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 //
  12 // Please leave this defined on SVN: The idea is that when we ship the
  13 // compiler to end users, if the compiler crashes, they have a chance
  14 // to narrow down the problem.
  15 //
  16 // Only remove it if you need to debug locally on your tree.
  17 //
  18 #define PRODUCTION
  19
  20 using System;
  21 using System.IO;
  22 using System.Collections;
  23 using System.Collections.Specialized;
  24 using System.Reflection;
  25 using System.Reflection.Emit;
  26 using System.Runtime.InteropServices;
  27 using System.Security;
  28 using System.Security.Cryptography;
  29 using System.Security.Permissions;
  30
  31 using Mono.Security.Cryptography;
  32
  33 namespace Mono.CSharp {
  34
  35         /// <summary>
  36         ///    Code generator class.
  37         /// </summary>
  38         public class CodeGen {
  39                 static AppDomain current_domain;
  40                 static public SymbolWriter SymbolWriter;
  41
  42                 public static AssemblyClass Assembly;
  43                 public static ModuleClass Module;
  44
  45                 static CodeGen ()
  46                 {
  47                         Reset ();
  48                 }
  49
  50                 public static void Reset ()
  51                 {
  52                         Assembly = new AssemblyClass ();
  53                         Module = new ModuleClass (RootContext.Unsafe);
  54                 }
  55
  56                 public static string Basename (string name)
  57                 {
  58                         int pos = name.LastIndexOf ('/');
  59
  60                         if (pos != -1)
  61                                 return name.Substring (pos + 1);
  62
  63                         pos = name.LastIndexOf ('\\');
  64                         if (pos != -1)
  65                                 return name.Substring (pos + 1);
  66
  67                         return name;
  68                 }
  69
  70                 public static string Dirname (string name)
  71                 {
  72                         int pos = name.LastIndexOf ('/');
  73
  74                         if (pos != -1)
  75                                 return name.Substring (0, pos);
  76
  77                         pos = name.LastIndexOf ('\\');
  78                         if (pos != -1)
  79                                 return name.Substring (0, pos);
  80
  81                         return ".";
  82                 }
  83
  84                 static public string FileName;
  85
  86                 //
  87                 // Initializes the symbol writer
  88                 //
  89                 static void InitializeSymbolWriter (string filename)
  90                 {
  91                         SymbolWriter = SymbolWriter.GetSymbolWriter (Module.Builder, filename);
  92
  93                         //
  94                         // If we got an ISymbolWriter instance, initialize it.
  95                         //
  96                         if (SymbolWriter == null) {
  97                                 Report.Warning (
  98                                         -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.");
  99                                 return;
 100                         }
 101                 }
 102
 103                 //
 104                 // Initializes the code generator variables
 105                 //
 106                 static public bool Init (string name, string output, bool want_debugging_support)
 107                 {
 108                         FileName = output;
 109                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 110                         if (an == null)
 111                                 return false;
 112
 113                         if (an.KeyPair != null) {
 114                                 // If we are going to strong name our assembly make
 115                                 // sure all its refs are strong named
 116                                 foreach (Assembly a in RootNamespace.Global.Assemblies) {
 117                                         AssemblyName ref_name = a.GetName ();
 118                                         byte [] b = ref_name.GetPublicKeyToken ();
 119                                         if (b == null || b.Length == 0) {
 120                                                 Report.Error (1577, "Assembly generation failed " +
 121                                                                 "-- Referenced assembly '" +
 122                                                                 ref_name.Name +
 123                                                                 "' does not have a strong name.");
 124                                                 //Environment.Exit (1);
 125                                         }
 126                                 }
 127                         }
 128
 129                         current_domain = AppDomain.CurrentDomain;
 130
 131                         try {
 132                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 133                                         AssemblyBuilderAccess.Save, Dirname (name));
 134                         }
 135                         catch (ArgumentException) {
 136                                 // specified key may not be exportable outside it's container
 137                                 if (RootContext.StrongNameKeyContainer != null) {
 138                                         Report.Error (1548, "Could not access the key inside the container `" +
 139                                                 RootContext.StrongNameKeyContainer + "'.");
 140                                         Environment.Exit (1);
 141                                 }
 142                                 return false;
 143                         }
 144                         catch (CryptographicException) {
 145                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 146                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 147                                         Environment.Exit (1);
 148                                 }
 149                                 return false;
 150                         }
 151
 152 #if GMCS_SOURCE
 153                         // Get the complete AssemblyName from the builder
 154                         // (We need to get the public key and token)
 155                         Assembly.Name = Assembly.Builder.GetName ();
 156 #endif
 157
 158                         //
 159                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 160                         // this copes with output in different directories then.
 161                         // FIXME: figure out how this copes with --output /tmp/blah
 162                         //
 163                         // If the third argument is true, the ModuleBuilder will dynamically
 164                         // load the default symbol writer.
 165                         //
 166                         Module.Builder = Assembly.Builder.DefineDynamicModule (
 167                                 Basename (name), Basename (output), false);
 168
 169                         if (want_debugging_support)
 170                                 InitializeSymbolWriter (output);
 171
 172                         return true;
 173                 }
 174
 175                 static public void Save (string name)
 176                 {
 177                         try {
 178                                 Assembly.Builder.Save (Basename (name));
 179
 180                                 if (SymbolWriter != null)
 181                                         SymbolWriter.WriteSymbolFile ();
 182                         }
 183                         catch (COMException) {
 184                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 185                                         throw;
 186
 187                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 188                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 189                                         RootContext.StrongNameKeyFile +
 190                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 191                         }
 192                         catch (System.IO.IOException io) {
 193                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 194                         }
 195                         catch (System.UnauthorizedAccessException ua) {
 196                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 197                         }
 198                 }
 199         }
 200
 201
 202         public interface IResolveContext
 203         {
 204                 DeclSpace DeclContainer { get; }
 205                 bool IsInObsoleteScope { get; }
 206                 bool IsInUnsafeScope { get; }
 207
 208                 // the declcontainer to lookup for type-parameters.  Should only use LookupGeneric on it.
