mcs/class/System.Private.CoreLib/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 MONO_FEATURE_SRE
  34 using System;
  35 using System.Reflection;
  36 using System.Reflection.Emit;
  37 using System.Globalization;
  38 using System.Runtime.CompilerServices;
  39 using System.Runtime.InteropServices;
  40 using System.Diagnostics.SymbolStore;
  41 using System.Collections.Generic;
  42
  43 namespace System.Reflection.Emit
  44 {
  45         [StructLayout (LayoutKind.Sequential)]
  46         public sealed partial class MethodBuilder : MethodInfo
  47         {
  48 #pragma warning disable 169, 414
  49                 private RuntimeMethodHandle mhandle;
  50                 private Type rtype;
  51                 internal Type[] parameters;
  52                 private MethodAttributes attrs; /* It's used directly by MCS */
  53                 private MethodImplAttributes iattrs;
  54                 private string name;
  55                 private int table_idx;
  56                 private byte[] code;
  57                 private ILGenerator ilgen;
  58                 private TypeBuilder type;
  59                 internal ParameterBuilder[] pinfo;
  60                 private CustomAttributeBuilder[] cattrs;
  61                 private MethodInfo[] override_methods;
  62                 private string pi_dll;
  63                 private string pi_entry;
  64                 private CharSet charset;
  65                 private uint extra_flags; /* this encodes set_last_error etc */
  66                 private CallingConvention native_cc;
  67                 private CallingConventions call_conv;
  68                 private bool init_locals = true;
  69                 private IntPtr generic_container;
  70                 internal GenericTypeParameterBuilder[] generic_params;
  71                 private Type[] returnModReq;
  72                 private Type[] returnModOpt;
  73                 private Type[][] paramModReq;
  74                 private Type[][] paramModOpt;
  75                 private object permissions;
  76 #pragma warning restore 169, 414
  77                 RuntimeMethodInfo created;
  78
  79                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt)
  80                 {
  81                         this.name = name;
  82                         this.attrs = attributes;
  83                         this.call_conv = callingConvention;
  84                         this.rtype = returnType;
  85                         this.returnModReq = returnModReq;
  86                         this.returnModOpt = returnModOpt;
  87                         this.paramModReq = paramModReq;
  88                         this.paramModOpt = paramModOpt;
  89                         // The MSDN docs does not specify this, but the MS MethodBuilder
  90                         // appends a HasThis flag if the method is not static
  91                         if ((attributes & MethodAttributes.Static) == 0)
  92                                 this.call_conv |= CallingConventions.HasThis;
  93                         if (parameterTypes != null) {
  94                                 for (int i = 0; i < parameterTypes.Length; ++i)
  95                                         if (parameterTypes [i] == null)
  96                                                 throw new ArgumentException ("Elements of the parameterTypes array cannot be null", "parameterTypes");
  97
  98                                 this.parameters = new Type [parameterTypes.Length];
  99                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
 100                         }
 101                         type = tb;
 102                         table_idx = get_next_table_index (this, 0x06, 1);
 103
 104                         ((ModuleBuilder)tb.Module).RegisterToken (this, GetToken ().Token);
 105                 }
 106
 107                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
 108                                                                 CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt,
 109                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
 110                         : this (tb, name, attributes, callingConvention, returnType, returnModReq, returnModOpt, parameterTypes, paramModReq, paramModOpt)
 111                 {
 112                         pi_dll = dllName;
 113                         pi_entry = entryName;
 114                         native_cc = nativeCConv;
 115                         charset = nativeCharset;
 116                 }
 117
 118                 public override bool ContainsGenericParameters {
 119                         get { throw new NotSupportedException (); }
 120                 }
 121
 122                 public bool InitLocals {
 123                         get {return init_locals;}
 124                         set {init_locals = value;}
 125                 }
 126
 127                 internal TypeBuilder TypeBuilder {
 128                         get {return type;}
 129                 }
 130
 131                 public override RuntimeMethodHandle MethodHandle {
 132                         get {
 133                                 throw NotSupported ();
 134                         }
 135                 }
 136
 137                 internal RuntimeMethodHandle MethodHandleInternal {
 138                         get {
 139                                 return mhandle;
 140                         }
 141                 }
 142
 143                 public override Type ReturnType {
 144                         get { return rtype; }
 145                 }
 146
 147                 public override Type ReflectedType {
 148                         get { return type; }
 149                 }
 150
 151                 public override Type DeclaringType {
