mcs/mcs/codegen.cs

   1 //
   2 // codegen.cs: The code generator
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // (C) 2001, 2002, 2003 Ximian, Inc.
   8 // (C) 2004 Novell, Inc.
   9 //
  10 //#define PRODUCTION
  11 using System;
  12 using System.IO;
  13 using System.Collections;
  14 using System.Collections.Specialized;
  15 using System.Reflection;
  16 using System.Reflection.Emit;
  17 using System.Runtime.InteropServices;
  18 using System.Security;
  19 using System.Security.Cryptography;
  20 using System.Security.Permissions;
  21
  22 using Mono.Security.Cryptography;
  23
  24 namespace Mono.CSharp {
  25
  26         /// <summary>
  27         ///    Code generator class.
  28         /// </summary>
  29         public class CodeGen {
  30                 static AppDomain current_domain;
  31                 static public SymbolWriter SymbolWriter;
  32
  33                 public static AssemblyClass Assembly;
  34                 public static ModuleClass Module;
  35
  36                 static CodeGen ()
  37                 {
  38                         Reset ();
  39                 }
  40
  41                 public static void Reset ()
  42                 {
  43                         Assembly = new AssemblyClass ();
  44                         Module = new ModuleClass (RootContext.Unsafe);
  45                 }
  46
  47                 public static string Basename (string name)
  48                 {
  49                         int pos = name.LastIndexOf ('/');
  50
  51                         if (pos != -1)
  52                                 return name.Substring (pos + 1);
  53
  54                         pos = name.LastIndexOf ('\\');
  55                         if (pos != -1)
  56                                 return name.Substring (pos + 1);
  57
  58                         return name;
  59                 }
  60
  61                 public static string Dirname (string name)
  62                 {
  63                         int pos = name.LastIndexOf ('/');
  64
  65                         if (pos != -1)
  66                                 return name.Substring (0, pos);
  67
  68                         pos = name.LastIndexOf ('\\');
  69                         if (pos != -1)
  70                                 return name.Substring (0, pos);
  71
  72                         return ".";
  73                 }
  74
  75                 static public string FileName;
  76
  77                 //
  78                 // Initializes the symbol writer
  79                 //
  80                 static void InitializeSymbolWriter (string filename)
  81                 {
  82                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  83
  84                         //
  85                         // If we got an ISymbolWriter instance, initialize it.
  86                         //
  87                         if (SymbolWriter == null) {
  88                                 Report.Warning (
  89                                         -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.");
  90                                 return;
  91                         }
  92                 }
  93
  94                 //
  95                 // Initializes the code generator variables
  96                 //
  97                 static public bool Init (string name, string output, bool want_debugging_support)
  98                 {
  99                         FileName = output;
 100                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 101                         if (an == null)
 102                                 return false;
 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                                 return false;
 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                                 return false;
 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                         return true;
 158                 }
 159
 160                 static public void Save (string name)
 161                 {
 162                         try {
 163                                 Assembly.Builder.Save (Basename (name));
 164                         }
 165                         catch (COMException) {
 166                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 167                                         throw;
 168
 169                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 170                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 171                                         RootContext.StrongNameKeyFile +
 172                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 173                         }
 174                         catch (System.IO.IOException io) {
 175                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 176                         }
 177                         catch (System.UnauthorizedAccessException ua) {
 178                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 179                         }
 180
 181                         if (SymbolWriter != null)
 182                                 SymbolWriter.WriteSymbolFile ();
 183                 }
 184         }
 185
 186         //
 187         // Provides "local" store across code that can yield: locals
 188         // or fields, notice that this should not be used by anonymous
 189         // methods to create local storage, those only require
 190         // variable mapping.
 191         //
 192         public class VariableStorage {
 193                 FieldBuilder fb;
 194                 LocalBuilder local;
 195
 196                 static int count;
 197
 198                 public VariableStorage (EmitContext ec, Type t)
 199                 {
 200                         count++;
 201                         if (ec.InIterator)
 202                                 fb = ec.CurrentIterator.MapVariable ("s_", count.ToString (), t);
 203                         else
 204                                 local = ec.ig.DeclareLocal (t);
 205                 }
 206
 207                 public void EmitThis (ILGenerator ig)
 208                 {
 209                         if (fb != null)
 210                                 ig.Emit (OpCodes.Ldarg_0);
 211                 }
 212
 213                 public void EmitStore (ILGenerator ig)
 214                 {
 215                         if (fb == null)
 216                                 ig.Emit (OpCodes.Stloc, local);
 217                         else
 218                                 ig.Emit (OpCodes.Stfld, fb);
 219                 }
 220
 221                 public void EmitLoad (ILGenerator ig)
 222                 {
 223                         if (fb == null)
 224                                 ig.Emit (OpCodes.Ldloc, local);
 225                         else
 226                                 ig.Emit (OpCodes.Ldfld, fb);
 227                 }
 228
 229                 public void EmitLoadAddress (ILGenerator ig)
 230                 {
 231                         if (fb == null)
 232                                 ig.Emit (OpCodes.Ldloca, local);
 233                         else
 234                                 ig.Emit (OpCodes.Ldflda, fb);
 235                 }
 236
 237                 public void EmitCall (ILGenerator ig, MethodInfo mi)
 238                 {
 239                         // FIXME : we should handle a call like tostring
 240                         // here, where boxing is needed. However, we will
 241                         // never encounter that with the current usage.
