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                 internal RuntimeMethodHandle MethodHandleInternal {
 142                         get {
 143                                 return mhandle;
 144                         }
 145                 }
 146
 147                 public override Type ReturnType {
 148                         get { return rtype; }
 149                 }
 150
 151                 public override Type ReflectedType {
 152                         get { return type; }
 153                 }
 154
 155                 public override Type DeclaringType {
 156                         get { return type; }
 157                 }
 158
 159                 public override string Name {
 160                         get { return name; }
 161                 }
 162
 163                 public override MethodAttributes Attributes {
 164                         get { return attrs; }
 165                 }
 166
 167                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 168                         get { return null; }
 169                 }
 170
 171                 public override CallingConventions CallingConvention {
 172                         get { return call_conv; }
 173                 }
 174
 175                 [MonoTODO("Not implemented")]
 176                 public string Signature {
 177                         get {
 178                                 throw new NotImplementedException ();
 179                         }
 180                 }
 181
 182                 /* Used by mcs */
 183                 internal bool BestFitMapping {
 184                         set {
 185                                 extra_flags = (uint) ((extra_flags & ~0x30) | (uint)(value ? 0x10 : 0x20));
 186                         }
 187                 }
 188
 189                 /* Used by mcs */
 190                 internal bool ThrowOnUnmappableChar {
 191                         set {
 192                                 extra_flags = (uint) ((extra_flags & ~0x3000) | (uint)(value ? 0x1000 : 0x2000));
 193                         }
 194                 }
 195
 196                 /* Used by mcs */
 197                 internal bool ExactSpelling {
 198                         set {
 199                                 extra_flags = (uint) ((extra_flags & ~0x01) | (uint)(value ? 0x01 : 0x00));
 200                         }
 201                 }
 202
 203                 /* Used by mcs */
 204                 internal bool SetLastError {
 205                         set {
 206                                 extra_flags = (uint) ((extra_flags & ~0x40) | (uint)(value ? 0x40 : 0x00));
 207                         }
 208                 }
 209
 210                 public MethodToken GetToken()
 211                 {
 212                         return new MethodToken(0x06000000 | table_idx);
 213                 }
 214
 215                 public override MethodInfo GetBaseDefinition()
 216                 {
 217                         return this;
 218                 }
 219
 220                 public override MethodImplAttributes GetMethodImplementationFlags()
 221                 {
 222                         return iattrs;
 223                 }
 224
 225                 public override ParameterInfo[] GetParameters()
 226                 {
 227                         if (!type.is_created)
 228                                 throw NotSupported ();
 229
 230                         return GetParametersInternal ();
 231                 }
 232
 233                 internal override ParameterInfo[] GetParametersInternal ()
 234                 {
 235                         if (parameters == null)
 236                                 return null;
 237
 238                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 239                         for (int i = 0; i < parameters.Length; i++) {
 240                                 retval [i] = ParameterInfo.New (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 241                         }
 242                         return retval;
 243                 }
 244
 245                 internal override int GetParametersCount ()
 246                 {
 247                         if (parameters == null)
 248                                 return 0;
 249
 250                         return parameters.Length;
 251                 }
 252
 253                 internal override Type GetParameterType (int pos) {
 254                         return parameters [pos];
 255                 }
 256
 257                 internal MethodBase RuntimeResolve () {
 258                         return type.RuntimeResolve ().GetMethod (this);
 259                 }
 260
 261                 public Module GetModule ()
 262                 {
 263                         return type.Module;
 264                 }
 265
 266                 public void CreateMethodBody (byte[] il, int count)
 267                 {
 268                         if ((il != null) && ((count < 0) || (count > il.Length)))
 269                                 throw new ArgumentOutOfRangeException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 270
 271                         if ((code != null) || type.is_created)
 272                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 273
 274                         if (il == null)
 275                                 code = null;
 276                         else {
 277                                 code = new byte [count];
 278                                 System.Array.Copy(il, code, count);
 279                         }
 280                 }
 281
 282                 public void SetMethodBody (byte[] il, int maxStack, byte[] localSignature,
 283                         IEnumerable<ExceptionHandler> exceptionHandlers, IEnumerable<int> tokenFixups)
 284                 {
 285                         var ilgen = GetILGenerator ();
 286                         ilgen.Init (il, maxStack, localSignature, exceptionHandlers, tokenFixups);
 287                 }
 288
 289                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
 290                 {
 291                         throw NotSupported ();
 292                 }
 293
 294                 public override bool IsDefined (Type attributeType, bool inherit)
 295                 {
 296                         throw NotSupported ();
 297                 }
 298
 299                 public override object[] GetCustomAttributes (bool inherit)
 300                 {
 301                         /*
 302                          * On MS.NET, this always returns not_supported, but we can't do this
 303                          * since there would be no way to obtain custom attributes of
 304                          * dynamically created ctors.
