mcs/class/corlib/System.Reflection.Emit/MethodBuilder.cs

   1 //
   2 // System.Reflection.Emit/MethodBuilder.cs
   3 //
   4 // Author:
   5 //   Paolo Molaro (lupus@ximian.com)
   6 //
   7 // (C) 2001 Ximian, Inc.  http://www.ximian.com
   8 //
   9
  10 using System;
  11 using System.Reflection;
  12 using System.Reflection.Emit;
  13 using System.Globalization;
  14 using System.Security;
  15 using System.Security.Permissions;
  16 using System.Runtime.CompilerServices;
  17 using System.Runtime.InteropServices;
  18
  19 namespace System.Reflection.Emit {
  20
  21         public sealed class MethodBuilder : MethodInfo {
  22                 private RuntimeMethodHandle mhandle;
  23                 private Type rtype;
  24                 private Type[] parameters;
  25                 private MethodAttributes attrs;
  26                 private MethodImplAttributes iattrs;
  27                 private string name;
  28                 private int table_idx;
  29                 private byte[] code;
  30                 private ILGenerator ilgen;
  31                 private TypeBuilder type;
  32                 private ParameterBuilder[] pinfo;
  33                 private CustomAttributeBuilder[] cattrs;
  34                 private MethodInfo override_method;
  35                 private string pi_dll;
  36                 private string pi_entry;
  37                 private CharSet ncharset;
  38                 private CallingConvention native_cc;
  39                 private CallingConventions call_conv;
  40                 private bool init_locals = true;
  41 #if NET_2_0 | BOOTSTRAP_NET_2_0
  42                 private GenericTypeParameterBuilder[] generic_params;
  43 #else
  44                 private Object generic_params; /* so offsets are the same */
  45 #endif
  46                 private Type[] returnModReq;
  47                 private Type[] returnModOpt;
  48                 private Type[][] paramModReq;
  49                 private Type[][] paramModOpt;
  50                 private RefEmitPermissionSet[] permissions;
  51
  52                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt) {
  53                         this.name = name;
  54                         this.attrs = attributes;
  55                         this.call_conv = callingConvention;
  56                         this.rtype = returnType;
  57                         this.returnModReq = returnModReq;
  58                         this.returnModOpt = returnModOpt;
  59                         this.paramModReq = paramModReq;
  60                         this.paramModOpt = paramModOpt;
  61                         // The MSDN docs does not specify this, but the MS MethodBuilder
  62                         // appends a HasThis flag if the method is not static
  63                         if ((attributes & MethodAttributes.Static) == 0)
  64                                 this.call_conv |= CallingConventions.HasThis;
  65                         if (parameterTypes != null) {
  66                                 this.parameters = new Type [parameterTypes.Length];
  67                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
  68                         }
  69                         type = tb;
  70                         table_idx = get_next_table_index (this, 0x06, true);
  71                         //Console.WriteLine ("index for "+name+" set to "+table_idx.ToString());
  72                 }
  73
  74                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
  75                                                                 CallingConventions callingConvention, Type returnType, Type[] returnModReq, Type[] returnModOpt, Type[] parameterTypes, Type[][] paramModReq, Type[][] paramModOpt,
  76                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
  77                         : this (tb, name, attributes, callingConvention, returnType, returnModReq, returnModOpt, parameterTypes, paramModReq, paramModOpt) {
  78                         pi_dll = dllName;
  79                         pi_entry = entryName;
  80                         native_cc = nativeCConv;
  81                         ncharset = nativeCharset;
  82                 }
  83
  84                 public bool InitLocals {
  85                         get {return init_locals;}
  86                         set {init_locals = value;}
  87                 }
  88
  89                 internal TypeBuilder TypeBuilder {
  90                         get {return type;}
  91                 }
  92
  93                 public override RuntimeMethodHandle MethodHandle {
  94                         get {
  95                                 throw NotSupported ();
  96                         }
  97                 }
  98
  99                 public override Type ReturnType {get {return rtype;}}
 100                 public override Type ReflectedType {get {return type;}}
 101                 public override Type DeclaringType {get {return type;}}
 102                 public override string Name {get {return name;}}
 103                 public override MethodAttributes Attributes {get {return attrs;}}
 104                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
 105                         get {return null;}
 106                 }
 107
 108                 public override CallingConventions CallingConvention {
 109                         get { return call_conv; }
