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