422
 423                                 AddTypeForwarders (nested, loc);
 424                         }
 425                 }
 426
 427                 //
 428                 // When using assembly public key attributes InternalsVisibleTo key
 429                 // was not checked, we have to do it later when we actually know what
 430                 // our public key token is
 431                 //
 432                 void CheckReferencesPublicToken ()
 433                 {
 434                         var references = builder_extra.GetReferencedAssemblies ();
 435                         foreach (var an in references) {
 436                                 if (public_key != null && an.GetPublicKey ().Length == 0) {
 437                                         Report.Error (1577, "Referenced assembly `{0}' does not have a strong name",
 438                                                 an.FullName);
 439                                 }
 440
 441                                 var ci = an.CultureInfo;
 442                                 if (!ci.Equals (CultureInfo.InvariantCulture)) {
 443                                         Report.Warning (8009, 1, "Referenced assembly `{0}' has different culture setting of `{1}'",
 444                                                 an.Name, ci.Name);
 445                                 }
 446
 447                                 var ia = Importer.GetImportedAssemblyDefinition (an);
 448                                 if (ia == null)
 449                                         continue;
 450
 451                                 var an_references = GetNotUnifiedReferences (an);
 452                                 if (an_references != null) {
 453                                         foreach (var r in an_references) {
 454                                                 //
 455                                                 // Secondary check when assembly references is resolved but not used. For example
 456                                                 // due to type-forwarding
 457                                                 //
 458                                                 if (references.Any (l => l.Name == r.DependencyName.Name)) {
 459                                                         Report.SymbolRelatedToPreviousError (r.RequestingAssemblyLocation);
 460                                                         Report.Error (1705, r.Message);
 461                                                 }
 462                                         }
 463                                 }
 464
 465                                 if (!ia.IsFriendAssemblyTo (this))
 466                                         continue;
 467
 468                                 var attr = ia.GetAssemblyVisibleToName (this);
 469                                 var atoken = attr.GetPublicKeyToken ();
 470
 471                                 if (ArrayComparer.IsEqual (GetPublicKeyToken (), atoken))
 472                                         continue;
 473
 474                                 Report.SymbolRelatedToPreviousError (ia.Location);
 475                                 Report.Error (281,
 476                                         "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",
 477                                         attr.FullName, FullName);
 478                         }
 479                 }
 480
 481                 protected AssemblyName CreateAssemblyName ()
 482                 {
 483                         var an = new AssemblyName (name);
 484
 485                         if (public_key != null && Compiler.Settings.Target != Target.Module) {
 486                                 if (delay_sign) {
 487                                         an.SetPublicKey (public_key);
 488                                 } else {
 489                                         if (public_key.Length == 16) {
 490                                                 Report.Error (1606, "Could not sign the assembly. ECMA key can only be used to delay-sign assemblies");
 491                                         } else if (private_key == null) {
 492                                                 Error_AssemblySigning ("The specified key file does not have a private key");
 493                                         } else {
 494                                                 an.KeyPair = private_key;
 495                                         }
 496                                 }
 497                         }
 498
 499                         return an;
 500                 }
 501
 502                 public virtual ModuleBuilder CreateModuleBuilder ()
 503                 {
 504                         if (file_name == null)
 505                                 throw new NotSupportedException ("transient module in static assembly");
 506
 507                         var module_name = Path.GetFileName (file_name);
 508
 509                         // Always initialize module without symbolInfo. We could be framework dependent
 510                         // but returned ISymbolWriter does not have all what we need therefore some
 511                         // adaptor will be needed for now we alwayas emit MDB format when generating
 512                         // debug info
 513                         return Builder.DefineDynamicModule (module_name, module_name, false);
 514                 }
 515
 516                 public virtual void Emit ()
 517                 {
 518                         if (Compiler.Settings.Target == Target.Module) {
 519                                 module_target_attrs = new AssemblyAttributesPlaceholder (module, name);
 520                                 module_target_attrs.CreateContainer ();
 521                                 module_target_attrs.DefineContainer ();
 522                                 module_target_attrs.Define ();
 523                                 module.AddCompilerGeneratedClass (module_target_attrs);
 524                         } else if (added_modules != null) {
 525                                 ReadModulesAssemblyAttributes ();
 526                         }
 527
 528                         if (Compiler.Settings.GenerateDebugInfo) {
 529                                 symbol_writer = new MonoSymbolFile ();
 530                         }
 531
 532                         module.EmitContainer ();
 533
 534                         if (module.HasExtensionMethod) {
 535                                 var pa = module.PredefinedAttributes.Extension;
 536                                 if (pa.IsDefined) {
 537                                         SetCustomAttribute (pa.Constructor, AttributeEncoder.Empty);
 538                                 }
 539                         }
 540
 541                         if (!IsSatelliteAssembly) {
