mcs/mcs/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                         Reset ();
  39                 }
  40
  41                 public static void Reset ()
  42                 {
  43                         Assembly = new AssemblyClass ();
  44                         Module = new ModuleClass (RootContext.Unsafe);
  45                 }
  46
  47                 public static string Basename (string name)
  48                 {
  49                         int pos = name.LastIndexOf ('/');
  50
  51                         if (pos != -1)
  52                                 return name.Substring (pos + 1);
  53
  54                         pos = name.LastIndexOf ('\\');
  55                         if (pos != -1)
  56                                 return name.Substring (pos + 1);
  57
  58                         return name;
  59                 }
  60
  61                 public static string Dirname (string name)
  62                 {
  63                         int pos = name.LastIndexOf ('/');
  64
  65                         if (pos != -1)
  66                                 return name.Substring (0, pos);
  67
  68                         pos = name.LastIndexOf ('\\');
  69                         if (pos != -1)
  70                                 return name.Substring (0, pos);
  71
  72                         return ".";
  73                 }
  74
  75                 static string TrimExt (string name)
  76                 {
  77                         int pos = name.LastIndexOf ('.');
  78
  79                         return name.Substring (0, pos);
  80                 }
  81
  82                 static public string FileName;
  83
  84                 //
  85                 // Initializes the symbol writer
  86                 //
  87                 static void InitializeSymbolWriter (string filename)
  88                 {
  89                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  90
  91                         //
  92                         // If we got an ISymbolWriter instance, initialize it.
  93                         //
  94                         if (SymbolWriter == null) {
  95                                 Report.Warning (
  96                                         -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.");
  97                                 return;
  98                         }
  99                 }
 100
 101                 //
 102                 // Initializes the code generator variables
 103                 //
 104                 static public bool Init (string name, string output, bool want_debugging_support)
 105                 {
 106                         FileName = output;
 107                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 108                         if (an == null)
 109                                 return false;
 110
 111                         if (an.KeyPair != null) {
 112                                 // If we are going to strong name our assembly make
 113                                 // sure all its refs are strong named
 114                                 foreach (Assembly a in TypeManager.GetAssemblies ()) {
 115                                         AssemblyName ref_name = a.GetName ();
 116                                         byte [] b = ref_name.GetPublicKeyToken ();
 117                                         if (b == null || b.Length == 0) {
 118                                                 Report.Warning (1577, "Assembly generation failed " +
 119                                                                 "-- Referenced assembly '" +
 120                                                                 ref_name.Name +
 121                                                                 "' does not have a strong name.");
 122                                                 //Environment.Exit (1);
 123                                         }
 124                                 }
 125                         }
 126
 127                         current_domain = AppDomain.CurrentDomain;
 128
 129                         try {
 130                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 131                                         AssemblyBuilderAccess.Save, Dirname (name));
 132                         }
 133                         catch (ArgumentException) {
 134                                 // specified key may not be exportable outside it's container
 135                                 if (RootContext.StrongNameKeyContainer != null) {
 136                                         Report.Error (1548, "Could not access the key inside the container `" +
 137                                                 RootContext.StrongNameKeyContainer + "'.");
 138                                         Environment.Exit (1);
 139                                 }
 140                                 return false;
 141                         }
 142                         catch (CryptographicException) {
 143                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 144                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 145                                         Environment.Exit (1);
 146                                 }
 147                                 return false;
 148                         }
 149
 150                         //
 151                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 152                         // this copes with output in different directories then.
 153                         // FIXME: figure out how this copes with --output /tmp/blah
 154                         //
 155                         // If the third argument is true, the ModuleBuilder will dynamically
 156                         // load the default symbol writer.
 157                         //
 158                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 159                                 Basename (name), Basename (output), false);
 160
 161                         if (want_debugging_support)
 162                                 InitializeSymbolWriter (output);
 163
 164                         return true;
 165                 }
 166
 167                 static public void Save (string name)
 168                 {
 169                         try {
 170                                 Assembly.Builder.Save (Basename (name));
 171                         }
 172                         catch (COMException) {
 173                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 174                                         throw;
 175
 176                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 177                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 178                                         RootContext.StrongNameKeyFile +
 179                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 180                         }
 181                         catch (System.IO.IOException io) {
 182                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 183                         }
 184                         catch (System.UnauthorizedAccessException ua) {
 185                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 186                         }
 187
 188                         if (SymbolWriter != null)
 189                                 SymbolWriter.WriteSymbolFile ();
 190                 }
 191         }
 192
 193         //
 194         // Provides "local" store across code that can yield: locals
 195         // or fields, notice that this should not be used by anonymous
 196         // methods to create local storage, those only require
 197         // variable mapping.
