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 InCatch;
 387                 public bool InFinally;
 388
 389                 /// <summary>
 390                 ///  Whether we are inside an anonymous method.
 391                 /// </summary>
 392                 public AnonymousMethod CurrentAnonymousMethod;
 393
 394                 /// <summary>
 395                 ///   Location for this EmitContext
 396                 /// </summary>
 397                 public Location loc;
 398
 399                 /// <summary>
 400                 ///   Inside an enum definition, we do not resolve enumeration values
 401                 ///   to their enumerations, but rather to the underlying type/value
 402                 ///   This is so EnumVal + EnumValB can be evaluated.
 403                 ///
 404                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 405                 ///   we relax the rules
 406                 /// </summary>
 407                 public bool InEnumContext;
 408
 409                 /// <summary>
 410                 ///   Anonymous methods can capture local variables and fields,
 411                 ///   this object tracks it.  It is copied from the TopLevelBlock
 412                 ///   field.
 413                 /// </summary>
 414                 public CaptureContext capture_context;
 415
 416                 /// <summary>
 417                 /// Trace when method is called and is obsolete then this member suppress message
 418                 /// when call is inside next [Obsolete] method or type.
 419                 /// </summary>
 420                 public bool TestObsoleteMethodUsage = true;
 421
 422                 /// <summary>
 423                 ///    The current iterator
 424                 /// </summary>
 425                 public Iterator CurrentIterator;
 426
 427                 /// <summary>
 428                 ///    Whether we are in the resolving stage or not
 429                 /// </summary>
 430                 enum Phase {
 431                         Created,
 432                         Resolving,
 433                         Emitting
 434                 }
 435
 436                 Phase current_phase;
 437                 FlowBranching current_flow_branching;
 438
 439                 public EmitContext (DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 440                                     Type return_type, int code_flags, bool is_constructor)
 441                 {
 442                         this.ig = ig;
 443
 444                         TypeContainer = parent;
 445                         DeclSpace = ds;
 446                         CheckState = RootContext.Checked;
 447                         ConstantCheckState = true;
 448
 449                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 450                         MethodIsStatic = IsStatic;
 451                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 452                         RemapToProxy = InIterator;
 453                         ReturnType = return_type;
 454                         IsConstructor = is_constructor;
 455                         CurrentBlock = null;
 456                         CurrentFile = 0;
 457                         current_phase = Phase.Created;
 458
 459                         if (parent != null){
 460                                 // Can only be null for the ResolveType contexts.
 461                                 ContainerType = parent.TypeBuilder;
 462                                 if (parent.UnsafeContext)
 463                                         InUnsafe = true;
 464                                 else
 465                                         InUnsafe = (code_flags & Modifiers.UNSAFE) != 0;
 466                         }
 467                         loc = l;
 468
 469                         if (ReturnType == TypeManager.void_type)
 470                                 ReturnType = null;
 471                 }
 472
 473                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 474                                     Type return_type, int code_flags, bool is_constructor)
 475                         : this (tc, tc, l, ig, return_type, code_flags, is_constructor)
 476                 {
 477                 }
 478
 479                 public EmitContext (TypeContainer tc, Location l, ILGenerator ig,
 480                                     Type return_type, int code_flags)
 481                         : this (tc, tc, l, ig, return_type, code_flags, false)
 482                 {
 483                 }
 484
 485                 public FlowBranching CurrentBranching {
 486                         get {
 487                                 return current_flow_branching;
 488                         }
 489                 }
 490
 491                 public bool HaveCaptureInfo {
 492                         get {
 493                                 return capture_context != null;
 494                         }
 495                 }
 496
 497                 // <summary>
 498                 //   Starts a new code branching.  This inherits the state of all local
 499                 //   variables and parameters from the current branching.
 500                 // </summary>
 501                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 502                 {
 503                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 504                         return current_flow_branching;
 505                 }
 506
 507                 // <summary>
 508                 //   Starts a new code branching for block `block'.
