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 !FULL_AOT_RUNTIME
  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         [ComVisible (true)]
  46         [StructLayout (LayoutKind.Sequential)]
  47         public sealed class DynamicMethod : MethodInfo {
  48
  49 #pragma warning disable 169, 414, 649
  50                 #region Sync with reflection.h
  51                 private RuntimeMethodHandle mhandle;
  52                 private string name;
  53                 private Type returnType;
  54                 private Type[] parameters;
  55                 private MethodAttributes attributes;
  56                 private CallingConventions callingConvention;
  57                 private Module module;
  58                 private bool skipVisibility;
  59                 private bool init_locals = true;
  60                 private ILGenerator ilgen;
  61                 private int nrefs;
  62                 private object[] refs;
  63                 private IntPtr referenced_by;
  64                 private Type owner;
  65                 #endregion
  66 #pragma warning restore 169, 414, 649
  67
  68                 private Delegate deleg;
  69                 private MonoMethod method;
  70                 private ParameterBuilder[] pinfo;
  71                 internal bool creating;
  72                 private DynamicILInfo il_info;
  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                         if (owner != null && (owner.IsArray || owner.IsInterface)) {
 117                                 throw new ArgumentException ("Owner can't be an array or an interface.");
 118                         }
 119
 120                         if (m == null)
 121                                 m = AnonHostModuleHolder.AnonHostModule;
 122
 123                         this.name = name;
 124                         this.attributes = attributes | MethodAttributes.Static;
 125                         this.callingConvention = callingConvention;
 126                         this.returnType = returnType;
 127                         this.parameters = parameterTypes;
 128                         this.owner = owner;
 129                         this.module = m;
 130                         this.skipVisibility = skipVisibility;
 131                 }
 132
 133                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 134                 private extern void create_dynamic_method (DynamicMethod m);
 135
 136                 private void CreateDynMethod () {
 137                         if (mhandle.Value == IntPtr.Zero) {
 138                                 if (ilgen == null || ilgen.ILOffset == 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                 [ComVisible (true)]
 165                 public Delegate CreateDelegate (Type delegateType)
 166                 {
 167                         if (delegateType == null)
 168                                 throw new ArgumentNullException ("delegateType");
 169                         if (deleg != null)
 170                                 return deleg;
 171
 172                         CreateDynMethod ();
 173
 174                         deleg = Delegate.CreateDelegate (delegateType, this);
 175                         return deleg;
 176                 }
 177
 178                 [ComVisible (true)]
 179                 public Delegate CreateDelegate (Type delegateType, object target)
 180                 {
 181                         if (delegateType == null)
 182                                 throw new ArgumentNullException ("delegateType");
 183
 184                         CreateDynMethod ();
 185
 186                         /* Can't cache the delegate since it is different for each target */
 187                         return Delegate.CreateDelegate (delegateType, target, this);
 188                 }
 189
 190                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string parameterName)
 191                 {
 192                         //
 193                         // Extension: Mono allows position == 0 for the return attribute
 194                         //
 195                         if ((position < 0) || (position > parameters.Length))
 196                                 throw new ArgumentOutOfRangeException ("position");
 197
 198                         RejectIfCreated ();
 199
 200                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, parameterName);
 201                         if (pinfo == null)
 202                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 203                         pinfo [position] = pb;
 204                         return pb;
 205                 }
 206
 207                 public override MethodInfo GetBaseDefinition () {
 208                         return this;
 209                 }
 210
 211                 [MonoTODO("Not implemented")]
 212                 public override object[] GetCustomAttributes (bool inherit) {
 213                         throw new NotImplementedException ();
 214                 }
 215
 216                 [MonoTODO("Not implemented")]
 217                 public override object[] GetCustomAttributes (Type attributeType,
 218                                                                                                           bool inherit) {
 219                         throw new NotImplementedException ();
 220                 }
 221
 222                 public DynamicILInfo GetDynamicILInfo () {
 223                         if (il_info == null)
 224                                 il_info = new DynamicILInfo (this);
 225                         return il_info;
 226                 }
 227
 228                 public ILGenerator GetILGenerator () {
 229                         return GetILGenerator (64);
 230                 }
 231
 232                 public ILGenerator GetILGenerator (int streamSize) {
 233                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 234                                  MethodImplAttributes.IL) ||
 235                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 236                                  MethodImplAttributes.Managed))
 237                                 throw new InvalidOperationException ("Method body should not exist.");
 238                         if (ilgen != null)
 239                                 return ilgen;
 240                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), streamSize);
 241                         return ilgen;
 242                 }
 243
 244                 public override MethodImplAttributes GetMethodImplementationFlags () {
 245                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 246                 }
 247
 248                 public override ParameterInfo[] GetParameters () {
 249                         if (parameters == null)
 250                                 return new ParameterInfo [0];
 251
 252                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 253                         for (int i = 0; i < parameters.Length; i++) {
 254                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 255                         }
 256                         return retval;
 257                 }
 258
 259                 internal override int GetParameterCount ()
 260                 {
 261                         return parameters == null ? 0 : parameters.Length;
 262                 }
 263
 264                 internal override Type GetParameterType (int pos) {
 265                         return parameters [pos];
 266                 }
 267
 268                 /*
 269                 public override object Invoke (object obj, object[] parameters) {
