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                 public static ModuleClass Module;
  44
  45                 static CodeGen ()
  46                 {
  47                         Reset ();
  48                 }
  49
  50                 public static void Reset ()
  51                 {
  52                         Assembly = new AssemblyClass ();
  53                         Module = new ModuleClass (RootContext.Unsafe);
  54                 }
  55
  56                 public static string Basename (string name)
  57                 {
  58                         int pos = name.LastIndexOf ('/');
  59
  60                         if (pos != -1)
  61                                 return name.Substring (pos + 1);
  62
  63                         pos = name.LastIndexOf ('\\');
  64                         if (pos != -1)
  65                                 return name.Substring (pos + 1);
  66
  67                         return name;
  68                 }
  69
  70                 public static string Dirname (string name)
  71                 {
  72                         int pos = name.LastIndexOf ('/');
  73
  74                         if (pos != -1)
  75                                 return name.Substring (0, pos);
  76
  77                         pos = name.LastIndexOf ('\\');
  78                         if (pos != -1)
  79                                 return name.Substring (0, pos);
  80
  81                         return ".";
  82                 }
  83
  84                 static public string FileName;
  85
  86 #if MS_COMPATIBLE
  87                 const AssemblyBuilderAccess COMPILER_ACCESS = 0;
  88 #else
  89                 /* Keep this in sync with System.Reflection.Emit.AssemblyBuilder */
  90                 const AssemblyBuilderAccess COMPILER_ACCESS = (AssemblyBuilderAccess) 0x800;
  91 #endif
  92
  93                 //
  94                 // Initializes the code generator variables for interactive use (repl)
  95                 //
  96                 static public void InitDynamic (string name)
  97                 {
  98                         current_domain = AppDomain.CurrentDomain;
  99                         AssemblyName an = Assembly.GetAssemblyName (name, name);
 100
 101                         Assembly.Builder = current_domain.DefineDynamicAssembly (an, AssemblyBuilderAccess.Run | COMPILER_ACCESS);
 102                         Module.Builder = Assembly.Builder.DefineDynamicModule (Basename (name), false);
 103 #if GMCS_SOURCE
 104                         Assembly.Name = Assembly.Builder.GetName ();
 105 #endif
 106                 }
 107
 108                 //
 109                 // Initializes the code generator variables
 110                 //
 111                 static public bool Init (string name, string output, bool want_debugging_support)
 112                 {
 113                         FileName = output;
 114                         AssemblyName an = Assembly.GetAssemblyName (name, output);
 115                         if (an == null)
 116                                 return false;
 117
 118                         if (an.KeyPair != null) {
 119                                 // If we are going to strong name our assembly make
 120                                 // sure all its refs are strong named
 121                                 foreach (Assembly a in RootNamespace.Global.Assemblies) {
 122                                         AssemblyName ref_name = a.GetName ();
 123                                         byte [] b = ref_name.GetPublicKeyToken ();
 124                                         if (b == null || b.Length == 0) {
 125                                                 Report.Error (1577, "Assembly generation failed " +
 126                                                                 "-- Referenced assembly '" +
 127                                                                 ref_name.Name +
 128                                                                 "' does not have a strong name.");
 129                                                 //Environment.Exit (1);
 130                                         }
 131                                 }
 132                         }
 133
 134                         current_domain = AppDomain.CurrentDomain;
 135
 136                         try {
 137                                 Assembly.Builder = current_domain.DefineDynamicAssembly (an,
 138                                         AssemblyBuilderAccess.RunAndSave | COMPILER_ACCESS, Dirname (name));
 139                         }
 140                         catch (ArgumentException) {
 141                                 // specified key may not be exportable outside it's container
 142                                 if (RootContext.StrongNameKeyContainer != null) {
 143                                         Report.Error (1548, "Could not access the key inside the container `" +
 144                                                 RootContext.StrongNameKeyContainer + "'.");
 145                                         Environment.Exit (1);
 146                                 }
 147                                 throw;
 148                         }
 149                         catch (CryptographicException) {
 150                                 if ((RootContext.StrongNameKeyContainer != null) || (RootContext.StrongNameKeyFile != null)) {
 151                                         Report.Error (1548, "Could not use the specified key to strongname the assembly.");
 152                                         Environment.Exit (1);
 153                                 }
 154                                 return false;
 155                         }
 156
 157 #if GMCS_SOURCE
 158                         // Get the complete AssemblyName from the builder
 159                         // (We need to get the public key and token)
 160                         Assembly.Name = Assembly.Builder.GetName ();
 161 #endif
 162
 163                         //
 164                         // Pass a path-less name to DefineDynamicModule.  Wonder how
 165                         // this copes with output in different directories then.
 166                         // FIXME: figure out how this copes with --output /tmp/blah
 167                         //
 168                         // If the third argument is true, the ModuleBuilder will dynamically
 169                         // load the default symbol writer.
 170                         //
 171                         try {
 172                                 Module.Builder = Assembly.Builder.DefineDynamicModule (
 173                                         Basename (name), Basename (output), want_debugging_support);
 174
 175 #if !MS_COMPATIBLE
 176                                 // TODO: We should use SymbolWriter from DefineDynamicModule
 177                                 if (want_debugging_support && !SymbolWriter.Initialize (Module.Builder, output)) {
 178                                         Report.Error (40, "Unexpected debug information initialization error `{0}'",
 179                                                 "Could not find the symbol writer assembly (Mono.CompilerServices.SymbolWriter.dll)");
 180                                         return false;
 181                                 }
 182 #endif
 183                         } catch (ExecutionEngineException e) {
 184                                 Report.Error (40, "Unexpected debug information initialization error `{0}'",
 185                                         e.Message);
 186                                 return false;
 187                         }
 188
 189                         return true;
 190                 }
 191
 192                 static public void Save (string name, bool saveDebugInfo)
 193                 {
 194                         try {
 195                                 Assembly.Builder.Save (Basename (name));
 196                         }
 197                         catch (COMException) {
 198                                 if ((RootContext.StrongNameKeyFile == null) || (!RootContext.StrongNameDelaySign))
 199                                         throw;
 200
 201                                 // FIXME: it seems Microsoft AssemblyBuilder doesn't like to delay sign assemblies
 202                                 Report.Error (1548, "Couldn't delay-sign the assembly with the '" +
 203                                         RootContext.StrongNameKeyFile +
 204                                         "', Use MCS with the Mono runtime or CSC to compile this assembly.");
 205                         }
 206                         catch (System.IO.IOException io) {
 207                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + io.Message);
 208                                 return;
 209                         }
 210                         catch (System.UnauthorizedAccessException ua) {
 211                                 Report.Error (16, "Could not write to file `"+name+"', cause: " + ua.Message);
 212                                 return;
 213                         }
 214
 215                         //
 216                         // Write debuger symbol file
 217                         //
 218                         if (saveDebugInfo)
 219                                 SymbolWriter.WriteSymbolFile ();
 220                         }
 221         }
 222
 223
 224         /// <summary>
 225         /// An interface to hold all the information needed in the resolving phase.
