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                         Assembly = new AssemblyClass ();
  39                         Module = new ModuleClass (RootContext.Unsafe);
  40                 }
  41
  42                 public static string Basename (string name)
  43                 {
  44                         int pos = name.LastIndexOf ('/');
  45
  46                         if (pos != -1)
  47                                 return name.Substring (pos + 1);
  48
  49                         pos = name.LastIndexOf ('\\');
  50                         if (pos != -1)
  51                                 return name.Substring (pos + 1);
  52
  53                         return name;
  54                 }
  55
  56                 public static string Dirname (string name)
  57                 {
  58                         int pos = name.LastIndexOf ('/');
  59
  60                         if (pos != -1)
  61                                 return name.Substring (0, pos);
  62
  63                         pos = name.LastIndexOf ('\\');
  64                         if (pos != -1)
  65                                 return name.Substring (0, pos);
  66
  67                         return ".";
  68                 }
  69
  70                 static string TrimExt (string name)
  71                 {
  72                         int pos = name.LastIndexOf ('.');
  73
  74                         return name.Substring (0, pos);
  75                 }
  76
  77                 static public string FileName;
  78
  79                 //
  80                 // Initializes the symbol writer
  81                 //
  82                 static void InitializeSymbolWriter (string filename)
  83                 {
  84                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  85
  86                         //
  87                         // If we got an ISymbolWriter instance, initialize it.
  88                         //
  89                         if (SymbolWriter == null) {
  90                                 Report.Warning (
  91                                         -18, "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll). This is normally an installation problem. Please make sure to compile and install the mcs/class/Mono.CompilerServices.SymbolWriter directory.");
  92                                 return;
  93                         }
  94                 }
  95
  96                 //
  97                 // Initializes the code generator variables
  98                 //
  99                 static public void Init (string name, string output, bool want_debugging_support)
 100                 {
 101                         FileName = output;
 102                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 103
 104                         if (an.KeyPair != null) {
 105                                 // If we are going to strong name our assembly make
 106                                 // sure all its refs are strong named
 107                                 foreach (Assembly a in TypeManager.GetAssemblies ()) {
 108                                         AssemblyName ref_name = a.GetName ();
 109                                         byte [] b = ref_name.GetPublicKeyToken ();
 110                                         if (b == null || b.Length == 0) {
 111                                                 Report.Warning (1577, "Assembly generation failed " +
 112                                                                 "-- Referenced assembly '" +
 113                                                                 ref_name.Name +
 114                                                                 "' does not have a strong name.");
 115                                                 //Environment.Exit (1);
 116                                         }
 117                                 }
 118                         }
 119
 120                         current_domain = AppDomain.CurrentDomain;
 121
 122                         try {
 123                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 124                                         AssemblyBuilderAccess.Save, Dirname (name));
 125                         }
 126                         catch (ArgumentException) {
 127                                 // specified key may not be exportable outside it's container
 128                                 if (RootContext.StrongNameKeyContainer != null) {
 129                                         Report.Error (1548, "Could not access the key inside the container `" +
 130                                                 RootContext.StrongNameKeyContainer + "'.");
 131                                         Environment.Exit (1);
 132                                 }
 133                                 throw;
 134                         }
 135                         catch (CryptographicException) {
 136                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 137                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 138                                         Environment.Exit (1);
 139                                 }
 140                                 throw;
 141                         }
 142
 143                         //
 144                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 145                         // this copes with output in different directories then.
 146                         // FIXME: figure out how this copes with --output /tmp/blah
 147                         //
 148                         // If the third argument is true, the ModuleBuilder will dynamically
 149                         // load the default symbol writer.
 150                         //
 151                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 152                                 Basename (name), Basename (output), false);
 153
 154                         if (want_debugging_support)
 155                                 InitializeSymbolWriter (output);
 156                 }
 157
 158                 static public void Save (string name)
 159                 {
 160                         try {
 161                                 Assembly.Builder.Save (Basename (name));
 162                         }
 163                         catch (COMException) {
 164                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 165                                         throw;
 166
 167                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 168                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 169                                         RootContext.StrongNameKeyFile +
 170                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 171                         }
 172                         catch (System.IO.IOException io) {
 173                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 174                         }
 175
 176                         if (SymbolWriter != null)
 177                                 SymbolWriter.WriteSymbolFile ();
 178                 }
 179         }
 180
 181         //
 182         // Provides "local" store across code that can yield: locals
 183         // or fields, notice that this should not be used by anonymous
 184         // methods to create local storage, those only require
 185         // variable mapping.
