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                 public static EmitContext TempEc;
 387
 388                 bool isAnonymousMethodAllowed = true;
 389
 390                 Phase current_phase;
 391                 FlowBranching current_flow_branching;
 392
 393                 static int next_id = 0;
 394                 int id = ++next_id;
 395
 396                 public override string ToString ()
 397                 {
 398                         return String.Format ("EmitContext ({0}:{1})", id,
 399                                               CurrentAnonymousMethod, loc);
 400                 }
 401
 402                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 403                                     Type return_type, int code_flags, bool is_constructor)
 404                 {
 405                         this.ResolveContext = rc;
 406                         this.ig = ig;
 407
 408                         TypeContainer = parent;
 409                         this.declSpace = ds;
 410                         if (RootContext.Checked)
 411                                 flags |= Flags.CheckState;
 412                         flags |= Flags.ConstantCheckState;
 413
 414 #if GMCS_SOURCE
 415                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 416                                 throw new InternalErrorException ();
 417 #endif
 418
 419                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 420                         MethodIsStatic = IsStatic;
 421                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 422                         ReturnType = return_type;
 423                         IsConstructor = is_constructor;
 424                         CurrentBlock = null;
 425                         CurrentFile = 0;
 426                         current_phase = Phase.Created;
 427
 428                         if (parent != null){
 429                                 // Can only be null for the ResolveType contexts.
 430                                 ContainerType = parent.TypeBuilder;
 431                                 if (rc.IsInUnsafeScope)
 432                                         flags |= Flags.InUnsafe;
 433                         }
 434                         loc = l;
 435
 436                         if (ReturnType == TypeManager.void_type)
 437                                 ReturnType = null;
 438                 }
 439
 440                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 441                                     Type return_type, int code_flags, bool is_constructor)
 442                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 443                 {
 444                 }
 445
 446                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 447                                     Type return_type, int code_flags)
 448                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 449                 {
 450                 }
 451
 452                 public DeclSpace DeclContainer {
 453                         get { return declSpace; }
 454                         set { declSpace = value; }
 455                 }
 456
 457                 public DeclSpace GenericDeclContainer {
 458                         get { return DeclContainer; }
 459                 }
 460
 461                 public bool CheckState {
 462                         get { return (flags & Flags.CheckState) != 0; }
 463                 }
 464
 465                 public bool ConstantCheckState {
 466                         get { return (flags & Flags.ConstantCheckState) != 0; }
 467                 }
 468
 469                 public bool InUnsafe {
 470                         get { return (flags & Flags.InUnsafe) != 0; }
 471                 }
 472
 473                 public bool InCatch {
 474                         get { return (flags & Flags.InCatch) != 0; }
 475                 }
 476
 477                 public bool InFinally {
 478                         get { return (flags & Flags.InFinally) != 0; }
 479                 }
 480
 481                 public bool DoFlowAnalysis {
 482                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 483                 }
 484
 485                 public bool OmitStructFlowAnalysis {
 486                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 487                 }
 488
 489                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 490                 // it's public so that we can use a struct at the callsite
 491                 public struct FlagsHandle : IDisposable
 492                 {
 493                         EmitContext ec;
 494                         Flags invmask, oldval;
 495                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 496                         {
 497                                 this.ec = ec;
 498                                 invmask = ~mask;
 499                                 oldval = ec.flags & mask;
 500                                 ec.flags = (ec.flags & invmask) | (val & mask);
 501                         }
 502                         public void Dispose ()
 503                         {
 504                                 ec.flags = (ec.flags & invmask) | oldval;
 505                         }
 506                 }
 507
 508                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 509                 public FlagsHandle With (Flags bits, bool enable)
 510                 {
 511                         return new FlagsHandle (this, bits, enable ? bits : 0);
 512                 }
 513
 514                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 515                 {
 516                         Flags newflags =
 517                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 518                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 519                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 520                 }
 521
 522                 public bool IsInObsoleteScope {
 523                         get { return ResolveContext.IsInObsoleteScope; }
 524                 }
 525
 526                 public bool IsInUnsafeScope {
 527                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 528                 }
 529
 530                 public bool IsAnonymousMethodAllowed {
 531                         get { return isAnonymousMethodAllowed; }
 532                         set { isAnonymousMethodAllowed = value; }
 533                 }
 534
 535                 public FlowBranching CurrentBranching {
 536                         get { return current_flow_branching; }
 537                 }
 538
 539                 // <summary>
 540                 //   Starts a new code branching.  This inherits the state of all local
 541                 //   variables and parameters from the current branching.