 152                         get { return type; }
 153                 }
 154
 155                 public override string Name {
 156                         get { return name; }
 157                 }
 158
 159                 public override MethodAttributes Attributes {
 160                         get { return attrs; }
 161                 }
 162
 163                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 164                         get { return null; }
 165                 }
 166
 167                 public override CallingConventions CallingConvention {
 168                         get { return call_conv; }
 169                 }
 170
 171                 // FIXME: "Not implemented"
 172                 public string Signature {
 173                         get {
 174                                 throw new NotImplementedException ();
 175                         }
 176                 }
 177
 178                 /* Used by mcs */
 179                 internal bool BestFitMapping {
 180                         set {
 181                                 extra_flags = (uint) ((extra_flags & ~0x30) | (uint)(value ? 0x10 : 0x20));
 182                         }
 183                 }
 184
 185                 /* Used by mcs */
 186                 internal bool ThrowOnUnmappableChar {
 187                         set {
 188                                 extra_flags = (uint) ((extra_flags & ~0x3000) | (uint)(value ? 0x1000 : 0x2000));
 189                         }
 190                 }
 191
 192                 /* Used by mcs */
 193                 internal bool ExactSpelling {
 194                         set {
 195                                 extra_flags = (uint) ((extra_flags & ~0x01) | (uint)(value ? 0x01 : 0x00));
 196                         }
 197                 }
 198
 199                 /* Used by mcs */
 200                 internal bool SetLastError {
 201                         set {
 202                                 extra_flags = (uint) ((extra_flags & ~0x40) | (uint)(value ? 0x40 : 0x00));
 203                         }
 204                 }
 205
 206                 public MethodToken GetToken()
 207                 {
 208                         return new MethodToken(0x06000000 | table_idx);
 209                 }
 210
 211                 public override MethodInfo GetBaseDefinition()
 212                 {
 213                         return this;
 214                 }
 215
 216                 public override MethodImplAttributes GetMethodImplementationFlags()
 217                 {
 218                         return iattrs;
 219                 }
 220
 221                 public override ParameterInfo[] GetParameters()
 222                 {
 223                         if (!type.is_created)
 224                                 throw NotSupported ();
 225
 226                         return GetParametersInternal ();
 227                 }
 228
 229                 internal override ParameterInfo[] GetParametersInternal ()
 230                 {
 231                         if (parameters == null)
 232                                 return null;
 233
 234                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 235                         for (int i = 0; i < parameters.Length; i++) {
 236                                 retval [i] = RuntimeParameterInfo.New (pinfo?[i + 1], parameters [i], this, i + 1);
 237                         }
 238                         return retval;
 239                 }
 240
 241                 internal override int GetParametersCount ()
 242                 {
 243                         if (parameters == null)
 244                                 return 0;
 245
 246                         return parameters.Length;
 247                 }
 248
 249                 internal override Type GetParameterType (int pos) {
 250                         return parameters [pos];
 251                 }
 252
 253                 internal MethodBase RuntimeResolve () {
 254                         return type.RuntimeResolve ().GetMethod (this);
 255                 }
 256
 257                 public Module GetModule ()
 258                 {
 259                         return type.Module;
 260                 }
 261
 262                 public void CreateMethodBody (byte[] il, int count)
 263                 {
 264                         if ((il != null) && ((count < 0) || (count > il.Length)))
 265                                 throw new ArgumentOutOfRangeException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 266
 267                         if ((code != null) || type.is_created)
 268                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 269
 270                         if (il == null)
 271                                 code = null;
 272                         else {
 273                                 code = new byte [count];
 274                                 System.Array.Copy(il, code, count);
 275                         }
 276                 }
 277
 278                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
 279                 {
 280                         throw NotSupported ();
 281                 }
 282
 283                 public override bool IsDefined (Type attributeType, bool inherit)
 284                 {
 285                         throw NotSupported ();
 286                 }
 287
 288                 public override object[] GetCustomAttributes (bool inherit)
 289                 {
 290                         /*
 291                          * On MS.NET, this always returns not_supported, but we can't do this
 292                          * since there would be no way to obtain custom attributes of
 293                          * dynamically created ctors.
