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 do not have static constructors, static methods
  94                         // can be invoked without initializing the type.
  95                         if (!caller.HaveStaticConstructor)
  96                                 t |= TypeAttributes.BeforeFieldInit;
  97
  98                         return t;
  99                 }
 100
 101                 public static FieldAttributes FieldAttr (int mod_flags)
 102                 {
 103                         FieldAttributes fa = 0;
 104
 105                         if ((mod_flags & PUBLIC) != 0)
 106                                 fa |= FieldAttributes.Public;
 107                         if ((mod_flags & PRIVATE) != 0)
 108                                 fa |= FieldAttributes.Private;
 109                         if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
 110                                 fa |= FieldAttributes.FamORAssem;
 111                         if ((mod_flags & PROTECTED) != 0)
 112                                 fa |= FieldAttributes.Family;
 113                         if ((mod_flags & INTERNAL) != 0)
 114                                 fa |= FieldAttributes.Assembly;
 115
 116                         if ((mod_flags & STATIC) != 0)
 117                                 fa |= FieldAttributes.Static;
 118                         if ((mod_flags & READONLY) != 0)
 119                                 fa |= FieldAttributes.InitOnly;
 120
 121                         return fa;
 122                 }
 123
 124                 public static MethodAttributes MethodAttr (int mod_flags)
 125                 {
 126                         MethodAttributes ma = 0;
 127
 128                         if ((mod_flags & PUBLIC) != 0)
 129                                 ma |= MethodAttributes.Public;
 130                         if ((mod_flags & PRIVATE) != 0)
 131                                 ma |= MethodAttributes.Private;
 132                         if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
 133                                 ma |= MethodAttributes.FamORAssem;
 134                         if ((mod_flags & PROTECTED) != 0)
 135                                 ma |= MethodAttributes.Family;
 136                         if ((mod_flags & INTERNAL) != 0)
 137                                 ma |= MethodAttributes.Assembly;
 138
 139
 140                         if ((mod_flags & STATIC) != 0)
 141                                 ma |= MethodAttributes.Static;
 142                         if ((mod_flags & ABSTRACT) != 0){
 143                                 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual |
 144                                         MethodAttributes.NewSlot;
 145                         }
 146                         if ((mod_flags & SEALED) != 0)
 147                                 ma |= MethodAttributes.Final;
 148                         if ((mod_flags & VIRTUAL) != 0)
 149                                 ma |= MethodAttributes.Virtual;
 150
 151                         if ((mod_flags & OVERRIDE) != 0)
 152                                 ma |= MethodAttributes.Virtual;
 153
 154                         if ((mod_flags & NEW) != 0)
 155                                 ma |= MethodAttributes.NewSlot;
 156
 157                         return ma;
 158                 }
 159
 160                 // <summary>
 161                 //   Checks the object @mod modifiers to be in @allowed.
 162                 //   Returns the new mask.  Side effect: reports any
 163                 //   incorrect attributes.
 164                 // </summary>
 165                 public static int Check (int allowed, int mod, int def_access)
 166                 {
 167                         int invalid_flags  = (~allowed) & mod;
 168                         int i;
 169
 170                         if (invalid_flags == 0){
 171                                 int a = mod;
 172
 173                                 //
 174                                 // If no accessibility bits provided
 175                                 // then provide the defaults.
 176                                 //
 177                                 if ((mod & Accessibility) == 0){
 178                                         mod |= def_access;
 179                                         return mod;
 180                                 }
 181
 182                                 //
 183                                 // Make sure that no conflicting accessibility
 184                                 // bits have been set.  Protected+Internal is
 185                                 // allowed, that is why they are placed on bits
 186                                 // 1 and 4 (so the shift 3 basically merges them)
 187                                 //
 188                                 a &= 15;
 189                                 a |= (a >> 3);
 190                                 a = ((a & 2) >> 1) + (a & 5);
 191                                 a = ((a & 4) >> 2) + (a & 3);
 192                                 if (a > 1)
 193                                         CSharpParser.error (107, "More than one protection modifier specified");
 194
 195                                 return mod;
 196                         }
 197
 198                         for (i = 1; i < TOP; i <<= 1){
 199                                 if ((i & invalid_flags) == 0)
 200                                         continue;
 201
 202                                 CSharpParser.error (106, "the modifier `" + Name (i) + "' is not valid for this item");
 203                         }
 204
 205                         return allowed & mod;
 206                 }
 207         }
 208 }