 542                 // </summary>
 543                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 544                 {
 545                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 546                         return current_flow_branching;
 547                 }
 548
 549                 // <summary>
 550                 //   Starts a new code branching for block `block'.
 551                 // </summary>
 552                 public FlowBranching StartFlowBranching (Block block)
 553                 {
 554                         FlowBranching.BranchingType type;
 555
 556                         if ((CurrentBranching != null) &&
 557                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 558                                 type = FlowBranching.BranchingType.SwitchSection;
 559                         else
 560                                 type = FlowBranching.BranchingType.Block;
 561
 562                         flags |= Flags.DoFlowAnalysis;
 563
 564                         current_flow_branching = FlowBranching.CreateBranching (
 565                                 CurrentBranching, type, block, block.StartLocation);
 566                         return current_flow_branching;
 567                 }
 568
 569                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 570                 {
 571                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 572                         current_flow_branching = branching;
 573                         return branching;
 574                 }
 575
 576                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 577                 {
 578                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 579                         current_flow_branching = branching;
 580                         return branching;
 581                 }
 582
 583                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 584                 {
 585                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 586                         current_flow_branching = branching;
 587                         return branching;
 588                 }
 589
 590                 // <summary>
 591                 //   Ends a code branching.  Merges the state of locals and parameters
 592                 //   from all the children of the ending branching.
 593                 // </summary>
 594                 public FlowBranching.UsageVector DoEndFlowBranching ()
 595                 {
 596                         FlowBranching old = current_flow_branching;
 597                         current_flow_branching = current_flow_branching.Parent;
 598
 599                         return current_flow_branching.MergeChild (old);
 600                 }
 601
 602                 // <summary>
 603                 //   Ends a code branching.  Merges the state of locals and parameters
 604                 //   from all the children of the ending branching.
 605                 // </summary>
 606                 public FlowBranching.Reachability EndFlowBranching ()
 607                 {
 608                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 609
 610                         return vector.Reachability;
 611                 }
 612
 613                 // <summary>
 614                 //   Kills the current code branching.  This throws away any changed state
 615                 //   information and should only be used in case of an error.
 616                 // </summary>
 617                 public void KillFlowBranching ()
 618                 {
 619                         current_flow_branching = current_flow_branching.Parent;
 620                 }
 621
 622                 public bool MustCaptureVariable (LocalInfo local)
 623                 {
 624                         if (CurrentAnonymousMethod == null)
 625                                 return false;
 626                         if (CurrentAnonymousMethod.IsIterator)
 627                                 return true;
 628                         return local.Block.Toplevel != CurrentBlock.Toplevel;
 629                 }
 630
 631                 public void EmitMeta (ToplevelBlock b)
 632                 {
 633                         b.EmitMeta (this);
 634
 635                         if (HasReturnLabel)
 636                                 ReturnLabel = ig.DefineLabel ();
 637                 }
 638
 639                 //
 640                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 641                 // currently can not cope with ig == null during resolve (which must
 642                 // be fixed for switch statements to work on anonymous methods).
