mcs/mcs/codegen.cs

   1 //
   2 // codegen.cs: The code generator
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // Copyright 2001, 2002, 2003 Ximian, Inc.
   8 // Copyright 2004 Novell, Inc.
   9 //
  10
  11 //
  12 // Please leave this defined on SVN: The idea is that when we ship the
  13 // compiler to end users, if the compiler crashes, they have a chance
  14 // to narrow down the problem.
  15 //
  16 // Only remove it if you need to debug locally on your tree.
  17 //
  18 //#define PRODUCTION
  19
  20 using System;
  21 using System.IO;
  22 using System.Collections.Generic;
  23 using System.Globalization;
  24 using System.Reflection;
  25 using System.Reflection.Emit;
  26 using System.Runtime.InteropServices;
  27 using System.Security;
  28 using System.Security.Cryptography;
  29 using System.Security.Permissions;
  30
  31 using Mono.Security.Cryptography;
  32
  33 namespace Mono.CSharp {
  34
  35         /// <summary>
  36         ///    Code generator class.
  37         /// </summary>
  38         public class CodeGen {
  39                 static AppDomain current_domain;
  40
  41                 public static AssemblyClass Assembly;
  42
  43                 static CodeGen ()
  44                 {
  45                         Reset ();
  46                 }
  47
  48                 public static void Reset ()
  49                 {
  50                         Assembly = new AssemblyClass ();
  51                 }
  52
  53                 public static string Basename (string name)
  54                 {
  55                         int pos = name.LastIndexOf ('/');
  56
  57                         if (pos != -1)
  58                                 return name.Substring (pos + 1);
  59
  60                         pos = name.LastIndexOf ('\\');
  61                         if (pos != -1)
  62                                 return name.Substring (pos + 1);
  63
  64                         return name;
  65                 }
  66
  67                 public static string Dirname (string name)
  68                 {
  69                         int pos = name.LastIndexOf ('/');
  70
  71                         if (pos != -1)
  72                                 return name.Substring (0, pos);
  73
  74                         pos = name.LastIndexOf ('\\');
  75                         if (pos != -1)
  76                                 return name.Substring (0, pos);
  77
  78                         return ".";
  79                 }
  80
  81                 static public string FileName;
  82
  83 #if MS_COMPATIBLE
  84                 const AssemblyBuilderAccess COMPILER_ACCESS = 0;
  85 #else
  86                 /* Keep this in sync with System.Reflection.Emit.AssemblyBuilder */
  87                 const AssemblyBuilderAccess COMPILER_ACCESS = (AssemblyBuilderAccess) 0x800;
  88 #endif
  89
  90                 //
  91                 // Initializes the code generator variables for interactive use (repl)
  92                 //
  93                 static public void InitDynamic (CompilerContext ctx, string name)
  94                 {
  95                         current_domain = AppDomain.CurrentDomain;
  96                         AssemblyName an = Assembly.GetAssemblyName (name, name);
  97
  98                         Assembly.Builder = current_domain.DefineDynamicAssembly (an, AssemblyBuilderAccess.Run | COMPILER_ACCESS);
  99                         RootContext.ToplevelTypes = new ModuleCompiled (ctx, true);
 100                         RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (Basename (name), false);
 101                         Assembly.Name = Assembly.Builder.GetName ();
 102                 }
 103
 104                 //
 105                 // Initializes the code generator variables
 106                 //
 107                 static public bool Init (string name, string output, bool want_debugging_support, CompilerContext ctx)
 108                 {
 109                         FileName = output;
 110                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 111                         if (an == null)
 112                                 return false;
 113
 114                         if (an.KeyPair != null) {
 115                                 // If we are going to strong name our assembly make
 116                                 // sure all its refs are strong named
 117                                 foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
 118                                         AssemblyName ref_name = a.GetName ();
 119                                         byte [] b = ref_name.GetPublicKeyToken ();
 120                                         if (b == null || b.Length == 0) {
 121                                                 ctx.Report.Error (1577, "Assembly generation failed " +
 122                                                                 "-- Referenced assembly '" +
 123                                                                 ref_name.Name +
 124                                                                 "' does not have a strong name.");
 125                                                 //Environment.Exit (1);
 126                                         }
 127                                 }
 128                         }
 129
 130                         current_domain = AppDomain.CurrentDomain;
 131
 132                         try {
 133                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 134                                         AssemblyBuilderAccess.RunAndSave | COMPILER_ACCESS, Dirname (name));
 135                         }
 136                         catch (ArgumentException) {
 137                                 // specified key may not be exportable outside it's container
 138                                 if (RootContext.StrongNameKeyContainer != null) {
 139                                         ctx.Report.Error (1548, "Could not access the key inside the container `" +
 140                                                 RootContext.StrongNameKeyContainer + "'.");
 141                                         Environment.Exit (1);
 142                                 }
 143                                 throw;
 144                         }
 145                         catch (CryptographicException) {
 146                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 147                                         ctx.Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 148                                         Environment.Exit (1);
 149                                 }
 150                                 return false;
 151                         }
 152
 153                         // Get the complete AssemblyName from the builder
 154                         // (We need to get the public key and token)
 155                         Assembly.Name = Assembly.Builder.GetName ();
 156
 157                         //
 158                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 159                         // this copes with output in different directories then.
