mcs/class/corlib/System.Reflection.Emit/MethodBuilder.cs

   1 //
   2 // System.Reflection.Emit/MethodBuilder.cs
   3 //
   4 // Author:
   5 //   Paolo Molaro (lupus@ximian.com)
   6 //
   7 // (C) 2001 Ximian, Inc.  http://www.ximian.com
   8 //
   9
  10 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Reflection;
  35 using System.Reflection.Emit;
  36 using System.Globalization;
  37 using System.Security;
  38 using System.Security.Permissions;
  39 using System.Runtime.CompilerServices;
  40 using System.Runtime.InteropServices;
  41 using System.Diagnostics.SymbolStore;
  42
  43 namespace System.Reflection.Emit
  44 {
  45         [ComVisible (true)]
  46         [ComDefaultInterface (typeof (_MethodBuilder))]
  47         [ClassInterface (ClassInterfaceType.None)]
  48         [StructLayout (LayoutKind.Sequential)]
  49         public sealed class MethodBuilder : MethodInfo, _MethodBuilder
  50         {
  51 #pragma warning disable 169, 414
  52                 private RuntimeMethodHandle mhandle;
  53                 private Type rtype;
  54                 internal Type[] parameters;
  55                 private MethodAttributes attrs; /* It's used directly by MCS */
  56                 private MethodImplAttributes iattrs;
  57                 private string name;
  58                 private int table_idx;
  59                 private byte[] code;
  60                 private ILGenerator ilgen;
  61                 private TypeBuilder type;
  62                 internal ParameterBuilder[] pinfo;
  63                 private CustomAttributeBuilder[] cattrs;
  64                 private MethodInfo[] override_methods;
  65                 private string pi_dll;
  66                 private string pi_entry;
  67                 private CharSet charset;
  68                 private uint extra_flags; /* this encodes set_last_error etc */
  69                 private CallingConvention native_cc;
  70                 private CallingConventions call_conv;
  71                 private bool init_locals = true;
  72                 private IntPtr generic_container;
  73                 internal GenericTypeParameterBuilder[] generic_params;
  74                 private Type[] returnModReq;
  75                 private Type[] returnModOpt;
  76                 private Type[][] paramModReq;
  77                 private Type[][] paramModOpt;
  78                 private RefEmitPermissionSet[] permissions;
  79 #pragma warning restore 169, 414
  80
  81                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt)
  82                 {
  83                         this.name = name;
  84                         this.attrs = attributes;
  85                         this.call_conv = callingConvention;
  86                         this.rtype = returnType;
  87                         this.returnModReq = returnModReq;
  88                         this.returnModOpt = returnModOpt;
  89                         this.paramModReq = paramModReq;
  90                         this.paramModOpt = paramModOpt;
  91                         // The MSDN docs does not specify this, but the MS MethodBuilder
  92                         // appends a HasThis flag if the method is not static
  93                         if ((attributes & MethodAttributes.Static) == 0)
  94                                 this.call_conv |= CallingConventions.HasThis;
  95                         if (parameterTypes != null) {
  96                                 for (int i = 0; i < parameterTypes.Length; ++i)
  97                                         if (parameterTypes [i] == null)
  98                                                 throw new ArgumentException ("Elements of the parameterTypes array cannot be null", "parameterTypes");
  99
 100                                 this.parameters = new Type [parameterTypes.Length];
 101                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
 102                         }
 103                         type = tb;
 104                         table_idx = get_next_table_index (this, 0x06, true);
 105
 106                         ((ModuleBuilder)tb.Module).RegisterToken (this, GetToken ().Token);
 107                 }
 108
 109                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
 110                                                                 CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt,
 111                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
 112                         : this (tb, name, attributes, callingConvention, returnType, returnModReq, returnModOpt, parameterTypes, paramModReq, paramModOpt)
 113                 {
 114                         pi_dll = dllName;
 115                         pi_entry = entryName;
 116                         native_cc = nativeCConv;
 117                         charset = nativeCharset;
 118                 }
 119
 120                 public override bool ContainsGenericParameters {
 121                         get { throw new NotSupportedException (); }
 122                 }
 123
 124                 public bool InitLocals {
 125                         get {return init_locals;}
 126                         set {init_locals = value;}
 127                 }
 128
 129                 internal TypeBuilder TypeBuilder {
 130                         get {return type;}
 131                 }
 132
 133                 public override RuntimeMethodHandle MethodHandle {
 134                         get {
 135                                 throw NotSupported ();
 136                         }
 137                 }
 138
 139                 public override Type ReturnType {
