2005-10-24 Martin Baulig <martin@ximian.com>
[mono.git] / mcs / gmcs / decl.cs
index 14664753e85a670162ab804620752698f0e07c02..fe647854fb71d8ac13d3bd75f2e60a140cf2abc3 100644 (file)
@@ -23,39 +23,86 @@ using System.Xml;
 namespace Mono.CSharp {
 
        public class MemberName {
-               public string Name;
+               public readonly string Name;
                public readonly TypeArguments TypeArguments;
 
                public readonly MemberName Left;
+               public readonly Location Location;
+
+               public static readonly MemberName Null = new MemberName ("", Location.Null);
 
-               public static readonly MemberName Null = new MemberName ("");
+               bool is_double_colon;
 
-               public MemberName (string name)
+               private MemberName (MemberName left, string name, bool is_double_colon,
+                                   TypeArguments args, Location loc)
                {
                        this.Name = name;
+                       this.Location = loc;
+                       this.is_double_colon = is_double_colon;
+                       this.TypeArguments = args;
+                       this.Left = left;
                }
 
-               public MemberName (string name, TypeArguments args)
-                       : this (name)
+               public MemberName (string name, TypeArguments args, Location loc)
+                       : this (name, loc)
                {
                        this.TypeArguments = args;
                }
 
-               public MemberName (MemberName left, string name, TypeArguments args)
-                       : this (name, args)
+               public MemberName (string name, Location loc)
+               {
+                       this.Name = name;
+                       this.Location = loc;
+               }
+
+               public MemberName (MemberName left, string name, Location loc)
+                       : this (name, loc)
                {
                        this.Left = left;
                }
 
+               public MemberName (MemberName left, string name, TypeArguments args, Location loc)
+                       : this (name, args, loc)
+               {
+                       this.Left = left;
+               }
+
+               public MemberName (string alias, string name, Location loc)
+                       : this (new MemberName (alias, loc), name, true, null, loc)
+               {
+               }
+
                public MemberName (MemberName left, MemberName right)
-                       : this (left, right.Name, right.TypeArguments)
+                       : this (left, right, left != null ? left.Location : right != null ? right.Location : Location.Null)
+               {
+               }
+
+               public MemberName (MemberName left, MemberName right, Location loc)
+                       : this (null, right.Name, false, right.TypeArguments, loc)
                {
+                       if (right.is_double_colon)
+                               throw new InternalErrorException ("Cannot append double_colon member name");
+                       this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
+               }
+
+               static readonly char [] dot_array = { '.' };
+
+               public static MemberName FromDotted (string name, Location loc)
+               {
+                       string [] elements = name.Split (dot_array);
+                       int count = elements.Length;
+                       int i = 0;
+                       MemberName n = new MemberName (elements [i++], loc);
+                       while (i < count)
+                               n = new MemberName (n, elements [i++], loc);
+                       return n;
                }
 
                public string GetName ()
                {
+                       string connect = is_double_colon ? "::" : ".";
                        if (Left != null)
-                               return Left.GetName () + "." + Name;
+                               return Left.GetName () + connect + Name;
                        else
                                return Name;
                }
@@ -74,8 +121,9 @@ namespace Mono.CSharp {
                public string GetName (bool is_generic)
                {
                        string name = is_generic ? Basename : Name;
+                       string connect = is_double_colon ? "::" : ".";
                        if (Left != null)
-                               return Left.GetName (is_generic) + "." + name;
+                               return Left.GetName (is_generic) + connect + name;
                        else
                                return name;
                }
@@ -89,12 +137,14 @@ namespace Mono.CSharp {
                        }
                }
 
