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                 #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                 #endregion
  63                 private Delegate deleg;
  64                 private MonoMethod method;
  65                 private ParameterBuilder[] pinfo;
  66                 internal bool creating;
  67
  68                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  69                 }
  70
  71                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  72                 }
  73
  74                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  75                 }
  76
  77                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  78                 }
  79
  80                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, attributes, callingConvention, returnType, parameterTypes, owner.Module, skipVisibility) {
  81                 }
  82
  83                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) {
  84                         if (name == null)
  85                                 throw new ArgumentNullException ("name");
  86                         if (returnType == null)
  87                                 returnType = typeof (void);
  88                         if (m == null)
  89                                 throw new ArgumentNullException ("m");
  90                         if (returnType.IsByRef)
  91                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
  92                         if (parameterTypes != null) {
  93                                 for (int i = 0; i < parameterTypes.Length; ++i)
  94                                         if (parameterTypes [i] == null)
  95                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
  96                         }
  97
  98                         this.name = name;
  99                         this.attributes = attributes | MethodAttributes.Static;
 100                         this.callingConvention = callingConvention;
 101                         this.returnType = returnType;
 102                         this.parameters = parameterTypes;
 103                         this.module = m;
 104                         this.skipVisibility = skipVisibility;
 105                 }
 106
 107                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 108                 private extern void create_dynamic_method (DynamicMethod m);
 109
 110                 private void CreateDynMethod () {
 111                         if (mhandle.Value == IntPtr.Zero) {
 112                                 if (ilgen == null || (ILGenerator.Mono_GetCurrentOffset (ilgen) == 0))
 113                                         throw new InvalidOperationException ("Method '" + name + "' does not have a method body.");
 114
 115                                 ilgen.label_fixup ();
 116
 117                                 // Have to create all DynamicMethods referenced by this one
 118                                 try {
 119                                         // Used to avoid cycles
 120                                         creating = true;
 121                                         if (refs != null) {
 122                                                 for (int i = 0; i < refs.Length; ++i) {
 123                                                         if (refs [i] is DynamicMethod) {
 124                                                                 DynamicMethod m = (DynamicMethod)refs [i];
 125                                                                 if (!m.creating)
 126                                                                         m.CreateDynMethod ();
 127                                                         }
 128                                                 }
 129                                         }
 130                                 } finally {
 131                                         creating = false;
 132                                 }
 133
 134                                 create_dynamic_method (this);
 135                         }
 136                 }
 137
 138                 [ComVisible (true)]
 139                 public Delegate CreateDelegate (Type delegateType)
 140                 {
 141                         if (delegateType == null)
 142                                 throw new ArgumentNullException ("delegateType");
 143                         if (deleg != null)
 144                                 return deleg;
 145
 146                         CreateDynMethod ();
 147
 148                         deleg = Delegate.CreateDelegate (delegateType, this);
 149                         return deleg;
 150                 }
 151
 152                 [ComVisible (true)]
 153                 public Delegate CreateDelegate (Type delegateType, object target)
 154                 {
 155                         if (delegateType == null)
 156                                 throw new ArgumentNullException ("delegateType");
 157
 158                         CreateDynMethod ();
 159
 160                         /* Can't cache the delegate since it is different for each target */
 161                         return Delegate.CreateDelegate (delegateType, target, this);
 162                 }
 163
 164                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 165                 {
 166                         //
 167                         // Extension: Mono allows position == 0 for the return attribute
 168                         //
 169                         if ((position < 0) || (position > parameters.Length))
 170                                 throw new ArgumentOutOfRangeException ("position");
 171
 172                         RejectIfCreated ();
 173
 174                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 175                         if (pinfo == null)
 176                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 177                         pinfo [position] = pb;
 178                         return pb;
 179                 }
 180
 181                 public override MethodInfo GetBaseDefinition () {
 182                         return this;
 183                 }
 184
 185                 [MonoTODO]
 186                 public override object[] GetCustomAttributes (bool inherit) {
 187                         throw new NotImplementedException ();
 188                 }
 189
 190                 [MonoTODO]
 191                 public override object[] GetCustomAttributes (Type attributeType,
 192                                                                                                           bool inherit) {
 193                         throw new NotImplementedException ();
 194                 }
 195
 196                 public ILGenerator GetILGenerator () {
 197                         return GetILGenerator (64);
 198                 }
 199
 200                 public ILGenerator GetILGenerator (int size) {
 201                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 202                                  MethodImplAttributes.IL) ||
 203                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 204                                  MethodImplAttributes.Managed))
 205                                 throw new InvalidOperationException ("Method body should not exist.");
 206                         if (ilgen != null)