 186         //
 187         public class VariableStorage {
 188                 FieldBuilder fb;
 189                 LocalBuilder local;
 190
 191                 static int count;
 192
 193                 public VariableStorage (EmitContext ec, Type t)
 194                 {
 195                         count++;
 196                         if (ec.InIterator)
 197                                 fb = ec.CurrentIterator.MapVariable ("s_", count.ToString (), t);
 198                         else
 199                                 local = ec.ig.DeclareLocal (t);
 200                 }
 201
 202                 public void EmitThis (ILGenerator ig)
 203                 {
 204                         if (fb != null)
 205                                 ig.Emit (OpCodes.Ldarg_0);
 206                 }
 207
 208                 public void EmitStore (ILGenerator ig)
 209                 {
 210                         if (fb == null)
 211                                 ig.Emit (OpCodes.Stloc, local);
 212                         else
 213                                 ig.Emit (OpCodes.Stfld, fb);
 214                 }
 215
 216                 public void EmitLoad (ILGenerator ig)
 217                 {
 218                         if (fb == null)
 219                                 ig.Emit (OpCodes.Ldloc, local);
 220                         else
 221                                 ig.Emit (OpCodes.Ldfld, fb);
 222                 }
 223
 224                 public void EmitLoadAddress (ILGenerator ig)
 225                 {
 226                         if (fb == null)
 227                                 ig.Emit (OpCodes.Ldloca, local);
 228                         else
 229                                 ig.Emit (OpCodes.Ldflda, fb);
 230                 }
 231
 232                 public void EmitCall (ILGenerator ig, MethodInfo mi)
 233                 {
 234                         // FIXME : we should handle a call like tostring
 235                         // here, where boxing is needed. However, we will
 236                         // never encounter that with the current usage.
 237
 238                         bool value_type_call;
 239                         EmitThis (ig);
 240                         if (fb == null) {
 241                                 value_type_call = local.LocalType.IsValueType;
 242
 243                                 if (value_type_call)
 244                                         ig.Emit (OpCodes.Ldloca, local);
 245                                 else
 246                                         ig.Emit (OpCodes.Ldloc, local);
 247                         } else {
 248                                 value_type_call = fb.FieldType.IsValueType;
 249
 250                                 if (value_type_call)
 251                                         ig.Emit (OpCodes.Ldflda, fb);
 252                                 else
 253                                         ig.Emit (OpCodes.Ldfld, fb);
 254                         }
 255
 256                         ig.Emit (value_type_call ? OpCodes.Call : OpCodes.Callvirt, mi);
 257                 }
 258         }
 259
 260         /// <summary>
 261         ///   An Emit Context is created for each body of code (from methods,
 262         ///   properties bodies, indexer bodies or constructor bodies)
 263         /// </summary>
 264         public class EmitContext {
 265                 public DeclSpace DeclSpace;
 266                 public DeclSpace TypeContainer;
 267                 public ILGenerator   ig;
 268
 269                 /// <summary>
 270                 ///   This variable tracks the `checked' state of the compilation,
 271                 ///   it controls whether we should generate code that does overflow
 272                 ///   checking, or if we generate code that ignores overflows.
 273                 ///
 274                 ///   The default setting comes from the command line option to generate
 275                 ///   checked or unchecked code plus any source code changes using the
 276                 ///   checked/unchecked statements or expressions.   Contrast this with
 277                 ///   the ConstantCheckState flag.
 278                 /// </summary>
 279
 280                 public bool CheckState;
 281
 282                 /// <summary>
 283                 ///   The constant check state is always set to `true' and cant be changed
 284                 ///   from the command line.  The source code can change this setting with
 285                 ///   the `checked' and `unchecked' statements and expressions.
 286                 /// </summary>
 287                 public bool ConstantCheckState;
 288
 289                 /// <summary>
 290                 ///   Whether we are emitting code inside a static or instance method
 291                 /// </summary>
 292                 public bool IsStatic;
 293
 294                 /// <summary>
 295                 ///   Whether the actual created method is static or instance method.
 296                 ///   Althoug the method might be declared as `static', if an anonymous
 297                 ///   method is involved, we might turn this into an instance method.
 298                 ///
 299                 ///   So this reflects the low-level staticness of the method, while
 300                 ///   IsStatic represents the semantic, high-level staticness.
 301                 /// </summary>
 302                 public bool MethodIsStatic;
 303
 304                 /// <summary>
 305                 ///   Whether we are emitting a field initializer
 306                 /// </summary>
 307                 public bool IsFieldInitializer;
 308
 309                 /// <summary>
 310                 ///   The value that is allowed to be returned or NULL if there is no
 311                 ///   return type.
 312                 /// </summary>
 313                 public Type ReturnType;
 314
 315                 /// <summary>
 316                 ///   Points to the Type (extracted from the TypeContainer) that
 317                 ///   declares this body of code
 318                 /// </summary>
 319                 public Type ContainerType;
 320
 321                 /// <summary>
 322                 ///   Whether this is generating code for a constructor
 323                 /// </summary>
 324                 public bool IsConstructor;
 325
 326                 /// <summary>
 327                 ///   Whether we're control flow analysis enabled
 328                 /// </summary>
 329                 public bool DoFlowAnalysis;
 330
 331                 /// <summary>
 332                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 333                 ///   to store structures (used to compute the address of the structure
 334                 ///   value on structure method invocations)
 335                 /// </summary>
 336                 public Hashtable temporary_storage;
 337
 338                 public Block CurrentBlock;
 339
 340                 public int CurrentFile;
 341
 342                 /// <summary>
 343                 ///   The location where we store the return value.
 344                 /// </summary>
 345                 LocalBuilder return_value;
 346
 347                 /// <summary>
 348                 ///   The location where return has to jump to return the
 349                 ///   value
 350                 /// </summary>
 351                 public Label ReturnLabel;
 352
 353                 /// <summary>
 354                 ///   If we already defined the ReturnLabel
 355                 /// </summary>
 356                 public bool HasReturnLabel;
 357
 358                 /// <summary>
 359                 ///   Whether we are inside an iterator block.
