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