 140                         get { return rtype; }
 141                 }
 142
 143                 public override Type ReflectedType {
 144                         get { return type; }
 145                 }
 146
 147                 public override Type DeclaringType {
 148                         get { return type; }
 149                 }
 150
 151                 public override string Name {
 152                         get { return name; }
 153                 }
 154
 155                 public override MethodAttributes Attributes {
 156                         get { return attrs; }
 157                 }
 158
 159                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 160                         get { return null; }
 161                 }
 162
 163                 public override CallingConventions CallingConvention {
 164                         get { return call_conv; }
 165                 }
 166
 167                 [MonoTODO("Not implemented")]
 168                 public string Signature {
 169                         get {
 170                                 throw new NotImplementedException ();
 171                         }
 172                 }
 173
 174                 /* Used by mcs */
 175                 internal bool BestFitMapping {
 176                         set {
 177                                 extra_flags = (uint) ((extra_flags & ~0x30) | (uint)(value ? 0x10 : 0x20));
 178                         }
 179                 }
 180
 181                 /* Used by mcs */
 182                 internal bool ThrowOnUnmappableChar {
 183                         set {
 184                                 extra_flags = (uint) ((extra_flags & ~0x3000) | (uint)(value ? 0x1000 : 0x2000));
 185                         }
 186                 }
 187
 188                 /* Used by mcs */
 189                 internal bool ExactSpelling {
 190                         set {
 191                                 extra_flags = (uint) ((extra_flags & ~0x01) | (uint)(value ? 0x01 : 0x00));
 192                         }
 193                 }
 194
 195                 /* Used by mcs */
 196                 internal bool SetLastError {
 197                         set {
 198                                 extra_flags = (uint) ((extra_flags & ~0x40) | (uint)(value ? 0x40 : 0x00));
 199                         }
 200                 }
 201
 202                 public MethodToken GetToken()
 203                 {
 204                         return new MethodToken(0x06000000 | table_idx);
 205                 }
 206
 207                 public override MethodInfo GetBaseDefinition()
 208                 {
 209                         return this;
 210                 }
 211
 212                 public override MethodImplAttributes GetMethodImplementationFlags()
 213                 {
 214                         return iattrs;
 215                 }
 216
 217                 public override ParameterInfo[] GetParameters()
 218                 {
 219                         if (!type.is_created)
 220                                 throw NotSupported ();
 221                         if (parameters == null)
 222                                 return null;
 223
 224                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 225                         for (int i = 0; i < parameters.Length; i++) {
 226                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 227                         }
 228                         return retval;
 229                 }
 230
 231                 internal override int GetParameterCount ()
 232                 {
 233                         if (parameters == null)
 234                                 return 0;
 235
 236                         return parameters.Length;
 237                 }
 238
 239                 internal override Type GetParameterType (int pos) {
 240                         return parameters [pos];
 241                 }
 242
 243                 public Module GetModule ()
 244                 {
 245                         return type.Module;
 246                 }
 247
 248                 public void CreateMethodBody (byte[] il, int count)
 249                 {
 250                         if ((il != null) && ((count < 0) || (count > il.Length)))
 251                                 throw new ArgumentOutOfRangeException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 252
 253                         if ((code != null) || type.is_created)
 254                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 255
 256                         if (il == null)
 257                                 code = null;
 258                         else {
 259                                 code = new byte [count];
 260                                 System.Array.Copy(il, code, count);
 261                         }
 262                 }
 263
 264                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
 265                 {
 266                         throw NotSupported ();
 267                 }
 268
 269                 public override bool IsDefined (Type attributeType, bool inherit)
 270                 {
 271                         throw NotSupported ();
 272                 }
 273
 274                 public override object[] GetCustomAttributes (bool inherit)
 275                 {
 276                         /*
 277                          * On MS.NET, this always returns not_supported, but we can't do this
 278                          * since there would be no way to obtain custom attributes of
 279                          * dynamically created ctors.