 160                         // FIXME: figure out how this copes with --output /tmp/blah
 161                         //
 162                         // If the third argument is true, the ModuleBuilder will dynamically
 163                         // load the default symbol writer.
 164                         //
 165                         try {
 166                                 RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (
 167                                         Basename (name), Basename (output), want_debugging_support);
 168
 169 #if !MS_COMPATIBLE
 170                                 // TODO: We should use SymbolWriter from DefineDynamicModule
 171                                 if (want_debugging_support && !SymbolWriter.Initialize (RootContext.ToplevelTypes.Builder, output)) {
 172                                         ctx.Report.Error (40, "Unexpected debug information initialization error `{0}'",
 173                                                 "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll)");
 174                                         return false;
 175                                 }
 176 #endif
 177                         } catch (ExecutionEngineException e) {
 178                                 ctx.Report.Error (40, "Unexpected debug information initialization error `{0}'",
 179                                         e.Message);
 180                                 return false;
 181                         }
 182
 183                         return true;
 184                 }
 185
 186                 static public void Save (string name, bool saveDebugInfo, Report Report)
 187                 {
 188                         PortableExecutableKinds pekind;
 189                         ImageFileMachine machine;
 190
 191                         switch (RootContext.Platform) {
 192                         case Platform.X86:
 193                                 pekind = PortableExecutableKinds.Required32Bit;
 194                                 machine = ImageFileMachine.I386;
 195                                 break;
 196                         case Platform.X64:
 197                                 pekind = PortableExecutableKinds.PE32Plus;
 198                                 machine = ImageFileMachine.AMD64;
 199                                 break;
 200                         case Platform.IA64:
 201                                 pekind = PortableExecutableKinds.PE32Plus;
 202                                 machine = ImageFileMachine.IA64;
 203                                 break;
 204                         case Platform.AnyCPU:
 205                         default:
 206                                 pekind = PortableExecutableKinds.ILOnly;
 207                                 machine = ImageFileMachine.I386;
 208                                 break;
 209                         }
 210                         try {
 211                                 Assembly.Builder.Save (Basename (name), pekind, machine);
 212                         }
 213                         catch (COMException) {
 214                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 215                                         throw;
 216
 217                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 218                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 219                                         RootContext.StrongNameKeyFile +
 220                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 221                         }
 222                         catch (System.IO.IOException io) {
 223                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 224                                 return;
 225                         }
 226                         catch (System.UnauthorizedAccessException ua) {
 227                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 228                                 return;
 229                         }
 230                         catch (System.NotImplementedException nie) {
 231                                 Report.RuntimeMissingSupport (Location.Null, nie.Message);
 232                                 return;
 233                         }
 234
 235                         //
 236                         // Write debuger symbol file
 237                         //
 238                         if (saveDebugInfo)
 239                                 SymbolWriter.WriteSymbolFile ();
 240                         }
 241         }
 242
 243         /// <summary>
 244         ///   An Emit Context is created for each body of code (from methods,
 245         ///   properties bodies, indexer bodies or constructor bodies)
 246         /// </summary>
 247         public class EmitContext : BuilderContext
 248         {
 249                 public ILGenerator ig;
 250
 251                 /// <summary>
 252                 ///   The value that is allowed to be returned or NULL if there is no
 253                 ///   return type.
