// System.MonoCustomAttrs.cs
// Hooks into the runtime to get custom attributes for reflection handles
//
-// Paolo Molaro (lupus@ximian.com)
+// Authors:
+// Paolo Molaro (lupus@ximian.com)
+// Gonzalo Paniagua Javier (gonzalo@ximian.com)
+//
+// (c) 2002,2003 Ximian, Inc. (http://www.ximian.com)
+//
+
+//
+// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
-// (c) 2002 Ximian, Inc.
using System;
using System.Reflection;
using System.Collections;
using System.Runtime.CompilerServices;
-namespace System {
- internal class MonoCustomAttrs {
+namespace System
+{
+ internal class MonoCustomAttrs
+ {
+ [MethodImplAttribute (MethodImplOptions.InternalCall)]
+ internal static extern object[] GetCustomAttributesInternal (ICustomAttributeProvider obj, bool pseudoAttrs);
+
+ internal static object[] GetCustomAttributesBase (ICustomAttributeProvider obj)
+ {
+ object[] attrs = GetCustomAttributesInternal (obj, false);
- static Hashtable handle_to_attrs = new Hashtable ();
+#if NET_2_0 || BOOTSTRAP_NET_2_0
+ object[] pseudoAttrs = null;
- [MethodImplAttribute(MethodImplOptions.InternalCall)]
- internal static extern object[] GetCustomAttributes (ICustomAttributeProvider obj);
+ /* FIXME: Add other types */
+ if (obj is Type)
+ pseudoAttrs = ((Type)obj).GetPseudoCustomAttributes ();
+ else if (obj is MonoMethod)
+ pseudoAttrs = ((MonoMethod)obj).GetPseudoCustomAttributes ();
+ else if (obj is FieldInfo)
+ pseudoAttrs = ((FieldInfo)obj).GetPseudoCustomAttributes ();
+ else if (obj is ParameterInfo)
+ pseudoAttrs = ((ParameterInfo)obj).GetPseudoCustomAttributes ();
- private static object[] from_cache (ICustomAttributeProvider obj) {
- object[] res = (object[])handle_to_attrs [obj];
- if (res != null)
+ if (pseudoAttrs != null) {
+ object[] res = new object [attrs.Length + pseudoAttrs.Length];
+ System.Array.Copy (attrs, res, attrs.Length);
+ System.Array.Copy (pseudoAttrs, 0, res, attrs.Length, pseudoAttrs.Length);
return res;
- res = GetCustomAttributes (obj);
- handle_to_attrs.Add (obj, res);
- return res;
+ }
+ else
+ return attrs;
+#else
+ return attrs;
+#endif
+ }
+
+ internal static Attribute GetCustomAttribute (ICustomAttributeProvider obj,
+ Type attributeType,
+ bool inherit)
+ {
+ object[] res = GetCustomAttributes (obj, attributeType, inherit);
+ if (res.Length == 0)
+ {
+ return null;
+ }
+ else if (res.Length > 1)
+ {
+ string msg = "'{0}' has more than one attribute of type '{1}";
+ msg = String.Format (msg, obj, attributeType);
+ throw new AmbiguousMatchException (msg);
+ }
+
+ return (Attribute) res[0];
}
- internal static object[] GetCustomAttributes (ICustomAttributeProvider obj, Type attributeType, bool inherit) {
- // handle inherit
- object[] res = from_cache (obj);
+ internal static object[] GetCustomAttributes (ICustomAttributeProvider obj, Type attributeType, bool inherit)
+ {
+ if (obj == null)
+ throw new ArgumentNullException ("obj");
+
+ object[] r;
+ object[] res = GetCustomAttributesBase (obj);
// shortcut
- if (res.Length == 1 && res[0].GetType () == attributeType)
- return res;
- ArrayList a = new ArrayList ();
- foreach (object attr in res) {
- if (attributeType.Equals (attr.GetType ()))
- a.Add (attr);
+ if (!inherit && res.Length == 1)
+ {
+ if (attributeType != null)
+ {
+ if (attributeType.IsAssignableFrom (res[0].GetType ()))
+ {
+ r = (object[]) Array.CreateInstance (attributeType, 1);
+ r[0] = res[0];
+ }
+ else
+ {
+ r = (object[]) Array.CreateInstance (attributeType, 0);
