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                 ///   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                 FlowBranching current_flow_branching;
 437
 438                 public EmitContext (DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 439                                     Type return_type, int code_flags, bool is_constructor)
 440                 {
 441                         this.ig = ig;
 442
 443                         TypeContainer = parent;
 444                         DeclSpace = ds;
 445                         CheckState = RootContext.Checked;
 446                         ConstantCheckState = true;
 447
 448                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 449                                 throw new Exception ("FUCK");
 450
 451                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 452                         MethodIsStatic = IsStatic;
 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                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 574                 }
 575
 576                 public void CaptureThis ()
 577                 {
 578                         capture_context.CaptureThis ();
 579                 }
 580
 581
 582                 //
 583                 // Use to register a field as captured
 584                 //
 585                 public void CaptureField (FieldExpr fe)
 586                 {
 587                         capture_context.AddField (fe);
 588                 }
 589
 590                 //
 591                 // Whether anonymous methods have captured variables
 592                 //
 593                 public bool HaveCapturedVariables ()
 594                 {
 595                         if (capture_context != null)
 596                                 return capture_context.HaveCapturedVariables;
 597                         return false;
 598                 }
 599
 600                 //
 601                 // Whether anonymous methods have captured fields or this.
 602                 //
 603                 public bool HaveCapturedFields ()
 604                 {
 605                         if (capture_context != null)
 606                                 return capture_context.HaveCapturedFields;
 607                         return false;
 608                 }
 609
 610                 //
 611                 // Emits the instance pointer for the host method
 612                 //
 613                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 614                 {
 615                         if (capture_context != null)
 616                                 capture_context.EmitMethodHostInstance (target, am);
 617                         else if (IsStatic)
 618                                 target.ig.Emit (OpCodes.Ldnull);
 619                         else
 620                                 target.ig.Emit (OpCodes.Ldarg_0);
 621                 }
 622
 623                 //
 624                 // Returns whether the `local' variable has been captured by an anonymous
 625                 // method
 626                 //
 627                 public bool IsCaptured (LocalInfo local)
 628                 {
 629                         return capture_context.IsCaptured (local);
 630                 }
 631
 632                 public bool IsParameterCaptured (string name)
 633                 {
 634                         if (capture_context != null)
 635                                 return capture_context.IsParameterCaptured (name);
 636                         return false;
 637                 }
 638
 639                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 640                 {
 641                         if (capture_context != null)
 642                                 capture_context.EmitAnonymousHelperClasses (this);
 643                         b.EmitMeta (this);
 644
 645                         if (HasReturnLabel)
 646                                 ReturnLabel = ig.DefineLabel ();
 647                 }
 648
 649                 //
 650                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 651                 // currently can not cope with ig == null during resolve (which must
 652                 // be fixed for switch statements to work on anonymous methods).
 653                 //
 654                 public void EmitTopBlock (ToplevelBlock block, InternalParameters ip, Location loc)
 655                 {
 656                         if (block == null)
 657                                 return;
 658
 659                         bool unreachable;
 660
 661                         if (ResolveTopBlock (null, block, ip, loc, out unreachable)){
 662                                 EmitMeta (block, ip);
 663
 664                                 current_phase = Phase.Emitting;
 665                                 EmitResolvedTopBlock (block, unreachable);
 666                         }
 667                 }
 668
 669                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 670                                              InternalParameters ip, Location loc, out bool unreachable)
 671                 {
 672                         current_phase = Phase.Resolving;
 673
 674                         unreachable = false;
 675
 676                         capture_context = block.CaptureContext;
 677
 678                         if (!Location.IsNull (loc))
 679                                 CurrentFile = loc.File;
 680
 681 #if PRODUCTION
 682                             try {
 683 #endif
 684                                 int errors = Report.Errors;
 685
 686                                 block.ResolveMeta (block, this, ip);
 687
 688
 689                                 if (Report.Errors == errors){
 690                                         bool old_do_flow_analysis = DoFlowAnalysis;
 691                                         DoFlowAnalysis = true;
 692
 693                                         if (anonymous_method_host != null)
 694                                                 current_flow_branching = FlowBranching.CreateBranching (
 695                                                 anonymous_method_host.CurrentBranching, FlowBranching.BranchingType.Block,
 696                                                 block, loc);