 280                          */
 281                         if (type.is_created)
 282                                 return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 283                         else
 284                                 throw NotSupported ();
 285                 }
 286
 287                 public override object[] GetCustomAttributes (Type attributeType, bool inherit)
 288                 {
 289                         if (type.is_created)
 290                                 return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 291                         else
 292                                 throw NotSupported ();
 293                 }
 294
 295                 public ILGenerator GetILGenerator ()
 296                 {
 297                         return GetILGenerator (64);
 298                 }
 299
 300                 public ILGenerator GetILGenerator (int size)
 301                 {
 302                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 303                                  MethodImplAttributes.IL) ||
 304                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 305                                  MethodImplAttributes.Managed))
 306                                 throw new InvalidOperationException ("Method body should not exist.");
 307                         if (ilgen != null)
 308                                 return ilgen;
 309                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 310                         return ilgen;
 311                 }
 312
 313                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 314                 {
 315                         RejectIfCreated ();
 316
 317                         //
 318                         // Extension: Mono allows position == 0 for the return attribute
 319                         //
 320                         if ((position < 0) || (position > parameters.Length))
 321                                 throw new ArgumentOutOfRangeException ("position");
 322
 323                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 324                         if (pinfo == null)
 325                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 326                         pinfo [position] = pb;
 327                         return pb;
 328                 }
 329
 330                 internal void check_override ()
 331                 {
 332                         if (override_methods != null) {
 333                                 foreach (var m in override_methods) {
 334                                         if (m.IsVirtual && !IsVirtual)
 335                                                 throw new TypeLoadException (String.Format("Method '{0}' override '{1}' but it is not virtual", name, m));
 336                                 }
 337                         }
 338                 }
 339
 340                 internal void fixup ()
 341                 {
 342                         if (((attrs & (MethodAttributes.Abstract | MethodAttributes.PinvokeImpl)) == 0) && ((iattrs & (MethodImplAttributes.Runtime | MethodImplAttributes.InternalCall)) == 0)) {
 343                                 // do not allow zero length method body on MS.NET 2.0 (and higher)
 344                                 if (((ilgen == null) || (ilgen.ILOffset == 0)) && (code == null || code.Length == 0))
 345                                         throw new InvalidOperationException (
 346                                                                              String.Format ("Method '{0}.{1}' does not have a method body.",
 347                                                                                             DeclaringType.FullName, Name));
 348                         }
 349                         if (ilgen != null)
 350                                 ilgen.label_fixup ();
 351                 }
 352
 353                 internal void GenerateDebugInfo (ISymbolWriter symbolWriter)
 354                 {
 355                         if (ilgen != null && ilgen.HasDebugInfo) {
 356                                 SymbolToken token = new SymbolToken (GetToken().Token);
 357                                 symbolWriter.OpenMethod (token);
 358                                 symbolWriter.SetSymAttribute (token, "__name", System.Text.Encoding.UTF8.GetBytes (Name));
 359                                 ilgen.GenerateDebugInfo (symbolWriter);
 360                                 symbolWriter.CloseMethod ();
 361                         }
 362                 }
 363
 364                 public void SetCustomAttribute (CustomAttributeBuilder customBuilder)
 365                 {
 366                         if (customBuilder == null)
 367                                 throw new ArgumentNullException ("customBuilder");
 368
 369                         switch (customBuilder.Ctor.ReflectedType.FullName) {
 370                                 case "System.Runtime.CompilerServices.MethodImplAttribute":
 371                                         byte[] data = customBuilder.Data;
 372                                         int impla; // the (stupid) ctor takes a short or an int ...
