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                         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                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 452                                 throw new InternalErrorException ();
 453
 454                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 455                         MethodIsStatic = IsStatic;
 456                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 457                         RemapToProxy = InIterator;
 458                         ReturnType = return_type;
 459                         IsConstructor = is_constructor;
 460                         CurrentBlock = null;
 461                         CurrentFile = 0;
 462                         current_phase = Phase.Created;
 463
 464                         if (parent != null){
 465                                 // Can only be null for the ResolveType contexts.
 466                                 ContainerType = parent.TypeBuilder;
 467                                 if (parent.UnsafeContext)
 468                                         InUnsafe = true;
 469                                 else
 470                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 471                         }
 472                         loc = l;
 473
 474                         if (ReturnType == TypeManager.void_type)
 475                                 ReturnType = null;
 476                 }
 477
 478                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 479                                     Type return_type, int code_flags, bool is_constructor)
 480                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 481                 {
 482                 }
 483
 484                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 485                                     Type return_type, int code_flags)
 486                         : this (tc, tc, l, ig, return_type, code_flags, false)
 487                 {
 488                 }
 489
 490                 public FlowBranching CurrentBranching {
 491                         get {
 492                                 return current_flow_branching;
 493                         }
 494                 }
 495
 496                 public bool HaveCaptureInfo {
 497                         get {
 498                                 return capture_context != null;
 499                         }
 500                 }
 501
 502                 // <summary>
 503                 //   Starts a new code branching.  This inherits the state of all local
 504                 //   variables and parameters from the current branching.
 505                 // </summary>
 506                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 507                 {
 508                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 509                         return current_flow_branching;
 510                 }
 511
 512                 // <summary>
 513                 //   Starts a new code branching for block `block'.
 514                 // </summary>
 515                 public FlowBranching StartFlowBranching (Block block)
 516                 {
 517                         FlowBranching.BranchingType type;
 518
 519                         if (CurrentBranching.Type == FlowBranching.BranchingType.Switch)
 520                                 type = FlowBranching.BranchingType.SwitchSection;
 521                         else
 522                                 type = FlowBranching.BranchingType.Block;
 523
 524                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, block, block.StartLocation);
 525                         return current_flow_branching;
 526                 }
 527
 528                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 529                 {
 530                         FlowBranchingException branching = new FlowBranchingException (
 531                                 CurrentBranching, stmt);
 532                         current_flow_branching = branching;
 533                         return branching;
 534                 }
 535
 536                 // <summary>
 537                 //   Ends a code branching.  Merges the state of locals and parameters
 538                 //   from all the children of the ending branching.
 539                 // </summary>
 540                 public FlowBranching.UsageVector DoEndFlowBranching ()
 541                 {
 542                         FlowBranching old = current_flow_branching;
 543                         current_flow_branching = current_flow_branching.Parent;
 544
 545                         return current_flow_branching.MergeChild (old);
 546                 }
 547
 548                 // <summary>
 549                 //   Ends a code branching.  Merges the state of locals and parameters
 550                 //   from all the children of the ending branching.
 551                 // </summary>
 552                 public FlowBranching.Reachability EndFlowBranching ()
 553                 {
 554                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 555
 556                         return vector.Reachability;
 557                 }
 558
 559                 // <summary>
 560                 //   Kills the current code branching.  This throws away any changed state
 561                 //   information and should only be used in case of an error.
 562                 // </summary>
 563                 public void KillFlowBranching ()
 564                 {
 565                         current_flow_branching = current_flow_branching.Parent;
 566                 }
 567
 568                 public void CaptureVariable (LocalInfo li)
 569                 {
 570                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 571                         li.IsCaptured = true;
 572                 }
 573
 574                 public void CaptureParameter (string name, Type t, int idx)
 575                 {
 576                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 577                 }
 578
 579                 public void CaptureThis ()
 580                 {
 581                         capture_context.CaptureThis ();
 582                 }
 583
 584
 585                 //
 586                 // Use to register a field as captured
 587                 //
 588                 public void CaptureField (FieldExpr fe)
 589                 {
 590                         capture_context.AddField (fe);
 591                 }
 592
 593                 //
 594                 // Whether anonymous methods have captured variables
 595                 //
 596                 public bool HaveCapturedVariables ()
 597                 {
 598                         if (capture_context != null)
 599                                 return capture_context.HaveCapturedVariables;
 600                         return false;
 601                 }
 602
 603                 //
 604                 // Whether anonymous methods have captured fields or this.