 294                          */
 295                         if (type.is_created)
 296                                 return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 297                         else
 298                                 throw NotSupported ();
 299                 }
 300
 301                 public override object[] GetCustomAttributes (Type attributeType, bool inherit)
 302                 {
 303                         if (type.is_created)
 304                                 return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 305                         else
 306                                 throw NotSupported ();
 307                 }
 308
 309                 public ILGenerator GetILGenerator ()
 310                 {
 311                         return GetILGenerator (64);
 312                 }
 313
 314                 public ILGenerator GetILGenerator (int size)
 315                 {
 316                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 317                                  MethodImplAttributes.IL) ||
 318                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 319                                  MethodImplAttributes.Managed))
 320                                 throw new InvalidOperationException ("Method body should not exist.");
 321                         if (ilgen != null)
 322                                 return ilgen;
 323                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 324                         return ilgen;
 325                 }
 326
 327                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 328                 {
 329                         RejectIfCreated ();
 330
 331                         //
 332                         // Extension: Mono allows position == 0 for the return attribute
 333                         //
 334                         if ((position < 0) || parameters == null || (position > parameters.Length))
 335                                 throw new ArgumentOutOfRangeException ("position");
 336
 337                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 338                         if (pinfo == null)
 339                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 340                         pinfo [position] = pb;
 341                         return pb;
 342                 }
 343
 344                 internal void check_override ()
 345                 {
 346                         if (override_methods != null) {
 347                                 foreach (var m in override_methods) {
 348                                         if (m.IsVirtual && !IsVirtual)
 349                                                 throw new TypeLoadException (String.Format("Method '{0}' override '{1}' but it is not virtual", name, m));
 350                                 }
 351                         }
 352                 }
 353
 354                 internal void fixup ()
 355                 {
 356                         if (((attrs & (MethodAttributes.Abstract | MethodAttributes.PinvokeImpl)) == 0) && ((iattrs & (MethodImplAttributes.Runtime | MethodImplAttributes.InternalCall)) == 0)) {
 357                                 // do not allow zero length method body on MS.NET 2.0 (and higher)
 358                                 if (((ilgen == null) || (ilgen.ILOffset == 0)) && (code == null || code.Length == 0))
 359                                         throw new InvalidOperationException (
 360                                                                              String.Format ("Method '{0}.{1}' does not have a method body.",
 361                                                                                             DeclaringType.FullName, Name));
 362                         }
 363                         if (ilgen != null)
 364                                 ilgen.label_fixup (this);
 365                 }
 366
 367                 internal void ResolveUserTypes () {
 368                         rtype = TypeBuilder.ResolveUserType (rtype);
 369                         TypeBuilder.ResolveUserTypes (parameters);
 370                         TypeBuilder.ResolveUserTypes (returnModReq);
 371                         TypeBuilder.ResolveUserTypes (returnModOpt);
 372                         if (paramModReq != null) {
 373                                 foreach (var types in paramModReq)
 374                                         TypeBuilder.ResolveUserTypes (types);
 375                         }
 376                         if (paramModOpt != null) {
 377                                 foreach (var types in paramModOpt)
 378                                         TypeBuilder.ResolveUserTypes (types);
 379                         }
 380                 }
 381 /*
 382                 internal void GenerateDebugInfo (ISymbolWriter symbolWriter)
 383                 {
 384                         if (ilgen != null && ilgen.HasDebugInfo) {
 385                                 SymbolToken token = new SymbolToken (GetToken().Token);
 386                                 symbolWriter.OpenMethod (token);
 387                                 symbolWriter.SetSymAttribute (token, "__name", System.Text.Encoding.UTF8.GetBytes (Name));
 388                                 ilgen.GenerateDebugInfo (symbolWriter);
 389                                 symbolWriter.CloseMethod ();
 390                         }
 391                 }
 392 */
 393                 public void SetCustomAttribute (CustomAttributeBuilder customBuilder)
 394                 {
 395                         if (customBuilder == null)
 396                                 throw new ArgumentNullException ("customBuilder");
 397
 398                         switch (customBuilder.Ctor.ReflectedType.FullName) {
 399                                 case "System.Runtime.CompilerServices.MethodImplAttribute":
 400                                         byte[] data = customBuilder.Data;
 401                                         int impla; // the (stupid) ctor takes a short or an int ...
 402                                         impla = (int)data [2];
 403                                         impla |= ((int)data [3]) << 8;
 404                                         iattrs |= (MethodImplAttributes)impla;
 405                                         return;
 406
 407                                 case "System.Runtime.InteropServices.DllImportAttribute":
 408                                         CustomAttributeBuilder.CustomAttributeInfo attr = CustomAttributeBuilder.decode_cattr (customBuilder);
 409                                         bool preserveSig = true;
 410
 411                                         /*
 412                                          * It would be easier to construct a DllImportAttribute from
 413                                          * the custom attribute builder, but the DllImportAttribute
 414                                          * does not contain all the information required here, ie.
