mcs/bmcs/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 //#define PRODUCTION
  11 using System;
  12 using System.IO;
  13 using System.Collections;
  14 using System.Collections.Specialized;
  15 using System.Reflection;
  16 using System.Reflection.Emit;
  17 using System.Runtime.InteropServices;
  18 using System.Security;
  19 using System.Security.Cryptography;
  20 using System.Security.Permissions;
  21
  22 using Mono.Security.Cryptography;
  23
  24 namespace Mono.CSharp {
  25
  26         /// <summary>
  27         ///    Code generator class.
  28         /// </summary>
  29         public class CodeGen {
  30                 static AppDomain current_domain;
  31                 static public SymbolWriter SymbolWriter;
  32
  33                 public static AssemblyClass Assembly;
  34                 public static ModuleClass Module;
  35
  36                 static CodeGen ()
  37                 {
  38                         Assembly = new AssemblyClass ();
  39                         Module = new ModuleClass (RootContext.Unsafe);
  40                 }
  41
  42                 public static string Basename (string name)
  43                 {
  44                         int pos = name.LastIndexOf ('/');
  45
  46                         if (pos != -1)
  47                                 return name.Substring (pos + 1);
  48
  49                         pos = name.LastIndexOf ('\\');
  50                         if (pos != -1)
  51                                 return name.Substring (pos + 1);
  52
  53                         return name;
  54                 }
  55
  56                 public static string Dirname (string name)
  57                 {
  58                         int pos = name.LastIndexOf ('/');
  59
  60                         if (pos != -1)
  61                                 return name.Substring (0, pos);
  62
  63                         pos = name.LastIndexOf ('\\');
  64                         if (pos != -1)
  65                                 return name.Substring (0, pos);
  66
  67                         return ".";
  68                 }
  69
  70                 static string TrimExt (string name)
  71                 {
  72                         int pos = name.LastIndexOf ('.');
  73
  74                         return name.Substring (0, pos);
  75                 }
  76
  77                 static public string FileName;
  78
  79                 //
  80                 // Initializes the symbol writer
  81                 //
  82                 static void InitializeSymbolWriter (string filename)
  83                 {
  84                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  85
  86                         //
  87                         // If we got an ISymbolWriter instance, initialize it.
  88                         //
  89                         if (SymbolWriter == null) {
  90                                 Report.Warning (
  91                                         -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.");
  92                                 return;
  93                         }
  94                 }
  95
  96                 //
  97                 // Initializes the code generator variables
  98                 //
  99                 static public void Init (string name, string output, bool want_debugging_support)
 100                 {
 101                         FileName = output;
 102                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 103
 104                         if (an.KeyPair != null) {
 105                                 // If we are going to strong name our assembly make
 106                                 // sure all its refs are strong named
 107                                 foreach (Assembly a in TypeManager.GetAssemblies ()) {
 108                                         AssemblyName ref_name = a.GetName ();
 109                                         byte [] b = ref_name.GetPublicKeyToken ();
 110                                         if (b == null || b.Length == 0) {
 111                                                 Report.Warning (1577, "Assembly generation failed " +
 112                                                                 "-- Referenced assembly '" +
 113                                                                 ref_name.Name +
 114                                                                 "' does not have a strong name.");
 115                                                 //Environment.Exit (1);
 116                                         }
 117                                 }
 118                         }
 119
 120                         current_domain = AppDomain.CurrentDomain;
 121
 122                         try {
 123                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 124                                         AssemblyBuilderAccess.Save, Dirname (name));
 125                         }
 126                         catch (ArgumentException) {
 127                                 // specified key may not be exportable outside it's container
 128                                 if (RootContext.StrongNameKeyContainer != null) {
 129                                         Report.Error (1548, "Could not access the key inside the container `" +
 130                                                 RootContext.StrongNameKeyContainer + "'.");
 131                                         Environment.Exit (1);
 132                                 }
 133                                 throw;
 134                         }
 135                         catch (CryptographicException) {
 136                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 137                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 138                                         Environment.Exit (1);
 139                                 }
 140                                 throw;
 141                         }
 142
 143                         //
 144                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 145                         // this copes with output in different directories then.
 146                         // FIXME: figure out how this copes with --output /tmp/blah
 147                         //
 148                         // If the third argument is true, the ModuleBuilder will dynamically
 149                         // load the default symbol writer.
 150                         //
 151                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 152                                 Basename (name), Basename (output), false);
 153
 154                         if (want_debugging_support)
 155                                 InitializeSymbolWriter (output);
 156                 }
 157
 158                 static public void Save (string name)
 159                 {
 160                         try {
 161                                 Assembly.Builder.Save (Basename (name));
 162                         }
 163                         catch (COMException) {
 164                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 165                                         throw;
 166
 167                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 168                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 169                                         RootContext.StrongNameKeyFile +
 170                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 171                         }
 172                         catch (System.IO.IOException io) {
 173                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 174                         }
 175
 176                         if (SymbolWriter != null)
 177                                 SymbolWriter.WriteSymbolFile ();
 178                 }
 179
 180                 public static void AddGlobalAttributes (ArrayList attrs)
 181                 {
 182                         foreach (Attribute attr in attrs) {
 183                                 if (attr.IsAssemblyAttribute)
 184                                         Assembly.AddAttribute (attr);
 185                                 else if (attr.IsModuleAttribute)
 186                                         Module.AddAttribute (attr);
 187                         }
 188                 }
 189         }
 190
 191         //
 192         // Provides "local" store across code that can yield: locals
 193         // or fields, notice that this should not be used by anonymous
 194         // methods to create local storage, those only require
 195         // variable mapping.