 242
 243                         bool value_type_call;
 244                         EmitThis (ig);
 245                         if (fb == null) {
 246                                 value_type_call = local.LocalType.IsValueType;
 247
 248                                 if (value_type_call)
 249                                         ig.Emit (OpCodes.Ldloca, local);
 250                                 else
 251                                         ig.Emit (OpCodes.Ldloc, local);
 252                         } else {
 253                                 value_type_call = fb.FieldType.IsValueType;
 254
 255                                 if (value_type_call)
 256                                         ig.Emit (OpCodes.Ldflda, fb);
 257                                 else
 258                                         ig.Emit (OpCodes.Ldfld, fb);
 259                         }
 260
 261                         ig.Emit (value_type_call ? OpCodes.Call : OpCodes.Callvirt, mi);
 262                 }
 263         }
 264
 265         /// <summary>
 266         ///   An Emit Context is created for each body of code (from methods,
 267         ///   properties bodies, indexer bodies or constructor bodies)
 268         /// </summary>
 269         public class EmitContext {
 270                 public DeclSpace DeclSpace;
 271                 public DeclSpace TypeContainer;
 272                 public ILGenerator   ig;
 273
 274                 /// <summary>
 275                 ///   This variable tracks the `checked' state of the compilation,
 276                 ///   it controls whether we should generate code that does overflow
 277                 ///   checking, or if we generate code that ignores overflows.
 278                 ///
 279                 ///   The default setting comes from the command line option to generate
 280                 ///   checked or unchecked code plus any source code changes using the
 281                 ///   checked/unchecked statements or expressions.   Contrast this with
 282                 ///   the ConstantCheckState flag.
 283                 /// </summary>
 284
 285                 public bool CheckState;
 286
 287                 /// <summary>
 288                 ///   The constant check state is always set to `true' and cant be changed
 289                 ///   from the command line.  The source code can change this setting with
 290                 ///   the `checked' and `unchecked' statements and expressions.
 291                 /// </summary>
 292                 public bool ConstantCheckState;
 293
 294                 /// <summary>
 295                 ///   Whether we are emitting code inside a static or instance method
 296                 /// </summary>
 297                 public bool IsStatic;
 298
 299                 /// <summary>
 300                 ///   Whether the actual created method is static or instance method.
 301                 ///   Althoug the method might be declared as `static', if an anonymous
 302                 ///   method is involved, we might turn this into an instance method.
 303                 ///
 304                 ///   So this reflects the low-level staticness of the method, while
 305                 ///   IsStatic represents the semantic, high-level staticness.
 306                 /// </summary>
 307                 public bool MethodIsStatic;
 308
 309                 /// <summary>
 310                 ///   Whether we are emitting a field initializer
 311                 /// </summary>
 312                 public bool IsFieldInitializer;
 313
 314                 /// <summary>
 315                 ///   The value that is allowed to be returned or NULL if there is no
 316                 ///   return type.
 317                 /// </summary>
 318                 public Type ReturnType;
 319
 320                 /// <summary>
 321                 ///   Points to the Type (extracted from the TypeContainer) that
 322                 ///   declares this body of code
 323                 /// </summary>
 324                 public Type ContainerType;
 325
 326                 /// <summary>
 327                 ///   Whether this is generating code for a constructor
 328                 /// </summary>
 329                 public bool IsConstructor;
 330
 331                 /// <summary>
 332                 ///   Whether we're control flow analysis enabled
 333                 /// </summary>
 334                 public bool DoFlowAnalysis;
 335
 336                 /// <summary>
 337                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 338                 ///   to store structures (used to compute the address of the structure
 339                 ///   value on structure method invocations)
 340                 /// </summary>
 341                 public Hashtable temporary_storage;
 342
 343                 public Block CurrentBlock;
 344
 345                 public int CurrentFile;
 346
 347                 /// <summary>
 348                 ///   The location where we store the return value.
 349                 /// </summary>
 350                 LocalBuilder return_value;
 351
 352                 /// <summary>
 353                 ///   The location where return has to jump to return the
 354                 ///   value
 355                 /// </summary>
 356                 public Label ReturnLabel;
 357
 358                 /// <summary>
 359                 ///   If we already defined the ReturnLabel
 360                 /// </summary>
 361                 public bool HasReturnLabel;
 362
 363                 /// <summary>
 364                 ///   Whether we are inside an iterator block.
 365                 /// </summary>
 366                 public bool InIterator;
 367
 368                 public bool IsLastStatement;
 369
 370                 /// <summary>
 371                 ///   Whether remapping of locals, parameters and fields is turned on.
 372                 ///   Used by iterators and anonymous methods.
 373                 /// </summary>
 374                 public bool RemapToProxy;
 375
 376                 /// <summary>
 377                 ///  Whether we are inside an unsafe block
 378                 /// </summary>
 379                 public bool InUnsafe;
 380
 381                 /// <summary>
 382                 ///  Whether we are in a `fixed' initialization
 383                 /// </summary>
 384                 public bool InFixedInitializer;
 385
 386                 public bool InRefOutArgumentResolving;
 387
 388                 public bool InCatch;
 389                 public bool InFinally;
 390
 391                 /// <summary>
 392                 ///  Whether we are inside an anonymous method.
