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 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                 /// <summary>
 364                 ///   Anonymous methods can capture local variables and fields,
 365                 ///   this object tracks it.  It is copied from the TopLevelBlock
 366                 ///   field.
 367                 /// </summary>
 368                 public CaptureContext capture_context;
 369
 370                 public readonly IResolveContext ResolveContext;
 371
 372                 /// <summary>
 373                 ///    The current iterator
 374                 /// </summary>
 375 #if GMCS_SOURCE
 376                 public Iterator CurrentIterator {
 377                         get {
 378                                 if (CurrentAnonymousMethod != null)
 379                                         return CurrentAnonymousMethod.Iterator;
 380                                 else
 381                                         return null;
 382                         }
 383                 }
 384 #else
 385                 public Iterator CurrentIterator;
 386 #endif
 387
 388                 /// <summary>
 389                 ///    Whether we are in the resolving stage or not
 390                 /// </summary>
 391                 enum Phase {
 392                         Created,
 393                         Resolving,
 394                         Emitting
 395                 }
 396
 397                 bool isAnonymousMethodAllowed = true;
 398
 399                 Phase current_phase;
 400                 FlowBranching current_flow_branching;
 401
 402                 static int next_id = 0;
 403                 int id = ++next_id;
 404
 405                 public override string ToString ()
 406                 {
 407                         return String.Format ("EmitContext ({0}:{1}:{2})", id,
 408                                               CurrentIterator, capture_context, loc);
 409                 }
 410
 411                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 412                                     Type return_type, int code_flags, bool is_constructor)
 413                 {
 414                         this.ResolveContext = rc;
 415                         this.ig = ig;
 416
 417                         TypeContainer = parent;
 418                         this.declSpace = ds;
 419                         if (RootContext.Checked)
 420                                 flags |= Flags.CheckState;
 421                         flags |= Flags.ConstantCheckState;
 422
 423 #if GMCS_SOURCE
 424                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 425                                 throw new InternalErrorException ();
 426 #endif
 427
 428                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 429                         MethodIsStatic = IsStatic;
 430                         InIterator = (code_flags & Modifiers.METHOD_YIELDS) != 0;
 431                         ReturnType = return_type;
 432                         IsConstructor = is_constructor;
 433                         CurrentBlock = null;
 434                         CurrentFile = 0;
 435                         current_phase = Phase.Created;
 436
 437                         if (parent != null){
 438                                 // Can only be null for the ResolveType contexts.
 439                                 ContainerType = parent.TypeBuilder;
 440                                 if (rc.IsInUnsafeScope)
 441                                         flags |= Flags.InUnsafe;
 442                         }
 443                         loc = l;
 444
 445                         if (ReturnType == TypeManager.void_type)
 446                                 ReturnType = null;
 447                 }
 448
 449                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 450                                     Type return_type, int code_flags, bool is_constructor)
 451                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 452                 {
 453                 }
 454
 455                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 456                                     Type return_type, int code_flags)
 457                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 458                 {
 459                 }
 460
 461                 public DeclSpace DeclContainer {
 462                         get { return declSpace; }
 463                         set { declSpace = value; }
 464                 }
 465
 466                 public DeclSpace GenericDeclContainer {
 467                         get { return DeclContainer; }
 468                 }
 469
 470                 public bool CheckState {
 471                         get { return (flags & Flags.CheckState) != 0; }
 472                 }
 473
 474                 public bool ConstantCheckState {
 475                         get { return (flags & Flags.ConstantCheckState) != 0; }
 476                 }
 477
 478                 public bool InUnsafe {
 479                         get { return (flags & Flags.InUnsafe) != 0; }
 480                 }
 481
 482                 public bool InCatch {
 483                         get { return (flags & Flags.InCatch) != 0; }
 484                 }
 485
 486                 public bool InFinally {
 487                         get { return (flags & Flags.InFinally) != 0; }
 488                 }
 489
 490                 public bool DoFlowAnalysis {
 491                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 492                 }
 493
 494                 public bool OmitStructFlowAnalysis {
 495                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 496                 }
 497
 498                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 499                 // it's public so that we can use a struct at the callsite
 500                 public struct FlagsHandle : IDisposable
 501                 {
 502                         EmitContext ec;
 503                         Flags invmask, oldval;
 504                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 505                         {
 506                                 this.ec = ec;
 507                                 invmask = ~mask;
 508                                 oldval = ec.flags & mask;
 509                                 ec.flags = (ec.flags & invmask) | (val & mask);
 510                         }
 511                         public void Dispose ()
 512                         {
 513                                 ec.flags = (ec.flags & invmask) | oldval;
 514                         }
 515                 }
 516
 517                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 518                 public FlagsHandle With (Flags bits, bool enable)
 519                 {
 520                         return new FlagsHandle (this, bits, enable ? bits : 0);
 521                 }
 522
 523                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 524                 {
 525                         Flags newflags =
 526                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 527                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 528                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 529                 }
 530
 531                 public bool IsInObsoleteScope {
 532                         get { return ResolveContext.IsInObsoleteScope; }
 533                 }
 534
 535                 public bool IsInUnsafeScope {
 536                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 537                 }
 538
 539                 public bool IsAnonymousMethodAllowed {
 540                         get { return isAnonymousMethodAllowed; }
 541                         set { isAnonymousMethodAllowed = value; }
 542                 }
 543
 544                 public FlowBranching CurrentBranching {
 545                         get { return current_flow_branching; }
 546                 }
 547
 548                 public bool HaveCaptureInfo {
 549                         get { return capture_context != null; }
 550                 }
 551
 552                 public void EmitScopeInitFromBlock (Block b)
 553                 {
 554                         if (capture_context != null)
 555                                 capture_context.EmitScopeInitFromBlock (this, b);
 556                 }
 557
 558                 // <summary>
 559                 //   Starts a new code branching.  This inherits the state of all local
 560                 //   variables and parameters from the current branching.
