mcs/gmcs/codegen.cs

   1 //
   2 // codegen.cs: The code generator
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) 2001, 2002, 2003 Ximian, Inc.
   8 // (C) 2004 Novell, Inc.
   9 //
  10
  11 #if !DEBUG
  12         #define PRODUCTION
  13 #endif
  14
  15 using System;
  16 using System.IO;
  17 using System.Collections;
  18 using System.Collections.Specialized;
  19 using System.Reflection;
  20 using System.Reflection.Emit;
  21 using System.Runtime.InteropServices;
  22 using System.Security;
  23 using System.Security.Cryptography;
  24 using System.Security.Permissions;
  25
  26 using Mono.Security.Cryptography;
  27
  28 namespace Mono.CSharp {
  29
  30         /// <summary>
  31         ///    Code generator class.
  32         /// </summary>
  33         public class CodeGen {
  34                 static AppDomain current_domain;
  35                 static public SymbolWriter SymbolWriter;
  36
  37                 public static AssemblyClass Assembly;
  38                 public static ModuleClass Module;
  39
  40                 static CodeGen ()
  41                 {
  42                         Reset ();
  43                 }
  44
  45                 public static void Reset ()
  46                 {
  47                         Assembly = new AssemblyClass ();
  48                         Module = new ModuleClass (RootContext.Unsafe);
  49                 }
  50
  51                 public static string Basename (string name)
  52                 {
  53                         int pos = name.LastIndexOf ('/');
  54
  55                         if (pos != -1)
  56                                 return name.Substring (pos + 1);
  57
  58                         pos = name.LastIndexOf ('\\');
  59                         if (pos != -1)
  60                                 return name.Substring (pos + 1);
  61
  62                         return name;
  63                 }
  64
  65                 public static string Dirname (string name)
  66                 {
  67                         int pos = name.LastIndexOf ('/');
  68
  69                         if (pos != -1)
  70                                 return name.Substring (0, pos);
  71
  72                         pos = name.LastIndexOf ('\\');
  73                         if (pos != -1)
  74                                 return name.Substring (0, pos);
  75
  76                         return ".";
  77                 }
  78
  79                 static public string FileName;
  80
  81                 //
  82                 // Initializes the symbol writer
  83                 //
  84                 static void InitializeSymbolWriter (string filename)
  85                 {
  86                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  87
  88                         //
  89                         // If we got an ISymbolWriter instance, initialize it.
  90                         //
  91                         if (SymbolWriter == null) {
  92                                 Report.Warning (
  93                                         -18, "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll). This is normally an installation problem. Please make sure to compile and install the mcs/class/Mono.CompilerServices.SymbolWriter directory.");
  94                                 return;
  95                         }
  96                 }
  97
  98                 //
  99                 // Initializes the code generator variables
 100                 //
 101                 static public bool Init (string name, string output, bool want_debugging_support)
 102                 {
 103                         FileName = output;
 104                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 105                         if (an == null)
 106                                 return false;
 107
 108                         if (an.KeyPair != null) {
 109                                 // If we are going to strong name our assembly make
 110                                 // sure all its refs are strong named
 111                                 foreach (Assembly a in TypeManager.GetAssemblies ()) {
 112                                         AssemblyName ref_name = a.GetName ();
 113                                         byte [] b = ref_name.GetPublicKeyToken ();
 114                                         if (b == null || b.Length == 0) {
 115                                                 Report.Warning (1577, "Assembly generation failed " +
 116                                                                 "-- Referenced assembly '" +
 117                                                                 ref_name.Name +
 118                                                                 "' does not have a strong name.");
 119                                                 //Environment.Exit (1);
 120                                         }
 121                                 }
 122                         }
 123
 124                         current_domain = AppDomain.CurrentDomain;
 125
 126                         try {
 127                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 128                                         AssemblyBuilderAccess.Save, Dirname (name));
 129                         }
 130                         catch (ArgumentException) {
 131                                 // specified key may not be exportable outside it's container
 132                                 if (RootContext.StrongNameKeyContainer != null) {
 133                                         Report.Error (1548, "Could not access the key inside the container `" +
 134                                                 RootContext.StrongNameKeyContainer + "'.");
 135                                         Environment.Exit (1);
 136                                 }
 137                                 return false;
 138                         }
 139                         catch (CryptographicException) {
 140                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 141                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 142                                         Environment.Exit (1);
 143                                 }
 144                                 return false;
 145                         }
 146
 147                         //
 148                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 149                         // this copes with output in different directories then.
 150                         // FIXME: figure out how this copes with --output /tmp/blah
 151                         //
 152                         // If the third argument is true, the ModuleBuilder will dynamically
 153                         // load the default symbol writer.
