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