 110                 }
 111
 112                 [MonoTODO]
 113                 public string Signature {
 114                         get {
 115                                 throw new NotImplementedException ();
 116                         }
 117                 }
 118
 119                 public MethodToken GetToken() {
 120                         return new MethodToken(0x06000000 | table_idx);
 121                 }
 122
 123                 public override MethodInfo GetBaseDefinition() {
 124                         return this;
 125                 }
 126                 public override MethodImplAttributes GetMethodImplementationFlags() {
 127                         return iattrs;
 128                 }
 129                 public override ParameterInfo[] GetParameters() {
 130                         if (parameters == null)
 131                                 return null;
 132
 133                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 134                         for (int i = 0; i < parameters.Length; i++) {
 135                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 136                         }
 137                         return retval;
 138                 }
 139
 140                 internal override int GetParameterCount ()
 141                 {
 142                         if (parameters == null)
 143                                 return 0;
 144
 145                         return parameters.Length;
 146                 }
 147
 148                 public Module GetModule () {
 149                         return type.Module;
 150                 }
 151
 152                 public void CreateMethodBody( byte[] il, int count) {
 153                         if ((il != null) && ((count < 0) || (count > il.Length)))
 154                                 throw new ArgumentException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 155
 156                         if ((code != null) || type.is_created)
 157                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 158
 159                         if (il == null)
 160                                 code = null;
 161                         else {
 162                                 code = new byte [count];
 163                                 System.Array.Copy(il, code, count);
 164                         }
 165                 }
 166
 167                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) {
 168                         throw NotSupported ();
 169                 }
 170                 public override bool IsDefined (Type attribute_type, bool inherit) {
 171                         throw NotSupported ();
 172                 }
 173                 public override object[] GetCustomAttributes( bool inherit) {
 174                         throw NotSupported ();
 175                 }
 176                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 177                         throw NotSupported ();
 178                 }
 179                 public ILGenerator GetILGenerator () {
 180                         return GetILGenerator (64);
 181                 }
 182
 183                 public ILGenerator GetILGenerator (int size) {
 184                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 185                                  MethodImplAttributes.IL) ||
 186                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 187                                  MethodImplAttributes.Managed))
 188                                 throw new InvalidOperationException ("Method body should not exist.");
 189                         if (ilgen != null)
 190                                 return ilgen;
 191                         ilgen = new ILGenerator (type.Module, ((ModuleBuilder)type.Module).GetTokenGenerator (), size);
 192                         return ilgen;
 193                 }
 194
 195                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 196                 {
 197                         //
 198                         // Extension: Mono allows position == 0 for the return attribute
 199                         //
 200                         if ((position < 0) || (position > parameters.Length))
 201                                 throw new ArgumentOutOfRangeException ("position");
 202
 203                         RejectIfCreated ();
 204
 205                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 206                         if (pinfo == null)
 207                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 208                         pinfo [position] = pb;
 209                         return pb;
 210                 }
 211
 212                 internal void fixup () {
 213                         if (ilgen != null)
 214                                 ilgen.label_fixup ();
 215                 }
 216
 217                 public void SetCustomAttribute( CustomAttributeBuilder customBuilder) {
 218                         if (customBuilder == null)
 219                                 throw new ArgumentNullException ("customBuilder");
 220                         string attrname = customBuilder.Ctor.ReflectedType.FullName;
 221                         if (attrname == "System.Runtime.CompilerServices.MethodImplAttribute") {
 222                                 byte[] data = customBuilder.Data;
 223                                 int impla; // the (stupid) ctor takes a short or an int ...
