2 // modifiers.cs: Modifier handling.
5 using System.Reflection;
8 public class Modifiers {
11 // The ordering of the following 4 constants
12 // has been carefully done.
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;
28 public const int Accessibility =
29 PUBLIC | PROTECTED | INTERNAL | PRIVATE;
31 static public string Name (int i)
38 case Modifiers.PUBLIC:
40 case Modifiers.PROTECTED:
41 s = "protected"; break;
42 case Modifiers.INTERNAL:
43 s = "internal"; break;
44 case Modifiers.PRIVATE:
46 case Modifiers.ABSTRACT:
47 s = "abstract"; break;
48 case Modifiers.SEALED:
50 case Modifiers.STATIC:
52 case Modifiers.READONLY:
53 s = "readonly"; break;
54 case Modifiers.VIRTUAL:
56 case Modifiers.OVERRIDE:
57 s = "override"; break;
58 case Modifiers.EXTERN:
65 public static TypeAttributes TypeAttr (int mod_flags, TypeContainer caller)
68 bool top_level = caller.IsTopLevel;
71 if ((mod_flags & PUBLIC) != 0)
72 t |= TypeAttributes.Public;
73 if ((mod_flags & PRIVATE) != 0)
74 t |= TypeAttributes.NotPublic;
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;
88 if ((mod_flags & SEALED) != 0)
89 t |= TypeAttributes.Sealed;
90 if ((mod_flags & ABSTRACT) != 0)
91 t |= TypeAttributes.Abstract;
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;
101 public static FieldAttributes FieldAttr (int mod_flags)
103 FieldAttributes fa = 0;
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;
116 if ((mod_flags & STATIC) != 0)
117 fa |= FieldAttributes.Static;
118 if ((mod_flags & READONLY) != 0)
119 fa |= FieldAttributes.InitOnly;
124 public static MethodAttributes MethodAttr (int mod_flags)
126 MethodAttributes ma = 0;
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;
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;
146 if ((mod_flags & SEALED) != 0)
147 ma |= MethodAttributes.Final;
148 if ((mod_flags & VIRTUAL) != 0)
149 ma |= MethodAttributes.Virtual;
151 if ((mod_flags & OVERRIDE) != 0)
152 ma |= MethodAttributes.Virtual;
154 if ((mod_flags & NEW) != 0)
155 ma |= MethodAttributes.HideBySig;
161 // Checks the object @mod modifiers to be in @allowed.
162 // Returns the new mask. Side effect: reports any
163 // incorrect attributes.
165 public static int Check (int allowed, int mod, int def_access)
167 int invalid_flags = (~allowed) & mod;
170 if (invalid_flags == 0){
174 // If no accessibility bits provided
175 // then provide the defaults.
177 if ((mod & Accessibility) == 0){
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)
190 a = ((a & 2) >> 1) + (a & 5);
191 a = ((a & 4) >> 2) + (a & 3);
193 CSharpParser.error (107, "More than one protection modifier specified");
198 for (i = 1; i < TOP; i <<= 1){
199 if ((i & invalid_flags) == 0)
202 CSharpParser.error (106, "the modifier `" + Name (i) + "' is not valid for this item");
205 return allowed & mod;