 154                         //
 155                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 156                                 Basename (name), Basename (output), false);
 157
 158                         if (want_debugging_support)
 159                                 InitializeSymbolWriter (output);
 160
 161                         return true;
 162                 }
 163
 164                 static public void Save (string name)
 165                 {
 166                         try {
 167                                 Assembly.Builder.Save (Basename (name));
 168                         }
 169                         catch (COMException) {
 170                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 171                                         throw;
 172
 173                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 174                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 175                                         RootContext.StrongNameKeyFile +
 176                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 177                         }
 178                         catch (System.IO.IOException io) {
 179                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 180                         }
 181                         catch (System.UnauthorizedAccessException ua) {
 182                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 183                         }
 184
 185                         if (SymbolWriter != null)
 186                                 SymbolWriter.WriteSymbolFile ();
 187                 }
 188         }
 189
 190         /// <summary>
 191         ///   An Emit Context is created for each body of code (from methods,
 192         ///   properties bodies, indexer bodies or constructor bodies)
 193         /// </summary>
 194         public class EmitContext {
 195                 public readonly DeclSpace DeclSpace;
 196                 public DeclSpace TypeContainer;
 197                 public ILGenerator   ig;
 198
 199                 /// <summary>
 200                 ///   This variable tracks the `checked' state of the compilation,
 201                 ///   it controls whether we should generate code that does overflow
 202                 ///   checking, or if we generate code that ignores overflows.
 203                 ///
 204                 ///   The default setting comes from the command line option to generate
 205                 ///   checked or unchecked code plus any source code changes using the
 206                 ///   checked/unchecked statements or expressions.   Contrast this with
 207                 ///   the ConstantCheckState flag.
 208                 /// </summary>
 209
 210                 public bool CheckState;
 211
 212                 /// <summary>
 213                 ///   The constant check state is always set to `true' and cant be changed
 214                 ///   from the command line.  The source code can change this setting with
 215                 ///   the `checked' and `unchecked' statements and expressions.
 216                 /// </summary>
 217                 public bool ConstantCheckState;
 218
 219                 /// <summary>
 220                 ///   Whether we are emitting code inside a static or instance method
 221                 /// </summary>
 222                 public bool IsStatic;
 223
 224                 /// <summary>
 225                 ///   Whether the actual created method is static or instance method.
 226                 ///   Althoug the method might be declared as `static', if an anonymous
 227                 ///   method is involved, we might turn this into an instance method.
 228                 ///
 229                 ///   So this reflects the low-level staticness of the method, while
 230                 ///   IsStatic represents the semantic, high-level staticness.
 231                 /// </summary>
 232                 public bool MethodIsStatic;
 233
 234                 /// <summary>
 235                 ///   Whether we are emitting a field initializer
 236                 /// </summary>
 237                 public bool IsFieldInitializer;
 238
 239                 /// <summary>
 240                 ///   We are resolving a class'es base class and interfaces.
 241                 /// </summary>
 242                 public bool ResolvingTypeTree;
 243
 244                 /// <summary>
 245                 ///   The value that is allowed to be returned or NULL if there is no
 246                 ///   return type.
 247                 /// </summary>
 248                 public Type ReturnType;
 249
 250                 /// <summary>
 251                 ///   Points to the Type (extracted from the TypeContainer) that
 252                 ///   declares this body of code
 253                 /// </summary>
 254                 public Type ContainerType;
 255
 256                 /// <summary>
 257                 ///   Whether this is generating code for a constructor
 258                 /// </summary>
 259                 public bool IsConstructor;
 260
 261                 /// <summary>
 262                 ///   Whether we're control flow analysis enabled
 263                 /// </summary>
 264                 public bool DoFlowAnalysis;
 265
 266                 /// <summary>
 267                 ///   Whether we're control flow analysis disabled on struct
 268                 /// </summary>
 269                 public bool OmitStructFlowAnalysis;
 270
 271                 /// <summary>
 272                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 273                 ///   to store structures (used to compute the address of the structure
 274                 ///   value on structure method invocations)
 275                 /// </summary>
 276                 public Hashtable temporary_storage;
 277
 278                 public Block CurrentBlock;
 279
 280                 public int CurrentFile;
 281
 282                 /// <summary>
 283                 ///   The location where we store the return value.
 284                 /// </summary>
 285                 LocalBuilder return_value;
 286
 287                 /// <summary>
 288                 ///   The location where return has to jump to return the
 289                 ///   value
 290                 /// </summary>
 291                 public Label ReturnLabel;
 292
 293                 /// <summary>
 294                 ///   If we already defined the ReturnLabel
 295                 /// </summary>
 296                 public bool HasReturnLabel;
 297
 298                 /// <summary>
 299                 ///   Whether we are inside an iterator block.
 300                 /// </summary>
 301                 public bool InIterator;
 302
 303                 public bool IsLastStatement;
 304
 305                 /// <summary>
 306                 ///  Whether we are inside an unsafe block
 307                 /// </summary>
 308                 public bool InUnsafe;
 309
 310                 /// <summary>
 311                 ///  Whether we are in a `fixed' initialization
 312                 /// </summary>
 313                 public bool InFixedInitializer;
 314
 315                 public bool InRefOutArgumentResolving;
 316
 317                 public bool InCatch;
 318                 public bool InFinally;
 319
 320                 /// <summary>
 321                 ///  Whether we are inside an anonymous method.