 643                 //
 644                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 645                 {
 646                         if (block == null)
 647                                 return;
 648
 649                         bool unreachable;
 650
 651                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 652                                 EmitMeta (block);
 653
 654                                 current_phase = Phase.Emitting;
 655                                 EmitResolvedTopBlock (block, unreachable);
 656                         }
 657                 }
 658
 659                 bool resolved;
 660
 661                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 662                                              Parameters ip, IMethodData md, out bool unreachable)
 663                 {
 664                         current_phase = Phase.Resolving;
 665
 666                         unreachable = false;
 667
 668                         if (resolved)
 669                                 return true;
 670
 671                         if (!loc.IsNull)
 672                                 CurrentFile = loc.File;
 673
 674 #if PRODUCTION
 675                         try {
 676 #endif
 677                                 if (!block.ResolveMeta (this, ip))
 678                                         return false;
 679
 680                                 if ((md != null) && (md.Iterator != null)) {
 681                                         if (!md.Iterator.Resolve (this))
 682                                                 return false;
 683                                 }
 684
 685                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 686                                         FlowBranchingToplevel top_level;
 687                                         if (anonymous_method_host != null)
 688                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 689                                         else
 690                                                 top_level = block.TopLevelBranching;
 691
 692                                         current_flow_branching = top_level;
 693                                         bool ok = block.Resolve (this);
 694                                         current_flow_branching = null;
 695
 696                                         if (!ok)
 697                                                 return false;
 698
 699                                         FlowBranching.Reachability reachability = top_level.End ();
 700                                         if (reachability.IsUnreachable)
 701                                                 unreachable = true;
 702                                 }
 703 #if PRODUCTION
 704                         } catch (Exception e) {
 705                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 706                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 707
 708                                 if (CurrentBlock != null){
 709                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 710                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 711                                 }
 712                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 713                                 throw;
 714                         }
 715 #endif
 716
 717                         if (ReturnType != null && !unreachable) {
 718                                 if (CurrentAnonymousMethod == null) {
 719                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 720                                         return false;
 721                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 722                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 723                                                       CurrentAnonymousMethod.GetSignatureForError ());
 724                                         return false;
 725                                 }
 726                         }
 727
 728                         if (!block.CompleteContexts (this))
 729                                 return false;
 730
 731                         resolved = true;
 732                         return true;
 733                 }
 734
 735                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 736                 {
 737                         if (block != null)
 738                                 block.Emit (this);
 739
 740                         if (HasReturnLabel)
 741                                 ig.MarkLabel (ReturnLabel);
 742
 743                         if (return_value != null){
 744                                 ig.Emit (OpCodes.Ldloc, return_value);
 745                                 ig.Emit (OpCodes.Ret);
 746                         } else {
 747                                 //
 748                                 // If `HasReturnLabel' is set, then we already emitted a
 749                                 // jump to the end of the method, so we must emit a `ret'
 750                                 // there.
 751                                 //
 752                                 // Unfortunately, System.Reflection.Emit automatically emits
 753                                 // a leave to the end of a finally block.  This is a problem
 754                                 // if no code is following the try/finally block since we may
 755                                 // jump to a point after the end of the method.
 756                                 // As a workaround, we're always creating a return label in
 757                                 // this case.
 758                                 //
 759
 760                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 761                                         CurrentAnonymousMethod.IsIterator && InIterator;
 762
 763                                 if ((block != null) && block.IsDestructor) {
 764                                         // Nothing to do; S.R.E automatically emits a leave.
 765                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 766                                         if (ReturnType != null)
 767                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 768                                         ig.Emit (OpCodes.Ret);
 769                                 }
 770                         }
 771                 }
 772
 773                 /// <summary>
 774                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 775                 ///   writer to which source line this opcode belongs.
 776                 /// </summary>
 777                 public void Mark (Location loc, bool check_file)
 778                 {
 779                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 780                                 return;
 781
 782                         if (check_file && (CurrentFile != loc.File))
 783                                 return;
 784
 785                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 786                 }
 787
 788                 public void DefineLocalVariable (string name, LocalBuilder builder)
 789                 {
 790                         if (CodeGen.SymbolWriter == null)
 791                                 return;
 792
 793                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 794                 }
 795
 796                 public void BeginScope ()
 797                 {
 798                         ig.BeginScope();
 799
 800                         if (CodeGen.SymbolWriter != null)
 801                                 CodeGen.SymbolWriter.OpenScope(ig);
 802                 }
 803
 804                 public void EndScope ()
 805                 {
 806                         ig.EndScope();
 807
 808                         if (CodeGen.SymbolWriter != null)
 809                                 CodeGen.SymbolWriter.CloseScope(ig);
 810                 }
 811
 812                 /// <summary>
 813                 ///   Returns a temporary storage for a variable of type t as
 814                 ///   a local variable in the current body.
