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 (CompilerContext ctx, 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 (ctx, 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, CompilerContext ctx)
 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                                                 ctx.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                                         ctx.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                                         ctx.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                                         ctx.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                                 ctx.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, Report Report)
 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         /// <summary>
 251         ///   An Emit Context is created for each body of code (from methods,
 252         ///   properties bodies, indexer bodies or constructor bodies)
 253         /// </summary>
 254         public class EmitContext : BuilderContext
 255         {
 256                 public ILGenerator ig;
 257
 258                 /// <summary>
 259                 ///   The value that is allowed to be returned or NULL if there is no
 260                 ///   return type.
 261                 /// </summary>
 262                 Type return_type;
 263
 264                 /// <summary>
 265                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 266                 ///   to store structures (used to compute the address of the structure
 267                 ///   value on structure method invocations)
 268                 /// </summary>
 269                 Hashtable temporary_storage;
 270
 271                 /// <summary>
 272                 ///   The location where we store the return value.
 273                 /// </summary>
 274                 public LocalBuilder return_value;
 275
 276                 /// <summary>
 277                 ///   The location where return has to jump to return the
 278                 ///   value
 279                 /// </summary>
 280                 public Label ReturnLabel;
 281
 282                 /// <summary>
 283                 ///   If we already defined the ReturnLabel
 284                 /// </summary>
 285                 public bool HasReturnLabel;
 286
 287                 /// <summary>
 288                 ///  Whether we are inside an anonymous method.
 289                 /// </summary>
 290                 public AnonymousExpression CurrentAnonymousMethod;
 291
 292                 public readonly IMemberContext MemberContext;
 293
 294                 public EmitContext (IMemberContext rc, ILGenerator ig, Type return_type)
 295                 {
 296                         this.MemberContext = rc;
 297                         this.ig = ig;
 298
 299                         this.return_type = return_type;
 300                 }
 301
 302                 public Type CurrentType {
 303                         get { return MemberContext.CurrentType; }
 304                 }
 305
 306                 public TypeParameter[] CurrentTypeParameters {
 307                         get { return MemberContext.CurrentTypeParameters; }
 308                 }
 309
 310                 public TypeContainer CurrentTypeDefinition {
 311                         get { return MemberContext.CurrentTypeDefinition; }
 312                 }
 313
 314                 public bool IsStatic {
 315                         get { return MemberContext.IsStatic; }
 316                 }
 317
 318                 public Type ReturnType {
 319                         get {
 320                                 return return_type;
 321                         }
 322                 }
 323
 324                 /// <summary>
 325                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 326                 ///   writer to which source line this opcode belongs.
 327                 /// </summary>
 328                 public void Mark (Location loc)
 329                 {
 330                         if (!SymbolWriter.HasSymbolWriter || HasSet (Options.OmitDebugInfo) || loc.IsNull)
 331                                 return;
 332
 333                         SymbolWriter.MarkSequencePoint (ig, loc);
 334                 }
 335
 336                 public void DefineLocalVariable (string name, LocalBuilder builder)
 337                 {
 338                         SymbolWriter.DefineLocalVariable (name, builder);
 339                 }
 340
 341                 public void BeginScope ()
 342                 {
 343                         ig.BeginScope();
 344                         SymbolWriter.OpenScope(ig);
 345                 }
 346
 347                 public void EndScope ()
 348                 {
 349                         ig.EndScope();
 350                         SymbolWriter.CloseScope(ig);
 351                 }
 352
 353                 /// <summary>
 354                 ///   Returns a temporary storage for a variable of type t as
 355                 ///   a local variable in the current body.
