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;
  23 using System.Collections.Specialized;
  24 using System.Globalization;
  25 using System.Reflection;
  26 using System.Reflection.Emit;
  27 using System.Runtime.InteropServices;
  28 using System.Security;
  29 using System.Security.Cryptography;
  30 using System.Security.Permissions;
  31
  32 using Mono.Security.Cryptography;
  33
  34 namespace Mono.CSharp {
  35
  36         /// <summary>
  37         ///    Code generator class.
  38         /// </summary>
  39         public class CodeGen {
  40                 static AppDomain current_domain;
  41
  42                 public static AssemblyClass Assembly;
  43
  44                 static CodeGen ()
  45                 {
  46                         Reset ();
  47                 }
  48
  49                 public static void Reset ()
  50                 {
  51                         Assembly = new AssemblyClass ();
  52                 }
  53
  54                 public static string Basename (string name)
  55                 {
  56                         int pos = name.LastIndexOf ('/');
  57
  58                         if (pos != -1)
  59                                 return name.Substring (pos + 1);
  60
  61                         pos = name.LastIndexOf ('\\');
  62                         if (pos != -1)
  63                                 return name.Substring (pos + 1);
  64
  65                         return name;
  66                 }
  67
  68                 public static string Dirname (string name)
  69                 {
  70                         int pos = name.LastIndexOf ('/');
  71
  72                         if (pos != -1)
  73                                 return name.Substring (0, pos);
  74
  75                         pos = name.LastIndexOf ('\\');
  76                         if (pos != -1)
  77                                 return name.Substring (0, pos);
  78
  79                         return ".";
  80                 }
  81
  82                 static public string FileName;
  83
  84 #if MS_COMPATIBLE
  85                 const AssemblyBuilderAccess COMPILER_ACCESS = 0;
  86 #else
  87                 /* Keep this in sync with System.Reflection.Emit.AssemblyBuilder */
  88                 const AssemblyBuilderAccess COMPILER_ACCESS = (AssemblyBuilderAccess) 0x800;
  89 #endif
  90
  91                 //
  92                 // Initializes the code generator variables for interactive use (repl)
  93                 //
  94                 static public void InitDynamic (string name)
  95                 {
  96                         current_domain = AppDomain.CurrentDomain;
  97                         AssemblyName an = Assembly.GetAssemblyName (name, name);
  98
  99                         Assembly.Builder = current_domain.DefineDynamicAssembly (an, AssemblyBuilderAccess.Run | COMPILER_ACCESS);
 100                         RootContext.ToplevelTypes = new ModuleContainer (true);
 101                         RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (Basename (name), false);
 102                         Assembly.Name = Assembly.Builder.GetName ();
 103                 }
 104
 105                 //
 106                 // Initializes the code generator variables
 107                 //
 108                 static public bool Init (string name, string output, bool want_debugging_support)
 109                 {
 110                         FileName = output;
 111                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 112                         if (an == null)
 113                                 return false;
 114
 115                         if (an.KeyPair != null) {
 116                                 // If we are going to strong name our assembly make
 117                                 // sure all its refs are strong named
 118                                 foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
 119                                         AssemblyName ref_name = a.GetName ();
 120                                         byte [] b = ref_name.GetPublicKeyToken ();
 121                                         if (b == null || b.Length == 0) {
 122                                                 Report.Error (1577, "Assembly generation failed " +
 123                                                                 "-- Referenced assembly '" +
 124                                                                 ref_name.Name +
 125                                                                 "' does not have a strong name.");
 126                                                 //Environment.Exit (1);
 127                                         }
 128                                 }
 129                         }
 130
 131                         current_domain = AppDomain.CurrentDomain;
 132
 133                         try {
 134                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 135                                         AssemblyBuilderAccess.RunAndSave | COMPILER_ACCESS, Dirname (name));
 136                         }
 137                         catch (ArgumentException) {
 138                                 // specified key may not be exportable outside it's container
 139                                 if (RootContext.StrongNameKeyContainer != null) {
 140                                         Report.Error (1548, "Could not access the key inside the container `" +
 141                                                 RootContext.StrongNameKeyContainer + "'.");
 142                                         Environment.Exit (1);
 143                                 }
 144                                 throw;
 145                         }
 146                         catch (CryptographicException) {
 147                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 148                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 149                                         Environment.Exit (1);
 150                                 }
 151                                 return false;
 152                         }
 153
 154                         // Get the complete AssemblyName from the builder
 155                         // (We need to get the public key and token)
 156                         Assembly.Name = Assembly.Builder.GetName ();
 157
 158                         //
 159                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 160                         // this copes with output in different directories then.