 360                 /// </summary>
 361                 public bool InIterator;
 362
 363                 public bool IsLastStatement;
 364
 365                 /// <summary>
 366                 ///   Whether remapping of locals, parameters and fields is turned on.
 367                 ///   Used by iterators and anonymous methods.
 368                 /// </summary>
 369                 public bool RemapToProxy;
 370
 371                 /// <summary>
 372                 ///  Whether we are inside an unsafe block
 373                 /// </summary>
 374                 public bool InUnsafe;
 375
 376                 /// <summary>
 377                 ///  Whether we are in a `fixed' initialization
 378                 /// </summary>
 379                 public bool InFixedInitializer;
 380
 381                 /// <summary>
 382                 ///  Whether we are inside an anonymous method.
 383                 /// </summary>
 384                 public AnonymousMethod CurrentAnonymousMethod;
 385
 386                 /// <summary>
 387                 ///   Location for this EmitContext
 388                 /// </summary>
 389                 public Location loc;
 390
 391                 /// <summary>
 392                 ///   Inside an enum definition, we do not resolve enumeration values
 393                 ///   to their enumerations, but rather to the underlying type/value
 394                 ///   This is so EnumVal + EnumValB can be evaluated.
 395                 ///
 396                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 397                 ///   we relax the rules
 398                 /// </summary>
 399                 public bool InEnumContext;
 400
 401                 /// <summary>
 402                 ///   Anonymous methods can capture local variables and fields,
 403                 ///   this object tracks it.  It is copied from the TopLevelBlock
 404                 ///   field.
 405                 /// </summary>
 406                 public CaptureContext capture_context;
 407
 408                 /// <summary>
 409                 /// Trace when method is called and is obsolete then this member suppress message
 410                 /// when call is inside next [Obsolete] method or type.
 411                 /// </summary>
 412                 public bool TestObsoleteMethodUsage = true;
 413
 414                 /// <summary>
 415                 ///    The current iterator
 416                 /// </summary>
 417                 public Iterator CurrentIterator;
 418
 419                 /// <summary>
 420                 ///    Whether we are in the resolving stage or not
 421                 /// </summary>
 422                 enum Phase {
 423                         Created,
 424                         Resolving,
 425                         Emitting
 426                 }
 427
 428                 Phase current_phase;
 429                 FlowBranching current_flow_branching;
 430
 431                 public EmitContext (DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 432                                     Type return_type, int code_flags, bool is_constructor)
 433                 {
 434                         this.ig = ig;
 435
 436                         TypeContainer = parent;
 437                         DeclSpace = ds;
 438                         CheckState = RootContext.Checked;
 439                         ConstantCheckState = true;
 440
 441                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 442                         MethodIsStatic = IsStatic;
 443                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 444                         RemapToProxy = InIterator;
 445                         ReturnType = return_type;
 446                         IsConstructor = is_constructor;
 447                         CurrentBlock = null;
 448                         CurrentFile = 0;
 449                         current_phase = Phase.Created;
 450
 451                         if (parent != null){
 452                                 // Can only be null for the ResolveType contexts.
 453                                 ContainerType = parent.TypeBuilder;
 454                                 if (parent.UnsafeContext)
 455                                         InUnsafe = true;
 456                                 else
 457                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 458                         }
 459                         loc = l;
 460
 461                         if (ReturnType == TypeManager.void_type)
 462                                 ReturnType = null;
 463                 }
 464
 465                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 466                                     Type return_type, int code_flags, bool is_constructor)
 467                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 468                 {
 469                 }
 470
 471                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 472                                     Type return_type, int code_flags)
 473                         : this (tc, tc, l, ig, return_type, code_flags, false)
 474                 {
 475                 }
 476
 477                 public FlowBranching CurrentBranching {
 478                         get {
 479                                 return current_flow_branching;
 480                         }
 481                 }
 482
 483                 public bool HaveCaptureInfo {
 484                         get {
 485                                 return capture_context != null;
 486                         }
 487                 }
 488
 489                 // <summary>
 490                 //   Starts a new code branching.  This inherits the state of all local
 491                 //   variables and parameters from the current branching.
 492                 // </summary>
 493                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 494                 {
 495                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 496                         return current_flow_branching;
 497                 }
 498
 499                 // <summary>
 500                 //   Starts a new code branching for block `block'.
 501                 // </summary>
 502                 public FlowBranching StartFlowBranching (Block block)
 503                 {
 504                         FlowBranching.BranchingType type;
 505
 506                         if (CurrentBranching.Type == FlowBranching.BranchingType.Switch)
 507                                 type = FlowBranching.BranchingType.SwitchSection;
 508                         else
 509                                 type = FlowBranching.BranchingType.Block;
 510
 511                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, block, block.StartLocation);
 512                         return current_flow_branching;
 513                 }
 514
 515                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 516                 {
 517                         FlowBranchingException branching = new FlowBranchingException (
 518                                 CurrentBranching, stmt);
 519                         current_flow_branching = branching;
 520                         return branching;
 521                 }
 522
 523                 // <summary>
 524                 //   Ends a code branching.  Merges the state of locals and parameters
 525                 //   from all the children of the ending branching.