 224                                 impla = (int)data [2];
 225                                 impla |= ((int)data [3]) << 8;
 226                                 SetImplementationFlags ((MethodImplAttributes)impla);
 227                                 return;
 228                         }
 229                         if (cattrs != null) {
 230                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 231                                 cattrs.CopyTo (new_array, 0);
 232                                 new_array [cattrs.Length] = customBuilder;
 233                                 cattrs = new_array;
 234                         } else {
 235                                 cattrs = new CustomAttributeBuilder [1];
 236                                 cattrs [0] = customBuilder;
 237                         }
 238                 }
 239                 public void SetCustomAttribute( ConstructorInfo con, byte[] binaryAttribute) {
 240                         if (con == null)
 241                                 throw new ArgumentNullException ("con");
 242                         if (binaryAttribute == null)
 243                                 throw new ArgumentNullException ("binaryAttribute");
 244                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 245                 }
 246                 public void SetImplementationFlags( MethodImplAttributes attributes) {
 247                         RejectIfCreated ();
 248                         iattrs = attributes;
 249                 }
 250
 251                 public void AddDeclarativeSecurity( SecurityAction action, PermissionSet pset) {
 252                         if (pset == null)
 253                                 throw new ArgumentNullException ("pset");
 254                         if ((action == SecurityAction.RequestMinimum) ||
 255                                 (action == SecurityAction.RequestOptional) ||
 256                                 (action == SecurityAction.RequestRefuse))
 257                                 throw new ArgumentException ("Request* values are not permitted", "action");
 258
 259                         RejectIfCreated ();
 260
 261                         if (permissions != null) {
 262                                 /* Check duplicate actions */
 263                                 foreach (RefEmitPermissionSet set in permissions)
 264                                         if (set.action == action)
 265                                                 throw new InvalidOperationException ("Multiple permission sets specified with the same SecurityAction.");
 266
 267                                 RefEmitPermissionSet[] new_array = new RefEmitPermissionSet [permissions.Length + 1];
 268                                 permissions.CopyTo (new_array, 0);
 269                                 permissions = new_array;
 270                         }
 271                         else
 272                                 permissions = new RefEmitPermissionSet [1];
 273
 274                         permissions [permissions.Length - 1] = new RefEmitPermissionSet (action, pset.ToXml ().ToString ());
 275                         attrs |= MethodAttributes.HasSecurity;
 276                 }
 277
 278                 [MonoTODO]
 279                 public void SetMarshal (UnmanagedMarshal unmanagedMarshal)
 280                 {
 281                         RejectIfCreated ();
 282                         throw new NotImplementedException ();
 283                 }
 284
 285                 [MonoTODO]
 286                 public void SetSymCustomAttribute (string name, byte[] data)
 287                 {
 288                         RejectIfCreated ();
 289                         throw new NotImplementedException ();
 290                 }
 291
 292                 internal override int get_next_table_index (object obj, int table, bool inc) {
 293                     return type.get_next_table_index (obj, table, inc);
 294                 }
 295
 296                 internal void set_override (MethodInfo mdecl) {
 297                         override_method = mdecl;
 298                 }
 299
 300                 private void RejectIfCreated () {
 301                         if (type.is_created)
 302                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 303                 }
 304
 305                 private Exception NotSupported () {
 306                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 307                 }
 308
 309 #if NET_2_0 | BOOTSTRAP_NET_2_0
 310                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 311                 public override extern MethodInfo BindGenericParameters (Type [] types);
 312
 313                 public override bool Mono_IsInflatedMethod {
 314                         get {
 315                                 return false;
 316                         }
 317                 }
 318
 319                 public override bool HasGenericParameters {
 320                         get {
 321                                 return generic_params != null;
 322                         }
 323                 }
 324
 325                 public override Type[] GetGenericArguments ()
 326                 {
 327                         if (generic_params == null)
 328                                 return new Type [0];
 329
 330                         Type[] result = new Type [generic_params.Length];
 331                         for (int i = 0; i < generic_params.Length; i++)
 332                                 result [i] = generic_params [i];
 333
 334                         return result;
 335                 }
 336
 337                 public GenericTypeParameterBuilder[] DefineGenericParameters (string[] names)
 338                 {
 339                         generic_params = new GenericTypeParameterBuilder [names.Length];
 340                         for (int i = 0; i < names.Length; i++)
 341                                 generic_params [i] = new GenericTypeParameterBuilder (
 342                                         type, this, names [i], i);
 343
 344                         return generic_params;
 345                 }
 346
 347                 public void SetGenericMethodSignature (MethodAttributes attributes, CallingConventions callingConvention, Type return_type, Type[] parameter_types)
 348                 {
 349                         RejectIfCreated ();
 350
 351                         this.attrs = attributes;
 352                         this.call_conv = callingConvention;
 353                         if ((attributes & MethodAttributes.Static) == 0)
 354                                 this.call_conv |= CallingConventions.HasThis;
 355
 356                         this.rtype = return_type;
 357                         this.parameters = new Type [parameter_types.Length];
 358                         System.Array.Copy (parameter_types, this.parameters, parameter_types.Length);
 359                 }
 360 #endif
 361         }
 362 }
 363