mcs/mcs/codegen.cs

   1 //
   2 // codegen.cs: The code generator
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //
   7 // Copyright 2001, 2002, 2003 Ximian, Inc.
   8 // Copyright 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.Globalization;
  25 using System.Reflection;
  26 using System.Reflection.Emit;
  27 using System.Runtime.InteropServices;
  28 using System.Security;
  29 using System.Security.Cryptography;
  30 using System.Security.Permissions;
  31
  32 using Mono.Security.Cryptography;
  33
  34 namespace Mono.CSharp {
  35
  36         /// <summary>
  37         ///    Code generator class.
  38         /// </summary>
  39         public class CodeGen {
  40                 static AppDomain current_domain;
  41
  42                 public static AssemblyClass Assembly;
  43
  44                 static CodeGen ()
  45                 {
  46                         Reset ();
  47                 }
  48
  49                 public static void Reset ()
  50                 {
  51                         Assembly = new AssemblyClass ();
  52                 }
  53
  54                 public static string Basename (string name)
  55                 {
  56                         int pos = name.LastIndexOf ('/');
  57
  58                         if (pos != -1)
  59                                 return name.Substring (pos + 1);
  60
  61                         pos = name.LastIndexOf ('\\');
  62                         if (pos != -1)
  63                                 return name.Substring (pos + 1);
  64
  65                         return name;
  66                 }
  67
  68                 public static string Dirname (string name)
  69                 {
  70                         int pos = name.LastIndexOf ('/');
  71
  72                         if (pos != -1)
  73                                 return name.Substring (0, pos);
  74
  75                         pos = name.LastIndexOf ('\\');
  76                         if (pos != -1)
  77                                 return name.Substring (0, pos);
  78
  79                         return ".";
  80                 }
  81
  82                 static public string FileName;
  83
  84 #if MS_COMPATIBLE
  85                 const AssemblyBuilderAccess COMPILER_ACCESS = 0;
  86 #else
  87                 /* Keep this in sync with System.Reflection.Emit.AssemblyBuilder */
  88                 const AssemblyBuilderAccess COMPILER_ACCESS = (AssemblyBuilderAccess) 0x800;
  89 #endif
  90
  91                 //
  92                 // Initializes the code generator variables for interactive use (repl)
  93                 //
  94                 static public void InitDynamic (string name)
  95                 {
  96                         current_domain = AppDomain.CurrentDomain;
  97                         AssemblyName an = Assembly.GetAssemblyName (name, name);
  98
  99                         Assembly.Builder = current_domain.DefineDynamicAssembly (an, AssemblyBuilderAccess.Run | COMPILER_ACCESS);
 100                         RootContext.ToplevelTypes = new ModuleContainer (true);
 101                         RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (Basename (name), false);
 102                         Assembly.Name = Assembly.Builder.GetName ();
 103                 }
 104
 105                 //
 106                 // Initializes the code generator variables
 107                 //
 108                 static public bool Init (string name, string output, bool want_debugging_support)
 109                 {
 110                         FileName = output;
 111                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 112                         if (an == null)
 113                                 return false;
 114
 115                         if (an.KeyPair != null) {
 116                                 // If we are going to strong name our assembly make
 117                                 // sure all its refs are strong named
 118                                 foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
 119                                         AssemblyName ref_name = a.GetName ();
 120                                         byte [] b = ref_name.GetPublicKeyToken ();
 121                                         if (b == null || b.Length == 0) {
 122                                                 Report.Error (1577, "Assembly generation failed " +
 123                                                                 "-- Referenced assembly '" +
 124                                                                 ref_name.Name +
 125                                                                 "' does not have a strong name.");
 126                                                 //Environment.Exit (1);
 127                                         }
 128                                 }
 129                         }
 130
 131                         current_domain = AppDomain.CurrentDomain;
 132
 133                         try {
 134                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 135                                         AssemblyBuilderAccess.RunAndSave | COMPILER_ACCESS, Dirname (name));
 136                         }
 137                         catch (ArgumentException) {
 138                                 // specified key may not be exportable outside it's container
 139                                 if (RootContext.StrongNameKeyContainer != null) {
 140                                         Report.Error (1548, "Could not access the key inside the container `" +
 141                                                 RootContext.StrongNameKeyContainer + "'.");
 142                                         Environment.Exit (1);
 143                                 }
 144                                 throw;
 145                         }
 146                         catch (CryptographicException) {
 147                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 148                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 149                                         Environment.Exit (1);
 150                                 }
 151                                 return false;
 152                         }
 153
 154                         // Get the complete AssemblyName from the builder
 155                         // (We need to get the public key and token)
 156                         Assembly.Name = Assembly.Builder.GetName ();
 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                         try {
 167                                 RootContext.ToplevelTypes.Builder = Assembly.Builder.DefineDynamicModule (
 168                                         Basename (name), Basename (output), want_debugging_support);
 169
 170 #if !MS_COMPATIBLE
 171                                 // TODO: We should use SymbolWriter from DefineDynamicModule
 172                                 if (want_debugging_support && !SymbolWriter.Initialize (RootContext.ToplevelTypes.Builder, output)) {
 173                                         Report.Error (40, "Unexpected debug information initialization error `{0}'",
 174                                                 "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll)");
 175                                         return false;
 176                                 }
 177 #endif
 178                         } catch (ExecutionEngineException e) {
 179                                 Report.Error (40, "Unexpected debug information initialization error `{0}'",
 180                                         e.Message);
 181                                 return false;
 182                         }
 183
 184                         return true;
 185                 }
 186
 187                 static public void Save (string name, bool saveDebugInfo)
 188                 {
 189 #if GMCS_SOURCE
 190                         PortableExecutableKinds pekind;
 191                         ImageFileMachine machine;
 192
 193                         switch (RootContext.Platform) {