 526                 // </summary>
 527                 public FlowBranching.UsageVector DoEndFlowBranching ()
 528                 {
 529                         FlowBranching old = current_flow_branching;
 530                         current_flow_branching = current_flow_branching.Parent;
 531
 532                         return current_flow_branching.MergeChild (old);
 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.Reachability EndFlowBranching ()
 540                 {
 541                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 542
 543                         return vector.Reachability;
 544                 }
 545
 546                 // <summary>
 547                 //   Kills the current code branching.  This throws away any changed state
 548                 //   information and should only be used in case of an error.
 549                 // </summary>
 550                 public void KillFlowBranching ()
 551                 {
 552                         current_flow_branching = current_flow_branching.Parent;
 553                 }
 554
 555                 public void CaptureVariable (LocalInfo li)
 556                 {
 557                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 558                         li.IsCaptured = true;
 559                 }
 560
 561                 public void CaptureParameter (string name, Type t, int idx)
 562                 {
 563                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 564                 }
 565
 566                 public void CaptureThis ()
 567                 {
 568                         capture_context.CaptureThis ();
 569                 }
 570
 571
 572                 //
 573                 // Use to register a field as captured
 574                 //
 575                 public void CaptureField (FieldExpr fe)
 576                 {
 577                         capture_context.AddField (fe);
 578                 }
 579
 580                 //
 581                 // Whether anonymous methods have captured variables
 582                 //
 583                 public bool HaveCapturedVariables ()
 584                 {
 585                         if (capture_context != null)
 586                                 return capture_context.HaveCapturedVariables;
 587                         return false;
 588                 }
 589
 590                 //
 591                 // Whether anonymous methods have captured fields or this.
 592                 //
 593                 public bool HaveCapturedFields ()
 594                 {
 595                         if (capture_context != null)
 596                                 return capture_context.HaveCapturedFields;
 597                         return false;
 598                 }
 599
 600                 //
 601                 // Emits the instance pointer for the host method
 602                 //
 603                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 604                 {
 605                         if (capture_context != null)
 606                                 capture_context.EmitMethodHostInstance (target, am);
 607                         else if (IsStatic)
 608                                 target.ig.Emit (OpCodes.Ldnull);
 609                         else
 610                                 target.ig.Emit (OpCodes.Ldarg_0);
 611                 }
 612
 613                 //
 614                 // Returns whether the `local' variable has been captured by an anonymous
 615                 // method
 616                 //
 617                 public bool IsCaptured (LocalInfo local)
 618                 {
 619                         return capture_context.IsCaptured (local);
 620                 }
 621
 622                 public bool IsParameterCaptured (string name)
 623                 {
 624                         if (capture_context != null)
 625                                 return capture_context.IsParameterCaptured (name);
 626                         return false;
 627                 }
 628
 629                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 630                 {
 631                         if (capture_context != null)
 632                                 capture_context.EmitAnonymousHelperClasses (this);
 633                         b.EmitMeta (this);
 634
 635                         if (HasReturnLabel)
 636                                 ReturnLabel = ig.DefineLabel ();
 637                 }
 638
 639                 //
 640                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 641                 // currently can not cope with ig == null during resolve (which must
 642                 // be fixed for switch statements to work on anonymous methods).
 643                 //
 644                 public void EmitTopBlock (ToplevelBlock block, InternalParameters ip, Location loc)
 645                 {
 646                         if (block == null)
 647                                 return;
 648
 649                         bool unreachable;
 650
 651                         if (ResolveTopBlock (null, block, ip, loc, out unreachable)){
 652                                 EmitMeta (block, ip);
 653
 654                                 current_phase = Phase.Emitting;
 655                                 EmitResolvedTopBlock (block, unreachable);
 656                         }
 657                 }
 658
 659                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 660                                              InternalParameters ip, Location loc, out bool unreachable)
 661                 {
 662                         current_phase = Phase.Resolving;
 663
 664                         unreachable = false;
 665
 666                         capture_context = block.CaptureContext;
 667
 668                         if (!Location.IsNull (loc))
 669                                 CurrentFile = loc.File;
 670
 671 #if PRODUCTION
 672                         try {
 673 #endif
 674                                 int errors = Report.Errors;
 675
 676                                 block.ResolveMeta (block, this, ip);
 677
 678
 679                                 if (Report.Errors == errors){
 680                                         bool old_do_flow_analysis = DoFlowAnalysis;
 681                                         DoFlowAnalysis = true;
 682
 683                                         if (anonymous_method_host != null)
 684                                                 current_flow_branching = FlowBranching.CreateBranching (
 685                                                 anonymous_method_host.CurrentBranching, FlowBranching.BranchingType.Block,
 686                                                 block, loc);
 687                                         else
 688                                                 current_flow_branching = FlowBranching.CreateBranching (
 689                                                         null, FlowBranching.BranchingType.Block, block, loc);
 690
 691                                         if (!block.Resolve (this)) {
 692                                                 current_flow_branching = null;
 693                                                 DoFlowAnalysis = old_do_flow_analysis;
 694                                                 return false;
 695                                         }
 696
 697                                         FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 698                                         current_flow_branching = null;
 699
 700                                         DoFlowAnalysis = old_do_flow_analysis;
 701
 702                                         if (reachability.AlwaysReturns ||
 703                                             reachability.AlwaysThrows ||
 704                                             reachability.IsUnreachable)
 705                                                 unreachable = true;
 706                                 }
 707 #if PRODUCTION
 708                         } catch (Exception e) {
 709                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 710                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 711
 712                                         if (CurrentBlock != null){