 198         //
 199         public class VariableStorage {
 200                 FieldBuilder fb;
 201                 LocalBuilder local;
 202
 203                 static int count;
 204
 205                 public VariableStorage (EmitContext ec, Type t)
 206                 {
 207                         count++;
 208                         if (ec.InIterator)
 209                                 fb = ec.CurrentIterator.MapVariable ("s_", count.ToString (), t);
 210                         else
 211                                 local = ec.ig.DeclareLocal (t);
 212                 }
 213
 214                 public void EmitThis (ILGenerator ig)
 215                 {
 216                         if (fb != null)
 217                                 ig.Emit (OpCodes.Ldarg_0);
 218                 }
 219
 220                 public void EmitStore (ILGenerator ig)
 221                 {
 222                         if (fb == null)
 223                                 ig.Emit (OpCodes.Stloc, local);
 224                         else
 225                                 ig.Emit (OpCodes.Stfld, fb);
 226                 }
 227
 228                 public void EmitLoad (ILGenerator ig)
 229                 {
 230                         if (fb == null)
 231                                 ig.Emit (OpCodes.Ldloc, local);
 232                         else
 233                                 ig.Emit (OpCodes.Ldfld, fb);
 234                 }
 235
 236                 public void EmitLoadAddress (ILGenerator ig)
 237                 {
 238                         if (fb == null)
 239                                 ig.Emit (OpCodes.Ldloca, local);
 240                         else
 241                                 ig.Emit (OpCodes.Ldflda, fb);
 242                 }
 243
 244                 public void EmitCall (ILGenerator ig, MethodInfo mi)
 245                 {
 246                         // FIXME : we should handle a call like tostring
 247                         // here, where boxing is needed. However, we will
 248                         // never encounter that with the current usage.
 249
 250                         bool value_type_call;
 251                         EmitThis (ig);
 252                         if (fb == null) {
 253                                 value_type_call = local.LocalType.IsValueType;
 254
 255                                 if (value_type_call)
 256                                         ig.Emit (OpCodes.Ldloca, local);
 257                                 else
 258                                         ig.Emit (OpCodes.Ldloc, local);
 259                         } else {
 260                                 value_type_call = fb.FieldType.IsValueType;
 261
 262                                 if (value_type_call)
 263                                         ig.Emit (OpCodes.Ldflda, fb);
 264                                 else
 265                                         ig.Emit (OpCodes.Ldfld, fb);
 266                         }
 267
 268                         ig.Emit (value_type_call ? OpCodes.Call : OpCodes.Callvirt, mi);
 269                 }
 270         }
 271
 272         /// <summary>
 273         ///   An Emit Context is created for each body of code (from methods,
 274         ///   properties bodies, indexer bodies or constructor bodies)
 275         /// </summary>
 276         public class EmitContext {
 277                 public DeclSpace DeclSpace;
 278                 public DeclSpace TypeContainer;
 279                 public ILGenerator   ig;
 280
 281                 /// <summary>
 282                 ///   This variable tracks the `checked' state of the compilation,
 283                 ///   it controls whether we should generate code that does overflow
 284                 ///   checking, or if we generate code that ignores overflows.
 285                 ///
 286                 ///   The default setting comes from the command line option to generate
 287                 ///   checked or unchecked code plus any source code changes using the
 288                 ///   checked/unchecked statements or expressions.   Contrast this with
 289                 ///   the ConstantCheckState flag.
 290                 /// </summary>
 291
 292                 public bool CheckState;
 293
 294                 /// <summary>
 295                 ///   The constant check state is always set to `true' and cant be changed
 296                 ///   from the command line.  The source code can change this setting with
 297                 ///   the `checked' and `unchecked' statements and expressions.
 298                 /// </summary>
 299                 public bool ConstantCheckState;
 300
 301                 /// <summary>
 302                 ///   Whether we are emitting code inside a static or instance method
 303                 /// </summary>
 304                 public bool IsStatic;
 305
 306                 /// <summary>
 307                 ///   Whether the actual created method is static or instance method.
 308                 ///   Althoug the method might be declared as `static', if an anonymous
 309                 ///   method is involved, we might turn this into an instance method.
 310                 ///
 311                 ///   So this reflects the low-level staticness of the method, while
 312                 ///   IsStatic represents the semantic, high-level staticness.
 313                 /// </summary>
 314                 public bool MethodIsStatic;
 315
 316                 /// <summary>
 317                 ///   Whether we are emitting a field initializer
 318                 /// </summary>
 319                 public bool IsFieldInitializer;
 320
 321                 /// <summary>
 322                 ///   The value that is allowed to be returned or NULL if there is no
 323                 ///   return type.
 324                 /// </summary>
 325                 public Type ReturnType;
 326
 327                 /// <summary>
 328                 ///   Points to the Type (extracted from the TypeContainer) that
 329                 ///   declares this body of code
 330                 /// </summary>
 331                 public Type ContainerType;
 332
 333                 /// <summary>
 334                 ///   Whether this is generating code for a constructor
 335                 /// </summary>
 336                 public bool IsConstructor;
 337
 338                 /// <summary>
 339                 ///   Whether we're control flow analysis enabled
 340                 /// </summary>
 341                 public bool DoFlowAnalysis;
 342
 343                 /// <summary>
 344                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 345                 ///   to store structures (used to compute the address of the structure
 346                 ///   value on structure method invocations)
 347                 /// </summary>
 348                 public Hashtable temporary_storage;
 349
 350                 public Block CurrentBlock;
 351
 352                 public int CurrentFile;
 353
 354                 /// <summary>
 355                 ///   The location where we store the return value.
