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 #if !FULL_AOT_RUNTIME
  34 using System;
  35 using System.Reflection;
  36 using System.Reflection.Emit;
  37 using System.Globalization;
  38 using System.Security;
  39 using System.Security.Permissions;
  40 using System.Runtime.CompilerServices;
  41 using System.Runtime.InteropServices;
  42 using System.Diagnostics.SymbolStore;
  43 using System.Collections.Generic;
  44
  45 namespace System.Reflection.Emit
  46 {
  47         [ComVisible (true)]
  48         [ComDefaultInterface (typeof (_MethodBuilder))]
  49         [ClassInterface (ClassInterfaceType.None)]
  50         [StructLayout (LayoutKind.Sequential)]
  51         public sealed class MethodBuilder : MethodInfo, _MethodBuilder
  52         {
  53 #pragma warning disable 169, 414
  54                 private RuntimeMethodHandle mhandle;
  55                 private Type rtype;
  56                 internal Type[] parameters;
  57                 private MethodAttributes attrs; /* It's used directly by MCS */
  58                 private MethodImplAttributes iattrs;
  59                 private string name;
  60                 private int table_idx;
  61                 private byte[] code;
  62                 private ILGenerator ilgen;
  63                 private TypeBuilder type;
  64                 internal ParameterBuilder[] pinfo;
  65                 private CustomAttributeBuilder[] cattrs;
  66                 private MethodInfo[] override_methods;
  67                 private string pi_dll;
  68                 private string pi_entry;
  69                 private CharSet charset;
  70                 private uint extra_flags; /* this encodes set_last_error etc */
  71                 private CallingConvention native_cc;
  72                 private CallingConventions call_conv;
  73                 private bool init_locals = true;
  74                 private IntPtr generic_container;
  75                 internal GenericTypeParameterBuilder[] generic_params;
  76                 private Type[] returnModReq;
  77                 private Type[] returnModOpt;
  78                 private Type[][] paramModReq;
  79                 private Type[][] paramModOpt;
  80                 private RefEmitPermissionSet[] permissions;
  81 #pragma warning restore 169, 414
  82
  83                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt)
  84                 {
  85                         this.name = name;
  86                         this.attrs = attributes;
  87                         this.call_conv = callingConvention;
  88                         this.rtype = returnType;
  89                         this.returnModReq = returnModReq;
  90                         this.returnModOpt = returnModOpt;
  91                         this.paramModReq = paramModReq;
  92                         this.paramModOpt = paramModOpt;
  93                         // The MSDN docs does not specify this, but the MS MethodBuilder
  94                         // appends a HasThis flag if the method is not static
  95                         if ((attributes & MethodAttributes.Static) == 0)
  96                                 this.call_conv |= CallingConventions.HasThis;
  97                         if (parameterTypes != null) {
  98                                 for (int i = 0; i < parameterTypes.Length; ++i)
  99                                         if (parameterTypes [i] == null)
 100                                                 throw new ArgumentException ("Elements of the parameterTypes array cannot be null", "parameterTypes");
 101
 102                                 this.parameters = new Type [parameterTypes.Length];
 103                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
 104                         }
 105                         type = tb;
 106                         table_idx = get_next_table_index (this, 0x06, true);
 107
 108                         ((ModuleBuilder)tb.Module).RegisterToken (this, GetToken ().Token);
 109                 }
 110
 111                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
 112                                                                 CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt,
 113                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
 114                         : this (tb, name, attributes, callingConvention, returnType, returnModReq, returnModOpt, parameterTypes, paramModReq, paramModOpt)
 115                 {
 116                         pi_dll = dllName;
 117                         pi_entry = entryName;
 118                         native_cc = nativeCConv;
 119                         charset = nativeCharset;
 120                 }
 121
 122                 public override bool ContainsGenericParameters {
 123                         get { throw new NotSupportedException (); }
 124                 }
 125
 126                 public bool InitLocals {
 127                         get {return init_locals;}
 128                         set {init_locals = value;}
 129                 }
 130
 131                 internal TypeBuilder TypeBuilder {
 132                         get {return type;}
 133                 }
 134
 135                 public override RuntimeMethodHandle MethodHandle {
 136                         get {
 137                                 throw NotSupported ();
 138                         }
 139                 }
 140
 141                 public override Type ReturnType {
 142                         get { return rtype; }
 143                 }
 144
 145                 public override Type ReflectedType {
 146                         get { return type; }
 147                 }
 148
 149                 public override Type DeclaringType {
 150                         get { return type; }
 151                 }
 152
 153                 public override string Name {