 713                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 714                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 715                                         }
 716                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 717                                         throw;
 718                         }
 719 #endif
 720
 721                         if (ReturnType != null && !unreachable){
 722                                 if (!InIterator){
 723                                         if (CurrentAnonymousMethod != null){
 724                                                 Report.Error (1643, loc, "Not all code paths return a value in anonymous method of type `{0}'",
 725                                                               CurrentAnonymousMethod.Type);
 726                                         } else {
 727                                                 Report.Error (161, loc, "Not all code paths return a value");
 728                                         }
 729
 730                                         return false;
 731                                 }
 732                         }
 733                         block.CompleteContexts ();
 734
 735                         return true;
 736                 }
 737
 738                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 739                 {
 740                         if (block != null)
 741                                 block.Emit (this);
 742
 743                         if (HasReturnLabel)
 744                                 ig.MarkLabel (ReturnLabel);
 745
 746                         if (return_value != null){
 747                                 ig.Emit (OpCodes.Ldloc, return_value);
 748                                 ig.Emit (OpCodes.Ret);
 749                         } else {
 750                                 //
 751                                 // If `HasReturnLabel' is set, then we already emitted a
 752                                 // jump to the end of the method, so we must emit a `ret'
 753                                 // there.
 754                                 //
 755                                 // Unfortunately, System.Reflection.Emit automatically emits
 756                                 // a leave to the end of a finally block.  This is a problem
 757                                 // if no code is following the try/finally block since we may
 758                                 // jump to a point after the end of the method.
 759                                 // As a workaround, we're always creating a return label in
 760                                 // this case.
 761                                 //
 762
 763                                 if ((block != null) && block.IsDestructor) {
 764                                         // Nothing to do; S.R.E automatically emits a leave.
 765                                 } else if (HasReturnLabel || (!unreachable && !InIterator)) {
 766                                         if (ReturnType != null)
 767                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 768                                         ig.Emit (OpCodes.Ret);
 769                                 }
 770                         }
 771
 772                         //
 773                         // Close pending helper classes if we are the toplevel
 774                         //
 775                         if (capture_context != null && capture_context.ParentToplevel == null)
 776                                 capture_context.CloseAnonymousHelperClasses ();
 777                 }
 778
 779                 /// <summary>
 780                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 781                 ///   writer to which source line this opcode belongs.
 782                 /// </summary>
 783                 public void Mark (Location loc, bool check_file)
 784                 {
 785                         if ((CodeGen.SymbolWriter == null) || Location.IsNull (loc))
 786                                 return;
 787
 788                         if (check_file && (CurrentFile != loc.File))
 789                                 return;
 790
 791                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, 0);
 792                 }
 793
 794                 public void DefineLocalVariable (string name, LocalBuilder builder)
 795                 {
 796                         if (CodeGen.SymbolWriter == null)
 797                                 return;
 798
 799                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 800                 }
 801
 802                 public void BeginScope ()
 803                 {
 804                         ig.BeginScope();
 805
 806                         if (CodeGen.SymbolWriter != null)
 807                                 CodeGen.SymbolWriter.OpenScope(ig);
 808                 }
 809
 810                 public void EndScope ()
 811                 {
 812                         ig.EndScope();
 813
 814                         if (CodeGen.SymbolWriter != null)
 815                                 CodeGen.SymbolWriter.CloseScope(ig);
 816                 }
 817
 818                 /// <summary>
 819                 ///   Returns a temporary storage for a variable of type t as
 820                 ///   a local variable in the current body.
 821                 /// </summary>
 822                 public LocalBuilder GetTemporaryLocal (Type t)
 823                 {
 824                         LocalBuilder location = null;
 825
 826                         if (temporary_storage != null){
 827                                 object o = temporary_storage [t];
 828                                 if (o != null){
 829                                         if (o is ArrayList){
 830                                                 ArrayList al = (ArrayList) o;
 831
 832                                                 for (int i = 0; i < al.Count; i++){
 833                                                         if (al [i] != null){
 834                                                                 location = (LocalBuilder) al [i];
 835                                                                 al [i] = null;
 836                                                                 break;
 837                                                         }
 838                                                 }
 839                                         } else
 840                                                 location = (LocalBuilder) o;
 841                                         if (location != null)
 842                                                 return location;
 843                                 }
 844                         }
 845
 846                         return ig.DeclareLocal (t);
 847                 }
 848
 849                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 850                 {
 851                         if (temporary_storage == null){
 852                                 temporary_storage = new Hashtable ();
 853                                 temporary_storage [t] = b;
 854                                 return;
 855                         }
 856                         object o = temporary_storage [t];
 857                         if (o == null){
 858                                 temporary_storage [t] = b;
 859                                 return;
 860                         }
 861                         if (o is ArrayList){
 862                                 ArrayList al = (ArrayList) o;
 863                                 for (int i = 0; i < al.Count; i++){
 864                                         if (al [i] == null){
 865                                                 al [i] = b;
 866                                                 return;
 867                                         }
 868                                 }
 869                                 al.Add (b);
 870                                 return;
 871                         }
 872                         ArrayList replacement = new ArrayList ();
 873                         replacement.Add (o);
 874                         temporary_storage.Remove (t);
 875                         temporary_storage [t] = replacement;
 876                 }
 877
 878                 /// <summary>
 879                 ///   Current loop begin and end labels.