 356                 /// </summary>
 357                 public LocalBuilder GetTemporaryLocal (Type t)
 358                 {
 359                         if (temporary_storage != null) {
 360                                 object o = temporary_storage [t];
 361                                 if (o != null) {
 362                                         if (o is Stack) {
 363                                                 Stack s = (Stack) o;
 364                                                 o = s.Count == 0 ? null : s.Pop ();
 365                                         } else {
 366                                                 temporary_storage.Remove (t);
 367                                         }
 368                                 }
 369                                 if (o != null)
 370                                         return (LocalBuilder) o;
 371                         }
 372                         return ig.DeclareLocal (t);
 373                 }
 374
 375                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 376                 {
 377                         if (temporary_storage == null) {
 378                                 temporary_storage = new Hashtable ();
 379                                 temporary_storage [t] = b;
 380                                 return;
 381                         }
 382                         object o = temporary_storage [t];
 383                         if (o == null) {
 384                                 temporary_storage [t] = b;
 385                                 return;
 386                         }
 387                         Stack s = o as Stack;
 388                         if (s == null) {
 389                                 s = new Stack ();
 390                                 s.Push (o);
 391                                 temporary_storage [t] = s;
 392                         }
 393                         s.Push (b);
 394                 }
 395
 396                 /// <summary>
 397                 ///   Current loop begin and end labels.
 398                 /// </summary>
 399                 public Label LoopBegin, LoopEnd;
 400
 401                 /// <summary>
 402                 ///   Default target in a switch statement.   Only valid if
 403                 ///   InSwitch is true
 404                 /// </summary>
 405                 public Label DefaultTarget;
 406
 407                 /// <summary>
 408                 ///   If this is non-null, points to the current switch statement
 409                 /// </summary>
 410                 public Switch Switch;
 411
 412                 /// <summary>
 413                 ///   ReturnValue creates on demand the LocalBuilder for the
 414                 ///   return value from the function.  By default this is not
 415                 ///   used.  This is only required when returns are found inside
 416                 ///   Try or Catch statements.
 417                 ///
 418                 ///   This method is typically invoked from the Emit phase, so
 419                 ///   we allow the creation of a return label if it was not
 420                 ///   requested during the resolution phase.   Could be cleaned
 421                 ///   up, but it would replicate a lot of logic in the Emit phase
 422                 ///   of the code that uses it.
 423                 /// </summary>
 424                 public LocalBuilder TemporaryReturn ()
 425                 {
 426                         if (return_value == null){
 427                                 return_value = ig.DeclareLocal (return_type);
 428                                 if (!HasReturnLabel){
 429                                         ReturnLabel = ig.DefineLabel ();
 430                                         HasReturnLabel = true;
 431                                 }
 432                         }
 433
 434                         return return_value;
 435                 }
 436         }
 437
 438         public abstract class CommonAssemblyModulClass : Attributable, IMemberContext
 439         {
 440                 public void AddAttributes (ArrayList attrs, IMemberContext context)
 441                 {
 442                         foreach (Attribute a in attrs)
 443                                 a.AttachTo (this, context);
 444
 445                         if (attributes == null) {
 446                                 attributes = new Attributes (attrs);
 447                                 return;
 448                         }
 449                         attributes.AddAttributes (attrs);
 450                 }
 451
 452                 public virtual void Emit (TypeContainer tc)
 453                 {
 454                         if (OptAttributes == null)
 455                                 return;
 456
 457                         OptAttributes.Emit ();
 458                 }
 459
 460                 protected Attribute ResolveAttribute (PredefinedAttribute a_type)
 461                 {
 462                         Attribute a = OptAttributes.Search (a_type);
 463                         if (a != null) {
 464                                 a.Resolve ();
 465                         }
 466                         return a;
 467                 }
 468
 469                 #region IMemberContext Members
 470
 471                 public CompilerContext Compiler {
 472                         get { return RootContext.ToplevelTypes.Compiler; }
 473                 }
 474
 475                 public Type CurrentType {
 476                         get { return null; }
 477                 }
 478
 479                 public TypeParameter[] CurrentTypeParameters {
 480                         get { return null; }
 481                 }
 482
 483                 public TypeContainer CurrentTypeDefinition {
 484                         get { return RootContext.ToplevelTypes; }
 485                 }
 486
 487                 public string GetSignatureForError ()
 488                 {
 489                         return "<module>";
 490                 }
 491
 492                 public bool IsObsolete {
 493                         get { return false; }
 494                 }
 495
 496                 public bool IsUnsafe {
 497                         get { return false; }
 498                 }
 499
 500                 public bool IsStatic {
 501                         get { return false; }
 502                 }
 503
 504                 public ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
 505                 {