 697                                         else
 698                                         current_flow_branching = FlowBranching.CreateBranching (
 699                                                 null, FlowBranching.BranchingType.Block, block, loc);
 700
 701                                         if (!block.Resolve (this)) {
 702                                                 current_flow_branching = null;
 703                                                 DoFlowAnalysis = old_do_flow_analysis;
 704                                                 return false;
 705                                         }
 706
 707                                         FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 708                                         current_flow_branching = null;
 709
 710                                         DoFlowAnalysis = old_do_flow_analysis;
 711
 712                                         if (reachability.AlwaysReturns ||
 713                                             reachability.AlwaysThrows ||
 714                                             reachability.IsUnreachable)
 715                                                 unreachable = true;
 716                                         }
 717 #if PRODUCTION
 718                             } catch (Exception e) {
 719                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 720                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 721
 722                                         if (CurrentBlock != null){
 723                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 724                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 725                                         }
 726                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 727                                 throw;
 728                         }
 729 #endif
 730
 731                         if (ReturnType != null && !unreachable){
 732                                 if (!InIterator){
 733                                         if (CurrentAnonymousMethod != null){
 734                                                 Report.Error (1643, loc, "Not all code paths return a value in anonymous method of type `{0}'",
 735                                                               CurrentAnonymousMethod.Type);
 736                                         } else {
 737                                         Report.Error (161, loc, "Not all code paths return a value");
 738                                         }
 739
 740                                         return false;
 741                                 }
 742                         }
 743                         block.CompleteContexts ();
 744
 745                         return true;
 746                 }
 747
 748                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 749                 {
 750                         if (block != null)
 751                                 block.Emit (this);
 752
 753                         if (HasReturnLabel)
 754                                 ig.MarkLabel (ReturnLabel);
 755
 756                         if (return_value != null){
 757                                 ig.Emit (OpCodes.Ldloc, return_value);
 758                                 ig.Emit (OpCodes.Ret);
 759                         } else {
 760                                 //
 761                                 // If `HasReturnLabel' is set, then we already emitted a
 762                                 // jump to the end of the method, so we must emit a `ret'
 763                                 // there.
 764                                 //
 765                                 // Unfortunately, System.Reflection.Emit automatically emits
 766                                 // a leave to the end of a finally block.  This is a problem
 767                                 // if no code is following the try/finally block since we may
 768                                 // jump to a point after the end of the method.
 769                                 // As a workaround, we're always creating a return label in
 770                                 // this case.
 771                                 //
 772
 773                                 if ((block != null) && block.IsDestructor) {
 774                                         // Nothing to do; S.R.E automatically emits a leave.
 775                                 } else if (HasReturnLabel || (!unreachable && !InIterator)) {
 776                                         if (ReturnType != null)
 777                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 778                                         ig.Emit (OpCodes.Ret);
 779                                 }
 780                         }
 781
 782                         //
 783                         // Close pending helper classes if we are the toplevel
 784                         //
 785                         if (capture_context != null && capture_context.ParentToplevel == null)
 786                                 capture_context.CloseAnonymousHelperClasses ();
 787                 }
 788
 789                 /// <summary>
 790                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 791                 ///   writer to which source line this opcode belongs.
 792                 /// </summary>
 793                 public void Mark (Location loc, bool check_file)
 794                 {
 795                         if ((CodeGen.SymbolWriter == null) || Location.IsNull (loc))
 796                                 return;
 797
 798                         if (check_file && (CurrentFile != loc.File))
 799                                 return;
 800
 801                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, 0);
 802                 }
 803
 804                 public void DefineLocalVariable (string name, LocalBuilder builder)
 805                 {
 806                         if (CodeGen.SymbolWriter == null)
 807                                 return;
 808
 809                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 810                 }
 811
 812                 /// <summary>
 813                 ///   Returns a temporary storage for a variable of type t as
 814                 ///   a local variable in the current body.