 305                          */
 306                         if (type.is_created)
 307                                 return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 308                         else
 309                                 throw NotSupported ();
 310                 }
 311
 312                 public override object[] GetCustomAttributes (Type attributeType, bool inherit)
 313                 {
 314                         if (type.is_created)
 315                                 return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 316                         else
 317                                 throw NotSupported ();
 318                 }
 319
 320                 public ILGenerator GetILGenerator ()
 321                 {
 322                         return GetILGenerator (64);
 323                 }
 324
 325                 public ILGenerator GetILGenerator (int size)
 326                 {
 327                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 328                                  MethodImplAttributes.IL) ||
 329                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 330                                  MethodImplAttributes.Managed))
 331                                 throw new InvalidOperationException ("Method body should not exist.");
 332                         if (ilgen != null)
 333                                 return ilgen;
 334                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 335                         return ilgen;
 336                 }
 337
 338                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 339                 {
 340                         RejectIfCreated ();
 341
 342                         //
 343                         // Extension: Mono allows position == 0 for the return attribute
 344                         //
 345                         if ((position < 0) || (position > parameters.Length))
 346                                 throw new ArgumentOutOfRangeException ("position");
 347
 348                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 349                         if (pinfo == null)
 350                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 351                         pinfo [position] = pb;
 352                         return pb;
 353                 }
 354
 355                 internal void check_override ()
 356                 {
 357                         if (override_methods != null) {
 358                                 foreach (var m in override_methods) {
 359                                         if (m.IsVirtual && !IsVirtual)
 360                                                 throw new TypeLoadException (String.Format("Method '{0}' override '{1}' but it is not virtual", name, m));
 361                                 }
 362                         }
 363                 }
 364
 365                 internal void fixup ()
 366                 {
 367                         if (((attrs & (MethodAttributes.Abstract | MethodAttributes.PinvokeImpl)) == 0) && ((iattrs & (MethodImplAttributes.Runtime | MethodImplAttributes.InternalCall)) == 0)) {
 368                                 // do not allow zero length method body on MS.NET 2.0 (and higher)
 369                                 if (((ilgen == null) || (ilgen.ILOffset == 0)) && (code == null || code.Length == 0))
 370                                         throw new InvalidOperationException (
 371                                                                              String.Format ("Method '{0}.{1}' does not have a method body.",
 372                                                                                             DeclaringType.FullName, Name));
 373                         }
 374                         if (ilgen != null)
 375                                 ilgen.label_fixup (this);
 376                 }
 377
 378                 internal void ResolveUserTypes () {
 379                         rtype = TypeBuilder.ResolveUserType (rtype);
 380                         TypeBuilder.ResolveUserTypes (parameters);
 381                         TypeBuilder.ResolveUserTypes (returnModReq);
 382                         TypeBuilder.ResolveUserTypes (returnModOpt);
 383                         if (paramModReq != null) {
 384                                 foreach (var types in paramModReq)
 385                                         TypeBuilder.ResolveUserTypes (types);
 386                         }
 387                         if (paramModOpt != null) {
 388                                 foreach (var types in paramModOpt)
 389                                         TypeBuilder.ResolveUserTypes (types);
 390                         }
 391                 }
 392
 393                 internal void FixupTokens (Dictionary<int, int> token_map, Dictionary<int, MemberInfo> member_map) {
 394                         if (ilgen != null)
 395                                 ilgen.FixupTokens (token_map, member_map);
 396                 }
 397
 398                 internal void GenerateDebugInfo (ISymbolWriter symbolWriter)
 399                 {
 400                         if (ilgen != null && ilgen.HasDebugInfo) {
 401                                 SymbolToken token = new SymbolToken (GetToken().Token);
 402                                 symbolWriter.OpenMethod (token);
 403                                 symbolWriter.SetSymAttribute (token, "__name", System.Text.Encoding.UTF8.GetBytes (Name));
 404                                 ilgen.GenerateDebugInfo (symbolWriter);
 405                                 symbolWriter.CloseMethod ();
 406                         }
 407                 }
 408
 409                 public void SetCustomAttribute (CustomAttributeBuilder customBuilder)
 410                 {
 411                         if (customBuilder == null)
 412                                 throw new ArgumentNullException ("customBuilder");
 413
 414                         switch (customBuilder.Ctor.ReflectedType.FullName) {
 415                                 case "System.Runtime.CompilerServices.MethodImplAttribute":
 416                                         byte[] data = customBuilder.Data;
 417                                         int impla; // the (stupid) ctor takes a short or an int ...
