mcs/mcs/modifiers.cs

   1 //
   2 // modifiers.cs: Modifier handling.
   3 //
   4 using System;
   5 using System.Reflection;
   6
   7 namespace CIR {
   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 TOP       = 0x0800;
  27
  28                 public const int Accessibility =
  29                         PUBLIC | PROTECTED | INTERNAL | PRIVATE;
  30
  31                 static public string Name (int i)
  32                 {
  33                         string s = "";
  34
  35                         switch (i) {
  36                         case Modifiers.NEW:
  37                                 s = "new"; break;
  38                         case Modifiers.PUBLIC:
  39                                 s = "public"; break;
  40                         case Modifiers.PROTECTED:
  41                                 s = "protected"; break;
  42                         case Modifiers.INTERNAL:
  43                                 s = "internal"; break;
  44                         case Modifiers.PRIVATE:
  45                                 s = "private"; break;
  46                         case Modifiers.ABSTRACT:
  47                                 s = "abstract"; break;
  48                         case Modifiers.SEALED:
  49                                 s = "sealed"; break;
  50                         case Modifiers.STATIC:
  51                                 s = "static"; break;
  52                         case Modifiers.READONLY:
  53                                 s = "readonly"; break;
  54                         case Modifiers.VIRTUAL:
  55                                 s = "virtual"; break;
  56                         case Modifiers.OVERRIDE:
  57                                 s = "override"; break;
  58                         case Modifiers.EXTERN:
  59                                 s = "extern"; break;
  60                         }
  61
  62                         return s;
  63                 }
  64
  65                 public static TypeAttributes TypeAttr (int mod_flags, TypeContainer caller)
  66                 {
  67                         TypeAttributes t = 0;
  68                         bool top_level = caller.IsTopLevel;
  69
  70                         if (top_level){
  71                                 if ((mod_flags & PUBLIC) != 0)
  72                                         t |= TypeAttributes.Public;
  73                                 if ((mod_flags & PRIVATE) != 0)
  74                                         t |= TypeAttributes.NotPublic;
  75                         } else {
  76                                 if ((mod_flags & PUBLIC) != 0)
  77                                         t |= TypeAttributes.NestedPublic;
  78                                 if ((mod_flags & PRIVATE) != 0)
  79                                         t |= TypeAttributes.NestedPrivate;
  80                                 if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
  81                                         t |= TypeAttributes.NestedFamORAssem;
  82                                 if ((mod_flags & PROTECTED) != 0)
  83                                         t |= TypeAttributes.NestedFamily;
  84                                 if ((mod_flags & INTERNAL) != 0)
  85                                         t |= TypeAttributes.NestedAssembly;
  86                         }
  87
  88                         if ((mod_flags & SEALED) != 0)
  89                                 t |= TypeAttributes.Sealed;
  90                         if ((mod_flags & ABSTRACT) != 0)
  91                                 t |= TypeAttributes.Abstract;
  92
  93                         // If we have static constructors, the runtime needs to
  94                         // initialize the class, otherwise we can optimize
  95                         // the case.
  96                         if (caller.HaveStaticConstructor)
  97                                 t |= TypeAttributes.BeforeFieldInit;
  98
  99                         return t;
 100                 }
 101
 102                 public static FieldAttributes FieldAttr (int mod_flags)
 103                 {
 104                         FieldAttributes fa = 0;
 105
 106                         if ((mod_flags & PUBLIC) != 0)
 107                                 fa |= FieldAttributes.Public;
 108                         if ((mod_flags & PRIVATE) != 0)
 109                                 fa |= FieldAttributes.Private;
 110                         if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
 111                                 fa |= FieldAttributes.FamORAssem;
 112                         if ((mod_flags & PROTECTED) != 0)
 113                                 fa |= FieldAttributes.Family;
 114                         if ((mod_flags & INTERNAL) != 0)
 115                                 fa |= FieldAttributes.Assembly;
 116
 117                         if ((mod_flags & STATIC) != 0)
 118                                 fa |= FieldAttributes.Static;
 119                         if ((mod_flags & READONLY) != 0)
 120                                 fa |= FieldAttributes.InitOnly;
 121
 122                         return fa;
 123                 }
 124
 125                 public static MethodAttributes MethodAttr (int mod_flags)
 126                 {
 127                         MethodAttributes ma = 0;
 128
 129                         if ((mod_flags & PUBLIC) != 0)
 130                                 ma |= MethodAttributes.Public;
 131                         if ((mod_flags & PRIVATE) != 0)
 132                                 ma |= MethodAttributes.Private;
 133                         if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
 134                                 ma |= MethodAttributes.FamORAssem;
 135                         if ((mod_flags & PROTECTED) != 0)
 136                                 ma |= MethodAttributes.Family;
 137                         if ((mod_flags & INTERNAL) != 0)
 138                                 ma |= MethodAttributes.Assembly;
 139
 140
 141                         if ((mod_flags & STATIC) != 0)
 142                                 ma |= MethodAttributes.Static;
 143                         if ((mod_flags & ABSTRACT) != 0)
 144                                 ma |= MethodAttributes.Abstract;
 145                         if ((mod_flags & SEALED) != 0)
 146                                 ma |= MethodAttributes.Final;
 147                         if ((mod_flags & VIRTUAL) != 0)
 148                                 ma |= MethodAttributes.Virtual;
 149
 150                         return ma;
 151                 }
 152
 153                 // <summary>
 154                 //   Checks the object @mod modifiers to be in @allowed.
 155                 //   Returns the new mask.  Side effect: reports any
 156                 //   incorrect attributes.
 157                 // </summary>
 158                 public static int Check (int allowed, int mod, int def_access)
 159                 {
 160                         int invalid_flags  = (~allowed) & mod;
 161                         int i;
 162
 163                         if (invalid_flags == 0){
 164                                 int a = mod;
 165
 166                                 //
 167                                 // If no accessibility bits provided
 168                                 // then provide the defaults.
 169                                 //
 170                                 if ((mod & Accessibility) == 0){
 171                                         mod |= def_access;
 172                                         return mod;
 173                                 }
 174
 175                                 //
 176                                 // Make sure that no conflicting accessibility
 177                                 // bits have been set.  Protected+Internal is
 178                                 // allowed, that is why they are placed on bits
 179                                 // 1 and 4 (so the shift 3 basically merges them)
 180                                 //
 181                                 a &= 15;
 182                                 a |= (a >> 3);
 183                                 a = ((a & 2) >> 1) + (a & 5);
 184                                 a = ((a & 4) >> 2) + (a & 3);
 185                                 if (a > 1)
 186                                         CSharpParser.error (107, "More than one protection modifier specified");
 187
 188                                 return mod;
 189                         }
 190
 191                         for (i = 1; i < TOP; i <<= 1){
 192                                 if ((i & invalid_flags) == 0)
 193                                         continue;
 194
 195                                 CSharpParser.error (106, "the modifier `" + Name (i) + "' is not valid for this item");
 196                         }
 197
 198                         return allowed & mod;
 199                 }
 200         }
 201 }