 393                 /// </summary>
 394                 public AnonymousMethod CurrentAnonymousMethod;
 395
 396                 /// <summary>
 397                 ///   Location for this EmitContext
 398                 /// </summary>
 399                 public Location loc;
 400
 401                 /// <summary>
 402                 ///   Inside an enum definition, we do not resolve enumeration values
 403                 ///   to their enumerations, but rather to the underlying type/value
 404                 ///   This is so EnumVal + EnumValB can be evaluated.
 405                 ///
 406                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 407                 ///   we relax the rules
 408                 /// </summary>
 409                 public bool InEnumContext;
 410
 411                 /// <summary>
 412                 ///   Anonymous methods can capture local variables and fields,
 413                 ///   this object tracks it.  It is copied from the TopLevelBlock
 414                 ///   field.
 415                 /// </summary>
 416                 public CaptureContext capture_context;
 417
 418                 /// <summary>
 419                 /// Trace when method is called and is obsolete then this member suppress message
 420                 /// when call is inside next [Obsolete] method or type.
 421                 /// </summary>
 422                 public bool TestObsoleteMethodUsage = true;
 423
 424                 /// <summary>
 425                 ///    The current iterator
 426                 /// </summary>
 427                 public Iterator CurrentIterator;
 428
 429                 /// <summary>
 430                 ///    Whether we are in the resolving stage or not
 431                 /// </summary>
 432                 enum Phase {
 433                         Created,
 434                         Resolving,
 435                         Emitting
 436                 }
 437
 438                 Phase current_phase;
 439                 FlowBranching current_flow_branching;
 440
 441                 public EmitContext (DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 442                                     Type return_type, int code_flags, bool is_constructor)
 443                 {
 444                         this.ig = ig;
 445
 446                         TypeContainer = parent;
 447                         DeclSpace = ds;
 448                         CheckState = RootContext.Checked;
 449                         ConstantCheckState = true;
 450
 451                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 452                         MethodIsStatic = IsStatic;
 453                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 454                         RemapToProxy = InIterator;
 455                         ReturnType = return_type;
 456                         IsConstructor = is_constructor;
 457                         CurrentBlock = null;
 458                         CurrentFile = 0;
 459                         current_phase = Phase.Created;
 460
 461                         if (parent != null){
 462                                 // Can only be null for the ResolveType contexts.
 463                                 ContainerType = parent.TypeBuilder;
 464                                 if (parent.UnsafeContext)
 465                                         InUnsafe = true;
 466                                 else
 467                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 468                         }
 469                         loc = l;
 470
 471                         if (ReturnType == TypeManager.void_type)
 472                                 ReturnType = null;
 473                 }
 474
 475                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 476                                     Type return_type, int code_flags, bool is_constructor)
 477                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 478                 {
 479                 }
 480
 481                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 482                                     Type return_type, int code_flags)
 483                         : this (tc, tc, l, ig, return_type, code_flags, false)
 484                 {
 485                 }
 486
 487                 public FlowBranching CurrentBranching {
 488                         get {
 489                                 return current_flow_branching;
 490                         }
 491                 }
 492
 493                 public bool HaveCaptureInfo {
 494                         get {
 495                                 return capture_context != null;
 496                         }
 497                 }
 498
 499                 // <summary>
 500                 //   Starts a new code branching.  This inherits the state of all local
 501                 //   variables and parameters from the current branching.
 502                 // </summary>
 503                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 504                 {
 505                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 506                         return current_flow_branching;
 507                 }
 508
 509                 // <summary>
 510                 //   Starts a new code branching for block `block'.
 511                 // </summary>
 512                 public FlowBranching StartFlowBranching (Block block)
 513                 {
 514                         FlowBranching.BranchingType type;
 515
 516                         if (CurrentBranching.Type == FlowBranching.BranchingType.Switch)
 517                                 type = FlowBranching.BranchingType.SwitchSection;
 518                         else
 519                                 type = FlowBranching.BranchingType.Block;
 520
 521                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, block, block.StartLocation);
 522                         return current_flow_branching;
 523                 }
 524
 525                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 526                 {
 527                         FlowBranchingException branching = new FlowBranchingException (
 528                                 CurrentBranching, stmt);
 529                         current_flow_branching = branching;
 530                         return branching;
 531                 }
 532
 533                 // <summary>
 534                 //   Ends a code branching.  Merges the state of locals and parameters
 535                 //   from all the children of the ending branching.
 536                 // </summary>
 537                 public FlowBranching.UsageVector DoEndFlowBranching ()
 538                 {
 539                         FlowBranching old = current_flow_branching;
 540                         current_flow_branching = current_flow_branching.Parent;
 541
 542                         return current_flow_branching.MergeChild (old);
 543                 }
 544
 545                 // <summary>
 546                 //   Ends a code branching.  Merges the state of locals and parameters
 547                 //   from all the children of the ending branching.
 548                 // </summary>
 549                 public FlowBranching.Reachability EndFlowBranching ()
 550                 {
 551                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 552
 553                         return vector.Reachability;
 554                 }
 555
 556                 // <summary>
 557                 //   Kills the current code branching.  This throws away any changed state
 558                 //   information and should only be used in case of an error.