 418                                         impla = (int)data [2];
 419                                         impla |= ((int)data [3]) << 8;
 420                                         iattrs |= (MethodImplAttributes)impla;
 421                                         return;
 422
 423                                 case "System.Runtime.InteropServices.DllImportAttribute":
 424                                         CustomAttributeBuilder.CustomAttributeInfo attr = CustomAttributeBuilder.decode_cattr (customBuilder);
 425                                         bool preserveSig = true;
 426
 427                                         /*
 428                                          * It would be easier to construct a DllImportAttribute from
 429                                          * the custom attribute builder, but the DllImportAttribute
 430                                          * does not contain all the information required here, ie.
 431                                          * - some parameters, like BestFitMapping has three values
 432                                          *   ("on", "off", "missing"), but DllImportAttribute only
 433                                          *   contains two (on/off).
 434                                          * - PreserveSig is true by default, while it is false by
 435                                          *   default in DllImportAttribute.
 436                                          */
 437
 438                                         pi_dll = (string)attr.ctorArgs[0];
 439                                         if (pi_dll == null || pi_dll.Length == 0)
 440                                                 throw new ArgumentException ("DllName cannot be empty");
 441
 442                                         native_cc = System.Runtime.InteropServices.CallingConvention.Winapi;
 443
 444                                         for (int i = 0; i < attr.namedParamNames.Length; ++i) {
 445                                                 string name = attr.namedParamNames [i];
 446                                                 object value = attr.namedParamValues [i];
 447
 448                                                 if (name == "CallingConvention")
 449                                                         native_cc = (CallingConvention)value;
 450                                                 else if (name == "CharSet")
 451                                                         charset = (CharSet)value;
 452                                                 else if (name == "EntryPoint")
 453                                                         pi_entry = (string)value;
 454                                                 else if (name == "ExactSpelling")
 455                                                         ExactSpelling = (bool)value;
 456                                                 else if (name == "SetLastError")
 457                                                         SetLastError = (bool)value;
 458                                                 else if (name == "PreserveSig")
 459                                                         preserveSig = (bool)value;
 460                                         else if (name == "BestFitMapping")
 461                                                 BestFitMapping = (bool)value;
 462                                         else if (name == "ThrowOnUnmappableChar")
 463                                                 ThrowOnUnmappableChar = (bool)value;
 464                                         }
 465
 466                                         attrs |= MethodAttributes.PinvokeImpl;
 467                                         if (preserveSig)
 468                                                 iattrs |= MethodImplAttributes.PreserveSig;
 469                                         return;
 470
 471                                 case "System.Runtime.InteropServices.PreserveSigAttribute":
 472                                         iattrs |= MethodImplAttributes.PreserveSig;
 473                                         return;
 474                                 case "System.Runtime.CompilerServices.SpecialNameAttribute":
 475                                         attrs |= MethodAttributes.SpecialName;
 476                                         return;
 477                                 case "System.Security.SuppressUnmanagedCodeSecurityAttribute":
 478                                         attrs |= MethodAttributes.HasSecurity;
 479                                         break;
 480                         }
 481
 482                         if (cattrs != null) {
 483                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 484                                 cattrs.CopyTo (new_array, 0);
 485                                 new_array [cattrs.Length] = customBuilder;
 486                                 cattrs = new_array;
 487                         } else {
 488                                 cattrs = new CustomAttributeBuilder [1];
 489                                 cattrs [0] = customBuilder;
 490                         }
 491                 }
 492
 493                 [ComVisible (true)]
 494                 public void SetCustomAttribute (ConstructorInfo con, byte[] binaryAttribute)
 495                 {
 496                         if (con == null)
 497                                 throw new ArgumentNullException ("con");
