mcs/mcs/modifiers.cs

   1 //
   2 // modifiers.cs: Modifier handling.
   3 //
   4 using System;
   5 using System.Reflection;
   6
   7 namespace Mono.CSharp {
   8         public class Modifiers {
   9
  10                 //
  11                 // The ordering of the following 4 constants
  12                 // has been carefully done.
  13                 //
  14                 public const int PROTECTED = 0x0001;
  15                 public const int PUBLIC    = 0x0002;
  16                 public const int PRIVATE   = 0x0004;
  17                 public const int INTERNAL  = 0x0008;
  18                 public const int NEW       = 0x0010;
  19                 public const int ABSTRACT  = 0x0020;
  20                 public const int SEALED    = 0x0040;
  21                 public const int STATIC    = 0x0080;
  22                 public const int READONLY  = 0x0100;
  23                 public const int VIRTUAL   = 0x0200;
  24                 public const int OVERRIDE  = 0x0400;
  25                 public const int EXTERN    = 0x0800;
  26                 public const int VOLATILE  = 0x1000;
  27                 public const int UNSAFE    = 0x2000;
  28                 private const int TOP      = 0x2000;
  29
  30                 public const int PROPERTY_CUSTOM = 0x4000; // Custom property modifier
  31
  32                 //
  33                 // We use this internally to flag that the method contains an iterator
  34                 //
  35                 public const int METHOD_YIELDS                  = 0x8000;
  36                 public const int METHOD_GENERIC                 = 0x10000;
  37                 public const int PARTIAL                                        = 0x20000;
  38                 public const int DEFAULT_ACCESS_MODIFER = 0x40000;
  39                 public const int METHOD_EXTENSION               = 0x80000;
  40                 public const int COMPILER_GENERATED             = 0x100000;
  41
  42                 public const int Accessibility =
  43                         PUBLIC | PROTECTED | INTERNAL | PRIVATE;
  44                 public const int AllowedExplicitImplFlags =
  45                         UNSAFE | EXTERN;
  46
  47                 static public string Name (int i)
  48                 {
  49                         string s = "";
  50
  51                         switch (i) {
  52                         case Modifiers.NEW:
  53                                 s = "new"; break;
  54                         case Modifiers.PUBLIC:
  55                                 s = "public"; break;
  56                         case Modifiers.PROTECTED:
  57                                 s = "protected"; break;
  58                         case Modifiers.INTERNAL:
  59                                 s = "internal"; break;
  60                         case Modifiers.PRIVATE:
  61                                 s = "private"; break;
  62                         case Modifiers.ABSTRACT:
  63                                 s = "abstract"; break;
  64                         case Modifiers.SEALED:
  65                                 s = "sealed"; break;
  66                         case Modifiers.STATIC:
  67                                 s = "static"; break;
  68                         case Modifiers.READONLY:
  69                                 s = "readonly"; break;
  70                         case Modifiers.VIRTUAL:
  71                                 s = "virtual"; break;
  72                         case Modifiers.OVERRIDE:
  73                                 s = "override"; break;
  74                         case Modifiers.EXTERN:
  75                                 s = "extern"; break;
  76                         case Modifiers.VOLATILE:
  77                                 s = "volatile"; break;
  78                         case Modifiers.UNSAFE:
  79                                 s = "unsafe"; break;
  80                         }
  81
  82                         return s;
  83                 }
  84
  85                 public static string GetDescription (MethodAttributes ma)
  86                 {
  87                         if ((ma & MethodAttributes.Assembly) != 0)
  88                                 return "internal";
  89
  90                         if ((ma & MethodAttributes.Family) != 0)
  91                                 return "protected";
  92
  93                         if ((ma & MethodAttributes.Public) != 0)
  94                                 return "public";
  95
  96                         if ((ma & MethodAttributes.FamANDAssem) != 0)
  97                                 return "protected internal";
  98
  99                         if ((ma & MethodAttributes.Private) != 0)
 100                                 return "private";
 101
 102                         throw new NotImplementedException (ma.ToString ());
 103                 }
 104
 105                 public static TypeAttributes TypeAttr (int mod_flags, bool is_toplevel)
 106                 {
 107                         TypeAttributes t = 0;
 108
 109                         if (is_toplevel){
 110                                 if ((mod_flags & PUBLIC) != 0)
 111                                         t |= TypeAttributes.Public;
 112                                 if ((mod_flags & PRIVATE) != 0)
 113                                         t |= TypeAttributes.NotPublic;
 114                         } else {
 115                                 if ((mod_flags & PUBLIC) != 0)
 116                                         t |= TypeAttributes.NestedPublic;
 117                                 if ((mod_flags & PRIVATE) != 0)
 118                                         t |= TypeAttributes.NestedPrivate;
 119                                 if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
 120                                         t |= TypeAttributes.NestedFamORAssem;
 121                                 if ((mod_flags & PROTECTED) != 0)
 122                                         t |= TypeAttributes.NestedFamily;
 123                                 if ((mod_flags & INTERNAL) != 0)
 124                                         t |= TypeAttributes.NestedAssembly;
 125                         }
 126
 127                         if ((mod_flags & SEALED) != 0)
 128                                 t |= TypeAttributes.Sealed;
 129                         if ((mod_flags & ABSTRACT) != 0)
