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 #if NET_2_0 || BOOTSTRAP_NET_2_0
  35
  36 using System;
  37 using System.Reflection;
  38 using System.Reflection.Emit;
  39 using System.Globalization;
  40 using System.Runtime.CompilerServices;
  41 using System.Runtime.InteropServices;
  42
  43 namespace System.Reflection.Emit {
  44
  45 #if NET_2_0
  46         [ComVisible (true)]
  47 #endif
  48         public sealed class DynamicMethod : MethodInfo {
  49
  50 #pragma warning disable 169, 414
  51                 #region Sync with reflection.h
  52                 private RuntimeMethodHandle mhandle;
  53                 private string name;
  54                 private Type returnType;
  55                 private Type[] parameters;
  56                 private MethodAttributes attributes;
  57                 private CallingConventions callingConvention;
  58                 private Module module;
  59                 private bool skipVisibility;
  60                 private bool init_locals = true;
  61                 private ILGenerator ilgen;
  62                 private int nrefs;
  63                 private object[] refs;
  64                 private IntPtr referenced_by;
  65                 private Type owner;
  66                 #endregion
  67 #pragma warning restore 169, 414
  68
  69                 private Delegate deleg;
  70                 private MonoMethod method;
  71                 private ParameterBuilder[] pinfo;
  72                 internal bool creating;
  73
  74                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  75                 }
  76
  77                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  78                 }
  79
  80                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  81                 }
  82
  83                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  84                 }
  85
  86                 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) {
  87                 }
  88
  89                 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) {
  90                 }
  91
  92                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes) : this (name, returnType, parameterTypes, false) {
  93                 }
  94
  95                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, bool restrictedSkipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, null, null, false, true) {
  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 || (ILGenerator.Mono_GetCurrentOffset (ilgen) == 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                 /*
 261                 public override object Invoke (object obj, object[] parameters) {
 262                         CreateDynMethod ();
 263                         if (method == null)
 264                                 method = new MonoMethod (mhandle);
 265                         return method.Invoke (obj, parameters);
 266                 }
 267                 */
 268
 269                 public override object Invoke (object obj, BindingFlags invokeAttr,
 270                                                                            Binder binder, object[] parameters,
 271                                                                            CultureInfo culture)
 272                 {
 273                         try {
 274                                 CreateDynMethod ();
 275                                 if (method == null)
 276                                         method = new MonoMethod (mhandle);
 277
 278                                 return method.Invoke (obj, parameters);
 279                         }
 280                         catch (MethodAccessException mae) {
 281                                 throw new TargetInvocationException ("Method cannot be invoked.", mae);
 282                         }
 283                 }
 284
 285                 [MonoTODO("Not implemented")]
 286                 public override bool IsDefined (Type attributeType, bool inherit) {
 287                         throw new NotImplementedException ();
 288                 }
 289
 290                 public override string ToString () {
 291                         string parms = String.Empty;
 292                         ParameterInfo[] p = GetParameters ();
 293                         for (int i = 0; i < p.Length; ++i) {
 294                                 if (i > 0)
 295                                         parms = parms + ", ";
 296                                 parms = parms + p [i].ParameterType.Name;
 297                         }
 298                         return ReturnType.Name+" "+Name+"("+parms+")";
 299                 }
 300
 301                 public override MethodAttributes Attributes {
 302                         get {
 303                                 return attributes;
 304                         }
 305                 }
 306
 307                 public override CallingConventions CallingConvention {
 308                         get {
 309                                 return callingConvention;
 310                         }
 311                 }
 312
 313                 public override Type DeclaringType {
 314                         get {
 315                                 return null;
 316                         }
 317                 }
 318
 319                 public bool InitLocals {
 320                         get {
 321                                 return init_locals;
 322                         }
 323                         set {
 324                                 init_locals = value;
 325                         }
 326                 }
 327
 328                 public override RuntimeMethodHandle MethodHandle {
 329                         get {
 330                                 return mhandle;
 331                         }
 332                 }
 333
 334                 public override Module Module {
 335                         get {
 336                                 return module;
 337                         }
 338                 }
 339
 340                 public override string Name {
 341                         get {
 342                                 return name;
 343                         }
 344                 }
 345
 346                 public override Type ReflectedType {
 347                         get {
 348                                 return null;
 349                         }
 350                 }
 351
 352                 [MonoTODO("Not implemented")]
 353                 public override ParameterInfo ReturnParameter {
 354                         get {
 355                                 throw new NotImplementedException ();
 356                         }
 357                 }
 358
 359                 public override Type ReturnType {
 360                         get {
 361                                 return returnType;
 362                         }
 363                 }
 364
 365                 [MonoTODO("Not implemented")]
 366                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 367                         get {
 368                                 throw new NotImplementedException ();
 369                         }
 370                 }
 371
 372 /*
 373                 public override int MetadataToken {
 374                         get {
 375                                 return 0;
 376                         }
 377                 }
 378 */
 379
 380                 private void RejectIfCreated () {
 381                         if (mhandle.Value != IntPtr.Zero)
 382                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 383                 }
 384
 385                 internal int AddRef (object reference) {
 386                         if (refs == null)
 387                                 refs = new object [4];
 388                         if (nrefs >= refs.Length - 1) {
 389                                 object [] new_refs = new object [refs.Length * 2];
 390                                 System.Array.Copy (refs, new_refs, refs.Length);
 391                                 refs = new_refs;
 392                         }
 393                         refs [nrefs] = reference;
 394                         /* Reserved by the runtime */
 395                         refs [nrefs + 1] = null;
 396                         nrefs += 2;
 397                         return nrefs - 1;
 398                 }
 399
 400                 // This class takes care of constructing the module in a thread safe manner
 401                 class AnonHostModuleHolder {
 402                         public static Module anon_host_module;
 403
 404                         static AnonHostModuleHolder () {
 405                                 AssemblyName aname = new AssemblyName ();
 406                                 aname.Name = "Anonymously Hosted DynamicMethods Assembly";
 407                                 AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly (aname, AssemblyBuilderAccess.Run);
 408
 409                                 anon_host_module = ab.GetManifestModule ();
 410                         }
 411                 }
 412         }
 413
 414         internal class DynamicMethodTokenGenerator : TokenGenerator {
 415
 416                 private DynamicMethod m;
 417
 418                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 419                         this.m = m;
 420                 }
 421
 422                 public int GetToken (string str) {
 423                         return m.AddRef (str);
 424                 }
 425
 426                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 427                         throw new InvalidOperationException ();
 428                 }
 429
 430                 public int GetToken (MemberInfo member) {
 431                         return m.AddRef (member);
 432                 }
 433
 434                 public int GetToken (SignatureHelper helper) {
 435                         return m.AddRef (helper);
 436                 }
 437         }
 438 }
 439
 440 #endif