 506                         throw new NotImplementedException ();
 507                 }
 508
 509                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
 510                 {
 511                         return RootContext.ToplevelTypes.LookupNamespaceOrType (name, loc, ignore_cs0104);
 512                 }
 513
 514                 public FullNamedExpression LookupNamespaceAlias (string name)
 515                 {
 516                         return null;
 517                 }
 518
 519                 #endregion
 520         }
 521
 522         public class AssemblyClass : CommonAssemblyModulClass {
 523                 // TODO: make it private and move all builder based methods here
 524                 public AssemblyBuilder Builder;
 525                 bool is_cls_compliant;
 526                 bool wrap_non_exception_throws;
 527
 528                 public Attribute ClsCompliantAttribute;
 529
 530                 ListDictionary declarative_security;
 531                 bool has_extension_method;
 532                 public AssemblyName Name;
 533                 MethodInfo add_type_forwarder;
 534                 ListDictionary emitted_forwarders;
 535
 536                 // Module is here just because of error messages
 537                 static string[] attribute_targets = new string [] { "assembly", "module" };
 538
 539                 public AssemblyClass ()
 540                 {
 541                         wrap_non_exception_throws = true;
 542                 }
 543
 544                 public bool HasExtensionMethods {
 545                         set {
 546                                 has_extension_method = value;
 547                         }
 548                 }
 549
 550                 public bool IsClsCompliant {
 551                         get {
 552                                 return is_cls_compliant;
 553                         }
 554                 }
 555
 556                 public bool WrapNonExceptionThrows {
 557                         get {
 558                                 return wrap_non_exception_throws;
 559                         }
 560                 }
 561
 562                 public override AttributeTargets AttributeTargets {
 563                         get {
 564                                 return AttributeTargets.Assembly;
 565                         }
 566                 }
 567
 568                 public override bool IsClsComplianceRequired ()
 569                 {
 570                         return is_cls_compliant;
 571                 }
 572
 573                 Report Report {
 574                         get { return Compiler.Report; }
 575                 }
 576
 577                 public void Resolve ()
 578                 {
 579                         if (RootContext.Unsafe) {
 580                                 //
 581                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
 582                                 // when -unsafe option was specified
 583                                 //
 584
 585                                 Location loc = Location.Null;
 586
 587                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
 588                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
 589
 590                                 Arguments pos = new Arguments (1);
 591                                 pos.Add (new Argument (new MemberAccess (new MemberAccess (system_security_permissions, "SecurityAction", loc), "RequestMinimum")));
 592
 593                                 Arguments named = new Arguments (1);
 594                                 named.Add (new NamedArgument (new LocatedToken (loc, "SkipVerification"), (new BoolLiteral (true, loc))));
 595
 596                                 GlobalAttribute g = new GlobalAttribute (new NamespaceEntry (null, null, null), "assembly",
 597                                         new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
 598                                         new Arguments[] { pos, named }, loc, false);
 599                                 g.AttachTo (this, this);
 600
 601                                 if (g.Resolve () != null) {
 602                                         declarative_security = new ListDictionary ();
 603                                         g.ExtractSecurityPermissionSet (declarative_security);
 604                                 }
 605                         }
 606
 607                         if (OptAttributes == null)
 608                                 return;
 609
 610                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
 611                         if (!OptAttributes.CheckTargets())
 612                                 return;
 613
 614                         ClsCompliantAttribute = ResolveAttribute (PredefinedAttributes.Get.CLSCompliant);
 615
 616                         if (ClsCompliantAttribute != null) {
 617                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
 618                         }
 619
 620                         Attribute a = ResolveAttribute (PredefinedAttributes.Get.RuntimeCompatibility);
 621                         if (a != null) {
 622                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
 623                                 if (val != null)
 624                                         wrap_non_exception_throws = (bool) val;
 625                         }
 626                 }
 627
 628                 // fix bug #56621
 629                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
 630                 {
 631                         try {
 632                                 // check for possible ECMA key
 633                                 if (strongNameBlob.Length == 16) {
 634                                         // will be rejected if not "the" ECMA key
 635                                         an.SetPublicKey (strongNameBlob);
 636                                 }
 637                                 else {
 638                                         // take it, with or without, a private key
 639                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
 640                                         // and make sure we only feed the public part to Sys.Ref
 641                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
 642
 643                                         // AssemblyName.SetPublicKey requires an additional header
 644                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
 645