+ }
+ }
+ else
+ {
+ r = (object[]) Array.CreateInstance (res[0].GetType (), 1);
+ r[0] = res[0];
+ }
+ return r;
+ }
+
+ // if AttributeType is sealed, and Inherited is set to false, then
+ // there's no use in scanning base types
+ if ((attributeType != null && attributeType.IsSealed) && inherit)
+ {
+ AttributeUsageAttribute usageAttribute = RetrieveAttributeUsage (
+ attributeType);
+ if (!usageAttribute.Inherited)
+ {
+ inherit = false;
+ }
+ }
+
+ int initialSize = res.Length < 16 ? res.Length : 16;
+
+ Hashtable attributeInfos = new Hashtable (initialSize);
+ ArrayList a = new ArrayList (initialSize);
+ ICustomAttributeProvider btype = obj;
+
+ int inheritanceLevel = 0;
+
+ do
+ {
+ foreach (object attr in res)
+ {
+ AttributeUsageAttribute usage;
+
+ Type attrType = attr.GetType ();
+ if (attributeType != null)
+ {
+ if (!attributeType.IsAssignableFrom (attrType))
+ {
+ continue;
+ }
+ }
+
+ AttributeInfo firstAttribute = (AttributeInfo) attributeInfos[attrType];
+ if (firstAttribute != null)
+ {
+ usage = firstAttribute.Usage;
+ }
+ else
+ {
+ usage = RetrieveAttributeUsage (attrType);
+ }
+
+ // only add attribute to the list of attributes if
+ // - we are on the first inheritance level, or the attribute can be inherited anyway
+ // and (
+ // - multiple attributes of the type are allowed
+ // or (
+ // - this is the first attribute we've discovered
+ // or
+ // - the attribute is on same inheritance level than the first
+ // attribute that was discovered for this attribute type ))
+ if ((inheritanceLevel == 0 || usage.Inherited) && (usage.AllowMultiple ||
+ (firstAttribute == null || (firstAttribute != null
+ && firstAttribute.InheritanceLevel == inheritanceLevel))))
+ {
+ a.Add (attr);
+ }
+
+ if (firstAttribute == null)
+ {
+ attributeInfos.Add (attrType, new AttributeInfo (usage, inheritanceLevel));
+ }
+ }
+
+ if ((btype = GetBase (btype)) != null)
+ {
+ inheritanceLevel++;
+ res = GetCustomAttributesBase (btype);
+ }
+ } while (inherit && btype != null);
+
+ object[] array = null;
+ if (attributeType == null || attributeType.IsValueType)
+ {
+ array = (object[]) Array.CreateInstance (typeof(Attribute), a.Count);
}
- return a.ToArray ();
+ else
+ {
+ array = Array.CreateInstance (attributeType, a.Count) as object[];
+ }
+
+ // copy attributes to array
+ a.CopyTo (array, 0);
+
+ return array;
}
- internal static object[] GetCustomAttributes (ICustomAttributeProvider obj, bool inherit) {
- // handle inherit
- return from_cache (obj);
+ internal static object[] GetCustomAttributes (ICustomAttributeProvider obj, bool inherit)
+ {
+ if (obj == null)
+ throw new ArgumentNullException ("obj");
+
+ if (!inherit)
+ return (object[]) GetCustomAttributesBase (obj).Clone ();
+
+ return GetCustomAttributes (obj, null, inherit);
}
- internal static bool IsDefined (ICustomAttributeProvider obj, Type attributeType, bool inherit) {
- // handle inherit
- object[] res = from_cache (obj);
- foreach (object attr in res) {
+
+ internal static bool IsDefined (ICustomAttributeProvider obj, Type attributeType, bool inherit)
+ {
+ object [] res = GetCustomAttributesBase (obj);
+ foreach (object attr in res)
if (attributeType.Equals (attr.GetType ()))
return true;
- }
+
+ ICustomAttributeProvider btype;
+ if (inherit && ((btype = GetBase (obj)) != null))
+ return IsDefined (btype, attributeType, inherit);
+
return false;
}
+
+ // Handles Type, MonoProperty and MonoMethod.