-               public string GetMethodName ()
-               {
-                       if (Left != null)
-                               return Left.GetTypeName () + "." + Name;
-                       else
-                               return Name;
+               public string MethodName {
+                       get {
+                               string connect = is_double_colon ? "::" : ".";
+                               if (Left != null)
+                                       return Left.FullName + connect + Name;
+                               else
+                                       return Name;
+                       }
                }
 
                public static string MakeName (string name, TypeArguments args)
@@ -112,8 +162,9 @@ namespace Mono.CSharp {
 
                public string GetTypeName ()
                {
+                       string connect = is_double_colon ? "::" : ".";
                        if (Left != null)
-                               return Left.GetTypeName () + "." +
+                               return Left.GetTypeName () + connect +
                                        MakeName (Name, TypeArguments);
                        else
                                return MakeName (Name, TypeArguments);
@@ -142,33 +193,36 @@ namespace Mono.CSharp {
                        return true;
                }
 
-               public Expression GetTypeExpression (Location loc)
+               public Expression GetTypeExpression ()
                {
                        if (IsUnbound) {
-                               if (!CheckUnbound (loc))
+                               if (!CheckUnbound (Location))
                                        return null;
 
-                               return new UnboundTypeExpression (GetTypeName ());
+                               return new UnboundTypeExpression (this, Location);
                        }
 
-                       if (Left != null) {
-                               Expression lexpr = Left.GetTypeExpression (loc);
-
-                               return new MemberAccess (lexpr, Name, TypeArguments, loc);
-                       } else {
+                       if (Left == null) {
                                if (TypeArguments != null)
-                                       return new SimpleName (Basename, TypeArguments, loc);
+                                       return new SimpleName (Basename, TypeArguments, Location);
                                else
-                                       return new SimpleName (Name, loc);
+                                       return new SimpleName (Name, Location);
+                       }
+
+                       if (is_double_colon) {
+                               if (Left.Left != null)
+                                       throw new InternalErrorException ("The left side of a :: should be an identifier");
+                               return new QualifiedAliasMember (Left.Name, Name, Location);
                        }
+
+                       Expression lexpr = Left.GetTypeExpression ();
+                       return new MemberAccess (lexpr, Name, TypeArguments, Location);
                }
 
                public MemberName Clone ()
                {
-                       if (Left != null)
-                               return new MemberName (Left.Clone (), Name, TypeArguments);
-                       else
-                               return new MemberName (Name, TypeArguments);
+                       MemberName left_clone = Left == null ? null : Left.Clone ();
+                       return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
                }
 
                public string Basename {
@@ -180,18 +234,63 @@ namespace Mono.CSharp {
                        }
                }
 
+               public string FullName {
+                       get {
+                               if (TypeArguments != null)
+                                       return Name + "<" + TypeArguments + ">";
+                               else
+                                       return Name;
+                       }
+               }
+
                public override string ToString ()
                {
-                       string full_name;
-                       if (TypeArguments != null)
-                               full_name = Name + "<" + TypeArguments + ">";
-                       else
-                               full_name = Name;
-
+                       string connect = is_double_colon ? "::" : ".";
                        if (Left != null)
-                               return Left + "." + full_name;
+                               return Left.FullName + connect + FullName;
                        else
-                               return full_name;
+                               return FullName;
+               }
+
+               public override bool Equals (object other)
+               {
+                       return Equals (other as MemberName);
+               }
+
+               public bool Equals (MemberName other)
+               {
+                       if (this == other)
+                               return true;
+                       if (other == null || Name != other.Name)
+                               return false;
+                       if (is_double_colon != other.is_double_colon)
+                               return false;
+
+                       if ((TypeArguments != null) &&
+                           (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
+                               return false;
+
+                       if ((TypeArguments == null) && (other.TypeArguments != null))
+                               return false;
+
+                       if (Left == null)
+                               return other.Left == null;
+
+                       return Left.Equals (other.Left);
+               }
+
+               public override int GetHashCode ()
+               {
+                       int hash = Name.GetHashCode ();
+                       for (MemberName n = Left; n != null; n = n.Left)
+                               hash ^= n.Name.GetHashCode ();
+                       if (is_double_colon)
+                               hash ^= 0xbadc01d;
+
+                       if (TypeArguments != null)
+                               hash ^= TypeArguments.Count << 5;
+
+                       return hash & 0x7FFFFFFF;
                }
        }
 