 226         /// </summary>
 227         public interface IResolveContext
 228         {
 229                 DeclSpace DeclContainer { get; }
 230                 bool IsInObsoleteScope { get; }
 231                 bool IsInUnsafeScope { get; }
 232
 233                 // the declcontainer to lookup for type-parameters.  Should only use LookupGeneric on it.
 234                 //
 235                 // FIXME: This is somewhat of a hack.  We don't need a full DeclSpace for this.  We just need the
 236                 //        current type parameters in scope. IUIC, that will require us to rewrite GenericMethod.
 237                 //        Maybe we can replace this with a 'LookupGeneric (string)' instead, but we'll have to
 238                 //        handle generic method overrides differently
 239                 DeclSpace GenericDeclContainer { get; }
 240         }
 241
 242         /// <summary>
 243         ///   An Emit Context is created for each body of code (from methods,
 244         ///   properties bodies, indexer bodies or constructor bodies)
 245         /// </summary>
 246         public class EmitContext : IResolveContext {
 247
 248                 //
 249                 // Holds a varible used during collection or object initialization.
 250                 //
 251                 public Expression CurrentInitializerVariable;
 252
 253                 DeclSpace decl_space;
 254
 255                 public DeclSpace TypeContainer;
 256                 public ILGenerator ig;
 257
 258                 [Flags]
 259                 public enum Flags : int {
 260                         /// <summary>
 261                         ///   This flag tracks the `checked' state of the compilation,
 262                         ///   it controls whether we should generate code that does overflow
 263                         ///   checking, or if we generate code that ignores overflows.
 264                         ///
 265                         ///   The default setting comes from the command line option to generate
 266                         ///   checked or unchecked code plus any source code changes using the
 267                         ///   checked/unchecked statements or expressions.   Contrast this with
 268                         ///   the ConstantCheckState flag.
 269                         /// </summary>
 270                         CheckState = 1 << 0,
 271
 272                         /// <summary>
 273                         ///   The constant check state is always set to `true' and cant be changed
 274                         ///   from the command line.  The source code can change this setting with
 275                         ///   the `checked' and `unchecked' statements and expressions.
 276                         /// </summary>
 277                         ConstantCheckState = 1 << 1,
 278
 279                         AllCheckStateFlags = CheckState | ConstantCheckState,
 280
 281                         /// <summary>
 282                         ///  Whether we are inside an unsafe block
 283                         /// </summary>
 284                         InUnsafe = 1 << 2,
 285
 286                         InCatch = 1 << 3,
 287                         InFinally = 1 << 4,
 288
 289                         /// <summary>
 290                         ///   Whether control flow analysis is enabled
 291                         /// </summary>
 292                         DoFlowAnalysis = 1 << 5,
 293
 294                         /// <summary>
 295                         ///   Whether control flow analysis is disabled on structs
 296                         ///   (only meaningful when DoFlowAnalysis is set)
 297                         /// </summary>
 298                         OmitStructFlowAnalysis = 1 << 6,
 299
 300                         ///
 301                         /// Indicates the current context is in probing mode, no errors are reported.
 302                         ///
 303                         ProbingMode = 1 <<      7,
 304
 305                         //
 306                         // Inside field intializer expression
 307                         //
 308                         InFieldInitializer = 1 << 8,
 309
 310                         InferReturnType = 1 << 9,
 311
 312                         InCompoundAssignment = 1 << 10,
 313
 314                         OmitDebuggingInfo = 1 << 11
 315                 }
 316
 317                 Flags flags;
 318
 319                 /// <summary>
 320                 ///   Whether we are emitting code inside a static or instance method
 321                 /// </summary>
 322                 public bool IsStatic;
 323
 324                 /// <summary>
 325                 ///   Whether the actual created method is static or instance method.
 326                 ///   Althoug the method might be declared as `static', if an anonymous
 327                 ///   method is involved, we might turn this into an instance method.
 328                 ///
 329                 ///   So this reflects the low-level staticness of the method, while
 330                 ///   IsStatic represents the semantic, high-level staticness.
 331                 /// </summary>
 332                 //public bool MethodIsStatic;
 333
 334                 /// <summary>
 335                 ///   The value that is allowed to be returned or NULL if there is no
 336                 ///   return type.
 337                 /// </summary>
 338                 Type return_type;
 339
 340                 /// <summary>
 341                 ///   Points to the Type (extracted from the TypeContainer) that
 342                 ///   declares this body of code
 343                 /// </summary>
 344                 public readonly Type ContainerType;
 345
 346                 /// <summary>
 347                 ///   Whether this is generating code for a constructor
 348                 /// </summary>
 349                 public bool IsConstructor;
 350
 351                 /// <summary>
 352                 ///   Keeps track of the Type to LocalBuilder temporary storage created
 353                 ///   to store structures (used to compute the address of the structure
 354                 ///   value on structure method invocations)
 355                 /// </summary>
 356                 public Hashtable temporary_storage;
 357
 358                 public Block CurrentBlock;
 359
 360                 public int CurrentFile;
 361
 362                 /// <summary>
 363                 ///   The location where we store the return value.
 364                 /// </summary>
 365                 LocalBuilder return_value;
 366
 367                 /// <summary>
 368                 ///   The location where return has to jump to return the
 369                 ///   value
 370                 /// </summary>
 371                 public Label ReturnLabel;
 372
 373                 /// <summary>
 374                 ///   If we already defined the ReturnLabel
 375                 /// </summary>
 376                 public bool HasReturnLabel;
 377
 378                 /// <summary>
 379                 ///  Whether we are in a `fixed' initialization
 380                 /// </summary>
 381                 public bool InFixedInitializer;
 382
 383                 /// <summary>
 384                 ///  Whether we are inside an anonymous method.
 385                 /// </summary>
 386                 public AnonymousExpression CurrentAnonymousMethod;
 387
 388                 /// <summary>
 389                 ///   Location for this EmitContext
 390                 /// </summary>
 391                 public Location loc;
 392
 393                 /// <summary>
 394                 ///   Inside an enum definition, we do not resolve enumeration values
 395                 ///   to their enumerations, but rather to the underlying type/value
 396                 ///   This is so EnumVal + EnumValB can be evaluated.