+ // The runtime has also cases for MonoEvent, MonoField, Assembly and ParameterInfo,
+ // but for those we return null here.
+ static ICustomAttributeProvider GetBase (ICustomAttributeProvider obj)
+ {
+ if (obj == null)
+ return null;
+
+ if (obj is Type)
+ return ((Type) obj).BaseType;
+
+ MethodInfo method = null;
+ if (obj is MonoProperty)
+ {
+ MonoProperty prop = (MonoProperty) obj;
+ method = prop.GetGetMethod (true);
+ if (method == null)
+ method = prop.GetSetMethod (true);
+ }
+ else if (obj is MonoMethod)
+ {
+ method = (MethodInfo) obj;
+ }
+
+ /**
+ * ParameterInfo -> null
+ * Assembly -> null
+ * MonoEvent -> null
+ * MonoField -> null
+ */
+ if (method == null || !method.IsVirtual)
+ return null;
+
+ MethodInfo baseMethod = method.GetBaseDefinition ();
+ if (baseMethod == method)
+ return null;
+
+ return baseMethod;
+ }
+
+ private static AttributeUsageAttribute RetrieveAttributeUsage (Type attributeType)
+ {
+ if (attributeType == typeof (AttributeUsageAttribute))
+ /* Avoid endless recursion */
+ return new AttributeUsageAttribute (AttributeTargets.Class);
+
+ AttributeUsageAttribute usageAttribute = null;
+ object[] attribs = GetCustomAttributes (attributeType,
+ MonoCustomAttrs.AttributeUsageType, false);
+ if (attribs.Length == 0)
+ {
+ // if no AttributeUsage was defined on the attribute level, then
+ // try to retrieve if from its base type
+ if (attributeType.BaseType != null)
+ {
+ usageAttribute = RetrieveAttributeUsage (attributeType.BaseType);
+
+ }
+ if (usageAttribute != null)
+ {
+ // return AttributeUsage of base class
+ return usageAttribute;
+
+ }
+ // return default AttributeUsageAttribute if no AttributeUsage
+ // was defined on attribute, or its base class
+ return DefaultAttributeUsage;
+ }
+ // check if more than one AttributeUsageAttribute has been specified
+ // on the type
+ // NOTE: compilers should prevent this, but that doesn't prevent
+ // anyone from using IL ofcourse
+ if (attribs.Length > 1)
+ {
+ throw new FormatException ("Duplicate AttributeUsageAttribute cannot be specified on an attribute type.");
+ }
+
+ return ((AttributeUsageAttribute) attribs[0]);
+ }
+
+ private static readonly Type AttributeUsageType = typeof(AttributeUsageAttribute);
+ private static readonly AttributeUsageAttribute DefaultAttributeUsage =
+ new AttributeUsageAttribute (AttributeTargets.All);
+
+ private class AttributeInfo
+ {
+ private AttributeUsageAttribute _usage;
+ private int _inheritanceLevel;
+
+ public AttributeInfo (AttributeUsageAttribute usage, int inheritanceLevel)
+ {
+ _usage = usage;
+ _inheritanceLevel = inheritanceLevel;
+ }
+
+ public AttributeUsageAttribute Usage
+ {
+ get
+ {
+ return _usage;
+ }
+ }
+
+ public int InheritanceLevel
+ {
+ get
+ {
+ return _inheritanceLevel;
+ }
+ }
+ }
}
}
+