 605                 //
 606                 public bool HaveCapturedFields ()
 607                 {
 608                         if (capture_context != null)
 609                                 return capture_context.HaveCapturedFields;
 610                         return false;
 611                 }
 612
 613                 //
 614                 // Emits the instance pointer for the host method
 615                 //
 616                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 617                 {
 618                         if (capture_context != null)
 619                                 capture_context.EmitMethodHostInstance (target, am);
 620                         else if (IsStatic)
 621                                 target.ig.Emit (OpCodes.Ldnull);
 622                         else
 623                                 target.ig.Emit (OpCodes.Ldarg_0);
 624                 }
 625
 626                 //
 627                 // Returns whether the `local' variable has been captured by an anonymous
 628                 // method
 629                 //
 630                 public bool IsCaptured (LocalInfo local)
 631                 {
 632                         return capture_context.IsCaptured (local);
 633                 }
 634
 635                 public bool IsParameterCaptured (string name)
 636                 {
 637                         if (capture_context != null)
 638                                 return capture_context.IsParameterCaptured (name);
 639                         return false;
 640                 }
 641
 642                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 643                 {
 644                         if (capture_context != null)
 645                                 capture_context.EmitAnonymousHelperClasses (this);
 646                         b.EmitMeta (this);
 647
 648                         if (HasReturnLabel)
 649                                 ReturnLabel = ig.DefineLabel ();
 650                 }
 651
 652                 //
 653                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 654                 // currently can not cope with ig == null during resolve (which must
 655                 // be fixed for switch statements to work on anonymous methods).
 656                 //
 657                 public void EmitTopBlock (ToplevelBlock block, InternalParameters ip, Location loc)
 658                 {
 659                         if (block == null)
 660                                 return;
 661
 662                         bool unreachable;
 663
 664                         if (ResolveTopBlock (null, block, ip, loc, out unreachable)){
 665                                 EmitMeta (block, ip);
 666
 667                                 current_phase = Phase.Emitting;
 668                                 EmitResolvedTopBlock (block, unreachable);
 669                         }
 670                 }
 671
 672                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 673                                              InternalParameters ip, Location loc, out bool unreachable)
 674                 {
 675                         current_phase = Phase.Resolving;
 676
 677                         unreachable = false;
 678
 679                         capture_context = block.CaptureContext;
 680
 681                         if (!Location.IsNull (loc))
 682                                 CurrentFile = loc.File;
 683
 684 #if PRODUCTION
 685                             try {
 686 #endif
 687                                 int errors = Report.Errors;
 688
 689                                 block.ResolveMeta (block, this, ip);
 690                                 if (Report.Errors != errors)
 691                                         return false;
 692
 693                                 bool old_do_flow_analysis = DoFlowAnalysis;
 694                                 DoFlowAnalysis = true;
 695
 696                                 if (anonymous_method_host != null)
 697                                         current_flow_branching = FlowBranching.CreateBranching (
 698                                                 anonymous_method_host.CurrentBranching, FlowBranching.BranchingType.Block,
 699                                                 block, loc);
 700                                 else
 701                                         current_flow_branching = FlowBranching.CreateBranching (
 702                                                 null, FlowBranching.BranchingType.Block, block, loc);
 703
 704                                 if (!block.Resolve (this)) {
 705                                         current_flow_branching = null;
 706                                         DoFlowAnalysis = old_do_flow_analysis;
 707                                         return false;
 708                                 }
 709
 710                                 FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 711                                 current_flow_branching = null;
 712
 713                                 DoFlowAnalysis = old_do_flow_analysis;
 714
 715                                 if (reachability.AlwaysReturns ||
 716                                     reachability.AlwaysThrows ||
 717                                     reachability.IsUnreachable)
 718                                         unreachable = true;
 719 #if PRODUCTION
 720                             } catch (Exception e) {
 721                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 722                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 723
 724                                         if (CurrentBlock != null){
 725                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 726                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 727                                         }
 728                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 729                                 throw;
 730                         }
 731 #endif
 732
 733                         if (ReturnType != null && !unreachable){
 734                                 if (!InIterator){
 735                                         if (CurrentAnonymousMethod != null){
 736                                                 Report.Error (1643, loc, "Not all code paths return a value in anonymous method of type `{0}'",
 737                                                               CurrentAnonymousMethod.Type);
 738                                         } else {
 739                                         Report.Error (161, loc, "Not all code paths return a value");
 740                                         }
 741
 742                                         return false;
 743                                 }
 744                         }
 745                         block.CompleteContexts ();
 746
 747                         return true;
 748                 }
 749
 750                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 751                 {
 752                         if (block != null)
 753                                 block.Emit (this);
 754
 755                         if (HasReturnLabel)
 756                                 ig.MarkLabel (ReturnLabel);
 757
 758                         if (return_value != null){
 759                                 ig.Emit (OpCodes.Ldloc, return_value);
 760                                 ig.Emit (OpCodes.Ret);
 761                         } else {
 762                                 //
 763                                 // If `HasReturnLabel' is set, then we already emitted a
 764                                 // jump to the end of the method, so we must emit a `ret'
 765                                 // there.
