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 #if NET_1_2
  12
  13 using System;
  14 using System.Reflection;
  15 using System.Reflection.Emit;
  16 using System.Globalization;
  17 using System.Runtime.CompilerServices;
  18 using System.Runtime.InteropServices;
  19
  20 namespace System.Reflection.Emit {
  21
  22         public sealed class DynamicMethod : MethodInfo {
  23                 #region Sync with reflection.h
  24                 private RuntimeMethodHandle mhandle;
  25                 private string name;
  26                 private Type returnType;
  27                 private Type[] parameters;
  28                 private MethodAttributes attributes;
  29                 private CallingConventions callingConvention;
  30                 private Module module;
  31                 private bool skipVisibility;
  32                 private bool init_locals = true;
  33                 private ILGenerator ilgen;
  34                 private int nrefs;
  35                 private object[] refs;
  36                 #endregion
  37                 private Delegate deleg;
  38                 private MonoMethod method;
  39                 private ParameterBuilder[] pinfo;
  40
  41                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m) : this (name, returnType, parameterTypes, m, false) {
  42                 }
  43
  44                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner) : this (name, returnType, parameterTypes, owner, false) {
  45                 }
  46
  47                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, m, skipVisibility) {
  48                 }
  49
  50                 public DynamicMethod (string name, Type returnType, Type[] parameterTypes, Type owner, bool skipVisibility) : this (name, MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, returnType, parameterTypes, owner, skipVisibility) {
  51                 }
  52
  53                 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) {
  54                 }
  55
  56                 public DynamicMethod (string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes, Module m, bool skipVisibility) {
  57                         if (name == null)
  58                                 throw new ArgumentNullException ("name");
  59                         if (name == String.Empty)
  60                                 throw new ArgumentException ("Name can't be empty", "name");
  61                         if (returnType == null)
  62                                 throw new ArgumentNullException ("returnType");
  63                         if (m == null)
  64                                 throw new ArgumentNullException ("m");
  65                         if (returnType.IsByRef)
  66                                 throw new ArgumentException ("Return type can't be a byref type", "returnType");
  67                         if (parameterTypes != null) {
  68                                 for (int i = 0; i < parameterTypes.Length; ++i)
  69                                         if (parameterTypes [i] == null)
  70                                                 throw new ArgumentException ("Parameter " + i + " is null", "parameterTypes");
  71                         }
  72
  73                         this.name = name;
  74                         this.attributes = attributes | MethodAttributes.Static;
  75                         this.callingConvention = callingConvention;
  76                         this.returnType = returnType;
  77                         this.parameters = parameterTypes;
  78                         this.module = m;
  79                         this.skipVisibility = skipVisibility;
  80                 }
  81
  82                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  83                 private extern void create_dynamic_method (DynamicMethod m);
  84
  85                 private void CreateDynMethod () {
  86                         if (mhandle.Value == IntPtr.Zero)
  87                                 create_dynamic_method (this);
  88                 }
  89
  90                 public Delegate CreateDelegate (Type delegateType) {
  91                         if (delegateType == null)
  92                                 throw new ArgumentNullException ("delegateType");
  93                         if (deleg != null)
  94                                 return deleg;
  95
  96                         CreateDynMethod ();
  97
  98                         deleg = Delegate.CreateDelegate (delegateType, this);
  99                         return deleg;
 100                 }
 101
 102                 [MonoTODO]
 103                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 104                 {
 105                         //
 106                         // Extension: Mono allows position == 0 for the return attribute
 107                         //
 108                         if ((position < 0) || (position > parameters.Length))
 109                                 throw new ArgumentOutOfRangeException ("position");
 110
 111                         RejectIfCreated ();
 112
 113                         throw new NotImplementedException ();
 114                 }
 115
 116                 public override MethodInfo GetBaseDefinition () {
 117                         return this;
 118                 }
 119
 120                 [MonoTODO]
 121                 public override object[] GetCustomAttributes (bool inherit) {
 122                         throw new NotImplementedException ();
 123                 }
 124
 125                 [MonoTODO]
 126                 public override object[] GetCustomAttributes (Type attributeType,
 127                                                                                                           bool inherit) {
 128                         throw new NotImplementedException ();
 129                 }
 130
 131                 public ILGenerator GetILGenerator () {
 132                         return GetILGenerator (64);
 133                 }
 134
 135                 public ILGenerator GetILGenerator (int size) {
 136                         if (((GetMethodImplementationFlags () & MethodImplAttributes.CodeTypeMask) !=
 137                                  MethodImplAttributes.IL) ||
 138                                 ((GetMethodImplementationFlags () & MethodImplAttributes.ManagedMask) !=
 139                                  MethodImplAttributes.Managed))
 140                                 throw new InvalidOperationException ("Method body should not exist.");
 141                         if (ilgen != null)
 142                                 return ilgen;
 143                         ilgen = new ILGenerator (Module, new DynamicMethodTokenGenerator (this), size);