 154                         get { return name; }
 155                 }
 156
 157                 public override MethodAttributes Attributes {
 158                         get { return attrs; }
 159                 }
 160
 161                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 162                         get { return null; }
 163                 }
 164
 165                 public override CallingConventions CallingConvention {
 166                         get { return call_conv; }
 167                 }
 168
 169                 [MonoTODO("Not implemented")]
 170                 public string Signature {
 171                         get {
 172                                 throw new NotImplementedException ();
 173                         }
 174                 }
 175
 176                 /* Used by mcs */
 177                 internal bool BestFitMapping {
 178                         set {
 179                                 extra_flags = (uint) ((extra_flags & ~0x30) | (uint)(value ? 0x10 : 0x20));
 180                         }
 181                 }
 182
 183                 /* Used by mcs */
 184                 internal bool ThrowOnUnmappableChar {
 185                         set {
 186                                 extra_flags = (uint) ((extra_flags & ~0x3000) | (uint)(value ? 0x1000 : 0x2000));
 187                         }
 188                 }
 189
 190                 /* Used by mcs */
 191                 internal bool ExactSpelling {
 192                         set {
 193                                 extra_flags = (uint) ((extra_flags & ~0x01) | (uint)(value ? 0x01 : 0x00));
 194                         }
 195                 }
 196
 197                 /* Used by mcs */
 198                 internal bool SetLastError {
 199                         set {
 200                                 extra_flags = (uint) ((extra_flags & ~0x40) | (uint)(value ? 0x40 : 0x00));
 201                         }
 202                 }
 203
 204                 public MethodToken GetToken()
 205                 {
 206                         return new MethodToken(0x06000000 | table_idx);
 207                 }
 208
 209                 public override MethodInfo GetBaseDefinition()
 210                 {
 211                         return this;
 212                 }
 213
 214                 public override MethodImplAttributes GetMethodImplementationFlags()
 215                 {
 216                         return iattrs;
 217                 }
 218
 219                 public override ParameterInfo[] GetParameters()
 220                 {
 221                         if (!type.is_created)
 222                                 throw NotSupported ();
 223
 224                         return GetParametersInternal ();
 225                 }
 226
 227                 internal override ParameterInfo[] GetParametersInternal ()
 228                 {
 229                         if (parameters == null)
 230                                 return null;
 231
 232                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 233                         for (int i = 0; i < parameters.Length; i++) {
 234                                 retval [i] = ParameterInfo.New (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 235                         }
 236                         return retval;
 237                 }
 238
 239                 internal override int GetParametersCount ()
 240                 {
 241                         if (parameters == null)
 242                                 return 0;
 243
 244                         return parameters.Length;
 245                 }
 246
 247                 internal override Type GetParameterType (int pos) {
 248                         return parameters [pos];
 249                 }
 250
 251                 public Module GetModule ()
 252                 {
 253                         return type.Module;
 254                 }
 255
 256                 public void CreateMethodBody (byte[] il, int count)
 257                 {
 258                         if ((il != null) && ((count < 0) || (count > il.Length)))
 259                                 throw new ArgumentOutOfRangeException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 260
 261                         if ((code != null) || type.is_created)
 262                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 263
 264                         if (il == null)
 265                                 code = null;
 266                         else {
 267                                 code = new byte [count];
 268                                 System.Array.Copy(il, code, count);
 269                         }
 270                 }
 271
 272                 public void SetMethodBody (byte[] il, int maxStack, byte[] localSignature,
 273                         IEnumerable<ExceptionHandler> exceptionHandlers, IEnumerable<int> tokenFixups)
 274                 {
 275                         var ilgen = GetILGenerator ();
 276                         ilgen.Init (il, maxStack, localSignature, exceptionHandlers, tokenFixups);
 277                 }
 278
 279                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
 280                 {
 281                         throw NotSupported ();
 282                 }
 283
 284                 public override bool IsDefined (Type attributeType, bool inherit)
 285                 {
 286                         throw NotSupported ();
 287                 }
 288
 289                 public override object[] GetCustomAttributes (bool inherit)
 290                 {
 291                         /*
 292                          * On MS.NET, this always returns not_supported, but we can't do this
 293                          * since there would be no way to obtain custom attributes of
 294                          * dynamically created ctors.