 194                         case Platform.X86:
 195                                 pekind = PortableExecutableKinds.Required32Bit;
 196                                 machine = ImageFileMachine.I386;
 197                                 break;
 198                         case Platform.X64:
 199                                 pekind = PortableExecutableKinds.PE32Plus;
 200                                 machine = ImageFileMachine.AMD64;
 201                                 break;
 202                         case Platform.IA64:
 203                                 pekind = PortableExecutableKinds.PE32Plus;
 204                                 machine = ImageFileMachine.IA64;
 205                                 break;
 206                         case Platform.AnyCPU:
 207                         default:
 208                                 pekind = PortableExecutableKinds.ILOnly;
 209                                 machine = ImageFileMachine.I386;
 210                                 break;
 211                         }
 212 #endif
 213                         try {
 214 #if GMCS_SOURCE
 215                                 Assembly.Builder.Save (Basename (name), pekind, machine);
 216 #else
 217                                 Assembly.Builder.Save (Basename (name));
 218 #endif
 219                         }
 220                         catch (COMException) {
 221                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 222                                         throw;
 223
 224                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 225                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 226                                         RootContext.StrongNameKeyFile +
 227                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 228                         }
 229                         catch (System.IO.IOException io) {
 230                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 231                                 return;
 232                         }
 233                         catch (System.UnauthorizedAccessException ua) {
 234                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 235                                 return;
 236                         }
 237                         catch (System.NotImplementedException nie) {
 238                                 Report.RuntimeMissingSupport (Location.Null, nie.Message);
 239                                 return;
 240                         }
 241
 242                         //
 243                         // Write debuger symbol file
 244                         //
 245                         if (saveDebugInfo)
 246                                 SymbolWriter.WriteSymbolFile ();
 247                         }
 248         }
 249
 250
 251         /// <summary>
 252         /// An interface to hold all the information needed in the resolving phase.
 253         /// </summary>
 254         public interface IResolveContext
 255         {
 256                 //
 257                 // A scope type context, it can be inflated for generic types
 258                 //
 259                 Type CurrentType { get; }
 260
 261                 //
 262                 // A scope type parameters either VAR or MVAR
 263                 //
 264                 TypeParameter[] CurrentTypeParameters { get; }
 265
 266                 //
 267                 // A type definition of the type context. For partial types definition use
 268                 // CurrentTypeDefinition.PartialContainer otherwise the context is local
 269                 //
 270                 // TODO: CurrentType.Definition
 271                 //
 272                 TypeContainer CurrentTypeDefinition { get; }
 273
 274                 bool IsInObsoleteScope { get; }
 275                 bool IsInUnsafeScope { get; }
 276                 bool IsStatic { get; }
 277
 278                 ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc);
 279                 FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104);
 280                 FullNamedExpression LookupNamespaceAlias (string name);
 281         }
 282
 283         //
 284         // Block or statement resolving context
 285         //
 286         public class BlockContext : ResolveContext
 287         {
 288                 FlowBranching current_flow_branching;
 289
 290                 public BlockContext (IResolveContext mc, ExplicitBlock block, Type returnType)
 291                         : base (mc)
 292                 {
 293                         if (returnType == null)
 294                                 throw new ArgumentNullException ("returnType");
 295
 296                         this.return_type = returnType;
 297
 298                         // TODO: check for null value
 299                         CurrentBlock = block;
 300                 }
 301
 302                 public override FlowBranching CurrentBranching {
 303                         get { return current_flow_branching; }
 304                 }
 305
 306                 // <summary>
 307                 //   Starts a new code branching.  This inherits the state of all local
 308                 //   variables and parameters from the current branching.
 309                 // </summary>
 310                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 311                 {
 312                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 313                         return current_flow_branching;
 314                 }
 315
 316                 // <summary>
 317                 //   Starts a new code branching for block `block'.
 318                 // </summary>
 319                 public FlowBranching StartFlowBranching (Block block)
 320                 {
 321                         Set (Options.DoFlowAnalysis);
 322
 323                         current_flow_branching = FlowBranching.CreateBranching (
 324                                 CurrentBranching, FlowBranching.BranchingType.Block, block, block.StartLocation);
 325                         return current_flow_branching;
 326                 }
 327
 328                 public FlowBranchingTryCatch StartFlowBranching (TryCatch stmt)
 329                 {
 330                         FlowBranchingTryCatch branching = new FlowBranchingTryCatch (CurrentBranching, stmt);
 331                         current_flow_branching = branching;
 332                         return branching;
 333                 }
 334
 335                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 336                 {
 337                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 338                         current_flow_branching = branching;
 339                         return branching;
 340                 }
 341
 342                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 343                 {
 344                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 345                         current_flow_branching = branching;
 346                         return branching;
 347                 }
 348
 349                 public FlowBranchingIterator StartFlowBranching (Iterator iterator)
 350                 {
 351                         FlowBranchingIterator branching = new FlowBranchingIterator (CurrentBranching, iterator);
 352                         current_flow_branching = branching;
 353                         return branching;
 354                 }
 355
 356                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt, FlowBranching parent)
 357                 {
 358                         FlowBranchingToplevel branching = new FlowBranchingToplevel (parent, stmt);
 359                         current_flow_branching = branching;
 360                         return branching;
 361                 }
 362
 363                 // <summary>
 364                 //   Ends a code branching.  Merges the state of locals and parameters
 365                 //   from all the children of the ending branching.