 415                                          * - some parameters, like BestFitMapping has three values
 416                                          *   ("on", "off", "missing"), but DllImportAttribute only
 417                                          *   contains two (on/off).
 418                                          * - PreserveSig is true by default, while it is false by
 419                                          *   default in DllImportAttribute.
 420                                          */
 421
 422                                         pi_dll = (string)attr.ctorArgs[0];
 423                                         if (pi_dll == null || pi_dll.Length == 0)
 424                                                 throw new ArgumentException ("DllName cannot be empty");
 425
 426                                         native_cc = System.Runtime.InteropServices.CallingConvention.Winapi;
 427
 428                                         for (int i = 0; i < attr.namedParamNames.Length; ++i) {
 429                                                 string name = attr.namedParamNames [i];
 430                                                 object value = attr.namedParamValues [i];
 431
 432                                                 if (name == "CallingConvention")
 433                                                         native_cc = (CallingConvention)value;
 434                                                 else if (name == "CharSet")
 435                                                         charset = (CharSet)value;
 436                                                 else if (name == "EntryPoint")
 437                                                         pi_entry = (string)value;
 438                                                 else if (name == "ExactSpelling")
 439                                                         ExactSpelling = (bool)value;
 440                                                 else if (name == "SetLastError")
 441                                                         SetLastError = (bool)value;
 442                                                 else if (name == "PreserveSig")
 443                                                         preserveSig = (bool)value;
 444                                         else if (name == "BestFitMapping")
 445                                                 BestFitMapping = (bool)value;
 446                                         else if (name == "ThrowOnUnmappableChar")
 447                                                 ThrowOnUnmappableChar = (bool)value;
 448                                         }
 449
 450                                         attrs |= MethodAttributes.PinvokeImpl;
 451                                         if (preserveSig)
 452                                                 iattrs |= MethodImplAttributes.PreserveSig;
 453                                         return;
 454
 455                                 case "System.Runtime.InteropServices.PreserveSigAttribute":
 456                                         iattrs |= MethodImplAttributes.PreserveSig;
 457                                         return;
 458                                 case "System.Runtime.CompilerServices.SpecialNameAttribute":
 459                                         attrs |= MethodAttributes.SpecialName;
 460                                         return;
 461                                 case "System.Security.SuppressUnmanagedCodeSecurityAttribute":
 462                                         attrs |= MethodAttributes.HasSecurity;
 463                                         break;
 464                         }
 465
 466                         if (cattrs != null) {
 467                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 468                                 cattrs.CopyTo (new_array, 0);
 469                                 new_array [cattrs.Length] = customBuilder;
 470                                 cattrs = new_array;
 471                         } else {
 472                                 cattrs = new CustomAttributeBuilder [1];
 473                                 cattrs [0] = customBuilder;
 474                         }
 475                 }
 476
 477                 [ComVisible (true)]
 478                 public void SetCustomAttribute (ConstructorInfo con, byte[] binaryAttribute)
 479                 {
 480                         if (con == null)
 481                                 throw new ArgumentNullException ("con");
 482                         if (binaryAttribute == null)
 483                                 throw new ArgumentNullException ("binaryAttribute");
 484                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 485                 }
 486
 487                 public void SetImplementationFlags (MethodImplAttributes attributes)
 488                 {
 489                         RejectIfCreated ();
 490                         iattrs = attributes;
 491                 }
 492
 493                 [Obsolete ("An alternate API is available: Emit the MarshalAs custom attribute instead.")]