 196         //
 197         public class VariableStorage {
 198                 FieldBuilder fb;
 199                 LocalBuilder local;
 200
 201                 static int count;
 202
 203                 public VariableStorage (EmitContext ec, Type t)
 204                 {
 205                         count++;
 206                         if (ec.InIterator)
 207                                 fb = ec.CurrentIterator.MapVariable ("s_", count.ToString (), t);
 208                         else
 209                                 local = ec.ig.DeclareLocal (t);
 210                 }
 211
 212                 public void EmitThis (ILGenerator ig)
 213                 {
 214                         if (fb != null)
 215                                 ig.Emit (OpCodes.Ldarg_0);
 216                 }
 217
 218                 public void EmitStore (ILGenerator ig)
 219                 {
 220                         if (fb == null)
 221                                 ig.Emit (OpCodes.Stloc, local);
 222                         else
 223                                 ig.Emit (OpCodes.Stfld, fb);
 224                 }
 225
 226                 public void EmitLoad (ILGenerator ig)
 227                 {
 228                         if (fb == null)
 229                                 ig.Emit (OpCodes.Ldloc, local);
 230                         else
 231                                 ig.Emit (OpCodes.Ldfld, fb);
 232                 }
 233
 234                 public void EmitLoadAddress (ILGenerator ig)
 235                 {
 236                         if (fb == null)
 237                                 ig.Emit (OpCodes.Ldloca, local);
 238                         else
 239                                 ig.Emit (OpCodes.Ldflda, fb);
 240                 }
 241
 242                 public void EmitCall (ILGenerator ig, MethodInfo mi)
 243                 {
 244                         // FIXME : we should handle a call like tostring
 245                         // here, where boxing is needed. However, we will
 246                         // never encounter that with the current usage.
 247
 248                         bool value_type_call;
 249                         EmitThis (ig);
 250                         if (fb == null) {
 251                                 value_type_call = local.LocalType.IsValueType;
 252
 253                                 if (value_type_call)
 254                                         ig.Emit (OpCodes.Ldloca, local);
 255                                 else
 256                                         ig.Emit (OpCodes.Ldloc, local);
 257                         } else {
 258                                 value_type_call = fb.FieldType.IsValueType;
 259
 260                                 if (value_type_call)
 261                                         ig.Emit (OpCodes.Ldflda, fb);
 262                                 else
 263                                         ig.Emit (OpCodes.Ldfld, fb);
 264                         }
 265
 266                         ig.Emit (value_type_call ? OpCodes.Call : OpCodes.Callvirt, mi);
 267                 }
 268         }
 269
 270         /// <summary>
 271         ///   An Emit Context is created for each body of code (from methods,
 272         ///   properties bodies, indexer bodies or constructor bodies)
 273         /// </summary>
 274         public class EmitContext {
 275                 public DeclSpace DeclSpace;
 276                 public DeclSpace TypeContainer;
 277                 public ILGenerator   ig;
 278
 279                 /// <summary>
 280                 ///   This variable tracks the `checked' state of the compilation,
 281                 ///   it controls whether we should generate code that does overflow
 282                 ///   checking, or if we generate code that ignores overflows.
 283                 ///
 284                 ///   The default setting comes from the command line option to generate
 285                 ///   checked or unchecked code plus any source code changes using the
 286                 ///   checked/unchecked statements or expressions.   Contrast this with
 287                 ///   the ConstantCheckState flag.
 288                 /// </summary>
 289
 290                 public bool CheckState;
 291
 292                 /// <summary>
 293                 ///   The constant check state is always set to `true' and cant be changed
 294                 ///   from the command line.  The source code can change this setting with
 295                 ///   the `checked' and `unchecked' statements and expressions.
 296                 /// </summary>
 297                 public bool ConstantCheckState;
 298
 299                 /// <summary>
 300                 ///   Whether we are emitting code inside a static or instance method
 301                 /// </summary>
 302                 public bool IsStatic;
 303
 304                 /// <summary>
 305                 ///   Whether we are emitting a field initializer
 306                 /// </summary>
 307                 public bool IsFieldInitializer;
 308
 309                 /// <summary>
 310                 ///   The value that is allowed to be returned or NULL if there is no
 311                 ///   return type.
 312                 /// </summary>
 313                 public Type ReturnType;
 314
 315                 /// <summary>
 316                 ///   Points to the Type (extracted from the TypeContainer) that
 317                 ///   declares this body of code
 318                 /// </summary>
 319                 public Type ContainerType;
 320
 321                 /// <summary>
 322                 ///   Whether this is generating code for a constructor
 323                 /// </summary>
 324                 public bool IsConstructor;
 325
 326                 /// <summary>
 327                 ///   Whether we're control flow analysis enabled
 328                 /// </summary>
 329                 public bool DoFlowAnalysis;
 330
 331                 /// <summary>
 332                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 333                 ///   to store structures (used to compute the address of the structure
 334                 ///   value on structure method invocations)
 335                 /// </summary>
 336                 public Hashtable temporary_storage;
 337
 338                 public Block CurrentBlock;
 339
 340                 public int CurrentFile;
 341
 342                 /// <summary>
 343                 ///   The location where we store the return value.