 209                 //
 210                 // FIXME: This is somewhat of a hack.  We don't need a full DeclSpace for this.  We just need the
 211                 //        current type parameters in scope. IUIC, that will require us to rewrite GenericMethod.
 212                 //        Maybe we can replace this with a 'LookupGeneric (string)' instead, but we'll have to
 213                 //        handle generic method overrides differently
 214                 DeclSpace GenericDeclContainer { get; }
 215         }
 216
 217         /// <summary>
 218         ///   An Emit Context is created for each body of code (from methods,
 219         ///   properties bodies, indexer bodies or constructor bodies)
 220         /// </summary>
 221         public class EmitContext : IResolveContext {
 222
 223                 DeclSpace declSpace;
 224                 public DeclSpace TypeContainer;
 225                 public ILGenerator   ig;
 226
 227                 [Flags]
 228                 public enum Flags : byte {
 229                         /// <summary>
 230                         ///   This flag tracks the `checked' state of the compilation,
 231                         ///   it controls whether we should generate code that does overflow
 232                         ///   checking, or if we generate code that ignores overflows.
 233                         ///
 234                         ///   The default setting comes from the command line option to generate
 235                         ///   checked or unchecked code plus any source code changes using the
 236                         ///   checked/unchecked statements or expressions.   Contrast this with
 237                         ///   the ConstantCheckState flag.
 238                         /// </summary>
 239                         CheckState = 1 << 0,
 240
 241                         /// <summary>
 242                         ///   The constant check state is always set to `true' and cant be changed
 243                         ///   from the command line.  The source code can change this setting with
 244                         ///   the `checked' and `unchecked' statements and expressions.
 245                         /// </summary>
 246                         ConstantCheckState = 1 << 1,
 247
 248                         AllCheckStateFlags = CheckState | ConstantCheckState,
 249
 250                         /// <summary>
 251                         ///  Whether we are inside an unsafe block
 252                         /// </summary>
 253                         InUnsafe = 1 << 2,
 254
 255                         InCatch = 1 << 3,
 256                         InFinally = 1 << 4,
 257
 258                         /// <summary>
 259                         ///   Whether control flow analysis is enabled
 260                         /// </summary>
 261                         DoFlowAnalysis = 1 << 5,
 262
 263                         /// <summary>
 264                         ///   Whether control flow analysis is disabled on structs
 265                         ///   (only meaningful when DoFlowAnalysis is set)
 266                         /// </summary>
 267                         OmitStructFlowAnalysis = 1 << 6
 268                 }
 269
 270                 Flags flags;
 271
 272                 /// <summary>
 273                 ///   Whether we are emitting code inside a static or instance method
 274                 /// </summary>
 275                 public bool IsStatic;
 276
 277                 /// <summary>
 278                 ///   Whether the actual created method is static or instance method.
 279                 ///   Althoug the method might be declared as `static', if an anonymous
 280                 ///   method is involved, we might turn this into an instance method.
 281                 ///
 282                 ///   So this reflects the low-level staticness of the method, while
 283                 ///   IsStatic represents the semantic, high-level staticness.
 284                 /// </summary>
 285                 public bool MethodIsStatic;
 286
 287                 /// <summary>
 288                 ///   Whether we are emitting a field initializer
 289                 /// </summary>
 290                 public bool IsFieldInitializer;
 291
 292                 /// <summary>
 293                 ///   The value that is allowed to be returned or NULL if there is no
 294                 ///   return type.
 295                 /// </summary>
 296                 public readonly Type ReturnType;
 297
 298                 /// <summary>
 299                 ///   Points to the Type (extracted from the TypeContainer) that
 300                 ///   declares this body of code
 301                 /// </summary>
 302                 public Type ContainerType;
 303
 304                 /// <summary>
 305                 ///   Whether this is generating code for a constructor
 306                 /// </summary>
 307                 public bool IsConstructor;
 308
 309                 /// <summary>
 310                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 311                 ///   to store structures (used to compute the address of the structure
 312                 ///   value on structure method invocations)
 313                 /// </summary>
 314                 public Hashtable temporary_storage;
 315
 316                 public Block CurrentBlock;
 317
 318                 public int CurrentFile;
 319
 320                 /// <summary>
 321                 ///   The location where we store the return value.
 322                 /// </summary>
 323                 LocalBuilder return_value;
 324
 325                 /// <summary>
 326                 ///   The location where return has to jump to return the
 327                 ///   value
 328                 /// </summary>
 329                 public Label ReturnLabel;
 330
 331                 /// <summary>
 332                 ///   If we already defined the ReturnLabel
 333                 /// </summary>
 334                 public bool HasReturnLabel;
 335
 336                 /// <summary>
 337                 ///   Whether we are inside an iterator block.
 338                 /// </summary>
 339                 public bool InIterator;
 340
 341                 public bool IsLastStatement;
 342
 343                 /// <summary>
 344                 ///  Whether we are in a `fixed' initialization
 345                 /// </summary>
 346                 public bool InFixedInitializer;
 347
 348                 /// <summary>
 349                 ///  Whether we are inside an anonymous method.