@@ -203,14 +302,21 @@ namespace Mono.CSharp {
                /// <summary>
                ///   Public name
                /// </summary>
+
+               protected string cached_name;
                public string Name {
                        get {
-                               return MemberName.GetName (!(this is GenericMethod) && !(this is Method));
+                               if (cached_name == null)
+                                       cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
+                               return cached_name;
                        }
                }
 
                 // Is not readonly because of IndexerName attribute
-               public MemberName MemberName;
+               private MemberName member_name;
+               public MemberName MemberName {
+                       get { return member_name; }
+               }
 
                /// <summary>
                ///   Modifier flags that the user specified in the source code
@@ -222,7 +328,9 @@ namespace Mono.CSharp {
                /// <summary>
                ///   Location where this declaration happens
                /// </summary>
-               public readonly Location Location;
+               public Location Location {
+                       get { return member_name.Location; }
+               }
 
                /// <summary>
                ///   XML documentation comment
@@ -247,7 +355,9 @@ namespace Mono.CSharp {
                        ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
                        Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
                        Excluded = 1 << 9,                                      // Method is conditional
-                       TestMethodDuplication = 1 << 10         // Test for duplication must be performed
+                       TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
+                       IsUsed = 1 << 11,
+                       IsAssigned = 1 << 12                            // Field is assigned
                }
   
                /// <summary>
@@ -255,32 +365,21 @@ namespace Mono.CSharp {
                /// </summary>
                internal Flags caching_flags;
 
-               public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
-                                  Location loc)
+               public MemberCore (TypeContainer parent, MemberName name, Attributes attrs)
                        : base (attrs)
                {
                        if (parent is PartialContainer && !(this is PartialContainer))
                                throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 
                        Parent = parent;
-                       MemberName = name;
-                       Location = loc;
+                       member_name = name;
                        caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
                }
 
-               /// <summary>
-               /// Tests presence of ObsoleteAttribute and report proper error
-               /// </summary>
-               protected void CheckUsageOfObsoleteAttribute (Type type)
+               protected virtual void SetMemberName (MemberName new_name)
                {
-                       if (type == null)
-                               return;
-
-                       ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
-                       if (obsolete_attr == null)
-                               return;
-
-                       AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
+                       member_name = new_name;
+                       cached_name = null;
                }
 
                public abstract bool Define ();
@@ -290,15 +389,10 @@ namespace Mono.CSharp {
                //
                public virtual string GetSignatureForError ()
                {
-                       return Name;
-               }
+                       if (Parent == null || Parent.Parent == null)
+                               return Name;
 
-               /// <summary>
-               /// Use this method when MethodBuilder is null
-               /// </summary>
-               public virtual string GetSignatureForError (TypeContainer tc)
-               {
-                       return Name;
+                       return String.Concat (Parent.GetSignatureForError (), '.', Name);
                }
 
                /// <summary>
@@ -306,22 +400,36 @@ namespace Mono.CSharp {
                /// </summary>
                public virtual void Emit ()
                {
-                       // Hack with Parent == null is for EnumMember
-                       if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
-                               VerifyObsoleteAttribute ();
-
                        if (!RootContext.VerifyClsCompliance)
                                return;
 
                        VerifyClsCompliance (Parent);
                }
 
+               public virtual EmitContext EmitContext
+               {
+                       get {
+                               return Parent.EmitContext;
+                       }
+               }
+
                public bool InUnsafe {
                        get {
                                return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
                        }
                }
 
+               public virtual bool IsUsed {
+                       get {
+                               return (caching_flags & Flags.IsUsed) != 0;
+                       }
+               }
+
+               public void SetMemberIsUsed ()
+               {
+                       caching_flags |= Flags.IsUsed;
+               }
+
                // 
                // Whehter is it ok to use an unsafe pointer in this type container
                //
@@ -343,7 +451,7 @@ namespace Mono.CSharp {
                /// <summary>
                /// Returns instance of ObsoleteAttribute for this MemberCore
                /// </summary>
-               public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
+               public virtual ObsoleteAttribute GetObsoleteAttribute ()
                {
                        // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
                        if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
@@ -356,11 +464,11 @@ namespace Mono.CSharp {
                                return null;
 