 207                                 return ilgen;
 208                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), size);
 209                         return ilgen;
 210                 }
 211
 212                 public override MethodImplAttributes GetMethodImplementationFlags () {
 213                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 214                 }
 215
 216                 public override ParameterInfo[] GetParameters () {
 217                         if (parameters == null)
 218                                 return new ParameterInfo [0];
 219
 220                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 221                         for (int i = 0; i < parameters.Length; i++) {
 222                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 223                         }
 224                         return retval;
 225                 }
 226
 227                 public override object Invoke (object obj, object[] parameters) {
 228                         CreateDynMethod ();
 229                         if (method == null)
 230                                 method = new MonoMethod (mhandle);
 231                         return method.Invoke (obj, parameters);
 232                 }
 233
 234                 public override object Invoke (object obj, BindingFlags invokeAttr,
 235                                                                            Binder binder, object[] parameters,
 236                                                                            CultureInfo culture) {
 237                         CreateDynMethod ();
 238                         if (method == null)
 239                                 method = new MonoMethod (mhandle);
 240                         return method.Invoke (obj, parameters);
 241                 }
 242
 243                 [MonoTODO]
 244                 public override bool IsDefined (Type attributeType, bool inherit) {
 245                         throw new NotImplementedException ();
 246                 }
 247
 248                 public override string ToString () {
 249                         string parms = String.Empty;
 250                         ParameterInfo[] p = GetParameters ();
 251                         for (int i = 0; i < p.Length; ++i) {
 252                                 if (i > 0)
 253                                         parms = parms + ", ";
 254                                 parms = parms + p [i].ParameterType.Name;
 255                         }
 256                         return ReturnType.Name+" "+Name+"("+parms+")";
 257                 }
 258
 259                 public override MethodAttributes Attributes {
 260                         get {
 261                                 return attributes;
 262                         }
 263                 }
 264
 265                 public override CallingConventions CallingConvention {
 266                         get {
 267                                 return callingConvention;
 268                         }
 269                 }
 270
 271                 public override Type DeclaringType {
 272                         get {
 273                                 return null;
 274                         }
 275                 }
 276
 277                 public bool InitLocals {
 278                         get {
 279                                 return init_locals;
 280                         }
 281                         set {
 282                                 init_locals = value;
 283                         }
 284                 }
 285
 286                 public override RuntimeMethodHandle MethodHandle {
 287                         get {
 288                                 return mhandle;
 289                         }
 290                 }
 291
 292                 public override Module Module {
 293                         get {
 294                                 return module;
 295                         }
 296                 }
 297
 298                 public override string Name {
 299                         get {
 300                                 return name;
 301                         }
 302                 }
 303
 304                 public override Type ReflectedType {
 305                         get {
 306                                 return null;
 307                         }
 308                 }
 309
 310                 [MonoTODO]
 311                 public override ParameterInfo ReturnParameter {
 312                         get {
 313                                 throw new NotImplementedException ();
 314                         }
 315                 }
 316
 317                 public override Type ReturnType {
 318                         get {
 319                                 return returnType;
 320                         }
 321                 }
 322
 323                 [MonoTODO]
 324                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 325                         get {
 326                                 throw new NotImplementedException ();
 327                         }
 328                 }
 329
 330                 public override int MetadataToken {
 331                         get {
 332                                 return 0;
 333                         }
 334                 }
 335
 336                 private void RejectIfCreated () {
 337                         if (mhandle.Value != IntPtr.Zero)
 338                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 339                 }
 340
 341                 private Exception NotSupported () {
 342                         return new NotSupportedException ("The invoked member is not supported on a dynamic method.");
 343                 }
 344
 345                 internal int AddRef (object reference) {
 346                         if (refs == null)
 347                                 refs = new object [4];
 348                         if (nrefs >= refs.Length - 1) {
 349                                 object [] new_refs = new object [refs.Length * 2];
 350                                 System.Array.Copy (refs, new_refs, refs.Length);
 351                                 refs = new_refs;
 352                         }
 353                         refs [nrefs] = reference;
 354                         /* Reserved by the runtime */
 355                         refs [nrefs + 1] = null;
 356                         nrefs += 2;
 357                         return nrefs - 1;
 358                 }
 359         }
 360
 361         internal class DynamicMethodTokenGenerator : TokenGenerator {
 362
 363                 private DynamicMethod m;
 364
 365                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 366                         this.m = m;
 367                 }
 368
 369                 public int GetToken (string str) {
 370                         return m.AddRef (str);
 371                 }
 372
 373                 public int GetToken (MethodInfo method, Type[] opt_param_types) {
 374                         throw new InvalidOperationException ();
 375                 }
 376
 377                 public int GetToken (MemberInfo member) {
 378                         return m.AddRef (member);
 379                 }
 380
 381                 public int GetToken (SignatureHelper helper) {
 382                         return m.AddRef (helper);
 383                 }
 384         }
 385 }
 386
 387 #endif