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, 1, "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 RootNamespace.Global.Assemblies) {
 112                                         AssemblyName ref_name = a.GetName ();
 113                                         byte [] b = ref_name.GetPublicKeyToken ();
 114                                         if (b == null || b.Length == 0) {
 115                                                 Report.Error (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                         // Get the complete AssemblyName from the builder
 148                         // (We need to get the public key and token)
 149                         Assembly.Name = Assembly.Builder.GetName ();
 150
 151                         //
 152                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 153                         // this copes with output in different directories then.
 154                         // FIXME: figure out how this copes with --output /tmp/blah
 155                         //
 156                         // If the third argument is true, the ModuleBuilder will dynamically
 157                         // load the default symbol writer.
 158                         //
 159                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 160                                 Basename (name), Basename (output), false);
 161
 162                         if (want_debugging_support)
 163                                 InitializeSymbolWriter (output);
 164
 165                         return true;
 166                 }
 167
 168                 static public void Save (string name)
 169                 {
 170                         try {
 171                                 Assembly.Builder.Save (Basename (name));
 172                         }
 173                         catch (COMException) {
 174                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 175                                         throw;
 176
 177                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 178                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 179                                         RootContext.StrongNameKeyFile +
 180                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 181                         }
 182                         catch (System.IO.IOException io) {
 183                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 184                         }
 185                         catch (System.UnauthorizedAccessException ua) {
 186                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 187                         }
 188
 189                         if (SymbolWriter != null)
 190                                 SymbolWriter.WriteSymbolFile ();
 191                 }
 192         }
 193
 194         /// <summary>
 195         ///   An Emit Context is created for each body of code (from methods,
 196         ///   properties bodies, indexer bodies or constructor bodies)
 197         /// </summary>
 198         public class EmitContext {
 199                 public DeclSpace DeclSpace;
 200                 public DeclSpace TypeContainer;
 201                 public ILGenerator   ig;
 202
 203                 /// <summary>
 204                 ///   This variable tracks the `checked' state of the compilation,
 205                 ///   it controls whether we should generate code that does overflow
 206                 ///   checking, or if we generate code that ignores overflows.
 207                 ///
 208                 ///   The default setting comes from the command line option to generate
 209                 ///   checked or unchecked code plus any source code changes using the
 210                 ///   checked/unchecked statements or expressions.   Contrast this with
 211                 ///   the ConstantCheckState flag.
 212                 /// </summary>
 213
 214                 public bool CheckState;
 215
 216                 /// <summary>
 217                 ///   The constant check state is always set to `true' and cant be changed
 218                 ///   from the command line.  The source code can change this setting with
 219                 ///   the `checked' and `unchecked' statements and expressions.
 220                 /// </summary>
 221                 public bool ConstantCheckState;
 222
 223                 /// <summary>
 224                 ///   Whether we are emitting code inside a static or instance method
 225                 /// </summary>
 226                 public bool IsStatic;
 227
 228                 /// <summary>
 229                 ///   Whether the actual created method is static or instance method.
 230                 ///   Althoug the method might be declared as `static', if an anonymous
 231                 ///   method is involved, we might turn this into an instance method.
 232                 ///
 233                 ///   So this reflects the low-level staticness of the method, while
 234                 ///   IsStatic represents the semantic, high-level staticness.
 235                 /// </summary>
 236                 public bool MethodIsStatic;
 237
 238                 /// <summary>
 239                 ///   Whether we are emitting a field initializer
 240                 /// </summary>
 241                 public bool IsFieldInitializer;
 242
 243                 /// <summary>
 244                 ///   We are resolving a class'es base class and interfaces.
 245                 /// </summary>
 246                 public bool ResolvingTypeTree;
 247
 248                 /// <summary>
 249                 ///   We are resolving a generic method's return type and parameters.
 250                 /// </summary>
 251                 public bool ResolvingGenericMethod;
 252
 253                 /// <summary>
 254                 ///   The value that is allowed to be returned or NULL if there is no
 255                 ///   return type.
 256                 /// </summary>
 257                 public Type ReturnType;
 258
 259                 /// <summary>
 260                 ///   Points to the Type (extracted from the TypeContainer) that
 261                 ///   declares this body of code
 262                 /// </summary>
 263                 public Type ContainerType;
 264
 265                 /// <summary>
 266                 ///   Whether this is generating code for a constructor
 267                 /// </summary>
 268                 public bool IsConstructor;
 269
 270                 /// <summary>
 271                 ///   Whether we're control flow analysis enabled
 272                 /// </summary>
 273                 public bool DoFlowAnalysis;
 274
 275                 /// <summary>
 276                 ///   Whether we're control flow analysis disabled on struct
 277                 /// </summary>
 278                 public bool OmitStructFlowAnalysis;
 279
 280                 /// <summary>
 281                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 282                 ///   to store structures (used to compute the address of the structure
 283                 ///   value on structure method invocations)
 284                 /// </summary>
 285                 public Hashtable temporary_storage;
 286
 287                 public Block CurrentBlock;
 288
 289                 public int CurrentFile;
 290
 291                 /// <summary>
 292                 ///   The location where we store the return value.