                        Attribute obsolete_attr = OptAttributes.Search (
-                               TypeManager.obsolete_attribute_type, ds.EmitContext);
+                               TypeManager.obsolete_attribute_type, EmitContext);
                        if (obsolete_attr == null)
                                return null;
 
-                       ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
+                       ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (EmitContext);
                        if (obsolete == null)
                                return null;
 
@@ -368,10 +476,38 @@ namespace Mono.CSharp {
                        return obsolete;
                }
 
+               /// <summary>
+               /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
+               /// </summary>
+               public virtual void CheckObsoleteness (Location loc)
+               {
+                       if (Parent != null)
+                               Parent.CheckObsoleteness (loc);
+
+                       ObsoleteAttribute oa = GetObsoleteAttribute ();
+                       if (oa == null) {
+                               return;
+                       }
+
+                       AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
+               }
+
+               protected void CheckObsoleteType (Expression type)
+               {
+                       ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type.Type);
+                       if (obsolete_attr == null)
+                               return;
+
+                       if (GetObsoleteAttribute () != null || Parent.GetObsoleteAttribute () != null)
+                               return;
+
+                       AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (type.Type), type.Location);
+               }
+
                /// <summary>
                /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
                /// </summary>
-               public override bool IsClsCompliaceRequired (DeclSpace container)
+               public override bool IsClsComplianceRequired (DeclSpace container)
                {
                        if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
                                return (caching_flags & Flags.ClsCompliant) != 0;
@@ -444,32 +580,31 @@ namespace Mono.CSharp {
                /// </summary>
                protected virtual bool VerifyClsCompliance (DeclSpace ds)
                {
-                       if (!IsClsCompliaceRequired (ds)) {
+                       if (!IsClsComplianceRequired (ds)) {
                                if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
                                        if (!IsExposedFromAssembly (ds))
-                                               Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
+                                               Report.Warning (3019, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
                                        if (!CodeGen.Assembly.IsClsCompliant)
-                                               Report.Warning (3021, Location, "'{0}' does not need a CLSCompliant attribute because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
+                                               Report.Warning (3021, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
                                }
                                return false;
                        }
 
                        if (!CodeGen.Assembly.IsClsCompliant) {
                                if (HasClsCompliantAttribute) {
-                                       Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
+                                       Report.Error (3014, Location,
+                                               "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
+                                               GetSignatureForError ());
                                }
                                return false;
                        }
 
-                       int index = Name.LastIndexOf ('.');
-                       if (Name [index > 0 ? index + 1 : 0] == '_') {
-                               Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
+                       if (member_name.Name [0] == '_') {
+                               Report.Error (3008, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
                        }
                        return true;
                }
 
-               protected abstract void VerifyObsoleteAttribute ();
-
                //
                // Raised (and passed an XmlElement that contains the comment)
                // when GenerateDocComment is writing documentation expectedly.
@@ -508,7 +643,7 @@ namespace Mono.CSharp {
        ///   provides the common foundation for managing those name
        ///   spaces.
        /// </remarks>
-       public abstract class DeclSpace : MemberCore, IAlias {
+       public abstract class DeclSpace : MemberCore {
                /// <summary>
                ///   This points to the actual definition that is being
                ///   created with System.Reflection.Emit
@@ -531,7 +666,6 @@ namespace Mono.CSharp {
                private Hashtable Cache = new Hashtable ();
                
                public readonly string Basename;
-               public readonly string Basename_with_arity;
                
                protected Hashtable defined_names;
 
@@ -542,8 +676,10 @@ namespace Mono.CSharp {
                // The emit context for toplevel objects.
                protected EmitContext ec;
                
-               public EmitContext EmitContext {
-                       get { return ec; }
+               public override EmitContext EmitContext {
+                       get {
+                               return ec;
+                       }
                }
 
