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
  11 #if !DEBUG
  12         #define PRODUCTION
  13 #endif
  14
  15 using System;
  16 using System.IO;
  17 using System.Collections;
  18 using System.Collections.Specialized;
  19 using System.Reflection;
  20 using System.Reflection.Emit;
  21 using System.Runtime.InteropServices;
  22 using System.Security;
  23 using System.Security.Cryptography;
  24 using System.Security.Permissions;
  25
  26 using Mono.Security.Cryptography;
  27
  28 namespace Mono.CSharp {
  29
  30         /// <summary>
  31         ///    Code generator class.
  32         /// </summary>
  33         public class CodeGen {
  34                 static AppDomain current_domain;
  35                 static public SymbolWriter SymbolWriter;
  36
  37                 public static AssemblyClass Assembly;
  38                 public static ModuleClass Module;
  39
  40                 static CodeGen ()
  41                 {
  42                         Reset ();
  43                 }
  44
  45                 public static void Reset ()
  46                 {
  47                         Assembly = new AssemblyClass ();
  48                         Module = new ModuleClass (RootContext.Unsafe);
  49                 }
  50
  51                 public static string Basename (string name)
  52                 {
  53                         int pos = name.LastIndexOf ('/');
  54
  55                         if (pos != -1)
  56                                 return name.Substring (pos + 1);
  57
  58                         pos = name.LastIndexOf ('\\');
  59                         if (pos != -1)
  60                                 return name.Substring (pos + 1);
  61
  62                         return name;
  63                 }
  64
  65                 public static string Dirname (string name)
  66                 {
  67                         int pos = name.LastIndexOf ('/');
  68
  69                         if (pos != -1)
  70                                 return name.Substring (0, pos);
  71
  72                         pos = name.LastIndexOf ('\\');
  73                         if (pos != -1)
  74                                 return name.Substring (0, pos);
  75
  76                         return ".";
  77                 }
  78
  79                 static public string FileName;
  80
  81                 //
  82                 // Initializes the symbol writer
  83                 //
  84                 static void InitializeSymbolWriter (string filename)
  85                 {
  86                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  87
  88                         //
  89                         // If we got an ISymbolWriter instance, initialize it.
  90                         //
  91                         if (SymbolWriter == null) {
  92                                 Report.Warning (
  93                                         -18, 1, "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.");
  94                                 return;
  95                         }
  96                 }
  97
  98                 //
  99                 // Initializes the code generator variables
 100                 //
 101                 static public bool Init (string name, string output, bool want_debugging_support)
 102                 {
 103                         FileName = output;
 104                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 105                         if (an == null)
 106                                 return false;
 107
 108                         if (an.KeyPair != null) {
 109                                 // If we are going to strong name our assembly make
 110                                 // sure all its refs are strong named
 111                                 foreach (Assembly a in RootNamespace.Global.Assemblies) {
 112                                         AssemblyName ref_name = a.GetName ();
 113                                         byte [] b = ref_name.GetPublicKeyToken ();
 114                                         if (b == null || b.Length == 0) {
 115                                                 Report.Error (1577, "Assembly generation failed " +
 116                                                                 "-- Referenced assembly '" +
 117                                                                 ref_name.Name +
 118                                                                 "' does not have a strong name.");
 119                                                 //Environment.Exit (1);
 120                                         }
 121                                 }
 122                         }
 123
 124                         current_domain = AppDomain.CurrentDomain;
 125
 126                         try {
 127                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 128                                         AssemblyBuilderAccess.Save, Dirname (name));
 129                         }
 130                         catch (ArgumentException) {
 131                                 // specified key may not be exportable outside it's container
 132                                 if (RootContext.StrongNameKeyContainer != null) {
 133                                         Report.Error (1548, "Could not access the key inside the container `" +
 134                                                 RootContext.StrongNameKeyContainer + "'.");
 135                                         Environment.Exit (1);
 136                                 }
 137                                 return false;
 138                         }
 139                         catch (CryptographicException) {
 140                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 141                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 142                                         Environment.Exit (1);
 143                                 }
 144                                 return false;
 145                         }
 146
 147                         //
 148                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 149                         // this copes with output in different directories then.
 150                         // FIXME: figure out how this copes with --output /tmp/blah
 151                         //
 152                         // If the third argument is true, the ModuleBuilder will dynamically
 153                         // load the default symbol writer.
 154                         //
 155                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 156                                 Basename (name), Basename (output), false);
 157
 158                         if (want_debugging_support)
 159                                 InitializeSymbolWriter (output);
 160
 161                         return true;
 162                 }
 163
 164                 static public void Save (string name)
 165                 {
 166                         try {
 167                                 Assembly.Builder.Save (Basename (name));
 168
 169                                 if (SymbolWriter != null)
 170                                         SymbolWriter.WriteSymbolFile ();
 171                         }
 172                         catch (COMException) {
 173                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 174                                         throw;
 175
 176                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 177                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 178                                         RootContext.StrongNameKeyFile +
 179                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 180                         }
 181                         catch (System.IO.IOException io) {
 182                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 183                         }
 184                         catch (System.UnauthorizedAccessException ua) {
 185                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 186                         }
 187                 }
 188         }
 189
 190
 191         public interface IResolveContext
 192         {
 193                 DeclSpace DeclContainer { get; }
 194                 bool IsInObsoleteScope { get; }
 195                 bool IsInUnsafeScope { get; }
 196         }
 197
 198         /// <summary>
 199         ///   An Emit Context is created for each body of code (from methods,
 200         ///   properties bodies, indexer bodies or constructor bodies)
 201         /// </summary>
 202         public class EmitContext : IResolveContext {
 203
 204                 DeclSpace declSpace;
 205                 public DeclSpace TypeContainer;
 206                 public ILGenerator   ig;
 207
 208                 [Flags]
 209                 public enum Flags : byte {
 210                         /// <summary>
 211                         ///   This flag tracks the `checked' state of the compilation,
 212                         ///   it controls whether we should generate code that does overflow
 213                         ///   checking, or if we generate code that ignores overflows.