 561                 // </summary>
 562                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 563                 {
 564                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 565                         return current_flow_branching;
 566                 }
 567
 568                 // <summary>
 569                 //   Starts a new code branching for block `block'.
 570                 // </summary>
 571                 public FlowBranching StartFlowBranching (Block block)
 572                 {
 573                         FlowBranching.BranchingType type;
 574
 575                         if ((CurrentBranching != null) &&
 576                             (CurrentBranching.Type == FlowBranching.BranchingType.Switch))
 577                                 type = FlowBranching.BranchingType.SwitchSection;
 578                         else
 579                                 type = FlowBranching.BranchingType.Block;
 580
 581                         flags |= Flags.DoFlowAnalysis;
 582
 583                         current_flow_branching = FlowBranching.CreateBranching (
 584                                 CurrentBranching, type, block, block.StartLocation);
 585                         return current_flow_branching;
 586                 }
 587
 588                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 589                 {
 590                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 591                         current_flow_branching = branching;
 592                         return branching;
 593                 }
 594
 595                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 596                 {
 597                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 598                         current_flow_branching = branching;
 599                         return branching;
 600                 }
 601
 602                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 603                 {
 604                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 605                         current_flow_branching = branching;
 606                         return branching;
 607                 }
 608
 609                 // <summary>
 610                 //   Ends a code branching.  Merges the state of locals and parameters
 611                 //   from all the children of the ending branching.
 612                 // </summary>
 613                 public FlowBranching.UsageVector DoEndFlowBranching ()
 614                 {
 615                         FlowBranching old = current_flow_branching;
 616                         current_flow_branching = current_flow_branching.Parent;
 617
 618                         return current_flow_branching.MergeChild (old);
 619                 }
 620
 621                 // <summary>
 622                 //   Ends a code branching.  Merges the state of locals and parameters
 623                 //   from all the children of the ending branching.
 624                 // </summary>
 625                 public FlowBranching.Reachability EndFlowBranching ()
 626                 {
 627                         FlowBranching.UsageVector vector = DoEndFlowBranching ();
 628
 629                         return vector.Reachability;
 630                 }
 631
 632                 // <summary>
 633                 //   Kills the current code branching.  This throws away any changed state
 634                 //   information and should only be used in case of an error.
 635                 // </summary>
 636                 public void KillFlowBranching ()
 637                 {
 638                         current_flow_branching = current_flow_branching.Parent;
 639                 }
 640
 641                 public void CaptureVariable (LocalInfo li)
 642                 {
 643                         capture_context.AddLocal (CurrentAnonymousMethod, li);
 644                         li.IsCaptured = true;
 645                 }
 646
 647                 public void CaptureParameter (string name, Type t, int idx)
 648                 {
 649                         capture_context.AddParameter (this, CurrentAnonymousMethod, name, t, idx);
 650                 }
 651
 652                 public void CaptureThis ()
 653                 {
 654                         capture_context.CaptureThis (CurrentAnonymousMethod);
 655                 }
 656
 657
 658                 //
 659                 // Use to register a field as captured
 660                 //
 661                 public void CaptureField (FieldExpr fe)
 662                 {
 663                         capture_context.AddField (this, CurrentAnonymousMethod, fe);
 664                 }
 665
 666                 //
 667                 // Whether anonymous methods have captured variables
 668                 //
 669                 public bool HaveCapturedVariables ()
 670                 {
 671                         if (capture_context != null)
 672                                 return capture_context.HaveCapturedVariables;
 673                         return false;
 674                 }
 675
 676                 //
 677                 // Whether anonymous methods have captured fields or this.