 509                 // </summary>
 510                 public FlowBranching StartFlowBranching (Block block)
 511                 {
 512                         FlowBranching.BranchingType type;
 513
 514                         if (CurrentBranching.Type == FlowBranching.BranchingType.Switch)
 515                                 type = FlowBranching.BranchingType.SwitchSection;
 516                         else
 517                                 type = FlowBranching.BranchingType.Block;
 518
 519                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, block, block.StartLocation);
 520                         return current_flow_branching;
 521                 }
 522
 523                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 524                 {
 525                         FlowBranchingException branching = new FlowBranchingException (
 526                                 CurrentBranching, stmt);
 527                         current_flow_branching = branching;
 528                         return branching;
 529                 }
 530
 531                 // <summary>
 532                 //   Ends a code branching.  Merges the state of locals and parameters
 533                 //   from all the children of the ending branching.
 534                 // </summary>
 535                 public FlowBranching.UsageVector DoEndFlowBranching ()
 536                 {
 537                         FlowBranching old = current_flow_branching;
 538                         current_flow_branching = current_flow_branching.Parent;
 539
 540                         return current_flow_branching.MergeChild (old);
 541                 }
 542
 543                 // <summary>
 544                 //   Ends a code branching.  Merges the state of locals and parameters
 545                 //   from all the children of the ending branching.
 546                 // </summary>
 547                 public FlowBranching.Reachability EndFlowBranching ()
 548                 {
 549                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 550
 551                         return vector.Reachability;
 552                 }
 553
 554                 // <summary>
 555                 //   Kills the current code branching.  This throws away any changed state
 556                 //   information and should only be used in case of an error.
 557                 // </summary>
 558                 public void KillFlowBranching ()
 559                 {
 560                         current_flow_branching = current_flow_branching.Parent;
 561                 }
 562
 563                 public void CaptureVariable (LocalInfo li)
 564                 {
 565                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 566                         li.IsCaptured = true;
 567                 }
 568
 569                 public void CaptureParameter (string name, Type t, int idx)
 570                 {
 571                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 572                 }
 573
 574                 public void CaptureThis ()
 575                 {
 576                         capture_context.CaptureThis ();
 577                 }
 578
 579
 580                 //
 581                 // Use to register a field as captured
 582                 //
 583                 public void CaptureField (FieldExpr fe)
 584                 {
 585                         capture_context.AddField (fe);
 586                 }
 587
 588                 //
 589                 // Whether anonymous methods have captured variables
 590                 //
 591                 public bool HaveCapturedVariables ()
 592                 {
 593                         if (capture_context != null)
 594                                 return capture_context.HaveCapturedVariables;
 595                         return false;
 596                 }
 597
 598                 //
 599                 // Whether anonymous methods have captured fields or this.
 600                 //
 601                 public bool HaveCapturedFields ()
 602                 {
 603                         if (capture_context != null)
 604                                 return capture_context.HaveCapturedFields;
 605                         return false;
 606                 }
 607
 608                 //
 609                 // Emits the instance pointer for the host method
 610                 //
 611                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 612                 {
 613                         if (capture_context != null)
 614                                 capture_context.EmitMethodHostInstance (target, am);
 615                         else if (IsStatic)
 616                                 target.ig.Emit (OpCodes.Ldnull);
 617                         else
 618                                 target.ig.Emit (OpCodes.Ldarg_0);
 619                 }
 620
 621                 //
 622                 // Returns whether the `local' variable has been captured by an anonymous
 623                 // method
 624                 //
 625                 public bool IsCaptured (LocalInfo local)
 626                 {
 627                         return capture_context.IsCaptured (local);
 628                 }
 629
 630                 public bool IsParameterCaptured (string name)
 631                 {
 632                         if (capture_context != null)
 633                                 return capture_context.IsParameterCaptured (name);
 634                         return false;
 635                 }
 636
 637                 public void EmitMeta (ToplevelBlock b, InternalParameters ip)
 638                 {
 639                         if (capture_context != null)
 640                                 capture_context.EmitAnonymousHelperClasses (this);
 641                         b.EmitMeta (this);
 642
 643                         if (HasReturnLabel)
 644                                 ReturnLabel = ig.DefineLabel ();
 645                 }
 646
 647                 //
 648                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 649                 // currently can not cope with ig == null during resolve (which must
 650                 // be fixed for switch statements to work on anonymous methods).