 366                 // </summary>
 367                 public bool EndFlowBranching ()
 368                 {
 369                         FlowBranching old = current_flow_branching;
 370                         current_flow_branching = current_flow_branching.Parent;
 371
 372                         FlowBranching.UsageVector vector = current_flow_branching.MergeChild (old);
 373                         return vector.IsUnreachable;
 374                 }
 375
 376                 // <summary>
 377                 //   Kills the current code branching.  This throws away any changed state
 378                 //   information and should only be used in case of an error.
 379                 // </summary>
 380                 // FIXME: this is evil
 381                 public void KillFlowBranching ()
 382                 {
 383                         current_flow_branching = current_flow_branching.Parent;
 384                 }
 385
 386                 //
 387                 // This method is used during the Resolution phase to flag the
 388                 // need to define the ReturnLabel
 389                 //
 390                 public void NeedReturnLabel ()
 391                 {
 392                         if (!HasReturnLabel)
 393                                 HasReturnLabel = true;
 394                 }
 395         }
 396
 397         /// <summary>
 398         ///   An Emit Context is created for each body of code (from methods,
 399         ///   properties bodies, indexer bodies or constructor bodies)
 400         /// </summary>
 401         public class EmitContext : IResolveContext {
 402
 403                 [Flags]
 404                 public enum Options
 405                 {
 406                         /// <summary>
 407                         ///   This flag tracks the `checked' state of the compilation,
 408                         ///   it controls whether we should generate code that does overflow
 409                         ///   checking, or if we generate code that ignores overflows.
 410                         ///
 411                         ///   The default setting comes from the command line option to generate
 412                         ///   checked or unchecked code plus any source code changes using the
 413                         ///   checked/unchecked statements or expressions.   Contrast this with
 414                         ///   the ConstantCheckState flag.
 415                         /// </summary>
 416                         CheckedScope = 1 << 0,
 417
 418                         /// <summary>
 419                         ///   The constant check state is always set to `true' and cant be changed
 420                         ///   from the command line.  The source code can change this setting with
 421                         ///   the `checked' and `unchecked' statements and expressions.
 422                         /// </summary>
 423                         ConstantCheckState = 1 << 1,
 424
 425                         AllCheckStateFlags = CheckedScope | ConstantCheckState,
 426
 427                         //
 428                         // unsafe { ... } scope
 429                         //
 430                         UnsafeScope = 1 << 2,
 431                         CatchScope = 1 << 3,
 432                         FinallyScope = 1 << 4,
 433                         FieldInitializerScope = 1 << 5,
 434                         CompoundAssignmentScope = 1 << 6,
 435                         FixedInitializerScope = 1 << 7,
 436                         BaseInitializer = 1 << 8,
 437
 438                         //
 439                         // Inside an enum definition, we do not resolve enumeration values
 440                         // to their enumerations, but rather to the underlying type/value
 441                         // This is so EnumVal + EnumValB can be evaluated.
 442                         //
 443                         // There is no "E operator + (E x, E y)", so during an enum evaluation
 444                         // we relax the rules
 445                         //
 446                         EnumScope = 1 << 9,
 447
 448                         ConstantScope = 1 << 10,
 449
 450                         ConstructorScope = 1 << 11,
 451
 452                         /// <summary>
 453                         ///   Whether control flow analysis is enabled
 454                         /// </summary>
 455                         DoFlowAnalysis = 1 << 20,
 456
 457                         /// <summary>
 458                         ///   Whether control flow analysis is disabled on structs
 459                         ///   (only meaningful when DoFlowAnalysis is set)
 460                         /// </summary>
 461                         OmitStructFlowAnalysis = 1 << 21,
 462
 463                         ///
 464                         /// Indicates the current context is in probing mode, no errors are reported.
 465                         ///
 466                         ProbingMode = 1 <<      22,
 467
 468                         //
 469                         // Return and ContextualReturn statements will set the ReturnType
 470                         // value based on the expression types of each return statement
 471                         // instead of the method return type which is initially null.
 472                         //
 473                         InferReturnType = 1 << 23,
 474
 475                         OmitDebuggingInfo = 1 << 24
 476                 }
 477
 478                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 479                 // it's public so that we can use a struct at the callsite
 480                 public struct FlagsHandle : IDisposable
 481                 {
 482                         EmitContext ec;
 483                         readonly Options invmask, oldval;
 484
 485                         public FlagsHandle (EmitContext ec, Options flagsToSet)
 486                                 : this (ec, flagsToSet, flagsToSet)
 487                         {
 488                         }
 489
 490                         internal FlagsHandle (EmitContext ec, Options mask, Options val)
 491                         {
 492                                 this.ec = ec;
 493                                 invmask = ~mask;
 494                                 oldval = ec.flags & mask;
 495                                 ec.flags = (ec.flags & invmask) | (val & mask);
 496
 497                                 if ((mask & Options.ProbingMode) != 0)
 498                                         Report.DisableReporting ();
 499                         }
 500
 501                         public void Dispose ()
 502                         {
 503                                 if ((invmask & Options.ProbingMode) == 0)
 504                                         Report.EnableReporting ();
 505
 506                                 ec.flags = (ec.flags & invmask) | oldval;
 507                         }
 508                 }
 509
 510                 Options flags;
 511
 512                 //
 513                 // Holds a varible used during collection or object initialization.
 514                 //
 515                 public Expression CurrentInitializerVariable;
 516
 517                 public ILGenerator ig;
 518
 519                 /// <summary>
 520                 ///   The value that is allowed to be returned or NULL if there is no
 521                 ///   return type.
 522                 /// </summary>
 523                 protected Type return_type;
 524
 525                 /// <summary>
 526                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 527                 ///   to store structures (used to compute the address of the structure
 528                 ///   value on structure method invocations)
 529                 /// </summary>
 530                 public Hashtable temporary_storage;
 531
 532                 public Block CurrentBlock;
 533
 534                 /// <summary>
 535                 ///   The location where we store the return value.