 356                 /// </summary>
 357                 LocalBuilder return_value;
 358
 359                 /// <summary>
 360                 ///   The location where return has to jump to return the
 361                 ///   value
 362                 /// </summary>
 363                 public Label ReturnLabel;
 364
 365                 /// <summary>
 366                 ///   If we already defined the ReturnLabel
 367                 /// </summary>
 368                 public bool HasReturnLabel;
 369
 370                 /// <summary>
 371                 ///   Whether we are inside an iterator block.
 372                 /// </summary>
 373                 public bool InIterator;
 374
 375                 public bool IsLastStatement;
 376
 377                 /// <summary>
 378                 ///   Whether remapping of locals, parameters and fields is turned on.
 379                 ///   Used by iterators and anonymous methods.
 380                 /// </summary>
 381                 public bool RemapToProxy;
 382
 383                 /// <summary>
 384                 ///  Whether we are inside an unsafe block
 385                 /// </summary>
 386                 public bool InUnsafe;
 387
 388                 /// <summary>
 389                 ///  Whether we are in a `fixed' initialization
 390                 /// </summary>
 391                 public bool InFixedInitializer;
 392
 393                 /// <summary>
 394                 ///  Whether we are inside an anonymous method.
 395                 /// </summary>
 396                 public AnonymousMethod CurrentAnonymousMethod;
 397
 398                 /// <summary>
 399                 ///   Location for this EmitContext
 400                 /// </summary>
 401                 public Location loc;
 402
 403                 /// <summary>
 404                 ///   Inside an enum definition, we do not resolve enumeration values
 405                 ///   to their enumerations, but rather to the underlying type/value
 406                 ///   This is so EnumVal + EnumValB can be evaluated.
 407                 ///
 408                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 409                 ///   we relax the rules
 410                 /// </summary>
 411                 public bool InEnumContext;
 412
 413                 /// <summary>
 414                 ///   Anonymous methods can capture local variables and fields,
 415                 ///   this object tracks it.  It is copied from the TopLevelBlock
 416                 ///   field.
 417                 /// </summary>
 418                 public CaptureContext capture_context;
 419
 420                 /// <summary>
 421                 /// Trace when method is called and is obsolete then this member suppress message
 422                 /// when call is inside next [Obsolete] method or type.
 423                 /// </summary>
 424                 public bool TestObsoleteMethodUsage = true;
 425
 426                 /// <summary>
 427                 ///    The current iterator
 428                 /// </summary>
 429                 public Iterator CurrentIterator;
 430
 431                 /// <summary>
 432                 ///    Whether we are in the resolving stage or not
 433                 /// </summary>
 434                 enum Phase {
 435                         Created,
 436                         Resolving,
 437                         Emitting
 438                 }
 439
 440                 Phase current_phase;
 441                 FlowBranching current_flow_branching;
 442
 443                 public EmitContext (DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 444                                     Type return_type, int code_flags, bool is_constructor)
 445                 {
 446                         this.ig = ig;
 447
 448                         TypeContainer = parent;
 449                         DeclSpace = ds;
 450                         CheckState = RootContext.Checked;
 451                         ConstantCheckState = true;
 452
 453                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 454                         MethodIsStatic = IsStatic;
 455                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 456                         RemapToProxy = InIterator;
 457                         ReturnType = return_type;
 458                         IsConstructor = is_constructor;
 459                         CurrentBlock = null;
 460                         CurrentFile = 0;
 461                         current_phase = Phase.Created;
 462
 463                         if (parent != null){
 464                                 // Can only be null for the ResolveType contexts.
 465                                 ContainerType = parent.TypeBuilder;
 466                                 if (parent.UnsafeContext)
 467                                         InUnsafe = true;
 468                                 else
 469                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 470                         }
 471                         loc = l;
 472
 473                         if (ReturnType == TypeManager.void_type)
 474                                 ReturnType = null;
 475                 }
 476
 477                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 478                                     Type return_type, int code_flags, bool is_constructor)
 479                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 480                 {
 481                 }
 482
 483                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 484                                     Type return_type, int code_flags)
 485                         : this (tc, tc, l, ig, return_type, code_flags, false)
 486                 {
 487                 }
 488
 489                 public FlowBranching CurrentBranching {
 490                         get {
 491                                 return current_flow_branching;
 492                         }
 493                 }
 494
 495                 public bool HaveCaptureInfo {
 496                         get {
 497                                 return capture_context != null;
 498                         }
 499                 }
 500
 501                 // <summary>
 502                 //   Starts a new code branching.  This inherits the state of all local
 503                 //   variables and parameters from the current branching.
 504                 // </summary>
 505                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 506                 {
 507                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 508                         return current_flow_branching;
 509                 }
 510
 511                 // <summary>
 512                 //   Starts a new code branching for block `block'.
 513                 // </summary>
 514                 public FlowBranching StartFlowBranching (Block block)
 515                 {
 516                         FlowBranching.BranchingType type;
 517
 518                         if (CurrentBranching.Type == FlowBranching.BranchingType.Switch)
 519                                 type = FlowBranching.BranchingType.SwitchSection;
 520                         else
 521                                 type = FlowBranching.BranchingType.Block;
 522
 523                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, block, block.StartLocation);
 524                         return current_flow_branching;
 525                 }
 526
 527                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 528                 {
 529                         FlowBranchingException branching = new FlowBranchingException (
 530                                 CurrentBranching, stmt);
 531                         current_flow_branching = branching;
 532                         return branching;
 533                 }
 534
 535                 // <summary>
 536                 //   Ends a code branching.  Merges the state of locals and parameters
 537                 //   from all the children of the ending branching.