 651                 //
 652                 public void EmitTopBlock (ToplevelBlock block, InternalParameters ip, Location loc)
 653                 {
 654                         if (block == null)
 655                                 return;
 656
 657                         bool unreachable;
 658
 659                         if (ResolveTopBlock (null, block, ip, loc, out unreachable)){
 660                                 EmitMeta (block, ip);
 661
 662                                 current_phase = Phase.Emitting;
 663                                 EmitResolvedTopBlock (block, unreachable);
 664                         }
 665                 }
 666
 667                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 668                                              InternalParameters ip, Location loc, out bool unreachable)
 669                 {
 670                         current_phase = Phase.Resolving;
 671
 672                         unreachable = false;
 673
 674                         capture_context = block.CaptureContext;
 675
 676                         if (!Location.IsNull (loc))
 677                                 CurrentFile = loc.File;
 678
 679 #if PRODUCTION
 680                         try {
 681 #endif
 682                                 int errors = Report.Errors;
 683
 684                                 block.ResolveMeta (block, this, ip);
 685                                 if (Report.Errors != errors)
 686                                         return false;
 687
 688                                         bool old_do_flow_analysis = DoFlowAnalysis;
 689                                         DoFlowAnalysis = true;
 690
 691                                         if (anonymous_method_host != null)
 692                                                 current_flow_branching = FlowBranching.CreateBranching (
 693                                                 anonymous_method_host.CurrentBranching, FlowBranching.BranchingType.Block,
 694                                                 block, loc);
 695                                         else
 696                                                 current_flow_branching = FlowBranching.CreateBranching (
 697                                                         null, FlowBranching.BranchingType.Block, block, loc);
 698
 699                                         if (!block.Resolve (this)) {
 700                                                 current_flow_branching = null;
 701                                                 DoFlowAnalysis = old_do_flow_analysis;
 702                                                 return false;
 703                                         }
 704
 705                                         FlowBranching.Reachability reachability = current_flow_branching.MergeTopBlock ();
 706                                         current_flow_branching = null;
 707
 708                                         DoFlowAnalysis = old_do_flow_analysis;
 709
 710                                         if (reachability.AlwaysReturns ||
 711                                             reachability.AlwaysThrows ||
 712                                             reachability.IsUnreachable)
 713                                                 unreachable = true;
 714 #if PRODUCTION
 715                         } catch (Exception e) {
 716                                         Console.WriteLine ("Exception caught by the compiler while compiling:");
 717                                         Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 718
 719                                         if (CurrentBlock != null){
 720                                                 Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 721                                                                    CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 722                                         }
 723                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 724                                         throw;
 725                         }
 726 #endif
 727
 728                         if (ReturnType != null && !unreachable){
 729                                 if (!InIterator){
 730                                         if (CurrentAnonymousMethod != null){
 731                                                 Report.Error (1643, loc, "Not all code paths return a value in anonymous method of type `{0}'",
 732                                                               CurrentAnonymousMethod.Type);
 733                                         } else {
 734                                                 Report.Error (161, loc, "Not all code paths return a value");
 735                                         }
 736
 737                                         return false;
 738                                 }
 739                         }
 740                         block.CompleteContexts ();
 741
 742                         return true;
 743                 }
 744
 745                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 746                 {
 747                         if (block != null)
 748                                 block.Emit (this);
 749
 750                         if (HasReturnLabel)
 751                                 ig.MarkLabel (ReturnLabel);
 752
 753                         if (return_value != null){
 754                                 ig.Emit (OpCodes.Ldloc, return_value);
 755                                 ig.Emit (OpCodes.Ret);
 756                         } else {
 757                                 //
 758                                 // If `HasReturnLabel' is set, then we already emitted a
 759                                 // jump to the end of the method, so we must emit a `ret'
 760                                 // there.