 678                 //
 679                 public bool HaveCapturedFields ()
 680                 {
 681                         if (capture_context != null)
 682                                 return capture_context.HaveCapturedFields;
 683                         return false;
 684                 }
 685
 686                 //
 687                 // Emits the instance pointer for the host method
 688                 //
 689                 public void EmitMethodHostInstance (EmitContext target, AnonymousMethod am)
 690                 {
 691                         if (capture_context != null)
 692                                 capture_context.EmitMethodHostInstance (target, am);
 693                         else if (IsStatic)
 694                                 target.ig.Emit (OpCodes.Ldnull);
 695                         else
 696                                 target.ig.Emit (OpCodes.Ldarg_0);
 697                 }
 698
 699                 //
 700                 // Returns whether the `local' variable has been captured by an anonymous
 701                 // method
 702                 //
 703                 public bool IsCaptured (LocalInfo local)
 704                 {
 705                         return capture_context.IsCaptured (local);
 706                 }
 707
 708                 public bool IsParameterCaptured (string name)
 709                 {
 710                         if (capture_context != null)
 711                                 return capture_context.IsParameterCaptured (name);
 712                         return false;
 713                 }
 714
 715                 public void EmitMeta (ToplevelBlock b)
 716                 {
 717                         if (capture_context != null)
 718                                 capture_context.EmitAnonymousHelperClasses (this);
 719                         b.EmitMeta (this);
 720
 721                         if (HasReturnLabel)
 722                                 ReturnLabel = ig.DefineLabel ();
 723                 }
 724
 725                 //
 726                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 727                 // currently can not cope with ig == null during resolve (which must
 728                 // be fixed for switch statements to work on anonymous methods).
 729                 //
 730                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 731                 {
 732                         if (block == null)
 733                                 return;
 734
 735                         bool unreachable;
 736
 737                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 738                                 EmitMeta (block);
 739
 740                                 current_phase = Phase.Emitting;
 741                                 EmitResolvedTopBlock (block, unreachable);
 742                         }
 743                 }
 744
 745                 bool resolved;
 746
 747                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 748                                              Parameters ip, IMethodData md, out bool unreachable)
 749                 {
 750                         current_phase = Phase.Resolving;
 751
 752                         unreachable = false;
 753
 754                         if (resolved)
 755                                 return true;
 756
 757                         capture_context = block.CaptureContext;
 758
 759                         if (!loc.IsNull)
 760                                 CurrentFile = loc.File;
 761
 762 #if PRODUCTION
 763                         try {
 764 #endif
 765                                 if (!block.ResolveMeta (this, ip))
 766                                         return false;
 767
 768                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 769                                         FlowBranchingToplevel top_level;
 770                                         if (anonymous_method_host != null)
 771                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 772                                         else
 773                                                 top_level = block.TopLevelBranching;
 774
 775                                         current_flow_branching = top_level;
 776                                         bool ok = block.Resolve (this);
 777                                         current_flow_branching = null;
 778
 779                                         if (!ok)
 780                                                 return false;
 781
 782                                         FlowBranching.Reachability reachability = top_level.End ();
 783                                         if (reachability.IsUnreachable)
 784                                                 unreachable = true;
 785                                 }
 786 #if PRODUCTION
 787                         } catch (Exception e) {
 788                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 789                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 790
 791                                 if (CurrentBlock != null){
 792                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 793                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 794                                 }
 795                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 796                                 throw;
 797                         }
 798 #endif
 799
 800                         if (ReturnType != null && !unreachable) {
 801                                 if (CurrentAnonymousMethod == null) {
 802                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 803                                         return false;
 804                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 805                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 806                                                 CurrentAnonymousMethod.GetSignatureForError ());
 807                                         return false;
 808                                 }
 809                         }
 810
 811                         block.CompleteContexts ();
 812                         resolved = true;
 813                         return true;
 814                 }
 815
 816                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 817                 {
 818                         if (block != null)
 819                                 block.Emit (this);
 820
 821                         if (HasReturnLabel)
 822                                 ig.MarkLabel (ReturnLabel);
 823
 824                         if (return_value != null){
 825                                 ig.Emit (OpCodes.Ldloc, return_value);
 826                                 ig.Emit (OpCodes.Ret);
 827                         } else {
 828                                 //
 829                                 // If `HasReturnLabel' is set, then we already emitted a
 830                                 // jump to the end of the method, so we must emit a `ret'
 831                                 // there.
 832                                 //
 833                                 // Unfortunately, System.Reflection.Emit automatically emits
 834                                 // a leave to the end of a finally block.  This is a problem
 835                                 // if no code is following the try/finally block since we may
 836                                 // jump to a point after the end of the method.