                //
@@ -563,12 +699,11 @@ namespace Mono.CSharp {
                static string[] attribute_targets = new string [] { "type" };
 
                public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
-                                 Attributes attrs, Location l)
-                       : base (parent, name, attrs, l)
+                                 Attributes attrs)
+                       : base (parent, name, attrs)
                {
                        NamespaceEntry = ns;
-                       Basename = name.Name;
-                       Basename_with_arity = name.Basename;
+                       Basename = name.Basename;
                        defined_names = new Hashtable ();
                        if (name.TypeArguments != null) {
                                is_generic = true;
@@ -581,45 +716,55 @@ namespace Mono.CSharp {
                /// <summary>
                /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
                /// </summary>
-               protected bool AddToContainer (MemberCore symbol, string fullname, string basename)
+               protected bool AddToContainer (MemberCore symbol, string name)
                {
-                       if (basename == Basename && !(this is Interface)) {
+                       if (name == MemberName.Name && !(this is Interface) && !(this is Enum)) {
                                if (symbol is TypeParameter)
-                                       Report.Error (694, "Type parameter `{0}' has same name as " +
-                                                     "containing type or method", basename);
+                                       Report.Error (694, symbol.Location,
+                                                     "Type parameter `{0}' has same name as " +
+                                                     "containing type or method", name);
                                else {
                                        Report.SymbolRelatedToPreviousError (this);
-                                       Report.Error (542, "'{0}': member names cannot be the same as their " +
-                                                     "enclosing type", symbol.Location, symbol.GetSignatureForError ());
+                                       Report.Error (542,  symbol.Location,
+                                                     "`{0}': member names cannot be the same " +
+                                                     "as their enclosing type",
+                                                     symbol.GetSignatureForError ());
+                                       return false;
                                }
-                               return false;
                        }
 
-                       MemberCore mc = (MemberCore)defined_names [fullname];
+                       MemberCore mc = (MemberCore) defined_names [name];
 
                        if (mc == null) {
-                               defined_names.Add (fullname, symbol);
+                               defined_names.Add (name, symbol);
                                return true;
                        }
 
                        if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
                                return true;
 
-                       if (symbol is TypeParameter)
-                               Report.Error (692, symbol.Location, "Duplicate type parameter `{0}'", basename);
-                       else {
-                               Report.SymbolRelatedToPreviousError (mc);
+                       Report.SymbolRelatedToPreviousError (mc);
+                       if (symbol is PartialContainer || mc is PartialContainer) {
+                               Report.Error (260, symbol.Location,
+                                       "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
+                                       name);
+                               return false;
+                       }
+
+                       if (this is RootTypes) {
+                               Report.Error (101, symbol.Location, 
+                                       "The namespace `{0}' already contains a definition for `{1}'",
+                                       ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
+                       } else if (symbol is TypeParameter) {
+                               Report.Error (692, symbol.Location,
+                                             "Duplicate type parameter `{0}'", name);
+                       } else {
                                Report.Error (102, symbol.Location,
-                                             "The type '{0}' already contains a definition for '{1}'",
-                                             GetSignatureForError (), basename);
+                                             "The type `{0}' already contains a definition for `{1}'",
+                                             GetSignatureForError (), symbol.MemberName.Name);
                        }
-                       return false;
-               }
 
-               public void RecordDecl ()
-               {
-                       if ((NamespaceEntry != null) && (Parent == RootContext.Tree.Types))
-                               NamespaceEntry.DefineName (MemberName.Basename, this);
+                       return false;
                }
 
                /// <summary>
@@ -632,35 +777,13 @@ namespace Mono.CSharp {
                        return (MemberCore)defined_names [name];
                }
 