 322                 /// </summary>
 323                 public AnonymousContainer CurrentAnonymousMethod;
 324
 325                 /// <summary>
 326                 ///   Location for this EmitContext
 327                 /// </summary>
 328                 public Location loc;
 329
 330                 /// <summary>
 331                 ///   Inside an enum definition, we do not resolve enumeration values
 332                 ///   to their enumerations, but rather to the underlying type/value
 333                 ///   This is so EnumVal + EnumValB can be evaluated.
 334                 ///
 335                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 336                 ///   we relax the rules
 337                 /// </summary>
 338                 public bool InEnumContext;
 339
 340                 /// <summary>
 341                 ///   Anonymous methods can capture local variables and fields,
 342                 ///   this object tracks it.  It is copied from the TopLevelBlock
 343                 ///   field.
 344                 /// </summary>
 345                 public CaptureContext capture_context;
 346
 347                 /// <summary>
 348                 /// Trace when method is called and is obsolete then this member suppress message
 349                 /// when call is inside next [Obsolete] method or type.
 350                 /// </summary>
 351                 public bool TestObsoleteMethodUsage = true;
 352
 353                 /// <summary>
 354                 ///    The current iterator
 355                 /// </summary>
 356                 public Iterator CurrentIterator {
 357                         get {
 358                                 if (CurrentAnonymousMethod != null)
 359                                         return CurrentAnonymousMethod.Iterator;
 360                                 else
 361                                         return null;
 362                         }
 363                 }
 364
 365                 /// <summary>
 366                 ///    Whether we are in the resolving stage or not
 367                 /// </summary>
 368                 enum Phase {
 369                         Created,
 370                         Resolving,
 371                         Emitting
 372                 }
 373
 374                 Phase current_phase;
 375                 FlowBranching current_flow_branching;
 376
 377                 static int next_id = 0;
 378                 int id = ++next_id;
 379
 380                 public override string ToString ()
 381                 {
 382                         return String.Format ("EmitContext ({0}:{1}:{2})", id,
 383                                               CurrentIterator, capture_context, loc);
 384                 }
 385
 386                 public EmitContext (DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 387                                     Type return_type, int code_flags, bool is_constructor)
 388                 {
 389                         this.ig = ig;
 390
 391                         TypeContainer = parent;
 392                         DeclSpace = ds;
 393                         CheckState = RootContext.Checked;
 394                         ConstantCheckState = true;
 395
 396                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 397                                 throw new InternalErrorException ();
 398
 399                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 400                         MethodIsStatic = IsStatic;
 401                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 402                         ReturnType = return_type;
 403                         IsConstructor = is_constructor;
 404                         CurrentBlock = null;
 405                         CurrentFile = 0;
 406                         current_phase = Phase.Created;
 407
 408                         if (parent != null){
 409                                 // Can only be null for the ResolveType contexts.
 410                                 ContainerType = parent.TypeBuilder;
 411                                 if (parent.UnsafeContext)
 412                                         InUnsafe = true;
 413                                 else
 414                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 415                         }
 416                         loc = l;
 417
 418                         if (ReturnType == TypeManager.void_type)
 419                                 ReturnType = null;
 420                 }
 421
 422                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 423                                     Type return_type, int code_flags, bool is_constructor)
 424                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 425                 {
 426                 }
 427
 428                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 429                                     Type return_type, int code_flags)
 430                         : this (tc, tc, l, ig, return_type, code_flags, false)
 431                 {
 432                 }
 433
 434                 public FlowBranching CurrentBranching {
 435                         get {
 436                                 return current_flow_branching;
 437                         }
 438                 }
 439
 440                 public bool HaveCaptureInfo {
 441                         get {
 442                                 return capture_context != null;
 443                         }
 444                 }
 445
 446                 // <summary>
 447                 //   Starts a new code branching.  This inherits the state of all local
 448                 //   variables and parameters from the current branching.
 449                 // </summary>
 450                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 451                 {
 452                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 453                         return current_flow_branching;
 454                 }
 455
 456                 // <summary>
 457                 //   Starts a new code branching for block `block'.
 458                 // </summary>
 459                 public FlowBranching StartFlowBranching (Block block)
 460                 {
 461                         FlowBranching.BranchingType type;
 462
 463                         if ((CurrentBranching != null) &&
 464                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 465                                 type = FlowBranching.BranchingType.SwitchSection;
 466                         else
 467                                 type = FlowBranching.BranchingType.Block;
 468
 469                         DoFlowAnalysis = true;
 470
 471                         current_flow_branching = FlowBranching.CreateBranching (
 472                                 CurrentBranching, type, block, block.StartLocation);
 473                         return current_flow_branching;
 474                 }
 475
 476                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 477                 {
 478                         FlowBranchingException branching = new FlowBranchingException (
 479                                 CurrentBranching, stmt);
 480                         current_flow_branching = branching;
 481                         return branching;
 482                 }
 483
 484                 // <summary>
 485                 //   Ends a code branching.  Merges the state of locals and parameters
 486                 //   from all the children of the ending branching.
