2010-04-07 Jb Evain <jbevain@novell.com>

[mcs.git] / mcs / membercache.cs

//
// membercache.cs: A container for all member lookups
//
// Author: 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 Ximian, Inc (http://www.ximian.com)
// Copyright 2004-2010 Novell, Inc
//
//

using System;
using System.Text;
using System.Collections.Generic;
using System.Globalization;
using System.Reflection.Emit;
using System.Reflection;

namespace Mono.CSharp {

        [Flags]
        public enum MemberKind
        {
                Constructor = 1,
                Event = 1 << 1,
                Field = 1 << 2,
                Method = 1 << 3,
                Property = 1 << 4,
                Indexer = 1 << 5,
                Operator = 1 << 6,
                Destructor      = 1 << 7,
                //Constant = 1 << 8,

                NestedType      = 1 << 10,

                Class           = 1 << 11,
                Struct          = 1 << 12,
                Delegate        = 1 << 13,
                Enum            = 1 << 14,
                Interface       = 1 << 15,

                MaskType = Constructor | Event | Field | Method | Property | NestedType | Indexer | Operator | Destructor,
                All = MaskType
        }

        [Flags]
        public enum BindingRestriction
        {
                None = 0,

                // Member has to be accessible
                AccessibleOnly = 1,

                // Inspect only queried type members
                DeclaredOnly = 1 << 1,

                // Excluded static
                InstanceOnly = 1 << 2,

                // 
                NoOverloadableOverrides = 1 << 3
        }
/*
        public struct MemberFilter : IEquatable<MemberCore>
        {
                public readonly string Name;
                public readonly MemberKind Kind;
                public readonly TypeSpec[] Parameters;
                public readonly TypeSpec MemberType;

                public MemberFilter (IMethod m)
                {
                        Name = m.MethodBuilder.Name;
                        Kind = MemberKind.Method;
                        Parameters = m.Parameters.Types;
                        MemberType = m.ReturnType;
                }

                public MemberFilter (string name, MemberKind kind)
                {
                        Name = name;
                        Kind = kind;
                        Parameters = null;
                        MemberType = null;
                }

                public MemberFilter (string name, MemberKind kind, TypeSpec[] param, TypeSpec type)
                        : this (name, kind)
                {
                        Name = name;
                        Kind = kind;
                        Parameters = param;
                        MemberType = type;
                }

                public static MemberFilter Constuctor (TypeSpec[] param)
                {
                        return new MemberFilter (System.Reflection.ConstructorInfo.ConstructorName, MemberKind.Constructor, param, null);
                }

                public static MemberFilter Property (string name, TypeSpec type)
                {
                        return new MemberFilter (name, MemberKind.Property, null, type);
                }

                public static MemberFilter Field (string name, TypeSpec type)
                {
                        return new MemberFilter (name, MemberKind.Field, null, type);
                }

                public static MemberFilter Method (string name, TypeSpec[] param, TypeSpec type)
                {
                        return new MemberFilter (name, MemberKind.Method, param, type);
                }

                #region IEquatable<MemberCore> Members

                public bool Equals (MemberCore other)
                {
                        // Is the member of the correct type ?
                        if ((other.MemberKind & Kind & MemberKind.MaskType) == 0)
                                return false;

                        if (Parameters != null) {
                                if (other is IParametersMember) {
                                        AParametersCollection other_param = ((IParametersMember) other).Parameters;
                                        if (TypeSpecArrayComparer.Default.Equals (Parameters, other_param.Types))
                                                return true;
                                }

                                return false;
                        }

                        if (MemberType != null) {
                                //throw new NotImplementedException ();
                        }

                        return true;
                }

                #endregion
        }
*/ 
        /// <summary>
        ///   This is a readonly list of MemberInfo's.      
        /// </summary>
        public class MemberList : IList<MemberInfo> {
                public readonly IList<MemberInfo> List;
                int count;

                /// <summary>
                ///   Create a new MemberList from the given IList.
                /// </summary>
                public MemberList (IList<MemberInfo> list)
                {
                        if (list != null)
                                this.List = list;
                        else
                                this.List = new List<MemberInfo> ();
                        count = List.Count;
                }

                /// <summary>
                ///   Concatenate the ILists `first' and `second' to a new MemberList.
                /// </summary>
                public MemberList (IList<MemberInfo> first, IList<MemberInfo> second)
                {
                        var list = new List<MemberInfo> ();
                        list.AddRange (first);
                        list.AddRange (second);
                        count = list.Count;
                        List = list;
                }

                public static readonly MemberList Empty = new MemberList (Array.AsReadOnly (new MemberInfo[0]));

                /// <summary>
                ///   Cast the MemberList into a MemberInfo[] array.
                /// </summary>
                /// <remarks>
                ///   This is an expensive operation, only use it if it's really necessary.
                /// </remarks>
                public static explicit operator MemberInfo [] (MemberList list)
                {
                        Timer.StartTimer (TimerType.MiscTimer);
                        MemberInfo [] result = new MemberInfo [list.Count];
                        list.CopyTo (result, 0);
                        Timer.StopTimer (TimerType.MiscTimer);
                        return result;
                }

                // ICollection

                public int Count {
                        get {
                                return count;
                        }
                }

                public void CopyTo (MemberInfo[] array, int index)
                {
                        List.CopyTo (array, index);
                }

                // IEnumerable

                public IEnumerator<MemberInfo> GetEnumerator ()
                {
                        return List.GetEnumerator ();
                }

                System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator ()
                {
                        return List.GetEnumerator ();
                }

                // IList

                public bool IsFixedSize {
                        get {
                                return true;
                        }
                }

                public bool IsReadOnly {
                        get {
                                return true;
                        }
                }

                MemberInfo IList<MemberInfo>.this [int index] {
                        get {
                                return List [index];
                        }

                        set {
                                throw new NotSupportedException ();
                        }
                }