 373                                         impla = (int)data [2];
 374                                         impla |= ((int)data [3]) << 8;
 375                                         iattrs |= (MethodImplAttributes)impla;
 376                                         return;
 377
 378                                 case "System.Runtime.InteropServices.DllImportAttribute":
 379                                         CustomAttributeBuilder.CustomAttributeInfo attr = CustomAttributeBuilder.decode_cattr (customBuilder);
 380                                         bool preserveSig = true;
 381
 382                                         /*
 383                                          * It would be easier to construct a DllImportAttribute from
 384                                          * the custom attribute builder, but the DllImportAttribute
 385                                          * does not contain all the information required here, ie.
 386                                          * - some parameters, like BestFitMapping has three values
 387                                          *   ("on", "off", "missing"), but DllImportAttribute only
 388                                          *   contains two (on/off).
 389                                          * - PreserveSig is true by default, while it is false by
 390                                          *   default in DllImportAttribute.
 391                                          */
 392
 393                                         pi_dll = (string)attr.ctorArgs[0];
 394                                         if (pi_dll == null || pi_dll.Length == 0)
 395                                                 throw new ArgumentException ("DllName cannot be empty");
 396
 397                                         native_cc = System.Runtime.InteropServices.CallingConvention.Winapi;
 398
 399                                         for (int i = 0; i < attr.namedParamNames.Length; ++i) {
 400                                                 string name = attr.namedParamNames [i];
 401                                                 object value = attr.namedParamValues [i];
 402
 403                                                 if (name == "CallingConvention")
 404                                                         native_cc = (CallingConvention)value;
 405                                                 else if (name == "CharSet")
 406                                                         charset = (CharSet)value;
 407                                                 else if (name == "EntryPoint")
 408                                                         pi_entry = (string)value;
 409                                                 else if (name == "ExactSpelling")
 410                                                         ExactSpelling = (bool)value;
 411                                                 else if (name == "SetLastError")
 412                                                         SetLastError = (bool)value;
 413                                                 else if (name == "PreserveSig")
 414                                                         preserveSig = (bool)value;
 415                                         else if (name == "BestFitMapping")
 416                                                 BestFitMapping = (bool)value;
 417                                         else if (name == "ThrowOnUnmappableChar")
 418                                                 ThrowOnUnmappableChar = (bool)value;
 419                                         }
 420
 421                                         attrs |= MethodAttributes.PinvokeImpl;
 422                                         if (preserveSig)
 423                                                 iattrs |= MethodImplAttributes.PreserveSig;
 424                                         return;
 425
 426                                 case "System.Runtime.InteropServices.PreserveSigAttribute":
 427                                         iattrs |= MethodImplAttributes.PreserveSig;
 428                                         return;
 429                                 case "System.Runtime.CompilerServices.SpecialNameAttribute":
 430                                         attrs |= MethodAttributes.SpecialName;
 431                                         return;
 432                                 case "System.Security.SuppressUnmanagedCodeSecurityAttribute":
 433                                         attrs |= MethodAttributes.HasSecurity;
 434                                         break;
 435                         }
 436
 437                         if (cattrs != null) {
 438                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 439                                 cattrs.CopyTo (new_array, 0);
 440                                 new_array [cattrs.Length] = customBuilder;
 441                                 cattrs = new_array;
 442                         } else {
 443                                 cattrs = new CustomAttributeBuilder [1];
 444                                 cattrs [0] = customBuilder;
 445                         }
 446                 }
 447
 448                 [ComVisible (true)]
 449                 public void SetCustomAttribute (ConstructorInfo con, byte[] binaryAttribute)
 450                 {
 451                         if (con == null)
 452                                 throw new ArgumentNullException ("con");
