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 Accessibility =
31 PUBLIC | PROTECTED | INTERNAL | PRIVATE;
33 static public string Name (int i)
40 case Modifiers.PUBLIC:
42 case Modifiers.PROTECTED:
43 s = "protected"; break;
44 case Modifiers.INTERNAL:
45 s = "internal"; break;
46 case Modifiers.PRIVATE:
48 case Modifiers.ABSTRACT:
49 s = "abstract"; break;
50 case Modifiers.SEALED:
52 case Modifiers.STATIC:
54 case Modifiers.READONLY:
55 s = "readonly"; break;
56 case Modifiers.VIRTUAL:
58 case Modifiers.OVERRIDE:
59 s = "override"; break;
60 case Modifiers.EXTERN:
62 case Modifiers.VOLATILE:
63 s = "volatile"; break;
69 public static TypeAttributes TypeAttr (int mod_flags, bool is_toplevel)
74 if ((mod_flags & PUBLIC) != 0)
75 t |= TypeAttributes.Public;
76 if ((mod_flags & PRIVATE) != 0)
77 t |= TypeAttributes.NotPublic;
79 if ((mod_flags & PUBLIC) != 0)
80 t |= TypeAttributes.NestedPublic;
81 if ((mod_flags & PRIVATE) != 0)
82 t |= TypeAttributes.NestedPrivate;
83 if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
84 t |= TypeAttributes.NestedFamORAssem;
85 if ((mod_flags & PROTECTED) != 0)
86 t |= TypeAttributes.NestedFamily;
87 if ((mod_flags & INTERNAL) != 0)
88 t |= TypeAttributes.NestedAssembly;
91 if ((mod_flags & SEALED) != 0)
92 t |= TypeAttributes.Sealed;
93 if ((mod_flags & ABSTRACT) != 0)
94 t |= TypeAttributes.Abstract;
99 public static TypeAttributes TypeAttr (int mod_flags, TypeContainer caller)
101 TypeAttributes t = TypeAttr (mod_flags, caller.IsTopLevel);
103 // If we do not have static constructors, static methods
104 // can be invoked without initializing the type.
105 if (!caller.HaveStaticConstructor)
106 t |= TypeAttributes.BeforeFieldInit;
111 public static FieldAttributes FieldAttr (int mod_flags)
113 FieldAttributes fa = 0;
115 if ((mod_flags & PUBLIC) != 0)
116 fa |= FieldAttributes.Public;
117 if ((mod_flags & PRIVATE) != 0)
118 fa |= FieldAttributes.Private;
119 if ((mod_flags & PROTECTED) != 0){
120 if ((mod_flags & INTERNAL) != 0)
121 fa |= FieldAttributes.FamORAssem;
123 fa |= FieldAttributes.Family;
125 if ((mod_flags & INTERNAL) != 0)
126 fa |= FieldAttributes.Assembly;
129 if ((mod_flags & STATIC) != 0)
130 fa |= FieldAttributes.Static;
131 if ((mod_flags & READONLY) != 0)
132 fa |= FieldAttributes.InitOnly;
137 public static MethodAttributes MethodAttr (int mod_flags)
139 MethodAttributes ma = 0;
141 if ((mod_flags & PUBLIC) != 0)
142 ma |= MethodAttributes.Public;
143 if ((mod_flags & PRIVATE) != 0)
144 ma |= MethodAttributes.Private;
145 if ((mod_flags & PROTECTED) != 0){
146 if ((mod_flags & INTERNAL) != 0)
147 ma |= MethodAttributes.FamORAssem;
149 ma |= MethodAttributes.Family;
151 if ((mod_flags & INTERNAL) != 0)
152 ma |= MethodAttributes.Assembly;
155 if ((mod_flags & STATIC) != 0)
156 ma |= MethodAttributes.Static;
157 if ((mod_flags & ABSTRACT) != 0){
158 ma |= MethodAttributes.Abstract | MethodAttributes.Virtual |
159 MethodAttributes.HideBySig;
161 if ((mod_flags & SEALED) != 0)
162 ma |= MethodAttributes.Final;
164 if ((mod_flags & VIRTUAL) != 0)
165 ma |= MethodAttributes.Virtual;
167 if ((mod_flags & OVERRIDE) != 0)
168 ma |= MethodAttributes.Virtual | MethodAttributes.HideBySig;
170 if ((ma & MethodAttributes.Virtual) != 0)
171 ma |= MethodAttributes.NewSlot;
174 if ((mod_flags & NEW) != 0)
175 ma |= MethodAttributes.HideBySig;
181 // Checks the object @mod modifiers to be in @allowed.
182 // Returns the new mask. Side effect: reports any
183 // incorrect attributes.
185 public static int Check (int allowed, int mod, int def_access, Location l)
187 int invalid_flags = (~allowed) & mod;
190 if (invalid_flags == 0){
193 if ((mod & Modifiers.UNSAFE) != 0){
194 if (!RootContext.Unsafe){
195 Report.Error (227, l,
196 "Unsafe code requires the --unsafe command " +
197 "line option to be specified");
202 // If no accessibility bits provided
203 // then provide the defaults.
205 if ((mod & Accessibility) == 0){
211 // Make sure that no conflicting accessibility
212 // bits have been set. Protected+Internal is
213 // allowed, that is why they are placed on bits
214 // 1 and 4 (so the shift 3 basically merges them)
218 a = ((a & 2) >> 1) + (a & 5);
219 a = ((a & 4) >> 2) + (a & 3);
221 Report.Error (107, l, "More than one protection modifier specified");
226 for (i = 1; i < TOP; i <<= 1){
227 if ((i & invalid_flags) == 0)
230 Error_InvalidModifier (l, Name (i));
233 return allowed & mod;
236 public static void Error_InvalidModifier (Location l, string name)
238 Report.Error (106, l, "the modifier " + name + " is not valid for this item");