 536                 /// </summary>
 537                 public LocalBuilder return_value;
 538
 539                 /// <summary>
 540                 ///   The location where return has to jump to return the
 541                 ///   value
 542                 /// </summary>
 543                 public Label ReturnLabel;
 544
 545                 /// <summary>
 546                 ///   If we already defined the ReturnLabel
 547                 /// </summary>
 548                 public bool HasReturnLabel;
 549
 550                 /// <summary>
 551                 ///  Whether we are inside an anonymous method.
 552                 /// </summary>
 553                 public AnonymousExpression CurrentAnonymousMethod;
 554
 555                 public IResolveContext ResolveContext;
 556
 557                 /// <summary>
 558                 ///    The current iterator
 559                 /// </summary>
 560                 public Iterator CurrentIterator {
 561                         get { return CurrentAnonymousMethod as Iterator; }
 562                 }
 563
 564                 public TypeInferenceContext ReturnTypeInference;
 565
 566                 public EmitContext (IResolveContext rc, ILGenerator ig, Type return_type)
 567                 {
 568                         this.ResolveContext = rc;
 569                         this.ig = ig;
 570
 571                         //
 572                         // The default setting comes from the command line option
 573                         //
 574                         if (RootContext.Checked)
 575                                 flags |= Options.CheckedScope;
 576
 577                         //
 578                         // The constant check state is always set to true
 579                         //
 580                         flags |= Options.ConstantCheckState;
 581
 582                         this.return_type = return_type;
 583                 }
 584
 585                 public virtual FlowBranching CurrentBranching {
 586                         get { return null; }
 587                 }
 588
 589                 public Type CurrentType {
 590                         get { return ResolveContext.CurrentType; }
 591                 }
 592
 593                 public TypeParameter[] CurrentTypeParameters {
 594                         get { return ResolveContext.CurrentTypeParameters; }
 595                 }
 596
 597                 public TypeContainer CurrentTypeDefinition {
 598                         get { return ResolveContext.CurrentTypeDefinition; }
 599                 }
 600
 601                 public bool ConstantCheckState {
 602                         get { return (flags & Options.ConstantCheckState) != 0; }
 603                 }
 604
 605                 public bool InUnsafe {
 606                         get { return HasSet (Options.UnsafeScope) || ResolveContext.IsInUnsafeScope; }
 607                 }
 608
 609                 public bool DoFlowAnalysis {
 610                         get { return (flags & Options.DoFlowAnalysis) != 0; }
 611                 }
 612
 613                 public bool OmitStructFlowAnalysis {
 614                         get { return (flags & Options.OmitStructFlowAnalysis) != 0; }
 615                 }
 616
 617                 public bool HasSet (Options options)
 618                 {
 619                         return (this.flags & options) == options;
 620                 }
 621
 622                 public bool HasAny (Options options)
 623                 {
 624                         return (this.flags & options) != 0;
 625                 }
 626
 627                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 628                 public FlagsHandle Set (Options options)
 629                 {
 630                         return new FlagsHandle (this, options);
 631                 }
 632
 633                 public FlagsHandle With (Options options, bool enable)
 634                 {
 635                         return new FlagsHandle (this, options, enable ? options : 0);
 636                 }
 637
 638                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 639                 {
 640                         Options newflags =
 641                                 (do_flow_analysis ? Options.DoFlowAnalysis : 0) |
 642                                 (omit_struct_analysis ? Options.OmitStructFlowAnalysis : 0);
 643                         return new FlagsHandle (this, Options.DoFlowAnalysis | Options.OmitStructFlowAnalysis, newflags);
 644                 }
 645
 646                 // IResolveContext.IsInObsoleteScope
 647                 public bool IsInObsoleteScope {
 648                         get {
 649                                 // Disables obsolete checks when probing is on
 650                                 return IsInProbingMode || ResolveContext.IsInObsoleteScope;
 651                         }
 652                 }
 653
 654                 public bool IsInProbingMode {
 655                         get { return (flags & Options.ProbingMode) != 0; }
 656                 }
 657
 658                 bool IResolveContext.IsInUnsafeScope {
 659                         get { return InUnsafe; }
 660                 }
 661
 662                 public bool IsStatic {
 663                         get { return ResolveContext.IsStatic; }
 664                 }
 665
 666                 public bool IsVariableCapturingRequired {
 667                         get {
 668                                 return !IsInProbingMode && (CurrentBranching == null || !CurrentBranching.CurrentUsageVector.IsUnreachable);
 669                         }
 670                 }
 671
 672                 public bool OmitDebuggingInfo {
 673                         get { return (flags & Options.OmitDebuggingInfo) != 0; }
 674                         set {
 675                                 if (value)
 676                                         flags |= Options.OmitDebuggingInfo;
 677                                 else
 678                                         flags &= ~Options.OmitDebuggingInfo;
 679                         }
 680                 }
 681
 682                 public bool MustCaptureVariable (LocalInfo local)
 683                 {
 684                         if (CurrentAnonymousMethod == null)
 685                                 return false;
 686
 687                         // FIXME: IsIterator is too aggressive, we should capture only if child
 688                         // block contains yield
 689                         if (CurrentAnonymousMethod.IsIterator)
 690                                 return true;
 691
 692                         return local.Block.Toplevel != CurrentBlock.Toplevel;
 693                 }
 694
 695                 public Type ReturnType {
 696                         get {
 697                                 return return_type;
 698                         }
 699                 }
 700
 701                 /// <summary>
 702                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 703                 ///   writer to which source line this opcode belongs.