 350                 /// </summary>
 351                 public AnonymousContainer CurrentAnonymousMethod;
 352
 353                 /// <summary>
 354                 ///   Location for this EmitContext
 355                 /// </summary>
 356                 public Location loc;
 357
 358                 /// <summary>
 359                 ///   Inside an enum definition, we do not resolve enumeration values
 360                 ///   to their enumerations, but rather to the underlying type/value
 361                 ///   This is so EnumVal + EnumValB can be evaluated.
 362                 ///
 363                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 364                 ///   we relax the rules
 365                 /// </summary>
 366                 public bool InEnumContext;
 367
 368                 public readonly IResolveContext ResolveContext;
 369
 370                 /// <summary>
 371                 ///    The current iterator
 372                 /// </summary>
 373                 public Iterator CurrentIterator {
 374                         get { return CurrentAnonymousMethod as Iterator; }
 375                 }
 376
 377                 /// <summary>
 378                 ///    Whether we are in the resolving stage or not
 379                 /// </summary>
 380                 enum Phase {
 381                         Created,
 382                         Resolving,
 383                         Emitting
 384                 }
 385
 386                 bool isAnonymousMethodAllowed = true;
 387
 388                 Phase current_phase;
 389                 FlowBranching current_flow_branching;
 390
 391                 static int next_id = 0;
 392                 int id = ++next_id;
 393
 394                 public override string ToString ()
 395                 {
 396                         return String.Format ("EmitContext ({0}:{1})", id,
 397                                               CurrentAnonymousMethod, loc);
 398                 }
 399
 400                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 401                                     Type return_type, int code_flags, bool is_constructor)
 402                 {
 403                         this.ResolveContext = rc;
 404                         this.ig = ig;
 405
 406                         TypeContainer = parent;
 407                         this.declSpace = ds;
 408                         if (RootContext.Checked)
 409                                 flags |= Flags.CheckState;
 410                         flags |= Flags.ConstantCheckState;
 411
 412 #if GMCS_SOURCE
 413                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 414                                 throw new InternalErrorException ();
 415 #endif
 416
 417                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 418                         MethodIsStatic = IsStatic;
 419                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 420                         ReturnType = return_type;
 421                         IsConstructor = is_constructor;
 422                         CurrentBlock = null;
 423                         CurrentFile = 0;
 424                         current_phase = Phase.Created;
 425
 426                         if (parent != null){
 427                                 // Can only be null for the ResolveType contexts.
 428                                 ContainerType = parent.TypeBuilder;
 429                                 if (rc.IsInUnsafeScope)
 430                                         flags |= Flags.InUnsafe;
 431                         }
 432                         loc = l;
 433
 434                         if (ReturnType == TypeManager.void_type)
 435                                 ReturnType = null;
 436                 }
 437
 438                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 439                                     Type return_type, int code_flags, bool is_constructor)
 440                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 441                 {
 442                 }
 443
 444                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 445                                     Type return_type, int code_flags)
 446                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 447                 {
 448                 }
 449
 450                 public DeclSpace DeclContainer {
 451                         get { return declSpace; }
 452                         set { declSpace = value; }
 453                 }
 454
 455                 public DeclSpace GenericDeclContainer {
 456                         get { return DeclContainer; }
 457                 }
 458
 459                 public bool CheckState {
 460                         get { return (flags & Flags.CheckState) != 0; }
 461                 }
 462
 463                 public bool ConstantCheckState {
 464                         get { return (flags & Flags.ConstantCheckState) != 0; }
 465                 }
 466
 467                 public bool InUnsafe {
 468                         get { return (flags & Flags.InUnsafe) != 0; }
 469                 }
 470
 471                 public bool InCatch {
 472                         get { return (flags & Flags.InCatch) != 0; }
 473                 }
 474
 475                 public bool InFinally {
 476                         get { return (flags & Flags.InFinally) != 0; }
 477                 }
 478
 479                 public bool DoFlowAnalysis {
 480                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 481                 }
 482
 483                 public bool OmitStructFlowAnalysis {
 484                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 485                 }
 486
 487                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 488                 // it's public so that we can use a struct at the callsite
 489                 public struct FlagsHandle : IDisposable
 490                 {
 491                         EmitContext ec;
 492                         Flags invmask, oldval;
 493                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 494                         {
 495                                 this.ec = ec;
 496                                 invmask = ~mask;
 497                                 oldval = ec.flags & mask;
 498                                 ec.flags = (ec.flags & invmask) | (val & mask);
 499                         }
 500                         public void Dispose ()
 501                         {
 502                                 ec.flags = (ec.flags & invmask) | oldval;
 503                         }
 504                 }
 505
 506                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 507                 public FlagsHandle With (Flags bits, bool enable)
 508                 {
 509                         return new FlagsHandle (this, bits, enable ? bits : 0);
 510                 }
 511
 512                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 513                 {
 514                         Flags newflags =
 515                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 516                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 517                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 518                 }
 519
 520                 public bool IsInObsoleteScope {
 521                         get { return ResolveContext.IsInObsoleteScope; }
 522                 }
 523
 524                 public bool IsInUnsafeScope {
 525                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 526                 }
 527
 528                 public bool IsAnonymousMethodAllowed {
 529                         get { return isAnonymousMethodAllowed; }
 530                         set { isAnonymousMethodAllowed = value; }
 531                 }
 532
 533                 public FlowBranching CurrentBranching {
 534                         get { return current_flow_branching; }
 535                 }
 536
 537                 // <summary>
 538                 //   Starts a new code branching.  This inherits the state of all local
 539                 //   variables and parameters from the current branching.
