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//
// modifiers.cs: Modifier handling.
//
using System;
using System.Reflection;
namespace Mono.CSharp {
public class Modifiers {
//
// The ordering of the following 4 constants
// has been carefully done.
//
public const int PROTECTED = 0x0001;
public const int PUBLIC = 0x0002;
public const int PRIVATE = 0x0004;
public const int INTERNAL = 0x0008;
public const int NEW = 0x0010;
public const int ABSTRACT = 0x0020;
public const int SEALED = 0x0040;
public const int STATIC = 0x0080;
public const int READONLY = 0x0100;
public const int VIRTUAL = 0x0200;
public const int OVERRIDE = 0x0400;
public const int EXTERN = 0x0800;
public const int VOLATILE = 0x1000;
public const int UNSAFE = 0x2000;
public const int TOP = 0x2000;
public const int Accessibility =
PUBLIC | PROTECTED | INTERNAL | PRIVATE;
static public string Name (int i)
{
string s = "";
switch (i) {
case Modifiers.NEW:
s = "new"; break;
case Modifiers.PUBLIC:
s = "public"; break;
case Modifiers.PROTECTED:
s = "protected"; break;
case Modifiers.INTERNAL:
s = "internal"; break;
case Modifiers.PRIVATE:
s = "private"; break;
case Modifiers.ABSTRACT:
s = "abstract"; break;
case Modifiers.SEALED:
s = "sealed"; break;
case Modifiers.STATIC:
s = "static"; break;
case Modifiers.READONLY:
s = "readonly"; break;
case Modifiers.VIRTUAL:
s = "virtual"; break;
case Modifiers.OVERRIDE:
s = "override"; break;
case Modifiers.EXTERN:
s = "extern"; break;
case Modifiers.VOLATILE:
s = "volatile"; break;
}
return s;
}
public static TypeAttributes TypeAttr (int mod_flags, TypeContainer caller)
{
TypeAttributes t = 0;
bool top_level = caller.IsTopLevel;
if (top_level){
if ((mod_flags & PUBLIC) != 0)
t |= TypeAttributes.Public;
if ((mod_flags & PRIVATE) != 0)
t |= TypeAttributes.NotPublic;
} else {
if ((mod_flags & PUBLIC) != 0)
t |= TypeAttributes.NestedPublic;
if ((mod_flags & PRIVATE) != 0)
t |= TypeAttributes.NestedPrivate;
if ((mod_flags & PROTECTED) != 0 && (mod_flags & INTERNAL) != 0)
t |= TypeAttributes.NestedFamORAssem;
if ((mod_flags & PROTECTED) != 0)
t |= TypeAttributes.NestedFamily;
if ((mod_flags & INTERNAL) != 0)
t |= TypeAttributes.NestedAssembly;
}
if ((mod_flags & SEALED) != 0)
t |= TypeAttributes.Sealed;
if ((mod_flags & ABSTRACT) != 0)
t |= TypeAttributes.Abstract;
// If we do not have static constructors, static methods
// can be invoked without initializing the type.
if (!caller.HaveStaticConstructor)
t |= TypeAttributes.BeforeFieldInit;
return t;
}
public static FieldAttributes FieldAttr (int mod_flags)
{
FieldAttributes fa = 0;
if ((mod_flags & PUBLIC) != 0)
fa |= FieldAttributes.Public;
if ((mod_flags & PRIVATE) != 0)
fa |= FieldAttributes.Private;
if ((mod_flags & PROTECTED) != 0){
if ((mod_flags & INTERNAL) != 0)
fa |= FieldAttributes.FamORAssem;
else
fa |= FieldAttributes.Family;
} else {
if ((mod_flags & INTERNAL) != 0)
fa |= FieldAttributes.Assembly;
}
if ((mod_flags & STATIC) != 0)
fa |= FieldAttributes.Static;
if ((mod_flags & READONLY) != 0)
fa |= FieldAttributes.InitOnly;
return fa;
}
public static MethodAttributes MethodAttr (int mod_flags)
{
MethodAttributes ma = 0;
if ((mod_flags & PUBLIC) != 0)
ma |= MethodAttributes.Public;
if ((mod_flags & PRIVATE) != 0)
ma |= MethodAttributes.Private;
if ((mod_flags & PROTECTED) != 0){
if ((mod_flags & INTERNAL) != 0)
ma |= MethodAttributes.FamORAssem;
else
ma |= MethodAttributes.Family;
} else {
if ((mod_flags & INTERNAL) != 0)
ma |= MethodAttributes.Assembly;
}
if ((mod_flags & STATIC) != 0)
ma |= MethodAttributes.Static;
if ((mod_flags & ABSTRACT) != 0){
ma |= MethodAttributes.Abstract | MethodAttributes.Virtual |
MethodAttributes.HideBySig;
}
if ((mod_flags & SEALED) != 0)
ma |= MethodAttributes.Final;
if ((mod_flags & VIRTUAL) != 0)
ma |= MethodAttributes.Virtual;
if ((mod_flags & OVERRIDE) != 0)
ma |= MethodAttributes.Virtual | MethodAttributes.HideBySig;
else {
if ((ma & MethodAttributes.Virtual) != 0)
ma |= MethodAttributes.NewSlot;
}
if ((mod_flags & NEW) != 0)
ma |= MethodAttributes.HideBySig;
return ma;
}
// <summary>
// Checks the object @mod modifiers to be in @allowed.
// Returns the new mask. Side effect: reports any
// incorrect attributes.
// </summary>
public static int Check (int allowed, int mod, int def_access, Location l)
{
int invalid_flags = (~allowed) & mod;
int i;
if (invalid_flags == 0){
int a = mod;
if ((mod & Modifiers.UNSAFE) != 0){
if (!RootContext.Unsafe){
Report.Error (227, l,
"Unsafe code requires the --unsafe command " +
"line option to be specified");
}
}
//
// If no accessibility bits provided
// then provide the defaults.
//
if ((mod & Accessibility) == 0){
mod |= def_access;
return mod;
}
//
// Make sure that no conflicting accessibility
// bits have been set. Protected+Internal is
// allowed, that is why they are placed on bits
// 1 and 4 (so the shift 3 basically merges them)
//
a &= 15;
a |= (a >> 3);
a = ((a & 2) >> 1) + (a & 5);
a = ((a & 4) >> 2) + (a & 3);
if (a > 1)
Report.Error (107, l, "More than one protection modifier specified");
return mod;
}
for (i = 1; i < TOP; i <<= 1){
if ((i & invalid_flags) == 0)
continue;
Report.Error (106, l, "the modifier `" + Name (i) +
"' is not valid for this item");
}
return allowed & mod;
}
}
}
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