 161                         // FIXME: figure out how this copes with --output /tmp/blah
 162                         //
 163                         // If the third argument is true, the ModuleBuilder will dynamically
 164                         // load the default symbol writer.
 165                         //
 166                         try {
 167                                 RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (
 168                                         Basename (name), Basename (output), want_debugging_support);
 169
 170 #if !MS_COMPATIBLE
 171                                 // TODO: We should use SymbolWriter from DefineDynamicModule
 172                                 if (want_debugging_support && !SymbolWriter.Initialize (RootContext.ToplevelTypes.Builder, output)) {
 173                                         Report.Error (40, "Unexpected debug information initialization error `{0}'",
 174                                                 "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll)");
 175                                         return false;
 176                                 }
 177 #endif
 178                         } catch (ExecutionEngineException e) {
 179                                 Report.Error (40, "Unexpected debug information initialization error `{0}'",
 180                                         e.Message);
 181                                 return false;
 182                         }
 183
 184                         return true;
 185                 }
 186
 187                 static public void Save (string name, bool saveDebugInfo)
 188                 {
 189 #if GMCS_SOURCE
 190                         PortableExecutableKinds pekind;
 191                         ImageFileMachine machine;
 192
 193                         switch (RootContext.Platform) {
 194                         case Platform.X86:
 195                                 pekind = PortableExecutableKinds.Required32Bit;
 196                                 machine = ImageFileMachine.I386;
 197                                 break;
 198                         case Platform.X64:
 199                                 pekind = PortableExecutableKinds.PE32Plus;
 200                                 machine = ImageFileMachine.AMD64;
 201                                 break;
 202                         case Platform.IA64:
 203                                 pekind = PortableExecutableKinds.PE32Plus;
 204                                 machine = ImageFileMachine.IA64;
 205                                 break;
 206                         case Platform.AnyCPU:
 207                         default:
 208                                 pekind = PortableExecutableKinds.ILOnly;
 209                                 machine = ImageFileMachine.I386;
 210                                 break;
 211                         }
 212 #endif
 213                         try {
 214 #if GMCS_SOURCE
 215                                 Assembly.Builder.Save (Basename (name), pekind, machine);
 216 #else
 217                                 Assembly.Builder.Save (Basename (name));
 218 #endif
 219                         }
 220                         catch (COMException) {
 221                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 222                                         throw;
 223
 224                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 225                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 226                                         RootContext.StrongNameKeyFile +
 227                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 228                         }
 229                         catch (System.IO.IOException io) {
 230                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 231                                 return;
 232                         }
 233                         catch (System.UnauthorizedAccessException ua) {
 234                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 235                                 return;
 236                         }
 237                         catch (System.NotImplementedException nie) {
 238                                 Report.RuntimeMissingSupport (Location.Null, nie.Message);
 239                                 return;
 240                         }
 241
 242                         //
 243                         // Write debuger symbol file
 244                         //
 245                         if (saveDebugInfo)
 246                                 SymbolWriter.WriteSymbolFile ();
 247                         }
 248         }
 249
 250
 251         /// <summary>
 252         ///   An Emit Context is created for each body of code (from methods,
 253         ///   properties bodies, indexer bodies or constructor bodies)
 254         /// </summary>
 255         public class EmitContext {
 256
 257                 [Flags]
 258                 public enum Options
 259                 {
 260                         /// <summary>
 261                         ///   This flag tracks the `checked' state of the compilation,
 262                         ///   it controls whether we should generate code that does overflow
 263                         ///   checking, or if we generate code that ignores overflows.
 264                         ///
 265                         ///   The default setting comes from the command line option to generate
 266                         ///   checked or unchecked code plus any source code changes using the
 267                         ///   checked/unchecked statements or expressions.   Contrast this with
 268                         ///   the ConstantCheckState flag.