 540                 // </summary>
 541                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 542                 {
 543                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 544                         return current_flow_branching;
 545                 }
 546
 547                 // <summary>
 548                 //   Starts a new code branching for block `block'.
 549                 // </summary>
 550                 public FlowBranching StartFlowBranching (Block block)
 551                 {
 552                         FlowBranching.BranchingType type;
 553
 554                         if ((CurrentBranching != null) &&
 555                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 556                                 type = FlowBranching.BranchingType.SwitchSection;
 557                         else
 558                                 type = FlowBranching.BranchingType.Block;
 559
 560                         flags |= Flags.DoFlowAnalysis;
 561
 562                         current_flow_branching = FlowBranching.CreateBranching (
 563                                 CurrentBranching, type, block, block.StartLocation);
 564                         return current_flow_branching;
 565                 }
 566
 567                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 568                 {
 569                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 570                         current_flow_branching = branching;
 571                         return branching;
 572                 }
 573
 574                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 575                 {
 576                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 577                         current_flow_branching = branching;
 578                         return branching;
 579                 }
 580
 581                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 582                 {
 583                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 584                         current_flow_branching = branching;
 585                         return branching;
 586                 }
 587
 588                 // <summary>
 589                 //   Ends a code branching.  Merges the state of locals and parameters
 590                 //   from all the children of the ending branching.
 591                 // </summary>
 592                 public FlowBranching.UsageVector DoEndFlowBranching ()
 593                 {
 594                         FlowBranching old = current_flow_branching;
 595                         current_flow_branching = current_flow_branching.Parent;
 596
 597                         return current_flow_branching.MergeChild (old);
 598                 }
 599
 600                 // <summary>
 601                 //   Ends a code branching.  Merges the state of locals and parameters
 602                 //   from all the children of the ending branching.
 603                 // </summary>
 604                 public FlowBranching.Reachability EndFlowBranching ()
 605                 {
 606                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 607
 608                         return vector.Reachability;
 609                 }
 610
 611                 // <summary>
 612                 //   Kills the current code branching.  This throws away any changed state
 613                 //   information and should only be used in case of an error.
 614                 // </summary>
 615                 public void KillFlowBranching ()
 616                 {
 617                         current_flow_branching = current_flow_branching.Parent;
 618                 }
 619
 620                 public bool MustCaptureVariable (LocalInfo local)
 621                 {
 622                         if (CurrentAnonymousMethod == null)
 623                                 return false;
 624                         if (CurrentAnonymousMethod.IsIterator)
 625                                 return true;
 626                         return local.Block.Toplevel != CurrentBlock.Toplevel;
 627                 }
 628
 629                 public void EmitMeta (ToplevelBlock b)
 630                 {
 631                         b.EmitMeta (this);
 632
 633                         if (HasReturnLabel)
 634                                 ReturnLabel = ig.DefineLabel ();
 635                 }
 636
 637                 //
 638                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 639                 // currently can not cope with ig == null during resolve (which must
 640                 // be fixed for switch statements to work on anonymous methods).
 641                 //
 642                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 643                 {
 644                         if (block == null)
 645                                 return;
 646
 647                         bool unreachable;
 648
 649                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 650                                 EmitMeta (block);
 651
 652                                 current_phase = Phase.Emitting;
 653                                 EmitResolvedTopBlock (block, unreachable);
 654                         }
 655                 }
 656
 657                 bool resolved;
 658
 659                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 660                                              Parameters ip, IMethodData md, out bool unreachable)
 661                 {
 662                         current_phase = Phase.Resolving;
 663
 664                         unreachable = false;
 665
 666                         if (resolved)
 667                                 return true;
 668
 669                         if (!loc.IsNull)
 670                                 CurrentFile = loc.File;
 671
 672 #if PRODUCTION
 673                         try {
 674 #endif
 675                                 if (!block.ResolveMeta (this, ip))
 676                                         return false;
 677
 678                                 if ((md != null) && (md.Iterator != null)) {
 679                                         if (!md.Iterator.Resolve (this))
 680                                                 return false;
 681                                 }
 682
 683                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 684                                         FlowBranchingToplevel top_level;
 685                                         if (anonymous_method_host != null)
 686                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 687                                         else
 688                                                 top_level = block.TopLevelBranching;
 689
 690                                         current_flow_branching = top_level;
 691                                         bool ok = block.Resolve (this);
 692                                         current_flow_branching = null;
 693
 694                                         if (!ok)
 695                                                 return false;
 696
 697                                         FlowBranching.Reachability reachability = top_level.End ();
 698                                         if (reachability.IsUnreachable)
 699                                                 unreachable = true;
 700                                 }
 701 #if PRODUCTION
 702                         } catch (Exception e) {
 703                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 704                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 705
 706                                 if (CurrentBlock != null){
 707                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 708                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 709                                 }
 710                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 711                                 throw;
 712                         }
 713 #endif
 714
 715                         if (ReturnType != null && !unreachable) {
 716                                 if (CurrentAnonymousMethod == null) {
 717                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 718                                         return false;
 719                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 720                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 721                                                       CurrentAnonymousMethod.GetSignatureForError ());
 722                                         return false;
 723                                 }
 724                         }
 725
 726                         if (!block.CompleteContexts (this))
 727                                 return false;
 728
 729                         resolved = true;
 730                         return true;
 731                 }
 732
 733                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 734                 {
 735                         if (block != null)
 736                                 block.Emit (this);
 737
 738                         if (HasReturnLabel)
 739                                 ig.MarkLabel (ReturnLabel);
 740
 741                         if (return_value != null){
 742                                 ig.Emit (OpCodes.Ldloc, return_value);
 743                                 ig.Emit (OpCodes.Ret);
 744                         } else {
 745                                 //
 746                                 // If `HasReturnLabel' is set, then we already emitted a
 747                                 // jump to the end of the method, so we must emit a `ret'
 748                                 // there.