 880                 /// </summary>
 881                 public Label LoopBegin, LoopEnd;
 882
 883                 /// <summary>
 884                 ///   Default target in a switch statement.   Only valid if
 885                 ///   InSwitch is true
 886                 /// </summary>
 887                 public Label DefaultTarget;
 888
 889                 /// <summary>
 890                 ///   If this is non-null, points to the current switch statement
 891                 /// </summary>
 892                 public Switch Switch;
 893
 894                 /// <summary>
 895                 ///   ReturnValue creates on demand the LocalBuilder for the
 896                 ///   return value from the function.  By default this is not
 897                 ///   used.  This is only required when returns are found inside
 898                 ///   Try or Catch statements.
 899                 ///
 900                 ///   This method is typically invoked from the Emit phase, so
 901                 ///   we allow the creation of a return label if it was not
 902                 ///   requested during the resolution phase.   Could be cleaned
 903                 ///   up, but it would replicate a lot of logic in the Emit phase
 904                 ///   of the code that uses it.
 905                 /// </summary>
 906                 public LocalBuilder TemporaryReturn ()
 907                 {
 908                         if (return_value == null){
 909                                 return_value = ig.DeclareLocal (ReturnType);
 910                                 if (!HasReturnLabel){
 911                                         ReturnLabel = ig.DefineLabel ();
 912                                         HasReturnLabel = true;
 913                                 }
 914                         }
 915
 916                         return return_value;
 917                 }
 918
 919                 /// <summary>
 920                 ///   This method is used during the Resolution phase to flag the
 921                 ///   need to define the ReturnLabel
 922                 /// </summary>
 923                 public void NeedReturnLabel ()
 924                 {
 925                         if (current_phase != Phase.Resolving){
 926                                 //
 927                                 // The reason is that the `ReturnLabel' is declared between
 928                                 // resolution and emission
 929                                 //
 930                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 931                         }
 932
 933                         if (!InIterator && !HasReturnLabel)
 934                                 HasReturnLabel = true;
 935                 }
 936
 937                 //
 938                 // Creates a field `name' with the type `t' on the proxy class
 939                 //
 940                 public FieldBuilder MapVariable (string name, Type t)
 941                 {
 942                         if (InIterator)
 943                                 return CurrentIterator.MapVariable ("v_", name, t);
 944
 945                         throw new Exception ("MapVariable for an unknown state");
 946                 }
 947
 948                 public Expression RemapParameter (int idx)
 949                 {
 950                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 951                         fe.InstanceExpression = new ProxyInstance ();
 952                         return fe.DoResolve (this);
 953                 }
 954
 955                 public Expression RemapParameterLValue (int idx, Expression right_side)
 956                 {
 957                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 958                         fe.InstanceExpression = new ProxyInstance ();
 959                         return fe.DoResolveLValue (this, right_side);
 960                 }
 961
 962                 //
 963                 // Emits the proper object to address fields on a remapped
 964                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 965                 //
 966                 public void EmitThis ()
 967                 {
 968                         ig.Emit (OpCodes.Ldarg_0);
 969                         if (InIterator){
 970                                 if (!IsStatic){
 971                                         FieldBuilder this_field = CurrentIterator.this_field.FieldBuilder;
 972                                         if (TypeManager.IsValueType (this_field.FieldType))
 973                                                 ig.Emit (OpCodes.Ldflda, this_field);
 974                                         else
 975                                                 ig.Emit (OpCodes.Ldfld, this_field);
 976                                 }
 977                         } else if (capture_context != null && CurrentAnonymousMethod != null){
 978                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 979                                 while (si != null){
 980                                         if (si.ParentLink != null)
 981                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 982                                         if (si.THIS != null){
 983                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 984                                                 break;
 985                                         }
 986                                         si = si.ParentScope;
 987                                 }
 988                         }
 989                 }
 990
 991                 //
 992                 // Emits the code necessary to load the instance required
 993                 // to access the captured LocalInfo
 994                 //
 995                 public void EmitCapturedVariableInstance (LocalInfo li)
 996                 {
 997                         if (RemapToProxy){
 998                                 ig.Emit (OpCodes.Ldarg_0);
 999                                 return;
1000                         }
1001
1002                         if (capture_context == null)
1003                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
1004
1005                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1006                 }
1007
1008                 public void EmitParameter (string name)
1009                 {
1010                         capture_context.EmitParameter (this, name);
1011                 }
1012
1013                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
1014                 {
1015                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
1016                 }
1017
1018                 public void EmitAddressOfParameter (string name)