 761                                 //
 762                                 // Unfortunately, System.Reflection.Emit automatically emits
 763                                 // a leave to the end of a finally block.  This is a problem
 764                                 // if no code is following the try/finally block since we may
 765                                 // jump to a point after the end of the method.
 766                                 // As a workaround, we're always creating a return label in
 767                                 // this case.
 768                                 //
 769
 770                                 if ((block != null) && block.IsDestructor) {
 771                                         // Nothing to do; S.R.E automatically emits a leave.
 772                                 } else if (HasReturnLabel || (!unreachable && !InIterator)) {
 773                                         if (ReturnType != null)
 774                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 775                                         ig.Emit (OpCodes.Ret);
 776                                 }
 777                         }
 778
 779                         //
 780                         // Close pending helper classes if we are the toplevel
 781                         //
 782                         if (capture_context != null && capture_context.ParentToplevel == null)
 783                                 capture_context.CloseAnonymousHelperClasses ();
 784                 }
 785
 786                 /// <summary>
 787                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 788                 ///   writer to which source line this opcode belongs.
 789                 /// </summary>
 790                 public void Mark (Location loc, bool check_file)
 791                 {
 792                         if ((CodeGen.SymbolWriter == null) || Location.IsNull (loc))
 793                                 return;
 794
 795                         if (check_file && (CurrentFile != loc.File))
 796                                 return;
 797
 798                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, 0);
 799                 }
 800
 801                 public void DefineLocalVariable (string name, LocalBuilder builder)
 802                 {
 803                         if (CodeGen.SymbolWriter == null)
 804                                 return;
 805
 806                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 807                 }
 808
 809                 public void BeginScope ()
 810                 {
 811                         ig.BeginScope();
 812
 813                         if (CodeGen.SymbolWriter != null)
 814                                 CodeGen.SymbolWriter.OpenScope(ig);
 815                 }
 816
 817                 public void EndScope ()
 818                 {
 819                         ig.EndScope();
 820
 821                         if (CodeGen.SymbolWriter != null)
 822                                 CodeGen.SymbolWriter.CloseScope(ig);
 823                 }
 824
 825                 /// <summary>
 826                 ///   Returns a temporary storage for a variable of type t as
 827                 ///   a local variable in the current body.
 828                 /// </summary>
 829                 public LocalBuilder GetTemporaryLocal (Type t)
 830                 {
 831                         LocalBuilder location = null;
 832
 833                         if (temporary_storage != null){
 834                                 object o = temporary_storage [t];
 835                                 if (o != null){
 836                                         if (o is ArrayList){
 837                                                 ArrayList al = (ArrayList) o;
 838
 839                                                 for (int i = 0; i < al.Count; i++){
 840                                                         if (al [i] != null){
 841                                                                 location = (LocalBuilder) al [i];
 842                                                                 al [i] = null;
 843                                                                 break;
 844                                                         }
 845                                                 }
 846                                         } else
 847                                                 location = (LocalBuilder) o;
 848                                         if (location != null)
 849                                                 return location;
 850                                 }
 851                         }
 852
 853                         return ig.DeclareLocal (t);
 854                 }
 855
 856                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 857                 {
 858                         if (temporary_storage == null){
 859                                 temporary_storage = new Hashtable ();
 860                                 temporary_storage [t] = b;
 861                                 return;
 862                         }
 863                         object o = temporary_storage [t];
 864                         if (o == null){
 865                                 temporary_storage [t] = b;
 866                                 return;
 867                         }
 868                         if (o is ArrayList){
 869                                 ArrayList al = (ArrayList) o;
 870                                 for (int i = 0; i < al.Count; i++){
 871                                         if (al [i] == null){
 872                                                 al [i] = b;
 873                                                 return;
 874                                         }
 875                                 }
 876                                 al.Add (b);
 877                                 return;
 878                         }
 879                         ArrayList replacement = new ArrayList ();
 880                         replacement.Add (o);
 881                         temporary_storage.Remove (t);
 882                         temporary_storage [t] = replacement;
 883                 }
 884
 885                 /// <summary>
 886                 ///   Current loop begin and end labels.