 766                                 //
 767                                 // Unfortunately, System.Reflection.Emit automatically emits
 768                                 // a leave to the end of a finally block.  This is a problem
 769                                 // if no code is following the try/finally block since we may
 770                                 // jump to a point after the end of the method.
 771                                 // As a workaround, we're always creating a return label in
 772                                 // this case.
 773                                 //
 774
 775                                 if ((block != null) && block.IsDestructor) {
 776                                         // Nothing to do; S.R.E automatically emits a leave.
 777                                 } else if (HasReturnLabel || (!unreachable && !InIterator)) {
 778                                         if (ReturnType != null)
 779                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 780                                         ig.Emit (OpCodes.Ret);
 781                                 }
 782                         }
 783
 784                         //
 785                         // Close pending helper classes if we are the toplevel
 786                         //
 787                         if (capture_context != null && capture_context.ParentToplevel == null)
 788                                 capture_context.CloseAnonymousHelperClasses ();
 789                 }
 790
 791                 /// <summary>
 792                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 793                 ///   writer to which source line this opcode belongs.
 794                 /// </summary>
 795                 public void Mark (Location loc, bool check_file)
 796                 {
 797                         if ((CodeGen.SymbolWriter == null) || Location.IsNull (loc))
 798                                 return;
 799
 800                         if (check_file && (CurrentFile != loc.File))
 801                                 return;
 802
 803                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, 0);
 804                 }
 805
 806                 public void DefineLocalVariable (string name, LocalBuilder builder)
 807                 {
 808                         if (CodeGen.SymbolWriter == null)
 809                                 return;
 810
 811                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 812                 }
 813
 814                 public void BeginScope ()
 815                 {
 816                         ig.BeginScope();
 817
 818                         if (CodeGen.SymbolWriter != null)
 819                                 CodeGen.SymbolWriter.OpenScope(ig);
 820                 }
 821
 822                 public void EndScope ()
 823                 {
 824                         ig.EndScope();
 825
 826                         if (CodeGen.SymbolWriter != null)
 827                                 CodeGen.SymbolWriter.CloseScope(ig);
 828                 }
 829
 830                 /// <summary>
 831                 ///   Returns a temporary storage for a variable of type t as
 832                 ///   a local variable in the current body.