 704                 /// </summary>
 705                 public void Mark (Location loc)
 706                 {
 707                         if (!SymbolWriter.HasSymbolWriter || OmitDebuggingInfo || loc.IsNull)
 708                                 return;
 709
 710                         SymbolWriter.MarkSequencePoint (ig, loc);
 711                 }
 712
 713                 public void DefineLocalVariable (string name, LocalBuilder builder)
 714                 {
 715                         SymbolWriter.DefineLocalVariable (name, builder);
 716                 }
 717
 718                 public void BeginScope ()
 719                 {
 720                         ig.BeginScope();
 721                         SymbolWriter.OpenScope(ig);
 722                 }
 723
 724                 public void EndScope ()
 725                 {
 726                         ig.EndScope();
 727                         SymbolWriter.CloseScope(ig);
 728                 }
 729
 730                 /// <summary>
 731                 ///   Returns a temporary storage for a variable of type t as
 732                 ///   a local variable in the current body.
 733                 /// </summary>
 734                 public LocalBuilder GetTemporaryLocal (Type t)
 735                 {
 736                         if (temporary_storage != null) {
 737                                 object o = temporary_storage [t];
 738                                 if (o != null) {
 739                                         if (o is Stack) {
 740                                                 Stack s = (Stack) o;
 741                                                 o = s.Count == 0 ? null : s.Pop ();
 742                                         } else {
 743                                                 temporary_storage.Remove (t);
 744                                         }
 745                                 }
 746                                 if (o != null)
 747                                         return (LocalBuilder) o;
 748                         }
 749                         return ig.DeclareLocal (t);
 750                 }
 751
 752                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 753                 {
 754                         if (temporary_storage == null) {
 755                                 temporary_storage = new Hashtable ();
 756                                 temporary_storage [t] = b;
 757                                 return;
 758                         }
 759                         object o = temporary_storage [t];
 760                         if (o == null) {
 761                                 temporary_storage [t] = b;
 762                                 return;
 763                         }
 764                         Stack s = o as Stack;
 765                         if (s == null) {
 766                                 s = new Stack ();
 767                                 s.Push (o);
 768                                 temporary_storage [t] = s;
 769                         }
 770                         s.Push (b);
 771                 }
 772
 773                 /// <summary>
 774                 ///   Current loop begin and end labels.
 775                 /// </summary>
 776                 public Label LoopBegin, LoopEnd;
 777
 778                 /// <summary>
 779                 ///   Default target in a switch statement.   Only valid if
 780                 ///   InSwitch is true
 781                 /// </summary>
 782                 public Label DefaultTarget;
 783
 784                 /// <summary>
 785                 ///   If this is non-null, points to the current switch statement
 786                 /// </summary>
 787                 public Switch Switch;
 788
 789                 /// <summary>
 790                 ///   ReturnValue creates on demand the LocalBuilder for the
 791                 ///   return value from the function.  By default this is not
 792                 ///   used.  This is only required when returns are found inside
 793                 ///   Try or Catch statements.
 794                 ///
 795                 ///   This method is typically invoked from the Emit phase, so
 796                 ///   we allow the creation of a return label if it was not
 797                 ///   requested during the resolution phase.   Could be cleaned
 798                 ///   up, but it would replicate a lot of logic in the Emit phase
 799                 ///   of the code that uses it.
 800                 /// </summary>
 801                 public LocalBuilder TemporaryReturn ()
 802                 {
 803                         if (return_value == null){
 804                                 return_value = ig.DeclareLocal (return_type);
 805                                 if (!HasReturnLabel){
 806                                         ReturnLabel = ig.DefineLabel ();
 807                                         HasReturnLabel = true;
 808                                 }
 809                         }
 810
 811                         return return_value;
 812                 }
 813
 814                 public Expression GetThis (Location loc)
 815                 {
 816                         This my_this;
 817                         if (CurrentBlock != null)
 818                                 my_this = new This (CurrentBlock, loc);
 819                         else
 820                                 my_this = new This (loc);
 821
 822                         if (!my_this.ResolveBase (this))
 823                                 my_this = null;
 824
 825                         return my_this;
 826                 }
 827
 828                 #region IResolveContext Members
 829
 830                 public ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
 831                 {
 832                         return ResolveContext.LookupExtensionMethod (extensionType, name, loc);
 833                 }
 834
 835                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
 836                 {
 837                         return ResolveContext.LookupNamespaceOrType (name, loc, ignore_cs0104);
 838                 }
 839
 840                 public FullNamedExpression LookupNamespaceAlias (string name)
 841                 {
 842                         return ResolveContext.LookupNamespaceAlias (name);
 843                 }
 844
 845                 #endregion
 846         }
 847
 848         public class ResolveContext : EmitContext
 849         {
 850                 public ResolveContext (IResolveContext mc)
 851                         : base (mc, null, null)
 852                 {
 853                 }
 854
 855                 public ResolveContext (IResolveContext mc, Options options)
 856                         : this (mc)
 857                 {
 858                         Set (options);
 859                 }
 860         }
 861
 862
 863         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext
 864         {
 865                 public void AddAttributes (ArrayList attrs, IResolveContext context)
 866                 {
 867                         foreach (Attribute a in attrs)
 868                                 a.AttachTo (this, context);
 869
 870                         if (attributes == null) {
 871                                 attributes = new Attributes (attrs);
 872                                 return;
 873                         }
 874                         attributes.AddAttributes (attrs);
 875                 }
 876
 877                 public virtual void Emit (TypeContainer tc)
 878                 {
 879                         if (OptAttributes == null)
 880                                 return;
 881
 882                         OptAttributes.Emit ();
 883                 }
 884
 885                 protected Attribute ResolveAttribute (PredefinedAttribute a_type)
 886                 {
 887                         Attribute a = OptAttributes.Search (a_type);
 888                         if (a != null) {
 889                                 a.Resolve ();
 890                         }
 891                         return a;
 892                 }
 893
 894                 #region IResolveContext Members
 895
 896                 public Type CurrentType {
 897                         get { return null; }
 898                 }
 899
 900                 public TypeParameter[] CurrentTypeParameters {
 901                         get { return null; }
 902                 }
 903
 904                 public TypeContainer CurrentTypeDefinition {