 815                 /// </summary>
 816                 public LocalBuilder GetTemporaryLocal (Type t)
 817                 {
 818                         LocalBuilder location = null;
 819
 820                         if (temporary_storage != null){
 821                                 object o = temporary_storage [t];
 822                                 if (o != null){
 823                                         if (o is ArrayList){
 824                                                 ArrayList al = (ArrayList) o;
 825
 826                                                 for (int i = 0; i < al.Count; i++){
 827                                                         if (al [i] != null){
 828                                                                 location = (LocalBuilder) al [i];
 829                                                                 al [i] = null;
 830                                                                 break;
 831                                                         }
 832                                                 }
 833                                         } else
 834                                                 location = (LocalBuilder) o;
 835                                         if (location != null)
 836                                                 return location;
 837                                 }
 838                         }
 839
 840                         return ig.DeclareLocal (t);
 841                 }
 842
 843                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 844                 {
 845                         if (temporary_storage == null){
 846                                 temporary_storage = new Hashtable ();
 847                                 temporary_storage [t] = b;
 848                                 return;
 849                         }
 850                         object o = temporary_storage [t];
 851                         if (o == null){
 852                                 temporary_storage [t] = b;
 853                                 return;
 854                         }
 855                         if (o is ArrayList){
 856                                 ArrayList al = (ArrayList) o;
 857                                 for (int i = 0; i < al.Count; i++){
 858                                         if (al [i] == null){
 859                                                 al [i] = b;
 860                                                 return;
 861                                         }
 862                                 }
 863                                 al.Add (b);
 864                                 return;
 865                         }
 866                         ArrayList replacement = new ArrayList ();
 867                         replacement.Add (o);
 868                         temporary_storage.Remove (t);
 869                         temporary_storage [t] = replacement;
 870                 }
 871
 872                 /// <summary>
 873                 ///   Current loop begin and end labels.
 874                 /// </summary>
 875                 public Label LoopBegin, LoopEnd;
 876
 877                 /// <summary>
 878                 ///   Default target in a switch statement.   Only valid if
 879                 ///   InSwitch is true
 880                 /// </summary>
 881                 public Label DefaultTarget;
 882
 883                 /// <summary>
 884                 ///   If this is non-null, points to the current switch statement
 885                 /// </summary>
 886                 public Switch Switch;
 887
 888                 /// <summary>
 889                 ///   ReturnValue creates on demand the LocalBuilder for the
 890                 ///   return value from the function.  By default this is not
 891                 ///   used.  This is only required when returns are found inside
 892                 ///   Try or Catch statements.
 893                 ///
 894                 ///   This method is typically invoked from the Emit phase, so
 895                 ///   we allow the creation of a return label if it was not
 896                 ///   requested during the resolution phase.   Could be cleaned
 897                 ///   up, but it would replicate a lot of logic in the Emit phase
 898                 ///   of the code that uses it.
 899                 /// </summary>
 900                 public LocalBuilder TemporaryReturn ()
 901                 {
 902                         if (return_value == null){
 903                                 return_value = ig.DeclareLocal (ReturnType);
 904                                 if (!HasReturnLabel){
 905                                 ReturnLabel = ig.DefineLabel ();
 906                                 HasReturnLabel = true;
 907                         }
 908                         }
 909
 910                         return return_value;
 911                 }
 912
 913                 /// <summary>
 914                 ///   This method is used during the Resolution phase to flag the
 915                 ///   need to define the ReturnLabel
 916                 /// </summary>
 917                 public void NeedReturnLabel ()
 918                 {
 919                         if (current_phase != Phase.Resolving){
 920                                 //
 921                                 // The reason is that the `ReturnLabel' is declared between
 922                                 // resolution and emission
 923                                 //
 924                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 925                         }
 926
 927                         if (!InIterator && !HasReturnLabel)
 928                                 HasReturnLabel = true;
 929                         }
 930
 931                 //
 932                 // Creates a field `name' with the type `t' on the proxy class
 933                 //
 934                 public FieldBuilder MapVariable (string name, Type t)
 935                 {
 936                         if (InIterator)
 937                                 return CurrentIterator.MapVariable ("v_", name, t);
 938
 939                         throw new Exception ("MapVariable for an unknown state");
 940                 }
 941
 942                 public Expression RemapParameter (int idx)
 943                 {
 944                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 945                         fe.InstanceExpression = new ProxyInstance ();
 946                         return fe.DoResolve (this);
 947                 }
 948
 949                 public Expression RemapParameterLValue (int idx, Expression right_side)
 950                 {
 951                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 952                         fe.InstanceExpression = new ProxyInstance ();
 953                         return fe.DoResolveLValue (this, right_side);
 954                 }
 955
 956                 //
 957                 // Emits the proper object to address fields on a remapped
 958                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 959                 //