 254                 /// </summary>
 255                 Type return_type;
 256
 257                 /// <summary>
 258                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 259                 ///   to store structures (used to compute the address of the structure
 260                 ///   value on structure method invocations)
 261                 /// </summary>
 262                 Dictionary<Type, object> temporary_storage;
 263
 264                 /// <summary>
 265                 ///   The location where we store the return value.
 266                 /// </summary>
 267                 public LocalBuilder return_value;
 268
 269                 /// <summary>
 270                 ///   The location where return has to jump to return the
 271                 ///   value
 272                 /// </summary>
 273                 public Label ReturnLabel;
 274
 275                 /// <summary>
 276                 ///   If we already defined the ReturnLabel
 277                 /// </summary>
 278                 public bool HasReturnLabel;
 279
 280                 /// <summary>
 281                 ///  Whether we are inside an anonymous method.
 282                 /// </summary>
 283                 public AnonymousExpression CurrentAnonymousMethod;
 284
 285                 public readonly IMemberContext MemberContext;
 286
 287                 public EmitContext (IMemberContext rc, ILGenerator ig, Type return_type)
 288                 {
 289                         this.MemberContext = rc;
 290                         this.ig = ig;
 291
 292                         this.return_type = return_type;
 293                 }
 294
 295                 public Type CurrentType {
 296                         get { return MemberContext.CurrentType; }
 297                 }
 298
 299                 public TypeParameter[] CurrentTypeParameters {
 300                         get { return MemberContext.CurrentTypeParameters; }
 301                 }
 302
 303                 public TypeContainer CurrentTypeDefinition {
 304                         get { return MemberContext.CurrentTypeDefinition; }
 305                 }
 306
 307                 public bool IsStatic {
 308                         get { return MemberContext.IsStatic; }
 309                 }
 310
 311                 // Has to be used for emitter errors only
 312                 public Report Report {
 313                         get { return MemberContext.Compiler.Report; }
 314                 }
 315
 316                 public Type ReturnType {
 317                         get {
 318                                 return return_type;
 319                         }
 320                 }
 321
 322                 /// <summary>
 323                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 324                 ///   writer to which source line this opcode belongs.
 325                 /// </summary>
 326                 public void Mark (Location loc)
 327                 {
 328                         if (!SymbolWriter.HasSymbolWriter || HasSet (Options.OmitDebugInfo) || loc.IsNull)
 329                                 return;
 330
 331                         SymbolWriter.MarkSequencePoint (ig, loc);
 332                 }
 333
 334                 public void DefineLocalVariable (string name, LocalBuilder builder)
 335                 {
 336                         SymbolWriter.DefineLocalVariable (name, builder);
 337                 }
 338
 339                 public void BeginScope ()
 340                 {
 341                         ig.BeginScope();
 342                         SymbolWriter.OpenScope(ig);
 343                 }
 344
 345                 public void EndScope ()
 346                 {
 347                         ig.EndScope();
 348                         SymbolWriter.CloseScope(ig);
 349                 }
 350
 351                 /// <summary>
 352                 ///   Returns a temporary storage for a variable of type t as
 353                 ///   a local variable in the current body.