 487                 // </summary>
 488                 public FlowBranching.UsageVector DoEndFlowBranching ()
 489                 {
 490                         FlowBranching old = current_flow_branching;
 491                         current_flow_branching = current_flow_branching.Parent;
 492
 493                         return current_flow_branching.MergeChild (old);
 494                 }
 495
 496                 // <summary>
 497                 //   Ends a code branching.  Merges the state of locals and parameters
 498                 //   from all the children of the ending branching.
 499                 // </summary>
 500                 public FlowBranching.Reachability EndFlowBranching ()
 501                 {
 502                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 503
 504                         return vector.Reachability;
 505                 }
 506
 507                 // <summary>
 508                 //   Kills the current code branching.  This throws away any changed state
 509                 //   information and should only be used in case of an error.
 510                 // </summary>
 511                 public void KillFlowBranching ()
 512                 {
 513                         current_flow_branching = current_flow_branching.Parent;
 514                 }
 515
 516                 public void CaptureVariable (LocalInfo li)
 517                 {
 518                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 519                         li.IsCaptured = true;
 520                 }
 521
 522                 public void CaptureParameter (string name, Type t, int idx)
 523                 {
 524                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 525                 }
 526
 527                 public void CaptureThis ()
 528                 {
 529                         capture_context.CaptureThis (CurrentAnonymousMethod);
 530                 }
 531
 532
 533                 //
 534                 // Use to register a field as captured
 535                 //
 536                 public void CaptureField (FieldExpr fe)
 537                 {
 538                         capture_context.AddField (this, CurrentAnonymousMethod, fe);
 539                 }
 540
 541                 //
 542                 // Whether anonymous methods have captured variables
 543                 //
 544                 public bool HaveCapturedVariables ()
 545                 {
 546                         if (capture_context != null)
 547                                 return capture_context.HaveCapturedVariables;
 548                         return false;
 549                 }
 550
 551                 //
 552                 // Whether anonymous methods have captured fields or this.
 553                 //
 554                 public bool HaveCapturedFields ()
 555                 {
 556                         if (capture_context != null)
 557                                 return capture_context.HaveCapturedFields;
 558                         return false;
 559                 }
 560
 561                 //
 562                 // Emits the instance pointer for the host method
 563                 //
 564                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 565                 {
 566                         if (capture_context != null)
 567                                 capture_context.EmitMethodHostInstance (target, am);
 568                         else if (IsStatic)
 569                                 target.ig.Emit (OpCodes.Ldnull);
 570                         else
 571                                 target.ig.Emit (OpCodes.Ldarg_0);
 572                 }
 573
 574                 //
 575                 // Returns whether the `local' variable has been captured by an anonymous
 576                 // method
 577                 //
 578                 public bool IsCaptured (LocalInfo local)
 579                 {
 580                         return capture_context.IsCaptured (local);
 581                 }
 582
 583                 public bool IsParameterCaptured (string name)
 584                 {
 585                         if (capture_context != null)
 586                                 return capture_context.IsParameterCaptured (name);
 587                         return false;
 588                 }
 589
 590                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 591                 {
 592                         if (capture_context != null)
 593                                 capture_context.EmitAnonymousHelperClasses (this);
 594                         b.EmitMeta (this);
 595
 596                         if (HasReturnLabel)
 597                                 ReturnLabel = ig.DefineLabel ();
 598                 }
 599
 600                 //
 601                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 602                 // currently can not cope with ig == null during resolve (which must
 603                 // be fixed for switch statements to work on anonymous methods).
 604                 //
 605                 public void EmitTopBlock (IMethodData md, ToplevelBlock block, InternalParameters ip)
 606                 {
 607                         if (block == null)
 608                                 return;
 609
 610                         bool unreachable;
 611
 612                         if (ResolveTopBlock (null, block, ip, md, out unreachable)){
 613                                 EmitMeta (block, ip);
 614
 615                                 current_phase = Phase.Emitting;
 616                                 EmitResolvedTopBlock (block, unreachable);
 617                         }
 618                 }
 619
 620                 bool resolved;
 621
 622                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 623                                              InternalParameters ip, IMethodData md, out bool unreachable)
 624                 {
 625                         current_phase = Phase.Resolving;
 626
 627                         unreachable = false;
 628
 629                         if (resolved)
 630                                 return true;
 631
 632                         capture_context = block.CaptureContext;
 633
 634                         if (!loc.IsNull)
 635                                 CurrentFile = loc.File;
 636
 637 #if PRODUCTION
 638                         try {
 639 #endif
 640                                 if (!block.ResolveMeta (this, ip))
 641                                         return false;
 642
 643                                 bool old_do_flow_analysis = DoFlowAnalysis;
 644                                 DoFlowAnalysis = true;
 645
 646                                 if (anonymous_method_host != null)
 647                                         current_flow_branching = FlowBranching.CreateBranching (
 648                                                 anonymous_method_host.CurrentBranching,
 649                                                 FlowBranching.BranchingType.Block, block, loc);
 650                                 else
 651                                         current_flow_branching = block.TopLevelBranching;
 652
 653                                 if (!block.Resolve (this)) {
 654                                         current_flow_branching = null;
 655                                         DoFlowAnalysis = old_do_flow_analysis;
 656                                         return false;
 657                                 }
 658
 659                                 FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 660                                 current_flow_branching = null;
 661
 662                                 DoFlowAnalysis = old_do_flow_analysis;
 663
 664                                 if (reachability.AlwaysReturns ||
 665                                     reachability.AlwaysThrows ||
 666                                     reachability.IsUnreachable)
 667                                         unreachable = true;
 668 #if PRODUCTION
 669                         } catch (Exception e) {
 670                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 671                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 672
 673                                         if (CurrentBlock != null){