1019                 {
1020                         capture_context.EmitAddressOfParameter (this, name);
1021                 }
1022
1023                 public Expression GetThis (Location loc)
1024                 {
1025                         This my_this;
1026                         if (CurrentBlock != null)
1027                                 my_this = new This (CurrentBlock, loc);
1028                         else
1029                                 my_this = new This (loc);
1030
1031                         if (!my_this.ResolveBase (this))
1032                                 my_this = null;
1033
1034                         return my_this;
1035                 }
1036         }
1037
1038
1039         public abstract class CommonAssemblyModulClass: Attributable {
1040                 protected CommonAssemblyModulClass ():
1041                         base (null)
1042                 {
1043                 }
1044
1045                 public void AddAttributes (ArrayList attrs)
1046                 {
1047                         if (OptAttributes == null) {
1048                                 OptAttributes = new Attributes (attrs);
1049                                 return;
1050                         }
1051                         OptAttributes.AddAttributes (attrs);
1052                 }
1053
1054                 public virtual void Emit (TypeContainer tc)
1055                 {
1056                         if (OptAttributes == null)
1057                                 return;
1058
1059                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
1060                         OptAttributes.Emit (ec, this);
1061                 }
1062
1063                 protected Attribute GetClsCompliantAttribute ()
1064                 {
1065                         if (OptAttributes == null)
1066                                 return null;
1067
1068                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1069                         if (!OptAttributes.CheckTargets (this))
1070                                 return null;
1071
1072                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1073                         Attribute a = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, temp_ec);
1074                         if (a != null) {
1075                                 a.Resolve (temp_ec);
1076                         }
1077                         return a;
1078                 }
1079         }
1080
1081         public class AssemblyClass: CommonAssemblyModulClass {
1082                 // TODO: make it private and move all builder based methods here
1083                 public AssemblyBuilder Builder;
1084                 bool is_cls_compliant;
1085                 public Attribute ClsCompliantAttribute;
1086
1087                 ListDictionary declarative_security;
1088
1089                 static string[] attribute_targets = new string [] { "assembly" };
1090
1091                 public AssemblyClass (): base ()
1092                 {
1093                         is_cls_compliant = false;
1094                 }
1095
1096                 public bool IsClsCompliant {
1097                         get {
1098                                 return is_cls_compliant;
1099                         }
1100                 }
1101
1102                 public override AttributeTargets AttributeTargets {
1103                         get {
1104                                 return AttributeTargets.Assembly;
1105                         }
1106                 }
1107
1108                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1109                 {
1110                         return is_cls_compliant;
1111                 }
1112
1113                 public void ResolveClsCompliance ()
1114                 {
1115                         ClsCompliantAttribute = GetClsCompliantAttribute ();
1116                         if (ClsCompliantAttribute == null)
1117                                 return;
1118
1119                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1120                 }
1121
1122                 // fix bug #56621
1123                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1124                 {
1125                         try {
1126                                 // check for possible ECMA key
1127                                 if (strongNameBlob.Length == 16) {
1128                                         // will be rejected if not "the" ECMA key
1129                                         an.SetPublicKey (strongNameBlob);
1130                                 }
1131                                 else {
1132                                         // take it, with or without, a private key
1133                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1134                                         // and make sure we only feed the public part to Sys.Ref
1135                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1136
1137                                         // AssemblyName.SetPublicKey requires an additional header
1138                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1139
1140                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1141                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1142                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1143                                         an.SetPublicKey (encodedPublicKey);
1144                                 }
1145                         }
1146                         catch (Exception) {
1147                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1148                                         RootContext.StrongNameKeyFile + "' incorrectly encoded.");
1149                                 Environment.Exit (1);
1150                         }
1151                 }
1152
1153                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1154                 public AssemblyName GetAssemblyName (string name, string output)
1155                 {
1156                         if (OptAttributes != null) {
1157                                 foreach (Attribute a in OptAttributes.Attrs) {
1158                                         // cannot rely on any resolve-based members before you call Resolve
1159                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1160                                                 continue;
1161
1162                                         // TODO: This code is buggy: comparing Attribute name without resolving it is wrong.
1163                                         //       However, this is invoked by CodeGen.Init, at which time none of the namespaces
1164                                         //       are loaded yet.