 559                 // </summary>
 560                 public void KillFlowBranching ()
 561                 {
 562                         current_flow_branching = current_flow_branching.Parent;
 563                 }
 564
 565                 public void CaptureVariable (LocalInfo li)
 566                 {
 567                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 568                         li.IsCaptured = true;
 569                 }
 570
 571                 public void CaptureParameter (string name, Type t, int idx)
 572                 {
 573                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 574                 }
 575
 576                 public void CaptureThis ()
 577                 {
 578                         capture_context.CaptureThis ();
 579                 }
 580
 581
 582                 //
 583                 // Use to register a field as captured
 584                 //
 585                 public void CaptureField (FieldExpr fe)
 586                 {
 587                         capture_context.AddField (fe);
 588                 }
 589
 590                 //
 591                 // Whether anonymous methods have captured variables
 592                 //
 593                 public bool HaveCapturedVariables ()
 594                 {
 595                         if (capture_context != null)
 596                                 return capture_context.HaveCapturedVariables;
 597                         return false;
 598                 }
 599
 600                 //
 601                 // Whether anonymous methods have captured fields or this.
 602                 //
 603                 public bool HaveCapturedFields ()
 604                 {
 605                         if (capture_context != null)
 606                                 return capture_context.HaveCapturedFields;
 607                         return false;
 608                 }
 609
 610                 //
 611                 // Emits the instance pointer for the host method
 612                 //
 613                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 614                 {
 615                         if (capture_context != null)
 616                                 capture_context.EmitMethodHostInstance (target, am);
 617                         else if (IsStatic)
 618                                 target.ig.Emit (OpCodes.Ldnull);
 619                         else
 620                                 target.ig.Emit (OpCodes.Ldarg_0);
 621                 }
 622
 623                 //
 624                 // Returns whether the `local' variable has been captured by an anonymous
 625                 // method
 626                 //
 627                 public bool IsCaptured (LocalInfo local)
 628                 {
 629                         return capture_context.IsCaptured (local);
 630                 }
 631
 632                 public bool IsParameterCaptured (string name)
 633                 {
 634                         if (capture_context != null)
 635                                 return capture_context.IsParameterCaptured (name);
 636                         return false;
 637                 }
 638
 639                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 640                 {
 641                         if (capture_context != null)
 642                                 capture_context.EmitAnonymousHelperClasses (this);
 643                         b.EmitMeta (this);
 644
 645                         if (HasReturnLabel)
 646                                 ReturnLabel = ig.DefineLabel ();
 647                 }
 648
 649                 //
 650                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 651                 // currently can not cope with ig == null during resolve (which must
 652                 // be fixed for switch statements to work on anonymous methods).
 653                 //
 654                 public void EmitTopBlock (ToplevelBlock block, InternalParameters ip, Location loc)
 655                 {
 656                         if (block == null)
 657                                 return;
 658
 659                         bool unreachable;
 660
 661                         if (ResolveTopBlock (null, block, ip, loc, out unreachable)){
 662                                 EmitMeta (block, ip);
 663
 664                                 current_phase = Phase.Emitting;
 665                                 EmitResolvedTopBlock (block, unreachable);
 666                         }
 667                 }
 668
 669                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 670                                              InternalParameters ip, Location loc, out bool unreachable)
 671                 {
 672                         current_phase = Phase.Resolving;
 673
 674                         unreachable = false;
 675
 676                         capture_context = block.CaptureContext;
 677
 678                         if (!Location.IsNull (loc))
 679                                 CurrentFile = loc.File;
 680
 681 #if PRODUCTION
 682                         try {
 683 #endif
 684                                 int errors = Report.Errors;
 685
 686                                 block.ResolveMeta (block, this, ip);
 687                                 if (Report.Errors != errors)
 688                                         return false;
 689
 690                                         bool old_do_flow_analysis = DoFlowAnalysis;
 691                                         DoFlowAnalysis = true;
 692
 693                                         if (anonymous_method_host != null)
 694                                                 current_flow_branching = FlowBranching.CreateBranching (
 695                                                 anonymous_method_host.CurrentBranching, FlowBranching.BranchingType.Block,
 696                                                 block, loc);
 697                                         else
 698                                                 current_flow_branching = FlowBranching.CreateBranching (
 699                                                         null, FlowBranching.BranchingType.Block, block, loc);
 700
 701                                         if (!block.Resolve (this)) {
 702                                                 current_flow_branching = null;
 703                                                 DoFlowAnalysis = old_do_flow_analysis;
 704                                                 return false;
 705                                         }
 706
 707                                         FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 708                                         current_flow_branching = null;
 709
 710                                         DoFlowAnalysis = old_do_flow_analysis;
 711
 712                                         if (reachability.AlwaysReturns ||
 713                                             reachability.AlwaysThrows ||
 714                                             reachability.IsUnreachable)
 715                                                 unreachable = true;
 716 #if PRODUCTION
 717                         } catch (Exception e) {
 718                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 719                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 720
 721                                         if (CurrentBlock != null){
 722                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 723                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 724                                         }
 725                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 726                                         throw;
 727                         }
 728 #endif
 729
 730                         if (ReturnType != null && !unreachable){
 731                                 if (!InIterator){
 732                                         if (CurrentAnonymousMethod != null){
 733                                                 Report.Error (1643, loc, "Not all code paths return a value in anonymous method of type `{0}'",
 734                                                               CurrentAnonymousMethod.Type);
 735                                         } else {
 736                                                 Report.Error (161, loc, "Not all code paths return a value");
 737                                         }
 738
 739                                         return false;
 740                                 }
 741                         }
 742                         block.CompleteContexts ();
 743
 744                         return true;
 745                 }
 746
 747                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 748                 {
 749                         if (block != null)
 750                                 block.Emit (this);
 751
 752                         if (HasReturnLabel)
 753                                 ig.MarkLabel (ReturnLabel);
 754
 755                         if (return_value != null){
 756                                 ig.Emit (OpCodes.Ldloc, return_value);
 757                                 ig.Emit (OpCodes.Ret);
 758                         } else {
 759                                 //
 760                                 // If `HasReturnLabel' is set, then we already emitted a
 761                                 // jump to the end of the method, so we must emit a `ret'
 762                                 // there.