 833                 /// </summary>
 834                 public LocalBuilder GetTemporaryLocal (Type t)
 835                 {
 836                         LocalBuilder location = null;
 837
 838                         if (temporary_storage != null){
 839                                 object o = temporary_storage [t];
 840                                 if (o != null){
 841                                         if (o is ArrayList){
 842                                                 ArrayList al = (ArrayList) o;
 843
 844                                                 for (int i = 0; i < al.Count; i++){
 845                                                         if (al [i] != null){
 846                                                                 location = (LocalBuilder) al [i];
 847                                                                 al [i] = null;
 848                                                                 break;
 849                                                         }
 850                                                 }
 851                                         } else
 852                                                 location = (LocalBuilder) o;
 853                                         if (location != null)
 854                                                 return location;
 855                                 }
 856                         }
 857
 858                         return ig.DeclareLocal (t);
 859                 }
 860
 861                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 862                 {
 863                         if (temporary_storage == null){
 864                                 temporary_storage = new Hashtable ();
 865                                 temporary_storage [t] = b;
 866                                 return;
 867                         }
 868                         object o = temporary_storage [t];
 869                         if (o == null){
 870                                 temporary_storage [t] = b;
 871                                 return;
 872                         }
 873                         if (o is ArrayList){
 874                                 ArrayList al = (ArrayList) o;
 875                                 for (int i = 0; i < al.Count; i++){
 876                                         if (al [i] == null){
 877                                                 al [i] = b;
 878                                                 return;
 879                                         }
 880                                 }
 881                                 al.Add (b);
 882                                 return;
 883                         }
 884                         ArrayList replacement = new ArrayList ();
 885                         replacement.Add (o);
 886                         temporary_storage.Remove (t);
 887                         temporary_storage [t] = replacement;
 888                 }
 889
 890                 /// <summary>
 891                 ///   Current loop begin and end labels.
 892                 /// </summary>
 893                 public Label LoopBegin, LoopEnd;
 894
 895                 /// <summary>
 896                 ///   Default target in a switch statement.   Only valid if
 897                 ///   InSwitch is true
 898                 /// </summary>
 899                 public Label DefaultTarget;
 900
 901                 /// <summary>
 902                 ///   If this is non-null, points to the current switch statement
 903                 /// </summary>
 904                 public Switch Switch;
 905
 906                 /// <summary>
 907                 ///   ReturnValue creates on demand the LocalBuilder for the
 908                 ///   return value from the function.  By default this is not
 909                 ///   used.  This is only required when returns are found inside
 910                 ///   Try or Catch statements.
 911                 ///
 912                 ///   This method is typically invoked from the Emit phase, so
 913                 ///   we allow the creation of a return label if it was not
 914                 ///   requested during the resolution phase.   Could be cleaned
 915                 ///   up, but it would replicate a lot of logic in the Emit phase
 916                 ///   of the code that uses it.
 917                 /// </summary>
 918                 public LocalBuilder TemporaryReturn ()
 919                 {
 920                         if (return_value == null){
 921                                 return_value = ig.DeclareLocal (ReturnType);
 922                                 if (!HasReturnLabel){
 923                                 ReturnLabel = ig.DefineLabel ();
 924                                 HasReturnLabel = true;
 925                         }
 926                         }
 927
 928                         return return_value;
 929                 }
 930
 931                 /// <summary>
 932                 ///   This method is used during the Resolution phase to flag the
 933                 ///   need to define the ReturnLabel
 934                 /// </summary>
 935                 public void NeedReturnLabel ()
 936                 {
 937                         if (current_phase != Phase.Resolving){
 938                                 //
 939                                 // The reason is that the `ReturnLabel' is declared between
 940                                 // resolution and emission
 941                                 //
 942                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 943                         }
 944
 945                         if (!InIterator && !HasReturnLabel)
 946                                 HasReturnLabel = true;
 947                         }
 948
 949                 //
 950                 // Creates a field `name' with the type `t' on the proxy class
 951                 //
 952                 public FieldBuilder MapVariable (string name, Type t)
 953                 {
 954                         if (InIterator)
 955                                 return CurrentIterator.MapVariable ("v_", name, t);
 956
 957                         throw new Exception ("MapVariable for an unknown state");
 958                 }
 959
 960                 public Expression RemapParameter (int idx)
 961                 {
 962                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 963                         fe.InstanceExpression = new ProxyInstance ();
 964                         return fe.DoResolve (this);
 965                 }
 966
 967                 public Expression RemapParameterLValue (int idx, Expression right_side)
 968                 {
 969                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 970                         fe.InstanceExpression = new ProxyInstance ();
 971                         return fe.DoResolveLValue (this, right_side);
 972                 }
 973
 974                 //
 975                 // Emits the proper object to address fields on a remapped
 976                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 977                 //
 978                 public void EmitThis ()
 979                 {
 980                         ig.Emit (OpCodes.Ldarg_0);
 981                         if (InIterator){
 982                                 if (!IsStatic){
 983                                 FieldBuilder this_field = CurrentIterator.this_field.FieldBuilder;
 984                                 if (TypeManager.IsValueType (this_field.FieldType))
 985                                         ig.Emit (OpCodes.Ldflda, this_field);
 986                                 else
 987                                         ig.Emit (OpCodes.Ldfld, this_field);
 988                         }
 989                         } else if (capture_context != null && CurrentAnonymousMethod != null){
 990                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 991                                 while (si != null){
 992                                         if (si.ParentLink != null)