 749                                 //
 750                                 // Unfortunately, System.Reflection.Emit automatically emits
 751                                 // a leave to the end of a finally block.  This is a problem
 752                                 // if no code is following the try/finally block since we may
 753                                 // jump to a point after the end of the method.
 754                                 // As a workaround, we're always creating a return label in
 755                                 // this case.
 756                                 //
 757
 758                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 759                                         CurrentAnonymousMethod.IsIterator && InIterator;
 760
 761                                 if ((block != null) && block.IsDestructor) {
 762                                         // Nothing to do; S.R.E automatically emits a leave.
 763                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 764                                         if (ReturnType != null)
 765                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 766                                         ig.Emit (OpCodes.Ret);
 767                                 }
 768                         }
 769                 }
 770
 771                 /// <summary>
 772                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 773                 ///   writer to which source line this opcode belongs.
 774                 /// </summary>
 775                 public void Mark (Location loc, bool check_file)
 776                 {
 777                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 778                                 return;
 779
 780                         if (check_file && (CurrentFile != loc.File))
 781                                 return;
 782
 783                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 784                 }
 785
 786                 public void DefineLocalVariable (string name, LocalBuilder builder)
 787                 {
 788                         if (CodeGen.SymbolWriter == null)
 789                                 return;
 790
 791                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 792                 }
 793
 794                 public void BeginScope ()
 795                 {
 796                         ig.BeginScope();
 797
 798                         if (CodeGen.SymbolWriter != null)
 799                                 CodeGen.SymbolWriter.OpenScope(ig);
 800                 }
 801
 802                 public void EndScope ()
 803                 {
 804                         ig.EndScope();
 805
 806                         if (CodeGen.SymbolWriter != null)
 807                                 CodeGen.SymbolWriter.CloseScope(ig);
 808                 }
 809
 810                 /// <summary>
 811                 ///   Returns a temporary storage for a variable of type t as
 812                 ///   a local variable in the current body.
 813                 /// </summary>
 814                 public LocalBuilder GetTemporaryLocal (Type t)
 815                 {
 816                         if (temporary_storage != null) {
 817                                 object o = temporary_storage [t];
 818                                 if (o != null) {
 819                                         if (o is Stack) {
 820                                                 Stack s = (Stack) o;
 821                                                 o = s.Count == 0 ? null : s.Pop ();
 822                                         } else {
 823                                                 temporary_storage.Remove (t);
 824                                         }
 825                                 }
 826                                 if (o != null)
 827                                         return (LocalBuilder) o;
 828                         }
 829                         return ig.DeclareLocal (t);
 830                 }
 831
 832                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 833                 {
 834                         Stack s;
 835
 836                         if (temporary_storage == null) {
 837                                 temporary_storage = new Hashtable ();
 838                                 temporary_storage [t] = b;
 839                                 return;
 840                         }
 841                         object o = temporary_storage [t];
 842                         if (o == null) {
 843                                 temporary_storage [t] = b;
 844                                 return;
 845                         }
 846                         if (o is Stack) {
 847                                 s = (Stack) o;
 848                         } else {
 849                                 s = new Stack ();
 850                                 s.Push (o);
 851                                 temporary_storage [t] = s;
 852                         }
 853                         s.Push (b);
 854                 }
 855
 856                 /// <summary>
 857                 ///   Current loop begin and end labels.
 858                 /// </summary>
 859                 public Label LoopBegin, LoopEnd;
 860
 861                 /// <summary>
 862                 ///   Default target in a switch statement.   Only valid if
 863                 ///   InSwitch is true
 864                 /// </summary>
 865                 public Label DefaultTarget;
 866
 867                 /// <summary>
 868                 ///   If this is non-null, points to the current switch statement
 869                 /// </summary>
 870                 public Switch Switch;
 871
 872                 /// <summary>
 873                 ///   ReturnValue creates on demand the LocalBuilder for the
 874                 ///   return value from the function.  By default this is not
 875                 ///   used.  This is only required when returns are found inside
 876                 ///   Try or Catch statements.
 877                 ///
 878                 ///   This method is typically invoked from the Emit phase, so
 879                 ///   we allow the creation of a return label if it was not
 880                 ///   requested during the resolution phase.   Could be cleaned
 881                 ///   up, but it would replicate a lot of logic in the Emit phase
 882                 ///   of the code that uses it.