 354                 /// </summary>
 355                 public LocalBuilder GetTemporaryLocal (Type t)
 356                 {
 357                         if (temporary_storage != null) {
 358                                 object o;
 359                                 if (temporary_storage.TryGetValue (t, out o)) {
 360                                         if (o is Stack<LocalBuilder>) {
 361                                                 var s = (Stack<LocalBuilder>) o;
 362                                                 o = s.Count == 0 ? null : s.Pop ();
 363                                         } else {
 364                                                 temporary_storage.Remove (t);
 365                                         }
 366                                 }
 367                                 if (o != null)
 368                                         return (LocalBuilder) o;
 369                         }
 370                         return ig.DeclareLocal (TypeManager.TypeToReflectionType (t));
 371                 }
 372
 373                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 374                 {
 375                         if (temporary_storage == null) {
 376                                 temporary_storage = new Dictionary<Type, object> (ReferenceEquality<Type>.Default);
 377                                 temporary_storage.Add (t, b);
 378                                 return;
 379                         }
 380                         object o;
 381
 382                         if (!temporary_storage.TryGetValue (t, out o)) {
 383                                 temporary_storage.Add (t, b);
 384                                 return;
 385                         }
 386                         var s = o as Stack<LocalBuilder>;
 387                         if (s == null) {
 388                                 s = new Stack<LocalBuilder> ();
 389                                 s.Push ((LocalBuilder)o);
 390                                 temporary_storage [t] = s;
 391                         }
 392                         s.Push (b);
 393                 }
 394
 395                 /// <summary>
 396                 ///   Current loop begin and end labels.
 397                 /// </summary>
 398                 public Label LoopBegin, LoopEnd;
 399
 400                 /// <summary>
 401                 ///   Default target in a switch statement.   Only valid if
 402                 ///   InSwitch is true
 403                 /// </summary>
 404                 public Label DefaultTarget;
 405
 406                 /// <summary>
 407                 ///   If this is non-null, points to the current switch statement
 408                 /// </summary>
 409                 public Switch Switch;
 410
 411                 /// <summary>
 412                 ///   ReturnValue creates on demand the LocalBuilder for the
 413                 ///   return value from the function.  By default this is not
 414                 ///   used.  This is only required when returns are found inside
 415                 ///   Try or Catch statements.
 416                 ///
 417                 ///   This method is typically invoked from the Emit phase, so
 418                 ///   we allow the creation of a return label if it was not
 419                 ///   requested during the resolution phase.   Could be cleaned
 420                 ///   up, but it would replicate a lot of logic in the Emit phase
 421                 ///   of the code that uses it.
 422                 /// </summary>
 423                 public LocalBuilder TemporaryReturn ()
 424                 {
 425                         if (return_value == null){
 426                                 return_value = ig.DeclareLocal (return_type);
 427                                 if (!HasReturnLabel){
 428                                         ReturnLabel = ig.DefineLabel ();
 429                                         HasReturnLabel = true;
 430                                 }
 431                         }
 432
 433                         return return_value;
 434                 }
 435         }
 436
 437         public abstract class CommonAssemblyModulClass : Attributable, IMemberContext
 438         {
 439                 public void AddAttributes (List<Attribute> attrs, IMemberContext context)
 440                 {
 441                         foreach (Attribute a in attrs)
 442                                 a.AttachTo (this, context);
 443
 444                         if (attributes == null) {
 445                                 attributes = new Attributes (attrs);
 446                                 return;
 447                         }
 448                         attributes.AddAttributes (attrs);
 449                 }
 450
 451                 public virtual void Emit (TypeContainer tc)
 452                 {
 453                         if (OptAttributes == null)
 454                                 return;
 455
 456                         OptAttributes.Emit ();
 457                 }
 458
 459                 protected Attribute ResolveAttribute (PredefinedAttribute a_type)
 460                 {
 461                         Attribute a = OptAttributes.Search (a_type);
 462                         if (a != null) {
 463                                 a.Resolve ();
 464                         }
 465                         return a;
 466                 }
 467
 468                 #region IMemberContext Members
 469
 470                 public CompilerContext Compiler {
 471                         get { return RootContext.ToplevelTypes.Compiler; }
 472                 }
 473
 474                 public Type CurrentType {
 475                         get { return null; }
 476                 }
 477
 478                 public TypeParameter[] CurrentTypeParameters {
 479                         get { return null; }
 480                 }
 481
 482                 public TypeContainer CurrentTypeDefinition {
 483                         get { return RootContext.ToplevelTypes; }
 484                 }
 485
 486                 public string GetSignatureForError ()
 487                 {
 488                         return "<module>";
 489                 }
 490
 491                 public bool IsObsolete {
 492                         get { return false; }
 493                 }
 494
 495                 public bool IsUnsafe {
 496                         get { return false; }
 497                 }
 498
 499                 public bool IsStatic {
 500                         get { return false; }
 501                 }