 837                                 // As a workaround, we're always creating a return label in
 838                                 // this case.
 839                                 //
 840
 841                                 bool in_iterator = (CurrentAnonymousMethod != null) &&
 842                                         CurrentAnonymousMethod.IsIterator && InIterator;
 843
 844                                 if ((block != null) && block.IsDestructor) {
 845                                         // Nothing to do; S.R.E automatically emits a leave.
 846                                 } else if (HasReturnLabel || (!unreachable && !in_iterator)) {
 847                                         if (ReturnType != null)
 848                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 849                                         ig.Emit (OpCodes.Ret);
 850                                 }
 851                         }
 852
 853                         //
 854                         // Close pending helper classes if we are the toplevel
 855                         //
 856                         if (capture_context != null && capture_context.ParentToplevel == null)
 857                                 capture_context.CloseAnonymousHelperClasses ();
 858                 }
 859
 860                 /// <summary>
 861                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 862                 ///   writer to which source line this opcode belongs.
 863                 /// </summary>
 864                 public void Mark (Location loc, bool check_file)
 865                 {
 866                         if ((CodeGen.SymbolWriter == null) || loc.IsNull)
 867                                 return;
 868
 869                         if (check_file && (CurrentFile != loc.File))
 870                                 return;
 871
 872                         CodeGen.SymbolWriter.MarkSequencePoint (ig, loc.Row, loc.Column);
 873                 }
 874
 875                 public void DefineLocalVariable (string name, LocalBuilder builder)
 876                 {
 877                         if (CodeGen.SymbolWriter == null)
 878                                 return;
 879
 880                         CodeGen.SymbolWriter.DefineLocalVariable (name, builder);
 881                 }
 882
 883                 public void BeginScope ()
 884                 {
 885                         ig.BeginScope();
 886
 887                         if (CodeGen.SymbolWriter != null)
 888                                 CodeGen.SymbolWriter.OpenScope(ig);
 889                 }
 890
 891                 public void EndScope ()
 892                 {
 893                         ig.EndScope();
 894
 895                         if (CodeGen.SymbolWriter != null)
 896                                 CodeGen.SymbolWriter.CloseScope(ig);
 897                 }
 898
 899                 /// <summary>
 900                 ///   Returns a temporary storage for a variable of type t as
 901                 ///   a local variable in the current body.
 902                 /// </summary>
 903                 public LocalBuilder GetTemporaryLocal (Type t)
 904                 {
 905                         if (temporary_storage != null) {
 906                                 object o = temporary_storage [t];
 907                                 if (o != null) {
 908                                         if (o is Stack) {
 909                                                 Stack s = (Stack) o;
 910                                                 o = s.Count == 0 ? null : s.Pop ();
 911                                         } else {
 912                                                 temporary_storage.Remove (t);
 913                                         }
 914                                 }
 915                                 if (o != null)
 916                                         return (LocalBuilder) o;
 917                         }
 918                         return ig.DeclareLocal (t);
 919                 }
 920
 921                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 922                 {
 923                         Stack s;
 924
 925                         if (temporary_storage == null) {
 926                                 temporary_storage = new Hashtable ();
 927                                 temporary_storage [t] = b;
 928                                 return;
 929                         }
 930                         object o = temporary_storage [t];
 931                         if (o == null) {
 932                                 temporary_storage [t] = b;
 933                                 return;
 934                         }
 935                         if (o is Stack) {
 936                                 s = (Stack) o;
 937                         } else {
 938                                 s = new Stack ();
 939                                 s.Push (o);
 940                                 temporary_storage [t] = s;
 941                         }
 942                         s.Push (b);
 943                 }
 944
 945                 /// <summary>
 946                 ///   Current loop begin and end labels.
 947                 /// </summary>
 948                 public Label LoopBegin, LoopEnd;
 949
 950                 /// <summary>
 951                 ///   Default target in a switch statement.   Only valid if
 952                 ///   InSwitch is true
 953                 /// </summary>
 954                 public Label DefaultTarget;
 955
 956                 /// <summary>
 957                 ///   If this is non-null, points to the current switch statement
 958                 /// </summary>
 959                 public Switch Switch;
 960
 961                 /// <summary>
 962                 ///   ReturnValue creates on demand the LocalBuilder for the
 963                 ///   return value from the function.  By default this is not
 964                 ///   used.  This is only required when returns are found inside
 965                 ///   Try or Catch statements.
 966                 ///
 967                 ///   This method is typically invoked from the Emit phase, so
 968                 ///   we allow the creation of a return label if it was not
 969                 ///   requested during the resolution phase.   Could be cleaned
 970                 ///   up, but it would replicate a lot of logic in the Emit phase
 971                 ///   of the code that uses it.