 883                 /// </summary>
 884                 public LocalBuilder TemporaryReturn ()
 885                 {
 886                         if (return_value == null){
 887                                 return_value = ig.DeclareLocal (ReturnType);
 888                                 if (!HasReturnLabel){
 889                                         ReturnLabel = ig.DefineLabel ();
 890                                         HasReturnLabel = true;
 891                                 }
 892                         }
 893
 894                         return return_value;
 895                 }
 896
 897                 /// <summary>
 898                 ///   This method is used during the Resolution phase to flag the
 899                 ///   need to define the ReturnLabel
 900                 /// </summary>
 901                 public void NeedReturnLabel ()
 902                 {
 903                         if (current_phase != Phase.Resolving){
 904                                 //
 905                                 // The reason is that the `ReturnLabel' is declared between
 906                                 // resolution and emission
 907                                 //
 908                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 909                         }
 910
 911                         if (!InIterator && !HasReturnLabel)
 912                                 HasReturnLabel = true;
 913                 }
 914
 915
 916                 public Expression GetThis (Location loc)
 917                 {
 918                         This my_this;
 919                         if (CurrentBlock != null)
 920                                 my_this = new This (CurrentBlock, loc);
 921                         else
 922                                 my_this = new This (loc);
 923
 924                         if (!my_this.ResolveBase (this))
 925                                 my_this = null;
 926
 927                         return my_this;
 928                 }
 929         }
 930
 931
 932         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
 933
 934                 protected CommonAssemblyModulClass ():
 935                         base (null)
 936                 {
 937                 }
 938
 939                 public void AddAttributes (ArrayList attrs)
 940                 {
 941                         foreach (Attribute a in attrs)
 942                                 a.AttachTo (this);
 943
 944                         if (attributes == null) {
 945                                 attributes = new Attributes (attrs);
 946                                 return;
 947                         }
 948                         attributes.AddAttributes (attrs);
 949                 }
 950
 951                 public virtual void Emit (TypeContainer tc)
 952                 {
 953                         if (OptAttributes == null)
 954                                 return;
 955
 956                         OptAttributes.Emit ();
 957                 }
 958
 959                 protected Attribute ResolveAttribute (Type a_type)
 960                 {
 961                         Attribute a = OptAttributes.Search (a_type);
 962                         if (a != null) {
 963                                 a.Resolve ();
 964                         }
 965                         return a;
 966                 }
 967
 968                 public override IResolveContext ResolveContext {
 969                         get { return this; }
 970                 }
 971
 972                 #region IResolveContext Members
 973
 974                 public DeclSpace DeclContainer {
 975                         get { return RootContext.ToplevelTypes; }
 976                 }
 977
 978                 public DeclSpace GenericDeclContainer {
 979                         get { return DeclContainer; }
 980                 }
 981
 982                 public bool IsInObsoleteScope {
 983                         get { return false; }
 984                 }
 985
 986                 public bool IsInUnsafeScope {
 987                         get { return false; }
 988                 }
 989
 990                 #endregion
 991         }
 992
 993         public class AssemblyClass : CommonAssemblyModulClass {
 994                 // TODO: make it private and move all builder based methods here
 995                 public AssemblyBuilder Builder;
 996                 bool is_cls_compliant;
 997                 bool wrap_non_exception_throws;
 998
 999                 public Attribute ClsCompliantAttribute;
1000
1001                 ListDictionary declarative_security;
1002 #if GMCS_SOURCE
1003                 public AssemblyName Name;
1004                 MethodInfo add_type_forwarder;
1005                 ListDictionary emitted_forwarders;
1006 #endif
1007
1008                 // Module is here just because of error messages
1009                 static string[] attribute_targets = new string [] { "assembly", "module" };
1010
1011                 public AssemblyClass (): base ()
1012                 {
1013 #if GMCS_SOURCE
1014                         wrap_non_exception_throws = true;
1015 #endif
1016                 }
1017
1018                 public bool IsClsCompliant {
1019                         get {
1020                                 return is_cls_compliant;
1021                         }
1022                 }
1023
1024                 public bool WrapNonExceptionThrows {
1025                         get {
1026                                 return wrap_non_exception_throws;
1027                         }
1028                 }
1029
1030                 public override AttributeTargets AttributeTargets {
1031                         get {
1032                                 return AttributeTargets.Assembly;
1033                         }
1034                 }
1035
1036                 public override bool IsClsComplianceRequired ()
1037                 {
1038                         return is_cls_compliant;
1039                 }
1040
1041                 public void Resolve ()
1042                 {
1043                         if (OptAttributes == null)
1044                                 return;
1045
1046                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
1047                         if (!OptAttributes.CheckTargets())
1048                                 return;
1049
1050                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1051                         if (ClsCompliantAttribute != null) {
1052                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1053                         }
1054
1055 #if GMCS_SOURCE
1056                         Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
1057                         if (a != null) {
1058                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1059                                 if (val != null)
1060                                         wrap_non_exception_throws = (bool)val;
1061                         }
1062 #endif
1063                 }
1064
1065                 // fix bug #56621
1066                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1067                 {
1068                         try {
1069                                 // check for possible ECMA key
1070                                 if (strongNameBlob.Length == 16) {
1071                                         // will be rejected if not "the" ECMA key
1072                                         an.SetPublicKey (strongNameBlob);
1073                                 }
1074                                 else {
1075                                         // take it, with or without, a private key
1076                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1077                                         // and make sure we only feed the public part to Sys.Ref
1078                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1079
1080                                         // AssemblyName.SetPublicKey requires an additional header
1081                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1082
1083                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1084                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1085                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1086                                         an.SetPublicKey (encodedPublicKey);
1087                                 }
1088                         }
1089                         catch (Exception) {
1090                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1091                                 Environment.Exit (1);
1092                         }
1093                 }
1094
1095                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1096                 public AssemblyName GetAssemblyName (string name, string output)
1097                 {
1098                         if (OptAttributes != null) {
1099                                 foreach (Attribute a in OptAttributes.Attrs) {
1100                                         // cannot rely on any resolve-based members before you call Resolve
1101                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1102                                                 continue;
1103
1104                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1105                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1106                                         //       are loaded yet.