 293                 /// </summary>
 294                 LocalBuilder return_value;
 295
 296                 /// <summary>
 297                 ///   The location where return has to jump to return the
 298                 ///   value
 299                 /// </summary>
 300                 public Label ReturnLabel;
 301
 302                 /// <summary>
 303                 ///   If we already defined the ReturnLabel
 304                 /// </summary>
 305                 public bool HasReturnLabel;
 306
 307                 /// <summary>
 308                 ///   Whether we are inside an iterator block.
 309                 /// </summary>
 310                 public bool InIterator;
 311
 312                 public bool IsLastStatement;
 313
 314                 /// <summary>
 315                 ///  Whether we are inside an unsafe block
 316                 /// </summary>
 317                 public bool InUnsafe;
 318
 319                 /// <summary>
 320                 ///  Whether we are in a `fixed' initialization
 321                 /// </summary>
 322                 public bool InFixedInitializer;
 323
 324                 public bool InRefOutArgumentResolving;
 325
 326                 public bool InCatch;
 327                 public bool InFinally;
 328
 329                 /// <summary>
 330                 ///  Whether we are inside an anonymous method.
 331                 /// </summary>
 332                 public AnonymousContainer CurrentAnonymousMethod;
 333
 334                 /// <summary>
 335                 ///   Location for this EmitContext
 336                 /// </summary>
 337                 public Location loc;
 338
 339                 /// <summary>
 340                 ///   Inside an enum definition, we do not resolve enumeration values
 341                 ///   to their enumerations, but rather to the underlying type/value
 342                 ///   This is so EnumVal + EnumValB can be evaluated.
 343                 ///
 344                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 345                 ///   we relax the rules
 346                 /// </summary>
 347                 public bool InEnumContext;
 348
 349                 /// <summary>
 350                 ///   Anonymous methods can capture local variables and fields,
 351                 ///   this object tracks it.  It is copied from the TopLevelBlock
 352                 ///   field.
 353                 /// </summary>
 354                 public CaptureContext capture_context;
 355
 356                 /// <summary>
 357                 /// Trace when method is called and is obsolete then this member suppress message
 358                 /// when call is inside next [Obsolete] method or type.
 359                 /// </summary>
 360                 public bool TestObsoleteMethodUsage = true;
 361
 362                 /// <summary>
 363                 ///    The current iterator
 364                 /// </summary>
 365                 public Iterator CurrentIterator {
 366                         get {
 367                                 if (CurrentAnonymousMethod != null)
 368                                         return CurrentAnonymousMethod.Iterator;
 369                                 else
 370                                         return null;
 371                         }
 372                 }
 373
 374                 /// <summary>
 375                 ///    Whether we are in the resolving stage or not
 376                 /// </summary>
 377                 enum Phase {
 378                         Created,
 379                         Resolving,
 380                         Emitting
 381                 }
 382
 383                 Phase current_phase;
 384                 FlowBranching current_flow_branching;
 385
 386                 static int next_id = 0;
 387                 int id = ++next_id;
 388
 389                 public override string ToString ()
 390                 {
 391                         return String.Format ("EmitContext ({0}:{1}:{2})", id,
 392                                               CurrentIterator, capture_context, loc);
 393                 }
 394
 395                 public EmitContext (DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 396                                     Type return_type, int code_flags, bool is_constructor)
 397                 {
 398                         this.ig = ig;
 399
 400                         TypeContainer = parent;
 401                         DeclSpace = ds;
 402                         CheckState = RootContext.Checked;
 403                         ConstantCheckState = true;
 404
 405                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 406                                 throw new InternalErrorException ();
 407
 408                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 409                         MethodIsStatic = IsStatic;
 410                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 411                         ReturnType = return_type;
 412                         IsConstructor = is_constructor;
 413                         CurrentBlock = null;
 414                         CurrentFile = 0;
 415                         current_phase = Phase.Created;
 416
 417                         if (parent != null){
 418                                 // Can only be null for the ResolveType contexts.
 419                                 ContainerType = parent.TypeBuilder;
 420                                 if (parent.UnsafeContext)
 421                                         InUnsafe = true;
 422                                 else
 423                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 424                         }
 425                         loc = l;
 426
 427                         if (ReturnType == TypeManager.void_type)
 428                                 ReturnType = null;
 429                 }
 430
 431                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 432                                     Type return_type, int code_flags, bool is_constructor)
 433                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 434                 {
 435                 }
 436
 437                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 438                                     Type return_type, int code_flags)
 439                         : this (tc, tc, l, ig, return_type, code_flags, false)
 440                 {
 441                 }
 442
 443                 public FlowBranching CurrentBranching {
 444                         get {
 445                                 return current_flow_branching;
 446                         }
 447                 }
 448
 449                 public bool HaveCaptureInfo {
 450                         get {
 451                                 return capture_context != null;
 452                         }
 453                 }
 454
 455                 // <summary>
 456                 //   Starts a new code branching.  This inherits the state of all local
 457                 //   variables and parameters from the current branching.
