mcs/gmcs/codegen.cs

   1 //
   2 // codegen.cs: The code generator
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) 2001, 2002, 2003 Ximian, Inc.
   8 // (C) 2004 Novell, Inc.
   9 //
  10 //#define PRODUCTION
  11 using System;
  12 using System.IO;
  13 using System.Collections;
  14 using System.Collections.Specialized;
  15 using System.Reflection;
  16 using System.Reflection.Emit;
  17 using System.Runtime.InteropServices;
  18 using System.Security;
  19 using System.Security.Cryptography;
  20 using System.Security.Permissions;
  21
  22 using Mono.Security.Cryptography;
  23
  24 namespace Mono.CSharp {
  25
  26         /// <summary>
  27         ///    Code generator class.
  28         /// </summary>
  29         public class CodeGen {
  30                 static AppDomain current_domain;
  31                 static public SymbolWriter SymbolWriter;
  32
  33                 public static AssemblyClass Assembly;
  34                 public static ModuleClass Module;
  35
  36                 static CodeGen ()
  37                 {
  38                         Assembly = new AssemblyClass ();
  39                         Module = new ModuleClass (RootContext.Unsafe);
  40                 }
  41
  42                 public static string Basename (string name)
  43                 {
  44                         int pos = name.LastIndexOf ('/');
  45
  46                         if (pos != -1)
  47                                 return name.Substring (pos + 1);
  48
  49                         pos = name.LastIndexOf ('\\');
  50                         if (pos != -1)
  51                                 return name.Substring (pos + 1);
  52
  53                         return name;
  54                 }
  55
  56                 public static string Dirname (string name)
  57                 {
  58                         int pos = name.LastIndexOf ('/');
  59
  60                         if (pos != -1)
  61                                 return name.Substring (0, pos);
  62
  63                         pos = name.LastIndexOf ('\\');
  64                         if (pos != -1)
  65                                 return name.Substring (0, pos);
  66
  67                         return ".";
  68                 }
  69
  70                 static string TrimExt (string name)
  71                 {
  72                         int pos = name.LastIndexOf ('.');
  73
  74                         return name.Substring (0, pos);
  75                 }
  76
  77                 static public string FileName;
  78
  79                 //
  80                 // Initializes the symbol writer
  81                 //
  82                 static void InitializeSymbolWriter (string filename)
  83                 {
  84                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  85
  86                         //
  87                         // If we got an ISymbolWriter instance, initialize it.
  88                         //
  89                         if (SymbolWriter == null) {
  90                                 Report.Warning (
  91                                         -18, "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll). This is normally an installation problem. Please make sure to compile and install the mcs/class/Mono.CompilerServices.SymbolWriter directory.");
  92                                 return;
  93                         }
  94                 }
  95
  96                 //
  97                 // Initializes the code generator variables
  98                 //
  99                 static public void Init (string name, string output, bool want_debugging_support)
 100                 {
 101                         FileName = output;
 102                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 103
 104                         if (an.KeyPair != null) {
 105                                 // If we are going to strong name our assembly make
 106                                 // sure all its refs are strong named
 107                                 foreach (Assembly a in TypeManager.GetAssemblies ()) {
 108                                         AssemblyName ref_name = a.GetName ();
 109                                         byte [] b = ref_name.GetPublicKeyToken ();
 110                                         if (b == null || b.Length == 0) {
 111                                                 Report.Warning (1577, "Assembly generation failed " +
 112                                                                 "-- Referenced assembly '" +
 113                                                                 ref_name.Name +
 114                                                                 "' does not have a strong name.");
 115                                                 //Environment.Exit (1);
 116                                         }
 117                                 }
 118                         }
 119
 120                         current_domain = AppDomain.CurrentDomain;
 121
 122                         try {
 123                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 124                                         AssemblyBuilderAccess.Save, Dirname (name));
 125                         }
 126                         catch (ArgumentException) {
 127                                 // specified key may not be exportable outside it's container
 128                                 if (RootContext.StrongNameKeyContainer != null) {
 129                                         Report.Error (1548, "Could not access the key inside the container `" +
 130                                                 RootContext.StrongNameKeyContainer + "'.");
 131                                         Environment.Exit (1);
 132                                 }
 133                                 throw;
 134                         }
 135                         catch (CryptographicException) {
 136                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 137                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 138                                         Environment.Exit (1);
 139                                 }
 140                                 throw;
 141                         }
 142
 143                         //
 144                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 145                         // this copes with output in different directories then.
 146                         // FIXME: figure out how this copes with --output /tmp/blah
 147                         //
 148                         // If the third argument is true, the ModuleBuilder will dynamically
 149                         // load the default symbol writer.