 494                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 495                 {
 496                         RejectIfCreated ();
 497                         throw new NotImplementedException ();
 498                 }
 499
 500                 // FIXME:
 501                 public void SetSymCustomAttribute (string name, byte[] data)
 502                 {
 503                         RejectIfCreated ();
 504                         throw new NotImplementedException ();
 505                 }
 506
 507                 public override string ToString()
 508                 {
 509                         return "MethodBuilder [" + type.Name + "::" + name + "]";
 510                 }
 511
 512                 // FIXME:
 513                 public override bool Equals (object obj)
 514                 {
 515                         return base.Equals (obj);
 516                 }
 517
 518                 public override int GetHashCode ()
 519                 {
 520                         return name.GetHashCode ();
 521                 }
 522
 523                 internal override int get_next_table_index (object obj, int table, int count)
 524                 {
 525                         return type.get_next_table_index (obj, table, count);
 526                 }
 527
 528                 void ExtendArray<T> (ref T[] array, T elem) {
 529                         if (array == null) {
 530                                 array = new T [1];
 531                         } else {
 532                                 var newa = new T [array.Length + 1];
 533                                 Array.Copy (array, newa, array.Length);
 534                                 array = newa;
 535                         }
 536                         array [array.Length - 1] = elem;
 537                 }
 538
 539                 internal void set_override (MethodInfo mdecl)
 540                 {
 541                         ExtendArray<MethodInfo> (ref override_methods, mdecl);
 542                 }
 543
 544                 private void RejectIfCreated ()
 545                 {
 546                         if (type.is_created)
 547                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 548                 }
 549
 550                 private Exception NotSupported ()
 551                 {
 552                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 553                 }
 554
 555                 public override MethodInfo MakeGenericMethod (params Type [] typeArguments)
 556                 {
 557                         if (!IsGenericMethodDefinition)
 558                                 throw new InvalidOperationException ("Method is not a generic method definition");
 559                         if (typeArguments == null)
 560                                 throw new ArgumentNullException ("typeArguments");
 561                         if (generic_params.Length != typeArguments.Length)
 562                                 throw new ArgumentException ("Incorrect length", "typeArguments");
 563                         foreach (Type type in typeArguments) {
 564                                 if (type == null)
 565                                         throw new ArgumentNullException ("typeArguments");
 566                         }
 567
 568                         return new MethodOnTypeBuilderInst (this, typeArguments);
 569                 }
 570
 571                 public override bool IsGenericMethodDefinition {
 572                         get {
 573                                 return generic_params != null;
 574                         }
 575                 }
 576
 577                 public override bool IsGenericMethod {
 578                         get {
 579                                 return generic_params != null;
 580                         }
 581                 }
 582
 583                 public override MethodInfo GetGenericMethodDefinition ()
 584                 {
 585                         if (!IsGenericMethodDefinition)
 586                                 throw new InvalidOperationException ();
 587
 588                         return this;
 589                 }
 590
 591                 public override Type[] GetGenericArguments ()
 592                 {
 593                         if (generic_params == null)
 594                                 return null;
 595
 596                         Type[] result = new Type [generic_params.Length];
 597                         for (int i = 0; i < generic_params.Length; i++)
 598                                 result [i] = generic_params [i];
 599
 600                         return result;
 601                 }
 602
 603                 public GenericTypeParameterBuilder[] DefineGenericParameters (params string[] names)
 604                 {
 605                         if (names == null)
 606                                 throw new ArgumentNullException ("names");
 607                         if (names.Length == 0)
 608                                 throw new ArgumentException ("names");
 609
 610                         generic_params = new GenericTypeParameterBuilder [names.Length];
 611                         for (int i = 0; i < names.Length; i++) {
 612                                 string item = names [i];
 613                                 if (item == null)
 614                                         throw new ArgumentNullException ("names");
 615                                 generic_params [i] = new GenericTypeParameterBuilder (type, this, item, i);
 616                         }
 617
 618                         return generic_params;
 619                 }
 620
 621                 public void SetReturnType (Type returnType)
 622                 {
 623                         rtype = returnType;
 624                 }
 625
 626                 public void SetParameters (params Type[] parameterTypes)
 627                 {
 628                         if (parameterTypes != null) {