 458                 // </summary>
 459                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 460                 {
 461                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 462                         return current_flow_branching;
 463                 }
 464
 465                 // <summary>
 466                 //   Starts a new code branching for block `block'.
 467                 // </summary>
 468                 public FlowBranching StartFlowBranching (Block block)
 469                 {
 470                         FlowBranching.BranchingType type;
 471
 472                         if ((CurrentBranching != null) &&
 473                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 474                                 type = FlowBranching.BranchingType.SwitchSection;
 475                         else
 476                                 type = FlowBranching.BranchingType.Block;
 477
 478                         DoFlowAnalysis = true;
 479
 480                         current_flow_branching = FlowBranching.CreateBranching (
 481                                 CurrentBranching, type, block, block.StartLocation);
 482                         return current_flow_branching;
 483                 }
 484
 485                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 486                 {
 487                         FlowBranchingException branching = new FlowBranchingException (
 488                                 CurrentBranching, stmt);
 489                         current_flow_branching = branching;
 490                         return branching;
 491                 }
 492
 493                 // <summary>
 494                 //   Ends a code branching.  Merges the state of locals and parameters
 495                 //   from all the children of the ending branching.
 496                 // </summary>
 497                 public FlowBranching.UsageVector DoEndFlowBranching ()
 498                 {
 499                         FlowBranching old = current_flow_branching;
 500                         current_flow_branching = current_flow_branching.Parent;
 501
 502                         return current_flow_branching.MergeChild (old);
 503                 }
 504
 505                 // <summary>
 506                 //   Ends a code branching.  Merges the state of locals and parameters
 507                 //   from all the children of the ending branching.
 508                 // </summary>
 509                 public FlowBranching.Reachability EndFlowBranching ()
 510                 {
 511                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 512
 513                         return vector.Reachability;
 514                 }
 515
 516                 // <summary>
 517                 //   Kills the current code branching.  This throws away any changed state
 518                 //   information and should only be used in case of an error.
 519                 // </summary>
 520                 public void KillFlowBranching ()
 521                 {
 522                         current_flow_branching = current_flow_branching.Parent;
 523                 }
 524
 525                 public void CaptureVariable (LocalInfo li)
 526                 {
 527                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 528                         li.IsCaptured = true;
 529                 }
 530
 531                 public void CaptureParameter (string name, Type t, int idx)
 532                 {
 533                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 534                 }
 535
 536                 public void CaptureThis ()
 537                 {
 538                         capture_context.CaptureThis (CurrentAnonymousMethod);
 539                 }
 540
 541
 542                 //
 543                 // Use to register a field as captured
 544                 //
 545                 public void CaptureField (FieldExpr fe)
 546                 {
 547                         capture_context.AddField (this, CurrentAnonymousMethod, fe);
 548                 }
 549
 550                 //
 551                 // Whether anonymous methods have captured variables
 552                 //
 553                 public bool HaveCapturedVariables ()
 554                 {
 555                         if (capture_context != null)
 556                                 return capture_context.HaveCapturedVariables;
 557                         return false;
 558                 }
 559
 560                 //
 561                 // Whether anonymous methods have captured fields or this.
 562                 //
 563                 public bool HaveCapturedFields ()
 564                 {
 565                         if (capture_context != null)
 566                                 return capture_context.HaveCapturedFields;
 567                         return false;
 568                 }
 569
 570                 //
 571                 // Emits the instance pointer for the host method
 572                 //
 573                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 574                 {
 575                         if (capture_context != null)
 576                                 capture_context.EmitMethodHostInstance (target, am);
 577                         else if (IsStatic)
 578                                 target.ig.Emit (OpCodes.Ldnull);
 579                         else
 580                                 target.ig.Emit (OpCodes.Ldarg_0);
 581                 }
 582
 583                 //
 584                 // Returns whether the `local' variable has been captured by an anonymous
 585                 // method
 586                 //
 587                 public bool IsCaptured (LocalInfo local)
 588                 {
 589                         return capture_context.IsCaptured (local);
 590                 }
 591
 592                 public bool IsParameterCaptured (string name)
 593                 {
 594                         if (capture_context != null)
 595                                 return capture_context.IsParameterCaptured (name);
 596                         return false;
 597                 }
 598
 599                 public void EmitMeta (ToplevelBlock b)
 600                 {
 601                         if (capture_context != null)
 602                                 capture_context.EmitAnonymousHelperClasses (this);
 603                         b.EmitMeta (this);
 604
 605                         if (HasReturnLabel)
 606                                 ReturnLabel = ig.DefineLabel ();
 607                 }
 608
 609                 //
 610                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 611                 // currently can not cope with ig == null during resolve (which must
 612                 // be fixed for switch statements to work on anonymous methods).