 498                         if (binaryAttribute == null)
 499                                 throw new ArgumentNullException ("binaryAttribute");
 500                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 501                 }
 502
 503                 public void SetImplementationFlags (MethodImplAttributes attributes)
 504                 {
 505                         RejectIfCreated ();
 506                         iattrs = attributes;
 507                 }
 508
 509                 public void AddDeclarativeSecurity (SecurityAction action, PermissionSet pset)
 510                 {
 511 #if !MOBILE
 512                         if (pset == null)
 513                                 throw new ArgumentNullException ("pset");
 514                         if ((action == SecurityAction.RequestMinimum) ||
 515                                 (action == SecurityAction.RequestOptional) ||
 516                                 (action == SecurityAction.RequestRefuse))
 517                                 throw new ArgumentOutOfRangeException ("Request* values are not permitted", "action");
 518
 519                         RejectIfCreated ();
 520
 521                         if (permissions != null) {
 522                                 /* Check duplicate actions */
 523                                 foreach (RefEmitPermissionSet set in permissions)
 524                                         if (set.action == action)
 525                                                 throw new InvalidOperationException ("Multiple permission sets specified with the same SecurityAction.");
 526
 527                                 RefEmitPermissionSet[] new_array = new RefEmitPermissionSet [permissions.Length + 1];
 528                                 permissions.CopyTo (new_array, 0);
 529                                 permissions = new_array;
 530                         }
 531                         else
 532                                 permissions = new RefEmitPermissionSet [1];
 533
 534                         permissions [permissions.Length - 1] = new RefEmitPermissionSet (action, pset.ToXml ().ToString ());
 535                         attrs |= MethodAttributes.HasSecurity;
 536 #endif
 537                 }
 538
 539                 [Obsolete ("An alternate API is available: Emit the MarshalAs custom attribute instead.")]
 540                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 541                 {
 542                         RejectIfCreated ();
 543                         throw new NotImplementedException ();
 544                 }
 545
 546                 [MonoTODO]
 547                 public void SetSymCustomAttribute (string name, byte[] data)
 548                 {
 549                         RejectIfCreated ();
 550                         throw new NotImplementedException ();
 551                 }
 552
 553                 public override string ToString()
 554                 {
 555                         return "MethodBuilder [" + type.Name + "::" + name + "]";
 556                 }
 557
 558                 [MonoTODO]
 559                 public override bool Equals (object obj)
 560                 {
 561                         return base.Equals (obj);
 562                 }
 563
 564                 public override int GetHashCode ()
 565                 {
 566                         return name.GetHashCode ();
 567                 }
 568
 569                 internal override int get_next_table_index (object obj, int table, bool inc)
 570                 {
 571                         return type.get_next_table_index (obj, table, inc);
 572                 }
 573
 574                 void ExtendArray<T> (ref T[] array, T elem) {
 575                         if (array == null) {
 576                                 array = new T [1];
 577                         } else {
 578                                 var newa = new T [array.Length + 1];
 579                                 Array.Copy (array, newa, array.Length);
 580                                 array = newa;
 581                         }
 582                         array [array.Length - 1] = elem;
 583                 }
 584
 585                 internal void set_override (MethodInfo mdecl)
 586                 {
 587                         ExtendArray<MethodInfo> (ref override_methods, mdecl);
 588                 }
 589
 590                 private void RejectIfCreated ()
 591                 {
 592                         if (type.is_created)
 593                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 594                 }
 595
 596                 private Exception NotSupported ()
 597                 {
 598                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 599                 }
 600
 601                 public override MethodInfo MakeGenericMethod (params Type [] typeArguments)
 602                 {
 603                         if (!IsGenericMethodDefinition)
 604                                 throw new InvalidOperationException ("Method is not a generic method definition");
 605                         if (typeArguments == null)
 606                                 throw new ArgumentNullException ("typeArguments");
 607                         if (generic_params.Length != typeArguments.Length)
 608                                 throw new ArgumentException ("Incorrect length", "typeArguments");
 609                         foreach (Type type in typeArguments) {