 344                 /// </summary>
 345                 LocalBuilder return_value;
 346
 347                 /// <summary>
 348                 ///   The location where return has to jump to return the
 349                 ///   value
 350                 /// </summary>
 351                 public Label ReturnLabel;
 352
 353                 /// <summary>
 354                 ///   If we already defined the ReturnLabel
 355                 /// </summary>
 356                 public bool HasReturnLabel;
 357
 358                 /// <summary>
 359                 ///   Whether we are inside an iterator block.
 360                 /// </summary>
 361                 public bool InIterator;
 362
 363                 public bool IsLastStatement;
 364
 365                 /// <summary>
 366                 ///   Whether remapping of locals, parameters and fields is turned on.
 367                 ///   Used by iterators and anonymous methods.
 368                 /// </summary>
 369                 public bool RemapToProxy;
 370
 371                 /// <summary>
 372                 ///  Whether we are inside an unsafe block
 373                 /// </summary>
 374                 public bool InUnsafe;
 375
 376                 /// <summary>
 377                 ///  Whether we are in a `fixed' initialization
 378                 /// </summary>
 379                 public bool InFixedInitializer;
 380
 381                 /// <summary>
 382                 ///  Whether we are inside an anonymous method.
 383                 /// </summary>
 384                 public AnonymousMethod CurrentAnonymousMethod;
 385
 386                 /// <summary>
 387                 ///   Location for this EmitContext
 388                 /// </summary>
 389                 public Location loc;
 390
 391                 /// <summary>
 392                 ///   Used to flag that it is ok to define types recursively, as the
 393                 ///   expressions are being evaluated as part of the type lookup
 394                 ///   during the type resolution process
 395                 /// </summary>
 396                 public bool ResolvingTypeTree;
 397
 398                 /// <summary>
 399                 ///   Inside an enum definition, we do not resolve enumeration values
 400                 ///   to their enumerations, but rather to the underlying type/value
 401                 ///   This is so EnumVal + EnumValB can be evaluated.
 402                 ///
 403                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 404                 ///   we relax the rules
 405                 /// </summary>
 406                 public bool InEnumContext;
 407
 408                 /// <summary>
 409                 ///   Anonymous methods can capture local variables and fields,
 410                 ///   this object tracks it.  It is copied from the TopLevelBlock
 411                 ///   field.
 412                 /// </summary>
 413                 public CaptureContext capture_context;
 414
 415                 /// <summary>
 416                 /// Trace when method is called and is obsolete then this member suppress message
 417                 /// when call is inside next [Obsolete] method or type.
 418                 /// </summary>
 419                 public bool TestObsoleteMethodUsage = true;
 420
 421                 /// <summary>
 422                 ///    The current iterator
 423                 /// </summary>
 424                 public Iterator CurrentIterator;
 425
 426                 /// <summary>
 427                 ///    Whether we are in the resolving stage or not
 428                 /// </summary>
 429                 enum Phase {
 430                         Created,
 431                         Resolving,
 432                         Emitting
 433                 }
 434
 435                 Phase current_phase;
 436
 437                 FlowBranching current_flow_branching;
 438
 439                 public EmitContext (DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 440                                     Type return_type, int code_flags, bool is_constructor)
 441                 {
 442                         this.ig = ig;
 443
 444                         TypeContainer = parent;
 445                         DeclSpace = ds;
 446                         CheckState = RootContext.Checked;
 447                         ConstantCheckState = true;
 448
 449                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 450                                 throw new Exception ("FUCK");
 451
 452                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 453                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 454                         RemapToProxy = InIterator;
 455                         ReturnType = return_type;
 456                         IsConstructor = is_constructor;
 457                         CurrentBlock = null;
 458                         CurrentFile = 0;
 459                         current_phase = Phase.Created;
 460
 461                         if (parent != null){
 462                                 // Can only be null for the ResolveType contexts.
 463                                 ContainerType = parent.TypeBuilder;
 464                                 if (parent.UnsafeContext)
 465                                         InUnsafe = true;
 466                                 else
 467                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 468                         }
 469                         loc = l;
 470
 471                         if (ReturnType == TypeManager.void_type)
 472                                 ReturnType = null;
 473                 }
 474
 475                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 476                                     Type return_type, int code_flags, bool is_constructor)
 477                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 478                 {
 479                 }
 480
 481                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 482                                     Type return_type, int code_flags)
 483                         : this (tc, tc, l, ig, return_type, code_flags, false)
 484                 {
 485                 }
 486
 487                 public FlowBranching CurrentBranching {
 488                         get {
 489                                 return current_flow_branching;
 490                         }
 491                 }
 492
 493                 public bool HaveCaptureInfo {
 494                         get {
 495                                 return capture_context != null;
 496                         }
 497                 }
 498
 499                 // <summary>
 500                 //   Starts a new code branching.  This inherits the state of all local
 501                 //   variables and parameters from the current branching.
 502                 // </summary>
 503                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 504                 {
 505                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 506                         return current_flow_branching;
 507                 }
 508
 509                 // <summary>
 510                 //   Starts a new code branching for block `block'.