 972                 /// </summary>
 973                 public LocalBuilder TemporaryReturn ()
 974                 {
 975                         if (return_value == null){
 976                                 return_value = ig.DeclareLocal (ReturnType);
 977                                 if (!HasReturnLabel){
 978                                         ReturnLabel = ig.DefineLabel ();
 979                                         HasReturnLabel = true;
 980                                 }
 981                         }
 982
 983                         return return_value;
 984                 }
 985
 986                 /// <summary>
 987                 ///   This method is used during the Resolution phase to flag the
 988                 ///   need to define the ReturnLabel
 989                 /// </summary>
 990                 public void NeedReturnLabel ()
 991                 {
 992                         if (current_phase != Phase.Resolving){
 993                                 //
 994                                 // The reason is that the `ReturnLabel' is declared between
 995                                 // resolution and emission
 996                                 //
 997                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
 998                         }
 999
1000                         if (!InIterator && !HasReturnLabel)
1001                                 HasReturnLabel = true;
1002                 }
1003
1004                 //
1005                 // Emits the proper object to address fields on a remapped
1006                 // variable/parameter to field in anonymous-method/iterator proxy classes.
1007                 //
1008                 public void EmitThis (bool need_address)
1009                 {
1010                         ig.Emit (OpCodes.Ldarg_0);
1011                         if (capture_context != null && CurrentAnonymousMethod != null){
1012                                 ScopeInfo si = CurrentAnonymousMethod.Scope;
1013                                 while (si != null){
1014                                         if (si.ParentLink != null)
1015                                                 ig.Emit (OpCodes.Ldfld, si.ParentLink);
1016                                         if (si.THIS != null){
1017                                                 if (need_address && TypeManager.IsValueType (si.THIS.FieldType))
1018                                                         ig.Emit (OpCodes.Ldflda, si.THIS);
1019                                                 else
1020                                                         ig.Emit (OpCodes.Ldfld, si.THIS);
1021                                                 break;
1022                                         }
1023                                         si = si.ParentScope;
1024                                 }
1025                         }
1026                 }
1027
1028                 //
1029                 // Emits the code necessary to load the instance required
1030                 // to access the captured LocalInfo
1031                 //
1032                 public void EmitCapturedVariableInstance (LocalInfo li)
1033                 {
1034                         if (capture_context == null)
1035                                 throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
1036
1037                         capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
1038                 }
1039
1040                 public void EmitParameter (string name, bool leave_copy, bool prepared, ref LocalTemporary temp)
1041                 {
1042                         capture_context.EmitParameter (this, name, leave_copy, prepared, ref temp);
1043                 }
1044
1045                 public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load, ref LocalTemporary  temp)
1046                 {
1047                         capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load, ref temp);
1048                 }
1049
1050                 public void EmitAddressOfParameter (string name)
1051                 {
1052                         capture_context.EmitAddressOfParameter (this, name);
1053                 }
1054
1055                 public Expression GetThis (Location loc)
1056                 {
1057                         This my_this;
1058                         if (CurrentBlock != null)
1059                                 my_this = new This (CurrentBlock, loc);
1060                         else
1061                                 my_this = new This (loc);
1062
1063                         if (!my_this.ResolveBase (this))
1064                                 my_this = null;
1065
1066                         return my_this;
1067                 }
1068         }
1069
1070
1071         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
1072
1073                 protected CommonAssemblyModulClass ():
1074                         base (null)
1075                 {
1076                 }
1077
1078                 public void AddAttributes (ArrayList attrs)
1079                 {
1080                         foreach (Attribute a in attrs)
1081                                 a.AttachTo (this);
1082
1083                         if (attributes == null) {
1084                                 attributes = new Attributes (attrs);
1085                                 return;
1086                         }
1087                         attributes.AddAttributes (attrs);
1088                 }
1089
1090                 public virtual void Emit (TypeContainer tc)
1091                 {
1092                         if (OptAttributes == null)
1093                                 return;
1094
1095                         OptAttributes.Emit ();
1096                 }
1097
1098                 protected Attribute ResolveAttribute (Type a_type)
1099                 {
1100                         Attribute a = OptAttributes.Search (a_type);
1101                         if (a != null) {
1102                                 a.Resolve ();
1103                         }
1104                         return a;