 960                 public void EmitThis ()
 961                 {
 962                         ig.Emit (OpCodes.Ldarg_0);
 963                         if (InIterator){
 964                                 if (!IsStatic){
 965                                 FieldBuilder this_field = CurrentIterator.this_field.FieldBuilder;
 966                                 if (TypeManager.IsValueType (this_field.FieldType))
 967                                         ig.Emit (OpCodes.Ldflda, this_field);
 968                                 else
 969                                         ig.Emit (OpCodes.Ldfld, this_field);
 970                         }
 971                         } else if (capture_context != null && CurrentAnonymousMethod != null){
 972                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 973                                 while (si != null){
 974                                         if (si.ParentLink != null)
 975                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 976                                         if (si.THIS != null){
 977                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 978                                                 break;
 979                                         }
 980                                         si = si.ParentScope;
 981                                 }
 982                         }
 983                 }
 984
 985                 //
 986                 // Emits the code necessary to load the instance required
 987                 // to access the captured LocalInfo
 988                 //
 989                 public void EmitCapturedVariableInstance (LocalInfo li)
 990                 {
 991                         if (RemapToProxy){
 992                                 ig.Emit (OpCodes.Ldarg_0);
 993                                 return;
 994                         }
 995
 996                         if (capture_context == null)
 997                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
 998
 999                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1000                 }
1001
1002                 public void EmitParameter (string name)
1003                 {
1004                         capture_context.EmitParameter (this, name);
1005                 }
1006
1007                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
1008                 {
1009                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
1010                 }
1011
1012                 public void EmitAddressOfParameter (string name)
1013                 {
1014                         capture_context.EmitAddressOfParameter (this, name);
1015                 }
1016
1017                 public Expression GetThis (Location loc)
1018                 {
1019                         This my_this;
1020                         if (CurrentBlock != null)
1021                                 my_this = new This (CurrentBlock, loc);
1022                         else
1023                                 my_this = new This (loc);
1024
1025                         if (!my_this.ResolveBase (this))
1026                                 my_this = null;
1027
1028                         return my_this;
1029                 }
1030         }
1031
1032
1033         public abstract class CommonAssemblyModulClass: Attributable {
1034                 protected CommonAssemblyModulClass ():
1035                         base (null)
1036                 {
1037                 }
1038
1039                 public void AddAttributes (ArrayList attrs)
1040                 {
1041                         if (OptAttributes == null) {
1042                                 OptAttributes = new Attributes (attrs);
1043                                 return;
1044                         }
1045                         OptAttributes.AddAttributes (attrs);
1046                 }
1047
1048                 public virtual void Emit (TypeContainer tc)
1049                 {
1050                         if (OptAttributes == null)
1051                                 return;
1052
1053                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
1054                         OptAttributes.Emit (ec, this);
1055                 }
1056
1057                 protected Attribute GetClsCompliantAttribute ()
1058                 {
1059                         if (OptAttributes == null)
1060                                 return null;
1061
1062                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1063                         if (!OptAttributes.CheckTargets (this))
1064                                 return null;
1065
1066                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1067                         Attribute a = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, temp_ec);
1068                         if (a != null) {
1069                                 a.Resolve (temp_ec);
1070                         }
1071                         return a;
1072                 }
1073         }
1074
1075         public class AssemblyClass: CommonAssemblyModulClass {
1076                 // TODO: make it private and move all builder based methods here
1077                 public AssemblyBuilder Builder;
1078
1079                 bool is_cls_compliant;
1080                 public Attribute ClsCompliantAttribute;
1081
1082                 ListDictionary declarative_security;
1083
1084                 static string[] attribute_targets = new string [] { "assembly" };
1085
1086                 public AssemblyClass (): base ()
1087                 {
1088                         is_cls_compliant = false;
1089                 }
1090
1091                 public bool IsClsCompliant {
1092                         get {
1093                                 return is_cls_compliant;
1094                         }
1095                         }
1096
1097                 public override AttributeTargets AttributeTargets {
1098                         get {
1099                                 return AttributeTargets.Assembly;
1100                         }
1101                 }
1102
1103                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1104                 {
1105                         return is_cls_compliant;
1106                 }
1107
1108                 public void ResolveClsCompliance ()
1109                 {
1110                         ClsCompliantAttribute = GetClsCompliantAttribute ();
1111                         if (ClsCompliantAttribute == null)
1112                                 return;
1113
1114                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1115                 }
1116
1117                 // fix bug #56621
1118                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1119                 {
1120                         try {
1121                                 // check for possible ECMA key
1122                                 if (strongNameBlob.Length == 16) {
1123                                         // will be rejected if not "the" ECMA key
1124                                         an.SetPublicKey (strongNameBlob);
1125                                 }