 538                 // </summary>
 539                 public FlowBranching.UsageVector DoEndFlowBranching ()
 540                 {
 541                         FlowBranching old = current_flow_branching;
 542                         current_flow_branching = current_flow_branching.Parent;
 543
 544                         return current_flow_branching.MergeChild (old);
 545                 }
 546
 547                 // <summary>
 548                 //   Ends a code branching.  Merges the state of locals and parameters
 549                 //   from all the children of the ending branching.
 550                 // </summary>
 551                 public FlowBranching.Reachability EndFlowBranching ()
 552                 {
 553                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 554
 555                         return vector.Reachability;
 556                 }
 557
 558                 // <summary>
 559                 //   Kills the current code branching.  This throws away any changed state
 560                 //   information and should only be used in case of an error.
 561                 // </summary>
 562                 public void KillFlowBranching ()
 563                 {
 564                         current_flow_branching = current_flow_branching.Parent;
 565                 }
 566
 567                 public void CaptureVariable (LocalInfo li)
 568                 {
 569                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 570                         li.IsCaptured = true;
 571                 }
 572
 573                 public void CaptureParameter (string name, Type t, int idx)
 574                 {
 575                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 576                 }
 577
 578                 public void CaptureThis ()
 579                 {
 580                         capture_context.CaptureThis ();
 581                 }
 582
 583
 584                 //
 585                 // Use to register a field as captured
 586                 //
 587                 public void CaptureField (FieldExpr fe)
 588                 {
 589                         capture_context.AddField (fe);
 590                 }
 591
 592                 //
 593                 // Whether anonymous methods have captured variables
 594                 //
 595                 public bool HaveCapturedVariables ()
 596                 {
 597                         if (capture_context != null)
 598                                 return capture_context.HaveCapturedVariables;
 599                         return false;
 600                 }
 601
 602                 //
 603                 // Whether anonymous methods have captured fields or this.
 604                 //
 605                 public bool HaveCapturedFields ()
 606                 {
 607                         if (capture_context != null)
 608                                 return capture_context.HaveCapturedFields;
 609                         return false;
 610                 }
 611
 612                 //
 613                 // Emits the instance pointer for the host method
 614                 //
 615                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 616                 {
 617                         if (capture_context != null)
 618                                 capture_context.EmitMethodHostInstance (target, am);
 619                         else if (IsStatic)
 620                                 target.ig.Emit (OpCodes.Ldnull);
 621                         else
 622                                 target.ig.Emit (OpCodes.Ldarg_0);
 623                 }
 624
 625                 //
 626                 // Returns whether the `local' variable has been captured by an anonymous
 627                 // method
 628                 //
 629                 public bool IsCaptured (LocalInfo local)
 630                 {
 631                         return capture_context.IsCaptured (local);
 632                 }
 633
 634                 public bool IsParameterCaptured (string name)
 635                 {
 636                         if (capture_context != null)
 637                                 return capture_context.IsParameterCaptured (name);
 638                         return false;
 639                 }
 640
 641                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 642                 {
 643                         if (capture_context != null)
 644                                 capture_context.EmitAnonymousHelperClasses (this);
 645                         b.EmitMeta (this);
 646
 647                         if (HasReturnLabel)
 648                                 ReturnLabel = ig.DefineLabel ();
 649                 }
 650
 651                 //
 652                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 653                 // currently can not cope with ig == null during resolve (which must
 654                 // be fixed for switch statements to work on anonymous methods).
 655                 //
 656                 public void EmitTopBlock (ToplevelBlock block, InternalParameters ip, Location loc)
 657                 {
 658                         if (block == null)
 659                                 return;
 660
 661                         bool unreachable;
 662
 663                         if (ResolveTopBlock (null, block, ip, loc, out unreachable)){
 664                                 EmitMeta (block, ip);
 665
 666                                 current_phase = Phase.Emitting;
 667                                 EmitResolvedTopBlock (block, unreachable);
 668                         }
 669                 }
 670
 671                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 672                                              InternalParameters ip, Location loc, out bool unreachable)
 673                 {
 674                         current_phase = Phase.Resolving;
 675
 676                         unreachable = false;
 677
 678                         capture_context = block.CaptureContext;
 679
 680                         if (!Location.IsNull (loc))
 681                                 CurrentFile = loc.File;
 682
 683 #if PRODUCTION
 684                         try {
 685 #endif
 686                                 int errors = Report.Errors;
 687
 688                                 block.ResolveMeta (block, this, ip);
 689                                 if (Report.Errors != errors)
 690                                         return false;
 691
 692                                         bool old_do_flow_analysis = DoFlowAnalysis;
 693                                         DoFlowAnalysis = true;
 694
 695                                         if (anonymous_method_host != null)
 696                                                 current_flow_branching = FlowBranching.CreateBranching (
 697                                                 anonymous_method_host.CurrentBranching, FlowBranching.BranchingType.Block,
 698                                                 block, loc);
 699                                         else
 700                                                 current_flow_branching = FlowBranching.CreateBranching (
 701                                                         null, FlowBranching.BranchingType.Block, block, loc);
 702
 703                                         if (!block.Resolve (this)) {
 704                                                 current_flow_branching = null;
 705                                                 DoFlowAnalysis = old_do_flow_analysis;
 706                                                 return false;
 707                                         }
 708
 709                                         FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 710                                         current_flow_branching = null;
 711
 712                                         DoFlowAnalysis = old_do_flow_analysis;
 713
 714                                         if (reachability.AlwaysReturns ||
 715                                             reachability.AlwaysThrows ||
 716                                             reachability.IsUnreachable)
 717                                                 unreachable = true;
 718 #if PRODUCTION
 719                         } catch (Exception e) {
 720                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 721                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 722