 502
 503                 public ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
 504                 {
 505                         throw new NotImplementedException ();
 506                 }
 507
 508                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
 509                 {
 510                         return RootContext.ToplevelTypes.LookupNamespaceOrType (name, loc, ignore_cs0104);
 511                 }
 512
 513                 public FullNamedExpression LookupNamespaceAlias (string name)
 514                 {
 515                         return null;
 516                 }
 517
 518                 #endregion
 519         }
 520
 521         public class AssemblyClass : CommonAssemblyModulClass {
 522                 // TODO: make it private and move all builder based methods here
 523                 public AssemblyBuilder Builder;
 524                 bool is_cls_compliant;
 525                 bool wrap_non_exception_throws;
 526
 527                 public Attribute ClsCompliantAttribute;
 528
 529                 Dictionary<SecurityAction, PermissionSet> declarative_security;
 530                 bool has_extension_method;
 531                 public AssemblyName Name;
 532                 MethodInfo add_type_forwarder;
 533                 Dictionary<Type, Attribute> emitted_forwarders;
 534
 535                 // Module is here just because of error messages
 536                 static string[] attribute_targets = new string [] { "assembly", "module" };
 537
 538                 public AssemblyClass ()
 539                 {
 540                         wrap_non_exception_throws = true;
 541                 }
 542
 543                 public bool HasExtensionMethods {
 544                         set {
 545                                 has_extension_method = value;
 546                         }
 547                 }
 548
 549                 public bool IsClsCompliant {
 550                         get {
 551                                 return is_cls_compliant;
 552                         }
 553                 }
 554
 555                 public bool WrapNonExceptionThrows {
 556                         get {
 557                                 return wrap_non_exception_throws;
 558                         }
 559                 }
 560
 561                 public override AttributeTargets AttributeTargets {
 562                         get {
 563                                 return AttributeTargets.Assembly;
 564                         }
 565                 }
 566
 567                 public override bool IsClsComplianceRequired ()
 568                 {
 569                         return is_cls_compliant;
 570                 }
 571
 572                 Report Report {
 573                         get { return Compiler.Report; }
 574                 }
 575
 576                 public void Resolve ()
 577                 {
 578                         if (RootContext.Unsafe) {
 579                                 //
 580                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
 581                                 // when -unsafe option was specified
 582                                 //
 583
 584                                 Location loc = Location.Null;
 585
 586                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
 587                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
 588
 589                                 Arguments pos = new Arguments (1);
 590                                 pos.Add (new Argument (new MemberAccess (new MemberAccess (system_security_permissions, "SecurityAction", loc), "RequestMinimum")));
 591
 592                                 Arguments named = new Arguments (1);
 593                                 named.Add (new NamedArgument ("SkipVerification", loc, new BoolLiteral (true, loc)));
 594
 595                                 GlobalAttribute g = new GlobalAttribute (new NamespaceEntry (null, null, null), "assembly",
 596                                         new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
 597                                         new Arguments[] { pos, named }, loc, false);
 598                                 g.AttachTo (this, this);
 599
 600                                 if (g.Resolve () != null) {
 601                                         declarative_security = new Dictionary<SecurityAction, PermissionSet> ();
 602                                         g.ExtractSecurityPermissionSet (declarative_security);
 603                                 }
 604                         }
 605
 606                         if (OptAttributes == null)
 607                                 return;
 608
 609                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
 610                         if (!OptAttributes.CheckTargets())
 611                                 return;
 612
 613                         ClsCompliantAttribute = ResolveAttribute (PredefinedAttributes.Get.CLSCompliant);
 614
 615                         if (ClsCompliantAttribute != null) {
 616                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
 617                         }
 618
 619                         Attribute a = ResolveAttribute (PredefinedAttributes.Get.RuntimeCompatibility);
 620                         if (a != null) {
 621                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
 622                                 if (val != null)
 623                                         wrap_non_exception_throws = (bool) val;
 624                         }
 625                 }
 626
 627                 // fix bug #56621
 628                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
 629                 {
 630                         try {
 631                                 // check for possible ECMA key
 632                                 if (strongNameBlob.Length == 16) {
 633                                         // will be rejected if not "the" ECMA key
 634                                         an.SetPublicKey (strongNameBlob);
 635                                 }
 636                                 else {
 637                                         // take it, with or without, a private key
 638                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
 639                                         // and make sure we only feed the public part to Sys.Ref
 640                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
 641
 642                                         // AssemblyName.SetPublicKey requires an additional header