 993                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 994                                         if (si.THIS != null){
 995                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 996                                                 break;
 997                                         }
 998                                         si = si.ParentScope;
 999                                 }
1000                         }
1001                 }
1002
1003                 //
1004                 // Emits the code necessary to load the instance required
1005                 // to access the captured LocalInfo
1006                 //
1007                 public void EmitCapturedVariableInstance (LocalInfo li)
1008                 {
1009                         if (RemapToProxy){
1010                                 ig.Emit (OpCodes.Ldarg_0);
1011                                 return;
1012                         }
1013
1014                         if (capture_context == null)
1015                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
1016
1017                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1018                 }
1019
1020                 public void EmitParameter (string name)
1021                 {
1022                         capture_context.EmitParameter (this, name);
1023                 }
1024
1025                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
1026                 {
1027                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
1028                 }
1029
1030                 public void EmitAddressOfParameter (string name)
1031                 {
1032                         capture_context.EmitAddressOfParameter (this, name);
1033                 }
1034
1035                 public Expression GetThis (Location loc)
1036                 {
1037                         This my_this;
1038                         if (CurrentBlock != null)
1039                                 my_this = new This (CurrentBlock, loc);
1040                         else
1041                                 my_this = new This (loc);
1042
1043                         if (!my_this.ResolveBase (this))
1044                                 my_this = null;
1045
1046                         return my_this;
1047                 }
1048         }
1049
1050
1051         public abstract class CommonAssemblyModulClass: Attributable {
1052                 protected CommonAssemblyModulClass ():
1053                         base (null)
1054                 {
1055                 }
1056
1057                 public void AddAttributes (ArrayList attrs)
1058                 {
1059                         if (OptAttributes == null) {
1060                                 OptAttributes = new Attributes (attrs);
1061                                 return;
1062                         }
1063                         OptAttributes.AddAttributes (attrs);
1064                 }
1065
1066                 public virtual void Emit (TypeContainer tc)
1067                 {
1068                         if (OptAttributes == null)
1069                                 return;
1070
1071                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
1072                         OptAttributes.Emit (ec, this);
1073                 }
1074
1075                 protected Attribute ResolveAttribute (Type a_type)
1076                 {
1077                         if (OptAttributes == null)
1078                                 return null;
1079
1080                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1081                         if (!OptAttributes.CheckTargets (this))
1082                                 return null;
1083
1084                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1085                         Attribute a = OptAttributes.Search (a_type, temp_ec);
1086                         if (a != null) {
1087                                 a.Resolve (temp_ec);
1088                         }
1089                         return a;
1090                 }
1091         }
1092
1093         public class AssemblyClass: CommonAssemblyModulClass {
1094                 // TODO: make it private and move all builder based methods here
1095                 public AssemblyBuilder Builder;
1096
1097                 bool is_cls_compliant;
1098                 public Attribute ClsCompliantAttribute;
1099
1100                 ListDictionary declarative_security;
1101
1102                 static string[] attribute_targets = new string [] { "assembly" };
1103
1104                 public AssemblyClass (): base ()
1105                 {
1106                         is_cls_compliant = false;
1107                 }
1108
1109                 public bool IsClsCompliant {
1110                         get {
1111                                 return is_cls_compliant;
1112                         }
1113                         }
1114
1115                 public override AttributeTargets AttributeTargets {
1116                         get {
1117                                 return AttributeTargets.Assembly;
1118                         }
1119                 }
1120
1121                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1122                 {
1123                         return is_cls_compliant;
1124                 }
1125
1126                 public void ResolveClsCompliance ()
1127                 {
1128                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1129                         if (ClsCompliantAttribute == null)
1130                                 return;
1131
1132                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1133                 }
1134
1135                 // fix bug #56621
1136                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1137                 {
1138                         try {
1139                                 // check for possible ECMA key
1140                                 if (strongNameBlob.Length == 16) {
1141                                         // will be rejected if not "the" ECMA key
1142                                         an.SetPublicKey (strongNameBlob);
1143                                 }
1144                                 else {
1145                                         // take it, with or without, a private key
1146                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1147                                         // and make sure we only feed the public part to Sys.Ref
1148                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1149
1150                                         // AssemblyName.SetPublicKey requires an additional header
1151                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1152
1153                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1154                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1155                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1156                                         an.SetPublicKey (encodedPublicKey);
1157                                 }
1158                         }
1159                         catch (Exception) {
1160                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1161                                         RootContext.StrongNameKeyFile + "' incorrectly encoded.");
1162                                 Environment.Exit (1);
1163                         }
1164                 }
1165
1166                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1167                 public AssemblyName GetAssemblyName (string name, string output)
1168                 {
1169                         if (OptAttributes != null) {
1170                                foreach (Attribute a in OptAttributes.Attrs) {
1171                                        // cannot rely on any resolve-based members before you call Resolve
1172                                        if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1173                                                continue;
1174
1175                                        // TODO: This code is buggy: comparing Attribute name without resolving it is wrong.