 144                         return ilgen;
 145                 }
 146
 147                 public override MethodImplAttributes GetMethodImplementationFlags () {
 148                         return MethodImplAttributes.IL | MethodImplAttributes.Managed;
 149                 }
 150
 151                 public override ParameterInfo[] GetParameters () {
 152                         if (parameters == null)
 153                                 return new ParameterInfo [0];
 154
 155                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 156                         for (int i = 0; i < parameters.Length; i++) {
 157                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 158                         }
 159                         return retval;
 160                 }
 161
 162                 public override object Invoke (object obj, object[] parameters) {
 163                         CreateDynMethod ();
 164                         if (method == null)
 165                                 method = new MonoMethod (mhandle);
 166                         return method.Invoke (obj, parameters);
 167                 }
 168
 169                 public override object Invoke (object obj, BindingFlags invokeAttr,
 170                                                                            Binder binder, object[] parameters,
 171                                                                            CultureInfo culture) {
 172                         CreateDynMethod ();
 173                         if (method == null)
 174                                 method = new MonoMethod (mhandle);
 175                         return method.Invoke (obj, parameters);
 176                 }
 177
 178                 [MonoTODO]
 179                 public override bool IsDefined (Type attributeType, bool inherit) {
 180                         throw new NotImplementedException ();
 181                 }
 182
 183                 public override string ToString () {
 184                         string parms = "";
 185                         ParameterInfo[] p = GetParameters ();
 186                         for (int i = 0; i < p.Length; ++i) {
 187                                 if (i > 0)
 188                                         parms = parms + ", ";
 189                                 parms = parms + p [i].ParameterType.Name;
 190                         }
 191                         return ReturnType.Name+" "+Name+"("+parms+")";
 192                 }
 193
 194                 public override MethodAttributes Attributes {
 195                         get {
 196                                 return attributes;
 197                         }
 198                 }
 199
 200                 public override CallingConventions CallingConvention {
 201                         get {
 202                                 return callingConvention;
 203                         }
 204                 }
 205
 206                 public override Type DeclaringType {
 207                         get {
 208                                 return null;
 209                         }
 210                 }
 211
 212                 public bool InitLocals {
 213                         get {
 214                                 return init_locals;
 215                         }
 216                         set {
 217                                 init_locals = value;
 218                         }
 219                 }
 220
 221                 public override RuntimeMethodHandle MethodHandle {
 222                         get {
 223                                 return mhandle;
 224                         }
 225                 }
 226
 227                 public Module Module {
 228                         get {
 229                                 return module;
 230                         }
 231                 }
 232
 233                 public override string Name {
 234                         get {
 235                                 return name;
 236                         }
 237                 }
 238
 239                 public override Type ReflectedType {
 240                         get {
 241                                 return null;
 242                         }
 243                 }
 244
 245                 [MonoTODO]
 246                 public ParameterInfo ReturnParameter {
 247                         get {
 248                                 throw new NotImplementedException ();
 249                         }
 250                 }
 251
 252                 public override Type ReturnType {
 253                         get {
 254                                 return returnType;
 255                         }
 256                 }
 257
 258                 [MonoTODO]
 259                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 260                         get {
 261                                 throw new NotImplementedException ();
 262                         }
 263                 }
 264
 265                 private void RejectIfCreated () {
 266                         if (mhandle.Value != IntPtr.Zero)
 267                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 268                 }
 269
 270                 private Exception NotSupported () {
 271                         return new NotSupportedException ("The invoked member is not supported on a dynamic method.");
 272                 }
 273
 274                 internal int AddRef (object reference) {
 275                         if (refs == null)
 276                                 refs = new object [4];
 277                         if (nrefs >= refs.Length) {
 278                                 object [] new_refs = new object [refs.Length * 2];
 279                                 System.Array.Copy (refs, new_refs, refs.Length);
 280                                 refs = new_refs;
 281                         }
 282                         refs [nrefs] = reference;
 283                         nrefs ++;
 284                         return nrefs;
 285                 }
 286         }
 287
 288         internal class DynamicMethodTokenGenerator : TokenGenerator {
 289
 290                 private DynamicMethod m;
 291
 292                 public DynamicMethodTokenGenerator (DynamicMethod m) {
 293                         this.m = m;
 294                 }
 295
 296                 public int GetToken (string str) {
 297                         return m.AddRef (str);
 298                 }
 299
 300                 public int GetToken (MemberInfo member) {
 301                         return m.AddRef (member);
 302                 }
 303
 304                 public int GetToken (SignatureHelper helper) {
 305                         return m.AddRef (helper);
 306                 }
 307         }
 308 }
 309
 310 #endif