 763                                 //
 764                                 // Unfortunately, System.Reflection.Emit automatically emits
 765                                 // a leave to the end of a finally block.  This is a problem
 766                                 // if no code is following the try/finally block since we may
 767                                 // jump to a point after the end of the method.
 768                                 // As a workaround, we're always creating a return label in
 769                                 // this case.
 770                                 //
 771
 772                                 if ((block != null) && block.IsDestructor) {
 773                                         // Nothing to do; S.R.E automatically emits a leave.
 774                                 } else if (HasReturnLabel || (!unreachable && !InIterator)) {
 775                                         if (ReturnType != null)
 776                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 777                                         ig.Emit (OpCodes.Ret);
 778                                 }
 779                         }
 780
 781                         //
 782                         // Close pending helper classes if we are the toplevel
 783                         //
 784                         if (capture_context != null && capture_context.ParentToplevel == null)
 785                                 capture_context.CloseAnonymousHelperClasses ();
 786                 }
 787
 788                 /// <summary>
 789                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 790                 ///   writer to which source line this opcode belongs.
 791                 /// </summary>
 792                 public void Mark (Location loc, bool check_file)
 793                 {
 794                         if ((CodeGen.SymbolWriter == null) || Location.IsNull (loc))
 795                                 return;
 796
 797                         if (check_file && (CurrentFile != loc.File))
 798                                 return;
 799
 800                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, 0);
 801                 }
 802
 803                 public void DefineLocalVariable (string name, LocalBuilder builder)
 804                 {
 805                         if (CodeGen.SymbolWriter == null)
 806                                 return;
 807
 808                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 809                 }
 810
 811                 public void BeginScope ()
 812                 {
 813                         ig.BeginScope();
 814
 815                         if (CodeGen.SymbolWriter != null)
 816                                 CodeGen.SymbolWriter.OpenScope(ig);
 817                 }
 818
 819                 public void EndScope ()
 820                 {
 821                         ig.EndScope();
 822
 823                         if (CodeGen.SymbolWriter != null)
 824                                 CodeGen.SymbolWriter.CloseScope(ig);
 825                 }
 826
 827                 /// <summary>
 828                 ///   Returns a temporary storage for a variable of type t as
 829                 ///   a local variable in the current body.
 830                 /// </summary>
 831                 public LocalBuilder GetTemporaryLocal (Type t)
 832                 {
 833                         LocalBuilder location = null;
 834
 835                         if (temporary_storage != null){
 836                                 object o = temporary_storage [t];
 837                                 if (o != null){
 838                                         if (o is ArrayList){
 839                                                 ArrayList al = (ArrayList) o;
 840
 841                                                 for (int i = 0; i < al.Count; i++){
 842                                                         if (al [i] != null){
 843                                                                 location = (LocalBuilder) al [i];
 844                                                                 al [i] = null;
 845                                                                 break;
 846                                                         }
 847                                                 }
 848                                         } else
 849                                                 location = (LocalBuilder) o;
 850                                         if (location != null)
 851                                                 return location;
 852                                 }
 853                         }
 854
 855                         return ig.DeclareLocal (t);
 856                 }
 857
 858                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 859                 {
 860                         if (temporary_storage == null){
 861                                 temporary_storage = new Hashtable ();
 862                                 temporary_storage [t] = b;
 863                                 return;
 864                         }
 865                         object o = temporary_storage [t];
 866                         if (o == null){
 867                                 temporary_storage [t] = b;
 868                                 return;
 869                         }
 870                         if (o is ArrayList){
 871                                 ArrayList al = (ArrayList) o;
 872                                 for (int i = 0; i < al.Count; i++){
 873                                         if (al [i] == null){
 874                                                 al [i] = b;
 875                                                 return;
 876                                         }
 877                                 }
 878                                 al.Add (b);
 879                                 return;
 880                         }
 881                         ArrayList replacement = new ArrayList ();
 882                         replacement.Add (o);
 883                         temporary_storage.Remove (t);
 884                         temporary_storage [t] = replacement;
 885                 }
 886
 887                 /// <summary>
 888                 ///   Current loop begin and end labels.