 887                 /// </summary>
 888                 public Label LoopBegin, LoopEnd;
 889
 890                 /// <summary>
 891                 ///   Default target in a switch statement.   Only valid if
 892                 ///   InSwitch is true
 893                 /// </summary>
 894                 public Label DefaultTarget;
 895
 896                 /// <summary>
 897                 ///   If this is non-null, points to the current switch statement
 898                 /// </summary>
 899                 public Switch Switch;
 900
 901                 /// <summary>
 902                 ///   ReturnValue creates on demand the LocalBuilder for the
 903                 ///   return value from the function.  By default this is not
 904                 ///   used.  This is only required when returns are found inside
 905                 ///   Try or Catch statements.
 906                 ///
 907                 ///   This method is typically invoked from the Emit phase, so
 908                 ///   we allow the creation of a return label if it was not
 909                 ///   requested during the resolution phase.   Could be cleaned
 910                 ///   up, but it would replicate a lot of logic in the Emit phase
 911                 ///   of the code that uses it.
 912                 /// </summary>
 913                 public LocalBuilder TemporaryReturn ()
 914                 {
 915                         if (return_value == null){
 916                                 return_value = ig.DeclareLocal (ReturnType);
 917                                 if (!HasReturnLabel){
 918                                         ReturnLabel = ig.DefineLabel ();
 919                                         HasReturnLabel = true;
 920                                 }
 921                         }
 922
 923                         return return_value;
 924                 }
 925
 926                 /// <summary>
 927                 ///   This method is used during the Resolution phase to flag the
 928                 ///   need to define the ReturnLabel
 929                 /// </summary>
 930                 public void NeedReturnLabel ()
 931                 {
 932                         if (current_phase != Phase.Resolving){
 933                                 //
 934                                 // The reason is that the `ReturnLabel' is declared between
 935                                 // resolution and emission
 936                                 //
 937                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 938                         }
 939
 940                         if (!InIterator && !HasReturnLabel)
 941                                 HasReturnLabel = true;
 942                 }
 943
 944                 //
 945                 // Creates a field `name' with the type `t' on the proxy class
 946                 //
 947                 public FieldBuilder MapVariable (string name, Type t)
 948                 {
 949                         if (InIterator)
 950                                 return CurrentIterator.MapVariable ("v_", name, t);
 951
 952                         throw new Exception ("MapVariable for an unknown state");
 953                 }
 954
 955                 public Expression RemapParameter (int idx)
 956                 {
 957                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 958                         fe.InstanceExpression = new ProxyInstance ();
 959                         return fe.DoResolve (this);
 960                 }
 961
 962                 public Expression RemapParameterLValue (int idx, Expression right_side)
 963                 {
 964                         FieldExpr fe = new FieldExprNoAddress (CurrentIterator.parameter_fields [idx].FieldBuilder, loc);
 965                         fe.InstanceExpression = new ProxyInstance ();
 966                         return fe.DoResolveLValue (this, right_side);
 967                 }
 968
 969                 //
 970                 // Emits the proper object to address fields on a remapped
 971                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 972                 //
 973                 public void EmitThis ()
 974                 {
 975                         ig.Emit (OpCodes.Ldarg_0);
 976                         if (InIterator){
 977                                 if (!IsStatic){
 978                                         FieldBuilder this_field = CurrentIterator.this_field.FieldBuilder;
 979                                         if (TypeManager.IsValueType (this_field.FieldType))
 980                                                 ig.Emit (OpCodes.Ldflda, this_field);
 981                                         else
 982                                                 ig.Emit (OpCodes.Ldfld, this_field);
 983                                 }
 984                         } else if (capture_context != null && CurrentAnonymousMethod != null){
 985                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 986                                 while (si != null){
 987                                         if (si.ParentLink != null)
 988                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 989                                         if (si.THIS != null){
 990                                                 ig.Emit (OpCodes.Ldfld, si.THIS);
 991                                                 break;
 992                                         }
 993                                         si = si.ParentScope;
 994                                 }
 995                         }
 996                 }
 997
 998                 //
 999                 // Emits the code necessary to load the instance required
1000                 // to access the captured LocalInfo
1001                 //
1002                 public void EmitCapturedVariableInstance (LocalInfo li)
1003                 {
1004                         if (RemapToProxy){
1005                                 ig.Emit (OpCodes.Ldarg_0);
1006                                 return;
1007                         }
1008
1009                         if (capture_context == null)
1010                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
1011
1012                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1013                 }
1014
1015                 public void EmitParameter (string name)
1016                 {
1017                         capture_context.EmitParameter (this, name);
1018                 }
1019
1020                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
1021                 {
1022                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