 542                                 if (!has_user_debuggable && Compiler.Settings.GenerateDebugInfo) {
 543                                         var pa = module.PredefinedAttributes.Debuggable;
 544                                         if (pa.IsDefined) {
 545                                                 var modes = System.Diagnostics.DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints;
 546                                                 if (!Compiler.Settings.Optimize)
 547                                                         modes |= System.Diagnostics.DebuggableAttribute.DebuggingModes.DisableOptimizations;
 548
 549                                                 pa.EmitAttribute (Builder, modes);
 550                                         }
 551                                 }
 552
 553                                 if (!wrap_non_exception_throws_custom) {
 554                                         PredefinedAttribute pa = module.PredefinedAttributes.RuntimeCompatibility;
 555                                         if (pa.IsDefined && pa.ResolveBuilder ()) {
 556                                                 var prop = module.PredefinedMembers.RuntimeCompatibilityWrapNonExceptionThrows.Get ();
 557                                                 if (prop != null) {
 558                                                         AttributeEncoder encoder = new AttributeEncoder ();
 559                                                         encoder.EncodeNamedPropertyArgument (prop, new BoolLiteral (Compiler.BuiltinTypes, true, Location.Null));
 560                                                         SetCustomAttribute (pa.Constructor, encoder.ToArray ());
 561                                                 }
 562                                         }
 563                                 }
 564
 565                                 if (declarative_security != null) {
 566 #if STATIC
 567                                         foreach (var entry in declarative_security) {
 568                                                 Builder.__AddDeclarativeSecurity (entry);
 569                                         }
 570 #else
 571                                         throw new NotSupportedException ("Assembly-level security");
 572 #endif
 573                                 }
 574                         }
 575
 576                         CheckReferencesPublicToken ();
 577
 578                         SetEntryPoint ();
 579                 }
 580
 581                 public byte[] GetPublicKeyToken ()
 582                 {
 583                         if (public_key == null || public_key_token != null)
 584                                 return public_key_token;
 585
 586                         HashAlgorithm ha = SHA1.Create ();
 587                         byte[] hash = ha.ComputeHash (public_key);
 588                         // we need the last 8 bytes in reverse order
 589                         public_key_token = new byte[8];
 590                         Buffer.BlockCopy (hash, hash.Length - 8, public_key_token, 0, 8);
 591                         Array.Reverse (public_key_token, 0, 8);
 592                         return public_key_token;
 593                 }
 594
 595                 protected virtual List<AssemblyReferenceErrorInfo> GetNotUnifiedReferences (AssemblyName assemblyName)
 596                 {
 597                         return null;
 598                 }
 599
 600                 //
 601                 // Either keyFile or keyContainer has to be non-null
 602                 //
 603                 void LoadPublicKey (string keyFile, string keyContainer)
 604                 {
 605                         if (keyContainer != null) {
 606                                 try {
 607                                         private_key = new StrongNameKeyPair (keyContainer);
 608                                         public_key = private_key.PublicKey;
 609                                 } catch {
 610                                         Error_AssemblySigning ("The specified key container `" + keyContainer + "' does not exist");
 611                                 }
 612
 613                                 return;
 614                         }
 615
 616                         bool key_file_exists = File.Exists (keyFile);
 617
 618                         //
 619                         // For attribute based KeyFile do additional lookup
 620                         // in output assembly path
 621                         //
 622                         if (!key_file_exists && Compiler.Settings.StrongNameKeyFile == null) {
 623                                 //
 624                                 // The key file can be relative to output assembly
 625                                 //
 626                                 string test_path = Path.Combine (Path.GetDirectoryName (file_name), keyFile);
 627                                 key_file_exists = File.Exists (test_path);
 628                                 if (key_file_exists)
 629                                         keyFile = test_path;
 630                         }
 631
 632                         if (!key_file_exists) {
 633                                 Error_AssemblySigning ("The specified key file `" + keyFile + "' does not exist");
 634                                 return;
 635                         }
 636
 637                         using (FileStream fs = new FileStream (keyFile, FileMode.Open, FileAccess.Read)) {
 638                                 byte[] snkeypair = new byte[fs.Length];
 639                                 fs.Read (snkeypair, 0, snkeypair.Length);
 640
 641                                 // check for ECMA key
 642                                 if (snkeypair.Length == 16) {
 643                                         public_key = snkeypair;
 644                                         return;
 645                                 }
 646
 647                                 try {
 648                                         // take it, with or without, a private key
 649                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (snkeypair);
 650                                         // and make sure we only feed the public part to Sys.Ref
 651                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
 652
 653                                         // AssemblyName.SetPublicKey requires an additional header
 654                                         byte[] publicKeyHeader = new byte[8] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00 };
 655
 656                                         // Encode public key
 657                                         public_key = new byte[12 + publickey.Length];