 889                 /// </summary>
 890                 public Label LoopBegin, LoopEnd;
 891
 892                 /// <summary>
 893                 ///   Default target in a switch statement.   Only valid if
 894                 ///   InSwitch is true
 895                 /// </summary>
 896                 public Label DefaultTarget;
 897
 898                 /// <summary>
 899                 ///   If this is non-null, points to the current switch statement
 900                 /// </summary>
 901                 public Switch Switch;
 902
 903                 /// <summary>
 904                 ///   ReturnValue creates on demand the LocalBuilder for the
 905                 ///   return value from the function.  By default this is not
 906                 ///   used.  This is only required when returns are found inside
 907                 ///   Try or Catch statements.
 908                 ///
 909                 ///   This method is typically invoked from the Emit phase, so
 910                 ///   we allow the creation of a return label if it was not
 911                 ///   requested during the resolution phase.   Could be cleaned
 912                 ///   up, but it would replicate a lot of logic in the Emit phase
 913                 ///   of the code that uses it.
 914                 /// </summary>
 915                 public LocalBuilder TemporaryReturn ()
 916                 {
 917                         if (return_value == null){
 918                                 return_value = ig.DeclareLocal (ReturnType);
 919                                 if (!HasReturnLabel){
 920                                         ReturnLabel = ig.DefineLabel ();
 921                                         HasReturnLabel = true;
 922                                 }
 923                         }
 924
 925                         return return_value;
 926                 }
 927
 928                 /// <summary>
 929                 ///   This method is used during the Resolution phase to flag the
 930                 ///   need to define the ReturnLabel
 931                 /// </summary>
 932                 public void NeedReturnLabel ()
 933                 {
 934                         if (current_phase != Phase.Resolving){
 935                                 //
 936                                 // The reason is that the `ReturnLabel' is declared between
 937                                 // resolution and emission
 938                                 //
 939                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 940                         }
 941
 942                         if (!InIterator && !HasReturnLabel)
 943                                 HasReturnLabel = true;
 944                 }
 945
 946                 //
 947                 // Creates a field `name' with the type `t' on the proxy class
 948                 //
 949                 public FieldBuilder MapVariable (string name, Type t)
 950                 {
 951                         if (InIterator)
 952                                 return CurrentIterator.MapVariable ("v_", name, t);
 953
 954                         throw new Exception ("MapVariable for an unknown state");
 955                 }
 956
 957                 public Expression RemapParameter (int idx)
 958                 {
 959                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 960                         fe.InstanceExpression = new ProxyInstance ();
 961                         return fe.DoResolve (this);
 962                 }
 963
 964                 public Expression RemapParameterLValue (int idx, Expression right_side)
 965                 {
 966                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 967                         fe.InstanceExpression = new ProxyInstance ();
 968                         return fe.DoResolveLValue (this, right_side);
 969                 }
 970
 971                 //
 972                 // Emits the proper object to address fields on a remapped
 973                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 974                 //
 975                 public void EmitThis ()
 976                 {
 977                         ig.Emit (OpCodes.Ldarg_0);
 978                         if (InIterator){
 979                                 if (!IsStatic){
 980                                         FieldBuilder this_field = CurrentIterator.this_field.FieldBuilder;
 981                                         if (TypeManager.IsValueType (this_field.FieldType))
 982                                                 ig.Emit (OpCodes.Ldflda, this_field);
 983                                         else
 984                                                 ig.Emit (OpCodes.Ldfld, this_field);
 985                                 }
 986                         } else if (capture_context != null && CurrentAnonymousMethod != null){
 987                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 988                                 while (si != null){
 989                                         if (si.ParentLink != null)
 990                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 991                                         if (si.THIS != null){
 992                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 993                                                 break;
 994                                         }
 995                                         si = si.ParentScope;
 996                                 }
 997                         }
 998                 }
 999
1000                 //
1001                 // Emits the code necessary to load the instance required
1002                 // to access the captured LocalInfo
1003                 //
1004                 public void EmitCapturedVariableInstance (LocalInfo li)
1005                 {
1006                         if (RemapToProxy){
1007                                 ig.Emit (OpCodes.Ldarg_0);
1008                                 return;
1009                         }
1010
1011                         if (capture_context == null)
1012                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
1013
1014                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1015                 }
1016
1017                 public void EmitParameter (string name)
1018                 {
1019                         capture_context.EmitParameter (this, name);
1020                 }
1021
1022                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
1023                 {
1024                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
1025                 }
1026
1027                 public void EmitAddressOfParameter (string name)
1028                 {
1029                         capture_context.EmitAddressOfParameter (this, name);
1030                 }
1031
1032                 public Expression GetThis (Location loc)
1033                 {
1034                         This my_this;
1035                         if (CurrentBlock != null)
1036                                 my_this = new This (CurrentBlock, loc);
1037                         else
1038                                 my_this = new This (loc);
1039
1040                         if (!my_this.ResolveBase (this))
1041                                 my_this = null;
1042
1043                         return my_this;
1044                 }
1045         }
1046
1047
1048         public abstract class CommonAssemblyModulClass: Attributable {
1049                 protected CommonAssemblyModulClass ():
1050                         base (null)
1051                 {
1052                 }
1053
1054                 public void AddAttributes (ArrayList attrs)
1055                 {
1056                         if (OptAttributes == null) {
1057                                 OptAttributes = new Attributes (attrs);
1058                                 return;
1059                         }
1060                         OptAttributes.AddAttributes (attrs);
1061                 }
1062
1063                 public virtual void Emit (TypeContainer tc)
1064                 {
1065                         if (OptAttributes == null)
1066                                 return;
1067
1068                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
1069                         OptAttributes.Emit (ec, this);
1070                 }
1071
1072                 protected Attribute ResolveAttribute (Type a_type)
1073                 {
1074                         if (OptAttributes == null)
1075                                 return null;
1076
1077                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1078                         if (!OptAttributes.CheckTargets (this))
1079                                 return null;
1080
1081                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1082                         Attribute a = OptAttributes.Search (a_type, temp_ec);
1083                         if (a != null) {