 150                         //
 151                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 152                                 Basename (name), Basename (output), false);
 153
 154                         if (want_debugging_support)
 155                                 InitializeSymbolWriter (output);
 156                 }
 157
 158                 static public void Save (string name)
 159                 {
 160                         try {
 161                                 Assembly.Builder.Save (Basename (name));
 162                         }
 163                         catch (COMException) {
 164                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 165                                         throw;
 166
 167                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 168                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 169                                         RootContext.StrongNameKeyFile +
 170                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 171                         }
 172                         catch (System.IO.IOException io) {
 173                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 174                         }
 175
 176                         if (SymbolWriter != null)
 177                                 SymbolWriter.WriteSymbolFile ();
 178                 }
 179         }
 180
 181         //
 182         // Provides "local" store across code that can yield: locals
 183         // or fields, notice that this should not be used by anonymous
 184         // methods to create local storage, those only require
 185         // variable mapping.
 186         //
 187         public class VariableStorage {
 188                 FieldBuilder fb;
 189                 LocalBuilder local;
 190
 191                 static int count;
 192
 193                 public VariableStorage (EmitContext ec, Type t)
 194                 {
 195                         count++;
 196                         if (ec.InIterator)
 197                                 fb = ec.CurrentIterator.MapVariable ("s_", count.ToString (), t);
 198                         else
 199                                 local = ec.ig.DeclareLocal (t);
 200                 }
 201
 202                 public void EmitThis (ILGenerator ig)
 203                 {
 204                         if (fb != null)
 205                                 ig.Emit (OpCodes.Ldarg_0);
 206                 }
 207
 208                 public void EmitStore (ILGenerator ig)
 209                 {
 210                         if (fb == null)
 211                                 ig.Emit (OpCodes.Stloc, local);
 212                         else
 213                                 ig.Emit (OpCodes.Stfld, fb);
 214                 }
 215
 216                 public void EmitLoad (ILGenerator ig)
 217                 {
 218                         if (fb == null)
 219                                 ig.Emit (OpCodes.Ldloc, local);
 220                         else
 221                                 ig.Emit (OpCodes.Ldfld, fb);
 222                 }
 223
 224                 public void EmitLoadAddress (ILGenerator ig)
 225                 {
 226                         if (fb == null)
 227                                 ig.Emit (OpCodes.Ldloca, local);
 228                         else
 229                                 ig.Emit (OpCodes.Ldflda, fb);
 230                 }
 231
 232                 public void EmitCall (ILGenerator ig, MethodInfo mi)
 233                 {
 234                         // FIXME : we should handle a call like tostring
 235                         // here, where boxing is needed. However, we will
 236                         // never encounter that with the current usage.
 237
 238                         bool value_type_call;
 239                         EmitThis (ig);
 240                         if (fb == null) {
 241                                 value_type_call = local.LocalType.IsValueType;
 242
 243                                 if (value_type_call)
 244                                         ig.Emit (OpCodes.Ldloca, local);
 245                                 else
 246                                         ig.Emit (OpCodes.Ldloc, local);
 247                         } else {
 248                                 value_type_call = fb.FieldType.IsValueType;
 249
 250                                 if (value_type_call)
 251                                         ig.Emit (OpCodes.Ldflda, fb);
 252                                 else
 253                                         ig.Emit (OpCodes.Ldfld, fb);
 254                         }
 255
 256                         ig.Emit (value_type_call ? OpCodes.Call : OpCodes.Callvirt, mi);
 257                 }
 258         }
 259
 260         /// <summary>
 261         ///   An Emit Context is created for each body of code (from methods,
 262         ///   properties bodies, indexer bodies or constructor bodies)
 263         /// </summary>
 264         public class EmitContext {
 265                 public DeclSpace DeclSpace;
 266                 public DeclSpace TypeContainer;
 267                 public ILGenerator   ig;
 268
 269                 /// <summary>
 270                 ///   This variable tracks the `checked' state of the compilation,
 271                 ///   it controls whether we should generate code that does overflow
 272                 ///   checking, or if we generate code that ignores overflows.
 273                 ///
 274                 ///   The default setting comes from the command line option to generate
 275                 ///   checked or unchecked code plus any source code changes using the
 276                 ///   checked/unchecked statements or expressions.   Contrast this with
 277                 ///   the ConstantCheckState flag.
 278                 /// </summary>
 279
 280                 public bool CheckState;
 281
 282                 /// <summary>
 283                 ///   The constant check state is always set to `true' and cant be changed
 284                 ///   from the command line.  The source code can change this setting with
 285                 ///   the `checked' and `unchecked' statements and expressions.