 905                         get { return RootContext.ToplevelTypes; }
 906                 }
 907
 908                 public DeclSpace DeclContainer {
 909                         get { return RootContext.ToplevelTypes; }
 910                 }
 911
 912                 public bool IsInObsoleteScope {
 913                         get { return false; }
 914                 }
 915
 916                 public bool IsInUnsafeScope {
 917                         get { return false; }
 918                 }
 919
 920                 public bool IsStatic {
 921                         get { return false; }
 922                 }
 923
 924                 public ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
 925                 {
 926                         throw new NotImplementedException ();
 927                 }
 928
 929                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
 930                 {
 931                         return RootContext.ToplevelTypes.LookupNamespaceOrType (name, loc, ignore_cs0104);
 932                 }
 933
 934                 public FullNamedExpression LookupNamespaceAlias (string name)
 935                 {
 936                         return null;
 937                 }
 938
 939                 #endregion
 940         }
 941
 942         public class AssemblyClass : CommonAssemblyModulClass {
 943                 // TODO: make it private and move all builder based methods here
 944                 public AssemblyBuilder Builder;
 945                 bool is_cls_compliant;
 946                 bool wrap_non_exception_throws;
 947
 948                 public Attribute ClsCompliantAttribute;
 949
 950                 ListDictionary declarative_security;
 951                 bool has_extension_method;
 952                 public AssemblyName Name;
 953                 MethodInfo add_type_forwarder;
 954                 ListDictionary emitted_forwarders;
 955
 956                 // Module is here just because of error messages
 957                 static string[] attribute_targets = new string [] { "assembly", "module" };
 958
 959                 public AssemblyClass (): base ()
 960                 {
 961                         wrap_non_exception_throws = true;
 962                 }
 963
 964                 public bool HasExtensionMethods {
 965                         set {
 966                                 has_extension_method = value;
 967                         }
 968                 }
 969
 970                 public bool IsClsCompliant {
 971                         get {
 972                                 return is_cls_compliant;
 973                         }
 974                 }
 975
 976                 public bool WrapNonExceptionThrows {
 977                         get {
 978                                 return wrap_non_exception_throws;
 979                         }
 980                 }
 981
 982                 public override AttributeTargets AttributeTargets {
 983                         get {
 984                                 return AttributeTargets.Assembly;
 985                         }
 986                 }
 987
 988                 public override bool IsClsComplianceRequired ()
 989                 {
 990                         return is_cls_compliant;
 991                 }
 992
 993                 public void Resolve ()
 994                 {
 995                         if (RootContext.Unsafe) {
 996                                 //
 997                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
 998                                 // when -unsafe option was specified
 999                                 //
1000
1001                                 Location loc = Location.Null;
1002
1003                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
1004                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
1005
1006                                 Arguments pos = new Arguments (1);
1007                                 pos.Add (new Argument (new MemberAccess (new MemberAccess (system_security_permissions, "SecurityAction", loc), "RequestMinimum")));
1008
1009                                 Arguments named = new Arguments (1);
1010                                 named.Add (new NamedArgument (new LocatedToken (loc, "SkipVerification"), (new BoolLiteral (true, loc))));
1011
1012                                 GlobalAttribute g = new GlobalAttribute (new NamespaceEntry (null, null, null), "assembly",
1013                                         new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
1014                                         new Arguments[] { pos, named }, loc, false);
1015                                 g.AttachTo (this, this);
1016
1017                                 if (g.Resolve () != null) {
1018                                         declarative_security = new ListDictionary ();
1019                                         g.ExtractSecurityPermissionSet (declarative_security);
1020                                 }
1021                         }
1022
1023                         if (OptAttributes == null)
1024                                 return;
1025
1026                         // Ensure that we only have GlobalAttributes, since the Search isn't safe with other types.
1027                         if (!OptAttributes.CheckTargets())
1028                                 return;
1029
1030                         ClsCompliantAttribute = ResolveAttribute (PredefinedAttributes.Get.CLSCompliant);
1031
1032                         if (ClsCompliantAttribute != null) {
1033                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1034                         }
1035
1036                         Attribute a = ResolveAttribute (PredefinedAttributes.Get.RuntimeCompatibility);
1037                         if (a != null) {
1038                                 object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1039                                 if (val != null)
1040                                         wrap_non_exception_throws = (bool) val;
1041                         }
1042                 }
1043
1044                 // fix bug #56621
1045                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1046                 {
1047                         try {
1048                                 // check for possible ECMA key
1049                                 if (strongNameBlob.Length == 16) {
1050                                         // will be rejected if not "the" ECMA key
1051                                         an.SetPublicKey (strongNameBlob);
1052                                 }
1053                                 else {
1054                                         // take it, with or without, a private key
1055                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1056                                         // and make sure we only feed the public part to Sys.Ref
1057                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1058
1059                                         // AssemblyName.SetPublicKey requires an additional header
1060                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1061
1062                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1063                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1064                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1065                                         an.SetPublicKey (encodedPublicKey);
1066                                 }
1067                         }
1068                         catch (Exception) {
1069                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1070                                 Environment.Exit (1);
1071                         }
1072                 }
1073
1074                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1075                 public AssemblyName GetAssemblyName (string name, string output)
1076                 {
1077                         if (OptAttributes != null) {
1078                                 foreach (Attribute a in OptAttributes.Attrs) {
1079                                         // cannot rely on any resolve-based members before you call Resolve
1080                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1081                                                 continue;
1082
1083                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1084                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1085                                         //       are loaded yet.