                // FIXME: try to find out whether we can avoid the cast in this indexer.
                public MemberInfo this [int index] {
                        get {
                                return (MemberInfo) List [index];
                        }
                }

                public void Add (MemberInfo value)
                {
                        throw new NotSupportedException ();
                }

                public void Clear ()
                {
                        throw new NotSupportedException ();
                }

                public bool Contains (MemberInfo value)
                {
                        return List.Contains (value);
                }

                public int IndexOf (MemberInfo value)
                {
                        return List.IndexOf (value);
                }

                public void Insert (int index, MemberInfo value)
                {
                        throw new NotSupportedException ();
                }

                public bool Remove (MemberInfo value)
                {
                        throw new NotSupportedException ();
                }

                public void RemoveAt (int index)
                {
                        throw new NotSupportedException ();
                }
        }

        /// <summary>
        ///   This interface is used to get all members of a class when creating the
        ///   member cache.  It must be implemented by all DeclSpace derivatives which
        ///   want to support the member cache and by TypeHandle to get caching of
        ///   non-dynamic types.
        /// </summary>
        public interface IMemberContainer {
                /// <summary>
                ///   The name of the IMemberContainer.  This is only used for
                ///   debugging purposes.
                /// </summary>
                string Name {
                        get;
                }

                /// <summary>
                ///   The type of this IMemberContainer.
                /// </summary>
                Type Type {
                        get;
                }

                /// <summary>
                ///   Returns the IMemberContainer of the base class or null if this
                ///   is an interface or TypeManger.object_type.
                ///   This is used when creating the member cache for a class to get all
                ///   members from the base class.
                /// </summary>
                MemberCache BaseCache {
                        get;
                }

                /// <summary>
                ///   Whether this is an interface.
                /// </summary>
                bool IsInterface {
                        get;
                }

                /// <summary>
                ///   Returns all members of this class with the corresponding MemberTypes
                ///   and BindingFlags.
                /// </summary>
                /// <remarks>
                ///   When implementing this method, make sure not to return any inherited
                ///   members and check the MemberTypes and BindingFlags properly.
                ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
                ///   get the BindingFlags (static/non-static,public/non-public) in the
                ///   MemberInfo class, but the cache needs this information.  That's why
                ///   this method is called multiple times with different BindingFlags.
                /// </remarks>
                MemberList GetMembers (MemberTypes mt, BindingFlags bf);
        }

        /// <summary>
        ///   The MemberCache is used by dynamic and non-dynamic types to speed up
        ///   member lookups.  It has a member name based hash table; it maps each member
        ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
        ///   and the BindingFlags that were initially used to get it.  The cache contains
        ///   all members of the current class and all inherited members.  If this cache is
        ///   for an interface types, it also contains all inherited members.
        ///
        ///   There are two ways to get a MemberCache:
        ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
        ///     use the DeclSpace.MemberCache property.
        ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
        ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
        /// </summary>
        public class MemberCache {
                public readonly IMemberContainer Container;
                protected Dictionary<string, List<CacheEntry>> member_hash;
                protected Dictionary<string, List<CacheEntry>> method_hash;

                Dictionary<string, object> locase_table;

                static List<MethodInfo> overrides = new List<MethodInfo> ();

                /// <summary>
                ///   Create a new MemberCache for the given IMemberContainer `container'.
                /// </summary>
                public MemberCache (IMemberContainer container)
                {
                        this.Container = container;

                        Timer.IncrementCounter (CounterType.MemberCache);
                        Timer.StartTimer (TimerType.CacheInit);

                        // If we have a base class (we have a base class unless we're
                        // TypeManager.object_type), we deep-copy its MemberCache here.
                        if (Container.BaseCache != null)
                                member_hash = SetupCache (Container.BaseCache);
                        else
                                member_hash = new Dictionary<string, List<CacheEntry>> ();

                        // If this is neither a dynamic type nor an interface, create a special
                        // method cache with all declared and inherited methods.
                        Type type = container.Type;
                        if (!(type is TypeBuilder) && !type.IsInterface &&
                            // !(type.IsGenericType && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
                            !TypeManager.IsGenericType (type) && !TypeManager.IsGenericParameter (type) &&
                            (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
                                        method_hash = new Dictionary<string, List<CacheEntry>> ();
                                        AddMethods (type);
                        }

                        // Add all members from the current class.
                        AddMembers (Container);

                        Timer.StopTimer (TimerType.CacheInit);
                }

                public MemberCache (Type baseType, IMemberContainer container)
                {
                        this.Container = container;
                        if (baseType == null)
                                this.member_hash = new Dictionary<string, List<CacheEntry>> ();
                        else
                                this.member_hash = SetupCache (TypeManager.LookupMemberCache (baseType));
                }

                public MemberCache (Type[] ifaces)
                {
                        //
                        // The members of this cache all belong to other caches.  
                        // So, 'Container' will not be used.
                        //
                        this.Container = null;

                        member_hash = new Dictionary<string, List<CacheEntry>> ();
                        if (ifaces == null)
                                return;

                        foreach (Type itype in ifaces)
                                AddCacheContents (TypeManager.LookupMemberCache (itype));
                }

                public MemberCache (IMemberContainer container, Type base_class, Type[] ifaces)
                {
                        this.Container = container;

                        // If we have a base class (we have a base class unless we're
                        // TypeManager.object_type), we deep-copy its MemberCache here.
                        if (Container.BaseCache != null)
                                member_hash = SetupCache (Container.BaseCache);
                        else
                                member_hash = new Dictionary<string, List<CacheEntry>> ();

                        if (base_class != null)
                                AddCacheContents (TypeManager.LookupMemberCache (base_class));
                        if (ifaces != null) {
                                foreach (Type itype in ifaces) {
                                        MemberCache cache = TypeManager.LookupMemberCache (itype);
                                        if (cache != null)
                                                AddCacheContents (cache);
                                }
                        }
                }

