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

   1 //
   2 // System.Reflection.Emit.DynamicMethod.cs
   3 //
   4 // Author:
   5 //   Paolo Molaro (lupus@ximian.com)
   6 //   Zoltan Varga (vargaz@freemail.hu)
   7 //
   8 // (C) 2003 Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34
  35 using System;
  36 using System.Reflection;
  37 using System.Reflection.Emit;
  38 using System.Globalization;
  39 using System.Runtime.CompilerServices;
  40 using System.Runtime.InteropServices;
  41
  42 namespace System.Reflection.Emit {
  43
  44         [ComVisible (true)]
  45         public sealed class DynamicMethod : MethodInfo {
  46
  47 #pragma warning disable 169, 414
  48                 #region Sync with reflection.h
  49                 private RuntimeMethodHandle mhandle;
  50                 private string name;
  51                 private Type returnType;
  52                 private Type[] parameters;
  53                 private MethodAttributes attributes;
  54                 private CallingConventions callingConvention;
  55                 private Module module;
  56                 private bool skipVisibility;
  57                 private bool init_locals = true;
  58                 private ILGenerator ilgen;
  59                 private int nrefs;
  60                 private object[] refs;
  61                 private IntPtr referenced_by;
  62                 private Type owner;
  63                 #endregion
  64 #pragma warning restore 169, 414
  65
  66                 private Delegate deleg;
  67                 private MonoMethod method;
  68                 private ParameterBuilder[] pinfo;
  69                 internal bool creating;
  70
  71                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  72                 }
  73
  74                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  75                 }
  76
  77                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  78                 }
  79
  80                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  81                 }
  82
  83                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, attributes, callingConvention, returnType, parameterTypes, owner, owner.Module, skipVisibility, false) {
  84                 }
  85
  86                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, attributes, callingConvention, returnType, parameterTypes, null, m, skipVisibility, false) {
  87                 }
  88
  89                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes) : this (name, returnType, parameterTypes, false) {
  90                 }
  91
  92                 [MonoTODO ("Visibility is not restricted")]
  93                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, bool restrictedSkipVisibility)
  94                         : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, null, null, restrictedSkipVisibility, true)
  95                 {
  96                 }
  97
  98                 DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type [] parameterTypes, Type owner, Module m, bool skipVisibility, bool anonHosted)
  99                 {
 100                         if (name == null)
 101                                 throw new ArgumentNullException ("name");
 102                         if (returnType == null)
 103                                 returnType = typeof (void);
 104                         if ((m == null) && !anonHosted)
 105                                 throw new ArgumentNullException ("m");
 106                         if (returnType.IsByRef)
 107                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
 108                         if (parameterTypes != null) {
 109                                 for (int i = 0; i < parameterTypes.Length; ++i)
 110                                         if (parameterTypes [i] == null)
 111                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
 112                         }
 113
 114                         if (m == null)
 115                                 m = AnonHostModuleHolder.anon_host_module;
 116
 117                         this.name = name;
 118                         this.attributes = attributes | MethodAttributes.Static;
 119                         this.callingConvention = callingConvention;
 120                         this.returnType = returnType;
 121                         this.parameters = parameterTypes;
 122                         this.owner = owner;
 123                         this.module = m;
 124                         this.skipVisibility = skipVisibility;
 125                 }
 126
 127                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 128                 private extern void create_dynamic_method (DynamicMethod m);
 129
 130                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 131                 private extern void destroy_dynamic_method (DynamicMethod m);
 132
 133                 private void CreateDynMethod () {
 134                         if (mhandle.Value == IntPtr.Zero) {
 135                                 if (ilgen == null || ilgen.ILOffset == 0)
 136                                         throw new InvalidOperationException ("Method '" + name + "' does not have a method body.");
 137
 138                                 ilgen.label_fixup ();
 139
 140                                 // Have to create all DynamicMethods referenced by this one
 141                                 try {
 142                                         // Used to avoid cycles
 143                                         creating = true;
 144                                         if (refs != null) {
 145                                                 for (int i = 0; i < refs.Length; ++i) {
 146                                                         if (refs [i] is DynamicMethod) {
 147                                                                 DynamicMethod m = (DynamicMethod)refs [i];
 148                                                                 if (!m.creating)
 149                                                                         m.CreateDynMethod ();
 150                                                         }
 151                                                 }