 610                                 if (type == null)
 611                                         throw new ArgumentNullException ("typeArguments");
 612                         }
 613
 614                         return new MethodOnTypeBuilderInst (this, typeArguments);
 615                 }
 616
 617                 public override bool IsGenericMethodDefinition {
 618                         get {
 619                                 return generic_params != null;
 620                         }
 621                 }
 622
 623                 public override bool IsGenericMethod {
 624                         get {
 625                                 return generic_params != null;
 626                         }
 627                 }
 628
 629                 public override MethodInfo GetGenericMethodDefinition ()
 630                 {
 631                         if (!IsGenericMethodDefinition)
 632                                 throw new InvalidOperationException ();
 633
 634                         return this;
 635                 }
 636
 637                 public override Type[] GetGenericArguments ()
 638                 {
 639                         if (generic_params == null)
 640                                 return null;
 641
 642                         Type[] result = new Type [generic_params.Length];
 643                         for (int i = 0; i < generic_params.Length; i++)
 644                                 result [i] = generic_params [i];
 645
 646                         return result;
 647                 }
 648
 649                 public GenericTypeParameterBuilder[] DefineGenericParameters (params string[] names)
 650                 {
 651                         if (names == null)
 652                                 throw new ArgumentNullException ("names");
 653                         if (names.Length == 0)
 654                                 throw new ArgumentException ("names");
 655
 656                         generic_params = new GenericTypeParameterBuilder [names.Length];
 657                         for (int i = 0; i < names.Length; i++) {
 658                                 string item = names [i];
 659                                 if (item == null)
 660                                         throw new ArgumentNullException ("names");
 661                                 generic_params [i] = new GenericTypeParameterBuilder (type, this, item, i);
 662                         }
 663
 664                         return generic_params;
 665                 }
 666
 667                 public void SetReturnType (Type returnType)
 668                 {
 669                         rtype = returnType;
 670                 }
 671
 672                 public void SetParameters (params Type[] parameterTypes)
 673                 {
 674                         if (parameterTypes != null) {
 675                                 for (int i = 0; i < parameterTypes.Length; ++i)
 676                                         if (parameterTypes [i] == null)
 677                                                 throw new ArgumentException ("Elements of the parameterTypes array cannot be null", "parameterTypes");
 678
 679                                 this.parameters = new Type [parameterTypes.Length];
 680                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
 681                         }
 682                 }
 683
 684                 public void SetSignature (Type returnType, Type[] returnTypeRequiredCustomModifiers, Type[] returnTypeOptionalCustomModifiers, Type[] parameterTypes, Type[][] parameterTypeRequiredCustomModifiers, Type[][] parameterTypeOptionalCustomModifiers)
 685                 {
 686                         SetReturnType (returnType);
 687                         SetParameters (parameterTypes);
 688                         this.returnModReq = returnTypeRequiredCustomModifiers;
 689                         this.returnModOpt = returnTypeOptionalCustomModifiers;
 690                         this.paramModReq = parameterTypeRequiredCustomModifiers;
 691                         this.paramModOpt = parameterTypeOptionalCustomModifiers;
 692                 }
 693
 694                 public override Module Module {
 695                         get {
 696                                 return GetModule ();
 697                         }
 698                 }
 699
 700                 void _MethodBuilder.GetIDsOfNames([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
 701                 {
 702                         throw new NotImplementedException ();
 703                 }
 704
 705                 void _MethodBuilder.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
 706                 {
 707                         throw new NotImplementedException ();
 708                 }
 709
 710                 void _MethodBuilder.GetTypeInfoCount (out uint pcTInfo)
 711                 {
 712                         throw new NotImplementedException ();
 713                 }
 714
 715                 void _MethodBuilder.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams, IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
 716                 {
 717                         throw new NotImplementedException ();
 718                 }
 719
 720                 public override ParameterInfo ReturnParameter {
 721                         get { return base.ReturnParameter; }
 722                 }
 723         }
 724 }
 725 #endif