 397                 ///
 398                 ///   There is no "E operator + (E x, E y)", so during an enum evaluation
 399                 ///   we relax the rules
 400                 /// </summary>
 401                 public bool InEnumContext;
 402
 403                 public readonly IResolveContext ResolveContext;
 404
 405                 /// <summary>
 406                 ///    The current iterator
 407                 /// </summary>
 408                 public Iterator CurrentIterator {
 409                         get { return CurrentAnonymousMethod as Iterator; }
 410                 }
 411
 412                 /// <summary>
 413                 ///    Whether we are in the resolving stage or not
 414                 /// </summary>
 415                 enum Phase {
 416                         Created,
 417                         Resolving,
 418                         Emitting
 419                 }
 420
 421                 bool isAnonymousMethodAllowed = true;
 422
 423                 Phase current_phase;
 424                 FlowBranching current_flow_branching;
 425
 426                 static int next_id = 0;
 427                 int id = ++next_id;
 428
 429                 public override string ToString ()
 430                 {
 431                         return String.Format ("EmitContext ({0}:{1})", id,
 432                                               CurrentAnonymousMethod, loc);
 433                 }
 434
 435                 public EmitContext (IResolveContext rc, DeclSpace parent, DeclSpace ds, Location l, ILGenerator ig,
 436                                     Type return_type, int code_flags, bool is_constructor)
 437                 {
 438                         this.ResolveContext = rc;
 439                         this.ig = ig;
 440
 441                         TypeContainer = parent;
 442                         this.decl_space = ds;
 443                         if (RootContext.Checked)
 444                                 flags |= Flags.CheckState;
 445                         flags |= Flags.ConstantCheckState;
 446
 447                         if (return_type == null)
 448                                 throw new ArgumentNullException ("return_type");
 449 #if GMCS_SOURCE
 450                         if ((return_type is TypeBuilder) && return_type.IsGenericTypeDefinition)
 451                                 throw new InternalErrorException ();
 452 #endif
 453
 454                         IsStatic = (code_flags & Modifiers.STATIC) != 0;
 455                         ReturnType = return_type;
 456                         IsConstructor = is_constructor;
 457                         CurrentBlock = null;
 458                         CurrentFile = 0;
 459                         current_phase = Phase.Created;
 460
 461                         if (parent != null){
 462                                 // Can only be null for the ResolveType contexts.
 463                                 ContainerType = parent.TypeBuilder;
 464                                 if (rc.IsInUnsafeScope)
 465                                         flags |= Flags.InUnsafe;
 466                         }
 467                         loc = l;
 468                 }
 469
 470                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 471                                     Type return_type, int code_flags, bool is_constructor)
 472                         : this (rc, ds, ds, l, ig, return_type, code_flags, is_constructor)
 473                 {
 474                 }
 475
 476                 public EmitContext (IResolveContext rc, DeclSpace ds, Location l, ILGenerator ig,
 477                                     Type return_type, int code_flags)
 478                         : this (rc, ds, ds, l, ig, return_type, code_flags, false)
 479                 {
 480                 }
 481
 482                 // IResolveContext.DeclContainer
 483                 public DeclSpace DeclContainer {
 484                         get { return decl_space; }
 485                         set { decl_space = value; }
 486                 }
 487
 488                 // IResolveContext.GenericDeclContainer
 489                 public DeclSpace GenericDeclContainer {
 490                         get { return DeclContainer; }
 491                 }
 492
 493                 public bool CheckState {
 494                         get { return (flags & Flags.CheckState) != 0; }
 495                 }
 496
 497                 public bool ConstantCheckState {
 498                         get { return (flags & Flags.ConstantCheckState) != 0; }
 499                 }
 500
 501                 public bool InUnsafe {
 502                         get { return (flags & Flags.InUnsafe) != 0; }
 503                 }
 504
 505                 public bool InCatch {
 506                         get { return (flags & Flags.InCatch) != 0; }
 507                 }
 508
 509                 public bool InFinally {
 510                         get { return (flags & Flags.InFinally) != 0; }
 511                 }
 512
 513                 public bool DoFlowAnalysis {
 514                         get { return (flags & Flags.DoFlowAnalysis) != 0; }
 515                 }
 516
 517                 public bool OmitStructFlowAnalysis {
 518                         get { return (flags & Flags.OmitStructFlowAnalysis) != 0; }
 519                 }
 520
 521                 // utility helper for CheckExpr, UnCheckExpr, Checked and Unchecked statements
 522                 // it's public so that we can use a struct at the callsite
 523                 public struct FlagsHandle : IDisposable
 524                 {
 525                         EmitContext ec;
 526                         readonly Flags invmask, oldval;
 527
 528                         public FlagsHandle (EmitContext ec, Flags flagsToSet)
 529                                 : this (ec, flagsToSet, flagsToSet)
 530                         {
 531                         }
 532
 533                         internal FlagsHandle (EmitContext ec, Flags mask, Flags val)
 534                         {
 535                                 this.ec = ec;
 536                                 invmask = ~mask;
 537                                 oldval = ec.flags & mask;
 538                                 ec.flags = (ec.flags & invmask) | (val & mask);
 539
 540                                 if ((mask & Flags.ProbingMode) != 0)
 541                                         Report.DisableReporting ();
 542                         }
 543
 544                         public void Dispose ()
 545                         {
 546                                 if ((invmask & Flags.ProbingMode) == 0)
 547                                         Report.EnableReporting ();
 548
 549                                 ec.flags = (ec.flags & invmask) | oldval;
 550                         }
 551                 }
 552
 553                 // Temporarily set all the given flags to the given value.  Should be used in an 'using' statement
 554                 public FlagsHandle Set (Flags flagsToSet)
 555                 {
 556                         return new FlagsHandle (this, flagsToSet);
 557                 }
 558
 559                 public FlagsHandle With (Flags bits, bool enable)
 560                 {
 561                         return new FlagsHandle (this, bits, enable ? bits : 0);
 562                 }
 563
 564                 public FlagsHandle WithFlowAnalysis (bool do_flow_analysis, bool omit_struct_analysis)
 565                 {
 566                         Flags newflags =
 567                                 (do_flow_analysis ? Flags.DoFlowAnalysis : 0) |
 568                                 (omit_struct_analysis ? Flags.OmitStructFlowAnalysis : 0);
 569                         return new FlagsHandle (this, Flags.DoFlowAnalysis | Flags.OmitStructFlowAnalysis, newflags);
 570                 }
 571
 572                 /// <summary>
 573                 ///   If this is true, then Return and ContextualReturn statements
 574                 ///   will set the ReturnType value based on the expression types
 575                 ///   of each return statement instead of the method return type
 576                 ///   (which is initially null).
