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//
// modifiers.cs: Modifiers handling
//
// Authors: Miguel de Icaza (miguel@gnu.org)
// Marek Safar (marek.safar@gmail.com)
//
// Dual licensed under the terms of the MIT X11 or GNU GPL
//
// Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
// Copyright 2004-2010 Novell, Inc
//
using System;
#if STATIC
using IKVM.Reflection;
#else
using System.Reflection;
#endif
namespace Mono.CSharp
{
[Flags]
public enum Modifiers
{
PROTECTED = 0x0001,
PUBLIC = 0x0002,
PRIVATE = 0x0004,
INTERNAL = 0x0008,
NEW = 0x0010,
ABSTRACT = 0x0020,
SEALED = 0x0040,
STATIC = 0x0080,
READONLY = 0x0100,
VIRTUAL = 0x0200,
OVERRIDE = 0x0400,
EXTERN = 0x0800,
VOLATILE = 0x1000,
UNSAFE = 0x2000,
ASYNC = 0x4000,
TOP = 0x8000,
//
// Compiler specific flags
//
PROPERTY_CUSTOM = 0x10000,
PARTIAL = 0x20000,
DEFAULT_ACCESS_MODIFER = 0x40000,
METHOD_EXTENSION = 0x80000,
COMPILER_GENERATED = 0x100000,
BACKING_FIELD = 0x200000,
DEBUGGER_HIDDEN = 0x400000,
AccessibilityMask = PUBLIC | PROTECTED | INTERNAL | PRIVATE,
AllowedExplicitImplFlags = UNSAFE | EXTERN,
}
static class ModifiersExtensions
{
public static string AccessibilityName (Modifiers mod)
{
switch (mod & Modifiers.AccessibilityMask) {
case Modifiers.PUBLIC:
return "public";
case Modifiers.PROTECTED:
return "protected";
case Modifiers.PROTECTED | Modifiers.INTERNAL:
return "protected internal";
case Modifiers.INTERNAL:
return "internal";
case Modifiers.PRIVATE:
return "private";
default:
throw new NotImplementedException (mod.ToString ());
}
}
static public string Name (Modifiers 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;
case Modifiers.UNSAFE:
s = "unsafe"; break;
case Modifiers.ASYNC:
s = "async"; break;
}
return s;
}
//
// Used by custom property accessors to check whether @modA is more restrictive than @modB
//
public static bool IsRestrictedModifier (Modifiers modA, Modifiers modB)
{
Modifiers flags = 0;
if ((modB & Modifiers.PUBLIC) != 0) {
flags = Modifiers.PROTECTED | Modifiers.INTERNAL | Modifiers.PRIVATE;
} else if ((modB & Modifiers.PROTECTED) != 0) {
if ((modB & Modifiers.INTERNAL) != 0)
flags = Modifiers.PROTECTED | Modifiers.INTERNAL;
flags |= Modifiers.PRIVATE;
} else if ((modB & Modifiers.INTERNAL) != 0)
flags = Modifiers.PRIVATE;
return modB != modA && (modA & (~flags)) == 0;
}
public static TypeAttributes TypeAttr (Modifiers mod_flags, bool is_toplevel)
{
TypeAttributes t = 0;
if (is_toplevel){
if ((mod_flags & Modifiers.PUBLIC) != 0)
t = TypeAttributes.Public;
else if ((mod_flags & Modifiers.PRIVATE) != 0)
t = TypeAttributes.NotPublic;
} else {
if ((mod_flags & Modifiers.PUBLIC) != 0)
t = TypeAttributes.NestedPublic;
else if ((mod_flags & Modifiers.PRIVATE) != 0)
t = TypeAttributes.NestedPrivate;
else if ((mod_flags & (Modifiers.PROTECTED | Modifiers.INTERNAL)) == (Modifiers.PROTECTED | Modifiers.INTERNAL))
t = TypeAttributes.NestedFamORAssem;