 511                 // </summary>
 512                 public FlowBranching StartFlowBranching (Block block)
 513                 {
 514                         FlowBranching.BranchingType type;
 515
 516                         if (CurrentBranching.Type == FlowBranching.BranchingType.Switch)
 517                                 type = FlowBranching.BranchingType.SwitchSection;
 518                         else
 519                                 type = FlowBranching.BranchingType.Block;
 520
 521                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, block, block.StartLocation);
 522                         return current_flow_branching;
 523                 }
 524
 525                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 526                 {
 527                         FlowBranchingException branching = new FlowBranchingException (
 528                                 CurrentBranching, stmt);
 529                         current_flow_branching = branching;
 530                         return branching;
 531                 }
 532
 533                 // <summary>
 534                 //   Ends a code branching.  Merges the state of locals and parameters
 535                 //   from all the children of the ending branching.
 536                 // </summary>
 537                 public FlowBranching.UsageVector DoEndFlowBranching ()
 538                 {
 539                         FlowBranching old = current_flow_branching;
 540                         current_flow_branching = current_flow_branching.Parent;
 541
 542                         return current_flow_branching.MergeChild (old);
 543                 }
 544
 545                 // <summary>
 546                 //   Ends a code branching.  Merges the state of locals and parameters
 547                 //   from all the children of the ending branching.
 548                 // </summary>
 549                 public FlowBranching.Reachability EndFlowBranching ()
 550                 {
 551                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 552
 553                         return vector.Reachability;
 554                 }
 555
 556                 // <summary>
 557                 //   Kills the current code branching.  This throws away any changed state
 558                 //   information and should only be used in case of an error.
 559                 // </summary>
 560                 public void KillFlowBranching ()
 561                 {
 562                         current_flow_branching = current_flow_branching.Parent;
 563                 }
 564
 565                 public void CaptureVariable (LocalInfo li)
 566                 {
 567                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 568                         li.IsCaptured = true;
 569                 }
 570
 571                 public void CaptureParameter (string name, Type t, int idx)
 572                 {
 573
 574                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 575                 }
 576
 577                 //
 578                 // Use to register a field as captured
 579                 //
 580                 public void CaptureField (FieldExpr fe)
 581                 {
 582                         capture_context.AddField (fe);
 583                 }
 584
 585                 //
 586                 // Whether anonymous methods have captured variables
 587                 //
 588                 public bool HaveCapturedVariables ()
 589                 {
 590                         if (capture_context != null)
 591                                 return capture_context.HaveCapturedVariables;
 592                         return false;
 593                 }
 594
 595                 //
 596                 // Whether anonymous methods have captured fields or this.
 597                 //
 598                 public bool HaveCapturedFields ()
 599                 {
 600                         if (capture_context != null)
 601                                 return capture_context.HaveCapturedFields;
 602                         return false;
 603                 }
 604
 605                 //
 606                 // Emits the instance pointer for the host method
 607                 //
 608                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 609                 {
 610                         if (capture_context != null)
 611                                 capture_context.EmitMethodHostInstance (target, am);
 612                         else if (IsStatic)
 613                                 target.ig.Emit (OpCodes.Ldnull);
 614                         else
 615                                 target.ig.Emit (OpCodes.Ldarg_0);
 616                 }
 617
 618                 //
 619                 // Returns whether the `local' variable has been captured by an anonymous
 620                 // method
 621                 //
 622                 public bool IsCaptured (LocalInfo local)
 623                 {
 624                         return capture_context.IsCaptured (local);
 625                 }
 626
 627                 public bool IsParameterCaptured (string name)
 628                 {
 629                         if (capture_context != null)
 630                                 return capture_context.IsParameterCaptured (name);
 631                         return false;
 632                 }
 633
 634                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 635                 {
 636                         if (capture_context != null)
 637                                 capture_context.EmitHelperClasses (this);
 638                         b.EmitMeta (this);
 639
 640                         if (HasReturnLabel)
 641                                 ReturnLabel = ig.DefineLabel ();
 642                 }
 643
 644                 //
 645                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 646                 // currently can not cope with ig == null during resolve (which must
 647                 // be fixed for switch statements to work on anonymous methods).