 674                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 675                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 676                                         }
 677                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 678                                 throw;
 679                         }
 680 #endif
 681
 682                         if (ReturnType != null && !unreachable) {
 683                                 if (CurrentAnonymousMethod == null) {
 684                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 685                                         return false;
 686                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 687                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 688                                                 CurrentAnonymousMethod.GetSignatureForError ());
 689                                         return false;
 690                                 }
 691                         }
 692
 693                         block.CompleteContexts ();
 694                         resolved = true;
 695                         return true;
 696                 }
 697
 698                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 699                 {
 700                         if (block != null)
 701                                 block.Emit (this);
 702
 703                         if (HasReturnLabel)
 704                                 ig.MarkLabel (ReturnLabel);
 705
 706                         if (return_value != null){
 707                                 ig.Emit (OpCodes.Ldloc, return_value);
 708                                 ig.Emit (OpCodes.Ret);
 709                         } else {
 710                                 //
 711                                 // If `HasReturnLabel' is set, then we already emitted a
 712                                 // jump to the end of the method, so we must emit a `ret'
 713                                 // there.
 714                                 //
 715                                 // Unfortunately, System.Reflection.Emit automatically emits
 716                                 // a leave to the end of a finally block.  This is a problem
 717                                 // if no code is following the try/finally block since we may
 718                                 // jump to a point after the end of the method.
 719                                 // As a workaround, we're always creating a return label in
 720                                 // this case.
 721                                 //
 722
 723                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 724                                         CurrentAnonymousMethod.IsIterator && InIterator;
 725
 726                                 if ((block != null) && block.IsDestructor) {
 727                                         // Nothing to do; S.R.E automatically emits a leave.
 728                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 729                                         if (ReturnType != null)
 730                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 731                                         ig.Emit (OpCodes.Ret);
 732                                 }
 733                         }
 734
 735                         //
 736                         // Close pending helper classes if we are the toplevel
 737                         //
 738                         if (capture_context != null && capture_context.ParentToplevel == null)
 739                                 capture_context.CloseAnonymousHelperClasses ();
 740                 }
 741
 742                 /// <summary>
 743                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 744                 ///   writer to which source line this opcode belongs.
 745                 /// </summary>
 746                 public void Mark (Location loc, bool check_file)
 747                 {
 748                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 749                                 return;
 750
 751                         if (check_file && (CurrentFile != loc.File))
 752                                 return;
 753
 754                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 755                 }
 756
 757                 public void DefineLocalVariable (string name, LocalBuilder builder)
 758                 {
 759                         if (CodeGen.SymbolWriter == null)
 760                                 return;
 761
 762                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 763                 }
 764
 765                 public void BeginScope ()
 766                 {
 767                         ig.BeginScope();
 768
 769                         if (CodeGen.SymbolWriter != null)
 770                                 CodeGen.SymbolWriter.OpenScope(ig);
 771                 }
 772
 773                 public void EndScope ()
 774                 {
 775                         ig.EndScope();
 776
 777                         if (CodeGen.SymbolWriter != null)
 778                                 CodeGen.SymbolWriter.CloseScope(ig);
 779                 }
 780
 781                 /// <summary>
 782                 ///   Returns a temporary storage for a variable of type t as
 783                 ///   a local variable in the current body.
 784                 /// </summary>
 785                 public LocalBuilder GetTemporaryLocal (Type t)
 786                 {
 787                         LocalBuilder location = null;
 788
 789                         if (temporary_storage != null){
 790                                 object o = temporary_storage [t];
 791                                 if (o != null){
 792                                         if (o is ArrayList){
 793                                                 ArrayList al = (ArrayList) o;
 794
 795                                                 for (int i = 0; i < al.Count; i++){
 796                                                         if (al [i] != null){
 797                                                                 location = (LocalBuilder) al [i];
 798                                                                 al [i] = null;
 799                                                                 break;
 800                                                         }
 801                                                 }
 802                                         } else
 803                                                 location = (LocalBuilder) o;
 804                                         if (location != null)
 805                                                 return location;
 806                                 }
 807                         }
 808
 809                         return ig.DeclareLocal (t);
 810                 }
 811
 812                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 813                 {
 814                         if (temporary_storage == null){
 815                                 temporary_storage = new Hashtable ();
 816                                 temporary_storage [t] = b;
 817                                 return;
 818                         }
 819                         object o = temporary_storage [t];
 820                         if (o == null){
 821                                 temporary_storage [t] = b;
 822                                 return;
 823                         }
 824                         if (o is ArrayList){
 825                                 ArrayList al = (ArrayList) o;
 826                                 for (int i = 0; i < al.Count; i++){
 827                                         if (al [i] == null){
 828                                                 al [i] = b;
 829                                                 return;
 830                                         }
 831                                 }
 832                                 al.Add (b);
 833                                 return;
 834                         }
 835                         ArrayList replacement = new ArrayList ();
 836                         replacement.Add (o);
 837                         temporary_storage.Remove (t);
 838                         temporary_storage [t] = replacement;
 839                 }
 840
 841                 /// <summary>
 842                 ///   Current loop begin and end labels.