 286                 /// </summary>
 287                 public bool ConstantCheckState;
 288
 289                 /// <summary>
 290                 ///   Whether we are emitting code inside a static or instance method
 291                 /// </summary>
 292                 public bool IsStatic;
 293
 294                 /// <summary>
 295                 ///   Whether 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                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 440                                 throw new Exception ("FUCK");
 441
 442                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 443                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 444                         RemapToProxy = InIterator;
 445                         ReturnType = return_type;
 446                         IsConstructor = is_constructor;
 447                         CurrentBlock = null;
 448                         CurrentFile = 0;
 449                         current_phase = Phase.Created;
 450
 451                         if (parent != null){
 452                                 // Can only be null for the ResolveType contexts.
 453                                 ContainerType = parent.TypeBuilder;
 454                                 if (parent.UnsafeContext)
 455                                         InUnsafe = true;
 456                                 else
 457                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 458                         }
 459                         loc = l;
 460
 461                         if (ReturnType == TypeManager.void_type)
 462                                 ReturnType = null;
 463                 }
 464
 465                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 466                                     Type return_type, int code_flags, bool is_constructor)
 467                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 468                 {
 469                 }
 470
 471                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 472                                     Type return_type, int code_flags)
 473                         : this (tc, tc, l, ig, return_type, code_flags, false)
 474                 {
 475                 }
 476
 477                 public FlowBranching CurrentBranching {
 478                         get {
 479                                 return current_flow_branching;
 480                         }
 481                 }
 482
 483                 public bool HaveCaptureInfo {
 484                         get {
 485                                 return capture_context != null;
 486                         }
 487                 }
 488
 489                 // <summary>
 490                 //   Starts a new code branching.  This inherits the state of all local
 491                 //   variables and parameters from the current branching.
 492                 // </summary>
 493                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 494                 {
 495                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 496                         return current_flow_branching;
 497                 }
 498
 499                 // <summary>
 500                 //   Starts a new code branching for block `block'.
 501                 // </summary>
 502                 public FlowBranching StartFlowBranching (Block block)
 503                 {
 504                         FlowBranching.BranchingType type;
 505
 506                         if (CurrentBranching.Type == FlowBranching.BranchingType.Switch)
 507                                 type = FlowBranching.BranchingType.SwitchSection;
 508                         else
 509                                 type = FlowBranching.BranchingType.Block;
 510
 511                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, block, block.StartLocation);
 512                         return current_flow_branching;
 513                 }
 514
 515                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 516                 {
 517                         FlowBranchingException branching = new FlowBranchingException (
 518                                 CurrentBranching, stmt);
 519                         current_flow_branching = branching;
 520                         return branching;
 521                 }
 522
 523                 // <summary>
 524                 //   Ends a code branching.  Merges the state of locals and parameters
 525                 //   from all the children of the ending branching.
 526                 // </summary>
 527                 public FlowBranching.UsageVector DoEndFlowBranching ()
 528                 {
 529                         FlowBranching old = current_flow_branching;
 530                         current_flow_branching = current_flow_branching.Parent;
 531
 532                         return current_flow_branching.MergeChild (old);
 533                 }
 534
 535                 // <summary>
 536                 //   Ends a code branching.  Merges the state of locals and parameters
 537                 //   from all the children of the ending branching.
 538                 // </summary>
 539                 public FlowBranching.Reachability EndFlowBranching ()
 540                 {
 541                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 542
 543                         return vector.Reachability;
 544                 }
 545
 546                 // <summary>
 547                 //   Kills the current code branching.  This throws away any changed state
 548                 //   information and should only be used in case of an error.
 549                 // </summary>
 550                 public void KillFlowBranching ()
 551                 {
 552                         current_flow_branching = current_flow_branching.Parent;
 553                 }
 554
 555                 public void CaptureVariable (LocalInfo li)
 556                 {
 557                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 558                         li.IsCaptured = true;
 559                 }
 560
 561                 public void CaptureParameter (string name, Type t, int idx)
 562                 {
 563
 564                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 565                 }
 566
 567                 //
 568                 // Use to register a field as captured
 569                 //
 570                 public void CaptureField (FieldExpr fe)
 571                 {
 572                         capture_context.AddField (fe);
 573                 }
 574
 575                 //
 576                 // Whether anonymous methods have captured variables
 577                 //
 578                 public bool HaveCapturedVariables ()
 579                 {
 580                         if (capture_context != null)
 581                                 return capture_context.HaveCapturedVariables;
 582                         return false;
 583                 }
 584
 585                 //
 586                 // Whether anonymous methods have captured fields or this.