 648                 //
 649                 public void EmitTopBlock (ToplevelBlock block, InternalParameters ip, Location loc)
 650                 {
 651                         if (block == null)
 652                                 return;
 653
 654                         bool unreachable;
 655
 656                         if (ResolveTopBlock (null, block, ip, loc, out unreachable)){
 657                                 EmitMeta (block, ip);
 658
 659                                 current_phase = Phase.Emitting;
 660                                 EmitResolvedTopBlock (block, unreachable);
 661                         }
 662                 }
 663
 664                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 665                                              InternalParameters ip, Location loc, out bool unreachable)
 666                 {
 667                         current_phase = Phase.Resolving;
 668
 669                         unreachable = false;
 670
 671                         capture_context = block.CaptureContext;
 672
 673                         if (!Location.IsNull (loc))
 674                                 CurrentFile = loc.File;
 675
 676 #if PRODUCTION
 677                             try {
 678 #endif
 679                                 int errors = Report.Errors;
 680
 681                                 block.ResolveMeta (block, this, ip);
 682
 683
 684                                 if (Report.Errors == errors){
 685                                         bool old_do_flow_analysis = DoFlowAnalysis;
 686                                         DoFlowAnalysis = true;
 687
 688                                         if (anonymous_method_host != null)
 689                                                 current_flow_branching = FlowBranching.CreateBranching (
 690                                                 anonymous_method_host.CurrentBranching, FlowBranching.BranchingType.Block,
 691                                                 block, loc);
 692                                         else
 693                                         current_flow_branching = FlowBranching.CreateBranching (
 694                                                 null, FlowBranching.BranchingType.Block, block, loc);
 695
 696                                         if (!block.Resolve (this)) {
 697                                                 current_flow_branching = null;
 698                                                 DoFlowAnalysis = old_do_flow_analysis;
 699                                                 return false;
 700                                         }
 701
 702                                         FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 703                                         current_flow_branching = null;
 704
 705                                         DoFlowAnalysis = old_do_flow_analysis;
 706
 707                                         if (reachability.AlwaysReturns ||
 708                                             reachability.AlwaysThrows ||
 709                                             reachability.IsUnreachable)
 710                                                 unreachable = true;
 711                                         }
 712 #if PRODUCTION
 713                             } catch (Exception e) {
 714                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 715                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 716
 717                                         if (CurrentBlock != null){
 718                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 719                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 720                                         }
 721                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 722                                 throw;
 723                         }
 724 #endif
 725
 726                         if (ReturnType != null && !unreachable){
 727                                 if (!InIterator){
 728                                         if (CurrentAnonymousMethod != null){
 729                                                 Report.Error (1643, loc, "Not all code paths return a value in anonymous method of type `{0}'",
 730                                                               CurrentAnonymousMethod.Type);
 731                                         } else {
 732                                         Report.Error (161, loc, "Not all code paths return a value");
 733                                         }
 734
 735                                         return false;
 736                                 }
 737                         }
 738                         block.CompleteContexts ();
 739
 740                         return true;
 741                 }
 742
 743                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 744                 {
 745                         if (block != null)
 746                                 block.Emit (this);
 747
 748                         if (HasReturnLabel)
 749                                 ig.MarkLabel (ReturnLabel);
 750
 751                         if (return_value != null){
 752                                 ig.Emit (OpCodes.Ldloc, return_value);
 753                                 ig.Emit (OpCodes.Ret);
 754                         } else {
 755                                 //
 756                                 // If `HasReturnLabel' is set, then we already emitted a
 757                                 // jump to the end of the method, so we must emit a `ret'
 758                                 // there.
 759                                 //
 760                                 // Unfortunately, System.Reflection.Emit automatically emits
 761                                 // a leave to the end of a finally block.  This is a problem
 762                                 // if no code is following the try/finally block since we may
 763                                 // jump to a point after the end of the method.
 764                                 // As a workaround, we're always creating a return label in
 765                                 // this case.
 766                                 //
 767
 768                                 if ((block != null) && block.IsDestructor) {
 769                                         // Nothing to do; S.R.E automatically emits a leave.
 770                                 } else if (HasReturnLabel || (!unreachable && !InIterator)) {
 771                                         if (ReturnType != null)
 772                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 773                                         ig.Emit (OpCodes.Ret);
 774                                 }
 775                         }
 776
 777                         //
 778                         // Close pending helper classes if we are the toplevel
 779                         //
 780                         if (capture_context != null && capture_context.ParentToplevel == null)
 781                                 capture_context.CloseHelperClasses ();
 782                 }
 783
 784                 /// <summary>
 785                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 786                 ///   writer to which source line this opcode belongs.
 787                 /// </summary>
 788                 public void Mark (Location loc, bool check_file)
 789                 {
 790                         if ((CodeGen.SymbolWriter == null) || Location.IsNull (loc))
 791                                 return;
 792
 793                         if (check_file && (CurrentFile != loc.File))
 794                                 return;
 795
 796                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, 0);
 797                 }
 798
 799                 public void DefineLocalVariable (string name, LocalBuilder builder)
 800                 {
 801                         if (CodeGen.SymbolWriter == null)
 802                                 return;
 803
 804                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 805                 }
 806
 807                 /// <summary>
 808                 ///   Returns a temporary storage for a variable of type t as
 809                 ///   a local variable in the current body.
 810                 /// </summary>
 811                 public LocalBuilder GetTemporaryLocal (Type t)
 812                 {
 813                         LocalBuilder location = null;
 814
 815                         if (temporary_storage != null){
 816                                 object o = temporary_storage [t];
 817                                 if (o != null){
 818                                         if (o is ArrayList){
 819                                                 ArrayList al = (ArrayList) o;
 820
 821                                                 for (int i = 0; i < al.Count; i++){
 822                                                         if (al [i] != null){
 823                                                                 location = (LocalBuilder) al [i];
 824                                                                 al [i] = null;
 825                                                                 break;
 826                                                         }
 827                                                 }
 828                                         } else
 829                                                 location = (LocalBuilder) o;
 830                                         if (location != null)
 831                                                 return location;
 832                                 }
 833                         }
 834
 835                         return ig.DeclareLocal (t);
 836                 }
 837
 838                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 839                 {
 840                         if (temporary_storage == null){
 841                                 temporary_storage = new Hashtable ();
 842                                 temporary_storage [t] = b;
 843                                 return;
 844                         }
 845                         object o = temporary_storage [t];
 846                         if (o == null){
 847                                 temporary_storage [t] = b;
 848                                 return;
 849                         }
 850                         if (o is ArrayList){
 851                                 ArrayList al = (ArrayList) o;
 852                                 for (int i = 0; i < al.Count; i++){
 853                                         if (al [i] == null){
 854                                                 al [i] = b;
 855                                                 return;
 856                                         }
 857                                 }
 858                                 al.Add (b);
 859                                 return;
 860                         }
 861                         ArrayList replacement = new ArrayList ();
 862                         replacement.Add (o);
 863                         temporary_storage.Remove (t);
 864                         temporary_storage [t] = replacement;
 865                 }
 866
 867                 /// <summary>
 868                 ///   Current loop begin and end labels.