-               bool in_transit = false;
-               
-               /// <summary>
-               ///   This function is used to catch recursive definitions
-               ///   in declarations.
-               /// </summary>
-               public bool InTransit {
-                       get {
-                               return in_transit;
-                       }
-
-                       set {
-                               in_transit = value;
-                       }
-               }
-               
                // 
                // root_types contains all the types.  All TopLevel types
                // hence have a parent that points to `root_types', that is
                // why there is a non-obvious test down here.
                //
                public bool IsTopLevel {
-                       get {
-                               if (Parent != null){
-                                       if (Parent.Parent == null)
-                                               return true;
-                               }
-                               return false;
-                       }
+                       get { return (Parent != null && Parent.Parent == null); }
                }
 
                public virtual void CloseType ()
@@ -684,6 +807,10 @@ namespace Mono.CSharp {
                        }
                }
 
+               protected virtual TypeAttributes TypeAttr {
+                       get { return CodeGen.Module.DefaultCharSetType; }
+               }
+
                /// <remarks>
                ///  Should be overriten by the appropriate declaration space
                /// </remarks>
@@ -693,7 +820,20 @@ namespace Mono.CSharp {
                ///   Define all members, but don't apply any attributes or do anything which may
                ///   access not-yet-defined classes.  This method also creates the MemberCache.
                /// </summary>
-               public abstract bool DefineMembers (TypeContainer parent);
+               public virtual bool DefineMembers (TypeContainer parent)
+               {
+                       if (((ModFlags & Modifiers.NEW) != 0) && IsTopLevel) {
+                               Report.Error (1530, Location, "Keyword `new' is not allowed on namespace elements");
+                               return false;
+                       }
+                       return true;
+               }
+
+               public override string GetSignatureForError ()
+               {       
+                       // Parent.GetSignatureForError
+                       return Name;
+               }
 
                //
                // Whether this is an `unsafe context'
@@ -729,15 +869,12 @@ namespace Mono.CSharp {
                //    Resolves the expression `e' for a type, and will recursively define
                //    types.  This should only be used for resolving base types.
                // </summary>
-               public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
+               protected TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
                {
                        TypeResolveEmitContext.loc = loc;
-                       TypeResolveEmitContext.ContainerType = TypeBuilder;
+                       TypeResolveEmitContext.ResolvingTypeTree = true;
                        if (this is GenericMethod)
                                TypeResolveEmitContext.ContainerType = Parent.TypeBuilder;
-                       else
-                               TypeResolveEmitContext.ContainerType = TypeBuilder;
-
                        return e.ResolveAsTypeTerminal (TypeResolveEmitContext);
                }
                
@@ -829,10 +966,7 @@ namespace Mono.CSharp {
                protected bool FamilyAccessible (Type tb, Type check_type)
                {
                        Type declaring = check_type.DeclaringType;
-                       if (tb == declaring || TypeManager.IsFamilyAccessible (tb, declaring))
-                               return true;
-
-                       return NestedAccessible (tb, check_type);
+                       return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
                }
 
                // Access level of a type.
@@ -936,13 +1070,6 @@ namespace Mono.CSharp {
                        return ~ (~ mAccess | pAccess) == 0;
                }
 
-               public static void Error_AmbiguousTypeReference (Location loc, string name, string t1, string t2)
-               {
-                       Report.Error (104, loc,
-                                     "`{0}' is an ambiguous reference ({1} or {2})",
-                                     name, t1, t2);
-               }
-
                //
                // Return the nested type with name @name.  Ensures that the nested type
                // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
@@ -964,6 +1091,8 @@ namespace Mono.CSharp {
                        for (Type current_type = TypeBuilder;
                             current_type != null && current_type != TypeManager.object_type;
                             current_type = current_type.BaseType) {
+                               if (current_type.IsGenericInstance)
+                                       current_type = current_type.GetGenericTypeDefinition ();
                                if (current_type is TypeBuilder) {
                                        DeclSpace decl = this;
                                        if (current_type != TypeBuilder)
@@ -981,8 +1110,7 @@ namespace Mono.CSharp {
                }
 
                //
-               // Public function used to locate types, this can only
-               // be used after the ResolveTree function has been invoked.
+               // Public function used to locate types.
                //
                // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
                //
@@ -1027,6 +1155,10 @@ namespace Mono.CSharp {
 
                public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
                {
+                       if (a.Type == TypeManager.required_attr_type) {
+                               Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
+                               return;
+                       }
                        TypeBuilder.SetCustomAttribute (cb);
                }
 