 295                          */
 296                         if (type.is_created)
 297                                 return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 298                         else
 299                                 throw NotSupported ();
 300                 }
 301
 302                 public override object[] GetCustomAttributes (Type attributeType, bool inherit)
 303                 {
 304                         if (type.is_created)
 305                                 return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 306                         else
 307                                 throw NotSupported ();
 308                 }
 309
 310                 public ILGenerator GetILGenerator ()
 311                 {
 312                         return GetILGenerator (64);
 313                 }
 314
 315                 public ILGenerator GetILGenerator (int size)
 316                 {
 317                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 318                                  MethodImplAttributes.IL) ||
 319                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 320                                  MethodImplAttributes.Managed))
 321                                 throw new InvalidOperationException ("Method body should not exist.");
 322                         if (ilgen != null)
 323                                 return ilgen;
 324                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 325                         return ilgen;
 326                 }
 327
 328                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 329                 {
 330                         RejectIfCreated ();
 331
 332                         //
 333                         // Extension: Mono allows position == 0 for the return attribute
 334                         //
 335                         if ((position < 0) || (position > parameters.Length))
 336                                 throw new ArgumentOutOfRangeException ("position");
 337
 338                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 339                         if (pinfo == null)
 340                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 341                         pinfo [position] = pb;
 342                         return pb;
 343                 }
 344
 345                 internal void check_override ()
 346                 {
 347                         if (override_methods != null) {
 348                                 foreach (var m in override_methods) {
 349                                         if (m.IsVirtual && !IsVirtual)
 350                                                 throw new TypeLoadException (String.Format("Method '{0}' override '{1}' but it is not virtual", name, m));
 351                                 }
 352                         }
 353                 }
 354
 355                 internal void fixup ()
 356                 {
 357                         if (((attrs & (MethodAttributes.Abstract | MethodAttributes.PinvokeImpl)) == 0) && ((iattrs & (MethodImplAttributes.Runtime | MethodImplAttributes.InternalCall)) == 0)) {
 358                                 // do not allow zero length method body on MS.NET 2.0 (and higher)
 359                                 if (((ilgen == null) || (ilgen.ILOffset == 0)) && (code == null || code.Length == 0))
 360                                         throw new InvalidOperationException (
 361                                                                              String.Format ("Method '{0}.{1}' does not have a method body.",
 362                                                                                             DeclaringType.FullName, Name));
 363                         }
 364                         if (ilgen != null)
 365                                 ilgen.label_fixup (this);
 366                 }
 367
 368                 internal void GenerateDebugInfo (ISymbolWriter symbolWriter)
 369                 {
 370                         if (ilgen != null && ilgen.HasDebugInfo) {
 371                                 SymbolToken token = new SymbolToken (GetToken().Token);
 372                                 symbolWriter.OpenMethod (token);
 373                                 symbolWriter.SetSymAttribute (token, "__name", System.Text.Encoding.UTF8.GetBytes (Name));
 374                                 ilgen.GenerateDebugInfo (symbolWriter);
 375                                 symbolWriter.CloseMethod ();
 376                         }
 377                 }
 378
 379                 public void SetCustomAttribute (CustomAttributeBuilder customBuilder)
 380                 {
 381                         if (customBuilder == null)
 382                                 throw new ArgumentNullException ("customBuilder");
 383
 384                         switch (customBuilder.Ctor.ReflectedType.FullName) {
 385                                 case "System.Runtime.CompilerServices.MethodImplAttribute":
 386                                         byte[] data = customBuilder.Data;
 387                                         int impla; // the (stupid) ctor takes a short or an int ...