1105                 }
1106
1107                 public override IResolveContext ResolveContext {
1108                         get { return this; }
1109                 }
1110
1111                 #region IResolveContext Members
1112
1113                 public DeclSpace DeclContainer {
1114                         get { return RootContext.ToplevelTypes; }
1115                 }
1116
1117                 public DeclSpace GenericDeclContainer {
1118                         get { return DeclContainer; }
1119                 }
1120
1121                 public bool IsInObsoleteScope {
1122                         get { return false; }
1123                 }
1124
1125                 public bool IsInUnsafeScope {
1126                         get { return false; }
1127                 }
1128
1129                 #endregion
1130         }
1131
1132         public class AssemblyClass : CommonAssemblyModulClass {
1133                 // TODO: make it private and move all builder based methods here
1134                 public AssemblyBuilder Builder;
1135                 bool is_cls_compliant;
1136                 bool wrap_non_exception_throws;
1137
1138                 public Attribute ClsCompliantAttribute;
1139
1140                 ListDictionary declarative_security;
1141 #if GMCS_SOURCE
1142                 public AssemblyName Name;
1143                 MethodInfo add_type_forwarder;
1144 #endif
1145
1146                 // Module is here just because of error messages
1147                 static string[] attribute_targets = new string [] { "assembly", "module" };
1148
1149                 public AssemblyClass (): base ()
1150                 {
1151                         wrap_non_exception_throws = true;
1152                 }
1153
1154                 public bool IsClsCompliant {
1155                         get {
1156                                 return is_cls_compliant;
1157                         }
1158                 }
1159
1160                 public bool WrapNonExceptionThrows {
1161                         get {
1162                                 return wrap_non_exception_throws;
1163                         }
1164                 }
1165
1166                 public override AttributeTargets AttributeTargets {
1167                         get {
1168                                 return AttributeTargets.Assembly;
1169                         }
1170                 }
1171
1172                 public override bool IsClsComplianceRequired ()
1173                 {
1174                         return is_cls_compliant;
1175                 }
1176
1177                 public void Resolve ()
1178                 {
1179                         if (OptAttributes == null)
1180                                 return;
1181
1182                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
1183                         if (!OptAttributes.CheckTargets())
1184                                 return;
1185
1186                         ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1187                         if (ClsCompliantAttribute != null) {
1188                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1189                         }
1190
1191 #if GMCS_SOURCE
1192                         Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
1193                         if (a != null) {
1194                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1195                                 if (val != null)
1196                                         wrap_non_exception_throws = (bool)val;
1197                         }
1198 #endif
1199                 }
1200
1201                 // fix bug #56621
1202                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1203                 {
1204                         try {
1205                                 // check for possible ECMA key
1206                                 if (strongNameBlob.Length == 16) {
1207                                         // will be rejected if not "the" ECMA key
1208                                         an.SetPublicKey (strongNameBlob);
1209                                 }
1210                                 else {
1211                                         // take it, with or without, a private key
1212                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1213                                         // and make sure we only feed the public part to Sys.Ref
1214                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1215
1216                                         // AssemblyName.SetPublicKey requires an additional header
1217                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1218
1219                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1220                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1221                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1222                                         an.SetPublicKey (encodedPublicKey);
1223                                 }
1224                         }
1225                         catch (Exception) {
1226                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1227                                 Environment.Exit (1);
1228                         }
1229                 }
1230
1231                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1232                 public AssemblyName GetAssemblyName (string name, string output)
1233                 {
1234                         if (OptAttributes != null) {
1235                                 foreach (Attribute a in OptAttributes.Attrs) {
1236                                         // cannot rely on any resolve-based members before you call Resolve
1237                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1238                                                 continue;
1239
1240                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1241                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1242                                         //       are loaded yet.