 643                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
 644
 645                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
 646                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
 647                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
 648                                         an.SetPublicKey (encodedPublicKey);
 649                                 }
 650                         }
 651                         catch (Exception) {
 652                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
 653                                 Environment.Exit (1);
 654                         }
 655                 }
 656
 657                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
 658                 public AssemblyName GetAssemblyName (string name, string output)
 659                 {
 660                         if (OptAttributes != null) {
 661                                 foreach (Attribute a in OptAttributes.Attrs) {
 662                                         // cannot rely on any resolve-based members before you call Resolve
 663                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
 664                                                 continue;
 665
 666                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
 667                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
 668                                         //       are loaded yet.
 669                                         // TODO: Does not handle quoted attributes properly
 670                                         switch (a.Name) {
 671                                         case "AssemblyKeyFile":
 672                                         case "AssemblyKeyFileAttribute":
 673                                         case "System.Reflection.AssemblyKeyFileAttribute":
 674                                                 if (RootContext.StrongNameKeyFile != null) {
 675                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 676                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 677                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
 678                                                 } else {
 679                                                         string value = a.GetString ();
 680                                                         if (value != null && value.Length != 0)
 681                                                                 RootContext.StrongNameKeyFile = value;
 682                                                 }
 683                                                 break;
 684                                         case "AssemblyKeyName":
 685                                         case "AssemblyKeyNameAttribute":
 686                                         case "System.Reflection.AssemblyKeyNameAttribute":
 687                                                 if (RootContext.StrongNameKeyContainer != null) {
 688                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 689                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 690                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
 691                                                 } else {
 692                                                         string value = a.GetString ();
 693                                                         if (value != null && value.Length != 0)
 694                                                                 RootContext.StrongNameKeyContainer = value;
 695                                                 }
 696                                                 break;
 697                                         case "AssemblyDelaySign":
 698                                         case "AssemblyDelaySignAttribute":
 699                                         case "System.Reflection.AssemblyDelaySignAttribute":
 700                                                 RootContext.StrongNameDelaySign = a.GetBoolean ();
 701                                                 break;
 702                                         }
 703                                 }
 704                         }
 705
 706                         AssemblyName an = new AssemblyName ();
 707                         an.Name = Path.GetFileNameWithoutExtension (name);
 708
 709                         // note: delay doesn't apply when using a key container
 710                         if (RootContext.StrongNameKeyContainer != null) {
 711                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
 712                                 return an;
 713                         }
 714
 715                         // strongname is optional
 716                         if (RootContext.StrongNameKeyFile == null)
 717                                 return an;
 718
 719                         string AssemblyDir = Path.GetDirectoryName (output);
 720
 721                         // the StrongName key file may be relative to (a) the compiled
 722                         // file or (b) to the output assembly. See bugzilla #55320
 723                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
 724
 725                         // (a) relative to the compiled file
 726                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
 727                         bool exist = File.Exists (filename);
 728                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
 729                                 // (b) relative to the outputed assembly
 730                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
 731                                 exist = File.Exists (filename);
 732                         }
 733
 734                         if (exist) {
 735                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
 736                                         byte[] snkeypair = new byte [fs.Length];
 737                                         fs.Read (snkeypair, 0, snkeypair.Length);
 738
 739                                         if (RootContext.StrongNameDelaySign) {
 740                                                 // delayed signing - DO NOT include private key
 741                                                 SetPublicKey (an, snkeypair);
 742                                         }
 743                                         else {
 744                                                 // no delay so we make sure we have the private key
 745                                                 try {