 388                                         impla = (int)data [2];
 389                                         impla |= ((int)data [3]) << 8;
 390                                         iattrs |= (MethodImplAttributes)impla;
 391                                         return;
 392
 393                                 case "System.Runtime.InteropServices.DllImportAttribute":
 394                                         CustomAttributeBuilder.CustomAttributeInfo attr = CustomAttributeBuilder.decode_cattr (customBuilder);
 395                                         bool preserveSig = true;
 396
 397                                         /*
 398                                          * It would be easier to construct a DllImportAttribute from
 399                                          * the custom attribute builder, but the DllImportAttribute
 400                                          * does not contain all the information required here, ie.
 401                                          * - some parameters, like BestFitMapping has three values
 402                                          *   ("on", "off", "missing"), but DllImportAttribute only
 403                                          *   contains two (on/off).
 404                                          * - PreserveSig is true by default, while it is false by
 405                                          *   default in DllImportAttribute.
 406                                          */
 407
 408                                         pi_dll = (string)attr.ctorArgs[0];
 409                                         if (pi_dll == null || pi_dll.Length == 0)
 410                                                 throw new ArgumentException ("DllName cannot be empty");
 411
 412                                         native_cc = System.Runtime.InteropServices.CallingConvention.Winapi;
 413
 414                                         for (int i = 0; i < attr.namedParamNames.Length; ++i) {
 415                                                 string name = attr.namedParamNames [i];
 416                                                 object value = attr.namedParamValues [i];
 417
 418                                                 if (name == "CallingConvention")
 419                                                         native_cc = (CallingConvention)value;
 420                                                 else if (name == "CharSet")
 421                                                         charset = (CharSet)value;
 422                                                 else if (name == "EntryPoint")
 423                                                         pi_entry = (string)value;
 424                                                 else if (name == "ExactSpelling")
 425                                                         ExactSpelling = (bool)value;
 426                                                 else if (name == "SetLastError")
 427                                                         SetLastError = (bool)value;
 428                                                 else if (name == "PreserveSig")
 429                                                         preserveSig = (bool)value;
 430                                         else if (name == "BestFitMapping")
 431                                                 BestFitMapping = (bool)value;
 432                                         else if (name == "ThrowOnUnmappableChar")
 433                                                 ThrowOnUnmappableChar = (bool)value;
 434                                         }
 435
 436                                         attrs |= MethodAttributes.PinvokeImpl;
 437                                         if (preserveSig)
 438                                                 iattrs |= MethodImplAttributes.PreserveSig;
 439                                         return;
 440
 441                                 case "System.Runtime.InteropServices.PreserveSigAttribute":
 442                                         iattrs |= MethodImplAttributes.PreserveSig;
 443                                         return;
 444                                 case "System.Runtime.CompilerServices.SpecialNameAttribute":
 445                                         attrs |= MethodAttributes.SpecialName;
 446                                         return;
 447                                 case "System.Security.SuppressUnmanagedCodeSecurityAttribute":
 448                                         attrs |= MethodAttributes.HasSecurity;
 449                                         break;
 450                         }
 451
 452                         if (cattrs != null) {
 453                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 454                                 cattrs.CopyTo (new_array, 0);
 455                                 new_array [cattrs.Length] = customBuilder;
 456                                 cattrs = new_array;
 457                         } else {
 458                                 cattrs = new CustomAttributeBuilder [1];
 459                                 cattrs [0] = customBuilder;
 460                         }
 461                 }
 462
 463                 [ComVisible (true)]
 464                 public void SetCustomAttribute (ConstructorInfo con, byte[] binaryAttribute)
 465                 {
 466                         if (con == null)
 467                                 throw new ArgumentNullException ("con");