 613                 //
 614                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 615                 {
 616                         if (block == null)
 617                                 return;
 618
 619                         bool unreachable;
 620
 621                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 622                                 EmitMeta (block);
 623
 624                                 current_phase = Phase.Emitting;
 625                                 EmitResolvedTopBlock (block, unreachable);
 626                         }
 627                 }
 628
 629                 bool resolved;
 630
 631                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 632                                              Parameters ip, IMethodData md, out bool unreachable)
 633                 {
 634                         current_phase = Phase.Resolving;
 635
 636                         unreachable = false;
 637
 638                         if (resolved)
 639                                 return true;
 640
 641                         capture_context = block.CaptureContext;
 642
 643                         if (!loc.IsNull)
 644                                 CurrentFile = loc.File;
 645
 646 #if PRODUCTION
 647                         try {
 648 #endif
 649                                 if (!block.ResolveMeta (this, ip))
 650                                         return false;
 651
 652                                 bool old_do_flow_analysis = DoFlowAnalysis;
 653                                 DoFlowAnalysis = true;
 654
 655                                 if (anonymous_method_host != null)
 656                                         current_flow_branching = FlowBranching.CreateBranching (
 657                                                 anonymous_method_host.CurrentBranching,
 658                                                 FlowBranching.BranchingType.Block, block, loc);
 659                                 else
 660                                         current_flow_branching = block.TopLevelBranching;
 661
 662                                 if (!block.Resolve (this)) {
 663                                         current_flow_branching = null;
 664                                         DoFlowAnalysis = old_do_flow_analysis;
 665                                         return false;
 666                                 }
 667
 668                                 FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 669                                 current_flow_branching = null;
 670
 671                                 DoFlowAnalysis = old_do_flow_analysis;
 672
 673                                 if (reachability.AlwaysReturns ||
 674                                     reachability.AlwaysThrows ||
 675                                     reachability.IsUnreachable)
 676                                         unreachable = true;
 677 #if PRODUCTION
 678                         } catch (Exception e) {
 679                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 680                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 681
 682                                         if (CurrentBlock != null){
 683                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 684                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 685                                         }
 686                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 687                                 throw;
 688                         }
 689 #endif
 690
 691                         if (ReturnType != null && !unreachable) {
 692                                 if (CurrentAnonymousMethod == null) {
 693                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 694                                         return false;
 695                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 696                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 697                                                 CurrentAnonymousMethod.GetSignatureForError ());
 698                                         return false;
 699                                 }
 700                         }
 701
 702                         block.CompleteContexts ();
 703                         resolved = true;
 704                         return true;
 705                 }
 706
 707                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 708                 {
 709                         if (block != null)
 710                                 block.Emit (this);
 711
 712                         if (HasReturnLabel)
 713                                 ig.MarkLabel (ReturnLabel);
 714
 715                         if (return_value != null){
 716                                 ig.Emit (OpCodes.Ldloc, return_value);
 717                                 ig.Emit (OpCodes.Ret);
 718                         } else {
 719                                 //
 720                                 // If `HasReturnLabel' is set, then we already emitted a
 721                                 // jump to the end of the method, so we must emit a `ret'
 722                                 // there.
 723                                 //
 724                                 // Unfortunately, System.Reflection.Emit automatically emits
 725                                 // a leave to the end of a finally block.  This is a problem
 726                                 // if no code is following the try/finally block since we may
 727                                 // jump to a point after the end of the method.
 728                                 // As a workaround, we're always creating a return label in
 729                                 // this case.
 730                                 //
 731
 732                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 733                                         CurrentAnonymousMethod.IsIterator && InIterator;
 734
 735                                 if ((block != null) && block.IsDestructor) {
 736                                         // Nothing to do; S.R.E automatically emits a leave.
 737                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 738                                         if (ReturnType != null)
 739                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 740                                         ig.Emit (OpCodes.Ret);
 741                                 }
 742                         }
 743
 744                         //
 745                         // Close pending helper classes if we are the toplevel
 746                         //
 747                         if (capture_context != null && capture_context.ParentToplevel == null)
 748                                 capture_context.CloseAnonymousHelperClasses ();
 749                 }
 750
 751                 /// <summary>
 752                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 753                 ///   writer to which source line this opcode belongs.