1023                 }
1024
1025                 public void EmitAddressOfParameter (string name)
1026                 {
1027                         capture_context.EmitAddressOfParameter (this, name);
1028                 }
1029
1030                 public Expression GetThis (Location loc)
1031                 {
1032                         This my_this;
1033                         if (CurrentBlock != null)
1034                                 my_this = new This (CurrentBlock, loc);
1035                         else
1036                                 my_this = new This (loc);
1037
1038                         if (!my_this.ResolveBase (this))
1039                                 my_this = null;
1040
1041                         return my_this;
1042                 }
1043         }
1044
1045
1046         public abstract class CommonAssemblyModulClass: Attributable {
1047                 protected CommonAssemblyModulClass ():
1048                         base (null)
1049                 {
1050                 }
1051
1052                 public void AddAttributes (ArrayList attrs)
1053                 {
1054                         if (OptAttributes == null) {
1055                                 OptAttributes = new Attributes (attrs);
1056                                 return;
1057                         }
1058                         OptAttributes.AddAttributes (attrs);
1059                 }
1060
1061                 public virtual void Emit (TypeContainer tc)
1062                 {
1063                         if (OptAttributes == null)
1064                                 return;
1065
1066                         EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
1067                         OptAttributes.Emit (ec, this);
1068                 }
1069
1070                 protected Attribute ResolveAttribute (Type a_type)
1071                 {
1072                         if (OptAttributes == null)
1073                                 return null;
1074
1075                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1076                         if (!OptAttributes.CheckTargets (this))
1077                                 return null;
1078
1079                         EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
1080                         Attribute a = OptAttributes.Search (a_type, temp_ec);
1081                         if (a != null) {
1082                                 a.Resolve (temp_ec);
1083                         }
1084                         return a;
1085                 }
1086         }
1087
1088         public class AssemblyClass: CommonAssemblyModulClass {
1089                 // TODO: make it private and move all builder based methods here
1090                 public AssemblyBuilder Builder;
1091                 bool is_cls_compliant;
1092                 public Attribute ClsCompliantAttribute;
1093
1094                 ListDictionary declarative_security;
1095
1096                 static string[] attribute_targets = new string [] { "assembly" };
1097
1098                 public AssemblyClass (): base ()
1099                 {
1100                         is_cls_compliant = false;
1101                 }
1102
1103                 public bool IsClsCompliant {
1104                         get {
1105                                 return is_cls_compliant;
1106                         }
1107                 }
1108
1109                 public override AttributeTargets AttributeTargets {
1110                         get {
1111                                 return AttributeTargets.Assembly;
1112                         }
1113                 }
1114
1115                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1116                 {
1117                         return is_cls_compliant;
1118                 }
1119
1120                 public void ResolveClsCompliance ()
1121                 {
1122                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1123                         if (ClsCompliantAttribute == null)
1124                                 return;
1125
1126                         is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
1127                 }
1128
1129                 // fix bug #56621
1130                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1131                 {
1132                         try {
1133                                 // check for possible ECMA key
1134                                 if (strongNameBlob.Length == 16) {
1135                                         // will be rejected if not "the" ECMA key
1136                                         an.SetPublicKey (strongNameBlob);
1137                                 }
1138                                 else {
1139                                         // take it, with or without, a private key
1140                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1141                                         // and make sure we only feed the public part to Sys.Ref
1142                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1143
1144                                         // AssemblyName.SetPublicKey requires an additional header
1145                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1146
1147                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1148                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1149                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1150                                         an.SetPublicKey (encodedPublicKey);
1151                                 }
1152                         }
1153                         catch (Exception) {
1154                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1155                                         RootContext.StrongNameKeyFile + "' incorrectly encoded.");
1156                                 Environment.Exit (1);
1157                         }
1158                 }
1159
1160                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1161                 public AssemblyName GetAssemblyName (string name, string output)
1162                 {
1163                         if (OptAttributes != null) {
1164                                 foreach (Attribute a in OptAttributes.Attrs) {
1165                                         // cannot rely on any resolve-based members before you call Resolve
1166                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1167                                                 continue;
1168
1169                                         // TODO: This code is buggy: comparing Attribute name without resolving it is wrong.