 869                 /// </summary>
 870                 public Label LoopBegin, LoopEnd;
 871
 872                 /// <summary>
 873                 ///   Default target in a switch statement.   Only valid if
 874                 ///   InSwitch is true
 875                 /// </summary>
 876                 public Label DefaultTarget;
 877
 878                 /// <summary>
 879                 ///   If this is non-null, points to the current switch statement
 880                 /// </summary>
 881                 public Switch Switch;
 882
 883                 /// <summary>
 884                 ///   ReturnValue creates on demand the LocalBuilder for the
 885                 ///   return value from the function.  By default this is not
 886                 ///   used.  This is only required when returns are found inside
 887                 ///   Try or Catch statements.
 888                 ///
 889                 ///   This method is typically invoked from the Emit phase, so
 890                 ///   we allow the creation of a return label if it was not
 891                 ///   requested during the resolution phase.   Could be cleaned
 892                 ///   up, but it would replicate a lot of logic in the Emit phase
 893                 ///   of the code that uses it.
 894                 /// </summary>
 895                 public LocalBuilder TemporaryReturn ()
 896                 {
 897                         if (return_value == null){
 898                                 return_value = ig.DeclareLocal (ReturnType);
 899                                 if (!HasReturnLabel){
 900                                 ReturnLabel = ig.DefineLabel ();
 901                                 HasReturnLabel = true;
 902                         }
 903                         }
 904
 905                         return return_value;
 906                 }
 907
 908                 /// <summary>
 909                 ///   This method is used during the Resolution phase to flag the
 910                 ///   need to define the ReturnLabel
 911                 /// </summary>
 912                 public void NeedReturnLabel ()
 913                 {
 914                         if (current_phase != Phase.Resolving){
 915                                 //
 916                                 // The reason is that the `ReturnLabel' is declared between
 917                                 // resolution and emission
 918                                 //
 919                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 920                         }
 921
 922                         if (!InIterator && !HasReturnLabel)
 923                                 HasReturnLabel = true;
 924                         }
 925
 926                 //
 927                 // Creates a field `name' with the type `t' on the proxy class
 928                 //
 929                 public FieldBuilder MapVariable (string name, Type t)
 930                 {
 931                         if (InIterator)
 932                                 return CurrentIterator.MapVariable ("v_", name, t);
 933
 934                         throw new Exception ("MapVariable for an unknown state");
 935                 }
 936
 937                 public Expression RemapParameter (int idx)
 938                 {
 939                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 940                         fe.InstanceExpression = new ProxyInstance ();
 941                         return fe.DoResolve (this);
 942                 }
 943
 944                 public Expression RemapParameterLValue (int idx, Expression right_side)
 945                 {
 946                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 947                         fe.InstanceExpression = new ProxyInstance ();
 948                         return fe.DoResolveLValue (this, right_side);
 949                 }
 950
 951                 //
 952                 // Emits the proper object to address fields on a remapped
 953                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 954                 //
 955                 public void EmitThis ()
 956                 {
 957                         ig.Emit (OpCodes.Ldarg_0);
 958                         if (InIterator){
 959                                 if (!IsStatic){
 960                                 FieldBuilder this_field = CurrentIterator.this_field.FieldBuilder;
 961                                 if (TypeManager.IsValueType (this_field.FieldType))
 962                                         ig.Emit (OpCodes.Ldflda, this_field);
 963                                 else
 964                                         ig.Emit (OpCodes.Ldfld, this_field);
 965                         }
 966                         } else if (capture_context != null && CurrentAnonymousMethod != null){
 967                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 968                                 while (si != null){
 969                                         if (si.ParentLink != null)
 970                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 971                                         if (si.THIS != null){
 972                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 973                                                 break;
 974                                         }
 975                                         si = si.ParentScope;
 976                                 }
 977                         }
 978                 }
 979
 980                 //
 981                 // Emits the code necessary to load the instance required
 982                 // to access the captured LocalInfo
 983                 //
 984                 public void EmitCapturedVariableInstance (LocalInfo li)
 985                 {
 986                         if (RemapToProxy){
 987                                 ig.Emit (OpCodes.Ldarg_0);
 988                                 return;
 989                         }
 990
 991                         if (capture_context == null)
 992                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
 993
 994                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
 995                 }
 996
 997                 public void EmitParameter (string name)
 998                 {
 999                         capture_context.EmitParameter (this, name);
1000                 }
1001
1002                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
1003                 {
1004                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
1005                 }
1006
1007                 public void EmitAddressOfParameter (string name)
1008                 {
1009                         capture_context.EmitAddressOfParameter (this, name);
1010                 }
1011
1012                 public Expression GetThis (Location loc)
1013                 {
1014                         This my_this;