 746                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
 747                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
 748                                                 }
 749                                                 catch (CryptographicException) {
 750                                                         if (snkeypair.Length == 16) {
 751                                                                 // error # is different for ECMA key
 752                                                                 Report.Error (1606, "Could not sign the assembly. " +
 753                                                                         "ECMA key can only be used to delay-sign assemblies");
 754                                                         }
 755                                                         else {
 756                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
 757                                                         }
 758                                                         return null;
 759                                                 }
 760                                         }
 761                                 }
 762                         }
 763                         else {
 764                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
 765                                 return null;
 766                         }
 767                         return an;
 768                 }
 769
 770                 void Error_AssemblySigning (string text)
 771                 {
 772                         Report.Error (1548, "Error during assembly signing. " + text);
 773                 }
 774
 775                 bool CheckInternalsVisibleAttribute (Attribute a)
 776                 {
 777                         string assembly_name = a.GetString ();
 778                         if (assembly_name.Length == 0)
 779                                 return false;
 780
 781                         AssemblyName aname = null;
 782                         try {
 783                                 aname = new AssemblyName (assembly_name);
 784                         } catch (FileLoadException) {
 785                         } catch (ArgumentException) {
 786                         }
 787
 788                         // Bad assembly name format
 789                         if (aname == null)
 790                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
 791                         // Report error if we have defined Version or Culture
 792                         else if (aname.Version != null || aname.CultureInfo != null)
 793                                 throw new Exception ("Friend assembly `" + a.GetString () +
 794                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
 795                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null && Name.GetPublicKey ().Length != 0) {
 796                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
 797                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
 798                                 return false;
 799                         }
 800
 801                         return true;
 802                 }
 803
 804                 static bool IsValidAssemblyVersion (string version)
 805                 {
 806                         Version v;
 807                         try {
 808                                 v = new Version (version);
 809                         } catch {
 810                                 try {
 811                                         int major = int.Parse (version, CultureInfo.InvariantCulture);
 812                                         v = new Version (major, 0);
 813                                 } catch {
 814                                         return false;
 815                                 }
 816                         }
 817
 818                         foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
 819                                 if (candidate > ushort.MaxValue)
 820                                         return false;
 821                         }
 822
 823                         return true;
 824                 }
 825
 826                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
 827                 {
 828                         if (a.IsValidSecurityAttribute ()) {
 829                                 if (declarative_security == null)
 830                                         declarative_security = new Dictionary<SecurityAction, PermissionSet> ();
 831
 832                                 a.ExtractSecurityPermissionSet (declarative_security);
 833                                 return;
 834                         }
 835
 836                         if (a.Type == pa.AssemblyCulture) {
 837                                 string value = a.GetString ();
 838                                 if (value == null || value.Length == 0)
 839                                         return;
 840
 841                                 if (RootContext.Target == Target.Exe) {
 842                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
 843                                         return;
 844                                 }
 845                         }
 846
 847                         if (a.Type == pa.AssemblyVersion) {
 848                                 string value = a.GetString ();
 849                                 if (value == null || value.Length == 0)
 850                                         return;
 851
 852                                 value = value.Replace ('*', '0');
 853
 854                                 if (!IsValidAssemblyVersion (value)) {
 855                                         a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
 856                                         return;
 857                                 }
 858                         }
 859
 860                         if (a.Type == pa.InternalsVisibleTo && !CheckInternalsVisibleAttribute (a))
 861                                 return;
 862
 863                         if (a.Type == pa.TypeForwarder) {
 864                                 Type t = a.GetArgumentType ();
 865                                 if (t == null || TypeManager.HasElementType (t)) {
 866                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
 867                                         return;
 868                                 }
 869
 870                                 t = TypeManager.DropGenericTypeArguments (t);
 871                                 if (emitted_forwarders == null) {