 468                         if (binaryAttribute == null)
 469                                 throw new ArgumentNullException ("binaryAttribute");
 470                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 471                 }
 472
 473                 public void SetImplementationFlags (MethodImplAttributes attributes)
 474                 {
 475                         RejectIfCreated ();
 476                         iattrs = attributes;
 477                 }
 478
 479                 public void AddDeclarativeSecurity (SecurityAction action, PermissionSet pset)
 480                 {
 481 #if !MOBILE
 482                         if (pset == null)
 483                                 throw new ArgumentNullException ("pset");
 484                         if ((action == SecurityAction.RequestMinimum) ||
 485                                 (action == SecurityAction.RequestOptional) ||
 486                                 (action == SecurityAction.RequestRefuse))
 487                                 throw new ArgumentOutOfRangeException ("Request* values are not permitted", "action");
 488
 489                         RejectIfCreated ();
 490
 491                         if (permissions != null) {
 492                                 /* Check duplicate actions */
 493                                 foreach (RefEmitPermissionSet set in permissions)
 494                                         if (set.action == action)
 495                                                 throw new InvalidOperationException ("Multiple permission sets specified with the same SecurityAction.");
 496
 497                                 RefEmitPermissionSet[] new_array = new RefEmitPermissionSet [permissions.Length + 1];
 498                                 permissions.CopyTo (new_array, 0);
 499                                 permissions = new_array;
 500                         }
 501                         else
 502                                 permissions = new RefEmitPermissionSet [1];
 503
 504                         permissions [permissions.Length - 1] = new RefEmitPermissionSet (action, pset.ToXml ().ToString ());
 505                         attrs |= MethodAttributes.HasSecurity;
 506 #endif
 507                 }
 508
 509                 [Obsolete ("An alternate API is available: Emit the MarshalAs custom attribute instead.")]
 510                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 511                 {
 512                         RejectIfCreated ();
 513                         throw new NotImplementedException ();
 514                 }
 515
 516                 [MonoTODO]
 517                 public void SetSymCustomAttribute (string name, byte[] data)
 518                 {
 519                         RejectIfCreated ();
 520                         throw new NotImplementedException ();
 521                 }
 522
 523                 public override string ToString()
 524                 {
 525                         return "MethodBuilder [" + type.Name + "::" + name + "]";
 526                 }
 527
 528                 [MonoTODO]
 529                 public override bool Equals (object obj)
 530                 {
 531                         return base.Equals (obj);
 532                 }
 533
 534                 public override int GetHashCode ()
 535                 {
 536                         return name.GetHashCode ();
 537                 }
 538
 539                 internal override int get_next_table_index (object obj, int table, bool inc)
 540                 {
 541                         return type.get_next_table_index (obj, table, inc);
 542                 }
 543
 544                 void ExtendArray<T> (ref T[] array, T elem) {
 545                         if (array == null) {
 546                                 array = new T [1];
 547                         } else {
 548                                 var newa = new T [array.Length + 1];
 549                                 Array.Copy (array, newa, array.Length);
 550                                 array = newa;
 551                         }
 552                         array [array.Length - 1] = elem;
 553                 }
 554
 555                 internal void set_override (MethodInfo mdecl)
 556                 {
 557                         ExtendArray<MethodInfo> (ref override_methods, mdecl);
 558                 }
 559
 560                 private void RejectIfCreated ()
 561                 {
 562                         if (type.is_created)
 563                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 564                 }
 565
 566                 private Exception NotSupported ()
 567                 {
 568                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 569                 }
 570
 571                 public override MethodInfo MakeGenericMethod (params Type [] typeArguments)
 572                 {
 573                         if (!IsGenericMethodDefinition)
 574                                 throw new InvalidOperationException ("Method is not a generic method definition");
 575                         if (typeArguments == null)
 576                                 throw new ArgumentNullException ("typeArguments");
 577                         if (generic_params.Length != typeArguments.Length)
 578                                 throw new ArgumentException ("Incorrect length", "typeArguments");
 579                         foreach (Type type in typeArguments) {