 269                         /// </summary>
 270                         CheckedScope = 1 << 0,
 271
 272                         /// <summary>
 273                         ///   The constant check state is always set to `true' and cant be changed
 274                         ///   from the command line.  The source code can change this setting with
 275                         ///   the `checked' and `unchecked' statements and expressions.
 276                         /// </summary>
 277                         ConstantCheckState = 1 << 1,
 278
 279                         AllCheckStateFlags = CheckedScope | ConstantCheckState,
 280
 281                         OmitDebugInfo = 1 << 2,
 282
 283                         ConstructorScope = 1 << 3
 284                 }
 285
 286                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 287                 // it's public so that we can use a struct at the callsite
 288                 public struct FlagsHandle : IDisposable
 289                 {
 290                         EmitContext ec;
 291                         readonly Options invmask, oldval;
 292
 293                         public FlagsHandle (EmitContext ec, Options flagsToSet)
 294                                 : this (ec, flagsToSet, flagsToSet)
 295                         {
 296                         }
 297
 298                         internal FlagsHandle (EmitContext ec, Options mask, Options val)
 299                         {
 300                                 this.ec = ec;
 301                                 invmask = ~mask;
 302                                 oldval = ec.flags & mask;
 303                                 ec.flags = (ec.flags & invmask) | (val & mask);
 304                         }
 305
 306                         public void Dispose ()
 307                         {
 308                                 ec.flags = (ec.flags & invmask) | oldval;
 309                         }
 310                 }
 311
 312                 Options flags;
 313
 314                 public ILGenerator ig;
 315
 316                 /// <summary>
 317                 ///   The value that is allowed to be returned or NULL if there is no
 318                 ///   return type.
 319                 /// </summary>
 320                 protected Type return_type;
 321
 322                 /// <summary>
 323                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 324                 ///   to store structures (used to compute the address of the structure
 325                 ///   value on structure method invocations)
 326                 /// </summary>
 327                 public Hashtable temporary_storage;
 328
 329                 /// <summary>
 330                 ///   The location where we store the return value.
 331                 /// </summary>
 332                 public LocalBuilder return_value;
 333
 334                 /// <summary>
 335                 ///   The location where return has to jump to return the
 336                 ///   value
 337                 /// </summary>
 338                 public Label ReturnLabel;
 339
 340                 /// <summary>
 341                 ///   If we already defined the ReturnLabel
 342                 /// </summary>
 343                 public bool HasReturnLabel;
 344
 345                 /// <summary>
 346                 ///  Whether we are inside an anonymous method.
 347                 /// </summary>
 348                 public AnonymousExpression CurrentAnonymousMethod;
 349
 350                 public readonly IMemberContext MemberContext;
 351
 352                 public EmitContext (IMemberContext rc, ILGenerator ig, Type return_type)
 353                 {
 354                         this.MemberContext = rc;
 355                         this.ig = ig;
 356
 357                         this.return_type = return_type;
 358                 }
 359
 360                 public Type CurrentType {
 361                         get { return MemberContext.CurrentType; }
 362                 }
 363
 364                 public TypeParameter[] CurrentTypeParameters {
 365                         get { return MemberContext.CurrentTypeParameters; }
 366                 }
 367
 368                 public TypeContainer CurrentTypeDefinition {
 369                         get { return MemberContext.CurrentTypeDefinition; }
 370                 }
 371
 372                 public bool HasSet (Options options)
 373                 {
 374                         return (this.flags & options) == options;
 375                 }
 376
 377                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 378                 public FlagsHandle With (Options options, bool enable)
 379                 {
 380                         return new FlagsHandle (this, options, enable ? options : 0);
 381                 }
 382
 383                 public bool IsStatic {
 384                         get { return MemberContext.IsStatic; }
 385                 }
 386
 387                 public Type ReturnType {
 388                         get {
 389                                 return return_type;
 390                         }
 391                 }
 392
 393                 /// <summary>
 394                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 395                 ///   writer to which source line this opcode belongs.