1086                                         // TODO: Does not handle quoted attributes properly
1087                                         switch (a.Name) {
1088                                         case "AssemblyKeyFile":
1089                                         case "AssemblyKeyFileAttribute":
1090                                         case "System.Reflection.AssemblyKeyFileAttribute":
1091                                                 if (RootContext.StrongNameKeyFile != null) {
1092                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
1093                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1094                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1095                                                 } else {
1096                                                         string value = a.GetString ();
1097                                                         if (value != null && value.Length != 0)
1098                                                                 RootContext.StrongNameKeyFile = value;
1099                                                 }
1100                                                 break;
1101                                         case "AssemblyKeyName":
1102                                         case "AssemblyKeyNameAttribute":
1103                                         case "System.Reflection.AssemblyKeyNameAttribute":
1104                                                 if (RootContext.StrongNameKeyContainer != null) {
1105                                                         Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
1106                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1107                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
1108                                                 } else {
1109                                                         string value = a.GetString ();
1110                                                         if (value != null && value.Length != 0)
1111                                                                 RootContext.StrongNameKeyContainer = value;
1112                                                 }
1113                                                 break;
1114                                         case "AssemblyDelaySign":
1115                                         case "AssemblyDelaySignAttribute":
1116                                         case "System.Reflection.AssemblyDelaySignAttribute":
1117                                                 RootContext.StrongNameDelaySign = a.GetBoolean ();
1118                                                 break;
1119                                         }
1120                                 }
1121                         }
1122
1123                         AssemblyName an = new AssemblyName ();
1124                         an.Name = Path.GetFileNameWithoutExtension (name);
1125
1126                         // note: delay doesn't apply when using a key container
1127                         if (RootContext.StrongNameKeyContainer != null) {
1128                                 an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
1129                                 return an;
1130                         }
1131
1132                         // strongname is optional
1133                         if (RootContext.StrongNameKeyFile == null)
1134                                 return an;
1135
1136                         string AssemblyDir = Path.GetDirectoryName (output);
1137
1138                         // the StrongName key file may be relative to (a) the compiled
1139                         // file or (b) to the output assembly. See bugzilla #55320
1140                         // http://bugzilla.ximian.com/show_bug.cgi?id=55320
1141
1142                         // (a) relative to the compiled file
1143                         string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
1144                         bool exist = File.Exists (filename);
1145                         if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
1146                                 // (b) relative to the outputed assembly
1147                                 filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
1148                                 exist = File.Exists (filename);
1149                         }
1150
1151                         if (exist) {
1152                                 using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
1153                                         byte[] snkeypair = new byte [fs.Length];
1154                                         fs.Read (snkeypair, 0, snkeypair.Length);
1155
1156                                         if (RootContext.StrongNameDelaySign) {
1157                                                 // delayed signing - DO NOT include private key
1158                                                 SetPublicKey (an, snkeypair);
1159                                         }
1160                                         else {
1161                                                 // no delay so we make sure we have the private key
1162                                                 try {
1163                                                         CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
1164                                                         an.KeyPair = new StrongNameKeyPair (snkeypair);
1165                                                 }
1166                                                 catch (CryptographicException) {
1167                                                         if (snkeypair.Length == 16) {
1168                                                                 // error # is different for ECMA key
1169                                                                 Report.Error (1606, "Could not sign the assembly. " +
1170                                                                         "ECMA key can only be used to delay-sign assemblies");
1171                                                         }
1172                                                         else {
1173                                                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
1174                                                         }
1175                                                         return null;
1176                                                 }
1177                                         }
1178                                 }
1179                         }
1180                         else {
1181                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' does not exist");
1182                                 return null;
1183                         }
1184                         return an;
1185                 }
1186
1187                 void Error_AssemblySigning (string text)
1188                 {
1189                         Report.Error (1548, "Error during assembly signing. " + text);
1190                 }
1191
1192                 bool CheckInternalsVisibleAttribute (Attribute a)
1193                 {
1194                         string assembly_name = a.GetString ();
1195                         if (assembly_name.Length == 0)
1196                                 return false;
1197
1198                         AssemblyName aname = null;
1199                         try {
1200 #if GMCS_SOURCE
1201                                 aname = new AssemblyName (assembly_name);
1202 #else
1203                                 throw new NotSupportedException ();
1204 #endif
1205                         } catch (FileLoadException) {
1206                         } catch (ArgumentException) {
1207                         }
1208
1209                         // Bad assembly name format
1210                         if (aname == null)
1211                                 Report.Warning (1700, 3, a.Location, "Assembly reference `" + assembly_name + "' is invalid and cannot be resolved");
1212                         // Report error if we have defined Version or Culture
1213                         else if (aname.Version != null || aname.CultureInfo != null)
1214                                 throw new Exception ("Friend assembly `" + a.GetString () +
1215                                                 "' is invalid. InternalsVisibleTo cannot have version or culture specified.");
1216                         else if (aname.GetPublicKey () == null && Name.GetPublicKey () != null && Name.GetPublicKey ().Length != 0) {
1217                                 Report.Error (1726, a.Location, "Friend assembly reference `" + aname.FullName + "' is invalid." +
1218                                                 " Strong named assemblies must specify a public key in their InternalsVisibleTo declarations");
1219                                 return false;
1220                         }
1221
1222                         return true;
1223                 }
1224
1225                 static bool IsValidAssemblyVersion (string version)
1226                 {
1227                         Version v;
1228                         try {
1229                                 v = new Version (version);
1230                         } catch {
1231                                 try {