                /// <summary>
                ///   Bootstrap this member cache by doing a deep-copy of our base.
                /// </summary>
                static Dictionary<string, List<CacheEntry>> SetupCache (MemberCache base_class)
                {
                        if (base_class == null)
                                return new Dictionary<string, List<CacheEntry>> ();

                        var hash = new Dictionary<string, List<CacheEntry>> (base_class.member_hash.Count);
                        var it = base_class.member_hash.GetEnumerator ();
                        while (it.MoveNext ()) {
                                hash.Add (it.Current.Key, new List<CacheEntry> (it.Current.Value));
                        }
                                
                        return hash;
                }
                
                //
                // Converts ModFlags to BindingFlags
                //
                static BindingFlags GetBindingFlags (Modifiers modifiers)
                {
                        BindingFlags bf;
                        if ((modifiers & Modifiers.STATIC) != 0)
                                bf = BindingFlags.Static;
                        else
                                bf = BindingFlags.Instance;

                        if ((modifiers & Modifiers.PRIVATE) != 0)
                                bf |= BindingFlags.NonPublic;
                        else
                                bf |= BindingFlags.Public;

                        return bf;
                }               

                /// <summary>
                ///   Add the contents of `cache' to the member_hash.
                /// </summary>
                void AddCacheContents (MemberCache cache)
                {
                        var it = cache.member_hash.GetEnumerator ();
                        while (it.MoveNext ()) {
                                List<CacheEntry> list;
                                if (!member_hash.TryGetValue (it.Current.Key, out list))
                                        member_hash [it.Current.Key] = list = new List<CacheEntry> ();

                                var entries = it.Current.Value;
                                for (int i = entries.Count-1; i >= 0; i--) {
                                        var entry = entries [i];

                                        if (entry.Container != cache.Container)
                                                break;
                                        list.Add (entry);
                                }
                        }
                }

                /// <summary>
                ///   Add all members from class `container' to the cache.
                /// </summary>
                void AddMembers (IMemberContainer container)
                {
                        // We need to call AddMembers() with a single member type at a time
                        // to get the member type part of CacheEntry.EntryType right.
                        if (!container.IsInterface) {
                                AddMembers (MemberTypes.Constructor, container);
                                AddMembers (MemberTypes.Field, container);
                        }
                        AddMembers (MemberTypes.Method, container);
                        AddMembers (MemberTypes.Property, container);
                        AddMembers (MemberTypes.Event, container);
                        // Nested types are returned by both Static and Instance searches.
                        AddMembers (MemberTypes.NestedType,
                                    BindingFlags.Static | BindingFlags.Public, container);
                        AddMembers (MemberTypes.NestedType,
                                    BindingFlags.Static | BindingFlags.NonPublic, container);
                }

                void AddMembers (MemberTypes mt, IMemberContainer container)
                {
                        AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
                        AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
                        AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
                        AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
                }

                public void AddMember (MemberInfo mi, MemberSpec mc)
                {
                        AddMember (mi.MemberType, GetBindingFlags (mc.Modifiers), Container, mi.Name, mi);
                }

                public void AddGenericMember (MemberInfo mi, InterfaceMemberBase mc)
                {
                        AddMember (mi.MemberType, GetBindingFlags (mc.ModFlags), Container,
                                MemberName.MakeName (mc.GetFullName (mc.MemberName), mc.MemberName.TypeArguments), mi);
                }

                public void AddNestedType (DeclSpace type)
                {
                        AddMember (MemberTypes.NestedType, GetBindingFlags (type.ModFlags), (IMemberContainer) type.Parent,
                                type.TypeBuilder.Name, type.TypeBuilder);
                }

                public void AddInterface (MemberCache baseCache)
                {
                        if (baseCache.member_hash.Count > 0)
                                AddCacheContents (baseCache);
                }

                void AddMember (MemberTypes mt, BindingFlags bf, IMemberContainer container,
                                string name, MemberInfo member)
                {
                        // We use a name-based hash table of ArrayList's.
                        List<CacheEntry> list;
                        if (!member_hash.TryGetValue (name, out list)) {
                                list = new List<CacheEntry> (1);
                                member_hash.Add (name, list);
                        }

                        // When this method is called for the current class, the list will
                        // already contain all inherited members from our base classes.
                        // We cannot add new members in front of the list since this'd be an
                        // expensive operation, that's why the list is sorted in reverse order
                        // (ie. members from the current class are coming last).
                        list.Add (new CacheEntry (container, member, mt, bf));
                }

                /// <summary>
                ///   Add all members from class `container' with the requested MemberTypes and
                ///   BindingFlags to the cache.  This method is called multiple times with different
                ///   MemberTypes and BindingFlags.
                /// </summary>
                void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
                {
                        MemberList members = container.GetMembers (mt, bf);

                        foreach (MemberInfo member in members) {
                                string name = member.Name;

                                AddMember (mt, bf, container, name, member);

                                if (member is MethodInfo) {
                                        string gname = TypeManager.GetMethodName ((MethodInfo) member);
                                        if (gname != name)
                                                AddMember (mt, bf, container, gname, member);
                                }
                        }
                }

                /// <summary>
                ///   Add all declared and inherited methods from class `type' to the method cache.
                /// </summary>
                void AddMethods (Type type)
                {
                        AddMethods (BindingFlags.Static | BindingFlags.Public |
                                    BindingFlags.FlattenHierarchy, type);
                        AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
                                    BindingFlags.FlattenHierarchy, type);
                        AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
                        AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
                }

                void AddMethods (BindingFlags bf, Type type)
                {
                        MethodBase [] members = type.GetMethods (bf);

                        Array.Reverse (members);

                        foreach (MethodBase member in members) {
                                string name = member.Name;