else if ((mod_flags & Modifiers.PROTECTED) != 0)
t = TypeAttributes.NestedFamily;
else if ((mod_flags & Modifiers.INTERNAL) != 0)
t = TypeAttributes.NestedAssembly;
}
if ((mod_flags & Modifiers.SEALED) != 0)
t |= TypeAttributes.Sealed;
if ((mod_flags & Modifiers.ABSTRACT) != 0)
t |= TypeAttributes.Abstract;
return t;
}
public static FieldAttributes FieldAttr (Modifiers mod_flags)
{
FieldAttributes fa = 0;
if ((mod_flags & Modifiers.PUBLIC) != 0)
fa |= FieldAttributes.Public;
if ((mod_flags & Modifiers.PRIVATE) != 0)
fa |= FieldAttributes.Private;
if ((mod_flags & Modifiers.PROTECTED) != 0) {
if ((mod_flags & Modifiers.INTERNAL) != 0)
fa |= FieldAttributes.FamORAssem;
else
fa |= FieldAttributes.Family;
} else {
if ((mod_flags & Modifiers.INTERNAL) != 0)
fa |= FieldAttributes.Assembly;
}
if ((mod_flags & Modifiers.STATIC) != 0)
fa |= FieldAttributes.Static;
if ((mod_flags & Modifiers.READONLY) != 0)
fa |= FieldAttributes.InitOnly;
return fa;
}
public static MethodAttributes MethodAttr (Modifiers mod_flags)
{
MethodAttributes ma = MethodAttributes.HideBySig;
switch (mod_flags & Modifiers.AccessibilityMask) {
case Modifiers.PUBLIC:
ma |= MethodAttributes.Public;
break;
case Modifiers.PRIVATE:
ma |= MethodAttributes.Private;
break;
case Modifiers.PROTECTED | Modifiers.INTERNAL:
ma |= MethodAttributes.FamORAssem;
break;
case Modifiers.PROTECTED:
ma |= MethodAttributes.Family;
break;
case Modifiers.INTERNAL:
ma |= MethodAttributes.Assembly;
break;
default:
throw new NotImplementedException (mod_flags.ToString ());
}
if ((mod_flags & Modifiers.STATIC) != 0)
ma |= MethodAttributes.Static;
if ((mod_flags & Modifiers.ABSTRACT) != 0) {
ma |= MethodAttributes.Abstract | MethodAttributes.Virtual;
}
if ((mod_flags & Modifiers.SEALED) != 0)
ma |= MethodAttributes.Final;
if ((mod_flags & Modifiers.VIRTUAL) != 0)
ma |= MethodAttributes.Virtual;
if ((mod_flags & Modifiers.OVERRIDE) != 0) {
ma |= MethodAttributes.Virtual;
} else {
if ((ma & MethodAttributes.Virtual) != 0)
ma |= MethodAttributes.NewSlot;
}
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 Modifiers Check (Modifiers allowed, Modifiers mod, Modifiers def_access, Location l, Report Report)
{
int invalid_flags = (~(int) allowed) & ((int) mod & ((int) Modifiers.TOP - 1));
int i;
if (invalid_flags == 0){
//
// If no accessibility bits provided
// then provide the defaults.
//
if ((mod & Modifiers.AccessibilityMask) == 0) {
mod |= def_access;
if (def_access != 0)
mod |= Modifiers.DEFAULT_ACCESS_MODIFER;
return mod;
}
return mod;
}
for (i = 1; i < (int) Modifiers.TOP; i <<= 1) {
if ((i & invalid_flags) == 0)
continue;
Error_InvalidModifier ((Modifiers)i, l, Report);
}
return allowed & mod;
}
static void Error_InvalidModifier (Modifiers mod, Location l, Report Report)
{
Report.Error (106, l, "The modifier `{0}' is not valid for this item",
Name (mod));
}
}
}
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