1176                                        //       However, this is invoked by CodeGen.Init, at which time none of the namespaces
1177                                        //       are loaded yet.
1178                                         switch (a.Name) {
1179                                                 case "AssemblyKeyFile":
1180                                                case "AssemblyKeyFileAttribute":
1181                                                case "System.Reflection.AssemblyKeyFileAttribute":
1182                                                         if (RootContext.StrongNameKeyFile != null) {
1183                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1184                                                                 Report.Warning (1616, "Compiler option '{0}' overrides '{1}' given in source", "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1185                                                         }
1186                                                         else {
1187                                                                 string value = a.GetString ();
1188                                                                 if (value != String.Empty)
1189                                                                         RootContext.StrongNameKeyFile = value;
1190                                                         }
1191                                                         break;
1192                                                 case "AssemblyKeyName":
1193                                                case "AssemblyKeyNameAttribute":
1194                                                case "System.Reflection.AssemblyKeyNameAttribute":
1195                                                         if (RootContext.StrongNameKeyContainer != null) {
1196                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1197                                                                 Report.Warning (1616, "keycontainer", "Compiler option '{0}' overrides '{1}' given in source", "System.Reflection.AssemblyKeyNameAttribute");
1198                                                         }
1199                                                         else {
1200                                                                 string value = a.GetString ();
1201                                                                 if (value != String.Empty)
1202                                                                         RootContext.StrongNameKeyContainer = value;
1203                                                         }
1204                                                         break;
1205                                                 case "AssemblyDelaySign":
1206                                                case "AssemblyDelaySignAttribute":
1207                                                case "System.Reflection.AssemblyDelaySignAttribute":
1208                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1209                                                         break;
1210                                         }
1211                                 }
1212                         }
1213
1214                         AssemblyName an = new AssemblyName ();
1215                         an.Name = Path.GetFileNameWithoutExtension (name);
1216
1217                         // note: delay doesn't apply when using a key container
1218                         if (RootContext.StrongNameKeyContainer != null) {
1219                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1220                                 return an;
1221                         }
1222
1223                         // strongname is optional
1224                         if (RootContext.StrongNameKeyFile == null)
1225                                 return an;
1226
1227                         string AssemblyDir = Path.GetDirectoryName (output);
1228
1229                         // the StrongName key file may be relative to (a) the compiled
1230                         // file or (b) to the output assembly. See bugzilla #55320
1231                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1232
1233                         // (a) relative to the compiled file
1234                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1235                         bool exist = File.Exists (filename);
1236                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1237                                 // (b) relative to the outputed assembly
1238                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1239                                 exist = File.Exists (filename);
1240                         }
1241
1242                         if (exist) {
1243                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1244                                         byte[] snkeypair = new byte [fs.Length];
1245                                         fs.Read (snkeypair, 0, snkeypair.Length);
1246
1247                                         if (RootContext.StrongNameDelaySign) {
1248                                                 // delayed signing - DO NOT include private key
1249                                                 SetPublicKey (an, snkeypair);
1250                                         }
1251                                         else {
1252                                                 // no delay so we make sure we have the private key
1253                                                 try {
1254                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1255                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1256                                                 }
1257                                                 catch (CryptographicException) {
1258                                                         if (snkeypair.Length == 16) {
1259                                                                 // error # is different for ECMA key
1260                                                                 Report.Error (1606, "Could not strongname the assembly. " +
1261                                                                         "ECMA key can only be used to delay-sign assemblies");
1262                                                         }
1263                                                         else {
1264                                                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1265                                                                         RootContext.StrongNameKeyFile +
1266                                                                         "' doesn't have a private key.");
1267                                                         }
1268                                                         return null;
1269                                                 }