 577                 /// </summary>
 578                 public bool InferReturnType {
 579                         get { return (flags & Flags.InferReturnType) != 0; }
 580                 }
 581
 582                 // IResolveContext.IsInObsoleteScope
 583                 public bool IsInObsoleteScope {
 584                         get {
 585                                 // Disables obsolete checks when probing is on
 586                                 return IsInProbingMode || ResolveContext.IsInObsoleteScope;
 587                         }
 588                 }
 589
 590                 public bool IsInProbingMode {
 591                         get { return (flags & Flags.ProbingMode) != 0; }
 592                 }
 593
 594                 // IResolveContext.IsInUnsafeScope
 595                 public bool IsInUnsafeScope {
 596                         get { return InUnsafe || ResolveContext.IsInUnsafeScope; }
 597                 }
 598
 599                 public bool IsAnonymousMethodAllowed {
 600                         get { return isAnonymousMethodAllowed; }
 601                         set { isAnonymousMethodAllowed = value; }
 602                 }
 603
 604                 public bool IsInFieldInitializer {
 605                         get { return (flags & Flags.InFieldInitializer) != 0; }
 606                 }
 607
 608                 public bool IsInCompoundAssignment {
 609                         get { return (flags & Flags.InCompoundAssignment) != 0; }
 610                 }
 611
 612                 public bool IsVariableCapturingRequired {
 613                         get {
 614                                 return !IsInProbingMode && (CurrentBranching == null || !CurrentBranching.CurrentUsageVector.IsUnreachable);
 615                         }
 616                 }
 617
 618                 public FlowBranching CurrentBranching {
 619                         get { return current_flow_branching; }
 620                 }
 621
 622                 public bool OmitDebuggingInfo {
 623                         get { return (flags & Flags.OmitDebuggingInfo) != 0; }
 624                         set {
 625                                 if (value)
 626                                         flags |= Flags.OmitDebuggingInfo;
 627                                 else
 628                                         flags &= ~Flags.OmitDebuggingInfo;
 629                         }
 630                 }
 631
 632                 // <summary>
 633                 //   Starts a new code branching.  This inherits the state of all local
 634                 //   variables and parameters from the current branching.
 635                 // </summary>
 636                 public FlowBranching StartFlowBranching (FlowBranching.BranchingType type, Location loc)
 637                 {
 638                         current_flow_branching = FlowBranching.CreateBranching (CurrentBranching, type, null, loc);
 639                         return current_flow_branching;
 640                 }
 641
 642                 // <summary>
 643                 //   Starts a new code branching for block `block'.
 644                 // </summary>
 645                 public FlowBranching StartFlowBranching (Block block)
 646                 {
 647                         flags |= Flags.DoFlowAnalysis;
 648
 649                         current_flow_branching = FlowBranching.CreateBranching (
 650                                 CurrentBranching, FlowBranching.BranchingType.Block, block, block.StartLocation);
 651                         return current_flow_branching;
 652                 }
 653
 654                 public FlowBranchingTryCatch StartFlowBranching (TryCatch stmt)
 655                 {
 656                         FlowBranchingTryCatch branching = new FlowBranchingTryCatch (CurrentBranching, stmt);
 657                         current_flow_branching = branching;
 658                         return branching;
 659                 }
 660
 661                 public FlowBranchingException StartFlowBranching (ExceptionStatement stmt)
 662                 {
 663                         FlowBranchingException branching = new FlowBranchingException (CurrentBranching, stmt);
 664                         current_flow_branching = branching;
 665                         return branching;
 666                 }
 667
 668                 public FlowBranchingLabeled StartFlowBranching (LabeledStatement stmt)
 669                 {
 670                         FlowBranchingLabeled branching = new FlowBranchingLabeled (CurrentBranching, stmt);
 671                         current_flow_branching = branching;
 672                         return branching;
 673                 }
 674
 675                 public FlowBranchingIterator StartFlowBranching (Iterator iterator)
 676                 {
 677                         FlowBranchingIterator branching = new FlowBranchingIterator (CurrentBranching, iterator);
 678                         current_flow_branching = branching;
 679                         return branching;
 680                 }
 681
 682                 public FlowBranchingToplevel StartFlowBranching (ToplevelBlock stmt)
 683                 {
 684                         FlowBranchingToplevel branching = new FlowBranchingToplevel (CurrentBranching, stmt);
 685                         current_flow_branching = branching;
 686                         return branching;
 687                 }
 688
 689                 // <summary>
 690                 //   Ends a code branching.  Merges the state of locals and parameters
 691                 //   from all the children of the ending branching.
 692                 // </summary>
 693                 public bool EndFlowBranching ()
 694                 {
 695                         FlowBranching old = current_flow_branching;
 696                         current_flow_branching = current_flow_branching.Parent;
 697
 698                         FlowBranching.UsageVector vector = current_flow_branching.MergeChild (old);
 699                         return vector.IsUnreachable;
 700                 }
 701
 702                 // <summary>
 703                 //   Kills the current code branching.  This throws away any changed state
 704                 //   information and should only be used in case of an error.
 705                 // </summary>
 706                 // FIXME: this is evil
 707                 public void KillFlowBranching ()
 708                 {
 709                         current_flow_branching = current_flow_branching.Parent;
 710                 }
 711
 712                 public bool MustCaptureVariable (LocalInfo local)
 713                 {
 714                         if (CurrentAnonymousMethod == null)
 715                                 return false;
 716
 717                         // FIXME: IsIterator is too aggressive, we should capture only if child
 718                         // block contains yield
 719                         if (CurrentAnonymousMethod.IsIterator)
 720                                 return true;
 721
 722                         return local.Block.Toplevel != CurrentBlock.Toplevel;
 723                 }
 724
 725                 public void EmitMeta (ToplevelBlock b)
 726                 {
 727                         b.EmitMeta (this);
 728
 729                         if (HasReturnLabel)
 730                                 ReturnLabel = ig.DefineLabel ();
 731                 }
 732
 733                 //
 734                 // Here until we can fix the problem with Mono.CSharp.Switch, which
 735                 // currently can not cope with ig == null during resolve (which must
 736                 // be fixed for switch statements to work on anonymous methods).