 396                 /// </summary>
 397                 public void Mark (Location loc)
 398                 {
 399                         if (!SymbolWriter.HasSymbolWriter || HasSet (Options.OmitDebugInfo) || loc.IsNull)
 400                                 return;
 401
 402                         SymbolWriter.MarkSequencePoint (ig, loc);
 403                 }
 404
 405                 public void DefineLocalVariable (string name, LocalBuilder builder)
 406                 {
 407                         SymbolWriter.DefineLocalVariable (name, builder);
 408                 }
 409
 410                 public void BeginScope ()
 411                 {
 412                         ig.BeginScope();
 413                         SymbolWriter.OpenScope(ig);
 414                 }
 415
 416                 public void EndScope ()
 417                 {
 418                         ig.EndScope();
 419                         SymbolWriter.CloseScope(ig);
 420                 }
 421
 422                 /// <summary>
 423                 ///   Returns a temporary storage for a variable of type t as
 424                 ///   a local variable in the current body.
 425                 /// </summary>
 426                 public LocalBuilder GetTemporaryLocal (Type t)
 427                 {
 428                         if (temporary_storage != null) {
 429                                 object o = temporary_storage [t];
 430                                 if (o != null) {
 431                                         if (o is Stack) {
 432                                                 Stack s = (Stack) o;
 433                                                 o = s.Count == 0 ? null : s.Pop ();
 434                                         } else {
 435                                                 temporary_storage.Remove (t);
 436                                         }
 437                                 }
 438                                 if (o != null)
 439                                         return (LocalBuilder) o;
 440                         }
 441                         return ig.DeclareLocal (t);
 442                 }
 443
 444                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 445                 {
 446                         if (temporary_storage == null) {
 447                                 temporary_storage = new Hashtable ();
 448                                 temporary_storage [t] = b;
 449                                 return;
 450                         }
 451                         object o = temporary_storage [t];
 452                         if (o == null) {
 453                                 temporary_storage [t] = b;
 454                                 return;
 455                         }
 456                         Stack s = o as Stack;
 457                         if (s == null) {
 458                                 s = new Stack ();
 459                                 s.Push (o);
 460                                 temporary_storage [t] = s;
 461                         }
 462                         s.Push (b);
 463                 }
 464
 465                 /// <summary>
 466                 ///   Current loop begin and end labels.
 467                 /// </summary>
 468                 public Label LoopBegin, LoopEnd;
 469
 470                 /// <summary>
 471                 ///   Default target in a switch statement.   Only valid if
 472                 ///   InSwitch is true
 473                 /// </summary>
 474                 public Label DefaultTarget;
 475
 476                 /// <summary>
 477                 ///   If this is non-null, points to the current switch statement
 478                 /// </summary>
 479                 public Switch Switch;
 480
 481                 /// <summary>
 482                 ///   ReturnValue creates on demand the LocalBuilder for the
 483                 ///   return value from the function.  By default this is not
 484                 ///   used.  This is only required when returns are found inside
 485                 ///   Try or Catch statements.
 486                 ///
 487                 ///   This method is typically invoked from the Emit phase, so
 488                 ///   we allow the creation of a return label if it was not
 489                 ///   requested during the resolution phase.   Could be cleaned
 490                 ///   up, but it would replicate a lot of logic in the Emit phase
 491                 ///   of the code that uses it.
