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                 [MonoTODO ("Visibility is not restricted")]
  96                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, bool restrictedSkipVisibility)
  97                         : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, null, null, restrictedSkipVisibility, true)
  98                 {
  99                 }
 100
 101                 DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type [] parameterTypes, Type owner, Module m, bool skipVisibility, bool anonHosted)
 102                 {
 103                         if (name == null)
 104                                 throw new ArgumentNullException ("name");
 105                         if (returnType == null)
 106                                 returnType = typeof (void);
 107                         if ((m == null) && !anonHosted)
 108                                 throw new ArgumentNullException ("m");
 109                         if (returnType.IsByRef)
 110                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
 111                         if (parameterTypes != null) {
 112                                 for (int i = 0; i < parameterTypes.Length; ++i)
 113                                         if (parameterTypes [i] == null)
 114                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
 115                         }
 116
 117                         if (m == null)
 118                                 m = AnonHostModuleHolder.anon_host_module;
 119
 120                         this.name = name;
 121                         this.attributes = attributes | MethodAttributes.Static;
 122                         this.callingConvention = callingConvention;
 123                         this.returnType = returnType;
 124                         this.parameters = parameterTypes;
 125                         this.owner = owner;
 126                         this.module = m;
 127                         this.skipVisibility = skipVisibility;
 128                 }
 129
 130                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 131                 private extern void create_dynamic_method (DynamicMethod m);
 132
 133                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 134                 private extern void destroy_dynamic_method (DynamicMethod m);
 135
 136                 private void CreateDynMethod () {
 137                         if (mhandle.Value == IntPtr.Zero) {
 138                                 if (ilgen == null || (ILGenerator.Mono_GetCurrentOffset (ilgen) == 0))
 139                                         throw new InvalidOperationException ("Method '" + name + "' does not have a method body.");
 140
 141                                 ilgen.label_fixup ();
 142
 143                                 // Have to create all DynamicMethods referenced by this one
 144                                 try {
 145                                         // Used to avoid cycles
 146                                         creating = true;
 147                                         if (refs != null) {
 148                                                 for (int i = 0; i < refs.Length; ++i) {
 149                                                         if (refs [i] is DynamicMethod) {
 150                                                                 DynamicMethod m = (DynamicMethod)refs [i];
 151                                                                 if (!m.creating)
 152                                                                         m.CreateDynMethod ();
 153                                                         }
 154                                                 }
 155                                         }
 156                                 } finally {
 157                                         creating = false;
 158                                 }
 159
 160                                 create_dynamic_method (this);
 161                         }
 162                 }
 163
 164                 ~DynamicMethod ()
 165                 {
 166                         destroy_dynamic_method (this);
 167                 }
 168
 169                 [ComVisible (true)]
 170                 public Delegate CreateDelegate (Type delegateType)
 171                 {
 172                         if (delegateType == null)
 173                                 throw new ArgumentNullException ("delegateType");
 174                         if (deleg != null)
 175                                 return deleg;
 176
 177                         CreateDynMethod ();
 178
 179                         deleg = Delegate.CreateDelegate (delegateType, this);
 180                         return deleg;
 181                 }
 182
 183                 [ComVisible (true)]
 184                 public Delegate CreateDelegate (Type delegateType, object target)
 185                 {
 186                         if (delegateType == null)
 187                                 throw new ArgumentNullException ("delegateType");
 188
 189                         CreateDynMethod ();
 190
 191                         /* Can't cache the delegate since it is different for each target */
 192                         return Delegate.CreateDelegate (delegateType, target, this);
 193                 }
 194
 195                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string parameterName)
 196                 {
 197                         //
 198                         // Extension: Mono allows position == 0 for the return attribute
 199                         //
 200                         if ((position < 0) || (position > parameters.Length))
 201                                 throw new ArgumentOutOfRangeException ("position");
 202
 203                         RejectIfCreated ();
 204
 205                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, parameterName);
 206                         if (pinfo == null)
 207                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 208                         pinfo [position] = pb;
 209                         return pb;
 210                 }
 211
 212                 public override MethodInfo GetBaseDefinition () {
 213                         return this;
 214                 }
 215
 216                 [MonoTODO("Not implemented")]
 217                 public override object[] GetCustomAttributes (bool inherit) {
 218                         throw new NotImplementedException ();
 219                 }
 220
 221                 [MonoTODO("Not implemented")]
 222                 public override object[] GetCustomAttributes (Type attributeType,
 223                                                                                                           bool inherit) {
 224                         throw new NotImplementedException ();
 225                 }
 226
 227                 [MonoTODO("Not implemented")]
 228                 public DynamicILInfo GetDynamicILInfo () {
 229                         throw new NotImplementedException ();
 230                 }
 231
 232                 public ILGenerator GetILGenerator () {
 233                         return GetILGenerator (64);
 234                 }
 235
 236                 public ILGenerator GetILGenerator (int streamSize) {
 237                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 238                                  MethodImplAttributes.IL) ||
 239                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 240                                  MethodImplAttributes.Managed))
 241                                 throw new InvalidOperationException ("Method body should not exist.");
 242                         if (ilgen != null)
 243                                 return ilgen;
 244                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), streamSize);
 245                         return ilgen;
 246                 }
 247
 248                 public override MethodImplAttributes GetMethodImplementationFlags () {