1015                         if (CurrentBlock != null)
1016                                 my_this = new This (CurrentBlock, loc);
1017                         else
1018                                 my_this = new This (loc);
1019
1020                         if (!my_this.ResolveBase (this))
1021                                 my_this = null;
1022
1023                         return my_this;
1024                 }
1025         }
1026
1027
1028         public abstract class CommonAssemblyModulClass: Attributable {
1029                 protected CommonAssemblyModulClass ():
1030                         base (null)
1031                 {
1032                 }
1033
1034                 public void AddAttribute (Attribute attr)
1035                 {
1036                         if (OptAttributes == null) {
1037                                 OptAttributes = new Attributes (attr);
1038                                 return;
1039                         }
1040                         OptAttributes.AddAttribute (attr);
1041                 }
1042
1043                 public void AddAttributes (ArrayList attrs)
1044                 {
1045                         if (OptAttributes == null) {
1046                                 OptAttributes = new Attributes (attrs);
1047                                 return;
1048                         }
1049                         OptAttributes.AddAttributes (attrs);
1050                 }
1051
1052                 public virtual void Emit (TypeContainer tc)
1053                 {
1054                         if (OptAttributes == null)
1055                                 return;
1056
1057                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
1058                         OptAttributes.Emit (ec, this);
1059                 }
1060
1061                 protected Attribute GetClsCompliantAttribute ()
1062                 {
1063                         if (OptAttributes == null)
1064                                 return null;
1065
1066                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1067                         if (!OptAttributes.CheckTargets (this))
1068                                 return null;
1069
1070                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1071                         Attribute a = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, temp_ec);
1072                         if (a != null) {
1073                                 a.Resolve (temp_ec);
1074                         }
1075                         return a;
1076                 }
1077         }
1078
1079         public class AssemblyClass: CommonAssemblyModulClass {
1080                 // TODO: make it private and move all builder based methods here
1081                 public AssemblyBuilder Builder;
1082
1083                 bool is_cls_compliant;
1084                 public Attribute ClsCompliantAttribute;
1085
1086                 ListDictionary declarative_security;
1087
1088                 static string[] attribute_targets = new string [] { "assembly" };
1089
1090                 public AssemblyClass (): base ()
1091                 {
1092                         is_cls_compliant = false;
1093                 }
1094
1095                 public bool IsClsCompliant {
1096                         get {
1097                                 return is_cls_compliant;
1098                         }
1099                         }
1100
1101                 public override AttributeTargets AttributeTargets {
1102                         get {
1103                                 return AttributeTargets.Assembly;
1104                         }
1105                 }
1106
1107                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1108                 {
1109                         return is_cls_compliant;
1110                 }
1111
1112                 public void ResolveClsCompliance ()
1113                 {
1114                         ClsCompliantAttribute = GetClsCompliantAttribute ();
1115                         if (ClsCompliantAttribute == null)
1116                                 return;
1117
1118                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1119                 }
1120
1121                 // fix bug #56621
1122                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1123                 {
1124                         try {
1125                                 // check for possible ECMA key
1126                                 if (strongNameBlob.Length == 16) {
1127                                         // will be rejected if not "the" ECMA key
1128                                         an.SetPublicKey (strongNameBlob);
1129                                 }
1130                                 else {
1131                                         // take it, with or without, a private key
1132                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1133                                         // and make sure we only feed the public part to Sys.Ref
1134                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1135
1136                                         // AssemblyName.SetPublicKey requires an additional header
1137                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1138
1139                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1140                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1141                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1142                                         an.SetPublicKey (encodedPublicKey);
1143                                 }
1144                         }
1145                         catch (Exception) {
1146                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1147                                         RootContext.StrongNameKeyFile + "' incorrectly encoded.");
1148                                 Environment.Exit (1);
1149                         }
1150                 }
1151
1152                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1153                 public AssemblyName GetAssemblyName (string name, string output)
1154                 {
1155                         if (OptAttributes != null) {
1156                                foreach (Attribute a in OptAttributes.Attrs) {
1157                                        // cannot rely on any resolve-based members before you call Resolve
1158                                        if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1159                                                continue;
1160
1161                                        // TODO: This code is buggy: comparing Attribute name without resolving it is wrong.
1162                                        //       However, this is invoked by CodeGen.Init, at which time none of the namespaces
1163                                        //       are loaded yet.