 723                                         if (CurrentBlock != null){
 724                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 725                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 726                                         }
 727                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 728                                         throw;
 729                         }
 730 #endif
 731
 732                         if (ReturnType != null && !unreachable){
 733                                 if (!InIterator){
 734                                         if (CurrentAnonymousMethod != null){
 735                                                 Report.Error (1643, loc, "Not all code paths return a value in anonymous method of type `{0}'",
 736                                                               CurrentAnonymousMethod.Type);
 737                                         } else {
 738                                                 Report.Error (161, loc, "Not all code paths return a value");
 739                                         }
 740
 741                                         return false;
 742                                 }
 743                         }
 744                         block.CompleteContexts ();
 745
 746                         return true;
 747                 }
 748
 749                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 750                 {
 751                         if (block != null)
 752                                 block.Emit (this);
 753
 754                         if (HasReturnLabel)
 755                                 ig.MarkLabel (ReturnLabel);
 756
 757                         if (return_value != null){
 758                                 ig.Emit (OpCodes.Ldloc, return_value);
 759                                 ig.Emit (OpCodes.Ret);
 760                         } else {
 761                                 //
 762                                 // If `HasReturnLabel' is set, then we already emitted a
 763                                 // jump to the end of the method, so we must emit a `ret'
 764                                 // there.
 765                                 //
 766                                 // Unfortunately, System.Reflection.Emit automatically emits
 767                                 // a leave to the end of a finally block.  This is a problem
 768                                 // if no code is following the try/finally block since we may
 769                                 // jump to a point after the end of the method.
 770                                 // As a workaround, we're always creating a return label in
 771                                 // this case.
 772                                 //
 773
 774                                 if ((block != null) && block.IsDestructor) {
 775                                         // Nothing to do; S.R.E automatically emits a leave.
 776                                 } else if (HasReturnLabel || (!unreachable && !InIterator)) {
 777                                         if (ReturnType != null)
 778                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 779                                         ig.Emit (OpCodes.Ret);
 780                                 }
 781                         }
 782
 783                         //
 784                         // Close pending helper classes if we are the toplevel
 785                         //
 786                         if (capture_context != null && capture_context.ParentToplevel == null)
 787                                 capture_context.CloseAnonymousHelperClasses ();
 788                 }
 789
 790                 /// <summary>
 791                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 792                 ///   writer to which source line this opcode belongs.
 793                 /// </summary>
 794                 public void Mark (Location loc, bool check_file)
 795                 {
 796                         if ((CodeGen.SymbolWriter == null) || Location.IsNull (loc))
 797                                 return;
 798
 799                         if (check_file && (CurrentFile != loc.File))
 800                                 return;
 801
 802                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, 0);
 803                 }
 804
 805                 public void DefineLocalVariable (string name, LocalBuilder builder)
 806                 {
 807                         if (CodeGen.SymbolWriter == null)
 808                                 return;
 809
 810                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 811                 }
 812
 813                 public void BeginScope ()
 814                 {
 815                         ig.BeginScope();
 816
 817                         if (CodeGen.SymbolWriter != null)
 818                                 CodeGen.SymbolWriter.OpenScope(ig);
 819                 }
 820
 821                 public void EndScope ()
 822                 {
 823                         ig.EndScope();
 824
 825                         if (CodeGen.SymbolWriter != null)
 826                                 CodeGen.SymbolWriter.CloseScope(ig);
 827                 }
 828
 829                 /// <summary>
 830                 ///   Returns a temporary storage for a variable of type t as
 831                 ///   a local variable in the current body.
 832                 /// </summary>
 833                 public LocalBuilder GetTemporaryLocal (Type t)
 834                 {
 835                         LocalBuilder location = null;
 836
 837                         if (temporary_storage != null){
 838                                 object o = temporary_storage [t];
 839                                 if (o != null){
 840                                         if (o is ArrayList){
 841                                                 ArrayList al = (ArrayList) o;
 842
 843                                                 for (int i = 0; i < al.Count; i++){
 844                                                         if (al [i] != null){
 845                                                                 location = (LocalBuilder) al [i];
 846                                                                 al [i] = null;
 847                                                                 break;
 848                                                         }
 849                                                 }
 850                                         } else
 851                                                 location = (LocalBuilder) o;
 852                                         if (location != null)
 853                                                 return location;
 854                                 }
 855                         }
 856
 857                         return ig.DeclareLocal (t);
 858                 }
 859
 860                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 861                 {
 862                         if (temporary_storage == null){
 863                                 temporary_storage = new Hashtable ();
 864                                 temporary_storage [t] = b;
 865                                 return;
 866                         }
 867                         object o = temporary_storage [t];
 868                         if (o == null){
 869                                 temporary_storage [t] = b;
 870                                 return;
 871                         }
 872                         if (o is ArrayList){
 873                                 ArrayList al = (ArrayList) o;
 874                                 for (int i = 0; i < al.Count; i++){
 875                                         if (al [i] == null){
 876                                                 al [i] = b;
 877                                                 return;
 878                                         }
 879                                 }
 880                                 al.Add (b);
 881                                 return;
 882                         }
 883                         ArrayList replacement = new ArrayList ();
 884                         replacement.Add (o);
 885                         temporary_storage.Remove (t);
 886                         temporary_storage [t] = replacement;
 887                 }
 888
 889                 /// <summary>
 890                 ///   Current loop begin and end labels.