1084                                 a.Resolve (temp_ec);
1085                         }
1086                         return a;
1087                 }
1088         }
1089
1090         public class AssemblyClass: CommonAssemblyModulClass {
1091                 // TODO: make it private and move all builder based methods here
1092                 public AssemblyBuilder Builder;
1093                 bool is_cls_compliant;
1094                 public Attribute ClsCompliantAttribute;
1095
1096                 ListDictionary declarative_security;
1097
1098                 static string[] attribute_targets = new string [] { "assembly" };
1099
1100                 public AssemblyClass (): base ()
1101                 {
1102                         is_cls_compliant = false;
1103                 }
1104
1105                 public bool IsClsCompliant {
1106                         get {
1107                                 return is_cls_compliant;
1108                         }
1109                 }
1110
1111                 public override AttributeTargets AttributeTargets {
1112                         get {
1113                                 return AttributeTargets.Assembly;
1114                         }
1115                 }
1116
1117                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1118                 {
1119                         return is_cls_compliant;
1120                 }
1121
1122                 public void ResolveClsCompliance ()
1123                 {
1124                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1125                         if (ClsCompliantAttribute == null)
1126                                 return;
1127
1128                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1129                 }
1130
1131                 // fix bug #56621
1132                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1133                 {
1134                         try {
1135                                 // check for possible ECMA key
1136                                 if (strongNameBlob.Length == 16) {
1137                                         // will be rejected if not "the" ECMA key
1138                                         an.SetPublicKey (strongNameBlob);
1139                                 }
1140                                 else {
1141                                         // take it, with or without, a private key
1142                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1143                                         // and make sure we only feed the public part to Sys.Ref
1144                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1145
1146                                         // AssemblyName.SetPublicKey requires an additional header
1147                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1148
1149                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1150                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1151                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1152                                         an.SetPublicKey (encodedPublicKey);
1153                                 }
1154                         }
1155                         catch (Exception) {
1156                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1157                                         RootContext.StrongNameKeyFile + "' incorrectly encoded.");
1158                                 Environment.Exit (1);
1159                         }
1160                 }
1161
1162                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1163                 public AssemblyName GetAssemblyName (string name, string output)
1164                 {
1165                         if (OptAttributes != null) {
1166                                 foreach (Attribute a in OptAttributes.Attrs) {
1167                                         // cannot rely on any resolve-based members before you call Resolve
1168                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1169                                                 continue;
1170
1171                                         // TODO: This code is buggy: comparing Attribute name without resolving it is wrong.
1172                                         //       However, this is invoked by CodeGen.Init, at which time none of the namespaces
1173                                         //       are loaded yet.
1174                                         switch (a.Name) {
1175                                                 case "AssemblyKeyFile":
1176                                                 case "AssemblyKeyFileAttribute":
1177                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1178                                                         if (RootContext.StrongNameKeyFile != null) {
1179                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1180                                                                 Report.Warning (1616, "Compiler option '{0}' overrides '{1}' given in source", "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1181                                                         }
1182                                                         else {
1183                                                                 string value = a.GetString ();
1184                                                                 if (value != String.Empty)
1185                                                                         RootContext.StrongNameKeyFile = value;
1186                                                         }
1187                                                         break;
1188                                                 case "AssemblyKeyName":
1189                                                 case "AssemblyKeyNameAttribute":
1190                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1191                                                         if (RootContext.StrongNameKeyContainer != null) {
1192                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1193                                                                 Report.Warning (1616, "keycontainer", "Compiler option '{0}' overrides '{1}' given in source", "System.Reflection.AssemblyKeyNameAttribute");
1194                                                         }
1195                                                         else {
1196                                                                 string value = a.GetString ();
1197                                                                 if (value != String.Empty)
1198                                                                         RootContext.StrongNameKeyContainer = value;
1199                                                         }
1200                                                         break;
1201                                                 case "AssemblyDelaySign":
1202                                                 case "AssemblyDelaySignAttribute":
1203                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1204                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1205                                                         break;
1206                                         }
1207                                 }
1208                         }
1209
1210                         AssemblyName an = new AssemblyName ();
1211                         an.Name = Path.GetFileNameWithoutExtension (name);
1212
1213                         // note: delay doesn't apply when using a key container
1214                         if (RootContext.StrongNameKeyContainer != null) {
1215                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1216                                 return an;
1217                         }
1218
1219                         // strongname is optional
1220                         if (RootContext.StrongNameKeyFile == null)
1221                                 return an;
1222
1223                         string AssemblyDir = Path.GetDirectoryName (output);
1224
1225                         // the StrongName key file may be relative to (a) the compiled
1226                         // file or (b) to the output assembly. See bugzilla #55320
1227                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1228
1229                         // (a) relative to the compiled file
1230                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1231                         bool exist = File.Exists (filename);
1232                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1233                                 // (b) relative to the outputed assembly
1234                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1235                                 exist = File.Exists (filename);
1236                         }
1237
1238                         if (exist) {
