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 416                 /// Trace when method is called and is obsolete then this member suppress message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