 580                                 if (type == null)
 581                                         throw new ArgumentNullException ("typeArguments");
 582                         }
 583
 584                         return new MethodOnTypeBuilderInst (this, typeArguments);
 585                 }
 586
 587                 public override bool IsGenericMethodDefinition {
 588                         get {
 589                                 return generic_params != null;
 590                         }
 591                 }
 592
 593                 public override bool IsGenericMethod {
 594                         get {
 595                                 return generic_params != null;
 596                         }
 597                 }
 598
 599                 public override MethodInfo GetGenericMethodDefinition ()
 600                 {
 601                         if (!IsGenericMethodDefinition)
 602                                 throw new InvalidOperationException ();
 603
 604                         return this;
 605                 }
 606
 607                 public override Type[] GetGenericArguments ()
 608                 {
 609                         if (generic_params == null)
 610                                 return null;
 611
 612                         Type[] result = new Type [generic_params.Length];
 613                         for (int i = 0; i < generic_params.Length; i++)
 614                                 result [i] = generic_params [i];
 615
 616                         return result;
 617                 }
 618
 619                 public GenericTypeParameterBuilder[] DefineGenericParameters (params string[] names)
 620                 {
 621                         if (names == null)
 622                                 throw new ArgumentNullException ("names");
 623                         if (names.Length == 0)
 624                                 throw new ArgumentException ("names");
 625
 626                         generic_params = new GenericTypeParameterBuilder [names.Length];
 627                         for (int i = 0; i < names.Length; i++) {
 628                                 string item = names [i];
 629                                 if (item == null)
 630                                         throw new ArgumentNullException ("names");
 631                                 generic_params [i] = new GenericTypeParameterBuilder (type, this, item, i);
 632                         }
 633
 634                         return generic_params;
 635                 }
 636
 637                 public void SetReturnType (Type returnType)
 638                 {
 639                         rtype = returnType;
 640                 }
 641
 642                 public void SetParameters (params Type[] parameterTypes)
 643                 {
 644                         if (parameterTypes != null) {
 645                                 for (int i = 0; i < parameterTypes.Length; ++i)
 646                                         if (parameterTypes [i] == null)
 647                                                 throw new ArgumentException ("Elements of the parameterTypes array cannot be null", "parameterTypes");
 648
 649                                 this.parameters = new Type [parameterTypes.Length];
 650                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
 651                         }
 652                 }
 653
 654                 public void SetSignature (Type returnType, Type[] returnTypeRequiredCustomModifiers, Type[] returnTypeOptionalCustomModifiers, Type[] parameterTypes, Type[][] parameterTypeRequiredCustomModifiers, Type[][] parameterTypeOptionalCustomModifiers)
 655                 {
 656                         SetReturnType (returnType);
 657                         SetParameters (parameterTypes);
 658                         this.returnModReq = returnTypeRequiredCustomModifiers;
 659                         this.returnModOpt = returnTypeOptionalCustomModifiers;
 660                         this.paramModReq = parameterTypeRequiredCustomModifiers;
 661                         this.paramModOpt = parameterTypeOptionalCustomModifiers;
 662                 }
 663
 664                 public override Module Module {
 665                         get {
 666                                 return GetModule ();
 667                         }
 668                 }
 669
 670                 void _MethodBuilder.GetIDsOfNames([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
 671                 {
 672                         throw new NotImplementedException ();
 673                 }
 674
 675                 void _MethodBuilder.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
 676                 {
 677                         throw new NotImplementedException ();
 678                 }
 679
 680                 void _MethodBuilder.GetTypeInfoCount (out uint pcTInfo)
 681                 {
 682                         throw new NotImplementedException ();
 683                 }
 684
 685                 void _MethodBuilder.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams, IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
 686                 {
 687                         throw new NotImplementedException ();
 688                 }
 689
 690                 public override ParameterInfo ReturnParameter {
 691                         get { return base.ReturnParameter; }
 692                 }
 693         }
 694 }
 695 #endif