1170                                         //       However, this is invoked by CodeGen.Init, at which time none of the namespaces
1171                                         //       are loaded yet.
1172                                         switch (a.Name) {
1173                                                 case "AssemblyKeyFile":
1174                                                 case "AssemblyKeyFileAttribute":
1175                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1176                                                         if (RootContext.StrongNameKeyFile != null) {
1177                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1178                                                                 Report.Warning (1616, "Compiler option '{0}' overrides '{1}' given in source", "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1179                                                         }
1180                                                         else {
1181                                                                 string value = a.GetString ();
1182                                                                 if (value != String.Empty)
1183                                                                         RootContext.StrongNameKeyFile = value;
1184                                                         }
1185                                                         break;
1186                                                 case "AssemblyKeyName":
1187                                                 case "AssemblyKeyNameAttribute":
1188                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1189                                                         if (RootContext.StrongNameKeyContainer != null) {
1190                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1191                                                                 Report.Warning (1616, "keycontainer", "Compiler option '{0}' overrides '{1}' given in source", "System.Reflection.AssemblyKeyNameAttribute");
1192                                                         }
1193                                                         else {
1194                                                                 string value = a.GetString ();
1195                                                                 if (value != String.Empty)
1196                                                                         RootContext.StrongNameKeyContainer = value;
1197                                                         }
1198                                                         break;
1199                                                 case "AssemblyDelaySign":
1200                                                 case "AssemblyDelaySignAttribute":
1201                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1202                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1203                                                         break;
1204                                         }
1205                                 }
1206                         }
1207
1208                         AssemblyName an = new AssemblyName ();
1209                         an.Name = Path.GetFileNameWithoutExtension (name);
1210
1211                         // note: delay doesn't apply when using a key container
1212                         if (RootContext.StrongNameKeyContainer != null) {
1213                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1214                                 return an;
1215                         }
1216
1217                         // strongname is optional
1218                         if (RootContext.StrongNameKeyFile == null)
1219                                 return an;
1220
1221                         string AssemblyDir = Path.GetDirectoryName (output);
1222
1223                         // the StrongName key file may be relative to (a) the compiled
1224                         // file or (b) to the output assembly. See bugzilla #55320
1225                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1226
1227                         // (a) relative to the compiled file
1228                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1229                         bool exist = File.Exists (filename);
1230                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1231                                 // (b) relative to the outputed assembly
1232                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1233                                 exist = File.Exists (filename);
1234                         }
1235
1236                         if (exist) {
1237                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1238                                         byte[] snkeypair = new byte [fs.Length];
1239                                         fs.Read (snkeypair, 0, snkeypair.Length);
1240
1241                                         if (RootContext.StrongNameDelaySign) {
1242                                                 // delayed signing - DO NOT include private key
1243                                                 SetPublicKey (an, snkeypair);
1244                                         }
1245                                         else {
1246                                                 // no delay so we make sure we have the private key
1247                                                 try {
1248                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1249                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1250                                                 }
1251                                                 catch (CryptographicException) {
1252                                                         if (snkeypair.Length == 16) {
1253                                                                 // error # is different for ECMA key
1254                                                                 Report.Error (1606, "Could not strongname the assembly. " +
1255                                                                         "ECMA key can only be used to delay-sign assemblies");
1256                                                         }
1257                                                         else {
1258                                                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1259                                                                         RootContext.StrongNameKeyFile +
1260                                                                         "' doesn't have a private key.");
1261                                                         }
1262                                                         return null;
1263                                                 }
1264                                         }
1265                                 }