1126                                 else {
1127                                         // take it, with or without, a private key
1128                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1129                                         // and make sure we only feed the public part to Sys.Ref
1130                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1131
1132                                         // AssemblyName.SetPublicKey requires an additional header
1133                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1134
1135                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1136                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1137                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1138                                         an.SetPublicKey (encodedPublicKey);
1139                                 }
1140                         }
1141                         catch (Exception) {
1142                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1143                                         RootContext.StrongNameKeyFile + "' incorrectly encoded.");
1144                                 Environment.Exit (1);
1145                         }
1146                 }
1147
1148                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1149                 public AssemblyName GetAssemblyName (string name, string output)
1150                 {
1151                         if (OptAttributes != null) {
1152                                foreach (Attribute a in OptAttributes.Attrs) {
1153                                        // cannot rely on any resolve-based members before you call Resolve
1154                                        if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1155                                                continue;
1156
1157                                        // TODO: This code is buggy: comparing Attribute name without resolving it is wrong.
1158                                        //       However, this is invoked by CodeGen.Init, at which time none of the namespaces
1159                                        //       are loaded yet.
1160                                         switch (a.Name) {
1161                                                 case "AssemblyKeyFile":
1162                                                case "AssemblyKeyFileAttribute":
1163                                                case "System.Reflection.AssemblyKeyFileAttribute":
1164                                                         if (RootContext.StrongNameKeyFile != null) {
1165                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1166                                                                 Report.Warning (1616, "Compiler option '{0}' overrides '{1}' given in source", "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1167                                                         }
1168                                                         else {
1169                                                                 string value = a.GetString ();
1170                                                                 if (value != String.Empty)
1171                                                                         RootContext.StrongNameKeyFile = value;
1172                                                         }
1173                                                         break;
1174                                                 case "AssemblyKeyName":
1175                                                case "AssemblyKeyNameAttribute":
1176                                                case "System.Reflection.AssemblyKeyNameAttribute":
1177                                                         if (RootContext.StrongNameKeyContainer != null) {
1178                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1179                                                                 Report.Warning (1616, "keycontainer", "Compiler option '{0}' overrides '{1}' given in source", "System.Reflection.AssemblyKeyNameAttribute");
1180                                                         }
1181                                                         else {
1182                                                                 string value = a.GetString ();
1183                                                                 if (value != String.Empty)
1184                                                                         RootContext.StrongNameKeyContainer = value;
1185                                                         }
1186                                                         break;
1187                                                 case "AssemblyDelaySign":
1188                                                case "AssemblyDelaySignAttribute":
1189                                                case "System.Reflection.AssemblyDelaySignAttribute":
1190                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1191                                                         break;
1192                                         }
1193                                 }
1194                         }
1195
1196                         AssemblyName an = new AssemblyName ();
1197                         an.Name = Path.GetFileNameWithoutExtension (name);
1198
1199                         // note: delay doesn't apply when using a key container
1200                         if (RootContext.StrongNameKeyContainer != null) {
1201                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1202                                 return an;
1203                         }
1204
1205                         // strongname is optional
1206                         if (RootContext.StrongNameKeyFile == null)
1207                                 return an;
1208
1209                         string AssemblyDir = Path.GetDirectoryName (output);
1210
1211                         // the StrongName key file may be relative to (a) the compiled
1212                         // file or (b) to the output assembly. See bugzilla #55320
1213                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1214
1215                         // (a) relative to the compiled file
1216                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1217                         bool exist = File.Exists (filename);
1218                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1219                                 // (b) relative to the outputed assembly
1220                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1221                                 exist = File.Exists (filename);
1222                         }
1223
1224                         if (exist) {
1225                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1226                                         byte[] snkeypair = new byte [fs.Length];
1227                                         fs.Read (snkeypair, 0, snkeypair.Length);
1228
1229                                         if (RootContext.StrongNameDelaySign) {
1230                                                 // delayed signing - DO NOT include private key