                                // We use a name-based hash table of ArrayList's.
                                List<CacheEntry> list;
                                if (!method_hash.TryGetValue (name, out list)) {
                                        list = new List<CacheEntry> (1);
                                        method_hash.Add (name, list);
                                }

                                MethodInfo curr = (MethodInfo) member;
                                while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
                                        MethodInfo base_method = curr.GetBaseDefinition ();

                                        if (base_method == curr)
                                                // Not every virtual function needs to have a NewSlot flag.
                                                break;

                                        overrides.Add (curr);
                                        list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
                                        curr = base_method;
                                }

                                if (overrides.Count > 0) {
                                        for (int i = 0; i < overrides.Count; ++i)
                                                TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
                                        overrides.Clear ();
                                }

                                // Unfortunately, the elements returned by Type.GetMethods() aren't
                                // sorted so we need to do this check for every member.
                                BindingFlags new_bf = bf;
                                if (member.DeclaringType == type)
                                        new_bf |= BindingFlags.DeclaredOnly;

                                list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
                        }
                }

                /// <summary>
                ///   Compute and return a appropriate `EntryType' magic number for the given
                ///   MemberTypes and BindingFlags.
                /// </summary>
                protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
                {
                        EntryType type = EntryType.None;

                        if ((mt & MemberTypes.Constructor) != 0)
                                type |= EntryType.Constructor;
                        if ((mt & MemberTypes.Event) != 0)
                                type |= EntryType.Event;
                        if ((mt & MemberTypes.Field) != 0)
                                type |= EntryType.Field;
                        if ((mt & MemberTypes.Method) != 0)
                                type |= EntryType.Method;
                        if ((mt & MemberTypes.Property) != 0)
                                type |= EntryType.Property;
                        // Nested types are returned by static and instance searches.
                        if ((mt & MemberTypes.NestedType) != 0)
                                type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;

                        if ((bf & BindingFlags.Instance) != 0)
                                type |= EntryType.Instance;
                        if ((bf & BindingFlags.Static) != 0)
                                type |= EntryType.Static;
                        if ((bf & BindingFlags.Public) != 0)
                                type |= EntryType.Public;
                        if ((bf & BindingFlags.NonPublic) != 0)
                                type |= EntryType.NonPublic;
                        if ((bf & BindingFlags.DeclaredOnly) != 0)
                                type |= EntryType.Declared;

                        return type;
                }

                /// <summary>
                ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
                ///   denote multiple member types.  Returns true if the given flags value denotes a
                ///   single member types.
                /// </summary>
                public static bool IsSingleMemberType (MemberTypes mt)
                {
                        switch (mt) {
                        case MemberTypes.Constructor:
                        case MemberTypes.Event:
                        case MemberTypes.Field:
                        case MemberTypes.Method:
                        case MemberTypes.Property:
                        case MemberTypes.NestedType:
                                return true;

                        default:
                                return false;
                        }
                }

                /// <summary>
                ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
                ///   number to speed up the searching process.
                /// </summary>
                [Flags]
                public enum EntryType {
                        None            = 0x000,

                        Instance        = 0x001,
                        Static          = 0x002,
                        MaskStatic      = Instance|Static,

                        Public          = 0x004,
                        NonPublic       = 0x008,
                        MaskProtection  = Public|NonPublic,

                        Declared        = 0x010,

                        Constructor     = 0x020,
                        Event           = 0x040,
                        Field           = 0x080,
                        Method          = 0x100,
                        Property        = 0x200,
                        NestedType      = 0x400,

                        NotExtensionMethod      = 0x800,

                        MaskType        = Constructor|Event|Field|Method|Property|NestedType
                }

                public class CacheEntry {
                        public readonly IMemberContainer Container;
                        public EntryType EntryType;
                        public readonly MemberInfo Member;

                        public CacheEntry (IMemberContainer container, MemberInfo member,
                                           MemberTypes mt, BindingFlags bf)
                        {
                                this.Container = container;
                                this.Member = member;
                                this.EntryType = GetEntryType (mt, bf);
                        }

                        public override string ToString ()
                        {
                                return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
                                                      EntryType, Member);
                        }
                }

                /// <summary>
                ///   This is called each time we're walking up one level in the class hierarchy
                ///   and checks whether we can abort the search since we've already found what
                ///   we were looking for.
                /// </summary>
                protected bool DoneSearching (IList<MemberInfo> list)
                {
                        //
                        // We've found exactly one member in the current class and it's not
                        // a method or constructor.
                        //
                        if (list.Count == 1 && !(list [0] is MethodBase))
                                return true;

                        //
                        // Multiple properties: we query those just to find out the indexer
                        // name
                        //
                        if ((list.Count > 0) && (list [0] is PropertyInfo))
                                return true;

                        return false;
                }

                /// <summary>
                ///   Looks up members with name `name'.  If you provide an optional
                ///   filter function, it'll only be called with members matching the
                ///   requested member name.
                ///
                ///   This method will try to use the cache to do the lookup if possible.
                ///
                ///   Unlike other FindMembers implementations, this method will always
                ///   check all inherited members - even when called on an interface type.
                ///
                ///   If you know that you're only looking for methods, you should use
                ///   MemberTypes.Method alone since this speeds up the lookup a bit.
                ///   When doing a method-only search, it'll try to use a special method
                ///   cache (unless it's a dynamic type or an interface) and the returned
                ///   MemberInfo's will have the correct ReflectedType for inherited methods.
                ///   The lookup process will automatically restart itself in method-only
                ///   search mode if it discovers that it's about to return methods.
                /// </summary>
                List<MemberInfo> global = new List<MemberInfo> ();
                bool using_global;
                
                static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
                
                public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
                                                  MemberFilter filter, object criteria)
                {
                        if (using_global)
                                throw new Exception ();

                        bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
                        bool method_search = mt == MemberTypes.Method;
                        // If we have a method cache and we aren't already doing a method-only search,
                        // then we restart a method search if the first match is a method.
                        bool do_method_search = !method_search && (method_hash != null);

                        List<CacheEntry> applicable;

                        // If this is a method-only search, we try to use the method cache if
                        // possible; a lookup in the method cache will return a MemberInfo with
                        // the correct ReflectedType for inherited methods.
                        