 737                 //
 738                 public void EmitTopBlock (IMethodData md, ToplevelBlock block)
 739                 {
 740                         if (block == null)
 741                                 return;
 742
 743                         bool unreachable;
 744
 745                         if (ResolveTopBlock (null, block, md.ParameterInfo, md, out unreachable)){
 746                                 if (Report.Errors > 0)
 747                                         return;
 748
 749                                 EmitMeta (block);
 750
 751                                 current_phase = Phase.Emitting;
 752 #if PRODUCTION
 753                                 try {
 754 #endif
 755                                 EmitResolvedTopBlock (block, unreachable);
 756 #if PRODUCTION
 757                                 } catch (Exception e){
 758                                         Console.WriteLine ("Exception caught by the compiler while emitting:");
 759                                         Console.WriteLine ("   Block that caused the problem begin at: " + block.loc);
 760
 761                                         Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 762                                         throw;
 763                                 }
 764 #endif
 765                         }
 766                 }
 767
 768                 bool resolved;
 769                 bool unreachable;
 770
 771                 public bool ResolveTopBlock (EmitContext anonymous_method_host, ToplevelBlock block,
 772                                              Parameters ip, IMethodData md, out bool unreachable)
 773                 {
 774                         if (resolved) {
 775                                 unreachable = this.unreachable;
 776                                 return true;
 777                         }
 778
 779                         current_phase = Phase.Resolving;
 780                         unreachable = false;
 781
 782                         if (!loc.IsNull)
 783                                 CurrentFile = loc.File;
 784
 785 #if PRODUCTION
 786                         try {
 787 #endif
 788                                 if (!block.ResolveMeta (this, ip))
 789                                         return false;
 790
 791                                 using (this.With (EmitContext.Flags.DoFlowAnalysis, true)) {
 792                                         FlowBranchingToplevel top_level;
 793                                         if (anonymous_method_host != null)
 794                                                 top_level = new FlowBranchingToplevel (anonymous_method_host.CurrentBranching, block);
 795                                         else
 796                                                 top_level = block.TopLevelBranching;
 797
 798                                         current_flow_branching = top_level;
 799                                         bool ok = block.Resolve (this);
 800                                         current_flow_branching = null;
 801
 802                                         if (!ok)
 803                                                 return false;
 804
 805                                         bool flow_unreachable = top_level.End ();
 806                                         if (flow_unreachable)
 807                                                 this.unreachable = unreachable = true;
 808                                 }
 809 #if PRODUCTION
 810                         } catch (Exception e) {
 811                                 Console.WriteLine ("Exception caught by the compiler while compiling:");
 812                                 Console.WriteLine ("   Block that caused the problem begin at: " + loc);
 813
 814                                 if (CurrentBlock != null){
 815                                         Console.WriteLine ("                     Block being compiled: [{0},{1}]",
 816                                                            CurrentBlock.StartLocation, CurrentBlock.EndLocation);
 817                                 }
 818                                 Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
 819                                 throw;
 820                         }
 821 #endif
 822
 823                         if (return_type != TypeManager.void_type && !unreachable) {
 824                                 if (CurrentAnonymousMethod == null) {
 825                                         Report.Error (161, md.Location, "`{0}': not all code paths return a value", md.GetSignatureForError ());
 826                                         return false;
 827                                 } else if (!CurrentAnonymousMethod.IsIterator) {
 828                                         Report.Error (1643, CurrentAnonymousMethod.Location, "Not all code paths return a value in anonymous method of type `{0}'",
 829                                                       CurrentAnonymousMethod.GetSignatureForError ());
 830                                         return false;
 831                                 }
 832                         }
 833
 834                         resolved = true;
 835                         return true;
 836                 }
 837
 838                 public Type ReturnType {
 839                         set {
 840                                 return_type = value;
 841                         }
 842                         get {
 843                                 return return_type;
 844                         }
 845                 }
 846
 847                 public void EmitResolvedTopBlock (ToplevelBlock block, bool unreachable)
 848                 {
 849                         if (block != null)
 850                                 block.Emit (this);
 851
 852                         if (HasReturnLabel)
 853                                 ig.MarkLabel (ReturnLabel);
 854
 855                         if (return_value != null){
 856                                 ig.Emit (OpCodes.Ldloc, return_value);
 857                                 ig.Emit (OpCodes.Ret);
 858                         } else {
 859                                 //
 860                                 // If `HasReturnLabel' is set, then we already emitted a
 861                                 // jump to the end of the method, so we must emit a `ret'
 862                                 // there.
 863                                 //
 864                                 // Unfortunately, System.Reflection.Emit automatically emits
 865                                 // a leave to the end of a finally block.  This is a problem
 866                                 // if no code is following the try/finally block since we may
 867                                 // jump to a point after the end of the method.
 868                                 // As a workaround, we're always creating a return label in
 869                                 // this case.
 870                                 //
 871
 872                                 if (HasReturnLabel || !unreachable) {
 873                                         if (return_type != TypeManager.void_type)
 874                                                 ig.Emit (OpCodes.Ldloc, TemporaryReturn ());
 875                                         ig.Emit (OpCodes.Ret);
 876                                 }
 877                         }
 878                 }
 879
 880                 /// <summary>
 881                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 882                 ///   writer to which source line this opcode belongs.
 883                 /// </summary>
 884                 public void Mark (Location loc)
 885                 {
 886                         if (!SymbolWriter.HasSymbolWriter || OmitDebuggingInfo || loc.IsNull)
 887                                 return;
 888
 889                         SymbolWriter.MarkSequencePoint (ig, loc);
 890                 }
 891
 892                 public void DefineLocalVariable (string name, LocalBuilder builder)
 893                 {
 894                         SymbolWriter.DefineLocalVariable (name, builder);
 895                 }
 896
 897                 public void BeginScope ()
 898                 {
 899                         ig.BeginScope();
 900                         SymbolWriter.OpenScope(ig);
 901                 }
 902
 903                 public void EndScope ()
 904                 {
 905                         ig.EndScope();
 906                         SymbolWriter.CloseScope(ig);
 907                 }
 908
 909                 /// <summary>
 910                 ///   Returns a temporary storage for a variable of type t as
 911                 ///   a local variable in the current body.
 912                 /// </summary>
 913                 public LocalBuilder GetTemporaryLocal (Type t)
 914                 {
 915                         if (temporary_storage != null) {
 916                                 object o = temporary_storage [t];
 917                                 if (o != null) {
 918                                         if (o is Stack) {
 919                                                 Stack s = (Stack) o;
 920                                                 o = s.Count == 0 ? null : s.Pop ();
 921                                         } else {
 922                                                 temporary_storage.Remove (t);
 923                                         }
 924                                 }
 925                                 if (o != null)
 926                                         return (LocalBuilder) o;
 927                         }
 928                         return ig.DeclareLocal (t);
 929                 }
 930
 931                 public void FreeTemporaryLocal (LocalBuilder b, Type t)
 932                 {
 933                         if (temporary_storage == null) {
 934                                 temporary_storage = new Hashtable ();
 935                                 temporary_storage [t] = b;
 936                                 return;
 937                         }
 938                         object o = temporary_storage [t];
 939                         if (o == null) {
 940                                 temporary_storage [t] = b;
 941                                 return;
 942                         }
 943                         Stack s = o as Stack;
 944                         if (s == null) {
 945                                 s = new Stack ();
 946                                 s.Push (o);
 947                                 temporary_storage [t] = s;
 948                         }
 949                         s.Push (b);
 950                 }
 951
 952                 /// <summary>
 953                 ///   Current loop begin and end labels.
 954                 /// </summary>
 955                 public Label LoopBegin, LoopEnd;
 956
 957                 /// <summary>
 958                 ///   Default target in a switch statement.   Only valid if
 959                 ///   InSwitch is true
 960                 /// </summary>
 961                 public Label DefaultTarget;
 962
 963                 /// <summary>
 964                 ///   If this is non-null, points to the current switch statement
 965                 /// </summary>
 966                 public Switch Switch;
 967
 968                 /// <summary>
 969                 ///   ReturnValue creates on demand the LocalBuilder for the
 970                 ///   return value from the function.  By default this is not
 971                 ///   used.  This is only required when returns are found inside
 972                 ///   Try or Catch statements.