 658                                         Buffer.BlockCopy (publicKeyHeader, 0, public_key, 0, publicKeyHeader.Length);
 659
 660                                         // Length of Public Key (in bytes)
 661                                         int lastPart = public_key.Length - 12;
 662                                         public_key[8] = (byte) (lastPart & 0xFF);
 663                                         public_key[9] = (byte) ((lastPart >> 8) & 0xFF);
 664                                         public_key[10] = (byte) ((lastPart >> 16) & 0xFF);
 665                                         public_key[11] = (byte) ((lastPart >> 24) & 0xFF);
 666
 667                                         Buffer.BlockCopy (publickey, 0, public_key, 12, publickey.Length);
 668                                 } catch {
 669                                         Error_AssemblySigning ("The specified key file `" + keyFile + "' has incorrect format");
 670                                         return;
 671                                 }
 672
 673                                 if (delay_sign)
 674                                         return;
 675
 676                                 try {
 677                                         // TODO: Is there better way to test for a private key presence ?
 678                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
 679                                         private_key = new StrongNameKeyPair (snkeypair);
 680                                 } catch { }
 681                         }
 682                 }
 683
 684                 void ReadModulesAssemblyAttributes ()
 685                 {
 686                         foreach (var m in added_modules) {
 687                                 var cattrs = m.ReadAssemblyAttributes ();
 688                                 if (cattrs == null)
 689                                         continue;
 690
 691                                 module.OptAttributes.AddAttributes (cattrs);
 692                         }
 693                 }
 694
 695                 public void Resolve ()
 696                 {
 697                         if (Compiler.Settings.Unsafe && module.PredefinedTypes.SecurityAction.Define ()) {
 698                                 //
 699                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
 700                                 // when -unsafe option was specified
 701                                 //
 702                                 Location loc = Location.Null;
 703
 704                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
 705                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
 706
 707                                 var req_min = module.PredefinedMembers.SecurityActionRequestMinimum.Resolve (loc);
 708
 709                                 Arguments pos = new Arguments (1);
 710                                 pos.Add (new Argument (req_min.GetConstant (null)));
 711
 712                                 Arguments named = new Arguments (1);
 713                                 named.Add (new NamedArgument ("SkipVerification", loc, new BoolLiteral (Compiler.BuiltinTypes, true, loc)));
 714
 715                                 Attribute g = new Attribute ("assembly",
 716                                         new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
 717                                         new Arguments[] { pos, named }, loc, false);
 718                                 g.AttachTo (module, module);
 719
 720                                 // Disable no-location warnings (e.g. obsolete) for compiler generated attribute
 721                                 Compiler.Report.DisableReporting ();
 722                                 try {
 723                                         var ctor = g.Resolve ();
 724                                         if (ctor != null) {
 725                                                 g.ExtractSecurityPermissionSet (ctor, ref declarative_security);
 726                                         }
 727                                 } finally {
 728                                         Compiler.Report.EnableReporting ();
 729                                 }
 730                         }
 731
 732                         if (module.OptAttributes == null)
 733                                 return;
 734
 735                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
 736                         if (!module.OptAttributes.CheckTargets())
 737                                 return;
 738
 739                         cls_attribute = module.ResolveAssemblyAttribute (module.PredefinedAttributes.CLSCompliant);
 740
 741                         if (cls_attribute != null) {
 742                                 is_cls_compliant = cls_attribute.GetClsCompliantAttributeValue ();
 743                         }
 744
 745                         if (added_modules != null && Compiler.Settings.VerifyClsCompliance && is_cls_compliant) {
 746                                 foreach (var m in added_modules) {
 747                                         if (!m.IsCLSCompliant) {
 748                                                 Report.Error (3013,
 749                                                         "Added modules must be marked with the CLSCompliant attribute to match the assembly",
 750                                                         m.Name);
 751                                         }
 752                                 }
 753                         }
 754
 755                         Attribute a = module.ResolveAssemblyAttribute (module.PredefinedAttributes.RuntimeCompatibility);
 756                         if (a != null) {
 757                                 var val = a.GetNamedValue ("WrapNonExceptionThrows") as BoolConstant;
 758                                 if (val != null)
 759                                         wrap_non_exception_throws = val.Value;
 760                         }
 761                 }
 762
 763                 protected void ResolveAssemblySecurityAttributes ()
 764                 {
 765                         string key_file = null;
 766                         string key_container = null;
 767
 768                         if (module.OptAttributes != null) {
 769                                 foreach (Attribute a in module.OptAttributes.Attrs) {
 770                                         // cannot rely on any resolve-based members before you call Resolve
 771                                         if (a.ExplicitTarget != "assembly")
 772                                                 continue;
 773
 774                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
 775                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
 776                                         //       are loaded yet.