 152                                         }
 153                                 } finally {
 154                                         creating = false;
 155                                 }
 156
 157                                 create_dynamic_method (this);
 158                         }
 159                 }
 160
 161                 ~DynamicMethod ()
 162                 {
 163                         destroy_dynamic_method (this);
 164                 }
 165
 166                 [ComVisible (true)]
 167                 public Delegate CreateDelegate (Type delegateType)
 168                 {
 169                         if (delegateType == null)
 170                                 throw new ArgumentNullException ("delegateType");
 171                         if (deleg != null)
 172                                 return deleg;
 173
 174                         CreateDynMethod ();
 175
 176                         deleg = Delegate.CreateDelegate (delegateType, this);
 177                         return deleg;
 178                 }
 179
 180                 [ComVisible (true)]
 181                 public Delegate CreateDelegate (Type delegateType, object target)
 182                 {
 183                         if (delegateType == null)
 184                                 throw new ArgumentNullException ("delegateType");
 185
 186                         CreateDynMethod ();
 187
 188                         /* Can't cache the delegate since it is different for each target */
 189                         return Delegate.CreateDelegate (delegateType, target, this);
 190                 }
 191
 192                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string parameterName)
 193                 {
 194                         //
 195                         // Extension: Mono allows position == 0 for the return attribute
 196                         //
 197                         if ((position < 0) || (position > parameters.Length))
 198                                 throw new ArgumentOutOfRangeException ("position");
 199
 200                         RejectIfCreated ();
 201
 202                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, parameterName);
 203                         if (pinfo == null)
 204                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 205                         pinfo [position] = pb;
 206                         return pb;
 207                 }
 208
 209                 public override MethodInfo GetBaseDefinition () {
 210                         return this;
 211                 }
 212
 213                 [MonoTODO("Not implemented")]
 214                 public override object[] GetCustomAttributes (bool inherit) {
 215                         throw new NotImplementedException ();
 216                 }
 217
 218                 [MonoTODO("Not implemented")]
 219                 public override object[] GetCustomAttributes (Type attributeType,
 220                                                                                                           bool inherit) {
 221                         throw new NotImplementedException ();
 222                 }
 223
 224                 [MonoTODO("Not implemented")]
 225                 public DynamicILInfo GetDynamicILInfo () {
 226                         throw new NotImplementedException ();
 227                 }
 228
 229                 public ILGenerator GetILGenerator () {
 230                         return GetILGenerator (64);
 231                 }
 232
 233                 public ILGenerator GetILGenerator (int streamSize) {
 234                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 235                                  MethodImplAttributes.IL) ||
 236                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 237                                  MethodImplAttributes.Managed))
 238                                 throw new InvalidOperationException ("Method body should not exist.");
 239                         if (ilgen != null)
 240                                 return ilgen;
 241                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), streamSize);
 242                         return ilgen;
 243                 }
 244
 245                 public override MethodImplAttributes GetMethodImplementationFlags () {
 246                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 247                 }
 248
 249                 public override ParameterInfo[] GetParameters () {
 250                         if (parameters == null)
 251                                 return new ParameterInfo [0];
 252
 253                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 254                         for (int i = 0; i < parameters.Length; i++) {
 255                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 256                         }
 257                         return retval;
 258                 }
 259
 260                 internal override int GetParameterCount ()
 261                 {
 262                         return parameters == null ? 0 : parameters.Length;
 263                 }
 264
 265                 /*
 266                 public override object Invoke (object obj, object[] parameters) {
 267                         CreateDynMethod ();
 268                         if (method == null)
 269                                 method = new MonoMethod (mhandle);
 270                         return method.Invoke (obj, parameters);
 271                 }
 272                 */
 273
 274                 public override object Invoke (object obj, BindingFlags invokeAttr,
 275                                                                            Binder binder, object[] parameters,
 276                                                                            CultureInfo culture)
 277                 {
 278                         try {
 279                                 CreateDynMethod ();
 280                                 if (method == null)
 281                                         method = new MonoMethod (mhandle);
 282
 283                                 return method.Invoke (obj, parameters);
 284                         }
 285                         catch (MethodAccessException mae) {