 754                 /// </summary>
 755                 public void Mark (Location loc, bool check_file)
 756                 {
 757                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 758                                 return;
 759
 760                         if (check_file && (CurrentFile != loc.File))
 761                                 return;
 762
 763                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 764                 }
 765
 766                 public void DefineLocalVariable (string name, LocalBuilder builder)
 767                 {
 768                         if (CodeGen.SymbolWriter == null)
 769                                 return;
 770
 771                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 772                 }
 773
 774                 public void BeginScope ()
 775                 {
 776                         ig.BeginScope();
 777
 778                         if (CodeGen.SymbolWriter != null)
 779                                 CodeGen.SymbolWriter.OpenScope(ig);
 780                 }
 781
 782                 public void EndScope ()
 783                 {
 784                         ig.EndScope();
 785
 786                         if (CodeGen.SymbolWriter != null)
 787                                 CodeGen.SymbolWriter.CloseScope(ig);
 788                 }
 789
 790                 /// <summary>
 791                 ///   Returns a temporary storage for a variable of type t as
 792                 ///   a local variable in the current body.
 793                 /// </summary>
 794                 public LocalBuilder GetTemporaryLocal (Type t)
 795                 {
 796                         LocalBuilder location = null;
 797
 798                         if (temporary_storage != null){
 799                                 object o = temporary_storage [t];
 800                                 if (o != null){
 801                                         if (o is ArrayList){
 802                                                 ArrayList al = (ArrayList) o;
 803
 804                                                 for (int i = 0; i < al.Count; i++){
 805                                                         if (al [i] != null){
 806                                                                 location = (LocalBuilder) al [i];
 807                                                                 al [i] = null;
 808                                                                 break;
 809                                                         }
 810                                                 }
 811                                         } else
 812                                                 location = (LocalBuilder) o;
 813                                         if (location != null)
 814                                                 return location;
 815                                 }
 816                         }
 817
 818                         return ig.DeclareLocal (t);
 819                 }
 820
 821                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 822                 {
 823                         if (temporary_storage == null){
 824                                 temporary_storage = new Hashtable ();
 825                                 temporary_storage [t] = b;
 826                                 return;
 827                         }
 828                         object o = temporary_storage [t];
 829                         if (o == null){
 830                                 temporary_storage [t] = b;
 831                                 return;
 832                         }
 833                         if (o is ArrayList){
 834                                 ArrayList al = (ArrayList) o;
 835                                 for (int i = 0; i < al.Count; i++){
 836                                         if (al [i] == null){
 837                                                 al [i] = b;
 838                                                 return;
 839                                         }
 840                                 }
 841                                 al.Add (b);
 842                                 return;
 843                         }
 844                         ArrayList replacement = new ArrayList ();
 845                         replacement.Add (o);
 846                         temporary_storage.Remove (t);
 847                         temporary_storage [t] = replacement;
 848                 }
 849
 850                 /// <summary>
 851                 ///   Current loop begin and end labels.
 852                 /// </summary>
 853                 public Label LoopBegin, LoopEnd;
 854
 855                 /// <summary>
 856                 ///   Default target in a switch statement.   Only valid if
 857                 ///   InSwitch is true
 858                 /// </summary>
 859                 public Label DefaultTarget;
 860
 861                 /// <summary>
 862                 ///   If this is non-null, points to the current switch statement
 863                 /// </summary>
 864                 public Switch Switch;
 865
 866                 /// <summary>
 867                 ///   ReturnValue creates on demand the LocalBuilder for the
 868                 ///   return value from the function.  By default this is not
 869                 ///   used.  This is only required when returns are found inside
 870                 ///   Try or Catch statements.
 871                 ///
 872                 ///   This method is typically invoked from the Emit phase, so
 873                 ///   we allow the creation of a return label if it was not
 874                 ///   requested during the resolution phase.   Could be cleaned
 875                 ///   up, but it would replicate a lot of logic in the Emit phase
 876                 ///   of the code that uses it.
 877                 /// </summary>
 878                 public LocalBuilder TemporaryReturn ()
 879                 {
 880                         if (return_value == null){
 881                                 return_value = ig.DeclareLocal (ReturnType);
 882                                 if (!HasReturnLabel){
 883                                 ReturnLabel = ig.DefineLabel ();
 884                                 HasReturnLabel = true;
 885                         }
 886                         }
 887
 888                         return return_value;
 889                 }
 890
 891                 /// <summary>
 892                 ///   This method is used during the Resolution phase to flag the
 893                 ///   need to define the ReturnLabel
 894                 /// </summary>
 895                 public void NeedReturnLabel ()
 896                 {
 897                         if (current_phase != Phase.Resolving){
 898                                 //
 899                                 // The reason is that the `ReturnLabel' is declared between
 900                                 // resolution and emission
 901                                 //
 902                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 903                         }
 904
 905                         if (!InIterator && !HasReturnLabel)
 906                                 HasReturnLabel = true;
 907                 }
 908
 909                 //
 910                 // Emits the proper object to address fields on a remapped
 911                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 912                 //
 913                 public void EmitThis (bool need_address)
 914                 {
 915                         ig.Emit (OpCodes.Ldarg_0);
 916                         if (capture_context != null && CurrentAnonymousMethod != null){
 917                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 918                                 while (si != null){
 919                                         if (si.ParentLink != null)
 920                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 921                                         if (si.THIS != null){
 922                                                 if (need_address && TypeManager.IsValueType (si.THIS.FieldType))
 923                                                         ig.Emit (OpCodes.Ldflda, si.THIS);
 924                                                 else
 925                                                         ig.Emit (OpCodes.Ldfld, si.THIS);
 926                                                 break;
 927                                         }