 214                         ///
 215                         ///   The default setting comes from the command line option to generate
 216                         ///   checked or unchecked code plus any source code changes using the
 217                         ///   checked/unchecked statements or expressions.   Contrast this with
 218                         ///   the ConstantCheckState flag.
 219                         /// </summary>
 220                         CheckState = 1 << 0,
 221
 222                         /// <summary>
 223                         ///   The constant check state is always set to `true' and cant be changed
 224                         ///   from the command line.  The source code can change this setting with
 225                         ///   the `checked' and `unchecked' statements and expressions.
 226                         /// </summary>
 227                         ConstantCheckState = 1 << 1,
 228
 229                         AllCheckStateFlags = CheckState | ConstantCheckState,
 230
 231                         /// <summary>
 232                         ///  Whether we are inside an unsafe block
 233                         /// </summary>
 234                         InUnsafe = 1 << 2,
 235
 236                         InCatch = 1 << 3,
 237                         InFinally = 1 << 4,
 238
 239                         /// <summary>
 240                         ///   Whether control flow analysis is enabled
 241                         /// </summary>
 242                         DoFlowAnalysis = 1 << 5,
 243
 244                         /// <summary>
 245                         ///   Whether control flow analysis is disabled on structs
 246                         ///   (only meaningful when DoFlowAnalysis is set)
 247                         /// </summary>
 248                         OmitStructFlowAnalysis = 1 << 6
 249                 }
 250
 251                 Flags flags;
 252
 253                 /// <summary>
 254                 ///   Whether we are emitting code inside a static or instance method
 255                 /// </summary>
 256                 public bool IsStatic;
 257
 258                 /// <summary>
 259                 ///   Whether the actual created method is static or instance method.
 260                 ///   Althoug the method might be declared as `static', if an anonymous
 261                 ///   method is involved, we might turn this into an instance method.
 262                 ///
 263                 ///   So this reflects the low-level staticness of the method, while
 264                 ///   IsStatic represents the semantic, high-level staticness.
 265                 /// </summary>
 266                 public bool MethodIsStatic;
 267
 268                 /// <summary>
 269                 ///   Whether we are emitting a field initializer
 270                 /// </summary>
 271                 public bool IsFieldInitializer;
 272
 273                 /// <summary>
 274                 ///   The value that is allowed to be returned or NULL if there is no
 275                 ///   return type.
 276                 /// </summary>
 277                 public Type ReturnType;
 278
 279                 /// <summary>
 280                 ///   Points to the Type (extracted from the TypeContainer) that
 281                 ///   declares this body of code
 282                 /// </summary>
 283                 public Type ContainerType;
 284
 285                 /// <summary>
 286                 ///   Whether this is generating code for a constructor
 287                 /// </summary>
 288                 public bool IsConstructor;
 289
 290                 /// <summary>
 291                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 292                 ///   to store structures (used to compute the address of the structure
 293                 ///   value on structure method invocations)
 294                 /// </summary>
 295                 public Hashtable temporary_storage;
 296
 297                 public Block CurrentBlock;
 298
 299                 public int CurrentFile;
 300
 301                 /// <summary>
 302                 ///   The location where we store the return value.
 303                 /// </summary>
 304                 LocalBuilder return_value;
 305
 306                 /// <summary>
 307                 ///   The location where return has to jump to return the
 308                 ///   value
 309                 /// </summary>
 310                 public Label ReturnLabel;
 311
 312                 /// <summary>
 313                 ///   If we already defined the ReturnLabel
 314                 /// </summary>
 315                 public bool HasReturnLabel;
 316
 317                 /// <summary>
 318                 ///   Whether we are inside an iterator block.
 319                 /// </summary>
 320                 public bool InIterator;
 321
 322                 public bool IsLastStatement;
 323
 324                 /// <summary>
 325                 ///  Whether we are in a `fixed' initialization
 326                 /// </summary>
 327                 public bool InFixedInitializer;
 328
 329                 /// <summary>
 330                 ///  Whether we are inside an anonymous method.
 331                 /// </summary>
 332                 public AnonymousContainer CurrentAnonymousMethod;
 333
 334                 /// <summary>
 335                 ///   Location for this EmitContext
 336                 /// </summary>
 337                 public Location loc;
 338
 339                 /// <summary>
 340                 ///   Inside an enum definition, we do not resolve enumeration values
 341                 ///   to their enumerations, but rather to the underlying type/value
 342                 ///   This is so EnumVal + EnumValB can be evaluated.
 343                 ///
 344                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 345                 ///   we relax the rules
 346                 /// </summary>
 347                 public bool InEnumContext;
 348
 349                 /// <summary>
 350                 ///   Anonymous methods can capture local variables and fields,
 351                 ///   this object tracks it.  It is copied from the TopLevelBlock
 352                 ///   field.