1232                                         int major = int.Parse (version, CultureInfo.InvariantCulture);
1233                                         v = new Version (major, 0);
1234                                 } catch {
1235                                         return false;
1236                                 }
1237                         }
1238
1239                         foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
1240                                 if (candidate > ushort.MaxValue)
1241                                         return false;
1242                         }
1243
1244                         return true;
1245                 }
1246
1247                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
1248                 {
1249                         if (a.IsValidSecurityAttribute ()) {
1250                                 if (declarative_security == null)
1251                                         declarative_security = new ListDictionary ();
1252
1253                                 a.ExtractSecurityPermissionSet (declarative_security);
1254                                 return;
1255                         }
1256
1257                         if (a.Type == pa.AssemblyCulture) {
1258                                 string value = a.GetString ();
1259                                 if (value == null || value.Length == 0)
1260                                         return;
1261
1262                                 if (RootContext.Target == Target.Exe) {
1263                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1264                                         return;
1265                                 }
1266                         }
1267
1268                         if (a.Type == pa.AssemblyVersion) {
1269                                 string value = a.GetString ();
1270                                 if (value == null || value.Length == 0)
1271                                         return;
1272
1273                                 value = value.Replace ('*', '0');
1274
1275                                 if (!IsValidAssemblyVersion (value)) {
1276                                         a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
1277                                         return;
1278                                 }
1279                         }
1280
1281                         if (a.Type == pa.InternalsVisibleTo && !CheckInternalsVisibleAttribute (a))
1282                                 return;
1283
1284                         if (a.Type == pa.TypeForwarder) {
1285                                 Type t = a.GetArgumentType ();
1286                                 if (t == null || TypeManager.HasElementType (t)) {
1287                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1288                                         return;
1289                                 }
1290
1291                                 t = TypeManager.DropGenericTypeArguments (t);
1292                                 if (emitted_forwarders == null) {
1293                                         emitted_forwarders = new ListDictionary();
1294                                 } else if (emitted_forwarders.Contains(t)) {
1295                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
1296                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
1297                                                 TypeManager.CSharpName(t));
1298                                         return;
1299                                 }
1300
1301                                 emitted_forwarders.Add(t, a);
1302
1303                                 if (TypeManager.LookupDeclSpace (t) != null) {
1304                                         Report.SymbolRelatedToPreviousError (t);
1305                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1306                                                 TypeManager.CSharpName (t));
1307                                         return;
1308                                 }
1309
1310                                 if (t.DeclaringType != null) {
1311                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1312                                                 TypeManager.CSharpName (t));
1313                                         return;
1314                                 }
1315
1316                                 if (add_type_forwarder == null) {
1317                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1318                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1319
1320                                         if (add_type_forwarder == null) {
1321                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1322                                                 return;
1323                                         }
1324                                 }
1325
1326                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1327                                 return;
1328                         }
1329
1330                         if (a.Type == pa.Extension) {
1331                                 a.Error_MisusedExtensionAttribute ();
1332                                 return;
1333                         }
1334
1335                         Builder.SetCustomAttribute (cb);
1336                 }
1337
1338                 public override void Emit (TypeContainer tc)
1339                 {
1340                         base.Emit (tc);
1341
1342                         if (has_extension_method)
1343                                 PredefinedAttributes.Get.Extension.EmitAttribute (Builder);
1344
1345                         // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1346                         PredefinedAttribute pa = PredefinedAttributes.Get.RuntimeCompatibility;
1347                         if (pa.IsDefined && (OptAttributes == null || !OptAttributes.Contains (pa))) {
1348                                 ConstructorInfo ci = TypeManager.GetPredefinedConstructor (
1349                                         pa.Type, Location.Null, Type.EmptyTypes);
1350                                 PropertyInfo [] pis = new PropertyInfo [1];
1351                                 pis [0] = TypeManager.GetPredefinedProperty (pa.Type,
1352                                         "WrapNonExceptionThrows", Location.Null, TypeManager.bool_type);
1353                                 object [] pargs = new object [1];
1354                                 pargs [0] = true;
1355                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1356                         }
1357
1358                         if (declarative_security != null) {
1359
1360                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1361                                 object builder_instance = Builder;
1362
1363                                 try {
1364                                         // Microsoft runtime hacking
1365                                         if (add_permission == null) {
1366                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1367                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1368
1369                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1370                                                 builder_instance = fi.GetValue (Builder);
1371                                         }
1372
1373                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1374                                                                                                   declarative_security [SecurityAction.RequestOptional],
1375                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1376                                         add_permission.Invoke (builder_instance, args);
1377                                 }
1378                                 catch {
1379                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1380                                 }
1381                         }
1382                 }
1383
1384                 public override string[] ValidAttributeTargets {
1385                         get {
1386                                 return attribute_targets;
1387                         }
1388                 }
1389
1390                 // Wrapper for AssemblyBuilder.AddModule
1391                 static MethodInfo adder_method;
1392                 static public MethodInfo AddModule_Method {
1393                         get {
1394                                 if (adder_method == null)
1395                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
1396                                 return adder_method;
1397                         }
1398                 }
1399                 public Module AddModule (string module)
1400                 {
1401                         MethodInfo m = AddModule_Method;
1402                         if (m == null) {
1403                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
1404                                 Environment.Exit (1);
1405                         }
1406
1407                         try {
1408                                 return (Module) m.Invoke (Builder, new object [] { module });
1409                         } catch (TargetInvocationException ex) {
1410                                 throw ex.InnerException;
1411                         }
1412                 }
1413         }
1414 }