                        if (method_search && (method_hash != null))
                                method_hash.TryGetValue (name, out applicable);
                        else
                                member_hash.TryGetValue (name, out applicable);

                        if (applicable == null)
                                return emptyMemberInfo;

                        //
                        // 32  slots gives 53 rss/54 size
                        // 2/4 slots gives 55 rss
                        //
                        // Strange: from 25,000 calls, only 1,800
                        // are above 2.  Why does this impact it?
                        //
                        global.Clear ();
                        using_global = true;

                        Timer.StartTimer (TimerType.CachedLookup);

                        EntryType type = GetEntryType (mt, bf);

                        IMemberContainer current = Container;

                        bool do_interface_search = current.IsInterface;

                        // `applicable' is a list of all members with the given member name `name'
                        // in the current class and all its base classes.  The list is sorted in
                        // reverse order due to the way how the cache is initialy created (to speed
                        // things up, we're doing a deep-copy of our base).

                        for (int i = applicable.Count-1; i >= 0; i--) {
                                CacheEntry entry = (CacheEntry) applicable [i];

                                // This happens each time we're walking one level up in the class
                                // hierarchy.  If we're doing a DeclaredOnly search, we must abort
                                // the first time this happens (this may already happen in the first
                                // iteration of this loop if there are no members with the name we're
                                // looking for in the current class).
                                if (entry.Container != current) {
                                        if (declared_only)
                                                break;

                                        if (!do_interface_search && DoneSearching (global))
                                                break;

                                        current = entry.Container;
                                }

                                // Is the member of the correct type ?
                                if ((entry.EntryType & type & EntryType.MaskType) == 0)
                                        continue;

                                // Is the member static/non-static ?
                                if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
                                        continue;

                                // Apply the filter to it.
                                if (filter (entry.Member, criteria)) {
                                        if ((entry.EntryType & EntryType.MaskType) != EntryType.Method) {
                                                do_method_search = false;
                                        }
                                        
                                        // Because interfaces support multiple inheritance we have to be sure that
                                        // base member is from same interface, so only top level member will be returned
                                        if (do_interface_search && global.Count > 0) {
                                                bool member_already_exists = false;

                                                foreach (MemberInfo mi in global) {
                                                        if (mi is MethodBase)
                                                                continue;

                                                        if (IsInterfaceBaseInterface (TypeManager.GetInterfaces (mi.DeclaringType), entry.Member.DeclaringType)) {
                                                                member_already_exists = true;
                                                                break;
                                                        }
                                                }
                                                if (member_already_exists)
                                                        continue;
                                        }

                                        global.Add (entry.Member);
                                }
                        }

                        Timer.StopTimer (TimerType.CachedLookup);

                        // If we have a method cache and we aren't already doing a method-only
                        // search, we restart in method-only search mode if the first match is
                        // a method.  This ensures that we return a MemberInfo with the correct
                        // ReflectedType for inherited methods.
                        if (do_method_search && (global.Count > 0)){
                                using_global = false;

                                return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
                        }

                        using_global = false;
                        MemberInfo [] copy = new MemberInfo [global.Count];
                        global.CopyTo (copy);
                        return copy;
                }

                /// <summary>
                /// Returns true if iterface exists in any base interfaces (ifaces)
                /// </summary>
                static bool IsInterfaceBaseInterface (Type[] ifaces, Type ifaceToFind)
                {
                        foreach (Type iface in ifaces) {
                                if (iface == ifaceToFind)
                                        return true;

                                Type[] base_ifaces = TypeManager.GetInterfaces (iface);
                                if (base_ifaces.Length > 0 && IsInterfaceBaseInterface (base_ifaces, ifaceToFind))
                                        return true;
                        }
                        return false;
                }
                
                // find the nested type @name in @this.
                public Type FindNestedType (string name)
                {
                        List<CacheEntry> applicable;
                        if (!member_hash.TryGetValue (name, out applicable))
                                return null;
                        
                        for (int i = applicable.Count-1; i >= 0; i--) {
                                CacheEntry entry = applicable [i];
                                if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
                                        return (Type) entry.Member;
                        }
                        
                        return null;
                }

                public MemberInfo FindBaseEvent (Type invocation_type, string name)
                {
                        List<CacheEntry> applicable;
                        if (!member_hash.TryGetValue (name, out applicable))
                                return null;

                        //
                        // Walk the chain of events, starting from the top.
                        //
                        for (int i = applicable.Count - 1; i >= 0; i--) 
                        {
                                CacheEntry entry = applicable [i];
                                if ((entry.EntryType & EntryType.Event) == 0)
                                        continue;
                                
                                EventInfo ei = (EventInfo)entry.Member;
                                return ei.GetAddMethod (true);
                        }

                        return null;
                }

                //
                // Looks for extension methods with defined name and extension type
                //
                public List<MethodSpec> FindExtensionMethods (Assembly thisAssembly, Type extensionType, string name, bool publicOnly)
                {
                        List<CacheEntry> entries;
                        if (method_hash != null)
                                method_hash.TryGetValue (name, out entries);
                        else {
                                member_hash.TryGetValue (name, out entries);
                        }

                        if (entries == null)
                                return null;

                        EntryType entry_type = EntryType.Static | EntryType.Method | EntryType.NotExtensionMethod;
                        EntryType found_entry_type = entry_type & ~EntryType.NotExtensionMethod;

                        List<MethodSpec> candidates = null;
                        foreach (CacheEntry entry in entries) {
                                if ((entry.EntryType & entry_type) == found_entry_type) {
                                        MethodBase mb = (MethodBase)entry.Member;

