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         [StructLayout (LayoutKind.Sequential)]
  46         public sealed class DynamicMethod : MethodInfo {
  47
  48 #pragma warning disable 169, 414, 649
  49                 #region Sync with reflection.h
  50                 private RuntimeMethodHandle mhandle;
  51                 private string name;
  52                 private Type returnType;
  53                 private Type[] parameters;
  54                 private MethodAttributes attributes;
  55                 private CallingConventions callingConvention;
  56                 private Module module;
  57                 private bool skipVisibility;
  58                 private bool init_locals = true;
  59                 private ILGenerator ilgen;
  60                 private int nrefs;
  61                 private object[] refs;
  62                 private IntPtr referenced_by;
  63                 private Type owner;
  64                 #endregion
  65 #pragma warning restore 169, 414, 649
  66
  67                 private Delegate deleg;
  68                 private MonoMethod method;
  69                 private ParameterBuilder[] pinfo;
  70                 internal bool creating;
  71                 private DynamicILInfo il_info;
  72
  73                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  74                 }
  75
  76                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  77                 }
  78
  79                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  80                 }
  81
  82                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  83                 }
  84
  85                 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) {
  86                 }
  87
  88                 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) {
  89                 }
  90
  91                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes) : this (name, returnType, parameterTypes, false) {
  92                 }
  93
  94                 [MonoTODO ("Visibility is not restricted")]
  95                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, bool restrictedSkipVisibility)
  96                         : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, null, null, restrictedSkipVisibility, true)
  97                 {
  98                 }
  99
 100                 DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type [] parameterTypes, Type owner, Module m, bool skipVisibility, bool anonHosted)
 101                 {
 102                         if (name == null)
 103                                 throw new ArgumentNullException ("name");
 104                         if (returnType == null)
 105                                 returnType = typeof (void);
 106                         if ((m == null) && !anonHosted)
 107                                 throw new ArgumentNullException ("m");
 108                         if (returnType.IsByRef)
 109                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
 110                         if (parameterTypes != null) {
 111                                 for (int i = 0; i < parameterTypes.Length; ++i)
 112                                         if (parameterTypes [i] == null)
 113                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
 114                         }
 115
 116                         if (m == null)
 117                                 m = AnonHostModuleHolder.AnonHostModule;
 118
 119                         this.name = name;
 120                         this.attributes = attributes | MethodAttributes.Static;
 121                         this.callingConvention = callingConvention;
 122                         this.returnType = returnType;
 123                         this.parameters = parameterTypes;
 124                         this.owner = owner;
 125                         this.module = m;
 126                         this.skipVisibility = skipVisibility;
 127                 }
 128
 129                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 130                 private extern void create_dynamic_method (DynamicMethod m);
 131
 132                 private void CreateDynMethod () {
 133                         if (mhandle.Value == IntPtr.Zero) {
 134                                 if (ilgen == null || ilgen.ILOffset == 0)
 135                                         throw new InvalidOperationException ("Method '" + name + "' does not have a method body.");
 136
 137                                 ilgen.label_fixup ();
 138
 139                                 // Have to create all DynamicMethods referenced by this one
 140                                 try {
 141                                         // Used to avoid cycles
 142                                         creating = true;
 143                                         if (refs != null) {
 144                                                 for (int i = 0; i < refs.Length; ++i) {
 145                                                         if (refs [i] is DynamicMethod) {
 146                                                                 DynamicMethod m = (DynamicMethod)refs [i];
 147                                                                 if (!m.creating)
 148                                                                         m.CreateDynMethod ();
 149                                                         }
 150                                                 }
 151                                         }
 152                                 } finally {
 153                                         creating = false;
 154                                 }
 155
 156                                 create_dynamic_method (this);
 157                         }
 158                 }
 159
 160                 [ComVisible (true)]
 161                 public Delegate CreateDelegate (Type delegateType)
 162                 {
 163                         if (delegateType == null)
 164                                 throw new ArgumentNullException ("delegateType");
 165                         if (deleg != null)