 629                                 for (int i = 0; i < parameterTypes.Length; ++i)
 630                                         if (parameterTypes [i] == null)
 631                                                 throw new ArgumentException ("Elements of the parameterTypes array cannot be null", "parameterTypes");
 632
 633                                 this.parameters = new Type [parameterTypes.Length];
 634                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
 635                         }
 636                 }
 637
 638                 public void SetSignature (Type returnType, Type[] returnTypeRequiredCustomModifiers, Type[] returnTypeOptionalCustomModifiers, Type[] parameterTypes, Type[][] parameterTypeRequiredCustomModifiers, Type[][] parameterTypeOptionalCustomModifiers)
 639                 {
 640                         SetReturnType (returnType);
 641                         SetParameters (parameterTypes);
 642                         this.returnModReq = returnTypeRequiredCustomModifiers;
 643                         this.returnModOpt = returnTypeOptionalCustomModifiers;
 644                         this.paramModReq = parameterTypeRequiredCustomModifiers;
 645                         this.paramModOpt = parameterTypeOptionalCustomModifiers;
 646                 }
 647
 648                 public override Module Module {
 649                         get {
 650                                 return GetModule ();
 651                         }
 652                 }
 653
 654                 public override ParameterInfo ReturnParameter {
 655                         get {
 656                                 if (!type.is_created)
 657                                         throw new InvalidOperationException (SR.InvalidOperation_TypeNotCreated);
 658                                 if (created == null)
 659                                         created = (RuntimeMethodInfo)MethodBase.GetMethodFromHandle (mhandle);
 660                                 return created.ReturnParameter;
 661                         }
 662                 }
 663         }
 664
 665     [StructLayout(LayoutKind.Sequential)]
 666     readonly struct ExceptionHandler : IEquatable<ExceptionHandler>
 667     {
 668         internal readonly int m_exceptionClass;
 669         internal readonly int m_tryStartOffset;
 670         internal readonly int m_tryEndOffset;
 671         internal readonly int m_filterOffset;
 672         internal readonly int m_handlerStartOffset;
 673         internal readonly int m_handlerEndOffset;
 674         internal readonly ExceptionHandlingClauseOptions m_kind;
 675
 676         public int ExceptionTypeToken
 677         {
 678             get { return m_exceptionClass; }
 679         }
 680
 681         public int TryOffset
 682         {
 683             get { return m_tryStartOffset; }
 684         }
 685
 686         public int TryLength
 687         {
 688             get { return m_tryEndOffset - m_tryStartOffset; }
 689         }
 690
 691         public int FilterOffset
 692         {
 693             get { return m_filterOffset; }
 694         }
 695
 696         public int HandlerOffset
 697         {
 698             get { return m_handlerStartOffset; }
 699         }
 700
 701         public int HandlerLength
 702         {
 703             get { return m_handlerEndOffset - m_handlerStartOffset; }
 704         }
 705
 706         public ExceptionHandlingClauseOptions Kind
 707         {
 708             get { return m_kind; }
 709         }
 710
 711         internal ExceptionHandler(int tryStartOffset, int tryEndOffset, int filterOffset, int handlerStartOffset, int handlerEndOffset,
 712             int kind, int exceptionTypeToken)
 713         {
 714             m_tryStartOffset = tryStartOffset;
 715             m_tryEndOffset = tryEndOffset;
 716             m_filterOffset = filterOffset;
 717             m_handlerStartOffset = handlerStartOffset;
 718             m_handlerEndOffset = handlerEndOffset;
 719             m_kind = (ExceptionHandlingClauseOptions)kind;
 720             m_exceptionClass = exceptionTypeToken;
 721         }
 722
 723         private static bool IsValidKind(ExceptionHandlingClauseOptions kind)
 724         {
 725             switch (kind)
 726             {
 727                 case ExceptionHandlingClauseOptions.Clause:
 728                 case ExceptionHandlingClauseOptions.Filter:
 729                 case ExceptionHandlingClauseOptions.Finally:
 730                 case ExceptionHandlingClauseOptions.Fault:
 731                     return true;
 732
 733                 default:
 734                     return false;
 735             }
 736         }
 737
 738         public override int GetHashCode()
 739         {
 740             return m_exceptionClass ^ m_tryStartOffset ^ m_tryEndOffset ^ m_filterOffset ^ m_handlerStartOffset ^ m_handlerEndOffset ^ (int)m_kind;
 741         }
 742
 743         public override bool Equals(Object obj)
 744         {
 745             return obj is ExceptionHandler && Equals((ExceptionHandler)obj);
 746         }
 747
 748         public bool Equals(ExceptionHandler other)
 749         {
 750             return
 751                 other.m_exceptionClass == m_exceptionClass &&
 752                 other.m_tryStartOffset == m_tryStartOffset &&
 753                 other.m_tryEndOffset == m_tryEndOffset &&
 754                 other.m_filterOffset == m_filterOffset &&
 755                 other.m_handlerStartOffset == m_handlerStartOffset &&
 756                 other.m_handlerEndOffset == m_handlerEndOffset &&
 757                 other.m_kind == m_kind;
 758         }
 759
 760         public static bool operator ==(ExceptionHandler left, ExceptionHandler right)
 761         {
 762             return left.Equals(right);
 763         }
 764
 765         public static bool operator !=(ExceptionHandler left, ExceptionHandler right)
 766         {
 767             return !left.Equals(right);
 768         }
 769     }
 770 }
 771 #endif