 492                 /// </summary>
 493                 public LocalBuilder TemporaryReturn ()
 494                 {
 495                         if (return_value == null){
 496                                 return_value = ig.DeclareLocal (return_type);
 497                                 if (!HasReturnLabel){
 498                                         ReturnLabel = ig.DefineLabel ();
 499                                         HasReturnLabel = true;
 500                                 }
 501                         }
 502
 503                         return return_value;
 504                 }
 505         }
 506
 507         public abstract class CommonAssemblyModulClass : Attributable, IMemberContext
 508         {
 509                 public void AddAttributes (ArrayList attrs, IMemberContext context)
 510                 {
 511                         foreach (Attribute a in attrs)
 512                                 a.AttachTo (this, context);
 513
 514                         if (attributes == null) {
 515                                 attributes = new Attributes (attrs);
 516                                 return;
 517                         }
 518                         attributes.AddAttributes (attrs);
 519                 }
 520
 521                 public virtual void Emit (TypeContainer tc)
 522                 {
 523                         if (OptAttributes == null)
 524                                 return;
 525
 526                         OptAttributes.Emit ();
 527                 }
 528
 529                 protected Attribute ResolveAttribute (PredefinedAttribute a_type)
 530                 {
 531                         Attribute a = OptAttributes.Search (a_type);
 532                         if (a != null) {
 533                                 a.Resolve ();
 534                         }
 535                         return a;
 536                 }
 537
 538                 #region IMemberContext Members
 539
 540                 public Type CurrentType {
 541                         get { return null; }
 542                 }
 543
 544                 public TypeParameter[] CurrentTypeParameters {
 545                         get { return null; }
 546                 }
 547
 548                 public TypeContainer CurrentTypeDefinition {
 549                         get { return RootContext.ToplevelTypes; }
 550                 }
 551
 552                 public string GetSignatureForError ()
 553                 {
 554                         return "<module>";
 555                 }
 556
 557                 public bool IsObsolete {
 558                         get { return false; }
 559                 }
 560
 561                 public bool IsUnsafe {
 562                         get { return false; }
 563                 }
 564
 565                 public bool IsStatic {
 566                         get { return false; }
 567                 }
 568
 569                 public ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
 570                 {
 571                         throw new NotImplementedException ();
 572                 }
 573
 574                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
 575                 {
 576                         return RootContext.ToplevelTypes.LookupNamespaceOrType (name, loc, ignore_cs0104);
 577                 }
 578
 579                 public FullNamedExpression LookupNamespaceAlias (string name)
 580                 {
 581                         return null;
 582                 }
 583
 584                 #endregion
 585         }
 586
 587         public class AssemblyClass : CommonAssemblyModulClass {
 588                 // TODO: make it private and move all builder based methods here
 589                 public AssemblyBuilder Builder;
 590                 bool is_cls_compliant;
 591                 bool wrap_non_exception_throws;
 592
 593                 public Attribute ClsCompliantAttribute;
 594
 595                 ListDictionary declarative_security;
 596                 bool has_extension_method;
 597                 public AssemblyName Name;
 598                 MethodInfo add_type_forwarder;
 599                 ListDictionary emitted_forwarders;
 600
 601                 // Module is here just because of error messages
 602                 static string[] attribute_targets = new string [] { "assembly", "module" };
 603
 604                 public AssemblyClass (): base ()
 605                 {
 606                         wrap_non_exception_throws = true;
 607                 }
 608
 609                 public bool HasExtensionMethods {
 610                         set {
 611                                 has_extension_method = value;
 612                         }
 613                 }
 614
 615                 public bool IsClsCompliant {
 616                         get {
 617                                 return is_cls_compliant;
 618                         }
 619                 }
 620
 621                 public bool WrapNonExceptionThrows {
 622                         get {
 623                                 return wrap_non_exception_throws;
 624                         }
 625                 }
 626
 627                 public override AttributeTargets AttributeTargets {
 628                         get {
 629                                 return AttributeTargets.Assembly;
 630                         }
 631                 }
 632
 633                 public override bool IsClsComplianceRequired ()
 634                 {
 635                         return is_cls_compliant;
 636                 }
 637
 638                 public void Resolve ()
 639                 {
 640                         if (RootContext.Unsafe) {
 641                                 //
 642                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
 643                                 // when -unsafe option was specified
 644                                 //
 645
 646                                 Location loc = Location.Null;
 647
 648                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
 649                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
 650
 651                                 Arguments pos = new Arguments (1);
 652                                 pos.Add (new Argument (new MemberAccess (new MemberAccess (system_security_permissions, "SecurityAction", loc), "RequestMinimum")));
 653
 654                                 Arguments named = new Arguments (1);
 655                                 named.Add (new NamedArgument (new LocatedToken (loc, "SkipVerification"), (new BoolLiteral (true, loc))));
 656
 657                                 GlobalAttribute g = new GlobalAttribute (new NamespaceEntry (null, null, null), "assembly",
 658                                         new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
 659                                         new Arguments[] { pos, named }, loc, false);
 660                                 g.AttachTo (this, this);
 661
 662                                 if (g.Resolve () != null) {
 663                                         declarative_security = new ListDictionary ();
 664                                         g.ExtractSecurityPermissionSet (declarative_security);