 646                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
 647                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
 648                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
 649                                         an.SetPublicKey (encodedPublicKey);
 650                                 }
 651                         }
 652                         catch (Exception) {
 653                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
 654                                 Environment.Exit (1);
 655                         }
 656                 }
 657
 658                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
 659                 public AssemblyName GetAssemblyName (string name, string output)
 660                 {
 661                         if (OptAttributes != null) {
 662                                 foreach (Attribute a in OptAttributes.Attrs) {
 663                                         // cannot rely on any resolve-based members before you call Resolve
 664                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
 665                                                 continue;
 666
 667                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
 668                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
 669                                         //       are loaded yet.
 670                                         // TODO: Does not handle quoted attributes properly
 671                                         switch (a.Name) {
 672                                         case "AssemblyKeyFile":
 673                                         case "AssemblyKeyFileAttribute":
 674                                         case "System.Reflection.AssemblyKeyFileAttribute":
 675                                                 if (RootContext.StrongNameKeyFile != null) {
 676                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 677                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 678                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
 679                                                 } else {
 680                                                         string value = a.GetString ();
 681                                                         if (value != null && value.Length != 0)
 682                                                                 RootContext.StrongNameKeyFile = value;
 683                                                 }
 684                                                 break;
 685                                         case "AssemblyKeyName":
 686                                         case "AssemblyKeyNameAttribute":
 687                                         case "System.Reflection.AssemblyKeyNameAttribute":
 688                                                 if (RootContext.StrongNameKeyContainer != null) {
 689                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
 690                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
 691                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
 692                                                 } else {
 693                                                         string value = a.GetString ();
 694                                                         if (value != null && value.Length != 0)
 695                                                                 RootContext.StrongNameKeyContainer = value;
 696                                                 }
 697                                                 break;
 698                                         case "AssemblyDelaySign":
 699                                         case "AssemblyDelaySignAttribute":
 700                                         case "System.Reflection.AssemblyDelaySignAttribute":
 701                                                 RootContext.StrongNameDelaySign = a.GetBoolean ();
 702                                                 break;
 703                                         }
 704                                 }
 705                         }
 706
 707                         AssemblyName an = new AssemblyName ();
 708                         an.Name = Path.GetFileNameWithoutExtension (name);
 709
 710                         // note: delay doesn't apply when using a key container
 711                         if (RootContext.StrongNameKeyContainer != null) {
 712                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
 713                                 return an;
 714                         }
 715
 716                         // strongname is optional
 717                         if (RootContext.StrongNameKeyFile == null)
 718                                 return an;
 719
 720                         string AssemblyDir = Path.GetDirectoryName (output);
 721
 722                         // the StrongName key file may be relative to (a) the compiled
 723                         // file or (b) to the output assembly. See bugzilla #55320
 724                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
 725
 726                         // (a) relative to the compiled file
 727                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
 728                         bool exist = File.Exists (filename);
 729                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
 730                                 // (b) relative to the outputed assembly
 731                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
 732                                 exist = File.Exists (filename);
 733                         }
 734
 735                         if (exist) {
 736                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
 737                                         byte[] snkeypair = new byte [fs.Length];
 738                                         fs.Read (snkeypair, 0, snkeypair.Length);
 739
 740                                         if (RootContext.StrongNameDelaySign) {
 741                                                 // delayed signing - DO NOT include private key
 742                                                 SetPublicKey (an, snkeypair);
 743                                         }
 744                                         else {
 745                                                 // no delay so we make sure we have the private key
 746                                                 try {
 747                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