 843                 /// </summary>
 844                 public Label LoopBegin, LoopEnd;
 845
 846                 /// <summary>
 847                 ///   Default target in a switch statement.   Only valid if
 848                 ///   InSwitch is true
 849                 /// </summary>
 850                 public Label DefaultTarget;
 851
 852                 /// <summary>
 853                 ///   If this is non-null, points to the current switch statement
 854                 /// </summary>
 855                 public Switch Switch;
 856
 857                 /// <summary>
 858                 ///   ReturnValue creates on demand the LocalBuilder for the
 859                 ///   return value from the function.  By default this is not
 860                 ///   used.  This is only required when returns are found inside
 861                 ///   Try or Catch statements.
 862                 ///
 863                 ///   This method is typically invoked from the Emit phase, so
 864                 ///   we allow the creation of a return label if it was not
 865                 ///   requested during the resolution phase.   Could be cleaned
 866                 ///   up, but it would replicate a lot of logic in the Emit phase
 867                 ///   of the code that uses it.
 868                 /// </summary>
 869                 public LocalBuilder TemporaryReturn ()
 870                 {
 871                         if (return_value == null){
 872                                 return_value = ig.DeclareLocal (ReturnType);
 873                                 if (!HasReturnLabel){
 874                                 ReturnLabel = ig.DefineLabel ();
 875                                 HasReturnLabel = true;
 876                         }
 877                         }
 878
 879                         return return_value;
 880                 }
 881
 882                 /// <summary>
 883                 ///   This method is used during the Resolution phase to flag the
 884                 ///   need to define the ReturnLabel
 885                 /// </summary>
 886                 public void NeedReturnLabel ()
 887                 {
 888                         if (current_phase != Phase.Resolving){
 889                                 //
 890                                 // The reason is that the `ReturnLabel' is declared between
 891                                 // resolution and emission
 892                                 //
 893                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 894                         }
 895
 896                         if (!InIterator && !HasReturnLabel)
 897                                 HasReturnLabel = true;
 898                 }
 899
 900                 //
 901                 // Emits the proper object to address fields on a remapped
 902                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 903                 //
 904                 public void EmitThis ()
 905                 {
 906                         ig.Emit (OpCodes.Ldarg_0);
 907                         if (capture_context != null && CurrentAnonymousMethod != null){
 908                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 909                                 while (si != null){
 910                                         if (si.ParentLink != null)
 911                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 912                                         if (si.THIS != null){
 913                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 914                                                 break;
 915                                         }
 916                                         si = si.ParentScope;
 917                                 }
 918                         }
 919                 }
 920
 921                 //
 922                 // Emits the code necessary to load the instance required
 923                 // to access the captured LocalInfo
 924                 //
 925                 public void EmitCapturedVariableInstance (LocalInfo li)
 926                 {
 927                         if (capture_context == null)
 928                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
 929
 930                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
 931                 }
 932
 933                 public void EmitParameter (string name)
 934                 {
 935                         capture_context.EmitParameter (this, name);
 936                 }
 937
 938                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
 939                 {
 940                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
 941                 }
 942
 943                 public void EmitAddressOfParameter (string name)
 944                 {
 945                         capture_context.EmitAddressOfParameter (this, name);
 946                 }
 947
 948                 public Expression GetThis (Location loc)
 949                 {
 950                         This my_this;
 951                         if (CurrentBlock != null)
 952                                 my_this = new This (CurrentBlock, loc);
 953                         else
 954                                 my_this = new This (loc);
 955
 956                         if (!my_this.ResolveBase (this))
 957                                 my_this = null;
 958
 959                         return my_this;
 960                 }
 961         }
 962
 963
 964         public abstract class CommonAssemblyModulClass: Attributable {
 965                 protected CommonAssemblyModulClass ():
 966                         base (null)
 967                 {
 968                 }
 969
 970                 public void AddAttributes (ArrayList attrs)
 971                 {
 972                         if (OptAttributes == null) {
 973                                 OptAttributes = new Attributes (attrs);
 974                                 return;
 975                         }
 976                         OptAttributes.AddAttributes (attrs);
 977                 }
 978
 979                 public virtual void Emit (TypeContainer tc)
 980                 {
 981                         if (OptAttributes == null)
 982                                 return;
 983
 984                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
 985                         OptAttributes.Emit (ec, this);
 986                 }
 987
 988                 protected Attribute ResolveAttribute (Type a_type)
 989                 {
 990                         if (OptAttributes == null)
 991                                 return null;
 992
 993                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
 994                         if (!OptAttributes.CheckTargets (this))
 995                                 return null;
 996
 997                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
 998                         Attribute a = OptAttributes.Search (a_type, temp_ec);
 999                         if (a != null) {
1000                                 a.Resolve (temp_ec);
1001                         }
1002                         return a;
1003                 }
1004         }
1005
1006         public class AssemblyClass: CommonAssemblyModulClass {
1007                 // TODO: make it private and move all builder based methods here
1008                 public AssemblyBuilder Builder;
1009
1010                 bool is_cls_compliant;
1011                 public Attribute ClsCompliantAttribute;
1012
1013                 ListDictionary declarative_security;
1014
1015                 // Module is here just because of error messages
1016                 static string[] attribute_targets = new string [] { "assembly", "module" };
1017
1018                 public AssemblyClass (): base ()
1019                 {
1020                         is_cls_compliant = false;
1021                 }
1022
1023                 public bool IsClsCompliant {
1024                         get {
1025                                 return is_cls_compliant;
1026                         }
1027                         }
1028
1029                 public override AttributeTargets AttributeTargets {
1030                         get {
1031                                 return AttributeTargets.Assembly;
1032                         }
1033                 }
1034
1035                 public override bool IsClsComplianceRequired(DeclSpace ds)
1036                 {
1037                         return is_cls_compliant;
1038                 }
1039
1040                 public void ResolveClsCompliance ()