 891                 /// </summary>
 892                 public Label LoopBegin, LoopEnd;
 893
 894                 /// <summary>
 895                 ///   Default target in a switch statement.   Only valid if
 896                 ///   InSwitch is true
 897                 /// </summary>
 898                 public Label DefaultTarget;
 899
 900                 /// <summary>
 901                 ///   If this is non-null, points to the current switch statement
 902                 /// </summary>
 903                 public Switch Switch;
 904
 905                 /// <summary>
 906                 ///   ReturnValue creates on demand the LocalBuilder for the
 907                 ///   return value from the function.  By default this is not
 908                 ///   used.  This is only required when returns are found inside
 909                 ///   Try or Catch statements.
 910                 ///
 911                 ///   This method is typically invoked from the Emit phase, so
 912                 ///   we allow the creation of a return label if it was not
 913                 ///   requested during the resolution phase.   Could be cleaned
 914                 ///   up, but it would replicate a lot of logic in the Emit phase
 915                 ///   of the code that uses it.
 916                 /// </summary>
 917                 public LocalBuilder TemporaryReturn ()
 918                 {
 919                         if (return_value == null){
 920                                 return_value = ig.DeclareLocal (ReturnType);
 921                                 if (!HasReturnLabel){
 922                                         ReturnLabel = ig.DefineLabel ();
 923                                         HasReturnLabel = true;
 924                                 }
 925                         }
 926
 927                         return return_value;
 928                 }
 929
 930                 /// <summary>
 931                 ///   This method is used during the Resolution phase to flag the
 932                 ///   need to define the ReturnLabel
 933                 /// </summary>
 934                 public void NeedReturnLabel ()
 935                 {
 936                         if (current_phase != Phase.Resolving){
 937                                 //
 938                                 // The reason is that the `ReturnLabel' is declared between
 939                                 // resolution and emission
 940                                 //
 941                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 942                         }
 943
 944                         if (!InIterator && !HasReturnLabel)
 945                                 HasReturnLabel = true;
 946                 }
 947
 948                 //
 949                 // Creates a field `name' with the type `t' on the proxy class
 950                 //
 951                 public FieldBuilder MapVariable (string name, Type t)
 952                 {
 953                         if (InIterator)
 954                                 return CurrentIterator.MapVariable ("v_", name, t);
 955
 956                         throw new Exception ("MapVariable for an unknown state");
 957                 }
 958
 959                 public Expression RemapParameter (int idx)
 960                 {
 961                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 962                         fe.InstanceExpression = new ProxyInstance ();
 963                         return fe.DoResolve (this);
 964                 }
 965
 966                 public Expression RemapParameterLValue (int idx, Expression right_side)
 967                 {
 968                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 969                         fe.InstanceExpression = new ProxyInstance ();
 970                         return fe.DoResolveLValue (this, right_side);
 971                 }
 972
 973                 //
 974                 // Emits the proper object to address fields on a remapped
 975                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 976                 //
 977                 public void EmitThis ()
 978                 {
 979                         ig.Emit (OpCodes.Ldarg_0);
 980                         if (InIterator){
 981                                 if (!IsStatic){
 982                                         FieldBuilder this_field = CurrentIterator.this_field.FieldBuilder;
 983                                         if (TypeManager.IsValueType (this_field.FieldType))
 984                                                 ig.Emit (OpCodes.Ldflda, this_field);
 985                                         else
 986                                                 ig.Emit (OpCodes.Ldfld, this_field);
 987                                 }
 988                         } else if (capture_context != null && CurrentAnonymousMethod != null){
 989                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 990                                 while (si != null){
 991                                         if (si.ParentLink != null)
 992                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 993                                         if (si.THIS != null){
 994                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 995                                                 break;
 996                                         }
 997                                         si = si.ParentScope;
 998                                 }
 999                         }
1000                 }
1001
1002                 //
1003                 // Emits the code necessary to load the instance required
1004                 // to access the captured LocalInfo
1005                 //
1006                 public void EmitCapturedVariableInstance (LocalInfo li)
1007                 {
1008                         if (RemapToProxy){
1009                                 ig.Emit (OpCodes.Ldarg_0);
1010                                 return;
1011                         }
1012
1013                         if (capture_context == null)
1014                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
1015
1016                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1017                 }
1018
1019                 public void EmitParameter (string name)
1020                 {
1021                         capture_context.EmitParameter (this, name);
1022                 }
1023
1024                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
1025                 {
1026                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
1027                 }
1028
1029                 public void EmitAddressOfParameter (string name)