 286                                 throw new TargetInvocationException ("Method cannot be invoked.", mae);
 287                         }
 288                 }
 289
 290                 [MonoTODO("Not implemented")]
 291                 public override bool IsDefined (Type attributeType, bool inherit) {
 292                         throw new NotImplementedException ();
 293                 }
 294
 295                 public override string ToString () {
 296                         string parms = String.Empty;
 297                         ParameterInfo[] p = GetParameters ();
 298                         for (int i = 0; i < p.Length; ++i) {
 299                                 if (i > 0)
 300                                         parms = parms + ", ";
 301                                 parms = parms + p [i].ParameterType.Name;
 302                         }
 303                         return ReturnType.Name+" "+Name+"("+parms+")";
 304                 }
 305
 306                 public override MethodAttributes Attributes {
 307                         get {
 308                                 return attributes;
 309                         }
 310                 }
 311
 312                 public override CallingConventions CallingConvention {
 313                         get {
 314                                 return callingConvention;
 315                         }
 316                 }
 317
 318                 public override Type DeclaringType {
 319                         get {
 320                                 return null;
 321                         }
 322                 }
 323
 324                 public bool InitLocals {
 325                         get {
 326                                 return init_locals;
 327                         }
 328                         set {
 329                                 init_locals = value;
 330                         }
 331                 }
 332
 333                 public override RuntimeMethodHandle MethodHandle {
 334                         get {
 335                                 return mhandle;
 336                         }
 337                 }
 338
 339                 public override Module Module {
 340                         get {
 341                                 return module;
 342                         }
 343                 }
 344
 345                 public override string Name {
 346                         get {
 347                                 return name;
 348                         }
 349                 }
 350
 351                 public override Type ReflectedType {
 352                         get {
 353                                 return null;
 354                         }
 355                 }
 356
 357                 [MonoTODO("Not implemented")]
 358                 public override ParameterInfo ReturnParameter {
 359                         get {
 360                                 throw new NotImplementedException ();
 361                         }
 362                 }
 363
 364                 public override Type ReturnType {
 365                         get {
 366                                 return returnType;
 367                         }
 368                 }
 369
 370                 [MonoTODO("Not implemented")]
 371                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 372                         get {
 373                                 throw new NotImplementedException ();
 374                         }
 375                 }
 376
 377 /*
 378                 public override int MetadataToken {
 379                         get {
 380                                 return 0;
 381                         }
 382                 }
 383 */
 384
 385                 private void RejectIfCreated () {
 386                         if (mhandle.Value != IntPtr.Zero)
 387                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 388                 }
 389
 390                 internal int AddRef (object reference) {
 391                         if (refs == null)
 392                                 refs = new object [4];
 393                         if (nrefs >= refs.Length - 1) {
 394                                 object [] new_refs = new object [refs.Length * 2];
 395                                 System.Array.Copy (refs, new_refs, refs.Length);
 396                                 refs = new_refs;
 397                         }
 398                         refs [nrefs] = reference;
 399                         /* Reserved by the runtime */
 400                         refs [nrefs + 1] = null;
 401                         nrefs += 2;
 402                         return nrefs - 1;
 403                 }
 404
 405                 // This class takes care of constructing the module in a thread safe manner
 406                 class AnonHostModuleHolder {
 407                         public static Module anon_host_module;
 408
 409                         static AnonHostModuleHolder () {
 410                                 AssemblyName aname = new AssemblyName ();
 411                                 aname.Name = "Anonymously Hosted DynamicMethods Assembly";
 412                                 AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly (aname, AssemblyBuilderAccess.Run);
 413
 414                                 anon_host_module = ab.GetManifestModule ();
 415                         }
 416                 }
 417         }
 418
 419         internal class DynamicMethodTokenGenerator : TokenGenerator {
 420
 421                 private DynamicMethod m;
 422
 423                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 424                         this.m = m;
 425                 }
 426
 427                 public int GetToken (string str) {
 428                         return m.AddRef (str);
 429                 }
 430
 431                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 432                         throw new InvalidOperationException ();
 433                 }
 434
 435                 public int GetToken (MemberInfo member) {
 436                         return m.AddRef (member);
 437                 }
 438
 439                 public int GetToken (SignatureHelper helper) {
 440                         return m.AddRef (helper);
 441                 }
 442         }
 443 }
 444