1243                                         // TODO: Does not handle quoted attributes properly
1244                                         switch (a.Name) {
1245                                                 case "AssemblyKeyFile":
1246                                                 case "AssemblyKeyFileAttribute":
1247                                                 case "System.Reflection.AssemblyKeyFileAttribute":
1248                                                         if (RootContext.StrongNameKeyFile != null) {
1249                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1250                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1251                                     "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1252                                                         }
1253                                                         else {
1254                                                                 string value = a.GetString ();
1255                                                                 if (value.Length != 0)
1256                                                                         RootContext.StrongNameKeyFile = value;
1257                                                         }
1258                                                         break;
1259                                                 case "AssemblyKeyName":
1260                                                 case "AssemblyKeyNameAttribute":
1261                                                 case "System.Reflection.AssemblyKeyNameAttribute":
1262                                                         if (RootContext.StrongNameKeyContainer != null) {
1263                                                                 Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1264                                                                 Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1265                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1266                                                         }
1267                                                         else {
1268                                                                 string value = a.GetString ();
1269                                                                 if (value.Length != 0)
1270                                                                         RootContext.StrongNameKeyContainer = value;
1271                                                         }
1272                                                         break;
1273                                                 case "AssemblyDelaySign":
1274                                                 case "AssemblyDelaySignAttribute":
1275                                                 case "System.Reflection.AssemblyDelaySignAttribute":
1276                                                         RootContext.StrongNameDelaySign = a.GetBoolean ();
1277                                                         break;
1278                                         }
1279                                 }
1280                         }
1281
1282                         AssemblyName an = new AssemblyName ();
1283                         an.Name = Path.GetFileNameWithoutExtension (name);
1284
1285                         // note: delay doesn't apply when using a key container
1286                         if (RootContext.StrongNameKeyContainer != null) {
1287                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1288                                 return an;
1289                         }
1290
1291                         // strongname is optional
1292                         if (RootContext.StrongNameKeyFile == null)
1293                                 return an;
1294
1295                         string AssemblyDir = Path.GetDirectoryName (output);
1296
1297                         // the StrongName key file may be relative to (a) the compiled
1298                         // file or (b) to the output assembly. See bugzilla #55320
1299                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1300
1301                         // (a) relative to the compiled file
1302                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1303                         bool exist = File.Exists (filename);
1304                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1305                                 // (b) relative to the outputed assembly
1306                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1307                                 exist = File.Exists (filename);
1308                         }
1309
1310                         if (exist) {
1311                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1312                                         byte[] snkeypair = new byte [fs.Length];
1313                                         fs.Read (snkeypair, 0, snkeypair.Length);
1314
1315                                         if (RootContext.StrongNameDelaySign) {
1316                                                 // delayed signing - DO NOT include private key
1317                                                 SetPublicKey (an, snkeypair);
1318                                         }
1319                                         else {
1320                                                 // no delay so we make sure we have the private key
1321                                                 try {
1322                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1323                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1324                                                 }
1325                                                 catch (CryptographicException) {
1326                                                         if (snkeypair.Length == 16) {
1327                                                                 // error # is different for ECMA key
1328                                                                 Report.Error (1606, "Could not sign the assembly. " +
1329                                                                         "ECMA key can only be used to delay-sign assemblies");
1330                                                         }
1331                                                         else {
1332                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1333                                                         }
1334                                                         return null;
1335                                                 }
1336                                         }
1337                                 }
1338                         }
1339                         else {
1340                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1341                                 return null;
1342                         }
1343                         return an;
1344                 }
1345
1346                 void Error_AssemblySigning (string text)
1347                 {
1348                         Report.Error (1548, "Error during assembly signing. " + text);
1349                 }
1350
1351 #if GMCS_SOURCE
1352                 bool CheckInternalsVisibleAttribute (Attribute a)
1353                 {
1354                         string assembly_name = a.GetString ();
1355                         if (assembly_name.Length == 0)
1356                                 return false;
1357
1358                         AssemblyName aname = null;
1359                         try {
1360                                 aname = new AssemblyName (assembly_name);
1361                         } catch (FileLoadException) {
1362                         } catch (ArgumentException) {
1363                         }
1364
1365                         // Bad assembly name format
1366                         if (aname == null)
1367                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1368                         // Report error if we have defined Version or Culture
1369                         else if (aname.Version != null || aname.CultureInfo != null)
1370                                 throw new Exception ("Friend assembly `" + a.GetString () +
1371                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1372                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null) {
1373                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1374                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1375                                 return false;
1376                         }
1377
1378                         return true;
1379                 }
1380 #endif
1381
1382                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1383                 {
1384                         if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
1385                                 if (declarative_security == null)
1386                                         declarative_security = new ListDictionary ();
1387
1388                                 a.ExtractSecurityPermissionSet (declarative_security);
1389                                 return;
1390                         }
1391
1392                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1393                                 string value = a.GetString ();
1394                                 if (value == null || value.Length == 0)
1395                                         return;
1396
1397                                 if (RootContext.Target == Target.Exe) {
1398                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1399                                         return;