 587                 //
 588                 public bool HaveCapturedFields ()
 589                 {
 590                         if (capture_context != null)
 591                                 return capture_context.HaveCapturedFields;
 592                         return false;
 593                 }
 594
 595                 //
 596                 // Emits the instance pointer for the host method
 597                 //
 598                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 599                 {
 600                         if (capture_context != null)
 601                                 capture_context.EmitMethodHostInstance (target, am);
 602                         else if (IsStatic)
 603                                 target.ig.Emit (OpCodes.Ldnull);
 604                         else
 605                                 target.ig.Emit (OpCodes.Ldarg_0);
 606                 }
 607
 608                 //
 609                 // Returns whether the `local' variable has been captured by an anonymous
 610                 // method
 611                 //
 612                 public bool IsCaptured (LocalInfo local)
 613                 {
 614                         return capture_context.IsCaptured (local);
 615                 }
 616
 617                 public bool IsParameterCaptured (string name)
 618                 {
 619                         if (capture_context != null)
 620                                 return capture_context.IsParameterCaptured (name);
 621                         return false;
 622                 }
 623
 624                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 625                 {
 626                         if (capture_context != null)
 627                                 capture_context.EmitHelperClasses (this);
 628                         b.EmitMeta (this);
 629
 630                         if (HasReturnLabel)
 631                                 ReturnLabel = ig.DefineLabel ();
 632                 }
 633
 634                 //
 635                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 636                 // currently can not cope with ig == null during resolve (which must
 637                 // be fixed for switch statements to work on anonymous methods).
 638                 //
 639                 public void EmitTopBlock (ToplevelBlock block, InternalParameters ip, Location loc)
 640                 {
 641                         if (block == null)
 642                                 return;
 643
 644                         bool unreachable;
 645
 646                         if (ResolveTopBlock (null, block, ip, loc, out unreachable)){
 647                                 EmitMeta (block, ip);
 648
 649                                 current_phase = Phase.Emitting;
 650                                 EmitResolvedTopBlock (block, unreachable);
 651                         }
 652                 }
 653
 654                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 655                                              InternalParameters ip, Location loc, out bool unreachable)
 656                 {
 657                         current_phase = Phase.Resolving;
 658
 659                         unreachable = false;
 660
 661                         capture_context = block.CaptureContext;
 662
 663                         if (!Location.IsNull (loc))
 664                                 CurrentFile = loc.File;
 665
 666 #if PRODUCTION
 667                             try {
 668 #endif
 669                                 int errors = Report.Errors;
 670
 671                                 block.ResolveMeta (block, this, ip);
 672
 673
 674                                 if (Report.Errors == errors){
 675                                         bool old_do_flow_analysis = DoFlowAnalysis;
 676                                         DoFlowAnalysis = true;
 677
 678                                         if (anonymous_method_host != null)
 679                                                 current_flow_branching = FlowBranching.CreateBranching (
 680                                                 anonymous_method_host.CurrentBranching, FlowBranching.BranchingType.Block,
 681                                                 block, loc);
 682                                         else
 683                                         current_flow_branching = FlowBranching.CreateBranching (
 684                                                 null, FlowBranching.BranchingType.Block, block, loc);
 685
 686                                         if (!block.Resolve (this)) {
 687                                                 current_flow_branching = null;
 688                                                 DoFlowAnalysis = old_do_flow_analysis;
 689                                                 return false;
 690                                         }
 691
 692                                         FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 693                                         current_flow_branching = null;
 694
 695                                         DoFlowAnalysis = old_do_flow_analysis;
 696
 697                                         if (reachability.AlwaysReturns ||
 698                                             reachability.AlwaysThrows ||
 699                                             reachability.IsUnreachable)
 700                                                 unreachable = true;
 701                                         }
 702 #if PRODUCTION
 703                             } catch (Exception e) {
 704                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 705                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 706
 707                                         if (CurrentBlock != null){
 708                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 709                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 710                                         }
 711                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 712                                 throw;
 713                         }
 714 #endif
 715
 716                         if (ReturnType != null && !unreachable){
 717                                 if (!InIterator){
 718                                         if (CurrentAnonymousMethod != null){
 719                                                 Report.Error (1643, loc, "Not all code paths return a value in anonymous method of type `{0}'",
 720                                                               CurrentAnonymousMethod.Type);
 721                                         } else {
 722                                         Report.Error (161, loc, "Not all code paths return a value");
 723                                         }
 724
 725                                         return false;
 726                                 }
 727                         }
 728                         block.CompleteContexts ();
 729
 730                         return true;
 731                 }
 732
 733                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 734                 {
 735                         if (block != null)
 736                                 block.Emit (this);
 737
 738                         if (HasReturnLabel)
 739                                 ig.MarkLabel (ReturnLabel);
 740
 741                         if (return_value != null){
 742                                 ig.Emit (OpCodes.Ldloc, return_value);
 743                                 ig.Emit (OpCodes.Ret);
 744                         } else {
 745                                 //
 746                                 // If `HasReturnLabel' is set, then we already emitted a
 747                                 // jump to the end of the method, so we must emit a `ret'
 748                                 // there.