 353                 /// </summary>
 354                 public CaptureContext capture_context;
 355
 356                 public readonly IResolveContext ResolveContext;
 357
 358                 /// <summary>
 359                 ///    The current iterator
 360                 /// </summary>
 361                 public Iterator CurrentIterator;
 362
 363                 /// <summary>
 364                 ///    Whether we are in the resolving stage or not
 365                 /// </summary>
 366                 enum Phase {
 367                         Created,
 368                         Resolving,
 369                         Emitting
 370                 }
 371
 372                 bool isAnonymousMethodAllowed = true;
 373
 374                 Phase current_phase;
 375                 FlowBranching current_flow_branching;
 376
 377                 static int next_id = 0;
 378                 int id = ++next_id;
 379
 380                 public override string ToString ()
 381                 {
 382                         return String.Format ("EmitContext ({0}:{1}:{2})", id,
 383                                               CurrentIterator, capture_context, loc);
 384                 }
 385
 386                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 387                                     Type return_type, int code_flags, bool is_constructor)
 388                 {
 389                         this.ResolveContext = rc;
 390                         this.ig = ig;
 391
 392                         TypeContainer = parent;
 393                         this.declSpace = ds;
 394                         if (RootContext.Checked)
 395                                 flags |= Flags.CheckState;
 396                         flags |= Flags.ConstantCheckState;
 397
 398                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 399                         MethodIsStatic = IsStatic;
 400                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 401                         ReturnType = return_type;
 402                         IsConstructor = is_constructor;
 403                         CurrentBlock = null;
 404                         CurrentFile = 0;
 405                         current_phase = Phase.Created;
 406
 407                         if (parent != null){
 408                                 // Can only be null for the ResolveType contexts.
 409                                 ContainerType = parent.TypeBuilder;
 410                                 if (rc.IsInUnsafeScope)
 411                                         flags |= Flags.InUnsafe;
 412                         }
 413                         loc = l;
 414
 415                         if (ReturnType == TypeManager.void_type)
 416                                 ReturnType = null;
 417                 }
 418
 419                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 420                                     Type return_type, int code_flags, bool is_constructor)
 421                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 422                 {
 423                 }
 424
 425                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 426                                     Type return_type, int code_flags)
 427                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 428                 {
 429                 }
 430
 431                 public DeclSpace DeclContainer {
 432                         get { return declSpace; }
 433                         set { declSpace = value; }
 434                 }
 435
 436                 public bool CheckState {
 437                         get { return (flags & Flags.CheckState) != 0; }
 438                 }
 439
 440                 public bool ConstantCheckState {
 441                         get { return (flags & Flags.ConstantCheckState) != 0; }
 442                 }
 443
 444                 public bool InUnsafe {
 445                         get { return (flags & Flags.InUnsafe) != 0; }
 446                 }
 447
 448                 public bool InCatch {
 449                         get { return (flags & Flags.InCatch) != 0; }
 450                 }
 451
 452                 public bool InFinally {
 453                         get { return (flags & Flags.InFinally) != 0; }
 454                 }
 455
 456                 public bool DoFlowAnalysis {
 457                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 458                 }
 459
 460                 public bool OmitStructFlowAnalysis {
 461                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 462                 }
 463
 464                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 465                 // it's public so that we can use a struct at the callsite
 466                 public struct FlagsHandle : IDisposable
 467                 {
 468                         EmitContext ec;
 469                         Flags invmask, oldval;
 470                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 471                         {
 472                                 this.ec = ec;
 473                                 invmask = ~mask;
 474                                 oldval = ec.flags & mask;
 475                                 ec.flags = (ec.flags & invmask) | (val & mask);
 476                         }
 477                         public void Dispose ()
 478                         {
 479                                 ec.flags = (ec.flags & invmask) | oldval;
 480                         }
 481                 }
 482
 483                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 484                 public FlagsHandle With (Flags bits, bool enable)
 485                 {
 486                         return new FlagsHandle (this, bits, enable ? bits : 0);
 487                 }
 488
 489                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 490                 {
 491                         Flags newflags =
 492                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 493                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 494                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 495                 }
 496
 497                 public bool IsInObsoleteScope {
 498                         get { return ResolveContext.IsInObsoleteScope; }
 499                 }
 500
 501                 public bool IsInUnsafeScope {
 502                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 503                 }
 504
 505                 public bool IsAnonymousMethodAllowed {
 506                         get { return isAnonymousMethodAllowed; }
 507                         set { isAnonymousMethodAllowed = value; }
 508                 }
 509
 510                 public FlowBranching CurrentBranching {
 511                         get { return current_flow_branching; }
 512                 }
 513
 514                 public bool HaveCaptureInfo {
 515                         get { return capture_context != null; }
 516                 }
 517
 518                 public void EmitScopeInitFromBlock (Block b)
 519                 {
 520                         if (capture_context != null)
 521                                 capture_context.EmitScopeInitFromBlock (this, b);
 522                 }
 523
 524                 // <summary>
 525                 //   Starts a new code branching.  This inherits the state of all local
 526                 //   variables and parameters from the current branching.
 527                 // </summary>
 528                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 529                 {
 530                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 531                         return current_flow_branching;
 532                 }
 533
 534                 // <summary>
 535                 //   Starts a new code branching for block `block'.