 928                                         si = si.ParentScope;
 929                                 }
 930                         }
 931                 }
 932
 933                 //
 934                 // Emits the code necessary to load the instance required
 935                 // to access the captured LocalInfo
 936                 //
 937                 public void EmitCapturedVariableInstance (LocalInfo li)
 938                 {
 939                         if (capture_context == null)
 940                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
 941
 942                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
 943                 }
 944
 945                 public void EmitParameter (string name, bool leave_copy, bool prepared, ref LocalTemporary temp)
 946                 {
 947                         capture_context.EmitParameter (this, name, leave_copy, prepared, ref temp);
 948                 }
 949
 950                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load, ref LocalTemporary  temp)
 951                 {
 952                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load, ref temp);
 953                 }
 954
 955                 public void EmitAddressOfParameter (string name)
 956                 {
 957                         capture_context.EmitAddressOfParameter (this, name);
 958                 }
 959
 960                 public Expression GetThis (Location loc)
 961                 {
 962                         This my_this;
 963                         if (CurrentBlock != null)
 964                                 my_this = new This (CurrentBlock, loc);
 965                         else
 966                                 my_this = new This (loc);
 967
 968                         if (!my_this.ResolveBase (this))
 969                                 my_this = null;
 970
 971                         return my_this;
 972                 }
 973         }
 974
 975
 976         public abstract class CommonAssemblyModulClass : Attributable {
 977                 protected CommonAssemblyModulClass ():
 978                         base (null)
 979                 {
 980                 }
 981
 982                 public void AddAttributes (ArrayList attrs)
 983                 {
 984                         if (OptAttributes == null) {
 985                                 OptAttributes = new Attributes (attrs);
 986                                 return;
 987                         }
 988                         OptAttributes.AddAttributes (attrs);
 989                 }
 990
 991                 public virtual void Emit (TypeContainer tc)
 992                 {
 993                         if (OptAttributes == null)
 994                                 return;
 995
 996                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
 997                         OptAttributes.Emit (ec, this);
 998                 }
 999
1000                 protected Attribute ResolveAttribute (Type a_type)
1001                 {
1002                         if (OptAttributes == null)
1003                                 return null;
1004
1005                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1006                         if (!OptAttributes.CheckTargets (this))
1007                                 return null;
1008
1009                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1010                         Attribute a = OptAttributes.Search (a_type, temp_ec);
1011                         if (a != null) {
1012                                 a.Resolve (temp_ec);
1013                         }
1014                         return a;
1015                 }
1016         }
1017
1018         public class AssemblyClass : CommonAssemblyModulClass {
1019                 // TODO: make it private and move all builder based methods here
1020                 public AssemblyBuilder Builder;
1021                 public AssemblyName Name;
1022
1023                 bool is_cls_compliant;
1024                 bool wrap_non_exception_throws;
1025
1026                 public Attribute ClsCompliantAttribute;
1027
1028                 ListDictionary declarative_security;
1029
1030                 // Module is here just because of error messages
1031                 static string[] attribute_targets = new string [] { "assembly", "module" };
1032
1033                 public AssemblyClass (): base ()
1034                 {
1035                         wrap_non_exception_throws = true;
1036                 }
1037
1038                 public bool IsClsCompliant {
1039                         get {
1040                                 return is_cls_compliant;
1041                         }
1042                         }
1043
1044                 public bool WrapNonExceptionThrows {
1045                         get {
1046                                 return wrap_non_exception_throws;
1047                         }
1048                 }
1049
1050                 public override AttributeTargets AttributeTargets {
1051                         get {
1052                                 return AttributeTargets.Assembly;
1053                         }
1054                 }
1055
1056                 public override bool IsClsComplianceRequired(DeclSpace ds)
1057                 {
1058                         return is_cls_compliant;
1059                 }
1060
1061                 public void Resolve ()
1062                 {
1063                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1064                         if (ClsCompliantAttribute != null) {
1065                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1066                         }
1067
1068 #if NET_2_0
1069                         Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
1070                         if (a != null) {
1071                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1072                                 if (val != null)
1073                                         wrap_non_exception_throws = (bool)val;
1074                         }
1075 #endif
1076                 }
1077
1078                 // fix bug #56621
1079                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1080                 {
1081                         try {
1082                                 // check for possible ECMA key
1083                                 if (strongNameBlob.Length == 16) {
1084                                         // will be rejected if not "the" ECMA key
1085                                         an.SetPublicKey (strongNameBlob);
1086                                 }
1087                                 else {
1088                                         // take it, with or without, a private key
1089                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1090                                         // and make sure we only feed the public part to Sys.Ref
1091                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1092
1093                                         // AssemblyName.SetPublicKey requires an additional header
1094                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1095
1096                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1097                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1098                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1099                                         an.SetPublicKey (encodedPublicKey);
1100                                 }
1101                         }
1102                         catch (Exception) {
1103                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1104                                 Environment.Exit (1);
1105                         }
1106                 }
1107
1108                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1109                 public AssemblyName GetAssemblyName (string name, string output)
1110                 {
1111                         if (OptAttributes != null) {
1112                                foreach (Attribute a in OptAttributes.Attrs) {
1113                                        // cannot rely on any resolve-based members before you call Resolve
1114                                        if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1115                                                continue;
1116
1117                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1118                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1119                                         //       are loaded yet.