@@ -1164,6 +1296,8 @@ namespace Mono.CSharp {
                                Constraints constraints = null;
                                if (constraints_list != null) {
                                        foreach (Constraints constraint in constraints_list) {
+                                               if (constraint == null)
+                                                       continue;
                                                if (constraint.TypeParameter == name) {
                                                        constraints = constraint;
                                                        break;
@@ -1171,10 +1305,10 @@ namespace Mono.CSharp {
                                        }
                                }
 
-                               type_params [i] = new TypeParameter (Parent, name, constraints, Location);
+                               type_params [i] = new TypeParameter (
+                                       Parent, this, name, constraints, Location);
 
-                               string full_name = Name + "." + name;
-                               AddToContainer (type_params [i], full_name, name);
+                               AddToContainer (type_params [i], name);
                        }
                }
 
@@ -1230,29 +1364,38 @@ namespace Mono.CSharp {
                        return null;
                }
 
-               bool IAlias.IsType {
-                       get { return true; }
-               }
-
-               string IAlias.Name {
-                       get { return Name; }
+               public override string[] ValidAttributeTargets {
+                       get { return attribute_targets; }
                }
 
-               TypeExpr IAlias.ResolveAsType (EmitContext ec)
+               protected override bool VerifyClsCompliance (DeclSpace ds)
                {
-                       if (TypeBuilder == null)
-                               throw new InvalidOperationException ();
+                       if (!base.VerifyClsCompliance (ds)) {
+                               return false;
+                       }
 
-                       if (CurrentType != null)
-                               return new TypeExpression (CurrentType, Location);
-                       else
-                               return new TypeExpression (TypeBuilder, Location);
-               }
+                       IDictionary cache = TypeManager.AllClsTopLevelTypes;
+                       string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
+                       if (!cache.Contains (lcase)) {
+                               cache.Add (lcase, this);
+                               return true;
+                       }
 
-               public override string[] ValidAttributeTargets {
-                       get {
-                               return attribute_targets;
+                       object val = cache [lcase];
+                       if (val == null) {
+                               Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
+                               if (t == null)
+                                       return true;
+                               Report.SymbolRelatedToPreviousError (t);
                        }
+                       else {
+                               if (val is PartialContainer)
+                                       return true;
+
+                               Report.SymbolRelatedToPreviousError ((DeclSpace)val);
+                       }
+                       Report.Warning (3005, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
+                       return true;
                }
        }
 
@@ -1551,15 +1694,6 @@ namespace Mono.CSharp {
                        return hash;
                }
 
-               void ClearDeclaredOnly (Hashtable hash)
-               {
-                       IDictionaryEnumerator it = hash.GetEnumerator ();
-                       while (it.MoveNext ()) {
-                               foreach (CacheEntry ce in (ArrayList) it.Value)
-                                       ce.EntryType &= ~EntryType.Declared;
-                       }
-               }
-
                /// <summary>
                ///   Add the contents of `cache' to the member_hash.
                /// </summary>
@@ -1656,17 +1790,10 @@ namespace Mono.CSharp {
                        AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
                }
 
+               static ArrayList overrides = new ArrayList ();
+
                void AddMethods (BindingFlags bf, Type type)
                {
-                       //
-                       // Consider the case:
-                       //
-                       //   class X { public virtual int f() {} }
-                       //   class Y : X {}
-                       // 
-                       // When processing 'Y', the method_cache will already have a copy of 'f', 
-                       // with ReflectedType == X.  However, we want to ensure that its ReflectedType == Y
-                       // 
                        MethodBase [] members = type.GetMethods (bf);
 
                        Array.Reverse (members);
@@ -1681,51 +1808,24 @@ namespace Mono.CSharp {
                                        method_hash.Add (name, list);
                                }
 