 777                                         // TODO: Does not handle quoted attributes properly
 778                                         switch (a.Name) {
 779                                         case "AssemblyKeyFile":
 780                                         case "AssemblyKeyFileAttribute":
 781                                         case "System.Reflection.AssemblyKeyFileAttribute":
 782                                                 if (Compiler.Settings.StrongNameKeyFile != null) {
 783                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 784                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 785                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
 786                                                 } else {
 787                                                         string value = a.GetString ();
 788                                                         if (!string.IsNullOrEmpty (value)) {
 789                                                                 Error_ObsoleteSecurityAttribute (a, "keyfile");
 790                                                                 key_file = value;
 791                                                         }
 792                                                 }
 793                                                 break;
 794                                         case "AssemblyKeyName":
 795                                         case "AssemblyKeyNameAttribute":
 796                                         case "System.Reflection.AssemblyKeyNameAttribute":
 797                                                 if (Compiler.Settings.StrongNameKeyContainer != null) {
 798                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 799                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 800                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
 801                                                 } else {
 802                                                         string value = a.GetString ();
 803                                                         if (!string.IsNullOrEmpty (value)) {
 804                                                                 Error_ObsoleteSecurityAttribute (a, "keycontainer");
 805                                                                 key_container = value;
 806                                                         }
 807                                                 }
 808                                                 break;
 809                                         case "AssemblyDelaySign":
 810                                         case "AssemblyDelaySignAttribute":
 811                                         case "System.Reflection.AssemblyDelaySignAttribute":
 812                                                 bool b = a.GetBoolean ();
 813                                                 if (b) {
 814                                                         Error_ObsoleteSecurityAttribute (a, "delaysign");
 815                                                 }
 816
 817                                                 delay_sign = b;
 818                                                 break;
 819                                         }
 820                                 }
 821                         }
 822
 823                         // We came here only to report assembly attributes warnings
 824                         if (public_key != null)
 825                                 return;
 826
 827                         //
 828                         // Load the strong key file found in attributes when no
 829                         // command line key was given
 830                         //
 831                         if (key_file != null || key_container != null) {
 832                                 LoadPublicKey (key_file, key_container);
 833                         } else if (delay_sign) {
 834                                 Report.Warning (1607, 1, "Delay signing was requested but no key file was given");
 835                         }
 836                 }
 837
 838                 public void EmbedResources ()
 839                 {
 840                         //
 841                         // Add Win32 resources
 842                         //
 843                         if (Compiler.Settings.Win32ResourceFile != null) {
 844                                 Builder.DefineUnmanagedResource (Compiler.Settings.Win32ResourceFile);
 845                         } else {
 846                                 Builder.DefineVersionInfoResource (vi_product,
 847                                                                    vi_product_version ?? pa_file_version ?? pa_assembly_version,
 848                                                                    vi_company,
 849                                                                    vi_copyright,
 850                                                                    vi_trademark);
 851                         }
 852
 853                         if (Compiler.Settings.Win32IconFile != null) {
 854                                 builder_extra.DefineWin32IconResource (Compiler.Settings.Win32IconFile);
 855                         }
 856
 857                         if (Compiler.Settings.Resources != null) {
 858                                 if (Compiler.Settings.Target == Target.Module) {
 859                                         Report.Error (1507, "Cannot link resource file when building a module");
 860                                 } else {
 861                                         int counter = 0;
 862                                         foreach (var res in Compiler.Settings.Resources) {
 863                                                 if (!File.Exists (res.FileName)) {
 864                                                         Report.Error (1566, "Error reading resource file `{0}'", res.FileName);
 865                                                         continue;
