mcs/class/corlib/System.Reflection/MonoParameterInfo.cs

   1 // System.Reflection.ParameterInfo
   2 //
   3 // Authors:
   4 //   Sean MacIsaac (macisaac@ximian.com)
   5 //   Marek Safar (marek.safar@gmail.com)
   6 //
   7 // (C) 2001 Ximian, Inc.
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 // Copyright 2013 Xamarin, Inc (http://www.xamarin.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if !FULL_AOT_RUNTIME
  32 using System.Reflection.Emit;
  33 #endif
  34 using System.Runtime.CompilerServices;
  35 using System.Runtime.InteropServices;
  36 using System.Collections.Generic;
  37 using System.Text;
  38
  39 namespace System.Reflection
  40 {
  41         [ComVisible (true)]
  42         [ComDefaultInterfaceAttribute (typeof (_ParameterInfo))]
  43         [Serializable]
  44         [ClassInterfaceAttribute (ClassInterfaceType.None)]
  45         [StructLayout (LayoutKind.Sequential)]
  46         class MonoParameterInfo : ParameterInfo {
  47
  48 #if !FULL_AOT_RUNTIME
  49                 internal MonoParameterInfo (ParameterBuilder pb, Type type, MemberInfo member, int position) {
  50                         this.ClassImpl = type;
  51                         this.MemberImpl = member;
  52                         if (pb != null) {
  53                                 this.NameImpl = pb.Name;
  54                                 this.PositionImpl = pb.Position - 1;    // ParameterInfo.Position is zero-based
  55                                 this.AttrsImpl = (ParameterAttributes) pb.Attributes;
  56                         } else {
  57                                 this.NameImpl = null;
  58                                 this.PositionImpl = position - 1;
  59                                 this.AttrsImpl = ParameterAttributes.None;
  60                         }
  61                 }
  62 #endif
  63
  64                 /*FIXME this constructor looks very broken in the position parameter*/
  65                 internal MonoParameterInfo (ParameterInfo pinfo, Type type, MemberInfo member, int position) {
  66                         this.ClassImpl = type;
  67                         this.MemberImpl = member;
  68                         if (pinfo != null) {
  69                                 this.NameImpl = pinfo.Name;
  70                                 this.PositionImpl = pinfo.Position - 1; // ParameterInfo.Position is zero-based
  71                                 this.AttrsImpl = (ParameterAttributes) pinfo.Attributes;
  72                         } else {
  73                                 this.NameImpl = null;
  74                                 this.PositionImpl = position - 1;
  75                                 this.AttrsImpl = ParameterAttributes.None;
  76                         }
  77                 }
  78
  79                 internal MonoParameterInfo (ParameterInfo pinfo, MemberInfo member) {
  80                         this.ClassImpl = pinfo.ParameterType;
  81                         this.MemberImpl = member;
  82                         this.NameImpl = pinfo.Name;
  83                         this.PositionImpl = pinfo.Position;
  84                         this.AttrsImpl = pinfo.Attributes;
  85                         this.DefaultValueImpl = pinfo.GetDefaultValueImpl ();
  86                         //this.parent = pinfo;
  87                 }
  88
  89                 /* to build a ParameterInfo for the return type of a method */
  90                 internal MonoParameterInfo (Type type, MemberInfo member, MarshalAsAttribute marshalAs) {
  91                         this.ClassImpl = type;
  92                         this.MemberImpl = member;
  93                         this.NameImpl = "";
  94                         this.PositionImpl = -1; // since parameter positions are zero-based, return type pos is -1
  95                         this.AttrsImpl = ParameterAttributes.Retval;
  96                         this.marshalAs = marshalAs;
  97                 }
  98
  99                 public override
 100                 object DefaultValue {
 101                         get {
 102                                 if (ClassImpl == typeof (Decimal)) {
 103                                         /* default values for decimals are encoded using a custom attribute */
 104                                         DecimalConstantAttribute[] attrs = (DecimalConstantAttribute[])GetCustomAttributes (typeof (DecimalConstantAttribute), false);
 105                                         if (attrs.Length > 0)
 106                                                 return attrs [0].Value;
 107                                 } else if (ClassImpl == typeof (DateTime)) {
 108                                         /* default values for DateTime are encoded using a custom attribute */
 109                                         DateTimeConstantAttribute[] attrs = (DateTimeConstantAttribute[])GetCustomAttributes (typeof (DateTimeConstantAttribute), false);
 110                                         if (attrs.Length > 0)
 111                                                 return new DateTime (attrs [0].Ticks);
 112                                 }
 113                                 return DefaultValueImpl;
 114                         }
 115                 }
 116
 117                 public override
 118                 object RawDefaultValue {
 119                         get {
 120                                 /*FIXME right now DefaultValue doesn't throw for reflection-only assemblies. Change this once the former is fixed.*/
 121                                 return DefaultValue;
 122                         }
 123                 }
 124
 125                 public
 126                 override
 127                 int MetadataToken {
 128                         get {
 129                                 if (MemberImpl is PropertyInfo) {
 130                                         PropertyInfo prop = (PropertyInfo)MemberImpl;
 131                                         MethodInfo mi = prop.GetGetMethod (true);
 132                                         if (mi == null)
 133                                                 mi = prop.GetSetMethod (true);
 134
 135                                         return mi.GetParametersInternal () [PositionImpl].MetadataToken;
 136                                 } else if (MemberImpl is MethodBase) {
 137                                         return GetMetadataToken ();
 138                                 }
 139                                 throw new ArgumentException ("Can't produce MetadataToken for member of type " + MemberImpl.GetType ());
 140                         }
 141                 }
 142
 143
 144                 public
 145                 override
 146                 object[] GetCustomAttributes (bool inherit)
 147                 {
 148                         return MonoCustomAttrs.GetCustomAttributes (this, inherit);
 149                 }
 150
 151                 public
 152                 override
 153                 object[] GetCustomAttributes (Type attributeType, bool inherit)
 154                 {
 155                         return MonoCustomAttrs.GetCustomAttributes (this, attributeType, inherit);
 156                 }
 157
 158
 159                 public
 160                 override
 161                 bool IsDefined( Type attributeType, bool inherit) {
 162                         return MonoCustomAttrs.IsDefined (this, attributeType, inherit);
 163                 }
 164
 165                 public override IList<CustomAttributeData> GetCustomAttributesData () {
 166                         return CustomAttributeData.GetCustomAttributes (this);
 167                 }
 168
 169
 170                 public
 171                 override
 172                 Type[] GetOptionalCustomModifiers () {
 173                         Type[] types = GetTypeModifiers (true);
 174                         if (types == null)
 175                                 return Type.EmptyTypes;
 176                         return types;
 177                 }
 178
 179                 public
 180                 override
 181                 Type[] GetRequiredCustomModifiers () {
 182                         Type[] types = GetTypeModifiers (false);
 183                         if (types == null)
 184                                 return Type.EmptyTypes;
 185                         return types;
 186                 }
 187
 188                 public override bool HasDefaultValue {
 189                         get {
 190                                 object defaultValue = DefaultValue;
 191                                 if (defaultValue == null)
 192                                         return true;
 193
 194                                 if (defaultValue.GetType () == typeof(DBNull) || defaultValue.GetType () == typeof(Missing))
 195                                         return false;
 196
 197                                 return true;
 198                         }
 199                 }
 200         }
 201 }