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