 536                 // </summary>
 537                 public FlowBranching StartFlowBranching (Block block)
 538                 {
 539                         FlowBranching.BranchingType type;
 540
 541                         if ((CurrentBranching != null) &&
 542                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 543                                 type = FlowBranching.BranchingType.SwitchSection;
 544                         else
 545                                 type = FlowBranching.BranchingType.Block;
 546
 547                         flags |= Flags.DoFlowAnalysis;
 548
 549                         current_flow_branching = FlowBranching.CreateBranching (
 550                                 CurrentBranching, type, block, block.StartLocation);
 551                         return current_flow_branching;
 552                 }
 553
 554                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 555                 {
 556                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 557                         current_flow_branching = branching;
 558                         return branching;
 559                 }
 560
 561                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 562                 {
 563                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 564                         current_flow_branching = branching;
 565                         return branching;
 566                 }
 567
 568                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 569                 {
 570                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 571                         current_flow_branching = branching;
 572                         return branching;
 573                 }
 574
 575                 // <summary>
 576                 //   Ends a code branching.  Merges the state of locals and parameters
 577                 //   from all the children of the ending branching.
 578                 // </summary>
 579                 public FlowBranching.UsageVector DoEndFlowBranching ()
 580                 {
 581                         FlowBranching old = current_flow_branching;
 582                         current_flow_branching = current_flow_branching.Parent;
 583
 584                         return current_flow_branching.MergeChild (old);
 585                 }
 586
 587                 // <summary>
 588                 //   Ends a code branching.  Merges the state of locals and parameters
 589                 //   from all the children of the ending branching.
 590                 // </summary>
 591                 public FlowBranching.Reachability EndFlowBranching ()
 592                 {
 593                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 594
 595                         return vector.Reachability;
 596                 }
 597
 598                 // <summary>
 599                 //   Kills the current code branching.  This throws away any changed state
 600                 //   information and should only be used in case of an error.
 601                 // </summary>
 602                 public void KillFlowBranching ()
 603                 {
 604                         current_flow_branching = current_flow_branching.Parent;
 605                 }
 606
 607                 public void CaptureVariable (LocalInfo li)
 608                 {
 609                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 610                         li.IsCaptured = true;
 611                 }
 612
 613                 public void CaptureParameter (string name, Type t, int idx)
 614                 {
 615                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 616                 }
 617
 618                 public void CaptureThis ()
 619                 {
 620                         capture_context.CaptureThis (CurrentAnonymousMethod);
 621                 }
 622
 623
 624                 //
 625                 // Use to register a field as captured
 626                 //
 627                 public void CaptureField (FieldExpr fe)
 628                 {
 629                         capture_context.AddField (this, CurrentAnonymousMethod, fe);
 630                 }
 631
 632                 //
 633                 // Whether anonymous methods have captured variables
 634                 //
 635                 public bool HaveCapturedVariables ()
 636                 {
 637                         if (capture_context != null)
 638                                 return capture_context.HaveCapturedVariables;
 639                         return false;
 640                 }
 641
 642                 //
 643                 // Whether anonymous methods have captured fields or this.
 644                 //
 645                 public bool HaveCapturedFields ()
 646                 {
 647                         if (capture_context != null)
 648                                 return capture_context.HaveCapturedFields;
 649                         return false;
 650                 }
 651
 652                 //
 653                 // Emits the instance pointer for the host method
 654                 //
 655                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 656                 {
 657                         if (capture_context != null)
 658                                 capture_context.EmitMethodHostInstance (target, am);
 659                         else if (IsStatic)
 660                                 target.ig.Emit (OpCodes.Ldnull);
 661                         else
 662                                 target.ig.Emit (OpCodes.Ldarg_0);
 663                 }
 664
 665                 //
 666                 // Returns whether the `local' variable has been captured by an anonymous
 667                 // method
 668                 //
 669                 public bool IsCaptured (LocalInfo local)
 670                 {
 671                         return capture_context.IsCaptured (local);
 672                 }
 673
 674                 public bool IsParameterCaptured (string name)
 675                 {
 676                         if (capture_context != null)
 677                                 return capture_context.IsParameterCaptured (name);
 678                         return false;
 679                 }
 680
 681                 public void EmitMeta (ToplevelBlock b)
 682                 {
 683                         if (capture_context != null)
 684                                 capture_context.EmitAnonymousHelperClasses (this);
 685                         b.EmitMeta (this);
 686
 687                         if (HasReturnLabel)
 688                                 ReturnLabel = ig.DefineLabel ();
 689                 }
 690
 691                 //
 692                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 693                 // currently can not cope with ig == null during resolve (which must
 694                 // be fixed for switch statements to work on anonymous methods).