1030                 {
1031                         capture_context.EmitAddressOfParameter (this, name);
1032                 }
1033
1034                 public Expression GetThis (Location loc)
1035                 {
1036                         This my_this;
1037                         if (CurrentBlock != null)
1038                                 my_this = new This (CurrentBlock, loc);
1039                         else
1040                                 my_this = new This (loc);
1041
1042                         if (!my_this.ResolveBase (this))
1043                                 my_this = null;
1044
1045                         return my_this;
1046                 }
1047         }
1048
1049
1050         public abstract class CommonAssemblyModulClass: Attributable {
1051                 protected CommonAssemblyModulClass ():
1052                         base (null)
1053                 {
1054                 }
1055
1056                 public void AddAttributes (ArrayList attrs)
1057                 {
1058                         if (OptAttributes == null) {
1059                                 OptAttributes = new Attributes (attrs);
1060                                 return;
1061                         }
1062                         OptAttributes.AddAttributes (attrs);
1063                 }
1064
1065                 public virtual void Emit (TypeContainer tc)
1066                 {
1067                         if (OptAttributes == null)
1068                                 return;
1069
1070                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
1071                         OptAttributes.Emit (ec, this);
1072                 }
1073
1074                 protected Attribute GetClsCompliantAttribute ()
1075                 {
1076                         if (OptAttributes == null)
1077                                 return null;
1078
1079                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1080                         if (!OptAttributes.CheckTargets (this))
1081                                 return null;
1082
1083                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1084                         Attribute a = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, temp_ec);
1085                         if (a != null) {
1086                                 a.Resolve (temp_ec);
1087                         }
1088                         return a;
1089                 }
1090         }
1091
1092         public class AssemblyClass: CommonAssemblyModulClass {
1093                 // TODO: make it private and move all builder based methods here
1094                 public AssemblyBuilder Builder;
1095                 bool is_cls_compliant;
1096                 public Attribute ClsCompliantAttribute;
1097
1098                 ListDictionary declarative_security;
1099
1100                 static string[] attribute_targets = new string [] { "assembly" };
1101
1102                 public AssemblyClass (): base ()
1103                 {
1104                         is_cls_compliant = false;
1105                 }
1106
1107                 public bool IsClsCompliant {
1108                         get {
1109                                 return is_cls_compliant;
1110                         }
1111                 }
1112
1113                 public override AttributeTargets AttributeTargets {
1114                         get {
1115                                 return AttributeTargets.Assembly;
1116                         }
1117                 }
1118
1119                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1120                 {
1121                         return is_cls_compliant;
1122                 }
1123
1124                 public void ResolveClsCompliance ()
1125                 {
1126                         ClsCompliantAttribute = GetClsCompliantAttribute ();
1127                         if (ClsCompliantAttribute == null)
1128                                 return;
1129
1130                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1131                 }
1132
1133                 // fix bug #56621
1134                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1135                 {
1136                         try {
1137                                 // check for possible ECMA key
1138                                 if (strongNameBlob.Length == 16) {
1139                                         // will be rejected if not "the" ECMA key
1140                                         an.SetPublicKey (strongNameBlob);
1141                                 }
1142                                 else {
1143                                         // take it, with or without, a private key
1144                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1145                                         // and make sure we only feed the public part to Sys.Ref
1146                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1147
1148                                         // AssemblyName.SetPublicKey requires an additional header
1149                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1150
1151                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1152                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1153                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1154                                         an.SetPublicKey (encodedPublicKey);
1155                                 }
1156                         }
1157                         catch (Exception) {
1158                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1159                                         RootContext.StrongNameKeyFile + "' incorrectly encoded.");
1160                                 Environment.Exit (1);
1161                         }
1162                 }
1163
1164                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1165                 public AssemblyName GetAssemblyName (string name, string output)
1166                 {
1167                         if (OptAttributes != null) {
1168                                 foreach (Attribute a in OptAttributes.Attrs) {
1169                                         // cannot rely on any resolve-based members before you call Resolve
1170                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1171                                                 continue;
1172
1173                                         // TODO: This code is buggy: comparing Attribute name without resolving it is wrong.
1174                                         //       However, this is invoked by CodeGen.Init, at which time none of the namespaces
1175                                         //       are loaded yet.