                                        // Simple accessibility check
                                        if ((entry.EntryType & EntryType.Public) == 0 && publicOnly) {
                                                MethodAttributes ma = mb.Attributes & MethodAttributes.MemberAccessMask;
                                                if (ma != MethodAttributes.Assembly && ma != MethodAttributes.FamORAssem)
                                                        continue;
                                                
                                                if (!TypeManager.IsThisOrFriendAssembly (thisAssembly, mb.DeclaringType.Assembly))
                                                        continue;
                                        }

                                        IMethodData md = TypeManager.GetMethod (mb);
                                        AParametersCollection pd = md == null ?
                                                TypeManager.GetParameterData (mb) : md.ParameterInfo;

                                        Type ex_type = pd.ExtensionMethodType;
                                        if (ex_type == null) {
                                                entry.EntryType |= EntryType.NotExtensionMethod;
                                                continue;
                                        }

                                        if (candidates == null)
                                                candidates = new List<MethodSpec> (2);
                                        candidates.Add (Import.CreateMethod (mb));
                                }
                        }

                        return candidates;
                }
                
                //
                // This finds the method or property for us to override. invocation_type is the type where
                // the override is going to be declared, name is the name of the method/property, and
                // param_types is the parameters, if any to the method or property
                //
                // Because the MemberCache holds members from this class and all the base classes,
                // we can avoid tons of reflection stuff.
                //
                public MemberInfo FindMemberToOverride (Type invocation_type, string name, AParametersCollection parameters, GenericMethod generic_method, bool is_property)
                {
                        List<CacheEntry> applicable;
                        if (method_hash != null && !is_property)
                                method_hash.TryGetValue (name, out applicable);
                        else
                                member_hash.TryGetValue (name, out applicable);
                        
                        if (applicable == null)
                                return null;
                        //
                        // Walk the chain of methods, starting from the top.
                        //
                        for (int i = applicable.Count - 1; i >= 0; i--) {
                                CacheEntry entry = applicable [i];
                                
                                if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
                                        continue;

                                PropertyInfo pi = null;
                                MethodInfo mi = null;
                                FieldInfo fi = null;
                                AParametersCollection cmp_attrs;
                                
                                if (is_property) {
                                        if ((entry.EntryType & EntryType.Field) != 0) {
                                                fi = (FieldInfo)entry.Member;
                                                cmp_attrs = ParametersCompiled.EmptyReadOnlyParameters;
                                        } else {
                                                pi = (PropertyInfo) entry.Member;
                                                cmp_attrs = TypeManager.GetParameterData (pi);
                                        }
                                } else {
                                        mi = (MethodInfo) entry.Member;
                                        cmp_attrs = TypeManager.GetParameterData (mi);
                                }

                                if (fi != null) {
                                        // TODO: Almost duplicate !
                                        // Check visibility
                                        switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
                                        case FieldAttributes.PrivateScope:
                                                continue;
                                        case FieldAttributes.Private:
                                                //
                                                // A private method is Ok if we are a nested subtype.
                                                // The spec actually is not very clear about this, see bug 52458.
                                                //
                                                if (!invocation_type.Equals (entry.Container.Type) &&
                                                    !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
                                                        continue;
                                                break;
                                        case FieldAttributes.FamANDAssem:
                                        case FieldAttributes.Assembly:
                                                //
                                                // Check for assembly methods
                                                //
                                                if (fi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
                                                        continue;
                                                break;
                                        }
                                        return entry.Member;
                                }

                                //
                                // Check the arguments
                                //
                                if (cmp_attrs.Count != parameters.Count)
                                        continue;
        
                                int j;
                                for (j = 0; j < cmp_attrs.Count; ++j) {
                                        //
                                        // LAMESPEC: No idea why `params' modifier is ignored
                                        //
                                        if ((parameters.FixedParameters [j].ModFlags & ~Parameter.Modifier.PARAMS) != 
                                                (cmp_attrs.FixedParameters [j].ModFlags & ~Parameter.Modifier.PARAMS))
                                                break;

                                        if (!TypeManager.IsEqual (parameters.Types [j], cmp_attrs.Types [j]))
                                                break;
                                }

                                if (j < cmp_attrs.Count)
                                        continue;

                                //
                                // check generic arguments for methods
                                //
                                if (mi != null) {
                                        Type [] cmpGenArgs = TypeManager.GetGenericArguments (mi);
                                        if (generic_method == null && cmpGenArgs != null && cmpGenArgs.Length != 0)
                                                continue;
                                        if (generic_method != null && cmpGenArgs != null && cmpGenArgs.Length != generic_method.TypeParameters.Length)
                                                continue;
                                }

                                //
                                // get one of the methods because this has the visibility info.
                                //
                                if (is_property) {
                                        mi = pi.GetGetMethod (true);
                                        if (mi == null)
                                                mi = pi.GetSetMethod (true);
                                }
                                
                                //
                                // Check visibility
                                //
                                switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
                                case MethodAttributes.PrivateScope:
                                        continue;
                                case MethodAttributes.Private:
                                        //
                                        // A private method is Ok if we are a nested subtype.
                                        // The spec actually is not very clear about this, see bug 52458.
                                        //
                                        if (!invocation_type.Equals (entry.Container.Type) &&
                                            !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
                                                continue;
                                        break;
                                case MethodAttributes.FamANDAssem:
                                case MethodAttributes.Assembly:
                                        //
                                        // Check for assembly methods
                                        //
                                        if (!TypeManager.IsThisOrFriendAssembly (invocation_type.Assembly, mi.DeclaringType.Assembly))
                                                continue;
                                        break;
                                }
                                return entry.Member;
                        }
                        
                        return null;
                }

                /// <summary>
                /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
                /// We handle two cases. The first is for types without parameters (events, field, properties).
                /// The second are methods, indexers and this is why ignore_complex_types is here.
                /// The latest param is temporary hack. See DoDefineMembers method for more info.
                /// </summary>
                public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
                {
                        List<CacheEntry> applicable = null;
 