1107                                         // TODO: Does not handle quoted attributes properly
1108                                         switch (a.Name) {
1109                                                 case "AssemblyKeyFile":
1110                                                 case "AssemblyKeyFileAttribute":
1111                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1112                                                         if (RootContext.StrongNameKeyFile != null) {
1113                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1114                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1115                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1116                                                         }
1117                                                         else {
1118                                                                 string value = a.GetString ();
1119                                                                 if (value.Length != 0)
1120                                                                         RootContext.StrongNameKeyFile = value;
1121                                                         }
1122                                                         break;
1123                                                 case "AssemblyKeyName":
1124                                                 case "AssemblyKeyNameAttribute":
1125                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1126                                                         if (RootContext.StrongNameKeyContainer != null) {
1127                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1128                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1129                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1130                                                         }
1131                                                         else {
1132                                                                 string value = a.GetString ();
1133                                                                 if (value.Length != 0)
1134                                                                         RootContext.StrongNameKeyContainer = value;
1135                                                         }
1136                                                         break;
1137                                                 case "AssemblyDelaySign":
1138                                                 case "AssemblyDelaySignAttribute":
1139                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1140                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1141                                                         break;
1142                                         }
1143                                 }
1144                         }
1145
1146                         AssemblyName an = new AssemblyName ();
1147                         an.Name = Path.GetFileNameWithoutExtension (name);
1148
1149                         // note: delay doesn't apply when using a key container
1150                         if (RootContext.StrongNameKeyContainer != null) {
1151                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1152                                 return an;
1153                         }
1154
1155                         // strongname is optional
1156                         if (RootContext.StrongNameKeyFile == null)
1157                                 return an;
1158
1159                         string AssemblyDir = Path.GetDirectoryName (output);
1160
1161                         // the StrongName key file may be relative to (a) the compiled
1162                         // file or (b) to the output assembly. See bugzilla #55320
1163                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1164
1165                         // (a) relative to the compiled file
1166                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1167                         bool exist = File.Exists (filename);
1168                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1169                                 // (b) relative to the outputed assembly
1170                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1171                                 exist = File.Exists (filename);
1172                         }
1173
1174                         if (exist) {
1175                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1176                                         byte[] snkeypair = new byte [fs.Length];
1177                                         fs.Read (snkeypair, 0, snkeypair.Length);
1178
1179                                         if (RootContext.StrongNameDelaySign) {
1180                                                 // delayed signing - DO NOT include private key
1181                                                 SetPublicKey (an, snkeypair);
1182                                         }
1183                                         else {
1184                                                 // no delay so we make sure we have the private key
1185                                                 try {
1186                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1187                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1188                                                 }
1189                                                 catch (CryptographicException) {
1190                                                         if (snkeypair.Length == 16) {
1191                                                                 // error # is different for ECMA key
1192                                                                 Report.Error (1606, "Could not sign the assembly. " +
1193                                                                         "ECMA key can only be used to delay-sign assemblies");
1194                                                         }
1195                                                         else {
1196                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1197                                                         }
1198                                                         return null;
1199                                                 }
1200                                         }
1201                                 }
1202                         }
1203                         else {
1204                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1205                                 return null;
1206                         }
1207                         return an;
1208                 }
1209
1210                 void Error_AssemblySigning (string text)
1211                 {
1212                         Report.Error (1548, "Error during assembly signing. " + text);
1213                 }
1214
1215 #if GMCS_SOURCE
1216                 bool CheckInternalsVisibleAttribute (Attribute a)
1217                 {
1218                         string assembly_name = a.GetString ();
1219                         if (assembly_name.Length == 0)
1220                                 return false;
1221
1222                         AssemblyName aname = null;
1223                         try {
1224                                 aname = new AssemblyName (assembly_name);
1225                         } catch (FileLoadException) {
1226                         } catch (ArgumentException) {
1227                         }
1228
1229                         // Bad assembly name format
1230                         if (aname == null)
1231                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1232                         // Report error if we have defined Version or Culture
1233                         else if (aname.Version != null || aname.CultureInfo != null)
1234                                 throw new Exception ("Friend assembly `" + a.GetString () +
1235                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1236                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null) {
1237                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1238                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1239                                 return false;
1240                         }
1241
1242                         return true;
1243                 }
1244 #endif
1245
1246                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1247                 {
1248                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1249                                 if (declarative_security == null)
1250                                         declarative_security = new ListDictionary ();
1251
1252                                 a.ExtractSecurityPermissionSet (declarative_security);
1253                                 return;
1254                         }
1255
1256                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1257                                 string value = a.GetString ();
1258                                 if (value == null || value.Length == 0)
1259                                         return;
1260
1261                                 if (RootContext.Target == Target.Exe) {
1262                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1263                                         return;
1264                                 }
1265                         }
1266
1267 #if GMCS_SOURCE
1268                         if (a.Type == TypeManager.internals_visible_attr_type && !CheckInternalsVisibleAttribute (a))
1269                                 return;
1270
1271                         if (a.Type == TypeManager.type_forwarder_attr_type) {
1272                                 Type t = a.GetArgumentType ();
1273                                 if (t == null || TypeManager.HasElementType (t)) {
1274                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1275                                         return;
1276                                 }
1277
1278                                 if (emitted_forwarders == null) {
1279                                         emitted_forwarders = new ListDictionary();
1280                                 } else if (emitted_forwarders.Contains(t)) {