 815                 /// </summary>
 816                 public LocalBuilder GetTemporaryLocal (Type t)
 817                 {
 818                         if (temporary_storage != null) {
 819                                 object o = temporary_storage [t];
 820                                 if (o != null) {
 821                                         if (o is Stack) {
 822                                                 Stack s = (Stack) o;
 823                                                 o = s.Count == 0 ? null : s.Pop ();
 824                                         } else {
 825                                                 temporary_storage.Remove (t);
 826                                         }
 827                                 }
 828                                 if (o != null)
 829                                         return (LocalBuilder) o;
 830                         }
 831                         return ig.DeclareLocal (t);
 832                 }
 833
 834                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 835                 {
 836                         Stack s;
 837
 838                         if (temporary_storage == null) {
 839                                 temporary_storage = new Hashtable ();
 840                                 temporary_storage [t] = b;
 841                                 return;
 842                         }
 843                         object o = temporary_storage [t];
 844                         if (o == null) {
 845                                 temporary_storage [t] = b;
 846                                 return;
 847                         }
 848                         if (o is Stack) {
 849                                 s = (Stack) o;
 850                         } else {
 851                                 s = new Stack ();
 852                                 s.Push (o);
 853                                 temporary_storage [t] = s;
 854                         }
 855                         s.Push (b);
 856                 }
 857
 858                 /// <summary>
 859                 ///   Current loop begin and end labels.
 860                 /// </summary>
 861                 public Label LoopBegin, LoopEnd;
 862
 863                 /// <summary>
 864                 ///   Default target in a switch statement.   Only valid if
 865                 ///   InSwitch is true
 866                 /// </summary>
 867                 public Label DefaultTarget;
 868
 869                 /// <summary>
 870                 ///   If this is non-null, points to the current switch statement
 871                 /// </summary>
 872                 public Switch Switch;
 873
 874                 /// <summary>
 875                 ///   ReturnValue creates on demand the LocalBuilder for the
 876                 ///   return value from the function.  By default this is not
 877                 ///   used.  This is only required when returns are found inside
 878                 ///   Try or Catch statements.
 879                 ///
 880                 ///   This method is typically invoked from the Emit phase, so
 881                 ///   we allow the creation of a return label if it was not
 882                 ///   requested during the resolution phase.   Could be cleaned
 883                 ///   up, but it would replicate a lot of logic in the Emit phase
 884                 ///   of the code that uses it.
 885                 /// </summary>
 886                 public LocalBuilder TemporaryReturn ()
 887                 {
 888                         if (return_value == null){
 889                                 return_value = ig.DeclareLocal (ReturnType);
 890                                 if (!HasReturnLabel){
 891                                         ReturnLabel = ig.DefineLabel ();
 892                                         HasReturnLabel = true;
 893                                 }
 894                         }
 895
 896                         return return_value;
 897                 }
 898
 899                 /// <summary>
 900                 ///   This method is used during the Resolution phase to flag the
 901                 ///   need to define the ReturnLabel
 902                 /// </summary>
 903                 public void NeedReturnLabel ()
 904                 {
 905                         if (current_phase != Phase.Resolving){
 906                                 //
 907                                 // The reason is that the `ReturnLabel' is declared between
 908                                 // resolution and emission
 909                                 //
 910                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 911                         }
 912
 913                         if (!InIterator && !HasReturnLabel)
 914                                 HasReturnLabel = true;
 915                 }
 916
 917
 918                 public Expression GetThis (Location loc)
 919                 {
 920                         This my_this;
 921                         if (CurrentBlock != null)
 922                                 my_this = new This (CurrentBlock, loc);
 923                         else
 924                                 my_this = new This (loc);
 925
 926                         if (!my_this.ResolveBase (this))
 927                                 my_this = null;
 928
 929                         return my_this;
 930                 }
 931         }
 932
 933
 934         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
 935
 936                 protected CommonAssemblyModulClass ():
 937                         base (null)
 938                 {
 939                 }
 940
 941                 public void AddAttributes (ArrayList attrs)
 942                 {
 943                         foreach (Attribute a in attrs)
 944                                 a.AttachTo (this);
 945
 946                         if (attributes == null) {
 947                                 attributes = new Attributes (attrs);
 948                                 return;
 949                         }
 950                         attributes.AddAttributes (attrs);
 951                 }
 952
 953                 public virtual void Emit (TypeContainer tc)
 954                 {
 955                         if (OptAttributes == null)
 956                                 return;
 957
 958                         OptAttributes.Emit ();
 959                 }
 960
 961                 protected Attribute ResolveAttribute (Type a_type)
 962                 {