1041                 {
1042                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1043                         if (ClsCompliantAttribute == null)
1044                                 return;
1045
1046                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1047                 }
1048
1049                 // fix bug #56621
1050                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1051                 {
1052                         try {
1053                                 // check for possible ECMA key
1054                                 if (strongNameBlob.Length == 16) {
1055                                         // will be rejected if not "the" ECMA key
1056                                         an.SetPublicKey (strongNameBlob);
1057                                 }
1058                                 else {
1059                                         // take it, with or without, a private key
1060                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1061                                         // and make sure we only feed the public part to Sys.Ref
1062                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1063
1064                                         // AssemblyName.SetPublicKey requires an additional header
1065                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1066
1067                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1068                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1069                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1070                                         an.SetPublicKey (encodedPublicKey);
1071                                 }
1072                         }
1073                         catch (Exception) {
1074                                 Error_AssemblySigning ("The speficied file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1075                                 Environment.Exit (1);
1076                         }
1077                 }
1078
1079                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1080                 public AssemblyName GetAssemblyName (string name, string output)
1081                 {
1082                         if (OptAttributes != null) {
1083                                foreach (Attribute a in OptAttributes.Attrs) {
1084                                        // cannot rely on any resolve-based members before you call Resolve
1085                                        if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1086                                                continue;
1087
1088                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1089                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1090                                         //       are loaded yet.
1091                                         // TODO: Does not handle quoted attributes properly
1092                                         switch (a.Name) {
1093                                                 case "AssemblyKeyFile":
1094                                                case "AssemblyKeyFileAttribute":
1095                                                case "System.Reflection.AssemblyKeyFileAttribute":
1096                                                         if (RootContext.StrongNameKeyFile != null) {
1097                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1098                                                                 Report.Warning (1616, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1099                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1100                                                         }
1101                                                         else {
1102                                                                 string value = a.GetString ();
1103                                                                 if (value != String.Empty)
1104                                                                         RootContext.StrongNameKeyFile = value;
1105                                                         }
1106                                                         break;
1107                                                 case "AssemblyKeyName":
1108                                                case "AssemblyKeyNameAttribute":
1109                                                case "System.Reflection.AssemblyKeyNameAttribute":
1110                                                         if (RootContext.StrongNameKeyContainer != null) {
1111                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1112                                                                 Report.Warning (1616, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1113                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1114                                                         }
1115                                                         else {
1116                                                                 string value = a.GetString ();
1117                                                                 if (value != String.Empty)
1118                                                                         RootContext.StrongNameKeyContainer = value;
1119                                                         }
1120                                                         break;
1121                                                 case "AssemblyDelaySign":
1122                                                case "AssemblyDelaySignAttribute":
1123                                                case "System.Reflection.AssemblyDelaySignAttribute":
1124                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1125                                                         break;
1126                                         }
1127                                 }
1128                         }
1129
1130                         AssemblyName an = new AssemblyName ();
1131                         an.Name = Path.GetFileNameWithoutExtension (name);
1132
1133                         // note: delay doesn't apply when using a key container
1134                         if (RootContext.StrongNameKeyContainer != null) {
1135                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1136                                 return an;
1137                         }
1138
1139                         // strongname is optional
1140                         if (RootContext.StrongNameKeyFile == null)
1141                                 return an;
1142
1143                         string AssemblyDir = Path.GetDirectoryName (output);
1144
1145                         // the StrongName key file may be relative to (a) the compiled
1146                         // file or (b) to the output assembly. See bugzilla #55320
1147                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1148
1149                         // (a) relative to the compiled file
1150                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1151                         bool exist = File.Exists (filename);
1152                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1153                                 // (b) relative to the outputed assembly
1154                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1155                                 exist = File.Exists (filename);
1156                         }
1157
1158                         if (exist) {
1159                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1160                                         byte[] snkeypair = new byte [fs.Length];
1161                                         fs.Read (snkeypair, 0, snkeypair.Length);
1162
1163                                         if (RootContext.StrongNameDelaySign) {
1164                                                 // delayed signing - DO NOT include private key
1165                                                 SetPublicKey (an, snkeypair);
1166                                         }
1167                                         else {
1168                                                 // no delay so we make sure we have the private key
1169                                                 try {
1170                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1171                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1172                                                 }
1173                                                 catch (CryptographicException) {