 249                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 250                 }
 251
 252                 public override ParameterInfo[] GetParameters () {
 253                         if (parameters == null)
 254                                 return new ParameterInfo [0];
 255
 256                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 257                         for (int i = 0; i < parameters.Length; i++) {
 258                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 259                         }
 260                         return retval;
 261                 }
 262
 263                 /*
 264                 public override object Invoke (object obj, object[] parameters) {
 265                         CreateDynMethod ();
 266                         if (method == null)
 267                                 method = new MonoMethod (mhandle);
 268                         return method.Invoke (obj, parameters);
 269                 }
 270                 */
 271
 272                 public override object Invoke (object obj, BindingFlags invokeAttr,
 273                                                                            Binder binder, object[] parameters,
 274                                                                            CultureInfo culture)
 275                 {
 276                         try {
 277                                 CreateDynMethod ();
 278                                 if (method == null)
 279                                         method = new MonoMethod (mhandle);
 280
 281                                 return method.Invoke (obj, parameters);
 282                         }
 283                         catch (MethodAccessException mae) {
 284                                 throw new TargetInvocationException ("Method cannot be invoked.", mae);
 285                         }
 286                 }
 287
 288                 [MonoTODO("Not implemented")]
 289                 public override bool IsDefined (Type attributeType, bool inherit) {
 290                         throw new NotImplementedException ();
 291                 }
 292
 293                 public override string ToString () {
 294                         string parms = String.Empty;
 295                         ParameterInfo[] p = GetParameters ();
 296                         for (int i = 0; i < p.Length; ++i) {
 297                                 if (i > 0)
 298                                         parms = parms + ", ";
 299                                 parms = parms + p [i].ParameterType.Name;
 300                         }
 301                         return ReturnType.Name+" "+Name+"("+parms+")";
 302                 }
 303
 304                 public override MethodAttributes Attributes {
 305                         get {
 306                                 return attributes;
 307                         }
 308                 }
 309
 310                 public override CallingConventions CallingConvention {
 311                         get {
 312                                 return callingConvention;
 313                         }
 314                 }
 315
 316                 public override Type DeclaringType {
 317                         get {
 318                                 return null;
 319                         }
 320                 }
 321
 322                 public bool InitLocals {
 323                         get {
 324                                 return init_locals;
 325                         }
 326                         set {
 327                                 init_locals = value;
 328                         }
 329                 }
 330
 331                 public override RuntimeMethodHandle MethodHandle {
 332                         get {
 333                                 return mhandle;
 334                         }
 335                 }
 336
 337                 public override Module Module {
 338                         get {
 339                                 return module;
 340                         }
 341                 }
 342
 343                 public override string Name {
 344                         get {
 345                                 return name;
 346                         }
 347                 }
 348
 349                 public override Type ReflectedType {
 350                         get {
 351                                 return null;
 352                         }
 353                 }
 354
 355                 [MonoTODO("Not implemented")]
 356                 public override ParameterInfo ReturnParameter {
 357                         get {
 358                                 throw new NotImplementedException ();
 359                         }
 360                 }
 361
 362                 public override Type ReturnType {
 363                         get {
 364                                 return returnType;
 365                         }
 366                 }
 367
 368                 [MonoTODO("Not implemented")]
 369                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 370                         get {
 371                                 throw new NotImplementedException ();
 372                         }
 373                 }
 374
 375 /*
 376                 public override int MetadataToken {
 377                         get {
 378                                 return 0;
 379                         }
 380                 }
 381 */
 382
 383                 private void RejectIfCreated () {
 384                         if (mhandle.Value != IntPtr.Zero)
 385                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 386                 }
 387
 388                 internal int AddRef (object reference) {
 389                         if (refs == null)
 390                                 refs = new object [4];
 391                         if (nrefs >= refs.Length - 1) {
 392                                 object [] new_refs = new object [refs.Length * 2];
 393                                 System.Array.Copy (refs, new_refs, refs.Length);
 394                                 refs = new_refs;
 395                         }
 396                         refs [nrefs] = reference;
 397                         /* Reserved by the runtime */
 398                         refs [nrefs + 1] = null;
 399                         nrefs += 2;
 400                         return nrefs - 1;
 401                 }
 402
 403                 // This class takes care of constructing the module in a thread safe manner
 404                 class AnonHostModuleHolder {
 405                         public static Module anon_host_module;
 406
 407                         static AnonHostModuleHolder () {
 408                                 AssemblyName aname = new AssemblyName ();
 409                                 aname.Name = "Anonymously Hosted DynamicMethods Assembly";
 410                                 AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly (aname, AssemblyBuilderAccess.Run);
 411
 412                                 anon_host_module = ab.GetManifestModule ();
 413                         }
 414                 }
 415         }
 416
 417         internal class DynamicMethodTokenGenerator : TokenGenerator {
 418
 419                 private DynamicMethod m;
 420
 421                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 422                         this.m = m;
 423                 }
 424
 425                 public int GetToken (string str) {
 426                         return m.AddRef (str);
 427                 }
 428
 429                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 430                         throw new InvalidOperationException ();
 431                 }
 432
 433                 public int GetToken (MemberInfo member) {
 434                         return m.AddRef (member);
 435                 }
 436
 437                 public int GetToken (SignatureHelper helper) {
 438                         return m.AddRef (helper);
 439                 }
 440         }
 441 }
 442
 443 #endif