 963                         Attribute a = OptAttributes.Search (a_type);
 964                         if (a != null) {
 965                                 a.Resolve ();
 966                         }
 967                         return a;
 968                 }
 969
 970                 public override IResolveContext ResolveContext {
 971                         get { return this; }
 972                 }
 973
 974                 #region IResolveContext Members
 975
 976                 public DeclSpace DeclContainer {
 977                         get { return RootContext.ToplevelTypes; }
 978                 }
 979
 980                 public DeclSpace GenericDeclContainer {
 981                         get { return DeclContainer; }
 982                 }
 983
 984                 public bool IsInObsoleteScope {
 985                         get { return false; }
 986                 }
 987
 988                 public bool IsInUnsafeScope {
 989                         get { return false; }
 990                 }
 991
 992                 #endregion
 993         }
 994
 995         public class AssemblyClass : CommonAssemblyModulClass {
 996                 // TODO: make it private and move all builder based methods here
 997                 public AssemblyBuilder Builder;
 998                 bool is_cls_compliant;
 999                 bool wrap_non_exception_throws;
1000                 bool has_extension_method;
1001
1002                 public Attribute ClsCompliantAttribute;
1003
1004                 ListDictionary declarative_security;
1005 #if GMCS_SOURCE
1006                 public AssemblyName Name;
1007                 MethodInfo add_type_forwarder;
1008                 ListDictionary emitted_forwarders;
1009 #endif
1010
1011                 // Module is here just because of error messages
1012                 static string[] attribute_targets = new string [] { "assembly", "module" };
1013
1014                 public AssemblyClass (): base ()
1015                 {
1016 #if GMCS_SOURCE
1017                         wrap_non_exception_throws = true;
1018 #endif
1019                 }
1020
1021                 public bool HasExtensionMethods {
1022                         set { has_extension_method = value; }
1023                 }
1024
1025                 public bool IsClsCompliant {
1026                         get {
1027                                 return is_cls_compliant;
1028                         }
1029                 }
1030
1031                 public bool WrapNonExceptionThrows {
1032                         get {
1033                                 return wrap_non_exception_throws;
1034                         }
1035                 }
1036
1037                 public override AttributeTargets AttributeTargets {
1038                         get {
1039                                 return AttributeTargets.Assembly;
1040                         }
1041                 }
1042
1043                 public override bool IsClsComplianceRequired ()
1044                 {
1045                         return is_cls_compliant;
1046                 }
1047
1048                 public void Resolve ()
1049                 {
1050                         if (OptAttributes == null)
1051                                 return;
1052
1053                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
1054                         if (!OptAttributes.CheckTargets())
1055                                 return;
1056
1057                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1058                         if (ClsCompliantAttribute != null) {
1059                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1060                         }
1061
1062 #if GMCS_SOURCE
1063                         Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
1064                         if (a != null) {
1065                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1066                                 if (val != null)
1067                                         wrap_non_exception_throws = (bool)val;
1068                         }
1069 #endif
1070                 }
1071
1072                 // fix bug #56621
1073                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1074                 {
1075                         try {
1076                                 // check for possible ECMA key
1077                                 if (strongNameBlob.Length == 16) {
1078                                         // will be rejected if not "the" ECMA key
1079                                         an.SetPublicKey (strongNameBlob);
1080                                 }
1081                                 else {
1082                                         // take it, with or without, a private key
1083                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1084                                         // and make sure we only feed the public part to Sys.Ref
1085                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1086
1087                                         // AssemblyName.SetPublicKey requires an additional header
1088                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1089
1090                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1091                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1092                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1093                                         an.SetPublicKey (encodedPublicKey);
1094                                 }
1095                         }
1096                         catch (Exception) {
1097                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1098                                 Environment.Exit (1);
1099                         }
1100                 }
1101
1102                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1103                 public AssemblyName GetAssemblyName (string name, string output)
1104                 {
1105                         if (OptAttributes != null) {
1106                                 foreach (Attribute a in OptAttributes.Attrs) {
1107                                         // cannot rely on any resolve-based members before you call Resolve
1108                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1109                                                 continue;
1110
1111                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1112                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1113                                         //       are loaded yet.