 665                                 }
 666                         }
 667
 668                         if (OptAttributes == null)
 669                                 return;
 670
 671                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
 672                         if (!OptAttributes.CheckTargets())
 673                                 return;
 674
 675                         ClsCompliantAttribute = ResolveAttribute (PredefinedAttributes.Get.CLSCompliant);
 676
 677                         if (ClsCompliantAttribute != null) {
 678                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
 679                         }
 680
 681                         Attribute a = ResolveAttribute (PredefinedAttributes.Get.RuntimeCompatibility);
 682                         if (a != null) {
 683                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
 684                                 if (val != null)
 685                                         wrap_non_exception_throws = (bool) val;
 686                         }
 687                 }
 688
 689                 // fix bug #56621
 690                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
 691                 {
 692                         try {
 693                                 // check for possible ECMA key
 694                                 if (strongNameBlob.Length == 16) {
 695                                         // will be rejected if not "the" ECMA key
 696                                         an.SetPublicKey (strongNameBlob);
 697                                 }
 698                                 else {
 699                                         // take it, with or without, a private key
 700                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
 701                                         // and make sure we only feed the public part to Sys.Ref
 702                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
 703
 704                                         // AssemblyName.SetPublicKey requires an additional header
 705                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
 706
 707                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
 708                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
 709                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
 710                                         an.SetPublicKey (encodedPublicKey);
 711                                 }
 712                         }
 713                         catch (Exception) {
 714                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
 715                                 Environment.Exit (1);
 716                         }
 717                 }
 718
 719                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
 720                 public AssemblyName GetAssemblyName (string name, string output)
 721                 {
 722                         if (OptAttributes != null) {
 723                                 foreach (Attribute a in OptAttributes.Attrs) {
 724                                         // cannot rely on any resolve-based members before you call Resolve
 725                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
 726                                                 continue;
 727
 728                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
 729                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
 730                                         //       are loaded yet.
 731                                         // TODO: Does not handle quoted attributes properly
 732                                         switch (a.Name) {
 733                                         case "AssemblyKeyFile":
 734                                         case "AssemblyKeyFileAttribute":
 735                                         case "System.Reflection.AssemblyKeyFileAttribute":
 736                                                 if (RootContext.StrongNameKeyFile != null) {
 737                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 738                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 739                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
 740                                                 } else {
 741                                                         string value = a.GetString ();
 742                                                         if (value != null && value.Length != 0)
 743                                                                 RootContext.StrongNameKeyFile = value;
 744                                                 }
 745                                                 break;
 746                                         case "AssemblyKeyName":
 747                                         case "AssemblyKeyNameAttribute":
 748                                         case "System.Reflection.AssemblyKeyNameAttribute":
 749                                                 if (RootContext.StrongNameKeyContainer != null) {
 750                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 751                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 752                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
 753                                                 } else {
 754                                                         string value = a.GetString ();
 755                                                         if (value != null && value.Length != 0)
 756                                                                 RootContext.StrongNameKeyContainer = value;
 757                                                 }
 758                                                 break;
 759                                         case "AssemblyDelaySign":
 760                                         case "AssemblyDelaySignAttribute":
 761                                         case "System.Reflection.AssemblyDelaySignAttribute":
 762                                                 RootContext.StrongNameDelaySign = a.GetBoolean ();
 763                                                 break;
 764                                         }
 765                                 }
 766                         }
 767
 768                         AssemblyName an = new AssemblyName ();
 769                         an.Name = Path.GetFileNameWithoutExtension (name);
 770
 771                         // note: delay doesn't apply when using a key container
 772                         if (RootContext.StrongNameKeyContainer != null) {
 773                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
 774                                 return an;
 775                         }
 776
 777                         // strongname is optional
 778                         if (RootContext.StrongNameKeyFile == null)
 779                                 return an;
 780
 781                         string AssemblyDir = Path.GetDirectoryName (output);
 782
 783                         // the StrongName key file may be relative to (a) the compiled
 784                         // file or (b) to the output assembly. See bugzilla #55320