1400                                 }
1401                         }
1402
1403 #if GMCS_SOURCE
1404                         if (a.Type == TypeManager.internals_visible_attr_type && !CheckInternalsVisibleAttribute (a))
1405                                 return;
1406
1407                         if (a.Type == TypeManager.type_forwarder_attr_type) {
1408                                 Type t = a.GetArgumentType ();
1409                                 if (t == null || TypeManager.HasElementType (t)) {
1410                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1411                                         return;
1412                                 }
1413
1414                                 if (TypeManager.LookupDeclSpace (t) != null) {
1415                                         Report.SymbolRelatedToPreviousError (t);
1416                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1417                                                 TypeManager.CSharpName (t));
1418                                         return;
1419                                 }
1420
1421                                 if (t.IsNested) {
1422                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1423                                                 TypeManager.CSharpName (t));
1424                                         return;
1425                                 }
1426
1427                                 if (t.IsGenericType) {
1428                                         Report.Error (733, a.Location, "Cannot forward generic type `{0}'", TypeManager.CSharpName (t));
1429                                         return;
1430                                 }
1431
1432                                 if (add_type_forwarder == null) {
1433                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1434                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1435
1436                                         if (add_type_forwarder == null) {
1437                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1438                                                 return;
1439                                         }
1440                                 }
1441
1442                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1443                                 return;
1444                         }
1445
1446 #endif
1447                         Builder.SetCustomAttribute (customBuilder);
1448                 }
1449
1450                 public override void Emit (TypeContainer tc)
1451                 {
1452                         base.Emit (tc);
1453
1454 #if GMCS_SOURCE
1455                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1456                         if (OptAttributes == null || !OptAttributes.Contains (TypeManager.runtime_compatibility_attr_type)) {
1457                                 ConstructorInfo ci = TypeManager.GetConstructor (
1458                                         TypeManager.runtime_compatibility_attr_type, Type.EmptyTypes);
1459                                 PropertyInfo [] pis = new PropertyInfo [1];
1460                                 pis [0] = TypeManager.GetProperty (
1461                                         TypeManager.runtime_compatibility_attr_type, "WrapNonExceptionThrows");
1462                                 object [] pargs = new object [1];
1463                                 pargs [0] = true;
1464                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1465                         }
1466 #endif
1467
1468                         if (declarative_security != null) {
1469
1470                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1471                                 object builder_instance = Builder;
1472
1473                                 try {
1474                                         // Microsoft runtime hacking
1475                                         if (add_permission == null) {
1476                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1477                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1478
1479                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1480                                                 builder_instance = fi.GetValue (Builder);
1481                                         }
1482
1483                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1484                                                                                                   declarative_security [SecurityAction.RequestOptional],
1485                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1486                                         add_permission.Invoke (builder_instance, args);
1487                                 }
1488                                 catch {
1489                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1490                                 }
1491                         }
1492                 }
1493
1494                 public override string[] ValidAttributeTargets {
1495                         get {
1496                                 return attribute_targets;
1497                         }
1498                 }
1499         }
1500
1501         public class ModuleClass : CommonAssemblyModulClass {
1502                 // TODO: make it private and move all builder based methods here
1503                 public ModuleBuilder Builder;
1504                 bool m_module_is_unsafe;
1505
1506                 public CharSet DefaultCharSet = CharSet.Ansi;
1507                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1508
1509                 static string[] attribute_targets = new string [] { "module" };
1510
1511                 public ModuleClass (bool is_unsafe)
1512                 {
1513                         m_module_is_unsafe = is_unsafe;
1514                 }
1515
1516                 public override AttributeTargets AttributeTargets {
1517                         get {
1518                                 return AttributeTargets.Module;
1519                         }
1520                 }
1521
1522                 public override bool IsClsComplianceRequired ()
1523                 {
1524                         return CodeGen.Assembly.IsClsCompliant;
1525                 }
1526
1527                 public override void Emit (TypeContainer tc)
1528                 {
1529                         base.Emit (tc);
1530
1531                         if (!m_module_is_unsafe)
1532                                 return;
1533
1534                         if (TypeManager.unverifiable_code_ctor == null) {
1535                                 Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
1536                                 return;
1537                         }
1538
1539                         Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
1540                 }
1541
1542                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1543                 {
1544                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1545                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1546                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1547                                 }
1548                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1549                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1550                                         Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1551                                         return;
1552                                 }
1553                         }
1554
1555                         Builder.SetCustomAttribute (customBuilder);
1556                 }
1557
1558                 /// <summary>
1559                 /// It is called very early therefore can resolve only predefined attributes
1560                 /// </summary>
1561                 public void Resolve ()
1562                 {
1563 #if GMCS_SOURCE
1564                         if (OptAttributes == null)
1565                                 return;
1566
1567                         if (!OptAttributes.CheckTargets())
1568                                 return;
1569
1570                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1571                         if (a != null) {
1572                                 DefaultCharSet = a.GetCharSetValue ();
1573                                 switch (DefaultCharSet) {
1574                                         case CharSet.Ansi:
1575                                         case CharSet.None:
1576                                                 break;
1577                                         case CharSet.Auto:
1578                                                 DefaultCharSetType = TypeAttributes.AutoClass;
1579                                                 break;
1580                                         case CharSet.Unicode:
1581                                                 DefaultCharSetType = TypeAttributes.UnicodeClass;
1582                                                 break;
1583                                         default:
1584                                                 Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1585                                                 break;
1586                                 }
1587                         }
1588 #endif
1589                 }
1590
1591                 public override string[] ValidAttributeTargets {
1592                         get {
1593                                 return attribute_targets;
1594                         }
1595                 }
1596         }
1597 }