 872                                         emitted_forwarders = new Dictionary<Type, Attribute>  ();
 873                                 } else if (emitted_forwarders.ContainsKey (t)) {
 874                                         Report.SymbolRelatedToPreviousError(emitted_forwarders[t].Location, null);
 875                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
 876                                                 TypeManager.CSharpName(t));
 877                                         return;
 878                                 }
 879
 880                                 emitted_forwarders.Add(t, a);
 881
 882                                 if (TypeManager.LookupDeclSpace (t) != null) {
 883                                         Report.SymbolRelatedToPreviousError (t);
 884                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
 885                                                 TypeManager.CSharpName (t));
 886                                         return;
 887                                 }
 888
 889                                 if (t.DeclaringType != null) {
 890                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
 891                                                 TypeManager.CSharpName (t));
 892                                         return;
 893                                 }
 894
 895                                 if (add_type_forwarder == null) {
 896                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
 897                                                 BindingFlags.NonPublic | BindingFlags.Instance);
 898
 899                                         if (add_type_forwarder == null) {
 900                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
 901                                                 return;
 902                                         }
 903                                 }
 904
 905                                 add_type_forwarder.Invoke (Builder, new object[] { t });
 906                                 return;
 907                         }
 908
 909                         if (a.Type == pa.Extension) {
 910                                 a.Error_MisusedExtensionAttribute ();
 911                                 return;
 912                         }
 913
 914                         Builder.SetCustomAttribute (cb);
 915                 }
 916
 917                 public override void Emit (TypeContainer tc)
 918                 {
 919                         base.Emit (tc);
 920
 921                         if (has_extension_method)
 922                                 PredefinedAttributes.Get.Extension.EmitAttribute (Builder);
 923
 924                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
 925                         PredefinedAttribute pa = PredefinedAttributes.Get.RuntimeCompatibility;
 926                         if (pa.IsDefined && (OptAttributes == null || !OptAttributes.Contains (pa))) {
 927                                 ConstructorInfo ci = TypeManager.GetPredefinedConstructor (
 928                                         pa.Type, Location.Null, Type.EmptyTypes);
 929                                 PropertyInfo [] pis = new PropertyInfo [1];
 930                                 pis [0] = TypeManager.GetPredefinedProperty (pa.Type,
 931                                         "WrapNonExceptionThrows", Location.Null, TypeManager.bool_type).MetaInfo;
 932                                 object [] pargs = new object [1];
 933                                 pargs [0] = true;
 934                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
 935                         }
 936
 937                         if (declarative_security != null) {
 938
 939                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
 940                                 object builder_instance = Builder;
 941
 942                                 try {
 943                                         // Microsoft runtime hacking
 944                                         if (add_permission == null) {
 945                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
 946                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
 947
 948                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
 949                                                 builder_instance = fi.GetValue (Builder);
 950                                         }
 951
 952                                         var args = new PermissionSet [3];
 953                                         declarative_security.TryGetValue (SecurityAction.RequestMinimum, out args [0]);
 954                                         declarative_security.TryGetValue (SecurityAction.RequestOptional, out args [1]);
 955                                         declarative_security.TryGetValue (SecurityAction.RequestRefuse, out args [2]);
 956                                         add_permission.Invoke (builder_instance, args);
 957                                 }
 958                                 catch {
 959                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
 960                                 }
 961                         }
 962                 }
 963
 964                 public override string[] ValidAttributeTargets {
 965                         get {
 966                                 return attribute_targets;
 967                         }
 968                 }
 969
 970                 // Wrapper for AssemblyBuilder.AddModule
 971                 static MethodInfo adder_method;
 972                 static public MethodInfo AddModule_Method {
 973                         get {
 974                                 if (adder_method == null)
 975                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
 976                                 return adder_method;
 977                         }
 978                 }
 979                 public Module AddModule (string module)
 980                 {
 981                         MethodInfo m = AddModule_Method;
 982                         if (m == null) {
 983                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
 984                                 Environment.Exit (1);
 985                         }
 986
 987                         try {
 988                                 return (Module) m.Invoke (Builder, new object [] { module });
 989                         } catch (TargetInvocationException ex) {
 990                                 throw ex.InnerException;
 991                         }
 992                 }
 993         }
 994 }