-                               if (member.IsVirtual &&
-                                   (member.Attributes & MethodAttributes.NewSlot) == 0) {
-                                       MethodInfo base_method = ((MethodInfo) member).GetBaseDefinition ();
-
-                                       if (base_method == member) {
-                                               //
-                                               // Both mcs and CSC 1.1 seem to emit a somewhat broken
-                                               // ...Invoke () function for delegates: it's missing a 'newslot'.
-                                               // CSC 2.0 emits a 'newslot' for a delegate's Invoke.
-                                               //
-                                               if (member.Name != "Invoke" ||
-                                                   !TypeManager.IsDelegateType (type)) {
-                                                       Report.SymbolRelatedToPreviousError (base_method);
-                                                       Report.Warning (-28, 
-                                                               "{0} contains a method '{1}' that is marked " + 
-                                                               " virtual, but doesn't appear to have a slot." + 
-                                                               "  The method may be ignored during overload resolution", 
-                                                               type, base_method);
-                                               }
-                                               goto skip;
-                                       }
-
-                                       for (;;) {
-                                               list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
-                                               if ((base_method.Attributes & MethodAttributes.NewSlot) != 0)
-                                                       break;
+                               MethodInfo curr = (MethodInfo) member;
+                               while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
+                                       MethodInfo base_method = curr.GetBaseDefinition ();
 
-                                               //
-                                               // Shouldn't get here.  Mono appears to be buggy.
-                                               //
-                                               MethodInfo new_base_method = base_method.GetBaseDefinition ();
-                                               if (new_base_method == base_method) {
-                                                       Report.SymbolRelatedToPreviousError (base_method);
-                                                       Report.Warning (-28, 
-                                                               "{0} contains a method '{1}' that is marked " + 
-                                                               " virtual, but doesn't appear to have a slot." + 
-                                                               "  The method may be ignored during overload resolution", 
-                                                               type, base_method);
-                                               }
-                                               base_method = new_base_method;
-                                       }
+                                       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 ();
                                }
-                       skip:
 
                                // Unfortunately, the elements returned by Type.GetMethods() aren't
                                // sorted so we need to do this check for every member.
@@ -2010,7 +2110,7 @@ namespace Mono.CSharp {
                // Because the MemberCache holds members from this class and all the base classes,
                // we can avoid tons of reflection stuff.
                //
-               public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
+               public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, GenericMethod genericMethod, bool is_property)
                {
                        ArrayList applicable;
                        if (method_hash != null && !is_property)
@@ -2086,7 +2186,20 @@ namespace Mono.CSharp {
                                        if (!TypeManager.IsEqual (paramTypes [j], cmpAttrs [j]))
                                                goto next;
                                }
-                               
+
+                               //
+                               // check generic arguments for methods
+                               //
+                               if (mi != null) {
+                                       Type [] cmpGenArgs = mi.GetGenericArguments ();
+                                       if (genericMethod != null && cmpGenArgs.Length > 0) {
+                                               if (genericMethod.TypeParameters.Length != cmpGenArgs.Length)
+                                                       goto next;
+                                       }
+                                       else if (! (genericMethod == null && cmpGenArgs.Length == 0))
+                                               goto next;
+                               }
+
                                //
                                // get one of the methods because this has the visibility info.
                                //
@@ -2259,18 +2372,30 @@ namespace Mono.CSharp {
                                        continue;
                
                                MethodBase method_to_compare = (MethodBase)entry.Member;
-                               if (AttributeTester.AreOverloadedMethodParamsClsCompliant (method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare)))
+                               AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
+                                       method.ParameterTypes, TypeManager.GetArgumentTypes (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.IsClsCompliaceRequired (method.Parent))
+                               if (md != null && !md.IsClsComplianceRequired (method.Parent))
                                        continue;
                
                                Report.SymbolRelatedToPreviousError (entry.Member);
-                               Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
+                               switch (result) {
+                                       case AttributeTester.Result.RefOutArrayError:
+                                               Report.Error (3006, 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.Error (3007, method.Location, "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
+                                               continue;
+                               }
+
+                               throw new NotImplementedException (result.ToString ());
                        }
                }
        }