 695                 //
 696                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 697                 {
 698                         if (block == null)
 699                                 return;
 700
 701                         bool unreachable;
 702
 703                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 704                                 EmitMeta (block);
 705
 706                                 current_phase = Phase.Emitting;
 707                                 EmitResolvedTopBlock (block, unreachable);
 708                         }
 709                 }
 710
 711                 bool resolved;
 712
 713                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 714                                              Parameters ip, IMethodData md, out bool unreachable)
 715                 {
 716                         current_phase = Phase.Resolving;
 717
 718                         unreachable = false;
 719
 720                         if (resolved)
 721                                 return true;
 722
 723                         capture_context = block.CaptureContext;
 724
 725                         if (!loc.IsNull)
 726                                 CurrentFile = loc.File;
 727
 728 #if PRODUCTION
 729                         try {
 730 #endif
 731                                 if (!block.ResolveMeta (this, ip))
 732                                         return false;
 733
 734                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 735                                         FlowBranchingToplevel top_level;
 736                                         if (anonymous_method_host != null)
 737                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 738                                         else
 739                                                 top_level = block.TopLevelBranching;
 740
 741                                         current_flow_branching = top_level;
 742                                         bool ok = block.Resolve (this);
 743                                         current_flow_branching = null;
 744
 745                                         if (!ok)
 746                                                 return false;
 747
 748                                         FlowBranching.Reachability reachability = top_level.End ();
 749                                         if (reachability.IsUnreachable)
 750                                                 unreachable = true;
 751                                 }
 752 #if PRODUCTION
 753                         } catch (Exception e) {
 754                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 755                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 756
 757                                 if (CurrentBlock != null){
 758                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 759                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 760                                 }
 761                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 762                                 throw;
 763                         }
 764 #endif
 765
 766                         if (ReturnType != null && !unreachable) {
 767                                 if (CurrentAnonymousMethod == null) {
 768                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 769                                         return false;
 770                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 771                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 772                                                 CurrentAnonymousMethod.GetSignatureForError ());
 773                                         return false;
 774                                 }
 775                         }
 776
 777                         block.CompleteContexts ();
 778                         resolved = true;
 779                         return true;
 780                 }
 781
 782                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 783                 {
 784                         if (block != null)
 785                                 block.Emit (this);
 786
 787                         if (HasReturnLabel)
 788                                 ig.MarkLabel (ReturnLabel);
 789
 790                         if (return_value != null){
 791                                 ig.Emit (OpCodes.Ldloc, return_value);
 792                                 ig.Emit (OpCodes.Ret);
 793                         } else {
 794                                 //
 795                                 // If `HasReturnLabel' is set, then we already emitted a
 796                                 // jump to the end of the method, so we must emit a `ret'
 797                                 // there.
 798                                 //
 799                                 // Unfortunately, System.Reflection.Emit automatically emits
 800                                 // a leave to the end of a finally block.  This is a problem
 801                                 // if no code is following the try/finally block since we may
 802                                 // jump to a point after the end of the method.
 803                                 // As a workaround, we're always creating a return label in
 804                                 // this case.
 805                                 //
 806
 807                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 808                                         CurrentAnonymousMethod.IsIterator && InIterator;
 809
 810                                 if ((block != null) && block.IsDestructor) {
 811                                         // Nothing to do; S.R.E automatically emits a leave.
 812                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 813                                         if (ReturnType != null)
 814                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 815                                         ig.Emit (OpCodes.Ret);
 816                                 }
 817                         }
 818
 819                         //
 820                         // Close pending helper classes if we are the toplevel
 821                         //
 822                         if (capture_context != null && capture_context.ParentToplevel == null)
 823                                 capture_context.CloseAnonymousHelperClasses ();
 824                 }
 825
 826                 /// <summary>
 827                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 828                 ///   writer to which source line this opcode belongs.
 829                 /// </summary>
 830                 public void Mark (Location loc, bool check_file)
 831                 {
 832                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 833                                 return;
 834
 835                         if (check_file && (CurrentFile != loc.File))
 836                                 return;
 837
 838                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 839                 }
 840
 841                 public void DefineLocalVariable (string name, LocalBuilder builder)
 842                 {
 843                         if (CodeGen.SymbolWriter == null)
 844                                 return;
 845
 846                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 847                 }
 848
 849                 public void BeginScope ()
 850                 {
 851                         ig.BeginScope();
 852
 853                         if (CodeGen.SymbolWriter != null)
 854                                 CodeGen.SymbolWriter.OpenScope(ig);
 855                 }
 856
 857                 public void EndScope ()
 858                 {
 859                         ig.EndScope();
 860
 861                         if (CodeGen.SymbolWriter != null)
 862                                 CodeGen.SymbolWriter.CloseScope(ig);
 863                 }
 864
 865                 /// <summary>
 866                 ///   Returns a temporary storage for a variable of type t as
 867                 ///   a local variable in the current body.
 868                 /// </summary>
 869                 public LocalBuilder GetTemporaryLocal (Type t)
 870                 {
 871                         if (temporary_storage != null) {
 872                                 object o = temporary_storage [t];
 873                                 if (o != null) {
 874                                         if (o is Stack) {
 875                                                 Stack s = (Stack) o;
 876                                                 o = s.Count == 0 ? null : s.Pop ();
 877                                         } else {
 878                                                 temporary_storage.Remove (t);
 879                                         }
 880                                 }
 881                                 if (o != null)
 882                                         return (LocalBuilder) o;
 883                         }
 884                         return ig.DeclareLocal (t);
 885                 }
 886
 887                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 888                 {
 889                         Stack s;
 890
 891                         if (temporary_storage == null) {
 892                                 temporary_storage = new Hashtable ();
 893                                 temporary_storage [t] = b;
 894                                 return;
 895                         }
 896                         object o = temporary_storage [t];
 897                         if (o == null) {
 898                                 temporary_storage [t] = b;
 899                                 return;
 900                         }
 901                         if (o is Stack) {
 902                                 s = (Stack) o;
 903                         } else {
 904                                 s = new Stack ();
 905                                 s.Push (o);
 906                                 temporary_storage [t] = s;
 907                         }
 908                         s.Push (b);
 909                 }
 910
 911                 /// <summary>
 912                 ///   Current loop begin and end labels.