 866                                                 }
 867
 868                                                 if (res.IsEmbeded) {
 869                                                         Stream stream;
 870                                                         if (counter++ < 10) {
 871                                                                 stream = File.OpenRead (res.FileName);
 872                                                         } else {
 873                                                                 // TODO: SRE API requires resource stream to be available during AssemblyBuilder::Save
 874                                                                 // we workaround it by reading everything into memory to compile projects with
 875                                                                 // many embedded resource (over 3500) references
 876                                                                 stream = new MemoryStream (File.ReadAllBytes (res.FileName));
 877                                                         }
 878
 879                                                         module.Builder.DefineManifestResource (res.Name, stream, res.Attributes);
 880                                                 } else {
 881                                                         Builder.AddResourceFile (res.Name, Path.GetFileName (res.FileName), res.Attributes);
 882                                                 }
 883                                         }
 884                                 }
 885                         }
 886                 }
 887
 888                 public void Save ()
 889                 {
 890                         PortableExecutableKinds pekind = PortableExecutableKinds.ILOnly;
 891                         ImageFileMachine machine;
 892
 893                         switch (Compiler.Settings.Platform) {
 894                         case Platform.X86:
 895                                 pekind |= PortableExecutableKinds.Required32Bit;
 896                                 machine = ImageFileMachine.I386;
 897                                 break;
 898                         case Platform.X64:
 899                                 pekind |= PortableExecutableKinds.PE32Plus;
 900                                 machine = ImageFileMachine.AMD64;
 901                                 break;
 902                         case Platform.IA64:
 903                                 machine = ImageFileMachine.IA64;
 904                                 break;
 905                         case Platform.AnyCPU32Preferred:
 906 #if STATIC
 907                                 pekind |= PortableExecutableKinds.Preferred32Bit;
 908                                 machine = ImageFileMachine.I386;
 909                                 break;
 910 #else
 911                                 throw new NotSupportedException ();
 912 #endif
 913                         case Platform.Arm:
 914 #if STATIC
 915                                 machine = ImageFileMachine.ARM;
 916                                 break;
 917 #else
 918                                 throw new NotSupportedException ();
 919 #endif
 920                         case Platform.AnyCPU:
 921                         default:
 922                                 machine = ImageFileMachine.I386;
 923                                 break;
 924                         }
 925
 926                         Compiler.TimeReporter.Start (TimeReporter.TimerType.OutputSave);
 927                         try {
 928                                 if (Compiler.Settings.Target == Target.Module) {
 929                                         SaveModule (pekind, machine);
 930                                 } else {
 931                                         Builder.Save (module.Builder.ScopeName, pekind, machine);
 932                                 }
 933                         } catch (ArgumentOutOfRangeException) {
 934                                 Report.Error (16, "Output file `{0}' exceeds the 4GB limit", name);
 935                         } catch (Exception e) {
 936                                 Report.Error (16, "Could not write to file `{0}'. {1}", name, e.Message);
 937                         }
 938                         Compiler.TimeReporter.Stop (TimeReporter.TimerType.OutputSave);
 939
 940                         // Save debug symbols file
 941                         if (symbol_writer != null && Compiler.Report.Errors == 0) {
 942                                 // TODO: it should run in parallel
 943                                 Compiler.TimeReporter.Start (TimeReporter.TimerType.DebugSave);
 944
 945                                 var filename = file_name + ".mdb";
 946                                 try {
 947                                         // We mmap the file, so unlink the previous version since it may be in use
 948                                         File.Delete (filename);
 949                                 } catch {
 950                                         // We can safely ignore
 951                                 }
 952
 953                                 module.WriteDebugSymbol (symbol_writer);
 954
 955                                 using (FileStream fs = new FileStream (filename, FileMode.Create, FileAccess.Write)) {
 956                                         symbol_writer.CreateSymbolFile (module.Builder.ModuleVersionId, fs);
 957                                 }
 958
 959                                 Compiler.TimeReporter.Stop (TimeReporter.TimerType.DebugSave);
 960                         }
 961                 }
 962
 963                 protected virtual void SaveModule (PortableExecutableKinds pekind, ImageFileMachine machine)
 964                 {
 965                         Report.RuntimeMissingSupport (Location.Null, "-target:module");
 966                 }
 967
 968                 void SetCustomAttribute (MethodSpec ctor, byte[] data)
 969                 {
 970                         if (module_target_attrs != null)