                        if (method_hash != null)
                                method_hash.TryGetValue (name, out applicable);
 
                        if (applicable != null) {
                                for (int i = applicable.Count - 1; i >= 0; i--) {
                                        CacheEntry entry = (CacheEntry) applicable [i];
                                        if ((entry.EntryType & EntryType.Public) != 0)
                                                return entry.Member;
                                }
                        }
 
                        if (member_hash == null)
                                return null;

                        if (member_hash.TryGetValue (name, out applicable)) {
                                for (int i = applicable.Count - 1; i >= 0; i--) {
                                        CacheEntry entry = (CacheEntry) applicable [i];
                                        if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
                                                if (ignore_complex_types) {
                                                        if ((entry.EntryType & EntryType.Method) != 0)
                                                                continue;
 
                                                        // Does exist easier way how to detect indexer ?
                                                        if ((entry.EntryType & EntryType.Property) != 0) {
                                                                AParametersCollection arg_types = TypeManager.GetParameterData ((PropertyInfo)entry.Member);
                                                                if (arg_types.Count > 0)
                                                                        continue;
                                                        }
                                                }
                                                return entry.Member;
                                        }
                                }
                        }
                        return null;
                }


                /// <summary>
                /// Builds low-case table for CLS Compliance test
                /// </summary>
                public Dictionary<string, object> GetPublicMembers ()
                {
                        if (locase_table != null)
                                return locase_table;

                        locase_table = new Dictionary<string, object> ();
                        foreach (var entry in member_hash) {
                                var members = entry.Value;
                                for (int ii = 0; ii < members.Count; ++ii) {
                                        CacheEntry member_entry = members [ii];
 
                                        if ((member_entry.EntryType & EntryType.Public) == 0)
                                                continue;
 
                                        // TODO: Does anyone know easier way how to detect that member is internal ?
                                        switch (member_entry.EntryType & EntryType.MaskType) {
                                        case EntryType.Constructor:
                                                continue;
                                                
                                        case EntryType.Field:
                                                if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
                                                        continue;
                                                break;
                                                
                                        case EntryType.Method:
                                                if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
                                                        continue;
                                                break;
                                                
                                        case EntryType.Property:
                                                PropertyInfo pi = (PropertyInfo)member_entry.Member;
                                                if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
                                                        continue;
                                                break;
                                                
                                        case EntryType.Event:
                                                EventInfo ei = (EventInfo)member_entry.Member;
                                                MethodInfo mi = ei.GetAddMethod ();
                                                if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
                                                        continue;
                                                break;
                                        }
                                        string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
                                        locase_table [lcase] = member_entry.Member;
                                        break;
                                }
                        }
                        return locase_table;
                }
 
                public IDictionary<string, List<CacheEntry>> Members {
                        get {
                                return member_hash;
                        }
                }
 
                /// <summary>
                /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
                /// </summary>
                /// 
                // TODO: refactor as method is always 'this'
                public static void VerifyClsParameterConflict (IList<CacheEntry> al, MethodCore method, MemberInfo this_builder, Report Report)
                {
                        EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
 
                        for (int i = 0; i < al.Count; ++i) {
                                var entry = al [i];
                
                                // skip itself
                                if (entry.Member == this_builder)
                                        continue;
                
                                if ((entry.EntryType & tested_type) != tested_type)
                                        continue;
                
                                MethodBase method_to_compare = (MethodBase)entry.Member;
                                AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
                                        method.Parameters, TypeManager.GetParameterData (method_to_compare));

                                if (result == AttributeTester.Result.Ok)
                                        continue;

                                IMethodData md = TypeManager.GetMethod (method_to_compare);

                                // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
                                // However it is exactly what csc does.
                                if (md != null && !md.IsClsComplianceRequired ())
                                        continue;
                
                                Report.SymbolRelatedToPreviousError (entry.Member);
                                switch (result) {
                                case AttributeTester.Result.RefOutArrayError:
                                        Report.Warning (3006, 1, method.Location,
                                                        "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant",
                                                        method.GetSignatureForError ());
                                        continue;
                                case AttributeTester.Result.ArrayArrayError:
                                        Report.Warning (3007, 1, method.Location,
                                                        "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant",
                                                        method.GetSignatureForError ());
                                        continue;
                                }

                                throw new NotImplementedException (result.ToString ());
                        }
                }

                public bool CheckExistingMembersOverloads (MemberCore member, string name, ParametersCompiled parameters, Report Report)
                {
                        List<CacheEntry> entries;
                        if (!member_hash.TryGetValue (name, out entries))
                                return true;

                        int method_param_count = parameters.Count;
                        for (int i = entries.Count - 1; i >= 0; --i) {
                                CacheEntry ce = (CacheEntry) entries [i];

                                if (ce.Container != member.Parent.PartialContainer)
                                        return true;

                                Type [] p_types;
                                AParametersCollection pd;
                                if ((ce.EntryType & EntryType.Property) != 0) {
                                        pd = TypeManager.GetParameterData ((PropertyInfo) ce.Member);
                                        p_types = pd.Types;
                                } else {
                                        MethodBase mb = (MethodBase) ce.Member;
                
                                        // TODO: This is more like a hack, because we are adding generic methods
                                        // twice with and without arity name
                                        if (TypeManager.IsGenericMethod (mb) && !member.MemberName.IsGeneric)
                                                continue;

                                        pd = TypeManager.GetParameterData (mb);
                                        p_types = pd.Types;
                                }

                                if (p_types.Length != method_param_count)
                                        continue;

                                if (method_param_count > 0) {
                                        int ii = method_param_count - 1;
                                        Type type_a, type_b;
                                        do {
                                                type_a = parameters.Types [ii];
                                                type_b = p_types [ii];