1165                                         switch (a.Name) {
1166                                                 case "AssemblyKeyFile":
1167                                                 case "AssemblyKeyFileAttribute":
1168                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1169                                                         if (RootContext.StrongNameKeyFile != null) {
1170                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1171                                                                 Report.Warning (1616, "Compiler option '{0}' overrides '{1}' given in source", "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1172                                                         }
1173                                                         else {
1174                                                                 string value = a.GetString ();
1175                                                                 if (value != String.Empty)
1176                                                                         RootContext.StrongNameKeyFile = value;
1177                                                         }
1178                                                         break;
1179                                                 case "AssemblyKeyName":
1180                                                 case "AssemblyKeyNameAttribute":
1181                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1182                                                         if (RootContext.StrongNameKeyContainer != null) {
1183                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1184                                                                 Report.Warning (1616, "keycontainer", "Compiler option '{0}' overrides '{1}' given in source", "System.Reflection.AssemblyKeyNameAttribute");
1185                                                         }
1186                                                         else {
1187                                                                 string value = a.GetString ();
1188                                                                 if (value != String.Empty)
1189                                                                         RootContext.StrongNameKeyContainer = value;
1190                                                         }
1191                                                         break;
1192                                                 case "AssemblyDelaySign":
1193                                                 case "AssemblyDelaySignAttribute":
1194                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1195                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1196                                                         break;
1197                                         }
1198                                 }
1199                         }
1200
1201                         AssemblyName an = new AssemblyName ();
1202                         an.Name = Path.GetFileNameWithoutExtension (name);
1203
1204                         // note: delay doesn't apply when using a key container
1205                         if (RootContext.StrongNameKeyContainer != null) {
1206                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1207                                 return an;
1208                         }
1209
1210                         // strongname is optional
1211                         if (RootContext.StrongNameKeyFile == null)
1212                                 return an;
1213
1214                         string AssemblyDir = Path.GetDirectoryName (output);
1215
1216                         // the StrongName key file may be relative to (a) the compiled
1217                         // file or (b) to the output assembly. See bugzilla #55320
1218                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1219
1220                         // (a) relative to the compiled file
1221                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1222                         bool exist = File.Exists (filename);
1223                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1224                                 // (b) relative to the outputed assembly
1225                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1226                                 exist = File.Exists (filename);
1227                         }
1228
1229                         if (exist) {
1230                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1231                                         byte[] snkeypair = new byte [fs.Length];
1232                                         fs.Read (snkeypair, 0, snkeypair.Length);
1233
1234                                         if (RootContext.StrongNameDelaySign) {
1235                                                 // delayed signing - DO NOT include private key
1236                                                 SetPublicKey (an, snkeypair);
1237                                         }
1238                                         else {
1239                                                 // no delay so we make sure we have the private key
1240                                                 try {
1241                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1242                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1243                                                 }
1244                                                 catch (CryptographicException) {
1245                                                         if (snkeypair.Length == 16) {
1246                                                                 // error # is different for ECMA key
1247                                                                 Report.Error (1606, "Could not strongname the assembly. " +
1248                                                                         "ECMA key can only be used to delay-sign assemblies");
1249                                                         }
1250                                                         else {
1251                                                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1252                                                                         RootContext.StrongNameKeyFile +
1253                                                                         "' doesn't have a private key.");
1254                                                         }
1255                                                         Environment.Exit (1);
1256                                                 }
1257                                         }
1258                                 }
1259                         }
1260                         else {
1261                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1262                                         RootContext.StrongNameKeyFile + "' not found.");
1263                                 Environment.Exit (1);
1264                         }
1265                         return an;
1266                 }
1267
1268                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1269                 {
1270                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1271                                 if (declarative_security == null)
1272                                         declarative_security = new ListDictionary ();
1273
1274                                 a.ExtractSecurityPermissionSet (declarative_security);
1275                                 return;
1276                         }
1277
1278                         Builder.SetCustomAttribute (customBuilder);
1279                 }
1280
1281                 public override void Emit (TypeContainer tc)
1282                 {
1283                         base.Emit (tc);
1284
1285                         if (declarative_security != null) {
1286
1287                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1288                                 object builder_instance = Builder;
1289
1290                                 try {
1291                                         // Microsoft runtime hacking
1292                                         if (add_permission == null) {
1293                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1294                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1295
1296                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1297                                                 builder_instance = fi.GetValue (Builder);
1298                                         }
1299
1300                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1301                                                                                                   declarative_security [SecurityAction.RequestOptional],
1302                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1303                                         add_permission.Invoke (builder_instance, args);
1304                                 }
1305                                 catch {
1306                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1307                                 }
1308                         }
1309                 }
1310
1311                 public override string[] ValidAttributeTargets {
1312                         get {
1313                                 return attribute_targets;
1314                         }
1315                 }
1316         }
1317
1318         public class ModuleClass: CommonAssemblyModulClass {
1319                 // TODO: make it private and move all builder based methods here
1320                 public ModuleBuilder Builder;
1321                 bool m_module_is_unsafe;
1322
1323                 static string[] attribute_targets = new string [] { "module" };
1324
1325                 public ModuleClass (bool is_unsafe)
1326                 {
1327                         m_module_is_unsafe = is_unsafe;
1328                 }
1329
1330                 public override AttributeTargets AttributeTargets {
1331                         get {
1332                                 return AttributeTargets.Module;
1333                         }
1334                 }
1335
1336                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1337                 {
1338                         return CodeGen.Assembly.IsClsCompliant;
1339                 }
1340
1341                 public override void Emit (TypeContainer tc)
1342                 {
1343                         base.Emit (tc);
1344
1345                         if (!m_module_is_unsafe)
1346                                 return;
1347
1348                         if (TypeManager.unverifiable_code_ctor == null) {
1349                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1350                                 return;
1351                         }
1352
1353                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1354                 }
1355
1356                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1357                 {
1358                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1359                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1360                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1361                                 }
1362                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1363                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.Name);
1364                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1365                                         return;
1366                                 }
1367                         }
1368
1369                         Builder.SetCustomAttribute (customBuilder);
1370                 }
1371
1372                 public override string[] ValidAttributeTargets {
1373                         get {
1374                                 return attribute_targets;
1375                         }
1376                 }
1377         }
1378 }