 971                                 module_target_attrs.AddAssemblyAttribute (ctor, data);
 972                         else
 973                                 Builder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), data);
 974                 }
 975
 976                 void SetEntryPoint ()
 977                 {
 978                         if (!Compiler.Settings.NeedsEntryPoint) {
 979                                 if (Compiler.Settings.MainClass != null)
 980                                         Report.Error (2017, "Cannot specify -main if building a module or library");
 981
 982                                 return;
 983                         }
 984
 985                         PEFileKinds file_kind;
 986
 987                         switch (Compiler.Settings.Target) {
 988                         case Target.Library:
 989                         case Target.Module:
 990                                 file_kind = PEFileKinds.Dll;
 991                                 break;
 992                         case Target.WinExe:
 993                                 file_kind = PEFileKinds.WindowApplication;
 994                                 break;
 995                         default:
 996                                 file_kind = PEFileKinds.ConsoleApplication;
 997                                 break;
 998                         }
 999
1000                         if (entry_point == null) {
1001                                 string main_class = Compiler.Settings.MainClass;
1002                                 if (main_class != null) {
1003                                         // TODO: Handle dotted names
1004                                         var texpr = module.GlobalRootNamespace.LookupType (module, main_class, 0, LookupMode.Probing, Location.Null);
1005                                         if (texpr == null) {
1006                                                 Report.Error (1555, "Could not find `{0}' specified for Main method", main_class);
1007                                                 return;
1008                                         }
1009
1010                                         var mtype = texpr.MemberDefinition as ClassOrStruct;
1011                                         if (mtype == null) {
1012                                                 Report.Error (1556, "`{0}' specified for Main method must be a valid class or struct", main_class);
1013                                                 return;
1014                                         }
1015
1016                                         Report.Error (1558, mtype.Location, "`{0}' does not have a suitable static Main method", mtype.GetSignatureForError ());
1017                                 } else {
1018                                         string pname = file_name == null ? name : Path.GetFileName (file_name);
1019                                         Report.Error (5001, "Program `{0}' does not contain a static `Main' method suitable for an entry point",
1020                                                 pname);
1021                                 }
1022
1023                                 return;
1024                         }
1025
1026                         Builder.SetEntryPoint (entry_point.MethodBuilder, file_kind);
1027                 }
1028
1029                 void Error_ObsoleteSecurityAttribute (Attribute a, string option)
1030                 {
1031                         Report.Warning (1699, 1, a.Location,
1032                                 "Use compiler option `{0}' or appropriate project settings instead of `{1}' attribute",
1033                                 option, a.Name);
1034                 }
1035
1036                 void Error_AssemblySigning (string text)
1037                 {
1038                         Report.Error (1548, "Error during assembly signing. " + text);
1039                 }
1040
1041                 public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
1042                 {
1043                         return false;
1044                 }
1045
1046                 static Version IsValidAssemblyVersion (string version, bool allowGenerated)
1047                 {
1048                         string[] parts = version.Split ('.');
1049                         if (parts.Length < 1 || parts.Length > 4)
1050                                 return null;
1051
1052                         var values = new int[4];
1053                         for (int i = 0; i < parts.Length; ++i) {
1054                                 if (!int.TryParse (parts[i], out values[i])) {
1055                                         if (parts[i].Length == 1 && parts[i][0] == '*' && allowGenerated) {
1056                                                 if (i == 2) {
1057                                                         // Nothing can follow *
1058                                                         if (parts.Length > 3)
1059                                                                 return null;
1060
1061                                                         // Generate Build value based on days since 1/1/2000
1062                                                         TimeSpan days = DateTime.Today - new DateTime (2000, 1, 1);
1063                                                         values[i] = System.Math.Max (days.Days, 0);
1064                                                         i = 3;
1065                                                 }
1066
1067                                                 if (i == 3) {
1068                                                         // Generate Revision value based on every other second today
1069                                                         var seconds = DateTime.Now - DateTime.Today;
1070                                                         values[i] = (int) seconds.TotalSeconds / 2;
1071                                                         continue;
1072                                                 }
1073                                         }
1074