 749                                 //
 750                                 // Unfortunately, System.Reflection.Emit automatically emits
 751                                 // a leave to the end of a finally block.  This is a problem
 752                                 // if no code is following the try/finally block since we may
 753                                 // jump to a point after the end of the method.
 754                                 // As a workaround, we're always creating a return label in
 755                                 // this case.
 756                                 //
 757
 758                                 if ((block != null) && block.IsDestructor) {
 759                                         // Nothing to do; S.R.E automatically emits a leave.
 760                                 } else if (HasReturnLabel || (!unreachable && !InIterator)) {
 761                                         if (ReturnType != null)
 762                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 763                                         ig.Emit (OpCodes.Ret);
 764                                 }
 765                         }
 766
 767                         //
 768                         // Close pending helper classes if we are the toplevel
 769                         //
 770                         if (capture_context != null && capture_context.ParentToplevel == null)
 771                                 capture_context.CloseHelperClasses ();
 772                 }
 773
 774                 /// <summary>
 775                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 776                 ///   writer to which source line this opcode belongs.
 777                 /// </summary>
 778                 public void Mark (Location loc, bool check_file)
 779                 {
 780                         if ((CodeGen.SymbolWriter == null) || Location.IsNull (loc))
 781                                 return;
 782
 783                         if (check_file && (CurrentFile != loc.File))
 784                                 return;
 785
 786                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, 0);
 787                 }
 788
 789                 public void DefineLocalVariable (string name, LocalBuilder builder)
 790                 {
 791                         if (CodeGen.SymbolWriter == null)
 792                                 return;
 793
 794                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 795                 }
 796
 797                 /// <summary>
 798                 ///   Returns a temporary storage for a variable of type t as
 799                 ///   a local variable in the current body.
 800                 /// </summary>
 801                 public LocalBuilder GetTemporaryLocal (Type t)
 802                 {
 803                         LocalBuilder location = null;
 804
 805                         if (temporary_storage != null){
 806                                 object o = temporary_storage [t];
 807                                 if (o != null){
 808                                         if (o is ArrayList){
 809                                                 ArrayList al = (ArrayList) o;
 810
 811                                                 for (int i = 0; i < al.Count; i++){
 812                                                         if (al [i] != null){
 813                                                                 location = (LocalBuilder) al [i];
 814                                                                 al [i] = null;
 815                                                                 break;
 816                                                         }
 817                                                 }
 818                                         } else
 819                                                 location = (LocalBuilder) o;
 820                                         if (location != null)
 821                                                 return location;
 822                                 }
 823                         }
 824
 825                         return ig.DeclareLocal (t);
 826                 }
 827
 828                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 829                 {
 830                         if (temporary_storage == null){
 831                                 temporary_storage = new Hashtable ();
 832                                 temporary_storage [t] = b;
 833                                 return;
 834                         }
 835                         object o = temporary_storage [t];
 836                         if (o == null){
 837                                 temporary_storage [t] = b;
 838                                 return;
 839                         }
 840                         if (o is ArrayList){
 841                                 ArrayList al = (ArrayList) o;
 842                                 for (int i = 0; i < al.Count; i++){
 843                                         if (al [i] == null){
 844                                                 al [i] = b;
 845                                                 return;
 846                                         }
 847                                 }
 848                                 al.Add (b);
 849                                 return;
 850                         }
 851                         ArrayList replacement = new ArrayList ();
 852                         replacement.Add (o);
 853                         temporary_storage.Remove (t);
 854                         temporary_storage [t] = replacement;
 855                 }
 856
 857                 /// <summary>
 858                 ///   Current loop begin and end labels.
 859                 /// </summary>
 860                 public Label LoopBegin, LoopEnd;
 861
 862                 /// <summary>
 863                 ///   Default target in a switch statement.   Only valid if
 864                 ///   InSwitch is true
 865                 /// </summary>
 866                 public Label DefaultTarget;
 867
 868                 /// <summary>
 869                 ///   If this is non-null, points to the current switch statement
 870                 /// </summary>
 871                 public Switch Switch;
 872
 873                 /// <summary>
 874                 ///   ReturnValue creates on demand the LocalBuilder for the
 875                 ///   return value from the function.  By default this is not
 876                 ///   used.  This is only required when returns are found inside
 877                 ///   Try or Catch statements.
 878                 ///
 879                 ///   This method is typically invoked from the Emit phase, so
 880                 ///   we allow the creation of a return label if it was not
 881                 ///   requested during the resolution phase.   Could be cleaned
 882                 ///   up, but it would replicate a lot of logic in the Emit phase
 883                 ///   of the code that uses it.
