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

   1
   2 //
   3 // System.Reflection.Emit/MethodBuilder.cs
   4 //
   5 // Author:
   6 //   Paolo Molaro (lupus@ximian.com)
   7 //
   8 // (C) 2001 Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11 using System;
  12 using System.Reflection;
  13 using System.Reflection.Emit;
  14 using System.Globalization;
  15 using System.Runtime.CompilerServices;
  16 using System.Runtime.InteropServices;
  17
  18 namespace System.Reflection.Emit {
  19
  20         public sealed class MethodBuilder : MethodInfo {
  21                 private RuntimeMethodHandle mhandle;
  22                 private Type rtype;
  23                 private Type[] parameters;
  24                 private MethodAttributes attrs;
  25                 private MethodImplAttributes iattrs;
  26                 private string name;
  27                 private int table_idx;
  28                 private byte[] code;
  29                 private ILGenerator ilgen;
  30                 private TypeBuilder type;
  31                 private ParameterBuilder[] pinfo;
  32                 private CustomAttributeBuilder[] cattrs;
  33                 private MethodInfo override_method;
  34                 private string pi_dll;
  35                 private string pi_entry;
  36                 private CharSet ncharset;
  37                 private CallingConvention native_cc;
  38                 private CallingConventions call_conv;
  39                 private bool init_locals = true;
  40
  41                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes, CallingConventions callingConvention, Type returnType, Type[] parameterTypes) {
  42                         this.name = name;
  43                         this.attrs = attributes;
  44                         this.call_conv = callingConvention;
  45                         this.rtype = returnType;
  46                         // The MSDN docs does not specify this, but the MS MethodBuilder
  47                         // appends a HasThis flag if the method is not static
  48                         if ((attributes & MethodAttributes.Static) == 0)
  49                                 this.call_conv |= CallingConventions.HasThis;
  50                         if (parameterTypes != null) {
  51                                 this.parameters = new Type [parameterTypes.Length];
  52                                 System.Array.Copy (parameterTypes, this.parameters, parameterTypes.Length);
  53                         }
  54                         type = tb;
  55                         table_idx = get_next_table_index (this, 0x06, true);
  56                         //Console.WriteLine ("index for "+name+" set to "+table_idx.ToString());
  57                 }
  58
  59                 internal MethodBuilder (TypeBuilder tb, string name, MethodAttributes attributes,
  60                         CallingConventions callingConvention, Type returnType, Type[] parameterTypes,
  61                         String dllName, String entryName, CallingConvention nativeCConv, CharSet nativeCharset)
  62                         : this (tb, name, attributes, callingConvention, returnType, parameterTypes) {
  63                         pi_dll = dllName;
  64                         pi_entry = entryName;
  65                         native_cc = nativeCConv;
  66                         ncharset = nativeCharset;
  67                 }
  68
  69                 public bool InitLocals {
  70                         get {return init_locals;}
  71                         set {init_locals = value;}
  72                 }
  73
  74                 internal TypeBuilder TypeBuilder {
  75                         get {return type;}
  76                 }
  77
  78                 public override RuntimeMethodHandle MethodHandle {
  79                         get {
  80                                 throw NotSupported ();
  81                         }
  82                 }
  83
  84                 public override Type ReturnType {get {return rtype;}}
  85                 public override Type ReflectedType {get {return type;}}
  86                 public override Type DeclaringType {get {return type;}}
  87                 public override string Name {get {return name;}}
  88                 public override MethodAttributes Attributes {get {return attrs;}}
  89                 public override ICustomAttributeProvider ReturnTypeCustomAttributes {
  90                         get {return null;}
  91                 }
  92
  93                 public override CallingConventions CallingConvention {
  94                         get { return call_conv; }
  95                 }
  96
  97                 public MethodToken GetToken() {
  98                         return new MethodToken(0x06000000 | table_idx);
  99                 }
 100
 101                 public override MethodInfo GetBaseDefinition() {
 102                         return this;
 103                 }
 104                 public override MethodImplAttributes GetMethodImplementationFlags() {
 105                         return iattrs;
 106                 }
 107                 public override ParameterInfo[] GetParameters() {
 108                         if (parameters == null)
 109                                 return null;
 110
 111                         ParameterInfo[] retval = new ParameterInfo [parameters.Length];
 112                         for (int i = 0; i < parameters.Length; i++) {
 113                                 retval [i] = new ParameterInfo (pinfo == null ? null : pinfo [i + 1], parameters [i], this, i + 1);
 114                         }
 115                         return retval;
 116                 }
 117
 118                 public Module GetModule () {
 119                         return type.Module;
 120                 }
 121
 122                 public void CreateMethodBody( byte[] il, int count) {
 123                         if ((il != null) && ((count < 0) || (count > il.Length)))
 124                                 throw new ArgumentException ("Index was out of range.  Must be non-negative and less than the size of the collection.");