1075                                         return null;
1076                                 }
1077
1078                                 if (values[i] > ushort.MaxValue)
1079                                         return null;
1080                         }
1081
1082                         return new Version (values[0], values[1], values[2], values[3]);
1083                 }
1084         }
1085
1086         public class AssemblyResource : IEquatable<AssemblyResource>
1087         {
1088                 public AssemblyResource (string fileName, string name)
1089                         : this (fileName, name, false)
1090                 {
1091                 }
1092
1093                 public AssemblyResource (string fileName, string name, bool isPrivate)
1094                 {
1095                         FileName = fileName;
1096                         Name = name;
1097                         Attributes = isPrivate ? ResourceAttributes.Private : ResourceAttributes.Public;
1098                 }
1099
1100                 public ResourceAttributes Attributes { get; private set; }
1101                 public string Name { get; private set; }
1102                 public string FileName { get; private set; }
1103                 public bool IsEmbeded { get; set; }
1104
1105                 #region IEquatable<AssemblyResource> Members
1106
1107                 public bool Equals (AssemblyResource other)
1108                 {
1109                         return Name == other.Name;
1110                 }
1111
1112                 #endregion
1113         }
1114
1115         //
1116         // A placeholder class for assembly attributes when emitting module
1117         //
1118         class AssemblyAttributesPlaceholder : CompilerGeneratedContainer
1119         {
1120                 static readonly string TypeNamePrefix = "<$AssemblyAttributes${0}>";
1121                 public static readonly string AssemblyFieldName = "attributes";
1122
1123                 Field assembly;
1124
1125                 public AssemblyAttributesPlaceholder (ModuleContainer parent, string outputName)
1126                         : base (parent, new MemberName (GetGeneratedName (outputName)), Modifiers.STATIC | Modifiers.INTERNAL)
1127                 {
1128                         assembly = new Field (this, new TypeExpression (parent.Compiler.BuiltinTypes.Object, Location), Modifiers.PUBLIC | Modifiers.STATIC,
1129                                 new MemberName (AssemblyFieldName), null);
1130
1131                         AddField (assembly);
1132                 }
1133
1134                 public void AddAssemblyAttribute (MethodSpec ctor, byte[] data)
1135                 {
1136                         assembly.SetCustomAttribute (ctor, data);
1137                 }
1138
1139                 public static string GetGeneratedName (string outputName)
1140                 {
1141                         return string.Format (TypeNamePrefix, outputName);
1142                 }
1143         }
1144
1145         //
1146         // Extension to System.Reflection.Emit.AssemblyBuilder to have fully compatible
1147         // compiler. This is a default implementation for framework System.Reflection.Emit
1148         // which does not implement any of the methods
1149         //
1150         public class AssemblyBuilderExtension
1151         {
1152                 protected readonly CompilerContext ctx;
1153
1154                 public AssemblyBuilderExtension (CompilerContext ctx)
1155                 {
1156                         this.ctx = ctx;
1157                 }
1158
1159                 public virtual System.Reflection.Module AddModule (string module)
1160                 {
1161                         ctx.Report.RuntimeMissingSupport (Location.Null, "-addmodule");
1162                         return null;
1163                 }
1164
1165                 public virtual void AddPermissionRequests (PermissionSet[] permissions)
1166                 {
1167                         ctx.Report.RuntimeMissingSupport (Location.Null, "assembly declarative security");
1168                 }
1169
1170                 public virtual void AddTypeForwarder (TypeSpec type, Location loc)
1171                 {
1172                         ctx.Report.RuntimeMissingSupport (loc, "TypeForwardedToAttribute");
1173                 }
1174
1175                 public virtual void DefineWin32IconResource (string fileName)
1176                 {
1177                         ctx.Report.RuntimeMissingSupport (Location.Null, "-win32icon");
1178                 }
1179
1180                 public virtual AssemblyName[] GetReferencedAssemblies ()
1181                 {
1182                         return null;
1183                 }
1184
1185                 public virtual void SetAlgorithmId (uint value, Location loc)
1186                 {
1187                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyAlgorithmIdAttribute");
1188                 }
1189
1190                 public virtual void SetCulture (string culture, Location loc)
1191                 {
1192                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyCultureAttribute");
1193                 }
1194
1195                 public virtual void SetFlags (uint flags, Location loc)
1196                 {
1197                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyFlagsAttribute");
1198                 }
1199
1200                 public virtual void SetVersion (Version version, Location loc)
1201                 {
1202                         ctx.Report.RuntimeMissingSupport (loc, "AssemblyVersionAttribute");
1203                 }
1204         }
1205
1206         abstract class AssemblyReferencesLoader<T> where T : class
1207         {
1208                 protected readonly CompilerContext compiler;
1209
1210                 protected readonly List<string> paths;
1211
1212                 protected AssemblyReferencesLoader (CompilerContext compiler)
1213                 {
1214                         this.compiler = compiler;
1215
1216                         paths = new List<string> ();