 884                 /// </summary>
 885                 public LocalBuilder TemporaryReturn ()
 886                 {
 887                         if (return_value == null){
 888                                 return_value = ig.DeclareLocal (ReturnType);
 889                                 if (!HasReturnLabel){
 890                                 ReturnLabel = ig.DefineLabel ();
 891                                 HasReturnLabel = true;
 892                         }
 893                         }
 894
 895                         return return_value;
 896                 }
 897
 898                 /// <summary>
 899                 ///   This method is used during the Resolution phase to flag the
 900                 ///   need to define the ReturnLabel
 901                 /// </summary>
 902                 public void NeedReturnLabel ()
 903                 {
 904                         if (current_phase != Phase.Resolving){
 905                                 //
 906                                 // The reason is that the `ReturnLabel' is declared between
 907                                 // resolution and emission
 908                                 //
 909                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 910                         }
 911
 912                         if (!InIterator && !HasReturnLabel)
 913                                 HasReturnLabel = true;
 914                         }
 915
 916                 //
 917                 // Creates a field `name' with the type `t' on the proxy class
 918                 //
 919                 public FieldBuilder MapVariable (string name, Type t)
 920                 {
 921                         if (InIterator)
 922                                 return CurrentIterator.MapVariable ("v_", name, t);
 923
 924                         throw new Exception ("MapVariable for an unknown state");
 925                 }
 926
 927                 public Expression RemapParameter (int idx)
 928                 {
 929                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 930                         fe.InstanceExpression = new ProxyInstance ();
 931                         return fe.DoResolve (this);
 932                 }
 933
 934                 public Expression RemapParameterLValue (int idx, Expression right_side)
 935                 {
 936                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 937                         fe.InstanceExpression = new ProxyInstance ();
 938                         return fe.DoResolveLValue (this, right_side);
 939                 }
 940
 941                 //
 942                 // Emits the proper object to address fields on a remapped
 943                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 944                 //
 945                 public void EmitThis ()
 946                 {
 947                         ig.Emit (OpCodes.Ldarg_0);
 948                         if (InIterator){
 949                                 if (!IsStatic){
 950                                 FieldBuilder this_field = CurrentIterator.this_field.FieldBuilder;
 951                                 if (TypeManager.IsValueType (this_field.FieldType))
 952                                         ig.Emit (OpCodes.Ldflda, this_field);
 953                                 else
 954                                         ig.Emit (OpCodes.Ldfld, this_field);
 955                         }
 956                         } else if (capture_context != null && CurrentAnonymousMethod != null){
 957                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 958                                 while (si != null){
 959                                         if (si.ParentLink != null)
 960                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 961                                         if (si.THIS != null){
 962                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 963                                                 break;
 964                                         }
 965                                         si = si.ParentScope;
 966                                 }
 967                         }
 968                 }
 969
 970                 //
 971                 // Emits the code necessary to load the instance required
 972                 // to access the captured LocalInfo
 973                 //
 974                 public void EmitCapturedVariableInstance (LocalInfo li)
 975                 {
 976                         if (RemapToProxy){
 977                                 ig.Emit (OpCodes.Ldarg_0);
 978                                 return;
 979                         }
 980
 981                         if (capture_context == null)
 982                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
 983
 984                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
 985                 }
 986
 987                 public void EmitParameter (string name)
 988                 {
 989                         capture_context.EmitParameter (this, name);
 990                 }
 991
 992                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
 993                 {
 994                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
 995                 }
 996
 997                 public void EmitAddressOfParameter (string name)
 998                 {
 999                         capture_context.EmitAddressOfParameter (this, name);
1000                 }
1001
1002                 public Expression GetThis (Location loc)
1003                 {
1004                         This my_this;
1005                         if (CurrentBlock != null)
1006                                 my_this = new This (CurrentBlock, loc);
1007                         else
1008                                 my_this = new This (loc);
1009
1010                         if (!my_this.ResolveBase (this))
1011                                 my_this = null;
1012
1013                         return my_this;
1014                 }
1015         }
1016
1017
1018         public abstract class CommonAssemblyModulClass: Attributable {
1019                 protected CommonAssemblyModulClass ():
1020                         base (null)
1021                 {
1022                 }
1023
1024                 public void AddAttributes (ArrayList attrs)
1025                 {
1026                         if (OptAttributes == null) {
1027                                 OptAttributes = new Attributes (attrs);
1028                                 return;
1029                         }
1030                         OptAttributes.AddAttributes (attrs);
1031                 }
1032
1033                 public virtual void Emit (TypeContainer tc)
1034                 {
1035                         if (OptAttributes == null)
1036                                 return;
1037
1038                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
1039                         OptAttributes.Emit (ec, this);
1040                 }
1041
1042                 protected Attribute GetClsCompliantAttribute ()
1043                 {
1044                         if (OptAttributes == null)
1045                                 return null;
1046
1047                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1048                         if (!OptAttributes.CheckTargets (this))
1049                                 return null;
1050
1051                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1052                         Attribute a = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, temp_ec);
1053                         if (a != null) {
1054                                 a.Resolve (temp_ec);
1055                         }
1056                         return a;
1057                 }
1058         }
1059
1060         public class AssemblyClass: CommonAssemblyModulClass {
1061                 // TODO: make it private and move all builder based methods here
1062                 public AssemblyBuilder Builder;
1063
1064                 bool is_cls_compliant;