 125
 126                         if ((code != null) || type.is_created)
 127                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 128
 129                         if (il == null)
 130                                 code = null;
 131                         else {
 132                                 code = new byte [count];
 133                                 System.Array.Copy(il, code, count);
 134                         }
 135                 }
 136
 137                 public override Object Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) {
 138                         throw NotSupported ();
 139                 }
 140                 public override bool IsDefined (Type attribute_type, bool inherit) {
 141                         throw NotSupported ();
 142                 }
 143                 public override object[] GetCustomAttributes( bool inherit) {
 144                         throw NotSupported ();
 145                 }
 146                 public override object[] GetCustomAttributes( Type attributeType, bool inherit) {
 147                         throw NotSupported ();
 148                 }
 149                 public ILGenerator GetILGenerator () {
 150                         return GetILGenerator (64);
 151                 }
 152
 153                 public ILGenerator GetILGenerator (int size) {
 154                         if (((iattrs & MethodImplAttributes.CodeTypeMask) !=
 155                                  MethodImplAttributes.IL) ||
 156                                 ((iattrs & MethodImplAttributes.ManagedMask) !=
 157                                  MethodImplAttributes.Managed))
 158                                 throw new InvalidOperationException ("Method body should not exist.");
 159                         if (ilgen != null)
 160                                 return ilgen;
 161                         ilgen = new ILGenerator (this, size);
 162                         return ilgen;
 163                 }
 164
 165                 public ParameterBuilder DefineParameter (int position, ParameterAttributes attributes, string strParamName)
 166                 {
 167                         //
 168                         // Extension: Mono allows position == 0 for the return attribute
 169                         //
 170                         if ((position < 0) || (position > parameters.Length))
 171                                 throw new ArgumentOutOfRangeException ("position");
 172
 173                         RejectIfCreated ();
 174
 175                         ParameterBuilder pb = new ParameterBuilder (this, position, attributes, strParamName);
 176                         if (pinfo == null)
 177                                 pinfo = new ParameterBuilder [parameters.Length + 1];
 178                         pinfo [position] = pb;
 179                         return pb;
 180                 }
 181
 182                 internal void fixup () {
 183                         if (ilgen != null)
 184                                 ilgen.label_fixup ();
 185                 }
 186
 187                 public void SetCustomAttribute( CustomAttributeBuilder customBuilder) {
 188                         if (customBuilder == null)
 189                                 throw new ArgumentNullException ("customBuilder");
 190                         string attrname = customBuilder.Ctor.ReflectedType.FullName;
 191                         if (attrname == "System.Runtime.CompilerServices.MethodImplAttribute") {
 192                                 byte[] data = customBuilder.Data;
 193                                 int impla; // the (stupid) ctor takes a short or an int ...
 194                                 impla = (int)data [2];
 195                                 impla |= ((int)data [3]) << 8;
 196                                 SetImplementationFlags ((MethodImplAttributes)impla);
 197                                 return;
 198                         }
 199                         if (cattrs != null) {
 200                                 CustomAttributeBuilder[] new_array = new CustomAttributeBuilder [cattrs.Length + 1];
 201                                 cattrs.CopyTo (new_array, 0);
 202                                 new_array [cattrs.Length] = customBuilder;
 203                                 cattrs = new_array;
 204                         } else {
 205                                 cattrs = new CustomAttributeBuilder [1];
 206                                 cattrs [0] = customBuilder;
 207                         }
 208                 }
 209                 public void SetCustomAttribute( ConstructorInfo con, byte[] binaryAttribute) {
 210                         if (con == null)
 211                                 throw new ArgumentNullException ("con");
 212                         if (binaryAttribute == null)
 213                                 throw new ArgumentNullException ("binaryAttribute");
 214                         SetCustomAttribute (new CustomAttributeBuilder (con, binaryAttribute));
 215                 }
 216                 public void SetImplementationFlags( MethodImplAttributes attributes) {
 217                         RejectIfCreated ();
 218                         iattrs = attributes;
 219                 }
 220                 internal override int get_next_table_index (object obj, int table, bool inc) {
 221                     return type.get_next_table_index (obj, table, inc);
 222                 }
 223
 224                 internal void set_override (MethodInfo mdecl) {
 225                         override_method = mdecl;
 226                 }
 227
 228                 private void RejectIfCreated () {
 229                         if (type.is_created)
 230                                 throw new InvalidOperationException ("Type definition of the method is complete.");
 231                 }
 232
 233                 private Exception NotSupported () {
 234                         return new NotSupportedException ("The invoked member is not supported in a dynamic module.");
 235                 }
 236         }
 237 }
 238