1164                                         switch (a.Name) {
1165                                                 case "AssemblyKeyFile":
1166                                                case "AssemblyKeyFileAttribute":
1167                                                case "System.Reflection.AssemblyKeyFileAttribute":
1168                                                         if (RootContext.StrongNameKeyFile != null) {
1169                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1170                                                                 Report.Warning (1616, "Compiler option '{0}' overrides '{1}' given in source", "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1171                                                         }
1172                                                         else {
1173                                                                 string value = a.GetString ();
1174                                                                 if (value != String.Empty)
1175                                                                         RootContext.StrongNameKeyFile = value;
1176                                                         }
1177                                                         break;
1178                                                 case "AssemblyKeyName":
1179                                                case "AssemblyKeyNameAttribute":
1180                                                case "System.Reflection.AssemblyKeyNameAttribute":
1181                                                         if (RootContext.StrongNameKeyContainer != null) {
1182                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1183                                                                 Report.Warning (1616, "keycontainer", "Compiler option '{0}' overrides '{1}' given in source", "System.Reflection.AssemblyKeyNameAttribute");
1184                                                         }
1185                                                         else {
1186                                                                 string value = a.GetString ();
1187                                                                 if (value != String.Empty)
1188                                                                         RootContext.StrongNameKeyContainer = value;
1189                                                         }
1190                                                         break;
1191                                                 case "AssemblyDelaySign":
1192                                                case "AssemblyDelaySignAttribute":
1193                                                case "System.Reflection.AssemblyDelaySignAttribute":
1194                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1195                                                         break;
1196                                         }
1197                                 }
1198                         }
1199
1200                         AssemblyName an = new AssemblyName ();
1201                         an.Name = Path.GetFileNameWithoutExtension (name);
1202
1203                         // note: delay doesn't apply when using a key container
1204                         if (RootContext.StrongNameKeyContainer != null) {
1205                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1206                                 return an;
1207                         }
1208
1209                         // strongname is optional
1210                         if (RootContext.StrongNameKeyFile == null)
1211                                 return an;
1212
1213                         string AssemblyDir = Path.GetDirectoryName (output);
1214
1215                         // the StrongName key file may be relative to (a) the compiled
1216                         // file or (b) to the output assembly. See bugzilla #55320
1217                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1218
1219                         // (a) relative to the compiled file
1220                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1221                         bool exist = File.Exists (filename);
1222                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1223                                 // (b) relative to the outputed assembly
1224                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1225                                 exist = File.Exists (filename);
1226                         }
1227
1228                         if (exist) {
1229                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1230                                         byte[] snkeypair = new byte [fs.Length];
1231                                         fs.Read (snkeypair, 0, snkeypair.Length);
1232
1233                                         if (RootContext.StrongNameDelaySign) {
1234                                                 // delayed signing - DO NOT include private key
1235                                                 SetPublicKey (an, snkeypair);
1236                                         }
1237                                         else {
1238                                                 // no delay so we make sure we have the private key
1239                                                 try {
1240                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1241                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1242                                                 }
1243                                                 catch (CryptographicException) {
1244                                                         if (snkeypair.Length == 16) {
1245                                                                 // error # is different for ECMA key
1246                                                                 Report.Error (1606, "Could not strongname the assembly. " +
1247                                                                         "ECMA key can only be used to delay-sign assemblies");
1248                                                         }
1249                                                         else {
1250                                                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1251                                                                         RootContext.StrongNameKeyFile +
1252                                                                         "' doesn't have a private key.");
1253                                                         }
1254                                                         Environment.Exit (1);
1255                                                 }
1256                                         }
1257                                 }
1258                         }
1259                         else {
1260                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1261                                         RootContext.StrongNameKeyFile + "' not found.");
1262                                 Environment.Exit (1);
1263                         }
1264                         return an;
1265                 }
1266
1267                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1268                 {
1269                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1270                                 if (declarative_security == null)
1271                                         declarative_security = new ListDictionary ();
1272
1273                                 a.ExtractSecurityPermissionSet (declarative_security);
1274                                 return;
1275                         }
1276
1277                         Builder.SetCustomAttribute (customBuilder);
1278                 }
1279
1280                 public override void Emit (TypeContainer tc)
1281                 {
1282                         base.Emit (tc);
1283
1284                         if (declarative_security != null) {
1285
1286                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1287                                 object builder_instance = Builder;
1288
1289                                 try {
1290                                         // Microsoft runtime hacking
1291                                         if (add_permission == null) {
1292                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1293                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1294
1295                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1296                                                 builder_instance = fi.GetValue (Builder);
1297                                         }
1298
1299                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1300                                                                                                   declarative_security [SecurityAction.RequestOptional],
1301                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1302                                         add_permission.Invoke (builder_instance, args);
1303                                 }
1304                                 catch {
1305                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1306                                 }
1307                         }
1308                 }
1309
1310                 public override string[] ValidAttributeTargets {
1311                         get {
1312                                 return attribute_targets;
1313                         }
1314                 }
1315         }
1316
1317         public class ModuleClass: CommonAssemblyModulClass {
1318                 // TODO: make it private and move all builder based methods here
1319                 public ModuleBuilder Builder;
1320                 bool m_module_is_unsafe;
1321
1322                 static string[] attribute_targets = new string [] { "module" };
1323
1324                 public ModuleClass (bool is_unsafe)
1325                 {
1326                         m_module_is_unsafe = is_unsafe;
1327                 }
1328
1329                 public override AttributeTargets AttributeTargets {
1330                         get {
1331                                 return AttributeTargets.Module;
1332                         }
1333                 }
1334
1335                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1336                 {
1337                         return CodeGen.Assembly.IsClsCompliant;
1338                         }
1339
1340                 public override void Emit (TypeContainer tc)
1341                 {
1342                         base.Emit (tc);
1343
1344                         if (!m_module_is_unsafe)
1345                                 return;
1346
1347                         if (TypeManager.unverifiable_code_ctor == null) {
1348                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1349                                 return;
1350                         }
1351
1352                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1353                 }
1354
1355                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1356                 {
1357                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1358                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1359                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1360                                 }
1361                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1362                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.Name);
1363                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1364                                         return;
1365                                 }
1366                         }
1367
1368                         Builder.SetCustomAttribute (customBuilder);
1369                 }
1370
1371                 public override string[] ValidAttributeTargets {
1372                         get {
1373                                 return attribute_targets;
1374                         }
1375                 }
1376         }
1377 }