 748                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
 749                                                 }
 750                                                 catch (CryptographicException) {
 751                                                         if (snkeypair.Length == 16) {
 752                                                                 // error # is different for ECMA key
 753                                                                 Report.Error (1606, "Could not sign the assembly. " +
 754                                                                         "ECMA key can only be used to delay-sign assemblies");
 755                                                         }
 756                                                         else {
 757                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
 758                                                         }
 759                                                         return null;
 760                                                 }
 761                                         }
 762                                 }
 763                         }
 764                         else {
 765                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
 766                                 return null;
 767                         }
 768                         return an;
 769                 }
 770
 771                 void Error_AssemblySigning (string text)
 772                 {
 773                         Report.Error (1548, "Error during assembly signing. " + text);
 774                 }
 775
 776                 bool CheckInternalsVisibleAttribute (Attribute a)
 777                 {
 778                         string assembly_name = a.GetString ();
 779                         if (assembly_name.Length == 0)
 780                                 return false;
 781
 782                         AssemblyName aname = null;
 783                         try {
 784 #if GMCS_SOURCE
 785                                 aname = new AssemblyName (assembly_name);
 786 #else
 787                                 throw new NotSupportedException ();
 788 #endif
 789                         } catch (FileLoadException) {
 790                         } catch (ArgumentException) {
 791                         }
 792
 793                         // Bad assembly name format
 794                         if (aname == null)
 795                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
 796                         // Report error if we have defined Version or Culture
 797                         else if (aname.Version != null || aname.CultureInfo != null)
 798                                 throw new Exception ("Friend assembly `" + a.GetString () +
 799                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
 800                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null && Name.GetPublicKey ().Length != 0) {
 801                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
 802                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
 803                                 return false;
 804                         }
 805
 806                         return true;
 807                 }
 808
 809                 static bool IsValidAssemblyVersion (string version)
 810                 {
 811                         Version v;
 812                         try {
 813                                 v = new Version (version);
 814                         } catch {
 815                                 try {
 816                                         int major = int.Parse (version, CultureInfo.InvariantCulture);
 817                                         v = new Version (major, 0);
 818                                 } catch {
 819                                         return false;
 820                                 }
 821                         }
 822
 823                         foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
 824                                 if (candidate > ushort.MaxValue)
 825                                         return false;
 826                         }
 827
 828                         return true;
 829                 }
 830
 831                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
 832                 {
 833                         if (a.IsValidSecurityAttribute ()) {
 834                                 if (declarative_security == null)
 835                                         declarative_security = new ListDictionary ();
 836
 837                                 a.ExtractSecurityPermissionSet (declarative_security);
 838                                 return;
 839                         }
 840
 841                         if (a.Type == pa.AssemblyCulture) {
 842                                 string value = a.GetString ();
 843                                 if (value == null || value.Length == 0)
 844                                         return;
 845
 846                                 if (RootContext.Target == Target.Exe) {
 847                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
 848                                         return;
 849                                 }
 850                         }
 851
 852                         if (a.Type == pa.AssemblyVersion) {
 853                                 string value = a.GetString ();
 854                                 if (value == null || value.Length == 0)
 855                                         return;
 856
 857                                 value = value.Replace ('*', '0');
 858
 859                                 if (!IsValidAssemblyVersion (value)) {
 860                                         a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
 861                                         return;
 862                                 }
 863                         }
 864
 865                         if (a.Type == pa.InternalsVisibleTo && !CheckInternalsVisibleAttribute (a))
 866                                 return;
 867
 868                         if (a.Type == pa.TypeForwarder) {
 869                                 Type t = a.GetArgumentType ();
 870                                 if (t == null || TypeManager.HasElementType (t)) {
 871                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
 872                                         return;
 873                                 }
 874