 973                 ///
 974                 ///   This method is typically invoked from the Emit phase, so
 975                 ///   we allow the creation of a return label if it was not
 976                 ///   requested during the resolution phase.   Could be cleaned
 977                 ///   up, but it would replicate a lot of logic in the Emit phase
 978                 ///   of the code that uses it.
 979                 /// </summary>
 980                 public LocalBuilder TemporaryReturn ()
 981                 {
 982                         if (return_value == null){
 983                                 return_value = ig.DeclareLocal (return_type);
 984                                 if (!HasReturnLabel){
 985                                         ReturnLabel = ig.DefineLabel ();
 986                                         HasReturnLabel = true;
 987                                 }
 988                         }
 989
 990                         return return_value;
 991                 }
 992
 993                 /// <summary>
 994                 ///   This method is used during the Resolution phase to flag the
 995                 ///   need to define the ReturnLabel
 996                 /// </summary>
 997                 public void NeedReturnLabel ()
 998                 {
 999                         if (current_phase != Phase.Resolving){
1000                                 //
1001                                 // The reason is that the `ReturnLabel' is declared between
1002                                 // resolution and emission
1003                                 //
1004                                 throw new Exception ("NeedReturnLabel called from Emit phase, should only be called during Resolve");
1005                         }
1006
1007                         if (!HasReturnLabel)
1008                                 HasReturnLabel = true;
1009                 }
1010
1011
1012                 public Expression GetThis (Location loc)
1013                 {
1014                         This my_this;
1015                         if (CurrentBlock != null)
1016                                 my_this = new This (CurrentBlock, loc);
1017                         else
1018                                 my_this = new This (loc);
1019
1020                         if (!my_this.ResolveBase (this))
1021                                 my_this = null;
1022
1023                         return my_this;
1024                 }
1025         }
1026
1027
1028         public abstract class CommonAssemblyModulClass : Attributable, IResolveContext {
1029
1030                 protected CommonAssemblyModulClass ():
1031                         base (null)
1032                 {
1033                 }
1034
1035                 public void AddAttributes (ArrayList attrs)
1036                 {
1037                         foreach (Attribute a in attrs)
1038                                 a.AttachTo (this);
1039
1040                         if (attributes == null) {
1041                                 attributes = new Attributes (attrs);
1042                                 return;
1043                         }
1044                         attributes.AddAttributes (attrs);
1045                 }
1046
1047                 public virtual void Emit (TypeContainer tc)
1048                 {
1049                         if (OptAttributes == null)
1050                                 return;
1051
1052                         OptAttributes.Emit ();
1053                 }
1054
1055                 protected Attribute ResolveAttribute (Type a_type)
1056                 {
1057                         Attribute a = OptAttributes.Search (a_type);
1058                         if (a != null) {
1059                                 a.Resolve ();
1060                         }
1061                         return a;
1062                 }
1063
1064                 public override IResolveContext ResolveContext {
1065                         get { return this; }
1066                 }
1067
1068                 #region IResolveContext Members
1069
1070                 public DeclSpace DeclContainer {
1071                         get { return RootContext.ToplevelTypes; }
1072                 }
1073
1074                 public DeclSpace GenericDeclContainer {
1075                         get { return DeclContainer; }
1076                 }
1077
1078                 public bool IsInObsoleteScope {
1079                         get { return false; }
1080                 }
1081
1082                 public bool IsInUnsafeScope {
1083                         get { return false; }
1084                 }
1085
1086                 #endregion
1087         }
1088
1089         public class AssemblyClass : CommonAssemblyModulClass {
1090                 // TODO: make it private and move all builder based methods here
1091                 public AssemblyBuilder Builder;
1092                 bool is_cls_compliant;
1093                 bool wrap_non_exception_throws;
1094                 Type runtime_compatibility_attr_type;
1095
1096                 public Attribute ClsCompliantAttribute;
1097
1098                 ListDictionary declarative_security;
1099 #if GMCS_SOURCE
1100                 bool has_extension_method;
1101                 public AssemblyName Name;
1102                 MethodInfo add_type_forwarder;
1103                 ListDictionary emitted_forwarders;
1104 #endif
1105
1106                 // Module is here just because of error messages
1107                 static string[] attribute_targets = new string [] { "assembly", "module" };
1108
1109                 public AssemblyClass (): base ()
1110                 {
1111 #if GMCS_SOURCE
1112                         wrap_non_exception_throws = true;
1113 #endif
1114                 }
1115
1116                 public bool HasExtensionMethods {
1117                         set {
1118 #if GMCS_SOURCE
1119                                 has_extension_method = value;
1120 #endif
1121                         }
1122                 }
1123
1124                 public bool IsClsCompliant {
1125                         get {
1126                                 return is_cls_compliant;
1127                         }
1128                 }
1129
1130                 public bool WrapNonExceptionThrows {
1131                         get {
1132                                 return wrap_non_exception_throws;
1133                         }
1134                 }
1135
1136                 public override AttributeTargets AttributeTargets {
1137                         get {
1138                                 return AttributeTargets.Assembly;
1139                         }
1140                 }
1141
1142                 public override bool IsClsComplianceRequired ()
1143                 {
1144                         return is_cls_compliant;
1145                 }
1146
1147                 public void Resolve ()
1148                 {
1149                         runtime_compatibility_attr_type = TypeManager.CoreLookupType (
1150                                 "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute", Kind.Class, false);
1151
1152                         if (RootContext.Unsafe) {
1153                                 //
1154                                 // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
1155                                 // when -unsafe option was specified
1156                                 //
1157
1158                                 Location loc = Location.Null;
1159
1160                                 MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
1161                                         new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);
1162
1163                                 ArrayList pos = new ArrayList (1);
1164                                 pos.Add (new Argument (new MemberAccess (new MemberAccess (system_security_permissions, "SecurityAction", loc), "RequestMinimum")));
1165
1166                                 ArrayList named = new ArrayList (1);
1167                                 named.Add (new DictionaryEntry ("SkipVerification", new Argument (new BoolLiteral (true, loc))));
1168
1169                                 GlobalAttribute g = new GlobalAttribute (new NamespaceEntry (null, null, null), "assembly", system_security_permissions,
1170                                         "SecurityPermissionAttribute", new object[] { pos, named }, loc, false);
1171                                 g.AttachTo (this);
1172
1173                                 if (g.Resolve () != null) {
1174                                         declarative_security = new ListDictionary ();
1175                                         g.ExtractSecurityPermissionSet (declarative_security);
1176                                 }
1177                         }
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                         if (TypeManager.cls_compliant_attribute_type != null)
1187                                 ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
1188
1189                         if (ClsCompliantAttribute != null) {
1190                                 is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue ();
1191                         }
1192
1193                         if (runtime_compatibility_attr_type != null) {
1194                                 Attribute a = ResolveAttribute (runtime_compatibility_attr_type);
1195                                 if (a != null) {
1196                                         object val = a.GetPropertyValue ("WrapNonExceptionThrows");
1197                                         if (val != null)
1198                                                 wrap_non_exception_throws = (bool) val;
1199                                 }
1200                         }
1201                 }
1202
1203                 // fix bug #56621
1204                 private void SetPublicKey (AssemblyName an, byte[] strongNameBlob)
1205                 {
1206                         try {
1207                                 // check for possible ECMA key
1208                                 if (strongNameBlob.Length == 16) {
1209                                         // will be rejected if not "the" ECMA key
1210                                         an.SetPublicKey (strongNameBlob);
1211                                 }
1212                                 else {
1213                                         // take it, with or without, a private key
1214                                         RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
1215                                         // and make sure we only feed the public part to Sys.Ref
1216                                         byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
1217
1218                                         // AssemblyName.SetPublicKey requires an additional header
1219                                         byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };
1220
1221                                         byte[] encodedPublicKey = new byte [12 + publickey.Length];
1222                                         Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
1223                                         Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
1224                                         an.SetPublicKey (encodedPublicKey);
1225                                 }
1226                         }
1227                         catch (Exception) {
1228                                 Error_AssemblySigning ("The specified file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
1229                                 Environment.Exit (1);
1230                         }
1231                 }
1232
1233                 // TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
1234                 public AssemblyName GetAssemblyName (string name, string output)
1235                 {
1236                         if (OptAttributes != null) {
1237                                 foreach (Attribute a in OptAttributes.Attrs) {
1238                                         // cannot rely on any resolve-based members before you call Resolve
1239                                         if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
1240                                                 continue;
1241
1242                                         // TODO: This code is buggy: comparing Attribute name without resolving is wrong.
