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