1266                         }
1267                         else {
1268                                 Report.Error (1548, "Could not strongname the assembly. File `" +
1269                                         RootContext.StrongNameKeyFile + "' not found.");
1270                                 return null;
1271                         }
1272                         return an;
1273                 }
1274
1275                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1276                 {
1277                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1278                                 if (declarative_security == null)
1279                                         declarative_security = new ListDictionary ();
1280
1281                                 a.ExtractSecurityPermissionSet (declarative_security);
1282                                 return;
1283                         }
1284
1285                         Builder.SetCustomAttribute (customBuilder);
1286                 }
1287
1288                 public override void Emit (TypeContainer tc)
1289                 {
1290                         base.Emit (tc);
1291
1292                         if (declarative_security != null) {
1293
1294                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1295                                 object builder_instance = Builder;
1296
1297                                 try {
1298                                         // Microsoft runtime hacking
1299                                         if (add_permission == null) {
1300                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1301                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1302
1303                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1304                                                 builder_instance = fi.GetValue (Builder);
1305                                         }
1306
1307                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1308                                                                                                   declarative_security [SecurityAction.RequestOptional],
1309                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1310                                         add_permission.Invoke (builder_instance, args);
1311                                 }
1312                                 catch {
1313                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1314                                 }
1315                         }
1316                 }
1317
1318                 public override string[] ValidAttributeTargets {
1319                         get {
1320                                 return attribute_targets;
1321                         }
1322                 }
1323         }
1324
1325         public class ModuleClass: CommonAssemblyModulClass {
1326                 // TODO: make it private and move all builder based methods here
1327                 public ModuleBuilder Builder;
1328                 bool m_module_is_unsafe;
1329
1330                 public CharSet DefaultCharSet = CharSet.Ansi;
1331                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1332
1333                 static string[] attribute_targets = new string [] { "module" };
1334
1335                 public ModuleClass (bool is_unsafe)
1336                 {
1337                         m_module_is_unsafe = is_unsafe;
1338                 }
1339
1340                 public override AttributeTargets AttributeTargets {
1341                         get {
1342                                 return AttributeTargets.Module;
1343                         }
1344                 }
1345
1346                 public override bool IsClsCompliaceRequired(DeclSpace ds)
1347                 {
1348                         return CodeGen.Assembly.IsClsCompliant;
1349                 }
1350
1351                 public override void Emit (TypeContainer tc)
1352                 {
1353                         base.Emit (tc);
1354
1355                         if (!m_module_is_unsafe)
1356                                 return;
1357
1358                         if (TypeManager.unverifiable_code_ctor == null) {
1359                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1360                                 return;
1361                         }
1362
1363                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1364                 }
1365
1366                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1367                 {
1368                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1369                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1370                                         Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1371                                 }
1372                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1373                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.Name);
1374                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1375                                         return;
1376                                 }
1377                         }
1378
1379                         Builder.SetCustomAttribute (customBuilder);
1380                 }
1381
1382                 /// <summary>
1383                 /// It is called very early therefore can resolve only predefined attributes
1384                 /// </summary>
1385                 public void ResolveAttributes ()
1386                 {
1387 #if NET_2_0
1388                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1389                         if (a != null) {
1390                                 DefaultCharSet = a.GetCharSetValue ();
1391                                 switch (DefaultCharSet) {
1392                                         case CharSet.Ansi:
1393                                         case CharSet.None:
1394                                                 break;
1395                                         case CharSet.Auto:
1396                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1397                                                 break;
1398                                         case CharSet.Unicode:
1399                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1400                                                 break;
1401                                         default:
1402                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1403                                                 break;
1404                                 }
1405                         }
1406 #endif
1407                 }
1408
1409                 public override string[] ValidAttributeTargets {
1410                         get {
1411                                 return attribute_targets;
1412                         }
1413                 }
1414         }
1415 }