 875                                 t = TypeManager.DropGenericTypeArguments (t);
 876                                 if (emitted_forwarders == null) {
 877                                         emitted_forwarders = new ListDictionary();
 878                                 } else if (emitted_forwarders.Contains(t)) {
 879                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
 880                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
 881                                                 TypeManager.CSharpName(t));
 882                                         return;
 883                                 }
 884
 885                                 emitted_forwarders.Add(t, a);
 886
 887                                 if (TypeManager.LookupDeclSpace (t) != null) {
 888                                         Report.SymbolRelatedToPreviousError (t);
 889                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
 890                                                 TypeManager.CSharpName (t));
 891                                         return;
 892                                 }
 893
 894                                 if (t.DeclaringType != null) {
 895                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
 896                                                 TypeManager.CSharpName (t));
 897                                         return;
 898                                 }
 899
 900                                 if (add_type_forwarder == null) {
 901                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
 902                                                 BindingFlags.NonPublic | BindingFlags.Instance);
 903
 904                                         if (add_type_forwarder == null) {
 905                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
 906                                                 return;
 907                                         }
 908                                 }
 909
 910                                 add_type_forwarder.Invoke (Builder, new object[] { t });
 911                                 return;
 912                         }
 913
 914                         if (a.Type == pa.Extension) {
 915                                 a.Error_MisusedExtensionAttribute ();
 916                                 return;
 917                         }
 918
 919                         Builder.SetCustomAttribute (cb);
 920                 }
 921
 922                 public override void Emit (TypeContainer tc)
 923                 {
 924                         base.Emit (tc);
 925
 926                         if (has_extension_method)
 927                                 PredefinedAttributes.Get.Extension.EmitAttribute (Builder);
 928
 929                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
 930                         PredefinedAttribute pa = PredefinedAttributes.Get.RuntimeCompatibility;
 931                         if (pa.IsDefined && (OptAttributes == null || !OptAttributes.Contains (pa))) {
 932                                 ConstructorInfo ci = TypeManager.GetPredefinedConstructor (
 933                                         pa.Type, Location.Null, Type.EmptyTypes);
 934                                 PropertyInfo [] pis = new PropertyInfo [1];
 935                                 pis [0] = TypeManager.GetPredefinedProperty (pa.Type,
 936                                         "WrapNonExceptionThrows", Location.Null, TypeManager.bool_type);
 937                                 object [] pargs = new object [1];
 938                                 pargs [0] = true;
 939                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
 940                         }
 941
 942                         if (declarative_security != null) {
 943
 944                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
 945                                 object builder_instance = Builder;
 946
 947                                 try {
 948                                         // Microsoft runtime hacking
 949                                         if (add_permission == null) {
 950                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
 951                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
 952
 953                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
 954                                                 builder_instance = fi.GetValue (Builder);
 955                                         }
 956
 957                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
 958                                                                                                   declarative_security [SecurityAction.RequestOptional],
 959                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
 960                                         add_permission.Invoke (builder_instance, args);
 961                                 }
 962                                 catch {
 963                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
 964                                 }
 965                         }
 966                 }
 967
 968                 public override string[] ValidAttributeTargets {
 969                         get {
 970                                 return attribute_targets;
 971                         }
 972                 }
 973
 974                 // Wrapper for AssemblyBuilder.AddModule
 975                 static MethodInfo adder_method;
 976                 static public MethodInfo AddModule_Method {
 977                         get {
 978                                 if (adder_method == null)
 979                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
 980                                 return adder_method;
 981                         }
 982                 }
 983                 public Module AddModule (string module)
 984                 {
 985                         MethodInfo m = AddModule_Method;
 986                         if (m == null) {
 987                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
 988                                 Environment.Exit (1);
 989                         }
 990
 991                         try {
 992                                 return (Module) m.Invoke (Builder, new object [] { module });
 993                         } catch (TargetInvocationException ex) {
 994                                 throw ex.InnerException;
 995                         }
 996                 }
 997         }
 998 }