 166                                 return deleg;
 167
 168                         CreateDynMethod ();
 169
 170                         deleg = Delegate.CreateDelegate (delegateType, this);
 171                         return deleg;
 172                 }
 173
 174                 [ComVisible (true)]
 175                 public Delegate CreateDelegate (Type delegateType, object target)
 176                 {
 177                         if (delegateType == null)
 178                                 throw new ArgumentNullException ("delegateType");
 179
 180                         CreateDynMethod ();
 181
 182                         /* Can't cache the delegate since it is different for each target */
 183                         return Delegate.CreateDelegate (delegateType, target, this);
 184                 }
 185
 186                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string parameterName)
 187                 {
 188                         //
 189                         // Extension: Mono allows position == 0 for the return attribute
 190                         //
 191                         if ((position < 0) || (position > parameters.Length))
 192                                 throw new ArgumentOutOfRangeException ("position");
 193
 194                         RejectIfCreated ();
 195
 196                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, parameterName);
 197                         if (pinfo == null)
 198                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 199                         pinfo [position] = pb;
 200                         return pb;
 201                 }
 202
 203                 public override MethodInfo GetBaseDefinition () {
 204                         return this;
 205                 }
 206
 207                 [MonoTODO("Not implemented")]
 208                 public override object[] GetCustomAttributes (bool inherit) {
 209                         throw new NotImplementedException ();
 210                 }
 211
 212                 [MonoTODO("Not implemented")]
 213                 public override object[] GetCustomAttributes (Type attributeType,
 214                                                                                                           bool inherit) {
 215                         throw new NotImplementedException ();
 216                 }
 217
 218                 public DynamicILInfo GetDynamicILInfo () {
 219                         if (il_info == null)
 220                                 il_info = new DynamicILInfo (this);
 221                         return il_info;
 222                 }
 223
 224                 public ILGenerator GetILGenerator () {
 225                         return GetILGenerator (64);
 226                 }
 227
 228                 public ILGenerator GetILGenerator (int streamSize) {
 229                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 230                                  MethodImplAttributes.IL) ||
 231                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 232                                  MethodImplAttributes.Managed))
 233                                 throw new InvalidOperationException ("Method body should not exist.");
 234                         if (ilgen != null)
 235                                 return ilgen;
 236                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), streamSize);
 237                         return ilgen;
 238                 }
 239
 240                 public override MethodImplAttributes GetMethodImplementationFlags () {
 241                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 242                 }
 243
 244                 public override ParameterInfo[] GetParameters () {
 245                         if (parameters == null)
 246                                 return new ParameterInfo [0];
 247
 248                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 249                         for (int i = 0; i < parameters.Length; i++) {
 250                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 251                         }
 252                         return retval;
 253                 }
 254
 255                 internal override int GetParameterCount ()
 256                 {
 257                         return parameters == null ? 0 : parameters.Length;
 258                 }
 259
 260                 internal override Type GetParameterType (int pos) {
 261                         return parameters [pos];
 262                 }
 263
 264                 /*
 265                 public override object Invoke (object obj, object[] parameters) {
 266                         CreateDynMethod ();
 267                         if (method == null)
 268                                 method = new MonoMethod (mhandle);
 269                         return method.Invoke (obj, parameters);
 270                 }
 271                 */
 272
 273                 public override object Invoke (object obj, BindingFlags invokeAttr,
 274                                                                            Binder binder, object[] parameters,
 275                                                                            CultureInfo culture)
 276                 {
 277                         try {
 278                                 CreateDynMethod ();
 279                                 if (method == null)
 280                                         method = new MonoMethod (mhandle);
 281
 282                                 return method.Invoke (obj, parameters);
 283                         }
 284                         catch (MethodAccessException mae) {
 285                                 throw new TargetInvocationException ("Method cannot be invoked.", mae);
 286                         }
 287                 }
 288
 289                 [MonoTODO("Not implemented")]
 290                 public override bool IsDefined (Type attributeType, bool inherit) {
 291                         throw new NotImplementedException ();
 292                 }
 293
 294                 public override string ToString () {