 913                 /// </summary>
 914                 public Label LoopBegin, LoopEnd;
 915
 916                 /// <summary>
 917                 ///   Default target in a switch statement.   Only valid if
 918                 ///   InSwitch is true
 919                 /// </summary>
 920                 public Label DefaultTarget;
 921
 922                 /// <summary>
 923                 ///   If this is non-null, points to the current switch statement
 924                 /// </summary>
 925                 public Switch Switch;
 926
 927                 /// <summary>
 928                 ///   ReturnValue creates on demand the LocalBuilder for the
 929                 ///   return value from the function.  By default this is not
 930                 ///   used.  This is only required when returns are found inside
 931                 ///   Try or Catch statements.
 932                 ///
 933                 ///   This method is typically invoked from the Emit phase, so
 934                 ///   we allow the creation of a return label if it was not
 935                 ///   requested during the resolution phase.   Could be cleaned
 936                 ///   up, but it would replicate a lot of logic in the Emit phase
 937                 ///   of the code that uses it.
 938                 /// </summary>
 939                 public LocalBuilder TemporaryReturn ()
 940                 {
 941                         if (return_value == null){
 942                                 return_value = ig.DeclareLocal (ReturnType);
 943                                 if (!HasReturnLabel){
 944                                         ReturnLabel = ig.DefineLabel ();
 945                                         HasReturnLabel = true;
 946                                 }
 947                         }
 948
 949                         return return_value;
 950                 }
 951
 952                 /// <summary>
 953                 ///   This method is used during the Resolution phase to flag the
 954                 ///   need to define the ReturnLabel
 955                 /// </summary>
 956                 public void NeedReturnLabel ()
 957                 {
 958                         if (current_phase != Phase.Resolving){
 959                                 //
 960                                 // The reason is that the `ReturnLabel' is declared between
 961                                 // resolution and emission
 962                                 //
 963                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 964                         }
 965
 966                         if (!InIterator && !HasReturnLabel)
 967                                 HasReturnLabel = true;
 968                 }
 969
 970                 //
 971                 // Emits the proper object to address fields on a remapped
 972                 // variable/parameter to field in anonymous-method/iterator proxy classes.
 973                 //
 974                 public void EmitThis (bool need_address)
 975                 {
 976                         ig.Emit (OpCodes.Ldarg_0);
 977                         if (capture_context != null && CurrentAnonymousMethod != null){
 978                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
 979                                 while (si != null){
 980                                         if (si.ParentLink != null)
 981                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
 982                                         if (si.THIS != null){
 983                                                 if (need_address && TypeManager.IsValueType (si.THIS.FieldType))
 984                                                         ig.Emit (OpCodes.Ldflda, si.THIS);
 985                                                 else
 986                                                         ig.Emit (OpCodes.Ldfld, si.THIS);
 987                                                 break;
 988                                         }
 989                                         si = si.ParentScope;
 990                                 }
 991                         }
 992                 }
 993
 994                 //
 995                 // Emits the code necessary to load the instance required
 996                 // to access the captured LocalInfo
 997                 //
 998                 public void EmitCapturedVariableInstance (LocalInfo li)
 999                 {
1000                         if (capture_context == null)
1001                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
1002
1003                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1004                 }
1005
1006                 public void EmitParameter (string name, bool leave_copy, bool prepared, ref LocalTemporary temp)
1007                 {
1008                         capture_context.EmitParameter (this, name, leave_copy, prepared, ref temp);
1009                 }
1010
1011                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load, ref LocalTemporary  temp)
1012                 {
1013                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load, ref temp);
1014                 }
1015
1016                 public void EmitAddressOfParameter (string name)
1017                 {
1018                         capture_context.EmitAddressOfParameter (this, name);
1019                 }
1020
1021                 public Expression GetThis (Location loc)
1022                 {
1023                         This my_this;
1024                         if (CurrentBlock != null)
1025                                 my_this = new This (CurrentBlock, loc);
1026                         else
1027                                 my_this = new This (loc);
1028
1029                         if (!my_this.ResolveBase (this))
1030                                 my_this = null;
1031
1032                         return my_this;
1033                 }
1034         }
1035
1036
1037         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
1038
1039                 protected CommonAssemblyModulClass ():
1040                         base (null)
1041                 {
1042                 }
1043
1044                 public void AddAttributes (ArrayList attrs)
1045                 {
1046                         foreach (Attribute a in attrs)
1047                                 a.AttachTo (this);
1048
1049                         if (attributes == null) {
1050                                 attributes = new Attributes (attrs);
1051                                 return;
1052                         }
1053                         attributes.AddAttributes (attrs);
1054                 }
1055
1056                 public virtual void Emit (TypeContainer tc)
1057                 {
1058                         if (OptAttributes == null)
1059                                 return;
1060
1061                         OptAttributes.Emit ();
1062                 }
1063
1064                 protected Attribute ResolveAttribute (Type a_type)
1065                 {
1066                         if (OptAttributes == null)
1067                                 return null;
1068
1069                         // Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
1070                         if (!OptAttributes.CheckTargets ())
1071                                 return null;
1072
1073                         Attribute a = OptAttributes.Search (a_type);
1074                         if (a != null) {
1075                                 a.Resolve ();
1076                         }
1077                         return a;
1078                 }
1079
1080                 public override IResolveContext ResolveContext {
1081                         get { return this; }
1082                 }
1083
1084                 #region IResolveContext Members
1085
1086                 public DeclSpace DeclContainer {
1087                         get { return RootContext.ToplevelTypes; }
1088                 }
1089
1090                 public bool IsInObsoleteScope {
1091                         get { return false; }
1092                 }
1093
1094                 public bool IsInUnsafeScope {
1095                         get { return false; }
1096                 }
1097
1098                 #endregion
1099         }
1100
1101         public class AssemblyClass : CommonAssemblyModulClass {
1102                 // TODO: make it private and move all builder based methods here
1103                 public AssemblyBuilder Builder;
1104                 bool is_cls_compliant;
1105                 bool wrap_non_exception_throws;
1106
1107                 public Attribute ClsCompliantAttribute;
1108
1109                 ListDictionary declarative_security;
1110
1111                 // Module is here just because of error messages
1112                 static string[] attribute_targets = new string [] { "assembly", "module" };
1113
1114                 public AssemblyClass (): base ()
1115                 {