 453                         if (binaryAttribute == null)
 454                                 throw new ArgumentNullException ("binaryAttribute");
 455                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 456                 }
 457
 458                 public void SetImplementationFlags (MethodImplAttributes attributes)
 459                 {
 460                         RejectIfCreated ();
 461                         iattrs = attributes;
 462                 }
 463
 464                 public void AddDeclarativeSecurity (SecurityAction action, PermissionSet pset)
 465                 {
 466 #if !NET_2_1
 467                         if (pset == null)
 468                                 throw new ArgumentNullException ("pset");
 469                         if ((action == SecurityAction.RequestMinimum) ||
 470                                 (action == SecurityAction.RequestOptional) ||
 471                                 (action == SecurityAction.RequestRefuse))
 472                                 throw new ArgumentOutOfRangeException ("Request* values are not permitted", "action");
 473
 474                         RejectIfCreated ();
 475
 476                         if (permissions != null) {
 477                                 /* Check duplicate actions */
 478                                 foreach (RefEmitPermissionSet set in permissions)
 479                                         if (set.action == action)
 480                                                 throw new InvalidOperationException ("Multiple permission sets specified with the same SecurityAction.");
 481
 482                                 RefEmitPermissionSet[] new_array = new RefEmitPermissionSet [permissions.Length + 1];
 483                                 permissions.CopyTo (new_array, 0);
 484                                 permissions = new_array;
 485                         }
 486                         else
 487                                 permissions = new RefEmitPermissionSet [1];
 488
 489                         permissions [permissions.Length - 1] = new RefEmitPermissionSet (action, pset.ToXml ().ToString ());
 490                         attrs |= MethodAttributes.HasSecurity;
 491 #endif
 492                 }
 493
 494                 [Obsolete ("An alternate API is available: Emit the MarshalAs custom attribute instead.")]
 495                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 496                 {
 497                         RejectIfCreated ();
 498                         throw new NotImplementedException ();
 499                 }
 500
 501                 [MonoTODO]
 502                 public void SetSymCustomAttribute (string name, byte[] data)
 503                 {
 504                         RejectIfCreated ();
 505                         throw new NotImplementedException ();
 506                 }
 507
 508                 public override string ToString()
 509                 {
 510                         return "MethodBuilder [" + type.Name + "::" + name + "]";
 511                 }
 512
 513                 [MonoTODO]
 514                 public override bool Equals (object obj)
 515                 {
 516                         return base.Equals (obj);
 517                 }
 518
 519                 public override int GetHashCode ()
 520                 {
 521                         return name.GetHashCode ();
 522                 }
 523
 524                 internal override int get_next_table_index (object obj, int table, bool inc)
 525                 {
 526                         return type.get_next_table_index (obj, table, inc);
 527                 }
 528
 529                 void ExtendArray<T> (ref T[] array, T elem) {
 530                         if (array == null) {
 531                                 array = new T [1];
 532                         } else {
 533                                 var newa = new T [array.Length + 1];
 534                                 Array.Copy (array, newa, array.Length);
 535                                 array = newa;
 536                         }
 537                         array [array.Length - 1] = elem;
 538                 }
 539
 540                 internal void set_override (MethodInfo mdecl)
 541                 {
 542                         ExtendArray<MethodInfo> (ref override_methods, mdecl);
 543                 }
 544
 545                 private void RejectIfCreated ()
 546                 {
 547                         if (type.is_created)
 548                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 549                 }
 550
 551                 private Exception NotSupported ()
 552                 {
 553                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 554                 }
 555
 556                 public override MethodInfo MakeGenericMethod (params Type [] typeArguments)
 557                 {
 558                         if (!IsGenericMethodDefinition)
 559                                 throw new InvalidOperationException ("Method is not a generic method definition");
 560                         if (typeArguments == null)
 561                                 throw new ArgumentNullException ("typeArguments");
 562                         if (generic_params.Length != typeArguments.Length)
 563                                 throw new ArgumentException ("Incorrect length", "typeArguments");
 564                         foreach (Type type in typeArguments) {