1114                                         // TODO: Does not handle quoted attributes properly
1115                                         switch (a.Name) {
1116                                                 case "AssemblyKeyFile":
1117                                                 case "AssemblyKeyFileAttribute":
1118                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1119                                                         if (RootContext.StrongNameKeyFile != null) {
1120                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1121                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1122                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1123                                                         }
1124                                                         else {
1125                                                                 string value = a.GetString ();
1126                                                                 if (value.Length != 0)
1127                                                                         RootContext.StrongNameKeyFile = value;
1128                                                         }
1129                                                         break;
1130                                                 case "AssemblyKeyName":
1131                                                 case "AssemblyKeyNameAttribute":
1132                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1133                                                         if (RootContext.StrongNameKeyContainer != null) {
1134                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1135                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1136                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1137                                                         }
1138                                                         else {
1139                                                                 string value = a.GetString ();
1140                                                                 if (value.Length != 0)
1141                                                                         RootContext.StrongNameKeyContainer = value;
1142                                                         }
1143                                                         break;
1144                                                 case "AssemblyDelaySign":
1145                                                 case "AssemblyDelaySignAttribute":
1146                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1147                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1148                                                         break;
1149                                         }
1150                                 }
1151                         }
1152
1153                         AssemblyName an = new AssemblyName ();
1154                         an.Name = Path.GetFileNameWithoutExtension (name);
1155
1156                         // note: delay doesn't apply when using a key container
1157                         if (RootContext.StrongNameKeyContainer != null) {
1158                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1159                                 return an;
1160                         }
1161
1162                         // strongname is optional
1163                         if (RootContext.StrongNameKeyFile == null)
1164                                 return an;
1165
1166                         string AssemblyDir = Path.GetDirectoryName (output);
1167
1168                         // the StrongName key file may be relative to (a) the compiled
1169                         // file or (b) to the output assembly. See bugzilla #55320
1170                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1171
1172                         // (a) relative to the compiled file
1173                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1174                         bool exist = File.Exists (filename);
1175                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1176                                 // (b) relative to the outputed assembly
1177                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1178                                 exist = File.Exists (filename);
1179                         }
1180
1181                         if (exist) {
1182                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1183                                         byte[] snkeypair = new byte [fs.Length];
1184                                         fs.Read (snkeypair, 0, snkeypair.Length);
1185
1186                                         if (RootContext.StrongNameDelaySign) {
1187                                                 // delayed signing - DO NOT include private key
1188                                                 SetPublicKey (an, snkeypair);
1189                                         }
1190                                         else {
1191                                                 // no delay so we make sure we have the private key
1192                                                 try {
1193                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1194                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1195                                                 }
1196                                                 catch (CryptographicException) {
1197                                                         if (snkeypair.Length == 16) {
1198                                                                 // error # is different for ECMA key
1199                                                                 Report.Error (1606, "Could not sign the assembly. " +
1200                                                                         "ECMA key can only be used to delay-sign assemblies");
1201                                                         }
1202                                                         else {
1203                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1204                                                         }
1205                                                         return null;
1206                                                 }
1207                                         }
1208                                 }
1209                         }
1210                         else {
1211                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1212                                 return null;
1213                         }
1214                         return an;
1215                 }
1216
1217                 void Error_AssemblySigning (string text)
1218                 {
1219                         Report.Error (1548, "Error during assembly signing. " + text);
1220                 }
1221
1222 #if GMCS_SOURCE
1223                 bool CheckInternalsVisibleAttribute (Attribute a)
1224                 {
1225                         string assembly_name = a.GetString ();