                                                if (TypeManager.IsGenericParameter (type_a) && type_a.DeclaringMethod != null)
                                                        type_a = typeof (TypeParameter);

                                                if (TypeManager.IsGenericParameter (type_b) && type_b.DeclaringMethod != null)
                                                        type_b = typeof (TypeParameter);

                                                if ((pd.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF) !=
                                                        (parameters.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF))
                                                        break;

                                        } while (TypeManager.IsEqual (type_a, type_b) && ii-- != 0);

                                        if (ii >= 0)
                                                continue;

                                        //
                                        // Operators can differ in return type only
                                        //
                                        if (member is Operator) {
                                                Operator op = TypeManager.GetMethod ((MethodBase) ce.Member) as Operator;
                                                if (op != null && op.ReturnType != ((Operator) member).ReturnType)
                                                        continue;
                                        }

                                        //
                                        // Report difference in parameter modifiers only
                                        //
                                        if (pd != null && member is MethodCore) {
                                                ii = method_param_count;
                                                while (ii-- != 0 && parameters.FixedParameters [ii].ModFlags == pd.FixedParameters [ii].ModFlags &&
                                                        parameters.ExtensionMethodType == pd.ExtensionMethodType);

                                                if (ii >= 0) {
                                                        MethodCore mc = TypeManager.GetMethod ((MethodBase) ce.Member) as MethodCore;
                                                        Report.SymbolRelatedToPreviousError (ce.Member);
                                                        if ((member.ModFlags & Modifiers.PARTIAL) != 0 && (mc.ModFlags & Modifiers.PARTIAL) != 0) {
                                                                if (parameters.HasParams || pd.HasParams) {
                                                                        Report.Error (758, member.Location,
                                                                                "A partial method declaration and partial method implementation cannot differ on use of `params' modifier");
                                                                } else {
                                                                        Report.Error (755, member.Location,
                                                                                "A partial method declaration and partial method implementation must be both an extension method or neither");
                                                                }
                                                        } else {
                                                                if (member is Constructor) {
                                                                        Report.Error (851, member.Location,
                                                                                "Overloaded contructor `{0}' cannot differ on use of parameter modifiers only",
                                                                                member.GetSignatureForError ());
                                                                } else {
                                                                        Report.Error (663, member.Location,
                                                                                "Overloaded method `{0}' cannot differ on use of parameter modifiers only",
                                                                                member.GetSignatureForError ());
                                                                }
                                                        }
                                                        return false;
                                                }
                                        }
                                }

                                if ((ce.EntryType & EntryType.Method) != 0) {
                                        Method method_a = member as Method;
                                        Method method_b = TypeManager.GetMethod ((MethodBase) ce.Member) as Method;
                                        if (method_a != null && method_b != null && (method_a.ModFlags & method_b.ModFlags & Modifiers.PARTIAL) != 0) {
                                                const Modifiers partial_modifiers = Modifiers.STATIC | Modifiers.UNSAFE;
                                                if (method_a.IsPartialDefinition == method_b.IsPartialImplementation) {
                                                        if ((method_a.ModFlags & partial_modifiers) == (method_b.ModFlags & partial_modifiers) ||
                                                                method_a.Parent.IsUnsafe && method_b.Parent.IsUnsafe) {
                                                                if (method_a.IsPartialImplementation) {
                                                                        method_a.SetPartialDefinition (method_b);
                                                                        entries.RemoveAt (i);
                                                                } else {
                                                                        method_b.SetPartialDefinition (method_a);
                                                                        method_a.caching_flags |= MemberCore.Flags.PartialDefinitionExists;
                                                                }
                                                                continue;
                                                        }

                                                        if ((method_a.ModFlags & Modifiers.STATIC) != (method_b.ModFlags & Modifiers.STATIC)) {
                                                                Report.SymbolRelatedToPreviousError (ce.Member);
                                                                Report.Error (763, member.Location,
                                                                        "A partial method declaration and partial method implementation must be both `static' or neither");
                                                        }

                                                        Report.SymbolRelatedToPreviousError (ce.Member);
                                                        Report.Error (764, member.Location,
                                                                "A partial method declaration and partial method implementation must be both `unsafe' or neither");
                                                        return false;
                                                }

                                                Report.SymbolRelatedToPreviousError (ce.Member);
                                                if (method_a.IsPartialDefinition) {
                                                        Report.Error (756, member.Location, "A partial method `{0}' declaration is already defined",
                                                                member.GetSignatureForError ());
                                                } else {
                                                        Report.Error (757, member.Location, "A partial method `{0}' implementation is already defined",
                                                                member.GetSignatureForError ());
                                                }

                                                return false;
                                        }

                                        Report.SymbolRelatedToPreviousError (ce.Member);
                                        IMethodData duplicate_member = TypeManager.GetMethod ((MethodBase) ce.Member);
                                        if (member is Operator && duplicate_member is Operator) {
                                                Report.Error (557, member.Location, "Duplicate user-defined conversion in type `{0}'",
                                                        member.Parent.GetSignatureForError ());
                                                return false;
                                        }

                                        bool is_reserved_a = member is AbstractPropertyEventMethod || member is Operator;
                                        bool is_reserved_b = duplicate_member is AbstractPropertyEventMethod || duplicate_member is Operator;

                                        if (is_reserved_a || is_reserved_b) {
                                                Report.Error (82, member.Location, "A member `{0}' is already reserved",
                                                        is_reserved_a ?
                                                        TypeManager.GetFullNameSignature (ce.Member) :
                                                        member.GetSignatureForError ());
                                                return false;
                                        }
                                } else {
                                        Report.SymbolRelatedToPreviousError (ce.Member);
                                }
                                
                                Report.Error (111, member.Location,
                                        "A member `{0}' is already defined. Rename this member or use different parameter types",
                                        member.GetSignatureForError ());
                                return false;
                        }

                        return true;
                }
        }
}