 130                                 t |= TypeAttributes.Abstract;
 131
 132                         return t;
 133                 }
 134
 135                 public static FieldAttributes FieldAttr (int mod_flags)
 136                 {
 137                         FieldAttributes fa = 0;
 138
 139                         if ((mod_flags & PUBLIC) != 0)
 140                                 fa |= FieldAttributes.Public;
 141                         if ((mod_flags & PRIVATE) != 0)
 142                                 fa |= FieldAttributes.Private;
 143                         if ((mod_flags & PROTECTED) != 0){
 144                                 if ((mod_flags & INTERNAL) != 0)
 145                                         fa |= FieldAttributes.FamORAssem;
 146                                 else
 147                                         fa |= FieldAttributes.Family;
 148                         } else {
 149                                 if ((mod_flags & INTERNAL) != 0)
 150                                         fa |= FieldAttributes.Assembly;
 151                         }
 152
 153                         if ((mod_flags & STATIC) != 0)
 154                                 fa |= FieldAttributes.Static;
 155                         if ((mod_flags & READONLY) != 0)
 156                                 fa |= FieldAttributes.InitOnly;
 157
 158                         return fa;
 159                 }
 160
 161                 public static MethodAttributes MethodAttr (int mod_flags)
 162                 {
 163                         MethodAttributes ma = MethodAttributes.HideBySig;
 164
 165                         if ((mod_flags & PUBLIC) != 0)
 166                                 ma |= MethodAttributes.Public;
 167                         if ((mod_flags & PRIVATE) != 0)
 168                                 ma |= MethodAttributes.Private;
 169                         if ((mod_flags & PROTECTED) != 0){
 170                                 if ((mod_flags & INTERNAL) != 0)
 171                                         ma |= MethodAttributes.FamORAssem;
 172                                 else
 173                                         ma |= MethodAttributes.Family;
 174                         } else {
 175                                 if ((mod_flags & INTERNAL) != 0)
 176                                         ma |= MethodAttributes.Assembly;
 177                         }
 178
 179                         if ((mod_flags & STATIC) != 0)
 180                                 ma |= MethodAttributes.Static;
 181                         if ((mod_flags & ABSTRACT) != 0){
 182                                 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual;
 183                         }
 184                         if ((mod_flags & SEALED) != 0)
 185                                 ma |= MethodAttributes.Final;
 186
 187                         if ((mod_flags & VIRTUAL) != 0)
 188                                 ma |= MethodAttributes.Virtual;
 189
 190                         if ((mod_flags & OVERRIDE) != 0)
 191                                 ma |= MethodAttributes.Virtual;
 192                         else {
 193                                 if ((ma & MethodAttributes.Virtual) != 0)
 194                                         ma |= MethodAttributes.NewSlot;
 195                         }
 196
 197                         return ma;
 198                 }
 199
 200                 // <summary>
 201                 //   Checks the object @mod modifiers to be in @allowed.
 202                 //   Returns the new mask.  Side effect: reports any
 203                 //   incorrect attributes.
 204                 // </summary>
 205                 public static int Check (int allowed, int mod, int def_access, Location l)
 206                 {
 207                         int invalid_flags  = (~allowed) & (mod & (Modifiers.TOP - 1));
 208                         int i;
 209
 210                         if (invalid_flags == 0){
 211                                 int a = mod;
 212
 213                                 if ((mod & Modifiers.UNSAFE) != 0){
 214                                         RootContext.CheckUnsafeOption (l);
 215                                 }
 216
 217                                 //
 218                                 // If no accessibility bits provided
 219                                 // then provide the defaults.
 220                                 //
 221                                 if ((mod & Accessibility) == 0){
 222                                         mod |= def_access;
 223                                         if (def_access != 0)
 224                                                 mod |= DEFAULT_ACCESS_MODIFER;
 225                                         return mod;
 226                                 }
 227
 228                                 //
 229                                 // Make sure that no conflicting accessibility
 230                                 // bits have been set.  Protected+Internal is
 231                                 // allowed, that is why they are placed on bits
 232                                 // 1 and 4 (so the shift 3 basically merges them)
 233                                 //
 234                                 a &= 15;
 235                                 a |= (a >> 3);
 236                                 a = ((a & 2) >> 1) + (a & 5);
 237                                 a = ((a & 4) >> 2) + (a & 3);
 238                                 if (a > 1)
 239                                         Report.Error (107, l, "More than one protection modifier specified");
 240
 241                                 return mod;
 242                         }
 243
 244                         for (i = 1; i <= TOP; i <<= 1){
 245                                 if ((i & invalid_flags) == 0)
 246                                         continue;
 247
 248                                 Error_InvalidModifier (l, Name (i));
 249                         }
 250
 251                         return allowed & mod;
 252                 }
 253
 254                 public static void Error_InvalidModifier (Location l, string name)
 255                 {
 256                         Report.Error (106, l, "The modifier `" + name + "' is not valid for this item");
 257                 }
 258         }
 259 }