 295                         string parms = String.Empty;
 296                         ParameterInfo[] p = GetParameters ();
 297                         for (int i = 0; i < p.Length; ++i) {
 298                                 if (i > 0)
 299                                         parms = parms + ", ";
 300                                 parms = parms + p [i].ParameterType.Name;
 301                         }
 302                         return ReturnType.Name+" "+Name+"("+parms+")";
 303                 }
 304
 305                 public override MethodAttributes Attributes {
 306                         get {
 307                                 return attributes;
 308                         }
 309                 }
 310
 311                 public override CallingConventions CallingConvention {
 312                         get {
 313                                 return callingConvention;
 314                         }
 315                 }
 316
 317                 public override Type DeclaringType {
 318                         get {
 319                                 return null;
 320                         }
 321                 }
 322
 323                 public bool InitLocals {
 324                         get {
 325                                 return init_locals;
 326                         }
 327                         set {
 328                                 init_locals = value;
 329                         }
 330                 }
 331
 332                 public override RuntimeMethodHandle MethodHandle {
 333                         get {
 334                                 return mhandle;
 335                         }
 336                 }
 337
 338                 public override Module Module {
 339                         get {
 340                                 return module;
 341                         }
 342                 }
 343
 344                 public override string Name {
 345                         get {
 346                                 return name;
 347                         }
 348                 }
 349
 350                 public override Type ReflectedType {
 351                         get {
 352                                 return null;
 353                         }
 354                 }
 355
 356                 [MonoTODO("Not implemented")]
 357                 public override ParameterInfo ReturnParameter {
 358                         get {
 359                                 throw new NotImplementedException ();
 360                         }
 361                 }
 362
 363                 public override Type ReturnType {
 364                         get {
 365                                 return returnType;
 366                         }
 367                 }
 368
 369                 [MonoTODO("Not implemented")]
 370                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 371                         get {
 372                                 throw new NotImplementedException ();
 373                         }
 374                 }
 375
 376 /*
 377                 public override int MetadataToken {
 378                         get {
 379                                 return 0;
 380                         }
 381                 }
 382 */
 383
 384                 private void RejectIfCreated () {
 385                         if (mhandle.Value != IntPtr.Zero)
 386                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 387                 }
 388
 389                 internal int AddRef (object reference) {
 390                         if (refs == null)
 391                                 refs = new object [4];
 392                         if (nrefs >= refs.Length - 1) {
 393                                 object [] new_refs = new object [refs.Length * 2];
 394                                 System.Array.Copy (refs, new_refs, refs.Length);
 395                                 refs = new_refs;
 396                         }
 397                         refs [nrefs] = reference;
 398                         /* Reserved by the runtime */
 399                         refs [nrefs + 1] = null;
 400                         nrefs += 2;
 401                         return nrefs - 1;
 402                 }
 403
 404                 // This class takes care of constructing the module in a thread safe manner
 405                 class AnonHostModuleHolder {
 406                         public static Module anon_host_module;
 407
 408                         static AnonHostModuleHolder () {
 409                                 AssemblyName aname = new AssemblyName ();
 410                                 aname.Name = "Anonymously Hosted DynamicMethods Assembly";
 411                                 AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly (aname, AssemblyBuilderAccess.Run);
 412
 413                                 anon_host_module = ab.GetManifestModule ();
 414                         }
 415
 416                         public static Module AnonHostModule {
 417                                 get {
 418                                         return anon_host_module;
 419                                 }
 420                         }
 421                 }
 422         }
 423
 424         internal class DynamicMethodTokenGenerator : TokenGenerator {
 425
 426                 private DynamicMethod m;
 427
 428                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 429                         this.m = m;
 430                 }
 431
 432                 public int GetToken (string str) {
 433                         return m.AddRef (str);
 434                 }
 435
 436                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 437                         throw new InvalidOperationException ();
 438                 }
 439
 440                 public int GetToken (MemberInfo member, bool create_open_instance) {
 441                         return m.AddRef (member);
 442                 }
 443
 444                 public int GetToken (SignatureHelper helper) {
 445                         return m.AddRef (helper);
 446                 }
 447         }
 448 }
 449