1231                                                 SetPublicKey (an, snkeypair);
1232                                         }
1233                                         else {
1234                                                 // no delay so we make sure we have the private key
1235                                                 try {
1236                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1237                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1238                                                 }
1239                                                 catch (CryptographicException) {
1240                                                         if (snkeypair.Length == 16) {
1241                                                                 // error # is different for ECMA key
1242                                                                 Report.Error (1606, "Could not strongname the assembly. " +
1243                                                                         "ECMA key can only be used to delay-sign assemblies");
1244                                                         }
1245                                                         else {
1246                                                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1247                                                                         RootContext.StrongNameKeyFile +
1248                                                                         "' doesn't have a private key.");
1249                                                         }
1250                                                         Environment.Exit (1);
1251                                                 }
1252                                         }
1253                                 }
1254                         }
1255                         else {
1256                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1257                                         RootContext.StrongNameKeyFile + "' not found.");
1258                                 Environment.Exit (1);
1259                         }
1260                         return an;
1261                 }
1262
1263                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1264                 {
1265                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1266                                 if (declarative_security == null)
1267                                         declarative_security = new ListDictionary ();
1268
1269                                 a.ExtractSecurityPermissionSet (declarative_security);
1270                                 return;
1271                         }
1272
1273                         Builder.SetCustomAttribute (customBuilder);
1274                 }
1275
1276                 public override void Emit (TypeContainer tc)
1277                 {
1278                         base.Emit (tc);
1279
1280                         if (declarative_security != null) {
1281
1282                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1283                                 object builder_instance = Builder;
1284
1285                                 try {
1286                                         // Microsoft runtime hacking
1287                                         if (add_permission == null) {
1288                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1289                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1290
1291                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1292                                                 builder_instance = fi.GetValue (Builder);
1293                                         }
1294
1295                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1296                                                                                                   declarative_security [SecurityAction.RequestOptional],
1297                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1298                                         add_permission.Invoke (builder_instance, args);
1299                                 }
1300                                 catch {
1301                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1302                                 }
1303                         }
1304                 }
1305
1306                 public override string[] ValidAttributeTargets {
1307                         get {
1308                                 return attribute_targets;
1309                         }
1310                 }
1311         }
1312
1313         public class ModuleClass: CommonAssemblyModulClass {
1314                 // TODO: make it private and move all builder based methods here
1315                 public ModuleBuilder Builder;
1316                 bool m_module_is_unsafe;
1317
1318                 static string[] attribute_targets = new string [] { "module" };
1319
1320                 public ModuleClass (bool is_unsafe)
1321                 {
1322                         m_module_is_unsafe = is_unsafe;
1323                 }
1324
1325                 public override AttributeTargets AttributeTargets {
1326                         get {
1327                                 return AttributeTargets.Module;
1328                         }
1329                 }
1330
1331                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1332                 {
1333                         return CodeGen.Assembly.IsClsCompliant;
1334                         }
1335
1336                 public override void Emit (TypeContainer tc)
1337                 {
1338                         base.Emit (tc);
1339
1340                         if (!m_module_is_unsafe)
1341                                 return;
1342
1343                         if (TypeManager.unverifiable_code_ctor == null) {
1344                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1345                                 return;
1346                         }
1347
1348                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1349                 }
1350
1351                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1352                 {
1353                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1354                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1355                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1356                                 }
1357                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1358                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.Name);
1359                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1360                                         return;
1361                                 }
1362                         }
1363
1364                         Builder.SetCustomAttribute (customBuilder);
1365                 }
1366
1367                 public override string[] ValidAttributeTargets {
1368                         get {
1369                                 return attribute_targets;
1370                         }
1371                 }
1372         }
1373 }