1120                                         // TODO: Does not handle quoted attributes properly
1121                                         switch (a.Name) {
1122                                                 case "AssemblyKeyFile":
1123                                                case "AssemblyKeyFileAttribute":
1124                                                case "System.Reflection.AssemblyKeyFileAttribute":
1125                                                         if (RootContext.StrongNameKeyFile != null) {
1126                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1127                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1128                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1129                                                         }
1130                                                         else {
1131                                                                 string value = a.GetString ();
1132                                                                 if (value != String.Empty)
1133                                                                         RootContext.StrongNameKeyFile = value;
1134                                                         }
1135                                                         break;
1136                                                 case "AssemblyKeyName":
1137                                                case "AssemblyKeyNameAttribute":
1138                                                case "System.Reflection.AssemblyKeyNameAttribute":
1139                                                         if (RootContext.StrongNameKeyContainer != null) {
1140                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1141                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1142                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1143                                                         }
1144                                                         else {
1145                                                                 string value = a.GetString ();
1146                                                                 if (value != String.Empty)
1147                                                                         RootContext.StrongNameKeyContainer = value;
1148                                                         }
1149                                                         break;
1150                                                 case "AssemblyDelaySign":
1151                                                case "AssemblyDelaySignAttribute":
1152                                                case "System.Reflection.AssemblyDelaySignAttribute":
1153                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1154                                                         break;
1155                                         }
1156                                 }
1157                         }
1158
1159                         AssemblyName an = new AssemblyName ();
1160                         an.Name = Path.GetFileNameWithoutExtension (name);
1161
1162                         // note: delay doesn't apply when using a key container
1163                         if (RootContext.StrongNameKeyContainer != null) {
1164                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1165                                 return an;
1166                         }
1167
1168                         // strongname is optional
1169                         if (RootContext.StrongNameKeyFile == null)
1170                                 return an;
1171
1172                         string AssemblyDir = Path.GetDirectoryName (output);
1173
1174                         // the StrongName key file may be relative to (a) the compiled
1175                         // file or (b) to the output assembly. See bugzilla #55320
1176                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1177
1178                         // (a) relative to the compiled file
1179                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1180                         bool exist = File.Exists (filename);
1181                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1182                                 // (b) relative to the outputed assembly
1183                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1184                                 exist = File.Exists (filename);
1185                         }
1186
1187                         if (exist) {
1188                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1189                                         byte[] snkeypair = new byte [fs.Length];
1190                                         fs.Read (snkeypair, 0, snkeypair.Length);
1191
1192                                         if (RootContext.StrongNameDelaySign) {
1193                                                 // delayed signing - DO NOT include private key
1194                                                 SetPublicKey (an, snkeypair);
1195                                         }
1196                                         else {
1197                                                 // no delay so we make sure we have the private key
1198                                                 try {
1199                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1200                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1201                                                 }
1202                                                 catch (CryptographicException) {
1203                                                         if (snkeypair.Length == 16) {
1204                                                                 // error # is different for ECMA key
1205                                                                 Report.Error (1606, "Could not sign the assembly. " +
1206                                                                         "ECMA key can only be used to delay-sign assemblies");
1207                                                         }
1208                                                         else {
1209                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1210                                                         }
1211                                                         return null;
1212                                                 }
1213                                         }
1214                                 }
1215                         }
1216                         else {
1217                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1218                                 return null;
1219                         }
1220                         return an;
1221                 }
1222
1223                 void Error_AssemblySigning (string text)
1224                 {
1225                         Report.Error (1548, "Error during assembly signing. " + text);
1226                 }
1227
1228                 bool CheckInternalsVisibleAttribute (Attribute a)
1229                 {
1230                         string assembly_name = a.GetString ();
1231                         if (assembly_name.Length == 0)
1232                                 return false;
1233
1234                         AssemblyName aname = null;
1235                         try {
1236                                 aname = new AssemblyName (assembly_name);
1237                         } catch (FileLoadException) {
1238                         } catch (ArgumentException) {
1239                         }
1240
1241                         // Bad assembly name format
1242                         if (aname == null)
1243                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1244                         // Report error if we have defined Version or Culture
1245                         else if (aname.Version != null || aname.CultureInfo != null)
1246                                 throw new Exception ("Friend assembly `" + a.GetString () +
1247                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1248                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null) {
1249                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1250                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1251                                 return false;