1243                                         //       However, this is invoked by CodeGen.Init, when none of the namespaces
1244                                         //       are loaded yet.
1245                                         // TODO: Does not handle quoted attributes properly
1246                                         switch (a.Name) {
1247                                         case "AssemblyKeyFile":
1248                                         case "AssemblyKeyFileAttribute":
1249                                         case "System.Reflection.AssemblyKeyFileAttribute":
1250                                                 if (RootContext.StrongNameKeyFile != null) {
1251                                                         Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1252                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1253                                                                         "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
1254                                                 } else {
1255                                                         string value = a.GetString ();
1256                                                         if (value.Length != 0)
1257                                                                 RootContext.StrongNameKeyFile = value;
1258                                                 }
1259                                                 break;
1260                                         case "AssemblyKeyName":
1261                                         case "AssemblyKeyNameAttribute":
1262                                         case "System.Reflection.AssemblyKeyNameAttribute":
1263                                                 if (RootContext.StrongNameKeyContainer != null) {
1264                                                         Report.SymbolRelatedToPreviousError (a.Location, a.Name);
1265                                                         Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
1266                                                                         "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
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 && Name.GetPublicKey ().Length != 0) {
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                 static bool IsValidAssemblyVersion (string version)
1383                 {
1384                         Version v;
1385                         try {
1386                                 v = new Version (version);
1387                         } catch {
1388                                 try {
1389                                         int major = int.Parse (version, CultureInfo.InvariantCulture);
1390                                         v = new Version (major, 0);
1391                                 } catch {
1392                                         return false;
1393                                 }
1394                         }
1395
1396                         foreach (int candidate in new int [] { v.Major, v.Minor, v.Build, v.Revision }) {
1397                                 if (candidate > ushort.MaxValue)
1398                                         return false;
1399                         }
1400
1401                         return true;
1402                 }
1403
1404                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1405                 {
1406                         if (a.IsValidSecurityAttribute ()) {
1407                                 if (declarative_security == null)
1408                                         declarative_security = new ListDictionary ();
1409
1410                                 a.ExtractSecurityPermissionSet (declarative_security);
1411                                 return;
1412                         }
1413
1414                         if (a.Type == TypeManager.assembly_culture_attribute_type) {
1415                                 string value = a.GetString ();
1416                                 if (value == null || value.Length == 0)
1417                                         return;
1418
1419                                 if (RootContext.Target == Target.Exe) {
1420                                         a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
1421                                         return;
1422                                 }
1423                         }
1424
1425                         if (a.Type == TypeManager.assembly_version_attribute_type) {
1426                                 string value = a.GetString ();
1427                                 if (value == null || value.Length == 0)
1428                                         return;
1429
1430                                 value = value.Replace ('*', '0');
1431
1432                                 if (!IsValidAssemblyVersion (value)) {
1433                                         a.Error_AttributeEmitError (string.Format ("Specified version `{0}' is not valid", value));
1434                                         return;
1435                                 }
1436                         }
1437
1438 #if GMCS_SOURCE
1439                         if (a.Type == TypeManager.internals_visible_attr_type && !CheckInternalsVisibleAttribute (a))
1440                                 return;
1441
1442                         if (a.Type == TypeManager.type_forwarder_attr_type) {
1443                                 Type t = a.GetArgumentType ();
1444                                 if (t == null || TypeManager.HasElementType (t)) {
1445                                         Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
1446                                         return;
1447                                 }
1448
1449                                 if (emitted_forwarders == null) {
1450                                         emitted_forwarders = new ListDictionary();
1451                                 } else if (emitted_forwarders.Contains(t)) {
1452                                         Report.SymbolRelatedToPreviousError(((Attribute)emitted_forwarders[t]).Location, null);
1453                                         Report.Error(739, a.Location, "A duplicate type forward of type `{0}'",
1454                                                 TypeManager.CSharpName(t));
1455                                         return;
1456                                 }
1457
1458                                 emitted_forwarders.Add(t, a);
1459
1460                                 if (TypeManager.LookupDeclSpace (t) != null) {
1461                                         Report.SymbolRelatedToPreviousError (t);
1462                                         Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
1463                                                 TypeManager.CSharpName (t));
1464                                         return;
1465                                 }
1466
1467                                 if (t.IsNested) {
1468                                         Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
1469                                                 TypeManager.CSharpName (t));
1470                                         return;
1471                                 }
1472
1473                                 if (t.IsGenericType) {
1474                                         Report.Error (733, a.Location, "Cannot forward generic type `{0}'", TypeManager.CSharpName (t));
1475                                         return;
1476                                 }
1477
1478                                 if (add_type_forwarder == null) {
1479                                         add_type_forwarder = typeof (AssemblyBuilder).GetMethod ("AddTypeForwarder",
1480                                                 BindingFlags.NonPublic | BindingFlags.Instance);
1481
1482                                         if (add_type_forwarder == null) {
1483                                                 Report.RuntimeMissingSupport (a.Location, "TypeForwardedTo attribute");
1484                                                 return;
1485                                         }
1486                                 }
1487
1488                                 add_type_forwarder.Invoke (Builder, new object[] { t });
1489                                 return;
1490                         }
1491
1492                         if (a.Type == TypeManager.extension_attribute_type) {
1493                                 a.Error_MisusedExtensionAttribute ();
1494                                 return;
1495                         }
1496 #endif
1497                         Builder.SetCustomAttribute (customBuilder);
1498                 }
1499
1500                 public override void Emit (TypeContainer tc)
1501                 {
1502                         base.Emit (tc);
1503
1504 #if GMCS_SOURCE
1505                         if (has_extension_method)
1506                                 Builder.SetCustomAttribute (TypeManager.extension_attribute_attr);
1507 #endif
1508
1509                         if (runtime_compatibility_attr_type != null) {
1510                                 // FIXME: Does this belong inside SRE.AssemblyBuilder instead?
