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