 785                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
 786
 787                         // (a) relative to the compiled file
 788                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
 789                         bool exist = File.Exists (filename);
 790                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
 791                                 // (b) relative to the outputed assembly
 792                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
 793                                 exist = File.Exists (filename);
 794                         }
 795
 796                         if (exist) {
 797                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
 798                                         byte[] snkeypair = new byte [fs.Length];
 799                                         fs.Read (snkeypair, 0, snkeypair.Length);
 800
 801                                         if (RootContext.StrongNameDelaySign) {
 802                                                 // delayed signing - DO NOT include private key
 803                                                 SetPublicKey (an, snkeypair);
 804                                         }
 805                                         else {
 806                                                 // no delay so we make sure we have the private key
 807                                                 try {
 808                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
 809                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
 810                                                 }
 811                                                 catch (CryptographicException) {
 812                                                         if (snkeypair.Length == 16) {
 813                                                                 // error # is different for ECMA key
 814                                                                 Report.Error (1606, "Could not sign the assembly. " +
 815                                                                         "ECMA key can only be used to delay-sign assemblies");
 816                                                         }
 817                                                         else {
 818                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
 819                                                         }
 820                                                         return null;
 821                                                 }
 822                                         }
 823                                 }
 824                         }
 825                         else {
 826                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
 827                                 return null;
 828                         }
 829                         return an;
 830                 }
 831
 832                 void Error_AssemblySigning (string text)
 833                 {
 834                         Report.Error (1548, "Error during assembly signing. " + text);
 835                 }
 836
 837                 bool CheckInternalsVisibleAttribute (Attribute a)
 838                 {
 839                         string assembly_name = a.GetString ();
 840                         if (assembly_name.Length == 0)
 841                                 return false;
 842
 843                         AssemblyName aname = null;
 844                         try {
 845 #if GMCS_SOURCE
 846                                 aname = new AssemblyName (assembly_name);
 847 #else
 848                                 throw new NotSupportedException ();
 849 #endif
 850                         } catch (FileLoadException) {
 851                         } catch (ArgumentException) {
 852                         }
 853
 854                         // Bad assembly name format
 855                         if (aname == null)
 856                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
 857                         // Report error if we have defined Version or Culture
 858                         else if (aname.Version != null || aname.CultureInfo != null)
 859                                 throw new Exception ("Friend assembly `" + a.GetString () +
 860                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
 861                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null && Name.GetPublicKey ().Length != 0) {
 862                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
 863                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
 864                                 return false;
 865                         }
 866
 867                         return true;
 868                 }
 869
 870                 static bool IsValidAssemblyVersion (string version)
 871                 {
 872                         Version v;
 873                         try {
 874                                 v = new Version (version);
 875                         } catch {
 876                                 try {
 877                                         int major = int.Parse (version, CultureInfo.InvariantCulture);
 878                                         v = new Version (major, 0);
 879                                 } catch {
 880                                         return false;
 881                                 }
 882                         }
 883
 884                         foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
 885                                 if (candidate > ushort.MaxValue)
 886                                         return false;
 887                         }
 888
 889                         return true;
 890                 }
 891
 892                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
 893                 {
 894                         if (a.IsValidSecurityAttribute ()) {
 895                                 if (declarative_security == null)
 896                                         declarative_security = new ListDictionary ();
 897
 898                                 a.ExtractSecurityPermissionSet (declarative_security);
 899                                 return;
 900                         }
 901
 902                         if (a.Type == pa.AssemblyCulture) {
 903                                 string value = a.GetString ();
 904                                 if (value == null || value.Length == 0)
 905                                         return;
 906
 907                                 if (RootContext.Target == Target.Exe) {
 908                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
 909                                         return;
 910                                 }
 911                         }
 912
 913                         if (a.Type == pa.AssemblyVersion) {
 914                                 string value = a.GetString ();
 915                                 if (value == null || value.Length == 0)
 916                                         return;
 917
 918                                 value = value.Replace ('*', '0');
 919
 920                                 if (!IsValidAssemblyVersion (value)) {
 921                                         a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