1511                                 if (OptAttributes == null || !OptAttributes.Contains (runtime_compatibility_attr_type)) {
1512                                         ConstructorInfo ci = TypeManager.GetPredefinedConstructor (
1513                                                 runtime_compatibility_attr_type, Location.Null, Type.EmptyTypes);
1514                                         PropertyInfo [] pis = new PropertyInfo [1];
1515                                         pis [0] = TypeManager.GetPredefinedProperty (runtime_compatibility_attr_type,
1516                                                 "WrapNonExceptionThrows", Location.Null, TypeManager.bool_type);
1517                                         object [] pargs = new object [1];
1518                                         pargs [0] = true;
1519                                         Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], pis, pargs));
1520                                 }
1521                         }
1522
1523                         if (declarative_security != null) {
1524
1525                                 MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1526                                 object builder_instance = Builder;
1527
1528                                 try {
1529                                         // Microsoft runtime hacking
1530                                         if (add_permission == null) {
1531                                                 Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
1532                                                 add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
1533
1534                                                 FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
1535                                                 builder_instance = fi.GetValue (Builder);
1536                                         }
1537
1538                                         object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
1539                                                                                                   declarative_security [SecurityAction.RequestOptional],
1540                                                                                                   declarative_security [SecurityAction.RequestRefuse] };
1541                                         add_permission.Invoke (builder_instance, args);
1542                                 }
1543                                 catch {
1544                                         Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
1545                                 }
1546                         }
1547                 }
1548
1549                 public override string[] ValidAttributeTargets {
1550                         get {
1551                                 return attribute_targets;
1552                         }
1553                 }
1554
1555                 // Wrapper for AssemblyBuilder.AddModule
1556                 static MethodInfo adder_method;
1557                 static public MethodInfo AddModule_Method {
1558                         get {
1559                                 if (adder_method == null)
1560                                         adder_method = typeof (AssemblyBuilder).GetMethod ("AddModule", BindingFlags.Instance|BindingFlags.NonPublic);
1561                                 return adder_method;
1562                         }
1563                 }
1564                 public Module AddModule (string module)
1565                 {
1566                         MethodInfo m = AddModule_Method;
1567                         if (m == null) {
1568                                 Report.RuntimeMissingSupport (Location.Null, "/addmodule");
1569                                 Environment.Exit (1);
1570                         }
1571
1572                         try {
1573                                 return (Module) m.Invoke (Builder, new object [] { module });
1574                         } catch (TargetInvocationException ex) {
1575                                 throw ex.InnerException;
1576                         }
1577                 }
1578         }
1579
1580         public class ModuleClass : CommonAssemblyModulClass {
1581                 // TODO: make it private and move all builder based methods here
1582                 public ModuleBuilder Builder;
1583                 bool m_module_is_unsafe;
1584 #if GMCS_SOURCE
1585                 bool has_default_charset;
1586 #endif
1587
1588                 public CharSet DefaultCharSet = CharSet.Ansi;
1589                 public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;
1590
1591                 static string[] attribute_targets = new string [] { "module" };
1592
1593                 public ModuleClass (bool is_unsafe)
1594                 {
1595                         m_module_is_unsafe = is_unsafe;
1596                 }
1597
1598                 public override AttributeTargets AttributeTargets {
1599                         get {
1600                                 return AttributeTargets.Module;
1601                         }
1602                 }
1603
1604                 public override bool IsClsComplianceRequired ()
1605                 {
1606                         return CodeGen.Assembly.IsClsCompliant;
1607                 }
1608
1609                 public override void Emit (TypeContainer tc)
1610                 {
1611                         base.Emit (tc);
1612
1613                         if (m_module_is_unsafe) {
1614                                 Type t = TypeManager.CoreLookupType ("System.Security", "UnverifiableCodeAttribute", Kind.Class, true);
1615                                 if (t != null) {
1616                                         ConstructorInfo unverifiable_code_ctor = TypeManager.GetPredefinedConstructor (t, Location.Null, Type.EmptyTypes);
1617                                         if (unverifiable_code_ctor != null)
1618                                                 Builder.SetCustomAttribute (new CustomAttributeBuilder (unverifiable_code_ctor, new object [0]));
1619                                 }
1620                         }
1621                 }
1622
1623                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
1624                 {
1625                         if (a.Type == TypeManager.cls_compliant_attribute_type) {
1626                                 if (CodeGen.Assembly.ClsCompliantAttribute == null) {
1627                                         Report.Warning (3012, 1, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
1628                                 }
1629                                 else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
1630                                         Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
1631                                         Report.Warning (3017, 1, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
1632                                         return;
1633                                 }
1634                         }
1635
1636                         Builder.SetCustomAttribute (customBuilder);
1637                 }
1638
1639                 public bool HasDefaultCharSet {
1640                         get {
1641 #if GMCS_SOURCE
1642                                 return has_default_charset;
1643 #else
1644                                 return false;
1645 #endif
1646                         }
1647                 }
1648
1649                 /// <summary>
1650                 /// It is called very early therefore can resolve only predefined attributes
1651                 /// </summary>
1652                 public void Resolve ()
1653                 {
1654 #if GMCS_SOURCE
1655                         if (OptAttributes == null)
1656                                 return;
1657
1658                         if (!OptAttributes.CheckTargets())
1659                                 return;
1660
1661                         if (TypeManager.default_charset_type == null)
1662                                 return;
1663
1664                         Attribute a = ResolveAttribute (TypeManager.default_charset_type);
1665                         if (a != null) {
1666                                 has_default_charset = true;
1667                                 DefaultCharSet = a.GetCharSetValue ();
1668                                 switch (DefaultCharSet) {
1669                                 case CharSet.Ansi:
1670                                 case CharSet.None:
1671                                         break;
1672                                 case CharSet.Auto:
1673                                         DefaultCharSetType = TypeAttributes.AutoClass;
1674                                         break;
1675                                 case CharSet.Unicode:
1676                                         DefaultCharSetType = TypeAttributes.UnicodeClass;
1677                                         break;
1678                                 default:
1679                                         Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
1680                                         break;
1681                                 }
1682                         }
1683 #endif
1684                 }
1685
1686                 public override string[] ValidAttributeTargets {
1687                         get {
1688                                 return attribute_targets;
1689                         }
1690                 }
1691         }
1692 }