 270                         CreateDynMethod ();
 271                         if (method == null)
 272                                 method = new MonoMethod (mhandle);
 273                         return method.Invoke (obj, parameters);
 274                 }
 275                 */
 276
 277                 public override object Invoke (object obj, BindingFlags invokeAttr,
 278                                                                            Binder binder, object[] parameters,
 279                                                                            CultureInfo culture)
 280                 {
 281                         try {
 282                                 CreateDynMethod ();
 283                                 if (method == null)
 284                                         method = new MonoMethod (mhandle);
 285
 286                                 return method.Invoke (obj, parameters);
 287                         }
 288                         catch (MethodAccessException mae) {
 289                                 throw new TargetInvocationException ("Method cannot be invoked.", mae);
 290                         }
 291                 }
 292
 293                 [MonoTODO("Not implemented")]
 294                 public override bool IsDefined (Type attributeType, bool inherit) {
 295                         throw new NotImplementedException ();
 296                 }
 297
 298                 public override string ToString () {
 299                         string parms = String.Empty;
 300                         ParameterInfo[] p = GetParameters ();
 301                         for (int i = 0; i < p.Length; ++i) {
 302                                 if (i > 0)
 303                                         parms = parms + ", ";
 304                                 parms = parms + p [i].ParameterType.Name;
 305                         }
 306                         return ReturnType.Name+" "+Name+"("+parms+")";
 307                 }
 308
 309                 public override MethodAttributes Attributes {
 310                         get {
 311                                 return attributes;
 312                         }
 313                 }
 314
 315                 public override CallingConventions CallingConvention {
 316                         get {
 317                                 return callingConvention;
 318                         }
 319                 }
 320
 321                 public override Type DeclaringType {
 322                         get {
 323                                 return null;
 324                         }
 325                 }
 326
 327                 public bool InitLocals {
 328                         get {
 329                                 return init_locals;
 330                         }
 331                         set {
 332                                 init_locals = value;
 333                         }
 334                 }
 335
 336                 public override RuntimeMethodHandle MethodHandle {
 337                         get {
 338                                 return mhandle;
 339                         }
 340                 }
 341
 342                 public override Module Module {
 343                         get {
 344                                 return module;
 345                         }
 346                 }
 347
 348                 public override string Name {
 349                         get {
 350                                 return name;
 351                         }
 352                 }
 353
 354                 public override Type ReflectedType {
 355                         get {
 356                                 return null;
 357                         }
 358                 }
 359
 360                 [MonoTODO("Not implemented")]
 361                 public override ParameterInfo ReturnParameter {
 362                         get {
 363                                 throw new NotImplementedException ();
 364                         }
 365                 }
 366
 367                 public override Type ReturnType {
 368                         get {
 369                                 return returnType;
 370                         }
 371                 }
 372
 373                 [MonoTODO("Not implemented")]
 374                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 375                         get {
 376                                 throw new NotImplementedException ();
 377                         }
 378                 }
 379
 380 /*
 381                 public override int MetadataToken {
 382                         get {
 383                                 return 0;
 384                         }
 385                 }
 386 */
 387
 388                 private void RejectIfCreated () {
 389                         if (mhandle.Value != IntPtr.Zero)
 390                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 391                 }
 392
 393                 internal int AddRef (object reference) {
 394                         if (refs == null)
 395                                 refs = new object [4];
 396                         if (nrefs >= refs.Length - 1) {
 397                                 object [] new_refs = new object [refs.Length * 2];
 398                                 System.Array.Copy (refs, new_refs, refs.Length);
 399                                 refs = new_refs;
 400                         }
 401                         refs [nrefs] = reference;
 402                         /* Reserved by the runtime */
 403                         refs [nrefs + 1] = null;
 404                         nrefs += 2;
 405                         return nrefs - 1;
 406                 }
 407
 408                 // This class takes care of constructing the module in a thread safe manner
 409                 class AnonHostModuleHolder {
 410                         public static Module anon_host_module;
 411
 412                         static AnonHostModuleHolder () {
 413                                 AssemblyName aname = new AssemblyName ();
 414                                 aname.Name = "Anonymously Hosted DynamicMethods Assembly";
 415                                 AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly (aname, AssemblyBuilderAccess.Run);
 416
 417                                 anon_host_module = ab.GetManifestModule ();
 418                         }
 419
 420                         public static Module AnonHostModule {
 421                                 get {
 422                                         return anon_host_module;
 423                                 }
 424                         }
 425                 }
 426         }
 427
 428         internal class DynamicMethodTokenGenerator : TokenGenerator {
 429
 430                 private DynamicMethod m;
 431
 432                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 433                         this.m = m;
 434                 }
 435
 436                 public int GetToken (string str) {
 437                         return m.AddRef (str);
 438                 }
 439
 440                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 441                         throw new InvalidOperationException ();
 442                 }
 443
 444                 public int GetToken (MemberInfo member, bool create_open_instance) {
 445                         return m.AddRef (member);
 446                 }
 447
 448                 public int GetToken (SignatureHelper helper) {
 449                         return m.AddRef (helper);
 450                 }
 451         }
 452 }
 453
 454 #endif