 565                                 if (type == null)
 566                                         throw new ArgumentNullException ("typeArguments");
 567                         }
 568
 569                         return new MethodOnTypeBuilderInst (this, typeArguments);
 570                 }
 571
 572                 public override bool IsGenericMethodDefinition {
 573                         get {
 574                                 return generic_params != null;
 575                         }
 576                 }
 577
 578                 public override bool IsGenericMethod {
 579                         get {
 580                                 return generic_params != null;
 581                         }
 582                 }
 583
 584                 public override MethodInfo GetGenericMethodDefinition ()
 585                 {
 586                         if (!IsGenericMethodDefinition)
 587                                 throw new InvalidOperationException ();
 588
 589                         return this;
 590                 }
 591
 592                 public override Type[] GetGenericArguments ()
 593                 {
 594                         if (generic_params == null)
 595                                 return null;
 596
 597                         Type[] result = new Type [generic_params.Length];
 598                         for (int i = 0; i < generic_params.Length; i++)
 599                                 result [i] = generic_params [i];
 600
 601                         return result;
 602                 }
 603
 604                 public GenericTypeParameterBuilder[] DefineGenericParameters (params string[] names)
 605                 {
 606                         if (names == null)
 607                                 throw new ArgumentNullException ("names");
 608                         if (names.Length == 0)
 609                                 throw new ArgumentException ("names");
 610
 611                         generic_params = new GenericTypeParameterBuilder [names.Length];
 612                         for (int i = 0; i < names.Length; i++) {
 613                                 string item = names [i];
 614                                 if (item == null)
 615                                         throw new ArgumentNullException ("names");
 616                                 generic_params [i] = new GenericTypeParameterBuilder (type, this, item, i);
 617                         }
 618
 619                         return generic_params;
 620                 }
 621
 622                 public void SetReturnType (Type returnType)
 623                 {
 624                         rtype = returnType;
 625                 }
 626
 627                 public void SetParameters (params Type[] parameterTypes)
 628                 {
 629                         if (parameterTypes != null) {
 630                                 for (int i = 0; i < parameterTypes.Length; ++i)
 631                                         if (parameterTypes [i] == null)
 632                                                 throw new ArgumentException ("Elements of the parameterTypes array cannot be null", "parameterTypes");
 633
 634                                 this.parameters = new Type [parameterTypes.Length];
 635                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
 636                         }
 637                 }
 638
 639                 public void SetSignature (Type returnType, Type[] returnTypeRequiredCustomModifiers, Type[] returnTypeOptionalCustomModifiers, Type[] parameterTypes, Type[][] parameterTypeRequiredCustomModifiers, Type[][] parameterTypeOptionalCustomModifiers)
 640                 {
 641                         SetReturnType (returnType);
 642                         SetParameters (parameterTypes);
 643                         this.returnModReq = returnTypeRequiredCustomModifiers;
 644                         this.returnModOpt = returnTypeOptionalCustomModifiers;
 645                         this.paramModReq = parameterTypeRequiredCustomModifiers;
 646                         this.paramModOpt = parameterTypeOptionalCustomModifiers;
 647                 }
 648
 649                 public override Module Module {
 650                         get {
 651                                 return base.Module;
 652                         }
 653                 }
 654
 655                 void _MethodBuilder.GetIDsOfNames([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
 656                 {
 657                         throw new NotImplementedException ();
 658                 }
 659
 660                 void _MethodBuilder.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
 661                 {
 662                         throw new NotImplementedException ();
 663                 }
 664
 665                 void _MethodBuilder.GetTypeInfoCount (out uint pcTInfo)
 666                 {
 667                         throw new NotImplementedException ();
 668                 }
 669
 670                 void _MethodBuilder.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams, IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
 671                 {
 672                         throw new NotImplementedException ();
 673                 }
 674
 675 #if NET_4_0 || MOONLIGHT
 676                 public override ParameterInfo ReturnParameter {
 677                         get { return base.ReturnParameter; }
 678                 }
 679 #endif
 680         }
 681 }