1116                         wrap_non_exception_throws = true;
1117                 }
1118
1119                 public bool IsClsCompliant {
1120                         get {
1121                                 return is_cls_compliant;
1122                         }
1123                 }
1124
1125                 public bool WrapNonExceptionThrows {
1126                         get {
1127                                 return wrap_non_exception_throws;
1128                         }
1129                 }
1130
1131                 public override AttributeTargets AttributeTargets {
1132                         get {
1133                                 return AttributeTargets.Assembly;
1134                         }
1135                 }
1136
1137                 public override bool IsClsComplianceRequired ()
1138                 {
1139                         return is_cls_compliant;
1140                 }
1141
1142                 public void Resolve ()
1143                 {
1144                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1145                         if (ClsCompliantAttribute != null) {
1146                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1147                         }
1148
1149 #if NET_2_0
1150                         Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
1151                         if (a != null) {
1152                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1153                                 if (val != null)
1154                                         wrap_non_exception_throws = (bool)val;
1155                         }
1156 #endif
1157                 }
1158
1159                 // fix bug #56621
1160                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1161                 {
1162                         try {
1163                                 // check for possible ECMA key
1164                                 if (strongNameBlob.Length == 16) {
1165                                         // will be rejected if not "the" ECMA key
1166                                         an.SetPublicKey (strongNameBlob);
1167                                 }
1168                                 else {
1169                                         // take it, with or without, a private key
1170                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1171                                         // and make sure we only feed the public part to Sys.Ref
1172                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1173
1174                                         // AssemblyName.SetPublicKey requires an additional header
1175                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1176
1177                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1178                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1179                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1180                                         an.SetPublicKey (encodedPublicKey);
1181                                 }
1182                         }
1183                         catch (Exception) {
1184                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1185                                 Environment.Exit (1);
1186                         }
1187                 }
1188
1189                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1190                 public AssemblyName GetAssemblyName (string name, string output)
1191                 {
1192                         if (OptAttributes != null) {
1193                                 foreach (Attribute a in OptAttributes.Attrs) {
1194                                         // cannot rely on any resolve-based members before you call Resolve
1195                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1196                                                 continue;
1197
1198                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1199                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1200                                         //       are loaded yet.
1201                                         // TODO: Does not handle quoted attributes properly
1202                                         switch (a.Name) {
1203                                                 case "AssemblyKeyFile":
1204                                                 case "AssemblyKeyFileAttribute":
1205                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1206                                                         if (RootContext.StrongNameKeyFile != null) {
1207                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1208                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1209                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1210                                                         }
1211                                                         else {
1212                                                                 string value = a.GetString ();
1213                                                                 if (value.Length != 0)
1214                                                                         RootContext.StrongNameKeyFile = value;
1215                                                         }
1216                                                         break;
1217                                                 case "AssemblyKeyName":
1218                                                 case "AssemblyKeyNameAttribute":
1219                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1220                                                         if (RootContext.StrongNameKeyContainer != null) {
1221                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1222                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1223                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1224                                                         }
1225                                                         else {
1226                                                                 string value = a.GetString ();
1227                                                                 if (value.Length != 0)
1228                                                                         RootContext.StrongNameKeyContainer = value;
1229                                                         }
1230                                                         break;
1231                                                 case "AssemblyDelaySign":
1232                                                 case "AssemblyDelaySignAttribute":
1233                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1234                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1235                                                         break;
1236                                         }
1237                                 }
1238                         }
1239
1240                         AssemblyName an = new AssemblyName ();
1241                         an.Name = Path.GetFileNameWithoutExtension (name);
1242
1243                         // note: delay doesn't apply when using a key container
1244                         if (RootContext.StrongNameKeyContainer != null) {
1245                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1246                                 return an;
1247                         }
1248
1249                         // strongname is optional
1250                         if (RootContext.StrongNameKeyFile == null)
1251                                 return an;
1252
1253                         string AssemblyDir = Path.GetDirectoryName (output);
1254
1255                         // the StrongName key file may be relative to (a) the compiled
1256                         // file or (b) to the output assembly. See bugzilla #55320
1257                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1258
1259                         // (a) relative to the compiled file
1260                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1261                         bool exist = File.Exists (filename);
1262                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1263                                 // (b) relative to the outputed assembly
1264                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1265                                 exist = File.Exists (filename);
1266                         }
1267
1268                         if (exist) {
1269                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1270                                         byte[] snkeypair = new byte [fs.Length];
1271                                         fs.Read (snkeypair, 0, snkeypair.Length);
1272
1273                                         if (RootContext.StrongNameDelaySign) {
1274                                                 // delayed signing - DO NOT include private key