1270                                         }
1271                                 }
1272                         }
1273                         else {
1274                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1275                                         RootContext.StrongNameKeyFile + "' not found.");
1276                                 return null;
1277                         }
1278                         return an;
1279                 }
1280
1281                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1282                 {
1283                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1284                                 if (declarative_security == null)
1285                                         declarative_security = new ListDictionary ();
1286
1287                                 a.ExtractSecurityPermissionSet (declarative_security);
1288                                 return;
1289                         }
1290
1291                         Builder.SetCustomAttribute (customBuilder);
1292                 }
1293
1294                 public override void Emit (TypeContainer tc)
1295                 {
1296                         base.Emit (tc);
1297
1298                         if (declarative_security != null) {
1299
1300                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1301                                 object builder_instance = Builder;
1302
1303                                 try {
1304                                         // Microsoft runtime hacking
1305                                         if (add_permission == null) {
1306                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1307                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1308
1309                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1310                                                 builder_instance = fi.GetValue (Builder);
1311                                         }
1312
1313                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1314                                                                                                   declarative_security [SecurityAction.RequestOptional],
1315                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1316                                         add_permission.Invoke (builder_instance, args);
1317                                 }
1318                                 catch {
1319                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1320                                 }
1321                         }
1322                 }
1323
1324                 public override string[] ValidAttributeTargets {
1325                         get {
1326                                 return attribute_targets;
1327                         }
1328                 }
1329         }
1330
1331         public class ModuleClass: CommonAssemblyModulClass {
1332                 // TODO: make it private and move all builder based methods here
1333                 public ModuleBuilder Builder;
1334                 bool m_module_is_unsafe;
1335
1336                 public CharSet DefaultCharSet = CharSet.Ansi;
1337                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1338
1339                 static string[] attribute_targets = new string [] { "module" };
1340
1341                 public ModuleClass (bool is_unsafe)
1342                 {
1343                         m_module_is_unsafe = is_unsafe;
1344                 }
1345
1346                 public override AttributeTargets AttributeTargets {
1347                         get {
1348                                 return AttributeTargets.Module;
1349                         }
1350                 }
1351
1352                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1353                 {
1354                         return CodeGen.Assembly.IsClsCompliant;
1355                         }
1356
1357                 public override void Emit (TypeContainer tc)
1358                 {
1359                         base.Emit (tc);
1360
1361                         if (!m_module_is_unsafe)
1362                                 return;
1363
1364                         if (TypeManager.unverifiable_code_ctor == null) {
1365                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1366                                 return;
1367                         }
1368
1369                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1370                 }
1371
1372                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1373                 {
1374                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1375                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1376                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1377                                 }
1378                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1379                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.Name);
1380                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1381                                         return;
1382                                 }
1383                         }
1384
1385                         Builder.SetCustomAttribute (customBuilder);
1386                 }
1387
1388                 /// <summary>
1389                 /// It is called very early therefore can resolve only predefined attributes
1390                 /// </summary>
1391                 public void ResolveAttributes ()
1392                 {
1393                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1394                         if (a != null) {
1395                                 DefaultCharSet = a.GetCharSetValue ();
1396                                 switch (DefaultCharSet) {
1397                                         case CharSet.Ansi:
1398                                         case CharSet.None:
1399                                                 break;
1400                                         case CharSet.Auto:
1401                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1402                                                 break;
1403                                         case CharSet.Unicode:
1404                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1405                                                 break;
1406                                         default:
1407                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1408                                                 break;
1409                                 }
1410                         }
1411                 }
1412
1413                 public override string[] ValidAttributeTargets {
1414                         get {
1415                                 return attribute_targets;
1416                         }
1417                 }
1418         }
1419 }