 922                                         return;
 923                                 }
 924                         }
 925
 926                         if (a.Type == pa.InternalsVisibleTo && !CheckInternalsVisibleAttribute (a))
 927                                 return;
 928
 929                         if (a.Type == pa.TypeForwarder) {
 930                                 Type t = a.GetArgumentType ();
 931                                 if (t == null || TypeManager.HasElementType (t)) {
 932                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
 933                                         return;
 934                                 }
 935
 936                                 t = TypeManager.DropGenericTypeArguments (t);
 937                                 if (emitted_forwarders == null) {
 938                                         emitted_forwarders = new ListDictionary();
 939                                 } else if (emitted_forwarders.Contains(t)) {
 940                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
 941                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
 942                                                 TypeManager.CSharpName(t));
 943                                         return;
 944                                 }
 945
 946                                 emitted_forwarders.Add(t, a);
 947
 948                                 if (TypeManager.LookupDeclSpace (t) != null) {
 949                                         Report.SymbolRelatedToPreviousError (t);
 950                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
 951                                                 TypeManager.CSharpName (t));
 952                                         return;
 953                                 }
 954
 955                                 if (t.DeclaringType != null) {
 956                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
 957                                                 TypeManager.CSharpName (t));
 958                                         return;
 959                                 }
 960
 961                                 if (add_type_forwarder == null) {
 962                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
 963                                                 BindingFlags.NonPublic | BindingFlags.Instance);
 964
 965                                         if (add_type_forwarder == null) {
 966                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
 967                                                 return;
 968                                         }
 969                                 }
 970
 971                                 add_type_forwarder.Invoke (Builder, new object[] { t });
 972                                 return;
 973                         }
 974
 975                         if (a.Type == pa.Extension) {
 976                                 a.Error_MisusedExtensionAttribute ();
 977                                 return;
 978                         }
 979
 980                         Builder.SetCustomAttribute (cb);
 981                 }
 982
 983                 public override void Emit (TypeContainer tc)
 984                 {
 985                         base.Emit (tc);
 986
 987                         if (has_extension_method)
 988                                 PredefinedAttributes.Get.Extension.EmitAttribute (Builder);
 989
 990                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
 991                         PredefinedAttribute pa = PredefinedAttributes.Get.RuntimeCompatibility;
 992                         if (pa.IsDefined && (OptAttributes == null || !OptAttributes.Contains (pa))) {
 993                                 ConstructorInfo ci = TypeManager.GetPredefinedConstructor (
 994                                         pa.Type, Location.Null, Type.EmptyTypes);
 995                                 PropertyInfo [] pis = new PropertyInfo [1];
 996                                 pis [0] = TypeManager.GetPredefinedProperty (pa.Type,
 997                                         "WrapNonExceptionThrows", Location.Null, TypeManager.bool_type);
 998                                 object [] pargs = new object [1];
 999                                 pargs [0] = true;
1000                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1001                         }
1002
1003                         if (declarative_security != null) {
1004
1005                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1006                                 object builder_instance = Builder;
1007
1008                                 try {
1009                                         // Microsoft runtime hacking
1010                                         if (add_permission == null) {
1011                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1012                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1013
1014                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1015                                                 builder_instance = fi.GetValue (Builder);
1016                                         }
1017
1018                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1019                                                                                                   declarative_security [SecurityAction.RequestOptional],
1020                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1021                                         add_permission.Invoke (builder_instance, args);
1022                                 }
1023                                 catch {
1024                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1025                                 }
1026                         }
1027                 }
1028
1029                 public override string[] ValidAttributeTargets {
1030                         get {
1031                                 return attribute_targets;
1032                         }
1033                 }
1034
1035                 // Wrapper for AssemblyBuilder.AddModule
1036                 static MethodInfo adder_method;
1037                 static public MethodInfo AddModule_Method {
1038                         get {
1039                                 if (adder_method == null)
1040                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
1041                                 return adder_method;
1042                         }
1043                 }
1044                 public Module AddModule (string module)
1045                 {
1046                         MethodInfo m = AddModule_Method;
1047                         if (m == null) {
1048                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
1049                                 Environment.Exit (1);
1050                         }
1051
1052                         try {
1053                                 return (Module) m.Invoke (Builder, new object [] { module });
1054                         } catch (TargetInvocationException ex) {
1055                                 throw ex.InnerException;
1056                         }
1057                 }
1058         }
1059 }