2 // modifiers.cs: Modifier handling.
5 using System.Reflection;
7 namespace Mono.CSharp {
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 VOLATILE = 0x1000;
27 public const int UNSAFE = 0x2000;
28 public const int TOP = 0x2000;
30 public const int PROPERTY_CUSTOM = 0x4000; // Custom property modifier
31 public const int PARTIAL = 0x20000;
34 // We use this internally to flag that the method contains an iterator
36 public const int METHOD_YIELDS = 0x8000;
37 public const int METHOD_GENERIC = 0x10000;
39 public const int Accessibility =
40 PUBLIC | PROTECTED | INTERNAL | PRIVATE;
41 public const int AllowedExplicitImplFlags =
44 static public string Name (int i)
51 case Modifiers.PUBLIC:
53 case Modifiers.PROTECTED:
54 s = "protected"; break;
55 case Modifiers.INTERNAL:
56 s = "internal"; break;
57 case Modifiers.PRIVATE:
59 case Modifiers.ABSTRACT:
60 s = "abstract"; break;
61 case Modifiers.SEALED:
63 case Modifiers.STATIC:
65 case Modifiers.READONLY:
66 s = "readonly"; break;
67 case Modifiers.VIRTUAL:
69 case Modifiers.OVERRIDE:
70 s = "override"; break;
71 case Modifiers.EXTERN:
73 case Modifiers.VOLATILE:
74 s = "volatile"; break;
75 case Modifiers.UNSAFE:
82 public static string GetDescription (MethodAttributes ma)
84 if ((ma & MethodAttributes.Assembly) != 0)
87 if ((ma & MethodAttributes.Family) != 0)
90 if ((ma & MethodAttributes.Public) != 0)
93 if ((ma & MethodAttributes.FamANDAssem) != 0)
94 return "protected internal";
96 if ((ma & MethodAttributes.Private) != 0)
99 throw new NotImplementedException (ma.ToString ());
102 public static TypeAttributes TypeAttr (int mod_flags, bool is_toplevel)
104 TypeAttributes t = 0;
107 if ((mod_flags & PUBLIC) != 0)
108 t |= TypeAttributes.Public;
109 if ((mod_flags & PRIVATE) != 0)
110 t |= TypeAttributes.NotPublic;
112 if ((mod_flags & PUBLIC) != 0)
113 t |= TypeAttributes.NestedPublic;
114 if ((mod_flags & PRIVATE) != 0)
115 t |= TypeAttributes.NestedPrivate;
116 if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
117 t |= TypeAttributes.NestedFamORAssem;
118 if ((mod_flags & PROTECTED) != 0)
119 t |= TypeAttributes.NestedFamily;
120 if ((mod_flags & INTERNAL) != 0)
121 t |= TypeAttributes.NestedAssembly;
124 if ((mod_flags & SEALED) != 0)
125 t |= TypeAttributes.Sealed;
126 if ((mod_flags & ABSTRACT) != 0)
127 t |= TypeAttributes.Abstract;
132 public static TypeAttributes TypeAttr (int mod_flags, TypeContainer caller)
134 TypeAttributes t = TypeAttr (mod_flags, caller.IsTopLevel);
136 // If we do not have static constructors, static methods
137 // can be invoked without initializing the type.
138 if (!caller.UserDefinedStaticConstructor &&
139 (caller.Kind != Kind.Interface))
140 t |= TypeAttributes.BeforeFieldInit;
145 public static FieldAttributes FieldAttr (int mod_flags)
147 FieldAttributes fa = 0;
149 if ((mod_flags & PUBLIC) != 0)
150 fa |= FieldAttributes.Public;
151 if ((mod_flags & PRIVATE) != 0)
152 fa |= FieldAttributes.Private;
153 if ((mod_flags & PROTECTED) != 0){
154 if ((mod_flags & INTERNAL) != 0)
155 fa |= FieldAttributes.FamORAssem;
157 fa |= FieldAttributes.Family;
159 if ((mod_flags & INTERNAL) != 0)
160 fa |= FieldAttributes.Assembly;
163 if ((mod_flags & STATIC) != 0)
164 fa |= FieldAttributes.Static;
165 if ((mod_flags & READONLY) != 0)
166 fa |= FieldAttributes.InitOnly;
171 public static MethodAttributes MethodAttr (int mod_flags)
173 MethodAttributes ma = MethodAttributes.HideBySig;
175 if ((mod_flags & PUBLIC) != 0)
176 ma |= MethodAttributes.Public;
177 if ((mod_flags & PRIVATE) != 0)
178 ma |= MethodAttributes.Private;
179 if ((mod_flags & PROTECTED) != 0){
180 if ((mod_flags & INTERNAL) != 0)
181 ma |= MethodAttributes.FamORAssem;
183 ma |= MethodAttributes.Family;
185 if ((mod_flags & INTERNAL) != 0)
186 ma |= MethodAttributes.Assembly;
189 if ((mod_flags & STATIC) != 0)
190 ma |= MethodAttributes.Static;
191 if ((mod_flags & ABSTRACT) != 0){
192 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual;
194 if ((mod_flags & SEALED) != 0)
195 ma |= MethodAttributes.Final;
197 if ((mod_flags & VIRTUAL) != 0)
198 ma |= MethodAttributes.Virtual;
200 if ((mod_flags & OVERRIDE) != 0)
201 ma |= MethodAttributes.Virtual;
203 if ((ma & MethodAttributes.Virtual) != 0)
204 ma |= MethodAttributes.NewSlot;
211 // Checks the object @mod modifiers to be in @allowed.
212 // Returns the new mask. Side effect: reports any
213 // incorrect attributes.
215 public static int Check (int allowed, int mod, int def_access, Location l)
217 int invalid_flags = (~allowed) & mod;
220 if (invalid_flags == 0){
223 if ((mod & Modifiers.UNSAFE) != 0){
224 RootContext.CheckUnsafeOption (l);
228 // If no accessibility bits provided
229 // then provide the defaults.
231 if ((mod & Accessibility) == 0){
237 // Make sure that no conflicting accessibility
238 // bits have been set. Protected+Internal is
239 // allowed, that is why they are placed on bits
240 // 1 and 4 (so the shift 3 basically merges them)
244 a = ((a & 2) >> 1) + (a & 5);
245 a = ((a & 4) >> 2) + (a & 3);
247 Report.Error (107, l, "More than one protection modifier specified");
252 for (i = 1; i <= TOP; i <<= 1){
253 if ((i & invalid_flags) == 0)
256 Error_InvalidModifier (l, Name (i));
259 return allowed & mod;
262 public static void Error_InvalidModifier (Location l, string name)
264 Report.Error (106, l, "The modifier `" + name + "' is not valid for this item");