1252                         }
1253
1254                         return true;
1255                 }
1256
1257                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1258                 {
1259                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1260                                 if (declarative_security == null)
1261                                         declarative_security = new ListDictionary ();
1262
1263                                 a.ExtractSecurityPermissionSet (declarative_security);
1264                                 return;
1265                         }
1266
1267                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1268                                 string value = a.GetString ();
1269                                 if (value == null || value.Length == 0)
1270                                         return;
1271
1272                                 if (RootContext.Target == Target.Exe) {
1273                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1274                                         return;
1275                                 }
1276                         }
1277
1278                         if (a.Type == TypeManager.internals_visible_attr_type && !CheckInternalsVisibleAttribute (a))
1279                                         return;
1280
1281                         Builder.SetCustomAttribute (customBuilder);
1282                 }
1283
1284                 public override void Emit (TypeContainer tc)
1285                 {
1286                         base.Emit (tc);
1287
1288                         if (declarative_security != null) {
1289
1290                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1291                                 object builder_instance = Builder;
1292
1293                                 try {
1294                                         // Microsoft runtime hacking
1295                                         if (add_permission == null) {
1296                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1297                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1298
1299                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1300                                                 builder_instance = fi.GetValue (Builder);
1301                                         }
1302
1303                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1304                                                                                                   declarative_security [SecurityAction.RequestOptional],
1305                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1306                                         add_permission.Invoke (builder_instance, args);
1307                                 }
1308                                 catch {
1309                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1310                                 }
1311                         }
1312
1313                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1314                         if (OptAttributes == null || !OptAttributes.Contains (TypeManager.runtime_compatibility_attr_type, null)) {
1315                                 if (RootContext.StdLib) {
1316                                         ConstructorInfo ci = TypeManager.runtime_compatibility_attr_type.GetConstructor (TypeManager.NoTypes);
1317                                         PropertyInfo pi = TypeManager.runtime_compatibility_attr_type.GetProperty ("WrapNonExceptionThrows");
1318                                         Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0],
1319                                                 new PropertyInfo [] { pi }, new object[] { true } ));
1320                                 } else {
1321                                         // FIXME: Do something appropriate for 'mscorlib'
1322                                         Report.Warning (-31, 1, "FIXME: Did not emit 'RuntimeComatibilityAttribute' for mscorlib");
1323                                 }
1324                         }
1325                 }
1326
1327                 public override string[] ValidAttributeTargets {
1328                         get {
1329                                 return attribute_targets;
1330                         }
1331                 }
1332         }
1333
1334         public class ModuleClass : CommonAssemblyModulClass {
1335                 // TODO: make it private and move all builder based methods here
1336                 public ModuleBuilder Builder;
1337                 bool m_module_is_unsafe;
1338
1339                 public CharSet DefaultCharSet = CharSet.Ansi;
1340                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1341
1342                 static string[] attribute_targets = new string [] { "module" };
1343
1344                 public ModuleClass (bool is_unsafe)
1345                 {
1346                         m_module_is_unsafe = is_unsafe;
1347                 }
1348
1349                 public override AttributeTargets AttributeTargets {
1350                         get {
1351                                 return AttributeTargets.Module;
1352                         }
1353                 }
1354
1355                 public override bool IsClsComplianceRequired(DeclSpace ds)
1356                 {
1357                         return CodeGen.Assembly.IsClsCompliant;
1358                         }
1359
1360                 public override void Emit (TypeContainer tc)
1361                 {
1362                         base.Emit (tc);
1363
1364                         if (!m_module_is_unsafe)
1365                                 return;
1366
1367                         if (TypeManager.unverifiable_code_ctor == null) {
1368                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1369                                 return;
1370                         }
1371
1372                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1373                 }
1374
1375                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1376                 {
1377                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1378                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1379                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1380                                 }
1381                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1382                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1383                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1384                                         return;
1385                                 }
1386                         }
1387
1388                         Builder.SetCustomAttribute (customBuilder);
1389                 }
1390
1391                 /// <summary>
1392                 /// It is called very early therefore can resolve only predefined attributes
1393                 /// </summary>
1394                 public void ResolveAttributes ()
1395                 {
1396                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1397                         if (a != null) {
1398                                 DefaultCharSet = a.GetCharSetValue ();
1399                                 switch (DefaultCharSet) {
1400                                         case CharSet.Ansi:
1401                                         case CharSet.None:
1402                                                 break;
1403                                         case CharSet.Auto:
1404                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1405                                                 break;
1406                                         case CharSet.Unicode:
1407                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1408                                                 break;
1409                                         default:
1410                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1411                                                 break;
1412                                 }
1413                         }
1414                 }
1415
1416                 public override string[] ValidAttributeTargets {
1417                         get {
1418                                 return attribute_targets;
1419                         }
1420                 }
1421         }
1422 }