1176                                         switch (a.Name) {
1177                                                 case "AssemblyKeyFile":
1178                                                 case "AssemblyKeyFileAttribute":
1179                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1180                                                         if (RootContext.StrongNameKeyFile != null) {
1181                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1182                                                                 Report.Warning (1616, "Compiler option '{0}' overrides '{1}' given in source", "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1183                                                         }
1184                                                         else {
1185                                                                 string value = a.GetString ();
1186                                                                 if (value != String.Empty)
1187                                                                         RootContext.StrongNameKeyFile = value;
1188                                                         }
1189                                                         break;
1190                                                 case "AssemblyKeyName":
1191                                                 case "AssemblyKeyNameAttribute":
1192                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1193                                                         if (RootContext.StrongNameKeyContainer != null) {
1194                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1195                                                                 Report.Warning (1616, "keycontainer", "Compiler option '{0}' overrides '{1}' given in source", "System.Reflection.AssemblyKeyNameAttribute");
1196                                                         }
1197                                                         else {
1198                                                                 string value = a.GetString ();
1199                                                                 if (value != String.Empty)
1200                                                                         RootContext.StrongNameKeyContainer = value;
1201                                                         }
1202                                                         break;
1203                                                 case "AssemblyDelaySign":
1204                                                 case "AssemblyDelaySignAttribute":
1205                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1206                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1207                                                         break;
1208                                         }
1209                                 }
1210                         }
1211
1212                         AssemblyName an = new AssemblyName ();
1213                         an.Name = Path.GetFileNameWithoutExtension (name);
1214
1215                         // note: delay doesn't apply when using a key container
1216                         if (RootContext.StrongNameKeyContainer != null) {
1217                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1218                                 return an;
1219                         }
1220
1221                         // strongname is optional
1222                         if (RootContext.StrongNameKeyFile == null)
1223                                 return an;
1224
1225                         string AssemblyDir = Path.GetDirectoryName (output);
1226
1227                         // the StrongName key file may be relative to (a) the compiled
1228                         // file or (b) to the output assembly. See bugzilla #55320
1229                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1230
1231                         // (a) relative to the compiled file
1232                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1233                         bool exist = File.Exists (filename);
1234                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1235                                 // (b) relative to the outputed assembly
1236                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1237                                 exist = File.Exists (filename);
1238                         }
1239
1240                         if (exist) {
1241                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1242                                         byte[] snkeypair = new byte [fs.Length];
1243                                         fs.Read (snkeypair, 0, snkeypair.Length);
1244
1245                                         if (RootContext.StrongNameDelaySign) {
1246                                                 // delayed signing - DO NOT include private key
1247                                                 SetPublicKey (an, snkeypair);
1248                                         }
1249                                         else {
1250                                                 // no delay so we make sure we have the private key
1251                                                 try {
1252                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1253                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1254                                                 }
1255                                                 catch (CryptographicException) {
1256                                                         if (snkeypair.Length == 16) {
1257                                                                 // error # is different for ECMA key
1258                                                                 Report.Error (1606, "Could not strongname the assembly. " +
1259                                                                         "ECMA key can only be used to delay-sign assemblies");
1260                                                         }
1261                                                         else {
1262                                                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1263                                                                         RootContext.StrongNameKeyFile +
1264                                                                         "' doesn't have a private key.");
1265                                                         }
1266                                                         return null;
1267                                                 }
1268                                         }
1269                                 }
1270                         }
1271                         else {
1272                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1273                                         RootContext.StrongNameKeyFile + "' not found.");
1274                                 return null;
1275                         }
1276                         return an;
1277                 }
1278
1279                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1280                 {
1281                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1282                                 if (declarative_security == null)
1283                                         declarative_security = new ListDictionary ();
1284
1285                                 a.ExtractSecurityPermissionSet (declarative_security);
1286                                 return;
1287                         }
1288
1289                         Builder.SetCustomAttribute (customBuilder);
1290                 }
1291
1292                 public override void Emit (TypeContainer tc)
1293                 {
1294                         base.Emit (tc);
1295
1296                         if (declarative_security != null) {
1297
1298                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1299                                 object builder_instance = Builder;
1300
1301                                 try {
1302                                         // Microsoft runtime hacking
1303                                         if (add_permission == null) {
1304                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1305                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1306
1307                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1308                                                 builder_instance = fi.GetValue (Builder);
1309                                         }
1310
1311                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1312                                                                                                   declarative_security [SecurityAction.RequestOptional],
1313                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1314                                         add_permission.Invoke (builder_instance, args);
1315                                 }
1316                                 catch {
1317                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1318                                 }
1319                         }
1320                 }
1321
1322                 public override string[] ValidAttributeTargets {
1323                         get {
1324                                 return attribute_targets;
1325                         }
1326                 }
1327         }
1328
1329         public class ModuleClass: CommonAssemblyModulClass {
1330                 // TODO: make it private and move all builder based methods here
1331                 public ModuleBuilder Builder;
1332                 bool m_module_is_unsafe;
1333
1334                 static string[] attribute_targets = new string [] { "module" };
1335
1336                 public ModuleClass (bool is_unsafe)
1337                 {
1338                         m_module_is_unsafe = is_unsafe;
1339                 }
1340
1341                 public override AttributeTargets AttributeTargets {
1342                         get {
1343                                 return AttributeTargets.Module;
1344                         }
1345                 }
1346
1347                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1348                 {
1349                         return CodeGen.Assembly.IsClsCompliant;
1350                 }
1351
1352                 public override void Emit (TypeContainer tc)
1353                 {
1354                         base.Emit (tc);
1355
1356                         if (!m_module_is_unsafe)
1357                                 return;
1358
1359                         if (TypeManager.unverifiable_code_ctor == null) {
1360                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1361                                 return;
1362                         }
1363
1364                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1365                 }
1366
1367                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1368                 {
1369                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1370                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1371                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1372                                 }
1373                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1374                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.Name);
1375                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1376                                         return;
1377                                 }
1378                         }
1379
1380                         Builder.SetCustomAttribute (customBuilder);
1381                 }
1382
1383                 public override string[] ValidAttributeTargets {
1384                         get {
1385                                 return attribute_targets;
1386                         }
1387                 }
1388         }
1389 }