1174                                                         if (snkeypair.Length == 16) {
1175                                                                 // error # is different for ECMA key
1176                                                                 Report.Error (1606, "Could not sign the assembly. " +
1177                                                                         "ECMA key can only be used to delay-sign assemblies");
1178                                                         }
1179                                                         else {
1180                                                                 Error_AssemblySigning ("The speficied file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1181                                                         }
1182                                                         return null;
1183                                                 }
1184                                         }
1185                                 }
1186                         }
1187                         else {
1188                                 Error_AssemblySigning ("The speficied file `" + RootContext.StrongNameKeyFile + "' does not exist");
1189                                 return null;
1190                         }
1191                         return an;
1192                 }
1193
1194                 void Error_AssemblySigning (string text)
1195                 {
1196                         Report.Error (1548, "Error during assembly signing. " + text);
1197                 }
1198
1199                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1200                 {
1201                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1202                                 if (declarative_security == null)
1203                                         declarative_security = new ListDictionary ();
1204
1205                                 a.ExtractSecurityPermissionSet (declarative_security);
1206                                 return;
1207                         }
1208
1209                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1210                                 string value = a.GetString ();
1211                                 if (value == null || value.Length == 0)
1212                                         return;
1213
1214                                 if (RootContext.Target == Target.Exe) {
1215                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1216                                         return;
1217                                 }
1218                         }
1219
1220                         Builder.SetCustomAttribute (customBuilder);
1221                 }
1222
1223                 public override void Emit (TypeContainer tc)
1224                 {
1225                         base.Emit (tc);
1226
1227                         if (declarative_security != null) {
1228
1229                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1230                                 object builder_instance = Builder;
1231
1232                                 try {
1233                                         // Microsoft runtime hacking
1234                                         if (add_permission == null) {
1235                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1236                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1237
1238                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1239                                                 builder_instance = fi.GetValue (Builder);
1240                                         }
1241
1242                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1243                                                                                                   declarative_security [SecurityAction.RequestOptional],
1244                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1245                                         add_permission.Invoke (builder_instance, args);
1246                                 }
1247                                 catch {
1248                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1249                                 }
1250                         }
1251                 }
1252
1253                 public override string[] ValidAttributeTargets {
1254                         get {
1255                                 return attribute_targets;
1256                         }
1257                 }
1258         }
1259
1260         public class ModuleClass: CommonAssemblyModulClass {
1261                 // TODO: make it private and move all builder based methods here
1262                 public ModuleBuilder Builder;
1263                 bool m_module_is_unsafe;
1264
1265                 public CharSet DefaultCharSet = CharSet.Ansi;
1266                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1267
1268                 static string[] attribute_targets = new string [] { "module" };
1269
1270                 public ModuleClass (bool is_unsafe)
1271                 {
1272                         m_module_is_unsafe = is_unsafe;
1273                 }
1274
1275                 public override AttributeTargets AttributeTargets {
1276                         get {
1277                                 return AttributeTargets.Module;
1278                         }
1279                 }
1280
1281                 public override bool IsClsComplianceRequired(DeclSpace ds)
1282                 {
1283                         return CodeGen.Assembly.IsClsCompliant;
1284                         }
1285
1286                 public override void Emit (TypeContainer tc)
1287                 {
1288                         base.Emit (tc);
1289
1290                         if (!m_module_is_unsafe)
1291                                 return;
1292
1293                         if (TypeManager.unverifiable_code_ctor == null) {
1294                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1295                                 return;
1296                         }
1297
1298                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1299                 }
1300
1301                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1302                 {
1303                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1304                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1305                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1306                                 }
1307                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1308                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1309                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1310                                         return;
1311                                 }
1312                         }
1313
1314                         Builder.SetCustomAttribute (customBuilder);
1315                 }
1316
1317                 /// <summary>
1318                 /// It is called very early therefore can resolve only predefined attributes
1319                 /// </summary>
1320                 public void ResolveAttributes ()
1321                 {
1322                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1323                         if (a != null) {
1324                                 DefaultCharSet = a.GetCharSetValue ();
1325                                 switch (DefaultCharSet) {
1326                                         case CharSet.Ansi:
1327                                         case CharSet.None:
1328                                                 break;
1329                                         case CharSet.Auto:
1330                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1331                                                 break;
1332                                         case CharSet.Unicode:
1333                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1334                                                 break;
1335                                         default:
1336                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1337                                                 break;
1338                                 }
1339                         }
1340                 }
1341
1342                 public override string[] ValidAttributeTargets {
1343                         get {
1344                                 return attribute_targets;
1345                         }
1346                 }
1347         }
1348 }