1281                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
1282                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
1283                                                 TypeManager.CSharpName(t));
1284                                         return;
1285                                 }
1286
1287                                 emitted_forwarders.Add(t, a);
1288
1289                                 if (TypeManager.LookupDeclSpace (t) != null) {
1290                                         Report.SymbolRelatedToPreviousError (t);
1291                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1292                                                 TypeManager.CSharpName (t));
1293                                         return;
1294                                 }
1295
1296                                 if (t.IsNested) {
1297                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1298                                                 TypeManager.CSharpName (t));
1299                                         return;
1300                                 }
1301
1302                                 if (t.IsGenericType) {
1303                                         Report.Error (733, a.Location, "Cannot forward generic type `{0}'", TypeManager.CSharpName (t));
1304                                         return;
1305                                 }
1306
1307                                 if (add_type_forwarder == null) {
1308                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1309                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1310
1311                                         if (add_type_forwarder == null) {
1312                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1313                                                 return;
1314                                         }
1315                                 }
1316
1317                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1318                                 return;
1319                         }
1320
1321 #endif
1322                         Builder.SetCustomAttribute (customBuilder);
1323                 }
1324
1325                 public override void Emit (TypeContainer tc)
1326                 {
1327                         base.Emit (tc);
1328
1329 #if GMCS_SOURCE
1330                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1331                         if (OptAttributes == null || !OptAttributes.Contains (TypeManager.runtime_compatibility_attr_type)) {
1332                                 ConstructorInfo ci = TypeManager.GetConstructor (
1333                                         TypeManager.runtime_compatibility_attr_type, Type.EmptyTypes);
1334                                 PropertyInfo [] pis = new PropertyInfo [1];
1335                                 pis [0] = TypeManager.GetProperty (
1336                                         TypeManager.runtime_compatibility_attr_type, "WrapNonExceptionThrows");
1337                                 object [] pargs = new object [1];
1338                                 pargs [0] = true;
1339                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1340                         }
1341 #endif
1342
1343                         if (declarative_security != null) {
1344
1345                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1346                                 object builder_instance = Builder;
1347
1348                                 try {
1349                                         // Microsoft runtime hacking
1350                                         if (add_permission == null) {
1351                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1352                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1353
1354                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1355                                                 builder_instance = fi.GetValue (Builder);
1356                                         }
1357
1358                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1359                                                                                                   declarative_security [SecurityAction.RequestOptional],
1360                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1361                                         add_permission.Invoke (builder_instance, args);
1362                                 }
1363                                 catch {
1364                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1365                                 }
1366                         }
1367                 }
1368
1369                 public override string[] ValidAttributeTargets {
1370                         get {
1371                                 return attribute_targets;
1372                         }
1373                 }
1374
1375                 // Wrapper for AssemblyBuilder.AddModule
1376                 static MethodInfo adder_method;
1377                 static public MethodInfo AddModule_Method {
1378                         get {
1379                                 if (adder_method == null)
1380                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
1381                                 return adder_method;
1382                         }
1383                 }
1384                 public Module AddModule (string module)
1385                 {
1386                         MethodInfo m = AddModule_Method;
1387                         if (m == null) {
1388                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
1389                                 Environment.Exit (1);
1390                         }
1391
1392                         try {
1393                                 return (Module) m.Invoke (Builder, new object [] { module });
1394                         } catch (TargetInvocationException ex) {
1395                                 throw ex.InnerException;
1396                         }
1397                 }
1398         }
1399
1400         public class ModuleClass : CommonAssemblyModulClass {
1401                 // TODO: make it private and move all builder based methods here
1402                 public ModuleBuilder Builder;
1403                 bool m_module_is_unsafe;
1404
1405                 public CharSet DefaultCharSet = CharSet.Ansi;
1406                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1407
1408                 static string[] attribute_targets = new string [] { "module" };
1409
1410                 public ModuleClass (bool is_unsafe)
1411                 {
1412                         m_module_is_unsafe = is_unsafe;
1413                 }
1414
1415                 public override AttributeTargets AttributeTargets {
1416                         get {
1417                                 return AttributeTargets.Module;
1418                         }
1419                 }
1420
1421                 public override bool IsClsComplianceRequired ()
1422                 {
1423                         return CodeGen.Assembly.IsClsCompliant;
1424                 }
1425
1426                 public override void Emit (TypeContainer tc)
1427                 {
1428                         base.Emit (tc);
1429
1430                         if (!m_module_is_unsafe)
1431                                 return;
1432
1433                         if (TypeManager.unverifiable_code_ctor == null) {
1434                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1435                                 return;
1436                         }
1437
1438                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1439                 }
1440
1441                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1442                 {
1443                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1444                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1445                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1446                                 }
1447                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1448                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1449                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1450                                         return;
1451                                 }
1452                         }
1453
1454                         Builder.SetCustomAttribute (customBuilder);
1455                 }
1456
1457                 /// <summary>
1458                 /// It is called very early therefore can resolve only predefined attributes
1459                 /// </summary>
1460                 public void Resolve ()
1461                 {
1462 #if GMCS_SOURCE
1463                         if (OptAttributes == null)
1464                                 return;
1465
1466                         if (!OptAttributes.CheckTargets())
1467                                 return;
1468
1469                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1470                         if (a != null) {
1471                                 DefaultCharSet = a.GetCharSetValue ();
1472                                 switch (DefaultCharSet) {
1473                                         case CharSet.Ansi:
1474                                         case CharSet.None:
1475                                                 break;
1476                                         case CharSet.Auto:
1477                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1478                                                 break;
1479                                         case CharSet.Unicode:
1480                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1481                                                 break;
1482                                         default:
1483                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1484                                                 break;
1485                                 }
1486                         }
1487 #endif
1488                 }
1489
1490                 public override string[] ValidAttributeTargets {
1491                         get {
1492                                 return attribute_targets;
1493                         }
1494                 }
1495         }
1496 }