1217                         paths.Add (Directory.GetCurrentDirectory ());
1218                         paths.AddRange (compiler.Settings.ReferencesLookupPaths);
1219                 }
1220
1221                 public abstract T HasObjectType (T assembly);
1222                 protected abstract string[] GetDefaultReferences ();
1223                 public abstract T LoadAssemblyFile (string fileName, bool isImplicitReference);
1224                 public abstract void LoadReferences (ModuleContainer module);
1225
1226                 protected void Error_FileNotFound (string fileName)
1227                 {
1228                         compiler.Report.Error (6, "Metadata file `{0}' could not be found", fileName);
1229                 }
1230
1231                 protected void Error_FileCorrupted (string fileName)
1232                 {
1233                         compiler.Report.Error (9, "Metadata file `{0}' does not contain valid metadata", fileName);
1234                 }
1235
1236                 protected void Error_AssemblyIsModule (string fileName)
1237                 {
1238                         compiler.Report.Error (1509,
1239                                 "Referenced assembly file `{0}' is a module. Consider using `-addmodule' option to add the module",
1240                                 fileName);
1241                 }
1242
1243                 protected void Error_ModuleIsAssembly (string fileName)
1244                 {
1245                         compiler.Report.Error (1542,
1246                                 "Added module file `{0}' is an assembly. Consider using `-r' option to reference the file",
1247                                 fileName);
1248                 }
1249
1250                 protected void LoadReferencesCore (ModuleContainer module, out T corlib_assembly, out List<Tuple<RootNamespace, T>> loaded)
1251                 {
1252                         compiler.TimeReporter.Start (TimeReporter.TimerType.ReferencesLoading);
1253
1254                         loaded = new List<Tuple<RootNamespace, T>> ();
1255
1256                         //
1257                         // Load mscorlib.dll as the first
1258                         //
1259                         if (module.Compiler.Settings.StdLib) {
1260                                 corlib_assembly = LoadAssemblyFile ("mscorlib.dll", true);
1261                         } else {
1262                                 corlib_assembly = default (T);
1263                         }
1264
1265                         T a;
1266                         foreach (string r in module.Compiler.Settings.AssemblyReferences) {
1267                                 a = LoadAssemblyFile (r, false);
1268                                 if (a == null || EqualityComparer<T>.Default.Equals (a, corlib_assembly))
1269                                         continue;
1270
1271                                 var key = Tuple.Create (module.GlobalRootNamespace, a);
1272                                 if (loaded.Contains (key))
1273                                         continue;
1274
1275                                 loaded.Add (key);
1276                         }
1277
1278                         if (corlib_assembly == null) {
1279                                 //
1280                                 // Requires second pass because HasObjectType can trigger assembly load event
1281                                 //
1282                                 for (int i = 0; i < loaded.Count; ++i) {
1283                                         var assembly = loaded [i];
1284
1285                                         //
1286                                         // corlib assembly is the first referenced assembly which contains System.Object
1287                                         //
1288                                         corlib_assembly = HasObjectType (assembly.Item2);
1289                                         if (corlib_assembly != null) {
1290                                                 if (corlib_assembly != assembly.Item2) {
1291                                                         var ca = corlib_assembly;
1292                                                         i = loaded.FindIndex (l => l.Item2 == ca);
1293                                                 }
1294
1295                                                 loaded.RemoveAt (i);
1296                                                 break;
1297                                         }
1298                                 }
1299                         }
1300
1301                         foreach (var entry in module.Compiler.Settings.AssemblyReferencesAliases) {
1302                                 a = LoadAssemblyFile (entry.Item2, false);
1303                                 if (a == null)
1304                                         continue;
1305
1306                                 var key = Tuple.Create (module.CreateRootNamespace (entry.Item1), a);
1307                                 if (loaded.Contains (key))
1308                                         continue;
1309
1310                                 loaded.Add (key);
1311                         }
1312
1313                         if (compiler.Settings.LoadDefaultReferences) {
1314                                 foreach (string r in GetDefaultReferences ()) {
1315                                         a = LoadAssemblyFile (r, true);
1316                                         if (a == null)
1317                                                 continue;
1318
1319                                         var key = Tuple.Create (module.GlobalRootNamespace, a);
1320                                         if (loaded.Contains (key))
1321                                                 continue;
1322
1323                                         loaded.Add (key);
1324                                 }
1325                         }
1326
1327                         compiler.TimeReporter.Stop (TimeReporter.TimerType.ReferencesLoading);
1328                 }
1329         }
1330 }