1065                 public Attribute ClsCompliantAttribute;
1066
1067                 ListDictionary declarative_security;
1068
1069                 static string[] attribute_targets = new string [] { "assembly" };
1070
1071                 public AssemblyClass (): base ()
1072                 {
1073                         is_cls_compliant = false;
1074                 }
1075
1076                 public bool IsClsCompliant {
1077                         get {
1078                                 return is_cls_compliant;
1079                         }
1080                         }
1081
1082                 public override AttributeTargets AttributeTargets {
1083                         get {
1084                                 return AttributeTargets.Assembly;
1085                         }
1086                 }
1087
1088                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1089                 {
1090                         return is_cls_compliant;
1091                 }
1092
1093                 public void ResolveClsCompliance ()
1094                 {
1095                         ClsCompliantAttribute = GetClsCompliantAttribute ();
1096                         if (ClsCompliantAttribute == null)
1097                                 return;
1098
1099                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1100                 }
1101
1102                 // fix bug #56621
1103                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1104                 {
1105                         try {
1106                                 // check for possible ECMA key
1107                                 if (strongNameBlob.Length == 16) {
1108                                         // will be rejected if not "the" ECMA key
1109                                         an.SetPublicKey (strongNameBlob);
1110                                 }
1111                                 else {
1112                                         // take it, with or without, a private key
1113                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1114                                         // and make sure we only feed the public part to Sys.Ref
1115                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1116
1117                                         // AssemblyName.SetPublicKey requires an additional header
1118                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1119
1120                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1121                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1122                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1123                                         an.SetPublicKey (encodedPublicKey);
1124                                 }
1125                         }
1126                         catch (Exception) {
1127                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1128                                         RootContext.StrongNameKeyFile + "' incorrectly encoded.");
1129                                 Environment.Exit (1);
1130                         }
1131                 }
1132
1133                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1134                 public AssemblyName GetAssemblyName (string name, string output)
1135                 {
1136                         if (OptAttributes != null) {
1137                                foreach (Attribute a in OptAttributes.Attrs) {
1138                                        // cannot rely on any resolve-based members before you call Resolve
1139                                        if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1140                                                continue;
1141
1142                                        // TODO: This code is buggy: comparing Attribute name without resolving it is wrong.
1143                                        //       However, this is invoked by CodeGen.Init, at which time none of the namespaces
1144                                        //       are loaded yet.
1145                                         switch (a.Name) {
1146                                                 case "AssemblyKeyFile":
1147                                                case "AssemblyKeyFileAttribute":
1148                                                case "System.Reflection.AssemblyKeyFileAttribute":
1149                                                         if (RootContext.StrongNameKeyFile != null) {
1150                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1151                                                                 Report.Warning (1616, "Compiler option '{0}' overrides '{1}' given in source", "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1152                                                         }
1153                                                         else {
1154                                                                 string value = a.GetString ();
1155                                                                 if (value != String.Empty)
1156                                                                         RootContext.StrongNameKeyFile = value;
1157                                                         }
1158                                                         break;
1159                                                 case "AssemblyKeyName":
1160                                                case "AssemblyKeyNameAttribute":
1161                                                case "System.Reflection.AssemblyKeyNameAttribute":
1162                                                         if (RootContext.StrongNameKeyContainer != null) {
1163                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1164                                                                 Report.Warning (1616, "keycontainer", "Compiler option '{0}' overrides '{1}' given in source", "System.Reflection.AssemblyKeyNameAttribute");
1165                                                         }
1166                                                         else {
1167                                                                 string value = a.GetString ();
1168                                                                 if (value != String.Empty)
1169                                                                         RootContext.StrongNameKeyContainer = value;
1170                                                         }
1171                                                         break;
1172                                                 case "AssemblyDelaySign":
1173                                                case "AssemblyDelaySignAttribute":
1174                                                case "System.Reflection.AssemblyDelaySignAttribute":
1175                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1176                                                         break;
1177                                         }
1178                                 }
1179                         }
1180
1181                         AssemblyName an = new AssemblyName ();
1182                         an.Name = Path.GetFileNameWithoutExtension (name);
1183
1184                         // note: delay doesn't apply when using a key container
1185                         if (RootContext.StrongNameKeyContainer != null) {
1186                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1187                                 return an;
1188                         }
1189
1190                         // strongname is optional
1191                         if (RootContext.StrongNameKeyFile == null)
1192                                 return an;
1193
1194                         string AssemblyDir = Path.GetDirectoryName (output);
1195
1196                         // the StrongName key file may be relative to (a) the compiled
1197                         // file or (b) to the output assembly. See bugzilla #55320
1198                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1199
1200                         // (a) relative to the compiled file