1226                         if (assembly_name.Length == 0)
1227                                 return false;
1228
1229                         AssemblyName aname = null;
1230                         try {
1231                                 aname = new AssemblyName (assembly_name);
1232                         } catch (FileLoadException) {
1233                         } catch (ArgumentException) {
1234                         }
1235
1236                         // Bad assembly name format
1237                         if (aname == null)
1238                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1239                         // Report error if we have defined Version or Culture
1240                         else if (aname.Version != null || aname.CultureInfo != null)
1241                                 throw new Exception ("Friend assembly `" + a.GetString () +
1242                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1243                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null) {
1244                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1245                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1246                                 return false;
1247                         }
1248
1249                         return true;
1250                 }
1251 #endif
1252
1253                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1254                 {
1255                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1256                                 if (declarative_security == null)
1257                                         declarative_security = new ListDictionary ();
1258
1259                                 a.ExtractSecurityPermissionSet (declarative_security);
1260                                 return;
1261                         }
1262
1263                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1264                                 string value = a.GetString ();
1265                                 if (value == null || value.Length == 0)
1266                                         return;
1267
1268                                 if (RootContext.Target == Target.Exe) {
1269                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1270                                         return;
1271                                 }
1272                         }
1273
1274 #if GMCS_SOURCE
1275                         if (a.Type == TypeManager.internals_visible_attr_type && !CheckInternalsVisibleAttribute (a))
1276                                 return;
1277
1278                         if (a.Type == TypeManager.type_forwarder_attr_type) {
1279                                 Type t = a.GetArgumentType ();
1280                                 if (t == null || TypeManager.HasElementType (t)) {
1281                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1282                                         return;
1283                                 }
1284
1285                                 if (emitted_forwarders == null) {
1286                                         emitted_forwarders = new ListDictionary();
1287                                 } else if (emitted_forwarders.Contains(t)) {
1288                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
1289                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
1290                                                 TypeManager.CSharpName(t));
1291                                         return;
1292                                 }
1293
1294                                 emitted_forwarders.Add(t, a);
1295
1296                                 if (TypeManager.LookupDeclSpace (t) != null) {
1297                                         Report.SymbolRelatedToPreviousError (t);
1298                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1299                                                 TypeManager.CSharpName (t));
1300                                         return;
1301                                 }
1302
1303                                 if (t.IsNested) {
1304                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1305                                                 TypeManager.CSharpName (t));
1306                                         return;
1307                                 }
1308
1309                                 if (t.IsGenericType) {
1310                                         Report.Error (733, a.Location, "Cannot forward generic type `{0}'", TypeManager.CSharpName (t));
1311                                         return;
1312                                 }
1313
1314                                 if (add_type_forwarder == null) {
1315                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1316                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1317
1318                                         if (add_type_forwarder == null) {
1319                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1320                                                 return;
1321                                         }
1322                                 }
1323
1324                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1325                                 return;
1326                         }
1327
1328                         if (a.Type == TypeManager.extension_attribute_type) {
1329                                 a.Error_MisusedExtensionAttribute ();
1330                                 return;
1331                         }
1332 #endif
1333                         Builder.SetCustomAttribute (customBuilder);
1334                 }
1335
1336                 public override void Emit (TypeContainer tc)
1337                 {
1338                         base.Emit (tc);
1339
1340 #if GMCS_SOURCE
1341                         if (has_extension_method)
1342                                 Builder.SetCustomAttribute (TypeManager.extension_attribute_attr);
1343
1344                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1345                         if (OptAttributes == null || !OptAttributes.Contains (TypeManager.runtime_compatibility_attr_type)) {
1346                                 ConstructorInfo ci = TypeManager.GetConstructor (
1347                                         TypeManager.runtime_compatibility_attr_type, Type.EmptyTypes);
1348                                 PropertyInfo [] pis = new PropertyInfo [1];
1349                                 pis [0] = TypeManager.GetProperty (
1350                                         TypeManager.runtime_compatibility_attr_type, "WrapNonExceptionThrows");
1351                                 object [] pargs = new object [1];
1352                                 pargs [0] = true;
1353                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1354                         }
1355 #endif
1356
1357                         if (declarative_security != null) {
1358
1359                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1360                                 object builder_instance = Builder;
1361
1362                                 try {