1275                                                 SetPublicKey (an, snkeypair);
1276                                         }
1277                                         else {
1278                                                 // no delay so we make sure we have the private key
1279                                                 try {
1280                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1281                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1282                                                 }
1283                                                 catch (CryptographicException) {
1284                                                         if (snkeypair.Length == 16) {
1285                                                                 // error # is different for ECMA key
1286                                                                 Report.Error (1606, "Could not sign the assembly. " +
1287                                                                         "ECMA key can only be used to delay-sign assemblies");
1288                                                         }
1289                                                         else {
1290                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1291                                                         }
1292                                                         return null;
1293                                                 }
1294                                         }
1295                                 }
1296                         }
1297                         else {
1298                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1299                                 return null;
1300                         }
1301                         return an;
1302                 }
1303
1304                 void Error_AssemblySigning (string text)
1305                 {
1306                         Report.Error (1548, "Error during assembly signing. " + text);
1307                 }
1308
1309                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1310                 {
1311                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1312                                 if (declarative_security == null)
1313                                         declarative_security = new ListDictionary ();
1314
1315                                 a.ExtractSecurityPermissionSet (declarative_security);
1316                                 return;
1317                         }
1318
1319                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1320                                 string value = a.GetString ();
1321                                 if (value == null || value.Length == 0)
1322                                         return;
1323
1324                                 if (RootContext.Target == Target.Exe) {
1325                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1326                                         return;
1327                                 }
1328                         }
1329
1330                         Builder.SetCustomAttribute (customBuilder);
1331                 }
1332
1333                 public override void Emit (TypeContainer tc)
1334                 {
1335                         base.Emit (tc);
1336
1337                         if (declarative_security != null) {
1338
1339                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1340                                 object builder_instance = Builder;
1341
1342                                 try {
1343                                         // Microsoft runtime hacking
1344                                         if (add_permission == null) {
1345                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1346                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1347
1348                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1349                                                 builder_instance = fi.GetValue (Builder);
1350                                         }
1351
1352                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1353                                                                                                   declarative_security [SecurityAction.RequestOptional],
1354                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1355                                         add_permission.Invoke (builder_instance, args);
1356                                 }
1357                                 catch {
1358                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1359                                 }
1360                         }
1361                 }
1362
1363                 public override string[] ValidAttributeTargets {
1364                         get {
1365                                 return attribute_targets;
1366                         }
1367                 }
1368         }
1369
1370         public class ModuleClass : CommonAssemblyModulClass {
1371                 // TODO: make it private and move all builder based methods here
1372                 public ModuleBuilder Builder;
1373                 bool m_module_is_unsafe;
1374
1375                 public CharSet DefaultCharSet = CharSet.Ansi;
1376                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1377
1378                 static string[] attribute_targets = new string [] { "module" };
1379
1380                 public ModuleClass (bool is_unsafe)
1381                 {
1382                         m_module_is_unsafe = is_unsafe;
1383                 }
1384
1385                 public override AttributeTargets AttributeTargets {
1386                         get {
1387                                 return AttributeTargets.Module;
1388                         }
1389                 }
1390
1391                 public override bool IsClsComplianceRequired ()
1392                 {
1393                         return CodeGen.Assembly.IsClsCompliant;
1394                 }
1395
1396                 public override void Emit (TypeContainer tc)
1397                 {
1398                         base.Emit (tc);
1399
1400                         if (!m_module_is_unsafe)
1401                                 return;
1402
1403                         if (TypeManager.unverifiable_code_ctor == null) {
1404                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1405                                 return;
1406                         }
1407
1408                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1409                 }
1410
1411                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1412                 {
1413                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1414                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1415                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1416                                 }
1417                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1418                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1419                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1420                                         return;
1421                                 }
1422                         }
1423
1424                         Builder.SetCustomAttribute (customBuilder);
1425                 }
1426
1427                 /// <summary>
1428                 /// It is called very early therefore can resolve only predefined attributes
1429                 /// </summary>
1430                 public void ResolveAttributes ()
1431                 {
1432 #if NET_2_0
1433                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1434                         if (a != null) {
1435                                 DefaultCharSet = a.GetCharSetValue ();
1436                                 switch (DefaultCharSet) {
1437                                         case CharSet.Ansi:
1438                                         case CharSet.None:
1439                                                 break;
1440                                         case CharSet.Auto:
1441                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1442                                                 break;
1443                                         case CharSet.Unicode:
1444                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1445                                                 break;
1446                                         default:
1447                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1448                                                 break;
1449                                 }
1450                         }
1451 #endif
1452                 }
1453
1454                 public override string[] ValidAttributeTargets {
1455                         get {
1456                                 return attribute_targets;
1457                         }
1458                 }
1459         }
1460 }