1201                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1202                         bool exist = File.Exists (filename);
1203                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1204                                 // (b) relative to the outputed assembly
1205                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1206                                 exist = File.Exists (filename);
1207                         }
1208
1209                         if (exist) {
1210                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1211                                         byte[] snkeypair = new byte [fs.Length];
1212                                         fs.Read (snkeypair, 0, snkeypair.Length);
1213
1214                                         if (RootContext.StrongNameDelaySign) {
1215                                                 // delayed signing - DO NOT include private key
1216                                                 SetPublicKey (an, snkeypair);
1217                                         }
1218                                         else {
1219                                                 // no delay so we make sure we have the private key
1220                                                 try {
1221                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1222                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1223                                                 }
1224                                                 catch (CryptographicException) {
1225                                                         if (snkeypair.Length == 16) {
1226                                                                 // error # is different for ECMA key
1227                                                                 Report.Error (1606, "Could not strongname the assembly. " +
1228                                                                         "ECMA key can only be used to delay-sign assemblies");
1229                                                         }
1230                                                         else {
1231                                                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1232                                                                         RootContext.StrongNameKeyFile +
1233                                                                         "' doesn't have a private key.");
1234                                                         }
1235                                                         Environment.Exit (1);
1236                                                 }
1237                                         }
1238                                 }
1239                         }
1240                         else {
1241                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1242                                         RootContext.StrongNameKeyFile + "' not found.");
1243                                 Environment.Exit (1);
1244                         }
1245                         return an;
1246                 }
1247
1248                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1249                 {
1250                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1251                                 if (declarative_security == null)
1252                                         declarative_security = new ListDictionary ();
1253
1254                                 a.ExtractSecurityPermissionSet (declarative_security);
1255                                 return;
1256                         }
1257
1258                         Builder.SetCustomAttribute (customBuilder);
1259                 }
1260
1261                 public override void Emit (TypeContainer tc)
1262                 {
1263                         base.Emit (tc);
1264
1265                         if (declarative_security != null) {
1266
1267                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1268                                 object builder_instance = Builder;
1269
1270                                 try {
1271                                         // Microsoft runtime hacking
1272                                         if (add_permission == null) {
1273                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1274                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1275
1276                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1277                                                 builder_instance = fi.GetValue (Builder);
1278                                         }
1279
1280                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1281                                                                                                   declarative_security [SecurityAction.RequestOptional],
1282                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1283                                         add_permission.Invoke (builder_instance, args);
1284                                 }
1285                                 catch {
1286                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1287                                 }
1288                         }
1289                 }
1290
1291                 public override string[] ValidAttributeTargets {
1292                         get {
1293                                 return attribute_targets;
1294                         }
1295                 }
1296         }
1297
1298         public class ModuleClass: CommonAssemblyModulClass {
1299                 // TODO: make it private and move all builder based methods here
1300                 public ModuleBuilder Builder;
1301                 bool m_module_is_unsafe;
1302
1303                 static string[] attribute_targets = new string [] { "module" };
1304
1305                 public ModuleClass (bool is_unsafe)
1306                 {
1307                         m_module_is_unsafe = is_unsafe;
1308                 }
1309
1310                 public override AttributeTargets AttributeTargets {
1311                         get {
1312                                 return AttributeTargets.Module;
1313                         }
1314                 }
1315
1316                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1317                 {
1318                         return CodeGen.Assembly.IsClsCompliant;
1319                         }
1320
1321                 public override void Emit (TypeContainer tc)
1322                 {
1323                         base.Emit (tc);
1324
1325                         if (!m_module_is_unsafe)
1326                                 return;
1327
1328                         if (TypeManager.unverifiable_code_ctor == null) {
1329                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1330                                 return;
1331                         }
1332
1333                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1334                 }
1335
1336                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1337                 {
1338                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1339                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1340                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1341                                 }
1342                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1343                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.Name);
1344                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1345                                         return;
1346                                 }
1347                         }
1348
1349                         Builder.SetCustomAttribute (customBuilder);
1350                 }
1351
1352                 public override string[] ValidAttributeTargets {
1353                         get {
1354                                 return attribute_targets;
1355                         }
1356                 }
1357         }
1358 }