1239                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1240                                         byte[] snkeypair = new byte [fs.Length];
1241                                         fs.Read (snkeypair, 0, snkeypair.Length);
1242
1243                                         if (RootContext.StrongNameDelaySign) {
1244                                                 // delayed signing - DO NOT include private key
1245                                                 SetPublicKey (an, snkeypair);
1246                                         }
1247                                         else {
1248                                                 // no delay so we make sure we have the private key
1249                                                 try {
1250                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1251                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1252                                                 }
1253                                                 catch (CryptographicException) {
1254                                                         if (snkeypair.Length == 16) {
1255                                                                 // error # is different for ECMA key
1256                                                                 Report.Error (1606, "Could not strongname the assembly. " +
1257                                                                         "ECMA key can only be used to delay-sign assemblies");
1258                                                         }
1259                                                         else {
1260                                                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1261                                                                         RootContext.StrongNameKeyFile +
1262                                                                         "' doesn't have a private key.");
1263                                                         }
1264                                                         return null;
1265                                                 }
1266                                         }
1267                                 }
1268                         }
1269                         else {
1270                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1271                                         RootContext.StrongNameKeyFile + "' not found.");
1272                                 return null;
1273                         }
1274                         return an;
1275                 }
1276
1277                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1278                 {
1279                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1280                                 if (declarative_security == null)
1281                                         declarative_security = new ListDictionary ();
1282
1283                                 a.ExtractSecurityPermissionSet (declarative_security);
1284                                 return;
1285                         }
1286
1287                         Builder.SetCustomAttribute (customBuilder);
1288                 }
1289
1290                 public override void Emit (TypeContainer tc)
1291                 {
1292                         base.Emit (tc);
1293
1294                         if (declarative_security != null) {
1295
1296                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1297                                 object builder_instance = Builder;
1298
1299                                 try {
1300                                         // Microsoft runtime hacking
1301                                         if (add_permission == null) {
1302                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1303                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1304
1305                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1306                                                 builder_instance = fi.GetValue (Builder);
1307                                         }
1308
1309                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1310                                                                                                   declarative_security [SecurityAction.RequestOptional],
1311                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1312                                         add_permission.Invoke (builder_instance, args);
1313                                 }
1314                                 catch {
1315                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1316                                 }
1317                         }
1318                 }
1319
1320                 public override string[] ValidAttributeTargets {
1321                         get {
1322                                 return attribute_targets;
1323                         }
1324                 }
1325         }
1326
1327         public class ModuleClass: CommonAssemblyModulClass {
1328                 // TODO: make it private and move all builder based methods here
1329                 public ModuleBuilder Builder;
1330                 bool m_module_is_unsafe;
1331
1332                 public CharSet DefaultCharSet = CharSet.Ansi;
1333                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1334
1335                 static string[] attribute_targets = new string [] { "module" };
1336
1337                 public ModuleClass (bool is_unsafe)
1338                 {
1339                         m_module_is_unsafe = is_unsafe;
1340                 }
1341
1342                 public override AttributeTargets AttributeTargets {
1343                         get {
1344                                 return AttributeTargets.Module;
1345                         }
1346                 }
1347
1348                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1349                 {
1350                         return CodeGen.Assembly.IsClsCompliant;
1351                 }
1352
1353                 public override void Emit (TypeContainer tc)
1354                 {
1355                         base.Emit (tc);
1356
1357                         if (!m_module_is_unsafe)
1358                                 return;
1359
1360                         if (TypeManager.unverifiable_code_ctor == null) {
1361                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1362                                 return;
1363                         }
1364
1365                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1366                 }
1367
1368                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1369                 {
1370                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1371                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1372                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1373                                 }
1374                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1375                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.Name);
1376                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1377                                         return;
1378                                 }
1379                         }
1380
1381                         Builder.SetCustomAttribute (customBuilder);
1382                 }
1383
1384                 /// <summary>
1385                 /// It is called very early therefore can resolve only predefined attributes
1386                 /// </summary>
1387                 public void ResolveAttributes ()
1388                 {
1389 #if NET_2_0
1390                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1391                         if (a != null) {
1392                                 DefaultCharSet = a.GetCharSetValue ();
1393                                 switch (DefaultCharSet) {
1394                                         case CharSet.Ansi:
1395                                         case CharSet.None:
1396                                                 break;
1397                                         case CharSet.Auto:
1398                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1399                                                 break;
1400                                         case CharSet.Unicode:
1401                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1402                                                 break;
1403                                         default:
1404                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1405                                                 break;
1406                                 }
1407                         }
1408 #endif
1409                 }
1410
1411                 public override string[] ValidAttributeTargets {
1412                         get {
1413                                 return attribute_targets;
1414                         }
1415                 }
1416         }
1417 }