1363                                         // Microsoft runtime hacking
1364                                         if (add_permission == null) {
1365                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1366                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1367
1368                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1369                                                 builder_instance = fi.GetValue (Builder);
1370                                         }
1371
1372                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1373                                                                                                   declarative_security [SecurityAction.RequestOptional],
1374                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1375                                         add_permission.Invoke (builder_instance, args);
1376                                 }
1377                                 catch {
1378                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1379                                 }
1380                         }
1381                 }
1382
1383                 public override string[] ValidAttributeTargets {
1384                         get {
1385                                 return attribute_targets;
1386                         }
1387                 }
1388
1389                 // Wrapper for AssemblyBuilder.AddModule
1390                 static MethodInfo adder_method;
1391                 static public MethodInfo AddModule_Method {
1392                         get {
1393                                 if (adder_method == null)
1394                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
1395                                 return adder_method;
1396                         }
1397                 }
1398                 public Module AddModule (string module)
1399                 {
1400                         MethodInfo m = AddModule_Method;
1401                         if (m == null) {
1402                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
1403                                 Environment.Exit (1);
1404                         }
1405
1406                         try {
1407                                 return (Module) m.Invoke (Builder, new object [] { module });
1408                         } catch (TargetInvocationException ex) {
1409                                 throw ex.InnerException;
1410                         }
1411                 }
1412         }
1413
1414         public class ModuleClass : CommonAssemblyModulClass {
1415                 // TODO: make it private and move all builder based methods here
1416                 public ModuleBuilder Builder;
1417                 bool m_module_is_unsafe;
1418                 bool has_default_charset;
1419
1420                 public CharSet DefaultCharSet = CharSet.Ansi;
1421                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1422
1423                 static string[] attribute_targets = new string [] { "module" };
1424
1425                 public ModuleClass (bool is_unsafe)
1426                 {
1427                         m_module_is_unsafe = is_unsafe;
1428                 }
1429
1430                 public override AttributeTargets AttributeTargets {
1431                         get {
1432                                 return AttributeTargets.Module;
1433                         }
1434                 }
1435
1436                 public override bool IsClsComplianceRequired ()
1437                 {
1438                         return CodeGen.Assembly.IsClsCompliant;
1439                 }
1440
1441                 public override void Emit (TypeContainer tc)
1442                 {
1443                         base.Emit (tc);
1444
1445                         if (!m_module_is_unsafe)
1446                                 return;
1447
1448                         if (TypeManager.unverifiable_code_ctor == null) {
1449                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1450                                 return;
1451                         }
1452
1453                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1454                 }
1455
1456                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1457                 {
1458                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1459                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1460                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1461                                 }
1462                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1463                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1464                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1465                                         return;
1466                                 }
1467                         }
1468
1469                         Builder.SetCustomAttribute (customBuilder);
1470                 }
1471
1472                 public bool HasDefaultCharSet {
1473                         get {
1474                                 return has_default_charset;
1475                         }
1476                 }
1477
1478                 /// <summary>
1479                 /// It is called very early therefore can resolve only predefined attributes
1480                 /// </summary>
1481                 public void Resolve ()
1482                 {
1483 #if GMCS_SOURCE
1484                         if (OptAttributes == null)
1485                                 return;
1486
1487                         if (!OptAttributes.CheckTargets())
1488                                 return;
1489
1490                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1491                         if (a != null) {
1492                                 has_default_charset = true;
1493                                 DefaultCharSet = a.GetCharSetValue ();
1494                                 switch (DefaultCharSet) {
1495                                         case CharSet.Ansi:
1496                                         case CharSet.None:
1497                                                 break;
1498                                         case CharSet.Auto:
1499                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1500                                                 break;
1501                                         case CharSet.Unicode:
1502                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1503                                                 break;
1504                                         default:
1505                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1506                                                 break;
1507                                 }
1508                         }
1509 #endif
1510                 }
1511
1512                 public override string[] ValidAttributeTargets {
1513                         get {
1514                                 return attribute_targets;
1515                         }
1516                 }
1517         }
1518 }